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 return &v9inode->vfs_inode;
227 * v9fs_destroy_inode - destroy an inode
231 static void v9fs_i_callback(struct rcu_head *head)
233 struct inode *inode = container_of(head, struct inode, i_rcu);
234 INIT_LIST_HEAD(&inode->i_dentry);
235 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
238 void v9fs_destroy_inode(struct inode *inode)
240 call_rcu(&inode->i_rcu, v9fs_i_callback);
243 int v9fs_init_inode(struct v9fs_session_info *v9ses,
244 struct inode *inode, int mode)
248 inode_init_owner(inode, NULL, mode);
251 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
252 inode->i_mapping->a_ops = &v9fs_addr_operations;
254 switch (mode & S_IFMT) {
259 if (v9fs_proto_dotl(v9ses)) {
260 inode->i_op = &v9fs_file_inode_operations_dotl;
261 inode->i_fop = &v9fs_file_operations_dotl;
262 } else if (v9fs_proto_dotu(v9ses)) {
263 inode->i_op = &v9fs_file_inode_operations;
264 inode->i_fop = &v9fs_file_operations;
266 P9_DPRINTK(P9_DEBUG_ERROR,
267 "special files without extended mode\n");
271 init_special_inode(inode, inode->i_mode, inode->i_rdev);
274 if (v9fs_proto_dotl(v9ses)) {
275 inode->i_op = &v9fs_file_inode_operations_dotl;
278 &v9fs_cached_file_operations_dotl;
280 inode->i_fop = &v9fs_file_operations_dotl;
282 inode->i_op = &v9fs_file_inode_operations;
284 inode->i_fop = &v9fs_cached_file_operations;
286 inode->i_fop = &v9fs_file_operations;
291 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
292 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
293 "legacy protocol.\n");
298 if (v9fs_proto_dotl(v9ses))
299 inode->i_op = &v9fs_symlink_inode_operations_dotl;
301 inode->i_op = &v9fs_symlink_inode_operations;
306 if (v9fs_proto_dotl(v9ses))
307 inode->i_op = &v9fs_dir_inode_operations_dotl;
308 else if (v9fs_proto_dotu(v9ses))
309 inode->i_op = &v9fs_dir_inode_operations_dotu;
311 inode->i_op = &v9fs_dir_inode_operations;
313 if (v9fs_proto_dotl(v9ses))
314 inode->i_fop = &v9fs_dir_operations_dotl;
316 inode->i_fop = &v9fs_dir_operations;
320 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
321 mode, mode & S_IFMT);
331 * v9fs_get_inode - helper function to setup an inode
333 * @mode: mode to setup inode with
337 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
341 struct v9fs_session_info *v9ses = sb->s_fs_info;
343 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
345 inode = new_inode(sb);
347 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
348 return ERR_PTR(-ENOMEM);
350 err = v9fs_init_inode(v9ses, inode, mode);
359 static struct v9fs_fid*
360 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
364 struct v9fs_fid *ret;
365 struct v9fs_fcall *fcall;
367 nfid = v9fs_get_idpool(&v9ses->fidpool);
369 eprintk(KERN_WARNING, "no free fids available\n");
370 return ERR_PTR(-ENOSPC);
373 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
377 if (fcall && fcall->id == RWALK)
380 PRINT_FCALL_ERROR("walk error", fcall);
381 v9fs_put_idpool(nfid, &v9ses->fidpool);
387 ret = v9fs_fid_create(v9ses, nfid);
393 err = v9fs_fid_insert(ret, dentry);
395 v9fs_fid_destroy(ret);
402 v9fs_t_clunk(v9ses, nfid);
412 * v9fs_clear_inode - release an inode
413 * @inode: inode to release
416 void v9fs_evict_inode(struct inode *inode)
418 struct v9fs_inode *v9inode = V9FS_I(inode);
420 truncate_inode_pages(inode->i_mapping, 0);
421 end_writeback(inode);
422 filemap_fdatawrite(inode->i_mapping);
424 #ifdef CONFIG_9P_FSCACHE
425 v9fs_cache_inode_put_cookie(inode);
427 /* clunk the fid stashed in writeback_fid */
428 if (v9inode->writeback_fid) {
429 p9_client_clunk(v9inode->writeback_fid);
430 v9inode->writeback_fid = NULL;
434 static struct inode *v9fs_qid_iget(struct super_block *sb,
441 struct v9fs_session_info *v9ses = sb->s_fs_info;
443 i_ino = v9fs_qid2ino(qid);
444 inode = iget_locked(sb, i_ino);
446 return ERR_PTR(-ENOMEM);
447 if (!(inode->i_state & I_NEW))
450 * initialize the inode with the stat info
451 * FIXME!! we may need support for stale inodes
454 umode = p9mode2unixmode(v9ses, st->mode);
455 retval = v9fs_init_inode(v9ses, inode, umode);
459 v9fs_stat2inode(st, inode, sb);
460 #ifdef CONFIG_9P_FSCACHE
461 v9fs_fscache_set_key(inode, &st->qid);
462 v9fs_cache_inode_get_cookie(inode);
464 unlock_new_inode(inode);
