2 * linux/fs/9p/vfs_inode.c
4 * This file contains vfs inode ops for the 9P2000 protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
50 static const struct inode_operations v9fs_dir_inode_operations;
51 static const struct inode_operations v9fs_dir_inode_operations_dotu;
52 static const struct inode_operations v9fs_file_inode_operations;
53 static const struct inode_operations v9fs_symlink_inode_operations;
56 * unixmode2p9mode - convert unix mode bits to plan 9
57 * @v9ses: v9fs session information
58 * @mode: mode to convert
62 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
68 if (v9fs_proto_dotu(v9ses)) {
71 if (v9ses->nodev == 0) {
75 res |= P9_DMNAMEDPIPE;
82 if ((mode & S_ISUID) == S_ISUID)
84 if ((mode & S_ISGID) == S_ISGID)
86 if ((mode & S_ISVTX) == S_ISVTX)
88 if ((mode & P9_DMLINK))
96 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
97 * @v9ses: v9fs session information
98 * @mode: mode to convert
102 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
108 if ((mode & P9_DMDIR) == P9_DMDIR)
110 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
112 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
113 && (v9ses->nodev == 0))
115 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
116 && (v9ses->nodev == 0))
118 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
119 && (v9ses->nodev == 0))
124 if (v9fs_proto_dotu(v9ses)) {
125 if ((mode & P9_DMSETUID) == P9_DMSETUID)
128 if ((mode & P9_DMSETGID) == P9_DMSETGID)
131 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
139 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
140 * @uflags: flags to convert
141 * @extended: if .u extensions are active
144 int v9fs_uflags2omode(int uflags, int extended)
164 if (uflags & O_TRUNC)
171 if (uflags & O_APPEND)
179 * v9fs_blank_wstat - helper function to setup a 9P stat structure
180 * @wstat: structure to initialize
185 v9fs_blank_wstat(struct p9_wstat *wstat)
189 wstat->qid.type = ~0;
190 wstat->qid.version = ~0;
191 *((long long *)&wstat->qid.path) = ~0;
203 wstat->extension = NULL;
206 #ifdef CONFIG_9P_FSCACHE
208 * v9fs_alloc_inode - helper function to allocate an inode
209 * This callback is executed before setting up the inode so that we
210 * can associate a vcookie with each inode.
214 struct inode *v9fs_alloc_inode(struct super_block *sb)
216 struct v9fs_cookie *vcookie;
217 vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
222 vcookie->fscache = NULL;
224 spin_lock_init(&vcookie->lock);
225 return &vcookie->inode;
229 * v9fs_destroy_inode - destroy an inode
233 static void v9fs_i_callback(struct rcu_head *head)
235 struct inode *inode = container_of(head, struct inode, i_rcu);
236 INIT_LIST_HEAD(&inode->i_dentry);
237 kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
240 void v9fs_destroy_inode(struct inode *inode)
242 call_rcu(&inode->i_rcu, v9fs_i_callback);
247 * v9fs_get_inode - helper function to setup an inode
249 * @mode: mode to setup inode with
253 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
257 struct v9fs_session_info *v9ses = sb->s_fs_info;
259 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
261 inode = new_inode(sb);
263 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
264 return ERR_PTR(-ENOMEM);
267 inode_init_owner(inode, NULL, mode);
270 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
271 inode->i_mapping->a_ops = &v9fs_addr_operations;
273 switch (mode & S_IFMT) {
278 if (v9fs_proto_dotl(v9ses)) {
