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ASoC: fsi: reserve prefetch period on DMA transferring
[linux-2.6/btrfs-unstable.git] / fs / reiserfs / super.c
blobe2e202a07b317cff5c84d8b51e3b66efafd689ea
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 void show_alloc_options(struct seq_file *seq, struct super_block *s);
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, s, 1))
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 if (s->s_flags & MS_RDONLY)
105 return;
106
107 spin_lock(&sbi->old_work_lock);
108 if (!sbi->work_queued) {
109 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
110 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
111 sbi->work_queued = 1;
112 }
113 spin_unlock(&sbi->old_work_lock);
114 }
115
116 static void cancel_old_flush(struct super_block *s)
117 {
118 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
119
120 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
121 spin_lock(&sbi->old_work_lock);
122 sbi->work_queued = 0;
123 spin_unlock(&sbi->old_work_lock);
124 }
125
126 static int reiserfs_freeze(struct super_block *s)
127 {
128 struct reiserfs_transaction_handle th;
129
130 cancel_old_flush(s);
131
132 reiserfs_write_lock(s);
133 if (!(s->s_flags & MS_RDONLY)) {
134 int err = journal_begin(&th, s, 1);
135 if (err) {
136 reiserfs_block_writes(&th);
137 } else {
138 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
139 1);
140 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
141 reiserfs_block_writes(&th);
142 journal_end_sync(&th, s, 1);
143 }
144 }
145 reiserfs_write_unlock(s);
146 return 0;
147 }
148
149 static int reiserfs_unfreeze(struct super_block *s)
150 {
151 reiserfs_allow_writes(s);
152 return 0;
153 }
154
155 extern const struct in_core_key MAX_IN_CORE_KEY;
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 static int remove_save_link_only(struct super_block *s,
165 struct reiserfs_key *key, int oid_free)
166 {
167 struct reiserfs_transaction_handle th;
168 int err;
169
170 /* we are going to do one balancing */
171 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
172 if (err)
173 return err;
174
175 reiserfs_delete_solid_item(&th, NULL, key);
176 if (oid_free)
177 /* removals are protected by direct items */
178 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
179
180 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
181 }
182
183 #ifdef CONFIG_QUOTA
184 static int reiserfs_quota_on_mount(struct super_block *, int);
185 #endif
186
187 /* look for uncompleted unlinks and truncates and complete them */
188 static int finish_unfinished(struct super_block *s)
189 {
190 INITIALIZE_PATH(path);
191 struct cpu_key max_cpu_key, obj_key;
192 struct reiserfs_key save_link_key, last_inode_key;
193 int retval = 0;
194 struct item_head *ih;
195 struct buffer_head *bh;
196 int item_pos;
197 char *item;
198 int done;
199 struct inode *inode;
200 int truncate;
201 #ifdef CONFIG_QUOTA
202 int i;
203 int ms_active_set;
204 int quota_enabled[MAXQUOTAS];
205 #endif
206
207 /* compose key to look for "save" links */
208 max_cpu_key.version = KEY_FORMAT_3_5;
209 max_cpu_key.on_disk_key.k_dir_id = ~0U;
210 max_cpu_key.on_disk_key.k_objectid = ~0U;
211 set_cpu_key_k_offset(&max_cpu_key, ~0U);
212 max_cpu_key.key_length = 3;
213
214 memset(&last_inode_key, 0, sizeof(last_inode_key));
215
216 #ifdef CONFIG_QUOTA
217 /* Needed for iput() to work correctly and not trash data */
218 if (s->s_flags & MS_ACTIVE) {
219 ms_active_set = 0;
220 } else {
221 ms_active_set = 1;
222 s->s_flags |= MS_ACTIVE;
223 }
224 /* Turn on quotas so that they are updated correctly */
225 for (i = 0; i < MAXQUOTAS; i++) {
226 quota_enabled[i] = 1;
227 if (REISERFS_SB(s)->s_qf_names[i]) {
228 int ret;
229
230 if (sb_has_quota_active(s, i)) {
231 quota_enabled[i] = 0;
232 continue;
233 }
234 ret = reiserfs_quota_on_mount(s, i);
235 if (ret < 0)
236 reiserfs_warning(s, "reiserfs-2500",
237 "cannot turn on journaled "
238 "quota: error %d", ret);
239 }
240 }
241 #endif
242
243 done = 0;
244 REISERFS_SB(s)->s_is_unlinked_ok = 1;
245 while (!retval) {
246 retval = search_item(s, &max_cpu_key, &path);
247 if (retval != ITEM_NOT_FOUND) {
248 reiserfs_error(s, "vs-2140",
249 "search_by_key returned %d", retval);
250 break;
251 }
252
253 bh = get_last_bh(&path);
254 item_pos = get_item_pos(&path);
255 if (item_pos != B_NR_ITEMS(bh)) {
256 reiserfs_warning(s, "vs-2060",
257 "wrong position found");
258 break;
259 }
260 item_pos--;
261 ih = B_N_PITEM_HEAD(bh, item_pos);
262
263 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
264 /* there are no "save" links anymore */
265 break;
266
267 save_link_key = ih->ih_key;
268 if (is_indirect_le_ih(ih))
269 truncate = 1;
270 else
271 truncate = 0;
272
273 /* reiserfs_iget needs k_dirid and k_objectid only */
274 item = B_I_PITEM(bh, ih);
275 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
276 obj_key.on_disk_key.k_objectid =
277 le32_to_cpu(ih->ih_key.k_objectid);
278 obj_key.on_disk_key.k_offset = 0;
279 obj_key.on_disk_key.k_type = 0;
280
281 pathrelse(&path);
282
283 inode = reiserfs_iget(s, &obj_key);
284 if (!inode) {
285 /* the unlink almost completed, it just did not manage to remove
286 "save" link and release objectid */
287 reiserfs_warning(s, "vs-2180", "iget failed for %K",
288 &obj_key);
289 retval = remove_save_link_only(s, &save_link_key, 1);
290 continue;
291 }
292
293 if (!truncate && inode->i_nlink) {
294 /* file is not unlinked */
295 reiserfs_warning(s, "vs-2185",
296 "file %K is not unlinked",
297 &obj_key);
298 retval = remove_save_link_only(s, &save_link_key, 0);
299 continue;
300 }
301 reiserfs_write_unlock(s);
302 dquot_initialize(inode);
303 reiserfs_write_lock(s);
304
305 if (truncate && S_ISDIR(inode->i_mode)) {
306 /* We got a truncate request for a dir which is impossible.
307 The only imaginable way is to execute unfinished truncate request
308 then boot into old kernel, remove the file and create dir with
309 the same key. */
310 reiserfs_warning(s, "green-2101",
311 "impossible truncate on a "
312 "directory %k. Please report",
313 INODE_PKEY(inode));
314 retval = remove_save_link_only(s, &save_link_key, 0);
315 truncate = 0;
316 iput(inode);
317 continue;
318 }
319
320 if (truncate) {
321 REISERFS_I(inode)->i_flags |=
322 i_link_saved_truncate_mask;
323 /* not completed truncate found. New size was committed together
324 with "save" link */
325 reiserfs_info(s, "Truncating %k to %Ld ..",
326 INODE_PKEY(inode), inode->i_size);
327 reiserfs_truncate_file(inode,
328 0
329 /*don't update modification time */
330 );
331 retval = remove_save_link(inode, truncate);
332 } else {
333 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
334 /* not completed unlink (rmdir) found */
335 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
336 if (memcmp(&last_inode_key, INODE_PKEY(inode),
337 sizeof(last_inode_key))){
338 last_inode_key = *INODE_PKEY(inode);
339 /* removal gets completed in iput */
340 retval = 0;
341 } else {
342 reiserfs_warning(s, "super-2189", "Dead loop "
343 "in finish_unfinished "
344 "detected, just remove "
345 "save link\n");
346 retval = remove_save_link_only(s,
347 &save_link_key, 0);
348 }
349 }
350
351 iput(inode);
352 printk("done\n");
353 done++;
354 }
355 REISERFS_SB(s)->s_is_unlinked_ok = 0;
356
357 #ifdef CONFIG_QUOTA
358 /* Turn quotas off */
359 for (i = 0; i < MAXQUOTAS; i++) {
360 if (sb_dqopt(s)->files[i] && quota_enabled[i])
361 dquot_quota_off(s, i);
362 }
363 if (ms_active_set)
364 /* Restore the flag back */
365 s->s_flags &= ~MS_ACTIVE;
366 #endif
367 pathrelse(&path);
368 if (done)
369 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
370 "Completed\n", done);
371 return retval;
372 }
373
374 /* to protect file being unlinked from getting lost we "safe" link files
375 being unlinked. This link will be deleted in the same transaction with last
376 item of file. mounting the filesystem we scan all these links and remove
377 files which almost got lost */
378 void add_save_link(struct reiserfs_transaction_handle *th,
379 struct inode *inode, int truncate)
380 {
381 INITIALIZE_PATH(path);
382 int retval;
383 struct cpu_key key;
384 struct item_head ih;
385 __le32 link;
386
387 BUG_ON(!th->t_trans_id);
388
389 /* file can only get one "save link" of each kind */
390 RFALSE(truncate &&
391 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
392 "saved link already exists for truncated inode %lx",
393 (long)inode->i_ino);
394 RFALSE(!truncate &&
395 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
396 "saved link already exists for unlinked inode %lx",
397 (long)inode->i_ino);
398
399 /* setup key of "save" link */
400 key.version = KEY_FORMAT_3_5;
401 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
402 key.on_disk_key.k_objectid = inode->i_ino;
403 if (!truncate) {
404 /* unlink, rmdir, rename */
405 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
406 set_cpu_key_k_type(&key, TYPE_DIRECT);
407
408 /* item head of "safe" link */
409 make_le_item_head(&ih, &key, key.version,
410 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
