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 <net/9p/9p.h>
39 #include <net/9p/client.h>
46 static const struct inode_operations v9fs_dir_inode_operations;
47 static const struct inode_operations v9fs_dir_inode_operations_dotu;
48 static const struct inode_operations v9fs_dir_inode_operations_dotl;
49 static const struct inode_operations v9fs_file_inode_operations;
50 static const struct inode_operations v9fs_file_inode_operations_dotl;
51 static const struct inode_operations v9fs_symlink_inode_operations;
52 static const struct inode_operations v9fs_symlink_inode_operations_dotl;
55 * unixmode2p9mode - convert unix mode bits to plan 9
56 * @v9ses: v9fs session information
57 * @mode: mode to convert
61 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
67 if (v9fs_proto_dotu(v9ses)) {
70 if (v9ses->nodev == 0) {
74 res |= P9_DMNAMEDPIPE;
81 if ((mode & S_ISUID) == S_ISUID)
83 if ((mode & S_ISGID) == S_ISGID)
85 if ((mode & S_ISVTX) == S_ISVTX)
87 if ((mode & P9_DMLINK))
95 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
96 * @v9ses: v9fs session information
97 * @mode: mode to convert
101 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
107 if ((mode & P9_DMDIR) == P9_DMDIR)
109 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
111 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
112 && (v9ses->nodev == 0))
114 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
115 && (v9ses->nodev == 0))
117 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
118 && (v9ses->nodev == 0))
123 if (v9fs_proto_dotu(v9ses)) {
124 if ((mode & P9_DMSETUID) == P9_DMSETUID)
127 if ((mode & P9_DMSETGID) == P9_DMSETGID)
130 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
138 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
139 * @uflags: flags to convert
140 * @extended: if .u extensions are active
143 int v9fs_uflags2omode(int uflags, int extended)
163 if (uflags & O_TRUNC)
170 if (uflags & O_APPEND)
178 * v9fs_blank_wstat - helper function to setup a 9P stat structure
179 * @wstat: structure to initialize
184 v9fs_blank_wstat(struct p9_wstat *wstat)
188 wstat->qid.type = ~0;
189 wstat->qid.version = ~0;
190 *((long long *)&wstat->qid.path) = ~0;
202 wstat->extension = NULL;
205 #ifdef CONFIG_9P_FSCACHE
207 * v9fs_alloc_inode - helper function to allocate an inode
208 * This callback is executed before setting up the inode so that we
209 * can associate a vcookie with each inode.
213 struct inode *v9fs_alloc_inode(struct super_block *sb)
215 struct v9fs_cookie *vcookie;
216 vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
221 vcookie->fscache = NULL;
223 spin_lock_init(&vcookie->lock);
224 return &vcookie->inode;
228 * v9fs_destroy_inode - destroy an inode
232 void v9fs_destroy_inode(struct inode *inode)
234 kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
239 * v9fs_get_inode - helper function to setup an inode
241 * @mode: mode to setup inode with
245 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
249 struct v9fs_session_info *v9ses = sb->s_fs_info;
251 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
253 inode = new_inode(sb);
255 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
256 return ERR_PTR(-ENOMEM);
259 inode->i_mode = mode;
260 inode->i_uid = current_fsuid();
261 inode->i_gid = current_fsgid();
264 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
265 inode->i_mapping->a_ops = &v9fs_addr_operations;
267 switch (mode & S_IFMT) {
272 if (!v9fs_proto_dotu(v9ses)) {
273 P9_DPRINTK(P9_DEBUG_ERROR,
274 "special files without extended mode\n");
278 init_special_inode(inode, inode->i_mode, inode->i_rdev);
281 if (v9fs_proto_dotl(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations_dotl;
283 inode->i_fop = &v9fs_file_operations_dotl;
285 inode->i_op = &v9fs_file_inode_operations;
286 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);
335 static struct v9fs_fid*
336 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
340 struct v9fs_fid *ret;
341 struct v9fs_fcall *fcall;
343 nfid = v9fs_get_idpool(&v9ses->fidpool);
345 eprintk(KERN_WARNING, "no free fids available\n");
346 return ERR_PTR(-ENOSPC);
349 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
353 if (fcall && fcall->id == RWALK)
356 PRINT_FCALL_ERROR("walk error", fcall);
357 v9fs_put_idpool(nfid, &v9ses->fidpool);
363 ret = v9fs_fid_create(v9ses, nfid);
369 err = v9fs_fid_insert(ret, dentry);
371 v9fs_fid_destroy(ret);
378 v9fs_t_clunk(v9ses, nfid);
388 * v9fs_clear_inode - release an inode
