2 * linux/fs/9p/vfs_inode.c
4 * This file contains vfs inode ops for the 9P2000 protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
50 static const struct inode_operations v9fs_dir_inode_operations
;
51 static const struct inode_operations v9fs_dir_inode_operations_dotu
;
52 static const struct inode_operations v9fs_file_inode_operations
;
53 static const struct inode_operations v9fs_symlink_inode_operations
;
56 * unixmode2p9mode - convert unix mode bits to plan 9
57 * @v9ses: v9fs session information
58 * @mode: mode to convert
62 static int unixmode2p9mode(struct v9fs_session_info
*v9ses
, int mode
)
68 if (v9fs_proto_dotu(v9ses
)) {
71 if (v9ses
->nodev
== 0) {
75 res
|= P9_DMNAMEDPIPE
;
82 if ((mode
& S_ISUID
) == S_ISUID
)
84 if ((mode
& S_ISGID
) == S_ISGID
)
86 if ((mode
& S_ISVTX
) == S_ISVTX
)
88 if ((mode
& P9_DMLINK
))
96 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
97 * @v9ses: v9fs session information
98 * @mode: mode to convert
102 static int p9mode2unixmode(struct v9fs_session_info
*v9ses
, int mode
)
108 if ((mode
& P9_DMDIR
) == P9_DMDIR
)
110 else if ((mode
& P9_DMSYMLINK
) && (v9fs_proto_dotu(v9ses
)))
112 else if ((mode
& P9_DMSOCKET
) && (v9fs_proto_dotu(v9ses
))
113 && (v9ses
->nodev
== 0))
115 else if ((mode
& P9_DMNAMEDPIPE
) && (v9fs_proto_dotu(v9ses
))
116 && (v9ses
->nodev
== 0))
118 else if ((mode
& P9_DMDEVICE
) && (v9fs_proto_dotu(v9ses
))
119 && (v9ses
->nodev
== 0))
124 if (v9fs_proto_dotu(v9ses
)) {
125 if ((mode
& P9_DMSETUID
) == P9_DMSETUID
)
128 if ((mode
& P9_DMSETGID
) == P9_DMSETGID
)
131 if ((mode
& P9_DMSETVTX
) == P9_DMSETVTX
)
139 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
140 * @uflags: flags to convert
141 * @extended: if .u extensions are active
144 int v9fs_uflags2omode(int uflags
, int extended
)
164 if (uflags
& O_TRUNC
)
171 if (uflags
& O_APPEND
)
179 * v9fs_blank_wstat - helper function to setup a 9P stat structure
180 * @wstat: structure to initialize
185 v9fs_blank_wstat(struct p9_wstat
*wstat
)
189 wstat
->qid
.type
= ~0;
190 wstat
->qid
.version
= ~0;
191 *((long long *)&wstat
->qid
.path
) = ~0;
203 wstat
->extension
= NULL
;
207 * v9fs_alloc_inode - helper function to allocate an inode
210 struct inode
*v9fs_alloc_inode(struct super_block
*sb
)
212 struct v9fs_inode
*v9inode
;
213 v9inode
= (struct v9fs_inode
*)kmem_cache_alloc(v9fs_inode_cache
,
217 #ifdef CONFIG_9P_FSCACHE
218 v9inode
->fscache
= NULL
;
219 v9inode
->fscache_key
= NULL
;
220 spin_lock_init(&v9inode
->fscache_lock
);
222 v9inode
->writeback_fid
= NULL
;
223 v9inode
->cache_validity
= 0;
224 return &v9inode
->vfs_inode
;
228 * v9fs_destroy_inode - destroy an inode
232 static void v9fs_i_callback(struct rcu_head
*head
)
234 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
235 INIT_LIST_HEAD(&inode
->i_dentry
);
236 kmem_cache_free(v9fs_inode_cache
, V9FS_I(inode
));
239 void v9fs_destroy_inode(struct inode
*inode
)
241 call_rcu(&inode
->i_rcu
, v9fs_i_callback
);
244 int v9fs_init_inode(struct v9fs_session_info
*v9ses
,
245 struct inode
*inode
, int mode
)
249 inode_init_owner(inode
, NULL
, mode
);
252 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
253 inode
->i_mapping
->a_ops
= &v9fs_addr_operations
;
