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 & 0777; /* S_IRWXUGO */
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)
180 if (uflags & O_TRUNC)
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
226 struct inode *v9fs_alloc_inode(struct super_block *sb)
228 struct v9fs_inode *v9inode;
229 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL);
232 #ifdef CONFIG_9P_FSCACHE
233 v9inode->fscache = NULL;
234 mutex_init(&v9inode->fscache_lock);
236 v9inode->writeback_fid = NULL;
237 v9inode->cache_validity = 0;
238 mutex_init(&v9inode->v_mutex);
239 return &v9inode->vfs_inode;
243 * v9fs_free_inode - destroy an inode
247 void v9fs_free_inode(struct inode *inode)
249 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
252 int v9fs_init_inode(struct v9fs_session_info *v9ses,
253 struct inode *inode, umode_t mode, dev_t rdev)
257 inode_init_owner(inode, NULL, mode);
259 inode->i_rdev = rdev;
260 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
261 inode->i_mapping->a_ops = &v9fs_addr_operations;
263 switch (mode & S_IFMT) {
268 if (v9fs_proto_dotl(v9ses)) {
269 inode->i_op = &v9fs_file_inode_operations_dotl;
270 } else if (v9fs_proto_dotu(v9ses)) {
271 inode->i_op = &v9fs_file_inode_operations;
273 p9_debug(P9_DEBUG_ERROR,
274 "special files without extended mode\n");
278 init_special_inode(inode, inode->i_mode, inode->i_rdev);
281 if (v9fs_proto_dotl(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations_dotl;
283 if (v9ses->cache == CACHE_LOOSE ||
284 v9ses->cache == CACHE_FSCACHE)
286 &v9fs_cached_file_operations_dotl;
287 else if (v9ses->cache == CACHE_MMAP)
288 inode->i_fop = &v9fs_mmap_file_operations_dotl;
290 inode->i_fop = &v9fs_file_operations_dotl;
292 inode->i_op = &v9fs_file_inode_operations;
293 if (v9ses->cache == CACHE_LOOSE ||
294 v9ses->cache == CACHE_FSCACHE)
296 &v9fs_cached_file_operations;
297 else if (v9ses->cache == CACHE_MMAP)
298 inode->i_fop = &v9fs_mmap_file_operations;
300 inode->i_fop = &v9fs_file_operations;
305 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
306 p9_debug(P9_DEBUG_ERROR,
307 "extended modes used with legacy protocol\n");
312 if (v9fs_proto_dotl(v9ses))
313 inode->i_op = &v9fs_symlink_inode_operations_dotl;
315 inode->i_op = &v9fs_symlink_inode_operations;
320 if (v9fs_proto_dotl(v9ses))
321 inode->i_op = &v9fs_dir_inode_operations_dotl;
322 else if (v9fs_proto_dotu(v9ses))
323 inode->i_op = &v9fs_dir_inode_operations_dotu;
325 inode->i_op = &v9fs_dir_inode_operations;
327 if (v9fs_proto_dotl(v9ses))
328 inode->i_fop = &v9fs_dir_operations_dotl;
330 inode->i_fop = &v9fs_dir_operations;
334 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
335 mode, mode & S_IFMT);
345 * v9fs_get_inode - helper function to setup an inode
347 * @mode: mode to setup inode with
351 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
355 struct v9fs_session_info *v9ses = sb->s_fs_info;
357 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
359 inode = new_inode(sb);
361 pr_warn("%s (%d): Problem allocating inode\n",
362 __func__, task_pid_nr(current));
363 return ERR_PTR(-ENOMEM);
365 err = v9fs_init_inode(v9ses, inode, mode, rdev);
374 * v9fs_clear_inode - release an inode
375 * @inode: inode to release
378 void v9fs_evict_inode(struct inode *inode)
380 struct v9fs_inode *v9inode = V9FS_I(inode);
382 truncate_inode_pages_final(&inode->i_data);
384 filemap_fdatawrite(&inode->i_data);
386 v9fs_cache_inode_put_cookie(inode);
387 /* clunk the fid stashed in writeback_fid */
388 if (v9inode->writeback_fid) {
389 p9_client_clunk(v9inode->writeback_fid);
390 v9inode->writeback_fid = NULL;
394 static int v9fs_test_inode(struct inode *inode, void *data)
398 struct v9fs_inode *v9inode = V9FS_I(inode);
