1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/9p/vfs_inode.c
5 * This file contains vfs inode ops for the 9P2000 protocol.
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/module.h>
14 #include <linux/errno.h>
16 #include <linux/file.h>
17 #include <linux/pagemap.h>
18 #include <linux/stat.h>
19 #include <linux/string.h>
20 #include <linux/inet.h>
21 #include <linux/namei.h>
22 #include <linux/idr.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/xattr.h>
26 #include <linux/posix_acl.h>
27 #include <net/9p/9p.h>
28 #include <net/9p/client.h>
37 static const struct inode_operations v9fs_dir_inode_operations;
38 static const struct inode_operations v9fs_dir_inode_operations_dotu;
39 static const struct inode_operations v9fs_file_inode_operations;
40 static const struct inode_operations v9fs_symlink_inode_operations;
43 * unixmode2p9mode - convert unix mode bits to plan 9
44 * @v9ses: v9fs session information
45 * @mode: mode to convert
49 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
55 if (v9fs_proto_dotu(v9ses)) {
56 if (v9ses->nodev == 0) {
60 res |= P9_DMNAMEDPIPE;
67 if ((mode & S_ISUID) == S_ISUID)
69 if ((mode & S_ISGID) == S_ISGID)
71 if ((mode & S_ISVTX) == S_ISVTX)
78 * p9mode2perm- convert plan9 mode bits to unix permission bits
79 * @v9ses: v9fs session information
80 * @stat: p9_wstat from which mode need to be derived
83 static int p9mode2perm(struct v9fs_session_info *v9ses,
84 struct p9_wstat *stat)
87 int mode = stat->mode;
89 res = mode & S_IALLUGO;
90 if (v9fs_proto_dotu(v9ses)) {
91 if ((mode & P9_DMSETUID) == P9_DMSETUID)
94 if ((mode & P9_DMSETGID) == P9_DMSETGID)
97 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
104 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
105 * @v9ses: v9fs session information
106 * @stat: p9_wstat from which mode need to be derived
107 * @rdev: major number, minor number in case of device files.
110 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
111 struct p9_wstat *stat, dev_t *rdev)
114 u32 mode = stat->mode;
117 res = p9mode2perm(v9ses, stat);
119 if ((mode & P9_DMDIR) == P9_DMDIR)
121 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
123 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
124 && (v9ses->nodev == 0))
126 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
127 && (v9ses->nodev == 0))
129 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
130 && (v9ses->nodev == 0)) {
131 char type = 0, ext[32];
132 int major = -1, minor = -1;
134 strlcpy(ext, stat->extension, sizeof(ext));
135 sscanf(ext, "%c %i %i", &type, &major, &minor);
144 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
145 type, stat->extension);
147 *rdev = MKDEV(major, minor);
155 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
156 * @uflags: flags to convert
157 * @extended: if .u extensions are active
160 int v9fs_uflags2omode(int uflags, int extended)
184 if (uflags & O_APPEND)
192 * v9fs_blank_wstat - helper function to setup a 9P stat structure
193 * @wstat: structure to initialize
198 v9fs_blank_wstat(struct p9_wstat *wstat)
202 wstat->qid.type = ~0;
203 wstat->qid.version = ~0;
204 *((long long *)&wstat->qid.path) = ~0;
213 wstat->n_uid = INVALID_UID;
214 wstat->n_gid = INVALID_GID;
215 wstat->n_muid = INVALID_UID;
216 wstat->extension = NULL;
220 * v9fs_alloc_inode - helper function to allocate an inode
223 struct inode *v9fs_alloc_inode(struct super_block *sb)
225 struct v9fs_inode *v9inode;
226 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL);
229 #ifdef CONFIG_9P_FSCACHE
230 v9inode->fscache = NULL;
231 mutex_init(&v9inode->fscache_lock);
233 v9inode->writeback_fid = NULL;
234 v9inode->cache_validity = 0;
235 mutex_init(&v9inode->v_mutex);
236 return &v9inode->vfs_inode;
240 * v9fs_free_inode - destroy an inode
244 void v9fs_free_inode(struct inode *inode)
246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
249 int v9fs_init_inode(struct v9fs_session_info *v9ses,
250 struct inode *inode, umode_t mode, dev_t rdev)
254 inode_init_owner(inode, NULL, mode);
256 inode->i_rdev = rdev;
257 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
258 inode->i_mapping->a_ops = &v9fs_addr_operations;
260 switch (mode & S_IFMT) {
265 if (v9fs_proto_dotl(v9ses)) {
266 inode->i_op = &v9fs_file_inode_operations_dotl;
267 } else if (v9fs_proto_dotu(v9ses)) {
268 inode->i_op = &v9fs_file_inode_operations;
