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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/module.h>
29 #include <linux/errno.h>
31 #include <linux/file.h>
32 #include <linux/pagemap.h>
33 #include <linux/stat.h>
34 #include <linux/string.h>
35 #include <linux/inet.h>
36 #include <linux/namei.h>
37 #include <linux/idr.h>
38 #include <linux/sched.h>
39 #include <linux/slab.h>
40 #include <linux/xattr.h>
41 #include <linux/posix_acl.h>
42 #include <net/9p/9p.h>
43 #include <net/9p/client.h>
52 static const struct inode_operations v9fs_dir_inode_operations
;
53 static const struct inode_operations v9fs_dir_inode_operations_dotu
;
54 static const struct inode_operations v9fs_file_inode_operations
;
55 static const struct inode_operations v9fs_symlink_inode_operations
;
58 * unixmode2p9mode - convert unix mode bits to plan 9
59 * @v9ses: v9fs session information
60 * @mode: mode to convert
64 static u32
unixmode2p9mode(struct v9fs_session_info
*v9ses
, umode_t mode
)
70 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
)
93 * p9mode2perm- convert plan9 mode bits to unix permission bits
94 * @v9ses: v9fs session information
95 * @stat: p9_wstat from which mode need to be derived
98 static int p9mode2perm(struct v9fs_session_info
*v9ses
,
99 struct p9_wstat
*stat
)
102 int mode
= stat
->mode
;
104 res
= mode
& S_IALLUGO
;
105 if (v9fs_proto_dotu(v9ses
)) {
106 if ((mode
& P9_DMSETUID
) == P9_DMSETUID
)
109 if ((mode
& P9_DMSETGID
) == P9_DMSETGID
)
112 if ((mode
& P9_DMSETVTX
) == P9_DMSETVTX
)
119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
120 * @v9ses: v9fs session information
121 * @stat: p9_wstat from which mode need to be derived
122 * @rdev: major number, minor number in case of device files.
125 static umode_t
p9mode2unixmode(struct v9fs_session_info
*v9ses
,
126 struct p9_wstat
*stat
, dev_t
*rdev
)
129 u32 mode
= stat
->mode
;
132 res
= p9mode2perm(v9ses
, stat
);
134 if ((mode
& P9_DMDIR
) == P9_DMDIR
)
136 else if ((mode
& P9_DMSYMLINK
) && (v9fs_proto_dotu(v9ses
)))
138 else if ((mode
& P9_DMSOCKET
) && (v9fs_proto_dotu(v9ses
))
139 && (v9ses
->nodev
== 0))
141 else if ((mode
& P9_DMNAMEDPIPE
) && (v9fs_proto_dotu(v9ses
))
142 && (v9ses
->nodev
== 0))
144 else if ((mode
& P9_DMDEVICE
) && (v9fs_proto_dotu(v9ses
))
145 && (v9ses
->nodev
== 0)) {
146 char type
= 0, ext
[32];
147 int major
= -1, minor
= -1;
149 strlcpy(ext
, stat
->extension
, sizeof(ext
));
150 sscanf(ext
, "%c %i %i", &type
, &major
, &minor
);
159 p9_debug(P9_DEBUG_ERROR
, "Unknown special type %c %s\n",
160 type
, stat
->extension
);
162 *rdev
= MKDEV(major
, minor
);
170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
171 * @uflags: flags to convert
172 * @extended: if .u extensions are active
175 int v9fs_uflags2omode(int uflags
, int extended
)
199 if (uflags
& O_APPEND
)
207 * v9fs_blank_wstat - helper function to setup a 9P stat structure
208 * @wstat: structure to initialize
213 v9fs_blank_wstat(struct p9_wstat
*wstat
)
217 wstat
->qid
.type
= ~0;
218 wstat
->qid
.version
= ~0;
219 *((long long *)&wstat
->qid
.path
) = ~0;
228 wstat
->n_uid
= INVALID_UID
;
229 wstat
->n_gid
= INVALID_GID
;
230 wstat
->n_muid
= INVALID_UID
;
231 wstat
->extension
= NULL
;
235 * v9fs_alloc_inode - helper function to allocate an inode
238 struct inode
*v9fs_alloc_inode(struct super_block
*sb
)
240 struct v9fs_inode
*v9inode
;
241 v9inode
= (struct v9fs_inode
*)kmem_cache_alloc(v9fs_inode_cache
,
245 #ifdef CONFIG_9P_FSCACHE
246 v9inode
->fscache
= NULL
;
247 spin_lock_init(&v9inode
->fscache_lock
);
249 v9inode
->writeback_fid
= NULL
;
250 v9inode
->cache_validity
= 0;
251 mutex_init(&v9inode
->v_mutex
);
252 return &v9inode
->vfs_inode
;