279 inode->i_op = &v9fs_file_inode_operations_dotl;
280 inode->i_fop = &v9fs_file_operations_dotl;
281 } else if (v9fs_proto_dotu(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations;
283 inode->i_fop = &v9fs_file_operations;
285 P9_DPRINTK(P9_DEBUG_ERROR,
286 "special files without extended mode\n");
290 init_special_inode(inode, inode->i_mode, inode->i_rdev);
293 if (v9fs_proto_dotl(v9ses)) {
294 inode->i_op = &v9fs_file_inode_operations_dotl;
297 &v9fs_cached_file_operations_dotl;
299 inode->i_fop = &v9fs_file_operations_dotl;
301 inode->i_op = &v9fs_file_inode_operations;
303 inode->i_fop = &v9fs_cached_file_operations;
305 inode->i_fop = &v9fs_file_operations;
311 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
312 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
313 "legacy protocol.\n");
318 if (v9fs_proto_dotl(v9ses))
319 inode->i_op = &v9fs_symlink_inode_operations_dotl;
321 inode->i_op = &v9fs_symlink_inode_operations;
326 if (v9fs_proto_dotl(v9ses))
327 inode->i_op = &v9fs_dir_inode_operations_dotl;
328 else if (v9fs_proto_dotu(v9ses))
329 inode->i_op = &v9fs_dir_inode_operations_dotu;
331 inode->i_op = &v9fs_dir_inode_operations;
333 if (v9fs_proto_dotl(v9ses))
334 inode->i_fop = &v9fs_dir_operations_dotl;
336 inode->i_fop = &v9fs_dir_operations;
340 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
341 mode, mode & S_IFMT);
354 static struct v9fs_fid*
355 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
359 struct v9fs_fid *ret;
360 struct v9fs_fcall *fcall;
362 nfid = v9fs_get_idpool(&v9ses->fidpool);
364 eprintk(KERN_WARNING, "no free fids available\n");
365 return ERR_PTR(-ENOSPC);
368 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
372 if (fcall && fcall->id == RWALK)
375 PRINT_FCALL_ERROR("walk error", fcall);
376 v9fs_put_idpool(nfid, &v9ses->fidpool);
382 ret = v9fs_fid_create(v9ses, nfid);
388 err = v9fs_fid_insert(ret, dentry);
390 v9fs_fid_destroy(ret);
397 v9fs_t_clunk(v9ses, nfid);
407 * v9fs_clear_inode - release an inode
408 * @inode: inode to release
411 void v9fs_evict_inode(struct inode *inode)
413 truncate_inode_pages(inode->i_mapping, 0);
414 end_writeback(inode);
415 filemap_fdatawrite(inode->i_mapping);
417 #ifdef CONFIG_9P_FSCACHE
418 v9fs_cache_inode_put_cookie(inode);
423 v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
424 struct super_block *sb)
427 struct inode *ret = NULL;
430 st = p9_client_stat(fid);
434 umode = p9mode2unixmode(v9ses, st->mode);
435 ret = v9fs_get_inode(sb, umode);
441 v9fs_stat2inode(st, ret, sb);
442 ret->i_ino = v9fs_qid2ino(&st->qid);
444 #ifdef CONFIG_9P_FSCACHE
445 v9fs_vcookie_set_qid(ret, &st->qid);
446 v9fs_cache_inode_get_cookie(ret);
458 * v9fs_remove - helper function to remove files and directories
459 * @dir: directory inode that is being deleted
460 * @file: dentry that is being deleted
461 * @rmdir: removing a directory
465 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
468 struct inode *file_inode;
469 struct p9_fid *v9fid;
471 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
474 file_inode = file->d_inode;
475 v9fid = v9fs_fid_clone(file);
477 return PTR_ERR(v9fid);
479 retval = p9_client_remove(v9fid);
481 drop_nlink(file_inode);
486 * v9fs_create - Create a file
487 * @v9ses: session information
488 * @dir: directory that dentry is being created in
489 * @dentry: dentry that is being created
490 * @extension: 9p2000.u extension string to support devices, etc.
