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Linux 3.8-rc7
[cris-mirror.git] / fs / reiserfs / super.c
blob418bdc3a57da4e11092477fa1b3cbf2e37f71422
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 /*
503 * Force any pending inode evictions to occur now. Any
504 * inodes to be removed that have extended attributes
505 * associated with them need to clean them up before
506 * we can release the extended attribute root dentries.
507 * shrink_dcache_for_umount will BUG if we don't release
508 * those before it's called so ->put_super is too late.
509 */
510 shrink_dcache_sb(s);
511
512 dput(REISERFS_SB(s)->xattr_root);
513 REISERFS_SB(s)->xattr_root = NULL;
514 dput(REISERFS_SB(s)->priv_root);
515 REISERFS_SB(s)->priv_root = NULL;
516 }
517
518 kill_block_super(s);
519 }
520
521 static void reiserfs_put_super(struct super_block *s)
522 {
523 struct reiserfs_transaction_handle th;
524 th.t_trans_id = 0;
525
526 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
527
528 reiserfs_write_lock(s);
529
530 /* change file system state to current state if it was mounted with read-write permissions */
531 if (!(s->s_flags & MS_RDONLY)) {
532 if (!journal_begin(&th, s, 10)) {
533 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
534 1);
535 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
536 REISERFS_SB(s)->s_mount_state);
537 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
538 }
539 }
540
541 /* note, journal_release checks for readonly mount, and can decide not
542 ** to do a journal_end
543 */
544 journal_release(&th, s);
545
546 reiserfs_free_bitmap_cache(s);
547
548 brelse(SB_BUFFER_WITH_SB(s));
549
550 print_statistics(s);
551
552 if (REISERFS_SB(s)->reserved_blocks != 0) {
553 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
554 REISERFS_SB(s)->reserved_blocks);
555 }
556
557 reiserfs_proc_info_done(s);
558
559 reiserfs_write_unlock(s);
560 mutex_destroy(&REISERFS_SB(s)->lock);
561 kfree(s->s_fs_info);
562 s->s_fs_info = NULL;
563 }
564
565 static struct kmem_cache *reiserfs_inode_cachep;
566
567 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
568 {
569 struct reiserfs_inode_info *ei;
570 ei = (struct reiserfs_inode_info *)
571 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
572 if (!ei)
573 return NULL;
574 atomic_set(&ei->openers, 0);
575 mutex_init(&ei->tailpack);
576 return &ei->vfs_inode;
577 }
578
579 static void reiserfs_i_callback(struct rcu_head *head)
580 {
581 struct inode *inode = container_of(head, struct inode, i_rcu);
582 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
583 }
584
585 static void reiserfs_destroy_inode(struct inode *inode)
586 {
587 call_rcu(&inode->i_rcu, reiserfs_i_callback);
588 }
589
590 static void init_once(void *foo)
591 {
592 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
593
594 INIT_LIST_HEAD(&ei->i_prealloc_list);
595 inode_init_once(&ei->vfs_inode);
596 }
597
598 static int init_inodecache(void)
599 {
600 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
601 sizeof(struct
602 reiserfs_inode_info),
603 0, (SLAB_RECLAIM_ACCOUNT|
604 SLAB_MEM_SPREAD),
605 init_once);
606 if (reiserfs_inode_cachep == NULL)
607 return -ENOMEM;
608 return 0;
609 }
610
611 static void destroy_inodecache(void)
612 {
613 /*
614 * Make sure all delayed rcu free inodes are flushed before we
615 * destroy cache.
