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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / fs / reiserfs / super.c
blob2c803353f8ac4f70099f7cef6a590c46556c21d6
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 int depth;
247 retval = search_item(s, &max_cpu_key, &path);
248 if (retval != ITEM_NOT_FOUND) {
249 reiserfs_error(s, "vs-2140",
250 "search_by_key returned %d", retval);
251 break;
252 }
253
254 bh = get_last_bh(&path);
255 item_pos = get_item_pos(&path);
256 if (item_pos != B_NR_ITEMS(bh)) {
257 reiserfs_warning(s, "vs-2060",
258 "wrong position found");
259 break;
260 }
261 item_pos--;
262 ih = B_N_PITEM_HEAD(bh, item_pos);
263
264 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
265 /* there are no "save" links anymore */
266 break;
267
268 save_link_key = ih->ih_key;
269 if (is_indirect_le_ih(ih))
270 truncate = 1;
271 else
272 truncate = 0;
273
274 /* reiserfs_iget needs k_dirid and k_objectid only */
275 item = B_I_PITEM(bh, ih);
276 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
277 obj_key.on_disk_key.k_objectid =
278 le32_to_cpu(ih->ih_key.k_objectid);
279 obj_key.on_disk_key.k_offset = 0;
280 obj_key.on_disk_key.k_type = 0;
281
282 pathrelse(&path);
283
284 inode = reiserfs_iget(s, &obj_key);
285 if (!inode) {
286 /* the unlink almost completed, it just did not manage to remove
287 "save" link and release objectid */
288 reiserfs_warning(s, "vs-2180", "iget failed for %K",
289 &obj_key);
290 retval = remove_save_link_only(s, &save_link_key, 1);
291 continue;
292 }
293
294 if (!truncate && inode->i_nlink) {
295 /* file is not unlinked */
296 reiserfs_warning(s, "vs-2185",
297 "file %K is not unlinked",
298 &obj_key);
299 retval = remove_save_link_only(s, &save_link_key, 0);
300 continue;
301 }
302 depth = reiserfs_write_unlock_nested(inode->i_sb);
303 dquot_initialize(inode);
304 reiserfs_write_lock_nested(inode->i_sb, depth);
305
306 if (truncate && S_ISDIR(inode->i_mode)) {
307 /* We got a truncate request for a dir which is impossible.
308 The only imaginable way is to execute unfinished truncate request
309 then boot into old kernel, remove the file and create dir with
310 the same key. */
311 reiserfs_warning(s, "green-2101",
312 "impossible truncate on a "
313 "directory %k. Please report",
314 INODE_PKEY(inode));
315 retval = remove_save_link_only(s, &save_link_key, 0);
316 truncate = 0;
317 iput(inode);
318 continue;
319 }
320
321 if (truncate) {
322 REISERFS_I(inode)->i_flags |=
323 i_link_saved_truncate_mask;
324 /* not completed truncate found. New size was committed together
325 with "save" link */
326 reiserfs_info(s, "Truncating %k to %Ld ..",
327 INODE_PKEY(inode), inode->i_size);
328 reiserfs_truncate_file(inode,
329 0
330 /*don't update modification time */
331 );
332 retval = remove_save_link(inode, truncate);
333 } else {
334 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
335 /* not completed unlink (rmdir) found */
336 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
337 if (memcmp(&last_inode_key, INODE_PKEY(inode),
338 sizeof(last_inode_key))){
339 last_inode_key = *INODE_PKEY(inode);
340 /* removal gets completed in iput */
341 retval = 0;
342 } else {
343 reiserfs_warning(s, "super-2189", "Dead loop "
344 "in finish_unfinished "
345 "detected, just remove "
346 "save link\n");
347 retval = remove_save_link_only(s,
348 &save_link_key, 0);
349 }
350 }
351
352 iput(inode);
353 printk("done\n");
354 done++;
355 }
356 REISERFS_SB(s)->s_is_unlinked_ok = 0;
357
358 #ifdef CONFIG_QUOTA
359 /* Turn quotas off */
360 reiserfs_write_unlock(s);
361 for (i = 0; i < MAXQUOTAS; i++) {
362 if (sb_dqopt(s)->files[i] && quota_enabled[i])
363 dquot_quota_off(s, i);
364 }
365 reiserfs_write_lock(s);
366 if (ms_active_set)
367 /* Restore the flag back */
368 s->s_flags &= ~MS_ACTIVE;
369 #endif
370 pathrelse(&path);
371 if (done)
372 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
373 "Completed\n", done);
374 return retval;
375 }
376
377 /* to protect file being unlinked from getting lost we "safe" link files
378 being unlinked. This link will be deleted in the same transaction with last
379 item of file. mounting the filesystem we scan all these links and remove
380 files which almost got lost */
381 void add_save_link(struct reiserfs_transaction_handle *th,
382 struct inode *inode, int truncate)
383 {
384 INITIALIZE_PATH(path);
385 int retval;
386 struct cpu_key key;
387 struct item_head ih;
388 __le32 link;
389
390 BUG_ON(!th->t_trans_id);
391
392 /* file can only get one "save link" of each kind */
393 RFALSE(truncate &&
394 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
395 "saved link already exists for truncated inode %lx",
396 (long)inode->i_ino);
397 RFALSE(!truncate &&
398 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
399 "saved link already exists for unlinked inode %lx",
400 (long)inode->i_ino);
401
402 /* setup key of "save" link */
403 key.version = KEY_FORMAT_3_5;
404 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
405 key.on_disk_key.k_objectid = inode->i_ino;
406 if (!truncate) {
407 /* unlink, rmdir, rename */
408 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
409 set_cpu_key_k_type(&key, TYPE_DIRECT);
410
411 /* item head of "safe" link */
412 make_le_item_head(&ih, &key, key.version,
413 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
414 4 /*length */ , 0xffff /*free space */ );
415 } else {
416 /* truncate */
417 if (S_ISDIR(inode->i_mode))
418 reiserfs_warning(inode->i_sb, "green-2102",
419 "Adding a truncate savelink for "
420 "a directory %k! Please report",
421 INODE_PKEY(inode));
422 set_cpu_key_k_offset(&key, 1);
423 set_cpu_key_k_type(&key, TYPE_INDIRECT);
424
425 /* item head of "safe" link */
426 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
427 4 /*length */ , 0 /*free space */ );
428 }
429 key.key_length = 3;
430
431 /* look for its place in the tree */
432 retval = search_item(inode->i_sb, &key, &path);
433 if (retval != ITEM_NOT_FOUND) {
434 if (retval != -ENOSPC)
435 reiserfs_error(inode->i_sb, "vs-2100",
436 "search_by_key (%K) returned %d", &key,
437 retval);
438 pathrelse(&path);
439 return;
440 }
441
442 /* body of "save" link */
443 link = INODE_PKEY(inode)->k_dir_id;
444
445 /* put "save" link into tree, don't charge quota to anyone */
446 retval =
447 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
448 if (retval) {
449 if (retval != -ENOSPC)
450 reiserfs_error(inode->i_sb, "vs-2120",
451 "insert_item returned %d", retval);
452 } else {
453 if (truncate)
454 REISERFS_I(inode)->i_flags |=
455 i_link_saved_truncate_mask;
456 else
457 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
458 }
459 }
460
461 /* this opens transaction unlike add_save_link */
462 int remove_save_link(struct inode *inode, int truncate)
463 {
464 struct reiserfs_transaction_handle th;
465 struct reiserfs_key key;
466 int err;
467
468 /* we are going to do one balancing only */
469 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
470 if (err)
471 return err;
472
473 /* setup key of "save" link */
474 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
475 key.k_objectid = INODE_PKEY(inode)->k_objectid;
476 if (!truncate) {
477 /* unlink, rmdir, rename */
478 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
479 1 + inode->i_sb->s_blocksize);
480 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
481 } else {
482 /* truncate */
483 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
484 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
485 }
486
487 if ((truncate &&
488 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
489 (!truncate &&
490 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
491 /* don't take quota bytes from anywhere */
492 reiserfs_delete_solid_item(&th, NULL, &key);
493 if (!truncate) {
494 reiserfs_release_objectid(&th, inode->i_ino);
495 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
496 } else
497 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
498
499 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
500 }
501
502 static void reiserfs_kill_sb(struct super_block *s)
503 {
504 if (REISERFS_SB(s)) {
505 reiserfs_proc_info_done(s);
506 /*
507 * Force any pending inode evictions to occur now. Any
508 * inodes to be removed that have extended attributes
509 * associated with them need to clean them up before
510 * we can release the extended attribute root dentries.
511 * shrink_dcache_for_umount will BUG if we don't release
512 * those before it's called so ->put_super is too late.
