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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / 9p / vfs_inode.c
blob4e65aa903345da5a7e63f5e49fb53f1204ee579e
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/file.h>
32 #include <linux/pagemap.h>
33 #include <linux/stat.h>
34 #include <linux/string.h>
35 #include <linux/inet.h>
36 #include <linux/namei.h>
37 #include <linux/idr.h>
38 #include <linux/sched.h>
39 #include <linux/slab.h>
40 #include <linux/xattr.h>
41 #include <linux/posix_acl.h>
42 #include <net/9p/9p.h>
43 #include <net/9p/client.h>
44
45 #include "v9fs.h"
46 #include "v9fs_vfs.h"
47 #include "fid.h"
48 #include "cache.h"
49 #include "xattr.h"
50 #include "acl.h"
51
52 static const struct inode_operations v9fs_dir_inode_operations;
53 static const struct inode_operations v9fs_dir_inode_operations_dotu;
54 static const struct inode_operations v9fs_file_inode_operations;
55 static const struct inode_operations v9fs_symlink_inode_operations;
56
57 /**
58 * unixmode2p9mode - convert unix mode bits to plan 9
59 * @v9ses: v9fs session information
60 * @mode: mode to convert
61 *
62 */
63
64 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
65 {
66 int res;
67 res = mode & 0777;
68 if (S_ISDIR(mode))
69 res |= P9_DMDIR;
70 if (v9fs_proto_dotu(v9ses)) {
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 }
89 return res;
90 }
91
92 /**
93 * p9mode2perm- convert plan9 mode bits to unix permission bits
94 * @v9ses: v9fs session information
95 * @stat: p9_wstat from which mode need to be derived
96 *
97 */
98 static int p9mode2perm(struct v9fs_session_info *v9ses,
99 struct p9_wstat *stat)
100 {
101 int res;
102 int mode = stat->mode;
103
104 res = mode & S_IALLUGO;
105 if (v9fs_proto_dotu(v9ses)) {
106 if ((mode & P9_DMSETUID) == P9_DMSETUID)
107 res |= S_ISUID;
108
109 if ((mode & P9_DMSETGID) == P9_DMSETGID)
110 res |= S_ISGID;
111
112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
113 res |= S_ISVTX;
114 }
115 return res;
116 }
117
118 /**
119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
120 * @v9ses: v9fs session information
121 * @stat: p9_wstat from which mode need to be derived
122 * @rdev: major number, minor number in case of device files.
123 *
124 */
125 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
126 struct p9_wstat *stat, dev_t *rdev)
127 {
128 int res;
129 u32 mode = stat->mode;
130
131 *rdev = 0;
132 res = p9mode2perm(v9ses, stat);
133
134 if ((mode & P9_DMDIR) == P9_DMDIR)
135 res |= S_IFDIR;
136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
137 res |= S_IFLNK;
138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
139 && (v9ses->nodev == 0))
140 res |= S_IFSOCK;
141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
142 && (v9ses->nodev == 0))
143 res |= S_IFIFO;
144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
145 && (v9ses->nodev == 0)) {
146 char type = 0, ext[32];
147 int major = -1, minor = -1;
148
149 strlcpy(ext, stat->extension, sizeof(ext));
150 sscanf(ext, "%c %u %u", &type, &major, &minor);
151 switch (type) {
152 case 'c':
153 res |= S_IFCHR;
154 break;
155 case 'b':
156 res |= S_IFBLK;
157 break;
158 default:
159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
160 type, stat->extension);
161 };
162 *rdev = MKDEV(major, minor);
163 } else
164 res |= S_IFREG;
165
166 return res;
167 }
168
169 /**
170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
171 * @uflags: flags to convert
172 * @extended: if .u extensions are active
173 */
174
175 int v9fs_uflags2omode(int uflags, int extended)
176 {
177 int ret;
178
179 ret = 0;
180 switch (uflags&3) {
181 default:
182 case O_RDONLY:
183 ret = P9_OREAD;
184 break;
185
186 case O_WRONLY:
187 ret = P9_OWRITE;
188 break;
189
190 case O_RDWR:
191 ret = P9_ORDWR;
192 break;
193 }
194
195 if (extended) {
196 if (uflags & O_EXCL)
197 ret |= P9_OEXCL;
198
199 if (uflags & O_APPEND)
200 ret |= P9_OAPPEND;
201 }
202
203 return ret;
204 }
205
206 /**
207 * v9fs_blank_wstat - helper function to setup a 9P stat structure
208 * @wstat: structure to initialize
209 *
210 */
211
212 void
213 v9fs_blank_wstat(struct p9_wstat *wstat)
214 {
215 wstat->type = ~0;
216 wstat->dev = ~0;
217 wstat->qid.type = ~0;
218 wstat->qid.version = ~0;
219 *((long long *)&wstat->qid.path) = ~0;
220 wstat->mode = ~0;
221 wstat->atime = ~0;
222 wstat->mtime = ~0;
223 wstat->length = ~0;
224 wstat->name = NULL;
225 wstat->uid = NULL;
226 wstat->gid = NULL;
227 wstat->muid = NULL;
228 wstat->n_uid = INVALID_UID;
229 wstat->n_gid = INVALID_GID;
230 wstat->n_muid = INVALID_UID;
231 wstat->extension = NULL;
232 }
233
234 /**
235 * v9fs_alloc_inode - helper function to allocate an inode
236 *
237 */
238 struct inode *v9fs_alloc_inode(struct super_block *sb)
239 {
240 struct v9fs_inode *v9inode;
