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_init_owner(inode, NULL, mode);
262 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
263 inode->i_mapping->a_ops = &v9fs_addr_operations;
265 switch (mode & S_IFMT) {
270 if (!v9fs_proto_dotu(v9ses)) {
271 P9_DPRINTK(P9_DEBUG_ERROR,
272 "special files without extended mode\n");
276 init_special_inode(inode, inode->i_mode, inode->i_rdev);
279 if (v9fs_proto_dotl(v9ses)) {
280 inode->i_op = &v9fs_file_inode_operations_dotl;
281 inode->i_fop = &v9fs_file_operations_dotl;
283 inode->i_op = &v9fs_file_inode_operations;
284 inode->i_fop = &v9fs_file_operations;
290 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
291 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
292 "legacy protocol.\n");
297 if (v9fs_proto_dotl(v9ses))
298 inode->i_op = &v9fs_symlink_inode_operations_dotl;
300 inode->i_op = &v9fs_symlink_inode_operations;
305 if (v9fs_proto_dotl(v9ses))
306 inode->i_op = &v9fs_dir_inode_operations_dotl;
307 else if (v9fs_proto_dotu(v9ses))
308 inode->i_op = &v9fs_dir_inode_operations_dotu;
310 inode->i_op = &v9fs_dir_inode_operations;
312 if (v9fs_proto_dotl(v9ses))
313 inode->i_fop = &v9fs_dir_operations_dotl;
315 inode->i_fop = &v9fs_dir_operations;
319 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
320 mode, mode & S_IFMT);
333 static struct v9fs_fid*
334 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
338 struct v9fs_fid *ret;
339 struct v9fs_fcall *fcall;
341 nfid = v9fs_get_idpool(&v9ses->fidpool);
343 eprintk(KERN_WARNING, "no free fids available\n");
344 return ERR_PTR(-ENOSPC);
347 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
351 if (fcall && fcall->id == RWALK)
354 PRINT_FCALL_ERROR("walk error", fcall);
355 v9fs_put_idpool(nfid, &v9ses->fidpool);
361 ret = v9fs_fid_create(v9ses, nfid);
367 err = v9fs_fid_insert(ret, dentry);
369 v9fs_fid_destroy(ret);
376 v9fs_t_clunk(v9ses, nfid);
386 * v9fs_clear_inode - release an inode
387 * @inode: inode to release
390 void v9fs_clear_inode(struct inode *inode)
392 filemap_fdatawrite(inode->i_mapping);
394 #ifdef CONFIG_9P_FSCACHE
395 v9fs_cache_inode_put_cookie(inode);
400 * v9fs_inode_from_fid - populate an inode by issuing a attribute request
401 * @v9ses: session information
402 * @fid: fid to issue attribute request for
403 * @sb: superblock on which to create inode
407 static struct inode *
408 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
409 struct super_block *sb)
416 st = p9_client_stat(fid);
420 umode = p9mode2unixmode(v9ses, st->mode);
421 ret = v9fs_get_inode(sb, umode);
427 v9fs_stat2inode(st, ret, sb);
428 ret->i_ino = v9fs_qid2ino(&st->qid);
430 #ifdef CONFIG_9P_FSCACHE
431 v9fs_vcookie_set_qid(ret, &st->qid);
432 v9fs_cache_inode_get_cookie(ret);
446 * v9fs_remove - helper function to remove files and directories
447 * @dir: directory inode that is being deleted
448 * @file: dentry that is being deleted
449 * @rmdir: removing a directory
453 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
456 struct inode *file_inode;
457 struct p9_fid *v9fid;
459 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
462 file_inode = file->d_inode;
463 v9fid = v9fs_fid_clone(file);
465 return PTR_ERR(v9fid);
467 retval = p9_client_remove(v9fid);
469 drop_nlink(file_inode);
474 v9fs_open_created(struct inode *inode, struct file *file)
481 * v9fs_create - Create a file
482 * @v9ses: session information
483 * @dir: directory that dentry is being created in
484 * @dentry: dentry that is being created
485 * @extension: 9p2000.u extension string to support devices, etc.