270 p9_debug(P9_DEBUG_ERROR,
271 "special files without extended mode\n");
275 init_special_inode(inode, inode->i_mode, inode->i_rdev);
278 if (v9fs_proto_dotl(v9ses)) {
279 inode->i_op = &v9fs_file_inode_operations_dotl;
280 if (v9ses->cache == CACHE_LOOSE ||
281 v9ses->cache == CACHE_FSCACHE)
283 &v9fs_cached_file_operations_dotl;
284 else if (v9ses->cache == CACHE_MMAP)
285 inode->i_fop = &v9fs_mmap_file_operations_dotl;
287 inode->i_fop = &v9fs_file_operations_dotl;
289 inode->i_op = &v9fs_file_inode_operations;
290 if (v9ses->cache == CACHE_LOOSE ||
291 v9ses->cache == CACHE_FSCACHE)
293 &v9fs_cached_file_operations;
294 else if (v9ses->cache == CACHE_MMAP)
295 inode->i_fop = &v9fs_mmap_file_operations;
297 inode->i_fop = &v9fs_file_operations;
302 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
303 p9_debug(P9_DEBUG_ERROR,
304 "extended modes used with legacy protocol\n");
309 if (v9fs_proto_dotl(v9ses))
310 inode->i_op = &v9fs_symlink_inode_operations_dotl;
312 inode->i_op = &v9fs_symlink_inode_operations;
317 if (v9fs_proto_dotl(v9ses))
318 inode->i_op = &v9fs_dir_inode_operations_dotl;
319 else if (v9fs_proto_dotu(v9ses))
320 inode->i_op = &v9fs_dir_inode_operations_dotu;
322 inode->i_op = &v9fs_dir_inode_operations;
324 if (v9fs_proto_dotl(v9ses))
325 inode->i_fop = &v9fs_dir_operations_dotl;
327 inode->i_fop = &v9fs_dir_operations;
331 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
332 mode, mode & S_IFMT);
342 * v9fs_get_inode - helper function to setup an inode
344 * @mode: mode to setup inode with
348 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
352 struct v9fs_session_info *v9ses = sb->s_fs_info;
354 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
356 inode = new_inode(sb);
358 pr_warn("%s (%d): Problem allocating inode\n",
359 __func__, task_pid_nr(current));
360 return ERR_PTR(-ENOMEM);
362 err = v9fs_init_inode(v9ses, inode, mode, rdev);
371 * v9fs_clear_inode - release an inode
372 * @inode: inode to release
375 void v9fs_evict_inode(struct inode *inode)
377 struct v9fs_inode *v9inode = V9FS_I(inode);
379 truncate_inode_pages_final(&inode->i_data);
381 filemap_fdatawrite(&inode->i_data);
383 v9fs_cache_inode_put_cookie(inode);
384 /* clunk the fid stashed in writeback_fid */
385 if (v9inode->writeback_fid) {
386 p9_client_clunk(v9inode->writeback_fid);
387 v9inode->writeback_fid = NULL;
391 static int v9fs_test_inode(struct inode *inode, void *data)
395 struct v9fs_inode *v9inode = V9FS_I(inode);
396 struct p9_wstat *st = (struct p9_wstat *)data;
397 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
399 umode = p9mode2unixmode(v9ses, st, &rdev);
400 /* don't match inode of different type */
401 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
404 /* compare qid details */
405 if (memcmp(&v9inode->qid.version,
406 &st->qid.version, sizeof(v9inode->qid.version)))
409 if (v9inode->qid.type != st->qid.type)
412 if (v9inode->qid.path != st->qid.path)
417 static int v9fs_test_new_inode(struct inode *inode, void *data)
422 static int v9fs_set_inode(struct inode *inode, void *data)
424 struct v9fs_inode *v9inode = V9FS_I(inode);
425 struct p9_wstat *st = (struct p9_wstat *)data;
427 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
431 static struct inode *v9fs_qid_iget(struct super_block *sb,
441 struct v9fs_session_info *v9ses = sb->s_fs_info;
442 int (*test)(struct inode *, void *);
445 test = v9fs_test_new_inode;
447 test = v9fs_test_inode;
449 i_ino = v9fs_qid2ino(qid);
450 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
452 return ERR_PTR(-ENOMEM);
453 if (!(inode->i_state & I_NEW))
456 * initialize the inode with the stat info
457 * FIXME!! we may need support for stale inodes
460 inode->i_ino = i_ino;
461 umode = p9mode2unixmode(v9ses, st, &rdev);
462 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
466 v9fs_stat2inode(st, inode, sb, 0);
467 v9fs_cache_inode_get_cookie(inode);
468 unlock_new_inode(inode);
472 return ERR_PTR(retval);
477 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
478 struct super_block *sb, int new)
481 struct inode *inode = NULL;
483 st = p9_client_stat(fid);
487 inode = v9fs_qid_iget(sb, &st->qid, st, new);
494 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
496 * @flags: flags to convert
498 static int v9fs_at_to_dotl_flags(int flags)
