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 strncpy(ext, stat->extension, sizeof(ext));
150 sscanf(ext, "%c %u %u", &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)
195 if (uflags & O_TRUNC)
202 if (uflags & O_APPEND)
210 * v9fs_blank_wstat - helper function to setup a 9P stat structure
211 * @wstat: structure to initialize
216 v9fs_blank_wstat(struct p9_wstat *wstat)
220 wstat->qid.type = ~0;
221 wstat->qid.version = ~0;
222 *((long long *)&wstat->qid.path) = ~0;
234 wstat->extension = NULL;
238 * v9fs_alloc_inode - helper function to allocate an inode
241 struct inode *v9fs_alloc_inode(struct super_block *sb)
243 struct v9fs_inode *v9inode;
244 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
248 #ifdef CONFIG_9P_FSCACHE
249 v9inode->fscache = NULL;
250 spin_lock_init(&v9inode->fscache_lock);
252 v9inode->writeback_fid = NULL;
253 v9inode->cache_validity = 0;
254 mutex_init(&v9inode->v_mutex);
255 return &v9inode->vfs_inode;
259 * v9fs_destroy_inode - destroy an inode
263 static void v9fs_i_callback(struct rcu_head *head)
265 struct inode *inode = container_of(head, struct inode, i_rcu);
266 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
269 void v9fs_destroy_inode(struct inode *inode)
271 call_rcu(&inode->i_rcu, v9fs_i_callback);
274 int v9fs_init_inode(struct v9fs_session_info *v9ses,
275 struct inode *inode, umode_t mode, dev_t rdev)
279 inode_init_owner(inode, NULL, mode);
281 inode->i_rdev = rdev;
282 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
283 inode->i_mapping->a_ops = &v9fs_addr_operations;
285 switch (mode & S_IFMT) {
290 if (v9fs_proto_dotl(v9ses)) {
291 inode->i_op = &v9fs_file_inode_operations_dotl;
292 } else if (v9fs_proto_dotu(v9ses)) {
293 inode->i_op = &v9fs_file_inode_operations;
295 p9_debug(P9_DEBUG_ERROR,
296 "special files without extended mode\n");
300 init_special_inode(inode, inode->i_mode, inode->i_rdev);
303 if (v9fs_proto_dotl(v9ses)) {
304 inode->i_op = &v9fs_file_inode_operations_dotl;
307 &v9fs_cached_file_operations_dotl;
309 inode->i_fop = &v9fs_file_operations_dotl;
311 inode->i_op = &v9fs_file_inode_operations;
313 inode->i_fop = &v9fs_cached_file_operations;
315 inode->i_fop = &v9fs_file_operations;
320 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
321 p9_debug(P9_DEBUG_ERROR,
322 "extended modes used with legacy protocol\n");
327 if (v9fs_proto_dotl(v9ses))
328 inode->i_op = &v9fs_symlink_inode_operations_dotl;
330 inode->i_op = &v9fs_symlink_inode_operations;
335 if (v9fs_proto_dotl(v9ses))
336 inode->i_op = &v9fs_dir_inode_operations_dotl;
337 else if (v9fs_proto_dotu(v9ses))
338 inode->i_op = &v9fs_dir_inode_operations_dotu;
340 inode->i_op = &v9fs_dir_inode_operations;
342 if (v9fs_proto_dotl(v9ses))
343 inode->i_fop = &v9fs_dir_operations_dotl;
345 inode->i_fop = &v9fs_dir_operations;
349 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
350 mode, mode & S_IFMT);
360 * v9fs_get_inode - helper function to setup an inode
362 * @mode: mode to setup inode with
366 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
370 struct v9fs_session_info *v9ses = sb->s_fs_info;
372 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
374 inode = new_inode(sb);
376 pr_warn("%s (%d): Problem allocating inode\n",
377 __func__, task_pid_nr(current));
378 return ERR_PTR(-ENOMEM);
380 err = v9fs_init_inode(v9ses, inode, mode, rdev);
389 static struct v9fs_fid*
390 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
394 struct v9fs_fid *ret;
395 struct v9fs_fcall *fcall;
397 nfid = v9fs_get_idpool(&v9ses->fidpool);
399 eprintk(KERN_WARNING, "no free fids available\n");
400 return ERR_PTR(-ENOSPC);
403 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
407 if (fcall && fcall->id == RWALK)
410 PRINT_FCALL_ERROR("walk error", fcall);
411 v9fs_put_idpool(nfid, &v9ses->fidpool);
417 ret = v9fs_fid_create(v9ses, nfid);