256 * v9fs_destroy_inode - destroy an inode
260 static void v9fs_i_callback(struct rcu_head
*head
)
262 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
263 kmem_cache_free(v9fs_inode_cache
, V9FS_I(inode
));
266 void v9fs_destroy_inode(struct inode
*inode
)
268 call_rcu(&inode
->i_rcu
, v9fs_i_callback
);
271 int v9fs_init_inode(struct v9fs_session_info
*v9ses
,
272 struct inode
*inode
, umode_t mode
, dev_t rdev
)
276 inode_init_owner(inode
, NULL
, mode
);
278 inode
->i_rdev
= rdev
;
279 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
280 inode
->i_mapping
->a_ops
= &v9fs_addr_operations
;
282 switch (mode
& S_IFMT
) {
287 if (v9fs_proto_dotl(v9ses
)) {
288 inode
->i_op
= &v9fs_file_inode_operations_dotl
;
289 } else if (v9fs_proto_dotu(v9ses
)) {
290 inode
->i_op
= &v9fs_file_inode_operations
;
292 p9_debug(P9_DEBUG_ERROR
,
293 "special files without extended mode\n");
297 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
300 if (v9fs_proto_dotl(v9ses
)) {
301 inode
->i_op
= &v9fs_file_inode_operations_dotl
;
302 if (v9ses
->cache
== CACHE_LOOSE
||
303 v9ses
->cache
== CACHE_FSCACHE
)
305 &v9fs_cached_file_operations_dotl
;
306 else if (v9ses
->cache
== CACHE_MMAP
)
307 inode
->i_fop
= &v9fs_mmap_file_operations_dotl
;
309 inode
->i_fop
= &v9fs_file_operations_dotl
;
311 inode
->i_op
= &v9fs_file_inode_operations
;
312 if (v9ses
->cache
== CACHE_LOOSE
||
313 v9ses
->cache
== CACHE_FSCACHE
)
315 &v9fs_cached_file_operations
;
316 else if (v9ses
->cache
== CACHE_MMAP
)
317 inode
->i_fop
= &v9fs_mmap_file_operations
;
319 inode
->i_fop
= &v9fs_file_operations
;
324 if (!v9fs_proto_dotu(v9ses
) && !v9fs_proto_dotl(v9ses
)) {
325 p9_debug(P9_DEBUG_ERROR
,
326 "extended modes used with legacy protocol\n");
331 if (v9fs_proto_dotl(v9ses
))
332 inode
->i_op
= &v9fs_symlink_inode_operations_dotl
;
334 inode
->i_op
= &v9fs_symlink_inode_operations
;
339 if (v9fs_proto_dotl(v9ses
))
340 inode
->i_op
= &v9fs_dir_inode_operations_dotl
;
341 else if (v9fs_proto_dotu(v9ses
))
342 inode
->i_op
= &v9fs_dir_inode_operations_dotu
;
344 inode
->i_op
= &v9fs_dir_inode_operations
;
346 if (v9fs_proto_dotl(v9ses
))
347 inode
->i_fop
= &v9fs_dir_operations_dotl
;
349 inode
->i_fop
= &v9fs_dir_operations
;
353 p9_debug(P9_DEBUG_ERROR
, "BAD mode 0x%hx S_IFMT 0x%x\n",
354 mode
, mode
& S_IFMT
);
364 * v9fs_get_inode - helper function to setup an inode
366 * @mode: mode to setup inode with
370 struct inode
*v9fs_get_inode(struct super_block
*sb
, umode_t mode
, dev_t rdev
)
374 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
376 p9_debug(P9_DEBUG_VFS
, "super block: %p mode: %ho\n", sb
, mode
);
378 inode
= new_inode(sb
);
380 pr_warn("%s (%d): Problem allocating inode\n",
381 __func__
, task_pid_nr(current
));
382 return ERR_PTR(-ENOMEM
);
384 err
= v9fs_init_inode(v9ses
, inode
, mode
, rdev
);
393 static struct v9fs_fid*
394 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
398 struct v9fs_fid *ret;
399 struct v9fs_fcall *fcall;
401 nfid = v9fs_get_idpool(&v9ses->fidpool);
403 eprintk(KERN_WARNING, "no free fids available\n");
404 return ERR_PTR(-ENOSPC);
407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
411 if (fcall && fcall->id == RWALK)
414 PRINT_FCALL_ERROR("walk error", fcall);
415 v9fs_put_idpool(nfid, &v9ses->fidpool);
421 ret = v9fs_fid_create(v9ses, nfid);
427 err = v9fs_fid_insert(ret, dentry);
429 v9fs_fid_destroy(ret);
436 v9fs_t_clunk(v9ses, nfid);
446 * v9fs_clear_inode - release an inode
447 * @inode: inode to release
450 void v9fs_evict_inode(struct inode
*inode
)
452 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
454 truncate_inode_pages_final(&inode
->i_data
);
456 filemap_fdatawrite(&inode
->i_data
);