501 if (flags & AT_REMOVEDIR)
502 rflags |= P9_DOTL_AT_REMOVEDIR;
507 * v9fs_dec_count - helper functon to drop i_nlink.
509 * If a directory had nlink <= 2 (including . and ..), then we should not drop
510 * the link count, which indicates the underlying exported fs doesn't maintain
511 * nlink accurately. e.g.
512 * - overlayfs sets nlink to 1 for merged dir
513 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
514 * than EXT4_LINK_MAX (65000) links.
516 * @inode: inode whose nlink is being dropped
518 static void v9fs_dec_count(struct inode *inode)
520 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
525 * v9fs_remove - helper function to remove files and directories
526 * @dir: directory inode that is being deleted
527 * @dentry: dentry that is being deleted
528 * @flags: removing a directory
532 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
535 int retval = -EOPNOTSUPP;
536 struct p9_fid *v9fid, *dfid;
537 struct v9fs_session_info *v9ses;
539 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
542 v9ses = v9fs_inode2v9ses(dir);
543 inode = d_inode(dentry);
544 dfid = v9fs_parent_fid(dentry);
546 retval = PTR_ERR(dfid);
547 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
550 if (v9fs_proto_dotl(v9ses))
551 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
552 v9fs_at_to_dotl_flags(flags));
553 if (retval == -EOPNOTSUPP) {
554 /* Try the one based on path */
555 v9fid = v9fs_fid_clone(dentry);
557 return PTR_ERR(v9fid);
558 retval = p9_client_remove(v9fid);
562 * directories on unlink should have zero
565 if (flags & AT_REMOVEDIR) {
569 v9fs_dec_count(inode);
571 v9fs_invalidate_inode_attr(inode);
572 v9fs_invalidate_inode_attr(dir);
578 * v9fs_create - Create a file
579 * @v9ses: session information
580 * @dir: directory that dentry is being created in
581 * @dentry: dentry that is being created
582 * @extension: 9p2000.u extension string to support devices, etc.
583 * @perm: create permissions
587 static struct p9_fid *
588 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
589 struct dentry *dentry, char *extension, u32 perm, u8 mode)
592 const unsigned char *name;
593 struct p9_fid *dfid, *ofid, *fid;
596 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
601 name = dentry->d_name.name;
602 dfid = v9fs_parent_fid(dentry);
605 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
609 /* clone a fid to use for creation */
610 ofid = clone_fid(dfid);
613 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
617 err = p9_client_fcreate(ofid, name, perm, mode, extension);
619 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
623 if (!(perm & P9_DMLINK)) {
624 /* now walk from the parent so we can get unopened fid */
625 fid = p9_client_walk(dfid, 1, &name, 1);
628 p9_debug(P9_DEBUG_VFS,
629 "p9_client_walk failed %d\n", err);
634 * instantiate inode and assign the unopened fid to the dentry
636 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
638 err = PTR_ERR(inode);
639 p9_debug(P9_DEBUG_VFS,
640 "inode creation failed %d\n", err);
643 v9fs_fid_add(dentry, fid);
644 d_instantiate(dentry, inode);
649 p9_client_clunk(ofid);
652 p9_client_clunk(fid);
658 * v9fs_vfs_create - VFS hook to create a regular file
660 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
663 * @dir: directory inode that is being created
664 * @dentry: dentry that is being deleted
665 * @mode: create permissions
670 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
673 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
674 u32 perm = unixmode2p9mode(v9ses, mode);
678 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
682 v9fs_invalidate_inode_attr(dir);
683 p9_client_clunk(fid);
689 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
690 * @dir: inode that is being unlinked
691 * @dentry: dentry that is being unlinked
692 * @mode: mode for new directory
696 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
701 struct v9fs_session_info *v9ses;
703 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
705 v9ses = v9fs_inode2v9ses(dir);
706 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
707 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
713 v9fs_invalidate_inode_attr(dir);
717 p9_client_clunk(fid);
723 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
724 * @dir: inode that is being walked from
725 * @dentry: dentry that is being walked to?
