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HID: wacom: Call 'wacom_query_tablet_data' only after 'hid_hw_start'
[linux/fpc-iii.git] / fs / reiserfs / super.c
blob0e4cf728126f2b164b6f0b2f878d4ab26ad4dbb8
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 sbi->work_queued = 0;
94 spin_unlock(&sbi->old_work_lock);
95
96 reiserfs_sync_fs(s, 1);
97 }
98
99 void reiserfs_schedule_old_flush(struct super_block *s)
100 {
101 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
102 unsigned long delay;
103
104 /*
105 * Avoid scheduling flush when sb is being shut down. It can race
106 * with journal shutdown and free still queued delayed work.
107 */
108 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
109 return;
110
111 spin_lock(&sbi->old_work_lock);
112 if (!sbi->work_queued) {
113 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
114 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
115 sbi->work_queued = 1;
116 }
117 spin_unlock(&sbi->old_work_lock);
118 }
119
120 static void cancel_old_flush(struct super_block *s)
121 {
122 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
123
124 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
125 spin_lock(&sbi->old_work_lock);
126 sbi->work_queued = 0;
127 spin_unlock(&sbi->old_work_lock);
128 }
129
130 static int reiserfs_freeze(struct super_block *s)
131 {
132 struct reiserfs_transaction_handle th;
133
134 cancel_old_flush(s);
135
136 reiserfs_write_lock(s);
137 if (!(s->s_flags & MS_RDONLY)) {
138 int err = journal_begin(&th, s, 1);
139 if (err) {
140 reiserfs_block_writes(&th);
141 } else {
142 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
143 1);
144 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
145 reiserfs_block_writes(&th);
146 journal_end_sync(&th);
147 }
148 }
149 reiserfs_write_unlock(s);
150 return 0;
151 }
152
153 static int reiserfs_unfreeze(struct super_block *s)
154 {
155 reiserfs_allow_writes(s);
156 return 0;
157 }
158
159 extern const struct in_core_key MAX_IN_CORE_KEY;
160
161 /*
162 * this is used to delete "save link" when there are no items of a
163 * file it points to. It can either happen if unlink is completed but
164 * "save unlink" removal, or if file has both unlink and truncate
165 * pending and as unlink completes first (because key of "save link"
166 * protecting unlink is bigger that a key lf "save link" which
167 * protects truncate), so there left no items to make truncate
168 * completion on
169 */
170 static int remove_save_link_only(struct super_block *s,
171 struct reiserfs_key *key, int oid_free)
172 {
173 struct reiserfs_transaction_handle th;
174 int err;
175
176 /* we are going to do one balancing */
177 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
178 if (err)
179 return err;
180
181 reiserfs_delete_solid_item(&th, NULL, key);
182 if (oid_free)
183 /* removals are protected by direct items */
184 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
185
186 return journal_end(&th);
187 }
188
189 #ifdef CONFIG_QUOTA
190 static int reiserfs_quota_on_mount(struct super_block *, int);
191 #endif
192
193 /* look for uncompleted unlinks and truncates and complete them */
194 static int finish_unfinished(struct super_block *s)
195 {
196 INITIALIZE_PATH(path);
197 struct cpu_key max_cpu_key, obj_key;
198 struct reiserfs_key save_link_key, last_inode_key;
199 int retval = 0;
200 struct item_head *ih;
201 struct buffer_head *bh;
202 int item_pos;
203 char *item;
204 int done;
205 struct inode *inode;
206 int truncate;
207 #ifdef CONFIG_QUOTA
208 int i;
209 int ms_active_set;
210 int quota_enabled[REISERFS_MAXQUOTAS];
211 #endif
212
213 /* compose key to look for "save" links */
214 max_cpu_key.version = KEY_FORMAT_3_5;
215 max_cpu_key.on_disk_key.k_dir_id = ~0U;
216 max_cpu_key.on_disk_key.k_objectid = ~0U;
217 set_cpu_key_k_offset(&max_cpu_key, ~0U);
218 max_cpu_key.key_length = 3;
219
220 memset(&last_inode_key, 0, sizeof(last_inode_key));
221
222 #ifdef CONFIG_QUOTA
223 /* Needed for iput() to work correctly and not trash data */
224 if (s->s_flags & MS_ACTIVE) {
225 ms_active_set = 0;
226 } else {
227 ms_active_set = 1;
228 s->s_flags |= MS_ACTIVE;
229 }
230 /* Turn on quotas so that they are updated correctly */
231 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
232 quota_enabled[i] = 1;
233 if (REISERFS_SB(s)->s_qf_names[i]) {
234 int ret;
235
236 if (sb_has_quota_active(s, i)) {
237 quota_enabled[i] = 0;
238 continue;
239 }
240 ret = reiserfs_quota_on_mount(s, i);
241 if (ret < 0)
242 reiserfs_warning(s, "reiserfs-2500",
243 "cannot turn on journaled "
244 "quota: error %d", ret);
245 }
246 }
247 #endif
248
249 done = 0;
250 REISERFS_SB(s)->s_is_unlinked_ok = 1;
251 while (!retval) {
252 int depth;
253 retval = search_item(s, &max_cpu_key, &path);
254 if (retval != ITEM_NOT_FOUND) {
255 reiserfs_error(s, "vs-2140",
256 "search_by_key returned %d", retval);
257 break;
258 }
259
260 bh = get_last_bh(&path);
261 item_pos = get_item_pos(&path);
262 if (item_pos != B_NR_ITEMS(bh)) {
263 reiserfs_warning(s, "vs-2060",
264 "wrong position found");
265 break;
266 }
267 item_pos--;
268 ih = item_head(bh, item_pos);
269
270 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
271 /* there are no "save" links anymore */
272 break;
273
274 save_link_key = ih->ih_key;
275 if (is_indirect_le_ih(ih))
276 truncate = 1;
277 else
278 truncate = 0;
279
280 /* reiserfs_iget needs k_dirid and k_objectid only */
281 item = ih_item_body(bh, ih);
282 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
283 obj_key.on_disk_key.k_objectid =
284 le32_to_cpu(ih->ih_key.k_objectid);
285 obj_key.on_disk_key.k_offset = 0;
286 obj_key.on_disk_key.k_type = 0;
287
288 pathrelse(&path);
289
290 inode = reiserfs_iget(s, &obj_key);
291 if (!inode) {
292 /*
293 * the unlink almost completed, it just did not
294 * manage to remove "save" link and release objectid
295 */
296 reiserfs_warning(s, "vs-2180", "iget failed for %K",
297 &obj_key);
298 retval = remove_save_link_only(s, &save_link_key, 1);
299 continue;
300 }
301
302 if (!truncate && inode->i_nlink) {
303 /* file is not unlinked */
304 reiserfs_warning(s, "vs-2185",
305 "file %K is not unlinked",
306 &obj_key);
307 retval = remove_save_link_only(s, &save_link_key, 0);
308 continue;
309 }
310 depth = reiserfs_write_unlock_nested(inode->i_sb);
311 dquot_initialize(inode);
312 reiserfs_write_lock_nested(inode->i_sb, depth);
313
314 if (truncate && S_ISDIR(inode->i_mode)) {
315 /*
316 * We got a truncate request for a dir which
317 * is impossible. The only imaginable way is to
318 * execute unfinished truncate request then boot
319 * into old kernel, remove the file and create dir
320 * with the same key.