389 * @inode: inode to release
392 void v9fs_clear_inode(struct inode *inode)
394 filemap_fdatawrite(inode->i_mapping);
396 #ifdef CONFIG_9P_FSCACHE
397 v9fs_cache_inode_put_cookie(inode);
402 * v9fs_inode_from_fid - populate an inode by issuing a attribute request
403 * @v9ses: session information
404 * @fid: fid to issue attribute request for
405 * @sb: superblock on which to create inode
409 static struct inode *
410 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
411 struct super_block *sb)
418 st = p9_client_stat(fid);
422 umode = p9mode2unixmode(v9ses, st->mode);
423 ret = v9fs_get_inode(sb, umode);
429 v9fs_stat2inode(st, ret, sb);
430 ret->i_ino = v9fs_qid2ino(&st->qid);
432 #ifdef CONFIG_9P_FSCACHE
433 v9fs_vcookie_set_qid(ret, &st->qid);
434 v9fs_cache_inode_get_cookie(ret);
448 * v9fs_remove - helper function to remove files and directories
449 * @dir: directory inode that is being deleted
450 * @file: dentry that is being deleted
451 * @rmdir: removing a directory
455 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
458 struct inode *file_inode;
459 struct v9fs_session_info *v9ses;
460 struct p9_fid *v9fid;
462 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
465 file_inode = file->d_inode;
466 v9ses = v9fs_inode2v9ses(file_inode);
467 v9fid = v9fs_fid_clone(file);
469 return PTR_ERR(v9fid);
471 retval = p9_client_remove(v9fid);
473 drop_nlink(file_inode);
478 v9fs_open_created(struct inode *inode, struct file *file)
485 * v9fs_create - Create a file
486 * @v9ses: session information
487 * @dir: directory that dentry is being created in
488 * @dentry: dentry that is being created
489 * @extension: 9p2000.u extension string to support devices, etc.
490 * @perm: create permissions
494 static struct p9_fid *
495 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
496 struct dentry *dentry, char *extension, u32 perm, u8 mode)
500 struct p9_fid *dfid, *ofid, *fid;
503 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
508 name = (char *) dentry->d_name.name;
509 dfid = v9fs_fid_clone(dentry->d_parent);
512 P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err);
517 /* clone a fid to use for creation */
518 ofid = p9_client_walk(dfid, 0, NULL, 1);
521 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
526 err = p9_client_fcreate(ofid, name, perm, mode, extension);
528 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
532 /* now walk from the parent so we can get unopened fid */
533 fid = p9_client_walk(dfid, 1, &name, 0);
536 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
542 /* instantiate inode and assign the unopened fid to the dentry */
543 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
545 err = PTR_ERR(inode);
546 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
551 dentry->d_op = &v9fs_cached_dentry_operations;
553 dentry->d_op = &v9fs_dentry_operations;
555 d_instantiate(dentry, inode);
556 err = v9fs_fid_add(dentry, fid);
564 p9_client_clunk(dfid);
567 p9_client_clunk(ofid);
570 p9_client_clunk(fid);
576 * v9fs_vfs_create - VFS hook to create files
577 * @dir: directory inode that is being created
578 * @dentry: dentry that is being deleted
579 * @mode: create permissions
580 * @nd: path information
585 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
586 struct nameidata *nd)
591 struct v9fs_session_info *v9ses;
597 v9ses = v9fs_inode2v9ses(dir);
598 perm = unixmode2p9mode(v9ses, mode);
599 if (nd && nd->flags & LOOKUP_OPEN)
600 flags = nd->intent.open.flags - 1;
604 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
605 v9fs_uflags2omode(flags,
606 v9fs_proto_dotu(v9ses)));
613 /* if we are opening a file, assign the open fid to the file */
614 if (nd && nd->flags & LOOKUP_OPEN) {
615 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
621 filp->private_data = fid;
623 p9_client_clunk(fid);
629 p9_client_clunk(fid);
635 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
636 * @dir: inode that is being unlinked
637 * @dentry: dentry that is being unlinked
638 * @mode: mode for new directory
642 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
646 struct v9fs_session_info *v9ses;
649 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
651 v9ses = v9fs_inode2v9ses(dir);
652 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
653 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
660 p9_client_clunk(fid);
666 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
667 * @dir: inode that is being walked from
668 * @dentry: dentry that is being walked to?