411 4 /*length */ , 0xffff /*free space */ );
412 } else {
413 /* truncate */
414 if (S_ISDIR(inode->i_mode))
415 reiserfs_warning(inode->i_sb, "green-2102",
416 "Adding a truncate savelink for "
417 "a directory %k! Please report",
418 INODE_PKEY(inode));
419 set_cpu_key_k_offset(&key, 1);
420 set_cpu_key_k_type(&key, TYPE_INDIRECT);
421
422 /* item head of "safe" link */
423 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
424 4 /*length */ , 0 /*free space */ );
425 }
426 key.key_length = 3;
427
428 /* look for its place in the tree */
429 retval = search_item(inode->i_sb, &key, &path);
430 if (retval != ITEM_NOT_FOUND) {
431 if (retval != -ENOSPC)
432 reiserfs_error(inode->i_sb, "vs-2100",
433 "search_by_key (%K) returned %d", &key,
434 retval);
435 pathrelse(&path);
436 return;
437 }
438
439 /* body of "save" link */
440 link = INODE_PKEY(inode)->k_dir_id;
441
442 /* put "save" link into tree, don't charge quota to anyone */
443 retval =
444 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
445 if (retval) {
446 if (retval != -ENOSPC)
447 reiserfs_error(inode->i_sb, "vs-2120",
448 "insert_item returned %d", retval);
449 } else {
450 if (truncate)
451 REISERFS_I(inode)->i_flags |=
452 i_link_saved_truncate_mask;
453 else
454 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
455 }
456 }
457
458 /* this opens transaction unlike add_save_link */
459 int remove_save_link(struct inode *inode, int truncate)
460 {
461 struct reiserfs_transaction_handle th;
462 struct reiserfs_key key;
463 int err;
464
465 /* we are going to do one balancing only */
466 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
467 if (err)
468 return err;
469
470 /* setup key of "save" link */
471 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
472 key.k_objectid = INODE_PKEY(inode)->k_objectid;
473 if (!truncate) {
474 /* unlink, rmdir, rename */
475 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
476 1 + inode->i_sb->s_blocksize);
477 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
478 } else {
479 /* truncate */
480 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
481 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
482 }
483
484 if ((truncate &&
485 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
486 (!truncate &&
487 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
488 /* don't take quota bytes from anywhere */
489 reiserfs_delete_solid_item(&th, NULL, &key);
490 if (!truncate) {
491 reiserfs_release_objectid(&th, inode->i_ino);
492 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
493 } else
494 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
495
496 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
497 }
498
499 static void reiserfs_kill_sb(struct super_block *s)
500 {
501 if (REISERFS_SB(s)) {
502 reiserfs_proc_info_done(s);
503 /*
504 * Force any pending inode evictions to occur now. Any
505 * inodes to be removed that have extended attributes
506 * associated with them need to clean them up before
507 * we can release the extended attribute root dentries.
508 * shrink_dcache_for_umount will BUG if we don't release
509 * those before it's called so ->put_super is too late.
510 */
511 shrink_dcache_sb(s);
512
513 dput(REISERFS_SB(s)->xattr_root);
514 REISERFS_SB(s)->xattr_root = NULL;
515 dput(REISERFS_SB(s)->priv_root);
516 REISERFS_SB(s)->priv_root = NULL;
517 }
518
519 kill_block_super(s);
520 }
521
522 static void reiserfs_put_super(struct super_block *s)
523 {
524 struct reiserfs_transaction_handle th;
525 th.t_trans_id = 0;
526
527 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
528
529 reiserfs_write_lock(s);
530
531 /* change file system state to current state if it was mounted with read-write permissions */
532 if (!(s->s_flags & MS_RDONLY)) {
533 if (!journal_begin(&th, s, 10)) {
534 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
535 1);
536 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
537 REISERFS_SB(s)->s_mount_state);
538 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
539 }
540 }
541
542 /* note, journal_release checks for readonly mount, and can decide not
543 ** to do a journal_end
544 */
545 journal_release(&th, s);
546
547 reiserfs_free_bitmap_cache(s);
548
549 brelse(SB_BUFFER_WITH_SB(s));
550
551 print_statistics(s);
552
553 if (REISERFS_SB(s)->reserved_blocks != 0) {
554 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
555 REISERFS_SB(s)->reserved_blocks);
556 }
557
558 reiserfs_write_unlock(s);
559 mutex_destroy(&REISERFS_SB(s)->lock);
560 kfree(s->s_fs_info);
561 s->s_fs_info = NULL;
562 }
563
564 static struct kmem_cache *reiserfs_inode_cachep;
565
566 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
567 {
568 struct reiserfs_inode_info *ei;
569 ei = (struct reiserfs_inode_info *)
570 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
571 if (!ei)
572 return NULL;
573 atomic_set(&ei->openers, 0);
574 mutex_init(&ei->tailpack);
575 return &ei->vfs_inode;
576 }
577
578 static void reiserfs_i_callback(struct rcu_head *head)
579 {
580 struct inode *inode = container_of(head, struct inode, i_rcu);
581 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
582 }
583
584 static void reiserfs_destroy_inode(struct inode *inode)
585 {
586 call_rcu(&inode->i_rcu, reiserfs_i_callback);
587 }
588
589 static void init_once(void *foo)
590 {
591 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
592
593 INIT_LIST_HEAD(&ei->i_prealloc_list);
594 inode_init_once(&ei->vfs_inode);
595 }
596
597 static int init_inodecache(void)
598 {
599 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
600 sizeof(struct
601 reiserfs_inode_info),
602 0, (SLAB_RECLAIM_ACCOUNT|
603 SLAB_MEM_SPREAD),
604 init_once);
605 if (reiserfs_inode_cachep == NULL)
606 return -ENOMEM;
607 return 0;
608 }
609
610 static void destroy_inodecache(void)
611 {
612 /*
613 * Make sure all delayed rcu free inodes are flushed before we
614 * destroy cache.
615 */
616 rcu_barrier();
617 kmem_cache_destroy(reiserfs_inode_cachep);
618 }
619
620 /* we don't mark inodes dirty, we just log them */
621 static void reiserfs_dirty_inode(struct inode *inode, int flags)
622 {
623 struct reiserfs_transaction_handle th;
624
625 int err = 0;
626 int lock_depth;
627
628 if (inode->i_sb->s_flags & MS_RDONLY) {
629 reiserfs_warning(inode->i_sb, "clm-6006",
630 "writing inode %lu on readonly FS",
631 inode->i_ino);
632 return;
633 }
634 lock_depth = reiserfs_write_lock_once(inode->i_sb);
635
636 /* this is really only used for atime updates, so they don't have
637 ** to be included in O_SYNC or fsync
638 */
639 err = journal_begin(&th, inode->i_sb, 1);
640 if (err)
641 goto out;
642
643 reiserfs_update_sd(&th, inode);
644 journal_end(&th, inode->i_sb, 1);
645
646 out:
647 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
648 }
649
650 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
651 {
652 struct super_block *s = root->d_sb;
653 struct reiserfs_journal *journal = SB_JOURNAL(s);
654 long opts = REISERFS_SB(s)->s_mount_opt;
655
656 if (opts & (1 << REISERFS_LARGETAIL))
657 seq_puts(seq, ",tails=on");
658 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
659 seq_puts(seq, ",notail");
660 /* tails=small is default so we don't show it */
661
662 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
663 seq_puts(seq, ",barrier=none");
664 /* barrier=flush is default so we don't show it */
665
666 if (opts & (1 << REISERFS_ERROR_CONTINUE))
667 seq_puts(seq, ",errors=continue");
668 else if (opts & (1 << REISERFS_ERROR_PANIC))
669 seq_puts(seq, ",errors=panic");
670 /* errors=ro is default so we don't show it */
671
672 if (opts & (1 << REISERFS_DATA_LOG))
673 seq_puts(seq, ",data=journal");
674 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
675 seq_puts(seq, ",data=writeback");
676 /* data=ordered is default so we don't show it */
677
678 if (opts & (1 << REISERFS_ATTRS))
679 seq_puts(seq, ",attrs");
680
681 if (opts & (1 << REISERFS_XATTRS_USER))
682 seq_puts(seq, ",user_xattr");
683
684 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
685 seq_puts(seq, ",expose_privroot");
686
687 if (opts & (1 << REISERFS_POSIXACL))
688 seq_puts(seq, ",acl");
689
690 if (REISERFS_SB(s)->s_jdev)
691 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
692
693 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
694 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
695
696 #ifdef CONFIG_QUOTA
697 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
698 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
699 else if (opts & (1 << REISERFS_USRQUOTA))
700 seq_puts(seq, ",usrquota");
701 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
702 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
703 else if (opts & (1 << REISERFS_GRPQUOTA))
704 seq_puts(seq, ",grpquota");
705 if (REISERFS_SB(s)->s_jquota_fmt) {
706 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
707 seq_puts(seq, ",jqfmt=vfsold");
708 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
709 seq_puts(seq, ",jqfmt=vfsv0");
710 }
711 #endif
712
