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iio: hid-sensors: Inclinometer 3D: adjust scale and offset
[linux-2.6/btrfs-unstable.git] / fs / reiserfs / super.c
blob9fb20426005e4ff3a0af37f675bdc4d5a29ffb84
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, s, 1))
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, s, SB_BUFFER_WITH_SB(s));
140 reiserfs_block_writes(&th);
141 journal_end_sync(&th, s, 1);
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 /* this is used to delete "save link" when there are no items of a
157 file it points to. It can either happen if unlink is completed but
158 "save unlink" removal, or if file has both unlink and truncate
159 pending and as unlink completes first (because key of "save link"
160 protecting unlink is bigger that a key lf "save link" which
161 protects truncate), so there left no items to make truncate
162 completion on */
163 static int remove_save_link_only(struct super_block *s,
164 struct reiserfs_key *key, int oid_free)
165 {
166 struct reiserfs_transaction_handle th;
167 int err;
168
169 /* we are going to do one balancing */
170 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
171 if (err)
172 return err;
173
174 reiserfs_delete_solid_item(&th, NULL, key);
175 if (oid_free)
176 /* removals are protected by direct items */
177 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
178
179 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
180 }
181
182 #ifdef CONFIG_QUOTA
183 static int reiserfs_quota_on_mount(struct super_block *, int);
184 #endif
185
186 /* look for uncompleted unlinks and truncates and complete them */
187 static int finish_unfinished(struct super_block *s)
188 {
189 INITIALIZE_PATH(path);
190 struct cpu_key max_cpu_key, obj_key;
191 struct reiserfs_key save_link_key, last_inode_key;
192 int retval = 0;
193 struct item_head *ih;
194 struct buffer_head *bh;
195 int item_pos;
196 char *item;
197 int done;
198 struct inode *inode;
199 int truncate;
200 #ifdef CONFIG_QUOTA
201 int i;
202 int ms_active_set;
203 int quota_enabled[MAXQUOTAS];
204 #endif
205
206 /* compose key to look for "save" links */
207 max_cpu_key.version = KEY_FORMAT_3_5;
208 max_cpu_key.on_disk_key.k_dir_id = ~0U;
209 max_cpu_key.on_disk_key.k_objectid = ~0U;
210 set_cpu_key_k_offset(&max_cpu_key, ~0U);
211 max_cpu_key.key_length = 3;
212
213 memset(&last_inode_key, 0, sizeof(last_inode_key));
214
215 #ifdef CONFIG_QUOTA
216 /* Needed for iput() to work correctly and not trash data */
217 if (s->s_flags & MS_ACTIVE) {
218 ms_active_set = 0;
219 } else {
220 ms_active_set = 1;
221 s->s_flags |= MS_ACTIVE;
222 }
223 /* Turn on quotas so that they are updated correctly */
224 for (i = 0; i < MAXQUOTAS; i++) {
225 quota_enabled[i] = 1;
226 if (REISERFS_SB(s)->s_qf_names[i]) {
227 int ret;
228
229 if (sb_has_quota_active(s, i)) {
230 quota_enabled[i] = 0;
231 continue;
232 }
233 ret = reiserfs_quota_on_mount(s, i);
234 if (ret < 0)
235 reiserfs_warning(s, "reiserfs-2500",
236 "cannot turn on journaled "
237 "quota: error %d", ret);
238 }
239 }
240 #endif
241
242 done = 0;
243 REISERFS_SB(s)->s_is_unlinked_ok = 1;
244 while (!retval) {
245 int depth;
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 depth = reiserfs_write_unlock_nested(inode->i_sb);
302 dquot_initialize(inode);
303 reiserfs_write_lock_nested(inode->i_sb, depth);
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 reiserfs_write_unlock(s);
360 for (i = 0; i < MAXQUOTAS; i++) {
361 if (sb_dqopt(s)->files[i] && quota_enabled[i])
362 dquot_quota_off(s, i);
363 }
364 reiserfs_write_lock(s);
365 if (ms_active_set)
366 /* Restore the flag back */
367 s->s_flags &= ~MS_ACTIVE;
368 #endif
369 pathrelse(&path);
370 if (done)
371 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
372 "Completed\n", done);
373 return retval;
374 }
375
376 /* to protect file being unlinked from getting lost we "safe" link files
377 being unlinked. This link will be deleted in the same transaction with last
378 item of file. mounting the filesystem we scan all these links and remove
379 files which almost got lost */
380 void add_save_link(struct reiserfs_transaction_handle *th,
381 struct inode *inode, int truncate)
382 {
383 INITIALIZE_PATH(path);
384 int retval;
385 struct cpu_key key;
386 struct item_head ih;
387 __le32 link;
388
389 BUG_ON(!th->t_trans_id);
390
391 /* file can only get one "save link" of each kind */
392 RFALSE(truncate &&
393 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
394 "saved link already exists for truncated inode %lx",
395 (long)inode->i_ino);
396 RFALSE(!truncate &&
397 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
398 "saved link already exists for unlinked inode %lx",
399 (long)inode->i_ino);
400
401 /* setup key of "save" link */
402 key.version = KEY_FORMAT_3_5;
403 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
404 key.on_disk_key.k_objectid = inode->i_ino;
405 if (!truncate) {
406 /* unlink, rmdir, rename */
407 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
408 set_cpu_key_k_type(&key, TYPE_DIRECT);
409
410 /* item head of "safe" link */
411 make_le_item_head(&ih, &key, key.version,
412 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
413 4 /*length */ , 0xffff /*free space */ );
414 } else {
415 /* truncate */
416 if (S_ISDIR(inode->i_mode))
417 reiserfs_warning(inode->i_sb, "green-2102",
418 "Adding a truncate savelink for "
419 "a directory %k! Please report",
420 INODE_PKEY(inode));
421 set_cpu_key_k_offset(&key, 1);
422 set_cpu_key_k_type(&key, TYPE_INDIRECT);
423
424 /* item head of "safe" link */
425 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
426 4 /*length */ , 0 /*free space */ );
427 }
428 key.key_length = 3;
429
430 /* look for its place in the tree */
431 retval = search_item(inode->i_sb, &key, &path);
432 if (retval != ITEM_NOT_FOUND) {
433 if (retval != -ENOSPC)
434 reiserfs_error(inode->i_sb, "vs-2100",
435 "search_by_key (%K) returned %d", &key,
436 retval);
437 pathrelse(&path);
438 return;
439 }
440
441 /* body of "save" link */
442 link = INODE_PKEY(inode)->k_dir_id;
443
444 /* put "save" link into tree, don't charge quota to anyone */
445 retval =
446 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
447 if (retval) {
448 if (retval != -ENOSPC)
449 reiserfs_error(inode->i_sb, "vs-2120",
450 "insert_item returned %d", retval);
451 } else {
452 if (truncate)
453 REISERFS_I(inode)->i_flags |=
454 i_link_saved_truncate_mask;
455 else
456 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
457 }
458 }
459
460 /* this opens transaction unlike add_save_link */
461 int remove_save_link(struct inode *inode, int truncate)
462 {
463 struct reiserfs_transaction_handle th;
464 struct reiserfs_key key;
465 int err;
466
467 /* we are going to do one balancing only */
468 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
469 if (err)
470 return err;
471
472 /* setup key of "save" link */
473 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
474 key.k_objectid = INODE_PKEY(inode)->k_objectid;
475 if (!truncate) {
476 /* unlink, rmdir, rename */
477 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
478 1 + inode->i_sb->s_blocksize);
479 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
480 } else {
481 /* truncate */
482 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
483 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
484 }
485
486 if ((truncate &&
487 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
488 (!truncate &&
489 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
490 /* don't take quota bytes from anywhere */
491 reiserfs_delete_solid_item(&th, NULL, &key);
492 if (!truncate) {
493 reiserfs_release_objectid(&th, inode->i_ino);
494 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
495 } else
496 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
497
498 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
499 }
500
501 static void reiserfs_kill_sb(struct super_block *s)
502 {
503 if (REISERFS_SB(s)) {
504 reiserfs_proc_info_done(s);
505 /*
506 * Force any pending inode evictions to occur now. Any
507 * inodes to be removed that have extended attributes
508 * associated with them need to clean them up before
509 * we can release the extended attribute root dentries.
510 * shrink_dcache_for_umount will BUG if we don't release
511 * those before it's called so ->put_super is too late.