513 */
514 shrink_dcache_sb(s);
515
516 dput(REISERFS_SB(s)->xattr_root);
517 REISERFS_SB(s)->xattr_root = NULL;
518 dput(REISERFS_SB(s)->priv_root);
519 REISERFS_SB(s)->priv_root = NULL;
520 }
521
522 kill_block_super(s);
523 }
524
525 static void reiserfs_put_super(struct super_block *s)
526 {
527 struct reiserfs_transaction_handle th;
528 th.t_trans_id = 0;
529
530 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
531
532 reiserfs_write_lock(s);
533
534 /* change file system state to current state if it was mounted with read-write permissions */
535 if (!(s->s_flags & MS_RDONLY)) {
536 if (!journal_begin(&th, s, 10)) {
537 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
538 1);
539 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
540 REISERFS_SB(s)->s_mount_state);
541 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
542 }
543 }
544
545 /* note, journal_release checks for readonly mount, and can decide not
546 ** to do a journal_end
547 */
548 journal_release(&th, s);
549
550 reiserfs_free_bitmap_cache(s);
551
552 brelse(SB_BUFFER_WITH_SB(s));
553
554 print_statistics(s);
555
556 if (REISERFS_SB(s)->reserved_blocks != 0) {
557 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
558 REISERFS_SB(s)->reserved_blocks);
559 }
560
561 reiserfs_write_unlock(s);
562 mutex_destroy(&REISERFS_SB(s)->lock);
563 kfree(s->s_fs_info);
564 s->s_fs_info = NULL;
565 }
566
567 static struct kmem_cache *reiserfs_inode_cachep;
568
569 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
570 {
571 struct reiserfs_inode_info *ei;
572 ei = (struct reiserfs_inode_info *)
573 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
574 if (!ei)
575 return NULL;
576 atomic_set(&ei->openers, 0);
577 mutex_init(&ei->tailpack);
578 return &ei->vfs_inode;
579 }
580
581 static void reiserfs_i_callback(struct rcu_head *head)
582 {
583 struct inode *inode = container_of(head, struct inode, i_rcu);
584 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
585 }
586
587 static void reiserfs_destroy_inode(struct inode *inode)
588 {
589 call_rcu(&inode->i_rcu, reiserfs_i_callback);
590 }
591
592 static void init_once(void *foo)
593 {
594 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
595
596 INIT_LIST_HEAD(&ei->i_prealloc_list);
597 inode_init_once(&ei->vfs_inode);
598 }
599
600 static int init_inodecache(void)
601 {
602 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
603 sizeof(struct
604 reiserfs_inode_info),
605 0, (SLAB_RECLAIM_ACCOUNT|
606 SLAB_MEM_SPREAD),
607 init_once);
608 if (reiserfs_inode_cachep == NULL)
609 return -ENOMEM;
610 return 0;
611 }
612
613 static void destroy_inodecache(void)
614 {
615 /*
616 * Make sure all delayed rcu free inodes are flushed before we
617 * destroy cache.
618 */
619 rcu_barrier();
620 kmem_cache_destroy(reiserfs_inode_cachep);
621 }
622
623 /* we don't mark inodes dirty, we just log them */
624 static void reiserfs_dirty_inode(struct inode *inode, int flags)
625 {
626 struct reiserfs_transaction_handle th;
627
628 int err = 0;
629
630 if (inode->i_sb->s_flags & MS_RDONLY) {
631 reiserfs_warning(inode->i_sb, "clm-6006",
632 "writing inode %lu on readonly FS",
633 inode->i_ino);
634 return;
635 }
636 reiserfs_write_lock(inode->i_sb);
637
638 /* this is really only used for atime updates, so they don't have
639 ** to be included in O_SYNC or fsync
640 */
641 err = journal_begin(&th, inode->i_sb, 1);
642 if (err)
643 goto out;
644
645 reiserfs_update_sd(&th, inode);
646 journal_end(&th, inode->i_sb, 1);
647
648 out:
649 reiserfs_write_unlock(inode->i_sb);
650 }
651
652 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
653 {
654 struct super_block *s = root->d_sb;
655 struct reiserfs_journal *journal = SB_JOURNAL(s);
656 long opts = REISERFS_SB(s)->s_mount_opt;
657
658 if (opts & (1 << REISERFS_LARGETAIL))
659 seq_puts(seq, ",tails=on");
660 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
661 seq_puts(seq, ",notail");
662 /* tails=small is default so we don't show it */
663
664 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
665 seq_puts(seq, ",barrier=none");
666 /* barrier=flush is default so we don't show it */
667
668 if (opts & (1 << REISERFS_ERROR_CONTINUE))
669 seq_puts(seq, ",errors=continue");
670 else if (opts & (1 << REISERFS_ERROR_PANIC))
671 seq_puts(seq, ",errors=panic");
672 /* errors=ro is default so we don't show it */
673
674 if (opts & (1 << REISERFS_DATA_LOG))
675 seq_puts(seq, ",data=journal");
676 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
677 seq_puts(seq, ",data=writeback");
678 /* data=ordered is default so we don't show it */
679
680 if (opts & (1 << REISERFS_ATTRS))
681 seq_puts(seq, ",attrs");
682
683 if (opts & (1 << REISERFS_XATTRS_USER))
684 seq_puts(seq, ",user_xattr");
685
686 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
687 seq_puts(seq, ",expose_privroot");
688
689 if (opts & (1 << REISERFS_POSIXACL))
690 seq_puts(seq, ",acl");
691
692 if (REISERFS_SB(s)->s_jdev)
693 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
694
695 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
696 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
697
698 #ifdef CONFIG_QUOTA
699 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
700 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
701 else if (opts & (1 << REISERFS_USRQUOTA))
702 seq_puts(seq, ",usrquota");
703 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
704 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
705 else if (opts & (1 << REISERFS_GRPQUOTA))
706 seq_puts(seq, ",grpquota");
707 if (REISERFS_SB(s)->s_jquota_fmt) {
708 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
709 seq_puts(seq, ",jqfmt=vfsold");
710 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
711 seq_puts(seq, ",jqfmt=vfsv0");
712 }
713 #endif
714
715 /* Block allocator options */
716 if (opts & (1 << REISERFS_NO_BORDER))
717 seq_puts(seq, ",block-allocator=noborder");
718 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
719 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
720 if (opts & (1 << REISERFS_HASHED_RELOCATION))
721 seq_puts(seq, ",block-allocator=hashed_relocation");
722 if (opts & (1 << REISERFS_TEST4))
723 seq_puts(seq, ",block-allocator=test4");
724 show_alloc_options(seq, s);
725 return 0;
726 }
727
728 #ifdef CONFIG_QUOTA
729 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
730 size_t, loff_t);
731 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
732 loff_t);
733 #endif
734
735 static const struct super_operations reiserfs_sops = {
736 .alloc_inode = reiserfs_alloc_inode,
737 .destroy_inode = reiserfs_destroy_inode,
738 .write_inode = reiserfs_write_inode,
739 .dirty_inode = reiserfs_dirty_inode,
740 .evict_inode = reiserfs_evict_inode,
741 .put_super = reiserfs_put_super,
742 .sync_fs = reiserfs_sync_fs,
743 .freeze_fs = reiserfs_freeze,
744 .unfreeze_fs = reiserfs_unfreeze,
745 .statfs = reiserfs_statfs,
746 .remount_fs = reiserfs_remount,
747 .show_options = reiserfs_show_options,
748 #ifdef CONFIG_QUOTA
749 .quota_read = reiserfs_quota_read,
750 .quota_write = reiserfs_quota_write,
751 #endif
752 };
753
754 #ifdef CONFIG_QUOTA
755 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
756
757 static int reiserfs_write_dquot(struct dquot *);
758 static int reiserfs_acquire_dquot(struct dquot *);
759 static int reiserfs_release_dquot(struct dquot *);
760 static int reiserfs_mark_dquot_dirty(struct dquot *);
761 static int reiserfs_write_info(struct super_block *, int);
762 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
763
764 static const struct dquot_operations reiserfs_quota_operations = {
765 .write_dquot = reiserfs_write_dquot,
766 .acquire_dquot = reiserfs_acquire_dquot,
767 .release_dquot = reiserfs_release_dquot,
768 .mark_dirty = reiserfs_mark_dquot_dirty,
769 .write_info = reiserfs_write_info,
770 .alloc_dquot = dquot_alloc,
771 .destroy_dquot = dquot_destroy,
772 };
773
774 static const struct quotactl_ops reiserfs_qctl_operations = {
775 .quota_on = reiserfs_quota_on,
776 .quota_off = dquot_quota_off,
777 .quota_sync = dquot_quota_sync,
778 .get_info = dquot_get_dqinfo,
779 .set_info = dquot_set_dqinfo,
780 .get_dqblk = dquot_get_dqblk,
781 .set_dqblk = dquot_set_dqblk,
782 };
783 #endif
784
785 static const struct export_operations reiserfs_export_ops = {
786 .encode_fh = reiserfs_encode_fh,
787 .fh_to_dentry = reiserfs_fh_to_dentry,
788 .fh_to_parent = reiserfs_fh_to_parent,
789 .get_parent = reiserfs_get_parent,
790 };
791
792 /* this struct is used in reiserfs_getopt () for containing the value for those
793 mount options that have values rather than being toggles. */
794 typedef struct {
795 char *value;
796 int setmask; /* bitmask which is to set on mount_options bitmask when this
797 value is found, 0 is no bits are to be changed. */
798 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
799 value is found, 0 is no bits are to be changed. This is
800 applied BEFORE setmask */
801 } arg_desc_t;
802
803 /* Set this bit in arg_required to allow empty arguments */
804 #define REISERFS_OPT_ALLOWEMPTY 31
805
806 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
807 mount options */
808 typedef struct {
809 char *option_name;
810 int arg_required; /* 0 if argument is not required, not 0 otherwise */
811 const arg_desc_t *values; /* list of values accepted by an option */
812 int setmask; /* bitmask which is to set on mount_options bitmask when this
