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_set_inode(struct inode *inode, void *data)
459 struct v9fs_inode *v9inode = V9FS_I(inode);
460 struct p9_wstat *st = (struct p9_wstat *)data;
462 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
466 static struct inode *v9fs_qid_iget(struct super_block *sb,
473 struct v9fs_session_info *v9ses = sb->s_fs_info;
475 i_ino = v9fs_qid2ino(qid);
476 inode = iget5_locked(sb, i_ino, v9fs_test_inode, v9fs_set_inode, st);
478 return ERR_PTR(-ENOMEM);
479 if (!(inode->i_state & I_NEW))
482 * initialize the inode with the stat info
483 * FIXME!! we may need support for stale inodes
486 inode->i_ino = i_ino;
487 umode = p9mode2unixmode(v9ses, st->mode);
488 retval = v9fs_init_inode(v9ses, inode, umode);
492 v9fs_stat2inode(st, inode, sb);
493 #ifdef CONFIG_9P_FSCACHE
494 v9fs_cache_inode_get_cookie(inode);
496 unlock_new_inode(inode);
499 unlock_new_inode(inode);
501 return ERR_PTR(retval);
506 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
507 struct super_block *sb)
510 struct inode *inode = NULL;
512 st = p9_client_stat(fid);
516 inode = v9fs_qid_iget(sb, &st->qid, st);
523 * v9fs_remove - helper function to remove files and directories
524 * @dir: directory inode that is being deleted
525 * @file: dentry that is being deleted
526 * @rmdir: removing a directory
530 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
533 struct p9_fid *v9fid;
534 struct inode *file_inode;
536 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
539 file_inode = file->d_inode;
540 v9fid = v9fs_fid_clone(file);
542 return PTR_ERR(v9fid);
544 retval = p9_client_remove(v9fid);
547 * directories on unlink should have zero
551 clear_nlink(file_inode);
554 drop_nlink(file_inode);
556 v9fs_invalidate_inode_attr(file_inode);
557 v9fs_invalidate_inode_attr(dir);
563 * v9fs_create - Create a file
564 * @v9ses: session information
565 * @dir: directory that dentry is being created in
566 * @dentry: dentry that is being created
567 * @extension: 9p2000.u extension string to support devices, etc.
568 * @perm: create permissions
572 static struct p9_fid *
573 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
574 struct dentry *dentry, char *extension, u32 perm, u8 mode)
578 struct p9_fid *dfid, *ofid, *fid;
581 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
586 name = (char *) dentry->d_name.name;
587 dfid = v9fs_fid_lookup(dentry->d_parent);
590 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
594 /* clone a fid to use for creation */
595 ofid = p9_client_walk(dfid, 0, NULL, 1);
598 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
602 err = p9_client_fcreate(ofid, name, perm, mode, extension);
604 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
608 /* now walk from the parent so we can get unopened fid */
609 fid = p9_client_walk(dfid, 1, &name, 1);
612 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
617 /* instantiate inode and assign the unopened fid to the dentry */
618 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
620 err = PTR_ERR(inode);
621 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
624 d_instantiate(dentry, inode);
625 err = v9fs_fid_add(dentry, fid);
633 p9_client_clunk(ofid);
636 p9_client_clunk(fid);
642 * v9fs_vfs_create - VFS hook to create files
643 * @dir: directory inode that is being created
644 * @dentry: dentry that is being deleted
645 * @mode: create permissions
646 * @nd: path information
651 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
652 struct nameidata *nd)
658 struct v9fs_inode *v9inode;
659 struct v9fs_session_info *v9ses;
660 struct p9_fid *fid, *inode_fid;
664 v9ses = v9fs_inode2v9ses(dir);
665 perm = unixmode2p9mode(v9ses, mode);
667 flags = nd->intent.open.flags;
