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 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
50 static const struct inode_operations v9fs_dir_inode_operations;
51 static const struct inode_operations v9fs_dir_inode_operations_dotu;
52 static const struct inode_operations v9fs_file_inode_operations;
53 static const struct inode_operations v9fs_symlink_inode_operations;
56 * unixmode2p9mode - convert unix mode bits to plan 9
57 * @v9ses: v9fs session information
58 * @mode: mode to convert
62 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
68 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)
88 if ((mode & P9_DMLINK))
96 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
97 * @v9ses: v9fs session information
98 * @mode: mode to convert
102 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
108 if ((mode & P9_DMDIR) == P9_DMDIR)
110 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
112 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
113 && (v9ses->nodev == 0))
115 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
116 && (v9ses->nodev == 0))
118 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
119 && (v9ses->nodev == 0))
124 if (v9fs_proto_dotu(v9ses)) {
125 if ((mode & P9_DMSETUID) == P9_DMSETUID)
128 if ((mode & P9_DMSETGID) == P9_DMSETGID)
131 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
139 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
140 * @uflags: flags to convert
141 * @extended: if .u extensions are active
144 int v9fs_uflags2omode(int uflags, int extended)
164 if (uflags & O_TRUNC)
171 if (uflags & O_APPEND)
179 * v9fs_blank_wstat - helper function to setup a 9P stat structure
180 * @wstat: structure to initialize
185 v9fs_blank_wstat(struct p9_wstat *wstat)
189 wstat->qid.type = ~0;
190 wstat->qid.version = ~0;
191 *((long long *)&wstat->qid.path) = ~0;
203 wstat->extension = NULL;
207 * v9fs_alloc_inode - helper function to allocate an inode
210 struct inode *v9fs_alloc_inode(struct super_block *sb)
212 struct v9fs_inode *v9inode;
213 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
217 #ifdef CONFIG_9P_FSCACHE
218 v9inode->fscache = NULL;
219 spin_lock_init(&v9inode->fscache_lock);
221 v9inode->writeback_fid = NULL;
222 v9inode->cache_validity = 0;
223 mutex_init(&v9inode->v_mutex);
224 return &v9inode->vfs_inode;
228 * v9fs_destroy_inode - destroy an inode
232 static void v9fs_i_callback(struct rcu_head *head)
234 struct inode *inode = container_of(head, struct inode, i_rcu);
235 INIT_LIST_HEAD(&inode->i_dentry);
236 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
239 void v9fs_destroy_inode(struct inode *inode)
241 call_rcu(&inode->i_rcu, v9fs_i_callback);
244 int v9fs_init_inode(struct v9fs_session_info *v9ses,
245 struct inode *inode, int mode)
249 inode_init_owner(inode, NULL, mode);
252 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
253 inode->i_mapping->a_ops = &v9fs_addr_operations;
255 switch (mode & S_IFMT) {
260 if (v9fs_proto_dotl(v9ses)) {
261 inode->i_op = &v9fs_file_inode_operations_dotl;
262 inode->i_fop = &v9fs_file_operations_dotl;
263 } else if (v9fs_proto_dotu(v9ses)) {
264 inode->i_op = &v9fs_file_inode_operations;
265 inode->i_fop = &v9fs_file_operations;
267 P9_DPRINTK(P9_DEBUG_ERROR,
268 "special files without extended mode\n");
272 init_special_inode(inode, inode->i_mode, inode->i_rdev);
275 if (v9fs_proto_dotl(v9ses)) {
276 inode->i_op = &v9fs_file_inode_operations_dotl;
279 &v9fs_cached_file_operations_dotl;
281 inode->i_fop = &v9fs_file_operations_dotl;
283 inode->i_op = &v9fs_file_inode_operations;
285 inode->i_fop = &v9fs_cached_file_operations;
287 inode->i_fop = &v9fs_file_operations;
292 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
293 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
294 "legacy protocol.\n");
299 if (v9fs_proto_dotl(v9ses))
300 inode->i_op = &v9fs_symlink_inode_operations_dotl;
302 inode->i_op = &v9fs_symlink_inode_operations;
307 if (v9fs_proto_dotl(v9ses))
