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 spin_lock_init(&v9inode
->fscache_lock
);
221 v9inode
->writeback_fid
= NULL
;
222 v9inode
->cache_validity
= 0;
223 mutex_init(&v9inode
->v_mutex
);
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 int v9fs_test_inode(struct inode
*inode
, void *data
)
438 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
439 struct p9_wstat
*st
= (struct p9_wstat
*)data
;
440 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
442 umode
= p9mode2unixmode(v9ses
, st
->mode
);
443 /* don't match inode of different type */
444 if ((inode
->i_mode
& S_IFMT
) != (umode
& S_IFMT
))
447 /* compare qid details */
448 if (memcmp(&v9inode
->qid
.version
,
449 &st
->qid
.version
, sizeof(v9inode
->qid
.version
)))
452 if (v9inode
->qid
.type
!= st
->qid
.type
)
457 static int v9fs_test_new_inode(struct inode
*inode
, void *data
)
462 static int v9fs_set_inode(struct inode
*inode
, void *data
)
464 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
465 struct p9_wstat
*st
= (struct p9_wstat
*)data
;
467 memcpy(&v9inode
->qid
, &st
->qid
, sizeof(st
->qid
));
471 static struct inode
*v9fs_qid_iget(struct super_block
*sb
,
479 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
480 int (*test
)(struct inode
*, void *);
483 test
= v9fs_test_new_inode
;
485 test
= v9fs_test_inode
;
487 i_ino
= v9fs_qid2ino(qid
);
488 inode
= iget5_locked(sb
, i_ino
, test
, v9fs_set_inode
, st
);
490 return ERR_PTR(-ENOMEM
);
491 if (!(inode
->i_state
& I_NEW
))
494 * initialize the inode with the stat info
495 * FIXME!! we may need support for stale inodes
498 inode
->i_ino
= i_ino
;
499 umode
= p9mode2unixmode(v9ses
, st
->mode
);
500 retval
= v9fs_init_inode(v9ses
, inode
, umode
);
504 v9fs_stat2inode(st
, inode
, sb
);
505 #ifdef CONFIG_9P_FSCACHE
506 v9fs_cache_inode_get_cookie(inode
);
508 unlock_new_inode(inode
);
511 unlock_new_inode(inode
);
513 return ERR_PTR(retval
);
518 v9fs_inode_from_fid(struct v9fs_session_info
*v9ses
, struct p9_fid
*fid
,
519 struct super_block
*sb
, int new)
522 struct inode
*inode
= NULL
;
524 st
= p9_client_stat(fid
);
528 inode
= v9fs_qid_iget(sb
, &st
->qid
, st
, new);
535 * v9fs_remove - helper function to remove files and directories
536 * @dir: directory inode that is being deleted
537 * @file: dentry that is being deleted
538 * @rmdir: removing a directory
542 static int v9fs_remove(struct inode
*dir
, struct dentry
*file
, int rmdir
)
545 struct p9_fid
*v9fid
;
546 struct inode
*file_inode
;
548 P9_DPRINTK(P9_DEBUG_VFS
, "inode: %p dentry: %p rmdir: %d\n", dir
, file
,
551 file_inode
= file
->d_inode
;
552 v9fid
= v9fs_fid_clone(file
);
554 return PTR_ERR(v9fid
);
556 retval
= p9_client_remove(v9fid
);
559 * directories on unlink should have zero
563 clear_nlink(file_inode
);
566 drop_nlink(file_inode
);
568 v9fs_invalidate_inode_attr(file_inode
);
569 v9fs_invalidate_inode_attr(dir
);
575 * v9fs_create - Create a file
576 * @v9ses: session information
577 * @dir: directory that dentry is being created in
578 * @dentry: dentry that is being created
579 * @extension: 9p2000.u extension string to support devices, etc.
