1 // SPDX-License-Identifier: GPL-2.0-only
3 * This file contains vfs inode ops for the 9P2000 protocol.
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/module.h>
12 #include <linux/errno.h>
14 #include <linux/file.h>
15 #include <linux/pagemap.h>
16 #include <linux/stat.h>
17 #include <linux/string.h>
18 #include <linux/inet.h>
19 #include <linux/namei.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/xattr.h>
23 #include <linux/posix_acl.h>
24 #include <net/9p/9p.h>
25 #include <net/9p/client.h>
34 static const struct inode_operations v9fs_dir_inode_operations;
35 static const struct inode_operations v9fs_dir_inode_operations_dotu;
36 static const struct inode_operations v9fs_file_inode_operations;
37 static const struct inode_operations v9fs_symlink_inode_operations;
40 * unixmode2p9mode - convert unix mode bits to plan 9
41 * @v9ses: v9fs session information
42 * @mode: mode to convert
46 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
53 if (v9fs_proto_dotu(v9ses)) {
54 if (v9ses->nodev == 0) {
58 res |= P9_DMNAMEDPIPE;
65 if ((mode & S_ISUID) == S_ISUID)
67 if ((mode & S_ISGID) == S_ISGID)
69 if ((mode & S_ISVTX) == S_ISVTX)
76 * p9mode2perm- convert plan9 mode bits to unix permission bits
77 * @v9ses: v9fs session information
78 * @stat: p9_wstat from which mode need to be derived
81 static int p9mode2perm(struct v9fs_session_info *v9ses,
82 struct p9_wstat *stat)
85 int mode = stat->mode;
87 res = mode & S_IALLUGO;
88 if (v9fs_proto_dotu(v9ses)) {
89 if ((mode & P9_DMSETUID) == P9_DMSETUID)
92 if ((mode & P9_DMSETGID) == P9_DMSETGID)
95 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
102 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
103 * @v9ses: v9fs session information
104 * @stat: p9_wstat from which mode need to be derived
105 * @rdev: major number, minor number in case of device files.
108 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
109 struct p9_wstat *stat, dev_t *rdev)
112 u32 mode = stat->mode;
115 res = p9mode2perm(v9ses, stat);
117 if ((mode & P9_DMDIR) == P9_DMDIR)
119 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
121 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
122 && (v9ses->nodev == 0))
124 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
125 && (v9ses->nodev == 0))
127 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
128 && (v9ses->nodev == 0)) {
130 int major = -1, minor = -1;
132 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
134 p9_debug(P9_DEBUG_ERROR,
135 "invalid device string, umode will be bogus: %s\n",
147 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
148 type, stat->extension);
150 *rdev = MKDEV(major, minor);
158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
159 * @uflags: flags to convert
160 * @extended: if .u extensions are active
163 int v9fs_uflags2omode(int uflags, int extended)
187 if (uflags & O_APPEND)
195 * v9fs_blank_wstat - helper function to setup a 9P stat structure
196 * @wstat: structure to initialize
201 v9fs_blank_wstat(struct p9_wstat *wstat)
205 wstat->qid.type = ~0;
206 wstat->qid.version = ~0;
207 *((long long *)&wstat->qid.path) = ~0;
216 wstat->n_uid = INVALID_UID;
217 wstat->n_gid = INVALID_GID;
218 wstat->n_muid = INVALID_UID;
219 wstat->extension = NULL;
223 * v9fs_alloc_inode - helper function to allocate an inode
224 * @sb: The superblock to allocate the inode from
226 struct inode *v9fs_alloc_inode(struct super_block *sb)
228 struct v9fs_inode *v9inode;
230 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
233 v9inode->cache_validity = 0;
234 mutex_init(&v9inode->v_mutex);
235 return &v9inode->netfs.inode;
239 * v9fs_free_inode - destroy an inode
240 * @inode: The inode to be freed
243 void v9fs_free_inode(struct inode *inode)
245 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
249 * Set parameters for the netfs library
251 static void v9fs_set_netfs_context(struct inode *inode)
253 struct v9fs_inode *v9inode = V9FS_I(inode);
254 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops);
257 int v9fs_init_inode(struct v9fs_session_info *v9ses,
258 struct inode *inode, umode_t mode, dev_t rdev)
262 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode);
264 inode->i_rdev = rdev;
265 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
266 inode->i_mapping->a_ops = &v9fs_addr_operations;
267 inode->i_private = NULL;
269 switch (mode & S_IFMT) {