241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
242 GFP_KERNEL);
243 if (!v9inode)
244 return NULL;
245 #ifdef CONFIG_9P_FSCACHE
246 v9inode->fscache = NULL;
247 spin_lock_init(&v9inode->fscache_lock);
248 #endif
249 v9inode->writeback_fid = NULL;
250 v9inode->cache_validity = 0;
251 mutex_init(&v9inode->v_mutex);
252 return &v9inode->vfs_inode;
253 }
254
255 /**
256 * v9fs_destroy_inode - destroy an inode
257 *
258 */
259
260 static void v9fs_i_callback(struct rcu_head *head)
261 {
262 struct inode *inode = container_of(head, struct inode, i_rcu);
263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
264 }
265
266 void v9fs_destroy_inode(struct inode *inode)
267 {
268 call_rcu(&inode->i_rcu, v9fs_i_callback);
269 }
270
271 int v9fs_init_inode(struct v9fs_session_info *v9ses,
272 struct inode *inode, umode_t mode, dev_t rdev)
273 {
274 int err = 0;
275
276 inode_init_owner(inode, NULL, mode);
277 inode->i_blocks = 0;
278 inode->i_rdev = rdev;
279 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
280 inode->i_mapping->a_ops = &v9fs_addr_operations;
281
282 switch (mode & S_IFMT) {
283 case S_IFIFO:
284 case S_IFBLK:
285 case S_IFCHR:
286 case S_IFSOCK:
287 if (v9fs_proto_dotl(v9ses)) {
288 inode->i_op = &v9fs_file_inode_operations_dotl;
289 } else if (v9fs_proto_dotu(v9ses)) {
290 inode->i_op = &v9fs_file_inode_operations;
291 } else {
292 p9_debug(P9_DEBUG_ERROR,
293 "special files without extended mode\n");
294 err = -EINVAL;
295 goto error;
296 }
297 init_special_inode(inode, inode->i_mode, inode->i_rdev);
298 break;
299 case S_IFREG:
300 if (v9fs_proto_dotl(v9ses)) {
301 inode->i_op = &v9fs_file_inode_operations_dotl;
302 if (v9ses->cache)
303 inode->i_fop =
304 &v9fs_cached_file_operations_dotl;
305 else
306 inode->i_fop = &v9fs_file_operations_dotl;
307 } else {
308 inode->i_op = &v9fs_file_inode_operations;
309 if (v9ses->cache)
310 inode->i_fop = &v9fs_cached_file_operations;
311 else
312 inode->i_fop = &v9fs_file_operations;
313 }
314
315 break;
316 case S_IFLNK:
317 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
318 p9_debug(P9_DEBUG_ERROR,
319 "extended modes used with legacy protocol\n");
320 err = -EINVAL;
321 goto error;
322 }
323
324 if (v9fs_proto_dotl(v9ses))
325 inode->i_op = &v9fs_symlink_inode_operations_dotl;
326 else
327 inode->i_op = &v9fs_symlink_inode_operations;
328
329 break;
330 case S_IFDIR:
331 inc_nlink(inode);
332 if (v9fs_proto_dotl(v9ses))
333 inode->i_op = &v9fs_dir_inode_operations_dotl;
334 else if (v9fs_proto_dotu(v9ses))
335 inode->i_op = &v9fs_dir_inode_operations_dotu;
336 else
337 inode->i_op = &v9fs_dir_inode_operations;
338
339 if (v9fs_proto_dotl(v9ses))
340 inode->i_fop = &v9fs_dir_operations_dotl;
341 else
342 inode->i_fop = &v9fs_dir_operations;
343
344 break;
345 default:
346 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
347 mode, mode & S_IFMT);
348 err = -EINVAL;
349 goto error;
350 }
351 error:
352 return err;
353
354 }
355
356 /**
357 * v9fs_get_inode - helper function to setup an inode
358 * @sb: superblock
359 * @mode: mode to setup inode with
360 *
361 */
362
363 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
364 {
365 int err;
366 struct inode *inode;
367 struct v9fs_session_info *v9ses = sb->s_fs_info;
368
369 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
370
371 inode = new_inode(sb);
372 if (!inode) {
373 pr_warn("%s (%d): Problem allocating inode\n",
374 __func__, task_pid_nr(current));
375 return ERR_PTR(-ENOMEM);
376 }
377 err = v9fs_init_inode(v9ses, inode, mode, rdev);
378 if (err) {
379 iput(inode);
380 return ERR_PTR(err);
381 }
382 return inode;
383 }
384
385 /*
386 static struct v9fs_fid*
387 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
388 {
389 int err;
390 int nfid;
391 struct v9fs_fid *ret;
392 struct v9fs_fcall *fcall;
393
394 nfid = v9fs_get_idpool(&v9ses->fidpool);
395 if (nfid < 0) {
396 eprintk(KERN_WARNING, "no free fids available\n");
397 return ERR_PTR(-ENOSPC);
398 }
399
400 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
401 &fcall);
402
403 if (err < 0) {
404 if (fcall && fcall->id == RWALK)
405 goto clunk_fid;
406
407 PRINT_FCALL_ERROR("walk error", fcall);
408 v9fs_put_idpool(nfid, &v9ses->fidpool);
409 goto error;
410 }
411
412 kfree(fcall);
413 fcall = NULL;
414 ret = v9fs_fid_create(v9ses, nfid);
415 if (!ret) {
416 err = -ENOMEM;
417 goto clunk_fid;
418 }
419
420 err = v9fs_fid_insert(ret, dentry);
421 if (err < 0) {
422 v9fs_fid_destroy(ret);
423 goto clunk_fid;
424 }
425
426 return ret;
427
428 clunk_fid:
429 v9fs_t_clunk(v9ses, nfid);
430
431 error:
432 kfree(fcall);
433 return ERR_PTR(err);
434 }
435 */
436
437
438 /**
439 * v9fs_clear_inode - release an inode
440 * @inode: inode to release
441 *
442 */
443 void v9fs_evict_inode(struct inode *inode)
444 {
