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Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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_err;
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_err;
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 err = dquot_suspend(s, -1);
1393 if (err < 0)
1394 goto out_err;
1395
1396 /* try to remount file system with read-only permissions */
1397 if (sb_umount_state(rs) == REISERFS_VALID_FS
1398 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1399 goto out_ok;
1400 }
1401
1402 err = journal_begin(&th, s, 10);
1403 if (err)
1404 goto out_err;
1405
1406 /* Mounting a rw partition read-only. */
1407 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1408 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1409 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1410 } else {
1411 /* remount read-write */
1412 if (!(s->s_flags & MS_RDONLY)) {
1413 reiserfs_xattr_init(s, *mount_flags);
1414 goto out_ok; /* We are read-write already */
1415 }
1416
1417 if (reiserfs_is_journal_aborted(journal)) {
1418 err = journal->j_errno;
1419 goto out_err;
1420 }
1421
1422 handle_data_mode(s, mount_options);
1423 handle_barrier_mode(s, mount_options);
1424 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1425 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1426 err = journal_begin(&th, s, 10);
1427 if (err)
1428 goto out_err;
1429
1430 /* Mount a partition which is read-only, read-write */
1431 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1432 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1433 s->s_flags &= ~MS_RDONLY;
1434 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1435 if (!old_format_only(s))
1436 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1437 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1438 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1439 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1440 }
1441 /* this will force a full flush of all journal lists */
1442 SB_JOURNAL(s)->j_must_wait = 1;
1443 err = journal_end(&th, s, 10);
1444 if (err)
1445 goto out_err;
1446
1447 if (!(*mount_flags & MS_RDONLY)) {
1448 dquot_resume(s, -1);
1449 finish_unfinished(s);
1450 reiserfs_xattr_init(s, *mount_flags);
1451 }
1452
1453 out_ok:
1454 replace_mount_options(s, new_opts);
1455 reiserfs_write_unlock(s);
1456 return 0;
1457
1458 out_err:
1459 kfree(new_opts);
1460 reiserfs_write_unlock(s);
1461 return err;
1462 }
1463
1464 static int read_super_block(struct super_block *s, int offset)
1465 {
1466 struct buffer_head *bh;
1467 struct reiserfs_super_block *rs;
1468 int fs_blocksize;
1469
1470 bh = sb_bread(s, offset / s->s_blocksize);
1471 if (!bh) {
1472 reiserfs_warning(s, "sh-2006",
1473 "bread failed (dev %s, block %lu, size %lu)",
1474 reiserfs_bdevname(s), offset / s->s_blocksize,
1475 s->s_blocksize);
1476 return 1;
1477 }
1478
1479 rs = (struct reiserfs_super_block *)bh->b_data;
1480 if (!is_any_reiserfs_magic_string(rs)) {
1481 brelse(bh);
1482 return 1;
1483 }
1484 //
1485 // ok, reiserfs signature (old or new) found in at the given offset
1486 //
1487 fs_blocksize = sb_blocksize(rs);
1488 brelse(bh);
1489 sb_set_blocksize(s, fs_blocksize);
1490
1491 bh = sb_bread(s, offset / s->s_blocksize);
1492 if (!bh) {
1493 reiserfs_warning(s, "sh-2007",
1494 "bread failed (dev %s, block %lu, size %lu)",
1495 reiserfs_bdevname(s), offset / s->s_blocksize,
1496 s->s_blocksize);
1497 return 1;
1498 }
1499
1500 rs = (struct reiserfs_super_block *)bh->b_data;
1501 if (sb_blocksize(rs) != s->s_blocksize) {
1502 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1503 "filesystem on (dev %s, block %Lu, size %lu)",
1504 reiserfs_bdevname(s),
1505 (unsigned long long)bh->b_blocknr,
1506 s->s_blocksize);
1507 brelse(bh);
1508 return 1;
