xref: /openbmc/linux/fs/9p/vfs_inode.c (revision 565d76cb)
1 /*
2  *  linux/fs/9p/vfs_inode.c
3  *
4  * This file contains vfs inode ops for the 9P2000 protocol.
5  *
6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8  *
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.
12  *
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.
17  *
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
23  *
24  */
25 
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.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>
42 
43 #include "v9fs.h"
44 #include "v9fs_vfs.h"
45 #include "fid.h"
46 #include "cache.h"
47 #include "xattr.h"
48 #include "acl.h"
49 
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;
54 
55 /**
56  * unixmode2p9mode - convert unix mode bits to plan 9
57  * @v9ses: v9fs session information
58  * @mode: mode to convert
59  *
60  */
61 
62 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
63 {
64 	int res;
65 	res = mode & 0777;
66 	if (S_ISDIR(mode))
67 		res |= P9_DMDIR;
68 	if (v9fs_proto_dotu(v9ses)) {
69 		if (S_ISLNK(mode))
70 			res |= P9_DMSYMLINK;
71 		if (v9ses->nodev == 0) {
72 			if (S_ISSOCK(mode))
73 				res |= P9_DMSOCKET;
74 			if (S_ISFIFO(mode))
75 				res |= P9_DMNAMEDPIPE;
76 			if (S_ISBLK(mode))
77 				res |= P9_DMDEVICE;
78 			if (S_ISCHR(mode))
79 				res |= P9_DMDEVICE;
80 		}
81 
82 		if ((mode & S_ISUID) == S_ISUID)
83 			res |= P9_DMSETUID;
84 		if ((mode & S_ISGID) == S_ISGID)
85 			res |= P9_DMSETGID;
86 		if ((mode & S_ISVTX) == S_ISVTX)
87 			res |= P9_DMSETVTX;
88 		if ((mode & P9_DMLINK))
89 			res |= P9_DMLINK;
90 	}
91 
92 	return res;
93 }
94 
95 /**
96  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
97  * @v9ses: v9fs session information
98  * @mode: mode to convert
99  *
100  */
101 
102 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
103 {
104 	int res;
105 
106 	res = mode & 0777;
107 
108 	if ((mode & P9_DMDIR) == P9_DMDIR)
109 		res |= S_IFDIR;
110 	else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
111 		res |= S_IFLNK;
112 	else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
113 		 && (v9ses->nodev == 0))
114 		res |= S_IFSOCK;
115 	else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
116 		 && (v9ses->nodev == 0))
117 		res |= S_IFIFO;
118 	else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
119 		 && (v9ses->nodev == 0))
120 		res |= S_IFBLK;
121 	else
122 		res |= S_IFREG;
123 
124 	if (v9fs_proto_dotu(v9ses)) {
125 		if ((mode & P9_DMSETUID) == P9_DMSETUID)
126 			res |= S_ISUID;
127 
128 		if ((mode & P9_DMSETGID) == P9_DMSETGID)
129 			res |= S_ISGID;
130 
131 		if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
132 			res |= S_ISVTX;
133 	}
134 
135 	return res;
136 }
137 
138 /**
139  * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
140  * @uflags: flags to convert
141  * @extended: if .u extensions are active
142  */
143 
144 int v9fs_uflags2omode(int uflags, int extended)
145 {
146 	int ret;
147 
148 	ret = 0;
149 	switch (uflags&3) {
150 	default:
151 	case O_RDONLY:
152 		ret = P9_OREAD;
153 		break;
154 
155 	case O_WRONLY:
156 		ret = P9_OWRITE;
157 		break;
158 
159 	case O_RDWR:
160 		ret = P9_ORDWR;
161 		break;
162 	}
163 
164 	if (uflags & O_TRUNC)
165 		ret |= P9_OTRUNC;
166 
167 	if (extended) {
168 		if (uflags & O_EXCL)
169 			ret |= P9_OEXCL;
170 
171 		if (uflags & O_APPEND)
172 			ret |= P9_OAPPEND;
173 	}
174 
175 	return ret;
176 }
177 
178 /**
179  * v9fs_blank_wstat - helper function to setup a 9P stat structure
180  * @wstat: structure to initialize
181  *
182  */
183 
184 void
185 v9fs_blank_wstat(struct p9_wstat *wstat)
186 {
187 	wstat->type = ~0;
188 	wstat->dev = ~0;
189 	wstat->qid.type = ~0;
190 	wstat->qid.version = ~0;
191 	*((long long *)&wstat->qid.path) = ~0;
192 	wstat->mode = ~0;
193 	wstat->atime = ~0;
194 	wstat->mtime = ~0;
195 	wstat->length = ~0;
196 	wstat->name = NULL;
197 	wstat->uid = NULL;
198 	wstat->gid = NULL;
199 	wstat->muid = NULL;
200 	wstat->n_uid = ~0;
201 	wstat->n_gid = ~0;
202 	wstat->n_muid = ~0;
203 	wstat->extension = NULL;
204 }
205 
206 /**
207  * v9fs_alloc_inode - helper function to allocate an inode
208  *
209  */