399 struct p9_wstat *st = (struct p9_wstat *)data;
400 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
402 umode = p9mode2unixmode(v9ses, st, &rdev);
403 /* don't match inode of different type */
404 if (inode_wrong_type(inode, umode))
407 /* compare qid details */
408 if (memcmp(&v9inode->qid.version,
409 &st->qid.version, sizeof(v9inode->qid.version)))
412 if (v9inode->qid.type != st->qid.type)
415 if (v9inode->qid.path != st->qid.path)
420 static int v9fs_test_new_inode(struct inode *inode, void *data)
425 static int v9fs_set_inode(struct inode *inode, void *data)
427 struct v9fs_inode *v9inode = V9FS_I(inode);
428 struct p9_wstat *st = (struct p9_wstat *)data;
430 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
434 static struct inode *v9fs_qid_iget(struct super_block *sb,
444 struct v9fs_session_info *v9ses = sb->s_fs_info;
445 int (*test)(struct inode *, void *);
448 test = v9fs_test_new_inode;
450 test = v9fs_test_inode;
452 i_ino = v9fs_qid2ino(qid);
453 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
455 return ERR_PTR(-ENOMEM);
456 if (!(inode->i_state & I_NEW))
459 * initialize the inode with the stat info
460 * FIXME!! we may need support for stale inodes
463 inode->i_ino = i_ino;
464 umode = p9mode2unixmode(v9ses, st, &rdev);
465 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
469 v9fs_stat2inode(st, inode, sb, 0);
470 v9fs_cache_inode_get_cookie(inode);
471 unlock_new_inode(inode);
475 return ERR_PTR(retval);
480 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
481 struct super_block *sb, int new)
484 struct inode *inode = NULL;
486 st = p9_client_stat(fid);
490 inode = v9fs_qid_iget(sb, &st->qid, st, new);
497 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
499 * @flags: flags to convert
501 static int v9fs_at_to_dotl_flags(int flags)
504 if (flags & AT_REMOVEDIR)
505 rflags |= P9_DOTL_AT_REMOVEDIR;
510 * v9fs_dec_count - helper functon to drop i_nlink.
512 * If a directory had nlink <= 2 (including . and ..), then we should not drop
513 * the link count, which indicates the underlying exported fs doesn't maintain
514 * nlink accurately. e.g.
515 * - overlayfs sets nlink to 1 for merged dir
516 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
517 * than EXT4_LINK_MAX (65000) links.
519 * @inode: inode whose nlink is being dropped
521 static void v9fs_dec_count(struct inode *inode)
523 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
528 * v9fs_remove - helper function to remove files and directories
529 * @dir: directory inode that is being deleted
530 * @dentry: dentry that is being deleted
531 * @flags: removing a directory
535 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
538 int retval = -EOPNOTSUPP;
539 struct p9_fid *v9fid, *dfid;
540 struct v9fs_session_info *v9ses;
542 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
545 v9ses = v9fs_inode2v9ses(dir);
546 inode = d_inode(dentry);
547 dfid = v9fs_parent_fid(dentry);
549 retval = PTR_ERR(dfid);
550 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
553 if (v9fs_proto_dotl(v9ses))
554 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
555 v9fs_at_to_dotl_flags(flags));
556 if (retval == -EOPNOTSUPP) {
557 /* Try the one based on path */
558 v9fid = v9fs_fid_clone(dentry);
560 return PTR_ERR(v9fid);
561 retval = p9_client_remove(v9fid);
565 * directories on unlink should have zero
568 if (flags & AT_REMOVEDIR) {
572 v9fs_dec_count(inode);
574 v9fs_invalidate_inode_attr(inode);
575 v9fs_invalidate_inode_attr(dir);
581 * v9fs_create - Create a file
582 * @v9ses: session information
583 * @dir: directory that dentry is being created in
584 * @dentry: dentry that is being created
585 * @extension: 9p2000.u extension string to support devices, etc.
