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Merge branch 'linux-4.12' of git://github.com/skeggsb/linux into drm-next
[mirror_ubuntu-jammy-kernel.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/backing-dev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/exportfs.h>
27 #include <linux/quotaops.h>
28 #include <linux/vfs.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/crc32.h>
32 #include <linux/seq_file.h>
33
34 struct file_system_type reiserfs_fs_type;
35
36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 {
42 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
43 strlen(reiserfs_3_5_magic_string));
44 }
45
46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 {
48 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
49 strlen(reiserfs_3_6_magic_string));
50 }
51
52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 {
54 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
55 strlen(reiserfs_jr_magic_string));
56 }
57
58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 {
60 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
61 is_reiserfs_jr(rs));
62 }
63
64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
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))
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 /*
93 * We need s_umount for protecting quota writeback. We have to use
94 * trylock as reiserfs_cancel_old_flush() may be waiting for this work
95 * to complete with s_umount held.
96 */
97 if (!down_read_trylock(&s->s_umount)) {
98 /* Requeue work if we are not cancelling it */
99 spin_lock(&sbi->old_work_lock);
100 if (sbi->work_queued == 1)
101 queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
102 spin_unlock(&sbi->old_work_lock);
103 return;
104 }
105 spin_lock(&sbi->old_work_lock);
106 /* Avoid clobbering the cancel state... */
107 if (sbi->work_queued == 1)
108 sbi->work_queued = 0;
109 spin_unlock(&sbi->old_work_lock);
110
111 reiserfs_sync_fs(s, 1);
112 up_read(&s->s_umount);
113 }
114
115 void reiserfs_schedule_old_flush(struct super_block *s)
116 {
117 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
118 unsigned long delay;
119
120 /*
121 * Avoid scheduling flush when sb is being shut down. It can race
122 * with journal shutdown and free still queued delayed work.
123 */
124 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
125 return;
126
127 spin_lock(&sbi->old_work_lock);
128 if (!sbi->work_queued) {
129 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
130 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
131 sbi->work_queued = 1;
132 }
133 spin_unlock(&sbi->old_work_lock);
134 }
135
136 void reiserfs_cancel_old_flush(struct super_block *s)
137 {
138 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
139
140 spin_lock(&sbi->old_work_lock);
141 /* Make sure no new flushes will be queued */
142 sbi->work_queued = 2;
143 spin_unlock(&sbi->old_work_lock);
144 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
145 }
146
147 static int reiserfs_freeze(struct super_block *s)
148 {
149 struct reiserfs_transaction_handle th;
150
151 reiserfs_cancel_old_flush(s);
152
153 reiserfs_write_lock(s);
154 if (!(s->s_flags & MS_RDONLY)) {
155 int err = journal_begin(&th, s, 1);
156 if (err) {
157 reiserfs_block_writes(&th);
158 } else {
159 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
160 1);
161 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
162 reiserfs_block_writes(&th);
163 journal_end_sync(&th);
164 }
165 }
166 reiserfs_write_unlock(s);
167 return 0;
168 }
169
170 static int reiserfs_unfreeze(struct super_block *s)
171 {
172 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
173
174 reiserfs_allow_writes(s);
175 spin_lock(&sbi->old_work_lock);
176 /* Allow old_work to run again */
177 sbi->work_queued = 0;
178 spin_unlock(&sbi->old_work_lock);
179 return 0;
180 }
181
182 extern const struct in_core_key MAX_IN_CORE_KEY;
183
184 /*
185 * this is used to delete "save link" when there are no items of a
186 * file it points to. It can either happen if unlink is completed but
187 * "save unlink" removal, or if file has both unlink and truncate
188 * pending and as unlink completes first (because key of "save link"
189 * protecting unlink is bigger that a key lf "save link" which
190 * protects truncate), so there left no items to make truncate
191 * completion on
192 */
193 static int remove_save_link_only(struct super_block *s,
194 struct reiserfs_key *key, int oid_free)
195 {
196 struct reiserfs_transaction_handle th;
197 int err;
198
199 /* we are going to do one balancing */
200 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
201 if (err)
202 return err;
203
204 reiserfs_delete_solid_item(&th, NULL, key);
205 if (oid_free)
206 /* removals are protected by direct items */
207 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
208
209 return journal_end(&th);
210 }
211
212 #ifdef CONFIG_QUOTA
213 static int reiserfs_quota_on_mount(struct super_block *, int);
214 #endif
215
216 /*
217 * Look for uncompleted unlinks and truncates and complete them
218 *
219 * Called with superblock write locked. If quotas are enabled, we have to
220 * release/retake lest we call dquot_quota_on_mount(), proceed to
221 * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
222 * cpu worklets to complete flush_async_commits() that in turn wait for the
223 * superblock write lock.
224 */
225 static int finish_unfinished(struct super_block *s)
226 {
227 INITIALIZE_PATH(path);
228 struct cpu_key max_cpu_key, obj_key;
229 struct reiserfs_key save_link_key, last_inode_key;
230 int retval = 0;
231 struct item_head *ih;
232 struct buffer_head *bh;
233 int item_pos;
234 char *item;
235 int done;
236 struct inode *inode;
237 int truncate;
238 #ifdef CONFIG_QUOTA
239 int i;
240 int ms_active_set;
241 int quota_enabled[REISERFS_MAXQUOTAS];
242 #endif
243
244 /* compose key to look for "save" links */
245 max_cpu_key.version = KEY_FORMAT_3_5;
246 max_cpu_key.on_disk_key.k_dir_id = ~0U;
247 max_cpu_key.on_disk_key.k_objectid = ~0U;
248 set_cpu_key_k_offset(&max_cpu_key, ~0U);
249 max_cpu_key.key_length = 3;
250
251 memset(&last_inode_key, 0, sizeof(last_inode_key));
252
253 #ifdef CONFIG_QUOTA
254 /* Needed for iput() to work correctly and not trash data */
255 if (s->s_flags & MS_ACTIVE) {
256 ms_active_set = 0;
257 } else {
258 ms_active_set = 1;
259 s->s_flags |= MS_ACTIVE;
260 }
261 /* Turn on quotas so that they are updated correctly */
262 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
263 quota_enabled[i] = 1;
264 if (REISERFS_SB(s)->s_qf_names[i]) {
265 int ret;
266
267 if (sb_has_quota_active(s, i)) {
268 quota_enabled[i] = 0;
269 continue;
270 }
271 reiserfs_write_unlock(s);
272 ret = reiserfs_quota_on_mount(s, i);
273 reiserfs_write_lock(s);
274 if (ret < 0)
275 reiserfs_warning(s, "reiserfs-2500",
276 "cannot turn on journaled "
277 "quota: error %d", ret);
278 }
279 }
280 #endif
281
282 done = 0;
283 REISERFS_SB(s)->s_is_unlinked_ok = 1;
284 while (!retval) {
285 int depth;
286 retval = search_item(s, &max_cpu_key, &path);
287 if (retval != ITEM_NOT_FOUND) {
288 reiserfs_error(s, "vs-2140",
289 "search_by_key returned %d", retval);
290 break;
291 }
292
293 bh = get_last_bh(&path);
294 item_pos = get_item_pos(&path);
295 if (item_pos != B_NR_ITEMS(bh)) {
296 reiserfs_warning(s, "vs-2060",
297 "wrong position found");
298 break;
299 }
300 item_pos--;
301 ih = item_head(bh, item_pos);
302
303 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
304 /* there are no "save" links anymore */
305 break;
306
307 save_link_key = ih->ih_key;
308 if (is_indirect_le_ih(ih))
309 truncate = 1;
310 else
311 truncate = 0;
312
313 /* reiserfs_iget needs k_dirid and k_objectid only */
314 item = ih_item_body(bh, ih);
315 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
316 obj_key.on_disk_key.k_objectid =
317 le32_to_cpu(ih->ih_key.k_objectid);
318 obj_key.on_disk_key.k_offset = 0;
319 obj_key.on_disk_key.k_type = 0;
320
321 pathrelse(&path);
322
323 inode = reiserfs_iget(s, &obj_key);
324 if (IS_ERR_OR_NULL(inode)) {
325 /*
326 * the unlink almost completed, it just did not
327 * manage to remove "save" link and release objectid
328 */
329 reiserfs_warning(s, "vs-2180", "iget failed for %K",
330 &obj_key);
331 retval = remove_save_link_only(s, &save_link_key, 1);
332 continue;
333 }
334
335 if (!truncate && inode->i_nlink) {
336 /* file is not unlinked */
337 reiserfs_warning(s, "vs-2185",
338 "file %K is not unlinked",
339 &obj_key);
340 retval = remove_save_link_only(s, &save_link_key, 0);
341 continue;
342 }
343 depth = reiserfs_write_unlock_nested(inode->i_sb);
344 dquot_initialize(inode);
345 reiserfs_write_lock_nested(inode->i_sb, depth);
346
347 if (truncate && S_ISDIR(inode->i_mode)) {
348 /*
349 * We got a truncate request for a dir which
350 * is impossible. The only imaginable way is to
351 * execute unfinished truncate request then boot
352 * into old kernel, remove the file and create dir
353 * with the same key.
