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;
206 #ifdef CONFIG_9P_FSCACHE
208 * v9fs_alloc_inode - helper function to allocate an inode
209 * This callback is executed before setting up the inode so that we
210 * can associate a vcookie with each inode.
214 struct inode *v9fs_alloc_inode(struct super_block *sb)
216 struct v9fs_cookie *vcookie;
217 vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
222 vcookie->fscache = NULL;
224 spin_lock_init(&vcookie->lock);
225 return &vcookie->inode;
229 * v9fs_destroy_inode - destroy an inode
233 static void v9fs_i_callback(struct rcu_head *head)
235 struct inode *inode = container_of(head, struct inode, i_rcu);
236 INIT_LIST_HEAD(&inode->i_dentry);
237 kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
240 void v9fs_destroy_inode(struct inode *inode)
242 call_rcu(&inode->i_rcu, v9fs_i_callback);
247 * v9fs_get_inode - helper function to setup an inode
249 * @mode: mode to setup inode with
253 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
257 struct v9fs_session_info *v9ses = sb->s_fs_info;
259 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
261 inode = new_inode(sb);
263 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
264 return ERR_PTR(-ENOMEM);
267 inode_init_owner(inode, NULL, mode);
270 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
271 inode->i_mapping->a_ops = &v9fs_addr_operations;
273 switch (mode & S_IFMT) {
278 if (v9fs_proto_dotl(v9ses)) {
279 inode->i_op = &v9fs_file_inode_operations_dotl;
280 inode->i_fop = &v9fs_file_operations_dotl;
281 } else if (v9fs_proto_dotu(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations;
283 inode->i_fop = &v9fs_file_operations;
285 P9_DPRINTK(P9_DEBUG_ERROR,
286 "special files without extended mode\n");
290 init_special_inode(inode, inode->i_mode, inode->i_rdev);
293 if (v9fs_proto_dotl(v9ses)) {
294 inode->i_op = &v9fs_file_inode_operations_dotl;
295 inode->i_fop = &v9fs_file_operations_dotl;
297 inode->i_op = &v9fs_file_inode_operations;
298 inode->i_fop = &v9fs_file_operations;
304 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
305 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
306 "legacy protocol.\n");
311 if (v9fs_proto_dotl(v9ses))
312 inode->i_op = &v9fs_symlink_inode_operations_dotl;
314 inode->i_op = &v9fs_symlink_inode_operations;
319 if (v9fs_proto_dotl(v9ses))
320 inode->i_op = &v9fs_dir_inode_operations_dotl;
321 else if (v9fs_proto_dotu(v9ses))
322 inode->i_op = &v9fs_dir_inode_operations_dotu;
324 inode->i_op = &v9fs_dir_inode_operations;
326 if (v9fs_proto_dotl(v9ses))
327 inode->i_fop = &v9fs_dir_operations_dotl;
329 inode->i_fop = &v9fs_dir_operations;
333 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
334 mode, mode & S_IFMT);
347 static struct v9fs_fid*
348 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
352 struct v9fs_fid *ret;
353 struct v9fs_fcall *fcall;
355 nfid = v9fs_get_idpool(&v9ses->fidpool);
357 eprintk(KERN_WARNING, "no free fids available\n");
358 return ERR_PTR(-ENOSPC);
361 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
365 if (fcall && fcall->id == RWALK)
368 PRINT_FCALL_ERROR("walk error", fcall);
369 v9fs_put_idpool(nfid, &v9ses->fidpool);
375 ret = v9fs_fid_create(v9ses, nfid);
381 err = v9fs_fid_insert(ret, dentry);
383 v9fs_fid_destroy(ret);
390 v9fs_t_clunk(v9ses, nfid);
400 * v9fs_clear_inode - release an inode
401 * @inode: inode to release
404 void v9fs_evict_inode(struct inode *inode)
406 truncate_inode_pages(inode->i_mapping, 0);
407 end_writeback(inode);
408 filemap_fdatawrite(inode->i_mapping);
410 #ifdef CONFIG_9P_FSCACHE
411 v9fs_cache_inode_put_cookie(inode);
416 v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
417 struct super_block *sb)
420 struct inode *ret = NULL;
423 st = p9_client_stat(fid);
427 umode = p9mode2unixmode(v9ses, st->mode);
428 ret = v9fs_get_inode(sb, umode);
434 v9fs_stat2inode(st, ret, sb);
435 ret->i_ino = v9fs_qid2ino(&st->qid);
437 #ifdef CONFIG_9P_FSCACHE
438 v9fs_vcookie_set_qid(ret, &st->qid);
439 v9fs_cache_inode_get_cookie(ret);
451 * v9fs_remove - helper function to remove files and directories
452 * @dir: directory inode that is being deleted
453 * @file: dentry that is being deleted
454 * @rmdir: removing a directory
458 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
461 struct inode *file_inode;
462 struct p9_fid *v9fid;
464 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
467 file_inode = file->d_inode;
468 v9fid = v9fs_fid_clone(file);
470 return PTR_ERR(v9fid);
472 retval = p9_client_remove(v9fid);
474 drop_nlink(file_inode);
479 * v9fs_create - Create a file
480 * @v9ses: session information
481 * @dir: directory that dentry is being created in
482 * @dentry: dentry that is being created
483 * @extension: 9p2000.u extension string to support devices, etc.
