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 %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)
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;
304 &v9fs_cached_file_operations_dotl;
306 inode->i_fop = &v9fs_file_operations_dotl;
308 inode->i_op = &v9fs_file_inode_operations;
310 inode->i_fop = &v9fs_cached_file_operations;
312 inode->i_fop = &v9fs_file_operations;
317 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
318 p9_debug(P9_DEBUG_ERROR,
319 "extended modes used with legacy protocol\n");
324 if (v9fs_proto_dotl(v9ses))
325 inode->i_op = &v9fs_symlink_inode_operations_dotl;
327 inode->i_op = &v9fs_symlink_inode_operations;
332 if (v9fs_proto_dotl(v9ses))
333 inode->i_op = &v9fs_dir_inode_operations_dotl;
334 else if (v9fs_proto_dotu(v9ses))
335 inode->i_op = &v9fs_dir_inode_operations_dotu;
337 inode->i_op = &v9fs_dir_inode_operations;
339 if (v9fs_proto_dotl(v9ses))
340 inode->i_fop = &v9fs_dir_operations_dotl;
342 inode->i_fop = &v9fs_dir_operations;
346 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
347 mode, mode & S_IFMT);
357 * v9fs_get_inode - helper function to setup an inode
359 * @mode: mode to setup inode with
363 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
367 struct v9fs_session_info *v9ses = sb->s_fs_info;
369 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
371 inode = new_inode(sb);
373 pr_warn("%s (%d): Problem allocating inode\n",
374 __func__, task_pid_nr(current));
375 return ERR_PTR(-ENOMEM);
377 err = v9fs_init_inode(v9ses, inode, mode, rdev);
386 static struct v9fs_fid*
387 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
391 struct v9fs_fid *ret;
392 struct v9fs_fcall *fcall;
394 nfid = v9fs_get_idpool(&v9ses->fidpool);
396 eprintk(KERN_WARNING, "no free fids available\n");
397 return ERR_PTR(-ENOSPC);
400 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
404 if (fcall && fcall->id == RWALK)
407 PRINT_FCALL_ERROR("walk error", fcall);
408 v9fs_put_idpool(nfid, &v9ses->fidpool);
414 ret = v9fs_fid_create(v9ses, nfid);
420 err = v9fs_fid_insert(ret, dentry);
422 v9fs_fid_destroy(ret);
429 v9fs_t_clunk(v9ses, nfid);
439 * v9fs_clear_inode - release an inode
440 * @inode: inode to release
443 void v9fs_evict_inode(struct inode *inode)
445 struct v9fs_inode *v9inode = V9FS_I(inode);
447 truncate_inode_pages(inode->i_mapping, 0);
449 filemap_fdatawrite(inode->i_mapping);
451 v9fs_cache_inode_put_cookie(inode);
452 /* clunk the fid stashed in writeback_fid */
453 if (v9inode->writeback_fid) {
454 p9_client_clunk(v9inode->writeback_fid);
455 v9inode->writeback_fid = NULL;
459 static int v9fs_test_inode(struct inode *inode, void *data)
463 struct v9fs_inode *v9inode = V9FS_I(inode);
464 struct p9_wstat *st = (struct p9_wstat *)data;
465 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
467 umode = p9mode2unixmode(v9ses, st, &rdev);
468 /* don't match inode of different type */
469 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
472 /* compare qid details */
473 if (memcmp(&v9inode->qid.version,
474 &st->qid.version, sizeof(v9inode->qid.version)))
477 if (v9inode->qid.type != st->qid.type)
482 static int v9fs_test_new_inode(struct inode *inode, void *data)
487 static int v9fs_set_inode(struct inode *inode, void *data)
489 struct v9fs_inode *v9inode = V9FS_I(inode);
490 struct p9_wstat *st = (struct p9_wstat *)data;
492 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
496 static struct inode *v9fs_qid_iget(struct super_block *sb,
506 struct v9fs_session_info *v9ses = sb->s_fs_info;
507 int (*test)(struct inode *, void *);
510 test = v9fs_test_new_inode;
512 test = v9fs_test_inode;
514 i_ino = v9fs_qid2ino(qid);
515 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
517 return ERR_PTR(-ENOMEM);
518 if (!(inode->i_state & I_NEW))
521 * initialize the inode with the stat info
522 * FIXME!! we may need support for stale inodes
525 inode->i_ino = i_ino;
526 umode = p9mode2unixmode(v9ses, st, &rdev);
527 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
531 v9fs_stat2inode(st, inode, sb);
532 v9fs_cache_inode_get_cookie(inode);
533 unlock_new_inode(inode);
536 unlock_new_inode(inode);
