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