713 /* Block allocator options */
714 if (opts & (1 << REISERFS_NO_BORDER))
715 seq_puts(seq, ",block-allocator=noborder");
716 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
717 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
718 if (opts & (1 << REISERFS_HASHED_RELOCATION))
719 seq_puts(seq, ",block-allocator=hashed_relocation");
720 if (opts & (1 << REISERFS_TEST4))
721 seq_puts(seq, ",block-allocator=test4");
722 show_alloc_options(seq, s);
723 return 0;
724 }
725
726 #ifdef CONFIG_QUOTA
727 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
728 size_t, loff_t);
729 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
730 loff_t);
731 #endif
732
733 static const struct super_operations reiserfs_sops = {
734 .alloc_inode = reiserfs_alloc_inode,
735 .destroy_inode = reiserfs_destroy_inode,
736 .write_inode = reiserfs_write_inode,
737 .dirty_inode = reiserfs_dirty_inode,
738 .evict_inode = reiserfs_evict_inode,
739 .put_super = reiserfs_put_super,
740 .sync_fs = reiserfs_sync_fs,
741 .freeze_fs = reiserfs_freeze,
742 .unfreeze_fs = reiserfs_unfreeze,
743 .statfs = reiserfs_statfs,
744 .remount_fs = reiserfs_remount,
745 .show_options = reiserfs_show_options,
746 #ifdef CONFIG_QUOTA
747 .quota_read = reiserfs_quota_read,
748 .quota_write = reiserfs_quota_write,
749 #endif
750 };
751
752 #ifdef CONFIG_QUOTA
753 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
754
755 static int reiserfs_write_dquot(struct dquot *);
756 static int reiserfs_acquire_dquot(struct dquot *);
757 static int reiserfs_release_dquot(struct dquot *);
758 static int reiserfs_mark_dquot_dirty(struct dquot *);
759 static int reiserfs_write_info(struct super_block *, int);
760 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
761
762 static const struct dquot_operations reiserfs_quota_operations = {
763 .write_dquot = reiserfs_write_dquot,
764 .acquire_dquot = reiserfs_acquire_dquot,
765 .release_dquot = reiserfs_release_dquot,
766 .mark_dirty = reiserfs_mark_dquot_dirty,
767 .write_info = reiserfs_write_info,
768 .alloc_dquot = dquot_alloc,
769 .destroy_dquot = dquot_destroy,
770 };
771
772 static const struct quotactl_ops reiserfs_qctl_operations = {
773 .quota_on = reiserfs_quota_on,
774 .quota_off = dquot_quota_off,
775 .quota_sync = dquot_quota_sync,
776 .get_info = dquot_get_dqinfo,
777 .set_info = dquot_set_dqinfo,
778 .get_dqblk = dquot_get_dqblk,
779 .set_dqblk = dquot_set_dqblk,
780 };
781 #endif
782
783 static const struct export_operations reiserfs_export_ops = {
784 .encode_fh = reiserfs_encode_fh,
785 .fh_to_dentry = reiserfs_fh_to_dentry,
786 .fh_to_parent = reiserfs_fh_to_parent,
787 .get_parent = reiserfs_get_parent,
788 };
789
790 /* this struct is used in reiserfs_getopt () for containing the value for those
791 mount options that have values rather than being toggles. */
792 typedef struct {
793 char *value;
794 int setmask; /* bitmask which is to set on mount_options bitmask when this
795 value is found, 0 is no bits are to be changed. */
796 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
797 value is found, 0 is no bits are to be changed. This is
798 applied BEFORE setmask */
799 } arg_desc_t;
800
801 /* Set this bit in arg_required to allow empty arguments */
802 #define REISERFS_OPT_ALLOWEMPTY 31
803
804 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
805 mount options */
806 typedef struct {
807 char *option_name;
808 int arg_required; /* 0 if argument is not required, not 0 otherwise */
809 const arg_desc_t *values; /* list of values accepted by an option */
810 int setmask; /* bitmask which is to set on mount_options bitmask when this
811 value is found, 0 is no bits are to be changed. */
812 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
813 value is found, 0 is no bits are to be changed. This is
814 applied BEFORE setmask */
815 } opt_desc_t;
816
817 /* possible values for -o data= */
818 static const arg_desc_t logging_mode[] = {
819 {"ordered", 1 << REISERFS_DATA_ORDERED,
820 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
821 {"journal", 1 << REISERFS_DATA_LOG,
822 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
823 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
824 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
825 {.value = NULL}
826 };
827
828 /* possible values for -o barrier= */
829 static const arg_desc_t barrier_mode[] = {
830 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
831 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
832 {.value = NULL}
833 };
834
835 /* possible values for "-o block-allocator=" and bits which are to be set in
836 s_mount_opt of reiserfs specific part of in-core super block */
837 static const arg_desc_t balloc[] = {
838 {"noborder", 1 << REISERFS_NO_BORDER, 0},
839 {"border", 0, 1 << REISERFS_NO_BORDER},
840 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
841 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
842 {"test4", 1 << REISERFS_TEST4, 0},
843 {"notest4", 0, 1 << REISERFS_TEST4},
844 {NULL, 0, 0}
845 };
846
847 static const arg_desc_t tails[] = {
848 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
849 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
850 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
851 {NULL, 0, 0}
852 };
853
854 static const arg_desc_t error_actions[] = {
855 {"panic", 1 << REISERFS_ERROR_PANIC,
856 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
857 {"ro-remount", 1 << REISERFS_ERROR_RO,
858 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
859 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
860 {"continue", 1 << REISERFS_ERROR_CONTINUE,
861 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
862 #endif
863 {NULL, 0, 0},
864 };
865
866 /* proceed only one option from a list *cur - string containing of mount options
867 opts - array of options which are accepted
868 opt_arg - if option is found and requires an argument and if it is specifed
869 in the input - pointer to the argument is stored here
870 bit_flags - if option requires to set a certain bit - it is set here
871 return -1 if unknown option is found, opt->arg_required otherwise */
872 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
873 char **opt_arg, unsigned long *bit_flags)
874 {
875 char *p;
876 /* foo=bar,
877 ^ ^ ^
878 | | +-- option_end
879 | +-- arg_start
880 +-- option_start
881 */
882 const opt_desc_t *opt;
883 const arg_desc_t *arg;
884
885 p = *cur;
886
887 /* assume argument cannot contain commas */
888 *cur = strchr(p, ',');
889 if (*cur) {
890 *(*cur) = '\0';
891 (*cur)++;
892 }
893
894 if (!strncmp(p, "alloc=", 6)) {
895 /* Ugly special case, probably we should redo options parser so that
896 it can understand several arguments for some options, also so that
897 it can fill several bitfields with option values. */
898 if (reiserfs_parse_alloc_options(s, p + 6)) {
899 return -1;
900 } else {
901 return 0;
902 }
903 }
904
905 /* for every option in the list */
906 for (opt = opts; opt->option_name; opt++) {
907 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
908 if (bit_flags) {
909 if (opt->clrmask ==
910 (1 << REISERFS_UNSUPPORTED_OPT))
911 reiserfs_warning(s, "super-6500",
912 "%s not supported.\n",
913 p);
914 else
915 *bit_flags &= ~opt->clrmask;
916 if (opt->setmask ==
917 (1 << REISERFS_UNSUPPORTED_OPT))
918 reiserfs_warning(s, "super-6501",
919 "%s not supported.\n",
920 p);
921 else
922 *bit_flags |= opt->setmask;
923 }
924 break;
925 }
926 }
927 if (!opt->option_name) {
928 reiserfs_warning(s, "super-6502",
929 "unknown mount option \"%s\"", p);
930 return -1;
931 }
932
933 p += strlen(opt->option_name);
934 switch (*p) {
935 case '=':
936 if (!opt->arg_required) {
937 reiserfs_warning(s, "super-6503",
938 "the option \"%s\" does not "
939 "require an argument\n",
940 opt->option_name);
941 return -1;
942 }
943 break;
944
945 case 0:
946 if (opt->arg_required) {
947 reiserfs_warning(s, "super-6504",
948 "the option \"%s\" requires an "
949 "argument\n", opt->option_name);
950 return -1;
951 }
952 break;
953 default:
954 reiserfs_warning(s, "super-6505",
955 "head of option \"%s\" is only correct\n",
956 opt->option_name);
957 return -1;
958 }
959
960 /* move to the argument, or to next option if argument is not required */
961 p++;
962
963 if (opt->arg_required
964 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
965 && !strlen(p)) {
966 /* this catches "option=," if not allowed */
967 reiserfs_warning(s, "super-6506",
968 "empty argument for \"%s\"\n",
969 opt->option_name);
970 return -1;
971 }
972
973 if (!opt->values) {
974 /* *=NULLopt_arg contains pointer to argument */
975 *opt_arg = p;
976 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
977 }
978
979 /* values possible for this option are listed in opt->values */
980 for (arg = opt->values; arg->value; arg++) {
981 if (!strcmp(p, arg->value)) {
982 if (bit_flags) {
983 *bit_flags &= ~arg->clrmask;
984 *bit_flags |= arg->setmask;
985 }
986 return opt->arg_required;
987 }
988 }
989
990 reiserfs_warning(s, "super-6506",
991 "bad value \"%s\" for option \"%s\"\n", p,
