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 v9inode->fscache_key = NULL;
220 spin_lock_init(&v9inode->fscache_lock);
222 v9inode->writeback_fid = NULL;
223 v9inode->cache_validity = 0;
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 struct inode *v9fs_qid_iget(struct super_block *sb,
442 struct v9fs_session_info *v9ses = sb->s_fs_info;
444 i_ino = v9fs_qid2ino(qid);
445 inode = iget_locked(sb, i_ino);
447 return ERR_PTR(-ENOMEM);
448 if (!(inode->i_state & I_NEW))
451 * initialize the inode with the stat info
452 * FIXME!! we may need support for stale inodes
455 umode = p9mode2unixmode(v9ses, st->mode);
456 retval = v9fs_init_inode(v9ses, inode, umode);
460 v9fs_stat2inode(st, inode, sb);
461 #ifdef CONFIG_9P_FSCACHE
462 v9fs_fscache_set_key(inode, &st->qid);
463 v9fs_cache_inode_get_cookie(inode);
465 unlock_new_inode(inode);
468 unlock_new_inode(inode);
470 return ERR_PTR(retval);
475 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
476 struct super_block *sb)
479 struct inode *inode = NULL;
481 st = p9_client_stat(fid);
485 inode = v9fs_qid_iget(sb, &st->qid, st);
492 * v9fs_remove - helper function to remove files and directories
493 * @dir: directory inode that is being deleted
494 * @file: dentry that is being deleted
495 * @rmdir: removing a directory
499 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
502 struct p9_fid *v9fid;
503 struct inode *file_inode;
505 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
508 file_inode = file->d_inode;
509 v9fid = v9fs_fid_clone(file);
511 return PTR_ERR(v9fid);
513 retval = p9_client_remove(v9fid);
516 * directories on unlink should have zero
520 clear_nlink(file_inode);
523 drop_nlink(file_inode);
525 v9fs_invalidate_inode_attr(file_inode);
526 v9fs_invalidate_inode_attr(dir);
532 * v9fs_create - Create a file
533 * @v9ses: session information
534 * @dir: directory that dentry is being created in
535 * @dentry: dentry that is being created
536 * @extension: 9p2000.u extension string to support devices, etc.
537 * @perm: create permissions
541 static struct p9_fid *
542 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
543 struct dentry *dentry, char *extension, u32 perm, u8 mode)
547 struct p9_fid *dfid, *ofid, *fid;
550 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
555 name = (char *) dentry->d_name.name;
556 dfid = v9fs_fid_lookup(dentry->d_parent);
559 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
563 /* clone a fid to use for creation */
564 ofid = p9_client_walk(dfid, 0, NULL, 1);
567 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
571 err = p9_client_fcreate(ofid, name, perm, mode, extension);
573 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
577 /* now walk from the parent so we can get unopened fid */
578 fid = p9_client_walk(dfid, 1, &name, 1);
581 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
586 /* instantiate inode and assign the unopened fid to the dentry */
587 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
589 err = PTR_ERR(inode);
590 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
593 d_instantiate(dentry, inode);
594 err = v9fs_fid_add(dentry, fid);
602 p9_client_clunk(ofid);
605 p9_client_clunk(fid);
611 * v9fs_vfs_create - VFS hook to create files
612 * @dir: directory inode that is being created
613 * @dentry: dentry that is being deleted
614 * @mode: create permissions
615 * @nd: path information
620 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
621 struct nameidata *nd)
627 struct v9fs_inode *v9inode;
628 struct v9fs_session_info *v9ses;
629 struct p9_fid *fid, *inode_fid;
633 v9ses = v9fs_inode2v9ses(dir);
634 perm = unixmode2p9mode(v9ses, mode);
635 if (nd && nd->flags & LOOKUP_OPEN)
636 flags = nd->intent.open.flags - 1;
640 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
641 v9fs_uflags2omode(flags,
642 v9fs_proto_dotu(v9ses)));
649 v9fs_invalidate_inode_attr(dir);
650 /* if we are opening a file, assign the open fid to the file */
651 if (nd && nd->flags & LOOKUP_OPEN) {
652 v9inode = V9FS_I(dentry->d_inode);