586 * @perm: create permissions
590 static struct p9_fid *
591 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
592 struct dentry *dentry, char *extension, u32 perm, u8 mode)
595 const unsigned char *name;
596 struct p9_fid *dfid, *ofid, *fid;
599 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
604 name = dentry->d_name.name;
605 dfid = v9fs_parent_fid(dentry);
608 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
612 /* clone a fid to use for creation */
613 ofid = clone_fid(dfid);
616 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
620 err = p9_client_fcreate(ofid, name, perm, mode, extension);
622 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
626 if (!(perm & P9_DMLINK)) {
627 /* now walk from the parent so we can get unopened fid */
628 fid = p9_client_walk(dfid, 1, &name, 1);
631 p9_debug(P9_DEBUG_VFS,
632 "p9_client_walk failed %d\n", err);
637 * instantiate inode and assign the unopened fid to the dentry
639 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
641 err = PTR_ERR(inode);
642 p9_debug(P9_DEBUG_VFS,
643 "inode creation failed %d\n", err);
646 v9fs_fid_add(dentry, fid);
647 d_instantiate(dentry, inode);
652 p9_client_clunk(ofid);
655 p9_client_clunk(fid);
661 * v9fs_vfs_create - VFS hook to create a regular file
663 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
666 * @dir: directory inode that is being created
667 * @dentry: dentry that is being deleted
668 * @mode: create permissions
673 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
676 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
677 u32 perm = unixmode2p9mode(v9ses, mode);
681 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
685 v9fs_invalidate_inode_attr(dir);
686 p9_client_clunk(fid);
692 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
693 * @dir: inode that is being unlinked
694 * @dentry: dentry that is being unlinked
695 * @mode: mode for new directory
699 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
704 struct v9fs_session_info *v9ses;
706 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
708 v9ses = v9fs_inode2v9ses(dir);
709 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
710 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
716 v9fs_invalidate_inode_attr(dir);
720 p9_client_clunk(fid);
726 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
727 * @dir: inode that is being walked from
728 * @dentry: dentry that is being walked to?
729 * @flags: lookup flags (unused)
733 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
737 struct v9fs_session_info *v9ses;
738 struct p9_fid *dfid, *fid;
740 const unsigned char *name;
742 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
743 dir, dentry, dentry, flags);
745 if (dentry->d_name.len > NAME_MAX)
746 return ERR_PTR(-ENAMETOOLONG);
748 v9ses = v9fs_inode2v9ses(dir);
749 /* We can walk d_parent because we hold the dir->i_mutex */
750 dfid = v9fs_parent_fid(dentry);
752 return ERR_CAST(dfid);
755 * Make sure we don't use a wrong inode due to parallel
756 * unlink. For cached mode create calls request for new
757 * inode. But with cache disabled, lookup should do this.