321 */
322 reiserfs_warning(s, "green-2101",
323 "impossible truncate on a "
324 "directory %k. Please report",
325 INODE_PKEY(inode));
326 retval = remove_save_link_only(s, &save_link_key, 0);
327 truncate = 0;
328 iput(inode);
329 continue;
330 }
331
332 if (truncate) {
333 REISERFS_I(inode)->i_flags |=
334 i_link_saved_truncate_mask;
335 /*
336 * not completed truncate found. New size was
337 * committed together with "save" link
338 */
339 reiserfs_info(s, "Truncating %k to %lld ..",
340 INODE_PKEY(inode), inode->i_size);
341
342 /* don't update modification time */
343 reiserfs_truncate_file(inode, 0);
344
345 retval = remove_save_link(inode, truncate);
346 } else {
347 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
348 /* not completed unlink (rmdir) found */
349 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
350 if (memcmp(&last_inode_key, INODE_PKEY(inode),
351 sizeof(last_inode_key))){
352 last_inode_key = *INODE_PKEY(inode);
353 /* removal gets completed in iput */
354 retval = 0;
355 } else {
356 reiserfs_warning(s, "super-2189", "Dead loop "
357 "in finish_unfinished "
358 "detected, just remove "
359 "save link\n");
360 retval = remove_save_link_only(s,
361 &save_link_key, 0);
362 }
363 }
364
365 iput(inode);
366 printk("done\n");
367 done++;
368 }
369 REISERFS_SB(s)->s_is_unlinked_ok = 0;
370
371 #ifdef CONFIG_QUOTA
372 /* Turn quotas off */
373 reiserfs_write_unlock(s);
374 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
375 if (sb_dqopt(s)->files[i] && quota_enabled[i])
376 dquot_quota_off(s, i);
377 }
378 reiserfs_write_lock(s);
379 if (ms_active_set)
380 /* Restore the flag back */
381 s->s_flags &= ~MS_ACTIVE;
382 #endif
383 pathrelse(&path);
384 if (done)
385 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
386 "Completed\n", done);
387 return retval;
388 }
389
390 /*
391 * to protect file being unlinked from getting lost we "safe" link files
392 * being unlinked. This link will be deleted in the same transaction with last
393 * item of file. mounting the filesystem we scan all these links and remove
394 * files which almost got lost
395 */
396 void add_save_link(struct reiserfs_transaction_handle *th,
397 struct inode *inode, int truncate)
398 {
399 INITIALIZE_PATH(path);
400 int retval;
401 struct cpu_key key;
402 struct item_head ih;
403 __le32 link;
404
405 BUG_ON(!th->t_trans_id);
406
407 /* file can only get one "save link" of each kind */
408 RFALSE(truncate &&
409 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
410 "saved link already exists for truncated inode %lx",
411 (long)inode->i_ino);
412 RFALSE(!truncate &&
413 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
414 "saved link already exists for unlinked inode %lx",
415 (long)inode->i_ino);
416
417 /* setup key of "save" link */
418 key.version = KEY_FORMAT_3_5;
419 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
420 key.on_disk_key.k_objectid = inode->i_ino;
421 if (!truncate) {
422 /* unlink, rmdir, rename */
423 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
424 set_cpu_key_k_type(&key, TYPE_DIRECT);
425
426 /* item head of "safe" link */
427 make_le_item_head(&ih, &key, key.version,
428 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
429 4 /*length */ , 0xffff /*free space */ );
430 } else {
431 /* truncate */
432 if (S_ISDIR(inode->i_mode))
433 reiserfs_warning(inode->i_sb, "green-2102",
434 "Adding a truncate savelink for "
435 "a directory %k! Please report",
436 INODE_PKEY(inode));
437 set_cpu_key_k_offset(&key, 1);
438 set_cpu_key_k_type(&key, TYPE_INDIRECT);
439
440 /* item head of "safe" link */
441 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
442 4 /*length */ , 0 /*free space */ );
443 }
444 key.key_length = 3;
445
446 /* look for its place in the tree */
447 retval = search_item(inode->i_sb, &key, &path);
448 if (retval != ITEM_NOT_FOUND) {
449 if (retval != -ENOSPC)
450 reiserfs_error(inode->i_sb, "vs-2100",
451 "search_by_key (%K) returned %d", &key,
452 retval);
453 pathrelse(&path);
454 return;
455 }
456
457 /* body of "save" link */
458 link = INODE_PKEY(inode)->k_dir_id;
459
460 /* put "save" link into tree, don't charge quota to anyone */
461 retval =
462 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
463 if (retval) {
464 if (retval != -ENOSPC)
465 reiserfs_error(inode->i_sb, "vs-2120",
466 "insert_item returned %d", retval);
467 } else {
468 if (truncate)
469 REISERFS_I(inode)->i_flags |=
470 i_link_saved_truncate_mask;
471 else
472 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
473 }
474 }
475
476 /* this opens transaction unlike add_save_link */
477 int remove_save_link(struct inode *inode, int truncate)
478 {
479 struct reiserfs_transaction_handle th;
480 struct reiserfs_key key;
481 int err;
482
483 /* we are going to do one balancing only */
484 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
485 if (err)
486 return err;
487
488 /* setup key of "save" link */
489 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
490 key.k_objectid = INODE_PKEY(inode)->k_objectid;
491 if (!truncate) {
492 /* unlink, rmdir, rename */
493 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
494 1 + inode->i_sb->s_blocksize);
495 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
496 } else {
497 /* truncate */
498 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
499 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
500 }
501
502 if ((truncate &&
503 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
504 (!truncate &&
505 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
506 /* don't take quota bytes from anywhere */
507 reiserfs_delete_solid_item(&th, NULL, &key);
508 if (!truncate) {
509 reiserfs_release_objectid(&th, inode->i_ino);
510 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
511 } else
512 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
513
514 return journal_end(&th);
515 }
516
517 static void reiserfs_kill_sb(struct super_block *s)
518 {
519 if (REISERFS_SB(s)) {
520 reiserfs_proc_info_done(s);
521 /*
522 * Force any pending inode evictions to occur now. Any
523 * inodes to be removed that have extended attributes
524 * associated with them need to clean them up before
525 * we can release the extended attribute root dentries.
526 * shrink_dcache_for_umount will BUG if we don't release
527 * those before it's called so ->put_super is too late.
528 */
529 shrink_dcache_sb(s);
530
531 dput(REISERFS_SB(s)->xattr_root);
532 REISERFS_SB(s)->xattr_root = NULL;
533 dput(REISERFS_SB(s)->priv_root);
534 REISERFS_SB(s)->priv_root = NULL;
535 }
536
537 kill_block_super(s);
538 }
539
540 static void reiserfs_put_super(struct super_block *s)
541 {
542 struct reiserfs_transaction_handle th;
543 th.t_trans_id = 0;
544
545 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
546
547 reiserfs_write_lock(s);
548
549 /*
550 * change file system state to current state if it was mounted
551 * with read-write permissions
552 */
553 if (!(s->s_flags & MS_RDONLY)) {
554 if (!journal_begin(&th, s, 10)) {
555 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
556 1);
557 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
558 REISERFS_SB(s)->s_mount_state);
559 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
560 }
561 }
562
563 /*
564 * note, journal_release checks for readonly mount, and can
565 * decide not to do a journal_end
566 */
567 journal_release(&th, s);
568
569 reiserfs_free_bitmap_cache(s);
570
571 brelse(SB_BUFFER_WITH_SB(s));
572
573 print_statistics(s);
574
575 if (REISERFS_SB(s)->reserved_blocks != 0) {
576 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
577 REISERFS_SB(s)->reserved_blocks);
578 }
579
580 reiserfs_write_unlock(s);
581 mutex_destroy(&REISERFS_SB(s)->lock);
582 destroy_workqueue(REISERFS_SB(s)->commit_wq);
583 kfree(s->s_fs_info);
584 s->s_fs_info = NULL;
585 }
586
587 static struct kmem_cache *reiserfs_inode_cachep;
588
589 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
590 {
591 struct reiserfs_inode_info *ei;
592 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
593 if (!ei)
594 return NULL;
595 atomic_set(&ei->openers, 0);
596 mutex_init(&ei->tailpack);
597 #ifdef CONFIG_QUOTA
598 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
599 #endif
600
601 return &ei->vfs_inode;
602 }
603
604 static void reiserfs_i_callback(struct rcu_head *head)
605 {
606 struct inode *inode = container_of(head, struct inode, i_rcu);
607 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
608 }
609
610 static void reiserfs_destroy_inode(struct inode *inode)
611 {
612 call_rcu(&inode->i_rcu, reiserfs_i_callback);
613 }
614
615 static void init_once(void *foo)
616 {
617 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
618
619 INIT_LIST_HEAD(&ei->i_prealloc_list);
620 inode_init_once(&ei->vfs_inode);
621 }
622
623 static int __init init_inodecache(void)
624 {
625 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
626 sizeof(struct
627 reiserfs_inode_info),
628 0, (SLAB_RECLAIM_ACCOUNT|
629 SLAB_MEM_SPREAD),
630 init_once);
631 if (reiserfs_inode_cachep == NULL)
632 return -ENOMEM;
633 return 0;
634 }
635
636 static void destroy_inodecache(void)
637 {
638 /*
639 * Make sure all delayed rcu free inodes are flushed before we
640 * destroy cache.