616 */
617 rcu_barrier();
618 kmem_cache_destroy(reiserfs_inode_cachep);
619 }
620
621 /* we don't mark inodes dirty, we just log them */
622 static void reiserfs_dirty_inode(struct inode *inode, int flags)
623 {
624 struct reiserfs_transaction_handle th;
625
626 int err = 0;
627 int lock_depth;
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 lock_depth = reiserfs_write_lock_once(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_once(inode->i_sb, lock_depth);
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] =
1151 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1152 if (!qf_names[qtype]) {
1153 reiserfs_warning(s, "reiserfs-2502",
1154 "not enough memory "
1155 "for storing "
1156 "quotafile name.");
1157 return 0;
1158 }
1159 strcpy(qf_names[qtype], arg);
1160 if (qtype == USRQUOTA)
1161 *mount_options |= 1 << REISERFS_USRQUOTA;
1162 else
1163 *mount_options |= 1 << REISERFS_GRPQUOTA;
1164 } else {
1165 if (qf_names[qtype] !=
1166 REISERFS_SB(s)->s_qf_names[qtype])
1167 kfree(qf_names[qtype]);
1168 qf_names[qtype] = NULL;
1169 if (qtype == USRQUOTA)
1170 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1171 else
1172 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1173 }
1174 }
1175 if (c == 'f') {
1176 if (!strcmp(arg, "vfsold"))
1177 *qfmt = QFMT_VFS_OLD;
1178 else if (!strcmp(arg, "vfsv0"))
1179 *qfmt = QFMT_VFS_V0;
1180 else {
1181 reiserfs_warning(s, "super-6514",
1182 "unknown quota format "
1183 "specified.");
1184 return 0;
1185 }
1186 if (sb_any_quota_loaded(s) &&
1187 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1188 reiserfs_warning(s, "super-6515",
1189 "cannot change journaled "
1190 "quota options when quota "
1191 "turned on.");
1192 return 0;
1193 }
1194 }
1195 #else
1196 if (c == 'u' || c == 'g' || c == 'f') {
1197 reiserfs_warning(s, "reiserfs-2503", "journaled "
1198 "quota options not supported.");
1199 return 0;
1200 }
1201 #endif
1202 }
1203
1204 #ifdef CONFIG_QUOTA
1205 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1206 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1207 reiserfs_warning(s, "super-6515",
1208 "journaled quota format not specified.");
1209 return 0;
1210 }
1211 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1212 sb_has_quota_loaded(s, USRQUOTA)) ||
1213 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1214 sb_has_quota_loaded(s, GRPQUOTA))) {
1215 reiserfs_warning(s, "super-6516", "quota options must "
1216 "be present when quota is turned on.");
1217 return 0;
1218 }
1219 #endif
1220
1221 return 1;
1222 }
1223
1224 static void switch_data_mode(struct super_block *s, unsigned long mode)
1225 {
1226 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1227 (1 << REISERFS_DATA_ORDERED) |
1228 (1 << REISERFS_DATA_WRITEBACK));
1229 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1230 }
1231
1232 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1233 {
1234 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1235 if (!reiserfs_data_log(s)) {
1236 switch_data_mode(s, REISERFS_DATA_LOG);
1237 reiserfs_info(s, "switching to journaled data mode\n");
1238 }
1239 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1240 if (!reiserfs_data_ordered(s)) {
1241 switch_data_mode(s, REISERFS_DATA_ORDERED);
1242 reiserfs_info(s, "switching to ordered data mode\n");
1243 }
1244 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1245 if (!reiserfs_data_writeback(s)) {
1246 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1247 reiserfs_info(s, "switching to writeback data mode\n");
1248 }
1249 }
1250 }
1251
1252 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1253 {
1254 int flush = (1 << REISERFS_BARRIER_FLUSH);
1255 int none = (1 << REISERFS_BARRIER_NONE);
1256 int all_barrier = flush | none;
1257
1258 if (bits & all_barrier) {
1259 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1260 if (bits & flush) {
1261 REISERFS_SB(s)->s_mount_opt |= flush;
1262 printk("reiserfs: enabling write barrier flush mode\n");
1263 } else if (bits & none) {
1264 REISERFS_SB(s)->s_mount_opt |= none;
1265 printk("reiserfs: write barriers turned off\n");
1266 }
1267 }
1268 }
1269
1270 static void handle_attrs(struct super_block *s)
1271 {
1272 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1273
1274 if (reiserfs_attrs(s)) {
1275 if (old_format_only(s)) {
1276 reiserfs_warning(s, "super-6517", "cannot support "
1277 "attributes on 3.5.x disk format");
1278 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1279 return;
1280 }
1281 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1282 reiserfs_warning(s, "super-6518", "cannot support "
1283 "attributes until flag is set in "
1284 "super-block");
1285 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1286 }
1287 }
1288 }
1289
1290 #ifdef CONFIG_QUOTA
1291 static void handle_quota_files(struct super_block *s, char **qf_names,
1292 unsigned int *qfmt)
1293 {
1294 int i;
1295
1296 for (i = 0; i < MAXQUOTAS; i++) {
1297 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1298 kfree(REISERFS_SB(s)->s_qf_names[i]);
1299 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1300 }