255 switch (mode
& S_IFMT
) {
260 if (v9fs_proto_dotl(v9ses
)) {
261 inode
->i_op
= &v9fs_file_inode_operations_dotl
;
262 inode
->i_fop
= &v9fs_file_operations_dotl
;
263 } else if (v9fs_proto_dotu(v9ses
)) {
264 inode
->i_op
= &v9fs_file_inode_operations
;
265 inode
->i_fop
= &v9fs_file_operations
;
267 P9_DPRINTK(P9_DEBUG_ERROR
,
268 "special files without extended mode\n");
272 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
275 if (v9fs_proto_dotl(v9ses
)) {
276 inode
->i_op
= &v9fs_file_inode_operations_dotl
;
279 &v9fs_cached_file_operations_dotl
;
281 inode
->i_fop
= &v9fs_file_operations_dotl
;
283 inode
->i_op
= &v9fs_file_inode_operations
;
285 inode
->i_fop
= &v9fs_cached_file_operations
;
287 inode
->i_fop
= &v9fs_file_operations
;
292 if (!v9fs_proto_dotu(v9ses
) && !v9fs_proto_dotl(v9ses
)) {
293 P9_DPRINTK(P9_DEBUG_ERROR
, "extended modes used with "
294 "legacy protocol.\n");
299 if (v9fs_proto_dotl(v9ses
))
300 inode
->i_op
= &v9fs_symlink_inode_operations_dotl
;
302 inode
->i_op
= &v9fs_symlink_inode_operations
;
307 if (v9fs_proto_dotl(v9ses
))
308 inode
->i_op
= &v9fs_dir_inode_operations_dotl
;
309 else if (v9fs_proto_dotu(v9ses
))
310 inode
->i_op
= &v9fs_dir_inode_operations_dotu
;
312 inode
->i_op
= &v9fs_dir_inode_operations
;
314 if (v9fs_proto_dotl(v9ses
))
315 inode
->i_fop
= &v9fs_dir_operations_dotl
;
317 inode
->i_fop
= &v9fs_dir_operations
;
321 P9_DPRINTK(P9_DEBUG_ERROR
, "BAD mode 0x%x S_IFMT 0x%x\n",
322 mode
, mode
& S_IFMT
);
332 * v9fs_get_inode - helper function to setup an inode
334 * @mode: mode to setup inode with
338 struct inode
*v9fs_get_inode(struct super_block
*sb
, int mode
)
342 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
344 P9_DPRINTK(P9_DEBUG_VFS
, "super block: %p mode: %o\n", sb
, mode
);
346 inode
= new_inode(sb
);
348 P9_EPRINTK(KERN_WARNING
, "Problem allocating inode\n");
349 return ERR_PTR(-ENOMEM
);
351 err
= v9fs_init_inode(v9ses
, inode
, mode
);
360 static struct v9fs_fid*
361 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
365 struct v9fs_fid *ret;
366 struct v9fs_fcall *fcall;
368 nfid = v9fs_get_idpool(&v9ses->fidpool);
370 eprintk(KERN_WARNING, "no free fids available\n");
371 return ERR_PTR(-ENOSPC);
374 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
378 if (fcall && fcall->id == RWALK)
381 PRINT_FCALL_ERROR("walk error", fcall);
382 v9fs_put_idpool(nfid, &v9ses->fidpool);
388 ret = v9fs_fid_create(v9ses, nfid);
394 err = v9fs_fid_insert(ret, dentry);
396 v9fs_fid_destroy(ret);
403 v9fs_t_clunk(v9ses, nfid);
413 * v9fs_clear_inode - release an inode
414 * @inode: inode to release
417 void v9fs_evict_inode(struct inode
*inode
)
419 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
421 truncate_inode_pages(inode
->i_mapping
, 0);
422 end_writeback(inode
);
423 filemap_fdatawrite(inode
->i_mapping
);
425 #ifdef CONFIG_9P_FSCACHE
426 v9fs_cache_inode_put_cookie(inode
);
428 /* clunk the fid stashed in writeback_fid */
429 if (v9inode
->writeback_fid
) {
430 p9_client_clunk(v9inode
->writeback_fid
);
431 v9inode
->writeback_fid
= NULL
;
435 static struct inode
*v9fs_qid_iget(struct super_block
*sb
,
442 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
444 i_ino
= v9fs_qid2ino(qid
);