641 */
642 rcu_barrier();
643 kmem_cache_destroy(reiserfs_inode_cachep);
644 }
645
646 /* we don't mark inodes dirty, we just log them */
647 static void reiserfs_dirty_inode(struct inode *inode, int flags)
648 {
649 struct reiserfs_transaction_handle th;
650
651 int err = 0;
652
653 if (inode->i_sb->s_flags & MS_RDONLY) {
654 reiserfs_warning(inode->i_sb, "clm-6006",
655 "writing inode %lu on readonly FS",
656 inode->i_ino);
657 return;
658 }
659 reiserfs_write_lock(inode->i_sb);
660
661 /*
662 * this is really only used for atime updates, so they don't have
663 * to be included in O_SYNC or fsync
664 */
665 err = journal_begin(&th, inode->i_sb, 1);
666 if (err)
667 goto out;
668
669 reiserfs_update_sd(&th, inode);
670 journal_end(&th);
671
672 out:
673 reiserfs_write_unlock(inode->i_sb);
674 }
675
676 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
677 {
678 struct super_block *s = root->d_sb;
679 struct reiserfs_journal *journal = SB_JOURNAL(s);
680 long opts = REISERFS_SB(s)->s_mount_opt;
681
682 if (opts & (1 << REISERFS_LARGETAIL))
683 seq_puts(seq, ",tails=on");
684 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
685 seq_puts(seq, ",notail");
686 /* tails=small is default so we don't show it */
687
688 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
689 seq_puts(seq, ",barrier=none");
690 /* barrier=flush is default so we don't show it */
691
692 if (opts & (1 << REISERFS_ERROR_CONTINUE))
693 seq_puts(seq, ",errors=continue");
694 else if (opts & (1 << REISERFS_ERROR_PANIC))
695 seq_puts(seq, ",errors=panic");
696 /* errors=ro is default so we don't show it */
697
698 if (opts & (1 << REISERFS_DATA_LOG))
699 seq_puts(seq, ",data=journal");
700 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
701 seq_puts(seq, ",data=writeback");
702 /* data=ordered is default so we don't show it */
703
704 if (opts & (1 << REISERFS_ATTRS))
705 seq_puts(seq, ",attrs");
706
707 if (opts & (1 << REISERFS_XATTRS_USER))
708 seq_puts(seq, ",user_xattr");
709
710 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
711 seq_puts(seq, ",expose_privroot");
712
713 if (opts & (1 << REISERFS_POSIXACL))
714 seq_puts(seq, ",acl");
715
716 if (REISERFS_SB(s)->s_jdev)
717 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
718
719 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
720 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
721
722 #ifdef CONFIG_QUOTA
723 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
724 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
725 else if (opts & (1 << REISERFS_USRQUOTA))
726 seq_puts(seq, ",usrquota");
727 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
728 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
729 else if (opts & (1 << REISERFS_GRPQUOTA))
730 seq_puts(seq, ",grpquota");
731 if (REISERFS_SB(s)->s_jquota_fmt) {
732 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
733 seq_puts(seq, ",jqfmt=vfsold");
734 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
735 seq_puts(seq, ",jqfmt=vfsv0");
736 }
737 #endif
738
739 /* Block allocator options */
740 if (opts & (1 << REISERFS_NO_BORDER))
741 seq_puts(seq, ",block-allocator=noborder");
742 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
743 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
744 if (opts & (1 << REISERFS_HASHED_RELOCATION))
745 seq_puts(seq, ",block-allocator=hashed_relocation");
746 if (opts & (1 << REISERFS_TEST4))
747 seq_puts(seq, ",block-allocator=test4");
748 show_alloc_options(seq, s);
749 return 0;
750 }
751
752 #ifdef CONFIG_QUOTA
753 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
754 size_t, loff_t);
755 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
756 loff_t);
757
758 static struct dquot **reiserfs_get_dquots(struct inode *inode)
759 {
760 return REISERFS_I(inode)->i_dquot;
761 }
762 #endif
763
764 static const struct super_operations reiserfs_sops = {
765 .alloc_inode = reiserfs_alloc_inode,
766 .destroy_inode = reiserfs_destroy_inode,
767 .write_inode = reiserfs_write_inode,
768 .dirty_inode = reiserfs_dirty_inode,
769 .evict_inode = reiserfs_evict_inode,
770 .put_super = reiserfs_put_super,
771 .sync_fs = reiserfs_sync_fs,
772 .freeze_fs = reiserfs_freeze,
773 .unfreeze_fs = reiserfs_unfreeze,
774 .statfs = reiserfs_statfs,
775 .remount_fs = reiserfs_remount,
776 .show_options = reiserfs_show_options,
777 #ifdef CONFIG_QUOTA
778 .quota_read = reiserfs_quota_read,
779 .quota_write = reiserfs_quota_write,
780 .get_dquots = reiserfs_get_dquots,
781 #endif
782 };
783
784 #ifdef CONFIG_QUOTA
785 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
786
787 static int reiserfs_write_dquot(struct dquot *);
788 static int reiserfs_acquire_dquot(struct dquot *);
789 static int reiserfs_release_dquot(struct dquot *);
790 static int reiserfs_mark_dquot_dirty(struct dquot *);
791 static int reiserfs_write_info(struct super_block *, int);
792 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
793
794 static const struct dquot_operations reiserfs_quota_operations = {
795 .write_dquot = reiserfs_write_dquot,
796 .acquire_dquot = reiserfs_acquire_dquot,
797 .release_dquot = reiserfs_release_dquot,
798 .mark_dirty = reiserfs_mark_dquot_dirty,
799 .write_info = reiserfs_write_info,
800 .alloc_dquot = dquot_alloc,
801 .destroy_dquot = dquot_destroy,
802 };
803
804 static const struct quotactl_ops reiserfs_qctl_operations = {
805 .quota_on = reiserfs_quota_on,
806 .quota_off = dquot_quota_off,
807 .quota_sync = dquot_quota_sync,
808 .get_state = dquot_get_state,
809 .set_info = dquot_set_dqinfo,
810 .get_dqblk = dquot_get_dqblk,
811 .set_dqblk = dquot_set_dqblk,
812 };
813 #endif
814
815 static const struct export_operations reiserfs_export_ops = {
816 .encode_fh = reiserfs_encode_fh,
817 .fh_to_dentry = reiserfs_fh_to_dentry,
818 .fh_to_parent = reiserfs_fh_to_parent,
819 .get_parent = reiserfs_get_parent,
820 };
821
822 /*
823 * this struct is used in reiserfs_getopt () for containing the value for
824 * those mount options that have values rather than being toggles.
825 */
826 typedef struct {
827 char *value;
828 /*
829 * bitmask which is to set on mount_options bitmask
830 * when this value is found, 0 is no bits are to be changed.
831 */
832 int setmask;
833 /*
834 * bitmask which is to clear on mount_options bitmask
835 * when this value is found, 0 is no bits are to be changed.
836 * This is applied BEFORE setmask
837 */
838 int clrmask;
839 } arg_desc_t;
840
841 /* Set this bit in arg_required to allow empty arguments */
842 #define REISERFS_OPT_ALLOWEMPTY 31
843
844 /*
845 * this struct is used in reiserfs_getopt() for describing the
846 * set of reiserfs mount options
847 */
848 typedef struct {
849 char *option_name;
850
851 /* 0 if argument is not required, not 0 otherwise */
852 int arg_required;
853
854 /* list of values accepted by an option */
855 const arg_desc_t *values;
856
857 /*
858 * bitmask which is to set on mount_options bitmask
859 * when this value is found, 0 is no bits are to be changed.
860 */
861 int setmask;
862
863 /*
864 * bitmask which is to clear on mount_options bitmask
865 * when this value is found, 0 is no bits are to be changed.
866 * This is applied BEFORE setmask
867 */
868 int clrmask;
869 } opt_desc_t;
870
871 /* possible values for -o data= */
872 static const arg_desc_t logging_mode[] = {
873 {"ordered", 1 << REISERFS_DATA_ORDERED,
874 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
875 {"journal", 1 << REISERFS_DATA_LOG,
876 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
877 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
878 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
879 {.value = NULL}
880 };
881
882 /* possible values for -o barrier= */
883 static const arg_desc_t barrier_mode[] = {
884 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
885 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
886 {.value = NULL}
887 };
888
889 /*
890 * possible values for "-o block-allocator=" and bits which are to be set in
891 * s_mount_opt of reiserfs specific part of in-core super block
892 */
893 static const arg_desc_t balloc[] = {
894 {"noborder", 1 << REISERFS_NO_BORDER, 0},
895 {"border", 0, 1 << REISERFS_NO_BORDER},
896 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
897 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
898 {"test4", 1 << REISERFS_TEST4, 0},
899 {"notest4", 0, 1 << REISERFS_TEST4},
900 {NULL, 0, 0}
901 };
902
903 static const arg_desc_t tails[] = {
904 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
905 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
906 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
907 {NULL, 0, 0}
908 };
909
910 static const arg_desc_t error_actions[] = {
911 {"panic", 1 << REISERFS_ERROR_PANIC,
912 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
913 {"ro-remount", 1 << REISERFS_ERROR_RO,
914 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
915 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
916 {"continue", 1 << REISERFS_ERROR_CONTINUE,
917 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
918 #endif
919 {NULL, 0, 0},
920 };
921
922 /*
923 * proceed only one option from a list *cur - string containing of mount
924 * options
925 * opts - array of options which are accepted
926 * opt_arg - if option is found and requires an argument and if it is specifed
927 * in the input - pointer to the argument is stored here
928 * bit_flags - if option requires to set a certain bit - it is set here
929 * return -1 if unknown option is found, opt->arg_required otherwise
930 */
931 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
932 char **opt_arg, unsigned long *bit_flags)
933 {
934 char *p;
935 /*
936 * foo=bar,
937 * ^ ^ ^
938 * | | +-- option_end
939 * | +-- arg_start
940 * +-- option_start
941 */
942 const opt_desc_t *opt;
943 const arg_desc_t *arg;
944
945 p = *cur;
946
947 /* assume argument cannot contain commas */
948 *cur = strchr(p, ',');
949 if (*cur) {
950 *(*cur) = '\0';
951 (*cur)++;
952 }
953
954 if (!strncmp(p, "alloc=", 6)) {
955 /*
956 * Ugly special case, probably we should redo options
957 * parser so that it can understand several arguments for
958 * some options, also so that it can fill several bitfields
959 * with option values.
960 */
961 if (reiserfs_parse_alloc_options(s, p + 6)) {
962 return -1;
963 } else {
964 return 0;
965 }
966 }
967
968 /* for every option in the list */
969 for (opt = opts; opt->option_name; opt++) {
970 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
971 if (bit_flags) {
972 if (opt->clrmask ==
973 (1 << REISERFS_UNSUPPORTED_OPT))
974 reiserfs_warning(s, "super-6500",
975 "%s not supported.\n",
976 p);
977 else
978 *bit_flags &= ~opt->clrmask;
979 if (opt->setmask ==
980 (1 << REISERFS_UNSUPPORTED_OPT))
981 reiserfs_warning(s, "super-6501",
982 "%s not supported.\n",
983 p);
984 else
985 *bit_flags |= opt->setmask;
986 }
987 break;
988 }
989 }
990 if (!opt->option_name) {
991 reiserfs_warning(s, "super-6502",
992 "unknown mount option \"%s\"", p);
993 return -1;
994 }
995
996 p += strlen(opt->option_name);
997 switch (*p) {
998 case '=':
999 if (!opt->arg_required) {
1000 reiserfs_warning(s, "super-6503",
1001 "the option \"%s\" does not "
1002 "require an argument\n",
1003 opt->option_name);
1004 return -1;
1005 }
1006 break;
1007
1008 case 0:
1009 if (opt->arg_required) {
1010 reiserfs_warning(s, "super-6504",
1011 "the option \"%s\" requires an "
1012 "argument\n", opt->option_name);
1013 return -1;
1014 }
1015 break;
1016 default:
1017 reiserfs_warning(s, "super-6505",
1018 "head of option \"%s\" is only correct\n",
1019 opt->option_name);
1020 return -1;
1021 }
1022
1023 /*
1024 * move to the argument, or to next option if argument is not
1025 * required
1026 */
1027 p++;
1028
1029 if (opt->arg_required
1030 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1031 && !strlen(p)) {
1032 /* this catches "option=," if not allowed */
1033 reiserfs_warning(s, "super-6506",
1034 "empty argument for \"%s\"\n",
1035 opt->option_name);
1036 return -1;
1037 }
1038
1039 if (!opt->values) {
1040 /* *=NULLopt_arg contains pointer to argument */
1041 *opt_arg = p;
1042 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1043 }
1044
1045 /* values possible for this option are listed in opt->values */
1046 for (arg = opt->values; arg->value; arg++) {
1047 if (!strcmp(p, arg->value)) {
1048 if (bit_flags) {
1049 *bit_flags &= ~arg->clrmask;
1050 *bit_flags |= arg->setmask;
1051 }
1052 return opt->arg_required;
1053 }
1054 }
1055
1056 reiserfs_warning(s, "super-6506",
1057 "bad value \"%s\" for option \"%s\"\n", p,
1058 opt->option_name);
1059 return -1;
1060 }
1061
1062 /* returns 0 if something is wrong in option string, 1 - otherwise */
1063 static int reiserfs_parse_options(struct super_block *s,
1064
1065 /* string given via mount's -o */
1066 char *options,
1067
1068 /*
1069 * after the parsing phase, contains the
1070 * collection of bitflags defining what
1071 * mount options were selected.
