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 const struct inode_operations v9fs_dir_inode_operations;
45 static const struct inode_operations v9fs_dir_inode_operations_ext;
46 static const struct inode_operations v9fs_file_inode_operations;
47 static const 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;
209 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
210 inode->i_mapping->a_ops = &v9fs_addr_operations;
212 switch (mode & S_IFMT) {
217 if(!v9ses->extended) {
218 dprintk(DEBUG_ERROR, "special files without extended mode\n");
219 return ERR_PTR(-EINVAL);
221 init_special_inode(inode, inode->i_mode,
225 inode->i_op = &v9fs_file_inode_operations;
226 inode->i_fop = &v9fs_file_operations;
229 if(!v9ses->extended) {
230 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
231 return ERR_PTR(-EINVAL);
233 inode->i_op = &v9fs_symlink_inode_operations;
238 inode->i_op = &v9fs_dir_inode_operations_ext;
240 inode->i_op = &v9fs_dir_inode_operations;
241 inode->i_fop = &v9fs_dir_operations;
244 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
245 mode, mode & S_IFMT);
246 return ERR_PTR(-EINVAL);
249 eprintk(KERN_WARNING, "Problem allocating inode\n");
250 return ERR_PTR(-ENOMEM);
256 v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
257 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
261 struct v9fs_fcall *fcall;
263 fid = v9fs_get_idpool(&v9ses->fidpool);
265 eprintk(KERN_WARNING, "no free fids available\n");
269 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
271 PRINT_FCALL_ERROR("clone error", fcall);
272 if (fcall && fcall->id == RWALK)
279 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
281 PRINT_FCALL_ERROR("create fails", fcall);
286 *iounit = fcall->params.rcreate.iounit;
289 *qid = fcall->params.rcreate.qid;
298 v9fs_t_clunk(v9ses, fid);
302 if (fid != V9FS_NOFID)
303 v9fs_put_idpool(fid, &v9ses->fidpool);
309 static struct v9fs_fid*
310 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
314 struct v9fs_fid *ret;
315 struct v9fs_fcall *fcall;
317 nfid = v9fs_get_idpool(&v9ses->fidpool);
319 eprintk(KERN_WARNING, "no free fids available\n");
320 return ERR_PTR(-ENOSPC);
323 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
327 if (fcall && fcall->id == RWALK)
330 PRINT_FCALL_ERROR("walk error", fcall);
331 v9fs_put_idpool(nfid, &v9ses->fidpool);
337 ret = v9fs_fid_create(v9ses, nfid);
343 err = v9fs_fid_insert(ret, dentry);
345 v9fs_fid_destroy(ret);
352 v9fs_t_clunk(v9ses, nfid);
359 static struct inode *
360 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
361 struct super_block *sb)
365 struct v9fs_fcall *fcall;
368 err = v9fs_t_stat(v9ses, fid, &fcall);
370 PRINT_FCALL_ERROR("stat error", fcall);
374 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
375 ret = v9fs_get_inode(sb, umode);
382 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
395 * v9fs_remove - helper function to remove files and directories
396 * @dir: directory inode that is being deleted
397 * @file: dentry that is being deleted
398 * @rmdir: removing a directory
402 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
404 struct v9fs_fcall *fcall = NULL;
405 struct super_block *sb = NULL;
406 struct v9fs_session_info *v9ses = NULL;
407 struct v9fs_fid *v9fid = NULL;
408 struct inode *file_inode = NULL;
412 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
415 file_inode = file->d_inode;
416 sb = file_inode->i_sb;
417 v9ses = v9fs_inode2v9ses(file_inode);
418 v9fid = v9fs_fid_lookup(file);
420 return PTR_ERR(v9fid);
424 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
429 result = v9fs_t_remove(v9ses, fid, &fcall);
431 PRINT_FCALL_ERROR("remove fails", fcall);
435 v9fs_put_idpool(fid, &v9ses->fidpool);
436 v9fs_fid_destroy(v9fid);
444 v9fs_open_created(struct inode *inode, struct file *file)
450 * v9fs_vfs_create - VFS hook to create files
