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ARM: 8051/1: put_user: fix possible data corruption in put_user
[linux/fpc-iii.git] / fs / reiserfs / super.c
blobee095246da4e195c40cf8d1b6e6eb85043b7c9ef
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <linux/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/backing-dev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/exportfs.h>
27 #include <linux/quotaops.h>
28 #include <linux/vfs.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/crc32.h>
32 #include <linux/seq_file.h>
33
34 struct file_system_type reiserfs_fs_type;
35
36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 {
42 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
43 strlen(reiserfs_3_5_magic_string));
44 }
45
46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 {
48 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
49 strlen(reiserfs_3_6_magic_string));
50 }
51
52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 {
54 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
55 strlen(reiserfs_jr_magic_string));
56 }
57
58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 {
60 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
61 is_reiserfs_jr(rs));
62 }
63
64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66
67 static int reiserfs_sync_fs(struct super_block *s, int wait)
68 {
69 struct reiserfs_transaction_handle th;
70
71 /*
72 * Writeback quota in non-journalled quota case - journalled quota has
73 * no dirty dquots
74 */
75 dquot_writeback_dquots(s, -1);
76 reiserfs_write_lock(s);
77 if (!journal_begin(&th, s, 1))
78 if (!journal_end_sync(&th))
79 reiserfs_flush_old_commits(s);
80 reiserfs_write_unlock(s);
81 return 0;
82 }
83
84 static void flush_old_commits(struct work_struct *work)
85 {
86 struct reiserfs_sb_info *sbi;
87 struct super_block *s;
88
89 sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
90 s = sbi->s_journal->j_work_sb;
91
92 spin_lock(&sbi->old_work_lock);
93 /* Avoid clobbering the cancel state... */
94 if (sbi->work_queued == 1)
95 sbi->work_queued = 0;
96 spin_unlock(&sbi->old_work_lock);
97
98 reiserfs_sync_fs(s, 1);
99 }
100
101 void reiserfs_schedule_old_flush(struct super_block *s)
102 {
103 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
104 unsigned long delay;
105
106 /*
107 * Avoid scheduling flush when sb is being shut down. It can race
108 * with journal shutdown and free still queued delayed work.
109 */
110 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
111 return;
112
113 spin_lock(&sbi->old_work_lock);
114 if (!sbi->work_queued) {
115 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
116 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
117 sbi->work_queued = 1;
118 }
119 spin_unlock(&sbi->old_work_lock);
120 }
121
122 void reiserfs_cancel_old_flush(struct super_block *s)
123 {
124 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
125
126 spin_lock(&sbi->old_work_lock);
127 /* Make sure no new flushes will be queued */
128 sbi->work_queued = 2;
129 spin_unlock(&sbi->old_work_lock);
130 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
131 }
132
133 static int reiserfs_freeze(struct super_block *s)
134 {
135 struct reiserfs_transaction_handle th;
136
137 reiserfs_cancel_old_flush(s);
138
139 reiserfs_write_lock(s);
140 if (!(s->s_flags & MS_RDONLY)) {
141 int err = journal_begin(&th, s, 1);
142 if (err) {
143 reiserfs_block_writes(&th);
144 } else {
145 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
146 1);
147 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
148 reiserfs_block_writes(&th);
149 journal_end_sync(&th);
150 }
151 }
152 reiserfs_write_unlock(s);
153 return 0;
154 }
155
156 static int reiserfs_unfreeze(struct super_block *s)
157 {
158 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
159
160 reiserfs_allow_writes(s);
161 spin_lock(&sbi->old_work_lock);
162 /* Allow old_work to run again */
163 sbi->work_queued = 0;
164 spin_unlock(&sbi->old_work_lock);
165 return 0;
166 }
167
168 extern const struct in_core_key MAX_IN_CORE_KEY;
169
170 /*
171 * this is used to delete "save link" when there are no items of a
172 * file it points to. It can either happen if unlink is completed but
173 * "save unlink" removal, or if file has both unlink and truncate
174 * pending and as unlink completes first (because key of "save link"
175 * protecting unlink is bigger that a key lf "save link" which
176 * protects truncate), so there left no items to make truncate
177 * completion on
178 */
179 static int remove_save_link_only(struct super_block *s,
180 struct reiserfs_key *key, int oid_free)
181 {
182 struct reiserfs_transaction_handle th;
183 int err;
184
185 /* we are going to do one balancing */
186 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
187 if (err)
188 return err;
189
190 reiserfs_delete_solid_item(&th, NULL, key);
191 if (oid_free)
192 /* removals are protected by direct items */
193 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
194
195 return journal_end(&th);
196 }
197
198 #ifdef CONFIG_QUOTA
199 static int reiserfs_quota_on_mount(struct super_block *, int);
200 #endif
201
202 /*
203 * Look for uncompleted unlinks and truncates and complete them
204 *
205 * Called with superblock write locked. If quotas are enabled, we have to
206 * release/retake lest we call dquot_quota_on_mount(), proceed to
207 * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
208 * cpu worklets to complete flush_async_commits() that in turn wait for the
209 * superblock write lock.
210 */
211 static int finish_unfinished(struct super_block *s)
212 {
213 INITIALIZE_PATH(path);
214 struct cpu_key max_cpu_key, obj_key;
215 struct reiserfs_key save_link_key, last_inode_key;
216 int retval = 0;
217 struct item_head *ih;
218 struct buffer_head *bh;
219 int item_pos;
220 char *item;
221 int done;
222 struct inode *inode;
223 int truncate;
224 #ifdef CONFIG_QUOTA
225 int i;
226 int ms_active_set;
227 int quota_enabled[REISERFS_MAXQUOTAS];
228 #endif
229
230 /* compose key to look for "save" links */
231 max_cpu_key.version = KEY_FORMAT_3_5;
232 max_cpu_key.on_disk_key.k_dir_id = ~0U;
233 max_cpu_key.on_disk_key.k_objectid = ~0U;
234 set_cpu_key_k_offset(&max_cpu_key, ~0U);
235 max_cpu_key.key_length = 3;
236
237 memset(&last_inode_key, 0, sizeof(last_inode_key));
238
239 #ifdef CONFIG_QUOTA
240 /* Needed for iput() to work correctly and not trash data */
241 if (s->s_flags & MS_ACTIVE) {
242 ms_active_set = 0;
243 } else {
244 ms_active_set = 1;
245 s->s_flags |= MS_ACTIVE;
246 }
247 /* Turn on quotas so that they are updated correctly */
248 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
249 quota_enabled[i] = 1;
250 if (REISERFS_SB(s)->s_qf_names[i]) {
251 int ret;
252
253 if (sb_has_quota_active(s, i)) {
254 quota_enabled[i] = 0;
255 continue;
256 }
257 reiserfs_write_unlock(s);
258 ret = reiserfs_quota_on_mount(s, i);
259 reiserfs_write_lock(s);
260 if (ret < 0)
261 reiserfs_warning(s, "reiserfs-2500",
262 "cannot turn on journaled "
263 "quota: error %d", ret);
264 }
265 }
266 #endif
267
268 done = 0;
269 REISERFS_SB(s)->s_is_unlinked_ok = 1;
270 while (!retval) {
271 int depth;
272 retval = search_item(s, &max_cpu_key, &path);
273 if (retval != ITEM_NOT_FOUND) {
274 reiserfs_error(s, "vs-2140",
275 "search_by_key returned %d", retval);
276 break;
277 }
278
279 bh = get_last_bh(&path);
280 item_pos = get_item_pos(&path);
281 if (item_pos != B_NR_ITEMS(bh)) {
282 reiserfs_warning(s, "vs-2060",
283 "wrong position found");
284 break;
285 }
286 item_pos--;
287 ih = item_head(bh, item_pos);
288
289 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
290 /* there are no "save" links anymore */
291 break;
292
293 save_link_key = ih->ih_key;
294 if (is_indirect_le_ih(ih))
295 truncate = 1;
296 else
297 truncate = 0;
298
299 /* reiserfs_iget needs k_dirid and k_objectid only */
300 item = ih_item_body(bh, ih);
301 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
302 obj_key.on_disk_key.k_objectid =
303 le32_to_cpu(ih->ih_key.k_objectid);
304 obj_key.on_disk_key.k_offset = 0;
305 obj_key.on_disk_key.k_type = 0;
306
307 pathrelse(&path);
308
309 inode = reiserfs_iget(s, &obj_key);
310 if (!inode) {
311 /*
312 * the unlink almost completed, it just did not
313 * manage to remove "save" link and release objectid
314 */
315 reiserfs_warning(s, "vs-2180", "iget failed for %K",
316 &obj_key);
317 retval = remove_save_link_only(s, &save_link_key, 1);
318 continue;
319 }
320
321 if (!truncate && inode->i_nlink) {
322 /* file is not unlinked */
323 reiserfs_warning(s, "vs-2185",
324 "file %K is not unlinked",
325 &obj_key);
326 retval = remove_save_link_only(s, &save_link_key, 0);
327 continue;
328 }
329 depth = reiserfs_write_unlock_nested(inode->i_sb);
330 dquot_initialize(inode);
331 reiserfs_write_lock_nested(inode->i_sb, depth);
332
333 if (truncate && S_ISDIR(inode->i_mode)) {
334 /*
335 * We got a truncate request for a dir which
336 * is impossible. The only imaginable way is to
337 * execute unfinished truncate request then boot
338 * into old kernel, remove the file and create dir
339 * with the same key.