467 unlock_new_inode(inode);
469 return ERR_PTR(retval);
474 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
475 struct super_block *sb)
478 struct inode *inode = NULL;
480 st = p9_client_stat(fid);
484 inode = v9fs_qid_iget(sb, &st->qid, st);
491 * v9fs_remove - helper function to remove files and directories
492 * @dir: directory inode that is being deleted
493 * @file: dentry that is being deleted
494 * @rmdir: removing a directory
498 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
501 struct inode *file_inode;
502 struct p9_fid *v9fid;
504 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
507 file_inode = file->d_inode;
508 v9fid = v9fs_fid_clone(file);
510 return PTR_ERR(v9fid);
512 retval = p9_client_remove(v9fid);
514 drop_nlink(file_inode);
519 * v9fs_create - Create a file
520 * @v9ses: session information
521 * @dir: directory that dentry is being created in
522 * @dentry: dentry that is being created
523 * @extension: 9p2000.u extension string to support devices, etc.
524 * @perm: create permissions
528 static struct p9_fid *
529 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
530 struct dentry *dentry, char *extension, u32 perm, u8 mode)
534 struct p9_fid *dfid, *ofid, *fid;
537 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
542 name = (char *) dentry->d_name.name;
543 dfid = v9fs_fid_lookup(dentry->d_parent);
546 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
550 /* clone a fid to use for creation */
551 ofid = p9_client_walk(dfid, 0, NULL, 1);
554 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
558 err = p9_client_fcreate(ofid, name, perm, mode, extension);
560 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
564 /* now walk from the parent so we can get unopened fid */
565 fid = p9_client_walk(dfid, 1, &name, 1);
568 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
573 /* instantiate inode and assign the unopened fid to the dentry */
574 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
576 err = PTR_ERR(inode);
577 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
580 d_instantiate(dentry, inode);
581 err = v9fs_fid_add(dentry, fid);
589 p9_client_clunk(ofid);
592 p9_client_clunk(fid);
598 * v9fs_vfs_create - VFS hook to create files
599 * @dir: directory inode that is being created
600 * @dentry: dentry that is being deleted
601 * @mode: create permissions
602 * @nd: path information
607 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
608 struct nameidata *nd)
614 struct v9fs_inode *v9inode;
615 struct v9fs_session_info *v9ses;
616 struct p9_fid *fid, *inode_fid;
620 v9ses = v9fs_inode2v9ses(dir);
621 perm = unixmode2p9mode(v9ses, mode);
622 if (nd && nd->flags & LOOKUP_OPEN)
623 flags = nd->intent.open.flags - 1;
627 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
628 v9fs_uflags2omode(flags,
629 v9fs_proto_dotu(v9ses)));
636 /* if we are opening a file, assign the open fid to the file */
637 if (nd && nd->flags & LOOKUP_OPEN) {
638 v9inode = V9FS_I(dentry->d_inode);
639 if (v9ses->cache && !v9inode->writeback_fid) {
641 * clone a fid and add it to writeback_fid
642 * we do it during open time instead of
643 * page dirty time via write_begin/page_mkwrite
644 * because we want write after unlink usecase
647 inode_fid = v9fs_writeback_fid(dentry);
648 if (IS_ERR(inode_fid)) {
649 err = PTR_ERR(inode_fid);
652 v9inode->writeback_fid = (void *) inode_fid;
654 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
660 filp->private_data = fid;
661 #ifdef CONFIG_9P_FSCACHE
663 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
666 p9_client_clunk(fid);
672 p9_client_clunk(fid);
678 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
679 * @dir: inode that is being unlinked
680 * @dentry: dentry that is being unlinked
681 * @mode: mode for new directory
685 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
689 struct v9fs_session_info *v9ses;
692 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
694 v9ses = v9fs_inode2v9ses(dir);
695 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
696 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
703 p9_client_clunk(fid);
709 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
710 * @dir: inode that is being walked from
711 * @dentry: dentry that is being walked to?