445 struct v9fs_inode *v9inode = V9FS_I(inode);
446
447 truncate_inode_pages(inode->i_mapping, 0);
448 clear_inode(inode);
449 filemap_fdatawrite(inode->i_mapping);
450
451 v9fs_cache_inode_put_cookie(inode);
452 /* clunk the fid stashed in writeback_fid */
453 if (v9inode->writeback_fid) {
454 p9_client_clunk(v9inode->writeback_fid);
455 v9inode->writeback_fid = NULL;
456 }
457 }
458
459 static int v9fs_test_inode(struct inode *inode, void *data)
460 {
461 int umode;
462 dev_t rdev;
463 struct v9fs_inode *v9inode = V9FS_I(inode);
464 struct p9_wstat *st = (struct p9_wstat *)data;
465 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
466
467 umode = p9mode2unixmode(v9ses, st, &rdev);
468 /* don't match inode of different type */
469 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
470 return 0;
471
472 /* compare qid details */
473 if (memcmp(&v9inode->qid.version,
474 &st->qid.version, sizeof(v9inode->qid.version)))
475 return 0;
476
477 if (v9inode->qid.type != st->qid.type)
478 return 0;
479 return 1;
480 }
481
482 static int v9fs_test_new_inode(struct inode *inode, void *data)
483 {
484 return 0;
485 }
486
487 static int v9fs_set_inode(struct inode *inode, void *data)
488 {
489 struct v9fs_inode *v9inode = V9FS_I(inode);
490 struct p9_wstat *st = (struct p9_wstat *)data;
491
492 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
493 return 0;
494 }
495
496 static struct inode *v9fs_qid_iget(struct super_block *sb,
497 struct p9_qid *qid,
498 struct p9_wstat *st,
499 int new)
500 {
501 dev_t rdev;
502 int retval;
503 umode_t umode;
504 unsigned long i_ino;
505 struct inode *inode;
506 struct v9fs_session_info *v9ses = sb->s_fs_info;
507 int (*test)(struct inode *, void *);
508
509 if (new)
510 test = v9fs_test_new_inode;
511 else
512 test = v9fs_test_inode;
513
514 i_ino = v9fs_qid2ino(qid);
515 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
516 if (!inode)
517 return ERR_PTR(-ENOMEM);
518 if (!(inode->i_state & I_NEW))
519 return inode;
520 /*
521 * initialize the inode with the stat info
522 * FIXME!! we may need support for stale inodes
523 * later.
524 */
525 inode->i_ino = i_ino;
526 umode = p9mode2unixmode(v9ses, st, &rdev);
527 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
528 if (retval)
529 goto error;
530
531 v9fs_stat2inode(st, inode, sb);
532 v9fs_cache_inode_get_cookie(inode);
533 unlock_new_inode(inode);
534 return inode;
535 error:
536 unlock_new_inode(inode);
537 iput(inode);
538 return ERR_PTR(retval);
539
540 }
541
542 struct inode *
543 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
544 struct super_block *sb, int new)
545 {
546 struct p9_wstat *st;
547 struct inode *inode = NULL;
548
549 st = p9_client_stat(fid);
550 if (IS_ERR(st))
551 return ERR_CAST(st);
552
553 inode = v9fs_qid_iget(sb, &st->qid, st, new);
554 p9stat_free(st);
555 kfree(st);
556 return inode;
557 }
558
559 /**
560 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
561 * plan 9 AT flag.
562 * @flags: flags to convert
563 */
564 static int v9fs_at_to_dotl_flags(int flags)
565 {
566 int rflags = 0;
567 if (flags & AT_REMOVEDIR)
568 rflags |= P9_DOTL_AT_REMOVEDIR;
569 return rflags;
570 }
571
572 /**
573 * v9fs_remove - helper function to remove files and directories
574 * @dir: directory inode that is being deleted
575 * @dentry: dentry that is being deleted
576 * @rmdir: removing a directory
577 *
578 */
579
580 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
581 {
582 struct inode *inode;
583 int retval = -EOPNOTSUPP;
584 struct p9_fid *v9fid, *dfid;
585 struct v9fs_session_info *v9ses;
586
587 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
588 dir, dentry, flags);
589
590 v9ses = v9fs_inode2v9ses(dir);
591 inode = dentry->d_inode;
592 dfid = v9fs_fid_lookup(dentry->d_parent);
593 if (IS_ERR(dfid)) {
594 retval = PTR_ERR(dfid);
595 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
596 return retval;
597 }
598 if (v9fs_proto_dotl(v9ses))
599 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
600 v9fs_at_to_dotl_flags(flags));
601 if (retval == -EOPNOTSUPP) {
602 /* Try the one based on path */
603 v9fid = v9fs_fid_clone(dentry);
604 if (IS_ERR(v9fid))
605 return PTR_ERR(v9fid);
606 retval = p9_client_remove(v9fid);
607 }
608 if (!retval) {
609 /*
610 * directories on unlink should have zero
611 * link count
612 */
613 if (flags & AT_REMOVEDIR) {
614 clear_nlink(inode);
615 drop_nlink(dir);
616 } else
617 drop_nlink(inode);
618
619 v9fs_invalidate_inode_attr(inode);
620 v9fs_invalidate_inode_attr(dir);
621 }
622 return retval;
623 }
624
625 /**
626 * v9fs_create - Create a file
627 * @v9ses: session information
628 * @dir: directory that dentry is being created in
629 * @dentry: dentry that is being created
630 * @extension: 9p2000.u extension string to support devices, etc.