458 v9fs_cache_inode_put_cookie(inode
);
459 /* clunk the fid stashed in writeback_fid */
460 if (v9inode
->writeback_fid
) {
461 p9_client_clunk(v9inode
->writeback_fid
);
462 v9inode
->writeback_fid
= NULL
;
466 static int v9fs_test_inode(struct inode
*inode
, void *data
)
470 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
471 struct p9_wstat
*st
= (struct p9_wstat
*)data
;
472 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(inode
);
474 umode
= p9mode2unixmode(v9ses
, st
, &rdev
);
475 /* don't match inode of different type */
476 if ((inode
->i_mode
& S_IFMT
) != (umode
& S_IFMT
))
479 /* compare qid details */
480 if (memcmp(&v9inode
->qid
.version
,
481 &st
->qid
.version
, sizeof(v9inode
->qid
.version
)))
484 if (v9inode
->qid
.type
!= st
->qid
.type
)
487 if (v9inode
->qid
.path
!= st
->qid
.path
)
492 static int v9fs_test_new_inode(struct inode
*inode
, void *data
)
497 static int v9fs_set_inode(struct inode
*inode
, void *data
)
499 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
500 struct p9_wstat
*st
= (struct p9_wstat
*)data
;
502 memcpy(&v9inode
->qid
, &st
->qid
, sizeof(st
->qid
));
506 static struct inode
*v9fs_qid_iget(struct super_block
*sb
,
516 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
517 int (*test
)(struct inode
*, void *);
520 test
= v9fs_test_new_inode
;
522 test
= v9fs_test_inode
;
524 i_ino
= v9fs_qid2ino(qid
);
525 inode
= iget5_locked(sb
, i_ino
, test
, v9fs_set_inode
, st
);
527 return ERR_PTR(-ENOMEM
);
528 if (!(inode
->i_state
& I_NEW
))
531 * initialize the inode with the stat info
532 * FIXME!! we may need support for stale inodes
535 inode
->i_ino
= i_ino
;
536 umode
= p9mode2unixmode(v9ses
, st
, &rdev
);
537 retval
= v9fs_init_inode(v9ses
, inode
, umode
, rdev
);
541 v9fs_stat2inode(st
, inode
, sb
);
542 v9fs_cache_inode_get_cookie(inode
);
543 unlock_new_inode(inode
);
547 return ERR_PTR(retval
);
552 v9fs_inode_from_fid(struct v9fs_session_info
*v9ses
, struct p9_fid
*fid
,
553 struct super_block
*sb
, int new)
556 struct inode
*inode
= NULL
;
558 st
= p9_client_stat(fid
);
562 inode
= v9fs_qid_iget(sb
, &st
->qid
, st
, new);
569 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
571 * @flags: flags to convert
573 static int v9fs_at_to_dotl_flags(int flags
)
576 if (flags
& AT_REMOVEDIR
)
577 rflags
|= P9_DOTL_AT_REMOVEDIR
;
582 * v9fs_remove - helper function to remove files and directories
583 * @dir: directory inode that is being deleted
584 * @dentry: dentry that is being deleted
585 * @flags: removing a directory
589 static int v9fs_remove(struct inode
*dir
, struct dentry
*dentry
, int flags
)
592 int retval
= -EOPNOTSUPP
;
593 struct p9_fid
*v9fid
, *dfid
;
594 struct v9fs_session_info
*v9ses
;
596 p9_debug(P9_DEBUG_VFS
, "inode: %p dentry: %p rmdir: %x\n",
599 v9ses
= v9fs_inode2v9ses(dir
);
600 inode
= d_inode(dentry
);
601 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
603 retval
= PTR_ERR(dfid
);
604 p9_debug(P9_DEBUG_VFS
, "fid lookup failed %d\n", retval
);
607 if (v9fs_proto_dotl(v9ses
))
608 retval
= p9_client_unlinkat(dfid
, dentry
->d_name
.name
,
609 v9fs_at_to_dotl_flags(flags
));
610 if (retval
== -EOPNOTSUPP
) {
611 /* Try the one based on path */
612 v9fid
= v9fs_fid_clone(dentry
);
614 return PTR_ERR(v9fid
);
615 retval
= p9_client_remove(v9fid
);
619 * directories on unlink should have zero
622 if (flags
& AT_REMOVEDIR
) {
628 v9fs_invalidate_inode_attr(inode
);
629 v9fs_invalidate_inode_attr(dir
);
635 * v9fs_create - Create a file
636 * @v9ses: session information
637 * @dir: directory that dentry is being created in
638 * @dentry: dentry that is being created
639 * @extension: 9p2000.u extension string to support devices, etc.