813 value is found, 0 is no bits are to be changed. */
814 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
815 value is found, 0 is no bits are to be changed. This is
816 applied BEFORE setmask */
817 } opt_desc_t;
818
819 /* possible values for -o data= */
820 static const arg_desc_t logging_mode[] = {
821 {"ordered", 1 << REISERFS_DATA_ORDERED,
822 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
823 {"journal", 1 << REISERFS_DATA_LOG,
824 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
825 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
826 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
827 {.value = NULL}
828 };
829
830 /* possible values for -o barrier= */
831 static const arg_desc_t barrier_mode[] = {
832 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
833 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
834 {.value = NULL}
835 };
836
837 /* possible values for "-o block-allocator=" and bits which are to be set in
838 s_mount_opt of reiserfs specific part of in-core super block */
839 static const arg_desc_t balloc[] = {
840 {"noborder", 1 << REISERFS_NO_BORDER, 0},
841 {"border", 0, 1 << REISERFS_NO_BORDER},
842 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
843 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
844 {"test4", 1 << REISERFS_TEST4, 0},
845 {"notest4", 0, 1 << REISERFS_TEST4},
846 {NULL, 0, 0}
847 };
848
849 static const arg_desc_t tails[] = {
850 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
851 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
852 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
853 {NULL, 0, 0}
854 };
855
856 static const arg_desc_t error_actions[] = {
857 {"panic", 1 << REISERFS_ERROR_PANIC,
858 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
859 {"ro-remount", 1 << REISERFS_ERROR_RO,
860 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
861 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
862 {"continue", 1 << REISERFS_ERROR_CONTINUE,
863 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
864 #endif
865 {NULL, 0, 0},
866 };
867
868 /* proceed only one option from a list *cur - string containing of mount options
869 opts - array of options which are accepted
870 opt_arg - if option is found and requires an argument and if it is specifed
871 in the input - pointer to the argument is stored here
872 bit_flags - if option requires to set a certain bit - it is set here
873 return -1 if unknown option is found, opt->arg_required otherwise */
874 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
875 char **opt_arg, unsigned long *bit_flags)
876 {
877 char *p;
878 /* foo=bar,
879 ^ ^ ^
880 | | +-- option_end
881 | +-- arg_start
882 +-- option_start
883 */
884 const opt_desc_t *opt;
885 const arg_desc_t *arg;
886
887 p = *cur;
888
889 /* assume argument cannot contain commas */
890 *cur = strchr(p, ',');
891 if (*cur) {
892 *(*cur) = '\0';
893 (*cur)++;
894 }
895
896 if (!strncmp(p, "alloc=", 6)) {
897 /* Ugly special case, probably we should redo options parser so that
898 it can understand several arguments for some options, also so that
899 it can fill several bitfields with option values. */
900 if (reiserfs_parse_alloc_options(s, p + 6)) {
901 return -1;
902 } else {
903 return 0;
904 }
905 }
906
907 /* for every option in the list */
908 for (opt = opts; opt->option_name; opt++) {
909 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
910 if (bit_flags) {
911 if (opt->clrmask ==
912 (1 << REISERFS_UNSUPPORTED_OPT))
913 reiserfs_warning(s, "super-6500",
914 "%s not supported.\n",
915 p);
916 else
917 *bit_flags &= ~opt->clrmask;
918 if (opt->setmask ==
919 (1 << REISERFS_UNSUPPORTED_OPT))
920 reiserfs_warning(s, "super-6501",
921 "%s not supported.\n",
922 p);
923 else
924 *bit_flags |= opt->setmask;
925 }
926 break;
927 }
928 }
929 if (!opt->option_name) {
930 reiserfs_warning(s, "super-6502",
931 "unknown mount option \"%s\"", p);
932 return -1;
933 }
934
935 p += strlen(opt->option_name);
936 switch (*p) {
937 case '=':
938 if (!opt->arg_required) {
939 reiserfs_warning(s, "super-6503",
940 "the option \"%s\" does not "
941 "require an argument\n",
942 opt->option_name);
943 return -1;
944 }
945 break;
946
947 case 0:
948 if (opt->arg_required) {
949 reiserfs_warning(s, "super-6504",
950 "the option \"%s\" requires an "
951 "argument\n", opt->option_name);
952 return -1;
953 }
954 break;
955 default:
956 reiserfs_warning(s, "super-6505",
957 "head of option \"%s\" is only correct\n",
958 opt->option_name);
959 return -1;
960 }
961
962 /* move to the argument, or to next option if argument is not required */
963 p++;
964
965 if (opt->arg_required
966 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
967 && !strlen(p)) {
968 /* this catches "option=," if not allowed */
969 reiserfs_warning(s, "super-6506",
970 "empty argument for \"%s\"\n",
971 opt->option_name);
972 return -1;
973 }
974
975 if (!opt->values) {
976 /* *=NULLopt_arg contains pointer to argument */
977 *opt_arg = p;
978 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
979 }
980
981 /* values possible for this option are listed in opt->values */
982 for (arg = opt->values; arg->value; arg++) {
983 if (!strcmp(p, arg->value)) {
984 if (bit_flags) {
985 *bit_flags &= ~arg->clrmask;
986 *bit_flags |= arg->setmask;
987 }
988 return opt->arg_required;
989 }
990 }
991
992 reiserfs_warning(s, "super-6506",
993 "bad value \"%s\" for option \"%s\"\n", p,
994 opt->option_name);
995 return -1;
996 }
997
998 /* returns 0 if something is wrong in option string, 1 - otherwise */
999 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
1000 unsigned long *mount_options,
1001 /* after the parsing phase, contains the
1002 collection of bitflags defining what
1003 mount options were selected. */
1004 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
1005 char **jdev_name,
1006 unsigned int *commit_max_age,
1007 char **qf_names,
1008 unsigned int *qfmt)
1009 {
1010 int c;
1011 char *arg = NULL;
1012 char *pos;
1013 opt_desc_t opts[] = {
1014 /* Compatibility stuff, so that -o notail for old setups still work */
1015 {"tails",.arg_required = 't',.values = tails},
1016 {"notail",.clrmask =
1017 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1018 {"conv",.setmask = 1 << REISERFS_CONVERT},
1019 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1020 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1021 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1022 #ifdef CONFIG_REISERFS_FS_XATTR
1023 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1024 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1025 #else
1026 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1028 #endif
1029 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1030 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1031 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1032 #else
1033 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1035 #endif
1036 {.option_name = "nolog"},
1037 {"replayonly",.setmask = 1 << REPLAYONLY},
1038 {"block-allocator",.arg_required = 'a',.values = balloc},
1039 {"data",.arg_required = 'd',.values = logging_mode},
1040 {"barrier",.arg_required = 'b',.values = barrier_mode},
1041 {"resize",.arg_required = 'r',.values = NULL},
1042 {"jdev",.arg_required = 'j',.values = NULL},
1043 {"nolargeio",.arg_required = 'w',.values = NULL},
1044 {"commit",.arg_required = 'c',.values = NULL},
1045 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1046 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1047 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1048 {"errors",.arg_required = 'e',.values = error_actions},
1049 {"usrjquota",.arg_required =
1050 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1051 {"grpjquota",.arg_required =
1052 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1053 {"jqfmt",.arg_required = 'f',.values = NULL},
1054 {.option_name = NULL}
1055 };
1056
1057 *blocks = 0;
1058 if (!options || !*options)
1059 /* use default configuration: create tails, journaling on, no
1060 conversion to newest format */
1061 return 1;
1062
1063 for (pos = options; pos;) {
1064 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1065 if (c == -1)
1066 /* wrong option is given */
1067 return 0;
1068
1069 if (c == 'r') {
1070 char *p;
1071
1072 p = NULL;
1073 /* "resize=NNN" or "resize=auto" */
1074
1075 if (!strcmp(arg, "auto")) {
1076 /* From JFS code, to auto-get the size. */
1077 *blocks =
1078 s->s_bdev->bd_inode->i_size >> s->
1079 s_blocksize_bits;
1080 } else {
1081 *blocks = simple_strtoul(arg, &p, 0);
1082 if (*p != '\0') {
1083 /* NNN does not look like a number */
1084 reiserfs_warning(s, "super-6507",
1085 "bad value %s for "
1086 "-oresize\n", arg);
1087 return 0;
1088 }
1089 }
1090 }
1091
1092 if (c == 'c') {
1093 char *p = NULL;
1094 unsigned long val = simple_strtoul(arg, &p, 0);
1095 /* commit=NNN (time in seconds) */
1096 if (*p != '\0' || val >= (unsigned int)-1) {
1097 reiserfs_warning(s, "super-6508",
1098 "bad value %s for -ocommit\n",
1099 arg);
1100 return 0;
1101 }
1102 *commit_max_age = (unsigned int)val;
1103 }
1104
1105 if (c == 'w') {
1106 reiserfs_warning(s, "super-6509", "nolargeio option "
1107 "is no longer supported");
1108 return 0;
1109 }
1110
1111 if (c == 'j') {
1112 if (arg && *arg && jdev_name) {
1113 if (*jdev_name) { //Hm, already assigned?
