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/smp_lock.h>
34 #include <linux/inet.h>
35 #include <linux/namei.h>
36 #include <linux/idr.h>
44 static struct inode_operations v9fs_dir_inode_operations;
45 static struct inode_operations v9fs_dir_inode_operations_ext;
46 static struct inode_operations v9fs_file_inode_operations;
47 static struct inode_operations v9fs_symlink_inode_operations;
50 * unixmode2p9mode - convert unix mode bits to plan 9
51 * @v9ses: v9fs session information
52 * @mode: mode to convert
56 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
62 if (v9ses->extended) {
64 res |= V9FS_DMSYMLINK;
65 if (v9ses->nodev == 0) {
69 res |= V9FS_DMNAMEDPIPE;
76 if ((mode & S_ISUID) == S_ISUID)
78 if ((mode & S_ISGID) == S_ISGID)
80 if ((mode & V9FS_DMLINK))
88 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
89 * @v9ses: v9fs session information
90 * @mode: mode to convert
94 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
100 if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
102 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
104 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
105 && (v9ses->nodev == 0))
107 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
108 && (v9ses->nodev == 0))
110 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
111 && (v9ses->nodev == 0))
116 if (v9ses->extended) {
117 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
120 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
127 int v9fs_uflags2omode(int uflags)
150 if (uflags & O_TRUNC)
153 if (uflags & O_APPEND)
160 * v9fs_blank_wstat - helper function to setup a 9P stat structure
161 * @v9ses: 9P session info (for determining extended mode)
162 * @wstat: structure to initialize
167 v9fs_blank_wstat(struct v9fs_wstat *wstat)
171 wstat->qid.type = ~0;
172 wstat->qid.version = ~0;
173 *((long long *)&wstat->qid.path) = ~0;
185 wstat->extension = NULL;
189 * v9fs_get_inode - helper function to setup an inode
191 * @mode: mode to setup inode with
195 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
198 struct v9fs_session_info *v9ses = sb->s_fs_info;
200 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
202 inode = new_inode(sb);
204 inode->i_mode = mode;
205 inode->i_uid = current->fsuid;
206 inode->i_gid = current->fsgid;
207 inode->i_blksize = sb->s_blocksize;
210 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
211 inode->i_mapping->a_ops = &v9fs_addr_operations;
213 switch (mode & S_IFMT) {
218 if(!v9ses->extended) {
219 dprintk(DEBUG_ERROR, "special files without extended mode\n");
220 return ERR_PTR(-EINVAL);
222 init_special_inode(inode, inode->i_mode,
226 inode->i_op = &v9fs_file_inode_operations;
227 inode->i_fop = &v9fs_file_operations;
230 if(!v9ses->extended) {
231 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
232 return ERR_PTR(-EINVAL);
234 inode->i_op = &v9fs_symlink_inode_operations;
239 inode->i_op = &v9fs_dir_inode_operations_ext;
241 inode->i_op = &v9fs_dir_inode_operations;
242 inode->i_fop = &v9fs_dir_operations;
245 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
246 mode, mode & S_IFMT);
247 return ERR_PTR(-EINVAL);
250 eprintk(KERN_WARNING, "Problem allocating inode\n");
251 return ERR_PTR(-ENOMEM);
257 v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
258 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
262 struct v9fs_fcall *fcall;
264 fid = v9fs_get_idpool(&v9ses->fidpool);
266 eprintk(KERN_WARNING, "no free fids available\n");
270 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
272 PRINT_FCALL_ERROR("clone error", fcall);
273 if (fcall && fcall->id == RWALK)
280 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
282 PRINT_FCALL_ERROR("create fails", fcall);
287 *iounit = fcall->params.rcreate.iounit;
290 *qid = fcall->params.rcreate.qid;
299 v9fs_t_clunk(v9ses, fid);
304 v9fs_put_idpool(fid, &v9ses->fidpool);
310 static struct v9fs_fid*
311 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
315 struct v9fs_fid *ret;
316 struct v9fs_fcall *fcall;
318 nfid = v9fs_get_idpool(&v9ses->fidpool);
