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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[deliverable/linux.git] / fs / reiserfs / super.c
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <linux/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/seq_file.h>
32
33 struct file_system_type reiserfs_fs_type;
34
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42 strlen(reiserfs_3_5_magic_string));
43 }
44
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48 strlen(reiserfs_3_6_magic_string));
49 }
50
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54 strlen(reiserfs_jr_magic_string));
55 }
56
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60 is_reiserfs_jr(rs));
61 }
62
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68 struct reiserfs_transaction_handle th;
69
70 /*
71 * Writeback quota in non-journalled quota case - journalled quota has
72 * no dirty dquots
73 */
74 dquot_writeback_dquots(s, -1);
75 reiserfs_write_lock(s);
76 if (!journal_begin(&th, s, 1))
77 if (!journal_end_sync(&th))
78 reiserfs_flush_old_commits(s);
79 reiserfs_write_unlock(s);
80 return 0;
81 }
82
83 static void flush_old_commits(struct work_struct *work)
84 {
85 struct reiserfs_sb_info *sbi;
86 struct super_block *s;
87
88 sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
89 s = sbi->s_journal->j_work_sb;
90
91 spin_lock(&sbi->old_work_lock);
92 sbi->work_queued = 0;
93 spin_unlock(&sbi->old_work_lock);
94
95 reiserfs_sync_fs(s, 1);
96 }
97
98 void reiserfs_schedule_old_flush(struct super_block *s)
99 {
100 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
101 unsigned long delay;
102
103 /*
104 * Avoid scheduling flush when sb is being shut down. It can race
105 * with journal shutdown and free still queued delayed work.
106 */
107 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
108 return;
109
110 spin_lock(&sbi->old_work_lock);
111 if (!sbi->work_queued) {
112 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
113 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
114 sbi->work_queued = 1;
115 }
116 spin_unlock(&sbi->old_work_lock);
117 }
118
119 static void cancel_old_flush(struct super_block *s)
120 {
121 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
122
123 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
124 spin_lock(&sbi->old_work_lock);
125 sbi->work_queued = 0;
126 spin_unlock(&sbi->old_work_lock);
127 }
128
129 static int reiserfs_freeze(struct super_block *s)
130 {
131 struct reiserfs_transaction_handle th;
132
133 cancel_old_flush(s);
134
135 reiserfs_write_lock(s);
136 if (!(s->s_flags & MS_RDONLY)) {
137 int err = journal_begin(&th, s, 1);
138 if (err) {
139 reiserfs_block_writes(&th);
140 } else {
141 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
142 1);
143 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
144 reiserfs_block_writes(&th);
145 journal_end_sync(&th);
146 }
147 }
148 reiserfs_write_unlock(s);
149 return 0;
150 }
151
152 static int reiserfs_unfreeze(struct super_block *s)
153 {
154 reiserfs_allow_writes(s);
155 return 0;
156 }
157
158 extern const struct in_core_key MAX_IN_CORE_KEY;
159
160 /*
161 * this is used to delete "save link" when there are no items of a
162 * file it points to. It can either happen if unlink is completed but
163 * "save unlink" removal, or if file has both unlink and truncate
164 * pending and as unlink completes first (because key of "save link"
165 * protecting unlink is bigger that a key lf "save link" which
166 * protects truncate), so there left no items to make truncate
167 * completion on
168 */
169 static int remove_save_link_only(struct super_block *s,
170 struct reiserfs_key *key, int oid_free)
171 {
172 struct reiserfs_transaction_handle th;
173 int err;
174
175 /* we are going to do one balancing */
176 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
177 if (err)
178 return err;
179
180 reiserfs_delete_solid_item(&th, NULL, key);
181 if (oid_free)
182 /* removals are protected by direct items */
183 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
184
185 return journal_end(&th);
186 }
187
188 #ifdef CONFIG_QUOTA
189 static int reiserfs_quota_on_mount(struct super_block *, int);
190 #endif
191
192 /* look for uncompleted unlinks and truncates and complete them */
193 static int finish_unfinished(struct super_block *s)
194 {
195 INITIALIZE_PATH(path);
196 struct cpu_key max_cpu_key, obj_key;
197 struct reiserfs_key save_link_key, last_inode_key;
198 int retval = 0;
199 struct item_head *ih;
200 struct buffer_head *bh;
201 int item_pos;
202 char *item;
203 int done;
204 struct inode *inode;
205 int truncate;
206 #ifdef CONFIG_QUOTA
207 int i;
208 int ms_active_set;
209 int quota_enabled[REISERFS_MAXQUOTAS];
210 #endif
211
212 /* compose key to look for "save" links */
213 max_cpu_key.version = KEY_FORMAT_3_5;
214 max_cpu_key.on_disk_key.k_dir_id = ~0U;
215 max_cpu_key.on_disk_key.k_objectid = ~0U;
216 set_cpu_key_k_offset(&max_cpu_key, ~0U);
217 max_cpu_key.key_length = 3;
218
219 memset(&last_inode_key, 0, sizeof(last_inode_key));
220
221 #ifdef CONFIG_QUOTA
222 /* Needed for iput() to work correctly and not trash data */
223 if (s->s_flags & MS_ACTIVE) {
224 ms_active_set = 0;
225 } else {
226 ms_active_set = 1;
227 s->s_flags |= MS_ACTIVE;
228 }
229 /* Turn on quotas so that they are updated correctly */
230 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
231 quota_enabled[i] = 1;
232 if (REISERFS_SB(s)->s_qf_names[i]) {
233 int ret;
234
235 if (sb_has_quota_active(s, i)) {
236 quota_enabled[i] = 0;
237 continue;
238 }
239 ret = reiserfs_quota_on_mount(s, i);
240 if (ret < 0)
241 reiserfs_warning(s, "reiserfs-2500",
242 "cannot turn on journaled "
243 "quota: error %d", ret);
244 }
245 }
246 #endif
247
248 done = 0;
249 REISERFS_SB(s)->s_is_unlinked_ok = 1;
250 while (!retval) {
251 int depth;
252 retval = search_item(s, &max_cpu_key, &path);
253 if (retval != ITEM_NOT_FOUND) {
254 reiserfs_error(s, "vs-2140",
255 "search_by_key returned %d", retval);
256 break;
257 }
258
259 bh = get_last_bh(&path);
260 item_pos = get_item_pos(&path);
261 if (item_pos != B_NR_ITEMS(bh)) {
262 reiserfs_warning(s, "vs-2060",
263 "wrong position found");
264 break;
265 }
266 item_pos--;
267 ih = item_head(bh, item_pos);
268
269 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
270 /* there are no "save" links anymore */
271 break;
272
273 save_link_key = ih->ih_key;
274 if (is_indirect_le_ih(ih))
275 truncate = 1;
276 else
277 truncate = 0;
278
279 /* reiserfs_iget needs k_dirid and k_objectid only */
280 item = ih_item_body(bh, ih);
281 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
282 obj_key.on_disk_key.k_objectid =
283 le32_to_cpu(ih->ih_key.k_objectid);
284 obj_key.on_disk_key.k_offset = 0;
285 obj_key.on_disk_key.k_type = 0;
286
287 pathrelse(&path);
288
289 inode = reiserfs_iget(s, &obj_key);
290 if (!inode) {
291 /*
292 * the unlink almost completed, it just did not
293 * manage to remove "save" link and release objectid
294 */
295 reiserfs_warning(s, "vs-2180", "iget failed for %K",
296 &obj_key);
297 retval = remove_save_link_only(s, &save_link_key, 1);
298 continue;
299 }
300
301 if (!truncate && inode->i_nlink) {
302 /* file is not unlinked */
303 reiserfs_warning(s, "vs-2185",
304 "file %K is not unlinked",
305 &obj_key);
306 retval = remove_save_link_only(s, &save_link_key, 0);
307 continue;
308 }
309 depth = reiserfs_write_unlock_nested(inode->i_sb);
310 dquot_initialize(inode);
311 reiserfs_write_lock_nested(inode->i_sb, depth);
312
313 if (truncate && S_ISDIR(inode->i_mode)) {
314 /*
315 * We got a truncate request for a dir which
316 * is impossible. The only imaginable way is to
317 * execute unfinished truncate request then boot
318 * into old kernel, remove the file and create dir
319 * with the same key.
