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 mutex_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_free_inode - destroy an inode
260 void v9fs_free_inode(struct inode *inode)
262 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
265 int v9fs_init_inode(struct v9fs_session_info *v9ses,
266 struct inode *inode, umode_t mode, dev_t rdev)
270 inode_init_owner(inode, NULL, mode);
272 inode->i_rdev = rdev;
273 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
274 inode->i_mapping->a_ops = &v9fs_addr_operations;
276 switch (mode & S_IFMT) {
281 if (v9fs_proto_dotl(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations_dotl;
283 } else if (v9fs_proto_dotu(v9ses)) {
284 inode->i_op = &v9fs_file_inode_operations;
286 p9_debug(P9_DEBUG_ERROR,
287 "special files without extended mode\n");
291 init_special_inode(inode, inode->i_mode, inode->i_rdev);
294 if (v9fs_proto_dotl(v9ses)) {
295 inode->i_op = &v9fs_file_inode_operations_dotl;
296 if (v9ses->cache == CACHE_LOOSE ||
297 v9ses->cache == CACHE_FSCACHE)
299 &v9fs_cached_file_operations_dotl;
300 else if (v9ses->cache == CACHE_MMAP)
301 inode->i_fop = &v9fs_mmap_file_operations_dotl;
303 inode->i_fop = &v9fs_file_operations_dotl;
305 inode->i_op = &v9fs_file_inode_operations;
306 if (v9ses->cache == CACHE_LOOSE ||
307 v9ses->cache == CACHE_FSCACHE)
309 &v9fs_cached_file_operations;
310 else if (v9ses->cache == CACHE_MMAP)
311 inode->i_fop = &v9fs_mmap_file_operations;
313 inode->i_fop = &v9fs_file_operations;
318 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
319 p9_debug(P9_DEBUG_ERROR,
320 "extended modes used with legacy protocol\n");
325 if (v9fs_proto_dotl(v9ses))
326 inode->i_op = &v9fs_symlink_inode_operations_dotl;
328 inode->i_op = &v9fs_symlink_inode_operations;
333 if (v9fs_proto_dotl(v9ses))
334 inode->i_op = &v9fs_dir_inode_operations_dotl;
335 else if (v9fs_proto_dotu(v9ses))
336 inode->i_op = &v9fs_dir_inode_operations_dotu;
338 inode->i_op = &v9fs_dir_inode_operations;
340 if (v9fs_proto_dotl(v9ses))
341 inode->i_fop = &v9fs_dir_operations_dotl;
343 inode->i_fop = &v9fs_dir_operations;
347 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
348 mode, mode & S_IFMT);
358 * v9fs_get_inode - helper function to setup an inode
360 * @mode: mode to setup inode with
364 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
368 struct v9fs_session_info *v9ses = sb->s_fs_info;
370 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
372 inode = new_inode(sb);
374 pr_warn("%s (%d): Problem allocating inode\n",
375 __func__, task_pid_nr(current));
376 return ERR_PTR(-ENOMEM);
378 err = v9fs_init_inode(v9ses, inode, mode, rdev);
387 static struct v9fs_fid*
388 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
392 struct v9fs_fid *ret;
393 struct v9fs_fcall *fcall;
395 nfid = v9fs_get_idpool(&v9ses->fidpool);
397 eprintk(KERN_WARNING, "no free fids available\n");
398 return ERR_PTR(-ENOSPC);
401 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
405 if (fcall && fcall->id == RWALK)
408 PRINT_FCALL_ERROR("walk error", fcall);
409 v9fs_put_idpool(nfid, &v9ses->fidpool);
415 ret = v9fs_fid_create(v9ses, nfid);
421 err = v9fs_fid_insert(ret, dentry);
423 v9fs_fid_destroy(ret);
430 v9fs_t_clunk(v9ses, nfid);
440 * v9fs_clear_inode - release an inode
441 * @inode: inode to release
444 void v9fs_evict_inode(struct inode *inode)
446 struct v9fs_inode *v9inode = V9FS_I(inode);
448 truncate_inode_pages_final(&inode->i_data);
450 filemap_fdatawrite(&inode->i_data);
452 v9fs_cache_inode_put_cookie(inode);
453 /* clunk the fid stashed in writeback_fid */
454 if (v9inode->writeback_fid) {
455 p9_client_clunk(v9inode->writeback_fid);
456 v9inode->writeback_fid = NULL;
460 static int v9fs_test_inode(struct inode *inode, void *data)