491 * @perm: create permissions
495 static struct p9_fid *
496 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
497 struct dentry *dentry, char *extension, u32 perm, u8 mode)
501 struct p9_fid *dfid, *ofid, *fid;
504 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
509 name = (char *) dentry->d_name.name;
510 dfid = v9fs_fid_lookup(dentry->d_parent);
513 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup 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);
525 err = p9_client_fcreate(ofid, name, perm, mode, extension);
527 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
531 /* now walk from the parent so we can get unopened fid */
532 fid = p9_client_walk(dfid, 1, &name, 1);
535 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
540 /* instantiate inode and assign the unopened fid to the dentry */
541 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
543 err = PTR_ERR(inode);
544 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
547 d_instantiate(dentry, inode);
548 err = v9fs_fid_add(dentry, fid);
556 p9_client_clunk(ofid);
559 p9_client_clunk(fid);
565 * v9fs_vfs_create - VFS hook to create files
566 * @dir: directory inode that is being created
567 * @dentry: dentry that is being deleted
568 * @mode: create permissions
569 * @nd: path information
574 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
575 struct nameidata *nd)
580 struct v9fs_session_info *v9ses;
586 v9ses = v9fs_inode2v9ses(dir);
587 perm = unixmode2p9mode(v9ses, mode);
588 if (nd && nd->flags & LOOKUP_OPEN)
589 flags = nd->intent.open.flags - 1;
593 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
594 v9fs_uflags2omode(flags,
595 v9fs_proto_dotu(v9ses)));
602 /* if we are opening a file, assign the open fid to the file */
603 if (nd && nd->flags & LOOKUP_OPEN) {
604 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
610 filp->private_data = fid;
612 p9_client_clunk(fid);
618 p9_client_clunk(fid);
624 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
625 * @dir: inode that is being unlinked
626 * @dentry: dentry that is being unlinked
627 * @mode: mode for new directory
631 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
635 struct v9fs_session_info *v9ses;
638 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
640 v9ses = v9fs_inode2v9ses(dir);
641 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
642 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
649 p9_client_clunk(fid);
655 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
656 * @dir: inode that is being walked from
657 * @dentry: dentry that is being walked to?
658 * @nameidata: path data
662 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
663 struct nameidata *nameidata)
665 struct super_block *sb;
666 struct v9fs_session_info *v9ses;
667 struct p9_fid *dfid, *fid;
672 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
673 dir, dentry->d_name.name, dentry, nameidata);
675 if (dentry->d_name.len > NAME_MAX)
676 return ERR_PTR(-ENAMETOOLONG);
679 v9ses = v9fs_inode2v9ses(dir);
680 /* We can walk d_parent because we hold the dir->i_mutex */
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);
709 d_add(dentry, inode);
715 p9_client_clunk(fid);
717 return ERR_PTR(result);
721 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
722 * @i: inode that is being unlinked
723 * @d: dentry that is being unlinked
727 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
729 return v9fs_remove(i, d, 0);
733 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
734 * @i: inode that is being unlinked
735 * @d: dentry that is being unlinked
739 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
741 return v9fs_remove(i, d, 1);
745 * v9fs_vfs_rename - VFS hook to rename an inode
746 * @old_dir: old dir inode
747 * @old_dentry: old dentry
748 * @new_dir: new dir inode
749 * @new_dentry: new dentry
754 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
755 struct inode *new_dir, struct dentry *new_dentry)
757 struct inode *old_inode;
758 struct v9fs_session_info *v9ses;
759 struct p9_fid *oldfid;
760 struct p9_fid *olddirfid;
761 struct p9_fid *newdirfid;
762 struct p9_wstat wstat;
765 P9_DPRINTK(P9_DEBUG_VFS, "\n");
767 old_inode = old_dentry->d_inode;
768 v9ses = v9fs_inode2v9ses(old_inode);
769 oldfid = v9fs_fid_lookup(old_dentry);
771 return PTR_ERR(oldfid);
773 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
774 if (IS_ERR(olddirfid)) {
775 retval = PTR_ERR(olddirfid);