631 * @perm: create permissions
632 * @mode: open mode
633 *
634 */
635 static struct p9_fid *
636 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
637 struct dentry *dentry, char *extension, u32 perm, u8 mode)
638 {
639 int err;
640 char *name;
641 struct p9_fid *dfid, *ofid, *fid;
642 struct inode *inode;
643
644 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
645
646 err = 0;
647 ofid = NULL;
648 fid = NULL;
649 name = (char *) dentry->d_name.name;
650 dfid = v9fs_fid_lookup(dentry->d_parent);
651 if (IS_ERR(dfid)) {
652 err = PTR_ERR(dfid);
653 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
654 return ERR_PTR(err);
655 }
656
657 /* clone a fid to use for creation */
658 ofid = p9_client_walk(dfid, 0, NULL, 1);
659 if (IS_ERR(ofid)) {
660 err = PTR_ERR(ofid);
661 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
662 return ERR_PTR(err);
663 }
664
665 err = p9_client_fcreate(ofid, name, perm, mode, extension);
666 if (err < 0) {
667 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
668 goto error;
669 }
670
671 if (!(perm & P9_DMLINK)) {
672 /* now walk from the parent so we can get unopened fid */
673 fid = p9_client_walk(dfid, 1, &name, 1);
674 if (IS_ERR(fid)) {
675 err = PTR_ERR(fid);
676 p9_debug(P9_DEBUG_VFS,
677 "p9_client_walk failed %d\n", err);
678 fid = NULL;
679 goto error;
680 }
681 /*
682 * instantiate inode and assign the unopened fid to the dentry
683 */
684 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
685 if (IS_ERR(inode)) {
686 err = PTR_ERR(inode);
687 p9_debug(P9_DEBUG_VFS,
688 "inode creation failed %d\n", err);
689 goto error;
690 }
691 v9fs_fid_add(dentry, fid);
692 d_instantiate(dentry, inode);
693 }
694 return ofid;
695 error:
696 if (ofid)
697 p9_client_clunk(ofid);
698
699 if (fid)
700 p9_client_clunk(fid);
701
702 return ERR_PTR(err);
703 }
704
705 /**
706 * v9fs_vfs_create - VFS hook to create a regular file
707 *
708 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
709 * for mknod(2).
710 *
711 * @dir: directory inode that is being created
712 * @dentry: dentry that is being deleted
713 * @mode: create permissions
714 *
715 */
716
717 static int
718 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
719 bool excl)
720 {
721 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
722 u32 perm = unixmode2p9mode(v9ses, mode);
723 struct p9_fid *fid;
724
725 /* P9_OEXCL? */
726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
727 if (IS_ERR(fid))
728 return PTR_ERR(fid);
729
730 v9fs_invalidate_inode_attr(dir);
731 p9_client_clunk(fid);
732
733 return 0;
734 }
735
736 /**
737 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
738 * @dir: inode that is being unlinked
739 * @dentry: dentry that is being unlinked
740 * @mode: mode for new directory
741 *
742 */
743
744 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
745 {
746 int err;
747 u32 perm;
748 struct p9_fid *fid;
749 struct v9fs_session_info *v9ses;
750
751 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
752 err = 0;
753 v9ses = v9fs_inode2v9ses(dir);
754 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
755 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
756 if (IS_ERR(fid)) {
757 err = PTR_ERR(fid);
758 fid = NULL;
759 } else {
760 inc_nlink(dir);
761 v9fs_invalidate_inode_attr(dir);
762 }
763
764 if (fid)
765 p9_client_clunk(fid);
766
767 return err;
768 }
769
770 /**
771 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
772 * @dir: inode that is being walked from
773 * @dentry: dentry that is being walked to?
774 * @nameidata: path data
775 *
776 */
777
778 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
779 unsigned int flags)
780 {
781 struct dentry *res;
782 struct super_block *sb;
783 struct v9fs_session_info *v9ses;
784 struct p9_fid *dfid, *fid;
785 struct inode *inode;
786 char *name;
787
788 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n",
789 dir, dentry->d_name.name, dentry, flags);
790
791 if (dentry->d_name.len > NAME_MAX)
792 return ERR_PTR(-ENAMETOOLONG);
793
794 sb = dir->i_sb;
795 v9ses = v9fs_inode2v9ses(dir);
796 /* We can walk d_parent because we hold the dir->i_mutex */
797 dfid = v9fs_fid_lookup(dentry->d_parent);
798 if (IS_ERR(dfid))
799 return ERR_CAST(dfid);
800
801 name = (char *) dentry->d_name.name;
802 fid = p9_client_walk(dfid, 1, &name, 1);
803 if (IS_ERR(fid)) {
804 if (fid == ERR_PTR(-ENOENT)) {
805 d_add(dentry, NULL);
806 return NULL;
807 }
808 return ERR_CAST(fid);
809 }
810 /*
811 * Make sure we don't use a wrong inode due to parallel
812 * unlink. For cached mode create calls request for new
813 * inode. But with cache disabled, lookup should do this.