580 * @perm: create permissions
584 static struct p9_fid
*
585 v9fs_create(struct v9fs_session_info
*v9ses
, struct inode
*dir
,
586 struct dentry
*dentry
, char *extension
, u32 perm
, u8 mode
)
590 struct p9_fid
*dfid
, *ofid
, *fid
;
593 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
598 name
= (char *) dentry
->d_name
.name
;
599 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
602 P9_DPRINTK(P9_DEBUG_VFS
, "fid lookup failed %d\n", err
);
606 /* clone a fid to use for creation */
607 ofid
= p9_client_walk(dfid
, 0, NULL
, 1);
610 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
614 err
= p9_client_fcreate(ofid
, name
, perm
, mode
, extension
);
616 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_fcreate failed %d\n", err
);
620 /* now walk from the parent so we can get unopened fid */
621 fid
= p9_client_walk(dfid
, 1, &name
, 1);
624 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
629 /* instantiate inode and assign the unopened fid to the dentry */
630 inode
= v9fs_get_new_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
632 err
= PTR_ERR(inode
);
633 P9_DPRINTK(P9_DEBUG_VFS
, "inode creation failed %d\n", err
);
636 d_instantiate(dentry
, inode
);
637 err
= v9fs_fid_add(dentry
, fid
);
645 p9_client_clunk(ofid
);
648 p9_client_clunk(fid
);
654 * v9fs_vfs_create - VFS hook to create files
655 * @dir: directory inode that is being created
656 * @dentry: dentry that is being deleted
657 * @mode: create permissions
658 * @nd: path information
663 v9fs_vfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
664 struct nameidata
*nd
)
670 struct v9fs_inode
*v9inode
;
671 struct v9fs_session_info
*v9ses
;
672 struct p9_fid
*fid
, *inode_fid
;
676 v9ses
= v9fs_inode2v9ses(dir
);
677 perm
= unixmode2p9mode(v9ses
, mode
);
679 flags
= nd
->intent
.open
.flags
;
683 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
,
684 v9fs_uflags2omode(flags
,
685 v9fs_proto_dotu(v9ses
)));
692 v9fs_invalidate_inode_attr(dir
);
693 /* if we are opening a file, assign the open fid to the file */
695 v9inode
= V9FS_I(dentry
->d_inode
);
696 mutex_lock(&v9inode
->v_mutex
);
697 if (v9ses
->cache
&& !v9inode
->writeback_fid
&&
698 ((flags
& O_ACCMODE
) != O_RDONLY
)) {
700 * clone a fid and add it to writeback_fid
701 * we do it during open time instead of
702 * page dirty time via write_begin/page_mkwrite
703 * because we want write after unlink usecase
706 inode_fid
= v9fs_writeback_fid(dentry
);
707 if (IS_ERR(inode_fid
)) {
708 err
= PTR_ERR(inode_fid
);
709 mutex_unlock(&v9inode
->v_mutex
);
712 v9inode
->writeback_fid
= (void *) inode_fid
;
714 mutex_unlock(&v9inode
->v_mutex
);
715 filp
= lookup_instantiate_filp(nd
, dentry
, generic_file_open
);
721 filp
->private_data
= fid
;
722 #ifdef CONFIG_9P_FSCACHE
724 v9fs_cache_inode_set_cookie(dentry
->d_inode
, filp
);
727 p9_client_clunk(fid
);
733 p9_client_clunk(fid
);
739 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
740 * @dir: inode that is being unlinked
741 * @dentry: dentry that is being unlinked
742 * @mode: mode for new directory
746 static int v9fs_vfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
751 struct v9fs_session_info
*v9ses
;
753 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
755 v9ses
= v9fs_inode2v9ses(dir
);
756 perm
= unixmode2p9mode(v9ses
, mode
| S_IFDIR
);
757 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
, P9_OREAD
);
763 v9fs_invalidate_inode_attr(dir
);
767 p9_client_clunk(fid
);
773 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
774 * @dir: inode that is being walked from
775 * @dentry: dentry that is being walked to?