354 */
355 reiserfs_warning(s, "green-2101",
356 "impossible truncate on a "
357 "directory %k. Please report",
358 INODE_PKEY(inode));
359 retval = remove_save_link_only(s, &save_link_key, 0);
360 truncate = 0;
361 iput(inode);
362 continue;
363 }
364
365 if (truncate) {
366 REISERFS_I(inode)->i_flags |=
367 i_link_saved_truncate_mask;
368 /*
369 * not completed truncate found. New size was
370 * committed together with "save" link
371 */
372 reiserfs_info(s, "Truncating %k to %lld ..",
373 INODE_PKEY(inode), inode->i_size);
374
375 /* don't update modification time */
376 reiserfs_truncate_file(inode, 0);
377
378 retval = remove_save_link(inode, truncate);
379 } else {
380 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
381 /* not completed unlink (rmdir) found */
382 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
383 if (memcmp(&last_inode_key, INODE_PKEY(inode),
384 sizeof(last_inode_key))){
385 last_inode_key = *INODE_PKEY(inode);
386 /* removal gets completed in iput */
387 retval = 0;
388 } else {
389 reiserfs_warning(s, "super-2189", "Dead loop "
390 "in finish_unfinished "
391 "detected, just remove "
392 "save link\n");
393 retval = remove_save_link_only(s,
394 &save_link_key, 0);
395 }
396 }
397
398 iput(inode);
399 printk("done\n");
400 done++;
401 }
402 REISERFS_SB(s)->s_is_unlinked_ok = 0;
403
404 #ifdef CONFIG_QUOTA
405 /* Turn quotas off */
406 reiserfs_write_unlock(s);
407 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
408 if (sb_dqopt(s)->files[i] && quota_enabled[i])
409 dquot_quota_off(s, i);
410 }
411 reiserfs_write_lock(s);
412 if (ms_active_set)
413 /* Restore the flag back */
414 s->s_flags &= ~MS_ACTIVE;
415 #endif
416 pathrelse(&path);
417 if (done)
418 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
419 "Completed\n", done);
420 return retval;
421 }
422
423 /*
424 * to protect file being unlinked from getting lost we "safe" link files
425 * being unlinked. This link will be deleted in the same transaction with last
426 * item of file. mounting the filesystem we scan all these links and remove
427 * files which almost got lost
428 */
429 void add_save_link(struct reiserfs_transaction_handle *th,
430 struct inode *inode, int truncate)
431 {
432 INITIALIZE_PATH(path);
433 int retval;
434 struct cpu_key key;
435 struct item_head ih;
436 __le32 link;
437
438 BUG_ON(!th->t_trans_id);
439
440 /* file can only get one "save link" of each kind */
441 RFALSE(truncate &&
442 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
443 "saved link already exists for truncated inode %lx",
444 (long)inode->i_ino);
445 RFALSE(!truncate &&
446 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
447 "saved link already exists for unlinked inode %lx",
448 (long)inode->i_ino);
449
450 /* setup key of "save" link */
451 key.version = KEY_FORMAT_3_5;
452 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
453 key.on_disk_key.k_objectid = inode->i_ino;
454 if (!truncate) {
455 /* unlink, rmdir, rename */
456 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
457 set_cpu_key_k_type(&key, TYPE_DIRECT);
458
459 /* item head of "safe" link */
460 make_le_item_head(&ih, &key, key.version,
461 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
462 4 /*length */ , 0xffff /*free space */ );
463 } else {
464 /* truncate */
465 if (S_ISDIR(inode->i_mode))
466 reiserfs_warning(inode->i_sb, "green-2102",
467 "Adding a truncate savelink for "
468 "a directory %k! Please report",
469 INODE_PKEY(inode));
470 set_cpu_key_k_offset(&key, 1);
471 set_cpu_key_k_type(&key, TYPE_INDIRECT);
472
473 /* item head of "safe" link */
474 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
475 4 /*length */ , 0 /*free space */ );
476 }
477 key.key_length = 3;
478
479 /* look for its place in the tree */
480 retval = search_item(inode->i_sb, &key, &path);
481 if (retval != ITEM_NOT_FOUND) {
482 if (retval != -ENOSPC)
483 reiserfs_error(inode->i_sb, "vs-2100",
484 "search_by_key (%K) returned %d", &key,
485 retval);
486 pathrelse(&path);
487 return;
488 }
489
490 /* body of "save" link */
491 link = INODE_PKEY(inode)->k_dir_id;
492
493 /* put "save" link into tree, don't charge quota to anyone */
494 retval =
495 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
496 if (retval) {
497 if (retval != -ENOSPC)
498 reiserfs_error(inode->i_sb, "vs-2120",
499 "insert_item returned %d", retval);
500 } else {
501 if (truncate)
502 REISERFS_I(inode)->i_flags |=
503 i_link_saved_truncate_mask;
504 else
505 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
506 }
507 }
508
509 /* this opens transaction unlike add_save_link */
510 int remove_save_link(struct inode *inode, int truncate)
511 {
512 struct reiserfs_transaction_handle th;
513 struct reiserfs_key key;
514 int err;
515
516 /* we are going to do one balancing only */
517 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
518 if (err)
519 return err;
520
521 /* setup key of "save" link */
522 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
523 key.k_objectid = INODE_PKEY(inode)->k_objectid;
524 if (!truncate) {
525 /* unlink, rmdir, rename */
526 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
527 1 + inode->i_sb->s_blocksize);
528 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
529 } else {
530 /* truncate */
531 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
532 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
533 }
534
535 if ((truncate &&
536 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
537 (!truncate &&
538 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
539 /* don't take quota bytes from anywhere */
540 reiserfs_delete_solid_item(&th, NULL, &key);
541 if (!truncate) {
542 reiserfs_release_objectid(&th, inode->i_ino);
543 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
544 } else
545 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
546
547 return journal_end(&th);
548 }
549
550 static void reiserfs_kill_sb(struct super_block *s)
551 {
552 if (REISERFS_SB(s)) {
553 reiserfs_proc_info_done(s);
554 /*
555 * Force any pending inode evictions to occur now. Any
556 * inodes to be removed that have extended attributes
557 * associated with them need to clean them up before
558 * we can release the extended attribute root dentries.
559 * shrink_dcache_for_umount will BUG if we don't release
560 * those before it's called so ->put_super is too late.
561 */
562 shrink_dcache_sb(s);
563
564 dput(REISERFS_SB(s)->xattr_root);
565 REISERFS_SB(s)->xattr_root = NULL;
566 dput(REISERFS_SB(s)->priv_root);
567 REISERFS_SB(s)->priv_root = NULL;
568 }
569
570 kill_block_super(s);
571 }
572
573 #ifdef CONFIG_QUOTA
574 static int reiserfs_quota_off(struct super_block *sb, int type);
575
576 static void reiserfs_quota_off_umount(struct super_block *s)
577 {
578 int type;
579
580 for (type = 0; type < REISERFS_MAXQUOTAS; type++)
581 reiserfs_quota_off(s, type);
582 }
583 #else
584 static inline void reiserfs_quota_off_umount(struct super_block *s)
585 {
586 }
587 #endif
588
589 static void reiserfs_put_super(struct super_block *s)
590 {
591 struct reiserfs_transaction_handle th;
592 th.t_trans_id = 0;
593
594 reiserfs_quota_off_umount(s);
595
596 reiserfs_write_lock(s);
597
598 /*
599 * change file system state to current state if it was mounted
600 * with read-write permissions
601 */
602 if (!(s->s_flags & MS_RDONLY)) {
603 if (!journal_begin(&th, s, 10)) {
604 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
605 1);
606 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
607 REISERFS_SB(s)->s_mount_state);
608 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
609 }
610 }
611
612 /*
613 * note, journal_release checks for readonly mount, and can
614 * decide not to do a journal_end
615 */
616 journal_release(&th, s);
617
618 reiserfs_free_bitmap_cache(s);
619
620 brelse(SB_BUFFER_WITH_SB(s));
621
622 print_statistics(s);
623
624 if (REISERFS_SB(s)->reserved_blocks != 0) {
625 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
626 REISERFS_SB(s)->reserved_blocks);
627 }
628
629 reiserfs_write_unlock(s);
630 mutex_destroy(&REISERFS_SB(s)->lock);
631 destroy_workqueue(REISERFS_SB(s)->commit_wq);
632 kfree(s->s_fs_info);
633 s->s_fs_info = NULL;
634 }
635
636 static struct kmem_cache *reiserfs_inode_cachep;
637
638 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
639 {
640 struct reiserfs_inode_info *ei;
641 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
642 if (!ei)
643 return NULL;
644 atomic_set(&ei->openers, 0);
645 mutex_init(&ei->tailpack);
646 #ifdef CONFIG_QUOTA
647 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
648 #endif
649
650 return &ei->vfs_inode;
651 }
652
653 static void reiserfs_i_callback(struct rcu_head *head)
654 {
655 struct inode *inode = container_of(head, struct inode, i_rcu);
656 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657 }
658
659 static void reiserfs_destroy_inode(struct inode *inode)
660 {
661 call_rcu(&inode->i_rcu, reiserfs_i_callback);
662 }
663
664 static void init_once(void *foo)
665 {
666 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
667
668 INIT_LIST_HEAD(&ei->i_prealloc_list);
669 inode_init_once(&ei->vfs_inode);
670 }
671
672 static int __init init_inodecache(void)
673 {
674 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
675 sizeof(struct
676 reiserfs_inode_info),
677 0, (SLAB_RECLAIM_ACCOUNT|
678 SLAB_MEM_SPREAD|
679 SLAB_ACCOUNT),
680 init_once);
681 if (reiserfs_inode_cachep == NULL)
682 return -ENOMEM;
683 return 0;
684 }
685
686 static void destroy_inodecache(void)
687 {
688 /*
689 * Make sure all delayed rcu free inodes are flushed before we
690 * destroy cache.