1114 reiserfs_warning(s, "super-6510",
1115 "journal device was "
1116 "already specified to "
1117 "be %s", *jdev_name);
1118 return 0;
1119 }
1120 *jdev_name = arg;
1121 }
1122 }
1123 #ifdef CONFIG_QUOTA
1124 if (c == 'u' || c == 'g') {
1125 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1126
1127 if (sb_any_quota_loaded(s) &&
1128 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1129 reiserfs_warning(s, "super-6511",
1130 "cannot change journaled "
1131 "quota options when quota "
1132 "turned on.");
1133 return 0;
1134 }
1135 if (*arg) { /* Some filename specified? */
1136 if (REISERFS_SB(s)->s_qf_names[qtype]
1137 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1138 arg)) {
1139 reiserfs_warning(s, "super-6512",
1140 "%s quota file "
1141 "already specified.",
1142 QTYPE2NAME(qtype));
1143 return 0;
1144 }
1145 if (strchr(arg, '/')) {
1146 reiserfs_warning(s, "super-6513",
1147 "quotafile must be "
1148 "on filesystem root.");
1149 return 0;
1150 }
1151 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1152 if (!qf_names[qtype]) {
1153 reiserfs_warning(s, "reiserfs-2502",
1154 "not enough memory "
1155 "for storing "
1156 "quotafile name.");
1157 return 0;
1158 }
1159 if (qtype == USRQUOTA)
1160 *mount_options |= 1 << REISERFS_USRQUOTA;
1161 else
1162 *mount_options |= 1 << REISERFS_GRPQUOTA;
1163 } else {
1164 if (qf_names[qtype] !=
1165 REISERFS_SB(s)->s_qf_names[qtype])
1166 kfree(qf_names[qtype]);
1167 qf_names[qtype] = NULL;
1168 if (qtype == USRQUOTA)
1169 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1170 else
1171 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1172 }
1173 }
1174 if (c == 'f') {
1175 if (!strcmp(arg, "vfsold"))
1176 *qfmt = QFMT_VFS_OLD;
1177 else if (!strcmp(arg, "vfsv0"))
1178 *qfmt = QFMT_VFS_V0;
1179 else {
1180 reiserfs_warning(s, "super-6514",
1181 "unknown quota format "
1182 "specified.");
1183 return 0;
1184 }
1185 if (sb_any_quota_loaded(s) &&
1186 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1187 reiserfs_warning(s, "super-6515",
1188 "cannot change journaled "
1189 "quota options when quota "
1190 "turned on.");
1191 return 0;
1192 }
1193 }
1194 #else
1195 if (c == 'u' || c == 'g' || c == 'f') {
1196 reiserfs_warning(s, "reiserfs-2503", "journaled "
1197 "quota options not supported.");
1198 return 0;
1199 }
1200 #endif
1201 }
1202
1203 #ifdef CONFIG_QUOTA
1204 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1205 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1206 reiserfs_warning(s, "super-6515",
1207 "journaled quota format not specified.");
1208 return 0;
1209 }
1210 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1211 sb_has_quota_loaded(s, USRQUOTA)) ||
1212 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1213 sb_has_quota_loaded(s, GRPQUOTA))) {
1214 reiserfs_warning(s, "super-6516", "quota options must "
1215 "be present when quota is turned on.");
1216 return 0;
1217 }
1218 #endif
1219
1220 return 1;
1221 }
1222
1223 static void switch_data_mode(struct super_block *s, unsigned long mode)
1224 {
1225 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1226 (1 << REISERFS_DATA_ORDERED) |
1227 (1 << REISERFS_DATA_WRITEBACK));
1228 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1229 }
1230
1231 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1232 {
1233 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1234 if (!reiserfs_data_log(s)) {
1235 switch_data_mode(s, REISERFS_DATA_LOG);
1236 reiserfs_info(s, "switching to journaled data mode\n");
1237 }
1238 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1239 if (!reiserfs_data_ordered(s)) {
1240 switch_data_mode(s, REISERFS_DATA_ORDERED);
1241 reiserfs_info(s, "switching to ordered data mode\n");
1242 }
1243 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1244 if (!reiserfs_data_writeback(s)) {
1245 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1246 reiserfs_info(s, "switching to writeback data mode\n");
1247 }
1248 }
1249 }
1250
1251 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1252 {
1253 int flush = (1 << REISERFS_BARRIER_FLUSH);
1254 int none = (1 << REISERFS_BARRIER_NONE);
1255 int all_barrier = flush | none;
1256
1257 if (bits & all_barrier) {
1258 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1259 if (bits & flush) {
1260 REISERFS_SB(s)->s_mount_opt |= flush;
1261 printk("reiserfs: enabling write barrier flush mode\n");
1262 } else if (bits & none) {
1263 REISERFS_SB(s)->s_mount_opt |= none;
1264 printk("reiserfs: write barriers turned off\n");
1265 }
1266 }
1267 }
1268
1269 static void handle_attrs(struct super_block *s)
1270 {
1271 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1272
1273 if (reiserfs_attrs(s)) {
1274 if (old_format_only(s)) {
1275 reiserfs_warning(s, "super-6517", "cannot support "
1276 "attributes on 3.5.x disk format");
1277 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1278 return;
1279 }
1280 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1281 reiserfs_warning(s, "super-6518", "cannot support "
1282 "attributes until flag is set in "
1283 "super-block");
1284 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1285 }
1286 }
1287 }
1288
1289 #ifdef CONFIG_QUOTA
1290 static void handle_quota_files(struct super_block *s, char **qf_names,
1291 unsigned int *qfmt)
1292 {
1293 int i;
1294
1295 for (i = 0; i < MAXQUOTAS; i++) {
1296 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1297 kfree(REISERFS_SB(s)->s_qf_names[i]);
1298 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1299 }
1300 if (*qfmt)
1301 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1302 }
1303 #endif
1304
1305 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1306 {
1307 struct reiserfs_super_block *rs;
1308 struct reiserfs_transaction_handle th;
1309 unsigned long blocks;
1310 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1311 unsigned long safe_mask = 0;
1312 unsigned int commit_max_age = (unsigned int)-1;
1313 struct reiserfs_journal *journal = SB_JOURNAL(s);
1314 char *new_opts = kstrdup(arg, GFP_KERNEL);
1315 int err;
1316 char *qf_names[MAXQUOTAS];
1317 unsigned int qfmt = 0;
1318 #ifdef CONFIG_QUOTA
1319 int i;
1320 #endif
1321
1322 reiserfs_write_lock(s);
1323
1324 #ifdef CONFIG_QUOTA
1325 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1326 #endif
1327
1328 rs = SB_DISK_SUPER_BLOCK(s);
1329
1330 if (!reiserfs_parse_options
1331 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1332 qf_names, &qfmt)) {
1333 #ifdef CONFIG_QUOTA
1334 for (i = 0; i < MAXQUOTAS; i++)
1335 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1336 kfree(qf_names[i]);
1337 #endif
1338 err = -EINVAL;
1339 goto out_err_unlock;
1340 }
1341 #ifdef CONFIG_QUOTA
1342 handle_quota_files(s, qf_names, &qfmt);
1343 #endif
1344
1345 handle_attrs(s);
1346
1347 /* Add options that are safe here */
1348 safe_mask |= 1 << REISERFS_SMALLTAIL;
1349 safe_mask |= 1 << REISERFS_LARGETAIL;
1350 safe_mask |= 1 << REISERFS_NO_BORDER;
1351 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1352 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1353 safe_mask |= 1 << REISERFS_TEST4;
1354 safe_mask |= 1 << REISERFS_ATTRS;
1355 safe_mask |= 1 << REISERFS_XATTRS_USER;
1356 safe_mask |= 1 << REISERFS_POSIXACL;
1357 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1358 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1359 safe_mask |= 1 << REISERFS_ERROR_RO;
1360 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1361 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1362 safe_mask |= 1 << REISERFS_USRQUOTA;
1363 safe_mask |= 1 << REISERFS_GRPQUOTA;
1364
1365 /* Update the bitmask, taking care to keep
1366 * the bits we're not allowed to change here */
1367 REISERFS_SB(s)->s_mount_opt =
1368 (REISERFS_SB(s)->
1369 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1370
1371 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1372 journal->j_max_commit_age = commit_max_age;
1373 journal->j_max_trans_age = commit_max_age;
1374 } else if (commit_max_age == 0) {