340 */
341 reiserfs_warning(s, "green-2101",
342 "impossible truncate on a "
343 "directory %k. Please report",
344 INODE_PKEY(inode));
345 retval = remove_save_link_only(s, &save_link_key, 0);
346 truncate = 0;
347 iput(inode);
348 continue;
349 }
350
351 if (truncate) {
352 REISERFS_I(inode)->i_flags |=
353 i_link_saved_truncate_mask;
354 /*
355 * not completed truncate found. New size was
356 * committed together with "save" link
357 */
358 reiserfs_info(s, "Truncating %k to %lld ..",
359 INODE_PKEY(inode), inode->i_size);
360
361 /* don't update modification time */
362 reiserfs_truncate_file(inode, 0);
363
364 retval = remove_save_link(inode, truncate);
365 } else {
366 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
367 /* not completed unlink (rmdir) found */
368 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
369 if (memcmp(&last_inode_key, INODE_PKEY(inode),
370 sizeof(last_inode_key))){
371 last_inode_key = *INODE_PKEY(inode);
372 /* removal gets completed in iput */
373 retval = 0;
374 } else {
375 reiserfs_warning(s, "super-2189", "Dead loop "
376 "in finish_unfinished "
377 "detected, just remove "
378 "save link\n");
379 retval = remove_save_link_only(s,
380 &save_link_key, 0);
381 }
382 }
383
384 iput(inode);
385 printk("done\n");
386 done++;
387 }
388 REISERFS_SB(s)->s_is_unlinked_ok = 0;
389
390 #ifdef CONFIG_QUOTA
391 /* Turn quotas off */
392 reiserfs_write_unlock(s);
393 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
394 if (sb_dqopt(s)->files[i] && quota_enabled[i])
395 dquot_quota_off(s, i);
396 }
397 reiserfs_write_lock(s);
398 if (ms_active_set)
399 /* Restore the flag back */
400 s->s_flags &= ~MS_ACTIVE;
401 #endif
402 pathrelse(&path);
403 if (done)
404 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
405 "Completed\n", done);
406 return retval;
407 }
408
409 /*
410 * to protect file being unlinked from getting lost we "safe" link files
411 * being unlinked. This link will be deleted in the same transaction with last
412 * item of file. mounting the filesystem we scan all these links and remove
413 * files which almost got lost
414 */
415 void add_save_link(struct reiserfs_transaction_handle *th,
416 struct inode *inode, int truncate)
417 {
418 INITIALIZE_PATH(path);
419 int retval;
420 struct cpu_key key;
421 struct item_head ih;
422 __le32 link;
423
424 BUG_ON(!th->t_trans_id);
425
426 /* file can only get one "save link" of each kind */
427 RFALSE(truncate &&
428 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
429 "saved link already exists for truncated inode %lx",
430 (long)inode->i_ino);
431 RFALSE(!truncate &&
432 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
433 "saved link already exists for unlinked inode %lx",
434 (long)inode->i_ino);
435
436 /* setup key of "save" link */
437 key.version = KEY_FORMAT_3_5;
438 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
439 key.on_disk_key.k_objectid = inode->i_ino;
440 if (!truncate) {
441 /* unlink, rmdir, rename */
442 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
443 set_cpu_key_k_type(&key, TYPE_DIRECT);
444
445 /* item head of "safe" link */
446 make_le_item_head(&ih, &key, key.version,
447 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
448 4 /*length */ , 0xffff /*free space */ );
449 } else {
450 /* truncate */
451 if (S_ISDIR(inode->i_mode))
452 reiserfs_warning(inode->i_sb, "green-2102",
453 "Adding a truncate savelink for "
454 "a directory %k! Please report",
455 INODE_PKEY(inode));
456 set_cpu_key_k_offset(&key, 1);
457 set_cpu_key_k_type(&key, TYPE_INDIRECT);
458
459 /* item head of "safe" link */
460 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
461 4 /*length */ , 0 /*free space */ );
462 }
463 key.key_length = 3;
464
465 /* look for its place in the tree */
466 retval = search_item(inode->i_sb, &key, &path);
467 if (retval != ITEM_NOT_FOUND) {
468 if (retval != -ENOSPC)
469 reiserfs_error(inode->i_sb, "vs-2100",
470 "search_by_key (%K) returned %d", &key,
471 retval);
472 pathrelse(&path);
473 return;
474 }
475
476 /* body of "save" link */
477 link = INODE_PKEY(inode)->k_dir_id;
478
479 /* put "save" link into tree, don't charge quota to anyone */
480 retval =
481 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
482 if (retval) {
483 if (retval != -ENOSPC)
484 reiserfs_error(inode->i_sb, "vs-2120",
485 "insert_item returned %d", retval);
486 } else {
487 if (truncate)
488 REISERFS_I(inode)->i_flags |=
489 i_link_saved_truncate_mask;
490 else
491 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
492 }
493 }
494
495 /* this opens transaction unlike add_save_link */
496 int remove_save_link(struct inode *inode, int truncate)
497 {
498 struct reiserfs_transaction_handle th;
499 struct reiserfs_key key;
500 int err;
501
502 /* we are going to do one balancing only */
503 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
504 if (err)
505 return err;
506
507 /* setup key of "save" link */
508 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
509 key.k_objectid = INODE_PKEY(inode)->k_objectid;
510 if (!truncate) {
511 /* unlink, rmdir, rename */
512 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
513 1 + inode->i_sb->s_blocksize);
514 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
515 } else {
516 /* truncate */
517 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
518 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
519 }
520
521 if ((truncate &&
522 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
523 (!truncate &&
524 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
525 /* don't take quota bytes from anywhere */
526 reiserfs_delete_solid_item(&th, NULL, &key);
527 if (!truncate) {
528 reiserfs_release_objectid(&th, inode->i_ino);
529 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
530 } else
531 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
532
533 return journal_end(&th);
534 }
535
536 static void reiserfs_kill_sb(struct super_block *s)
537 {
538 if (REISERFS_SB(s)) {
539 reiserfs_proc_info_done(s);
540 /*
541 * Force any pending inode evictions to occur now. Any
542 * inodes to be removed that have extended attributes
543 * associated with them need to clean them up before
544 * we can release the extended attribute root dentries.
545 * shrink_dcache_for_umount will BUG if we don't release
546 * those before it's called so ->put_super is too late.
547 */
548 shrink_dcache_sb(s);
549
550 dput(REISERFS_SB(s)->xattr_root);
551 REISERFS_SB(s)->xattr_root = NULL;
552 dput(REISERFS_SB(s)->priv_root);
553 REISERFS_SB(s)->priv_root = NULL;
554 }
555
556 kill_block_super(s);
557 }
558
559 static void reiserfs_put_super(struct super_block *s)
560 {
561 struct reiserfs_transaction_handle th;
562 th.t_trans_id = 0;
563
564 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
565
566 reiserfs_write_lock(s);
567
568 /*
569 * change file system state to current state if it was mounted
570 * with read-write permissions
571 */
572 if (!(s->s_flags & MS_RDONLY)) {
573 if (!journal_begin(&th, s, 10)) {
574 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
575 1);
576 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
577 REISERFS_SB(s)->s_mount_state);
578 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
579 }
580 }
581
582 /*
583 * note, journal_release checks for readonly mount, and can
584 * decide not to do a journal_end
585 */
586 journal_release(&th, s);
587
588 reiserfs_free_bitmap_cache(s);
589
590 brelse(SB_BUFFER_WITH_SB(s));
591
592 print_statistics(s);
593
594 if (REISERFS_SB(s)->reserved_blocks != 0) {
595 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
596 REISERFS_SB(s)->reserved_blocks);
597 }
598
599 reiserfs_write_unlock(s);
600 mutex_destroy(&REISERFS_SB(s)->lock);
601 destroy_workqueue(REISERFS_SB(s)->commit_wq);
602 kfree(s->s_fs_info);
603 s->s_fs_info = NULL;
604 }
605
606 static struct kmem_cache *reiserfs_inode_cachep;
607
608 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
609 {
610 struct reiserfs_inode_info *ei;
611 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
612 if (!ei)
613 return NULL;
614 atomic_set(&ei->openers, 0);
615 mutex_init(&ei->tailpack);
616 #ifdef CONFIG_QUOTA
617 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
618 #endif
619
620 return &ei->vfs_inode;
621 }
622
623 static void reiserfs_i_callback(struct rcu_head *head)
624 {
625 struct inode *inode = container_of(head, struct inode, i_rcu);
626 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
627 }
628
629 static void reiserfs_destroy_inode(struct inode *inode)
630 {
631 call_rcu(&inode->i_rcu, reiserfs_i_callback);
632 }
633
634 static void init_once(void *foo)
635 {
636 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
637
638 INIT_LIST_HEAD(&ei->i_prealloc_list);
639 inode_init_once(&ei->vfs_inode);
640 }
641
642 static int __init init_inodecache(void)
643 {
644 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
645 sizeof(struct
646 reiserfs_inode_info),
647 0, (SLAB_RECLAIM_ACCOUNT|
648 SLAB_MEM_SPREAD),
649 init_once);
650 if (reiserfs_inode_cachep == NULL)
651 return -ENOMEM;
652 return 0;
653 }
654
655 static void destroy_inodecache(void)
656 {
657 /*
658 * Make sure all delayed rcu free inodes are flushed before we
659 * destroy cache.
