+++ /dev/null
-What: /debug/aufs/si_<id>/
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- Under /debug/aufs, a directory named si_<id> is created
- per aufs mount, where <id> is a unique id generated
- internally.
-
-What: /debug/aufs/si_<id>/plink
-Date: Apr 2013
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It has three lines and shows the information about the
- pseudo-link. The first line is a single number
- representing a number of buckets. The second line is a
- number of pseudo-links per buckets (separated by a
- blank). The last line is a single number representing a
- total number of psedo-links.
- When the aufs mount option 'noplink' is specified, it
- will show "1\n0\n0\n".
-
-What: /debug/aufs/si_<id>/xib
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the consumed blocks by xib (External Inode Number
- Bitmap), its block size and file size.
- When the aufs mount option 'noxino' is specified, it
- will be empty. About XINO files, see the aufs manual.
-
-What: /debug/aufs/si_<id>/xino0, xino1 ... xinoN
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the consumed blocks by xino (External Inode Number
- Translation Table), its link count, block size and file
- size.
- When the aufs mount option 'noxino' is specified, it
- will be empty. About XINO files, see the aufs manual.
-
-What: /debug/aufs/si_<id>/xigen
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the consumed blocks by xigen (External Inode
- Generation Table), its block size and file size.
- If CONFIG_AUFS_EXPORT is disabled, this entry will not
- be created.
- When the aufs mount option 'noxino' is specified, it
- will be empty. About XINO files, see the aufs manual.
+++ /dev/null
-What: /sys/fs/aufs/si_<id>/
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- Under /sys/fs/aufs, a directory named si_<id> is created
- per aufs mount, where <id> is a unique id generated
- internally.
-
-What: /sys/fs/aufs/si_<id>/br0, br1 ... brN
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the abolute path of a member directory (which
- is called branch) in aufs, and its permission.
-
-What: /sys/fs/aufs/si_<id>/brid0, brid1 ... bridN
-Date: July 2013
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the id of a member directory (which is called
- branch) in aufs.
-
-What: /sys/fs/aufs/si_<id>/xi_path
-Date: March 2009
-Contact: J. R. Okajima <hooanon05g@gmail.com>
-Description:
- It shows the abolute path of XINO (External Inode Number
- Bitmap, Translation Table and Generation Table) file
- even if it is the default path.
- When the aufs mount option 'noxino' is specified, it
- will be empty. About XINO files, see the aufs manual.
+++ /dev/null
-
-Aufs4 -- advanced multi layered unification filesystem version 4.x
-http://aufs.sf.net
-Junjiro R. Okajima
-
-
-0. Introduction
-----------------------------------------
-In the early days, aufs was entirely re-designed and re-implemented
-Unionfs Version 1.x series. Adding many original ideas, approaches,
-improvements and implementations, it becomes totally different from
-Unionfs while keeping the basic features.
-Recently, Unionfs Version 2.x series begin taking some of the same
-approaches to aufs1's.
-Unionfs is being developed by Professor Erez Zadok at Stony Brook
-University and his team.
-
-Aufs4 supports linux-4.0 and later, and for linux-3.x series try aufs3.
-If you want older kernel version support, try aufs2-2.6.git or
-aufs2-standalone.git repository, aufs1 from CVS on SourceForge.
-
-Note: it becomes clear that "Aufs was rejected. Let's give it up."
- According to Christoph Hellwig, linux rejects all union-type
- filesystems but UnionMount.
-<http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
-
-PS. Al Viro seems have a plan to merge aufs as well as overlayfs and
- UnionMount, and he pointed out an issue around a directory mutex
- lock and aufs addressed it. But it is still unsure whether aufs will
- be merged (or any other union solution).
-<http://marc.info/?l=linux-kernel&m=136312705029295&w=1>
-
-
-1. Features
-----------------------------------------
-- unite several directories into a single virtual filesystem. The member
- directory is called as a branch.
-- you can specify the permission flags to the branch, which are 'readonly',
- 'readwrite' and 'whiteout-able.'
-- by upper writable branch, internal copyup and whiteout, files/dirs on
- readonly branch are modifiable logically.
-- dynamic branch manipulation, add, del.
-- etc...
-
-Also there are many enhancements in aufs, such as:
-- test only the highest one for the directory permission (dirperm1)
-- copyup on open (coo=)
-- 'move' policy for copy-up between two writable branches, after
- checking free space.
-- xattr, acl
-- readdir(3) in userspace.
-- keep inode number by external inode number table
-- keep the timestamps of file/dir in internal copyup operation
-- seekable directory, supporting NFS readdir.
-- whiteout is hardlinked in order to reduce the consumption of inodes
- on branch
-- do not copyup, nor create a whiteout when it is unnecessary
-- revert a single systemcall when an error occurs in aufs
-- remount interface instead of ioctl
-- maintain /etc/mtab by an external command, /sbin/mount.aufs.
-- loopback mounted filesystem as a branch
-- kernel thread for removing the dir who has a plenty of whiteouts
-- support copyup sparse file (a file which has a 'hole' in it)
-- default permission flags for branches
-- selectable permission flags for ro branch, whether whiteout can
- exist or not
-- export via NFS.
-- support <sysfs>/fs/aufs and <debugfs>/aufs.
-- support multiple writable branches, some policies to select one
- among multiple writable branches.
-- a new semantics for link(2) and rename(2) to support multiple
- writable branches.
-- no glibc changes are required.
-- pseudo hardlink (hardlink over branches)
-- allow a direct access manually to a file on branch, e.g. bypassing aufs.
- including NFS or remote filesystem branch.
-- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX.
-- and more...
-
-Currently these features are dropped temporary from aufs4.
-See design/08plan.txt in detail.
-- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs
- (robr)
-- statistics of aufs thread (/sys/fs/aufs/stat)
-
-Features or just an idea in the future (see also design/*.txt),
-- reorder the branch index without del/re-add.
-- permanent xino files for NFSD
-- an option for refreshing the opened files after add/del branches
-- light version, without branch manipulation. (unnecessary?)
-- copyup in userspace
-- inotify in userspace
-- readv/writev
-
-
-2. Download
-----------------------------------------
-There are three GIT trees for aufs4, aufs4-linux.git,
-aufs4-standalone.git, and aufs-util.git. Note that there is no "4" in
-"aufs-util.git."
-While the aufs-util is always necessary, you need either of aufs4-linux
-or aufs4-standalone.
-
-The aufs4-linux tree includes the whole linux mainline GIT tree,
-git://git.kernel.org/.../torvalds/linux.git.
-And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot
-build aufs4 as an external kernel module.
-Several extra patches are not included in this tree. Only
-aufs4-standalone tree contains them. They are described in the later
-section "Configuration and Compilation."
-
-On the other hand, the aufs4-standalone tree has only aufs source files
-and necessary patches, and you can select CONFIG_AUFS_FS=m.
-But you need to apply all aufs patches manually.
-
-You will find GIT branches whose name is in form of "aufs4.x" where "x"
-represents the linux kernel version, "linux-4.x". For instance,
-"aufs4.0" is for linux-4.0. For latest "linux-4.x-rcN", use
-"aufs4.x-rcN" branch.
-
-o aufs4-linux tree
-$ git clone --reference /your/linux/git/tree \
- git://github.com/sfjro/aufs4-linux.git aufs4-linux.git
-- if you don't have linux GIT tree, then remove "--reference ..."
-$ cd aufs4-linux.git
-$ git checkout origin/aufs4.0
-
-Or You may want to directly git-pull aufs into your linux GIT tree, and
-leave the patch-work to GIT.
-$ cd /your/linux/git/tree
-$ git remote add aufs4 git://github.com/sfjro/aufs4-linux.git
-$ git fetch aufs4
-$ git checkout -b my4.0 v4.0
-$ (add your local change...)
-$ git pull aufs4 aufs4.0
-- now you have v4.0 + your_changes + aufs4.0 in you my4.0 branch.
-- you may need to solve some conflicts between your_changes and
- aufs4.0. in this case, git-rerere is recommended so that you can
- solve the similar conflicts automatically when you upgrade to 4.1 or
- later in the future.
-
-o aufs4-standalone tree
-$ git clone git://github.com/sfjro/aufs4-standalone.git aufs4-standalone.git
-$ cd aufs4-standalone.git
-$ git checkout origin/aufs4.0
-
-o aufs-util tree
-$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git
-- note that the public aufs-util.git is on SourceForge instead of
- GitHUB.
-$ cd aufs-util.git
-$ git checkout origin/aufs4.0
-
-Note: The 4.x-rcN branch is to be used with `rc' kernel versions ONLY.
-The minor version number, 'x' in '4.x', of aufs may not always
-follow the minor version number of the kernel.
-Because changes in the kernel that cause the use of a new
-minor version number do not always require changes to aufs-util.
-
-Since aufs-util has its own minor version number, you may not be
-able to find a GIT branch in aufs-util for your kernel's
-exact minor version number.
-In this case, you should git-checkout the branch for the
-nearest lower number.
-
-For (an unreleased) example:
-If you are using "linux-4.10" and the "aufs4.10" branch
-does not exist in aufs-util repository, then "aufs4.9", "aufs4.8"
-or something numerically smaller is the branch for your kernel.
-
-Also you can view all branches by
- $ git branch -a
-
-
-3. Configuration and Compilation
-----------------------------------------
-Make sure you have git-checkout'ed the correct branch.
-
-For aufs4-linux tree,
-- enable CONFIG_AUFS_FS.
-- set other aufs configurations if necessary.
-
-For aufs4-standalone tree,
-There are several ways to build.
-
-1.
-- apply ./aufs4-kbuild.patch to your kernel source files.
-- apply ./aufs4-base.patch too.
-- apply ./aufs4-mmap.patch too.
-- apply ./aufs4-standalone.patch too, if you have a plan to set
- CONFIG_AUFS_FS=m. otherwise you don't need ./aufs4-standalone.patch.
-- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your
- kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild.
-- enable CONFIG_AUFS_FS, you can select either
- =m or =y.
-- and build your kernel as usual.
-- install the built kernel.
- Note: Since linux-3.9, every filesystem module requires an alias
- "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
- modules.aliases file if you set CONFIG_AUFS_FS=m.
-- install the header files too by "make headers_install" to the
- directory where you specify. By default, it is $PWD/usr.
- "make help" shows a brief note for headers_install.
-- and reboot your system.
-
-2.
-- module only (CONFIG_AUFS_FS=m).
-- apply ./aufs4-base.patch to your kernel source files.
-- apply ./aufs4-mmap.patch too.
-- apply ./aufs4-standalone.patch too.
-- build your kernel, don't forget "make headers_install", and reboot.
-- edit ./config.mk and set other aufs configurations if necessary.
- Note: You should read $PWD/fs/aufs/Kconfig carefully which describes
- every aufs configurations.
-- build the module by simple "make".
- Note: Since linux-3.9, every filesystem module requires an alias
- "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
- modules.aliases file.
-- you can specify ${KDIR} make variable which points to your kernel
- source tree.
-- install the files
- + run "make install" to install the aufs module, or copy the built
- $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply).
- + run "make install_headers" (instead of headers_install) to install
- the modified aufs header file (you can specify DESTDIR which is
- available in aufs standalone version's Makefile only), or copy
- $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever
- you like manually. By default, the target directory is $PWD/usr.
-- no need to apply aufs4-kbuild.patch, nor copying source files to your
- kernel source tree.
-
-Note: The header file aufs_type.h is necessary to build aufs-util
- as well as "make headers_install" in the kernel source tree.
- headers_install is subject to be forgotten, but it is essentially
- necessary, not only for building aufs-util.
- You may not meet problems without headers_install in some older
- version though.
-
-And then,
-- read README in aufs-util, build and install it
-- note that your distribution may contain an obsoleted version of
- aufs_type.h in /usr/include/linux or something. When you build aufs
- utilities, make sure that your compiler refers the correct aufs header
- file which is built by "make headers_install."
-- if you want to use readdir(3) in userspace or pathconf(3) wrapper,
- then run "make install_ulib" too. And refer to the aufs manual in
- detail.
-
-There several other patches in aufs4-standalone.git. They are all
-optional. When you meet some problems, they will help you.
-- aufs4-loopback.patch
- Supports a nested loopback mount in a branch-fs. This patch is
- unnecessary until aufs produces a message like "you may want to try
- another patch for loopback file".
-- vfs-ino.patch
- Modifies a system global kernel internal function get_next_ino() in
- order to stop assigning 0 for an inode-number. Not directly related to
- aufs, but recommended generally.
-- tmpfs-idr.patch
- Keeps the tmpfs inode number as the lowest value. Effective to reduce
- the size of aufs XINO files for tmpfs branch. Also it prevents the
- duplication of inode number, which is important for backup tools and
- other utilities. When you find aufs XINO files for tmpfs branch
- growing too much, try this patch.
-- lockdep-debug.patch
- Because aufs is not only an ordinary filesystem (callee of VFS), but
- also a caller of VFS functions for branch filesystems, subclassing of
- the internal locks for LOCKDEP is necessary. LOCKDEP is a debugging
- feature of linux kernel. If you enable CONFIG_LOCKDEP, then you will
- need to apply this debug patch to expand several constant values.
- If don't know what LOCKDEP, then you don't have apply this patch.
-
-
-4. Usage
-----------------------------------------
-At first, make sure aufs-util are installed, and please read the aufs
-manual, aufs.5 in aufs-util.git tree.
-$ man -l aufs.5
-
-And then,
-$ mkdir /tmp/rw /tmp/aufs
-# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs
-
-Here is another example. The result is equivalent.
-# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs
- Or
-# mount -t aufs -o br:/tmp/rw none /tmp/aufs
-# mount -o remount,append:${HOME} /tmp/aufs
-
-Then, you can see whole tree of your home dir through /tmp/aufs. If
-you modify a file under /tmp/aufs, the one on your home directory is
-not affected, instead the same named file will be newly created under
-/tmp/rw. And all of your modification to a file will be applied to
-the one under /tmp/rw. This is called the file based Copy on Write
-(COW) method.
-Aufs mount options are described in aufs.5.
-If you run chroot or something and make your aufs as a root directory,
-then you need to customize the shutdown script. See the aufs manual in
-detail.
-
-Additionally, there are some sample usages of aufs which are a
-diskless system with network booting, and LiveCD over NFS.
-See sample dir in CVS tree on SourceForge.
-
-
-5. Contact
-----------------------------------------
-When you have any problems or strange behaviour in aufs, please let me
-know with:
-- /proc/mounts (instead of the output of mount(8))
-- /sys/module/aufs/*
-- /sys/fs/aufs/* (if you have them)
-- /debug/aufs/* (if you have them)
-- linux kernel version
- if your kernel is not plain, for example modified by distributor,
- the url where i can download its source is necessary too.
-- aufs version which was printed at loading the module or booting the
- system, instead of the date you downloaded.
-- configuration (define/undefine CONFIG_AUFS_xxx)
-- kernel configuration or /proc/config.gz (if you have it)
-- behaviour which you think to be incorrect
-- actual operation, reproducible one is better
-- mailto: aufs-users at lists.sourceforge.net
-
-Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches,
-and Feature Requests) on SourceForge. Please join and write to
-aufs-users ML.
-
-
-6. Acknowledgements
-----------------------------------------
-Thanks to everyone who have tried and are using aufs, whoever
-have reported a bug or any feedback.
-
-Especially donators:
-Tomas Matejicek(slax.org) made a donation (much more than once).
- Since Apr 2010, Tomas M (the author of Slax and Linux Live
- scripts) is making "doubling" donations.
- Unfortunately I cannot list all of the donators, but I really
- appreciate.
- It ends Aug 2010, but the ordinary donation URL is still available.
- <http://sourceforge.net/donate/index.php?group_id=167503>
-Dai Itasaka made a donation (2007/8).
-Chuck Smith made a donation (2008/4, 10 and 12).
-Henk Schoneveld made a donation (2008/9).
-Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10).
-Francois Dupoux made a donation (2008/11).
-Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public
- aufs2 GIT tree (2009/2).
-William Grant made a donation (2009/3).
-Patrick Lane made a donation (2009/4).
-The Mail Archive (mail-archive.com) made donations (2009/5).
-Nippy Networks (Ed Wildgoose) made a donation (2009/7).
-New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11).
-Pavel Pronskiy made a donation (2011/2).
-Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy
- Networks (Ed Wildgoose) made a donation for hardware (2011/3).
-Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and
-11).
-Sam Liddicott made a donation (2011/9).
-Era Scarecrow made a donation (2013/4).
-Bor Ratajc made a donation (2013/4).
-Alessandro Gorreta made a donation (2013/4).
-POIRETTE Marc made a donation (2013/4).
-Alessandro Gorreta made a donation (2013/4).
-lauri kasvandik made a donation (2013/5).
-"pemasu from Finland" made a donation (2013/7).
-The Parted Magic Project made a donation (2013/9 and 11).
-Pavel Barta made a donation (2013/10).
-Nikolay Pertsev made a donation (2014/5).
-James B made a donation (2014/7 and 2015/7).
-Stefano Di Biase made a donation (2014/8).
-Daniel Epellei made a donation (2015/1).
-OmegaPhil made a donation (2016/1).
-Tomasz Szewczyk made a donation (2016/4).
-
-Thank you very much.
-Donations are always, including future donations, very important and
-helpful for me to keep on developing aufs.
-
-
-7.
-----------------------------------------
-If you are an experienced user, no explanation is needed. Aufs is
-just a linux filesystem.
-
-
-Enjoy!
-
-# Local variables: ;
-# mode: text;
-# End: ;
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Introduction
-----------------------------------------
-
-aufs [ei ju: ef es] | [a u f s]
-1. abbrev. for "advanced multi-layered unification filesystem".
-2. abbrev. for "another unionfs".
-3. abbrev. for "auf das" in German which means "on the" in English.
- Ex. "Butter aufs Brot"(G) means "butter onto bread"(E).
- But "Filesystem aufs Filesystem" is hard to understand.
-
-AUFS is a filesystem with features:
-- multi layered stackable unification filesystem, the member directory
- is called as a branch.
-- branch permission and attribute, 'readonly', 'real-readonly',
- 'readwrite', 'whiteout-able', 'link-able whiteout', etc. and their
- combination.
-- internal "file copy-on-write".
-- logical deletion, whiteout.
-- dynamic branch manipulation, adding, deleting and changing permission.
-- allow bypassing aufs, user's direct branch access.
-- external inode number translation table and bitmap which maintains the
- persistent aufs inode number.
-- seekable directory, including NFS readdir.
-- file mapping, mmap and sharing pages.
-- pseudo-link, hardlink over branches.
-- loopback mounted filesystem as a branch.
-- several policies to select one among multiple writable branches.
-- revert a single systemcall when an error occurs in aufs.
-- and more...
-
-
-Multi Layered Stackable Unification Filesystem
-----------------------------------------------------------------------
-Most people already knows what it is.
-It is a filesystem which unifies several directories and provides a
-merged single directory. When users access a file, the access will be
-passed/re-directed/converted (sorry, I am not sure which English word is
-correct) to the real file on the member filesystem. The member
-filesystem is called 'lower filesystem' or 'branch' and has a mode
-'readonly' and 'readwrite.' And the deletion for a file on the lower
-readonly branch is handled by creating 'whiteout' on the upper writable
-branch.
-
-On LKML, there have been discussions about UnionMount (Jan Blunck,
-Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took
-different approaches to implement the merged-view.
-The former tries putting it into VFS, and the latter implements as a
-separate filesystem.
-(If I misunderstand about these implementations, please let me know and
-I shall correct it. Because it is a long time ago when I read their
-source files last time).
-
-UnionMount's approach will be able to small, but may be hard to share
-branches between several UnionMount since the whiteout in it is
-implemented in the inode on branch filesystem and always
-shared. According to Bharata's post, readdir does not seems to be
-finished yet.
-There are several missing features known in this implementations such as
-- for users, the inode number may change silently. eg. copy-up.
-- link(2) may break by copy-up.
-- read(2) may get an obsoleted filedata (fstat(2) too).
-- fcntl(F_SETLK) may be broken by copy-up.
-- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after
- open(O_RDWR).
-
-In linux-3.18, "overlay" filesystem (formerly known as "overlayfs") was
-merged into mainline. This is another implementation of UnionMount as a
-separated filesystem. All the limitations and known problems which
-UnionMount are equally inherited to "overlay" filesystem.
-
-Unionfs has a longer history. When I started implementing a stackable
-filesystem (Aug 2005), it already existed. It has virtual super_block,
-inode, dentry and file objects and they have an array pointing lower
-same kind objects. After contributing many patches for Unionfs, I
-re-started my project AUFS (Jun 2006).
-
-In AUFS, the structure of filesystem resembles to Unionfs, but I
-implemented my own ideas, approaches and enhancements and it became
-totally different one.
-
-Comparing DM snapshot and fs based implementation
-- the number of bytes to be copied between devices is much smaller.
-- the type of filesystem must be one and only.
-- the fs must be writable, no readonly fs, even for the lower original
- device. so the compression fs will not be usable. but if we use
- loopback mount, we may address this issue.
- for instance,
- mount /cdrom/squashfs.img /sq
- losetup /sq/ext2.img
- losetup /somewhere/cow
- dmsetup "snapshot /dev/loop0 /dev/loop1 ..."
-- it will be difficult (or needs more operations) to extract the
- difference between the original device and COW.
-- DM snapshot-merge may help a lot when users try merging. in the
- fs-layer union, users will use rsync(1).
-
-You may want to read my old paper "Filesystems in LiveCD"
-(http://aufs.sourceforge.net/aufs2/report/sq/sq.pdf).
-
-
-Several characters/aspects/persona of aufs
-----------------------------------------------------------------------
-
-Aufs has several characters, aspects or persona.
-1. a filesystem, callee of VFS helper
-2. sub-VFS, caller of VFS helper for branches
-3. a virtual filesystem which maintains persistent inode number
-4. reader/writer of files on branches such like an application
-
-1. Callee of VFS Helper
-As an ordinary linux filesystem, aufs is a callee of VFS. For instance,
-unlink(2) from an application reaches sys_unlink() kernel function and
-then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it
-calls filesystem specific unlink operation. Actually aufs implements the
-unlink operation but it behaves like a redirector.
-
-2. Caller of VFS Helper for Branches
-aufs_unlink() passes the unlink request to the branch filesystem as if
-it were called from VFS. So the called unlink operation of the branch
-filesystem acts as usual. As a caller of VFS helper, aufs should handle
-every necessary pre/post operation for the branch filesystem.
-- acquire the lock for the parent dir on a branch
-- lookup in a branch
-- revalidate dentry on a branch
-- mnt_want_write() for a branch
-- vfs_unlink() for a branch
-- mnt_drop_write() for a branch
-- release the lock on a branch
-
-3. Persistent Inode Number
-One of the most important issue for a filesystem is to maintain inode
-numbers. This is particularly important to support exporting a
-filesystem via NFS. Aufs is a virtual filesystem which doesn't have a
-backend block device for its own. But some storage is necessary to
-keep and maintain the inode numbers. It may be a large space and may not
-suit to keep in memory. Aufs rents some space from its first writable
-branch filesystem (by default) and creates file(s) on it. These files
-are created by aufs internally and removed soon (currently) keeping
-opened.
-Note: Because these files are removed, they are totally gone after
- unmounting aufs. It means the inode numbers are not persistent
- across unmount or reboot. I have a plan to make them really
- persistent which will be important for aufs on NFS server.
-
-4. Read/Write Files Internally (copy-on-write)
-Because a branch can be readonly, when you write a file on it, aufs will
-"copy-up" it to the upper writable branch internally. And then write the
-originally requested thing to the file. Generally kernel doesn't
-open/read/write file actively. In aufs, even a single write may cause a
-internal "file copy". This behaviour is very similar to cp(1) command.
-
-Some people may think it is better to pass such work to user space
-helper, instead of doing in kernel space. Actually I am still thinking
-about it. But currently I have implemented it in kernel space.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Basic Aufs Internal Structure
-
-Superblock/Inode/Dentry/File Objects
-----------------------------------------------------------------------
-As like an ordinary filesystem, aufs has its own
-superblock/inode/dentry/file objects. All these objects have a
-dynamically allocated array and store the same kind of pointers to the
-lower filesystem, branch.
-For example, when you build a union with one readwrite branch and one
-readonly, mounted /au, /rw and /ro respectively.
-- /au = /rw + /ro
-- /ro/fileA exists but /rw/fileA
-
-Aufs lookup operation finds /ro/fileA and gets dentry for that. These
-pointers are stored in a aufs dentry. The array in aufs dentry will be,
-- [0] = NULL (because /rw/fileA doesn't exist)
-- [1] = /ro/fileA
-
-This style of an array is essentially same to the aufs
-superblock/inode/dentry/file objects.
-
-Because aufs supports manipulating branches, ie. add/delete/change
-branches dynamically, these objects has its own generation. When
-branches are changed, the generation in aufs superblock is
-incremented. And a generation in other object are compared when it is
-accessed. When a generation in other objects are obsoleted, aufs
-refreshes the internal array.
-
-
-Superblock
-----------------------------------------------------------------------
-Additionally aufs superblock has some data for policies to select one
-among multiple writable branches, XIB files, pseudo-links and kobject.
-See below in detail.
-About the policies which supports copy-down a directory, see
-wbr_policy.txt too.
-
-
-Branch and XINO(External Inode Number Translation Table)
-----------------------------------------------------------------------
-Every branch has its own xino (external inode number translation table)
-file. The xino file is created and unlinked by aufs internally. When two
-members of a union exist on the same filesystem, they share the single
-xino file.
-The struct of a xino file is simple, just a sequence of aufs inode
-numbers which is indexed by the lower inode number.
-In the above sample, assume the inode number of /ro/fileA is i111 and
-aufs assigns the inode number i999 for fileA. Then aufs writes 999 as
-4(8) bytes at 111 * 4(8) bytes offset in the xino file.
-
-When the inode numbers are not contiguous, the xino file will be sparse
-which has a hole in it and doesn't consume as much disk space as it
-might appear. If your branch filesystem consumes disk space for such
-holes, then you should specify 'xino=' option at mounting aufs.
-
-Aufs has a mount option to free the disk blocks for such holes in XINO
-files on tmpfs or ramdisk. But it is not so effective actually. If you
-meet a problem of disk shortage due to XINO files, then you should try
-"tmpfs-ino.patch" (and "vfs-ino.patch" too) in aufs4-standalone.git.
-The patch localizes the assignment inumbers per tmpfs-mount and avoid
-the holes in XINO files.
-
-Also a writable branch has three kinds of "whiteout bases". All these
-are existed when the branch is joined to aufs, and their names are
-whiteout-ed doubly, so that users will never see their names in aufs
-hierarchy.
-1. a regular file which will be hardlinked to all whiteouts.
-2. a directory to store a pseudo-link.
-3. a directory to store an "orphan"-ed file temporary.
-
-1. Whiteout Base
- When you remove a file on a readonly branch, aufs handles it as a
- logical deletion and creates a whiteout on the upper writable branch
- as a hardlink of this file in order not to consume inode on the
- writable branch.
-2. Pseudo-link Dir
- See below, Pseudo-link.
-3. Step-Parent Dir
- When "fileC" exists on the lower readonly branch only and it is
- opened and removed with its parent dir, and then user writes
- something into it, then aufs copies-up fileC to this
- directory. Because there is no other dir to store fileC. After
- creating a file under this dir, the file is unlinked.
-
-Because aufs supports manipulating branches, ie. add/delete/change
-dynamically, a branch has its own id. When the branch order changes,
-aufs finds the new index by searching the branch id.
-
-
-Pseudo-link
-----------------------------------------------------------------------
-Assume "fileA" exists on the lower readonly branch only and it is
-hardlinked to "fileB" on the branch. When you write something to fileA,
-aufs copies-up it to the upper writable branch. Additionally aufs
-creates a hardlink under the Pseudo-link Directory of the writable
-branch. The inode of a pseudo-link is kept in aufs super_block as a
-simple list. If fileB is read after unlinking fileA, aufs returns
-filedata from the pseudo-link instead of the lower readonly
-branch. Because the pseudo-link is based upon the inode, to keep the
-inode number by xino (see above) is essentially necessary.
-
-All the hardlinks under the Pseudo-link Directory of the writable branch
-should be restored in a proper location later. Aufs provides a utility
-to do this. The userspace helpers executed at remounting and unmounting
-aufs by default.
-During this utility is running, it puts aufs into the pseudo-link
-maintenance mode. In this mode, only the process which began the
-maintenance mode (and its child processes) is allowed to operate in
-aufs. Some other processes which are not related to the pseudo-link will
-be allowed to run too, but the rest have to return an error or wait
-until the maintenance mode ends. If a process already acquires an inode
-mutex (in VFS), it has to return an error.
-
-
-XIB(external inode number bitmap)
-----------------------------------------------------------------------
-Addition to the xino file per a branch, aufs has an external inode number
-bitmap in a superblock object. It is also an internal file such like a
-xino file.
-It is a simple bitmap to mark whether the aufs inode number is in-use or
-not.
-To reduce the file I/O, aufs prepares a single memory page to cache xib.
-
-As well as XINO files, aufs has a feature to truncate/refresh XIB to
-reduce the number of consumed disk blocks for these files.
-
-
-Virtual or Vertical Dir, and Readdir in Userspace
-----------------------------------------------------------------------
-In order to support multiple layers (branches), aufs readdir operation
-constructs a virtual dir block on memory. For readdir, aufs calls
-vfs_readdir() internally for each dir on branches, merges their entries
-with eliminating the whiteout-ed ones, and sets it to file (dir)
-object. So the file object has its entry list until it is closed. The
-entry list will be updated when the file position is zero and becomes
-obsoleted. This decision is made in aufs automatically.
-
-The dynamically allocated memory block for the name of entries has a
-unit of 512 bytes (by default) and stores the names contiguously (no
-padding). Another block for each entry is handled by kmem_cache too.
-During building dir blocks, aufs creates hash list and judging whether
-the entry is whiteouted by its upper branch or already listed.
-The merged result is cached in the corresponding inode object and
-maintained by a customizable life-time option.
-
-Some people may call it can be a security hole or invite DoS attack
-since the opened and once readdir-ed dir (file object) holds its entry
-list and becomes a pressure for system memory. But I'd say it is similar
-to files under /proc or /sys. The virtual files in them also holds a
-memory page (generally) while they are opened. When an idea to reduce
-memory for them is introduced, it will be applied to aufs too.
-For those who really hate this situation, I've developed readdir(3)
-library which operates this merging in userspace. You just need to set
-LD_PRELOAD environment variable, and aufs will not consume no memory in
-kernel space for readdir(3).
-
-
-Workqueue
-----------------------------------------------------------------------
-Aufs sometimes requires privilege access to a branch. For instance,
-in copy-up/down operation. When a user process is going to make changes
-to a file which exists in the lower readonly branch only, and the mode
-of one of ancestor directories may not be writable by a user
-process. Here aufs copy-up the file with its ancestors and they may
-require privilege to set its owner/group/mode/etc.
-This is a typical case of a application character of aufs (see
-Introduction).
-
-Aufs uses workqueue synchronously for this case. It creates its own
-workqueue. The workqueue is a kernel thread and has privilege. Aufs
-passes the request to call mkdir or write (for example), and wait for
-its completion. This approach solves a problem of a signal handler
-simply.
-If aufs didn't adopt the workqueue and changed the privilege of the
-process, then the process may receive the unexpected SIGXFSZ or other
-signals.
-
-Also aufs uses the system global workqueue ("events" kernel thread) too
-for asynchronous tasks, such like handling inotify/fsnotify, re-creating a
-whiteout base and etc. This is unrelated to a privilege.
-Most of aufs operation tries acquiring a rw_semaphore for aufs
-superblock at the beginning, at the same time waits for the completion
-of all queued asynchronous tasks.
-
-
-Whiteout
-----------------------------------------------------------------------
-The whiteout in aufs is very similar to Unionfs's. That is represented
-by its filename. UnionMount takes an approach of a file mode, but I am
-afraid several utilities (find(1) or something) will have to support it.
-
-Basically the whiteout represents "logical deletion" which stops aufs to
-lookup further, but also it represents "dir is opaque" which also stop
-further lookup.
-
-In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively.
-In order to make several functions in a single systemcall to be
-revertible, aufs adopts an approach to rename a directory to a temporary
-unique whiteouted name.
-For example, in rename(2) dir where the target dir already existed, aufs
-renames the target dir to a temporary unique whiteouted name before the
-actual rename on a branch, and then handles other actions (make it opaque,
-update the attributes, etc). If an error happens in these actions, aufs
-simply renames the whiteouted name back and returns an error. If all are
-succeeded, aufs registers a function to remove the whiteouted unique
-temporary name completely and asynchronously to the system global
-workqueue.
-
-
-Copy-up
-----------------------------------------------------------------------
-It is a well-known feature or concept.
-When user modifies a file on a readonly branch, aufs operate "copy-up"
-internally and makes change to the new file on the upper writable branch.
-When the trigger systemcall does not update the timestamps of the parent
-dir, aufs reverts it after copy-up.
-
-
-Move-down (aufs3.9 and later)
-----------------------------------------------------------------------
-"Copy-up" is one of the essential feature in aufs. It copies a file from
-the lower readonly branch to the upper writable branch when a user
-changes something about the file.
-"Move-down" is an opposite action of copy-up. Basically this action is
-ran manually instead of automatically and internally.
-For desgin and implementation, aufs has to consider these issues.
-- whiteout for the file may exist on the lower branch.
-- ancestor directories may not exist on the lower branch.
-- diropq for the ancestor directories may exist on the upper branch.
-- free space on the lower branch will reduce.
-- another access to the file may happen during moving-down, including
- UDBA (see "Revalidate Dentry and UDBA").
-- the file should not be hard-linked nor pseudo-linked. they should be
- handled by auplink utility later.
-
-Sometimes users want to move-down a file from the upper writable branch
-to the lower readonly or writable branch. For instance,
-- the free space of the upper writable branch is going to run out.
-- create a new intermediate branch between the upper and lower branch.
-- etc.
-
-For this purpose, use "aumvdown" command in aufs-util.git.
+++ /dev/null
-
-# Copyright (C) 2015-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Support for a branch who has its ->atomic_open()
-----------------------------------------------------------------------
-The filesystems who implement its ->atomic_open() are not majority. For
-example NFSv4 does, and aufs should call NFSv4 ->atomic_open,
-particularly for open(O_CREAT|O_EXCL, 0400) case. Other than
-->atomic_open(), NFSv4 returns an error for this open(2). While I am not
-sure whether all filesystems who have ->atomic_open() behave like this,
-but NFSv4 surely returns the error.
-
-In order to support ->atomic_open() for aufs, there are a few
-approaches.
-
-A. Introduce aufs_atomic_open()
- - calls one of VFS:do_last(), lookup_open() or atomic_open() for
- branch fs.
-B. Introduce aufs_atomic_open() calling create, open and chmod. this is
- an aufs user Pip Cet's approach
- - calls aufs_create(), VFS finish_open() and notify_change().
- - pass fake-mode to finish_open(), and then correct the mode by
- notify_change().
-C. Extend aufs_open() to call branch fs's ->atomic_open()
- - no aufs_atomic_open().
- - aufs_lookup() registers the TID to an aufs internal object.
- - aufs_create() does nothing when the matching TID is registered, but
- registers the mode.
- - aufs_open() calls branch fs's ->atomic_open() when the matching
- TID is registered.
-D. Extend aufs_open() to re-try branch fs's ->open() with superuser's
- credential
- - no aufs_atomic_open().
- - aufs_create() registers the TID to an internal object. this info
- represents "this process created this file just now."
- - when aufs gets EACCES from branch fs's ->open(), then confirm the
- registered TID and re-try open() with superuser's credential.
-
-Pros and cons for each approach.
-
-A.
- - straightforward but highly depends upon VFS internal.
- - the atomic behavaiour is kept.
- - some of parameters such as nameidata are hard to reproduce for
- branch fs.
- - large overhead.
-B.
- - easy to implement.
- - the atomic behavaiour is lost.
-C.
- - the atomic behavaiour is kept.
- - dirty and tricky.
- - VFS checks whether the file is created correctly after calling
- ->create(), which means this approach doesn't work.
-D.
- - easy to implement.
- - the atomic behavaiour is lost.
- - to open a file with superuser's credential and give it to a user
- process is a bad idea, since the file object keeps the credential
- in it. It may affect LSM or something. This approach doesn't work
- either.
-
-The approach A is ideal, but it hard to implement. So here is a
-variation of A, which is to be implemented.
-
-A-1. Introduce aufs_atomic_open()
- - calls branch fs ->atomic_open() if exists. otherwise calls
- vfs_create() and finish_open().
- - the demerit is that the several checks after branch fs
- ->atomic_open() are lost. in the ordinary case, the checks are
- done by VFS:do_last(), lookup_open() and atomic_open(). some can
- be implemented in aufs, but not all I am afraid.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Lookup in a Branch
-----------------------------------------------------------------------
-Since aufs has a character of sub-VFS (see Introduction), it operates
-lookup for branches as VFS does. It may be a heavy work. But almost all
-lookup operation in aufs is the simplest case, ie. lookup only an entry
-directly connected to its parent. Digging down the directory hierarchy
-is unnecessary. VFS has a function lookup_one_len() for that use, and
-aufs calls it.
-
-When a branch is a remote filesystem, aufs basically relies upon its
-->d_revalidate(), also aufs forces the hardest revalidate tests for
-them.
-For d_revalidate, aufs implements three levels of revalidate tests. See
-"Revalidate Dentry and UDBA" in detail.
-
-
-Test Only the Highest One for the Directory Permission (dirperm1 option)
-----------------------------------------------------------------------
-Let's try case study.
-- aufs has two branches, upper readwrite and lower readonly.
- /au = /rw + /ro
-- "dirA" exists under /ro, but /rw. and its mode is 0700.
-- user invoked "chmod a+rx /au/dirA"
-- the internal copy-up is activated and "/rw/dirA" is created and its
- permission bits are set to world readable.
-- then "/au/dirA" becomes world readable?
-
-In this case, /ro/dirA is still 0700 since it exists in readonly branch,
-or it may be a natively readonly filesystem. If aufs respects the lower
-branch, it should not respond readdir request from other users. But user
-allowed it by chmod. Should really aufs rejects showing the entries
-under /ro/dirA?
-
-To be honest, I don't have a good solution for this case. So aufs
-implements 'dirperm1' and 'nodirperm1' mount options, and leave it to
-users.
-When dirperm1 is specified, aufs checks only the highest one for the
-directory permission, and shows the entries. Otherwise, as usual, checks
-every dir existing on all branches and rejects the request.
-
-As a side effect, dirperm1 option improves the performance of aufs
-because the number of permission check is reduced when the number of
-branch is many.
-
-
-Revalidate Dentry and UDBA (User's Direct Branch Access)
-----------------------------------------------------------------------
-Generally VFS helpers re-validate a dentry as a part of lookup.
-0. digging down the directory hierarchy.
-1. lock the parent dir by its i_mutex.
-2. lookup the final (child) entry.
-3. revalidate it.
-4. call the actual operation (create, unlink, etc.)
-5. unlock the parent dir
-
-If the filesystem implements its ->d_revalidate() (step 3), then it is
-called. Actually aufs implements it and checks the dentry on a branch is
-still valid.
-But it is not enough. Because aufs has to release the lock for the
-parent dir on a branch at the end of ->lookup() (step 2) and
-->d_revalidate() (step 3) while the i_mutex of the aufs dir is still
-held by VFS.
-If the file on a branch is changed directly, eg. bypassing aufs, after
-aufs released the lock, then the subsequent operation may cause
-something unpleasant result.
-
-This situation is a result of VFS architecture, ->lookup() and
-->d_revalidate() is separated. But I never say it is wrong. It is a good
-design from VFS's point of view. It is just not suitable for sub-VFS
-character in aufs.
-
-Aufs supports such case by three level of revalidation which is
-selectable by user.
-1. Simple Revalidate
- Addition to the native flow in VFS's, confirm the child-parent
- relationship on the branch just after locking the parent dir on the
- branch in the "actual operation" (step 4). When this validation
- fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still
- checks the validation of the dentry on branches.
-2. Monitor Changes Internally by Inotify/Fsnotify
- Addition to above, in the "actual operation" (step 4) aufs re-lookup
- the dentry on the branch, and returns EBUSY if it finds different
- dentry.
- Additionally, aufs sets the inotify/fsnotify watch for every dir on branches
- during it is in cache. When the event is notified, aufs registers a
- function to kernel 'events' thread by schedule_work(). And the
- function sets some special status to the cached aufs dentry and inode
- private data. If they are not cached, then aufs has nothing to
- do. When the same file is accessed through aufs (step 0-3) later,
- aufs will detect the status and refresh all necessary data.
- In this mode, aufs has to ignore the event which is fired by aufs
- itself.
-3. No Extra Validation
- This is the simplest test and doesn't add any additional revalidation
- test, and skip the revalidation in step 4. It is useful and improves
- aufs performance when system surely hide the aufs branches from user,
- by over-mounting something (or another method).
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Branch Manipulation
-
-Since aufs supports dynamic branch manipulation, ie. add/remove a branch
-and changing its permission/attribute, there are a lot of works to do.
-
-
-Add a Branch
-----------------------------------------------------------------------
-o Confirm the adding dir exists outside of aufs, including loopback
- mount, and its various attributes.
-o Initialize the xino file and whiteout bases if necessary.
- See struct.txt.
-
-o Check the owner/group/mode of the directory
- When the owner/group/mode of the adding directory differs from the
- existing branch, aufs issues a warning because it may impose a
- security risk.
- For example, when a upper writable branch has a world writable empty
- top directory, a malicious user can create any files on the writable
- branch directly, like copy-up and modify manually. If something like
- /etc/{passwd,shadow} exists on the lower readonly branch but the upper
- writable branch, and the writable branch is world-writable, then a
- malicious guy may create /etc/passwd on the writable branch directly
- and the infected file will be valid in aufs.
- I am afraid it can be a security issue, but aufs can do nothing except
- producing a warning.
-
-
-Delete a Branch
-----------------------------------------------------------------------
-o Confirm the deleting branch is not busy
- To be general, there is one merit to adopt "remount" interface to
- manipulate branches. It is to discard caches. At deleting a branch,
- aufs checks the still cached (and connected) dentries and inodes. If
- there are any, then they are all in-use. An inode without its
- corresponding dentry can be alive alone (for example, inotify/fsnotify case).
-
- For the cached one, aufs checks whether the same named entry exists on
- other branches.
- If the cached one is a directory, because aufs provides a merged view
- to users, as long as one dir is left on any branch aufs can show the
- dir to users. In this case, the branch can be removed from aufs.
- Otherwise aufs rejects deleting the branch.
-
- If any file on the deleting branch is opened by aufs, then aufs
- rejects deleting.
-
-
-Modify the Permission of a Branch
-----------------------------------------------------------------------
-o Re-initialize or remove the xino file and whiteout bases if necessary.
- See struct.txt.
-
-o rw --> ro: Confirm the modifying branch is not busy
- Aufs rejects the request if any of these conditions are true.
- - a file on the branch is mmap-ed.
- - a regular file on the branch is opened for write and there is no
- same named entry on the upper branch.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Policies to Select One among Multiple Writable Branches
-----------------------------------------------------------------------
-When the number of writable branch is more than one, aufs has to decide
-the target branch for file creation or copy-up. By default, the highest
-writable branch which has the parent (or ancestor) dir of the target
-file is chosen (top-down-parent policy).
-By user's request, aufs implements some other policies to select the
-writable branch, for file creation several policies, round-robin,
-most-free-space, and other policies. For copy-up, top-down-parent,
-bottom-up-parent, bottom-up and others.
-
-As expected, the round-robin policy selects the branch in circular. When
-you have two writable branches and creates 10 new files, 5 files will be
-created for each branch. mkdir(2) systemcall is an exception. When you
-create 10 new directories, all will be created on the same branch.
-And the most-free-space policy selects the one which has most free
-space among the writable branches. The amount of free space will be
-checked by aufs internally, and users can specify its time interval.
-
-The policies for copy-up is more simple,
-top-down-parent is equivalent to the same named on in create policy,
-bottom-up-parent selects the writable branch where the parent dir
-exists and the nearest upper one from the copyup-source,
-bottom-up selects the nearest upper writable branch from the
-copyup-source, regardless the existence of the parent dir.
-
-There are some rules or exceptions to apply these policies.
-- If there is a readonly branch above the policy-selected branch and
- the parent dir is marked as opaque (a variation of whiteout), or the
- target (creating) file is whiteout-ed on the upper readonly branch,
- then the result of the policy is ignored and the target file will be
- created on the nearest upper writable branch than the readonly branch.
-- If there is a writable branch above the policy-selected branch and
- the parent dir is marked as opaque or the target file is whiteouted
- on the branch, then the result of the policy is ignored and the target
- file will be created on the highest one among the upper writable
- branches who has diropq or whiteout. In case of whiteout, aufs removes
- it as usual.
-- link(2) and rename(2) systemcalls are exceptions in every policy.
- They try selecting the branch where the source exists as possible
- since copyup a large file will take long time. If it can't be,
- ie. the branch where the source exists is readonly, then they will
- follow the copyup policy.
-- There is an exception for rename(2) when the target exists.
- If the rename target exists, aufs compares the index of the branches
- where the source and the target exists and selects the higher
- one. If the selected branch is readonly, then aufs follows the
- copyup policy.
+++ /dev/null
-
-# Copyright (C) 2011-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-File-based Hierarchical Storage Management (FHSM)
-----------------------------------------------------------------------
-Hierarchical Storage Management (or HSM) is a well-known feature in the
-storage world. Aufs provides this feature as file-based with multiple
-writable branches, based upon the principle of "Colder, the Lower".
-Here the word "colder" means that the less used files, and "lower" means
-that the position in the order of the stacked branches vertically.
-These multiple writable branches are prioritized, ie. the topmost one
-should be the fastest drive and be used heavily.
-
-o Characters in aufs FHSM story
-- aufs itself and a new branch attribute.
-- a new ioctl interface to move-down and to establish a connection with
- the daemon ("move-down" is a converse of "copy-up").
-- userspace tool and daemon.
-
-The userspace daemon establishes a connection with aufs and waits for
-the notification. The notified information is very similar to struct
-statfs containing the number of consumed blocks and inodes.
-When the consumed blocks/inodes of a branch exceeds the user-specified
-upper watermark, the daemon activates its move-down process until the
-consumed blocks/inodes reaches the user-specified lower watermark.
-
-The actual move-down is done by aufs based upon the request from
-user-space since we need to maintain the inode number and the internal
-pointer arrays in aufs.
-
-Currently aufs FHSM handles the regular files only. Additionally they
-must not be hard-linked nor pseudo-linked.
-
-
-o Cowork of aufs and the user-space daemon
- During the userspace daemon established the connection, aufs sends a
- small notification to it whenever aufs writes something into the
- writable branch. But it may cost high since aufs issues statfs(2)
- internally. So user can specify a new option to cache the
- info. Actually the notification is controlled by these factors.
- + the specified cache time.
- + classified as "force" by aufs internally.
- Until the specified time expires, aufs doesn't send the info
- except the forced cases. When aufs decide forcing, the info is always
- notified to userspace.
- For example, the number of free inodes is generally large enough and
- the shortage of it happens rarely. So aufs doesn't force the
- notification when creating a new file, directory and others. This is
- the typical case which aufs doesn't force.
- When aufs writes the actual filedata and the files consumes any of new
- blocks, the aufs forces notifying.
-
-
-o Interfaces in aufs
-- New branch attribute.
- + fhsm
- Specifies that the branch is managed by FHSM feature. In other word,
- participant in the FHSM.
- When nofhsm is set to the branch, it will not be the source/target
- branch of the move-down operation. This attribute is set
- independently from coo and moo attributes, and if you want full
- FHSM, you should specify them as well.
-- New mount option.
- + fhsm_sec
- Specifies a second to suppress many less important info to be
- notified.
-- New ioctl.
- + AUFS_CTL_FHSM_FD
- create a new file descriptor which userspace can read the notification
- (a subset of struct statfs) from aufs.
-- Module parameter 'brs'
- It has to be set to 1. Otherwise the new mount option 'fhsm' will not
- be set.
-- mount helpers /sbin/mount.aufs and /sbin/umount.aufs
- When there are two or more branches with fhsm attributes,
- /sbin/mount.aufs invokes the user-space daemon and /sbin/umount.aufs
- terminates it. As a result of remounting and branch-manipulation, the
- number of branches with fhsm attribute can be one. In this case,
- /sbin/mount.aufs will terminate the user-space daemon.
-
-
-Finally the operation is done as these steps in kernel-space.
-- make sure that,
- + no one else is using the file.
- + the file is not hard-linked.
- + the file is not pseudo-linked.
- + the file is a regular file.
- + the parent dir is not opaqued.
-- find the target writable branch.
-- make sure the file is not whiteout-ed by the upper (than the target)
- branch.
-- make the parent dir on the target branch.
-- mutex lock the inode on the branch.
-- unlink the whiteout on the target branch (if exists).
-- lookup and create the whiteout-ed temporary name on the target branch.
-- copy the file as the whiteout-ed temporary name on the target branch.
-- rename the whiteout-ed temporary name to the original name.
-- unlink the file on the source branch.
-- maintain the internal pointer array and the external inode number
- table (XINO).
-- maintain the timestamps and other attributes of the parent dir and the
- file.
-
-And of course, in every step, an error may happen. So the operation
-should restore the original file state after an error happens.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-mmap(2) -- File Memory Mapping
-----------------------------------------------------------------------
-In aufs, the file-mapped pages are handled by a branch fs directly, no
-interaction with aufs. It means aufs_mmap() calls the branch fs's
-->mmap().
-This approach is simple and good, but there is one problem.
-Under /proc, several entries show the mmapped files by its path (with
-device and inode number), and the printed path will be the path on the
-branch fs's instead of virtual aufs's.
-This is not a problem in most cases, but some utilities lsof(1) (and its
-user) may expect the path on aufs.
-
-To address this issue, aufs adds a new member called vm_prfile in struct
-vm_area_struct (and struct vm_region). The original vm_file points to
-the file on the branch fs in order to handle everything correctly as
-usual. The new vm_prfile points to a virtual file in aufs, and the
-show-functions in procfs refers to vm_prfile if it is set.
-Also we need to maintain several other places where touching vm_file
-such like
-- fork()/clone() copies vma and the reference count of vm_file is
- incremented.
-- merging vma maintains the ref count too.
-
-This is not a good approach. It just fakes the printed path. But it
-leaves all behaviour around f_mapping unchanged. This is surely an
-advantage.
-Actually aufs had adopted another complicated approach which calls
-generic_file_mmap() and handles struct vm_operations_struct. In this
-approach, aufs met a hard problem and I could not solve it without
-switching the approach.
-
-There may be one more another approach which is
-- bind-mount the branch-root onto the aufs-root internally
-- grab the new vfsmount (ie. struct mount)
-- lazy-umount the branch-root internally
-- in open(2) the aufs-file, open the branch-file with the hidden
- vfsmount (instead of the original branch's vfsmount)
-- ideally this "bind-mount and lazy-umount" should be done atomically,
- but it may be possible from userspace by the mount helper.
-
-Adding the internal hidden vfsmount and using it in opening a file, the
-file path under /proc will be printed correctly. This approach looks
-smarter, but is not possible I am afraid.
-- aufs-root may be bind-mount later. when it happens, another hidden
- vfsmount will be required.
-- it is hard to get the chance to bind-mount and lazy-umount
- + in kernel-space, FS can have vfsmount in open(2) via
- file->f_path, and aufs can know its vfsmount. But several locks are
- already acquired, and if aufs tries to bind-mount and lazy-umount
- here, then it may cause a deadlock.
- + in user-space, bind-mount doesn't invoke the mount helper.
-- since /proc shows dev and ino, aufs has to give vma these info. it
- means a new member vm_prinode will be necessary. this is essentially
- equivalent to vm_prfile described above.
-
-I have to give up this "looks-smater" approach.
+++ /dev/null
-
-# Copyright (C) 2014-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-Listing XATTR/EA and getting the value
-----------------------------------------------------------------------
-For the inode standard attributes (owner, group, timestamps, etc.), aufs
-shows the values from the topmost existing file. This behaviour is good
-for the non-dir entries since the bahaviour exactly matches the shown
-information. But for the directories, aufs considers all the same named
-entries on the lower branches. Which means, if one of the lower entry
-rejects readdir call, then aufs returns an error even if the topmost
-entry allows it. This behaviour is necessary to respect the branch fs's
-security, but can make users confused since the user-visible standard
-attributes don't match the behaviour.
-To address this issue, aufs has a mount option called dirperm1 which
-checks the permission for the topmost entry only, and ignores the lower
-entry's permission.
-
-A similar issue can happen around XATTR.
-getxattr(2) and listxattr(2) families behave as if dirperm1 option is
-always set. Otherwise these very unpleasant situation would happen.
-- listxattr(2) may return the duplicated entries.
-- users may not be able to remove or reset the XATTR forever,
-
-
-XATTR/EA support in the internal (copy,move)-(up,down)
-----------------------------------------------------------------------
-Generally the extended attributes of inode are categorized as these.
-- "security" for LSM and capability.
-- "system" for posix ACL, 'acl' mount option is required for the branch
- fs generally.
-- "trusted" for userspace, CAP_SYS_ADMIN is required.
-- "user" for userspace, 'user_xattr' mount option is required for the
- branch fs generally.
-
-Moreover there are some other categories. Aufs handles these rather
-unpopular categories as the ordinary ones, ie. there is no special
-condition nor exception.
-
-In copy-up, the support for XATTR on the dst branch may differ from the
-src branch. In this case, the copy-up operation will get an error and
-the original user operation which triggered the copy-up will fail. It
-can happen that even all copy-up will fail.
-When both of src and dst branches support XATTR and if an error occurs
-during copying XATTR, then the copy-up should fail obviously. That is a
-good reason and aufs should return an error to userspace. But when only
-the src branch support that XATTR, aufs should not return an error.
-For example, the src branch supports ACL but the dst branch doesn't
-because the dst branch may natively un-support it or temporary
-un-support it due to "noacl" mount option. Of course, the dst branch fs
-may NOT return an error even if the XATTR is not supported. It is
-totally up to the branch fs.
-
-Anyway when the aufs internal copy-up gets an error from the dst branch
-fs, then aufs tries removing the just copied entry and returns the error
-to the userspace. The worst case of this situation will be all copy-up
-will fail.
-
-For the copy-up operation, there two basic approaches.
-- copy the specified XATTR only (by category above), and return the
- error unconditionally if it happens.
-- copy all XATTR, and ignore the error on the specified category only.
-
-In order to support XATTR and to implement the correct behaviour, aufs
-chooses the latter approach and introduces some new branch attributes,
-"icexsec", "icexsys", "icextr", "icexusr", and "icexoth".
-They correspond to the XATTR namespaces (see above). Additionally, to be
-convenient, "icex" is also provided which means all "icex*" attributes
-are set (here the word "icex" stands for "ignore copy-error on XATTR").
-
-The meaning of these attributes is to ignore the error from setting
-XATTR on that branch.
-Note that aufs tries copying all XATTR unconditionally, and ignores the
-error from the dst branch according to the specified attributes.
-
-Some XATTR may have its default value. The default value may come from
-the parent dir or the environment. If the default value is set at the
-file creating-time, it will be overwritten by copy-up.
-Some contradiction may happen I am afraid.
-Do we need another attribute to stop copying XATTR? I am unsure. For
-now, aufs implements the branch attributes to ignore the error.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Export Aufs via NFS
-----------------------------------------------------------------------
-Here is an approach.
-- like xino/xib, add a new file 'xigen' which stores aufs inode
- generation.
-- iget_locked(): initialize aufs inode generation for a new inode, and
- store it in xigen file.
-- destroy_inode(): increment aufs inode generation and store it in xigen
- file. it is necessary even if it is not unlinked, because any data of
- inode may be changed by UDBA.
-- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise
- build file handle by
- + branch id (4 bytes)
- + superblock generation (4 bytes)
- + inode number (4 or 8 bytes)
- + parent dir inode number (4 or 8 bytes)
- + inode generation (4 bytes))
- + return value of exportfs_encode_fh() for the parent on a branch (4
- bytes)
- + file handle for a branch (by exportfs_encode_fh())
-- fh_to_dentry():
- + find the index of a branch from its id in handle, and check it is
- still exist in aufs.
- + 1st level: get the inode number from handle and search it in cache.
- + 2nd level: if not found in cache, get the parent inode number from
- the handle and search it in cache. and then open the found parent
- dir, find the matching inode number by vfs_readdir() and get its
- name, and call lookup_one_len() for the target dentry.
- + 3rd level: if the parent dir is not cached, call
- exportfs_decode_fh() for a branch and get the parent on a branch,
- build a pathname of it, convert it a pathname in aufs, call
- path_lookup(). now aufs gets a parent dir dentry, then handle it as
- the 2nd level.
- + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount
- for every branch, but not itself. to get this, (currently) aufs
- searches in current->nsproxy->mnt_ns list. it may not be a good
- idea, but I didn't get other approach.
- + test the generation of the gotten inode.
-- every inode operation: they may get EBUSY due to UDBA. in this case,
- convert it into ESTALE for NFSD.
-- readdir(): call lockdep_on/off() because filldir in NFSD calls
- lookup_one_len(), vfs_getattr(), encode_fh() and others.
+++ /dev/null
-
-# Copyright (C) 2005-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Show Whiteout Mode (shwh)
-----------------------------------------------------------------------
-Generally aufs hides the name of whiteouts. But in some cases, to show
-them is very useful for users. For instance, creating a new middle layer
-(branch) by merging existing layers.
-
-(borrowing aufs1 HOW-TO from a user, Michael Towers)
-When you have three branches,
-- Bottom: 'system', squashfs (underlying base system), read-only
-- Middle: 'mods', squashfs, read-only
-- Top: 'overlay', ram (tmpfs), read-write
-
-The top layer is loaded at boot time and saved at shutdown, to preserve
-the changes made to the system during the session.
-When larger changes have been made, or smaller changes have accumulated,
-the size of the saved top layer data grows. At this point, it would be
-nice to be able to merge the two overlay branches ('mods' and 'overlay')
-and rewrite the 'mods' squashfs, clearing the top layer and thus
-restoring save and load speed.
-
-This merging is simplified by the use of another aufs mount, of just the
-two overlay branches using the 'shwh' option.
-# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \
- aufs /livesys/merge_union
-
-A merged view of these two branches is then available at
-/livesys/merge_union, and the new feature is that the whiteouts are
-visible!
-Note that in 'shwh' mode the aufs mount must be 'ro', which will disable
-writing to all branches. Also the default mode for all branches is 'ro'.
-It is now possible to save the combined contents of the two overlay
-branches to a new squashfs, e.g.:
-# mksquashfs /livesys/merge_union /path/to/newmods.squash
-
-This new squashfs archive can be stored on the boot device and the
-initramfs will use it to replace the old one at the next boot.
+++ /dev/null
-
-# Copyright (C) 2010-2016 Junjiro R. Okajima
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-Dynamically customizable FS operations
-----------------------------------------------------------------------
-Generally FS operations (struct inode_operations, struct
-address_space_operations, struct file_operations, etc.) are defined as
-"static const", but it never means that FS have only one set of
-operation. Some FS have multiple sets of them. For instance, ext2 has
-three sets, one for XIP, for NOBH, and for normal.
-Since aufs overrides and redirects these operations, sometimes aufs has
-to change its behaviour according to the branch FS type. More importantly
-VFS acts differently if a function (member in the struct) is set or
-not. It means aufs should have several sets of operations and select one
-among them according to the branch FS definition.
-
-In order to solve this problem and not to affect the behaviour of VFS,
-aufs defines these operations dynamically. For instance, aufs defines
-dummy direct_IO function for struct address_space_operations, but it may
-not be set to the address_space_operations actually. When the branch FS
-doesn't have it, aufs doesn't set it to its address_space_operations
-while the function definition itself is still alive. So the behaviour
-itself will not change, and it will return an error when direct_IO is
-not set.
-
-The lifetime of these dynamically generated operation object is
-maintained by aufs branch object. When the branch is removed from aufs,
-the reference counter of the object is decremented. When it reaches
-zero, the dynamically generated operation object will be freed.
-
-This approach is designed to support AIO (io_submit), Direct I/O and
-XIP (DAX) mainly.
-Currently this approach is applied to address_space_operations for
-regular files only.
F: include/uapi/linux/audit.h
F: kernel/audit*
-AUFS (advanced multi layered unification filesystem) FILESYSTEM
-M: "J. R. Okajima" <hooanon05g@gmail.com>
-L: linux-unionfs@vger.kernel.org
-L: aufs-users@lists.sourceforge.net (members only)
-W: http://aufs.sourceforge.net
-T: git://github.com/sfjro/aufs4-linux.git
-S: Supported
-F: Documentation/filesystems/aufs/
-F: Documentation/ABI/testing/debugfs-aufs
-F: Documentation/ABI/testing/sysfs-aufs
-F: fs/aufs/
-F: include/uapi/linux/aufs_type.h
-
AUXILIARY DISPLAY DRIVERS
M: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
W: http://miguelojeda.es/auxdisplay.htm
return i && S_ISBLK(i->i_mode) && MAJOR(i->i_rdev) == LOOP_MAJOR;
}
-/*
- * for AUFS
- * no get/put for file.
- */
-struct file *loop_backing_file(struct super_block *sb)
-{
- struct file *ret;
- struct loop_device *l;
-
- ret = NULL;
- if (MAJOR(sb->s_dev) == LOOP_MAJOR) {
- l = sb->s_bdev->bd_disk->private_data;
- ret = l->lo_backing_file;
- }
- return ret;
-}
-EXPORT_SYMBOL_GPL(loop_backing_file);
-
/* loop sysfs attributes */
static ssize_t loop_attr_show(struct device *dev, char *page,
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/exofs/Kconfig"
-source "fs/aufs/Kconfig"
endif # MISC_FILESYSTEMS
obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/
obj-$(CONFIG_EFIVAR_FS) += efivarfs/
-obj-$(CONFIG_AUFS_FS) += aufs/
+++ /dev/null
-config AUFS_FS
- tristate "Aufs (Advanced multi layered unification filesystem) support"
- help
- Aufs is a stackable unification filesystem such as Unionfs,
- which unifies several directories and provides a merged single
- directory.
- In the early days, aufs was entirely re-designed and
- re-implemented Unionfs Version 1.x series. Introducing many
- original ideas, approaches and improvements, it becomes totally
- different from Unionfs while keeping the basic features.
-
-if AUFS_FS
-choice
- prompt "Maximum number of branches"
- default AUFS_BRANCH_MAX_127
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_127
- bool "127"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_511
- bool "511"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_1023
- bool "1023"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-config AUFS_BRANCH_MAX_32767
- bool "32767"
- help
- Specifies the maximum number of branches (or member directories)
- in a single aufs. The larger value consumes more system
- resources and has a minor impact to performance.
-endchoice
-
-config AUFS_SBILIST
- bool
- depends on AUFS_MAGIC_SYSRQ || PROC_FS
- default y
- help
- Automatic configuration for internal use.
- When aufs supports Magic SysRq or /proc, enabled automatically.
-
-config AUFS_HNOTIFY
- bool "Detect direct branch access (bypassing aufs)"
- help
- If you want to modify files on branches directly, eg. bypassing aufs,
- and want aufs to detect the changes of them fully, then enable this
- option and use 'udba=notify' mount option.
- Currently there is only one available configuration, "fsnotify".
- It will have a negative impact to the performance.
- See detail in aufs.5.
-
-choice
- prompt "method" if AUFS_HNOTIFY
- default AUFS_HFSNOTIFY
-config AUFS_HFSNOTIFY
- bool "fsnotify"
- select FSNOTIFY
-endchoice
-
-config AUFS_EXPORT
- bool "NFS-exportable aufs"
- depends on EXPORTFS
- help
- If you want to export your mounted aufs via NFS, then enable this
- option. There are several requirements for this configuration.
- See detail in aufs.5.
-
-config AUFS_INO_T_64
- bool
- depends on AUFS_EXPORT
- depends on 64BIT && !(ALPHA || S390)
- default y
- help
- Automatic configuration for internal use.
- /* typedef unsigned long/int __kernel_ino_t */
- /* alpha and s390x are int */
-
-config AUFS_XATTR
- bool "support for XATTR/EA (including Security Labels)"
- help
- If your branch fs supports XATTR/EA and you want to make them
- available in aufs too, then enable this opsion and specify the
- branch attributes for EA.
- See detail in aufs.5.
-
-config AUFS_FHSM
- bool "File-based Hierarchical Storage Management"
- help
- Hierarchical Storage Management (or HSM) is a well-known feature
- in the storage world. Aufs provides this feature as file-based.
- with multiple branches.
- These multiple branches are prioritized, ie. the topmost one
- should be the fastest drive and be used heavily.
-
-config AUFS_RDU
- bool "Readdir in userspace"
- help
- Aufs has two methods to provide a merged view for a directory,
- by a user-space library and by kernel-space natively. The latter
- is always enabled but sometimes large and slow.
- If you enable this option, install the library in aufs2-util
- package, and set some environment variables for your readdir(3),
- then the work will be handled in user-space which generally
- shows better performance in most cases.
- See detail in aufs.5.
-
-config AUFS_SHWH
- bool "Show whiteouts"
- help
- If you want to make the whiteouts in aufs visible, then enable
- this option and specify 'shwh' mount option. Although it may
- sounds like philosophy or something, but in technically it
- simply shows the name of whiteout with keeping its behaviour.
-
-config AUFS_BR_RAMFS
- bool "Ramfs (initramfs/rootfs) as an aufs branch"
- help
- If you want to use ramfs as an aufs branch fs, then enable this
- option. Generally tmpfs is recommended.
- Aufs prohibited them to be a branch fs by default, because
- initramfs becomes unusable after switch_root or something
- generally. If you sets initramfs as an aufs branch and boot your
- system by switch_root, you will meet a problem easily since the
- files in initramfs may be inaccessible.
- Unless you are going to use ramfs as an aufs branch fs without
- switch_root or something, leave it N.
-
-config AUFS_BR_FUSE
- bool "Fuse fs as an aufs branch"
- depends on FUSE_FS
- select AUFS_POLL
- help
- If you want to use fuse-based userspace filesystem as an aufs
- branch fs, then enable this option.
- It implements the internal poll(2) operation which is
- implemented by fuse only (curretnly).
-
-config AUFS_POLL
- bool
- help
- Automatic configuration for internal use.
-
-config AUFS_BR_HFSPLUS
- bool "Hfsplus as an aufs branch"
- depends on HFSPLUS_FS
- default y
- help
- If you want to use hfsplus fs as an aufs branch fs, then enable
- this option. This option introduces a small overhead at
- copying-up a file on hfsplus.
-
-config AUFS_BDEV_LOOP
- bool
- depends on BLK_DEV_LOOP
- default y
- help
- Automatic configuration for internal use.
- Convert =[ym] into =y.
-
-config AUFS_DEBUG
- bool "Debug aufs"
- help
- Enable this to compile aufs internal debug code.
- It will have a negative impact to the performance.
-
-config AUFS_MAGIC_SYSRQ
- bool
- depends on AUFS_DEBUG && MAGIC_SYSRQ
- default y
- help
- Automatic configuration for internal use.
- When aufs supports Magic SysRq, enabled automatically.
-endif
+++ /dev/null
-
-include ${src}/magic.mk
-ifeq (${CONFIG_AUFS_FS},m)
-include ${src}/conf.mk
-endif
--include ${src}/priv_def.mk
-
-# cf. include/linux/kernel.h
-# enable pr_debug
-ccflags-y += -DDEBUG
-# sparse requires the full pathname
-ifdef M
-ccflags-y += -include ${M}/../../include/uapi/linux/aufs_type.h
-else
-ccflags-y += -include ${srctree}/include/uapi/linux/aufs_type.h
-endif
-
-obj-$(CONFIG_AUFS_FS) += aufs.o
-aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \
- wkq.o vfsub.o dcsub.o \
- cpup.o whout.o wbr_policy.o \
- dinfo.o dentry.o \
- dynop.o \
- finfo.o file.o f_op.o \
- dir.o vdir.o \
- iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \
- mvdown.o ioctl.o
-
-# all are boolean
-aufs-$(CONFIG_PROC_FS) += procfs.o plink.o
-aufs-$(CONFIG_SYSFS) += sysfs.o
-aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o
-aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o
-aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o
-aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o
-aufs-$(CONFIG_AUFS_EXPORT) += export.o
-aufs-$(CONFIG_AUFS_XATTR) += xattr.o
-aufs-$(CONFIG_FS_POSIX_ACL) += posix_acl.o
-aufs-$(CONFIG_AUFS_FHSM) += fhsm.o
-aufs-$(CONFIG_AUFS_POLL) += poll.o
-aufs-$(CONFIG_AUFS_RDU) += rdu.o
-aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o
-aufs-$(CONFIG_AUFS_DEBUG) += debug.o
-aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * all header files
- */
-
-#ifndef __AUFS_H__
-#define __AUFS_H__
-
-#ifdef __KERNEL__
-
-#define AuStub(type, name, body, ...) \
- static inline type name(__VA_ARGS__) { body; }
-
-#define AuStubVoid(name, ...) \
- AuStub(void, name, , __VA_ARGS__)
-#define AuStubInt0(name, ...) \
- AuStub(int, name, return 0, __VA_ARGS__)
-
-#include "debug.h"
-
-#include "branch.h"
-#include "cpup.h"
-#include "dcsub.h"
-#include "dbgaufs.h"
-#include "dentry.h"
-#include "dir.h"
-#include "dynop.h"
-#include "file.h"
-#include "fstype.h"
-#include "inode.h"
-#include "loop.h"
-#include "module.h"
-#include "opts.h"
-#include "rwsem.h"
-#include "spl.h"
-#include "super.h"
-#include "sysaufs.h"
-#include "vfsub.h"
-#include "whout.h"
-#include "wkq.h"
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * branch management
- */
-
-#include <linux/compat.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/*
- * free a single branch
- */
-static void au_br_do_free(struct au_branch *br)
-{
- int i;
- struct au_wbr *wbr;
- struct au_dykey **key;
-
- au_hnotify_fin_br(br);
-
- if (br->br_xino.xi_file)
- fput(br->br_xino.xi_file);
- mutex_destroy(&br->br_xino.xi_nondir_mtx);
-
- AuDebugOn(au_br_count(br));
- au_br_count_fin(br);
-
- wbr = br->br_wbr;
- if (wbr) {
- for (i = 0; i < AuBrWh_Last; i++)
- dput(wbr->wbr_wh[i]);
- AuDebugOn(atomic_read(&wbr->wbr_wh_running));
- AuRwDestroy(&wbr->wbr_wh_rwsem);
- }
-
- if (br->br_fhsm) {
- au_br_fhsm_fin(br->br_fhsm);
- au_delayed_kfree(br->br_fhsm);
- }
-
- key = br->br_dykey;
- for (i = 0; i < AuBrDynOp; i++, key++)
- if (*key)
- au_dy_put(*key);
- else
- break;
-
- /* recursive lock, s_umount of branch's */
- lockdep_off();
- path_put(&br->br_path);
- lockdep_on();
- if (wbr)
- au_delayed_kfree(wbr);
- au_delayed_kfree(br);
-}
-
-/*
- * frees all branches
- */
-void au_br_free(struct au_sbinfo *sbinfo)
-{
- aufs_bindex_t bmax;
- struct au_branch **br;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- bmax = sbinfo->si_bbot + 1;
- br = sbinfo->si_branch;
- while (bmax--)
- au_br_do_free(*br++);
-}
-
-/*
- * find the index of a branch which is specified by @br_id.
- */
-int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
-{
- aufs_bindex_t bindex, bbot;
-
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++)
- if (au_sbr_id(sb, bindex) == br_id)
- return bindex;
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * add a branch
- */
-
-static int test_overlap(struct super_block *sb, struct dentry *h_adding,
- struct dentry *h_root)
-{
- if (unlikely(h_adding == h_root
- || au_test_loopback_overlap(sb, h_adding)))
- return 1;
- if (h_adding->d_sb != h_root->d_sb)
- return 0;
- return au_test_subdir(h_adding, h_root)
- || au_test_subdir(h_root, h_adding);
-}
-
-/*
- * returns a newly allocated branch. @new_nbranch is a number of branches
- * after adding a branch.
- */
-static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
- int perm)
-{
- struct au_branch *add_branch;
- struct dentry *root;
- struct inode *inode;
- int err;
-
- err = -ENOMEM;
- root = sb->s_root;
- add_branch = kzalloc(sizeof(*add_branch), GFP_NOFS);
- if (unlikely(!add_branch))
- goto out;
-
- err = au_hnotify_init_br(add_branch, perm);
- if (unlikely(err))
- goto out_br;
-
- if (au_br_writable(perm)) {
- /* may be freed separately at changing the branch permission */
- add_branch->br_wbr = kzalloc(sizeof(*add_branch->br_wbr),
- GFP_NOFS);
- if (unlikely(!add_branch->br_wbr))
- goto out_hnotify;
- }
-
- if (au_br_fhsm(perm)) {
- err = au_fhsm_br_alloc(add_branch);
- if (unlikely(err))
- goto out_wbr;
- }
-
- err = au_sbr_realloc(au_sbi(sb), new_nbranch, /*may_shrink*/0);
- if (!err)
- err = au_di_realloc(au_di(root), new_nbranch, /*may_shrink*/0);
- if (!err) {
- inode = d_inode(root);
- err = au_hinode_realloc(au_ii(inode), new_nbranch, /*may_shrink*/0);
- }
- if (!err)
- return add_branch; /* success */
-
-out_wbr:
- if (add_branch->br_wbr)
- au_delayed_kfree(add_branch->br_wbr);
-out_hnotify:
- au_hnotify_fin_br(add_branch);
-out_br:
- au_delayed_kfree(add_branch);
-out:
- return ERR_PTR(err);
-}
-
-/*
- * test if the branch permission is legal or not.
- */
-static int test_br(struct inode *inode, int brperm, char *path)
-{
- int err;
-
- err = (au_br_writable(brperm) && IS_RDONLY(inode));
- if (!err)
- goto out;
-
- err = -EINVAL;
- pr_err("write permission for readonly mount or inode, %s\n", path);
-
-out:
- return err;
-}
-
-/*
- * returns:
- * 0: success, the caller will add it
- * plus: success, it is already unified, the caller should ignore it
- * minus: error
- */
-static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
- int err;
- aufs_bindex_t bbot, bindex;
- struct dentry *root, *h_dentry;
- struct inode *inode, *h_inode;
-
- root = sb->s_root;
- bbot = au_sbbot(sb);
- if (unlikely(bbot >= 0
- && au_find_dbindex(root, add->path.dentry) >= 0)) {
- err = 1;
- if (!remount) {
- err = -EINVAL;
- pr_err("%s duplicated\n", add->pathname);
- }
- goto out;
- }
-
- err = -ENOSPC; /* -E2BIG; */
- if (unlikely(AUFS_BRANCH_MAX <= add->bindex
- || AUFS_BRANCH_MAX - 1 <= bbot)) {
- pr_err("number of branches exceeded %s\n", add->pathname);
- goto out;
- }
-
- err = -EDOM;
- if (unlikely(add->bindex < 0 || bbot + 1 < add->bindex)) {
- pr_err("bad index %d\n", add->bindex);
- goto out;
- }
-
- inode = d_inode(add->path.dentry);
- err = -ENOENT;
- if (unlikely(!inode->i_nlink)) {
- pr_err("no existence %s\n", add->pathname);
- goto out;
- }
-
- err = -EINVAL;
- if (unlikely(inode->i_sb == sb)) {
- pr_err("%s must be outside\n", add->pathname);
- goto out;
- }
-
- if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
- pr_err("unsupported filesystem, %s (%s)\n",
- add->pathname, au_sbtype(inode->i_sb));
- goto out;
- }
-
- if (unlikely(inode->i_sb->s_stack_depth)) {
- pr_err("already stacked, %s (%s)\n",
- add->pathname, au_sbtype(inode->i_sb));
- goto out;
- }
-
- err = test_br(d_inode(add->path.dentry), add->perm, add->pathname);
- if (unlikely(err))
- goto out;
-
- if (bbot < 0)
- return 0; /* success */
-
- err = -EINVAL;
- for (bindex = 0; bindex <= bbot; bindex++)
- if (unlikely(test_overlap(sb, add->path.dentry,
- au_h_dptr(root, bindex)))) {
- pr_err("%s is overlapped\n", add->pathname);
- goto out;
- }
-
- err = 0;
- if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
- h_dentry = au_h_dptr(root, 0);
- h_inode = d_inode(h_dentry);
- if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
- || !uid_eq(h_inode->i_uid, inode->i_uid)
- || !gid_eq(h_inode->i_gid, inode->i_gid))
- pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
- add->pathname,
- i_uid_read(inode), i_gid_read(inode),
- (inode->i_mode & S_IALLUGO),
- i_uid_read(h_inode), i_gid_read(h_inode),
- (h_inode->i_mode & S_IALLUGO));
- }
-
-out:
- return err;
-}
-
-/*
- * initialize or clean the whiteouts for an adding branch
- */
-static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
- int new_perm)
-{
- int err, old_perm;
- aufs_bindex_t bindex;
- struct inode *h_inode;
- struct au_wbr *wbr;
- struct au_hinode *hdir;
- struct dentry *h_dentry;
-
- err = vfsub_mnt_want_write(au_br_mnt(br));
- if (unlikely(err))
- goto out;
-
- wbr = br->br_wbr;
- old_perm = br->br_perm;
- br->br_perm = new_perm;
- hdir = NULL;
- h_inode = NULL;
- bindex = au_br_index(sb, br->br_id);
- if (0 <= bindex) {
- hdir = au_hi(d_inode(sb->s_root), bindex);
- au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
- } else {
- h_dentry = au_br_dentry(br);
- h_inode = d_inode(h_dentry);
- inode_lock_nested(h_inode, AuLsc_I_PARENT);
- }
- if (!wbr)
- err = au_wh_init(br, sb);
- else {
- wbr_wh_write_lock(wbr);
- err = au_wh_init(br, sb);
- wbr_wh_write_unlock(wbr);
- }
- if (hdir)
- au_hn_inode_unlock(hdir);
- else
- inode_unlock(h_inode);
- vfsub_mnt_drop_write(au_br_mnt(br));
- br->br_perm = old_perm;
-
- if (!err && wbr && !au_br_writable(new_perm)) {
- au_delayed_kfree(wbr);
- br->br_wbr = NULL;
- }
-
-out:
- return err;
-}
-
-static int au_wbr_init(struct au_branch *br, struct super_block *sb,
- int perm)
-{
- int err;
- struct kstatfs kst;
- struct au_wbr *wbr;
-
- wbr = br->br_wbr;
- au_rw_init(&wbr->wbr_wh_rwsem);
- atomic_set(&wbr->wbr_wh_running, 0);
-
- /*
- * a limit for rmdir/rename a dir
- * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h
- */
- err = vfs_statfs(&br->br_path, &kst);
- if (unlikely(err))
- goto out;
- err = -EINVAL;
- if (kst.f_namelen >= NAME_MAX)
- err = au_br_init_wh(sb, br, perm);
- else
- pr_err("%pd(%s), unsupported namelen %ld\n",
- au_br_dentry(br),
- au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen);
-
-out:
- return err;
-}
-
-/* initialize a new branch */
-static int au_br_init(struct au_branch *br, struct super_block *sb,
- struct au_opt_add *add)
-{
- int err;
- struct inode *h_inode;
-
- err = 0;
- mutex_init(&br->br_xino.xi_nondir_mtx);
- br->br_perm = add->perm;
- br->br_path = add->path; /* set first, path_get() later */
- spin_lock_init(&br->br_dykey_lock);
- au_br_count_init(br);
- atomic_set(&br->br_xino_running, 0);
- br->br_id = au_new_br_id(sb);
- AuDebugOn(br->br_id < 0);
-
- if (au_br_writable(add->perm)) {
- err = au_wbr_init(br, sb, add->perm);
- if (unlikely(err))
- goto out_err;
- }
-
- if (au_opt_test(au_mntflags(sb), XINO)) {
- h_inode = d_inode(add->path.dentry);
- err = au_xino_br(sb, br, h_inode->i_ino,
- au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
- if (unlikely(err)) {
- AuDebugOn(br->br_xino.xi_file);
- goto out_err;
- }
- }
-
- sysaufs_br_init(br);
- path_get(&br->br_path);
- goto out; /* success */
-
-out_err:
- memset(&br->br_path, 0, sizeof(br->br_path));
-out:
- return err;
-}
-
-static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
- struct au_branch *br, aufs_bindex_t bbot,
- aufs_bindex_t amount)
-{
- struct au_branch **brp;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- brp = sbinfo->si_branch + bindex;
- memmove(brp + 1, brp, sizeof(*brp) * amount);
- *brp = br;
- sbinfo->si_bbot++;
- if (unlikely(bbot < 0))
- sbinfo->si_bbot = 0;
-}
-
-static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
- aufs_bindex_t bbot, aufs_bindex_t amount)
-{
- struct au_hdentry *hdp;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- hdp = au_hdentry(dinfo, bindex);
- memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
- au_h_dentry_init(hdp);
- dinfo->di_bbot++;
- if (unlikely(bbot < 0))
- dinfo->di_btop = 0;
-}
-
-static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
- aufs_bindex_t bbot, aufs_bindex_t amount)
-{
- struct au_hinode *hip;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- hip = au_hinode(iinfo, bindex);
- memmove(hip + 1, hip, sizeof(*hip) * amount);
- au_hinode_init(hip);
- iinfo->ii_bbot++;
- if (unlikely(bbot < 0))
- iinfo->ii_btop = 0;
-}
-
-static void au_br_do_add(struct super_block *sb, struct au_branch *br,
- aufs_bindex_t bindex)
-{
- struct dentry *root, *h_dentry;
- struct inode *root_inode, *h_inode;
- aufs_bindex_t bbot, amount;
-
- root = sb->s_root;
- root_inode = d_inode(root);
- bbot = au_sbbot(sb);
- amount = bbot + 1 - bindex;
- h_dentry = au_br_dentry(br);
- au_sbilist_lock();
- au_br_do_add_brp(au_sbi(sb), bindex, br, bbot, amount);
- au_br_do_add_hdp(au_di(root), bindex, bbot, amount);
- au_br_do_add_hip(au_ii(root_inode), bindex, bbot, amount);
- au_set_h_dptr(root, bindex, dget(h_dentry));
- h_inode = d_inode(h_dentry);
- au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0);
- au_sbilist_unlock();
-}
-
-int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
-{
- int err;
- aufs_bindex_t bbot, add_bindex;
- struct dentry *root, *h_dentry;
- struct inode *root_inode;
- struct au_branch *add_branch;
-
- root = sb->s_root;
- root_inode = d_inode(root);
- IMustLock(root_inode);
- IiMustWriteLock(root_inode);
- err = test_add(sb, add, remount);
- if (unlikely(err < 0))
- goto out;
- if (err) {
- err = 0;
- goto out; /* success */
- }
-
- bbot = au_sbbot(sb);
- add_branch = au_br_alloc(sb, bbot + 2, add->perm);
- err = PTR_ERR(add_branch);
- if (IS_ERR(add_branch))
- goto out;
-
- err = au_br_init(add_branch, sb, add);
- if (unlikely(err)) {
- au_br_do_free(add_branch);
- goto out;
- }
-
- add_bindex = add->bindex;
- if (!remount)
- au_br_do_add(sb, add_branch, add_bindex);
- else {
- sysaufs_brs_del(sb, add_bindex);
- au_br_do_add(sb, add_branch, add_bindex);
- sysaufs_brs_add(sb, add_bindex);
- }
-
- h_dentry = add->path.dentry;
- if (!add_bindex) {
- au_cpup_attr_all(root_inode, /*force*/1);
- sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
- } else
- au_add_nlink(root_inode, d_inode(h_dentry));
-
- /*
- * this test/set prevents aufs from handling unnecesary notify events
- * of xino files, in case of re-adding a writable branch which was
- * once detached from aufs.
- */
- if (au_xino_brid(sb) < 0
- && au_br_writable(add_branch->br_perm)
- && !au_test_fs_bad_xino(h_dentry->d_sb)
- && add_branch->br_xino.xi_file
- && add_branch->br_xino.xi_file->f_path.dentry->d_parent == h_dentry)
- au_xino_brid_set(sb, add_branch->br_id);
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static unsigned long long au_farray_cb(struct super_block *sb, void *a,
- unsigned long long max __maybe_unused,
- void *arg)
-{
- unsigned long long n;
- struct file **p, *f;
- struct au_sphlhead *files;
- struct au_finfo *finfo;
-
- n = 0;
- p = a;
- files = &au_sbi(sb)->si_files;
- spin_lock(&files->spin);
- hlist_for_each_entry(finfo, &files->head, fi_hlist) {
- f = finfo->fi_file;
- if (file_count(f)
- && !special_file(file_inode(f)->i_mode)) {
- get_file(f);
- *p++ = f;
- n++;
- AuDebugOn(n > max);
- }
- }
- spin_unlock(&files->spin);
-
- return n;
-}
-
-static struct file **au_farray_alloc(struct super_block *sb,
- unsigned long long *max)
-{
- *max = au_nfiles(sb);
- return au_array_alloc(max, au_farray_cb, sb, /*arg*/NULL);
-}
-
-static void au_farray_free(struct file **a, unsigned long long max)
-{
- unsigned long long ull;
-
- for (ull = 0; ull < max; ull++)
- if (a[ull])
- fput(a[ull]);
- kvfree(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * delete a branch
- */
-
-/* to show the line number, do not make it inlined function */
-#define AuVerbose(do_info, fmt, ...) do { \
- if (do_info) \
- pr_info(fmt, ##__VA_ARGS__); \
-} while (0)
-
-static int au_test_ibusy(struct inode *inode, aufs_bindex_t btop,
- aufs_bindex_t bbot)
-{
- return (inode && !S_ISDIR(inode->i_mode)) || btop == bbot;
-}
-
-static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t btop,
- aufs_bindex_t bbot)
-{
- return au_test_ibusy(d_inode(dentry), btop, bbot);
-}
-
-/*
- * test if the branch is deletable or not.
- */
-static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
- unsigned int sigen, const unsigned int verbose)
-{
- int err, i, j, ndentry;
- aufs_bindex_t btop, bbot;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry *d;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, root, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- for (i = 0; !err && i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- ndentry = dpage->ndentry;
- for (j = 0; !err && j < ndentry; j++) {
- d = dpage->dentries[j];
- AuDebugOn(au_dcount(d) <= 0);
- if (!au_digen_test(d, sigen)) {
- di_read_lock_child(d, AuLock_IR);
- if (unlikely(au_dbrange_test(d))) {
- di_read_unlock(d, AuLock_IR);
- continue;
- }
- } else {
- di_write_lock_child(d);
- if (unlikely(au_dbrange_test(d))) {
- di_write_unlock(d);
- continue;
- }
- err = au_reval_dpath(d, sigen);
- if (!err)
- di_downgrade_lock(d, AuLock_IR);
- else {
- di_write_unlock(d);
- break;
- }
- }
-
- /* AuDbgDentry(d); */
- btop = au_dbtop(d);
- bbot = au_dbbot(d);
- if (btop <= bindex
- && bindex <= bbot
- && au_h_dptr(d, bindex)
- && au_test_dbusy(d, btop, bbot)) {
- err = -EBUSY;
- AuVerbose(verbose, "busy %pd\n", d);
- AuDbgDentry(d);
- }
- di_read_unlock(d, AuLock_IR);
- }
- }
-
-out_dpages:
- au_dpages_free(&dpages);
-out:
- return err;
-}
-
-static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
- unsigned int sigen, const unsigned int verbose)
-{
- int err;
- unsigned long long max, ull;
- struct inode *i, **array;
- aufs_bindex_t btop, bbot;
-
- array = au_iarray_alloc(sb, &max);
- err = PTR_ERR(array);
- if (IS_ERR(array))
- goto out;
-
- err = 0;
- AuDbg("b%d\n", bindex);
- for (ull = 0; !err && ull < max; ull++) {
- i = array[ull];
- if (unlikely(!i))
- break;
- if (i->i_ino == AUFS_ROOT_INO)
- continue;
-
- /* AuDbgInode(i); */
- if (au_iigen(i, NULL) == sigen)
- ii_read_lock_child(i);
- else {
- ii_write_lock_child(i);
- err = au_refresh_hinode_self(i);
- au_iigen_dec(i);
- if (!err)
- ii_downgrade_lock(i);
- else {
- ii_write_unlock(i);
- break;
- }
- }
-
- btop = au_ibtop(i);
- bbot = au_ibbot(i);
- if (btop <= bindex
- && bindex <= bbot
- && au_h_iptr(i, bindex)
- && au_test_ibusy(i, btop, bbot)) {
- err = -EBUSY;
- AuVerbose(verbose, "busy i%lu\n", i->i_ino);
- AuDbgInode(i);
- }
- ii_read_unlock(i);
- }
- au_iarray_free(array, max);
-
-out:
- return err;
-}
-
-static int test_children_busy(struct dentry *root, aufs_bindex_t bindex,
- const unsigned int verbose)
-{
- int err;
- unsigned int sigen;
-
- sigen = au_sigen(root->d_sb);
- DiMustNoWaiters(root);
- IiMustNoWaiters(d_inode(root));
- di_write_unlock(root);
- err = test_dentry_busy(root, bindex, sigen, verbose);
- if (!err)
- err = test_inode_busy(root->d_sb, bindex, sigen, verbose);
- di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
-
- return err;
-}
-
-static int test_dir_busy(struct file *file, aufs_bindex_t br_id,
- struct file **to_free, int *idx)
-{
- int err;
- unsigned char matched, root;
- aufs_bindex_t bindex, bbot;
- struct au_fidir *fidir;
- struct au_hfile *hfile;
-
- err = 0;
- root = IS_ROOT(file->f_path.dentry);
- if (root) {
- get_file(file);
- to_free[*idx] = file;
- (*idx)++;
- goto out;
- }
-
- matched = 0;
- fidir = au_fi(file)->fi_hdir;
- AuDebugOn(!fidir);
- bbot = au_fbbot_dir(file);
- for (bindex = au_fbtop(file); bindex <= bbot; bindex++) {
- hfile = fidir->fd_hfile + bindex;
- if (!hfile->hf_file)
- continue;
-
- if (hfile->hf_br->br_id == br_id) {
- matched = 1;
- break;
- }
- }
- if (matched)
- err = -EBUSY;
-
-out:
- return err;
-}
-
-static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id,
- struct file **to_free, int opened)
-{
- int err, idx;
- unsigned long long ull, max;
- aufs_bindex_t btop;
- struct file *file, **array;
- struct dentry *root;
- struct au_hfile *hfile;
-
- array = au_farray_alloc(sb, &max);
- err = PTR_ERR(array);
- if (IS_ERR(array))
- goto out;
-
- err = 0;
- idx = 0;
- root = sb->s_root;
- di_write_unlock(root);
- for (ull = 0; ull < max; ull++) {
- file = array[ull];
- if (unlikely(!file))
- break;
-
- /* AuDbg("%pD\n", file); */
- fi_read_lock(file);
- btop = au_fbtop(file);
- if (!d_is_dir(file->f_path.dentry)) {
- hfile = &au_fi(file)->fi_htop;
- if (hfile->hf_br->br_id == br_id)
- err = -EBUSY;
- } else
- err = test_dir_busy(file, br_id, to_free, &idx);
- fi_read_unlock(file);
- if (unlikely(err))
- break;
- }
- di_write_lock_child(root);
- au_farray_free(array, max);
- AuDebugOn(idx > opened);
-
-out:
- return err;
-}
-
-static void br_del_file(struct file **to_free, unsigned long long opened,
- aufs_bindex_t br_id)
-{
- unsigned long long ull;
- aufs_bindex_t bindex, btop, bbot, bfound;
- struct file *file;
- struct au_fidir *fidir;
- struct au_hfile *hfile;
-
- for (ull = 0; ull < opened; ull++) {
- file = to_free[ull];
- if (unlikely(!file))
- break;
-
- /* AuDbg("%pD\n", file); */
- AuDebugOn(!d_is_dir(file->f_path.dentry));
- bfound = -1;
- fidir = au_fi(file)->fi_hdir;
- AuDebugOn(!fidir);
- fi_write_lock(file);
- btop = au_fbtop(file);
- bbot = au_fbbot_dir(file);
- for (bindex = btop; bindex <= bbot; bindex++) {
- hfile = fidir->fd_hfile + bindex;
- if (!hfile->hf_file)
- continue;
-
- if (hfile->hf_br->br_id == br_id) {
- bfound = bindex;
- break;
- }
- }
- AuDebugOn(bfound < 0);
- au_set_h_fptr(file, bfound, NULL);
- if (bfound == btop) {
- for (btop++; btop <= bbot; btop++)
- if (au_hf_dir(file, btop)) {
- au_set_fbtop(file, btop);
- break;
- }
- }
- fi_write_unlock(file);
- }
-}
-
-static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
- const aufs_bindex_t bindex,
- const aufs_bindex_t bbot)
-{
- struct au_branch **brp, **p;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- brp = sbinfo->si_branch + bindex;
- if (bindex < bbot)
- memmove(brp, brp + 1, sizeof(*brp) * (bbot - bindex));
- sbinfo->si_branch[0 + bbot] = NULL;
- sbinfo->si_bbot--;
-
- p = au_krealloc(sbinfo->si_branch, sizeof(*p) * bbot, AuGFP_SBILIST,
- /*may_shrink*/1);
- if (p)
- sbinfo->si_branch = p;
- /* harmless error */
-}
-
-static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
- const aufs_bindex_t bbot)
-{
- struct au_hdentry *hdp, *p;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- hdp = au_hdentry(dinfo, bindex);
- if (bindex < bbot)
- memmove(hdp, hdp + 1, sizeof(*hdp) * (bbot - bindex));
- /* au_h_dentry_init(au_hdentry(dinfo, bbot); */
- dinfo->di_bbot--;
-
- p = au_krealloc(dinfo->di_hdentry, sizeof(*p) * bbot, AuGFP_SBILIST,
- /*may_shrink*/1);
- if (p)
- dinfo->di_hdentry = p;
- /* harmless error */
-}
-
-static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
- const aufs_bindex_t bbot)
-{
- struct au_hinode *hip, *p;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- hip = au_hinode(iinfo, bindex);
- if (bindex < bbot)
- memmove(hip, hip + 1, sizeof(*hip) * (bbot - bindex));
- /* au_hinode_init(au_hinode(iinfo, bbot)); */
- iinfo->ii_bbot--;
-
- p = au_krealloc(iinfo->ii_hinode, sizeof(*p) * bbot, AuGFP_SBILIST,
- /*may_shrink*/1);
- if (p)
- iinfo->ii_hinode = p;
- /* harmless error */
-}
-
-static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
- struct au_branch *br)
-{
- aufs_bindex_t bbot;
- struct au_sbinfo *sbinfo;
- struct dentry *root, *h_root;
- struct inode *inode, *h_inode;
- struct au_hinode *hinode;
-
- SiMustWriteLock(sb);
-
- root = sb->s_root;
- inode = d_inode(root);
- sbinfo = au_sbi(sb);
- bbot = sbinfo->si_bbot;
-
- h_root = au_h_dptr(root, bindex);
- hinode = au_hi(inode, bindex);
- h_inode = au_igrab(hinode->hi_inode);
- au_hiput(hinode);
-
- au_sbilist_lock();
- au_br_do_del_brp(sbinfo, bindex, bbot);
- au_br_do_del_hdp(au_di(root), bindex, bbot);
- au_br_do_del_hip(au_ii(inode), bindex, bbot);
- au_sbilist_unlock();
-
- dput(h_root);
- iput(h_inode);
- au_br_do_free(br);
-}
-
-static unsigned long long empty_cb(struct super_block *sb, void *array,
- unsigned long long max, void *arg)
-{
- return max;
-}
-
-int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
-{
- int err, rerr, i;
- unsigned long long opened;
- unsigned int mnt_flags;
- aufs_bindex_t bindex, bbot, br_id;
- unsigned char do_wh, verbose;
- struct au_branch *br;
- struct au_wbr *wbr;
- struct dentry *root;
- struct file **to_free;
-
- err = 0;
- opened = 0;
- to_free = NULL;
- root = sb->s_root;
- bindex = au_find_dbindex(root, del->h_path.dentry);
- if (bindex < 0) {
- if (remount)
- goto out; /* success */
- err = -ENOENT;
- pr_err("%s no such branch\n", del->pathname);
- goto out;
- }
- AuDbg("bindex b%d\n", bindex);
-
- err = -EBUSY;
- mnt_flags = au_mntflags(sb);
- verbose = !!au_opt_test(mnt_flags, VERBOSE);
- bbot = au_sbbot(sb);
- if (unlikely(!bbot)) {
- AuVerbose(verbose, "no more branches left\n");
- goto out;
- }
- br = au_sbr(sb, bindex);
- AuDebugOn(!path_equal(&br->br_path, &del->h_path));
-
- br_id = br->br_id;
- opened = au_br_count(br);
- if (unlikely(opened)) {
- to_free = au_array_alloc(&opened, empty_cb, sb, NULL);
- err = PTR_ERR(to_free);
- if (IS_ERR(to_free))
- goto out;
-
- err = test_file_busy(sb, br_id, to_free, opened);
- if (unlikely(err)) {
- AuVerbose(verbose, "%llu file(s) opened\n", opened);
- goto out;
- }
- }
-
- wbr = br->br_wbr;
- do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
- if (do_wh) {
- /* instead of WbrWhMustWriteLock(wbr) */
- SiMustWriteLock(sb);
- for (i = 0; i < AuBrWh_Last; i++) {
- dput(wbr->wbr_wh[i]);
- wbr->wbr_wh[i] = NULL;
- }
- }
-
- err = test_children_busy(root, bindex, verbose);
- if (unlikely(err)) {
- if (do_wh)
- goto out_wh;
- goto out;
- }
-
- err = 0;
- if (to_free) {
- /*
- * now we confirmed the branch is deletable.
- * let's free the remaining opened dirs on the branch.
- */
- di_write_unlock(root);
- br_del_file(to_free, opened, br_id);
- di_write_lock_child(root);
- }
-
- if (!remount)
- au_br_do_del(sb, bindex, br);
- else {
- sysaufs_brs_del(sb, bindex);
- au_br_do_del(sb, bindex, br);
- sysaufs_brs_add(sb, bindex);
- }
-
- if (!bindex) {
- au_cpup_attr_all(d_inode(root), /*force*/1);
- sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
- } else
- au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry));
- if (au_opt_test(mnt_flags, PLINK))
- au_plink_half_refresh(sb, br_id);
-
- if (au_xino_brid(sb) == br_id)
- au_xino_brid_set(sb, -1);
- goto out; /* success */
-
-out_wh:
- /* revert */
- rerr = au_br_init_wh(sb, br, br->br_perm);
- if (rerr)
- pr_warn("failed re-creating base whiteout, %s. (%d)\n",
- del->pathname, rerr);
-out:
- if (to_free)
- au_farray_free(to_free, opened);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg)
-{
- int err;
- aufs_bindex_t btop, bbot;
- struct aufs_ibusy ibusy;
- struct inode *inode, *h_inode;
-
- err = -EPERM;
- if (unlikely(!capable(CAP_SYS_ADMIN)))
- goto out;
-
- err = copy_from_user(&ibusy, arg, sizeof(ibusy));
- if (!err)
- err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
-
- err = -EINVAL;
- si_read_lock(sb, AuLock_FLUSH);
- if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbbot(sb)))
- goto out_unlock;
-
- err = 0;
- ibusy.h_ino = 0; /* invalid */
- inode = ilookup(sb, ibusy.ino);
- if (!inode
- || inode->i_ino == AUFS_ROOT_INO
- || au_is_bad_inode(inode))
- goto out_unlock;
-
- ii_read_lock_child(inode);
- btop = au_ibtop(inode);
- bbot = au_ibbot(inode);
- if (btop <= ibusy.bindex && ibusy.bindex <= bbot) {
- h_inode = au_h_iptr(inode, ibusy.bindex);
- if (h_inode && au_test_ibusy(inode, btop, bbot))
- ibusy.h_ino = h_inode->i_ino;
- }
- ii_read_unlock(inode);
- iput(inode);
-
-out_unlock:
- si_read_unlock(sb);
- if (!err) {
- err = __put_user(ibusy.h_ino, &arg->h_ino);
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- }
- }
-out:
- return err;
-}
-
-long au_ibusy_ioctl(struct file *file, unsigned long arg)
-{
- return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg);
-}
-
-#ifdef CONFIG_COMPAT
-long au_ibusy_compat_ioctl(struct file *file, unsigned long arg)
-{
- return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg));
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * change a branch permission
- */
-
-static void au_warn_ima(void)
-{
-#ifdef CONFIG_IMA
- /* since it doesn't support mark_files_ro() */
- AuWarn1("RW -> RO makes IMA to produce wrong message\n");
-#endif
-}
-
-static int do_need_sigen_inc(int a, int b)
-{
- return au_br_whable(a) && !au_br_whable(b);
-}
-
-static int need_sigen_inc(int old, int new)
-{
- return do_need_sigen_inc(old, new)
- || do_need_sigen_inc(new, old);
-}
-
-static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err, do_warn;
- unsigned int mnt_flags;
- unsigned long long ull, max;
- aufs_bindex_t br_id;
- unsigned char verbose, writer;
- struct file *file, *hf, **array;
- struct au_hfile *hfile;
-
- mnt_flags = au_mntflags(sb);
- verbose = !!au_opt_test(mnt_flags, VERBOSE);
-
- array = au_farray_alloc(sb, &max);
- err = PTR_ERR(array);
- if (IS_ERR(array))
- goto out;
-
- do_warn = 0;
- br_id = au_sbr_id(sb, bindex);
- for (ull = 0; ull < max; ull++) {
- file = array[ull];
- if (unlikely(!file))
- break;
-
- /* AuDbg("%pD\n", file); */
- fi_read_lock(file);
- if (unlikely(au_test_mmapped(file))) {
- err = -EBUSY;
- AuVerbose(verbose, "mmapped %pD\n", file);
- AuDbgFile(file);
- FiMustNoWaiters(file);
- fi_read_unlock(file);
- goto out_array;
- }
-
- hfile = &au_fi(file)->fi_htop;
- hf = hfile->hf_file;
- if (!d_is_reg(file->f_path.dentry)
- || !(file->f_mode & FMODE_WRITE)
- || hfile->hf_br->br_id != br_id
- || !(hf->f_mode & FMODE_WRITE))
- array[ull] = NULL;
- else {
- do_warn = 1;
- get_file(file);
- }
-
- FiMustNoWaiters(file);
- fi_read_unlock(file);
- fput(file);
- }
-
- err = 0;
- if (do_warn)
- au_warn_ima();
-
- for (ull = 0; ull < max; ull++) {
- file = array[ull];
- if (!file)
- continue;
-
- /* todo: already flushed? */
- /*
- * fs/super.c:mark_files_ro() is gone, but aufs keeps its
- * approach which resets f_mode and calls mnt_drop_write() and
- * file_release_write() for each file, because the branch
- * attribute in aufs world is totally different from the native
- * fs rw/ro mode.
- */
- /* fi_read_lock(file); */
- hfile = &au_fi(file)->fi_htop;
- hf = hfile->hf_file;
- /* fi_read_unlock(file); */
- spin_lock(&hf->f_lock);
- writer = !!(hf->f_mode & FMODE_WRITER);
- hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER);
- spin_unlock(&hf->f_lock);
- if (writer) {
- put_write_access(file_inode(hf));
- __mnt_drop_write(hf->f_path.mnt);
- }
- }
-
-out_array:
- au_farray_free(array, max);
-out:
- AuTraceErr(err);
- return err;
-}
-
-int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
- int *do_refresh)
-{
- int err, rerr;
- aufs_bindex_t bindex;
- struct dentry *root;
- struct au_branch *br;
- struct au_br_fhsm *bf;
-
- root = sb->s_root;
- bindex = au_find_dbindex(root, mod->h_root);
- if (bindex < 0) {
- if (remount)
- return 0; /* success */
- err = -ENOENT;
- pr_err("%s no such branch\n", mod->path);
- goto out;
- }
- AuDbg("bindex b%d\n", bindex);
-
- err = test_br(d_inode(mod->h_root), mod->perm, mod->path);
- if (unlikely(err))
- goto out;
-
- br = au_sbr(sb, bindex);
- AuDebugOn(mod->h_root != au_br_dentry(br));
- if (br->br_perm == mod->perm)
- return 0; /* success */
-
- /* pre-allocate for non-fhsm --> fhsm */
- bf = NULL;
- if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) {
- err = au_fhsm_br_alloc(br);
- if (unlikely(err))
- goto out;
- bf = br->br_fhsm;
- br->br_fhsm = NULL;
- }
-
- if (au_br_writable(br->br_perm)) {
- /* remove whiteout base */
- err = au_br_init_wh(sb, br, mod->perm);
- if (unlikely(err))
- goto out_bf;
-
- if (!au_br_writable(mod->perm)) {
- /* rw --> ro, file might be mmapped */
- DiMustNoWaiters(root);
- IiMustNoWaiters(d_inode(root));
- di_write_unlock(root);
- err = au_br_mod_files_ro(sb, bindex);
- /* aufs_write_lock() calls ..._child() */
- di_write_lock_child(root);
-
- if (unlikely(err)) {
- rerr = -ENOMEM;
- br->br_wbr = kzalloc(sizeof(*br->br_wbr),
- GFP_NOFS);
- if (br->br_wbr)
- rerr = au_wbr_init(br, sb, br->br_perm);
- if (unlikely(rerr)) {
- AuIOErr("nested error %d (%d)\n",
- rerr, err);
- br->br_perm = mod->perm;
- }
- }
- }
- } else if (au_br_writable(mod->perm)) {
- /* ro --> rw */
- err = -ENOMEM;
- br->br_wbr = kzalloc(sizeof(*br->br_wbr), GFP_NOFS);
- if (br->br_wbr) {
- err = au_wbr_init(br, sb, mod->perm);
- if (unlikely(err)) {
- au_delayed_kfree(br->br_wbr);
- br->br_wbr = NULL;
- }
- }
- }
- if (unlikely(err))
- goto out_bf;
-
- if (au_br_fhsm(br->br_perm)) {
- if (!au_br_fhsm(mod->perm)) {
- /* fhsm --> non-fhsm */
- au_br_fhsm_fin(br->br_fhsm);
- au_delayed_kfree(br->br_fhsm);
- br->br_fhsm = NULL;
- }
- } else if (au_br_fhsm(mod->perm))
- /* non-fhsm --> fhsm */
- br->br_fhsm = bf;
-
- *do_refresh |= need_sigen_inc(br->br_perm, mod->perm);
- br->br_perm = mod->perm;
- goto out; /* success */
-
-out_bf:
- if (bf)
- au_delayed_kfree(bf);
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs)
-{
- int err;
- struct kstatfs kstfs;
-
- err = vfs_statfs(&br->br_path, &kstfs);
- if (!err) {
- stfs->f_blocks = kstfs.f_blocks;
- stfs->f_bavail = kstfs.f_bavail;
- stfs->f_files = kstfs.f_files;
- stfs->f_ffree = kstfs.f_ffree;
- }
-
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * branch filesystems and xino for them
- */
-
-#ifndef __AUFS_BRANCH_H__
-#define __AUFS_BRANCH_H__
-
-#ifdef __KERNEL__
-
-#include <linux/mount.h>
-#include "dynop.h"
-#include "rwsem.h"
-#include "super.h"
-
-/* ---------------------------------------------------------------------- */
-
-/* a xino file */
-struct au_xino_file {
- struct file *xi_file;
- struct mutex xi_nondir_mtx;
-
- /* todo: make xino files an array to support huge inode number */
-
-#ifdef CONFIG_DEBUG_FS
- struct dentry *xi_dbgaufs;
-#endif
-};
-
-/* File-based Hierarchical Storage Management */
-struct au_br_fhsm {
-#ifdef CONFIG_AUFS_FHSM
- struct mutex bf_lock;
- unsigned long bf_jiffy;
- struct aufs_stfs bf_stfs;
- int bf_readable;
-#endif
-};
-
-/* members for writable branch only */
-enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
-struct au_wbr {
- struct au_rwsem wbr_wh_rwsem;
- struct dentry *wbr_wh[AuBrWh_Last];
- atomic_t wbr_wh_running;
-#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */
-#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */
-#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */
-
- /* mfs mode */
- unsigned long long wbr_bytes;
-};
-
-/* ext2 has 3 types of operations at least, ext3 has 4 */
-#define AuBrDynOp (AuDyLast * 4)
-
-#ifdef CONFIG_AUFS_HFSNOTIFY
-/* support for asynchronous destruction */
-struct au_br_hfsnotify {
- struct fsnotify_group *hfsn_group;
-};
-#endif
-
-/* sysfs entries */
-struct au_brsysfs {
- char name[16];
- struct attribute attr;
-};
-
-enum {
- AuBrSysfs_BR,
- AuBrSysfs_BRID,
- AuBrSysfs_Last
-};
-
-/* protected by superblock rwsem */
-struct au_branch {
- struct au_xino_file br_xino;
-
- aufs_bindex_t br_id;
-
- int br_perm;
- struct path br_path;
- spinlock_t br_dykey_lock;
- struct au_dykey *br_dykey[AuBrDynOp];
- struct percpu_counter br_count;
-
- struct au_wbr *br_wbr;
- struct au_br_fhsm *br_fhsm;
-
- /* xino truncation */
- atomic_t br_xino_running;
-
-#ifdef CONFIG_AUFS_HFSNOTIFY
- struct au_br_hfsnotify *br_hfsn;
-#endif
-
-#ifdef CONFIG_SYSFS
- /* entries under sysfs per mount-point */
- struct au_brsysfs br_sysfs[AuBrSysfs_Last];
-#endif
-};
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct vfsmount *au_br_mnt(struct au_branch *br)
-{
- return br->br_path.mnt;
-}
-
-static inline struct dentry *au_br_dentry(struct au_branch *br)
-{
- return br->br_path.dentry;
-}
-
-static inline struct super_block *au_br_sb(struct au_branch *br)
-{
- return au_br_mnt(br)->mnt_sb;
-}
-
-static inline void au_br_get(struct au_branch *br)
-{
- percpu_counter_inc(&br->br_count);
-}
-
-static inline void au_br_put(struct au_branch *br)
-{
- percpu_counter_dec(&br->br_count);
-}
-
-static inline s64 au_br_count(struct au_branch *br)
-{
- return percpu_counter_sum(&br->br_count);
-}
-
-static inline void au_br_count_init(struct au_branch *br)
-{
- percpu_counter_init(&br->br_count, 0, GFP_NOFS);
-}
-
-static inline void au_br_count_fin(struct au_branch *br)
-{
- percpu_counter_destroy(&br->br_count);
-}
-
-static inline int au_br_rdonly(struct au_branch *br)
-{
- return ((au_br_sb(br)->s_flags & MS_RDONLY)
- || !au_br_writable(br->br_perm))
- ? -EROFS : 0;
-}
-
-static inline int au_br_hnotifyable(int brperm __maybe_unused)
-{
-#ifdef CONFIG_AUFS_HNOTIFY
- return !(brperm & AuBrPerm_RR);
-#else
- return 0;
-#endif
-}
-
-static inline int au_br_test_oflag(int oflag, struct au_branch *br)
-{
- int err, exec_flag;
-
- err = 0;
- exec_flag = oflag & __FMODE_EXEC;
- if (unlikely(exec_flag && path_noexec(&br->br_path)))
- err = -EACCES;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* branch.c */
-struct au_sbinfo;
-void au_br_free(struct au_sbinfo *sinfo);
-int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
-struct au_opt_add;
-int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
-struct au_opt_del;
-int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
-long au_ibusy_ioctl(struct file *file, unsigned long arg);
-#ifdef CONFIG_COMPAT
-long au_ibusy_compat_ioctl(struct file *file, unsigned long arg);
-#endif
-struct au_opt_mod;
-int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
- int *do_refresh);
-struct aufs_stfs;
-int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs);
-
-/* xino.c */
-static const loff_t au_loff_max = LLONG_MAX;
-
-int au_xib_trunc(struct super_block *sb);
-ssize_t xino_fread(vfs_readf_t func, struct file *file, void *buf, size_t size,
- loff_t *pos);
-ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf,
- size_t size, loff_t *pos);
-struct file *au_xino_create2(struct file *base_file, struct file *copy_src);
-struct file *au_xino_create(struct super_block *sb, char *fname, int silent);
-ino_t au_xino_new_ino(struct super_block *sb);
-void au_xino_delete_inode(struct inode *inode, const int unlinked);
-int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino);
-int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t *ino);
-int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino,
- struct file *base_file, int do_test);
-int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex);
-
-struct au_opt_xino;
-int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount);
-void au_xino_clr(struct super_block *sb);
-struct file *au_xino_def(struct super_block *sb);
-int au_xino_path(struct seq_file *seq, struct file *file);
-
-/* ---------------------------------------------------------------------- */
-
-/* Superblock to branch */
-static inline
-aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr(sb, bindex)->br_id;
-}
-
-static inline
-struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_br_mnt(au_sbr(sb, bindex));
-}
-
-static inline
-struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_br_sb(au_sbr(sb, bindex));
-}
-
-static inline void au_sbr_get(struct super_block *sb, aufs_bindex_t bindex)
-{
- au_br_get(au_sbr(sb, bindex));
-}
-
-static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex)
-{
- au_br_put(au_sbr(sb, bindex));
-}
-
-static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_sbr(sb, bindex)->br_perm;
-}
-
-static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
-{
- return au_br_whable(au_sbr_perm(sb, bindex));
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * wbr_wh_read_lock, wbr_wh_write_lock
- * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock
- */
-AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem);
-
-#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem)
-#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem)
-#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_FHSM
-static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm)
-{
- mutex_init(&brfhsm->bf_lock);
- brfhsm->bf_jiffy = 0;
- brfhsm->bf_readable = 0;
-}
-
-static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm)
-{
- mutex_destroy(&brfhsm->bf_lock);
-}
-#else
-AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm)
-AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm)
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_BRANCH_H__ */
+++ /dev/null
-
-AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS}
-
-define AuConf
-ifdef ${1}
-AuConfStr += ${1}=${${1}}
-endif
-endef
-
-AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \
- SBILIST \
- HNOTIFY HFSNOTIFY \
- EXPORT INO_T_64 \
- XATTR \
- FHSM \
- RDU \
- SHWH \
- BR_RAMFS \
- BR_FUSE POLL \
- BR_HFSPLUS \
- BDEV_LOOP \
- DEBUG MAGIC_SYSRQ
-$(foreach i, ${AuConfAll}, \
- $(eval $(call AuConf,CONFIG_AUFS_${i})))
-
-AuConfName = ${obj}/conf.str
-${AuConfName}.tmp: FORCE
- @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@
-${AuConfName}: ${AuConfName}.tmp
- @diff -q $< $@ > /dev/null 2>&1 || { \
- echo ' GEN ' $@; \
- cp -p $< $@; \
- }
-FORCE:
-clean-files += ${AuConfName} ${AuConfName}.tmp
-${obj}/sysfs.o: ${AuConfName}
-
--include ${srctree}/${src}/conf_priv.mk
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * copy-up functions, see wbr_policy.c for copy-down
- */
-
-#include <linux/fs_stack.h>
-#include <linux/mm.h>
-#include <linux/task_work.h>
-#include "aufs.h"
-
-void au_cpup_attr_flags(struct inode *dst, unsigned int iflags)
-{
- const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
- | S_NOATIME | S_NOCMTIME | S_AUTOMOUNT;
-
- BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags));
-
- dst->i_flags |= iflags & ~mask;
- if (au_test_fs_notime(dst->i_sb))
- dst->i_flags |= S_NOATIME | S_NOCMTIME;
-}
-
-void au_cpup_attr_timesizes(struct inode *inode)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibtop(inode));
- fsstack_copy_attr_times(inode, h_inode);
- fsstack_copy_inode_size(inode, h_inode);
-}
-
-void au_cpup_attr_nlink(struct inode *inode, int force)
-{
- struct inode *h_inode;
- struct super_block *sb;
- aufs_bindex_t bindex, bbot;
-
- sb = inode->i_sb;
- bindex = au_ibtop(inode);
- h_inode = au_h_iptr(inode, bindex);
- if (!force
- && !S_ISDIR(h_inode->i_mode)
- && au_opt_test(au_mntflags(sb), PLINK)
- && au_plink_test(inode))
- return;
-
- /*
- * 0 can happen in revalidating.