320 */
321 reiserfs_warning(s, "green-2101",
322 "impossible truncate on a "
323 "directory %k. Please report",
324 INODE_PKEY(inode));
325 retval = remove_save_link_only(s, &save_link_key, 0);
326 truncate = 0;
327 iput(inode);
328 continue;
329 }
330
331 if (truncate) {
332 REISERFS_I(inode)->i_flags |=
333 i_link_saved_truncate_mask;
334 /*
335 * not completed truncate found. New size was
336 * committed together with "save" link
337 */
338 reiserfs_info(s, "Truncating %k to %lld ..",
339 INODE_PKEY(inode), inode->i_size);
340
341 /* don't update modification time */
342 reiserfs_truncate_file(inode, 0);
343
344 retval = remove_save_link(inode, truncate);
345 } else {
346 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
347 /* not completed unlink (rmdir) found */
348 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
349 if (memcmp(&last_inode_key, INODE_PKEY(inode),
350 sizeof(last_inode_key))){
351 last_inode_key = *INODE_PKEY(inode);
352 /* removal gets completed in iput */
353 retval = 0;
354 } else {
355 reiserfs_warning(s, "super-2189", "Dead loop "
356 "in finish_unfinished "
357 "detected, just remove "
358 "save link\n");
359 retval = remove_save_link_only(s,
360 &save_link_key, 0);
361 }
362 }
363
364 iput(inode);
365 printk("done\n");
366 done++;
367 }
368 REISERFS_SB(s)->s_is_unlinked_ok = 0;
369
370 #ifdef CONFIG_QUOTA
371 /* Turn quotas off */
372 reiserfs_write_unlock(s);
373 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
374 if (sb_dqopt(s)->files[i] && quota_enabled[i])
375 dquot_quota_off(s, i);
376 }
377 reiserfs_write_lock(s);
378 if (ms_active_set)
379 /* Restore the flag back */
380 s->s_flags &= ~MS_ACTIVE;
381 #endif
382 pathrelse(&path);
383 if (done)
384 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
385 "Completed\n", done);
386 return retval;
387 }
388
389 /*
390 * to protect file being unlinked from getting lost we "safe" link files
391 * being unlinked. This link will be deleted in the same transaction with last
392 * item of file. mounting the filesystem we scan all these links and remove
393 * files which almost got lost
394 */
395 void add_save_link(struct reiserfs_transaction_handle *th,
396 struct inode *inode, int truncate)
397 {
398 INITIALIZE_PATH(path);
399 int retval;
400 struct cpu_key key;
401 struct item_head ih;
402 __le32 link;
403
404 BUG_ON(!th->t_trans_id);
405
406 /* file can only get one "save link" of each kind */
407 RFALSE(truncate &&
408 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
409 "saved link already exists for truncated inode %lx",
410 (long)inode->i_ino);
411 RFALSE(!truncate &&
412 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
413 "saved link already exists for unlinked inode %lx",
414 (long)inode->i_ino);
415
416 /* setup key of "save" link */
417 key.version = KEY_FORMAT_3_5;
418 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
419 key.on_disk_key.k_objectid = inode->i_ino;
420 if (!truncate) {
421 /* unlink, rmdir, rename */
422 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
423 set_cpu_key_k_type(&key, TYPE_DIRECT);
424
425 /* item head of "safe" link */
426 make_le_item_head(&ih, &key, key.version,
427 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
428 4 /*length */ , 0xffff /*free space */ );
429 } else {
430 /* truncate */
431 if (S_ISDIR(inode->i_mode))
432 reiserfs_warning(inode->i_sb, "green-2102",
433 "Adding a truncate savelink for "
434 "a directory %k! Please report",
435 INODE_PKEY(inode));
436 set_cpu_key_k_offset(&key, 1);
437 set_cpu_key_k_type(&key, TYPE_INDIRECT);
438
439 /* item head of "safe" link */
440 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
441 4 /*length */ , 0 /*free space */ );
442 }
443 key.key_length = 3;
444
445 /* look for its place in the tree */
446 retval = search_item(inode->i_sb, &key, &path);
447 if (retval != ITEM_NOT_FOUND) {
448 if (retval != -ENOSPC)
449 reiserfs_error(inode->i_sb, "vs-2100",
450 "search_by_key (%K) returned %d", &key,
451 retval);
452 pathrelse(&path);
453 return;
454 }
455
456 /* body of "save" link */
457 link = INODE_PKEY(inode)->k_dir_id;
458
459 /* put "save" link into tree, don't charge quota to anyone */
460 retval =
461 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
462 if (retval) {
463 if (retval != -ENOSPC)
464 reiserfs_error(inode->i_sb, "vs-2120",
465 "insert_item returned %d", retval);
466 } else {
467 if (truncate)
468 REISERFS_I(inode)->i_flags |=
469 i_link_saved_truncate_mask;
470 else
471 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
472 }
473 }
474
475 /* this opens transaction unlike add_save_link */
476 int remove_save_link(struct inode *inode, int truncate)
477 {
478 struct reiserfs_transaction_handle th;
479 struct reiserfs_key key;
480 int err;
481
482 /* we are going to do one balancing only */
483 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
484 if (err)
485 return err;
486
487 /* setup key of "save" link */
488 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
489 key.k_objectid = INODE_PKEY(inode)->k_objectid;
490 if (!truncate) {
491 /* unlink, rmdir, rename */
492 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
493 1 + inode->i_sb->s_blocksize);
494 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
495 } else {
496 /* truncate */
497 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
498 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
499 }
500
501 if ((truncate &&
502 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
503 (!truncate &&
504 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
505 /* don't take quota bytes from anywhere */
506 reiserfs_delete_solid_item(&th, NULL, &key);
507 if (!truncate) {
508 reiserfs_release_objectid(&th, inode->i_ino);
509 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
510 } else
511 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
512
513 return journal_end(&th);
514 }
515
516 static void reiserfs_kill_sb(struct super_block *s)
517 {
518 if (REISERFS_SB(s)) {
519 reiserfs_proc_info_done(s);
520 /*
521 * Force any pending inode evictions to occur now. Any
522 * inodes to be removed that have extended attributes
523 * associated with them need to clean them up before
524 * we can release the extended attribute root dentries.
525 * shrink_dcache_for_umount will BUG if we don't release
526 * those before it's called so ->put_super is too late.
527 */
528 shrink_dcache_sb(s);
529
530 dput(REISERFS_SB(s)->xattr_root);
531 REISERFS_SB(s)->xattr_root = NULL;
532 dput(REISERFS_SB(s)->priv_root);
533 REISERFS_SB(s)->priv_root = NULL;
534 }
535
536 kill_block_super(s);
537 }
538
539 static void reiserfs_put_super(struct super_block *s)
540 {
541 struct reiserfs_transaction_handle th;
542 th.t_trans_id = 0;
543
544 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
545
546 reiserfs_write_lock(s);
547
548 /*
549 * change file system state to current state if it was mounted
550 * with read-write permissions
551 */
552 if (!(s->s_flags & MS_RDONLY)) {
553 if (!journal_begin(&th, s, 10)) {
554 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
555 1);
556 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
557 REISERFS_SB(s)->s_mount_state);
558 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
559 }
560 }
561
562 /*
563 * note, journal_release checks for readonly mount, and can
564 * decide not to do a journal_end
565 */
566 journal_release(&th, s);
567
568 reiserfs_free_bitmap_cache(s);
569
570 brelse(SB_BUFFER_WITH_SB(s));
571
572 print_statistics(s);
573
574 if (REISERFS_SB(s)->reserved_blocks != 0) {
575 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
576 REISERFS_SB(s)->reserved_blocks);
577 }
578
579 reiserfs_write_unlock(s);
580 mutex_destroy(&REISERFS_SB(s)->lock);
581 destroy_workqueue(REISERFS_SB(s)->commit_wq);
582 kfree(s->s_fs_info);
583 s->s_fs_info = NULL;
584 }
585
586 static struct kmem_cache *reiserfs_inode_cachep;
587
588 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
589 {
590 struct reiserfs_inode_info *ei;
591 ei = (struct reiserfs_inode_info *)
592 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
593 if (!ei)
594 return NULL;
595 atomic_set(&ei->openers, 0);
596 mutex_init(&ei->tailpack);
597 return &ei->vfs_inode;
598 }
599
600 static void reiserfs_i_callback(struct rcu_head *head)
601 {
602 struct inode *inode = container_of(head, struct inode, i_rcu);
603 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
604 }
605
606 static void reiserfs_destroy_inode(struct inode *inode)
607 {
608 call_rcu(&inode->i_rcu, reiserfs_i_callback);
609 }
610
611 static void init_once(void *foo)
612 {
613 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
614
615 INIT_LIST_HEAD(&ei->i_prealloc_list);
616 inode_init_once(&ei->vfs_inode);
617 }
618
619 static int __init init_inodecache(void)
620 {
621 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
622 sizeof(struct
623 reiserfs_inode_info),
624 0, (SLAB_RECLAIM_ACCOUNT|
625 SLAB_MEM_SPREAD),
626 init_once);
627 if (reiserfs_inode_cachep == NULL)
628 return -ENOMEM;
629 return 0;
630 }
631
632 static void destroy_inodecache(void)
633 {
634 /*
635 * Make sure all delayed rcu free inodes are flushed before we
636 * destroy cache.