451 * @inode: directory inode that is being deleted
452 * @dentry: dentry that is being deleted
453 * @mode: create permissions
454 * @nd: path information
459 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
460 struct nameidata *nd)
463 u32 fid, perm, iounit;
465 struct v9fs_session_info *v9ses;
466 struct v9fs_fid *dfid, *vfid, *ffid;
473 v9ses = v9fs_inode2v9ses(dir);
474 dfid = v9fs_fid_clone(dentry->d_parent);
480 perm = unixmode2p9mode(v9ses, mode);
481 if (nd && nd->flags & LOOKUP_OPEN)
482 flags = nd->intent.open.flags - 1;
486 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
487 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
492 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
493 v9fs_fid_clunk(v9ses, dfid);
500 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
502 err = PTR_ERR(inode);
507 dentry->d_op = &v9fs_dentry_operations;
508 d_instantiate(dentry, inode);
510 if (nd && nd->flags & LOOKUP_OPEN) {
511 ffid = v9fs_fid_create(v9ses, fid);
515 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
517 v9fs_fid_destroy(ffid);
518 return PTR_ERR(filp);
522 ffid->rdir_fcall = NULL;
524 ffid->iounit = iounit;
526 filp->private_data = ffid;
532 v9fs_fid_clunk(v9ses, dfid);
536 v9fs_fid_destroy(vfid);
542 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
543 * @inode: inode that is being unlinked
544 * @dentry: dentry that is being unlinked
545 * @mode: mode for new directory
549 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
553 struct v9fs_session_info *v9ses;
554 struct v9fs_fid *dfid, *vfid;
559 v9ses = v9fs_inode2v9ses(dir);
560 dfid = v9fs_fid_clone(dentry->d_parent);
566 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
568 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
569 perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
572 dprintk(DEBUG_ERROR, "create error %d\n", err);
576 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
583 v9fs_fid_clunk(v9ses, dfid);
584 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
586 err = PTR_ERR(inode);
588 v9fs_fid_destroy(vfid);
592 dentry->d_op = &v9fs_dentry_operations;
593 d_instantiate(dentry, inode);
597 v9fs_fid_clunk(v9ses, dfid);
604 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
605 * @dir: inode that is being walked from
606 * @dentry: dentry that is being walked to?
607 * @nameidata: path data
611 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
612 struct nameidata *nameidata)
614 struct super_block *sb;
615 struct v9fs_session_info *v9ses;
616 struct v9fs_fid *dirfid;
617 struct v9fs_fid *fid;
619 struct v9fs_fcall *fcall = NULL;
624 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
625 dir, dentry->d_name.name, dentry, nameidata);
628 v9ses = v9fs_inode2v9ses(dir);
629 dentry->d_op = &v9fs_dentry_operations;
630 dirfid = v9fs_fid_lookup(dentry->d_parent);
633 return ERR_PTR(PTR_ERR(dirfid));
635 dirfidnum = dirfid->fid;
637 newfid = v9fs_get_idpool(&v9ses->fidpool);
639 eprintk(KERN_WARNING, "newfid fails!\n");
644 result = v9fs_t_walk(v9ses, dirfidnum, newfid,
645 (char *)dentry->d_name.name, &fcall);
650 if (fcall && fcall->id == RWALK)
651 v9fs_t_clunk(v9ses, newfid);
653 v9fs_put_idpool(newfid, &v9ses->fidpool);
655 if (result == -ENOENT) {
658 "Return negative dentry %p count %d\n",
659 dentry, atomic_read(&dentry->d_count));
663 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
668 result = v9fs_t_stat(v9ses, newfid, &fcall);
670 dprintk(DEBUG_ERROR, "stat error\n");
674 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
675 fcall->params.rstat.stat.mode));
677 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
678 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
685 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
687 fid = v9fs_fid_create(v9ses, newfid);
689 dprintk(DEBUG_ERROR, "couldn't insert\n");