1301 if (*qfmt)
1302 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1303 }
1304 #endif
1305
1306 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1307 {
1308 struct reiserfs_super_block *rs;
1309 struct reiserfs_transaction_handle th;
1310 unsigned long blocks;
1311 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1312 unsigned long safe_mask = 0;
1313 unsigned int commit_max_age = (unsigned int)-1;
1314 struct reiserfs_journal *journal = SB_JOURNAL(s);
1315 char *new_opts = kstrdup(arg, GFP_KERNEL);
1316 int err;
1317 char *qf_names[MAXQUOTAS];
1318 unsigned int qfmt = 0;
1319 #ifdef CONFIG_QUOTA
1320 int i;
1321 #endif
1322
1323 reiserfs_write_lock(s);
1324
1325 #ifdef CONFIG_QUOTA
1326 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327 #endif
1328
1329 rs = SB_DISK_SUPER_BLOCK(s);
1330
1331 if (!reiserfs_parse_options
1332 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333 qf_names, &qfmt)) {
1334 #ifdef CONFIG_QUOTA
1335 for (i = 0; i < MAXQUOTAS; i++)
1336 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1337 kfree(qf_names[i]);
1338 #endif
1339 err = -EINVAL;
1340 goto out_unlock;
1341 }
1342 #ifdef CONFIG_QUOTA
1343 handle_quota_files(s, qf_names, &qfmt);
1344 #endif
1345
1346 handle_attrs(s);
1347
1348 /* Add options that are safe here */
1349 safe_mask |= 1 << REISERFS_SMALLTAIL;
1350 safe_mask |= 1 << REISERFS_LARGETAIL;
1351 safe_mask |= 1 << REISERFS_NO_BORDER;
1352 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1353 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1354 safe_mask |= 1 << REISERFS_TEST4;
1355 safe_mask |= 1 << REISERFS_ATTRS;
1356 safe_mask |= 1 << REISERFS_XATTRS_USER;
1357 safe_mask |= 1 << REISERFS_POSIXACL;
1358 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1359 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1360 safe_mask |= 1 << REISERFS_ERROR_RO;
1361 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1362 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1363 safe_mask |= 1 << REISERFS_USRQUOTA;
1364 safe_mask |= 1 << REISERFS_GRPQUOTA;
1365
1366 /* Update the bitmask, taking care to keep
1367 * the bits we're not allowed to change here */
1368 REISERFS_SB(s)->s_mount_opt =
1369 (REISERFS_SB(s)->
1370 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1371
1372 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1373 journal->j_max_commit_age = commit_max_age;
1374 journal->j_max_trans_age = commit_max_age;
1375 } else if (commit_max_age == 0) {
1376 /* 0 means restore defaults. */
1377 journal->j_max_commit_age = journal->j_default_max_commit_age;
1378 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1379 }
1380
1381 if (blocks) {
1382 err = reiserfs_resize(s, blocks);
1383 if (err != 0)
1384 goto out_unlock;
1385 }
1386
1387 if (*mount_flags & MS_RDONLY) {
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;
1393
1394 /*
1395 * Drop write lock. Quota will retake it when needed and lock
1396 * ordering requires calling dquot_suspend() without it.
1397 */
1398 reiserfs_write_unlock(s);
1399 err = dquot_suspend(s, -1);
1400 if (err < 0)
1401 goto out_err;
1402 reiserfs_write_lock(s);
1403
1404 /* try to remount file system with read-only permissions */
1405 if (sb_umount_state(rs) == REISERFS_VALID_FS
1406 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1407 goto out_ok;
1408 }
1409
1410 err = journal_begin(&th, s, 10);
1411 if (err)
1412 goto out_unlock;
1413
1414 /* Mounting a rw partition read-only. */
1415 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1416 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1417 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1418 } else {
1419 /* remount read-write */
1420 if (!(s->s_flags & MS_RDONLY)) {
1421 reiserfs_xattr_init(s, *mount_flags);
1422 goto out_ok; /* We are read-write already */
1423 }
1424
1425 if (reiserfs_is_journal_aborted(journal)) {
1426 err = journal->j_errno;
1427 goto out_unlock;
1428 }
1429
1430 handle_data_mode(s, mount_options);
1431 handle_barrier_mode(s, mount_options);
1432 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1433 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1434 err = journal_begin(&th, s, 10);
1435 if (err)
1436 goto out_unlock;
1437
1438 /* Mount a partition which is read-only, read-write */
1439 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1440 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1441 s->s_flags &= ~MS_RDONLY;
1442 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1443 if (!old_format_only(s))
1444 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1445 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1446 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1447 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1448 }
1449 /* this will force a full flush of all journal lists */
1450 SB_JOURNAL(s)->j_must_wait = 1;
1451 err = journal_end(&th, s, 10);
1452 if (err)
1453 goto out_unlock;
1454
1455 if (!(*mount_flags & MS_RDONLY)) {
1456 /*
1457 * Drop write lock. Quota will retake it when needed and lock
1458 * ordering requires calling dquot_resume() without it.