512 */
513 shrink_dcache_sb(s);
514
515 dput(REISERFS_SB(s)->xattr_root);
516 REISERFS_SB(s)->xattr_root = NULL;
517 dput(REISERFS_SB(s)->priv_root);
518 REISERFS_SB(s)->priv_root = NULL;
519 }
520
521 kill_block_super(s);
522 }
523
524 static void reiserfs_put_super(struct super_block *s)
525 {
526 struct reiserfs_transaction_handle th;
527 th.t_trans_id = 0;
528
529 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
530
531 reiserfs_write_lock(s);
532
533 /* change file system state to current state if it was mounted with read-write permissions */
534 if (!(s->s_flags & MS_RDONLY)) {
535 if (!journal_begin(&th, s, 10)) {
536 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
537 1);
538 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
539 REISERFS_SB(s)->s_mount_state);
540 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
541 }
542 }
543
544 /* note, journal_release checks for readonly mount, and can decide not
545 ** to do a journal_end
546 */
547 journal_release(&th, s);
548
549 reiserfs_free_bitmap_cache(s);
550
551 brelse(SB_BUFFER_WITH_SB(s));
552
553 print_statistics(s);
554
555 if (REISERFS_SB(s)->reserved_blocks != 0) {
556 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
557 REISERFS_SB(s)->reserved_blocks);
558 }
559
560 reiserfs_write_unlock(s);
561 mutex_destroy(&REISERFS_SB(s)->lock);
562 kfree(s->s_fs_info);
563 s->s_fs_info = NULL;
564 }
565
566 static struct kmem_cache *reiserfs_inode_cachep;
567
568 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
569 {
570 struct reiserfs_inode_info *ei;
571 ei = (struct reiserfs_inode_info *)
572 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
573 if (!ei)
574 return NULL;
575 atomic_set(&ei->openers, 0);
576 mutex_init(&ei->tailpack);
577 return &ei->vfs_inode;
578 }
579
580 static void reiserfs_i_callback(struct rcu_head *head)
581 {
582 struct inode *inode = container_of(head, struct inode, i_rcu);
583 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
584 }
585
586 static void reiserfs_destroy_inode(struct inode *inode)
587 {
588 call_rcu(&inode->i_rcu, reiserfs_i_callback);
589 }
590
591 static void init_once(void *foo)
592 {
593 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
594
595 INIT_LIST_HEAD(&ei->i_prealloc_list);
596 inode_init_once(&ei->vfs_inode);
597 }
598
599 static int __init init_inodecache(void)
600 {
601 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
602 sizeof(struct
603 reiserfs_inode_info),
604 0, (SLAB_RECLAIM_ACCOUNT|
605 SLAB_MEM_SPREAD),
606 init_once);
607 if (reiserfs_inode_cachep == NULL)
608 return -ENOMEM;
609 return 0;
610 }
611
612 static void destroy_inodecache(void)
613 {
614 /*
615 * Make sure all delayed rcu free inodes are flushed before we
616 * destroy cache.
617 */
618 rcu_barrier();
619 kmem_cache_destroy(reiserfs_inode_cachep);
620 }
621
622 /* we don't mark inodes dirty, we just log them */
623 static void reiserfs_dirty_inode(struct inode *inode, int flags)
624 {
625 struct reiserfs_transaction_handle th;
626
627 int err = 0;
628
629 if (inode->i_sb->s_flags & MS_RDONLY) {
630 reiserfs_warning(inode->i_sb, "clm-6006",
631 "writing inode %lu on readonly FS",
632 inode->i_ino);
633 return;
634 }
635 reiserfs_write_lock(inode->i_sb);
636
637 /* this is really only used for atime updates, so they don't have
638 ** to be included in O_SYNC or fsync
639 */
640 err = journal_begin(&th, inode->i_sb, 1);
641 if (err)
642 goto out;
643
644 reiserfs_update_sd(&th, inode);
645 journal_end(&th, inode->i_sb, 1);
646
647 out:
648 reiserfs_write_unlock(inode->i_sb);
649 }
650
651 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
652 {
653 struct super_block *s = root->d_sb;
654 struct reiserfs_journal *journal = SB_JOURNAL(s);
655 long opts = REISERFS_SB(s)->s_mount_opt;
656
657 if (opts & (1 << REISERFS_LARGETAIL))
658 seq_puts(seq, ",tails=on");
659 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
660 seq_puts(seq, ",notail");
661 /* tails=small is default so we don't show it */
662
663 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
664 seq_puts(seq, ",barrier=none");
665 /* barrier=flush is default so we don't show it */
666
667 if (opts & (1 << REISERFS_ERROR_CONTINUE))
668 seq_puts(seq, ",errors=continue");
669 else if (opts & (1 << REISERFS_ERROR_PANIC))
670 seq_puts(seq, ",errors=panic");
671 /* errors=ro is default so we don't show it */
672
673 if (opts & (1 << REISERFS_DATA_LOG))
674 seq_puts(seq, ",data=journal");
675 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
676 seq_puts(seq, ",data=writeback");
677 /* data=ordered is default so we don't show it */
678
679 if (opts & (1 << REISERFS_ATTRS))
680 seq_puts(seq, ",attrs");
681
682 if (opts & (1 << REISERFS_XATTRS_USER))
683 seq_puts(seq, ",user_xattr");
684
685 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
686 seq_puts(seq, ",expose_privroot");
687
688 if (opts & (1 << REISERFS_POSIXACL))
689 seq_puts(seq, ",acl");
690
691 if (REISERFS_SB(s)->s_jdev)
692 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
693
694 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
695 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
696
697 #ifdef CONFIG_QUOTA
698 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
699 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
700 else if (opts & (1 << REISERFS_USRQUOTA))
701 seq_puts(seq, ",usrquota");
702 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
703 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
704 else if (opts & (1 << REISERFS_GRPQUOTA))
705 seq_puts(seq, ",grpquota");
706 if (REISERFS_SB(s)->s_jquota_fmt) {
707 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
708 seq_puts(seq, ",jqfmt=vfsold");
709 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
710 seq_puts(seq, ",jqfmt=vfsv0");
711 }
712 #endif
713
714 /* Block allocator options */
715 if (opts & (1 << REISERFS_NO_BORDER))
716 seq_puts(seq, ",block-allocator=noborder");
717 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
718 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
719 if (opts & (1 << REISERFS_HASHED_RELOCATION))
720 seq_puts(seq, ",block-allocator=hashed_relocation");
721 if (opts & (1 << REISERFS_TEST4))
722 seq_puts(seq, ",block-allocator=test4");
723 show_alloc_options(seq, s);
724 return 0;
725 }
726
727 #ifdef CONFIG_QUOTA
728 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
729 size_t, loff_t);
730 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
731 loff_t);
732 #endif
733
734 static const struct super_operations reiserfs_sops = {
735 .alloc_inode = reiserfs_alloc_inode,
736 .destroy_inode = reiserfs_destroy_inode,
737 .write_inode = reiserfs_write_inode,
738 .dirty_inode = reiserfs_dirty_inode,
739 .evict_inode = reiserfs_evict_inode,
740 .put_super = reiserfs_put_super,
741 .sync_fs = reiserfs_sync_fs,
742 .freeze_fs = reiserfs_freeze,
743 .unfreeze_fs = reiserfs_unfreeze,
744 .statfs = reiserfs_statfs,
745 .remount_fs = reiserfs_remount,
746 .show_options = reiserfs_show_options,
747 #ifdef CONFIG_QUOTA
748 .quota_read = reiserfs_quota_read,
749 .quota_write = reiserfs_quota_write,
750 #endif
751 };
752
753 #ifdef CONFIG_QUOTA
754 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
755
756 static int reiserfs_write_dquot(struct dquot *);
757 static int reiserfs_acquire_dquot(struct dquot *);
758 static int reiserfs_release_dquot(struct dquot *);
759 static int reiserfs_mark_dquot_dirty(struct dquot *);
760 static int reiserfs_write_info(struct super_block *, int);
761 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
762
763 static const struct dquot_operations reiserfs_quota_operations = {
764 .write_dquot = reiserfs_write_dquot,
765 .acquire_dquot = reiserfs_acquire_dquot,
766 .release_dquot = reiserfs_release_dquot,
767 .mark_dirty = reiserfs_mark_dquot_dirty,
768 .write_info = reiserfs_write_info,
769 .alloc_dquot = dquot_alloc,
770 .destroy_dquot = dquot_destroy,
771 };
772
773 static const struct quotactl_ops reiserfs_qctl_operations = {
774 .quota_on = reiserfs_quota_on,
775 .quota_off = dquot_quota_off,
776 .quota_sync = dquot_quota_sync,
777 .get_info = dquot_get_dqinfo,
778 .set_info = dquot_set_dqinfo,
779 .get_dqblk = dquot_get_dqblk,
780 .set_dqblk = dquot_set_dqblk,
781 };
782 #endif
783
784 static const struct export_operations reiserfs_export_ops = {
785 .encode_fh = reiserfs_encode_fh,
786 .fh_to_dentry = reiserfs_fh_to_dentry,
787 .fh_to_parent = reiserfs_fh_to_parent,
788 .get_parent = reiserfs_get_parent,
789 };
790
791 /* this struct is used in reiserfs_getopt () for containing the value for those
792 mount options that have values rather than being toggles. */
793 typedef struct {
794 char *value;
795 int setmask; /* bitmask which is to set on mount_options bitmask when this
796 value is found, 0 is no bits are to be changed. */
797 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
798 value is found, 0 is no bits are to be changed. This is
799 applied BEFORE setmask */
800 } arg_desc_t;
801
802 /* Set this bit in arg_required to allow empty arguments */
803 #define REISERFS_OPT_ALLOWEMPTY 31
804
805 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
806 mount options */
807 typedef struct {
808 char *option_name;
809 int arg_required; /* 0 if argument is not required, not 0 otherwise */
810 const arg_desc_t *values; /* list of values accepted by an option */
811 int setmask; /* bitmask which is to set on mount_options bitmask when this