1072 */
1073 unsigned long *mount_options,
1074
1075 /* strtol-ed from NNN of resize=NNN */
1076 unsigned long *blocks,
1077 char **jdev_name,
1078 unsigned int *commit_max_age,
1079 char **qf_names,
1080 unsigned int *qfmt)
1081 {
1082 int c;
1083 char *arg = NULL;
1084 char *pos;
1085 opt_desc_t opts[] = {
1086 /*
1087 * Compatibility stuff, so that -o notail for old
1088 * setups still work
1089 */
1090 {"tails",.arg_required = 't',.values = tails},
1091 {"notail",.clrmask =
1092 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1093 {"conv",.setmask = 1 << REISERFS_CONVERT},
1094 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1095 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1096 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1097 #ifdef CONFIG_REISERFS_FS_XATTR
1098 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1099 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1100 #else
1101 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1102 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1103 #endif
1104 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1105 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1106 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1107 #else
1108 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1109 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1110 #endif
1111 {.option_name = "nolog"},
1112 {"replayonly",.setmask = 1 << REPLAYONLY},
1113 {"block-allocator",.arg_required = 'a',.values = balloc},
1114 {"data",.arg_required = 'd',.values = logging_mode},
1115 {"barrier",.arg_required = 'b',.values = barrier_mode},
1116 {"resize",.arg_required = 'r',.values = NULL},
1117 {"jdev",.arg_required = 'j',.values = NULL},
1118 {"nolargeio",.arg_required = 'w',.values = NULL},
1119 {"commit",.arg_required = 'c',.values = NULL},
1120 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1121 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1122 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1123 {"errors",.arg_required = 'e',.values = error_actions},
1124 {"usrjquota",.arg_required =
1125 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1126 {"grpjquota",.arg_required =
1127 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1128 {"jqfmt",.arg_required = 'f',.values = NULL},
1129 {.option_name = NULL}
1130 };
1131
1132 *blocks = 0;
1133 if (!options || !*options)
1134 /*
1135 * use default configuration: create tails, journaling on, no
1136 * conversion to newest format
1137 */
1138 return 1;
1139
1140 for (pos = options; pos;) {
1141 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1142 if (c == -1)
1143 /* wrong option is given */
1144 return 0;
1145
1146 if (c == 'r') {
1147 char *p;
1148
1149 p = NULL;
1150 /* "resize=NNN" or "resize=auto" */
1151
1152 if (!strcmp(arg, "auto")) {
1153 /* From JFS code, to auto-get the size. */
1154 *blocks =
1155 s->s_bdev->bd_inode->i_size >> s->
1156 s_blocksize_bits;
1157 } else {
1158 *blocks = simple_strtoul(arg, &p, 0);
1159 if (*p != '\0') {
1160 /* NNN does not look like a number */
1161 reiserfs_warning(s, "super-6507",
1162 "bad value %s for "
1163 "-oresize\n", arg);
1164 return 0;
1165 }
1166 }
1167 }
1168
1169 if (c == 'c') {
1170 char *p = NULL;
1171 unsigned long val = simple_strtoul(arg, &p, 0);
1172 /* commit=NNN (time in seconds) */
1173 if (*p != '\0' || val >= (unsigned int)-1) {
1174 reiserfs_warning(s, "super-6508",
1175 "bad value %s for -ocommit\n",
1176 arg);
1177 return 0;
1178 }
1179 *commit_max_age = (unsigned int)val;
1180 }
1181
1182 if (c == 'w') {
1183 reiserfs_warning(s, "super-6509", "nolargeio option "
1184 "is no longer supported");
1185 return 0;
1186 }
1187
1188 if (c == 'j') {
1189 if (arg && *arg && jdev_name) {
1190 /* Hm, already assigned? */
1191 if (*jdev_name) {
1192 reiserfs_warning(s, "super-6510",
1193 "journal device was "
1194 "already specified to "
1195 "be %s", *jdev_name);
1196 return 0;
1197 }
1198 *jdev_name = arg;
1199 }
1200 }
1201 #ifdef CONFIG_QUOTA
1202 if (c == 'u' || c == 'g') {
1203 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1204
1205 if (sb_any_quota_loaded(s) &&
1206 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1207 reiserfs_warning(s, "super-6511",
1208 "cannot change journaled "
1209 "quota options when quota "
1210 "turned on.");
1211 return 0;
1212 }
1213 if (*arg) { /* Some filename specified? */
1214 if (REISERFS_SB(s)->s_qf_names[qtype]
1215 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1216 arg)) {
1217 reiserfs_warning(s, "super-6512",
1218 "%s quota file "
1219 "already specified.",
1220 QTYPE2NAME(qtype));
1221 return 0;
1222 }
1223 if (strchr(arg, '/')) {
1224 reiserfs_warning(s, "super-6513",
1225 "quotafile must be "
1226 "on filesystem root.");
1227 return 0;
1228 }
1229 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1230 if (!qf_names[qtype]) {
1231 reiserfs_warning(s, "reiserfs-2502",
1232 "not enough memory "
1233 "for storing "
1234 "quotafile name.");
1235 return 0;
1236 }
1237 if (qtype == USRQUOTA)
1238 *mount_options |= 1 << REISERFS_USRQUOTA;
1239 else
1240 *mount_options |= 1 << REISERFS_GRPQUOTA;
1241 } else {
1242 if (qf_names[qtype] !=
1243 REISERFS_SB(s)->s_qf_names[qtype])
1244 kfree(qf_names[qtype]);
1245 qf_names[qtype] = NULL;
1246 if (qtype == USRQUOTA)
1247 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1248 else
1249 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1250 }
1251 }
1252 if (c == 'f') {
1253 if (!strcmp(arg, "vfsold"))
1254 *qfmt = QFMT_VFS_OLD;
1255 else if (!strcmp(arg, "vfsv0"))
1256 *qfmt = QFMT_VFS_V0;
1257 else {
1258 reiserfs_warning(s, "super-6514",
1259 "unknown quota format "
1260 "specified.");
1261 return 0;
1262 }
1263 if (sb_any_quota_loaded(s) &&
1264 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1265 reiserfs_warning(s, "super-6515",
1266 "cannot change journaled "
1267 "quota options when quota "
1268 "turned on.");
1269 return 0;
1270 }
1271 }
1272 #else
1273 if (c == 'u' || c == 'g' || c == 'f') {
1274 reiserfs_warning(s, "reiserfs-2503", "journaled "
1275 "quota options not supported.");
1276 return 0;
1277 }
1278 #endif
1279 }
1280
1281 #ifdef CONFIG_QUOTA
1282 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1283 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1284 reiserfs_warning(s, "super-6515",
1285 "journaled quota format not specified.");
1286 return 0;
1287 }
1288 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1289 sb_has_quota_loaded(s, USRQUOTA)) ||
1290 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1291 sb_has_quota_loaded(s, GRPQUOTA))) {
1292 reiserfs_warning(s, "super-6516", "quota options must "
1293 "be present when quota is turned on.");
1294 return 0;
1295 }
1296 #endif
1297
1298 return 1;
1299 }
1300
1301 static void switch_data_mode(struct super_block *s, unsigned long mode)
1302 {
1303 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1304 (1 << REISERFS_DATA_ORDERED) |
1305 (1 << REISERFS_DATA_WRITEBACK));
1306 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1307 }
1308
1309 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1310 {
1311 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1312 if (!reiserfs_data_log(s)) {
1313 switch_data_mode(s, REISERFS_DATA_LOG);
1314 reiserfs_info(s, "switching to journaled data mode\n");
1315 }
1316 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1317 if (!reiserfs_data_ordered(s)) {
1318 switch_data_mode(s, REISERFS_DATA_ORDERED);
1319 reiserfs_info(s, "switching to ordered data mode\n");
1320 }
1321 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1322 if (!reiserfs_data_writeback(s)) {
1323 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1324 reiserfs_info(s, "switching to writeback data mode\n");
1325 }
1326 }
1327 }
1328
1329 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1330 {
1331 int flush = (1 << REISERFS_BARRIER_FLUSH);
1332 int none = (1 << REISERFS_BARRIER_NONE);
1333 int all_barrier = flush | none;
1334
1335 if (bits & all_barrier) {
1336 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1337 if (bits & flush) {
1338 REISERFS_SB(s)->s_mount_opt |= flush;
1339 printk("reiserfs: enabling write barrier flush mode\n");
1340 } else if (bits & none) {
1341 REISERFS_SB(s)->s_mount_opt |= none;
1342 printk("reiserfs: write barriers turned off\n");
1343 }
1344 }
1345 }
1346
1347 static void handle_attrs(struct super_block *s)
1348 {
1349 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1350
1351 if (reiserfs_attrs(s)) {
1352 if (old_format_only(s)) {
1353 reiserfs_warning(s, "super-6517", "cannot support "
1354 "attributes on 3.5.x disk format");
1355 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1356 return;
1357 }
1358 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1359 reiserfs_warning(s, "super-6518", "cannot support "