210 struct inode *v9fs_alloc_inode(struct super_block *sb)
211 {
212 	struct v9fs_inode *v9inode;
213 	v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
214 							GFP_KERNEL);
215 	if (!v9inode)
216 		return NULL;
217 #ifdef CONFIG_9P_FSCACHE
218 	v9inode->fscache = NULL;
219 	v9inode->fscache_key = NULL;
220 	spin_lock_init(&v9inode->fscache_lock);
221 #endif
222 	v9inode->writeback_fid = NULL;
223 	v9inode->cache_validity = 0;
224 	mutex_init(&v9inode->v_mutex);
225 	return &v9inode->vfs_inode;
226 }
227 
228 /**
229  * v9fs_destroy_inode - destroy an inode
230  *
231  */
232 
233 static void v9fs_i_callback(struct rcu_head *head)
234 {
235 	struct inode *inode = container_of(head, struct inode, i_rcu);
236 	INIT_LIST_HEAD(&inode->i_dentry);
237 	kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
238 }
239 
240 void v9fs_destroy_inode(struct inode *inode)
241 {
242 	call_rcu(&inode->i_rcu, v9fs_i_callback);
243 }
244 
245 int v9fs_init_inode(struct v9fs_session_info *v9ses,
246 		    struct inode *inode, int mode)
247 {
248 	int err = 0;
249 
250 	inode_init_owner(inode, NULL, mode);
251 	inode->i_blocks = 0;
252 	inode->i_rdev = 0;
253 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
254 	inode->i_mapping->a_ops = &v9fs_addr_operations;
255 
256 	switch (mode & S_IFMT) {
257 	case S_IFIFO:
258 	case S_IFBLK:
259 	case S_IFCHR:
260 	case S_IFSOCK:
261 		if (v9fs_proto_dotl(v9ses)) {
262 			inode->i_op = &v9fs_file_inode_operations_dotl;
263 			inode->i_fop = &v9fs_file_operations_dotl;
264 		} else if (v9fs_proto_dotu(v9ses)) {
265 			inode->i_op = &v9fs_file_inode_operations;
266 			inode->i_fop = &v9fs_file_operations;
267 		} else {
268 			P9_DPRINTK(P9_DEBUG_ERROR,
269 				   "special files without extended mode\n");
270 			err = -EINVAL;
271 			goto error;
272 		}
273 		init_special_inode(inode, inode->i_mode, inode->i_rdev);
274 		break;
275 	case S_IFREG:
276 		if (v9fs_proto_dotl(v9ses)) {
277 			inode->i_op = &v9fs_file_inode_operations_dotl;
278 			if (v9ses->cache)
279 				inode->i_fop =
280 					&v9fs_cached_file_operations_dotl;
281 			else
282 				inode->i_fop = &v9fs_file_operations_dotl;
283 		} else {
284 			inode->i_op = &v9fs_file_inode_operations;
285 			if (v9ses->cache)
286 				inode->i_fop = &v9fs_cached_file_operations;
287 			else
288 				inode->i_fop = &v9fs_file_operations;
289 		}
290 
291 		break;
292 	case S_IFLNK:
293 		if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
294 			P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
295 						"legacy protocol.\n");
296 			err = -EINVAL;
297 			goto error;
298 		}
299 
300 		if (v9fs_proto_dotl(v9ses))
301 			inode->i_op = &v9fs_symlink_inode_operations_dotl;
302 		else
303 			inode->i_op = &v9fs_symlink_inode_operations;
304 
305 		break;
306 	case S_IFDIR:
307 		inc_nlink(inode);
308 		if (v9fs_proto_dotl(v9ses))
309 			inode->i_op = &v9fs_dir_inode_operations_dotl;
310 		else if (v9fs_proto_dotu(v9ses))
311 			inode->i_op = &v9fs_dir_inode_operations_dotu;
312 		else
313 			inode->i_op = &v9fs_dir_inode_operations;
314 
315 		if (v9fs_proto_dotl(v9ses))
316 			inode->i_fop = &v9fs_dir_operations_dotl;
317 		else
318 			inode->i_fop = &v9fs_dir_operations;
319 
320 		break;
321 	default:
322 		P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
323 			   mode, mode & S_IFMT);
324 		err = -EINVAL;
325 		goto error;
326 	}
327 error:
328 	return err;
329 
330 }
331 
332 /**
333  * v9fs_get_inode - helper function to setup an inode
334  * @sb: superblock
335  * @mode: mode to setup inode with
336  *
337  */
338 
339 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
340 {
341 	int err;
342 	struct inode *inode;
343 	struct v9fs_session_info *v9ses = sb->s_fs_info;
344 
345 	P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
346 
347 	inode = new_inode(sb);
348 	if (!inode) {
349 		P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
350 		return ERR_PTR(-ENOMEM);
351 	}
352 	err = v9fs_init_inode(v9ses, inode, mode);
353 	if (err) {
354 		iput(inode);
355 		return ERR_PTR(err);
356 	}
357 	return inode;
358 }
359 
360 /*
361 static struct v9fs_fid*
362 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
363 {