640 * @perm: create permissions
644 static struct p9_fid
*
645 v9fs_create(struct v9fs_session_info
*v9ses
, struct inode
*dir
,
646 struct dentry
*dentry
, char *extension
, u32 perm
, u8 mode
)
650 struct p9_fid
*dfid
, *ofid
, *fid
;
653 p9_debug(P9_DEBUG_VFS
, "name %pd\n", dentry
);
658 name
= (char *) dentry
->d_name
.name
;
659 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
662 p9_debug(P9_DEBUG_VFS
, "fid lookup failed %d\n", err
);
666 /* clone a fid to use for creation */
667 ofid
= p9_client_walk(dfid
, 0, NULL
, 1);
670 p9_debug(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
674 err
= p9_client_fcreate(ofid
, name
, perm
, mode
, extension
);
676 p9_debug(P9_DEBUG_VFS
, "p9_client_fcreate failed %d\n", err
);
680 if (!(perm
& P9_DMLINK
)) {
681 /* now walk from the parent so we can get unopened fid */
682 fid
= p9_client_walk(dfid
, 1, &name
, 1);
685 p9_debug(P9_DEBUG_VFS
,
686 "p9_client_walk failed %d\n", err
);
691 * instantiate inode and assign the unopened fid to the dentry
693 inode
= v9fs_get_new_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
695 err
= PTR_ERR(inode
);
696 p9_debug(P9_DEBUG_VFS
,
697 "inode creation failed %d\n", err
);
700 v9fs_fid_add(dentry
, fid
);
701 d_instantiate(dentry
, inode
);
706 p9_client_clunk(ofid
);
709 p9_client_clunk(fid
);
715 * v9fs_vfs_create - VFS hook to create a regular file
717 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
720 * @dir: directory inode that is being created
721 * @dentry: dentry that is being deleted
722 * @mode: create permissions
727 v9fs_vfs_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
,
730 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(dir
);
731 u32 perm
= unixmode2p9mode(v9ses
, mode
);
735 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
, P9_ORDWR
);
739 v9fs_invalidate_inode_attr(dir
);
740 p9_client_clunk(fid
);
746 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
747 * @dir: inode that is being unlinked
748 * @dentry: dentry that is being unlinked
749 * @mode: mode for new directory
753 static int v9fs_vfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
758 struct v9fs_session_info
*v9ses
;
760 p9_debug(P9_DEBUG_VFS
, "name %pd\n", dentry
);
762 v9ses
= v9fs_inode2v9ses(dir
);
763 perm
= unixmode2p9mode(v9ses
, mode
| S_IFDIR
);
764 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
, P9_OREAD
);
770 v9fs_invalidate_inode_attr(dir
);
774 p9_client_clunk(fid
);
780 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
781 * @dir: inode that is being walked from
782 * @dentry: dentry that is being walked to?
783 * @flags: lookup flags (unused)
787 struct dentry
*v9fs_vfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
791 struct v9fs_session_info
*v9ses
;
792 struct p9_fid
*dfid
, *fid
;
796 p9_debug(P9_DEBUG_VFS
, "dir: %p dentry: (%pd) %p flags: %x\n",
797 dir
, dentry
, dentry
, flags
);
799 if (dentry
->d_name
.len
> NAME_MAX
)
800 return ERR_PTR(-ENAMETOOLONG
);
802 v9ses
= v9fs_inode2v9ses(dir
);
803 /* We can walk d_parent because we hold the dir->i_mutex */
804 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
806 return ERR_CAST(dfid
);
808 name
= (char *) dentry
->d_name
.name
;
809 fid
= p9_client_walk(dfid
, 1, &name
, 1);
811 if (fid
== ERR_PTR(-ENOENT
)) {
815 return ERR_CAST(fid
);
818 * Make sure we don't use a wrong inode due to parallel
819 * unlink. For cached mode create calls request for new
820 * inode. But with cache disabled, lookup should do this.