308 inode->i_op = &v9fs_dir_inode_operations_dotl;
309 else if (v9fs_proto_dotu(v9ses))
310 inode->i_op = &v9fs_dir_inode_operations_dotu;
312 inode->i_op = &v9fs_dir_inode_operations;
314 if (v9fs_proto_dotl(v9ses))
315 inode->i_fop = &v9fs_dir_operations_dotl;
317 inode->i_fop = &v9fs_dir_operations;
321 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
322 mode, mode & S_IFMT);
332 * v9fs_get_inode - helper function to setup an inode
334 * @mode: mode to setup inode with
338 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
342 struct v9fs_session_info *v9ses = sb->s_fs_info;
344 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
346 inode = new_inode(sb);
348 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
349 return ERR_PTR(-ENOMEM);
351 err = v9fs_init_inode(v9ses, inode, mode);
360 static struct v9fs_fid*
361 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
365 struct v9fs_fid *ret;
366 struct v9fs_fcall *fcall;
368 nfid = v9fs_get_idpool(&v9ses->fidpool);
370 eprintk(KERN_WARNING, "no free fids available\n");
371 return ERR_PTR(-ENOSPC);
374 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
378 if (fcall && fcall->id == RWALK)
381 PRINT_FCALL_ERROR("walk error", fcall);
382 v9fs_put_idpool(nfid, &v9ses->fidpool);
388 ret = v9fs_fid_create(v9ses, nfid);
394 err = v9fs_fid_insert(ret, dentry);
396 v9fs_fid_destroy(ret);
403 v9fs_t_clunk(v9ses, nfid);
413 * v9fs_clear_inode - release an inode
414 * @inode: inode to release
417 void v9fs_evict_inode(struct inode *inode)
419 struct v9fs_inode *v9inode = V9FS_I(inode);
421 truncate_inode_pages(inode->i_mapping, 0);
422 end_writeback(inode);
423 filemap_fdatawrite(inode->i_mapping);
425 #ifdef CONFIG_9P_FSCACHE
426 v9fs_cache_inode_put_cookie(inode);
428 /* clunk the fid stashed in writeback_fid */
429 if (v9inode->writeback_fid) {
430 p9_client_clunk(v9inode->writeback_fid);
431 v9inode->writeback_fid = NULL;
435 static int v9fs_test_inode(struct inode *inode, void *data)
438 struct v9fs_inode *v9inode = V9FS_I(inode);
439 struct p9_wstat *st = (struct p9_wstat *)data;
440 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
442 umode = p9mode2unixmode(v9ses, st->mode);
443 /* don't match inode of different type */
444 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
447 /* compare qid details */
448 if (memcmp(&v9inode->qid.version,
449 &st->qid.version, sizeof(v9inode->qid.version)))
452 if (v9inode->qid.type != st->qid.type)
457 static int v9fs_test_new_inode(struct inode *inode, void *data)
462 static int v9fs_set_inode(struct inode *inode, void *data)
464 struct v9fs_inode *v9inode = V9FS_I(inode);
465 struct p9_wstat *st = (struct p9_wstat *)data;
467 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
471 static struct inode *v9fs_qid_iget(struct super_block *sb,
479 struct v9fs_session_info *v9ses = sb->s_fs_info;
480 int (*test)(struct inode *, void *);
483 test = v9fs_test_new_inode;
485 test = v9fs_test_inode;
487 i_ino = v9fs_qid2ino(qid);
488 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
490 return ERR_PTR(-ENOMEM);
491 if (!(inode->i_state & I_NEW))
494 * initialize the inode with the stat info
495 * FIXME!! we may need support for stale inodes
498 inode->i_ino = i_ino;
499 umode = p9mode2unixmode(v9ses, st->mode);
500 retval = v9fs_init_inode(v9ses, inode, umode);
504 v9fs_stat2inode(st, inode, sb);
505 #ifdef CONFIG_9P_FSCACHE
506 v9fs_cache_inode_get_cookie(inode);
508 unlock_new_inode(inode);
511 unlock_new_inode(inode);
513 return ERR_PTR(retval);
518 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
519 struct super_block *sb, int new)
522 struct inode *inode = NULL;
524 st = p9_client_stat(fid);
528 inode = v9fs_qid_iget(sb, &st->qid, st, new);
535 * v9fs_remove - helper function to remove files and directories
536 * @dir: directory inode that is being deleted
537 * @dentry: dentry that is being deleted
538 * @rmdir: removing a directory
542 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
