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Merge remote-tracking branches 'asoc/topic/davinci', 'asoc/topic/fsl-card' and 'asoc...
[deliverable/linux.git] / fs / reiserfs / super.c
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 (IS_ERR_OR_NULL(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 SLAB_ACCOUNT),
631 init_once);
632 if (reiserfs_inode_cachep == NULL)
633 return -ENOMEM;
634 return 0;
635 }
636
637 static void destroy_inodecache(void)
638 {
639 /*
640 * Make sure all delayed rcu free inodes are flushed before we
641 * destroy cache.
642 */
643 rcu_barrier();
644 kmem_cache_destroy(reiserfs_inode_cachep);
645 }
646
647 /* we don't mark inodes dirty, we just log them */
648 static void reiserfs_dirty_inode(struct inode *inode, int flags)
649 {
650 struct reiserfs_transaction_handle th;
651
652 int err = 0;
653
654 if (inode->i_sb->s_flags & MS_RDONLY) {
655 reiserfs_warning(inode->i_sb, "clm-6006",
656 "writing inode %lu on readonly FS",
657 inode->i_ino);
658 return;
659 }
660 reiserfs_write_lock(inode->i_sb);
661
662 /*
663 * this is really only used for atime updates, so they don't have
664 * to be included in O_SYNC or fsync
665 */
666 err = journal_begin(&th, inode->i_sb, 1);
667 if (err)
668 goto out;
669
670 reiserfs_update_sd(&th, inode);
671 journal_end(&th);
672
673 out:
674 reiserfs_write_unlock(inode->i_sb);
675 }
676
677 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
678 {
679 struct super_block *s = root->d_sb;
680 struct reiserfs_journal *journal = SB_JOURNAL(s);
681 long opts = REISERFS_SB(s)->s_mount_opt;
682
683 if (opts & (1 << REISERFS_LARGETAIL))
684 seq_puts(seq, ",tails=on");
685 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
686 seq_puts(seq, ",notail");
687 /* tails=small is default so we don't show it */
688
689 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
690 seq_puts(seq, ",barrier=none");
691 /* barrier=flush is default so we don't show it */
692
693 if (opts & (1 << REISERFS_ERROR_CONTINUE))
694 seq_puts(seq, ",errors=continue");
695 else if (opts & (1 << REISERFS_ERROR_PANIC))
696 seq_puts(seq, ",errors=panic");
697 /* errors=ro is default so we don't show it */
698
699 if (opts & (1 << REISERFS_DATA_LOG))
700 seq_puts(seq, ",data=journal");
701 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
702 seq_puts(seq, ",data=writeback");
703 /* data=ordered is default so we don't show it */
704
705 if (opts & (1 << REISERFS_ATTRS))
706 seq_puts(seq, ",attrs");
707
708 if (opts & (1 << REISERFS_XATTRS_USER))
709 seq_puts(seq, ",user_xattr");
710
711 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
712 seq_puts(seq, ",expose_privroot");
713
714 if (opts & (1 << REISERFS_POSIXACL))
715 seq_puts(seq, ",acl");
716
717 if (REISERFS_SB(s)->s_jdev)
718 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
719
720 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
721 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
722
723 #ifdef CONFIG_QUOTA
724 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
725 seq_show_option(seq, "usrjquota",
726 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
727 else if (opts & (1 << REISERFS_USRQUOTA))
728 seq_puts(seq, ",usrquota");
729 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
730 seq_show_option(seq, "grpjquota",
731 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
732 else if (opts & (1 << REISERFS_GRPQUOTA))
733 seq_puts(seq, ",grpquota");
734 if (REISERFS_SB(s)->s_jquota_fmt) {
735 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
736 seq_puts(seq, ",jqfmt=vfsold");
737 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
738 seq_puts(seq, ",jqfmt=vfsv0");
739 }
740 #endif
741
742 /* Block allocator options */
743 if (opts & (1 << REISERFS_NO_BORDER))
744 seq_puts(seq, ",block-allocator=noborder");
745 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
746 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
747 if (opts & (1 << REISERFS_HASHED_RELOCATION))
748 seq_puts(seq, ",block-allocator=hashed_relocation");
749 if (opts & (1 << REISERFS_TEST4))
750 seq_puts(seq, ",block-allocator=test4");
751 show_alloc_options(seq, s);
752 return 0;
753 }
754
755 #ifdef CONFIG_QUOTA
756 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
757 size_t, loff_t);
758 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
759 loff_t);
760
761 static struct dquot **reiserfs_get_dquots(struct inode *inode)
762 {
763 return REISERFS_I(inode)->i_dquot;
764 }
765 #endif
766
767 static const struct super_operations reiserfs_sops = {
768 .alloc_inode = reiserfs_alloc_inode,
769 .destroy_inode = reiserfs_destroy_inode,
770 .write_inode = reiserfs_write_inode,
771 .dirty_inode = reiserfs_dirty_inode,
772 .evict_inode = reiserfs_evict_inode,
773 .put_super = reiserfs_put_super,
774 .sync_fs = reiserfs_sync_fs,
775 .freeze_fs = reiserfs_freeze,
776 .unfreeze_fs = reiserfs_unfreeze,
777 .statfs = reiserfs_statfs,
778 .remount_fs = reiserfs_remount,
779 .show_options = reiserfs_show_options,
780 #ifdef CONFIG_QUOTA
781 .quota_read = reiserfs_quota_read,
782 .quota_write = reiserfs_quota_write,
783 .get_dquots = reiserfs_get_dquots,
784 #endif
785 };
786
787 #ifdef CONFIG_QUOTA
788 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
789
790 static int reiserfs_write_dquot(struct dquot *);
791 static int reiserfs_acquire_dquot(struct dquot *);
792 static int reiserfs_release_dquot(struct dquot *);
793 static int reiserfs_mark_dquot_dirty(struct dquot *);
794 static int reiserfs_write_info(struct super_block *, int);
795 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
796
797 static const struct dquot_operations reiserfs_quota_operations = {
798 .write_dquot = reiserfs_write_dquot,
799 .acquire_dquot = reiserfs_acquire_dquot,
800 .release_dquot = reiserfs_release_dquot,
801 .mark_dirty = reiserfs_mark_dquot_dirty,
802 .write_info = reiserfs_write_info,
803 .alloc_dquot = dquot_alloc,
804 .destroy_dquot = dquot_destroy,
805 };
806
807 static const struct quotactl_ops reiserfs_qctl_operations = {
808 .quota_on = reiserfs_quota_on,
809 .quota_off = dquot_quota_off,
810 .quota_sync = dquot_quota_sync,
811 .get_state = dquot_get_state,
812 .set_info = dquot_set_dqinfo,
813 .get_dqblk = dquot_get_dqblk,
814 .set_dqblk = dquot_set_dqblk,
815 };
816 #endif
817
818 static const struct export_operations reiserfs_export_ops = {
819 .encode_fh = reiserfs_encode_fh,
820 .fh_to_dentry = reiserfs_fh_to_dentry,
821 .fh_to_parent = reiserfs_fh_to_parent,
822 .get_parent = reiserfs_get_parent,
823 };
824
825 /*
826 * this struct is used in reiserfs_getopt () for containing the value for
827 * those mount options that have values rather than being toggles.
828 */
829 typedef struct {
830 char *value;
831 /*
832 * bitmask which is to set on mount_options bitmask
833 * when this value is found, 0 is no bits are to be changed.
834 */
835 int setmask;
836 /*
837 * bitmask which is to clear on mount_options bitmask
838 * when this value is found, 0 is no bits are to be changed.