1509 }
1510
1511 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1512 brelse(bh);
1513 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1514 "--rebuild-tree run detected. Please run\n"
1515 "reiserfsck --rebuild-tree and wait for a "
1516 "completion. If that fails\n"
1517 "get newer reiserfsprogs package");
1518 return 1;
1519 }
1520
1521 SB_BUFFER_WITH_SB(s) = bh;
1522 SB_DISK_SUPER_BLOCK(s) = rs;
1523
1524 if (is_reiserfs_jr(rs)) {
1525 /* magic is of non-standard journal filesystem, look at s_version to
1526 find which format is in use */
1527 if (sb_version(rs) == REISERFS_VERSION_2)
1528 reiserfs_info(s, "found reiserfs format \"3.6\""
1529 " with non-standard journal\n");
1530 else if (sb_version(rs) == REISERFS_VERSION_1)
1531 reiserfs_info(s, "found reiserfs format \"3.5\""
1532 " with non-standard journal\n");
1533 else {
1534 reiserfs_warning(s, "sh-2012", "found unknown "
1535 "format \"%u\" of reiserfs with "
1536 "non-standard magic", sb_version(rs));
1537 return 1;
1538 }
1539 } else
1540 /* s_version of standard format may contain incorrect information,
1541 so we just look at the magic string */
1542 reiserfs_info(s,
1543 "found reiserfs format \"%s\" with standard journal\n",
1544 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1545
1546 s->s_op = &reiserfs_sops;
1547 s->s_export_op = &reiserfs_export_ops;
1548 #ifdef CONFIG_QUOTA
1549 s->s_qcop = &reiserfs_qctl_operations;
1550 s->dq_op = &reiserfs_quota_operations;
1551 #endif
1552
1553 /* new format is limited by the 32 bit wide i_blocks field, want to
1554 ** be one full block below that.
1555 */
1556 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1557 return 0;
1558 }
1559
1560 /* after journal replay, reread all bitmap and super blocks */
1561 static int reread_meta_blocks(struct super_block *s)
1562 {
1563 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1564 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1565 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1566 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1567 return 1;
1568 }
1569
1570 return 0;
1571 }
1572
1573 /////////////////////////////////////////////////////
1574 // hash detection stuff
1575
1576 // if root directory is empty - we set default - Yura's - hash and
1577 // warn about it
1578 // FIXME: we look for only one name in a directory. If tea and yura
1579 // bith have the same value - we ask user to send report to the
1580 // mailing list
1581 static __u32 find_hash_out(struct super_block *s)
1582 {
1583 int retval;
1584 struct inode *inode;
1585 struct cpu_key key;
1586 INITIALIZE_PATH(path);
1587 struct reiserfs_dir_entry de;
1588 __u32 hash = DEFAULT_HASH;
1589
1590 inode = s->s_root->d_inode;
1591
1592 do { // Some serious "goto"-hater was there ;)
1593 u32 teahash, r5hash, yurahash;
1594
1595 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1596 retval = search_by_entry_key(s, &key, &path, &de);
1597 if (retval == IO_ERROR) {
1598 pathrelse(&path);
1599 return UNSET_HASH;
1600 }
1601 if (retval == NAME_NOT_FOUND)
1602 de.de_entry_num--;
1603 set_de_name_and_namelen(&de);
1604 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1605 /* allow override in this case */
1606 if (reiserfs_rupasov_hash(s)) {
1607 hash = YURA_HASH;
1608 }
1609 reiserfs_info(s, "FS seems to be empty, autodetect "
1610 "is using the default hash\n");
1611 break;
1612 }
1613 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1614 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1615 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1616 if (((teahash == r5hash)
1617 &&
1618 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1619 == r5hash)) || ((teahash == yurahash)
1620 && (yurahash ==
1621 GET_HASH_VALUE(deh_offset
1622 (&
1623 (de.
1624 de_deh[de.