691 */
692 rcu_barrier();
693 kmem_cache_destroy(reiserfs_inode_cachep);
694 }
695
696 /* we don't mark inodes dirty, we just log them */
697 static void reiserfs_dirty_inode(struct inode *inode, int flags)
698 {
699 struct reiserfs_transaction_handle th;
700
701 int err = 0;
702
703 if (inode->i_sb->s_flags & MS_RDONLY) {
704 reiserfs_warning(inode->i_sb, "clm-6006",
705 "writing inode %lu on readonly FS",
706 inode->i_ino);
707 return;
708 }
709 reiserfs_write_lock(inode->i_sb);
710
711 /*
712 * this is really only used for atime updates, so they don't have
713 * to be included in O_SYNC or fsync
714 */
715 err = journal_begin(&th, inode->i_sb, 1);
716 if (err)
717 goto out;
718
719 reiserfs_update_sd(&th, inode);
720 journal_end(&th);
721
722 out:
723 reiserfs_write_unlock(inode->i_sb);
724 }
725
726 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
727 {
728 struct super_block *s = root->d_sb;
729 struct reiserfs_journal *journal = SB_JOURNAL(s);
730 long opts = REISERFS_SB(s)->s_mount_opt;
731
732 if (opts & (1 << REISERFS_LARGETAIL))
733 seq_puts(seq, ",tails=on");
734 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
735 seq_puts(seq, ",notail");
736 /* tails=small is default so we don't show it */
737
738 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
739 seq_puts(seq, ",barrier=none");
740 /* barrier=flush is default so we don't show it */
741
742 if (opts & (1 << REISERFS_ERROR_CONTINUE))
743 seq_puts(seq, ",errors=continue");
744 else if (opts & (1 << REISERFS_ERROR_PANIC))
745 seq_puts(seq, ",errors=panic");
746 /* errors=ro is default so we don't show it */
747
748 if (opts & (1 << REISERFS_DATA_LOG))
749 seq_puts(seq, ",data=journal");
750 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
751 seq_puts(seq, ",data=writeback");
752 /* data=ordered is default so we don't show it */
753
754 if (opts & (1 << REISERFS_ATTRS))
755 seq_puts(seq, ",attrs");
756
757 if (opts & (1 << REISERFS_XATTRS_USER))
758 seq_puts(seq, ",user_xattr");
759
760 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
761 seq_puts(seq, ",expose_privroot");
762
763 if (opts & (1 << REISERFS_POSIXACL))
764 seq_puts(seq, ",acl");
765
766 if (REISERFS_SB(s)->s_jdev)
767 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
768
769 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
770 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
771
772 #ifdef CONFIG_QUOTA
773 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
774 seq_show_option(seq, "usrjquota",
775 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
776 else if (opts & (1 << REISERFS_USRQUOTA))
777 seq_puts(seq, ",usrquota");
778 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
779 seq_show_option(seq, "grpjquota",
780 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
781 else if (opts & (1 << REISERFS_GRPQUOTA))
782 seq_puts(seq, ",grpquota");
783 if (REISERFS_SB(s)->s_jquota_fmt) {
784 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
785 seq_puts(seq, ",jqfmt=vfsold");
786 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
787 seq_puts(seq, ",jqfmt=vfsv0");
788 }
789 #endif
790
791 /* Block allocator options */
792 if (opts & (1 << REISERFS_NO_BORDER))
793 seq_puts(seq, ",block-allocator=noborder");
794 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
795 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
796 if (opts & (1 << REISERFS_HASHED_RELOCATION))
797 seq_puts(seq, ",block-allocator=hashed_relocation");
798 if (opts & (1 << REISERFS_TEST4))
799 seq_puts(seq, ",block-allocator=test4");
800 show_alloc_options(seq, s);
801 return 0;
802 }
803
804 #ifdef CONFIG_QUOTA
805 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
806 size_t, loff_t);
807 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
808 loff_t);
809
810 static struct dquot **reiserfs_get_dquots(struct inode *inode)
811 {
812 return REISERFS_I(inode)->i_dquot;
813 }
814 #endif
815
816 static const struct super_operations reiserfs_sops = {
817 .alloc_inode = reiserfs_alloc_inode,
818 .destroy_inode = reiserfs_destroy_inode,
819 .write_inode = reiserfs_write_inode,
820 .dirty_inode = reiserfs_dirty_inode,
821 .evict_inode = reiserfs_evict_inode,
822 .put_super = reiserfs_put_super,
823 .sync_fs = reiserfs_sync_fs,
824 .freeze_fs = reiserfs_freeze,
825 .unfreeze_fs = reiserfs_unfreeze,
826 .statfs = reiserfs_statfs,
827 .remount_fs = reiserfs_remount,
828 .show_options = reiserfs_show_options,
829 #ifdef CONFIG_QUOTA
830 .quota_read = reiserfs_quota_read,
831 .quota_write = reiserfs_quota_write,
832 .get_dquots = reiserfs_get_dquots,
833 #endif
834 };
835
836 #ifdef CONFIG_QUOTA
837 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
838
839 static int reiserfs_write_dquot(struct dquot *);
840 static int reiserfs_acquire_dquot(struct dquot *);
841 static int reiserfs_release_dquot(struct dquot *);
842 static int reiserfs_mark_dquot_dirty(struct dquot *);
843 static int reiserfs_write_info(struct super_block *, int);
844 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
845
846 static const struct dquot_operations reiserfs_quota_operations = {
847 .write_dquot = reiserfs_write_dquot,
848 .acquire_dquot = reiserfs_acquire_dquot,
849 .release_dquot = reiserfs_release_dquot,
850 .mark_dirty = reiserfs_mark_dquot_dirty,
851 .write_info = reiserfs_write_info,
852 .alloc_dquot = dquot_alloc,
853 .destroy_dquot = dquot_destroy,
854 .get_next_id = dquot_get_next_id,
855 };
856
857 static const struct quotactl_ops reiserfs_qctl_operations = {
858 .quota_on = reiserfs_quota_on,
859 .quota_off = reiserfs_quota_off,
860 .quota_sync = dquot_quota_sync,
861 .get_state = dquot_get_state,
862 .set_info = dquot_set_dqinfo,
863 .get_dqblk = dquot_get_dqblk,
864 .set_dqblk = dquot_set_dqblk,
865 };
866 #endif
867
868 static const struct export_operations reiserfs_export_ops = {
869 .encode_fh = reiserfs_encode_fh,
870 .fh_to_dentry = reiserfs_fh_to_dentry,
871 .fh_to_parent = reiserfs_fh_to_parent,
872 .get_parent = reiserfs_get_parent,
873 };
874
875 /*
876 * this struct is used in reiserfs_getopt () for containing the value for
877 * those mount options that have values rather than being toggles.
878 */
879 typedef struct {
880 char *value;
881 /*
882 * bitmask which is to set on mount_options bitmask
883 * when this value is found, 0 is no bits are to be changed.
884 */
885 int setmask;
886 /*
887 * bitmask which is to clear on mount_options bitmask
888 * when this value is found, 0 is no bits are to be changed.
889 * This is applied BEFORE setmask
890 */
891 int clrmask;
892 } arg_desc_t;
893
894 /* Set this bit in arg_required to allow empty arguments */
895 #define REISERFS_OPT_ALLOWEMPTY 31
896
897 /*
898 * this struct is used in reiserfs_getopt() for describing the
899 * set of reiserfs mount options
900 */
901 typedef struct {
902 char *option_name;
903
904 /* 0 if argument is not required, not 0 otherwise */
905 int arg_required;
906
907 /* list of values accepted by an option */
908 const arg_desc_t *values;
909
910 /*
911 * bitmask which is to set on mount_options bitmask
912 * when this value is found, 0 is no bits are to be changed.
913 */
914 int setmask;
915
916 /*
917 * bitmask which is to clear on mount_options bitmask
918 * when this value is found, 0 is no bits are to be changed.
919 * This is applied BEFORE setmask
920 */
921 int clrmask;
922 } opt_desc_t;
923
924 /* possible values for -o data= */
925 static const arg_desc_t logging_mode[] = {
926 {"ordered", 1 << REISERFS_DATA_ORDERED,
927 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
928 {"journal", 1 << REISERFS_DATA_LOG,
929 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
930 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
931 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
932 {.value = NULL}
933 };
934
935 /* possible values for -o barrier= */
936 static const arg_desc_t barrier_mode[] = {
937 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
938 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
939 {.value = NULL}
940 };
941
942 /*
943 * possible values for "-o block-allocator=" and bits which are to be set in
944 * s_mount_opt of reiserfs specific part of in-core super block
945 */
946 static const arg_desc_t balloc[] = {
947 {"noborder", 1 << REISERFS_NO_BORDER, 0},
948 {"border", 0, 1 << REISERFS_NO_BORDER},
949 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
950 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
951 {"test4", 1 << REISERFS_TEST4, 0},
952 {"notest4", 0, 1 << REISERFS_TEST4},
953 {NULL, 0, 0}
954 };
955
956 static const arg_desc_t tails[] = {
957 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
958 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
959 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
960 {NULL, 0, 0}
961 };
962
963 static const arg_desc_t error_actions[] = {
964 {"panic", 1 << REISERFS_ERROR_PANIC,
965 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
966 {"ro-remount", 1 << REISERFS_ERROR_RO,
967 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
968 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
969 {"continue", 1 << REISERFS_ERROR_CONTINUE,
970 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
971 #endif
972 {NULL, 0, 0},
973 };
974
975 /*
976 * proceed only one option from a list *cur - string containing of mount
977 * options
978 * opts - array of options which are accepted
979 * opt_arg - if option is found and requires an argument and if it is specifed
980 * in the input - pointer to the argument is stored here
981 * bit_flags - if option requires to set a certain bit - it is set here
982 * return -1 if unknown option is found, opt->arg_required otherwise
983 */
984 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
985 char **opt_arg, unsigned long *bit_flags)
986 {
987 char *p;
988 /*
989 * foo=bar,
990 * ^ ^ ^
991 * | | +-- option_end
992 * | +-- arg_start
993 * +-- option_start
994 */
995 const opt_desc_t *opt;
996 const arg_desc_t *arg;
997
998 p = *cur;
999
1000 /* assume argument cannot contain commas */
1001 *cur = strchr(p, ',');
1002 if (*cur) {
1003 *(*cur) = '\0';
1004 (*cur)++;
1005 }
1006
1007 if (!strncmp(p, "alloc=", 6)) {
1008 /*
1009 * Ugly special case, probably we should redo options
1010 * parser so that it can understand several arguments for
1011 * some options, also so that it can fill several bitfields
1012 * with option values.