776 * @nameidata: path data
780 struct dentry
*v9fs_vfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
781 struct nameidata
*nameidata
)
783 struct super_block
*sb
;
784 struct v9fs_session_info
*v9ses
;
785 struct p9_fid
*dfid
, *fid
;
790 P9_DPRINTK(P9_DEBUG_VFS
, "dir: %p dentry: (%s) %p nameidata: %p\n",
791 dir
, dentry
->d_name
.name
, dentry
, nameidata
);
793 if (dentry
->d_name
.len
> NAME_MAX
)
794 return ERR_PTR(-ENAMETOOLONG
);
797 v9ses
= v9fs_inode2v9ses(dir
);
798 /* We can walk d_parent because we hold the dir->i_mutex */
799 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
801 return ERR_CAST(dfid
);
803 name
= (char *) dentry
->d_name
.name
;
804 fid
= p9_client_walk(dfid
, 1, &name
, 1);
806 result
= PTR_ERR(fid
);
807 if (result
== -ENOENT
) {
812 return ERR_PTR(result
);
815 inode
= v9fs_get_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
817 result
= PTR_ERR(inode
);
822 result
= v9fs_fid_add(dentry
, fid
);
827 d_add(dentry
, inode
);
833 p9_client_clunk(fid
);
835 return ERR_PTR(result
);
839 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
840 * @i: inode that is being unlinked
841 * @d: dentry that is being unlinked
845 int v9fs_vfs_unlink(struct inode
*i
, struct dentry
*d
)
847 return v9fs_remove(i
, d
, 0);
851 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
852 * @i: inode that is being unlinked
853 * @d: dentry that is being unlinked
857 int v9fs_vfs_rmdir(struct inode
*i
, struct dentry
*d
)
859 return v9fs_remove(i
, d
, 1);
863 * v9fs_vfs_rename - VFS hook to rename an inode
864 * @old_dir: old dir inode
865 * @old_dentry: old dentry
866 * @new_dir: new dir inode
867 * @new_dentry: new dentry
872 v9fs_vfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
873 struct inode
*new_dir
, struct dentry
*new_dentry
)
876 struct inode
*old_inode
;
877 struct inode
*new_inode
;
878 struct v9fs_session_info
*v9ses
;
879 struct p9_fid
*oldfid
;
880 struct p9_fid
*olddirfid
;
881 struct p9_fid
*newdirfid
;
882 struct p9_wstat wstat
;
884 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
886 old_inode
= old_dentry
->d_inode
;
887 new_inode
= new_dentry
->d_inode
;
888 v9ses
= v9fs_inode2v9ses(old_inode
);
889 oldfid
= v9fs_fid_lookup(old_dentry
);
891 return PTR_ERR(oldfid
);
893 olddirfid
= v9fs_fid_clone(old_dentry
->d_parent
);
894 if (IS_ERR(olddirfid
)) {
895 retval
= PTR_ERR(olddirfid
);
899 newdirfid
= v9fs_fid_clone(new_dentry
->d_parent
);
900 if (IS_ERR(newdirfid
)) {
901 retval
= PTR_ERR(newdirfid
);
905 down_write(&v9ses
->rename_sem
);
906 if (v9fs_proto_dotl(v9ses
)) {
907 retval
= p9_client_renameat(olddirfid
, old_dentry
->d_name
.name
,
908 newdirfid