637 */
638 rcu_barrier();
639 kmem_cache_destroy(reiserfs_inode_cachep);
640 }
641
642 /* we don't mark inodes dirty, we just log them */
643 static void reiserfs_dirty_inode(struct inode *inode, int flags)
644 {
645 struct reiserfs_transaction_handle th;
646
647 int err = 0;
648
649 if (inode->i_sb->s_flags & MS_RDONLY) {
650 reiserfs_warning(inode->i_sb, "clm-6006",
651 "writing inode %lu on readonly FS",
652 inode->i_ino);
653 return;
654 }
655 reiserfs_write_lock(inode->i_sb);
656
657 /*
658 * this is really only used for atime updates, so they don't have
659 * to be included in O_SYNC or fsync
660 */
661 err = journal_begin(&th, inode->i_sb, 1);
662 if (err)
663 goto out;
664
665 reiserfs_update_sd(&th, inode);
666 journal_end(&th);
667
668 out:
669 reiserfs_write_unlock(inode->i_sb);
670 }
671
672 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
673 {
674 struct super_block *s = root->d_sb;
675 struct reiserfs_journal *journal = SB_JOURNAL(s);
676 long opts = REISERFS_SB(s)->s_mount_opt;
677
678 if (opts & (1 << REISERFS_LARGETAIL))
679 seq_puts(seq, ",tails=on");
680 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
681 seq_puts(seq, ",notail");
682 /* tails=small is default so we don't show it */
683
684 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
685 seq_puts(seq, ",barrier=none");
686 /* barrier=flush is default so we don't show it */
687
688 if (opts & (1 << REISERFS_ERROR_CONTINUE))
689 seq_puts(seq, ",errors=continue");
690 else if (opts & (1 << REISERFS_ERROR_PANIC))
691 seq_puts(seq, ",errors=panic");
692 /* errors=ro is default so we don't show it */
693
694 if (opts & (1 << REISERFS_DATA_LOG))
695 seq_puts(seq, ",data=journal");
696 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
697 seq_puts(seq, ",data=writeback");
698 /* data=ordered is default so we don't show it */
699
700 if (opts & (1 << REISERFS_ATTRS))
701 seq_puts(seq, ",attrs");
702
703 if (opts & (1 << REISERFS_XATTRS_USER))
704 seq_puts(seq, ",user_xattr");
705
706 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
707 seq_puts(seq, ",expose_privroot");
708
709 if (opts & (1 << REISERFS_POSIXACL))
710 seq_puts(seq, ",acl");
711
712 if (REISERFS_SB(s)->s_jdev)
713 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
714
715 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
716 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
717
718 #ifdef CONFIG_QUOTA
719 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
720 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
721 else if (opts & (1 << REISERFS_USRQUOTA))
722 seq_puts(seq, ",usrquota");
723 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
724 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
725 else if (opts & (1 << REISERFS_GRPQUOTA))
726 seq_puts(seq, ",grpquota");
727 if (REISERFS_SB(s)->s_jquota_fmt) {
728 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
729 seq_puts(seq, ",jqfmt=vfsold");
730 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
731 seq_puts(seq, ",jqfmt=vfsv0");
732 }
733 #endif
734
735 /* Block allocator options */
736 if (opts & (1 << REISERFS_NO_BORDER))
737 seq_puts(seq, ",block-allocator=noborder");
738 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
739 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
740 if (opts & (1 << REISERFS_HASHED_RELOCATION))
741 seq_puts(seq, ",block-allocator=hashed_relocation");
742 if (opts & (1 << REISERFS_TEST4))
743 seq_puts(seq, ",block-allocator=test4");
744 show_alloc_options(seq, s);
745 return 0;
746 }
747
748 #ifdef CONFIG_QUOTA
749 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
750 size_t, loff_t);
751 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
752 loff_t);
753 #endif
754
755 static const struct super_operations reiserfs_sops = {
756 .alloc_inode = reiserfs_alloc_inode,
757 .destroy_inode = reiserfs_destroy_inode,
758 .write_inode = reiserfs_write_inode,
759 .dirty_inode = reiserfs_dirty_inode,
760 .evict_inode = reiserfs_evict_inode,
761 .put_super = reiserfs_put_super,
762 .sync_fs = reiserfs_sync_fs,
763 .freeze_fs = reiserfs_freeze,
764 .unfreeze_fs = reiserfs_unfreeze,
765 .statfs = reiserfs_statfs,
766 .remount_fs = reiserfs_remount,
767 .show_options = reiserfs_show_options,
768 #ifdef CONFIG_QUOTA
769 .quota_read = reiserfs_quota_read,
770 .quota_write = reiserfs_quota_write,
771 #endif
772 };
773
774 #ifdef CONFIG_QUOTA
775 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
776
777 static int reiserfs_write_dquot(struct dquot *);
778 static int reiserfs_acquire_dquot(struct dquot *);
779 static int reiserfs_release_dquot(struct dquot *);
780 static int reiserfs_mark_dquot_dirty(struct dquot *);
781 static int reiserfs_write_info(struct super_block *, int);
782 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
783
784 static const struct dquot_operations reiserfs_quota_operations = {
785 .write_dquot = reiserfs_write_dquot,
786 .acquire_dquot = reiserfs_acquire_dquot,
787 .release_dquot = reiserfs_release_dquot,
788 .mark_dirty = reiserfs_mark_dquot_dirty,
789 .write_info = reiserfs_write_info,
790 .alloc_dquot = dquot_alloc,
791 .destroy_dquot = dquot_destroy,
792 };
793
794 static const struct quotactl_ops reiserfs_qctl_operations = {
795 .quota_on = reiserfs_quota_on,
796 .quota_off = dquot_quota_off,
797 .quota_sync = dquot_quota_sync,
798 .get_info = dquot_get_dqinfo,
799 .set_info = dquot_set_dqinfo,
800 .get_dqblk = dquot_get_dqblk,
801 .set_dqblk = dquot_set_dqblk,
802 };
803 #endif
804
805 static const struct export_operations reiserfs_export_ops = {
806 .encode_fh = reiserfs_encode_fh,
807 .fh_to_dentry = reiserfs_fh_to_dentry,
808 .fh_to_parent = reiserfs_fh_to_parent,
809 .get_parent = reiserfs_get_parent,
810 };
811
812 /*
813 * this struct is used in reiserfs_getopt () for containing the value for
814 * those mount options that have values rather than being toggles.
815 */
816 typedef struct {
817 char *value;
818 /*
819 * bitmask which is to set on mount_options bitmask
820 * when this value is found, 0 is no bits are to be changed.
821 */
822 int setmask;
823 /*
824 * bitmask which is to clear on mount_options bitmask
825 * when this value is found, 0 is no bits are to be changed.
826 * This is applied BEFORE setmask
827 */
828 int clrmask;
829 } arg_desc_t;
830
831 /* Set this bit in arg_required to allow empty arguments */
832 #define REISERFS_OPT_ALLOWEMPTY 31
833
834 /*
835 * this struct is used in reiserfs_getopt() for describing the
836 * set of reiserfs mount options
837 */
838 typedef struct {
839 char *option_name;
840
841 /* 0 if argument is not required, not 0 otherwise */
842 int arg_required;
843
844 /* list of values accepted by an option */
845 const arg_desc_t *values;
846
847 /*
848 * bitmask which is to set on mount_options bitmask
849 * when this value is found, 0 is no bits are to be changed.
850 */
851 int setmask;
852
853 /*
854 * bitmask which is to clear on mount_options bitmask
855 * when this value is found, 0 is no bits are to be changed.
856 * This is applied BEFORE setmask
857 */
858 int clrmask;
859 } opt_desc_t;
860
861 /* possible values for -o data= */
862 static const arg_desc_t logging_mode[] = {
863 {"ordered", 1 << REISERFS_DATA_ORDERED,
864 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
865 {"journal", 1 << REISERFS_DATA_LOG,
866 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
867 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
868 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
869 {.value = NULL}
870 };
871
872 /* possible values for -o barrier= */
873 static const arg_desc_t barrier_mode[] = {
874 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
875 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
876 {.value = NULL}
877 };
878
879 /*
880 * possible values for "-o block-allocator=" and bits which are to be set in
881 * s_mount_opt of reiserfs specific part of in-core super block
882 */
883 static const arg_desc_t balloc[] = {
884 {"noborder", 1 << REISERFS_NO_BORDER, 0},
885 {"border", 0, 1 << REISERFS_NO_BORDER},
886 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
887 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
888 {"test4", 1 << REISERFS_TEST4, 0},
889 {"notest4", 0, 1 << REISERFS_TEST4},
890 {NULL, 0, 0}
891 };
892
893 static const arg_desc_t tails[] = {
894 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
895 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
896 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
897 {NULL, 0, 0}
898 };
899
900 static const arg_desc_t error_actions[] = {
901 {"panic", 1 << REISERFS_ERROR_PANIC,
902 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
903 {"ro-remount", 1 << REISERFS_ERROR_RO,
904 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
905 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
906 {"continue", 1 << REISERFS_ERROR_CONTINUE,
907 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
908 #endif
909 {NULL, 0, 0},
910 };
911
912 /*
913 * proceed only one option from a list *cur - string containing of mount
914 * options
915 * opts - array of options which are accepted
916 * opt_arg - if option is found and requires an argument and if it is specifed
917 * in the input - pointer to the argument is stored here
918 * bit_flags - if option requires to set a certain bit - it is set here
919 * return -1 if unknown option is found, opt->arg_required otherwise
920 */
921 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
922 char **opt_arg, unsigned long *bit_flags)
923 {
924 char *p;
925 /*
926 * foo=bar,
927 * ^ ^ ^
928 * | | +-- option_end
929 * | +-- arg_start
930 * +-- option_start
931 */
932 const opt_desc_t *opt;
933 const arg_desc_t *arg;
934
935 p = *cur;
936
937 /* assume argument cannot contain commas */
938 *cur = strchr(p, ',');
939 if (*cur) {
940 *(*cur) = '\0';
941 (*cur)++;
942 }
943
944 if (!strncmp(p, "alloc=", 6)) {
945 /*
946 * Ugly special case, probably we should redo options
947 * parser so that it can understand several arguments for
948 * some options, also so that it can fill several bitfields
949 * with option values.