545 int retval = -EOPNOTSUPP;
546 struct p9_fid *v9fid, *dfid;
547 struct v9fs_session_info *v9ses;
549 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
552 v9ses = v9fs_inode2v9ses(dir);
553 inode = dentry->d_inode;
554 dfid = v9fs_fid_lookup(dentry->d_parent);
556 retval = PTR_ERR(dfid);
557 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
560 if (v9fs_proto_dotl(v9ses))
561 retval = p9_client_unlinkat(dfid, dentry->d_name.name, flags);
562 if (retval == -EOPNOTSUPP) {
563 /* Try the one based on path */
564 v9fid = v9fs_fid_clone(dentry);
566 return PTR_ERR(v9fid);
567 retval = p9_client_remove(v9fid);
571 * directories on unlink should have zero
574 if (flags & AT_REMOVEDIR) {
580 v9fs_invalidate_inode_attr(inode);
581 v9fs_invalidate_inode_attr(dir);
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)
602 struct p9_fid *dfid, *ofid, *fid;
605 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
610 name = (char *) dentry->d_name.name;
611 dfid = v9fs_fid_lookup(dentry->d_parent);
614 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
618 /* clone a fid to use for creation */
619 ofid = p9_client_walk(dfid, 0, NULL, 1);
622 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
626 err = p9_client_fcreate(ofid, name, perm, mode, extension);
628 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
632 /* now walk from the parent so we can get unopened fid */
633 fid = p9_client_walk(dfid, 1, &name, 1);
636 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
641 /* 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_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
648 err = v9fs_fid_add(dentry, fid);
651 d_instantiate(dentry, inode);
655 p9_client_clunk(ofid);
658 p9_client_clunk(fid);
664 * v9fs_vfs_create - VFS hook to create files
665 * @dir: directory inode that is being created
666 * @dentry: dentry that is being deleted
667 * @mode: create permissions
668 * @nd: path information
673 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
674 struct nameidata *nd)
680 struct v9fs_inode *v9inode;
681 struct v9fs_session_info *v9ses;
682 struct p9_fid *fid, *inode_fid;
686 v9ses = v9fs_inode2v9ses(dir);
687 perm = unixmode2p9mode(v9ses, mode);
689 flags = nd->intent.open.flags;
693 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
694 v9fs_uflags2omode(flags,
695 v9fs_proto_dotu(v9ses)));
702 v9fs_invalidate_inode_attr(dir);
703 /* if we are opening a file, assign the open fid to the file */
705 v9inode = V9FS_I(dentry->d_inode);
706 mutex_lock(&v9inode->v_mutex);
707 if (v9ses->cache && !v9inode->writeback_fid &&
708 ((flags & O_ACCMODE) != O_RDONLY)) {
710 * clone a fid and add it to writeback_fid
711 * we do it during open time instead of
712 * page dirty time via write_begin/page_mkwrite
713 * because we want write after unlink usecase
716 inode_fid = v9fs_writeback_fid(dentry);
717 if (IS_ERR(inode_fid)) {
718 err = PTR_ERR(inode_fid);
719 mutex_unlock(&v9inode->v_mutex);
722 v9inode->writeback_fid = (void *) inode_fid;
724 mutex_unlock(&v9inode->v_mutex);
725 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
731 filp->private_data = fid;
732 #ifdef CONFIG_9P_FSCACHE
734 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
737 p9_client_clunk(fid);
743 p9_client_clunk(fid);
749 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
750 * @dir: inode that is being unlinked
751 * @dentry: dentry that is being unlinked
752 * @mode: mode for new directory
756 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
761 struct v9fs_session_info *v9ses;
763 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
765 v9ses = v9fs_inode2v9ses(dir);
766 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
767 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
773 v9fs_invalidate_inode_attr(dir);
777 p9_client_clunk(fid);
783 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
784 * @dir: inode that is being walked from
785 * @dentry: dentry that is being walked to?