660 */
661 rcu_barrier();
662 kmem_cache_destroy(reiserfs_inode_cachep);
663 }
664
665 /* we don't mark inodes dirty, we just log them */
666 static void reiserfs_dirty_inode(struct inode *inode, int flags)
667 {
668 struct reiserfs_transaction_handle th;
669
670 int err = 0;
671
672 if (inode->i_sb->s_flags & MS_RDONLY) {
673 reiserfs_warning(inode->i_sb, "clm-6006",
674 "writing inode %lu on readonly FS",
675 inode->i_ino);
676 return;
677 }
678 reiserfs_write_lock(inode->i_sb);
679
680 /*
681 * this is really only used for atime updates, so they don't have
682 * to be included in O_SYNC or fsync
683 */
684 err = journal_begin(&th, inode->i_sb, 1);
685 if (err)
686 goto out;
687
688 reiserfs_update_sd(&th, inode);
689 journal_end(&th);
690
691 out:
692 reiserfs_write_unlock(inode->i_sb);
693 }
694
695 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
696 {
697 struct super_block *s = root->d_sb;
698 struct reiserfs_journal *journal = SB_JOURNAL(s);
699 long opts = REISERFS_SB(s)->s_mount_opt;
700
701 if (opts & (1 << REISERFS_LARGETAIL))
702 seq_puts(seq, ",tails=on");
703 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
704 seq_puts(seq, ",notail");
705 /* tails=small is default so we don't show it */
706
707 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
708 seq_puts(seq, ",barrier=none");
709 /* barrier=flush is default so we don't show it */
710
711 if (opts & (1 << REISERFS_ERROR_CONTINUE))
712 seq_puts(seq, ",errors=continue");
713 else if (opts & (1 << REISERFS_ERROR_PANIC))
714 seq_puts(seq, ",errors=panic");
715 /* errors=ro is default so we don't show it */
716
717 if (opts & (1 << REISERFS_DATA_LOG))
718 seq_puts(seq, ",data=journal");
719 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
720 seq_puts(seq, ",data=writeback");
721 /* data=ordered is default so we don't show it */
722
723 if (opts & (1 << REISERFS_ATTRS))
724 seq_puts(seq, ",attrs");
725
726 if (opts & (1 << REISERFS_XATTRS_USER))
727 seq_puts(seq, ",user_xattr");
728
729 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
730 seq_puts(seq, ",expose_privroot");
731
732 if (opts & (1 << REISERFS_POSIXACL))
733 seq_puts(seq, ",acl");
734
735 if (REISERFS_SB(s)->s_jdev)
736 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
737
738 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
739 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
740
741 #ifdef CONFIG_QUOTA
742 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
743 seq_show_option(seq, "usrjquota",
744 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
745 else if (opts & (1 << REISERFS_USRQUOTA))
746 seq_puts(seq, ",usrquota");
747 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
748 seq_show_option(seq, "grpjquota",
749 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
750 else if (opts & (1 << REISERFS_GRPQUOTA))
751 seq_puts(seq, ",grpquota");
752 if (REISERFS_SB(s)->s_jquota_fmt) {
753 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
754 seq_puts(seq, ",jqfmt=vfsold");
755 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
756 seq_puts(seq, ",jqfmt=vfsv0");
757 }
758 #endif
759
760 /* Block allocator options */
761 if (opts & (1 << REISERFS_NO_BORDER))
762 seq_puts(seq, ",block-allocator=noborder");
763 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
764 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
765 if (opts & (1 << REISERFS_HASHED_RELOCATION))
766 seq_puts(seq, ",block-allocator=hashed_relocation");
767 if (opts & (1 << REISERFS_TEST4))
768 seq_puts(seq, ",block-allocator=test4");
769 show_alloc_options(seq, s);
770 return 0;
771 }
772
773 #ifdef CONFIG_QUOTA
774 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
775 size_t, loff_t);
776 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
777 loff_t);
778
779 static struct dquot **reiserfs_get_dquots(struct inode *inode)
780 {
781 return REISERFS_I(inode)->i_dquot;
782 }
783 #endif
784
785 static const struct super_operations reiserfs_sops = {
786 .alloc_inode = reiserfs_alloc_inode,
787 .destroy_inode = reiserfs_destroy_inode,
788 .write_inode = reiserfs_write_inode,
789 .dirty_inode = reiserfs_dirty_inode,
790 .evict_inode = reiserfs_evict_inode,
791 .put_super = reiserfs_put_super,
792 .sync_fs = reiserfs_sync_fs,
793 .freeze_fs = reiserfs_freeze,
794 .unfreeze_fs = reiserfs_unfreeze,
795 .statfs = reiserfs_statfs,
796 .remount_fs = reiserfs_remount,
797 .show_options = reiserfs_show_options,
798 #ifdef CONFIG_QUOTA
799 .quota_read = reiserfs_quota_read,
800 .quota_write = reiserfs_quota_write,
801 .get_dquots = reiserfs_get_dquots,
802 #endif
803 };
804
805 #ifdef CONFIG_QUOTA
806 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
807
808 static int reiserfs_write_dquot(struct dquot *);
809 static int reiserfs_acquire_dquot(struct dquot *);
810 static int reiserfs_release_dquot(struct dquot *);
811 static int reiserfs_mark_dquot_dirty(struct dquot *);
812 static int reiserfs_write_info(struct super_block *, int);
813 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
814
815 static const struct dquot_operations reiserfs_quota_operations = {
816 .write_dquot = reiserfs_write_dquot,
817 .acquire_dquot = reiserfs_acquire_dquot,
818 .release_dquot = reiserfs_release_dquot,
819 .mark_dirty = reiserfs_mark_dquot_dirty,
820 .write_info = reiserfs_write_info,
821 .alloc_dquot = dquot_alloc,
822 .destroy_dquot = dquot_destroy,
823 };
824
825 static const struct quotactl_ops reiserfs_qctl_operations = {
826 .quota_on = reiserfs_quota_on,
827 .quota_off = dquot_quota_off,
828 .quota_sync = dquot_quota_sync,
829 .get_state = dquot_get_state,
830 .set_info = dquot_set_dqinfo,
831 .get_dqblk = dquot_get_dqblk,
832 .set_dqblk = dquot_set_dqblk,
833 };
834 #endif
835
836 static const struct export_operations reiserfs_export_ops = {
837 .encode_fh = reiserfs_encode_fh,
838 .fh_to_dentry = reiserfs_fh_to_dentry,
839 .fh_to_parent = reiserfs_fh_to_parent,
840 .get_parent = reiserfs_get_parent,
841 };
842
843 /*
844 * this struct is used in reiserfs_getopt () for containing the value for
845 * those mount options that have values rather than being toggles.
846 */
847 typedef struct {
848 char *value;
849 /*
850 * bitmask which is to set on mount_options bitmask
851 * when this value is found, 0 is no bits are to be changed.
852 */
853 int setmask;
854 /*
855 * bitmask which is to clear on mount_options bitmask
856 * when this value is found, 0 is no bits are to be changed.
857 * This is applied BEFORE setmask
858 */
859 int clrmask;
860 } arg_desc_t;
861
862 /* Set this bit in arg_required to allow empty arguments */
863 #define REISERFS_OPT_ALLOWEMPTY 31
864
865 /*
866 * this struct is used in reiserfs_getopt() for describing the
867 * set of reiserfs mount options
868 */
869 typedef struct {
870 char *option_name;
871
872 /* 0 if argument is not required, not 0 otherwise */
873 int arg_required;
874
875 /* list of values accepted by an option */
876 const arg_desc_t *values;
877
878 /*
879 * bitmask which is to set on mount_options bitmask
880 * when this value is found, 0 is no bits are to be changed.
881 */
882 int setmask;
883
884 /*
885 * bitmask which is to clear on mount_options bitmask
886 * when this value is found, 0 is no bits are to be changed.
887 * This is applied BEFORE setmask
888 */
889 int clrmask;
890 } opt_desc_t;
891
892 /* possible values for -o data= */
893 static const arg_desc_t logging_mode[] = {
894 {"ordered", 1 << REISERFS_DATA_ORDERED,
895 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
896 {"journal", 1 << REISERFS_DATA_LOG,
897 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
898 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
899 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
900 {.value = NULL}
901 };
902
903 /* possible values for -o barrier= */
904 static const arg_desc_t barrier_mode[] = {
905 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
906 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
907 {.value = NULL}
908 };
909
910 /*
911 * possible values for "-o block-allocator=" and bits which are to be set in
912 * s_mount_opt of reiserfs specific part of in-core super block
913 */
914 static const arg_desc_t balloc[] = {
915 {"noborder", 1 << REISERFS_NO_BORDER, 0},
916 {"border", 0, 1 << REISERFS_NO_BORDER},
917 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
918 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
919 {"test4", 1 << REISERFS_TEST4, 0},
920 {"notest4", 0, 1 << REISERFS_TEST4},
921 {NULL, 0, 0}
922 };
923
924 static const arg_desc_t tails[] = {
925 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
926 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
927 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
928 {NULL, 0, 0}
929 };
930
931 static const arg_desc_t error_actions[] = {
932 {"panic", 1 << REISERFS_ERROR_PANIC,
933 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
934 {"ro-remount", 1 << REISERFS_ERROR_RO,
935 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
936 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
937 {"continue", 1 << REISERFS_ERROR_CONTINUE,
938 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
939 #endif
940 {NULL, 0, 0},
941 };
942
943 /*
944 * proceed only one option from a list *cur - string containing of mount
945 * options
946 * opts - array of options which are accepted
947 * opt_arg - if option is found and requires an argument and if it is specifed
948 * in the input - pointer to the argument is stored here
949 * bit_flags - if option requires to set a certain bit - it is set here
950 * return -1 if unknown option is found, opt->arg_required otherwise
951 */
952 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
953 char **opt_arg, unsigned long *bit_flags)
954 {
955 char *p;
956 /*
957 * foo=bar,
958 * ^ ^ ^
959 * | | +-- option_end
960 * | +-- arg_start
961 * +-- option_start
962 */
963 const opt_desc_t *opt;
964 const arg_desc_t *arg;
965
966 p = *cur;
967
968 /* assume argument cannot contain commas */
969 *cur = strchr(p, ',');
970 if (*cur) {
971 *(*cur) = '\0';
972 (*cur)++;
973 }
974
975 if (!strncmp(p, "alloc=", 6)) {
976 /*
977 * Ugly special case, probably we should redo options
978 * parser so that it can understand several arguments for
979 * some options, also so that it can fill several bitfields
980 * with option values.