1459 */
1460 reiserfs_write_unlock(s);
1461 dquot_resume(s, -1);
1462 reiserfs_write_lock(s);
1463 finish_unfinished(s);
1464 reiserfs_xattr_init(s, *mount_flags);
1465 }
1466
1467 out_ok:
1468 replace_mount_options(s, new_opts);
1469 reiserfs_write_unlock(s);
1470 return 0;
1471
1472 out_unlock:
1473 reiserfs_write_unlock(s);
1474 out_err:
1475 kfree(new_opts);
1476 return err;
1477 }
1478
1479 static int read_super_block(struct super_block *s, int offset)
1480 {
1481 struct buffer_head *bh;
1482 struct reiserfs_super_block *rs;
1483 int fs_blocksize;
1484
1485 bh = sb_bread(s, offset / s->s_blocksize);
1486 if (!bh) {
1487 reiserfs_warning(s, "sh-2006",
1488 "bread failed (dev %s, block %lu, size %lu)",
1489 reiserfs_bdevname(s), offset / s->s_blocksize,
1490 s->s_blocksize);
1491 return 1;
1492 }
1493
1494 rs = (struct reiserfs_super_block *)bh->b_data;
1495 if (!is_any_reiserfs_magic_string(rs)) {
1496 brelse(bh);
1497 return 1;
1498 }
1499 //
1500 // ok, reiserfs signature (old or new) found in at the given offset
1501 //
1502 fs_blocksize = sb_blocksize(rs);
1503 brelse(bh);
1504 sb_set_blocksize(s, fs_blocksize);
1505
1506 bh = sb_bread(s, offset / s->s_blocksize);
1507 if (!bh) {
1508 reiserfs_warning(s, "sh-2007",
1509 "bread failed (dev %s, block %lu, size %lu)",
1510 reiserfs_bdevname(s), offset / s->s_blocksize,
1511 s->s_blocksize);
1512 return 1;
1513 }
1514
1515 rs = (struct reiserfs_super_block *)bh->b_data;
1516 if (sb_blocksize(rs) != s->s_blocksize) {
1517 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1518 "filesystem on (dev %s, block %Lu, size %lu)",
1519 reiserfs_bdevname(s),
1520 (unsigned long long)bh->b_blocknr,
1521 s->s_blocksize);
1522 brelse(bh);
1523 return 1;
1524 }
1525
1526 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1527 brelse(bh);
1528 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1529 "--rebuild-tree run detected. Please run\n"
1530 "reiserfsck --rebuild-tree and wait for a "
1531 "completion. If that fails\n"
1532 "get newer reiserfsprogs package");
1533 return 1;
1534 }
1535
1536 SB_BUFFER_WITH_SB(s) = bh;
1537 SB_DISK_SUPER_BLOCK(s) = rs;
1538
1539 if (is_reiserfs_jr(rs)) {
1540 /* magic is of non-standard journal filesystem, look at s_version to
1541 find which format is in use */
1542 if (sb_version(rs) == REISERFS_VERSION_2)
1543 reiserfs_info(s, "found reiserfs format \"3.6\""
1544 " with non-standard journal\n");
1545 else if (sb_version(rs) == REISERFS_VERSION_1)
1546 reiserfs_info(s, "found reiserfs format \"3.5\""
1547 " with non-standard journal\n");
1548 else {
1549 reiserfs_warning(s, "sh-2012", "found unknown "
1550 "format \"%u\" of reiserfs with "
1551 "non-standard magic", sb_version(rs));
1552 return 1;
1553 }
1554 } else
1555 /* s_version of standard format may contain incorrect information,
1556 so we just look at the magic string */
1557 reiserfs_info(s,
1558 "found reiserfs format \"%s\" with standard journal\n",
1559 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1560
1561 s->s_op = &reiserfs_sops;
1562 s->s_export_op = &reiserfs_export_ops;
1563 #ifdef CONFIG_QUOTA
1564 s->s_qcop = &reiserfs_qctl_operations;
1565 s->dq_op = &reiserfs_quota_operations;
1566 #endif
1567
1568 /* new format is limited by the 32 bit wide i_blocks field, want to
1569 ** be one full block below that.
1570 */
1571 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1572 return 0;
1573 }
1574
1575 /* after journal replay, reread all bitmap and super blocks */
1576 static int reread_meta_blocks(struct super_block *s)
1577 {
1578 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1579 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1580 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1581 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1582 return 1;
1583 }
1584
1585 return 0;
1586 }
1587
1588 /////////////////////////////////////////////////////
1589 // hash detection stuff
1590
1591 // if root directory is empty - we set default - Yura's - hash and
1592 // warn about it
1593 // FIXME: we look for only one name in a directory. If tea and yura
1594 // bith have the same value - we ask user to send report to the
1595 // mailing list
1596 static __u32 find_hash_out(struct super_block *s)
1597 {
1598 int retval;
1599 struct inode *inode;
1600 struct cpu_key key;
1601 INITIALIZE_PATH(path);
1602 struct reiserfs_dir_entry de;
1603 __u32 hash = DEFAULT_HASH;
1604
1605 inode = s->s_root->d_inode;
1606
1607 do { // Some serious "goto"-hater was there ;)
1608 u32 teahash, r5hash, yurahash;
1609
1610 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1611 retval = search_by_entry_key(s, &key, &path, &de);
1612 if (retval == IO_ERROR) {
1613 pathrelse(&path);
1614 return UNSET_HASH;
1615 }
1616 if (retval == NAME_NOT_FOUND)
1617 de.de_entry_num--;
1618 set_de_name_and_namelen(&de);
1619 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1620 /* allow override in this case */
1621 if (reiserfs_rupasov_hash(s)) {
1622 hash = YURA_HASH;
1623 }
1624 reiserfs_info(s, "FS seems to be empty, autodetect "
1625 "is using the default hash\n");
1626 break;
1627 }
1628 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1629 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1630 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1631 if (((teahash == r5hash)
1632 &&
1633 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1634 == r5hash)) || ((teahash == yurahash)
1635 && (yurahash ==
1636 GET_HASH_VALUE(deh_offset
1637 (&
1638 (de.