992 opt->option_name);
993 return -1;
994 }
995
996 /* returns 0 if something is wrong in option string, 1 - otherwise */
997 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
998 unsigned long *mount_options,
999 /* after the parsing phase, contains the
1000 collection of bitflags defining what
1001 mount options were selected. */
1002 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
1003 char **jdev_name,
1004 unsigned int *commit_max_age,
1005 char **qf_names,
1006 unsigned int *qfmt)
1007 {
1008 int c;
1009 char *arg = NULL;
1010 char *pos;
1011 opt_desc_t opts[] = {
1012 /* Compatibility stuff, so that -o notail for old setups still work */
1013 {"tails",.arg_required = 't',.values = tails},
1014 {"notail",.clrmask =
1015 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1016 {"conv",.setmask = 1 << REISERFS_CONVERT},
1017 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1018 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1019 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1020 #ifdef CONFIG_REISERFS_FS_XATTR
1021 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1022 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1023 #else
1024 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1025 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026 #endif
1027 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1028 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1029 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1030 #else
1031 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1032 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033 #endif
1034 {.option_name = "nolog"},
1035 {"replayonly",.setmask = 1 << REPLAYONLY},
1036 {"block-allocator",.arg_required = 'a',.values = balloc},
1037 {"data",.arg_required = 'd',.values = logging_mode},
1038 {"barrier",.arg_required = 'b',.values = barrier_mode},
1039 {"resize",.arg_required = 'r',.values = NULL},
1040 {"jdev",.arg_required = 'j',.values = NULL},
1041 {"nolargeio",.arg_required = 'w',.values = NULL},
1042 {"commit",.arg_required = 'c',.values = NULL},
1043 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1044 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1045 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1046 {"errors",.arg_required = 'e',.values = error_actions},
1047 {"usrjquota",.arg_required =
1048 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1049 {"grpjquota",.arg_required =
1050 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1051 {"jqfmt",.arg_required = 'f',.values = NULL},
1052 {.option_name = NULL}
1053 };
1054
1055 *blocks = 0;
1056 if (!options || !*options)
1057 /* use default configuration: create tails, journaling on, no
1058 conversion to newest format */
1059 return 1;
1060
1061 for (pos = options; pos;) {
1062 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1063 if (c == -1)
1064 /* wrong option is given */
1065 return 0;
1066
1067 if (c == 'r') {
1068 char *p;
1069
1070 p = NULL;
1071 /* "resize=NNN" or "resize=auto" */
1072
1073 if (!strcmp(arg, "auto")) {
1074 /* From JFS code, to auto-get the size. */
1075 *blocks =
1076 s->s_bdev->bd_inode->i_size >> s->
1077 s_blocksize_bits;
1078 } else {
1079 *blocks = simple_strtoul(arg, &p, 0);
1080 if (*p != '\0') {
1081 /* NNN does not look like a number */
1082 reiserfs_warning(s, "super-6507",
1083 "bad value %s for "
1084 "-oresize\n", arg);
1085 return 0;
1086 }
1087 }
1088 }
1089
1090 if (c == 'c') {
1091 char *p = NULL;
1092 unsigned long val = simple_strtoul(arg, &p, 0);
1093 /* commit=NNN (time in seconds) */
1094 if (*p != '\0' || val >= (unsigned int)-1) {
1095 reiserfs_warning(s, "super-6508",
1096 "bad value %s for -ocommit\n",
1097 arg);
1098 return 0;
1099 }
1100 *commit_max_age = (unsigned int)val;
1101 }
1102
1103 if (c == 'w') {
1104 reiserfs_warning(s, "super-6509", "nolargeio option "
1105 "is no longer supported");
1106 return 0;
1107 }
1108
1109 if (c == 'j') {
1110 if (arg && *arg && jdev_name) {
1111 if (*jdev_name) { //Hm, already assigned?
1112 reiserfs_warning(s, "super-6510",
1113 "journal device was "
1114 "already specified to "
1115 "be %s", *jdev_name);
1116 return 0;
1117 }
1118 *jdev_name = arg;
1119 }
1120 }
1121 #ifdef CONFIG_QUOTA
1122 if (c == 'u' || c == 'g') {
1123 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1124
1125 if (sb_any_quota_loaded(s) &&
1126 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1127 reiserfs_warning(s, "super-6511",
1128 "cannot change journaled "
1129 "quota options when quota "
1130 "turned on.");
1131 return 0;
1132 }
1133 if (*arg) { /* Some filename specified? */
1134 if (REISERFS_SB(s)->s_qf_names[qtype]
1135 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1136 arg)) {
1137 reiserfs_warning(s, "super-6512",
1138 "%s quota file "
1139 "already specified.",
1140 QTYPE2NAME(qtype));
1141 return 0;
1142 }
1143 if (strchr(arg, '/')) {
1144 reiserfs_warning(s, "super-6513",
1145 "quotafile must be "
1146 "on filesystem root.");
1147 return 0;
1148 }
1149 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1150 if (!qf_names[qtype]) {
1151 reiserfs_warning(s, "reiserfs-2502",
1152 "not enough memory "
1153 "for storing "
1154 "quotafile name.");
1155 return 0;
1156 }
1157 if (qtype == USRQUOTA)
1158 *mount_options |= 1 << REISERFS_USRQUOTA;
1159 else
1160 *mount_options |= 1 << REISERFS_GRPQUOTA;
1161 } else {
1162 if (qf_names[qtype] !=
1163 REISERFS_SB(s)->s_qf_names[qtype])
1164 kfree(qf_names[qtype]);
1165 qf_names[qtype] = NULL;
1166 if (qtype == USRQUOTA)
1167 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1168 else
1169 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1170 }
1171 }
1172 if (c == 'f') {
1173 if (!strcmp(arg, "vfsold"))
1174 *qfmt = QFMT_VFS_OLD;
1175 else if (!strcmp(arg, "vfsv0"))
1176 *qfmt = QFMT_VFS_V0;
1177 else {
1178 reiserfs_warning(s, "super-6514",
1179 "unknown quota format "
1180 "specified.");
1181 return 0;
1182 }
1183 if (sb_any_quota_loaded(s) &&
1184 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1185 reiserfs_warning(s, "super-6515",
1186 "cannot change journaled "
1187 "quota options when quota "
1188 "turned on.");
1189 return 0;
1190 }
1191 }
1192 #else
1193 if (c == 'u' || c == 'g' || c == 'f') {
1194 reiserfs_warning(s, "reiserfs-2503", "journaled "
1195 "quota options not supported.");
1196 return 0;
1197 }
1198 #endif
1199 }
1200
1201 #ifdef CONFIG_QUOTA
1202 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1203 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1204 reiserfs_warning(s, "super-6515",
1205 "journaled quota format not specified.");
1206 return 0;
1207 }
1208 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1209 sb_has_quota_loaded(s, USRQUOTA)) ||
1210 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1211 sb_has_quota_loaded(s, GRPQUOTA))) {
1212 reiserfs_warning(s, "super-6516", "quota options must "
1213 "be present when quota is turned on.");
1214 return 0;
1215 }
1216 #endif
1217
1218 return 1;
1219 }
1220
1221 static void switch_data_mode(struct super_block *s, unsigned long mode)
1222 {
1223 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1224 (1 << REISERFS_DATA_ORDERED) |
1225 (1 << REISERFS_DATA_WRITEBACK));
1226 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1227 }
1228
1229 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1230 {
1231 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1232 if (!reiserfs_data_log(s)) {
1233 switch_data_mode(s, REISERFS_DATA_LOG);
1234 reiserfs_info(s, "switching to journaled data mode\n");
1235 }
1236 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1237 if (!reiserfs_data_ordered(s)) {
1238 switch_data_mode(s, REISERFS_DATA_ORDERED);
1239 reiserfs_info(s, "switching to ordered data mode\n");
1240 }
1241 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1242 if (!reiserfs_data_writeback(s)) {
1243 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1244 reiserfs_info(s, "switching to writeback data mode\n");
1245 }
1246 }
1247 }
1248
1249 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1250 {
1251 int flush = (1 << REISERFS_BARRIER_FLUSH);
1252 int none = (1 << REISERFS_BARRIER_NONE);
1253 int all_barrier = flush | none;
1254
1255 if (bits & all_barrier) {
1256 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1257 if (bits & flush) {
1258 REISERFS_SB(s)->s_mount_opt |= flush;
1259 printk("reiserfs: enabling write barrier flush mode\n");
1260 } else if (bits & none) {
1261 REISERFS_SB(s)->s_mount_opt |= none;
1262 printk("reiserfs: write barriers turned off\n");
1263 }
1264 }
1265 }
1266
1267 static void handle_attrs(struct super_block *s)
1268 {
1269 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1270
1271 if (reiserfs_attrs(s)) {
1272 if (old_format_only(s)) {
1273 reiserfs_warning(s, "super-6517", "cannot support "
1274 "attributes on 3.5.x disk format");
1275 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1276 return;
1277 }
1278 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1279 reiserfs_warning(s, "super-6518", "cannot support "