464 struct v9fs_inode *v9inode = V9FS_I(inode);
465 struct p9_wstat *st = (struct p9_wstat *)data;
466 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
468 umode = p9mode2unixmode(v9ses, st, &rdev);
469 /* don't match inode of different type */
470 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
473 /* compare qid details */
474 if (memcmp(&v9inode->qid.version,
475 &st->qid.version, sizeof(v9inode->qid.version)))
478 if (v9inode->qid.type != st->qid.type)
481 if (v9inode->qid.path != st->qid.path)
486 static int v9fs_test_new_inode(struct inode *inode, void *data)
491 static int v9fs_set_inode(struct inode *inode, void *data)
493 struct v9fs_inode *v9inode = V9FS_I(inode);
494 struct p9_wstat *st = (struct p9_wstat *)data;
496 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
500 static struct inode *v9fs_qid_iget(struct super_block *sb,
510 struct v9fs_session_info *v9ses = sb->s_fs_info;
511 int (*test)(struct inode *, void *);
514 test = v9fs_test_new_inode;
516 test = v9fs_test_inode;
518 i_ino = v9fs_qid2ino(qid);
519 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
521 return ERR_PTR(-ENOMEM);
522 if (!(inode->i_state & I_NEW))
525 * initialize the inode with the stat info
526 * FIXME!! we may need support for stale inodes
529 inode->i_ino = i_ino;
530 umode = p9mode2unixmode(v9ses, st, &rdev);
531 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
535 v9fs_stat2inode(st, inode, sb, 0);
536 v9fs_cache_inode_get_cookie(inode);
537 unlock_new_inode(inode);
541 return ERR_PTR(retval);
546 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
547 struct super_block *sb, int new)
550 struct inode *inode = NULL;
552 st = p9_client_stat(fid);
556 inode = v9fs_qid_iget(sb, &st->qid, st, new);
563 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
565 * @flags: flags to convert
567 static int v9fs_at_to_dotl_flags(int flags)
570 if (flags & AT_REMOVEDIR)
571 rflags |= P9_DOTL_AT_REMOVEDIR;
576 * v9fs_dec_count - helper functon to drop i_nlink.
578 * If a directory had nlink <= 2 (including . and ..), then we should not drop
579 * the link count, which indicates the underlying exported fs doesn't maintain
580 * nlink accurately. e.g.
581 * - overlayfs sets nlink to 1 for merged dir
582 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
583 * than EXT4_LINK_MAX (65000) links.
585 * @inode: inode whose nlink is being dropped
587 static void v9fs_dec_count(struct inode *inode)
589 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
594 * v9fs_remove - helper function to remove files and directories
595 * @dir: directory inode that is being deleted
596 * @dentry: dentry that is being deleted
597 * @flags: removing a directory
601 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
604 int retval = -EOPNOTSUPP;
605 struct p9_fid *v9fid, *dfid;
606 struct v9fs_session_info *v9ses;
608 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
611 v9ses = v9fs_inode2v9ses(dir);
612 inode = d_inode(dentry);
613 dfid = v9fs_parent_fid(dentry);
615 retval = PTR_ERR(dfid);
616 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
619 if (v9fs_proto_dotl(v9ses))
620 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
621 v9fs_at_to_dotl_flags(flags));
622 if (retval == -EOPNOTSUPP) {
623 /* Try the one based on path */
624 v9fid = v9fs_fid_clone(dentry);
626 return PTR_ERR(v9fid);
627 retval = p9_client_remove(v9fid);
631 * directories on unlink should have zero
634 if (flags & AT_REMOVEDIR) {
638 v9fs_dec_count(inode);
640 v9fs_invalidate_inode_attr(inode);
641 v9fs_invalidate_inode_attr(dir);
647 * v9fs_create - Create a file
648 * @v9ses: session information
649 * @dir: directory that dentry is being created in
650 * @dentry: dentry that is being created
651 * @extension: 9p2000.u extension string to support devices, etc.