1013 */
1014 if (reiserfs_parse_alloc_options(s, p + 6)) {
1015 return -1;
1016 } else {
1017 return 0;
1018 }
1019 }
1020
1021 /* for every option in the list */
1022 for (opt = opts; opt->option_name; opt++) {
1023 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1024 if (bit_flags) {
1025 if (opt->clrmask ==
1026 (1 << REISERFS_UNSUPPORTED_OPT))
1027 reiserfs_warning(s, "super-6500",
1028 "%s not supported.\n",
1029 p);
1030 else
1031 *bit_flags &= ~opt->clrmask;
1032 if (opt->setmask ==
1033 (1 << REISERFS_UNSUPPORTED_OPT))
1034 reiserfs_warning(s, "super-6501",
1035 "%s not supported.\n",
1036 p);
1037 else
1038 *bit_flags |= opt->setmask;
1039 }
1040 break;
1041 }
1042 }
1043 if (!opt->option_name) {
1044 reiserfs_warning(s, "super-6502",
1045 "unknown mount option \"%s\"", p);
1046 return -1;
1047 }
1048
1049 p += strlen(opt->option_name);
1050 switch (*p) {
1051 case '=':
1052 if (!opt->arg_required) {
1053 reiserfs_warning(s, "super-6503",
1054 "the option \"%s\" does not "
1055 "require an argument\n",
1056 opt->option_name);
1057 return -1;
1058 }
1059 break;
1060
1061 case 0:
1062 if (opt->arg_required) {
1063 reiserfs_warning(s, "super-6504",
1064 "the option \"%s\" requires an "
1065 "argument\n", opt->option_name);
1066 return -1;
1067 }
1068 break;
1069 default:
1070 reiserfs_warning(s, "super-6505",
1071 "head of option \"%s\" is only correct\n",
1072 opt->option_name);
1073 return -1;
1074 }
1075
1076 /*
1077 * move to the argument, or to next option if argument is not
1078 * required
1079 */
1080 p++;
1081
1082 if (opt->arg_required
1083 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1084 && !strlen(p)) {
1085 /* this catches "option=," if not allowed */
1086 reiserfs_warning(s, "super-6506",
1087 "empty argument for \"%s\"\n",
1088 opt->option_name);
1089 return -1;
1090 }
1091
1092 if (!opt->values) {
1093 /* *=NULLopt_arg contains pointer to argument */
1094 *opt_arg = p;
1095 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1096 }
1097
1098 /* values possible for this option are listed in opt->values */
1099 for (arg = opt->values; arg->value; arg++) {
1100 if (!strcmp(p, arg->value)) {
1101 if (bit_flags) {
1102 *bit_flags &= ~arg->clrmask;
1103 *bit_flags |= arg->setmask;
1104 }
1105 return opt->arg_required;
1106 }
1107 }
1108
1109 reiserfs_warning(s, "super-6506",
1110 "bad value \"%s\" for option \"%s\"\n", p,
1111 opt->option_name);
1112 return -1;
1113 }
1114
1115 /* returns 0 if something is wrong in option string, 1 - otherwise */
1116 static int reiserfs_parse_options(struct super_block *s,
1117
1118 /* string given via mount's -o */
1119 char *options,
1120
1121 /*
1122 * after the parsing phase, contains the
1123 * collection of bitflags defining what
1124 * mount options were selected.
1125 */
1126 unsigned long *mount_options,
1127
1128 /* strtol-ed from NNN of resize=NNN */
1129 unsigned long *blocks,
1130 char **jdev_name,
1131 unsigned int *commit_max_age,
1132 char **qf_names,
1133 unsigned int *qfmt)
1134 {
1135 int c;
1136 char *arg = NULL;
1137 char *pos;
1138 opt_desc_t opts[] = {
1139 /*
1140 * Compatibility stuff, so that -o notail for old
1141 * setups still work
1142 */
1143 {"tails",.arg_required = 't',.values = tails},
1144 {"notail",.clrmask =
1145 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1146 {"conv",.setmask = 1 << REISERFS_CONVERT},
1147 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1148 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1149 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1150 #ifdef CONFIG_REISERFS_FS_XATTR
1151 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1152 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1153 #else
1154 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1155 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156 #endif
1157 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1158 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1159 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1160 #else
1161 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1162 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1163 #endif
1164 {.option_name = "nolog"},
1165 {"replayonly",.setmask = 1 << REPLAYONLY},
1166 {"block-allocator",.arg_required = 'a',.values = balloc},
1167 {"data",.arg_required = 'd',.values = logging_mode},
1168 {"barrier",.arg_required = 'b',.values = barrier_mode},
1169 {"resize",.arg_required = 'r',.values = NULL},
1170 {"jdev",.arg_required = 'j',.values = NULL},
1171 {"nolargeio",.arg_required = 'w',.values = NULL},
1172 {"commit",.arg_required = 'c',.values = NULL},
1173 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1174 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1175 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1176 {"errors",.arg_required = 'e',.values = error_actions},
1177 {"usrjquota",.arg_required =
1178 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1179 {"grpjquota",.arg_required =
1180 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1181 {"jqfmt",.arg_required = 'f',.values = NULL},
1182 {.option_name = NULL}
1183 };
1184
1185 *blocks = 0;
1186 if (!options || !*options)
1187 /*
1188 * use default configuration: create tails, journaling on, no
1189 * conversion to newest format
1190 */
1191 return 1;
1192
1193 for (pos = options; pos;) {
1194 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1195 if (c == -1)
1196 /* wrong option is given */
1197 return 0;
1198
1199 if (c == 'r') {
1200 char *p;
1201
1202 p = NULL;
1203 /* "resize=NNN" or "resize=auto" */
1204
1205 if (!strcmp(arg, "auto")) {
1206 /* From JFS code, to auto-get the size. */
1207 *blocks =
1208 i_size_read(s->s_bdev->bd_inode) >> s->
1209 s_blocksize_bits;
1210 } else {
1211 *blocks = simple_strtoul(arg, &p, 0);
1212 if (*p != '\0') {
1213 /* NNN does not look like a number */
1214 reiserfs_warning(s, "super-6507",
1215 "bad value %s for "
1216 "-oresize\n", arg);
1217 return 0;
1218 }
1219 }
1220 }
1221
1222 if (c == 'c') {
1223 char *p = NULL;
1224 unsigned long val = simple_strtoul(arg, &p, 0);
1225 /* commit=NNN (time in seconds) */
1226 if (*p != '\0' || val >= (unsigned int)-1) {
1227 reiserfs_warning(s, "super-6508",
1228 "bad value %s for -ocommit\n",
1229 arg);
1230 return 0;
1231 }
1232 *commit_max_age = (unsigned int)val;
1233 }
1234
1235 if (c == 'w') {
1236 reiserfs_warning(s, "super-6509", "nolargeio option "
1237 "is no longer supported");
1238 return 0;
1239 }
1240
1241 if (c == 'j') {
1242 if (arg && *arg && jdev_name) {
1243 /* Hm, already assigned? */
1244 if (*jdev_name) {
1245 reiserfs_warning(s, "super-6510",
1246 "journal device was "
1247 "already specified to "
1248 "be %s", *jdev_name);
1249 return 0;
1250 }
1251 *jdev_name = arg;
1252 }
1253 }
1254 #ifdef CONFIG_QUOTA
1255 if (c == 'u' || c == 'g') {
1256 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1257
1258 if (sb_any_quota_loaded(s) &&
1259 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1260 reiserfs_warning(s, "super-6511",
1261 "cannot change journaled "
1262 "quota options when quota "
1263 "turned on.");
1264 return 0;
1265 }
1266 if (*arg) { /* Some filename specified? */
1267 if (REISERFS_SB(s)->s_qf_names[qtype]
1268 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1269 arg)) {
1270 reiserfs_warning(s, "super-6512",
1271 "%s quota file "
1272 "already specified.",
1273 QTYPE2NAME(qtype));
1274 return 0;
1275 }
1276 if (strchr(arg, '/')) {
1277 reiserfs_warning(s, "super-6513",
1278 "quotafile must be "
1279 "on filesystem root.");
1280 return 0;
1281 }
1282 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1283 if (!qf_names[qtype]) {
1284 reiserfs_warning(s, "reiserfs-2502",
1285 "not enough memory "
1286 "for storing "
1287 "quotafile name.");
1288 return 0;
1289 }
1290 if (qtype == USRQUOTA)
1291 *mount_options |= 1 << REISERFS_USRQUOTA;
1292 else
1293 *mount_options |= 1 << REISERFS_GRPQUOTA;
1294 } else {
1295 if (qf_names[qtype] !=
1296 REISERFS_SB(s)->s_qf_names[qtype])
1297 kfree(qf_names[qtype]);
1298 qf_names[qtype] = NULL;
1299 if (qtype == USRQUOTA)
1300 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1301 else
1302 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1303 }
1304 }
1305 if (c == 'f') {
1306 if (!strcmp(arg, "vfsold"))
1307 *qfmt = QFMT_VFS_OLD;
1308 else if (!strcmp(arg, "vfsv0"))
1309 *qfmt = QFMT_VFS_V0;
1310 else {
1311 reiserfs_warning(s, "super-6514",
1312 "unknown quota format "
1313 "specified.");
1314 return 0;
1315 }
1316 if (sb_any_quota_loaded(s) &&
1317 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1318 reiserfs_warning(s, "super-6515",
1319 "cannot change journaled "
1320 "quota options when quota "
1321 "turned on.");
1322 return 0;
1323 }
1324 }
1325 #else
1326 if (c == 'u' || c == 'g' || c == 'f') {
1327 reiserfs_warning(s, "reiserfs-2503", "journaled "
1328 "quota options not supported.");
1329 return 0;
1330 }
1331 #endif
1332 }
1333
1334 #ifdef CONFIG_QUOTA
1335 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1336 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1337 reiserfs_warning(s, "super-6515",
1338 "journaled quota format not specified.");
1339 return 0;
1340 }
1341 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1342 sb_has_quota_loaded(s, USRQUOTA)) ||
1343 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1344 sb_has_quota_loaded(s, GRPQUOTA))) {
1345 reiserfs_warning(s, "super-6516", "quota options must "
1346 "be present when quota is turned on.");
1347 return 0;
1348 }
1349 #endif
1350
1351 return 1;
1352 }
1353
1354 static void switch_data_mode(struct super_block *s, unsigned long mode)
1355 {
1356 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1357 (1 << REISERFS_DATA_ORDERED) |
1358 (1 << REISERFS_DATA_WRITEBACK));
1359 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1360 }
1361
1362 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1363 {
1364 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1365 if (!reiserfs_data_log(s)) {
1366 switch_data_mode(s, REISERFS_DATA_LOG);
1367 reiserfs_info(s, "switching to journaled data mode\n");
1368 }
1369 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1370 if (!reiserfs_data_ordered(s)) {
1371 switch_data_mode(s, REISERFS_DATA_ORDERED);
1372 reiserfs_info(s, "switching to ordered data mode\n");
1373 }