1280 "attributes until flag is set in "
1281 "super-block");
1282 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1283 }
1284 }
1285 }
1286
1287 #ifdef CONFIG_QUOTA
1288 static void handle_quota_files(struct super_block *s, char **qf_names,
1289 unsigned int *qfmt)
1290 {
1291 int i;
1292
1293 for (i = 0; i < MAXQUOTAS; i++) {
1294 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1295 kfree(REISERFS_SB(s)->s_qf_names[i]);
1296 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1297 }
1298 if (*qfmt)
1299 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1300 }
1301 #endif
1302
1303 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1304 {
1305 struct reiserfs_super_block *rs;
1306 struct reiserfs_transaction_handle th;
1307 unsigned long blocks;
1308 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1309 unsigned long safe_mask = 0;
1310 unsigned int commit_max_age = (unsigned int)-1;
1311 struct reiserfs_journal *journal = SB_JOURNAL(s);
1312 char *new_opts = kstrdup(arg, GFP_KERNEL);
1313 int err;
1314 char *qf_names[MAXQUOTAS];
1315 unsigned int qfmt = 0;
1316 #ifdef CONFIG_QUOTA
1317 int i;
1318 #endif
1319
1320 reiserfs_write_lock(s);
1321
1322 #ifdef CONFIG_QUOTA
1323 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1324 #endif
1325
1326 rs = SB_DISK_SUPER_BLOCK(s);
1327
1328 if (!reiserfs_parse_options
1329 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1330 qf_names, &qfmt)) {
1331 #ifdef CONFIG_QUOTA
1332 for (i = 0; i < MAXQUOTAS; i++)
1333 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1334 kfree(qf_names[i]);
1335 #endif
1336 err = -EINVAL;
1337 goto out_unlock;
1338 }
1339 #ifdef CONFIG_QUOTA
1340 handle_quota_files(s, qf_names, &qfmt);
1341 #endif
1342
1343 handle_attrs(s);
1344
1345 /* Add options that are safe here */
1346 safe_mask |= 1 << REISERFS_SMALLTAIL;
1347 safe_mask |= 1 << REISERFS_LARGETAIL;
1348 safe_mask |= 1 << REISERFS_NO_BORDER;
1349 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1350 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1351 safe_mask |= 1 << REISERFS_TEST4;
1352 safe_mask |= 1 << REISERFS_ATTRS;
1353 safe_mask |= 1 << REISERFS_XATTRS_USER;
1354 safe_mask |= 1 << REISERFS_POSIXACL;
1355 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1356 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1357 safe_mask |= 1 << REISERFS_ERROR_RO;
1358 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1359 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1360 safe_mask |= 1 << REISERFS_USRQUOTA;
1361 safe_mask |= 1 << REISERFS_GRPQUOTA;
1362
1363 /* Update the bitmask, taking care to keep
1364 * the bits we're not allowed to change here */
1365 REISERFS_SB(s)->s_mount_opt =
1366 (REISERFS_SB(s)->
1367 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1368
1369 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1370 journal->j_max_commit_age = commit_max_age;
1371 journal->j_max_trans_age = commit_max_age;
1372 } else if (commit_max_age == 0) {
1373 /* 0 means restore defaults. */
1374 journal->j_max_commit_age = journal->j_default_max_commit_age;
1375 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1376 }
1377
1378 if (blocks) {
1379 err = reiserfs_resize(s, blocks);
1380 if (err != 0)
1381 goto out_unlock;
1382 }
1383
1384 if (*mount_flags & MS_RDONLY) {
1385 reiserfs_xattr_init(s, *mount_flags);
1386 /* remount read-only */
1387 if (s->s_flags & MS_RDONLY)
1388 /* it is read-only already */
1389 goto out_ok;
1390
1391 /*
1392 * Drop write lock. Quota will retake it when needed and lock
1393 * ordering requires calling dquot_suspend() without it.
1394 */
1395 reiserfs_write_unlock(s);
1396 err = dquot_suspend(s, -1);
1397 if (err < 0)
1398 goto out_err;
1399 reiserfs_write_lock(s);
1400
1401 /* try to remount file system with read-only permissions */
1402 if (sb_umount_state(rs) == REISERFS_VALID_FS
1403 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1404 goto out_ok;
1405 }
1406
1407 err = journal_begin(&th, s, 10);
1408 if (err)
1409 goto out_unlock;
1410
1411 /* Mounting a rw partition read-only. */
1412 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1413 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1414 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1415 } else {
1416 /* remount read-write */
1417 if (!(s->s_flags & MS_RDONLY)) {
1418 reiserfs_xattr_init(s, *mount_flags);
1419 goto out_ok; /* We are read-write already */
1420 }
1421
1422 if (reiserfs_is_journal_aborted(journal)) {
1423 err = journal->j_errno;
1424 goto out_unlock;
1425 }
1426
1427 handle_data_mode(s, mount_options);
1428 handle_barrier_mode(s, mount_options);
1429 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1430 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1431 err = journal_begin(&th, s, 10);
1432 if (err)
1433 goto out_unlock;
1434
1435 /* Mount a partition which is read-only, read-write */
1436 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1437 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1438 s->s_flags &= ~MS_RDONLY;
1439 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1440 if (!old_format_only(s))
1441 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1442 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1443 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1444 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1445 }
1446 /* this will force a full flush of all journal lists */
1447 SB_JOURNAL(s)->j_must_wait = 1;
1448 err = journal_end(&th, s, 10);
1449 if (err)
1450 goto out_unlock;
1451
1452 if (!(*mount_flags & MS_RDONLY)) {
1453 /*
1454 * Drop write lock. Quota will retake it when needed and lock
1455 * ordering requires calling dquot_resume() without it.
1456 */
1457 reiserfs_write_unlock(s);
1458 dquot_resume(s, -1);
1459 reiserfs_write_lock(s);
1460 finish_unfinished(s);
1461 reiserfs_xattr_init(s, *mount_flags);
1462 }
1463
1464 out_ok:
1465 replace_mount_options(s, new_opts);
1466 reiserfs_write_unlock(s);
1467 return 0;
1468
1469 out_unlock:
1470 reiserfs_write_unlock(s);
1471 out_err:
1472 kfree(new_opts);
1473 return err;
1474 }
1475
1476 static int read_super_block(struct super_block *s, int offset)
1477 {
1478 struct buffer_head *bh;
1479 struct reiserfs_super_block *rs;
1480 int fs_blocksize;
1481
1482 bh = sb_bread(s, offset / s->s_blocksize);
1483 if (!bh) {
1484 reiserfs_warning(s, "sh-2006",
1485 "bread failed (dev %s, block %lu, size %lu)",
1486 reiserfs_bdevname(s), offset / s->s_blocksize,
1487 s->s_blocksize);
1488 return 1;
1489 }
1490
1491 rs = (struct reiserfs_super_block *)bh->b_data;
1492 if (!is_any_reiserfs_magic_string(rs)) {
1493 brelse(bh);
1494 return 1;
1495 }
1496 //
1497 // ok, reiserfs signature (old or new) found in at the given offset
1498 //
1499 fs_blocksize = sb_blocksize(rs);
1500 brelse(bh);
1501 sb_set_blocksize(s, fs_blocksize);
1502
1503 bh = sb_bread(s, offset / s->s_blocksize);
1504 if (!bh) {
1505 reiserfs_warning(s, "sh-2007",
1506 "bread failed (dev %s, block %lu, size %lu)",
1507 reiserfs_bdevname(s), offset / s->s_blocksize,
1508 s->s_blocksize);
1509 return 1;
1510 }
1511
1512 rs = (struct reiserfs_super_block *)bh->b_data;
1513 if (sb_blocksize(rs) != s->s_blocksize) {
1514 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1515 "filesystem on (dev %s, block %Lu, size %lu)",
1516 reiserfs_bdevname(s),
1517 (unsigned long long)bh->b_blocknr,
1518 s->s_blocksize);
1519 brelse(bh);
1520 return 1;
1521 }
1522
1523 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1524 brelse(bh);
1525 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1526 "--rebuild-tree run detected. Please run\n"
1527 "reiserfsck --rebuild-tree and wait for a "
1528 "completion. If that fails\n"
1529 "get newer reiserfsprogs package");
1530 return 1;
1531 }
1532
1533 SB_BUFFER_WITH_SB(s) = bh;
1534 SB_DISK_SUPER_BLOCK(s) = rs;
1535
1536 if (is_reiserfs_jr(rs)) {
1537 /* magic is of non-standard journal filesystem, look at s_version to
1538 find which format is in use */
1539 if (sb_version(rs) == REISERFS_VERSION_2)
1540 reiserfs_info(s, "found reiserfs format \"3.6\""
1541 " with non-standard journal\n");
1542 else if (sb_version(rs) == REISERFS_VERSION_1)
1543 reiserfs_info(s, "found reiserfs format \"3.5\""
1544 " with non-standard journal\n");
1545 else {
1546 reiserfs_warning(s, "sh-2012", "found unknown "
1547 "format \"%u\" of reiserfs with "
1548 "non-standard magic", sb_version(rs));
1549 return 1;
1550 }
1551 } else
1552 /* s_version of standard format may contain incorrect information,
1553 so we just look at the magic string */
1554 reiserfs_info(s,
1555 "found reiserfs format \"%s\" with standard journal\n",
1556 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1557
1558 s->s_op = &reiserfs_sops;
1559 s->s_export_op = &reiserfs_export_ops;
1560 #ifdef CONFIG_QUOTA
1561 s->s_qcop = &reiserfs_qctl_operations;
1562 s->dq_op = &reiserfs_quota_operations;
1563 #endif
1564
1565 /* new format is limited by the 32 bit wide i_blocks field, want to
1566 ** be one full block below that.