839 * This is applied BEFORE setmask
840 */
841 int clrmask;
842 } arg_desc_t;
843
844 /* Set this bit in arg_required to allow empty arguments */
845 #define REISERFS_OPT_ALLOWEMPTY 31
846
847 /*
848 * this struct is used in reiserfs_getopt() for describing the
849 * set of reiserfs mount options
850 */
851 typedef struct {
852 char *option_name;
853
854 /* 0 if argument is not required, not 0 otherwise */
855 int arg_required;
856
857 /* list of values accepted by an option */
858 const arg_desc_t *values;
859
860 /*
861 * bitmask which is to set on mount_options bitmask
862 * when this value is found, 0 is no bits are to be changed.
863 */
864 int setmask;
865
866 /*
867 * bitmask which is to clear on mount_options bitmask
868 * when this value is found, 0 is no bits are to be changed.
869 * This is applied BEFORE setmask
870 */
871 int clrmask;
872 } opt_desc_t;
873
874 /* possible values for -o data= */
875 static const arg_desc_t logging_mode[] = {
876 {"ordered", 1 << REISERFS_DATA_ORDERED,
877 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
878 {"journal", 1 << REISERFS_DATA_LOG,
879 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
880 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
881 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
882 {.value = NULL}
883 };
884
885 /* possible values for -o barrier= */
886 static const arg_desc_t barrier_mode[] = {
887 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
888 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
889 {.value = NULL}
890 };
891
892 /*
893 * possible values for "-o block-allocator=" and bits which are to be set in
894 * s_mount_opt of reiserfs specific part of in-core super block
895 */
896 static const arg_desc_t balloc[] = {
897 {"noborder", 1 << REISERFS_NO_BORDER, 0},
898 {"border", 0, 1 << REISERFS_NO_BORDER},
899 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
900 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
901 {"test4", 1 << REISERFS_TEST4, 0},
902 {"notest4", 0, 1 << REISERFS_TEST4},
903 {NULL, 0, 0}
904 };
905
906 static const arg_desc_t tails[] = {
907 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
908 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
909 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
910 {NULL, 0, 0}
911 };
912
913 static const arg_desc_t error_actions[] = {
914 {"panic", 1 << REISERFS_ERROR_PANIC,
915 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
916 {"ro-remount", 1 << REISERFS_ERROR_RO,
917 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
918 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
919 {"continue", 1 << REISERFS_ERROR_CONTINUE,
920 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
921 #endif
922 {NULL, 0, 0},
923 };
924
925 /*
926 * proceed only one option from a list *cur - string containing of mount
927 * options
928 * opts - array of options which are accepted
929 * opt_arg - if option is found and requires an argument and if it is specifed
930 * in the input - pointer to the argument is stored here
931 * bit_flags - if option requires to set a certain bit - it is set here
932 * return -1 if unknown option is found, opt->arg_required otherwise
933 */
934 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
935 char **opt_arg, unsigned long *bit_flags)
936 {
937 char *p;
938 /*
939 * foo=bar,
940 * ^ ^ ^
941 * | | +-- option_end
942 * | +-- arg_start
943 * +-- option_start
944 */
945 const opt_desc_t *opt;
946 const arg_desc_t *arg;
947
948 p = *cur;
949
950 /* assume argument cannot contain commas */
951 *cur = strchr(p, ',');
952 if (*cur) {
953 *(*cur) = '\0';
954 (*cur)++;
955 }
956
957 if (!strncmp(p, "alloc=", 6)) {
958 /*
959 * Ugly special case, probably we should redo options
960 * parser so that it can understand several arguments for
961 * some options, also so that it can fill several bitfields
962 * with option values.
963 */
964 if (reiserfs_parse_alloc_options(s, p + 6)) {
965 return -1;
966 } else {
967 return 0;
968 }
969 }
970
971 /* for every option in the list */
972 for (opt = opts; opt->option_name; opt++) {
973 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
974 if (bit_flags) {
975 if (opt->clrmask ==
976 (1 << REISERFS_UNSUPPORTED_OPT))
977 reiserfs_warning(s, "super-6500",
978 "%s not supported.\n",
979 p);
980 else
981 *bit_flags &= ~opt->clrmask;
982 if (opt->setmask ==
983 (1 << REISERFS_UNSUPPORTED_OPT))
984 reiserfs_warning(s, "super-6501",
985 "%s not supported.\n",
986 p);
987 else
988 *bit_flags |= opt->setmask;
989 }
990 break;
991 }
992 }
993 if (!opt->option_name) {
994 reiserfs_warning(s, "super-6502",
995 "unknown mount option \"%s\"", p);
996 return -1;
997 }
998
999 p += strlen(opt->option_name);
1000 switch (*p) {
1001 case '=':
1002 if (!opt->arg_required) {
1003 reiserfs_warning(s, "super-6503",
1004 "the option \"%s\" does not "
1005 "require an argument\n",
1006 opt->option_name);
1007 return -1;
1008 }
1009 break;
1010
1011 case 0:
1012 if (opt->arg_required) {
1013 reiserfs_warning(s, "super-6504",
1014 "the option \"%s\" requires an "
1015 "argument\n", opt->option_name);
1016 return -1;
1017 }
1018 break;
1019 default:
1020 reiserfs_warning(s, "super-6505",
1021 "head of option \"%s\" is only correct\n",
1022 opt->option_name);
1023 return -1;
1024 }
1025
1026 /*
1027 * move to the argument, or to next option if argument is not
1028 * required
1029 */
1030 p++;
1031
1032 if (opt->arg_required
1033 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1034 && !strlen(p)) {
1035 /* this catches "option=," if not allowed */
1036 reiserfs_warning(s, "super-6506",
1037 "empty argument for \"%s\"\n",
1038 opt->option_name);
1039 return -1;
1040 }
1041
1042 if (!opt->values) {
1043 /* *=NULLopt_arg contains pointer to argument */
1044 *opt_arg = p;
1045 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1046 }
1047
1048 /* values possible for this option are listed in opt->values */
1049 for (arg = opt->values; arg->value; arg++) {
1050 if (!strcmp(p, arg->value)) {
1051 if (bit_flags) {
1052 *bit_flags &= ~arg->clrmask;
1053 *bit_flags |= arg->setmask;
1054 }
1055 return opt->arg_required;
1056 }
1057 }
1058
1059 reiserfs_warning(s, "super-6506",
1060 "bad value \"%s\" for option \"%s\"\n", p,
1061 opt->option_name);
1062 return -1;
1063 }
1064
1065 /* returns 0 if something is wrong in option string, 1 - otherwise */
1066 static int reiserfs_parse_options(struct super_block *s,
1067
1068 /* string given via mount's -o */
1069 char *options,
1070
1071 /*
1072 * after the parsing phase, contains the
1073 * collection of bitflags defining what
1074 * mount options were selected.