1625 de_entry_num])))))
1626 || ((r5hash == yurahash)
1627 && (yurahash ==
1628 GET_HASH_VALUE(deh_offset
1629 (&(de.de_deh[de.de_entry_num])))))) {
1630 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1631 "automatically detect hash function. "
1632 "Please mount with -o "
1633 "hash={tea,rupasov,r5}");
1634 hash = UNSET_HASH;
1635 break;
1636 }
1637 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1638 yurahash)
1639 hash = YURA_HASH;
1640 else if (GET_HASH_VALUE
1641 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1642 hash = TEA_HASH;
1643 else if (GET_HASH_VALUE
1644 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1645 hash = R5_HASH;
1646 else {
1647 reiserfs_warning(s, "reiserfs-2506",
1648 "Unrecognised hash function");
1649 hash = UNSET_HASH;
1650 }
1651 } while (0);
1652
1653 pathrelse(&path);
1654 return hash;
1655 }
1656
1657 // finds out which hash names are sorted with
1658 static int what_hash(struct super_block *s)
1659 {
1660 __u32 code;
1661
1662 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1663
1664 /* reiserfs_hash_detect() == true if any of the hash mount options
1665 ** were used. We must check them to make sure the user isn't
1666 ** using a bad hash value
1667 */
1668 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1669 code = find_hash_out(s);
1670
1671 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1672 /* detection has found the hash, and we must check against the
1673 ** mount options
1674 */
1675 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1676 reiserfs_warning(s, "reiserfs-2507",
1677 "Error, %s hash detected, "
1678 "unable to force rupasov hash",
1679 reiserfs_hashname(code));
1680 code = UNSET_HASH;
1681 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1682 reiserfs_warning(s, "reiserfs-2508",
1683 "Error, %s hash detected, "
1684 "unable to force tea hash",
1685 reiserfs_hashname(code));
1686 code = UNSET_HASH;
1687 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1688 reiserfs_warning(s, "reiserfs-2509",
1689 "Error, %s hash detected, "
1690 "unable to force r5 hash",
1691 reiserfs_hashname(code));
1692 code = UNSET_HASH;
1693 }
1694 } else {
1695 /* find_hash_out was not called or could not determine the hash */
1696 if (reiserfs_rupasov_hash(s)) {
1697 code = YURA_HASH;
1698 } else if (reiserfs_tea_hash(s)) {
1699 code = TEA_HASH;
1700 } else if (reiserfs_r5_hash(s)) {
1701 code = R5_HASH;
1702 }
1703 }
1704
1705 /* if we are mounted RW, and we have a new valid hash code, update
1706 ** the super
1707 */
1708 if (code != UNSET_HASH &&
1709 !(s->s_flags & MS_RDONLY) &&
1710 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1711 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1712 }
1713 return code;
1714 }
1715
1716 // return pointer to appropriate function
1717 static hashf_t hash_function(struct super_block *s)
1718 {
1719 switch (what_hash(s)) {
1720 case TEA_HASH:
1721 reiserfs_info(s, "Using tea hash to sort names\n");
1722 return keyed_hash;
1723 case YURA_HASH:
1724 reiserfs_info(s, "Using rupasov hash to sort names\n");
1725 return yura_hash;
1726 case R5_HASH:
1727 reiserfs_info(s, "Using r5 hash to sort names\n");
1728 return r5_hash;
1729 }
1730 return NULL;
1731 }
1732
1733 // this is used to set up correct value for old partitions
1734 static int function2code(hashf_t func)
1735 {
1736 if (func == keyed_hash)
1737 return TEA_HASH;
1738 if (func == yura_hash)
1739 return YURA_HASH;
1740 if (func == r5_hash)
1741 return R5_HASH;
1742
1743 BUG(); // should never happen
1744
1745 return 0;
1746 }
1747
1748 #define SWARN(silent, s, id, ...) \
1749 if (!(silent)) \
1750 reiserfs_warning(s, id, __VA_ARGS__)
1751
1752 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1753 {
1754 struct inode *root_inode;
1755 struct reiserfs_transaction_handle th;
1756 int old_format = 0;
1757 unsigned long blocks;
1758 unsigned int commit_max_age = 0;
1759 int jinit_done = 0;
1760 struct reiserfs_iget_args args;
1761 struct reiserfs_super_block *rs;
1762 char *jdev_name;
1763 struct reiserfs_sb_info *sbi;
1764 int errval = -EINVAL;
1765 char *qf_names[MAXQUOTAS] = {};
1766 unsigned int qfmt = 0;
1767
1768 save_mount_options(s, data);
1769
1770 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1771 if (!sbi)
1772 return -ENOMEM;
1773 s->s_fs_info = sbi;
1774 /* Set default values for options: non-aggressive tails, RO on errors */
