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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / fs / 9p / vfs_inode.c
blobb5a1076aaa6c1d83b070181d901a2e0022979452
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 * @stat: p9_wstat from which mode need to be derived
99 * @rdev: major number, minor number in case of device files.
100 *
101 */
102 static int p9mode2unixmode(struct v9fs_session_info *v9ses,
103 struct p9_wstat *stat, dev_t *rdev)
104 {
105 int res;
106 int mode = stat->mode;
107
108 res = mode & S_IALLUGO;
109 *rdev = 0;
110
111 if ((mode & P9_DMDIR) == P9_DMDIR)
112 res |= S_IFDIR;
113 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
114 res |= S_IFLNK;
115 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
116 && (v9ses->nodev == 0))
117 res |= S_IFSOCK;
118 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
119 && (v9ses->nodev == 0))
120 res |= S_IFIFO;
121 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
122 && (v9ses->nodev == 0)) {
123 char type = 0, ext[32];
124 int major = -1, minor = -1;
125
126 strncpy(ext, stat->extension, sizeof(ext));
127 sscanf(ext, "%c %u %u", &type, &major, &minor);
128 switch (type) {
129 case 'c':
130 res |= S_IFCHR;
131 break;
132 case 'b':
133 res |= S_IFBLK;
134 break;
135 default:
136 P9_DPRINTK(P9_DEBUG_ERROR,
137 "Unknown special type %c %s\n", type,
138 stat->extension);
139 };
140 *rdev = MKDEV(major, minor);
141 } else
142 res |= S_IFREG;
143
144 if (v9fs_proto_dotu(v9ses)) {
145 if ((mode & P9_DMSETUID) == P9_DMSETUID)
146 res |= S_ISUID;
147
148 if ((mode & P9_DMSETGID) == P9_DMSETGID)
149 res |= S_ISGID;
150
151 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
152 res |= S_ISVTX;
153 }
154 return res;
155 }
156
157 /**
158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
159 * @uflags: flags to convert
160 * @extended: if .u extensions are active
161 */
162
163 int v9fs_uflags2omode(int uflags, int extended)
164 {
165 int ret;
166
167 ret = 0;
168 switch (uflags&3) {
169 default:
170 case O_RDONLY:
171 ret = P9_OREAD;
172 break;
173
174 case O_WRONLY:
175 ret = P9_OWRITE;
176 break;
177
178 case O_RDWR:
179 ret = P9_ORDWR;
180 break;
181 }
182
183 if (uflags & O_TRUNC)
184 ret |= P9_OTRUNC;
185
186 if (extended) {
187 if (uflags & O_EXCL)
188 ret |= P9_OEXCL;
189
190 if (uflags & O_APPEND)
191 ret |= P9_OAPPEND;
192 }
193
194 return ret;
195 }
196
197 /**
198 * v9fs_blank_wstat - helper function to setup a 9P stat structure
199 * @wstat: structure to initialize
200 *
201 */
202
203 void
204 v9fs_blank_wstat(struct p9_wstat *wstat)
205 {
206 wstat->type = ~0;
207 wstat->dev = ~0;
208 wstat->qid.type = ~0;
209 wstat->qid.version = ~0;
210 *((long long *)&wstat->qid.path) = ~0;
211 wstat->mode = ~0;
212 wstat->atime = ~0;
213 wstat->mtime = ~0;
214 wstat->length = ~0;
215 wstat->name = NULL;
216 wstat->uid = NULL;
217 wstat->gid = NULL;
218 wstat->muid = NULL;
219 wstat->n_uid = ~0;
220 wstat->n_gid = ~0;
221 wstat->n_muid = ~0;
222 wstat->extension = NULL;
223 }
224
225 /**
226 * v9fs_alloc_inode - helper function to allocate an inode
227 *
228 */
229 struct inode *v9fs_alloc_inode(struct super_block *sb)
230 {
231 struct v9fs_inode *v9inode;
232 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
233 GFP_KERNEL);
234 if (!v9inode)
235 return NULL;
236 #ifdef CONFIG_9P_FSCACHE
237 v9inode->fscache = NULL;
238 spin_lock_init(&v9inode->fscache_lock);
239 #endif
240 v9inode->writeback_fid = NULL;
241 v9inode->cache_validity = 0;
242 mutex_init(&v9inode->v_mutex);
243 return &v9inode->vfs_inode;
244 }
245
246 /**
247 * v9fs_destroy_inode - destroy an inode
248 *
249 */
250
251 static void v9fs_i_callback(struct rcu_head *head)
252 {
253 struct inode *inode = container_of(head, struct inode, i_rcu);
254 INIT_LIST_HEAD(&inode->i_dentry);
255 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
256 }
257
258 void v9fs_destroy_inode(struct inode *inode)
259 {
260 call_rcu(&inode->i_rcu, v9fs_i_callback);
261 }
262
263 int v9fs_init_inode(struct v9fs_session_info *v9ses,
264 struct inode *inode, int mode, dev_t rdev)
265 {
266 int err = 0;
267
268 inode_init_owner(inode, NULL, mode);
269 inode->i_blocks = 0;
270 inode->i_rdev = rdev;
271 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
272 inode->i_mapping->a_ops = &v9fs_addr_operations;