1374 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1375 if (!reiserfs_data_writeback(s)) {
1376 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1377 reiserfs_info(s, "switching to writeback data mode\n");
1378 }
1379 }
1380 }
1381
1382 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1383 {
1384 int flush = (1 << REISERFS_BARRIER_FLUSH);
1385 int none = (1 << REISERFS_BARRIER_NONE);
1386 int all_barrier = flush | none;
1387
1388 if (bits & all_barrier) {
1389 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1390 if (bits & flush) {
1391 REISERFS_SB(s)->s_mount_opt |= flush;
1392 printk("reiserfs: enabling write barrier flush mode\n");
1393 } else if (bits & none) {
1394 REISERFS_SB(s)->s_mount_opt |= none;
1395 printk("reiserfs: write barriers turned off\n");
1396 }
1397 }
1398 }
1399
1400 static void handle_attrs(struct super_block *s)
1401 {
1402 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1403
1404 if (reiserfs_attrs(s)) {
1405 if (old_format_only(s)) {
1406 reiserfs_warning(s, "super-6517", "cannot support "
1407 "attributes on 3.5.x disk format");
1408 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1409 return;
1410 }
1411 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1412 reiserfs_warning(s, "super-6518", "cannot support "
1413 "attributes until flag is set in "
1414 "super-block");
1415 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1416 }
1417 }
1418 }
1419
1420 #ifdef CONFIG_QUOTA
1421 static void handle_quota_files(struct super_block *s, char **qf_names,
1422 unsigned int *qfmt)
1423 {
1424 int i;
1425
1426 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1427 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1428 kfree(REISERFS_SB(s)->s_qf_names[i]);
1429 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1430 }
1431 if (*qfmt)
1432 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1433 }
1434 #endif
1435
1436 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1437 {
1438 struct reiserfs_super_block *rs;
1439 struct reiserfs_transaction_handle th;
1440 unsigned long blocks;
1441 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1442 unsigned long safe_mask = 0;
1443 unsigned int commit_max_age = (unsigned int)-1;
1444 struct reiserfs_journal *journal = SB_JOURNAL(s);
1445 char *new_opts;
1446 int err;
1447 char *qf_names[REISERFS_MAXQUOTAS];
1448 unsigned int qfmt = 0;
1449 #ifdef CONFIG_QUOTA
1450 int i;
1451 #endif
1452
1453 new_opts = kstrdup(arg, GFP_KERNEL);
1454 if (arg && !new_opts)
1455 return -ENOMEM;
1456
1457 sync_filesystem(s);
1458 reiserfs_write_lock(s);
1459
1460 #ifdef CONFIG_QUOTA
1461 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1462 #endif
1463
1464 rs = SB_DISK_SUPER_BLOCK(s);
1465
1466 if (!reiserfs_parse_options
1467 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1468 qf_names, &qfmt)) {
1469 #ifdef CONFIG_QUOTA
1470 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1471 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1472 kfree(qf_names[i]);
1473 #endif
1474 err = -EINVAL;
1475 goto out_err_unlock;
1476 }
1477 #ifdef CONFIG_QUOTA
1478 handle_quota_files(s, qf_names, &qfmt);
1479 #endif
1480
1481 handle_attrs(s);
1482
1483 /* Add options that are safe here */
1484 safe_mask |= 1 << REISERFS_SMALLTAIL;
1485 safe_mask |= 1 << REISERFS_LARGETAIL;
1486 safe_mask |= 1 << REISERFS_NO_BORDER;
1487 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1488 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1489 safe_mask |= 1 << REISERFS_TEST4;
1490 safe_mask |= 1 << REISERFS_ATTRS;
1491 safe_mask |= 1 << REISERFS_XATTRS_USER;
1492 safe_mask |= 1 << REISERFS_POSIXACL;
1493 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1494 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1495 safe_mask |= 1 << REISERFS_ERROR_RO;
1496 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1497 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1498 safe_mask |= 1 << REISERFS_USRQUOTA;
1499 safe_mask |= 1 << REISERFS_GRPQUOTA;
1500
1501 /*
1502 * Update the bitmask, taking care to keep
1503 * the bits we're not allowed to change here
1504 */
1505 REISERFS_SB(s)->s_mount_opt =
1506 (REISERFS_SB(s)->
1507 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1508
1509 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1510 journal->j_max_commit_age = commit_max_age;
1511 journal->j_max_trans_age = commit_max_age;
1512 } else if (commit_max_age == 0) {
1513 /* 0 means restore defaults. */
1514 journal->j_max_commit_age = journal->j_default_max_commit_age;
1515 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1516 }
1517
1518 if (blocks) {
1519 err = reiserfs_resize(s, blocks);
1520 if (err != 0)
1521 goto out_err_unlock;
1522 }
1523
1524 if (*mount_flags & MS_RDONLY) {
1525 reiserfs_write_unlock(s);
1526 reiserfs_xattr_init(s, *mount_flags);
1527 /* remount read-only */
1528 if (s->s_flags & MS_RDONLY)
1529 /* it is read-only already */
1530 goto out_ok_unlocked;
1531
1532 err = dquot_suspend(s, -1);
1533 if (err < 0)
1534 goto out_err;
1535
1536 /* try to remount file system with read-only permissions */
1537 if (sb_umount_state(rs) == REISERFS_VALID_FS
1538 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1539 goto out_ok_unlocked;
1540 }
1541
1542 reiserfs_write_lock(s);
1543
1544 err = journal_begin(&th, s, 10);
1545 if (err)
1546 goto out_err_unlock;
1547
1548 /* Mounting a rw partition read-only. */
1549 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1550 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1551 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1552 } else {
1553 /* remount read-write */
1554 if (!(s->s_flags & MS_RDONLY)) {
1555 reiserfs_write_unlock(s);
1556 reiserfs_xattr_init(s, *mount_flags);
1557 goto out_ok_unlocked; /* We are read-write already */
1558 }
1559
1560 if (reiserfs_is_journal_aborted(journal)) {
1561 err = journal->j_errno;
1562 goto out_err_unlock;
1563 }
1564
1565 handle_data_mode(s, mount_options);
1566 handle_barrier_mode(s, mount_options);
1567 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1568
1569 /* now it is safe to call journal_begin */
1570 s->s_flags &= ~MS_RDONLY;
1571 err = journal_begin(&th, s, 10);
1572 if (err)
1573 goto out_err_unlock;
1574
1575 /* Mount a partition which is read-only, read-write */
1576 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1577 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1578 s->s_flags &= ~MS_RDONLY;
1579 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1580 if (!old_format_only(s))
1581 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1582 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1583 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1584 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1585 }
1586 /* this will force a full flush of all journal lists */
1587 SB_JOURNAL(s)->j_must_wait = 1;
1588 err = journal_end(&th);
1589 if (err)
1590 goto out_err_unlock;
1591
1592 reiserfs_write_unlock(s);
1593 if (!(*mount_flags & MS_RDONLY)) {
1594 dquot_resume(s, -1);
1595 reiserfs_write_lock(s);
1596 finish_unfinished(s);
1597 reiserfs_write_unlock(s);
1598 reiserfs_xattr_init(s, *mount_flags);
1599 }
1600
1601 out_ok_unlocked:
1602 if (new_opts)
1603 replace_mount_options(s, new_opts);
1604 return 0;
1605
1606 out_err_unlock:
1607 reiserfs_write_unlock(s);
1608 out_err:
1609 kfree(new_opts);
1610 return err;
1611 }
1612
1613 static int read_super_block(struct super_block *s, int offset)
1614 {
1615 struct buffer_head *bh;
1616 struct reiserfs_super_block *rs;
1617 int fs_blocksize;
1618
1619 bh = sb_bread(s, offset / s->s_blocksize);
1620 if (!bh) {
1621 reiserfs_warning(s, "sh-2006",
1622 "bread failed (dev %s, block %lu, size %lu)",
1623 s->s_id, offset / s->s_blocksize,
1624 s->s_blocksize);
1625 return 1;
1626 }
1627
1628 rs = (struct reiserfs_super_block *)bh->b_data;
1629 if (!is_any_reiserfs_magic_string(rs)) {
1630 brelse(bh);
1631 return 1;
1632 }
1633 /*
1634 * ok, reiserfs signature (old or new) found in at the given offset
1635 */
1636 fs_blocksize = sb_blocksize(rs);
1637 brelse(bh);
1638 sb_set_blocksize(s, fs_blocksize);
1639
1640 bh = sb_bread(s, offset / s->s_blocksize);
1641 if (!bh) {
1642 reiserfs_warning(s, "sh-2007",
1643 "bread failed (dev %s, block %lu, size %lu)",
1644 s->s_id, offset / s->s_blocksize,
1645 s->s_blocksize);
1646 return 1;
1647 }
1648
1649 rs = (struct reiserfs_super_block *)bh->b_data;
1650 if (sb_blocksize(rs) != s->s_blocksize) {
1651 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1652 "filesystem on (dev %s, block %llu, size %lu)",
1653 s->s_id,
1654 (unsigned long long)bh->b_blocknr,
1655 s->s_blocksize);
1656 brelse(bh);
1657 return 1;
1658 }
1659
1660 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1661 brelse(bh);
1662 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1663 "--rebuild-tree run detected. Please run\n"
1664 "reiserfsck --rebuild-tree and wait for a "
1665 "completion. If that fails\n"
1666 "get newer reiserfsprogs package");
1667 return 1;
1668 }
1669
1670 SB_BUFFER_WITH_SB(s) = bh;
1671 SB_DISK_SUPER_BLOCK(s) = rs;
1672
1673 /*
1674 * magic is of non-standard journal filesystem, look at s_version to
1675 * find which format is in use
1676 */
1677 if (is_reiserfs_jr(rs)) {
1678 if (sb_version(rs) == REISERFS_VERSION_2)
1679 reiserfs_info(s, "found reiserfs format \"3.6\""
1680 " with non-standard journal\n");
1681 else if (sb_version(rs) == REISERFS_VERSION_1)
1682 reiserfs_info(s, "found reiserfs format \"3.5\""
1683 " with non-standard journal\n");
1684 else {
1685 reiserfs_warning(s, "sh-2012", "found unknown "
1686 "format \"%u\" of reiserfs with "
1687 "non-standard magic", sb_version(rs));
1688 return 1;
1689 }
1690 } else
1691 /*
1692 * s_version of standard format may contain incorrect
1693 * information, so we just look at the magic string
1694 */
1695 reiserfs_info(s,
1696 "found reiserfs format \"%s\" with standard journal\n",
1697 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1698
1699 s->s_op = &reiserfs_sops;
1700 s->s_export_op = &reiserfs_export_ops;
1701 #ifdef CONFIG_QUOTA
1702 s->s_qcop = &reiserfs_qctl_operations;
1703 s->dq_op = &reiserfs_quota_operations;
1704 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1705 #endif
1706
1707 /*
1708 * new format is limited by the 32 bit wide i_blocks field, want to
1709 * be one full block below that.