486 * @perm: create permissions
490 static struct p9_fid *
491 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
492 struct dentry *dentry, char *extension, u32 perm, u8 mode)
496 struct p9_fid *dfid, *ofid, *fid;
499 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
504 name = (char *) dentry->d_name.name;
505 dfid = v9fs_fid_lookup(dentry->d_parent);
508 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
512 /* clone a fid to use for creation */
513 ofid = p9_client_walk(dfid, 0, NULL, 1);
516 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
520 err = p9_client_fcreate(ofid, name, perm, mode, extension);
522 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
526 /* now walk from the parent so we can get unopened fid */
527 fid = p9_client_walk(dfid, 1, &name, 1);
530 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
535 /* instantiate inode and assign the unopened fid to the dentry */
536 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
538 err = PTR_ERR(inode);
539 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
544 dentry->d_op = &v9fs_cached_dentry_operations;
546 dentry->d_op = &v9fs_dentry_operations;
548 d_instantiate(dentry, inode);
549 err = v9fs_fid_add(dentry, fid);
557 p9_client_clunk(ofid);
560 p9_client_clunk(fid);
566 * v9fs_vfs_create - VFS hook to create files
567 * @dir: directory inode that is being created
568 * @dentry: dentry that is being deleted
569 * @mode: create permissions
570 * @nd: path information
575 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
576 struct nameidata *nd)
581 struct v9fs_session_info *v9ses;
587 v9ses = v9fs_inode2v9ses(dir);
588 perm = unixmode2p9mode(v9ses, mode);
589 if (nd && nd->flags & LOOKUP_OPEN)
590 flags = nd->intent.open.flags - 1;
594 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
595 v9fs_uflags2omode(flags,
596 v9fs_proto_dotu(v9ses)));
603 /* if we are opening a file, assign the open fid to the file */
604 if (nd && nd->flags & LOOKUP_OPEN) {
605 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
611 filp->private_data = fid;
613 p9_client_clunk(fid);
619 p9_client_clunk(fid);
625 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
626 * @dir: inode that is being unlinked
627 * @dentry: dentry that is being unlinked
628 * @mode: mode for new directory
632 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
636 struct v9fs_session_info *v9ses;
639 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
641 v9ses = v9fs_inode2v9ses(dir);
642 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
643 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
650 p9_client_clunk(fid);
656 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
657 * @dir: inode that is being walked from
658 * @dentry: dentry that is being walked to?
659 * @nameidata: path data
663 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
664 struct nameidata *nameidata)
666 struct super_block *sb;
667 struct v9fs_session_info *v9ses;
668 struct p9_fid *dfid, *fid;
673 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
674 dir, dentry->d_name.name, dentry, nameidata);
676 if (dentry->d_name.len > NAME_MAX)
677 return ERR_PTR(-ENAMETOOLONG);
680 v9ses = v9fs_inode2v9ses(dir);
681 dfid = v9fs_fid_lookup(dentry->d_parent);
683 return ERR_CAST(dfid);
685 name = (char *) dentry->d_name.name;
686 fid = p9_client_walk(dfid, 1, &name, 1);
688 result = PTR_ERR(fid);
689 if (result == -ENOENT) {
694 return ERR_PTR(result);
697 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
699 result = PTR_ERR(inode);
704 result = v9fs_fid_add(dentry, fid);
710 dentry->d_op = &v9fs_cached_dentry_operations;
712 dentry->d_op = &v9fs_dentry_operations;
714 d_add(dentry, inode);
718 p9_client_clunk(fid);
720 return ERR_PTR(result);
724 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
725 * @i: inode that is being unlinked
726 * @d: dentry that is being unlinked
730 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
732 return v9fs_remove(i, d, 0);
736 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
737 * @i: inode that is being unlinked
738 * @d: dentry that is being unlinked
742 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
744 return v9fs_remove(i, d, 1);
748 * v9fs_vfs_rename - VFS hook to rename an inode
749 * @old_dir: old dir inode
750 * @old_dentry: old dentry
751 * @new_dir: new dir inode
752 * @new_dentry: new dentry