812 value is found, 0 is no bits are to be changed. */
813 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
814 value is found, 0 is no bits are to be changed. This is
815 applied BEFORE setmask */
816 } opt_desc_t;
817
818 /* possible values for -o data= */
819 static const arg_desc_t logging_mode[] = {
820 {"ordered", 1 << REISERFS_DATA_ORDERED,
821 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
822 {"journal", 1 << REISERFS_DATA_LOG,
823 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
824 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
825 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
826 {.value = NULL}
827 };
828
829 /* possible values for -o barrier= */
830 static const arg_desc_t barrier_mode[] = {
831 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
832 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
833 {.value = NULL}
834 };
835
836 /* possible values for "-o block-allocator=" and bits which are to be set in
837 s_mount_opt of reiserfs specific part of in-core super block */
838 static const arg_desc_t balloc[] = {
839 {"noborder", 1 << REISERFS_NO_BORDER, 0},
840 {"border", 0, 1 << REISERFS_NO_BORDER},
841 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
842 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
843 {"test4", 1 << REISERFS_TEST4, 0},
844 {"notest4", 0, 1 << REISERFS_TEST4},
845 {NULL, 0, 0}
846 };
847
848 static const arg_desc_t tails[] = {
849 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
850 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
851 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
852 {NULL, 0, 0}
853 };
854
855 static const arg_desc_t error_actions[] = {
856 {"panic", 1 << REISERFS_ERROR_PANIC,
857 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
858 {"ro-remount", 1 << REISERFS_ERROR_RO,
859 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
860 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
861 {"continue", 1 << REISERFS_ERROR_CONTINUE,
862 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
863 #endif
864 {NULL, 0, 0},
865 };
866
867 /* proceed only one option from a list *cur - string containing of mount options
868 opts - array of options which are accepted
869 opt_arg - if option is found and requires an argument and if it is specifed
870 in the input - pointer to the argument is stored here
871 bit_flags - if option requires to set a certain bit - it is set here
872 return -1 if unknown option is found, opt->arg_required otherwise */
873 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
874 char **opt_arg, unsigned long *bit_flags)
875 {
876 char *p;
877 /* foo=bar,
878 ^ ^ ^
879 | | +-- option_end
880 | +-- arg_start
881 +-- option_start
882 */
883 const opt_desc_t *opt;
884 const arg_desc_t *arg;
885
886 p = *cur;
887
888 /* assume argument cannot contain commas */
889 *cur = strchr(p, ',');
890 if (*cur) {
891 *(*cur) = '\0';
892 (*cur)++;
893 }
894
895 if (!strncmp(p, "alloc=", 6)) {
896 /* Ugly special case, probably we should redo options parser so that
897 it can understand several arguments for some options, also so that
898 it can fill several bitfields with option values. */
899 if (reiserfs_parse_alloc_options(s, p + 6)) {
900 return -1;
901 } else {
902 return 0;
903 }
904 }
905
906 /* for every option in the list */
907 for (opt = opts; opt->option_name; opt++) {
908 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
909 if (bit_flags) {
910 if (opt->clrmask ==
911 (1 << REISERFS_UNSUPPORTED_OPT))
912 reiserfs_warning(s, "super-6500",
913 "%s not supported.\n",
914 p);
915 else
916 *bit_flags &= ~opt->clrmask;
917 if (opt->setmask ==
918 (1 << REISERFS_UNSUPPORTED_OPT))
919 reiserfs_warning(s, "super-6501",
920 "%s not supported.\n",
921 p);
922 else
923 *bit_flags |= opt->setmask;
924 }
925 break;
926 }
927 }
928 if (!opt->option_name) {
929 reiserfs_warning(s, "super-6502",
930 "unknown mount option \"%s\"", p);
931 return -1;
932 }
933
934 p += strlen(opt->option_name);
935 switch (*p) {
936 case '=':
937 if (!opt->arg_required) {
938 reiserfs_warning(s, "super-6503",
939 "the option \"%s\" does not "
940 "require an argument\n",
941 opt->option_name);
942 return -1;
943 }
944 break;
945
946 case 0:
947 if (opt->arg_required) {
948 reiserfs_warning(s, "super-6504",
949 "the option \"%s\" requires an "
950 "argument\n", opt->option_name);
951 return -1;
952 }
953 break;
954 default:
955 reiserfs_warning(s, "super-6505",
956 "head of option \"%s\" is only correct\n",
957 opt->option_name);
958 return -1;
959 }
960
961 /* move to the argument, or to next option if argument is not required */
962 p++;
963
964 if (opt->arg_required
965 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
966 && !strlen(p)) {
967 /* this catches "option=," if not allowed */
968 reiserfs_warning(s, "super-6506",
969 "empty argument for \"%s\"\n",
970 opt->option_name);
971 return -1;
972 }
973
974 if (!opt->values) {
975 /* *=NULLopt_arg contains pointer to argument */
976 *opt_arg = p;
977 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
978 }
979
980 /* values possible for this option are listed in opt->values */
981 for (arg = opt->values; arg->value; arg++) {
982 if (!strcmp(p, arg->value)) {
983 if (bit_flags) {
984 *bit_flags &= ~arg->clrmask;
985 *bit_flags |= arg->setmask;
986 }
987 return opt->arg_required;
988 }
989 }
990
991 reiserfs_warning(s, "super-6506",
992 "bad value \"%s\" for option \"%s\"\n", p,
993 opt->option_name);
994 return -1;
995 }
996
997 /* returns 0 if something is wrong in option string, 1 - otherwise */
998 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
999 unsigned long *mount_options,
1000 /* after the parsing phase, contains the
1001 collection of bitflags defining what
1002 mount options were selected. */
1003 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
1004 char **jdev_name,
1005 unsigned int *commit_max_age,
1006 char **qf_names,
1007 unsigned int *qfmt)
1008 {
1009 int c;
1010 char *arg = NULL;
1011 char *pos;
1012 opt_desc_t opts[] = {
1013 /* Compatibility stuff, so that -o notail for old setups still work */
1014 {"tails",.arg_required = 't',.values = tails},
1015 {"notail",.clrmask =
1016 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1017 {"conv",.setmask = 1 << REISERFS_CONVERT},
1018 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1019 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1020 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1021 #ifdef CONFIG_REISERFS_FS_XATTR
1022 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1023 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1024 #else
1025 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 #endif
1028 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1029 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1030 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1031 #else
1032 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034 #endif
1035 {.option_name = "nolog"},
1036 {"replayonly",.setmask = 1 << REPLAYONLY},
1037 {"block-allocator",.arg_required = 'a',.values = balloc},
1038 {"data",.arg_required = 'd',.values = logging_mode},
1039 {"barrier",.arg_required = 'b',.values = barrier_mode},
1040 {"resize",.arg_required = 'r',.values = NULL},
1041 {"jdev",.arg_required = 'j',.values = NULL},
1042 {"nolargeio",.arg_required = 'w',.values = NULL},
1043 {"commit",.arg_required = 'c',.values = NULL},
1044 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1045 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1046 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1047 {"errors",.arg_required = 'e',.values = error_actions},
1048 {"usrjquota",.arg_required =
1049 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050 {"grpjquota",.arg_required =
1051 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1052 {"jqfmt",.arg_required = 'f',.values = NULL},
1053 {.option_name = NULL}
1054 };
1055
1056 *blocks = 0;
1057 if (!options || !*options)
1058 /* use default configuration: create tails, journaling on, no
1059 conversion to newest format */
1060 return 1;
1061
1062 for (pos = options; pos;) {
1063 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1064 if (c == -1)
1065 /* wrong option is given */
1066 return 0;
1067
1068 if (c == 'r') {
1069 char *p;
1070
1071 p = NULL;
1072 /* "resize=NNN" or "resize=auto" */
1073
1074 if (!strcmp(arg, "auto")) {
1075 /* From JFS code, to auto-get the size. */
1076 *blocks =
1077 s->s_bdev->bd_inode->i_size >> s->
1078 s_blocksize_bits;
1079 } else {
1080 *blocks = simple_strtoul(arg, &p, 0);
1081 if (*p != '\0') {
1082 /* NNN does not look like a number */
1083 reiserfs_warning(s, "super-6507",
1084 "bad value %s for "
1085 "-oresize\n", arg);
1086 return 0;
1087 }
1088 }
1089 }
1090
1091 if (c == 'c') {
1092 char *p = NULL;
1093 unsigned long val = simple_strtoul(arg, &p, 0);
1094 /* commit=NNN (time in seconds) */
1095 if (*p != '\0' || val >= (unsigned int)-1) {
1096 reiserfs_warning(s, "super-6508",
1097 "bad value %s for -ocommit\n",
1098 arg);
1099 return 0;
1100 }
1101 *commit_max_age = (unsigned int)val;
1102 }
1103
1104 if (c == 'w') {
1105 reiserfs_warning(s, "super-6509", "nolargeio option "
1106 "is no longer supported");
1107 return 0;
1108 }
1109
1110 if (c == 'j') {
1111 if (arg && *arg && jdev_name) {
1112 if (*jdev_name) { //Hm, already assigned?