950 */
951 if (reiserfs_parse_alloc_options(s, p + 6)) {
952 return -1;
953 } else {
954 return 0;
955 }
956 }
957
958 /* for every option in the list */
959 for (opt = opts; opt->option_name; opt++) {
960 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
961 if (bit_flags) {
962 if (opt->clrmask ==
963 (1 << REISERFS_UNSUPPORTED_OPT))
964 reiserfs_warning(s, "super-6500",
965 "%s not supported.\n",
966 p);
967 else
968 *bit_flags &= ~opt->clrmask;
969 if (opt->setmask ==
970 (1 << REISERFS_UNSUPPORTED_OPT))
971 reiserfs_warning(s, "super-6501",
972 "%s not supported.\n",
973 p);
974 else
975 *bit_flags |= opt->setmask;
976 }
977 break;
978 }
979 }
980 if (!opt->option_name) {
981 reiserfs_warning(s, "super-6502",
982 "unknown mount option \"%s\"", p);
983 return -1;
984 }
985
986 p += strlen(opt->option_name);
987 switch (*p) {
988 case '=':
989 if (!opt->arg_required) {
990 reiserfs_warning(s, "super-6503",
991 "the option \"%s\" does not "
992 "require an argument\n",
993 opt->option_name);
994 return -1;
995 }
996 break;
997
998 case 0:
999 if (opt->arg_required) {
1000 reiserfs_warning(s, "super-6504",
1001 "the option \"%s\" requires an "
1002 "argument\n", opt->option_name);
1003 return -1;
1004 }
1005 break;
1006 default:
1007 reiserfs_warning(s, "super-6505",
1008 "head of option \"%s\" is only correct\n",
1009 opt->option_name);
1010 return -1;
1011 }
1012
1013 /*
1014 * move to the argument, or to next option if argument is not
1015 * required
1016 */
1017 p++;
1018
1019 if (opt->arg_required
1020 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1021 && !strlen(p)) {
1022 /* this catches "option=," if not allowed */
1023 reiserfs_warning(s, "super-6506",
1024 "empty argument for \"%s\"\n",
1025 opt->option_name);
1026 return -1;
1027 }
1028
1029 if (!opt->values) {
1030 /* *=NULLopt_arg contains pointer to argument */
1031 *opt_arg = p;
1032 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1033 }
1034
1035 /* values possible for this option are listed in opt->values */
1036 for (arg = opt->values; arg->value; arg++) {
1037 if (!strcmp(p, arg->value)) {
1038 if (bit_flags) {
1039 *bit_flags &= ~arg->clrmask;
1040 *bit_flags |= arg->setmask;
1041 }
1042 return opt->arg_required;
1043 }
1044 }
1045
1046 reiserfs_warning(s, "super-6506",
1047 "bad value \"%s\" for option \"%s\"\n", p,
1048 opt->option_name);
1049 return -1;
1050 }
1051
1052 /* returns 0 if something is wrong in option string, 1 - otherwise */
1053 static int reiserfs_parse_options(struct super_block *s,
1054
1055 /* string given via mount's -o */
1056 char *options,
1057
1058 /*
1059 * after the parsing phase, contains the
1060 * collection of bitflags defining what
1061 * mount options were selected.
1062 */
1063 unsigned long *mount_options,
1064
1065 /* strtol-ed from NNN of resize=NNN */
1066 unsigned long *blocks,
1067 char **jdev_name,
1068 unsigned int *commit_max_age,
1069 char **qf_names,
1070 unsigned int *qfmt)
1071 {
1072 int c;
1073 char *arg = NULL;
1074 char *pos;
1075 opt_desc_t opts[] = {
1076 /*
1077 * Compatibility stuff, so that -o notail for old
1078 * setups still work
1079 */
1080 {"tails",.arg_required = 't',.values = tails},
1081 {"notail",.clrmask =
1082 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1083 {"conv",.setmask = 1 << REISERFS_CONVERT},
1084 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1085 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1086 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1087 #ifdef CONFIG_REISERFS_FS_XATTR
1088 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1089 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1090 #else
1091 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1092 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1093 #endif
1094 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1095 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1096 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1097 #else
1098 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1099 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1100 #endif
1101 {.option_name = "nolog"},
1102 {"replayonly",.setmask = 1 << REPLAYONLY},
1103 {"block-allocator",.arg_required = 'a',.values = balloc},
1104 {"data",.arg_required = 'd',.values = logging_mode},
1105 {"barrier",.arg_required = 'b',.values = barrier_mode},
1106 {"resize",.arg_required = 'r',.values = NULL},
1107 {"jdev",.arg_required = 'j',.values = NULL},
1108 {"nolargeio",.arg_required = 'w',.values = NULL},
1109 {"commit",.arg_required = 'c',.values = NULL},
1110 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1111 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1112 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1113 {"errors",.arg_required = 'e',.values = error_actions},
1114 {"usrjquota",.arg_required =
1115 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1116 {"grpjquota",.arg_required =
1117 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1118 {"jqfmt",.arg_required = 'f',.values = NULL},
1119 {.option_name = NULL}
1120 };
1121
1122 *blocks = 0;
1123 if (!options || !*options)
1124 /*
1125 * use default configuration: create tails, journaling on, no
1126 * conversion to newest format
1127 */
1128 return 1;
1129
1130 for (pos = options; pos;) {
1131 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1132 if (c == -1)
1133 /* wrong option is given */
1134 return 0;
1135
1136 if (c == 'r') {
1137 char *p;
1138
1139 p = NULL;
1140 /* "resize=NNN" or "resize=auto" */
1141
1142 if (!strcmp(arg, "auto")) {
1143 /* From JFS code, to auto-get the size. */
1144 *blocks =
1145 s->s_bdev->bd_inode->i_size >> s->
1146 s_blocksize_bits;
1147 } else {
1148 *blocks = simple_strtoul(arg, &p, 0);
1149 if (*p != '\0') {
1150 /* NNN does not look like a number */
1151 reiserfs_warning(s, "super-6507",
1152 "bad value %s for "
1153 "-oresize\n", arg);
1154 return 0;
1155 }
1156 }
1157 }
1158
1159 if (c == 'c') {
1160 char *p = NULL;
1161 unsigned long val = simple_strtoul(arg, &p, 0);
1162 /* commit=NNN (time in seconds) */
1163 if (*p != '\0' || val >= (unsigned int)-1) {
1164 reiserfs_warning(s, "super-6508",
1165 "bad value %s for -ocommit\n",
1166 arg);
1167 return 0;
1168 }
1169 *commit_max_age = (unsigned int)val;
1170 }
1171
1172 if (c == 'w') {
1173 reiserfs_warning(s, "super-6509", "nolargeio option "
1174 "is no longer supported");
1175 return 0;
1176 }
1177
1178 if (c == 'j') {
1179 if (arg && *arg && jdev_name) {
1180 /* Hm, already assigned? */
1181 if (*jdev_name) {
1182 reiserfs_warning(s, "super-6510",
1183 "journal device was "
1184 "already specified to "
1185 "be %s", *jdev_name);
1186 return 0;
1187 }
1188 *jdev_name = arg;
1189 }
1190 }
1191 #ifdef CONFIG_QUOTA
1192 if (c == 'u' || c == 'g') {
1193 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1194
1195 if (sb_any_quota_loaded(s) &&
1196 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1197 reiserfs_warning(s, "super-6511",
1198 "cannot change journaled "
1199 "quota options when quota "
1200 "turned on.");
1201 return 0;
1202 }
1203 if (*arg) { /* Some filename specified? */
1204 if (REISERFS_SB(s)->s_qf_names[qtype]
1205 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1206 arg)) {
1207 reiserfs_warning(s, "super-6512",
1208 "%s quota file "
1209 "already specified.",
1210 QTYPE2NAME(qtype));
1211 return 0;
1212 }
1213 if (strchr(arg, '/')) {
1214 reiserfs_warning(s, "super-6513",
1215 "quotafile must be "
1216 "on filesystem root.");
1217 return 0;
1218 }
1219 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1220 if (!qf_names[qtype]) {
1221 reiserfs_warning(s, "reiserfs-2502",
1222 "not enough memory "
1223 "for storing "
1224 "quotafile name.");
1225 return 0;
1226 }
1227 if (qtype == USRQUOTA)
1228 *mount_options |= 1 << REISERFS_USRQUOTA;
1229 else
1230 *mount_options |= 1 << REISERFS_GRPQUOTA;
1231 } else {
1232 if (qf_names[qtype] !=
1233 REISERFS_SB(s)->s_qf_names[qtype])
1234 kfree(qf_names[qtype]);
1235 qf_names[qtype] = NULL;
1236 if (qtype == USRQUOTA)
1237 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1238 else
1239 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1240 }
1241 }
1242 if (c == 'f') {
1243 if (!strcmp(arg, "vfsold"))
1244 *qfmt = QFMT_VFS_OLD;
1245 else if (!strcmp(arg, "vfsv0"))
1246 *qfmt = QFMT_VFS_V0;
1247 else {
1248 reiserfs_warning(s, "super-6514",
1249 "unknown quota format "
1250 "specified.");
1251 return 0;
1252 }
1253 if (sb_any_quota_loaded(s) &&
1254 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1255 reiserfs_warning(s, "super-6515",
1256 "cannot change journaled "
1257 "quota options when quota "
1258 "turned on.");
1259 return 0;
1260 }
1261 }
1262 #else
1263 if (c == 'u' || c == 'g' || c == 'f') {
1264 reiserfs_warning(s, "reiserfs-2503", "journaled "
1265 "quota options not supported.");
1266 return 0;
1267 }
1268 #endif
1269 }
1270
1271 #ifdef CONFIG_QUOTA
1272 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1273 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1274 reiserfs_warning(s, "super-6515",
1275 "journaled quota format not specified.");
1276 return 0;
1277 }
1278 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1279 sb_has_quota_loaded(s, USRQUOTA)) ||
1280 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1281 sb_has_quota_loaded(s, GRPQUOTA))) {
1282 reiserfs_warning(s, "super-6516", "quota options must "
1283 "be present when quota is turned on.");
1284 return 0;
1285 }
1286 #endif
1287
1288 return 1;
1289 }
1290
1291 static void switch_data_mode(struct super_block *s, unsigned long mode)
1292 {
1293 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1294 (1 << REISERFS_DATA_ORDERED) |
1295 (1 << REISERFS_DATA_WRITEBACK));
1296 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1297 }
1298
1299 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1300 {
1301 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1302 if (!reiserfs_data_log(s)) {
1303 switch_data_mode(s, REISERFS_DATA_LOG);
1304 reiserfs_info(s, "switching to journaled data mode\n");
1305 }
1306 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1307 if (!reiserfs_data_ordered(s)) {
1308 switch_data_mode(s, REISERFS_DATA_ORDERED);
1309 reiserfs_info(s, "switching to ordered data mode\n");