320 eprintk(KERN_WARNING, "no free fids available\n");
321 return ERR_PTR(-ENOSPC);
324 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
328 if (fcall && fcall->id == RWALK)
331 PRINT_FCALL_ERROR("walk error", fcall);
332 v9fs_put_idpool(nfid, &v9ses->fidpool);
338 ret = v9fs_fid_create(v9ses, nfid);
344 err = v9fs_fid_insert(ret, dentry);
346 v9fs_fid_destroy(ret);
353 v9fs_t_clunk(v9ses, nfid);
360 static struct inode *
361 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
362 struct super_block *sb)
366 struct v9fs_fcall *fcall;
369 err = v9fs_t_stat(v9ses, fid, &fcall);
371 PRINT_FCALL_ERROR("stat error", fcall);
375 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
376 ret = v9fs_get_inode(sb, umode);
383 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
396 * v9fs_remove - helper function to remove files and directories
397 * @dir: directory inode that is being deleted
398 * @file: dentry that is being deleted
399 * @rmdir: removing a directory
403 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
405 struct v9fs_fcall *fcall = NULL;
406 struct super_block *sb = NULL;
407 struct v9fs_session_info *v9ses = NULL;
408 struct v9fs_fid *v9fid = NULL;
409 struct inode *file_inode = NULL;
413 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
416 file_inode = file->d_inode;
417 sb = file_inode->i_sb;
418 v9ses = v9fs_inode2v9ses(file_inode);
419 v9fid = v9fs_fid_lookup(file);
429 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
434 result = v9fs_t_remove(v9ses, fid, &fcall);
436 PRINT_FCALL_ERROR("remove fails", fcall);
438 v9fs_put_idpool(fid, &v9ses->fidpool);
439 v9fs_fid_destroy(v9fid);
447 v9fs_open_created(struct inode *inode, struct file *file)
453 * v9fs_vfs_create - VFS hook to create files
454 * @inode: directory inode that is being deleted
455 * @dentry: dentry that is being deleted
456 * @mode: create permissions
457 * @nd: path information
462 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
463 struct nameidata *nd)
466 u32 fid, perm, iounit;
468 struct v9fs_session_info *v9ses;
469 struct v9fs_fid *dfid, *vfid, *ffid;
476 v9ses = v9fs_inode2v9ses(dir);
477 dfid = v9fs_fid_lookup(dentry->d_parent);
478 perm = unixmode2p9mode(v9ses, mode);
480 if (nd && nd->flags & LOOKUP_OPEN)
481 flags = nd->intent.open.flags - 1;
485 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
486 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
491 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
498 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
500 err = PTR_ERR(inode);
505 dentry->d_op = &v9fs_dentry_operations;
506 d_instantiate(dentry, inode);
508 if (nd && nd->flags & LOOKUP_OPEN) {
509 ffid = v9fs_fid_create(v9ses, fid);
513 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
515 v9fs_fid_destroy(ffid);
516 return PTR_ERR(filp);
520 ffid->rdir_fcall = NULL;
522 ffid->iounit = iounit;
524 filp->private_data = ffid;
531 v9fs_fid_destroy(vfid);
540 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
541 * @inode: inode that is being unlinked
542 * @dentry: dentry that is being unlinked
543 * @mode: mode for new directory
547 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
551 struct v9fs_session_info *v9ses;
552 struct v9fs_fid *dfid, *vfid;
557 v9ses = v9fs_inode2v9ses(dir);
558 dfid = v9fs_fid_lookup(dentry->d_parent);
559 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
561 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
562 perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
565 dprintk(DEBUG_ERROR, "create error %d\n", err);
569 err = v9fs_t_clunk(v9ses, fid);
571 dprintk(DEBUG_ERROR, "clunk error %d\n", err);
575 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
582 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
584 err = PTR_ERR(inode);
589 dentry->d_op = &v9fs_dentry_operations;
590 d_instantiate(dentry, inode);
595 v9fs_fid_destroy(vfid);
601 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
602 * @dir: inode that is being walked from
603 * @dentry: dentry that is being walked to?