814 */
815 if (v9ses->cache)
816 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
817 else
818 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
819 if (IS_ERR(inode)) {
820 p9_client_clunk(fid);
821 return ERR_CAST(inode);
822 }
823 /*
824 * If we had a rename on the server and a parallel lookup
825 * for the new name, then make sure we instantiate with
826 * the new name. ie look up for a/b, while on server somebody
827 * moved b under k and client parallely did a lookup for
828 * k/b.
829 */
830 res = d_materialise_unique(dentry, inode);
831 if (!res)
832 v9fs_fid_add(dentry, fid);
833 else if (!IS_ERR(res))
834 v9fs_fid_add(res, fid);
835 else
836 p9_client_clunk(fid);
837 return res;
838 }
839
840 static int
841 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
842 struct file *file, unsigned flags, umode_t mode,
843 int *opened)
844 {
845 int err;
846 u32 perm;
847 struct v9fs_inode *v9inode;
848 struct v9fs_session_info *v9ses;
849 struct p9_fid *fid, *inode_fid;
850 struct dentry *res = NULL;
851
852 if (d_unhashed(dentry)) {
853 res = v9fs_vfs_lookup(dir, dentry, 0);
854 if (IS_ERR(res))
855 return PTR_ERR(res);
856
857 if (res)
858 dentry = res;
859 }
860
861 /* Only creates */
862 if (!(flags & O_CREAT) || dentry->d_inode)
863 return finish_no_open(file, res);
864
865 err = 0;
866 fid = NULL;
867 v9ses = v9fs_inode2v9ses(dir);
868 perm = unixmode2p9mode(v9ses, mode);
869 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
870 v9fs_uflags2omode(flags,
871 v9fs_proto_dotu(v9ses)));
872 if (IS_ERR(fid)) {
873 err = PTR_ERR(fid);
874 fid = NULL;
875 goto error;
876 }
877
878 v9fs_invalidate_inode_attr(dir);
879 v9inode = V9FS_I(dentry->d_inode);
880 mutex_lock(&v9inode->v_mutex);
881 if (v9ses->cache && !v9inode->writeback_fid &&
882 ((flags & O_ACCMODE) != O_RDONLY)) {
883 /*
884 * clone a fid and add it to writeback_fid
885 * we do it during open time instead of
886 * page dirty time via write_begin/page_mkwrite
887 * because we want write after unlink usecase
888 * to work.
889 */
890 inode_fid = v9fs_writeback_fid(dentry);
891 if (IS_ERR(inode_fid)) {
892 err = PTR_ERR(inode_fid);
893 mutex_unlock(&v9inode->v_mutex);
894 goto error;
895 }
896 v9inode->writeback_fid = (void *) inode_fid;
897 }
898 mutex_unlock(&v9inode->v_mutex);
899 err = finish_open(file, dentry, generic_file_open, opened);
900 if (err)
901 goto error;
902
903 file->private_data = fid;
904 if (v9ses->cache)
905 v9fs_cache_inode_set_cookie(dentry->d_inode, file);
906
907 *opened |= FILE_CREATED;
908 out:
909 dput(res);
910 return err;
911
912 error:
913 if (fid)
914 p9_client_clunk(fid);
915 goto out;
916 }
917
918 /**
919 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
920 * @i: inode that is being unlinked
921 * @d: dentry that is being unlinked
922 *
923 */
924
925 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
926 {
927 return v9fs_remove(i, d, 0);
928 }
929
930 /**
931 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
932 * @i: inode that is being unlinked
933 * @d: dentry that is being unlinked
934 *
935 */
936
937 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
938 {
939 return v9fs_remove(i, d, AT_REMOVEDIR);
940 }
941
942 /**
943 * v9fs_vfs_rename - VFS hook to rename an inode
944 * @old_dir: old dir inode
945 * @old_dentry: old dentry
946 * @new_dir: new dir inode
947 * @new_dentry: new dentry
948 *
949 */
950
951 int
952 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
953 struct inode *new_dir, struct dentry *new_dentry)
954 {
955 int retval;
956 struct inode *old_inode;
957 struct inode *new_inode;
958 struct v9fs_session_info *v9ses;
959 struct p9_fid *oldfid;
960 struct p9_fid *olddirfid;
961 struct p9_fid *newdirfid;
962 struct p9_wstat wstat;
963
964 p9_debug(P9_DEBUG_VFS, "\n");
965 retval = 0;
966 old_inode = old_dentry->d_inode;
967 new_inode = new_dentry->d_inode;
968 v9ses = v9fs_inode2v9ses(old_inode);
969 oldfid = v9fs_fid_lookup(old_dentry);
970 if (IS_ERR(oldfid))
971 return PTR_ERR(oldfid);
972
973 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
974 if (IS_ERR(olddirfid)) {
975 retval = PTR_ERR(olddirfid);
976 goto done;
977 }
978
979 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
980 if (IS_ERR(newdirfid)) {
981 retval = PTR_ERR(newdirfid);
982 goto clunk_olddir;
983 }
984
985 down_write(&v9ses->rename_sem);
986 if (v9fs_proto_dotl(v9ses)) {
987 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
988 newdirfid, new_dentry->d_name.name);
989 if (retval == -EOPNOTSUPP)
990 retval = p9_client_rename(oldfid, newdirfid,
991 new_dentry->d_name.name);
992 if (retval != -EOPNOTSUPP)
993 goto clunk_newdir;
994 }
995 if (old_dentry->d_parent != new_dentry->d_parent) {
996 /*
997 * 9P .u can only handle file rename in the same directory
998 */
999
1000 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
1001 retval = -EXDEV;
1002 goto clunk_newdir;
1003 }
1004 v9fs_blank_wstat(&wstat);
1005 wstat.muid = v9ses->uname;
1006 wstat.name = (char *) new_dentry->d_name.name;
1007 retval = p9_client_wstat(oldfid, &wstat);
1008
1009 clunk_newdir:
1010 if (!retval) {
1011 if (new_inode) {
1012 if (S_ISDIR(new_inode->i_mode))
1013 clear_nlink(new_inode);