445 inode
= iget_locked(sb
, i_ino
);
447 return ERR_PTR(-ENOMEM
);
448 if (!(inode
->i_state
& I_NEW
))
451 * initialize the inode with the stat info
452 * FIXME!! we may need support for stale inodes
455 umode
= p9mode2unixmode(v9ses
, st
->mode
);
456 retval
= v9fs_init_inode(v9ses
, inode
, umode
);
460 v9fs_stat2inode(st
, inode
, sb
);
461 #ifdef CONFIG_9P_FSCACHE
462 v9fs_fscache_set_key(inode
, &st
->qid
);
463 v9fs_cache_inode_get_cookie(inode
);
465 unlock_new_inode(inode
);
468 unlock_new_inode(inode
);
470 return ERR_PTR(retval
);
475 v9fs_inode_from_fid(struct v9fs_session_info
*v9ses
, struct p9_fid
*fid
,
476 struct super_block
*sb
)
479 struct inode
*inode
= NULL
;
481 st
= p9_client_stat(fid
);
485 inode
= v9fs_qid_iget(sb
, &st
->qid
, st
);
492 * v9fs_remove - helper function to remove files and directories
493 * @dir: directory inode that is being deleted
494 * @file: dentry that is being deleted
495 * @rmdir: removing a directory
499 static int v9fs_remove(struct inode
*dir
, struct dentry
*file
, int rmdir
)
502 struct p9_fid
*v9fid
;
503 struct inode
*file_inode
;
505 P9_DPRINTK(P9_DEBUG_VFS
, "inode: %p dentry: %p rmdir: %d\n", dir
, file
,
508 file_inode
= file
->d_inode
;
509 v9fid
= v9fs_fid_clone(file
);
511 return PTR_ERR(v9fid
);
513 retval
= p9_client_remove(v9fid
);
516 * directories on unlink should have zero
520 clear_nlink(file_inode
);
523 drop_nlink(file_inode
);
525 v9fs_invalidate_inode_attr(file_inode
);
526 v9fs_invalidate_inode_attr(dir
);
532 * v9fs_create - Create a file
533 * @v9ses: session information
534 * @dir: directory that dentry is being created in
535 * @dentry: dentry that is being created
536 * @extension: 9p2000.u extension string to support devices, etc.
537 * @perm: create permissions
541 static struct p9_fid
*
542 v9fs_create(struct v9fs_session_info
*v9ses
, struct inode
*dir
,
543 struct dentry
*dentry
, char *extension
, u32 perm
, u8 mode
)
547 struct p9_fid
*dfid
, *ofid
, *fid
;
550 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
555 name
= (char *) dentry
->d_name
.name
;
556 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
559 P9_DPRINTK(P9_DEBUG_VFS
, "fid lookup failed %d\n", err
);
563 /* clone a fid to use for creation */
564 ofid
= p9_client_walk(dfid
, 0, NULL
, 1);
567 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
571 err
= p9_client_fcreate(ofid
, name
, perm
, mode
, extension
);
573 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_fcreate failed %d\n", err
);
577 /* now walk from the parent so we can get unopened fid */
578 fid
= p9_client_walk(dfid
, 1, &name
, 1);
581 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
586 /* instantiate inode and assign the unopened fid to the dentry */
587 inode
= v9fs_get_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
589 err
= PTR_ERR(inode
);
590 P9_DPRINTK(P9_DEBUG_VFS
, "inode creation failed %d\n", err
);
593 d_instantiate(dentry
, inode
);
594 err
= v9fs_fid_add(dentry
, fid
);
602 p9_client_clunk(ofid
);
605 p9_client_clunk(fid
);
611 * v9fs_vfs_create - VFS hook to create files
612 * @dir: directory inode that is being created
613 * @dentry: dentry that is being deleted
614 * @mode: create permissions
615 * @nd: path information