364 	int err;
365 	int nfid;
366 	struct v9fs_fid *ret;
367 	struct v9fs_fcall *fcall;
368 
369 	nfid = v9fs_get_idpool(&v9ses->fidpool);
370 	if (nfid < 0) {
371 		eprintk(KERN_WARNING, "no free fids available\n");
372 		return ERR_PTR(-ENOSPC);
373 	}
374 
375 	err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
376 		&fcall);
377 
378 	if (err < 0) {
379 		if (fcall && fcall->id == RWALK)
380 			goto clunk_fid;
381 
382 		PRINT_FCALL_ERROR("walk error", fcall);
383 		v9fs_put_idpool(nfid, &v9ses->fidpool);
384 		goto error;
385 	}
386 
387 	kfree(fcall);
388 	fcall = NULL;
389 	ret = v9fs_fid_create(v9ses, nfid);
390 	if (!ret) {
391 		err = -ENOMEM;
392 		goto clunk_fid;
393 	}
394 
395 	err = v9fs_fid_insert(ret, dentry);
396 	if (err < 0) {
397 		v9fs_fid_destroy(ret);
398 		goto clunk_fid;
399 	}
400 
401 	return ret;
402 
403 clunk_fid:
404 	v9fs_t_clunk(v9ses, nfid);
405 
406 error:
407 	kfree(fcall);
408 	return ERR_PTR(err);
409 }
410 */
411 
412 
413 /**
414  * v9fs_clear_inode - release an inode
415  * @inode: inode to release
416  *
417  */
418 void v9fs_evict_inode(struct inode *inode)
419 {
420 	struct v9fs_inode *v9inode = V9FS_I(inode);
421 
422 	truncate_inode_pages(inode->i_mapping, 0);
423 	end_writeback(inode);
424 	filemap_fdatawrite(inode->i_mapping);
425 
426 #ifdef CONFIG_9P_FSCACHE
427 	v9fs_cache_inode_put_cookie(inode);
428 #endif
429 	/* clunk the fid stashed in writeback_fid */
430 	if (v9inode->writeback_fid) {
431 		p9_client_clunk(v9inode->writeback_fid);
432 		v9inode->writeback_fid = NULL;
433 	}
434 }
435 
436 static struct inode *v9fs_qid_iget(struct super_block *sb,
437 				   struct p9_qid *qid,
438 				   struct p9_wstat *st)
439 {
440 	int retval, umode;
441 	unsigned long i_ino;
442 	struct inode *inode;
443 	struct v9fs_session_info *v9ses = sb->s_fs_info;
444 
445 	i_ino = v9fs_qid2ino(qid);
446 	inode = iget_locked(sb, i_ino);
447 	if (!inode)
448 		return ERR_PTR(-ENOMEM);
449 	if (!(inode->i_state & I_NEW))
450 		return inode;
451 	/*
452 	 * initialize the inode with the stat info
453 	 * FIXME!! we may need support for stale inodes
454 	 * later.
455 	 */
456 	umode = p9mode2unixmode(v9ses, st->mode);
457 	retval = v9fs_init_inode(v9ses, inode, umode);
458 	if (retval)
459 		goto error;
460 
461 	v9fs_stat2inode(st, inode, sb);
462 #ifdef CONFIG_9P_FSCACHE
463 	v9fs_fscache_set_key(inode, &st->qid);
464 	v9fs_cache_inode_get_cookie(inode);
465 #endif
466 	unlock_new_inode(inode);
467 	return inode;
468 error:
469 	unlock_new_inode(inode);
470 	iput(inode);
471 	return ERR_PTR(retval);
472 
473 }
474 
475 struct inode *
476 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
477 		    struct super_block *sb)
478 {
479 	struct p9_wstat *st;
480 	struct inode *inode = NULL;
481 
482 	st = p9_client_stat(fid);
483 	if (IS_ERR(st))
484 		return ERR_CAST(st);
485 
486 	inode = v9fs_qid_iget(sb, &st->qid, st);
487 	p9stat_free(st);
488 	kfree(st);
489 	return inode;
490 }
491 
492 /**
493  * v9fs_remove - helper function to remove files and directories
494  * @dir: directory inode that is being deleted
495  * @file:  dentry that is being deleted
496  * @rmdir: removing a directory
497  *
498  */
499 
500 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
501 {
502 	int retval;
503 	struct p9_fid *v9fid;
504 	struct inode *file_inode;
505 
506 	P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
507 		rmdir);
508 
509 	file_inode = file->d_inode;
510 	v9fid = v9fs_fid_clone(file);
511 	if (IS_ERR(v9fid))
512 		return PTR_ERR(v9fid);
513 
514 	retval = p9_client_remove(v9fid);
515 	if (!retval) {
516 		/*
517 		 * directories on unlink should have zero
518 		 * link count
519 		 */
520 		if (rmdir) {
521 			clear_nlink(file_inode);
522 			drop_nlink(dir);
523 		} else
524 			drop_nlink(file_inode);
525 
526 		v9fs_invalidate_inode_attr(file_inode);
527 		v9fs_invalidate_inode_attr(dir);
528 	}
529 	return retval;
530 }
531 
532 /**
533  * v9fs_create - Create a file
534  * @v9ses: session information
535  * @dir: directory that dentry is being created in
536  * @dentry:  dentry that is being created
537  * @extension: 9p2000.u extension string to support devices, etc.