604 * @nameidata: path data
608 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
609 struct nameidata *nameidata)
611 struct super_block *sb;
612 struct v9fs_session_info *v9ses;
613 struct v9fs_fid *dirfid;
614 struct v9fs_fid *fid;
616 struct v9fs_fcall *fcall = NULL;
621 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
622 dir, dentry->d_name.name, dentry, nameidata);
625 v9ses = v9fs_inode2v9ses(dir);
626 dentry->d_op = &v9fs_dentry_operations;
627 dirfid = v9fs_fid_lookup(dentry->d_parent);
630 dprintk(DEBUG_ERROR, "no dirfid\n");
631 return ERR_PTR(-EINVAL);
634 dirfidnum = dirfid->fid;
637 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
639 return ERR_PTR(-EBADF);
642 newfid = v9fs_get_idpool(&v9ses->fidpool);
644 eprintk(KERN_WARNING, "newfid fails!\n");
645 return ERR_PTR(-ENOSPC);
648 result = v9fs_t_walk(v9ses, dirfidnum, newfid,
649 (char *)dentry->d_name.name, &fcall);
652 if (fcall && fcall->id == RWALK)
653 v9fs_t_clunk(v9ses, newfid);
655 v9fs_put_idpool(newfid, &v9ses->fidpool);
657 if (result == -ENOENT) {
660 "Return negative dentry %p count %d\n",
661 dentry, atomic_read(&dentry->d_count));
665 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
670 result = v9fs_t_stat(v9ses, newfid, &fcall);
672 dprintk(DEBUG_ERROR, "stat error\n");
676 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
677 fcall->params.rstat.stat.mode));
679 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
680 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
687 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
689 fid = v9fs_fid_create(v9ses, newfid);
691 dprintk(DEBUG_ERROR, "couldn't insert\n");
696 result = v9fs_fid_insert(fid, dentry);
700 fid->qid = fcall->params.rstat.stat.qid;
701 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
703 d_add(dentry, inode);
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 static 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 static 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 = old_dentry->d_inode;
751 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
752 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
753 struct v9fs_fid *olddirfid =
754 v9fs_fid_lookup(old_dentry->d_parent);
755 struct v9fs_fid *newdirfid =
756 v9fs_fid_lookup(new_dentry->d_parent);
757 struct v9fs_wstat wstat;
758 struct v9fs_fcall *fcall = NULL;
760 int olddirfidnum = -1;
761 int newdirfidnum = -1;
764 dprintk(DEBUG_VFS, "\n");
766 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
767 dprintk(DEBUG_ERROR, "problem with arguments\n");
771 /* 9P can only handle file rename in the same directory */
772 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
773 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
779 olddirfidnum = olddirfid->fid;
780 newdirfidnum = newdirfid->fid;
783 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
789 v9fs_blank_wstat(&wstat);
790 wstat.muid = v9ses->name;
791 wstat.name = (char *) new_dentry->d_name.name;
793 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
797 PRINT_FCALL_ERROR("wstat error", fcall);
804 * v9fs_vfs_getattr - retrieve file metadata
805 * @mnt - mount information
806 * @dentry - file to get attributes on
807 * @stat - metadata structure to populate
812 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
815 struct v9fs_fcall *fcall = NULL;
816 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
817 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
820 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
823 "couldn't find fid associated with dentry\n");
827 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
830 dprintk(DEBUG_ERROR, "stat error\n");
832 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
833 dentry->d_inode->i_sb);
834 generic_fillattr(dentry->d_inode, stat);
842 * v9fs_vfs_setattr - set file metadata
843 * @dentry: file whose metadata to set
844 * @iattr: metadata assignment structure
848 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
850 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
851 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
852 struct v9fs_fcall *fcall = NULL;