759 name = dentry->d_name.name;
760 fid = p9_client_walk(dfid, 1, &name, 1);
761 if (fid == ERR_PTR(-ENOENT))
763 else if (IS_ERR(fid))
764 inode = ERR_CAST(fid);
765 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
766 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
768 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
770 * If we had a rename on the server and a parallel lookup
771 * for the new name, then make sure we instantiate with
772 * the new name. ie look up for a/b, while on server somebody
773 * moved b under k and client parallely did a lookup for
776 res = d_splice_alias(inode, dentry);
779 v9fs_fid_add(dentry, fid);
780 else if (!IS_ERR(res))
781 v9fs_fid_add(res, fid);
783 p9_client_clunk(fid);
789 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
790 struct file *file, unsigned flags, umode_t mode)
794 struct v9fs_inode *v9inode;
795 struct v9fs_session_info *v9ses;
796 struct p9_fid *fid, *inode_fid;
797 struct dentry *res = NULL;
799 if (d_in_lookup(dentry)) {
800 res = v9fs_vfs_lookup(dir, dentry, 0);
809 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
810 return finish_no_open(file, res);
814 v9ses = v9fs_inode2v9ses(dir);
815 perm = unixmode2p9mode(v9ses, mode);
816 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
817 v9fs_uflags2omode(flags,
818 v9fs_proto_dotu(v9ses)));
825 v9fs_invalidate_inode_attr(dir);
826 v9inode = V9FS_I(d_inode(dentry));
827 mutex_lock(&v9inode->v_mutex);
828 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
829 !v9inode->writeback_fid &&
830 ((flags & O_ACCMODE) != O_RDONLY)) {
832 * clone a fid and add it to writeback_fid
833 * we do it during open time instead of
834 * page dirty time via write_begin/page_mkwrite
835 * because we want write after unlink usecase
838 inode_fid = v9fs_writeback_fid(dentry);
839 if (IS_ERR(inode_fid)) {
840 err = PTR_ERR(inode_fid);
841 mutex_unlock(&v9inode->v_mutex);
844 v9inode->writeback_fid = (void *) inode_fid;
846 mutex_unlock(&v9inode->v_mutex);
847 err = finish_open(file, dentry, generic_file_open);
851 file->private_data = fid;
852 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
853 v9fs_cache_inode_set_cookie(d_inode(dentry), file);
855 file->f_mode |= FMODE_CREATED;
862 p9_client_clunk(fid);
867 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
868 * @i: inode that is being unlinked
869 * @d: dentry that is being unlinked
873 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
875 return v9fs_remove(i, d, 0);
879 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
880 * @i: inode that is being unlinked
881 * @d: dentry that is being unlinked
885 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
887 return v9fs_remove(i, d, AT_REMOVEDIR);
891 * v9fs_vfs_rename - VFS hook to rename an inode
892 * @old_dir: old dir inode
893 * @old_dentry: old dentry
894 * @new_dir: new dir inode
895 * @new_dentry: new dentry
900 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
901 struct inode *new_dir, struct dentry *new_dentry,
905 struct inode *old_inode;
906 struct inode *new_inode;
907 struct v9fs_session_info *v9ses;
908 struct p9_fid *oldfid;
909 struct p9_fid *olddirfid;
910 struct p9_fid *newdirfid;
911 struct p9_wstat wstat;
916 p9_debug(P9_DEBUG_VFS, "\n");
918 old_inode = d_inode(old_dentry);
919 new_inode = d_inode(new_dentry);
920 v9ses = v9fs_inode2v9ses(old_inode);
921 oldfid = v9fs_fid_lookup(old_dentry);
923 return PTR_ERR(oldfid);
925 olddirfid = clone_fid(v9fs_parent_fid(old_dentry));
926 if (IS_ERR(olddirfid)) {
927 retval = PTR_ERR(olddirfid);
931 newdirfid = clone_fid(v9fs_parent_fid(new_dentry));