- * h_inode->i_mutex may not be held here, but it is harmless since once
- * i_nlink reaches 0, it will never become positive except O_TMPFILE
- * case.
- * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause
- * the incorrect link count.
- */
- set_nlink(inode, h_inode->i_nlink);
-
- /*
- * fewer nlink makes find(1) noisy, but larger nlink doesn't.
- * it may includes whplink directory.
- */
- if (S_ISDIR(h_inode->i_mode)) {
- bbot = au_ibbot(inode);
- for (bindex++; bindex <= bbot; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (h_inode)
- au_add_nlink(inode, h_inode);
- }
- }
-}
-
-void au_cpup_attr_changeable(struct inode *inode)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibtop(inode));
- inode->i_mode = h_inode->i_mode;
- inode->i_uid = h_inode->i_uid;
- inode->i_gid = h_inode->i_gid;
- au_cpup_attr_timesizes(inode);
- au_cpup_attr_flags(inode, h_inode->i_flags);
-}
-
-void au_cpup_igen(struct inode *inode, struct inode *h_inode)
-{
- struct au_iinfo *iinfo = au_ii(inode);
-
- IiMustWriteLock(inode);
-
- iinfo->ii_higen = h_inode->i_generation;
- iinfo->ii_hsb1 = h_inode->i_sb;
-}
-
-void au_cpup_attr_all(struct inode *inode, int force)
-{
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, au_ibtop(inode));
- au_cpup_attr_changeable(inode);
- if (inode->i_nlink > 0)
- au_cpup_attr_nlink(inode, force);
- inode->i_rdev = h_inode->i_rdev;
- inode->i_blkbits = h_inode->i_blkbits;
- au_cpup_igen(inode, h_inode);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
-
-/* keep the timestamps of the parent dir when cpup */
-void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
- struct path *h_path)
-{
- struct inode *h_inode;
-
- dt->dt_dentry = dentry;
- dt->dt_h_path = *h_path;
- h_inode = d_inode(h_path->dentry);
- dt->dt_atime = h_inode->i_atime;
- dt->dt_mtime = h_inode->i_mtime;
- /* smp_mb(); */
-}
-
-void au_dtime_revert(struct au_dtime *dt)
-{
- struct iattr attr;
- int err;
-
- attr.ia_atime = dt->dt_atime;
- attr.ia_mtime = dt->dt_mtime;
- attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
- | ATTR_ATIME | ATTR_ATIME_SET;
-
- /* no delegation since this is a directory */
- err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL);
- if (unlikely(err))
- pr_warn("restoring timestamps failed(%d). ignored\n", err);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* internal use only */
-struct au_cpup_reg_attr {
- int valid;
- struct kstat st;
- unsigned int iflags; /* inode->i_flags */
-};
-
-static noinline_for_stack
-int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src,
- struct au_cpup_reg_attr *h_src_attr)
-{
- int err, sbits, icex;
- unsigned int mnt_flags;
- unsigned char verbose;
- struct iattr ia;
- struct path h_path;
- struct inode *h_isrc, *h_idst;
- struct kstat *h_st;
- struct au_branch *br;
-
- h_path.dentry = au_h_dptr(dst, bindex);
- h_idst = d_inode(h_path.dentry);
- br = au_sbr(dst->d_sb, bindex);
- h_path.mnt = au_br_mnt(br);
- h_isrc = d_inode(h_src);
- ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
- | ATTR_ATIME | ATTR_MTIME
- | ATTR_ATIME_SET | ATTR_MTIME_SET;
- if (h_src_attr && h_src_attr->valid) {
- h_st = &h_src_attr->st;
- ia.ia_uid = h_st->uid;
- ia.ia_gid = h_st->gid;
- ia.ia_atime = h_st->atime;
- ia.ia_mtime = h_st->mtime;
- if (h_idst->i_mode != h_st->mode
- && !S_ISLNK(h_idst->i_mode)) {
- ia.ia_valid |= ATTR_MODE;
- ia.ia_mode = h_st->mode;
- }
- sbits = !!(h_st->mode & (S_ISUID | S_ISGID));
- au_cpup_attr_flags(h_idst, h_src_attr->iflags);
- } else {
- ia.ia_uid = h_isrc->i_uid;
- ia.ia_gid = h_isrc->i_gid;
- ia.ia_atime = h_isrc->i_atime;
- ia.ia_mtime = h_isrc->i_mtime;
- if (h_idst->i_mode != h_isrc->i_mode
- && !S_ISLNK(h_idst->i_mode)) {
- ia.ia_valid |= ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- }
- sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
- au_cpup_attr_flags(h_idst, h_isrc->i_flags);
- }
- /* no delegation since it is just created */
- err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
-
- /* is this nfs only? */
- if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
- ia.ia_valid = ATTR_FORCE | ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
- }
-
- icex = br->br_perm & AuBrAttr_ICEX;
- if (!err) {
- mnt_flags = au_mntflags(dst->d_sb);
- verbose = !!au_opt_test(mnt_flags, VERBOSE);
- err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
- char *buf, unsigned long blksize)
-{
- int err;
- size_t sz, rbytes, wbytes;
- unsigned char all_zero;
- char *p, *zp;
- struct inode *h_inode;
- /* reduce stack usage */
- struct iattr *ia;
-
- zp = page_address(ZERO_PAGE(0));
- if (unlikely(!zp))
- return -ENOMEM; /* possible? */
-
- err = 0;
- all_zero = 0;
- while (len) {
- AuDbg("len %lld\n", len);
- sz = blksize;
- if (len < blksize)
- sz = len;
-
- rbytes = 0;
- /* todo: signal_pending? */
- while (!rbytes || err == -EAGAIN || err == -EINTR) {
- rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
- err = rbytes;
- }
- if (unlikely(err < 0))
- break;
-
- all_zero = 0;
- if (len >= rbytes && rbytes == blksize)
- all_zero = !memcmp(buf, zp, rbytes);
- if (!all_zero) {
- wbytes = rbytes;
- p = buf;
- while (wbytes) {
- size_t b;
-
- b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
- err = b;
- /* todo: signal_pending? */
- if (unlikely(err == -EAGAIN || err == -EINTR))
- continue;
- if (unlikely(err < 0))
- break;
- wbytes -= b;
- p += b;
- }
- if (unlikely(err < 0))
- break;
- } else {
- loff_t res;
-
- AuLabel(hole);
- res = vfsub_llseek(dst, rbytes, SEEK_CUR);
- err = res;
- if (unlikely(res < 0))
- break;
- }
- len -= rbytes;
- err = 0;
- }
-
- /* the last block may be a hole */
- if (!err && all_zero) {
- AuLabel(last hole);
-
- err = 1;
- if (au_test_nfs(dst->f_path.dentry->d_sb)) {
- /* nfs requires this step to make last hole */
- /* is this only nfs? */
- do {
- /* todo: signal_pending? */
- err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
- } while (err == -EAGAIN || err == -EINTR);
- if (err == 1)
- dst->f_pos--;
- }
-
- if (err == 1) {
- ia = (void *)buf;
- ia->ia_size = dst->f_pos;
- ia->ia_valid = ATTR_SIZE | ATTR_FILE;
- ia->ia_file = dst;
- h_inode = file_inode(dst);
- inode_lock_nested(h_inode, AuLsc_I_CHILD2);
- /* no delegation since it is just created */
- err = vfsub_notify_change(&dst->f_path, ia,
- /*delegated*/NULL);
- inode_unlock(h_inode);
- }
- }
-
- return err;
-}
-
-int au_copy_file(struct file *dst, struct file *src, loff_t len)
-{
- int err;
- unsigned long blksize;
- unsigned char do_kfree;
- char *buf;
-
- err = -ENOMEM;
- blksize = dst->f_path.dentry->d_sb->s_blocksize;
- if (!blksize || PAGE_SIZE < blksize)
- blksize = PAGE_SIZE;
- AuDbg("blksize %lu\n", blksize);
- do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
- if (do_kfree)
- buf = kmalloc(blksize, GFP_NOFS);
- else
- buf = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!buf))
- goto out;
-
- if (len > (1 << 22))
- AuDbg("copying a large file %lld\n", (long long)len);
-
- src->f_pos = 0;
- dst->f_pos = 0;
- err = au_do_copy_file(dst, src, len, buf, blksize);
- if (do_kfree)
- au_delayed_kfree(buf);
- else
- au_delayed_free_page((unsigned long)buf);
-
-out:
- return err;
-}
-
-/*
- * to support a sparse file which is opened with O_APPEND,
- * we need to close the file.
- */
-static int au_cp_regular(struct au_cp_generic *cpg)
-{
- int err, i;
- enum { SRC, DST };
- struct {
- aufs_bindex_t bindex;
- unsigned int flags;
- struct dentry *dentry;
- int force_wr;
- struct file *file;
- void *label;
- } *f, file[] = {
- {
- .bindex = cpg->bsrc,
- .flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
- .label = &&out
- },
- {
- .bindex = cpg->bdst,
- .flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
- .force_wr = !!au_ftest_cpup(cpg->flags, RWDST),
- .label = &&out_src
- }
- };
- struct super_block *sb;
- struct inode *h_src_inode;
- struct task_struct *tsk = current;
-
- /* bsrc branch can be ro/rw. */
- sb = cpg->dentry->d_sb;
- f = file;
- for (i = 0; i < 2; i++, f++) {
- f->dentry = au_h_dptr(cpg->dentry, f->bindex);
- f->file = au_h_open(cpg->dentry, f->bindex, f->flags,
- /*file*/NULL, f->force_wr);
- err = PTR_ERR(f->file);
- if (IS_ERR(f->file))
- goto *f->label;
- }
-
- /* try stopping to update while we copyup */
- h_src_inode = d_inode(file[SRC].dentry);
- if (!au_test_nfs(h_src_inode->i_sb))
- IMustLock(h_src_inode);
- err = au_copy_file(file[DST].file, file[SRC].file, cpg->len);
-
- /* i wonder if we had O_NO_DELAY_FPUT flag */
- if (tsk->flags & PF_KTHREAD)
- __fput_sync(file[DST].file);
- else {
- WARN(1, "%pD\nPlease report this warning to aufs-users ML",
- file[DST].file);
- fput(file[DST].file);
- /*
- * too bad.
- * we have to call both since we don't know which place the file
- * was added to.
- */
- task_work_run();
- flush_delayed_fput();
- }
- au_sbr_put(sb, file[DST].bindex);
-
-out_src:
- fput(file[SRC].file);
- au_sbr_put(sb, file[SRC].bindex);
-out:
- return err;
-}
-
-static int au_do_cpup_regular(struct au_cp_generic *cpg,
- struct au_cpup_reg_attr *h_src_attr)
-{
- int err, rerr;
- loff_t l;
- struct path h_path;
- struct inode *h_src_inode, *h_dst_inode;
-
- err = 0;
- h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc);
- l = i_size_read(h_src_inode);
- if (cpg->len == -1 || l < cpg->len)
- cpg->len = l;
- if (cpg->len) {
- /* try stopping to update while we are referencing */
- inode_lock_nested(h_src_inode, AuLsc_I_CHILD);
- au_pin_hdir_unlock(cpg->pin);
-
- h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
- h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc);
- h_src_attr->iflags = h_src_inode->i_flags;
- if (!au_test_nfs(h_src_inode->i_sb))
- err = vfs_getattr(&h_path, &h_src_attr->st);
- else {
- inode_unlock(h_src_inode);
- err = vfs_getattr(&h_path, &h_src_attr->st);
- inode_lock_nested(h_src_inode, AuLsc_I_CHILD);
- }
- if (unlikely(err)) {
- inode_unlock(h_src_inode);
- goto out;
- }
- h_src_attr->valid = 1;
- if (!au_test_nfs(h_src_inode->i_sb)) {
- err = au_cp_regular(cpg);
- inode_unlock(h_src_inode);
- } else {
- inode_unlock(h_src_inode);
- err = au_cp_regular(cpg);
- }
- rerr = au_pin_hdir_relock(cpg->pin);
- if (!err && rerr)
- err = rerr;
- }
- if (!err && (h_src_inode->i_state & I_LINKABLE)) {
- h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst);
- h_dst_inode = d_inode(h_path.dentry);
- spin_lock(&h_dst_inode->i_lock);
- h_dst_inode->i_state |= I_LINKABLE;
- spin_unlock(&h_dst_inode->i_lock);
- }
-
-out:
- return err;
-}
-
-static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
- struct inode *h_dir)
-{
- int err, symlen;
- mm_segment_t old_fs;
- union {
- char *k;
- char __user *u;
- } sym;
- struct inode *h_inode = d_inode(h_src);
- const struct inode_operations *h_iop = h_inode->i_op;
-
- err = -ENOSYS;
- if (unlikely(!h_iop->readlink))
- goto out;
-
- err = -ENOMEM;
- sym.k = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!sym.k))
- goto out;
-
- /* unnecessary to support mmap_sem since symlink is not mmap-able */
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- symlen = h_iop->readlink(h_src, sym.u, PATH_MAX);
- err = symlen;
- set_fs(old_fs);
-
- if (symlen > 0) {
- sym.k[symlen] = 0;
- err = vfsub_symlink(h_dir, h_path, sym.k);
- }
- au_delayed_free_page((unsigned long)sym.k);
-
-out:
- return err;
-}
-
-/*
- * regardless 'acl' option, reset all ACL.
- * All ACL will be copied up later from the original entry on the lower branch.
- */
-static int au_reset_acl(struct inode *h_dir, struct path *h_path, umode_t mode)
-{
- int err;
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- h_dentry = h_path->dentry;
- h_inode = d_inode(h_dentry);
- /* forget_all_cached_acls(h_inode)); */
- err = vfsub_removexattr(h_dentry, XATTR_NAME_POSIX_ACL_ACCESS);
- AuTraceErr(err);
- if (err == -EOPNOTSUPP)
- err = 0;
- if (!err)
- err = vfsub_acl_chmod(h_inode, mode);
-
- AuTraceErr(err);
- return err;
-}
-
-static int au_do_cpup_dir(struct au_cp_generic *cpg, struct dentry *dst_parent,
- struct inode *h_dir, struct path *h_path)
-{
- int err;
- struct inode *dir, *inode;
-
- err = vfsub_removexattr(h_path->dentry, XATTR_NAME_POSIX_ACL_DEFAULT);
- AuTraceErr(err);
- if (err == -EOPNOTSUPP)
- err = 0;
- if (unlikely(err))
- goto out;
-
- /*
- * strange behaviour from the users view,
- * particularry setattr case
- */
- dir = d_inode(dst_parent);
- if (au_ibtop(dir) == cpg->bdst)
- au_cpup_attr_nlink(dir, /*force*/1);
- inode = d_inode(cpg->dentry);
- au_cpup_attr_nlink(inode, /*force*/1);
-
-out:
- return err;
-}
-
-static noinline_for_stack
-int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent,
- struct au_cpup_reg_attr *h_src_attr)
-{
- int err;
- umode_t mode;
- unsigned int mnt_flags;
- unsigned char isdir, isreg, force;
- const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME);
- struct au_dtime dt;
- struct path h_path;
- struct dentry *h_src, *h_dst, *h_parent;
- struct inode *h_inode, *h_dir;
- struct super_block *sb;
-
- /* bsrc branch can be ro/rw. */
- h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
- h_inode = d_inode(h_src);
- AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc));
-
- /* try stopping to be referenced while we are creating */
- h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
- if (au_ftest_cpup(cpg->flags, RENAME))
- AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX,
- AUFS_WH_PFX_LEN));
- h_parent = h_dst->d_parent; /* dir inode is locked */
- h_dir = d_inode(h_parent);
- IMustLock(h_dir);
- AuDebugOn(h_parent != h_dst->d_parent);
-
- sb = cpg->dentry->d_sb;
- h_path.mnt = au_sbr_mnt(sb, cpg->bdst);
- if (do_dt) {
- h_path.dentry = h_parent;
- au_dtime_store(&dt, dst_parent, &h_path);
- }
- h_path.dentry = h_dst;
-
- isreg = 0;
- isdir = 0;
- mode = h_inode->i_mode;
- switch (mode & S_IFMT) {
- case S_IFREG:
- isreg = 1;
- err = vfsub_create(h_dir, &h_path, S_IRUSR | S_IWUSR,
- /*want_excl*/true);
- if (!err)
- err = au_do_cpup_regular(cpg, h_src_attr);
- break;
- case S_IFDIR:
- isdir = 1;
- err = vfsub_mkdir(h_dir, &h_path, mode);
- if (!err)
- err = au_do_cpup_dir(cpg, dst_parent, h_dir, &h_path);
- break;
- case S_IFLNK:
- err = au_do_cpup_symlink(&h_path, h_src, h_dir);
- break;
- case S_IFCHR:
- case S_IFBLK:
- AuDebugOn(!capable(CAP_MKNOD));
- /*FALLTHROUGH*/
- case S_IFIFO:
- case S_IFSOCK:
- err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
- break;
- default:
- AuIOErr("Unknown inode type 0%o\n", mode);
- err = -EIO;
- }
- if (!err)
- err = au_reset_acl(h_dir, &h_path, mode);
-
- mnt_flags = au_mntflags(sb);
- if (!au_opt_test(mnt_flags, UDBA_NONE)
- && !isdir
- && au_opt_test(mnt_flags, XINO)
- && (h_inode->i_nlink == 1
- || (h_inode->i_state & I_LINKABLE))
- /* todo: unnecessary? */
- /* && d_inode(cpg->dentry)->i_nlink == 1 */
- && cpg->bdst < cpg->bsrc
- && !au_ftest_cpup(cpg->flags, KEEPLINO))
- au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0);
- /* ignore this error */
-
- if (!err) {
- force = 0;
- if (isreg) {
- force = !!cpg->len;
- if (cpg->len == -1)
- force = !!i_size_read(h_inode);
- }
- au_fhsm_wrote(sb, cpg->bdst, force);
- }
-
- if (do_dt)
- au_dtime_revert(&dt);
- return err;
-}
-
-static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path)
-{
- int err;
- struct dentry *dentry, *h_dentry, *h_parent, *parent;
- struct inode *h_dir;
- aufs_bindex_t bdst;
-
- dentry = cpg->dentry;
- bdst = cpg->bdst;
- h_dentry = au_h_dptr(dentry, bdst);
- if (!au_ftest_cpup(cpg->flags, OVERWRITE)) {
- dget(h_dentry);
- au_set_h_dptr(dentry, bdst, NULL);
- err = au_lkup_neg(dentry, bdst, /*wh*/0);
- if (!err)
- h_path->dentry = dget(au_h_dptr(dentry, bdst));
- au_set_h_dptr(dentry, bdst, h_dentry);
- } else {
- err = 0;
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bdst);
- dput(parent);
- h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent);
- if (IS_ERR(h_path->dentry))
- err = PTR_ERR(h_path->dentry);
- }
- if (unlikely(err))
- goto out;
-
- h_parent = h_dentry->d_parent; /* dir inode is locked */
- h_dir = d_inode(h_parent);
- IMustLock(h_dir);
- AuDbg("%pd %pd\n", h_dentry, h_path->dentry);
- /* no delegation since it is just created */
- err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL);
- dput(h_path->dentry);
-
-out:
- return err;
-}
-
-/*
- * copyup the @dentry from @bsrc to @bdst.
- * the caller must set the both of lower dentries.
- * @len is for truncating when it is -1 copyup the entire file.
- * in link/rename cases, @dst_parent may be different from the real one.
- * basic->bsrc can be larger than basic->bdst.
- */
-static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
-{
- int err, rerr;
- aufs_bindex_t old_ibtop;
- unsigned char isdir, plink;
- struct dentry *h_src, *h_dst, *h_parent;
- struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode;
- struct super_block *sb;
- struct au_branch *br;
- /* to reuduce stack size */
- struct {
- struct au_dtime dt;
- struct path h_path;
- struct au_cpup_reg_attr h_src_attr;
- } *a;
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
- a->h_src_attr.valid = 0;
-
- sb = cpg->dentry->d_sb;
- br = au_sbr(sb, cpg->bdst);
- a->h_path.mnt = au_br_mnt(br);
- h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
- h_parent = h_dst->d_parent; /* dir inode is locked */
- h_dir = d_inode(h_parent);
- IMustLock(h_dir);
-
- h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
- inode = d_inode(cpg->dentry);
-
- if (!dst_parent)
- dst_parent = dget_parent(cpg->dentry);
- else
- dget(dst_parent);
-
- plink = !!au_opt_test(au_mntflags(sb), PLINK);
- dst_inode = au_h_iptr(inode, cpg->bdst);
- if (dst_inode) {
- if (unlikely(!plink)) {
- err = -EIO;
- AuIOErr("hi%lu(i%lu) exists on b%d "
- "but plink is disabled\n",
- dst_inode->i_ino, inode->i_ino, cpg->bdst);
- goto out_parent;
- }
-
- if (dst_inode->i_nlink) {
- const int do_dt = au_ftest_cpup(cpg->flags, DTIME);
-
- h_src = au_plink_lkup(inode, cpg->bdst);
- err = PTR_ERR(h_src);
- if (IS_ERR(h_src))
- goto out_parent;
- if (unlikely(d_is_negative(h_src))) {
- err = -EIO;
- AuIOErr("i%lu exists on b%d "
- "but not pseudo-linked\n",
- inode->i_ino, cpg->bdst);
- dput(h_src);
- goto out_parent;
- }
-
- if (do_dt) {
- a->h_path.dentry = h_parent;
- au_dtime_store(&a->dt, dst_parent, &a->h_path);
- }
-
- a->h_path.dentry = h_dst;
- delegated = NULL;
- err = vfsub_link(h_src, h_dir, &a->h_path, &delegated);
- if (!err && au_ftest_cpup(cpg->flags, RENAME))
- err = au_do_ren_after_cpup(cpg, &a->h_path);
- if (do_dt)
- au_dtime_revert(&a->dt);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- dput(h_src);
- goto out_parent;
- } else
- /* todo: cpup_wh_file? */
- /* udba work */
- au_update_ibrange(inode, /*do_put_zero*/1);
- }
-
- isdir = S_ISDIR(inode->i_mode);
- old_ibtop = au_ibtop(inode);
- err = cpup_entry(cpg, dst_parent, &a->h_src_attr);
- if (unlikely(err))
- goto out_rev;
- dst_inode = d_inode(h_dst);
- inode_lock_nested(dst_inode, AuLsc_I_CHILD2);
- /* todo: necessary? */
- /* au_pin_hdir_unlock(cpg->pin); */
-
- err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr);
- if (unlikely(err)) {
- /* todo: necessary? */
- /* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */
- inode_unlock(dst_inode);
- goto out_rev;
- }
-
- if (cpg->bdst < old_ibtop) {
- if (S_ISREG(inode->i_mode)) {
- err = au_dy_iaop(inode, cpg->bdst, dst_inode);
- if (unlikely(err)) {
- /* ignore an error */
- /* au_pin_hdir_relock(cpg->pin); */
- inode_unlock(dst_inode);
- goto out_rev;
- }
- }
- au_set_ibtop(inode, cpg->bdst);
- } else
- au_set_ibbot(inode, cpg->bdst);
- au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode),
- au_hi_flags(inode, isdir));
-
- /* todo: necessary? */
- /* err = au_pin_hdir_relock(cpg->pin); */
- inode_unlock(dst_inode);
- if (unlikely(err))
- goto out_rev;
-
- src_inode = d_inode(h_src);
- if (!isdir
- && (src_inode->i_nlink > 1
- || src_inode->i_state & I_LINKABLE)
- && plink)
- au_plink_append(inode, cpg->bdst, h_dst);
-
- if (au_ftest_cpup(cpg->flags, RENAME)) {
- a->h_path.dentry = h_dst;
- err = au_do_ren_after_cpup(cpg, &a->h_path);
- }
- if (!err)
- goto out_parent; /* success */
-
- /* revert */
-out_rev:
- a->h_path.dentry = h_parent;
- au_dtime_store(&a->dt, dst_parent, &a->h_path);
- a->h_path.dentry = h_dst;
- rerr = 0;
- if (d_is_positive(h_dst)) {
- if (!isdir) {
- /* no delegation since it is just created */
- rerr = vfsub_unlink(h_dir, &a->h_path,
- /*delegated*/NULL, /*force*/0);
- } else
- rerr = vfsub_rmdir(h_dir, &a->h_path);
- }
- au_dtime_revert(&a->dt);
- if (rerr) {
- AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
- err = -EIO;
- }
-out_parent:
- dput(dst_parent);
- au_delayed_kfree(a);
-out:
- return err;
-}
-
-#if 0 /* reserved */
-struct au_cpup_single_args {
- int *errp;
- struct au_cp_generic *cpg;
- struct dentry *dst_parent;
-};
-
-static void au_call_cpup_single(void *args)
-{
- struct au_cpup_single_args *a = args;
-
- au_pin_hdir_acquire_nest(a->cpg->pin);
- *a->errp = au_cpup_single(a->cpg, a->dst_parent);
- au_pin_hdir_release(a->cpg->pin);
-}
-#endif
-
-/*
- * prevent SIGXFSZ in copy-up.
- * testing CAP_MKNOD is for generic fs,
- * but CAP_FSETID is for xfs only, currently.
- */
-static int au_cpup_sio_test(struct au_pin *pin, umode_t mode)
-{
- int do_sio;
- struct super_block *sb;
- struct inode *h_dir;
-
- do_sio = 0;
- sb = au_pinned_parent(pin)->d_sb;
- if (!au_wkq_test()
- && (!au_sbi(sb)->si_plink_maint_pid
- || au_plink_maint(sb, AuLock_NOPLM))) {
- switch (mode & S_IFMT) {
- case S_IFREG:
- /* no condition about RLIMIT_FSIZE and the file size */
- do_sio = 1;
- break;
- case S_IFCHR:
- case S_IFBLK:
- do_sio = !capable(CAP_MKNOD);
- break;
- }
- if (!do_sio)
- do_sio = ((mode & (S_ISUID | S_ISGID))
- && !capable(CAP_FSETID));
- /* this workaround may be removed in the future */
- if (!do_sio) {
- h_dir = au_pinned_h_dir(pin);
- do_sio = h_dir->i_mode & S_ISVTX;
- }
- }
-
- return do_sio;
-}
-
-#if 0 /* reserved */
-int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
-{
- int err, wkq_err;
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
- if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode))
- err = au_cpup_single(cpg, dst_parent);
- else {
- struct au_cpup_single_args args = {
- .errp = &err,
- .cpg = cpg,
- .dst_parent = dst_parent
- };
- wkq_err = au_wkq_wait(au_call_cpup_single, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-#endif
-
-/*
- * copyup the @dentry from the first active lower branch to @bdst,
- * using au_cpup_single().
- */
-static int au_cpup_simple(struct au_cp_generic *cpg)
-{
- int err;
- unsigned int flags_orig;
- struct dentry *dentry;
-
- AuDebugOn(cpg->bsrc < 0);
-
- dentry = cpg->dentry;
- DiMustWriteLock(dentry);
-
- err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1);
- if (!err) {
- flags_orig = cpg->flags;
- au_fset_cpup(cpg->flags, RENAME);
- err = au_cpup_single(cpg, NULL);
- cpg->flags = flags_orig;
- if (!err)
- return 0; /* success */
-
- /* revert */
- au_set_h_dptr(dentry, cpg->bdst, NULL);
- au_set_dbtop(dentry, cpg->bsrc);
- }
-
- return err;
-}
-
-struct au_cpup_simple_args {
- int *errp;
- struct au_cp_generic *cpg;
-};
-
-static void au_call_cpup_simple(void *args)
-{
- struct au_cpup_simple_args *a = args;
-
- au_pin_hdir_acquire_nest(a->cpg->pin);
- *a->errp = au_cpup_simple(a->cpg);
- au_pin_hdir_release(a->cpg->pin);
-}
-
-static int au_do_sio_cpup_simple(struct au_cp_generic *cpg)
-{
- int err, wkq_err;
- struct dentry *dentry, *parent;
- struct file *h_file;
- struct inode *h_dir;
-
- dentry = cpg->dentry;
- h_file = NULL;
- if (au_ftest_cpup(cpg->flags, HOPEN)) {
- AuDebugOn(cpg->bsrc < 0);
- h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
- }
-
- parent = dget_parent(dentry);
- h_dir = au_h_iptr(d_inode(parent), cpg->bdst);
- if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE)
- && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
- err = au_cpup_simple(cpg);
- else {
- struct au_cpup_simple_args args = {
- .errp = &err,
- .cpg = cpg
- };
- wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- dput(parent);
- if (h_file)
- au_h_open_post(dentry, cpg->bsrc, h_file);
-
-out:
- return err;
-}
-
-int au_sio_cpup_simple(struct au_cp_generic *cpg)
-{
- aufs_bindex_t bsrc, bbot;
- struct dentry *dentry, *h_dentry;
-
- if (cpg->bsrc < 0) {
- dentry = cpg->dentry;
- bbot = au_dbbot(dentry);
- for (bsrc = cpg->bdst + 1; bsrc <= bbot; bsrc++) {
- h_dentry = au_h_dptr(dentry, bsrc);
- if (h_dentry) {
- AuDebugOn(d_is_negative(h_dentry));
- break;
- }
- }
- AuDebugOn(bsrc > bbot);
- cpg->bsrc = bsrc;
- }
- AuDebugOn(cpg->bsrc <= cpg->bdst);
- return au_do_sio_cpup_simple(cpg);
-}
-
-int au_sio_cpdown_simple(struct au_cp_generic *cpg)
-{
- AuDebugOn(cpg->bdst <= cpg->bsrc);
- return au_do_sio_cpup_simple(cpg);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * copyup the deleted file for writing.
- */
-static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry,
- struct file *file)
-{
- int err;
- unsigned int flags_orig;
- aufs_bindex_t bsrc_orig;
- struct au_dinfo *dinfo;
- struct {
- struct au_hdentry *hd;
- struct dentry *h_dentry;
- } hdst, hsrc;
-
- dinfo = au_di(cpg->dentry);
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- bsrc_orig = cpg->bsrc;
- cpg->bsrc = dinfo->di_btop;
- hdst.hd = au_hdentry(dinfo, cpg->bdst);
- hdst.h_dentry = hdst.hd->hd_dentry;
- hdst.hd->hd_dentry = wh_dentry;
- dinfo->di_btop = cpg->bdst;
-
- hsrc.h_dentry = NULL;
- if (file) {
- hsrc.hd = au_hdentry(dinfo, cpg->bsrc);
- hsrc.h_dentry = hsrc.hd->hd_dentry;
- hsrc.hd->hd_dentry = au_hf_top(file)->f_path.dentry;
- }
- flags_orig = cpg->flags;
- cpg->flags = !AuCpup_DTIME;
- err = au_cpup_single(cpg, /*h_parent*/NULL);
- cpg->flags = flags_orig;
- if (file) {
- if (!err)
- err = au_reopen_nondir(file);
- hsrc.hd->hd_dentry = hsrc.h_dentry;
- }
- hdst.hd->hd_dentry = hdst.h_dentry;
- dinfo->di_btop = cpg->bsrc;
- cpg->bsrc = bsrc_orig;
-
- return err;
-}
-
-static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file)
-{
- int err;
- aufs_bindex_t bdst;
- struct au_dtime dt;
- struct dentry *dentry, *parent, *h_parent, *wh_dentry;
- struct au_branch *br;
- struct path h_path;
-
- dentry = cpg->dentry;
- bdst = cpg->bdst;
- br = au_sbr(dentry->d_sb, bdst);
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bdst);
- wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out;
-
- h_path.dentry = h_parent;
- h_path.mnt = au_br_mnt(br);
- au_dtime_store(&dt, parent, &h_path);
- err = au_do_cpup_wh(cpg, wh_dentry, file);
- if (unlikely(err))
- goto out_wh;
-
- dget(wh_dentry);
- h_path.dentry = wh_dentry;
- if (!d_is_dir(wh_dentry)) {
- /* no delegation since it is just created */
- err = vfsub_unlink(d_inode(h_parent), &h_path,
- /*delegated*/NULL, /*force*/0);
- } else
- err = vfsub_rmdir(d_inode(h_parent), &h_path);
- if (unlikely(err)) {
- AuIOErr("failed remove copied-up tmp file %pd(%d)\n",
- wh_dentry, err);
- err = -EIO;
- }
- au_dtime_revert(&dt);
- au_set_hi_wh(d_inode(dentry), bdst, wh_dentry);
-
-out_wh:
- dput(wh_dentry);
-out:
- dput(parent);
- return err;
-}
-
-struct au_cpup_wh_args {
- int *errp;
- struct au_cp_generic *cpg;
- struct file *file;
-};
-
-static void au_call_cpup_wh(void *args)
-{
- struct au_cpup_wh_args *a = args;
-
- au_pin_hdir_acquire_nest(a->cpg->pin);
- *a->errp = au_cpup_wh(a->cpg, a->file);
- au_pin_hdir_release(a->cpg->pin);
-}
-
-int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file)
-{
- int err, wkq_err;
- aufs_bindex_t bdst;
- struct dentry *dentry, *parent, *h_orph, *h_parent;
- struct inode *dir, *h_dir, *h_tmpdir;
- struct au_wbr *wbr;
- struct au_pin wh_pin, *pin_orig;
-
- dentry = cpg->dentry;
- bdst = cpg->bdst;
- parent = dget_parent(dentry);
- dir = d_inode(parent);
- h_orph = NULL;
- h_parent = NULL;
- h_dir = au_igrab(au_h_iptr(dir, bdst));
- h_tmpdir = h_dir;
- pin_orig = NULL;
- if (!h_dir->i_nlink) {
- wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
- h_orph = wbr->wbr_orph;
-
- h_parent = dget(au_h_dptr(parent, bdst));
- au_set_h_dptr(parent, bdst, dget(h_orph));
- h_tmpdir = d_inode(h_orph);
- au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
-
- inode_lock_nested(h_tmpdir, AuLsc_I_PARENT3);
- /* todo: au_h_open_pre()? */
-
- pin_orig = cpg->pin;
- au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT,
- AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED);
- cpg->pin = &wh_pin;
- }
-
- if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE)
- && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
- err = au_cpup_wh(cpg, file);
- else {
- struct au_cpup_wh_args args = {
- .errp = &err,
- .cpg = cpg,
- .file = file
- };
- wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- if (h_orph) {
- inode_unlock(h_tmpdir);
- /* todo: au_h_open_post()? */
- au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
- au_set_h_dptr(parent, bdst, h_parent);
- AuDebugOn(!pin_orig);
- cpg->pin = pin_orig;
- }
- iput(h_dir);
- dput(parent);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * generic routine for both of copy-up and copy-down.
- */
-/* cf. revalidate function in file.c */
-int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
- int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
- struct au_pin *pin,
- struct dentry *h_parent, void *arg),
- void *arg)
-{
- int err;
- struct au_pin pin;
- struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry;
-
- err = 0;
- parent = dget_parent(dentry);
- if (IS_ROOT(parent))
- goto out;
-
- au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
- au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
-
- /* do not use au_dpage */
- real_parent = parent;
- while (1) {
- dput(parent);
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bdst);
- if (h_parent)
- goto out; /* success */
-
- /* find top dir which is necessary to cpup */
- do {
- d = parent;
- dput(parent);
- parent = dget_parent(d);
- di_read_lock_parent3(parent, !AuLock_IR);
- h_parent = au_h_dptr(parent, bdst);
- di_read_unlock(parent, !AuLock_IR);
- } while (!h_parent);
-
- if (d != real_parent)
- di_write_lock_child3(d);
-
- /* somebody else might create while we were sleeping */
- h_dentry = au_h_dptr(d, bdst);
- if (!h_dentry || d_is_negative(h_dentry)) {
- if (h_dentry)
- au_update_dbtop(d);
-
- au_pin_set_dentry(&pin, d);
- err = au_do_pin(&pin);
- if (!err) {
- err = cp(d, bdst, &pin, h_parent, arg);
- au_unpin(&pin);
- }
- }
-
- if (d != real_parent)
- di_write_unlock(d);
- if (unlikely(err))
- break;
- }
-
-out:
- dput(parent);
- return err;
-}
-
-static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
- struct au_pin *pin,
- struct dentry *h_parent __maybe_unused,
- void *arg __maybe_unused)
-{
- struct au_cp_generic cpg = {
- .dentry = dentry,
- .bdst = bdst,
- .bsrc = -1,
- .len = 0,
- .pin = pin,
- .flags = AuCpup_DTIME
- };
- return au_sio_cpup_simple(&cpg);
-}
-
-int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
-}
-
-int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- int err;
- struct dentry *parent;
- struct inode *dir;
-
- parent = dget_parent(dentry);
- dir = d_inode(parent);
- err = 0;
- if (au_h_iptr(dir, bdst))
- goto out;
-
- di_read_unlock(parent, AuLock_IR);
- di_write_lock_parent(parent);
- /* someone else might change our inode while we were sleeping */
- if (!au_h_iptr(dir, bdst))
- err = au_cpup_dirs(dentry, bdst);
- di_downgrade_lock(parent, AuLock_IR);
-
-out:
- dput(parent);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * copy-up/down functions
- */
-
-#ifndef __AUFS_CPUP_H__
-#define __AUFS_CPUP_H__
-
-#ifdef __KERNEL__
-
-#include <linux/path.h>
-
-struct inode;
-struct file;
-struct au_pin;
-
-void au_cpup_attr_flags(struct inode *dst, unsigned int iflags);
-void au_cpup_attr_timesizes(struct inode *inode);
-void au_cpup_attr_nlink(struct inode *inode, int force);
-void au_cpup_attr_changeable(struct inode *inode);
-void au_cpup_igen(struct inode *inode, struct inode *h_inode);
-void au_cpup_attr_all(struct inode *inode, int force);
-
-/* ---------------------------------------------------------------------- */
-
-struct au_cp_generic {
- struct dentry *dentry;
- aufs_bindex_t bdst, bsrc;
- loff_t len;
- struct au_pin *pin;
- unsigned int flags;
-};
-
-/* cpup flags */
-#define AuCpup_DTIME 1 /* do dtime_store/revert */
-#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino,
- for link(2) */
-#define AuCpup_RENAME (1 << 2) /* rename after cpup */
-#define AuCpup_HOPEN (1 << 3) /* call h_open_pre/post() in
- cpup */
-#define AuCpup_OVERWRITE (1 << 4) /* allow overwriting the
- existing entry */
-#define AuCpup_RWDST (1 << 5) /* force write target even if
- the branch is marked as RO */
-
-#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name)
-#define au_fset_cpup(flags, name) \
- do { (flags) |= AuCpup_##name; } while (0)
-#define au_fclr_cpup(flags, name) \
- do { (flags) &= ~AuCpup_##name; } while (0)
-
-int au_copy_file(struct file *dst, struct file *src, loff_t len);
-int au_sio_cpup_simple(struct au_cp_generic *cpg);
-int au_sio_cpdown_simple(struct au_cp_generic *cpg);
-int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file);
-
-int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
- int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
- struct au_pin *pin,
- struct dentry *h_parent, void *arg),
- void *arg);
-int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-
-/* ---------------------------------------------------------------------- */
-
-/* keep timestamps when copyup */
-struct au_dtime {
- struct dentry *dt_dentry;
- struct path dt_h_path;
- struct timespec dt_atime, dt_mtime;
-};
-void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
- struct path *h_path);
-void au_dtime_revert(struct au_dtime *dt);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_CPUP_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * debugfs interface
- */
-
-#include <linux/debugfs.h>
-#include "aufs.h"
-
-#ifndef CONFIG_SYSFS
-#error DEBUG_FS depends upon SYSFS
-#endif
-
-static struct dentry *dbgaufs;
-static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;
-
-/* 20 is max digits length of ulong 64 */
-struct dbgaufs_arg {
- int n;
- char a[20 * 4];
-};
-
-/*
- * common function for all XINO files
- */
-static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
- struct file *file)
-{
- au_delayed_kfree(file->private_data);
- return 0;
-}
-
-static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
-{
- int err;
- struct kstat st;
- struct dbgaufs_arg *p;
-
- err = -ENOMEM;
- p = kmalloc(sizeof(*p), GFP_NOFS);
- if (unlikely(!p))
- goto out;
-
- err = 0;
- p->n = 0;
- file->private_data = p;
- if (!xf)
- goto out;
-
- err = vfs_getattr(&xf->f_path, &st);
- if (!err) {
- if (do_fcnt)
- p->n = snprintf
- (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n",
- (long)file_count(xf), st.blocks, st.blksize,
- (long long)st.size);
- else
- p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n",
- st.blocks, st.blksize,
- (long long)st.size);
- AuDebugOn(p->n >= sizeof(p->a));
- } else {
- p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
- err = 0;
- }
-
-out:
- return err;
-
-}
-
-static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct dbgaufs_arg *p;
-
- p = file->private_data;
- return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dbgaufs_plink_arg {
- int n;
- char a[];
-};
-
-static int dbgaufs_plink_release(struct inode *inode __maybe_unused,
- struct file *file)
-{
- au_delayed_free_page((unsigned long)file->private_data);
- return 0;
-}
-
-static int dbgaufs_plink_open(struct inode *inode, struct file *file)
-{
- int err, i, limit;
- unsigned long n, sum;
- struct dbgaufs_plink_arg *p;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct au_sphlhead *sphl;
-
- err = -ENOMEM;
- p = (void *)get_zeroed_page(GFP_NOFS);
- if (unlikely(!p))
- goto out;
-
- err = -EFBIG;
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- if (au_opt_test(au_mntflags(sb), PLINK)) {
- limit = PAGE_SIZE - sizeof(p->n);
-
- /* the number of buckets */
- n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH);
- p->n += n;
- limit -= n;
-
- sum = 0;
- for (i = 0, sphl = sbinfo->si_plink;
- i < AuPlink_NHASH;
- i++, sphl++) {
- n = au_sphl_count(sphl);
- sum += n;
-
- n = snprintf(p->a + p->n, limit, "%lu ", n);
- p->n += n;
- limit -= n;
- if (unlikely(limit <= 0))
- goto out_free;
- }
- p->a[p->n - 1] = '\n';
-
- /* the sum of plinks */
- n = snprintf(p->a + p->n, limit, "%lu\n", sum);
- p->n += n;
- limit -= n;
- if (unlikely(limit <= 0))
- goto out_free;
- } else {
-#define str "1\n0\n0\n"
- p->n = sizeof(str) - 1;
- strcpy(p->a, str);
-#undef str
- }
- si_read_unlock(sb);
-
- err = 0;
- file->private_data = p;
- goto out; /* success */
-
-out_free:
- au_delayed_free_page((unsigned long)p);
-out:
- return err;
-}
-
-static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct dbgaufs_plink_arg *p;
-
- p = file->private_data;
- return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
-}
-
-static const struct file_operations dbgaufs_plink_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_plink_open,
- .release = dbgaufs_plink_release,
- .read = dbgaufs_plink_read
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int dbgaufs_xib_open(struct inode *inode, struct file *file)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
- si_read_unlock(sb);
- return err;
-}
-
-static const struct file_operations dbgaufs_xib_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xib_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-/* ---------------------------------------------------------------------- */
-
-#define DbgaufsXi_PREFIX "xi"
-
-static int dbgaufs_xino_open(struct inode *inode, struct file *file)
-{
- int err;
- long l;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct file *xf;
- struct qstr *name;
-
- err = -ENOENT;
- xf = NULL;
- name = &file->f_path.dentry->d_name;
- if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
- || memcmp(name->name, DbgaufsXi_PREFIX,
- sizeof(DbgaufsXi_PREFIX) - 1)))
- goto out;
- err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
- if (unlikely(err))
- goto out;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- if (l <= au_sbbot(sb)) {
- xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
- err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
- } else
- err = -ENOENT;
- si_read_unlock(sb);
-
-out:
- return err;
-}
-
-static const struct file_operations dbgaufs_xino_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xino_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-{
- aufs_bindex_t bbot;
- struct au_branch *br;
- struct au_xino_file *xi;
-
- if (!au_sbi(sb)->si_dbgaufs)
- return;
-
- bbot = au_sbbot(sb);
- for (; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- xi = &br->br_xino;
- /* debugfs acquires the parent i_mutex */
- lockdep_off();
- debugfs_remove(xi->xi_dbgaufs);
- lockdep_on();
- xi->xi_dbgaufs = NULL;
- }
-}
-
-void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_sbinfo *sbinfo;
- struct dentry *parent;
- struct au_branch *br;
- struct au_xino_file *xi;
- aufs_bindex_t bbot;
- char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
-
- sbinfo = au_sbi(sb);
- parent = sbinfo->si_dbgaufs;
- if (!parent)
- return;
-
- bbot = au_sbbot(sb);
- for (; bindex <= bbot; bindex++) {
- snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
- br = au_sbr(sb, bindex);
- xi = &br->br_xino;
- AuDebugOn(xi->xi_dbgaufs);
- /* debugfs acquires the parent i_mutex */
- lockdep_off();
- xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
- sbinfo, &dbgaufs_xino_fop);
- lockdep_on();
- /* ignore an error */
- if (unlikely(!xi->xi_dbgaufs))
- AuWarn1("failed %s under debugfs\n", name);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_EXPORT
-static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
-
- sbinfo = inode->i_private;
- sb = sbinfo->si_sb;
- si_noflush_read_lock(sb);
- err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
- si_read_unlock(sb);
- return err;
-}
-
-static const struct file_operations dbgaufs_xigen_fop = {
- .owner = THIS_MODULE,
- .open = dbgaufs_xigen_open,
- .release = dbgaufs_xi_release,
- .read = dbgaufs_xi_read
-};
-
-static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-{
- int err;
-
- /*
- * This function is a dynamic '__init' function actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- err = -EIO;
- sbinfo->si_dbgaufs_xigen = debugfs_create_file
- ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
- &dbgaufs_xigen_fop);
- if (sbinfo->si_dbgaufs_xigen)
- err = 0;
-
- return err;
-}
-#else
-static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-{
- return 0;
-}
-#endif /* CONFIG_AUFS_EXPORT */
-
-/* ---------------------------------------------------------------------- */
-
-void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
-{
- /*
- * This function is a dynamic '__fin' function actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- debugfs_remove_recursive(sbinfo->si_dbgaufs);
- sbinfo->si_dbgaufs = NULL;
- kobject_put(&sbinfo->si_kobj);
-}
-
-int dbgaufs_si_init(struct au_sbinfo *sbinfo)
-{
- int err;
- char name[SysaufsSiNameLen];
-
- /*
- * This function is a dynamic '__init' function actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-
- err = -ENOENT;
- if (!dbgaufs) {
- AuErr1("/debug/aufs is uninitialized\n");
- goto out;
- }
-
- err = -EIO;
- sysaufs_name(sbinfo, name);
- sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
- if (unlikely(!sbinfo->si_dbgaufs))
- goto out;
- kobject_get(&sbinfo->si_kobj);
-
- sbinfo->si_dbgaufs_xib = debugfs_create_file
- ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
- &dbgaufs_xib_fop);
- if (unlikely(!sbinfo->si_dbgaufs_xib))
- goto out_dir;
-
- sbinfo->si_dbgaufs_plink = debugfs_create_file
- ("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
- &dbgaufs_plink_fop);
- if (unlikely(!sbinfo->si_dbgaufs_plink))
- goto out_dir;
-
- err = dbgaufs_xigen_init(sbinfo);
- if (!err)
- goto out; /* success */
-
-out_dir:
- dbgaufs_si_fin(sbinfo);
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void dbgaufs_fin(void)
-{
- debugfs_remove(dbgaufs);
-}
-
-int __init dbgaufs_init(void)
-{
- int err;
-
- err = -EIO;
- dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
- if (dbgaufs)
- err = 0;
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * debugfs interface
- */
-
-#ifndef __DBGAUFS_H__
-#define __DBGAUFS_H__
-
-#ifdef __KERNEL__
-
-struct super_block;
-struct au_sbinfo;
-
-#ifdef CONFIG_DEBUG_FS
-/* dbgaufs.c */
-void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-void dbgaufs_si_fin(struct au_sbinfo *sbinfo);
-int dbgaufs_si_init(struct au_sbinfo *sbinfo);
-void dbgaufs_fin(void);
-int __init dbgaufs_init(void);
-#else
-AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo)
-AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo)
-AuStubVoid(dbgaufs_fin, void)
-AuStubInt0(__init dbgaufs_init, void)
-#endif /* CONFIG_DEBUG_FS */
-
-#endif /* __KERNEL__ */
-#endif /* __DBGAUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for dentry cache
- */
-
-#include "aufs.h"
-
-static void au_dpage_free(struct au_dpage *dpage)
-{
- int i;
- struct dentry **p;
-
- p = dpage->dentries;
- for (i = 0; i < dpage->ndentry; i++)
- dput(*p++);
- au_delayed_free_page((unsigned long)dpage->dentries);
-}
-
-int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
-{
- int err;
- void *p;
-
- err = -ENOMEM;
- dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
- if (unlikely(!dpages->dpages))
- goto out;
-
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out_dpages;
-
- dpages->dpages[0].ndentry = 0;
- dpages->dpages[0].dentries = p;
- dpages->ndpage = 1;
- return 0; /* success */
-
-out_dpages:
- au_delayed_kfree(dpages->dpages);
-out:
- return err;
-}
-
-void au_dpages_free(struct au_dcsub_pages *dpages)
-{
- int i;
- struct au_dpage *p;
-
- p = dpages->dpages;
- for (i = 0; i < dpages->ndpage; i++)
- au_dpage_free(p++);
- au_delayed_kfree(dpages->dpages);
-}
-
-static int au_dpages_append(struct au_dcsub_pages *dpages,
- struct dentry *dentry, gfp_t gfp)
-{
- int err, sz;
- struct au_dpage *dpage;
- void *p;
-
- dpage = dpages->dpages + dpages->ndpage - 1;
- sz = PAGE_SIZE / sizeof(dentry);
- if (unlikely(dpage->ndentry >= sz)) {
- AuLabel(new dpage);
- err = -ENOMEM;
- sz = dpages->ndpage * sizeof(*dpages->dpages);
- p = au_kzrealloc(dpages->dpages, sz,
- sz + sizeof(*dpages->dpages), gfp,
- /*may_shrink*/0);
- if (unlikely(!p))
- goto out;
-
- dpages->dpages = p;
- dpage = dpages->dpages + dpages->ndpage;
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out;
-
- dpage->ndentry = 0;
- dpage->dentries = p;
- dpages->ndpage++;
- }
-
- AuDebugOn(au_dcount(dentry) <= 0);
- dpage->dentries[dpage->ndentry++] = dget_dlock(dentry);
- return 0; /* success */
-
-out:
- return err;
-}
-
-/* todo: BAD approach */
-/* copied from linux/fs/dcache.c */
-enum d_walk_ret {
- D_WALK_CONTINUE,
- D_WALK_QUIT,
- D_WALK_NORETRY,
- D_WALK_SKIP,
-};
-
-extern void d_walk(struct dentry *parent, void *data,
- enum d_walk_ret (*enter)(void *, struct dentry *),
- void (*finish)(void *));
-
-struct ac_dpages_arg {
- int err;
- struct au_dcsub_pages *dpages;
- struct super_block *sb;
- au_dpages_test test;
- void *arg;
-};
-
-static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry)
-{
- enum d_walk_ret ret;
- struct ac_dpages_arg *arg = _arg;
-
- ret = D_WALK_CONTINUE;
- if (dentry->d_sb == arg->sb
- && !IS_ROOT(dentry)
- && au_dcount(dentry) > 0
- && au_di(dentry)
- && (!arg->test || arg->test(dentry, arg->arg))) {
- arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC);
- if (unlikely(arg->err))
- ret = D_WALK_QUIT;
- }
-
- return ret;
-}
-
-int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
- au_dpages_test test, void *arg)
-{
- struct ac_dpages_arg args = {
- .err = 0,
- .dpages = dpages,
- .sb = root->d_sb,
- .test = test,
- .arg = arg
- };
-
- d_walk(root, &args, au_call_dpages_append, NULL);
-
- return args.err;
-}
-
-int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
- int do_include, au_dpages_test test, void *arg)
-{
- int err;
-
- err = 0;
- write_seqlock(&rename_lock);
- spin_lock(&dentry->d_lock);
- if (do_include
- && au_dcount(dentry) > 0
- && (!test || test(dentry, arg)))
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- spin_unlock(&dentry->d_lock);
- if (unlikely(err))
- goto out;
-
- /*
- * RCU for vfsmount is unnecessary since this is a traverse in a single
- * mount
- */
- while (!IS_ROOT(dentry)) {
- dentry = dentry->d_parent; /* rename_lock is locked */
- spin_lock(&dentry->d_lock);
- if (au_dcount(dentry) > 0
- && (!test || test(dentry, arg)))
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- spin_unlock(&dentry->d_lock);
- if (unlikely(err))
- break;
- }
-
-out:
- write_sequnlock(&rename_lock);
- return err;
-}
-
-static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg)
-{
- return au_di(dentry) && dentry->d_sb == arg;
-}
-
-int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
- struct dentry *dentry, int do_include)
-{
- return au_dcsub_pages_rev(dpages, dentry, do_include,
- au_dcsub_dpages_aufs, dentry->d_sb);
-}
-
-int au_test_subdir(struct dentry *d1, struct dentry *d2)
-{
- struct path path[2] = {
- {
- .dentry = d1
- },
- {
- .dentry = d2
- }
- };
-
- return path_is_under(path + 0, path + 1);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for dentry cache
- */
-
-#ifndef __AUFS_DCSUB_H__
-#define __AUFS_DCSUB_H__
-
-#ifdef __KERNEL__
-
-#include <linux/dcache.h>
-#include <linux/fs.h>
-
-struct au_dpage {
- int ndentry;
- struct dentry **dentries;
-};
-
-struct au_dcsub_pages {
- int ndpage;
- struct au_dpage *dpages;
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* dcsub.c */
-int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
-void au_dpages_free(struct au_dcsub_pages *dpages);
-typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
-int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
- au_dpages_test test, void *arg);
-int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
- int do_include, au_dpages_test test, void *arg);
-int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
- struct dentry *dentry, int do_include);
-int au_test_subdir(struct dentry *d1, struct dentry *d2);
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * todo: in linux-3.13, several similar (but faster) helpers are added to
- * include/linux/dcache.h. Try them (in the future).
- */
-
-static inline int au_d_hashed_positive(struct dentry *d)
-{
- int err;
- struct inode *inode = d_inode(d);
-
- err = 0;
- if (unlikely(d_unhashed(d)
- || d_is_negative(d)
- || !inode->i_nlink))
- err = -ENOENT;
- return err;
-}
-
-static inline int au_d_linkable(struct dentry *d)
-{
- int err;
- struct inode *inode = d_inode(d);
-
- err = au_d_hashed_positive(d);
- if (err
- && d_is_positive(d)
- && (inode->i_state & I_LINKABLE))
- err = 0;
- return err;
-}
-
-static inline int au_d_alive(struct dentry *d)
-{
- int err;
- struct inode *inode;
-
- err = 0;
- if (!IS_ROOT(d))
- err = au_d_hashed_positive(d);
- else {
- inode = d_inode(d);
- if (unlikely(d_unlinked(d)
- || d_is_negative(d)
- || !inode->i_nlink))
- err = -ENOENT;
- }
- return err;
-}
-
-static inline int au_alive_dir(struct dentry *d)
-{
- int err;
-
- err = au_d_alive(d);
- if (unlikely(err || IS_DEADDIR(d_inode(d))))
- err = -ENOENT;
- return err;
-}
-
-static inline int au_qstreq(struct qstr *a, struct qstr *b)
-{
- return a->len == b->len
- && !memcmp(a->name, b->name, a->len);
-}
-
-/*
- * by the commit
- * 360f547 2015-01-25 dcache: let the dentry count go down to zero without
- * taking d_lock
- * the type of d_lockref.count became int, but the inlined function d_count()
- * still returns unsigned int.
- * I don't know why. Maybe it is for every d_count() users?
- * Anyway au_dcount() lives on.
- */
-static inline int au_dcount(struct dentry *d)
-{
- return (int)d_count(d);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DCSUB_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * debug print functions
- */
-
-#include "aufs.h"
-
-/* Returns 0, or -errno. arg is in kp->arg. */
-static int param_atomic_t_set(const char *val, const struct kernel_param *kp)
-{
- int err, n;
-
- err = kstrtoint(val, 0, &n);
- if (!err) {
- if (n > 0)
- au_debug_on();
- else
- au_debug_off();
- }
- return err;
-}
-
-/* Returns length written or -errno. Buffer is 4k (ie. be short!) */
-static int param_atomic_t_get(char *buffer, const struct kernel_param *kp)
-{
- atomic_t *a;
-
- a = kp->arg;
- return sprintf(buffer, "%d", atomic_read(a));
-}
-
-static struct kernel_param_ops param_ops_atomic_t = {
- .set = param_atomic_t_set,
- .get = param_atomic_t_get
- /* void (*free)(void *arg) */
-};
-
-atomic_t aufs_debug = ATOMIC_INIT(0);
-MODULE_PARM_DESC(debug, "debug print");
-module_param_named(debug, aufs_debug, atomic_t, S_IRUGO | S_IWUSR | S_IWGRP);
-
-DEFINE_MUTEX(au_dbg_mtx); /* just to serialize the dbg msgs */
-char *au_plevel = KERN_DEBUG;
-#define dpri(fmt, ...) do { \
- if ((au_plevel \
- && strcmp(au_plevel, KERN_DEBUG)) \
- || au_debug_test()) \
- printk("%s" fmt, au_plevel, ##__VA_ARGS__); \
-} while (0)
-
-/* ---------------------------------------------------------------------- */
-
-void au_dpri_whlist(struct au_nhash *whlist)
-{
- unsigned long ul, n;
- struct hlist_head *head;
- struct au_vdir_wh *pos;
-
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (ul = 0; ul < n; ul++) {
- hlist_for_each_entry(pos, head, wh_hash)
- dpri("b%d, %.*s, %d\n",
- pos->wh_bindex,
- pos->wh_str.len, pos->wh_str.name,
- pos->wh_str.len);
- head++;
- }
-}
-
-void au_dpri_vdir(struct au_vdir *vdir)
-{
- unsigned long ul;
- union au_vdir_deblk_p p;
- unsigned char *o;
-
- if (!vdir || IS_ERR(vdir)) {
- dpri("err %ld\n", PTR_ERR(vdir));
- return;
- }
-
- dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n",
- vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk,
- vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version);
- for (ul = 0; ul < vdir->vd_nblk; ul++) {
- p.deblk = vdir->vd_deblk[ul];
- o = p.deblk;
- dpri("[%lu]: %p\n", ul, o);
- }
-}
-
-static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn,
- struct dentry *wh)
-{
- char *n = NULL;
- int l = 0;
-
- if (!inode || IS_ERR(inode)) {
- dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
- return -1;
- }
-
- /* the type of i_blocks depends upon CONFIG_LBDAF */
- BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
- && sizeof(inode->i_blocks) != sizeof(u64));
- if (wh) {
- n = (void *)wh->d_name.name;
- l = wh->d_name.len;
- }
-
- dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
- " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n",
- bindex, inode,
- inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
- atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
- i_size_read(inode), (unsigned long long)inode->i_blocks,
- hn, (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
- inode->i_mapping ? inode->i_mapping->nrpages : 0,
- inode->i_state, inode->i_flags, inode->i_version,
- inode->i_generation,
- l ? ", wh " : "", l, n);
- return 0;
-}
-
-void au_dpri_inode(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- struct au_hinode *hi;
- aufs_bindex_t bindex;
- int err, hn;
-
- err = do_pri_inode(-1, inode, -1, NULL);
- if (err || !au_test_aufs(inode->i_sb) || au_is_bad_inode(inode))
- return;
-
- iinfo = au_ii(inode);
- dpri("i-1: btop %d, bbot %d, gen %d\n",
- iinfo->ii_btop, iinfo->ii_bbot, au_iigen(inode, NULL));
- if (iinfo->ii_btop < 0)
- return;
- hn = 0;
- for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; bindex++) {
- hi = au_hinode(iinfo, bindex);
- hn = !!au_hn(hi);
- do_pri_inode(bindex, hi->hi_inode, hn, hi->hi_whdentry);
- }
-}
-
-void au_dpri_dalias(struct inode *inode)
-{
- struct dentry *d;
-
- spin_lock(&inode->i_lock);
- hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias)
- au_dpri_dentry(d);
- spin_unlock(&inode->i_lock);
-}
-
-static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
-{
- struct dentry *wh = NULL;
- int hn;
- struct inode *inode;
- struct au_iinfo *iinfo;
- struct au_hinode *hi;
-
- if (!dentry || IS_ERR(dentry)) {
- dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
- return -1;
- }
- /* do not call dget_parent() here */
- /* note: access d_xxx without d_lock */
- dpri("d%d: %p, %pd2?, %s, cnt %d, flags 0x%x, %shashed\n",
- bindex, dentry, dentry,
- dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
- au_dcount(dentry), dentry->d_flags,
- d_unhashed(dentry) ? "un" : "");
- hn = -1;
- inode = NULL;
- if (d_is_positive(dentry))
- inode = d_inode(dentry);
- if (inode
- && au_test_aufs(dentry->d_sb)
- && bindex >= 0
- && !au_is_bad_inode(inode)) {
- iinfo = au_ii(inode);
- hi = au_hinode(iinfo, bindex);
- hn = !!au_hn(hi);
- wh = hi->hi_whdentry;
- }
- do_pri_inode(bindex, inode, hn, wh);
- return 0;
-}
-
-void au_dpri_dentry(struct dentry *dentry)
-{
- struct au_dinfo *dinfo;
- aufs_bindex_t bindex;
- int err;
-
- err = do_pri_dentry(-1, dentry);
- if (err || !au_test_aufs(dentry->d_sb))
- return;
-
- dinfo = au_di(dentry);
- if (!dinfo)
- return;
- dpri("d-1: btop %d, bbot %d, bwh %d, bdiropq %d, gen %d, tmp %d\n",
- dinfo->di_btop, dinfo->di_bbot,
- dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry),
- dinfo->di_tmpfile);
- if (dinfo->di_btop < 0)
- return;
- for (bindex = dinfo->di_btop; bindex <= dinfo->di_bbot; bindex++)
- do_pri_dentry(bindex, au_hdentry(dinfo, bindex)->hd_dentry);
-}
-
-static int do_pri_file(aufs_bindex_t bindex, struct file *file)
-{
- char a[32];
-
- if (!file || IS_ERR(file)) {
- dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
- return -1;
- }
- a[0] = 0;
- if (bindex < 0
- && !IS_ERR_OR_NULL(file->f_path.dentry)
- && au_test_aufs(file->f_path.dentry->d_sb)
- && au_fi(file))
- snprintf(a, sizeof(a), ", gen %d, mmapped %d",
- au_figen(file), atomic_read(&au_fi(file)->fi_mmapped));
- dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n",
- bindex, file->f_mode, file->f_flags, (long)file_count(file),
- file->f_version, file->f_pos, a);
- if (!IS_ERR_OR_NULL(file->f_path.dentry))
- do_pri_dentry(bindex, file->f_path.dentry);
- return 0;
-}
-
-void au_dpri_file(struct file *file)
-{
- struct au_finfo *finfo;
- struct au_fidir *fidir;
- struct au_hfile *hfile;
- aufs_bindex_t bindex;
- int err;
-
- err = do_pri_file(-1, file);
- if (err
- || IS_ERR_OR_NULL(file->f_path.dentry)
- || !au_test_aufs(file->f_path.dentry->d_sb))
- return;
-
- finfo = au_fi(file);
- if (!finfo)
- return;
- if (finfo->fi_btop < 0)
- return;
- fidir = finfo->fi_hdir;
- if (!fidir)
- do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file);
- else
- for (bindex = finfo->fi_btop;
- bindex >= 0 && bindex <= fidir->fd_bbot;
- bindex++) {
- hfile = fidir->fd_hfile + bindex;
- do_pri_file(bindex, hfile ? hfile->hf_file : NULL);
- }
-}
-
-static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
-{
- struct vfsmount *mnt;
- struct super_block *sb;
-
- if (!br || IS_ERR(br))
- goto out;
- mnt = au_br_mnt(br);
- if (!mnt || IS_ERR(mnt))
- goto out;
- sb = mnt->mnt_sb;
- if (!sb || IS_ERR(sb))
- goto out;
-
- dpri("s%d: {perm 0x%x, id %d, cnt %lld, wbr %p}, "
- "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, "
- "xino %d\n",
- bindex, br->br_perm, br->br_id, au_br_count(br),
- br->br_wbr, au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
- sb->s_flags, sb->s_count,
- atomic_read(&sb->s_active), !!br->br_xino.xi_file);
- return 0;
-
-out:
- dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
- return -1;
-}
-
-void au_dpri_sb(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- aufs_bindex_t bindex;
- int err;
- /* to reuduce stack size */
- struct {
- struct vfsmount mnt;
- struct au_branch fake;
- } *a;
-
- /* this function can be called from magic sysrq */
- a = kzalloc(sizeof(*a), GFP_ATOMIC);
- if (unlikely(!a)) {
- dpri("no memory\n");
- return;
- }
-
- a->mnt.mnt_sb = sb;
- a->fake.br_path.mnt = &a->mnt;
- au_br_count_init(&a->fake);
- err = do_pri_br(-1, &a->fake);
- au_br_count_fin(&a->fake);
- au_delayed_kfree(a);
- dpri("dev 0x%x\n", sb->s_dev);
- if (err || !au_test_aufs(sb))
- return;
-
- sbinfo = au_sbi(sb);
- if (!sbinfo)
- return;
- dpri("nw %d, gen %u, kobj %d\n",
- atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
- atomic_read(&sbinfo->si_kobj.kref.refcount));
- for (bindex = 0; bindex <= sbinfo->si_bbot; bindex++)
- do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line)
-{
- struct inode *h_inode, *inode = d_inode(dentry);
- struct dentry *h_dentry;
- aufs_bindex_t bindex, bbot, bi;
-
- if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */)
- return;
-
- bbot = au_dbbot(dentry);
- bi = au_ibbot(inode);
- if (bi < bbot)
- bbot = bi;
- bindex = au_dbtop(dentry);
- bi = au_ibtop(inode);
- if (bi > bindex)
- bindex = bi;
-
- for (; bindex <= bbot; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- h_inode = au_h_iptr(inode, bindex);
- if (unlikely(h_inode != d_inode(h_dentry))) {
- au_debug_on();
- AuDbg("b%d, %s:%d\n", bindex, func, line);
- AuDbgDentry(dentry);
- AuDbgInode(inode);
- au_debug_off();
- BUG();
- }
- }
-}
-
-void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
-{
- int err, i, j;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- AuDebugOn(err);
- err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1);
- AuDebugOn(err);
- for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- for (j = dpage->ndentry - 1; !err && j >= 0; j--)
- AuDebugOn(au_digen_test(dentries[j], sigen));
- }
- au_dpages_free(&dpages);
-}
-
-void au_dbg_verify_kthread(void)
-{
- if (au_wkq_test()) {
- au_dbg_blocked();
- /*
- * It may be recursive, but udba=notify between two aufs mounts,
- * where a single ro branch is shared, is not a problem.
- */
- /* WARN_ON(1); */
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-int __init au_debug_init(void)
-{
- aufs_bindex_t bindex;
- struct au_vdir_destr destr;
-
- bindex = -1;
- AuDebugOn(bindex >= 0);
-
- destr.len = -1;
- AuDebugOn(destr.len < NAME_MAX);
-
-#ifdef CONFIG_4KSTACKS
- pr_warn("CONFIG_4KSTACKS is defined.\n");
-#endif
-
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * debug print functions
- */
-
-#ifndef __AUFS_DEBUG_H__
-#define __AUFS_DEBUG_H__
-
-#ifdef __KERNEL__
-
-#include <linux/atomic.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/sysrq.h>
-
-#ifdef CONFIG_AUFS_DEBUG
-#define AuDebugOn(a) BUG_ON(a)
-
-/* module parameter */
-extern atomic_t aufs_debug;
-static inline void au_debug_on(void)
-{
- atomic_inc(&aufs_debug);
-}
-static inline void au_debug_off(void)
-{
- atomic_dec_if_positive(&aufs_debug);
-}
-
-static inline int au_debug_test(void)
-{
- return atomic_read(&aufs_debug) > 0;
-}
-#else
-#define AuDebugOn(a) do {} while (0)
-AuStubVoid(au_debug_on, void)
-AuStubVoid(au_debug_off, void)
-AuStubInt0(au_debug_test, void)
-#endif /* CONFIG_AUFS_DEBUG */
-
-#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t)
-
-/* ---------------------------------------------------------------------- */
-
-/* debug print */
-
-#define AuDbg(fmt, ...) do { \
- if (au_debug_test()) \
- pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
-} while (0)
-#define AuLabel(l) AuDbg(#l "\n")
-#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__)
-#define AuWarn1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- pr_warn(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuErr1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- pr_err(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuIOErr1(fmt, ...) do { \
- static unsigned char _c; \
- if (!_c++) \
- AuIOErr(fmt, ##__VA_ARGS__); \
-} while (0)
-
-#define AuUnsupportMsg "This operation is not supported." \
- " Please report this application to aufs-users ML."
-#define AuUnsupport(fmt, ...) do { \
- pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
- dump_stack(); \
-} while (0)
-
-#define AuTraceErr(e) do { \
- if (unlikely((e) < 0)) \
- AuDbg("err %d\n", (int)(e)); \
-} while (0)
-
-#define AuTraceErrPtr(p) do { \
- if (IS_ERR(p)) \
- AuDbg("err %ld\n", PTR_ERR(p)); \
-} while (0)
-
-/* dirty macros for debug print, use with "%.*s" and caution */
-#define AuLNPair(qstr) (qstr)->len, (qstr)->name
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry;
-#ifdef CONFIG_AUFS_DEBUG
-extern struct mutex au_dbg_mtx;
-extern char *au_plevel;
-struct au_nhash;
-void au_dpri_whlist(struct au_nhash *whlist);
-struct au_vdir;
-void au_dpri_vdir(struct au_vdir *vdir);
-struct inode;
-void au_dpri_inode(struct inode *inode);
-void au_dpri_dalias(struct inode *inode);
-void au_dpri_dentry(struct dentry *dentry);
-struct file;
-void au_dpri_file(struct file *filp);
-struct super_block;
-void au_dpri_sb(struct super_block *sb);
-
-#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__)
-void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line);
-void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
-void au_dbg_verify_kthread(void);
-
-int __init au_debug_init(void);
-
-#define AuDbgWhlist(w) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#w "\n"); \
- au_dpri_whlist(w); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgVdir(v) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#v "\n"); \
- au_dpri_vdir(v); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgInode(i) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#i "\n"); \
- au_dpri_inode(i); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgDAlias(i) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#i "\n"); \
- au_dpri_dalias(i); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgDentry(d) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#d "\n"); \
- au_dpri_dentry(d); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgFile(f) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#f "\n"); \
- au_dpri_file(f); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgSb(sb) do { \
- mutex_lock(&au_dbg_mtx); \
- AuDbg(#sb "\n"); \
- au_dpri_sb(sb); \
- mutex_unlock(&au_dbg_mtx); \
-} while (0)
-
-#define AuDbgSym(addr) do { \
- char sym[KSYM_SYMBOL_LEN]; \
- sprint_symbol(sym, (unsigned long)addr); \
- AuDbg("%s\n", sym); \
-} while (0)
-#else
-AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry)
-AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
-AuStubVoid(au_dbg_verify_kthread, void)
-AuStubInt0(__init au_debug_init, void)
-
-#define AuDbgWhlist(w) do {} while (0)
-#define AuDbgVdir(v) do {} while (0)
-#define AuDbgInode(i) do {} while (0)
-#define AuDbgDAlias(i) do {} while (0)
-#define AuDbgDentry(d) do {} while (0)
-#define AuDbgFile(f) do {} while (0)
-#define AuDbgSb(sb) do {} while (0)
-#define AuDbgSym(addr) do {} while (0)
-#endif /* CONFIG_AUFS_DEBUG */
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-int __init au_sysrq_init(void);
-void au_sysrq_fin(void);
-
-#ifdef CONFIG_HW_CONSOLE
-#define au_dbg_blocked() do { \
- WARN_ON(1); \
- handle_sysrq('w'); \
-} while (0)
-#else
-AuStubVoid(au_dbg_blocked, void)
-#endif
-
-#else
-AuStubInt0(__init au_sysrq_init, void)
-AuStubVoid(au_sysrq_fin, void)
-AuStubVoid(au_dbg_blocked, void)
-#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DEBUG_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * lookup and dentry operations
- */
-
-#include <linux/namei.h>
-#include "aufs.h"
-
-struct au_do_lookup_args {
- unsigned int flags;
- mode_t type;
-};
-
-/*
- * returns positive/negative dentry, NULL or an error.
- * NULL means whiteout-ed or not-found.
- */
-static struct dentry*
-au_do_lookup(struct dentry *h_parent, struct dentry *dentry,
- aufs_bindex_t bindex, struct qstr *wh_name,
- struct au_do_lookup_args *args)
-{
- struct dentry *h_dentry;
- struct inode *h_inode;
- struct au_branch *br;
- int wh_found, opq;
- unsigned char wh_able;
- const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG);
- const unsigned char ignore_perm = !!au_ftest_lkup(args->flags,
- IGNORE_PERM);
-
- wh_found = 0;
- br = au_sbr(dentry->d_sb, bindex);
- wh_able = !!au_br_whable(br->br_perm);
- if (wh_able)
- wh_found = au_wh_test(h_parent, wh_name, ignore_perm);
- h_dentry = ERR_PTR(wh_found);
- if (!wh_found)
- goto real_lookup;
- if (unlikely(wh_found < 0))
- goto out;
-
- /* We found a whiteout */
- /* au_set_dbbot(dentry, bindex); */
- au_set_dbwh(dentry, bindex);
- if (!allow_neg)
- return NULL; /* success */
-
-real_lookup:
- if (!ignore_perm)
- h_dentry = vfsub_lkup_one(&dentry->d_name, h_parent);
- else
- h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent);
- if (IS_ERR(h_dentry)) {
- if (PTR_ERR(h_dentry) == -ENAMETOOLONG
- && !allow_neg)
- h_dentry = NULL;
- goto out;
- }
-
- h_inode = d_inode(h_dentry);
- if (d_is_negative(h_dentry)) {
- if (!allow_neg)
- goto out_neg;
- } else if (wh_found
- || (args->type && args->type != (h_inode->i_mode & S_IFMT)))
- goto out_neg;
-
- if (au_dbbot(dentry) <= bindex)
- au_set_dbbot(dentry, bindex);
- if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry))
- au_set_dbtop(dentry, bindex);
- au_set_h_dptr(dentry, bindex, h_dentry);
-
- if (!d_is_dir(h_dentry)
- || !wh_able
- || (d_really_is_positive(dentry) && !d_is_dir(dentry)))
- goto out; /* success */
-
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- opq = au_diropq_test(h_dentry);
- inode_unlock(h_inode);
- if (opq > 0)
- au_set_dbdiropq(dentry, bindex);
- else if (unlikely(opq < 0)) {
- au_set_h_dptr(dentry, bindex, NULL);
- h_dentry = ERR_PTR(opq);
- }
- goto out;
-
-out_neg:
- dput(h_dentry);
- h_dentry = NULL;
-out:
- return h_dentry;
-}
-
-static int au_test_shwh(struct super_block *sb, const struct qstr *name)
-{
- if (unlikely(!au_opt_test(au_mntflags(sb), SHWH)
- && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
- return -EPERM;
- return 0;
-}
-
-/*
- * returns the number of lower positive dentries,
- * otherwise an error.
- * can be called at unlinking with @type is zero.
- */
-int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop,
- unsigned int flags)
-{
- int npositive, err;
- aufs_bindex_t bindex, btail, bdiropq;
- unsigned char isdir, dirperm1;
- struct qstr whname;
- struct au_do_lookup_args args = {
- .flags = flags
- };
- const struct qstr *name = &dentry->d_name;
- struct dentry *parent;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- err = au_test_shwh(sb, name);
- if (unlikely(err))
- goto out;
-
- err = au_wh_name_alloc(&whname, name);
- if (unlikely(err))
- goto out;
-
- isdir = !!d_is_dir(dentry);
- dirperm1 = !!au_opt_test(au_mntflags(sb), DIRPERM1);
-
- npositive = 0;
- parent = dget_parent(dentry);
- btail = au_dbtaildir(parent);
- for (bindex = btop; bindex <= btail; bindex++) {
- struct dentry *h_parent, *h_dentry;
- struct inode *h_inode, *h_dir;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry) {
- if (d_is_positive(h_dentry))
- npositive++;
- break;
- }
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || !d_is_dir(h_parent))
- continue;
-
- h_dir = d_inode(h_parent);
- inode_lock_nested(h_dir, AuLsc_I_PARENT);
- h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname,
- &args);
- inode_unlock(h_dir);
- err = PTR_ERR(h_dentry);
- if (IS_ERR(h_dentry))
- goto out_parent;
- if (h_dentry)
- au_fclr_lkup(args.flags, ALLOW_NEG);
- if (dirperm1)
- au_fset_lkup(args.flags, IGNORE_PERM);
-
- if (au_dbwh(dentry) == bindex)
- break;
- if (!h_dentry)
- continue;
- if (d_is_negative(h_dentry))
- continue;
- h_inode = d_inode(h_dentry);
- npositive++;
- if (!args.type)
- args.type = h_inode->i_mode & S_IFMT;
- if (args.type != S_IFDIR)
- break;
- else if (isdir) {
- /* the type of lower may be different */
- bdiropq = au_dbdiropq(dentry);
- if (bdiropq >= 0 && bdiropq <= bindex)
- break;
- }
- }
-
- if (npositive) {
- AuLabel(positive);
- au_update_dbtop(dentry);
- }
- err = npositive;
- if (unlikely(!au_opt_test(au_mntflags(sb), UDBA_NONE)
- && au_dbtop(dentry) < 0)) {
- err = -EIO;
- AuIOErr("both of real entry and whiteout found, %pd, err %d\n",
- dentry, err);
- }
-
-out_parent:
- dput(parent);
- au_delayed_kfree(whname.name);
-out:
- return err;
-}
-
-struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent)
-{
- struct dentry *dentry;
- int wkq_err;
-
- if (!au_test_h_perm_sio(d_inode(parent), MAY_EXEC))
- dentry = vfsub_lkup_one(name, parent);
- else {
- struct vfsub_lkup_one_args args = {
- .errp = &dentry,
- .name = name,
- .parent = parent
- };
-
- wkq_err = au_wkq_wait(vfsub_call_lkup_one, &args);
- if (unlikely(wkq_err))
- dentry = ERR_PTR(wkq_err);
- }
-
- return dentry;
-}
-
-/*
- * lookup @dentry on @bindex which should be negative.
- */
-int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh)
-{
- int err;
- struct dentry *parent, *h_parent, *h_dentry;
- struct au_branch *br;
-
- parent = dget_parent(dentry);
- h_parent = au_h_dptr(parent, bindex);
- br = au_sbr(dentry->d_sb, bindex);
- if (wh)
- h_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
- else
- h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent);
- err = PTR_ERR(h_dentry);
- if (IS_ERR(h_dentry))
- goto out;
- if (unlikely(d_is_positive(h_dentry))) {
- err = -EIO;
- AuIOErr("%pd should be negative on b%d.\n", h_dentry, bindex);
- dput(h_dentry);
- goto out;
- }
-
- err = 0;
- if (bindex < au_dbtop(dentry))
- au_set_dbtop(dentry, bindex);
- if (au_dbbot(dentry) < bindex)
- au_set_dbbot(dentry, bindex);
- au_set_h_dptr(dentry, bindex, h_dentry);
-
-out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* subset of struct inode */
-struct au_iattr {
- unsigned long i_ino;
- /* unsigned int i_nlink; */
- kuid_t i_uid;
- kgid_t i_gid;
- u64 i_version;
-/*
- loff_t i_size;
- blkcnt_t i_blocks;
-*/
- umode_t i_mode;
-};
-
-static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode)
-{
- ia->i_ino = h_inode->i_ino;
- /* ia->i_nlink = h_inode->i_nlink; */
- ia->i_uid = h_inode->i_uid;
- ia->i_gid = h_inode->i_gid;
- ia->i_version = h_inode->i_version;
-/*
- ia->i_size = h_inode->i_size;
- ia->i_blocks = h_inode->i_blocks;
-*/
- ia->i_mode = (h_inode->i_mode & S_IFMT);
-}
-
-static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode)
-{
- return ia->i_ino != h_inode->i_ino
- /* || ia->i_nlink != h_inode->i_nlink */
- || !uid_eq(ia->i_uid, h_inode->i_uid)
- || !gid_eq(ia->i_gid, h_inode->i_gid)
- || ia->i_version != h_inode->i_version
-/*
- || ia->i_size != h_inode->i_size
- || ia->i_blocks != h_inode->i_blocks
-*/
- || ia->i_mode != (h_inode->i_mode & S_IFMT);
-}
-
-static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent,
- struct au_branch *br)
-{
- int err;
- struct au_iattr ia;
- struct inode *h_inode;
- struct dentry *h_d;
- struct super_block *h_sb;
-
- err = 0;
- memset(&ia, -1, sizeof(ia));
- h_sb = h_dentry->d_sb;
- h_inode = NULL;
- if (d_is_positive(h_dentry)) {
- h_inode = d_inode(h_dentry);
- au_iattr_save(&ia, h_inode);
- } else if (au_test_nfs(h_sb) || au_test_fuse(h_sb))
- /* nfs d_revalidate may return 0 for negative dentry */
- /* fuse d_revalidate always return 0 for negative dentry */
- goto out;
-
- /* main purpose is namei.c:cached_lookup() and d_revalidate */
- h_d = vfsub_lkup_one(&h_dentry->d_name, h_parent);
- err = PTR_ERR(h_d);
- if (IS_ERR(h_d))
- goto out;
-
- err = 0;
- if (unlikely(h_d != h_dentry
- || d_inode(h_d) != h_inode
- || (h_inode && au_iattr_test(&ia, h_inode))))
- err = au_busy_or_stale();
- dput(h_d);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
- struct dentry *h_parent, struct au_branch *br)
-{
- int err;
-
- err = 0;
- if (udba == AuOpt_UDBA_REVAL
- && !au_test_fs_remote(h_dentry->d_sb)) {
- IMustLock(h_dir);
- err = (d_inode(h_dentry->d_parent) != h_dir);
- } else if (udba != AuOpt_UDBA_NONE)
- err = au_h_verify_dentry(h_dentry, h_parent, br);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent)
-{
- int err;
- aufs_bindex_t new_bindex, bindex, bbot, bwh, bdiropq;
- struct au_hdentry tmp, *p, *q;
- struct au_dinfo *dinfo;
- struct super_block *sb;
-
- DiMustWriteLock(dentry);
-
- sb = dentry->d_sb;
- dinfo = au_di(dentry);
- bbot = dinfo->di_bbot;
- bwh = dinfo->di_bwh;
- bdiropq = dinfo->di_bdiropq;
- bindex = dinfo->di_btop;
- p = au_hdentry(dinfo, bindex);
- for (; bindex <= bbot; bindex++, p++) {
- if (!p->hd_dentry)
- continue;
-
- new_bindex = au_br_index(sb, p->hd_id);
- if (new_bindex == bindex)
- continue;
-
- if (dinfo->di_bwh == bindex)
- bwh = new_bindex;
- if (dinfo->di_bdiropq == bindex)
- bdiropq = new_bindex;
- if (new_bindex < 0) {
- au_hdput(p);
- p->hd_dentry = NULL;
- continue;
- }
-
- /* swap two lower dentries, and loop again */
- q = au_hdentry(dinfo, new_bindex);
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hd_dentry) {
- bindex--;
- p--;
- }
- }
-
- dinfo->di_bwh = -1;
- if (bwh >= 0 && bwh <= au_sbbot(sb) && au_sbr_whable(sb, bwh))
- dinfo->di_bwh = bwh;
-
- dinfo->di_bdiropq = -1;
- if (bdiropq >= 0
- && bdiropq <= au_sbbot(sb)
- && au_sbr_whable(sb, bdiropq))
- dinfo->di_bdiropq = bdiropq;
-
- err = -EIO;
- dinfo->di_btop = -1;
- dinfo->di_bbot = -1;
- bbot = au_dbbot(parent);
- bindex = 0;
- p = au_hdentry(dinfo, bindex);
- for (; bindex <= bbot; bindex++, p++)
- if (p->hd_dentry) {
- dinfo->di_btop = bindex;
- break;
- }
-
- if (dinfo->di_btop >= 0) {
- bindex = bbot;
- p = au_hdentry(dinfo, bindex);
- for (; bindex >= 0; bindex--, p--)
- if (p->hd_dentry) {
- dinfo->di_bbot = bindex;
- err = 0;
- break;
- }
- }
-
- return err;
-}
-
-static void au_do_hide(struct dentry *dentry)
-{
- struct inode *inode;
-
- if (d_really_is_positive(dentry)) {
- inode = d_inode(dentry);
- if (!d_is_dir(dentry)) {
- if (inode->i_nlink && !d_unhashed(dentry))
- drop_nlink(inode);
- } else {
- clear_nlink(inode);
- /* stop next lookup */
- inode->i_flags |= S_DEAD;
- }
- smp_mb(); /* necessary? */
- }
- d_drop(dentry);
-}
-
-static int au_hide_children(struct dentry *parent)
-{
- int err, i, j, ndentry;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry *dentry;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, parent, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- /* in reverse order */
- for (i = dpages.ndpage - 1; i >= 0; i--) {
- dpage = dpages.dpages + i;
- ndentry = dpage->ndentry;
- for (j = ndentry - 1; j >= 0; j--) {
- dentry = dpage->dentries[j];
- if (dentry != parent)
- au_do_hide(dentry);
- }
- }
-
-out_dpages:
- au_dpages_free(&dpages);
-out:
- return err;
-}
-
-static void au_hide(struct dentry *dentry)
-{
- int err;
-
- AuDbgDentry(dentry);
- if (d_is_dir(dentry)) {
- /* shrink_dcache_parent(dentry); */
- err = au_hide_children(dentry);
- if (unlikely(err))
- AuIOErr("%pd, failed hiding children, ignored %d\n",
- dentry, err);
- }
- au_do_hide(dentry);
-}
-
-/*
- * By adding a dirty branch, a cached dentry may be affected in various ways.
- *
- * a dirty branch is added
- * - on the top of layers
- * - in the middle of layers
- * - to the bottom of layers
- *
- * on the added branch there exists
- * - a whiteout
- * - a diropq
- * - a same named entry
- * + exist
- * * negative --> positive
- * * positive --> positive
- * - type is unchanged
- * - type is changed
- * + doesn't exist
- * * negative --> negative
- * * positive --> negative (rejected by au_br_del() for non-dir case)
- * - none
- */
-static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo,
- struct au_dinfo *tmp)
-{
- int err;
- aufs_bindex_t bindex, bbot;
- struct {
- struct dentry *dentry;
- struct inode *inode;
- mode_t mode;
- } orig_h, tmp_h = {
- .dentry = NULL
- };
- struct au_hdentry *hd;
- struct inode *inode, *h_inode;
- struct dentry *h_dentry;
-
- err = 0;
- AuDebugOn(dinfo->di_btop < 0);
- orig_h.mode = 0;
- orig_h.dentry = au_hdentry(dinfo, dinfo->di_btop)->hd_dentry;
- orig_h.inode = NULL;
- if (d_is_positive(orig_h.dentry)) {
- orig_h.inode = d_inode(orig_h.dentry);
- orig_h.mode = orig_h.inode->i_mode & S_IFMT;
- }
- if (tmp->di_btop >= 0) {
- tmp_h.dentry = au_hdentry(tmp, tmp->di_btop)->hd_dentry;
- if (d_is_positive(tmp_h.dentry)) {
- tmp_h.inode = d_inode(tmp_h.dentry);
- tmp_h.mode = tmp_h.inode->i_mode & S_IFMT;
- }
- }
-
- inode = NULL;
- if (d_really_is_positive(dentry))
- inode = d_inode(dentry);
- if (!orig_h.inode) {
- AuDbg("nagative originally\n");
- if (inode) {
- au_hide(dentry);
- goto out;
- }
- AuDebugOn(inode);
- AuDebugOn(dinfo->di_btop != dinfo->di_bbot);
- AuDebugOn(dinfo->di_bdiropq != -1);
-
- if (!tmp_h.inode) {
- AuDbg("negative --> negative\n");
- /* should have only one negative lower */
- if (tmp->di_btop >= 0
- && tmp->di_btop < dinfo->di_btop) {
- AuDebugOn(tmp->di_btop != tmp->di_bbot);
- AuDebugOn(dinfo->di_btop != dinfo->di_bbot);
- au_set_h_dptr(dentry, dinfo->di_btop, NULL);
- au_di_cp(dinfo, tmp);
- hd = au_hdentry(tmp, tmp->di_btop);
- au_set_h_dptr(dentry, tmp->di_btop,
- dget(hd->hd_dentry));
- }
- au_dbg_verify_dinode(dentry);
- } else {
- AuDbg("negative --> positive\n");
- /*
- * similar to the behaviour of creating with bypassing
- * aufs.
- * unhash it in order to force an error in the
- * succeeding create operation.
- * we should not set S_DEAD here.
- */
- d_drop(dentry);
- /* au_di_swap(tmp, dinfo); */
- au_dbg_verify_dinode(dentry);
- }
- } else {
- AuDbg("positive originally\n");
- /* inode may be NULL */
- AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode);
- if (!tmp_h.inode) {
- AuDbg("positive --> negative\n");
- /* or bypassing aufs */
- au_hide(dentry);
- if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_btop)
- dinfo->di_bwh = tmp->di_bwh;
- if (inode)
- err = au_refresh_hinode_self(inode);
- au_dbg_verify_dinode(dentry);
- } else if (orig_h.mode == tmp_h.mode) {
- AuDbg("positive --> positive, same type\n");
- if (!S_ISDIR(orig_h.mode)
- && dinfo->di_btop > tmp->di_btop) {
- /*
- * similar to the behaviour of removing and
- * creating.
- */
- au_hide(dentry);
- if (inode)
- err = au_refresh_hinode_self(inode);
- au_dbg_verify_dinode(dentry);
- } else {
- /* fill empty slots */
- if (dinfo->di_btop > tmp->di_btop)
- dinfo->di_btop = tmp->di_btop;
- if (dinfo->di_bbot < tmp->di_bbot)
- dinfo->di_bbot = tmp->di_bbot;
- dinfo->di_bwh = tmp->di_bwh;
- dinfo->di_bdiropq = tmp->di_bdiropq;
- bbot = dinfo->di_bbot;
- bindex = tmp->di_btop;
- hd = au_hdentry(tmp, bindex);
- for (; bindex <= bbot; bindex++, hd++) {
- if (au_h_dptr(dentry, bindex))
- continue;
- h_dentry = hd->hd_dentry;
- if (!h_dentry)
- continue;
- AuDebugOn(d_is_negative(h_dentry));
- h_inode = d_inode(h_dentry);
- AuDebugOn(orig_h.mode
- != (h_inode->i_mode
- & S_IFMT));
- au_set_h_dptr(dentry, bindex,
- dget(h_dentry));
- }
- if (inode)
- err = au_refresh_hinode(inode, dentry);
- au_dbg_verify_dinode(dentry);
- }
- } else {
- AuDbg("positive --> positive, different type\n");
- /* similar to the behaviour of removing and creating */
- au_hide(dentry);
- if (inode)
- err = au_refresh_hinode_self(inode);
- au_dbg_verify_dinode(dentry);
- }
- }
-
-out:
- return err;
-}
-
-void au_refresh_dop(struct dentry *dentry, int force_reval)
-{
- const struct dentry_operations *dop
- = force_reval ? &aufs_dop : dentry->d_sb->s_d_op;
- static const unsigned int mask
- = DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE;
-
- BUILD_BUG_ON(sizeof(mask) != sizeof(dentry->d_flags));
-
- if (dentry->d_op == dop)
- return;
-
- AuDbg("%pd\n", dentry);
- spin_lock(&dentry->d_lock);
- if (dop == &aufs_dop)
- dentry->d_flags |= mask;
- else
- dentry->d_flags &= ~mask;
- dentry->d_op = dop;
- spin_unlock(&dentry->d_lock);
-}
-
-int au_refresh_dentry(struct dentry *dentry, struct dentry *parent)
-{
- int err, ebrange, nbr;
- unsigned int sigen;
- struct au_dinfo *dinfo, *tmp;
- struct super_block *sb;
- struct inode *inode;
-
- DiMustWriteLock(dentry);
- AuDebugOn(IS_ROOT(dentry));
- AuDebugOn(d_really_is_negative(parent));
-
- sb = dentry->d_sb;
- sigen = au_sigen(sb);
- err = au_digen_test(parent, sigen);
- if (unlikely(err))
- goto out;
-
- nbr = au_sbbot(sb) + 1;
- dinfo = au_di(dentry);
- err = au_di_realloc(dinfo, nbr, /*may_shrink*/0);
- if (unlikely(err))
- goto out;
- ebrange = au_dbrange_test(dentry);
- if (!ebrange)
- ebrange = au_do_refresh_hdentry(dentry, parent);
-
- if (d_unhashed(dentry) || ebrange /* || dinfo->di_tmpfile */) {
- AuDebugOn(au_dbtop(dentry) < 0 && au_dbbot(dentry) >= 0);
- if (d_really_is_positive(dentry)) {
- inode = d_inode(dentry);
- err = au_refresh_hinode_self(inode);
- }
- au_dbg_verify_dinode(dentry);
- if (!err)
- goto out_dgen; /* success */
- goto out;
- }
-
- /* temporary dinfo */
- AuDbgDentry(dentry);
- err = -ENOMEM;
- tmp = au_di_alloc(sb, AuLsc_DI_TMP);
- if (unlikely(!tmp))
- goto out;
- au_di_swap(tmp, dinfo);
- /* returns the number of positive dentries */
- /*
- * if current working dir is removed, it returns an error.
- * but the dentry is legal.
- */
- err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG);
- AuDbgDentry(dentry);
- au_di_swap(tmp, dinfo);
- if (err == -ENOENT)
- err = 0;
- if (err >= 0) {
- /* compare/refresh by dinfo */
- AuDbgDentry(dentry);
- err = au_refresh_by_dinfo(dentry, dinfo, tmp);
- au_dbg_verify_dinode(dentry);
- AuTraceErr(err);
- }
- au_di_realloc(dinfo, nbr, /*may_shrink*/1); /* harmless if err */
- au_rw_write_unlock(&tmp->di_rwsem);
- au_di_free(tmp);
- if (unlikely(err))
- goto out;
-
-out_dgen:
- au_update_digen(dentry);
-out:
- if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) {
- AuIOErr("failed refreshing %pd, %d\n", dentry, err);
- AuDbgDentry(dentry);
- }
- AuTraceErr(err);
- return err;
-}
-
-static int au_do_h_d_reval(struct dentry *h_dentry, unsigned int flags,
- struct dentry *dentry, aufs_bindex_t bindex)
-{
- int err, valid;
-
- err = 0;
- if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE))
- goto out;
-
- AuDbg("b%d\n", bindex);
- /*
- * gave up supporting LOOKUP_CREATE/OPEN for lower fs,
- * due to whiteout and branch permission.
- */
- flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE
- | LOOKUP_FOLLOW | LOOKUP_EXCL);
- /* it may return tri-state */
- valid = h_dentry->d_op->d_revalidate(h_dentry, flags);
-
- if (unlikely(valid < 0))
- err = valid;
- else if (!valid)
- err = -EINVAL;
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* todo: remove this */
-static int h_d_revalidate(struct dentry *dentry, struct inode *inode,
- unsigned int flags, int do_udba)
-{
- int err;
- umode_t mode, h_mode;
- aufs_bindex_t bindex, btail, btop, ibs, ibe;
- unsigned char plus, unhashed, is_root, h_plus, h_nfs, tmpfile;
- struct inode *h_inode, *h_cached_inode;
- struct dentry *h_dentry;
- struct qstr *name, *h_name;
-
- err = 0;
- plus = 0;
- mode = 0;
- ibs = -1;
- ibe = -1;
- unhashed = !!d_unhashed(dentry);
- is_root = !!IS_ROOT(dentry);
- name = &dentry->d_name;
- tmpfile = au_di(dentry)->di_tmpfile;
-
- /*
- * Theoretically, REVAL test should be unnecessary in case of
- * {FS,I}NOTIFY.
- * But {fs,i}notify doesn't fire some necessary events,
- * IN_ATTRIB for atime/nlink/pageio
- * Let's do REVAL test too.
- */
- if (do_udba && inode) {
- mode = (inode->i_mode & S_IFMT);
- plus = (inode->i_nlink > 0);
- ibs = au_ibtop(inode);
- ibe = au_ibbot(inode);
- }
-
- btop = au_dbtop(dentry);
- btail = btop;
- if (inode && S_ISDIR(inode->i_mode))
- btail = au_dbtaildir(dentry);
- for (bindex = btop; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
-
- AuDbg("b%d, %pd\n", bindex, h_dentry);
- h_nfs = !!au_test_nfs(h_dentry->d_sb);
- spin_lock(&h_dentry->d_lock);
- h_name = &h_dentry->d_name;
- if (unlikely(do_udba
- && !is_root
- && ((!h_nfs
- && (unhashed != !!d_unhashed(h_dentry)
- || (!tmpfile
- && !au_qstreq(name, h_name))
- ))
- || (h_nfs
- && !(flags & LOOKUP_OPEN)
- && (h_dentry->d_flags
- & DCACHE_NFSFS_RENAMED)))
- )) {
- int h_unhashed;
-
- h_unhashed = d_unhashed(h_dentry);
- spin_unlock(&h_dentry->d_lock);
- AuDbg("unhash 0x%x 0x%x, %pd %pd\n",
- unhashed, h_unhashed, dentry, h_dentry);
- goto err;
- }
- spin_unlock(&h_dentry->d_lock);
-
- err = au_do_h_d_reval(h_dentry, flags, dentry, bindex);
- if (unlikely(err))
- /* do not goto err, to keep the errno */
- break;
-
- /* todo: plink too? */
- if (!do_udba)
- continue;
-
- /* UDBA tests */
- if (unlikely(!!inode != d_is_positive(h_dentry)))
- goto err;
-
- h_inode = NULL;
- if (d_is_positive(h_dentry))
- h_inode = d_inode(h_dentry);
- h_plus = plus;
- h_mode = mode;
- h_cached_inode = h_inode;
- if (h_inode) {
- h_mode = (h_inode->i_mode & S_IFMT);
- h_plus = (h_inode->i_nlink > 0);
- }
- if (inode && ibs <= bindex && bindex <= ibe)
- h_cached_inode = au_h_iptr(inode, bindex);
-
- if (!h_nfs) {
- if (unlikely(plus != h_plus && !tmpfile))
- goto err;
- } else {
- if (unlikely(!(h_dentry->d_flags & DCACHE_NFSFS_RENAMED)
- && !is_root
- && !IS_ROOT(h_dentry)
- && unhashed != d_unhashed(h_dentry)))
- goto err;
- }
- if (unlikely(mode != h_mode
- || h_cached_inode != h_inode))
- goto err;
- continue;
-
-err:
- err = -EINVAL;
- break;
- }
-
- AuTraceErr(err);
- return err;
-}
-
-/* todo: consolidate with do_refresh() and au_reval_for_attr() */
-static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct dentry *parent;
-
- if (!au_digen_test(dentry, sigen))
- return 0;
-
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, AuLock_IR);
- AuDebugOn(au_digen_test(parent, sigen));
- au_dbg_verify_gen(parent, sigen);
- err = au_refresh_dentry(dentry, parent);
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
- AuTraceErr(err);
- return err;
-}
-
-int au_reval_dpath(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct dentry *d, *parent;
-
- if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR))
- return simple_reval_dpath(dentry, sigen);
-
- /* slow loop, keep it simple and stupid */
- /* cf: au_cpup_dirs() */
- err = 0;
- parent = NULL;
- while (au_digen_test(dentry, sigen)) {
- d = dentry;
- while (1) {
- dput(parent);
- parent = dget_parent(d);
- if (!au_digen_test(parent, sigen))
- break;
- d = parent;
- }
-
- if (d != dentry)
- di_write_lock_child2(d);
-
- /* someone might update our dentry while we were sleeping */
- if (au_digen_test(d, sigen)) {
- /*
- * todo: consolidate with simple_reval_dpath(),
- * do_refresh() and au_reval_for_attr().
- */
- di_read_lock_parent(parent, AuLock_IR);
- err = au_refresh_dentry(d, parent);
- di_read_unlock(parent, AuLock_IR);
- }
-
- if (d != dentry)
- di_write_unlock(d);
- dput(parent);
- if (unlikely(err))
- break;
- }
-
- return err;
-}
-
-/*
- * if valid returns 1, otherwise 0.
- */
-static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags)
-{
- int valid, err;
- unsigned int sigen;
- unsigned char do_udba;
- struct super_block *sb;
- struct inode *inode;
-
- /* todo: support rcu-walk? */
- if (flags & LOOKUP_RCU)
- return -ECHILD;
-
- valid = 0;
- if (unlikely(!au_di(dentry)))
- goto out;
-
- valid = 1;
- sb = dentry->d_sb;
- /*
- * todo: very ugly
- * i_mutex of parent dir may be held,
- * but we should not return 'invalid' due to busy.
- */
- err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
- if (unlikely(err)) {
- valid = err;
- AuTraceErr(err);
- goto out;
- }
- inode = NULL;
- if (d_really_is_positive(dentry))
- inode = d_inode(dentry);
- if (unlikely(inode && au_is_bad_inode(inode))) {
- err = -EINVAL;
- AuTraceErr(err);
- goto out_dgrade;
- }
- if (unlikely(au_dbrange_test(dentry))) {
- err = -EINVAL;
- AuTraceErr(err);
- goto out_dgrade;
- }
-
- sigen = au_sigen(sb);
- if (au_digen_test(dentry, sigen)) {
- AuDebugOn(IS_ROOT(dentry));
- err = au_reval_dpath(dentry, sigen);
- if (unlikely(err)) {
- AuTraceErr(err);
- goto out_dgrade;
- }
- }
- di_downgrade_lock(dentry, AuLock_IR);
-
- err = -EINVAL;
- if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY))
- && inode
- && !(inode->i_state && I_LINKABLE)
- && (IS_DEADDIR(inode) || !inode->i_nlink)) {
- AuTraceErr(err);
- goto out_inval;
- }
-
- do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
- if (do_udba && inode) {
- aufs_bindex_t btop = au_ibtop(inode);
- struct inode *h_inode;
-
- if (btop >= 0) {
- h_inode = au_h_iptr(inode, btop);
- if (h_inode && au_test_higen(inode, h_inode)) {
- AuTraceErr(err);
- goto out_inval;
- }
- }
- }
-
- err = h_d_revalidate(dentry, inode, flags, do_udba);
- if (unlikely(!err && do_udba && au_dbtop(dentry) < 0)) {
- err = -EIO;
- AuDbg("both of real entry and whiteout found, %p, err %d\n",
- dentry, err);
- }
- goto out_inval;
-
-out_dgrade:
- di_downgrade_lock(dentry, AuLock_IR);
-out_inval:
- aufs_read_unlock(dentry, AuLock_IR);
- AuTraceErr(err);
- valid = !err;
-out:
- if (!valid) {
- AuDbg("%pd invalid, %d\n", dentry, valid);
- d_drop(dentry);
- }
- return valid;
-}
-
-static void aufs_d_release(struct dentry *dentry)
-{
- if (au_di(dentry)) {
- au_di_fin(dentry);
- au_hn_di_reinit(dentry);
- }
-}
-
-const struct dentry_operations aufs_dop = {
- .d_revalidate = aufs_d_revalidate,
- .d_weak_revalidate = aufs_d_revalidate,
- .d_release = aufs_d_release
-};
-
-/* aufs_dop without d_revalidate */
-const struct dentry_operations aufs_dop_noreval = {
- .d_release = aufs_d_release
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * lookup and dentry operations
- */
-
-#ifndef __AUFS_DENTRY_H__
-#define __AUFS_DENTRY_H__
-
-#ifdef __KERNEL__
-
-#include <linux/dcache.h>
-#include "rwsem.h"
-
-struct au_hdentry {
- struct dentry *hd_dentry;
- aufs_bindex_t hd_id;
-};
-
-struct au_dinfo {
- atomic_t di_generation;
-
- struct au_rwsem di_rwsem;
- aufs_bindex_t di_btop, di_bbot, di_bwh, di_bdiropq;
- unsigned char di_tmpfile; /* to allow the different name */
- union {
- struct au_hdentry *di_hdentry;
- struct llist_node di_lnode; /* delayed free */
- };
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* flags for au_lkup_dentry() */
-#define AuLkup_ALLOW_NEG 1
-#define AuLkup_IGNORE_PERM (1 << 1)
-#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name)
-#define au_fset_lkup(flags, name) \
- do { (flags) |= AuLkup_##name; } while (0)
-#define au_fclr_lkup(flags, name) \
- do { (flags) &= ~AuLkup_##name; } while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* dentry.c */
-extern const struct dentry_operations aufs_dop, aufs_dop_noreval;
-struct au_branch;
-struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent);
-int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
- struct dentry *h_parent, struct au_branch *br);
-
-int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop,
- unsigned int flags);
-int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh);
-int au_refresh_dentry(struct dentry *dentry, struct dentry *parent);
-int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
-void au_refresh_dop(struct dentry *dentry, int force_reval);
-
-/* dinfo.c */
-void au_di_init_once(void *_di);
-struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc);
-void au_di_free(struct au_dinfo *dinfo);
-void au_di_swap(struct au_dinfo *a, struct au_dinfo *b);
-void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src);
-int au_di_init(struct dentry *dentry);
-void au_di_fin(struct dentry *dentry);
-int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink);
-
-void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
-void di_read_unlock(struct dentry *d, int flags);
-void di_downgrade_lock(struct dentry *d, int flags);
-void di_write_lock(struct dentry *d, unsigned int lsc);
-void di_write_unlock(struct dentry *d);
-void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
-void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
-void di_write_unlock2(struct dentry *d1, struct dentry *d2);
-
-struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
-struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex);
-aufs_bindex_t au_dbtail(struct dentry *dentry);
-aufs_bindex_t au_dbtaildir(struct dentry *dentry);
-
-void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_dentry);
-int au_digen_test(struct dentry *dentry, unsigned int sigen);
-int au_dbrange_test(struct dentry *dentry);
-void au_update_digen(struct dentry *dentry);
-void au_update_dbrange(struct dentry *dentry, int do_put_zero);
-void au_update_dbtop(struct dentry *dentry);
-void au_update_dbbot(struct dentry *dentry);
-int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_dinfo *au_di(struct dentry *dentry)
-{
- return dentry->d_fsdata;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for dinfo */
-enum {
- AuLsc_DI_CHILD, /* child first */
- AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */
- AuLsc_DI_CHILD3, /* copyup dirs */
- AuLsc_DI_PARENT,
- AuLsc_DI_PARENT2,
- AuLsc_DI_PARENT3,
- AuLsc_DI_TMP /* temp for replacing dinfo */
-};
-
-/*
- * di_read_lock_child, di_write_lock_child,
- * di_read_lock_child2, di_write_lock_child2,
- * di_read_lock_child3, di_write_lock_child3,
- * di_read_lock_parent, di_write_lock_parent,
- * di_read_lock_parent2, di_write_lock_parent2,
- * di_read_lock_parent3, di_write_lock_parent3,
- */
-#define AuReadLockFunc(name, lsc) \
-static inline void di_read_lock_##name(struct dentry *d, int flags) \
-{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
-
-#define AuWriteLockFunc(name, lsc) \
-static inline void di_write_lock_##name(struct dentry *d) \
-{ di_write_lock(d, AuLsc_DI_##lsc); }
-
-#define AuRWLockFuncs(name, lsc) \
- AuReadLockFunc(name, lsc) \
- AuWriteLockFunc(name, lsc)
-
-AuRWLockFuncs(child, CHILD);
-AuRWLockFuncs(child2, CHILD2);
-AuRWLockFuncs(child3, CHILD3);
-AuRWLockFuncs(parent, PARENT);
-AuRWLockFuncs(parent2, PARENT2);
-AuRWLockFuncs(parent3, PARENT3);
-
-#undef AuReadLockFunc
-#undef AuWriteLockFunc
-#undef AuRWLockFuncs
-
-#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem)
-#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem)
-#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: memory barrier? */
-static inline unsigned int au_digen(struct dentry *d)
-{
- return atomic_read(&au_di(d)->di_generation);
-}
-
-static inline void au_h_dentry_init(struct au_hdentry *hdentry)
-{
- hdentry->hd_dentry = NULL;
-}
-
-static inline struct au_hdentry *au_hdentry(struct au_dinfo *di,
- aufs_bindex_t bindex)
-{
- return di->di_hdentry + bindex;
-}
-
-static inline void au_hdput(struct au_hdentry *hd)
-{
- if (hd)
- dput(hd->hd_dentry);
-}
-
-static inline aufs_bindex_t au_dbtop(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_btop;
-}
-
-static inline aufs_bindex_t au_dbbot(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bbot;
-}
-
-static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bwh;
-}
-
-static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
-{
- DiMustAnyLock(dentry);
- return au_di(dentry)->di_bdiropq;
-}
-
-/* todo: hard/soft set? */
-static inline void au_set_dbtop(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_btop = bindex;
-}
-
-static inline void au_set_dbbot(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_bbot = bindex;
-}
-
-static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- /* dbwh can be outside of btop - bbot range */
- au_di(dentry)->di_bwh = bindex;
-}
-
-static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
-{
- DiMustWriteLock(dentry);
- au_di(dentry)->di_bdiropq = bindex;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_HNOTIFY
-static inline void au_digen_dec(struct dentry *d)
-{
- atomic_dec(&au_di(d)->di_generation);
-}
-
-static inline void au_hn_di_reinit(struct dentry *dentry)
-{
- dentry->d_fsdata = NULL;
-}
-#else
-AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
-#endif /* CONFIG_AUFS_HNOTIFY */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DENTRY_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * dentry private data
- */
-
-#include "aufs.h"
-
-void au_di_init_once(void *_dinfo)
-{
- struct au_dinfo *dinfo = _dinfo;
-
- au_rw_init(&dinfo->di_rwsem);
-}
-
-struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc)
-{
- struct au_dinfo *dinfo;
- int nbr, i;
-
- dinfo = au_cache_alloc_dinfo();
- if (unlikely(!dinfo))
- goto out;
-
- nbr = au_sbbot(sb) + 1;
- if (nbr <= 0)
- nbr = 1;
- dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
- if (dinfo->di_hdentry) {
- au_rw_write_lock_nested(&dinfo->di_rwsem, lsc);
- dinfo->di_btop = -1;
- dinfo->di_bbot = -1;
- dinfo->di_bwh = -1;
- dinfo->di_bdiropq = -1;
- dinfo->di_tmpfile = 0;
- for (i = 0; i < nbr; i++)
- dinfo->di_hdentry[i].hd_id = -1;
- goto out;
- }
-
- au_cache_dfree_dinfo(dinfo);
- dinfo = NULL;
-
-out:
- return dinfo;
-}
-
-void au_di_free(struct au_dinfo *dinfo)
-{
- struct au_hdentry *p;
- aufs_bindex_t bbot, bindex;
-
- /* dentry may not be revalidated */
- bindex = dinfo->di_btop;
- if (bindex >= 0) {
- bbot = dinfo->di_bbot;
- p = au_hdentry(dinfo, bindex);
- while (bindex++ <= bbot)
- au_hdput(p++);
- }
- au_delayed_kfree(dinfo->di_hdentry);
- au_cache_dfree_dinfo(dinfo);
-}
-
-void au_di_swap(struct au_dinfo *a, struct au_dinfo *b)
-{
- struct au_hdentry *p;
- aufs_bindex_t bi;
-
- AuRwMustWriteLock(&a->di_rwsem);
- AuRwMustWriteLock(&b->di_rwsem);
-
-#define DiSwap(v, name) \
- do { \
- v = a->di_##name; \
- a->di_##name = b->di_##name; \
- b->di_##name = v; \
- } while (0)
-
- DiSwap(p, hdentry);
- DiSwap(bi, btop);
- DiSwap(bi, bbot);
- DiSwap(bi, bwh);
- DiSwap(bi, bdiropq);
- /* smp_mb(); */
-
-#undef DiSwap
-}
-
-void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src)
-{
- AuRwMustWriteLock(&dst->di_rwsem);
- AuRwMustWriteLock(&src->di_rwsem);
-
- dst->di_btop = src->di_btop;
- dst->di_bbot = src->di_bbot;
- dst->di_bwh = src->di_bwh;
- dst->di_bdiropq = src->di_bdiropq;
- /* smp_mb(); */
-}
-
-int au_di_init(struct dentry *dentry)
-{
- int err;
- struct super_block *sb;
- struct au_dinfo *dinfo;
-
- err = 0;
- sb = dentry->d_sb;
- dinfo = au_di_alloc(sb, AuLsc_DI_CHILD);
- if (dinfo) {
- atomic_set(&dinfo->di_generation, au_sigen(sb));
- /* smp_mb(); */ /* atomic_set */
- dentry->d_fsdata = dinfo;
- } else
- err = -ENOMEM;
-
- return err;
-}
-
-void au_di_fin(struct dentry *dentry)
-{
- struct au_dinfo *dinfo;
-
- dinfo = au_di(dentry);
- AuRwDestroy(&dinfo->di_rwsem);
- au_di_free(dinfo);
-}
-
-int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink)
-{
- int err, sz;
- struct au_hdentry *hdp;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*hdp) * (dinfo->di_bbot + 1);
- if (!sz)
- sz = sizeof(*hdp);
- hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS,
- may_shrink);
- if (hdp) {
- dinfo->di_hdentry = hdp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_write_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_write_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_write_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_write_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_write_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_write_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_read_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_read_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_read_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_read_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_read_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_read_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
-{
- struct inode *inode;
-
- au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d_really_is_positive(d)) {
- inode = d_inode(d);
- if (au_ftest_lock(flags, IW))
- do_ii_write_lock(inode, lsc);
- else if (au_ftest_lock(flags, IR))
- do_ii_read_lock(inode, lsc);
- }
-}
-
-void di_read_unlock(struct dentry *d, int flags)
-{
- struct inode *inode;
-
- if (d_really_is_positive(d)) {
- inode = d_inode(d);
- if (au_ftest_lock(flags, IW)) {
- au_dbg_verify_dinode(d);
- ii_write_unlock(inode);
- } else if (au_ftest_lock(flags, IR)) {
- au_dbg_verify_dinode(d);
- ii_read_unlock(inode);
- }
- }
- au_rw_read_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_downgrade_lock(struct dentry *d, int flags)
-{
- if (d_really_is_positive(d) && au_ftest_lock(flags, IR))
- ii_downgrade_lock(d_inode(d));
- au_rw_dgrade_lock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock(struct dentry *d, unsigned int lsc)
-{
- au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d_really_is_positive(d))
- do_ii_write_lock(d_inode(d), lsc);
-}
-
-void di_write_unlock(struct dentry *d)
-{
- au_dbg_verify_dinode(d);
- if (d_really_is_positive(d))
- ii_write_unlock(d_inode(d));
- au_rw_write_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d_inode(d1) == d_inode(d2)
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_child(d1);
- di_write_lock_child2(d2);
- } else {
- /* there should be no races */
- di_write_lock_child(d2);
- di_write_lock_child2(d1);
- }
-}
-
-void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d_inode(d1) == d_inode(d2)
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_parent(d1);
- di_write_lock_parent2(d2);
- } else {
- /* there should be no races */
- di_write_lock_parent(d2);
- di_write_lock_parent2(d1);
- }
-}
-
-void di_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock(d1);
- if (d_inode(d1) == d_inode(d2))
- au_rw_write_unlock(&au_di(d2)->di_rwsem);
- else
- di_write_unlock(d2);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct dentry *d;
-
- DiMustAnyLock(dentry);
-
- if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry))
- return NULL;
- AuDebugOn(bindex < 0);
- d = au_hdentry(au_di(dentry), bindex)->hd_dentry;
- AuDebugOn(d && au_dcount(d) <= 0);
- return d;
-}
-
-/*
- * extended version of au_h_dptr().
- * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or
- * error.
- */
-struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct dentry *h_dentry;
- struct inode *inode, *h_inode;
-
- AuDebugOn(d_really_is_negative(dentry));
-
- h_dentry = NULL;
- if (au_dbtop(dentry) <= bindex
- && bindex <= au_dbbot(dentry))
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && !au_d_linkable(h_dentry)) {
- dget(h_dentry);
- goto out; /* success */
- }
-
- inode = d_inode(dentry);
- AuDebugOn(bindex < au_ibtop(inode));
- AuDebugOn(au_ibbot(inode) < bindex);
- h_inode = au_h_iptr(inode, bindex);
- h_dentry = d_find_alias(h_inode);
- if (h_dentry) {
- if (!IS_ERR(h_dentry)) {
- if (!au_d_linkable(h_dentry))
- goto out; /* success */
- dput(h_dentry);
- } else
- goto out;
- }
-
- if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) {
- h_dentry = au_plink_lkup(inode, bindex);
- AuDebugOn(!h_dentry);
- if (!IS_ERR(h_dentry)) {
- if (!au_d_hashed_positive(h_dentry))
- goto out; /* success */
- dput(h_dentry);
- h_dentry = NULL;
- }
- }
-
-out:
- AuDbgDentry(h_dentry);
- return h_dentry;
-}
-
-aufs_bindex_t au_dbtail(struct dentry *dentry)
-{
- aufs_bindex_t bbot, bwh;
-
- bbot = au_dbbot(dentry);
- if (0 <= bbot) {
- bwh = au_dbwh(dentry);
- if (!bwh)
- return bwh;
- if (0 < bwh && bwh < bbot)
- return bwh - 1;
- }
- return bbot;
-}
-
-aufs_bindex_t au_dbtaildir(struct dentry *dentry)
-{
- aufs_bindex_t bbot, bopq;
-
- bbot = au_dbtail(dentry);
- if (0 <= bbot) {
- bopq = au_dbdiropq(dentry);
- if (0 <= bopq && bopq < bbot)
- bbot = bopq;
- }
- return bbot;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_dentry)
-{
- struct au_dinfo *dinfo;
- struct au_hdentry *hd;
- struct au_branch *br;
-
- DiMustWriteLock(dentry);
-
- dinfo = au_di(dentry);
- hd = au_hdentry(dinfo, bindex);
- au_hdput(hd);
- hd->hd_dentry = h_dentry;
- if (h_dentry) {
- br = au_sbr(dentry->d_sb, bindex);
- hd->hd_id = br->br_id;
- }
-}
-
-int au_dbrange_test(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t btop, bbot;
-
- err = 0;
- btop = au_dbtop(dentry);
- bbot = au_dbbot(dentry);
- if (btop >= 0)
- AuDebugOn(bbot < 0 && btop > bbot);
- else {
- err = -EIO;
- AuDebugOn(bbot >= 0);
- }
-
- return err;
-}
-
-int au_digen_test(struct dentry *dentry, unsigned int sigen)
-{
- int err;
-
- err = 0;
- if (unlikely(au_digen(dentry) != sigen
- || au_iigen_test(d_inode(dentry), sigen)))
- err = -EIO;
-
- return err;
-}
-
-void au_update_digen(struct dentry *dentry)
-{
- atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
- /* smp_mb(); */ /* atomic_set */
-}
-
-void au_update_dbrange(struct dentry *dentry, int do_put_zero)
-{
- struct au_dinfo *dinfo;
- struct dentry *h_d;
- struct au_hdentry *hdp;
- aufs_bindex_t bindex, bbot;
-
- DiMustWriteLock(dentry);
-
- dinfo = au_di(dentry);
- if (!dinfo || dinfo->di_btop < 0)
- return;
-
- if (do_put_zero) {
- bbot = dinfo->di_bbot;
- bindex = dinfo->di_btop;
- hdp = au_hdentry(dinfo, bindex);
- for (; bindex <= bbot; bindex++, hdp++) {
- h_d = hdp->hd_dentry;
- if (h_d && d_is_negative(h_d))
- au_set_h_dptr(dentry, bindex, NULL);
- }
- }
-
- dinfo->di_btop = 0;
- hdp = au_hdentry(dinfo, dinfo->di_btop);
- for (; dinfo->di_btop <= dinfo->di_bbot; dinfo->di_btop++, hdp++)
- if (hdp->hd_dentry)
- break;
- if (dinfo->di_btop > dinfo->di_bbot) {
- dinfo->di_btop = -1;
- dinfo->di_bbot = -1;
- return;
- }
-
- hdp = au_hdentry(dinfo, dinfo->di_bbot);
- for (; dinfo->di_bbot >= 0; dinfo->di_bbot--, hdp--)
- if (hdp->hd_dentry)
- break;
- AuDebugOn(dinfo->di_btop > dinfo->di_bbot || dinfo->di_bbot < 0);
-}
-
-void au_update_dbtop(struct dentry *dentry)
-{
- aufs_bindex_t bindex, bbot;
- struct dentry *h_dentry;
-
- bbot = au_dbbot(dentry);
- for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (d_is_positive(h_dentry)) {
- au_set_dbtop(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-void au_update_dbbot(struct dentry *dentry)
-{
- aufs_bindex_t bindex, btop;
- struct dentry *h_dentry;
-
- btop = au_dbtop(dentry);
- for (bindex = au_dbbot(dentry); bindex >= btop; bindex--) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (d_is_positive(h_dentry)) {
- au_set_dbbot(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
-{
- aufs_bindex_t bindex, bbot;
-
- bbot = au_dbbot(dentry);
- for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++)
- if (au_h_dptr(dentry, bindex) == h_dentry)
- return bindex;
- return -1;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * directory operations
- */
-
-#include <linux/fs_stack.h>
-#include "aufs.h"
-
-void au_add_nlink(struct inode *dir, struct inode *h_dir)
-{
- unsigned int nlink;
-
- AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-
- nlink = dir->i_nlink;
- nlink += h_dir->i_nlink - 2;
- if (h_dir->i_nlink < 2)
- nlink += 2;
- smp_mb(); /* for i_nlink */
- /* 0 can happen in revaliding */
- set_nlink(dir, nlink);
-}
-
-void au_sub_nlink(struct inode *dir, struct inode *h_dir)
-{
- unsigned int nlink;
-
- AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-
- nlink = dir->i_nlink;
- nlink -= h_dir->i_nlink - 2;
- if (h_dir->i_nlink < 2)
- nlink -= 2;
- smp_mb(); /* for i_nlink */
- /* nlink == 0 means the branch-fs is broken */
- set_nlink(dir, nlink);
-}
-
-loff_t au_dir_size(struct file *file, struct dentry *dentry)
-{
- loff_t sz;
- aufs_bindex_t bindex, bbot;
- struct file *h_file;
- struct dentry *h_dentry;
-
- sz = 0;
- if (file) {
- AuDebugOn(!d_is_dir(file->f_path.dentry));
-
- bbot = au_fbbot_dir(file);
- for (bindex = au_fbtop(file);
- bindex <= bbot && sz < KMALLOC_MAX_SIZE;
- bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (h_file && file_inode(h_file))
- sz += vfsub_f_size_read(h_file);
- }
- } else {
- AuDebugOn(!dentry);
- AuDebugOn(!d_is_dir(dentry));
-
- bbot = au_dbtaildir(dentry);
- for (bindex = au_dbtop(dentry);
- bindex <= bbot && sz < KMALLOC_MAX_SIZE;
- bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && d_is_positive(h_dentry))
- sz += i_size_read(d_inode(h_dentry));
- }
- }
- if (sz < KMALLOC_MAX_SIZE)
- sz = roundup_pow_of_two(sz);
- if (sz > KMALLOC_MAX_SIZE)
- sz = KMALLOC_MAX_SIZE;
- else if (sz < NAME_MAX) {
- BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
- sz = AUFS_RDBLK_DEF;
- }
- return sz;
-}
-
-struct au_dir_ts_arg {
- struct dentry *dentry;
- aufs_bindex_t brid;
-};
-
-static void au_do_dir_ts(void *arg)
-{
- struct au_dir_ts_arg *a = arg;
- struct au_dtime dt;
- struct path h_path;
- struct inode *dir, *h_dir;
- struct super_block *sb;
- struct au_branch *br;
- struct au_hinode *hdir;
- int err;
- aufs_bindex_t btop, bindex;
-
- sb = a->dentry->d_sb;
- if (d_really_is_negative(a->dentry))
- goto out;
- /* no dir->i_mutex lock */
- aufs_read_lock(a->dentry, AuLock_DW); /* noflush */
-
- dir = d_inode(a->dentry);
- btop = au_ibtop(dir);
- bindex = au_br_index(sb, a->brid);
- if (bindex < btop)
- goto out_unlock;
-
- br = au_sbr(sb, bindex);
- h_path.dentry = au_h_dptr(a->dentry, bindex);
- if (!h_path.dentry)
- goto out_unlock;
- h_path.mnt = au_br_mnt(br);
- au_dtime_store(&dt, a->dentry, &h_path);
-
- br = au_sbr(sb, btop);
- if (!au_br_writable(br->br_perm))
- goto out_unlock;
- h_path.dentry = au_h_dptr(a->dentry, btop);
- h_path.mnt = au_br_mnt(br);
- err = vfsub_mnt_want_write(h_path.mnt);
- if (err)
- goto out_unlock;
- hdir = au_hi(dir, btop);
- au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
- h_dir = au_h_iptr(dir, btop);
- if (h_dir->i_nlink
- && timespec_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) {
- dt.dt_h_path = h_path;
- au_dtime_revert(&dt);
- }
- au_hn_inode_unlock(hdir);
- vfsub_mnt_drop_write(h_path.mnt);
- au_cpup_attr_timesizes(dir);
-
-out_unlock:
- aufs_read_unlock(a->dentry, AuLock_DW);
-out:
- dput(a->dentry);
- au_nwt_done(&au_sbi(sb)->si_nowait);
- au_delayed_kfree(arg);
-}
-
-void au_dir_ts(struct inode *dir, aufs_bindex_t bindex)
-{
- int perm, wkq_err;
- aufs_bindex_t btop;
- struct au_dir_ts_arg *arg;
- struct dentry *dentry;
- struct super_block *sb;
-
- IMustLock(dir);
-
- dentry = d_find_any_alias(dir);
- AuDebugOn(!dentry);
- sb = dentry->d_sb;
- btop = au_ibtop(dir);
- if (btop == bindex) {
- au_cpup_attr_timesizes(dir);
- goto out;
- }
-
- perm = au_sbr_perm(sb, btop);
- if (!au_br_writable(perm))
- goto out;
-
- arg = kmalloc(sizeof(*arg), GFP_NOFS);
- if (!arg)
- goto out;
-
- arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */
- arg->brid = au_sbr_id(sb, bindex);
- wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0);
- if (unlikely(wkq_err)) {
- pr_err("wkq %d\n", wkq_err);
- dput(dentry);
- au_delayed_kfree(arg);
- }
-
-out:
- dput(dentry);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int reopen_dir(struct file *file)
-{
- int err;
- unsigned int flags;
- aufs_bindex_t bindex, btail, btop;
- struct dentry *dentry, *h_dentry;
- struct file *h_file;
-
- /* open all lower dirs */
- dentry = file->f_path.dentry;
- btop = au_dbtop(dentry);
- for (bindex = au_fbtop(file); bindex < btop; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbtop(file, btop);
-
- btail = au_dbtaildir(dentry);
- for (bindex = au_fbbot_dir(file); btail < bindex; bindex--)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbbot_dir(file, btail);
-
- flags = vfsub_file_flags(file);
- for (bindex = btop; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- h_file = au_hf_dir(file, bindex);
- if (h_file)
- continue;
-
- h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out; /* close all? */
- au_set_h_fptr(file, bindex, h_file);
- }
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- err = 0;
-
-out:
- return err;
-}
-
-static int do_open_dir(struct file *file, int flags, struct file *h_file)
-{
- int err;
- aufs_bindex_t bindex, btail;
- struct dentry *dentry, *h_dentry;
- struct vfsmount *mnt;
-
- FiMustWriteLock(file);
- AuDebugOn(h_file);
-
- err = 0;
- mnt = file->f_path.mnt;
- dentry = file->f_path.dentry;
- file->f_version = d_inode(dentry)->i_version;
- bindex = au_dbtop(dentry);
- au_set_fbtop(file, bindex);
- btail = au_dbtaildir(dentry);
- au_set_fbbot_dir(file, btail);
- for (; !err && bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
-
- err = vfsub_test_mntns(mnt, h_dentry->d_sb);
- if (unlikely(err))
- break;
- h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
- if (IS_ERR(h_file)) {
- err = PTR_ERR(h_file);
- break;
- }
- au_set_h_fptr(file, bindex, h_file);
- }
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- if (!err)
- return 0; /* success */
-
- /* close all */
- for (bindex = au_fbtop(file); bindex <= btail; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- au_set_fbtop(file, -1);
- au_set_fbbot_dir(file, -1);
-
- return err;
-}
-
-static int aufs_open_dir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- int err;
- struct super_block *sb;
- struct au_fidir *fidir;
-
- err = -ENOMEM;
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- fidir = au_fidir_alloc(sb);
- if (fidir) {
- struct au_do_open_args args = {
- .open = do_open_dir,
- .fidir = fidir
- };
- err = au_do_open(file, &args);
- if (unlikely(err))
- au_delayed_kfree(fidir);
- }
- si_read_unlock(sb);
- return err;
-}
-
-static int aufs_release_dir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- struct au_vdir *vdir_cache;
- struct au_finfo *finfo;
- struct au_fidir *fidir;
- struct au_hfile *hf;
- aufs_bindex_t bindex, bbot;
- int execed, delayed;
-
- delayed = (current->flags & PF_KTHREAD) || in_interrupt();
- finfo = au_fi(file);
- fidir = finfo->fi_hdir;
- if (fidir) {
- au_sphl_del(&finfo->fi_hlist,
- &au_sbi(file->f_path.dentry->d_sb)->si_files);
- vdir_cache = fidir->fd_vdir_cache; /* lock-free */
- if (vdir_cache)
- au_vdir_free(vdir_cache, delayed);
-
- bindex = finfo->fi_btop;
- if (bindex >= 0) {
- execed = vfsub_file_execed(file);
- hf = fidir->fd_hfile + bindex;
- /*
- * calls fput() instead of filp_close(),
- * since no dnotify or lock for the lower file.
- */
- bbot = fidir->fd_bbot;
- for (; bindex <= bbot; bindex++, hf++)
- if (hf->hf_file)
- au_hfput(hf, execed);
- }
- au_delayed_kfree(fidir);
- finfo->fi_hdir = NULL;
- }
- au_finfo_fin(file, delayed);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_flush_dir(struct file *file, fl_owner_t id)
-{
- int err;
- aufs_bindex_t bindex, bbot;
- struct file *h_file;
-
- err = 0;
- bbot = au_fbbot_dir(file);
- for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (h_file)
- err = vfsub_flush(h_file, id);
- }
- return err;
-}
-
-static int aufs_flush_dir(struct file *file, fl_owner_t id)
-{
- return au_do_flush(file, id, au_do_flush_dir);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync)
-{
- int err;
- aufs_bindex_t bbot, bindex;
- struct inode *inode;
- struct super_block *sb;
-
- err = 0;
- sb = dentry->d_sb;
- inode = d_inode(dentry);
- IMustLock(inode);
- bbot = au_dbbot(dentry);
- for (bindex = au_dbtop(dentry); !err && bindex <= bbot; bindex++) {
- struct path h_path;
-
- if (au_test_ro(sb, bindex, inode))
- continue;
- h_path.dentry = au_h_dptr(dentry, bindex);
- if (!h_path.dentry)
- continue;
-
- h_path.mnt = au_sbr_mnt(sb, bindex);
- err = vfsub_fsync(NULL, &h_path, datasync);
- }
-
- return err;
-}
-
-static int au_do_fsync_dir(struct file *file, int datasync)
-{
- int err;
- aufs_bindex_t bbot, bindex;
- struct file *h_file;
- struct super_block *sb;
- struct inode *inode;
-
- err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
- if (unlikely(err))
- goto out;
-
- inode = file_inode(file);
- sb = inode->i_sb;
- bbot = au_fbbot_dir(file);
- for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) {
- h_file = au_hf_dir(file, bindex);
- if (!h_file || au_test_ro(sb, bindex, inode))
- continue;
-
- err = vfsub_fsync(h_file, &h_file->f_path, datasync);
- }
-
-out:
- return err;
-}
-
-/*
- * @file may be NULL
- */
-static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end,
- int datasync)
-{
- int err;
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
-
- err = 0;
- dentry = file->f_path.dentry;
- inode = d_inode(dentry);
- inode_lock(inode);
- sb = dentry->d_sb;
- si_noflush_read_lock(sb);
- if (file)
- err = au_do_fsync_dir(file, datasync);
- else {
- di_write_lock_child(dentry);
- err = au_do_fsync_dir_no_file(dentry, datasync);
- }
- au_cpup_attr_timesizes(inode);
- di_write_unlock(dentry);
- if (file)
- fi_write_unlock(file);
-
- si_read_unlock(sb);
- inode_unlock(inode);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_iterate_shared(struct file *file, struct dir_context *ctx)
-{
- int err;
- struct dentry *dentry;
- struct inode *inode, *h_inode;
- struct super_block *sb;
-
- AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);
-
- dentry = file->f_path.dentry;
- inode = d_inode(dentry);
- IMustLock(inode);
-
- sb = dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
- if (unlikely(err))
- goto out;
- err = au_alive_dir(dentry);
- if (!err)
- err = au_vdir_init(file);
- di_downgrade_lock(dentry, AuLock_IR);
- if (unlikely(err))
- goto out_unlock;
-
- h_inode = au_h_iptr(inode, au_ibtop(inode));
- if (!au_test_nfsd()) {
- err = au_vdir_fill_de(file, ctx);
- fsstack_copy_attr_atime(inode, h_inode);
- } else {
- /*
- * nfsd filldir may call lookup_one_len(), vfs_getattr(),
- * encode_fh() and others.
- */
- atomic_inc(&h_inode->i_count);
- di_read_unlock(dentry, AuLock_IR);
- si_read_unlock(sb);
- err = au_vdir_fill_de(file, ctx);
- fsstack_copy_attr_atime(inode, h_inode);
- fi_write_unlock(file);
- iput(h_inode);
-
- AuTraceErr(err);
- return err;
- }
-
-out_unlock:
- di_read_unlock(dentry, AuLock_IR);
- fi_write_unlock(file);
-out:
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define AuTestEmpty_WHONLY 1
-#define AuTestEmpty_CALLED (1 << 1)
-#define AuTestEmpty_SHWH (1 << 2)
-#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name)
-#define au_fset_testempty(flags, name) \
- do { (flags) |= AuTestEmpty_##name; } while (0)
-#define au_fclr_testempty(flags, name) \
- do { (flags) &= ~AuTestEmpty_##name; } while (0)
-
-#ifndef CONFIG_AUFS_SHWH
-#undef AuTestEmpty_SHWH
-#define AuTestEmpty_SHWH 0
-#endif
-
-struct test_empty_arg {
- struct dir_context ctx;
- struct au_nhash *whlist;
- unsigned int flags;
- int err;
- aufs_bindex_t bindex;
-};
-
-static int test_empty_cb(struct dir_context *ctx, const char *__name,
- int namelen, loff_t offset __maybe_unused, u64 ino,
- unsigned int d_type)
-{
- struct test_empty_arg *arg = container_of(ctx, struct test_empty_arg,
- ctx);
- char *name = (void *)__name;
-
- arg->err = 0;
- au_fset_testempty(arg->flags, CALLED);
- /* smp_mb(); */
- if (name[0] == '.'
- && (namelen == 1 || (name[1] == '.' && namelen == 2)))
- goto out; /* success */
-
- if (namelen <= AUFS_WH_PFX_LEN
- || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- if (au_ftest_testempty(arg->flags, WHONLY)
- && !au_nhash_test_known_wh(arg->whlist, name, namelen))
- arg->err = -ENOTEMPTY;
- goto out;
- }
-
- name += AUFS_WH_PFX_LEN;
- namelen -= AUFS_WH_PFX_LEN;
- if (!au_nhash_test_known_wh(arg->whlist, name, namelen))
- arg->err = au_nhash_append_wh
- (arg->whlist, name, namelen, ino, d_type, arg->bindex,
- au_ftest_testempty(arg->flags, SHWH));
-
-out:
- /* smp_mb(); */
- AuTraceErr(arg->err);
- return arg->err;
-}
-
-static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-{
- int err;
- struct file *h_file;
-
- h_file = au_h_open(dentry, arg->bindex,
- O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE,
- /*file*/NULL, /*force_wr*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = 0;
- if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
- && !file_inode(h_file)->i_nlink)
- goto out_put;
-
- do {
- arg->err = 0;
- au_fclr_testempty(arg->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_iterate_dir(h_file, &arg->ctx);
- if (err >= 0)
- err = arg->err;
- } while (!err && au_ftest_testempty(arg->flags, CALLED));
-
-out_put:
- fput(h_file);
- au_sbr_put(dentry->d_sb, arg->bindex);
-out:
- return err;
-}
-
-struct do_test_empty_args {
- int *errp;
- struct dentry *dentry;
- struct test_empty_arg *arg;
-};
-
-static void call_do_test_empty(void *args)
-{
- struct do_test_empty_args *a = args;
- *a->errp = do_test_empty(a->dentry, a->arg);
-}
-
-static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-{
- int err, wkq_err;
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- h_dentry = au_h_dptr(dentry, arg->bindex);
- h_inode = d_inode(h_dentry);
- /* todo: i_mode changes anytime? */
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ);
- inode_unlock(h_inode);
- if (!err)
- err = do_test_empty(dentry, arg);
- else {
- struct do_test_empty_args args = {
- .errp = &err,
- .dentry = dentry,
- .arg = arg
- };
- unsigned int flags = arg->flags;
-
- wkq_err = au_wkq_wait(call_do_test_empty, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- arg->flags = flags;
- }
-
- return err;
-}
-
-int au_test_empty_lower(struct dentry *dentry)
-{
- int err;
- unsigned int rdhash;
- aufs_bindex_t bindex, btop, btail;
- struct au_nhash whlist;
- struct test_empty_arg arg = {
- .ctx = {
- .actor = test_empty_cb
- }
- };
- int (*test_empty)(struct dentry *dentry, struct test_empty_arg *arg);
-
- SiMustAnyLock(dentry->d_sb);
-
- rdhash = au_sbi(dentry->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry));
- err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
-
- arg.flags = 0;
- arg.whlist = &whlist;
- btop = au_dbtop(dentry);
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
- au_fset_testempty(arg.flags, SHWH);
- test_empty = do_test_empty;
- if (au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1))
- test_empty = sio_test_empty;
- arg.bindex = btop;
- err = test_empty(dentry, &arg);
- if (unlikely(err))
- goto out_whlist;
-
- au_fset_testempty(arg.flags, WHONLY);
- btail = au_dbtaildir(dentry);
- for (bindex = btop + 1; !err && bindex <= btail; bindex++) {
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && d_is_positive(h_dentry)) {
- arg.bindex = bindex;
- err = test_empty(dentry, &arg);
- }
- }
-
-out_whlist:
- au_nhash_wh_free(&whlist);
-out:
- return err;
-}
-
-int au_test_empty(struct dentry *dentry, struct au_nhash *whlist)
-{
- int err;
- struct test_empty_arg arg = {
- .ctx = {
- .actor = test_empty_cb
- }
- };
- aufs_bindex_t bindex, btail;
-
- err = 0;
- arg.whlist = whlist;
- arg.flags = AuTestEmpty_WHONLY;
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
- au_fset_testempty(arg.flags, SHWH);
- btail = au_dbtaildir(dentry);
- for (bindex = au_dbtop(dentry); !err && bindex <= btail; bindex++) {
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && d_is_positive(h_dentry)) {
- arg.bindex = bindex;
- err = sio_test_empty(dentry, &arg);
- }
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-const struct file_operations aufs_dir_fop = {
- .owner = THIS_MODULE,
- .llseek = default_llseek,
- .read = generic_read_dir,
- .iterate_shared = aufs_iterate_shared,
- .unlocked_ioctl = aufs_ioctl_dir,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = aufs_compat_ioctl_dir,
-#endif
- .open = aufs_open_dir,
- .release = aufs_release_dir,
- .flush = aufs_flush_dir,
- .fsync = aufs_fsync_dir
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * directory operations
- */
-
-#ifndef __AUFS_DIR_H__
-#define __AUFS_DIR_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-
-/* ---------------------------------------------------------------------- */
-
-/* need to be faster and smaller */
-
-struct au_nhash {
- unsigned int nh_num;
- struct hlist_head *nh_head;
-};
-
-struct au_vdir_destr {
- unsigned char len;
- unsigned char name[0];
-} __packed;
-
-struct au_vdir_dehstr {
- struct hlist_node hash;
- union {
- struct au_vdir_destr *str;
- struct llist_node lnode; /* delayed free */
- };
-} ____cacheline_aligned_in_smp;
-
-struct au_vdir_de {
- ino_t de_ino;
- unsigned char de_type;
- /* caution: packed */
- struct au_vdir_destr de_str;
-} __packed;
-
-struct au_vdir_wh {
- struct hlist_node wh_hash;
-#ifdef CONFIG_AUFS_SHWH
- ino_t wh_ino;
- aufs_bindex_t wh_bindex;
- unsigned char wh_type;
-#else
- aufs_bindex_t wh_bindex;
-#endif
- /* caution: packed */
- struct au_vdir_destr wh_str;
-} __packed;
-
-union au_vdir_deblk_p {
- unsigned char *deblk;
- struct au_vdir_de *de;
-};
-
-struct au_vdir {
- unsigned char **vd_deblk;
- unsigned long vd_nblk;
- struct {
- unsigned long ul;
- union au_vdir_deblk_p p;
- } vd_last;
-
- unsigned long vd_version;
- unsigned int vd_deblk_sz;
- union {
- unsigned long vd_jiffy;
- struct llist_node vd_lnode; /* delayed free */
- };
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* dir.c */
-extern const struct file_operations aufs_dir_fop;
-void au_add_nlink(struct inode *dir, struct inode *h_dir);
-void au_sub_nlink(struct inode *dir, struct inode *h_dir);
-loff_t au_dir_size(struct file *file, struct dentry *dentry);
-void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc);
-int au_test_empty_lower(struct dentry *dentry);
-int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);
-
-/* vdir.c */
-unsigned int au_rdhash_est(loff_t sz);
-int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
-void au_nhash_wh_free(struct au_nhash *whlist);
-int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
- int limit);
-int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
-int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
- unsigned int d_type, aufs_bindex_t bindex,
- unsigned char shwh);
-void au_vdir_free(struct au_vdir *vdir, int atonce);
-int au_vdir_init(struct file *file);
-int au_vdir_fill_de(struct file *file, struct dir_context *ctx);
-
-/* ioctl.c */
-long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
-
-#ifdef CONFIG_AUFS_RDU
-/* rdu.c */
-long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-#ifdef CONFIG_COMPAT
-long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg);
-#endif
-#else
-AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file,
- unsigned int cmd, unsigned long arg)
-#ifdef CONFIG_COMPAT
-AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file,
- unsigned int cmd, unsigned long arg)
-#endif
-#endif
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DIR_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2010-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * dynamically customizable operations for regular files
- */
-
-#include "aufs.h"
-
-#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop)
-
-/*
- * How large will these lists be?
- * Usually just a few elements, 20-30 at most for each, I guess.
- */
-static struct au_sphlhead dynop[AuDyLast];
-
-static struct au_dykey *dy_gfind_get(struct au_sphlhead *sphl, const void *h_op)
-{
- struct au_dykey *key, *tmp;
- struct hlist_head *head;
-
- key = NULL;
- head = &sphl->head;
- rcu_read_lock();
- hlist_for_each_entry_rcu(tmp, head, dk_hnode)
- if (tmp->dk_op.dy_hop == h_op) {
- key = tmp;
- kref_get(&key->dk_kref);
- break;
- }
- rcu_read_unlock();
-
- return key;
-}
-
-static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key)
-{
- struct au_dykey **k, *found;
- const void *h_op = key->dk_op.dy_hop;
- int i;
-
- found = NULL;
- k = br->br_dykey;
- for (i = 0; i < AuBrDynOp; i++)
- if (k[i]) {
- if (k[i]->dk_op.dy_hop == h_op) {
- found = k[i];
- break;
- }
- } else
- break;
- if (!found) {
- spin_lock(&br->br_dykey_lock);
- for (; i < AuBrDynOp; i++)
- if (k[i]) {
- if (k[i]->dk_op.dy_hop == h_op) {
- found = k[i];
- break;
- }
- } else {
- k[i] = key;
- break;
- }
- spin_unlock(&br->br_dykey_lock);
- BUG_ON(i == AuBrDynOp); /* expand the array */
- }
-
- return found;
-}
-
-/* kref_get() if @key is already added */
-static struct au_dykey *dy_gadd(struct au_sphlhead *sphl, struct au_dykey *key)
-{
- struct au_dykey *tmp, *found;
- struct hlist_head *head;
- const void *h_op = key->dk_op.dy_hop;
-
- found = NULL;
- head = &sphl->head;
- spin_lock(&sphl->spin);
- hlist_for_each_entry(tmp, head, dk_hnode)
- if (tmp->dk_op.dy_hop == h_op) {
- kref_get(&tmp->dk_kref);
- found = tmp;
- break;
- }
- if (!found)
- hlist_add_head_rcu(&key->dk_hnode, head);
- spin_unlock(&sphl->spin);
-
- if (!found)
- DyPrSym(key);
- return found;
-}
-
-static void dy_free_rcu(struct rcu_head *rcu)
-{
- struct au_dykey *key;
-
- key = container_of(rcu, struct au_dykey, dk_rcu);
- DyPrSym(key);
- kfree(key); /* not delayed */
-}
-
-static void dy_free(struct kref *kref)
-{
- struct au_dykey *key;
- struct au_sphlhead *sphl;
-
- key = container_of(kref, struct au_dykey, dk_kref);
- sphl = dynop + key->dk_op.dy_type;
- au_sphl_del_rcu(&key->dk_hnode, sphl);
- call_rcu(&key->dk_rcu, dy_free_rcu);
-}
-
-void au_dy_put(struct au_dykey *key)
-{
- kref_put(&key->dk_kref, dy_free);
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *))
-
-#ifdef CONFIG_AUFS_DEBUG
-#define DyDbgDeclare(cnt) unsigned int cnt = 0
-#define DyDbgInc(cnt) do { cnt++; } while (0)
-#else
-#define DyDbgDeclare(cnt) do {} while (0)
-#define DyDbgInc(cnt) do {} while (0)
-#endif
-
-#define DySet(func, dst, src, h_op, h_sb) do { \
- DyDbgInc(cnt); \
- if (h_op->func) { \
- if (src.func) \
- dst.func = src.func; \
- else \
- AuDbg("%s %s\n", au_sbtype(h_sb), #func); \
- } \
-} while (0)
-
-#define DySetForce(func, dst, src) do { \
- AuDebugOn(!src.func); \
- DyDbgInc(cnt); \
- dst.func = src.func; \
-} while (0)
-
-#define DySetAop(func) \
- DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb)
-#define DySetAopForce(func) \
- DySetForce(func, dyaop->da_op, aufs_aop)
-
-static void dy_aop(struct au_dykey *key, const void *h_op,
- struct super_block *h_sb __maybe_unused)
-{
- struct au_dyaop *dyaop = (void *)key;
- const struct address_space_operations *h_aop = h_op;
- DyDbgDeclare(cnt);
-
- AuDbg("%s\n", au_sbtype(h_sb));
-
- DySetAop(writepage);
- DySetAopForce(readpage); /* force */
- DySetAop(writepages);
- DySetAop(set_page_dirty);
- DySetAop(readpages);
- DySetAop(write_begin);
- DySetAop(write_end);
- DySetAop(bmap);
- DySetAop(invalidatepage);
- DySetAop(releasepage);
- DySetAop(freepage);
- /* this one will be changed according to an aufs mount option */
- DySetAop(direct_IO);
- DySetAop(migratepage);
- DySetAop(isolate_page);
- DySetAop(putback_page);
- DySetAop(launder_page);
- DySetAop(is_partially_uptodate);
- DySetAop(is_dirty_writeback);
- DySetAop(error_remove_page);
- DySetAop(swap_activate);
- DySetAop(swap_deactivate);
-
- DyDbgSize(cnt, *h_aop);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void dy_bug(struct kref *kref)
-{
- BUG();
-}
-
-static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br)
-{
- struct au_dykey *key, *old;
- struct au_sphlhead *sphl;
- struct op {
- unsigned int sz;
- void (*set)(struct au_dykey *key, const void *h_op,
- struct super_block *h_sb __maybe_unused);
- };
- static const struct op a[] = {
- [AuDy_AOP] = {
- .sz = sizeof(struct au_dyaop),
- .set = dy_aop
- }
- };
- const struct op *p;
-
- sphl = dynop + op->dy_type;
- key = dy_gfind_get(sphl, op->dy_hop);
- if (key)
- goto out_add; /* success */
-
- p = a + op->dy_type;
- key = kzalloc(p->sz, GFP_NOFS);
- if (unlikely(!key)) {
- key = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- key->dk_op.dy_hop = op->dy_hop;
- kref_init(&key->dk_kref);
- p->set(key, op->dy_hop, au_br_sb(br));
- old = dy_gadd(sphl, key);
- if (old) {
- au_delayed_kfree(key);
- key = old;
- }
-
-out_add:
- old = dy_bradd(br, key);
- if (old)
- /* its ref-count should never be zero here */
- kref_put(&key->dk_kref, dy_bug);
-out:
- return key;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * Aufs prohibits O_DIRECT by defaut even if the branch supports it.
- * This behaviour is necessary to return an error from open(O_DIRECT) instead
- * of the succeeding I/O. The dio mount option enables O_DIRECT and makes
- * open(O_DIRECT) always succeed, but the succeeding I/O may return an error.
- * See the aufs manual in detail.
- */
-static void dy_adx(struct au_dyaop *dyaop, int do_dx)
-{
- if (!do_dx)
- dyaop->da_op.direct_IO = NULL;
- else
- dyaop->da_op.direct_IO = aufs_aop.direct_IO;
-}
-
-static struct au_dyaop *dy_aget(struct au_branch *br,
- const struct address_space_operations *h_aop,
- int do_dx)
-{
- struct au_dyaop *dyaop;
- struct au_dynop op;
-
- op.dy_type = AuDy_AOP;
- op.dy_haop = h_aop;
- dyaop = (void *)dy_get(&op, br);
- if (IS_ERR(dyaop))
- goto out;
- dy_adx(dyaop, do_dx);
-
-out:
- return dyaop;
-}
-
-int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode)
-{
- int err, do_dx;
- struct super_block *sb;
- struct au_branch *br;
- struct au_dyaop *dyaop;
-
- AuDebugOn(!S_ISREG(h_inode->i_mode));
- IiMustWriteLock(inode);
-
- sb = inode->i_sb;
- br = au_sbr(sb, bindex);
- do_dx = !!au_opt_test(au_mntflags(sb), DIO);
- dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx);
- err = PTR_ERR(dyaop);
- if (IS_ERR(dyaop))
- /* unnecessary to call dy_fput() */
- goto out;
-
- err = 0;
- inode->i_mapping->a_ops = &dyaop->da_op;
-
-out:
- return err;
-}
-
-/*
- * Is it safe to replace a_ops during the inode/file is in operation?
- * Yes, I hope so.
- */
-int au_dy_irefresh(struct inode *inode)
-{
- int err;
- aufs_bindex_t btop;
- struct inode *h_inode;
-
- err = 0;
- if (S_ISREG(inode->i_mode)) {
- btop = au_ibtop(inode);
- h_inode = au_h_iptr(inode, btop);
- err = au_dy_iaop(inode, btop, h_inode);
- }
- return err;
-}
-
-void au_dy_arefresh(int do_dx)
-{
- struct au_sphlhead *sphl;
- struct hlist_head *head;
- struct au_dykey *key;
-
- sphl = dynop + AuDy_AOP;
- head = &sphl->head;
- spin_lock(&sphl->spin);
- hlist_for_each_entry(key, head, dk_hnode)
- dy_adx((void *)key, do_dx);
- spin_unlock(&sphl->spin);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void __init au_dy_init(void)
-{
- int i;
-
- /* make sure that 'struct au_dykey *' can be any type */
- BUILD_BUG_ON(offsetof(struct au_dyaop, da_key));
-
- for (i = 0; i < AuDyLast; i++)
- au_sphl_init(dynop + i);
-}
-
-void au_dy_fin(void)
-{
- int i;
-
- for (i = 0; i < AuDyLast; i++)
- WARN_ON(!hlist_empty(&dynop[i].head));
-}
+++ /dev/null
-/*
- * Copyright (C) 2010-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * dynamically customizable operations (for regular files only)
- */
-
-#ifndef __AUFS_DYNOP_H__
-#define __AUFS_DYNOP_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/kref.h>
-
-enum {AuDy_AOP, AuDyLast};
-
-struct au_dynop {
- int dy_type;
- union {
- const void *dy_hop;
- const struct address_space_operations *dy_haop;
- };
-};
-
-struct au_dykey {
- union {
- struct hlist_node dk_hnode;
- struct rcu_head dk_rcu;
- };
- struct au_dynop dk_op;
-
- /*
- * during I am in the branch local array, kref is gotten. when the
- * branch is removed, kref is put.
- */
- struct kref dk_kref;
-};
-
-/* stop unioning since their sizes are very different from each other */
-struct au_dyaop {
- struct au_dykey da_key;
- struct address_space_operations da_op; /* not const */
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* dynop.c */
-struct au_branch;
-void au_dy_put(struct au_dykey *key);
-int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode);
-int au_dy_irefresh(struct inode *inode);
-void au_dy_arefresh(int do_dio);
-
-void __init au_dy_init(void);
-void au_dy_fin(void);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_DYNOP_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * export via nfs
- */
-
-#include <linux/exportfs.h>
-#include <linux/fs_struct.h>
-#include <linux/namei.h>
-#include <linux/nsproxy.h>
-#include <linux/random.h>
-#include <linux/writeback.h>
-#include "../fs/mount.h"
-#include "aufs.h"
-
-union conv {
-#ifdef CONFIG_AUFS_INO_T_64
- __u32 a[2];
-#else
- __u32 a[1];
-#endif
- ino_t ino;
-};
-
-static ino_t decode_ino(__u32 *a)
-{
- union conv u;
-
- BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
- u.a[0] = a[0];
-#ifdef CONFIG_AUFS_INO_T_64
- u.a[1] = a[1];
-#endif
- return u.ino;
-}
-
-static void encode_ino(__u32 *a, ino_t ino)
-{
- union conv u;
-
- u.ino = ino;
- a[0] = u.a[0];
-#ifdef CONFIG_AUFS_INO_T_64
- a[1] = u.a[1];
-#endif
-}
-
-/* NFS file handle */
-enum {
- Fh_br_id,
- Fh_sigen,
-#ifdef CONFIG_AUFS_INO_T_64
- /* support 64bit inode number */
- Fh_ino1,
- Fh_ino2,
- Fh_dir_ino1,
- Fh_dir_ino2,
-#else
- Fh_ino1,
- Fh_dir_ino1,
-#endif
- Fh_igen,
- Fh_h_type,
- Fh_tail,
-
- Fh_ino = Fh_ino1,
- Fh_dir_ino = Fh_dir_ino1
-};
-
-static int au_test_anon(struct dentry *dentry)
-{
- /* note: read d_flags without d_lock */
- return !!(dentry->d_flags & DCACHE_DISCONNECTED);
-}
-
-int au_test_nfsd(void)
-{
- int ret;
- struct task_struct *tsk = current;
- char comm[sizeof(tsk->comm)];
-
- ret = 0;
- if (tsk->flags & PF_KTHREAD) {
- get_task_comm(comm, tsk);
- ret = !strcmp(comm, "nfsd");
- }
-
- return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-/* inode generation external table */
-
-void au_xigen_inc(struct inode *inode)
-{
- loff_t pos;
- ssize_t sz;
- __u32 igen;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- sb = inode->i_sb;
- AuDebugOn(!au_opt_test(au_mntflags(sb), XINO));
-
- sbinfo = au_sbi(sb);
- pos = inode->i_ino;
- pos *= sizeof(igen);
- igen = inode->i_generation + 1;
- sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
- sizeof(igen), &pos);
- if (sz == sizeof(igen))
- return; /* success */
-
- if (unlikely(sz >= 0))
- AuIOErr("xigen error (%zd)\n", sz);
-}
-
-int au_xigen_new(struct inode *inode)
-{
- int err;
- loff_t pos;
- ssize_t sz;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- err = 0;
- /* todo: dirty, at mount time */
- if (inode->i_ino == AUFS_ROOT_INO)
- goto out;
- sb = inode->i_sb;
- SiMustAnyLock(sb);
- if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
- goto out;
-
- err = -EFBIG;
- pos = inode->i_ino;
- if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) {
- AuIOErr1("too large i%lld\n", pos);
- goto out;
- }
- pos *= sizeof(inode->i_generation);
-
- err = 0;
- sbinfo = au_sbi(sb);
- file = sbinfo->si_xigen;
- BUG_ON(!file);
-
- if (vfsub_f_size_read(file)
- < pos + sizeof(inode->i_generation)) {
- inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
- sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
- sizeof(inode->i_generation), &pos);
- } else
- sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
- sizeof(inode->i_generation), &pos);
- if (sz == sizeof(inode->i_generation))
- goto out; /* success */
-
- err = sz;
- if (unlikely(sz >= 0)) {
- err = -EIO;
- AuIOErr("xigen error (%zd)\n", sz);
- }
-
-out:
- return err;
-}
-
-int au_xigen_set(struct super_block *sb, struct file *base)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- file = au_xino_create2(base, sbinfo->si_xigen);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- err = 0;
- if (sbinfo->si_xigen)
- fput(sbinfo->si_xigen);
- sbinfo->si_xigen = file;
-
-out:
- return err;
-}
-
-void au_xigen_clr(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- if (sbinfo->si_xigen) {
- fput(sbinfo->si_xigen);
- sbinfo->si_xigen = NULL;
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
- ino_t dir_ino)
-{
- struct dentry *dentry, *d;
- struct inode *inode;
- unsigned int sigen;
-
- dentry = NULL;
- inode = ilookup(sb, ino);
- if (!inode)
- goto out;
-
- dentry = ERR_PTR(-ESTALE);
- sigen = au_sigen(sb);
- if (unlikely(au_is_bad_inode(inode)
- || IS_DEADDIR(inode)
- || sigen != au_iigen(inode, NULL)))
- goto out_iput;
-
- dentry = NULL;
- if (!dir_ino || S_ISDIR(inode->i_mode))
- dentry = d_find_alias(inode);
- else {
- spin_lock(&inode->i_lock);
- hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) {
- spin_lock(&d->d_lock);
- if (!au_test_anon(d)
- && d_inode(d->d_parent)->i_ino == dir_ino) {
- dentry = dget_dlock(d);
- spin_unlock(&d->d_lock);
- break;
- }
- spin_unlock(&d->d_lock);
- }
- spin_unlock(&inode->i_lock);
- }
- if (unlikely(dentry && au_digen_test(dentry, sigen))) {
- /* need to refresh */
- dput(dentry);
- dentry = NULL;
- }
-
-out_iput:
- iput(inode);
-out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: dirty? */
-/* if exportfs_decode_fh() passed vfsmount*, we could be happy */
-
-struct au_compare_mnt_args {
- /* input */
- struct super_block *sb;
-
- /* output */
- struct vfsmount *mnt;
-};
-
-static int au_compare_mnt(struct vfsmount *mnt, void *arg)
-{
- struct au_compare_mnt_args *a = arg;
-
- if (mnt->mnt_sb != a->sb)
- return 0;
- a->mnt = mntget(mnt);
- return 1;
-}
-
-static struct vfsmount *au_mnt_get(struct super_block *sb)
-{
- int err;
- struct path root;
- struct au_compare_mnt_args args = {
- .sb = sb
- };
-
- get_fs_root(current->fs, &root);
- rcu_read_lock();
- err = iterate_mounts(au_compare_mnt, &args, root.mnt);
- rcu_read_unlock();
- path_put(&root);
- AuDebugOn(!err);
- AuDebugOn(!args.mnt);
- return args.mnt;
-}
-
-struct au_nfsd_si_lock {
- unsigned int sigen;
- aufs_bindex_t bindex, br_id;
- unsigned char force_lock;
-};
-
-static int si_nfsd_read_lock(struct super_block *sb,
- struct au_nfsd_si_lock *nsi_lock)
-{
- int err;
- aufs_bindex_t bindex;
-
- si_read_lock(sb, AuLock_FLUSH);
-
- /* branch id may be wrapped around */
- err = 0;
- bindex = au_br_index(sb, nsi_lock->br_id);
- if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb))
- goto out; /* success */
-
- err = -ESTALE;
- bindex = -1;
- if (!nsi_lock->force_lock)
- si_read_unlock(sb);
-
-out:
- nsi_lock->bindex = bindex;
- return err;
-}
-
-struct find_name_by_ino {
- struct dir_context ctx;
- int called, found;
- ino_t ino;
- char *name;
- int namelen;
-};
-
-static int
-find_name_by_ino(struct dir_context *ctx, const char *name, int namelen,
- loff_t offset, u64 ino, unsigned int d_type)
-{
- struct find_name_by_ino *a = container_of(ctx, struct find_name_by_ino,
- ctx);
-
- a->called++;
- if (a->ino != ino)
- return 0;
-
- memcpy(a->name, name, namelen);
- a->namelen = namelen;
- a->found = 1;
- return 1;
-}
-
-static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino,
- struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry, *parent;
- struct file *file;
- struct inode *dir;
- struct find_name_by_ino arg = {
- .ctx = {
- .actor = find_name_by_ino
- }
- };
- int err;
-
- parent = path->dentry;
- if (nsi_lock)
- si_read_unlock(parent->d_sb);
- file = vfsub_dentry_open(path, au_dir_roflags);
- dentry = (void *)file;
- if (IS_ERR(file))
- goto out;
-
- dentry = ERR_PTR(-ENOMEM);
- arg.name = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!arg.name))
- goto out_file;
- arg.ino = ino;
- arg.found = 0;
- do {
- arg.called = 0;
- /* smp_mb(); */
- err = vfsub_iterate_dir(file, &arg.ctx);
- } while (!err && !arg.found && arg.called);
- dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_name;
- /* instead of ENOENT */
- dentry = ERR_PTR(-ESTALE);
- if (!arg.found)
- goto out_name;
-
- /* do not call vfsub_lkup_one() */
- dir = d_inode(parent);
- dentry = vfsub_lookup_one_len_unlocked(arg.name, parent, arg.namelen);
- AuTraceErrPtr(dentry);
- if (IS_ERR(dentry))
- goto out_name;
- AuDebugOn(au_test_anon(dentry));
- if (unlikely(d_really_is_negative(dentry))) {
- dput(dentry);
- dentry = ERR_PTR(-ENOENT);
- }
-
-out_name:
- au_delayed_free_page((unsigned long)arg.name);
-out_file:
- fput(file);
-out:
- if (unlikely(nsi_lock
- && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0))
- if (!IS_ERR(dentry)) {
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- }
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
- ino_t dir_ino,
- struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry;
- struct path path;
-
- if (dir_ino != AUFS_ROOT_INO) {
- path.dentry = decode_by_ino(sb, dir_ino, 0);
- dentry = path.dentry;
- if (!path.dentry || IS_ERR(path.dentry))
- goto out;
- AuDebugOn(au_test_anon(path.dentry));
- } else
- path.dentry = dget(sb->s_root);
-
- path.mnt = au_mnt_get(sb);
- dentry = au_lkup_by_ino(&path, ino, nsi_lock);
- path_put(&path);
-
-out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int h_acceptable(void *expv, struct dentry *dentry)
-{
- return 1;
-}
-
-static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath,
- char *buf, int len, struct super_block *sb)
-{
- char *p;
- int n;
- struct path path;
-
- p = d_path(h_rootpath, buf, len);
- if (IS_ERR(p))
- goto out;
- n = strlen(p);
-
- path.mnt = h_rootpath->mnt;
- path.dentry = h_parent;
- p = d_path(&path, buf, len);
- if (IS_ERR(p))
- goto out;
- if (n != 1)
- p += n;
-
- path.mnt = au_mnt_get(sb);
- path.dentry = sb->s_root;
- p = d_path(&path, buf, len - strlen(p));
- mntput(path.mnt);
- if (IS_ERR(p))
- goto out;
- if (n != 1)
- p[strlen(p)] = '/';
-
-out:
- AuTraceErrPtr(p);
- return p;
-}
-
-static
-struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh,
- int fh_len, struct au_nfsd_si_lock *nsi_lock)
-{
- struct dentry *dentry, *h_parent, *root;
- struct super_block *h_sb;
- char *pathname, *p;
- struct vfsmount *h_mnt;
- struct au_branch *br;
- int err;
- struct path path;
-
- br = au_sbr(sb, nsi_lock->bindex);
- h_mnt = au_br_mnt(br);
- h_sb = h_mnt->mnt_sb;
- /* todo: call lower fh_to_dentry()? fh_to_parent()? */
- lockdep_off();
- h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
- fh_len - Fh_tail, fh[Fh_h_type],
- h_acceptable, /*context*/NULL);
- lockdep_on();
- dentry = h_parent;
- if (unlikely(!h_parent || IS_ERR(h_parent))) {
- AuWarn1("%s decode_fh failed, %ld\n",
- au_sbtype(h_sb), PTR_ERR(h_parent));
- goto out;
- }
- dentry = NULL;
- if (unlikely(au_test_anon(h_parent))) {
- AuWarn1("%s decode_fh returned a disconnected dentry\n",
- au_sbtype(h_sb));
- goto out_h_parent;
- }
-
- dentry = ERR_PTR(-ENOMEM);
- pathname = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!pathname))
- goto out_h_parent;
-
- root = sb->s_root;
- path.mnt = h_mnt;
- di_read_lock_parent(root, !AuLock_IR);
- path.dentry = au_h_dptr(root, nsi_lock->bindex);
- di_read_unlock(root, !AuLock_IR);
- p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb);
- dentry = (void *)p;
- if (IS_ERR(p))
- goto out_pathname;
-
- si_read_unlock(sb);
- err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
- dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_relock;
-
- dentry = ERR_PTR(-ENOENT);
- AuDebugOn(au_test_anon(path.dentry));
- if (unlikely(d_really_is_negative(path.dentry)))
- goto out_path;
-
- if (ino != d_inode(path.dentry)->i_ino)
- dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL);
- else
- dentry = dget(path.dentry);
-
-out_path:
- path_put(&path);
-out_relock:
- if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
- if (!IS_ERR(dentry)) {
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
- }
-out_pathname:
- au_delayed_free_page((unsigned long)pathname);
-out_h_parent:
- dput(h_parent);
-out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *
-aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
- int fh_type)
-{
- struct dentry *dentry;
- __u32 *fh = fid->raw;
- struct au_branch *br;
- ino_t ino, dir_ino;
- struct au_nfsd_si_lock nsi_lock = {
- .force_lock = 0
- };
-
- dentry = ERR_PTR(-ESTALE);
- /* it should never happen, but the file handle is unreliable */
- if (unlikely(fh_len < Fh_tail))
- goto out;
- nsi_lock.sigen = fh[Fh_sigen];
- nsi_lock.br_id = fh[Fh_br_id];
-
- /* branch id may be wrapped around */
- br = NULL;
- if (unlikely(si_nfsd_read_lock(sb, &nsi_lock)))
- goto out;
- nsi_lock.force_lock = 1;
-
- /* is this inode still cached? */
- ino = decode_ino(fh + Fh_ino);
- /* it should never happen */
- if (unlikely(ino == AUFS_ROOT_INO))
- goto out_unlock;
-
- dir_ino = decode_ino(fh + Fh_dir_ino);
- dentry = decode_by_ino(sb, ino, dir_ino);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (dentry)
- goto accept;
-
- /* is the parent dir cached? */
- br = au_sbr(sb, nsi_lock.bindex);
- au_br_get(br);
- dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (dentry)
- goto accept;
-
- /* lookup path */
- dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock);
- if (IS_ERR(dentry))
- goto out_unlock;
- if (unlikely(!dentry))
- /* todo?: make it ESTALE */
- goto out_unlock;
-
-accept:
- if (!au_digen_test(dentry, au_sigen(sb))
- && d_inode(dentry)->i_generation == fh[Fh_igen])
- goto out_unlock; /* success */
-
- dput(dentry);
- dentry = ERR_PTR(-ESTALE);
-out_unlock:
- if (br)
- au_br_put(br);
- si_read_unlock(sb);
-out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-#if 0 /* reserved for future use */
-/* support subtreecheck option */
-static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
- int fh_len, int fh_type)
-{
- struct dentry *parent;
- __u32 *fh = fid->raw;
- ino_t dir_ino;
-
- dir_ino = decode_ino(fh + Fh_dir_ino);
- parent = decode_by_ino(sb, dir_ino, 0);
- if (IS_ERR(parent))
- goto out;
- if (!parent)
- parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
- dir_ino, fh, fh_len);
-
-out:
- AuTraceErrPtr(parent);
- return parent;
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_encode_fh(struct inode *inode, __u32 *fh, int *max_len,
- struct inode *dir)
-{
- int err;
- aufs_bindex_t bindex;
- struct super_block *sb, *h_sb;
- struct dentry *dentry, *parent, *h_parent;
- struct inode *h_dir;
- struct au_branch *br;
-
- err = -ENOSPC;
- if (unlikely(*max_len <= Fh_tail)) {
- AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
- goto out;
- }
-
- err = FILEID_ROOT;
- if (inode->i_ino == AUFS_ROOT_INO) {
- AuDebugOn(inode->i_ino != AUFS_ROOT_INO);
- goto out;
- }
-
- h_parent = NULL;
- sb = inode->i_sb;
- err = si_read_lock(sb, AuLock_FLUSH);
- if (unlikely(err))
- goto out;
-
-#ifdef CONFIG_AUFS_DEBUG
- if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
- AuWarn1("NFS-exporting requires xino\n");
-#endif
- err = -EIO;
- parent = NULL;
- ii_read_lock_child(inode);
- bindex = au_ibtop(inode);
- if (!dir) {
- dentry = d_find_any_alias(inode);
- if (unlikely(!dentry))
- goto out_unlock;
- AuDebugOn(au_test_anon(dentry));
- parent = dget_parent(dentry);
- dput(dentry);
- if (unlikely(!parent))
- goto out_unlock;
- if (d_really_is_positive(parent))
- dir = d_inode(parent);
- }
-
- ii_read_lock_parent(dir);
- h_dir = au_h_iptr(dir, bindex);
- ii_read_unlock(dir);
- if (unlikely(!h_dir))
- goto out_parent;
- h_parent = d_find_any_alias(h_dir);
- if (unlikely(!h_parent))
- goto out_hparent;
-
- err = -EPERM;
- br = au_sbr(sb, bindex);
- h_sb = au_br_sb(br);
- if (unlikely(!h_sb->s_export_op)) {
- AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
- goto out_hparent;
- }
-
- fh[Fh_br_id] = br->br_id;
- fh[Fh_sigen] = au_sigen(sb);
- encode_ino(fh + Fh_ino, inode->i_ino);
- encode_ino(fh + Fh_dir_ino, dir->i_ino);
- fh[Fh_igen] = inode->i_generation;
-
- *max_len -= Fh_tail;
- fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail),
- max_len,
- /*connectable or subtreecheck*/0);
- err = fh[Fh_h_type];
- *max_len += Fh_tail;
- /* todo: macros? */
- if (err != FILEID_INVALID)
- err = 99;
- else
- AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));
-
-out_hparent:
- dput(h_parent);
-out_parent:
- dput(parent);
-out_unlock:
- ii_read_unlock(inode);
- si_read_unlock(sb);
-out:
- if (unlikely(err < 0))
- err = FILEID_INVALID;
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_commit_metadata(struct inode *inode)
-{
- int err;
- aufs_bindex_t bindex;
- struct super_block *sb;
- struct inode *h_inode;
- int (*f)(struct inode *inode);
-
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
- ii_write_lock_child(inode);
- bindex = au_ibtop(inode);
- AuDebugOn(bindex < 0);
- h_inode = au_h_iptr(inode, bindex);
-
- f = h_inode->i_sb->s_export_op->commit_metadata;
- if (f)
- err = f(h_inode);
- else {
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_ALL,
- .nr_to_write = 0 /* metadata only */
- };
-
- err = sync_inode(h_inode, &wbc);
- }
-
- au_cpup_attr_timesizes(inode);
- ii_write_unlock(inode);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct export_operations aufs_export_op = {
- .fh_to_dentry = aufs_fh_to_dentry,
- /* .fh_to_parent = aufs_fh_to_parent, */
- .encode_fh = aufs_encode_fh,
- .commit_metadata = aufs_commit_metadata
-};
-
-void au_export_init(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- __u32 u;
-
- BUILD_BUG_ON_MSG(IS_BUILTIN(CONFIG_AUFS_FS)
- && IS_MODULE(CONFIG_EXPORTFS),
- AUFS_NAME ": unsupported configuration "
- "CONFIG_EXPORTFS=m and CONFIG_AUFS_FS=y");
-
- sb->s_export_op = &aufs_export_op;
- sbinfo = au_sbi(sb);
- sbinfo->si_xigen = NULL;
- get_random_bytes(&u, sizeof(u));
- BUILD_BUG_ON(sizeof(u) != sizeof(int));
- atomic_set(&sbinfo->si_xigen_next, u);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * file and vm operations
- */
-
-#include <linux/aio.h>
-#include <linux/fs_stack.h>
-#include <linux/mman.h>
-#include <linux/security.h>
-#include "aufs.h"
-
-int au_do_open_nondir(struct file *file, int flags, struct file *h_file)
-{
- int err;
- aufs_bindex_t bindex;
- struct dentry *dentry, *h_dentry;
- struct au_finfo *finfo;
- struct inode *h_inode;
-
- FiMustWriteLock(file);
-
- err = 0;
- dentry = file->f_path.dentry;
- AuDebugOn(IS_ERR_OR_NULL(dentry));
- finfo = au_fi(file);
- memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop));
- atomic_set(&finfo->fi_mmapped, 0);
- bindex = au_dbtop(dentry);
- if (!h_file) {
- h_dentry = au_h_dptr(dentry, bindex);
- err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb);
- if (unlikely(err))
- goto out;
- h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
- } else {
- h_dentry = h_file->f_path.dentry;
- err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb);
- if (unlikely(err))
- goto out;
- get_file(h_file);
- }
- if (IS_ERR(h_file))
- err = PTR_ERR(h_file);
- else {
- if ((flags & __O_TMPFILE)
- && !(flags & O_EXCL)) {
- h_inode = file_inode(h_file);
- spin_lock(&h_inode->i_lock);
- h_inode->i_state |= I_LINKABLE;
- spin_unlock(&h_inode->i_lock);
- }
- au_set_fbtop(file, bindex);
- au_set_h_fptr(file, bindex, h_file);
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- }
-
-out:
- return err;
-}
-
-static int aufs_open_nondir(struct inode *inode __maybe_unused,
- struct file *file)
-{
- int err;
- struct super_block *sb;
- struct au_do_open_args args = {
- .open = au_do_open_nondir
- };
-
- AuDbg("%pD, f_flags 0x%x, f_mode 0x%x\n",
- file, vfsub_file_flags(file), file->f_mode);
-
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- err = au_do_open(file, &args);
- si_read_unlock(sb);
- return err;
-}
-
-int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file)
-{
- struct au_finfo *finfo;
- aufs_bindex_t bindex;
- int delayed;
-
- finfo = au_fi(file);
- au_sphl_del(&finfo->fi_hlist,
- &au_sbi(file->f_path.dentry->d_sb)->si_files);
- bindex = finfo->fi_btop;
- if (bindex >= 0)
- au_set_h_fptr(file, bindex, NULL);
-
- delayed = (current->flags & PF_KTHREAD) || in_interrupt();
- au_finfo_fin(file, delayed);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_do_flush_nondir(struct file *file, fl_owner_t id)
-{
- int err;
- struct file *h_file;
-
- err = 0;
- h_file = au_hf_top(file);
- if (h_file)
- err = vfsub_flush(h_file, id);
- return err;
-}
-
-static int aufs_flush_nondir(struct file *file, fl_owner_t id)
-{
- return au_do_flush(file, id, au_do_flush_nondir);
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * read and write functions acquire [fdi]_rwsem once, but release before
- * mmap_sem. This is because to stop a race condition between mmap(2).
- * Releasing these aufs-rwsem should be safe, no branch-mamagement (by keeping
- * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in
- * read functions after [fdi]_rwsem are released, but it should be harmless.
- */
-
-/* Callers should call au_read_post() or fput() in the end */
-struct file *au_read_pre(struct file *file, int keep_fi)
-{
- struct file *h_file;
- int err;
-
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
- if (!err) {
- di_read_unlock(file->f_path.dentry, AuLock_IR);
- h_file = au_hf_top(file);
- get_file(h_file);
- if (!keep_fi)
- fi_read_unlock(file);
- } else
- h_file = ERR_PTR(err);
-
- return h_file;
-}
-
-static void au_read_post(struct inode *inode, struct file *h_file)
-{
- /* update without lock, I don't think it a problem */
- fsstack_copy_attr_atime(inode, file_inode(h_file));
- fput(h_file);
-}
-
-struct au_write_pre {
- blkcnt_t blks;
- aufs_bindex_t btop;
-};
-
-/*
- * return with iinfo is write-locked
- * callers should call au_write_post() or iinfo_write_unlock() + fput() in the
- * end
- */
-static struct file *au_write_pre(struct file *file, int do_ready,
- struct au_write_pre *wpre)
-{
- struct file *h_file;
- struct dentry *dentry;
- int err;
- struct au_pin pin;
-
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- h_file = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- dentry = file->f_path.dentry;
- if (do_ready) {
- err = au_ready_to_write(file, -1, &pin);
- if (unlikely(err)) {
- h_file = ERR_PTR(err);
- di_write_unlock(dentry);
- goto out_fi;
- }
- }
-
- di_downgrade_lock(dentry, /*flags*/0);
- if (wpre)
- wpre->btop = au_fbtop(file);
- h_file = au_hf_top(file);
- get_file(h_file);
- if (wpre)
- wpre->blks = file_inode(h_file)->i_blocks;
- if (do_ready)
- au_unpin(&pin);
- di_read_unlock(dentry, /*flags*/0);
-
-out_fi:
- fi_write_unlock(file);
-out:
- return h_file;
-}
-
-static void au_write_post(struct inode *inode, struct file *h_file,
- struct au_write_pre *wpre, ssize_t written)
-{
- struct inode *h_inode;
-
- au_cpup_attr_timesizes(inode);
- AuDebugOn(au_ibtop(inode) != wpre->btop);
- h_inode = file_inode(h_file);
- inode->i_mode = h_inode->i_mode;
- ii_write_unlock(inode);
- fput(h_file);
-
- /* AuDbg("blks %llu, %llu\n", (u64)blks, (u64)h_inode->i_blocks); */
- if (written > 0)
- au_fhsm_wrote(inode->i_sb, wpre->btop,
- /*force*/h_inode->i_blocks > wpre->blks);
-}
-
-static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
- struct inode *inode;
- struct file *h_file;
- struct super_block *sb;
-
- inode = file_inode(file);
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- /* filedata may be obsoleted by concurrent copyup, but no problem */
- err = vfsub_read_u(h_file, buf, count, ppos);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- au_read_post(inode, h_file);
-
-out:
- si_read_unlock(sb);
- return err;
-}
-
-/*
- * todo: very ugly
- * it locks both of i_mutex and si_rwsem for read in safe.
- * if the plink maintenance mode continues forever (that is the problem),
- * may loop forever.
- */
-static void au_mtx_and_read_lock(struct inode *inode)
-{
- int err;
- struct super_block *sb = inode->i_sb;
-
- while (1) {
- inode_lock(inode);
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (!err)
- break;
- inode_unlock(inode);
- si_read_lock(sb, AuLock_NOPLMW);
- si_read_unlock(sb);
- }
-}
-
-static ssize_t aufs_write(struct file *file, const char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- ssize_t err;
- struct au_write_pre wpre;
- struct inode *inode;
- struct file *h_file;
- char __user *buf = (char __user *)ubuf;
-
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = vfsub_write_u(h_file, buf, count, ppos);
- au_write_post(inode, h_file, &wpre, err);
-
-out:
- si_read_unlock(inode->i_sb);
- inode_unlock(inode);
- return err;
-}
-
-static ssize_t au_do_iter(struct file *h_file, int rw, struct kiocb *kio,
- struct iov_iter *iov_iter)
-{
- ssize_t err;
- struct file *file;
- ssize_t (*iter)(struct kiocb *, struct iov_iter *);
-
- err = security_file_permission(h_file, rw);
- if (unlikely(err))
- goto out;
-
- err = -ENOSYS;
- iter = NULL;
- if (rw == MAY_READ)
- iter = h_file->f_op->read_iter;
- else if (rw == MAY_WRITE)
- iter = h_file->f_op->write_iter;
-
- file = kio->ki_filp;
- kio->ki_filp = h_file;
- if (iter) {
- lockdep_off();
- err = iter(kio, iov_iter);
- lockdep_on();
- } else
- /* currently there is no such fs */
- WARN_ON_ONCE(1);
- kio->ki_filp = file;
-
-out:
- return err;
-}
-
-static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter)
-{
- ssize_t err;
- struct file *file, *h_file;
- struct inode *inode;
- struct super_block *sb;
-
- file = kio->ki_filp;
- inode = file_inode(file);
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/1);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- if (au_test_loopback_kthread()) {
- au_warn_loopback(h_file->f_path.dentry->d_sb);
- if (file->f_mapping != h_file->f_mapping) {
- file->f_mapping = h_file->f_mapping;
- smp_mb(); /* unnecessary? */
- }
- }
- fi_read_unlock(file);
-
- err = au_do_iter(h_file, MAY_READ, kio, iov_iter);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
- au_read_post(inode, h_file);
-
-out:
- si_read_unlock(sb);
- return err;
-}
-
-static ssize_t aufs_write_iter(struct kiocb *kio, struct iov_iter *iov_iter)
-{
- ssize_t err;
- struct au_write_pre wpre;
- struct inode *inode;
- struct file *file, *h_file;
-
- file = kio->ki_filp;
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = au_do_iter(h_file, MAY_WRITE, kio, iov_iter);
- au_write_post(inode, h_file, &wpre, err);
-
-out:
- si_read_unlock(inode->i_sb);
- inode_unlock(inode);
- return err;
-}
-
-static ssize_t aufs_splice_read(struct file *file, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
-{
- ssize_t err;
- struct file *h_file;
- struct inode *inode;
- struct super_block *sb;
-
- inode = file_inode(file);
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = vfsub_splice_to(h_file, ppos, pipe, len, flags);
- /* todo: necessasry? */
- /* file->f_ra = h_file->f_ra; */
- au_read_post(inode, h_file);
-
-out:
- si_read_unlock(sb);
- return err;
-}
-
-static ssize_t
-aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos,
- size_t len, unsigned int flags)
-{
- ssize_t err;
- struct au_write_pre wpre;
- struct inode *inode;
- struct file *h_file;
-
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = vfsub_splice_from(pipe, h_file, ppos, len, flags);
- au_write_post(inode, h_file, &wpre, err);
-
-out:
- si_read_unlock(inode->i_sb);
- inode_unlock(inode);
- return err;
-}
-
-static long aufs_fallocate(struct file *file, int mode, loff_t offset,
- loff_t len)
-{
- long err;
- struct au_write_pre wpre;
- struct inode *inode;
- struct file *h_file;
-
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- lockdep_off();
- err = vfs_fallocate(h_file, mode, offset, len);
- lockdep_on();
- au_write_post(inode, h_file, &wpre, /*written*/1);
-
-out:
- si_read_unlock(inode->i_sb);
- inode_unlock(inode);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * The locking order around current->mmap_sem.
- * - in most and regular cases
- * file I/O syscall -- aufs_read() or something
- * -- si_rwsem for read -- mmap_sem
- * (Note that [fdi]i_rwsem are released before mmap_sem).
- * - in mmap case
- * mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem
- * This AB-BA order is definitly bad, but is not a problem since "si_rwsem for
- * read" allows muliple processes to acquire it and [fdi]i_rwsem are not held in
- * file I/O. Aufs needs to stop lockdep in aufs_mmap() though.
- * It means that when aufs acquires si_rwsem for write, the process should never
- * acquire mmap_sem.
- *
- * Actually aufs_iterate() holds [fdi]i_rwsem before mmap_sem, but this is not a
- * problem either since any directory is not able to be mmap-ed.
- * The similar scenario is applied to aufs_readlink() too.
- */
-
-#if 0 /* stop calling security_file_mmap() */
-/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */
-#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b)
-
-static unsigned long au_arch_prot_conv(unsigned long flags)
-{
- /* currently ppc64 only */
-#ifdef CONFIG_PPC64
- /* cf. linux/arch/powerpc/include/asm/mman.h */
- AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO);
- return AuConv_VM_PROT(flags, SAO);
-#else
- AuDebugOn(arch_calc_vm_prot_bits(-1));
- return 0;
-#endif
-}
-
-static unsigned long au_prot_conv(unsigned long flags)
-{
- return AuConv_VM_PROT(flags, READ)
- | AuConv_VM_PROT(flags, WRITE)
- | AuConv_VM_PROT(flags, EXEC)
- | au_arch_prot_conv(flags);
-}
-
-/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */
-#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b)
-
-static unsigned long au_flag_conv(unsigned long flags)
-{
- return AuConv_VM_MAP(flags, GROWSDOWN)
- | AuConv_VM_MAP(flags, DENYWRITE)
- | AuConv_VM_MAP(flags, LOCKED);
-}
-#endif
-
-static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
-{
- int err;
- const unsigned char wlock
- = (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED);
- struct super_block *sb;
- struct file *h_file;
- struct inode *inode;
-
- AuDbgVmRegion(file, vma);
-
- inode = file_inode(file);
- sb = inode->i_sb;
- lockdep_off();
- si_read_lock(sb, AuLock_NOPLMW);
-
- h_file = au_write_pre(file, wlock, /*wpre*/NULL);
- lockdep_on();
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- err = 0;
- au_set_mmapped(file);
- au_vm_file_reset(vma, h_file);
- /*
- * we cannot call security_mmap_file() here since it may acquire
- * mmap_sem or i_mutex.
- *
- * err = security_mmap_file(h_file, au_prot_conv(vma->vm_flags),
- * au_flag_conv(vma->vm_flags));
- */
- if (!err)
- err = h_file->f_op->mmap(h_file, vma);
- if (!err) {
- au_vm_prfile_set(vma, file);
- fsstack_copy_attr_atime(inode, file_inode(h_file));
- goto out_fput; /* success */
- }
- au_unset_mmapped(file);
- au_vm_file_reset(vma, file);
-
-out_fput:
- lockdep_off();
- ii_write_unlock(inode);
- lockdep_on();
- fput(h_file);
-out:
- lockdep_off();
- si_read_unlock(sb);
- lockdep_on();
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end,
- int datasync)
-{
- int err;
- struct au_write_pre wpre;
- struct inode *inode;
- struct file *h_file;
-
- err = 0; /* -EBADF; */ /* posix? */
- if (unlikely(!(file->f_mode & FMODE_WRITE)))
- goto out;
-
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out_unlock;
-
- err = vfsub_fsync(h_file, &h_file->f_path, datasync);
- au_write_post(inode, h_file, &wpre, /*written*/0);
-
-out_unlock:
- si_read_unlock(inode->i_sb);
- inode_unlock(inode);
-out:
- return err;
-}
-
-/* no one supports this operation, currently */
-#if 0
-static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync)
-{
- int err;
- struct au_write_pre wpre;
- struct inode *inode, *h_inode;
- struct file *file, *h_file;
-
- err = 0; /* -EBADF; */ /* posix? */
- if (unlikely(!(file->f_mode & FMODE_WRITE)))
- goto out;
-
- file = kio->ki_filp;
- inode = file_inode(file);
- au_mtx_and_read_lock(inode);
-
- h_file = au_write_pre(file, /*do_ready*/1, &wpre);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out_unlock;
-
- err = -ENOSYS;
- h_file = au_hf_top(file);
- if (h_file->f_op->aio_fsync) {
- h_inode = file_inode(h_file);
- if (!is_sync_kiocb(kio)) {
- get_file(h_file);
- fput(file);
- }
- kio->ki_filp = h_file;
- err = h_file->f_op->aio_fsync(kio, datasync);
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- if (!err)
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
- /*ignore*/
- inode_unlock(h_inode);
- }
- au_write_post(inode, h_file, &wpre, /*written*/0);
-
-out_unlock:
- si_read_unlock(inode->sb);
- inode_unlock(inode);
-out:
- return err;
-}
-#endif
-
-static int aufs_fasync(int fd, struct file *file, int flag)
-{
- int err;
- struct file *h_file;
- struct super_block *sb;
-
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- if (h_file->f_op->fasync)
- err = h_file->f_op->fasync(fd, h_file, flag);
- fput(h_file); /* instead of au_read_post() */
-
-out:
- si_read_unlock(sb);
- return err;
-}
-
-static int aufs_setfl(struct file *file, unsigned long arg)
-{
- int err;
- struct file *h_file;
- struct super_block *sb;
-
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- arg |= vfsub_file_flags(file) & FASYNC; /* stop calling h_file->fasync */
- err = setfl(/*unused fd*/-1, h_file, arg);
- fput(h_file); /* instead of au_read_post() */
-
-out:
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* no one supports this operation, currently */
-#if 0
-static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset,
- size_t len, loff_t *pos, int more)
-{
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-const struct file_operations aufs_file_fop = {
- .owner = THIS_MODULE,
-
- .llseek = default_llseek,
-
- .read = aufs_read,
- .write = aufs_write,
- .read_iter = aufs_read_iter,
- .write_iter = aufs_write_iter,
-
-#ifdef CONFIG_AUFS_POLL
- .poll = aufs_poll,
-#endif
- .unlocked_ioctl = aufs_ioctl_nondir,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = aufs_compat_ioctl_nondir,
-#endif
- .mmap = aufs_mmap,
- .open = aufs_open_nondir,
- .flush = aufs_flush_nondir,
- .release = aufs_release_nondir,
- .fsync = aufs_fsync_nondir,
- /* .aio_fsync = aufs_aio_fsync_nondir, */
- .fasync = aufs_fasync,
- /* .sendpage = aufs_sendpage, */
- .setfl = aufs_setfl,
- .splice_write = aufs_splice_write,
- .splice_read = aufs_splice_read,
-#if 0
- .aio_splice_write = aufs_aio_splice_write,
- .aio_splice_read = aufs_aio_splice_read,
-#endif
- .fallocate = aufs_fallocate
-};
+++ /dev/null
-/*
- * Copyright (C) 2011-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/*
- * File-based Hierarchy Storage Management
- */
-
-#include <linux/anon_inodes.h>
-#include <linux/poll.h>
-#include <linux/seq_file.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-static aufs_bindex_t au_fhsm_bottom(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- AuDebugOn(!fhsm);
- return fhsm->fhsm_bottom;
-}
-
-void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- AuDebugOn(!fhsm);
- fhsm->fhsm_bottom = bindex;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_fhsm_test_jiffy(struct au_sbinfo *sbinfo, struct au_branch *br)
-{
- struct au_br_fhsm *bf;
-
- bf = br->br_fhsm;
- MtxMustLock(&bf->bf_lock);
-
- return !bf->bf_readable
- || time_after(jiffies,
- bf->bf_jiffy + sbinfo->si_fhsm.fhsm_expire);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_fhsm_notify(struct super_block *sb, int val)
-{
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- if (au_fhsm_pid(fhsm)
- && atomic_read(&fhsm->fhsm_readable) != -1) {
- atomic_set(&fhsm->fhsm_readable, val);
- if (val)
- wake_up(&fhsm->fhsm_wqh);
- }
-}
-
-static int au_fhsm_stfs(struct super_block *sb, aufs_bindex_t bindex,
- struct aufs_stfs *rstfs, int do_lock, int do_notify)
-{
- int err;
- struct au_branch *br;
- struct au_br_fhsm *bf;
-
- br = au_sbr(sb, bindex);
- AuDebugOn(au_br_rdonly(br));
- bf = br->br_fhsm;
- AuDebugOn(!bf);
-
- if (do_lock)
- mutex_lock(&bf->bf_lock);
- else
- MtxMustLock(&bf->bf_lock);
-
- /* sb->s_root for NFS is unreliable */
- err = au_br_stfs(br, &bf->bf_stfs);
- if (unlikely(err)) {
- AuErr1("FHSM failed (%d), b%d, ignored.\n", bindex, err);
- goto out;
- }
-
- bf->bf_jiffy = jiffies;
- bf->bf_readable = 1;
- if (do_notify)
- au_fhsm_notify(sb, /*val*/1);
- if (rstfs)
- *rstfs = bf->bf_stfs;
-
-out:
- if (do_lock)
- mutex_unlock(&bf->bf_lock);
- au_fhsm_notify(sb, /*val*/1);
-
- return err;
-}
-
-void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force)
-{
- int err;
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
- struct au_branch *br;
- struct au_br_fhsm *bf;
-
- AuDbg("b%d, force %d\n", bindex, force);
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- if (!au_ftest_si(sbinfo, FHSM)
- || fhsm->fhsm_bottom == bindex)
- return;
-
- br = au_sbr(sb, bindex);
- bf = br->br_fhsm;
- AuDebugOn(!bf);
- mutex_lock(&bf->bf_lock);
- if (force
- || au_fhsm_pid(fhsm)
- || au_fhsm_test_jiffy(sbinfo, br))
- err = au_fhsm_stfs(sb, bindex, /*rstfs*/NULL, /*do_lock*/0,
- /*do_notify*/1);
- mutex_unlock(&bf->bf_lock);
-}
-
-void au_fhsm_wrote_all(struct super_block *sb, int force)
-{
- aufs_bindex_t bindex, bbot;
- struct au_branch *br;
-
- /* exclude the bottom */
- bbot = au_fhsm_bottom(sb);
- for (bindex = 0; bindex < bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_fhsm(br->br_perm))
- au_fhsm_wrote(sb, bindex, force);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-static unsigned int au_fhsm_poll(struct file *file,
- struct poll_table_struct *wait)
-{
- unsigned int mask;
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- mask = 0;
- sbinfo = file->private_data;
- fhsm = &sbinfo->si_fhsm;
- poll_wait(file, &fhsm->fhsm_wqh, wait);
- if (atomic_read(&fhsm->fhsm_readable))
- mask = POLLIN /* | POLLRDNORM */;
-
- AuTraceErr((int)mask);
- return mask;
-}
-
-static int au_fhsm_do_read_one(struct aufs_stbr __user *stbr,
- struct aufs_stfs *stfs, __s16 brid)
-{
- int err;
-
- err = copy_to_user(&stbr->stfs, stfs, sizeof(*stfs));
- if (!err)
- err = __put_user(brid, &stbr->brid);
- if (unlikely(err))
- err = -EFAULT;
-
- return err;
-}
-
-static ssize_t au_fhsm_do_read(struct super_block *sb,
- struct aufs_stbr __user *stbr, size_t count)
-{
- ssize_t err;
- int nstbr;
- aufs_bindex_t bindex, bbot;
- struct au_branch *br;
- struct au_br_fhsm *bf;
-
- /* except the bottom branch */
- err = 0;
- nstbr = 0;
- bbot = au_fhsm_bottom(sb);
- for (bindex = 0; !err && bindex < bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (!au_br_fhsm(br->br_perm))
- continue;
-
- bf = br->br_fhsm;
- mutex_lock(&bf->bf_lock);
- if (bf->bf_readable) {
- err = -EFAULT;
- if (count >= sizeof(*stbr))
- err = au_fhsm_do_read_one(stbr++, &bf->bf_stfs,
- br->br_id);
- if (!err) {
- bf->bf_readable = 0;
- count -= sizeof(*stbr);
- nstbr++;
- }
- }
- mutex_unlock(&bf->bf_lock);
- }
- if (!err)
- err = sizeof(*stbr) * nstbr;
-
- return err;
-}
-
-static ssize_t au_fhsm_read(struct file *file, char __user *buf, size_t count,
- loff_t *pos)
-{
- ssize_t err;
- int readable;
- aufs_bindex_t nfhsm, bindex, bbot;
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
- struct au_branch *br;
- struct super_block *sb;
-
- err = 0;
- sbinfo = file->private_data;
- fhsm = &sbinfo->si_fhsm;
-need_data:
- spin_lock_irq(&fhsm->fhsm_wqh.lock);
- if (!atomic_read(&fhsm->fhsm_readable)) {
- if (vfsub_file_flags(file) & O_NONBLOCK)
- err = -EAGAIN;
- else
- err = wait_event_interruptible_locked_irq
- (fhsm->fhsm_wqh,
- atomic_read(&fhsm->fhsm_readable));
- }
- spin_unlock_irq(&fhsm->fhsm_wqh.lock);
- if (unlikely(err))
- goto out;
-
- /* sb may already be dead */
- au_rw_read_lock(&sbinfo->si_rwsem);
- readable = atomic_read(&fhsm->fhsm_readable);
- if (readable > 0) {
- sb = sbinfo->si_sb;
- AuDebugOn(!sb);
- /* exclude the bottom branch */
- nfhsm = 0;
- bbot = au_fhsm_bottom(sb);
- for (bindex = 0; bindex < bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_fhsm(br->br_perm))
- nfhsm++;
- }
- err = -EMSGSIZE;
- if (nfhsm * sizeof(struct aufs_stbr) <= count) {
- atomic_set(&fhsm->fhsm_readable, 0);
- err = au_fhsm_do_read(sbinfo->si_sb, (void __user *)buf,
- count);
- }
- }
- au_rw_read_unlock(&sbinfo->si_rwsem);
- if (!readable)
- goto need_data;
-
-out:
- return err;
-}
-
-static int au_fhsm_release(struct inode *inode, struct file *file)
-{
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- /* sb may already be dead */
- sbinfo = file->private_data;
- fhsm = &sbinfo->si_fhsm;
- spin_lock(&fhsm->fhsm_spin);
- fhsm->fhsm_pid = 0;
- spin_unlock(&fhsm->fhsm_spin);
- kobject_put(&sbinfo->si_kobj);
-
- return 0;
-}
-
-static const struct file_operations au_fhsm_fops = {
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
- .read = au_fhsm_read,
- .poll = au_fhsm_poll,
- .release = au_fhsm_release
-};
-
-int au_fhsm_fd(struct super_block *sb, int oflags)
-{
- int err, fd;
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
-
- err = -EPERM;
- if (unlikely(!capable(CAP_SYS_ADMIN)))
- goto out;
-
- err = -EINVAL;
- if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK)))
- goto out;
-
- err = 0;
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- spin_lock(&fhsm->fhsm_spin);
- if (!fhsm->fhsm_pid)
- fhsm->fhsm_pid = current->pid;
- else
- err = -EBUSY;
- spin_unlock(&fhsm->fhsm_spin);
- if (unlikely(err))
- goto out;
-
- oflags |= O_RDONLY;
- /* oflags |= FMODE_NONOTIFY; */
- fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags);
- err = fd;
- if (unlikely(fd < 0))
- goto out_pid;
-
- /* succeed reglardless 'fhsm' status */
- kobject_get(&sbinfo->si_kobj);
- si_noflush_read_lock(sb);
- if (au_ftest_si(sbinfo, FHSM))
- au_fhsm_wrote_all(sb, /*force*/0);
- si_read_unlock(sb);
- goto out; /* success */
-
-out_pid:
- spin_lock(&fhsm->fhsm_spin);
- fhsm->fhsm_pid = 0;
- spin_unlock(&fhsm->fhsm_spin);
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_fhsm_br_alloc(struct au_branch *br)
-{
- int err;
-
- err = 0;
- br->br_fhsm = kmalloc(sizeof(*br->br_fhsm), GFP_NOFS);
- if (br->br_fhsm)
- au_br_fhsm_init(br->br_fhsm);
- else
- err = -ENOMEM;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_fhsm_fin(struct super_block *sb)
-{
- au_fhsm_notify(sb, /*val*/-1);
-}
-
-void au_fhsm_init(struct au_sbinfo *sbinfo)
-{
- struct au_fhsm *fhsm;
-
- fhsm = &sbinfo->si_fhsm;
- spin_lock_init(&fhsm->fhsm_spin);
- init_waitqueue_head(&fhsm->fhsm_wqh);
- atomic_set(&fhsm->fhsm_readable, 0);
- fhsm->fhsm_expire
- = msecs_to_jiffies(AUFS_FHSM_CACHE_DEF_SEC * MSEC_PER_SEC);
- fhsm->fhsm_bottom = -1;
-}
-
-void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec)
-{
- sbinfo->si_fhsm.fhsm_expire
- = msecs_to_jiffies(sec * MSEC_PER_SEC);
-}
-
-void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo)
-{
- unsigned int u;
-
- if (!au_ftest_si(sbinfo, FHSM))
- return;
-
- u = jiffies_to_msecs(sbinfo->si_fhsm.fhsm_expire) / MSEC_PER_SEC;
- if (u != AUFS_FHSM_CACHE_DEF_SEC)
- seq_printf(seq, ",fhsm_sec=%u", u);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * handling file/dir, and address_space operation
- */
-
-#ifdef CONFIG_AUFS_DEBUG
-#include <linux/migrate.h>
-#endif
-#include <linux/pagemap.h>
-#include "aufs.h"
-
-/* drop flags for writing */
-unsigned int au_file_roflags(unsigned int flags)
-{
- flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
- flags |= O_RDONLY | O_NOATIME;
- return flags;
-}
-
-/* common functions to regular file and dir */
-struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
- struct file *file, int force_wr)
-{
- struct file *h_file;
- struct dentry *h_dentry;
- struct inode *h_inode;
- struct super_block *sb;
- struct au_branch *br;
- struct path h_path;
- int err;
-
- /* a race condition can happen between open and unlink/rmdir */
- h_file = ERR_PTR(-ENOENT);
- h_dentry = au_h_dptr(dentry, bindex);
- if (au_test_nfsd() && (!h_dentry || d_is_negative(h_dentry)))
- goto out;
- h_inode = d_inode(h_dentry);
- spin_lock(&h_dentry->d_lock);
- err = (!d_unhashed(dentry) && d_unlinked(h_dentry))
- /* || !d_inode(dentry)->i_nlink */
- ;
- spin_unlock(&h_dentry->d_lock);
- if (unlikely(err))
- goto out;
-
- sb = dentry->d_sb;
- br = au_sbr(sb, bindex);
- err = au_br_test_oflag(flags, br);
- h_file = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- /* drop flags for writing */
- if (au_test_ro(sb, bindex, d_inode(dentry))) {
- if (force_wr && !(flags & O_WRONLY))
- force_wr = 0;
- flags = au_file_roflags(flags);
- if (force_wr) {
- h_file = ERR_PTR(-EROFS);
- flags = au_file_roflags(flags);
- if (unlikely(vfsub_native_ro(h_inode)
- || IS_APPEND(h_inode)))
- goto out;
- flags &= ~O_ACCMODE;
- flags |= O_WRONLY;
- }
- }
- flags &= ~O_CREAT;
- au_br_get(br);
- h_path.dentry = h_dentry;
- h_path.mnt = au_br_mnt(br);
- h_file = vfsub_dentry_open(&h_path, flags);
- if (IS_ERR(h_file))
- goto out_br;
-
- if (flags & __FMODE_EXEC) {
- err = deny_write_access(h_file);
- if (unlikely(err)) {
- fput(h_file);
- h_file = ERR_PTR(err);
- goto out_br;
- }
- }
- fsnotify_open(h_file);
- goto out; /* success */
-
-out_br:
- au_br_put(br);
-out:
- return h_file;
-}
-
-static int au_cmoo(struct dentry *dentry)
-{
- int err, cmoo;
- unsigned int udba;
- struct path h_path;
- struct au_pin pin;
- struct au_cp_generic cpg = {
- .dentry = dentry,
- .bdst = -1,
- .bsrc = -1,
- .len = -1,
- .pin = &pin,
- .flags = AuCpup_DTIME | AuCpup_HOPEN
- };
- struct inode *delegated;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
- struct au_fhsm *fhsm;
- pid_t pid;
- struct au_branch *br;
- struct dentry *parent;
- struct au_hinode *hdir;
-
- DiMustWriteLock(dentry);
- IiMustWriteLock(d_inode(dentry));
-
- err = 0;
- if (IS_ROOT(dentry))
- goto out;
- cpg.bsrc = au_dbtop(dentry);
- if (!cpg.bsrc)
- goto out;
-
- sb = dentry->d_sb;
- sbinfo = au_sbi(sb);
- fhsm = &sbinfo->si_fhsm;
- pid = au_fhsm_pid(fhsm);
- if (pid
- && (current->pid == pid
- || current->real_parent->pid == pid))
- goto out;
-
- br = au_sbr(sb, cpg.bsrc);
- cmoo = au_br_cmoo(br->br_perm);
- if (!cmoo)
- goto out;
- if (!d_is_reg(dentry))
- cmoo &= AuBrAttr_COO_ALL;
- if (!cmoo)
- goto out;
-
- parent = dget_parent(dentry);
- di_write_lock_parent(parent);
- err = au_wbr_do_copyup_bu(dentry, cpg.bsrc - 1);
- cpg.bdst = err;
- if (unlikely(err < 0)) {
- err = 0; /* there is no upper writable branch */
- goto out_dgrade;
- }
- AuDbg("bsrc %d, bdst %d\n", cpg.bsrc, cpg.bdst);
-
- /* do not respect the coo attrib for the target branch */
- err = au_cpup_dirs(dentry, cpg.bdst);
- if (unlikely(err))
- goto out_dgrade;
-
- di_downgrade_lock(parent, AuLock_IR);
- udba = au_opt_udba(sb);
- err = au_pin(&pin, dentry, cpg.bdst, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_parent;
-
- err = au_sio_cpup_simple(&cpg);
- au_unpin(&pin);
- if (unlikely(err))
- goto out_parent;
- if (!(cmoo & AuBrWAttr_MOO))
- goto out_parent; /* success */
-
- err = au_pin(&pin, dentry, cpg.bsrc, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_parent;
-
- h_path.mnt = au_br_mnt(br);
- h_path.dentry = au_h_dptr(dentry, cpg.bsrc);
- hdir = au_hi(d_inode(parent), cpg.bsrc);
- delegated = NULL;
- err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, /*force*/1);
- au_unpin(&pin);
- /* todo: keep h_dentry or not? */
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- if (unlikely(err)) {
- pr_err("unlink %pd after coo failed (%d), ignored\n",
- dentry, err);
- err = 0;
- }
- goto out_parent; /* success */
-
-out_dgrade:
- di_downgrade_lock(parent, AuLock_IR);
-out_parent:
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
-out:
- AuTraceErr(err);
- return err;
-}
-
-int au_do_open(struct file *file, struct au_do_open_args *args)
-{
- int err, no_lock = args->no_lock;
- struct dentry *dentry;
- struct au_finfo *finfo;
-
- if (!no_lock)
- err = au_finfo_init(file, args->fidir);
- else {
- lockdep_off();
- err = au_finfo_init(file, args->fidir);
- lockdep_on();
- }
- if (unlikely(err))
- goto out;
-
- dentry = file->f_path.dentry;
- AuDebugOn(IS_ERR_OR_NULL(dentry));
- if (!no_lock) {
- di_write_lock_child(dentry);
- err = au_cmoo(dentry);
- di_downgrade_lock(dentry, AuLock_IR);
- if (!err)
- err = args->open(file, vfsub_file_flags(file), NULL);
- di_read_unlock(dentry, AuLock_IR);
- } else {
- err = au_cmoo(dentry);
- if (!err)
- err = args->open(file, vfsub_file_flags(file),
- args->h_file);
- if (!err && au_fbtop(file) != au_dbtop(dentry))
- /*
- * cmoo happens after h_file was opened.
- * need to refresh file later.
- */
- atomic_dec(&au_fi(file)->fi_generation);
- }
-
- finfo = au_fi(file);
- if (!err) {
- finfo->fi_file = file;
- au_sphl_add(&finfo->fi_hlist,
- &au_sbi(file->f_path.dentry->d_sb)->si_files);
- }
- if (!no_lock)
- fi_write_unlock(file);
- else {
- lockdep_off();
- fi_write_unlock(file);
- lockdep_on();
- }
- if (unlikely(err)) {
- finfo->fi_hdir = NULL;
- au_finfo_fin(file, /*atonce*/0);
- }
-
-out:
- return err;
-}
-
-int au_reopen_nondir(struct file *file)
-{
- int err;
- aufs_bindex_t btop;
- struct dentry *dentry;
- struct file *h_file, *h_file_tmp;
-
- dentry = file->f_path.dentry;
- btop = au_dbtop(dentry);
- h_file_tmp = NULL;
- if (au_fbtop(file) == btop) {
- h_file = au_hf_top(file);
- if (file->f_mode == h_file->f_mode)
- return 0; /* success */
- h_file_tmp = h_file;
- get_file(h_file_tmp);
- au_set_h_fptr(file, btop, NULL);
- }
- AuDebugOn(au_fi(file)->fi_hdir);
- /*
- * it can happen
- * file exists on both of rw and ro
- * open --> dbtop and fbtop are both 0
- * prepend a branch as rw, "rw" become ro
- * remove rw/file
- * delete the top branch, "rw" becomes rw again
- * --> dbtop is 1, fbtop is still 0
- * write --> fbtop is 0 but dbtop is 1
- */
- /* AuDebugOn(au_fbtop(file) < btop); */
-
- h_file = au_h_open(dentry, btop, vfsub_file_flags(file) & ~O_TRUNC,
- file, /*force_wr*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file)) {
- if (h_file_tmp) {
- au_sbr_get(dentry->d_sb, btop);
- au_set_h_fptr(file, btop, h_file_tmp);
- h_file_tmp = NULL;
- }
- goto out; /* todo: close all? */
- }
-
- err = 0;
- au_set_fbtop(file, btop);
- au_set_h_fptr(file, btop, h_file);
- au_update_figen(file);
- /* todo: necessary? */
- /* file->f_ra = h_file->f_ra; */
-
-out:
- if (h_file_tmp)
- fput(h_file_tmp);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_reopen_wh(struct file *file, aufs_bindex_t btgt,
- struct dentry *hi_wh)
-{
- int err;
- aufs_bindex_t btop;
- struct au_dinfo *dinfo;
- struct dentry *h_dentry;
- struct au_hdentry *hdp;
-
- dinfo = au_di(file->f_path.dentry);
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- btop = dinfo->di_btop;
- dinfo->di_btop = btgt;
- hdp = au_hdentry(dinfo, btgt);
- h_dentry = hdp->hd_dentry;
- hdp->hd_dentry = hi_wh;
- err = au_reopen_nondir(file);
- hdp->hd_dentry = h_dentry;
- dinfo->di_btop = btop;
-
- return err;
-}
-
-static int au_ready_to_write_wh(struct file *file, loff_t len,
- aufs_bindex_t bcpup, struct au_pin *pin)
-{
- int err;
- struct inode *inode, *h_inode;
- struct dentry *h_dentry, *hi_wh;
- struct au_cp_generic cpg = {
- .dentry = file->f_path.dentry,
- .bdst = bcpup,
- .bsrc = -1,
- .len = len,
- .pin = pin
- };
-
- au_update_dbtop(cpg.dentry);
- inode = d_inode(cpg.dentry);
- h_inode = NULL;
- if (au_dbtop(cpg.dentry) <= bcpup
- && au_dbbot(cpg.dentry) >= bcpup) {
- h_dentry = au_h_dptr(cpg.dentry, bcpup);
- if (h_dentry && d_is_positive(h_dentry))
- h_inode = d_inode(h_dentry);
- }
- hi_wh = au_hi_wh(inode, bcpup);
- if (!hi_wh && !h_inode)
- err = au_sio_cpup_wh(&cpg, file);
- else
- /* already copied-up after unlink */
- err = au_reopen_wh(file, bcpup, hi_wh);
-
- if (!err
- && (inode->i_nlink > 1
- || (inode->i_state & I_LINKABLE))
- && au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK))
- au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup));
-
- return err;
-}
-
-/*
- * prepare the @file for writing.
- */
-int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
-{
- int err;
- aufs_bindex_t dbtop;
- struct dentry *parent;
- struct inode *inode;
- struct super_block *sb;
- struct file *h_file;
- struct au_cp_generic cpg = {
- .dentry = file->f_path.dentry,
- .bdst = -1,
- .bsrc = -1,
- .len = len,
- .pin = pin,
- .flags = AuCpup_DTIME
- };
-
- sb = cpg.dentry->d_sb;
- inode = d_inode(cpg.dentry);
- cpg.bsrc = au_fbtop(file);
- err = au_test_ro(sb, cpg.bsrc, inode);
- if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) {
- err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE,
- /*flags*/0);
- goto out;
- }
-
- /* need to cpup or reopen */
- parent = dget_parent(cpg.dentry);
- di_write_lock_parent(parent);
- err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
- cpg.bdst = err;
- if (unlikely(err < 0))
- goto out_dgrade;
- err = 0;
-
- if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) {
- err = au_cpup_dirs(cpg.dentry, cpg.bdst);
- if (unlikely(err))
- goto out_dgrade;
- }
-
- err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_dgrade;
-
- dbtop = au_dbtop(cpg.dentry);
- if (dbtop <= cpg.bdst)
- cpg.bsrc = cpg.bdst;
-
- if (dbtop <= cpg.bdst /* just reopen */
- || !d_unhashed(cpg.dentry) /* copyup and reopen */
- ) {
- h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0);
- if (IS_ERR(h_file))
- err = PTR_ERR(h_file);
- else {
- di_downgrade_lock(parent, AuLock_IR);
- if (dbtop > cpg.bdst)
- err = au_sio_cpup_simple(&cpg);
- if (!err)
- err = au_reopen_nondir(file);
- au_h_open_post(cpg.dentry, cpg.bsrc, h_file);
- }
- } else { /* copyup as wh and reopen */
- /*
- * since writable hfsplus branch is not supported,
- * h_open_pre/post() are unnecessary.
- */
- err = au_ready_to_write_wh(file, len, cpg.bdst, pin);
- di_downgrade_lock(parent, AuLock_IR);
- }
-
- if (!err) {
- au_pin_set_parent_lflag(pin, /*lflag*/0);
- goto out_dput; /* success */
- }
- au_unpin(pin);
- goto out_unlock;
-
-out_dgrade:
- di_downgrade_lock(parent, AuLock_IR);
-out_unlock:
- di_read_unlock(parent, AuLock_IR);
-out_dput:
- dput(parent);
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_do_flush(struct file *file, fl_owner_t id,
- int (*flush)(struct file *file, fl_owner_t id))
-{
- int err;
- struct super_block *sb;
- struct inode *inode;
-
- inode = file_inode(file);
- sb = inode->i_sb;
- si_noflush_read_lock(sb);
- fi_read_lock(file);
- ii_read_lock_child(inode);
-
- err = flush(file, id);
- au_cpup_attr_timesizes(inode);
-
- ii_read_unlock(inode);
- fi_read_unlock(file);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
-{
- int err;
- struct au_pin pin;
- struct au_finfo *finfo;
- struct dentry *parent, *hi_wh;
- struct inode *inode;
- struct super_block *sb;
- struct au_cp_generic cpg = {
- .dentry = file->f_path.dentry,
- .bdst = -1,
- .bsrc = -1,
- .len = -1,
- .pin = &pin,
- .flags = AuCpup_DTIME
- };
-
- FiMustWriteLock(file);
-
- err = 0;
- finfo = au_fi(file);
- sb = cpg.dentry->d_sb;
- inode = d_inode(cpg.dentry);
- cpg.bdst = au_ibtop(inode);
- if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry))
- goto out;
-
- parent = dget_parent(cpg.dentry);
- if (au_test_ro(sb, cpg.bdst, inode)) {
- di_read_lock_parent(parent, !AuLock_IR);
- err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
- cpg.bdst = err;
- di_read_unlock(parent, !AuLock_IR);
- if (unlikely(err < 0))
- goto out_parent;
- err = 0;
- }
-
- di_read_lock_parent(parent, AuLock_IR);
- hi_wh = au_hi_wh(inode, cpg.bdst);
- if (!S_ISDIR(inode->i_mode)
- && au_opt_test(au_mntflags(sb), PLINK)
- && au_plink_test(inode)
- && !d_unhashed(cpg.dentry)
- && cpg.bdst < au_dbtop(cpg.dentry)) {
- err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst);
- if (unlikely(err))
- goto out_unlock;
-
- /* always superio. */
- err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (!err) {
- err = au_sio_cpup_simple(&cpg);
- au_unpin(&pin);
- }
- } else if (hi_wh) {
- /* already copied-up after unlink */
- err = au_reopen_wh(file, cpg.bdst, hi_wh);
- *need_reopen = 0;
- }
-
-out_unlock:
- di_read_unlock(parent, AuLock_IR);
-out_parent:
- dput(parent);
-out:
- return err;
-}
-
-static void au_do_refresh_dir(struct file *file)
-{
- int execed;
- aufs_bindex_t bindex, bbot, new_bindex, brid;
- struct au_hfile *p, tmp, *q;
- struct au_finfo *finfo;
- struct super_block *sb;
- struct au_fidir *fidir;
-
- FiMustWriteLock(file);
-
- sb = file->f_path.dentry->d_sb;
- finfo = au_fi(file);
- fidir = finfo->fi_hdir;
- AuDebugOn(!fidir);
- p = fidir->fd_hfile + finfo->fi_btop;
- brid = p->hf_br->br_id;
- bbot = fidir->fd_bbot;
- for (bindex = finfo->fi_btop; bindex <= bbot; bindex++, p++) {
- if (!p->hf_file)
- continue;
-
- new_bindex = au_br_index(sb, p->hf_br->br_id);
- if (new_bindex == bindex)
- continue;
- if (new_bindex < 0) {
- au_set_h_fptr(file, bindex, NULL);
- continue;
- }
-
- /* swap two lower inode, and loop again */
- q = fidir->fd_hfile + new_bindex;
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hf_file) {
- bindex--;
- p--;
- }
- }
-
- execed = vfsub_file_execed(file);
- p = fidir->fd_hfile;
- if (!au_test_mmapped(file) && !d_unlinked(file->f_path.dentry)) {
- bbot = au_sbbot(sb);
- for (finfo->fi_btop = 0; finfo->fi_btop <= bbot;
- finfo->fi_btop++, p++)
- if (p->hf_file) {
- if (file_inode(p->hf_file))
- break;
- au_hfput(p, execed);
- }
- } else {
- bbot = au_br_index(sb, brid);
- for (finfo->fi_btop = 0; finfo->fi_btop < bbot;
- finfo->fi_btop++, p++)
- if (p->hf_file)
- au_hfput(p, execed);
- bbot = au_sbbot(sb);
- }
-
- p = fidir->fd_hfile + bbot;
- for (fidir->fd_bbot = bbot; fidir->fd_bbot >= finfo->fi_btop;
- fidir->fd_bbot--, p--)
- if (p->hf_file) {
- if (file_inode(p->hf_file))
- break;
- au_hfput(p, execed);
- }
- AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
-}
-
-/*
- * after branch manipulating, refresh the file.