538 return ERR_PTR(retval);
543 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
544 struct super_block *sb, int new)
547 struct inode *inode = NULL;
549 st = p9_client_stat(fid);
553 inode = v9fs_qid_iget(sb, &st->qid, st, new);
560 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
562 * @flags: flags to convert
564 static int v9fs_at_to_dotl_flags(int flags)
567 if (flags & AT_REMOVEDIR)
568 rflags |= P9_DOTL_AT_REMOVEDIR;
573 * v9fs_remove - helper function to remove files and directories
574 * @dir: directory inode that is being deleted
575 * @dentry: dentry that is being deleted
576 * @rmdir: removing a directory
580 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
583 int retval = -EOPNOTSUPP;
584 struct p9_fid *v9fid, *dfid;
585 struct v9fs_session_info *v9ses;
587 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
590 v9ses = v9fs_inode2v9ses(dir);
591 inode = dentry->d_inode;
592 dfid = v9fs_fid_lookup(dentry->d_parent);
594 retval = PTR_ERR(dfid);
595 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
598 if (v9fs_proto_dotl(v9ses))
599 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
600 v9fs_at_to_dotl_flags(flags));
601 if (retval == -EOPNOTSUPP) {
602 /* Try the one based on path */
603 v9fid = v9fs_fid_clone(dentry);
605 return PTR_ERR(v9fid);
606 retval = p9_client_remove(v9fid);
610 * directories on unlink should have zero
613 if (flags & AT_REMOVEDIR) {
619 v9fs_invalidate_inode_attr(inode);
620 v9fs_invalidate_inode_attr(dir);
626 * v9fs_create - Create a file
627 * @v9ses: session information
628 * @dir: directory that dentry is being created in
629 * @dentry: dentry that is being created
630 * @extension: 9p2000.u extension string to support devices, etc.
631 * @perm: create permissions
635 static struct p9_fid *
636 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
637 struct dentry *dentry, char *extension, u32 perm, u8 mode)
641 struct p9_fid *dfid, *ofid, *fid;
644 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
649 name = (char *) dentry->d_name.name;
650 dfid = v9fs_fid_lookup(dentry->d_parent);
653 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
657 /* clone a fid to use for creation */
658 ofid = p9_client_walk(dfid, 0, NULL, 1);
661 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
665 err = p9_client_fcreate(ofid, name, perm, mode, extension);
667 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
671 if (!(perm & P9_DMLINK)) {
672 /* now walk from the parent so we can get unopened fid */
673 fid = p9_client_walk(dfid, 1, &name, 1);
676 p9_debug(P9_DEBUG_VFS,
677 "p9_client_walk failed %d\n", err);
682 * instantiate inode and assign the unopened fid to the dentry
684 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
686 err = PTR_ERR(inode);
687 p9_debug(P9_DEBUG_VFS,
688 "inode creation failed %d\n", err);
691 v9fs_fid_add(dentry, fid);
692 d_instantiate(dentry, inode);
697 p9_client_clunk(ofid);
700 p9_client_clunk(fid);
706 * v9fs_vfs_create - VFS hook to create a regular file
708 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
711 * @dir: directory inode that is being created
712 * @dentry: dentry that is being deleted
713 * @mode: create permissions
718 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
721 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
722 u32 perm = unixmode2p9mode(v9ses, mode);
726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
730 v9fs_invalidate_inode_attr(dir);
731 p9_client_clunk(fid);
737 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
738 * @dir: inode that is being unlinked
739 * @dentry: dentry that is being unlinked
740 * @mode: mode for new directory
744 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
749 struct v9fs_session_info *v9ses;
751 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
753 v9ses = v9fs_inode2v9ses(dir);
754 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
755 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
761 v9fs_invalidate_inode_attr(dir);
765 p9_client_clunk(fid);
771 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
772 * @dir: inode that is being walked from
773 * @dentry: dentry that is being walked to?