423 err = v9fs_fid_insert(ret, dentry);
425 v9fs_fid_destroy(ret);
432 v9fs_t_clunk(v9ses, nfid);
442 * v9fs_clear_inode - release an inode
443 * @inode: inode to release
446 void v9fs_evict_inode(struct inode *inode)
448 struct v9fs_inode *v9inode = V9FS_I(inode);
450 truncate_inode_pages(inode->i_mapping, 0);
452 filemap_fdatawrite(inode->i_mapping);
454 #ifdef CONFIG_9P_FSCACHE
455 v9fs_cache_inode_put_cookie(inode);
457 /* clunk the fid stashed in writeback_fid */
458 if (v9inode->writeback_fid) {
459 p9_client_clunk(v9inode->writeback_fid);
460 v9inode->writeback_fid = NULL;
464 static int v9fs_test_inode(struct inode *inode, void *data)
468 struct v9fs_inode *v9inode = V9FS_I(inode);
469 struct p9_wstat *st = (struct p9_wstat *)data;
470 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
472 umode = p9mode2unixmode(v9ses, st, &rdev);
473 /* don't match inode of different type */
474 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
477 /* compare qid details */
478 if (memcmp(&v9inode->qid.version,
479 &st->qid.version, sizeof(v9inode->qid.version)))
482 if (v9inode->qid.type != st->qid.type)
487 static int v9fs_test_new_inode(struct inode *inode, void *data)
492 static int v9fs_set_inode(struct inode *inode, void *data)
494 struct v9fs_inode *v9inode = V9FS_I(inode);
495 struct p9_wstat *st = (struct p9_wstat *)data;
497 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
501 static struct inode *v9fs_qid_iget(struct super_block *sb,
511 struct v9fs_session_info *v9ses = sb->s_fs_info;
512 int (*test)(struct inode *, void *);
515 test = v9fs_test_new_inode;
517 test = v9fs_test_inode;
519 i_ino = v9fs_qid2ino(qid);
520 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
522 return ERR_PTR(-ENOMEM);
523 if (!(inode->i_state & I_NEW))
526 * initialize the inode with the stat info
527 * FIXME!! we may need support for stale inodes
530 inode->i_ino = i_ino;
531 umode = p9mode2unixmode(v9ses, st, &rdev);
532 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
536 v9fs_stat2inode(st, inode, sb);
537 #ifdef CONFIG_9P_FSCACHE
538 v9fs_cache_inode_get_cookie(inode);
540 unlock_new_inode(inode);
543 unlock_new_inode(inode);
545 return ERR_PTR(retval);
550 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
551 struct super_block *sb, int new)
554 struct inode *inode = NULL;
556 st = p9_client_stat(fid);
560 inode = v9fs_qid_iget(sb, &st->qid, st, new);
567 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
569 * @flags: flags to convert
571 static int v9fs_at_to_dotl_flags(int flags)
574 if (flags & AT_REMOVEDIR)
575 rflags |= P9_DOTL_AT_REMOVEDIR;
580 * v9fs_remove - helper function to remove files and directories
581 * @dir: directory inode that is being deleted
582 * @dentry: dentry that is being deleted
583 * @rmdir: removing a directory
587 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
590 int retval = -EOPNOTSUPP;
591 struct p9_fid *v9fid, *dfid;
592 struct v9fs_session_info *v9ses;
594 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
597 v9ses = v9fs_inode2v9ses(dir);
598 inode = dentry->d_inode;
599 dfid = v9fs_fid_lookup(dentry->d_parent);
601 retval = PTR_ERR(dfid);
602 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
605 if (v9fs_proto_dotl(v9ses))
606 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
607 v9fs_at_to_dotl_flags(flags));
608 if (retval == -EOPNOTSUPP) {
609 /* Try the one based on path */
610 v9fid = v9fs_fid_clone(dentry);
612 return PTR_ERR(v9fid);
613 retval = p9_client_remove(v9fid);
617 * directories on unlink should have zero
620 if (flags & AT_REMOVEDIR) {
626 v9fs_invalidate_inode_attr(inode);
627 v9fs_invalidate_inode_attr(dir);
633 * v9fs_create - Create a file
634 * @v9ses: session information
635 * @dir: directory that dentry is being created in
636 * @dentry: dentry that is being created
637 * @extension: 9p2000.u extension string to support devices, etc.