1567 */
1568 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1569 return 0;
1570 }
1571
1572 /* after journal replay, reread all bitmap and super blocks */
1573 static int reread_meta_blocks(struct super_block *s)
1574 {
1575 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1576 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1577 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1578 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1579 return 1;
1580 }
1581
1582 return 0;
1583 }
1584
1585 /////////////////////////////////////////////////////
1586 // hash detection stuff
1587
1588 // if root directory is empty - we set default - Yura's - hash and
1589 // warn about it
1590 // FIXME: we look for only one name in a directory. If tea and yura
1591 // bith have the same value - we ask user to send report to the
1592 // mailing list
1593 static __u32 find_hash_out(struct super_block *s)
1594 {
1595 int retval;
1596 struct inode *inode;
1597 struct cpu_key key;
1598 INITIALIZE_PATH(path);
1599 struct reiserfs_dir_entry de;
1600 __u32 hash = DEFAULT_HASH;
1601
1602 inode = s->s_root->d_inode;
1603
1604 do { // Some serious "goto"-hater was there ;)
1605 u32 teahash, r5hash, yurahash;
1606
1607 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1608 retval = search_by_entry_key(s, &key, &path, &de);
1609 if (retval == IO_ERROR) {
1610 pathrelse(&path);
1611 return UNSET_HASH;
1612 }
1613 if (retval == NAME_NOT_FOUND)
1614 de.de_entry_num--;
1615 set_de_name_and_namelen(&de);
1616 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1617 /* allow override in this case */
1618 if (reiserfs_rupasov_hash(s)) {
1619 hash = YURA_HASH;
1620 }
1621 reiserfs_info(s, "FS seems to be empty, autodetect "
1622 "is using the default hash\n");
1623 break;
1624 }
1625 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1626 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1627 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1628 if (((teahash == r5hash)
1629 &&
1630 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1631 == r5hash)) || ((teahash == yurahash)
1632 && (yurahash ==
1633 GET_HASH_VALUE(deh_offset
1634 (&
1635 (de.
1636 de_deh[de.
1637 de_entry_num])))))
1638 || ((r5hash == yurahash)
1639 && (yurahash ==
1640 GET_HASH_VALUE(deh_offset
1641 (&(de.de_deh[de.de_entry_num])))))) {
1642 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1643 "automatically detect hash function. "
1644 "Please mount with -o "
1645 "hash={tea,rupasov,r5}");
1646 hash = UNSET_HASH;
1647 break;
1648 }
1649 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1650 yurahash)
1651 hash = YURA_HASH;
1652 else if (GET_HASH_VALUE
1653 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1654 hash = TEA_HASH;
1655 else if (GET_HASH_VALUE
1656 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1657 hash = R5_HASH;
1658 else {
1659 reiserfs_warning(s, "reiserfs-2506",
1660 "Unrecognised hash function");
1661 hash = UNSET_HASH;
1662 }
1663 } while (0);
1664
1665 pathrelse(&path);
1666 return hash;
1667 }
1668
1669 // finds out which hash names are sorted with
1670 static int what_hash(struct super_block *s)
1671 {
1672 __u32 code;
1673
1674 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1675
1676 /* reiserfs_hash_detect() == true if any of the hash mount options
1677 ** were used. We must check them to make sure the user isn't
1678 ** using a bad hash value
1679 */
1680 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1681 code = find_hash_out(s);
1682
1683 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1684 /* detection has found the hash, and we must check against the
1685 ** mount options
1686 */
1687 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1688 reiserfs_warning(s, "reiserfs-2507",
1689 "Error, %s hash detected, "
1690 "unable to force rupasov hash",
1691 reiserfs_hashname(code));
1692 code = UNSET_HASH;
1693 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1694 reiserfs_warning(s, "reiserfs-2508",
1695 "Error, %s hash detected, "
1696 "unable to force tea hash",
1697 reiserfs_hashname(code));
1698 code = UNSET_HASH;
1699 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1700 reiserfs_warning(s, "reiserfs-2509",
1701 "Error, %s hash detected, "
1702 "unable to force r5 hash",
1703 reiserfs_hashname(code));
1704 code = UNSET_HASH;
1705 }
1706 } else {
1707 /* find_hash_out was not called or could not determine the hash */
1708 if (reiserfs_rupasov_hash(s)) {
1709 code = YURA_HASH;
1710 } else if (reiserfs_tea_hash(s)) {
1711 code = TEA_HASH;
1712 } else if (reiserfs_r5_hash(s)) {
1713 code = R5_HASH;
1714 }
1715 }
1716
1717 /* if we are mounted RW, and we have a new valid hash code, update
1718 ** the super
1719 */
1720 if (code != UNSET_HASH &&
1721 !(s->s_flags & MS_RDONLY) &&
1722 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1723 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1724 }
1725 return code;
1726 }
1727
1728 // return pointer to appropriate function
1729 static hashf_t hash_function(struct super_block *s)
1730 {
1731 switch (what_hash(s)) {
1732 case TEA_HASH:
1733 reiserfs_info(s, "Using tea hash to sort names\n");
1734 return keyed_hash;
1735 case YURA_HASH:
1736 reiserfs_info(s, "Using rupasov hash to sort names\n");
1737 return yura_hash;
1738 case R5_HASH:
1739 reiserfs_info(s, "Using r5 hash to sort names\n");
1740 return r5_hash;
1741 }
1742 return NULL;
1743 }
1744
1745 // this is used to set up correct value for old partitions
1746 static int function2code(hashf_t func)
1747 {
1748 if (func == keyed_hash)
1749 return TEA_HASH;
1750 if (func == yura_hash)
1751 return YURA_HASH;
1752 if (func == r5_hash)
1753 return R5_HASH;
1754
1755 BUG(); // should never happen
1756
1757 return 0;
1758 }
1759
1760 #define SWARN(silent, s, id, ...) \
1761 if (!(silent)) \
1762 reiserfs_warning(s, id, __VA_ARGS__)
1763
1764 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1765 {
1766 struct inode *root_inode;
1767 struct reiserfs_transaction_handle th;
1768 int old_format = 0;
1769 unsigned long blocks;
1770 unsigned int commit_max_age = 0;
1771 int jinit_done = 0;
1772 struct reiserfs_iget_args args;
1773 struct reiserfs_super_block *rs;
1774 char *jdev_name;
1775 struct reiserfs_sb_info *sbi;
1776 int errval = -EINVAL;
1777 char *qf_names[MAXQUOTAS] = {};
1778 unsigned int qfmt = 0;
1779
1780 save_mount_options(s, data);
1781
1782 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1783 if (!sbi)
1784 return -ENOMEM;
1785 s->s_fs_info = sbi;
1786 /* Set default values for options: non-aggressive tails, RO on errors */
1787 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1788 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1789 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1790 /* no preallocation minimum, be smart in
1791 reiserfs_file_write instead */
1792 sbi->s_alloc_options.preallocmin = 0;
1793 /* Preallocate by 16 blocks (17-1) at once */
1794 sbi->s_alloc_options.preallocsize = 17;
1795 /* setup default block allocator options */
1796 reiserfs_init_alloc_options(s);
1797
1798 spin_lock_init(&sbi->old_work_lock);
1799 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1800 mutex_init(&sbi->lock);
1801 sbi->lock_depth = -1;
1802
1803 jdev_name = NULL;
1804 if (reiserfs_parse_options
1805 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1806 &commit_max_age, qf_names, &qfmt) == 0) {
1807 goto error_unlocked;
1808 }
1809 if (jdev_name && jdev_name[0]) {
1810 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1811 if (!sbi->s_jdev) {
1812 SWARN(silent, s, "", "Cannot allocate memory for "
1813 "journal device name");
1814 goto error;
1815 }
1816 }
1817 #ifdef CONFIG_QUOTA
1818 handle_quota_files(s, qf_names, &qfmt);
1819 #endif
1820
1821 if (blocks) {
1822 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1823 goto error_unlocked;
1824 }
1825
1826 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1827 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1828 old_format = 1;
1829 /* try new format (64-th 1k block), which can contain reiserfs super block */
1830 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1831 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1832 reiserfs_bdevname(s));
1833 goto error_unlocked;
1834 }
1835
1836 rs = SB_DISK_SUPER_BLOCK(s);
1837 /* Let's do basic sanity check to verify that underlying device is not
1838 smaller than the filesystem. If the check fails then abort and scream,
1839 because bad stuff will happen otherwise. */
1840 if (s->s_bdev && s->s_bdev->bd_inode
1841 && i_size_read(s->s_bdev->bd_inode) <
1842 sb_block_count(rs) * sb_blocksize(rs)) {
1843 SWARN(silent, s, "", "Filesystem cannot be "
1844 "mounted because it is bigger than the device");
1845 SWARN(silent, s, "", "You may need to run fsck "
1846 "or increase size of your LVM partition");
1847 SWARN(silent, s, "", "Or may be you forgot to "
1848 "reboot after fdisk when it told you to");
1849 goto error_unlocked;
1850 }
1851
1852 sbi->s_mount_state = SB_REISERFS_STATE(s);
1853 sbi->s_mount_state = REISERFS_VALID_FS;
1854
1855 if ((errval = reiserfs_init_bitmap_cache(s))) {
1856 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1857 goto error_unlocked;
1858 }
1859
1860 errval = -EINVAL;
1861 #ifdef CONFIG_REISERFS_CHECK
1862 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1863 SWARN(silent, s, "", "- it is slow mode for debugging.");
1864 #endif
1865
1866 /* make data=ordered the default */
1867 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1868 !reiserfs_data_writeback(s)) {
1869 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1870 }
1871
1872 if (reiserfs_data_log(s)) {
1873 reiserfs_info(s, "using journaled data mode\n");
1874 } else if (reiserfs_data_ordered(s)) {
1875 reiserfs_info(s, "using ordered data mode\n");
1876 } else {
1877 reiserfs_info(s, "using writeback data mode\n");
1878 }
1879 if (reiserfs_barrier_flush(s)) {
1880 printk("reiserfs: using flush barriers\n");
1881 }
1882
1883 // set_device_ro(s->s_dev, 1) ;
1884 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1885 SWARN(silent, s, "sh-2022",
1886 "unable to initialize journal space");
1887 goto error_unlocked;
1888 } else {
1889 jinit_done = 1; /* once this is set, journal_release must be called
1890 ** if we error out of the mount
1891 */
1892 }
1893
1894 if (reread_meta_blocks(s)) {
1895 SWARN(silent, s, "jmacd-9",
1896 "unable to reread meta blocks after journal init");
1897 goto error_unlocked;
1898 }
1899
1900 if (replay_only(s))
1901 goto error_unlocked;
1902
1903 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1904 SWARN(silent, s, "clm-7000",
1905 "Detected readonly device, marking FS readonly");
1906 s->s_flags |= MS_RDONLY;
1907 }
1908 args.objectid = REISERFS_ROOT_OBJECTID;
1909 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1910 root_inode =
1911 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1912 reiserfs_init_locked_inode, (void *)(&args));
1913 if (!root_inode) {
1914 SWARN(silent, s, "jmacd-10", "get root inode failed");
1915 goto error_unlocked;
1916 }
1917
1918 /*
1919 * This path assumed to be called with the BKL in the old times.