274 if (v9fs_proto_dotl(v9ses)) {
275 inode->i_op = &v9fs_file_inode_operations_dotl;
276 } else if (v9fs_proto_dotu(v9ses)) {
277 inode->i_op = &v9fs_file_inode_operations;
279 p9_debug(P9_DEBUG_ERROR,
280 "special files without extended mode\n");
284 init_special_inode(inode, inode->i_mode, inode->i_rdev);
287 if (v9fs_proto_dotl(v9ses)) {
288 inode->i_op = &v9fs_file_inode_operations_dotl;
289 inode->i_fop = &v9fs_file_operations_dotl;
291 inode->i_op = &v9fs_file_inode_operations;
292 inode->i_fop = &v9fs_file_operations;
297 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
298 p9_debug(P9_DEBUG_ERROR,
299 "extended modes used with legacy protocol\n");
304 if (v9fs_proto_dotl(v9ses))
305 inode->i_op = &v9fs_symlink_inode_operations_dotl;
307 inode->i_op = &v9fs_symlink_inode_operations;
312 if (v9fs_proto_dotl(v9ses))
313 inode->i_op = &v9fs_dir_inode_operations_dotl;
314 else if (v9fs_proto_dotu(v9ses))
315 inode->i_op = &v9fs_dir_inode_operations_dotu;
317 inode->i_op = &v9fs_dir_inode_operations;
319 if (v9fs_proto_dotl(v9ses))
320 inode->i_fop = &v9fs_dir_operations_dotl;
322 inode->i_fop = &v9fs_dir_operations;
326 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
327 mode, mode & S_IFMT);
332 v9fs_set_netfs_context(inode);
339 * v9fs_get_inode - helper function to setup an inode
341 * @mode: mode to setup inode with
342 * @rdev: The device numbers to set
345 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
349 struct v9fs_session_info *v9ses = sb->s_fs_info;
351 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
353 inode = new_inode(sb);
355 pr_warn("%s (%d): Problem allocating inode\n",
356 __func__, task_pid_nr(current));
357 return ERR_PTR(-ENOMEM);
359 err = v9fs_init_inode(v9ses, inode, mode, rdev);
368 * v9fs_evict_inode - Remove an inode from the inode cache
369 * @inode: inode to release
372 void v9fs_evict_inode(struct inode *inode)
374 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
375 __le32 __maybe_unused version;
377 truncate_inode_pages_final(&inode->i_data);
379 #ifdef CONFIG_9P_FSCACHE
380 version = cpu_to_le32(v9inode->qid.version);
381 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
386 filemap_fdatawrite(&inode->i_data);
388 #ifdef CONFIG_9P_FSCACHE
389 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
393 static int v9fs_test_inode(struct inode *inode, void *data)
397 struct v9fs_inode *v9inode = V9FS_I(inode);
398 struct p9_wstat *st = (struct p9_wstat *)data;
399 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
401 umode = p9mode2unixmode(v9ses, st, &rdev);
402 /* don't match inode of different type */
403 if (inode_wrong_type(inode, umode))
406 /* compare qid details */
407 if (memcmp(&v9inode->qid.version,
408 &st->qid.version, sizeof(v9inode->qid.version)))
411 if (v9inode->qid.type != st->qid.type)
414 if (v9inode->qid.path != st->qid.path)
419 static int v9fs_test_new_inode(struct inode *inode, void *data)
424 static int v9fs_set_inode(struct inode *inode, void *data)
426 struct v9fs_inode *v9inode = V9FS_I(inode);
427 struct p9_wstat *st = (struct p9_wstat *)data;
429 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
433 static struct inode *v9fs_qid_iget(struct super_block *sb,
443 struct v9fs_session_info *v9ses = sb->s_fs_info;
444 int (*test)(struct inode *inode, void *data);
447 test = v9fs_test_new_inode;
449 test = v9fs_test_inode;
451 i_ino = v9fs_qid2ino(qid);
452 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
454 return ERR_PTR(-ENOMEM);
455 if (!(inode->i_state & I_NEW))
458 * initialize the inode with the stat info
459 * FIXME!! we may need support for stale inodes
462 inode->i_ino = i_ino;
463 umode = p9mode2unixmode(v9ses, st, &rdev);
464 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
468 v9fs_stat2inode(st, inode, sb, 0);
469 v9fs_cache_inode_get_cookie(inode);
470 unlock_new_inode(inode);
474 return ERR_PTR(retval);
479 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
480 struct super_block *sb, int new)
483 struct inode *inode = NULL;
485 st = p9_client_stat(fid);
489 inode = v9fs_qid_iget(sb, &st->qid, st, new);
496 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
498 * @flags: flags to convert
500 static int v9fs_at_to_dotl_flags(int flags)
504 if (flags & AT_REMOVEDIR)
505 rflags |= P9_DOTL_AT_REMOVEDIR;
511 * v9fs_dec_count - helper functon to drop i_nlink.