786 * @nameidata: path data
790 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
791 struct nameidata *nameidata)
793 struct super_block *sb;
794 struct v9fs_session_info *v9ses;
795 struct p9_fid *dfid, *fid;
800 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
801 dir, dentry->d_name.name, dentry, nameidata);
803 if (dentry->d_name.len > NAME_MAX)
804 return ERR_PTR(-ENAMETOOLONG);
807 v9ses = v9fs_inode2v9ses(dir);
808 /* We can walk d_parent because we hold the dir->i_mutex */
809 dfid = v9fs_fid_lookup(dentry->d_parent);
811 return ERR_CAST(dfid);
813 name = (char *) dentry->d_name.name;
814 fid = p9_client_walk(dfid, 1, &name, 1);
816 result = PTR_ERR(fid);
817 if (result == -ENOENT) {
822 return ERR_PTR(result);
825 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
827 result = PTR_ERR(inode);
832 result = v9fs_fid_add(dentry, fid);
837 d_add(dentry, inode);
843 p9_client_clunk(fid);
845 return ERR_PTR(result);
849 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
850 * @i: inode that is being unlinked
851 * @d: dentry that is being unlinked
855 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
857 return v9fs_remove(i, d, 0);
861 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
862 * @i: inode that is being unlinked
863 * @d: dentry that is being unlinked
867 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
869 return v9fs_remove(i, d, AT_REMOVEDIR);
873 * v9fs_vfs_rename - VFS hook to rename an inode
874 * @old_dir: old dir inode
875 * @old_dentry: old dentry
876 * @new_dir: new dir inode
877 * @new_dentry: new dentry
882 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
883 struct inode *new_dir, struct dentry *new_dentry)
886 struct inode *old_inode;
887 struct inode *new_inode;
888 struct v9fs_session_info *v9ses;
889 struct p9_fid *oldfid;
890 struct p9_fid *olddirfid;
891 struct p9_fid *newdirfid;
892 struct p9_wstat wstat;
894 P9_DPRINTK(P9_DEBUG_VFS, "\n");
896 old_inode = old_dentry->d_inode;
897 new_inode = new_dentry->d_inode;
898 v9ses = v9fs_inode2v9ses(old_inode);
899 oldfid = v9fs_fid_lookup(old_dentry);
901 return PTR_ERR(oldfid);
903 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
904 if (IS_ERR(olddirfid)) {
905 retval = PTR_ERR(olddirfid);
909 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
910 if (IS_ERR(newdirfid)) {
911 retval = PTR_ERR(newdirfid);
915 down_write(&v9ses->rename_sem);
916 if (v9fs_proto_dotl(v9ses)) {
917 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
918 newdirfid, new_dentry->d_name.name);
919 if (retval == -EOPNOTSUPP)
920 retval = p9_client_rename(oldfid, newdirfid,
921 new_dentry->d_name.name);
922 if (retval != -EOPNOTSUPP)
925 if (old_dentry->d_parent != new_dentry->d_parent) {
927 * 9P .u can only handle file rename in the same directory
930 P9_DPRINTK(P9_DEBUG_ERROR,
931 "old dir and new dir are different\n");
935 v9fs_blank_wstat(&wstat);
936 wstat.muid = v9ses->uname;
937 wstat.name = (char *) new_dentry->d_name.name;
938 retval = p9_client_wstat(oldfid, &wstat);
943 if (S_ISDIR(new_inode->i_mode))
944 clear_nlink(new_inode);
946 drop_nlink(new_inode);
948 if (S_ISDIR(old_inode->i_mode)) {
953 v9fs_invalidate_inode_attr(old_inode);
954 v9fs_invalidate_inode_attr(old_dir);
955 v9fs_invalidate_inode_attr(new_dir);
957 /* successful rename */
958 d_move(old_dentry, new_dentry);