1113 reiserfs_warning(s, "super-6510",
1114 "journal device was "
1115 "already specified to "
1116 "be %s", *jdev_name);
1117 return 0;
1118 }
1119 *jdev_name = arg;
1120 }
1121 }
1122 #ifdef CONFIG_QUOTA
1123 if (c == 'u' || c == 'g') {
1124 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1125
1126 if (sb_any_quota_loaded(s) &&
1127 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1128 reiserfs_warning(s, "super-6511",
1129 "cannot change journaled "
1130 "quota options when quota "
1131 "turned on.");
1132 return 0;
1133 }
1134 if (*arg) { /* Some filename specified? */
1135 if (REISERFS_SB(s)->s_qf_names[qtype]
1136 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1137 arg)) {
1138 reiserfs_warning(s, "super-6512",
1139 "%s quota file "
1140 "already specified.",
1141 QTYPE2NAME(qtype));
1142 return 0;
1143 }
1144 if (strchr(arg, '/')) {
1145 reiserfs_warning(s, "super-6513",
1146 "quotafile must be "
1147 "on filesystem root.");
1148 return 0;
1149 }
1150 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1151 if (!qf_names[qtype]) {
1152 reiserfs_warning(s, "reiserfs-2502",
1153 "not enough memory "
1154 "for storing "
1155 "quotafile name.");
1156 return 0;
1157 }
1158 if (qtype == USRQUOTA)
1159 *mount_options |= 1 << REISERFS_USRQUOTA;
1160 else
1161 *mount_options |= 1 << REISERFS_GRPQUOTA;
1162 } else {
1163 if (qf_names[qtype] !=
1164 REISERFS_SB(s)->s_qf_names[qtype])
1165 kfree(qf_names[qtype]);
1166 qf_names[qtype] = NULL;
1167 if (qtype == USRQUOTA)
1168 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1169 else
1170 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1171 }
1172 }
1173 if (c == 'f') {
1174 if (!strcmp(arg, "vfsold"))
1175 *qfmt = QFMT_VFS_OLD;
1176 else if (!strcmp(arg, "vfsv0"))
1177 *qfmt = QFMT_VFS_V0;
1178 else {
1179 reiserfs_warning(s, "super-6514",
1180 "unknown quota format "
1181 "specified.");
1182 return 0;
1183 }
1184 if (sb_any_quota_loaded(s) &&
1185 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1186 reiserfs_warning(s, "super-6515",
1187 "cannot change journaled "
1188 "quota options when quota "
1189 "turned on.");
1190 return 0;
1191 }
1192 }
1193 #else
1194 if (c == 'u' || c == 'g' || c == 'f') {
1195 reiserfs_warning(s, "reiserfs-2503", "journaled "
1196 "quota options not supported.");
1197 return 0;
1198 }
1199 #endif
1200 }
1201
1202 #ifdef CONFIG_QUOTA
1203 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1204 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1205 reiserfs_warning(s, "super-6515",
1206 "journaled quota format not specified.");
1207 return 0;
1208 }
1209 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1210 sb_has_quota_loaded(s, USRQUOTA)) ||
1211 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1212 sb_has_quota_loaded(s, GRPQUOTA))) {
1213 reiserfs_warning(s, "super-6516", "quota options must "
1214 "be present when quota is turned on.");
1215 return 0;
1216 }
1217 #endif
1218
1219 return 1;
1220 }
1221
1222 static void switch_data_mode(struct super_block *s, unsigned long mode)
1223 {
1224 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1225 (1 << REISERFS_DATA_ORDERED) |
1226 (1 << REISERFS_DATA_WRITEBACK));
1227 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1228 }
1229
1230 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1231 {
1232 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1233 if (!reiserfs_data_log(s)) {
1234 switch_data_mode(s, REISERFS_DATA_LOG);
1235 reiserfs_info(s, "switching to journaled data mode\n");
1236 }
1237 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1238 if (!reiserfs_data_ordered(s)) {
1239 switch_data_mode(s, REISERFS_DATA_ORDERED);
1240 reiserfs_info(s, "switching to ordered data mode\n");
1241 }
1242 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1243 if (!reiserfs_data_writeback(s)) {
1244 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1245 reiserfs_info(s, "switching to writeback data mode\n");
1246 }
1247 }
1248 }
1249
1250 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1251 {
1252 int flush = (1 << REISERFS_BARRIER_FLUSH);
1253 int none = (1 << REISERFS_BARRIER_NONE);
1254 int all_barrier = flush | none;
1255
1256 if (bits & all_barrier) {
1257 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1258 if (bits & flush) {
1259 REISERFS_SB(s)->s_mount_opt |= flush;
1260 printk("reiserfs: enabling write barrier flush mode\n");
1261 } else if (bits & none) {
1262 REISERFS_SB(s)->s_mount_opt |= none;
1263 printk("reiserfs: write barriers turned off\n");
1264 }
1265 }
1266 }
1267
1268 static void handle_attrs(struct super_block *s)
1269 {
1270 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1271
1272 if (reiserfs_attrs(s)) {
1273 if (old_format_only(s)) {
1274 reiserfs_warning(s, "super-6517", "cannot support "
1275 "attributes on 3.5.x disk format");
1276 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1277 return;
1278 }
1279 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1280 reiserfs_warning(s, "super-6518", "cannot support "
1281 "attributes until flag is set in "
1282 "super-block");
1283 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1284 }
1285 }
1286 }
1287
1288 #ifdef CONFIG_QUOTA
1289 static void handle_quota_files(struct super_block *s, char **qf_names,
1290 unsigned int *qfmt)
1291 {
1292 int i;
1293
1294 for (i = 0; i < MAXQUOTAS; i++) {
1295 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1296 kfree(REISERFS_SB(s)->s_qf_names[i]);
1297 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1298 }
1299 if (*qfmt)
1300 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1301 }
1302 #endif
1303
1304 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1305 {
1306 struct reiserfs_super_block *rs;
1307 struct reiserfs_transaction_handle th;
1308 unsigned long blocks;
1309 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1310 unsigned long safe_mask = 0;
1311 unsigned int commit_max_age = (unsigned int)-1;
1312 struct reiserfs_journal *journal = SB_JOURNAL(s);
1313 char *new_opts = kstrdup(arg, GFP_KERNEL);
1314 int err;
1315 char *qf_names[MAXQUOTAS];
1316 unsigned int qfmt = 0;
1317 #ifdef CONFIG_QUOTA
1318 int i;
1319 #endif
1320
1321 sync_filesystem(s);
1322 reiserfs_write_lock(s);
1323
1324 #ifdef CONFIG_QUOTA
1325 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1326 #endif
1327
1328 rs = SB_DISK_SUPER_BLOCK(s);
1329
1330 if (!reiserfs_parse_options
1331 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1332 qf_names, &qfmt)) {