932 if (IS_ERR(newdirfid)) {
933 retval = PTR_ERR(newdirfid);
937 down_write(&v9ses->rename_sem);
938 if (v9fs_proto_dotl(v9ses)) {
939 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
940 newdirfid, new_dentry->d_name.name);
941 if (retval == -EOPNOTSUPP)
942 retval = p9_client_rename(oldfid, newdirfid,
943 new_dentry->d_name.name);
944 if (retval != -EOPNOTSUPP)
947 if (old_dentry->d_parent != new_dentry->d_parent) {
949 * 9P .u can only handle file rename in the same directory
952 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
956 v9fs_blank_wstat(&wstat);
957 wstat.muid = v9ses->uname;
958 wstat.name = new_dentry->d_name.name;
959 retval = p9_client_wstat(oldfid, &wstat);
964 if (S_ISDIR(new_inode->i_mode))
965 clear_nlink(new_inode);
967 v9fs_dec_count(new_inode);
969 if (S_ISDIR(old_inode->i_mode)) {
972 v9fs_dec_count(old_dir);
974 v9fs_invalidate_inode_attr(old_inode);
975 v9fs_invalidate_inode_attr(old_dir);
976 v9fs_invalidate_inode_attr(new_dir);
978 /* successful rename */
979 d_move(old_dentry, new_dentry);
981 up_write(&v9ses->rename_sem);
982 p9_client_clunk(newdirfid);
985 p9_client_clunk(olddirfid);
992 * v9fs_vfs_getattr - retrieve file metadata
993 * @path: Object to query
994 * @stat: metadata structure to populate
995 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
996 * @flags: AT_STATX_xxx setting
1001 v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
1002 u32 request_mask, unsigned int flags)
1004 struct dentry *dentry = path->dentry;
1005 struct v9fs_session_info *v9ses;
1007 struct p9_wstat *st;
1009 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1010 v9ses = v9fs_dentry2v9ses(dentry);
1011 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1012 generic_fillattr(d_inode(dentry), stat);
1015 fid = v9fs_fid_lookup(dentry);
1017 return PTR_ERR(fid);
1019 st = p9_client_stat(fid);
1023 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
1024 generic_fillattr(d_inode(dentry), stat);
1032 * v9fs_vfs_setattr - set file metadata
1033 * @dentry: file whose metadata to set
1034 * @iattr: metadata assignment structure
1038 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1041 struct v9fs_session_info *v9ses;
1042 struct p9_fid *fid = NULL;
1043 struct p9_wstat wstat;
1045 p9_debug(P9_DEBUG_VFS, "\n");
1046 retval = setattr_prepare(dentry, iattr);
1051 v9ses = v9fs_dentry2v9ses(dentry);
1052 if (iattr->ia_valid & ATTR_FILE) {
1053 fid = iattr->ia_file->private_data;
1057 fid = v9fs_fid_lookup(dentry);
1059 return PTR_ERR(fid);
1061 v9fs_blank_wstat(&wstat);
1062 if (iattr->ia_valid & ATTR_MODE)
1063 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1065 if (iattr->ia_valid & ATTR_MTIME)
1066 wstat.mtime = iattr->ia_mtime.tv_sec;
1068 if (iattr->ia_valid & ATTR_ATIME)
1069 wstat.atime = iattr->ia_atime.tv_sec;
1071 if (iattr->ia_valid & ATTR_SIZE)
1072 wstat.length = iattr->ia_size;
1074 if (v9fs_proto_dotu(v9ses)) {
1075 if (iattr->ia_valid & ATTR_UID)
1076 wstat.n_uid = iattr->ia_uid;
1078 if (iattr->ia_valid & ATTR_GID)
1079 wstat.n_gid = iattr->ia_gid;
1082 /* Write all dirty data */
1083 if (d_is_reg(dentry))
1084 filemap_write_and_wait(d_inode(dentry)->i_mapping);
1086 retval = p9_client_wstat(fid, &wstat);
1090 if ((iattr->ia_valid & ATTR_SIZE) &&
1091 iattr->ia_size != i_size_read(d_inode(dentry)))
1092 truncate_setsize(d_inode(dentry), iattr->ia_size);
1094 v9fs_invalidate_inode_attr(d_inode(dentry));
1096 setattr_copy(d_inode(dentry), iattr);
1097 mark_inode_dirty(d_inode(dentry));
1102 * v9fs_stat2inode - populate an inode structure with mistat info
1103 * @stat: Plan 9 metadata (mistat) structure