652 * @perm: create permissions
656 static struct p9_fid *
657 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
658 struct dentry *dentry, char *extension, u32 perm, u8 mode)
661 const unsigned char *name;
662 struct p9_fid *dfid, *ofid, *fid;
665 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
670 name = dentry->d_name.name;
671 dfid = v9fs_parent_fid(dentry);
674 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
678 /* clone a fid to use for creation */
679 ofid = clone_fid(dfid);
682 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
686 err = p9_client_fcreate(ofid, name, perm, mode, extension);
688 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
692 if (!(perm & P9_DMLINK)) {
693 /* now walk from the parent so we can get unopened fid */
694 fid = p9_client_walk(dfid, 1, &name, 1);
697 p9_debug(P9_DEBUG_VFS,
698 "p9_client_walk failed %d\n", err);
703 * instantiate inode and assign the unopened fid to the dentry
705 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
707 err = PTR_ERR(inode);
708 p9_debug(P9_DEBUG_VFS,
709 "inode creation failed %d\n", err);
712 v9fs_fid_add(dentry, fid);
713 d_instantiate(dentry, inode);
718 p9_client_clunk(ofid);
721 p9_client_clunk(fid);
727 * v9fs_vfs_create - VFS hook to create a regular file
729 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
732 * @dir: directory inode that is being created
733 * @dentry: dentry that is being deleted
734 * @mode: create permissions
739 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
742 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
743 u32 perm = unixmode2p9mode(v9ses, mode);
747 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
751 v9fs_invalidate_inode_attr(dir);
752 p9_client_clunk(fid);
758 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
759 * @dir: inode that is being unlinked
760 * @dentry: dentry that is being unlinked
761 * @mode: mode for new directory
765 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
770 struct v9fs_session_info *v9ses;
772 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
774 v9ses = v9fs_inode2v9ses(dir);
775 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
776 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
782 v9fs_invalidate_inode_attr(dir);
786 p9_client_clunk(fid);
792 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
793 * @dir: inode that is being walked from
794 * @dentry: dentry that is being walked to?
795 * @flags: lookup flags (unused)
799 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
803 struct v9fs_session_info *v9ses;
804 struct p9_fid *dfid, *fid;
806 const unsigned char *name;
808 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
809 dir, dentry, dentry, flags);
811 if (dentry->d_name.len > NAME_MAX)
812 return ERR_PTR(-ENAMETOOLONG);
814 v9ses = v9fs_inode2v9ses(dir);
815 /* We can walk d_parent because we hold the dir->i_mutex */
816 dfid = v9fs_parent_fid(dentry);
818 return ERR_CAST(dfid);
821 * Make sure we don't use a wrong inode due to parallel
822 * unlink. For cached mode create calls request for new
823 * inode. But with cache disabled, lookup should do this.
825 name = dentry->d_name.name;
826 fid = p9_client_walk(dfid, 1, &name, 1);
827 if (fid == ERR_PTR(-ENOENT))
829 else if (IS_ERR(fid))
830 inode = ERR_CAST(fid);
831 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
832 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
834 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
836 * If we had a rename on the server and a parallel lookup
837 * for the new name, then make sure we instantiate with
838 * the new name. ie look up for a/b, while on server somebody
839 * moved b under k and client parallely did a lookup for
842 res = d_splice_alias(inode, dentry);
845 v9fs_fid_add(dentry, fid);
846 else if (!IS_ERR(res))
847 v9fs_fid_add(res, fid);
849 p9_client_clunk(fid);
855 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
856 struct file *file, unsigned flags, umode_t mode)
860 struct v9fs_inode *v9inode;
861 struct v9fs_session_info *v9ses;
862 struct p9_fid *fid, *inode_fid;
863 struct dentry *res = NULL;
865 if (d_in_lookup(dentry)) {
866 res = v9fs_vfs_lookup(dir, dentry, 0);
875 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
876 return finish_no_open(file, res);
880 v9ses = v9fs_inode2v9ses(dir);
881 perm = unixmode2p9mode(v9ses, mode);