1710 */
1711 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1712 return 0;
1713 }
1714
1715 /* after journal replay, reread all bitmap and super blocks */
1716 static int reread_meta_blocks(struct super_block *s)
1717 {
1718 ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1719 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1720 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1721 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1722 return 1;
1723 }
1724
1725 return 0;
1726 }
1727
1728 /* hash detection stuff */
1729
1730 /*
1731 * if root directory is empty - we set default - Yura's - hash and
1732 * warn about it
1733 * FIXME: we look for only one name in a directory. If tea and yura
1734 * both have the same value - we ask user to send report to the
1735 * mailing list
1736 */
1737 static __u32 find_hash_out(struct super_block *s)
1738 {
1739 int retval;
1740 struct inode *inode;
1741 struct cpu_key key;
1742 INITIALIZE_PATH(path);
1743 struct reiserfs_dir_entry de;
1744 struct reiserfs_de_head *deh;
1745 __u32 hash = DEFAULT_HASH;
1746 __u32 deh_hashval, teahash, r5hash, yurahash;
1747
1748 inode = d_inode(s->s_root);
1749
1750 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1751 retval = search_by_entry_key(s, &key, &path, &de);
1752 if (retval == IO_ERROR) {
1753 pathrelse(&path);
1754 return UNSET_HASH;
1755 }
1756 if (retval == NAME_NOT_FOUND)
1757 de.de_entry_num--;
1758
1759 set_de_name_and_namelen(&de);
1760 deh = de.de_deh + de.de_entry_num;
1761
1762 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1763 /* allow override in this case */
1764 if (reiserfs_rupasov_hash(s))
1765 hash = YURA_HASH;
1766 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1767 goto out;
1768 }
1769
1770 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1771 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1772 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1773 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1774
1775 if ((teahash == r5hash && deh_hashval == r5hash) ||
1776 (teahash == yurahash && deh_hashval == yurahash) ||
1777 (r5hash == yurahash && deh_hashval == yurahash)) {
1778 reiserfs_warning(s, "reiserfs-2506",
1779 "Unable to automatically detect hash "
1780 "function. Please mount with -o "
1781 "hash={tea,rupasov,r5}");
1782 hash = UNSET_HASH;
1783 goto out;
1784 }
1785
1786 if (deh_hashval == yurahash)
1787 hash = YURA_HASH;
1788 else if (deh_hashval == teahash)
1789 hash = TEA_HASH;
1790 else if (deh_hashval == r5hash)
1791 hash = R5_HASH;
1792 else {
1793 reiserfs_warning(s, "reiserfs-2506",
1794 "Unrecognised hash function");
1795 hash = UNSET_HASH;
1796 }
1797 out:
1798 pathrelse(&path);
1799 return hash;
1800 }
1801
1802 /* finds out which hash names are sorted with */
1803 static int what_hash(struct super_block *s)
1804 {
1805 __u32 code;
1806
1807 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1808
1809 /*
1810 * reiserfs_hash_detect() == true if any of the hash mount options
1811 * were used. We must check them to make sure the user isn't
1812 * using a bad hash value
1813 */
1814 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1815 code = find_hash_out(s);
1816
1817 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1818 /*
1819 * detection has found the hash, and we must check against the
1820 * mount options
1821 */
1822 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1823 reiserfs_warning(s, "reiserfs-2507",
1824 "Error, %s hash detected, "
1825 "unable to force rupasov hash",
1826 reiserfs_hashname(code));
1827 code = UNSET_HASH;
1828 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1829 reiserfs_warning(s, "reiserfs-2508",
1830 "Error, %s hash detected, "
1831 "unable to force tea hash",
1832 reiserfs_hashname(code));
1833 code = UNSET_HASH;
1834 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1835 reiserfs_warning(s, "reiserfs-2509",
1836 "Error, %s hash detected, "
1837 "unable to force r5 hash",
1838 reiserfs_hashname(code));
1839 code = UNSET_HASH;
1840 }
1841 } else {
1842 /*
1843 * find_hash_out was not called or
1844 * could not determine the hash
1845 */
1846 if (reiserfs_rupasov_hash(s)) {
1847 code = YURA_HASH;
1848 } else if (reiserfs_tea_hash(s)) {
1849 code = TEA_HASH;
1850 } else if (reiserfs_r5_hash(s)) {
1851 code = R5_HASH;
1852 }
1853 }
1854
1855 /*
1856 * if we are mounted RW, and we have a new valid hash code, update
1857 * the super
1858 */
1859 if (code != UNSET_HASH &&
1860 !(s->s_flags & MS_RDONLY) &&
1861 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1862 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1863 }
1864 return code;
1865 }
1866
1867 /* return pointer to appropriate function */
1868 static hashf_t hash_function(struct super_block *s)
1869 {
1870 switch (what_hash(s)) {
1871 case TEA_HASH:
1872 reiserfs_info(s, "Using tea hash to sort names\n");
1873 return keyed_hash;
1874 case YURA_HASH:
1875 reiserfs_info(s, "Using rupasov hash to sort names\n");
1876 return yura_hash;
1877 case R5_HASH:
1878 reiserfs_info(s, "Using r5 hash to sort names\n");
1879 return r5_hash;
1880 }
1881 return NULL;
1882 }
1883
1884 /* this is used to set up correct value for old partitions */
1885 static int function2code(hashf_t func)
1886 {
1887 if (func == keyed_hash)
1888 return TEA_HASH;
1889 if (func == yura_hash)
1890 return YURA_HASH;
1891 if (func == r5_hash)
1892 return R5_HASH;
1893
1894 BUG(); /* should never happen */
1895
1896 return 0;
1897 }
1898
1899 #define SWARN(silent, s, id, ...) \
1900 if (!(silent)) \
1901 reiserfs_warning(s, id, __VA_ARGS__)
1902
1903 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1904 {
1905 struct inode *root_inode;
1906 struct reiserfs_transaction_handle th;
1907 int old_format = 0;
1908 unsigned long blocks;
1909 unsigned int commit_max_age = 0;
1910 int jinit_done = 0;
1911 struct reiserfs_iget_args args;
1912 struct reiserfs_super_block *rs;
1913 char *jdev_name;
1914 struct reiserfs_sb_info *sbi;
1915 int errval = -EINVAL;
1916 char *qf_names[REISERFS_MAXQUOTAS] = {};
1917 unsigned int qfmt = 0;
1918
1919 save_mount_options(s, data);
1920
1921 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1922 if (!sbi)
1923 return -ENOMEM;
1924 s->s_fs_info = sbi;
1925 /* Set default values for options: non-aggressive tails, RO on errors */
1926 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1927 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1928 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1929 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1930 sbi->s_alloc_options.preallocmin = 0;
1931 /* Preallocate by 16 blocks (17-1) at once */
1932 sbi->s_alloc_options.preallocsize = 17;
1933 /* setup default block allocator options */
1934 reiserfs_init_alloc_options(s);
1935
1936 spin_lock_init(&sbi->old_work_lock);
1937 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1938 mutex_init(&sbi->lock);
1939 sbi->lock_depth = -1;
1940
1941 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1942 s->s_id);
1943 if (!sbi->commit_wq) {
1944 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1945 errval = -ENOMEM;
1946 goto error_unlocked;
1947 }
1948
1949 jdev_name = NULL;
1950 if (reiserfs_parse_options
1951 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1952 &commit_max_age, qf_names, &qfmt) == 0) {
1953 goto error_unlocked;
1954 }
1955 if (jdev_name && jdev_name[0]) {
1956 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1957 if (!sbi->s_jdev) {
1958 SWARN(silent, s, "", "Cannot allocate memory for "
1959 "journal device name");
1960 goto error;
1961 }
1962 }
1963 #ifdef CONFIG_QUOTA
1964 handle_quota_files(s, qf_names, &qfmt);
1965 #endif
1966
1967 if (blocks) {
1968 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1969 goto error_unlocked;
1970 }
1971
1972 /*
1973 * try old format (undistributed bitmap, super block in 8-th 1k
1974 * block of a device)
1975 */
1976 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1977 old_format = 1;
1978
1979 /*
1980 * try new format (64-th 1k block), which can contain reiserfs
1981 * super block
1982 */
1983 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1984 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1985 s->s_id);
1986 goto error_unlocked;
1987 }
1988
1989 rs = SB_DISK_SUPER_BLOCK(s);
1990 /*
1991 * Let's do basic sanity check to verify that underlying device is not
1992 * smaller than the filesystem. If the check fails then abort and
1993 * scream, because bad stuff will happen otherwise.