, new_dentry
->d_name
.name
);
909 if (retval
== -EOPNOTSUPP
)
910 retval
= p9_client_rename(oldfid
, newdirfid
,
911 new_dentry
->d_name
.name
);
912 if (retval
!= -EOPNOTSUPP
)
915 if (old_dentry
->d_parent
!= new_dentry
->d_parent
) {
917 * 9P .u can only handle file rename in the same directory
920 P9_DPRINTK(P9_DEBUG_ERROR
,
921 "old dir and new dir are different\n");
925 v9fs_blank_wstat(&wstat
);
926 wstat
.muid
= v9ses
->uname
;
927 wstat
.name
= (char *) new_dentry
->d_name
.name
;
928 retval
= p9_client_wstat(oldfid
, &wstat
);
933 if (S_ISDIR(new_inode
->i_mode
))
934 clear_nlink(new_inode
);
936 drop_nlink(new_inode
);
938 if (S_ISDIR(old_inode
->i_mode
)) {
943 v9fs_invalidate_inode_attr(old_inode
);
944 v9fs_invalidate_inode_attr(old_dir
);
945 v9fs_invalidate_inode_attr(new_dir
);
947 /* successful rename */
948 d_move(old_dentry
, new_dentry
);
950 up_write(&v9ses
->rename_sem
);
951 p9_client_clunk(newdirfid
);
954 p9_client_clunk(olddirfid
);
961 * v9fs_vfs_getattr - retrieve file metadata
962 * @mnt: mount information
963 * @dentry: file to get attributes on
964 * @stat: metadata structure to populate
969 v9fs_vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
973 struct v9fs_session_info
*v9ses
;
977 P9_DPRINTK(P9_DEBUG_VFS
, "dentry: %p\n", dentry
);
979 v9ses
= v9fs_dentry2v9ses(dentry
);
980 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
) {
981 generic_fillattr(dentry
->d_inode
, stat
);
984 fid
= v9fs_fid_lookup(dentry
);
988 st
= p9_client_stat(fid
);
992 v9fs_stat2inode(st
, dentry
->d_inode
, dentry
->d_inode
->i_sb
);
993 generic_fillattr(dentry
->d_inode
, stat
);
1001 * v9fs_vfs_setattr - set file metadata
1002 * @dentry: file whose metadata to set
1003 * @iattr: metadata assignment structure
1007 static int v9fs_vfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1010 struct v9fs_session_info
*v9ses
;
1012 struct p9_wstat wstat
;
1014 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
1015 retval
= inode_change_ok(dentry
->d_inode
, iattr
);
1020 v9ses
= v9fs_dentry2v9ses(dentry
);
1021 fid
= v9fs_fid_lookup(dentry
);
1023 return PTR_ERR(fid
);
1025 v9fs_blank_wstat(&wstat
);
1026 if (iattr
->ia_valid
& ATTR_MODE
)
1027 wstat
.mode
= unixmode2p9mode(v9ses
, iattr
->ia_mode
);
1029 if (iattr
->ia_valid
& ATTR_MTIME
)
1030 wstat
.mtime
= iattr
->ia_mtime
.tv_sec
;
1032 if (iattr
->ia_valid
& ATTR_ATIME
)
1033 wstat
.atime
= iattr
->ia_atime
.tv_sec
;
1035 if (iattr
->ia_valid
& ATTR_SIZE
)
1036 wstat
.length
= iattr
->ia_size
;
1038 if (v9fs_proto_dotu(v9ses
)) {
1039 if (iattr
->ia_valid
& ATTR_UID
)
1040 wstat
.n_uid
= iattr
->ia_uid
;
1042 if (iattr
->ia_valid
& ATTR_GID