1775 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1776 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1777 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1778 /* no preallocation minimum, be smart in
1779 reiserfs_file_write instead */
1780 sbi->s_alloc_options.preallocmin = 0;
1781 /* Preallocate by 16 blocks (17-1) at once */
1782 sbi->s_alloc_options.preallocsize = 17;
1783 /* setup default block allocator options */
1784 reiserfs_init_alloc_options(s);
1785
1786 spin_lock_init(&sbi->old_work_lock);
1787 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1788 mutex_init(&sbi->lock);
1789 sbi->lock_depth = -1;
1790
1791 jdev_name = NULL;
1792 if (reiserfs_parse_options
1793 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1794 &commit_max_age, qf_names, &qfmt) == 0) {
1795 goto error_unlocked;
1796 }
1797 if (jdev_name && jdev_name[0]) {
1798 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1799 if (!sbi->s_jdev) {
1800 SWARN(silent, s, "", "Cannot allocate memory for "
1801 "journal device name");
1802 goto error;
1803 }
1804 }
1805 #ifdef CONFIG_QUOTA
1806 handle_quota_files(s, qf_names, &qfmt);
1807 #endif
1808
1809 if (blocks) {
1810 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1811 goto error_unlocked;
1812 }
1813
1814 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1815 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1816 old_format = 1;
1817 /* try new format (64-th 1k block), which can contain reiserfs super block */
1818 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1819 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1820 reiserfs_bdevname(s));
1821 goto error_unlocked;
1822 }
1823
1824 rs = SB_DISK_SUPER_BLOCK(s);
1825 /* Let's do basic sanity check to verify that underlying device is not
1826 smaller than the filesystem. If the check fails then abort and scream,
1827 because bad stuff will happen otherwise. */
1828 if (s->s_bdev && s->s_bdev->bd_inode
1829 && i_size_read(s->s_bdev->bd_inode) <
1830 sb_block_count(rs) * sb_blocksize(rs)) {
1831 SWARN(silent, s, "", "Filesystem cannot be "
1832 "mounted because it is bigger than the device");
1833 SWARN(silent, s, "", "You may need to run fsck "
1834 "or increase size of your LVM partition");
1835 SWARN(silent, s, "", "Or may be you forgot to "
1836 "reboot after fdisk when it told you to");
1837 goto error_unlocked;
1838 }
1839
1840 sbi->s_mount_state = SB_REISERFS_STATE(s);
1841 sbi->s_mount_state = REISERFS_VALID_FS;
1842
1843 if ((errval = reiserfs_init_bitmap_cache(s))) {
1844 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1845 goto error_unlocked;
1846 }
1847
1848 errval = -EINVAL;
1849 #ifdef CONFIG_REISERFS_CHECK
1850 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1851 SWARN(silent, s, "", "- it is slow mode for debugging.");
1852 #endif
1853
1854 /* make data=ordered the default */
1855 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1856 !reiserfs_data_writeback(s)) {
1857 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1858 }
1859
1860 if (reiserfs_data_log(s)) {
1861 reiserfs_info(s, "using journaled data mode\n");
1862 } else if (reiserfs_data_ordered(s)) {
1863 reiserfs_info(s, "using ordered data mode\n");
1864 } else {
1865 reiserfs_info(s, "using writeback data mode\n");
1866 }
1867 if (reiserfs_barrier_flush(s)) {
1868 printk("reiserfs: using flush barriers\n");
1869 }
1870
1871 // set_device_ro(s->s_dev, 1) ;
1872 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1873 SWARN(silent, s, "sh-2022",
1874 "unable to initialize journal space");
1875 goto error_unlocked;
1876 } else {
1877 jinit_done = 1; /* once this is set, journal_release must be called
1878 ** if we error out of the mount
1879 */
1880 }
1881
1882 if (reread_meta_blocks(s)) {
1883 SWARN(silent, s, "jmacd-9",
1884 "unable to reread meta blocks after journal init");
1885 goto error_unlocked;
1886 }
1887
1888 if (replay_only(s))
1889 goto error_unlocked;
1890
1891 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1892 SWARN(silent, s, "clm-7000",
1893 "Detected readonly device, marking FS readonly");
1894 s->s_flags |= MS_RDONLY;
1895 }
1896 args.objectid = REISERFS_ROOT_OBJECTID;
1897 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1898 root_inode =
1899 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1900 reiserfs_init_locked_inode, (void *)(&args));
1901 if (!root_inode) {
1902 SWARN(silent, s, "jmacd-10", "get root inode failed");
1903 goto error_unlocked;
1904 }
1905
1906 /*
1907 * This path assumed to be called with the BKL in the old times.