1375 /* 0 means restore defaults. */
1376 journal->j_max_commit_age = journal->j_default_max_commit_age;
1377 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1378 }
1379
1380 if (blocks) {
1381 err = reiserfs_resize(s, blocks);
1382 if (err != 0)
1383 goto out_err_unlock;
1384 }
1385
1386 if (*mount_flags & MS_RDONLY) {
1387 reiserfs_write_unlock(s);
1388 reiserfs_xattr_init(s, *mount_flags);
1389 /* remount read-only */
1390 if (s->s_flags & MS_RDONLY)
1391 /* it is read-only already */
1392 goto out_ok_unlocked;
1393
1394 err = dquot_suspend(s, -1);
1395 if (err < 0)
1396 goto out_err;
1397
1398 /* try to remount file system with read-only permissions */
1399 if (sb_umount_state(rs) == REISERFS_VALID_FS
1400 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1401 goto out_ok_unlocked;
1402 }
1403
1404 reiserfs_write_lock(s);
1405
1406 err = journal_begin(&th, s, 10);
1407 if (err)
1408 goto out_err_unlock;
1409
1410 /* Mounting a rw partition read-only. */
1411 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1412 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1413 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1414 } else {
1415 /* remount read-write */
1416 if (!(s->s_flags & MS_RDONLY)) {
1417 reiserfs_write_unlock(s);
1418 reiserfs_xattr_init(s, *mount_flags);
1419 goto out_ok_unlocked; /* We are read-write already */
1420 }
1421
1422 if (reiserfs_is_journal_aborted(journal)) {
1423 err = journal->j_errno;
1424 goto out_err_unlock;
1425 }
1426
1427 handle_data_mode(s, mount_options);
1428 handle_barrier_mode(s, mount_options);
1429 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1430 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1431 err = journal_begin(&th, s, 10);
1432 if (err)
1433 goto out_err_unlock;
1434
1435 /* Mount a partition which is read-only, read-write */
1436 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1437 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1438 s->s_flags &= ~MS_RDONLY;
1439 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1440 if (!old_format_only(s))
1441 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1442 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1443 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1444 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1445 }
1446 /* this will force a full flush of all journal lists */
1447 SB_JOURNAL(s)->j_must_wait = 1;
1448 err = journal_end(&th, s, 10);
1449 if (err)
1450 goto out_err_unlock;
1451
1452 reiserfs_write_unlock(s);
1453 if (!(*mount_flags & MS_RDONLY)) {
1454 dquot_resume(s, -1);
1455 reiserfs_write_lock(s);
1456 finish_unfinished(s);
1457 reiserfs_write_unlock(s);
1458 reiserfs_xattr_init(s, *mount_flags);
1459 }
1460
1461 out_ok_unlocked:
1462 replace_mount_options(s, new_opts);
1463 return 0;
1464
1465 out_err_unlock:
1466 reiserfs_write_unlock(s);
1467 out_err:
1468 kfree(new_opts);
1469 return err;
1470 }
1471
1472 static int read_super_block(struct super_block *s, int offset)
1473 {
1474 struct buffer_head *bh;
1475 struct reiserfs_super_block *rs;
1476 int fs_blocksize;
1477
1478 bh = sb_bread(s, offset / s->s_blocksize);
1479 if (!bh) {
1480 reiserfs_warning(s, "sh-2006",
1481 "bread failed (dev %s, block %lu, size %lu)",
1482 s->s_id, offset / s->s_blocksize,
1483 s->s_blocksize);
1484 return 1;
1485 }
1486
1487 rs = (struct reiserfs_super_block *)bh->b_data;
1488 if (!is_any_reiserfs_magic_string(rs)) {
1489 brelse(bh);
1490 return 1;
1491 }
1492 //
1493 // ok, reiserfs signature (old or new) found in at the given offset
1494 //
1495 fs_blocksize = sb_blocksize(rs);
1496 brelse(bh);
1497 sb_set_blocksize(s, fs_blocksize);
1498
1499 bh = sb_bread(s, offset / s->s_blocksize);
1500 if (!bh) {
1501 reiserfs_warning(s, "sh-2007",
1502 "bread failed (dev %s, block %lu, size %lu)",
1503 s->s_id, offset / s->s_blocksize,
1504 s->s_blocksize);
1505 return 1;
1506 }
1507
1508 rs = (struct reiserfs_super_block *)bh->b_data;
1509 if (sb_blocksize(rs) != s->s_blocksize) {
1510 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1511 "filesystem on (dev %s, block %Lu, size %lu)",
1512 s->s_id,
1513 (unsigned long long)bh->b_blocknr,
1514 s->s_blocksize);
1515 brelse(bh);
1516 return 1;
1517 }
1518
1519 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1520 brelse(bh);
1521 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1522 "--rebuild-tree run detected. Please run\n"
1523 "reiserfsck --rebuild-tree and wait for a "
1524 "completion. If that fails\n"
1525 "get newer reiserfsprogs package");
1526 return 1;
1527 }
1528
1529 SB_BUFFER_WITH_SB(s) = bh;
1530 SB_DISK_SUPER_BLOCK(s) = rs;
1531
1532 if (is_reiserfs_jr(rs)) {
1533 /* magic is of non-standard journal filesystem, look at s_version to
1534 find which format is in use */
1535 if (sb_version(rs) == REISERFS_VERSION_2)
1536 reiserfs_info(s, "found reiserfs format \"3.6\""
1537 " with non-standard journal\n");
1538 else if (sb_version(rs) == REISERFS_VERSION_1)
1539 reiserfs_info(s, "found reiserfs format \"3.5\""
1540 " with non-standard journal\n");
1541 else {
1542 reiserfs_warning(s, "sh-2012", "found unknown "
1543 "format \"%u\" of reiserfs with "
1544 "non-standard magic", sb_version(rs));
1545 return 1;
1546 }
1547 } else
1548 /* s_version of standard format may contain incorrect information,
1549 so we just look at the magic string */
1550 reiserfs_info(s,
1551 "found reiserfs format \"%s\" with standard journal\n",
1552 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1553
1554 s->s_op = &reiserfs_sops;
1555 s->s_export_op = &reiserfs_export_ops;
1556 #ifdef CONFIG_QUOTA
1557 s->s_qcop = &reiserfs_qctl_operations;
1558 s->dq_op = &reiserfs_quota_operations;
1559 #endif
1560
1561 /* new format is limited by the 32 bit wide i_blocks field, want to
1562 ** be one full block below that.
1563 */
1564 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1565 return 0;
1566 }
1567
1568 /* after journal replay, reread all bitmap and super blocks */
1569 static int reread_meta_blocks(struct super_block *s)
1570 {
1571 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1572 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1573 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1574 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1575 return 1;
1576 }
1577
1578 return 0;
1579 }
1580
1581 /////////////////////////////////////////////////////
1582 // hash detection stuff
1583
1584 // if root directory is empty - we set default - Yura's - hash and
1585 // warn about it
1586 // FIXME: we look for only one name in a directory. If tea and yura
1587 // bith have the same value - we ask user to send report to the
1588 // mailing list
1589 static __u32 find_hash_out(struct super_block *s)
1590 {
1591 int retval;
1592 struct inode *inode;
1593 struct cpu_key key;
1594 INITIALIZE_PATH(path);
1595 struct reiserfs_dir_entry de;
1596 __u32 hash = DEFAULT_HASH;
1597
1598 inode = s->s_root->d_inode;
1599
1600 do { // Some serious "goto"-hater was there ;)
1601 u32 teahash, r5hash, yurahash;
1602
1603 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1604 retval = search_by_entry_key(s, &key, &path, &de);
1605 if (retval == IO_ERROR) {
1606 pathrelse(&path);
1607 return UNSET_HASH;
1608 }
1609 if (retval == NAME_NOT_FOUND)
1610 de.de_entry_num--;
1611 set_de_name_and_namelen(&de);
1612 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1613 /* allow override in this case */
1614 if (reiserfs_rupasov_hash(s)) {
1615 hash = YURA_HASH;
1616 }
1617 reiserfs_info(s, "FS seems to be empty, autodetect "
1618 "is using the default hash\n");
1619 break;
1620 }
1621 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1622 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1623 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1624 if (((teahash == r5hash)
1625 &&
1626 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1627 == r5hash)) || ((teahash == yurahash)
1628 && (yurahash ==
1629 GET_HASH_VALUE(deh_offset
1630 (&
1631 (de.