1310 }
1311 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1312 if (!reiserfs_data_writeback(s)) {
1313 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1314 reiserfs_info(s, "switching to writeback data mode\n");
1315 }
1316 }
1317 }
1318
1319 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1320 {
1321 int flush = (1 << REISERFS_BARRIER_FLUSH);
1322 int none = (1 << REISERFS_BARRIER_NONE);
1323 int all_barrier = flush | none;
1324
1325 if (bits & all_barrier) {
1326 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1327 if (bits & flush) {
1328 REISERFS_SB(s)->s_mount_opt |= flush;
1329 printk("reiserfs: enabling write barrier flush mode\n");
1330 } else if (bits & none) {
1331 REISERFS_SB(s)->s_mount_opt |= none;
1332 printk("reiserfs: write barriers turned off\n");
1333 }
1334 }
1335 }
1336
1337 static void handle_attrs(struct super_block *s)
1338 {
1339 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1340
1341 if (reiserfs_attrs(s)) {
1342 if (old_format_only(s)) {
1343 reiserfs_warning(s, "super-6517", "cannot support "
1344 "attributes on 3.5.x disk format");
1345 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1346 return;
1347 }
1348 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1349 reiserfs_warning(s, "super-6518", "cannot support "
1350 "attributes until flag is set in "
1351 "super-block");
1352 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1353 }
1354 }
1355 }
1356
1357 #ifdef CONFIG_QUOTA
1358 static void handle_quota_files(struct super_block *s, char **qf_names,
1359 unsigned int *qfmt)
1360 {
1361 int i;
1362
1363 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1364 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1365 kfree(REISERFS_SB(s)->s_qf_names[i]);
1366 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1367 }
1368 if (*qfmt)
1369 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1370 }
1371 #endif
1372
1373 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1374 {
1375 struct reiserfs_super_block *rs;
1376 struct reiserfs_transaction_handle th;
1377 unsigned long blocks;
1378 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1379 unsigned long safe_mask = 0;
1380 unsigned int commit_max_age = (unsigned int)-1;
1381 struct reiserfs_journal *journal = SB_JOURNAL(s);
1382 char *new_opts = kstrdup(arg, GFP_KERNEL);
1383 int err;
1384 char *qf_names[REISERFS_MAXQUOTAS];
1385 unsigned int qfmt = 0;
1386 #ifdef CONFIG_QUOTA
1387 int i;
1388 #endif
1389
1390 sync_filesystem(s);
1391 reiserfs_write_lock(s);
1392
1393 #ifdef CONFIG_QUOTA
1394 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1395 #endif
1396
1397 rs = SB_DISK_SUPER_BLOCK(s);
1398
1399 if (!reiserfs_parse_options
1400 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1401 qf_names, &qfmt)) {
1402 #ifdef CONFIG_QUOTA
1403 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1404 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1405 kfree(qf_names[i]);
1406 #endif
1407 err = -EINVAL;
1408 goto out_err_unlock;
1409 }
1410 #ifdef CONFIG_QUOTA
1411 handle_quota_files(s, qf_names, &qfmt);
1412 #endif
1413
1414 handle_attrs(s);
1415
1416 /* Add options that are safe here */
1417 safe_mask |= 1 << REISERFS_SMALLTAIL;
1418 safe_mask |= 1 << REISERFS_LARGETAIL;
1419 safe_mask |= 1 << REISERFS_NO_BORDER;
1420 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1421 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1422 safe_mask |= 1 << REISERFS_TEST4;
1423 safe_mask |= 1 << REISERFS_ATTRS;
1424 safe_mask |= 1 << REISERFS_XATTRS_USER;
1425 safe_mask |= 1 << REISERFS_POSIXACL;
1426 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1427 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1428 safe_mask |= 1 << REISERFS_ERROR_RO;
1429 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1430 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1431 safe_mask |= 1 << REISERFS_USRQUOTA;
1432 safe_mask |= 1 << REISERFS_GRPQUOTA;
1433
1434 /*
1435 * Update the bitmask, taking care to keep
1436 * the bits we're not allowed to change here
1437 */
1438 REISERFS_SB(s)->s_mount_opt =
1439 (REISERFS_SB(s)->
1440 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1441
1442 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1443 journal->j_max_commit_age = commit_max_age;
1444 journal->j_max_trans_age = commit_max_age;
1445 } else if (commit_max_age == 0) {
1446 /* 0 means restore defaults. */
1447 journal->j_max_commit_age = journal->j_default_max_commit_age;
1448 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1449 }
1450
1451 if (blocks) {
1452 err = reiserfs_resize(s, blocks);
1453 if (err != 0)
1454 goto out_err_unlock;
1455 }
1456
1457 if (*mount_flags & MS_RDONLY) {
1458 reiserfs_write_unlock(s);
1459 reiserfs_xattr_init(s, *mount_flags);
1460 /* remount read-only */
1461 if (s->s_flags & MS_RDONLY)
1462 /* it is read-only already */
1463 goto out_ok_unlocked;
1464
1465 err = dquot_suspend(s, -1);
1466 if (err < 0)
1467 goto out_err;
1468
1469 /* try to remount file system with read-only permissions */
1470 if (sb_umount_state(rs) == REISERFS_VALID_FS
1471 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1472 goto out_ok_unlocked;
1473 }
1474
1475 reiserfs_write_lock(s);
1476
1477 err = journal_begin(&th, s, 10);
1478 if (err)
1479 goto out_err_unlock;
1480
1481 /* Mounting a rw partition read-only. */
1482 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1483 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1484 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1485 } else {
1486 /* remount read-write */
1487 if (!(s->s_flags & MS_RDONLY)) {
1488 reiserfs_write_unlock(s);
1489 reiserfs_xattr_init(s, *mount_flags);
1490 goto out_ok_unlocked; /* We are read-write already */
1491 }
1492
1493 if (reiserfs_is_journal_aborted(journal)) {
1494 err = journal->j_errno;
1495 goto out_err_unlock;
1496 }
1497
1498 handle_data_mode(s, mount_options);
1499 handle_barrier_mode(s, mount_options);
1500 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1501
1502 /* now it is safe to call journal_begin */
1503 s->s_flags &= ~MS_RDONLY;
1504 err = journal_begin(&th, s, 10);
1505 if (err)
1506 goto out_err_unlock;
1507
1508 /* Mount a partition which is read-only, read-write */
1509 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1510 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1511 s->s_flags &= ~MS_RDONLY;
1512 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1513 if (!old_format_only(s))
1514 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1515 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1516 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1517 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1518 }
1519 /* this will force a full flush of all journal lists */
1520 SB_JOURNAL(s)->j_must_wait = 1;
1521 err = journal_end(&th);
1522 if (err)
1523 goto out_err_unlock;
1524
1525 reiserfs_write_unlock(s);
1526 if (!(*mount_flags & MS_RDONLY)) {
1527 dquot_resume(s, -1);
1528 reiserfs_write_lock(s);
1529 finish_unfinished(s);
1530 reiserfs_write_unlock(s);
1531 reiserfs_xattr_init(s, *mount_flags);
1532 }
1533
1534 out_ok_unlocked:
1535 replace_mount_options(s, new_opts);
1536 return 0;
1537
1538 out_err_unlock:
1539 reiserfs_write_unlock(s);
1540 out_err:
1541 kfree(new_opts);
1542 return err;
1543 }
1544
1545 static int read_super_block(struct super_block *s, int offset)
1546 {
1547 struct buffer_head *bh;
1548 struct reiserfs_super_block *rs;
1549 int fs_blocksize;
1550
1551 bh = sb_bread(s, offset / s->s_blocksize);
1552 if (!bh) {
1553 reiserfs_warning(s, "sh-2006",
1554 "bread failed (dev %s, block %lu, size %lu)",
1555 s->s_id, offset / s->s_blocksize,
1556 s->s_blocksize);
1557 return 1;
1558 }
1559
1560 rs = (struct reiserfs_super_block *)bh->b_data;
1561 if (!is_any_reiserfs_magic_string(rs)) {
1562 brelse(bh);
1563 return 1;
1564 }
1565 /*
1566 * ok, reiserfs signature (old or new) found in at the given offset
1567 */
1568 fs_blocksize = sb_blocksize(rs);
1569 brelse(bh);
1570 sb_set_blocksize(s, fs_blocksize);
1571
1572 bh = sb_bread(s, offset / s->s_blocksize);
1573 if (!bh) {
1574 reiserfs_warning(s, "sh-2007",
1575 "bread failed (dev %s, block %lu, size %lu)",
1576 s->s_id, offset / s->s_blocksize,
1577 s->s_blocksize);
1578 return 1;
1579 }
1580
1581 rs = (struct reiserfs_super_block *)bh->b_data;
1582 if (sb_blocksize(rs) != s->s_blocksize) {
1583 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1584 "filesystem on (dev %s, block %llu, size %lu)",
1585 s->s_id,
1586 (unsigned long long)bh->b_blocknr,
1587 s->s_blocksize);
1588 brelse(bh);
1589 return 1;
1590 }
1591
1592 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1593 brelse(bh);
1594 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1595 "--rebuild-tree run detected. Please run\n"
1596 "reiserfsck --rebuild-tree and wait for a "
1597 "completion. If that fails\n"
1598 "get newer reiserfsprogs package");
1599 return 1;
1600 }
1601
1602 SB_BUFFER_WITH_SB(s) = bh;
1603 SB_DISK_SUPER_BLOCK(s) = rs;
1604
1605 /*
1606 * magic is of non-standard journal filesystem, look at s_version to
1607 * find which format is in use
1608 */
1609 if (is_reiserfs_jr(rs)) {
1610 if (sb_version(rs) == REISERFS_VERSION_2)
1611 reiserfs_info(s, "found reiserfs format \"3.6\""
1612 " with non-standard journal\n");
1613 else if (sb_version(rs) == REISERFS_VERSION_1)
1614 reiserfs_info(s, "found reiserfs format \"3.5\""
1615 " with non-standard journal\n");
1616 else {
1617 reiserfs_warning(s, "sh-2012", "found unknown "
1618 "format \"%u\" of reiserfs with "
1619 "non-standard magic", sb_version(rs));
1620 return 1;
1621 }
1622 } else
1623 /*
1624 * s_version of standard format may contain incorrect
1625 * information, so we just look at the magic string
1626 */
1627 reiserfs_info(s,
1628 "found reiserfs format \"%s\" with standard journal\n",
1629 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1630
1631 s->s_op = &reiserfs_sops;
1632 s->s_export_op = &reiserfs_export_ops;
1633 #ifdef CONFIG_QUOTA
1634 s->s_qcop = &reiserfs_qctl_operations;
1635 s->dq_op = &reiserfs_quota_operations;
1636 #endif
1637
1638 /*
1639 * new format is limited by the 32 bit wide i_blocks field, want to
1640 * be one full block below that.