822 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
)
823 inode
= v9fs_get_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
825 inode
= v9fs_get_new_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
827 p9_client_clunk(fid
);
828 return ERR_CAST(inode
);
831 * If we had a rename on the server and a parallel lookup
832 * for the new name, then make sure we instantiate with
833 * the new name. ie look up for a/b, while on server somebody
834 * moved b under k and client parallely did a lookup for
837 res
= d_splice_alias(inode
, dentry
);
839 v9fs_fid_add(dentry
, fid
);
840 else if (!IS_ERR(res
))
841 v9fs_fid_add(res
, fid
);
843 p9_client_clunk(fid
);
848 v9fs_vfs_atomic_open(struct inode
*dir
, struct dentry
*dentry
,
849 struct file
*file
, unsigned flags
, umode_t mode
,
854 struct v9fs_inode
*v9inode
;
855 struct v9fs_session_info
*v9ses
;
856 struct p9_fid
*fid
, *inode_fid
;
857 struct dentry
*res
= NULL
;
859 if (d_unhashed(dentry
)) {
860 res
= v9fs_vfs_lookup(dir
, dentry
, 0);
869 if (!(flags
& O_CREAT
) || d_really_is_positive(dentry
))
870 return finish_no_open(file
, res
);
874 v9ses
= v9fs_inode2v9ses(dir
);
875 perm
= unixmode2p9mode(v9ses
, mode
);
876 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
,
877 v9fs_uflags2omode(flags
,
878 v9fs_proto_dotu(v9ses
)));
885 v9fs_invalidate_inode_attr(dir
);
886 v9inode
= V9FS_I(d_inode(dentry
));
887 mutex_lock(&v9inode
->v_mutex
);
888 if ((v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
) &&
889 !v9inode
->writeback_fid
&&
890 ((flags
& O_ACCMODE
) != O_RDONLY
)) {
892 * clone a fid and add it to writeback_fid
893 * we do it during open time instead of
894 * page dirty time via write_begin/page_mkwrite
895 * because we want write after unlink usecase
898 inode_fid
= v9fs_writeback_fid(dentry
);
899 if (IS_ERR(inode_fid
)) {
900 err
= PTR_ERR(inode_fid
);
901 mutex_unlock(&v9inode
->v_mutex
);
904 v9inode
->writeback_fid
= (void *) inode_fid
;
906 mutex_unlock(&v9inode
->v_mutex
);
907 err
= finish_open(file
, dentry
, generic_file_open
, opened
);
911 file
->private_data
= fid
;
912 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
)
913 v9fs_cache_inode_set_cookie(d_inode(dentry
), file
);
915 *opened
|= FILE_CREATED
;
922 p9_client_clunk(fid
);
927 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
928 * @i: inode that is being unlinked
929 * @d: dentry that is being unlinked
933 int v9fs_vfs_unlink(struct inode
*i
, struct dentry
*d
)
935 return v9fs_remove(i
, d
, 0);
939 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
940 * @i: inode that is being unlinked
941 * @d: dentry that is being unlinked
945 int v9fs_vfs_rmdir(struct inode
*i
, struct dentry
*d
)
947 return v9fs_remove(i
, d
, AT_REMOVEDIR
);
951 * v9fs_vfs_rename - VFS hook to rename an inode
952 * @old_dir: old dir inode
953 * @old_dentry: old dentry
954 * @new_dir: new dir inode
955 * @new_dentry: new dentry
960 v9fs_vfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
961 struct inode
*new_dir
, struct dentry
*new_dentry
)
964 struct inode
*old_inode
;
965 struct inode
*new_inode
;
966 struct v9fs_session_info
*v9ses
;
967 struct p9_fid
*oldfid
;
968 struct p9_fid
*olddirfid
;
969 struct p9_fid
*newdirfid
;
970 struct p9_wstat wstat
;
972 p9_debug(P9_DEBUG_VFS
, "\n");
974 old_inode
= d_inode(old_dentry
);
975 new_inode
= d_inode(new_dentry
);
976 v9ses
= v9fs_inode2v9ses(old_inode
);
977 oldfid
= v9fs_fid_lookup(old_dentry
);
979 return PTR_ERR(oldfid
);
981 olddirfid
= v9fs_fid_clone(old_dentry
->d_parent
);
982 if (IS_ERR(olddirfid
)) {
983 retval
= PTR_ERR(olddirfid
);
987 newdirfid
= v9fs_fid_clone(new_dentry
->d_parent
);