1075 */
1076 unsigned long *mount_options,
1077
1078 /* strtol-ed from NNN of resize=NNN */
1079 unsigned long *blocks,
1080 char **jdev_name,
1081 unsigned int *commit_max_age,
1082 char **qf_names,
1083 unsigned int *qfmt)
1084 {
1085 int c;
1086 char *arg = NULL;
1087 char *pos;
1088 opt_desc_t opts[] = {
1089 /*
1090 * Compatibility stuff, so that -o notail for old
1091 * setups still work
1092 */
1093 {"tails",.arg_required = 't',.values = tails},
1094 {"notail",.clrmask =
1095 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1096 {"conv",.setmask = 1 << REISERFS_CONVERT},
1097 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1098 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1099 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1100 #ifdef CONFIG_REISERFS_FS_XATTR
1101 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1102 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1103 #else
1104 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1105 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1106 #endif
1107 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1108 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1109 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1110 #else
1111 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1112 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1113 #endif
1114 {.option_name = "nolog"},
1115 {"replayonly",.setmask = 1 << REPLAYONLY},
1116 {"block-allocator",.arg_required = 'a',.values = balloc},
1117 {"data",.arg_required = 'd',.values = logging_mode},
1118 {"barrier",.arg_required = 'b',.values = barrier_mode},
1119 {"resize",.arg_required = 'r',.values = NULL},
1120 {"jdev",.arg_required = 'j',.values = NULL},
1121 {"nolargeio",.arg_required = 'w',.values = NULL},
1122 {"commit",.arg_required = 'c',.values = NULL},
1123 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1124 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1125 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1126 {"errors",.arg_required = 'e',.values = error_actions},
1127 {"usrjquota",.arg_required =
1128 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1129 {"grpjquota",.arg_required =
1130 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1131 {"jqfmt",.arg_required = 'f',.values = NULL},
1132 {.option_name = NULL}
1133 };
1134
1135 *blocks = 0;
1136 if (!options || !*options)
1137 /*
1138 * use default configuration: create tails, journaling on, no
1139 * conversion to newest format
1140 */
1141 return 1;
1142
1143 for (pos = options; pos;) {
1144 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1145 if (c == -1)
1146 /* wrong option is given */
1147 return 0;
1148
1149 if (c == 'r') {
1150 char *p;
1151
1152 p = NULL;
1153 /* "resize=NNN" or "resize=auto" */
1154
1155 if (!strcmp(arg, "auto")) {
1156 /* From JFS code, to auto-get the size. */
1157 *blocks =
1158 s->s_bdev->bd_inode->i_size >> s->
1159 s_blocksize_bits;
1160 } else {
1161 *blocks = simple_strtoul(arg, &p, 0);
1162 if (*p != '\0') {
1163 /* NNN does not look like a number */
1164 reiserfs_warning(s, "super-6507",
1165 "bad value %s for "
1166 "-oresize\n", arg);
1167 return 0;
1168 }
1169 }
1170 }
1171
1172 if (c == 'c') {
1173 char *p = NULL;
1174 unsigned long val = simple_strtoul(arg, &p, 0);
1175 /* commit=NNN (time in seconds) */
1176 if (*p != '\0' || val >= (unsigned int)-1) {
1177 reiserfs_warning(s, "super-6508",
1178 "bad value %s for -ocommit\n",
1179 arg);
1180 return 0;
1181 }
1182 *commit_max_age = (unsigned int)val;
1183 }
1184
1185 if (c == 'w') {
1186 reiserfs_warning(s, "super-6509", "nolargeio option "
1187 "is no longer supported");
1188 return 0;
1189 }
1190
1191 if (c == 'j') {
1192 if (arg && *arg && jdev_name) {
1193 /* Hm, already assigned? */
1194 if (*jdev_name) {
1195 reiserfs_warning(s, "super-6510",
1196 "journal device was "
1197 "already specified to "
1198 "be %s", *jdev_name);
1199 return 0;
1200 }
1201 *jdev_name = arg;
1202 }
1203 }
1204 #ifdef CONFIG_QUOTA
1205 if (c == 'u' || c == 'g') {
1206 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1207
1208 if (sb_any_quota_loaded(s) &&
1209 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1210 reiserfs_warning(s, "super-6511",
1211 "cannot change journaled "
1212 "quota options when quota "
1213 "turned on.");
1214 return 0;
1215 }
1216 if (*arg) { /* Some filename specified? */
1217 if (REISERFS_SB(s)->s_qf_names[qtype]
1218 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1219 arg)) {
1220 reiserfs_warning(s, "super-6512",
1221 "%s quota file "
1222 "already specified.",
1223 QTYPE2NAME(qtype));
1224 return 0;
1225 }
1226 if (strchr(arg, '/')) {
1227 reiserfs_warning(s, "super-6513",
1228 "quotafile must be "
1229 "on filesystem root.");
1230 return 0;
1231 }
1232 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1233 if (!qf_names[qtype]) {
1234 reiserfs_warning(s, "reiserfs-2502",
1235 "not enough memory "
1236 "for storing "
1237 "quotafile name.");
1238 return 0;
1239 }
1240 if (qtype == USRQUOTA)
1241 *mount_options |= 1 << REISERFS_USRQUOTA;
1242 else
1243 *mount_options |= 1 << REISERFS_GRPQUOTA;
1244 } else {
1245 if (qf_names[qtype] !=
1246 REISERFS_SB(s)->s_qf_names[qtype])
1247 kfree(qf_names[qtype]);
1248 qf_names[qtype] = NULL;
1249 if (qtype == USRQUOTA)
1250 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1251 else
1252 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1253 }
1254 }
1255 if (c == 'f') {
1256 if (!strcmp(arg, "vfsold"))
1257 *qfmt = QFMT_VFS_OLD;
1258 else if (!strcmp(arg, "vfsv0"))
1259 *qfmt = QFMT_VFS_V0;
1260 else {
1261 reiserfs_warning(s, "super-6514",
1262 "unknown quota format "
1263 "specified.");
1264 return 0;
1265 }
1266 if (sb_any_quota_loaded(s) &&
1267 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1268 reiserfs_warning(s, "super-6515",
1269 "cannot change journaled "
1270 "quota options when quota "
1271 "turned on.");
1272 return 0;
1273 }
1274 }
1275 #else
1276 if (c == 'u' || c == 'g' || c == 'f') {
1277 reiserfs_warning(s, "reiserfs-2503", "journaled "
1278 "quota options not supported.");
1279 return 0;
1280 }
1281 #endif
1282 }
1283
1284 #ifdef CONFIG_QUOTA
1285 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1286 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1287 reiserfs_warning(s, "super-6515",
1288 "journaled quota format not specified.");
1289 return 0;
1290 }
1291 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1292 sb_has_quota_loaded(s, USRQUOTA)) ||
1293 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1294 sb_has_quota_loaded(s, GRPQUOTA))) {
1295 reiserfs_warning(s, "super-6516", "quota options must "
1296 "be present when quota is turned on.");
1297 return 0;
1298 }
1299 #endif
1300
1301 return 1;
1302 }
1303
1304 static void switch_data_mode(struct super_block *s, unsigned long mode)
1305 {
1306 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1307 (1 << REISERFS_DATA_ORDERED) |
1308 (1 << REISERFS_DATA_WRITEBACK));
1309 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1310 }
1311
1312 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1313 {
1314 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1315 if (!reiserfs_data_log(s)) {
1316 switch_data_mode(s, REISERFS_DATA_LOG);
1317 reiserfs_info(s, "switching to journaled data mode\n");