- */
-static int refresh_file(struct file *file, int (*reopen)(struct file *file))
-{
- int err, need_reopen, nbr;
- aufs_bindex_t bbot, bindex;
- struct dentry *dentry;
- struct super_block *sb;
- struct au_finfo *finfo;
- struct au_hfile *hfile;
-
- dentry = file->f_path.dentry;
- sb = dentry->d_sb;
- nbr = au_sbbot(sb) + 1;
- finfo = au_fi(file);
- if (!finfo->fi_hdir) {
- hfile = &finfo->fi_htop;
- AuDebugOn(!hfile->hf_file);
- bindex = au_br_index(sb, hfile->hf_br->br_id);
- AuDebugOn(bindex < 0);
- if (bindex != finfo->fi_btop)
- au_set_fbtop(file, bindex);
- } else {
- err = au_fidir_realloc(finfo, nbr, /*may_shrink*/0);
- if (unlikely(err))
- goto out;
- au_do_refresh_dir(file);
- }
-
- err = 0;
- need_reopen = 1;
- if (!au_test_mmapped(file))
- err = au_file_refresh_by_inode(file, &need_reopen);
- if (finfo->fi_hdir)
- /* harmless if err */
- au_fidir_realloc(finfo, nbr, /*may_shrink*/1);
- if (!err && need_reopen && !d_unlinked(dentry))
- err = reopen(file);
- if (!err) {
- au_update_figen(file);
- goto out; /* success */
- }
-
- /* error, close all lower files */
- if (finfo->fi_hdir) {
- bbot = au_fbbot_dir(file);
- for (bindex = au_fbtop(file); bindex <= bbot; bindex++)
- au_set_h_fptr(file, bindex, NULL);
- }
-
-out:
- return err;
-}
-
-/* common function to regular file and dir */
-int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
- int wlock)
-{
- int err;
- unsigned int sigen, figen;
- aufs_bindex_t btop;
- unsigned char pseudo_link;
- struct dentry *dentry;
- struct inode *inode;
-
- err = 0;
- dentry = file->f_path.dentry;
- inode = d_inode(dentry);
- sigen = au_sigen(dentry->d_sb);
- fi_write_lock(file);
- figen = au_figen(file);
- di_write_lock_child(dentry);
- btop = au_dbtop(dentry);
- pseudo_link = (btop != au_ibtop(inode));
- if (sigen == figen && !pseudo_link && au_fbtop(file) == btop) {
- if (!wlock) {
- di_downgrade_lock(dentry, AuLock_IR);
- fi_downgrade_lock(file);
- }
- goto out; /* success */
- }
-
- AuDbg("sigen %d, figen %d\n", sigen, figen);
- if (au_digen_test(dentry, sigen)) {
- err = au_reval_dpath(dentry, sigen);
- AuDebugOn(!err && au_digen_test(dentry, sigen));
- }
-
- if (!err)
- err = refresh_file(file, reopen);
- if (!err) {
- if (!wlock) {
- di_downgrade_lock(dentry, AuLock_IR);
- fi_downgrade_lock(file);
- }
- } else {
- di_write_unlock(dentry);
- fi_write_unlock(file);
- }
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* cf. aufs_nopage() */
-/* for madvise(2) */
-static int aufs_readpage(struct file *file __maybe_unused, struct page *page)
-{
- unlock_page(page);
- return 0;
-}
-
-/* it will never be called, but necessary to support O_DIRECT */
-static ssize_t aufs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
-{ BUG(); return 0; }
-
-/* they will never be called. */
-#ifdef CONFIG_AUFS_DEBUG
-static int aufs_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
-{ AuUnsupport(); return 0; }
-static int aufs_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{ AuUnsupport(); return 0; }
-static int aufs_writepage(struct page *page, struct writeback_control *wbc)
-{ AuUnsupport(); return 0; }
-
-static int aufs_set_page_dirty(struct page *page)
-{ AuUnsupport(); return 0; }
-static void aufs_invalidatepage(struct page *page, unsigned int offset,
- unsigned int length)
-{ AuUnsupport(); }
-static int aufs_releasepage(struct page *page, gfp_t gfp)
-{ AuUnsupport(); return 0; }
-#if 0 /* called by memory compaction regardless file */
-static int aufs_migratepage(struct address_space *mapping, struct page *newpage,
- struct page *page, enum migrate_mode mode)
-{ AuUnsupport(); return 0; }
-#endif
-static bool aufs_isolate_page(struct page *page, isolate_mode_t mode)
-{ AuUnsupport(); return true; }
-static void aufs_putback_page(struct page *page)
-{ AuUnsupport(); }
-static int aufs_launder_page(struct page *page)
-{ AuUnsupport(); return 0; }
-static int aufs_is_partially_uptodate(struct page *page,
- unsigned long from,
- unsigned long count)
-{ AuUnsupport(); return 0; }
-static void aufs_is_dirty_writeback(struct page *page, bool *dirty,
- bool *writeback)
-{ AuUnsupport(); }
-static int aufs_error_remove_page(struct address_space *mapping,
- struct page *page)
-{ AuUnsupport(); return 0; }
-static int aufs_swap_activate(struct swap_info_struct *sis, struct file *file,
- sector_t *span)
-{ AuUnsupport(); return 0; }
-static void aufs_swap_deactivate(struct file *file)
-{ AuUnsupport(); }
-#endif /* CONFIG_AUFS_DEBUG */
-
-const struct address_space_operations aufs_aop = {
- .readpage = aufs_readpage,
- .direct_IO = aufs_direct_IO,
-#ifdef CONFIG_AUFS_DEBUG
- .writepage = aufs_writepage,
- /* no writepages, because of writepage */
- .set_page_dirty = aufs_set_page_dirty,
- /* no readpages, because of readpage */
- .write_begin = aufs_write_begin,
- .write_end = aufs_write_end,
- /* no bmap, no block device */
- .invalidatepage = aufs_invalidatepage,
- .releasepage = aufs_releasepage,
- /* is fallback_migrate_page ok? */
- /* .migratepage = aufs_migratepage, */
- .isolate_page = aufs_isolate_page,
- .putback_page = aufs_putback_page,
- .launder_page = aufs_launder_page,
- .is_partially_uptodate = aufs_is_partially_uptodate,
- .is_dirty_writeback = aufs_is_dirty_writeback,
- .error_remove_page = aufs_error_remove_page,
- .swap_activate = aufs_swap_activate,
- .swap_deactivate = aufs_swap_deactivate
-#endif /* CONFIG_AUFS_DEBUG */
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * file operations
- */
-
-#ifndef __AUFS_FILE_H__
-#define __AUFS_FILE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include "rwsem.h"
-
-struct au_branch;
-struct au_hfile {
- struct file *hf_file;
- struct au_branch *hf_br;
-};
-
-struct au_vdir;
-struct au_fidir {
- aufs_bindex_t fd_bbot;
- aufs_bindex_t fd_nent;
- struct au_vdir *fd_vdir_cache;
- struct au_hfile fd_hfile[];
-};
-
-static inline int au_fidir_sz(int nent)
-{
- AuDebugOn(nent < 0);
- return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent;
-}
-
-struct au_finfo {
- atomic_t fi_generation;
-
- struct au_rwsem fi_rwsem;
- aufs_bindex_t fi_btop;
-
- /* do not union them */
- struct { /* for non-dir */
- struct au_hfile fi_htop;
- atomic_t fi_mmapped;
- };
- struct au_fidir *fi_hdir; /* for dir only */
-
- struct hlist_node fi_hlist;
- union {
- struct file *fi_file; /* very ugly */
- struct llist_node fi_lnode; /* delayed free */
- };
-} ____cacheline_aligned_in_smp;
-
-/* ---------------------------------------------------------------------- */
-
-/* file.c */
-extern const struct address_space_operations aufs_aop;
-unsigned int au_file_roflags(unsigned int flags);
-struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
- struct file *file, int force_wr);
-struct au_do_open_args {
- int no_lock;
- int (*open)(struct file *file, int flags,
- struct file *h_file);
- struct au_fidir *fidir;
- struct file *h_file;
-};
-int au_do_open(struct file *file, struct au_do_open_args *args);
-int au_reopen_nondir(struct file *file);
-struct au_pin;
-int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
-int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
- int wlock);
-int au_do_flush(struct file *file, fl_owner_t id,
- int (*flush)(struct file *file, fl_owner_t id));
-
-/* poll.c */
-#ifdef CONFIG_AUFS_POLL
-unsigned int aufs_poll(struct file *file, poll_table *wait);
-#endif
-
-#ifdef CONFIG_AUFS_BR_HFSPLUS
-/* hfsplus.c */
-struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
- int force_wr);
-void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file);
-#else
-AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry,
- aufs_bindex_t bindex, int force_wr)
-AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file);
-#endif
-
-/* f_op.c */
-extern const struct file_operations aufs_file_fop;
-int au_do_open_nondir(struct file *file, int flags, struct file *h_file);
-int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
-struct file *au_read_pre(struct file *file, int keep_fi);
-
-/* finfo.c */
-void au_hfput(struct au_hfile *hf, int execed);
-void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
- struct file *h_file);
-
-void au_update_figen(struct file *file);
-struct au_fidir *au_fidir_alloc(struct super_block *sb);
-int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink);
-
-void au_fi_init_once(void *_fi);
-void au_finfo_fin(struct file *file, int atonce);
-int au_finfo_init(struct file *file, struct au_fidir *fidir);
-
-/* ioctl.c */
-long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
-#ifdef CONFIG_COMPAT
-long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
- unsigned long arg);
-long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
- unsigned long arg);
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_finfo *au_fi(struct file *file)
-{
- return file->private_data;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * fi_read_lock, fi_write_lock,
- * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
- */
-AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
-
-#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
-#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
-#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: hard/soft set? */
-static inline aufs_bindex_t au_fbtop(struct file *file)
-{
- FiMustAnyLock(file);
- return au_fi(file)->fi_btop;
-}
-
-static inline aufs_bindex_t au_fbbot_dir(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_bbot;
-}
-
-static inline struct au_vdir *au_fvdir_cache(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_vdir_cache;
-}
-
-static inline void au_set_fbtop(struct file *file, aufs_bindex_t bindex)
-{
- FiMustWriteLock(file);
- au_fi(file)->fi_btop = bindex;
-}
-
-static inline void au_set_fbbot_dir(struct file *file, aufs_bindex_t bindex)
-{
- FiMustWriteLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- au_fi(file)->fi_hdir->fd_bbot = bindex;
-}
-
-static inline void au_set_fvdir_cache(struct file *file,
- struct au_vdir *vdir_cache)
-{
- FiMustWriteLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache;
-}
-
-static inline struct file *au_hf_top(struct file *file)
-{
- FiMustAnyLock(file);
- AuDebugOn(au_fi(file)->fi_hdir);
- return au_fi(file)->fi_htop.hf_file;
-}
-
-static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex)
-{
- FiMustAnyLock(file);
- AuDebugOn(!au_fi(file)->fi_hdir);
- return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file;
-}
-
-/* todo: memory barrier? */
-static inline unsigned int au_figen(struct file *f)
-{
- return atomic_read(&au_fi(f)->fi_generation);
-}
-
-static inline void au_set_mmapped(struct file *f)
-{
- if (atomic_inc_return(&au_fi(f)->fi_mmapped))
- return;
- pr_warn("fi_mmapped wrapped around\n");
- while (!atomic_inc_return(&au_fi(f)->fi_mmapped))
- ;
-}
-
-static inline void au_unset_mmapped(struct file *f)
-{
- atomic_dec(&au_fi(f)->fi_mmapped);
-}
-
-static inline int au_test_mmapped(struct file *f)
-{
- return atomic_read(&au_fi(f)->fi_mmapped);
-}
-
-/* customize vma->vm_file */
-
-static inline void au_do_vm_file_reset(struct vm_area_struct *vma,
- struct file *file)
-{
- struct file *f;
-
- f = vma->vm_file;
- get_file(file);
- vma->vm_file = file;
- fput(f);
-}
-
-#ifdef CONFIG_MMU
-#define AuDbgVmRegion(file, vma) do {} while (0)
-
-static inline void au_vm_file_reset(struct vm_area_struct *vma,
- struct file *file)
-{
- au_do_vm_file_reset(vma, file);
-}
-#else
-#define AuDbgVmRegion(file, vma) \
- AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file))
-
-static inline void au_vm_file_reset(struct vm_area_struct *vma,
- struct file *file)
-{
- struct file *f;
-
- au_do_vm_file_reset(vma, file);
- f = vma->vm_region->vm_file;
- get_file(file);
- vma->vm_region->vm_file = file;
- fput(f);
-}
-#endif /* CONFIG_MMU */
-
-/* handle vma->vm_prfile */
-static inline void au_vm_prfile_set(struct vm_area_struct *vma,
- struct file *file)
-{
- get_file(file);
- vma->vm_prfile = file;
-#ifndef CONFIG_MMU
- get_file(file);
- vma->vm_region->vm_prfile = file;
-#endif
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_FILE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * file private data
- */
-
-#include "aufs.h"
-
-void au_hfput(struct au_hfile *hf, int execed)
-{
- if (execed)
- allow_write_access(hf->hf_file);
- fput(hf->hf_file);
- hf->hf_file = NULL;
- au_br_put(hf->hf_br);
- hf->hf_br = NULL;
-}
-
-void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
-{
- struct au_finfo *finfo = au_fi(file);
- struct au_hfile *hf;
- struct au_fidir *fidir;
-
- fidir = finfo->fi_hdir;
- if (!fidir) {
- AuDebugOn(finfo->fi_btop != bindex);
- hf = &finfo->fi_htop;
- } else
- hf = fidir->fd_hfile + bindex;
-
- if (hf && hf->hf_file)
- au_hfput(hf, vfsub_file_execed(file));
- if (val) {
- FiMustWriteLock(file);
- AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry));
- hf->hf_file = val;
- hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex);
- }
-}
-
-void au_update_figen(struct file *file)
-{
- atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry));
- /* smp_mb(); */ /* atomic_set */
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_fidir *au_fidir_alloc(struct super_block *sb)
-{
- struct au_fidir *fidir;
- int nbr;
-
- nbr = au_sbbot(sb) + 1;
- if (nbr < 2)
- nbr = 2; /* initial allocate for 2 branches */
- fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS);
- if (fidir) {
- fidir->fd_bbot = -1;
- fidir->fd_nent = nbr;
- }
-
- return fidir;
-}
-
-int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink)
-{
- int err;
- struct au_fidir *fidir, *p;
-
- AuRwMustWriteLock(&finfo->fi_rwsem);
- fidir = finfo->fi_hdir;
- AuDebugOn(!fidir);
-
- err = -ENOMEM;
- p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr),
- GFP_NOFS, may_shrink);
- if (p) {
- p->fd_nent = nbr;
- finfo->fi_hdir = p;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_finfo_fin(struct file *file, int atonce)
-{
- struct au_finfo *finfo;
-
- au_nfiles_dec(file->f_path.dentry->d_sb);
-
- finfo = au_fi(file);
- AuDebugOn(finfo->fi_hdir);
- AuRwDestroy(&finfo->fi_rwsem);
- if (!atonce)
- au_cache_dfree_finfo(finfo);
- else
- au_cache_free_finfo(finfo);
-}
-
-void au_fi_init_once(void *_finfo)
-{
- struct au_finfo *finfo = _finfo;
-
- au_rw_init(&finfo->fi_rwsem);
-}
-
-int au_finfo_init(struct file *file, struct au_fidir *fidir)
-{
- int err;
- struct au_finfo *finfo;
- struct dentry *dentry;
-
- err = -ENOMEM;
- dentry = file->f_path.dentry;
- finfo = au_cache_alloc_finfo();
- if (unlikely(!finfo))
- goto out;
-
- err = 0;
- au_nfiles_inc(dentry->d_sb);
- au_rw_write_lock(&finfo->fi_rwsem);
- finfo->fi_btop = -1;
- finfo->fi_hdir = fidir;
- atomic_set(&finfo->fi_generation, au_digen(dentry));
- /* smp_mb(); */ /* atomic_set */
-
- file->private_data = finfo;
-
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * judging filesystem type
- */
-
-#ifndef __AUFS_FSTYPE_H__
-#define __AUFS_FSTYPE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/magic.h>
-#include <linux/nfs_fs.h>
-#include <linux/romfs_fs.h>
-
-static inline int au_test_aufs(struct super_block *sb)
-{
- return sb->s_magic == AUFS_SUPER_MAGIC;
-}
-
-static inline const char *au_sbtype(struct super_block *sb)
-{
- return sb->s_type->name;
-}
-
-static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_ISO9660_FS)
- return sb->s_magic == ISOFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_romfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_ROMFS_FS)
- return sb->s_magic == ROMFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_CRAMFS)
- return sb->s_magic == CRAMFS_MAGIC;
-#endif
- return 0;
-}
-
-static inline int au_test_nfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_NFS_FS)
- return sb->s_magic == NFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_fuse(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_FUSE_FS)
- return sb->s_magic == FUSE_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_xfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_XFS_FS)
- return sb->s_magic == XFS_SB_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_TMPFS
- return sb->s_magic == TMPFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_ECRYPT_FS)
- return !strcmp(au_sbtype(sb), "ecryptfs");
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_ramfs(struct super_block *sb)
-{
- return sb->s_magic == RAMFS_MAGIC;
-}
-
-static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_UBIFS_FS)
- return sb->s_magic == UBIFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_procfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_PROC_FS
- return sb->s_magic == PROC_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_SYSFS
- return sb->s_magic == SYSFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_configfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_CONFIGFS_FS)
- return sb->s_magic == CONFIGFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_minix(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_MINIX_FS)
- return sb->s_magic == MINIX3_SUPER_MAGIC
- || sb->s_magic == MINIX2_SUPER_MAGIC
- || sb->s_magic == MINIX2_SUPER_MAGIC2
- || sb->s_magic == MINIX_SUPER_MAGIC
- || sb->s_magic == MINIX_SUPER_MAGIC2;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_fat(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_FAT_FS)
- return sb->s_magic == MSDOS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_msdos(struct super_block *sb)
-{
- return au_test_fat(sb);
-}
-
-static inline int au_test_vfat(struct super_block *sb)
-{
- return au_test_fat(sb);
-}
-
-static inline int au_test_securityfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_SECURITYFS
- return sb->s_magic == SECURITYFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_squashfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_SQUASHFS)
- return sb->s_magic == SQUASHFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_btrfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_BTRFS_FS)
- return sb->s_magic == BTRFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_xenfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_XENFS)
- return sb->s_magic == XENFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
-{
-#ifdef CONFIG_DEBUG_FS
- return sb->s_magic == DEBUGFS_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_nilfs(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_NILFS)
- return sb->s_magic == NILFS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-static inline int au_test_hfsplus(struct super_block *sb __maybe_unused)
-{
-#if IS_ENABLED(CONFIG_HFSPLUS_FS)
- return sb->s_magic == HFSPLUS_SUPER_MAGIC;
-#else
- return 0;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * they can't be an aufs branch.
- */
-static inline int au_test_fs_unsuppoted(struct super_block *sb)
-{
- return
-#ifndef CONFIG_AUFS_BR_RAMFS
- au_test_ramfs(sb) ||
-#endif
- au_test_procfs(sb)
- || au_test_sysfs(sb)
- || au_test_configfs(sb)
- || au_test_debugfs(sb)
- || au_test_securityfs(sb)
- || au_test_xenfs(sb)
- || au_test_ecryptfs(sb)
- /* || !strcmp(au_sbtype(sb), "unionfs") */
- || au_test_aufs(sb); /* will be supported in next version */
-}
-
-static inline int au_test_fs_remote(struct super_block *sb)
-{
- return !au_test_tmpfs(sb)
-#ifdef CONFIG_AUFS_BR_RAMFS
- && !au_test_ramfs(sb)
-#endif
- && !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * Note: these functions (below) are created after reading ->getattr() in all
- * filesystems under linux/fs. it means we have to do so in every update...
- */
-
-/*
- * some filesystems require getattr to refresh the inode attributes before
- * referencing.
- * in most cases, we can rely on the inode attribute in NFS (or every remote fs)
- * and leave the work for d_revalidate()
- */
-static inline int au_test_fs_refresh_iattr(struct super_block *sb)
-{
- return au_test_nfs(sb)
- || au_test_fuse(sb)
- /* || au_test_btrfs(sb) */ /* untested */
- ;
-}
-
-/*
- * filesystems which don't maintain i_size or i_blocks.
- */
-static inline int au_test_fs_bad_iattr_size(struct super_block *sb)
-{
- return au_test_xfs(sb)
- || au_test_btrfs(sb)
- || au_test_ubifs(sb)
- || au_test_hfsplus(sb) /* maintained, but incorrect */
- /* || au_test_minix(sb) */ /* untested */
- ;
-}
-
-/*
- * filesystems which don't store the correct value in some of their inode
- * attributes.
- */
-static inline int au_test_fs_bad_iattr(struct super_block *sb)
-{
- return au_test_fs_bad_iattr_size(sb)
- || au_test_fat(sb)
- || au_test_msdos(sb)
- || au_test_vfat(sb);
-}
-
-/* they don't check i_nlink in link(2) */
-static inline int au_test_fs_no_limit_nlink(struct super_block *sb)
-{
- return au_test_tmpfs(sb)
-#ifdef CONFIG_AUFS_BR_RAMFS
- || au_test_ramfs(sb)
-#endif
- || au_test_ubifs(sb)
- || au_test_hfsplus(sb);
-}
-
-/*
- * filesystems which sets S_NOATIME and S_NOCMTIME.
- */
-static inline int au_test_fs_notime(struct super_block *sb)
-{
- return au_test_nfs(sb)
- || au_test_fuse(sb)
- || au_test_ubifs(sb)
- ;
-}
-
-/* temporary support for i#1 in cramfs */
-static inline int au_test_fs_unique_ino(struct inode *inode)
-{
- if (au_test_cramfs(inode->i_sb))
- return inode->i_ino != 1;
- return 1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * the filesystem where the xino files placed must support i/o after unlink and
- * maintain i_size and i_blocks.
- */
-static inline int au_test_fs_bad_xino(struct super_block *sb)
-{
- return au_test_fs_remote(sb)
- || au_test_fs_bad_iattr_size(sb)
- /* don't want unnecessary work for xino */
- || au_test_aufs(sb)
- || au_test_ecryptfs(sb)
- || au_test_nilfs(sb);
-}
-
-static inline int au_test_fs_trunc_xino(struct super_block *sb)
-{
- return au_test_tmpfs(sb)
- || au_test_ramfs(sb);
-}
-
-/*
- * test if the @sb is real-readonly.
- */
-static inline int au_test_fs_rr(struct super_block *sb)
-{
- return au_test_squashfs(sb)
- || au_test_iso9660(sb)
- || au_test_cramfs(sb)
- || au_test_romfs(sb);
-}
-
-/*
- * test if the @inode is nfs with 'noacl' option
- * NFS always sets MS_POSIXACL regardless its mount option 'noacl.'
- */
-static inline int au_test_nfs_noacl(struct inode *inode)
-{
- return au_test_nfs(inode->i_sb)
- /* && IS_POSIXACL(inode) */
- && !nfs_server_capable(inode, NFS_CAP_ACLS);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_FSTYPE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * fsnotify for the lower directories
- */
-
-#include "aufs.h"
-
-/* FS_IN_IGNORED is unnecessary */
-static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE
- | FS_CREATE | FS_EVENT_ON_CHILD);
-static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq);
-static __cacheline_aligned_in_smp atomic64_t au_hfsn_ifree = ATOMIC64_INIT(0);
-
-static void au_hfsn_free_mark(struct fsnotify_mark *mark)
-{
- struct au_hnotify *hn = container_of(mark, struct au_hnotify,
- hn_mark);
- /* AuDbg("here\n"); */
- au_cache_dfree_hnotify(hn);
- smp_mb__before_atomic();
- if (atomic64_dec_and_test(&au_hfsn_ifree))
- wake_up(&au_hfsn_wq);
-}
-
-static int au_hfsn_alloc(struct au_hinode *hinode)
-{
- int err;
- struct au_hnotify *hn;
- struct super_block *sb;
- struct au_branch *br;
- struct fsnotify_mark *mark;
- aufs_bindex_t bindex;
-
- hn = hinode->hi_notify;
- sb = hn->hn_aufs_inode->i_sb;
- bindex = au_br_index(sb, hinode->hi_id);
- br = au_sbr(sb, bindex);
- AuDebugOn(!br->br_hfsn);
-
- mark = &hn->hn_mark;
- fsnotify_init_mark(mark, au_hfsn_free_mark);
- mark->mask = AuHfsnMask;
- /*
- * by udba rename or rmdir, aufs assign a new inode to the known
- * h_inode, so specify 1 to allow dups.
- */
- lockdep_off();
- err = fsnotify_add_mark(mark, br->br_hfsn->hfsn_group, hinode->hi_inode,
- /*mnt*/NULL, /*allow_dups*/1);
- lockdep_on();
-
- return err;
-}
-
-static int au_hfsn_free(struct au_hinode *hinode, struct au_hnotify *hn)
-{
- struct fsnotify_mark *mark;
- unsigned long long ull;
- struct fsnotify_group *group;
-
- ull = atomic64_inc_return(&au_hfsn_ifree);
- BUG_ON(!ull);
-
- mark = &hn->hn_mark;
- spin_lock(&mark->lock);
- group = mark->group;
- fsnotify_get_group(group);
- spin_unlock(&mark->lock);
- lockdep_off();
- fsnotify_destroy_mark(mark, group);
- fsnotify_put_mark(mark);
- fsnotify_put_group(group);
- lockdep_on();
-
- /* free hn by myself */
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hfsn_ctl(struct au_hinode *hinode, int do_set)
-{
- struct fsnotify_mark *mark;
-
- mark = &hinode->hi_notify->hn_mark;
- spin_lock(&mark->lock);
- if (do_set) {
- AuDebugOn(mark->mask & AuHfsnMask);
- mark->mask |= AuHfsnMask;
- } else {
- AuDebugOn(!(mark->mask & AuHfsnMask));
- mark->mask &= ~AuHfsnMask;
- }
- spin_unlock(&mark->lock);
- /* fsnotify_recalc_inode_mask(hinode->hi_inode); */
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* #define AuDbgHnotify */
-#ifdef AuDbgHnotify
-static char *au_hfsn_name(u32 mask)
-{
-#ifdef CONFIG_AUFS_DEBUG
-#define test_ret(flag) \
- do { \
- if (mask & flag) \
- return #flag; \
- } while (0)
- test_ret(FS_ACCESS);
- test_ret(FS_MODIFY);
- test_ret(FS_ATTRIB);
- test_ret(FS_CLOSE_WRITE);
- test_ret(FS_CLOSE_NOWRITE);
- test_ret(FS_OPEN);
- test_ret(FS_MOVED_FROM);
- test_ret(FS_MOVED_TO);
- test_ret(FS_CREATE);
- test_ret(FS_DELETE);
- test_ret(FS_DELETE_SELF);
- test_ret(FS_MOVE_SELF);
- test_ret(FS_UNMOUNT);
- test_ret(FS_Q_OVERFLOW);
- test_ret(FS_IN_IGNORED);
- test_ret(FS_ISDIR);
- test_ret(FS_IN_ONESHOT);
- test_ret(FS_EVENT_ON_CHILD);
- return "";
-#undef test_ret
-#else
- return "??";
-#endif
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hfsn_free_group(struct fsnotify_group *group)
-{
- struct au_br_hfsnotify *hfsn = group->private;
-
- /* AuDbg("here\n"); */
- au_delayed_kfree(hfsn);
-}
-
-static int au_hfsn_handle_event(struct fsnotify_group *group,
- struct inode *inode,
- struct fsnotify_mark *inode_mark,
- struct fsnotify_mark *vfsmount_mark,
- u32 mask, void *data, int data_type,
- const unsigned char *file_name, u32 cookie)
-{
- int err;
- struct au_hnotify *hnotify;
- struct inode *h_dir, *h_inode;
- struct qstr h_child_qstr = QSTR_INIT(file_name, strlen(file_name));
-
- AuDebugOn(data_type != FSNOTIFY_EVENT_INODE);
-
- err = 0;
- /* if FS_UNMOUNT happens, there must be another bug */
- AuDebugOn(mask & FS_UNMOUNT);
- if (mask & (FS_IN_IGNORED | FS_UNMOUNT))
- goto out;
-
- h_dir = inode;
- h_inode = NULL;
-#ifdef AuDbgHnotify
- au_debug_on();
- if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1
- || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) {
- AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n",
- h_dir->i_ino, mask, au_hfsn_name(mask),
- AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0);
- /* WARN_ON(1); */
- }
- au_debug_off();
-#endif
-
- AuDebugOn(!inode_mark);
- hnotify = container_of(inode_mark, struct au_hnotify, hn_mark);
- err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode);
-
-out:
- return err;
-}
-
-static struct fsnotify_ops au_hfsn_ops = {
- .handle_event = au_hfsn_handle_event,
- .free_group_priv = au_hfsn_free_group
-};
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hfsn_fin_br(struct au_branch *br)
-{
- struct au_br_hfsnotify *hfsn;
-
- hfsn = br->br_hfsn;
- if (hfsn) {
- lockdep_off();
- fsnotify_put_group(hfsn->hfsn_group);
- lockdep_on();
- }
-}
-
-static int au_hfsn_init_br(struct au_branch *br, int perm)
-{
- int err;
- struct fsnotify_group *group;
- struct au_br_hfsnotify *hfsn;
-
- err = 0;
- br->br_hfsn = NULL;
- if (!au_br_hnotifyable(perm))
- goto out;
-
- err = -ENOMEM;
- hfsn = kmalloc(sizeof(*hfsn), GFP_NOFS);
- if (unlikely(!hfsn))
- goto out;
-
- err = 0;
- group = fsnotify_alloc_group(&au_hfsn_ops);
- if (IS_ERR(group)) {
- err = PTR_ERR(group);
- pr_err("fsnotify_alloc_group() failed, %d\n", err);
- goto out_hfsn;
- }
-
- group->private = hfsn;
- hfsn->hfsn_group = group;
- br->br_hfsn = hfsn;
- goto out; /* success */
-
-out_hfsn:
- au_delayed_kfree(hfsn);
-out:
- return err;
-}
-
-static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm)
-{
- int err;
-
- err = 0;
- if (!br->br_hfsn)
- err = au_hfsn_init_br(br, perm);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_hfsn_fin(void)
-{
- AuDbg("au_hfsn_ifree %lld\n", (long long)atomic64_read(&au_hfsn_ifree));
- wait_event(au_hfsn_wq, !atomic64_read(&au_hfsn_ifree));
-}
-
-const struct au_hnotify_op au_hnotify_op = {
- .ctl = au_hfsn_ctl,
- .alloc = au_hfsn_alloc,
- .free = au_hfsn_free,
-
- .fin = au_hfsn_fin,
-
- .reset_br = au_hfsn_reset_br,
- .fin_br = au_hfsn_fin_br,
- .init_br = au_hfsn_init_br
-};
+++ /dev/null
-/*
- * Copyright (C) 2010-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * special support for filesystems which aqucires an inode mutex
- * at final closing a file, eg, hfsplus.
- *
- * This trick is very simple and stupid, just to open the file before really
- * neceeary open to tell hfsplus that this is not the final closing.
- * The caller should call au_h_open_pre() after acquiring the inode mutex,
- * and au_h_open_post() after releasing it.
- */
-
-#include "aufs.h"
-
-struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
- int force_wr)
-{
- struct file *h_file;
- struct dentry *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- AuDebugOn(!h_dentry);
- AuDebugOn(d_is_negative(h_dentry));
-
- h_file = NULL;
- if (au_test_hfsplus(h_dentry->d_sb)
- && d_is_reg(h_dentry))
- h_file = au_h_open(dentry, bindex,
- O_RDONLY | O_NOATIME | O_LARGEFILE,
- /*file*/NULL, force_wr);
- return h_file;
-}
-
-void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
- struct file *h_file)
-{
- if (h_file) {
- fput(h_file);
- au_sbr_put(dentry->d_sb, bindex);
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * abstraction to notify the direct changes on lower directories
- */
-
-#include "aufs.h"
-
-int au_hn_alloc(struct au_hinode *hinode, struct inode *inode)
-{
- int err;
- struct au_hnotify *hn;
-
- err = -ENOMEM;
- hn = au_cache_alloc_hnotify();
- if (hn) {
- hn->hn_aufs_inode = inode;
- hinode->hi_notify = hn;
- err = au_hnotify_op.alloc(hinode);
- AuTraceErr(err);
- if (unlikely(err)) {
- hinode->hi_notify = NULL;
- au_cache_dfree_hnotify(hn);
- /*
- * The upper dir was removed by udba, but the same named
- * dir left. In this case, aufs assignes a new inode
- * number and set the monitor again.
- * For the lower dir, the old monitnor is still left.
- */
- if (err == -EEXIST)
- err = 0;
- }
- }
-
- AuTraceErr(err);
- return err;
-}
-
-void au_hn_free(struct au_hinode *hinode)
-{
- struct au_hnotify *hn;
-
- hn = hinode->hi_notify;
- if (hn) {
- hinode->hi_notify = NULL;
- if (au_hnotify_op.free(hinode, hn))
- au_cache_dfree_hnotify(hn);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_hn_ctl(struct au_hinode *hinode, int do_set)
-{
- if (hinode->hi_notify)
- au_hnotify_op.ctl(hinode, do_set);
-}
-
-void au_hn_reset(struct inode *inode, unsigned int flags)
-{
- aufs_bindex_t bindex, bbot;
- struct inode *hi;
- struct dentry *iwhdentry;
-
- bbot = au_ibbot(inode);
- for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) {
- hi = au_h_iptr(inode, bindex);
- if (!hi)
- continue;
-
- /* inode_lock_nested(hi, AuLsc_I_CHILD); */
- iwhdentry = au_hi_wh(inode, bindex);
- if (iwhdentry)
- dget(iwhdentry);
- au_igrab(hi);
- au_set_h_iptr(inode, bindex, NULL, 0);
- au_set_h_iptr(inode, bindex, au_igrab(hi),
- flags & ~AuHi_XINO);
- iput(hi);
- dput(iwhdentry);
- /* inode_unlock(hi); */
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int hn_xino(struct inode *inode, struct inode *h_inode)
-{
- int err;
- aufs_bindex_t bindex, bbot, bfound, btop;
- struct inode *h_i;
-
- err = 0;
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warn("branch root dir was changed\n");
- goto out;
- }
-
- bfound = -1;
- bbot = au_ibbot(inode);
- btop = au_ibtop(inode);
-#if 0 /* reserved for future use */
- if (bindex == bbot) {
- /* keep this ino in rename case */
- goto out;
- }
-#endif
- for (bindex = btop; bindex <= bbot; bindex++)
- if (au_h_iptr(inode, bindex) == h_inode) {
- bfound = bindex;
- break;
- }
- if (bfound < 0)
- goto out;
-
- for (bindex = btop; bindex <= bbot; bindex++) {
- h_i = au_h_iptr(inode, bindex);
- if (!h_i)
- continue;
-
- err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0);
- /* ignore this error */
- /* bad action? */
- }
-
- /* children inode number will be broken */
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int hn_gen_tree(struct dentry *dentry)
-{
- int err, i, j, ndentry;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, dentry, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- struct dentry *d;
-
- d = dentries[j];
- if (IS_ROOT(d))
- continue;
-
- au_digen_dec(d);
- if (d_really_is_positive(d))
- /* todo: reset children xino?
- cached children only? */
- au_iigen_dec(d_inode(d));
- }
- }
-
-out_dpages:
- au_dpages_free(&dpages);
-
-#if 0
- /* discard children */
- dentry_unhash(dentry);
- dput(dentry);
-#endif
-out:
- return err;
-}
-
-/*
- * return 0 if processed.
- */
-static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode,
- const unsigned int isdir)
-{
- int err;
- struct dentry *d;
- struct qstr *dname;
-
- err = 1;
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warn("branch root dir was changed\n");
- err = 0;
- goto out;
- }
-
- if (!isdir) {
- AuDebugOn(!name);
- au_iigen_dec(inode);
- spin_lock(&inode->i_lock);
- hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) {
- spin_lock(&d->d_lock);
- dname = &d->d_name;
- if (dname->len != nlen
- && memcmp(dname->name, name, nlen)) {
- spin_unlock(&d->d_lock);
- continue;
- }
- err = 0;
- au_digen_dec(d);
- spin_unlock(&d->d_lock);
- break;
- }
- spin_unlock(&inode->i_lock);
- } else {
- au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR);
- d = d_find_any_alias(inode);
- if (!d) {
- au_iigen_dec(inode);
- goto out;
- }
-
- spin_lock(&d->d_lock);
- dname = &d->d_name;
- if (dname->len == nlen && !memcmp(dname->name, name, nlen)) {
- spin_unlock(&d->d_lock);
- err = hn_gen_tree(d);
- spin_lock(&d->d_lock);
- }
- spin_unlock(&d->d_lock);
- dput(d);
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir)
-{
- int err;
-
- if (IS_ROOT(dentry)) {
- pr_warn("branch root dir was changed\n");
- return 0;
- }
-
- err = 0;
- if (!isdir) {
- au_digen_dec(dentry);
- if (d_really_is_positive(dentry))
- au_iigen_dec(d_inode(dentry));
- } else {
- au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR);
- if (d_really_is_positive(dentry))
- err = hn_gen_tree(dentry);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* hnotify job flags */
-#define AuHnJob_XINO0 1
-#define AuHnJob_GEN (1 << 1)
-#define AuHnJob_DIRENT (1 << 2)
-#define AuHnJob_ISDIR (1 << 3)
-#define AuHnJob_TRYXINO0 (1 << 4)
-#define AuHnJob_MNTPNT (1 << 5)
-#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name)
-#define au_fset_hnjob(flags, name) \
- do { (flags) |= AuHnJob_##name; } while (0)
-#define au_fclr_hnjob(flags, name) \
- do { (flags) &= ~AuHnJob_##name; } while (0)
-
-enum {
- AuHn_CHILD,
- AuHn_PARENT,
- AuHnLast
-};
-
-struct au_hnotify_args {
- struct inode *h_dir, *dir, *h_child_inode;
- u32 mask;
- unsigned int flags[AuHnLast];
- unsigned int h_child_nlen;
- char h_child_name[];
-};
-
-struct hn_job_args {
- unsigned int flags;
- struct inode *inode, *h_inode, *dir, *h_dir;
- struct dentry *dentry;
- char *h_name;
- int h_nlen;
-};
-
-static int hn_job(struct hn_job_args *a)
-{
- const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR);
- int e;
-
- /* reset xino */
- if (au_ftest_hnjob(a->flags, XINO0) && a->inode)
- hn_xino(a->inode, a->h_inode); /* ignore this error */
-
- if (au_ftest_hnjob(a->flags, TRYXINO0)
- && a->inode
- && a->h_inode) {
- inode_lock_nested(a->h_inode, AuLsc_I_CHILD);
- if (!a->h_inode->i_nlink
- && !(a->h_inode->i_state & I_LINKABLE))
- hn_xino(a->inode, a->h_inode); /* ignore this error */
- inode_unlock(a->h_inode);
- }
-
- /* make the generation obsolete */
- if (au_ftest_hnjob(a->flags, GEN)) {
- e = -1;
- if (a->inode)
- e = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode,
- isdir);
- if (e && a->dentry)
- hn_gen_by_name(a->dentry, isdir);
- /* ignore this error */
- }
-
- /* make dir entries obsolete */
- if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) {
- struct au_vdir *vdir;
-
- vdir = au_ivdir(a->inode);
- if (vdir)
- vdir->vd_jiffy = 0;
- /* IMustLock(a->inode); */
- /* a->inode->i_version++; */
- }
-
- /* can do nothing but warn */
- if (au_ftest_hnjob(a->flags, MNTPNT)
- && a->dentry
- && d_mountpoint(a->dentry))
- pr_warn("mount-point %pd is removed or renamed\n", a->dentry);
-
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen,
- struct inode *dir)
-{
- struct dentry *dentry, *d, *parent;
- struct qstr *dname;
-
- parent = d_find_any_alias(dir);
- if (!parent)
- return NULL;
-
- dentry = NULL;
- spin_lock(&parent->d_lock);
- list_for_each_entry(d, &parent->d_subdirs, d_child) {
- /* AuDbg("%pd\n", d); */
- spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
- dname = &d->d_name;
- if (dname->len != nlen || memcmp(dname->name, name, nlen))
- goto cont_unlock;
- if (au_di(d))
- au_digen_dec(d);
- else
- goto cont_unlock;
- if (au_dcount(d) > 0) {
- dentry = dget_dlock(d);
- spin_unlock(&d->d_lock);
- break;
- }
-
-cont_unlock:
- spin_unlock(&d->d_lock);
- }
- spin_unlock(&parent->d_lock);
- dput(parent);
-
- if (dentry)
- di_write_lock_child(dentry);
-
- return dentry;
-}
-
-static struct inode *lookup_wlock_by_ino(struct super_block *sb,
- aufs_bindex_t bindex, ino_t h_ino)
-{
- struct inode *inode;
- ino_t ino;
- int err;
-
- inode = NULL;
- err = au_xino_read(sb, bindex, h_ino, &ino);
- if (!err && ino)
- inode = ilookup(sb, ino);
- if (!inode)
- goto out;
-
- if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
- pr_warn("wrong root branch\n");
- iput(inode);
- inode = NULL;
- goto out;
- }
-
- ii_write_lock_child(inode);
-
-out:
- return inode;
-}
-
-static void au_hn_bh(void *_args)
-{
- struct au_hnotify_args *a = _args;
- struct super_block *sb;
- aufs_bindex_t bindex, bbot, bfound;
- unsigned char xino, try_iput;
- int err;
- struct inode *inode;
- ino_t h_ino;
- struct hn_job_args args;
- struct dentry *dentry;
- struct au_sbinfo *sbinfo;
-
- AuDebugOn(!_args);
- AuDebugOn(!a->h_dir);
- AuDebugOn(!a->dir);
- AuDebugOn(!a->mask);
- AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n",
- a->mask, a->dir->i_ino, a->h_dir->i_ino,
- a->h_child_inode ? a->h_child_inode->i_ino : 0);
-
- inode = NULL;
- dentry = NULL;
- /*
- * do not lock a->dir->i_mutex here
- * because of d_revalidate() may cause a deadlock.
- */
- sb = a->dir->i_sb;
- AuDebugOn(!sb);
- sbinfo = au_sbi(sb);
- AuDebugOn(!sbinfo);
- si_write_lock(sb, AuLock_NOPLMW);
-
- ii_read_lock_parent(a->dir);
- bfound = -1;
- bbot = au_ibbot(a->dir);
- for (bindex = au_ibtop(a->dir); bindex <= bbot; bindex++)
- if (au_h_iptr(a->dir, bindex) == a->h_dir) {
- bfound = bindex;
- break;
- }
- ii_read_unlock(a->dir);
- if (unlikely(bfound < 0))
- goto out;
-
- xino = !!au_opt_test(au_mntflags(sb), XINO);
- h_ino = 0;
- if (a->h_child_inode)
- h_ino = a->h_child_inode->i_ino;
-
- if (a->h_child_nlen
- && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT)))
- dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen,
- a->dir);
- try_iput = 0;
- if (dentry && d_really_is_positive(dentry))
- inode = d_inode(dentry);
- if (xino && !inode && h_ino
- && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0)
- || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) {
- inode = lookup_wlock_by_ino(sb, bfound, h_ino);
- try_iput = 1;
- }
-
- args.flags = a->flags[AuHn_CHILD];
- args.dentry = dentry;
- args.inode = inode;
- args.h_inode = a->h_child_inode;
- args.dir = a->dir;
- args.h_dir = a->h_dir;
- args.h_name = a->h_child_name;
- args.h_nlen = a->h_child_nlen;
- err = hn_job(&args);
- if (dentry) {
- if (au_di(dentry))
- di_write_unlock(dentry);
- dput(dentry);
- }
- if (inode && try_iput) {
- ii_write_unlock(inode);
- iput(inode);
- }
-
- ii_write_lock_parent(a->dir);
- args.flags = a->flags[AuHn_PARENT];
- args.dentry = NULL;
- args.inode = a->dir;
- args.h_inode = a->h_dir;
- args.dir = NULL;
- args.h_dir = NULL;
- args.h_name = NULL;
- args.h_nlen = 0;
- err = hn_job(&args);
- ii_write_unlock(a->dir);
-
-out:
- iput(a->h_child_inode);
- iput(a->h_dir);
- iput(a->dir);
- si_write_unlock(sb);
- au_nwt_done(&sbinfo->si_nowait);
- au_delayed_kfree(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
- struct qstr *h_child_qstr, struct inode *h_child_inode)
-{
- int err, len;
- unsigned int flags[AuHnLast], f;
- unsigned char isdir, isroot, wh;
- struct inode *dir;
- struct au_hnotify_args *args;
- char *p, *h_child_name;
-
- err = 0;
- AuDebugOn(!hnotify || !hnotify->hn_aufs_inode);
- dir = igrab(hnotify->hn_aufs_inode);
- if (!dir)
- goto out;
-
- isroot = (dir->i_ino == AUFS_ROOT_INO);
- wh = 0;
- h_child_name = (void *)h_child_qstr->name;
- len = h_child_qstr->len;
- if (h_child_name) {
- if (len > AUFS_WH_PFX_LEN
- && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- h_child_name += AUFS_WH_PFX_LEN;
- len -= AUFS_WH_PFX_LEN;
- wh = 1;
- }
- }
-
- isdir = 0;
- if (h_child_inode)
- isdir = !!S_ISDIR(h_child_inode->i_mode);
- flags[AuHn_PARENT] = AuHnJob_ISDIR;
- flags[AuHn_CHILD] = 0;
- if (isdir)
- flags[AuHn_CHILD] = AuHnJob_ISDIR;
- au_fset_hnjob(flags[AuHn_PARENT], DIRENT);
- au_fset_hnjob(flags[AuHn_CHILD], GEN);
- switch (mask & FS_EVENTS_POSS_ON_CHILD) {
- case FS_MOVED_FROM:
- case FS_MOVED_TO:
- au_fset_hnjob(flags[AuHn_CHILD], XINO0);
- au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
- /*FALLTHROUGH*/
- case FS_CREATE:
- AuDebugOn(!h_child_name);
- break;
-
- case FS_DELETE:
- /*
- * aufs never be able to get this child inode.
- * revalidation should be in d_revalidate()
- * by checking i_nlink, i_generation or d_unhashed().
- */
- AuDebugOn(!h_child_name);
- au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0);
- au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
- break;
-
- default:
- AuDebugOn(1);
- }
-
- if (wh)
- h_child_inode = NULL;
-
- err = -ENOMEM;
- /* iput() and kfree() will be called in au_hnotify() */
- args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS);
- if (unlikely(!args)) {
- AuErr1("no memory\n");
- iput(dir);
- goto out;
- }
- args->flags[AuHn_PARENT] = flags[AuHn_PARENT];
- args->flags[AuHn_CHILD] = flags[AuHn_CHILD];
- args->mask = mask;
- args->dir = dir;
- args->h_dir = igrab(h_dir);
- if (h_child_inode)
- h_child_inode = igrab(h_child_inode); /* can be NULL */
- args->h_child_inode = h_child_inode;
- args->h_child_nlen = len;
- if (len) {
- p = (void *)args;
- p += sizeof(*args);
- memcpy(p, h_child_name, len);
- p[len] = 0;
- }
-
- /* NFS fires the event for silly-renamed one from kworker */
- f = 0;
- if (!dir->i_nlink
- || (au_test_nfs(h_dir->i_sb) && (mask & FS_DELETE)))
- f = AuWkq_NEST;
- err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f);
- if (unlikely(err)) {
- pr_err("wkq %d\n", err);
- iput(args->h_child_inode);
- iput(args->h_dir);
- iput(args->dir);
- au_delayed_kfree(args);
- }
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm)
-{
- int err;
-
- AuDebugOn(!(udba & AuOptMask_UDBA));
-
- err = 0;
- if (au_hnotify_op.reset_br)
- err = au_hnotify_op.reset_br(udba, br, perm);
-
- return err;
-}
-
-int au_hnotify_init_br(struct au_branch *br, int perm)
-{
- int err;
-
- err = 0;
- if (au_hnotify_op.init_br)
- err = au_hnotify_op.init_br(br, perm);
-
- return err;
-}
-
-void au_hnotify_fin_br(struct au_branch *br)
-{
- if (au_hnotify_op.fin_br)
- au_hnotify_op.fin_br(br);
-}
-
-static void au_hn_destroy_cache(void)
-{
- struct au_cache *cp;
-
- flush_delayed_work(&au_dfree.dwork);
- cp = au_dfree.cache + AuCache_HNOTIFY;
- AuDebugOn(!llist_empty(&cp->llist));
- kmem_cache_destroy(cp->cache);
- cp->cache = NULL;
-}
-
-AU_CACHE_DFREE_FUNC(hnotify, HNOTIFY, hn_lnode);
-
-int __init au_hnotify_init(void)
-{
- int err;
- struct au_cache *cp;
-
- err = -ENOMEM;
- cp = au_dfree.cache + AuCache_HNOTIFY;
- cp->cache = AuCache(au_hnotify);
- if (cp->cache) {
- err = 0;
- if (au_hnotify_op.init)
- err = au_hnotify_op.init();
- if (unlikely(err))
- au_hn_destroy_cache();
- }
- AuTraceErr(err);
- return err;
-}
-
-void au_hnotify_fin(void)
-{
- struct au_cache *cp;
-
- if (au_hnotify_op.fin)
- au_hnotify_op.fin();
-
- /* cf. au_cache_fin() */
- cp = au_dfree.cache + AuCache_HNOTIFY;
- if (cp->cache)
- au_hn_destroy_cache();
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode operations (except add/del/rename)
- */
-
-#include <linux/device_cgroup.h>
-#include <linux/fs_stack.h>
-#include <linux/namei.h>
-#include <linux/security.h>
-#include "aufs.h"
-
-static int h_permission(struct inode *h_inode, int mask,
- struct path *h_path, int brperm)
-{
- int err;
- const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
-
- err = -EPERM;
- if (write_mask && IS_IMMUTABLE(h_inode))
- goto out;
-
- err = -EACCES;
- if (((mask & MAY_EXEC)
- && S_ISREG(h_inode->i_mode)
- && (path_noexec(h_path)
- || !(h_inode->i_mode & S_IXUGO))))
- goto out;
-
- /*
- * - skip the lower fs test in the case of write to ro branch.
- * - nfs dir permission write check is optimized, but a policy for
- * link/rename requires a real check.
- * - nfs always sets MS_POSIXACL regardless its mount option 'noacl.'
- * in this case, generic_permission() returns -EOPNOTSUPP.
- */
- if ((write_mask && !au_br_writable(brperm))
- || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode)
- && write_mask && !(mask & MAY_READ))
- || !h_inode->i_op->permission) {
- /* AuLabel(generic_permission); */
- /* AuDbg("get_acl %pf\n", h_inode->i_op->get_acl); */
- err = generic_permission(h_inode, mask);
- if (err == -EOPNOTSUPP && au_test_nfs_noacl(h_inode))
- err = h_inode->i_op->permission(h_inode, mask);
- AuTraceErr(err);
- } else {
- /* AuLabel(h_inode->permission); */
- err = h_inode->i_op->permission(h_inode, mask);
- AuTraceErr(err);
- }
-
- if (!err)
- err = devcgroup_inode_permission(h_inode, mask);
- if (!err)
- err = security_inode_permission(h_inode, mask);
-
-#if 0
- if (!err) {
- /* todo: do we need to call ima_path_check()? */
- struct path h_path = {
- .dentry =
- .mnt = h_mnt
- };
- err = ima_path_check(&h_path,
- mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
- IMA_COUNT_LEAVE);
- }
-#endif
-
-out:
- return err;
-}
-
-static int aufs_permission(struct inode *inode, int mask)
-{
- int err;
- aufs_bindex_t bindex, bbot;
- const unsigned char isdir = !!S_ISDIR(inode->i_mode),
- write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
- struct inode *h_inode;
- struct super_block *sb;
- struct au_branch *br;
-
- /* todo: support rcu-walk? */
- if (mask & MAY_NOT_BLOCK)
- return -ECHILD;
-
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH);
- ii_read_lock_child(inode);
-#if 0
- err = au_iigen_test(inode, au_sigen(sb));
- if (unlikely(err))
- goto out;
-#endif
-
- if (!isdir
- || write_mask
- || au_opt_test(au_mntflags(sb), DIRPERM1)) {
- err = au_busy_or_stale();
- h_inode = au_h_iptr(inode, au_ibtop(inode));
- if (unlikely(!h_inode
- || (h_inode->i_mode & S_IFMT)
- != (inode->i_mode & S_IFMT)))
- goto out;
-
- err = 0;
- bindex = au_ibtop(inode);
- br = au_sbr(sb, bindex);
- err = h_permission(h_inode, mask, &br->br_path, br->br_perm);
- if (write_mask
- && !err
- && !special_file(h_inode->i_mode)) {
- /* test whether the upper writable branch exists */
- err = -EROFS;
- for (; bindex >= 0; bindex--)
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = 0;
- break;
- }
- }
- goto out;
- }
-
- /* non-write to dir */
- err = 0;
- bbot = au_ibbot(inode);
- for (bindex = au_ibtop(inode); !err && bindex <= bbot; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (h_inode) {
- err = au_busy_or_stale();
- if (unlikely(!S_ISDIR(h_inode->i_mode)))
- break;
-
- br = au_sbr(sb, bindex);
- err = h_permission(h_inode, mask, &br->br_path,
- br->br_perm);
- }
- }
-
-out:
- ii_read_unlock(inode);
- si_read_unlock(sb);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
-{
- struct dentry *ret, *parent;
- struct inode *inode;
- struct super_block *sb;
- int err, npositive;
-
- IMustLock(dir);
-
- /* todo: support rcu-walk? */
- ret = ERR_PTR(-ECHILD);
- if (flags & LOOKUP_RCU)
- goto out;
-
- ret = ERR_PTR(-ENAMETOOLONG);
- if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- goto out;
-
- sb = dir->i_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- ret = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- err = au_di_init(dentry);
- ret = ERR_PTR(err);
- if (unlikely(err))
- goto out_si;
-
- inode = NULL;
- npositive = 0; /* suppress a warning */
- parent = dentry->d_parent; /* dir inode is locked */
- di_read_lock_parent(parent, AuLock_IR);
- err = au_alive_dir(parent);
- if (!err)
- err = au_digen_test(parent, au_sigen(sb));
- if (!err) {
- /* regardless LOOKUP_CREATE, always ALLOW_NEG */
- npositive = au_lkup_dentry(dentry, au_dbtop(parent),
- AuLkup_ALLOW_NEG);
- err = npositive;
- }
- di_read_unlock(parent, AuLock_IR);
- ret = ERR_PTR(err);
- if (unlikely(err < 0))
- goto out_unlock;
-
- if (npositive) {
- inode = au_new_inode(dentry, /*must_new*/0);
- if (IS_ERR(inode)) {
- ret = (void *)inode;
- inode = NULL;
- goto out_unlock;
- }
- }
-
- if (inode)
- atomic_inc(&inode->i_count);
- ret = d_splice_alias(inode, dentry);
-#if 0
- if (unlikely(d_need_lookup(dentry))) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
- spin_unlock(&dentry->d_lock);
- } else
-#endif
- if (inode) {
- if (!IS_ERR(ret)) {
- iput(inode);
- if (ret && ret != dentry)
- ii_write_unlock(inode);
- } else {
- ii_write_unlock(inode);
- iput(inode);
- inode = NULL;
- }
- }
-
-out_unlock:
- di_write_unlock(dentry);
-out_si:
- si_read_unlock(sb);
-out:
- return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct aopen_node {
- struct hlist_node hlist;
- struct file *file, *h_file;
-};
-
-static int au_do_aopen(struct inode *inode, struct file *file)
-{
- struct au_sphlhead *aopen;
- struct aopen_node *node;
- struct au_do_open_args args = {
- .no_lock = 1,
- .open = au_do_open_nondir
- };
-
- aopen = &au_sbi(inode->i_sb)->si_aopen;
- spin_lock(&aopen->spin);
- hlist_for_each_entry(node, &aopen->head, hlist)
- if (node->file == file) {
- args.h_file = node->h_file;
- break;
- }
- spin_unlock(&aopen->spin);
- /* AuDebugOn(!args.h_file); */
-
- return au_do_open(file, &args);
-}
-
-static int aufs_atomic_open(struct inode *dir, struct dentry *dentry,
- struct file *file, unsigned int open_flag,
- umode_t create_mode, int *opened)
-{
- int err, h_opened = *opened;
- unsigned int lkup_flags;
- struct dentry *parent, *d;
- struct au_sphlhead *aopen;
- struct vfsub_aopen_args args = {
- .open_flag = open_flag,
- .create_mode = create_mode,
- .opened = &h_opened
- };
- struct aopen_node aopen_node = {
- .file = file
- };
-
- IMustLock(dir);
- AuDbg("open_flag 0%o\n", open_flag);
- AuDbgDentry(dentry);
-
- err = 0;
- if (!au_di(dentry)) {
- lkup_flags = LOOKUP_OPEN;
- if (open_flag & O_CREAT)
- lkup_flags |= LOOKUP_CREATE;
- d = aufs_lookup(dir, dentry, lkup_flags);
- if (IS_ERR(d)) {
- err = PTR_ERR(d);
- AuTraceErr(err);
- goto out;
- } else if (d) {
- /*
- * obsoleted dentry found.
- * another error will be returned later.
- */
- d_drop(d);
- AuDbgDentry(d);
- dput(d);
- }
- AuDbgDentry(dentry);
- }
-
- if (d_is_positive(dentry)
- || d_unhashed(dentry)
- || d_unlinked(dentry)
- || !(open_flag & O_CREAT))
- goto out_no_open;
-
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
- if (unlikely(err))
- goto out;
-
- parent = dentry->d_parent; /* dir is locked */
- di_write_lock_parent(parent);
- err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG);
- if (unlikely(err))
- goto out_unlock;
-
- AuDbgDentry(dentry);
- if (d_is_positive(dentry))
- goto out_unlock;
-
- args.file = get_empty_filp();
- err = PTR_ERR(args.file);
- if (IS_ERR(args.file))
- goto out_unlock;
-
- args.file->f_flags = file->f_flags;
- err = au_aopen_or_create(dir, dentry, &args);
- AuTraceErr(err);
- AuDbgFile(args.file);
- if (unlikely(err < 0)) {
- if (h_opened & FILE_OPENED)
- fput(args.file);
- else
- put_filp(args.file);
- goto out_unlock;
- }
-
- /* some filesystems don't set FILE_CREATED while succeeded? */
- *opened |= FILE_CREATED;
- if (h_opened & FILE_OPENED)
- aopen_node.h_file = args.file;
- else {
- put_filp(args.file);
- args.file = NULL;
- }
- aopen = &au_sbi(dir->i_sb)->si_aopen;
- au_sphl_add(&aopen_node.hlist, aopen);
- err = finish_open(file, dentry, au_do_aopen, opened);
- au_sphl_del(&aopen_node.hlist, aopen);
- AuTraceErr(err);
- AuDbgFile(file);
- if (aopen_node.h_file)
- fput(aopen_node.h_file);
-
-out_unlock:
- di_write_unlock(parent);
- aufs_read_unlock(dentry, AuLock_DW);
- AuDbgDentry(dentry);
- if (unlikely(err < 0))
- goto out;
-out_no_open:
- if (err >= 0 && !(*opened & FILE_CREATED)) {
- AuLabel(out_no_open);
- dget(dentry);
- err = finish_no_open(file, dentry);
- }
-out:
- AuDbg("%pd%s%s\n", dentry,
- (*opened & FILE_CREATED) ? " created" : "",
- (*opened & FILE_OPENED) ? " opened" : "");
- AuTraceErr(err);
- return err;
-}
-
-
-/* ---------------------------------------------------------------------- */
-
-static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
- const unsigned char add_entry, aufs_bindex_t bcpup,
- aufs_bindex_t btop)
-{
- int err;
- struct dentry *h_parent;
- struct inode *h_dir;
-
- if (add_entry)
- IMustLock(d_inode(parent));
- else
- di_write_lock_parent(parent);
-
- err = 0;
- if (!au_h_dptr(parent, bcpup)) {
- if (btop > bcpup)
- err = au_cpup_dirs(dentry, bcpup);
- else if (btop < bcpup)
- err = au_cpdown_dirs(dentry, bcpup);
- else
- BUG();
- }
- if (!err && add_entry && !au_ftest_wrdir(add_entry, TMPFILE)) {
- h_parent = au_h_dptr(parent, bcpup);
- h_dir = d_inode(h_parent);
- inode_lock_nested(h_dir, AuLsc_I_PARENT);
- err = au_lkup_neg(dentry, bcpup, /*wh*/0);
- /* todo: no unlock here */
- inode_unlock(h_dir);
-
- AuDbg("bcpup %d\n", bcpup);
- if (!err) {
- if (d_really_is_negative(dentry))
- au_set_h_dptr(dentry, btop, NULL);
- au_update_dbrange(dentry, /*do_put_zero*/0);
- }
- }
-
- if (!add_entry)
- di_write_unlock(parent);
- if (!err)
- err = bcpup; /* success */
-
- AuTraceErr(err);
- return err;
-}
-
-/*
- * decide the branch and the parent dir where we will create a new entry.
- * returns new bindex or an error.
- * copyup the parent dir if needed.
- */
-int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
- struct au_wr_dir_args *args)
-{
- int err;
- unsigned int flags;
- aufs_bindex_t bcpup, btop, src_btop;
- const unsigned char add_entry
- = au_ftest_wrdir(args->flags, ADD_ENTRY)
- | au_ftest_wrdir(args->flags, TMPFILE);
- struct super_block *sb;
- struct dentry *parent;
- struct au_sbinfo *sbinfo;
-
- sb = dentry->d_sb;
- sbinfo = au_sbi(sb);
- parent = dget_parent(dentry);
- btop = au_dbtop(dentry);
- bcpup = btop;
- if (args->force_btgt < 0) {
- if (src_dentry) {
- src_btop = au_dbtop(src_dentry);
- if (src_btop < btop)
- bcpup = src_btop;
- } else if (add_entry) {
- flags = 0;
- if (au_ftest_wrdir(args->flags, ISDIR))
- au_fset_wbr(flags, DIR);
- err = AuWbrCreate(sbinfo, dentry, flags);
- bcpup = err;
- }
-
- if (bcpup < 0 || au_test_ro(sb, bcpup, d_inode(dentry))) {
- if (add_entry)
- err = AuWbrCopyup(sbinfo, dentry);
- else {
- if (!IS_ROOT(dentry)) {
- di_read_lock_parent(parent, !AuLock_IR);
- err = AuWbrCopyup(sbinfo, dentry);
- di_read_unlock(parent, !AuLock_IR);
- } else
- err = AuWbrCopyup(sbinfo, dentry);
- }
- bcpup = err;
- if (unlikely(err < 0))
- goto out;
- }
- } else {
- bcpup = args->force_btgt;
- AuDebugOn(au_test_ro(sb, bcpup, d_inode(dentry)));
- }
-
- AuDbg("btop %d, bcpup %d\n", btop, bcpup);
- err = bcpup;
- if (bcpup == btop)
- goto out; /* success */
-
- /* copyup the new parent into the branch we process */
- err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, btop);
- if (err >= 0) {
- if (d_really_is_negative(dentry)) {
- au_set_h_dptr(dentry, btop, NULL);
- au_set_dbtop(dentry, bcpup);
- au_set_dbbot(dentry, bcpup);
- }
- AuDebugOn(add_entry
- && !au_ftest_wrdir(args->flags, TMPFILE)
- && !au_h_dptr(dentry, bcpup));
- }
-
-out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_pin_hdir_unlock(struct au_pin *p)
-{
- if (p->hdir)
- au_hn_inode_unlock(p->hdir);
-}
-
-int au_pin_hdir_lock(struct au_pin *p)
-{
- int err;
-
- err = 0;
- if (!p->hdir)
- goto out;
-
- /* even if an error happens later, keep this lock */
- au_hn_inode_lock_nested(p->hdir, p->lsc_hi);
-
- err = -EBUSY;
- if (unlikely(p->hdir->hi_inode != d_inode(p->h_parent)))
- goto out;
-
- err = 0;
- if (p->h_dentry)
- err = au_h_verify(p->h_dentry, p->udba, p->hdir->hi_inode,
- p->h_parent, p->br);
-
-out:
- return err;
-}
-
-int au_pin_hdir_relock(struct au_pin *p)
-{
- int err, i;
- struct inode *h_i;
- struct dentry *h_d[] = {
- p->h_dentry,
- p->h_parent
- };
-
- err = au_pin_hdir_lock(p);
- if (unlikely(err))
- goto out;
-
- for (i = 0; !err && i < sizeof(h_d)/sizeof(*h_d); i++) {
- if (!h_d[i])
- continue;
- if (d_is_positive(h_d[i])) {
- h_i = d_inode(h_d[i]);
- err = !h_i->i_nlink;
- }
- }
-
-out:
- return err;
-}
-
-static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task)
-{
-#if !defined(CONFIG_RWSEM_GENERIC_SPINLOCK) && defined(CONFIG_RWSEM_SPIN_ON_OWNER)
- p->hdir->hi_inode->i_rwsem.owner = task;
-#endif
-}
-
-void au_pin_hdir_acquire_nest(struct au_pin *p)
-{
- if (p->hdir) {
- rwsem_acquire_nest(&p->hdir->hi_inode->i_rwsem.dep_map,
- p->lsc_hi, 0, NULL, _RET_IP_);
- au_pin_hdir_set_owner(p, current);
- }
-}
-
-void au_pin_hdir_release(struct au_pin *p)
-{
- if (p->hdir) {
- au_pin_hdir_set_owner(p, p->task);
- rwsem_release(&p->hdir->hi_inode->i_rwsem.dep_map, 1, _RET_IP_);
- }
-}
-
-struct dentry *au_pinned_h_parent(struct au_pin *pin)
-{
- if (pin && pin->parent)
- return au_h_dptr(pin->parent, pin->bindex);
- return NULL;
-}
-
-void au_unpin(struct au_pin *p)
-{
- if (p->hdir)
- au_pin_hdir_unlock(p);
- if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE))
- vfsub_mnt_drop_write(p->h_mnt);
- if (!p->hdir)
- return;
-
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_unlock(p->parent, AuLock_IR);
- iput(p->hdir->hi_inode);
- dput(p->parent);
- p->parent = NULL;
- p->hdir = NULL;
- p->h_mnt = NULL;
- /* do not clear p->task */
-}
-
-int au_do_pin(struct au_pin *p)
-{
- int err;
- struct super_block *sb;
- struct inode *h_dir;
-
- err = 0;
- sb = p->dentry->d_sb;
- p->br = au_sbr(sb, p->bindex);
- if (IS_ROOT(p->dentry)) {
- if (au_ftest_pin(p->flags, MNT_WRITE)) {
- p->h_mnt = au_br_mnt(p->br);
- err = vfsub_mnt_want_write(p->h_mnt);
- if (unlikely(err)) {
- au_fclr_pin(p->flags, MNT_WRITE);
- goto out_err;
- }
- }
- goto out;
- }
-
- p->h_dentry = NULL;
- if (p->bindex <= au_dbbot(p->dentry))
- p->h_dentry = au_h_dptr(p->dentry, p->bindex);
-
- p->parent = dget_parent(p->dentry);
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_lock(p->parent, AuLock_IR, p->lsc_di);
-
- h_dir = NULL;
- p->h_parent = au_h_dptr(p->parent, p->bindex);
- p->hdir = au_hi(d_inode(p->parent), p->bindex);
- if (p->hdir)
- h_dir = p->hdir->hi_inode;
-
- /*
- * udba case, or
- * if DI_LOCKED is not set, then p->parent may be different
- * and h_parent can be NULL.
- */
- if (unlikely(!p->hdir || !h_dir || !p->h_parent)) {
- err = -EBUSY;
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_unlock(p->parent, AuLock_IR);
- dput(p->parent);
- p->parent = NULL;
- goto out_err;
- }
-
- if (au_ftest_pin(p->flags, MNT_WRITE)) {
- p->h_mnt = au_br_mnt(p->br);
- err = vfsub_mnt_want_write(p->h_mnt);
- if (unlikely(err)) {
- au_fclr_pin(p->flags, MNT_WRITE);
- if (!au_ftest_pin(p->flags, DI_LOCKED))
- di_read_unlock(p->parent, AuLock_IR);
- dput(p->parent);
- p->parent = NULL;
- goto out_err;
- }
- }
-
- au_igrab(h_dir);
- err = au_pin_hdir_lock(p);
- if (!err)
- goto out; /* success */
-
- au_unpin(p);
-
-out_err:
- pr_err("err %d\n", err);
- err = au_busy_or_stale();
-out:
- return err;
-}
-
-void au_pin_init(struct au_pin *p, struct dentry *dentry,
- aufs_bindex_t bindex, int lsc_di, int lsc_hi,
- unsigned int udba, unsigned char flags)
-{
- p->dentry = dentry;
- p->udba = udba;
- p->lsc_di = lsc_di;
- p->lsc_hi = lsc_hi;
- p->flags = flags;
- p->bindex = bindex;
-
- p->parent = NULL;
- p->hdir = NULL;
- p->h_mnt = NULL;
-
- p->h_dentry = NULL;
- p->h_parent = NULL;
- p->br = NULL;
- p->task = current;
-}
-
-int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int udba, unsigned char flags)
-{
- au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2,
- udba, flags);
- return au_do_pin(pin);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * ->setattr() and ->getattr() are called in various cases.
- * chmod, stat: dentry is revalidated.
- * fchmod, fstat: file and dentry are not revalidated, additionally they may be
- * unhashed.
- * for ->setattr(), ia->ia_file is passed from ftruncate only.
- */
-/* todo: consolidate with do_refresh() and simple_reval_dpath() */
-int au_reval_for_attr(struct dentry *dentry, unsigned int sigen)
-{
- int err;
- struct dentry *parent;
-
- err = 0;
- if (au_digen_test(dentry, sigen)) {
- parent = dget_parent(dentry);
- di_read_lock_parent(parent, AuLock_IR);
- err = au_refresh_dentry(dentry, parent);
- di_read_unlock(parent, AuLock_IR);
- dput(parent);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
- struct au_icpup_args *a)
-{
- int err;
- loff_t sz;
- aufs_bindex_t btop, ibtop;
- struct dentry *hi_wh, *parent;
- struct inode *inode;
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = 0
- };
-
- if (d_is_dir(dentry))
- au_fset_wrdir(wr_dir_args.flags, ISDIR);
- /* plink or hi_wh() case */
- btop = au_dbtop(dentry);
- inode = d_inode(dentry);
- ibtop = au_ibtop(inode);
- if (btop != ibtop && !au_test_ro(inode->i_sb, ibtop, inode))
- wr_dir_args.force_btgt = ibtop;
- err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
- if (unlikely(err < 0))
- goto out;
- a->btgt = err;
- if (err != btop)
- au_fset_icpup(a->flags, DID_CPUP);
-
- err = 0;
- a->pin_flags = AuPin_MNT_WRITE;
- parent = NULL;
- if (!IS_ROOT(dentry)) {
- au_fset_pin(a->pin_flags, DI_LOCKED);
- parent = dget_parent(dentry);
- di_write_lock_parent(parent);
- }
-
- err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags);
- if (unlikely(err))
- goto out_parent;
-
- sz = -1;
- a->h_path.dentry = au_h_dptr(dentry, btop);
- a->h_inode = d_inode(a->h_path.dentry);
- if (ia && (ia->ia_valid & ATTR_SIZE)) {
- inode_lock_nested(a->h_inode, AuLsc_I_CHILD);
- if (ia->ia_size < i_size_read(a->h_inode))
- sz = ia->ia_size;
- inode_unlock(a->h_inode);
- }
-
- hi_wh = NULL;
- if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) {
- hi_wh = au_hi_wh(inode, a->btgt);
- if (!hi_wh) {
- struct au_cp_generic cpg = {
- .dentry = dentry,
- .bdst = a->btgt,
- .bsrc = -1,
- .len = sz,
- .pin = &a->pin
- };
- err = au_sio_cpup_wh(&cpg, /*file*/NULL);
- if (unlikely(err))
- goto out_unlock;
- hi_wh = au_hi_wh(inode, a->btgt);
- /* todo: revalidate hi_wh? */
- }
- }
-
- if (parent) {
- au_pin_set_parent_lflag(&a->pin, /*lflag*/0);
- di_downgrade_lock(parent, AuLock_IR);
- dput(parent);
- parent = NULL;
- }
- if (!au_ftest_icpup(a->flags, DID_CPUP))
- goto out; /* success */
-
- if (!d_unhashed(dentry)) {
- struct au_cp_generic cpg = {
- .dentry = dentry,
- .bdst = a->btgt,
- .bsrc = btop,
- .len = sz,
- .pin = &a->pin,
- .flags = AuCpup_DTIME | AuCpup_HOPEN
- };
- err = au_sio_cpup_simple(&cpg);
- if (!err)
- a->h_path.dentry = au_h_dptr(dentry, a->btgt);
- } else if (!hi_wh)
- a->h_path.dentry = au_h_dptr(dentry, a->btgt);
- else
- a->h_path.dentry = hi_wh; /* do not dget here */
-
-out_unlock:
- a->h_inode = d_inode(a->h_path.dentry);
- if (!err)
- goto out; /* success */
- au_unpin(&a->pin);
-out_parent:
- if (parent) {
- di_write_unlock(parent);
- dput(parent);
- }
-out:
- if (!err)
- inode_lock_nested(a->h_inode, AuLsc_I_CHILD);
- return err;
-}
-
-static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
-{
- int err;
- struct inode *inode, *delegated;
- struct super_block *sb;
- struct file *file;
- struct au_icpup_args *a;
-
- inode = d_inode(dentry);
- IMustLock(inode);
-
- err = -ENOMEM;
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
- ia->ia_valid &= ~ATTR_MODE;
-
- file = NULL;
- sb = dentry->d_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out_kfree;
-
- if (ia->ia_valid & ATTR_FILE) {
- /* currently ftruncate(2) only */
- AuDebugOn(!d_is_reg(dentry));
- file = ia->ia_file;
- err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
- if (unlikely(err))
- goto out_si;
- ia->ia_file = au_hf_top(file);
- a->udba = AuOpt_UDBA_NONE;
- } else {
- /* fchmod() doesn't pass ia_file */
- a->udba = au_opt_udba(sb);
- di_write_lock_child(dentry);
- /* no d_unlinked(), to set UDBA_NONE for root */
- if (d_unhashed(dentry))
- a->udba = AuOpt_UDBA_NONE;
- if (a->udba != AuOpt_UDBA_NONE) {
- AuDebugOn(IS_ROOT(dentry));
- err = au_reval_for_attr(dentry, au_sigen(sb));
- if (unlikely(err))
- goto out_dentry;
- }
- }
-
- err = au_pin_and_icpup(dentry, ia, a);
- if (unlikely(err < 0))
- goto out_dentry;
- if (au_ftest_icpup(a->flags, DID_CPUP)) {
- ia->ia_file = NULL;
- ia->ia_valid &= ~ATTR_FILE;
- }
-
- a->h_path.mnt = au_sbr_mnt(sb, a->btgt);
- if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME))
- == (ATTR_MODE | ATTR_CTIME)) {
- err = security_path_chmod(&a->h_path, ia->ia_mode);
- if (unlikely(err))
- goto out_unlock;
- } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID))
- && (ia->ia_valid & ATTR_CTIME)) {
- err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid);
- if (unlikely(err))
- goto out_unlock;
- }
-
- if (ia->ia_valid & ATTR_SIZE) {
- struct file *f;
-
- if (ia->ia_size < i_size_read(inode))
- /* unmap only */
- truncate_setsize(inode, ia->ia_size);
-
- f = NULL;
- if (ia->ia_valid & ATTR_FILE)
- f = ia->ia_file;
- inode_unlock(a->h_inode);
- err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f);
- inode_lock_nested(a->h_inode, AuLsc_I_CHILD);
- } else {
- delegated = NULL;
- while (1) {
- err = vfsub_notify_change(&a->h_path, ia, &delegated);
- if (delegated) {
- err = break_deleg_wait(&delegated);
- if (!err)
- continue;
- }
- break;
- }
- }
- /*
- * regardless aufs 'acl' option setting.
- * why don't all acl-aware fs call this func from their ->setattr()?
- */
- if (!err && (ia->ia_valid & ATTR_MODE))
- err = vfsub_acl_chmod(a->h_inode, ia->ia_mode);
- if (!err)
- au_cpup_attr_changeable(inode);
-
-out_unlock:
- inode_unlock(a->h_inode);
- au_unpin(&a->pin);
- if (unlikely(err))
- au_update_dbtop(dentry);
-out_dentry:
- di_write_unlock(dentry);
- if (file) {
- fi_write_unlock(file);
- ia->ia_file = file;
- ia->ia_valid |= ATTR_FILE;
- }
-out_si:
- si_read_unlock(sb);
-out_kfree:
- au_delayed_kfree(a);
-out:
- AuTraceErr(err);
- return err;
-}
-
-#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL)
-static int au_h_path_to_set_attr(struct dentry *dentry,
- struct au_icpup_args *a, struct path *h_path)
-{
- int err;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- a->udba = au_opt_udba(sb);
- /* no d_unlinked(), to set UDBA_NONE for root */
- if (d_unhashed(dentry))
- a->udba = AuOpt_UDBA_NONE;
- if (a->udba != AuOpt_UDBA_NONE) {
- AuDebugOn(IS_ROOT(dentry));
- err = au_reval_for_attr(dentry, au_sigen(sb));
- if (unlikely(err))
- goto out;
- }
- err = au_pin_and_icpup(dentry, /*ia*/NULL, a);
- if (unlikely(err < 0))
- goto out;
-
- h_path->dentry = a->h_path.dentry;
- h_path->mnt = au_sbr_mnt(sb, a->btgt);
-
-out:
- return err;
-}
-
-ssize_t au_srxattr(struct dentry *dentry, struct inode *inode,
- struct au_srxattr *arg)
-{
- int err;
- struct path h_path;
- struct super_block *sb;
- struct au_icpup_args *a;
- struct inode *h_inode;
-
- IMustLock(inode);
-
- err = -ENOMEM;
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- sb = dentry->d_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out_kfree;
-
- h_path.dentry = NULL; /* silence gcc */
- di_write_lock_child(dentry);
- err = au_h_path_to_set_attr(dentry, a, &h_path);
- if (unlikely(err))
- goto out_di;
-
- inode_unlock(a->h_inode);
- switch (arg->type) {
- case AU_XATTR_SET:
- AuDebugOn(d_is_negative(h_path.dentry));
- err = vfsub_setxattr(h_path.dentry,
- arg->u.set.name, arg->u.set.value,
- arg->u.set.size, arg->u.set.flags);
- break;
- case AU_XATTR_REMOVE:
- err = vfsub_removexattr(h_path.dentry, arg->u.remove.name);
- break;
- case AU_ACL_SET:
- err = -EOPNOTSUPP;
- h_inode = d_inode(h_path.dentry);
- if (h_inode->i_op->set_acl)
- err = h_inode->i_op->set_acl(h_inode,
- arg->u.acl_set.acl,
- arg->u.acl_set.type);
- break;
- }
- if (!err)
- au_cpup_attr_timesizes(inode);
-
- au_unpin(&a->pin);
- if (unlikely(err))
- au_update_dbtop(dentry);
-
-out_di:
- di_write_unlock(dentry);
- si_read_unlock(sb);
-out_kfree:
- au_delayed_kfree(a);
-out:
- AuTraceErr(err);
- return err;
-}
-#endif
-
-static void au_refresh_iattr(struct inode *inode, struct kstat *st,
- unsigned int nlink)
-{
- unsigned int n;
-
- inode->i_mode = st->mode;
- /* don't i_[ug]id_write() here */
- inode->i_uid = st->uid;
- inode->i_gid = st->gid;
- inode->i_atime = st->atime;
- inode->i_mtime = st->mtime;
- inode->i_ctime = st->ctime;
-
- au_cpup_attr_nlink(inode, /*force*/0);
- if (S_ISDIR(inode->i_mode)) {
- n = inode->i_nlink;
- n -= nlink;
- n += st->nlink;
- smp_mb(); /* for i_nlink */
- /* 0 can happen */
- set_nlink(inode, n);
- }
-
- spin_lock(&inode->i_lock);
- inode->i_blocks = st->blocks;
- i_size_write(inode, st->size);
- spin_unlock(&inode->i_lock);
-}
-
-/*
- * common routine for aufs_getattr() and aufs_getxattr().
- * returns zero or negative (an error).
- * @dentry will be read-locked in success.
- */
-int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path)
-{
- int err;
- unsigned int mnt_flags, sigen;
- unsigned char udba_none;
- aufs_bindex_t bindex;
- struct super_block *sb, *h_sb;
- struct inode *inode;
-
- h_path->mnt = NULL;
- h_path->dentry = NULL;
-
- err = 0;
- sb = dentry->d_sb;
- mnt_flags = au_mntflags(sb);
- udba_none = !!au_opt_test(mnt_flags, UDBA_NONE);
-
- /* support fstat(2) */
- if (!d_unlinked(dentry) && !udba_none) {
- sigen = au_sigen(sb);
- err = au_digen_test(dentry, sigen);
- if (!err) {
- di_read_lock_child(dentry, AuLock_IR);
- err = au_dbrange_test(dentry);
- if (unlikely(err)) {
- di_read_unlock(dentry, AuLock_IR);
- goto out;
- }
- } else {
- AuDebugOn(IS_ROOT(dentry));
- di_write_lock_child(dentry);
- err = au_dbrange_test(dentry);
- if (!err)
- err = au_reval_for_attr(dentry, sigen);
- if (!err)
- di_downgrade_lock(dentry, AuLock_IR);
- else {
- di_write_unlock(dentry);
- goto out;
- }
- }
- } else
- di_read_lock_child(dentry, AuLock_IR);
-
- inode = d_inode(dentry);
- bindex = au_ibtop(inode);
- h_path->mnt = au_sbr_mnt(sb, bindex);
- h_sb = h_path->mnt->mnt_sb;
- if (!force
- && !au_test_fs_bad_iattr(h_sb)
- && udba_none)
- goto out; /* success */
-
- if (au_dbtop(dentry) == bindex)
- h_path->dentry = au_h_dptr(dentry, bindex);
- else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) {
- h_path->dentry = au_plink_lkup(inode, bindex);
- if (IS_ERR(h_path->dentry))
- /* pretending success */
- h_path->dentry = NULL;
- else
- dput(h_path->dentry);
- }
-
-out:
- return err;
-}
-
-static int aufs_getattr(struct vfsmount *mnt __maybe_unused,
- struct dentry *dentry, struct kstat *st)
-{
- int err;
- unsigned char positive;
- struct path h_path;
- struct inode *inode;
- struct super_block *sb;
-
- inode = d_inode(dentry);
- sb = dentry->d_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out;
- err = au_h_path_getattr(dentry, /*force*/0, &h_path);
- if (unlikely(err))
- goto out_si;
- if (unlikely(!h_path.dentry))
- /* illegally overlapped or something */
- goto out_fill; /* pretending success */
-
- positive = d_is_positive(h_path.dentry);
- if (positive)
- err = vfs_getattr(&h_path, st);
- if (!err) {
- if (positive)
- au_refresh_iattr(inode, st,
- d_inode(h_path.dentry)->i_nlink);
- goto out_fill; /* success */
- }
- AuTraceErr(err);
- goto out_di;
-
-out_fill:
- generic_fillattr(inode, st);
-out_di:
- di_read_unlock(dentry, AuLock_IR);
-out_si:
- si_read_unlock(sb);
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static const char *aufs_get_link(struct dentry *dentry, struct inode *inode,
- struct delayed_call *done)
-{
- const char *ret;
- struct dentry *h_dentry;
- struct inode *h_inode;
- int err;
- aufs_bindex_t bindex;
-
- ret = NULL; /* suppress a warning */
- err = -ECHILD;
- if (!dentry)
- goto out;
-
- err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN);
- if (unlikely(err))
- goto out;
-
- err = au_d_hashed_positive(dentry);
- if (unlikely(err))
- goto out_unlock;
-
- err = -EINVAL;
- inode = d_inode(dentry);
- bindex = au_ibtop(inode);
- h_inode = au_h_iptr(inode, bindex);
- if (unlikely(!h_inode->i_op->get_link))
- goto out_unlock;
-
- err = -EBUSY;
- h_dentry = NULL;
- if (au_dbtop(dentry) <= bindex) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry)
- dget(h_dentry);
- }
- if (!h_dentry) {
- h_dentry = d_find_any_alias(h_inode);
- if (IS_ERR(h_dentry)) {
- err = PTR_ERR(h_dentry);
- goto out_unlock;
- }
- }
- if (unlikely(!h_dentry))
- goto out_unlock;
-
- err = 0;
- AuDbg("%pf\n", h_inode->i_op->get_link);
- AuDbgDentry(h_dentry);
- ret = h_inode->i_op->get_link(h_dentry, h_inode, done);
- dput(h_dentry);
- if (IS_ERR(ret))
- err = PTR_ERR(ret);
-
-out_unlock:
- aufs_read_unlock(dentry, AuLock_IR);
-out:
- if (unlikely(err))
- ret = ERR_PTR(err);
- AuTraceErrPtr(ret);
- return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_is_special(struct inode *inode)
-{
- return (inode->i_mode & (S_IFBLK | S_IFCHR | S_IFIFO | S_IFSOCK));
-}
-
-static int aufs_update_time(struct inode *inode, struct timespec *ts, int flags)
-{
- int err;
- aufs_bindex_t bindex;
- struct super_block *sb;
- struct inode *h_inode;
- struct vfsmount *h_mnt;
-
- sb = inode->i_sb;
- WARN_ONCE((flags & S_ATIME) && !IS_NOATIME(inode),
- "unexpected s_flags 0x%lx", sb->s_flags);
-
- /* mmap_sem might be acquired already, cf. aufs_mmap() */
- lockdep_off();
- si_read_lock(sb, AuLock_FLUSH);
- ii_write_lock_child(inode);
- lockdep_on();
-
- err = 0;
- bindex = au_ibtop(inode);
- h_inode = au_h_iptr(inode, bindex);
- if (!au_test_ro(sb, bindex, inode)) {
- h_mnt = au_sbr_mnt(sb, bindex);
- err = vfsub_mnt_want_write(h_mnt);
- if (!err) {
- err = vfsub_update_time(h_inode, ts, flags);
- vfsub_mnt_drop_write(h_mnt);
- }
- } else if (au_is_special(h_inode)) {
- /*
- * Never copy-up here.
- * These special files may already be opened and used for
- * communicating. If we copied it up, then the communication
- * would be corrupted.
- */
- AuWarn1("timestamps for i%lu are ignored "
- "since it is on readonly branch (hi%lu).\n",
- inode->i_ino, h_inode->i_ino);
- } else if (flags & ~S_ATIME) {
- err = -EIO;
- AuIOErr1("unexpected flags 0x%x\n", flags);
- AuDebugOn(1);
- }
-
- lockdep_off();
- if (!err)
- au_cpup_attr_timesizes(inode);
- ii_write_unlock(inode);
- si_read_unlock(sb);
- lockdep_on();
-
- if (!err && (flags & S_VERSION))
- inode_inc_iversion(inode);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* no getattr version will be set by module.c:aufs_init() */
-struct inode_operations aufs_iop_nogetattr[AuIop_Last],
- aufs_iop[] = {
- [AuIop_SYMLINK] = {
- .permission = aufs_permission,
-#ifdef CONFIG_FS_POSIX_ACL
- .get_acl = aufs_get_acl,
- .set_acl = aufs_set_acl, /* unsupport for symlink? */
-#endif
-
- .setattr = aufs_setattr,
- .getattr = aufs_getattr,
-
-#ifdef CONFIG_AUFS_XATTR
- .setxattr = aufs_setxattr,
- .getxattr = aufs_getxattr,
- .listxattr = aufs_listxattr,
- .removexattr = aufs_removexattr,
-#endif
-
- .readlink = generic_readlink,
- .get_link = aufs_get_link,
-
- /* .update_time = aufs_update_time */
- },
- [AuIop_DIR] = {
- .create = aufs_create,
- .lookup = aufs_lookup,
- .link = aufs_link,
- .unlink = aufs_unlink,
- .symlink = aufs_symlink,
- .mkdir = aufs_mkdir,
- .rmdir = aufs_rmdir,
- .mknod = aufs_mknod,
- .rename = aufs_rename,
-
- .permission = aufs_permission,
-#ifdef CONFIG_FS_POSIX_ACL
- .get_acl = aufs_get_acl,
- .set_acl = aufs_set_acl,
-#endif
-
- .setattr = aufs_setattr,
- .getattr = aufs_getattr,
-
-#ifdef CONFIG_AUFS_XATTR
- .setxattr = aufs_setxattr,
- .getxattr = aufs_getxattr,
- .listxattr = aufs_listxattr,
- .removexattr = aufs_removexattr,
-#endif
-
- .update_time = aufs_update_time,
- .atomic_open = aufs_atomic_open,
- .tmpfile = aufs_tmpfile
- },
- [AuIop_OTHER] = {
- .permission = aufs_permission,
-#ifdef CONFIG_FS_POSIX_ACL
- .get_acl = aufs_get_acl,
- .set_acl = aufs_set_acl,
-#endif
-
- .setattr = aufs_setattr,
- .getattr = aufs_getattr,
-
-#ifdef CONFIG_AUFS_XATTR
- .setxattr = aufs_setxattr,
- .getxattr = aufs_getxattr,
- .listxattr = aufs_listxattr,
- .removexattr = aufs_removexattr,
-#endif
-
- .update_time = aufs_update_time
- }
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode operations (add entry)
- */
-
-#include "aufs.h"
-
-/*
- * final procedure of adding a new entry, except link(2).
- * remove whiteout, instantiate, copyup the parent dir's times and size
- * and update version.
- * if it failed, re-create the removed whiteout.
- */
-static int epilog(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct dentry *dentry)
-{
- int err, rerr;
- aufs_bindex_t bwh;
- struct path h_path;
- struct super_block *sb;
- struct inode *inode, *h_dir;
- struct dentry *wh;
-
- bwh = -1;
- sb = dir->i_sb;
- if (wh_dentry) {
- h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */
- IMustLock(h_dir);
- AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
- bwh = au_dbwh(dentry);
- h_path.dentry = wh_dentry;
- h_path.mnt = au_sbr_mnt(sb, bindex);
- err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path,
- dentry);
- if (unlikely(err))
- goto out;
- }
-
- inode = au_new_inode(dentry, /*must_new*/1);
- if (!IS_ERR(inode)) {
- d_instantiate(dentry, inode);
- dir = d_inode(dentry->d_parent); /* dir inode is locked */
- IMustLock(dir);
- au_dir_ts(dir, bindex);
- dir->i_version++;
- au_fhsm_wrote(sb, bindex, /*force*/0);
- return 0; /* success */
- }
-
- err = PTR_ERR(inode);
- if (!wh_dentry)
- goto out;
-
- /* revert */
- /* dir inode is locked */
- wh = au_wh_create(dentry, bwh, wh_dentry->d_parent);
- rerr = PTR_ERR(wh);
- if (IS_ERR(wh)) {
- AuIOErr("%pd reverting whiteout failed(%d, %d)\n",
- dentry, err, rerr);
- err = -EIO;
- } else
- dput(wh);
-
-out:
- return err;
-}
-
-static int au_d_may_add(struct dentry *dentry)
-{
- int err;
-
- err = 0;
- if (unlikely(d_unhashed(dentry)))
- err = -ENOENT;
- if (unlikely(d_really_is_positive(dentry)))
- err = -EEXIST;
- return err;
-}
-
-/*
- * simple tests for the adding inode operations.
- * following the checks in vfs, plus the parent-child relationship.
- */
-int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir)
-{
- int err;
- umode_t h_mode;
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- err = -ENAMETOOLONG;
- if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- goto out;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (d_really_is_negative(dentry)) {
- err = -EEXIST;
- if (unlikely(d_is_positive(h_dentry)))
- goto out;
- } else {
- /* rename(2) case */
- err = -EIO;
- if (unlikely(d_is_negative(h_dentry)))
- goto out;
- h_inode = d_inode(h_dentry);
- if (unlikely(!h_inode->i_nlink))
- goto out;
-
- h_mode = h_inode->i_mode;
- if (!isdir) {
- err = -EISDIR;
- if (unlikely(S_ISDIR(h_mode)))
- goto out;
- } else if (unlikely(!S_ISDIR(h_mode))) {
- err = -ENOTDIR;
- goto out;
- }
- }
-
- err = 0;
- /* expected parent dir is locked */
- if (unlikely(h_parent != h_dentry->d_parent))
- err = -EIO;
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/*
- * initial procedure of adding a new entry.
- * prepare writable branch and the parent dir, lock it,
- * and lookup whiteout for the new entry.
- */
-static struct dentry*
-lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
- struct dentry *src_dentry, struct au_pin *pin,
- struct au_wr_dir_args *wr_dir_args)
-{
- struct dentry *wh_dentry, *h_parent;
- struct super_block *sb;
- struct au_branch *br;
- int err;
- unsigned int udba;
- aufs_bindex_t bcpup;
-
- AuDbg("%pd\n", dentry);
-
- err = au_wr_dir(dentry, src_dentry, wr_dir_args);
- bcpup = err;
- wh_dentry = ERR_PTR(err);
- if (unlikely(err < 0))
- goto out;
-
- sb = dentry->d_sb;
- udba = au_opt_udba(sb);
- err = au_pin(pin, dentry, bcpup, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- h_parent = au_pinned_h_parent(pin);
- if (udba != AuOpt_UDBA_NONE
- && au_dbtop(dentry) == bcpup)
- err = au_may_add(dentry, bcpup, h_parent,
- au_ftest_wrdir(wr_dir_args->flags, ISDIR));
- else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
- err = -ENAMETOOLONG;
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_unpin;
-
- br = au_sbr(sb, bcpup);
- if (dt) {
- struct path tmp = {
- .dentry = h_parent,
- .mnt = au_br_mnt(br)
- };
- au_dtime_store(dt, au_pinned_parent(pin), &tmp);
- }
-
- wh_dentry = NULL;
- if (bcpup != au_dbwh(dentry))
- goto out; /* success */
-
- /*
- * ENAMETOOLONG here means that if we allowed create such name, then it
- * would not be able to removed in the future. So we don't allow such
- * name here and we don't handle ENAMETOOLONG differently here.
- */
- wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
-
-out_unpin:
- if (IS_ERR(wh_dentry))
- au_unpin(pin);
-out:
- return wh_dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-enum { Mknod, Symlink, Creat };
-struct simple_arg {
- int type;
- union {
- struct {
- umode_t mode;
- bool want_excl;
- bool try_aopen;
- struct vfsub_aopen_args *aopen;
- } c;
- struct {
- const char *symname;
- } s;
- struct {
- umode_t mode;
- dev_t dev;
- } m;
- } u;
-};
-
-static int add_simple(struct inode *dir, struct dentry *dentry,
- struct simple_arg *arg)
-{
- int err, rerr;
- aufs_bindex_t btop;
- unsigned char created;
- const unsigned char try_aopen
- = (arg->type == Creat && arg->u.c.try_aopen);
- struct dentry *wh_dentry, *parent;
- struct inode *h_dir;
- struct super_block *sb;
- struct au_branch *br;
- /* to reuduce stack size */
- struct {
- struct au_dtime dt;
- struct au_pin pin;
- struct path h_path;
- struct au_wr_dir_args wr_dir_args;
- } *a;
-
- AuDbg("%pd\n", dentry);
- IMustLock(dir);
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
- a->wr_dir_args.force_btgt = -1;
- a->wr_dir_args.flags = AuWrDir_ADD_ENTRY;
-
- parent = dentry->d_parent; /* dir inode is locked */
- if (!try_aopen) {
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
- if (unlikely(err))
- goto out_free;
- }
- err = au_d_may_add(dentry);
- if (unlikely(err))
- goto out_unlock;
- if (!try_aopen)
- di_write_lock_parent(parent);
- wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
- &a->pin, &a->wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_parent;
-
- btop = au_dbtop(dentry);
- sb = dentry->d_sb;
- br = au_sbr(sb, btop);
- a->h_path.dentry = au_h_dptr(dentry, btop);
- a->h_path.mnt = au_br_mnt(br);
- h_dir = au_pinned_h_dir(&a->pin);
- switch (arg->type) {
- case Creat:
- err = 0;
- if (!try_aopen || !h_dir->i_op->atomic_open)
- err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode,
- arg->u.c.want_excl);
- else
- err = vfsub_atomic_open(h_dir, a->h_path.dentry,
- arg->u.c.aopen, br);
- break;
- case Symlink:
- err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname);
- break;
- case Mknod:
- err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode,
- arg->u.m.dev);
- break;
- default:
- BUG();
- }
- created = !err;
- if (!err)
- err = epilog(dir, btop, wh_dentry, dentry);
-
- /* revert */
- if (unlikely(created && err && d_is_positive(a->h_path.dentry))) {
- /* no delegation since it is just created */
- rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL,
- /*force*/0);
- if (rerr) {
- AuIOErr("%pd revert failure(%d, %d)\n",
- dentry, err, rerr);
- err = -EIO;
- }
- au_dtime_revert(&a->dt);
- }
-
- if (!err && try_aopen && !h_dir->i_op->atomic_open)
- *arg->u.c.aopen->opened |= FILE_CREATED;
-
- au_unpin(&a->pin);
- dput(wh_dentry);
-
-out_parent:
- if (!try_aopen)
- di_write_unlock(parent);
-out_unlock:
- if (unlikely(err)) {
- au_update_dbtop(dentry);
- d_drop(dentry);
- }
- if (!try_aopen)
- aufs_read_unlock(dentry, AuLock_DW);
-out_free:
- au_delayed_kfree(a);
-out:
- return err;
-}
-
-int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
- dev_t dev)
-{
- struct simple_arg arg = {
- .type = Mknod,
- .u.m = {
- .mode = mode,
- .dev = dev
- }
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
-{
- struct simple_arg arg = {
- .type = Symlink,
- .u.s.symname = symname
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool want_excl)
-{
- struct simple_arg arg = {
- .type = Creat,
- .u.c = {
- .mode = mode,
- .want_excl = want_excl
- }
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int au_aopen_or_create(struct inode *dir, struct dentry *dentry,
- struct vfsub_aopen_args *aopen_args)
-{
- struct simple_arg arg = {
- .type = Creat,
- .u.c = {
- .mode = aopen_args->create_mode,
- .want_excl = aopen_args->open_flag & O_EXCL,
- .try_aopen = true,
- .aopen = aopen_args
- }
- };
- return add_simple(dir, dentry, &arg);
-}
-
-int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
-{
- int err;
- aufs_bindex_t bindex;
- struct super_block *sb;
- struct dentry *parent, *h_parent, *h_dentry;
- struct inode *h_dir, *inode;
- struct vfsmount *h_mnt;
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = AuWrDir_TMPFILE
- };
-
- /* copy-up may happen */
- inode_lock(dir);
-
- sb = dir->i_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out;
-
- err = au_di_init(dentry);
- if (unlikely(err))
- goto out_si;
-
- err = -EBUSY;
- parent = d_find_any_alias(dir);
- AuDebugOn(!parent);
- di_write_lock_parent(parent);
- if (unlikely(d_inode(parent) != dir))
- goto out_parent;
-
- err = au_digen_test(parent, au_sigen(sb));
- if (unlikely(err))
- goto out_parent;
-
- bindex = au_dbtop(parent);
- au_set_dbtop(dentry, bindex);
- au_set_dbbot(dentry, bindex);
- err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
- bindex = err;
- if (unlikely(err < 0))
- goto out_parent;
-
- err = -EOPNOTSUPP;
- h_dir = au_h_iptr(dir, bindex);
- if (unlikely(!h_dir->i_op->tmpfile))
- goto out_parent;
-
- h_mnt = au_sbr_mnt(sb, bindex);
- err = vfsub_mnt_want_write(h_mnt);
- if (unlikely(err))
- goto out_parent;
-
- h_parent = au_h_dptr(parent, bindex);
- err = inode_permission(d_inode(h_parent), MAY_WRITE | MAY_EXEC);
- if (unlikely(err))
- goto out_mnt;
-
- err = -ENOMEM;
- h_dentry = d_alloc(h_parent, &dentry->d_name);
- if (unlikely(!h_dentry))
- goto out_mnt;
-
- err = h_dir->i_op->tmpfile(h_dir, h_dentry, mode);
- if (unlikely(err))
- goto out_dentry;
-
- au_set_dbtop(dentry, bindex);
- au_set_dbbot(dentry, bindex);
- au_set_h_dptr(dentry, bindex, dget(h_dentry));
- inode = au_new_inode(dentry, /*must_new*/1);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- au_set_h_dptr(dentry, bindex, NULL);
- au_set_dbtop(dentry, -1);
- au_set_dbbot(dentry, -1);
- } else {
- if (!inode->i_nlink)
- set_nlink(inode, 1);
- d_tmpfile(dentry, inode);
- au_di(dentry)->di_tmpfile = 1;
-
- /* update without i_mutex */
- if (au_ibtop(dir) == au_dbtop(dentry))
- au_cpup_attr_timesizes(dir);
- }
-
-out_dentry:
- dput(h_dentry);
-out_mnt:
- vfsub_mnt_drop_write(h_mnt);
-out_parent:
- di_write_unlock(parent);
- dput(parent);
- di_write_unlock(dentry);
- if (unlikely(err)) {
- au_di_fin(dentry);
- dentry->d_fsdata = NULL;
- }
-out_si:
- si_read_unlock(sb);
-out:
- inode_unlock(dir);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_link_args {
- aufs_bindex_t bdst, bsrc;
- struct au_pin pin;
- struct path h_path;
- struct dentry *src_parent, *parent;
-};
-
-static int au_cpup_before_link(struct dentry *src_dentry,
- struct au_link_args *a)
-{
- int err;
- struct dentry *h_src_dentry;
- struct au_cp_generic cpg = {
- .dentry = src_dentry,
- .bdst = a->bdst,
- .bsrc = a->bsrc,
- .len = -1,
- .pin = &a->pin,
- .flags = AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */
- };
-
- di_read_lock_parent(a->src_parent, AuLock_IR);
- err = au_test_and_cpup_dirs(src_dentry, a->bdst);
- if (unlikely(err))
- goto out;
-
- h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
- err = au_pin(&a->pin, src_dentry, a->bdst,
- au_opt_udba(src_dentry->d_sb),
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out;
-
- err = au_sio_cpup_simple(&cpg);
- au_unpin(&a->pin);
-
-out:
- di_read_unlock(a->src_parent, AuLock_IR);
- return err;
-}
-
-static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry,
- struct au_link_args *a)
-{
- int err;
- unsigned char plink;
- aufs_bindex_t bbot;
- struct dentry *h_src_dentry;
- struct inode *h_inode, *inode, *delegated;
- struct super_block *sb;
- struct file *h_file;
-
- plink = 0;
- h_inode = NULL;
- sb = src_dentry->d_sb;
- inode = d_inode(src_dentry);
- if (au_ibtop(inode) <= a->bdst)
- h_inode = au_h_iptr(inode, a->bdst);
- if (!h_inode || !h_inode->i_nlink) {
- /* copyup src_dentry as the name of dentry. */
- bbot = au_dbbot(dentry);
- if (bbot < a->bsrc)
- au_set_dbbot(dentry, a->bsrc);
- au_set_h_dptr(dentry, a->bsrc,
- dget(au_h_dptr(src_dentry, a->bsrc)));
- dget(a->h_path.dentry);
- au_set_h_dptr(dentry, a->bdst, NULL);
- AuDbg("temporary d_inode...\n");
- spin_lock(&dentry->d_lock);
- dentry->d_inode = d_inode(src_dentry); /* tmp */
- spin_unlock(&dentry->d_lock);
- h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0);
- if (IS_ERR(h_file))
- err = PTR_ERR(h_file);
- else {
- struct au_cp_generic cpg = {
- .dentry = dentry,
- .bdst = a->bdst,
- .bsrc = -1,
- .len = -1,
- .pin = &a->pin,
- .flags = AuCpup_KEEPLINO
- };
- err = au_sio_cpup_simple(&cpg);
- au_h_open_post(dentry, a->bsrc, h_file);
- if (!err) {
- dput(a->h_path.dentry);
- a->h_path.dentry = au_h_dptr(dentry, a->bdst);
- } else
- au_set_h_dptr(dentry, a->bdst,
- a->h_path.dentry);
- }
- spin_lock(&dentry->d_lock);
- dentry->d_inode = NULL; /* restore */
- spin_unlock(&dentry->d_lock);
- AuDbg("temporary d_inode...done\n");
- au_set_h_dptr(dentry, a->bsrc, NULL);
- au_set_dbbot(dentry, bbot);
- } else {
- /* the inode of src_dentry already exists on a.bdst branch */
- h_src_dentry = d_find_alias(h_inode);
- if (!h_src_dentry && au_plink_test(inode)) {
- plink = 1;
- h_src_dentry = au_plink_lkup(inode, a->bdst);
- err = PTR_ERR(h_src_dentry);
- if (IS_ERR(h_src_dentry))
- goto out;
-
- if (unlikely(d_is_negative(h_src_dentry))) {
- dput(h_src_dentry);
- h_src_dentry = NULL;
- }
-
- }
- if (h_src_dentry) {
- delegated = NULL;
- err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
- &a->h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- dput(h_src_dentry);
- } else {
- AuIOErr("no dentry found for hi%lu on b%d\n",
- h_inode->i_ino, a->bdst);
- err = -EIO;
- }
- }
-
- if (!err && !plink)
- au_plink_append(inode, a->bdst, a->h_path.dentry);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-int aufs_link(struct dentry *src_dentry, struct inode *dir,
- struct dentry *dentry)
-{
- int err, rerr;
- struct au_dtime dt;
- struct au_link_args *a;
- struct dentry *wh_dentry, *h_src_dentry;
- struct inode *inode, *delegated;
- struct super_block *sb;
- struct au_wr_dir_args wr_dir_args = {
- /* .force_btgt = -1, */
- .flags = AuWrDir_ADD_ENTRY
- };
-
- IMustLock(dir);
- inode = d_inode(src_dentry);
- IMustLock(inode);
-
- err = -ENOMEM;
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- a->parent = dentry->d_parent; /* dir inode is locked */
- err = aufs_read_and_write_lock2(dentry, src_dentry,
- AuLock_NOPLM | AuLock_GEN);
- if (unlikely(err))
- goto out_kfree;
- err = au_d_linkable(src_dentry);
- if (unlikely(err))
- goto out_unlock;
- err = au_d_may_add(dentry);
- if (unlikely(err))
- goto out_unlock;
-
- a->src_parent = dget_parent(src_dentry);
- wr_dir_args.force_btgt = au_ibtop(inode);
-
- di_write_lock_parent(a->parent);
- wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
- wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
- &wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_parent;
-
- err = 0;
- sb = dentry->d_sb;
- a->bdst = au_dbtop(dentry);
- a->h_path.dentry = au_h_dptr(dentry, a->bdst);
- a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
- a->bsrc = au_ibtop(inode);
- h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
- if (!h_src_dentry && au_di(src_dentry)->di_tmpfile)
- h_src_dentry = dget(au_hi_wh(inode, a->bsrc));
- if (!h_src_dentry) {
- a->bsrc = au_dbtop(src_dentry);
- h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
- AuDebugOn(!h_src_dentry);
- } else if (IS_ERR(h_src_dentry)) {
- err = PTR_ERR(h_src_dentry);
- goto out_parent;
- }
-
- if (au_opt_test(au_mntflags(sb), PLINK)) {
- if (a->bdst < a->bsrc
- /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
- err = au_cpup_or_link(src_dentry, dentry, a);
- else {
- delegated = NULL;
- err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
- &a->h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- }
- dput(h_src_dentry);
- } else {
- /*
- * copyup src_dentry to the branch we process,
- * and then link(2) to it.
- */
- dput(h_src_dentry);
- if (a->bdst < a->bsrc
- /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
- au_unpin(&a->pin);
- di_write_unlock(a->parent);
- err = au_cpup_before_link(src_dentry, a);
- di_write_lock_parent(a->parent);
- if (!err)
- err = au_pin(&a->pin, dentry, a->bdst,
- au_opt_udba(sb),
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (unlikely(err))
- goto out_wh;
- }
- if (!err) {
- h_src_dentry = au_h_dptr(src_dentry, a->bdst);
- err = -ENOENT;
- if (h_src_dentry && d_is_positive(h_src_dentry)) {
- delegated = NULL;
- err = vfsub_link(h_src_dentry,
- au_pinned_h_dir(&a->pin),
- &a->h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry"
- " for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- }
- }
- }
- if (unlikely(err))
- goto out_unpin;
-
- if (wh_dentry) {
- a->h_path.dentry = wh_dentry;
- err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
- dentry);
- if (unlikely(err))
- goto out_revert;
- }
-
- au_dir_ts(dir, a->bdst);
- dir->i_version++;
- inc_nlink(inode);
- inode->i_ctime = dir->i_ctime;
- d_instantiate(dentry, au_igrab(inode));
- if (d_unhashed(a->h_path.dentry))
- /* some filesystem calls d_drop() */
- d_drop(dentry);
- /* some filesystems consume an inode even hardlink */
- au_fhsm_wrote(sb, a->bdst, /*force*/0);
- goto out_unpin; /* success */
-
-out_revert:
- /* no delegation since it is just created */
- rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path,
- /*delegated*/NULL, /*force*/0);
- if (unlikely(rerr)) {
- AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr);
- err = -EIO;
- }
- au_dtime_revert(&dt);
-out_unpin:
- au_unpin(&a->pin);
-out_wh:
- dput(wh_dentry);
-out_parent:
- di_write_unlock(a->parent);
- dput(a->src_parent);
-out_unlock:
- if (unlikely(err)) {
- au_update_dbtop(dentry);
- d_drop(dentry);
- }
- aufs_read_and_write_unlock2(dentry, src_dentry);
-out_kfree:
- au_delayed_kfree(a);
-out:
- AuTraceErr(err);
- return err;
-}
-
-int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
-{
- int err, rerr;
- aufs_bindex_t bindex;
- unsigned char diropq;
- struct path h_path;
- struct dentry *wh_dentry, *parent, *opq_dentry;
- struct inode *h_inode;
- struct super_block *sb;
- struct {
- struct au_pin pin;
- struct au_dtime dt;
- } *a; /* reduce the stack usage */
- struct au_wr_dir_args wr_dir_args = {
- .force_btgt = -1,
- .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
- };
-
- IMustLock(dir);
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
- if (unlikely(err))
- goto out_free;
- err = au_d_may_add(dentry);
- if (unlikely(err))
- goto out_unlock;
-
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
- wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
- &a->pin, &wr_dir_args);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_parent;
-
- sb = dentry->d_sb;
- bindex = au_dbtop(dentry);
- h_path.dentry = au_h_dptr(dentry, bindex);
- h_path.mnt = au_sbr_mnt(sb, bindex);
- err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
- if (unlikely(err))
- goto out_unpin;
-
- /* make the dir opaque */
- diropq = 0;
- h_inode = d_inode(h_path.dentry);
- if (wh_dentry
- || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- opq_dentry = au_diropq_create(dentry, bindex);
- inode_unlock(h_inode);
- err = PTR_ERR(opq_dentry);
- if (IS_ERR(opq_dentry))
- goto out_dir;
- dput(opq_dentry);
- diropq = 1;
- }
-
- err = epilog(dir, bindex, wh_dentry, dentry);
- if (!err) {
- inc_nlink(dir);
- goto out_unpin; /* success */
- }
-
- /* revert */
- if (diropq) {
- AuLabel(revert opq);
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- rerr = au_diropq_remove(dentry, bindex);
- inode_unlock(h_inode);
- if (rerr) {
- AuIOErr("%pd reverting diropq failed(%d, %d)\n",
- dentry, err, rerr);
- err = -EIO;
- }
- }
-
-out_dir:
- AuLabel(revert dir);
- rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
- if (rerr) {
- AuIOErr("%pd reverting dir failed(%d, %d)\n",
- dentry, err, rerr);
- err = -EIO;
- }
- au_dtime_revert(&a->dt);
-out_unpin:
- au_unpin(&a->pin);
- dput(wh_dentry);
-out_parent:
- di_write_unlock(parent);
-out_unlock:
- if (unlikely(err)) {
- au_update_dbtop(dentry);
- d_drop(dentry);
- }
- aufs_read_unlock(dentry, AuLock_DW);
-out_free:
- au_delayed_kfree(a);
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode operations (del entry)
- */
-
-#include "aufs.h"
-
-/*
- * decide if a new whiteout for @dentry is necessary or not.
- * when it is necessary, prepare the parent dir for the upper branch whose
- * branch index is @bcpup for creation. the actual creation of the whiteout will
- * be done by caller.
- * return value:
- * 0: wh is unnecessary
- * plus: wh is necessary
- * minus: error
- */
-int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup)
-{
- int need_wh, err;
- aufs_bindex_t btop;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- btop = au_dbtop(dentry);
- if (*bcpup < 0) {
- *bcpup = btop;
- if (au_test_ro(sb, btop, d_inode(dentry))) {
- err = AuWbrCopyup(au_sbi(sb), dentry);
- *bcpup = err;
- if (unlikely(err < 0))
- goto out;
- }
- } else
- AuDebugOn(btop < *bcpup
- || au_test_ro(sb, *bcpup, d_inode(dentry)));
- AuDbg("bcpup %d, btop %d\n", *bcpup, btop);
-
- if (*bcpup != btop) {
- err = au_cpup_dirs(dentry, *bcpup);
- if (unlikely(err))
- goto out;
- need_wh = 1;
- } else {
- struct au_dinfo *dinfo, *tmp;
-
- need_wh = -ENOMEM;
- dinfo = au_di(dentry);
- tmp = au_di_alloc(sb, AuLsc_DI_TMP);
- if (tmp) {
- au_di_cp(tmp, dinfo);
- au_di_swap(tmp, dinfo);
- /* returns the number of positive dentries */
- need_wh = au_lkup_dentry(dentry, btop + 1,
- /* AuLkup_IGNORE_PERM */ 0);
- au_di_swap(tmp, dinfo);
- au_rw_write_unlock(&tmp->di_rwsem);
- au_di_free(tmp);
- }
- }
- AuDbg("need_wh %d\n", need_wh);
- err = need_wh;
-
-out:
- return err;
-}
-
-/*
- * simple tests for the del-entry operations.
- * following the checks in vfs, plus the parent-child relationship.
- */
-int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir)
-{
- int err;
- umode_t h_mode;
- struct dentry *h_dentry, *h_latest;
- struct inode *h_inode;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (d_really_is_positive(dentry)) {
- err = -ENOENT;
- if (unlikely(d_is_negative(h_dentry)))
- goto out;
- h_inode = d_inode(h_dentry);
- if (unlikely(!h_inode->i_nlink))
- goto out;
-
- h_mode = h_inode->i_mode;
- if (!isdir) {
- err = -EISDIR;
- if (unlikely(S_ISDIR(h_mode)))
- goto out;
- } else if (unlikely(!S_ISDIR(h_mode))) {
- err = -ENOTDIR;
- goto out;
- }
- } else {
- /* rename(2) case */
- err = -EIO;
- if (unlikely(d_is_positive(h_dentry)))
- goto out;
- }
-
- err = -ENOENT;
- /* expected parent dir is locked */
- if (unlikely(h_parent != h_dentry->d_parent))
- goto out;
- err = 0;
-
- /*
- * rmdir a dir may break the consistency on some filesystem.
- * let's try heavy test.
- */
- err = -EACCES;
- if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1)
- && au_test_h_perm(d_inode(h_parent),
- MAY_EXEC | MAY_WRITE)))
- goto out;
-
- h_latest = au_sio_lkup_one(&dentry->d_name, h_parent);
- err = -EIO;
- if (IS_ERR(h_latest))
- goto out;
- if (h_latest == h_dentry)
- err = 0;
- dput(h_latest);
-
-out:
- return err;
-}
-
-/*
- * decide the branch where we operate for @dentry. the branch index will be set
- * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent
- * dir for reverting.
- * when a new whiteout is necessary, create it.
- */
-static struct dentry*
-lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup,
- struct au_dtime *dt, struct au_pin *pin)
-{
- struct dentry *wh_dentry;
- struct super_block *sb;
- struct path h_path;
- int err, need_wh;
- unsigned int udba;
- aufs_bindex_t bcpup;
-
- need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup);
- wh_dentry = ERR_PTR(need_wh);
- if (unlikely(need_wh < 0))
- goto out;
-
- sb = dentry->d_sb;
- udba = au_opt_udba(sb);
- bcpup = *rbcpup;
- err = au_pin(pin, dentry, bcpup, udba,
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- h_path.dentry = au_pinned_h_parent(pin);
- if (udba != AuOpt_UDBA_NONE
- && au_dbtop(dentry) == bcpup) {
- err = au_may_del(dentry, bcpup, h_path.dentry, isdir);
- wh_dentry = ERR_PTR(err);
- if (unlikely(err))
- goto out_unpin;
- }
-
- h_path.mnt = au_sbr_mnt(sb, bcpup);
- au_dtime_store(dt, au_pinned_parent(pin), &h_path);
- wh_dentry = NULL;
- if (!need_wh)
- goto out; /* success, no need to create whiteout */
-
- wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry);
- if (IS_ERR(wh_dentry))
- goto out_unpin;
-
- /* returns with the parent is locked and wh_dentry is dget-ed */
- goto out; /* success */
-
-out_unpin:
- au_unpin(pin);
-out:
- return wh_dentry;
-}
-
-/*
- * when removing a dir, rename it to a unique temporary whiteout-ed name first
- * in order to be revertible and save time for removing many child whiteouts
- * under the dir.