669 * @nameidata: path data
673 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
674 struct nameidata *nameidata)
676 struct super_block *sb;
677 struct v9fs_session_info *v9ses;
678 struct p9_fid *dfid, *fid;
683 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
684 dir, dentry->d_name.name, dentry, nameidata);
686 if (dentry->d_name.len > NAME_MAX)
687 return ERR_PTR(-ENAMETOOLONG);
690 v9ses = v9fs_inode2v9ses(dir);
691 dfid = v9fs_fid_lookup(dentry->d_parent);
693 return ERR_CAST(dfid);
695 name = (char *) dentry->d_name.name;
696 fid = p9_client_walk(dfid, 1, &name, 1);
698 result = PTR_ERR(fid);
699 if (result == -ENOENT) {
704 return ERR_PTR(result);
707 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
709 result = PTR_ERR(inode);
714 result = v9fs_fid_add(dentry, fid);
718 if ((fid->qid.version) && (v9ses->cache))
719 dentry->d_op = &v9fs_cached_dentry_operations;
721 dentry->d_op = &v9fs_dentry_operations;
723 d_add(dentry, inode);
727 p9_client_clunk(fid);
729 return ERR_PTR(result);
733 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
734 * @i: inode that is being unlinked
735 * @d: dentry that is being unlinked
739 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
741 return v9fs_remove(i, d, 0);
745 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
746 * @i: inode that is being unlinked
747 * @d: dentry that is being unlinked
751 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
753 return v9fs_remove(i, d, 1);
757 * v9fs_vfs_rename - VFS hook to rename an inode
758 * @old_dir: old dir inode
759 * @old_dentry: old dentry
760 * @new_dir: new dir inode
761 * @new_dentry: new dentry
766 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
767 struct inode *new_dir, struct dentry *new_dentry)
769 struct inode *old_inode;
770 struct v9fs_session_info *v9ses;
771 struct p9_fid *oldfid;
772 struct p9_fid *olddirfid;
773 struct p9_fid *newdirfid;
774 struct p9_wstat wstat;
777 P9_DPRINTK(P9_DEBUG_VFS, "\n");
779 old_inode = old_dentry->d_inode;
780 v9ses = v9fs_inode2v9ses(old_inode);
781 oldfid = v9fs_fid_lookup(old_dentry);
783 return PTR_ERR(oldfid);
785 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
786 if (IS_ERR(olddirfid)) {
787 retval = PTR_ERR(olddirfid);
791 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
792 if (IS_ERR(newdirfid)) {
793 retval = PTR_ERR(newdirfid);
797 if (v9fs_proto_dotl(v9ses)) {
798 retval = p9_client_rename(oldfid, newdirfid,
799 (char *) new_dentry->d_name.name);
800 if (retval != -ENOSYS)
804 /* 9P can only handle file rename in the same directory */
805 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
806 P9_DPRINTK(P9_DEBUG_ERROR,
807 "old dir and new dir are different\n");
812 v9fs_blank_wstat(&wstat);
813 wstat.muid = v9ses->uname;
814 wstat.name = (char *) new_dentry->d_name.name;
815 retval = p9_client_wstat(oldfid, &wstat);
818 p9_client_clunk(newdirfid);
821 p9_client_clunk(olddirfid);
828 * v9fs_vfs_getattr - retrieve file metadata
829 * @mnt: mount information
830 * @dentry: file to get attributes on
831 * @stat: metadata structure to populate
836 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
840 struct v9fs_session_info *v9ses;
844 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
846 v9ses = v9fs_inode2v9ses(dentry->d_inode);
847 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
848 return simple_getattr(mnt, dentry, stat);
850 fid = v9fs_fid_lookup(dentry);
854 st = p9_client_stat(fid);
858 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
859 generic_fillattr(dentry->d_inode, stat);
866 * v9fs_vfs_setattr - set file metadata
867 * @dentry: file whose metadata to set
868 * @iattr: metadata assignment structure
872 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
875 struct v9fs_session_info *v9ses;
877 struct p9_wstat wstat;
879 P9_DPRINTK(P9_DEBUG_VFS, "\n");
881 v9ses = v9fs_inode2v9ses(dentry->d_inode);
882 fid = v9fs_fid_lookup(dentry);
886 v9fs_blank_wstat(&wstat);
887 if (iattr->ia_valid & ATTR_MODE)