273
274 switch (mode & S_IFMT) {
275 case S_IFIFO:
276 case S_IFBLK:
277 case S_IFCHR:
278 case S_IFSOCK:
279 if (v9fs_proto_dotl(v9ses)) {
280 inode->i_op = &v9fs_file_inode_operations_dotl;
281 } else if (v9fs_proto_dotu(v9ses)) {
282 inode->i_op = &v9fs_file_inode_operations;
283 } else {
284 P9_DPRINTK(P9_DEBUG_ERROR,
285 "special files without extended mode\n");
286 err = -EINVAL;
287 goto error;
288 }
289 init_special_inode(inode, inode->i_mode, inode->i_rdev);
290 break;
291 case S_IFREG:
292 if (v9fs_proto_dotl(v9ses)) {
293 inode->i_op = &v9fs_file_inode_operations_dotl;
294 if (v9ses->cache)
295 inode->i_fop =
296 &v9fs_cached_file_operations_dotl;
297 else
298 inode->i_fop = &v9fs_file_operations_dotl;
299 } else {
300 inode->i_op = &v9fs_file_inode_operations;
301 if (v9ses->cache)
302 inode->i_fop = &v9fs_cached_file_operations;
303 else
304 inode->i_fop = &v9fs_file_operations;
305 }
306
307 break;
308 case S_IFLNK:
309 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
310 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
311 "legacy protocol.\n");
312 err = -EINVAL;
313 goto error;
314 }
315
316 if (v9fs_proto_dotl(v9ses))
317 inode->i_op = &v9fs_symlink_inode_operations_dotl;
318 else
319 inode->i_op = &v9fs_symlink_inode_operations;
320
321 break;
322 case S_IFDIR:
323 inc_nlink(inode);
324 if (v9fs_proto_dotl(v9ses))
325 inode->i_op = &v9fs_dir_inode_operations_dotl;
326 else if (v9fs_proto_dotu(v9ses))
327 inode->i_op = &v9fs_dir_inode_operations_dotu;
328 else
329 inode->i_op = &v9fs_dir_inode_operations;
330
331 if (v9fs_proto_dotl(v9ses))
332 inode->i_fop = &v9fs_dir_operations_dotl;
333 else
334 inode->i_fop = &v9fs_dir_operations;
335
336 break;
337 default:
338 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
339 mode, mode & S_IFMT);
340 err = -EINVAL;
341 goto error;
342 }
343 error:
344 return err;
345
346 }
347
348 /**
349 * v9fs_get_inode - helper function to setup an inode
350 * @sb: superblock
351 * @mode: mode to setup inode with
352 *
353 */
354
355 struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev)
356 {
357 int err;
358 struct inode *inode;
359 struct v9fs_session_info *v9ses = sb->s_fs_info;
360
361 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
362
363 inode = new_inode(sb);
364 if (!inode) {
365 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
366 return ERR_PTR(-ENOMEM);
367 }
368 err = v9fs_init_inode(v9ses, inode, mode, rdev);
369 if (err) {
370 iput(inode);
371 return ERR_PTR(err);
372 }
373 return inode;
374 }
375
376 /*
377 static struct v9fs_fid*
378 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
379 {
380 int err;
381 int nfid;
382 struct v9fs_fid *ret;
383 struct v9fs_fcall *fcall;
384
385 nfid = v9fs_get_idpool(&v9ses->fidpool);
386 if (nfid < 0) {
387 eprintk(KERN_WARNING, "no free fids available\n");
388 return ERR_PTR(-ENOSPC);
389 }
390
391 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
392 &fcall);
393
394 if (err < 0) {
395 if (fcall && fcall->id == RWALK)
396 goto clunk_fid;
397
398 PRINT_FCALL_ERROR("walk error", fcall);
399 v9fs_put_idpool(nfid, &v9ses->fidpool);
400 goto error;
401 }
402
403 kfree(fcall);
404 fcall = NULL;
405 ret = v9fs_fid_create(v9ses, nfid);
406 if (!ret) {
407 err = -ENOMEM;
408 goto clunk_fid;
409 }
410
411 err = v9fs_fid_insert(ret, dentry);
412 if (err < 0) {
413 v9fs_fid_destroy(ret);
414 goto clunk_fid;
415 }
416
417 return ret;
418
419 clunk_fid:
420 v9fs_t_clunk(v9ses, nfid);
421
422 error:
423 kfree(fcall);
424 return ERR_PTR(err);
425 }
426 */
427
428
429 /**
430 * v9fs_clear_inode - release an inode
431 * @inode: inode to release
432 *
433 */
434 void v9fs_evict_inode(struct inode *inode)
435 {
436 struct v9fs_inode *v9inode = V9FS_I(inode);
437
438 truncate_inode_pages(inode->i_mapping, 0);
439 end_writeback(inode);
440 filemap_fdatawrite(inode->i_mapping);
441
442 #ifdef CONFIG_9P_FSCACHE
443 v9fs_cache_inode_put_cookie(inode);
444 #endif
445 /* clunk the fid stashed in writeback_fid */
446 if (v9inode->writeback_fid) {
447 p9_client_clunk(v9inode->writeback_fid);
448 v9inode->writeback_fid = NULL;
449 }
450 }
451
452 static int v9fs_test_inode(struct inode *inode, void *data)
453 {
454 int umode;
455 dev_t rdev;
456 struct v9fs_inode *v9inode = V9FS_I(inode);