1333 #ifdef CONFIG_QUOTA
1334 for (i = 0; i < MAXQUOTAS; i++)
1335 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1336 kfree(qf_names[i]);
1337 #endif
1338 err = -EINVAL;
1339 goto out_err_unlock;
1340 }
1341 #ifdef CONFIG_QUOTA
1342 handle_quota_files(s, qf_names, &qfmt);
1343 #endif
1344
1345 handle_attrs(s);
1346
1347 /* Add options that are safe here */
1348 safe_mask |= 1 << REISERFS_SMALLTAIL;
1349 safe_mask |= 1 << REISERFS_LARGETAIL;
1350 safe_mask |= 1 << REISERFS_NO_BORDER;
1351 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1352 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1353 safe_mask |= 1 << REISERFS_TEST4;
1354 safe_mask |= 1 << REISERFS_ATTRS;
1355 safe_mask |= 1 << REISERFS_XATTRS_USER;
1356 safe_mask |= 1 << REISERFS_POSIXACL;
1357 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1358 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1359 safe_mask |= 1 << REISERFS_ERROR_RO;
1360 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1361 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1362 safe_mask |= 1 << REISERFS_USRQUOTA;
1363 safe_mask |= 1 << REISERFS_GRPQUOTA;
1364
1365 /* Update the bitmask, taking care to keep
1366 * the bits we're not allowed to change here */
1367 REISERFS_SB(s)->s_mount_opt =
1368 (REISERFS_SB(s)->
1369 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1370
1371 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1372 journal->j_max_commit_age = commit_max_age;
1373 journal->j_max_trans_age = commit_max_age;
1374 } else if (commit_max_age == 0) {
1375 /* 0 means restore defaults. */
1376 journal->j_max_commit_age = journal->j_default_max_commit_age;
1377 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1378 }
1379
1380 if (blocks) {
1381 err = reiserfs_resize(s, blocks);
1382 if (err != 0)
1383 goto out_err_unlock;
1384 }
1385
1386 if (*mount_flags & MS_RDONLY) {
1387 reiserfs_write_unlock(s);
1388 reiserfs_xattr_init(s, *mount_flags);
1389 /* remount read-only */
1390 if (s->s_flags & MS_RDONLY)
1391 /* it is read-only already */
1392 goto out_ok_unlocked;
1393
1394 err = dquot_suspend(s, -1);
1395 if (err < 0)
1396 goto out_err;
1397
1398 /* try to remount file system with read-only permissions */
1399 if (sb_umount_state(rs) == REISERFS_VALID_FS
1400 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1401 goto out_ok_unlocked;
1402 }
1403
1404 reiserfs_write_lock(s);
1405
1406 err = journal_begin(&th, s, 10);
1407 if (err)
1408 goto out_err_unlock;
1409
1410 /* Mounting a rw partition read-only. */
1411 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1412 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1413 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1414 } else {
1415 /* remount read-write */
1416 if (!(s->s_flags & MS_RDONLY)) {
1417 reiserfs_write_unlock(s);
1418 reiserfs_xattr_init(s, *mount_flags);
1419 goto out_ok_unlocked; /* We are read-write already */
1420 }
1421
1422 if (reiserfs_is_journal_aborted(journal)) {
1423 err = journal->j_errno;
1424 goto out_err_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_err_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_err_unlock;
1451
1452 reiserfs_write_unlock(s);
1453 if (!(*mount_flags & MS_RDONLY)) {
1454 dquot_resume(s, -1);
1455 reiserfs_write_lock(s);
1456 finish_unfinished(s);
1457 reiserfs_write_unlock(s);
1458 reiserfs_xattr_init(s, *mount_flags);
1459 }
1460
1461 out_ok_unlocked:
1462 replace_mount_options(s, new_opts);
1463 return 0;
1464
1465 out_err_unlock:
1466 reiserfs_write_unlock(s);
1467 out_err:
1468 kfree(new_opts);
1469 return err;
1470 }
1471
1472 static int read_super_block(struct super_block *s, int offset)
1473 {
1474 struct buffer_head *bh;
1475 struct reiserfs_super_block *rs;
1476 int fs_blocksize;
1477
1478 bh = sb_bread(s, offset / s->s_blocksize);
1479 if (!bh) {
1480 reiserfs_warning(s, "sh-2006",
1481 "bread failed (dev %s, block %lu, size %lu)",
1482 s->s_id, offset / s->s_blocksize,
1483 s->s_blocksize);
1484 return 1;
1485 }
1486
1487 rs = (struct reiserfs_super_block *)bh->b_data;
1488 if (!is_any_reiserfs_magic_string(rs)) {
1489 brelse(bh);
1490 return 1;
1491 }
1492 //
1493 // ok, reiserfs signature (old or new) found in at the given offset
1494 //
1495 fs_blocksize = sb_blocksize(rs);
1496 brelse(bh);
1497 sb_set_blocksize(s, fs_blocksize);
1498
1499 bh = sb_bread(s, offset / s->s_blocksize);
1500 if (!bh) {
1501 reiserfs_warning(s, "sh-2007",
1502 "bread failed (dev %s, block %lu, size %lu)",
1503 s->s_id, offset / s->s_blocksize,
1504 s->s_blocksize);
1505 return 1;
1506 }
1507
1508 rs = (struct reiserfs_super_block *)bh->b_data;
1509 if (sb_blocksize(rs) != s->s_blocksize) {
1510 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1511 "filesystem on (dev %s, block %Lu, size %lu)",
1512 s->s_id,
1513 (unsigned long long)bh->b_blocknr,
1514 s->s_blocksize);
1515 brelse(bh);
1516 return 1;
1517 }
1518
1519 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1520 brelse(bh);
1521 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1522 "--rebuild-tree run detected. Please run\n"
1523 "reiserfsck --rebuild-tree and wait for a "
1524 "completion. If that fails\n"
1525 "get newer reiserfsprogs package");
1526 return 1;
1527 }
1528
1529 SB_BUFFER_WITH_SB(s) = bh;
1530 SB_DISK_SUPER_BLOCK(s) = rs;
1531
1532 if (is_reiserfs_jr(rs)) {
1533 /* magic is of non-standard journal filesystem, look at s_version to
1534 find which format is in use */
1535 if (sb_version(rs) == REISERFS_VERSION_2)
1536 reiserfs_info(s, "found reiserfs format \"3.6\""
1537 " with non-standard journal\n");
1538 else if (sb_version(rs) == REISERFS_VERSION_1)
1539 reiserfs_info(s, "found reiserfs format \"3.5\""
1540 " with non-standard journal\n");
1541 else {
1542 reiserfs_warning(s, "sh-2012", "found unknown "
1543 "format \"%u\" of reiserfs with "
1544 "non-standard magic", sb_version(rs));
1545 return 1;
1546 }
1547 } else
1548 /* s_version of standard format may contain incorrect information,
1549 so we just look at the magic string */
1550 reiserfs_info(s,
1551 "found reiserfs format \"%s\" with standard journal\n",
1552 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1553
1554 s->s_op = &reiserfs_sops;
1555 s->s_export_op = &reiserfs_export_ops;
1556 #ifdef CONFIG_QUOTA
1557 s->s_qcop = &reiserfs_qctl_operations;
1558 s->dq_op = &reiserfs_quota_operations;
1559 #endif
1560
1561 /* new format is limited by the 32 bit wide i_blocks field, want to
1562 ** be one full block below that.