1994 */
1995 if (s->s_bdev && s->s_bdev->bd_inode
1996 && i_size_read(s->s_bdev->bd_inode) <
1997 sb_block_count(rs) * sb_blocksize(rs)) {
1998 SWARN(silent, s, "", "Filesystem cannot be "
1999 "mounted because it is bigger than the device");
2000 SWARN(silent, s, "", "You may need to run fsck "
2001 "or increase size of your LVM partition");
2002 SWARN(silent, s, "", "Or may be you forgot to "
2003 "reboot after fdisk when it told you to");
2004 goto error_unlocked;
2005 }
2006
2007 sbi->s_mount_state = SB_REISERFS_STATE(s);
2008 sbi->s_mount_state = REISERFS_VALID_FS;
2009
2010 if ((errval = reiserfs_init_bitmap_cache(s))) {
2011 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2012 goto error_unlocked;
2013 }
2014
2015 errval = -EINVAL;
2016 #ifdef CONFIG_REISERFS_CHECK
2017 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2018 SWARN(silent, s, "", "- it is slow mode for debugging.");
2019 #endif
2020
2021 /* make data=ordered the default */
2022 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2023 !reiserfs_data_writeback(s)) {
2024 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2025 }
2026
2027 if (reiserfs_data_log(s)) {
2028 reiserfs_info(s, "using journaled data mode\n");
2029 } else if (reiserfs_data_ordered(s)) {
2030 reiserfs_info(s, "using ordered data mode\n");
2031 } else {
2032 reiserfs_info(s, "using writeback data mode\n");
2033 }
2034 if (reiserfs_barrier_flush(s)) {
2035 printk("reiserfs: using flush barriers\n");
2036 }
2037
2038 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2039 SWARN(silent, s, "sh-2022",
2040 "unable to initialize journal space");
2041 goto error_unlocked;
2042 } else {
2043 /*
2044 * once this is set, journal_release must be called
2045 * if we error out of the mount
2046 */
2047 jinit_done = 1;
2048 }
2049
2050 if (reread_meta_blocks(s)) {
2051 SWARN(silent, s, "jmacd-9",
2052 "unable to reread meta blocks after journal init");
2053 goto error_unlocked;
2054 }
2055
2056 if (replay_only(s))
2057 goto error_unlocked;
2058
2059 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2060 SWARN(silent, s, "clm-7000",
2061 "Detected readonly device, marking FS readonly");
2062 s->s_flags |= MS_RDONLY;
2063 }
2064 args.objectid = REISERFS_ROOT_OBJECTID;
2065 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2066 root_inode =
2067 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2068 reiserfs_init_locked_inode, (void *)&args);
2069 if (!root_inode) {
2070 SWARN(silent, s, "jmacd-10", "get root inode failed");
2071 goto error_unlocked;
2072 }
2073
2074 /*
2075 * This path assumed to be called with the BKL in the old times.
2076 * Now we have inherited the big reiserfs lock from it and many
2077 * reiserfs helpers called in the mount path and elsewhere require
2078 * this lock to be held even if it's not always necessary. Let's be
2079 * conservative and hold it early. The window can be reduced after
2080 * careful review of the code.
2081 */
2082 reiserfs_write_lock(s);
2083
2084 if (root_inode->i_state & I_NEW) {
2085 reiserfs_read_locked_inode(root_inode, &args);
2086 unlock_new_inode(root_inode);
2087 }
2088
2089 s->s_root = d_make_root(root_inode);
2090 if (!s->s_root)
2091 goto error;
2092 /* define and initialize hash function */
2093 sbi->s_hash_function = hash_function(s);
2094 if (sbi->s_hash_function == NULL) {
2095 dput(s->s_root);
2096 s->s_root = NULL;
2097 goto error;
2098 }
2099
2100 if (is_reiserfs_3_5(rs)
2101 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2102 set_bit(REISERFS_3_5, &sbi->s_properties);
2103 else if (old_format)
2104 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2105 else
2106 set_bit(REISERFS_3_6, &sbi->s_properties);
2107
2108 if (!(s->s_flags & MS_RDONLY)) {
2109
2110 errval = journal_begin(&th, s, 1);
2111 if (errval) {
2112 dput(s->s_root);
2113 s->s_root = NULL;
2114 goto error;
2115 }
2116 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2117
2118 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2119 set_sb_fs_state(rs, 0);
2120
2121 /*
2122 * Clear out s_bmap_nr if it would wrap. We can handle this
2123 * case, but older revisions can't. This will cause the
2124 * file system to fail mount on those older implementations,
2125 * avoiding corruption. -jeffm
2126 */
2127 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2128 sb_bmap_nr(rs) != 0) {
2129 reiserfs_warning(s, "super-2030", "This file system "
2130 "claims to use %u bitmap blocks in "
2131 "its super block, but requires %u. "
2132 "Clearing to zero.", sb_bmap_nr(rs),
2133 reiserfs_bmap_count(s));
2134
2135 set_sb_bmap_nr(rs, 0);
2136 }
2137
2138 if (old_format_only(s)) {
2139 /*
2140 * filesystem of format 3.5 either with standard
2141 * or non-standard journal
2142 */
2143 if (convert_reiserfs(s)) {
2144 /* and -o conv is given */
2145 if (!silent)
2146 reiserfs_info(s,
2147 "converting 3.5 filesystem to the 3.6 format");
2148
2149 if (is_reiserfs_3_5(rs))
2150 /*
2151 * put magic string of 3.6 format.
2152 * 2.2 will not be able to
2153 * mount this filesystem anymore
2154 */
2155 memcpy(rs->s_v1.s_magic,
2156 reiserfs_3_6_magic_string,
2157 sizeof
2158 (reiserfs_3_6_magic_string));
2159
2160 set_sb_version(rs, REISERFS_VERSION_2);
2161 reiserfs_convert_objectid_map_v1(s);
2162 set_bit(REISERFS_3_6, &sbi->s_properties);
2163 clear_bit(REISERFS_3_5, &sbi->s_properties);
2164 } else if (!silent) {
2165 reiserfs_info(s, "using 3.5.x disk format\n");
2166 }
2167 } else
2168 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2169
2170
2171 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2172 errval = journal_end(&th);
2173 if (errval) {
2174 dput(s->s_root);
2175 s->s_root = NULL;
2176 goto error;
2177 }
2178
2179 reiserfs_write_unlock(s);
2180 if ((errval = reiserfs_lookup_privroot(s)) ||
2181 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2182 dput(s->s_root);
2183 s->s_root = NULL;
2184 goto error_unlocked;
2185 }
2186 reiserfs_write_lock(s);
2187
2188 /*
2189 * look for files which were to be removed in previous session
2190 */
2191 finish_unfinished(s);
2192 } else {
2193 if (old_format_only(s) && !silent) {
2194 reiserfs_info(s, "using 3.5.x disk format\n");
2195 }
2196
2197 reiserfs_write_unlock(s);
2198 if ((errval = reiserfs_lookup_privroot(s)) ||
2199 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2200 dput(s->s_root);
2201 s->s_root = NULL;
2202 goto error_unlocked;
2203 }
2204 reiserfs_write_lock(s);
2205 }
2206 /*
2207 * mark hash in super block: it could be unset. overwrite should be ok
2208 */
2209 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2210
2211 handle_attrs(s);
2212
2213 reiserfs_proc_info_init(s);
2214
2215 init_waitqueue_head(&(sbi->s_wait));
2216 spin_lock_init(&sbi->bitmap_lock);
2217
2218 reiserfs_write_unlock(s);
2219
2220 return (0);
2221
2222 error:
2223 reiserfs_write_unlock(s);
2224
2225 error_unlocked:
2226 /* kill the commit thread, free journal ram */
2227 if (jinit_done) {
2228 reiserfs_write_lock(s);
2229 journal_release_error(NULL, s);
2230 reiserfs_write_unlock(s);
2231 }
2232
2233 if (sbi->commit_wq)
2234 destroy_workqueue(sbi->commit_wq);
2235
2236 reiserfs_cancel_old_flush(s);
2237
2238 reiserfs_free_bitmap_cache(s);
2239 if (SB_BUFFER_WITH_SB(s))
2240 brelse(SB_BUFFER_WITH_SB(s));
2241 #ifdef CONFIG_QUOTA
2242 {
2243 int j;
2244 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2245 kfree(qf_names[j]);
2246 }
2247 #endif
2248 kfree(sbi);
2249
2250 s->s_fs_info = NULL;
2251 return errval;
2252 }
2253
2254 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2255 {
2256 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2257
2258 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2259 buf->f_bfree = sb_free_blocks(rs);
2260 buf->f_bavail = buf->f_bfree;
2261 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2262 buf->f_bsize = dentry->d_sb->s_blocksize;
2263 /* changed to accommodate gcc folks. */
2264 buf->f_type = REISERFS_SUPER_MAGIC;
2265 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2266 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2267 sizeof(rs->s_uuid)/2);
2268
2269 return 0;
2270 }
2271
2272 #ifdef CONFIG_QUOTA
2273 static int reiserfs_write_dquot(struct dquot *dquot)
2274 {
2275 struct reiserfs_transaction_handle th;
2276 int ret, err;
2277 int depth;
2278
2279 reiserfs_write_lock(dquot->dq_sb);
2280 ret =
2281 journal_begin(&th, dquot->dq_sb,
2282 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2283 if (ret)
2284 goto out;
2285 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2286 ret = dquot_commit(dquot);
2287 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2288 err = journal_end(&th);
2289 if (!ret && err)
2290 ret = err;
2291 out:
2292 reiserfs_write_unlock(dquot->dq_sb);
2293 return ret;
2294 }
2295
2296 static int reiserfs_acquire_dquot(struct dquot *dquot)
2297 {
2298 struct reiserfs_transaction_handle th;
2299 int ret, err;
2300 int depth;
2301
2302 reiserfs_write_lock(dquot->dq_sb);
2303 ret =
2304 journal_begin(&th, dquot->dq_sb,
2305 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2306 if (ret)
2307 goto out;
2308 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2309 ret = dquot_acquire(dquot);
2310 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2311 err = journal_end(&th);
2312 if (!ret && err)
2313 ret = err;
2314 out:
2315 reiserfs_write_unlock(dquot->dq_sb);
2316 return ret;
2317 }
2318
2319 static int reiserfs_release_dquot(struct dquot *dquot)
2320 {
2321 struct reiserfs_transaction_handle th;
2322 int ret, err;
2323
2324 reiserfs_write_lock(dquot->dq_sb);
2325 ret =
2326 journal_begin(&th, dquot->dq_sb,
2327 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2328 reiserfs_write_unlock(dquot->dq_sb);
2329 if (ret) {
2330 /* Release dquot anyway to avoid endless cycle in dqput() */
2331 dquot_release(dquot);
2332 goto out;
2333 }
2334 ret = dquot_release(dquot);
2335 reiserfs_write_lock(dquot->dq_sb);
2336 err = journal_end(&th);
2337 if (!ret && err)
2338 ret = err;
2339 reiserfs_write_unlock(dquot->dq_sb);
2340 out:
2341 return ret;
2342 }
2343
2344 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2345 {
2346 /* Are we journaling quotas? */
2347 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2348 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2349 dquot_mark_dquot_dirty(dquot);
2350 return reiserfs_write_dquot(dquot);
2351 } else
2352 return dquot_mark_dquot_dirty(dquot);
2353 }
2354
2355 static int reiserfs_write_info(struct super_block *sb, int type)
2356 {
2357 struct reiserfs_transaction_handle th;
2358 int ret, err;
2359 int depth;
2360
2361 /* Data block + inode block */
2362 reiserfs_write_lock(sb);
2363 ret = journal_begin(&th, sb, 2);
2364 if (ret)
2365 goto out;
2366 depth = reiserfs_write_unlock_nested(sb);
2367 ret = dquot_commit_info(sb, type);
2368 reiserfs_write_lock_nested(sb, depth);
2369 err = journal_end(&th);
2370 if (!ret && err)
2371 ret = err;
2372 out:
2373 reiserfs_write_unlock(sb);
2374 return ret;
2375 }
2376
2377 /*
2378 * Turn on quotas during mount time - we need to find the quota file and such...