1104 * @inode: inode to populate
1105 * @sb: superblock of filesystem
1106 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
1111 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1112 struct super_block *sb, unsigned int flags)
1117 unsigned int i_nlink;
1118 struct v9fs_session_info *v9ses = sb->s_fs_info;
1119 struct v9fs_inode *v9inode = V9FS_I(inode);
1121 set_nlink(inode, 1);
1123 inode->i_atime.tv_sec = stat->atime;
1124 inode->i_mtime.tv_sec = stat->mtime;
1125 inode->i_ctime.tv_sec = stat->mtime;
1127 inode->i_uid = v9ses->dfltuid;
1128 inode->i_gid = v9ses->dfltgid;
1130 if (v9fs_proto_dotu(v9ses)) {
1131 inode->i_uid = stat->n_uid;
1132 inode->i_gid = stat->n_gid;
1134 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1135 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1137 * Hadlink support got added later to
1138 * to the .u extension. So there can be
1139 * server out there that doesn't support
1140 * this even with .u extension. So check
1141 * for non NULL stat->extension
1143 strlcpy(ext, stat->extension, sizeof(ext));
1144 /* HARDLINKCOUNT %u */
1145 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1146 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1147 set_nlink(inode, i_nlink);
1150 mode = p9mode2perm(v9ses, stat);
1151 mode |= inode->i_mode & ~S_IALLUGO;
1152 inode->i_mode = mode;
1154 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
1155 v9fs_i_size_write(inode, stat->length);
1156 /* not real number of blocks, but 512 byte ones ... */
1157 inode->i_blocks = (stat->length + 512 - 1) >> 9;
1158 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1162 * v9fs_qid2ino - convert qid into inode number
1165 * BUG: potential for inode number collisions?
1168 ino_t v9fs_qid2ino(struct p9_qid *qid)
1170 u64 path = qid->path + 2;
1173 if (sizeof(ino_t) == sizeof(path))
1174 memcpy(&i, &path, sizeof(ino_t));
1176 i = (ino_t) (path ^ (path >> 32));
1182 * v9fs_vfs_get_link - follow a symlink path
1183 * @dentry: dentry for symlink
1184 * @inode: inode for symlink
1185 * @done: delayed call for when we are done with the return value
1188 static const char *v9fs_vfs_get_link(struct dentry *dentry,
1189 struct inode *inode,
1190 struct delayed_call *done)
1192 struct v9fs_session_info *v9ses;
1194 struct p9_wstat *st;
1198 return ERR_PTR(-ECHILD);
1200 v9ses = v9fs_dentry2v9ses(dentry);
1201 fid = v9fs_fid_lookup(dentry);
1202 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
1205 return ERR_CAST(fid);
1207 if (!v9fs_proto_dotu(v9ses))
1208 return ERR_PTR(-EBADF);
1210 st = p9_client_stat(fid);
1212 return ERR_CAST(st);
1214 if (!(st->mode & P9_DMSYMLINK)) {
1217 return ERR_PTR(-EINVAL);
1219 res = st->extension;
1220 st->extension = NULL;
1221 if (strlen(res) >= PATH_MAX)
1222 res[PATH_MAX - 1] = '\0';
1226 set_delayed_call(done, kfree_link, res);
1231 * v9fs_vfs_mkspecial - create a special file
1232 * @dir: inode to create special file in
1233 * @dentry: dentry to create
1234 * @perm: mode to create special file
1235 * @extension: 9p2000.u format extension string representing special file
1239 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1240 u32 perm, const char *extension)
1243 struct v9fs_session_info *v9ses;
1245 v9ses = v9fs_inode2v9ses(dir);
1246 if (!v9fs_proto_dotu(v9ses)) {
1247 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1251 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1254 return PTR_ERR(fid);
1256 v9fs_invalidate_inode_attr(dir);
1257 p9_client_clunk(fid);
1262 * v9fs_vfs_symlink - helper function to create symlinks
1263 * @dir: directory inode containing symlink