638 * @perm: create permissions
642 static struct p9_fid *
643 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
644 struct dentry *dentry, char *extension, u32 perm, u8 mode)
648 struct p9_fid *dfid, *ofid, *fid;
651 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
656 name = (char *) dentry->d_name.name;
657 dfid = v9fs_fid_lookup(dentry->d_parent);
660 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
664 /* clone a fid to use for creation */
665 ofid = p9_client_walk(dfid, 0, NULL, 1);
668 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
672 err = p9_client_fcreate(ofid, name, perm, mode, extension);
674 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
678 if (!(perm & P9_DMLINK)) {
679 /* now walk from the parent so we can get unopened fid */
680 fid = p9_client_walk(dfid, 1, &name, 1);
683 p9_debug(P9_DEBUG_VFS,
684 "p9_client_walk failed %d\n", err);
689 * instantiate inode and assign the unopened fid to the dentry
691 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
693 err = PTR_ERR(inode);
694 p9_debug(P9_DEBUG_VFS,
695 "inode creation failed %d\n", err);
698 err = 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,
728 struct nameidata *nd)
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 %s\n", dentry->d_name.name);
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 * @nameidata: path data
787 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
788 struct nameidata *nameidata)
791 struct super_block *sb;
792 struct v9fs_session_info *v9ses;
793 struct p9_fid *dfid, *fid;
798 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
799 dir, dentry->d_name.name, dentry, nameidata);
801 if (dentry->d_name.len > NAME_MAX)
802 return ERR_PTR(-ENAMETOOLONG);
805 v9ses = v9fs_inode2v9ses(dir);
806 /* We can walk d_parent because we hold the dir->i_mutex */
807 dfid = v9fs_fid_lookup(dentry->d_parent);
809 return ERR_CAST(dfid);
811 name = (char *) dentry->d_name.name;
812 fid = p9_client_walk(dfid, 1, &name, 1);
814 result = PTR_ERR(fid);
815 if (result == -ENOENT) {
820 return ERR_PTR(result);
823 * Make sure we don't use a wrong inode due to parallel
824 * unlink. For cached mode create calls request for new
825 * inode. But with cache disabled, lookup should do this.