888 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
890 if (iattr->ia_valid & ATTR_MTIME)
891 wstat.mtime = iattr->ia_mtime.tv_sec;
893 if (iattr->ia_valid & ATTR_ATIME)
894 wstat.atime = iattr->ia_atime.tv_sec;
896 if (iattr->ia_valid & ATTR_SIZE)
897 wstat.length = iattr->ia_size;
899 if (v9fs_proto_dotu(v9ses)) {
900 if (iattr->ia_valid & ATTR_UID)
901 wstat.n_uid = iattr->ia_uid;
903 if (iattr->ia_valid & ATTR_GID)
904 wstat.n_gid = iattr->ia_gid;
907 retval = p9_client_wstat(fid, &wstat);
909 retval = inode_setattr(dentry->d_inode, iattr);
915 * v9fs_stat2inode - populate an inode structure with mistat info
916 * @stat: Plan 9 metadata (mistat) structure
917 * @inode: inode to populate
918 * @sb: superblock of filesystem
923 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
924 struct super_block *sb)
928 unsigned int i_nlink;
929 struct v9fs_session_info *v9ses = sb->s_fs_info;
933 inode->i_atime.tv_sec = stat->atime;
934 inode->i_mtime.tv_sec = stat->mtime;
935 inode->i_ctime.tv_sec = stat->mtime;
937 inode->i_uid = v9ses->dfltuid;
938 inode->i_gid = v9ses->dfltgid;
940 if (v9fs_proto_dotu(v9ses)) {
941 inode->i_uid = stat->n_uid;
942 inode->i_gid = stat->n_gid;
944 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
945 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
947 * Hadlink support got added later to
948 * to the .u extension. So there can be
949 * server out there that doesn't support
950 * this even with .u extension. So check
951 * for non NULL stat->extension
953 strncpy(ext, stat->extension, sizeof(ext));
954 /* HARDLINKCOUNT %u */
955 sscanf(ext, "%13s %u", tag_name, &i_nlink);
956 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
957 inode->i_nlink = i_nlink;
960 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
961 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
966 strncpy(ext, stat->extension, sizeof(ext));
967 sscanf(ext, "%c %u %u", &type, &major, &minor);
970 inode->i_mode &= ~S_IFBLK;
971 inode->i_mode |= S_IFCHR;
976 P9_DPRINTK(P9_DEBUG_ERROR,
977 "Unknown special type %c %s\n", type,
980 inode->i_rdev = MKDEV(major, minor);
981 init_special_inode(inode, inode->i_mode, inode->i_rdev);
985 i_size_write(inode, stat->length);
987 /* not real number of blocks, but 512 byte ones ... */
988 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
992 * v9fs_qid2ino - convert qid into inode number
995 * BUG: potential for inode number collisions?
998 ino_t v9fs_qid2ino(struct p9_qid *qid)
1000 u64 path = qid->path + 2;
1003 if (sizeof(ino_t) == sizeof(path))
1004 memcpy(&i, &path, sizeof(ino_t));
1006 i = (ino_t) (path ^ (path >> 32));
1012 * v9fs_readlink - read a symlink's location (internal version)
1013 * @dentry: dentry for symlink
1014 * @buffer: buffer to load symlink location into
1015 * @buflen: length of buffer
1019 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1023 struct v9fs_session_info *v9ses;
1025 struct p9_wstat *st;
1027 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1029 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1030 fid = v9fs_fid_lookup(dentry);
1032 return PTR_ERR(fid);
1034 if (!v9fs_proto_dotu(v9ses))
1037 st = p9_client_stat(fid);
1041 if (!(st->mode & P9_DMSYMLINK)) {
1046 /* copy extension buffer into buffer */
1047 strncpy(buffer, st->extension, buflen);
1049 P9_DPRINTK(P9_DEBUG_VFS,
1050 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1052 retval = strnlen(buffer, buflen);
1059 * v9fs_vfs_follow_link - follow a symlink path
1060 * @dentry: dentry for symlink
1065 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1068 char *link = __getname();
1070 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1073 link = ERR_PTR(-ENOMEM);
1075 len = v9fs_readlink(dentry, link, PATH_MAX);
1079 link = ERR_PTR(len);
1081 link[min(len, PATH_MAX-1)] = 0;
1083 nd_set_link(nd, link);
1089 * v9fs_vfs_put_link - release a symlink path
1090 * @dentry: dentry for symlink
1097 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1099 char *s = nd_get_link(nd);