620 v9fs_vfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
621 struct nameidata
*nd
)
627 struct v9fs_inode
*v9inode
;
628 struct v9fs_session_info
*v9ses
;
629 struct p9_fid
*fid
, *inode_fid
;
633 v9ses
= v9fs_inode2v9ses(dir
);
634 perm
= unixmode2p9mode(v9ses
, mode
);
635 if (nd
&& nd
->flags
& LOOKUP_OPEN
)
636 flags
= nd
->intent
.open
.flags
- 1;
640 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
,
641 v9fs_uflags2omode(flags
,
642 v9fs_proto_dotu(v9ses
)));
649 v9fs_invalidate_inode_attr(dir
);
650 /* if we are opening a file, assign the open fid to the file */
651 if (nd
&& nd
->flags
& LOOKUP_OPEN
) {
652 v9inode
= V9FS_I(dentry
->d_inode
);
653 if (v9ses
->cache
&& !v9inode
->writeback_fid
) {
655 * clone a fid and add it to writeback_fid
656 * we do it during open time instead of
657 * page dirty time via write_begin/page_mkwrite
658 * because we want write after unlink usecase
661 inode_fid
= v9fs_writeback_fid(dentry
);
662 if (IS_ERR(inode_fid
)) {
663 err
= PTR_ERR(inode_fid
);
666 v9inode
->writeback_fid
= (void *) inode_fid
;
668 filp
= lookup_instantiate_filp(nd
, dentry
, generic_file_open
);
674 filp
->private_data
= fid
;
675 #ifdef CONFIG_9P_FSCACHE
677 v9fs_cache_inode_set_cookie(dentry
->d_inode
, filp
);
680 p9_client_clunk(fid
);
686 p9_client_clunk(fid
);
692 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
693 * @dir: inode that is being unlinked
694 * @dentry: dentry that is being unlinked
695 * @mode: mode for new directory
699 static int v9fs_vfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
704 struct v9fs_session_info
*v9ses
;
706 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
708 v9ses
= v9fs_inode2v9ses(dir
);
709 perm
= unixmode2p9mode(v9ses
, mode
| S_IFDIR
);
710 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
, P9_OREAD
);
716 v9fs_invalidate_inode_attr(dir
);
720 p9_client_clunk(fid
);
726 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
727 * @dir: inode that is being walked from
728 * @dentry: dentry that is being walked to?
729 * @nameidata: path data
733 struct dentry
*v9fs_vfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
734 struct nameidata
*nameidata
)
736 struct super_block
*sb
;
737 struct v9fs_session_info
*v9ses
;
738 struct p9_fid
*dfid
, *fid
;
743 P9_DPRINTK(P9_DEBUG_VFS
, "dir: %p dentry: (%s) %p nameidata: %p\n",
744 dir
, dentry
->d_name
.name
, dentry
, nameidata
);
746 if (dentry
->d_name
.len
> NAME_MAX
)
747 return ERR_PTR(-ENAMETOOLONG
);
750 v9ses
= v9fs_inode2v9ses(dir
);
751 /* We can walk d_parent because we hold the dir->i_mutex */
752 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
754 return ERR_CAST(dfid
);
756 name
= (char *) dentry
->d_name
.name
;
757 fid
= p9_client_walk(dfid
, 1, &name
, 1);
759 result
= PTR_ERR(fid
);
760 if (result
== -ENOENT
) {
765 return ERR_PTR(result
);
768 inode
= v9fs_get_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
770 result
= PTR_ERR(inode
);
775 result
= v9fs_fid_add(dentry
, fid
);
780 d_add(dentry
, inode
);
786 p9_client_clunk(fid
);
788 return ERR_PTR(result
);
792 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
793 * @i: inode that is being unlinked
794 * @d: dentry that is being unlinked