828 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
830 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
832 result = PTR_ERR(inode);
836 result = v9fs_fid_add(dentry, fid);
841 * If we had a rename on the server and a parallel lookup
842 * for the new name, then make sure we instantiate with
843 * the new name. ie look up for a/b, while on server somebody
844 * moved b under k and client parallely did a lookup for
847 res = d_materialise_unique(dentry, inode);
850 result = PTR_ERR(res);
854 p9_client_clunk(fid);
856 return ERR_PTR(result);
860 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
861 struct opendata *od, unsigned flags, umode_t mode,
867 struct v9fs_inode *v9inode;
868 struct v9fs_session_info *v9ses;
869 struct p9_fid *fid, *inode_fid;
870 struct dentry *res = NULL;
872 if (d_unhashed(dentry)) {
873 res = v9fs_vfs_lookup(dir, dentry, NULL);
875 return ERR_CAST(res);
882 if (!(flags & O_CREAT) || dentry->d_inode) {
883 finish_no_open(od, res);
889 v9ses = v9fs_inode2v9ses(dir);
890 perm = unixmode2p9mode(v9ses, mode);
891 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
892 v9fs_uflags2omode(flags,
893 v9fs_proto_dotu(v9ses)));
900 v9fs_invalidate_inode_attr(dir);
901 v9inode = V9FS_I(dentry->d_inode);
902 mutex_lock(&v9inode->v_mutex);
903 if (v9ses->cache && !v9inode->writeback_fid &&
904 ((flags & O_ACCMODE) != O_RDONLY)) {
906 * clone a fid and add it to writeback_fid
907 * we do it during open time instead of
908 * page dirty time via write_begin/page_mkwrite
909 * because we want write after unlink usecase
912 inode_fid = v9fs_writeback_fid(dentry);
913 if (IS_ERR(inode_fid)) {
914 err = PTR_ERR(inode_fid);
915 mutex_unlock(&v9inode->v_mutex);
918 v9inode->writeback_fid = (void *) inode_fid;
920 mutex_unlock(&v9inode->v_mutex);
921 filp = finish_open(od, dentry, generic_file_open);
927 filp->private_data = fid;
928 #ifdef CONFIG_9P_FSCACHE
930 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
940 p9_client_clunk(fid);
947 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
948 * @i: inode that is being unlinked
949 * @d: dentry that is being unlinked
953 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
955 return v9fs_remove(i, d, 0);
959 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
960 * @i: inode that is being unlinked
961 * @d: dentry that is being unlinked
965 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
967 return v9fs_remove(i, d, AT_REMOVEDIR);
971 * v9fs_vfs_rename - VFS hook to rename an inode
972 * @old_dir: old dir inode
973 * @old_dentry: old dentry
974 * @new_dir: new dir inode
975 * @new_dentry: new dentry
980 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
981 struct inode *new_dir, struct dentry *new_dentry)
984 struct inode *old_inode;
985 struct inode *new_inode;
986 struct v9fs_session_info *v9ses;
987 struct p9_fid *oldfid;
988 struct p9_fid *olddirfid;
989 struct p9_fid *newdirfid;
990 struct p9_wstat wstat;
992 p9_debug(P9_DEBUG_VFS, "\n");
994 old_inode = old_dentry->d_inode;
995 new_inode = new_dentry->d_inode;
996 v9ses = v9fs_inode2v9ses(old_inode);
997 oldfid = v9fs_fid_lookup(old_dentry);
999 return PTR_ERR(oldfid);
1001 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
1002 if (IS_ERR(olddirfid)) {
1003 retval = PTR_ERR(olddirfid);
1007 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
1008 if (IS_ERR(newdirfid)) {
1009 retval = PTR_ERR(newdirfid);
1013 down_write(&v9ses->rename_sem);
1014 if (v9fs_proto_dotl(v9ses)) {
1015 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
1016 newdirfid, new_dentry->d_name.name);
1017 if (retval == -EOPNOTSUPP)
1018 retval = p9_client_rename(oldfid, newdirfid,
1019 new_dentry->d_name.name);
1020 if (retval != -EOPNOTSUPP)
1023 if (old_dentry->d_parent != new_dentry->d_parent) {
1025 * 9P .u can only handle file rename in the same directory
1028 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1032 v9fs_blank_wstat(&wstat);
1033 wstat.muid = v9ses->uname;
1034 wstat.name = (char *) new_dentry->d_name.name;
1035 retval = p9_client_wstat(oldfid, &wstat);
1040 if (S_ISDIR(new_inode->i_mode))
1041 clear_nlink(new_inode);
1043 drop_nlink(new_inode);