1360 "attributes until flag is set in "
1361 "super-block");
1362 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1363 }
1364 }
1365 }
1366
1367 #ifdef CONFIG_QUOTA
1368 static void handle_quota_files(struct super_block *s, char **qf_names,
1369 unsigned int *qfmt)
1370 {
1371 int i;
1372
1373 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1374 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1375 kfree(REISERFS_SB(s)->s_qf_names[i]);
1376 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1377 }
1378 if (*qfmt)
1379 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1380 }
1381 #endif
1382
1383 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1384 {
1385 struct reiserfs_super_block *rs;
1386 struct reiserfs_transaction_handle th;
1387 unsigned long blocks;
1388 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1389 unsigned long safe_mask = 0;
1390 unsigned int commit_max_age = (unsigned int)-1;
1391 struct reiserfs_journal *journal = SB_JOURNAL(s);
1392 char *new_opts = kstrdup(arg, GFP_KERNEL);
1393 int err;
1394 char *qf_names[REISERFS_MAXQUOTAS];
1395 unsigned int qfmt = 0;
1396 #ifdef CONFIG_QUOTA
1397 int i;
1398 #endif
1399
1400 sync_filesystem(s);
1401 reiserfs_write_lock(s);
1402
1403 #ifdef CONFIG_QUOTA
1404 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1405 #endif
1406
1407 rs = SB_DISK_SUPER_BLOCK(s);
1408
1409 if (!reiserfs_parse_options
1410 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1411 qf_names, &qfmt)) {
1412 #ifdef CONFIG_QUOTA
1413 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1414 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1415 kfree(qf_names[i]);
1416 #endif
1417 err = -EINVAL;
1418 goto out_err_unlock;
1419 }
1420 #ifdef CONFIG_QUOTA
1421 handle_quota_files(s, qf_names, &qfmt);
1422 #endif
1423
1424 handle_attrs(s);
1425
1426 /* Add options that are safe here */
1427 safe_mask |= 1 << REISERFS_SMALLTAIL;
1428 safe_mask |= 1 << REISERFS_LARGETAIL;
1429 safe_mask |= 1 << REISERFS_NO_BORDER;
1430 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1431 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1432 safe_mask |= 1 << REISERFS_TEST4;
1433 safe_mask |= 1 << REISERFS_ATTRS;
1434 safe_mask |= 1 << REISERFS_XATTRS_USER;
1435 safe_mask |= 1 << REISERFS_POSIXACL;
1436 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1437 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1438 safe_mask |= 1 << REISERFS_ERROR_RO;
1439 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1440 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1441 safe_mask |= 1 << REISERFS_USRQUOTA;
1442 safe_mask |= 1 << REISERFS_GRPQUOTA;
1443
1444 /*
1445 * Update the bitmask, taking care to keep
1446 * the bits we're not allowed to change here
1447 */
1448 REISERFS_SB(s)->s_mount_opt =
1449 (REISERFS_SB(s)->
1450 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1451
1452 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1453 journal->j_max_commit_age = commit_max_age;
1454 journal->j_max_trans_age = commit_max_age;
1455 } else if (commit_max_age == 0) {
1456 /* 0 means restore defaults. */
1457 journal->j_max_commit_age = journal->j_default_max_commit_age;
1458 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1459 }
1460
1461 if (blocks) {
1462 err = reiserfs_resize(s, blocks);
1463 if (err != 0)
1464 goto out_err_unlock;
1465 }
1466
1467 if (*mount_flags & MS_RDONLY) {
1468 reiserfs_write_unlock(s);
1469 reiserfs_xattr_init(s, *mount_flags);
1470 /* remount read-only */
1471 if (s->s_flags & MS_RDONLY)
1472 /* it is read-only already */
1473 goto out_ok_unlocked;
1474
1475 err = dquot_suspend(s, -1);
1476 if (err < 0)
1477 goto out_err;
1478
1479 /* try to remount file system with read-only permissions */
1480 if (sb_umount_state(rs) == REISERFS_VALID_FS
1481 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1482 goto out_ok_unlocked;
1483 }
1484
1485 reiserfs_write_lock(s);
1486
1487 err = journal_begin(&th, s, 10);
1488 if (err)
1489 goto out_err_unlock;
1490
1491 /* Mounting a rw partition read-only. */
1492 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1493 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1494 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1495 } else {
1496 /* remount read-write */
1497 if (!(s->s_flags & MS_RDONLY)) {
1498 reiserfs_write_unlock(s);
1499 reiserfs_xattr_init(s, *mount_flags);
1500 goto out_ok_unlocked; /* We are read-write already */
1501 }
1502
1503 if (reiserfs_is_journal_aborted(journal)) {
1504 err = journal->j_errno;
1505 goto out_err_unlock;
1506 }
1507
1508 handle_data_mode(s, mount_options);
1509 handle_barrier_mode(s, mount_options);
1510 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1511
1512 /* now it is safe to call journal_begin */
1513 s->s_flags &= ~MS_RDONLY;
1514 err = journal_begin(&th, s, 10);
1515 if (err)
1516 goto out_err_unlock;
1517
1518 /* Mount a partition which is read-only, read-write */
1519 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1520 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1521 s->s_flags &= ~MS_RDONLY;
1522 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1523 if (!old_format_only(s))
1524 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1525 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1526 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1527 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1528 }
1529 /* this will force a full flush of all journal lists */
1530 SB_JOURNAL(s)->j_must_wait = 1;
1531 err = journal_end(&th);
1532 if (err)
1533 goto out_err_unlock;
1534
1535 reiserfs_write_unlock(s);
1536 if (!(*mount_flags & MS_RDONLY)) {
1537 dquot_resume(s, -1);
1538 reiserfs_write_lock(s);
1539 finish_unfinished(s);
1540 reiserfs_write_unlock(s);
1541 reiserfs_xattr_init(s, *mount_flags);
1542 }
1543
1544 out_ok_unlocked:
1545 replace_mount_options(s, new_opts);
1546 return 0;
1547
1548 out_err_unlock:
1549 reiserfs_write_unlock(s);
1550 out_err:
1551 kfree(new_opts);
1552 return err;
1553 }
1554
1555 static int read_super_block(struct super_block *s, int offset)
1556 {
1557 struct buffer_head *bh;
1558 struct reiserfs_super_block *rs;
1559 int fs_blocksize;
1560
1561 bh = sb_bread(s, offset / s->s_blocksize);
1562 if (!bh) {
1563 reiserfs_warning(s, "sh-2006",
1564 "bread failed (dev %s, block %lu, size %lu)",
1565 s->s_id, offset / s->s_blocksize,
1566 s->s_blocksize);
1567 return 1;
1568 }
1569
1570 rs = (struct reiserfs_super_block *)bh->b_data;
1571 if (!is_any_reiserfs_magic_string(rs)) {
1572 brelse(bh);
1573 return 1;
1574 }
1575 /*
1576 * ok, reiserfs signature (old or new) found in at the given offset
1577 */
1578 fs_blocksize = sb_blocksize(rs);
1579 brelse(bh);
1580 sb_set_blocksize(s, fs_blocksize);
1581
1582 bh = sb_bread(s, offset / s->s_blocksize);
1583 if (!bh) {
1584 reiserfs_warning(s, "sh-2007",
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 (sb_blocksize(rs) != s->s_blocksize) {
1593 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1594 "filesystem on (dev %s, block %llu, size %lu)",
1595 s->s_id,
1596 (unsigned long long)bh->b_blocknr,
1597 s->s_blocksize);
1598 brelse(bh);
1599 return 1;
1600 }
1601
1602 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1603 brelse(bh);
1604 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1605 "--rebuild-tree run detected. Please run\n"
1606 "reiserfsck --rebuild-tree and wait for a "
1607 "completion. If that fails\n"
1608 "get newer reiserfsprogs package");
1609 return 1;
1610 }
1611
1612 SB_BUFFER_WITH_SB(s) = bh;
1613 SB_DISK_SUPER_BLOCK(s) = rs;
1614
1615 /*
1616 * magic is of non-standard journal filesystem, look at s_version to
1617 * find which format is in use
1618 */
1619 if (is_reiserfs_jr(rs)) {
1620 if (sb_version(rs) == REISERFS_VERSION_2)
1621 reiserfs_info(s, "found reiserfs format \"3.6\""
1622 " with non-standard journal\n");
1623 else if (sb_version(rs) == REISERFS_VERSION_1)
1624 reiserfs_info(s, "found reiserfs format \"3.5\""
1625 " with non-standard journal\n");
1626 else {
1627 reiserfs_warning(s, "sh-2012", "found unknown "
1628 "format \"%u\" of reiserfs with "
1629 "non-standard magic", sb_version(rs));
1630 return 1;
1631 }
1632 } else
1633 /*
1634 * s_version of standard format may contain incorrect
1635 * information, so we just look at the magic string
1636 */
1637 reiserfs_info(s,
1638 "found reiserfs format \"%s\" with standard journal\n",
1639 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1640
1641 s->s_op = &reiserfs_sops;
1642 s->s_export_op = &reiserfs_export_ops;
1643 #ifdef CONFIG_QUOTA
1644 s->s_qcop = &reiserfs_qctl_operations;
1645 s->dq_op = &reiserfs_quota_operations;
1646 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1647 #endif
1648
1649 /*
1650 * new format is limited by the 32 bit wide i_blocks field, want to
1651 * be one full block below that.