671 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
672 v9fs_uflags2omode(flags,
673 v9fs_proto_dotu(v9ses)));
680 v9fs_invalidate_inode_attr(dir);
681 /* if we are opening a file, assign the open fid to the file */
683 v9inode = V9FS_I(dentry->d_inode);
684 mutex_lock(&v9inode->v_mutex);
685 if (v9ses->cache && !v9inode->writeback_fid &&
686 ((flags & O_ACCMODE) != O_RDONLY)) {
688 * clone a fid and add it to writeback_fid
689 * we do it during open time instead of
690 * page dirty time via write_begin/page_mkwrite
691 * because we want write after unlink usecase
694 inode_fid = v9fs_writeback_fid(dentry);
695 if (IS_ERR(inode_fid)) {
696 err = PTR_ERR(inode_fid);
697 mutex_unlock(&v9inode->v_mutex);
700 v9inode->writeback_fid = (void *) inode_fid;
702 mutex_unlock(&v9inode->v_mutex);
703 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
709 filp->private_data = fid;
710 #ifdef CONFIG_9P_FSCACHE
712 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
715 p9_client_clunk(fid);
721 p9_client_clunk(fid);
727 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
728 * @dir: inode that is being unlinked
729 * @dentry: dentry that is being unlinked
730 * @mode: mode for new directory
734 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
739 struct v9fs_session_info *v9ses;
741 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
743 v9ses = v9fs_inode2v9ses(dir);
744 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
745 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
751 v9fs_invalidate_inode_attr(dir);
755 p9_client_clunk(fid);
761 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
762 * @dir: inode that is being walked from
763 * @dentry: dentry that is being walked to?
764 * @nameidata: path data
768 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
769 struct nameidata *nameidata)
771 struct super_block *sb;
772 struct v9fs_session_info *v9ses;
773 struct p9_fid *dfid, *fid;
778 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
779 dir, dentry->d_name.name, dentry, nameidata);
781 if (dentry->d_name.len > NAME_MAX)
782 return ERR_PTR(-ENAMETOOLONG);
785 v9ses = v9fs_inode2v9ses(dir);
786 /* We can walk d_parent because we hold the dir->i_mutex */
787 dfid = v9fs_fid_lookup(dentry->d_parent);
789 return ERR_CAST(dfid);
791 name = (char *) dentry->d_name.name;
792 fid = p9_client_walk(dfid, 1, &name, 1);
794 result = PTR_ERR(fid);
795 if (result == -ENOENT) {
800 return ERR_PTR(result);
803 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
805 result = PTR_ERR(inode);
810 result = v9fs_fid_add(dentry, fid);
815 d_add(dentry, inode);
821 p9_client_clunk(fid);
823 return ERR_PTR(result);
827 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
828 * @i: inode that is being unlinked
829 * @d: dentry that is being unlinked
833 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
835 return v9fs_remove(i, d, 0);
839 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
840 * @i: inode that is being unlinked
841 * @d: dentry that is being unlinked
845 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
847 return v9fs_remove(i, d, 1);
851 * v9fs_vfs_rename - VFS hook to rename an inode
852 * @old_dir: old dir inode
853 * @old_dentry: old dentry
854 * @new_dir: new dir inode
855 * @new_dentry: new dentry
860 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
861 struct inode *new_dir, struct dentry *new_dentry)
864 struct inode *old_inode;
865 struct inode *new_inode;
866 struct v9fs_session_info *v9ses;
867 struct p9_fid *oldfid;
868 struct p9_fid *olddirfid;
869 struct p9_fid *newdirfid;
870 struct p9_wstat wstat;
872 P9_DPRINTK(P9_DEBUG_VFS, "\n");
874 old_inode = old_dentry->d_inode;
875 new_inode = new_dentry->d_inode;
876 v9ses = v9fs_inode2v9ses(old_inode);