882 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
883 v9fs_uflags2omode(flags,
884 v9fs_proto_dotu(v9ses)));
891 v9fs_invalidate_inode_attr(dir);
892 v9inode = V9FS_I(d_inode(dentry));
893 mutex_lock(&v9inode->v_mutex);
894 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
895 !v9inode->writeback_fid &&
896 ((flags & O_ACCMODE) != O_RDONLY)) {
898 * clone a fid and add it to writeback_fid
899 * we do it during open time instead of
900 * page dirty time via write_begin/page_mkwrite
901 * because we want write after unlink usecase
904 inode_fid = v9fs_writeback_fid(dentry);
905 if (IS_ERR(inode_fid)) {
906 err = PTR_ERR(inode_fid);
907 mutex_unlock(&v9inode->v_mutex);
910 v9inode->writeback_fid = (void *) inode_fid;
912 mutex_unlock(&v9inode->v_mutex);
913 err = finish_open(file, dentry, generic_file_open);
917 file->private_data = fid;
918 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
919 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
921 file->f_mode |= FMODE_CREATED;
928 p9_client_clunk(fid);
933 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
934 * @i: inode that is being unlinked
935 * @d: dentry that is being unlinked
939 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
941 return v9fs_remove(i, d, 0);
945 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
946 * @i: inode that is being unlinked
947 * @d: dentry that is being unlinked
951 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
953 return v9fs_remove(i, d, AT_REMOVEDIR);
957 * v9fs_vfs_rename - VFS hook to rename an inode
958 * @old_dir: old dir inode
959 * @old_dentry: old dentry
960 * @new_dir: new dir inode
961 * @new_dentry: new dentry
966 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
967 struct inode *new_dir, struct dentry *new_dentry,
971 struct inode *old_inode;
972 struct inode *new_inode;
973 struct v9fs_session_info *v9ses;
974 struct p9_fid *oldfid;
975 struct p9_fid *olddirfid;
976 struct p9_fid *newdirfid;
977 struct p9_wstat wstat;
982 p9_debug(P9_DEBUG_VFS, "\n");
984 old_inode = d_inode(old_dentry);
985 new_inode = d_inode(new_dentry);
986 v9ses = v9fs_inode2v9ses(old_inode);
987 oldfid = v9fs_fid_lookup(old_dentry);
989 return PTR_ERR(oldfid);
991 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
992 if (IS_ERR(olddirfid)) {
993 retval = PTR_ERR(olddirfid);
997 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
998 if (IS_ERR(newdirfid)) {
999 retval = PTR_ERR(newdirfid);
1003 down_write(&v9ses->rename_sem);
1004 if (v9fs_proto_dotl(v9ses)) {
1005 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
1006 newdirfid, new_dentry->d_name.name);
1007 if (retval == -EOPNOTSUPP)
1008 retval = p9_client_rename(oldfid, newdirfid,
1009 new_dentry->d_name.name);
1010 if (retval != -EOPNOTSUPP)
1013 if (old_dentry->d_parent != new_dentry->d_parent) {
1015 * 9P .u can only handle file rename in the same directory
1018 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1022 v9fs_blank_wstat(&wstat);
1023 wstat.muid = v9ses->uname;
1024 wstat.name = new_dentry->d_name.name;
1025 retval = p9_client_wstat(oldfid, &wstat);
1030 if (S_ISDIR(new_inode->i_mode))
1031 clear_nlink(new_inode);
1033 v9fs_dec_count(new_inode);
1035 if (S_ISDIR(old_inode->i_mode)) {
1038 v9fs_dec_count(old_dir);
1040 v9fs_invalidate_inode_attr(old_inode);
1041 v9fs_invalidate_inode_attr(old_dir);
1042 v9fs_invalidate_inode_attr(new_dir);
1044 /* successful rename */
1045 d_move(old_dentry, new_dentry);
1047 up_write(&v9ses->rename_sem);
1048 p9_client_clunk(newdirfid);
1051 p9_client_clunk(olddirfid);
1058 * v9fs_vfs_getattr - retrieve file metadata
1059 * @path: Object to query
1060 * @stat: metadata structure to populate
1061 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1062 * @flags: AT_STATX_xxx setting
1067 v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
1068 u32 request_mask, unsigned int flags)
1070 struct dentry *dentry = path->dentry;
1071 struct v9fs_session_info *v9ses;
1073 struct p9_wstat *st;
1075 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1076 v9ses = v9fs_dentry2v9ses(dentry);
1077 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1078 generic_fillattr(d_inode(dentry), stat);
1081 fid = v9fs_fid_lookup(dentry);
1083 return PTR_ERR(fid);
1085 st = p9_client_stat(fid);
1089 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1090 generic_fillattr(d_inode(dentry), stat);