1652 */
1653 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1654 return 0;
1655 }
1656
1657 /* after journal replay, reread all bitmap and super blocks */
1658 static int reread_meta_blocks(struct super_block *s)
1659 {
1660 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1661 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1662 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1663 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1664 return 1;
1665 }
1666
1667 return 0;
1668 }
1669
1670 /* hash detection stuff */
1671
1672 /*
1673 * if root directory is empty - we set default - Yura's - hash and
1674 * warn about it
1675 * FIXME: we look for only one name in a directory. If tea and yura
1676 * both have the same value - we ask user to send report to the
1677 * mailing list
1678 */
1679 static __u32 find_hash_out(struct super_block *s)
1680 {
1681 int retval;
1682 struct inode *inode;
1683 struct cpu_key key;
1684 INITIALIZE_PATH(path);
1685 struct reiserfs_dir_entry de;
1686 struct reiserfs_de_head *deh;
1687 __u32 hash = DEFAULT_HASH;
1688 __u32 deh_hashval, teahash, r5hash, yurahash;
1689
1690 inode = d_inode(s->s_root);
1691
1692 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1693 retval = search_by_entry_key(s, &key, &path, &de);
1694 if (retval == IO_ERROR) {
1695 pathrelse(&path);
1696 return UNSET_HASH;
1697 }
1698 if (retval == NAME_NOT_FOUND)
1699 de.de_entry_num--;
1700
1701 set_de_name_and_namelen(&de);
1702 deh = de.de_deh + de.de_entry_num;
1703
1704 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1705 /* allow override in this case */
1706 if (reiserfs_rupasov_hash(s))
1707 hash = YURA_HASH;
1708 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1709 goto out;
1710 }
1711
1712 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1713 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1714 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1715 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1716
1717 if ((teahash == r5hash && deh_hashval == r5hash) ||
1718 (teahash == yurahash && deh_hashval == yurahash) ||
1719 (r5hash == yurahash && deh_hashval == yurahash)) {
1720 reiserfs_warning(s, "reiserfs-2506",
1721 "Unable to automatically detect hash "
1722 "function. Please mount with -o "
1723 "hash={tea,rupasov,r5}");
1724 hash = UNSET_HASH;
1725 goto out;
1726 }
1727
1728 if (deh_hashval == yurahash)
1729 hash = YURA_HASH;
1730 else if (deh_hashval == teahash)
1731 hash = TEA_HASH;
1732 else if (deh_hashval == r5hash)
1733 hash = R5_HASH;
1734 else {
1735 reiserfs_warning(s, "reiserfs-2506",
1736 "Unrecognised hash function");
1737 hash = UNSET_HASH;
1738 }
1739 out:
1740 pathrelse(&path);
1741 return hash;
1742 }
1743
1744 /* finds out which hash names are sorted with */
1745 static int what_hash(struct super_block *s)
1746 {
1747 __u32 code;
1748
1749 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1750
1751 /*
1752 * reiserfs_hash_detect() == true if any of the hash mount options
1753 * were used. We must check them to make sure the user isn't
1754 * using a bad hash value
1755 */
1756 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1757 code = find_hash_out(s);
1758
1759 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1760 /*
1761 * detection has found the hash, and we must check against the
1762 * mount options
1763 */
1764 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1765 reiserfs_warning(s, "reiserfs-2507",
1766 "Error, %s hash detected, "
1767 "unable to force rupasov hash",
1768 reiserfs_hashname(code));
1769 code = UNSET_HASH;
1770 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1771 reiserfs_warning(s, "reiserfs-2508",
1772 "Error, %s hash detected, "
1773 "unable to force tea hash",
1774 reiserfs_hashname(code));
1775 code = UNSET_HASH;
1776 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1777 reiserfs_warning(s, "reiserfs-2509",
1778 "Error, %s hash detected, "
1779 "unable to force r5 hash",
1780 reiserfs_hashname(code));
1781 code = UNSET_HASH;
1782 }
1783 } else {
1784 /*
1785 * find_hash_out was not called or
1786 * could not determine the hash
1787 */
1788 if (reiserfs_rupasov_hash(s)) {
1789 code = YURA_HASH;
1790 } else if (reiserfs_tea_hash(s)) {
1791 code = TEA_HASH;
1792 } else if (reiserfs_r5_hash(s)) {
1793 code = R5_HASH;
1794 }
1795 }
1796
1797 /*
1798 * if we are mounted RW, and we have a new valid hash code, update
1799 * the super
1800 */
1801 if (code != UNSET_HASH &&
1802 !(s->s_flags & MS_RDONLY) &&
1803 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1804 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1805 }
1806 return code;
1807 }
1808
1809 /* return pointer to appropriate function */
1810 static hashf_t hash_function(struct super_block *s)
1811 {
1812 switch (what_hash(s)) {
1813 case TEA_HASH:
1814 reiserfs_info(s, "Using tea hash to sort names\n");
1815 return keyed_hash;
1816 case YURA_HASH:
1817 reiserfs_info(s, "Using rupasov hash to sort names\n");
1818 return yura_hash;
1819 case R5_HASH:
1820 reiserfs_info(s, "Using r5 hash to sort names\n");
1821 return r5_hash;
1822 }
1823 return NULL;
1824 }
1825
1826 /* this is used to set up correct value for old partitions */
1827 static int function2code(hashf_t func)
1828 {
1829 if (func == keyed_hash)
1830 return TEA_HASH;
1831 if (func == yura_hash)
1832 return YURA_HASH;
1833 if (func == r5_hash)
1834 return R5_HASH;
1835
1836 BUG(); /* should never happen */
1837
1838 return 0;
1839 }
1840
1841 #define SWARN(silent, s, id, ...) \
1842 if (!(silent)) \
1843 reiserfs_warning(s, id, __VA_ARGS__)
1844
1845 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1846 {
1847 struct inode *root_inode;
1848 struct reiserfs_transaction_handle th;
1849 int old_format = 0;
1850 unsigned long blocks;
1851 unsigned int commit_max_age = 0;
1852 int jinit_done = 0;
1853 struct reiserfs_iget_args args;
1854 struct reiserfs_super_block *rs;
1855 char *jdev_name;
1856 struct reiserfs_sb_info *sbi;
1857 int errval = -EINVAL;
1858 char *qf_names[REISERFS_MAXQUOTAS] = {};
1859 unsigned int qfmt = 0;
1860
1861 save_mount_options(s, data);
1862
1863 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1864 if (!sbi)
1865 return -ENOMEM;
1866 s->s_fs_info = sbi;
1867 /* Set default values for options: non-aggressive tails, RO on errors */
1868 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1869 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1870 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1871 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1872 sbi->s_alloc_options.preallocmin = 0;
1873 /* Preallocate by 16 blocks (17-1) at once */
1874 sbi->s_alloc_options.preallocsize = 17;
1875 /* setup default block allocator options */
1876 reiserfs_init_alloc_options(s);
1877
1878 spin_lock_init(&sbi->old_work_lock);
1879 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1880 mutex_init(&sbi->lock);
1881 sbi->lock_depth = -1;
1882
1883 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1884 s->s_id);
1885 if (!sbi->commit_wq) {
1886 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1887 errval = -ENOMEM;
1888 goto error_unlocked;
1889 }
1890
1891 jdev_name = NULL;
1892 if (reiserfs_parse_options
1893 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1894 &commit_max_age, qf_names, &qfmt) == 0) {
1895 goto error_unlocked;
1896 }
1897 if (jdev_name && jdev_name[0]) {
1898 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1899 if (!sbi->s_jdev) {
1900 SWARN(silent, s, "", "Cannot allocate memory for "
1901 "journal device name");
1902 goto error;
1903 }
1904 }
1905 #ifdef CONFIG_QUOTA
1906 handle_quota_files(s, qf_names, &qfmt);
1907 #endif
1908
1909 if (blocks) {
1910 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1911 goto error_unlocked;
1912 }
1913
1914 /*
1915 * try old format (undistributed bitmap, super block in 8-th 1k
1916 * block of a device)
1917 */
1918 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1919 old_format = 1;
1920
1921 /*
1922 * try new format (64-th 1k block), which can contain reiserfs
1923 * super block
1924 */
1925 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1926 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1927 s->s_id);
1928 goto error_unlocked;
1929 }
1930
1931 rs = SB_DISK_SUPER_BLOCK(s);
1932 /*
1933 * Let's do basic sanity check to verify that underlying device is not
1934 * smaller than the filesystem. If the check fails then abort and
1935 * scream, because bad stuff will happen otherwise.