726 * @flags: lookup flags (unused)
730 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
734 struct v9fs_session_info *v9ses;
735 struct p9_fid *dfid, *fid;
737 const unsigned char *name;
739 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
740 dir, dentry, dentry, flags);
742 if (dentry->d_name.len > NAME_MAX)
743 return ERR_PTR(-ENAMETOOLONG);
745 v9ses = v9fs_inode2v9ses(dir);
746 /* We can walk d_parent because we hold the dir->i_mutex */
747 dfid = v9fs_parent_fid(dentry);
749 return ERR_CAST(dfid);
752 * Make sure we don't use a wrong inode due to parallel
753 * unlink. For cached mode create calls request for new
754 * inode. But with cache disabled, lookup should do this.
756 name = dentry->d_name.name;
757 fid = p9_client_walk(dfid, 1, &name, 1);
758 if (fid == ERR_PTR(-ENOENT))
760 else if (IS_ERR(fid))
761 inode = ERR_CAST(fid);
762 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
763 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
765 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
767 * If we had a rename on the server and a parallel lookup
768 * for the new name, then make sure we instantiate with
769 * the new name. ie look up for a/b, while on server somebody
770 * moved b under k and client parallely did a lookup for
773 res = d_splice_alias(inode, dentry);
776 v9fs_fid_add(dentry, fid);
777 else if (!IS_ERR(res))
778 v9fs_fid_add(res, fid);
780 p9_client_clunk(fid);
786 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
787 struct file *file, unsigned flags, umode_t mode)
791 struct v9fs_inode *v9inode;
792 struct v9fs_session_info *v9ses;
793 struct p9_fid *fid, *inode_fid;
794 struct dentry *res = NULL;
796 if (d_in_lookup(dentry)) {
797 res = v9fs_vfs_lookup(dir, dentry, 0);
806 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
807 return finish_no_open(file, res);
811 v9ses = v9fs_inode2v9ses(dir);
812 perm = unixmode2p9mode(v9ses, mode);
813 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
814 v9fs_uflags2omode(flags,
815 v9fs_proto_dotu(v9ses)));
822 v9fs_invalidate_inode_attr(dir);
823 v9inode = V9FS_I(d_inode(dentry));
824 mutex_lock(&v9inode->v_mutex);
825 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
826 !v9inode->writeback_fid &&
827 ((flags & O_ACCMODE) != O_RDONLY)) {
829 * clone a fid and add it to writeback_fid
830 * we do it during open time instead of
831 * page dirty time via write_begin/page_mkwrite
832 * because we want write after unlink usecase
835 inode_fid = v9fs_writeback_fid(dentry);
836 if (IS_ERR(inode_fid)) {
837 err = PTR_ERR(inode_fid);
838 mutex_unlock(&v9inode->v_mutex);
841 v9inode->writeback_fid = (void *) inode_fid;
843 mutex_unlock(&v9inode->v_mutex);
844 err = finish_open(file, dentry, generic_file_open);
848 file->private_data = fid;
849 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
850 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
852 file->f_mode |= FMODE_CREATED;
859 p9_client_clunk(fid);
864 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
865 * @i: inode that is being unlinked
866 * @d: dentry that is being unlinked
870 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
872 return v9fs_remove(i, d, 0);
876 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
877 * @i: inode that is being unlinked
878 * @d: dentry that is being unlinked
882 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
884 return v9fs_remove(i, d, AT_REMOVEDIR);
888 * v9fs_vfs_rename - VFS hook to rename an inode
889 * @old_dir: old dir inode
890 * @old_dentry: old dentry
891 * @new_dir: new dir inode
892 * @new_dentry: new dentry
897 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
898 struct inode *new_dir, struct dentry *new_dentry,
902 struct inode *old_inode;
903 struct inode *new_inode;
904 struct v9fs_session_info *v9ses;