774 * @nameidata: path data
778 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
782 struct v9fs_session_info *v9ses;
783 struct p9_fid *dfid, *fid;
787 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n",
788 dir, dentry->d_name.name, dentry, flags);
790 if (dentry->d_name.len > NAME_MAX)
791 return ERR_PTR(-ENAMETOOLONG);
793 v9ses = v9fs_inode2v9ses(dir);
794 /* We can walk d_parent because we hold the dir->i_mutex */
795 dfid = v9fs_fid_lookup(dentry->d_parent);
797 return ERR_CAST(dfid);
799 name = (char *) dentry->d_name.name;
800 fid = p9_client_walk(dfid, 1, &name, 1);
802 if (fid == ERR_PTR(-ENOENT)) {
806 return ERR_CAST(fid);
809 * Make sure we don't use a wrong inode due to parallel
810 * unlink. For cached mode create calls request for new
811 * inode. But with cache disabled, lookup should do this.
814 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
816 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
818 p9_client_clunk(fid);
819 return ERR_CAST(inode);
822 * If we had a rename on the server and a parallel lookup
823 * for the new name, then make sure we instantiate with
824 * the new name. ie look up for a/b, while on server somebody
825 * moved b under k and client parallely did a lookup for
828 res = d_materialise_unique(dentry, inode);
830 v9fs_fid_add(dentry, fid);
831 else if (!IS_ERR(res))
832 v9fs_fid_add(res, fid);
834 p9_client_clunk(fid);
839 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
840 struct file *file, unsigned flags, umode_t mode,
845 struct v9fs_inode *v9inode;
846 struct v9fs_session_info *v9ses;
847 struct p9_fid *fid, *inode_fid;
848 struct dentry *res = NULL;
850 if (d_unhashed(dentry)) {
851 res = v9fs_vfs_lookup(dir, dentry, 0);
860 if (!(flags & O_CREAT) || dentry->d_inode)
861 return finish_no_open(file, res);
865 v9ses = v9fs_inode2v9ses(dir);
866 perm = unixmode2p9mode(v9ses, mode);
867 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
868 v9fs_uflags2omode(flags,
869 v9fs_proto_dotu(v9ses)));
876 v9fs_invalidate_inode_attr(dir);
877 v9inode = V9FS_I(dentry->d_inode);
878 mutex_lock(&v9inode->v_mutex);
879 if (v9ses->cache && !v9inode->writeback_fid &&
880 ((flags & O_ACCMODE) != O_RDONLY)) {
882 * clone a fid and add it to writeback_fid
883 * we do it during open time instead of
884 * page dirty time via write_begin/page_mkwrite
885 * because we want write after unlink usecase
888 inode_fid = v9fs_writeback_fid(dentry);
889 if (IS_ERR(inode_fid)) {
890 err = PTR_ERR(inode_fid);
891 mutex_unlock(&v9inode->v_mutex);
894 v9inode->writeback_fid = (void *) inode_fid;
896 mutex_unlock(&v9inode->v_mutex);
897 err = finish_open(file, dentry, generic_file_open, opened);
901 file->private_data = fid;
903 v9fs_cache_inode_set_cookie(dentry->d_inode, file);
905 *opened |= FILE_CREATED;
912 p9_client_clunk(fid);
917 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
918 * @i: inode that is being unlinked
919 * @d: dentry that is being unlinked
923 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
925 return v9fs_remove(i, d, 0);
929 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
930 * @i: inode that is being unlinked
931 * @d: dentry that is being unlinked
935 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
937 return v9fs_remove(i, d, AT_REMOVEDIR);
941 * v9fs_vfs_rename - VFS hook to rename an inode
942 * @old_dir: old dir inode
943 * @old_dentry: old dentry
944 * @new_dir: new dir inode
945 * @new_dentry: new dentry
950 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
951 struct inode *new_dir, struct dentry *new_dentry)
954 struct inode *old_inode;
955 struct inode *new_inode;
956 struct v9fs_session_info *v9ses;
957 struct p9_fid *oldfid;
958 struct p9_fid *olddirfid;
959 struct p9_fid *newdirfid;
960 struct p9_wstat wstat;
962 p9_debug(P9_DEBUG_VFS, "\n");
964 old_inode = old_dentry->d_inode;
