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 * @file: dentry that is being deleted
538 * @rmdir: removing a directory
542 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
545 struct p9_fid *v9fid;
546 struct inode *file_inode;
548 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
551 file_inode = file->d_inode;
552 v9fid = v9fs_fid_clone(file);
554 return PTR_ERR(v9fid);
556 retval = p9_client_remove(v9fid);
559 * directories on unlink should have zero
563 clear_nlink(file_inode);
566 drop_nlink(file_inode);
568 v9fs_invalidate_inode_attr(file_inode);
569 v9fs_invalidate_inode_attr(dir);
575 * v9fs_create - Create a file
576 * @v9ses: session information
577 * @dir: directory that dentry is being created in
578 * @dentry: dentry that is being created
579 * @extension: 9p2000.u extension string to support devices, etc.
580 * @perm: create permissions
584 static struct p9_fid *
585 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
586 struct dentry *dentry, char *extension, u32 perm, u8 mode)
590 struct p9_fid *dfid, *ofid, *fid;
593 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
598 name = (char *) dentry->d_name.name;
599 dfid = v9fs_fid_lookup(dentry->d_parent);
602 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
606 /* clone a fid to use for creation */
607 ofid = p9_client_walk(dfid, 0, NULL, 1);
610 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
614 err = p9_client_fcreate(ofid, name, perm, mode, extension);
616 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
620 /* now walk from the parent so we can get unopened fid */
621 fid = p9_client_walk(dfid, 1, &name, 1);
624 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
629 /* instantiate inode and assign the unopened fid to the dentry */
630 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
632 err = PTR_ERR(inode);
633 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
636 d_instantiate(dentry, inode);
637 err = v9fs_fid_add(dentry, fid);
645 p9_client_clunk(ofid);
648 p9_client_clunk(fid);
654 * v9fs_vfs_create - VFS hook to create files
655 * @dir: directory inode that is being created
656 * @dentry: dentry that is being deleted
657 * @mode: create permissions
658 * @nd: path information
663 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
664 struct nameidata *nd)
670 struct v9fs_inode *v9inode;
671 struct v9fs_session_info *v9ses;
672 struct p9_fid *fid, *inode_fid;
676 v9ses = v9fs_inode2v9ses(dir);
677 perm = unixmode2p9mode(v9ses, mode);
679 flags = nd->intent.open.flags;
683 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
684 v9fs_uflags2omode(flags,
685 v9fs_proto_dotu(v9ses)));
692 v9fs_invalidate_inode_attr(dir);
693 /* if we are opening a file, assign the open fid to the file */
695 v9inode = V9FS_I(dentry->d_inode);
696 mutex_lock(&v9inode->v_mutex);
697 if (v9ses->cache && !v9inode->writeback_fid &&
698 ((flags & O_ACCMODE) != O_RDONLY)) {
700 * clone a fid and add it to writeback_fid
701 * we do it during open time instead of
702 * page dirty time via write_begin/page_mkwrite
703 * because we want write after unlink usecase
706 inode_fid = v9fs_writeback_fid(dentry);
707 if (IS_ERR(inode_fid)) {
708 err = PTR_ERR(inode_fid);
709 mutex_unlock(&v9inode->v_mutex);
712 v9inode->writeback_fid = (void *) inode_fid;
714 mutex_unlock(&v9inode->v_mutex);
715 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
721 filp->private_data = fid;
722 #ifdef CONFIG_9P_FSCACHE
724 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
727 p9_client_clunk(fid);
733 p9_client_clunk(fid);
739 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
740 * @dir: inode that is being unlinked
741 * @dentry: dentry that is being unlinked
742 * @mode: mode for new directory
746 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
751 struct v9fs_session_info *v9ses;
753 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
755 v9ses = v9fs_inode2v9ses(dir);
756 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
757 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
763 v9fs_invalidate_inode_attr(dir);
767 p9_client_clunk(fid);
773 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
774 * @dir: inode that is being walked from
775 * @dentry: dentry that is being walked to?