960 up_write(&v9ses->rename_sem);
961 p9_client_clunk(newdirfid);
964 p9_client_clunk(olddirfid);
971 * v9fs_vfs_getattr - retrieve file metadata
972 * @mnt: mount information
973 * @dentry: file to get attributes on
974 * @stat: metadata structure to populate
979 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
983 struct v9fs_session_info *v9ses;
987 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
989 v9ses = v9fs_dentry2v9ses(dentry);
990 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
991 generic_fillattr(dentry->d_inode, stat);
994 fid = v9fs_fid_lookup(dentry);
998 st = p9_client_stat(fid);
1002 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1003 generic_fillattr(dentry->d_inode, stat);
1011 * v9fs_vfs_setattr - set file metadata
1012 * @dentry: file whose metadata to set
1013 * @iattr: metadata assignment structure
1017 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1020 struct v9fs_session_info *v9ses;
1022 struct p9_wstat wstat;
1024 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1025 retval = inode_change_ok(dentry->d_inode, iattr);
1030 v9ses = v9fs_dentry2v9ses(dentry);
1031 fid = v9fs_fid_lookup(dentry);
1033 return PTR_ERR(fid);
1035 v9fs_blank_wstat(&wstat);
1036 if (iattr->ia_valid & ATTR_MODE)
1037 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1039 if (iattr->ia_valid & ATTR_MTIME)
1040 wstat.mtime = iattr->ia_mtime.tv_sec;
1042 if (iattr->ia_valid & ATTR_ATIME)
1043 wstat.atime = iattr->ia_atime.tv_sec;
1045 if (iattr->ia_valid & ATTR_SIZE)
1046 wstat.length = iattr->ia_size;
1048 if (v9fs_proto_dotu(v9ses)) {
1049 if (iattr->ia_valid & ATTR_UID)
1050 wstat.n_uid = iattr->ia_uid;
1052 if (iattr->ia_valid & ATTR_GID)
1053 wstat.n_gid = iattr->ia_gid;
1056 /* Write all dirty data */
1057 if (S_ISREG(dentry->d_inode->i_mode))
1058 filemap_write_and_wait(dentry->d_inode->i_mapping);
1060 retval = p9_client_wstat(fid, &wstat);
1064 if ((iattr->ia_valid & ATTR_SIZE) &&
1065 iattr->ia_size != i_size_read(dentry->d_inode))
1066 truncate_setsize(dentry->d_inode, iattr->ia_size);
1068 v9fs_invalidate_inode_attr(dentry->d_inode);
1070 setattr_copy(dentry->d_inode, iattr);
1071 mark_inode_dirty(dentry->d_inode);
1076 * v9fs_stat2inode - populate an inode structure with mistat info
1077 * @stat: Plan 9 metadata (mistat) structure
1078 * @inode: inode to populate
1079 * @sb: superblock of filesystem
1084 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1085 struct super_block *sb)
1089 unsigned int i_nlink;
1090 struct v9fs_session_info *v9ses = sb->s_fs_info;
1091 struct v9fs_inode *v9inode = V9FS_I(inode);
1095 inode->i_atime.tv_sec = stat->atime;
1096 inode->i_mtime.tv_sec = stat->mtime;
1097 inode->i_ctime.tv_sec = stat->mtime;
1099 inode->i_uid = v9ses->dfltuid;
1100 inode->i_gid = v9ses->dfltgid;
1102 if (v9fs_proto_dotu(v9ses)) {
1103 inode->i_uid = stat->n_uid;
1104 inode->i_gid = stat->n_gid;
1106 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1107 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1109 * Hadlink support got added later to
1110 * to the .u extension. So there can be
1111 * server out there that doesn't support
1112 * this even with .u extension. So check
1113 * for non NULL stat->extension
1115 strncpy(ext, stat->extension, sizeof(ext));
1116 /* HARDLINKCOUNT %u */