798 int v9fs_vfs_unlink(struct inode
*i
, struct dentry
*d
)
800 return v9fs_remove(i
, d
, 0);
804 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
805 * @i: inode that is being unlinked
806 * @d: dentry that is being unlinked
810 int v9fs_vfs_rmdir(struct inode
*i
, struct dentry
*d
)
812 return v9fs_remove(i
, d
, 1);
816 * v9fs_vfs_rename - VFS hook to rename an inode
817 * @old_dir: old dir inode
818 * @old_dentry: old dentry
819 * @new_dir: new dir inode
820 * @new_dentry: new dentry
825 v9fs_vfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
826 struct inode
*new_dir
, struct dentry
*new_dentry
)
829 struct inode
*old_inode
;
830 struct inode
*new_inode
;
831 struct v9fs_session_info
*v9ses
;
832 struct p9_fid
*oldfid
;
833 struct p9_fid
*olddirfid
;
834 struct p9_fid
*newdirfid
;
835 struct p9_wstat wstat
;
837 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
839 old_inode
= old_dentry
->d_inode
;
840 new_inode
= new_dentry
->d_inode
;
841 v9ses
= v9fs_inode2v9ses(old_inode
);
842 oldfid
= v9fs_fid_lookup(old_dentry
);
844 return PTR_ERR(oldfid
);
846 olddirfid
= v9fs_fid_clone(old_dentry
->d_parent
);
847 if (IS_ERR(olddirfid
)) {
848 retval
= PTR_ERR(olddirfid
);
852 newdirfid
= v9fs_fid_clone(new_dentry
->d_parent
);
853 if (IS_ERR(newdirfid
)) {
854 retval
= PTR_ERR(newdirfid
);
858 down_write(&v9ses
->rename_sem
);
859 if (v9fs_proto_dotl(v9ses
)) {
860 retval
= p9_client_rename(oldfid
, newdirfid
,
861 (char *) new_dentry
->d_name
.name
);
862 if (retval
!= -ENOSYS
)
865 if (old_dentry
->d_parent
!= new_dentry
->d_parent
) {
867 * 9P .u can only handle file rename in the same directory
870 P9_DPRINTK(P9_DEBUG_ERROR
,
871 "old dir and new dir are different\n");
875 v9fs_blank_wstat(&wstat
);
876 wstat
.muid
= v9ses
->uname
;
877 wstat
.name
= (char *) new_dentry
->d_name
.name
;
878 retval
= p9_client_wstat(oldfid
, &wstat
);
883 if (S_ISDIR(new_inode
->i_mode
))
884 clear_nlink(new_inode
);
886 drop_nlink(new_inode
);
888 if (S_ISDIR(old_inode
->i_mode
)) {
893 v9fs_invalidate_inode_attr(old_inode
);
894 v9fs_invalidate_inode_attr(old_dir
);
895 v9fs_invalidate_inode_attr(new_dir
);
897 /* successful rename */
898 d_move(old_dentry
, new_dentry
);
900 up_write(&v9ses
->rename_sem
);
901 p9_client_clunk(newdirfid
);
904 p9_client_clunk(olddirfid
);
911 * v9fs_vfs_getattr - retrieve file metadata
912 * @mnt: mount information
913 * @dentry: file to get attributes on
914 * @stat: metadata structure to populate
919 v9fs_vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
923 struct v9fs_session_info
*v9ses
;
927 P9_DPRINTK(P9_DEBUG_VFS
, "dentry: %p\n", dentry
);
929 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
930 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
) {
931 generic_fillattr(dentry
->d_inode
, stat
);
934 fid
= v9fs_fid_lookup(dentry
);
938 st
= p9_client_stat(fid
);
942 v9fs_stat2inode(st
, dentry
->d_inode
, dentry
->d_inode
->i_sb
);
943 generic_fillattr(dentry
->d_inode
, stat
);
951 * v9fs_vfs_setattr - set file metadata
952 * @dentry: file whose metadata to set
953 * @iattr: metadata assignment structure
957 static int v9fs_vfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
960 struct v9fs_session_info