694 result = v9fs_fid_insert(fid, dentry);
698 fid->qid = fcall->params.rstat.stat.qid;
699 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
701 d_add(dentry, inode);
712 return ERR_PTR(result);
716 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
717 * @i: inode that is being unlinked
718 * @d: dentry that is being unlinked
722 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
724 return v9fs_remove(i, d, 0);
728 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
729 * @i: inode that is being unlinked
730 * @d: dentry that is being unlinked
734 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
736 return v9fs_remove(i, d, 1);
740 * v9fs_vfs_rename - VFS hook to rename an inode
741 * @old_dir: old dir inode
742 * @old_dentry: old dentry
743 * @new_dir: new dir inode
744 * @new_dentry: new dentry
749 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
750 struct inode *new_dir, struct dentry *new_dentry)
752 struct inode *old_inode = old_dentry->d_inode;
753 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
754 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
755 struct v9fs_fid *olddirfid;
756 struct v9fs_fid *newdirfid;
757 struct v9fs_wstat wstat;
758 struct v9fs_fcall *fcall = NULL;
760 int olddirfidnum = -1;
761 int newdirfidnum = -1;
764 dprintk(DEBUG_VFS, "\n");
767 return PTR_ERR(oldfid);
769 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
770 if(IS_ERR(olddirfid)) {
771 retval = PTR_ERR(olddirfid);
775 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
776 if(IS_ERR(newdirfid)) {
777 retval = PTR_ERR(newdirfid);
781 /* 9P can only handle file rename in the same directory */
782 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
783 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
789 olddirfidnum = olddirfid->fid;
790 newdirfidnum = newdirfid->fid;
793 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
799 v9fs_blank_wstat(&wstat);
800 wstat.muid = v9ses->name;
801 wstat.name = (char *) new_dentry->d_name.name;
803 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
806 PRINT_FCALL_ERROR("wstat error", fcall);
811 v9fs_fid_clunk(v9ses, newdirfid);
814 v9fs_fid_clunk(v9ses, olddirfid);
823 * v9fs_vfs_getattr - retrieve file metadata
824 * @mnt - mount information
825 * @dentry - file to get attributes on
826 * @stat - metadata structure to populate
831 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
834 struct v9fs_fcall *fcall = NULL;
835 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
836 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
839 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
843 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
846 dprintk(DEBUG_ERROR, "stat error\n");
848 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
849 dentry->d_inode->i_sb);
850 generic_fillattr(dentry->d_inode, stat);
854 v9fs_fid_clunk(v9ses, fid);
859 * v9fs_vfs_setattr - set file metadata
860 * @dentry: file whose metadata to set
861 * @iattr: metadata assignment structure
865 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
867 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
868 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
869 struct v9fs_fcall *fcall = NULL;
870 struct v9fs_wstat wstat;
873 dprintk(DEBUG_VFS, "\n");
877 v9fs_blank_wstat(&wstat);
878 if (iattr->ia_valid & ATTR_MODE)
879 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
881 if (iattr->ia_valid & ATTR_MTIME)
882 wstat.mtime = iattr->ia_mtime.tv_sec;
884 if (iattr->ia_valid & ATTR_ATIME)
885 wstat.atime = iattr->ia_atime.tv_sec;
887 if (iattr->ia_valid & ATTR_SIZE)
888 wstat.length = iattr->ia_size;
890 if (v9ses->extended) {
891 if (iattr->ia_valid & ATTR_UID)
892 wstat.n_uid = iattr->ia_uid;
894 if (iattr->ia_valid & ATTR_GID)
895 wstat.n_gid = iattr->ia_gid;
898 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