484 * @perm: create permissions
488 static struct p9_fid *
489 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
490 struct dentry *dentry, char *extension, u32 perm, u8 mode)
494 struct p9_fid *dfid, *ofid, *fid;
497 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
502 name = (char *) dentry->d_name.name;
503 dfid = v9fs_fid_lookup(dentry->d_parent);
506 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
510 /* clone a fid to use for creation */
511 ofid = p9_client_walk(dfid, 0, NULL, 1);
514 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
518 err = p9_client_fcreate(ofid, name, perm, mode, extension);
520 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
524 /* now walk from the parent so we can get unopened fid */
525 fid = p9_client_walk(dfid, 1, &name, 1);
528 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
533 /* instantiate inode and assign the unopened fid to the dentry */
534 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
536 err = PTR_ERR(inode);
537 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
540 d_instantiate(dentry, inode);
541 err = v9fs_fid_add(dentry, fid);
549 p9_client_clunk(ofid);
552 p9_client_clunk(fid);
558 * v9fs_vfs_create - VFS hook to create files
559 * @dir: directory inode that is being created
560 * @dentry: dentry that is being deleted
561 * @mode: create permissions
562 * @nd: path information
567 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
568 struct nameidata *nd)
573 struct v9fs_session_info *v9ses;
579 v9ses = v9fs_inode2v9ses(dir);
580 perm = unixmode2p9mode(v9ses, mode);
581 if (nd && nd->flags & LOOKUP_OPEN)
582 flags = nd->intent.open.flags - 1;
586 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
587 v9fs_uflags2omode(flags,
588 v9fs_proto_dotu(v9ses)));
595 /* if we are opening a file, assign the open fid to the file */
596 if (nd && nd->flags & LOOKUP_OPEN) {
597 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
603 filp->private_data = fid;
605 p9_client_clunk(fid);
611 p9_client_clunk(fid);
617 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
618 * @dir: inode that is being unlinked
619 * @dentry: dentry that is being unlinked
620 * @mode: mode for new directory
624 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
628 struct v9fs_session_info *v9ses;
631 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
633 v9ses = v9fs_inode2v9ses(dir);
634 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
635 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
642 p9_client_clunk(fid);
648 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
649 * @dir: inode that is being walked from
650 * @dentry: dentry that is being walked to?