1045 if (S_ISDIR(old_inode->i_mode)) {
1048 drop_nlink(old_dir);
1050 v9fs_invalidate_inode_attr(old_inode);
1051 v9fs_invalidate_inode_attr(old_dir);
1052 v9fs_invalidate_inode_attr(new_dir);
1054 /* successful rename */
1055 d_move(old_dentry, new_dentry);
1057 up_write(&v9ses->rename_sem);
1058 p9_client_clunk(newdirfid);
1061 p9_client_clunk(olddirfid);
1068 * v9fs_vfs_getattr - retrieve file metadata
1069 * @mnt: mount information
1070 * @dentry: file to get attributes on
1071 * @stat: metadata structure to populate
1076 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1080 struct v9fs_session_info *v9ses;
1082 struct p9_wstat *st;
1084 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1086 v9ses = v9fs_dentry2v9ses(dentry);
1087 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1088 generic_fillattr(dentry->d_inode, stat);
1091 fid = v9fs_fid_lookup(dentry);
1093 return PTR_ERR(fid);
1095 st = p9_client_stat(fid);
1099 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1100 generic_fillattr(dentry->d_inode, stat);
1108 * v9fs_vfs_setattr - set file metadata
1109 * @dentry: file whose metadata to set
1110 * @iattr: metadata assignment structure
1114 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1117 struct v9fs_session_info *v9ses;
1119 struct p9_wstat wstat;
1121 p9_debug(P9_DEBUG_VFS, "\n");
1122 retval = inode_change_ok(dentry->d_inode, iattr);
1127 v9ses = v9fs_dentry2v9ses(dentry);
1128 fid = v9fs_fid_lookup(dentry);
1130 return PTR_ERR(fid);
1132 v9fs_blank_wstat(&wstat);
1133 if (iattr->ia_valid & ATTR_MODE)
1134 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1136 if (iattr->ia_valid & ATTR_MTIME)
1137 wstat.mtime = iattr->ia_mtime.tv_sec;
1139 if (iattr->ia_valid & ATTR_ATIME)
1140 wstat.atime = iattr->ia_atime.tv_sec;
1142 if (iattr->ia_valid & ATTR_SIZE)
1143 wstat.length = iattr->ia_size;
1145 if (v9fs_proto_dotu(v9ses)) {
1146 if (iattr->ia_valid & ATTR_UID)
1147 wstat.n_uid = iattr->ia_uid;
1149 if (iattr->ia_valid & ATTR_GID)
1150 wstat.n_gid = iattr->ia_gid;
1153 /* Write all dirty data */
1154 if (S_ISREG(dentry->d_inode->i_mode))
1155 filemap_write_and_wait(dentry->d_inode->i_mapping);
1157 retval = p9_client_wstat(fid, &wstat);
1161 if ((iattr->ia_valid & ATTR_SIZE) &&
1162 iattr->ia_size != i_size_read(dentry->d_inode))
1163 truncate_setsize(dentry->d_inode, iattr->ia_size);
1165 v9fs_invalidate_inode_attr(dentry->d_inode);
1167 setattr_copy(dentry->d_inode, iattr);
1168 mark_inode_dirty(dentry->d_inode);
1173 * v9fs_stat2inode - populate an inode structure with mistat info
1174 * @stat: Plan 9 metadata (mistat) structure
1175 * @inode: inode to populate
1176 * @sb: superblock of filesystem
1181 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1182 struct super_block *sb)
1187 unsigned int i_nlink;
1188 struct v9fs_session_info *v9ses = sb->s_fs_info;
1189 struct v9fs_inode *v9inode = V9FS_I(inode);
1191 set_nlink(inode, 1);
1193 inode->i_atime.tv_sec = stat->atime;
1194 inode->i_mtime.tv_sec = stat->mtime;
1195 inode->i_ctime.tv_sec = stat->mtime;
1197 inode->i_uid = v9ses->dfltuid;
1198 inode->i_gid = v9ses->dfltgid;
1200 if (v9fs_proto_dotu(v9ses)) {
1201 inode->i_uid = stat->n_uid;
1202 inode->i_gid = stat->n_gid;
1204 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1205 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1207 * Hadlink support got added later to
1208 * to the .u extension. So there can be
1209 * server out there that doesn't support
1210 * this even with .u extension. So check
1211 * for non NULL stat->extension
1213 strncpy(ext, stat->extension, sizeof(ext));
1214 /* HARDLINKCOUNT %u */
1215 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1216 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1217 set_nlink(inode, i_nlink);
1220 mode = p9mode2perm(v9ses, stat);
1221 mode |= inode->i_mode & ~S_IALLUGO;
1222 inode->i_mode = mode;
1223 i_size_write(inode, stat->length);
1225 /* not real number of blocks, but 512 byte ones ... */
1226 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1227 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1231 * v9fs_qid2ino - convert qid into inode number
1234 * BUG: potential for inode number collisions?