757 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
758 struct inode *new_dir, struct dentry *new_dentry)
760 struct inode *old_inode;
761 struct v9fs_session_info *v9ses;
762 struct p9_fid *oldfid;
763 struct p9_fid *olddirfid;
764 struct p9_fid *newdirfid;
765 struct p9_wstat wstat;
768 P9_DPRINTK(P9_DEBUG_VFS, "\n");
770 old_inode = old_dentry->d_inode;
771 v9ses = v9fs_inode2v9ses(old_inode);
772 oldfid = v9fs_fid_lookup(old_dentry);
774 return PTR_ERR(oldfid);
776 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
777 if (IS_ERR(olddirfid)) {
778 retval = PTR_ERR(olddirfid);
782 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
783 if (IS_ERR(newdirfid)) {
784 retval = PTR_ERR(newdirfid);
788 if (v9fs_proto_dotl(v9ses)) {
789 retval = p9_client_rename(oldfid, newdirfid,
790 (char *) new_dentry->d_name.name);
791 if (retval != -ENOSYS)
795 /* 9P can only handle file rename in the same directory */
796 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
797 P9_DPRINTK(P9_DEBUG_ERROR,
798 "old dir and new dir are different\n");
803 v9fs_blank_wstat(&wstat);
804 wstat.muid = v9ses->uname;
805 wstat.name = (char *) new_dentry->d_name.name;
806 retval = p9_client_wstat(oldfid, &wstat);
809 p9_client_clunk(newdirfid);
812 p9_client_clunk(olddirfid);
819 * v9fs_vfs_getattr - retrieve file metadata
820 * @mnt: mount information
821 * @dentry: file to get attributes on
822 * @stat: metadata structure to populate
827 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
831 struct v9fs_session_info *v9ses;
835 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
837 v9ses = v9fs_inode2v9ses(dentry->d_inode);
838 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
839 return simple_getattr(mnt, dentry, stat);
841 fid = v9fs_fid_lookup(dentry);
845 st = p9_client_stat(fid);
849 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
850 generic_fillattr(dentry->d_inode, stat);
857 * v9fs_vfs_setattr - set file metadata
858 * @dentry: file whose metadata to set
859 * @iattr: metadata assignment structure
863 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
866 struct v9fs_session_info *v9ses;
868 struct p9_wstat wstat;
870 P9_DPRINTK(P9_DEBUG_VFS, "\n");
872 v9ses = v9fs_inode2v9ses(dentry->d_inode);
873 fid = v9fs_fid_lookup(dentry);
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 (v9fs_proto_dotu(v9ses)) {
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 retval = p9_client_wstat(fid, &wstat);
900 retval = inode_setattr(dentry->d_inode, iattr);
906 * v9fs_stat2inode - populate an inode structure with mistat info
907 * @stat: Plan 9 metadata (mistat) structure
908 * @inode: inode to populate
909 * @sb: superblock of filesystem
914 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
915 struct super_block *sb)
919 unsigned int i_nlink;
920 struct v9fs_session_info *v9ses = sb->s_fs_info;
924 inode->i_atime.tv_sec = stat->atime;
925 inode->i_mtime.tv_sec = stat->mtime;
926 inode->i_ctime.tv_sec = stat->mtime;
928 inode->i_uid = v9ses->dfltuid;
929 inode->i_gid = v9ses->dfltgid;
931 if (v9fs_proto_dotu(v9ses)) {
932 inode->i_uid = stat->n_uid;
933 inode->i_gid = stat->n_gid;
935 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
936 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
938 * Hadlink support got added later to
939 * to the .u extension. So there can be
940 * server out there that doesn't support
941 * this even with .u extension. So check
942 * for non NULL stat->extension
944 strncpy(ext, stat->extension, sizeof(ext));
945 /* HARDLINKCOUNT %u */
946 sscanf(ext, "%13s %u", tag_name, &i_nlink);
947 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
948 inode->i_nlink = i_nlink;
951 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
952 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
957 strncpy(ext, stat->extension, sizeof(ext));
958 sscanf(ext, "%c %u %u", &type, &major, &minor);
961 inode->i_mode &= ~S_IFBLK;
962 inode->i_mode |= S_IFCHR;
967 P9_DPRINTK(P9_DEBUG_ERROR,
968 "Unknown special type %c %s\n", type,
971 inode->i_rdev = MKDEV(major, minor);
972 init_special_inode(inode, inode->i_mode, inode->i_rdev);
976 i_size_write(inode, stat->length);
978 /* not real number of blocks, but 512 byte ones ... */
979 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
983 * v9fs_qid2ino - convert qid into inode number
986 * BUG: potential for inode number collisions?