1920 * Now we have inherited the big reiserfs lock from it and many
1921 * reiserfs helpers called in the mount path and elsewhere require
1922 * this lock to be held even if it's not always necessary. Let's be
1923 * conservative and hold it early. The window can be reduced after
1924 * careful review of the code.
1925 */
1926 reiserfs_write_lock(s);
1927
1928 if (root_inode->i_state & I_NEW) {
1929 reiserfs_read_locked_inode(root_inode, &args);
1930 unlock_new_inode(root_inode);
1931 }
1932
1933 s->s_root = d_make_root(root_inode);
1934 if (!s->s_root)
1935 goto error;
1936 // define and initialize hash function
1937 sbi->s_hash_function = hash_function(s);
1938 if (sbi->s_hash_function == NULL) {
1939 dput(s->s_root);
1940 s->s_root = NULL;
1941 goto error;
1942 }
1943
1944 if (is_reiserfs_3_5(rs)
1945 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1946 set_bit(REISERFS_3_5, &(sbi->s_properties));
1947 else if (old_format)
1948 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1949 else
1950 set_bit(REISERFS_3_6, &(sbi->s_properties));
1951
1952 if (!(s->s_flags & MS_RDONLY)) {
1953
1954 errval = journal_begin(&th, s, 1);
1955 if (errval) {
1956 dput(s->s_root);
1957 s->s_root = NULL;
1958 goto error;
1959 }
1960 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1961
1962 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1963 set_sb_fs_state(rs, 0);
1964
1965 /* Clear out s_bmap_nr if it would wrap. We can handle this
1966 * case, but older revisions can't. This will cause the
1967 * file system to fail mount on those older implementations,
1968 * avoiding corruption. -jeffm */
1969 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1970 sb_bmap_nr(rs) != 0) {
1971 reiserfs_warning(s, "super-2030", "This file system "
1972 "claims to use %u bitmap blocks in "
1973 "its super block, but requires %u. "
1974 "Clearing to zero.", sb_bmap_nr(rs),
1975 reiserfs_bmap_count(s));
1976
1977 set_sb_bmap_nr(rs, 0);
1978 }
1979
1980 if (old_format_only(s)) {
1981 /* filesystem of format 3.5 either with standard or non-standard
1982 journal */
1983 if (convert_reiserfs(s)) {
1984 /* and -o conv is given */
1985 if (!silent)
1986 reiserfs_info(s,
1987 "converting 3.5 filesystem to the 3.6 format");
1988
1989 if (is_reiserfs_3_5(rs))
1990 /* put magic string of 3.6 format. 2.2 will not be able to
1991 mount this filesystem anymore */
1992 memcpy(rs->s_v1.s_magic,
1993 reiserfs_3_6_magic_string,
1994 sizeof
1995 (reiserfs_3_6_magic_string));
1996
1997 set_sb_version(rs, REISERFS_VERSION_2);
1998 reiserfs_convert_objectid_map_v1(s);
1999 set_bit(REISERFS_3_6, &(sbi->s_properties));
2000 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2001 } else if (!silent) {
2002 reiserfs_info(s, "using 3.5.x disk format\n");
2003 }
2004 } else
2005 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2006
2007
2008 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2009 errval = journal_end(&th, s, 1);
2010 if (errval) {
2011 dput(s->s_root);
2012 s->s_root = NULL;
2013 goto error;
2014 }
2015
2016 if ((errval = reiserfs_lookup_privroot(s)) ||
2017 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2018 dput(s->s_root);
2019 s->s_root = NULL;
2020 goto error;
2021 }
2022
2023 /* look for files which were to be removed in previous session */
2024 finish_unfinished(s);
2025 } else {
2026 if (old_format_only(s) && !silent) {
2027 reiserfs_info(s, "using 3.5.x disk format\n");
2028 }
2029
2030 if ((errval = reiserfs_lookup_privroot(s)) ||
2031 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2032 dput(s->s_root);
2033 s->s_root = NULL;
2034 goto error;
2035 }
2036 }
2037 // mark hash in super block: it could be unset. overwrite should be ok
2038 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2039
2040 handle_attrs(s);
2041
2042 reiserfs_proc_info_init(s);
2043
2044 init_waitqueue_head(&(sbi->s_wait));
2045 spin_lock_init(&sbi->bitmap_lock);
2046
2047 reiserfs_write_unlock(s);
2048
2049 return (0);
2050
2051 error:
2052 reiserfs_write_unlock(s);
2053
2054 error_unlocked:
2055 /* kill the commit thread, free journal ram */
2056 if (jinit_done) {
2057 reiserfs_write_lock(s);
2058 journal_release_error(NULL, s);
2059 reiserfs_write_unlock(s);
2060 }
2061
2062 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2063
2064 reiserfs_free_bitmap_cache(s);
2065 if (SB_BUFFER_WITH_SB(s))
2066 brelse(SB_BUFFER_WITH_SB(s));
2067 #ifdef CONFIG_QUOTA
2068 {
2069 int j;
2070 for (j = 0; j < MAXQUOTAS; j++)
2071 kfree(qf_names[j]);
2072 }
2073 #endif
2074 kfree(sbi);
2075
2076 s->s_fs_info = NULL;
2077 return errval;
2078 }
2079
2080 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2081 {
2082 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2083
2084 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2085 buf->f_bfree = sb_free_blocks(rs);
2086 buf->f_bavail = buf->f_bfree;
2087 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2088 buf->f_bsize = dentry->d_sb->s_blocksize;
2089 /* changed to accommodate gcc folks. */
2090 buf->f_type = REISERFS_SUPER_MAGIC;
2091 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2092 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2093 sizeof(rs->s_uuid)/2);
2094
2095 return 0;
2096 }
2097
2098 #ifdef CONFIG_QUOTA
2099 static int reiserfs_write_dquot(struct dquot *dquot)
2100 {
2101 struct reiserfs_transaction_handle th;
2102 int ret, err;
2103
2104 reiserfs_write_lock(dquot->dq_sb);
2105 ret =
2106 journal_begin(&th, dquot->dq_sb,
2107 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2108 if (ret)
2109 goto out;
2110 reiserfs_write_unlock(dquot->dq_sb);
2111 ret = dquot_commit(dquot);
2112 reiserfs_write_lock(dquot->dq_sb);
2113 err =
2114 journal_end(&th, dquot->dq_sb,
2115 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2116 if (!ret && err)
2117 ret = err;
2118 out:
2119 reiserfs_write_unlock(dquot->dq_sb);
2120 return ret;
2121 }
2122
2123 static int reiserfs_acquire_dquot(struct dquot *dquot)
2124 {
2125 struct reiserfs_transaction_handle th;
2126 int ret, err;
2127
2128 reiserfs_write_lock(dquot->dq_sb);
2129 ret =
2130 journal_begin(&th, dquot->dq_sb,
2131 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2132 if (ret)
2133 goto out;
2134 reiserfs_write_unlock(dquot->dq_sb);
2135 ret = dquot_acquire(dquot);
2136 reiserfs_write_lock(dquot->dq_sb);
2137 err =
2138 journal_end(&th, dquot->dq_sb,
2139 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2140 if (!ret && err)
2141 ret = err;
2142 out:
2143 reiserfs_write_unlock(dquot->dq_sb);
2144 return ret;
2145 }
2146
2147 static int reiserfs_release_dquot(struct dquot *dquot)
2148 {
2149 struct reiserfs_transaction_handle th;
2150 int ret, err;
2151
2152 reiserfs_write_lock(dquot->dq_sb);
2153 ret =
2154 journal_begin(&th, dquot->dq_sb,
2155 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2156 reiserfs_write_unlock(dquot->dq_sb);
2157 if (ret) {
2158 /* Release dquot anyway to avoid endless cycle in dqput() */
2159 dquot_release(dquot);
2160 goto out;
2161 }
2162 ret = dquot_release(dquot);
2163 reiserfs_write_lock(dquot->dq_sb);
2164 err =
2165 journal_end(&th, dquot->dq_sb,
2166 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2167 if (!ret && err)
2168 ret = err;
2169 reiserfs_write_unlock(dquot->dq_sb);
2170 out:
2171 return ret;
2172 }
2173
2174 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2175 {
2176 /* Are we journaling quotas? */
2177 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2178 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2179 dquot_mark_dquot_dirty(dquot);
2180 return reiserfs_write_dquot(dquot);
2181 } else
2182 return dquot_mark_dquot_dirty(dquot);
2183 }
2184
2185 static int reiserfs_write_info(struct super_block *sb, int type)
2186 {
2187 struct reiserfs_transaction_handle th;
2188 int ret, err;
2189
2190 /* Data block + inode block */
2191 reiserfs_write_lock(sb);
2192 ret = journal_begin(&th, sb, 2);
2193 if (ret)
2194 goto out;
2195 reiserfs_write_unlock(sb);
2196 ret = dquot_commit_info(sb, type);
2197 reiserfs_write_lock(sb);
2198 err = journal_end(&th, sb, 2);
2199 if (!ret && err)
2200 ret = err;
2201 out:
2202 reiserfs_write_unlock(sb);
2203 return ret;
2204 }
2205
2206 /*
2207 * Turn on quotas during mount time - we need to find the quota file and such...