1098 * v9fs_vfs_setattr - set file metadata
1099 * @dentry: file whose metadata to set
1100 * @iattr: metadata assignment structure
1104 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1107 struct v9fs_session_info *v9ses;
1109 struct p9_wstat wstat;
1111 p9_debug(P9_DEBUG_VFS, "\n");
1112 retval = setattr_prepare(dentry, iattr);
1117 v9ses = v9fs_dentry2v9ses(dentry);
1118 fid = v9fs_fid_lookup(dentry);
1120 return PTR_ERR(fid);
1122 v9fs_blank_wstat(&wstat);
1123 if (iattr->ia_valid & ATTR_MODE)
1124 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1126 if (iattr->ia_valid & ATTR_MTIME)
1127 wstat.mtime = iattr->ia_mtime.tv_sec;
1129 if (iattr->ia_valid & ATTR_ATIME)
1130 wstat.atime = iattr->ia_atime.tv_sec;
1132 if (iattr->ia_valid & ATTR_SIZE)
1133 wstat.length = iattr->ia_size;
1135 if (v9fs_proto_dotu(v9ses)) {
1136 if (iattr->ia_valid & ATTR_UID)
1137 wstat.n_uid = iattr->ia_uid;
1139 if (iattr->ia_valid & ATTR_GID)
1140 wstat.n_gid = iattr->ia_gid;
1143 /* Write all dirty data */
1144 if (d_is_reg(dentry))
1145 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1147 retval = p9_client_wstat(fid, &wstat);
1151 if ((iattr->ia_valid & ATTR_SIZE) &&
1152 iattr->ia_size != i_size_read(d_inode(dentry)))
1153 truncate_setsize(d_inode(dentry), iattr->ia_size);
1155 v9fs_invalidate_inode_attr(d_inode(dentry));
1157 setattr_copy(d_inode(dentry), iattr);
1158 mark_inode_dirty(d_inode(dentry));
1163 * v9fs_stat2inode - populate an inode structure with mistat info
1164 * @stat: Plan 9 metadata (mistat) structure
1165 * @inode: inode to populate
1166 * @sb: superblock of filesystem
1167 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1172 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1173 struct super_block *sb, unsigned int flags)
1178 unsigned int i_nlink;
1179 struct v9fs_session_info *v9ses = sb->s_fs_info;
1180 struct v9fs_inode *v9inode = V9FS_I(inode);
1182 set_nlink(inode, 1);
1184 inode->i_atime.tv_sec = stat->atime;
1185 inode->i_mtime.tv_sec = stat->mtime;
1186 inode->i_ctime.tv_sec = stat->mtime;
1188 inode->i_uid = v9ses->dfltuid;
1189 inode->i_gid = v9ses->dfltgid;
1191 if (v9fs_proto_dotu(v9ses)) {
1192 inode->i_uid = stat->n_uid;
1193 inode->i_gid = stat->n_gid;
1195 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1196 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1198 * Hadlink support got added later to
1199 * to the .u extension. So there can be
1200 * server out there that doesn't support
1201 * this even with .u extension. So check
1202 * for non NULL stat->extension
1204 strlcpy(ext, stat->extension, sizeof(ext));
1205 /* HARDLINKCOUNT %u */
1206 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1207 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1208 set_nlink(inode, i_nlink);
1211 mode = p9mode2perm(v9ses, stat);
1212 mode |= inode->i_mode & ~S_IALLUGO;
1213 inode->i_mode = mode;
1215 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1216 v9fs_i_size_write(inode, stat->length);
1217 /* not real number of blocks, but 512 byte ones ... */
1218 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1219 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1223 * v9fs_qid2ino - convert qid into inode number
1226 * BUG: potential for inode number collisions?
1229 ino_t v9fs_qid2ino(struct p9_qid *qid)
1231 u64 path = qid->path + 2;
1234 if (sizeof(ino_t) == sizeof(path))
1235 memcpy(&i, &path, sizeof(ino_t));
1237 i = (ino_t) (path ^ (path >> 32));
1243 * v9fs_vfs_get_link - follow a symlink path
1244 * @dentry: dentry for symlink
1245 * @inode: inode for symlink
1246 * @done: delayed call for when we are done with the return value
1249 static const char *v9fs_vfs_get_link(struct dentry *dentry,
1250 struct inode *inode,
1251 struct delayed_call *done)
1253 struct v9fs_session_info *v9ses;
1255 struct p9_wstat *st;
1259 return ERR_PTR(-ECHILD);
1261 v9ses = v9fs_dentry2v9ses(dentry);
1262 fid = v9fs_fid_lookup(dentry);
1263 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1266 return ERR_CAST(fid);
1268 if (!v9fs_proto_dotu(v9ses))
1269 return ERR_PTR(-EBADF);
1271 st = p9_client_stat(fid);
1273 return ERR_CAST(st);
1275 if (!(st->mode & P9_DMSYMLINK)) {
1278 return ERR_PTR(-EINVAL);
1280 res = st->extension;
1281 st->extension = NULL;
1282 if (strlen(res) >= PATH_MAX)
1283 res[PATH_MAX - 1] = '\0';
1287 set_delayed_call(done, kfree_link, res);