1641 */
1642 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1643 return 0;
1644 }
1645
1646 /* after journal replay, reread all bitmap and super blocks */
1647 static int reread_meta_blocks(struct super_block *s)
1648 {
1649 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1650 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1651 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1652 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1653 return 1;
1654 }
1655
1656 return 0;
1657 }
1658
1659 /* hash detection stuff */
1660
1661 /*
1662 * if root directory is empty - we set default - Yura's - hash and
1663 * warn about it
1664 * FIXME: we look for only one name in a directory. If tea and yura
1665 * both have the same value - we ask user to send report to the
1666 * mailing list
1667 */
1668 static __u32 find_hash_out(struct super_block *s)
1669 {
1670 int retval;
1671 struct inode *inode;
1672 struct cpu_key key;
1673 INITIALIZE_PATH(path);
1674 struct reiserfs_dir_entry de;
1675 struct reiserfs_de_head *deh;
1676 __u32 hash = DEFAULT_HASH;
1677 __u32 deh_hashval, teahash, r5hash, yurahash;
1678
1679 inode = s->s_root->d_inode;
1680
1681 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1682 retval = search_by_entry_key(s, &key, &path, &de);
1683 if (retval == IO_ERROR) {
1684 pathrelse(&path);
1685 return UNSET_HASH;
1686 }
1687 if (retval == NAME_NOT_FOUND)
1688 de.de_entry_num--;
1689
1690 set_de_name_and_namelen(&de);
1691 deh = de.de_deh + de.de_entry_num;
1692
1693 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1694 /* allow override in this case */
1695 if (reiserfs_rupasov_hash(s))
1696 hash = YURA_HASH;
1697 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1698 goto out;
1699 }
1700
1701 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1702 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1703 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1704 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1705
1706 if ((teahash == r5hash && deh_hashval == r5hash) ||
1707 (teahash == yurahash && deh_hashval == yurahash) ||
1708 (r5hash == yurahash && deh_hashval == yurahash)) {
1709 reiserfs_warning(s, "reiserfs-2506",
1710 "Unable to automatically detect hash "
1711 "function. Please mount with -o "
1712 "hash={tea,rupasov,r5}");
1713 hash = UNSET_HASH;
1714 goto out;
1715 }
1716
1717 if (deh_hashval == yurahash)
1718 hash = YURA_HASH;
1719 else if (deh_hashval == teahash)
1720 hash = TEA_HASH;
1721 else if (deh_hashval == r5hash)
1722 hash = R5_HASH;
1723 else {
1724 reiserfs_warning(s, "reiserfs-2506",
1725 "Unrecognised hash function");
1726 hash = UNSET_HASH;
1727 }
1728 out:
1729 pathrelse(&path);
1730 return hash;
1731 }
1732
1733 /* finds out which hash names are sorted with */
1734 static int what_hash(struct super_block *s)
1735 {
1736 __u32 code;
1737
1738 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1739
1740 /*
1741 * reiserfs_hash_detect() == true if any of the hash mount options
1742 * were used. We must check them to make sure the user isn't
1743 * using a bad hash value
1744 */
1745 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1746 code = find_hash_out(s);
1747
1748 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1749 /*
1750 * detection has found the hash, and we must check against the
1751 * mount options
1752 */
1753 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1754 reiserfs_warning(s, "reiserfs-2507",
1755 "Error, %s hash detected, "
1756 "unable to force rupasov hash",
1757 reiserfs_hashname(code));
1758 code = UNSET_HASH;
1759 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1760 reiserfs_warning(s, "reiserfs-2508",
1761 "Error, %s hash detected, "
1762 "unable to force tea hash",
1763 reiserfs_hashname(code));
1764 code = UNSET_HASH;
1765 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1766 reiserfs_warning(s, "reiserfs-2509",
1767 "Error, %s hash detected, "
1768 "unable to force r5 hash",
1769 reiserfs_hashname(code));
1770 code = UNSET_HASH;
1771 }
1772 } else {
1773 /*
1774 * find_hash_out was not called or
1775 * could not determine the hash
1776 */
1777 if (reiserfs_rupasov_hash(s)) {
1778 code = YURA_HASH;
1779 } else if (reiserfs_tea_hash(s)) {
1780 code = TEA_HASH;
1781 } else if (reiserfs_r5_hash(s)) {
1782 code = R5_HASH;
1783 }
1784 }
1785
1786 /*
1787 * if we are mounted RW, and we have a new valid hash code, update
1788 * the super
1789 */
1790 if (code != UNSET_HASH &&
1791 !(s->s_flags & MS_RDONLY) &&
1792 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1793 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1794 }
1795 return code;
1796 }
1797
1798 /* return pointer to appropriate function */
1799 static hashf_t hash_function(struct super_block *s)
1800 {
1801 switch (what_hash(s)) {
1802 case TEA_HASH:
1803 reiserfs_info(s, "Using tea hash to sort names\n");
1804 return keyed_hash;
1805 case YURA_HASH:
1806 reiserfs_info(s, "Using rupasov hash to sort names\n");
1807 return yura_hash;
1808 case R5_HASH:
1809 reiserfs_info(s, "Using r5 hash to sort names\n");
1810 return r5_hash;
1811 }
1812 return NULL;
1813 }
1814
1815 /* this is used to set up correct value for old partitions */
1816 static int function2code(hashf_t func)
1817 {
1818 if (func == keyed_hash)
1819 return TEA_HASH;
1820 if (func == yura_hash)
1821 return YURA_HASH;
1822 if (func == r5_hash)
1823 return R5_HASH;
1824
1825 BUG(); /* should never happen */
1826
1827 return 0;
1828 }
1829
1830 #define SWARN(silent, s, id, ...) \
1831 if (!(silent)) \
1832 reiserfs_warning(s, id, __VA_ARGS__)
1833
1834 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1835 {
1836 struct inode *root_inode;
1837 struct reiserfs_transaction_handle th;
1838 int old_format = 0;
1839 unsigned long blocks;
1840 unsigned int commit_max_age = 0;
1841 int jinit_done = 0;
1842 struct reiserfs_iget_args args;
1843 struct reiserfs_super_block *rs;
1844 char *jdev_name;
1845 struct reiserfs_sb_info *sbi;
1846 int errval = -EINVAL;
1847 char *qf_names[REISERFS_MAXQUOTAS] = {};
1848 unsigned int qfmt = 0;
1849
1850 save_mount_options(s, data);
1851
1852 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1853 if (!sbi)
1854 return -ENOMEM;
1855 s->s_fs_info = sbi;
1856 /* Set default values for options: non-aggressive tails, RO on errors */
1857 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1858 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1859 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1860 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1861 sbi->s_alloc_options.preallocmin = 0;
1862 /* Preallocate by 16 blocks (17-1) at once */
1863 sbi->s_alloc_options.preallocsize = 17;
1864 /* setup default block allocator options */
1865 reiserfs_init_alloc_options(s);
1866
1867 spin_lock_init(&sbi->old_work_lock);
1868 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1869 mutex_init(&sbi->lock);
1870 sbi->lock_depth = -1;
1871
1872 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1873 s->s_id);
1874 if (!sbi->commit_wq) {
1875 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1876 errval = -ENOMEM;
1877 goto error_unlocked;
1878 }
1879
1880 jdev_name = NULL;
1881 if (reiserfs_parse_options
1882 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1883 &commit_max_age, qf_names, &qfmt) == 0) {
1884 goto error_unlocked;
1885 }
1886 if (jdev_name && jdev_name[0]) {
1887 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1888 if (!sbi->s_jdev) {
1889 SWARN(silent, s, "", "Cannot allocate memory for "
1890 "journal device name");
1891 goto error;
1892 }
1893 }
1894 #ifdef CONFIG_QUOTA
1895 handle_quota_files(s, qf_names, &qfmt);
1896 #endif
1897
1898 if (blocks) {
1899 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1900 goto error_unlocked;
1901 }
1902
1903 /*
1904 * try old format (undistributed bitmap, super block in 8-th 1k
1905 * block of a device)
1906 */
1907 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1908 old_format = 1;
1909
1910 /*
1911 * try new format (64-th 1k block), which can contain reiserfs
1912 * super block
1913 */
1914 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1915 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1916 s->s_id);
1917 goto error_unlocked;
1918 }
1919
1920 rs = SB_DISK_SUPER_BLOCK(s);
1921 /*
1922 * Let's do basic sanity check to verify that underlying device is not
1923 * smaller than the filesystem. If the check fails then abort and
1924 * scream, because bad stuff will happen otherwise.