905 struct p9_fid *oldfid;
906 struct p9_fid *olddirfid;
907 struct p9_fid *newdirfid;
908 struct p9_wstat wstat;
913 p9_debug(P9_DEBUG_VFS, "\n");
915 old_inode = d_inode(old_dentry);
916 new_inode = d_inode(new_dentry);
917 v9ses = v9fs_inode2v9ses(old_inode);
918 oldfid = v9fs_fid_lookup(old_dentry);
920 return PTR_ERR(oldfid);
922 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
923 if (IS_ERR(olddirfid)) {
924 retval = PTR_ERR(olddirfid);
928 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
929 if (IS_ERR(newdirfid)) {
930 retval = PTR_ERR(newdirfid);
934 down_write(&v9ses->rename_sem);
935 if (v9fs_proto_dotl(v9ses)) {
936 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
937 newdirfid, new_dentry->d_name.name);
938 if (retval == -EOPNOTSUPP)
939 retval = p9_client_rename(oldfid, newdirfid,
940 new_dentry->d_name.name);
941 if (retval != -EOPNOTSUPP)
944 if (old_dentry->d_parent != new_dentry->d_parent) {
946 * 9P .u can only handle file rename in the same directory
949 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
953 v9fs_blank_wstat(&wstat);
954 wstat.muid = v9ses->uname;
955 wstat.name = new_dentry->d_name.name;
956 retval = p9_client_wstat(oldfid, &wstat);
961 if (S_ISDIR(new_inode->i_mode))
962 clear_nlink(new_inode);
964 v9fs_dec_count(new_inode);
966 if (S_ISDIR(old_inode->i_mode)) {
969 v9fs_dec_count(old_dir);
971 v9fs_invalidate_inode_attr(old_inode);
972 v9fs_invalidate_inode_attr(old_dir);
973 v9fs_invalidate_inode_attr(new_dir);
975 /* successful rename */
976 d_move(old_dentry, new_dentry);
978 up_write(&v9ses->rename_sem);
979 p9_client_clunk(newdirfid);
982 p9_client_clunk(olddirfid);
989 * v9fs_vfs_getattr - retrieve file metadata
990 * @path: Object to query
991 * @stat: metadata structure to populate
992 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
993 * @flags: AT_STATX_xxx setting
998 v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
999 u32 request_mask, unsigned int flags)
1001 struct dentry *dentry = path->dentry;
1002 struct v9fs_session_info *v9ses;
1004 struct p9_wstat *st;
1006 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1007 v9ses = v9fs_dentry2v9ses(dentry);
1008 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1009 generic_fillattr(d_inode(dentry), stat);
1012 fid = v9fs_fid_lookup(dentry);
1014 return PTR_ERR(fid);
1016 st = p9_client_stat(fid);
1020 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1021 generic_fillattr(d_inode(dentry), stat);
1029 * v9fs_vfs_setattr - set file metadata
1030 * @dentry: file whose metadata to set
1031 * @iattr: metadata assignment structure
1035 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1038 struct v9fs_session_info *v9ses;
1039 struct p9_fid *fid = NULL;
1040 struct p9_wstat wstat;
1042 p9_debug(P9_DEBUG_VFS, "\n");
1043 retval = setattr_prepare(dentry, iattr);
1048 v9ses = v9fs_dentry2v9ses(dentry);
1049 if (iattr->ia_valid & ATTR_FILE) {
1050 fid = iattr->ia_file->private_data;
1054 fid = v9fs_fid_lookup(dentry);
1056 return PTR_ERR(fid);
1058 v9fs_blank_wstat(&wstat);
1059 if (iattr->ia_valid & ATTR_MODE)
1060 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1062 if (iattr->ia_valid & ATTR_MTIME)
1063 wstat.mtime = iattr->ia_mtime.tv_sec;
1065 if (iattr->ia_valid & ATTR_ATIME)
1066 wstat.atime = iattr->ia_atime.tv_sec;
1068 if (iattr->ia_valid & ATTR_SIZE)
1069 wstat.length = iattr->ia_size;
1071 if (v9fs_proto_dotu(v9ses)) {
1072 if (iattr->ia_valid & ATTR_UID)
1073 wstat.n_uid = iattr->ia_uid;
1075 if (iattr->ia_valid & ATTR_GID)
1076 wstat.n_gid = iattr->ia_gid;
1079 /* Write all dirty data */
1080 if (d_is_reg(dentry))
1081 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1083 retval = p9_client_wstat(fid, &wstat);
1087 if ((iattr->ia_valid & ATTR_SIZE) &&