1936 */
1937 if (s->s_bdev && s->s_bdev->bd_inode
1938 && i_size_read(s->s_bdev->bd_inode) <
1939 sb_block_count(rs) * sb_blocksize(rs)) {
1940 SWARN(silent, s, "", "Filesystem cannot be "
1941 "mounted because it is bigger than the device");
1942 SWARN(silent, s, "", "You may need to run fsck "
1943 "or increase size of your LVM partition");
1944 SWARN(silent, s, "", "Or may be you forgot to "
1945 "reboot after fdisk when it told you to");
1946 goto error_unlocked;
1947 }
1948
1949 sbi->s_mount_state = SB_REISERFS_STATE(s);
1950 sbi->s_mount_state = REISERFS_VALID_FS;
1951
1952 if ((errval = reiserfs_init_bitmap_cache(s))) {
1953 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1954 goto error_unlocked;
1955 }
1956
1957 errval = -EINVAL;
1958 #ifdef CONFIG_REISERFS_CHECK
1959 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1960 SWARN(silent, s, "", "- it is slow mode for debugging.");
1961 #endif
1962
1963 /* make data=ordered the default */
1964 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1965 !reiserfs_data_writeback(s)) {
1966 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1967 }
1968
1969 if (reiserfs_data_log(s)) {
1970 reiserfs_info(s, "using journaled data mode\n");
1971 } else if (reiserfs_data_ordered(s)) {
1972 reiserfs_info(s, "using ordered data mode\n");
1973 } else {
1974 reiserfs_info(s, "using writeback data mode\n");
1975 }
1976 if (reiserfs_barrier_flush(s)) {
1977 printk("reiserfs: using flush barriers\n");
1978 }
1979
1980 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1981 SWARN(silent, s, "sh-2022",
1982 "unable to initialize journal space");
1983 goto error_unlocked;
1984 } else {
1985 /*
1986 * once this is set, journal_release must be called
1987 * if we error out of the mount
1988 */
1989 jinit_done = 1;
1990 }
1991
1992 if (reread_meta_blocks(s)) {
1993 SWARN(silent, s, "jmacd-9",
1994 "unable to reread meta blocks after journal init");
1995 goto error_unlocked;
1996 }
1997
1998 if (replay_only(s))
1999 goto error_unlocked;
2000
2001 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2002 SWARN(silent, s, "clm-7000",
2003 "Detected readonly device, marking FS readonly");
2004 s->s_flags |= MS_RDONLY;
2005 }
2006 args.objectid = REISERFS_ROOT_OBJECTID;
2007 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2008 root_inode =
2009 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2010 reiserfs_init_locked_inode, (void *)&args);
2011 if (!root_inode) {
2012 SWARN(silent, s, "jmacd-10", "get root inode failed");
2013 goto error_unlocked;
2014 }
2015
2016 /*
2017 * This path assumed to be called with the BKL in the old times.
2018 * Now we have inherited the big reiserfs lock from it and many
2019 * reiserfs helpers called in the mount path and elsewhere require
2020 * this lock to be held even if it's not always necessary. Let's be
2021 * conservative and hold it early. The window can be reduced after
2022 * careful review of the code.
2023 */
2024 reiserfs_write_lock(s);
2025
2026 if (root_inode->i_state & I_NEW) {
2027 reiserfs_read_locked_inode(root_inode, &args);
2028 unlock_new_inode(root_inode);
2029 }
2030
2031 s->s_root = d_make_root(root_inode);
2032 if (!s->s_root)
2033 goto error;
2034 /* define and initialize hash function */
2035 sbi->s_hash_function = hash_function(s);
2036 if (sbi->s_hash_function == NULL) {
2037 dput(s->s_root);
2038 s->s_root = NULL;
2039 goto error;
2040 }
2041
2042 if (is_reiserfs_3_5(rs)
2043 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2044 set_bit(REISERFS_3_5, &sbi->s_properties);
2045 else if (old_format)
2046 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2047 else
2048 set_bit(REISERFS_3_6, &sbi->s_properties);
2049
2050 if (!(s->s_flags & MS_RDONLY)) {
2051
2052 errval = journal_begin(&th, s, 1);
2053 if (errval) {
2054 dput(s->s_root);
2055 s->s_root = NULL;
2056 goto error;
2057 }
2058 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2059
2060 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2061 set_sb_fs_state(rs, 0);
2062
2063 /*
2064 * Clear out s_bmap_nr if it would wrap. We can handle this
2065 * case, but older revisions can't. This will cause the
2066 * file system to fail mount on those older implementations,
2067 * avoiding corruption. -jeffm
2068 */
2069 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2070 sb_bmap_nr(rs) != 0) {
2071 reiserfs_warning(s, "super-2030", "This file system "
2072 "claims to use %u bitmap blocks in "
2073 "its super block, but requires %u. "
2074 "Clearing to zero.", sb_bmap_nr(rs),
2075 reiserfs_bmap_count(s));
2076
2077 set_sb_bmap_nr(rs, 0);
2078 }
2079
2080 if (old_format_only(s)) {
2081 /*
2082 * filesystem of format 3.5 either with standard
2083 * or non-standard journal
2084 */
2085 if (convert_reiserfs(s)) {
2086 /* and -o conv is given */
2087 if (!silent)
2088 reiserfs_info(s,
2089 "converting 3.5 filesystem to the 3.6 format");
2090
2091 if (is_reiserfs_3_5(rs))
2092 /*
2093 * put magic string of 3.6 format.
2094 * 2.2 will not be able to
2095 * mount this filesystem anymore
2096 */
2097 memcpy(rs->s_v1.s_magic,
2098 reiserfs_3_6_magic_string,
2099 sizeof
2100 (reiserfs_3_6_magic_string));
2101
2102 set_sb_version(rs, REISERFS_VERSION_2);
2103 reiserfs_convert_objectid_map_v1(s);
2104 set_bit(REISERFS_3_6, &sbi->s_properties);
2105 clear_bit(REISERFS_3_5, &sbi->s_properties);
2106 } else if (!silent) {
2107 reiserfs_info(s, "using 3.5.x disk format\n");
2108 }
2109 } else
2110 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2111
2112
2113 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2114 errval = journal_end(&th);
2115 if (errval) {
2116 dput(s->s_root);
2117 s->s_root = NULL;
2118 goto error;
2119 }
2120
2121 reiserfs_write_unlock(s);
2122 if ((errval = reiserfs_lookup_privroot(s)) ||
2123 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2124 dput(s->s_root);
2125 s->s_root = NULL;
2126 goto error_unlocked;
2127 }
2128 reiserfs_write_lock(s);
2129
2130 /*
2131 * look for files which were to be removed in previous session
2132 */
2133 finish_unfinished(s);
2134 } else {
2135 if (old_format_only(s) && !silent) {
2136 reiserfs_info(s, "using 3.5.x disk format\n");
2137 }
2138
2139 reiserfs_write_unlock(s);
2140 if ((errval = reiserfs_lookup_privroot(s)) ||
2141 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2142 dput(s->s_root);
2143 s->s_root = NULL;
2144 goto error_unlocked;
2145 }
2146 reiserfs_write_lock(s);
2147 }
2148 /*
2149 * mark hash in super block: it could be unset. overwrite should be ok
2150 */
2151 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2152
2153 handle_attrs(s);
2154
2155 reiserfs_proc_info_init(s);
2156
2157 init_waitqueue_head(&(sbi->s_wait));
2158 spin_lock_init(&sbi->bitmap_lock);
2159
2160 reiserfs_write_unlock(s);
2161
2162 return (0);
2163
2164 error:
2165 reiserfs_write_unlock(s);
2166
2167 error_unlocked:
2168 /* kill the commit thread, free journal ram */
2169 if (jinit_done) {
2170 reiserfs_write_lock(s);
2171 journal_release_error(NULL, s);
2172 reiserfs_write_unlock(s);
2173 }
2174
2175 if (sbi->commit_wq)
2176 destroy_workqueue(sbi->commit_wq);
2177
2178 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2179
2180 reiserfs_free_bitmap_cache(s);
2181 if (SB_BUFFER_WITH_SB(s))
2182 brelse(SB_BUFFER_WITH_SB(s));
2183 #ifdef CONFIG_QUOTA
2184 {
2185 int j;
2186 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2187 kfree(qf_names[j]);
2188 }
2189 #endif
2190 kfree(sbi);
2191
2192 s->s_fs_info = NULL;
2193 return errval;
2194 }
2195
2196 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2197 {
2198 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2199
2200 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2201 buf->f_bfree = sb_free_blocks(rs);
2202 buf->f_bavail = buf->f_bfree;
2203 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2204 buf->f_bsize = dentry->d_sb->s_blocksize;
2205 /* changed to accommodate gcc folks. */
2206 buf->f_type = REISERFS_SUPER_MAGIC;
2207 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2208 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2209 sizeof(rs->s_uuid)/2);
2210
2211 return 0;
2212 }
2213
2214 #ifdef CONFIG_QUOTA
2215 static int reiserfs_write_dquot(struct dquot *dquot)
2216 {
2217 struct reiserfs_transaction_handle th;
2218 int ret, err;
2219 int depth;
2220
2221 reiserfs_write_lock(dquot->dq_sb);
2222 ret =
2223 journal_begin(&th, dquot->dq_sb,
2224 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2225 if (ret)
2226 goto out;
2227 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2228 ret = dquot_commit(dquot);
2229 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2230 err = journal_end(&th);
2231 if (!ret && err)
2232 ret = err;
2233 out:
2234 reiserfs_write_unlock(dquot->dq_sb);
2235 return ret;
2236 }
2237
2238 static int reiserfs_acquire_dquot(struct dquot *dquot)
2239 {
2240 struct reiserfs_transaction_handle th;
2241 int ret, err;
2242 int depth;
2243
2244 reiserfs_write_lock(dquot->dq_sb);
2245 ret =
2246 journal_begin(&th, dquot->dq_sb,
2247 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2248 if (ret)
2249 goto out;
2250 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2251 ret = dquot_acquire(dquot);
2252 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2253 err = journal_end(&th);
2254 if (!ret && err)
2255 ret = err;
2256 out:
2257 reiserfs_write_unlock(dquot->dq_sb);
2258 return ret;
2259 }
2260
2261 static int reiserfs_release_dquot(struct dquot *dquot)
2262 {
2263 struct reiserfs_transaction_handle th;
2264 int ret, err;
2265
2266 reiserfs_write_lock(dquot->dq_sb);
2267 ret =
2268 journal_begin(&th, dquot->dq_sb,
2269 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2270 reiserfs_write_unlock(dquot->dq_sb);
2271 if (ret) {
2272 /* Release dquot anyway to avoid endless cycle in dqput() */
2273 dquot_release(dquot);
2274 goto out;
2275 }
2276 ret = dquot_release(dquot);
2277 reiserfs_write_lock(dquot->dq_sb);
2278 err = journal_end(&th);
2279 if (!ret && err)
2280 ret = err;
2281 reiserfs_write_unlock(dquot->dq_sb);
2282 out:
2283 return ret;
2284 }
2285
2286 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2287 {
2288 /* Are we journaling quotas? */
2289 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2290 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2291 dquot_mark_dquot_dirty(dquot);
2292 return reiserfs_write_dquot(dquot);
2293 } else
2294 return dquot_mark_dquot_dirty(dquot);
2295 }
2296
2297 static int reiserfs_write_info(struct super_block *sb, int type)
2298 {
2299 struct reiserfs_transaction_handle th;
2300 int ret, err;
2301 int depth;
2302
2303 /* Data block + inode block */
2304 reiserfs_write_lock(sb);
2305 ret = journal_begin(&th, sb, 2);
2306 if (ret)
2307 goto out;
2308 depth = reiserfs_write_unlock_nested(sb);
2309 ret = dquot_commit_info(sb, type);
2310 reiserfs_write_lock_nested(sb, depth);
2311 err = journal_end(&th);
2312 if (!ret && err)
2313 ret = err;
2314 out:
2315 reiserfs_write_unlock(sb);
2316 return ret;
2317 }
2318
2319 /*
2320 * Turn on quotas during mount time - we need to find the quota file and such...