1318 }
1319 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1320 if (!reiserfs_data_ordered(s)) {
1321 switch_data_mode(s, REISERFS_DATA_ORDERED);
1322 reiserfs_info(s, "switching to ordered data mode\n");
1323 }
1324 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1325 if (!reiserfs_data_writeback(s)) {
1326 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1327 reiserfs_info(s, "switching to writeback data mode\n");
1328 }
1329 }
1330 }
1331
1332 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1333 {
1334 int flush = (1 << REISERFS_BARRIER_FLUSH);
1335 int none = (1 << REISERFS_BARRIER_NONE);
1336 int all_barrier = flush | none;
1337
1338 if (bits & all_barrier) {
1339 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1340 if (bits & flush) {
1341 REISERFS_SB(s)->s_mount_opt |= flush;
1342 printk("reiserfs: enabling write barrier flush mode\n");
1343 } else if (bits & none) {
1344 REISERFS_SB(s)->s_mount_opt |= none;
1345 printk("reiserfs: write barriers turned off\n");
1346 }
1347 }
1348 }
1349
1350 static void handle_attrs(struct super_block *s)
1351 {
1352 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1353
1354 if (reiserfs_attrs(s)) {
1355 if (old_format_only(s)) {
1356 reiserfs_warning(s, "super-6517", "cannot support "
1357 "attributes on 3.5.x disk format");
1358 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1359 return;
1360 }
1361 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1362 reiserfs_warning(s, "super-6518", "cannot support "
1363 "attributes until flag is set in "
1364 "super-block");
1365 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1366 }
1367 }
1368 }
1369
1370 #ifdef CONFIG_QUOTA
1371 static void handle_quota_files(struct super_block *s, char **qf_names,
1372 unsigned int *qfmt)
1373 {
1374 int i;
1375
1376 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1377 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1378 kfree(REISERFS_SB(s)->s_qf_names[i]);
1379 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1380 }
1381 if (*qfmt)
1382 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1383 }
1384 #endif
1385
1386 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1387 {
1388 struct reiserfs_super_block *rs;
1389 struct reiserfs_transaction_handle th;
1390 unsigned long blocks;
1391 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1392 unsigned long safe_mask = 0;
1393 unsigned int commit_max_age = (unsigned int)-1;
1394 struct reiserfs_journal *journal = SB_JOURNAL(s);
1395 char *new_opts = kstrdup(arg, GFP_KERNEL);
1396 int err;
1397 char *qf_names[REISERFS_MAXQUOTAS];
1398 unsigned int qfmt = 0;
1399 #ifdef CONFIG_QUOTA
1400 int i;
1401 #endif
1402
1403 sync_filesystem(s);
1404 reiserfs_write_lock(s);
1405
1406 #ifdef CONFIG_QUOTA
1407 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1408 #endif
1409
1410 rs = SB_DISK_SUPER_BLOCK(s);
1411
1412 if (!reiserfs_parse_options
1413 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1414 qf_names, &qfmt)) {
1415 #ifdef CONFIG_QUOTA
1416 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1417 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1418 kfree(qf_names[i]);
1419 #endif
1420 err = -EINVAL;
1421 goto out_err_unlock;
1422 }
1423 #ifdef CONFIG_QUOTA
1424 handle_quota_files(s, qf_names, &qfmt);
1425 #endif
1426
1427 handle_attrs(s);
1428
1429 /* Add options that are safe here */
1430 safe_mask |= 1 << REISERFS_SMALLTAIL;
1431 safe_mask |= 1 << REISERFS_LARGETAIL;
1432 safe_mask |= 1 << REISERFS_NO_BORDER;
1433 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1434 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1435 safe_mask |= 1 << REISERFS_TEST4;
1436 safe_mask |= 1 << REISERFS_ATTRS;
1437 safe_mask |= 1 << REISERFS_XATTRS_USER;
1438 safe_mask |= 1 << REISERFS_POSIXACL;
1439 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1440 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1441 safe_mask |= 1 << REISERFS_ERROR_RO;
1442 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1443 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1444 safe_mask |= 1 << REISERFS_USRQUOTA;
1445 safe_mask |= 1 << REISERFS_GRPQUOTA;
1446
1447 /*
1448 * Update the bitmask, taking care to keep
1449 * the bits we're not allowed to change here
1450 */
1451 REISERFS_SB(s)->s_mount_opt =
1452 (REISERFS_SB(s)->
1453 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1454
1455 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1456 journal->j_max_commit_age = commit_max_age;
1457 journal->j_max_trans_age = commit_max_age;
1458 } else if (commit_max_age == 0) {
1459 /* 0 means restore defaults. */
1460 journal->j_max_commit_age = journal->j_default_max_commit_age;
1461 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1462 }
1463
1464 if (blocks) {
1465 err = reiserfs_resize(s, blocks);
1466 if (err != 0)
1467 goto out_err_unlock;
1468 }
1469
1470 if (*mount_flags & MS_RDONLY) {
1471 reiserfs_write_unlock(s);
1472 reiserfs_xattr_init(s, *mount_flags);
1473 /* remount read-only */
1474 if (s->s_flags & MS_RDONLY)
1475 /* it is read-only already */
1476 goto out_ok_unlocked;
1477
1478 err = dquot_suspend(s, -1);
1479 if (err < 0)
1480 goto out_err;
1481
1482 /* try to remount file system with read-only permissions */
1483 if (sb_umount_state(rs) == REISERFS_VALID_FS
1484 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1485 goto out_ok_unlocked;
1486 }
1487
1488 reiserfs_write_lock(s);
1489
1490 err = journal_begin(&th, s, 10);
1491 if (err)
1492 goto out_err_unlock;
1493
1494 /* Mounting a rw partition read-only. */
1495 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1496 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1497 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1498 } else {
1499 /* remount read-write */
1500 if (!(s->s_flags & MS_RDONLY)) {
1501 reiserfs_write_unlock(s);
1502 reiserfs_xattr_init(s, *mount_flags);
1503 goto out_ok_unlocked; /* We are read-write already */
1504 }
1505
1506 if (reiserfs_is_journal_aborted(journal)) {
1507 err = journal->j_errno;
1508 goto out_err_unlock;
1509 }
1510
1511 handle_data_mode(s, mount_options);
1512 handle_barrier_mode(s, mount_options);
1513 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1514
1515 /* now it is safe to call journal_begin */
1516 s->s_flags &= ~MS_RDONLY;
1517 err = journal_begin(&th, s, 10);
1518 if (err)
1519 goto out_err_unlock;
1520
1521 /* Mount a partition which is read-only, read-write */
1522 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1523 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1524 s->s_flags &= ~MS_RDONLY;
1525 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1526 if (!old_format_only(s))
1527 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1528 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1529 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1530 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1531 }
1532 /* this will force a full flush of all journal lists */
1533 SB_JOURNAL(s)->j_must_wait = 1;
1534 err = journal_end(&th);
1535 if (err)
1536 goto out_err_unlock;
1537
1538 reiserfs_write_unlock(s);
1539 if (!(*mount_flags & MS_RDONLY)) {
1540 dquot_resume(s, -1);
1541 reiserfs_write_lock(s);
1542 finish_unfinished(s);
1543 reiserfs_write_unlock(s);
1544 reiserfs_xattr_init(s, *mount_flags);