1088 iattr->ia_size != i_size_read(d_inode(dentry)))
1089 truncate_setsize(d_inode(dentry), iattr->ia_size);
1091 v9fs_invalidate_inode_attr(d_inode(dentry));
1093 setattr_copy(d_inode(dentry), iattr);
1094 mark_inode_dirty(d_inode(dentry));
1099 * v9fs_stat2inode - populate an inode structure with mistat info
1100 * @stat: Plan 9 metadata (mistat) structure
1101 * @inode: inode to populate
1102 * @sb: superblock of filesystem
1103 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1108 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1109 struct super_block *sb, unsigned int flags)
1114 unsigned int i_nlink;
1115 struct v9fs_session_info *v9ses = sb->s_fs_info;
1116 struct v9fs_inode *v9inode = V9FS_I(inode);
1118 set_nlink(inode, 1);
1120 inode->i_atime.tv_sec = stat->atime;
1121 inode->i_mtime.tv_sec = stat->mtime;
1122 inode->i_ctime.tv_sec = stat->mtime;
1124 inode->i_uid = v9ses->dfltuid;
1125 inode->i_gid = v9ses->dfltgid;
1127 if (v9fs_proto_dotu(v9ses)) {
1128 inode->i_uid = stat->n_uid;
1129 inode->i_gid = stat->n_gid;
1131 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1132 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1134 * Hadlink support got added later to
1135 * to the .u extension. So there can be
1136 * server out there that doesn't support
1137 * this even with .u extension. So check
1138 * for non NULL stat->extension
1140 strlcpy(ext, stat->extension, sizeof(ext));
1141 /* HARDLINKCOUNT %u */
1142 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1143 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1144 set_nlink(inode, i_nlink);
1147 mode = p9mode2perm(v9ses, stat);
1148 mode |= inode->i_mode & ~S_IALLUGO;
1149 inode->i_mode = mode;
1151 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1152 v9fs_i_size_write(inode, stat->length);
1153 /* not real number of blocks, but 512 byte ones ... */
1154 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1155 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1159 * v9fs_qid2ino - convert qid into inode number
1162 * BUG: potential for inode number collisions?
1165 ino_t v9fs_qid2ino(struct p9_qid *qid)
1167 u64 path = qid->path + 2;
1170 if (sizeof(ino_t) == sizeof(path))
1171 memcpy(&i, &path, sizeof(ino_t));
1173 i = (ino_t) (path ^ (path >> 32));
1179 * v9fs_vfs_get_link - follow a symlink path
1180 * @dentry: dentry for symlink
1181 * @inode: inode for symlink
1182 * @done: delayed call for when we are done with the return value
1185 static const char *v9fs_vfs_get_link(struct dentry *dentry,
1186 struct inode *inode,
1187 struct delayed_call *done)
1189 struct v9fs_session_info *v9ses;
1191 struct p9_wstat *st;
1195 return ERR_PTR(-ECHILD);
1197 v9ses = v9fs_dentry2v9ses(dentry);
1198 fid = v9fs_fid_lookup(dentry);
1199 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1202 return ERR_CAST(fid);
1204 if (!v9fs_proto_dotu(v9ses))
1205 return ERR_PTR(-EBADF);
1207 st = p9_client_stat(fid);
1209 return ERR_CAST(st);
1211 if (!(st->mode & P9_DMSYMLINK)) {
1214 return ERR_PTR(-EINVAL);
1216 res = st->extension;
1217 st->extension = NULL;
1218 if (strlen(res) >= PATH_MAX)
1219 res[PATH_MAX - 1] = '\0';
1223 set_delayed_call(done, kfree_link, res);
1228 * v9fs_vfs_mkspecial - create a special file
1229 * @dir: inode to create special file in
1230 * @dentry: dentry to create
1231 * @perm: mode to create special file
1232 * @extension: 9p2000.u format extension string representing special file
1236 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1237 u32 perm, const char *extension)
1240 struct v9fs_session_info *v9ses;
1242 v9ses = v9fs_inode2v9ses(dir);
1243 if (!v9fs_proto_dotu(v9ses)) {
1244 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1248 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1251 return PTR_ERR(fid);