2379 */
2380 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2381 {
2382 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2383 REISERFS_SB(sb)->s_jquota_fmt, type);
2384 }
2385
2386 /*
2387 * Standard function to be called on quota_on
2388 */
2389 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2390 const struct path *path)
2391 {
2392 int err;
2393 struct inode *inode;
2394 struct reiserfs_transaction_handle th;
2395 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2396
2397 reiserfs_write_lock(sb);
2398 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2399 err = -EINVAL;
2400 goto out;
2401 }
2402
2403 /* Quotafile not on the same filesystem? */
2404 if (path->dentry->d_sb != sb) {
2405 err = -EXDEV;
2406 goto out;
2407 }
2408 inode = d_inode(path->dentry);
2409 /*
2410 * We must not pack tails for quota files on reiserfs for quota
2411 * IO to work
2412 */
2413 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2414 err = reiserfs_unpack(inode, NULL);
2415 if (err) {
2416 reiserfs_warning(sb, "super-6520",
2417 "Unpacking tail of quota file failed"
2418 " (%d). Cannot turn on quotas.", err);
2419 err = -EINVAL;
2420 goto out;
2421 }
2422 mark_inode_dirty(inode);
2423 }
2424 /* Journaling quota? */
2425 if (REISERFS_SB(sb)->s_qf_names[type]) {
2426 /* Quotafile not of fs root? */
2427 if (path->dentry->d_parent != sb->s_root)
2428 reiserfs_warning(sb, "super-6521",
2429 "Quota file not on filesystem root. "
2430 "Journalled quota will not work.");
2431 }
2432
2433 /*
2434 * When we journal data on quota file, we have to flush journal to see
2435 * all updates to the file when we bypass pagecache...
2436 */
2437 if (reiserfs_file_data_log(inode)) {
2438 /* Just start temporary transaction and finish it */
2439 err = journal_begin(&th, sb, 1);
2440 if (err)
2441 goto out;
2442 err = journal_end_sync(&th);
2443 if (err)
2444 goto out;
2445 }
2446 reiserfs_write_unlock(sb);
2447 err = dquot_quota_on(sb, type, format_id, path);
2448 if (!err) {
2449 inode_lock(inode);
2450 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2451 REISERFS_NOATIME_FL;
2452 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2453 S_IMMUTABLE | S_NOATIME);
2454 inode_unlock(inode);
2455 mark_inode_dirty(inode);
2456 }
2457 return err;
2458 out:
2459 reiserfs_write_unlock(sb);
2460 return err;
2461 }
2462
2463 static int reiserfs_quota_off(struct super_block *sb, int type)
2464 {
2465 int err;
2466 struct inode *inode = sb_dqopt(sb)->files[type];
2467
2468 if (!inode || !igrab(inode))
2469 goto out;
2470
2471 err = dquot_quota_off(sb, type);
2472 if (err)
2473 goto out_put;
2474
2475 inode_lock(inode);
2476 REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2477 REISERFS_NOATIME_FL);
2478 inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2479 inode_unlock(inode);
2480 mark_inode_dirty(inode);
2481 out_put:
2482 iput(inode);
2483 return err;
2484 out:
2485 return dquot_quota_off(sb, type);
2486 }
2487
2488 /*
2489 * Read data from quotafile - avoid pagecache and such because we cannot afford
2490 * acquiring the locks... As quota files are never truncated and quota code
2491 * itself serializes the operations (and no one else should touch the files)
2492 * we don't have to be afraid of races
2493 */
2494 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2495 size_t len, loff_t off)
2496 {
2497 struct inode *inode = sb_dqopt(sb)->files[type];
2498 unsigned long blk = off >> sb->s_blocksize_bits;
2499 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2500 size_t toread;
2501 struct buffer_head tmp_bh, *bh;
2502 loff_t i_size = i_size_read(inode);
2503
2504 if (off > i_size)
2505 return 0;
2506 if (off + len > i_size)
2507 len = i_size - off;
2508 toread = len;
2509 while (toread > 0) {
2510 tocopy =
2511 sb->s_blocksize - offset <
2512 toread ? sb->s_blocksize - offset : toread;
2513 tmp_bh.b_state = 0;
2514 /*
2515 * Quota files are without tails so we can safely
2516 * use this function
2517 */
2518 reiserfs_write_lock(sb);
2519 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2520 reiserfs_write_unlock(sb);
2521 if (err)
2522 return err;
2523 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2524 memset(data, 0, tocopy);
2525 else {
2526 bh = sb_bread(sb, tmp_bh.b_blocknr);
2527 if (!bh)
2528 return -EIO;
2529 memcpy(data, bh->b_data + offset, tocopy);
2530 brelse(bh);
2531 }
2532 offset = 0;
2533 toread -= tocopy;
2534 data += tocopy;
2535 blk++;
2536 }
2537 return len;
2538 }
2539
2540 /*
2541 * Write to quotafile (we know the transaction is already started and has
2542 * enough credits)
2543 */
2544 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2545 const char *data, size_t len, loff_t off)
2546 {
2547 struct inode *inode = sb_dqopt(sb)->files[type];
2548 unsigned long blk = off >> sb->s_blocksize_bits;
2549 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2550 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2551 size_t towrite = len;
2552 struct buffer_head tmp_bh, *bh;
2553
2554 if (!current->journal_info) {
2555 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2556 (unsigned long long)off, (unsigned long long)len);
2557 return -EIO;
2558 }
2559 while (towrite > 0) {
2560 tocopy = sb->s_blocksize - offset < towrite ?
2561 sb->s_blocksize - offset : towrite;
2562 tmp_bh.b_state = 0;
2563 reiserfs_write_lock(sb);
2564 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2565 reiserfs_write_unlock(sb);
2566 if (err)
2567 goto out;
2568 if (offset || tocopy != sb->s_blocksize)
2569 bh = sb_bread(sb, tmp_bh.b_blocknr);
2570 else
2571 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2572 if (!bh) {
2573 err = -EIO;
2574 goto out;
2575 }
2576 lock_buffer(bh);
2577 memcpy(bh->b_data + offset, data, tocopy);
2578 flush_dcache_page(bh->b_page);
2579 set_buffer_uptodate(bh);
2580 unlock_buffer(bh);
2581 reiserfs_write_lock(sb);
2582 reiserfs_prepare_for_journal(sb, bh, 1);
2583 journal_mark_dirty(current->journal_info, bh);
2584 if (!journal_quota)
2585 reiserfs_add_ordered_list(inode, bh);
2586 reiserfs_write_unlock(sb);
2587 brelse(bh);
2588 offset = 0;
2589 towrite -= tocopy;
2590 data += tocopy;
2591 blk++;
2592 }
2593 out:
2594 if (len == towrite)
2595 return err;
2596 if (inode->i_size < off + len - towrite)
2597 i_size_write(inode, off + len - towrite);
2598 inode->i_version++;
2599 inode->i_mtime = inode->i_ctime = current_time(inode);
2600 mark_inode_dirty(inode);
2601 return len - towrite;
2602 }
2603
2604 #endif
2605
2606 static struct dentry *get_super_block(struct file_system_type *fs_type,
2607 int flags, const char *dev_name,
2608 void *data)
2609 {
2610 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2611 }
2612
2613 static int __init init_reiserfs_fs(void)
2614 {
2615 int ret;
2616
2617 ret = init_inodecache();
2618 if (ret)
2619 return ret;
2620
2621 reiserfs_proc_info_global_init();
2622
2623 ret = register_filesystem(&reiserfs_fs_type);
2624 if (ret)
2625 goto out;
2626
2627 return 0;
2628 out:
2629 reiserfs_proc_info_global_done();
2630 destroy_inodecache();
2631
2632 return ret;
2633 }
2634
2635 static void __exit exit_reiserfs_fs(void)
2636 {
2637 reiserfs_proc_info_global_done();
2638 unregister_filesystem(&reiserfs_fs_type);
2639 destroy_inodecache();
2640 }
2641
2642 struct file_system_type reiserfs_fs_type = {
2643 .owner = THIS_MODULE,
2644 .name = "reiserfs",
2645 .mount = get_super_block,
2646 .kill_sb = reiserfs_kill_sb,
2647 .fs_flags = FS_REQUIRES_DEV,
2648 };
2649 MODULE_ALIAS_FS("reiserfs");
2650
2651 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2652 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2653 MODULE_LICENSE("GPL");
2654
2655 module_init(init_reiserfs_fs);
2656 module_exit(exit_reiserfs_fs);
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