538  * @perm: create permissions
539  * @mode: open mode
540  *
541  */
542 static struct p9_fid *
543 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
544 		struct dentry *dentry, char *extension, u32 perm, u8 mode)
545 {
546 	int err;
547 	char *name;
548 	struct p9_fid *dfid, *ofid, *fid;
549 	struct inode *inode;
550 
551 	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
552 
553 	err = 0;
554 	ofid = NULL;
555 	fid = NULL;
556 	name = (char *) dentry->d_name.name;
557 	dfid = v9fs_fid_lookup(dentry->d_parent);
558 	if (IS_ERR(dfid)) {
559 		err = PTR_ERR(dfid);
560 		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
561 		return ERR_PTR(err);
562 	}
563 
564 	/* clone a fid to use for creation */
565 	ofid = p9_client_walk(dfid, 0, NULL, 1);
566 	if (IS_ERR(ofid)) {
567 		err = PTR_ERR(ofid);
568 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
569 		return ERR_PTR(err);
570 	}
571 
572 	err = p9_client_fcreate(ofid, name, perm, mode, extension);
573 	if (err < 0) {
574 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
575 		goto error;
576 	}
577 
578 	/* now walk from the parent so we can get unopened fid */
579 	fid = p9_client_walk(dfid, 1, &name, 1);
580 	if (IS_ERR(fid)) {
581 		err = PTR_ERR(fid);
582 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
583 		fid = NULL;
584 		goto error;
585 	}
586 
587 	/* instantiate inode and assign the unopened fid to the dentry */
588 	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
589 	if (IS_ERR(inode)) {
590 		err = PTR_ERR(inode);
591 		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
592 		goto error;
593 	}
594 	d_instantiate(dentry, inode);
595 	err = v9fs_fid_add(dentry, fid);
596 	if (err < 0)
597 		goto error;
598 
599 	return ofid;
600 
601 error:
602 	if (ofid)
603 		p9_client_clunk(ofid);
604 
605 	if (fid)
606 		p9_client_clunk(fid);
607 
608 	return ERR_PTR(err);
609 }
610 
611 /**
612  * v9fs_vfs_create - VFS hook to create files
613  * @dir: directory inode that is being created
614  * @dentry:  dentry that is being deleted
615  * @mode: create permissions
616  * @nd: path information
617  *
618  */
619 
620 static int
621 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
622 		struct nameidata *nd)
623 {
624 	int err;
625 	u32 perm;
626 	int flags;
627 	struct file *filp;
628 	struct v9fs_inode *v9inode;
629 	struct v9fs_session_info *v9ses;
630 	struct p9_fid *fid, *inode_fid;
631 
632 	err = 0;
633 	fid = NULL;
634 	v9ses = v9fs_inode2v9ses(dir);
635 	perm = unixmode2p9mode(v9ses, mode);
636 	if (nd && nd->flags & LOOKUP_OPEN)
637 		flags = nd->intent.open.flags - 1;
638 	else
639 		flags = O_RDWR;
640 
641 	fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
642 				v9fs_uflags2omode(flags,
643 						v9fs_proto_dotu(v9ses)));
644 	if (IS_ERR(fid)) {
645 		err = PTR_ERR(fid);
646 		fid = NULL;
647 		goto error;
648 	}
649 
650 	v9fs_invalidate_inode_attr(dir);
651 	/* if we are opening a file, assign the open fid to the file */
652 	if (nd && nd->flags & LOOKUP_OPEN) {
653 		v9inode = V9FS_I(dentry->d_inode);
654 		mutex_lock(&v9inode->v_mutex);
655 		if (v9ses->cache && !v9inode->writeback_fid &&
656 		    ((flags & O_ACCMODE) != O_RDONLY)) {
657 			/*
658 			 * clone a fid and add it to writeback_fid
659 			 * we do it during open time instead of
660 			 * page dirty time via write_begin/page_mkwrite
661 			 * because we want write after unlink usecase
662 			 * to work.
663 			 */
664 			inode_fid = v9fs_writeback_fid(dentry);
665 			if (IS_ERR(inode_fid)) {
666 				err = PTR_ERR(inode_fid);
667 				mutex_unlock(&v9inode->v_mutex);
668 				goto error;
669 			}
670 			v9inode->writeback_fid = (void *) inode_fid;
671 		}
672 		mutex_unlock(&v9inode->v_mutex);
673 		filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
674 		if (IS_ERR(filp)) {
675 			err = PTR_ERR(filp);
676 			goto error;
677 		}
678 
679 		filp->private_data = fid;
680 #ifdef CONFIG_9P_FSCACHE
681 		if (v9ses->cache)
682 			v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
683 #endif
684 	} else
685 		p9_client_clunk(fid);
686 
687 	return 0;
688 
689 error:
690 	if (fid)
691 		p9_client_clunk(fid);
692 
693 	return err;
694 }
695 
696 /**
697  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
698  * @dir:  inode that is being unlinked
699  * @dentry: dentry that is being unlinked
700  * @mode: mode for new directory
701  *
702  */
703 
704 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
705 {
706 	int err;
707 	u32 perm;
708 	struct p9_fid *fid;
709 	struct v9fs_session_info *v9ses;
710 
711 	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
712 	err = 0;
713 	v9ses = v9fs_inode2v9ses(dir);
714 	perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
715 	fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
716 	if (IS_ERR(fid)) {
717 		err = PTR_ERR(fid);
718 		fid = NULL;
719 	} else {
720 		inc_nlink(dir);
721 		v9fs_invalidate_inode_attr(dir);
722 	}
723 
724 	if (fid)
725 		p9_client_clunk(fid);
726 
727 	return err;
728 }
729 
730 /**
731  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
732  * @dir:  inode that is being walked from
733  * @dentry: dentry that is being walked to?