853 struct v9fs_wstat wstat;
856 dprintk(DEBUG_VFS, "\n");
860 "Couldn't find fid associated with dentry\n");
864 v9fs_blank_wstat(&wstat);
865 if (iattr->ia_valid & ATTR_MODE)
866 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
868 if (iattr->ia_valid & ATTR_MTIME)
869 wstat.mtime = iattr->ia_mtime.tv_sec;
871 if (iattr->ia_valid & ATTR_ATIME)
872 wstat.atime = iattr->ia_atime.tv_sec;
874 if (iattr->ia_valid & ATTR_SIZE)
875 wstat.length = iattr->ia_size;
877 if (v9ses->extended) {
878 if (iattr->ia_valid & ATTR_UID)
879 wstat.n_uid = iattr->ia_uid;
881 if (iattr->ia_valid & ATTR_GID)
882 wstat.n_gid = iattr->ia_gid;
885 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
888 PRINT_FCALL_ERROR("wstat error", fcall);
892 res = inode_setattr(dentry->d_inode, iattr);
898 * v9fs_stat2inode - populate an inode structure with mistat info
899 * @stat: Plan 9 metadata (mistat) structure
900 * @inode: inode to populate
901 * @sb: superblock of filesystem
906 v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
907 struct super_block *sb)
911 struct v9fs_session_info *v9ses = sb->s_fs_info;
915 inode->i_atime.tv_sec = stat->atime;
916 inode->i_mtime.tv_sec = stat->mtime;
917 inode->i_ctime.tv_sec = stat->mtime;
919 inode->i_uid = v9ses->uid;
920 inode->i_gid = v9ses->gid;
922 if (v9ses->extended) {
923 inode->i_uid = stat->n_uid;
924 inode->i_gid = stat->n_gid;
927 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
928 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
933 n = stat->extension.len;
934 if (n > sizeof(ext)-1)
936 memmove(ext, stat->extension.str, n);
938 sscanf(ext, "%c %u %u", &type, &major, &minor);
941 inode->i_mode &= ~S_IFBLK;
942 inode->i_mode |= S_IFCHR;
947 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
948 type, stat->extension.len, stat->extension.str);
950 inode->i_rdev = MKDEV(major, minor);
954 inode->i_size = stat->length;
956 inode->i_blksize = sb->s_blocksize;
958 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
962 * v9fs_qid2ino - convert qid into inode number
965 * BUG: potential for inode number collisions?
968 ino_t v9fs_qid2ino(struct v9fs_qid *qid)
970 u64 path = qid->path + 2;
973 if (sizeof(ino_t) == sizeof(path))
974 memcpy(&i, &path, sizeof(ino_t));
976 i = (ino_t) (path ^ (path >> 32));
982 * v9fs_readlink - read a symlink's location (internal version)
983 * @dentry: dentry for symlink
984 * @buffer: buffer to load symlink location into
985 * @buflen: length of buffer
989 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
993 struct v9fs_fcall *fcall = NULL;
994 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
995 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
998 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1003 if (!v9ses->extended) {
1005 dprintk(DEBUG_ERROR, "not extended\n");
1009 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1010 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1013 dprintk(DEBUG_ERROR, "stat error\n");
1020 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
1025 /* copy extension buffer into buffer */
1026 if (fcall->params.rstat.stat.extension.len < buflen)
1027 buflen = fcall->params.rstat.stat.extension.len + 1;
1029 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
1030 buffer[buflen-1] = 0;
1032 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
1033 fcall->params.rstat.stat.extension.str, buffer);
1043 * v9fs_vfs_readlink - read a symlink's location
1044 * @dentry: dentry for symlink
1045 * @buf: buffer to load symlink location into
1046 * @buflen: length of buffer
1050 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1055 char *link = __getname();
1057 if (buflen > PATH_MAX)
1060 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1062 retval = v9fs_readlink(dentry, link, buflen);
1065 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1066 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1077 * v9fs_vfs_follow_link - follow a symlink path
1078 * @dentry: dentry for symlink
1083 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1086 char *link = __getname();
1088 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1091 link = ERR_PTR(-ENOMEM);