- * returns 1 when there are too many child whiteout and caller should remove
- * them asynchronously. returns 0 when the number of children is enough small to
- * remove now or the branch fs is a remote fs.
- * otherwise return an error.
- */
-static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
- struct au_nhash *whlist, struct inode *dir)
-{
- int rmdir_later, err, dirwh;
- struct dentry *h_dentry;
- struct super_block *sb;
- struct inode *inode;
-
- sb = dentry->d_sb;
- SiMustAnyLock(sb);
- h_dentry = au_h_dptr(dentry, bindex);
- err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
- if (unlikely(err))
- goto out;
-
- /* stop monitoring */
- inode = d_inode(dentry);
- au_hn_free(au_hi(inode, bindex));
-
- if (!au_test_fs_remote(h_dentry->d_sb)) {
- dirwh = au_sbi(sb)->si_dirwh;
- rmdir_later = (dirwh <= 1);
- if (!rmdir_later)
- rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
- dirwh);
- if (rmdir_later)
- return rmdir_later;
- }
-
- err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
- if (unlikely(err)) {
- AuIOErr("rmdir %pd, b%d failed, %d. ignored\n",
- h_dentry, bindex, err);
- err = 0;
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/*
- * final procedure for deleting a entry.
- * maintain dentry and iattr.
- */
-static void epilog(struct inode *dir, struct dentry *dentry,
- aufs_bindex_t bindex)
-{
- struct inode *inode;
-
- inode = d_inode(dentry);
- d_drop(dentry);
- inode->i_ctime = dir->i_ctime;
-
- au_dir_ts(dir, bindex);
- dir->i_version++;
-}
-
-/*
- * when an error happened, remove the created whiteout and revert everything.
- */
-static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
- aufs_bindex_t bwh, struct dentry *wh_dentry,
- struct dentry *dentry, struct au_dtime *dt)
-{
- int rerr;
- struct path h_path = {
- .dentry = wh_dentry,
- .mnt = au_sbr_mnt(dir->i_sb, bindex)
- };
-
- rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
- if (!rerr) {
- au_set_dbwh(dentry, bwh);
- au_dtime_revert(dt);
- return 0;
- }
-
- AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr);
- return -EIO;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int aufs_unlink(struct inode *dir, struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bwh, bindex, btop;
- struct inode *inode, *h_dir, *delegated;
- struct dentry *parent, *wh_dentry;
- /* to reuduce stack size */
- struct {
- struct au_dtime dt;
- struct au_pin pin;
- struct path h_path;
- } *a;
-
- IMustLock(dir);
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
- if (unlikely(err))
- goto out_free;
- err = au_d_hashed_positive(dentry);
- if (unlikely(err))
- goto out_unlock;
- inode = d_inode(dentry);
- IMustLock(inode);
- err = -EISDIR;
- if (unlikely(d_is_dir(dentry)))
- goto out_unlock; /* possible? */
-
- btop = au_dbtop(dentry);
- bwh = au_dbwh(dentry);
- bindex = -1;
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
- wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt,
- &a->pin);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_parent;
-
- a->h_path.mnt = au_sbr_mnt(dentry->d_sb, btop);
- a->h_path.dentry = au_h_dptr(dentry, btop);
- dget(a->h_path.dentry);
- if (bindex == btop) {
- h_dir = au_pinned_h_dir(&a->pin);
- delegated = NULL;
- err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- } else {
- /* dir inode is locked */
- h_dir = d_inode(wh_dentry->d_parent);
- IMustLock(h_dir);
- err = 0;
- }
-
- if (!err) {
- vfsub_drop_nlink(inode);
- epilog(dir, dentry, bindex);
-
- /* update target timestamps */
- if (bindex == btop) {
- vfsub_update_h_iattr(&a->h_path, /*did*/NULL);
- /*ignore*/
- inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime;
- } else
- /* todo: this timestamp may be reverted later */
- inode->i_ctime = h_dir->i_ctime;
- goto out_unpin; /* success */
- }
-
- /* revert */
- if (wh_dentry) {
- int rerr;
-
- rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry,
- &a->dt);
- if (rerr)
- err = rerr;
- }
-
-out_unpin:
- au_unpin(&a->pin);
- dput(wh_dentry);
- dput(a->h_path.dentry);
-out_parent:
- di_write_unlock(parent);
-out_unlock:
- aufs_read_unlock(dentry, AuLock_DW);
-out_free:
- au_delayed_kfree(a);
-out:
- return err;
-}
-
-int aufs_rmdir(struct inode *dir, struct dentry *dentry)
-{
- int err, rmdir_later;
- aufs_bindex_t bwh, bindex, btop;
- struct inode *inode;
- struct dentry *parent, *wh_dentry, *h_dentry;
- struct au_whtmp_rmdir *args;
- /* to reuduce stack size */
- struct {
- struct au_dtime dt;
- struct au_pin pin;
- } *a;
-
- IMustLock(dir);
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
- if (unlikely(err))
- goto out_free;
- err = au_alive_dir(dentry);
- if (unlikely(err))
- goto out_unlock;
- inode = d_inode(dentry);
- IMustLock(inode);
- err = -ENOTDIR;
- if (unlikely(!d_is_dir(dentry)))
- goto out_unlock; /* possible? */
-
- err = -ENOMEM;
- args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
- if (unlikely(!args))
- goto out_unlock;
-
- parent = dentry->d_parent; /* dir inode is locked */
- di_write_lock_parent(parent);
- err = au_test_empty(dentry, &args->whlist);
- if (unlikely(err))
- goto out_parent;
-
- btop = au_dbtop(dentry);
- bwh = au_dbwh(dentry);
- bindex = -1;
- wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &a->dt,
- &a->pin);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry))
- goto out_parent;
-
- h_dentry = au_h_dptr(dentry, btop);
- dget(h_dentry);
- rmdir_later = 0;
- if (bindex == btop) {
- err = renwh_and_rmdir(dentry, btop, &args->whlist, dir);
- if (err > 0) {
- rmdir_later = err;
- err = 0;
- }
- } else {
- /* stop monitoring */
- au_hn_free(au_hi(inode, btop));
-
- /* dir inode is locked */
- IMustLock(d_inode(wh_dentry->d_parent));
- err = 0;
- }
-
- if (!err) {
- vfsub_dead_dir(inode);
- au_set_dbdiropq(dentry, -1);
- epilog(dir, dentry, bindex);
-
- if (rmdir_later) {
- au_whtmp_kick_rmdir(dir, btop, h_dentry, args);
- args = NULL;
- }
-
- goto out_unpin; /* success */
- }
-
- /* revert */
- AuLabel(revert);
- if (wh_dentry) {
- int rerr;
-
- rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry,
- &a->dt);
- if (rerr)
- err = rerr;
- }
-
-out_unpin:
- au_unpin(&a->pin);
- dput(wh_dentry);
- dput(h_dentry);
-out_parent:
- di_write_unlock(parent);
- if (args)
- au_whtmp_rmdir_free(args);
-out_unlock:
- aufs_read_unlock(dentry, AuLock_DW);
-out_free:
- au_delayed_kfree(a);
-out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode operation (rename entry)
- * todo: this is crazy monster
- */
-
-#include "aufs.h"
-
-enum { AuSRC, AuDST, AuSrcDst };
-enum { AuPARENT, AuCHILD, AuParentChild };
-
-#define AuRen_ISDIR 1
-#define AuRen_ISSAMEDIR (1 << 1)
-#define AuRen_WHSRC (1 << 2)
-#define AuRen_WHDST (1 << 3)
-#define AuRen_MNT_WRITE (1 << 4)
-#define AuRen_DT_DSTDIR (1 << 5)
-#define AuRen_DIROPQ (1 << 6)
-#define au_ftest_ren(flags, name) ((flags) & AuRen_##name)
-#define au_fset_ren(flags, name) \
- do { (flags) |= AuRen_##name; } while (0)
-#define au_fclr_ren(flags, name) \
- do { (flags) &= ~AuRen_##name; } while (0)
-
-struct au_ren_args {
- struct {
- struct dentry *dentry, *h_dentry, *parent, *h_parent,
- *wh_dentry;
- struct inode *dir, *inode;
- struct au_hinode *hdir;
- struct au_dtime dt[AuParentChild];
- aufs_bindex_t btop;
- } sd[AuSrcDst];
-
-#define src_dentry sd[AuSRC].dentry
-#define src_dir sd[AuSRC].dir
-#define src_inode sd[AuSRC].inode
-#define src_h_dentry sd[AuSRC].h_dentry
-#define src_parent sd[AuSRC].parent
-#define src_h_parent sd[AuSRC].h_parent
-#define src_wh_dentry sd[AuSRC].wh_dentry
-#define src_hdir sd[AuSRC].hdir
-#define src_h_dir sd[AuSRC].hdir->hi_inode
-#define src_dt sd[AuSRC].dt
-#define src_btop sd[AuSRC].btop
-
-#define dst_dentry sd[AuDST].dentry
-#define dst_dir sd[AuDST].dir
-#define dst_inode sd[AuDST].inode
-#define dst_h_dentry sd[AuDST].h_dentry
-#define dst_parent sd[AuDST].parent
-#define dst_h_parent sd[AuDST].h_parent
-#define dst_wh_dentry sd[AuDST].wh_dentry
-#define dst_hdir sd[AuDST].hdir
-#define dst_h_dir sd[AuDST].hdir->hi_inode
-#define dst_dt sd[AuDST].dt
-#define dst_btop sd[AuDST].btop
-
- struct dentry *h_trap;
- struct au_branch *br;
- struct au_hinode *src_hinode;
- struct path h_path;
- struct au_nhash whlist;
- aufs_bindex_t btgt, src_bwh, src_bdiropq;
-
- unsigned int flags;
-
- struct au_whtmp_rmdir *thargs;
- struct dentry *h_dst;
-};
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * functions for reverting.
- * when an error happened in a single rename systemcall, we should revert
- * everything as if nothing happened.
- * we don't need to revert the copied-up/down the parent dir since they are
- * harmless.
- */
-
-#define RevertFailure(fmt, ...) do { \
- AuIOErr("revert failure: " fmt " (%d, %d)\n", \
- ##__VA_ARGS__, err, rerr); \
- err = -EIO; \
-} while (0)
-
-static void au_ren_rev_diropq(int err, struct au_ren_args *a)
-{
- int rerr;
-
- au_hn_inode_lock_nested(a->src_hinode, AuLsc_I_CHILD);
- rerr = au_diropq_remove(a->src_dentry, a->btgt);
- au_hn_inode_unlock(a->src_hinode);
- au_set_dbdiropq(a->src_dentry, a->src_bdiropq);
- if (rerr)
- RevertFailure("remove diropq %pd", a->src_dentry);
-}
-
-static void au_ren_rev_rename(int err, struct au_ren_args *a)
-{
- int rerr;
- struct inode *delegated;
-
- a->h_path.dentry = vfsub_lkup_one(&a->src_dentry->d_name,
- a->src_h_parent);
- rerr = PTR_ERR(a->h_path.dentry);
- if (IS_ERR(a->h_path.dentry)) {
- RevertFailure("lkup one %pd", a->src_dentry);
- return;
- }
-
- delegated = NULL;
- rerr = vfsub_rename(a->dst_h_dir,
- au_h_dptr(a->src_dentry, a->btgt),
- a->src_h_dir, &a->h_path, &delegated);
- if (unlikely(rerr == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal rename\n");
- iput(delegated);
- }
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */
- if (rerr)
- RevertFailure("rename %pd", a->src_dentry);
-}
-
-static void au_ren_rev_whtmp(int err, struct au_ren_args *a)
-{
- int rerr;
- struct inode *delegated;
-
- a->h_path.dentry = vfsub_lkup_one(&a->dst_dentry->d_name,
- a->dst_h_parent);
- rerr = PTR_ERR(a->h_path.dentry);
- if (IS_ERR(a->h_path.dentry)) {
- RevertFailure("lkup one %pd", a->dst_dentry);
- return;
- }
- if (d_is_positive(a->h_path.dentry)) {
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- return;
- }
-
- delegated = NULL;
- rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path,
- &delegated);
- if (unlikely(rerr == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal rename\n");
- iput(delegated);
- }
- d_drop(a->h_path.dentry);
- dput(a->h_path.dentry);
- if (!rerr)
- au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst));
- else
- RevertFailure("rename %pd", a->h_dst);
-}
-
-static void au_ren_rev_whsrc(int err, struct au_ren_args *a)
-{
- int rerr;
-
- a->h_path.dentry = a->src_wh_dentry;
- rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry);
- au_set_dbwh(a->src_dentry, a->src_bwh);
- if (rerr)
- RevertFailure("unlink %pd", a->src_wh_dentry);
-}
-#undef RevertFailure
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * when we have to copyup the renaming entry, do it with the rename-target name
- * in order to minimize the cost (the later actual rename is unnecessary).
- * otherwise rename it on the target branch.
- */
-static int au_ren_or_cpup(struct au_ren_args *a)
-{
- int err;
- struct dentry *d;
- struct inode *delegated;
-
- d = a->src_dentry;
- if (au_dbtop(d) == a->btgt) {
- a->h_path.dentry = a->dst_h_dentry;
- if (au_ftest_ren(a->flags, DIROPQ)
- && au_dbdiropq(d) == a->btgt)
- au_fclr_ren(a->flags, DIROPQ);
- AuDebugOn(au_dbtop(d) != a->btgt);
- delegated = NULL;
- err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
- a->dst_h_dir, &a->h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal rename\n");
- iput(delegated);
- }
- } else
- BUG();
-
- if (!err && a->h_dst)
- /* it will be set to dinfo later */
- dget(a->h_dst);
-
- return err;
-}
-
-/* cf. aufs_rmdir() */
-static int au_ren_del_whtmp(struct au_ren_args *a)
-{
- int err;
- struct inode *dir;
-
- dir = a->dst_dir;
- SiMustAnyLock(dir->i_sb);
- if (!au_nhash_test_longer_wh(&a->whlist, a->btgt,
- au_sbi(dir->i_sb)->si_dirwh)
- || au_test_fs_remote(a->h_dst->d_sb)) {
- err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist);
- if (unlikely(err))
- pr_warn("failed removing whtmp dir %pd (%d), "
- "ignored.\n", a->h_dst, err);
- } else {
- au_nhash_wh_free(&a->thargs->whlist);
- a->thargs->whlist = a->whlist;
- a->whlist.nh_num = 0;
- au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs);
- dput(a->h_dst);
- a->thargs = NULL;
- }
-
- return 0;
-}
-
-/* make it 'opaque' dir. */
-static int au_ren_diropq(struct au_ren_args *a)
-{
- int err;
- struct dentry *diropq;
-
- err = 0;
- a->src_bdiropq = au_dbdiropq(a->src_dentry);
- a->src_hinode = au_hi(a->src_inode, a->btgt);
- au_hn_inode_lock_nested(a->src_hinode, AuLsc_I_CHILD);
- diropq = au_diropq_create(a->src_dentry, a->btgt);
- au_hn_inode_unlock(a->src_hinode);
- if (IS_ERR(diropq))
- err = PTR_ERR(diropq);
- else
- dput(diropq);
-
- return err;
-}
-
-static int do_rename(struct au_ren_args *a)
-{
- int err;
- struct dentry *d, *h_d;
-
- /* prepare workqueue args for asynchronous rmdir */
- h_d = a->dst_h_dentry;
- if (au_ftest_ren(a->flags, ISDIR) && d_is_positive(h_d)) {
- err = -ENOMEM;
- a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
- if (unlikely(!a->thargs))
- goto out;
- a->h_dst = dget(h_d);
- }
-
- /* create whiteout for src_dentry */
- if (au_ftest_ren(a->flags, WHSRC)) {
- a->src_bwh = au_dbwh(a->src_dentry);
- AuDebugOn(a->src_bwh >= 0);
- a->src_wh_dentry
- = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
- err = PTR_ERR(a->src_wh_dentry);
- if (IS_ERR(a->src_wh_dentry))
- goto out_thargs;
- }
-
- /* lookup whiteout for dentry */
- if (au_ftest_ren(a->flags, WHDST)) {
- h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
- a->br);
- err = PTR_ERR(h_d);
- if (IS_ERR(h_d))
- goto out_whsrc;
- if (d_is_negative(h_d))
- dput(h_d);
- else
- a->dst_wh_dentry = h_d;
- }
-
- /* rename dentry to tmpwh */
- if (a->thargs) {
- err = au_whtmp_ren(a->dst_h_dentry, a->br);
- if (unlikely(err))
- goto out_whdst;
-
- d = a->dst_dentry;
- au_set_h_dptr(d, a->btgt, NULL);
- err = au_lkup_neg(d, a->btgt, /*wh*/0);
- if (unlikely(err))
- goto out_whtmp;
- a->dst_h_dentry = au_h_dptr(d, a->btgt);
- }
-
- BUG_ON(d_is_positive(a->dst_h_dentry) && a->src_btop != a->btgt);
-
- /* rename by vfs_rename or cpup */
- d = a->dst_dentry;
- if (au_ftest_ren(a->flags, ISDIR)
- && (a->dst_wh_dentry
- || au_dbdiropq(d) == a->btgt
- /* hide the lower to keep xino */
- || a->btgt < au_dbbot(d)
- || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
- au_fset_ren(a->flags, DIROPQ);
- err = au_ren_or_cpup(a);
- if (unlikely(err))
- /* leave the copied-up one */
- goto out_whtmp;
-
- /* make dir opaque */
- if (au_ftest_ren(a->flags, DIROPQ)) {
- err = au_ren_diropq(a);
- if (unlikely(err))
- goto out_rename;
- }
-
- /* update target timestamps */
- AuDebugOn(au_dbtop(a->src_dentry) != a->btgt);
- a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
- vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
- a->src_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime;
-
- /* remove whiteout for dentry */
- if (a->dst_wh_dentry) {
- a->h_path.dentry = a->dst_wh_dentry;
- err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
- a->dst_dentry);
- if (unlikely(err))
- goto out_diropq;
- }
-
- /* remove whtmp */
- if (a->thargs)
- au_ren_del_whtmp(a); /* ignore this error */
-
- au_fhsm_wrote(a->src_dentry->d_sb, a->btgt, /*force*/0);
- err = 0;
- goto out_success;
-
-out_diropq:
- if (au_ftest_ren(a->flags, DIROPQ))
- au_ren_rev_diropq(err, a);
-out_rename:
- au_ren_rev_rename(err, a);
- dput(a->h_dst);
-out_whtmp:
- if (a->thargs)
- au_ren_rev_whtmp(err, a);
-out_whdst:
- dput(a->dst_wh_dentry);
- a->dst_wh_dentry = NULL;
-out_whsrc:
- if (a->src_wh_dentry)
- au_ren_rev_whsrc(err, a);
-out_success:
- dput(a->src_wh_dentry);
- dput(a->dst_wh_dentry);
-out_thargs:
- if (a->thargs) {
- dput(a->h_dst);
- au_whtmp_rmdir_free(a->thargs);
- a->thargs = NULL;
- }
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * test if @dentry dir can be rename destination or not.
- * success means, it is a logically empty dir.
- */
-static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist)
-{
- return au_test_empty(dentry, whlist);
-}
-
-/*
- * test if @dentry dir can be rename source or not.
- * if it can, return 0 and @children is filled.
- * success means,
- * - it is a logically empty dir.
- * - or, it exists on writable branch and has no children including whiteouts
- * on the lower branch.
- */
-static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
-{
- int err;
- unsigned int rdhash;
- aufs_bindex_t btop;
-
- btop = au_dbtop(dentry);
- if (btop != btgt) {
- struct au_nhash whlist;
-
- SiMustAnyLock(dentry->d_sb);
- rdhash = au_sbi(dentry->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL,
- dentry));
- err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_test_empty(dentry, &whlist);
- au_nhash_wh_free(&whlist);
- goto out;
- }
-
- if (btop == au_dbtaildir(dentry))
- return 0; /* success */
-
- err = au_test_empty_lower(dentry);
-
-out:
- if (err == -ENOTEMPTY) {
- AuWarn1("renaming dir who has child(ren) on multiple branches,"
- " is not supported\n");
- err = -EXDEV;
- }
- return err;
-}
-
-/* side effect: sets whlist and h_dentry */
-static int au_ren_may_dir(struct au_ren_args *a)
-{
- int err;
- unsigned int rdhash;
- struct dentry *d;
-
- d = a->dst_dentry;
- SiMustAnyLock(d->d_sb);
-
- err = 0;
- if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
- rdhash = au_sbi(d->d_sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
- err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
-
- au_set_dbtop(d, a->dst_btop);
- err = may_rename_dstdir(d, &a->whlist);
- au_set_dbtop(d, a->btgt);
- }
- a->dst_h_dentry = au_h_dptr(d, au_dbtop(d));
- if (unlikely(err))
- goto out;
-
- d = a->src_dentry;
- a->src_h_dentry = au_h_dptr(d, au_dbtop(d));
- if (au_ftest_ren(a->flags, ISDIR)) {
- err = may_rename_srcdir(d, a->btgt);
- if (unlikely(err)) {
- au_nhash_wh_free(&a->whlist);
- a->whlist.nh_num = 0;
- }
- }
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * simple tests for rename.
- * following the checks in vfs, plus the parent-child relationship.
- */
-static int au_may_ren(struct au_ren_args *a)
-{
- int err, isdir;
- struct inode *h_inode;
-
- if (a->src_btop == a->btgt) {
- err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent,
- au_ftest_ren(a->flags, ISDIR));
- if (unlikely(err))
- goto out;
- err = -EINVAL;
- if (unlikely(a->src_h_dentry == a->h_trap))
- goto out;
- }
-
- err = 0;
- if (a->dst_btop != a->btgt)
- goto out;
-
- err = -ENOTEMPTY;
- if (unlikely(a->dst_h_dentry == a->h_trap))
- goto out;
-
- err = -EIO;
- isdir = !!au_ftest_ren(a->flags, ISDIR);
- if (d_really_is_negative(a->dst_dentry)) {
- if (d_is_negative(a->dst_h_dentry))
- err = au_may_add(a->dst_dentry, a->btgt,
- a->dst_h_parent, isdir);
- } else {
- if (unlikely(d_is_negative(a->dst_h_dentry)))
- goto out;
- h_inode = d_inode(a->dst_h_dentry);
- if (h_inode->i_nlink)
- err = au_may_del(a->dst_dentry, a->btgt,
- a->dst_h_parent, isdir);
- }
-
-out:
- if (unlikely(err == -ENOENT || err == -EEXIST))
- err = -EIO;
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * locking order
- * (VFS)
- * - src_dir and dir by lock_rename()
- * - inode if exitsts
- * (aufs)
- * - lock all
- * + src_dentry and dentry by aufs_read_and_write_lock2() which calls,
- * + si_read_lock
- * + di_write_lock2_child()
- * + di_write_lock_child()
- * + ii_write_lock_child()
- * + di_write_lock_child2()
- * + ii_write_lock_child2()
- * + src_parent and parent
- * + di_write_lock_parent()
- * + ii_write_lock_parent()
- * + di_write_lock_parent2()
- * + ii_write_lock_parent2()
- * + lower src_dir and dir by vfsub_lock_rename()
- * + verify the every relationships between child and parent. if any
- * of them failed, unlock all and return -EBUSY.
- */
-static void au_ren_unlock(struct au_ren_args *a)
-{
- vfsub_unlock_rename(a->src_h_parent, a->src_hdir,
- a->dst_h_parent, a->dst_hdir);
- if (au_ftest_ren(a->flags, MNT_WRITE))
- vfsub_mnt_drop_write(au_br_mnt(a->br));
-}
-
-static int au_ren_lock(struct au_ren_args *a)
-{
- int err;
- unsigned int udba;
-
- err = 0;
- a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
- a->src_hdir = au_hi(a->src_dir, a->btgt);
- a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
- a->dst_hdir = au_hi(a->dst_dir, a->btgt);
-
- err = vfsub_mnt_want_write(au_br_mnt(a->br));
- if (unlikely(err))
- goto out;
- au_fset_ren(a->flags, MNT_WRITE);
- a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
- a->dst_h_parent, a->dst_hdir);
- udba = au_opt_udba(a->src_dentry->d_sb);
- if (unlikely(a->src_hdir->hi_inode != d_inode(a->src_h_parent)
- || a->dst_hdir->hi_inode != d_inode(a->dst_h_parent)))
- err = au_busy_or_stale();
- if (!err && au_dbtop(a->src_dentry) == a->btgt)
- err = au_h_verify(a->src_h_dentry, udba,
- d_inode(a->src_h_parent), a->src_h_parent,
- a->br);
- if (!err && au_dbtop(a->dst_dentry) == a->btgt)
- err = au_h_verify(a->dst_h_dentry, udba,
- d_inode(a->dst_h_parent), a->dst_h_parent,
- a->br);
- if (!err)
- goto out; /* success */
-
- err = au_busy_or_stale();
- au_ren_unlock(a);
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_ren_refresh_dir(struct au_ren_args *a)
-{
- struct inode *dir;
-
- dir = a->dst_dir;
- dir->i_version++;
- if (au_ftest_ren(a->flags, ISDIR)) {
- /* is this updating defined in POSIX? */
- au_cpup_attr_timesizes(a->src_inode);
- au_cpup_attr_nlink(dir, /*force*/1);
- }
-
- au_dir_ts(dir, a->btgt);
-
- if (au_ftest_ren(a->flags, ISSAMEDIR))
- return;
-
- dir = a->src_dir;
- dir->i_version++;
- if (au_ftest_ren(a->flags, ISDIR))
- au_cpup_attr_nlink(dir, /*force*/1);
- au_dir_ts(dir, a->btgt);
-}
-
-static void au_ren_refresh(struct au_ren_args *a)
-{
- aufs_bindex_t bbot, bindex;
- struct dentry *d, *h_d;
- struct inode *i, *h_i;
- struct super_block *sb;
-
- d = a->dst_dentry;
- d_drop(d);
- if (a->h_dst)
- /* already dget-ed by au_ren_or_cpup() */
- au_set_h_dptr(d, a->btgt, a->h_dst);
-
- i = a->dst_inode;
- if (i) {
- if (!au_ftest_ren(a->flags, ISDIR))
- vfsub_drop_nlink(i);
- else {
- vfsub_dead_dir(i);
- au_cpup_attr_timesizes(i);
- }
- au_update_dbrange(d, /*do_put_zero*/1);
- } else {
- bbot = a->btgt;
- for (bindex = au_dbtop(d); bindex < bbot; bindex++)
- au_set_h_dptr(d, bindex, NULL);
- bbot = au_dbbot(d);
- for (bindex = a->btgt + 1; bindex <= bbot; bindex++)
- au_set_h_dptr(d, bindex, NULL);
- au_update_dbrange(d, /*do_put_zero*/0);
- }
-
- d = a->src_dentry;
- au_set_dbwh(d, -1);
- bbot = au_dbbot(d);
- for (bindex = a->btgt + 1; bindex <= bbot; bindex++) {
- h_d = au_h_dptr(d, bindex);
- if (h_d)
- au_set_h_dptr(d, bindex, NULL);
- }
- au_set_dbbot(d, a->btgt);
-
- sb = d->d_sb;
- i = a->src_inode;
- if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
- return; /* success */
-
- bbot = au_ibbot(i);
- for (bindex = a->btgt + 1; bindex <= bbot; bindex++) {
- h_i = au_h_iptr(i, bindex);
- if (h_i) {
- au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
- /* ignore this error */
- au_set_h_iptr(i, bindex, NULL, 0);
- }
- }
- au_set_ibbot(i, a->btgt);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* mainly for link(2) and rename(2) */
-int au_wbr(struct dentry *dentry, aufs_bindex_t btgt)
-{
- aufs_bindex_t bdiropq, bwh;
- struct dentry *parent;
- struct au_branch *br;
-
- parent = dentry->d_parent;
- IMustLock(d_inode(parent)); /* dir is locked */
-
- bdiropq = au_dbdiropq(parent);
- bwh = au_dbwh(dentry);
- br = au_sbr(dentry->d_sb, btgt);
- if (au_br_rdonly(br)
- || (0 <= bdiropq && bdiropq < btgt)
- || (0 <= bwh && bwh < btgt))
- btgt = -1;
-
- AuDbg("btgt %d\n", btgt);
- return btgt;
-}
-
-/* sets src_btop, dst_btop and btgt */
-static int au_ren_wbr(struct au_ren_args *a)
-{
- int err;
- struct au_wr_dir_args wr_dir_args = {
- /* .force_btgt = -1, */
- .flags = AuWrDir_ADD_ENTRY
- };
-
- a->src_btop = au_dbtop(a->src_dentry);
- a->dst_btop = au_dbtop(a->dst_dentry);
- if (au_ftest_ren(a->flags, ISDIR))
- au_fset_wrdir(wr_dir_args.flags, ISDIR);
- wr_dir_args.force_btgt = a->src_btop;
- if (a->dst_inode && a->dst_btop < a->src_btop)
- wr_dir_args.force_btgt = a->dst_btop;
- wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt);
- err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args);
- a->btgt = err;
-
- return err;
-}
-
-static void au_ren_dt(struct au_ren_args *a)
-{
- a->h_path.dentry = a->src_h_parent;
- au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path);
- if (!au_ftest_ren(a->flags, ISSAMEDIR)) {
- a->h_path.dentry = a->dst_h_parent;
- au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path);
- }
-
- au_fclr_ren(a->flags, DT_DSTDIR);
- if (!au_ftest_ren(a->flags, ISDIR))
- return;
-
- a->h_path.dentry = a->src_h_dentry;
- au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path);
- if (d_is_positive(a->dst_h_dentry)) {
- au_fset_ren(a->flags, DT_DSTDIR);
- a->h_path.dentry = a->dst_h_dentry;
- au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path);
- }
-}
-
-static void au_ren_rev_dt(int err, struct au_ren_args *a)
-{
- struct dentry *h_d;
- struct inode *h_inode;
-
- au_dtime_revert(a->src_dt + AuPARENT);
- if (!au_ftest_ren(a->flags, ISSAMEDIR))
- au_dtime_revert(a->dst_dt + AuPARENT);
-
- if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) {
- h_d = a->src_dt[AuCHILD].dt_h_path.dentry;
- h_inode = d_inode(h_d);
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- au_dtime_revert(a->src_dt + AuCHILD);
- inode_unlock(h_inode);
-
- if (au_ftest_ren(a->flags, DT_DSTDIR)) {
- h_d = a->dst_dt[AuCHILD].dt_h_path.dentry;
- h_inode = d_inode(h_d);
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- au_dtime_revert(a->dst_dt + AuCHILD);
- inode_unlock(h_inode);
- }
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
- struct inode *_dst_dir, struct dentry *_dst_dentry)
-{
- int err, flags;
- /* reduce stack space */
- struct au_ren_args *a;
-
- AuDbg("%pd, %pd\n", _src_dentry, _dst_dentry);
- IMustLock(_src_dir);
- IMustLock(_dst_dir);
-
- err = -ENOMEM;
- BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
- a = kzalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- a->src_dir = _src_dir;
- a->src_dentry = _src_dentry;
- a->src_inode = NULL;
- if (d_really_is_positive(a->src_dentry))
- a->src_inode = d_inode(a->src_dentry);
- a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
- a->dst_dir = _dst_dir;
- a->dst_dentry = _dst_dentry;
- a->dst_inode = NULL;
- if (d_really_is_positive(a->dst_dentry))
- a->dst_inode = d_inode(a->dst_dentry);
- a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
- if (a->dst_inode) {
- IMustLock(a->dst_inode);
- au_igrab(a->dst_inode);
- }
-
- err = -ENOTDIR;
- flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN;
- if (d_is_dir(a->src_dentry)) {
- au_fset_ren(a->flags, ISDIR);
- if (unlikely(d_really_is_positive(a->dst_dentry)
- && !d_is_dir(a->dst_dentry)))
- goto out_free;
- flags |= AuLock_DIRS;
- }
- err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, flags);
- if (unlikely(err))
- goto out_free;
-
- err = au_d_hashed_positive(a->src_dentry);
- if (unlikely(err))
- goto out_unlock;
- err = -ENOENT;
- if (a->dst_inode) {
- /*
- * If it is a dir, VFS unhash dst_dentry before this
- * function. It means we cannot rely upon d_unhashed().
- */
- if (unlikely(!a->dst_inode->i_nlink))
- goto out_unlock;
- if (!S_ISDIR(a->dst_inode->i_mode)) {
- err = au_d_hashed_positive(a->dst_dentry);
- if (unlikely(err))
- goto out_unlock;
- } else if (unlikely(IS_DEADDIR(a->dst_inode)))
- goto out_unlock;
- } else if (unlikely(d_unhashed(a->dst_dentry)))
- goto out_unlock;
-
- /*
- * is it possible?
- * yes, it happened (in linux-3.3-rcN) but I don't know why.
- * there may exist a problem somewhere else.
- */
- err = -EINVAL;
- if (unlikely(d_inode(a->dst_parent) == d_inode(a->src_dentry)))
- goto out_unlock;
-
- au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
- di_write_lock_parent(a->dst_parent);
-
- /* which branch we process */
- err = au_ren_wbr(a);
- if (unlikely(err < 0))
- goto out_parent;
- a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
- a->h_path.mnt = au_br_mnt(a->br);
-
- /* are they available to be renamed */
- err = au_ren_may_dir(a);
- if (unlikely(err))
- goto out_children;
-
- /* prepare the writable parent dir on the same branch */
- if (a->dst_btop == a->btgt) {
- au_fset_ren(a->flags, WHDST);
- } else {
- err = au_cpup_dirs(a->dst_dentry, a->btgt);
- if (unlikely(err))
- goto out_children;
- }
-
- if (a->src_dir != a->dst_dir) {
- /*
- * this temporary unlock is safe,
- * because both dir->i_mutex are locked.
- */
- di_write_unlock(a->dst_parent);
- di_write_lock_parent(a->src_parent);
- err = au_wr_dir_need_wh(a->src_dentry,
- au_ftest_ren(a->flags, ISDIR),
- &a->btgt);
- di_write_unlock(a->src_parent);
- di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
- au_fclr_ren(a->flags, ISSAMEDIR);
- } else
- err = au_wr_dir_need_wh(a->src_dentry,
- au_ftest_ren(a->flags, ISDIR),
- &a->btgt);
- if (unlikely(err < 0))
- goto out_children;
- if (err)
- au_fset_ren(a->flags, WHSRC);
-
- /* cpup src */
- if (a->src_btop != a->btgt) {
- struct au_pin pin;
-
- err = au_pin(&pin, a->src_dentry, a->btgt,
- au_opt_udba(a->src_dentry->d_sb),
- AuPin_DI_LOCKED | AuPin_MNT_WRITE);
- if (!err) {
- struct au_cp_generic cpg = {
- .dentry = a->src_dentry,
- .bdst = a->btgt,
- .bsrc = a->src_btop,
- .len = -1,
- .pin = &pin,
- .flags = AuCpup_DTIME | AuCpup_HOPEN
- };
- AuDebugOn(au_dbtop(a->src_dentry) != a->src_btop);
- err = au_sio_cpup_simple(&cpg);
- au_unpin(&pin);
- }
- if (unlikely(err))
- goto out_children;
- a->src_btop = a->btgt;
- a->src_h_dentry = au_h_dptr(a->src_dentry, a->btgt);
- au_fset_ren(a->flags, WHSRC);
- }
-
- /* lock them all */
- err = au_ren_lock(a);
- if (unlikely(err))
- /* leave the copied-up one */
- goto out_children;
-
- if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
- err = au_may_ren(a);
- else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
- err = -ENAMETOOLONG;
- if (unlikely(err))
- goto out_hdir;
-
- /* store timestamps to be revertible */
- au_ren_dt(a);
-
- /* here we go */
- err = do_rename(a);
- if (unlikely(err))
- goto out_dt;
-
- /* update dir attributes */
- au_ren_refresh_dir(a);
-
- /* dput/iput all lower dentries */
- au_ren_refresh(a);
-
- goto out_hdir; /* success */
-
-out_dt:
- au_ren_rev_dt(err, a);
-out_hdir:
- au_ren_unlock(a);
-out_children:
- au_nhash_wh_free(&a->whlist);
- if (err && a->dst_inode && a->dst_btop != a->btgt) {
- AuDbg("btop %d, btgt %d\n", a->dst_btop, a->btgt);
- au_set_h_dptr(a->dst_dentry, a->btgt, NULL);
- au_set_dbtop(a->dst_dentry, a->dst_btop);
- }
-out_parent:
- if (!err)
- d_move(a->src_dentry, a->dst_dentry);
- else {
- au_update_dbtop(a->dst_dentry);
- if (!a->dst_inode)
- d_drop(a->dst_dentry);
- }
- if (au_ftest_ren(a->flags, ISSAMEDIR))
- di_write_unlock(a->dst_parent);
- else
- di_write_unlock2(a->src_parent, a->dst_parent);
-out_unlock:
- aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
-out_free:
- iput(a->dst_inode);
- if (a->thargs)
- au_whtmp_rmdir_free(a->thargs);
- au_delayed_kfree(a);
-out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode private data
- */
-
-#include "aufs.h"
-
-struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
-{
- struct inode *h_inode;
- struct au_hinode *hinode;
-
- IiMustAnyLock(inode);
-
- hinode = au_hinode(au_ii(inode), bindex);
- h_inode = hinode->hi_inode;
- AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
- return h_inode;
-}
-
-/* todo: hard/soft set? */
-void au_hiput(struct au_hinode *hinode)
-{
- au_hn_free(hinode);
- dput(hinode->hi_whdentry);
- iput(hinode->hi_inode);
-}
-
-unsigned int au_hi_flags(struct inode *inode, int isdir)
-{
- unsigned int flags;
- const unsigned int mnt_flags = au_mntflags(inode->i_sb);
-
- flags = 0;
- if (au_opt_test(mnt_flags, XINO))
- au_fset_hi(flags, XINO);
- if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
- au_fset_hi(flags, HNOTIFY);
- return flags;
-}
-
-void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode, unsigned int flags)
-{
- struct au_hinode *hinode;
- struct inode *hi;
- struct au_iinfo *iinfo = au_ii(inode);
-
- IiMustWriteLock(inode);
-
- hinode = au_hinode(iinfo, bindex);
- hi = hinode->hi_inode;
- AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
-
- if (hi)
- au_hiput(hinode);
- hinode->hi_inode = h_inode;
- if (h_inode) {
- int err;
- struct super_block *sb = inode->i_sb;
- struct au_branch *br;
-
- AuDebugOn(inode->i_mode
- && (h_inode->i_mode & S_IFMT)
- != (inode->i_mode & S_IFMT));
- if (bindex == iinfo->ii_btop)
- au_cpup_igen(inode, h_inode);
- br = au_sbr(sb, bindex);
- hinode->hi_id = br->br_id;
- if (au_ftest_hi(flags, XINO)) {
- err = au_xino_write(sb, bindex, h_inode->i_ino,
- inode->i_ino);
- if (unlikely(err))
- AuIOErr1("failed au_xino_write() %d\n", err);
- }
-
- if (au_ftest_hi(flags, HNOTIFY)
- && au_br_hnotifyable(br->br_perm)) {
- err = au_hn_alloc(hinode, inode);
- if (unlikely(err))
- AuIOErr1("au_hn_alloc() %d\n", err);
- }
- }
-}
-
-void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_wh)
-{
- struct au_hinode *hinode;
-
- IiMustWriteLock(inode);
-
- hinode = au_hinode(au_ii(inode), bindex);
- AuDebugOn(hinode->hi_whdentry);
- hinode->hi_whdentry = h_wh;
-}
-
-void au_update_iigen(struct inode *inode, int half)
-{
- struct au_iinfo *iinfo;
- struct au_iigen *iigen;
- unsigned int sigen;
-
- sigen = au_sigen(inode->i_sb);
- iinfo = au_ii(inode);
- iigen = &iinfo->ii_generation;
- spin_lock(&iigen->ig_spin);
- iigen->ig_generation = sigen;
- if (half)
- au_ig_fset(iigen->ig_flags, HALF_REFRESHED);
- else
- au_ig_fclr(iigen->ig_flags, HALF_REFRESHED);
- spin_unlock(&iigen->ig_spin);
-}
-
-/* it may be called at remount time, too */
-void au_update_ibrange(struct inode *inode, int do_put_zero)
-{
- struct au_iinfo *iinfo;
- aufs_bindex_t bindex, bbot;
-
- AuDebugOn(au_is_bad_inode(inode));
- IiMustWriteLock(inode);
-
- iinfo = au_ii(inode);
- if (do_put_zero && iinfo->ii_btop >= 0) {
- for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot;
- bindex++) {
- struct inode *h_i;
-
- h_i = au_hinode(iinfo, bindex)->hi_inode;
- if (h_i
- && !h_i->i_nlink
- && !(h_i->i_state & I_LINKABLE))
- au_set_h_iptr(inode, bindex, NULL, 0);
- }
- }
-
- iinfo->ii_btop = -1;
- iinfo->ii_bbot = -1;
- bbot = au_sbbot(inode->i_sb);
- for (bindex = 0; bindex <= bbot; bindex++)
- if (au_hinode(iinfo, bindex)->hi_inode) {
- iinfo->ii_btop = bindex;
- break;
- }
- if (iinfo->ii_btop >= 0)
- for (bindex = bbot; bindex >= iinfo->ii_btop; bindex--)
- if (au_hinode(iinfo, bindex)->hi_inode) {
- iinfo->ii_bbot = bindex;
- break;
- }
- AuDebugOn(iinfo->ii_btop > iinfo->ii_bbot);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_icntnr_init_once(void *_c)
-{
- struct au_icntnr *c = _c;
- struct au_iinfo *iinfo = &c->iinfo;
-
- spin_lock_init(&iinfo->ii_generation.ig_spin);
- au_rw_init(&iinfo->ii_rwsem);
- inode_init_once(&c->vfs_inode);
-}
-
-void au_hinode_init(struct au_hinode *hinode)
-{
- hinode->hi_inode = NULL;
- hinode->hi_id = -1;
- au_hn_init(hinode);
- hinode->hi_whdentry = NULL;
-}
-
-int au_iinfo_init(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- struct super_block *sb;
- struct au_hinode *hi;
- int nbr, i;
-
- sb = inode->i_sb;
- iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
- nbr = au_sbbot(sb) + 1;
- if (unlikely(nbr <= 0))
- nbr = 1;
- hi = kmalloc_array(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
- if (hi) {
- au_ninodes_inc(sb);
-
- iinfo->ii_hinode = hi;
- for (i = 0; i < nbr; i++, hi++)
- au_hinode_init(hi);
-
- iinfo->ii_generation.ig_generation = au_sigen(sb);
- iinfo->ii_btop = -1;
- iinfo->ii_bbot = -1;
- iinfo->ii_vdir = NULL;
- return 0;
- }
- return -ENOMEM;
-}
-
-int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink)
-{
- int err, i;
- struct au_hinode *hip;
-
- AuRwMustWriteLock(&iinfo->ii_rwsem);
-
- err = -ENOMEM;
- hip = au_krealloc(iinfo->ii_hinode, sizeof(*hip) * nbr, GFP_NOFS,
- may_shrink);
- if (hip) {
- iinfo->ii_hinode = hip;
- i = iinfo->ii_bbot + 1;
- hip += i;
- for (; i < nbr; i++, hip++)
- au_hinode_init(hip);
- err = 0;
- }
-
- return err;
-}
-
-void au_iinfo_fin(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- struct au_hinode *hi;
- struct super_block *sb;
- aufs_bindex_t bindex, bbot;
- const unsigned char unlinked = !inode->i_nlink;
-
- AuDebugOn(au_is_bad_inode(inode));
-
- sb = inode->i_sb;
- au_ninodes_dec(sb);
- if (si_pid_test(sb))
- au_xino_delete_inode(inode, unlinked);
- else {
- /*
- * it is safe to hide the dependency between sbinfo and
- * sb->s_umount.
- */
- lockdep_off();
- si_noflush_read_lock(sb);
- au_xino_delete_inode(inode, unlinked);
- si_read_unlock(sb);
- lockdep_on();
- }
-
- iinfo = au_ii(inode);
- if (iinfo->ii_vdir)
- au_vdir_free(iinfo->ii_vdir, /*atonce*/0);
-
- bindex = iinfo->ii_btop;
- if (bindex >= 0) {
- hi = au_hinode(iinfo, bindex);
- bbot = iinfo->ii_bbot;
- while (bindex++ <= bbot) {
- if (hi->hi_inode)
- au_hiput(hi);
- hi++;
- }
- }
- au_delayed_kfree(iinfo->ii_hinode);
- AuRwDestroy(&iinfo->ii_rwsem);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode functions
- */
-
-#include "aufs.h"
-
-struct inode *au_igrab(struct inode *inode)
-{
- if (inode) {
- AuDebugOn(!atomic_read(&inode->i_count));
- ihold(inode);
- }
- return inode;
-}
-
-static void au_refresh_hinode_attr(struct inode *inode, int do_version)
-{
- au_cpup_attr_all(inode, /*force*/0);
- au_update_iigen(inode, /*half*/1);
- if (do_version)
- inode->i_version++;
-}
-
-static int au_ii_refresh(struct inode *inode, int *update)
-{
- int err, e, nbr;
- umode_t type;
- aufs_bindex_t bindex, new_bindex;
- struct super_block *sb;
- struct au_iinfo *iinfo;
- struct au_hinode *p, *q, tmp;
-
- AuDebugOn(au_is_bad_inode(inode));
- IiMustWriteLock(inode);
-
- *update = 0;
- sb = inode->i_sb;
- nbr = au_sbbot(sb) + 1;
- type = inode->i_mode & S_IFMT;
- iinfo = au_ii(inode);
- err = au_hinode_realloc(iinfo, nbr, /*may_shrink*/0);
- if (unlikely(err))
- goto out;
-
- AuDebugOn(iinfo->ii_btop < 0);
- p = au_hinode(iinfo, iinfo->ii_btop);
- for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot;
- bindex++, p++) {
- if (!p->hi_inode)
- continue;
-
- AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT));
- new_bindex = au_br_index(sb, p->hi_id);
- if (new_bindex == bindex)
- continue;
-
- if (new_bindex < 0) {
- *update = 1;
- au_hiput(p);
- p->hi_inode = NULL;
- continue;
- }
-
- if (new_bindex < iinfo->ii_btop)
- iinfo->ii_btop = new_bindex;
- if (iinfo->ii_bbot < new_bindex)
- iinfo->ii_bbot = new_bindex;
- /* swap two lower inode, and loop again */
- q = au_hinode(iinfo, new_bindex);
- tmp = *q;
- *q = *p;
- *p = tmp;
- if (tmp.hi_inode) {
- bindex--;
- p--;
- }
- }
- au_update_ibrange(inode, /*do_put_zero*/0);
- au_hinode_realloc(iinfo, nbr, /*may_shrink*/1); /* harmless if err */
- e = au_dy_irefresh(inode);
- if (unlikely(e && !err))
- err = e;
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-void au_refresh_iop(struct inode *inode, int force_getattr)
-{
- int type;
- struct au_sbinfo *sbi = au_sbi(inode->i_sb);
- const struct inode_operations *iop
- = force_getattr ? aufs_iop : sbi->si_iop_array;
-
- if (inode->i_op == iop)
- return;
-
- switch (inode->i_mode & S_IFMT) {
- case S_IFDIR:
- type = AuIop_DIR;
- break;
- case S_IFLNK:
- type = AuIop_SYMLINK;
- break;
- default:
- type = AuIop_OTHER;
- break;
- }
-
- inode->i_op = iop + type;
- /* unnecessary smp_wmb() */
-}
-
-int au_refresh_hinode_self(struct inode *inode)
-{
- int err, update;
-
- err = au_ii_refresh(inode, &update);
- if (!err)
- au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode));
-
- AuTraceErr(err);
- return err;
-}
-
-int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
-{
- int err, e, update;
- unsigned int flags;
- umode_t mode;
- aufs_bindex_t bindex, bbot;
- unsigned char isdir;
- struct au_hinode *p;
- struct au_iinfo *iinfo;
-
- err = au_ii_refresh(inode, &update);
- if (unlikely(err))
- goto out;
-
- update = 0;
- iinfo = au_ii(inode);
- p = au_hinode(iinfo, iinfo->ii_btop);
- mode = (inode->i_mode & S_IFMT);
- isdir = S_ISDIR(mode);
- flags = au_hi_flags(inode, isdir);
- bbot = au_dbbot(dentry);
- for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) {
- struct inode *h_i, *h_inode;
- struct dentry *h_d;
-
- h_d = au_h_dptr(dentry, bindex);
- if (!h_d || d_is_negative(h_d))
- continue;
-
- h_inode = d_inode(h_d);
- AuDebugOn(mode != (h_inode->i_mode & S_IFMT));
- if (iinfo->ii_btop <= bindex && bindex <= iinfo->ii_bbot) {
- h_i = au_h_iptr(inode, bindex);
- if (h_i) {
- if (h_i == h_inode)
- continue;
- err = -EIO;
- break;
- }
- }
- if (bindex < iinfo->ii_btop)
- iinfo->ii_btop = bindex;
- if (iinfo->ii_bbot < bindex)
- iinfo->ii_bbot = bindex;
- au_set_h_iptr(inode, bindex, au_igrab(h_inode), flags);
- update = 1;
- }
- au_update_ibrange(inode, /*do_put_zero*/0);
- e = au_dy_irefresh(inode);
- if (unlikely(e && !err))
- err = e;
- if (!err)
- au_refresh_hinode_attr(inode, update && isdir);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int set_inode(struct inode *inode, struct dentry *dentry)
-{
- int err;
- unsigned int flags;
- umode_t mode;
- aufs_bindex_t bindex, btop, btail;
- unsigned char isdir;
- struct dentry *h_dentry;
- struct inode *h_inode;
- struct au_iinfo *iinfo;
- struct inode_operations *iop;
-
- IiMustWriteLock(inode);
-
- err = 0;
- isdir = 0;
- iop = au_sbi(inode->i_sb)->si_iop_array;
- btop = au_dbtop(dentry);
- h_dentry = au_h_dptr(dentry, btop);
- h_inode = d_inode(h_dentry);
- mode = h_inode->i_mode;
- switch (mode & S_IFMT) {
- case S_IFREG:
- btail = au_dbtail(dentry);
- inode->i_op = iop + AuIop_OTHER;
- inode->i_fop = &aufs_file_fop;
- err = au_dy_iaop(inode, btop, h_inode);
- if (unlikely(err))
- goto out;
- break;
- case S_IFDIR:
- isdir = 1;
- btail = au_dbtaildir(dentry);
- inode->i_op = iop + AuIop_DIR;
- inode->i_fop = &aufs_dir_fop;
- break;
- case S_IFLNK:
- btail = au_dbtail(dentry);
- inode->i_op = iop + AuIop_SYMLINK;
- break;
- case S_IFBLK:
- case S_IFCHR:
- case S_IFIFO:
- case S_IFSOCK:
- btail = au_dbtail(dentry);
- inode->i_op = iop + AuIop_OTHER;
- init_special_inode(inode, mode, h_inode->i_rdev);
- break;
- default:
- AuIOErr("Unknown file type 0%o\n", mode);
- err = -EIO;
- goto out;
- }
-
- /* do not set hnotify for whiteouted dirs (SHWH mode) */
- flags = au_hi_flags(inode, isdir);
- if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
- && au_ftest_hi(flags, HNOTIFY)
- && dentry->d_name.len > AUFS_WH_PFX_LEN
- && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
- au_fclr_hi(flags, HNOTIFY);
- iinfo = au_ii(inode);
- iinfo->ii_btop = btop;
- iinfo->ii_bbot = btail;
- for (bindex = btop; bindex <= btail; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry)
- au_set_h_iptr(inode, bindex,
- au_igrab(d_inode(h_dentry)), flags);
- }
- au_cpup_attr_all(inode, /*force*/1);
- /*
- * to force calling aufs_get_acl() every time,
- * do not call cache_no_acl() for aufs inode.
- */
-
-out:
- return err;
-}
-
-/*
- * successful returns with iinfo write_locked
- * minus: errno
- * zero: success, matched
- * plus: no error, but unmatched
- */
-static int reval_inode(struct inode *inode, struct dentry *dentry)
-{
- int err;
- unsigned int gen, igflags;
- aufs_bindex_t bindex, bbot;
- struct inode *h_inode, *h_dinode;
- struct dentry *h_dentry;
-
- /*
- * before this function, if aufs got any iinfo lock, it must be only
- * one, the parent dir.
- * it can happen by UDBA and the obsoleted inode number.
- */
- err = -EIO;
- if (unlikely(inode->i_ino == parent_ino(dentry)))
- goto out;
-
- err = 1;
- ii_write_lock_new_child(inode);
- h_dentry = au_h_dptr(dentry, au_dbtop(dentry));
- h_dinode = d_inode(h_dentry);
- bbot = au_ibbot(inode);
- for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) {
- h_inode = au_h_iptr(inode, bindex);
- if (!h_inode || h_inode != h_dinode)
- continue;
-
- err = 0;
- gen = au_iigen(inode, &igflags);
- if (gen == au_digen(dentry)
- && !au_ig_ftest(igflags, HALF_REFRESHED))
- break;
-
- /* fully refresh inode using dentry */
- err = au_refresh_hinode(inode, dentry);
- if (!err)
- au_update_iigen(inode, /*half*/0);
- break;
- }
-
- if (unlikely(err))
- ii_write_unlock(inode);
-out:
- return err;
-}
-
-int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- unsigned int d_type, ino_t *ino)
-{
- int err;
- struct mutex *mtx;
-
- /* prevent hardlinked inode number from race condition */
- mtx = NULL;
- if (d_type != DT_DIR) {
- mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx;
- mutex_lock(mtx);
- }
- err = au_xino_read(sb, bindex, h_ino, ino);
- if (unlikely(err))
- goto out;
-
- if (!*ino) {
- err = -EIO;
- *ino = au_xino_new_ino(sb);
- if (unlikely(!*ino))
- goto out;
- err = au_xino_write(sb, bindex, h_ino, *ino);
- if (unlikely(err))
- goto out;
- }
-
-out:
- if (mtx)
- mutex_unlock(mtx);
- return err;
-}
-
-/* successful returns with iinfo write_locked */
-/* todo: return with unlocked? */
-struct inode *au_new_inode(struct dentry *dentry, int must_new)
-{
- struct inode *inode, *h_inode;
- struct dentry *h_dentry;
- struct super_block *sb;
- struct mutex *mtx;
- ino_t h_ino, ino;
- int err;
- aufs_bindex_t btop;
-
- sb = dentry->d_sb;
- btop = au_dbtop(dentry);
- h_dentry = au_h_dptr(dentry, btop);
- h_inode = d_inode(h_dentry);
- h_ino = h_inode->i_ino;
-
- /*
- * stop 'race'-ing between hardlinks under different
- * parents.
- */
- mtx = NULL;
- if (!d_is_dir(h_dentry))
- mtx = &au_sbr(sb, btop)->br_xino.xi_nondir_mtx;
-
-new_ino:
- if (mtx)
- mutex_lock(mtx);
- err = au_xino_read(sb, btop, h_ino, &ino);
- inode = ERR_PTR(err);
- if (unlikely(err))
- goto out;
-
- if (!ino) {
- ino = au_xino_new_ino(sb);
- if (unlikely(!ino)) {
- inode = ERR_PTR(-EIO);
- goto out;
- }
- }
-
- AuDbg("i%lu\n", (unsigned long)ino);
- inode = au_iget_locked(sb, ino);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
- if (inode->i_state & I_NEW) {
- ii_write_lock_new_child(inode);
- err = set_inode(inode, dentry);
- if (!err) {
- unlock_new_inode(inode);
- goto out; /* success */
- }
-
- /*
- * iget_failed() calls iput(), but we need to call
- * ii_write_unlock() after iget_failed(). so dirty hack for
- * i_count.
- */
- atomic_inc(&inode->i_count);
- iget_failed(inode);
- ii_write_unlock(inode);
- au_xino_write(sb, btop, h_ino, /*ino*/0);
- /* ignore this error */
- goto out_iput;
- } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) {
- /*
- * horrible race condition between lookup, readdir and copyup
- * (or something).
- */
- if (mtx)
- mutex_unlock(mtx);
- err = reval_inode(inode, dentry);
- if (unlikely(err < 0)) {
- mtx = NULL;
- goto out_iput;
- }
-
- if (!err) {
- mtx = NULL;
- goto out; /* success */
- } else if (mtx)
- mutex_lock(mtx);
- }
-
- if (unlikely(au_test_fs_unique_ino(h_inode)))
- AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
- " b%d, %s, %pd, hi%lu, i%lu.\n",
- btop, au_sbtype(h_dentry->d_sb), dentry,
- (unsigned long)h_ino, (unsigned long)ino);
- ino = 0;
- err = au_xino_write(sb, btop, h_ino, /*ino*/0);
- if (!err) {
- iput(inode);
- if (mtx)
- mutex_unlock(mtx);
- goto new_ino;
- }
-
-out_iput:
- iput(inode);
- inode = ERR_PTR(err);
-out:
- if (mtx)
- mutex_unlock(mtx);
- return inode;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
- struct inode *inode)
-{
- int err;
- struct inode *hi;
-
- err = au_br_rdonly(au_sbr(sb, bindex));
-
- /* pseudo-link after flushed may happen out of bounds */
- if (!err
- && inode
- && au_ibtop(inode) <= bindex
- && bindex <= au_ibbot(inode)) {
- /*
- * permission check is unnecessary since vfsub routine
- * will be called later
- */
- hi = au_h_iptr(inode, bindex);
- if (hi)
- err = IS_IMMUTABLE(hi) ? -EROFS : 0;
- }
-
- return err;
-}
-
-int au_test_h_perm(struct inode *h_inode, int mask)
-{
- if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
- return 0;
- return inode_permission(h_inode, mask);
-}
-
-int au_test_h_perm_sio(struct inode *h_inode, int mask)
-{
- if (au_test_nfs(h_inode->i_sb)
- && (mask & MAY_WRITE)
- && S_ISDIR(h_inode->i_mode))
- mask |= MAY_READ; /* force permission check */
- return au_test_h_perm(h_inode, mask);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * inode operations
- */
-
-#ifndef __AUFS_INODE_H__
-#define __AUFS_INODE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fsnotify.h>
-#include "rwsem.h"
-
-struct vfsmount;
-
-struct au_hnotify {
-#ifdef CONFIG_AUFS_HNOTIFY
-#ifdef CONFIG_AUFS_HFSNOTIFY
- /* never use fsnotify_add_vfsmount_mark() */
- struct fsnotify_mark hn_mark;
-#endif
- union {
- struct inode *hn_aufs_inode; /* no get/put */
- struct llist_node hn_lnode; /* delayed free */
- };
-#endif
-} ____cacheline_aligned_in_smp;
-
-struct au_hinode {
- struct inode *hi_inode;
- aufs_bindex_t hi_id;
-#ifdef CONFIG_AUFS_HNOTIFY
- struct au_hnotify *hi_notify;
-#endif
-
- /* reference to the copied-up whiteout with get/put */
- struct dentry *hi_whdentry;
-};
-
-/* ig_flags */
-#define AuIG_HALF_REFRESHED 1
-#define au_ig_ftest(flags, name) ((flags) & AuIG_##name)
-#define au_ig_fset(flags, name) \
- do { (flags) |= AuIG_##name; } while (0)
-#define au_ig_fclr(flags, name) \
- do { (flags) &= ~AuIG_##name; } while (0)
-
-struct au_iigen {
- spinlock_t ig_spin;
- __u32 ig_generation, ig_flags;
-};
-
-struct au_vdir;
-struct au_iinfo {
- struct au_iigen ii_generation;
- struct super_block *ii_hsb1; /* no get/put */
-
- struct au_rwsem ii_rwsem;
- aufs_bindex_t ii_btop, ii_bbot;
- __u32 ii_higen;
- struct au_hinode *ii_hinode;
- struct au_vdir *ii_vdir;
-};
-
-struct au_icntnr {
- struct au_iinfo iinfo;
- struct inode vfs_inode;
- union {
- struct hlist_node plink;
- struct llist_node lnode; /* delayed free */
- };
-} ____cacheline_aligned_in_smp;
-
-/* au_pin flags */
-#define AuPin_DI_LOCKED 1
-#define AuPin_MNT_WRITE (1 << 1)
-#define au_ftest_pin(flags, name) ((flags) & AuPin_##name)
-#define au_fset_pin(flags, name) \
- do { (flags) |= AuPin_##name; } while (0)
-#define au_fclr_pin(flags, name) \
- do { (flags) &= ~AuPin_##name; } while (0)
-
-struct au_pin {
- /* input */
- struct dentry *dentry;
- unsigned int udba;
- unsigned char lsc_di, lsc_hi, flags;
- aufs_bindex_t bindex;
-
- /* output */
- struct dentry *parent;
- struct au_hinode *hdir;
- struct vfsmount *h_mnt;
-
- /* temporary unlock/relock for copyup */
- struct dentry *h_dentry, *h_parent;
- struct au_branch *br;
- struct task_struct *task;
-};
-
-void au_pin_hdir_unlock(struct au_pin *p);
-int au_pin_hdir_lock(struct au_pin *p);
-int au_pin_hdir_relock(struct au_pin *p);
-void au_pin_hdir_acquire_nest(struct au_pin *p);
-void au_pin_hdir_release(struct au_pin *p);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_iinfo *au_ii(struct inode *inode)
-{
- BUG_ON(is_bad_inode(inode));
- return &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* inode.c */
-struct inode *au_igrab(struct inode *inode);
-void au_refresh_iop(struct inode *inode, int force_getattr);
-int au_refresh_hinode_self(struct inode *inode);
-int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
-int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- unsigned int d_type, ino_t *ino);
-struct inode *au_new_inode(struct dentry *dentry, int must_new);
-int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
- struct inode *inode);
-int au_test_h_perm(struct inode *h_inode, int mask);
-int au_test_h_perm_sio(struct inode *h_inode, int mask);
-
-static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
- ino_t h_ino, unsigned int d_type, ino_t *ino)
-{
-#ifdef CONFIG_AUFS_SHWH
- return au_ino(sb, bindex, h_ino, d_type, ino);
-#else
- return 0;
-#endif
-}
-
-/* i_op.c */
-enum {
- AuIop_SYMLINK,
- AuIop_DIR,
- AuIop_OTHER,
- AuIop_Last
-};
-extern struct inode_operations aufs_iop[AuIop_Last],
- aufs_iop_nogetattr[AuIop_Last];
-
-/* au_wr_dir flags */
-#define AuWrDir_ADD_ENTRY 1
-#define AuWrDir_ISDIR (1 << 1)
-#define AuWrDir_TMPFILE (1 << 2)
-#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
-#define au_fset_wrdir(flags, name) \
- do { (flags) |= AuWrDir_##name; } while (0)
-#define au_fclr_wrdir(flags, name) \
- do { (flags) &= ~AuWrDir_##name; } while (0)
-
-struct au_wr_dir_args {
- aufs_bindex_t force_btgt;
- unsigned char flags;
-};
-int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
- struct au_wr_dir_args *args);
-
-struct dentry *au_pinned_h_parent(struct au_pin *pin);
-void au_pin_init(struct au_pin *pin, struct dentry *dentry,
- aufs_bindex_t bindex, int lsc_di, int lsc_hi,
- unsigned int udba, unsigned char flags);
-int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int udba, unsigned char flags) __must_check;
-int au_do_pin(struct au_pin *pin) __must_check;
-void au_unpin(struct au_pin *pin);
-int au_reval_for_attr(struct dentry *dentry, unsigned int sigen);
-
-#define AuIcpup_DID_CPUP 1
-#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name)
-#define au_fset_icpup(flags, name) \
- do { (flags) |= AuIcpup_##name; } while (0)
-#define au_fclr_icpup(flags, name) \
- do { (flags) &= ~AuIcpup_##name; } while (0)
-
-struct au_icpup_args {
- unsigned char flags;
- unsigned char pin_flags;
- aufs_bindex_t btgt;
- unsigned int udba;
- struct au_pin pin;
- struct path h_path;
- struct inode *h_inode;
-};
-
-int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
- struct au_icpup_args *a);
-
-int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path);
-
-/* i_op_add.c */
-int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir);
-int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
- dev_t dev);
-int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
-int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool want_excl);
-struct vfsub_aopen_args;
-int au_aopen_or_create(struct inode *dir, struct dentry *dentry,
- struct vfsub_aopen_args *args);
-int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode);
-int aufs_link(struct dentry *src_dentry, struct inode *dir,
- struct dentry *dentry);
-int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
-
-/* i_op_del.c */
-int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
-int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent, int isdir);
-int aufs_unlink(struct inode *dir, struct dentry *dentry);
-int aufs_rmdir(struct inode *dir, struct dentry *dentry);
-
-/* i_op_ren.c */
-int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
-int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
- struct inode *dir, struct dentry *dentry);
-
-/* iinfo.c */
-struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
-void au_hiput(struct au_hinode *hinode);
-void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_wh);
-unsigned int au_hi_flags(struct inode *inode, int isdir);
-
-/* hinode flags */
-#define AuHi_XINO 1
-#define AuHi_HNOTIFY (1 << 1)
-#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
-#define au_fset_hi(flags, name) \
- do { (flags) |= AuHi_##name; } while (0)
-#define au_fclr_hi(flags, name) \
- do { (flags) &= ~AuHi_##name; } while (0)
-
-#ifndef CONFIG_AUFS_HNOTIFY
-#undef AuHi_HNOTIFY
-#define AuHi_HNOTIFY 0
-#endif
-
-void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
- struct inode *h_inode, unsigned int flags);
-
-void au_update_iigen(struct inode *inode, int half);
-void au_update_ibrange(struct inode *inode, int do_put_zero);
-
-void au_icntnr_init_once(void *_c);
-void au_hinode_init(struct au_hinode *hinode);
-int au_iinfo_init(struct inode *inode);
-void au_iinfo_fin(struct inode *inode);
-int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink);
-
-#ifdef CONFIG_PROC_FS
-/* plink.c */
-int au_plink_maint(struct super_block *sb, int flags);
-struct au_sbinfo;
-void au_plink_maint_leave(struct au_sbinfo *sbinfo);
-int au_plink_maint_enter(struct super_block *sb);
-#ifdef CONFIG_AUFS_DEBUG
-void au_plink_list(struct super_block *sb);
-#else
-AuStubVoid(au_plink_list, struct super_block *sb)
-#endif
-int au_plink_test(struct inode *inode);
-struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
-void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_dentry);
-void au_plink_put(struct super_block *sb, int verbose);
-void au_plink_clean(struct super_block *sb, int verbose);
-void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
-#else
-AuStubInt0(au_plink_maint, struct super_block *sb, int flags);
-AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo);
-AuStubInt0(au_plink_maint_enter, struct super_block *sb);
-AuStubVoid(au_plink_list, struct super_block *sb);
-AuStubInt0(au_plink_test, struct inode *inode);
-AuStub(struct dentry *, au_plink_lkup, return NULL,
- struct inode *inode, aufs_bindex_t bindex);
-AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_dentry);
-AuStubVoid(au_plink_put, struct super_block *sb, int verbose);
-AuStubVoid(au_plink_clean, struct super_block *sb, int verbose);
-AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id);
-#endif /* CONFIG_PROC_FS */
-
-#ifdef CONFIG_AUFS_XATTR
-/* xattr.c */
-int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags,
- unsigned int verbose);
-ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size);
-ssize_t aufs_getxattr(struct dentry *dentry, struct inode *inode,
- const char *name, void *value, size_t size);
-int aufs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
- const void *value, size_t size, int flags);
-int aufs_removexattr(struct dentry *dentry, const char *name);
-
-/* void au_xattr_init(struct super_block *sb); */
-#else
-AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src,
- int ignore_flags, unsigned int verbose);
-/* AuStubVoid(au_xattr_init, struct super_block *sb); */
-#endif
-
-#ifdef CONFIG_FS_POSIX_ACL
-struct posix_acl *aufs_get_acl(struct inode *inode, int type);
-int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-#endif
-
-#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL)
-enum {
- AU_XATTR_SET,
- AU_XATTR_REMOVE,
- AU_ACL_SET
-};
-
-struct au_srxattr {
- int type;
- union {
- struct {
- const char *name;
- const void *value;
- size_t size;
- int flags;
- } set;
- struct {
- const char *name;
- } remove;
- struct {
- struct posix_acl *acl;
- int type;
- } acl_set;
- } u;
-};
-ssize_t au_srxattr(struct dentry *dentry, struct inode *inode,
- struct au_srxattr *arg);
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for iinfo */
-enum {
- AuLsc_II_CHILD, /* child first */
- AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */
- AuLsc_II_CHILD3, /* copyup dirs */
- AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */
- AuLsc_II_PARENT2,
- AuLsc_II_PARENT3, /* copyup dirs */
- AuLsc_II_NEW_CHILD
-};
-
-/*
- * ii_read_lock_child, ii_write_lock_child,
- * ii_read_lock_child2, ii_write_lock_child2,
- * ii_read_lock_child3, ii_write_lock_child3,
- * ii_read_lock_parent, ii_write_lock_parent,
- * ii_read_lock_parent2, ii_write_lock_parent2,
- * ii_read_lock_parent3, ii_write_lock_parent3,
- * ii_read_lock_new_child, ii_write_lock_new_child,
- */
-#define AuReadLockFunc(name, lsc) \
-static inline void ii_read_lock_##name(struct inode *i) \
-{ \
- au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-}
-
-#define AuWriteLockFunc(name, lsc) \
-static inline void ii_write_lock_##name(struct inode *i) \
-{ \
- au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-}
-
-#define AuRWLockFuncs(name, lsc) \
- AuReadLockFunc(name, lsc) \
- AuWriteLockFunc(name, lsc)
-
-AuRWLockFuncs(child, CHILD);
-AuRWLockFuncs(child2, CHILD2);
-AuRWLockFuncs(child3, CHILD3);
-AuRWLockFuncs(parent, PARENT);
-AuRWLockFuncs(parent2, PARENT2);
-AuRWLockFuncs(parent3, PARENT3);
-AuRWLockFuncs(new_child, NEW_CHILD);
-
-#undef AuReadLockFunc
-#undef AuWriteLockFunc
-#undef AuRWLockFuncs
-
-/*
- * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
- */
-AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
-
-#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
-#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
-#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
-
-/* ---------------------------------------------------------------------- */
-
-static inline void au_icntnr_init(struct au_icntnr *c)
-{
-#ifdef CONFIG_AUFS_DEBUG
- c->vfs_inode.i_mode = 0;
-#endif
-}
-
-static inline unsigned int au_iigen(struct inode *inode, unsigned int *igflags)
-{
- unsigned int gen;
- struct au_iinfo *iinfo;
- struct au_iigen *iigen;
-
- iinfo = au_ii(inode);
- iigen = &iinfo->ii_generation;
- spin_lock(&iigen->ig_spin);
- if (igflags)
- *igflags = iigen->ig_flags;
- gen = iigen->ig_generation;
- spin_unlock(&iigen->ig_spin);
-
- return gen;
-}
-
-/* tiny test for inode number */
-/* tmpfs generation is too rough */
-static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
-{
- struct au_iinfo *iinfo;
-
- iinfo = au_ii(inode);
- AuRwMustAnyLock(&iinfo->ii_rwsem);
- return !(iinfo->ii_hsb1 == h_inode->i_sb
- && iinfo->ii_higen == h_inode->i_generation);
-}
-
-static inline void au_iigen_dec(struct inode *inode)
-{
- struct au_iinfo *iinfo;
- struct au_iigen *iigen;
-
- iinfo = au_ii(inode);
- iigen = &iinfo->ii_generation;
- spin_lock(&iigen->ig_spin);
- iigen->ig_generation--;
- spin_unlock(&iigen->ig_spin);
-}
-
-static inline int au_iigen_test(struct inode *inode, unsigned int sigen)
-{
- int err;
-
- err = 0;
- if (unlikely(inode && au_iigen(inode, NULL) != sigen))
- err = -EIO;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_hinode *au_hinode(struct au_iinfo *iinfo,
- aufs_bindex_t bindex)
-{
- return iinfo->ii_hinode + bindex;
-}
-
-static inline int au_is_bad_inode(struct inode *inode)
-{
- return !!(is_bad_inode(inode) || !au_hinode(au_ii(inode), 0));
-}
-
-static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
- aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_hinode(au_ii(inode), bindex)->hi_id;
-}
-
-static inline aufs_bindex_t au_ibtop(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_btop;
-}
-
-static inline aufs_bindex_t au_ibbot(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_bbot;
-}
-
-static inline struct au_vdir *au_ivdir(struct inode *inode)
-{
- IiMustAnyLock(inode);
- return au_ii(inode)->ii_vdir;
-}
-
-static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_hinode(au_ii(inode), bindex)->hi_whdentry;
-}
-
-static inline void au_set_ibtop(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_btop = bindex;
-}
-
-static inline void au_set_ibbot(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_bbot = bindex;
-}
-
-static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
-{
- IiMustWriteLock(inode);
- au_ii(inode)->ii_vdir = vdir;
-}
-
-static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
-{
- IiMustAnyLock(inode);
- return au_hinode(au_ii(inode), bindex);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct dentry *au_pinned_parent(struct au_pin *pin)
-{
- if (pin)
- return pin->parent;
- return NULL;
-}
-
-static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
-{
- if (pin && pin->hdir)
- return pin->hdir->hi_inode;
- return NULL;
-}
-
-static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
-{
- if (pin)
- return pin->hdir;
- return NULL;
-}
-
-static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
-{
- if (pin)
- pin->dentry = dentry;
-}
-
-static inline void au_pin_set_parent_lflag(struct au_pin *pin,
- unsigned char lflag)
-{
- if (pin) {
- if (lflag)
- au_fset_pin(pin->flags, DI_LOCKED);
- else
- au_fclr_pin(pin->flags, DI_LOCKED);
- }
-}
-
-#if 0 /* reserved */
-static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
-{
- if (pin) {
- dput(pin->parent);
- pin->parent = dget(parent);
- }
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-struct au_branch;
-#ifdef CONFIG_AUFS_HNOTIFY
-struct au_hnotify_op {
- void (*ctl)(struct au_hinode *hinode, int do_set);
- int (*alloc)(struct au_hinode *hinode);
-
- /*
- * if it returns true, the the caller should free hinode->hi_notify,
- * otherwise ->free() frees it.
- */
- int (*free)(struct au_hinode *hinode,
- struct au_hnotify *hn) __must_check;
-
- void (*fin)(void);
- int (*init)(void);
-
- int (*reset_br)(unsigned int udba, struct au_branch *br, int perm);
- void (*fin_br)(struct au_branch *br);
- int (*init_br)(struct au_branch *br, int perm);
-};
-
-/* hnotify.c */
-int au_hn_alloc(struct au_hinode *hinode, struct inode *inode);
-void au_hn_free(struct au_hinode *hinode);
-void au_hn_ctl(struct au_hinode *hinode, int do_set);
-void au_hn_reset(struct inode *inode, unsigned int flags);
-int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
- struct qstr *h_child_qstr, struct inode *h_child_inode);
-int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm);
-int au_hnotify_init_br(struct au_branch *br, int perm);
-void au_hnotify_fin_br(struct au_branch *br);
-int __init au_hnotify_init(void);
-void au_hnotify_fin(void);
-
-/* hfsnotify.c */
-extern const struct au_hnotify_op au_hnotify_op;
-
-static inline
-void au_hn_init(struct au_hinode *hinode)
-{
- hinode->hi_notify = NULL;
-}
-
-static inline struct au_hnotify *au_hn(struct au_hinode *hinode)
-{
- return hinode->hi_notify;
-}
-
-#else
-AuStub(int, au_hn_alloc, return -EOPNOTSUPP,
- struct au_hinode *hinode __maybe_unused,
- struct inode *inode __maybe_unused)
-AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode)
-AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused)
-AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused,
- int do_set __maybe_unused)
-AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused,
- unsigned int flags __maybe_unused)
-AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused,
- struct au_branch *br __maybe_unused,
- int perm __maybe_unused)
-AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused,
- int perm __maybe_unused)
-AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused)
-AuStubInt0(__init au_hnotify_init, void)
-AuStubVoid(au_hnotify_fin, void)
-AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused)
-#endif /* CONFIG_AUFS_HNOTIFY */
-
-static inline void au_hn_suspend(struct au_hinode *hdir)
-{
- au_hn_ctl(hdir, /*do_set*/0);
-}
-
-static inline void au_hn_resume(struct au_hinode *hdir)
-{
- au_hn_ctl(hdir, /*do_set*/1);
-}
-
-static inline void au_hn_inode_lock(struct au_hinode *hdir)
-{
- inode_lock(hdir->hi_inode);
- au_hn_suspend(hdir);
-}
-
-static inline void au_hn_inode_lock_nested(struct au_hinode *hdir,
- unsigned int sc __maybe_unused)
-{
- inode_lock_nested(hdir->hi_inode, sc);
- au_hn_suspend(hdir);
-}
-
-static inline void au_hn_inode_unlock(struct au_hinode *hdir)
-{
- au_hn_resume(hdir);
- inode_unlock(hdir->hi_inode);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_INODE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * ioctl
- * plink-management and readdir in userspace.
- * assist the pathconf(3) wrapper library.
- * move-down
- * File-based Hierarchical Storage Management.
- */
-
-#include <linux/compat.h>
-#include <linux/file.h>
-#include "aufs.h"
-
-static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg)
-{
- int err, fd;
- aufs_bindex_t wbi, bindex, bbot;
- struct file *h_file;
- struct super_block *sb;
- struct dentry *root;
- struct au_branch *br;
- struct aufs_wbr_fd wbrfd = {
- .oflags = au_dir_roflags,
- .brid = -1
- };
- const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY
- | O_NOATIME | O_CLOEXEC;
-
- AuDebugOn(wbrfd.oflags & ~valid);
-
- if (arg) {
- err = copy_from_user(&wbrfd, arg, sizeof(wbrfd));
- if (unlikely(err)) {
- err = -EFAULT;
- goto out;
- }
-
- err = -EINVAL;
- AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid);
- wbrfd.oflags |= au_dir_roflags;
- AuDbg("0%o\n", wbrfd.oflags);
- if (unlikely(wbrfd.oflags & ~valid))
- goto out;
- }
-
- fd = get_unused_fd_flags(0);
- err = fd;
- if (unlikely(fd < 0))
- goto out;
-
- h_file = ERR_PTR(-EINVAL);
- wbi = 0;
- br = NULL;
- sb = path->dentry->d_sb;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_IR);
- bbot = au_sbbot(sb);
- if (wbrfd.brid >= 0) {
- wbi = au_br_index(sb, wbrfd.brid);
- if (unlikely(wbi < 0 || wbi > bbot))
- goto out_unlock;
- }
-
- h_file = ERR_PTR(-ENOENT);
- br = au_sbr(sb, wbi);
- if (!au_br_writable(br->br_perm)) {
- if (arg)
- goto out_unlock;
-
- bindex = wbi + 1;
- wbi = -1;
- for (; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_writable(br->br_perm)) {
- wbi = bindex;
- br = au_sbr(sb, wbi);
- break;
- }
- }
- }
- AuDbg("wbi %d\n", wbi);
- if (wbi >= 0)
- h_file = au_h_open(root, wbi, wbrfd.oflags, NULL,
- /*force_wr*/0);
-
-out_unlock:
- aufs_read_unlock(root, AuLock_IR);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out_fd;
-
- au_br_put(br); /* cf. au_h_open() */
- fd_install(fd, h_file);
- err = fd;
- goto out; /* success */
-
-out_fd:
- put_unused_fd(fd);
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err;
- struct dentry *dentry;
-
- switch (cmd) {
- case AUFS_CTL_RDU:
- case AUFS_CTL_RDU_INO:
- err = au_rdu_ioctl(file, cmd, arg);
- break;
-
- case AUFS_CTL_WBR_FD:
- err = au_wbr_fd(&file->f_path, (void __user *)arg);
- break;
-
- case AUFS_CTL_IBUSY:
- err = au_ibusy_ioctl(file, arg);
- break;
-
- case AUFS_CTL_BRINFO:
- err = au_brinfo_ioctl(file, arg);
- break;
-
- case AUFS_CTL_FHSM_FD:
- dentry = file->f_path.dentry;
- if (IS_ROOT(dentry))
- err = au_fhsm_fd(dentry->d_sb, arg);
- else
- err = -ENOTTY;
- break;
-
- default:
- /* do not call the lower */
- AuDbg("0x%x\n", cmd);
- err = -ENOTTY;
- }
-
- AuTraceErr(err);
- return err;
-}
-
-long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err;
-
- switch (cmd) {
- case AUFS_CTL_MVDOWN:
- err = au_mvdown(file->f_path.dentry, (void __user *)arg);
- break;
-
- case AUFS_CTL_WBR_FD:
- err = au_wbr_fd(&file->f_path, (void __user *)arg);
- break;
-
- default:
- /* do not call the lower */
- AuDbg("0x%x\n", cmd);
- err = -ENOTTY;
- }
-
- AuTraceErr(err);
- return err;
-}
-
-#ifdef CONFIG_COMPAT
-long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- long err;
-
- switch (cmd) {
- case AUFS_CTL_RDU:
- case AUFS_CTL_RDU_INO:
- err = au_rdu_compat_ioctl(file, cmd, arg);
- break;
-
- case AUFS_CTL_IBUSY:
- err = au_ibusy_compat_ioctl(file, arg);
- break;
-
- case AUFS_CTL_BRINFO:
- err = au_brinfo_compat_ioctl(file, arg);
- break;
-
- default:
- err = aufs_ioctl_dir(file, cmd, arg);
- }
-
- AuTraceErr(err);
- return err;
-}
-
-long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * support for loopback block device as a branch
- */
-
-#include "aufs.h"
-
-/* added into drivers/block/loop.c */
-static struct file *(*backing_file_func)(struct super_block *sb);
-
-/*
- * test if two lower dentries have overlapping branches.
- */
-int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding)
-{
- struct super_block *h_sb;
- struct file *backing_file;
-
- if (unlikely(!backing_file_func)) {
- /* don't load "loop" module here */
- backing_file_func = symbol_get(loop_backing_file);
- if (unlikely(!backing_file_func))
- /* "loop" module is not loaded */
- return 0;
- }
-
- h_sb = h_adding->d_sb;
- backing_file = backing_file_func(h_sb);
- if (!backing_file)
- return 0;
-
- h_adding = backing_file->f_path.dentry;
- /*
- * h_adding can be local NFS.
- * in this case aufs cannot detect the loop.
- */
- if (unlikely(h_adding->d_sb == sb))
- return 1;
- return !!au_test_subdir(h_adding, sb->s_root);
-}
-
-/* true if a kernel thread named 'loop[0-9].*' accesses a file */
-int au_test_loopback_kthread(void)
-{
- int ret;
- struct task_struct *tsk = current;
- char c, comm[sizeof(tsk->comm)];
-
- ret = 0;
- if (tsk->flags & PF_KTHREAD) {
- get_task_comm(comm, tsk);
- c = comm[4];
- ret = ('0' <= c && c <= '9'
- && !strncmp(comm, "loop", 4));
- }
-
- return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define au_warn_loopback_step 16
-static int au_warn_loopback_nelem = au_warn_loopback_step;
-static unsigned long *au_warn_loopback_array;
-
-void au_warn_loopback(struct super_block *h_sb)
-{
- int i, new_nelem;
- unsigned long *a, magic;
- static DEFINE_SPINLOCK(spin);
-
- magic = h_sb->s_magic;
- spin_lock(&spin);
- a = au_warn_loopback_array;
- for (i = 0; i < au_warn_loopback_nelem && *a; i++)
- if (a[i] == magic) {
- spin_unlock(&spin);
- return;
- }
-
- /* h_sb is new to us, print it */
- if (i < au_warn_loopback_nelem) {
- a[i] = magic;
- goto pr;
- }
-
- /* expand the array */
- new_nelem = au_warn_loopback_nelem + au_warn_loopback_step;
- a = au_kzrealloc(au_warn_loopback_array,
- au_warn_loopback_nelem * sizeof(unsigned long),
- new_nelem * sizeof(unsigned long), GFP_ATOMIC,
- /*may_shrink*/0);
- if (a) {
- au_warn_loopback_nelem = new_nelem;
- au_warn_loopback_array = a;
- a[i] = magic;
- goto pr;
- }
-
- spin_unlock(&spin);
- AuWarn1("realloc failed, ignored\n");
- return;
-
-pr:
- spin_unlock(&spin);
- pr_warn("you may want to try another patch for loopback file "
- "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic);
-}
-
-int au_loopback_init(void)
-{
- int err;
- struct super_block *sb __maybe_unused;
-
- BUILD_BUG_ON(sizeof(sb->s_magic) != sizeof(unsigned long));
-
- err = 0;
- au_warn_loopback_array = kcalloc(au_warn_loopback_step,
- sizeof(unsigned long), GFP_NOFS);
- if (unlikely(!au_warn_loopback_array))
- err = -ENOMEM;
-
- return err;
-}
-
-void au_loopback_fin(void)
-{
- if (backing_file_func)
- symbol_put(loop_backing_file);
- au_delayed_kfree(au_warn_loopback_array);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * support for loopback mount as a branch
- */
-
-#ifndef __AUFS_LOOP_H__
-#define __AUFS_LOOP_H__
-
-#ifdef __KERNEL__
-
-struct dentry;
-struct super_block;
-
-#ifdef CONFIG_AUFS_BDEV_LOOP
-/* drivers/block/loop.c */
-struct file *loop_backing_file(struct super_block *sb);
-
-/* loop.c */
-int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding);
-int au_test_loopback_kthread(void);
-void au_warn_loopback(struct super_block *h_sb);
-
-int au_loopback_init(void);
-void au_loopback_fin(void);
-#else
-AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
- struct dentry *h_adding)
-AuStubInt0(au_test_loopback_kthread, void)
-AuStubVoid(au_warn_loopback, struct super_block *h_sb)
-
-AuStubInt0(au_loopback_init, void)
-AuStubVoid(au_loopback_fin, void)
-#endif /* BLK_DEV_LOOP */
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_LOOP_H__ */
+++ /dev/null
-
-# defined in ${srctree}/fs/fuse/inode.c
-# tristate
-ifdef CONFIG_FUSE_FS
-ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546
-endif
-
-# defined in ${srctree}/fs/xfs/xfs_sb.h
-# tristate
-ifdef CONFIG_XFS_FS
-ccflags-y += -DXFS_SB_MAGIC=0x58465342
-endif
-
-# defined in ${srctree}/fs/configfs/mount.c
-# tristate
-ifdef CONFIG_CONFIGFS_FS
-ccflags-y += -DCONFIGFS_MAGIC=0x62656570
-endif
-
-# defined in ${srctree}/fs/ubifs/ubifs.h
-# tristate
-ifdef CONFIG_UBIFS_FS
-ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905
-endif
-
-# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h
-# tristate
-ifdef CONFIG_HFSPLUS_FS
-ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b
-endif
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * module global variables and operations
- */
-
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include "aufs.h"
-
-/* shrinkable realloc */
-void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink)
-{
- size_t sz;
- int diff;
-
- sz = 0;
- diff = -1;
- if (p) {
-#if 0 /* unused */
- if (!new_sz) {
- au_delayed_kfree(p);
- p = NULL;
- goto out;
- }
-#else
- AuDebugOn(!new_sz);
-#endif
- sz = ksize(p);
- diff = au_kmidx_sub(sz, new_sz);
- }
- if (sz && !diff)
- goto out;
-
- if (sz < new_sz)
- /* expand or SLOB */
- p = krealloc(p, new_sz, gfp);
- else if (new_sz < sz && may_shrink) {
- /* shrink */
- void *q;
-
- q = kmalloc(new_sz, gfp);
- if (q) {
- if (p) {
- memcpy(q, p, new_sz);
- au_delayed_kfree(p);
- }
- p = q;
- } else
- p = NULL;
- }
-
-out:
- return p;
-}
-
-void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp,
- int may_shrink)
-{
- p = au_krealloc(p, new_sz, gfp, may_shrink);
- if (p && new_sz > nused)
- memset(p + nused, 0, new_sz - nused);
- return p;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * aufs caches
- */
-
-struct au_dfree au_dfree;
-
-/* delayed free */
-static void au_do_dfree(struct work_struct *work __maybe_unused)
-{
- struct llist_head *head;
- struct llist_node *node, *next;
-
-#define AU_CACHE_DFREE_DO_BODY(name, idx, lnode) do { \
- head = &au_dfree.cache[AuCache_##idx].llist; \
- node = llist_del_all(head); \
- for (; node; node = next) { \
- struct au_##name *p \
- = llist_entry(node, struct au_##name, \
- lnode); \
- next = llist_next(node); \
- au_cache_free_##name(p); \
- } \
- } while (0)
-
- AU_CACHE_DFREE_DO_BODY(dinfo, DINFO, di_lnode);
- AU_CACHE_DFREE_DO_BODY(icntnr, ICNTNR, lnode);
- AU_CACHE_DFREE_DO_BODY(finfo, FINFO, fi_lnode);
- AU_CACHE_DFREE_DO_BODY(vdir, VDIR, vd_lnode);
- AU_CACHE_DFREE_DO_BODY(vdir_dehstr, DEHSTR, lnode);
-#ifdef CONFIG_AUFS_HNOTIFY
- AU_CACHE_DFREE_DO_BODY(hnotify, HNOTIFY, hn_lnode);
-#endif
-
-#define AU_DFREE_DO_BODY(llist, func) do { \
- node = llist_del_all(llist); \
- for (; node; node = next) { \
- next = llist_next(node); \
- func(node); \
- } \
- } while (0)
-
- AU_DFREE_DO_BODY(au_dfree.llist + AU_DFREE_KFREE, kfree);
- AU_DFREE_DO_BODY(au_dfree.llist + AU_DFREE_FREE_PAGE, au_free_page);
-
-#undef AU_CACHE_DFREE_DO_BODY
-#undef AU_DFREE_DO_BODY
-}
-
-AU_CACHE_DFREE_FUNC(dinfo, DINFO, di_lnode);
-AU_CACHE_DFREE_FUNC(icntnr, ICNTNR, lnode);
-AU_CACHE_DFREE_FUNC(finfo, FINFO, fi_lnode);
-AU_CACHE_DFREE_FUNC(vdir, VDIR, vd_lnode);
-AU_CACHE_DFREE_FUNC(vdir_dehstr, DEHSTR, lnode);
-
-static void au_cache_fin(void)
-{
- int i;
- struct au_cache *cp;
-
- /*
- * Make sure all delayed rcu free inodes are flushed before we
- * destroy cache.
- */
- rcu_barrier();
-
- /* excluding AuCache_HNOTIFY */
- BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last);
- flush_delayed_work(&au_dfree.dwork);
- for (i = 0; i < AuCache_HNOTIFY; i++) {
- cp = au_dfree.cache + i;
- AuDebugOn(!llist_empty(&cp->llist));
- kmem_cache_destroy(cp->cache);
- cp->cache = NULL;
- }
-}
-
-static int __init au_cache_init(void)
-{
- struct au_cache *cp;
-
- cp = au_dfree.cache;
- cp[AuCache_DINFO].cache = AuCacheCtor(au_dinfo, au_di_init_once);
- if (cp[AuCache_DINFO].cache)
- /* SLAB_DESTROY_BY_RCU */
- cp[AuCache_ICNTNR].cache = AuCacheCtor(au_icntnr,
- au_icntnr_init_once);
- if (cp[AuCache_ICNTNR].cache)
- cp[AuCache_FINFO].cache = AuCacheCtor(au_finfo,
- au_fi_init_once);
- if (cp[AuCache_FINFO].cache)
- cp[AuCache_VDIR].cache = AuCache(au_vdir);
- if (cp[AuCache_VDIR].cache)
- cp[AuCache_DEHSTR].cache = AuCache(au_vdir_dehstr);
- if (cp[AuCache_DEHSTR].cache)
- return 0;
-
- au_cache_fin();
- return -ENOMEM;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_dir_roflags;
-
-#ifdef CONFIG_AUFS_SBILIST
-/*
- * iterate_supers_type() doesn't protect us from
- * remounting (branch management)
- */
-struct au_sphlhead au_sbilist;
-#endif
-
-/*
- * functions for module interface.
- */
-MODULE_LICENSE("GPL");
-/* MODULE_LICENSE("GPL v2"); */
-MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
-MODULE_DESCRIPTION(AUFS_NAME
- " -- Advanced multi layered unification filesystem");
-MODULE_VERSION(AUFS_VERSION);
-MODULE_ALIAS_FS(AUFS_NAME);
-
-/* this module parameter has no meaning when SYSFS is disabled */
-int sysaufs_brs = 1;
-MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
-module_param_named(brs, sysaufs_brs, int, S_IRUGO);
-
-/* this module parameter has no meaning when USER_NS is disabled */
-bool au_userns;
-MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns");
-module_param_named(allow_userns, au_userns, bool, S_IRUGO);
-
-/* ---------------------------------------------------------------------- */
-
-static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
-
-int au_seq_path(struct seq_file *seq, struct path *path)
-{
- int err;
-
- err = seq_path(seq, path, au_esc_chars);
- if (err > 0)
- err = 0;
- else if (err < 0)
- err = -ENOMEM;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int __init aufs_init(void)
-{
- int err, i;
- char *p;
- struct au_cache *cp;
-
- p = au_esc_chars;
- for (i = 1; i <= ' '; i++)
- *p++ = i;
- *p++ = '\\';
- *p++ = '\x7f';
- *p = 0;
-
- au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
-
- memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop));
- for (i = 0; i < AuIop_Last; i++)
- aufs_iop_nogetattr[i].getattr = NULL;
-
- /* First, initialize au_dfree */
- for (i = 0; i < AuCache_Last; i++) { /* including hnotify */
- cp = au_dfree.cache + i;
- cp->cache = NULL;
- init_llist_head(&cp->llist);
- }
- for (i = 0; i < AU_DFREE_Last; i++)
- init_llist_head(au_dfree.llist + i);
- INIT_DELAYED_WORK(&au_dfree.dwork, au_do_dfree);
-
- au_sbilist_init();
- sysaufs_brs_init();
- au_debug_init();
- au_dy_init();
- err = sysaufs_init();
- if (unlikely(err))
- goto out;
- err = au_procfs_init();
- if (unlikely(err))
- goto out_sysaufs;
- err = au_wkq_init();
- if (unlikely(err))
- goto out_procfs;
- err = au_loopback_init();
- if (unlikely(err))
- goto out_wkq;
- err = au_hnotify_init();
- if (unlikely(err))
- goto out_loopback;
- err = au_sysrq_init();
- if (unlikely(err))
- goto out_hin;
- err = au_cache_init();
- if (unlikely(err))
- goto out_sysrq;
-
- aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0;
- err = register_filesystem(&aufs_fs_type);
- if (unlikely(err))
- goto out_cache;
-
- /* since we define pr_fmt, call printk directly */
- printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
- goto out; /* success */
-
-out_cache:
- au_cache_fin();
-out_sysrq:
- au_sysrq_fin();
-out_hin:
- au_hnotify_fin();
-out_loopback:
- au_loopback_fin();
-out_wkq:
- au_wkq_fin();
-out_procfs:
- au_procfs_fin();
-out_sysaufs:
- sysaufs_fin();
- au_dy_fin();
- flush_delayed_work(&au_dfree.dwork);
-out:
- return err;
-}
-
-static void __exit aufs_exit(void)
-{
- unregister_filesystem(&aufs_fs_type);
- au_cache_fin();
- au_sysrq_fin();
- au_hnotify_fin();
- au_loopback_fin();
- au_wkq_fin();
- au_procfs_fin();
- sysaufs_fin();
- au_dy_fin();
- flush_delayed_work(&au_dfree.dwork);
-}
-
-module_init(aufs_init);
-module_exit(aufs_exit);
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * module initialization and module-global
- */
-
-#ifndef __AUFS_MODULE_H__
-#define __AUFS_MODULE_H__
-
-#ifdef __KERNEL__
-
-#include <linux/slab.h>
-#include "debug.h"
-
-struct path;
-struct seq_file;
-
-/* module parameters */
-extern int sysaufs_brs;
-extern bool au_userns;
-
-/* ---------------------------------------------------------------------- */
-
-extern int au_dir_roflags;
-
-void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink);
-void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp,
- int may_shrink);
-
-static inline int au_kmidx_sub(size_t sz, size_t new_sz)
-{
-#ifndef CONFIG_SLOB
- return kmalloc_index(sz) - kmalloc_index(new_sz);
-#else
- return -1; /* SLOB is untested */
-#endif
-}
-
-int au_seq_path(struct seq_file *seq, struct path *path);
-
-#ifdef CONFIG_PROC_FS
-/* procfs.c */
-int __init au_procfs_init(void);
-void au_procfs_fin(void);
-#else
-AuStubInt0(au_procfs_init, void);
-AuStubVoid(au_procfs_fin, void);
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-/* kmem cache and delayed free */
-enum {
- AuCache_DINFO,
- AuCache_ICNTNR,
- AuCache_FINFO,
- AuCache_VDIR,
- AuCache_DEHSTR,
- AuCache_HNOTIFY, /* must be last */
- AuCache_Last
-};
-
-enum {
- AU_DFREE_KFREE,
- AU_DFREE_FREE_PAGE,
- AU_DFREE_Last
-};
-
-struct au_cache {
- struct kmem_cache *cache;
- struct llist_head llist; /* delayed free */
-};
-
-/*
- * in order to reduce the cost of the internal timer, consolidate all the
- * delayed free works into a single delayed_work.
- */
-struct au_dfree {
- struct au_cache cache[AuCache_Last];
- struct llist_head llist[AU_DFREE_Last];
- struct delayed_work dwork;
-};
-
-extern struct au_dfree au_dfree;
-
-#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
-#define AuCache(type) KMEM_CACHE(type, AuCacheFlags)
-#define AuCacheCtor(type, ctor) \
- kmem_cache_create(#type, sizeof(struct type), \
- __alignof__(struct type), AuCacheFlags, ctor)
-
-#define AU_DFREE_DELAY msecs_to_jiffies(10)
-#define AU_DFREE_BODY(lnode, llist) do { \
- if (llist_add(lnode, llist)) \
- schedule_delayed_work(&au_dfree.dwork, \
- AU_DFREE_DELAY); \
- } while (0)
-#define AU_CACHE_DFREE_FUNC(name, idx, lnode) \
- void au_cache_dfree_##name(struct au_##name *p) \
- { \
- struct au_cache *cp = au_dfree.cache + AuCache_##idx; \
- AU_DFREE_BODY(&p->lnode, &cp->llist); \
- }
-
-#define AuCacheFuncs(name, index) \
-static inline struct au_##name *au_cache_alloc_##name(void) \
-{ return kmem_cache_alloc(au_dfree.cache[AuCache_##index].cache, GFP_NOFS); } \
-static inline void au_cache_free_##name(struct au_##name *p) \
-{ kmem_cache_free(au_dfree.cache[AuCache_##index].cache, p); } \
-void au_cache_dfree_##name(struct au_##name *p)
-
-AuCacheFuncs(dinfo, DINFO);
-AuCacheFuncs(icntnr, ICNTNR);
-AuCacheFuncs(finfo, FINFO);
-AuCacheFuncs(vdir, VDIR);
-AuCacheFuncs(vdir_dehstr, DEHSTR);
-#ifdef CONFIG_AUFS_HNOTIFY
-AuCacheFuncs(hnotify, HNOTIFY);
-#endif
-
-static inline void au_delayed_kfree(const void *p)
-{
- AuDebugOn(!p);
- AuDebugOn(ksize(p) < sizeof(struct llist_node));
-
- AU_DFREE_BODY((void *)p, au_dfree.llist + AU_DFREE_KFREE);
-}
-
-/* cast only */
-static inline void au_free_page(void *p)
-{
- free_page((unsigned long)p);
-}
-
-static inline void au_delayed_free_page(unsigned long addr)
-{
- AU_DFREE_BODY((void *)addr, au_dfree.llist + AU_DFREE_FREE_PAGE);
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_MODULE_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2011-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * move-down, opposite of copy-up
- */
-
-#include "aufs.h"
-
-struct au_mvd_args {
- struct {
- struct super_block *h_sb;
- struct dentry *h_parent;
- struct au_hinode *hdir;
- struct inode *h_dir, *h_inode;
- struct au_pin pin;
- } info[AUFS_MVDOWN_NARRAY];
-
- struct aufs_mvdown mvdown;
- struct dentry *dentry, *parent;
- struct inode *inode, *dir;
- struct super_block *sb;
- aufs_bindex_t bopq, bwh, bfound;
- unsigned char rename_lock;
-};
-
-#define mvd_errno mvdown.au_errno
-#define mvd_bsrc mvdown.stbr[AUFS_MVDOWN_UPPER].bindex
-#define mvd_src_brid mvdown.stbr[AUFS_MVDOWN_UPPER].brid
-#define mvd_bdst mvdown.stbr[AUFS_MVDOWN_LOWER].bindex
-#define mvd_dst_brid mvdown.stbr[AUFS_MVDOWN_LOWER].brid
-
-#define mvd_h_src_sb info[AUFS_MVDOWN_UPPER].h_sb
-#define mvd_h_src_parent info[AUFS_MVDOWN_UPPER].h_parent
-#define mvd_hdir_src info[AUFS_MVDOWN_UPPER].hdir
-#define mvd_h_src_dir info[AUFS_MVDOWN_UPPER].h_dir
-#define mvd_h_src_inode info[AUFS_MVDOWN_UPPER].h_inode
-#define mvd_pin_src info[AUFS_MVDOWN_UPPER].pin
-
-#define mvd_h_dst_sb info[AUFS_MVDOWN_LOWER].h_sb
-#define mvd_h_dst_parent info[AUFS_MVDOWN_LOWER].h_parent
-#define mvd_hdir_dst info[AUFS_MVDOWN_LOWER].hdir
-#define mvd_h_dst_dir info[AUFS_MVDOWN_LOWER].h_dir
-#define mvd_h_dst_inode info[AUFS_MVDOWN_LOWER].h_inode
-#define mvd_pin_dst info[AUFS_MVDOWN_LOWER].pin
-
-#define AU_MVD_PR(flag, ...) do { \
- if (flag) \
- pr_err(__VA_ARGS__); \
- } while (0)
-
-static int find_lower_writable(struct au_mvd_args *a)
-{
- struct super_block *sb;
- aufs_bindex_t bindex, bbot;
- struct au_branch *br;
-
- sb = a->sb;
- bindex = a->mvd_bsrc;
- bbot = au_sbbot(sb);
- if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER)
- for (bindex++; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_fhsm(br->br_perm)
- && (!(au_br_sb(br)->s_flags & MS_RDONLY)))
- return bindex;
- }
- else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER))
- for (bindex++; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (!au_br_rdonly(br))
- return bindex;
- }
- else
- for (bindex++; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (!(au_br_sb(br)->s_flags & MS_RDONLY)) {
- if (au_br_rdonly(br))
- a->mvdown.flags
- |= AUFS_MVDOWN_ROLOWER_R;
- return bindex;
- }
- }
-
- return -1;
-}
-
-/* make the parent dir on bdst */
-static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
-
- err = 0;
- a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc);
- a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst);
- a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc);
- a->mvd_h_dst_parent = NULL;
- if (au_dbbot(a->parent) >= a->mvd_bdst)
- a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
- if (!a->mvd_h_dst_parent) {
- err = au_cpdown_dirs(a->dentry, a->mvd_bdst);
- if (unlikely(err)) {
- AU_MVD_PR(dmsg, "cpdown_dirs failed\n");
- goto out;
- }
- a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* lock them all */
-static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct dentry *h_trap;
-
- a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc);
- a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst);
- err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst,
- au_opt_udba(a->sb),
- AuPin_MNT_WRITE | AuPin_DI_LOCKED);
- AuTraceErr(err);
- if (unlikely(err)) {
- AU_MVD_PR(dmsg, "pin_dst failed\n");
- goto out;
- }
-
- if (a->mvd_h_src_sb != a->mvd_h_dst_sb) {
- a->rename_lock = 0;
- au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
- AuLsc_DI_PARENT, AuLsc_I_PARENT3,
- au_opt_udba(a->sb),
- AuPin_MNT_WRITE | AuPin_DI_LOCKED);
- err = au_do_pin(&a->mvd_pin_src);
- AuTraceErr(err);
- a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
- if (unlikely(err)) {
- AU_MVD_PR(dmsg, "pin_src failed\n");
- goto out_dst;
- }
- goto out; /* success */
- }
-
- a->rename_lock = 1;
- au_pin_hdir_unlock(&a->mvd_pin_dst);
- err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
- au_opt_udba(a->sb),
- AuPin_MNT_WRITE | AuPin_DI_LOCKED);
- AuTraceErr(err);
- a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
- if (unlikely(err)) {
- AU_MVD_PR(dmsg, "pin_src failed\n");
- au_pin_hdir_lock(&a->mvd_pin_dst);
- goto out_dst;
- }
- au_pin_hdir_unlock(&a->mvd_pin_src);
- h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
- a->mvd_h_dst_parent, a->mvd_hdir_dst);
- if (h_trap) {
- err = (h_trap != a->mvd_h_src_parent);
- if (err)
- err = (h_trap != a->mvd_h_dst_parent);
- }
- BUG_ON(err); /* it should never happen */
- if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) {
- err = -EBUSY;
- AuTraceErr(err);
- vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
- a->mvd_h_dst_parent, a->mvd_hdir_dst);
- au_pin_hdir_lock(&a->mvd_pin_src);
- au_unpin(&a->mvd_pin_src);
- au_pin_hdir_lock(&a->mvd_pin_dst);
- goto out_dst;
- }
- goto out; /* success */
-
-out_dst:
- au_unpin(&a->mvd_pin_dst);
-out:
- AuTraceErr(err);
- return err;
-}
-
-static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a)
-{
- if (!a->rename_lock)
- au_unpin(&a->mvd_pin_src);
- else {
- vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
- a->mvd_h_dst_parent, a->mvd_hdir_dst);
- au_pin_hdir_lock(&a->mvd_pin_src);
- au_unpin(&a->mvd_pin_src);
- au_pin_hdir_lock(&a->mvd_pin_dst);
- }
- au_unpin(&a->mvd_pin_dst);
-}
-
-/* copy-down the file */
-static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct au_cp_generic cpg = {
- .dentry = a->dentry,
- .bdst = a->mvd_bdst,
- .bsrc = a->mvd_bsrc,
- .len = -1,
- .pin = &a->mvd_pin_dst,
- .flags = AuCpup_DTIME | AuCpup_HOPEN
- };
-
- AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst);
- if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
- au_fset_cpup(cpg.flags, OVERWRITE);
- if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER)
- au_fset_cpup(cpg.flags, RWDST);
- err = au_sio_cpdown_simple(&cpg);
- if (unlikely(err))
- AU_MVD_PR(dmsg, "cpdown failed\n");
-
- AuTraceErr(err);
- return err;
-}
-
-/*
- * unlink the whiteout on bdst if exist which may be created by UDBA while we
- * were sleeping
- */
-static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct path h_path;
- struct au_branch *br;
- struct inode *delegated;
-
- br = au_sbr(a->sb, a->mvd_bdst);
- h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry)) {
- AU_MVD_PR(dmsg, "wh_lkup failed\n");
- goto out;
- }
-
- err = 0;
- if (d_is_positive(h_path.dentry)) {
- h_path.mnt = au_br_mnt(br);
- delegated = NULL;
- err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path,
- &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- if (unlikely(err))
- AU_MVD_PR(dmsg, "wh_unlink failed\n");
- }
- dput(h_path.dentry);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/*
- * unlink the topmost h_dentry
- */
-static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct path h_path;
- struct inode *delegated;
-
- h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc);
- h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc);
- delegated = NULL;
- err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- if (unlikely(err))
- AU_MVD_PR(dmsg, "unlink failed\n");
-
- AuTraceErr(err);
- return err;
-}
-
-/* Since mvdown succeeded, we ignore an error of this function */
-static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct au_branch *br;
-
- a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED;
- br = au_sbr(a->sb, a->mvd_bsrc);
- err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs);
- if (!err) {
- br = au_sbr(a->sb, a->mvd_bdst);
- a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id;
- err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs);
- }
- if (!err)
- a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED;
- else
- AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err);
-}
-
-/*
- * copy-down the file and unlink the bsrc file.
- * - unlink the bdst whout if exist
- * - copy-down the file (with whtmp name and rename)
- * - unlink the bsrc file
- */
-static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
-
- err = au_do_mkdir(dmsg, a);
- if (!err)
- err = au_do_lock(dmsg, a);
- if (unlikely(err))
- goto out;
-
- /*
- * do not revert the activities we made on bdst since they should be
- * harmless in aufs.
- */
-
- err = au_do_cpdown(dmsg, a);
- if (!err)
- err = au_do_unlink_wh(dmsg, a);
- if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER))
- err = au_do_unlink(dmsg, a);
- if (unlikely(err))
- goto out_unlock;
-
- AuDbg("%pd2, 0x%x, %d --> %d\n",
- a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst);
- if (find_lower_writable(a) < 0)
- a->mvdown.flags |= AUFS_MVDOWN_BOTTOM;
-
- if (a->mvdown.flags & AUFS_MVDOWN_STFS)
- au_do_stfs(dmsg, a);
-
- /* maintain internal array */
- if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) {
- au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL);
- au_set_dbtop(a->dentry, a->mvd_bdst);
- au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0);
- au_set_ibtop(a->inode, a->mvd_bdst);
- } else {
- /* hide the lower */
- au_set_h_dptr(a->dentry, a->mvd_bdst, NULL);
- au_set_dbbot(a->dentry, a->mvd_bsrc);
- au_set_h_iptr(a->inode, a->mvd_bdst, NULL, /*flags*/0);
- au_set_ibbot(a->inode, a->mvd_bsrc);
- }
- if (au_dbbot(a->dentry) < a->mvd_bdst)
- au_set_dbbot(a->dentry, a->mvd_bdst);
- if (au_ibbot(a->inode) < a->mvd_bdst)
- au_set_ibbot(a->inode, a->mvd_bdst);
-
-out_unlock:
- au_do_unlock(dmsg, a);
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* make sure the file is idle */
-static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err, plinked;
-
- err = 0;
- plinked = !!au_opt_test(au_mntflags(a->sb), PLINK);
- if (au_dbtop(a->dentry) == a->mvd_bsrc
- && au_dcount(a->dentry) == 1
- && atomic_read(&a->inode->i_count) == 1
- /* && a->mvd_h_src_inode->i_nlink == 1 */
- && (!plinked || !au_plink_test(a->inode))
- && a->inode->i_nlink == 1)
- goto out;
-
- err = -EBUSY;
- AU_MVD_PR(dmsg,
- "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n",
- a->mvd_bsrc, au_dbtop(a->dentry), au_dcount(a->dentry),
- atomic_read(&a->inode->i_count), a->inode->i_nlink,
- a->mvd_h_src_inode->i_nlink,
- plinked, plinked ? au_plink_test(a->inode) : 0);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* make sure the parent dir is fine */
-static int au_mvd_args_parent(const unsigned char dmsg,
- struct au_mvd_args *a)
-{
- int err;
- aufs_bindex_t bindex;
-
- err = 0;
- if (unlikely(au_alive_dir(a->parent))) {
- err = -ENOENT;
- AU_MVD_PR(dmsg, "parent dir is dead\n");
- goto out;
- }
-
- a->bopq = au_dbdiropq(a->parent);
- bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst);
- AuDbg("b%d\n", bindex);
- if (unlikely((bindex >= 0 && bindex < a->mvd_bdst)
- || (a->bopq != -1 && a->bopq < a->mvd_bdst))) {
- err = -EINVAL;
- a->mvd_errno = EAU_MVDOWN_OPAQUE;
- AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n",
- a->bopq, a->mvd_bdst);
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_mvd_args_intermediate(const unsigned char dmsg,
- struct au_mvd_args *a)
-{
- int err;
- struct au_dinfo *dinfo, *tmp;
-
- /* lookup the next lower positive entry */
- err = -ENOMEM;
- tmp = au_di_alloc(a->sb, AuLsc_DI_TMP);
- if (unlikely(!tmp))
- goto out;
-
- a->bfound = -1;
- a->bwh = -1;
- dinfo = au_di(a->dentry);
- au_di_cp(tmp, dinfo);
- au_di_swap(tmp, dinfo);
-
- /* returns the number of positive dentries */
- err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1,
- /* AuLkup_IGNORE_PERM */ 0);
- if (!err)
- a->bwh = au_dbwh(a->dentry);
- else if (err > 0)
- a->bfound = au_dbtop(a->dentry);
-
- au_di_swap(tmp, dinfo);
- au_rw_write_unlock(&tmp->di_rwsem);
- au_di_free(tmp);
- if (unlikely(err < 0))
- AU_MVD_PR(dmsg, "failed look-up lower\n");
-
- /*
- * here, we have these cases.