457 struct p9_wstat *st = (struct p9_wstat *)data;
458 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
459
460 umode = p9mode2unixmode(v9ses, st, &rdev);
461 /* don't match inode of different type */
462 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
463 return 0;
464
465 /* compare qid details */
466 if (memcmp(&v9inode->qid.version,
467 &st->qid.version, sizeof(v9inode->qid.version)))
468 return 0;
469
470 if (v9inode->qid.type != st->qid.type)
471 return 0;
472 return 1;
473 }
474
475 static int v9fs_test_new_inode(struct inode *inode, void *data)
476 {
477 return 0;
478 }
479
480 static int v9fs_set_inode(struct inode *inode, void *data)
481 {
482 struct v9fs_inode *v9inode = V9FS_I(inode);
483 struct p9_wstat *st = (struct p9_wstat *)data;
484
485 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
486 return 0;
487 }
488
489 static struct inode *v9fs_qid_iget(struct super_block *sb,
490 struct p9_qid *qid,
491 struct p9_wstat *st,
492 int new)
493 {
494 dev_t rdev;
495 int retval, umode;
496 unsigned long i_ino;
497 struct inode *inode;
498 struct v9fs_session_info *v9ses = sb->s_fs_info;
499 int (*test)(struct inode *, void *);
500
501 if (new)
502 test = v9fs_test_new_inode;
503 else
504 test = v9fs_test_inode;
505
506 i_ino = v9fs_qid2ino(qid);
507 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
508 if (!inode)
509 return ERR_PTR(-ENOMEM);
510 if (!(inode->i_state & I_NEW))
511 return inode;
512 /*
513 * initialize the inode with the stat info
514 * FIXME!! we may need support for stale inodes
515 * later.
516 */
517 inode->i_ino = i_ino;
518 umode = p9mode2unixmode(v9ses, st, &rdev);
519 retval = v9fs_init_inode(v9ses, inode, umode, rdev);
520 if (retval)
521 goto error;
522
523 v9fs_stat2inode(st, inode, sb);
524 #ifdef CONFIG_9P_FSCACHE
525 v9fs_cache_inode_get_cookie(inode);
526 #endif
527 unlock_new_inode(inode);
528 return inode;
529 error:
530 unlock_new_inode(inode);
531 iput(inode);
532 return ERR_PTR(retval);
533
534 }
535
536 struct inode *
537 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
538 struct super_block *sb, int new)
539 {
540 struct p9_wstat *st;
541 struct inode *inode = NULL;
542
543 st = p9_client_stat(fid);
544 if (IS_ERR(st))
545 return ERR_CAST(st);
546
547 inode = v9fs_qid_iget(sb, &st->qid, st, new);
548 p9stat_free(st);
549 kfree(st);
550 return inode;
551 }
552
553 /**
554 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
555 * plan 9 AT flag.
556 * @flags: flags to convert
557 */
558 static int v9fs_at_to_dotl_flags(int flags)
559 {
560 int rflags = 0;
561 if (flags & AT_REMOVEDIR)
562 rflags |= P9_DOTL_AT_REMOVEDIR;
563 return rflags;
564 }
565
566 /**
567 * v9fs_remove - helper function to remove files and directories
568 * @dir: directory inode that is being deleted
569 * @dentry: dentry that is being deleted
570 * @rmdir: removing a directory
571 *
572 */
573
574 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
575 {
576 struct inode *inode;
577 int retval = -EOPNOTSUPP;
578 struct p9_fid *v9fid, *dfid;
579 struct v9fs_session_info *v9ses;
580
581 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
582 dir, dentry, flags);
583
584 v9ses = v9fs_inode2v9ses(dir);
585 inode = dentry->d_inode;
586 dfid = v9fs_fid_lookup(dentry->d_parent);
587 if (IS_ERR(dfid)) {
588 retval = PTR_ERR(dfid);
589 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
590 return retval;
591 }
592 if (v9fs_proto_dotl(v9ses))
593 retval = p9_client_unlinkat(dfid, dentry->d_name.name,
594 v9fs_at_to_dotl_flags(flags));
595 if (retval == -EOPNOTSUPP) {
596 /* Try the one based on path */
597 v9fid = v9fs_fid_clone(dentry);
598 if (IS_ERR(v9fid))
599 return PTR_ERR(v9fid);
600 retval = p9_client_remove(v9fid);
601 }
602 if (!retval) {
603 /*
604 * directories on unlink should have zero
605 * link count
606 */
607 if (flags & AT_REMOVEDIR) {
608 clear_nlink(inode);
609 drop_nlink(dir);
610 } else
611 drop_nlink(inode);
612
613 v9fs_invalidate_inode_attr(inode);
614 v9fs_invalidate_inode_attr(dir);
615 }
616 return retval;
617 }
618
619 /**
620 * v9fs_create - Create a file
621 * @v9ses: session information
622 * @dir: directory that dentry is being created in
623 * @dentry: dentry that is being created
624 * @extension: 9p2000.u extension string to support devices, etc.