1093 len = v9fs_readlink(dentry, link, PATH_MAX);
1097 link = ERR_PTR(len);
1101 nd_set_link(nd, link);
1107 * v9fs_vfs_put_link - release a symlink path
1108 * @dentry: dentry for symlink
1113 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1115 char *s = nd_get_link(nd);
1117 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1122 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1123 int mode, const char *extension)
1127 struct v9fs_session_info *v9ses;
1128 struct v9fs_fid *dfid, *vfid;
1129 struct inode *inode;
1133 v9ses = v9fs_inode2v9ses(dir);
1134 dfid = v9fs_fid_lookup(dentry->d_parent);
1135 perm = unixmode2p9mode(v9ses, mode);
1137 if (!v9ses->extended) {
1138 dprintk(DEBUG_ERROR, "not extended\n");
1142 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
1143 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
1148 err = v9fs_t_clunk(v9ses, fid);
1152 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
1154 err = PTR_ERR(vfid);
1159 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
1160 if (IS_ERR(inode)) {
1161 err = PTR_ERR(inode);
1166 dentry->d_op = &v9fs_dentry_operations;
1167 d_instantiate(dentry, inode);
1172 v9fs_fid_destroy(vfid);
1182 * v9fs_vfs_symlink - helper function to create symlinks
1183 * @dir: directory inode containing symlink
1184 * @dentry: dentry for symlink
1185 * @symname: symlink data
1187 * See 9P2000.u RFC for more information
1192 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1194 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1197 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1201 * v9fs_vfs_link - create a hardlink
1202 * @old_dentry: dentry for file to link to
1203 * @dir: inode destination for new link
1204 * @dentry: dentry for link
1208 /* XXX - lots of code dup'd from symlink and creates,
1209 * figure out a better reuse strategy
1213 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1214 struct dentry *dentry)
1217 struct v9fs_fid *oldfid;
1220 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1221 old_dentry->d_name.name);
1223 oldfid = v9fs_fid_lookup(old_dentry);
1225 dprintk(DEBUG_ERROR, "can't find oldfid\n");
1230 sprintf(name, "%d\n", oldfid->fid);
1231 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
1238 * v9fs_vfs_mknod - create a special file
1239 * @dir: inode destination for new link
1240 * @dentry: dentry for file
1241 * @mode: mode for creation
1242 * @dev_t: device associated with special file
1247 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1252 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1253 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1255 if (!new_valid_dev(rdev))
1261 /* build extension */
1263 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1264 else if (S_ISCHR(mode))
1265 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1266 else if (S_ISFIFO(mode))
1273 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1279 static struct inode_operations v9fs_dir_inode_operations_ext = {
1280 .create = v9fs_vfs_create,
1281 .lookup = v9fs_vfs_lookup,
1282 .symlink = v9fs_vfs_symlink,
1283 .link = v9fs_vfs_link,
1284 .unlink = v9fs_vfs_unlink,
1285 .mkdir = v9fs_vfs_mkdir,
1286 .rmdir = v9fs_vfs_rmdir,
1287 .mknod = v9fs_vfs_mknod,
1288 .rename = v9fs_vfs_rename,
1289 .readlink = v9fs_vfs_readlink,
1290 .getattr = v9fs_vfs_getattr,
1291 .setattr = v9fs_vfs_setattr,
1294 static struct inode_operations v9fs_dir_inode_operations = {
1295 .create = v9fs_vfs_create,
1296 .lookup = v9fs_vfs_lookup,
1297 .unlink = v9fs_vfs_unlink,
1298 .mkdir = v9fs_vfs_mkdir,
1299 .rmdir = v9fs_vfs_rmdir,
1300 .mknod = v9fs_vfs_mknod,
1301 .rename = v9fs_vfs_rename,
1302 .getattr = v9fs_vfs_getattr,
1303 .setattr = v9fs_vfs_setattr,
1306 static struct inode_operations v9fs_file_inode_operations = {
1307 .getattr = v9fs_vfs_getattr,
1308 .setattr = v9fs_vfs_setattr,
1311 static struct inode_operations v9fs_symlink_inode_operations = {
1312 .readlink = v9fs_vfs_readlink,
1313 .follow_link = v9fs_vfs_follow_link,
1314 .put_link = v9fs_vfs_put_link,
1315 .getattr = v9fs_vfs_getattr,
1316 .setattr = v9fs_vfs_setattr,