1639 de_deh[de.
1640 de_entry_num])))))
1641 || ((r5hash == yurahash)
1642 && (yurahash ==
1643 GET_HASH_VALUE(deh_offset
1644 (&(de.de_deh[de.de_entry_num])))))) {
1645 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1646 "automatically detect hash function. "
1647 "Please mount with -o "
1648 "hash={tea,rupasov,r5}");
1649 hash = UNSET_HASH;
1650 break;
1651 }
1652 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1653 yurahash)
1654 hash = YURA_HASH;
1655 else if (GET_HASH_VALUE
1656 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1657 hash = TEA_HASH;
1658 else if (GET_HASH_VALUE
1659 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1660 hash = R5_HASH;
1661 else {
1662 reiserfs_warning(s, "reiserfs-2506",
1663 "Unrecognised hash function");
1664 hash = UNSET_HASH;
1665 }
1666 } while (0);
1667
1668 pathrelse(&path);
1669 return hash;
1670 }
1671
1672 // finds out which hash names are sorted with
1673 static int what_hash(struct super_block *s)
1674 {
1675 __u32 code;
1676
1677 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1678
1679 /* reiserfs_hash_detect() == true if any of the hash mount options
1680 ** were used. We must check them to make sure the user isn't
1681 ** using a bad hash value
1682 */
1683 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1684 code = find_hash_out(s);
1685
1686 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1687 /* detection has found the hash, and we must check against the
1688 ** mount options
1689 */
1690 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1691 reiserfs_warning(s, "reiserfs-2507",
1692 "Error, %s hash detected, "
1693 "unable to force rupasov hash",
1694 reiserfs_hashname(code));
1695 code = UNSET_HASH;
1696 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1697 reiserfs_warning(s, "reiserfs-2508",
1698 "Error, %s hash detected, "
1699 "unable to force tea hash",
1700 reiserfs_hashname(code));
1701 code = UNSET_HASH;
1702 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1703 reiserfs_warning(s, "reiserfs-2509",
1704 "Error, %s hash detected, "
1705 "unable to force r5 hash",
1706 reiserfs_hashname(code));
1707 code = UNSET_HASH;
1708 }
1709 } else {
1710 /* find_hash_out was not called or could not determine the hash */
1711 if (reiserfs_rupasov_hash(s)) {
1712 code = YURA_HASH;
1713 } else if (reiserfs_tea_hash(s)) {
1714 code = TEA_HASH;
1715 } else if (reiserfs_r5_hash(s)) {
1716 code = R5_HASH;
1717 }
1718 }
1719
1720 /* if we are mounted RW, and we have a new valid hash code, update
1721 ** the super
1722 */
1723 if (code != UNSET_HASH &&
1724 !(s->s_flags & MS_RDONLY) &&
1725 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1726 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1727 }
1728 return code;
1729 }
1730
1731 // return pointer to appropriate function
1732 static hashf_t hash_function(struct super_block *s)
1733 {
1734 switch (what_hash(s)) {
1735 case TEA_HASH:
1736 reiserfs_info(s, "Using tea hash to sort names\n");
1737 return keyed_hash;
1738 case YURA_HASH:
1739 reiserfs_info(s, "Using rupasov hash to sort names\n");
1740 return yura_hash;
1741 case R5_HASH:
1742 reiserfs_info(s, "Using r5 hash to sort names\n");
1743 return r5_hash;
1744 }
1745 return NULL;
1746 }
1747
1748 // this is used to set up correct value for old partitions
1749 static int function2code(hashf_t func)
1750 {
1751 if (func == keyed_hash)
1752 return TEA_HASH;
1753 if (func == yura_hash)
1754 return YURA_HASH;
1755 if (func == r5_hash)
1756 return R5_HASH;
1757
1758 BUG(); // should never happen
1759
1760 return 0;
1761 }
1762
1763 #define SWARN(silent, s, id, ...) \
1764 if (!(silent)) \
1765 reiserfs_warning(s, id, __VA_ARGS__)
1766
1767 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1768 {
1769 struct inode *root_inode;
1770 struct reiserfs_transaction_handle th;
1771 int old_format = 0;
1772 unsigned long blocks;
1773 unsigned int commit_max_age = 0;
1774 int jinit_done = 0;
1775 struct reiserfs_iget_args args;
1776 struct reiserfs_super_block *rs;
1777 char *jdev_name;
1778 struct reiserfs_sb_info *sbi;
1779 int errval = -EINVAL;
1780 char *qf_names[MAXQUOTAS] = {};
1781 unsigned int qfmt = 0;
1782
1783 save_mount_options(s, data);
1784
1785 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1786 if (!sbi)
1787 return -ENOMEM;
1788 s->s_fs_info = sbi;
1789 /* Set default values for options: non-aggressive tails, RO on errors */