625 * @perm: create permissions
626 * @mode: open mode
627 *
628 */
629 static struct p9_fid *
630 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
631 struct dentry *dentry, char *extension, u32 perm, u8 mode)
632 {
633 int err;
634 char *name;
635 struct p9_fid *dfid, *ofid, *fid;
636 struct inode *inode;
637
638 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
639
640 err = 0;
641 ofid = NULL;
642 fid = NULL;
643 name = (char *) dentry->d_name.name;
644 dfid = v9fs_fid_lookup(dentry->d_parent);
645 if (IS_ERR(dfid)) {
646 err = PTR_ERR(dfid);
647 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
648 return ERR_PTR(err);
649 }
650
651 /* clone a fid to use for creation */
652 ofid = p9_client_walk(dfid, 0, NULL, 1);
653 if (IS_ERR(ofid)) {
654 err = PTR_ERR(ofid);
655 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
656 return ERR_PTR(err);
657 }
658
659 err = p9_client_fcreate(ofid, name, perm, mode, extension);
660 if (err < 0) {
661 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
662 goto error;
663 }
664
665 /* now walk from the parent so we can get unopened fid */
666 fid = p9_client_walk(dfid, 1, &name, 1);
667 if (IS_ERR(fid)) {
668 err = PTR_ERR(fid);
669 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
670 fid = NULL;
671 goto error;
672 }
673
674 /* instantiate inode and assign the unopened fid to the dentry */
675 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
676 if (IS_ERR(inode)) {
677 err = PTR_ERR(inode);
678 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
679 goto error;
680 }
681 err = v9fs_fid_add(dentry, fid);
682 if (err < 0)
683 goto error;
684 d_instantiate(dentry, inode);
685 return ofid;
686 error:
687 if (ofid)
688 p9_client_clunk(ofid);
689
690 if (fid)
691 p9_client_clunk(fid);
692
693 return ERR_PTR(err);
694 }
695
696 /**
697 * v9fs_vfs_create - VFS hook to create files
698 * @dir: directory inode that is being created
699 * @dentry: dentry that is being deleted
700 * @mode: create permissions
701 * @nd: path information
702 *
703 */
704
705 static int
706 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
707 struct nameidata *nd)
708 {
709 int err;
710 u32 perm;
711 int flags;
712 struct file *filp;
713 struct v9fs_inode *v9inode;
714 struct v9fs_session_info *v9ses;
715 struct p9_fid *fid, *inode_fid;
716
717 err = 0;
718 fid = NULL;
719 v9ses = v9fs_inode2v9ses(dir);
720 perm = unixmode2p9mode(v9ses, mode);
721 if (nd)
722 flags = nd->intent.open.flags;
723 else
724 flags = O_RDWR;
725
726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
727 v9fs_uflags2omode(flags,
728 v9fs_proto_dotu(v9ses)));
729 if (IS_ERR(fid)) {
730 err = PTR_ERR(fid);
731 fid = NULL;
732 goto error;
733 }
734
735 v9fs_invalidate_inode_attr(dir);
736 /* if we are opening a file, assign the open fid to the file */
737 if (nd) {
738 v9inode = V9FS_I(dentry->d_inode);
739 mutex_lock(&v9inode->v_mutex);
740 if (v9ses->cache && !v9inode->writeback_fid &&
741 ((flags & O_ACCMODE) != O_RDONLY)) {
742 /*
743 * clone a fid and add it to writeback_fid
744 * we do it during open time instead of
745 * page dirty time via write_begin/page_mkwrite
746 * because we want write after unlink usecase
747 * to work.
748 */
749 inode_fid = v9fs_writeback_fid(dentry);
750 if (IS_ERR(inode_fid)) {
751 err = PTR_ERR(inode_fid);
752 mutex_unlock(&v9inode->v_mutex);
753 goto error;
754 }
755 v9inode->writeback_fid = (void *) inode_fid;
756 }
757 mutex_unlock(&v9inode->v_mutex);
758 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
759 if (IS_ERR(filp)) {
760 err = PTR_ERR(filp);
761 goto error;
762 }
763
764 filp->private_data = fid;
765 #ifdef CONFIG_9P_FSCACHE
766 if (v9ses->cache)
767 v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
768 #endif
769 } else
770 p9_client_clunk(fid);
771
772 return 0;
773
774 error:
775 if (fid)
776 p9_client_clunk(fid);
777
778 return err;
779 }
780
781 /**
782 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
783 * @dir: inode that is being unlinked
784 * @dentry: dentry that is being unlinked
785 * @mode: mode for new directory
786 *
787 */
788
789 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
790 {
791 int err;
792 u32 perm;
793 struct p9_fid *fid;
794 struct v9fs_session_info *v9ses;
795
796 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
797 err = 0;
798 v9ses = v9fs_inode2v9ses(dir);
799 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
800 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
801 if (IS_ERR(fid)) {
802 err = PTR_ERR(fid);
803 fid = NULL;
804 } else {
805 inc_nlink(dir);
806 v9fs_invalidate_inode_attr(dir);
807 }
808
809 if (fid)
810 p9_client_clunk(fid);
811
812 return err;
813 }
814
815 /**
816 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
817 * @dir: inode that is being walked from
818 * @dentry: dentry that is being walked to?