513 * If a directory had nlink <= 2 (including . and ..), then we should not drop
514 * the link count, which indicates the underlying exported fs doesn't maintain
515 * nlink accurately. e.g.
516 * - overlayfs sets nlink to 1 for merged dir
517 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
518 * than EXT4_LINK_MAX (65000) links.
520 * @inode: inode whose nlink is being dropped
522 static void v9fs_dec_count(struct inode *inode)
524 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
529 * v9fs_remove - helper function to remove files and directories
530 * @dir: directory inode that is being deleted
531 * @dentry: dentry that is being deleted
532 * @flags: removing a directory
536 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
539 int retval = -EOPNOTSUPP;
540 struct p9_fid *v9fid, *dfid;
541 struct v9fs_session_info *v9ses;
543 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
546 v9ses = v9fs_inode2v9ses(dir);
547 inode = d_inode(dentry);
548 dfid = v9fs_parent_fid(dentry);
550 retval = PTR_ERR(dfid);
551 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
554 if (v9fs_proto_dotl(v9ses))
555 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
556 v9fs_at_to_dotl_flags(flags));
558 if (retval == -EOPNOTSUPP) {
559 /* Try the one based on path */
560 v9fid = v9fs_fid_clone(dentry);
562 return PTR_ERR(v9fid);
563 retval = p9_client_remove(v9fid);
567 * directories on unlink should have zero
570 if (flags & AT_REMOVEDIR) {
574 v9fs_dec_count(inode);
576 v9fs_invalidate_inode_attr(inode);
577 v9fs_invalidate_inode_attr(dir);
579 /* invalidate all fids associated with dentry */
580 /* NOTE: This will not include open fids */
581 dentry->d_op->d_release(dentry);
587 * v9fs_create - Create a file
588 * @v9ses: session information
589 * @dir: directory that dentry is being created in
590 * @dentry: dentry that is being created
591 * @extension: 9p2000.u extension string to support devices, etc.
592 * @perm: create permissions
596 static struct p9_fid *
597 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
598 struct dentry *dentry, char *extension, u32 perm, u8 mode)
601 const unsigned char *name;
602 struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
605 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
608 name = dentry->d_name.name;
609 dfid = v9fs_parent_fid(dentry);
612 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
616 /* clone a fid to use for creation */
617 ofid = clone_fid(dfid);
620 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
624 err = p9_client_fcreate(ofid, name, perm, mode, extension);
626 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
630 if (!(perm & P9_DMLINK)) {
631 /* now walk from the parent so we can get unopened fid */
632 fid = p9_client_walk(dfid, 1, &name, 1);
635 p9_debug(P9_DEBUG_VFS,
636 "p9_client_walk failed %d\n", err);
640 * instantiate inode and assign the unopened fid to the dentry
642 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
644 err = PTR_ERR(inode);
645 p9_debug(P9_DEBUG_VFS,
646 "inode creation failed %d\n", err);
649 v9fs_fid_add(dentry, &fid);
650 d_instantiate(dentry, inode);
662 * v9fs_vfs_create - VFS hook to create a regular file
663 * @idmap: idmap of the mount
664 * @dir: The parent directory
665 * @dentry: The name of file to be created
666 * @mode: The UNIX file mode to set
667 * @excl: True if the file must not yet exist
669 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
675 v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir,
676 struct dentry *dentry, umode_t mode, bool excl)
678 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
679 u32 perm = unixmode2p9mode(v9ses, mode);
683 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
687 v9fs_invalidate_inode_attr(dir);
694 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
695 * @idmap: idmap of the mount
696 * @dir: inode that is being unlinked
697 * @dentry: dentry that is being unlinked
698 * @mode: mode for new directory
702 static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
703 struct dentry *dentry, umode_t mode)
708 struct v9fs_session_info *v9ses;
710 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
712 v9ses = v9fs_inode2v9ses(dir);
713 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
714 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
720 v9fs_invalidate_inode_attr(dir);
730 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
731 * @dir: inode that is being walked from
732 * @dentry: dentry that is being walked to?