712 * @nameidata: path data
716 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
717 struct nameidata *nameidata)
719 struct super_block *sb;
720 struct v9fs_session_info *v9ses;
721 struct p9_fid *dfid, *fid;
726 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
727 dir, dentry->d_name.name, dentry, nameidata);
729 if (dentry->d_name.len > NAME_MAX)
730 return ERR_PTR(-ENAMETOOLONG);
733 v9ses = v9fs_inode2v9ses(dir);
734 /* We can walk d_parent because we hold the dir->i_mutex */
735 dfid = v9fs_fid_lookup(dentry->d_parent);
737 return ERR_CAST(dfid);
739 name = (char *) dentry->d_name.name;
740 fid = p9_client_walk(dfid, 1, &name, 1);
742 result = PTR_ERR(fid);
743 if (result == -ENOENT) {
748 return ERR_PTR(result);
751 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
753 result = PTR_ERR(inode);
758 result = v9fs_fid_add(dentry, fid);
763 d_add(dentry, inode);
769 p9_client_clunk(fid);
771 return ERR_PTR(result);
775 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
776 * @i: inode that is being unlinked
777 * @d: dentry that is being unlinked
781 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
783 return v9fs_remove(i, d, 0);
787 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
788 * @i: inode that is being unlinked
789 * @d: dentry that is being unlinked
793 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
795 return v9fs_remove(i, d, 1);
799 * v9fs_vfs_rename - VFS hook to rename an inode
800 * @old_dir: old dir inode
801 * @old_dentry: old dentry
802 * @new_dir: new dir inode
803 * @new_dentry: new dentry
808 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
809 struct inode *new_dir, struct dentry *new_dentry)
811 struct inode *old_inode;
812 struct v9fs_session_info *v9ses;
813 struct p9_fid *oldfid;
814 struct p9_fid *olddirfid;
815 struct p9_fid *newdirfid;
816 struct p9_wstat wstat;
819 P9_DPRINTK(P9_DEBUG_VFS, "\n");
821 old_inode = old_dentry->d_inode;
822 v9ses = v9fs_inode2v9ses(old_inode);
823 oldfid = v9fs_fid_lookup(old_dentry);
825 return PTR_ERR(oldfid);
827 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
828 if (IS_ERR(olddirfid)) {
829 retval = PTR_ERR(olddirfid);
833 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
834 if (IS_ERR(newdirfid)) {
835 retval = PTR_ERR(newdirfid);
839 down_write(&v9ses->rename_sem);
840 if (v9fs_proto_dotl(v9ses)) {
841 retval = p9_client_rename(oldfid, newdirfid,
842 (char *) new_dentry->d_name.name);
843 if (retval != -ENOSYS)
846 if (old_dentry->d_parent != new_dentry->d_parent) {
848 * 9P .u can only handle file rename in the same directory
851 P9_DPRINTK(P9_DEBUG_ERROR,
852 "old dir and new dir are different\n");
856 v9fs_blank_wstat(&wstat);
857 wstat.muid = v9ses->uname;
858 wstat.name = (char *) new_dentry->d_name.name;
859 retval = p9_client_wstat(oldfid, &wstat);
863 /* successful rename */
864 d_move(old_dentry, new_dentry);
865 up_write(&v9ses->rename_sem);
866 p9_client_clunk(newdirfid);
869 p9_client_clunk(olddirfid);
876 * v9fs_vfs_getattr - retrieve file metadata
877 * @mnt: mount information
878 * @dentry: file to get attributes on
879 * @stat: metadata structure to populate
884 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
888 struct v9fs_session_info *v9ses;
892 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
894 v9ses = v9fs_inode2v9ses(dentry->d_inode);