734  * @nameidata: path data
735  *
736  */
737 
738 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
739 				      struct nameidata *nameidata)
740 {
741 	struct super_block *sb;
742 	struct v9fs_session_info *v9ses;
743 	struct p9_fid *dfid, *fid;
744 	struct inode *inode;
745 	char *name;
746 	int result = 0;
747 
748 	P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
749 		dir, dentry->d_name.name, dentry, nameidata);
750 
751 	if (dentry->d_name.len > NAME_MAX)
752 		return ERR_PTR(-ENAMETOOLONG);
753 
754 	sb = dir->i_sb;
755 	v9ses = v9fs_inode2v9ses(dir);
756 	/* We can walk d_parent because we hold the dir->i_mutex */
757 	dfid = v9fs_fid_lookup(dentry->d_parent);
758 	if (IS_ERR(dfid))
759 		return ERR_CAST(dfid);
760 
761 	name = (char *) dentry->d_name.name;
762 	fid = p9_client_walk(dfid, 1, &name, 1);
763 	if (IS_ERR(fid)) {
764 		result = PTR_ERR(fid);
765 		if (result == -ENOENT) {
766 			inode = NULL;
767 			goto inst_out;
768 		}
769 
770 		return ERR_PTR(result);
771 	}
772 
773 	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
774 	if (IS_ERR(inode)) {
775 		result = PTR_ERR(inode);
776 		inode = NULL;
777 		goto error;
778 	}
779 
780 	result = v9fs_fid_add(dentry, fid);
781 	if (result < 0)
782 		goto error_iput;
783 
784 inst_out:
785 	d_add(dentry, inode);
786 	return NULL;
787 
788 error_iput:
789 	iput(inode);
790 error:
791 	p9_client_clunk(fid);
792 
793 	return ERR_PTR(result);
794 }
795 
796 /**
797  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
798  * @i:  inode that is being unlinked
799  * @d: dentry that is being unlinked
800  *
801  */
802 
803 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
804 {
805 	return v9fs_remove(i, d, 0);
806 }
807 
808 /**
809  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
810  * @i:  inode that is being unlinked
811  * @d: dentry that is being unlinked
812  *
813  */
814 
815 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
816 {
817 	return v9fs_remove(i, d, 1);
818 }
819 
820 /**
821  * v9fs_vfs_rename - VFS hook to rename an inode
822  * @old_dir:  old dir inode
823  * @old_dentry: old dentry
824  * @new_dir: new dir inode
825  * @new_dentry: new dentry
826  *
827  */
828 
829 int
830 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
831 		struct inode *new_dir, struct dentry *new_dentry)
832 {
833 	int retval;
834 	struct inode *old_inode;
835 	struct inode *new_inode;
836 	struct v9fs_session_info *v9ses;
837 	struct p9_fid *oldfid;
838 	struct p9_fid *olddirfid;
839 	struct p9_fid *newdirfid;
840 	struct p9_wstat wstat;
841 
842 	P9_DPRINTK(P9_DEBUG_VFS, "\n");
843 	retval = 0;
844 	old_inode = old_dentry->d_inode;
845 	new_inode = new_dentry->d_inode;
846 	v9ses = v9fs_inode2v9ses(old_inode);
847 	oldfid = v9fs_fid_lookup(old_dentry);
848 	if (IS_ERR(oldfid))
849 		return PTR_ERR(oldfid);
850 
851 	olddirfid = v9fs_fid_clone(old_dentry->d_parent);
852 	if (IS_ERR(olddirfid)) {
853 		retval = PTR_ERR(olddirfid);
854 		goto done;
855 	}
856 
857 	newdirfid = v9fs_fid_clone(new_dentry->d_parent);
858 	if (IS_ERR(newdirfid)) {
859 		retval = PTR_ERR(newdirfid);
860 		goto clunk_olddir;
861 	}
862 
863 	down_write(&v9ses->rename_sem);
864 	if (v9fs_proto_dotl(v9ses)) {
865 		retval = p9_client_rename(oldfid, newdirfid,
866 					(char *) new_dentry->d_name.name);
867 		if (retval != -ENOSYS)
868 			goto clunk_newdir;
869 	}
870 	if (old_dentry->d_parent != new_dentry->d_parent) {
871 		/*
872 		 * 9P .u can only handle file rename in the same directory
873 		 */
874 
875 		P9_DPRINTK(P9_DEBUG_ERROR,
876 				"old dir and new dir are different\n");
877 		retval = -EXDEV;
878 		goto clunk_newdir;
879 	}
880 	v9fs_blank_wstat(&wstat);
881 	wstat.muid = v9ses->uname;
882 	wstat.name = (char *) new_dentry->d_name.name;
883 	retval = p9_client_wstat(oldfid, &wstat);
884 
885 clunk_newdir:
886 	if (!retval) {
887 		if (new_inode) {
888 			if (S_ISDIR(new_inode->i_mode))
889 				clear_nlink(new_inode);
890 			else
891 				drop_nlink(new_inode);
892 			/*
893 			 * Work around vfs rename rehash bug with
894 			 * FS_RENAME_DOES_D_MOVE
895 			 */
896 			v9fs_invalidate_inode_attr(new_inode);
897 		}
898 		if (S_ISDIR(old_inode->i_mode)) {
899 			if (!new_inode)
900 				inc_nlink(new_dir);
901 			drop_nlink(old_dir);
902 		}
903 		v9fs_invalidate_inode_attr(old_inode);
904 		v9fs_invalidate_inode_attr(old_dir);
905 		v9fs_invalidate_inode_attr(new_dir);
906 
907 		/* successful rename */
908 		d_move(old_dentry, new_dentry);
909 	}
910 	up_write(&v9ses->rename_sem);
911 	p9_client_clunk(newdirfid);
912 
913 clunk_olddir:
914 	p9_client_clunk(olddirfid);
915 
916 done:
917 	return retval;
918 }
919 
920 /**
921  * v9fs_vfs_getattr - retrieve file metadata
922  * @mnt: mount information
923  * @dentry: file to get attributes on
924  * @stat: metadata structure to populate
925  *
926  */
927 
928 static int
929 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
930 		 struct kstat *stat)
931 {
932 	int err;
933 	struct v9fs_session_info *v9ses;
934 	struct p9_fid *fid;