1101 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1102 IS_ERR(s) ? "<error>" : s);
1108 * v9fs_vfs_mkspecial - create a special file
1109 * @dir: inode to create special file in
1110 * @dentry: dentry to create
1111 * @mode: mode to create special file
1112 * @extension: 9p2000.u format extension string representing special file
1116 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1117 int mode, const char *extension)
1120 struct v9fs_session_info *v9ses;
1123 v9ses = v9fs_inode2v9ses(dir);
1124 if (!v9fs_proto_dotu(v9ses)) {
1125 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1129 perm = unixmode2p9mode(v9ses, mode);
1130 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1133 return PTR_ERR(fid);
1135 p9_client_clunk(fid);
1140 * v9fs_vfs_symlink - helper function to create symlinks
1141 * @dir: directory inode containing symlink
1142 * @dentry: dentry for symlink
1143 * @symname: symlink data
1145 * See Also: 9P2000.u RFC for more information
1150 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1152 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1153 dentry->d_name.name, symname);
1155 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1159 * v9fs_vfs_link - create a hardlink
1160 * @old_dentry: dentry for file to link to
1161 * @dir: inode destination for new link
1162 * @dentry: dentry for link
1167 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1168 struct dentry *dentry)
1171 struct p9_fid *oldfid;
1174 P9_DPRINTK(P9_DEBUG_VFS,
1175 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1176 old_dentry->d_name.name);
1178 oldfid = v9fs_fid_clone(old_dentry);
1180 return PTR_ERR(oldfid);
1183 if (unlikely(!name)) {
1188 sprintf(name, "%d\n", oldfid->fid);
1189 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1193 p9_client_clunk(oldfid);
1198 * v9fs_vfs_mknod - create a special file
1199 * @dir: inode destination for new link
1200 * @dentry: dentry for file
1201 * @mode: mode for creation
1202 * @rdev: device associated with special file
1207 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1212 P9_DPRINTK(P9_DEBUG_VFS,
1213 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1214 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1216 if (!new_valid_dev(rdev))
1222 /* build extension */
1224 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1225 else if (S_ISCHR(mode))
1226 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1227 else if (S_ISFIFO(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_dotl = {
1255 .create = v9fs_vfs_create,
1256 .lookup = v9fs_vfs_lookup,
1257 .symlink = v9fs_vfs_symlink,
1258 .link = v9fs_vfs_link,
1259 .unlink = v9fs_vfs_unlink,
1260 .mkdir = v9fs_vfs_mkdir,
1261 .rmdir = v9fs_vfs_rmdir,
1262 .mknod = v9fs_vfs_mknod,
1263 .rename = v9fs_vfs_rename,
1264 .getattr = v9fs_vfs_getattr,
1265 .setattr = v9fs_vfs_setattr,
1268 static const struct inode_operations v9fs_dir_inode_operations = {
1269 .create = v9fs_vfs_create,
1270 .lookup = v9fs_vfs_lookup,
1271 .unlink = v9fs_vfs_unlink,
1272 .mkdir = v9fs_vfs_mkdir,
1273 .rmdir = v9fs_vfs_rmdir,
1274 .mknod = v9fs_vfs_mknod,
1275 .rename = v9fs_vfs_rename,
1276 .getattr = v9fs_vfs_getattr,
1277 .setattr = v9fs_vfs_setattr,
1280 static const struct inode_operations v9fs_file_inode_operations = {
1281 .getattr = v9fs_vfs_getattr,
1282 .setattr = v9fs_vfs_setattr,
1285 static const struct inode_operations v9fs_file_inode_operations_dotl = {
1286 .getattr = v9fs_vfs_getattr,
1287 .setattr = v9fs_vfs_setattr,
1290 static const struct inode_operations v9fs_symlink_inode_operations = {
1291 .readlink = generic_readlink,
1292 .follow_link = v9fs_vfs_follow_link,
1293 .put_link = v9fs_vfs_put_link,
1294 .getattr = v9fs_vfs_getattr,
1295 .setattr = v9fs_vfs_setattr,
1298 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1299 .readlink = generic_readlink,
1300 .follow_link = v9fs_vfs_follow_link,
1301 .put_link = v9fs_vfs_put_link,
1302 .getattr = v9fs_vfs_getattr,
1303 .setattr = v9fs_vfs_setattr,