988 if (IS_ERR(newdirfid
)) {
989 retval
= PTR_ERR(newdirfid
);
993 down_write(&v9ses
->rename_sem
);
994 if (v9fs_proto_dotl(v9ses
)) {
995 retval
= p9_client_renameat(olddirfid
, old_dentry
->d_name
.name
,
996 newdirfid
, new_dentry
->d_name
.name
);
997 if (retval
== -EOPNOTSUPP
)
998 retval
= p9_client_rename(oldfid
, newdirfid
,
999 new_dentry
->d_name
.name
);
1000 if (retval
!= -EOPNOTSUPP
)
1003 if (old_dentry
->d_parent
!= new_dentry
->d_parent
) {
1005 * 9P .u can only handle file rename in the same directory
1008 p9_debug(P9_DEBUG_ERROR
, "old dir and new dir are different\n");
1012 v9fs_blank_wstat(&wstat
);
1013 wstat
.muid
= v9ses
->uname
;
1014 wstat
.name
= (char *) new_dentry
->d_name
.name
;
1015 retval
= p9_client_wstat(oldfid
, &wstat
);
1020 if (S_ISDIR(new_inode
->i_mode
))
1021 clear_nlink(new_inode
);
1023 drop_nlink(new_inode
);
1025 if (S_ISDIR(old_inode
->i_mode
)) {
1028 drop_nlink(old_dir
);
1030 v9fs_invalidate_inode_attr(old_inode
);
1031 v9fs_invalidate_inode_attr(old_dir
);
1032 v9fs_invalidate_inode_attr(new_dir
);
1034 /* successful rename */
1035 d_move(old_dentry
, new_dentry
);
1037 up_write(&v9ses
->rename_sem
);
1038 p9_client_clunk(newdirfid
);
1041 p9_client_clunk(olddirfid
);
1048 * v9fs_vfs_getattr - retrieve file metadata
1049 * @mnt: mount information
1050 * @dentry: file to get attributes on
1051 * @stat: metadata structure to populate
1056 v9fs_vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
1059 struct v9fs_session_info
*v9ses
;
1061 struct p9_wstat
*st
;
1063 p9_debug(P9_DEBUG_VFS
, "dentry: %p\n", dentry
);
1064 v9ses
= v9fs_dentry2v9ses(dentry
);
1065 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
) {
1066 generic_fillattr(d_inode(dentry
), stat
);
1069 fid
= v9fs_fid_lookup(dentry
);
1071 return PTR_ERR(fid
);
1073 st
= p9_client_stat(fid
);
1077 v9fs_stat2inode(st
, d_inode(dentry
), d_inode(dentry
)->i_sb
);
1078 generic_fillattr(d_inode(dentry
), stat
);
1086 * v9fs_vfs_setattr - set file metadata
1087 * @dentry: file whose metadata to set
1088 * @iattr: metadata assignment structure
1092 static int v9fs_vfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1095 struct v9fs_session_info
*v9ses
;
1097 struct p9_wstat wstat
;
1099 p9_debug(P9_DEBUG_VFS
, "\n");
1100 retval
= inode_change_ok(d_inode(dentry
), iattr
);
1105 v9ses
= v9fs_dentry2v9ses(dentry
);
1106 fid
= v9fs_fid_lookup(dentry
);
1108 return PTR_ERR(fid
);
1110 v9fs_blank_wstat(&wstat
);
1111 if (iattr
->ia_valid
& ATTR_MODE
)
1112 wstat
.mode
= unixmode2p9mode(v9ses
, iattr
->ia_mode
);
1114 if (iattr
->ia_valid
& ATTR_MTIME
)
1115 wstat
.mtime
= iattr
->ia_mtime
.tv_sec
;
1117 if (iattr
->ia_valid
& ATTR_ATIME
)
1118 wstat
.atime
= iattr
->ia_atime
.tv_sec
;
1120 if (iattr
->ia_valid
& ATTR_SIZE
)
1121 wstat
.length
= iattr
->ia_size
;
1123 if (v9fs_proto_dotu(v9ses
)) {
1124 if (iattr
->ia_valid
& ATTR_UID
)
1125 wstat
.n_uid
= iattr
->ia_uid
;
1127 if (iattr
->ia_valid
& ATTR_GID
)
1128 wstat
.n_gid
= iattr
->ia_gid
;
1131 /* Write all dirty data */
1132 if (d_is_reg(dentry
))
1133 filemap_write_and_wait(d_inode(dentry
)->i_mapping
);
1135 retval
= p9_client_wstat(fid
, &wstat
);
1139 if ((iattr
->ia_valid
& ATTR_SIZE
) &&
1140 iattr
->ia_size
!= i_size_read(d_inode(dentry
)))
1141 truncate_setsize(d_inode(dentry
), iattr
->ia_size
);
1143 v9fs_invalidate_inode_attr(d_inode(dentry
));
1145 setattr_copy(d_inode(dentry
), iattr
);
1146 mark_inode_dirty(d_inode(dentry
));
1151 * v9fs_stat2inode - populate an inode structure with mistat info
1152 * @stat: Plan 9 metadata (mistat) structure
1153 * @inode: inode to populate
1154 * @sb: superblock of filesystem
1159 v9fs_stat2inode(struct p9_wstat