651 * @nameidata: path data
655 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
656 struct nameidata *nameidata)
658 struct super_block *sb;
659 struct v9fs_session_info *v9ses;
660 struct p9_fid *dfid, *fid;
665 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
666 dir, dentry->d_name.name, dentry, nameidata);
668 if (dentry->d_name.len > NAME_MAX)
669 return ERR_PTR(-ENAMETOOLONG);
672 v9ses = v9fs_inode2v9ses(dir);
673 /* We can walk d_parent because we hold the dir->i_mutex */
674 dfid = v9fs_fid_lookup(dentry->d_parent);
676 return ERR_CAST(dfid);
678 name = (char *) dentry->d_name.name;
679 fid = p9_client_walk(dfid, 1, &name, 1);
681 result = PTR_ERR(fid);
682 if (result == -ENOENT) {
687 return ERR_PTR(result);
690 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
692 result = PTR_ERR(inode);
697 result = v9fs_fid_add(dentry, fid);
702 d_add(dentry, inode);
708 p9_client_clunk(fid);
710 return ERR_PTR(result);
714 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
715 * @i: inode that is being unlinked
716 * @d: dentry that is being unlinked
720 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
722 return v9fs_remove(i, d, 0);
726 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
727 * @i: inode that is being unlinked
728 * @d: dentry that is being unlinked
732 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
734 return v9fs_remove(i, d, 1);
738 * v9fs_vfs_rename - VFS hook to rename an inode
739 * @old_dir: old dir inode
740 * @old_dentry: old dentry
741 * @new_dir: new dir inode
742 * @new_dentry: new dentry
747 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
748 struct inode *new_dir, struct dentry *new_dentry)
750 struct inode *old_inode;
751 struct v9fs_session_info *v9ses;
752 struct p9_fid *oldfid;
753 struct p9_fid *olddirfid;
754 struct p9_fid *newdirfid;
755 struct p9_wstat wstat;
758 P9_DPRINTK(P9_DEBUG_VFS, "\n");
760 old_inode = old_dentry->d_inode;
761 v9ses = v9fs_inode2v9ses(old_inode);
762 oldfid = v9fs_fid_lookup(old_dentry);
764 return PTR_ERR(oldfid);
766 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
767 if (IS_ERR(olddirfid)) {
768 retval = PTR_ERR(olddirfid);
772 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
773 if (IS_ERR(newdirfid)) {
774 retval = PTR_ERR(newdirfid);
778 down_write(&v9ses->rename_sem);
779 if (v9fs_proto_dotl(v9ses)) {
780 retval = p9_client_rename(oldfid, newdirfid,
781 (char *) new_dentry->d_name.name);
782 if (retval != -ENOSYS)
785 if (old_dentry->d_parent != new_dentry->d_parent) {
787 * 9P .u can only handle file rename in the same directory
790 P9_DPRINTK(P9_DEBUG_ERROR,
791 "old dir and new dir are different\n");
795 v9fs_blank_wstat(&wstat);
796 wstat.muid = v9ses->uname;
797 wstat.name = (char *) new_dentry->d_name.name;
798 retval = p9_client_wstat(oldfid, &wstat);
802 /* successful rename */
803 d_move(old_dentry, new_dentry);
804 up_write(&v9ses->rename_sem);
805 p9_client_clunk(newdirfid);
808 p9_client_clunk(olddirfid);
815 * v9fs_vfs_getattr - retrieve file metadata
816 * @mnt: mount information
817 * @dentry: file to get attributes on
818 * @stat: metadata structure to populate
823 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
827 struct v9fs_session_info *v9ses;
831 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
833 v9ses = v9fs_inode2v9ses(dentry->d_inode);
834 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
835 return simple_getattr(mnt, dentry, stat);
837 fid = v9fs_fid_lookup(dentry);
841 st = p9_client_stat(fid);
845 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
846 generic_fillattr(dentry->d_inode, stat);
854 * v9fs_vfs_setattr - set file metadata
855 * @dentry: file whose metadata to set
856 * @iattr: metadata assignment structure
860 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
863 struct v9fs_session_info *v9ses;
865 struct p9_wstat wstat;
867 P9_DPRINTK(P9_DEBUG_VFS, "\n");
869 v9ses = v9fs_inode2v9ses(dentry->d_inode);
870 fid = v9fs_fid_lookup(dentry);