*v9ses
;
962 struct p9_wstat wstat
;
964 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
966 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
967 fid
= v9fs_fid_lookup(dentry
);
971 v9fs_blank_wstat(&wstat
);
972 if (iattr
->ia_valid
& ATTR_MODE
)
973 wstat
.mode
= unixmode2p9mode(v9ses
, iattr
->ia_mode
);
975 if (iattr
->ia_valid
& ATTR_MTIME
)
976 wstat
.mtime
= iattr
->ia_mtime
.tv_sec
;
978 if (iattr
->ia_valid
& ATTR_ATIME
)
979 wstat
.atime
= iattr
->ia_atime
.tv_sec
;
981 if (iattr
->ia_valid
& ATTR_SIZE
)
982 wstat
.length
= iattr
->ia_size
;
984 if (v9fs_proto_dotu(v9ses
)) {
985 if (iattr
->ia_valid
& ATTR_UID
)
986 wstat
.n_uid
= iattr
->ia_uid
;
988 if (iattr
->ia_valid
& ATTR_GID
)
989 wstat
.n_gid
= iattr
->ia_gid
;
992 retval
= p9_client_wstat(fid
, &wstat
);
996 v9fs_invalidate_inode_attr(dentry
->d_inode
);
997 if ((iattr
->ia_valid
& ATTR_SIZE
) &&
998 iattr
->ia_size
!= i_size_read(dentry
->d_inode
)) {
999 retval
= vmtruncate(dentry
->d_inode
, iattr
->ia_size
);
1004 setattr_copy(dentry
->d_inode
, iattr
);
1005 mark_inode_dirty(dentry
->d_inode
);
1010 * v9fs_stat2inode - populate an inode structure with mistat info
1011 * @stat: Plan 9 metadata (mistat) structure
1012 * @inode: inode to populate
1013 * @sb: superblock of filesystem
1018 v9fs_stat2inode(struct p9_wstat
*stat
, struct inode
*inode
,
1019 struct super_block
*sb
)
1023 unsigned int i_nlink
;
1024 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
1025 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
1029 inode
->i_atime
.tv_sec
= stat
->atime
;
1030 inode
->i_mtime
.tv_sec
= stat
->mtime
;
1031 inode
->i_ctime
.tv_sec
= stat
->mtime
;
1033 inode
->i_uid
= v9ses
->dfltuid
;
1034 inode
->i_gid
= v9ses
->dfltgid
;
1036 if (v9fs_proto_dotu(v9ses
)) {
1037 inode
->i_uid
= stat
->n_uid
;
1038 inode
->i_gid
= stat
->n_gid
;
1040 if ((S_ISREG(inode
->i_mode
)) || (S_ISDIR(inode
->i_mode
))) {
1041 if (v9fs_proto_dotu(v9ses
) && (stat
->extension
[0] != '\0')) {
1043 * Hadlink support got added later to
1044 * to the .u extension. So there can be
1045 * server out there that doesn't support
1046 * this even with .u extension. So check
1047 * for non NULL stat->extension
1049 strncpy(ext
, stat
->extension
, sizeof(ext
));
1050 /* HARDLINKCOUNT %u */
1051 sscanf(ext
, "%13s %u", tag_name
, &i_nlink
);
1052 if (!strncmp(tag_name
, "HARDLINKCOUNT", 13))
1053 inode
->i_nlink
= i_nlink
;
1056 inode
->i_mode
= p9mode2unixmode(v9ses
, stat
->mode
);
1057 if ((S_ISBLK(inode
->i_mode
)) || (S_ISCHR(inode
->i_mode
))) {
1062 strncpy(ext
, stat
->extension
, sizeof(ext
));
1063 sscanf(ext
, "%c %u %u", &type
, &major
, &minor
);
1066 inode
->i_mode
&= ~S_IFBLK
;
1067 inode
->i_mode
|= S_IFCHR
;
1072 P9_DPRINTK(P9_DEBUG_ERROR
,
1073 "Unknown special type %c %s\n", type
,
1076 inode
->i_rdev
= MKDEV(major
, minor
);
1077 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
1081 i_size_write(inode
, stat
->length
);
1083 /* not real number of blocks, but 512 byte ones ... */
1084 inode
->i_blocks
= (i_size_read(inode
) + 512 - 1) >> 9;
1085 v9inode
->cache_validity
&= ~V9FS_INO_INVALID_ATTR
;
1089 * v9fs_qid2ino - convert qid into inode number
1092 * BUG: potential for inode number collisions?