965 new_inode = new_dentry->d_inode;
966 v9ses = v9fs_inode2v9ses(old_inode);
967 oldfid = v9fs_fid_lookup(old_dentry);
969 return PTR_ERR(oldfid);
971 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
972 if (IS_ERR(olddirfid)) {
973 retval = PTR_ERR(olddirfid);
977 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
978 if (IS_ERR(newdirfid)) {
979 retval = PTR_ERR(newdirfid);
983 down_write(&v9ses->rename_sem);
984 if (v9fs_proto_dotl(v9ses)) {
985 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
986 newdirfid, new_dentry->d_name.name);
987 if (retval == -EOPNOTSUPP)
988 retval = p9_client_rename(oldfid, newdirfid,
989 new_dentry->d_name.name);
990 if (retval != -EOPNOTSUPP)
993 if (old_dentry->d_parent != new_dentry->d_parent) {
995 * 9P .u can only handle file rename in the same directory
998 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1002 v9fs_blank_wstat(&wstat);
1003 wstat.muid = v9ses->uname;
1004 wstat.name = (char *) new_dentry->d_name.name;
1005 retval = p9_client_wstat(oldfid, &wstat);
1010 if (S_ISDIR(new_inode->i_mode))
1011 clear_nlink(new_inode);
1013 drop_nlink(new_inode);
1015 if (S_ISDIR(old_inode->i_mode)) {
1018 drop_nlink(old_dir);
1020 v9fs_invalidate_inode_attr(old_inode);
1021 v9fs_invalidate_inode_attr(old_dir);
1022 v9fs_invalidate_inode_attr(new_dir);
1024 /* successful rename */
1025 d_move(old_dentry, new_dentry);
1027 up_write(&v9ses->rename_sem);
1028 p9_client_clunk(newdirfid);
1031 p9_client_clunk(olddirfid);
1038 * v9fs_vfs_getattr - retrieve file metadata
1039 * @mnt: mount information
1040 * @dentry: file to get attributes on
1041 * @stat: metadata structure to populate
1046 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1049 struct v9fs_session_info *v9ses;
1051 struct p9_wstat *st;
1053 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1054 v9ses = v9fs_dentry2v9ses(dentry);
1055 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1056 generic_fillattr(dentry->d_inode, stat);
1059 fid = v9fs_fid_lookup(dentry);
1061 return PTR_ERR(fid);
1063 st = p9_client_stat(fid);
1067 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1068 generic_fillattr(dentry->d_inode, stat);
1076 * v9fs_vfs_setattr - set file metadata
1077 * @dentry: file whose metadata to set
1078 * @iattr: metadata assignment structure
1082 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1085 struct v9fs_session_info *v9ses;
1087 struct p9_wstat wstat;
1089 p9_debug(P9_DEBUG_VFS, "\n");
1090 retval = inode_change_ok(dentry->d_inode, iattr);
1095 v9ses = v9fs_dentry2v9ses(dentry);
1096 fid = v9fs_fid_lookup(dentry);
1098 return PTR_ERR(fid);
1100 v9fs_blank_wstat(&wstat);
1101 if (iattr->ia_valid & ATTR_MODE)
1102 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1104 if (iattr->ia_valid & ATTR_MTIME)
1105 wstat.mtime = iattr->ia_mtime.tv_sec;
1107 if (iattr->ia_valid & ATTR_ATIME)
1108 wstat.atime = iattr->ia_atime.tv_sec;
1110 if (iattr->ia_valid & ATTR_SIZE)
1111 wstat.length = iattr->ia_size;
1113 if (v9fs_proto_dotu(v9ses)) {
1114 if (iattr->ia_valid & ATTR_UID)
1115 wstat.n_uid = iattr->ia_uid;
1117 if (iattr->ia_valid & ATTR_GID)
1118 wstat.n_gid = iattr->ia_gid;
1121 /* Write all dirty data */
1122 if (S_ISREG(dentry->d_inode->i_mode))
1123 filemap_write_and_wait(dentry->d_inode->i_mapping);
1125 retval = p9_client_wstat(fid, &wstat);
1129 if ((iattr->ia_valid & ATTR_SIZE) &&
1130 iattr->ia_size != i_size_read(dentry->d_inode))
1131 truncate_setsize(dentry->d_inode, iattr->ia_size);
1133 v9fs_invalidate_inode_attr(dentry->d_inode);
1135 setattr_copy(dentry->d_inode, iattr);
1136 mark_inode_dirty(dentry->d_inode);
1141 * v9fs_stat2inode - populate an inode structure with mistat info
1142 * @stat: Plan 9 metadata (mistat) structure
1143 * @inode: inode to populate
1144 * @sb: superblock of filesystem