*stat
, struct inode
*inode
,
1160 struct super_block
*sb
)
1165 unsigned int i_nlink
;
1166 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
1167 struct v9fs_inode
*v9inode
= V9FS_I(inode
);
1169 set_nlink(inode
, 1);
1171 inode
->i_atime
.tv_sec
= stat
->atime
;
1172 inode
->i_mtime
.tv_sec
= stat
->mtime
;
1173 inode
->i_ctime
.tv_sec
= stat
->mtime
;
1175 inode
->i_uid
= v9ses
->dfltuid
;
1176 inode
->i_gid
= v9ses
->dfltgid
;
1178 if (v9fs_proto_dotu(v9ses
)) {
1179 inode
->i_uid
= stat
->n_uid
;
1180 inode
->i_gid
= stat
->n_gid
;
1182 if ((S_ISREG(inode
->i_mode
)) || (S_ISDIR(inode
->i_mode
))) {
1183 if (v9fs_proto_dotu(v9ses
) && (stat
->extension
[0] != '\0')) {
1185 * Hadlink support got added later to
1186 * to the .u extension. So there can be
1187 * server out there that doesn't support
1188 * this even with .u extension. So check
1189 * for non NULL stat->extension
1191 strlcpy(ext
, stat
->extension
, sizeof(ext
));
1192 /* HARDLINKCOUNT %u */
1193 sscanf(ext
, "%13s %u", tag_name
, &i_nlink
);
1194 if (!strncmp(tag_name
, "HARDLINKCOUNT", 13))
1195 set_nlink(inode
, i_nlink
);
1198 mode
= p9mode2perm(v9ses
, stat
);
1199 mode
|= inode
->i_mode
& ~S_IALLUGO
;
1200 inode
->i_mode
= mode
;
1201 i_size_write(inode
, stat
->length
);
1203 /* not real number of blocks, but 512 byte ones ... */
1204 inode
->i_blocks
= (i_size_read(inode
) + 512 - 1) >> 9;
1205 v9inode
->cache_validity
&= ~V9FS_INO_INVALID_ATTR
;
1209 * v9fs_qid2ino - convert qid into inode number
1212 * BUG: potential for inode number collisions?
1215 ino_t
v9fs_qid2ino(struct p9_qid
*qid
)
1217 u64 path
= qid
->path
+ 2;
1220 if (sizeof(ino_t
) == sizeof(path
))
1221 memcpy(&i
, &path
, sizeof(ino_t
));
1223 i
= (ino_t
) (path
^ (path
>> 32));
1229 * v9fs_vfs_follow_link - follow a symlink path
1230 * @dentry: dentry for symlink
1231 * @cookie: place to pass the data to put_link()
1234 static const char *v9fs_vfs_follow_link(struct dentry
*dentry
, void **cookie
)
1236 struct v9fs_session_info
*v9ses
= v9fs_dentry2v9ses(dentry
);
1237 struct p9_fid
*fid
= v9fs_fid_lookup(dentry
);
1238 struct p9_wstat
*st
;
1241 p9_debug(P9_DEBUG_VFS
, "%pd\n", dentry
);
1244 return ERR_CAST(fid
);
1246 if (!v9fs_proto_dotu(v9ses
))
1247 return ERR_PTR(-EBADF
);
1249 st
= p9_client_stat(fid
);
1251 return ERR_CAST(st
);
1253 if (!(st
->mode
& P9_DMSYMLINK
)) {
1256 return ERR_PTR(-EINVAL
);
1258 res
= st
->extension
;
1259 st
->extension
= NULL
;
1260 if (strlen(res
) >= PATH_MAX
)
1261 res
[PATH_MAX
- 1] = '\0';
1265 return *cookie
= res
;
1269 * v9fs_vfs_mkspecial - create a special file
1270 * @dir: inode to create special file in
1271 * @dentry: dentry to create
1272 * @perm: mode to create special file
1273 * @extension: 9p2000.u format extension string representing special file
1277 static int v9fs_vfs_mkspecial(struct inode
*dir
, struct dentry
*dentry
,
1278 u32 perm
, const char *extension
)
1281 struct v9fs_session_info
*v9ses
;
1283 v9ses
= v9fs_inode2v9ses(dir
);
1284 if (!v9fs_proto_dotu(v9ses
)) {
1285 p9_debug(P9_DEBUG_ERROR
, "not extended\n");
1289 fid
= v9fs_create(v9ses
, dir
, dentry
, (char *) extension
, perm
,
1292 return PTR_ERR(fid
);
1294 v9fs_invalidate_inode_attr(dir
);
1295 p9_client_clunk(fid
);
1300 * v9fs_vfs_symlink - helper function to create symlinks
1301 * @dir: directory inode containing symlink
1302 * @dentry: dentry for symlink
1303 * @symname: symlink data
1305 * See Also: 9P2000.u RFC for more information
1310 v9fs_vfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1312 p9_debug(P9_DEBUG_VFS
, " %lu,%pd,%s\n",
1313 dir
->i_ino
, dentry
, symname
);
1315 return v9fs_vfs_mkspecial(dir