1563 */
1564 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1565 return 0;
1566 }
1567
1568 /* after journal replay, reread all bitmap and super blocks */
1569 static int reread_meta_blocks(struct super_block *s)
1570 {
1571 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1572 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1573 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1574 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1575 return 1;
1576 }
1577
1578 return 0;
1579 }
1580
1581 /////////////////////////////////////////////////////
1582 // hash detection stuff
1583
1584 // if root directory is empty - we set default - Yura's - hash and
1585 // warn about it
1586 // FIXME: we look for only one name in a directory. If tea and yura
1587 // bith have the same value - we ask user to send report to the
1588 // mailing list
1589 static __u32 find_hash_out(struct super_block *s)
1590 {
1591 int retval;
1592 struct inode *inode;
1593 struct cpu_key key;
1594 INITIALIZE_PATH(path);
1595 struct reiserfs_dir_entry de;
1596 __u32 hash = DEFAULT_HASH;
1597
1598 inode = s->s_root->d_inode;
1599
1600 do { // Some serious "goto"-hater was there ;)
1601 u32 teahash, r5hash, yurahash;
1602
1603 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1604 retval = search_by_entry_key(s, &key, &path, &de);
1605 if (retval == IO_ERROR) {
1606 pathrelse(&path);
1607 return UNSET_HASH;
1608 }
1609 if (retval == NAME_NOT_FOUND)
1610 de.de_entry_num--;
1611 set_de_name_and_namelen(&de);
1612 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1613 /* allow override in this case */
1614 if (reiserfs_rupasov_hash(s)) {
1615 hash = YURA_HASH;
1616 }
1617 reiserfs_info(s, "FS seems to be empty, autodetect "
1618 "is using the default hash\n");
1619 break;
1620 }
1621 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1622 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1623 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1624 if (((teahash == r5hash)
1625 &&
1626 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1627 == r5hash)) || ((teahash == yurahash)
1628 && (yurahash ==
1629 GET_HASH_VALUE(deh_offset
1630 (&
1631 (de.
1632 de_deh[de.
1633 de_entry_num])))))
1634 || ((r5hash == yurahash)
1635 && (yurahash ==
1636 GET_HASH_VALUE(deh_offset
1637 (&(de.de_deh[de.de_entry_num])))))) {
1638 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1639 "automatically detect hash function. "
1640 "Please mount with -o "
1641 "hash={tea,rupasov,r5}");
1642 hash = UNSET_HASH;
1643 break;
1644 }
1645 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1646 yurahash)
1647 hash = YURA_HASH;
1648 else if (GET_HASH_VALUE
1649 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1650 hash = TEA_HASH;
1651 else if (GET_HASH_VALUE
1652 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1653 hash = R5_HASH;
1654 else {
1655 reiserfs_warning(s, "reiserfs-2506",
1656 "Unrecognised hash function");
1657 hash = UNSET_HASH;
1658 }
1659 } while (0);
1660
1661 pathrelse(&path);
1662 return hash;
1663 }
1664
1665 // finds out which hash names are sorted with
1666 static int what_hash(struct super_block *s)
1667 {
1668 __u32 code;
1669
1670 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1671
1672 /* reiserfs_hash_detect() == true if any of the hash mount options
1673 ** were used. We must check them to make sure the user isn't
1674 ** using a bad hash value
1675 */
1676 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1677 code = find_hash_out(s);
1678
1679 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1680 /* detection has found the hash, and we must check against the
1681 ** mount options
1682 */
1683 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1684 reiserfs_warning(s, "reiserfs-2507",
1685 "Error, %s hash detected, "
1686 "unable to force rupasov hash",
1687 reiserfs_hashname(code));
1688 code = UNSET_HASH;
1689 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1690 reiserfs_warning(s, "reiserfs-2508",
1691 "Error, %s hash detected, "
1692 "unable to force tea hash",
1693 reiserfs_hashname(code));
1694 code = UNSET_HASH;
1695 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1696 reiserfs_warning(s, "reiserfs-2509",
1697 "Error, %s hash detected, "
1698 "unable to force r5 hash",
1699 reiserfs_hashname(code));
1700 code = UNSET_HASH;
1701 }
1702 } else {
1703 /* find_hash_out was not called or could not determine the hash */
1704 if (reiserfs_rupasov_hash(s)) {
1705 code = YURA_HASH;
1706 } else if (reiserfs_tea_hash(s)) {
1707 code = TEA_HASH;
1708 } else if (reiserfs_r5_hash(s)) {
1709 code = R5_HASH;
1710 }
1711 }
1712
1713 /* if we are mounted RW, and we have a new valid hash code, update
1714 ** the super
1715 */
1716 if (code != UNSET_HASH &&
1717 !(s->s_flags & MS_RDONLY) &&
1718 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1719 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1720 }
1721 return code;
1722 }
1723
1724 // return pointer to appropriate function
1725 static hashf_t hash_function(struct super_block *s)
1726 {
1727 switch (what_hash(s)) {
1728 case TEA_HASH:
1729 reiserfs_info(s, "Using tea hash to sort names\n");
1730 return keyed_hash;
1731 case YURA_HASH:
1732 reiserfs_info(s, "Using rupasov hash to sort names\n");
1733 return yura_hash;
1734 case R5_HASH:
1735 reiserfs_info(s, "Using r5 hash to sort names\n");
1736 return r5_hash;
1737 }
1738 return NULL;
1739 }
1740
1741 // this is used to set up correct value for old partitions
1742 static int function2code(hashf_t func)
1743 {
1744 if (func == keyed_hash)
1745 return TEA_HASH;
1746 if (func == yura_hash)
1747 return YURA_HASH;
1748 if (func == r5_hash)
1749 return R5_HASH;
1750
1751 BUG(); // should never happen
1752
1753 return 0;
1754 }
1755
1756 #define SWARN(silent, s, id, ...) \
1757 if (!(silent)) \
1758 reiserfs_warning(s, id, __VA_ARGS__)
1759
1760 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1761 {
1762 struct inode *root_inode;
1763 struct reiserfs_transaction_handle th;
1764 int old_format = 0;
1765 unsigned long blocks;
1766 unsigned int commit_max_age = 0;
1767 int jinit_done = 0;
1768 struct reiserfs_iget_args args;
1769 struct reiserfs_super_block *rs;
1770 char *jdev_name;
1771 struct reiserfs_sb_info *sbi;
1772 int errval = -EINVAL;
1773 char *qf_names[MAXQUOTAS] = {};
1774 unsigned int qfmt = 0;
1775
1776 save_mount_options(s, data);
1777
1778 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1779 if (!sbi)
1780 return -ENOMEM;
1781 s->s_fs_info = sbi;
1782 /* Set default values for options: non-aggressive tails, RO on errors */
1783 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1784 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1785 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1786 /* no preallocation minimum, be smart in
1787 reiserfs_file_write instead */
1788 sbi->s_alloc_options.preallocmin = 0;
1789 /* Preallocate by 16 blocks (17-1) at once */
1790 sbi->s_alloc_options.preallocsize = 17;
1791 /* setup default block allocator options */
1792 reiserfs_init_alloc_options(s);
1793
1794 spin_lock_init(&sbi->old_work_lock);
1795 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1796 mutex_init(&sbi->lock);
1797 sbi->lock_depth = -1;
1798
1799 jdev_name = NULL;
1800 if (reiserfs_parse_options
1801 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1802 &commit_max_age, qf_names, &qfmt) == 0) {
1803 goto error_unlocked;
1804 }
1805 if (jdev_name && jdev_name[0]) {
1806 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1807 if (!sbi->s_jdev) {
1808 SWARN(silent, s, "", "Cannot allocate memory for "
1809 "journal device name");
1810 goto error;
1811 }
1812 }
1813 #ifdef CONFIG_QUOTA
1814 handle_quota_files(s, qf_names, &qfmt);
1815 #endif
1816
1817 if (blocks) {
1818 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1819 goto error_unlocked;
1820 }
1821
1822 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1823 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1824 old_format = 1;
1825 /* try new format (64-th 1k block), which can contain reiserfs super block */
1826 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1827 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1828 s->s_id);
1829 goto error_unlocked;
1830 }
1831
1832 rs = SB_DISK_SUPER_BLOCK(s);
1833 /* Let's do basic sanity check to verify that underlying device is not
1834 smaller than the filesystem. If the check fails then abort and scream,
1835 because bad stuff will happen otherwise. */
1836 if (s->s_bdev && s->s_bdev->bd_inode
1837 && i_size_read(s->s_bdev->bd_inode) <
1838 sb_block_count(rs) * sb_blocksize(rs)) {
1839 SWARN(silent, s, "", "Filesystem cannot be "
1840 "mounted because it is bigger than the device");
1841 SWARN(silent, s, "", "You may need to run fsck "
1842 "or increase size of your LVM partition");
1843 SWARN(silent, s, "", "Or may be you forgot to "
1844 "reboot after fdisk when it told you to");
1845 goto error_unlocked;
1846 }
1847
1848 sbi->s_mount_state = SB_REISERFS_STATE(s);
1849 sbi->s_mount_state = REISERFS_VALID_FS;
1850
1851 if ((errval = reiserfs_init_bitmap_cache(s))) {
1852 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1853 goto error_unlocked;
1854 }
1855
1856 errval = -EINVAL;
1857 #ifdef CONFIG_REISERFS_CHECK
1858 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1859 SWARN(silent, s, "", "- it is slow mode for debugging.");
1860 #endif
1861
1862 /* make data=ordered the default */
1863 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1864 !reiserfs_data_writeback(s)) {
1865 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1866 }
1867
1868 if (reiserfs_data_log(s)) {
1869 reiserfs_info(s, "using journaled data mode\n");
1870 } else if (reiserfs_data_ordered(s)) {
1871 reiserfs_info(s, "using ordered data mode\n");
1872 } else {
1873 reiserfs_info(s, "using writeback data mode\n");
1874 }
1875 if (reiserfs_barrier_flush(s)) {
1876 printk("reiserfs: using flush barriers\n");
1877 }
1878
1879 // set_device_ro(s->s_dev, 1) ;
1880 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1881 SWARN(silent, s, "sh-2022",
1882 "unable to initialize journal space");
1883 goto error_unlocked;
1884 } else {
1885 jinit_done = 1; /* once this is set, journal_release must be called
1886 ** if we error out of the mount
1887 */
1888 }
1889
1890 if (reread_meta_blocks(s)) {
1891 SWARN(silent, s, "jmacd-9",
1892 "unable to reread meta blocks after journal init");
1893 goto error_unlocked;
1894 }
1895
1896 if (replay_only(s))
1897 goto error_unlocked;
1898
1899 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1900 SWARN(silent, s, "clm-7000",
1901 "Detected readonly device, marking FS readonly");
1902 s->s_flags |= MS_RDONLY;
1903 }
1904 args.objectid = REISERFS_ROOT_OBJECTID;
1905 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1906 root_inode =
1907 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1908 reiserfs_init_locked_inode, (void *)(&args));
1909 if (!root_inode) {
1910 SWARN(silent, s, "jmacd-10", "get root inode failed");
1911 goto error_unlocked;
1912 }
1913
1914 /*
1915 * This path assumed to be called with the BKL in the old times.