1545 }
1546
1547 out_ok_unlocked:
1548 replace_mount_options(s, new_opts);
1549 return 0;
1550
1551 out_err_unlock:
1552 reiserfs_write_unlock(s);
1553 out_err:
1554 kfree(new_opts);
1555 return err;
1556 }
1557
1558 static int read_super_block(struct super_block *s, int offset)
1559 {
1560 struct buffer_head *bh;
1561 struct reiserfs_super_block *rs;
1562 int fs_blocksize;
1563
1564 bh = sb_bread(s, offset / s->s_blocksize);
1565 if (!bh) {
1566 reiserfs_warning(s, "sh-2006",
1567 "bread failed (dev %s, block %lu, size %lu)",
1568 s->s_id, offset / s->s_blocksize,
1569 s->s_blocksize);
1570 return 1;
1571 }
1572
1573 rs = (struct reiserfs_super_block *)bh->b_data;
1574 if (!is_any_reiserfs_magic_string(rs)) {
1575 brelse(bh);
1576 return 1;
1577 }
1578 /*
1579 * ok, reiserfs signature (old or new) found in at the given offset
1580 */
1581 fs_blocksize = sb_blocksize(rs);
1582 brelse(bh);
1583 sb_set_blocksize(s, fs_blocksize);
1584
1585 bh = sb_bread(s, offset / s->s_blocksize);
1586 if (!bh) {
1587 reiserfs_warning(s, "sh-2007",
1588 "bread failed (dev %s, block %lu, size %lu)",
1589 s->s_id, offset / s->s_blocksize,
1590 s->s_blocksize);
1591 return 1;
1592 }
1593
1594 rs = (struct reiserfs_super_block *)bh->b_data;
1595 if (sb_blocksize(rs) != s->s_blocksize) {
1596 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1597 "filesystem on (dev %s, block %llu, size %lu)",
1598 s->s_id,
1599 (unsigned long long)bh->b_blocknr,
1600 s->s_blocksize);
1601 brelse(bh);
1602 return 1;
1603 }
1604
1605 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1606 brelse(bh);
1607 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1608 "--rebuild-tree run detected. Please run\n"
1609 "reiserfsck --rebuild-tree and wait for a "
1610 "completion. If that fails\n"
1611 "get newer reiserfsprogs package");
1612 return 1;
1613 }
1614
1615 SB_BUFFER_WITH_SB(s) = bh;
1616 SB_DISK_SUPER_BLOCK(s) = rs;
1617
1618 /*
1619 * magic is of non-standard journal filesystem, look at s_version to
1620 * find which format is in use
1621 */
1622 if (is_reiserfs_jr(rs)) {
1623 if (sb_version(rs) == REISERFS_VERSION_2)
1624 reiserfs_info(s, "found reiserfs format \"3.6\""
1625 " with non-standard journal\n");
1626 else if (sb_version(rs) == REISERFS_VERSION_1)
1627 reiserfs_info(s, "found reiserfs format \"3.5\""
1628 " with non-standard journal\n");
1629 else {
1630 reiserfs_warning(s, "sh-2012", "found unknown "
1631 "format \"%u\" of reiserfs with "
1632 "non-standard magic", sb_version(rs));
1633 return 1;
1634 }
1635 } else
1636 /*
1637 * s_version of standard format may contain incorrect
1638 * information, so we just look at the magic string
1639 */
1640 reiserfs_info(s,
1641 "found reiserfs format \"%s\" with standard journal\n",
1642 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1643
1644 s->s_op = &reiserfs_sops;
1645 s->s_export_op = &reiserfs_export_ops;
1646 #ifdef CONFIG_QUOTA
1647 s->s_qcop = &reiserfs_qctl_operations;
1648 s->dq_op = &reiserfs_quota_operations;
1649 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1650 #endif
1651
1652 /*
1653 * new format is limited by the 32 bit wide i_blocks field, want to
1654 * be one full block below that.
1655 */
1656 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1657 return 0;
1658 }
1659
1660 /* after journal replay, reread all bitmap and super blocks */
1661 static int reread_meta_blocks(struct super_block *s)
1662 {
1663 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1664 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1665 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1666 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1667 return 1;
1668 }
1669
1670 return 0;
1671 }
1672
1673 /* hash detection stuff */
1674
1675 /*
1676 * if root directory is empty - we set default - Yura's - hash and
1677 * warn about it
1678 * FIXME: we look for only one name in a directory. If tea and yura
1679 * both have the same value - we ask user to send report to the
1680 * mailing list
1681 */
1682 static __u32 find_hash_out(struct super_block *s)
1683 {
1684 int retval;
1685 struct inode *inode;
1686 struct cpu_key key;
1687 INITIALIZE_PATH(path);
1688 struct reiserfs_dir_entry de;
1689 struct reiserfs_de_head *deh;
1690 __u32 hash = DEFAULT_HASH;
1691 __u32 deh_hashval, teahash, r5hash, yurahash;
1692
1693 inode = d_inode(s->s_root);
1694
1695 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1696 retval = search_by_entry_key(s, &key, &path, &de);
1697 if (retval == IO_ERROR) {
1698 pathrelse(&path);
1699 return UNSET_HASH;
1700 }
1701 if (retval == NAME_NOT_FOUND)
1702 de.de_entry_num--;
1703
1704 set_de_name_and_namelen(&de);
1705 deh = de.de_deh + de.de_entry_num;
1706
1707 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1708 /* allow override in this case */
1709 if (reiserfs_rupasov_hash(s))
1710 hash = YURA_HASH;
1711 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1712 goto out;
1713 }
1714
1715 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1716 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1717 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1718 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1719
1720 if ((teahash == r5hash && deh_hashval == r5hash) ||
1721 (teahash == yurahash && deh_hashval == yurahash) ||
1722 (r5hash == yurahash && deh_hashval == yurahash)) {
1723 reiserfs_warning(s, "reiserfs-2506",
1724 "Unable to automatically detect hash "
1725 "function. Please mount with -o "
1726 "hash={tea,rupasov,r5}");
1727 hash = UNSET_HASH;
1728 goto out;
1729 }
1730
1731 if (deh_hashval == yurahash)
1732 hash = YURA_HASH;
1733 else if (deh_hashval == teahash)
1734 hash = TEA_HASH;
1735 else if (deh_hashval == r5hash)
1736 hash = R5_HASH;
1737 else {
1738 reiserfs_warning(s, "reiserfs-2506",
1739 "Unrecognised hash function");
1740 hash = UNSET_HASH;
1741 }
1742 out:
1743 pathrelse(&path);
1744 return hash;
1745 }
1746
1747 /* finds out which hash names are sorted with */
1748 static int what_hash(struct super_block *s)
1749 {
1750 __u32 code;
1751
1752 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1753
1754 /*
1755 * reiserfs_hash_detect() == true if any of the hash mount options
1756 * were used. We must check them to make sure the user isn't
1757 * using a bad hash value
1758 */
1759 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1760 code = find_hash_out(s);
1761
1762 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1763 /*
1764 * detection has found the hash, and we must check against the
1765 * mount options
1766 */
1767 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1768 reiserfs_warning(s, "reiserfs-2507",
1769 "Error, %s hash detected, "
1770 "unable to force rupasov hash",
1771 reiserfs_hashname(code));
1772 code = UNSET_HASH;
1773 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1774 reiserfs_warning(s, "reiserfs-2508",
1775 "Error, %s hash detected, "
1776 "unable to force tea hash",
1777 reiserfs_hashname(code));
1778 code = UNSET_HASH;
1779 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1780 reiserfs_warning(s, "reiserfs-2509",
1781 "Error, %s hash detected, "
1782 "unable to force r5 hash",
1783 reiserfs_hashname(code));
1784 code = UNSET_HASH;
1785 }
1786 } else {
1787 /*
1788 * find_hash_out was not called or
1789 * could not determine the hash