1790 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1791 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1792 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1793 /* no preallocation minimum, be smart in
1794 reiserfs_file_write instead */
1795 sbi->s_alloc_options.preallocmin = 0;
1796 /* Preallocate by 16 blocks (17-1) at once */
1797 sbi->s_alloc_options.preallocsize = 17;
1798 /* setup default block allocator options */
1799 reiserfs_init_alloc_options(s);
1800
1801 spin_lock_init(&sbi->old_work_lock);
1802 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1803 mutex_init(&sbi->lock);
1804 sbi->lock_depth = -1;
1805
1806 jdev_name = NULL;
1807 if (reiserfs_parse_options
1808 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1809 &commit_max_age, qf_names, &qfmt) == 0) {
1810 goto error_unlocked;
1811 }
1812 if (jdev_name && jdev_name[0]) {
1813 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1814 if (!sbi->s_jdev) {
1815 SWARN(silent, s, "", "Cannot allocate memory for "
1816 "journal device name");
1817 goto error;
1818 }
1819 }
1820 #ifdef CONFIG_QUOTA
1821 handle_quota_files(s, qf_names, &qfmt);
1822 #endif
1823
1824 if (blocks) {
1825 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1826 goto error_unlocked;
1827 }
1828
1829 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1830 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1831 old_format = 1;
1832 /* try new format (64-th 1k block), which can contain reiserfs super block */
1833 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1834 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1835 reiserfs_bdevname(s));
1836 goto error_unlocked;
1837 }
1838
1839 rs = SB_DISK_SUPER_BLOCK(s);
1840 /* Let's do basic sanity check to verify that underlying device is not
1841 smaller than the filesystem. If the check fails then abort and scream,
1842 because bad stuff will happen otherwise. */
1843 if (s->s_bdev && s->s_bdev->bd_inode
1844 && i_size_read(s->s_bdev->bd_inode) <
1845 sb_block_count(rs) * sb_blocksize(rs)) {
1846 SWARN(silent, s, "", "Filesystem cannot be "
1847 "mounted because it is bigger than the device");
1848 SWARN(silent, s, "", "You may need to run fsck "
1849 "or increase size of your LVM partition");
1850 SWARN(silent, s, "", "Or may be you forgot to "
1851 "reboot after fdisk when it told you to");
1852 goto error_unlocked;
1853 }
1854
1855 sbi->s_mount_state = SB_REISERFS_STATE(s);
1856 sbi->s_mount_state = REISERFS_VALID_FS;
1857
1858 if ((errval = reiserfs_init_bitmap_cache(s))) {
1859 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1860 goto error_unlocked;
1861 }
1862
1863 errval = -EINVAL;
1864 #ifdef CONFIG_REISERFS_CHECK
1865 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1866 SWARN(silent, s, "", "- it is slow mode for debugging.");
1867 #endif
1868
1869 /* make data=ordered the default */
1870 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1871 !reiserfs_data_writeback(s)) {
1872 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1873 }
1874
1875 if (reiserfs_data_log(s)) {
1876 reiserfs_info(s, "using journaled data mode\n");
1877 } else if (reiserfs_data_ordered(s)) {
1878 reiserfs_info(s, "using ordered data mode\n");
1879 } else {
1880 reiserfs_info(s, "using writeback data mode\n");
1881 }
1882 if (reiserfs_barrier_flush(s)) {
1883 printk("reiserfs: using flush barriers\n");
1884 }
1885
1886 // set_device_ro(s->s_dev, 1) ;
1887 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1888 SWARN(silent, s, "sh-2022",
1889 "unable to initialize journal space");
1890 goto error_unlocked;
1891 } else {
1892 jinit_done = 1; /* once this is set, journal_release must be called
1893 ** if we error out of the mount
1894 */
1895 }
1896
1897 if (reread_meta_blocks(s)) {
1898 SWARN(silent, s, "jmacd-9",
1899 "unable to reread meta blocks after journal init");
1900 goto error_unlocked;
1901 }
1902
1903 if (replay_only(s))
1904 goto error_unlocked;
1905
1906 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1907 SWARN(silent, s, "clm-7000",
1908 "Detected readonly device, marking FS readonly");
1909 s->s_flags |= MS_RDONLY;
1910 }
1911 args.objectid = REISERFS_ROOT_OBJECTID;
1912 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1913 root_inode =
1914 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1915 reiserfs_init_locked_inode, (void *)(&args));
1916 if (!root_inode) {
1917 SWARN(silent, s, "jmacd-10", "get root inode failed");
1918 goto error_unlocked;
1919 }
1920
1921 /*
1922 * This path assumed to be called with the BKL in the old times.