1908 * Now we have inherited the big reiserfs lock from it and many
1909 * reiserfs helpers called in the mount path and elsewhere require
1910 * this lock to be held even if it's not always necessary. Let's be
1911 * conservative and hold it early. The window can be reduced after
1912 * careful review of the code.
1913 */
1914 reiserfs_write_lock(s);
1915
1916 if (root_inode->i_state & I_NEW) {
1917 reiserfs_read_locked_inode(root_inode, &args);
1918 unlock_new_inode(root_inode);
1919 }
1920
1921 s->s_root = d_make_root(root_inode);
1922 if (!s->s_root)
1923 goto error;
1924 // define and initialize hash function
1925 sbi->s_hash_function = hash_function(s);
1926 if (sbi->s_hash_function == NULL) {
1927 dput(s->s_root);
1928 s->s_root = NULL;
1929 goto error;
1930 }
1931
1932 if (is_reiserfs_3_5(rs)
1933 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1934 set_bit(REISERFS_3_5, &(sbi->s_properties));
1935 else if (old_format)
1936 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1937 else
1938 set_bit(REISERFS_3_6, &(sbi->s_properties));
1939
1940 if (!(s->s_flags & MS_RDONLY)) {
1941
1942 errval = journal_begin(&th, s, 1);
1943 if (errval) {
1944 dput(s->s_root);
1945 s->s_root = NULL;
1946 goto error;
1947 }
1948 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1949
1950 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1951 set_sb_fs_state(rs, 0);
1952
1953 /* Clear out s_bmap_nr if it would wrap. We can handle this
1954 * case, but older revisions can't. This will cause the
1955 * file system to fail mount on those older implementations,
1956 * avoiding corruption. -jeffm */
1957 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1958 sb_bmap_nr(rs) != 0) {
1959 reiserfs_warning(s, "super-2030", "This file system "
1960 "claims to use %u bitmap blocks in "
1961 "its super block, but requires %u. "
1962 "Clearing to zero.", sb_bmap_nr(rs),
1963 reiserfs_bmap_count(s));
1964
1965 set_sb_bmap_nr(rs, 0);
1966 }
1967
1968 if (old_format_only(s)) {
1969 /* filesystem of format 3.5 either with standard or non-standard
1970 journal */
1971 if (convert_reiserfs(s)) {
1972 /* and -o conv is given */
1973 if (!silent)
1974 reiserfs_info(s,
1975 "converting 3.5 filesystem to the 3.6 format");
1976
1977 if (is_reiserfs_3_5(rs))
1978 /* put magic string of 3.6 format. 2.2 will not be able to
1979 mount this filesystem anymore */
1980 memcpy(rs->s_v1.s_magic,
1981 reiserfs_3_6_magic_string,
1982 sizeof
1983 (reiserfs_3_6_magic_string));
1984
1985 set_sb_version(rs, REISERFS_VERSION_2);
1986 reiserfs_convert_objectid_map_v1(s);
1987 set_bit(REISERFS_3_6, &(sbi->s_properties));
1988 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1989 } else if (!silent) {
1990 reiserfs_info(s, "using 3.5.x disk format\n");
1991 }
1992 } else
1993 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1994
1995
1996 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1997 errval = journal_end(&th, s, 1);
1998 if (errval) {
1999 dput(s->s_root);
2000 s->s_root = NULL;
2001 goto error;
2002 }
2003
2004 if ((errval = reiserfs_lookup_privroot(s)) ||
2005 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2006 dput(s->s_root);
2007 s->s_root = NULL;
2008 goto error;
2009 }
2010
2011 /* look for files which were to be removed in previous session */
2012 finish_unfinished(s);
2013 } else {
2014 if (old_format_only(s) && !silent) {
2015 reiserfs_info(s, "using 3.5.x disk format\n");
2016 }
2017
2018 if ((errval = reiserfs_lookup_privroot(s)) ||
2019 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2020 dput(s->s_root);
2021 s->s_root = NULL;
2022 goto error;
2023 }
2024 }