1237 ino_t v9fs_qid2ino(struct p9_qid *qid)
1239 u64 path = qid->path + 2;
1242 if (sizeof(ino_t) == sizeof(path))
1243 memcpy(&i, &path, sizeof(ino_t));
1245 i = (ino_t) (path ^ (path >> 32));
1251 * v9fs_readlink - read a symlink's location (internal version)
1252 * @dentry: dentry for symlink
1253 * @buffer: buffer to load symlink location into
1254 * @buflen: length of buffer
1258 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1262 struct v9fs_session_info *v9ses;
1264 struct p9_wstat *st;
1266 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1268 v9ses = v9fs_dentry2v9ses(dentry);
1269 fid = v9fs_fid_lookup(dentry);
1271 return PTR_ERR(fid);
1273 if (!v9fs_proto_dotu(v9ses))
1276 st = p9_client_stat(fid);
1280 if (!(st->mode & P9_DMSYMLINK)) {
1285 /* copy extension buffer into buffer */
1286 strncpy(buffer, st->extension, buflen);
1288 p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n",
1289 dentry->d_name.name, st->extension, buffer);
1291 retval = strnlen(buffer, buflen);
1299 * v9fs_vfs_follow_link - follow a symlink path
1300 * @dentry: dentry for symlink
1305 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1308 char *link = __getname();
1310 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
1313 link = ERR_PTR(-ENOMEM);
1315 len = v9fs_readlink(dentry, link, PATH_MAX);
1319 link = ERR_PTR(len);
1321 link[min(len, PATH_MAX-1)] = 0;
1323 nd_set_link(nd, link);
1329 * v9fs_vfs_put_link - release a symlink path
1330 * @dentry: dentry for symlink
1337 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1339 char *s = nd_get_link(nd);
1341 p9_debug(P9_DEBUG_VFS, " %s %s\n",
1342 dentry->d_name.name, IS_ERR(s) ? "<error>" : s);
1348 * v9fs_vfs_mkspecial - create a special file
1349 * @dir: inode to create special file in
1350 * @dentry: dentry to create
1351 * @mode: mode to create special file
1352 * @extension: 9p2000.u format extension string representing special file
1356 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1357 u32 perm, const char *extension)
1360 struct v9fs_session_info *v9ses;
1362 v9ses = v9fs_inode2v9ses(dir);
1363 if (!v9fs_proto_dotu(v9ses)) {
1364 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1368 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1371 return PTR_ERR(fid);
1373 v9fs_invalidate_inode_attr(dir);
1374 p9_client_clunk(fid);
1379 * v9fs_vfs_symlink - helper function to create symlinks
1380 * @dir: directory inode containing symlink
1381 * @dentry: dentry for symlink
1382 * @symname: symlink data
1384 * See Also: 9P2000.u RFC for more information
1389 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1391 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1392 dir->i_ino, dentry->d_name.name, symname);
1394 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1398 * v9fs_vfs_link - create a hardlink
1399 * @old_dentry: dentry for file to link to
1400 * @dir: inode destination for new link
1401 * @dentry: dentry for link
1406 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1407 struct dentry *dentry)
1411 struct p9_fid *oldfid;