935 	struct p9_wstat *st;
936 
937 	P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
938 	err = -EPERM;
939 	v9ses = v9fs_dentry2v9ses(dentry);
940 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
941 		generic_fillattr(dentry->d_inode, stat);
942 		return 0;
943 	}
944 	fid = v9fs_fid_lookup(dentry);
945 	if (IS_ERR(fid))
946 		return PTR_ERR(fid);
947 
948 	st = p9_client_stat(fid);
949 	if (IS_ERR(st))
950 		return PTR_ERR(st);
951 
952 	v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
953 		generic_fillattr(dentry->d_inode, stat);
954 
955 	p9stat_free(st);
956 	kfree(st);
957 	return 0;
958 }
959 
960 /**
961  * v9fs_vfs_setattr - set file metadata
962  * @dentry: file whose metadata to set
963  * @iattr: metadata assignment structure
964  *
965  */
966 
967 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
968 {
969 	int retval;
970 	struct v9fs_session_info *v9ses;
971 	struct p9_fid *fid;
972 	struct p9_wstat wstat;
973 
974 	P9_DPRINTK(P9_DEBUG_VFS, "\n");
975 	retval = inode_change_ok(dentry->d_inode, iattr);
976 	if (retval)
977 		return retval;
978 
979 	retval = -EPERM;
980 	v9ses = v9fs_dentry2v9ses(dentry);
981 	fid = v9fs_fid_lookup(dentry);
982 	if(IS_ERR(fid))
983 		return PTR_ERR(fid);
984 
985 	v9fs_blank_wstat(&wstat);
986 	if (iattr->ia_valid & ATTR_MODE)
987 		wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
988 
989 	if (iattr->ia_valid & ATTR_MTIME)
990 		wstat.mtime = iattr->ia_mtime.tv_sec;
991 
992 	if (iattr->ia_valid & ATTR_ATIME)
993 		wstat.atime = iattr->ia_atime.tv_sec;
994 
995 	if (iattr->ia_valid & ATTR_SIZE)
996 		wstat.length = iattr->ia_size;
997 
998 	if (v9fs_proto_dotu(v9ses)) {
999 		if (iattr->ia_valid & ATTR_UID)
1000 			wstat.n_uid = iattr->ia_uid;
1001 
1002 		if (iattr->ia_valid & ATTR_GID)
1003 			wstat.n_gid = iattr->ia_gid;
1004 	}
1005 
1006 	/* Write all dirty data */
1007 	if (S_ISREG(dentry->d_inode->i_mode))
1008 		filemap_write_and_wait(dentry->d_inode->i_mapping);
1009 
1010 	retval = p9_client_wstat(fid, &wstat);
1011 	if (retval < 0)
1012 		return retval;
1013 
1014 	if ((iattr->ia_valid & ATTR_SIZE) &&
1015 	    iattr->ia_size != i_size_read(dentry->d_inode))
1016 		truncate_setsize(dentry->d_inode, iattr->ia_size);
1017 
1018 	v9fs_invalidate_inode_attr(dentry->d_inode);
1019 
1020 	setattr_copy(dentry->d_inode, iattr);
1021 	mark_inode_dirty(dentry->d_inode);
1022 	return 0;
1023 }
1024 
1025 /**
1026  * v9fs_stat2inode - populate an inode structure with mistat info
1027  * @stat: Plan 9 metadata (mistat) structure
1028  * @inode: inode to populate
1029  * @sb: superblock of filesystem
1030  *
1031  */
1032 
1033 void
1034 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1035 	struct super_block *sb)
1036 {
1037 	char ext[32];
1038 	char tag_name[14];
1039 	unsigned int i_nlink;
1040 	struct v9fs_session_info *v9ses = sb->s_fs_info;
1041 	struct v9fs_inode *v9inode = V9FS_I(inode);
1042 
1043 	inode->i_nlink = 1;
1044 
1045 	inode->i_atime.tv_sec = stat->atime;
1046 	inode->i_mtime.tv_sec = stat->mtime;
1047 	inode->i_ctime.tv_sec = stat->mtime;
1048 
1049 	inode->i_uid = v9ses->dfltuid;
1050 	inode->i_gid = v9ses->dfltgid;
1051 
1052 	if (v9fs_proto_dotu(v9ses)) {
1053 		inode->i_uid = stat->n_uid;
1054 		inode->i_gid = stat->n_gid;
1055 	}
1056 	if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1057 		if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1058 			/*
1059 			 * Hadlink support got added later to
1060 			 * to the .u extension. So there can be
1061 			 * server out there that doesn't support
1062 			 * this even with .u extension. So check
1063 			 * for non NULL stat->extension
1064 			 */
1065 			strncpy(ext, stat->extension, sizeof(ext));
1066 			/* HARDLINKCOUNT %u */
1067 			sscanf(ext, "%13s %u", tag_name, &i_nlink);
1068 			if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1069 				inode->i_nlink = i_nlink;
1070 		}
1071 	}
1072 	inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
1073 	if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1074 		char type = 0;
1075 		int major = -1;
1076 		int minor = -1;
1077 
1078 		strncpy(ext, stat->extension, sizeof(ext));
1079 		sscanf(ext, "%c %u %u", &type, &major, &minor);
1080 		switch (type) {
1081 		case 'c':
1082 			inode->i_mode &= ~S_IFBLK;
1083 			inode->i_mode |= S_IFCHR;
1084 			break;
1085 		case 'b':
1086 			break;
1087 		default:
1088 			P9_DPRINTK(P9_DEBUG_ERROR,
1089 				"Unknown special type %c %s\n", type,
1090 				stat->extension);
1091 		};
1092 		inode->i_rdev = MKDEV(major, minor);
1093 		init_special_inode(inode, inode->i_mode, inode->i_rdev);
1094 	} else
1095 		inode->i_rdev = 0;
1096 
1097 	i_size_write(inode, stat->length);
1098 
1099 	/* not real number of blocks, but 512 byte ones ... */
1100 	inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1101 	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1102 }
1103 
1104 /**
1105  * v9fs_qid2ino - convert qid into inode number
1106  * @qid: qid to hash
1107  *
1108  * BUG: potential for inode number collisions?