989 ino_t v9fs_qid2ino(struct p9_qid *qid)
991 u64 path = qid->path + 2;
994 if (sizeof(ino_t) == sizeof(path))
995 memcpy(&i, &path, sizeof(ino_t));
997 i = (ino_t) (path ^ (path >> 32));
1003 * v9fs_readlink - read a symlink's location (internal version)
1004 * @dentry: dentry for symlink
1005 * @buffer: buffer to load symlink location into
1006 * @buflen: length of buffer
1010 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1014 struct v9fs_session_info *v9ses;
1016 struct p9_wstat *st;
1018 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1020 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1021 fid = v9fs_fid_lookup(dentry);
1023 return PTR_ERR(fid);
1025 if (!v9fs_proto_dotu(v9ses))
1028 st = p9_client_stat(fid);
1032 if (!(st->mode & P9_DMSYMLINK)) {
1037 /* copy extension buffer into buffer */
1038 strncpy(buffer, st->extension, buflen);
1040 P9_DPRINTK(P9_DEBUG_VFS,
1041 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1043 retval = strnlen(buffer, buflen);
1050 * v9fs_vfs_follow_link - follow a symlink path
1051 * @dentry: dentry for symlink
1056 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1059 char *link = __getname();
1061 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1064 link = ERR_PTR(-ENOMEM);
1066 len = v9fs_readlink(dentry, link, PATH_MAX);
1070 link = ERR_PTR(len);
1072 link[min(len, PATH_MAX-1)] = 0;
1074 nd_set_link(nd, link);
1080 * v9fs_vfs_put_link - release a symlink path
1081 * @dentry: dentry for symlink
1088 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1090 char *s = nd_get_link(nd);
1092 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1093 IS_ERR(s) ? "<error>" : s);
1099 * v9fs_vfs_mkspecial - create a special file
1100 * @dir: inode to create special file in
1101 * @dentry: dentry to create
1102 * @mode: mode to create special file
1103 * @extension: 9p2000.u format extension string representing special file
1107 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1108 int mode, const char *extension)
1111 struct v9fs_session_info *v9ses;
1114 v9ses = v9fs_inode2v9ses(dir);
1115 if (!v9fs_proto_dotu(v9ses)) {
1116 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1120 perm = unixmode2p9mode(v9ses, mode);
1121 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1124 return PTR_ERR(fid);
1126 p9_client_clunk(fid);
1131 * v9fs_vfs_symlink - helper function to create symlinks
1132 * @dir: directory inode containing symlink
1133 * @dentry: dentry for symlink
1134 * @symname: symlink data
1136 * See Also: 9P2000.u RFC for more information
1141 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1143 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1144 dentry->d_name.name, symname);
1146 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1150 * v9fs_vfs_link - create a hardlink
1151 * @old_dentry: dentry for file to link to
1152 * @dir: inode destination for new link
1153 * @dentry: dentry for link
1158 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1159 struct dentry *dentry)
1162 struct p9_fid *oldfid;