819 * @nameidata: path data
820 *
821 */
822
823 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
824 struct nameidata *nameidata)
825 {
826 struct dentry *res;
827 struct super_block *sb;
828 struct v9fs_session_info *v9ses;
829 struct p9_fid *dfid, *fid;
830 struct inode *inode;
831 char *name;
832 int result = 0;
833
834 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
835 dir, dentry->d_name.name, dentry, nameidata);
836
837 if (dentry->d_name.len > NAME_MAX)
838 return ERR_PTR(-ENAMETOOLONG);
839
840 sb = dir->i_sb;
841 v9ses = v9fs_inode2v9ses(dir);
842 /* We can walk d_parent because we hold the dir->i_mutex */
843 dfid = v9fs_fid_lookup(dentry->d_parent);
844 if (IS_ERR(dfid))
845 return ERR_CAST(dfid);
846
847 name = (char *) dentry->d_name.name;
848 fid = p9_client_walk(dfid, 1, &name, 1);
849 if (IS_ERR(fid)) {
850 result = PTR_ERR(fid);
851 if (result == -ENOENT) {
852 inode = NULL;
853 goto inst_out;
854 }
855
856 return ERR_PTR(result);
857 }
858 /*
859 * Make sure we don't use a wrong inode due to parallel
860 * unlink. For cached mode create calls request for new
861 * inode. But with cache disabled, lookup should do this.
862 */
863 if (v9ses->cache)
864 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
865 else
866 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
867 if (IS_ERR(inode)) {
868 result = PTR_ERR(inode);
869 inode = NULL;
870 goto error;
871 }
872 result = v9fs_fid_add(dentry, fid);
873 if (result < 0)
874 goto error_iput;
875 inst_out:
876 /*
877 * If we had a rename on the server and a parallel lookup
878 * for the new name, then make sure we instantiate with
879 * the new name. ie look up for a/b, while on server somebody
880 * moved b under k and client parallely did a lookup for
881 * k/b.
882 */
883 res = d_materialise_unique(dentry, inode);
884 if (!IS_ERR(res))
885 return res;
886 result = PTR_ERR(res);
887 error_iput:
888 iput(inode);
889 error:
890 p9_client_clunk(fid);
891
892 return ERR_PTR(result);
893 }
894
895 /**
896 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
897 * @i: inode that is being unlinked
898 * @d: dentry that is being unlinked
899 *
900 */
901
902 int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
903 {
904 return v9fs_remove(i, d, 0);
905 }
906
907 /**
908 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
909 * @i: inode that is being unlinked
910 * @d: dentry that is being unlinked
911 *
912 */
913
914 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
915 {
916 return v9fs_remove(i, d, AT_REMOVEDIR);
917 }
918
919 /**
920 * v9fs_vfs_rename - VFS hook to rename an inode
921 * @old_dir: old dir inode
922 * @old_dentry: old dentry
923 * @new_dir: new dir inode
924 * @new_dentry: new dentry
925 *
926 */
927
928 int
929 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
930 struct inode *new_dir, struct dentry *new_dentry)
931 {
932 int retval;
933 struct inode *old_inode;
934 struct inode *new_inode;
935 struct v9fs_session_info *v9ses;
936 struct p9_fid *oldfid;
937 struct p9_fid *olddirfid;
938 struct p9_fid *newdirfid;
939 struct p9_wstat wstat;
940
941 P9_DPRINTK(P9_DEBUG_VFS, "\n");
942 retval = 0;
943 old_inode = old_dentry->d_inode;
944 new_inode = new_dentry->d_inode;
945 v9ses = v9fs_inode2v9ses(old_inode);
946 oldfid = v9fs_fid_lookup(old_dentry);
947 if (IS_ERR(oldfid))
948 return PTR_ERR(oldfid);
949
950 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
951 if (IS_ERR(olddirfid)) {
952 retval = PTR_ERR(olddirfid);
953 goto done;
954 }
955
956 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
957 if (IS_ERR(newdirfid)) {
958 retval = PTR_ERR(newdirfid);
959 goto clunk_olddir;
960 }
961
962 down_write(&v9ses->rename_sem);
963 if (v9fs_proto_dotl(v9ses)) {
964 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
965 newdirfid, new_dentry->d_name.name);
966 if (retval == -EOPNOTSUPP)
967 retval = p9_client_rename(oldfid, newdirfid,
968 new_dentry->d_name.name);
969 if (retval != -EOPNOTSUPP)
970 goto clunk_newdir;
971 }
972 if (old_dentry->d_parent != new_dentry->d_parent) {
973 /*
974 * 9P .u can only handle file rename in the same directory
975 */
976
977 P9_DPRINTK(P9_DEBUG_ERROR,
978 "old dir and new dir are different\n");
979 retval = -EXDEV;
980 goto clunk_newdir;
981 }
982 v9fs_blank_wstat(&wstat);
983 wstat.muid = v9ses->uname;
984 wstat.name = (char *) new_dentry->d_name.name;
985 retval = p9_client_wstat(oldfid, &wstat);
986
987 clunk_newdir:
988 if (!retval) {
989 if (new_inode) {
990 if (S_ISDIR(new_inode->i_mode))
991 clear_nlink(new_inode);
992 else
993 drop_nlink(new_inode);
994 }
995 if (S_ISDIR(old_inode->i_mode)) {
996 if (!new_inode)
997 inc_nlink(new_dir);
998 drop_nlink(old_dir);
999 }
1000 v9fs_invalidate_inode_attr(old_inode);
1001 v9fs_invalidate_inode_attr(old_dir);
1002 v9fs_invalidate_inode_attr(new_dir);
1003
1004 /* successful rename */
1005 d_move(old_dentry, new_dentry);