1925 */
1926 if (s->s_bdev && s->s_bdev->bd_inode
1927 && i_size_read(s->s_bdev->bd_inode) <
1928 sb_block_count(rs) * sb_blocksize(rs)) {
1929 SWARN(silent, s, "", "Filesystem cannot be "
1930 "mounted because it is bigger than the device");
1931 SWARN(silent, s, "", "You may need to run fsck "
1932 "or increase size of your LVM partition");
1933 SWARN(silent, s, "", "Or may be you forgot to "
1934 "reboot after fdisk when it told you to");
1935 goto error_unlocked;
1936 }
1937
1938 sbi->s_mount_state = SB_REISERFS_STATE(s);
1939 sbi->s_mount_state = REISERFS_VALID_FS;
1940
1941 if ((errval = reiserfs_init_bitmap_cache(s))) {
1942 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1943 goto error_unlocked;
1944 }
1945
1946 errval = -EINVAL;
1947 #ifdef CONFIG_REISERFS_CHECK
1948 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1949 SWARN(silent, s, "", "- it is slow mode for debugging.");
1950 #endif
1951
1952 /* make data=ordered the default */
1953 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1954 !reiserfs_data_writeback(s)) {
1955 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1956 }
1957
1958 if (reiserfs_data_log(s)) {
1959 reiserfs_info(s, "using journaled data mode\n");
1960 } else if (reiserfs_data_ordered(s)) {
1961 reiserfs_info(s, "using ordered data mode\n");
1962 } else {
1963 reiserfs_info(s, "using writeback data mode\n");
1964 }
1965 if (reiserfs_barrier_flush(s)) {
1966 printk("reiserfs: using flush barriers\n");
1967 }
1968
1969 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1970 SWARN(silent, s, "sh-2022",
1971 "unable to initialize journal space");
1972 goto error_unlocked;
1973 } else {
1974 /*
1975 * once this is set, journal_release must be called
1976 * if we error out of the mount
1977 */
1978 jinit_done = 1;
1979 }
1980
1981 if (reread_meta_blocks(s)) {
1982 SWARN(silent, s, "jmacd-9",
1983 "unable to reread meta blocks after journal init");
1984 goto error_unlocked;
1985 }
1986
1987 if (replay_only(s))
1988 goto error_unlocked;
1989
1990 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1991 SWARN(silent, s, "clm-7000",
1992 "Detected readonly device, marking FS readonly");
1993 s->s_flags |= MS_RDONLY;
1994 }
1995 args.objectid = REISERFS_ROOT_OBJECTID;
1996 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1997 root_inode =
1998 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1999 reiserfs_init_locked_inode, (void *)&args);
2000 if (!root_inode) {
2001 SWARN(silent, s, "jmacd-10", "get root inode failed");
2002 goto error_unlocked;
2003 }
2004
2005 /*
2006 * This path assumed to be called with the BKL in the old times.
2007 * Now we have inherited the big reiserfs lock from it and many
2008 * reiserfs helpers called in the mount path and elsewhere require
2009 * this lock to be held even if it's not always necessary. Let's be
2010 * conservative and hold it early. The window can be reduced after
2011 * careful review of the code.
2012 */
2013 reiserfs_write_lock(s);
2014
2015 if (root_inode->i_state & I_NEW) {
2016 reiserfs_read_locked_inode(root_inode, &args);
2017 unlock_new_inode(root_inode);
2018 }
2019
2020 s->s_root = d_make_root(root_inode);
2021 if (!s->s_root)
2022 goto error;
2023 /* define and initialize hash function */
2024 sbi->s_hash_function = hash_function(s);
2025 if (sbi->s_hash_function == NULL) {
2026 dput(s->s_root);
2027 s->s_root = NULL;
2028 goto error;
2029 }
2030
2031 if (is_reiserfs_3_5(rs)
2032 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2033 set_bit(REISERFS_3_5, &sbi->s_properties);
2034 else if (old_format)
2035 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2036 else
2037 set_bit(REISERFS_3_6, &sbi->s_properties);
2038
2039 if (!(s->s_flags & MS_RDONLY)) {
2040
2041 errval = journal_begin(&th, s, 1);
2042 if (errval) {
2043 dput(s->s_root);
2044 s->s_root = NULL;
2045 goto error;
2046 }
2047 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2048
2049 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2050 set_sb_fs_state(rs, 0);
2051
2052 /*
2053 * Clear out s_bmap_nr if it would wrap. We can handle this
2054 * case, but older revisions can't. This will cause the
2055 * file system to fail mount on those older implementations,
2056 * avoiding corruption. -jeffm
2057 */
2058 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2059 sb_bmap_nr(rs) != 0) {
2060 reiserfs_warning(s, "super-2030", "This file system "
2061 "claims to use %u bitmap blocks in "
2062 "its super block, but requires %u. "
2063 "Clearing to zero.", sb_bmap_nr(rs),
2064 reiserfs_bmap_count(s));
2065
2066 set_sb_bmap_nr(rs, 0);
2067 }
2068
2069 if (old_format_only(s)) {
2070 /*
2071 * filesystem of format 3.5 either with standard
2072 * or non-standard journal
2073 */
2074 if (convert_reiserfs(s)) {
2075 /* and -o conv is given */
2076 if (!silent)
2077 reiserfs_info(s,
2078 "converting 3.5 filesystem to the 3.6 format");
2079
2080 if (is_reiserfs_3_5(rs))
2081 /*
2082 * put magic string of 3.6 format.
2083 * 2.2 will not be able to
2084 * mount this filesystem anymore
2085 */
2086 memcpy(rs->s_v1.s_magic,
2087 reiserfs_3_6_magic_string,
2088 sizeof
2089 (reiserfs_3_6_magic_string));
2090
2091 set_sb_version(rs, REISERFS_VERSION_2);
2092 reiserfs_convert_objectid_map_v1(s);
2093 set_bit(REISERFS_3_6, &sbi->s_properties);
2094 clear_bit(REISERFS_3_5, &sbi->s_properties);
2095 } else if (!silent) {
2096 reiserfs_info(s, "using 3.5.x disk format\n");
2097 }
2098 } else
2099 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2100
2101
2102 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2103 errval = journal_end(&th);
2104 if (errval) {
2105 dput(s->s_root);
2106 s->s_root = NULL;
2107 goto error;
2108 }
2109
2110 reiserfs_write_unlock(s);
2111 if ((errval = reiserfs_lookup_privroot(s)) ||
2112 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2113 dput(s->s_root);
2114 s->s_root = NULL;
2115 goto error_unlocked;
2116 }
2117 reiserfs_write_lock(s);
2118
2119 /*
2120 * look for files which were to be removed in previous session
2121 */
2122 finish_unfinished(s);
2123 } else {
2124 if (old_format_only(s) && !silent) {
2125 reiserfs_info(s, "using 3.5.x disk format\n");
2126 }
2127
2128 reiserfs_write_unlock(s);
2129 if ((errval = reiserfs_lookup_privroot(s)) ||
2130 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2131 dput(s->s_root);
2132 s->s_root = NULL;
2133 goto error_unlocked;
2134 }
2135 reiserfs_write_lock(s);
2136 }
2137 /*
2138 * mark hash in super block: it could be unset. overwrite should be ok
2139 */
2140 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2141
2142 handle_attrs(s);
2143
2144 reiserfs_proc_info_init(s);
2145
2146 init_waitqueue_head(&(sbi->s_wait));
2147 spin_lock_init(&sbi->bitmap_lock);
2148
2149 reiserfs_write_unlock(s);
2150
2151 return (0);
2152
2153 error:
2154 reiserfs_write_unlock(s);
2155
2156 error_unlocked:
2157 /* kill the commit thread, free journal ram */
2158 if (jinit_done) {
2159 reiserfs_write_lock(s);
2160 journal_release_error(NULL, s);
2161 reiserfs_write_unlock(s);
2162 }
2163
2164 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2165
2166 reiserfs_free_bitmap_cache(s);
2167 if (SB_BUFFER_WITH_SB(s))
2168 brelse(SB_BUFFER_WITH_SB(s));
2169 #ifdef CONFIG_QUOTA
2170 {
2171 int j;
2172 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2173 kfree(qf_names[j]);
2174 }
2175 #endif
2176 kfree(sbi);
2177
2178 s->s_fs_info = NULL;
2179 return errval;
2180 }
2181
2182 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2183 {
2184 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2185
2186 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2187 buf->f_bfree = sb_free_blocks(rs);
2188 buf->f_bavail = buf->f_bfree;
2189 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2190 buf->f_bsize = dentry->d_sb->s_blocksize;
2191 /* changed to accommodate gcc folks. */
2192 buf->f_type = REISERFS_SUPER_MAGIC;
2193 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2194 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2195 sizeof(rs->s_uuid)/2);
2196
2197 return 0;
2198 }
2199
2200 #ifdef CONFIG_QUOTA
2201 static int reiserfs_write_dquot(struct dquot *dquot)
2202 {
2203 struct reiserfs_transaction_handle th;
2204 int ret, err;
2205 int depth;
2206
2207 reiserfs_write_lock(dquot->dq_sb);
2208 ret =
2209 journal_begin(&th, dquot->dq_sb,
2210 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2211 if (ret)
2212 goto out;
2213 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2214 ret = dquot_commit(dquot);
2215 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2216 err = journal_end(&th);
2217 if (!ret && err)
2218 ret = err;
2219 out:
2220 reiserfs_write_unlock(dquot->dq_sb);
2221 return ret;
2222 }
2223
2224 static int reiserfs_acquire_dquot(struct dquot *dquot)
2225 {
2226 struct reiserfs_transaction_handle th;
2227 int ret, err;
2228 int depth;
2229
2230 reiserfs_write_lock(dquot->dq_sb);
2231 ret =
2232 journal_begin(&th, dquot->dq_sb,
2233 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2234 if (ret)
2235 goto out;
2236 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2237 ret = dquot_acquire(dquot);
2238 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2239 err = journal_end(&th);
2240 if (!ret && err)
2241 ret = err;
2242 out:
2243 reiserfs_write_unlock(dquot->dq_sb);
2244 return ret;
2245 }
2246
2247 static int reiserfs_release_dquot(struct dquot *dquot)
2248 {
2249 struct reiserfs_transaction_handle th;
2250 int ret, err;
2251
2252 reiserfs_write_lock(dquot->dq_sb);
2253 ret =
2254 journal_begin(&th, dquot->dq_sb,
2255 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2256 reiserfs_write_unlock(dquot->dq_sb);
2257 if (ret) {
2258 /* Release dquot anyway to avoid endless cycle in dqput() */
2259 dquot_release(dquot);
2260 goto out;
2261 }
2262 ret = dquot_release(dquot);
2263 reiserfs_write_lock(dquot->dq_sb);
2264 err = journal_end(&th);
2265 if (!ret && err)
2266 ret = err;
2267 reiserfs_write_unlock(dquot->dq_sb);
2268 out:
2269 return ret;
2270 }
2271
2272 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2273 {
2274 /* Are we journaling quotas? */
2275 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2276 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2277 dquot_mark_dquot_dirty(dquot);
2278 return reiserfs_write_dquot(dquot);
2279 } else
2280 return dquot_mark_dquot_dirty(dquot);
2281 }
2282
2283 static int reiserfs_write_info(struct super_block *sb, int type)
2284 {
2285 struct reiserfs_transaction_handle th;
2286 int ret, err;
2287 int depth;
2288
2289 /* Data block + inode block */
2290 reiserfs_write_lock(sb);
2291 ret = journal_begin(&th, sb, 2);
2292 if (ret)
2293 goto out;
2294 depth = reiserfs_write_unlock_nested(sb);
2295 ret = dquot_commit_info(sb, type);
2296 reiserfs_write_lock_nested(sb, depth);
2297 err = journal_end(&th);
2298 if (!ret && err)
2299 ret = err;
2300 out:
2301 reiserfs_write_unlock(sb);
2302 return ret;
2303 }
2304
2305 /*
2306 * Turn on quotas during mount time - we need to find the quota file and such...