895 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
896 generic_fillattr(dentry->d_inode, stat);
899 fid = v9fs_fid_lookup(dentry);
903 st = p9_client_stat(fid);
907 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
908 generic_fillattr(dentry->d_inode, stat);
916 * v9fs_vfs_setattr - set file metadata
917 * @dentry: file whose metadata to set
918 * @iattr: metadata assignment structure
922 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
925 struct v9fs_session_info *v9ses;
927 struct p9_wstat wstat;
929 P9_DPRINTK(P9_DEBUG_VFS, "\n");
931 v9ses = v9fs_inode2v9ses(dentry->d_inode);
932 fid = v9fs_fid_lookup(dentry);
936 v9fs_blank_wstat(&wstat);
937 if (iattr->ia_valid & ATTR_MODE)
938 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
940 if (iattr->ia_valid & ATTR_MTIME)
941 wstat.mtime = iattr->ia_mtime.tv_sec;
943 if (iattr->ia_valid & ATTR_ATIME)
944 wstat.atime = iattr->ia_atime.tv_sec;
946 if (iattr->ia_valid & ATTR_SIZE)
947 wstat.length = iattr->ia_size;
949 if (v9fs_proto_dotu(v9ses)) {
950 if (iattr->ia_valid & ATTR_UID)
951 wstat.n_uid = iattr->ia_uid;
953 if (iattr->ia_valid & ATTR_GID)
954 wstat.n_gid = iattr->ia_gid;
957 retval = p9_client_wstat(fid, &wstat);
961 if ((iattr->ia_valid & ATTR_SIZE) &&
962 iattr->ia_size != i_size_read(dentry->d_inode)) {
963 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
968 setattr_copy(dentry->d_inode, iattr);
969 mark_inode_dirty(dentry->d_inode);
974 * v9fs_stat2inode - populate an inode structure with mistat info
975 * @stat: Plan 9 metadata (mistat) structure
976 * @inode: inode to populate
977 * @sb: superblock of filesystem
982 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
983 struct super_block *sb)
987 unsigned int i_nlink;
988 struct v9fs_session_info *v9ses = sb->s_fs_info;
992 inode->i_atime.tv_sec = stat->atime;
993 inode->i_mtime.tv_sec = stat->mtime;
994 inode->i_ctime.tv_sec = stat->mtime;
996 inode->i_uid = v9ses->dfltuid;
997 inode->i_gid = v9ses->dfltgid;
999 if (v9fs_proto_dotu(v9ses)) {
1000 inode->i_uid = stat->n_uid;
1001 inode->i_gid = stat->n_gid;
1003 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1004 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1006 * Hadlink support got added later to
1007 * to the .u extension. So there can be
1008 * server out there that doesn't support
1009 * this even with .u extension. So check
1010 * for non NULL stat->extension
1012 strncpy(ext, stat->extension, sizeof(ext));
1013 /* HARDLINKCOUNT %u */
1014 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1015 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1016 inode->i_nlink = i_nlink;
1019 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1020 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1025 strncpy(ext, stat->extension, sizeof(ext));
1026 sscanf(ext, "%c %u %u", &type, &major, &minor);
1029 inode->i_mode &= ~S_IFBLK;
1030 inode->i_mode |= S_IFCHR;
1035 P9_DPRINTK(P9_DEBUG_ERROR,
1036 "Unknown special type %c %s\n", type,
1039 inode->i_rdev = MKDEV(major, minor);
1040 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1044 i_size_write(inode, stat->length);
1046 /* not real number of blocks, but 512 byte ones ... */
1047 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1051 * v9fs_qid2ino - convert qid into inode number
1054 * BUG: potential for inode number collisions?