981 */
982 if (reiserfs_parse_alloc_options(s, p + 6)) {
983 return -1;
984 } else {
985 return 0;
986 }
987 }
988
989 /* for every option in the list */
990 for (opt = opts; opt->option_name; opt++) {
991 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
992 if (bit_flags) {
993 if (opt->clrmask ==
994 (1 << REISERFS_UNSUPPORTED_OPT))
995 reiserfs_warning(s, "super-6500",
996 "%s not supported.\n",
997 p);
998 else
999 *bit_flags &= ~opt->clrmask;
1000 if (opt->setmask ==
1001 (1 << REISERFS_UNSUPPORTED_OPT))
1002 reiserfs_warning(s, "super-6501",
1003 "%s not supported.\n",
1004 p);
1005 else
1006 *bit_flags |= opt->setmask;
1007 }
1008 break;
1009 }
1010 }
1011 if (!opt->option_name) {
1012 reiserfs_warning(s, "super-6502",
1013 "unknown mount option \"%s\"", p);
1014 return -1;
1015 }
1016
1017 p += strlen(opt->option_name);
1018 switch (*p) {
1019 case '=':
1020 if (!opt->arg_required) {
1021 reiserfs_warning(s, "super-6503",
1022 "the option \"%s\" does not "
1023 "require an argument\n",
1024 opt->option_name);
1025 return -1;
1026 }
1027 break;
1028
1029 case 0:
1030 if (opt->arg_required) {
1031 reiserfs_warning(s, "super-6504",
1032 "the option \"%s\" requires an "
1033 "argument\n", opt->option_name);
1034 return -1;
1035 }
1036 break;
1037 default:
1038 reiserfs_warning(s, "super-6505",
1039 "head of option \"%s\" is only correct\n",
1040 opt->option_name);
1041 return -1;
1042 }
1043
1044 /*
1045 * move to the argument, or to next option if argument is not
1046 * required
1047 */
1048 p++;
1049
1050 if (opt->arg_required
1051 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1052 && !strlen(p)) {
1053 /* this catches "option=," if not allowed */
1054 reiserfs_warning(s, "super-6506",
1055 "empty argument for \"%s\"\n",
1056 opt->option_name);
1057 return -1;
1058 }
1059
1060 if (!opt->values) {
1061 /* *=NULLopt_arg contains pointer to argument */
1062 *opt_arg = p;
1063 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1064 }
1065
1066 /* values possible for this option are listed in opt->values */
1067 for (arg = opt->values; arg->value; arg++) {
1068 if (!strcmp(p, arg->value)) {
1069 if (bit_flags) {
1070 *bit_flags &= ~arg->clrmask;
1071 *bit_flags |= arg->setmask;
1072 }
1073 return opt->arg_required;
1074 }
1075 }
1076
1077 reiserfs_warning(s, "super-6506",
1078 "bad value \"%s\" for option \"%s\"\n", p,
1079 opt->option_name);
1080 return -1;
1081 }
1082
1083 /* returns 0 if something is wrong in option string, 1 - otherwise */
1084 static int reiserfs_parse_options(struct super_block *s,
1085
1086 /* string given via mount's -o */
1087 char *options,
1088
1089 /*
1090 * after the parsing phase, contains the
1091 * collection of bitflags defining what
1092 * mount options were selected.
1093 */
1094 unsigned long *mount_options,
1095
1096 /* strtol-ed from NNN of resize=NNN */
1097 unsigned long *blocks,
1098 char **jdev_name,
1099 unsigned int *commit_max_age,
1100 char **qf_names,
1101 unsigned int *qfmt)
1102 {
1103 int c;
1104 char *arg = NULL;
1105 char *pos;
1106 opt_desc_t opts[] = {
1107 /*
1108 * Compatibility stuff, so that -o notail for old
1109 * setups still work
1110 */
1111 {"tails",.arg_required = 't',.values = tails},
1112 {"notail",.clrmask =
1113 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1114 {"conv",.setmask = 1 << REISERFS_CONVERT},
1115 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1116 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1117 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1118 #ifdef CONFIG_REISERFS_FS_XATTR
1119 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1120 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1121 #else
1122 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1123 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1124 #endif
1125 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1126 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1127 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1128 #else
1129 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1130 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1131 #endif
1132 {.option_name = "nolog"},
1133 {"replayonly",.setmask = 1 << REPLAYONLY},
1134 {"block-allocator",.arg_required = 'a',.values = balloc},
1135 {"data",.arg_required = 'd',.values = logging_mode},
1136 {"barrier",.arg_required = 'b',.values = barrier_mode},
1137 {"resize",.arg_required = 'r',.values = NULL},
1138 {"jdev",.arg_required = 'j',.values = NULL},
1139 {"nolargeio",.arg_required = 'w',.values = NULL},
1140 {"commit",.arg_required = 'c',.values = NULL},
1141 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1142 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1143 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1144 {"errors",.arg_required = 'e',.values = error_actions},
1145 {"usrjquota",.arg_required =
1146 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1147 {"grpjquota",.arg_required =
1148 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1149 {"jqfmt",.arg_required = 'f',.values = NULL},
1150 {.option_name = NULL}
1151 };
1152
1153 *blocks = 0;
1154 if (!options || !*options)
1155 /*
1156 * use default configuration: create tails, journaling on, no
1157 * conversion to newest format
1158 */
1159 return 1;
1160
1161 for (pos = options; pos;) {
1162 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1163 if (c == -1)
1164 /* wrong option is given */
1165 return 0;
1166
1167 if (c == 'r') {
1168 char *p;
1169
1170 p = NULL;
1171 /* "resize=NNN" or "resize=auto" */
1172
1173 if (!strcmp(arg, "auto")) {
1174 /* From JFS code, to auto-get the size. */
1175 *blocks =
1176 s->s_bdev->bd_inode->i_size >> s->
1177 s_blocksize_bits;
1178 } else {
1179 *blocks = simple_strtoul(arg, &p, 0);
1180 if (*p != '\0') {
1181 /* NNN does not look like a number */
1182 reiserfs_warning(s, "super-6507",
1183 "bad value %s for "
1184 "-oresize\n", arg);
1185 return 0;
1186 }
1187 }
1188 }
1189
1190 if (c == 'c') {
1191 char *p = NULL;
1192 unsigned long val = simple_strtoul(arg, &p, 0);
1193 /* commit=NNN (time in seconds) */
1194 if (*p != '\0' || val >= (unsigned int)-1) {
1195 reiserfs_warning(s, "super-6508",
1196 "bad value %s for -ocommit\n",
1197 arg);
1198 return 0;
1199 }
1200 *commit_max_age = (unsigned int)val;
1201 }
1202
1203 if (c == 'w') {
1204 reiserfs_warning(s, "super-6509", "nolargeio option "
1205 "is no longer supported");
1206 return 0;
1207 }
1208
1209 if (c == 'j') {
1210 if (arg && *arg && jdev_name) {
1211 /* Hm, already assigned? */
1212 if (*jdev_name) {
1213 reiserfs_warning(s, "super-6510",
1214 "journal device was "
1215 "already specified to "
1216 "be %s", *jdev_name);
1217 return 0;
1218 }
1219 *jdev_name = arg;
1220 }
1221 }
1222 #ifdef CONFIG_QUOTA
1223 if (c == 'u' || c == 'g') {
1224 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1225
1226 if (sb_any_quota_loaded(s) &&
1227 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1228 reiserfs_warning(s, "super-6511",
1229 "cannot change journaled "
1230 "quota options when quota "
1231 "turned on.");
1232 return 0;
1233 }
1234 if (*arg) { /* Some filename specified? */
1235 if (REISERFS_SB(s)->s_qf_names[qtype]
1236 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1237 arg)) {
1238 reiserfs_warning(s, "super-6512",
1239 "%s quota file "
1240 "already specified.",
1241 QTYPE2NAME(qtype));
1242 return 0;
1243 }
1244 if (strchr(arg, '/')) {
1245 reiserfs_warning(s, "super-6513",
1246 "quotafile must be "
1247 "on filesystem root.");
1248 return 0;
1249 }
1250 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1251 if (!qf_names[qtype]) {
1252 reiserfs_warning(s, "reiserfs-2502",
1253 "not enough memory "
1254 "for storing "
1255 "quotafile name.");
1256 return 0;
1257 }
1258 if (qtype == USRQUOTA)
1259 *mount_options |= 1 << REISERFS_USRQUOTA;
1260 else
1261 *mount_options |= 1 << REISERFS_GRPQUOTA;
1262 } else {
1263 if (qf_names[qtype] !=
1264 REISERFS_SB(s)->s_qf_names[qtype])
1265 kfree(qf_names[qtype]);
1266 qf_names[qtype] = NULL;
1267 if (qtype == USRQUOTA)
1268 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1269 else
1270 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1271 }
1272 }
1273 if (c == 'f') {
1274 if (!strcmp(arg, "vfsold"))
1275 *qfmt = QFMT_VFS_OLD;
1276 else if (!strcmp(arg, "vfsv0"))
1277 *qfmt = QFMT_VFS_V0;
1278 else {
1279 reiserfs_warning(s, "super-6514",
1280 "unknown quota format "
1281 "specified.");
1282 return 0;
1283 }
1284 if (sb_any_quota_loaded(s) &&
1285 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1286 reiserfs_warning(s, "super-6515",
1287 "cannot change journaled "
1288 "quota options when quota "
1289 "turned on.");
1290 return 0;
1291 }
1292 }
1293 #else
1294 if (c == 'u' || c == 'g' || c == 'f') {
1295 reiserfs_warning(s, "reiserfs-2503", "journaled "
1296 "quota options not supported.");
1297 return 0;
1298 }
1299 #endif
1300 }
1301
1302 #ifdef CONFIG_QUOTA
1303 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1304 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1305 reiserfs_warning(s, "super-6515",
1306 "journaled quota format not specified.");
1307 return 0;
1308 }
1309 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1310 sb_has_quota_loaded(s, USRQUOTA)) ||
1311 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1312 sb_has_quota_loaded(s, GRPQUOTA))) {
1313 reiserfs_warning(s, "super-6516", "quota options must "
1314 "be present when quota is turned on.");
1315 return 0;
1316 }
1317 #endif
1318
1319 return 1;
1320 }
1321
1322 static void switch_data_mode(struct super_block *s, unsigned long mode)
1323 {
1324 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1325 (1 << REISERFS_DATA_ORDERED) |
1326 (1 << REISERFS_DATA_WRITEBACK));
1327 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1328 }
1329
1330 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1331 {
1332 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1333 if (!reiserfs_data_log(s)) {
1334 switch_data_mode(s, REISERFS_DATA_LOG);
1335 reiserfs_info(s, "switching to journaled data mode\n");
1336 }
1337 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1338 if (!reiserfs_data_ordered(s)) {
1339 switch_data_mode(s, REISERFS_DATA_ORDERED);
1340 reiserfs_info(s, "switching to ordered data mode\n");