776 * @nameidata: path data
780 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
781 struct nameidata *nameidata)
783 struct super_block *sb;
784 struct v9fs_session_info *v9ses;
785 struct p9_fid *dfid, *fid;
790 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
791 dir, dentry->d_name.name, dentry, nameidata);
793 if (dentry->d_name.len > NAME_MAX)
794 return ERR_PTR(-ENAMETOOLONG);
797 v9ses = v9fs_inode2v9ses(dir);
798 /* We can walk d_parent because we hold the dir->i_mutex */
799 dfid = v9fs_fid_lookup(dentry->d_parent);
801 return ERR_CAST(dfid);
803 name = (char *) dentry->d_name.name;
804 fid = p9_client_walk(dfid, 1, &name, 1);
806 result = PTR_ERR(fid);
807 if (result == -ENOENT) {
812 return ERR_PTR(result);
815 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
817 result = PTR_ERR(inode);
822 result = v9fs_fid_add(dentry, fid);
827 d_add(dentry, inode);
833 p9_client_clunk(fid);
835 return ERR_PTR(result);
839 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
840 * @i: inode that is being unlinked
841 * @d: dentry that is being unlinked
845 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
847 return v9fs_remove(i, d, 0);
851 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
852 * @i: inode that is being unlinked
853 * @d: dentry that is being unlinked
857 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
859 return v9fs_remove(i, d, 1);
863 * v9fs_vfs_rename - VFS hook to rename an inode
864 * @old_dir: old dir inode
865 * @old_dentry: old dentry
866 * @new_dir: new dir inode
867 * @new_dentry: new dentry
872 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
873 struct inode *new_dir, struct dentry *new_dentry)
876 struct inode *old_inode;
877 struct inode *new_inode;
878 struct v9fs_session_info *v9ses;
879 struct p9_fid *oldfid;
880 struct p9_fid *olddirfid;
881 struct p9_fid *newdirfid;
882 struct p9_wstat wstat;
884 P9_DPRINTK(P9_DEBUG_VFS, "\n");
886 old_inode = old_dentry->d_inode;
887 new_inode = new_dentry->d_inode;
888 v9ses = v9fs_inode2v9ses(old_inode);
889 oldfid = v9fs_fid_lookup(old_dentry);
891 return PTR_ERR(oldfid);
893 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
894 if (IS_ERR(olddirfid)) {
895 retval = PTR_ERR(olddirfid);
899 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
900 if (IS_ERR(newdirfid)) {
901 retval = PTR_ERR(newdirfid);
905 down_write(&v9ses->rename_sem);
906 if (v9fs_proto_dotl(v9ses)) {
907 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
908 newdirfid, new_dentry->d_name.name);
909 if (retval == -EOPNOTSUPP)
910 retval = p9_client_rename(oldfid, newdirfid,
911 new_dentry->d_name.name);
912 if (retval != -EOPNOTSUPP)
915 if (old_dentry->d_parent != new_dentry->d_parent) {
917 * 9P .u can only handle file rename in the same directory
920 P9_DPRINTK(P9_DEBUG_ERROR,
921 "old dir and new dir are different\n");
925 v9fs_blank_wstat(&wstat);
926 wstat.muid = v9ses->uname;
927 wstat.name = (char *) new_dentry->d_name.name;
928 retval = p9_client_wstat(oldfid, &wstat);
933 if (S_ISDIR(new_inode->i_mode))
934 clear_nlink(new_inode);
936 drop_nlink(new_inode);
938 if (S_ISDIR(old_inode->i_mode)) {
943 v9fs_invalidate_inode_attr(old_inode);
944 v9fs_invalidate_inode_attr(old_dir);
945 v9fs_invalidate_inode_attr(new_dir);
947 /* successful rename */
948 d_move(old_dentry, new_dentry);
950 up_write(&v9ses->rename_sem);
951 p9_client_clunk(newdirfid);
954 p9_client_clunk(olddirfid);
961 * v9fs_vfs_getattr - retrieve file metadata
962 * @mnt: mount information
963 * @dentry: file to get attributes on
964 * @stat: metadata structure to populate
969 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
973 struct v9fs_session_info *v9ses;
977 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
979 v9ses = v9fs_dentry2v9ses(dentry);