733 * @flags: lookup flags (unused)
737 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
741 struct v9fs_session_info *v9ses;
742 struct p9_fid *dfid, *fid;
744 const unsigned char *name;
746 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
747 dir, dentry, dentry, flags);
749 if (dentry->d_name.len > NAME_MAX)
750 return ERR_PTR(-ENAMETOOLONG);
752 v9ses = v9fs_inode2v9ses(dir);
753 /* We can walk d_parent because we hold the dir->i_mutex */
754 dfid = v9fs_parent_fid(dentry);
756 return ERR_CAST(dfid);
759 * Make sure we don't use a wrong inode due to parallel
760 * unlink. For cached mode create calls request for new
761 * inode. But with cache disabled, lookup should do this.
763 name = dentry->d_name.name;
764 fid = p9_client_walk(dfid, 1, &name, 1);
766 if (fid == ERR_PTR(-ENOENT))
768 else if (IS_ERR(fid))
769 inode = ERR_CAST(fid);
770 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
771 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
773 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
775 * If we had a rename on the server and a parallel lookup
776 * for the new name, then make sure we instantiate with
777 * the new name. ie look up for a/b, while on server somebody
778 * moved b under k and client parallely did a lookup for
781 res = d_splice_alias(inode, dentry);
784 v9fs_fid_add(dentry, &fid);
785 else if (!IS_ERR(res))
786 v9fs_fid_add(res, &fid);
794 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
795 struct file *file, unsigned int flags, umode_t mode)
799 struct v9fs_inode __maybe_unused *v9inode;
800 struct v9fs_session_info *v9ses;
802 struct dentry *res = NULL;
806 if (d_in_lookup(dentry)) {
807 res = v9fs_vfs_lookup(dir, dentry, 0);
816 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
817 return finish_no_open(file, res);
821 v9ses = v9fs_inode2v9ses(dir);
822 perm = unixmode2p9mode(v9ses, mode);
823 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses));
825 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
826 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
827 p9_debug(P9_DEBUG_CACHE,
828 "write-only file with writeback enabled, creating w/ O_RDWR\n");
830 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode);
836 v9fs_invalidate_inode_attr(dir);
837 inode = d_inode(dentry);
838 v9inode = V9FS_I(inode);
839 err = finish_open(file, dentry, generic_file_open);
843 file->private_data = fid;
844 #ifdef CONFIG_9P_FSCACHE
845 if (v9ses->cache & CACHE_FSCACHE)
846 fscache_use_cookie(v9fs_inode_cookie(v9inode),
847 file->f_mode & FMODE_WRITE);
850 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags);
851 v9fs_open_fid_add(inode, &fid);
853 file->f_mode |= FMODE_CREATED;
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 * @idmap: The idmap of the mount
890 * @old_dir: old dir inode
891 * @old_dentry: old dentry
892 * @new_dir: new dir inode
893 * @new_dentry: new dentry
894 * @flags: RENAME_* flags
899 v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
900 struct dentry *old_dentry, struct inode *new_dir,
901 struct dentry *new_dentry, unsigned int flags)
904 struct inode *old_inode;
905 struct inode *new_inode;
906 struct v9fs_session_info *v9ses;
907 struct p9_fid *oldfid = NULL, *dfid = NULL;
908 struct p9_fid *olddirfid = NULL;
909 struct p9_fid *newdirfid = NULL;
910 struct p9_wstat wstat;
915 p9_debug(P9_DEBUG_VFS, "\n");
917 old_inode = d_inode(old_dentry);
918 new_inode = d_inode(new_dentry);
919 v9ses = v9fs_inode2v9ses(old_inode);
920 oldfid = v9fs_fid_lookup(old_dentry);
922 return PTR_ERR(oldfid);
924 dfid = v9fs_parent_fid(old_dentry);
925 olddirfid = clone_fid(dfid);
929 if (IS_ERR(olddirfid)) {
930 retval = PTR_ERR(olddirfid);
934 dfid = v9fs_parent_fid(new_dentry);
935 newdirfid = clone_fid(dfid);
939 if (IS_ERR(newdirfid)) {