1292 * v9fs_vfs_mkspecial - create a special file
1293 * @dir: inode to create special file in
1294 * @dentry: dentry to create
1295 * @perm: mode to create special file
1296 * @extension: 9p2000.u format extension string representing special file
1300 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1301 u32 perm, const char *extension)
1304 struct v9fs_session_info *v9ses;
1306 v9ses = v9fs_inode2v9ses(dir);
1307 if (!v9fs_proto_dotu(v9ses)) {
1308 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1312 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1315 return PTR_ERR(fid);
1317 v9fs_invalidate_inode_attr(dir);
1318 p9_client_clunk(fid);
1323 * v9fs_vfs_symlink - helper function to create symlinks
1324 * @dir: directory inode containing symlink
1325 * @dentry: dentry for symlink
1326 * @symname: symlink data
1328 * See Also: 9P2000.u RFC for more information
1333 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1335 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1336 dir->i_ino, dentry, symname);
1338 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1341 #define U32_MAX_DIGITS 10
1344 * v9fs_vfs_link - create a hardlink
1345 * @old_dentry: dentry for file to link to
1346 * @dir: inode destination for new link
1347 * @dentry: dentry for link
1352 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1353 struct dentry *dentry)
1356 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1357 struct p9_fid *oldfid;
1359 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1360 dir->i_ino, dentry, old_dentry);
1362 oldfid = v9fs_fid_clone(old_dentry);
1364 return PTR_ERR(oldfid);
1366 sprintf(name, "%d\n", oldfid->fid);
1367 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1369 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1370 v9fs_invalidate_inode_attr(dir);
1372 p9_client_clunk(oldfid);
1377 * v9fs_vfs_mknod - create a special file
1378 * @dir: inode destination for new link
1379 * @dentry: dentry for file
1380 * @mode: mode for creation
1381 * @rdev: device associated with special file
1386 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1388 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1390 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1393 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1394 dir->i_ino, dentry, mode,
1395 MAJOR(rdev), MINOR(rdev));
1397 /* build extension */
1399 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1400 else if (S_ISCHR(mode))
1401 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1405 perm = unixmode2p9mode(v9ses, mode);
1406 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1411 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1415 struct p9_wstat *st;
1416 struct v9fs_session_info *v9ses;
1419 v9ses = v9fs_inode2v9ses(inode);
1420 st = p9_client_stat(fid);
1424 * Don't update inode if the file type is different
1426 umode = p9mode2unixmode(v9ses, st, &rdev);
1427 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1431 * We don't want to refresh inode->i_size,
1432 * because we may have cached data
1434 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1435 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1436 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1443 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1444 .create = v9fs_vfs_create,
1445 .lookup = v9fs_vfs_lookup,
1446 .atomic_open = v9fs_vfs_atomic_open,
1447 .symlink = v9fs_vfs_symlink,
1448 .link = v9fs_vfs_link,
1449 .unlink = v9fs_vfs_unlink,
1450 .mkdir = v9fs_vfs_mkdir,
1451 .rmdir = v9fs_vfs_rmdir,
1452 .mknod = v9fs_vfs_mknod,
1453 .rename = v9fs_vfs_rename,
1454 .getattr = v9fs_vfs_getattr,
1455 .setattr = v9fs_vfs_setattr,
1458 static const struct inode_operations v9fs_dir_inode_operations = {
1459 .create = v9fs_vfs_create,
1460 .lookup = v9fs_vfs_lookup,
1461 .atomic_open = v9fs_vfs_atomic_open,
1462 .unlink = v9fs_vfs_unlink,
1463 .mkdir = v9fs_vfs_mkdir,
1464 .rmdir = v9fs_vfs_rmdir,
1465 .mknod = v9fs_vfs_mknod,
1466 .rename = v9fs_vfs_rename,
1467 .getattr = v9fs_vfs_getattr,
1468 .setattr = v9fs_vfs_setattr,
1471 static const struct inode_operations v9fs_file_inode_operations = {
1472 .getattr = v9fs_vfs_getattr,
1473 .setattr = v9fs_vfs_setattr,
1476 static const struct inode_operations v9fs_symlink_inode_operations = {
1477 .get_link = v9fs_vfs_get_link,
1478 .getattr = v9fs_vfs_getattr,
1479 .setattr = v9fs_vfs_setattr,