1149 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1150 struct super_block *sb)
1155 unsigned int i_nlink;
1156 struct v9fs_session_info *v9ses = sb->s_fs_info;
1157 struct v9fs_inode *v9inode = V9FS_I(inode);
1159 set_nlink(inode, 1);
1161 inode->i_atime.tv_sec = stat->atime;
1162 inode->i_mtime.tv_sec = stat->mtime;
1163 inode->i_ctime.tv_sec = stat->mtime;
1165 inode->i_uid = v9ses->dfltuid;
1166 inode->i_gid = v9ses->dfltgid;
1168 if (v9fs_proto_dotu(v9ses)) {
1169 inode->i_uid = stat->n_uid;
1170 inode->i_gid = stat->n_gid;
1172 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1173 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1175 * Hadlink support got added later to
1176 * to the .u extension. So there can be
1177 * server out there that doesn't support
1178 * this even with .u extension. So check
1179 * for non NULL stat->extension
1181 strlcpy(ext, stat->extension, sizeof(ext));
1182 /* HARDLINKCOUNT %u */
1183 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1184 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1185 set_nlink(inode, i_nlink);
1188 mode = p9mode2perm(v9ses, stat);
1189 mode |= inode->i_mode & ~S_IALLUGO;
1190 inode->i_mode = mode;
1191 i_size_write(inode, stat->length);
1193 /* not real number of blocks, but 512 byte ones ... */
1194 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1195 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1199 * v9fs_qid2ino - convert qid into inode number
1202 * BUG: potential for inode number collisions?
1205 ino_t v9fs_qid2ino(struct p9_qid *qid)
1207 u64 path = qid->path + 2;
1210 if (sizeof(ino_t) == sizeof(path))
1211 memcpy(&i, &path, sizeof(ino_t));
1213 i = (ino_t) (path ^ (path >> 32));
1219 * v9fs_readlink - read a symlink's location (internal version)
1220 * @dentry: dentry for symlink
1221 * @buffer: buffer to load symlink location into
1222 * @buflen: length of buffer
1226 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1230 struct v9fs_session_info *v9ses;
1232 struct p9_wstat *st;
1234 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1236 v9ses = v9fs_dentry2v9ses(dentry);
1237 fid = v9fs_fid_lookup(dentry);
1239 return PTR_ERR(fid);
1241 if (!v9fs_proto_dotu(v9ses))
1244 st = p9_client_stat(fid);
1248 if (!(st->mode & P9_DMSYMLINK)) {
1253 /* copy extension buffer into buffer */
1254 retval = min(strlen(st->extension)+1, (size_t)buflen);
1255 memcpy(buffer, st->extension, retval);
1257 p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n",
1258 dentry->d_name.name, st->extension, buflen, buffer);
1267 * v9fs_vfs_follow_link - follow a symlink path
1268 * @dentry: dentry for symlink
1273 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1276 char *link = __getname();
1278 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
1281 link = ERR_PTR(-ENOMEM);
1283 len = v9fs_readlink(dentry, link, PATH_MAX);
1287 link = ERR_PTR(len);
1289 link[min(len, PATH_MAX-1)] = 0;
1291 nd_set_link(nd, link);
1297 * v9fs_vfs_put_link - release a symlink path
1298 * @dentry: dentry for symlink
1305 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1307 char *s = nd_get_link(nd);
1309 p9_debug(P9_DEBUG_VFS, " %s %s\n",
1310 dentry->d_name.name, IS_ERR(s) ? "<error>" : s);
1316 * v9fs_vfs_mkspecial - create a special file
1317 * @dir: inode to create special file in
1318 * @dentry: dentry to create
1319 * @mode: mode to create special file
1320 * @extension: 9p2000.u format extension string representing special file
1324 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1325 u32 perm, const char *extension)
1328 struct v9fs_session_info *v9ses;
1330 v9ses = v9fs_inode2v9ses(dir);
1331 if (!v9fs_proto_dotu(v9ses)) {
1332 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1336 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1339 return PTR_ERR(fid);
1341 v9fs_invalidate_inode_attr(dir);
1342 p9_client_clunk(fid);