1413 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1414 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name);
1416 oldfid = v9fs_fid_clone(old_dentry);
1418 return PTR_ERR(oldfid);
1421 if (unlikely(!name)) {
1426 sprintf(name, "%d\n", oldfid->fid);
1427 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1430 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1431 v9fs_invalidate_inode_attr(dir);
1434 p9_client_clunk(oldfid);
1439 * v9fs_vfs_mknod - create a special file
1440 * @dir: inode destination for new link
1441 * @dentry: dentry for file
1442 * @mode: mode for creation
1443 * @rdev: device associated with special file
1448 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1450 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1455 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
1456 dir->i_ino, dentry->d_name.name, mode,
1457 MAJOR(rdev), MINOR(rdev));
1459 if (!new_valid_dev(rdev))
1465 /* build extension */
1467 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1468 else if (S_ISCHR(mode))
1469 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1470 else if (S_ISFIFO(mode))
1472 else if (S_ISSOCK(mode))
1479 perm = unixmode2p9mode(v9ses, mode);
1480 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1486 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1491 struct p9_wstat *st;
1492 struct v9fs_session_info *v9ses;
1494 v9ses = v9fs_inode2v9ses(inode);
1495 st = p9_client_stat(fid);
1499 * Don't update inode if the file type is different
1501 umode = p9mode2unixmode(v9ses, st, &rdev);
1502 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1505 spin_lock(&inode->i_lock);
1507 * We don't want to refresh inode->i_size,
1508 * because we may have cached data
1510 i_size = inode->i_size;
1511 v9fs_stat2inode(st, inode, inode->i_sb);
1513 inode->i_size = i_size;
1514 spin_unlock(&inode->i_lock);
1521 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1522 .create = v9fs_vfs_create,
1523 .lookup = v9fs_vfs_lookup,
1524 .atomic_open = v9fs_vfs_atomic_open,
1525 .symlink = v9fs_vfs_symlink,
1526 .link = v9fs_vfs_link,
1527 .unlink = v9fs_vfs_unlink,
1528 .mkdir = v9fs_vfs_mkdir,
1529 .rmdir = v9fs_vfs_rmdir,
1530 .mknod = v9fs_vfs_mknod,
1531 .rename = v9fs_vfs_rename,
1532 .getattr = v9fs_vfs_getattr,
1533 .setattr = v9fs_vfs_setattr,
1536 static const struct inode_operations v9fs_dir_inode_operations = {
1537 .create = v9fs_vfs_create,
1538 .lookup = v9fs_vfs_lookup,
1539 .atomic_open = v9fs_vfs_atomic_open,
1540 .unlink = v9fs_vfs_unlink,
1541 .mkdir = v9fs_vfs_mkdir,
1542 .rmdir = v9fs_vfs_rmdir,
1543 .mknod = v9fs_vfs_mknod,
1544 .rename = v9fs_vfs_rename,
1545 .getattr = v9fs_vfs_getattr,
1546 .setattr = v9fs_vfs_setattr,
1549 static const struct inode_operations v9fs_file_inode_operations = {
1550 .getattr = v9fs_vfs_getattr,
1551 .setattr = v9fs_vfs_setattr,
1554 static const struct inode_operations v9fs_symlink_inode_operations = {
1555 .readlink = generic_readlink,
1556 .follow_link = v9fs_vfs_follow_link,
1557 .put_link = v9fs_vfs_put_link,
1558 .getattr = v9fs_vfs_getattr,
1559 .setattr = v9fs_vfs_setattr,