1916 * Now we have inherited the big reiserfs lock from it and many
1917 * reiserfs helpers called in the mount path and elsewhere require
1918 * this lock to be held even if it's not always necessary. Let's be
1919 * conservative and hold it early. The window can be reduced after
1920 * careful review of the code.
1921 */
1922 reiserfs_write_lock(s);
1923
1924 if (root_inode->i_state & I_NEW) {
1925 reiserfs_read_locked_inode(root_inode, &args);
1926 unlock_new_inode(root_inode);
1927 }
1928
1929 s->s_root = d_make_root(root_inode);
1930 if (!s->s_root)
1931 goto error;
1932 // define and initialize hash function
1933 sbi->s_hash_function = hash_function(s);
1934 if (sbi->s_hash_function == NULL) {
1935 dput(s->s_root);
1936 s->s_root = NULL;
1937 goto error;
1938 }
1939
1940 if (is_reiserfs_3_5(rs)
1941 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1942 set_bit(REISERFS_3_5, &(sbi->s_properties));
1943 else if (old_format)
1944 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1945 else
1946 set_bit(REISERFS_3_6, &(sbi->s_properties));
1947
1948 if (!(s->s_flags & MS_RDONLY)) {
1949
1950 errval = journal_begin(&th, s, 1);
1951 if (errval) {
1952 dput(s->s_root);
1953 s->s_root = NULL;
1954 goto error;
1955 }
1956 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1957
1958 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1959 set_sb_fs_state(rs, 0);
1960
1961 /* Clear out s_bmap_nr if it would wrap. We can handle this
1962 * case, but older revisions can't. This will cause the
1963 * file system to fail mount on those older implementations,
1964 * avoiding corruption. -jeffm */
1965 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1966 sb_bmap_nr(rs) != 0) {
1967 reiserfs_warning(s, "super-2030", "This file system "
1968 "claims to use %u bitmap blocks in "
1969 "its super block, but requires %u. "
1970 "Clearing to zero.", sb_bmap_nr(rs),
1971 reiserfs_bmap_count(s));
1972
1973 set_sb_bmap_nr(rs, 0);
1974 }
1975
1976 if (old_format_only(s)) {
1977 /* filesystem of format 3.5 either with standard or non-standard
1978 journal */
1979 if (convert_reiserfs(s)) {
1980 /* and -o conv is given */
1981 if (!silent)
1982 reiserfs_info(s,
1983 "converting 3.5 filesystem to the 3.6 format");
1984
1985 if (is_reiserfs_3_5(rs))
1986 /* put magic string of 3.6 format. 2.2 will not be able to
1987 mount this filesystem anymore */
1988 memcpy(rs->s_v1.s_magic,
1989 reiserfs_3_6_magic_string,
1990 sizeof
1991 (reiserfs_3_6_magic_string));
1992
1993 set_sb_version(rs, REISERFS_VERSION_2);
1994 reiserfs_convert_objectid_map_v1(s);
1995 set_bit(REISERFS_3_6, &(sbi->s_properties));
1996 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1997 } else if (!silent) {
1998 reiserfs_info(s, "using 3.5.x disk format\n");
1999 }
2000 } else
2001 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2002
2003
2004 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2005 errval = journal_end(&th, s, 1);
2006 if (errval) {
2007 dput(s->s_root);
2008 s->s_root = NULL;
2009 goto error;
2010 }
2011
2012 reiserfs_write_unlock(s);
2013 if ((errval = reiserfs_lookup_privroot(s)) ||
2014 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2015 dput(s->s_root);
2016 s->s_root = NULL;
2017 goto error_unlocked;
2018 }
2019 reiserfs_write_lock(s);
2020
2021 /* look for files which were to be removed in previous session */
2022 finish_unfinished(s);
2023 } else {
2024 if (old_format_only(s) && !silent) {
2025 reiserfs_info(s, "using 3.5.x disk format\n");
2026 }
2027
2028 reiserfs_write_unlock(s);
2029 if ((errval = reiserfs_lookup_privroot(s)) ||
2030 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2031 dput(s->s_root);
2032 s->s_root = NULL;
2033 goto error_unlocked;
2034 }
2035 reiserfs_write_lock(s);
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 int depth;
2104
2105 reiserfs_write_lock(dquot->dq_sb);
2106 ret =
2107 journal_begin(&th, dquot->dq_sb,
2108 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2109 if (ret)
2110 goto out;
2111 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2112 ret = dquot_commit(dquot);
2113 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2114 err =
2115 journal_end(&th, dquot->dq_sb,
2116 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2117 if (!ret && err)
2118 ret = err;
2119 out:
2120 reiserfs_write_unlock(dquot->dq_sb);
2121 return ret;
2122 }
2123
2124 static int reiserfs_acquire_dquot(struct dquot *dquot)
2125 {
2126 struct reiserfs_transaction_handle th;
2127 int ret, err;
2128 int depth;
2129
2130 reiserfs_write_lock(dquot->dq_sb);
2131 ret =
2132 journal_begin(&th, dquot->dq_sb,
2133 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2134 if (ret)
2135 goto out;
2136 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2137 ret = dquot_acquire(dquot);
2138 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2139 err =
2140 journal_end(&th, dquot->dq_sb,
2141 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2142 if (!ret && err)
2143 ret = err;
2144 out:
2145 reiserfs_write_unlock(dquot->dq_sb);
2146 return ret;
2147 }
2148
2149 static int reiserfs_release_dquot(struct dquot *dquot)
2150 {
2151 struct reiserfs_transaction_handle th;
2152 int ret, err;
2153
2154 reiserfs_write_lock(dquot->dq_sb);
2155 ret =
2156 journal_begin(&th, dquot->dq_sb,
2157 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2158 reiserfs_write_unlock(dquot->dq_sb);
2159 if (ret) {
2160 /* Release dquot anyway to avoid endless cycle in dqput() */
2161 dquot_release(dquot);
2162 goto out;
2163 }
2164 ret = dquot_release(dquot);
2165 reiserfs_write_lock(dquot->dq_sb);
2166 err =
2167 journal_end(&th, dquot->dq_sb,
2168 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2169 if (!ret && err)
2170 ret = err;
2171 reiserfs_write_unlock(dquot->dq_sb);
2172 out:
2173 return ret;
2174 }
2175
2176 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2177 {
2178 /* Are we journaling quotas? */
2179 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2180 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2181 dquot_mark_dquot_dirty(dquot);
2182 return reiserfs_write_dquot(dquot);
2183 } else
2184 return dquot_mark_dquot_dirty(dquot);
2185 }
2186
2187 static int reiserfs_write_info(struct super_block *sb, int type)
2188 {
2189 struct reiserfs_transaction_handle th;
2190 int ret, err;
2191 int depth;
2192
2193 /* Data block + inode block */
2194 reiserfs_write_lock(sb);
2195 ret = journal_begin(&th, sb, 2);
2196 if (ret)
2197 goto out;
2198 depth = reiserfs_write_unlock_nested(sb);
2199 ret = dquot_commit_info(sb, type);
2200 reiserfs_write_lock_nested(sb, depth);
2201 err = journal_end(&th, sb, 2);
2202 if (!ret && err)
2203 ret = err;
2204 out:
2205 reiserfs_write_unlock(sb);
2206 return ret;
2207 }
2208
2209 /*
2210 * Turn on quotas during mount time - we need to find the quota file and such...