877 oldfid = v9fs_fid_lookup(old_dentry);
879 return PTR_ERR(oldfid);
881 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
882 if (IS_ERR(olddirfid)) {
883 retval = PTR_ERR(olddirfid);
887 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
888 if (IS_ERR(newdirfid)) {
889 retval = PTR_ERR(newdirfid);
893 down_write(&v9ses->rename_sem);
894 if (v9fs_proto_dotl(v9ses)) {
895 retval = p9_client_rename(oldfid, newdirfid,
896 (char *) new_dentry->d_name.name);
897 if (retval != -ENOSYS)
900 if (old_dentry->d_parent != new_dentry->d_parent) {
902 * 9P .u can only handle file rename in the same directory
905 P9_DPRINTK(P9_DEBUG_ERROR,
906 "old dir and new dir are different\n");
910 v9fs_blank_wstat(&wstat);
911 wstat.muid = v9ses->uname;
912 wstat.name = (char *) new_dentry->d_name.name;
913 retval = p9_client_wstat(oldfid, &wstat);
918 if (S_ISDIR(new_inode->i_mode))
919 clear_nlink(new_inode);
921 drop_nlink(new_inode);
923 if (S_ISDIR(old_inode->i_mode)) {
928 v9fs_invalidate_inode_attr(old_inode);
929 v9fs_invalidate_inode_attr(old_dir);
930 v9fs_invalidate_inode_attr(new_dir);
932 /* successful rename */
933 d_move(old_dentry, new_dentry);
935 up_write(&v9ses->rename_sem);
936 p9_client_clunk(newdirfid);
939 p9_client_clunk(olddirfid);
946 * v9fs_vfs_getattr - retrieve file metadata
947 * @mnt: mount information
948 * @dentry: file to get attributes on
949 * @stat: metadata structure to populate
954 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
958 struct v9fs_session_info *v9ses;
962 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
964 v9ses = v9fs_dentry2v9ses(dentry);
965 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
966 generic_fillattr(dentry->d_inode, stat);
969 fid = v9fs_fid_lookup(dentry);
973 st = p9_client_stat(fid);
977 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
978 generic_fillattr(dentry->d_inode, stat);
986 * v9fs_vfs_setattr - set file metadata
987 * @dentry: file whose metadata to set
988 * @iattr: metadata assignment structure
992 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
995 struct v9fs_session_info *v9ses;
997 struct p9_wstat wstat;
999 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1000 retval = inode_change_ok(dentry->d_inode, iattr);
1005 v9ses = v9fs_dentry2v9ses(dentry);
1006 fid = v9fs_fid_lookup(dentry);
1008 return PTR_ERR(fid);
1010 v9fs_blank_wstat(&wstat);
1011 if (iattr->ia_valid & ATTR_MODE)
1012 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1014 if (iattr->ia_valid & ATTR_MTIME)
1015 wstat.mtime = iattr->ia_mtime.tv_sec;
1017 if (iattr->ia_valid & ATTR_ATIME)
1018 wstat.atime = iattr->ia_atime.tv_sec;
1020 if (iattr->ia_valid & ATTR_SIZE)
1021 wstat.length = iattr->ia_size;
1023 if (v9fs_proto_dotu(v9ses)) {
1024 if (iattr->ia_valid & ATTR_UID)
1025 wstat.n_uid = iattr->ia_uid;
1027 if (iattr->ia_valid & ATTR_GID)
1028 wstat.n_gid = iattr->ia_gid;
1031 /* Write all dirty data */
1032 if (S_ISREG(dentry->d_inode->i_mode))
1033 filemap_write_and_wait(dentry->d_inode->i_mapping);
1035 retval = p9_client_wstat(fid, &wstat);
1039 if ((iattr->ia_valid & ATTR_SIZE) &&
1040 iattr->ia_size != i_size_read(dentry->d_inode))
1041 truncate_setsize(dentry->d_inode, iattr->ia_size);
1043 v9fs_invalidate_inode_attr(dentry->d_inode);
1045 setattr_copy(dentry->d_inode, iattr);
1046 mark_inode_dirty(dentry->d_inode);
1051 * v9fs_stat2inode - populate an inode structure with mistat info
1052 * @stat: Plan 9 metadata (mistat) structure
1053 * @inode: inode to populate
1054 * @sb: superblock of filesystem
1059 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1060 struct super_block *sb)
1064 unsigned int i_nlink;
1065 struct v9fs_session_info *v9ses = sb->s_fs_info;