980 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
981 generic_fillattr(dentry->d_inode, stat);
984 fid = v9fs_fid_lookup(dentry);
988 st = p9_client_stat(fid);
992 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
993 generic_fillattr(dentry->d_inode, stat);
1001 * v9fs_vfs_setattr - set file metadata
1002 * @dentry: file whose metadata to set
1003 * @iattr: metadata assignment structure
1007 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1010 struct v9fs_session_info *v9ses;
1012 struct p9_wstat wstat;
1014 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1015 retval = inode_change_ok(dentry->d_inode, iattr);
1020 v9ses = v9fs_dentry2v9ses(dentry);
1021 fid = v9fs_fid_lookup(dentry);
1023 return PTR_ERR(fid);
1025 v9fs_blank_wstat(&wstat);
1026 if (iattr->ia_valid & ATTR_MODE)
1027 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1029 if (iattr->ia_valid & ATTR_MTIME)
1030 wstat.mtime = iattr->ia_mtime.tv_sec;
1032 if (iattr->ia_valid & ATTR_ATIME)
1033 wstat.atime = iattr->ia_atime.tv_sec;
1035 if (iattr->ia_valid & ATTR_SIZE)
1036 wstat.length = iattr->ia_size;
1038 if (v9fs_proto_dotu(v9ses)) {
1039 if (iattr->ia_valid & ATTR_UID)
1040 wstat.n_uid = iattr->ia_uid;
1042 if (iattr->ia_valid & ATTR_GID)
1043 wstat.n_gid = iattr->ia_gid;
1046 /* Write all dirty data */
1047 if (S_ISREG(dentry->d_inode->i_mode))
1048 filemap_write_and_wait(dentry->d_inode->i_mapping);
1050 retval = p9_client_wstat(fid, &wstat);
1054 if ((iattr->ia_valid & ATTR_SIZE) &&
1055 iattr->ia_size != i_size_read(dentry->d_inode))
1056 truncate_setsize(dentry->d_inode, iattr->ia_size);
1058 v9fs_invalidate_inode_attr(dentry->d_inode);
1060 setattr_copy(dentry->d_inode, iattr);
1061 mark_inode_dirty(dentry->d_inode);
1066 * v9fs_stat2inode - populate an inode structure with mistat info
1067 * @stat: Plan 9 metadata (mistat) structure
1068 * @inode: inode to populate
1069 * @sb: superblock of filesystem
1074 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1075 struct super_block *sb)
1079 unsigned int i_nlink;
1080 struct v9fs_session_info *v9ses = sb->s_fs_info;
1081 struct v9fs_inode *v9inode = V9FS_I(inode);
1085 inode->i_atime.tv_sec = stat->atime;
1086 inode->i_mtime.tv_sec = stat->mtime;
1087 inode->i_ctime.tv_sec = stat->mtime;
1089 inode->i_uid = v9ses->dfltuid;
1090 inode->i_gid = v9ses->dfltgid;
1092 if (v9fs_proto_dotu(v9ses)) {
1093 inode->i_uid = stat->n_uid;
1094 inode->i_gid = stat->n_gid;
1096 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1097 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1099 * Hadlink support got added later to
1100 * to the .u extension. So there can be
1101 * server out there that doesn't support
1102 * this even with .u extension. So check
1103 * for non NULL stat->extension
1105 strncpy(ext, stat->extension, sizeof(ext));
1106 /* HARDLINKCOUNT %u */
1107 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1108 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1109 inode->i_nlink = i_nlink;
1112 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1113 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1118 strncpy(ext, stat->extension, sizeof(ext));
1119 sscanf(ext, "%c %u %u", &type, &major, &minor);
1122 inode->i_mode &= ~S_IFBLK;
1123 inode->i_mode |= S_IFCHR;
1128 P9_DPRINTK(P9_DEBUG_ERROR,
1129 "Unknown special type %c %s\n", type,
1132 inode->i_rdev = MKDEV(major, minor);
1133 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1137 i_size_write(inode, stat->length);
1139 /* not real number of blocks, but 512 byte ones ... */
1140 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1141 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1145 * v9fs_qid2ino - convert qid into inode number
1148 * BUG: potential for inode number collisions?