1923 * Now we have inherited the big reiserfs lock from it and many
1924 * reiserfs helpers called in the mount path and elsewhere require
1925 * this lock to be held even if it's not always necessary. Let's be
1926 * conservative and hold it early. The window can be reduced after
1927 * careful review of the code.
1928 */
1929 reiserfs_write_lock(s);
1930
1931 if (root_inode->i_state & I_NEW) {
1932 reiserfs_read_locked_inode(root_inode, &args);
1933 unlock_new_inode(root_inode);
1934 }
1935
1936 s->s_root = d_make_root(root_inode);
1937 if (!s->s_root)
1938 goto error;
1939 // define and initialize hash function
1940 sbi->s_hash_function = hash_function(s);
1941 if (sbi->s_hash_function == NULL) {
1942 dput(s->s_root);
1943 s->s_root = NULL;
1944 goto error;
1945 }
1946
1947 if (is_reiserfs_3_5(rs)
1948 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1949 set_bit(REISERFS_3_5, &(sbi->s_properties));
1950 else if (old_format)
1951 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1952 else
1953 set_bit(REISERFS_3_6, &(sbi->s_properties));
1954
1955 if (!(s->s_flags & MS_RDONLY)) {
1956
1957 errval = journal_begin(&th, s, 1);
1958 if (errval) {
1959 dput(s->s_root);
1960 s->s_root = NULL;
1961 goto error;
1962 }
1963 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1964
1965 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1966 set_sb_fs_state(rs, 0);
1967
1968 /* Clear out s_bmap_nr if it would wrap. We can handle this
1969 * case, but older revisions can't. This will cause the
1970 * file system to fail mount on those older implementations,
1971 * avoiding corruption. -jeffm */
1972 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1973 sb_bmap_nr(rs) != 0) {
1974 reiserfs_warning(s, "super-2030", "This file system "
1975 "claims to use %u bitmap blocks in "
1976 "its super block, but requires %u. "
1977 "Clearing to zero.", sb_bmap_nr(rs),
1978 reiserfs_bmap_count(s));
1979
1980 set_sb_bmap_nr(rs, 0);
1981 }
1982
1983 if (old_format_only(s)) {
1984 /* filesystem of format 3.5 either with standard or non-standard
1985 journal */
1986 if (convert_reiserfs(s)) {
1987 /* and -o conv is given */
1988 if (!silent)
1989 reiserfs_info(s,
1990 "converting 3.5 filesystem to the 3.6 format");
1991
1992 if (is_reiserfs_3_5(rs))
1993 /* put magic string of 3.6 format. 2.2 will not be able to
1994 mount this filesystem anymore */
1995 memcpy(rs->s_v1.s_magic,
1996 reiserfs_3_6_magic_string,
1997 sizeof
1998 (reiserfs_3_6_magic_string));
1999
2000 set_sb_version(rs, REISERFS_VERSION_2);
2001 reiserfs_convert_objectid_map_v1(s);
2002 set_bit(REISERFS_3_6, &(sbi->s_properties));
2003 clear_bit(REISERFS_3_5, &(sbi->s_properties));
2004 } else if (!silent) {
2005 reiserfs_info(s, "using 3.5.x disk format\n");
2006 }
2007 } else
2008 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2009
2010
2011 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2012 errval = journal_end(&th, s, 1);
2013 if (errval) {
2014 dput(s->s_root);
2015 s->s_root = NULL;
2016 goto error;
2017 }
2018
2019 if ((errval = reiserfs_lookup_privroot(s)) ||
2020 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2021 dput(s->s_root);
2022 s->s_root = NULL;
2023 goto error;
2024 }
2025
2026 /* look for files which were to be removed in previous session */
2027 finish_unfinished(s);
2028 } else {
2029 if (old_format_only(s) && !silent) {
2030 reiserfs_info(s, "using 3.5.x disk format\n");
2031 }
2032
2033 if ((errval = reiserfs_lookup_privroot(s)) ||
2034 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2035 dput(s->s_root);
2036 s->s_root = NULL;
2037 goto error;
2038 }
2039 }
2040 // mark hash in super block: it could be unset. overwrite should be ok
2041 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2042
2043 handle_attrs(s);
2044
2045 reiserfs_proc_info_init(s);
2046
2047 init_waitqueue_head(&(sbi->s_wait));
2048 spin_lock_init(&sbi->bitmap_lock);
2049
2050 reiserfs_write_unlock(s);
2051
2052 return (0);
2053
2054 error:
2055 reiserfs_write_unlock(s);
2056
2057 error_unlocked:
2058 /* kill the commit thread, free journal ram */
2059 if (jinit_done) {