1066 struct v9fs_inode *v9inode = V9FS_I(inode);
1070 inode->i_atime.tv_sec = stat->atime;
1071 inode->i_mtime.tv_sec = stat->mtime;
1072 inode->i_ctime.tv_sec = stat->mtime;
1074 inode->i_uid = v9ses->dfltuid;
1075 inode->i_gid = v9ses->dfltgid;
1077 if (v9fs_proto_dotu(v9ses)) {
1078 inode->i_uid = stat->n_uid;
1079 inode->i_gid = stat->n_gid;
1081 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1082 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1084 * Hadlink support got added later to
1085 * to the .u extension. So there can be
1086 * server out there that doesn't support
1087 * this even with .u extension. So check
1088 * for non NULL stat->extension
1090 strncpy(ext, stat->extension, sizeof(ext));
1091 /* HARDLINKCOUNT %u */
1092 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1093 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1094 inode->i_nlink = i_nlink;
1097 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1098 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1103 strncpy(ext, stat->extension, sizeof(ext));
1104 sscanf(ext, "%c %u %u", &type, &major, &minor);
1107 inode->i_mode &= ~S_IFBLK;
1108 inode->i_mode |= S_IFCHR;
1113 P9_DPRINTK(P9_DEBUG_ERROR,
1114 "Unknown special type %c %s\n", type,
1117 inode->i_rdev = MKDEV(major, minor);
1118 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1122 i_size_write(inode, stat->length);
1124 /* not real number of blocks, but 512 byte ones ... */
1125 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1126 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1130 * v9fs_qid2ino - convert qid into inode number
1133 * BUG: potential for inode number collisions?
1136 ino_t v9fs_qid2ino(struct p9_qid *qid)
1138 u64 path = qid->path + 2;
1141 if (sizeof(ino_t) == sizeof(path))
1142 memcpy(&i, &path, sizeof(ino_t));
1144 i = (ino_t) (path ^ (path >> 32));
1150 * v9fs_readlink - read a symlink's location (internal version)
1151 * @dentry: dentry for symlink
1152 * @buffer: buffer to load symlink location into
1153 * @buflen: length of buffer
1157 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1161 struct v9fs_session_info *v9ses;
1163 struct p9_wstat *st;
1165 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1167 v9ses = v9fs_dentry2v9ses(dentry);
1168 fid = v9fs_fid_lookup(dentry);
1170 return PTR_ERR(fid);
1172 if (!v9fs_proto_dotu(v9ses))
1175 st = p9_client_stat(fid);
1179 if (!(st->mode & P9_DMSYMLINK)) {
1184 /* copy extension buffer into buffer */
1185 strncpy(buffer, st->extension, buflen);
1187 P9_DPRINTK(P9_DEBUG_VFS,
1188 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1190 retval = strnlen(buffer, buflen);
1198 * v9fs_vfs_follow_link - follow a symlink path
1199 * @dentry: dentry for symlink
1204 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1207 char *link = __getname();
1209 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1212 link = ERR_PTR(-ENOMEM);
1214 len = v9fs_readlink(dentry, link, PATH_MAX);
1218 link = ERR_PTR(len);
1220 link[min(len, PATH_MAX-1)] = 0;
1222 nd_set_link(nd, link);
1228 * v9fs_vfs_put_link - release a symlink path
1229 * @dentry: dentry for symlink
1236 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1238 char *s = nd_get_link(nd);
1240 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1241 IS_ERR(s) ? "<error>" : s);
1247 * v9fs_vfs_mkspecial - create a special file
1248 * @dir: inode to create special file in
1249 * @dentry: dentry to create
1250 * @mode: mode to create special file
1251 * @extension: 9p2000.u format extension string representing special file
1255 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1256 int mode, const char *extension)
1260 struct v9fs_session_info *v9ses;
1262 v9ses = v9fs_inode2v9ses(dir);
1263 if (!v9fs_proto_dotu(v9ses)) {