940 retval = PTR_ERR(newdirfid);
944 down_write(&v9ses->rename_sem);
945 if (v9fs_proto_dotl(v9ses)) {
946 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
947 newdirfid, new_dentry->d_name.name);
948 if (retval == -EOPNOTSUPP)
949 retval = p9_client_rename(oldfid, newdirfid,
950 new_dentry->d_name.name);
951 if (retval != -EOPNOTSUPP)
954 if (old_dentry->d_parent != new_dentry->d_parent) {
956 * 9P .u can only handle file rename in the same directory
959 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
963 v9fs_blank_wstat(&wstat);
964 wstat.muid = v9ses->uname;
965 wstat.name = new_dentry->d_name.name;
966 retval = p9_client_wstat(oldfid, &wstat);
971 if (S_ISDIR(new_inode->i_mode))
972 clear_nlink(new_inode);
974 v9fs_dec_count(new_inode);
976 if (S_ISDIR(old_inode->i_mode)) {
979 v9fs_dec_count(old_dir);
981 v9fs_invalidate_inode_attr(old_inode);
982 v9fs_invalidate_inode_attr(old_dir);
983 v9fs_invalidate_inode_attr(new_dir);
985 /* successful rename */
986 d_move(old_dentry, new_dentry);
988 up_write(&v9ses->rename_sem);
991 p9_fid_put(newdirfid);
992 p9_fid_put(olddirfid);
998 * v9fs_vfs_getattr - retrieve file metadata
999 * @idmap: idmap of the mount
1000 * @path: Object to query
1001 * @stat: metadata structure to populate
1002 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1003 * @flags: AT_STATX_xxx setting
1008 v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
1009 struct kstat *stat, u32 request_mask, unsigned int flags)
1011 struct dentry *dentry = path->dentry;
1012 struct inode *inode = d_inode(dentry);
1013 struct v9fs_session_info *v9ses;
1015 struct p9_wstat *st;
1017 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1018 v9ses = v9fs_dentry2v9ses(dentry);
1019 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
1020 generic_fillattr(&nop_mnt_idmap, inode, stat);
1022 } else if (v9ses->cache & CACHE_WRITEBACK) {
1023 if (S_ISREG(inode->i_mode)) {
1024 int retval = filemap_fdatawrite(inode->i_mapping);
1027 p9_debug(P9_DEBUG_ERROR,
1028 "flushing writeback during getattr returned %d\n", retval);
1031 fid = v9fs_fid_lookup(dentry);
1033 return PTR_ERR(fid);
1035 st = p9_client_stat(fid);
1040 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1041 generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat);
1049 * v9fs_vfs_setattr - set file metadata
1050 * @idmap: idmap of the mount
1051 * @dentry: file whose metadata to set
1052 * @iattr: metadata assignment structure
1056 static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
1057 struct dentry *dentry, struct iattr *iattr)
1059 int retval, use_dentry = 0;
1060 struct inode *inode = d_inode(dentry);
1061 struct v9fs_session_info *v9ses;
1062 struct p9_fid *fid = NULL;
1063 struct p9_wstat wstat;
1065 p9_debug(P9_DEBUG_VFS, "\n");
1066 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
1071 v9ses = v9fs_dentry2v9ses(dentry);
1072 if (iattr->ia_valid & ATTR_FILE) {
1073 fid = iattr->ia_file->private_data;
1077 fid = v9fs_fid_lookup(dentry);
1081 return PTR_ERR(fid);
1083 v9fs_blank_wstat(&wstat);
1084 if (iattr->ia_valid & ATTR_MODE)
1085 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1087 if (iattr->ia_valid & ATTR_MTIME)
1088 wstat.mtime = iattr->ia_mtime.tv_sec;
1090 if (iattr->ia_valid & ATTR_ATIME)
1091 wstat.atime = iattr->ia_atime.tv_sec;
1093 if (iattr->ia_valid & ATTR_SIZE)
1094 wstat.length = iattr->ia_size;
1096 if (v9fs_proto_dotu(v9ses)) {
1097 if (iattr->ia_valid & ATTR_UID)
1098 wstat.n_uid = iattr->ia_uid;
1100 if (iattr->ia_valid & ATTR_GID)
1101 wstat.n_gid = iattr->ia_gid;
1104 /* Write all dirty data */
1105 if (d_is_reg(dentry)) {
1106 retval = filemap_fdatawrite(inode->i_mapping);
1108 p9_debug(P9_DEBUG_ERROR,
1109 "flushing writeback during setattr returned %d\n", retval);