2025 // mark hash in super block: it could be unset. overwrite should be ok
2026 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2027
2028 handle_attrs(s);
2029
2030 reiserfs_proc_info_init(s);
2031
2032 init_waitqueue_head(&(sbi->s_wait));
2033 spin_lock_init(&sbi->bitmap_lock);
2034
2035 reiserfs_write_unlock(s);
2036
2037 return (0);
2038
2039 error:
2040 reiserfs_write_unlock(s);
2041
2042 error_unlocked:
2043 /* kill the commit thread, free journal ram */
2044 if (jinit_done) {
2045 reiserfs_write_lock(s);
2046 journal_release_error(NULL, s);
2047 reiserfs_write_unlock(s);
2048 }
2049
2050 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2051
2052 reiserfs_free_bitmap_cache(s);
2053 if (SB_BUFFER_WITH_SB(s))
2054 brelse(SB_BUFFER_WITH_SB(s));
2055 #ifdef CONFIG_QUOTA
2056 {
2057 int j;
2058 for (j = 0; j < MAXQUOTAS; j++)
2059 kfree(qf_names[j]);
2060 }
2061 #endif
2062 kfree(sbi);
2063
2064 s->s_fs_info = NULL;
2065 return errval;
2066 }
2067
2068 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2069 {
2070 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2071
2072 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2073 buf->f_bfree = sb_free_blocks(rs);
2074 buf->f_bavail = buf->f_bfree;
2075 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2076 buf->f_bsize = dentry->d_sb->s_blocksize;
2077 /* changed to accommodate gcc folks. */
2078 buf->f_type = REISERFS_SUPER_MAGIC;
2079 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2080 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2081 sizeof(rs->s_uuid)/2);
2082
2083 return 0;
2084 }
2085
2086 #ifdef CONFIG_QUOTA
2087 static int reiserfs_write_dquot(struct dquot *dquot)
2088 {
2089 struct reiserfs_transaction_handle th;
2090 int ret, err;
2091
2092 reiserfs_write_lock(dquot->dq_sb);
2093 ret =
2094 journal_begin(&th, dquot->dq_sb,
2095 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2096 if (ret)
2097 goto out;
2098 ret = dquot_commit(dquot);
2099 err =
2100 journal_end(&th, dquot->dq_sb,
2101 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2102 if (!ret && err)
2103 ret = err;
2104 out:
2105 reiserfs_write_unlock(dquot->dq_sb);
2106 return ret;
2107 }
2108
2109 static int reiserfs_acquire_dquot(struct dquot *dquot)
2110 {
2111 struct reiserfs_transaction_handle th;
2112 int ret, err;
2113
2114 reiserfs_write_lock(dquot->dq_sb);
2115 ret =
2116 journal_begin(&th, dquot->dq_sb,
2117 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2118 if (ret)
2119 goto out;
2120 ret = dquot_acquire(dquot);
2121 err =
2122 journal_end(&th, dquot->dq_sb,
2123 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2124 if (!ret && err)
2125 ret = err;
2126 out:
2127 reiserfs_write_unlock(dquot->dq_sb);
2128 return ret;
2129 }
2130
2131 static int reiserfs_release_dquot(struct dquot *dquot)
2132 {
2133 struct reiserfs_transaction_handle th;
2134 int ret, err;
2135
2136 reiserfs_write_lock(dquot->dq_sb);
2137 ret =
2138 journal_begin(&th, dquot->dq_sb,
2139 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2140 if (ret) {
2141 /* Release dquot anyway to avoid endless cycle in dqput() */
2142 dquot_release(dquot);
2143 goto out;
2144 }
2145 ret = dquot_release(dquot);
2146 err =
2147 journal_end(&th, dquot->dq_sb,
2148 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2149 if (!ret && err)
2150 ret = err;
2151 out:
2152 reiserfs_write_unlock(dquot->dq_sb);
2153 return ret;
2154 }
2155
2156 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2157 {
2158 /* Are we journaling quotas? */
2159 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2160 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2161 dquot_mark_dquot_dirty(dquot);