1341 }
1342 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1343 if (!reiserfs_data_writeback(s)) {
1344 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1345 reiserfs_info(s, "switching to writeback data mode\n");
1346 }
1347 }
1348 }
1349
1350 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1351 {
1352 int flush = (1 << REISERFS_BARRIER_FLUSH);
1353 int none = (1 << REISERFS_BARRIER_NONE);
1354 int all_barrier = flush | none;
1355
1356 if (bits & all_barrier) {
1357 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1358 if (bits & flush) {
1359 REISERFS_SB(s)->s_mount_opt |= flush;
1360 printk("reiserfs: enabling write barrier flush mode\n");
1361 } else if (bits & none) {
1362 REISERFS_SB(s)->s_mount_opt |= none;
1363 printk("reiserfs: write barriers turned off\n");
1364 }
1365 }
1366 }
1367
1368 static void handle_attrs(struct super_block *s)
1369 {
1370 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1371
1372 if (reiserfs_attrs(s)) {
1373 if (old_format_only(s)) {
1374 reiserfs_warning(s, "super-6517", "cannot support "
1375 "attributes on 3.5.x disk format");
1376 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1377 return;
1378 }
1379 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1380 reiserfs_warning(s, "super-6518", "cannot support "
1381 "attributes until flag is set in "
1382 "super-block");
1383 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1384 }
1385 }
1386 }
1387
1388 #ifdef CONFIG_QUOTA
1389 static void handle_quota_files(struct super_block *s, char **qf_names,
1390 unsigned int *qfmt)
1391 {
1392 int i;
1393
1394 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1395 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1396 kfree(REISERFS_SB(s)->s_qf_names[i]);
1397 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1398 }
1399 if (*qfmt)
1400 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1401 }
1402 #endif
1403
1404 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1405 {
1406 struct reiserfs_super_block *rs;
1407 struct reiserfs_transaction_handle th;
1408 unsigned long blocks;
1409 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1410 unsigned long safe_mask = 0;
1411 unsigned int commit_max_age = (unsigned int)-1;
1412 struct reiserfs_journal *journal = SB_JOURNAL(s);
1413 char *new_opts = kstrdup(arg, GFP_KERNEL);
1414 int err;
1415 char *qf_names[REISERFS_MAXQUOTAS];
1416 unsigned int qfmt = 0;
1417 #ifdef CONFIG_QUOTA
1418 int i;
1419 #endif
1420
1421 sync_filesystem(s);
1422 reiserfs_write_lock(s);
1423
1424 #ifdef CONFIG_QUOTA
1425 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1426 #endif
1427
1428 rs = SB_DISK_SUPER_BLOCK(s);
1429
1430 if (!reiserfs_parse_options
1431 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1432 qf_names, &qfmt)) {
1433 #ifdef CONFIG_QUOTA
1434 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1435 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1436 kfree(qf_names[i]);
1437 #endif
1438 err = -EINVAL;
1439 goto out_err_unlock;
1440 }
1441 #ifdef CONFIG_QUOTA
1442 handle_quota_files(s, qf_names, &qfmt);
1443 #endif
1444
1445 handle_attrs(s);
1446
1447 /* Add options that are safe here */
1448 safe_mask |= 1 << REISERFS_SMALLTAIL;
1449 safe_mask |= 1 << REISERFS_LARGETAIL;
1450 safe_mask |= 1 << REISERFS_NO_BORDER;
1451 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1452 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1453 safe_mask |= 1 << REISERFS_TEST4;
1454 safe_mask |= 1 << REISERFS_ATTRS;
1455 safe_mask |= 1 << REISERFS_XATTRS_USER;
1456 safe_mask |= 1 << REISERFS_POSIXACL;
1457 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1458 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1459 safe_mask |= 1 << REISERFS_ERROR_RO;
1460 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1461 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1462 safe_mask |= 1 << REISERFS_USRQUOTA;
1463 safe_mask |= 1 << REISERFS_GRPQUOTA;
1464
1465 /*
1466 * Update the bitmask, taking care to keep
1467 * the bits we're not allowed to change here
1468 */
1469 REISERFS_SB(s)->s_mount_opt =
1470 (REISERFS_SB(s)->
1471 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1472
1473 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1474 journal->j_max_commit_age = commit_max_age;
1475 journal->j_max_trans_age = commit_max_age;
1476 } else if (commit_max_age == 0) {
1477 /* 0 means restore defaults. */
1478 journal->j_max_commit_age = journal->j_default_max_commit_age;
1479 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1480 }
1481
1482 if (blocks) {
1483 err = reiserfs_resize(s, blocks);
1484 if (err != 0)
1485 goto out_err_unlock;
1486 }
1487
1488 if (*mount_flags & MS_RDONLY) {
1489 reiserfs_write_unlock(s);
1490 reiserfs_xattr_init(s, *mount_flags);
1491 /* remount read-only */
1492 if (s->s_flags & MS_RDONLY)
1493 /* it is read-only already */
1494 goto out_ok_unlocked;
1495
1496 err = dquot_suspend(s, -1);
1497 if (err < 0)
1498 goto out_err;
1499
1500 /* try to remount file system with read-only permissions */
1501 if (sb_umount_state(rs) == REISERFS_VALID_FS
1502 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1503 goto out_ok_unlocked;
1504 }
1505
1506 reiserfs_write_lock(s);
1507
1508 err = journal_begin(&th, s, 10);
1509 if (err)
1510 goto out_err_unlock;
1511
1512 /* Mounting a rw partition read-only. */
1513 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1514 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1515 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1516 } else {
1517 /* remount read-write */
1518 if (!(s->s_flags & MS_RDONLY)) {
1519 reiserfs_write_unlock(s);
1520 reiserfs_xattr_init(s, *mount_flags);
1521 goto out_ok_unlocked; /* We are read-write already */
1522 }
1523
1524 if (reiserfs_is_journal_aborted(journal)) {
1525 err = journal->j_errno;
1526 goto out_err_unlock;
1527 }
1528
1529 handle_data_mode(s, mount_options);
1530 handle_barrier_mode(s, mount_options);
1531 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1532
1533 /* now it is safe to call journal_begin */
1534 s->s_flags &= ~MS_RDONLY;
1535 err = journal_begin(&th, s, 10);
1536 if (err)
1537 goto out_err_unlock;
1538
1539 /* Mount a partition which is read-only, read-write */
1540 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1541 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1542 s->s_flags &= ~MS_RDONLY;
1543 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1544 if (!old_format_only(s))
1545 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1546 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1547 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1548 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1549 }
1550 /* this will force a full flush of all journal lists */
1551 SB_JOURNAL(s)->j_must_wait = 1;
1552 err = journal_end(&th);
1553 if (err)
1554 goto out_err_unlock;
1555
1556 reiserfs_write_unlock(s);
1557 if (!(*mount_flags & MS_RDONLY)) {
1558 dquot_resume(s, -1);
1559 reiserfs_write_lock(s);
1560 finish_unfinished(s);
1561 reiserfs_write_unlock(s);
1562 reiserfs_xattr_init(s, *mount_flags);
1563 }
1564
1565 out_ok_unlocked:
1566 replace_mount_options(s, new_opts);
1567 return 0;
1568
1569 out_err_unlock:
1570 reiserfs_write_unlock(s);
1571 out_err:
1572 kfree(new_opts);
1573 return err;
1574 }
1575
1576 static int read_super_block(struct super_block *s, int offset)
1577 {
1578 struct buffer_head *bh;
1579 struct reiserfs_super_block *rs;
1580 int fs_blocksize;
1581
1582 bh = sb_bread(s, offset / s->s_blocksize);
1583 if (!bh) {
1584 reiserfs_warning(s, "sh-2006",
1585 "bread failed (dev %s, block %lu, size %lu)",
1586 s->s_id, offset / s->s_blocksize,
1587 s->s_blocksize);
1588 return 1;
1589 }
1590
1591 rs = (struct reiserfs_super_block *)bh->b_data;
1592 if (!is_any_reiserfs_magic_string(rs)) {
1593 brelse(bh);
1594 return 1;
1595 }
1596 /*
1597 * ok, reiserfs signature (old or new) found in at the given offset
1598 */
1599 fs_blocksize = sb_blocksize(rs);
1600 brelse(bh);
1601 sb_set_blocksize(s, fs_blocksize);
1602
1603 bh = sb_bread(s, offset / s->s_blocksize);
1604 if (!bh) {
1605 reiserfs_warning(s, "sh-2007",
1606 "bread failed (dev %s, block %lu, size %lu)",
1607 s->s_id, offset / s->s_blocksize,
1608 s->s_blocksize);
1609 return 1;
1610 }
1611
1612 rs = (struct reiserfs_super_block *)bh->b_data;
1613 if (sb_blocksize(rs) != s->s_blocksize) {
1614 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1615 "filesystem on (dev %s, block %llu, size %lu)",
1616 s->s_id,
1617 (unsigned long long)bh->b_blocknr,
1618 s->s_blocksize);
1619 brelse(bh);
1620 return 1;
1621 }
1622
1623 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1624 brelse(bh);
1625 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1626 "--rebuild-tree run detected. Please run\n"
1627 "reiserfsck --rebuild-tree and wait for a "
1628 "completion. If that fails\n"
1629 "get newer reiserfsprogs package");
1630 return 1;
1631 }
1632
1633 SB_BUFFER_WITH_SB(s) = bh;
1634 SB_DISK_SUPER_BLOCK(s) = rs;
1635
1636 /*
1637 * magic is of non-standard journal filesystem, look at s_version to
1638 * find which format is in use
1639 */
1640 if (is_reiserfs_jr(rs)) {
1641 if (sb_version(rs) == REISERFS_VERSION_2)
1642 reiserfs_info(s, "found reiserfs format \"3.6\""
1643 " with non-standard journal\n");
1644 else if (sb_version(rs) == REISERFS_VERSION_1)
1645 reiserfs_info(s, "found reiserfs format \"3.5\""
1646 " with non-standard journal\n");
1647 else {
1648 reiserfs_warning(s, "sh-2012", "found unknown "
1649 "format \"%u\" of reiserfs with "
1650 "non-standard magic", sb_version(rs));
1651 return 1;
1652 }
1653 } else
1654 /*
1655 * s_version of standard format may contain incorrect
1656 * information, so we just look at the magic string
1657 */
1658 reiserfs_info(s,
1659 "found reiserfs format \"%s\" with standard journal\n",
1660 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1661
1662 s->s_op = &reiserfs_sops;
1663 s->s_export_op = &reiserfs_export_ops;
1664 #ifdef CONFIG_QUOTA
1665 s->s_qcop = &reiserfs_qctl_operations;
1666 s->dq_op = &reiserfs_quota_operations;
1667 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1668 #endif
1669
1670 /*
1671 * new format is limited by the 32 bit wide i_blocks field, want to
1672 * be one full block below that.
