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