901 PRINT_FCALL_ERROR("wstat error", fcall);
905 res = inode_setattr(dentry->d_inode, iattr);
907 v9fs_fid_clunk(v9ses, fid);
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 v9fs_stat *stat, struct inode *inode,
921 struct super_block *sb)
925 struct v9fs_session_info *v9ses = sb->s_fs_info;
929 inode->i_atime.tv_sec = stat->atime;
930 inode->i_mtime.tv_sec = stat->mtime;
931 inode->i_ctime.tv_sec = stat->mtime;
933 inode->i_uid = v9ses->uid;
934 inode->i_gid = v9ses->gid;
936 if (v9ses->extended) {
937 inode->i_uid = stat->n_uid;
938 inode->i_gid = stat->n_gid;
941 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
942 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
947 n = stat->extension.len;
948 if (n > sizeof(ext)-1)
950 memmove(ext, stat->extension.str, n);
952 sscanf(ext, "%c %u %u", &type, &major, &minor);
955 inode->i_mode &= ~S_IFBLK;
956 inode->i_mode |= S_IFCHR;
961 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
962 type, stat->extension.len, stat->extension.str);
964 inode->i_rdev = MKDEV(major, minor);
968 inode->i_size = stat->length;
971 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
975 * v9fs_qid2ino - convert qid into inode number
978 * BUG: potential for inode number collisions?
981 ino_t v9fs_qid2ino(struct v9fs_qid *qid)
983 u64 path = qid->path + 2;
986 if (sizeof(ino_t) == sizeof(path))
987 memcpy(&i, &path, sizeof(ino_t));
989 i = (ino_t) (path ^ (path >> 32));
995 * v9fs_readlink - read a symlink's location (internal version)
996 * @dentry: dentry for symlink
997 * @buffer: buffer to load symlink location into
998 * @buflen: length of buffer
1002 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1004 int retval = -EPERM;
1006 struct v9fs_fcall *fcall = NULL;
1007 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
1008 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
1011 return PTR_ERR(fid);
1013 if (!v9ses->extended) {
1015 dprintk(DEBUG_ERROR, "not extended\n");
1019 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1020 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1023 dprintk(DEBUG_ERROR, "stat error\n");
1032 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
1037 /* copy extension buffer into buffer */
1038 if (fcall->params.rstat.stat.extension.len < buflen)
1039 buflen = fcall->params.rstat.stat.extension.len + 1;
1041 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
1042 buffer[buflen-1] = 0;
1044 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
1045 fcall->params.rstat.stat.extension.str, buffer);
1052 v9fs_fid_clunk(v9ses, fid);
1058 * v9fs_vfs_readlink - read a symlink's location
1059 * @dentry: dentry for symlink
1060 * @buf: buffer to load symlink location into
1061 * @buflen: length of buffer
1065 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1070 char *link = __getname();
1072 if (unlikely(!link))
1075 if (buflen > PATH_MAX)
1078 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1080 retval = v9fs_readlink(dentry, link, buflen);
1083 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1084 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1095 * v9fs_vfs_follow_link - follow a symlink path
1096 * @dentry: dentry for symlink
1101 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1104 char *link = __getname();
1106 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1109 link = ERR_PTR(-ENOMEM);
1111 len = v9fs_readlink(dentry, link, PATH_MAX);
1115 link = ERR_PTR(len);
1119 nd_set_link(nd, link);
1125 * v9fs_vfs_put_link - release a symlink path
1126 * @dentry: dentry for symlink
1131 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1133 char *s = nd_get_link(nd);
1135 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1140 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1141 int mode, const char *extension)
1145 struct v9fs_session_info *v9ses;