1117 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1118 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1119 inode->i_nlink = i_nlink;
1122 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1123 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1128 strncpy(ext, stat->extension, sizeof(ext));
1129 sscanf(ext, "%c %u %u", &type, &major, &minor);
1132 inode->i_mode &= ~S_IFBLK;
1133 inode->i_mode |= S_IFCHR;
1138 P9_DPRINTK(P9_DEBUG_ERROR,
1139 "Unknown special type %c %s\n", type,
1142 inode->i_rdev = MKDEV(major, minor);
1143 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1147 i_size_write(inode, stat->length);
1149 /* not real number of blocks, but 512 byte ones ... */
1150 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1151 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1155 * v9fs_qid2ino - convert qid into inode number
1158 * BUG: potential for inode number collisions?
1161 ino_t v9fs_qid2ino(struct p9_qid *qid)
1163 u64 path = qid->path + 2;
1166 if (sizeof(ino_t) == sizeof(path))
1167 memcpy(&i, &path, sizeof(ino_t));
1169 i = (ino_t) (path ^ (path >> 32));
1175 * v9fs_readlink - read a symlink's location (internal version)
1176 * @dentry: dentry for symlink
1177 * @buffer: buffer to load symlink location into
1178 * @buflen: length of buffer
1182 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1186 struct v9fs_session_info *v9ses;
1188 struct p9_wstat *st;
1190 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1192 v9ses = v9fs_dentry2v9ses(dentry);
1193 fid = v9fs_fid_lookup(dentry);
1195 return PTR_ERR(fid);
1197 if (!v9fs_proto_dotu(v9ses))
1200 st = p9_client_stat(fid);
1204 if (!(st->mode & P9_DMSYMLINK)) {
1209 /* copy extension buffer into buffer */
1210 strncpy(buffer, st->extension, buflen);
1212 P9_DPRINTK(P9_DEBUG_VFS,
1213 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1215 retval = strnlen(buffer, buflen);
1223 * v9fs_vfs_follow_link - follow a symlink path
1224 * @dentry: dentry for symlink
1229 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1232 char *link = __getname();
1234 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1237 link = ERR_PTR(-ENOMEM);
1239 len = v9fs_readlink(dentry, link, PATH_MAX);
1243 link = ERR_PTR(len);
1245 link[min(len, PATH_MAX-1)] = 0;
1247 nd_set_link(nd, link);
1253 * v9fs_vfs_put_link - release a symlink path
1254 * @dentry: dentry for symlink
1261 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1263 char *s = nd_get_link(nd);
1265 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1266 IS_ERR(s) ? "<error>" : s);
1272 * v9fs_vfs_mkspecial - create a special file
1273 * @dir: inode to create special file in
1274 * @dentry: dentry to create
1275 * @mode: mode to create special file
1276 * @extension: 9p2000.u format extension string representing special file
1280 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1281 int mode, const char *extension)
1285 struct v9fs_session_info *v9ses;
1287 v9ses = v9fs_inode2v9ses(dir);
1288 if (!v9fs_proto_dotu(v9ses)) {
1289 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1293 perm = unixmode2p9mode(v9ses, mode);
1294 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1297 return PTR_ERR(fid);
1299 v9fs_invalidate_inode_attr(dir);
1300 p9_client_clunk(fid);
1305 * v9fs_vfs_symlink - helper function to create symlinks
1306 * @dir: directory inode containing symlink
1307 * @dentry: dentry for symlink