1790 */
1791 if (reiserfs_rupasov_hash(s)) {
1792 code = YURA_HASH;
1793 } else if (reiserfs_tea_hash(s)) {
1794 code = TEA_HASH;
1795 } else if (reiserfs_r5_hash(s)) {
1796 code = R5_HASH;
1797 }
1798 }
1799
1800 /*
1801 * if we are mounted RW, and we have a new valid hash code, update
1802 * the super
1803 */
1804 if (code != UNSET_HASH &&
1805 !(s->s_flags & MS_RDONLY) &&
1806 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1807 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1808 }
1809 return code;
1810 }
1811
1812 /* return pointer to appropriate function */
1813 static hashf_t hash_function(struct super_block *s)
1814 {
1815 switch (what_hash(s)) {
1816 case TEA_HASH:
1817 reiserfs_info(s, "Using tea hash to sort names\n");
1818 return keyed_hash;
1819 case YURA_HASH:
1820 reiserfs_info(s, "Using rupasov hash to sort names\n");
1821 return yura_hash;
1822 case R5_HASH:
1823 reiserfs_info(s, "Using r5 hash to sort names\n");
1824 return r5_hash;
1825 }
1826 return NULL;
1827 }
1828
1829 /* this is used to set up correct value for old partitions */
1830 static int function2code(hashf_t func)
1831 {
1832 if (func == keyed_hash)
1833 return TEA_HASH;
1834 if (func == yura_hash)
1835 return YURA_HASH;
1836 if (func == r5_hash)
1837 return R5_HASH;
1838
1839 BUG(); /* should never happen */
1840
1841 return 0;
1842 }
1843
1844 #define SWARN(silent, s, id, ...) \
1845 if (!(silent)) \
1846 reiserfs_warning(s, id, __VA_ARGS__)
1847
1848 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1849 {
1850 struct inode *root_inode;
1851 struct reiserfs_transaction_handle th;
1852 int old_format = 0;
1853 unsigned long blocks;
1854 unsigned int commit_max_age = 0;
1855 int jinit_done = 0;
1856 struct reiserfs_iget_args args;
1857 struct reiserfs_super_block *rs;
1858 char *jdev_name;
1859 struct reiserfs_sb_info *sbi;
1860 int errval = -EINVAL;
1861 char *qf_names[REISERFS_MAXQUOTAS] = {};
1862 unsigned int qfmt = 0;
1863
1864 save_mount_options(s, data);
1865
1866 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1867 if (!sbi)
1868 return -ENOMEM;
1869 s->s_fs_info = sbi;
1870 /* Set default values for options: non-aggressive tails, RO on errors */
1871 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1872 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1873 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1874 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1875 sbi->s_alloc_options.preallocmin = 0;
1876 /* Preallocate by 16 blocks (17-1) at once */
1877 sbi->s_alloc_options.preallocsize = 17;
1878 /* setup default block allocator options */
1879 reiserfs_init_alloc_options(s);
1880
1881 spin_lock_init(&sbi->old_work_lock);
1882 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1883 mutex_init(&sbi->lock);
1884 sbi->lock_depth = -1;
1885
1886 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1887 s->s_id);
1888 if (!sbi->commit_wq) {
1889 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1890 errval = -ENOMEM;
1891 goto error_unlocked;
1892 }
1893
1894 jdev_name = NULL;
1895 if (reiserfs_parse_options
1896 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1897 &commit_max_age, qf_names, &qfmt) == 0) {
1898 goto error_unlocked;
1899 }
1900 if (jdev_name && jdev_name[0]) {
1901 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1902 if (!sbi->s_jdev) {
1903 SWARN(silent, s, "", "Cannot allocate memory for "
1904 "journal device name");
1905 goto error;
1906 }
1907 }
1908 #ifdef CONFIG_QUOTA
1909 handle_quota_files(s, qf_names, &qfmt);
1910 #endif
1911
1912 if (blocks) {
1913 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1914 goto error_unlocked;
1915 }
1916
1917 /*
1918 * try old format (undistributed bitmap, super block in 8-th 1k
1919 * block of a device)
1920 */
1921 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1922 old_format = 1;
1923
1924 /*
1925 * try new format (64-th 1k block), which can contain reiserfs
1926 * super block
1927 */
1928 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1929 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1930 s->s_id);
1931 goto error_unlocked;
1932 }
1933
1934 rs = SB_DISK_SUPER_BLOCK(s);
1935 /*
1936 * Let's do basic sanity check to verify that underlying device is not
1937 * smaller than the filesystem. If the check fails then abort and
1938 * scream, because bad stuff will happen otherwise.
1939 */
1940 if (s->s_bdev && s->s_bdev->bd_inode
1941 && i_size_read(s->s_bdev->bd_inode) <
1942 sb_block_count(rs) * sb_blocksize(rs)) {
1943 SWARN(silent, s, "", "Filesystem cannot be "
1944 "mounted because it is bigger than the device");
1945 SWARN(silent, s, "", "You may need to run fsck "
1946 "or increase size of your LVM partition");
1947 SWARN(silent, s, "", "Or may be you forgot to "
1948 "reboot after fdisk when it told you to");
1949 goto error_unlocked;
1950 }
1951
1952 sbi->s_mount_state = SB_REISERFS_STATE(s);
1953 sbi->s_mount_state = REISERFS_VALID_FS;
1954
1955 if ((errval = reiserfs_init_bitmap_cache(s))) {
1956 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1957 goto error_unlocked;
1958 }
1959
1960 errval = -EINVAL;
1961 #ifdef CONFIG_REISERFS_CHECK
1962 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1963 SWARN(silent, s, "", "- it is slow mode for debugging.");
1964 #endif
1965
1966 /* make data=ordered the default */
1967 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1968 !reiserfs_data_writeback(s)) {
1969 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1970 }
1971
1972 if (reiserfs_data_log(s)) {
1973 reiserfs_info(s, "using journaled data mode\n");
1974 } else if (reiserfs_data_ordered(s)) {
1975 reiserfs_info(s, "using ordered data mode\n");
1976 } else {
1977 reiserfs_info(s, "using writeback data mode\n");
1978 }
1979 if (reiserfs_barrier_flush(s)) {
1980 printk("reiserfs: using flush barriers\n");
1981 }
1982
1983 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1984 SWARN(silent, s, "sh-2022",
1985 "unable to initialize journal space");
1986 goto error_unlocked;
1987 } else {
1988 /*
1989 * once this is set, journal_release must be called
1990 * if we error out of the mount
1991 */
1992 jinit_done = 1;
1993 }
1994
1995 if (reread_meta_blocks(s)) {
1996 SWARN(silent, s, "jmacd-9",
1997 "unable to reread meta blocks after journal init");
1998 goto error_unlocked;
1999 }
2000
2001 if (replay_only(s))
2002 goto error_unlocked;
2003
2004 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2005 SWARN(silent, s, "clm-7000",
2006 "Detected readonly device, marking FS readonly");
2007 s->s_flags |= MS_RDONLY;
2008 }
2009 args.objectid = REISERFS_ROOT_OBJECTID;
2010 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2011 root_inode =
2012 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2013 reiserfs_init_locked_inode, (void *)&args);
2014 if (!root_inode) {
2015 SWARN(silent, s, "jmacd-10", "get root inode failed");
2016 goto error_unlocked;
2017 }
2018
2019 /*
2020 * This path assumed to be called with the BKL in the old times.
2021 * Now we have inherited the big reiserfs lock from it and many
2022 * reiserfs helpers called in the mount path and elsewhere require
2023 * this lock to be held even if it's not always necessary. Let's be
2024 * conservative and hold it early. The window can be reduced after
2025 * careful review of the code.