1673 */
1674 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1675 return 0;
1676 }
1677
1678 /* after journal replay, reread all bitmap and super blocks */
1679 static int reread_meta_blocks(struct super_block *s)
1680 {
1681 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1682 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1683 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1684 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1685 return 1;
1686 }
1687
1688 return 0;
1689 }
1690
1691 /* hash detection stuff */
1692
1693 /*
1694 * if root directory is empty - we set default - Yura's - hash and
1695 * warn about it
1696 * FIXME: we look for only one name in a directory. If tea and yura
1697 * both have the same value - we ask user to send report to the
1698 * mailing list
1699 */
1700 static __u32 find_hash_out(struct super_block *s)
1701 {
1702 int retval;
1703 struct inode *inode;
1704 struct cpu_key key;
1705 INITIALIZE_PATH(path);
1706 struct reiserfs_dir_entry de;
1707 struct reiserfs_de_head *deh;
1708 __u32 hash = DEFAULT_HASH;
1709 __u32 deh_hashval, teahash, r5hash, yurahash;
1710
1711 inode = d_inode(s->s_root);
1712
1713 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1714 retval = search_by_entry_key(s, &key, &path, &de);
1715 if (retval == IO_ERROR) {
1716 pathrelse(&path);
1717 return UNSET_HASH;
1718 }
1719 if (retval == NAME_NOT_FOUND)
1720 de.de_entry_num--;
1721
1722 set_de_name_and_namelen(&de);
1723 deh = de.de_deh + de.de_entry_num;
1724
1725 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1726 /* allow override in this case */
1727 if (reiserfs_rupasov_hash(s))
1728 hash = YURA_HASH;
1729 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1730 goto out;
1731 }
1732
1733 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1734 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1735 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1736 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1737
1738 if ((teahash == r5hash && deh_hashval == r5hash) ||
1739 (teahash == yurahash && deh_hashval == yurahash) ||
1740 (r5hash == yurahash && deh_hashval == yurahash)) {
1741 reiserfs_warning(s, "reiserfs-2506",
1742 "Unable to automatically detect hash "
1743 "function. Please mount with -o "
1744 "hash={tea,rupasov,r5}");
1745 hash = UNSET_HASH;
1746 goto out;
1747 }
1748
1749 if (deh_hashval == yurahash)
1750 hash = YURA_HASH;
1751 else if (deh_hashval == teahash)
1752 hash = TEA_HASH;
1753 else if (deh_hashval == r5hash)
1754 hash = R5_HASH;
1755 else {
1756 reiserfs_warning(s, "reiserfs-2506",
1757 "Unrecognised hash function");
1758 hash = UNSET_HASH;
1759 }
1760 out:
1761 pathrelse(&path);
1762 return hash;
1763 }
1764
1765 /* finds out which hash names are sorted with */
1766 static int what_hash(struct super_block *s)
1767 {
1768 __u32 code;
1769
1770 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1771
1772 /*
1773 * reiserfs_hash_detect() == true if any of the hash mount options
1774 * were used. We must check them to make sure the user isn't
1775 * using a bad hash value
1776 */
1777 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1778 code = find_hash_out(s);
1779
1780 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1781 /*
1782 * detection has found the hash, and we must check against the
1783 * mount options
1784 */
1785 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1786 reiserfs_warning(s, "reiserfs-2507",
1787 "Error, %s hash detected, "
1788 "unable to force rupasov hash",
1789 reiserfs_hashname(code));
1790 code = UNSET_HASH;
1791 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1792 reiserfs_warning(s, "reiserfs-2508",
1793 "Error, %s hash detected, "
1794 "unable to force tea hash",
1795 reiserfs_hashname(code));
1796 code = UNSET_HASH;
1797 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1798 reiserfs_warning(s, "reiserfs-2509",
1799 "Error, %s hash detected, "
1800 "unable to force r5 hash",
1801 reiserfs_hashname(code));
1802 code = UNSET_HASH;
1803 }
1804 } else {
1805 /*
1806 * find_hash_out was not called or
1807 * could not determine the hash
1808 */
1809 if (reiserfs_rupasov_hash(s)) {
1810 code = YURA_HASH;
1811 } else if (reiserfs_tea_hash(s)) {
1812 code = TEA_HASH;
1813 } else if (reiserfs_r5_hash(s)) {
1814 code = R5_HASH;
1815 }
1816 }
1817
1818 /*
1819 * if we are mounted RW, and we have a new valid hash code, update
1820 * the super
1821 */
1822 if (code != UNSET_HASH &&
1823 !(s->s_flags & MS_RDONLY) &&
1824 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1825 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1826 }
1827 return code;
1828 }
1829
1830 /* return pointer to appropriate function */
1831 static hashf_t hash_function(struct super_block *s)
1832 {
1833 switch (what_hash(s)) {
1834 case TEA_HASH:
1835 reiserfs_info(s, "Using tea hash to sort names\n");
1836 return keyed_hash;
1837 case YURA_HASH:
1838 reiserfs_info(s, "Using rupasov hash to sort names\n");
1839 return yura_hash;
1840 case R5_HASH:
1841 reiserfs_info(s, "Using r5 hash to sort names\n");
1842 return r5_hash;
1843 }
1844 return NULL;
1845 }
1846
1847 /* this is used to set up correct value for old partitions */
1848 static int function2code(hashf_t func)
1849 {
1850 if (func == keyed_hash)
1851 return TEA_HASH;
1852 if (func == yura_hash)
1853 return YURA_HASH;
1854 if (func == r5_hash)
1855 return R5_HASH;
1856
1857 BUG(); /* should never happen */
1858
1859 return 0;
1860 }
1861
1862 #define SWARN(silent, s, id, ...) \
1863 if (!(silent)) \
1864 reiserfs_warning(s, id, __VA_ARGS__)
1865
1866 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1867 {
1868 struct inode *root_inode;
1869 struct reiserfs_transaction_handle th;
1870 int old_format = 0;
1871 unsigned long blocks;
1872 unsigned int commit_max_age = 0;
1873 int jinit_done = 0;
1874 struct reiserfs_iget_args args;
1875 struct reiserfs_super_block *rs;
1876 char *jdev_name;
1877 struct reiserfs_sb_info *sbi;
1878 int errval = -EINVAL;
1879 char *qf_names[REISERFS_MAXQUOTAS] = {};
1880 unsigned int qfmt = 0;
1881
1882 save_mount_options(s, data);
1883
1884 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1885 if (!sbi)
1886 return -ENOMEM;
1887 s->s_fs_info = sbi;
1888 /* Set default values for options: non-aggressive tails, RO on errors */
1889 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1890 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1891 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1892 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1893 sbi->s_alloc_options.preallocmin = 0;
1894 /* Preallocate by 16 blocks (17-1) at once */
1895 sbi->s_alloc_options.preallocsize = 17;
1896 /* setup default block allocator options */
1897 reiserfs_init_alloc_options(s);
1898
1899 spin_lock_init(&sbi->old_work_lock);
1900 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1901 mutex_init(&sbi->lock);
1902 sbi->lock_depth = -1;
1903
1904 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1905 s->s_id);
1906 if (!sbi->commit_wq) {
1907 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1908 errval = -ENOMEM;
1909 goto error_unlocked;
1910 }
1911
1912 jdev_name = NULL;
1913 if (reiserfs_parse_options
1914 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1915 &commit_max_age, qf_names, &qfmt) == 0) {
1916 goto error_unlocked;
1917 }
1918 if (jdev_name && jdev_name[0]) {
1919 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1920 if (!sbi->s_jdev) {
1921 SWARN(silent, s, "", "Cannot allocate memory for "
1922 "journal device name");
1923 goto error;
1924 }
1925 }
1926 #ifdef CONFIG_QUOTA
1927 handle_quota_files(s, qf_names, &qfmt);
1928 #endif
1929
1930 if (blocks) {
1931 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1932 goto error_unlocked;
1933 }
1934
1935 /*
1936 * try old format (undistributed bitmap, super block in 8-th 1k
1937 * block of a device)
1938 */
1939 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1940 old_format = 1;
1941
1942 /*
1943 * try new format (64-th 1k block), which can contain reiserfs
1944 * super block
1945 */
1946 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1947 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1948 s->s_id);
1949 goto error_unlocked;
1950 }
1951
1952 rs = SB_DISK_SUPER_BLOCK(s);
1953 /*
1954 * Let's do basic sanity check to verify that underlying device is not
1955 * smaller than the filesystem. If the check fails then abort and
1956 * scream, because bad stuff will happen otherwise.