779 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
780 if (IS_ERR(newdirfid)) {
781 retval = PTR_ERR(newdirfid);
785 down_write(&v9ses->rename_sem);
786 if (v9fs_proto_dotl(v9ses)) {
787 retval = p9_client_rename(oldfid, newdirfid,
788 (char *) new_dentry->d_name.name);
789 if (retval != -ENOSYS)
792 if (old_dentry->d_parent != new_dentry->d_parent) {
794 * 9P .u can only handle file rename in the same directory
797 P9_DPRINTK(P9_DEBUG_ERROR,
798 "old dir and new dir are different\n");
802 v9fs_blank_wstat(&wstat);
803 wstat.muid = v9ses->uname;
804 wstat.name = (char *) new_dentry->d_name.name;
805 retval = p9_client_wstat(oldfid, &wstat);
809 /* successful rename */
810 d_move(old_dentry, new_dentry);
811 up_write(&v9ses->rename_sem);
812 p9_client_clunk(newdirfid);
815 p9_client_clunk(olddirfid);
822 * v9fs_vfs_getattr - retrieve file metadata
823 * @mnt: mount information
824 * @dentry: file to get attributes on
825 * @stat: metadata structure to populate
830 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
834 struct v9fs_session_info *v9ses;
838 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
840 v9ses = v9fs_inode2v9ses(dentry->d_inode);
841 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
842 return simple_getattr(mnt, dentry, stat);
844 fid = v9fs_fid_lookup(dentry);
848 st = p9_client_stat(fid);
852 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
853 generic_fillattr(dentry->d_inode, stat);
861 * v9fs_vfs_setattr - set file metadata
862 * @dentry: file whose metadata to set
863 * @iattr: metadata assignment structure
867 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
870 struct v9fs_session_info *v9ses;
872 struct p9_wstat wstat;
874 P9_DPRINTK(P9_DEBUG_VFS, "\n");
876 v9ses = v9fs_inode2v9ses(dentry->d_inode);
877 fid = v9fs_fid_lookup(dentry);
881 v9fs_blank_wstat(&wstat);
882 if (iattr->ia_valid & ATTR_MODE)
883 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
885 if (iattr->ia_valid & ATTR_MTIME)
886 wstat.mtime = iattr->ia_mtime.tv_sec;
888 if (iattr->ia_valid & ATTR_ATIME)
889 wstat.atime = iattr->ia_atime.tv_sec;
891 if (iattr->ia_valid & ATTR_SIZE)
892 wstat.length = iattr->ia_size;
894 if (v9fs_proto_dotu(v9ses)) {
895 if (iattr->ia_valid & ATTR_UID)
896 wstat.n_uid = iattr->ia_uid;
898 if (iattr->ia_valid & ATTR_GID)
899 wstat.n_gid = iattr->ia_gid;
902 retval = p9_client_wstat(fid, &wstat);
906 if ((iattr->ia_valid & ATTR_SIZE) &&
907 iattr->ia_size != i_size_read(dentry->d_inode)) {
908 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
913 setattr_copy(dentry->d_inode, iattr);
914 mark_inode_dirty(dentry->d_inode);
919 * v9fs_stat2inode - populate an inode structure with mistat info
920 * @stat: Plan 9 metadata (mistat) structure
921 * @inode: inode to populate
922 * @sb: superblock of filesystem
927 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
928 struct super_block *sb)
932 unsigned int i_nlink;
933 struct v9fs_session_info *v9ses = sb->s_fs_info;
937 inode->i_atime.tv_sec = stat->atime;
938 inode->i_mtime.tv_sec = stat->mtime;
939 inode->i_ctime.tv_sec = stat->mtime;
941 inode->i_uid = v9ses->dfltuid;
942 inode->i_gid = v9ses->dfltgid;
944 if (v9fs_proto_dotu(v9ses)) {
945 inode->i_uid = stat->n_uid;
946 inode->i_gid = stat->n_gid;
948 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
949 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
951 * Hadlink support got added later to
952 * to the .u extension. So there can be
953 * server out there that doesn't support
954 * this even with .u extension. So check
955 * for non NULL stat->extension
957 strncpy(ext, stat->extension, sizeof(ext));
958 /* HARDLINKCOUNT %u */
959 sscanf(ext, "%13s %u", tag_name, &i_nlink);
960 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
961 inode->i_nlink = i_nlink;
964 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
965 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
970 strncpy(ext, stat->extension, sizeof(ext));
971 sscanf(ext, "%c %u %u", &type, &major, &minor);
974 inode->i_mode &= ~S_IFBLK;
975 inode->i_mode |= S_IFCHR;
980 P9_DPRINTK(P9_DEBUG_ERROR,
981 "Unknown special type %c %s\n", type,
984 inode->i_rdev = MKDEV(major, minor);
985 init_special_inode(inode, inode->i_mode, inode->i_rdev);
989 i_size_write(inode, stat->length);
991 /* not real number of blocks, but 512 byte ones ... */
992 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
996 * v9fs_qid2ino - convert qid into inode number
999 * BUG: potential for inode number collisions?