1253 v9fs_invalidate_inode_attr(dir);
1254 p9_client_clunk(fid);
1259 * v9fs_vfs_symlink - helper function to create symlinks
1260 * @dir: directory inode containing symlink
1261 * @dentry: dentry for symlink
1262 * @symname: symlink data
1264 * See Also: 9P2000.u RFC for more information
1269 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1271 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1272 dir->i_ino, dentry, symname);
1274 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1277 #define U32_MAX_DIGITS 10
1280 * v9fs_vfs_link - create a hardlink
1281 * @old_dentry: dentry for file to link to
1282 * @dir: inode destination for new link
1283 * @dentry: dentry for link
1288 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1289 struct dentry *dentry)
1292 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1293 struct p9_fid *oldfid;
1295 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1296 dir->i_ino, dentry, old_dentry);
1298 oldfid = v9fs_fid_clone(old_dentry);
1300 return PTR_ERR(oldfid);
1302 sprintf(name, "%d\n", oldfid->fid);
1303 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1305 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1306 v9fs_invalidate_inode_attr(dir);
1308 p9_client_clunk(oldfid);
1313 * v9fs_vfs_mknod - create a special file
1314 * @dir: inode destination for new link
1315 * @dentry: dentry for file
1316 * @mode: mode for creation
1317 * @rdev: device associated with special file
1322 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1324 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1326 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1329 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1330 dir->i_ino, dentry, mode,
1331 MAJOR(rdev), MINOR(rdev));
1333 /* build extension */
1335 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1336 else if (S_ISCHR(mode))
1337 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1341 perm = unixmode2p9mode(v9ses, mode);
1342 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1347 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1351 struct p9_wstat *st;
1352 struct v9fs_session_info *v9ses;
1355 v9ses = v9fs_inode2v9ses(inode);
1356 st = p9_client_stat(fid);
1360 * Don't update inode if the file type is different
1362 umode = p9mode2unixmode(v9ses, st, &rdev);
1363 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1367 * We don't want to refresh inode->i_size,
1368 * because we may have cached data
1370 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1371 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1372 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1379 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1380 .create = v9fs_vfs_create,
1381 .lookup = v9fs_vfs_lookup,
1382 .atomic_open = v9fs_vfs_atomic_open,
1383 .symlink = v9fs_vfs_symlink,
1384 .link = v9fs_vfs_link,
1385 .unlink = v9fs_vfs_unlink,
1386 .mkdir = v9fs_vfs_mkdir,
1387 .rmdir = v9fs_vfs_rmdir,
1388 .mknod = v9fs_vfs_mknod,
1389 .rename = v9fs_vfs_rename,
1390 .getattr = v9fs_vfs_getattr,
1391 .setattr = v9fs_vfs_setattr,
1394 static const struct inode_operations v9fs_dir_inode_operations = {
1395 .create = v9fs_vfs_create,
1396 .lookup = v9fs_vfs_lookup,
1397 .atomic_open = v9fs_vfs_atomic_open,
1398 .unlink = v9fs_vfs_unlink,
1399 .mkdir = v9fs_vfs_mkdir,
1400 .rmdir = v9fs_vfs_rmdir,
1401 .mknod = v9fs_vfs_mknod,
1402 .rename = v9fs_vfs_rename,
1403 .getattr = v9fs_vfs_getattr,
1404 .setattr = v9fs_vfs_setattr,
1407 static const struct inode_operations v9fs_file_inode_operations = {
1408 .getattr = v9fs_vfs_getattr,
1409 .setattr = v9fs_vfs_setattr,
1412 static const struct inode_operations v9fs_symlink_inode_operations = {
1413 .get_link = v9fs_vfs_get_link,
1414 .getattr = v9fs_vfs_getattr,
1415 .setattr = v9fs_vfs_setattr,