653 if (v9ses->cache && !v9inode->writeback_fid) {
655 * clone a fid and add it to writeback_fid
656 * we do it during open time instead of
657 * page dirty time via write_begin/page_mkwrite
658 * because we want write after unlink usecase
661 inode_fid = v9fs_writeback_fid(dentry);
662 if (IS_ERR(inode_fid)) {
663 err = PTR_ERR(inode_fid);
666 v9inode->writeback_fid = (void *) inode_fid;
668 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
674 filp->private_data = fid;
675 #ifdef CONFIG_9P_FSCACHE
677 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
680 p9_client_clunk(fid);
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, int mode)
704 struct v9fs_session_info *v9ses;
706 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
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 * @nameidata: path data
733 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
734 struct nameidata *nameidata)
736 struct super_block *sb;
737 struct v9fs_session_info *v9ses;
738 struct p9_fid *dfid, *fid;
743 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
744 dir, dentry->d_name.name, dentry, nameidata);
746 if (dentry->d_name.len > NAME_MAX)
747 return ERR_PTR(-ENAMETOOLONG);
750 v9ses = v9fs_inode2v9ses(dir);
751 /* We can walk d_parent because we hold the dir->i_mutex */
752 dfid = v9fs_fid_lookup(dentry->d_parent);
754 return ERR_CAST(dfid);
756 name = (char *) dentry->d_name.name;
757 fid = p9_client_walk(dfid, 1, &name, 1);
759 result = PTR_ERR(fid);
760 if (result == -ENOENT) {
765 return ERR_PTR(result);
768 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
770 result = PTR_ERR(inode);
775 result = v9fs_fid_add(dentry, fid);
780 d_add(dentry, inode);
786 p9_client_clunk(fid);
788 return ERR_PTR(result);
792 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
793 * @i: inode that is being unlinked
794 * @d: dentry that is being unlinked
798 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
800 return v9fs_remove(i, d, 0);
804 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
805 * @i: inode that is being unlinked
806 * @d: dentry that is being unlinked
810 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
812 return v9fs_remove(i, d, 1);
816 * v9fs_vfs_rename - VFS hook to rename an inode
817 * @old_dir: old dir inode
818 * @old_dentry: old dentry
819 * @new_dir: new dir inode
820 * @new_dentry: new dentry
825 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
826 struct inode *new_dir, struct dentry *new_dentry)
829 struct inode *old_inode;
830 struct inode *new_inode;
831 struct v9fs_session_info *v9ses;
832 struct p9_fid *oldfid;
833 struct p9_fid *olddirfid;
834 struct p9_fid *newdirfid;
835 struct p9_wstat wstat;
837 P9_DPRINTK(P9_DEBUG_VFS, "\n");
839 old_inode = old_dentry->d_inode;
840 new_inode = new_dentry->d_inode;
841 v9ses = v9fs_inode2v9ses(old_inode);
842 oldfid = v9fs_fid_lookup(old_dentry);
844 return PTR_ERR(oldfid);
846 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
847 if (IS_ERR(olddirfid)) {
848 retval = PTR_ERR(olddirfid);
852 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
853 if (IS_ERR(newdirfid)) {
854 retval = PTR_ERR(newdirfid);
858 down_write(&v9ses->rename_sem);
859 if (v9fs_proto_dotl(v9ses)) {
860 retval = p9_client_rename(oldfid, newdirfid,
861 (char *) new_dentry->d_name.name);
862 if (retval != -ENOSYS)
865 if (old_dentry->d_parent != new_dentry->d_parent) {
867 * 9P .u can only handle file rename in the same directory
870 P9_DPRINTK(P9_DEBUG_ERROR,
871 "old dir and new dir are different\n");
875 v9fs_blank_wstat(&wstat);
876 wstat.muid = v9ses->uname;
877 wstat.name = (char *) new_dentry->d_name.name;
878 retval = p9_client_wstat(oldfid, &wstat);
883 if (S_ISDIR(new_inode->i_mode))
884 clear_nlink(new_inode);
886 drop_nlink(new_inode);
888 * Work around vfs rename rehash bug with
889 * FS_RENAME_DOES_D_MOVE
891 v9fs_invalidate_inode_attr(new_inode);
893 if (S_ISDIR(old_inode->i_mode)) {
898 v9fs_invalidate_inode_attr(old_inode);
899 v9fs_invalidate_inode_attr(old_dir);
900 v9fs_invalidate_inode_attr(new_dir);