)
1043 wstat
.n_gid
= iattr
->ia_gid
;
1046 /* Write all dirty data */
1047 if (S_ISREG(dentry
->d_inode
->i_mode
))
1048 filemap_write_and_wait(dentry
->d_inode
->i_mapping
);
1050 retval
= p9_client_wstat(fid
, &wstat
);
1054 if ((iattr
->ia_valid
& ATTR_SIZE
) &&
1055 iattr
->ia_size
!= i_size_read(dentry
->d_inode
))
1056 truncate_setsize(dentry
->d_inode
, iattr
->ia_size
);
1058 v9fs_invalidate_inode_attr(dentry
->d_inode
);
1060 setattr_copy(dentry
->d_inode
, iattr
);
1061 mark_inode_dirty(dentry
->d_inode
);
1066 * v9fs_stat2inode - populate an inode structure with mistat info
1067 * @stat: Plan 9 metadata (mistat) structure
1068 * @inode: inode to populate
1069 * @sb: superblock of filesystem
1074 v9fs_stat2inode(struct p9_wstat
*stat
, struct inode
*inode
,
1075 struct super_block
*sb
)
1079 unsigned int i_nlink
;
1080 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
1081 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
1085 inode
->i_atime
.tv_sec
= stat
->atime
;
1086 inode
->i_mtime
.tv_sec
= stat
->mtime
;
1087 inode
->i_ctime
.tv_sec
= stat
->mtime
;
1089 inode
->i_uid
= v9ses
->dfltuid
;
1090 inode
->i_gid
= v9ses
->dfltgid
;
1092 if (v9fs_proto_dotu(v9ses
)) {
1093 inode
->i_uid
= stat
->n_uid
;
1094 inode
->i_gid
= stat
->n_gid
;
1096 if ((S_ISREG(inode
->i_mode
)) || (S_ISDIR(inode
->i_mode
))) {
1097 if (v9fs_proto_dotu(v9ses
) && (stat
->extension
[0] != '\0')) {
1099 * Hadlink support got added later to
1100 * to the .u extension. So there can be
1101 * server out there that doesn't support
1102 * this even with .u extension. So check
1103 * for non NULL stat->extension
1105 strncpy(ext
, stat
->extension
, sizeof(ext
));
1106 /* HARDLINKCOUNT %u */
1107 sscanf(ext
, "%13s %u", tag_name
, &i_nlink
);
1108 if (!strncmp(tag_name
, "HARDLINKCOUNT", 13))
1109 inode
->i_nlink
= i_nlink
;
1112 inode
->i_mode
= p9mode2unixmode(v9ses
, stat
->mode
);
1113 if ((S_ISBLK(inode
->i_mode
)) || (S_ISCHR(inode
->i_mode
))) {
1118 strncpy(ext
, stat
->extension
, sizeof(ext
));
1119 sscanf(ext
, "%c %u %u", &type
, &major
, &minor
);
1122 inode
->i_mode
&= ~S_IFBLK
;
1123 inode
->i_mode
|= S_IFCHR
;
1128 P9_DPRINTK(P9_DEBUG_ERROR
,
1129 "Unknown special type %c %s\n", type
,
1132 inode
->i_rdev
= MKDEV(major
, minor
);
1133 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
1137 i_size_write(inode
, stat
->length
);
1139 /* not real number of blocks, but 512 byte ones ... */
1140 inode
->i_blocks
= (i_size_read(inode
) + 512 - 1) >> 9;
1141 v9inode
->cache_validity
&= ~V9FS_INO_INVALID_ATTR
;
1145 * v9fs_qid2ino - convert qid into inode number
1148 * BUG: potential for inode number collisions?