1632 de_deh[de.
1633 de_entry_num])))))
1634 || ((r5hash == yurahash)
1635 && (yurahash ==
1636 GET_HASH_VALUE(deh_offset
1637 (&(de.de_deh[de.de_entry_num])))))) {
1638 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1639 "automatically detect hash function. "
1640 "Please mount with -o "
1641 "hash={tea,rupasov,r5}");
1642 hash = UNSET_HASH;
1643 break;
1644 }
1645 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1646 yurahash)
1647 hash = YURA_HASH;
1648 else if (GET_HASH_VALUE
1649 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1650 hash = TEA_HASH;
1651 else if (GET_HASH_VALUE
1652 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1653 hash = R5_HASH;
1654 else {
1655 reiserfs_warning(s, "reiserfs-2506",
1656 "Unrecognised hash function");
1657 hash = UNSET_HASH;
1658 }
1659 } while (0);
1660
1661 pathrelse(&path);
1662 return hash;
1663 }
1664
1665 // finds out which hash names are sorted with
1666 static int what_hash(struct super_block *s)
1667 {
1668 __u32 code;
1669
1670 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1671
1672 /* reiserfs_hash_detect() == true if any of the hash mount options
1673 ** were used. We must check them to make sure the user isn't
1674 ** using a bad hash value
1675 */
1676 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1677 code = find_hash_out(s);
1678
1679 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1680 /* detection has found the hash, and we must check against the
1681 ** mount options
1682 */
1683 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1684 reiserfs_warning(s, "reiserfs-2507",
1685 "Error, %s hash detected, "
1686 "unable to force rupasov hash",
1687 reiserfs_hashname(code));
1688 code = UNSET_HASH;
1689 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1690 reiserfs_warning(s, "reiserfs-2508",
1691 "Error, %s hash detected, "
1692 "unable to force tea hash",
1693 reiserfs_hashname(code));
1694 code = UNSET_HASH;
1695 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1696 reiserfs_warning(s, "reiserfs-2509",
1697 "Error, %s hash detected, "
1698 "unable to force r5 hash",
1699 reiserfs_hashname(code));
1700 code = UNSET_HASH;
1701 }
1702 } else {
1703 /* find_hash_out was not called or could not determine the hash */
1704 if (reiserfs_rupasov_hash(s)) {
1705 code = YURA_HASH;
1706 } else if (reiserfs_tea_hash(s)) {
1707 code = TEA_HASH;
1708 } else if (reiserfs_r5_hash(s)) {
1709 code = R5_HASH;
1710 }
1711 }
1712
1713 /* if we are mounted RW, and we have a new valid hash code, update
1714 ** the super
1715 */
1716 if (code != UNSET_HASH &&
1717 !(s->s_flags & MS_RDONLY) &&
1718 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1719 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1720 }
1721 return code;
1722 }
1723
1724 // return pointer to appropriate function
1725 static hashf_t hash_function(struct super_block *s)
1726 {
1727 switch (what_hash(s)) {
1728 case TEA_HASH:
1729 reiserfs_info(s, "Using tea hash to sort names\n");
1730 return keyed_hash;
1731 case YURA_HASH:
1732 reiserfs_info(s, "Using rupasov hash to sort names\n");
1733 return yura_hash;
1734 case R5_HASH:
1735 reiserfs_info(s, "Using r5 hash to sort names\n");
1736 return r5_hash;
1737 }
1738 return NULL;
1739 }
1740
1741 // this is used to set up correct value for old partitions
1742 static int function2code(hashf_t func)
1743 {
1744 if (func == keyed_hash)
1745 return TEA_HASH;
1746 if (func == yura_hash)
1747 return YURA_HASH;
1748 if (func == r5_hash)
1749 return R5_HASH;
1750
1751 BUG(); // should never happen
1752
1753 return 0;
1754 }
1755
1756 #define SWARN(silent, s, id, ...) \
1757 if (!(silent)) \
1758 reiserfs_warning(s, id, __VA_ARGS__)
1759
1760 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1761 {
1762 struct inode *root_inode;
1763 struct reiserfs_transaction_handle th;
1764 int old_format = 0;
1765 unsigned long blocks;
1766 unsigned int commit_max_age = 0;
1767 int jinit_done = 0;
1768 struct reiserfs_iget_args args;
1769 struct reiserfs_super_block *rs;
1770 char *jdev_name;
1771 struct reiserfs_sb_info *sbi;
1772 int errval = -EINVAL;
1773 char *qf_names[MAXQUOTAS] = {};
1774 unsigned int qfmt = 0;
1775
1776 save_mount_options(s, data);
1777
1778 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1779 if (!sbi)
1780 return -ENOMEM;
1781 s->s_fs_info = sbi;
1782 /* Set default values for options: non-aggressive tails, RO on errors */
1783 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1784 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1785 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1786 /* no preallocation minimum, be smart in
1787 reiserfs_file_write instead */
1788 sbi->s_alloc_options.preallocmin = 0;
1789 /* Preallocate by 16 blocks (17-1) at once */
1790 sbi->s_alloc_options.preallocsize = 17;
1791 /* setup default block allocator options */
1792 reiserfs_init_alloc_options(s);
1793
1794 spin_lock_init(&sbi->old_work_lock);
1795 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1796 mutex_init(&sbi->lock);
1797 sbi->lock_depth = -1;
1798
1799 jdev_name = NULL;
1800 if (reiserfs_parse_options
1801 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1802 &commit_max_age, qf_names, &qfmt) == 0) {
1803 goto error_unlocked;
1804 }
1805 if (jdev_name && jdev_name[0]) {
1806 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1807 if (!sbi->s_jdev) {
1808 SWARN(silent, s, "", "Cannot allocate memory for "
1809 "journal device name");
1810 goto error;
1811 }
1812 }
1813 #ifdef CONFIG_QUOTA
1814 handle_quota_files(s, qf_names, &qfmt);
1815 #endif
1816
1817 if (blocks) {
1818 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1819 goto error_unlocked;
1820 }
1821
1822 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1823 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1824 old_format = 1;
1825 /* try new format (64-th 1k block), which can contain reiserfs super block */
1826 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1827 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1828 s->s_id);
1829 goto error_unlocked;
1830 }
1831
1832 rs = SB_DISK_SUPER_BLOCK(s);
1833 /* Let's do basic sanity check to verify that underlying device is not
1834 smaller than the filesystem. If the check fails then abort and scream,
1835 because bad stuff will happen otherwise. */
1836 if (s->s_bdev && s->s_bdev->bd_inode
1837 && i_size_read(s->s_bdev->bd_inode) <
1838 sb_block_count(rs) * sb_blocksize(rs)) {
1839 SWARN(silent, s, "", "Filesystem cannot be "
1840 "mounted because it is bigger than the device");
1841 SWARN(silent, s, "", "You may need to run fsck "
1842 "or increase size of your LVM partition");
1843 SWARN(silent, s, "", "Or may be you forgot to "
1844 "reboot after fdisk when it told you to");
1845 goto error_unlocked;
1846 }
1847
1848 sbi->s_mount_state = SB_REISERFS_STATE(s);
1849 sbi->s_mount_state = REISERFS_VALID_FS;
1850
1851 if ((errval = reiserfs_init_bitmap_cache(s))) {
1852 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1853 goto error_unlocked;
1854 }
1855
1856 errval = -EINVAL;
1857 #ifdef CONFIG_REISERFS_CHECK
1858 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1859 SWARN(silent, s, "", "- it is slow mode for debugging.");
1860 #endif
1861
1862 /* make data=ordered the default */
1863 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1864 !reiserfs_data_writeback(s)) {
1865 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1866 }
1867
1868 if (reiserfs_data_log(s)) {
1869 reiserfs_info(s, "using journaled data mode\n");
1870 } else if (reiserfs_data_ordered(s)) {
1871 reiserfs_info(s, "using ordered data mode\n");
1872 } else {
1873 reiserfs_info(s, "using writeback data mode\n");
1874 }
1875 if (reiserfs_barrier_flush(s)) {
1876 printk("reiserfs: using flush barriers\n");
1877 }
1878
1879 // set_device_ro(s->s_dev, 1) ;
1880 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1881 SWARN(silent, s, "sh-2022",
1882 "unable to initialize journal space");
1883 goto error_unlocked;
1884 } else {
1885 jinit_done = 1; /* once this is set, journal_release must be called
1886 ** if we error out of the mount
1887 */
1888 }
1889
1890 if (reread_meta_blocks(s)) {
1891 SWARN(silent, s, "jmacd-9",
1892 "unable to reread meta blocks after journal init");
1893 goto error_unlocked;
1894 }
1895
1896 if (replay_only(s))
1897 goto error_unlocked;
1898
1899 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1900 SWARN(silent, s, "clm-7000",
1901 "Detected readonly device, marking FS readonly");
1902 s->s_flags |= MS_RDONLY;
1903 }
1904 args.objectid = REISERFS_ROOT_OBJECTID;
1905 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1906 root_inode =
1907 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1908 reiserfs_init_locked_inode, (void *)(&args));
1909 if (!root_inode) {
1910 SWARN(silent, s, "jmacd-10", "get root inode failed");
1911 goto error_unlocked;
1912 }
1913
1914 /*
1915 * This path assumed to be called with the BKL in the old times.