2208 */
2209 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2210 {
2211 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2212 REISERFS_SB(sb)->s_jquota_fmt, type);
2213 }
2214
2215 /*
2216 * Standard function to be called on quota_on
2217 */
2218 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2219 struct path *path)
2220 {
2221 int err;
2222 struct inode *inode;
2223 struct reiserfs_transaction_handle th;
2224 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2225
2226 reiserfs_write_lock(sb);
2227 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2228 err = -EINVAL;
2229 goto out;
2230 }
2231
2232 /* Quotafile not on the same filesystem? */
2233 if (path->dentry->d_sb != sb) {
2234 err = -EXDEV;
2235 goto out;
2236 }
2237 inode = path->dentry->d_inode;
2238 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2239 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2240 err = reiserfs_unpack(inode, NULL);
2241 if (err) {
2242 reiserfs_warning(sb, "super-6520",
2243 "Unpacking tail of quota file failed"
2244 " (%d). Cannot turn on quotas.", err);
2245 err = -EINVAL;
2246 goto out;
2247 }
2248 mark_inode_dirty(inode);
2249 }
2250 /* Journaling quota? */
2251 if (REISERFS_SB(sb)->s_qf_names[type]) {
2252 /* Quotafile not of fs root? */
2253 if (path->dentry->d_parent != sb->s_root)
2254 reiserfs_warning(sb, "super-6521",
2255 "Quota file not on filesystem root. "
2256 "Journalled quota will not work.");
2257 }
2258
2259 /*
2260 * When we journal data on quota file, we have to flush journal to see
2261 * all updates to the file when we bypass pagecache...
2262 */
2263 if (reiserfs_file_data_log(inode)) {
2264 /* Just start temporary transaction and finish it */
2265 err = journal_begin(&th, sb, 1);
2266 if (err)
2267 goto out;
2268 err = journal_end_sync(&th, sb, 1);
2269 if (err)
2270 goto out;
2271 }
2272 reiserfs_write_unlock(sb);
2273 return dquot_quota_on(sb, type, format_id, path);
2274 out:
2275 reiserfs_write_unlock(sb);
2276 return err;
2277 }
2278
2279 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2280 * acquiring the locks... As quota files are never truncated and quota code
2281 * itself serializes the operations (and no one else should touch the files)
2282 * we don't have to be afraid of races */
2283 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2284 size_t len, loff_t off)
2285 {
2286 struct inode *inode = sb_dqopt(sb)->files[type];
2287 unsigned long blk = off >> sb->s_blocksize_bits;
2288 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2289 size_t toread;
2290 struct buffer_head tmp_bh, *bh;
2291 loff_t i_size = i_size_read(inode);
2292
2293 if (off > i_size)
2294 return 0;
2295 if (off + len > i_size)
2296 len = i_size - off;
2297 toread = len;
2298 while (toread > 0) {
2299 tocopy =
2300 sb->s_blocksize - offset <
2301 toread ? sb->s_blocksize - offset : toread;
2302 tmp_bh.b_state = 0;
2303 /* Quota files are without tails so we can safely use this function */
2304 reiserfs_write_lock(sb);
2305 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2306 reiserfs_write_unlock(sb);
2307 if (err)
2308 return err;
2309 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2310 memset(data, 0, tocopy);
2311 else {
2312 bh = sb_bread(sb, tmp_bh.b_blocknr);
2313 if (!bh)
2314 return -EIO;
2315 memcpy(data, bh->b_data + offset, tocopy);
2316 brelse(bh);
2317 }
2318 offset = 0;
2319 toread -= tocopy;
2320 data += tocopy;
2321 blk++;
2322 }
2323 return len;
2324 }
2325
2326 /* Write to quotafile (we know the transaction is already started and has
2327 * enough credits) */
2328 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2329 const char *data, size_t len, loff_t off)
2330 {
2331 struct inode *inode = sb_dqopt(sb)->files[type];
2332 unsigned long blk = off >> sb->s_blocksize_bits;
2333 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2334 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2335 size_t towrite = len;
2336 struct buffer_head tmp_bh, *bh;
2337
2338 if (!current->journal_info) {
2339 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2340 " cancelled because transaction is not started.\n",
2341 (unsigned long long)off, (unsigned long long)len);
2342 return -EIO;
2343 }
2344 while (towrite > 0) {
2345 tocopy = sb->s_blocksize - offset < towrite ?
2346 sb->s_blocksize - offset : towrite;
2347 tmp_bh.b_state = 0;
2348 reiserfs_write_lock(sb);
2349 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2350 reiserfs_write_unlock(sb);
2351 if (err)
2352 goto out;
2353 if (offset || tocopy != sb->s_blocksize)
2354 bh = sb_bread(sb, tmp_bh.b_blocknr);
2355 else
2356 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2357 if (!bh) {
2358 err = -EIO;
2359 goto out;
2360 }
2361 lock_buffer(bh);
2362 memcpy(bh->b_data + offset, data, tocopy);
2363 flush_dcache_page(bh->b_page);
2364 set_buffer_uptodate(bh);
2365 unlock_buffer(bh);
2366 reiserfs_write_lock(sb);
2367 reiserfs_prepare_for_journal(sb, bh, 1);
2368 journal_mark_dirty(current->journal_info, sb, bh);
2369 if (!journal_quota)
2370 reiserfs_add_ordered_list(inode, bh);
2371 reiserfs_write_unlock(sb);
2372 brelse(bh);
2373 offset = 0;
2374 towrite -= tocopy;
2375 data += tocopy;
2376 blk++;
2377 }
2378 out:
2379 if (len == towrite)
2380 return err;
2381 if (inode->i_size < off + len - towrite)
2382 i_size_write(inode, off + len - towrite);
2383 inode->i_version++;
2384 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2385 mark_inode_dirty(inode);
2386 return len - towrite;
2387 }
2388
2389 #endif
2390
2391 static struct dentry *get_super_block(struct file_system_type *fs_type,
2392 int flags, const char *dev_name,
2393 void *data)
2394 {
2395 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2396 }
2397
2398 static int __init init_reiserfs_fs(void)
2399 {
2400 int ret;
2401
2402 if ((ret = init_inodecache())) {
2403 return ret;
2404 }
2405
2406 reiserfs_proc_info_global_init();
2407
2408 ret = register_filesystem(&reiserfs_fs_type);
2409
2410 if (ret == 0) {
2411 return 0;
2412 }
2413
2414 reiserfs_proc_info_global_done();
2415 destroy_inodecache();
2416
2417 return ret;
2418 }
2419
2420 static void __exit exit_reiserfs_fs(void)
2421 {
2422 reiserfs_proc_info_global_done();
2423 unregister_filesystem(&reiserfs_fs_type);
2424 destroy_inodecache();
2425 }
2426
2427 struct file_system_type reiserfs_fs_type = {
2428 .owner = THIS_MODULE,
2429 .name = "reiserfs",
2430 .mount = get_super_block,
2431 .kill_sb = reiserfs_kill_sb,
2432 .fs_flags = FS_REQUIRES_DEV,
2433 };
2434 MODULE_ALIAS_FS("reiserfs");
2435
2436 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2437 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2438 MODULE_LICENSE("GPL");
2439
2440 module_init(init_reiserfs_fs);
2441 module_exit(exit_reiserfs_fs);
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