1347 * v9fs_vfs_symlink - helper function to create symlinks
1348 * @dir: directory inode containing symlink
1349 * @dentry: dentry for symlink
1350 * @symname: symlink data
1352 * See Also: 9P2000.u RFC for more information
1357 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1359 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1360 dir->i_ino, dentry->d_name.name, symname);
1362 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1366 * v9fs_vfs_link - create a hardlink
1367 * @old_dentry: dentry for file to link to
1368 * @dir: inode destination for new link
1369 * @dentry: dentry for link
1374 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1375 struct dentry *dentry)
1379 struct p9_fid *oldfid;
1381 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1382 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name);
1384 oldfid = v9fs_fid_clone(old_dentry);
1386 return PTR_ERR(oldfid);
1389 if (unlikely(!name)) {
1394 sprintf(name, "%d\n", oldfid->fid);
1395 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1398 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1399 v9fs_invalidate_inode_attr(dir);
1402 p9_client_clunk(oldfid);
1407 * v9fs_vfs_mknod - create a special file
1408 * @dir: inode destination for new link
1409 * @dentry: dentry for file
1410 * @mode: mode for creation
1411 * @rdev: device associated with special file
1416 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1418 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1423 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
1424 dir->i_ino, dentry->d_name.name, mode,
1425 MAJOR(rdev), MINOR(rdev));
1427 if (!new_valid_dev(rdev))
1433 /* build extension */
1435 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1436 else if (S_ISCHR(mode))
1437 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1438 else if (S_ISFIFO(mode))
1440 else if (S_ISSOCK(mode))
1447 perm = unixmode2p9mode(v9ses, mode);
1448 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1454 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1459 struct p9_wstat *st;
1460 struct v9fs_session_info *v9ses;
1462 v9ses = v9fs_inode2v9ses(inode);
1463 st = p9_client_stat(fid);
1467 * Don't update inode if the file type is different
1469 umode = p9mode2unixmode(v9ses, st, &rdev);
1470 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1473 spin_lock(&inode->i_lock);
1475 * We don't want to refresh inode->i_size,
1476 * because we may have cached data
1478 i_size = inode->i_size;
1479 v9fs_stat2inode(st, inode, inode->i_sb);
1481 inode->i_size = i_size;
1482 spin_unlock(&inode->i_lock);
1489 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1490 .create = v9fs_vfs_create,
1491 .lookup = v9fs_vfs_lookup,
1492 .atomic_open = v9fs_vfs_atomic_open,
1493 .symlink = v9fs_vfs_symlink,
1494 .link = v9fs_vfs_link,
1495 .unlink = v9fs_vfs_unlink,
1496 .mkdir = v9fs_vfs_mkdir,
1497 .rmdir = v9fs_vfs_rmdir,
1498 .mknod = v9fs_vfs_mknod,
1499 .rename = v9fs_vfs_rename,
1500 .getattr = v9fs_vfs_getattr,
1501 .setattr = v9fs_vfs_setattr,
1504 static const struct inode_operations v9fs_dir_inode_operations = {
1505 .create = v9fs_vfs_create,
1506 .lookup = v9fs_vfs_lookup,
1507 .atomic_open = v9fs_vfs_atomic_open,
1508 .unlink = v9fs_vfs_unlink,
1509 .mkdir = v9fs_vfs_mkdir,
1510 .rmdir = v9fs_vfs_rmdir,
1511 .mknod = v9fs_vfs_mknod,
1512 .rename = v9fs_vfs_rename,
1513 .getattr = v9fs_vfs_getattr,
1514 .setattr = v9fs_vfs_setattr,
1517 static const struct inode_operations v9fs_file_inode_operations = {
1518 .getattr = v9fs_vfs_getattr,
1519 .setattr = v9fs_vfs_setattr,
1522 static const struct inode_operations v9fs_symlink_inode_operations = {
1523 .readlink = generic_readlink,
1524 .follow_link = v9fs_vfs_follow_link,
1525 .put_link = v9fs_vfs_put_link,
1526 .getattr = v9fs_vfs_getattr,
1527 .setattr = v9fs_vfs_setattr,