1916 * Now we have inherited the big reiserfs lock from it and many
1917 * reiserfs helpers called in the mount path and elsewhere require
1918 * this lock to be held even if it's not always necessary. Let's be
1919 * conservative and hold it early. The window can be reduced after
1920 * careful review of the code.
1921 */
1922 reiserfs_write_lock(s);
1923
1924 if (root_inode->i_state & I_NEW) {
1925 reiserfs_read_locked_inode(root_inode, &args);
1926 unlock_new_inode(root_inode);
1927 }
1928
1929 s->s_root = d_make_root(root_inode);
1930 if (!s->s_root)
1931 goto error;
1932 // define and initialize hash function
1933 sbi->s_hash_function = hash_function(s);
1934 if (sbi->s_hash_function == NULL) {
1935 dput(s->s_root);
1936 s->s_root = NULL;
1937 goto error;
1938 }
1939
1940 if (is_reiserfs_3_5(rs)
1941 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1942 set_bit(REISERFS_3_5, &(sbi->s_properties));
1943 else if (old_format)
1944 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1945 else
1946 set_bit(REISERFS_3_6, &(sbi->s_properties));
1947
1948 if (!(s->s_flags & MS_RDONLY)) {
1949
1950 errval = journal_begin(&th, s, 1);
1951 if (errval) {
1952 dput(s->s_root);
1953 s->s_root = NULL;
1954 goto error;
1955 }
1956 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1957
1958 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1959 set_sb_fs_state(rs, 0);
1960
1961 /* Clear out s_bmap_nr if it would wrap. We can handle this
1962 * case, but older revisions can't. This will cause the
1963 * file system to fail mount on those older implementations,
1964 * avoiding corruption. -jeffm */
1965 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1966 sb_bmap_nr(rs) != 0) {
1967 reiserfs_warning(s, "super-2030", "This file system "
1968 "claims to use %u bitmap blocks in "
1969 "its super block, but requires %u. "
1970 "Clearing to zero.", sb_bmap_nr(rs),
1971 reiserfs_bmap_count(s));
1972
1973 set_sb_bmap_nr(rs, 0);
1974 }
1975
1976 if (old_format_only(s)) {
1977 /* filesystem of format 3.5 either with standard or non-standard
1978 journal */
1979 if (convert_reiserfs(s)) {
1980 /* and -o conv is given */
1981 if (!silent)
1982 reiserfs_info(s,
1983 "converting 3.5 filesystem to the 3.6 format");
1984
1985 if (is_reiserfs_3_5(rs))
1986 /* put magic string of 3.6 format. 2.2 will not be able to
1987 mount this filesystem anymore */
1988 memcpy(rs->s_v1.s_magic,
1989 reiserfs_3_6_magic_string,
1990 sizeof
1991 (reiserfs_3_6_magic_string));
1992
1993 set_sb_version(rs, REISERFS_VERSION_2);
1994 reiserfs_convert_objectid_map_v1(s);
1995 set_bit(REISERFS_3_6, &(sbi->s_properties));
1996 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1997 } else if (!silent) {
1998 reiserfs_info(s, "using 3.5.x disk format\n");
1999 }
2000 } else
2001 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2002
2003
2004 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2005 errval = journal_end(&th, s, 1);
2006 if (errval) {
2007 dput(s->s_root);
2008 s->s_root = NULL;
2009 goto error;
2010 }
2011
2012 reiserfs_write_unlock(s);
2013 if ((errval = reiserfs_lookup_privroot(s)) ||
2014 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2015 dput(s->s_root);
2016 s->s_root = NULL;
2017 goto error_unlocked;
2018 }
2019 reiserfs_write_lock(s);
2020
2021 /* look for files which were to be removed in previous session */
2022 finish_unfinished(s);
2023 } else {
2024 if (old_format_only(s) && !silent) {
2025 reiserfs_info(s, "using 3.5.x disk format\n");
2026 }
2027
2028 reiserfs_write_unlock(s);
2029 if ((errval = reiserfs_lookup_privroot(s)) ||
2030 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2031 dput(s->s_root);
2032 s->s_root = NULL;
2033 goto error_unlocked;
2034 }
2035 reiserfs_write_lock(s);
2036 }
2037 // mark hash in super block: it could be unset. overwrite should be ok
2038 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2039
2040 handle_attrs(s);
2041
2042 reiserfs_proc_info_init(s);
2043
2044 init_waitqueue_head(&(sbi->s_wait));
2045 spin_lock_init(&sbi->bitmap_lock);
2046
2047 reiserfs_write_unlock(s);
2048
2049 return (0);
2050
2051 error:
2052 reiserfs_write_unlock(s);
2053
2054 error_unlocked:
2055 /* kill the commit thread, free journal ram */
2056 if (jinit_done) {
2057 reiserfs_write_lock(s);
2058 journal_release_error(NULL, s);
2059 reiserfs_write_unlock(s);
2060 }
2061
2062 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2063
2064 reiserfs_free_bitmap_cache(s);
2065 if (SB_BUFFER_WITH_SB(s))
2066 brelse(SB_BUFFER_WITH_SB(s));
2067 #ifdef CONFIG_QUOTA
2068 {
2069 int j;
2070 for (j = 0; j < MAXQUOTAS; j++)
2071 kfree(qf_names[j]);
2072 }
2073 #endif
2074 kfree(sbi);
2075
2076 s->s_fs_info = NULL;
2077 return errval;
2078 }
2079
2080 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2081 {
2082 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2083
2084 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2085 buf->f_bfree = sb_free_blocks(rs);
2086 buf->f_bavail = buf->f_bfree;
2087 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2088 buf->f_bsize = dentry->d_sb->s_blocksize;
2089 /* changed to accommodate gcc folks. */
2090 buf->f_type = REISERFS_SUPER_MAGIC;
2091 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2092 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2093 sizeof(rs->s_uuid)/2);
2094
2095 return 0;
2096 }
2097
2098 #ifdef CONFIG_QUOTA
2099 static int reiserfs_write_dquot(struct dquot *dquot)
2100 {
2101 struct reiserfs_transaction_handle th;
2102 int ret, err;
2103 int depth;
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 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2112 ret = dquot_commit(dquot);
2113 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2114 err =
2115 journal_end(&th, dquot->dq_sb,
2116 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2117 if (!ret && err)
2118 ret = err;
2119 out:
2120 reiserfs_write_unlock(dquot->dq_sb);
2121 return ret;
2122 }
2123
2124 static int reiserfs_acquire_dquot(struct dquot *dquot)
2125 {
2126 struct reiserfs_transaction_handle th;
2127 int ret, err;
2128 int depth;
2129
2130 reiserfs_write_lock(dquot->dq_sb);
2131 ret =
2132 journal_begin(&th, dquot->dq_sb,
2133 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2134 if (ret)
2135 goto out;
2136 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2137 ret = dquot_acquire(dquot);
2138 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2139 err =
2140 journal_end(&th, dquot->dq_sb,
2141 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2142 if (!ret && err)
2143 ret = err;
2144 out:
2145 reiserfs_write_unlock(dquot->dq_sb);
2146 return ret;
2147 }
2148
2149 static int reiserfs_release_dquot(struct dquot *dquot)
2150 {
2151 struct reiserfs_transaction_handle th;
2152 int ret, err;
2153
2154 reiserfs_write_lock(dquot->dq_sb);
2155 ret =
2156 journal_begin(&th, dquot->dq_sb,
2157 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2158 reiserfs_write_unlock(dquot->dq_sb);
2159 if (ret) {
2160 /* Release dquot anyway to avoid endless cycle in dqput() */
2161 dquot_release(dquot);
2162 goto out;
2163 }
2164 ret = dquot_release(dquot);
2165 reiserfs_write_lock(dquot->dq_sb);
2166 err =
2167 journal_end(&th, dquot->dq_sb,
2168 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2169 if (!ret && err)
2170 ret = err;
2171 reiserfs_write_unlock(dquot->dq_sb);
2172 out:
2173 return ret;
2174 }
2175
2176 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2177 {
2178 /* Are we journaling quotas? */
2179 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2180 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2181 dquot_mark_dquot_dirty(dquot);
2182 return reiserfs_write_dquot(dquot);
2183 } else
2184 return dquot_mark_dquot_dirty(dquot);
2185 }
2186
2187 static int reiserfs_write_info(struct super_block *sb, int type)
2188 {
2189 struct reiserfs_transaction_handle th;
2190 int ret, err;
2191 int depth;
2192
2193 /* Data block + inode block */
2194 reiserfs_write_lock(sb);
2195 ret = journal_begin(&th, sb, 2);
2196 if (ret)
2197 goto out;
2198 depth = reiserfs_write_unlock_nested(sb);
2199 ret = dquot_commit_info(sb, type);
2200 reiserfs_write_lock_nested(sb, depth);
2201 err = journal_end(&th, sb, 2);
2202 if (!ret && err)
2203 ret = err;
2204 out:
2205 reiserfs_write_unlock(sb);
2206 return ret;
2207 }
2208
2209 /*
2210 * Turn on quotas during mount time - we need to find the quota file and such...