2162 return reiserfs_write_dquot(dquot);
2163 } else
2164 return dquot_mark_dquot_dirty(dquot);
2165 }
2166
2167 static int reiserfs_write_info(struct super_block *sb, int type)
2168 {
2169 struct reiserfs_transaction_handle th;
2170 int ret, err;
2171
2172 /* Data block + inode block */
2173 reiserfs_write_lock(sb);
2174 ret = journal_begin(&th, sb, 2);
2175 if (ret)
2176 goto out;
2177 ret = dquot_commit_info(sb, type);
2178 err = journal_end(&th, sb, 2);
2179 if (!ret && err)
2180 ret = err;
2181 out:
2182 reiserfs_write_unlock(sb);
2183 return ret;
2184 }
2185
2186 /*
2187 * Turn on quotas during mount time - we need to find the quota file and such...
2188 */
2189 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2190 {
2191 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2192 REISERFS_SB(sb)->s_jquota_fmt, type);
2193 }
2194
2195 /*
2196 * Standard function to be called on quota_on
2197 */
2198 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2199 struct path *path)
2200 {
2201 int err;
2202 struct inode *inode;
2203 struct reiserfs_transaction_handle th;
2204 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2205
2206 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
2207 return -EINVAL;
2208
2209 /* Quotafile not on the same filesystem? */
2210 if (path->dentry->d_sb != sb) {
2211 err = -EXDEV;
2212 goto out;
2213 }
2214 inode = path->dentry->d_inode;
2215 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2216 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2217 err = reiserfs_unpack(inode, NULL);
2218 if (err) {
2219 reiserfs_warning(sb, "super-6520",
2220 "Unpacking tail of quota file failed"
2221 " (%d). Cannot turn on quotas.", err);
2222 err = -EINVAL;
2223 goto out;
2224 }
2225 mark_inode_dirty(inode);
2226 }
2227 /* Journaling quota? */
2228 if (REISERFS_SB(sb)->s_qf_names[type]) {
2229 /* Quotafile not of fs root? */
2230 if (path->dentry->d_parent != sb->s_root)
2231 reiserfs_warning(sb, "super-6521",
2232 "Quota file not on filesystem root. "
2233 "Journalled quota will not work.");
2234 }
2235
2236 /*
2237 * When we journal data on quota file, we have to flush journal to see
2238 * all updates to the file when we bypass pagecache...
2239 */
2240 if (reiserfs_file_data_log(inode)) {
2241 /* Just start temporary transaction and finish it */
2242 err = journal_begin(&th, sb, 1);
2243 if (err)
2244 goto out;
2245 err = journal_end_sync(&th, sb, 1);
2246 if (err)
2247 goto out;
2248 }
2249 err = dquot_quota_on(sb, type, format_id, path);
2250 out:
2251 return err;
2252 }
2253
2254 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2255 * acquiring the locks... As quota files are never truncated and quota code
2256 * itself serializes the operations (and no one else should touch the files)
2257 * we don't have to be afraid of races */
2258 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2259 size_t len, loff_t off)
2260 {
2261 struct inode *inode = sb_dqopt(sb)->files[type];
2262 unsigned long blk = off >> sb->s_blocksize_bits;
2263 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2264 size_t toread;
2265 struct buffer_head tmp_bh, *bh;
2266 loff_t i_size = i_size_read(inode);
2267
2268 if (off > i_size)
2269 return 0;
2270 if (off + len > i_size)
2271 len = i_size - off;
2272 toread = len;
2273 while (toread > 0) {
2274 tocopy =
2275 sb->s_blocksize - offset <
2276 toread ? sb->s_blocksize - offset : toread;
2277 tmp_bh.b_state = 0;
2278 /* Quota files are without tails so we can safely use this function */
2279 reiserfs_write_lock(sb);
2280 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2281 reiserfs_write_unlock(sb);