1146 struct v9fs_fid *dfid, *vfid = NULL;
1147 struct inode *inode = NULL;
1149 v9ses = v9fs_inode2v9ses(dir);
1150 if (!v9ses->extended) {
1151 dprintk(DEBUG_ERROR, "not extended\n");
1155 dfid = v9fs_fid_clone(dentry->d_parent);
1157 err = PTR_ERR(dfid);
1161 perm = unixmode2p9mode(v9ses, mode);
1163 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
1164 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
1169 err = v9fs_t_clunk(v9ses, fid);
1173 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
1175 err = PTR_ERR(vfid);
1180 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
1181 if (IS_ERR(inode)) {
1182 err = PTR_ERR(inode);
1187 dentry->d_op = &v9fs_dentry_operations;
1188 d_instantiate(dentry, inode);
1192 v9fs_fid_destroy(vfid);
1195 v9fs_fid_clunk(v9ses, dfid);
1203 * v9fs_vfs_symlink - helper function to create symlinks
1204 * @dir: directory inode containing symlink
1205 * @dentry: dentry for symlink
1206 * @symname: symlink data
1208 * See 9P2000.u RFC for more information
1213 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1215 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1218 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1222 * v9fs_vfs_link - create a hardlink
1223 * @old_dentry: dentry for file to link to
1224 * @dir: inode destination for new link
1225 * @dentry: dentry for link
1229 /* XXX - lots of code dup'd from symlink and creates,
1230 * figure out a better reuse strategy
1234 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1235 struct dentry *dentry)
1238 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1239 struct v9fs_fid *oldfid;
1242 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1243 old_dentry->d_name.name);
1245 oldfid = v9fs_fid_clone(old_dentry);
1247 return PTR_ERR(oldfid);
1250 if (unlikely(!name)) {
1255 sprintf(name, "%d\n", oldfid->fid);
1256 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
1260 v9fs_fid_clunk(v9ses, oldfid);
1265 * v9fs_vfs_mknod - create a special file
1266 * @dir: inode destination for new link
1267 * @dentry: dentry for file
1268 * @mode: mode for creation
1269 * @dev_t: device associated with special file
1274 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1279 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1280 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1282 if (!new_valid_dev(rdev))
1288 /* build extension */
1290 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1291 else if (S_ISCHR(mode))
1292 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1293 else if (S_ISFIFO(mode))
1300 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1306 static const struct inode_operations v9fs_dir_inode_operations_ext = {
1307 .create = v9fs_vfs_create,
1308 .lookup = v9fs_vfs_lookup,
1309 .symlink = v9fs_vfs_symlink,
1310 .link = v9fs_vfs_link,
1311 .unlink = v9fs_vfs_unlink,
1312 .mkdir = v9fs_vfs_mkdir,
1313 .rmdir = v9fs_vfs_rmdir,
1314 .mknod = v9fs_vfs_mknod,
1315 .rename = v9fs_vfs_rename,
1316 .readlink = v9fs_vfs_readlink,
1317 .getattr = v9fs_vfs_getattr,
1318 .setattr = v9fs_vfs_setattr,
1321 static const struct inode_operations v9fs_dir_inode_operations = {
1322 .create = v9fs_vfs_create,
1323 .lookup = v9fs_vfs_lookup,
1324 .unlink = v9fs_vfs_unlink,
1325 .mkdir = v9fs_vfs_mkdir,
1326 .rmdir = v9fs_vfs_rmdir,
1327 .mknod = v9fs_vfs_mknod,
1328 .rename = v9fs_vfs_rename,
1329 .getattr = v9fs_vfs_getattr,
1330 .setattr = v9fs_vfs_setattr,
1333 static const struct inode_operations v9fs_file_inode_operations = {
1334 .getattr = v9fs_vfs_getattr,
1335 .setattr = v9fs_vfs_setattr,
1338 static const struct inode_operations v9fs_symlink_inode_operations = {
1339 .readlink = v9fs_vfs_readlink,
1340 .follow_link = v9fs_vfs_follow_link,
1341 .put_link = v9fs_vfs_put_link,
1342 .getattr = v9fs_vfs_getattr,
1343 .setattr = v9fs_vfs_setattr,