1957 */
1958 if (s->s_bdev && s->s_bdev->bd_inode
1959 && i_size_read(s->s_bdev->bd_inode) <
1960 sb_block_count(rs) * sb_blocksize(rs)) {
1961 SWARN(silent, s, "", "Filesystem cannot be "
1962 "mounted because it is bigger than the device");
1963 SWARN(silent, s, "", "You may need to run fsck "
1964 "or increase size of your LVM partition");
1965 SWARN(silent, s, "", "Or may be you forgot to "
1966 "reboot after fdisk when it told you to");
1967 goto error_unlocked;
1968 }
1969
1970 sbi->s_mount_state = SB_REISERFS_STATE(s);
1971 sbi->s_mount_state = REISERFS_VALID_FS;
1972
1973 if ((errval = reiserfs_init_bitmap_cache(s))) {
1974 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1975 goto error_unlocked;
1976 }
1977
1978 errval = -EINVAL;
1979 #ifdef CONFIG_REISERFS_CHECK
1980 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1981 SWARN(silent, s, "", "- it is slow mode for debugging.");
1982 #endif
1983
1984 /* make data=ordered the default */
1985 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1986 !reiserfs_data_writeback(s)) {
1987 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1988 }
1989
1990 if (reiserfs_data_log(s)) {
1991 reiserfs_info(s, "using journaled data mode\n");
1992 } else if (reiserfs_data_ordered(s)) {
1993 reiserfs_info(s, "using ordered data mode\n");
1994 } else {
1995 reiserfs_info(s, "using writeback data mode\n");
1996 }
1997 if (reiserfs_barrier_flush(s)) {
1998 printk("reiserfs: using flush barriers\n");
1999 }
2000
2001 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2002 SWARN(silent, s, "sh-2022",
2003 "unable to initialize journal space");
2004 goto error_unlocked;
2005 } else {
2006 /*
2007 * once this is set, journal_release must be called
2008 * if we error out of the mount
2009 */
2010 jinit_done = 1;
2011 }
2012
2013 if (reread_meta_blocks(s)) {
2014 SWARN(silent, s, "jmacd-9",
2015 "unable to reread meta blocks after journal init");
2016 goto error_unlocked;
2017 }
2018
2019 if (replay_only(s))
2020 goto error_unlocked;
2021
2022 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2023 SWARN(silent, s, "clm-7000",
2024 "Detected readonly device, marking FS readonly");
2025 s->s_flags |= MS_RDONLY;
2026 }
2027 args.objectid = REISERFS_ROOT_OBJECTID;
2028 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2029 root_inode =
2030 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2031 reiserfs_init_locked_inode, (void *)&args);
2032 if (!root_inode) {
2033 SWARN(silent, s, "jmacd-10", "get root inode failed");
2034 goto error_unlocked;
2035 }
2036
2037 /*
2038 * This path assumed to be called with the BKL in the old times.
2039 * Now we have inherited the big reiserfs lock from it and many
2040 * reiserfs helpers called in the mount path and elsewhere require
2041 * this lock to be held even if it's not always necessary. Let's be
2042 * conservative and hold it early. The window can be reduced after
2043 * careful review of the code.
2044 */
2045 reiserfs_write_lock(s);
2046
2047 if (root_inode->i_state & I_NEW) {
2048 reiserfs_read_locked_inode(root_inode, &args);
2049 unlock_new_inode(root_inode);
2050 }
2051
2052 s->s_root = d_make_root(root_inode);
2053 if (!s->s_root)
2054 goto error;
2055 /* define and initialize hash function */
2056 sbi->s_hash_function = hash_function(s);
2057 if (sbi->s_hash_function == NULL) {
2058 dput(s->s_root);
2059 s->s_root = NULL;
2060 goto error;
2061 }
2062
2063 if (is_reiserfs_3_5(rs)
2064 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2065 set_bit(REISERFS_3_5, &sbi->s_properties);
2066 else if (old_format)
2067 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2068 else
2069 set_bit(REISERFS_3_6, &sbi->s_properties);
2070
2071 if (!(s->s_flags & MS_RDONLY)) {
2072
2073 errval = journal_begin(&th, s, 1);
2074 if (errval) {
2075 dput(s->s_root);
2076 s->s_root = NULL;
2077 goto error;
2078 }
2079 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2080
2081 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2082 set_sb_fs_state(rs, 0);
2083
2084 /*
2085 * Clear out s_bmap_nr if it would wrap. We can handle this
2086 * case, but older revisions can't. This will cause the
2087 * file system to fail mount on those older implementations,
2088 * avoiding corruption. -jeffm
2089 */
2090 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2091 sb_bmap_nr(rs) != 0) {
2092 reiserfs_warning(s, "super-2030", "This file system "
2093 "claims to use %u bitmap blocks in "
2094 "its super block, but requires %u. "
2095 "Clearing to zero.", sb_bmap_nr(rs),
2096 reiserfs_bmap_count(s));
2097
2098 set_sb_bmap_nr(rs, 0);
2099 }
2100
2101 if (old_format_only(s)) {
2102 /*
2103 * filesystem of format 3.5 either with standard
2104 * or non-standard journal
2105 */
2106 if (convert_reiserfs(s)) {
2107 /* and -o conv is given */
2108 if (!silent)
2109 reiserfs_info(s,
2110 "converting 3.5 filesystem to the 3.6 format");
2111
2112 if (is_reiserfs_3_5(rs))
2113 /*
2114 * put magic string of 3.6 format.
2115 * 2.2 will not be able to
2116 * mount this filesystem anymore
2117 */
2118 memcpy(rs->s_v1.s_magic,
2119 reiserfs_3_6_magic_string,
2120 sizeof
2121 (reiserfs_3_6_magic_string));
2122
2123 set_sb_version(rs, REISERFS_VERSION_2);
2124 reiserfs_convert_objectid_map_v1(s);
2125 set_bit(REISERFS_3_6, &sbi->s_properties);
2126 clear_bit(REISERFS_3_5, &sbi->s_properties);
2127 } else if (!silent) {
2128 reiserfs_info(s, "using 3.5.x disk format\n");
2129 }
2130 } else
2131 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2132
2133
2134 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2135 errval = journal_end(&th);
2136 if (errval) {
2137 dput(s->s_root);
2138 s->s_root = NULL;
2139 goto error;
2140 }
2141
2142 reiserfs_write_unlock(s);
2143 if ((errval = reiserfs_lookup_privroot(s)) ||
2144 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2145 dput(s->s_root);
2146 s->s_root = NULL;
2147 goto error_unlocked;
2148 }
2149 reiserfs_write_lock(s);
2150
2151 /*
2152 * look for files which were to be removed in previous session
2153 */
2154 finish_unfinished(s);
2155 } else {
2156 if (old_format_only(s) && !silent) {
2157 reiserfs_info(s, "using 3.5.x disk format\n");
2158 }
2159
2160 reiserfs_write_unlock(s);
2161 if ((errval = reiserfs_lookup_privroot(s)) ||
2162 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2163 dput(s->s_root);
2164 s->s_root = NULL;
2165 goto error_unlocked;
2166 }
2167 reiserfs_write_lock(s);
2168 }
2169 /*
2170 * mark hash in super block: it could be unset. overwrite should be ok
2171 */
2172 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2173
2174 handle_attrs(s);
2175
2176 reiserfs_proc_info_init(s);
2177
2178 init_waitqueue_head(&(sbi->s_wait));
2179 spin_lock_init(&sbi->bitmap_lock);
2180
2181 reiserfs_write_unlock(s);
2182
2183 return (0);
2184
2185 error:
2186 reiserfs_write_unlock(s);
2187
2188 error_unlocked:
2189 /* kill the commit thread, free journal ram */
2190 if (jinit_done) {
2191 reiserfs_write_lock(s);
2192 journal_release_error(NULL, s);
2193 reiserfs_write_unlock(s);
2194 }
2195
2196 if (sbi->commit_wq)
2197 destroy_workqueue(sbi->commit_wq);
2198
2199 reiserfs_cancel_old_flush(s);
2200
2201 reiserfs_free_bitmap_cache(s);
2202 if (SB_BUFFER_WITH_SB(s))
2203 brelse(SB_BUFFER_WITH_SB(s));
2204 #ifdef CONFIG_QUOTA
2205 {
2206 int j;
2207 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2208 kfree(qf_names[j]);
2209 }
2210 #endif
2211 kfree(sbi);
2212
2213 s->s_fs_info = NULL;
2214 return errval;
2215 }
2216
2217 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2218 {
2219 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2220
2221 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2222 buf->f_bfree = sb_free_blocks(rs);
2223 buf->f_bavail = buf->f_bfree;
2224 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2225 buf->f_bsize = dentry->d_sb->s_blocksize;
2226 /* changed to accommodate gcc folks. */
2227 buf->f_type = REISERFS_SUPER_MAGIC;
2228 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2229 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2230 sizeof(rs->s_uuid)/2);
2231
2232 return 0;
2233 }
2234
2235 #ifdef CONFIG_QUOTA
2236 static int reiserfs_write_dquot(struct dquot *dquot)
2237 {
2238 struct reiserfs_transaction_handle th;
2239 int ret, err;
2240 int depth;
2241
2242 reiserfs_write_lock(dquot->dq_sb);
2243 ret =
2244 journal_begin(&th, dquot->dq_sb,
2245 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2246 if (ret)
2247 goto out;
2248 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2249 ret = dquot_commit(dquot);
2250 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2251 err = journal_end(&th);
2252 if (!ret && err)
2253 ret = err;
2254 out:
2255 reiserfs_write_unlock(dquot->dq_sb);
2256 return ret;
2257 }
2258
2259 static int reiserfs_acquire_dquot(struct dquot *dquot)
2260 {
2261 struct reiserfs_transaction_handle th;
2262 int ret, err;
2263 int depth;
2264
2265 reiserfs_write_lock(dquot->dq_sb);
2266 ret =
2267 journal_begin(&th, dquot->dq_sb,
2268 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2269 if (ret)
2270 goto out;
2271 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2272 ret = dquot_acquire(dquot);
2273 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2274 err = journal_end(&th);
2275 if (!ret && err)
2276 ret = err;
2277 out:
2278 reiserfs_write_unlock(dquot->dq_sb);
2279 return ret;
2280 }
2281
2282 static int reiserfs_release_dquot(struct dquot *dquot)
2283 {
2284 struct reiserfs_transaction_handle th;
2285 int ret, err;
2286
2287 reiserfs_write_lock(dquot->dq_sb);
2288 ret =
2289 journal_begin(&th, dquot->dq_sb,
2290 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2291 reiserfs_write_unlock(dquot->dq_sb);
2292 if (ret) {
2293 /* Release dquot anyway to avoid endless cycle in dqput() */
2294 dquot_release(dquot);
2295 goto out;
2296 }
2297 ret = dquot_release(dquot);
2298 reiserfs_write_lock(dquot->dq_sb);
2299 err = journal_end(&th);
2300 if (!ret && err)
2301 ret = err;
2302 reiserfs_write_unlock(dquot->dq_sb);
2303 out:
2304 return ret;
2305 }
2306
2307 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2308 {
2309 /* Are we journaling quotas? */
2310 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2311 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2312 dquot_mark_dquot_dirty(dquot);
2313 return reiserfs_write_dquot(dquot);
2314 } else
2315 return dquot_mark_dquot_dirty(dquot);
2316 }
2317
2318 static int reiserfs_write_info(struct super_block *sb, int type)
2319 {
2320 struct reiserfs_transaction_handle th;
2321 int ret, err;
2322 int depth;
2323
2324 /* Data block + inode block */
2325 reiserfs_write_lock(sb);
2326 ret = journal_begin(&th, sb, 2);
2327 if (ret)
2328 goto out;
2329 depth = reiserfs_write_unlock_nested(sb);
2330 ret = dquot_commit_info(sb, type);
2331 reiserfs_write_lock_nested(sb, depth);
2332 err = journal_end(&th);
2333 if (!ret && err)
2334 ret = err;
2335 out:
2336 reiserfs_write_unlock(sb);
2337 return ret;
2338 }
2339
2340 /*
2341 * Turn on quotas during mount time - we need to find the quota file and such...