2060 reiserfs_write_lock(s);
2061 journal_release_error(NULL, s);
2062 reiserfs_write_unlock(s);
2063 }
2064
2065 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2066
2067 reiserfs_free_bitmap_cache(s);
2068 if (SB_BUFFER_WITH_SB(s))
2069 brelse(SB_BUFFER_WITH_SB(s));
2070 #ifdef CONFIG_QUOTA
2071 {
2072 int j;
2073 for (j = 0; j < MAXQUOTAS; j++)
2074 kfree(qf_names[j]);
2075 }
2076 #endif
2077 kfree(sbi);
2078
2079 s->s_fs_info = NULL;
2080 return errval;
2081 }
2082
2083 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2084 {
2085 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2086
2087 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2088 buf->f_bfree = sb_free_blocks(rs);
2089 buf->f_bavail = buf->f_bfree;
2090 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2091 buf->f_bsize = dentry->d_sb->s_blocksize;
2092 /* changed to accommodate gcc folks. */
2093 buf->f_type = REISERFS_SUPER_MAGIC;
2094 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2095 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2096 sizeof(rs->s_uuid)/2);
2097
2098 return 0;
2099 }
2100
2101 #ifdef CONFIG_QUOTA
2102 static int reiserfs_write_dquot(struct dquot *dquot)
2103 {
2104 struct reiserfs_transaction_handle th;
2105 int ret, err;
2106
2107 reiserfs_write_lock(dquot->dq_sb);
2108 ret =
2109 journal_begin(&th, dquot->dq_sb,
2110 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2111 if (ret)
2112 goto out;
2113 reiserfs_write_unlock(dquot->dq_sb);
2114 ret = dquot_commit(dquot);
2115 reiserfs_write_lock(dquot->dq_sb);
2116 err =
2117 journal_end(&th, dquot->dq_sb,
2118 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2119 if (!ret && err)
2120 ret = err;
2121 out:
2122 reiserfs_write_unlock(dquot->dq_sb);
2123 return ret;
2124 }
2125
2126 static int reiserfs_acquire_dquot(struct dquot *dquot)
2127 {
2128 struct reiserfs_transaction_handle th;
2129 int ret, err;
2130
2131 reiserfs_write_lock(dquot->dq_sb);
2132 ret =
2133 journal_begin(&th, dquot->dq_sb,
2134 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2135 if (ret)
2136 goto out;
2137 reiserfs_write_unlock(dquot->dq_sb);
2138 ret = dquot_acquire(dquot);
2139 reiserfs_write_lock(dquot->dq_sb);
2140 err =
2141 journal_end(&th, dquot->dq_sb,
2142 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2143 if (!ret && err)
2144 ret = err;
2145 out:
2146 reiserfs_write_unlock(dquot->dq_sb);
2147 return ret;
2148 }
2149
2150 static int reiserfs_release_dquot(struct dquot *dquot)
2151 {
2152 struct reiserfs_transaction_handle th;
2153 int ret, err;
2154
2155 reiserfs_write_lock(dquot->dq_sb);
2156 ret =
2157 journal_begin(&th, dquot->dq_sb,
2158 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2159 reiserfs_write_unlock(dquot->dq_sb);
2160 if (ret) {
2161 /* Release dquot anyway to avoid endless cycle in dqput() */
2162 dquot_release(dquot);
2163 goto out;
2164 }
2165 ret = dquot_release(dquot);
2166 reiserfs_write_lock(dquot->dq_sb);
2167 err =
2168 journal_end(&th, dquot->dq_sb,
2169 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2170 if (!ret && err)
2171 ret = err;
2172 reiserfs_write_unlock(dquot->dq_sb);
2173 out:
2174 return ret;
2175 }
2176
2177 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2178 {
2179 /* Are we journaling quotas? */
2180 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2181 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2182 dquot_mark_dquot_dirty(dquot);
2183 return reiserfs_write_dquot(dquot);
2184 } else
2185 return dquot_mark_dquot_dirty(dquot);
2186 }
2187
2188 static int reiserfs_write_info(struct super_block *sb, int type)
2189 {
2190 struct reiserfs_transaction_handle th;
2191 int ret, err;
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 reiserfs_write_unlock(sb);
2199 ret = dquot_commit_info(sb, type);
2200 reiserfs_write_lock(sb);
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
2438 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2439 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2440 MODULE_LICENSE("GPL");
2441
2442 module_init(init_reiserfs_fs);
2443 module_exit(exit_reiserfs_fs);
CRIS linux kernel tree