1264 * @dentry: dentry for symlink
1265 * @symname: symlink data
1267 * See Also: 9P2000.u RFC for more information
1272 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1274 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
1275 dir->i_ino, dentry, symname);
1277 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1280 #define U32_MAX_DIGITS 10
1283 * v9fs_vfs_link - create a hardlink
1284 * @old_dentry: dentry for file to link to
1285 * @dir: inode destination for new link
1286 * @dentry: dentry for link
1291 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1292 struct dentry *dentry)
1295 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
1296 struct p9_fid *oldfid;
1298 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
1299 dir->i_ino, dentry, old_dentry);
1301 oldfid = v9fs_fid_clone(old_dentry);
1303 return PTR_ERR(oldfid);
1305 sprintf(name, "%d\n", oldfid->fid);
1306 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1308 v9fs_refresh_inode(oldfid, d_inode(old_dentry));
1309 v9fs_invalidate_inode_attr(dir);
1311 p9_client_clunk(oldfid);
1316 * v9fs_vfs_mknod - create a special file
1317 * @dir: inode destination for new link
1318 * @dentry: dentry for file
1319 * @mode: mode for creation
1320 * @rdev: device associated with special file
1325 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1327 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1329 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
1332 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
1333 dir->i_ino, dentry, mode,
1334 MAJOR(rdev), MINOR(rdev));
1336 /* build extension */
1338 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1339 else if (S_ISCHR(mode))
1340 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1344 perm = unixmode2p9mode(v9ses, mode);
1345 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1350 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1354 struct p9_wstat *st;
1355 struct v9fs_session_info *v9ses;
1358 v9ses = v9fs_inode2v9ses(inode);
1359 st = p9_client_stat(fid);
1363 * Don't update inode if the file type is different
1365 umode = p9mode2unixmode(v9ses, st, &rdev);
1366 if (inode_wrong_type(inode, umode))
1370 * We don't want to refresh inode->i_size,
1371 * because we may have cached data
1373 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
1374 V9FS_STAT2INODE_KEEP_ISIZE : 0;
1375 v9fs_stat2inode(st, inode, inode->i_sb, flags);
1382 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1383 .create = v9fs_vfs_create,
1384 .lookup = v9fs_vfs_lookup,
1385 .atomic_open = v9fs_vfs_atomic_open,
1386 .symlink = v9fs_vfs_symlink,
1387 .link = v9fs_vfs_link,
1388 .unlink = v9fs_vfs_unlink,
1389 .mkdir = v9fs_vfs_mkdir,
1390 .rmdir = v9fs_vfs_rmdir,
1391 .mknod = v9fs_vfs_mknod,
1392 .rename = v9fs_vfs_rename,
1393 .getattr = v9fs_vfs_getattr,
1394 .setattr = v9fs_vfs_setattr,
1397 static const struct inode_operations v9fs_dir_inode_operations = {
1398 .create = v9fs_vfs_create,
1399 .lookup = v9fs_vfs_lookup,
1400 .atomic_open = v9fs_vfs_atomic_open,
1401 .unlink = v9fs_vfs_unlink,
1402 .mkdir = v9fs_vfs_mkdir,
1403 .rmdir = v9fs_vfs_rmdir,
1404 .mknod = v9fs_vfs_mknod,
1405 .rename = v9fs_vfs_rename,
1406 .getattr = v9fs_vfs_getattr,
1407 .setattr = v9fs_vfs_setattr,
1410 static const struct inode_operations v9fs_file_inode_operations = {
1411 .getattr = v9fs_vfs_getattr,
1412 .setattr = v9fs_vfs_setattr,
1415 static const struct inode_operations v9fs_symlink_inode_operations = {
1416 .get_link = v9fs_vfs_get_link,
1417 .getattr = v9fs_vfs_getattr,
1418 .setattr = v9fs_vfs_setattr,