2342 */
2343 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2344 {
2345 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2346 REISERFS_SB(sb)->s_jquota_fmt, type);
2347 }
2348
2349 /*
2350 * Standard function to be called on quota_on
2351 */
2352 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2353 struct path *path)
2354 {
2355 int err;
2356 struct inode *inode;
2357 struct reiserfs_transaction_handle th;
2358 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2359
2360 reiserfs_write_lock(sb);
2361 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2362 err = -EINVAL;
2363 goto out;
2364 }
2365
2366 /* Quotafile not on the same filesystem? */
2367 if (path->dentry->d_sb != sb) {
2368 err = -EXDEV;
2369 goto out;
2370 }
2371 inode = d_inode(path->dentry);
2372 /*
2373 * We must not pack tails for quota files on reiserfs for quota
2374 * IO to work
2375 */
2376 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2377 err = reiserfs_unpack(inode, NULL);
2378 if (err) {
2379 reiserfs_warning(sb, "super-6520",
2380 "Unpacking tail of quota file failed"
2381 " (%d). Cannot turn on quotas.", err);
2382 err = -EINVAL;
2383 goto out;
2384 }
2385 mark_inode_dirty(inode);
2386 }
2387 /* Journaling quota? */
2388 if (REISERFS_SB(sb)->s_qf_names[type]) {
2389 /* Quotafile not of fs root? */
2390 if (path->dentry->d_parent != sb->s_root)
2391 reiserfs_warning(sb, "super-6521",
2392 "Quota file not on filesystem root. "
2393 "Journalled quota will not work.");
2394 }
2395
2396 /*
2397 * When we journal data on quota file, we have to flush journal to see
2398 * all updates to the file when we bypass pagecache...
2399 */
2400 if (reiserfs_file_data_log(inode)) {
2401 /* Just start temporary transaction and finish it */
2402 err = journal_begin(&th, sb, 1);
2403 if (err)
2404 goto out;
2405 err = journal_end_sync(&th);
2406 if (err)
2407 goto out;
2408 }
2409 reiserfs_write_unlock(sb);
2410 return dquot_quota_on(sb, type, format_id, path);
2411 out:
2412 reiserfs_write_unlock(sb);
2413 return err;
2414 }
2415
2416 /*
2417 * Read data from quotafile - avoid pagecache and such because we cannot afford
2418 * acquiring the locks... As quota files are never truncated and quota code
2419 * itself serializes the operations (and no one else should touch the files)
2420 * we don't have to be afraid of races
2421 */
2422 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2423 size_t len, loff_t off)
2424 {
2425 struct inode *inode = sb_dqopt(sb)->files[type];
2426 unsigned long blk = off >> sb->s_blocksize_bits;
2427 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2428 size_t toread;
2429 struct buffer_head tmp_bh, *bh;
2430 loff_t i_size = i_size_read(inode);
2431
2432 if (off > i_size)
2433 return 0;
2434 if (off + len > i_size)
2435 len = i_size - off;
2436 toread = len;
2437 while (toread > 0) {
2438 tocopy =
2439 sb->s_blocksize - offset <
2440 toread ? sb->s_blocksize - offset : toread;
2441 tmp_bh.b_state = 0;
2442 /*
2443 * Quota files are without tails so we can safely
2444 * use this function
2445 */
2446 reiserfs_write_lock(sb);
2447 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2448 reiserfs_write_unlock(sb);
2449 if (err)
2450 return err;
2451 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2452 memset(data, 0, tocopy);
2453 else {
2454 bh = sb_bread(sb, tmp_bh.b_blocknr);
2455 if (!bh)
2456 return -EIO;
2457 memcpy(data, bh->b_data + offset, tocopy);
2458 brelse(bh);
2459 }
2460 offset = 0;
2461 toread -= tocopy;
2462 data += tocopy;
2463 blk++;
2464 }
2465 return len;
2466 }
2467
2468 /*
2469 * Write to quotafile (we know the transaction is already started and has
2470 * enough credits)
2471 */
2472 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2473 const char *data, size_t len, loff_t off)
2474 {
2475 struct inode *inode = sb_dqopt(sb)->files[type];
2476 unsigned long blk = off >> sb->s_blocksize_bits;
2477 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2478 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2479 size_t towrite = len;
2480 struct buffer_head tmp_bh, *bh;
2481
2482 if (!current->journal_info) {
2483 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2484 (unsigned long long)off, (unsigned long long)len);
2485 return -EIO;
2486 }
2487 while (towrite > 0) {
2488 tocopy = sb->s_blocksize - offset < towrite ?
2489 sb->s_blocksize - offset : towrite;
2490 tmp_bh.b_state = 0;
2491 reiserfs_write_lock(sb);
2492 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2493 reiserfs_write_unlock(sb);
2494 if (err)
2495 goto out;
2496 if (offset || tocopy != sb->s_blocksize)
2497 bh = sb_bread(sb, tmp_bh.b_blocknr);
2498 else
2499 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2500 if (!bh) {
2501 err = -EIO;
2502 goto out;
2503 }
2504 lock_buffer(bh);
2505 memcpy(bh->b_data + offset, data, tocopy);
2506 flush_dcache_page(bh->b_page);
2507 set_buffer_uptodate(bh);
2508 unlock_buffer(bh);
2509 reiserfs_write_lock(sb);
2510 reiserfs_prepare_for_journal(sb, bh, 1);
2511 journal_mark_dirty(current->journal_info, bh);
2512 if (!journal_quota)
2513 reiserfs_add_ordered_list(inode, bh);
2514 reiserfs_write_unlock(sb);
2515 brelse(bh);
2516 offset = 0;
2517 towrite -= tocopy;
2518 data += tocopy;
2519 blk++;
2520 }
2521 out:
2522 if (len == towrite)
2523 return err;
2524 if (inode->i_size < off + len - towrite)
2525 i_size_write(inode, off + len - towrite);
2526 inode->i_version++;
2527 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2528 mark_inode_dirty(inode);
2529 return len - towrite;
2530 }
2531
2532 #endif
2533
2534 static struct dentry *get_super_block(struct file_system_type *fs_type,
2535 int flags, const char *dev_name,
2536 void *data)
2537 {
2538 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2539 }
2540
2541 static int __init init_reiserfs_fs(void)
2542 {
2543 int ret;
2544
2545 ret = init_inodecache();
2546 if (ret)
2547 return ret;
2548
2549 reiserfs_proc_info_global_init();
2550
2551 ret = register_filesystem(&reiserfs_fs_type);
2552 if (ret)
2553 goto out;
2554
2555 return 0;
2556 out:
2557 reiserfs_proc_info_global_done();
2558 destroy_inodecache();
2559
2560 return ret;
2561 }
2562
2563 static void __exit exit_reiserfs_fs(void)
2564 {
2565 reiserfs_proc_info_global_done();
2566 unregister_filesystem(&reiserfs_fs_type);
2567 destroy_inodecache();
2568 }
2569
2570 struct file_system_type reiserfs_fs_type = {
2571 .owner = THIS_MODULE,
2572 .name = "reiserfs",
2573 .mount = get_super_block,
2574 .kill_sb = reiserfs_kill_sb,
2575 .fs_flags = FS_REQUIRES_DEV,
2576 };
2577 MODULE_ALIAS_FS("reiserfs");
2578
2579 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2580 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2581 MODULE_LICENSE("GPL");
2582
2583 module_init(init_reiserfs_fs);
2584 module_exit(exit_reiserfs_fs);
Linux with added FPC-III support