1006 }
1007 up_write(&v9ses->rename_sem);
1008 p9_client_clunk(newdirfid);
1009
1010 clunk_olddir:
1011 p9_client_clunk(olddirfid);
1012
1013 done:
1014 return retval;
1015 }
1016
1017 /**
1018 * v9fs_vfs_getattr - retrieve file metadata
1019 * @mnt: mount information
1020 * @dentry: file to get attributes on
1021 * @stat: metadata structure to populate
1022 *
1023 */
1024
1025 static int
1026 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1027 struct kstat *stat)
1028 {
1029 int err;
1030 struct v9fs_session_info *v9ses;
1031 struct p9_fid *fid;
1032 struct p9_wstat *st;
1033
1034 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1035 err = -EPERM;
1036 v9ses = v9fs_dentry2v9ses(dentry);
1037 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1038 generic_fillattr(dentry->d_inode, stat);
1039 return 0;
1040 }
1041 fid = v9fs_fid_lookup(dentry);
1042 if (IS_ERR(fid))
1043 return PTR_ERR(fid);
1044
1045 st = p9_client_stat(fid);
1046 if (IS_ERR(st))
1047 return PTR_ERR(st);
1048
1049 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1050 generic_fillattr(dentry->d_inode, stat);
1051
1052 p9stat_free(st);
1053 kfree(st);
1054 return 0;
1055 }
1056
1057 /**
1058 * v9fs_vfs_setattr - set file metadata
1059 * @dentry: file whose metadata to set
1060 * @iattr: metadata assignment structure
1061 *
1062 */
1063
1064 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1065 {
1066 int retval;
1067 struct v9fs_session_info *v9ses;
1068 struct p9_fid *fid;
1069 struct p9_wstat wstat;
1070
1071 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1072 retval = inode_change_ok(dentry->d_inode, iattr);
1073 if (retval)
1074 return retval;
1075
1076 retval = -EPERM;
1077 v9ses = v9fs_dentry2v9ses(dentry);
1078 fid = v9fs_fid_lookup(dentry);
1079 if(IS_ERR(fid))
1080 return PTR_ERR(fid);
1081
1082 v9fs_blank_wstat(&wstat);
1083 if (iattr->ia_valid & ATTR_MODE)
1084 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1085
1086 if (iattr->ia_valid & ATTR_MTIME)
1087 wstat.mtime = iattr->ia_mtime.tv_sec;
1088
1089 if (iattr->ia_valid & ATTR_ATIME)
1090 wstat.atime = iattr->ia_atime.tv_sec;
1091
1092 if (iattr->ia_valid & ATTR_SIZE)
1093 wstat.length = iattr->ia_size;
1094
1095 if (v9fs_proto_dotu(v9ses)) {
1096 if (iattr->ia_valid & ATTR_UID)
1097 wstat.n_uid = iattr->ia_uid;
1098
1099 if (iattr->ia_valid & ATTR_GID)
1100 wstat.n_gid = iattr->ia_gid;
1101 }
1102
1103 /* Write all dirty data */
1104 if (S_ISREG(dentry->d_inode->i_mode))
1105 filemap_write_and_wait(dentry->d_inode->i_mapping);
1106
1107 retval = p9_client_wstat(fid, &wstat);
1108 if (retval < 0)
1109 return retval;
1110
1111 if ((iattr->ia_valid & ATTR_SIZE) &&
1112 iattr->ia_size != i_size_read(dentry->d_inode))
1113 truncate_setsize(dentry->d_inode, iattr->ia_size);
1114
1115 v9fs_invalidate_inode_attr(dentry->d_inode);
1116
1117 setattr_copy(dentry->d_inode, iattr);
1118 mark_inode_dirty(dentry->d_inode);
1119 return 0;
1120 }
1121
1122 /**
1123 * v9fs_stat2inode - populate an inode structure with mistat info
1124 * @stat: Plan 9 metadata (mistat) structure
1125 * @inode: inode to populate
1126 * @sb: superblock of filesystem
1127 *
1128 */
1129
1130 void
1131 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1132 struct super_block *sb)
1133 {
1134 mode_t mode;
1135 char ext[32];
1136 char tag_name[14];
1137 unsigned int i_nlink;
1138 struct v9fs_session_info *v9ses = sb->s_fs_info;
1139 struct v9fs_inode *v9inode = V9FS_I(inode);
1140
1141 inode->i_nlink = 1;
1142
1143 inode->i_atime.tv_sec = stat->atime;
1144 inode->i_mtime.tv_sec = stat->mtime;
1145 inode->i_ctime.tv_sec = stat->mtime;
1146
1147 inode->i_uid = v9ses->dfltuid;
1148 inode->i_gid = v9ses->dfltgid;
1149
1150 if (v9fs_proto_dotu(v9ses)) {
1151 inode->i_uid = stat->n_uid;
1152 inode->i_gid = stat->n_gid;
1153 }
1154 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1155 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1156 /*
1157 * Hadlink support got added later to
1158 * to the .u extension. So there can be
1159 * server out there that doesn't support
1160 * this even with .u extension. So check
1161 * for non NULL stat->extension
1162 */
1163 strncpy(ext, stat->extension, sizeof(ext));
1164 /* HARDLINKCOUNT %u */
1165 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1166 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1167 inode->i_nlink = i_nlink;
1168 }
1169 }
1170 mode = stat->mode & S_IALLUGO;
1171 mode |= inode->i_mode & ~S_IALLUGO;
1172 inode->i_mode = mode;
1173 i_size_write(inode, stat->length);
1174
1175 /* not real number of blocks, but 512 byte ones ... */
1176 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1177 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1178 }
1179
1180 /**
1181 * v9fs_qid2ino - convert qid into inode number
1182 * @qid: qid to hash
1183 *
1184 * BUG: potential for inode number collisions?