2211 */
2212 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2213 {
2214 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2215 REISERFS_SB(sb)->s_jquota_fmt, type);
2216 }
2217
2218 /*
2219 * Standard function to be called on quota_on
2220 */
2221 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2222 struct path *path)
2223 {
2224 int err;
2225 struct inode *inode;
2226 struct reiserfs_transaction_handle th;
2227 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2228
2229 reiserfs_write_lock(sb);
2230 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2231 err = -EINVAL;
2232 goto out;
2233 }
2234
2235 /* Quotafile not on the same filesystem? */
2236 if (path->dentry->d_sb != sb) {
2237 err = -EXDEV;
2238 goto out;
2239 }
2240 inode = path->dentry->d_inode;
2241 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2242 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2243 err = reiserfs_unpack(inode, NULL);
2244 if (err) {
2245 reiserfs_warning(sb, "super-6520",
2246 "Unpacking tail of quota file failed"
2247 " (%d). Cannot turn on quotas.", err);
2248 err = -EINVAL;
2249 goto out;
2250 }
2251 mark_inode_dirty(inode);
2252 }
2253 /* Journaling quota? */
2254 if (REISERFS_SB(sb)->s_qf_names[type]) {
2255 /* Quotafile not of fs root? */
2256 if (path->dentry->d_parent != sb->s_root)
2257 reiserfs_warning(sb, "super-6521",
2258 "Quota file not on filesystem root. "
2259 "Journalled quota will not work.");
2260 }
2261
2262 /*
2263 * When we journal data on quota file, we have to flush journal to see
2264 * all updates to the file when we bypass pagecache...
2265 */
2266 if (reiserfs_file_data_log(inode)) {
2267 /* Just start temporary transaction and finish it */
2268 err = journal_begin(&th, sb, 1);
2269 if (err)
2270 goto out;
2271 err = journal_end_sync(&th, sb, 1);
2272 if (err)
2273 goto out;
2274 }
2275 reiserfs_write_unlock(sb);
2276 return dquot_quota_on(sb, type, format_id, path);
2277 out:
2278 reiserfs_write_unlock(sb);
2279 return err;
2280 }
2281
2282 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2283 * acquiring the locks... As quota files are never truncated and quota code
2284 * itself serializes the operations (and no one else should touch the files)
2285 * we don't have to be afraid of races */
2286 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2287 size_t len, loff_t off)
2288 {
2289 struct inode *inode = sb_dqopt(sb)->files[type];
2290 unsigned long blk = off >> sb->s_blocksize_bits;
2291 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2292 size_t toread;
2293 struct buffer_head tmp_bh, *bh;
2294 loff_t i_size = i_size_read(inode);
2295
2296 if (off > i_size)
2297 return 0;
2298 if (off + len > i_size)
2299 len = i_size - off;
2300 toread = len;
2301 while (toread > 0) {
2302 tocopy =
2303 sb->s_blocksize - offset <
2304 toread ? sb->s_blocksize - offset : toread;
2305 tmp_bh.b_state = 0;
2306 /* Quota files are without tails so we can safely use this function */
2307 reiserfs_write_lock(sb);
2308 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2309 reiserfs_write_unlock(sb);
2310 if (err)
2311 return err;
2312 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2313 memset(data, 0, tocopy);
2314 else {
2315 bh = sb_bread(sb, tmp_bh.b_blocknr);
2316 if (!bh)
2317 return -EIO;
2318 memcpy(data, bh->b_data + offset, tocopy);
2319 brelse(bh);
2320 }
2321 offset = 0;
2322 toread -= tocopy;
2323 data += tocopy;
2324 blk++;
2325 }
2326 return len;
2327 }
2328
2329 /* Write to quotafile (we know the transaction is already started and has
2330 * enough credits) */
2331 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2332 const char *data, size_t len, loff_t off)
2333 {
2334 struct inode *inode = sb_dqopt(sb)->files[type];
2335 unsigned long blk = off >> sb->s_blocksize_bits;
2336 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2337 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2338 size_t towrite = len;
2339 struct buffer_head tmp_bh, *bh;
2340
2341 if (!current->journal_info) {
2342 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2343 " cancelled because transaction is not started.\n",
2344 (unsigned long long)off, (unsigned long long)len);
2345 return -EIO;
2346 }
2347 while (towrite > 0) {
2348 tocopy = sb->s_blocksize - offset < towrite ?
2349 sb->s_blocksize - offset : towrite;
2350 tmp_bh.b_state = 0;
2351 reiserfs_write_lock(sb);
2352 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2353 reiserfs_write_unlock(sb);
2354 if (err)
2355 goto out;
2356 if (offset || tocopy != sb->s_blocksize)
2357 bh = sb_bread(sb, tmp_bh.b_blocknr);
2358 else
2359 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2360 if (!bh) {
2361 err = -EIO;
2362 goto out;
2363 }
2364 lock_buffer(bh);
2365 memcpy(bh->b_data + offset, data, tocopy);
2366 flush_dcache_page(bh->b_page);
2367 set_buffer_uptodate(bh);
2368 unlock_buffer(bh);
2369 reiserfs_write_lock(sb);
2370 reiserfs_prepare_for_journal(sb, bh, 1);
2371 journal_mark_dirty(current->journal_info, sb, bh);
2372 if (!journal_quota)
2373 reiserfs_add_ordered_list(inode, bh);
2374 reiserfs_write_unlock(sb);
2375 brelse(bh);
2376 offset = 0;
2377 towrite -= tocopy;
2378 data += tocopy;
2379 blk++;
2380 }
2381 out:
2382 if (len == towrite)
2383 return err;
2384 if (inode->i_size < off + len - towrite)
2385 i_size_write(inode, off + len - towrite);
2386 inode->i_version++;
2387 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2388 mark_inode_dirty(inode);
2389 return len - towrite;
2390 }
2391
2392 #endif
2393
2394 static struct dentry *get_super_block(struct file_system_type *fs_type,
2395 int flags, const char *dev_name,
2396 void *data)
2397 {
2398 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2399 }
2400
2401 static int __init init_reiserfs_fs(void)
2402 {
2403 int ret;
2404
2405 if ((ret = init_inodecache())) {
2406 return ret;
2407 }
2408
2409 reiserfs_proc_info_global_init();
2410
2411 ret = register_filesystem(&reiserfs_fs_type);
2412
2413 if (ret == 0) {
2414 return 0;
2415 }
2416
2417 reiserfs_proc_info_global_done();
2418 destroy_inodecache();
2419
2420 return ret;
2421 }
2422
2423 static void __exit exit_reiserfs_fs(void)
2424 {
2425 reiserfs_proc_info_global_done();
2426 unregister_filesystem(&reiserfs_fs_type);
2427 destroy_inodecache();
2428 }
2429
2430 struct file_system_type reiserfs_fs_type = {
2431 .owner = THIS_MODULE,
2432 .name = "reiserfs",
2433 .mount = get_super_block,
2434 .kill_sb = reiserfs_kill_sb,
2435 .fs_flags = FS_REQUIRES_DEV,
2436 };
2437 MODULE_ALIAS_FS("reiserfs");
2438
2439 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2440 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2441 MODULE_LICENSE("GPL");
2442
2443 module_init(init_reiserfs_fs);
2444 module_exit(exit_reiserfs_fs);
Linux with added FPC-III support