1264 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1268 perm = unixmode2p9mode(v9ses, mode);
1269 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1272 return PTR_ERR(fid);
1274 v9fs_invalidate_inode_attr(dir);
1275 p9_client_clunk(fid);
1280 * v9fs_vfs_symlink - helper function to create symlinks
1281 * @dir: directory inode containing symlink
1282 * @dentry: dentry for symlink
1283 * @symname: symlink data
1285 * See Also: 9P2000.u RFC for more information
1290 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1292 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1293 dentry->d_name.name, symname);
1295 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1299 * v9fs_vfs_link - create a hardlink
1300 * @old_dentry: dentry for file to link to
1301 * @dir: inode destination for new link
1302 * @dentry: dentry for link
1307 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1308 struct dentry *dentry)
1312 struct p9_fid *oldfid;
1314 P9_DPRINTK(P9_DEBUG_VFS,
1315 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1316 old_dentry->d_name.name);
1318 oldfid = v9fs_fid_clone(old_dentry);
1320 return PTR_ERR(oldfid);
1323 if (unlikely(!name)) {
1328 sprintf(name, "%d\n", oldfid->fid);
1329 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1332 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1333 v9fs_invalidate_inode_attr(dir);
1336 p9_client_clunk(oldfid);
1341 * v9fs_vfs_mknod - create a special file
1342 * @dir: inode destination for new link
1343 * @dentry: dentry for file
1344 * @mode: mode for creation
1345 * @rdev: device associated with special file
1350 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1355 P9_DPRINTK(P9_DEBUG_VFS,
1356 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1357 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1359 if (!new_valid_dev(rdev))
1365 /* build extension */
1367 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1368 else if (S_ISCHR(mode))
1369 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1370 else if (S_ISFIFO(mode))
1372 else if (S_ISSOCK(mode))
1379 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1385 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1388 struct p9_wstat *st;
1389 struct v9fs_session_info *v9ses;
1391 v9ses = v9fs_inode2v9ses(inode);
1392 st = p9_client_stat(fid);
1396 spin_lock(&inode->i_lock);
1398 * We don't want to refresh inode->i_size,
1399 * because we may have cached data
1401 i_size = inode->i_size;
1402 v9fs_stat2inode(st, inode, inode->i_sb);
1404 inode->i_size = i_size;
1405 spin_unlock(&inode->i_lock);
1411 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1412 .create = v9fs_vfs_create,
1413 .lookup = v9fs_vfs_lookup,
1414 .symlink = v9fs_vfs_symlink,
1415 .link = v9fs_vfs_link,
1416 .unlink = v9fs_vfs_unlink,
1417 .mkdir = v9fs_vfs_mkdir,
1418 .rmdir = v9fs_vfs_rmdir,
1419 .mknod = v9fs_vfs_mknod,
1420 .rename = v9fs_vfs_rename,
1421 .getattr = v9fs_vfs_getattr,
1422 .setattr = v9fs_vfs_setattr,
1425 static const struct inode_operations v9fs_dir_inode_operations = {
1426 .create = v9fs_vfs_create,
1427 .lookup = v9fs_vfs_lookup,
1428 .unlink = v9fs_vfs_unlink,
1429 .mkdir = v9fs_vfs_mkdir,
1430 .rmdir = v9fs_vfs_rmdir,
1431 .mknod = v9fs_vfs_mknod,
1432 .rename = v9fs_vfs_rename,
1433 .getattr = v9fs_vfs_getattr,
1434 .setattr = v9fs_vfs_setattr,
1437 static const struct inode_operations v9fs_file_inode_operations = {
1438 .getattr = v9fs_vfs_getattr,
1439 .setattr = v9fs_vfs_setattr,
1442 static const struct inode_operations v9fs_symlink_inode_operations = {
1443 .readlink = generic_readlink,
1444 .follow_link = v9fs_vfs_follow_link,
1445 .put_link = v9fs_vfs_put_link,
1446 .getattr = v9fs_vfs_getattr,
1447 .setattr = v9fs_vfs_setattr,