1185 */
1186
1187 ino_t v9fs_qid2ino(struct p9_qid *qid)
1188 {
1189 u64 path = qid->path + 2;
1190 ino_t i = 0;
1191
1192 if (sizeof(ino_t) == sizeof(path))
1193 memcpy(&i, &path, sizeof(ino_t));
1194 else
1195 i = (ino_t) (path ^ (path >> 32));
1196
1197 return i;
1198 }
1199
1200 /**
1201 * v9fs_readlink - read a symlink's location (internal version)
1202 * @dentry: dentry for symlink
1203 * @buffer: buffer to load symlink location into
1204 * @buflen: length of buffer
1205 *
1206 */
1207
1208 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1209 {
1210 int retval;
1211
1212 struct v9fs_session_info *v9ses;
1213 struct p9_fid *fid;
1214 struct p9_wstat *st;
1215
1216 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1217 retval = -EPERM;
1218 v9ses = v9fs_dentry2v9ses(dentry);
1219 fid = v9fs_fid_lookup(dentry);
1220 if (IS_ERR(fid))
1221 return PTR_ERR(fid);
1222
1223 if (!v9fs_proto_dotu(v9ses))
1224 return -EBADF;
1225
1226 st = p9_client_stat(fid);
1227 if (IS_ERR(st))
1228 return PTR_ERR(st);
1229
1230 if (!(st->mode & P9_DMSYMLINK)) {
1231 retval = -EINVAL;
1232 goto done;
1233 }
1234
1235 /* copy extension buffer into buffer */
1236 strncpy(buffer, st->extension, buflen);
1237
1238 P9_DPRINTK(P9_DEBUG_VFS,
1239 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1240
1241 retval = strnlen(buffer, buflen);
1242 done:
1243 p9stat_free(st);
1244 kfree(st);
1245 return retval;
1246 }
1247
1248 /**
1249 * v9fs_vfs_follow_link - follow a symlink path
1250 * @dentry: dentry for symlink
1251 * @nd: nameidata
1252 *
1253 */
1254
1255 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1256 {
1257 int len = 0;
1258 char *link = __getname();
1259
1260 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1261
1262 if (!link)
1263 link = ERR_PTR(-ENOMEM);
1264 else {
1265 len = v9fs_readlink(dentry, link, PATH_MAX);
1266
1267 if (len < 0) {
1268 __putname(link);
1269 link = ERR_PTR(len);
1270 } else
1271 link[min(len, PATH_MAX-1)] = 0;
1272 }
1273 nd_set_link(nd, link);
1274
1275 return NULL;
1276 }
1277
1278 /**
1279 * v9fs_vfs_put_link - release a symlink path
1280 * @dentry: dentry for symlink
1281 * @nd: nameidata
1282 * @p: unused
1283 *
1284 */
1285
1286 void
1287 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1288 {
1289 char *s = nd_get_link(nd);
1290
1291 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1292 IS_ERR(s) ? "<error>" : s);
1293 if (!IS_ERR(s))
1294 __putname(s);
1295 }
1296
1297 /**
1298 * v9fs_vfs_mkspecial - create a special file
1299 * @dir: inode to create special file in
1300 * @dentry: dentry to create
1301 * @mode: mode to create special file
1302 * @extension: 9p2000.u format extension string representing special file
1303 *
1304 */
1305
1306 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1307 int mode, const char *extension)
1308 {
1309 u32 perm;
1310 struct p9_fid *fid;
1311 struct v9fs_session_info *v9ses;
1312
1313 v9ses = v9fs_inode2v9ses(dir);
1314 if (!v9fs_proto_dotu(v9ses)) {
1315 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1316 return -EPERM;
1317 }
1318
1319 perm = unixmode2p9mode(v9ses, mode);
1320 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1321 P9_OREAD);
1322 if (IS_ERR(fid))
1323 return PTR_ERR(fid);
1324
1325 v9fs_invalidate_inode_attr(dir);
1326 p9_client_clunk(fid);
1327 return 0;
1328 }
1329
1330 /**
1331 * v9fs_vfs_symlink - helper function to create symlinks
1332 * @dir: directory inode containing symlink
1333 * @dentry: dentry for symlink
1334 * @symname: symlink data
1335 *
1336 * See Also: 9P2000.u RFC for more information
1337 *
1338 */
1339
1340 static int
1341 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1342 {
1343 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1344 dentry->d_name.name, symname);
1345
1346 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1347 }
1348
1349 /**
1350 * v9fs_vfs_link - create a hardlink
1351 * @old_dentry: dentry for file to link to
1352 * @dir: inode destination for new link
1353 * @dentry: dentry for link
1354 *
1355 */
1356