1112 retval = p9_client_wstat(fid, &wstat);
1120 if ((iattr->ia_valid & ATTR_SIZE) &&
1121 iattr->ia_size != i_size_read(inode)) {
1122 truncate_setsize(inode, iattr->ia_size);
1123 truncate_pagecache(inode, iattr->ia_size);
1125 #ifdef CONFIG_9P_FSCACHE
1126 if (v9ses->cache & CACHE_FSCACHE) {
1127 struct v9fs_inode *v9inode = V9FS_I(inode);
1129 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
1134 v9fs_invalidate_inode_attr(inode);
1136 setattr_copy(&nop_mnt_idmap, inode, iattr);
1137 mark_inode_dirty(inode);
1142 * v9fs_stat2inode - populate an inode structure with mistat info
1143 * @stat: Plan 9 metadata (mistat) structure
1144 * @inode: inode to populate
1145 * @sb: superblock of filesystem
1146 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1151 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1152 struct super_block *sb, unsigned int flags)
1155 struct v9fs_session_info *v9ses = sb->s_fs_info;
1156 struct v9fs_inode *v9inode = V9FS_I(inode);
1158 set_nlink(inode, 1);
1160 inode->i_atime.tv_sec = stat->atime;
1161 inode->i_mtime.tv_sec = stat->mtime;
1162 inode->i_ctime.tv_sec = stat->mtime;
1164 inode->i_uid = v9ses->dfltuid;
1165 inode->i_gid = v9ses->dfltgid;
1167 if (v9fs_proto_dotu(v9ses)) {
1168 inode->i_uid = stat->n_uid;
1169 inode->i_gid = stat->n_gid;
1171 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1172 if (v9fs_proto_dotu(v9ses)) {
1173 unsigned int i_nlink;
1175 * Hadlink support got added later to the .u extension.
1176 * So there can be a server out there that doesn't
1177 * support this even with .u extension. That would
1178 * just leave us with stat->extension being an empty
1181 /* HARDLINKCOUNT %u */
1182 if (sscanf(stat->extension,
1183 " HARDLINKCOUNT %u", &i_nlink) == 1)
1184 set_nlink(inode, i_nlink);
1187 mode = p9mode2perm(v9ses, stat);
1188 mode |= inode->i_mode & ~S_IALLUGO;
1189 inode->i_mode = mode;
1191 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1192 v9fs_i_size_write(inode, stat->length);
1193 /* not real number of blocks, but 512 byte ones ... */
1194 inode->i_blocks = (stat->length + 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_vfs_get_link - follow a symlink path
1220 * @dentry: dentry for symlink
1221 * @inode: inode for symlink
1222 * @done: delayed call for when we are done with the return value
1225 static const char *v9fs_vfs_get_link(struct dentry *dentry,
1226 struct inode *inode,
1227 struct delayed_call *done)
1229 struct v9fs_session_info *v9ses;
1231 struct p9_wstat *st;
1235 return ERR_PTR(-ECHILD);
1237 v9ses = v9fs_dentry2v9ses(dentry);
1238 if (!v9fs_proto_dotu(v9ses))
1239 return ERR_PTR(-EBADF);
1241 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1242 fid = v9fs_fid_lookup(dentry);
1245 return ERR_CAST(fid);
1247 st = p9_client_stat(fid);
1250 return ERR_CAST(st);
1252 if (!(st->mode & P9_DMSYMLINK)) {
1255 return ERR_PTR(-EINVAL);
1257 res = st->extension;
1258 st->extension = NULL;
1259 if (strlen(res) >= PATH_MAX)
1260 res[PATH_MAX - 1] = '\0';
1264 set_delayed_call(done, kfree_link, res);
1269 * v9fs_vfs_mkspecial - create a special file
1270 * @dir: inode to create special file in
1271 * @dentry: dentry to create
1272 * @perm: mode to create special file
1273 * @extension: 9p2000.u format extension string representing special file
1277 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1278 u32 perm, const char *extension)
1281 struct v9fs_session_info *v9ses;
1283 v9ses = v9fs_inode2v9ses(dir);
1284 if (!v9fs_proto_dotu(v9ses)) {
1285 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1289 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1292 return PTR_ERR(fid);
1294 v9fs_invalidate_inode_attr(dir);
1300 * v9fs_vfs_symlink - helper function to create symlinks
1301 * @idmap: idmap of the mount