1095 ino_t
v9fs_qid2ino(struct p9_qid
*qid
)
1097 u64 path
= qid
->path
+ 2;
1100 if (sizeof(ino_t
) == sizeof(path
))
1101 memcpy(&i
, &path
, sizeof(ino_t
));
1103 i
= (ino_t
) (path
^ (path
>> 32));
1109 * v9fs_readlink - read a symlink's location (internal version)
1110 * @dentry: dentry for symlink
1111 * @buffer: buffer to load symlink location into
1112 * @buflen: length of buffer
1116 static int v9fs_readlink(struct dentry
*dentry
, char *buffer
, int buflen
)
1120 struct v9fs_session_info
*v9ses
;
1122 struct p9_wstat
*st
;
1124 P9_DPRINTK(P9_DEBUG_VFS
, " %s\n", dentry
->d_name
.name
);
1126 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
1127 fid
= v9fs_fid_lookup(dentry
);
1129 return PTR_ERR(fid
);
1131 if (!v9fs_proto_dotu(v9ses
))
1134 st
= p9_client_stat(fid
);
1138 if (!(st
->mode
& P9_DMSYMLINK
)) {
1143 /* copy extension buffer into buffer */
1144 strncpy(buffer
, st
->extension
, buflen
);
1146 P9_DPRINTK(P9_DEBUG_VFS
,
1147 "%s -> %s (%s)\n", dentry
->d_name
.name
, st
->extension
, buffer
);
1149 retval
= strnlen(buffer
, buflen
);
1157 * v9fs_vfs_follow_link - follow a symlink path
1158 * @dentry: dentry for symlink
1163 static void *v9fs_vfs_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1166 char *link
= __getname();
1168 P9_DPRINTK(P9_DEBUG_VFS
, "%s n", dentry
->d_name
.name
);
1171 link
= ERR_PTR(-ENOMEM
);
1173 len
= v9fs_readlink(dentry
, link
, PATH_MAX
);
1177 link
= ERR_PTR(len
);
1179 link
[min(len
, PATH_MAX
-1)] = 0;
1181 nd_set_link(nd
, link
);
1187 * v9fs_vfs_put_link - release a symlink path
1188 * @dentry: dentry for symlink
1195 v9fs_vfs_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *p
)
1197 char *s
= nd_get_link(nd
);
1199 P9_DPRINTK(P9_DEBUG_VFS
, " %s %s\n", dentry
->d_name
.name
,
1200 IS_ERR(s
) ? "<error>" : s
);
1206 * v9fs_vfs_mkspecial - create a special file
1207 * @dir: inode to create special file in
1208 * @dentry: dentry to create
1209 * @mode: mode to create special file
1210 * @extension: 9p2000.u format extension string representing special file
1214 static int v9fs_vfs_mkspecial(struct inode
*dir
, struct dentry
*dentry
,
1215 int mode
, const char *extension
)
1219 struct v9fs_session_info
*v9ses
;
1221 v9ses
= v9fs_inode2v9ses(dir
);
1222 if (!v9fs_proto_dotu(v9ses
)) {
1223 P9_DPRINTK(P9_DEBUG_ERROR
, "not extended\n");
1227 perm
= unixmode2p9mode(v9ses
, mode
);
1228 fid
= v9fs_create(v9ses
, dir
, dentry
, (char *) extension
, perm
,
1231 return PTR_ERR(fid
);
1233 v9fs_invalidate_inode_attr(dir
);
1234 p9_client_clunk(fid
);
1239 * v9fs_vfs_symlink - helper function to create symlinks
1240 * @dir: directory inode containing symlink
1241 * @dentry: dentry for symlink
1242 * @symname: symlink data
1244 * See Also: 9P2000.u RFC for more information
1249 v9fs_vfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1251 P9_DPRINTK(P9_DEBUG_VFS
, " %lu,%s,%s\n", dir
->i_ino
,
1252 dentry
->d_name
.name
, symname
);
1254 return v9fs_vfs_mkspecial(dir
, dentry
, S_IFLNK
, symname
);
1258 * v9fs_vfs_link - create a hardlink
1259 * @old_dentry: dentry for file to link to