1151 ino_t v9fs_qid2ino(struct p9_qid *qid)
1153 u64 path = qid->path + 2;
1156 if (sizeof(ino_t) == sizeof(path))
1157 memcpy(&i, &path, sizeof(ino_t));
1159 i = (ino_t) (path ^ (path >> 32));
1165 * v9fs_readlink - read a symlink's location (internal version)
1166 * @dentry: dentry for symlink
1167 * @buffer: buffer to load symlink location into
1168 * @buflen: length of buffer
1172 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1176 struct v9fs_session_info *v9ses;
1178 struct p9_wstat *st;
1180 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1182 v9ses = v9fs_dentry2v9ses(dentry);
1183 fid = v9fs_fid_lookup(dentry);
1185 return PTR_ERR(fid);
1187 if (!v9fs_proto_dotu(v9ses))
1190 st = p9_client_stat(fid);
1194 if (!(st->mode & P9_DMSYMLINK)) {
1199 /* copy extension buffer into buffer */
1200 strncpy(buffer, st->extension, buflen);
1202 P9_DPRINTK(P9_DEBUG_VFS,
1203 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1205 retval = strnlen(buffer, buflen);
1213 * v9fs_vfs_follow_link - follow a symlink path
1214 * @dentry: dentry for symlink
1219 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1222 char *link = __getname();
1224 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1227 link = ERR_PTR(-ENOMEM);
1229 len = v9fs_readlink(dentry, link, PATH_MAX);
1233 link = ERR_PTR(len);
1235 link[min(len, PATH_MAX-1)] = 0;
1237 nd_set_link(nd, link);
1243 * v9fs_vfs_put_link - release a symlink path
1244 * @dentry: dentry for symlink
1251 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1253 char *s = nd_get_link(nd);
1255 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1256 IS_ERR(s) ? "<error>" : s);
1262 * v9fs_vfs_mkspecial - create a special file
1263 * @dir: inode to create special file in
1264 * @dentry: dentry to create
1265 * @mode: mode to create special file
1266 * @extension: 9p2000.u format extension string representing special file
1270 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1271 int mode, const char *extension)
1275 struct v9fs_session_info *v9ses;
1277 v9ses = v9fs_inode2v9ses(dir);
1278 if (!v9fs_proto_dotu(v9ses)) {
1279 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1283 perm = unixmode2p9mode(v9ses, mode);
1284 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1287 return PTR_ERR(fid);
1289 v9fs_invalidate_inode_attr(dir);
1290 p9_client_clunk(fid);
1295 * v9fs_vfs_symlink - helper function to create symlinks
1296 * @dir: directory inode containing symlink
1297 * @dentry: dentry for symlink
1298 * @symname: symlink data
1300 * See Also: 9P2000.u RFC for more information
1305 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1307 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1308 dentry->d_name.name, symname);
1310 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1314 * v9fs_vfs_link - create a hardlink
1315 * @old_dentry: dentry for file to link to
1316 * @dir: inode destination for new link
1317 * @dentry: dentry for link
1322 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1323 struct dentry *dentry)
1327 struct p9_fid *oldfid;
1329 P9_DPRINTK(P9_DEBUG_VFS,
1330 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1331 old_dentry->d_name.name);
1333 oldfid = v9fs_fid_clone(old_dentry);
1335 return PTR_ERR(oldfid);
1338 if (unlikely(!name)) {
1343 sprintf(name, "%d\n", oldfid->fid);
1344 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1347 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1348 v9fs_invalidate_inode_attr(dir);
1351 p9_client_clunk(oldfid);
1356 * v9fs_vfs_mknod - create a special file
1357 * @dir: inode destination for new link
1358 * @dentry: dentry for file
1359 * @mode: mode for creation
1360 * @rdev: device associated with special file
1365 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1370 P9_DPRINTK(P9_DEBUG_VFS,
1371 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1372 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1374 if (!new_valid_dev(rdev))
1380 /* build extension */
1382 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1383 else if (S_ISCHR(mode))
1384 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1385 else if (S_ISFIFO(mode))
1387 else if (S_ISSOCK(mode))
1394 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1400 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1403 struct p9_wstat *st;
1404 struct v9fs_session_info *v9ses;
1406 v9ses = v9fs_inode2v9ses(inode);
1407 st = p9_client_stat(fid);
1411 spin_lock(&inode->i_lock);
1413 * We don't want to refresh inode->i_size,
1414 * because we may have cached data
1416 i_size = inode->i_size;
1417 v9fs_stat2inode(st, inode, inode->i_sb);
1419 inode->i_size = i_size;
1420 spin_unlock(&inode->i_lock);
1426 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1427 .create = v9fs_vfs_create,
1428 .lookup = v9fs_vfs_lookup,
1429 .symlink = v9fs_vfs_symlink,
1430 .link = v9fs_vfs_link,
1431 .unlink = v9fs_vfs_unlink,
1432 .mkdir = v9fs_vfs_mkdir,
1433 .rmdir = v9fs_vfs_rmdir,
1434 .mknod = v9fs_vfs_mknod,
1435 .rename = v9fs_vfs_rename,
1436 .getattr = v9fs_vfs_getattr,
1437 .setattr = v9fs_vfs_setattr,
1440 static const struct inode_operations v9fs_dir_inode_operations = {
1441 .create = v9fs_vfs_create,
1442 .lookup = v9fs_vfs_lookup,
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 .readlink = generic_readlink,
1459 .follow_link = v9fs_vfs_follow_link,
1460 .put_link = v9fs_vfs_put_link,
1461 .getattr = v9fs_vfs_getattr,
1462 .setattr = v9fs_vfs_setattr,