1002 ino_t v9fs_qid2ino(struct p9_qid *qid)
1004 u64 path = qid->path + 2;
1007 if (sizeof(ino_t) == sizeof(path))
1008 memcpy(&i, &path, sizeof(ino_t));
1010 i = (ino_t) (path ^ (path >> 32));
1016 * v9fs_readlink - read a symlink's location (internal version)
1017 * @dentry: dentry for symlink
1018 * @buffer: buffer to load symlink location into
1019 * @buflen: length of buffer
1023 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1027 struct v9fs_session_info *v9ses;
1029 struct p9_wstat *st;
1031 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1033 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1034 fid = v9fs_fid_lookup(dentry);
1036 return PTR_ERR(fid);
1038 if (!v9fs_proto_dotu(v9ses))
1041 st = p9_client_stat(fid);
1045 if (!(st->mode & P9_DMSYMLINK)) {
1050 /* copy extension buffer into buffer */
1051 strncpy(buffer, st->extension, buflen);
1053 P9_DPRINTK(P9_DEBUG_VFS,
1054 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1056 retval = strnlen(buffer, buflen);
1064 * v9fs_vfs_follow_link - follow a symlink path
1065 * @dentry: dentry for symlink
1070 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1073 char *link = __getname();
1075 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1078 link = ERR_PTR(-ENOMEM);
1080 len = v9fs_readlink(dentry, link, PATH_MAX);
1084 link = ERR_PTR(len);
1086 link[min(len, PATH_MAX-1)] = 0;
1088 nd_set_link(nd, link);
1094 * v9fs_vfs_put_link - release a symlink path
1095 * @dentry: dentry for symlink
1102 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1104 char *s = nd_get_link(nd);
1106 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1107 IS_ERR(s) ? "<error>" : s);
1113 * v9fs_vfs_mkspecial - create a special file
1114 * @dir: inode to create special file in
1115 * @dentry: dentry to create
1116 * @mode: mode to create special file
1117 * @extension: 9p2000.u format extension string representing special file
1121 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1122 int mode, const char *extension)
1125 struct v9fs_session_info *v9ses;
1128 v9ses = v9fs_inode2v9ses(dir);
1129 if (!v9fs_proto_dotu(v9ses)) {
1130 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1134 perm = unixmode2p9mode(v9ses, mode);
1135 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1138 return PTR_ERR(fid);
1140 p9_client_clunk(fid);
1145 * v9fs_vfs_symlink - helper function to create symlinks
1146 * @dir: directory inode containing symlink
1147 * @dentry: dentry for symlink
1148 * @symname: symlink data
1150 * See Also: 9P2000.u RFC for more information
1155 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1157 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1158 dentry->d_name.name, symname);
1160 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1164 * v9fs_vfs_link - create a hardlink
1165 * @old_dentry: dentry for file to link to
1166 * @dir: inode destination for new link
1167 * @dentry: dentry for link
1172 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1173 struct dentry *dentry)
1176 struct p9_fid *oldfid;
1179 P9_DPRINTK(P9_DEBUG_VFS,
1180 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1181 old_dentry->d_name.name);
1183 oldfid = v9fs_fid_clone(old_dentry);
1185 return PTR_ERR(oldfid);
1188 if (unlikely(!name)) {
1193 sprintf(name, "%d\n", oldfid->fid);
1194 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1198 p9_client_clunk(oldfid);
1203 * v9fs_vfs_mknod - create a special file
1204 * @dir: inode destination for new link
1205 * @dentry: dentry for file
1206 * @mode: mode for creation
1207 * @rdev: device associated with special file
1212 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1217 P9_DPRINTK(P9_DEBUG_VFS,
1218 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1219 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1221 if (!new_valid_dev(rdev))
1227 /* build extension */
1229 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1230 else if (S_ISCHR(mode))
1231 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1232 else if (S_ISFIFO(mode))
1234 else if (S_ISSOCK(mode))
1241 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1247 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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_symlink_inode_operations = {
1279 .readlink = generic_readlink,
1280 .follow_link = v9fs_vfs_follow_link,
1281 .put_link = v9fs_vfs_put_link,
1282 .getattr = v9fs_vfs_getattr,
1283 .setattr = v9fs_vfs_setattr,