1260 * @dir: inode destination for new link
1261 * @dentry: dentry for link
1266 v9fs_vfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1267 struct dentry
*dentry
)
1271 struct p9_fid
*oldfid
;
1273 P9_DPRINTK(P9_DEBUG_VFS
,
1274 " %lu,%s,%s\n", dir
->i_ino
, dentry
->d_name
.name
,
1275 old_dentry
->d_name
.name
);
1277 oldfid
= v9fs_fid_clone(old_dentry
);
1279 return PTR_ERR(oldfid
);
1282 if (unlikely(!name
)) {
1287 sprintf(name
, "%d\n", oldfid
->fid
);
1288 retval
= v9fs_vfs_mkspecial(dir
, dentry
, P9_DMLINK
, name
);
1291 v9fs_invalidate_inode_attr(dir
);
1293 p9_client_clunk(oldfid
);
1298 * v9fs_vfs_mknod - create a special file
1299 * @dir: inode destination for new link
1300 * @dentry: dentry for file
1301 * @mode: mode for creation
1302 * @rdev: device associated with special file
1307 v9fs_vfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t rdev
)
1312 P9_DPRINTK(P9_DEBUG_VFS
,
1313 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir
->i_ino
,
1314 dentry
->d_name
.name
, mode
, MAJOR(rdev
), MINOR(rdev
));
1316 if (!new_valid_dev(rdev
))
1322 /* build extension */
1324 sprintf(name
, "b %u %u", MAJOR(rdev
), MINOR(rdev
));
1325 else if (S_ISCHR(mode
))
1326 sprintf(name
, "c %u %u", MAJOR(rdev
), MINOR(rdev
));
1327 else if (S_ISFIFO(mode
))
1329 else if (S_ISSOCK(mode
))
1336 retval
= v9fs_vfs_mkspecial(dir
, dentry
, mode
, name
);
1342 int v9fs_refresh_inode(struct p9_fid
*fid
, struct inode
*inode
)
1345 struct p9_wstat
*st
;
1346 struct v9fs_session_info
*v9ses
;
1348 v9ses
= v9fs_inode2v9ses(inode
);
1349 st
= p9_client_stat(fid
);
1353 spin_lock(&inode
->i_lock
);
1355 * We don't want to refresh inode->i_size,
1356 * because we may have cached data
1358 i_size
= inode
->i_size
;
1359 v9fs_stat2inode(st
, inode
, inode
->i_sb
);
1361 inode
->i_size
= i_size
;
1362 spin_unlock(&inode
->i_lock
);
1368 static const struct inode_operations v9fs_dir_inode_operations_dotu
= {
1369 .create
= v9fs_vfs_create
,
1370 .lookup
= v9fs_vfs_lookup
,
1371 .symlink
= v9fs_vfs_symlink
,
1372 .link
= v9fs_vfs_link
,
1373 .unlink
= v9fs_vfs_unlink
,
1374 .mkdir
= v9fs_vfs_mkdir
,
1375 .rmdir
= v9fs_vfs_rmdir
,
1376 .mknod
= v9fs_vfs_mknod
,
1377 .rename
= v9fs_vfs_rename
,
1378 .getattr
= v9fs_vfs_getattr
,
1379 .setattr
= v9fs_vfs_setattr
,
1382 static const struct inode_operations v9fs_dir_inode_operations
= {
1383 .create
= v9fs_vfs_create
,
1384 .lookup
= v9fs_vfs_lookup
,
1385 .unlink
= v9fs_vfs_unlink
,
1386 .mkdir
= v9fs_vfs_mkdir
,
1387 .rmdir
= v9fs_vfs_rmdir
,
1388 .mknod
= v9fs_vfs_mknod
,
1389 .rename
= v9fs_vfs_rename
,
1390 .getattr
= v9fs_vfs_getattr
,
1391 .setattr
= v9fs_vfs_setattr
,
1394 static const struct inode_operations v9fs_file_inode_operations
= {
1395 .getattr
= v9fs_vfs_getattr
,
1396 .setattr
= v9fs_vfs_setattr
,
1399 static const struct inode_operations v9fs_symlink_inode_operations
= {
1400 .readlink
= generic_readlink
,
1401 .follow_link
= v9fs_vfs_follow_link
,
1402 .put_link
= v9fs_vfs_put_link
,
1403 .getattr
= v9fs_vfs_getattr
,
1404 .setattr
= v9fs_vfs_setattr
,