1151 ino_t
v9fs_qid2ino(struct p9_qid
*qid
)
1153 u64 path
= qid
->path
+ 2;
1156 if (sizeof(ino_t
) == sizeof(path
))
1157 memcpy(&i
, &path
, sizeof(ino_t
));
1159 i
= (ino_t
) (path
^ (path
>> 32));
1165 * v9fs_readlink - read a symlink's location (internal version)
1166 * @dentry: dentry for symlink
1167 * @buffer: buffer to load symlink location into
1168 * @buflen: length of buffer
1172 static int v9fs_readlink(struct dentry
*dentry
, char *buffer
, int buflen
)
1176 struct v9fs_session_info
*v9ses
;
1178 struct p9_wstat
*st
;
1180 P9_DPRINTK(P9_DEBUG_VFS
, " %s\n", dentry
->d_name
.name
);
1182 v9ses
= v9fs_dentry2v9ses(dentry
);
1183 fid
= v9fs_fid_lookup(dentry
);
1185 return PTR_ERR(fid
);
1187 if (!v9fs_proto_dotu(v9ses
))
1190 st
= p9_client_stat(fid
);
1194 if (!(st
->mode
& P9_DMSYMLINK
)) {
1199 /* copy extension buffer into buffer */
1200 strncpy(buffer
, st
->extension
, buflen
);
1202 P9_DPRINTK(P9_DEBUG_VFS
,
1203 "%s -> %s (%s)\n", dentry
->d_name
.name
, st
->extension
, buffer
);
1205 retval
= strnlen(buffer
, buflen
);
1213 * v9fs_vfs_follow_link - follow a symlink path
1214 * @dentry: dentry for symlink
1219 static void *v9fs_vfs_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1222 char *link
= __getname();
1224 P9_DPRINTK(P9_DEBUG_VFS
, "%s n", dentry
->d_name
.name
);
1227 link
= ERR_PTR(-ENOMEM
);
1229 len
= v9fs_readlink(dentry
, link
, PATH_MAX
);
1233 link
= ERR_PTR(len
);
1235 link
[min(len
, PATH_MAX
-1)] = 0;
1237 nd_set_link(nd
, link
);
1243 * v9fs_vfs_put_link - release a symlink path
1244 * @dentry: dentry for symlink
1251 v9fs_vfs_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *p
)
1253 char *s
= nd_get_link(nd
);
1255 P9_DPRINTK(P9_DEBUG_VFS
, " %s %s\n", dentry
->d_name
.name
,
1256 IS_ERR(s
) ? "<error>" : s
);
1262 * v9fs_vfs_mkspecial - create a special file
1263 * @dir: inode to create special file in
1264 * @dentry: dentry to create
1265 * @mode: mode to create special file
1266 * @extension: 9p2000.u format extension string representing special file
1270 static int v9fs_vfs_mkspecial(struct inode
*dir
, struct dentry
*dentry
,
1271 int mode
, const char *extension
)
1275 struct v9fs_session_info
*v9ses
;
1277 v9ses
= v9fs_inode2v9ses(dir
);
1278 if (!v9fs_proto_dotu(v9ses
)) {
1279 P9_DPRINTK(P9_DEBUG_ERROR
, "not extended\n");
1283 perm
= unixmode2p9mode(v9ses
, mode
);
1284 fid
= v9fs_create(v9ses
, dir
, dentry
, (char *) extension
, perm
,
1287 return PTR_ERR(fid
);
1289 v9fs_invalidate_inode_attr(dir
);
1290 p9_client_clunk(fid
);
1295 * v9fs_vfs_symlink - helper function to create symlinks
1296 * @dir: directory inode containing symlink
1297 * @dentry: dentry for symlink
1298 * @symname: symlink data
1300 * See Also: 9P2000.u RFC for more information
1305 v9fs_vfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1307 P9_DPRINTK(P9_DEBUG_VFS
, " %lu,%s,%s\n", dir
->i_ino
,
1308 dentry
->d_name
.name
, symname
);
1310 return v9fs_vfs_mkspecial(dir
, dentry
, S_IFLNK
, symname
);
1314 * v9fs_vfs_link - create a hardlink
1315 * @old_dentry: dentry for file to link to