2321 */
2322 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2323 {
2324 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2325 REISERFS_SB(sb)->s_jquota_fmt, type);
2326 }
2327
2328 /*
2329 * Standard function to be called on quota_on
2330 */
2331 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2332 struct path *path)
2333 {
2334 int err;
2335 struct inode *inode;
2336 struct reiserfs_transaction_handle th;
2337 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2338
2339 reiserfs_write_lock(sb);
2340 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2341 err = -EINVAL;
2342 goto out;
2343 }
2344
2345 /* Quotafile not on the same filesystem? */
2346 if (path->dentry->d_sb != sb) {
2347 err = -EXDEV;
2348 goto out;
2349 }
2350 inode = d_inode(path->dentry);
2351 /*
2352 * We must not pack tails for quota files on reiserfs for quota
2353 * IO to work
2354 */
2355 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2356 err = reiserfs_unpack(inode, NULL);
2357 if (err) {
2358 reiserfs_warning(sb, "super-6520",
2359 "Unpacking tail of quota file failed"
2360 " (%d). Cannot turn on quotas.", err);
2361 err = -EINVAL;
2362 goto out;
2363 }
2364 mark_inode_dirty(inode);
2365 }
2366 /* Journaling quota? */
2367 if (REISERFS_SB(sb)->s_qf_names[type]) {
2368 /* Quotafile not of fs root? */
2369 if (path->dentry->d_parent != sb->s_root)
2370 reiserfs_warning(sb, "super-6521",
2371 "Quota file not on filesystem root. "
2372 "Journalled quota will not work.");
2373 }
2374
2375 /*
2376 * When we journal data on quota file, we have to flush journal to see
2377 * all updates to the file when we bypass pagecache...
2378 */
2379 if (reiserfs_file_data_log(inode)) {
2380 /* Just start temporary transaction and finish it */
2381 err = journal_begin(&th, sb, 1);
2382 if (err)
2383 goto out;
2384 err = journal_end_sync(&th);
2385 if (err)
2386 goto out;
2387 }
2388 reiserfs_write_unlock(sb);
2389 return dquot_quota_on(sb, type, format_id, path);
2390 out:
2391 reiserfs_write_unlock(sb);
2392 return err;
2393 }
2394
2395 /*
2396 * Read data from quotafile - avoid pagecache and such because we cannot afford
2397 * acquiring the locks... As quota files are never truncated and quota code
2398 * itself serializes the operations (and no one else should touch the files)
2399 * we don't have to be afraid of races
2400 */
2401 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2402 size_t len, loff_t off)
2403 {
2404 struct inode *inode = sb_dqopt(sb)->files[type];
2405 unsigned long blk = off >> sb->s_blocksize_bits;
2406 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2407 size_t toread;
2408 struct buffer_head tmp_bh, *bh;
2409 loff_t i_size = i_size_read(inode);
2410
2411 if (off > i_size)
2412 return 0;
2413 if (off + len > i_size)
2414 len = i_size - off;
2415 toread = len;
2416 while (toread > 0) {
2417 tocopy =
2418 sb->s_blocksize - offset <
2419 toread ? sb->s_blocksize - offset : toread;
2420 tmp_bh.b_state = 0;
2421 /*
2422 * Quota files are without tails so we can safely
2423 * use this function
2424 */
2425 reiserfs_write_lock(sb);
2426 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2427 reiserfs_write_unlock(sb);
2428 if (err)
2429 return err;
2430 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2431 memset(data, 0, tocopy);
2432 else {
2433 bh = sb_bread(sb, tmp_bh.b_blocknr);
2434 if (!bh)
2435 return -EIO;
2436 memcpy(data, bh->b_data + offset, tocopy);
2437 brelse(bh);
2438 }
2439 offset = 0;
2440 toread -= tocopy;
2441 data += tocopy;
2442 blk++;
2443 }
2444 return len;
2445 }
2446
2447 /*
2448 * Write to quotafile (we know the transaction is already started and has
2449 * enough credits)
2450 */
2451 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2452 const char *data, size_t len, loff_t off)
2453 {
2454 struct inode *inode = sb_dqopt(sb)->files[type];
2455 unsigned long blk = off >> sb->s_blocksize_bits;
2456 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2457 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2458 size_t towrite = len;
2459 struct buffer_head tmp_bh, *bh;
2460
2461 if (!current->journal_info) {
2462 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2463 (unsigned long long)off, (unsigned long long)len);
2464 return -EIO;
2465 }
2466 while (towrite > 0) {
2467 tocopy = sb->s_blocksize - offset < towrite ?
2468 sb->s_blocksize - offset : towrite;
2469 tmp_bh.b_state = 0;
2470 reiserfs_write_lock(sb);
2471 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2472 reiserfs_write_unlock(sb);
2473 if (err)
2474 goto out;
2475 if (offset || tocopy != sb->s_blocksize)
2476 bh = sb_bread(sb, tmp_bh.b_blocknr);
2477 else
2478 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2479 if (!bh) {
2480 err = -EIO;
2481 goto out;
2482 }
2483 lock_buffer(bh);
2484 memcpy(bh->b_data + offset, data, tocopy);
2485 flush_dcache_page(bh->b_page);
2486 set_buffer_uptodate(bh);
2487 unlock_buffer(bh);
2488 reiserfs_write_lock(sb);
2489 reiserfs_prepare_for_journal(sb, bh, 1);
2490 journal_mark_dirty(current->journal_info, bh);
2491 if (!journal_quota)
2492 reiserfs_add_ordered_list(inode, bh);
2493 reiserfs_write_unlock(sb);
2494 brelse(bh);
2495 offset = 0;
2496 towrite -= tocopy;
2497 data += tocopy;
2498 blk++;
2499 }
2500 out:
2501 if (len == towrite)
2502 return err;
2503 if (inode->i_size < off + len - towrite)
2504 i_size_write(inode, off + len - towrite);
2505 inode->i_version++;
2506 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2507 mark_inode_dirty(inode);
2508 return len - towrite;
2509 }
2510
2511 #endif
2512
2513 static struct dentry *get_super_block(struct file_system_type *fs_type,
2514 int flags, const char *dev_name,
2515 void *data)
2516 {
2517 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2518 }
2519
2520 static int __init init_reiserfs_fs(void)
2521 {
2522 int ret;
2523
2524 ret = init_inodecache();
2525 if (ret)
2526 return ret;
2527
2528 reiserfs_proc_info_global_init();
2529
2530 ret = register_filesystem(&reiserfs_fs_type);
2531 if (ret)
2532 goto out;
2533
2534 return 0;
2535 out:
2536 reiserfs_proc_info_global_done();
2537 destroy_inodecache();
2538
2539 return ret;
2540 }
2541
2542 static void __exit exit_reiserfs_fs(void)
2543 {
2544 reiserfs_proc_info_global_done();
2545 unregister_filesystem(&reiserfs_fs_type);
2546 destroy_inodecache();
2547 }
2548
2549 struct file_system_type reiserfs_fs_type = {
2550 .owner = THIS_MODULE,
2551 .name = "reiserfs",
2552 .mount = get_super_block,
2553 .kill_sb = reiserfs_kill_sb,
2554 .fs_flags = FS_REQUIRES_DEV,
2555 };
2556 MODULE_ALIAS_FS("reiserfs");
2557
2558 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2559 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2560 MODULE_LICENSE("GPL");
2561
2562 module_init(init_reiserfs_fs);
2563 module_exit(exit_reiserfs_fs);
Linux with added FPC-III support