2026 */
2027 reiserfs_write_lock(s);
2028
2029 if (root_inode->i_state & I_NEW) {
2030 reiserfs_read_locked_inode(root_inode, &args);
2031 unlock_new_inode(root_inode);
2032 }
2033
2034 s->s_root = d_make_root(root_inode);
2035 if (!s->s_root)
2036 goto error;
2037 /* define and initialize hash function */
2038 sbi->s_hash_function = hash_function(s);
2039 if (sbi->s_hash_function == NULL) {
2040 dput(s->s_root);
2041 s->s_root = NULL;
2042 goto error;
2043 }
2044
2045 if (is_reiserfs_3_5(rs)
2046 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2047 set_bit(REISERFS_3_5, &sbi->s_properties);
2048 else if (old_format)
2049 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2050 else
2051 set_bit(REISERFS_3_6, &sbi->s_properties);
2052
2053 if (!(s->s_flags & MS_RDONLY)) {
2054
2055 errval = journal_begin(&th, s, 1);
2056 if (errval) {
2057 dput(s->s_root);
2058 s->s_root = NULL;
2059 goto error;
2060 }
2061 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2062
2063 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2064 set_sb_fs_state(rs, 0);
2065
2066 /*
2067 * Clear out s_bmap_nr if it would wrap. We can handle this
2068 * case, but older revisions can't. This will cause the
2069 * file system to fail mount on those older implementations,
2070 * avoiding corruption. -jeffm
2071 */
2072 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2073 sb_bmap_nr(rs) != 0) {
2074 reiserfs_warning(s, "super-2030", "This file system "
2075 "claims to use %u bitmap blocks in "
2076 "its super block, but requires %u. "
2077 "Clearing to zero.", sb_bmap_nr(rs),
2078 reiserfs_bmap_count(s));
2079
2080 set_sb_bmap_nr(rs, 0);
2081 }
2082
2083 if (old_format_only(s)) {
2084 /*
2085 * filesystem of format 3.5 either with standard
2086 * or non-standard journal
2087 */
2088 if (convert_reiserfs(s)) {
2089 /* and -o conv is given */
2090 if (!silent)
2091 reiserfs_info(s,
2092 "converting 3.5 filesystem to the 3.6 format");
2093
2094 if (is_reiserfs_3_5(rs))
2095 /*
2096 * put magic string of 3.6 format.
2097 * 2.2 will not be able to
2098 * mount this filesystem anymore
2099 */
2100 memcpy(rs->s_v1.s_magic,
2101 reiserfs_3_6_magic_string,
2102 sizeof
2103 (reiserfs_3_6_magic_string));
2104
2105 set_sb_version(rs, REISERFS_VERSION_2);
2106 reiserfs_convert_objectid_map_v1(s);
2107 set_bit(REISERFS_3_6, &sbi->s_properties);
2108 clear_bit(REISERFS_3_5, &sbi->s_properties);
2109 } else if (!silent) {
2110 reiserfs_info(s, "using 3.5.x disk format\n");
2111 }
2112 } else
2113 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2114
2115
2116 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2117 errval = journal_end(&th);
2118 if (errval) {
2119 dput(s->s_root);
2120 s->s_root = NULL;
2121 goto error;
2122 }
2123
2124 reiserfs_write_unlock(s);
2125 if ((errval = reiserfs_lookup_privroot(s)) ||
2126 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2127 dput(s->s_root);
2128 s->s_root = NULL;
2129 goto error_unlocked;
2130 }
2131 reiserfs_write_lock(s);
2132
2133 /*
2134 * look for files which were to be removed in previous session
2135 */
2136 finish_unfinished(s);
2137 } else {
2138 if (old_format_only(s) && !silent) {
2139 reiserfs_info(s, "using 3.5.x disk format\n");
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 * mark hash in super block: it could be unset. overwrite should be ok
2153 */
2154 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2155
2156 handle_attrs(s);
2157
2158 reiserfs_proc_info_init(s);
2159
2160 init_waitqueue_head(&(sbi->s_wait));
2161 spin_lock_init(&sbi->bitmap_lock);
2162
2163 reiserfs_write_unlock(s);
2164
2165 return (0);
2166
2167 error:
2168 reiserfs_write_unlock(s);
2169
2170 error_unlocked:
2171 /* kill the commit thread, free journal ram */
2172 if (jinit_done) {
2173 reiserfs_write_lock(s);
2174 journal_release_error(NULL, s);
2175 reiserfs_write_unlock(s);
2176 }
2177
2178 if (sbi->commit_wq)
2179 destroy_workqueue(sbi->commit_wq);
2180
2181 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2182
2183 reiserfs_free_bitmap_cache(s);
2184 if (SB_BUFFER_WITH_SB(s))
2185 brelse(SB_BUFFER_WITH_SB(s));
2186 #ifdef CONFIG_QUOTA
2187 {
2188 int j;
2189 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2190 kfree(qf_names[j]);
2191 }
2192 #endif
2193 kfree(sbi);
2194
2195 s->s_fs_info = NULL;
2196 return errval;
2197 }
2198
2199 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2200 {
2201 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2202
2203 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2204 buf->f_bfree = sb_free_blocks(rs);
2205 buf->f_bavail = buf->f_bfree;
2206 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2207 buf->f_bsize = dentry->d_sb->s_blocksize;
2208 /* changed to accommodate gcc folks. */
2209 buf->f_type = REISERFS_SUPER_MAGIC;
2210 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2211 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2212 sizeof(rs->s_uuid)/2);
2213
2214 return 0;
2215 }
2216
2217 #ifdef CONFIG_QUOTA
2218 static int reiserfs_write_dquot(struct dquot *dquot)
2219 {
2220 struct reiserfs_transaction_handle th;
2221 int ret, err;
2222 int depth;
2223
2224 reiserfs_write_lock(dquot->dq_sb);
2225 ret =
2226 journal_begin(&th, dquot->dq_sb,
2227 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2228 if (ret)
2229 goto out;
2230 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2231 ret = dquot_commit(dquot);
2232 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2233 err = journal_end(&th);
2234 if (!ret && err)
2235 ret = err;
2236 out:
2237 reiserfs_write_unlock(dquot->dq_sb);
2238 return ret;
2239 }
2240
2241 static int reiserfs_acquire_dquot(struct dquot *dquot)
2242 {
2243 struct reiserfs_transaction_handle th;
2244 int ret, err;
2245 int depth;
2246
2247 reiserfs_write_lock(dquot->dq_sb);
2248 ret =
2249 journal_begin(&th, dquot->dq_sb,
2250 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2251 if (ret)
2252 goto out;
2253 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2254 ret = dquot_acquire(dquot);
2255 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2256 err = journal_end(&th);
2257 if (!ret && err)
2258 ret = err;
2259 out:
2260 reiserfs_write_unlock(dquot->dq_sb);
2261 return ret;
2262 }
2263
2264 static int reiserfs_release_dquot(struct dquot *dquot)
2265 {
2266 struct reiserfs_transaction_handle th;
2267 int ret, err;
2268
2269 reiserfs_write_lock(dquot->dq_sb);
2270 ret =
2271 journal_begin(&th, dquot->dq_sb,
2272 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2273 reiserfs_write_unlock(dquot->dq_sb);
2274 if (ret) {
2275 /* Release dquot anyway to avoid endless cycle in dqput() */
2276 dquot_release(dquot);
2277 goto out;
2278 }
2279 ret = dquot_release(dquot);
2280 reiserfs_write_lock(dquot->dq_sb);
2281 err = journal_end(&th);
2282 if (!ret && err)
2283 ret = err;
2284 reiserfs_write_unlock(dquot->dq_sb);
2285 out:
2286 return ret;
2287 }
2288
2289 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2290 {
2291 /* Are we journaling quotas? */
2292 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2293 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2294 dquot_mark_dquot_dirty(dquot);
2295 return reiserfs_write_dquot(dquot);
2296 } else
2297 return dquot_mark_dquot_dirty(dquot);
2298 }
2299
2300 static int reiserfs_write_info(struct super_block *sb, int type)
2301 {
2302 struct reiserfs_transaction_handle th;
2303 int ret, err;
2304 int depth;
2305
2306 /* Data block + inode block */
2307 reiserfs_write_lock(sb);
2308 ret = journal_begin(&th, sb, 2);
2309 if (ret)
2310 goto out;
2311 depth = reiserfs_write_unlock_nested(sb);
2312 ret = dquot_commit_info(sb, type);
2313 reiserfs_write_lock_nested(sb, depth);
2314 err = journal_end(&th);
2315 if (!ret && err)
2316 ret = err;
2317 out:
2318 reiserfs_write_unlock(sb);
2319 return ret;
2320 }
2321
2322 /*
2323 * Turn on quotas during mount time - we need to find the quota file and such...