1316 * @dir: inode destination for new link
1317 * @dentry: dentry for link
1322 v9fs_vfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1323 struct dentry
*dentry
)
1327 struct p9_fid
*oldfid
;
1329 P9_DPRINTK(P9_DEBUG_VFS
,
1330 " %lu,%s,%s\n", dir
->i_ino
, dentry
->d_name
.name
,
1331 old_dentry
->d_name
.name
);
1333 oldfid
= v9fs_fid_clone(old_dentry
);
1335 return PTR_ERR(oldfid
);
1338 if (unlikely(!name
)) {
1343 sprintf(name
, "%d\n", oldfid
->fid
);
1344 retval
= v9fs_vfs_mkspecial(dir
, dentry
, P9_DMLINK
, name
);
1347 v9fs_refresh_inode(oldfid
, old_dentry
->d_inode
);
1348 v9fs_invalidate_inode_attr(dir
);
1351 p9_client_clunk(oldfid
);
1356 * v9fs_vfs_mknod - create a special file
1357 * @dir: inode destination for new link
1358 * @dentry: dentry for file
1359 * @mode: mode for creation
1360 * @rdev: device associated with special file
1365 v9fs_vfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t rdev
)
1370 P9_DPRINTK(P9_DEBUG_VFS
,
1371 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir
->i_ino
,
1372 dentry
->d_name
.name
, mode
, MAJOR(rdev
), MINOR(rdev
));
1374 if (!new_valid_dev(rdev
))
1380 /* build extension */
1382 sprintf(name
, "b %u %u", MAJOR(rdev
), MINOR(rdev
));
1383 else if (S_ISCHR(mode
))
1384 sprintf(name
, "c %u %u", MAJOR(rdev
), MINOR(rdev
));
1385 else if (S_ISFIFO(mode
))
1387 else if (S_ISSOCK(mode
))
1394 retval
= v9fs_vfs_mkspecial(dir
, dentry
, mode
, name
);
1400 int v9fs_refresh_inode(struct p9_fid
*fid
, struct inode
*inode
)
1403 struct p9_wstat
*st
;
1404 struct v9fs_session_info
*v9ses
;
1406 v9ses
= v9fs_inode2v9ses(inode
);
1407 st
= p9_client_stat(fid
);
1411 spin_lock(&inode
->i_lock
);
1413 * We don't want to refresh inode->i_size,
1414 * because we may have cached data
1416 i_size
= inode
->i_size
;
1417 v9fs_stat2inode(st
, inode
, inode
->i_sb
);
1419 inode
->i_size
= i_size
;
1420 spin_unlock(&inode
->i_lock
);
1426 static const struct inode_operations v9fs_dir_inode_operations_dotu
= {
1427 .create
= v9fs_vfs_create
,
1428 .lookup
= v9fs_vfs_lookup
,
1429 .symlink
= v9fs_vfs_symlink
,
1430 .link
= v9fs_vfs_link
,
1431 .unlink
= v9fs_vfs_unlink
,
1432 .mkdir
= v9fs_vfs_mkdir
,
1433 .rmdir
= v9fs_vfs_rmdir
,
1434 .mknod
= v9fs_vfs_mknod
,
1435 .rename
= v9fs_vfs_rename
,
1436 .getattr
= v9fs_vfs_getattr
,
1437 .setattr
= v9fs_vfs_setattr
,
1440 static const struct inode_operations v9fs_dir_inode_operations
= {
1441 .create
= v9fs_vfs_create
,
1442 .lookup
= v9fs_vfs_lookup
,
1443 .unlink
= v9fs_vfs_unlink
,
1444 .mkdir
= v9fs_vfs_mkdir
,
1445 .rmdir
= v9fs_vfs_rmdir
,
1446 .mknod
= v9fs_vfs_mknod
,
1447 .rename
= v9fs_vfs_rename
,
1448 .getattr
= v9fs_vfs_getattr
,
1449 .setattr
= v9fs_vfs_setattr
,
1452 static const struct inode_operations v9fs_file_inode_operations
= {
1453 .getattr
= v9fs_vfs_getattr
,
1454 .setattr
= v9fs_vfs_setattr
,
1457 static const struct inode_operations v9fs_symlink_inode_operations
= {
1458 .readlink
= generic_readlink
,
1459 .follow_link
= v9fs_vfs_follow_link
,
1460 .put_link
= v9fs_vfs_put_link
,
1461 .getattr
= v9fs_vfs_getattr
,
1462 .setattr
= v9fs_vfs_setattr
,