1014 else
1015 drop_nlink(new_inode);
1016 }
1017 if (S_ISDIR(old_inode->i_mode)) {
1018 if (!new_inode)
1019 inc_nlink(new_dir);
1020 drop_nlink(old_dir);
1021 }
1022 v9fs_invalidate_inode_attr(old_inode);
1023 v9fs_invalidate_inode_attr(old_dir);
1024 v9fs_invalidate_inode_attr(new_dir);
1025
1026 /* successful rename */
1027 d_move(old_dentry, new_dentry);
1028 }
1029 up_write(&v9ses->rename_sem);
1030 p9_client_clunk(newdirfid);
1031
1032 clunk_olddir:
1033 p9_client_clunk(olddirfid);
1034
1035 done:
1036 return retval;
1037 }
1038
1039 /**
1040 * v9fs_vfs_getattr - retrieve file metadata
1041 * @mnt: mount information
1042 * @dentry: file to get attributes on
1043 * @stat: metadata structure to populate
1044 *
1045 */
1046
1047 static int
1048 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1049 struct kstat *stat)
1050 {
1051 struct v9fs_session_info *v9ses;
1052 struct p9_fid *fid;
1053 struct p9_wstat *st;
1054
1055 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1056 v9ses = v9fs_dentry2v9ses(dentry);
1057 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1058 generic_fillattr(dentry->d_inode, stat);
1059 return 0;
1060 }
1061 fid = v9fs_fid_lookup(dentry);
1062 if (IS_ERR(fid))
1063 return PTR_ERR(fid);
1064
1065 st = p9_client_stat(fid);
1066 if (IS_ERR(st))
1067 return PTR_ERR(st);
1068
1069 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1070 generic_fillattr(dentry->d_inode, stat);
1071
1072 p9stat_free(st);
1073 kfree(st);
1074 return 0;
1075 }
1076
1077 /**
1078 * v9fs_vfs_setattr - set file metadata
1079 * @dentry: file whose metadata to set
1080 * @iattr: metadata assignment structure
1081 *
1082 */
1083
1084 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1085 {
1086 int retval;
1087 struct v9fs_session_info *v9ses;
1088 struct p9_fid *fid;
1089 struct p9_wstat wstat;
1090
1091 p9_debug(P9_DEBUG_VFS, "\n");
1092 retval = inode_change_ok(dentry->d_inode, iattr);
1093 if (retval)
1094 return retval;
1095
1096 retval = -EPERM;
1097 v9ses = v9fs_dentry2v9ses(dentry);
1098 fid = v9fs_fid_lookup(dentry);
1099 if(IS_ERR(fid))
1100 return PTR_ERR(fid);
1101
1102 v9fs_blank_wstat(&wstat);
1103 if (iattr->ia_valid & ATTR_MODE)
1104 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1105
1106 if (iattr->ia_valid & ATTR_MTIME)
1107 wstat.mtime = iattr->ia_mtime.tv_sec;
1108
1109 if (iattr->ia_valid & ATTR_ATIME)
1110 wstat.atime = iattr->ia_atime.tv_sec;
1111
1112 if (iattr->ia_valid & ATTR_SIZE)
1113 wstat.length = iattr->ia_size;
1114
1115 if (v9fs_proto_dotu(v9ses)) {
1116 if (iattr->ia_valid & ATTR_UID)
1117 wstat.n_uid = iattr->ia_uid;
1118
1119 if (iattr->ia_valid & ATTR_GID)
1120 wstat.n_gid = iattr->ia_gid;
1121 }
1122
1123 /* Write all dirty data */
1124 if (S_ISREG(dentry->d_inode->i_mode))
1125 filemap_write_and_wait(dentry->d_inode->i_mapping);
1126
1127 retval = p9_client_wstat(fid, &wstat);
1128 if (retval < 0)
1129 return retval;
1130
1131 if ((iattr->ia_valid & ATTR_SIZE) &&
1132 iattr->ia_size != i_size_read(dentry->d_inode))
1133 truncate_setsize(dentry->d_inode, iattr->ia_size);
1134
1135 v9fs_invalidate_inode_attr(dentry->d_inode);
1136
1137 setattr_copy(dentry->d_inode, iattr);
1138 mark_inode_dirty(dentry->d_inode);
1139 return 0;
1140 }
1141
1142 /**
1143 * v9fs_stat2inode - populate an inode structure with mistat info
1144 * @stat: Plan 9 metadata (mistat) structure
1145 * @inode: inode to populate
1146 * @sb: superblock of filesystem
1147 *
1148 */
1149
1150 void
1151 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1152 struct super_block *sb)
1153 {
1154 umode_t mode;
1155 char ext[32];
1156 char tag_name[14];
1157 unsigned int i_nlink;
1158 struct v9fs_session_info *v9ses = sb->s_fs_info;
1159 struct v9fs_inode *v9inode = V9FS_I(inode);
1160
1161 set_nlink(inode, 1);
1162
1163 inode->i_atime.tv_sec = stat->atime;
1164 inode->i_mtime.tv_sec = stat->mtime;
1165 inode->i_ctime.tv_sec = stat->mtime;
1166
1167 inode->i_uid = v9ses->dfltuid;
1168 inode->i_gid = v9ses->dfltgid;
1169
1170 if (v9fs_proto_dotu(v9ses)) {
1171 inode->i_uid = stat->n_uid;
1172 inode->i_gid = stat->n_gid;
1173 }
1174 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1175 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1176 /*
1177 * Hadlink support got added later to
1178 * to the .u extension. So there can be
1179 * server out there that doesn't support
1180 * this even with .u extension. So check
1181 * for non NULL stat->extension
1182 */
1183 strlcpy(ext, stat->extension, sizeof(ext));
1184 /* HARDLINKCOUNT %u */
1185 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1186 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1187 set_nlink(inode, i_nlink);
1188 }
1189 }
1190 mode = p9mode2perm(v9ses, stat);
1191 mode |= inode->i_mode & ~S_IALLUGO;
1192 inode->i_mode = mode;
1193 i_size_write(inode, stat->length);
1194
1195 /* not real number of blocks, but 512 byte ones ... */
1196 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1197 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1198 }
1199
1200 /**
1201 * v9fs_qid2ino - convert qid into inode number
1202 * @qid: qid to hash
1203 *
1204 * BUG: potential for inode number collisions?