1357 static int
1358 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1359 struct dentry *dentry)
1360 {
1361 int retval;
1362 char *name;
1363 struct p9_fid *oldfid;
1364
1365 P9_DPRINTK(P9_DEBUG_VFS,
1366 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1367 old_dentry->d_name.name);
1368
1369 oldfid = v9fs_fid_clone(old_dentry);
1370 if (IS_ERR(oldfid))
1371 return PTR_ERR(oldfid);
1372
1373 name = __getname();
1374 if (unlikely(!name)) {
1375 retval = -ENOMEM;
1376 goto clunk_fid;
1377 }
1378
1379 sprintf(name, "%d\n", oldfid->fid);
1380 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1381 __putname(name);
1382 if (!retval) {
1383 v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1384 v9fs_invalidate_inode_attr(dir);
1385 }
1386 clunk_fid:
1387 p9_client_clunk(oldfid);
1388 return retval;
1389 }
1390
1391 /**
1392 * v9fs_vfs_mknod - create a special file
1393 * @dir: inode destination for new link
1394 * @dentry: dentry for file
1395 * @mode: mode for creation
1396 * @rdev: device associated with special file
1397 *
1398 */
1399
1400 static int
1401 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1402 {
1403 int retval;
1404 char *name;
1405
1406 P9_DPRINTK(P9_DEBUG_VFS,
1407 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1408 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1409
1410 if (!new_valid_dev(rdev))
1411 return -EINVAL;
1412
1413 name = __getname();
1414 if (!name)
1415 return -ENOMEM;
1416 /* build extension */
1417 if (S_ISBLK(mode))
1418 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1419 else if (S_ISCHR(mode))
1420 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1421 else if (S_ISFIFO(mode))
1422 *name = 0;
1423 else if (S_ISSOCK(mode))
1424 *name = 0;
1425 else {
1426 __putname(name);
1427 return -EINVAL;
1428 }
1429
1430 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1431 __putname(name);
1432
1433 return retval;
1434 }
1435
1436 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
1437 {
1438 int umode;
1439 dev_t rdev;
1440 loff_t i_size;
1441 struct p9_wstat *st;
1442 struct v9fs_session_info *v9ses;
1443
1444 v9ses = v9fs_inode2v9ses(inode);
1445 st = p9_client_stat(fid);
1446 if (IS_ERR(st))
1447 return PTR_ERR(st);
1448 /*
1449 * Don't update inode if the file type is different
1450 */
1451 umode = p9mode2unixmode(v9ses, st, &rdev);
1452 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
1453 goto out;
1454
1455 spin_lock(&inode->i_lock);
1456 /*
1457 * We don't want to refresh inode->i_size,
1458 * because we may have cached data
1459 */
1460 i_size = inode->i_size;
1461 v9fs_stat2inode(st, inode, inode->i_sb);
1462 if (v9ses->cache)
1463 inode->i_size = i_size;
1464 spin_unlock(&inode->i_lock);
1465 out:
1466 p9stat_free(st);
1467 kfree(st);
1468 return 0;
1469 }
1470
1471 static const struct inode_operations v9fs_dir_inode_operations_dotu = {
1472 .create = v9fs_vfs_create,
1473 .lookup = v9fs_vfs_lookup,
1474 .symlink = v9fs_vfs_symlink,
1475 .link = v9fs_vfs_link,
1476 .unlink = v9fs_vfs_unlink,
1477 .mkdir = v9fs_vfs_mkdir,
1478 .rmdir = v9fs_vfs_rmdir,
1479 .mknod = v9fs_vfs_mknod,
1480 .rename = v9fs_vfs_rename,
1481 .getattr = v9fs_vfs_getattr,
1482 .setattr = v9fs_vfs_setattr,
1483 };
1484
1485 static const struct inode_operations v9fs_dir_inode_operations = {
1486 .create = v9fs_vfs_create,
1487 .lookup = v9fs_vfs_lookup,
1488 .unlink = v9fs_vfs_unlink,
1489 .mkdir = v9fs_vfs_mkdir,
1490 .rmdir = v9fs_vfs_rmdir,
1491 .mknod = v9fs_vfs_mknod,
1492 .rename = v9fs_vfs_rename,
1493 .getattr = v9fs_vfs_getattr,
1494 .setattr = v9fs_vfs_setattr,
1495 };
1496
1497 static const struct inode_operations v9fs_file_inode_operations = {
1498 .getattr = v9fs_vfs_getattr,
1499 .setattr = v9fs_vfs_setattr,
1500 };
1501
1502 static const struct inode_operations v9fs_symlink_inode_operations = {
1503 .readlink = generic_readlink,
1504 .follow_link = v9fs_vfs_follow_link,
1505 .put_link = v9fs_vfs_put_link,
1506 .getattr = v9fs_vfs_getattr,
1507 .setattr = v9fs_vfs_setattr,
1508 };
1509
Linux Btrfs Development