, dentry
, P9_DMSYMLINK
, symname
);
1318 #define U32_MAX_DIGITS 10
1321 * v9fs_vfs_link - create a hardlink
1322 * @old_dentry: dentry for file to link to
1323 * @dir: inode destination for new link
1324 * @dentry: dentry for link
1329 v9fs_vfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1330 struct dentry
*dentry
)
1333 char name
[1 + U32_MAX_DIGITS
+ 2]; /* sign + number + \n + \0 */
1334 struct p9_fid
*oldfid
;
1336 p9_debug(P9_DEBUG_VFS
, " %lu,%pd,%pd\n",
1337 dir
->i_ino
, dentry
, old_dentry
);
1339 oldfid
= v9fs_fid_clone(old_dentry
);
1341 return PTR_ERR(oldfid
);
1343 sprintf(name
, "%d\n", oldfid
->fid
);
1344 retval
= v9fs_vfs_mkspecial(dir
, dentry
, P9_DMLINK
, name
);
1346 v9fs_refresh_inode(oldfid
, d_inode(old_dentry
));
1347 v9fs_invalidate_inode_attr(dir
);
1349 p9_client_clunk(oldfid
);
1354 * v9fs_vfs_mknod - create a special file
1355 * @dir: inode destination for new link
1356 * @dentry: dentry for file
1357 * @mode: mode for creation
1358 * @rdev: device associated with special file
1363 v9fs_vfs_mknod(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
, dev_t rdev
)
1365 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(dir
);
1367 char name
[2 + U32_MAX_DIGITS
+ 1 + U32_MAX_DIGITS
+ 1];
1370 p9_debug(P9_DEBUG_VFS
, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1371 dir
->i_ino
, dentry
, mode
,
1372 MAJOR(rdev
), MINOR(rdev
));
1374 /* build extension */
1376 sprintf(name
, "b %u %u", MAJOR(rdev
), MINOR(rdev
));
1377 else if (S_ISCHR(mode
))
1378 sprintf(name
, "c %u %u", MAJOR(rdev
), MINOR(rdev
));
1382 perm
= unixmode2p9mode(v9ses
, mode
);
1383 retval
= v9fs_vfs_mkspecial(dir
, dentry
, perm
, name
);
1388 int v9fs_refresh_inode(struct p9_fid
*fid
, struct inode
*inode
)
1393 struct p9_wstat
*st
;
1394 struct v9fs_session_info
*v9ses
;
1396 v9ses
= v9fs_inode2v9ses(inode
);
1397 st
= p9_client_stat(fid
);
1401 * Don't update inode if the file type is different
1403 umode
= p9mode2unixmode(v9ses
, st
, &rdev
);
1404 if ((inode
->i_mode
& S_IFMT
) != (umode
& S_IFMT
))
1407 spin_lock(&inode
->i_lock
);
1409 * We don't want to refresh inode->i_size,
1410 * because we may have cached data
1412 i_size
= inode
->i_size
;
1413 v9fs_stat2inode(st
, inode
, inode
->i_sb
);
1414 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
)
1415 inode
->i_size
= i_size
;
1416 spin_unlock(&inode
->i_lock
);
1423 static const struct inode_operations v9fs_dir_inode_operations_dotu
= {
1424 .create
= v9fs_vfs_create
,
1425 .lookup
= v9fs_vfs_lookup
,
1426 .atomic_open
= v9fs_vfs_atomic_open
,
1427 .symlink
= v9fs_vfs_symlink
,
1428 .link
= v9fs_vfs_link
,
1429 .unlink
= v9fs_vfs_unlink
,
1430 .mkdir
= v9fs_vfs_mkdir
,
1431 .rmdir
= v9fs_vfs_rmdir
,
1432 .mknod
= v9fs_vfs_mknod
,
1433 .rename
= v9fs_vfs_rename
,
1434 .getattr
= v9fs_vfs_getattr
,
1435 .setattr
= v9fs_vfs_setattr
,
1438 static const struct inode_operations v9fs_dir_inode_operations
= {
1439 .create
= v9fs_vfs_create
,
1440 .lookup
= v9fs_vfs_lookup
,
1441 .atomic_open
= v9fs_vfs_atomic_open
,
1442 .unlink
= v9fs_vfs_unlink
,
1443 .mkdir
= v9fs_vfs_mkdir
,
1444 .rmdir
= v9fs_vfs_rmdir
,
1445 .mknod
= v9fs_vfs_mknod
,
1446 .rename
= v9fs_vfs_rename
,
1447 .getattr
= v9fs_vfs_getattr
,
1448 .setattr
= v9fs_vfs_setattr
,
1451 static const struct inode_operations v9fs_file_inode_operations
= {
1452 .getattr
= v9fs_vfs_getattr
,
1453 .setattr
= v9fs_vfs_setattr
,
1456 static const struct inode_operations v9fs_symlink_inode_operations
= {
1457 .readlink
= generic_readlink
,
1458 .follow_link
= v9fs_vfs_follow_link
,
1459 .put_link
= kfree_put_link
,
1460 .getattr
= v9fs_vfs_getattr
,
1461 .setattr
= v9fs_vfs_setattr
,