902 /* successful rename */
903 d_move(old_dentry, new_dentry);
905 up_write(&v9ses->rename_sem);
906 p9_client_clunk(newdirfid);
909 p9_client_clunk(olddirfid);
916 * v9fs_vfs_getattr - retrieve file metadata
917 * @mnt: mount information
918 * @dentry: file to get attributes on
919 * @stat: metadata structure to populate
924 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
928 struct v9fs_session_info *v9ses;
932 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
934 v9ses = v9fs_inode2v9ses(dentry->d_inode);
935 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
936 generic_fillattr(dentry->d_inode, stat);
939 fid = v9fs_fid_lookup(dentry);
943 st = p9_client_stat(fid);
947 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
948 generic_fillattr(dentry->d_inode, stat);
956 * v9fs_vfs_setattr - set file metadata
957 * @dentry: file whose metadata to set
958 * @iattr: metadata assignment structure
962 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
965 struct v9fs_session_info *v9ses;
967 struct p9_wstat wstat;
969 P9_DPRINTK(P9_DEBUG_VFS, "\n");
971 v9ses = v9fs_inode2v9ses(dentry->d_inode);
972 fid = v9fs_fid_lookup(dentry);
976 v9fs_blank_wstat(&wstat);
977 if (iattr->ia_valid & ATTR_MODE)
978 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
980 if (iattr->ia_valid & ATTR_MTIME)
981 wstat.mtime = iattr->ia_mtime.tv_sec;
983 if (iattr->ia_valid & ATTR_ATIME)
984 wstat.atime = iattr->ia_atime.tv_sec;
986 if (iattr->ia_valid & ATTR_SIZE)
987 wstat.length = iattr->ia_size;
989 if (v9fs_proto_dotu(v9ses)) {
990 if (iattr->ia_valid & ATTR_UID)
991 wstat.n_uid = iattr->ia_uid;
993 if (iattr->ia_valid & ATTR_GID)
994 wstat.n_gid = iattr->ia_gid;
997 retval = p9_client_wstat(fid, &wstat);
1001 v9fs_invalidate_inode_attr(dentry->d_inode);
1002 if ((iattr->ia_valid & ATTR_SIZE) &&
1003 iattr->ia_size != i_size_read(dentry->d_inode)) {
1004 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1009 setattr_copy(dentry->d_inode, iattr);
1010 mark_inode_dirty(dentry->d_inode);
1015 * v9fs_stat2inode - populate an inode structure with mistat info
1016 * @stat: Plan 9 metadata (mistat) structure
1017 * @inode: inode to populate
1018 * @sb: superblock of filesystem
1023 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1024 struct super_block *sb)
1028 unsigned int i_nlink;
1029 struct v9fs_session_info *v9ses = sb->s_fs_info;
1030 struct v9fs_inode *v9inode = V9FS_I(inode);
1034 inode->i_atime.tv_sec = stat->atime;
1035 inode->i_mtime.tv_sec = stat->mtime;
1036 inode->i_ctime.tv_sec = stat->mtime;
1038 inode->i_uid = v9ses->dfltuid;
1039 inode->i_gid = v9ses->dfltgid;
1041 if (v9fs_proto_dotu(v9ses)) {
1042 inode->i_uid = stat->n_uid;
1043 inode->i_gid = stat->n_gid;
1045 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1046 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1048 * Hadlink support got added later to
1049 * to the .u extension. So there can be
1050 * server out there that doesn't support
1051 * this even with .u extension. So check
1052 * for non NULL stat->extension
1054 strncpy(ext, stat->extension, sizeof(ext));
1055 /* HARDLINKCOUNT %u */
1056 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1057 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1058 inode->i_nlink = i_nlink;
1061 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1062 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1067 strncpy(ext, stat->extension, sizeof(ext));
1068 sscanf(ext, "%c %u %u", &type, &major, &minor);
1071 inode->i_mode &= ~S_IFBLK;
1072 inode->i_mode |= S_IFCHR;
1077 P9_DPRINTK(P9_DEBUG_ERROR,
1078 "Unknown special type %c %s\n", type,
1081 inode->i_rdev = MKDEV(major, minor);
1082 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1086 i_size_write(inode, stat->length);
1088 /* not real number of blocks, but 512 byte ones ... */
1089 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1090 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1094 * v9fs_qid2ino - convert qid into inode number
1097 * BUG: potential for inode number collisions?