1165 P9_DPRINTK(P9_DEBUG_VFS,
1166 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1167 old_dentry->d_name.name);
1169 oldfid = v9fs_fid_clone(old_dentry);
1171 return PTR_ERR(oldfid);
1174 if (unlikely(!name)) {
1179 sprintf(name, "%d\n", oldfid->fid);
1180 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1184 p9_client_clunk(oldfid);
1189 * v9fs_vfs_mknod - create a special file
1190 * @dir: inode destination for new link
1191 * @dentry: dentry for file
1192 * @mode: mode for creation
1193 * @rdev: device associated with special file
1198 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1203 P9_DPRINTK(P9_DEBUG_VFS,
1204 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1205 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1207 if (!new_valid_dev(rdev))
1213 /* build extension */
1215 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1216 else if (S_ISCHR(mode))
1217 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1218 else if (S_ISFIFO(mode))
1220 else if (S_ISSOCK(mode))
1227 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1233 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1234 .create = v9fs_vfs_create,
1235 .lookup = v9fs_vfs_lookup,
1236 .symlink = v9fs_vfs_symlink,
1237 .link = v9fs_vfs_link,
1238 .unlink = v9fs_vfs_unlink,
1239 .mkdir = v9fs_vfs_mkdir,
1240 .rmdir = v9fs_vfs_rmdir,
1241 .mknod = v9fs_vfs_mknod,
1242 .rename = v9fs_vfs_rename,
1243 .getattr = v9fs_vfs_getattr,
1244 .setattr = v9fs_vfs_setattr,
1247 static const struct inode_operations v9fs_dir_inode_operations_dotl = {
1248 .create = v9fs_vfs_create,
1249 .lookup = v9fs_vfs_lookup,
1250 .symlink = v9fs_vfs_symlink,
1251 .link = v9fs_vfs_link,
1252 .unlink = v9fs_vfs_unlink,
1253 .mkdir = v9fs_vfs_mkdir,
1254 .rmdir = v9fs_vfs_rmdir,
1255 .mknod = v9fs_vfs_mknod,
1256 .rename = v9fs_vfs_rename,
1257 .getattr = v9fs_vfs_getattr,
1258 .setattr = v9fs_vfs_setattr,
1261 static const struct inode_operations v9fs_dir_inode_operations = {
1262 .create = v9fs_vfs_create,
1263 .lookup = v9fs_vfs_lookup,
1264 .unlink = v9fs_vfs_unlink,
1265 .mkdir = v9fs_vfs_mkdir,
1266 .rmdir = v9fs_vfs_rmdir,
1267 .mknod = v9fs_vfs_mknod,
1268 .rename = v9fs_vfs_rename,
1269 .getattr = v9fs_vfs_getattr,
1270 .setattr = v9fs_vfs_setattr,
1273 static const struct inode_operations v9fs_file_inode_operations = {
1274 .getattr = v9fs_vfs_getattr,
1275 .setattr = v9fs_vfs_setattr,
1278 static const struct inode_operations v9fs_file_inode_operations_dotl = {
1279 .getattr = v9fs_vfs_getattr,
1280 .setattr = v9fs_vfs_setattr,
1283 static const struct inode_operations v9fs_symlink_inode_operations = {
1284 .readlink = generic_readlink,
1285 .follow_link = v9fs_vfs_follow_link,
1286 .put_link = v9fs_vfs_put_link,
1287 .getattr = v9fs_vfs_getattr,
1288 .setattr = v9fs_vfs_setattr,
1291 static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1292 .readlink = generic_readlink,
1293 .follow_link = v9fs_vfs_follow_link,
1294 .put_link = v9fs_vfs_put_link,
1295 .getattr = v9fs_vfs_getattr,
1296 .setattr = v9fs_vfs_setattr,