2307 */
2308 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2309 {
2310 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2311 REISERFS_SB(sb)->s_jquota_fmt, type);
2312 }
2313
2314 /*
2315 * Standard function to be called on quota_on
2316 */
2317 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2318 struct path *path)
2319 {
2320 int err;
2321 struct inode *inode;
2322 struct reiserfs_transaction_handle th;
2323 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2324
2325 reiserfs_write_lock(sb);
2326 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2327 err = -EINVAL;
2328 goto out;
2329 }
2330
2331 /* Quotafile not on the same filesystem? */
2332 if (path->dentry->d_sb != sb) {
2333 err = -EXDEV;
2334 goto out;
2335 }
2336 inode = path->dentry->d_inode;
2337 /*
2338 * We must not pack tails for quota files on reiserfs for quota
2339 * IO to work
2340 */
2341 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2342 err = reiserfs_unpack(inode, NULL);
2343 if (err) {
2344 reiserfs_warning(sb, "super-6520",
2345 "Unpacking tail of quota file failed"
2346 " (%d). Cannot turn on quotas.", err);
2347 err = -EINVAL;
2348 goto out;
2349 }
2350 mark_inode_dirty(inode);
2351 }
2352 /* Journaling quota? */
2353 if (REISERFS_SB(sb)->s_qf_names[type]) {
2354 /* Quotafile not of fs root? */
2355 if (path->dentry->d_parent != sb->s_root)
2356 reiserfs_warning(sb, "super-6521",
2357 "Quota file not on filesystem root. "
2358 "Journalled quota will not work.");
2359 }
2360
2361 /*
2362 * When we journal data on quota file, we have to flush journal to see
2363 * all updates to the file when we bypass pagecache...
2364 */
2365 if (reiserfs_file_data_log(inode)) {
2366 /* Just start temporary transaction and finish it */
2367 err = journal_begin(&th, sb, 1);
2368 if (err)
2369 goto out;
2370 err = journal_end_sync(&th);
2371 if (err)
2372 goto out;
2373 }
2374 reiserfs_write_unlock(sb);
2375 return dquot_quota_on(sb, type, format_id, path);
2376 out:
2377 reiserfs_write_unlock(sb);
2378 return err;
2379 }
2380
2381 /*
2382 * Read data from quotafile - avoid pagecache and such because we cannot afford
2383 * acquiring the locks... As quota files are never truncated and quota code
2384 * itself serializes the operations (and no one else should touch the files)
2385 * we don't have to be afraid of races
2386 */
2387 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2388 size_t len, loff_t off)
2389 {
2390 struct inode *inode = sb_dqopt(sb)->files[type];
2391 unsigned long blk = off >> sb->s_blocksize_bits;
2392 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2393 size_t toread;
2394 struct buffer_head tmp_bh, *bh;
2395 loff_t i_size = i_size_read(inode);
2396
2397 if (off > i_size)
2398 return 0;
2399 if (off + len > i_size)
2400 len = i_size - off;
2401 toread = len;
2402 while (toread > 0) {
2403 tocopy =
2404 sb->s_blocksize - offset <
2405 toread ? sb->s_blocksize - offset : toread;
2406 tmp_bh.b_state = 0;
2407 /*
2408 * Quota files are without tails so we can safely
2409 * use this function
2410 */
2411 reiserfs_write_lock(sb);
2412 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2413 reiserfs_write_unlock(sb);
2414 if (err)
2415 return err;
2416 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2417 memset(data, 0, tocopy);
2418 else {
2419 bh = sb_bread(sb, tmp_bh.b_blocknr);
2420 if (!bh)
2421 return -EIO;
2422 memcpy(data, bh->b_data + offset, tocopy);
2423 brelse(bh);
2424 }
2425 offset = 0;
2426 toread -= tocopy;
2427 data += tocopy;
2428 blk++;
2429 }
2430 return len;
2431 }
2432
2433 /*
2434 * Write to quotafile (we know the transaction is already started and has
2435 * enough credits)
2436 */
2437 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2438 const char *data, size_t len, loff_t off)
2439 {
2440 struct inode *inode = sb_dqopt(sb)->files[type];
2441 unsigned long blk = off >> sb->s_blocksize_bits;
2442 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2443 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2444 size_t towrite = len;
2445 struct buffer_head tmp_bh, *bh;
2446
2447 if (!current->journal_info) {
2448 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2449 (unsigned long long)off, (unsigned long long)len);
2450 return -EIO;
2451 }
2452 while (towrite > 0) {
2453 tocopy = sb->s_blocksize - offset < towrite ?
2454 sb->s_blocksize - offset : towrite;
2455 tmp_bh.b_state = 0;
2456 reiserfs_write_lock(sb);
2457 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2458 reiserfs_write_unlock(sb);
2459 if (err)
2460 goto out;
2461 if (offset || tocopy != sb->s_blocksize)
2462 bh = sb_bread(sb, tmp_bh.b_blocknr);
2463 else
2464 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2465 if (!bh) {
2466 err = -EIO;
2467 goto out;
2468 }
2469 lock_buffer(bh);
2470 memcpy(bh->b_data + offset, data, tocopy);
2471 flush_dcache_page(bh->b_page);
2472 set_buffer_uptodate(bh);
2473 unlock_buffer(bh);
2474 reiserfs_write_lock(sb);
2475 reiserfs_prepare_for_journal(sb, bh, 1);
2476 journal_mark_dirty(current->journal_info, bh);
2477 if (!journal_quota)
2478 reiserfs_add_ordered_list(inode, bh);
2479 reiserfs_write_unlock(sb);
2480 brelse(bh);
2481 offset = 0;
2482 towrite -= tocopy;
2483 data += tocopy;
2484 blk++;
2485 }
2486 out:
2487 if (len == towrite)
2488 return err;
2489 if (inode->i_size < off + len - towrite)
2490 i_size_write(inode, off + len - towrite);
2491 inode->i_version++;
2492 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2493 mark_inode_dirty(inode);
2494 return len - towrite;
2495 }
2496
2497 #endif
2498
2499 static struct dentry *get_super_block(struct file_system_type *fs_type,
2500 int flags, const char *dev_name,
2501 void *data)
2502 {
2503 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2504 }
2505
2506 static int __init init_reiserfs_fs(void)
2507 {
2508 int ret;
2509
2510 ret = init_inodecache();
2511 if (ret)
2512 return ret;
2513
2514 reiserfs_proc_info_global_init();
2515
2516 ret = register_filesystem(&reiserfs_fs_type);
2517 if (ret)
2518 goto out;
2519
2520 return 0;
2521 out:
2522 reiserfs_proc_info_global_done();
2523 destroy_inodecache();
2524
2525 return ret;
2526 }
2527
2528 static void __exit exit_reiserfs_fs(void)
2529 {
2530 reiserfs_proc_info_global_done();
2531 unregister_filesystem(&reiserfs_fs_type);
2532 destroy_inodecache();
2533 }
2534
2535 struct file_system_type reiserfs_fs_type = {
2536 .owner = THIS_MODULE,
2537 .name = "reiserfs",
2538 .mount = get_super_block,
2539 .kill_sb = reiserfs_kill_sb,
2540 .fs_flags = FS_REQUIRES_DEV,
2541 };
2542 MODULE_ALIAS_FS("reiserfs");
2543
2544 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2545 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2546 MODULE_LICENSE("GPL");
2547
2548 module_init(init_reiserfs_fs);
2549 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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