1057 ino_t v9fs_qid2ino(struct p9_qid *qid)
1059 u64 path = qid->path + 2;
1062 if (sizeof(ino_t) == sizeof(path))
1063 memcpy(&i, &path, sizeof(ino_t));
1065 i = (ino_t) (path ^ (path >> 32));
1071 * v9fs_readlink - read a symlink's location (internal version)
1072 * @dentry: dentry for symlink
1073 * @buffer: buffer to load symlink location into
1074 * @buflen: length of buffer
1078 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1082 struct v9fs_session_info *v9ses;
1084 struct p9_wstat *st;
1086 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1088 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1089 fid = v9fs_fid_lookup(dentry);
1091 return PTR_ERR(fid);
1093 if (!v9fs_proto_dotu(v9ses))
1096 st = p9_client_stat(fid);
1100 if (!(st->mode & P9_DMSYMLINK)) {
1105 /* copy extension buffer into buffer */
1106 strncpy(buffer, st->extension, buflen);
1108 P9_DPRINTK(P9_DEBUG_VFS,
1109 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1111 retval = strnlen(buffer, buflen);
1119 * v9fs_vfs_follow_link - follow a symlink path
1120 * @dentry: dentry for symlink
1125 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1128 char *link = __getname();
1130 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1133 link = ERR_PTR(-ENOMEM);
1135 len = v9fs_readlink(dentry, link, PATH_MAX);
1139 link = ERR_PTR(len);
1141 link[min(len, PATH_MAX-1)] = 0;
1143 nd_set_link(nd, link);
1149 * v9fs_vfs_put_link - release a symlink path
1150 * @dentry: dentry for symlink
1157 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1159 char *s = nd_get_link(nd);
1161 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1162 IS_ERR(s) ? "<error>" : s);
1168 * v9fs_vfs_mkspecial - create a special file
1169 * @dir: inode to create special file in
1170 * @dentry: dentry to create
1171 * @mode: mode to create special file
1172 * @extension: 9p2000.u format extension string representing special file
1176 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1177 int mode, const char *extension)
1180 struct v9fs_session_info *v9ses;
1183 v9ses = v9fs_inode2v9ses(dir);
1184 if (!v9fs_proto_dotu(v9ses)) {
1185 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1189 perm = unixmode2p9mode(v9ses, mode);
1190 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1193 return PTR_ERR(fid);
1195 p9_client_clunk(fid);
1200 * v9fs_vfs_symlink - helper function to create symlinks
1201 * @dir: directory inode containing symlink
1202 * @dentry: dentry for symlink
1203 * @symname: symlink data
1205 * See Also: 9P2000.u RFC for more information
1210 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1212 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1213 dentry->d_name.name, symname);
1215 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1219 * v9fs_vfs_link - create a hardlink
1220 * @old_dentry: dentry for file to link to
1221 * @dir: inode destination for new link
1222 * @dentry: dentry for link
1227 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1228 struct dentry *dentry)
1231 struct p9_fid *oldfid;
1234 P9_DPRINTK(P9_DEBUG_VFS,
1235 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1236 old_dentry->d_name.name);
1238 oldfid = v9fs_fid_clone(old_dentry);
1240 return PTR_ERR(oldfid);
1243 if (unlikely(!name)) {
1248 sprintf(name, "%d\n", oldfid->fid);
1249 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1253 p9_client_clunk(oldfid);
1258 * v9fs_vfs_mknod - create a special file
1259 * @dir: inode destination for new link
1260 * @dentry: dentry for file
1261 * @mode: mode for creation
1262 * @rdev: device associated with special file
1267 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1272 P9_DPRINTK(P9_DEBUG_VFS,
1273 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1274 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1276 if (!new_valid_dev(rdev))
1282 /* build extension */
1284 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1285 else if (S_ISCHR(mode))
1286 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1287 else if (S_ISFIFO(mode))
1289 else if (S_ISSOCK(mode))
1296 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1302 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1303 .create = v9fs_vfs_create,
1304 .lookup = v9fs_vfs_lookup,
1305 .symlink = v9fs_vfs_symlink,
1306 .link = v9fs_vfs_link,
1307 .unlink = v9fs_vfs_unlink,
1308 .mkdir = v9fs_vfs_mkdir,
1309 .rmdir = v9fs_vfs_rmdir,
1310 .mknod = v9fs_vfs_mknod,
1311 .rename = v9fs_vfs_rename,
1312 .getattr = v9fs_vfs_getattr,
1313 .setattr = v9fs_vfs_setattr,
1316 static const struct inode_operations v9fs_dir_inode_operations = {
1317 .create = v9fs_vfs_create,
1318 .lookup = v9fs_vfs_lookup,
1319 .unlink = v9fs_vfs_unlink,
1320 .mkdir = v9fs_vfs_mkdir,
1321 .rmdir = v9fs_vfs_rmdir,
1322 .mknod = v9fs_vfs_mknod,
1323 .rename = v9fs_vfs_rename,
1324 .getattr = v9fs_vfs_getattr,
1325 .setattr = v9fs_vfs_setattr,
1328 static const struct inode_operations v9fs_file_inode_operations = {
1329 .getattr = v9fs_vfs_getattr,
1330 .setattr = v9fs_vfs_setattr,
1333 static const struct inode_operations v9fs_symlink_inode_operations = {
1334 .readlink = generic_readlink,
1335 .follow_link = v9fs_vfs_follow_link,
1336 .put_link = v9fs_vfs_put_link,
1337 .getattr = v9fs_vfs_getattr,
1338 .setattr = v9fs_vfs_setattr,