1205 */
1206
1207 ino_t v9fs_qid2ino(struct p9_qid *qid)
1208 {
1209 u64 path = qid->path + 2;
1210 ino_t i = 0;
1211
1212 if (sizeof(ino_t) == sizeof(path))
1213 memcpy(&i, &path, sizeof(ino_t));
1214 else
1215 i = (ino_t) (path ^ (path >> 32));
1216
1217 return i;
1218 }
1219
1220 /**
1221 * v9fs_readlink - read a symlink's location (internal version)
1222 * @dentry: dentry for symlink
1223 * @buffer: buffer to load symlink location into
1224 * @buflen: length of buffer
1225 *
1226 */
1227
1228 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1229 {
1230 int retval;
1231
1232 struct v9fs_session_info *v9ses;
1233 struct p9_fid *fid;
1234 struct p9_wstat *st;
1235
1236 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1237 retval = -EPERM;
1238 v9ses = v9fs_dentry2v9ses(dentry);
1239 fid = v9fs_fid_lookup(dentry);
1240 if (IS_ERR(fid))
1241 return PTR_ERR(fid);
1242
1243 if (!v9fs_proto_dotu(v9ses))
1244 return -EBADF;
1245
1246 st = p9_client_stat(fid);
1247 if (IS_ERR(st))
1248 return PTR_ERR(st);
1249
1250 if (!(st->mode & P9_DMSYMLINK)) {
1251 retval = -EINVAL;
1252 goto done;
1253 }
1254
1255 /* copy extension buffer into buffer */
1256 retval = min(strlen(st->extension)+1, (size_t)buflen);
1257 memcpy(buffer, st->extension, retval);
1258
1259 p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n",
1260 dentry->d_name.name, st->extension, buflen, buffer);
1261
1262 done:
1263 p9stat_free(st);
1264 kfree(st);
1265 return retval;
1266 }
1267
1268 /**
1269 * v9fs_vfs_follow_link - follow a symlink path
1270 * @dentry: dentry for symlink
1271 * @nd: nameidata
1272 *
1273 */
1274
1275 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1276 {
1277 int len = 0;
1278 char *link = __getname();
1279
1280 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
1281
1282 if (!link)
1283 link = ERR_PTR(-ENOMEM);
1284 else {
1285 len = v9fs_readlink(dentry, link, PATH_MAX);
1286
1287 if (len < 0) {
1288 __putname(link);
1289 link = ERR_PTR(len);
1290 } else
1291 link[min(len, PATH_MAX-1)] = 0;
1292 }
1293 nd_set_link(nd, link);
1294
1295 return NULL;
1296 }
1297
1298 /**
1299 * v9fs_vfs_put_link - release a symlink path
1300 * @dentry: dentry for symlink
1301 * @nd: nameidata
1302 * @p: unused
1303 *
1304 */
1305
1306 void
1307 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1308 {
1309 char *s = nd_get_link(nd);
1310
1311 p9_debug(P9_DEBUG_VFS, " %s %s\n",
1312 dentry->d_name.name, IS_ERR(s) ? "<error>" : s);
1313 if (!IS_ERR(s))
1314 __putname(s);
1315 }
1316
1317 /**
1318 * v9fs_vfs_mkspecial - create a special file
1319 * @dir: inode to create special file in
1320 * @dentry: dentry to create
1321 * @mode: mode to create special file
1322 * @extension: 9p2000.u format extension string representing special file
1323 *
1324 */
1325
1326 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1327 u32 perm, const char *extension)
1328 {
1329 struct p9_fid *fid;
1330 struct v9fs_session_info *v9ses;
1331
1332 v9ses = v9fs_inode2v9ses(dir);
1333 if (!v9fs_proto_dotu(v9ses)) {
1334 p9_debug(P9_DEBUG_ERROR, "not extended\n");
1335 return -EPERM;
1336 }
1337
1338 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1339 P9_OREAD);
1340 if (IS_ERR(fid))
1341 return PTR_ERR(fid);
1342
1343 v9fs_invalidate_inode_attr(dir);
1344 p9_client_clunk(fid);
1345 return 0;
1346 }
1347
1348 /**
1349 * v9fs_vfs_symlink - helper function to create symlinks
1350 * @dir: directory inode containing symlink
1351 * @dentry: dentry for symlink
1352 * @symname: symlink data
1353 *
1354 * See Also: 9P2000.u RFC for more information
1355 *
1356 */
1357
1358 static int
1359 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1360 {
1361 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1362 dir->i_ino, dentry->d_name.name, symname);
1363
1364 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
1365 }
1366
1367 /**
1368 * v9fs_vfs_link - create a hardlink
1369 * @old_dentry: dentry for file to link to
1370 * @dir: inode destination for new link
1371 * @dentry: dentry for link
1372 *
1373 */
1374
1375 static int
1376 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1377 struct dentry *dentry)