1100 ino_t v9fs_qid2ino(struct p9_qid *qid)
1102 u64 path = qid->path + 2;
1105 if (sizeof(ino_t) == sizeof(path))
1106 memcpy(&i, &path, sizeof(ino_t));
1108 i = (ino_t) (path ^ (path >> 32));
1114 * v9fs_readlink - read a symlink's location (internal version)
1115 * @dentry: dentry for symlink
1116 * @buffer: buffer to load symlink location into
1117 * @buflen: length of buffer
1121 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1125 struct v9fs_session_info *v9ses;
1127 struct p9_wstat *st;
1129 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1131 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1132 fid = v9fs_fid_lookup(dentry);
1134 return PTR_ERR(fid);
1136 if (!v9fs_proto_dotu(v9ses))
1139 st = p9_client_stat(fid);
1143 if (!(st->mode & P9_DMSYMLINK)) {
1148 /* copy extension buffer into buffer */
1149 strncpy(buffer, st->extension, buflen);
1151 P9_DPRINTK(P9_DEBUG_VFS,
1152 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1154 retval = strnlen(buffer, buflen);
1162 * v9fs_vfs_follow_link - follow a symlink path
1163 * @dentry: dentry for symlink
1168 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1171 char *link = __getname();
1173 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1176 link = ERR_PTR(-ENOMEM);
1178 len = v9fs_readlink(dentry, link, PATH_MAX);
1182 link = ERR_PTR(len);
1184 link[min(len, PATH_MAX-1)] = 0;
1186 nd_set_link(nd, link);
1192 * v9fs_vfs_put_link - release a symlink path
1193 * @dentry: dentry for symlink
1200 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1202 char *s = nd_get_link(nd);
1204 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1205 IS_ERR(s) ? "<error>" : s);
1211 * v9fs_vfs_mkspecial - create a special file
1212 * @dir: inode to create special file in
1213 * @dentry: dentry to create
1214 * @mode: mode to create special file
1215 * @extension: 9p2000.u format extension string representing special file
1219 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1220 int mode, const char *extension)
1224 struct v9fs_session_info *v9ses;
1226 v9ses = v9fs_inode2v9ses(dir);
1227 if (!v9fs_proto_dotu(v9ses)) {
1228 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1232 perm = unixmode2p9mode(v9ses, mode);
1233 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1236 return PTR_ERR(fid);
1238 v9fs_invalidate_inode_attr(dir);
1239 p9_client_clunk(fid);
1244 * v9fs_vfs_symlink - helper function to create symlinks
1245 * @dir: directory inode containing symlink
1246 * @dentry: dentry for symlink
1247 * @symname: symlink data
1249 * See Also: 9P2000.u RFC for more information
1254 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1256 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1257 dentry->d_name.name, symname);
1259 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1263 * v9fs_vfs_link - create a hardlink
1264 * @old_dentry: dentry for file to link to
1265 * @dir: inode destination for new link
1266 * @dentry: dentry for link
1271 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1272 struct dentry *dentry)
1276 struct p9_fid *oldfid;
1278 P9_DPRINTK(P9_DEBUG_VFS,
1279 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1280 old_dentry->d_name.name);
1282 oldfid = v9fs_fid_clone(old_dentry);
1284 return PTR_ERR(oldfid);
1287 if (unlikely(!name)) {
1292 sprintf(name, "%d\n", oldfid->fid);
1293 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1296 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1297 v9fs_invalidate_inode_attr(dir);
1300 p9_client_clunk(oldfid);
1305 * v9fs_vfs_mknod - create a special file
1306 * @dir: inode destination for new link
1307 * @dentry: dentry for file
1308 * @mode: mode for creation
1309 * @rdev: device associated with special file
1314 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1319 P9_DPRINTK(P9_DEBUG_VFS,
1320 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1321 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1323 if (!new_valid_dev(rdev))
1329 /* build extension */
1331 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1332 else if (S_ISCHR(mode))
1333 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1334 else if (S_ISFIFO(mode))
1336 else if (S_ISSOCK(mode))
1343 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1349 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1352 struct p9_wstat *st;
1353 struct v9fs_session_info *v9ses;
1355 v9ses = v9fs_inode2v9ses(inode);
1356 st = p9_client_stat(fid);
1360 spin_lock(&inode->i_lock);
1362 * We don't want to refresh inode->i_size,
1363 * because we may have cached data
1365 i_size = inode->i_size;
1366 v9fs_stat2inode(st, inode, inode->i_sb);
1368 inode->i_size = i_size;
1369 spin_unlock(&inode->i_lock);
1375 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1376 .create = v9fs_vfs_create,
1377 .lookup = v9fs_vfs_lookup,
1378 .symlink = v9fs_vfs_symlink,
1379 .link = v9fs_vfs_link,
1380 .unlink = v9fs_vfs_unlink,
1381 .mkdir = v9fs_vfs_mkdir,
1382 .rmdir = v9fs_vfs_rmdir,
1383 .mknod = v9fs_vfs_mknod,
1384 .rename = v9fs_vfs_rename,
1385 .getattr = v9fs_vfs_getattr,
1386 .setattr = v9fs_vfs_setattr,
1389 static const struct inode_operations v9fs_dir_inode_operations = {
1390 .create = v9fs_vfs_create,
1391 .lookup = v9fs_vfs_lookup,
1392 .unlink = v9fs_vfs_unlink,
1393 .mkdir = v9fs_vfs_mkdir,
1394 .rmdir = v9fs_vfs_rmdir,
1395 .mknod = v9fs_vfs_mknod,
1396 .rename = v9fs_vfs_rename,
1397 .getattr = v9fs_vfs_getattr,
1398 .setattr = v9fs_vfs_setattr,
1401 static const struct inode_operations v9fs_file_inode_operations = {
1402 .getattr = v9fs_vfs_getattr,
1403 .setattr = v9fs_vfs_setattr,
1406 static const struct inode_operations v9fs_symlink_inode_operations = {
1407 .readlink = generic_readlink,
1408 .follow_link = v9fs_vfs_follow_link,
1409 .put_link = v9fs_vfs_put_link,
1410 .getattr = v9fs_vfs_getattr,
1411 .setattr = v9fs_vfs_setattr,