874 v9fs_blank_wstat(&wstat);
875 if (iattr->ia_valid & ATTR_MODE)
876 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
878 if (iattr->ia_valid & ATTR_MTIME)
879 wstat.mtime = iattr->ia_mtime.tv_sec;
881 if (iattr->ia_valid & ATTR_ATIME)
882 wstat.atime = iattr->ia_atime.tv_sec;
884 if (iattr->ia_valid & ATTR_SIZE)
885 wstat.length = iattr->ia_size;
887 if (v9fs_proto_dotu(v9ses)) {
888 if (iattr->ia_valid & ATTR_UID)
889 wstat.n_uid = iattr->ia_uid;
891 if (iattr->ia_valid & ATTR_GID)
892 wstat.n_gid = iattr->ia_gid;
895 retval = p9_client_wstat(fid, &wstat);
899 if ((iattr->ia_valid & ATTR_SIZE) &&
900 iattr->ia_size != i_size_read(dentry->d_inode)) {
901 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
906 setattr_copy(dentry->d_inode, iattr);
907 mark_inode_dirty(dentry->d_inode);
912 * v9fs_stat2inode - populate an inode structure with mistat info
913 * @stat: Plan 9 metadata (mistat) structure
914 * @inode: inode to populate
915 * @sb: superblock of filesystem
920 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
921 struct super_block *sb)
925 unsigned int i_nlink;
926 struct v9fs_session_info *v9ses = sb->s_fs_info;
930 inode->i_atime.tv_sec = stat->atime;
931 inode->i_mtime.tv_sec = stat->mtime;
932 inode->i_ctime.tv_sec = stat->mtime;
934 inode->i_uid = v9ses->dfltuid;
935 inode->i_gid = v9ses->dfltgid;
937 if (v9fs_proto_dotu(v9ses)) {
938 inode->i_uid = stat->n_uid;
939 inode->i_gid = stat->n_gid;
941 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
942 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
944 * Hadlink support got added later to
945 * to the .u extension. So there can be
946 * server out there that doesn't support
947 * this even with .u extension. So check
948 * for non NULL stat->extension
950 strncpy(ext, stat->extension, sizeof(ext));
951 /* HARDLINKCOUNT %u */
952 sscanf(ext, "%13s %u", tag_name, &i_nlink);
953 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
954 inode->i_nlink = i_nlink;
957 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
958 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
963 strncpy(ext, stat->extension, sizeof(ext));
964 sscanf(ext, "%c %u %u", &type, &major, &minor);
967 inode->i_mode &= ~S_IFBLK;
968 inode->i_mode |= S_IFCHR;
973 P9_DPRINTK(P9_DEBUG_ERROR,
974 "Unknown special type %c %s\n", type,
977 inode->i_rdev = MKDEV(major, minor);
978 init_special_inode(inode, inode->i_mode, inode->i_rdev);
982 i_size_write(inode, stat->length);
984 /* not real number of blocks, but 512 byte ones ... */
985 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
989 * v9fs_qid2ino - convert qid into inode number
992 * BUG: potential for inode number collisions?
995 ino_t v9fs_qid2ino(struct p9_qid *qid)
997 u64 path = qid->path + 2;
1000 if (sizeof(ino_t) == sizeof(path))
1001 memcpy(&i, &path, sizeof(ino_t));
1003 i = (ino_t) (path ^ (path >> 32));
1009 * v9fs_readlink - read a symlink's location (internal version)
1010 * @dentry: dentry for symlink
1011 * @buffer: buffer to load symlink location into
1012 * @buflen: length of buffer
1016 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1020 struct v9fs_session_info *v9ses;
1022 struct p9_wstat *st;
1024 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1026 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1027 fid = v9fs_fid_lookup(dentry);
1029 return PTR_ERR(fid);
1031 if (!v9fs_proto_dotu(v9ses))
1034 st = p9_client_stat(fid);
1038 if (!(st->mode & P9_DMSYMLINK)) {
1043 /* copy extension buffer into buffer */
1044 strncpy(buffer, st->extension, buflen);
1046 P9_DPRINTK(P9_DEBUG_VFS,
1047 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1049 retval = strnlen(buffer, buflen);
1057 * v9fs_vfs_follow_link - follow a symlink path
1058 * @dentry: dentry for symlink
1063 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1066 char *link = __getname();
1068 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1071 link = ERR_PTR(-ENOMEM);
1073 len = v9fs_readlink(dentry, link, PATH_MAX);