1302 * @dir: directory inode containing symlink
1303 * @dentry: dentry for symlink
1304 * @symname: symlink data
1306 * See Also: 9P2000.u RFC for more information
1311 v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1312 struct dentry *dentry, const char *symname)
1314 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1315 dir->i_ino, dentry, symname);
1317 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1320 #define U32_MAX_DIGITS 10
1323 * v9fs_vfs_link - create a hardlink
1324 * @old_dentry: dentry for file to link to
1325 * @dir: inode destination for new link
1326 * @dentry: dentry for link
1331 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1332 struct dentry *dentry)
1335 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1336 struct p9_fid *oldfid;
1338 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1339 dir->i_ino, dentry, old_dentry);
1341 oldfid = v9fs_fid_clone(old_dentry);
1343 return PTR_ERR(oldfid);
1345 sprintf(name, "%d\n", oldfid->fid);
1346 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1348 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1349 v9fs_invalidate_inode_attr(dir);
1356 * v9fs_vfs_mknod - create a special file
1357 * @idmap: idmap of the mount
1358 * @dir: inode destination for new link
1359 * @dentry: dentry for file
1360 * @mode: mode for creation
1361 * @rdev: device associated with special file
1366 v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
1367 struct dentry *dentry, umode_t mode, dev_t rdev)
1369 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1371 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1374 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
1375 dir->i_ino, dentry, mode,
1376 MAJOR(rdev), MINOR(rdev));
1378 /* build extension */
1380 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1381 else if (S_ISCHR(mode))
1382 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1386 perm = unixmode2p9mode(v9ses, mode);
1387 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1392 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1396 struct p9_wstat *st;
1397 struct v9fs_session_info *v9ses;
1400 v9ses = v9fs_inode2v9ses(inode);
1401 st = p9_client_stat(fid);
1405 * Don't update inode if the file type is different
1407 umode = p9mode2unixmode(v9ses, st, &rdev);
1408 if (inode_wrong_type(inode, umode))
1412 * We don't want to refresh inode->i_size,
1413 * because we may have cached data
1415 flags = (v9ses->cache & CACHE_LOOSE) ?
1416 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1417 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1424 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1425 .create = v9fs_vfs_create,
1426 .lookup = v9fs_vfs_lookup,
1427 .atomic_open = v9fs_vfs_atomic_open,
1428 .symlink = v9fs_vfs_symlink,
1429 .link = v9fs_vfs_link,
1430 .unlink = v9fs_vfs_unlink,
1431 .mkdir = v9fs_vfs_mkdir,
1432 .rmdir = v9fs_vfs_rmdir,
1433 .mknod = v9fs_vfs_mknod,
1434 .rename = v9fs_vfs_rename,
1435 .getattr = v9fs_vfs_getattr,
1436 .setattr = v9fs_vfs_setattr,
1439 static const struct inode_operations v9fs_dir_inode_operations = {
1440 .create = v9fs_vfs_create,
1441 .lookup = v9fs_vfs_lookup,
1442 .atomic_open = v9fs_vfs_atomic_open,
1443 .unlink = v9fs_vfs_unlink,
1444 .mkdir = v9fs_vfs_mkdir,
1445 .rmdir = v9fs_vfs_rmdir,
1446 .mknod = v9fs_vfs_mknod,
1447 .rename = v9fs_vfs_rename,
1448 .getattr = v9fs_vfs_getattr,
1449 .setattr = v9fs_vfs_setattr,
1452 static const struct inode_operations v9fs_file_inode_operations = {
1453 .getattr = v9fs_vfs_getattr,
1454 .setattr = v9fs_vfs_setattr,
1457 static const struct inode_operations v9fs_symlink_inode_operations = {
1458 .get_link = v9fs_vfs_get_link,
1459 .getattr = v9fs_vfs_getattr,
1460 .setattr = v9fs_vfs_setattr,