- * bfound == -1
- * no positive dentry under bsrc. there are more sub-cases.
- * bwh < 0
- * there no whiteout, we can safely move-down.
- * bwh <= bsrc
- * impossible
- * bsrc < bwh && bwh < bdst
- * there is a whiteout on RO branch. cannot proceed.
- * bwh == bdst
- * there is a whiteout on the RW target branch. it should
- * be removed.
- * bdst < bwh
- * there is a whiteout somewhere unrelated branch.
- * -1 < bfound && bfound <= bsrc
- * impossible.
- * bfound < bdst
- * found, but it is on RO branch between bsrc and bdst. cannot
- * proceed.
- * bfound == bdst
- * found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return
- * error.
- * bdst < bfound
- * found, after we create the file on bdst, it will be hidden.
- */
-
- AuDebugOn(a->bfound == -1
- && a->bwh != -1
- && a->bwh <= a->mvd_bsrc);
- AuDebugOn(-1 < a->bfound
- && a->bfound <= a->mvd_bsrc);
-
- err = -EINVAL;
- if (a->bfound == -1
- && a->mvd_bsrc < a->bwh
- && a->bwh != -1
- && a->bwh < a->mvd_bdst) {
- a->mvd_errno = EAU_MVDOWN_WHITEOUT;
- AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n",
- a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh);
- goto out;
- } else if (a->bfound != -1 && a->bfound < a->mvd_bdst) {
- a->mvd_errno = EAU_MVDOWN_UPPER;
- AU_MVD_PR(dmsg, "bdst %d, bfound %d\n",
- a->mvd_bdst, a->bfound);
- goto out;
- }
-
- err = 0; /* success */
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
-
- err = 0;
- if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
- && a->bfound == a->mvd_bdst)
- err = -EEXIST;
- AuTraceErr(err);
- return err;
-}
-
-static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a)
-{
- int err;
- struct au_branch *br;
-
- err = -EISDIR;
- if (unlikely(S_ISDIR(a->inode->i_mode)))
- goto out;
-
- err = -EINVAL;
- if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER))
- a->mvd_bsrc = au_ibtop(a->inode);
- else {
- a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid);
- if (unlikely(a->mvd_bsrc < 0
- || (a->mvd_bsrc < au_dbtop(a->dentry)
- || au_dbbot(a->dentry) < a->mvd_bsrc
- || !au_h_dptr(a->dentry, a->mvd_bsrc))
- || (a->mvd_bsrc < au_ibtop(a->inode)
- || au_ibbot(a->inode) < a->mvd_bsrc
- || !au_h_iptr(a->inode, a->mvd_bsrc)))) {
- a->mvd_errno = EAU_MVDOWN_NOUPPER;
- AU_MVD_PR(dmsg, "no upper\n");
- goto out;
- }
- }
- if (unlikely(a->mvd_bsrc == au_sbbot(a->sb))) {
- a->mvd_errno = EAU_MVDOWN_BOTTOM;
- AU_MVD_PR(dmsg, "on the bottom\n");
- goto out;
- }
- a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc);
- br = au_sbr(a->sb, a->mvd_bsrc);
- err = au_br_rdonly(br);
- if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) {
- if (unlikely(err))
- goto out;
- } else if (!(vfsub_native_ro(a->mvd_h_src_inode)
- || IS_APPEND(a->mvd_h_src_inode))) {
- if (err)
- a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R;
- /* go on */
- } else
- goto out;
-
- err = -EINVAL;
- if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) {
- a->mvd_bdst = find_lower_writable(a);
- if (unlikely(a->mvd_bdst < 0)) {
- a->mvd_errno = EAU_MVDOWN_BOTTOM;
- AU_MVD_PR(dmsg, "no writable lower branch\n");
- goto out;
- }
- } else {
- a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid);
- if (unlikely(a->mvd_bdst < 0
- || au_sbbot(a->sb) < a->mvd_bdst)) {
- a->mvd_errno = EAU_MVDOWN_NOLOWERBR;
- AU_MVD_PR(dmsg, "no lower brid\n");
- goto out;
- }
- }
-
- err = au_mvd_args_busy(dmsg, a);
- if (!err)
- err = au_mvd_args_parent(dmsg, a);
- if (!err)
- err = au_mvd_args_intermediate(dmsg, a);
- if (!err)
- err = au_mvd_args_exist(dmsg, a);
- if (!err)
- AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg)
-{
- int err, e;
- unsigned char dmsg;
- struct au_mvd_args *args;
- struct inode *inode;
-
- inode = d_inode(dentry);
- err = -EPERM;
- if (unlikely(!capable(CAP_SYS_ADMIN)))
- goto out;
-
- err = -ENOMEM;
- args = kmalloc(sizeof(*args), GFP_NOFS);
- if (unlikely(!args))
- goto out;
-
- err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown));
- if (!err)
- err = !access_ok(VERIFY_WRITE, uarg, sizeof(*uarg));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out_free;
- }
- AuDbg("flags 0x%x\n", args->mvdown.flags);
- args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R);
- args->mvdown.au_errno = 0;
- args->dentry = dentry;
- args->inode = inode;
- args->sb = dentry->d_sb;
-
- err = -ENOENT;
- dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG);
- args->parent = dget_parent(dentry);
- args->dir = d_inode(args->parent);
- inode_lock_nested(args->dir, I_MUTEX_PARENT);
- dput(args->parent);
- if (unlikely(args->parent != dentry->d_parent)) {
- AU_MVD_PR(dmsg, "parent dir is moved\n");
- goto out_dir;
- }
-
- inode_lock_nested(inode, I_MUTEX_CHILD);
- err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_NOPLMW);
- if (unlikely(err))
- goto out_inode;
-
- di_write_lock_parent(args->parent);
- err = au_mvd_args(dmsg, args);
- if (unlikely(err))
- goto out_parent;
-
- err = au_do_mvdown(dmsg, args);
- if (unlikely(err))
- goto out_parent;
-
- au_cpup_attr_timesizes(args->dir);
- au_cpup_attr_timesizes(inode);
- if (!(args->mvdown.flags & AUFS_MVDOWN_KUPPER))
- au_cpup_igen(inode, au_h_iptr(inode, args->mvd_bdst));
- /* au_digen_dec(dentry); */
-
-out_parent:
- di_write_unlock(args->parent);
- aufs_read_unlock(dentry, AuLock_DW);
-out_inode:
- inode_unlock(inode);
-out_dir:
- inode_unlock(args->dir);
-out_free:
- e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown));
- if (unlikely(e))
- err = -EFAULT;
- au_delayed_kfree(args);
-out:
- AuTraceErr(err);
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * mount options/flags
- */
-
-#include <linux/namei.h>
-#include <linux/types.h> /* a distribution requires */
-#include <linux/parser.h>
-#include "aufs.h"
-
-/* ---------------------------------------------------------------------- */
-
-enum {
- Opt_br,
- Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend,
- Opt_idel, Opt_imod,
- Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash,
- Opt_rdblk_def, Opt_rdhash_def,
- Opt_xino, Opt_noxino,
- Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
- Opt_trunc_xino_path, Opt_itrunc_xino,
- Opt_trunc_xib, Opt_notrunc_xib,
- Opt_shwh, Opt_noshwh,
- Opt_plink, Opt_noplink, Opt_list_plink,
- Opt_udba,
- Opt_dio, Opt_nodio,
- Opt_diropq_a, Opt_diropq_w,
- Opt_warn_perm, Opt_nowarn_perm,
- Opt_wbr_copyup, Opt_wbr_create,
- Opt_fhsm_sec,
- Opt_verbose, Opt_noverbose,
- Opt_sum, Opt_nosum, Opt_wsum,
- Opt_dirperm1, Opt_nodirperm1,
- Opt_acl, Opt_noacl,
- Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
-};
-
-static match_table_t options = {
- {Opt_br, "br=%s"},
- {Opt_br, "br:%s"},
-
- {Opt_add, "add=%d:%s"},
- {Opt_add, "add:%d:%s"},
- {Opt_add, "ins=%d:%s"},
- {Opt_add, "ins:%d:%s"},
- {Opt_append, "append=%s"},
- {Opt_append, "append:%s"},
- {Opt_prepend, "prepend=%s"},
- {Opt_prepend, "prepend:%s"},
-
- {Opt_del, "del=%s"},
- {Opt_del, "del:%s"},
- /* {Opt_idel, "idel:%d"}, */
- {Opt_mod, "mod=%s"},
- {Opt_mod, "mod:%s"},
- /* {Opt_imod, "imod:%d:%s"}, */
-
- {Opt_dirwh, "dirwh=%d"},
-
- {Opt_xino, "xino=%s"},
- {Opt_noxino, "noxino"},
- {Opt_trunc_xino, "trunc_xino"},
- {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
- {Opt_notrunc_xino, "notrunc_xino"},
- {Opt_trunc_xino_path, "trunc_xino=%s"},
- {Opt_itrunc_xino, "itrunc_xino=%d"},
- /* {Opt_zxino, "zxino=%s"}, */
- {Opt_trunc_xib, "trunc_xib"},
- {Opt_notrunc_xib, "notrunc_xib"},
-
-#ifdef CONFIG_PROC_FS
- {Opt_plink, "plink"},
-#else
- {Opt_ignore_silent, "plink"},
-#endif
-
- {Opt_noplink, "noplink"},
-
-#ifdef CONFIG_AUFS_DEBUG
- {Opt_list_plink, "list_plink"},
-#endif
-
- {Opt_udba, "udba=%s"},
-
- {Opt_dio, "dio"},
- {Opt_nodio, "nodio"},
-
-#ifdef CONFIG_AUFS_FHSM
- {Opt_fhsm_sec, "fhsm_sec=%d"},
-#else
- {Opt_ignore_silent, "fhsm_sec=%d"},
-#endif
-
- {Opt_diropq_a, "diropq=always"},
- {Opt_diropq_a, "diropq=a"},
- {Opt_diropq_w, "diropq=whiteouted"},
- {Opt_diropq_w, "diropq=w"},
-
- {Opt_warn_perm, "warn_perm"},
- {Opt_nowarn_perm, "nowarn_perm"},
-
- /* keep them temporary */
- {Opt_ignore_silent, "nodlgt"},
- {Opt_ignore_silent, "clean_plink"},
-
-#ifdef CONFIG_AUFS_SHWH
- {Opt_shwh, "shwh"},
-#endif
- {Opt_noshwh, "noshwh"},
-
- {Opt_dirperm1, "dirperm1"},
- {Opt_nodirperm1, "nodirperm1"},
-
- {Opt_verbose, "verbose"},
- {Opt_verbose, "v"},
- {Opt_noverbose, "noverbose"},
- {Opt_noverbose, "quiet"},
- {Opt_noverbose, "q"},
- {Opt_noverbose, "silent"},
-
- {Opt_sum, "sum"},
- {Opt_nosum, "nosum"},
- {Opt_wsum, "wsum"},
-
- {Opt_rdcache, "rdcache=%d"},
- {Opt_rdblk, "rdblk=%d"},
- {Opt_rdblk_def, "rdblk=def"},
- {Opt_rdhash, "rdhash=%d"},
- {Opt_rdhash_def, "rdhash=def"},
-
- {Opt_wbr_create, "create=%s"},
- {Opt_wbr_create, "create_policy=%s"},
- {Opt_wbr_copyup, "cpup=%s"},
- {Opt_wbr_copyup, "copyup=%s"},
- {Opt_wbr_copyup, "copyup_policy=%s"},
-
- /* generic VFS flag */
-#ifdef CONFIG_FS_POSIX_ACL
- {Opt_acl, "acl"},
- {Opt_noacl, "noacl"},
-#else
- {Opt_ignore_silent, "acl"},
- {Opt_ignore_silent, "noacl"},
-#endif
-
- /* internal use for the scripts */
- {Opt_ignore_silent, "si=%s"},
-
- {Opt_br, "dirs=%s"},
- {Opt_ignore, "debug=%d"},
- {Opt_ignore, "delete=whiteout"},
- {Opt_ignore, "delete=all"},
- {Opt_ignore, "imap=%s"},
-
- /* temporary workaround, due to old mount(8)? */
- {Opt_ignore_silent, "relatime"},
-
- {Opt_err, NULL}
-};
-
-/* ---------------------------------------------------------------------- */
-
-static const char *au_parser_pattern(int val, match_table_t tbl)
-{
- struct match_token *p;
-
- p = tbl;
- while (p->pattern) {
- if (p->token == val)
- return p->pattern;
- p++;
- }
- BUG();
- return "??";
-}
-
-static const char *au_optstr(int *val, match_table_t tbl)
-{
- struct match_token *p;
- int v;
-
- v = *val;
- if (!v)
- goto out;
- p = tbl;
- while (p->pattern) {
- if (p->token
- && (v & p->token) == p->token) {
- *val &= ~p->token;
- return p->pattern;
- }
- p++;
- }
-
-out:
- return NULL;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t brperm = {
- {AuBrPerm_RO, AUFS_BRPERM_RO},
- {AuBrPerm_RR, AUFS_BRPERM_RR},
- {AuBrPerm_RW, AUFS_BRPERM_RW},
- {0, NULL}
-};
-
-static match_table_t brattr = {
- /* general */
- {AuBrAttr_COO_REG, AUFS_BRATTR_COO_REG},
- {AuBrAttr_COO_ALL, AUFS_BRATTR_COO_ALL},
- /* 'unpin' attrib is meaningless since linux-3.18-rc1 */
- {AuBrAttr_UNPIN, AUFS_BRATTR_UNPIN},
-#ifdef CONFIG_AUFS_FHSM
- {AuBrAttr_FHSM, AUFS_BRATTR_FHSM},
-#endif
-#ifdef CONFIG_AUFS_XATTR
- {AuBrAttr_ICEX, AUFS_BRATTR_ICEX},
- {AuBrAttr_ICEX_SEC, AUFS_BRATTR_ICEX_SEC},
- {AuBrAttr_ICEX_SYS, AUFS_BRATTR_ICEX_SYS},
- {AuBrAttr_ICEX_TR, AUFS_BRATTR_ICEX_TR},
- {AuBrAttr_ICEX_USR, AUFS_BRATTR_ICEX_USR},
- {AuBrAttr_ICEX_OTH, AUFS_BRATTR_ICEX_OTH},
-#endif
-
- /* ro/rr branch */
- {AuBrRAttr_WH, AUFS_BRRATTR_WH},
-
- /* rw branch */
- {AuBrWAttr_MOO, AUFS_BRWATTR_MOO},
- {AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH},
-
- {0, NULL}
-};
-
-static int br_attr_val(char *str, match_table_t table, substring_t args[])
-{
- int attr, v;
- char *p;
-
- attr = 0;
- do {
- p = strchr(str, '+');
- if (p)
- *p = 0;
- v = match_token(str, table, args);
- if (v) {
- if (v & AuBrAttr_CMOO_Mask)
- attr &= ~AuBrAttr_CMOO_Mask;
- attr |= v;
- } else {
- if (p)
- *p = '+';
- pr_warn("ignored branch attribute %s\n", str);
- break;
- }
- if (p)
- str = p + 1;
- } while (p);
-
- return attr;
-}
-
-static int au_do_optstr_br_attr(au_br_perm_str_t *str, int perm)
-{
- int sz;
- const char *p;
- char *q;
-
- q = str->a;
- *q = 0;
- p = au_optstr(&perm, brattr);
- if (p) {
- sz = strlen(p);
- memcpy(q, p, sz + 1);
- q += sz;
- } else
- goto out;
-
- do {
- p = au_optstr(&perm, brattr);
- if (p) {
- *q++ = '+';
- sz = strlen(p);
- memcpy(q, p, sz + 1);
- q += sz;
- }
- } while (p);
-
-out:
- return q - str->a;
-}
-
-static int noinline_for_stack br_perm_val(char *perm)
-{
- int val, bad, sz;
- char *p;
- substring_t args[MAX_OPT_ARGS];
- au_br_perm_str_t attr;
-
- p = strchr(perm, '+');
- if (p)
- *p = 0;
- val = match_token(perm, brperm, args);
- if (!val) {
- if (p)
- *p = '+';
- pr_warn("ignored branch permission %s\n", perm);
- val = AuBrPerm_RO;
- goto out;
- }
- if (!p)
- goto out;
-
- val |= br_attr_val(p + 1, brattr, args);
-
- bad = 0;
- switch (val & AuBrPerm_Mask) {
- case AuBrPerm_RO:
- case AuBrPerm_RR:
- bad = val & AuBrWAttr_Mask;
- val &= ~AuBrWAttr_Mask;
- break;
- case AuBrPerm_RW:
- bad = val & AuBrRAttr_Mask;
- val &= ~AuBrRAttr_Mask;
- break;
- }
-
- /*
- * 'unpin' attrib becomes meaningless since linux-3.18-rc1, but aufs
- * does not treat it as an error, just warning.
- * this is a tiny guard for the user operation.
- */
- if (val & AuBrAttr_UNPIN) {
- bad |= AuBrAttr_UNPIN;
- val &= ~AuBrAttr_UNPIN;
- }
-
- if (unlikely(bad)) {
- sz = au_do_optstr_br_attr(&attr, bad);
- AuDebugOn(!sz);
- pr_warn("ignored branch attribute %s\n", attr.a);
- }
-
-out:
- return val;
-}
-
-void au_optstr_br_perm(au_br_perm_str_t *str, int perm)
-{
- au_br_perm_str_t attr;
- const char *p;
- char *q;
- int sz;
-
- q = str->a;
- p = au_optstr(&perm, brperm);
- AuDebugOn(!p || !*p);
- sz = strlen(p);
- memcpy(q, p, sz + 1);
- q += sz;
-
- sz = au_do_optstr_br_attr(&attr, perm);
- if (sz) {
- *q++ = '+';
- memcpy(q, attr.a, sz + 1);
- }
-
- AuDebugOn(strlen(str->a) >= sizeof(str->a));
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t udbalevel = {
- {AuOpt_UDBA_REVAL, "reval"},
- {AuOpt_UDBA_NONE, "none"},
-#ifdef CONFIG_AUFS_HNOTIFY
- {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */
-#ifdef CONFIG_AUFS_HFSNOTIFY
- {AuOpt_UDBA_HNOTIFY, "fsnotify"},
-#endif
-#endif
- {-1, NULL}
-};
-
-static int noinline_for_stack udba_val(char *str)
-{
- substring_t args[MAX_OPT_ARGS];
-
- return match_token(str, udbalevel, args);
-}
-
-const char *au_optstr_udba(int udba)
-{
- return au_parser_pattern(udba, udbalevel);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static match_table_t au_wbr_create_policy = {
- {AuWbrCreate_TDP, "tdp"},
- {AuWbrCreate_TDP, "top-down-parent"},
- {AuWbrCreate_RR, "rr"},
- {AuWbrCreate_RR, "round-robin"},
- {AuWbrCreate_MFS, "mfs"},
- {AuWbrCreate_MFS, "most-free-space"},
- {AuWbrCreate_MFSV, "mfs:%d"},
- {AuWbrCreate_MFSV, "most-free-space:%d"},
-
- {AuWbrCreate_MFSRR, "mfsrr:%d"},
- {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
- {AuWbrCreate_PMFS, "pmfs"},
- {AuWbrCreate_PMFSV, "pmfs:%d"},
- {AuWbrCreate_PMFSRR, "pmfsrr:%d"},
- {AuWbrCreate_PMFSRRV, "pmfsrr:%d:%d"},
-
- {-1, NULL}
-};
-
-/*
- * cf. linux/lib/parser.c and cmdline.c
- * gave up calling memparse() since it uses simple_strtoull() instead of
- * kstrto...().
- */
-static int noinline_for_stack
-au_match_ull(substring_t *s, unsigned long long *result)
-{
- int err;
- unsigned int len;
- char a[32];
-
- err = -ERANGE;
- len = s->to - s->from;
- if (len + 1 <= sizeof(a)) {
- memcpy(a, s->from, len);
- a[len] = '\0';
- err = kstrtoull(a, 0, result);
- }
- return err;
-}
-
-static int au_wbr_mfs_wmark(substring_t *arg, char *str,
- struct au_opt_wbr_create *create)
-{
- int err;
- unsigned long long ull;
-
- err = 0;
- if (!au_match_ull(arg, &ull))
- create->mfsrr_watermark = ull;
- else {
- pr_err("bad integer in %s\n", str);
- err = -EINVAL;
- }
-
- return err;
-}
-
-static int au_wbr_mfs_sec(substring_t *arg, char *str,
- struct au_opt_wbr_create *create)
-{
- int n, err;
-
- err = 0;
- if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC)
- create->mfs_second = n;
- else {
- pr_err("bad integer in %s\n", str);
- err = -EINVAL;
- }
-
- return err;
-}
-
-static int noinline_for_stack
-au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
-{
- int err, e;
- substring_t args[MAX_OPT_ARGS];
-
- err = match_token(str, au_wbr_create_policy, args);
- create->wbr_create = err;
- switch (err) {
- case AuWbrCreate_MFSRRV:
- case AuWbrCreate_PMFSRRV:
- e = au_wbr_mfs_wmark(&args[0], str, create);
- if (!e)
- e = au_wbr_mfs_sec(&args[1], str, create);
- if (unlikely(e))
- err = e;
- break;
- case AuWbrCreate_MFSRR:
- case AuWbrCreate_PMFSRR:
- e = au_wbr_mfs_wmark(&args[0], str, create);
- if (unlikely(e)) {
- err = e;
- break;
- }
- /*FALLTHROUGH*/
- case AuWbrCreate_MFS:
- case AuWbrCreate_PMFS:
- create->mfs_second = AUFS_MFS_DEF_SEC;
- break;
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFSV:
- e = au_wbr_mfs_sec(&args[0], str, create);
- if (unlikely(e))
- err = e;
- break;
- }
-
- return err;
-}
-
-const char *au_optstr_wbr_create(int wbr_create)
-{
- return au_parser_pattern(wbr_create, au_wbr_create_policy);
-}
-
-static match_table_t au_wbr_copyup_policy = {
- {AuWbrCopyup_TDP, "tdp"},
- {AuWbrCopyup_TDP, "top-down-parent"},
- {AuWbrCopyup_BUP, "bup"},
- {AuWbrCopyup_BUP, "bottom-up-parent"},
- {AuWbrCopyup_BU, "bu"},
- {AuWbrCopyup_BU, "bottom-up"},
- {-1, NULL}
-};
-
-static int noinline_for_stack au_wbr_copyup_val(char *str)
-{
- substring_t args[MAX_OPT_ARGS];
-
- return match_token(str, au_wbr_copyup_policy, args);
-}
-
-const char *au_optstr_wbr_copyup(int wbr_copyup)
-{
- return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
-
-static void dump_opts(struct au_opts *opts)
-{
-#ifdef CONFIG_AUFS_DEBUG
- /* reduce stack space */
- union {
- struct au_opt_add *add;
- struct au_opt_del *del;
- struct au_opt_mod *mod;
- struct au_opt_xino *xino;
- struct au_opt_xino_itrunc *xino_itrunc;
- struct au_opt_wbr_create *create;
- } u;
- struct au_opt *opt;
-
- opt = opts->opt;
- while (opt->type != Opt_tail) {
- switch (opt->type) {
- case Opt_add:
- u.add = &opt->add;
- AuDbg("add {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_del:
- case Opt_idel:
- u.del = &opt->del;
- AuDbg("del {%s, %p}\n",
- u.del->pathname, u.del->h_path.dentry);
- break;
- case Opt_mod:
- case Opt_imod:
- u.mod = &opt->mod;
- AuDbg("mod {%s, 0x%x, %p}\n",
- u.mod->path, u.mod->perm, u.mod->h_root);
- break;
- case Opt_append:
- u.add = &opt->add;
- AuDbg("append {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_prepend:
- u.add = &opt->add;
- AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
- u.add->bindex, u.add->pathname, u.add->perm,
- u.add->path.dentry);
- break;
- case Opt_dirwh:
- AuDbg("dirwh %d\n", opt->dirwh);
- break;
- case Opt_rdcache:
- AuDbg("rdcache %d\n", opt->rdcache);
- break;
- case Opt_rdblk:
- AuDbg("rdblk %u\n", opt->rdblk);
- break;
- case Opt_rdblk_def:
- AuDbg("rdblk_def\n");
- break;
- case Opt_rdhash:
- AuDbg("rdhash %u\n", opt->rdhash);
- break;
- case Opt_rdhash_def:
- AuDbg("rdhash_def\n");
- break;
- case Opt_xino:
- u.xino = &opt->xino;
- AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file);
- break;
- case Opt_trunc_xino:
- AuLabel(trunc_xino);
- break;
- case Opt_notrunc_xino:
- AuLabel(notrunc_xino);
- break;
- case Opt_trunc_xino_path:
- case Opt_itrunc_xino:
- u.xino_itrunc = &opt->xino_itrunc;
- AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
- break;
- case Opt_noxino:
- AuLabel(noxino);
- break;
- case Opt_trunc_xib:
- AuLabel(trunc_xib);
- break;
- case Opt_notrunc_xib:
- AuLabel(notrunc_xib);
- break;
- case Opt_shwh:
- AuLabel(shwh);
- break;
- case Opt_noshwh:
- AuLabel(noshwh);
- break;
- case Opt_dirperm1:
- AuLabel(dirperm1);
- break;
- case Opt_nodirperm1:
- AuLabel(nodirperm1);
- break;
- case Opt_plink:
- AuLabel(plink);
- break;
- case Opt_noplink:
- AuLabel(noplink);
- break;
- case Opt_list_plink:
- AuLabel(list_plink);
- break;
- case Opt_udba:
- AuDbg("udba %d, %s\n",
- opt->udba, au_optstr_udba(opt->udba));
- break;
- case Opt_dio:
- AuLabel(dio);
- break;
- case Opt_nodio:
- AuLabel(nodio);
- break;
- case Opt_diropq_a:
- AuLabel(diropq_a);
- break;
- case Opt_diropq_w:
- AuLabel(diropq_w);
- break;
- case Opt_warn_perm:
- AuLabel(warn_perm);
- break;
- case Opt_nowarn_perm:
- AuLabel(nowarn_perm);
- break;
- case Opt_verbose:
- AuLabel(verbose);
- break;
- case Opt_noverbose:
- AuLabel(noverbose);
- break;
- case Opt_sum:
- AuLabel(sum);
- break;
- case Opt_nosum:
- AuLabel(nosum);
- break;
- case Opt_wsum:
- AuLabel(wsum);
- break;
- case Opt_wbr_create:
- u.create = &opt->wbr_create;
- AuDbg("create %d, %s\n", u.create->wbr_create,
- au_optstr_wbr_create(u.create->wbr_create));
- switch (u.create->wbr_create) {
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFSV:
- AuDbg("%d sec\n", u.create->mfs_second);
- break;
- case AuWbrCreate_MFSRR:
- AuDbg("%llu watermark\n",
- u.create->mfsrr_watermark);
- break;
- case AuWbrCreate_MFSRRV:
- case AuWbrCreate_PMFSRRV:
- AuDbg("%llu watermark, %d sec\n",
- u.create->mfsrr_watermark,
- u.create->mfs_second);
- break;
- }
- break;
- case Opt_wbr_copyup:
- AuDbg("copyup %d, %s\n", opt->wbr_copyup,
- au_optstr_wbr_copyup(opt->wbr_copyup));
- break;
- case Opt_fhsm_sec:
- AuDbg("fhsm_sec %u\n", opt->fhsm_second);
- break;
- case Opt_acl:
- AuLabel(acl);
- break;
- case Opt_noacl:
- AuLabel(noacl);
- break;
- default:
- BUG();
- }
- opt++;
- }
-#endif
-}
-
-void au_opts_free(struct au_opts *opts)
-{
- struct au_opt *opt;
-
- opt = opts->opt;
- while (opt->type != Opt_tail) {
- switch (opt->type) {
- case Opt_add:
- case Opt_append:
- case Opt_prepend:
- path_put(&opt->add.path);
- break;
- case Opt_del:
- case Opt_idel:
- path_put(&opt->del.h_path);
- break;
- case Opt_mod:
- case Opt_imod:
- dput(opt->mod.h_root);
- break;
- case Opt_xino:
- fput(opt->xino.file);
- break;
- }
- opt++;
- }
-}
-
-static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
- aufs_bindex_t bindex)
-{
- int err;
- struct au_opt_add *add = &opt->add;
- char *p;
-
- add->bindex = bindex;
- add->perm = AuBrPerm_RO;
- add->pathname = opt_str;
- p = strchr(opt_str, '=');
- if (p) {
- *p++ = 0;
- if (*p)
- add->perm = br_perm_val(p);
- }
-
- err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
- if (!err) {
- if (!p) {
- add->perm = AuBrPerm_RO;
- if (au_test_fs_rr(add->path.dentry->d_sb))
- add->perm = AuBrPerm_RR;
- else if (!bindex && !(sb_flags & MS_RDONLY))
- add->perm = AuBrPerm_RW;
- }
- opt->type = Opt_add;
- goto out;
- }
- pr_err("lookup failed %s (%d)\n", add->pathname, err);
- err = -EINVAL;
-
-out:
- return err;
-}
-
-static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
-{
- int err;
-
- del->pathname = args[0].from;
- AuDbg("del path %s\n", del->pathname);
-
- err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
- if (unlikely(err))
- pr_err("lookup failed %s (%d)\n", del->pathname, err);
-
- return err;
-}
-
-#if 0 /* reserved for future use */
-static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
- struct au_opt_del *del, substring_t args[])
-{
- int err;
- struct dentry *root;
-
- err = -EINVAL;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- if (bindex < 0 || au_sbbot(sb) < bindex) {
- pr_err("out of bounds, %d\n", bindex);
- goto out;
- }
-
- err = 0;
- del->h_path.dentry = dget(au_h_dptr(root, bindex));
- del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
-
-out:
- aufs_read_unlock(root, !AuLock_IR);
- return err;
-}
-#endif
-
-static int noinline_for_stack
-au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
-{
- int err;
- struct path path;
- char *p;
-
- err = -EINVAL;
- mod->path = args[0].from;
- p = strchr(mod->path, '=');
- if (unlikely(!p)) {
- pr_err("no permssion %s\n", args[0].from);
- goto out;
- }
-
- *p++ = 0;
- err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
- if (unlikely(err)) {
- pr_err("lookup failed %s (%d)\n", mod->path, err);
- goto out;
- }
-
- mod->perm = br_perm_val(p);
- AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
- mod->h_root = dget(path.dentry);
- path_put(&path);
-
-out:
- return err;
-}
-
-#if 0 /* reserved for future use */
-static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
- struct au_opt_mod *mod, substring_t args[])
-{
- int err;
- struct dentry *root;
-
- err = -EINVAL;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- if (bindex < 0 || au_sbbot(sb) < bindex) {
- pr_err("out of bounds, %d\n", bindex);
- goto out;
- }
-
- err = 0;
- mod->perm = br_perm_val(args[1].from);
- AuDbg("mod path %s, perm 0x%x, %s\n",
- mod->path, mod->perm, args[1].from);
- mod->h_root = dget(au_h_dptr(root, bindex));
-
-out:
- aufs_read_unlock(root, !AuLock_IR);
- return err;
-}
-#endif
-
-static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
- substring_t args[])
-{
- int err;
- struct file *file;
-
- file = au_xino_create(sb, args[0].from, /*silent*/0);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
-
- err = -EINVAL;
- if (unlikely(file->f_path.dentry->d_sb == sb)) {
- fput(file);
- pr_err("%s must be outside\n", args[0].from);
- goto out;
- }
-
- err = 0;
- xino->file = file;
- xino->path = args[0].from;
-
-out:
- return err;
-}
-
-static int noinline_for_stack
-au_opts_parse_xino_itrunc_path(struct super_block *sb,
- struct au_opt_xino_itrunc *xino_itrunc,
- substring_t args[])
-{
- int err;
- aufs_bindex_t bbot, bindex;
- struct path path;
- struct dentry *root;
-
- err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
- if (unlikely(err)) {
- pr_err("lookup failed %s (%d)\n", args[0].from, err);
- goto out;
- }
-
- xino_itrunc->bindex = -1;
- root = sb->s_root;
- aufs_read_lock(root, AuLock_FLUSH);
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- if (au_h_dptr(root, bindex) == path.dentry) {
- xino_itrunc->bindex = bindex;
- break;
- }
- }
- aufs_read_unlock(root, !AuLock_IR);
- path_put(&path);
-
- if (unlikely(xino_itrunc->bindex < 0)) {
- pr_err("no such branch %s\n", args[0].from);
- err = -EINVAL;
- }
-
-out:
- return err;
-}
-
-/* called without aufs lock */
-int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
-{
- int err, n, token;
- aufs_bindex_t bindex;
- unsigned char skipped;
- struct dentry *root;
- struct au_opt *opt, *opt_tail;
- char *opt_str;
- /* reduce the stack space */
- union {
- struct au_opt_xino_itrunc *xino_itrunc;
- struct au_opt_wbr_create *create;
- } u;
- struct {
- substring_t args[MAX_OPT_ARGS];
- } *a;
-
- err = -ENOMEM;
- a = kmalloc(sizeof(*a), GFP_NOFS);
- if (unlikely(!a))
- goto out;
-
- root = sb->s_root;
- err = 0;
- bindex = 0;
- opt = opts->opt;
- opt_tail = opt + opts->max_opt - 1;
- opt->type = Opt_tail;
- while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
- err = -EINVAL;
- skipped = 0;
- token = match_token(opt_str, options, a->args);
- switch (token) {
- case Opt_br:
- err = 0;
- while (!err && (opt_str = strsep(&a->args[0].from, ":"))
- && *opt_str) {
- err = opt_add(opt, opt_str, opts->sb_flags,
- bindex++);
- if (unlikely(!err && ++opt > opt_tail)) {
- err = -E2BIG;
- break;
- }
- opt->type = Opt_tail;
- skipped = 1;
- }
- break;
- case Opt_add:
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- bindex = n;
- err = opt_add(opt, a->args[1].from, opts->sb_flags,
- bindex);
- if (!err)
- opt->type = token;
- break;
- case Opt_append:
- err = opt_add(opt, a->args[0].from, opts->sb_flags,
- /*dummy bindex*/1);
- if (!err)
- opt->type = token;
- break;
- case Opt_prepend:
- err = opt_add(opt, a->args[0].from, opts->sb_flags,
- /*bindex*/0);
- if (!err)
- opt->type = token;
- break;
- case Opt_del:
- err = au_opts_parse_del(&opt->del, a->args);
- if (!err)
- opt->type = token;
- break;
-#if 0 /* reserved for future use */
- case Opt_idel:
- del->pathname = "(indexed)";
- if (unlikely(match_int(&args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- err = au_opts_parse_idel(sb, n, &opt->del, a->args);
- if (!err)
- opt->type = token;
- break;
-#endif
- case Opt_mod:
- err = au_opts_parse_mod(&opt->mod, a->args);
- if (!err)
- opt->type = token;
- break;
-#ifdef IMOD /* reserved for future use */
- case Opt_imod:
- u.mod->path = "(indexed)";
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
- if (!err)
- opt->type = token;
- break;
-#endif
- case Opt_xino:
- err = au_opts_parse_xino(sb, &opt->xino, a->args);
- if (!err)
- opt->type = token;
- break;
-
- case Opt_trunc_xino_path:
- err = au_opts_parse_xino_itrunc_path
- (sb, &opt->xino_itrunc, a->args);
- if (!err)
- opt->type = token;
- break;
-
- case Opt_itrunc_xino:
- u.xino_itrunc = &opt->xino_itrunc;
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- u.xino_itrunc->bindex = n;
- aufs_read_lock(root, AuLock_FLUSH);
- if (n < 0 || au_sbbot(sb) < n) {
- pr_err("out of bounds, %d\n", n);
- aufs_read_unlock(root, !AuLock_IR);
- break;
- }
- aufs_read_unlock(root, !AuLock_IR);
- err = 0;
- opt->type = token;
- break;
-
- case Opt_dirwh:
- if (unlikely(match_int(&a->args[0], &opt->dirwh)))
- break;
- err = 0;
- opt->type = token;
- break;
-
- case Opt_rdcache:
- if (unlikely(match_int(&a->args[0], &n))) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- if (unlikely(n > AUFS_RDCACHE_MAX)) {
- pr_err("rdcache must be smaller than %d\n",
- AUFS_RDCACHE_MAX);
- break;
- }
- opt->rdcache = n;
- err = 0;
- opt->type = token;
- break;
- case Opt_rdblk:
- if (unlikely(match_int(&a->args[0], &n)
- || n < 0
- || n > KMALLOC_MAX_SIZE)) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- if (unlikely(n && n < NAME_MAX)) {
- pr_err("rdblk must be larger than %d\n",
- NAME_MAX);
- break;
- }
- opt->rdblk = n;
- err = 0;
- opt->type = token;
- break;
- case Opt_rdhash:
- if (unlikely(match_int(&a->args[0], &n)
- || n < 0
- || n * sizeof(struct hlist_head)
- > KMALLOC_MAX_SIZE)) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- opt->rdhash = n;
- err = 0;
- opt->type = token;
- break;
-
- case Opt_trunc_xino:
- case Opt_notrunc_xino:
- case Opt_noxino:
- case Opt_trunc_xib:
- case Opt_notrunc_xib:
- case Opt_shwh:
- case Opt_noshwh:
- case Opt_dirperm1:
- case Opt_nodirperm1:
- case Opt_plink:
- case Opt_noplink:
- case Opt_list_plink:
- case Opt_dio:
- case Opt_nodio:
- case Opt_diropq_a:
- case Opt_diropq_w:
- case Opt_warn_perm:
- case Opt_nowarn_perm:
- case Opt_verbose:
- case Opt_noverbose:
- case Opt_sum:
- case Opt_nosum:
- case Opt_wsum:
- case Opt_rdblk_def:
- case Opt_rdhash_def:
- case Opt_acl:
- case Opt_noacl:
- err = 0;
- opt->type = token;
- break;
-
- case Opt_udba:
- opt->udba = udba_val(a->args[0].from);
- if (opt->udba >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
-
- case Opt_wbr_create:
- u.create = &opt->wbr_create;
- u.create->wbr_create
- = au_wbr_create_val(a->args[0].from, u.create);
- if (u.create->wbr_create >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
- case Opt_wbr_copyup:
- opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
- if (opt->wbr_copyup >= 0) {
- err = 0;
- opt->type = token;
- } else
- pr_err("wrong value, %s\n", opt_str);
- break;
-
- case Opt_fhsm_sec:
- if (unlikely(match_int(&a->args[0], &n)
- || n < 0)) {
- pr_err("bad integer in %s\n", opt_str);
- break;
- }
- if (sysaufs_brs) {
- opt->fhsm_second = n;
- opt->type = token;
- } else
- pr_warn("ignored %s\n", opt_str);
- err = 0;
- break;
-
- case Opt_ignore:
- pr_warn("ignored %s\n", opt_str);
- /*FALLTHROUGH*/
- case Opt_ignore_silent:
- skipped = 1;
- err = 0;
- break;
- case Opt_err:
- pr_err("unknown option %s\n", opt_str);
- break;
- }
-
- if (!err && !skipped) {
- if (unlikely(++opt > opt_tail)) {
- err = -E2BIG;
- opt--;
- opt->type = Opt_tail;
- break;
- }
- opt->type = Opt_tail;
- }
- }
-
- au_delayed_kfree(a);
- dump_opts(opts);
- if (unlikely(err))
- au_opts_free(opts);
-
-out:
- return err;
-}
-
-static int au_opt_wbr_create(struct super_block *sb,
- struct au_opt_wbr_create *create)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 1; /* handled */
- sbinfo = au_sbi(sb);
- if (sbinfo->si_wbr_create_ops->fin) {
- err = sbinfo->si_wbr_create_ops->fin(sb);
- if (!err)
- err = 1;
- }
-
- sbinfo->si_wbr_create = create->wbr_create;
- sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
- switch (create->wbr_create) {
- case AuWbrCreate_MFSRRV:
- case AuWbrCreate_MFSRR:
- case AuWbrCreate_PMFSRR:
- case AuWbrCreate_PMFSRRV:
- sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
- /*FALLTHROUGH*/
- case AuWbrCreate_MFS:
- case AuWbrCreate_MFSV:
- case AuWbrCreate_PMFS:
- case AuWbrCreate_PMFSV:
- sbinfo->si_wbr_mfs.mfs_expire
- = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC);
- break;
- }
-
- if (sbinfo->si_wbr_create_ops->init)
- sbinfo->si_wbr_create_ops->init(sb); /* ignore */
-
- return err;
-}
-
-/*
- * returns,
- * plus: processed without an error
- * zero: unprocessed
- */
-static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
- struct au_opts *opts)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 1; /* handled */
- sbinfo = au_sbi(sb);
- switch (opt->type) {
- case Opt_udba:
- sbinfo->si_mntflags &= ~AuOptMask_UDBA;
- sbinfo->si_mntflags |= opt->udba;
- opts->given_udba |= opt->udba;
- break;
-
- case Opt_plink:
- au_opt_set(sbinfo->si_mntflags, PLINK);
- break;
- case Opt_noplink:
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_put(sb, /*verbose*/1);
- au_opt_clr(sbinfo->si_mntflags, PLINK);
- break;
- case Opt_list_plink:
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_list(sb);
- break;
-
- case Opt_dio:
- au_opt_set(sbinfo->si_mntflags, DIO);
- au_fset_opts(opts->flags, REFRESH_DYAOP);
- break;
- case Opt_nodio:
- au_opt_clr(sbinfo->si_mntflags, DIO);
- au_fset_opts(opts->flags, REFRESH_DYAOP);
- break;
-
- case Opt_fhsm_sec:
- au_fhsm_set(sbinfo, opt->fhsm_second);
- break;
-
- case Opt_diropq_a:
- au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
- break;
- case Opt_diropq_w:
- au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
- break;
-
- case Opt_warn_perm:
- au_opt_set(sbinfo->si_mntflags, WARN_PERM);
- break;
- case Opt_nowarn_perm:
- au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
- break;
-
- case Opt_verbose:
- au_opt_set(sbinfo->si_mntflags, VERBOSE);
- break;
- case Opt_noverbose:
- au_opt_clr(sbinfo->si_mntflags, VERBOSE);
- break;
-
- case Opt_sum:
- au_opt_set(sbinfo->si_mntflags, SUM);
- break;
- case Opt_wsum:
- au_opt_clr(sbinfo->si_mntflags, SUM);
- au_opt_set(sbinfo->si_mntflags, SUM_W);
- case Opt_nosum:
- au_opt_clr(sbinfo->si_mntflags, SUM);
- au_opt_clr(sbinfo->si_mntflags, SUM_W);
- break;
-
- case Opt_wbr_create:
- err = au_opt_wbr_create(sb, &opt->wbr_create);
- break;
- case Opt_wbr_copyup:
- sbinfo->si_wbr_copyup = opt->wbr_copyup;
- sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
- break;
-
- case Opt_dirwh:
- sbinfo->si_dirwh = opt->dirwh;
- break;
-
- case Opt_rdcache:
- sbinfo->si_rdcache
- = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC);
- break;
- case Opt_rdblk:
- sbinfo->si_rdblk = opt->rdblk;
- break;
- case Opt_rdblk_def:
- sbinfo->si_rdblk = AUFS_RDBLK_DEF;
- break;
- case Opt_rdhash:
- sbinfo->si_rdhash = opt->rdhash;
- break;
- case Opt_rdhash_def:
- sbinfo->si_rdhash = AUFS_RDHASH_DEF;
- break;
-
- case Opt_shwh:
- au_opt_set(sbinfo->si_mntflags, SHWH);
- break;
- case Opt_noshwh:
- au_opt_clr(sbinfo->si_mntflags, SHWH);
- break;
-
- case Opt_dirperm1:
- au_opt_set(sbinfo->si_mntflags, DIRPERM1);
- break;
- case Opt_nodirperm1:
- au_opt_clr(sbinfo->si_mntflags, DIRPERM1);
- break;
-
- case Opt_trunc_xino:
- au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
- break;
- case Opt_notrunc_xino:
- au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
- break;
-
- case Opt_trunc_xino_path:
- case Opt_itrunc_xino:
- err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
- if (!err)
- err = 1;
- break;
-
- case Opt_trunc_xib:
- au_fset_opts(opts->flags, TRUNC_XIB);
- break;
- case Opt_notrunc_xib:
- au_fclr_opts(opts->flags, TRUNC_XIB);
- break;
-
- case Opt_acl:
- sb->s_flags |= MS_POSIXACL;
- break;
- case Opt_noacl:
- sb->s_flags &= ~MS_POSIXACL;
- break;
-
- default:
- err = 0;
- break;
- }
-
- return err;
-}
-
-/*
- * returns tri-state.
- * plus: processed without an error
- * zero: unprocessed
- * minus: error
- */
-static int au_opt_br(struct super_block *sb, struct au_opt *opt,
- struct au_opts *opts)
-{
- int err, do_refresh;
-
- err = 0;
- switch (opt->type) {
- case Opt_append:
- opt->add.bindex = au_sbbot(sb) + 1;
- if (opt->add.bindex < 0)
- opt->add.bindex = 0;
- goto add;
- case Opt_prepend:
- opt->add.bindex = 0;
- add: /* indented label */
- case Opt_add:
- err = au_br_add(sb, &opt->add,
- au_ftest_opts(opts->flags, REMOUNT));
- if (!err) {
- err = 1;
- au_fset_opts(opts->flags, REFRESH);
- }
- break;
-
- case Opt_del:
- case Opt_idel:
- err = au_br_del(sb, &opt->del,
- au_ftest_opts(opts->flags, REMOUNT));
- if (!err) {
- err = 1;
- au_fset_opts(opts->flags, TRUNC_XIB);
- au_fset_opts(opts->flags, REFRESH);
- }
- break;
-
- case Opt_mod:
- case Opt_imod:
- err = au_br_mod(sb, &opt->mod,
- au_ftest_opts(opts->flags, REMOUNT),
- &do_refresh);
- if (!err) {
- err = 1;
- if (do_refresh)
- au_fset_opts(opts->flags, REFRESH);
- }
- break;
- }
-
- return err;
-}
-
-static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
- struct au_opt_xino **opt_xino,
- struct au_opts *opts)
-{
- int err;
- aufs_bindex_t bbot, bindex;
- struct dentry *root, *parent, *h_root;
-
- err = 0;
- switch (opt->type) {
- case Opt_xino:
- err = au_xino_set(sb, &opt->xino,
- !!au_ftest_opts(opts->flags, REMOUNT));
- if (unlikely(err))
- break;
-
- *opt_xino = &opt->xino;
- au_xino_brid_set(sb, -1);
-
- /* safe d_parent access */
- parent = opt->xino.file->f_path.dentry->d_parent;
- root = sb->s_root;
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- h_root = au_h_dptr(root, bindex);
- if (h_root == parent) {
- au_xino_brid_set(sb, au_sbr_id(sb, bindex));
- break;
- }
- }
- break;
-
- case Opt_noxino:
- au_xino_clr(sb);
- au_xino_brid_set(sb, -1);
- *opt_xino = (void *)-1;
- break;
- }
-
- return err;
-}
-
-int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
- unsigned int pending)
-{
- int err, fhsm;
- aufs_bindex_t bindex, bbot;
- unsigned char do_plink, skip, do_free, can_no_dreval;
- struct au_branch *br;
- struct au_wbr *wbr;
- struct dentry *root, *dentry;
- struct inode *dir, *h_dir;
- struct au_sbinfo *sbinfo;
- struct au_hinode *hdir;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
-
- if (!(sb_flags & MS_RDONLY)) {
- if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
- pr_warn("first branch should be rw\n");
- if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH)))
- pr_warn_once("shwh should be used with ro\n");
- }
-
- if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY)
- && !au_opt_test(sbinfo->si_mntflags, XINO))
- pr_warn_once("udba=*notify requires xino\n");
-
- if (au_opt_test(sbinfo->si_mntflags, DIRPERM1))
- pr_warn_once("dirperm1 breaks the protection"
- " by the permission bits on the lower branch\n");
-
- err = 0;
- fhsm = 0;
- root = sb->s_root;
- dir = d_inode(root);
- do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
- can_no_dreval = !!au_opt_test((sbinfo->si_mntflags | pending),
- UDBA_NONE);
- bbot = au_sbbot(sb);
- for (bindex = 0; !err && bindex <= bbot; bindex++) {
- skip = 0;
- h_dir = au_h_iptr(dir, bindex);
- br = au_sbr(sb, bindex);
-
- if ((br->br_perm & AuBrAttr_ICEX)
- && !h_dir->i_op->listxattr)
- br->br_perm &= ~AuBrAttr_ICEX;
-#if 0
- if ((br->br_perm & AuBrAttr_ICEX_SEC)
- && (au_br_sb(br)->s_flags & MS_NOSEC))
- br->br_perm &= ~AuBrAttr_ICEX_SEC;
-#endif
-
- do_free = 0;
- wbr = br->br_wbr;
- if (wbr)
- wbr_wh_read_lock(wbr);
-
- if (!au_br_writable(br->br_perm)) {
- do_free = !!wbr;
- skip = (!wbr
- || (!wbr->wbr_whbase
- && !wbr->wbr_plink
- && !wbr->wbr_orph));
- } else if (!au_br_wh_linkable(br->br_perm)) {
- /* skip = (!br->br_whbase && !br->br_orph); */
- skip = (!wbr || !wbr->wbr_whbase);
- if (skip && wbr) {
- if (do_plink)
- skip = !!wbr->wbr_plink;
- else
- skip = !wbr->wbr_plink;
- }
- } else {
- /* skip = (br->br_whbase && br->br_ohph); */
- skip = (wbr && wbr->wbr_whbase);
- if (skip) {
- if (do_plink)
- skip = !!wbr->wbr_plink;
- else
- skip = !wbr->wbr_plink;
- }
- }
- if (wbr)
- wbr_wh_read_unlock(wbr);
-
- if (can_no_dreval) {
- dentry = br->br_path.dentry;
- spin_lock(&dentry->d_lock);
- if (dentry->d_flags &
- (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE))
- can_no_dreval = 0;
- spin_unlock(&dentry->d_lock);
- }
-
- if (au_br_fhsm(br->br_perm)) {
- fhsm++;
- AuDebugOn(!br->br_fhsm);
- }
-
- if (skip)
- continue;
-
- hdir = au_hi(dir, bindex);
- au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
- if (wbr)
- wbr_wh_write_lock(wbr);
- err = au_wh_init(br, sb);
- if (wbr)
- wbr_wh_write_unlock(wbr);
- au_hn_inode_unlock(hdir);
-
- if (!err && do_free) {
- if (wbr)
- au_delayed_kfree(wbr);
- br->br_wbr = NULL;
- }
- }
-
- if (can_no_dreval)
- au_fset_si(sbinfo, NO_DREVAL);
- else
- au_fclr_si(sbinfo, NO_DREVAL);
-
- if (fhsm >= 2) {
- au_fset_si(sbinfo, FHSM);
- for (bindex = bbot; bindex >= 0; bindex--) {
- br = au_sbr(sb, bindex);
- if (au_br_fhsm(br->br_perm)) {
- au_fhsm_set_bottom(sb, bindex);
- break;
- }
- }
- } else {
- au_fclr_si(sbinfo, FHSM);
- au_fhsm_set_bottom(sb, -1);
- }
-
- return err;
-}
-
-int au_opts_mount(struct super_block *sb, struct au_opts *opts)
-{
- int err;
- unsigned int tmp;
- aufs_bindex_t bindex, bbot;
- struct au_opt *opt;
- struct au_opt_xino *opt_xino, xino;
- struct au_sbinfo *sbinfo;
- struct au_branch *br;
- struct inode *dir;
-
- SiMustWriteLock(sb);
-
- err = 0;
- opt_xino = NULL;
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail)
- err = au_opt_simple(sb, opt++, opts);
- if (err > 0)
- err = 0;
- else if (unlikely(err < 0))
- goto out;
-
- /* disable xino and udba temporary */
- sbinfo = au_sbi(sb);
- tmp = sbinfo->si_mntflags;
- au_opt_clr(sbinfo->si_mntflags, XINO);
- au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
-
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail)
- err = au_opt_br(sb, opt++, opts);
- if (err > 0)
- err = 0;
- else if (unlikely(err < 0))
- goto out;
-
- bbot = au_sbbot(sb);
- if (unlikely(bbot < 0)) {
- err = -EINVAL;
- pr_err("no branches\n");
- goto out;
- }
-
- if (au_opt_test(tmp, XINO))
- au_opt_set(sbinfo->si_mntflags, XINO);
- opt = opts->opt;
- while (!err && opt->type != Opt_tail)
- err = au_opt_xino(sb, opt++, &opt_xino, opts);
- if (unlikely(err))
- goto out;
-
- err = au_opts_verify(sb, sb->s_flags, tmp);
- if (unlikely(err))
- goto out;
-
- /* restore xino */
- if (au_opt_test(tmp, XINO) && !opt_xino) {
- xino.file = au_xino_def(sb);
- err = PTR_ERR(xino.file);
- if (IS_ERR(xino.file))
- goto out;
-
- err = au_xino_set(sb, &xino, /*remount*/0);
- fput(xino.file);
- if (unlikely(err))
- goto out;
- }
-
- /* restore udba */
- tmp &= AuOptMask_UDBA;
- sbinfo->si_mntflags &= ~AuOptMask_UDBA;
- sbinfo->si_mntflags |= tmp;
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- err = au_hnotify_reset_br(tmp, br, br->br_perm);
- if (unlikely(err))
- AuIOErr("hnotify failed on br %d, %d, ignored\n",
- bindex, err);
- /* go on even if err */
- }
- if (au_opt_test(tmp, UDBA_HNOTIFY)) {
- dir = d_inode(sb->s_root);
- au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
- }
-
-out:
- return err;
-}
-
-int au_opts_remount(struct super_block *sb, struct au_opts *opts)
-{
- int err, rerr;
- unsigned char no_dreval;
- struct inode *dir;
- struct au_opt_xino *opt_xino;
- struct au_opt *opt;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 0;
- dir = d_inode(sb->s_root);
- sbinfo = au_sbi(sb);
- opt_xino = NULL;
- opt = opts->opt;
- while (err >= 0 && opt->type != Opt_tail) {
- err = au_opt_simple(sb, opt, opts);
- if (!err)
- err = au_opt_br(sb, opt, opts);
- if (!err)
- err = au_opt_xino(sb, opt, &opt_xino, opts);
- opt++;
- }
- if (err > 0)
- err = 0;
- AuTraceErr(err);
- /* go on even err */
-
- no_dreval = !!au_ftest_si(sbinfo, NO_DREVAL);
- rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
- if (unlikely(rerr && !err))
- err = rerr;
-
- if (no_dreval != !!au_ftest_si(sbinfo, NO_DREVAL))
- au_fset_opts(opts->flags, REFRESH_IDOP);
-
- if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
- rerr = au_xib_trunc(sb);
- if (unlikely(rerr && !err))
- err = rerr;
- }
-
- /* will be handled by the caller */
- if (!au_ftest_opts(opts->flags, REFRESH)
- && (opts->given_udba
- || au_opt_test(sbinfo->si_mntflags, XINO)
- || au_ftest_opts(opts->flags, REFRESH_IDOP)
- ))
- au_fset_opts(opts->flags, REFRESH);
-
- AuDbg("status 0x%x\n", opts->flags);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-unsigned int au_opt_udba(struct super_block *sb)
-{
- return au_mntflags(sb) & AuOptMask_UDBA;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * mount options/flags
- */
-
-#ifndef __AUFS_OPTS_H__
-#define __AUFS_OPTS_H__
-
-#ifdef __KERNEL__
-
-#include <linux/path.h>
-
-struct file;
-struct super_block;
-
-/* ---------------------------------------------------------------------- */
-
-/* mount flags */
-#define AuOpt_XINO 1 /* external inode number bitmap
- and translation table */
-#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */
-#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */
-#define AuOpt_UDBA_REVAL (1 << 3)
-#define AuOpt_UDBA_HNOTIFY (1 << 4)
-#define AuOpt_SHWH (1 << 5) /* show whiteout */
-#define AuOpt_PLINK (1 << 6) /* pseudo-link */
-#define AuOpt_DIRPERM1 (1 << 7) /* ignore the lower dir's perm
- bits */
-#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */
-#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */
-#define AuOpt_SUM_W (1 << 11) /* unimplemented */
-#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */
-#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */
-#define AuOpt_DIO (1 << 14) /* direct io */
-
-#ifndef CONFIG_AUFS_HNOTIFY
-#undef AuOpt_UDBA_HNOTIFY
-#define AuOpt_UDBA_HNOTIFY 0
-#endif
-#ifndef CONFIG_AUFS_SHWH
-#undef AuOpt_SHWH
-#define AuOpt_SHWH 0
-#endif
-
-#define AuOpt_Def (AuOpt_XINO \
- | AuOpt_UDBA_REVAL \
- | AuOpt_PLINK \
- /* | AuOpt_DIRPERM1 */ \
- | AuOpt_WARN_PERM)
-#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
- | AuOpt_UDBA_REVAL \
- | AuOpt_UDBA_HNOTIFY)
-
-#define au_opt_test(flags, name) (flags & AuOpt_##name)
-#define au_opt_set(flags, name) do { \
- BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
- ((flags) |= AuOpt_##name); \
-} while (0)
-#define au_opt_set_udba(flags, name) do { \
- (flags) &= ~AuOptMask_UDBA; \
- ((flags) |= AuOpt_##name); \
-} while (0)
-#define au_opt_clr(flags, name) do { \
- ((flags) &= ~AuOpt_##name); \
-} while (0)
-
-static inline unsigned int au_opts_plink(unsigned int mntflags)
-{
-#ifdef CONFIG_PROC_FS
- return mntflags;
-#else
- return mntflags & ~AuOpt_PLINK;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* policies to select one among multiple writable branches */
-enum {
- AuWbrCreate_TDP, /* top down parent */
- AuWbrCreate_RR, /* round robin */
- AuWbrCreate_MFS, /* most free space */
- AuWbrCreate_MFSV, /* mfs with seconds */
- AuWbrCreate_MFSRR, /* mfs then rr */
- AuWbrCreate_MFSRRV, /* mfs then rr with seconds */
- AuWbrCreate_PMFS, /* parent and mfs */
- AuWbrCreate_PMFSV, /* parent and mfs with seconds */
- AuWbrCreate_PMFSRR, /* parent, mfs and round-robin */
- AuWbrCreate_PMFSRRV, /* plus seconds */
-
- AuWbrCreate_Def = AuWbrCreate_TDP
-};
-
-enum {
- AuWbrCopyup_TDP, /* top down parent */
- AuWbrCopyup_BUP, /* bottom up parent */
- AuWbrCopyup_BU, /* bottom up */
-
- AuWbrCopyup_Def = AuWbrCopyup_TDP
-};
-
-/* ---------------------------------------------------------------------- */
-
-struct au_opt_add {
- aufs_bindex_t bindex;
- char *pathname;
- int perm;
- struct path path;
-};
-
-struct au_opt_del {
- char *pathname;
- struct path h_path;
-};
-
-struct au_opt_mod {
- char *path;
- int perm;
- struct dentry *h_root;
-};
-
-struct au_opt_xino {
- char *path;
- struct file *file;
-};
-
-struct au_opt_xino_itrunc {
- aufs_bindex_t bindex;
-};
-
-struct au_opt_wbr_create {
- int wbr_create;
- int mfs_second;
- unsigned long long mfsrr_watermark;
-};
-
-struct au_opt {
- int type;
- union {
- struct au_opt_xino xino;
- struct au_opt_xino_itrunc xino_itrunc;
- struct au_opt_add add;
- struct au_opt_del del;
- struct au_opt_mod mod;
- int dirwh;
- int rdcache;
- unsigned int rdblk;
- unsigned int rdhash;
- int udba;
- struct au_opt_wbr_create wbr_create;
- int wbr_copyup;
- unsigned int fhsm_second;
- };
-};
-
-/* opts flags */
-#define AuOpts_REMOUNT 1
-#define AuOpts_REFRESH (1 << 1)
-#define AuOpts_TRUNC_XIB (1 << 2)
-#define AuOpts_REFRESH_DYAOP (1 << 3)
-#define AuOpts_REFRESH_IDOP (1 << 4)
-#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name)
-#define au_fset_opts(flags, name) \
- do { (flags) |= AuOpts_##name; } while (0)
-#define au_fclr_opts(flags, name) \
- do { (flags) &= ~AuOpts_##name; } while (0)
-
-struct au_opts {
- struct au_opt *opt;
- int max_opt;
-
- unsigned int given_udba;
- unsigned int flags;
- unsigned long sb_flags;
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* opts.c */
-void au_optstr_br_perm(au_br_perm_str_t *str, int perm);
-const char *au_optstr_udba(int udba);
-const char *au_optstr_wbr_copyup(int wbr_copyup);
-const char *au_optstr_wbr_create(int wbr_create);
-
-void au_opts_free(struct au_opts *opts);
-int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
-int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
- unsigned int pending);
-int au_opts_mount(struct super_block *sb, struct au_opts *opts);
-int au_opts_remount(struct super_block *sb, struct au_opts *opts);
-
-unsigned int au_opt_udba(struct super_block *sb);
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_OPTS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * pseudo-link
- */
-
-#include "aufs.h"
-
-/*
- * the pseudo-link maintenance mode.
- * during a user process maintains the pseudo-links,
- * prohibit adding a new plink and branch manipulation.
- *
- * Flags
- * NOPLM:
- * For entry functions which will handle plink, and i_mutex is already held
- * in VFS.
- * They cannot wait and should return an error at once.
- * Callers has to check the error.
- * NOPLMW:
- * For entry functions which will handle plink, but i_mutex is not held
- * in VFS.
- * They can wait the plink maintenance mode to finish.
- *
- * They behave like F_SETLK and F_SETLKW.
- * If the caller never handle plink, then both flags are unnecessary.
- */
-
-int au_plink_maint(struct super_block *sb, int flags)
-{
- int err;
- pid_t pid, ppid;
- struct task_struct *parent, *prev;
- struct au_sbinfo *sbi;
-
- SiMustAnyLock(sb);
-
- err = 0;
- if (!au_opt_test(au_mntflags(sb), PLINK))
- goto out;
-
- sbi = au_sbi(sb);
- pid = sbi->si_plink_maint_pid;
- if (!pid || pid == current->pid)
- goto out;
-
- /* todo: it highly depends upon /sbin/mount.aufs */
- prev = NULL;
- parent = current;
- ppid = 0;
- rcu_read_lock();
- while (1) {
- parent = rcu_dereference(parent->real_parent);
- if (parent == prev)
- break;
- ppid = task_pid_vnr(parent);
- if (pid == ppid) {
- rcu_read_unlock();
- goto out;
- }
- prev = parent;
- }
- rcu_read_unlock();
-
- if (au_ftest_lock(flags, NOPLMW)) {
- /* if there is no i_mutex lock in VFS, we don't need to wait */
- /* AuDebugOn(!lockdep_depth(current)); */
- while (sbi->si_plink_maint_pid) {
- si_read_unlock(sb);
- /* gave up wake_up_bit() */
- wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid);
-
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&sbi->si_nowait);
- si_noflush_read_lock(sb);
- }
- } else if (au_ftest_lock(flags, NOPLM)) {
- AuDbg("ppid %d, pid %d\n", ppid, pid);
- err = -EAGAIN;
- }
-
-out:
- return err;
-}
-
-void au_plink_maint_leave(struct au_sbinfo *sbinfo)
-{
- spin_lock(&sbinfo->si_plink_maint_lock);
- sbinfo->si_plink_maint_pid = 0;
- spin_unlock(&sbinfo->si_plink_maint_lock);
- wake_up_all(&sbinfo->si_plink_wq);
-}
-
-int au_plink_maint_enter(struct super_block *sb)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- err = 0;
- sbinfo = au_sbi(sb);
- /* make sure i am the only one in this fs */
- si_write_lock(sb, AuLock_FLUSH);
- if (au_opt_test(au_mntflags(sb), PLINK)) {
- spin_lock(&sbinfo->si_plink_maint_lock);
- if (!sbinfo->si_plink_maint_pid)
- sbinfo->si_plink_maint_pid = current->pid;
- else
- err = -EBUSY;
- spin_unlock(&sbinfo->si_plink_maint_lock);
- }
- si_write_unlock(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_DEBUG
-void au_plink_list(struct super_block *sb)
-{
- int i;
- struct au_sbinfo *sbinfo;
- struct hlist_head *plink_hlist;
- struct au_icntnr *icntnr;
-
- SiMustAnyLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
- AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-
- for (i = 0; i < AuPlink_NHASH; i++) {
- plink_hlist = &sbinfo->si_plink[i].head;
- rcu_read_lock();
- hlist_for_each_entry_rcu(icntnr, plink_hlist, plink)
- AuDbg("%lu\n", icntnr->vfs_inode.i_ino);
- rcu_read_unlock();
- }
-}
-#endif
-
-/* is the inode pseudo-linked? */
-int au_plink_test(struct inode *inode)
-{
- int found, i;
- struct au_sbinfo *sbinfo;
- struct hlist_head *plink_hlist;
- struct au_icntnr *icntnr;
-
- sbinfo = au_sbi(inode->i_sb);
- AuRwMustAnyLock(&sbinfo->si_rwsem);
- AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK));
- AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
-
- found = 0;
- i = au_plink_hash(inode->i_ino);
- plink_hlist = &sbinfo->si_plink[i].head;
- rcu_read_lock();
- hlist_for_each_entry_rcu(icntnr, plink_hlist, plink)
- if (&icntnr->vfs_inode == inode) {
- found = 1;
- break;
- }
- rcu_read_unlock();
- return found;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * generate a name for plink.
- * the file will be stored under AUFS_WH_PLINKDIR.
- */
-/* 20 is max digits length of ulong 64 */
-#define PLINK_NAME_LEN ((20 + 1) * 2)
-
-static int plink_name(char *name, int len, struct inode *inode,
- aufs_bindex_t bindex)
-{
- int rlen;
- struct inode *h_inode;
-
- h_inode = au_h_iptr(inode, bindex);
- rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
- return rlen;
-}
-
-struct au_do_plink_lkup_args {
- struct dentry **errp;
- struct qstr *tgtname;
- struct dentry *h_parent;
- struct au_branch *br;
-};
-
-static struct dentry *au_do_plink_lkup(struct qstr *tgtname,
- struct dentry *h_parent,
- struct au_branch *br)
-{
- struct dentry *h_dentry;
- struct inode *h_inode;
-
- h_inode = d_inode(h_parent);
- inode_lock_nested(h_inode, AuLsc_I_CHILD2);
- h_dentry = vfsub_lkup_one(tgtname, h_parent);
- inode_unlock(h_inode);
- return h_dentry;
-}
-
-static void au_call_do_plink_lkup(void *args)
-{
- struct au_do_plink_lkup_args *a = args;
- *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br);
-}
-
-/* lookup the plink-ed @inode under the branch at @bindex */
-struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex)
-{
- struct dentry *h_dentry, *h_parent;
- struct au_branch *br;
- int wkq_err;
- char a[PLINK_NAME_LEN];
- struct qstr tgtname = QSTR_INIT(a, 0);
-
- AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
-
- br = au_sbr(inode->i_sb, bindex);
- h_parent = br->br_wbr->wbr_plink;
- tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-
- if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) {
- struct au_do_plink_lkup_args args = {
- .errp = &h_dentry,
- .tgtname = &tgtname,
- .h_parent = h_parent,
- .br = br
- };
-
- wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args);
- if (unlikely(wkq_err))
- h_dentry = ERR_PTR(wkq_err);
- } else
- h_dentry = au_do_plink_lkup(&tgtname, h_parent, br);
-
- return h_dentry;
-}
-
-/* create a pseudo-link */
-static int do_whplink(struct qstr *tgt, struct dentry *h_parent,
- struct dentry *h_dentry, struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = au_br_mnt(br)
- };
- struct inode *h_dir, *delegated;
-
- h_dir = d_inode(h_parent);
- inode_lock_nested(h_dir, AuLsc_I_CHILD2);
-again:
- h_path.dentry = vfsub_lkup_one(tgt, h_parent);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- err = 0;
- /* wh.plink dir is not monitored */
- /* todo: is it really safe? */
- if (d_is_positive(h_path.dentry)
- && d_inode(h_path.dentry) != d_inode(h_dentry)) {
- delegated = NULL;
- err = vfsub_unlink(h_dir, &h_path, &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- dput(h_path.dentry);
- h_path.dentry = NULL;
- if (!err)
- goto again;
- }
- if (!err && d_is_negative(h_path.dentry)) {
- delegated = NULL;
- err = vfsub_link(h_dentry, h_dir, &h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- }
- dput(h_path.dentry);
-
-out:
- inode_unlock(h_dir);
- return err;
-}
-
-struct do_whplink_args {
- int *errp;
- struct qstr *tgt;
- struct dentry *h_parent;
- struct dentry *h_dentry;
- struct au_branch *br;
-};
-
-static void call_do_whplink(void *args)
-{
- struct do_whplink_args *a = args;
- *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br);
-}
-
-static int whplink(struct dentry *h_dentry, struct inode *inode,
- aufs_bindex_t bindex, struct au_branch *br)
-{
- int err, wkq_err;
- struct au_wbr *wbr;
- struct dentry *h_parent;
- char a[PLINK_NAME_LEN];
- struct qstr tgtname = QSTR_INIT(a, 0);
-
- wbr = au_sbr(inode->i_sb, bindex)->br_wbr;
- h_parent = wbr->wbr_plink;
- tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-
- /* always superio. */
- if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) {
- struct do_whplink_args args = {
- .errp = &err,
- .tgt = &tgtname,
- .h_parent = h_parent,
- .h_dentry = h_dentry,
- .br = br
- };
- wkq_err = au_wkq_wait(call_do_whplink, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- } else
- err = do_whplink(&tgtname, h_parent, h_dentry, br);
-
- return err;
-}
-
-/*
- * create a new pseudo-link for @h_dentry on @bindex.
- * the linked inode is held in aufs @inode.
- */
-void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
- struct dentry *h_dentry)
-{
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
- struct hlist_head *plink_hlist;
- struct au_icntnr *icntnr;
- struct au_sphlhead *sphl;
- int found, err, cnt, i;
-
- sb = inode->i_sb;
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
- AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-
- found = au_plink_test(inode);
- if (found)
- return;
-
- i = au_plink_hash(inode->i_ino);
- sphl = sbinfo->si_plink + i;
- plink_hlist = &sphl->head;
- au_igrab(inode);
-
- spin_lock(&sphl->spin);
- hlist_for_each_entry(icntnr, plink_hlist, plink) {
- if (&icntnr->vfs_inode == inode) {
- found = 1;
- break;
- }
- }
- if (!found) {
- icntnr = container_of(inode, struct au_icntnr, vfs_inode);
- hlist_add_head_rcu(&icntnr->plink, plink_hlist);
- }
- spin_unlock(&sphl->spin);
- if (!found) {
- cnt = au_sphl_count(sphl);
-#define msg "unexpectedly unblanced or too many pseudo-links"
- if (cnt > AUFS_PLINK_WARN)
- AuWarn1(msg ", %d\n", cnt);
-#undef msg
- err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex));
- if (unlikely(err)) {
- pr_warn("err %d, damaged pseudo link.\n", err);
- au_sphl_del_rcu(&icntnr->plink, sphl);
- iput(&icntnr->vfs_inode);
- }
- } else
- iput(&icntnr->vfs_inode);
-}
-
-/* free all plinks */
-void au_plink_put(struct super_block *sb, int verbose)
-{
- int i, warned;
- struct au_sbinfo *sbinfo;
- struct hlist_head *plink_hlist;
- struct hlist_node *tmp;
- struct au_icntnr *icntnr;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
- AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-
- /* no spin_lock since sbinfo is write-locked */
- warned = 0;
- for (i = 0; i < AuPlink_NHASH; i++) {
- plink_hlist = &sbinfo->si_plink[i].head;
- if (!warned && verbose && !hlist_empty(plink_hlist)) {
- pr_warn("pseudo-link is not flushed");
- warned = 1;
- }
- hlist_for_each_entry_safe(icntnr, tmp, plink_hlist, plink)
- iput(&icntnr->vfs_inode);
- INIT_HLIST_HEAD(plink_hlist);
- }
-}
-
-void au_plink_clean(struct super_block *sb, int verbose)
-{
- struct dentry *root;
-
- root = sb->s_root;
- aufs_write_lock(root);
- if (au_opt_test(au_mntflags(sb), PLINK))
- au_plink_put(sb, verbose);
- aufs_write_unlock(root);
-}
-
-static int au_plink_do_half_refresh(struct inode *inode, aufs_bindex_t br_id)
-{
- int do_put;
- aufs_bindex_t btop, bbot, bindex;
-
- do_put = 0;
- btop = au_ibtop(inode);
- bbot = au_ibbot(inode);
- if (btop >= 0) {
- for (bindex = btop; bindex <= bbot; bindex++) {
- if (!au_h_iptr(inode, bindex)
- || au_ii_br_id(inode, bindex) != br_id)
- continue;
- au_set_h_iptr(inode, bindex, NULL, 0);
- do_put = 1;
- break;
- }
- if (do_put)
- for (bindex = btop; bindex <= bbot; bindex++)
- if (au_h_iptr(inode, bindex)) {
- do_put = 0;
- break;
- }
- } else
- do_put = 1;
-
- return do_put;
-}
-
-/* free the plinks on a branch specified by @br_id */
-void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id)
-{
- struct au_sbinfo *sbinfo;
- struct hlist_head *plink_hlist;
- struct hlist_node *tmp;
- struct au_icntnr *icntnr;
- struct inode *inode;
- int i, do_put;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
- AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-
- /* no spin_lock since sbinfo is write-locked */
- for (i = 0; i < AuPlink_NHASH; i++) {
- plink_hlist = &sbinfo->si_plink[i].head;
- hlist_for_each_entry_safe(icntnr, tmp, plink_hlist, plink) {
- inode = au_igrab(&icntnr->vfs_inode);
- ii_write_lock_child(inode);
- do_put = au_plink_do_half_refresh(inode, br_id);
- if (do_put) {
- hlist_del(&icntnr->plink);
- iput(inode);
- }
- ii_write_unlock(inode);
- iput(inode);
- }
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * poll operation
- * There is only one filesystem which implements ->poll operation, currently.
- */
-
-#include "aufs.h"
-
-unsigned int aufs_poll(struct file *file, poll_table *wait)
-{
- unsigned int mask;
- int err;
- struct file *h_file;
- struct super_block *sb;
-
- /* We should pretend an error happened. */
- mask = POLLERR /* | POLLIN | POLLOUT */;
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-
- h_file = au_read_pre(file, /*keep_fi*/0);
- err = PTR_ERR(h_file);
- if (IS_ERR(h_file))
- goto out;
-
- /* it is not an error if h_file has no operation */
- mask = DEFAULT_POLLMASK;
- if (h_file->f_op->poll)
- mask = h_file->f_op->poll(h_file, wait);
- fput(h_file); /* instead of au_read_post() */
-
-out:
- si_read_unlock(sb);
- AuTraceErr((int)mask);
- return mask;
-}
+++ /dev/null
-/*
- * Copyright (C) 2014-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * posix acl operations
- */
-
-#include <linux/fs.h>
-#include "aufs.h"
-
-struct posix_acl *aufs_get_acl(struct inode *inode, int type)
-{
- struct posix_acl *acl;
- int err;
- aufs_bindex_t bindex;
- struct inode *h_inode;
- struct super_block *sb;
-
- acl = NULL;
- sb = inode->i_sb;
- si_read_lock(sb, AuLock_FLUSH);
- ii_read_lock_child(inode);
- if (!(sb->s_flags & MS_POSIXACL))
- goto out;
-
- bindex = au_ibtop(inode);
- h_inode = au_h_iptr(inode, bindex);
- if (unlikely(!h_inode
- || ((h_inode->i_mode & S_IFMT)
- != (inode->i_mode & S_IFMT)))) {
- err = au_busy_or_stale();
- acl = ERR_PTR(err);
- goto out;
- }
-
- /* always topmost only */
- acl = get_acl(h_inode, type);
-
-out:
- ii_read_unlock(inode);
- si_read_unlock(sb);
-
- AuTraceErrPtr(acl);
- return acl;
-}
-
-int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
-{
- int err;
- ssize_t ssz;
- struct dentry *dentry;
- struct au_srxattr arg = {
- .type = AU_ACL_SET,
- .u.acl_set = {
- .acl = acl,
- .type = type
- },
- };
-
- IMustLock(inode);
-
- if (inode->i_ino == AUFS_ROOT_INO)
- dentry = dget(inode->i_sb->s_root);
- else {
- dentry = d_find_alias(inode);
- if (!dentry)
- dentry = d_find_any_alias(inode);
- if (!dentry) {
- pr_warn("cannot handle this inode, "
- "please report to aufs-users ML\n");
- err = -ENOENT;
- goto out;
- }
- }
-
- ssz = au_srxattr(dentry, inode, &arg);
- dput(dentry);
- err = ssz;
- if (ssz >= 0)
- err = 0;
-
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2010-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * procfs interfaces
- */
-
-#include <linux/proc_fs.h>
-#include "aufs.h"
-
-static int au_procfs_plm_release(struct inode *inode, struct file *file)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = file->private_data;
- if (sbinfo) {
- au_plink_maint_leave(sbinfo);
- kobject_put(&sbinfo->si_kobj);
- }
-
- return 0;
-}
-
-static void au_procfs_plm_write_clean(struct file *file)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = file->private_data;
- if (sbinfo)
- au_plink_clean(sbinfo->si_sb, /*verbose*/0);
-}
-
-static int au_procfs_plm_write_si(struct file *file, unsigned long id)
-{
- int err;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- err = -EBUSY;
- if (unlikely(file->private_data))
- goto out;
-
- sb = NULL;
- /* don't use au_sbilist_lock() here */
- spin_lock(&au_sbilist.spin);
- hlist_for_each_entry(sbinfo, &au_sbilist.head, si_list)
- if (id == sysaufs_si_id(sbinfo)) {
- kobject_get(&sbinfo->si_kobj);
- sb = sbinfo->si_sb;
- break;
- }
- spin_unlock(&au_sbilist.spin);
-
- err = -EINVAL;
- if (unlikely(!sb))
- goto out;
-
- err = au_plink_maint_enter(sb);
- if (!err)
- /* keep kobject_get() */
- file->private_data = sbinfo;
- else
- kobject_put(&sbinfo->si_kobj);
-out:
- return err;
-}
-
-/*
- * Accept a valid "si=xxxx" only.
- * Once it is accepted successfully, accept "clean" too.
- */
-static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf,
- size_t count, loff_t *ppos)
-{
- ssize_t err;
- unsigned long id;
- /* last newline is allowed */
- char buf[3 + sizeof(unsigned long) * 2 + 1];
-
- err = -EACCES;
- if (unlikely(!capable(CAP_SYS_ADMIN)))
- goto out;
-
- err = -EINVAL;
- if (unlikely(count > sizeof(buf)))
- goto out;
-
- err = copy_from_user(buf, ubuf, count);
- if (unlikely(err)) {
- err = -EFAULT;
- goto out;
- }
- buf[count] = 0;
-
- err = -EINVAL;
- if (!strcmp("clean", buf)) {
- au_procfs_plm_write_clean(file);
- goto out_success;
- } else if (unlikely(strncmp("si=", buf, 3)))
- goto out;
-
- err = kstrtoul(buf + 3, 16, &id);
- if (unlikely(err))
- goto out;
-
- err = au_procfs_plm_write_si(file, id);
- if (unlikely(err))
- goto out;
-
-out_success:
- err = count; /* success */
-out:
- return err;
-}
-
-static const struct file_operations au_procfs_plm_fop = {
- .write = au_procfs_plm_write,
- .release = au_procfs_plm_release,
- .owner = THIS_MODULE
-};
-
-/* ---------------------------------------------------------------------- */
-
-static struct proc_dir_entry *au_procfs_dir;
-
-void au_procfs_fin(void)
-{
- remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir);
- remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
-}
-
-int __init au_procfs_init(void)
-{
- int err;
- struct proc_dir_entry *entry;
-
- err = -ENOMEM;
- au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL);
- if (unlikely(!au_procfs_dir))
- goto out;
-
- entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | S_IWUSR,
- au_procfs_dir, &au_procfs_plm_fop);
- if (unlikely(!entry))
- goto out_dir;
-
- err = 0;
- goto out; /* success */
-
-
-out_dir:
- remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * readdir in userspace.
- */
-
-#include <linux/compat.h>
-#include <linux/fs_stack.h>
-#include <linux/security.h>
-#include "aufs.h"
-
-/* bits for struct aufs_rdu.flags */
-#define AuRdu_CALLED 1
-#define AuRdu_CONT (1 << 1)
-#define AuRdu_FULL (1 << 2)
-#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name)
-#define au_fset_rdu(flags, name) \
- do { (flags) |= AuRdu_##name; } while (0)
-#define au_fclr_rdu(flags, name) \
- do { (flags) &= ~AuRdu_##name; } while (0)
-
-struct au_rdu_arg {
- struct dir_context ctx;
- struct aufs_rdu *rdu;
- union au_rdu_ent_ul ent;
- unsigned long end;
-
- struct super_block *sb;
- int err;
-};
-
-static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen,
- loff_t offset, u64 h_ino, unsigned int d_type)
-{
- int err, len;
- struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx);
- struct aufs_rdu *rdu = arg->rdu;
- struct au_rdu_ent ent;
-
- err = 0;
- arg->err = 0;
- au_fset_rdu(rdu->cookie.flags, CALLED);
- len = au_rdu_len(nlen);
- if (arg->ent.ul + len < arg->end) {
- ent.ino = h_ino;
- ent.bindex = rdu->cookie.bindex;
- ent.type = d_type;
- ent.nlen = nlen;
- if (unlikely(nlen > AUFS_MAX_NAMELEN))
- ent.type = DT_UNKNOWN;
-
- /* unnecessary to support mmap_sem since this is a dir */
- err = -EFAULT;
- if (copy_to_user(arg->ent.e, &ent, sizeof(ent)))
- goto out;
- if (copy_to_user(arg->ent.e->name, name, nlen))
- goto out;
- /* the terminating NULL */
- if (__put_user(0, arg->ent.e->name + nlen))
- goto out;
- err = 0;
- /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */
- arg->ent.ul += len;
- rdu->rent++;
- } else {
- err = -EFAULT;
- au_fset_rdu(rdu->cookie.flags, FULL);
- rdu->full = 1;
- rdu->tail = arg->ent;
- }
-
-out:
- /* AuTraceErr(err); */
- return err;
-}
-
-static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg)
-{
- int err;
- loff_t offset;
- struct au_rdu_cookie *cookie = &arg->rdu->cookie;
-
- /* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */
- offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET);
- err = offset;
- if (unlikely(offset != cookie->h_pos))
- goto out;
-
- err = 0;
- do {
- arg->err = 0;
- au_fclr_rdu(cookie->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_iterate_dir(h_file, &arg->ctx);
- if (err >= 0)
- err = arg->err;
- } while (!err
- && au_ftest_rdu(cookie->flags, CALLED)
- && !au_ftest_rdu(cookie->flags, FULL));
- cookie->h_pos = h_file->f_pos;
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_rdu(struct file *file, struct aufs_rdu *rdu)
-{
- int err;
- aufs_bindex_t bbot;
- struct au_rdu_arg arg = {
- .ctx = {
- .actor = au_rdu_fill
- }
- };
- struct dentry *dentry;
- struct inode *inode;
- struct file *h_file;
- struct au_rdu_cookie *cookie = &rdu->cookie;
-
- err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
- rdu->rent = 0;
- rdu->tail = rdu->ent;
- rdu->full = 0;
- arg.rdu = rdu;
- arg.ent = rdu->ent;
- arg.end = arg.ent.ul;
- arg.end += rdu->sz;
-
- err = -ENOTDIR;
- if (unlikely(!file->f_op->iterate && !file->f_op->iterate_shared))
- goto out;
-
- err = security_file_permission(file, MAY_READ);
- AuTraceErr(err);
- if (unlikely(err))
- goto out;
-
- dentry = file->f_path.dentry;
- inode = d_inode(dentry);
- inode_lock_shared(inode);
-
- arg.sb = inode->i_sb;
- err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out_mtx;
- err = au_alive_dir(dentry);
- if (unlikely(err))
- goto out_si;
- /* todo: reval? */
- fi_read_lock(file);
-
- err = -EAGAIN;
- if (unlikely(au_ftest_rdu(cookie->flags, CONT)
- && cookie->generation != au_figen(file)))
- goto out_unlock;
-
- err = 0;
- if (!rdu->blk) {
- rdu->blk = au_sbi(arg.sb)->si_rdblk;
- if (!rdu->blk)
- rdu->blk = au_dir_size(file, /*dentry*/NULL);
- }
- bbot = au_fbtop(file);
- if (cookie->bindex < bbot)
- cookie->bindex = bbot;
- bbot = au_fbbot_dir(file);
- /* AuDbg("b%d, b%d\n", cookie->bindex, bbot); */
- for (; !err && cookie->bindex <= bbot;
- cookie->bindex++, cookie->h_pos = 0) {
- h_file = au_hf_dir(file, cookie->bindex);
- if (!h_file)
- continue;
-
- au_fclr_rdu(cookie->flags, FULL);
- err = au_rdu_do(h_file, &arg);
- AuTraceErr(err);
- if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
- break;
- }
- AuDbg("rent %llu\n", rdu->rent);
-
- if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
- rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
- au_fset_rdu(cookie->flags, CONT);
- cookie->generation = au_figen(file);
- }
-
- ii_read_lock_child(inode);
- fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibtop(inode)));
- ii_read_unlock(inode);
-
-out_unlock:
- fi_read_unlock(file);
-out_si:
- si_read_unlock(arg.sb);
-out_mtx:
- inode_unlock_shared(inode);
-out:
- AuTraceErr(err);
- return err;
-}
-
-static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu)
-{
- int err;
- ino_t ino;
- unsigned long long nent;
- union au_rdu_ent_ul *u;
- struct au_rdu_ent ent;
- struct super_block *sb;
-
- err = 0;
- nent = rdu->nent;
- u = &rdu->ent;
- sb = file->f_path.dentry->d_sb;
- si_read_lock(sb, AuLock_FLUSH);
- while (nent-- > 0) {
- /* unnecessary to support mmap_sem since this is a dir */
- err = copy_from_user(&ent, u->e, sizeof(ent));
- if (!err)
- err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- break;
- }
-
- /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */
- if (!ent.wh)
- err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino);
- else
- err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type,
- &ino);
- if (unlikely(err)) {
- AuTraceErr(err);
- break;
- }
-
- err = __put_user(ino, &u->e->ino);
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- break;
- }
- u->ul += au_rdu_len(ent.nlen);
- }
- si_read_unlock(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_rdu_verify(struct aufs_rdu *rdu)
-{
- AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | "
- "%llu, b%d, 0x%x, g%u}\n",
- rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ],
- rdu->blk,
- rdu->rent, rdu->shwh, rdu->full,
- rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags,
- rdu->cookie.generation);
-
- if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu))
- return 0;
-
- AuDbg("%u:%u\n",
- rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu));
- return -EINVAL;
-}
-
-long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err, e;
- struct aufs_rdu rdu;
- void __user *p = (void __user *)arg;
-
- err = copy_from_user(&rdu, p, sizeof(rdu));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
- err = au_rdu_verify(&rdu);
- if (unlikely(err))
- goto out;
-
- switch (cmd) {
- case AUFS_CTL_RDU:
- err = au_rdu(file, &rdu);
- if (unlikely(err))
- break;
-
- e = copy_to_user(p, &rdu, sizeof(rdu));
- if (unlikely(e)) {
- err = -EFAULT;
- AuTraceErr(err);
- }
- break;
- case AUFS_CTL_RDU_INO:
- err = au_rdu_ino(file, &rdu);
- break;
-
- default:
- /* err = -ENOTTY; */
- err = -EINVAL;
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-#ifdef CONFIG_COMPAT
-long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- long err, e;
- struct aufs_rdu rdu;
- void __user *p = compat_ptr(arg);
-
- /* todo: get_user()? */
- err = copy_from_user(&rdu, p, sizeof(rdu));
- if (unlikely(err)) {
- err = -EFAULT;
- AuTraceErr(err);
- goto out;
- }
- rdu.ent.e = compat_ptr(rdu.ent.ul);
- err = au_rdu_verify(&rdu);
- if (unlikely(err))
- goto out;
-
- switch (cmd) {
- case AUFS_CTL_RDU:
- err = au_rdu(file, &rdu);
- if (unlikely(err))
- break;
-
- rdu.ent.ul = ptr_to_compat(rdu.ent.e);
- rdu.tail.ul = ptr_to_compat(rdu.tail.e);
- e = copy_to_user(p, &rdu, sizeof(rdu));
- if (unlikely(e)) {
- err = -EFAULT;
- AuTraceErr(err);
- }
- break;
- case AUFS_CTL_RDU_INO:
- err = au_rdu_ino(file, &rdu);
- break;
-
- default:
- /* err = -ENOTTY; */
- err = -EINVAL;
- }
-
-out:
- AuTraceErr(err);
- return err;
-}
-#endif
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * simple read-write semaphore wrappers
- */
-
-#ifndef __AUFS_RWSEM_H__
-#define __AUFS_RWSEM_H__
-
-#ifdef __KERNEL__
-
-#include "debug.h"
-
-struct au_rwsem {
- struct rw_semaphore rwsem;
-#ifdef CONFIG_AUFS_DEBUG
- /* just for debugging, not almighty counter */
- atomic_t rcnt, wcnt;
-#endif
-};
-
-#ifdef CONFIG_LOCKDEP
-#define au_lockdep_set_name(rw) \
- lockdep_set_class_and_name(&(rw)->rwsem, \
- /*original key*/(rw)->rwsem.dep_map.key, \
- /*name*/#rw)
-#else
-#define au_lockdep_set_name(rw) do {} while (0)
-#endif
-
-#ifdef CONFIG_AUFS_DEBUG
-#define AuDbgCntInit(rw) do { \
- atomic_set(&(rw)->rcnt, 0); \
- atomic_set(&(rw)->wcnt, 0); \
- smp_mb(); /* atomic set */ \
-} while (0)
-
-#define AuDbgCnt(rw, cnt) atomic_read(&(rw)->cnt)
-#define AuDbgCntInc(rw, cnt) atomic_inc(&(rw)->cnt)
-#define AuDbgCntDec(rw, cnt) WARN_ON(atomic_dec_return(&(rw)->cnt) < 0)
-#define AuDbgRcntInc(rw) AuDbgCntInc(rw, rcnt)
-#define AuDbgRcntDec(rw) AuDbgCntDec(rw, rcnt)
-#define AuDbgWcntInc(rw) AuDbgCntInc(rw, wcnt)
-#define AuDbgWcntDec(rw) AuDbgCntDec(rw, wcnt)
-#else
-#define AuDbgCnt(rw, cnt) 0
-#define AuDbgCntInit(rw) do {} while (0)
-#define AuDbgRcntInc(rw) do {} while (0)
-#define AuDbgRcntDec(rw) do {} while (0)
-#define AuDbgWcntInc(rw) do {} while (0)
-#define AuDbgWcntDec(rw) do {} while (0)
-#endif /* CONFIG_AUFS_DEBUG */
-
-/* to debug easier, do not make them inlined functions */
-#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(&(rw)->rwsem))
-/* rwsem_is_locked() is unusable */
-#define AuRwMustReadLock(rw) AuDebugOn(AuDbgCnt(rw, rcnt) <= 0)
-#define AuRwMustWriteLock(rw) AuDebugOn(AuDbgCnt(rw, wcnt) <= 0)
-#define AuRwMustAnyLock(rw) AuDebugOn(AuDbgCnt(rw, rcnt) <= 0 \
- && AuDbgCnt(rw, wcnt) <= 0)
-#define AuRwDestroy(rw) AuDebugOn(AuDbgCnt(rw, rcnt) \
- || AuDbgCnt(rw, wcnt))
-
-#define au_rw_init(rw) do { \
- AuDbgCntInit(rw); \
- init_rwsem(&(rw)->rwsem); \
- au_lockdep_set_name(rw); \
- } while (0)
-
-#define au_rw_init_wlock(rw) do { \
- au_rw_init(rw); \
- down_write(&(rw)->rwsem); \
- AuDbgWcntInc(rw); \
- } while (0)
-
-#define au_rw_init_wlock_nested(rw, lsc) do { \
- au_rw_init(rw); \
- down_write_nested(&(rw)->rwsem, lsc); \
- AuDbgWcntInc(rw); \
- } while (0)
-
-static inline void au_rw_read_lock(struct au_rwsem *rw)
-{
- down_read(&rw->rwsem);
- AuDbgRcntInc(rw);
-}
-
-static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc)
-{
- down_read_nested(&rw->rwsem, lsc);
- AuDbgRcntInc(rw);
-}
-
-static inline void au_rw_read_unlock(struct au_rwsem *rw)
-{
- AuRwMustReadLock(rw);
- AuDbgRcntDec(rw);
- up_read(&rw->rwsem);
-}
-
-static inline void au_rw_dgrade_lock(struct au_rwsem *rw)
-{
- AuRwMustWriteLock(rw);
- AuDbgRcntInc(rw);
- AuDbgWcntDec(rw);
- downgrade_write(&rw->rwsem);
-}
-
-static inline void au_rw_write_lock(struct au_rwsem *rw)
-{
- down_write(&rw->rwsem);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_write_lock_nested(struct au_rwsem *rw,
- unsigned int lsc)
-{
- down_write_nested(&rw->rwsem, lsc);
- AuDbgWcntInc(rw);
-}
-
-static inline void au_rw_write_unlock(struct au_rwsem *rw)
-{
- AuRwMustWriteLock(rw);
- AuDbgWcntDec(rw);
- up_write(&rw->rwsem);
-}
-
-/* why is not _nested version defined */
-static inline int au_rw_read_trylock(struct au_rwsem *rw)
-{
- int ret;
-
- ret = down_read_trylock(&rw->rwsem);
- if (ret)
- AuDbgRcntInc(rw);
- return ret;
-}
-
-static inline int au_rw_write_trylock(struct au_rwsem *rw)
-{
- int ret;
-
- ret = down_write_trylock(&rw->rwsem);
- if (ret)
- AuDbgWcntInc(rw);
- return ret;
-}
-
-#undef AuDbgCntDec
-#undef AuDbgRcntInc
-#undef AuDbgRcntDec
-#undef AuDbgWcntDec
-
-#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
-static inline void prefix##_read_lock(param) \
-{ au_rw_read_lock(rwsem); } \
-static inline void prefix##_write_lock(param) \
-{ au_rw_write_lock(rwsem); } \
-static inline int prefix##_read_trylock(param) \
-{ return au_rw_read_trylock(rwsem); } \
-static inline int prefix##_write_trylock(param) \
-{ return au_rw_write_trylock(rwsem); }
-/* why is not _nested version defined */
-/* static inline void prefix##_read_trylock_nested(param, lsc)
-{ au_rw_read_trylock_nested(rwsem, lsc)); }
-static inline void prefix##_write_trylock_nestd(param, lsc)
-{ au_rw_write_trylock_nested(rwsem, lsc); } */
-
-#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \
-static inline void prefix##_read_unlock(param) \
-{ au_rw_read_unlock(rwsem); } \
-static inline void prefix##_write_unlock(param) \
-{ au_rw_write_unlock(rwsem); } \
-static inline void prefix##_downgrade_lock(param) \
-{ au_rw_dgrade_lock(rwsem); }
-
-#define AuSimpleRwsemFuncs(prefix, param, rwsem) \
- AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
- AuSimpleUnlockRwsemFuncs(prefix, param, rwsem)
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_RWSEM_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * superblock private data
- */
-
-#include "aufs.h"
-
-/*
- * they are necessary regardless sysfs is disabled.
- */
-void au_si_free(struct kobject *kobj)
-{
- int i;
- struct au_sbinfo *sbinfo;
- char *locked __maybe_unused; /* debug only */
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- for (i = 0; i < AuPlink_NHASH; i++)
- AuDebugOn(!hlist_empty(&sbinfo->si_plink[i].head));
- AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len));
-
- AuDebugOn(percpu_counter_sum(&sbinfo->si_ninodes));
- percpu_counter_destroy(&sbinfo->si_ninodes);
- AuDebugOn(percpu_counter_sum(&sbinfo->si_nfiles));
- percpu_counter_destroy(&sbinfo->si_nfiles);
-
- au_rw_write_lock(&sbinfo->si_rwsem);
- au_br_free(sbinfo);
- au_rw_write_unlock(&sbinfo->si_rwsem);
-
- au_delayed_kfree(sbinfo->si_branch);
- for (i = 0; i < AU_NPIDMAP; i++)
- if (sbinfo->au_si_pid.pid_bitmap[i])
- au_delayed_kfree(sbinfo->au_si_pid.pid_bitmap[i]);
- mutex_destroy(&sbinfo->au_si_pid.pid_mtx);
- mutex_destroy(&sbinfo->si_xib_mtx);
- AuRwDestroy(&sbinfo->si_rwsem);
-
- au_delayed_kfree(sbinfo);
-}
-
-int au_si_alloc(struct super_block *sb)
-{
- int err, i;
- struct au_sbinfo *sbinfo;
-
- err = -ENOMEM;
- sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
- if (unlikely(!sbinfo))
- goto out;
-
- /* will be reallocated separately */
- sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
- if (unlikely(!sbinfo->si_branch))
- goto out_sbinfo;
-
- err = sysaufs_si_init(sbinfo);
- if (unlikely(err))
- goto out_br;
-
- au_nwt_init(&sbinfo->si_nowait);
- au_rw_init_wlock(&sbinfo->si_rwsem);
- mutex_init(&sbinfo->au_si_pid.pid_mtx);
-
- percpu_counter_init(&sbinfo->si_ninodes, 0, GFP_NOFS);
- percpu_counter_init(&sbinfo->si_nfiles, 0, GFP_NOFS);
-
- sbinfo->si_bbot = -1;
- sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2;
-
- sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
- sbinfo->si_wbr_create = AuWbrCreate_Def;
- sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
- sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;
-
- au_fhsm_init(sbinfo);
-
- sbinfo->si_mntflags = au_opts_plink(AuOpt_Def);
-
- sbinfo->si_xino_jiffy = jiffies;
- sbinfo->si_xino_expire
- = msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC);
- mutex_init(&sbinfo->si_xib_mtx);
- sbinfo->si_xino_brid = -1;
- /* leave si_xib_last_pindex and si_xib_next_bit */
-
- au_sphl_init(&sbinfo->si_aopen);
-
- sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC);
- sbinfo->si_rdblk = AUFS_RDBLK_DEF;
- sbinfo->si_rdhash = AUFS_RDHASH_DEF;
- sbinfo->si_dirwh = AUFS_DIRWH_DEF;
-
- for (i = 0; i < AuPlink_NHASH; i++)
- au_sphl_init(sbinfo->si_plink + i);
- init_waitqueue_head(&sbinfo->si_plink_wq);
- spin_lock_init(&sbinfo->si_plink_maint_lock);
-
- au_sphl_init(&sbinfo->si_files);
-
- /* with getattr by default */
- sbinfo->si_iop_array = aufs_iop;
-
- /* leave other members for sysaufs and si_mnt. */
- sbinfo->si_sb = sb;
- sb->s_fs_info = sbinfo;
- si_pid_set(sb);
- return 0; /* success */
-
-out_br:
- au_delayed_kfree(sbinfo->si_branch);
-out_sbinfo:
- au_delayed_kfree(sbinfo);
-out:
- return err;
-}
-
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink)
-{
- int err, sz;
- struct au_branch **brp;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*brp) * (sbinfo->si_bbot + 1);
- if (unlikely(!sz))
- sz = sizeof(*brp);
- brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS,
- may_shrink);
- if (brp) {
- sbinfo->si_branch = brp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-unsigned int au_sigen_inc(struct super_block *sb)
-{
- unsigned int gen;
- struct inode *inode;
-
- SiMustWriteLock(sb);
-
- gen = ++au_sbi(sb)->si_generation;
- au_update_digen(sb->s_root);
- inode = d_inode(sb->s_root);
- au_update_iigen(inode, /*half*/0);
- inode->i_version++;
- return gen;
-}
-
-aufs_bindex_t au_new_br_id(struct super_block *sb)
-{
- aufs_bindex_t br_id;
- int i;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
- br_id = ++sbinfo->si_last_br_id;
- AuDebugOn(br_id < 0);
- if (br_id && au_br_index(sb, br_id) < 0)
- return br_id;
- }
-
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* it is ok that new 'nwt' tasks are appended while we are sleeping */
-int si_read_lock(struct super_block *sb, int flags)
-{
- int err;
-
- err = 0;
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
-
- si_noflush_read_lock(sb);
- err = au_plink_maint(sb, flags);
- if (unlikely(err))
- si_read_unlock(sb);
-
- return err;
-}
-
-int si_write_lock(struct super_block *sb, int flags)
-{
- int err;
-
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
-
- si_noflush_write_lock(sb);
- err = au_plink_maint(sb, flags);
- if (unlikely(err))
- si_write_unlock(sb);
-
- return err;
-}
-
-/* dentry and super_block lock. call at entry point */
-int aufs_read_lock(struct dentry *dentry, int flags)
-{
- int err;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- err = si_read_lock(sb, flags);
- if (unlikely(err))
- goto out;
-
- if (au_ftest_lock(flags, DW))
- di_write_lock_child(dentry);
- else
- di_read_lock_child(dentry, flags);
-
- if (au_ftest_lock(flags, GEN)) {
- err = au_digen_test(dentry, au_sigen(sb));
- if (!au_opt_test(au_mntflags(sb), UDBA_NONE))
- AuDebugOn(!err && au_dbrange_test(dentry));
- else if (!err)
- err = au_dbrange_test(dentry);
- if (unlikely(err))
- aufs_read_unlock(dentry, flags);
- }
-
-out:
- return err;
-}
-
-void aufs_read_unlock(struct dentry *dentry, int flags)
-{
- if (au_ftest_lock(flags, DW))
- di_write_unlock(dentry);
- else
- di_read_unlock(dentry, flags);
- si_read_unlock(dentry->d_sb);
-}
-
-void aufs_write_lock(struct dentry *dentry)
-{
- si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW);
- di_write_lock_child(dentry);
-}
-
-void aufs_write_unlock(struct dentry *dentry)
-{
- di_write_unlock(dentry);
- si_write_unlock(dentry->d_sb);
-}
-
-int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
-{
- int err;
- unsigned int sigen;
- struct super_block *sb;
-
- sb = d1->d_sb;
- err = si_read_lock(sb, flags);
- if (unlikely(err))
- goto out;
-
- di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIRS));
-
- if (au_ftest_lock(flags, GEN)) {
- sigen = au_sigen(sb);
- err = au_digen_test(d1, sigen);
- AuDebugOn(!err && au_dbrange_test(d1));
- if (!err) {
- err = au_digen_test(d2, sigen);
- AuDebugOn(!err && au_dbrange_test(d2));
- }
- if (unlikely(err))
- aufs_read_and_write_unlock2(d1, d2);
- }
-
-out:
- return err;
-}
-
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock2(d1, d2);
- si_read_unlock(d1->d_sb);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void si_pid_alloc(struct au_si_pid *au_si_pid, int idx)
-{
- unsigned long *p;
-
- BUILD_BUG_ON(sizeof(unsigned long) !=
- sizeof(*au_si_pid->pid_bitmap));
-
- mutex_lock(&au_si_pid->pid_mtx);
- p = au_si_pid->pid_bitmap[idx];
- while (!p) {
- /*
- * bad approach.
- * but keeping 'si_pid_set()' void is more important.
- */
- p = kcalloc(BITS_TO_LONGS(AU_PIDSTEP),
- sizeof(*au_si_pid->pid_bitmap),
- GFP_NOFS);
- if (p)
- break;
- cond_resched();
- }
- au_si_pid->pid_bitmap[idx] = p;
- mutex_unlock(&au_si_pid->pid_mtx);
-}
-
-void si_pid_set(struct super_block *sb)
-{
- pid_t bit;
- int idx;
- unsigned long *bitmap;
- struct au_si_pid *au_si_pid;
-
- si_pid_idx_bit(&idx, &bit);
- au_si_pid = &au_sbi(sb)->au_si_pid;
- bitmap = au_si_pid->pid_bitmap[idx];
- if (!bitmap) {
- si_pid_alloc(au_si_pid, idx);
- bitmap = au_si_pid->pid_bitmap[idx];
- }
- AuDebugOn(test_bit(bit, bitmap));
- set_bit(bit, bitmap);
- /* smp_mb(); */
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * simple list protected by a spinlock
- */
-
-#ifndef __AUFS_SPL_H__
-#define __AUFS_SPL_H__
-
-#ifdef __KERNEL__
-
-#if 0
-struct au_splhead {
- spinlock_t spin;
- struct list_head head;
-};
-
-static inline void au_spl_init(struct au_splhead *spl)
-{
- spin_lock_init(&spl->spin);
- INIT_LIST_HEAD(&spl->head);
-}
-
-static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_add(list, &spl->head);
- spin_unlock(&spl->spin);
-}
-
-static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_del(list);
- spin_unlock(&spl->spin);
-}
-
-static inline void au_spl_del_rcu(struct list_head *list,
- struct au_splhead *spl)
-{
- spin_lock(&spl->spin);
- list_del_rcu(list);
- spin_unlock(&spl->spin);
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-struct au_sphlhead {
- spinlock_t spin;
- struct hlist_head head;
-};
-
-static inline void au_sphl_init(struct au_sphlhead *sphl)
-{
- spin_lock_init(&sphl->spin);
- INIT_HLIST_HEAD(&sphl->head);
-}
-
-static inline void au_sphl_add(struct hlist_node *hlist,
- struct au_sphlhead *sphl)
-{
- spin_lock(&sphl->spin);
- hlist_add_head(hlist, &sphl->head);
- spin_unlock(&sphl->spin);
-}
-
-static inline void au_sphl_del(struct hlist_node *hlist,
- struct au_sphlhead *sphl)
-{
- spin_lock(&sphl->spin);
- hlist_del(hlist);
- spin_unlock(&sphl->spin);
-}
-
-static inline void au_sphl_del_rcu(struct hlist_node *hlist,
- struct au_sphlhead *sphl)
-{
- spin_lock(&sphl->spin);
- hlist_del_rcu(hlist);
- spin_unlock(&sphl->spin);
-}
-
-static inline unsigned long au_sphl_count(struct au_sphlhead *sphl)
-{
- unsigned long cnt;
- struct hlist_node *pos;
-
- cnt = 0;
- spin_lock(&sphl->spin);
- hlist_for_each(pos, &sphl->head)
- cnt++;
- spin_unlock(&sphl->spin);
- return cnt;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_SPL_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * mount and super_block operations
- */
-
-#include <linux/mm.h>
-#include <linux/seq_file.h>
-#include <linux/statfs.h>
-#include <linux/vmalloc.h>
-#include "aufs.h"
-
-/*
- * super_operations
- */
-static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
-{
- struct au_icntnr *c;
-
- c = au_cache_alloc_icntnr();
- if (c) {
- au_icntnr_init(c);
- c->vfs_inode.i_version = 1; /* sigen(sb); */
- c->iinfo.ii_hinode = NULL;
- return &c->vfs_inode;
- }
- return NULL;
-}
-
-static void aufs_destroy_inode_cb(struct rcu_head *head)
-{
- struct inode *inode = container_of(head, struct inode, i_rcu);
-
- au_cache_dfree_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
-}
-
-static void aufs_destroy_inode(struct inode *inode)
-{
- if (!au_is_bad_inode(inode))
- au_iinfo_fin(inode);
- call_rcu(&inode->i_rcu, aufs_destroy_inode_cb);
-}
-
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
-{
- struct inode *inode;
- int err;
-
- inode = iget_locked(sb, ino);
- if (unlikely(!inode)) {
- inode = ERR_PTR(-ENOMEM);
- goto out;
- }
- if (!(inode->i_state & I_NEW))
- goto out;
-
- err = au_xigen_new(inode);
- if (!err)
- err = au_iinfo_init(inode);
- if (!err)
- inode->i_version++;
- else {
- iget_failed(inode);
- inode = ERR_PTR(err);
- }
-
-out:
- /* never return NULL */
- AuDebugOn(!inode);
- AuTraceErrPtr(inode);
- return inode;
-}
-
-/* lock free root dinfo */
-static int au_show_brs(struct seq_file *seq, struct super_block *sb)
-{
- int err;
- aufs_bindex_t bindex, bbot;
- struct path path;
- struct au_hdentry *hdp;
- struct au_branch *br;
- au_br_perm_str_t perm;
-
- err = 0;
- bbot = au_sbbot(sb);
- bindex = 0;
- hdp = au_hdentry(au_di(sb->s_root), bindex);
- for (; !err && bindex <= bbot; bindex++, hdp++) {
- br = au_sbr(sb, bindex);
- path.mnt = au_br_mnt(br);
- path.dentry = hdp->hd_dentry;
- err = au_seq_path(seq, &path);
- if (!err) {
- au_optstr_br_perm(&perm, br->br_perm);
- seq_printf(seq, "=%s", perm.a);
- if (bindex != bbot)
- seq_putc(seq, ':');
- }
- }
- if (unlikely(err || seq_has_overflowed(seq)))
- err = -E2BIG;
-
- return err;
-}
-
-static void au_show_wbr_create(struct seq_file *m, int v,
- struct au_sbinfo *sbinfo)
-{
- const char *pat;
-
- AuRwMustAnyLock(&sbinfo->si_rwsem);
-
- seq_puts(m, ",create=");
- pat = au_optstr_wbr_create(v);
- switch (v) {
- case AuWbrCreate_TDP:
- case AuWbrCreate_RR:
- case AuWbrCreate_MFS:
- case AuWbrCreate_PMFS:
- seq_puts(m, pat);
- break;
- case AuWbrCreate_MFSV:
- seq_printf(m, /*pat*/"mfs:%lu",
- jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
- / MSEC_PER_SEC);
- break;
- case AuWbrCreate_PMFSV:
- seq_printf(m, /*pat*/"pmfs:%lu",
- jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
- / MSEC_PER_SEC);
- break;
- case AuWbrCreate_MFSRR:
- seq_printf(m, /*pat*/"mfsrr:%llu",
- sbinfo->si_wbr_mfs.mfsrr_watermark);
- break;
- case AuWbrCreate_MFSRRV:
- seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
- sbinfo->si_wbr_mfs.mfsrr_watermark,
- jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
- / MSEC_PER_SEC);
- break;
- case AuWbrCreate_PMFSRR:
- seq_printf(m, /*pat*/"pmfsrr:%llu",
- sbinfo->si_wbr_mfs.mfsrr_watermark);
- break;
- case AuWbrCreate_PMFSRRV:
- seq_printf(m, /*pat*/"pmfsrr:%llu:%lu",
- sbinfo->si_wbr_mfs.mfsrr_watermark,
- jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
- / MSEC_PER_SEC);
- break;
- }
-}
-
-static int au_show_xino(struct seq_file *seq, struct super_block *sb)
-{
-#ifdef CONFIG_SYSFS
- return 0;
-#else
- int err;
- const int len = sizeof(AUFS_XINO_FNAME) - 1;
- aufs_bindex_t bindex, brid;
- struct qstr *name;
- struct file *f;
- struct dentry *d, *h_root;
-
- AuRwMustAnyLock(&sbinfo->si_rwsem);
-
- err = 0;
- f = au_sbi(sb)->si_xib;
- if (!f)
- goto out;
-
- /* stop printing the default xino path on the first writable branch */
- h_root = NULL;
- brid = au_xino_brid(sb);
- if (brid >= 0) {
- bindex = au_br_index(sb, brid);
- h_root = au_hdentry(au_di(sb->s_root), bindex)->hd_dentry;
- }
- d = f->f_path.dentry;
- name = &d->d_name;
- /* safe ->d_parent because the file is unlinked */
- if (d->d_parent == h_root
- && name->len == len
- && !memcmp(name->name, AUFS_XINO_FNAME, len))
- goto out;
-
- seq_puts(seq, ",xino=");
- err = au_xino_path(seq, f);
-
-out:
- return err;
-#endif
-}
-
-/* seq_file will re-call me in case of too long string */
-static int aufs_show_options(struct seq_file *m, struct dentry *dentry)
-{
- int err;
- unsigned int mnt_flags, v;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
-#define AuBool(name, str) do { \
- v = au_opt_test(mnt_flags, name); \
- if (v != au_opt_test(AuOpt_Def, name)) \
- seq_printf(m, ",%s" #str, v ? "" : "no"); \
-} while (0)
-
-#define AuStr(name, str) do { \
- v = mnt_flags & AuOptMask_##name; \
- if (v != (AuOpt_Def & AuOptMask_##name)) \
- seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
-} while (0)
-
-#define AuUInt(name, str, val) do { \
- if (val != AUFS_##name##_DEF) \
- seq_printf(m, "," #str "=%u", val); \
-} while (0)
-
- sb = dentry->d_sb;
- if (sb->s_flags & MS_POSIXACL)
- seq_puts(m, ",acl");
-
- /* lock free root dinfo */
- si_noflush_read_lock(sb);
- sbinfo = au_sbi(sb);
- seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
-
- mnt_flags = au_mntflags(sb);
- if (au_opt_test(mnt_flags, XINO)) {
- err = au_show_xino(m, sb);
- if (unlikely(err))
- goto out;
- } else
- seq_puts(m, ",noxino");
-
- AuBool(TRUNC_XINO, trunc_xino);
- AuStr(UDBA, udba);
- AuBool(SHWH, shwh);
- AuBool(PLINK, plink);
- AuBool(DIO, dio);
- AuBool(DIRPERM1, dirperm1);
-
- v = sbinfo->si_wbr_create;
- if (v != AuWbrCreate_Def)
- au_show_wbr_create(m, v, sbinfo);
-
- v = sbinfo->si_wbr_copyup;
- if (v != AuWbrCopyup_Def)
- seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
-
- v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
- if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
- seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
-
- AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
-
- v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC;
- AuUInt(RDCACHE, rdcache, v);
-
- AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
- AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
-
- au_fhsm_show(m, sbinfo);
-
- AuBool(SUM, sum);
- /* AuBool(SUM_W, wsum); */
- AuBool(WARN_PERM, warn_perm);
- AuBool(VERBOSE, verbose);
-
-out:
- /* be sure to print "br:" last */
- if (!sysaufs_brs) {
- seq_puts(m, ",br:");
- au_show_brs(m, sb);
- }
- si_read_unlock(sb);
- return 0;
-
-#undef AuBool
-#undef AuStr
-#undef AuUInt
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* sum mode which returns the summation for statfs(2) */
-
-static u64 au_add_till_max(u64 a, u64 b)
-{
- u64 old;
-
- old = a;
- a += b;
- if (old <= a)
- return a;
- return ULLONG_MAX;
-}
-
-static u64 au_mul_till_max(u64 a, long mul)
-{
- u64 old;
-
- old = a;
- a *= mul;
- if (old <= a)
- return a;
- return ULLONG_MAX;
-}
-
-static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
-{
- int err;
- long bsize, factor;
- u64 blocks, bfree, bavail, files, ffree;
- aufs_bindex_t bbot, bindex, i;
- unsigned char shared;
- struct path h_path;
- struct super_block *h_sb;
-
- err = 0;
- bsize = LONG_MAX;
- files = 0;
- ffree = 0;
- blocks = 0;
- bfree = 0;
- bavail = 0;
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- h_path.mnt = au_sbr_mnt(sb, bindex);
- h_sb = h_path.mnt->mnt_sb;
- shared = 0;
- for (i = 0; !shared && i < bindex; i++)
- shared = (au_sbr_sb(sb, i) == h_sb);
- if (shared)
- continue;
-
- /* sb->s_root for NFS is unreliable */
- h_path.dentry = h_path.mnt->mnt_root;
- err = vfs_statfs(&h_path, buf);
- if (unlikely(err))
- goto out;
-
- if (bsize > buf->f_bsize) {
- /*
- * we will reduce bsize, so we have to expand blocks
- * etc. to match them again
- */
- factor = (bsize / buf->f_bsize);
- blocks = au_mul_till_max(blocks, factor);
- bfree = au_mul_till_max(bfree, factor);
- bavail = au_mul_till_max(bavail, factor);
- bsize = buf->f_bsize;
- }
-
- factor = (buf->f_bsize / bsize);
- blocks = au_add_till_max(blocks,
- au_mul_till_max(buf->f_blocks, factor));
- bfree = au_add_till_max(bfree,
- au_mul_till_max(buf->f_bfree, factor));
- bavail = au_add_till_max(bavail,
- au_mul_till_max(buf->f_bavail, factor));
- files = au_add_till_max(files, buf->f_files);
- ffree = au_add_till_max(ffree, buf->f_ffree);
- }
-
- buf->f_bsize = bsize;
- buf->f_blocks = blocks;
- buf->f_bfree = bfree;
- buf->f_bavail = bavail;
- buf->f_files = files;
- buf->f_ffree = ffree;
- buf->f_frsize = 0;
-
-out:
- return err;
-}
-
-static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
- int err;
- struct path h_path;
- struct super_block *sb;
-
- /* lock free root dinfo */
- sb = dentry->d_sb;
- si_noflush_read_lock(sb);
- if (!au_opt_test(au_mntflags(sb), SUM)) {
- /* sb->s_root for NFS is unreliable */
- h_path.mnt = au_sbr_mnt(sb, 0);
- h_path.dentry = h_path.mnt->mnt_root;
- err = vfs_statfs(&h_path, buf);
- } else
- err = au_statfs_sum(sb, buf);
- si_read_unlock(sb);
-
- if (!err) {
- buf->f_type = AUFS_SUPER_MAGIC;
- buf->f_namelen = AUFS_MAX_NAMELEN;
- memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
- }
- /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int aufs_sync_fs(struct super_block *sb, int wait)
-{
- int err, e;
- aufs_bindex_t bbot, bindex;
- struct au_branch *br;
- struct super_block *h_sb;
-
- err = 0;
- si_noflush_read_lock(sb);
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (!au_br_writable(br->br_perm))
- continue;
-
- h_sb = au_sbr_sb(sb, bindex);
- if (h_sb->s_op->sync_fs) {
- e = h_sb->s_op->sync_fs(h_sb, wait);
- if (unlikely(e && !err))
- err = e;
- /* go on even if an error happens */
- }
- }
- si_read_unlock(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* final actions when unmounting a file system */
-static void aufs_put_super(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = au_sbi(sb);
- if (!sbinfo)
- return;
-
- dbgaufs_si_fin(sbinfo);
- kobject_put(&sbinfo->si_kobj);
-}
-
-/* ---------------------------------------------------------------------- */
-
-void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb,
- struct super_block *sb, void *arg)
-{
- void *array;
- unsigned long long n, sz;
-
- array = NULL;
- n = 0;
- if (!*hint)
- goto out;
-
- if (*hint > ULLONG_MAX / sizeof(array)) {
- array = ERR_PTR(-EMFILE);
- pr_err("hint %llu\n", *hint);
- goto out;
- }
-
- sz = sizeof(array) * *hint;
- array = kzalloc(sz, GFP_NOFS);
- if (unlikely(!array))
- array = vzalloc(sz);
- if (unlikely(!array)) {
- array = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- n = cb(sb, array, *hint, arg);
- AuDebugOn(n > *hint);
-
-out:
- *hint = n;
- return array;
-}
-
-static unsigned long long au_iarray_cb(struct super_block *sb, void *a,
- unsigned long long max __maybe_unused,
- void *arg)
-{
- unsigned long long n;
- struct inode **p, *inode;
- struct list_head *head;
-
- n = 0;
- p = a;
- head = arg;
- spin_lock(&sb->s_inode_list_lock);
- list_for_each_entry(inode, head, i_sb_list) {
- if (!au_is_bad_inode(inode)
- && au_ii(inode)->ii_btop >= 0) {
- spin_lock(&inode->i_lock);
- if (atomic_read(&inode->i_count)) {
- au_igrab(inode);
- *p++ = inode;
- n++;
- AuDebugOn(n > max);
- }
- spin_unlock(&inode->i_lock);
- }
- }
- spin_unlock(&sb->s_inode_list_lock);
-
- return n;
-}
-
-struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max)
-{
- *max = au_ninodes(sb);
- return au_array_alloc(max, au_iarray_cb, sb, &sb->s_inodes);
-}
-
-void au_iarray_free(struct inode **a, unsigned long long max)
-{
- unsigned long long ull;
-
- for (ull = 0; ull < max; ull++)
- iput(a[ull]);
- kvfree(a);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * refresh dentry and inode at remount time.