1077 link = ERR_PTR(len);
1079 link[min(len, PATH_MAX-1)] = 0;
1081 nd_set_link(nd, link);
1087 * v9fs_vfs_put_link - release a symlink path
1088 * @dentry: dentry for symlink
1095 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1097 char *s = nd_get_link(nd);
1099 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1100 IS_ERR(s) ? "<error>" : s);
1106 * v9fs_vfs_mkspecial - create a special file
1107 * @dir: inode to create special file in
1108 * @dentry: dentry to create
1109 * @mode: mode to create special file
1110 * @extension: 9p2000.u format extension string representing special file
1114 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1115 int mode, const char *extension)
1118 struct v9fs_session_info *v9ses;
1121 v9ses = v9fs_inode2v9ses(dir);
1122 if (!v9fs_proto_dotu(v9ses)) {
1123 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1127 perm = unixmode2p9mode(v9ses, mode);
1128 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1131 return PTR_ERR(fid);
1133 p9_client_clunk(fid);
1138 * v9fs_vfs_symlink - helper function to create symlinks
1139 * @dir: directory inode containing symlink
1140 * @dentry: dentry for symlink
1141 * @symname: symlink data
1143 * See Also: 9P2000.u RFC for more information
1148 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1150 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1151 dentry->d_name.name, symname);
1153 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1157 * v9fs_vfs_link - create a hardlink
1158 * @old_dentry: dentry for file to link to
1159 * @dir: inode destination for new link
1160 * @dentry: dentry for link
1165 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1166 struct dentry *dentry)
1169 struct p9_fid *oldfid;
1172 P9_DPRINTK(P9_DEBUG_VFS,
1173 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1174 old_dentry->d_name.name);
1176 oldfid = v9fs_fid_clone(old_dentry);
1178 return PTR_ERR(oldfid);
1181 if (unlikely(!name)) {
1186 sprintf(name, "%d\n", oldfid->fid);
1187 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1191 p9_client_clunk(oldfid);
1196 * v9fs_vfs_mknod - create a special file
1197 * @dir: inode destination for new link
1198 * @dentry: dentry for file
1199 * @mode: mode for creation
1200 * @rdev: device associated with special file
1205 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1210 P9_DPRINTK(P9_DEBUG_VFS,
1211 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1212 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1214 if (!new_valid_dev(rdev))
1220 /* build extension */
1222 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1223 else if (S_ISCHR(mode))
1224 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1225 else if (S_ISFIFO(mode))
1227 else if (S_ISSOCK(mode))
1234 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1240 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1241 .create = v9fs_vfs_create,
1242 .lookup = v9fs_vfs_lookup,
1243 .symlink = v9fs_vfs_symlink,
1244 .link = v9fs_vfs_link,
1245 .unlink = v9fs_vfs_unlink,
1246 .mkdir = v9fs_vfs_mkdir,
1247 .rmdir = v9fs_vfs_rmdir,
1248 .mknod = v9fs_vfs_mknod,
1249 .rename = v9fs_vfs_rename,
1250 .getattr = v9fs_vfs_getattr,
1251 .setattr = v9fs_vfs_setattr,
1254 static const struct inode_operations v9fs_dir_inode_operations = {
1255 .create = v9fs_vfs_create,
1256 .lookup = v9fs_vfs_lookup,
1257 .unlink = v9fs_vfs_unlink,
1258 .mkdir = v9fs_vfs_mkdir,
1259 .rmdir = v9fs_vfs_rmdir,
1260 .mknod = v9fs_vfs_mknod,
1261 .rename = v9fs_vfs_rename,
1262 .getattr = v9fs_vfs_getattr,
1263 .setattr = v9fs_vfs_setattr,
1266 static const struct inode_operations v9fs_file_inode_operations = {
1267 .getattr = v9fs_vfs_getattr,
1268 .setattr = v9fs_vfs_setattr,
1271 static const struct inode_operations v9fs_symlink_inode_operations = {
1272 .readlink = generic_readlink,
1273 .follow_link = v9fs_vfs_follow_link,
1274 .put_link = v9fs_vfs_put_link,
1275 .getattr = v9fs_vfs_getattr,
1276 .setattr = v9fs_vfs_setattr,