1109  */
1110 
1111 ino_t v9fs_qid2ino(struct p9_qid *qid)
1112 {
1113 	u64 path = qid->path + 2;
1114 	ino_t i = 0;
1115 
1116 	if (sizeof(ino_t) == sizeof(path))
1117 		memcpy(&i, &path, sizeof(ino_t));
1118 	else
1119 		i = (ino_t) (path ^ (path >> 32));
1120 
1121 	return i;
1122 }
1123 
1124 /**
1125  * v9fs_readlink - read a symlink's location (internal version)
1126  * @dentry: dentry for symlink
1127  * @buffer: buffer to load symlink location into
1128  * @buflen: length of buffer
1129  *
1130  */
1131 
1132 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1133 {
1134 	int retval;
1135 
1136 	struct v9fs_session_info *v9ses;
1137 	struct p9_fid *fid;
1138 	struct p9_wstat *st;
1139 
1140 	P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1141 	retval = -EPERM;
1142 	v9ses = v9fs_dentry2v9ses(dentry);
1143 	fid = v9fs_fid_lookup(dentry);
1144 	if (IS_ERR(fid))
1145 		return PTR_ERR(fid);
1146 
1147 	if (!v9fs_proto_dotu(v9ses))
1148 		return -EBADF;
1149 
1150 	st = p9_client_stat(fid);
1151 	if (IS_ERR(st))
1152 		return PTR_ERR(st);
1153 
1154 	if (!(st->mode & P9_DMSYMLINK)) {
1155 		retval = -EINVAL;
1156 		goto done;
1157 	}
1158 
1159 	/* copy extension buffer into buffer */
1160 	strncpy(buffer, st->extension, buflen);
1161 
1162 	P9_DPRINTK(P9_DEBUG_VFS,
1163 		"%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1164 
1165 	retval = strnlen(buffer, buflen);
1166 done:
1167 	p9stat_free(st);
1168 	kfree(st);
1169 	return retval;
1170 }
1171 
1172 /**
1173  * v9fs_vfs_follow_link - follow a symlink path
1174  * @dentry: dentry for symlink
1175  * @nd: nameidata
1176  *
1177  */
1178 
1179 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1180 {
1181 	int len = 0;
1182 	char *link = __getname();
1183 
1184 	P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1185 
1186 	if (!link)
1187 		link = ERR_PTR(-ENOMEM);
1188 	else {
1189 		len = v9fs_readlink(dentry, link, PATH_MAX);
1190 
1191 		if (len < 0) {
1192 			__putname(link);
1193 			link = ERR_PTR(len);
1194 		} else
1195 			link[min(len, PATH_MAX-1)] = 0;
1196 	}
1197 	nd_set_link(nd, link);
1198 
1199 	return NULL;
1200 }
1201 
1202 /**
1203  * v9fs_vfs_put_link - release a symlink path
1204  * @dentry: dentry for symlink
1205  * @nd: nameidata
1206  * @p: unused
1207  *
1208  */
1209 
1210 void
1211 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1212 {
1213 	char *s = nd_get_link(nd);
1214 
1215 	P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1216 		IS_ERR(s) ? "<error>" : s);
1217 	if (!IS_ERR(s))
1218 		__putname(s);
1219 }
1220 
1221 /**
1222  * v9fs_vfs_mkspecial - create a special file
1223  * @dir: inode to create special file in
1224  * @dentry: dentry to create
1225  * @mode: mode to create special file
1226  * @extension: 9p2000.u format extension string representing special file
1227  *
1228  */
1229 
1230 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1231 	int mode, const char *extension)
1232 {
1233 	u32 perm;
1234 	struct p9_fid *fid;
1235 	struct v9fs_session_info *v9ses;
1236 
1237 	v9ses = v9fs_inode2v9ses(dir);
1238 	if (!v9fs_proto_dotu(v9ses)) {
1239 		P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1240 		return -EPERM;
1241 	}
1242 
1243 	perm = unixmode2p9mode(v9ses, mode);
1244 	fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1245 								P9_OREAD);
1246 	if (IS_ERR(fid))
1247 		return PTR_ERR(fid);
1248 
1249 	v9fs_invalidate_inode_attr(dir);
1250 	p9_client_clunk(fid);
1251 	return 0;
1252 }
1253 
1254 /**
1255  * v9fs_vfs_symlink - helper function to create symlinks
1256  * @dir: directory inode containing symlink
1257  * @dentry: dentry for symlink
1258  * @symname: symlink data
1259  *
1260  * See Also: 9P2000.u RFC for more information
1261  *
1262  */
1263 
1264 static int
1265 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1266 {
1267 	P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1268 					dentry->d_name.name, symname);
1269 
1270 	return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1271 }
1272 
1273 /**
1274  * v9fs_vfs_link - create a hardlink