- */
-/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */
-static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags,
- struct dentry *parent)
-{
- int err;
-
- di_write_lock_child(dentry);
- di_read_lock_parent(parent, AuLock_IR);
- err = au_refresh_dentry(dentry, parent);
- if (!err && dir_flags)
- au_hn_reset(d_inode(dentry), dir_flags);
- di_read_unlock(parent, AuLock_IR);
- di_write_unlock(dentry);
-
- return err;
-}
-
-static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen,
- struct au_sbinfo *sbinfo,
- const unsigned int dir_flags, unsigned int do_idop)
-{
- int err;
- struct dentry *parent;
-
- err = 0;
- parent = dget_parent(dentry);
- if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) {
- if (d_really_is_positive(dentry)) {
- if (!d_is_dir(dentry))
- err = au_do_refresh(dentry, /*dir_flags*/0,
- parent);
- else {
- err = au_do_refresh(dentry, dir_flags, parent);
- if (unlikely(err))
- au_fset_si(sbinfo, FAILED_REFRESH_DIR);
- }
- } else
- err = au_do_refresh(dentry, /*dir_flags*/0, parent);
- AuDbgDentry(dentry);
- }
- dput(parent);
-
- if (!err) {
- if (do_idop)
- au_refresh_dop(dentry, /*force_reval*/0);
- } else
- au_refresh_dop(dentry, /*force_reval*/1);
-
- AuTraceErr(err);
- return err;
-}
-
-static int au_refresh_d(struct super_block *sb, unsigned int do_idop)
-{
- int err, i, j, ndentry, e;
- unsigned int sigen;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries, *d;
- struct au_sbinfo *sbinfo;
- struct dentry *root = sb->s_root;
- const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1);
-
- if (do_idop)
- au_refresh_dop(root, /*force_reval*/0);
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_dcsub_pages(&dpages, root, NULL, NULL);
- if (unlikely(err))
- goto out_dpages;
-
- sigen = au_sigen(sb);
- sbinfo = au_sbi(sb);
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- d = dentries[j];
- e = au_do_refresh_d(d, sigen, sbinfo, dir_flags,
- do_idop);
- if (unlikely(e && !err))
- err = e;
- /* go on even err */
- }
- }
-
-out_dpages:
- au_dpages_free(&dpages);
-out:
- return err;
-}
-
-static int au_refresh_i(struct super_block *sb, unsigned int do_idop)
-{
- int err, e;
- unsigned int sigen;
- unsigned long long max, ull;
- struct inode *inode, **array;
-
- array = au_iarray_alloc(sb, &max);
- err = PTR_ERR(array);
- if (IS_ERR(array))
- goto out;
-
- err = 0;
- sigen = au_sigen(sb);
- for (ull = 0; ull < max; ull++) {
- inode = array[ull];
- if (unlikely(!inode))
- break;
-
- e = 0;
- ii_write_lock_child(inode);
- if (au_iigen(inode, NULL) != sigen) {
- e = au_refresh_hinode_self(inode);
- if (unlikely(e)) {
- au_refresh_iop(inode, /*force_getattr*/1);
- pr_err("error %d, i%lu\n", e, inode->i_ino);
- if (!err)
- err = e;
- /* go on even if err */
- }
- }
- if (!e && do_idop)
- au_refresh_iop(inode, /*force_getattr*/0);
- ii_write_unlock(inode);
- }
-
- au_iarray_free(array, max);
-
-out:
- return err;
-}
-
-static void au_remount_refresh(struct super_block *sb, unsigned int do_idop)
-{
- int err, e;
- unsigned int udba;
- aufs_bindex_t bindex, bbot;
- struct dentry *root;
- struct inode *inode;
- struct au_branch *br;
- struct au_sbinfo *sbi;
-
- au_sigen_inc(sb);
- sbi = au_sbi(sb);
- au_fclr_si(sbi, FAILED_REFRESH_DIR);
-
- root = sb->s_root;
- DiMustNoWaiters(root);
- inode = d_inode(root);
- IiMustNoWaiters(inode);
-
- udba = au_opt_udba(sb);
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- err = au_hnotify_reset_br(udba, br, br->br_perm);
- if (unlikely(err))
- AuIOErr("hnotify failed on br %d, %d, ignored\n",
- bindex, err);
- /* go on even if err */
- }
- au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1));
-
- if (do_idop) {
- if (au_ftest_si(sbi, NO_DREVAL)) {
- AuDebugOn(sb->s_d_op == &aufs_dop_noreval);
- sb->s_d_op = &aufs_dop_noreval;
- AuDebugOn(sbi->si_iop_array == aufs_iop_nogetattr);
- sbi->si_iop_array = aufs_iop_nogetattr;
- } else {
- AuDebugOn(sb->s_d_op == &aufs_dop);
- sb->s_d_op = &aufs_dop;
- AuDebugOn(sbi->si_iop_array == aufs_iop);
- sbi->si_iop_array = aufs_iop;
- }
- pr_info("reset to %pf and %pf\n",
- sb->s_d_op, sbi->si_iop_array);
- }
-
- di_write_unlock(root);
- err = au_refresh_d(sb, do_idop);
- e = au_refresh_i(sb, do_idop);
- if (unlikely(e && !err))
- err = e;
- /* aufs_write_lock() calls ..._child() */
- di_write_lock_child(root);
-
- au_cpup_attr_all(inode, /*force*/1);
-
- if (unlikely(err))
- AuIOErr("refresh failed, ignored, %d\n", err);
-}
-
-/* stop extra interpretation of errno in mount(8), and strange error messages */
-static int cvt_err(int err)
-{
- AuTraceErr(err);
-
- switch (err) {
- case -ENOENT:
- case -ENOTDIR:
- case -EEXIST:
- case -EIO:
- err = -EINVAL;
- }
- return err;
-}
-
-static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
- int err, do_dx;
- unsigned int mntflags;
- struct au_opts opts = {
- .opt = NULL
- };
- struct dentry *root;
- struct inode *inode;
- struct au_sbinfo *sbinfo;
-
- err = 0;
- root = sb->s_root;
- if (!data || !*data) {
- err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (!err) {
- di_write_lock_child(root);
- err = au_opts_verify(sb, *flags, /*pending*/0);
- aufs_write_unlock(root);
- }
- goto out;
- }
-
- err = -ENOMEM;
- opts.opt = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!opts.opt))
- goto out;
- opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
- opts.flags = AuOpts_REMOUNT;
- opts.sb_flags = *flags;
-
- /* parse it before aufs lock */
- err = au_opts_parse(sb, data, &opts);
- if (unlikely(err))
- goto out_opts;
-
- sbinfo = au_sbi(sb);
- inode = d_inode(root);
- inode_lock(inode);
- err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out_mtx;
- di_write_lock_child(root);
-
- /* au_opts_remount() may return an error */
- err = au_opts_remount(sb, &opts);
- au_opts_free(&opts);
-
- if (au_ftest_opts(opts.flags, REFRESH))
- au_remount_refresh(sb, au_ftest_opts(opts.flags, REFRESH_IDOP));
-
- if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) {
- mntflags = au_mntflags(sb);
- do_dx = !!au_opt_test(mntflags, DIO);
- au_dy_arefresh(do_dx);
- }
-
- au_fhsm_wrote_all(sb, /*force*/1); /* ?? */
- aufs_write_unlock(root);
-
-out_mtx:
- inode_unlock(inode);
-out_opts:
- au_delayed_free_page((unsigned long)opts.opt);
-out:
- err = cvt_err(err);
- AuTraceErr(err);
- return err;
-}
-
-static const struct super_operations aufs_sop = {
- .alloc_inode = aufs_alloc_inode,
- .destroy_inode = aufs_destroy_inode,
- /* always deleting, no clearing */
- .drop_inode = generic_delete_inode,
- .show_options = aufs_show_options,
- .statfs = aufs_statfs,
- .put_super = aufs_put_super,
- .sync_fs = aufs_sync_fs,
- .remount_fs = aufs_remount_fs
-};
-
-/* ---------------------------------------------------------------------- */
-
-static int alloc_root(struct super_block *sb)
-{
- int err;
- struct inode *inode;
- struct dentry *root;
-
- err = -ENOMEM;
- inode = au_iget_locked(sb, AUFS_ROOT_INO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- inode->i_op = aufs_iop + AuIop_DIR; /* with getattr by default */
- inode->i_fop = &aufs_dir_fop;
- inode->i_mode = S_IFDIR;
- set_nlink(inode, 2);
- unlock_new_inode(inode);
-
- root = d_make_root(inode);
- if (unlikely(!root))
- goto out;
- err = PTR_ERR(root);
- if (IS_ERR(root))
- goto out;
-
- err = au_di_init(root);
- if (!err) {
- sb->s_root = root;
- return 0; /* success */
- }
- dput(root);
-
-out:
- return err;
-}
-
-static int aufs_fill_super(struct super_block *sb, void *raw_data,
- int silent __maybe_unused)
-{
- int err;
- struct au_opts opts = {
- .opt = NULL
- };
- struct au_sbinfo *sbinfo;
- struct dentry *root;
- struct inode *inode;
- char *arg = raw_data;
-
- if (unlikely(!arg || !*arg)) {
- err = -EINVAL;
- pr_err("no arg\n");
- goto out;
- }
-
- err = -ENOMEM;
- opts.opt = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!opts.opt))
- goto out;
- opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
- opts.sb_flags = sb->s_flags;
-
- err = au_si_alloc(sb);
- if (unlikely(err))
- goto out_opts;
- sbinfo = au_sbi(sb);
-
- /* all timestamps always follow the ones on the branch */
- sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
- sb->s_op = &aufs_sop;
- sb->s_d_op = &aufs_dop;
- sb->s_magic = AUFS_SUPER_MAGIC;
- sb->s_maxbytes = 0;
- sb->s_stack_depth = 1;
- au_export_init(sb);
- /* au_xattr_init(sb); */
-
- err = alloc_root(sb);
- if (unlikely(err)) {
- si_write_unlock(sb);
- goto out_info;
- }
- root = sb->s_root;
- inode = d_inode(root);
-
- /*
- * actually we can parse options regardless aufs lock here.
- * but at remount time, parsing must be done before aufs lock.
- * so we follow the same rule.
- */
- ii_write_lock_parent(inode);
- aufs_write_unlock(root);
- err = au_opts_parse(sb, arg, &opts);
- if (unlikely(err))
- goto out_root;
-
- /* lock vfs_inode first, then aufs. */
- inode_lock(inode);
- aufs_write_lock(root);
- err = au_opts_mount(sb, &opts);
- au_opts_free(&opts);
- if (!err && au_ftest_si(sbinfo, NO_DREVAL)) {
- sb->s_d_op = &aufs_dop_noreval;
- pr_info("%pf\n", sb->s_d_op);
- au_refresh_dop(root, /*force_reval*/0);
- sbinfo->si_iop_array = aufs_iop_nogetattr;
- au_refresh_iop(inode, /*force_getattr*/0);
- }
- aufs_write_unlock(root);
- inode_unlock(inode);
- if (!err)
- goto out_opts; /* success */
-
-out_root:
- dput(root);
- sb->s_root = NULL;
-out_info:
- dbgaufs_si_fin(sbinfo);
- kobject_put(&sbinfo->si_kobj);
- sb->s_fs_info = NULL;
-out_opts:
- au_delayed_free_page((unsigned long)opts.opt);
-out:
- AuTraceErr(err);
- err = cvt_err(err);
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name __maybe_unused,
- void *raw_data)
-{
- struct dentry *root;
- struct super_block *sb;
-
- /* all timestamps always follow the ones on the branch */
- /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
- root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super);
- if (IS_ERR(root))
- goto out;
-
- sb = root->d_sb;
- si_write_lock(sb, !AuLock_FLUSH);
- sysaufs_brs_add(sb, 0);
- si_write_unlock(sb);
- au_sbilist_add(sb);
-
-out:
- return root;
-}
-
-static void aufs_kill_sb(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- sbinfo = au_sbi(sb);
- if (sbinfo) {
- au_sbilist_del(sb);
- aufs_write_lock(sb->s_root);
- au_fhsm_fin(sb);
- if (sbinfo->si_wbr_create_ops->fin)
- sbinfo->si_wbr_create_ops->fin(sb);
- if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) {
- au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE);
- au_remount_refresh(sb, /*do_idop*/0);
- }
- if (au_opt_test(sbinfo->si_mntflags, PLINK))
- au_plink_put(sb, /*verbose*/1);
- au_xino_clr(sb);
- sbinfo->si_sb = NULL;
- aufs_write_unlock(sb->s_root);
- au_nwt_flush(&sbinfo->si_nowait);
- }
- kill_anon_super(sb);
-}
-
-struct file_system_type aufs_fs_type = {
- .name = AUFS_FSTYPE,
- /* a race between rename and others */
- .fs_flags = FS_RENAME_DOES_D_MOVE,
- .mount = aufs_mount,
- .kill_sb = aufs_kill_sb,
- /* no need to __module_get() and module_put(). */
- .owner = THIS_MODULE,
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * super_block operations
- */
-
-#ifndef __AUFS_SUPER_H__
-#define __AUFS_SUPER_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/kobject.h>
-#include "rwsem.h"
-#include "spl.h"
-#include "wkq.h"
-
-/* policies to select one among multiple writable branches */
-struct au_wbr_copyup_operations {
- int (*copyup)(struct dentry *dentry);
-};
-
-#define AuWbr_DIR 1 /* target is a dir */
-#define AuWbr_PARENT (1 << 1) /* always require a parent */
-
-#define au_ftest_wbr(flags, name) ((flags) & AuWbr_##name)
-#define au_fset_wbr(flags, name) { (flags) |= AuWbr_##name; }
-#define au_fclr_wbr(flags, name) { (flags) &= ~AuWbr_##name; }
-
-struct au_wbr_create_operations {
- int (*create)(struct dentry *dentry, unsigned int flags);
- int (*init)(struct super_block *sb);
- int (*fin)(struct super_block *sb);
-};
-
-struct au_wbr_mfs {
- struct mutex mfs_lock; /* protect this structure */
- unsigned long mfs_jiffy;
- unsigned long mfs_expire;
- aufs_bindex_t mfs_bindex;
-
- unsigned long long mfsrr_bytes;
- unsigned long long mfsrr_watermark;
-};
-
-#define AuPlink_NHASH 100
-static inline int au_plink_hash(ino_t ino)
-{
- return ino % AuPlink_NHASH;
-}
-
-/* File-based Hierarchical Storage Management */
-struct au_fhsm {
-#ifdef CONFIG_AUFS_FHSM
- /* allow only one process who can receive the notification */
- spinlock_t fhsm_spin;
- pid_t fhsm_pid;
- wait_queue_head_t fhsm_wqh;
- atomic_t fhsm_readable;
-
- /* these are protected by si_rwsem */
- unsigned long fhsm_expire;
- aufs_bindex_t fhsm_bottom;
-#endif
-};
-
-#define AU_PIDSTEP (int)(BITS_TO_LONGS(PID_MAX_DEFAULT) * BITS_PER_LONG)
-#define AU_NPIDMAP (int)DIV_ROUND_UP(PID_MAX_LIMIT, AU_PIDSTEP)
-struct au_si_pid {
- unsigned long *pid_bitmap[AU_NPIDMAP];
- struct mutex pid_mtx;
-};
-
-struct au_branch;
-struct au_sbinfo {
- /* nowait tasks in the system-wide workqueue */
- struct au_nowait_tasks si_nowait;
-
- /*
- * tried sb->s_umount, but failed due to the dependecy between i_mutex.
- * rwsem for au_sbinfo is necessary.
- */
- struct au_rwsem si_rwsem;
-
- /* prevent recursive locking in deleting inode */
- struct au_si_pid au_si_pid;
-
- /*
- * dirty approach to protect sb->sb_inodes and ->s_files (gone) from
- * remount.
- */
- struct percpu_counter si_ninodes, si_nfiles;
-
- /* branch management */
- unsigned int si_generation;
-
- /* see AuSi_ flags */
- unsigned char au_si_status;
-
- aufs_bindex_t si_bbot;
-
- /* dirty trick to keep br_id plus */
- unsigned int si_last_br_id :
- sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1;
- struct au_branch **si_branch;
-
- /* policy to select a writable branch */
- unsigned char si_wbr_copyup;
- unsigned char si_wbr_create;
- struct au_wbr_copyup_operations *si_wbr_copyup_ops;
- struct au_wbr_create_operations *si_wbr_create_ops;
-
- /* round robin */
- atomic_t si_wbr_rr_next;
-
- /* most free space */
- struct au_wbr_mfs si_wbr_mfs;
-
- /* File-based Hierarchical Storage Management */
- struct au_fhsm si_fhsm;
-
- /* mount flags */
- /* include/asm-ia64/siginfo.h defines a macro named si_flags */
- unsigned int si_mntflags;
-
- /* external inode number (bitmap and translation table) */
- vfs_readf_t si_xread;
- vfs_writef_t si_xwrite;
- struct file *si_xib;
- struct mutex si_xib_mtx; /* protect xib members */
- unsigned long *si_xib_buf;
- unsigned long si_xib_last_pindex;
- int si_xib_next_bit;
- aufs_bindex_t si_xino_brid;
- unsigned long si_xino_jiffy;
- unsigned long si_xino_expire;
- /* reserved for future use */
- /* unsigned long long si_xib_limit; */ /* Max xib file size */
-
-#ifdef CONFIG_AUFS_EXPORT
- /* i_generation */
- struct file *si_xigen;
- atomic_t si_xigen_next;
-#endif
-
- /* dirty trick to suppoer atomic_open */
- struct au_sphlhead si_aopen;
-
- /* vdir parameters */
- unsigned long si_rdcache; /* max cache time in jiffies */
- unsigned int si_rdblk; /* deblk size */
- unsigned int si_rdhash; /* hash size */
-
- /*
- * If the number of whiteouts are larger than si_dirwh, leave all of
- * them after au_whtmp_ren to reduce the cost of rmdir(2).
- * future fsck.aufs or kernel thread will remove them later.
- * Otherwise, remove all whiteouts and the dir in rmdir(2).
- */
- unsigned int si_dirwh;
-
- /* pseudo_link list */
- struct au_sphlhead si_plink[AuPlink_NHASH];
- wait_queue_head_t si_plink_wq;
- spinlock_t si_plink_maint_lock;
- pid_t si_plink_maint_pid;
-
- /* file list */
- struct au_sphlhead si_files;
-
- /* with/without getattr, brother of sb->s_d_op */
- struct inode_operations *si_iop_array;
-
- /*
- * sysfs and lifetime management.
- * this is not a small structure and it may be a waste of memory in case
- * of sysfs is disabled, particulary when many aufs-es are mounted.
- * but using sysfs is majority.
- */
- struct kobject si_kobj;
-#ifdef CONFIG_DEBUG_FS
- struct dentry *si_dbgaufs;
- struct dentry *si_dbgaufs_plink;
- struct dentry *si_dbgaufs_xib;
-#ifdef CONFIG_AUFS_EXPORT
- struct dentry *si_dbgaufs_xigen;
-#endif
-#endif
-
-#ifdef CONFIG_AUFS_SBILIST
- struct hlist_node si_list;
-#endif
-
- /* dirty, necessary for unmounting, sysfs and sysrq */
- struct super_block *si_sb;
-};
-
-/* sbinfo status flags */
-/*
- * set true when refresh_dirs() failed at remount time.
- * then try refreshing dirs at access time again.
- * if it is false, refreshing dirs at access time is unnecesary
- */
-#define AuSi_FAILED_REFRESH_DIR 1
-#define AuSi_FHSM (1 << 1) /* fhsm is active now */
-#define AuSi_NO_DREVAL (1 << 2) /* disable all d_revalidate */
-
-#ifndef CONFIG_AUFS_FHSM
-#undef AuSi_FHSM
-#define AuSi_FHSM 0
-#endif
-
-static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
- unsigned int flag)
-{
- AuRwMustAnyLock(&sbi->si_rwsem);
- return sbi->au_si_status & flag;
-}
-#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name)
-#define au_fset_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status |= AuSi_##name; \
-} while (0)
-#define au_fclr_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status &= ~AuSi_##name; \
-} while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* policy to select one among writable branches */
-#define AuWbrCopyup(sbinfo, ...) \
- ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
-#define AuWbrCreate(sbinfo, ...) \
- ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
-
-/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
-#define AuLock_DW 1 /* write-lock dentry */
-#define AuLock_IR (1 << 1) /* read-lock inode */
-#define AuLock_IW (1 << 2) /* write-lock inode */
-#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */
-#define AuLock_DIRS (1 << 4) /* target is a pair of dirs */
-#define AuLock_NOPLM (1 << 5) /* return err in plm mode */
-#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */
-#define AuLock_GEN (1 << 7) /* test digen/iigen */
-#define au_ftest_lock(flags, name) ((flags) & AuLock_##name)
-#define au_fset_lock(flags, name) \
- do { (flags) |= AuLock_##name; } while (0)
-#define au_fclr_lock(flags, name) \
- do { (flags) &= ~AuLock_##name; } while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* super.c */
-extern struct file_system_type aufs_fs_type;
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
-typedef unsigned long long (*au_arraycb_t)(struct super_block *sb, void *array,
- unsigned long long max, void *arg);
-void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb,
- struct super_block *sb, void *arg);
-struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max);
-void au_iarray_free(struct inode **a, unsigned long long max);
-
-/* sbinfo.c */
-void au_si_free(struct kobject *kobj);
-int au_si_alloc(struct super_block *sb);
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink);
-
-unsigned int au_sigen_inc(struct super_block *sb);
-aufs_bindex_t au_new_br_id(struct super_block *sb);
-
-int si_read_lock(struct super_block *sb, int flags);
-int si_write_lock(struct super_block *sb, int flags);
-int aufs_read_lock(struct dentry *dentry, int flags);
-void aufs_read_unlock(struct dentry *dentry, int flags);
-void aufs_write_lock(struct dentry *dentry);
-void aufs_write_unlock(struct dentry *dentry);
-int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags);
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
-
-/* wbr_policy.c */
-extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
-extern struct au_wbr_create_operations au_wbr_create_ops[];
-int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex);
-int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop);
-
-/* mvdown.c */
-int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg);
-
-#ifdef CONFIG_AUFS_FHSM
-/* fhsm.c */
-
-static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm)
-{
- pid_t pid;
-
- spin_lock(&fhsm->fhsm_spin);
- pid = fhsm->fhsm_pid;
- spin_unlock(&fhsm->fhsm_spin);
-
- return pid;
-}
-
-void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force);
-void au_fhsm_wrote_all(struct super_block *sb, int force);
-int au_fhsm_fd(struct super_block *sb, int oflags);
-int au_fhsm_br_alloc(struct au_branch *br);
-void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex);
-void au_fhsm_fin(struct super_block *sb);
-void au_fhsm_init(struct au_sbinfo *sbinfo);
-void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec);
-void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo);
-#else
-AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex,
- int force)
-AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force)
-AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags)
-AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm)
-AuStubInt0(au_fhsm_br_alloc, struct au_branch *br)
-AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(au_fhsm_fin, struct super_block *sb)
-AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo)
-AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec)
-AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo)
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_sbinfo *au_sbi(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_EXPORT
-int au_test_nfsd(void);
-void au_export_init(struct super_block *sb);
-void au_xigen_inc(struct inode *inode);
-int au_xigen_new(struct inode *inode);
-int au_xigen_set(struct super_block *sb, struct file *base);
-void au_xigen_clr(struct super_block *sb);
-
-static inline int au_busy_or_stale(void)
-{
- if (!au_test_nfsd())
- return -EBUSY;
- return -ESTALE;
-}
-#else
-AuStubInt0(au_test_nfsd, void)
-AuStubVoid(au_export_init, struct super_block *sb)
-AuStubVoid(au_xigen_inc, struct inode *inode)
-AuStubInt0(au_xigen_new, struct inode *inode)
-AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
-AuStubVoid(au_xigen_clr, struct super_block *sb)
-AuStub(int, au_busy_or_stale, return -EBUSY, void)
-#endif /* CONFIG_AUFS_EXPORT */
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_SBILIST
-/* module.c */
-extern struct au_sphlhead au_sbilist;
-
-static inline void au_sbilist_init(void)
-{
- au_sphl_init(&au_sbilist);
-}
-
-static inline void au_sbilist_add(struct super_block *sb)
-{
- au_sphl_add(&au_sbi(sb)->si_list, &au_sbilist);
-}
-
-static inline void au_sbilist_del(struct super_block *sb)
-{
- au_sphl_del(&au_sbi(sb)->si_list, &au_sbilist);
-}
-
-#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-static inline void au_sbilist_lock(void)
-{
- spin_lock(&au_sbilist.spin);
-}
-
-static inline void au_sbilist_unlock(void)
-{
- spin_unlock(&au_sbilist.spin);
-}
-#define AuGFP_SBILIST GFP_ATOMIC
-#else
-AuStubVoid(au_sbilist_lock, void)
-AuStubVoid(au_sbilist_unlock, void)
-#define AuGFP_SBILIST GFP_NOFS
-#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-#else
-AuStubVoid(au_sbilist_init, void)
-AuStubVoid(au_sbilist_add, struct super_block *sb)
-AuStubVoid(au_sbilist_del, struct super_block *sb)
-AuStubVoid(au_sbilist_lock, void)
-AuStubVoid(au_sbilist_unlock, void)
-#define AuGFP_SBILIST GFP_NOFS
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
-{
- /*
- * This function is a dynamic '__init' function actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-#ifdef CONFIG_DEBUG_FS
- sbinfo->si_dbgaufs = NULL;
- sbinfo->si_dbgaufs_plink = NULL;
- sbinfo->si_dbgaufs_xib = NULL;
-#ifdef CONFIG_AUFS_EXPORT
- sbinfo->si_dbgaufs_xigen = NULL;
-#endif
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline void si_pid_idx_bit(int *idx, pid_t *bit)
-{
- /* the origin of pid is 1, but the bitmap's is 0 */
- *bit = current->pid - 1;
- *idx = *bit / AU_PIDSTEP;
- *bit %= AU_PIDSTEP;
-}
-
-static inline int si_pid_test(struct super_block *sb)
-{
- pid_t bit;
- int idx;
- unsigned long *bitmap;
-
- si_pid_idx_bit(&idx, &bit);
- bitmap = au_sbi(sb)->au_si_pid.pid_bitmap[idx];
- if (bitmap)
- return test_bit(bit, bitmap);
- return 0;
-}
-
-static inline void si_pid_clr(struct super_block *sb)
-{
- pid_t bit;
- int idx;
- unsigned long *bitmap;
-
- si_pid_idx_bit(&idx, &bit);
- bitmap = au_sbi(sb)->au_si_pid.pid_bitmap[idx];
- BUG_ON(!bitmap);
- AuDebugOn(!test_bit(bit, bitmap));
- clear_bit(bit, bitmap);
- /* smp_mb(); */
-}
-
-void si_pid_set(struct super_block *sb);
-
-/* ---------------------------------------------------------------------- */
-
-/* lock superblock. mainly for entry point functions */
-/*
- * __si_read_lock, __si_write_lock,
- * __si_read_unlock, __si_write_unlock, __si_downgrade_lock
- */
-AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
-
-#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
-#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
-#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
-
-static inline void si_noflush_read_lock(struct super_block *sb)
-{
- __si_read_lock(sb);
- si_pid_set(sb);
-}
-
-static inline int si_noflush_read_trylock(struct super_block *sb)
-{
- int locked;
-
- locked = __si_read_trylock(sb);
- if (locked)
- si_pid_set(sb);
- return locked;
-}
-
-static inline void si_noflush_write_lock(struct super_block *sb)
-{
- __si_write_lock(sb);
- si_pid_set(sb);
-}
-
-static inline int si_noflush_write_trylock(struct super_block *sb)
-{
- int locked;
-
- locked = __si_write_trylock(sb);
- if (locked)
- si_pid_set(sb);
- return locked;
-}
-
-#if 0 /* reserved */
-static inline int si_read_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_read_trylock(sb);
-}
-#endif
-
-static inline void si_read_unlock(struct super_block *sb)
-{
- si_pid_clr(sb);
- __si_read_unlock(sb);
-}
-
-#if 0 /* reserved */
-static inline int si_write_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_write_trylock(sb);
-}
-#endif
-
-static inline void si_write_unlock(struct super_block *sb)
-{
- si_pid_clr(sb);
- __si_write_unlock(sb);
-}
-
-#if 0 /* reserved */
-static inline void si_downgrade_lock(struct super_block *sb)
-{
- __si_downgrade_lock(sb);
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline aufs_bindex_t au_sbbot(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_bbot;
-}
-
-static inline unsigned int au_mntflags(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_mntflags;
-}
-
-static inline unsigned int au_sigen(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_generation;
-}
-
-static inline unsigned long long au_ninodes(struct super_block *sb)
-{
- s64 n = percpu_counter_sum(&au_sbi(sb)->si_ninodes);
-
- BUG_ON(n < 0);
- return n;
-}
-
-static inline void au_ninodes_inc(struct super_block *sb)
-{
- percpu_counter_inc(&au_sbi(sb)->si_ninodes);
-}
-
-static inline void au_ninodes_dec(struct super_block *sb)
-{
- percpu_counter_dec(&au_sbi(sb)->si_ninodes);
-}
-
-static inline unsigned long long au_nfiles(struct super_block *sb)
-{
- s64 n = percpu_counter_sum(&au_sbi(sb)->si_nfiles);
-
- BUG_ON(n < 0);
- return n;
-}
-
-static inline void au_nfiles_inc(struct super_block *sb)
-{
- percpu_counter_inc(&au_sbi(sb)->si_nfiles);
-}
-
-static inline void au_nfiles_dec(struct super_block *sb)
-{
- percpu_counter_dec(&au_sbi(sb)->si_nfiles);
-}
-
-static inline struct au_branch *au_sbr(struct super_block *sb,
- aufs_bindex_t bindex)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_branch[0 + bindex];
-}
-
-static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
-{
- SiMustWriteLock(sb);
- au_sbi(sb)->si_xino_brid = brid;
-}
-
-static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_xino_brid;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_SUPER_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sysfs interface and lifetime management
- * they are necessary regardless sysfs is disabled.
- */
-
-#include <linux/random.h>
-#include "aufs.h"
-
-unsigned long sysaufs_si_mask;
-struct kset *sysaufs_kset;
-
-#define AuSiAttr(_name) { \
- .attr = { .name = __stringify(_name), .mode = 0444 }, \
- .show = sysaufs_si_##_name, \
-}
-
-static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
-struct attribute *sysaufs_si_attrs[] = {
- &sysaufs_si_attr_xi_path.attr,
- NULL,
-};
-
-static const struct sysfs_ops au_sbi_ops = {
- .show = sysaufs_si_show
-};
-
-static struct kobj_type au_sbi_ktype = {
- .release = au_si_free,
- .sysfs_ops = &au_sbi_ops,
- .default_attrs = sysaufs_si_attrs
-};
-
-/* ---------------------------------------------------------------------- */
-
-int sysaufs_si_init(struct au_sbinfo *sbinfo)
-{
- int err;
-
- sbinfo->si_kobj.kset = sysaufs_kset;
- /* cf. sysaufs_name() */
- err = kobject_init_and_add
- (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
- SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
-
- dbgaufs_si_null(sbinfo);
- if (!err) {
- err = dbgaufs_si_init(sbinfo);
- if (unlikely(err))
- kobject_put(&sbinfo->si_kobj);
- }
- return err;
-}
-
-void sysaufs_fin(void)
-{
- dbgaufs_fin();
- sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
- kset_unregister(sysaufs_kset);
-}
-
-int __init sysaufs_init(void)
-{
- int err;
-
- do {
- get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
- } while (!sysaufs_si_mask);
-
- err = -EINVAL;
- sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
- if (unlikely(!sysaufs_kset))
- goto out;
- err = PTR_ERR(sysaufs_kset);
- if (IS_ERR(sysaufs_kset))
- goto out;
- err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
- if (unlikely(err)) {
- kset_unregister(sysaufs_kset);
- goto out;
- }
-
- err = dbgaufs_init();
- if (unlikely(err))
- sysaufs_fin();
-out:
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sysfs interface and mount lifetime management
- */
-
-#ifndef __SYSAUFS_H__
-#define __SYSAUFS_H__
-
-#ifdef __KERNEL__
-
-#include <linux/sysfs.h>
-#include "module.h"
-
-struct super_block;
-struct au_sbinfo;
-
-struct sysaufs_si_attr {
- struct attribute attr;
- int (*show)(struct seq_file *seq, struct super_block *sb);
-};
-
-/* ---------------------------------------------------------------------- */
-
-/* sysaufs.c */
-extern unsigned long sysaufs_si_mask;
-extern struct kset *sysaufs_kset;
-extern struct attribute *sysaufs_si_attrs[];
-int sysaufs_si_init(struct au_sbinfo *sbinfo);
-int __init sysaufs_init(void);
-void sysaufs_fin(void);
-
-/* ---------------------------------------------------------------------- */
-
-/* some people doesn't like to show a pointer in kernel */
-static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
-{
- return sysaufs_si_mask ^ (unsigned long)sbinfo;
-}
-
-#define SysaufsSiNamePrefix "si_"
-#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
-static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
-{
- snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
- sysaufs_si_id(sbinfo));
-}
-
-struct au_branch;
-#ifdef CONFIG_SYSFS
-/* sysfs.c */
-extern struct attribute_group *sysaufs_attr_group;
-
-int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf);
-long au_brinfo_ioctl(struct file *file, unsigned long arg);
-#ifdef CONFIG_COMPAT
-long au_brinfo_compat_ioctl(struct file *file, unsigned long arg);
-#endif
-
-void sysaufs_br_init(struct au_branch *br);
-void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-
-#define sysaufs_brs_init() do {} while (0)
-
-#else
-#define sysaufs_attr_group NULL
-
-AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
-AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj,
- struct attribute *attr, char *buf)
-AuStubVoid(sysaufs_br_init, struct au_branch *br)
-AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-
-static inline void sysaufs_brs_init(void)
-{
- sysaufs_brs = 0;
-}
-
-#endif /* CONFIG_SYSFS */
-
-#endif /* __KERNEL__ */
-#endif /* __SYSAUFS_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sysfs interface
- */
-
-#include <linux/compat.h>
-#include <linux/seq_file.h>
-#include "aufs.h"
-
-#ifdef CONFIG_AUFS_FS_MODULE
-/* this entry violates the "one line per file" policy of sysfs */
-static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr,
- char *buf)
-{
- ssize_t err;
- static char *conf =
-/* this file is generated at compiling */
-#include "conf.str"
- ;
-
- err = snprintf(buf, PAGE_SIZE, conf);
- if (unlikely(err >= PAGE_SIZE))
- err = -EFBIG;
- return err;
-}
-
-static struct kobj_attribute au_config_attr = __ATTR_RO(config);
-#endif
-
-static struct attribute *au_attr[] = {
-#ifdef CONFIG_AUFS_FS_MODULE
- &au_config_attr.attr,
-#endif
- NULL, /* need to NULL terminate the list of attributes */
-};
-
-static struct attribute_group sysaufs_attr_group_body = {
- .attrs = au_attr
-};
-
-struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
-
-/* ---------------------------------------------------------------------- */
-
-int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
-{
- int err;
-
- SiMustAnyLock(sb);
-
- err = 0;
- if (au_opt_test(au_mntflags(sb), XINO)) {
- err = au_xino_path(seq, au_sbi(sb)->si_xib);
- seq_putc(seq, '\n');
- }
- return err;
-}
-
-/*
- * the lifetime of branch is independent from the entry under sysfs.
- * sysfs handles the lifetime of the entry, and never call ->show() after it is
- * unlinked.
- */
-static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
- aufs_bindex_t bindex, int idx)
-{
- int err;
- struct path path;
- struct dentry *root;
- struct au_branch *br;
- au_br_perm_str_t perm;
-
- AuDbg("b%d\n", bindex);
-
- err = 0;
- root = sb->s_root;
- di_read_lock_parent(root, !AuLock_IR);
- br = au_sbr(sb, bindex);
-
- switch (idx) {
- case AuBrSysfs_BR:
- path.mnt = au_br_mnt(br);
- path.dentry = au_h_dptr(root, bindex);
- err = au_seq_path(seq, &path);
- if (!err) {
- au_optstr_br_perm(&perm, br->br_perm);
- seq_printf(seq, "=%s\n", perm.a);
- }
- break;
- case AuBrSysfs_BRID:
- seq_printf(seq, "%d\n", br->br_id);
- break;
- }
- di_read_unlock(root, !AuLock_IR);
- if (unlikely(err || seq_has_overflowed(seq)))
- err = -E2BIG;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct seq_file *au_seq(char *p, ssize_t len)
-{
- struct seq_file *seq;
-
- seq = kzalloc(sizeof(*seq), GFP_NOFS);
- if (seq) {
- /* mutex_init(&seq.lock); */
- seq->buf = p;
- seq->size = len;
- return seq; /* success */
- }
-
- seq = ERR_PTR(-ENOMEM);
- return seq;
-}
-
-#define SysaufsBr_PREFIX "br"
-#define SysaufsBrid_PREFIX "brid"
-
-/* todo: file size may exceed PAGE_SIZE */
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- ssize_t err;
- int idx;
- long l;
- aufs_bindex_t bbot;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct seq_file *seq;
- char *name;
- struct attribute **cattr;
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- sb = sbinfo->si_sb;
-
- /*
- * prevent a race condition between sysfs and aufs.
- * for instance, sysfs_file_read() calls sysfs_get_active_two() which
- * prohibits maintaining the sysfs entries.
- * hew we acquire read lock after sysfs_get_active_two().
- * on the other hand, the remount process may maintain the sysfs/aufs
- * entries after acquiring write lock.
- * it can cause a deadlock.
- * simply we gave up processing read here.
- */
- err = -EBUSY;
- if (unlikely(!si_noflush_read_trylock(sb)))
- goto out;
-
- seq = au_seq(buf, PAGE_SIZE);
- err = PTR_ERR(seq);
- if (IS_ERR(seq))
- goto out_unlock;
-
- name = (void *)attr->name;
- cattr = sysaufs_si_attrs;
- while (*cattr) {
- if (!strcmp(name, (*cattr)->name)) {
- err = container_of(*cattr, struct sysaufs_si_attr, attr)
- ->show(seq, sb);
- goto out_seq;
- }
- cattr++;
- }
-
- if (!strncmp(name, SysaufsBrid_PREFIX,
- sizeof(SysaufsBrid_PREFIX) - 1)) {
- idx = AuBrSysfs_BRID;
- name += sizeof(SysaufsBrid_PREFIX) - 1;
- } else if (!strncmp(name, SysaufsBr_PREFIX,
- sizeof(SysaufsBr_PREFIX) - 1)) {
- idx = AuBrSysfs_BR;
- name += sizeof(SysaufsBr_PREFIX) - 1;
- } else
- BUG();
-
- err = kstrtol(name, 10, &l);
- if (!err) {
- bbot = au_sbbot(sb);
- if (l <= bbot)
- err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx);
- else
- err = -ENOENT;
- }
-
-out_seq:
- if (!err) {
- err = seq->count;
- /* sysfs limit */
- if (unlikely(err == PAGE_SIZE))
- err = -EFBIG;
- }
- au_delayed_kfree(seq);
-out_unlock:
- si_read_unlock(sb);
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg)
-{
- int err;
- int16_t brid;
- aufs_bindex_t bindex, bbot;
- size_t sz;
- char *buf;
- struct seq_file *seq;
- struct au_branch *br;
-
- si_read_lock(sb, AuLock_FLUSH);
- bbot = au_sbbot(sb);
- err = bbot + 1;
- if (!arg)
- goto out;
-
- err = -ENOMEM;
- buf = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!buf))
- goto out;
-
- seq = au_seq(buf, PAGE_SIZE);
- err = PTR_ERR(seq);
- if (IS_ERR(seq))
- goto out_buf;
-
- sz = sizeof(*arg) - offsetof(union aufs_brinfo, path);
- for (bindex = 0; bindex <= bbot; bindex++, arg++) {
- err = !access_ok(VERIFY_WRITE, arg, sizeof(*arg));
- if (unlikely(err))
- break;
-
- br = au_sbr(sb, bindex);
- brid = br->br_id;
- BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id));
- err = __put_user(brid, &arg->id);
- if (unlikely(err))
- break;
-
- BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm));
- err = __put_user(br->br_perm, &arg->perm);
- if (unlikely(err))
- break;
-
- err = au_seq_path(seq, &br->br_path);
- if (unlikely(err))
- break;
- seq_putc(seq, '\0');
- if (!seq_has_overflowed(seq)) {
- err = copy_to_user(arg->path, seq->buf, seq->count);
- seq->count = 0;
- if (unlikely(err))
- break;
- } else {
- err = -E2BIG;
- goto out_seq;
- }
- }
- if (unlikely(err))
- err = -EFAULT;
-
-out_seq:
- au_delayed_kfree(seq);
-out_buf:
- au_delayed_free_page((unsigned long)buf);
-out:
- si_read_unlock(sb);
- return err;
-}
-
-long au_brinfo_ioctl(struct file *file, unsigned long arg)
-{
- return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg);
-}
-
-#ifdef CONFIG_COMPAT
-long au_brinfo_compat_ioctl(struct file *file, unsigned long arg)
-{
- return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg));
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-void sysaufs_br_init(struct au_branch *br)
-{
- int i;
- struct au_brsysfs *br_sysfs;
- struct attribute *attr;
-
- br_sysfs = br->br_sysfs;
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- attr = &br_sysfs->attr;
- sysfs_attr_init(attr);
- attr->name = br_sysfs->name;
- attr->mode = S_IRUGO;
- br_sysfs++;
- }
-}
-
-void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_branch *br;
- struct kobject *kobj;
- struct au_brsysfs *br_sysfs;
- int i;
- aufs_bindex_t bbot;
-
- dbgaufs_brs_del(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bbot = au_sbbot(sb);
- for (; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- br_sysfs = br->br_sysfs;
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- sysfs_remove_file(kobj, &br_sysfs->attr);
- br_sysfs++;
- }
- }
-}
-
-void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err, i;
- aufs_bindex_t bbot;
- struct kobject *kobj;
- struct au_branch *br;
- struct au_brsysfs *br_sysfs;
-
- dbgaufs_brs_add(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bbot = au_sbbot(sb);
- for (; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- br_sysfs = br->br_sysfs;
- snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name),
- SysaufsBr_PREFIX "%d", bindex);
- snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name),
- SysaufsBrid_PREFIX "%d", bindex);
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- err = sysfs_create_file(kobj, &br_sysfs->attr);
- if (unlikely(err))
- pr_warn("failed %s under sysfs(%d)\n",
- br_sysfs->name, err);
- br_sysfs++;
- }
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * magic sysrq hanlder
- */
-
-/* #include <linux/sysrq.h> */
-#include <linux/writeback.h>
-#include "aufs.h"
-
-/* ---------------------------------------------------------------------- */
-
-static void sysrq_sb(struct super_block *sb)
-{
- char *plevel;
- struct au_sbinfo *sbinfo;
- struct file *file;
- struct au_sphlhead *files;
- struct au_finfo *finfo;
-
- plevel = au_plevel;
- au_plevel = KERN_WARNING;
-
- /* since we define pr_fmt, call printk directly */
-#define pr(str) printk(KERN_WARNING AUFS_NAME ": " str)
-
- sbinfo = au_sbi(sb);
- printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo));
- pr("superblock\n");
- au_dpri_sb(sb);
-
-#if 0
- pr("root dentry\n");
- au_dpri_dentry(sb->s_root);
- pr("root inode\n");
- au_dpri_inode(d_inode(sb->s_root));
-#endif
-
-#if 0
- do {
- int err, i, j, ndentry;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
-
- err = au_dpages_init(&dpages, GFP_ATOMIC);
- if (unlikely(err))
- break;
- err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL);
- if (!err)
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++)
- au_dpri_dentry(dpage->dentries[j]);
- }
- au_dpages_free(&dpages);
- } while (0);
-#endif
-
-#if 1
- {
- struct inode *i;
-
- pr("isolated inode\n");
- spin_lock(&sb->s_inode_list_lock);
- list_for_each_entry(i, &sb->s_inodes, i_sb_list) {
- spin_lock(&i->i_lock);
- if (1 || hlist_empty(&i->i_dentry))
- au_dpri_inode(i);
- spin_unlock(&i->i_lock);
- }
- spin_unlock(&sb->s_inode_list_lock);
- }
-#endif
- pr("files\n");
- files = &au_sbi(sb)->si_files;
- spin_lock(&files->spin);
- hlist_for_each_entry(finfo, &files->head, fi_hlist) {
- umode_t mode;
-
- file = finfo->fi_file;
- mode = file_inode(file)->i_mode;
- if (!special_file(mode))
- au_dpri_file(file);
- }
- spin_unlock(&files->spin);
- pr("done\n");
-
-#undef pr
- au_plevel = plevel;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* module parameter */
-static char *aufs_sysrq_key = "a";
-module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
-MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
-
-static void au_sysrq(int key __maybe_unused)
-{
- struct au_sbinfo *sbinfo;
-
- lockdep_off();
- au_sbilist_lock();
- hlist_for_each_entry(sbinfo, &au_sbilist.head, si_list)
- sysrq_sb(sbinfo->si_sb);
- au_sbilist_unlock();
- lockdep_on();
-}
-
-static struct sysrq_key_op au_sysrq_op = {
- .handler = au_sysrq,
- .help_msg = "Aufs",
- .action_msg = "Aufs",
- .enable_mask = SYSRQ_ENABLE_DUMP
-};
-
-/* ---------------------------------------------------------------------- */
-
-int __init au_sysrq_init(void)
-{
- int err;
- char key;
-
- err = -1;
- key = *aufs_sysrq_key;
- if ('a' <= key && key <= 'z')
- err = register_sysrq_key(key, &au_sysrq_op);
- if (unlikely(err))
- pr_err("err %d, sysrq=%c\n", err, key);
- return err;
-}
-
-void au_sysrq_fin(void)
-{
- int err;
-
- err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
- if (unlikely(err))
- pr_err("err %d (ignored)\n", err);
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * virtual or vertical directory
- */
-
-#include "aufs.h"
-
-static unsigned int calc_size(int nlen)
-{
- return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t));
-}
-
-static int set_deblk_end(union au_vdir_deblk_p *p,
- union au_vdir_deblk_p *deblk_end)
-{
- if (calc_size(0) <= deblk_end->deblk - p->deblk) {
- p->de->de_str.len = 0;
- /* smp_mb(); */
- return 0;
- }
- return -1; /* error */
-}
-
-/* returns true or false */
-static int is_deblk_end(union au_vdir_deblk_p *p,
- union au_vdir_deblk_p *deblk_end)
-{
- if (calc_size(0) <= deblk_end->deblk - p->deblk)
- return !p->de->de_str.len;
- return 1;
-}
-
-static unsigned char *last_deblk(struct au_vdir *vdir)
-{
- return vdir->vd_deblk[vdir->vd_nblk - 1];
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* estimate the appropriate size for name hash table */
-unsigned int au_rdhash_est(loff_t sz)
-{
- unsigned int n;
-
- n = UINT_MAX;
- sz >>= 10;
- if (sz < n)
- n = sz;
- if (sz < AUFS_RDHASH_DEF)
- n = AUFS_RDHASH_DEF;
- /* pr_info("n %u\n", n); */
- return n;
-}
-
-/*
- * the allocated memory has to be freed by
- * au_nhash_wh_free() or au_nhash_de_free().
- */
-int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp)
-{
- struct hlist_head *head;
- unsigned int u;
- size_t sz;
-
- sz = sizeof(*nhash->nh_head) * num_hash;
- head = kmalloc(sz, gfp);
- if (head) {
- nhash->nh_num = num_hash;
- nhash->nh_head = head;
- for (u = 0; u < num_hash; u++)
- INIT_HLIST_HEAD(head++);
- return 0; /* success */
- }
-
- return -ENOMEM;
-}
-
-static void nhash_count(struct hlist_head *head)
-{
-#if 0
- unsigned long n;
- struct hlist_node *pos;
-
- n = 0;
- hlist_for_each(pos, head)
- n++;
- pr_info("%lu\n", n);
-#endif
-}
-
-static void au_nhash_wh_do_free(struct hlist_head *head)
-{
- struct au_vdir_wh *pos;
- struct hlist_node *node;
-
- hlist_for_each_entry_safe(pos, node, head, wh_hash)
- au_delayed_kfree(pos);
-}
-
-static void au_nhash_de_do_free(struct hlist_head *head)
-{
- struct au_vdir_dehstr *pos;
- struct hlist_node *node;
-
- hlist_for_each_entry_safe(pos, node, head, hash)
- au_cache_dfree_vdir_dehstr(pos);
-}
-
-static void au_nhash_do_free(struct au_nhash *nhash,
- void (*free)(struct hlist_head *head))
-{
- unsigned int n;
- struct hlist_head *head;
-
- n = nhash->nh_num;
- if (!n)
- return;
-
- head = nhash->nh_head;
- while (n-- > 0) {
- nhash_count(head);
- free(head++);
- }
- au_delayed_kfree(nhash->nh_head);
-}
-
-void au_nhash_wh_free(struct au_nhash *whlist)
-{
- au_nhash_do_free(whlist, au_nhash_wh_do_free);
-}
-
-static void au_nhash_de_free(struct au_nhash *delist)
-{
- au_nhash_do_free(delist, au_nhash_de_do_free);
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
- int limit)
-{
- int num;
- unsigned int u, n;
- struct hlist_head *head;
- struct au_vdir_wh *pos;
-
- num = 0;
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (u = 0; u < n; u++, head++)
- hlist_for_each_entry(pos, head, wh_hash)
- if (pos->wh_bindex == btgt && ++num > limit)
- return 1;
- return 0;
-}
-
-static struct hlist_head *au_name_hash(struct au_nhash *nhash,
- unsigned char *name,
- unsigned int len)
-{
- unsigned int v;
- /* const unsigned int magic_bit = 12; */
-
- AuDebugOn(!nhash->nh_num || !nhash->nh_head);
-
- v = 0;
- if (len > 8)
- len = 8;
- while (len--)
- v += *name++;
- /* v = hash_long(v, magic_bit); */
- v %= nhash->nh_num;
- return nhash->nh_head + v;
-}
-
-static int au_nhash_test_name(struct au_vdir_destr *str, const char *name,
- int nlen)
-{
- return str->len == nlen && !memcmp(str->name, name, nlen);
-}
-
-/* returns found or not */
-int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen)
-{
- struct hlist_head *head;
- struct au_vdir_wh *pos;
- struct au_vdir_destr *str;
-
- head = au_name_hash(whlist, name, nlen);
- hlist_for_each_entry(pos, head, wh_hash) {
- str = &pos->wh_str;
- AuDbg("%.*s\n", str->len, str->name);
- if (au_nhash_test_name(str, name, nlen))
- return 1;
- }
- return 0;
-}
-
-/* returns found(true) or not */
-static int test_known(struct au_nhash *delist, char *name, int nlen)
-{
- struct hlist_head *head;
- struct au_vdir_dehstr *pos;
- struct au_vdir_destr *str;
-
- head = au_name_hash(delist, name, nlen);
- hlist_for_each_entry(pos, head, hash) {
- str = pos->str;
- AuDbg("%.*s\n", str->len, str->name);
- if (au_nhash_test_name(str, name, nlen))
- return 1;
- }
- return 0;
-}
-
-static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino,
- unsigned char d_type)
-{
-#ifdef CONFIG_AUFS_SHWH
- wh->wh_ino = ino;
- wh->wh_type = d_type;
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
- unsigned int d_type, aufs_bindex_t bindex,
- unsigned char shwh)
-{
- int err;
- struct au_vdir_destr *str;
- struct au_vdir_wh *wh;
-
- AuDbg("%.*s\n", nlen, name);
- AuDebugOn(!whlist->nh_num || !whlist->nh_head);
-
- err = -ENOMEM;
- wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS);
- if (unlikely(!wh))
- goto out;
-
- err = 0;
- wh->wh_bindex = bindex;
- if (shwh)
- au_shwh_init_wh(wh, ino, d_type);
- str = &wh->wh_str;
- str->len = nlen;
- memcpy(str->name, name, nlen);
- hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen));
- /* smp_mb(); */
-
-out:
- return err;
-}
-
-static int append_deblk(struct au_vdir *vdir)
-{
- int err;
- unsigned long ul;
- const unsigned int deblk_sz = vdir->vd_deblk_sz;
- union au_vdir_deblk_p p, deblk_end;
- unsigned char **o;
-
- err = -ENOMEM;
- o = au_krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1),
- GFP_NOFS, /*may_shrink*/0);
- if (unlikely(!o))
- goto out;
-
- vdir->vd_deblk = o;
- p.deblk = kmalloc(deblk_sz, GFP_NOFS);
- if (p.deblk) {
- ul = vdir->vd_nblk++;
- vdir->vd_deblk[ul] = p.deblk;
- vdir->vd_last.ul = ul;
- vdir->vd_last.p.deblk = p.deblk;
- deblk_end.deblk = p.deblk + deblk_sz;
- err = set_deblk_end(&p, &deblk_end);
- }
-
-out:
- return err;
-}
-
-static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino,
- unsigned int d_type, struct au_nhash *delist)
-{
- int err;
- unsigned int sz;
- const unsigned int deblk_sz = vdir->vd_deblk_sz;
- union au_vdir_deblk_p p, *room, deblk_end;
- struct au_vdir_dehstr *dehstr;
-
- p.deblk = last_deblk(vdir);
- deblk_end.deblk = p.deblk + deblk_sz;
- room = &vdir->vd_last.p;
- AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk
- || !is_deblk_end(room, &deblk_end));
-
- sz = calc_size(nlen);
- if (unlikely(sz > deblk_end.deblk - room->deblk)) {
- err = append_deblk(vdir);
- if (unlikely(err))
- goto out;
-
- p.deblk = last_deblk(vdir);
- deblk_end.deblk = p.deblk + deblk_sz;
- /* smp_mb(); */
- AuDebugOn(room->deblk != p.deblk);
- }
-
- err = -ENOMEM;
- dehstr = au_cache_alloc_vdir_dehstr();
- if (unlikely(!dehstr))
- goto out;
-
- dehstr->str = &room->de->de_str;
- hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen));
- room->de->de_ino = ino;
- room->de->de_type = d_type;
- room->de->de_str.len = nlen;
- memcpy(room->de->de_str.name, name, nlen);
-
- err = 0;
- room->deblk += sz;
- if (unlikely(set_deblk_end(room, &deblk_end)))
- err = append_deblk(vdir);
- /* smp_mb(); */
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_vdir_free(struct au_vdir *vdir, int atonce)
-{
- unsigned char **deblk;
-
- deblk = vdir->vd_deblk;
- if (!atonce) {
- while (vdir->vd_nblk--)
- au_delayed_kfree(*deblk++);
- au_delayed_kfree(vdir->vd_deblk);
- au_cache_dfree_vdir(vdir);
- } else {
- /* not delayed */
- while (vdir->vd_nblk--)
- kfree(*deblk++);
- kfree(vdir->vd_deblk);
- au_cache_free_vdir(vdir);
- }
-}
-
-static struct au_vdir *alloc_vdir(struct file *file)
-{
- struct au_vdir *vdir;
- struct super_block *sb;
- int err;
-
- sb = file->f_path.dentry->d_sb;
- SiMustAnyLock(sb);
-
- err = -ENOMEM;
- vdir = au_cache_alloc_vdir();
- if (unlikely(!vdir))
- goto out;
-
- vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS);
- if (unlikely(!vdir->vd_deblk))
- goto out_free;
-
- vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk;
- if (!vdir->vd_deblk_sz) {
- /* estimate the appropriate size for deblk */
- vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL);
- /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */
- }
- vdir->vd_nblk = 0;
- vdir->vd_version = 0;
- vdir->vd_jiffy = 0;
- err = append_deblk(vdir);
- if (!err)
- return vdir; /* success */
-
- au_delayed_kfree(vdir->vd_deblk);
-
-out_free:
- au_cache_dfree_vdir(vdir);
-out:
- vdir = ERR_PTR(err);
- return vdir;
-}
-
-static int reinit_vdir(struct au_vdir *vdir)
-{
- int err;
- union au_vdir_deblk_p p, deblk_end;
-
- while (vdir->vd_nblk > 1) {
- au_delayed_kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
- /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */
- vdir->vd_nblk--;
- }
- p.deblk = vdir->vd_deblk[0];
- deblk_end.deblk = p.deblk + vdir->vd_deblk_sz;
- err = set_deblk_end(&p, &deblk_end);
- /* keep vd_dblk_sz */
- vdir->vd_last.ul = 0;
- vdir->vd_last.p.deblk = vdir->vd_deblk[0];
- vdir->vd_version = 0;
- vdir->vd_jiffy = 0;
- /* smp_mb(); */
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define AuFillVdir_CALLED 1
-#define AuFillVdir_WHABLE (1 << 1)
-#define AuFillVdir_SHWH (1 << 2)
-#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name)
-#define au_fset_fillvdir(flags, name) \
- do { (flags) |= AuFillVdir_##name; } while (0)
-#define au_fclr_fillvdir(flags, name) \
- do { (flags) &= ~AuFillVdir_##name; } while (0)
-
-#ifndef CONFIG_AUFS_SHWH
-#undef AuFillVdir_SHWH
-#define AuFillVdir_SHWH 0
-#endif
-
-struct fillvdir_arg {
- struct dir_context ctx;
- struct file *file;
- struct au_vdir *vdir;
- struct au_nhash delist;
- struct au_nhash whlist;
- aufs_bindex_t bindex;
- unsigned int flags;
- int err;
-};
-
-static int fillvdir(struct dir_context *ctx, const char *__name, int nlen,
- loff_t offset __maybe_unused, u64 h_ino,
- unsigned int d_type)
-{
- struct fillvdir_arg *arg = container_of(ctx, struct fillvdir_arg, ctx);
- char *name = (void *)__name;
- struct super_block *sb;
- ino_t ino;
- const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH);
-
- arg->err = 0;
- sb = arg->file->f_path.dentry->d_sb;
- au_fset_fillvdir(arg->flags, CALLED);
- /* smp_mb(); */
- if (nlen <= AUFS_WH_PFX_LEN
- || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
- if (test_known(&arg->delist, name, nlen)
- || au_nhash_test_known_wh(&arg->whlist, name, nlen))
- goto out; /* already exists or whiteouted */
-
- arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino);
- if (!arg->err) {
- if (unlikely(nlen > AUFS_MAX_NAMELEN))
- d_type = DT_UNKNOWN;
- arg->err = append_de(arg->vdir, name, nlen, ino,
- d_type, &arg->delist);
- }
- } else if (au_ftest_fillvdir(arg->flags, WHABLE)) {
- name += AUFS_WH_PFX_LEN;
- nlen -= AUFS_WH_PFX_LEN;
- if (au_nhash_test_known_wh(&arg->whlist, name, nlen))
- goto out; /* already whiteouted */
-
- if (shwh)
- arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type,
- &ino);
- if (!arg->err) {
- if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN)
- d_type = DT_UNKNOWN;
- arg->err = au_nhash_append_wh
- (&arg->whlist, name, nlen, ino, d_type,
- arg->bindex, shwh);
- }
- }
-
-out:
- if (!arg->err)
- arg->vdir->vd_jiffy = jiffies;
- /* smp_mb(); */
- AuTraceErr(arg->err);
- return arg->err;
-}
-
-static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir,
- struct au_nhash *whlist, struct au_nhash *delist)
-{
-#ifdef CONFIG_AUFS_SHWH
- int err;
- unsigned int nh, u;
- struct hlist_head *head;
- struct au_vdir_wh *pos;
- struct hlist_node *n;
- char *p, *o;
- struct au_vdir_destr *destr;
-
- AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH));
-
- err = -ENOMEM;
- o = p = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!p))
- goto out;
-
- err = 0;
- nh = whlist->nh_num;
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- p += AUFS_WH_PFX_LEN;
- for (u = 0; u < nh; u++) {
- head = whlist->nh_head + u;
- hlist_for_each_entry_safe(pos, n, head, wh_hash) {
- destr = &pos->wh_str;
- memcpy(p, destr->name, destr->len);
- err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN,
- pos->wh_ino, pos->wh_type, delist);
- if (unlikely(err))
- break;
- }
- }
-
- au_delayed_free_page((unsigned long)o);
-
-out:
- AuTraceErr(err);
- return err;
-#else
- return 0;
-#endif
-}
-
-static int au_do_read_vdir(struct fillvdir_arg *arg)
-{
- int err;
- unsigned int rdhash;
- loff_t offset;
- aufs_bindex_t bbot, bindex, btop;
- unsigned char shwh;
- struct file *hf, *file;
- struct super_block *sb;
-
- file = arg->file;
- sb = file->f_path.dentry->d_sb;
- SiMustAnyLock(sb);
-
- rdhash = au_sbi(sb)->si_rdhash;
- if (!rdhash)
- rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL));
- err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out;
- err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS);
- if (unlikely(err))
- goto out_delist;
-
- err = 0;
- arg->flags = 0;
- shwh = 0;
- if (au_opt_test(au_mntflags(sb), SHWH)) {
- shwh = 1;
- au_fset_fillvdir(arg->flags, SHWH);
- }
- btop = au_fbtop(file);
- bbot = au_fbbot_dir(file);
- for (bindex = btop; !err && bindex <= bbot; bindex++) {
- hf = au_hf_dir(file, bindex);
- if (!hf)
- continue;
-
- offset = vfsub_llseek(hf, 0, SEEK_SET);
- err = offset;
- if (unlikely(offset))
- break;
-
- arg->bindex = bindex;
- au_fclr_fillvdir(arg->flags, WHABLE);
- if (shwh
- || (bindex != bbot
- && au_br_whable(au_sbr_perm(sb, bindex))))
- au_fset_fillvdir(arg->flags, WHABLE);
- do {
- arg->err = 0;
- au_fclr_fillvdir(arg->flags, CALLED);
- /* smp_mb(); */
- err = vfsub_iterate_dir(hf, &arg->ctx);
- if (err >= 0)
- err = arg->err;
- } while (!err && au_ftest_fillvdir(arg->flags, CALLED));
-
- /*
- * dir_relax() may be good for concurrency, but aufs should not
- * use it since it will cause a lockdep problem.
- */
- }
-
- if (!err && shwh)
- err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist);
-
- au_nhash_wh_free(&arg->whlist);
-
-out_delist:
- au_nhash_de_free(&arg->delist);
-out:
- return err;
-}
-
-static int read_vdir(struct file *file, int may_read)
-{
- int err;
- unsigned long expire;
- unsigned char do_read;
- struct fillvdir_arg arg = {
- .ctx = {
- .actor = fillvdir
- }
- };
- struct inode *inode;
- struct au_vdir *vdir, *allocated;
-
- err = 0;
- inode = file_inode(file);
- IMustLock(inode);
- IiMustWriteLock(inode);
- SiMustAnyLock(inode->i_sb);
-
- allocated = NULL;
- do_read = 0;
- expire = au_sbi(inode->i_sb)->si_rdcache;
- vdir = au_ivdir(inode);
- if (!vdir) {
- do_read = 1;
- vdir = alloc_vdir(file);
- err = PTR_ERR(vdir);
- if (IS_ERR(vdir))
- goto out;
- err = 0;
- allocated = vdir;
- } else if (may_read
- && (inode->i_version != vdir->vd_version
- || time_after(jiffies, vdir->vd_jiffy + expire))) {
- do_read = 1;
- err = reinit_vdir(vdir);
- if (unlikely(err))
- goto out;
- }
-
- if (!do_read)
- return 0; /* success */
-
- arg.file = file;
- arg.vdir = vdir;
- err = au_do_read_vdir(&arg);
- if (!err) {
- /* file->f_pos = 0; */ /* todo: ctx->pos? */
- vdir->vd_version = inode->i_version;
- vdir->vd_last.ul = 0;
- vdir->vd_last.p.deblk = vdir->vd_deblk[0];
- if (allocated)
- au_set_ivdir(inode, allocated);
- } else if (allocated)
- au_vdir_free(allocated, /*atonce*/0);
-
-out:
- return err;
-}
-
-static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src)
-{
- int err, rerr;
- unsigned long ul, n;
- const unsigned int deblk_sz = src->vd_deblk_sz;
-
- AuDebugOn(tgt->vd_nblk != 1);
-
- err = -ENOMEM;
- if (tgt->vd_nblk < src->vd_nblk) {
- unsigned char **p;
-
- p = au_krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk,
- GFP_NOFS, /*may_shrink*/0);
- if (unlikely(!p))
- goto out;
- tgt->vd_deblk = p;
- }
-
- if (tgt->vd_deblk_sz != deblk_sz) {
- unsigned char *p;
-
- tgt->vd_deblk_sz = deblk_sz;
- p = au_krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS,
- /*may_shrink*/1);
- if (unlikely(!p))
- goto out;
- tgt->vd_deblk[0] = p;
- }
- memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz);
- tgt->vd_version = src->vd_version;
- tgt->vd_jiffy = src->vd_jiffy;
-
- n = src->vd_nblk;
- for (ul = 1; ul < n; ul++) {
- tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz,
- GFP_NOFS);
- if (unlikely(!tgt->vd_deblk[ul]))
- goto out;
- tgt->vd_nblk++;
- }
- tgt->vd_nblk = n;
- tgt->vd_last.ul = tgt->vd_last.ul;
- tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul];
- tgt->vd_last.p.deblk += src->vd_last.p.deblk
- - src->vd_deblk[src->vd_last.ul];
- /* smp_mb(); */
- return 0; /* success */
-
-out:
- rerr = reinit_vdir(tgt);
- BUG_ON(rerr);
- return err;
-}
-
-int au_vdir_init(struct file *file)
-{
- int err;
- struct inode *inode;
- struct au_vdir *vdir_cache, *allocated;
-
- /* test file->f_pos here instead of ctx->pos */
- err = read_vdir(file, !file->f_pos);
- if (unlikely(err))
- goto out;
-
- allocated = NULL;
- vdir_cache = au_fvdir_cache(file);
- if (!vdir_cache) {
- vdir_cache = alloc_vdir(file);
- err = PTR_ERR(vdir_cache);
- if (IS_ERR(vdir_cache))
- goto out;
- allocated = vdir_cache;
- } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
- /* test file->f_pos here instead of ctx->pos */
- err = reinit_vdir(vdir_cache);
- if (unlikely(err))
- goto out;
- } else
- return 0; /* success */
-
- inode = file_inode(file);
- err = copy_vdir(vdir_cache, au_ivdir(inode));
- if (!err) {
- file->f_version = inode->i_version;
- if (allocated)
- au_set_fvdir_cache(file, allocated);
- } else if (allocated)
- au_vdir_free(allocated, /*atonce*/0);
-
-out:
- return err;
-}
-
-static loff_t calc_offset(struct au_vdir *vdir)
-{
- loff_t offset;
- union au_vdir_deblk_p p;
-
- p.deblk = vdir->vd_deblk[vdir->vd_last.ul];
- offset = vdir->vd_last.p.deblk - p.deblk;
- offset += vdir->vd_deblk_sz * vdir->vd_last.ul;
- return offset;
-}
-
-/* returns true or false */
-static int seek_vdir(struct file *file, struct dir_context *ctx)
-{
- int valid;
- unsigned int deblk_sz;
- unsigned long ul, n;
- loff_t offset;
- union au_vdir_deblk_p p, deblk_end;
- struct au_vdir *vdir_cache;
-
- valid = 1;
- vdir_cache = au_fvdir_cache(file);
- offset = calc_offset(vdir_cache);
- AuDbg("offset %lld\n", offset);
- if (ctx->pos == offset)
- goto out;
-
- vdir_cache->vd_last.ul = 0;
- vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
- if (!ctx->pos)
- goto out;
-
- valid = 0;
- deblk_sz = vdir_cache->vd_deblk_sz;
- ul = div64_u64(ctx->pos, deblk_sz);
- AuDbg("ul %lu\n", ul);
- if (ul >= vdir_cache->vd_nblk)
- goto out;
-
- n = vdir_cache->vd_nblk;
- for (; ul < n; ul++) {
- p.deblk = vdir_cache->vd_deblk[ul];
- deblk_end.deblk = p.deblk + deblk_sz;
- offset = ul;
- offset *= deblk_sz;
- while (!is_deblk_end(&p, &deblk_end) && offset < ctx->pos) {
- unsigned int l;
-
- l = calc_size(p.de->de_str.len);
- offset += l;
- p.deblk += l;
- }
- if (!is_deblk_end(&p, &deblk_end)) {
- valid = 1;
- vdir_cache->vd_last.ul = ul;
- vdir_cache->vd_last.p = p;
- break;
- }
- }
-
-out:
- /* smp_mb(); */
- AuTraceErr(!valid);
- return valid;
-}
-
-int au_vdir_fill_de(struct file *file, struct dir_context *ctx)
-{
- unsigned int l, deblk_sz;
- union au_vdir_deblk_p deblk_end;
- struct au_vdir *vdir_cache;
- struct au_vdir_de *de;
-
- vdir_cache = au_fvdir_cache(file);
- if (!seek_vdir(file, ctx))
- return 0;
-
- deblk_sz = vdir_cache->vd_deblk_sz;
- while (1) {
- deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
- deblk_end.deblk += deblk_sz;
- while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
- de = vdir_cache->vd_last.p.de;
- AuDbg("%.*s, off%lld, i%lu, dt%d\n",
- de->de_str.len, de->de_str.name, ctx->pos,
- (unsigned long)de->de_ino, de->de_type);
- if (unlikely(!dir_emit(ctx, de->de_str.name,
- de->de_str.len, de->de_ino,
- de->de_type))) {
- /* todo: ignore the error caused by udba? */
- /* return err; */
- return 0;
- }
-
- l = calc_size(de->de_str.len);
- vdir_cache->vd_last.p.deblk += l;
- ctx->pos += l;
- }
- if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) {
- vdir_cache->vd_last.ul++;
- vdir_cache->vd_last.p.deblk
- = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
- ctx->pos = deblk_sz * vdir_cache->vd_last.ul;
- continue;
- }
- break;
- }
-
- /* smp_mb(); */
- return 0;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for VFS
- */
-
-#include <linux/namei.h>
-#include <linux/nsproxy.h>
-#include <linux/security.h>
-#include <linux/splice.h>
-#include "../fs/mount.h"
-#include "aufs.h"
-
-#ifdef CONFIG_AUFS_BR_FUSE
-int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb)
-{
- struct nsproxy *ns;
-
- if (!au_test_fuse(h_sb) || !au_userns)
- return 0;
-
- ns = current->nsproxy;
- /* no {get,put}_nsproxy(ns) */
- return real_mount(mnt)->mnt_ns == ns->mnt_ns ? 0 : -EACCES;
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_update_h_iattr(struct path *h_path, int *did)
-{
- int err;
- struct kstat st;
- struct super_block *h_sb;
-
- /* for remote fs, leave work for its getattr or d_revalidate */
- /* for bad i_attr fs, handle them in aufs_getattr() */
- /* still some fs may acquire i_mutex. we need to skip them */
- err = 0;
- if (!did)
- did = &err;
- h_sb = h_path->dentry->d_sb;
- *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
- if (*did)
- err = vfs_getattr(h_path, &st);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct file *vfsub_dentry_open(struct path *path, int flags)
-{
- struct file *file;
-
- file = dentry_open(path, flags /* | __FMODE_NONOTIFY */,
- current_cred());
- if (!IS_ERR_OR_NULL(file)
- && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
- i_readcount_inc(d_inode(path->dentry));
-
- return file;
-}
-
-struct file *vfsub_filp_open(const char *path, int oflags, int mode)
-{
- struct file *file;
-
- lockdep_off();
- file = filp_open(path,
- oflags /* | __FMODE_NONOTIFY */,
- mode);
- lockdep_on();
- if (IS_ERR(file))
- goto out;
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-
-out:
- return file;
-}
-
-/*
- * Ideally this function should call VFS:do_last() in order to keep all its
- * checkings. But it is very hard for aufs to regenerate several VFS internal
- * structure such as nameidata. This is a second (or third) best approach.
- * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open().
- */
-int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
- struct vfsub_aopen_args *args, struct au_branch *br)
-{
- int err;
- struct file *file = args->file;
- /* copied from linux/fs/namei.c:atomic_open() */
- struct dentry *const DENTRY_NOT_SET = (void *)-1UL;
-
- IMustLock(dir);
- AuDebugOn(!dir->i_op->atomic_open);
-
- err = au_br_test_oflag(args->open_flag, br);
- if (unlikely(err))
- goto out;
-
- args->file->f_path.dentry = DENTRY_NOT_SET;
- args->file->f_path.mnt = au_br_mnt(br);
- err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag,
- args->create_mode, args->opened);
- if (err >= 0) {
- /* some filesystems don't set FILE_CREATED while succeeded? */
- if (*args->opened & FILE_CREATED)
- fsnotify_create(dir, dentry);
- } else
- goto out;
-
-
- if (!err) {
- /* todo: call VFS:may_open() here */
- err = open_check_o_direct(file);
- /* todo: ima_file_check() too? */
- if (!err && (args->open_flag & __FMODE_EXEC))
- err = deny_write_access(file);
- if (unlikely(err))
- /* note that the file is created and still opened */
- goto out;
- }
-
- au_br_get(br);
- fsnotify_open(file);
-
-out:
- return err;
-}
-
-int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
-{
- int err;
-
- err = kern_path(name, flags, path);
- if (!err && d_is_positive(path->dentry))
- vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-struct dentry *vfsub_lookup_one_len_unlocked(const char *name,
- struct dentry *parent, int len)
-{
- struct path path = {
- .mnt = NULL
- };
-
- path.dentry = lookup_one_len_unlocked(name, parent, len);
- if (IS_ERR(path.dentry))
- goto out;
- if (d_is_positive(path.dentry))
- vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-
-out:
- AuTraceErrPtr(path.dentry);
- return path.dentry;
-}
-
-struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
- int len)
-{
- struct path path = {
- .mnt = NULL
- };
-
- /* VFS checks it too, but by WARN_ON_ONCE() */
- IMustLock(d_inode(parent));
-
- path.dentry = lookup_one_len(name, parent, len);
- if (IS_ERR(path.dentry))
- goto out;
- if (d_is_positive(path.dentry))
- vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-
-out:
- AuTraceErrPtr(path.dentry);
- return path.dentry;
-}
-
-void vfsub_call_lkup_one(void *args)
-{
- struct vfsub_lkup_one_args *a = args;
- *a->errp = vfsub_lkup_one(a->name, a->parent);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2)
-{
- struct dentry *d;
-
- lockdep_off();
- d = lock_rename(d1, d2);
- lockdep_on();
- au_hn_suspend(hdir1);
- if (hdir1 != hdir2)
- au_hn_suspend(hdir2);
-
- return d;
-}
-
-void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2)
-{
- au_hn_resume(hdir1);
- if (hdir1 != hdir2)
- au_hn_resume(hdir2);
- lockdep_off();
- unlock_rename(d1, d2);
- lockdep_on();
-}
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mknod(path, d, mode, 0);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_create(dir, path->dentry, mode, want_excl);
- lockdep_on();
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_symlink(path, d, symname);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_symlink(dir, path->dentry, symname);
- lockdep_on();
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mknod(path, d, mode, new_encode_dev(dev));
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_mknod(dir, path->dentry, mode, dev);
- lockdep_on();
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-static int au_test_nlink(struct inode *inode)
-{
- const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
-
- if (!au_test_fs_no_limit_nlink(inode->i_sb)
- || inode->i_nlink < link_max)
- return 0;
- return -EMLINK;
-}
-
-int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path,
- struct inode **delegated_inode)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- err = au_test_nlink(d_inode(src_dentry));
- if (unlikely(err))
- return err;
-
- /* we don't call may_linkat() */
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_link(src_dentry, path, d);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_link(src_dentry, dir, path->dentry, delegated_inode);
- lockdep_on();
- if (!err) {
- struct path tmp = *path;
- int did;
-
- /* fuse has different memory inode for the same inumber */
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- tmp.dentry = src_dentry;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
- struct inode *dir, struct path *path,
- struct inode **delegated_inode)
-{
- int err;
- struct path tmp = {
- .mnt = path->mnt
- };
- struct dentry *d;
-
- IMustLock(dir);
- IMustLock(src_dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- tmp.dentry = src_dentry->d_parent;
- err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_rename(src_dir, src_dentry, dir, path->dentry,
- delegated_inode, /*flags*/0);
- lockdep_on();
- if (!err) {
- int did;
-
- tmp.dentry = d->d_parent;
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = src_dentry;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- tmp.dentry = src_dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_mkdir(path, d, mode);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_mkdir(dir, path->dentry, mode);
- lockdep_on();
- if (!err) {
- struct path tmp = *path;
- int did;
-
- vfsub_update_h_iattr(&tmp, &did);
- if (did) {
- tmp.dentry = path->dentry->d_parent;
- vfsub_update_h_iattr(&tmp, /*did*/NULL);
- }
- /*ignore*/
- }
-
-out:
- return err;
-}
-
-int vfsub_rmdir(struct inode *dir, struct path *path)
-{
- int err;
- struct dentry *d;
-
- IMustLock(dir);
-
- d = path->dentry;
- path->dentry = d->d_parent;
- err = security_path_rmdir(path, d);
- path->dentry = d;
- if (unlikely(err))
- goto out;
-
- lockdep_off();
- err = vfs_rmdir(dir, path->dentry);
- lockdep_on();
- if (!err) {
- struct path tmp = {
- .dentry = path->dentry->d_parent,
- .mnt = path->mnt
- };
-
- vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
- }
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: support mmap_sem? */
-ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
-
- lockdep_off();
- err = vfs_read(file, ubuf, count, ppos);
- lockdep_on();
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-/* todo: kernel_read()? */
-ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
- mm_segment_t oldfs;
- union {
- void *k;
- char __user *u;
- } buf;
-
- buf.k = kbuf;
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = vfsub_read_u(file, buf.u, count, ppos);
- set_fs(oldfs);
- return err;
-}
-
-ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
- loff_t *ppos)
-{
- ssize_t err;
-
- lockdep_off();
- err = vfs_write(file, ubuf, count, ppos);
- lockdep_on();
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
-{
- ssize_t err;
- mm_segment_t oldfs;
- union {
- void *k;
- const char __user *u;
- } buf;
-
- buf.k = kbuf;
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = vfsub_write_u(file, buf.u, count, ppos);
- set_fs(oldfs);
- return err;
-}
-
-int vfsub_flush(struct file *file, fl_owner_t id)
-{
- int err;
-
- err = 0;
- if (file->f_op->flush) {
- if (!au_test_nfs(file->f_path.dentry->d_sb))
- err = file->f_op->flush(file, id);
- else {
- lockdep_off();
- err = file->f_op->flush(file, id);
- lockdep_on();
- }
- if (!err)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
- /*ignore*/
- }
- return err;
-}
-
-int vfsub_iterate_dir(struct file *file, struct dir_context *ctx)
-{
- int err;
-
- AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);
-
- lockdep_off();
- err = iterate_dir(file, ctx);
- lockdep_on();
- if (err >= 0)
- vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-long vfsub_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
-{
- long err;
-
- lockdep_off();
- err = do_splice_to(in, ppos, pipe, len, flags);
- lockdep_on();
- file_accessed(in);
- if (err >= 0)
- vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags)
-{
- long err;
-
- lockdep_off();
- err = do_splice_from(pipe, out, ppos, len, flags);
- lockdep_on();
- if (err >= 0)
- vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
- return err;
-}
-
-int vfsub_fsync(struct file *file, struct path *path, int datasync)
-{
- int err;
-
- /* file can be NULL */
- lockdep_off();
- err = vfs_fsync(file, datasync);
- lockdep_on();
- if (!err) {
- if (!path) {
- AuDebugOn(!file);
- path = &file->f_path;
- }
- vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
- }
- return err;
-}
-
-/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
-int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
- struct file *h_file)
-{
- int err;
- struct inode *h_inode;
- struct super_block *h_sb;
-
- if (!h_file) {
- err = vfsub_truncate(h_path, length);
- goto out;
- }
-
- h_inode = d_inode(h_path->dentry);
- h_sb = h_inode->i_sb;
- lockdep_off();
- sb_start_write(h_sb);
- lockdep_on();
- err = locks_verify_truncate(h_inode, h_file, length);
- if (!err)
- err = security_path_truncate(h_path);
- if (!err) {
- lockdep_off();
- err = do_truncate(h_path->dentry, length, attr, h_file);
- lockdep_on();
- }
- lockdep_off();
- sb_end_write(h_sb);
- lockdep_on();
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_vfsub_mkdir_args {
- int *errp;
- struct inode *dir;
- struct path *path;
- int mode;
-};
-
-static void au_call_vfsub_mkdir(void *args)
-{
- struct au_vfsub_mkdir_args *a = args;
- *a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
-}
-
-int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
-{
- int err, do_sio, wkq_err;
-
- do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
- if (!do_sio) {
- lockdep_off();
- err = vfsub_mkdir(dir, path, mode);
- lockdep_on();
- } else {
- struct au_vfsub_mkdir_args args = {
- .errp = &err,
- .dir = dir,
- .path = path,
- .mode = mode
- };
- wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-
-struct au_vfsub_rmdir_args {
- int *errp;
- struct inode *dir;
- struct path *path;
-};
-
-static void au_call_vfsub_rmdir(void *args)
-{
- struct au_vfsub_rmdir_args *a = args;
- *a->errp = vfsub_rmdir(a->dir, a->path);
-}
-
-int vfsub_sio_rmdir(struct inode *dir, struct path *path)
-{
- int err, do_sio, wkq_err;
-
- do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
- if (!do_sio) {
- lockdep_off();
- err = vfsub_rmdir(dir, path);
- lockdep_on();
- } else {
- struct au_vfsub_rmdir_args args = {
- .errp = &err,
- .dir = dir,
- .path = path
- };
- wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct notify_change_args {
- int *errp;
- struct path *path;
- struct iattr *ia;
- struct inode **delegated_inode;
-};
-
-static void call_notify_change(void *args)
-{
- struct notify_change_args *a = args;
- struct inode *h_inode;
-
- h_inode = d_inode(a->path->dentry);
- IMustLock(h_inode);
-
- *a->errp = -EPERM;
- if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
- lockdep_off();
- *a->errp = notify_change(a->path->dentry, a->ia,
- a->delegated_inode);
- lockdep_on();
- if (!*a->errp)
- vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
- }
- AuTraceErr(*a->errp);
-}
-
-int vfsub_notify_change(struct path *path, struct iattr *ia,
- struct inode **delegated_inode)
-{
- int err;
- struct notify_change_args args = {
- .errp = &err,
- .path = path,
- .ia = ia,
- .delegated_inode = delegated_inode
- };
-
- call_notify_change(&args);
-
- return err;
-}
-
-int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
- struct inode **delegated_inode)
-{
- int err, wkq_err;
- struct notify_change_args args = {
- .errp = &err,
- .path = path,
- .ia = ia,
- .delegated_inode = delegated_inode
- };
-
- wkq_err = au_wkq_wait(call_notify_change, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct unlink_args {
- int *errp;
- struct inode *dir;
- struct path *path;
- struct inode **delegated_inode;
-};
-
-static void call_unlink(void *args)
-{
- struct unlink_args *a = args;
- struct dentry *d = a->path->dentry;
- struct inode *h_inode;
- const int stop_sillyrename = (au_test_nfs(d->d_sb)
- && au_dcount(d) == 1);
-
- IMustLock(a->dir);
-
- a->path->dentry = d->d_parent;
- *a->errp = security_path_unlink(a->path, d);
- a->path->dentry = d;
- if (unlikely(*a->errp))
- return;
-
- if (!stop_sillyrename)
- dget(d);
- h_inode = NULL;
- if (d_is_positive(d)) {
- h_inode = d_inode(d);
- ihold(h_inode);
- }
-
- lockdep_off();
- *a->errp = vfs_unlink(a->dir, d, a->delegated_inode);
- lockdep_on();
- if (!*a->errp) {
- struct path tmp = {
- .dentry = d->d_parent,
- .mnt = a->path->mnt
- };
- vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
- }
-
- if (!stop_sillyrename)
- dput(d);
- if (h_inode)
- iput(h_inode);
-
- AuTraceErr(*a->errp);
-}
-
-/*
- * @dir: must be locked.
- * @dentry: target dentry.
- */
-int vfsub_unlink(struct inode *dir, struct path *path,
- struct inode **delegated_inode, int force)
-{
- int err;
- struct unlink_args args = {
- .errp = &err,
- .dir = dir,
- .path = path,
- .delegated_inode = delegated_inode
- };
-
- if (!force)
- call_unlink(&args);
- else {
- int wkq_err;
-
- wkq_err = au_wkq_wait(call_unlink, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
-
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for VFS
- */
-
-#ifndef __AUFS_VFSUB_H__
-#define __AUFS_VFSUB_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/mount.h>
-#include <linux/posix_acl.h>
-#include <linux/xattr.h>
-#include "debug.h"
-
-/* copied from linux/fs/internal.h */
-/* todo: BAD approach!! */
-extern void __mnt_drop_write(struct vfsmount *);
-extern int open_check_o_direct(struct file *f);
-
-/* ---------------------------------------------------------------------- */
-
-/* lock subclass for lower inode */
-/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
-/* reduce? gave up. */
-enum {
- AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */
- AuLsc_I_PARENT, /* lower inode, parent first */
- AuLsc_I_PARENT2, /* copyup dirs */
- AuLsc_I_PARENT3, /* copyup wh */
- AuLsc_I_CHILD,
- AuLsc_I_CHILD2,
- AuLsc_I_End
-};
-
-/* to debug easier, do not make them inlined functions */
-#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx))
-#define IMustLock(i) AuDebugOn(!inode_is_locked(i))
-
-/* ---------------------------------------------------------------------- */
-
-static inline void vfsub_drop_nlink(struct inode *inode)
-{
- AuDebugOn(!inode->i_nlink);
- drop_nlink(inode);
-}
-
-static inline void vfsub_dead_dir(struct inode *inode)
-{
- AuDebugOn(!S_ISDIR(inode->i_mode));
- inode->i_flags |= S_DEAD;
- clear_nlink(inode);
-}
-
-static inline int vfsub_native_ro(struct inode *inode)
-{
- return (inode->i_sb->s_flags & MS_RDONLY)
- || IS_RDONLY(inode)
- /* || IS_APPEND(inode) */
- || IS_IMMUTABLE(inode);
-}
-
-#ifdef CONFIG_AUFS_BR_FUSE
-int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb);
-#else
-AuStubInt0(vfsub_test_mntns, struct vfsmount *mnt, struct super_block *h_sb);
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_update_h_iattr(struct path *h_path, int *did);
-struct file *vfsub_dentry_open(struct path *path, int flags);
-struct file *vfsub_filp_open(const char *path, int oflags, int mode);
-struct vfsub_aopen_args {
- struct file *file;
- unsigned int open_flag;
- umode_t create_mode;
- int *opened;
-};
-struct au_branch;
-int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
- struct vfsub_aopen_args *args, struct au_branch *br);
-int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
-
-struct dentry *vfsub_lookup_one_len_unlocked(const char *name,
- struct dentry *parent, int len);
-struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
- int len);
-
-struct vfsub_lkup_one_args {
- struct dentry **errp;
- struct qstr *name;
- struct dentry *parent;
-};
-
-static inline struct dentry *vfsub_lkup_one(struct qstr *name,
- struct dentry *parent)
-{
- return vfsub_lookup_one_len(name->name, parent, name->len);
-}
-
-void vfsub_call_lkup_one(void *args);
-
-/* ---------------------------------------------------------------------- */
-
-static inline int vfsub_mnt_want_write(struct vfsmount *mnt)
-{
- int err;
-
- lockdep_off();
- err = mnt_want_write(mnt);
- lockdep_on();
- return err;
-}
-
-static inline void vfsub_mnt_drop_write(struct vfsmount *mnt)
-{
- lockdep_off();
- mnt_drop_write(mnt);
- lockdep_on();
-}
-
-#if 0 /* reserved */
-static inline void vfsub_mnt_drop_write_file(struct file *file)
-{
- lockdep_off();
- mnt_drop_write_file(file);
- lockdep_on();
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-struct au_hinode;
-struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2);
-void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
- struct dentry *d2, struct au_hinode *hdir2);
-
-int vfsub_create(struct inode *dir, struct path *path, int mode,
- bool want_excl);
-int vfsub_symlink(struct inode *dir, struct path *path,
- const char *symname);
-int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
-int vfsub_link(struct dentry *src_dentry, struct inode *dir,
- struct path *path, struct inode **delegated_inode);
-int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
- struct inode *hdir, struct path *path,
- struct inode **delegated_inode);
-int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
-int vfsub_rmdir(struct inode *dir, struct path *path);
-
-/* ---------------------------------------------------------------------- */
-
-ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
- loff_t *ppos);
-ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
- loff_t *ppos);
-int vfsub_flush(struct file *file, fl_owner_t id);
-int vfsub_iterate_dir(struct file *file, struct dir_context *ctx);
-
-static inline loff_t vfsub_f_size_read(struct file *file)
-{
- return i_size_read(file_inode(file));
-}
-
-static inline unsigned int vfsub_file_flags(struct file *file)
-{
- unsigned int flags;
-
- spin_lock(&file->f_lock);
- flags = file->f_flags;
- spin_unlock(&file->f_lock);
-
- return flags;
-}
-
-static inline int vfsub_file_execed(struct file *file)
-{
- /* todo: direct access f_flags */
- return !!(vfsub_file_flags(file) & __FMODE_EXEC);
-}
-
-#if 0 /* reserved */
-static inline void vfsub_file_accessed(struct file *h_file)
-{
- file_accessed(h_file);
- vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
-}
-#endif
-
-#if 0 /* reserved */
-static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
- struct dentry *h_dentry)
-{
- struct path h_path = {
- .dentry = h_dentry,
- .mnt = h_mnt
- };
- touch_atime(&h_path);
- vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
-}
-#endif
-
-static inline int vfsub_update_time(struct inode *h_inode, struct timespec *ts,
- int flags)
-{
- return update_time(h_inode, ts, flags);
- /* no vfsub_update_h_iattr() since we don't have struct path */
-}
-
-#ifdef CONFIG_FS_POSIX_ACL
-static inline int vfsub_acl_chmod(struct inode *h_inode, umode_t h_mode)
-{
- int err;
-
- err = posix_acl_chmod(h_inode, h_mode);
- if (err == -EOPNOTSUPP)
- err = 0;
- return err;
-}
-#else
-AuStubInt0(vfsub_acl_chmod, struct inode *h_inode, umode_t h_mode);
-#endif
-
-long vfsub_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags);
-long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags);
-
-static inline long vfsub_truncate(struct path *path, loff_t length)
-{
- long err;
-
- lockdep_off();
- err = vfs_truncate(path, length);
- lockdep_on();
- return err;
-}
-
-int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
- struct file *h_file);
-int vfsub_fsync(struct file *file, struct path *path, int datasync);
-
-/* ---------------------------------------------------------------------- */
-
-static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
-{
- loff_t err;
-
- lockdep_off();
- err = vfs_llseek(file, offset, origin);
- lockdep_on();
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
-int vfsub_sio_rmdir(struct inode *dir, struct path *path);
-int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
- struct inode **delegated_inode);
-int vfsub_notify_change(struct path *path, struct iattr *ia,
- struct inode **delegated_inode);
-int vfsub_unlink(struct inode *dir, struct path *path,
- struct inode **delegated_inode, int force);
-
-/* ---------------------------------------------------------------------- */
-
-static inline int vfsub_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags)
-{
- int err;
-
- lockdep_off();
- err = vfs_setxattr(dentry, name, value, size, flags);
- lockdep_on();
-
- return err;
-}
-
-static inline int vfsub_removexattr(struct dentry *dentry, const char *name)
-{
- int err;
-
- lockdep_off();
- err = vfs_removexattr(dentry, name);
- lockdep_on();
-
- return err;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_VFSUB_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * policies for selecting one among multiple writable branches
- */
-
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/* subset of cpup_attr() */
-static noinline_for_stack
-int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
-{
- int err, sbits;
- struct iattr ia;
- struct inode *h_isrc;
-
- h_isrc = d_inode(h_src);
- ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
- ia.ia_mode = h_isrc->i_mode;
- ia.ia_uid = h_isrc->i_uid;
- ia.ia_gid = h_isrc->i_gid;
- sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
- au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags);
- /* no delegation since it is just created */
- err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL);
-
- /* is this nfs only? */
- if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) {
- ia.ia_valid = ATTR_FORCE | ATTR_MODE;
- ia.ia_mode = h_isrc->i_mode;
- err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL);
- }
-
- return err;
-}
-
-#define AuCpdown_PARENT_OPQ 1
-#define AuCpdown_WHED (1 << 1)
-#define AuCpdown_MADE_DIR (1 << 2)
-#define AuCpdown_DIROPQ (1 << 3)
-#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name)
-#define au_fset_cpdown(flags, name) \
- do { (flags) |= AuCpdown_##name; } while (0)
-#define au_fclr_cpdown(flags, name) \
- do { (flags) &= ~AuCpdown_##name; } while (0)
-
-static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
- unsigned int *flags)
-{
- int err;
- struct dentry *opq_dentry;
-
- opq_dentry = au_diropq_create(dentry, bdst);
- err = PTR_ERR(opq_dentry);
- if (IS_ERR(opq_dentry))
- goto out;
- dput(opq_dentry);
- au_fset_cpdown(*flags, DIROPQ);
-
-out:
- return err;
-}
-
-static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
- struct inode *dir, aufs_bindex_t bdst)
-{
- int err;
- struct path h_path;
- struct au_branch *br;
-
- br = au_sbr(dentry->d_sb, bdst);
- h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- err = 0;
- if (d_is_positive(h_path.dentry)) {
- h_path.mnt = au_br_mnt(br);
- err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
- dentry);
- }
- dput(h_path.dentry);
-
-out:
- return err;
-}
-
-static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
- struct au_pin *pin,
- struct dentry *h_parent, void *arg)
-{
- int err, rerr;
- aufs_bindex_t bopq, btop;
- struct path h_path;
- struct dentry *parent;
- struct inode *h_dir, *h_inode, *inode, *dir;
- unsigned int *flags = arg;
-
- btop = au_dbtop(dentry);
- /* dentry is di-locked */
- parent = dget_parent(dentry);
- dir = d_inode(parent);
- h_dir = d_inode(h_parent);
- AuDebugOn(h_dir != au_h_iptr(dir, bdst));
- IMustLock(h_dir);
-
- err = au_lkup_neg(dentry, bdst, /*wh*/0);
- if (unlikely(err < 0))
- goto out;
- h_path.dentry = au_h_dptr(dentry, bdst);
- h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
- err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
- S_IRWXU | S_IRUGO | S_IXUGO);
- if (unlikely(err))
- goto out_put;
- au_fset_cpdown(*flags, MADE_DIR);
-
- bopq = au_dbdiropq(dentry);
- au_fclr_cpdown(*flags, WHED);
- au_fclr_cpdown(*flags, DIROPQ);
- if (au_dbwh(dentry) == bdst)
- au_fset_cpdown(*flags, WHED);
- if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst)
- au_fset_cpdown(*flags, PARENT_OPQ);
- h_inode = d_inode(h_path.dentry);
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- if (au_ftest_cpdown(*flags, WHED)) {
- err = au_cpdown_dir_opq(dentry, bdst, flags);
- if (unlikely(err)) {
- inode_unlock(h_inode);
- goto out_dir;
- }
- }
-
- err = au_cpdown_attr(&h_path, au_h_dptr(dentry, btop));
- inode_unlock(h_inode);
- if (unlikely(err))
- goto out_opq;
-
- if (au_ftest_cpdown(*flags, WHED)) {
- err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
- if (unlikely(err))
- goto out_opq;
- }
-
- inode = d_inode(dentry);
- if (au_ibbot(inode) < bdst)
- au_set_ibbot(inode, bdst);
- au_set_h_iptr(inode, bdst, au_igrab(h_inode),
- au_hi_flags(inode, /*isdir*/1));
- au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0);
- goto out; /* success */
-
- /* revert */
-out_opq:
- if (au_ftest_cpdown(*flags, DIROPQ)) {
- inode_lock_nested(h_inode, AuLsc_I_CHILD);
- rerr = au_diropq_remove(dentry, bdst);
- inode_unlock(h_inode);
- if (unlikely(rerr)) {
- AuIOErr("failed removing diropq for %pd b%d (%d)\n",
- dentry, bdst, rerr);
- err = -EIO;
- goto out;
- }
- }
-out_dir:
- if (au_ftest_cpdown(*flags, MADE_DIR)) {
- rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
- if (unlikely(rerr)) {
- AuIOErr("failed removing %pd b%d (%d)\n",
- dentry, bdst, rerr);
- err = -EIO;
- }
- }
-out_put:
- au_set_h_dptr(dentry, bdst, NULL);
- if (au_dbbot(dentry) == bdst)
- au_update_dbbot(dentry);
-out:
- dput(parent);
- return err;
-}
-
-int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-{
- int err;
- unsigned int flags;
-
- flags = 0;
- err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* policies for create */
-
-int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex)
-{
- int err, i, j, ndentry;
- aufs_bindex_t bopq;
- struct au_dcsub_pages dpages;
- struct au_dpage *dpage;
- struct dentry **dentries, *parent, *d;
-
- err = au_dpages_init(&dpages, GFP_NOFS);
- if (unlikely(err))
- goto out;
- parent = dget_parent(dentry);
- err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0);
- if (unlikely(err))
- goto out_free;
-
- err = bindex;
- for (i = 0; i < dpages.ndpage; i++) {
- dpage = dpages.dpages + i;
- dentries = dpage->dentries;
- ndentry = dpage->ndentry;
- for (j = 0; j < ndentry; j++) {
- d = dentries[j];
- di_read_lock_parent2(d, !AuLock_IR);
- bopq = au_dbdiropq(d);
- di_read_unlock(d, !AuLock_IR);
- if (bopq >= 0 && bopq < err)
- err = bopq;
- }
- }
-
-out_free:
- dput(parent);
- au_dpages_free(&dpages);
-out:
- return err;
-}
-
-static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
-{
- for (; bindex >= 0; bindex--)
- if (!au_br_rdonly(au_sbr(sb, bindex)))
- return bindex;
- return -EROFS;
-}
-
-/* top down parent */
-static int au_wbr_create_tdp(struct dentry *dentry,
- unsigned int flags __maybe_unused)
-{
- int err;
- aufs_bindex_t btop, bindex;
- struct super_block *sb;
- struct dentry *parent, *h_parent;
-
- sb = dentry->d_sb;
- btop = au_dbtop(dentry);
- err = btop;
- if (!au_br_rdonly(au_sbr(sb, btop)))
- goto out;
-
- err = -EROFS;
- parent = dget_parent(dentry);
- for (bindex = au_dbtop(parent); bindex < btop; bindex++) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || d_is_negative(h_parent))
- continue;
-
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = bindex;
- break;
- }
- }
- dput(parent);
-
- /* bottom up here */
- if (unlikely(err < 0)) {
- err = au_wbr_bu(sb, btop - 1);
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
- }
-
-out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* an exception for the policy other than tdp */
-static int au_wbr_create_exp(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bwh, bdiropq;
- struct dentry *parent;
-
- err = -1;
- bwh = au_dbwh(dentry);
- parent = dget_parent(dentry);
- bdiropq = au_dbdiropq(parent);
- if (bwh >= 0) {
- if (bdiropq >= 0)
- err = min(bdiropq, bwh);
- else
- err = bwh;
- AuDbg("%d\n", err);
- } else if (bdiropq >= 0) {
- err = bdiropq;
- AuDbg("%d\n", err);
- }
- dput(parent);
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
- if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
- err = -1;
-
- AuDbg("%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* round robin */
-static int au_wbr_create_init_rr(struct super_block *sb)
-{
- int err;
-
- err = au_wbr_bu(sb, au_sbbot(sb));
- atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
- /* smp_mb(); */
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags)
-{
- int err, nbr;
- unsigned int u;
- aufs_bindex_t bindex, bbot;
- struct super_block *sb;
- atomic_t *next;
-
- err = au_wbr_create_exp(dentry);
- if (err >= 0)
- goto out;
-
- sb = dentry->d_sb;
- next = &au_sbi(sb)->si_wbr_rr_next;
- bbot = au_sbbot(sb);
- nbr = bbot + 1;
- for (bindex = 0; bindex <= bbot; bindex++) {
- if (!au_ftest_wbr(flags, DIR)) {
- err = atomic_dec_return(next) + 1;
- /* modulo for 0 is meaningless */
- if (unlikely(!err))
- err = atomic_dec_return(next) + 1;
- } else
- err = atomic_read(next);
- AuDbg("%d\n", err);
- u = err;
- err = u % nbr;
- AuDbg("%d\n", err);
- if (!au_br_rdonly(au_sbr(sb, err)))
- break;
- err = -EROFS;
- }
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
-out:
- AuDbg("%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* most free space */
-static void au_mfs(struct dentry *dentry, struct dentry *parent)
-{
- struct super_block *sb;
- struct au_branch *br;
- struct au_wbr_mfs *mfs;
- struct dentry *h_parent;
- aufs_bindex_t bindex, bbot;
- int err;
- unsigned long long b, bavail;
- struct path h_path;
- /* reduce the stack usage */
- struct kstatfs *st;
-
- st = kmalloc(sizeof(*st), GFP_NOFS);
- if (unlikely(!st)) {
- AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
- return;
- }
-
- bavail = 0;
- sb = dentry->d_sb;
- mfs = &au_sbi(sb)->si_wbr_mfs;
- MtxMustLock(&mfs->mfs_lock);
- mfs->mfs_bindex = -EROFS;
- mfs->mfsrr_bytes = 0;
- if (!parent) {
- bindex = 0;
- bbot = au_sbbot(sb);
- } else {
- bindex = au_dbtop(parent);
- bbot = au_dbtaildir(parent);
- }
-
- for (; bindex <= bbot; bindex++) {
- if (parent) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || d_is_negative(h_parent))
- continue;
- }
- br = au_sbr(sb, bindex);
- if (au_br_rdonly(br))
- continue;
-
- /* sb->s_root for NFS is unreliable */
- h_path.mnt = au_br_mnt(br);
- h_path.dentry = h_path.mnt->mnt_root;
- err = vfs_statfs(&h_path, st);
- if (unlikely(err)) {
- AuWarn1("failed statfs, b%d, %d\n", bindex, err);
- continue;
- }
-
- /* when the available size is equal, select the lower one */
- BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
- || sizeof(b) < sizeof(st->f_bsize));
- b = st->f_bavail * st->f_bsize;
- br->br_wbr->wbr_bytes = b;
- if (b >= bavail) {
- bavail = b;
- mfs->mfs_bindex = bindex;
- mfs->mfs_jiffy = jiffies;
- }
- }
-
- mfs->mfsrr_bytes = bavail;
- AuDbg("b%d\n", mfs->mfs_bindex);
- au_delayed_kfree(st);
-}
-
-static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags)
-{
- int err;
- struct dentry *parent;
- struct super_block *sb;
- struct au_wbr_mfs *mfs;
-
- err = au_wbr_create_exp(dentry);
- if (err >= 0)
- goto out;
-
- sb = dentry->d_sb;
- parent = NULL;
- if (au_ftest_wbr(flags, PARENT))
- parent = dget_parent(dentry);
- mfs = &au_sbi(sb)->si_wbr_mfs;
- mutex_lock(&mfs->mfs_lock);
- if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
- || mfs->mfs_bindex < 0
- || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
- au_mfs(dentry, parent);
- mutex_unlock(&mfs->mfs_lock);
- err = mfs->mfs_bindex;
- dput(parent);
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
-out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_init_mfs(struct super_block *sb)
-{
- struct au_wbr_mfs *mfs;
-
- mfs = &au_sbi(sb)->si_wbr_mfs;
- mutex_init(&mfs->mfs_lock);
- mfs->mfs_jiffy = 0;
- mfs->mfs_bindex = -EROFS;
-
- return 0;
-}
-
-static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
-{
- mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
- return 0;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* most free space and then round robin */
-static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags)
-{
- int err;
- struct au_wbr_mfs *mfs;
-
- err = au_wbr_create_mfs(dentry, flags);
- if (err >= 0) {
- mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
- mutex_lock(&mfs->mfs_lock);
- if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
- err = au_wbr_create_rr(dentry, flags);
- mutex_unlock(&mfs->mfs_lock);
- }
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_create_init_mfsrr(struct super_block *sb)
-{
- int err;
-
- au_wbr_create_init_mfs(sb); /* ignore */
- err = au_wbr_create_init_rr(sb);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* top down parent and most free space */
-static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags)
-{
- int err, e2;
- unsigned long long b;
- aufs_bindex_t bindex, btop, bbot;
- struct super_block *sb;
- struct dentry *parent, *h_parent;
- struct au_branch *br;
-
- err = au_wbr_create_tdp(dentry, flags);
- if (unlikely(err < 0))
- goto out;
- parent = dget_parent(dentry);
- btop = au_dbtop(parent);
- bbot = au_dbtaildir(parent);
- if (btop == bbot)
- goto out_parent; /* success */
-
- e2 = au_wbr_create_mfs(dentry, flags);
- if (e2 < 0)
- goto out_parent; /* success */
-
- /* when the available size is equal, select upper one */
- sb = dentry->d_sb;
- br = au_sbr(sb, err);
- b = br->br_wbr->wbr_bytes;
- AuDbg("b%d, %llu\n", err, b);
-
- for (bindex = btop; bindex <= bbot; bindex++) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || d_is_negative(h_parent))
- continue;
-
- br = au_sbr(sb, bindex);
- if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
- b = br->br_wbr->wbr_bytes;
- err = bindex;
- AuDbg("b%d, %llu\n", err, b);
- }
- }
-
- if (err >= 0)
- err = au_wbr_nonopq(dentry, err);
-
-out_parent:
- dput(parent);
-out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * - top down parent
- * - most free space with parent
- * - most free space round-robin regardless parent
- */
-static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags)
-{
- int err;
- unsigned long long watermark;
- struct super_block *sb;
- struct au_branch *br;
- struct au_wbr_mfs *mfs;
-
- err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT);
- if (unlikely(err < 0))
- goto out;
-
- sb = dentry->d_sb;
- br = au_sbr(sb, err);
- mfs = &au_sbi(sb)->si_wbr_mfs;
- mutex_lock(&mfs->mfs_lock);
- watermark = mfs->mfsrr_watermark;
- mutex_unlock(&mfs->mfs_lock);
- if (br->br_wbr->wbr_bytes < watermark)
- /* regardless the parent dir */
- err = au_wbr_create_mfsrr(dentry, flags);
-
-out:
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* policies for copyup */
-
-/* top down parent */
-static int au_wbr_copyup_tdp(struct dentry *dentry)
-{
- return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0);
-}
-
-/* bottom up parent */
-static int au_wbr_copyup_bup(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bindex, btop;
- struct dentry *parent, *h_parent;
- struct super_block *sb;
-
- err = -EROFS;
- sb = dentry->d_sb;
- parent = dget_parent(dentry);
- btop = au_dbtop(parent);
- for (bindex = au_dbtop(dentry); bindex >= btop; bindex--) {
- h_parent = au_h_dptr(parent, bindex);
- if (!h_parent || d_is_negative(h_parent))
- continue;
-
- if (!au_br_rdonly(au_sbr(sb, bindex))) {
- err = bindex;
- break;
- }
- }
- dput(parent);
-
- /* bottom up here */
- if (unlikely(err < 0))
- err = au_wbr_bu(sb, btop - 1);
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-/* bottom up */
-int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop)
-{
- int err;
-
- err = au_wbr_bu(dentry->d_sb, btop);
- AuDbg("b%d\n", err);
- if (err > btop)
- err = au_wbr_nonopq(dentry, err);
-
- AuDbg("b%d\n", err);
- return err;
-}
-
-static int au_wbr_copyup_bu(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t btop;
-
- btop = au_dbtop(dentry);
- err = au_wbr_do_copyup_bu(dentry, btop);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
- [AuWbrCopyup_TDP] = {
- .copyup = au_wbr_copyup_tdp
- },
- [AuWbrCopyup_BUP] = {
- .copyup = au_wbr_copyup_bup
- },
- [AuWbrCopyup_BU] = {
- .copyup = au_wbr_copyup_bu
- }
-};
-
-struct au_wbr_create_operations au_wbr_create_ops[] = {
- [AuWbrCreate_TDP] = {
- .create = au_wbr_create_tdp
- },
- [AuWbrCreate_RR] = {
- .create = au_wbr_create_rr,
- .init = au_wbr_create_init_rr
- },
- [AuWbrCreate_MFS] = {
- .create = au_wbr_create_mfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSV] = {
- .create = au_wbr_create_mfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSRR] = {
- .create = au_wbr_create_mfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_MFSRRV] = {
- .create = au_wbr_create_mfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFS] = {
- .create = au_wbr_create_pmfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFSV] = {
- .create = au_wbr_create_pmfs,
- .init = au_wbr_create_init_mfs,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFSRR] = {
- .create = au_wbr_create_pmfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- },
- [AuWbrCreate_PMFSRRV] = {
- .create = au_wbr_create_pmfsrr,
- .init = au_wbr_create_init_mfsrr,
- .fin = au_wbr_create_fin_mfs
- }
-};
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * whiteout for logical deletion and opaque directory
- */
-
-#include "aufs.h"
-
-#define WH_MASK S_IRUGO
-
-/*
- * If a directory contains this file, then it is opaque. We start with the
- * .wh. flag so that it is blocked by lookup.