2324 */
2325 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2326 {
2327 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2328 REISERFS_SB(sb)->s_jquota_fmt, type);
2329 }
2330
2331 /*
2332 * Standard function to be called on quota_on
2333 */
2334 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2335 struct path *path)
2336 {
2337 int err;
2338 struct inode *inode;
2339 struct reiserfs_transaction_handle th;
2340 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2341
2342 reiserfs_write_lock(sb);
2343 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2344 err = -EINVAL;
2345 goto out;
2346 }
2347
2348 /* Quotafile not on the same filesystem? */
2349 if (path->dentry->d_sb != sb) {
2350 err = -EXDEV;
2351 goto out;
2352 }
2353 inode = d_inode(path->dentry);
2354 /*
2355 * We must not pack tails for quota files on reiserfs for quota
2356 * IO to work
2357 */
2358 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2359 err = reiserfs_unpack(inode, NULL);
2360 if (err) {
2361 reiserfs_warning(sb, "super-6520",
2362 "Unpacking tail of quota file failed"
2363 " (%d). Cannot turn on quotas.", err);
2364 err = -EINVAL;
2365 goto out;
2366 }
2367 mark_inode_dirty(inode);
2368 }
2369 /* Journaling quota? */
2370 if (REISERFS_SB(sb)->s_qf_names[type]) {
2371 /* Quotafile not of fs root? */
2372 if (path->dentry->d_parent != sb->s_root)
2373 reiserfs_warning(sb, "super-6521",
2374 "Quota file not on filesystem root. "
2375 "Journalled quota will not work.");
2376 }
2377
2378 /*
2379 * When we journal data on quota file, we have to flush journal to see
2380 * all updates to the file when we bypass pagecache...
2381 */
2382 if (reiserfs_file_data_log(inode)) {
2383 /* Just start temporary transaction and finish it */
2384 err = journal_begin(&th, sb, 1);
2385 if (err)
2386 goto out;
2387 err = journal_end_sync(&th);
2388 if (err)
2389 goto out;
2390 }
2391 reiserfs_write_unlock(sb);
2392 return dquot_quota_on(sb, type, format_id, path);
2393 out:
2394 reiserfs_write_unlock(sb);
2395 return err;
2396 }
2397
2398 /*
2399 * Read data from quotafile - avoid pagecache and such because we cannot afford
2400 * acquiring the locks... As quota files are never truncated and quota code
2401 * itself serializes the operations (and no one else should touch the files)
2402 * we don't have to be afraid of races
2403 */
2404 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2405 size_t len, loff_t off)
2406 {
2407 struct inode *inode = sb_dqopt(sb)->files[type];
2408 unsigned long blk = off >> sb->s_blocksize_bits;
2409 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2410 size_t toread;
2411 struct buffer_head tmp_bh, *bh;
2412 loff_t i_size = i_size_read(inode);
2413
2414 if (off > i_size)
2415 return 0;
2416 if (off + len > i_size)
2417 len = i_size - off;
2418 toread = len;
2419 while (toread > 0) {
2420 tocopy =
2421 sb->s_blocksize - offset <
2422 toread ? sb->s_blocksize - offset : toread;
2423 tmp_bh.b_state = 0;
2424 /*
2425 * Quota files are without tails so we can safely
2426 * use this function
2427 */
2428 reiserfs_write_lock(sb);
2429 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2430 reiserfs_write_unlock(sb);
2431 if (err)
2432 return err;
2433 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2434 memset(data, 0, tocopy);
2435 else {
2436 bh = sb_bread(sb, tmp_bh.b_blocknr);
2437 if (!bh)
2438 return -EIO;
2439 memcpy(data, bh->b_data + offset, tocopy);
2440 brelse(bh);
2441 }
2442 offset = 0;
2443 toread -= tocopy;
2444 data += tocopy;
2445 blk++;
2446 }
2447 return len;
2448 }
2449
2450 /*
2451 * Write to quotafile (we know the transaction is already started and has
2452 * enough credits)
2453 */
2454 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2455 const char *data, size_t len, loff_t off)
2456 {
2457 struct inode *inode = sb_dqopt(sb)->files[type];
2458 unsigned long blk = off >> sb->s_blocksize_bits;
2459 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2460 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2461 size_t towrite = len;
2462 struct buffer_head tmp_bh, *bh;
2463
2464 if (!current->journal_info) {
2465 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2466 (unsigned long long)off, (unsigned long long)len);
2467 return -EIO;
2468 }
2469 while (towrite > 0) {
2470 tocopy = sb->s_blocksize - offset < towrite ?
2471 sb->s_blocksize - offset : towrite;
2472 tmp_bh.b_state = 0;
2473 reiserfs_write_lock(sb);
2474 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2475 reiserfs_write_unlock(sb);
2476 if (err)
2477 goto out;
2478 if (offset || tocopy != sb->s_blocksize)
2479 bh = sb_bread(sb, tmp_bh.b_blocknr);
2480 else
2481 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2482 if (!bh) {
2483 err = -EIO;
2484 goto out;
2485 }
2486 lock_buffer(bh);
2487 memcpy(bh->b_data + offset, data, tocopy);
2488 flush_dcache_page(bh->b_page);
2489 set_buffer_uptodate(bh);
2490 unlock_buffer(bh);
2491 reiserfs_write_lock(sb);
2492 reiserfs_prepare_for_journal(sb, bh, 1);
2493 journal_mark_dirty(current->journal_info, bh);
2494 if (!journal_quota)
2495 reiserfs_add_ordered_list(inode, bh);
2496 reiserfs_write_unlock(sb);
2497 brelse(bh);
2498 offset = 0;
2499 towrite -= tocopy;
2500 data += tocopy;
2501 blk++;
2502 }
2503 out:
2504 if (len == towrite)
2505 return err;
2506 if (inode->i_size < off + len - towrite)
2507 i_size_write(inode, off + len - towrite);
2508 inode->i_version++;
2509 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2510 mark_inode_dirty(inode);
2511 return len - towrite;
2512 }
2513
2514 #endif
2515
2516 static struct dentry *get_super_block(struct file_system_type *fs_type,
2517 int flags, const char *dev_name,
2518 void *data)
2519 {
2520 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2521 }
2522
2523 static int __init init_reiserfs_fs(void)
2524 {
2525 int ret;
2526
2527 ret = init_inodecache();
2528 if (ret)
2529 return ret;
2530
2531 reiserfs_proc_info_global_init();
2532
2533 ret = register_filesystem(&reiserfs_fs_type);
2534 if (ret)
2535 goto out;
2536
2537 return 0;
2538 out:
2539 reiserfs_proc_info_global_done();
2540 destroy_inodecache();
2541
2542 return ret;
2543 }
2544
2545 static void __exit exit_reiserfs_fs(void)
2546 {
2547 reiserfs_proc_info_global_done();
2548 unregister_filesystem(&reiserfs_fs_type);
2549 destroy_inodecache();
2550 }
2551
2552 struct file_system_type reiserfs_fs_type = {
2553 .owner = THIS_MODULE,
2554 .name = "reiserfs",
2555 .mount = get_super_block,
2556 .kill_sb = reiserfs_kill_sb,
2557 .fs_flags = FS_REQUIRES_DEV,
2558 };
2559 MODULE_ALIAS_FS("reiserfs");
2560
2561 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2562 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2563 MODULE_LICENSE("GPL");
2564
2565 module_init(init_reiserfs_fs);
2566 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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