2211 */
2212 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2213 {
2214 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2215 REISERFS_SB(sb)->s_jquota_fmt, type);
2216 }
2217
2218 /*
2219 * Standard function to be called on quota_on
2220 */
2221 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2222 struct path *path)
2223 {
2224 int err;
2225 struct inode *inode;
2226 struct reiserfs_transaction_handle th;
2227 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2228
2229 reiserfs_write_lock(sb);
2230 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2231 err = -EINVAL;
2232 goto out;
2233 }
2234
2235 /* Quotafile not on the same filesystem? */
2236 if (path->dentry->d_sb != sb) {
2237 err = -EXDEV;
2238 goto out;
2239 }
2240 inode = path->dentry->d_inode;
2241 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2242 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2243 err = reiserfs_unpack(inode, NULL);
2244 if (err) {
2245 reiserfs_warning(sb, "super-6520",
2246 "Unpacking tail of quota file failed"
2247 " (%d). Cannot turn on quotas.", err);
2248 err = -EINVAL;
2249 goto out;
2250 }
2251 mark_inode_dirty(inode);
2252 }
2253 /* Journaling quota? */
2254 if (REISERFS_SB(sb)->s_qf_names[type]) {
2255 /* Quotafile not of fs root? */
2256 if (path->dentry->d_parent != sb->s_root)
2257 reiserfs_warning(sb, "super-6521",
2258 "Quota file not on filesystem root. "
2259 "Journalled quota will not work.");
2260 }
2261
2262 /*
2263 * When we journal data on quota file, we have to flush journal to see
2264 * all updates to the file when we bypass pagecache...
2265 */
2266 if (reiserfs_file_data_log(inode)) {
2267 /* Just start temporary transaction and finish it */
2268 err = journal_begin(&th, sb, 1);
2269 if (err)
2270 goto out;
2271 err = journal_end_sync(&th, sb, 1);
2272 if (err)
2273 goto out;
2274 }
2275 reiserfs_write_unlock(sb);
2276 return dquot_quota_on(sb, type, format_id, path);
2277 out:
2278 reiserfs_write_unlock(sb);
2279 return err;
2280 }
2281
2282 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2283 * acquiring the locks... As quota files are never truncated and quota code
2284 * itself serializes the operations (and no one else should touch the files)
2285 * we don't have to be afraid of races */
2286 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2287 size_t len, loff_t off)
2288 {
2289 struct inode *inode = sb_dqopt(sb)->files[type];
2290 unsigned long blk = off >> sb->s_blocksize_bits;
2291 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2292 size_t toread;
2293 struct buffer_head tmp_bh, *bh;
2294 loff_t i_size = i_size_read(inode);
2295
2296 if (off > i_size)
2297 return 0;
2298 if (off + len > i_size)
2299 len = i_size - off;
2300 toread = len;
2301 while (toread > 0) {
2302 tocopy =
2303 sb->s_blocksize - offset <
2304 toread ? sb->s_blocksize - offset : toread;
2305 tmp_bh.b_state = 0;
2306 /* Quota files are without tails so we can safely use this function */
2307 reiserfs_write_lock(sb);
2308 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2309 reiserfs_write_unlock(sb);
2310 if (err)
2311 return err;
2312 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2313 memset(data, 0, tocopy);
2314 else {
2315 bh = sb_bread(sb, tmp_bh.b_blocknr);
2316 if (!bh)
2317 return -EIO;
2318 memcpy(data, bh->b_data + offset, tocopy);
2319 brelse(bh);
2320 }
2321 offset = 0;
2322 toread -= tocopy;
2323 data += tocopy;
2324 blk++;
2325 }
2326 return len;
2327 }
2328
2329 /* Write to quotafile (we know the transaction is already started and has
2330 * enough credits) */
2331 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2332 const char *data, size_t len, loff_t off)
2333 {
2334 struct inode *inode = sb_dqopt(sb)->files[type];
2335 unsigned long blk = off >> sb->s_blocksize_bits;
2336 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2337 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2338 size_t towrite = len;
2339 struct buffer_head tmp_bh, *bh;
2340
2341 if (!current->journal_info) {
2342 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2343 " cancelled because transaction is not started.\n",
2344 (unsigned long long)off, (unsigned long long)len);
2345 return -EIO;
2346 }
2347 while (towrite > 0) {
2348 tocopy = sb->s_blocksize - offset < towrite ?
2349 sb->s_blocksize - offset : towrite;
2350 tmp_bh.b_state = 0;
2351 reiserfs_write_lock(sb);
2352 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2353 reiserfs_write_unlock(sb);
2354 if (err)
2355 goto out;
2356 if (offset || tocopy != sb->s_blocksize)
2357 bh = sb_bread(sb, tmp_bh.b_blocknr);
2358 else
2359 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2360 if (!bh) {
2361 err = -EIO;
2362 goto out;
2363 }
2364 lock_buffer(bh);
2365 memcpy(bh->b_data + offset, data, tocopy);
2366 flush_dcache_page(bh->b_page);
2367 set_buffer_uptodate(bh);
2368 unlock_buffer(bh);
2369 reiserfs_write_lock(sb);
2370 reiserfs_prepare_for_journal(sb, bh, 1);
2371 journal_mark_dirty(current->journal_info, sb, bh);
2372 if (!journal_quota)
2373 reiserfs_add_ordered_list(inode, bh);
2374 reiserfs_write_unlock(sb);
2375 brelse(bh);
2376 offset = 0;
2377 towrite -= tocopy;
2378 data += tocopy;
2379 blk++;
2380 }
2381 out:
2382 if (len == towrite)
2383 return err;
2384 if (inode->i_size < off + len - towrite)
2385 i_size_write(inode, off + len - towrite);
2386 inode->i_version++;
2387 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2388 mark_inode_dirty(inode);
2389 return len - towrite;
2390 }
2391
2392 #endif
2393
2394 static struct dentry *get_super_block(struct file_system_type *fs_type,
2395 int flags, const char *dev_name,
2396 void *data)
2397 {
2398 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2399 }
2400
2401 static int __init init_reiserfs_fs(void)
2402 {
2403 int ret;
2404
2405 if ((ret = init_inodecache())) {
2406 return ret;
2407 }
2408
2409 reiserfs_proc_info_global_init();
2410
2411 ret = register_filesystem(&reiserfs_fs_type);
2412
2413 if (ret == 0) {
2414 return 0;
2415 }
2416
2417 reiserfs_proc_info_global_done();
2418 destroy_inodecache();
2419
2420 return ret;
2421 }
2422
2423 static void __exit exit_reiserfs_fs(void)
2424 {
2425 reiserfs_proc_info_global_done();
2426 unregister_filesystem(&reiserfs_fs_type);
2427 destroy_inodecache();
2428 }
2429
2430 struct file_system_type reiserfs_fs_type = {
2431 .owner = THIS_MODULE,
2432 .name = "reiserfs",
2433 .mount = get_super_block,
2434 .kill_sb = reiserfs_kill_sb,
2435 .fs_flags = FS_REQUIRES_DEV,
2436 };
2437 MODULE_ALIAS_FS("reiserfs");
2438
2439 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2440 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2441 MODULE_LICENSE("GPL");
2442
2443 module_init(init_reiserfs_fs);
2444 module_exit(exit_reiserfs_fs);
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