1308 * @symname: symlink data
1310 * See Also: 9P2000.u RFC for more information
1315 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1317 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1318 dentry->d_name.name, symname);
1320 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1324 * v9fs_vfs_link - create a hardlink
1325 * @old_dentry: dentry for file to link to
1326 * @dir: inode destination for new link
1327 * @dentry: dentry for link
1332 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1333 struct dentry *dentry)
1337 struct p9_fid *oldfid;
1339 P9_DPRINTK(P9_DEBUG_VFS,
1340 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1341 old_dentry->d_name.name);
1343 oldfid = v9fs_fid_clone(old_dentry);
1345 return PTR_ERR(oldfid);
1348 if (unlikely(!name)) {
1353 sprintf(name, "%d\n", oldfid->fid);
1354 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1357 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1358 v9fs_invalidate_inode_attr(dir);
1361 p9_client_clunk(oldfid);
1366 * v9fs_vfs_mknod - create a special file
1367 * @dir: inode destination for new link
1368 * @dentry: dentry for file
1369 * @mode: mode for creation
1370 * @rdev: device associated with special file
1375 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1380 P9_DPRINTK(P9_DEBUG_VFS,
1381 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1382 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1384 if (!new_valid_dev(rdev))
1390 /* build extension */
1392 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1393 else if (S_ISCHR(mode))
1394 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1395 else if (S_ISFIFO(mode))
1397 else if (S_ISSOCK(mode))
1404 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1410 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1413 struct p9_wstat *st;
1414 struct v9fs_session_info *v9ses;
1416 v9ses = v9fs_inode2v9ses(inode);
1417 st = p9_client_stat(fid);
1421 spin_lock(&inode->i_lock);
1423 * We don't want to refresh inode->i_size,
1424 * because we may have cached data
1426 i_size = inode->i_size;
1427 v9fs_stat2inode(st, inode, inode->i_sb);
1429 inode->i_size = i_size;
1430 spin_unlock(&inode->i_lock);
1436 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1437 .create = v9fs_vfs_create,
1438 .lookup = v9fs_vfs_lookup,
1439 .symlink = v9fs_vfs_symlink,
1440 .link = v9fs_vfs_link,
1441 .unlink = v9fs_vfs_unlink,
1442 .mkdir = v9fs_vfs_mkdir,
1443 .rmdir = v9fs_vfs_rmdir,
1444 .mknod = v9fs_vfs_mknod,
1445 .rename = v9fs_vfs_rename,
1446 .getattr = v9fs_vfs_getattr,
1447 .setattr = v9fs_vfs_setattr,
1450 static const struct inode_operations v9fs_dir_inode_operations = {
1451 .create = v9fs_vfs_create,
1452 .lookup = v9fs_vfs_lookup,
1453 .unlink = v9fs_vfs_unlink,
1454 .mkdir = v9fs_vfs_mkdir,
1455 .rmdir = v9fs_vfs_rmdir,
1456 .mknod = v9fs_vfs_mknod,
1457 .rename = v9fs_vfs_rename,
1458 .getattr = v9fs_vfs_getattr,
1459 .setattr = v9fs_vfs_setattr,
1462 static const struct inode_operations v9fs_file_inode_operations = {
1463 .getattr = v9fs_vfs_getattr,
1464 .setattr = v9fs_vfs_setattr,
1467 static const struct inode_operations v9fs_symlink_inode_operations = {
1468 .readlink = generic_readlink,
1469 .follow_link = v9fs_vfs_follow_link,
1470 .put_link = v9fs_vfs_put_link,
1471 .getattr = v9fs_vfs_getattr,
1472 .setattr = v9fs_vfs_setattr,