- */
-static struct qstr diropq_name = QSTR_INIT(AUFS_WH_DIROPQ,
- sizeof(AUFS_WH_DIROPQ) - 1);
-
-/*
- * generate whiteout name, which is NOT terminated by NULL.
- * @name: original d_name.name
- * @len: original d_name.len
- * @wh: whiteout qstr
- * returns zero when succeeds, otherwise error.
- * succeeded value as wh->name should be freed by kfree().
- */
-int au_wh_name_alloc(struct qstr *wh, const struct qstr *name)
-{
- char *p;
-
- if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN))
- return -ENAMETOOLONG;
-
- wh->len = name->len + AUFS_WH_PFX_LEN;
- p = kmalloc(wh->len, GFP_NOFS);
- wh->name = p;
- if (p) {
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len);
- /* smp_mb(); */
- return 0;
- }
- return -ENOMEM;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * test if the @wh_name exists under @h_parent.
- * @try_sio specifies the necessary of super-io.
- */
-int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio)
-{
- int err;
- struct dentry *wh_dentry;
-
- if (!try_sio)
- wh_dentry = vfsub_lkup_one(wh_name, h_parent);
- else
- wh_dentry = au_sio_lkup_one(wh_name, h_parent);
- err = PTR_ERR(wh_dentry);
- if (IS_ERR(wh_dentry)) {
- if (err == -ENAMETOOLONG)
- err = 0;
- goto out;
- }
-
- err = 0;
- if (d_is_negative(wh_dentry))
- goto out_wh; /* success */
-
- err = 1;
- if (d_is_reg(wh_dentry))
- goto out_wh; /* success */
-
- err = -EIO;
- AuIOErr("%pd Invalid whiteout entry type 0%o.\n",
- wh_dentry, d_inode(wh_dentry)->i_mode);
-
-out_wh:
- dput(wh_dentry);
-out:
- return err;
-}
-
-/*
- * test if the @h_dentry sets opaque or not.
- */
-int au_diropq_test(struct dentry *h_dentry)
-{
- int err;
- struct inode *h_dir;
-
- h_dir = d_inode(h_dentry);
- err = au_wh_test(h_dentry, &diropq_name,
- au_test_h_perm_sio(h_dir, MAY_EXEC));
- return err;
-}
-
-/*
- * returns a negative dentry whose name is unique and temporary.
- */
-struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
- struct qstr *prefix)
-{
- struct dentry *dentry;
- int i;
- char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1],
- *name, *p;
- /* strict atomic_t is unnecessary here */
- static unsigned short cnt;
- struct qstr qs;
-
- BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
-
- name = defname;
- qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1;
- if (unlikely(prefix->len > DNAME_INLINE_LEN)) {
- dentry = ERR_PTR(-ENAMETOOLONG);
- if (unlikely(qs.len > NAME_MAX))
- goto out;
- dentry = ERR_PTR(-ENOMEM);
- name = kmalloc(qs.len + 1, GFP_NOFS);
- if (unlikely(!name))
- goto out;
- }
-
- /* doubly whiteout-ed */
- memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
- p = name + AUFS_WH_PFX_LEN * 2;
- memcpy(p, prefix->name, prefix->len);
- p += prefix->len;
- *p++ = '.';
- AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
-
- qs.name = name;
- for (i = 0; i < 3; i++) {
- sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++);
- dentry = au_sio_lkup_one(&qs, h_parent);
- if (IS_ERR(dentry) || d_is_negative(dentry))
- goto out_name;
- dput(dentry);
- }
- /* pr_warn("could not get random name\n"); */
- dentry = ERR_PTR(-EEXIST);
- AuDbg("%.*s\n", AuLNPair(&qs));
- BUG();
-
-out_name:
- if (name != defname)
- au_delayed_kfree(name);
-out:
- AuTraceErrPtr(dentry);
- return dentry;
-}
-
-/*
- * rename the @h_dentry on @br to the whiteouted temporary name.
- */
-int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = au_br_mnt(br)
- };
- struct inode *h_dir, *delegated;
- struct dentry *h_parent;
-
- h_parent = h_dentry->d_parent; /* dir inode is locked */
- h_dir = d_inode(h_parent);
- IMustLock(h_dir);
-
- h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name);
- err = PTR_ERR(h_path.dentry);
- if (IS_ERR(h_path.dentry))
- goto out;
-
- /* under the same dir, no need to lock_rename() */
- delegated = NULL;
- err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path, &delegated);
- AuTraceErr(err);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal rename\n");
- iput(delegated);
- }
- dput(h_path.dentry);
-
-out:
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * functions for removing a whiteout
- */
-
-static int do_unlink_wh(struct inode *h_dir, struct path *h_path)
-{
- int err, force;
- struct inode *delegated;
-
- /*
- * forces superio when the dir has a sticky bit.
- * this may be a violation of unix fs semantics.
- */
- force = (h_dir->i_mode & S_ISVTX)
- && !uid_eq(current_fsuid(), d_inode(h_path->dentry)->i_uid);
- delegated = NULL;
- err = vfsub_unlink(h_dir, h_path, &delegated, force);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- return err;
-}
-
-int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
- struct dentry *dentry)
-{
- int err;
-
- err = do_unlink_wh(h_dir, h_path);
- if (!err && dentry)
- au_set_dbwh(dentry, -1);
-
- return err;
-}
-
-static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh,
- struct au_branch *br)
-{
- int err;
- struct path h_path = {
- .mnt = au_br_mnt(br)
- };
-
- err = 0;
- h_path.dentry = vfsub_lkup_one(wh, h_parent);
- if (IS_ERR(h_path.dentry))
- err = PTR_ERR(h_path.dentry);
- else {
- if (d_is_reg(h_path.dentry))
- err = do_unlink_wh(d_inode(h_parent), &h_path);
- dput(h_path.dentry);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * initialize/clean whiteout for a branch
- */
-
-static void au_wh_clean(struct inode *h_dir, struct path *whpath,
- const int isdir)
-{
- int err;
- struct inode *delegated;
-
- if (d_is_negative(whpath->dentry))
- return;
-
- if (isdir)
- err = vfsub_rmdir(h_dir, whpath);
- else {
- delegated = NULL;
- err = vfsub_unlink(h_dir, whpath, &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- }
- if (unlikely(err))
- pr_warn("failed removing %pd (%d), ignored.\n",
- whpath->dentry, err);
-}
-
-static int test_linkable(struct dentry *h_root)
-{
- struct inode *h_dir = d_inode(h_root);
-
- if (h_dir->i_op->link)
- return 0;
-
- pr_err("%pd (%s) doesn't support link(2), use noplink and rw+nolwh\n",
- h_root, au_sbtype(h_root->d_sb));
- return -ENOSYS;
-}
-
-/* todo: should this mkdir be done in /sbin/mount.aufs helper? */
-static int au_whdir(struct inode *h_dir, struct path *path)
-{
- int err;
-
- err = -EEXIST;
- if (d_is_negative(path->dentry)) {
- int mode = S_IRWXU;
-
- if (au_test_nfs(path->dentry->d_sb))
- mode |= S_IXUGO;
- err = vfsub_mkdir(h_dir, path, mode);
- } else if (d_is_dir(path->dentry))
- err = 0;
- else
- pr_err("unknown %pd exists\n", path->dentry);
-
- return err;
-}
-
-struct au_wh_base {
- const struct qstr *name;
- struct dentry *dentry;
-};
-
-static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[],
- struct path *h_path)
-{
- h_path->dentry = base[AuBrWh_BASE].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/0);
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/1);
-}
-
-/*
- * returns tri-state,
- * minus: error, caller should print the message
- * zero: succuess
- * plus: error, caller should NOT print the message
- */
-static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr,
- int do_plink, struct au_wh_base base[],
- struct path *h_path)
-{
- int err;
- struct inode *h_dir;
-
- h_dir = d_inode(h_root);
- h_path->dentry = base[AuBrWh_BASE].dentry;
- au_wh_clean(h_dir, h_path, /*isdir*/0);
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- if (do_plink) {
- err = test_linkable(h_root);
- if (unlikely(err)) {
- err = 1;
- goto out;
- }
-
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
- } else
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-
-out:
- return err;
-}
-
-/*
- * for the moment, aufs supports the branch filesystem which does not support
- * link(2). testing on FAT which does not support i_op->setattr() fully either,
- * copyup failed. finally, such filesystem will not be used as the writable
- * branch.
- *
- * returns tri-state, see above.
- */
-static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr,
- int do_plink, struct au_wh_base base[],
- struct path *h_path)
-{
- int err;
- struct inode *h_dir;
-
- WbrWhMustWriteLock(wbr);
-
- err = test_linkable(h_root);
- if (unlikely(err)) {
- err = 1;
- goto out;
- }
-
- /*
- * todo: should this create be done in /sbin/mount.aufs helper?
- */
- err = -EEXIST;
- h_dir = d_inode(h_root);
- if (d_is_negative(base[AuBrWh_BASE].dentry)) {
- h_path->dentry = base[AuBrWh_BASE].dentry;
- err = vfsub_create(h_dir, h_path, WH_MASK, /*want_excl*/true);
- } else if (d_is_reg(base[AuBrWh_BASE].dentry))
- err = 0;
- else
- pr_err("unknown %pd2 exists\n", base[AuBrWh_BASE].dentry);
- if (unlikely(err))
- goto out;
-
- h_path->dentry = base[AuBrWh_PLINK].dentry;
- if (do_plink) {
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
- } else
- au_wh_clean(h_dir, h_path, /*isdir*/1);
- wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry);
-
- h_path->dentry = base[AuBrWh_ORPH].dentry;
- err = au_whdir(h_dir, h_path);
- if (unlikely(err))
- goto out;
- wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-
-out:
- return err;
-}
-
-/*
- * initialize the whiteout base file/dir for @br.
- */
-int au_wh_init(struct au_branch *br, struct super_block *sb)
-{
- int err, i;
- const unsigned char do_plink
- = !!au_opt_test(au_mntflags(sb), PLINK);
- struct inode *h_dir;
- struct path path = br->br_path;
- struct dentry *h_root = path.dentry;
- struct au_wbr *wbr = br->br_wbr;
- static const struct qstr base_name[] = {
- [AuBrWh_BASE] = QSTR_INIT(AUFS_BASE_NAME,
- sizeof(AUFS_BASE_NAME) - 1),
- [AuBrWh_PLINK] = QSTR_INIT(AUFS_PLINKDIR_NAME,
- sizeof(AUFS_PLINKDIR_NAME) - 1),
- [AuBrWh_ORPH] = QSTR_INIT(AUFS_ORPHDIR_NAME,
- sizeof(AUFS_ORPHDIR_NAME) - 1)
- };
- struct au_wh_base base[] = {
- [AuBrWh_BASE] = {
- .name = base_name + AuBrWh_BASE,
- .dentry = NULL
- },
- [AuBrWh_PLINK] = {
- .name = base_name + AuBrWh_PLINK,
- .dentry = NULL
- },
- [AuBrWh_ORPH] = {
- .name = base_name + AuBrWh_ORPH,
- .dentry = NULL
- }
- };
-
- if (wbr)
- WbrWhMustWriteLock(wbr);
-
- for (i = 0; i < AuBrWh_Last; i++) {
- /* doubly whiteouted */
- struct dentry *d;
-
- d = au_wh_lkup(h_root, (void *)base[i].name, br);
- err = PTR_ERR(d);
- if (IS_ERR(d))
- goto out;
-
- base[i].dentry = d;
- AuDebugOn(wbr
- && wbr->wbr_wh[i]
- && wbr->wbr_wh[i] != base[i].dentry);
- }
-
- if (wbr)
- for (i = 0; i < AuBrWh_Last; i++) {
- dput(wbr->wbr_wh[i]);
- wbr->wbr_wh[i] = NULL;
- }
-
- err = 0;
- if (!au_br_writable(br->br_perm)) {
- h_dir = d_inode(h_root);
- au_wh_init_ro(h_dir, base, &path);
- } else if (!au_br_wh_linkable(br->br_perm)) {
- err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path);
- if (err > 0)
- goto out;
- else if (err)
- goto out_err;
- } else {
- err = au_wh_init_rw(h_root, wbr, do_plink, base, &path);
- if (err > 0)
- goto out;
- else if (err)
- goto out_err;
- }
- goto out; /* success */
-
-out_err:
- pr_err("an error(%d) on the writable branch %pd(%s)\n",
- err, h_root, au_sbtype(h_root->d_sb));
-out:
- for (i = 0; i < AuBrWh_Last; i++)
- dput(base[i].dentry);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-/*
- * whiteouts are all hard-linked usually.
- * when its link count reaches a ceiling, we create a new whiteout base
- * asynchronously.
- */
-
-struct reinit_br_wh {
- struct super_block *sb;
- struct au_branch *br;
-};
-
-static void reinit_br_wh(void *arg)
-{
- int err;
- aufs_bindex_t bindex;
- struct path h_path;
- struct reinit_br_wh *a = arg;
- struct au_wbr *wbr;
- struct inode *dir, *delegated;
- struct dentry *h_root;
- struct au_hinode *hdir;
-
- err = 0;
- wbr = a->br->br_wbr;
- /* big aufs lock */
- si_noflush_write_lock(a->sb);
- if (!au_br_writable(a->br->br_perm))
- goto out;
- bindex = au_br_index(a->sb, a->br->br_id);
- if (unlikely(bindex < 0))
- goto out;
-
- di_read_lock_parent(a->sb->s_root, AuLock_IR);
- dir = d_inode(a->sb->s_root);
- hdir = au_hi(dir, bindex);
- h_root = au_h_dptr(a->sb->s_root, bindex);
- AuDebugOn(h_root != au_br_dentry(a->br));
-
- au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
- wbr_wh_write_lock(wbr);
- err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode,
- h_root, a->br);
- if (!err) {
- h_path.dentry = wbr->wbr_whbase;
- h_path.mnt = au_br_mnt(a->br);
- delegated = NULL;
- err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated,
- /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- } else {
- pr_warn("%pd is moved, ignored\n", wbr->wbr_whbase);
- err = 0;
- }
- dput(wbr->wbr_whbase);
- wbr->wbr_whbase = NULL;
- if (!err)
- err = au_wh_init(a->br, a->sb);
- wbr_wh_write_unlock(wbr);
- au_hn_inode_unlock(hdir);
- di_read_unlock(a->sb->s_root, AuLock_IR);
- if (!err)
- au_fhsm_wrote(a->sb, bindex, /*force*/0);
-
-out:
- if (wbr)
- atomic_dec(&wbr->wbr_wh_running);
- au_br_put(a->br);
- si_write_unlock(a->sb);
- au_nwt_done(&au_sbi(a->sb)->si_nowait);
- au_delayed_kfree(arg);
- if (unlikely(err))
- AuIOErr("err %d\n", err);
-}
-
-static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br)
-{
- int do_dec, wkq_err;
- struct reinit_br_wh *arg;
-
- do_dec = 1;
- if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1)
- goto out;
-
- /* ignore ENOMEM */
- arg = kmalloc(sizeof(*arg), GFP_NOFS);
- if (arg) {
- /*
- * dec(wh_running), kfree(arg) and dec(br_count)
- * in reinit function
- */
- arg->sb = sb;
- arg->br = br;
- au_br_get(br);
- wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0);
- if (unlikely(wkq_err)) {
- atomic_dec(&br->br_wbr->wbr_wh_running);
- au_br_put(br);
- au_delayed_kfree(arg);
- }
- do_dec = 0;
- }
-
-out:
- if (do_dec)
- atomic_dec(&br->br_wbr->wbr_wh_running);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create the whiteout @wh.
- */
-static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex,
- struct dentry *wh)
-{
- int err;
- struct path h_path = {
- .dentry = wh
- };
- struct au_branch *br;
- struct au_wbr *wbr;
- struct dentry *h_parent;
- struct inode *h_dir, *delegated;
-
- h_parent = wh->d_parent; /* dir inode is locked */
- h_dir = d_inode(h_parent);
- IMustLock(h_dir);
-
- br = au_sbr(sb, bindex);
- h_path.mnt = au_br_mnt(br);
- wbr = br->br_wbr;
- wbr_wh_read_lock(wbr);
- if (wbr->wbr_whbase) {
- delegated = NULL;
- err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path, &delegated);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal link\n");
- iput(delegated);
- }
- if (!err || err != -EMLINK)
- goto out;
-
- /* link count full. re-initialize br_whbase. */
- kick_reinit_br_wh(sb, br);
- }
-
- /* return this error in this context */
- err = vfsub_create(h_dir, &h_path, WH_MASK, /*want_excl*/true);
- if (!err)
- au_fhsm_wrote(sb, bindex, /*force*/0);
-
-out:
- wbr_wh_read_unlock(wbr);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create or remove the diropq.
- */
-static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags)
-{
- struct dentry *opq_dentry, *h_dentry;
- struct super_block *sb;
- struct au_branch *br;
- int err;
-
- sb = dentry->d_sb;
- br = au_sbr(sb, bindex);
- h_dentry = au_h_dptr(dentry, bindex);
- opq_dentry = vfsub_lkup_one(&diropq_name, h_dentry);
- if (IS_ERR(opq_dentry))
- goto out;
-
- if (au_ftest_diropq(flags, CREATE)) {
- err = link_or_create_wh(sb, bindex, opq_dentry);
- if (!err) {
- au_set_dbdiropq(dentry, bindex);
- goto out; /* success */
- }
- } else {
- struct path tmp = {
- .dentry = opq_dentry,
- .mnt = au_br_mnt(br)
- };
- err = do_unlink_wh(au_h_iptr(d_inode(dentry), bindex), &tmp);
- if (!err)
- au_set_dbdiropq(dentry, -1);
- }
- dput(opq_dentry);
- opq_dentry = ERR_PTR(err);
-
-out:
- return opq_dentry;
-}
-
-struct do_diropq_args {
- struct dentry **errp;
- struct dentry *dentry;
- aufs_bindex_t bindex;
- unsigned int flags;
-};
-
-static void call_do_diropq(void *args)
-{
- struct do_diropq_args *a = args;
- *a->errp = do_diropq(a->dentry, a->bindex, a->flags);
-}
-
-struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags)
-{
- struct dentry *diropq, *h_dentry;
-
- h_dentry = au_h_dptr(dentry, bindex);
- if (!au_test_h_perm_sio(d_inode(h_dentry), MAY_EXEC | MAY_WRITE))
- diropq = do_diropq(dentry, bindex, flags);
- else {
- int wkq_err;
- struct do_diropq_args args = {
- .errp = &diropq,
- .dentry = dentry,
- .bindex = bindex,
- .flags = flags
- };
-
- wkq_err = au_wkq_wait(call_do_diropq, &args);
- if (unlikely(wkq_err))
- diropq = ERR_PTR(wkq_err);
- }
-
- return diropq;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * lookup whiteout dentry.
- * @h_parent: lower parent dentry which must exist and be locked
- * @base_name: name of dentry which will be whiteouted
- * returns dentry for whiteout.
- */
-struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
- struct au_branch *br)
-{
- int err;
- struct qstr wh_name;
- struct dentry *wh_dentry;
-
- err = au_wh_name_alloc(&wh_name, base_name);
- wh_dentry = ERR_PTR(err);
- if (!err) {
- wh_dentry = vfsub_lkup_one(&wh_name, h_parent);
- au_delayed_kfree(wh_name.name);
- }
- return wh_dentry;
-}
-
-/*
- * link/create a whiteout for @dentry on @bindex.
- */
-struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent)
-{
- struct dentry *wh_dentry;
- struct super_block *sb;
- int err;
-
- sb = dentry->d_sb;
- wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex));
- if (!IS_ERR(wh_dentry) && d_is_negative(wh_dentry)) {
- err = link_or_create_wh(sb, bindex, wh_dentry);
- if (!err) {
- au_set_dbwh(dentry, bindex);
- au_fhsm_wrote(sb, bindex, /*force*/0);
- } else {
- dput(wh_dentry);
- wh_dentry = ERR_PTR(err);
- }
- }
-
- return wh_dentry;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* Delete all whiteouts in this directory on branch bindex. */
-static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist,
- aufs_bindex_t bindex, struct au_branch *br)
-{
- int err;
- unsigned long ul, n;
- struct qstr wh_name;
- char *p;
- struct hlist_head *head;
- struct au_vdir_wh *pos;
- struct au_vdir_destr *str;
-
- err = -ENOMEM;
- p = (void *)__get_free_page(GFP_NOFS);
- wh_name.name = p;
- if (unlikely(!wh_name.name))
- goto out;
-
- err = 0;
- memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
- p += AUFS_WH_PFX_LEN;
- n = whlist->nh_num;
- head = whlist->nh_head;
- for (ul = 0; !err && ul < n; ul++, head++) {
- hlist_for_each_entry(pos, head, wh_hash) {
- if (pos->wh_bindex != bindex)
- continue;
-
- str = &pos->wh_str;
- if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
- memcpy(p, str->name, str->len);
- wh_name.len = AUFS_WH_PFX_LEN + str->len;
- err = unlink_wh_name(h_dentry, &wh_name, br);
- if (!err)
- continue;
- break;
- }
- AuIOErr("whiteout name too long %.*s\n",
- str->len, str->name);
- err = -EIO;
- break;
- }
- }
- au_delayed_free_page((unsigned long)wh_name.name);
-
-out:
- return err;
-}
-
-struct del_wh_children_args {
- int *errp;
- struct dentry *h_dentry;
- struct au_nhash *whlist;
- aufs_bindex_t bindex;
- struct au_branch *br;
-};
-
-static void call_del_wh_children(void *args)
-{
- struct del_wh_children_args *a = args;
- *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp)
-{
- struct au_whtmp_rmdir *whtmp;
- int err;
- unsigned int rdhash;
-
- SiMustAnyLock(sb);
-
- whtmp = kzalloc(sizeof(*whtmp), gfp);
- if (unlikely(!whtmp)) {
- whtmp = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- /* no estimation for dir size */
- rdhash = au_sbi(sb)->si_rdhash;
- if (!rdhash)
- rdhash = AUFS_RDHASH_DEF;
- err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp);
- if (unlikely(err)) {
- au_delayed_kfree(whtmp);
- whtmp = ERR_PTR(err);
- }
-
-out:
- return whtmp;
-}
-
-void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp)
-{
- if (whtmp->br)
- au_br_put(whtmp->br);
- dput(whtmp->wh_dentry);
- iput(whtmp->dir);
- au_nhash_wh_free(&whtmp->whlist);
- au_delayed_kfree(whtmp);
-}
-
-/*
- * rmdir the whiteouted temporary named dir @h_dentry.
- * @whlist: whiteouted children.
- */
-int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_nhash *whlist)
-{
- int err;
- unsigned int h_nlink;
- struct path h_tmp;
- struct inode *wh_inode, *h_dir;
- struct au_branch *br;
-
- h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */
- IMustLock(h_dir);
-
- br = au_sbr(dir->i_sb, bindex);
- wh_inode = d_inode(wh_dentry);
- inode_lock_nested(wh_inode, AuLsc_I_CHILD);
-
- /*
- * someone else might change some whiteouts while we were sleeping.
- * it means this whlist may have an obsoleted entry.
- */
- if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE))
- err = del_wh_children(wh_dentry, whlist, bindex, br);
- else {
- int wkq_err;
- struct del_wh_children_args args = {
- .errp = &err,
- .h_dentry = wh_dentry,
- .whlist = whlist,
- .bindex = bindex,
- .br = br
- };
-
- wkq_err = au_wkq_wait(call_del_wh_children, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
- }
- inode_unlock(wh_inode);
-
- if (!err) {
- h_tmp.dentry = wh_dentry;
- h_tmp.mnt = au_br_mnt(br);
- h_nlink = h_dir->i_nlink;
- err = vfsub_rmdir(h_dir, &h_tmp);
- /* some fs doesn't change the parent nlink in some cases */
- h_nlink -= h_dir->i_nlink;
- }
-
- if (!err) {
- if (au_ibtop(dir) == bindex) {
- /* todo: dir->i_mutex is necessary */
- au_cpup_attr_timesizes(dir);
- if (h_nlink)
- vfsub_drop_nlink(dir);
- }
- return 0; /* success */
- }
-
- pr_warn("failed removing %pd(%d), ignored\n", wh_dentry, err);
- return err;
-}
-
-static void call_rmdir_whtmp(void *args)
-{
- int err;
- aufs_bindex_t bindex;
- struct au_whtmp_rmdir *a = args;
- struct super_block *sb;
- struct dentry *h_parent;
- struct inode *h_dir;
- struct au_hinode *hdir;
-
- /* rmdir by nfsd may cause deadlock with this i_mutex */
- /* inode_lock(a->dir); */
- err = -EROFS;
- sb = a->dir->i_sb;
- si_read_lock(sb, !AuLock_FLUSH);
- if (!au_br_writable(a->br->br_perm))
- goto out;
- bindex = au_br_index(sb, a->br->br_id);
- if (unlikely(bindex < 0))
- goto out;
-
- err = -EIO;
- ii_write_lock_parent(a->dir);
- h_parent = dget_parent(a->wh_dentry);
- h_dir = d_inode(h_parent);
- hdir = au_hi(a->dir, bindex);
- err = vfsub_mnt_want_write(au_br_mnt(a->br));
- if (unlikely(err))
- goto out_mnt;
- au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT);
- err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent,
- a->br);
- if (!err)
- err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, &a->whlist);
- au_hn_inode_unlock(hdir);
- vfsub_mnt_drop_write(au_br_mnt(a->br));
-
-out_mnt:
- dput(h_parent);
- ii_write_unlock(a->dir);
-out:
- /* inode_unlock(a->dir); */
- au_whtmp_rmdir_free(a);
- si_read_unlock(sb);
- au_nwt_done(&au_sbi(sb)->si_nowait);
- if (unlikely(err))
- AuIOErr("err %d\n", err);
-}
-
-void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_whtmp_rmdir *args)
-{
- int wkq_err;
- struct super_block *sb;
-
- IMustLock(dir);
-
- /* all post-process will be done in do_rmdir_whtmp(). */
- sb = dir->i_sb;
- args->dir = au_igrab(dir);
- args->br = au_sbr(sb, bindex);
- au_br_get(args->br);
- args->wh_dentry = dget(wh_dentry);
- wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0);
- if (unlikely(wkq_err)) {
- pr_warn("rmdir error %pd (%d), ignored\n", wh_dentry, wkq_err);
- au_whtmp_rmdir_free(args);
- }
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * whiteout for logical deletion and opaque directory
- */
-
-#ifndef __AUFS_WHOUT_H__
-#define __AUFS_WHOUT_H__
-
-#ifdef __KERNEL__
-
-#include "dir.h"
-
-/* whout.c */
-int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
-int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio);
-int au_diropq_test(struct dentry *h_dentry);
-struct au_branch;
-struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
- struct qstr *prefix);
-int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
-int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
- struct dentry *dentry);
-int au_wh_init(struct au_branch *br, struct super_block *sb);
-
-/* diropq flags */
-#define AuDiropq_CREATE 1
-#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name)
-#define au_fset_diropq(flags, name) \
- do { (flags) |= AuDiropq_##name; } while (0)
-#define au_fclr_diropq(flags, name) \
- do { (flags) &= ~AuDiropq_##name; } while (0)
-
-struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
- unsigned int flags);
-struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
- struct au_branch *br);
-struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_parent);
-
-/* real rmdir for the whiteout-ed dir */
-struct au_whtmp_rmdir {
- struct inode *dir;
- struct au_branch *br;
- struct dentry *wh_dentry;
- struct au_nhash whlist;
-};
-
-struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
-void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
-int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_nhash *whlist);
-void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
- struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct dentry *au_diropq_create(struct dentry *dentry,
- aufs_bindex_t bindex)
-{
- return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
-}
-
-static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
-{
- return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_WHOUT_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * workqueue for asynchronous/super-io operations
- * todo: try new dredential scheme
- */
-
-#include <linux/module.h>
-#include "aufs.h"
-
-/* internal workqueue named AUFS_WKQ_NAME */
-
-static struct workqueue_struct *au_wkq;
-
-struct au_wkinfo {
- struct work_struct wk;
- struct kobject *kobj;
-
- unsigned int flags; /* see wkq.h */
-
- au_wkq_func_t func;
- void *args;
-
- struct completion *comp;
-};
-
-/* ---------------------------------------------------------------------- */
-
-static void wkq_func(struct work_struct *wk)
-{
- struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
-
- AuDebugOn(!uid_eq(current_fsuid(), GLOBAL_ROOT_UID));
- AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY);
-
- wkinfo->func(wkinfo->args);
- if (au_ftest_wkq(wkinfo->flags, WAIT))
- complete(wkinfo->comp);
- else {
- kobject_put(wkinfo->kobj);
- module_put(THIS_MODULE); /* todo: ?? */
- au_delayed_kfree(wkinfo);
- }
-}
-
-/*
- * Since struct completion is large, try allocating it dynamically.
- */
-#if 1 /* defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) */
-#define AuWkqCompDeclare(name) struct completion *comp = NULL
-
-static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-{
- *comp = kmalloc(sizeof(**comp), GFP_NOFS);
- if (*comp) {
- init_completion(*comp);
- wkinfo->comp = *comp;
- return 0;
- }
- return -ENOMEM;
-}
-
-static void au_wkq_comp_free(struct completion *comp)
-{
- au_delayed_kfree(comp);
-}
-
-#else
-
-/* no braces */
-#define AuWkqCompDeclare(name) \
- DECLARE_COMPLETION_ONSTACK(_ ## name); \
- struct completion *comp = &_ ## name
-
-static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-{
- wkinfo->comp = *comp;
- return 0;
-}
-
-static void au_wkq_comp_free(struct completion *comp __maybe_unused)
-{
- /* empty */
-}
-#endif /* 4KSTACKS */
-
-static void au_wkq_run(struct au_wkinfo *wkinfo)
-{
- if (au_ftest_wkq(wkinfo->flags, NEST)) {
- if (au_wkq_test()) {
- AuWarn1("wkq from wkq, unless silly-rename on NFS,"
- " due to a dead dir by UDBA?\n");
- AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT));
- }
- } else
- au_dbg_verify_kthread();
-
- if (au_ftest_wkq(wkinfo->flags, WAIT)) {
- INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func);
- queue_work(au_wkq, &wkinfo->wk);
- } else {
- INIT_WORK(&wkinfo->wk, wkq_func);
- schedule_work(&wkinfo->wk);
- }
-}
-
-/*
- * Be careful. It is easy to make deadlock happen.
- * processA: lock, wkq and wait
- * processB: wkq and wait, lock in wkq
- * --> deadlock
- */
-int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args)
-{
- int err;
- AuWkqCompDeclare(comp);
- struct au_wkinfo wkinfo = {
- .flags = flags,
- .func = func,
- .args = args
- };
-
- err = au_wkq_comp_alloc(&wkinfo, &comp);
- if (!err) {
- au_wkq_run(&wkinfo);
- /* no timeout, no interrupt */
- wait_for_completion(wkinfo.comp);
- au_wkq_comp_free(comp);
- destroy_work_on_stack(&wkinfo.wk);
- }
-
- return err;
-
-}
-
-/*
- * Note: dget/dput() in func for aufs dentries are not supported. It will be a
- * problem in a concurrent umounting.
- */
-int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
- unsigned int flags)
-{
- int err;
- struct au_wkinfo *wkinfo;
-
- atomic_inc(&au_sbi(sb)->si_nowait.nw_len);
-
- /*
- * wkq_func() must free this wkinfo.
- * it highly depends upon the implementation of workqueue.
- */
- err = 0;
- wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS);
- if (wkinfo) {
- wkinfo->kobj = &au_sbi(sb)->si_kobj;
- wkinfo->flags = flags & ~AuWkq_WAIT;
- wkinfo->func = func;
- wkinfo->args = args;
- wkinfo->comp = NULL;
- kobject_get(wkinfo->kobj);
- __module_get(THIS_MODULE); /* todo: ?? */
-
- au_wkq_run(wkinfo);
- } else {
- err = -ENOMEM;
- au_nwt_done(&au_sbi(sb)->si_nowait);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_nwt_init(struct au_nowait_tasks *nwt)
-{
- atomic_set(&nwt->nw_len, 0);
- /* smp_mb(); */ /* atomic_set */
- init_waitqueue_head(&nwt->nw_wq);
-}
-
-void au_wkq_fin(void)
-{
- destroy_workqueue(au_wkq);
-}
-
-int __init au_wkq_init(void)
-{
- int err;
-
- err = 0;
- au_wkq = alloc_workqueue(AUFS_WKQ_NAME, 0, WQ_DFL_ACTIVE);
- if (IS_ERR(au_wkq))
- err = PTR_ERR(au_wkq);
- else if (!au_wkq)
- err = -ENOMEM;
-
- return err;
-}
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * workqueue for asynchronous/super-io operations
- * todo: try new credentials management scheme
- */
-
-#ifndef __AUFS_WKQ_H__
-#define __AUFS_WKQ_H__
-
-#ifdef __KERNEL__
-
-#include <linux/percpu_counter.h>
-
-struct super_block;
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
- */
-struct au_nowait_tasks {
- atomic_t nw_len;
- wait_queue_head_t nw_wq;
-};
-
-/* ---------------------------------------------------------------------- */
-
-typedef void (*au_wkq_func_t)(void *args);
-
-/* wkq flags */
-#define AuWkq_WAIT 1
-#define AuWkq_NEST (1 << 1)
-#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
-#define au_fset_wkq(flags, name) \
- do { (flags) |= AuWkq_##name; } while (0)
-#define au_fclr_wkq(flags, name) \
- do { (flags) &= ~AuWkq_##name; } while (0)
-
-#ifndef CONFIG_AUFS_HNOTIFY
-#undef AuWkq_NEST
-#define AuWkq_NEST 0
-#endif
-
-/* wkq.c */
-int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
-int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
- unsigned int flags);
-void au_nwt_init(struct au_nowait_tasks *nwt);
-int __init au_wkq_init(void);
-void au_wkq_fin(void);
-
-/* ---------------------------------------------------------------------- */
-
-static inline int au_wkq_test(void)
-{
- return current->flags & PF_WQ_WORKER;
-}
-
-static inline int au_wkq_wait(au_wkq_func_t func, void *args)
-{
- return au_wkq_do_wait(AuWkq_WAIT, func, args);
-}
-
-static inline void au_nwt_done(struct au_nowait_tasks *nwt)
-{
- if (atomic_dec_and_test(&nwt->nw_len))
- wake_up_all(&nwt->nw_wq);
-}
-
-static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
-{
- wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
- return 0;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_WKQ_H__ */
+++ /dev/null
-/*
- * Copyright (C) 2014-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * handling xattr functions
- */
-
-#include <linux/xattr.h>
-#include "aufs.h"
-
-static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags)
-{
- if (!ignore_flags)
- goto out;
- switch (err) {
- case -ENOMEM:
- case -EDQUOT:
- goto out;
- }
-
- if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) {
- err = 0;
- goto out;
- }
-
-#define cmp(brattr, prefix) do { \
- if (!strncmp(name, XATTR_##prefix##_PREFIX, \
- XATTR_##prefix##_PREFIX_LEN)) { \
- if (ignore_flags & AuBrAttr_ICEX_##brattr) \
- err = 0; \
- goto out; \
- } \
- } while (0)
-
- cmp(SEC, SECURITY);
- cmp(SYS, SYSTEM);
- cmp(TR, TRUSTED);
- cmp(USR, USER);
-#undef cmp
-
- if (ignore_flags & AuBrAttr_ICEX_OTH)
- err = 0;
-
-out:
- return err;
-}
-
-static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1;
-
-static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src,
- char *name, char **buf, unsigned int ignore_flags,
- unsigned int verbose)
-{
- int err;
- ssize_t ssz;
- struct inode *h_idst;
-
- ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS);
- err = ssz;
- if (unlikely(err <= 0)) {
- if (err == -ENODATA
- || (err == -EOPNOTSUPP
- && ((ignore_flags & au_xattr_out_of_list)
- || (au_test_nfs_noacl(d_inode(h_src))
- && (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS)
- || !strcmp(name,
- XATTR_NAME_POSIX_ACL_DEFAULT))))
- ))
- err = 0;
- if (err && (verbose || au_debug_test()))
- pr_err("%s, err %d\n", name, err);
- goto out;
- }
-
- /* unlock it temporary */
- h_idst = d_inode(h_dst);
- inode_unlock(h_idst);
- err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0);
- inode_lock_nested(h_idst, AuLsc_I_CHILD2);
- if (unlikely(err)) {
- if (verbose || au_debug_test())
- pr_err("%s, err %d\n", name, err);
- err = au_xattr_ignore(err, name, ignore_flags);
- }
-
-out:
- return err;
-}
-
-int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags,
- unsigned int verbose)
-{
- int err, unlocked, acl_access, acl_default;
- ssize_t ssz;
- struct inode *h_isrc, *h_idst;
- char *value, *p, *o, *e;
-
- /* try stopping to update the source inode while we are referencing */
- /* there should not be the parent-child relationship between them */
- h_isrc = d_inode(h_src);
- h_idst = d_inode(h_dst);
- inode_unlock(h_idst);
- inode_lock_nested(h_isrc, AuLsc_I_CHILD);
- inode_lock_nested(h_idst, AuLsc_I_CHILD2);
- unlocked = 0;
-
- /* some filesystems don't list POSIX ACL, for example tmpfs */
- ssz = vfs_listxattr(h_src, NULL, 0);
- err = ssz;
- if (unlikely(err < 0)) {
- AuTraceErr(err);
- if (err == -ENODATA
- || err == -EOPNOTSUPP)
- err = 0; /* ignore */
- goto out;
- }
-
- err = 0;
- p = NULL;
- o = NULL;
- if (ssz) {
- err = -ENOMEM;
- p = kmalloc(ssz, GFP_NOFS);
- o = p;
- if (unlikely(!p))
- goto out;
- err = vfs_listxattr(h_src, p, ssz);
- }
- inode_unlock(h_isrc);
- unlocked = 1;
- AuDbg("err %d, ssz %zd\n", err, ssz);
- if (unlikely(err < 0))
- goto out_free;
-
- err = 0;
- e = p + ssz;
- value = NULL;
- acl_access = 0;
- acl_default = 0;
- while (!err && p < e) {
- acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS,
- sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1);
- acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT,
- sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)
- - 1);
- err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags,
- verbose);
- p += strlen(p) + 1;
- }
- AuTraceErr(err);
- ignore_flags |= au_xattr_out_of_list;
- if (!err && !acl_access) {
- err = au_do_cpup_xattr(h_dst, h_src,
- XATTR_NAME_POSIX_ACL_ACCESS, &value,
- ignore_flags, verbose);
- AuTraceErr(err);
- }
- if (!err && !acl_default) {
- err = au_do_cpup_xattr(h_dst, h_src,
- XATTR_NAME_POSIX_ACL_DEFAULT, &value,
- ignore_flags, verbose);
- AuTraceErr(err);
- }
-
- if (value)
- au_delayed_kfree(value);
-
-out_free:
- if (o)
- au_delayed_kfree(o);
-out:
- if (!unlocked)
- inode_unlock(h_isrc);
- AuTraceErr(err);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-enum {
- AU_XATTR_LIST,
- AU_XATTR_GET
-};
-
-struct au_lgxattr {
- int type;
- union {
- struct {
- char *list;
- size_t size;
- } list;
- struct {
- const char *name;
- void *value;
- size_t size;
- } get;
- } u;
-};
-
-static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg)
-{
- ssize_t err;
- struct path h_path;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
- if (unlikely(err))
- goto out;
- err = au_h_path_getattr(dentry, /*force*/1, &h_path);
- if (unlikely(err))
- goto out_si;
- if (unlikely(!h_path.dentry))
- /* illegally overlapped or something */
- goto out_di; /* pretending success */
-
- /* always topmost entry only */
- switch (arg->type) {
- case AU_XATTR_LIST:
- err = vfs_listxattr(h_path.dentry,
- arg->u.list.list, arg->u.list.size);
- break;
- case AU_XATTR_GET:
- AuDebugOn(d_is_negative(h_path.dentry));
- err = vfs_getxattr(h_path.dentry,
- arg->u.get.name, arg->u.get.value,
- arg->u.get.size);
- break;
- }
-
-out_di:
- di_read_unlock(dentry, AuLock_IR);
-out_si:
- si_read_unlock(sb);
-out:
- AuTraceErr(err);
- return err;
-}
-
-ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size)
-{
- struct au_lgxattr arg = {
- .type = AU_XATTR_LIST,
- .u.list = {
- .list = list,
- .size = size
- },
- };
-
- return au_lgxattr(dentry, &arg);
-}
-
-ssize_t aufs_getxattr(struct dentry *dentry, struct inode *inode __maybe_unused,
- const char *name, void *value, size_t size)
-{
- struct au_lgxattr arg = {
- .type = AU_XATTR_GET,
- .u.get = {
- .name = name,
- .value = value,
- .size = size
- },
- };
-
- return au_lgxattr(dentry, &arg);
-}
-
-int aufs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
- const void *value, size_t size, int flags)
-{
- struct au_srxattr arg = {
- .type = AU_XATTR_SET,
- .u.set = {
- .name = name,
- .value = value,
- .size = size,
- .flags = flags
- },
- };
-
- return au_srxattr(dentry, inode, &arg);
-}
-
-int aufs_removexattr(struct dentry *dentry, const char *name)
-{
- struct au_srxattr arg = {
- .type = AU_XATTR_REMOVE,
- .u.remove = {
- .name = name
- },
- };
-
- return au_srxattr(dentry, d_inode(dentry), &arg);
-}
-
-/* ---------------------------------------------------------------------- */
-
-#if 0
-static size_t au_xattr_list(struct dentry *dentry, char *list, size_t list_size,
- const char *name, size_t name_len, int type)
-{
- return aufs_listxattr(dentry, list, list_size);
-}
-
-static int au_xattr_get(struct dentry *dentry, const char *name, void *buffer,
- size_t size, int type)
-{
- return aufs_getxattr(dentry, name, buffer, size);
-}
-
-static int au_xattr_set(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags, int type)
-{
- return aufs_setxattr(dentry, name, value, size, flags);
-}
-
-static const struct xattr_handler au_xattr_handler = {
- /* no prefix, no flags */
- .list = au_xattr_list,
- .get = au_xattr_get,
- .set = au_xattr_set
- /* why no remove? */
-};
-
-static const struct xattr_handler *au_xattr_handlers[] = {
- &au_xattr_handler
-};
-
-void au_xattr_init(struct super_block *sb)
-{
- /* sb->s_xattr = au_xattr_handlers; */
-}
-#endif
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * external inode number translation table and bitmap
- */
-
-#include <linux/seq_file.h>
-#include <linux/statfs.h>
-#include "aufs.h"
-
-/* todo: unnecessary to support mmap_sem since kernel-space? */
-ssize_t xino_fread(vfs_readf_t func, struct file *file, void *kbuf, size_t size,
- loff_t *pos)
-{
- ssize_t err;
- mm_segment_t oldfs;
- union {
- void *k;
- char __user *u;
- } buf;
-
- buf.k = kbuf;
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- do {
- /* todo: signal_pending? */
- err = func(file, buf.u, size, pos);
- } while (err == -EAGAIN || err == -EINTR);
- set_fs(oldfs);
-
-#if 0 /* reserved for future use */
- if (err > 0)
- fsnotify_access(file->f_path.dentry);
-#endif
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf,
- size_t size, loff_t *pos);
-
-static ssize_t do_xino_fwrite(vfs_writef_t func, struct file *file, void *kbuf,
- size_t size, loff_t *pos)
-{
- ssize_t err;
- mm_segment_t oldfs;
- union {
- void *k;
- const char __user *u;
- } buf;
- int i;
- const int prevent_endless = 10;
-
- i = 0;
- buf.k = kbuf;
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- do {
- err = func(file, buf.u, size, pos);
- if (err == -EINTR
- && !au_wkq_test()
- && fatal_signal_pending(current)) {
- set_fs(oldfs);
- err = xino_fwrite_wkq(func, file, kbuf, size, pos);
- BUG_ON(err == -EINTR);
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- }
- } while (i++ < prevent_endless
- && (err == -EAGAIN || err == -EINTR));
- set_fs(oldfs);
-
-#if 0 /* reserved for future use */
- if (err > 0)
- fsnotify_modify(file->f_path.dentry);
-#endif
-
- return err;
-}
-
-struct do_xino_fwrite_args {
- ssize_t *errp;
- vfs_writef_t func;
- struct file *file;
- void *buf;
- size_t size;
- loff_t *pos;
-};
-
-static void call_do_xino_fwrite(void *args)
-{
- struct do_xino_fwrite_args *a = args;
- *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
-}
-
-static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf,
- size_t size, loff_t *pos)
-{
- ssize_t err;
- int wkq_err;
- struct do_xino_fwrite_args args = {
- .errp = &err,
- .func = func,
- .file = file,
- .buf = buf,
- .size = size,
- .pos = pos
- };
-
- /*
- * it breaks RLIMIT_FSIZE and normal user's limit,
- * users should care about quota and real 'filesystem full.'
- */
- wkq_err = au_wkq_wait(call_do_xino_fwrite, &args);
- if (unlikely(wkq_err))
- err = wkq_err;
-
- return err;
-}
-
-ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf,
- size_t size, loff_t *pos)
-{
- ssize_t err;
-
- if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) {
- lockdep_off();
- err = do_xino_fwrite(func, file, buf, size, pos);
- lockdep_on();
- } else
- err = xino_fwrite_wkq(func, file, buf, size, pos);
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create a new xinofile at the same place/path as @base_file.
- */
-struct file *au_xino_create2(struct file *base_file, struct file *copy_src)
-{
- struct file *file;
- struct dentry *base, *parent;
- struct inode *dir, *delegated;
- struct qstr *name;
- struct path path;
- int err;
-
- base = base_file->f_path.dentry;
- parent = base->d_parent; /* dir inode is locked */
- dir = d_inode(parent);
- IMustLock(dir);
-
- file = ERR_PTR(-EINVAL);
- name = &base->d_name;
- path.dentry = vfsub_lookup_one_len(name->name, parent, name->len);
- if (IS_ERR(path.dentry)) {
- file = (void *)path.dentry;
- pr_err("%pd lookup err %ld\n",
- base, PTR_ERR(path.dentry));
- goto out;
- }
-
- /* no need to mnt_want_write() since we call dentry_open() later */
- err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL);
- if (unlikely(err)) {
- file = ERR_PTR(err);
- pr_err("%pd create err %d\n", base, err);
- goto out_dput;
- }
-
- path.mnt = base_file->f_path.mnt;
- file = vfsub_dentry_open(&path,
- O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
- /* | __FMODE_NONOTIFY */);
- if (IS_ERR(file)) {
- pr_err("%pd open err %ld\n", base, PTR_ERR(file));
- goto out_dput;
- }
-
- delegated = NULL;
- err = vfsub_unlink(dir, &file->f_path, &delegated, /*force*/0);
- if (unlikely(err == -EWOULDBLOCK)) {
- pr_warn("cannot retry for NFSv4 delegation"
- " for an internal unlink\n");
- iput(delegated);
- }
- if (unlikely(err)) {
- pr_err("%pd unlink err %d\n", base, err);
- goto out_fput;
- }
-
- if (copy_src) {
- /* no one can touch copy_src xino */
- err = au_copy_file(file, copy_src, vfsub_f_size_read(copy_src));
- if (unlikely(err)) {
- pr_err("%pd copy err %d\n", base, err);
- goto out_fput;
- }
- }
- goto out_dput; /* success */
-
-out_fput:
- fput(file);
- file = ERR_PTR(err);
-out_dput:
- dput(path.dentry);
-out:
- return file;
-}
-
-struct au_xino_lock_dir {
- struct au_hinode *hdir;
- struct dentry *parent;
- struct inode *dir;
-};
-
-static void au_xino_lock_dir(struct super_block *sb, struct file *xino,
- struct au_xino_lock_dir *ldir)
-{
- aufs_bindex_t brid, bindex;
-
- ldir->hdir = NULL;
- bindex = -1;
- brid = au_xino_brid(sb);
- if (brid >= 0)
- bindex = au_br_index(sb, brid);
- if (bindex >= 0) {
- ldir->hdir = au_hi(d_inode(sb->s_root), bindex);
- au_hn_inode_lock_nested(ldir->hdir, AuLsc_I_PARENT);
- } else {
- ldir->parent = dget_parent(xino->f_path.dentry);
- ldir->dir = d_inode(ldir->parent);
- inode_lock_nested(ldir->dir, AuLsc_I_PARENT);
- }
-}
-
-static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
-{
- if (ldir->hdir)
- au_hn_inode_unlock(ldir->hdir);
- else {
- inode_unlock(ldir->dir);
- dput(ldir->parent);
- }
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* trucate xino files asynchronously */
-
-int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err;
- unsigned long jiffy;
- blkcnt_t blocks;
- aufs_bindex_t bi, bbot;
- struct kstatfs *st;
- struct au_branch *br;
- struct file *new_xino, *file;
- struct super_block *h_sb;
- struct au_xino_lock_dir ldir;
-
- err = -ENOMEM;
- st = kmalloc(sizeof(*st), GFP_NOFS);
- if (unlikely(!st))
- goto out;
-
- err = -EINVAL;
- bbot = au_sbbot(sb);
- if (unlikely(bindex < 0 || bbot < bindex))
- goto out_st;
- br = au_sbr(sb, bindex);
- file = br->br_xino.xi_file;
- if (!file)
- goto out_st;
-
- err = vfs_statfs(&file->f_path, st);
- if (unlikely(err))
- AuErr1("statfs err %d, ignored\n", err);
- jiffy = jiffies;
- blocks = file_inode(file)->i_blocks;
- pr_info("begin truncating xino(b%d), ib%llu, %llu/%llu free blks\n",
- bindex, (u64)blocks, st->f_bfree, st->f_blocks);
-
- au_xino_lock_dir(sb, file, &ldir);
- /* mnt_want_write() is unnecessary here */
- new_xino = au_xino_create2(file, file);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(new_xino);
- if (IS_ERR(new_xino)) {
- pr_err("err %d, ignored\n", err);
- goto out_st;
- }
- err = 0;
- fput(file);
- br->br_xino.xi_file = new_xino;
-
- h_sb = au_br_sb(br);
- for (bi = 0; bi <= bbot; bi++) {
- if (unlikely(bi == bindex))
- continue;
- br = au_sbr(sb, bi);
- if (au_br_sb(br) != h_sb)
- continue;
-
- fput(br->br_xino.xi_file);
- br->br_xino.xi_file = new_xino;
- get_file(new_xino);
- }
-
- err = vfs_statfs(&new_xino->f_path, st);
- if (!err) {
- pr_info("end truncating xino(b%d), ib%llu, %llu/%llu free blks\n",
- bindex, (u64)file_inode(new_xino)->i_blocks,
- st->f_bfree, st->f_blocks);
- if (file_inode(new_xino)->i_blocks < blocks)
- au_sbi(sb)->si_xino_jiffy = jiffy;
- } else
- AuErr1("statfs err %d, ignored\n", err);
-
-out_st:
- au_delayed_kfree(st);
-out:
- return err;
-}
-
-struct xino_do_trunc_args {
- struct super_block *sb;
- struct au_branch *br;
-};
-
-static void xino_do_trunc(void *_args)
-{
- struct xino_do_trunc_args *args = _args;
- struct super_block *sb;
- struct au_branch *br;
- struct inode *dir;
- int err;
- aufs_bindex_t bindex;
-
- err = 0;
- sb = args->sb;
- dir = d_inode(sb->s_root);
- br = args->br;
-
- si_noflush_write_lock(sb);
- ii_read_lock_parent(dir);
- bindex = au_br_index(sb, br->br_id);
- err = au_xino_trunc(sb, bindex);
- ii_read_unlock(dir);
- if (unlikely(err))
- pr_warn("err b%d, (%d)\n", bindex, err);
- atomic_dec(&br->br_xino_running);
- au_br_put(br);
- si_write_unlock(sb);
- au_nwt_done(&au_sbi(sb)->si_nowait);
- au_delayed_kfree(args);
-}
-
-static int xino_trunc_test(struct super_block *sb, struct au_branch *br)
-{
- int err;
- struct kstatfs st;
- struct au_sbinfo *sbinfo;
-
- /* todo: si_xino_expire and the ratio should be customizable */
- sbinfo = au_sbi(sb);
- if (time_before(jiffies,
- sbinfo->si_xino_jiffy + sbinfo->si_xino_expire))
- return 0;
-
- /* truncation border */
- err = vfs_statfs(&br->br_xino.xi_file->f_path, &st);
- if (unlikely(err)) {
- AuErr1("statfs err %d, ignored\n", err);
- return 0;
- }
- if (div64_u64(st.f_bfree * 100, st.f_blocks) >= AUFS_XINO_DEF_TRUNC)
- return 0;
-
- return 1;
-}
-
-static void xino_try_trunc(struct super_block *sb, struct au_branch *br)
-{
- struct xino_do_trunc_args *args;
- int wkq_err;
-
- if (!xino_trunc_test(sb, br))
- return;
-
- if (atomic_inc_return(&br->br_xino_running) > 1)
- goto out;
-
- /* lock and kfree() will be called in trunc_xino() */
- args = kmalloc(sizeof(*args), GFP_NOFS);
- if (unlikely(!args)) {
- AuErr1("no memory\n");
- goto out;
- }
-
- au_br_get(br);
- args->sb = sb;
- args->br = br;
- wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0);
- if (!wkq_err)
- return; /* success */
-
- pr_err("wkq %d\n", wkq_err);
- au_br_put(br);
- au_delayed_kfree(args);
-
-out:
- atomic_dec(&br->br_xino_running);
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_xino_do_write(vfs_writef_t write, struct file *file,
- ino_t h_ino, ino_t ino)
-{
- loff_t pos;
- ssize_t sz;
-
- pos = h_ino;
- if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) {
- AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
- return -EFBIG;
- }
- pos *= sizeof(ino);
- sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos);
- if (sz == sizeof(ino))
- return 0; /* success */
-
- AuIOErr("write failed (%zd)\n", sz);
- return -EIO;
-}
-
-/*
- * write @ino to the xinofile for the specified branch{@sb, @bindex}
- * at the position of @h_ino.
- * even if @ino is zero, it is written to the xinofile and means no entry.
- * if the size of the xino file on a specific filesystem exceeds the watermark,
- * try truncating it.
- */
-int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t ino)
-{
- int err;
- unsigned int mnt_flags;
- struct au_branch *br;
-
- BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max)
- || ((loff_t)-1) > 0);
- SiMustAnyLock(sb);
-
- mnt_flags = au_mntflags(sb);
- if (!au_opt_test(mnt_flags, XINO))
- return 0;
-
- br = au_sbr(sb, bindex);
- err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
- h_ino, ino);
- if (!err) {
- if (au_opt_test(mnt_flags, TRUNC_XINO)
- && au_test_fs_trunc_xino(au_br_sb(br)))
- xino_try_trunc(sb, br);
- return 0; /* success */
- }
-
- AuIOErr("write failed (%d)\n", err);
- return -EIO;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* aufs inode number bitmap */
-
-static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE;
-static ino_t xib_calc_ino(unsigned long pindex, int bit)
-{
- ino_t ino;
-
- AuDebugOn(bit < 0 || page_bits <= bit);
- ino = AUFS_FIRST_INO + pindex * page_bits + bit;
- return ino;
-}
-
-static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit)
-{
- AuDebugOn(ino < AUFS_FIRST_INO);
- ino -= AUFS_FIRST_INO;
- *pindex = ino / page_bits;
- *bit = ino % page_bits;
-}
-
-static int xib_pindex(struct super_block *sb, unsigned long pindex)
-{
- int err;
- loff_t pos;
- ssize_t sz;
- struct au_sbinfo *sbinfo;
- struct file *xib;
- unsigned long *p;
-
- sbinfo = au_sbi(sb);
- MtxMustLock(&sbinfo->si_xib_mtx);
- AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE
- || !au_opt_test(sbinfo->si_mntflags, XINO));
-
- if (pindex == sbinfo->si_xib_last_pindex)
- return 0;
-
- xib = sbinfo->si_xib;
- p = sbinfo->si_xib_buf;
- pos = sbinfo->si_xib_last_pindex;
- pos *= PAGE_SIZE;
- sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
- if (unlikely(sz != PAGE_SIZE))
- goto out;
-
- pos = pindex;
- pos *= PAGE_SIZE;
- if (vfsub_f_size_read(xib) >= pos + PAGE_SIZE)
- sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos);
- else {
- memset(p, 0, PAGE_SIZE);
- sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
- }
- if (sz == PAGE_SIZE) {
- sbinfo->si_xib_last_pindex = pindex;
- return 0; /* success */
- }
-
-out:
- AuIOErr1("write failed (%zd)\n", sz);
- err = sz;
- if (sz >= 0)
- err = -EIO;
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void au_xib_clear_bit(struct inode *inode)
-{
- int err, bit;
- unsigned long pindex;
- struct super_block *sb;
- struct au_sbinfo *sbinfo;
-
- AuDebugOn(inode->i_nlink);
-
- sb = inode->i_sb;
- xib_calc_bit(inode->i_ino, &pindex, &bit);
- AuDebugOn(page_bits <= bit);
- sbinfo = au_sbi(sb);
- mutex_lock(&sbinfo->si_xib_mtx);
- err = xib_pindex(sb, pindex);
- if (!err) {
- clear_bit(bit, sbinfo->si_xib_buf);
- sbinfo->si_xib_next_bit = bit;
- }
- mutex_unlock(&sbinfo->si_xib_mtx);
-}
-
-/* for s_op->delete_inode() */
-void au_xino_delete_inode(struct inode *inode, const int unlinked)
-{
- int err;
- unsigned int mnt_flags;
- aufs_bindex_t bindex, bbot, bi;
- unsigned char try_trunc;
- struct au_iinfo *iinfo;
- struct super_block *sb;
- struct au_hinode *hi;
- struct inode *h_inode;
- struct au_branch *br;
- vfs_writef_t xwrite;
-
- AuDebugOn(au_is_bad_inode(inode));
-
- sb = inode->i_sb;
- mnt_flags = au_mntflags(sb);
- if (!au_opt_test(mnt_flags, XINO)
- || inode->i_ino == AUFS_ROOT_INO)
- return;
-
- if (unlinked) {
- au_xigen_inc(inode);
- au_xib_clear_bit(inode);
- }
-
- iinfo = au_ii(inode);
- bindex = iinfo->ii_btop;
- if (bindex < 0)
- return;
-
- xwrite = au_sbi(sb)->si_xwrite;
- try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO);
- hi = au_hinode(iinfo, bindex);
- bbot = iinfo->ii_bbot;
- for (; bindex <= bbot; bindex++, hi++) {
- h_inode = hi->hi_inode;
- if (!h_inode
- || (!unlinked && h_inode->i_nlink))
- continue;
-
- /* inode may not be revalidated */
- bi = au_br_index(sb, hi->hi_id);
- if (bi < 0)
- continue;
-
- br = au_sbr(sb, bi);
- err = au_xino_do_write(xwrite, br->br_xino.xi_file,
- h_inode->i_ino, /*ino*/0);
- if (!err && try_trunc
- && au_test_fs_trunc_xino(au_br_sb(br)))
- xino_try_trunc(sb, br);
- }
-}
-
-/* get an unused inode number from bitmap */
-ino_t au_xino_new_ino(struct super_block *sb)
-{
- ino_t ino;
- unsigned long *p, pindex, ul, pend;
- struct au_sbinfo *sbinfo;
- struct file *file;
- int free_bit, err;
-
- if (!au_opt_test(au_mntflags(sb), XINO))
- return iunique(sb, AUFS_FIRST_INO);
-
- sbinfo = au_sbi(sb);
- mutex_lock(&sbinfo->si_xib_mtx);
- p = sbinfo->si_xib_buf;
- free_bit = sbinfo->si_xib_next_bit;
- if (free_bit < page_bits && !test_bit(free_bit, p))
- goto out; /* success */
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
-
- pindex = sbinfo->si_xib_last_pindex;
- for (ul = pindex - 1; ul < ULONG_MAX; ul--) {
- err = xib_pindex(sb, ul);
- if (unlikely(err))
- goto out_err;
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
- }
-
- file = sbinfo->si_xib;
- pend = vfsub_f_size_read(file) / PAGE_SIZE;
- for (ul = pindex + 1; ul <= pend; ul++) {
- err = xib_pindex(sb, ul);
- if (unlikely(err))
- goto out_err;
- free_bit = find_first_zero_bit(p, page_bits);
- if (free_bit < page_bits)
- goto out; /* success */
- }
- BUG();
-
-out:
- set_bit(free_bit, p);
- sbinfo->si_xib_next_bit = free_bit + 1;
- pindex = sbinfo->si_xib_last_pindex;
- mutex_unlock(&sbinfo->si_xib_mtx);
- ino = xib_calc_ino(pindex, free_bit);
- AuDbg("i%lu\n", (unsigned long)ino);
- return ino;
-out_err:
- mutex_unlock(&sbinfo->si_xib_mtx);
- AuDbg("i0\n");
- return 0;
-}
-
-/*
- * read @ino from xinofile for the specified branch{@sb, @bindex}
- * at the position of @h_ino.
- * if @ino does not exist and @do_new is true, get new one.
- */
-int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
- ino_t *ino)
-{
- int err;
- ssize_t sz;
- loff_t pos;
- struct file *file;
- struct au_sbinfo *sbinfo;
-
- *ino = 0;
- if (!au_opt_test(au_mntflags(sb), XINO))
- return 0; /* no xino */
-
- err = 0;
- sbinfo = au_sbi(sb);
- pos = h_ino;
- if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) {
- AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
- return -EFBIG;
- }
- pos *= sizeof(*ino);
-
- file = au_sbr(sb, bindex)->br_xino.xi_file;
- if (vfsub_f_size_read(file) < pos + sizeof(*ino))
- return 0; /* no ino */
-
- sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos);
- if (sz == sizeof(*ino))
- return 0; /* success */
-
- err = sz;
- if (unlikely(sz >= 0)) {
- err = -EIO;
- AuIOErr("xino read error (%zd)\n", sz);
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* create and set a new xino file */
-
-struct file *au_xino_create(struct super_block *sb, char *fname, int silent)
-{
- struct file *file;
- struct dentry *h_parent, *d;
- struct inode *h_dir, *inode;
- int err;
-
- /*
- * at mount-time, and the xino file is the default path,
- * hnotify is disabled so we have no notify events to ignore.
- * when a user specified the xino, we cannot get au_hdir to be ignored.
- */
- file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
- /* | __FMODE_NONOTIFY */,
- S_IRUGO | S_IWUGO);
- if (IS_ERR(file)) {
- if (!silent)
- pr_err("open %s(%ld)\n", fname, PTR_ERR(file));
- return file;
- }
-
- /* keep file count */
- err = 0;
- inode = file_inode(file);
- h_parent = dget_parent(file->f_path.dentry);
- h_dir = d_inode(h_parent);
- inode_lock_nested(h_dir, AuLsc_I_PARENT);
- /* mnt_want_write() is unnecessary here */
- /* no delegation since it is just created */
- if (inode->i_nlink)
- err = vfsub_unlink(h_dir, &file->f_path, /*delegated*/NULL,
- /*force*/0);
- inode_unlock(h_dir);
- dput(h_parent);
- if (unlikely(err)) {
- if (!silent)
- pr_err("unlink %s(%d)\n", fname, err);
- goto out;
- }
-
- err = -EINVAL;
- d = file->f_path.dentry;
- if (unlikely(sb == d->d_sb)) {
- if (!silent)
- pr_err("%s must be outside\n", fname);
- goto out;
- }
- if (unlikely(au_test_fs_bad_xino(d->d_sb))) {
- if (!silent)
- pr_err("xino doesn't support %s(%s)\n",
- fname, au_sbtype(d->d_sb));
- goto out;
- }
- return file; /* success */
-
-out:
- fput(file);
- file = ERR_PTR(err);
- return file;
-}
-
-/*
- * find another branch who is on the same filesystem of the specified
- * branch{@btgt}. search until @bbot.
- */
-static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
- aufs_bindex_t bbot)
-{
- aufs_bindex_t bindex;
- struct super_block *tgt_sb = au_sbr_sb(sb, btgt);
-
- for (bindex = 0; bindex < btgt; bindex++)
- if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
- return bindex;
- for (bindex++; bindex <= bbot; bindex++)
- if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
- return bindex;
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * initialize the xinofile for the specified branch @br
- * at the place/path where @base_file indicates.
- * test whether another branch is on the same filesystem or not,
- * if @do_test is true.
- */
-int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino,
- struct file *base_file, int do_test)
-{
- int err;
- ino_t ino;
- aufs_bindex_t bbot, bindex;
- struct au_branch *shared_br, *b;
- struct file *file;
- struct super_block *tgt_sb;
-
- shared_br = NULL;
- bbot = au_sbbot(sb);
- if (do_test) {
- tgt_sb = au_br_sb(br);
- for (bindex = 0; bindex <= bbot; bindex++) {
- b = au_sbr(sb, bindex);
- if (tgt_sb == au_br_sb(b)) {
- shared_br = b;
- break;
- }
- }
- }
-
- if (!shared_br || !shared_br->br_xino.xi_file) {
- struct au_xino_lock_dir ldir;
-
- au_xino_lock_dir(sb, base_file, &ldir);
- /* mnt_want_write() is unnecessary here */
- file = au_xino_create2(base_file, NULL);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- br->br_xino.xi_file = file;
- } else {
- br->br_xino.xi_file = shared_br->br_xino.xi_file;
- get_file(br->br_xino.xi_file);
- }
-
- ino = AUFS_ROOT_INO;
- err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
- h_ino, ino);
- if (unlikely(err)) {
- fput(br->br_xino.xi_file);
- br->br_xino.xi_file = NULL;
- }
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* trucate a xino bitmap file */
-
-/* todo: slow */
-static int do_xib_restore(struct super_block *sb, struct file *file, void *page)
-{
- int err, bit;
- ssize_t sz;
- unsigned long pindex;
- loff_t pos, pend;
- struct au_sbinfo *sbinfo;
- vfs_readf_t func;
- ino_t *ino;
- unsigned long *p;
-
- err = 0;
- sbinfo = au_sbi(sb);
- MtxMustLock(&sbinfo->si_xib_mtx);
- p = sbinfo->si_xib_buf;
- func = sbinfo->si_xread;
- pend = vfsub_f_size_read(file);
- pos = 0;
- while (pos < pend) {
- sz = xino_fread(func, file, page, PAGE_SIZE, &pos);
- err = sz;
- if (unlikely(sz <= 0))
- goto out;
-
- err = 0;
- for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) {
- if (unlikely(*ino < AUFS_FIRST_INO))
- continue;
-
- xib_calc_bit(*ino, &pindex, &bit);
- AuDebugOn(page_bits <= bit);
- err = xib_pindex(sb, pindex);
- if (!err)
- set_bit(bit, p);
- else
- goto out;
- }
- }
-
-out:
- return err;
-}
-
-static int xib_restore(struct super_block *sb)
-{
- int err;
- aufs_bindex_t bindex, bbot;
- void *page;
-
- err = -ENOMEM;
- page = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!page))
- goto out;
-
- err = 0;
- bbot = au_sbbot(sb);
- for (bindex = 0; !err && bindex <= bbot; bindex++)
- if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0)
- err = do_xib_restore
- (sb, au_sbr(sb, bindex)->br_xino.xi_file, page);
- else
- AuDbg("b%d\n", bindex);
- au_delayed_free_page((unsigned long)page);
-
-out:
- return err;
-}
-
-int au_xib_trunc(struct super_block *sb)
-{
- int err;
- ssize_t sz;
- loff_t pos;
- struct au_xino_lock_dir ldir;
- struct au_sbinfo *sbinfo;
- unsigned long *p;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- err = 0;
- sbinfo = au_sbi(sb);
- if (!au_opt_test(sbinfo->si_mntflags, XINO))
- goto out;
-
- file = sbinfo->si_xib;
- if (vfsub_f_size_read(file) <= PAGE_SIZE)
- goto out;
-
- au_xino_lock_dir(sb, file, &ldir);
- /* mnt_want_write() is unnecessary here */
- file = au_xino_create2(sbinfo->si_xib, NULL);
- au_xino_unlock_dir(&ldir);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- fput(sbinfo->si_xib);
- sbinfo->si_xib = file;
-
- p = sbinfo->si_xib_buf;
- memset(p, 0, PAGE_SIZE);
- pos = 0;
- sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos);
- if (unlikely(sz != PAGE_SIZE)) {
- err = sz;
- AuIOErr("err %d\n", err);
- if (sz >= 0)
- err = -EIO;
- goto out;
- }
-
- mutex_lock(&sbinfo->si_xib_mtx);
- /* mnt_want_write() is unnecessary here */
- err = xib_restore(sb);
- mutex_unlock(&sbinfo->si_xib_mtx);
-
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * xino mount option handlers
- */
-
-/* xino bitmap */
-static void xino_clear_xib(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- sbinfo->si_xread = NULL;
- sbinfo->si_xwrite = NULL;
- if (sbinfo->si_xib)
- fput(sbinfo->si_xib);
- sbinfo->si_xib = NULL;
- if (sbinfo->si_xib_buf)
- au_delayed_free_page((unsigned long)sbinfo->si_xib_buf);
- sbinfo->si_xib_buf = NULL;
-}
-
-static int au_xino_set_xib(struct super_block *sb, struct file *base)
-{
- int err;
- loff_t pos;
- struct au_sbinfo *sbinfo;
- struct file *file;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- file = au_xino_create2(base, sbinfo->si_xib);
- err = PTR_ERR(file);
- if (IS_ERR(file))
- goto out;
- if (sbinfo->si_xib)
- fput(sbinfo->si_xib);
- sbinfo->si_xib = file;
- sbinfo->si_xread = vfs_readf(file);
- sbinfo->si_xwrite = vfs_writef(file);
-
- err = -ENOMEM;
- if (!sbinfo->si_xib_buf)
- sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS);
- if (unlikely(!sbinfo->si_xib_buf))
- goto out_unset;
-
- sbinfo->si_xib_last_pindex = 0;
- sbinfo->si_xib_next_bit = 0;
- if (vfsub_f_size_read(file) < PAGE_SIZE) {
- pos = 0;
- err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf,
- PAGE_SIZE, &pos);
- if (unlikely(err != PAGE_SIZE))
- goto out_free;
- }
- err = 0;
- goto out; /* success */
-
-out_free:
- if (sbinfo->si_xib_buf)
- au_delayed_free_page((unsigned long)sbinfo->si_xib_buf);
- sbinfo->si_xib_buf = NULL;
- if (err >= 0)
- err = -EIO;
-out_unset:
- fput(sbinfo->si_xib);
- sbinfo->si_xib = NULL;
- sbinfo->si_xread = NULL;
- sbinfo->si_xwrite = NULL;
-out:
- return err;
-}
-
-/* xino for each branch */
-static void xino_clear_br(struct super_block *sb)
-{
- aufs_bindex_t bindex, bbot;
- struct au_branch *br;
-
- bbot = au_sbbot(sb);
- for (bindex = 0; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (!br || !br->br_xino.xi_file)
- continue;
-
- fput(br->br_xino.xi_file);
- br->br_xino.xi_file = NULL;
- }
-}
-
-static int au_xino_set_br(struct super_block *sb, struct file *base)
-{
- int err;
- ino_t ino;
- aufs_bindex_t bindex, bbot, bshared;
- struct {
- struct file *old, *new;
- } *fpair, *p;
- struct au_branch *br;
- struct inode *inode;
- vfs_writef_t writef;
-
- SiMustWriteLock(sb);
-
- err = -ENOMEM;
- bbot = au_sbbot(sb);
- fpair = kcalloc(bbot + 1, sizeof(*fpair), GFP_NOFS);
- if (unlikely(!fpair))
- goto out;
-
- inode = d_inode(sb->s_root);
- ino = AUFS_ROOT_INO;
- writef = au_sbi(sb)->si_xwrite;
- for (bindex = 0, p = fpair; bindex <= bbot; bindex++, p++) {
- bshared = is_sb_shared(sb, bindex, bindex - 1);
- if (bshared >= 0) {
- /* shared xino */
- *p = fpair[bshared];
- get_file(p->new);
- }
-
- if (!p->new) {
- /* new xino */
- br = au_sbr(sb, bindex);
- p->old = br->br_xino.xi_file;
- p->new = au_xino_create2(base, br->br_xino.xi_file);
- err = PTR_ERR(p->new);
- if (IS_ERR(p->new)) {
- p->new = NULL;
- goto out_pair;
- }
- }
-
- err = au_xino_do_write(writef, p->new,
- au_h_iptr(inode, bindex)->i_ino, ino);
- if (unlikely(err))
- goto out_pair;
- }
-
- for (bindex = 0, p = fpair; bindex <= bbot; bindex++, p++) {
- br = au_sbr(sb, bindex);
- if (br->br_xino.xi_file)
- fput(br->br_xino.xi_file);
- get_file(p->new);
- br->br_xino.xi_file = p->new;
- }
-
-out_pair:
- for (bindex = 0, p = fpair; bindex <= bbot; bindex++, p++)
- if (p->new)
- fput(p->new);
- else
- break;
- au_delayed_kfree(fpair);
-out:
- return err;
-}
-
-void au_xino_clr(struct super_block *sb)
-{
- struct au_sbinfo *sbinfo;
-
- au_xigen_clr(sb);
- xino_clear_xib(sb);
- xino_clear_br(sb);
- sbinfo = au_sbi(sb);
- /* lvalue, do not call au_mntflags() */
- au_opt_clr(sbinfo->si_mntflags, XINO);
-}
-
-int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount)
-{
- int err, skip;
- struct dentry *parent, *cur_parent;
- struct qstr *dname, *cur_name;
- struct file *cur_xino;
- struct inode *dir;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- err = 0;
- sbinfo = au_sbi(sb);
- parent = dget_parent(xino->file->f_path.dentry);
- if (remount) {
- skip = 0;
- dname = &xino->file->f_path.dentry->d_name;
- cur_xino = sbinfo->si_xib;
- if (cur_xino) {
- cur_parent = dget_parent(cur_xino->f_path.dentry);
- cur_name = &cur_xino->f_path.dentry->d_name;
- skip = (cur_parent == parent
- && au_qstreq(dname, cur_name));
- dput(cur_parent);
- }
- if (skip)
- goto out;
- }
-
- au_opt_set(sbinfo->si_mntflags, XINO);
- dir = d_inode(parent);
- inode_lock_nested(dir, AuLsc_I_PARENT);
- /* mnt_want_write() is unnecessary here */
- err = au_xino_set_xib(sb, xino->file);
- if (!err)
- err = au_xigen_set(sb, xino->file);
- if (!err)
- err = au_xino_set_br(sb, xino->file);
- inode_unlock(dir);
- if (!err)
- goto out; /* success */
-
- /* reset all */
- AuIOErr("failed creating xino(%d).\n", err);
- au_xigen_clr(sb);
- xino_clear_xib(sb);
-
-out:
- dput(parent);
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/*
- * create a xinofile at the default place/path.
- */
-struct file *au_xino_def(struct super_block *sb)
-{
- struct file *file;
- char *page, *p;
- struct au_branch *br;
- struct super_block *h_sb;
- struct path path;
- aufs_bindex_t bbot, bindex, bwr;
-
- br = NULL;
- bbot = au_sbbot(sb);
- bwr = -1;
- for (bindex = 0; bindex <= bbot; bindex++) {
- br = au_sbr(sb, bindex);
- if (au_br_writable(br->br_perm)
- && !au_test_fs_bad_xino(au_br_sb(br))) {
- bwr = bindex;
- break;
- }
- }
-
- if (bwr >= 0) {
- file = ERR_PTR(-ENOMEM);
- page = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!page))
- goto out;
- path.mnt = au_br_mnt(br);
- path.dentry = au_h_dptr(sb->s_root, bwr);
- p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME));
- file = (void *)p;
- if (!IS_ERR(p)) {
- strcat(p, "/" AUFS_XINO_FNAME);
- AuDbg("%s\n", p);
- file = au_xino_create(sb, p, /*silent*/0);
- if (!IS_ERR(file))
- au_xino_brid_set(sb, br->br_id);
- }
- au_delayed_free_page((unsigned long)page);
- } else {
- file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
- if (IS_ERR(file))
- goto out;
- h_sb = file->f_path.dentry->d_sb;
- if (unlikely(au_test_fs_bad_xino(h_sb))) {
- pr_err("xino doesn't support %s(%s)\n",
- AUFS_XINO_DEFPATH, au_sbtype(h_sb));
- fput(file);
- file = ERR_PTR(-EINVAL);
- }
- if (!IS_ERR(file))
- au_xino_brid_set(sb, -1);
- }
-
-out:
- return file;
-}
-
-/* ---------------------------------------------------------------------- */
-
-int au_xino_path(struct seq_file *seq, struct file *file)
-{
- int err;
-
- err = au_seq_path(seq, &file->f_path);
- if (unlikely(err))
- goto out;
-
-#define Deleted "\\040(deleted)"
- seq->count -= sizeof(Deleted) - 1;
- AuDebugOn(memcmp(seq->buf + seq->count, Deleted,
- sizeof(Deleted) - 1));
-#undef Deleted
-
-out:
- return err;
-}
*
* The @enter() and @finish() callbacks are called with d_lock held.
*/
-void d_walk(struct dentry *parent, void *data,
+static void d_walk(struct dentry *parent, void *data,
enum d_walk_ret (*enter)(void *, struct dentry *),
void (*finish)(void *))
{
seq = 1;
goto again;
}
-EXPORT_SYMBOL_GPL(d_walk);
struct check_mount {
struct vfsmount *mnt;
return (path->mnt->mnt_flags & MNT_NOEXEC) ||
(path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC);
}
-EXPORT_SYMBOL_GPL(path_noexec);
bool path_nosuid(const struct path *path)
{
#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
-int setfl(int fd, struct file * filp, unsigned long arg)
+static int setfl(int fd, struct file * filp, unsigned long arg)
{
struct inode * inode = file_inode(filp);
int error = 0;
if (filp->f_op->check_flags)
error = filp->f_op->check_flags(arg);
- if (!error && filp->f_op->setfl)
- error = filp->f_op->setfl(filp, arg);
if (error)
return error;
out:
return error;
}
-EXPORT_SYMBOL_GPL(setfl);
static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
int force)
}
return ERR_PTR(-ENFILE);
}
-EXPORT_SYMBOL_GPL(get_empty_filp);
/**
* alloc_file - allocate and initialize a 'struct file'
{
delayed_fput(NULL);
}
-EXPORT_SYMBOL_GPL(flush_delayed_fput);
static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput);
}
EXPORT_SYMBOL(fput);
-EXPORT_SYMBOL_GPL(__fput_sync);
void put_filp(struct file *file)
{
file_free(file);
}
}
-EXPORT_SYMBOL_GPL(put_filp);
void __init files_init(void)
{
* This does the actual work of updating an inodes time or version. Must have
* had called mnt_want_write() before calling this.
*/
-int update_time(struct inode *inode, struct timespec *time, int flags)
+static int update_time(struct inode *inode, struct timespec *time, int flags)
{
int (*update_time)(struct inode *, struct timespec *, int);
return update_time(inode, time, flags);
}
-EXPORT_SYMBOL_GPL(update_time);
/**
* touch_atime - update the access time
mnt_dec_writers(real_mount(mnt));
preempt_enable();
}
-EXPORT_SYMBOL_GPL(__mnt_drop_write);
/**
* mnt_drop_write - give up write access to a mount
}
return 0;
}
-EXPORT_SYMBOL_GPL(iterate_mounts);
static void cleanup_group_ids(struct mount *mnt, struct mount *end)
{
#include <linux/srcu.h>
#include <linux/rculist.h>
#include <linux/wait.h>
-#include <linux/module.h>
#include <linux/fsnotify_backend.h>
#include "fsnotify.h"
{
atomic_inc(&group->refcnt);
}
-EXPORT_SYMBOL_GPL(fsnotify_get_group);
/*
* Drop a reference to a group. Free it if it's through.
if (atomic_dec_and_test(&group->refcnt))
fsnotify_final_destroy_group(group);
}
-EXPORT_SYMBOL_GPL(fsnotify_put_group);
/*
* Create a new fsnotify_group and hold a reference for the group returned.
return group;
}
-EXPORT_SYMBOL_GPL(fsnotify_alloc_group);
int fsnotify_fasync(int fd, struct file *file, int on)
{
mark->free_mark(mark);
}
}
-EXPORT_SYMBOL_GPL(fsnotify_put_mark);
/* Calculate mask of events for a list of marks */
u32 fsnotify_recalc_mask(struct hlist_head *head)
mutex_unlock(&group->mark_mutex);
fsnotify_free_mark(mark);
}
-EXPORT_SYMBOL_GPL(fsnotify_destroy_mark);
void fsnotify_destroy_marks(struct hlist_head *head, spinlock_t *lock)
{
return ret;
}
-EXPORT_SYMBOL_GPL(fsnotify_add_mark);
int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
struct inode *inode, struct vfsmount *mnt, int allow_dups)
atomic_set(&mark->refcnt, 1);
mark->free_mark = free_mark;
}
-EXPORT_SYMBOL_GPL(fsnotify_init_mark);
/*
* Destroy all marks in destroy_list, waits for SRCU period to finish before
inode_unlock(dentry->d_inode);
return ret;
}
-EXPORT_SYMBOL_GPL(do_truncate);
long vfs_truncate(const struct path *path, loff_t length)
{
}
return 0;
}
-EXPORT_SYMBOL_GPL(open_check_o_direct);
static int do_dentry_open(struct file *f,
struct inode *inode,
down_read(&mm->mmap_sem);
vma = find_exact_vma(mm, vm_start, vm_end);
if (vma && vma->vm_file) {
- *path = vma_pr_or_file(vma)->f_path;
+ *path = vma->vm_file->f_path;
path_get(path);
rc = 0;
}
file = region->vm_file;
if (file) {
- struct inode *inode;
-
- file = vmr_pr_or_file(region);
- inode = file_inode(file);
+ struct inode *inode = file_inode(region->vm_file);
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
}
const char *name = NULL;
if (file) {
- struct inode *inode;
-
- file = vma_pr_or_file(vma);
- inode = file_inode(file);
+ struct inode *inode = file_inode(vma->vm_file);
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
struct vm_area_struct *vma = v;
struct numa_maps *md = &numa_priv->md;
- struct file *file = vma_pr_or_file(vma);
+ struct file *file = vma->vm_file;
struct mm_struct *mm = vma->vm_mm;
struct mm_walk walk = {
.hugetlb_entry = gather_hugetlb_stats,
file = vma->vm_file;
if (file) {
- struct inode *inode;
-
- file = vma_pr_or_file(vma);
- inode = file_inode(file);
+ struct inode *inode = file_inode(vma->vm_file);
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
}
EXPORT_SYMBOL(__vfs_write);
-vfs_readf_t vfs_readf(struct file *file)
-{
- const struct file_operations *fop = file->f_op;
-
- if (fop->read)
- return fop->read;
- if (fop->read_iter)
- return new_sync_read;
- return ERR_PTR(-ENOSYS);
-}
-EXPORT_SYMBOL_GPL(vfs_readf);
-
-vfs_writef_t vfs_writef(struct file *file)
-{
- const struct file_operations *fop = file->f_op;
-
- if (fop->write)
- return fop->write;
- if (fop->write_iter)
- return new_sync_write;
- return ERR_PTR(-ENOSYS);
-}
-EXPORT_SYMBOL_GPL(vfs_writef);
-
ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
/*
* Attempt to initiate a splice from pipe to file.
*/
-long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags)
+static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+ loff_t *ppos, size_t len, unsigned int flags)
{
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
loff_t *, size_t, unsigned int);
return splice_write(pipe, out, ppos, len, flags);
}
-EXPORT_SYMBOL_GPL(do_splice_from);
/*
* Attempt to initiate a splice from a file to a pipe.
*/
-long do_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
+static long do_splice_to(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
{
ssize_t (*splice_read)(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
return splice_read(in, ppos, pipe, len, flags);
}
-EXPORT_SYMBOL_GPL(do_splice_to);
/**
* splice_direct_to_actor - splices data directly between two non-pipes
*xattr_value = value;
return error;
}
-EXPORT_SYMBOL_GPL(vfs_getxattr_alloc);
ssize_t
__vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name,
struct path;
extern struct file *alloc_file(const struct path *, fmode_t mode,
const struct file_operations *fop);
-extern struct file *get_empty_filp(void);
static inline void fput_light(struct file *file, int fput_needed)
{
/* can be called from interrupts */
extern void kill_fasync(struct fasync_struct **, int, int);
-extern int setfl(int fd, struct file * filp, unsigned long arg);
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
extern void f_setown(struct file *filp, unsigned long arg, int force);
extern void f_delown(struct file *filp);
ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
int (*check_flags)(int);
- int (*setfl)(struct file *, unsigned long);
int (*flock) (struct file *, int, struct file_lock *);
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
struct iovec *fast_pointer,
struct iovec **ret_pointer);
-typedef ssize_t (*vfs_readf_t)(struct file *, char __user *, size_t, loff_t *);
-typedef ssize_t (*vfs_writef_t)(struct file *, const char __user *, size_t,
- loff_t *);
-vfs_readf_t vfs_readf(struct file *file);
-vfs_writef_t vfs_writef(struct file *file);
-
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern void ihold(struct inode * inode);
extern void iput(struct inode *);
extern int generic_update_time(struct inode *, struct timespec *, int);
-extern int update_time(struct inode *, struct timespec *, int);
/* /sys/fs */
extern struct kobject *fs_kobj;
}
#endif
-extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int);
-extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[],
- int);
-extern void vma_do_get_file(struct vm_area_struct *, const char[], int);
-extern void vma_do_fput(struct vm_area_struct *, const char[], int);
-
-#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \
- __LINE__)
-#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \
- __LINE__)
-#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__)
-#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__)
-
-#ifndef CONFIG_MMU
-extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int);
-extern void vmr_do_fput(struct vm_region *, const char[], int);
-
-#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \
- __LINE__)
-#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__)
-#endif /* !CONFIG_MMU */
-
extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len,
unsigned int gup_flags);
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
unsigned long vm_top; /* region allocated to here */
unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
struct file *vm_file; /* the backing file or NULL */
- struct file *vm_prfile; /* the virtual backing file or NULL */
int vm_usage; /* region usage count (access under nommu_region_sem) */
bool vm_icache_flushed : 1; /* true if the icache has been flushed for
unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
units */
struct file * vm_file; /* File we map to (can be NULL). */
- struct file *vm_prfile; /* shadow of vm_file */
void * vm_private_data; /* was vm_pte (shared mem) */
#ifndef CONFIG_MMU
extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
extern const struct pipe_buf_operations default_pipe_buf_ops;
-
-extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
- loff_t *ppos, size_t len, unsigned int flags);
-extern long do_splice_to(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags);
#endif
header-y += atm_tcp.h
header-y += atm_zatm.h
header-y += audit.h
-header-y += aufs_type.h
header-y += auto_fs4.h
header-y += auto_fs.h
header-y += auxvec.h
+++ /dev/null
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __AUFS_TYPE_H__
-#define __AUFS_TYPE_H__
-
-#define AUFS_NAME "aufs"
-
-#ifdef __KERNEL__
-/*
- * define it before including all other headers.
- * sched.h may use pr_* macros before defining "current", so define the
- * no-current version first, and re-define later.
- */
-#define pr_fmt(fmt) AUFS_NAME " %s:%d: " fmt, __func__, __LINE__
-#include <linux/sched.h>
-#undef pr_fmt
-#define pr_fmt(fmt) \
- AUFS_NAME " %s:%d:%.*s[%d]: " fmt, __func__, __LINE__, \
- (int)sizeof(current->comm), current->comm, current->pid
-#else
-#include <stdint.h>
-#include <sys/types.h>
-#endif /* __KERNEL__ */
-
-#include <linux/limits.h>
-
-#define AUFS_VERSION "4.x-rcN-20161010"
-
-/* todo? move this to linux-2.6.19/include/magic.h */
-#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_BRANCH_MAX_127
-typedef int8_t aufs_bindex_t;
-#define AUFS_BRANCH_MAX 127
-#else
-typedef int16_t aufs_bindex_t;
-#ifdef CONFIG_AUFS_BRANCH_MAX_511
-#define AUFS_BRANCH_MAX 511
-#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
-#define AUFS_BRANCH_MAX 1023
-#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
-#define AUFS_BRANCH_MAX 32767
-#endif
-#endif
-
-#ifdef __KERNEL__
-#ifndef AUFS_BRANCH_MAX
-#error unknown CONFIG_AUFS_BRANCH_MAX value
-#endif
-#endif /* __KERNEL__ */
-
-/* ---------------------------------------------------------------------- */
-
-#define AUFS_FSTYPE AUFS_NAME
-
-#define AUFS_ROOT_INO 2
-#define AUFS_FIRST_INO 11
-
-#define AUFS_WH_PFX ".wh."
-#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1)
-#define AUFS_WH_TMP_LEN 4
-/* a limit for rmdir/rename a dir and copyup */
-#define AUFS_MAX_NAMELEN (NAME_MAX \
- - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\
- - 1 /* dot */\
- - AUFS_WH_TMP_LEN) /* hex */
-#define AUFS_XINO_FNAME "." AUFS_NAME ".xino"
-#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME
-#define AUFS_XINO_DEF_SEC 30 /* seconds */
-#define AUFS_XINO_DEF_TRUNC 45 /* percentage */
-#define AUFS_DIRWH_DEF 3
-#define AUFS_RDCACHE_DEF 10 /* seconds */
-#define AUFS_RDCACHE_MAX 3600 /* seconds */
-#define AUFS_RDBLK_DEF 512 /* bytes */
-#define AUFS_RDHASH_DEF 32
-#define AUFS_WKQ_NAME AUFS_NAME "d"
-#define AUFS_MFS_DEF_SEC 30 /* seconds */
-#define AUFS_MFS_MAX_SEC 3600 /* seconds */
-#define AUFS_FHSM_CACHE_DEF_SEC 30 /* seconds */
-#define AUFS_PLINK_WARN 50 /* number of plinks in a single bucket */
-
-/* pseudo-link maintenace under /proc */
-#define AUFS_PLINK_MAINT_NAME "plink_maint"
-#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME
-#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME
-
-#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */
-#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME
-
-#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME
-#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk"
-#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph"
-
-/* doubly whiteouted */
-#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME
-#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME
-#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME
-
-/* branch permissions and attributes */
-#define AUFS_BRPERM_RW "rw"
-#define AUFS_BRPERM_RO "ro"
-#define AUFS_BRPERM_RR "rr"
-#define AUFS_BRATTR_COO_REG "coo_reg"
-#define AUFS_BRATTR_COO_ALL "coo_all"
-#define AUFS_BRATTR_FHSM "fhsm"
-#define AUFS_BRATTR_UNPIN "unpin"
-#define AUFS_BRATTR_ICEX "icex"
-#define AUFS_BRATTR_ICEX_SEC "icexsec"
-#define AUFS_BRATTR_ICEX_SYS "icexsys"
-#define AUFS_BRATTR_ICEX_TR "icextr"
-#define AUFS_BRATTR_ICEX_USR "icexusr"
-#define AUFS_BRATTR_ICEX_OTH "icexoth"
-#define AUFS_BRRATTR_WH "wh"
-#define AUFS_BRWATTR_NLWH "nolwh"
-#define AUFS_BRWATTR_MOO "moo"
-
-#define AuBrPerm_RW 1 /* writable, hardlinkable wh */
-#define AuBrPerm_RO (1 << 1) /* readonly */
-#define AuBrPerm_RR (1 << 2) /* natively readonly */
-#define AuBrPerm_Mask (AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR)
-
-#define AuBrAttr_COO_REG (1 << 3) /* copy-up on open */
-#define AuBrAttr_COO_ALL (1 << 4)
-#define AuBrAttr_COO_Mask (AuBrAttr_COO_REG | AuBrAttr_COO_ALL)
-
-#define AuBrAttr_FHSM (1 << 5) /* file-based hsm */
-#define AuBrAttr_UNPIN (1 << 6) /* rename-able top dir of
- branch. meaningless since
- linux-3.18-rc1 */
-
-/* ignore error in copying XATTR */
-#define AuBrAttr_ICEX_SEC (1 << 7)
-#define AuBrAttr_ICEX_SYS (1 << 8)
-#define AuBrAttr_ICEX_TR (1 << 9)
-#define AuBrAttr_ICEX_USR (1 << 10)
-#define AuBrAttr_ICEX_OTH (1 << 11)
-#define AuBrAttr_ICEX (AuBrAttr_ICEX_SEC \
- | AuBrAttr_ICEX_SYS \
- | AuBrAttr_ICEX_TR \
- | AuBrAttr_ICEX_USR \
- | AuBrAttr_ICEX_OTH)
-
-#define AuBrRAttr_WH (1 << 12) /* whiteout-able */
-#define AuBrRAttr_Mask AuBrRAttr_WH
-
-#define AuBrWAttr_NoLinkWH (1 << 13) /* un-hardlinkable whiteouts */
-#define AuBrWAttr_MOO (1 << 14) /* move-up on open */
-#define AuBrWAttr_Mask (AuBrWAttr_NoLinkWH | AuBrWAttr_MOO)
-
-#define AuBrAttr_CMOO_Mask (AuBrAttr_COO_Mask | AuBrWAttr_MOO)
-
-/* #warning test userspace */
-#ifdef __KERNEL__
-#ifndef CONFIG_AUFS_FHSM
-#undef AuBrAttr_FHSM
-#define AuBrAttr_FHSM 0
-#endif
-#ifndef CONFIG_AUFS_XATTR
-#undef AuBrAttr_ICEX
-#define AuBrAttr_ICEX 0
-#undef AuBrAttr_ICEX_SEC
-#define AuBrAttr_ICEX_SEC 0
-#undef AuBrAttr_ICEX_SYS
-#define AuBrAttr_ICEX_SYS 0
-#undef AuBrAttr_ICEX_TR
-#define AuBrAttr_ICEX_TR 0
-#undef AuBrAttr_ICEX_USR
-#define AuBrAttr_ICEX_USR 0
-#undef AuBrAttr_ICEX_OTH
-#define AuBrAttr_ICEX_OTH 0
-#endif
-#endif
-
-/* the longest combination */
-/* AUFS_BRATTR_ICEX and AUFS_BRATTR_ICEX_TR don't affect here */
-#define AuBrPermStrSz sizeof(AUFS_BRPERM_RW \
- "+" AUFS_BRATTR_COO_REG \
- "+" AUFS_BRATTR_FHSM \
- "+" AUFS_BRATTR_UNPIN \
- "+" AUFS_BRATTR_ICEX_SEC \
- "+" AUFS_BRATTR_ICEX_SYS \
- "+" AUFS_BRATTR_ICEX_USR \
- "+" AUFS_BRATTR_ICEX_OTH \
- "+" AUFS_BRWATTR_NLWH)
-
-typedef struct {
- char a[AuBrPermStrSz];
-} au_br_perm_str_t;
-
-static inline int au_br_writable(int brperm)
-{
- return brperm & AuBrPerm_RW;
-}
-
-static inline int au_br_whable(int brperm)
-{
- return brperm & (AuBrPerm_RW | AuBrRAttr_WH);
-}
-
-static inline int au_br_wh_linkable(int brperm)
-{
- return !(brperm & AuBrWAttr_NoLinkWH);
-}
-
-static inline int au_br_cmoo(int brperm)
-{
- return brperm & AuBrAttr_CMOO_Mask;
-}
-
-static inline int au_br_fhsm(int brperm)
-{
- return brperm & AuBrAttr_FHSM;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* ioctl */
-enum {
- /* readdir in userspace */
- AuCtl_RDU,
- AuCtl_RDU_INO,
-
- AuCtl_WBR_FD, /* pathconf wrapper */
- AuCtl_IBUSY, /* busy inode */
- AuCtl_MVDOWN, /* move-down */
- AuCtl_BR, /* info about branches */
- AuCtl_FHSM_FD /* connection for fhsm */
-};
-
-/* borrowed from linux/include/linux/kernel.h */
-#ifndef ALIGN
-#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
-#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
-#endif
-
-/* borrowed from linux/include/linux/compiler-gcc3.h */
-#ifndef __aligned
-#define __aligned(x) __attribute__((aligned(x)))
-#endif
-
-#ifdef __KERNEL__
-#ifndef __packed
-#define __packed __attribute__((packed))
-#endif
-#endif
-
-struct au_rdu_cookie {
- uint64_t h_pos;
- int16_t bindex;
- uint8_t flags;
- uint8_t pad;
- uint32_t generation;
-} __aligned(8);
-
-struct au_rdu_ent {
- uint64_t ino;
- int16_t bindex;
- uint8_t type;
- uint8_t nlen;
- uint8_t wh;
- char name[0];
-} __aligned(8);
-
-static inline int au_rdu_len(int nlen)
-{
- /* include the terminating NULL */
- return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
- sizeof(uint64_t));
-}
-
-union au_rdu_ent_ul {
- struct au_rdu_ent __user *e;
- uint64_t ul;
-};
-
-enum {
- AufsCtlRduV_SZ,
- AufsCtlRduV_End
-};
-
-struct aufs_rdu {
- /* input */
- union {
- uint64_t sz; /* AuCtl_RDU */
- uint64_t nent; /* AuCtl_RDU_INO */
- };
- union au_rdu_ent_ul ent;
- uint16_t verify[AufsCtlRduV_End];
-
- /* input/output */
- uint32_t blk;
-
- /* output */
- union au_rdu_ent_ul tail;
- /* number of entries which were added in a single call */
- uint64_t rent;
- uint8_t full;
- uint8_t shwh;
-
- struct au_rdu_cookie cookie;
-} __aligned(8);
-
-/* ---------------------------------------------------------------------- */
-
-struct aufs_wbr_fd {
- uint32_t oflags;
- int16_t brid;
-} __aligned(8);
-
-/* ---------------------------------------------------------------------- */
-
-struct aufs_ibusy {
- uint64_t ino, h_ino;
- int16_t bindex;
-} __aligned(8);
-
-/* ---------------------------------------------------------------------- */
-
-/* error code for move-down */
-/* the actual message strings are implemented in aufs-util.git */
-enum {
- EAU_MVDOWN_OPAQUE = 1,
- EAU_MVDOWN_WHITEOUT,
- EAU_MVDOWN_UPPER,
- EAU_MVDOWN_BOTTOM,
- EAU_MVDOWN_NOUPPER,
- EAU_MVDOWN_NOLOWERBR,
- EAU_Last
-};
-
-/* flags for move-down */
-#define AUFS_MVDOWN_DMSG 1
-#define AUFS_MVDOWN_OWLOWER (1 << 1) /* overwrite lower */
-#define AUFS_MVDOWN_KUPPER (1 << 2) /* keep upper */
-#define AUFS_MVDOWN_ROLOWER (1 << 3) /* do even if lower is RO */
-#define AUFS_MVDOWN_ROLOWER_R (1 << 4) /* did on lower RO */
-#define AUFS_MVDOWN_ROUPPER (1 << 5) /* do even if upper is RO */
-#define AUFS_MVDOWN_ROUPPER_R (1 << 6) /* did on upper RO */
-#define AUFS_MVDOWN_BRID_UPPER (1 << 7) /* upper brid */
-#define AUFS_MVDOWN_BRID_LOWER (1 << 8) /* lower brid */
-#define AUFS_MVDOWN_FHSM_LOWER (1 << 9) /* find fhsm attr for lower */
-#define AUFS_MVDOWN_STFS (1 << 10) /* req. stfs */
-#define AUFS_MVDOWN_STFS_FAILED (1 << 11) /* output: stfs is unusable */
-#define AUFS_MVDOWN_BOTTOM (1 << 12) /* output: no more lowers */
-
-/* index for move-down */
-enum {
- AUFS_MVDOWN_UPPER,
- AUFS_MVDOWN_LOWER,
- AUFS_MVDOWN_NARRAY
-};
-
-/*
- * additional info of move-down
- * number of free blocks and inodes.
- * subset of struct kstatfs, but smaller and always 64bit.
- */
-struct aufs_stfs {
- uint64_t f_blocks;
- uint64_t f_bavail;
- uint64_t f_files;
- uint64_t f_ffree;
-};
-
-struct aufs_stbr {
- int16_t brid; /* optional input */
- int16_t bindex; /* output */
- struct aufs_stfs stfs; /* output when AUFS_MVDOWN_STFS set */
-} __aligned(8);
-
-struct aufs_mvdown {
- uint32_t flags; /* input/output */
- struct aufs_stbr stbr[AUFS_MVDOWN_NARRAY]; /* input/output */
- int8_t au_errno; /* output */
-} __aligned(8);
-
-/* ---------------------------------------------------------------------- */
-
-union aufs_brinfo {
- /* PATH_MAX may differ between kernel-space and user-space */
- char _spacer[4096];
- struct {
- int16_t id;
- int perm;
- char path[0];
- };
-} __aligned(8);
-
-/* ---------------------------------------------------------------------- */
-
-#define AuCtlType 'A'
-#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
-#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
-#define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \
- struct aufs_wbr_fd)
-#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy)
-#define AUFS_CTL_MVDOWN _IOWR(AuCtlType, AuCtl_MVDOWN, \
- struct aufs_mvdown)
-#define AUFS_CTL_BRINFO _IOW(AuCtlType, AuCtl_BR, union aufs_brinfo)
-#define AUFS_CTL_FHSM_FD _IOW(AuCtlType, AuCtl_FHSM_FD, int)
-
-#endif /* __AUFS_TYPE_H__ */
struct inode *inode = file_inode(file);
struct address_space *mapping = file->f_mapping;
- vma_get_file(tmp);
+ get_file(file);
if (tmp->vm_flags & VM_DENYWRITE)
atomic_dec(&inode->i_writecount);
i_mmap_lock_write(mapping);
} while (work);
}
}
-EXPORT_SYMBOL_GPL(task_work_run);
mm_init.o mmu_context.o percpu.o slab_common.o \
compaction.o vmacache.o \
interval_tree.o list_lru.o workingset.o \
- prfile.o debug.o $(mmu-y)
+ debug.o $(mmu-y)
obj-y += init-mm.o
int ret = VM_FAULT_LOCKED;
sb_start_pagefault(inode->i_sb);
- vma_file_update_time(vma);
+ file_update_time(vma->vm_file);
lock_page(page);
if (page->mapping != inode->i_mapping) {
unlock_page(page);
}
if (!page_mkwrite)
- vma_file_update_time(vma);
+ file_update_time(vma->vm_file);
}
/*
if (vma->vm_ops && vma->vm_ops->close)
vma->vm_ops->close(vma);
if (vma->vm_file)
- vma_fput(vma);
+ fput(vma->vm_file);
mpol_put(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
return next;
if (remove_next) {
if (file) {
uprobe_munmap(next, next->vm_start, next->vm_end);
- vma_fput(vma);
+ fput(file);
}
if (next->anon_vma)
anon_vma_merge(vma, next);
return addr;
unmap_and_free_vma:
- vma_fput(vma);
vma->vm_file = NULL;
+ fput(file);
/* Undo any partial mapping done by a device driver. */
unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
goto out_free_mpol;
if (new->vm_file)
- vma_get_file(new);
+ get_file(new->vm_file);
if (new->vm_ops && new->vm_ops->open)
new->vm_ops->open(new);
if (new->vm_ops && new->vm_ops->close)
new->vm_ops->close(new);
if (new->vm_file)
- vma_fput(new);
+ fput(new->vm_file);
unlink_anon_vmas(new);
out_free_mpol:
mpol_put(vma_policy(new));
struct vm_area_struct *vma;
unsigned long populate = 0;
unsigned long ret = -EINVAL;
- struct file *file, *prfile;
+ struct file *file;
pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.\n",
current->comm, current->pid);
}
}
- vma_get_file(vma);
- file = vma->vm_file;
- prfile = vma->vm_prfile;
+ file = get_file(vma->vm_file);
ret = do_mmap_pgoff(vma->vm_file, start, size,
prot, flags, pgoff, &populate);
- if (!IS_ERR_VALUE(ret) && file && prfile) {
- struct vm_area_struct *new_vma;
-
- new_vma = find_vma(mm, ret);
- if (!new_vma->vm_prfile)
- new_vma->vm_prfile = prfile;
- if (new_vma != vma)
- get_file(prfile);
- }
- /*
- * two fput()s instead of vma_fput(vma),
- * coz vma may not be available anymore.
- */
fput(file);
- if (prfile)
- fput(prfile);
out:
up_write(&mm->mmap_sem);
if (populate)
if (anon_vma_clone(new_vma, vma))
goto out_free_mempol;
if (new_vma->vm_file)
- vma_get_file(new_vma);
+ get_file(new_vma->vm_file);
if (new_vma->vm_ops && new_vma->vm_ops->open)
new_vma->vm_ops->open(new_vma);
vma_link(mm, new_vma, prev, rb_link, rb_parent);
up_write(&nommu_region_sem);
if (region->vm_file)
- vmr_fput(region);
+ fput(region->vm_file);
/* IO memory and memory shared directly out of the pagecache
* from ramfs/tmpfs mustn't be released here */
if (vma->vm_ops && vma->vm_ops->close)
vma->vm_ops->close(vma);
if (vma->vm_file)
- vma_fput(vma);
+ fput(vma->vm_file);
put_nommu_region(vma->vm_region);
kmem_cache_free(vm_area_cachep, vma);
}
goto error_just_free;
}
}
- vmr_fput(region);
+ fput(region->vm_file);
kmem_cache_free(vm_region_jar, region);
region = pregion;
result = start;
up_write(&nommu_region_sem);
error:
if (region->vm_file)
- vmr_fput(region);
+ fput(region->vm_file);
kmem_cache_free(vm_region_jar, region);
if (vma->vm_file)
- vma_fput(vma);
+ fput(vma->vm_file);
kmem_cache_free(vm_area_cachep, vma);
return ret;
+++ /dev/null
-/*
- * Mainly for aufs which mmap(2) diffrent file and wants to print different path
- * in /proc/PID/maps.
- * Call these functions via macros defined in linux/mm.h.
- *
- * See Documentation/filesystems/aufs/design/06mmap.txt
- *
- * Copyright (c) 2014 Junjro R. Okajima
- * Copyright (c) 2014 Ian Campbell
- */
-
-#include <linux/mm.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-
-/* #define PRFILE_TRACE */
-static inline void prfile_trace(struct file *f, struct file *pr,
- const char func[], int line, const char func2[])
-{
-#ifdef PRFILE_TRACE
- if (pr)
- pr_info("%s:%d: %s, %s\n", func, line, func2,
- f ? (char *)f->f_path.dentry->d_name.name : "(null)");
-#endif
-}
-
-void vma_do_file_update_time(struct vm_area_struct *vma, const char func[],
- int line)
-{
- struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- file_update_time(f);
- if (f && pr)
- file_update_time(pr);
-}
-
-struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[],
- int line)
-{
- struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- return (f && pr) ? pr : f;
-}
-
-void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line)
-{
- struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- get_file(f);
- if (f && pr)
- get_file(pr);
-}
-
-void vma_do_fput(struct vm_area_struct *vma, const char func[], int line)
-{
- struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- fput(f);
- if (f && pr)
- fput(pr);
-}
-
-#ifndef CONFIG_MMU
-struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[],
- int line)
-{
- struct file *f = region->vm_file, *pr = region->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- return (f && pr) ? pr : f;
-}
-
-void vmr_do_fput(struct vm_region *region, const char func[], int line)
-{
- struct file *f = region->vm_file, *pr = region->vm_prfile;
-
- prfile_trace(f, pr, func, line, __func__);
- fput(f);
- if (f && pr)
- fput(pr);
-}
-#endif /* !CONFIG_MMU */
}
return ret;
}
-EXPORT_SYMBOL_GPL(cap_mmap_addr);
int cap_mmap_file(struct file *file, unsigned long reqprot,
unsigned long prot, unsigned long flags)
{
return 0;
}
-EXPORT_SYMBOL_GPL(cap_mmap_file);
#ifdef CONFIG_SECURITY
#include <linux/device_cgroup.h>
#include <linux/cgroup.h>
#include <linux/ctype.h>
-#include <linux/export.h>
#include <linux/list.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>
return __devcgroup_check_permission(type, imajor(inode), iminor(inode),
access);
}
-EXPORT_SYMBOL_GPL(__devcgroup_inode_permission);
int devcgroup_inode_mknod(int mode, dev_t dev)
{
return 0;
return call_int_hook(path_rmdir, 0, dir, dentry);
}
-EXPORT_SYMBOL_GPL(security_path_rmdir);
int security_path_unlink(const struct path *dir, struct dentry *dentry)
{
return 0;
return call_int_hook(path_symlink, 0, dir, dentry, old_name);
}
-EXPORT_SYMBOL_GPL(security_path_symlink);
int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
struct dentry *new_dentry)
return 0;
return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
}
-EXPORT_SYMBOL_GPL(security_path_link);
int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
const struct path *new_dir, struct dentry *new_dentry,
return 0;
return call_int_hook(path_truncate, 0, path);
}
-EXPORT_SYMBOL_GPL(security_path_truncate);
int security_path_chmod(const struct path *path, umode_t mode)
{
return 0;
return call_int_hook(path_chmod, 0, path, mode);
}
-EXPORT_SYMBOL_GPL(security_path_chmod);
int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
return 0;
return call_int_hook(path_chown, 0, path, uid, gid);
}
-EXPORT_SYMBOL_GPL(security_path_chown);
int security_path_chroot(const struct path *path)
{
return 0;
return call_int_hook(inode_readlink, 0, dentry);
}
-EXPORT_SYMBOL_GPL(security_inode_readlink);
int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
bool rcu)
return 0;
return call_int_hook(inode_permission, 0, inode, mask);
}
-EXPORT_SYMBOL_GPL(security_inode_permission);
int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
{
return fsnotify_perm(file, mask);
}
-EXPORT_SYMBOL_GPL(security_file_permission);
int security_file_alloc(struct file *file)
{
return ret;
return ima_file_mmap(file, prot);
}
-EXPORT_SYMBOL_GPL(security_mmap_file);
int security_mmap_addr(unsigned long addr)
{
projects / mirror_ubuntu-zesty-kernel.git / commitdiff