1378 {
1379 int retval;
1380 char *name;
1381 struct p9_fid *oldfid;
1382
1383 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n",
1384 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name);
1385
1386 oldfid = v9fs_fid_clone(old_dentry);
1387 if (IS_ERR(oldfid))
1388 return PTR_ERR(oldfid);
1389
1390 name = __getname();
1391 if (unlikely(!name)) {
1392 retval = -ENOMEM;
1393 goto clunk_fid;
1394 }
1395
1396 sprintf(name, "%d\n", oldfid->fid);
1397 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1398 __putname(name);
1399 if (!retval) {
1400 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1401 v9fs_invalidate_inode_attr(dir);
1402 }
1403 clunk_fid:
1404 p9_client_clunk(oldfid);
1405 return retval;
1406 }
1407
1408 /**
1409 * v9fs_vfs_mknod - create a special file
1410 * @dir: inode destination for new link
1411 * @dentry: dentry for file
1412 * @mode: mode for creation
1413 * @rdev: device associated with special file
1414 *
1415 */
1416
1417 static int
1418 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1419 {
1420 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1421 int retval;
1422 char *name;
1423 u32 perm;
1424
1425 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
1426 dir->i_ino, dentry->d_name.name, mode,
1427 MAJOR(rdev), MINOR(rdev));
1428
1429 if (!new_valid_dev(rdev))
1430 return -EINVAL;
1431
1432 name = __getname();
1433 if (!name)
1434 return -ENOMEM;
1435 /* build extension */
1436 if (S_ISBLK(mode))
1437 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1438 else if (S_ISCHR(mode))
1439 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1440 else if (S_ISFIFO(mode))
1441 *name = 0;
1442 else if (S_ISSOCK(mode))
1443 *name = 0;
1444 else {
1445 __putname(name);
1446 return -EINVAL;
1447 }
1448
1449 perm = unixmode2p9mode(v9ses, mode);
1450 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
1451 __putname(name);
1452
1453 return retval;
1454 }
1455
1456 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1457 {
1458 int umode;
1459 dev_t rdev;
1460 loff_t i_size;
1461 struct p9_wstat *st;
1462 struct v9fs_session_info *v9ses;
1463
1464 v9ses = v9fs_inode2v9ses(inode);
1465 st = p9_client_stat(fid);
1466 if (IS_ERR(st))
1467 return PTR_ERR(st);
1468 /*
1469 * Don't update inode if the file type is different
1470 */
1471 umode = p9mode2unixmode(v9ses, st, &rdev);
1472 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1473 goto out;
1474
1475 spin_lock(&inode->i_lock);
1476 /*
1477 * We don't want to refresh inode->i_size,
1478 * because we may have cached data
1479 */
1480 i_size = inode->i_size;
1481 v9fs_stat2inode(st, inode, inode->i_sb);
1482 if (v9ses->cache)
1483 inode->i_size = i_size;
1484 spin_unlock(&inode->i_lock);
1485 out:
1486 p9stat_free(st);
1487 kfree(st);
1488 return 0;
1489 }
1490
1491 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1492 .create = v9fs_vfs_create,
1493 .lookup = v9fs_vfs_lookup,
1494 .atomic_open = v9fs_vfs_atomic_open,
1495 .symlink = v9fs_vfs_symlink,
1496 .link = v9fs_vfs_link,
1497 .unlink = v9fs_vfs_unlink,
1498 .mkdir = v9fs_vfs_mkdir,
1499 .rmdir = v9fs_vfs_rmdir,
1500 .mknod = v9fs_vfs_mknod,
1501 .rename = v9fs_vfs_rename,
1502 .getattr = v9fs_vfs_getattr,
1503 .setattr = v9fs_vfs_setattr,
1504 };
1505
1506 static const struct inode_operations v9fs_dir_inode_operations = {
1507 .create = v9fs_vfs_create,
1508 .lookup = v9fs_vfs_lookup,
1509 .atomic_open = v9fs_vfs_atomic_open,
1510 .unlink = v9fs_vfs_unlink,
1511 .mkdir = v9fs_vfs_mkdir,
1512 .rmdir = v9fs_vfs_rmdir,
1513 .mknod = v9fs_vfs_mknod,
1514 .rename = v9fs_vfs_rename,
1515 .getattr = v9fs_vfs_getattr,
1516 .setattr = v9fs_vfs_setattr,
1517 };
1518
1519 static const struct inode_operations v9fs_file_inode_operations = {
1520 .getattr = v9fs_vfs_getattr,
1521 .setattr = v9fs_vfs_setattr,
1522 };
1523
1524 static const struct inode_operations v9fs_symlink_inode_operations = {
1525 .readlink = generic_readlink,
1526 .follow_link = v9fs_vfs_follow_link,
1527 .put_link = v9fs_vfs_put_link,
1528 .getattr = v9fs_vfs_getattr,
1529 .setattr = v9fs_vfs_setattr,
1530 };
1531
Linus' kernel tree