1275  * @old_dentry: dentry for file to link to
1276  * @dir: inode destination for new link
1277  * @dentry: dentry for link
1278  *
1279  */
1280 
1281 static int
1282 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1283 	      struct dentry *dentry)
1284 {
1285 	int retval;
1286 	char *name;
1287 	struct p9_fid *oldfid;
1288 
1289 	P9_DPRINTK(P9_DEBUG_VFS,
1290 		" %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1291 		old_dentry->d_name.name);
1292 
1293 	oldfid = v9fs_fid_clone(old_dentry);
1294 	if (IS_ERR(oldfid))
1295 		return PTR_ERR(oldfid);
1296 
1297 	name = __getname();
1298 	if (unlikely(!name)) {
1299 		retval = -ENOMEM;
1300 		goto clunk_fid;
1301 	}
1302 
1303 	sprintf(name, "%d\n", oldfid->fid);
1304 	retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1305 	__putname(name);
1306 	if (!retval) {
1307 		v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1308 		v9fs_invalidate_inode_attr(dir);
1309 	}
1310 clunk_fid:
1311 	p9_client_clunk(oldfid);
1312 	return retval;
1313 }
1314 
1315 /**
1316  * v9fs_vfs_mknod - create a special file
1317  * @dir: inode destination for new link
1318  * @dentry: dentry for file
1319  * @mode: mode for creation
1320  * @rdev: device associated with special file
1321  *
1322  */
1323 
1324 static int
1325 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1326 {
1327 	int retval;
1328 	char *name;
1329 
1330 	P9_DPRINTK(P9_DEBUG_VFS,
1331 		" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1332 		dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1333 
1334 	if (!new_valid_dev(rdev))
1335 		return -EINVAL;
1336 
1337 	name = __getname();
1338 	if (!name)
1339 		return -ENOMEM;
1340 	/* build extension */
1341 	if (S_ISBLK(mode))
1342 		sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1343 	else if (S_ISCHR(mode))
1344 		sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1345 	else if (S_ISFIFO(mode))
1346 		*name = 0;
1347 	else if (S_ISSOCK(mode))
1348 		*name = 0;
1349 	else {
1350 		__putname(name);
1351 		return -EINVAL;
1352 	}
1353 
1354 	retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1355 	__putname(name);
1356 
1357 	return retval;
1358 }
1359 
1360 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1361 {
1362 	loff_t i_size;
1363 	struct p9_wstat *st;
1364 	struct v9fs_session_info *v9ses;
1365 
1366 	v9ses = v9fs_inode2v9ses(inode);
1367 	st = p9_client_stat(fid);
1368 	if (IS_ERR(st))
1369 		return PTR_ERR(st);
1370 
1371 	spin_lock(&inode->i_lock);
1372 	/*
1373 	 * We don't want to refresh inode->i_size,
1374 	 * because we may have cached data
1375 	 */
1376 	i_size = inode->i_size;
1377 	v9fs_stat2inode(st, inode, inode->i_sb);
1378 	if (v9ses->cache)
1379 		inode->i_size = i_size;
1380 	spin_unlock(&inode->i_lock);
1381 	p9stat_free(st);
1382 	kfree(st);
1383 	return 0;
1384 }
1385 
1386 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1387 	.create = v9fs_vfs_create,
1388 	.lookup = v9fs_vfs_lookup,
1389 	.symlink = v9fs_vfs_symlink,
1390 	.link = v9fs_vfs_link,
1391 	.unlink = v9fs_vfs_unlink,
1392 	.mkdir = v9fs_vfs_mkdir,
1393 	.rmdir = v9fs_vfs_rmdir,
1394 	.mknod = v9fs_vfs_mknod,
1395 	.rename = v9fs_vfs_rename,
1396 	.getattr = v9fs_vfs_getattr,
1397 	.setattr = v9fs_vfs_setattr,
1398 };
1399 
1400 static const struct inode_operations v9fs_dir_inode_operations = {
1401 	.create = v9fs_vfs_create,
1402 	.lookup = v9fs_vfs_lookup,
1403 	.unlink = v9fs_vfs_unlink,
1404 	.mkdir = v9fs_vfs_mkdir,
1405 	.rmdir = v9fs_vfs_rmdir,
1406 	.mknod = v9fs_vfs_mknod,
1407 	.rename = v9fs_vfs_rename,
1408 	.getattr = v9fs_vfs_getattr,
1409 	.setattr = v9fs_vfs_setattr,
1410 };
1411 
1412 static const struct inode_operations v9fs_file_inode_operations = {
1413 	.getattr = v9fs_vfs_getattr,
1414 	.setattr = v9fs_vfs_setattr,
1415 };
1416 
1417 static const struct inode_operations v9fs_symlink_inode_operations = {
1418 	.readlink = generic_readlink,
1419 	.follow_link = v9fs_vfs_follow_link,
1420 	.put_link = v9fs_vfs_put_link,
1421 	.getattr = v9fs_vfs_getattr,
1422 	.setattr = v9fs_vfs_setattr,
1423 };
1424 
1425