2282 if (err)
2283 return err;
2284 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2285 memset(data, 0, tocopy);
2286 else {
2287 bh = sb_bread(sb, tmp_bh.b_blocknr);
2288 if (!bh)
2289 return -EIO;
2290 memcpy(data, bh->b_data + offset, tocopy);
2291 brelse(bh);
2292 }
2293 offset = 0;
2294 toread -= tocopy;
2295 data += tocopy;
2296 blk++;
2297 }
2298 return len;
2299 }
2300
2301 /* Write to quotafile (we know the transaction is already started and has
2302 * enough credits) */
2303 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2304 const char *data, size_t len, loff_t off)
2305 {
2306 struct inode *inode = sb_dqopt(sb)->files[type];
2307 unsigned long blk = off >> sb->s_blocksize_bits;
2308 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2309 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2310 size_t towrite = len;
2311 struct buffer_head tmp_bh, *bh;
2312
2313 if (!current->journal_info) {
2314 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2315 " cancelled because transaction is not started.\n",
2316 (unsigned long long)off, (unsigned long long)len);
2317 return -EIO;
2318 }
2319 while (towrite > 0) {
2320 tocopy = sb->s_blocksize - offset < towrite ?
2321 sb->s_blocksize - offset : towrite;
2322 tmp_bh.b_state = 0;
2323 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2324 if (err)
2325 goto out;
2326 if (offset || tocopy != sb->s_blocksize)
2327 bh = sb_bread(sb, tmp_bh.b_blocknr);
2328 else
2329 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2330 if (!bh) {
2331 err = -EIO;
2332 goto out;
2333 }
2334 lock_buffer(bh);
2335 memcpy(bh->b_data + offset, data, tocopy);
2336 flush_dcache_page(bh->b_page);
2337 set_buffer_uptodate(bh);
2338 unlock_buffer(bh);
2339 reiserfs_prepare_for_journal(sb, bh, 1);
2340 journal_mark_dirty(current->journal_info, sb, bh);
2341 if (!journal_quota)
2342 reiserfs_add_ordered_list(inode, bh);
2343 brelse(bh);
2344 offset = 0;
2345 towrite -= tocopy;
2346 data += tocopy;
2347 blk++;
2348 }
2349 out:
2350 if (len == towrite)
2351 return err;
2352 if (inode->i_size < off + len - towrite)
2353 i_size_write(inode, off + len - towrite);
2354 inode->i_version++;
2355 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2356 mark_inode_dirty(inode);
2357 return len - towrite;
2358 }
2359
2360 #endif
2361
2362 static struct dentry *get_super_block(struct file_system_type *fs_type,
2363 int flags, const char *dev_name,
2364 void *data)
2365 {
2366 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2367 }
2368
2369 static int __init init_reiserfs_fs(void)
2370 {
2371 int ret;
2372
2373 if ((ret = init_inodecache())) {
2374 return ret;
2375 }
2376
2377 reiserfs_proc_info_global_init();
2378
2379 ret = register_filesystem(&reiserfs_fs_type);
2380
2381 if (ret == 0) {
2382 return 0;
2383 }
2384
2385 reiserfs_proc_info_global_done();
2386 destroy_inodecache();
2387
2388 return ret;
2389 }
2390
2391 static void __exit exit_reiserfs_fs(void)
2392 {
2393 reiserfs_proc_info_global_done();
2394 unregister_filesystem(&reiserfs_fs_type);
2395 destroy_inodecache();
2396 }
2397
2398 struct file_system_type reiserfs_fs_type = {
2399 .owner = THIS_MODULE,
2400 .name = "reiserfs",
2401 .mount = get_super_block,
2402 .kill_sb = reiserfs_kill_sb,
2403 .fs_flags = FS_REQUIRES_DEV,
2404 };
2405
2406 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2407 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2408 MODULE_LICENSE("GPL");
2409
2410 module_init(init_reiserfs_fs);
2411 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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