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fs: push sync_filesystem() down to the file system's remount_fs()
[mirror_ubuntu-artful-kernel.git] / fs / reiserfs / super.c
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <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 sync_filesystem(s);
1323 reiserfs_write_lock(s);
1324
1325 #ifdef CONFIG_QUOTA
1326 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327 #endif
1328
1329 rs = SB_DISK_SUPER_BLOCK(s);
1330
1331 if (!reiserfs_parse_options
1332 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333 qf_names, &qfmt)) {
1334 #ifdef CONFIG_QUOTA
1335 for (i = 0; i < MAXQUOTAS; i++)
1336 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1337 kfree(qf_names[i]);
1338 #endif
1339 err = -EINVAL;
1340 goto out_err_unlock;
1341 }
1342 #ifdef CONFIG_QUOTA
1343 handle_quota_files(s, qf_names, &qfmt);
1344 #endif
1345
1346 handle_attrs(s);
1347
1348 /* Add options that are safe here */
1349 safe_mask |= 1 << REISERFS_SMALLTAIL;
1350 safe_mask |= 1 << REISERFS_LARGETAIL;
1351 safe_mask |= 1 << REISERFS_NO_BORDER;
1352 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1353 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1354 safe_mask |= 1 << REISERFS_TEST4;
1355 safe_mask |= 1 << REISERFS_ATTRS;
1356 safe_mask |= 1 << REISERFS_XATTRS_USER;
1357 safe_mask |= 1 << REISERFS_POSIXACL;
1358 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1359 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1360 safe_mask |= 1 << REISERFS_ERROR_RO;
1361 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1362 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1363 safe_mask |= 1 << REISERFS_USRQUOTA;
1364 safe_mask |= 1 << REISERFS_GRPQUOTA;
1365
1366 /* Update the bitmask, taking care to keep
1367 * the bits we're not allowed to change here */
1368 REISERFS_SB(s)->s_mount_opt =
1369 (REISERFS_SB(s)->
1370 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1371
1372 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1373 journal->j_max_commit_age = commit_max_age;
1374 journal->j_max_trans_age = commit_max_age;
1375 } else if (commit_max_age == 0) {
1376 /* 0 means restore defaults. */
1377 journal->j_max_commit_age = journal->j_default_max_commit_age;
1378 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1379 }
1380
1381 if (blocks) {
1382 err = reiserfs_resize(s, blocks);
1383 if (err != 0)
1384 goto out_err_unlock;
1385 }
1386
1387 if (*mount_flags & MS_RDONLY) {
1388 reiserfs_write_unlock(s);
1389 reiserfs_xattr_init(s, *mount_flags);
1390 /* remount read-only */
1391 if (s->s_flags & MS_RDONLY)
1392 /* it is read-only already */
1393 goto out_ok_unlocked;
1394
1395 err = dquot_suspend(s, -1);
1396 if (err < 0)
1397 goto out_err;
1398
1399 /* try to remount file system with read-only permissions */
1400 if (sb_umount_state(rs) == REISERFS_VALID_FS
1401 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1402 goto out_ok_unlocked;
1403 }
1404
1405 reiserfs_write_lock(s);
1406
1407 err = journal_begin(&th, s, 10);
1408 if (err)
1409 goto out_err_unlock;
1410
1411 /* Mounting a rw partition read-only. */
1412 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1413 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1414 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1415 } else {
1416 /* remount read-write */
1417 if (!(s->s_flags & MS_RDONLY)) {
1418 reiserfs_write_unlock(s);
1419 reiserfs_xattr_init(s, *mount_flags);
1420 goto out_ok_unlocked; /* We are read-write already */
1421 }
1422
1423 if (reiserfs_is_journal_aborted(journal)) {
1424 err = journal->j_errno;
1425 goto out_err_unlock;
1426 }
1427
1428 handle_data_mode(s, mount_options);
1429 handle_barrier_mode(s, mount_options);
1430 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1431 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1432 err = journal_begin(&th, s, 10);
1433 if (err)
1434 goto out_err_unlock;
1435
1436 /* Mount a partition which is read-only, read-write */
1437 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1438 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1439 s->s_flags &= ~MS_RDONLY;
1440 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1441 if (!old_format_only(s))
1442 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1443 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1444 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1445 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1446 }
1447 /* this will force a full flush of all journal lists */
1448 SB_JOURNAL(s)->j_must_wait = 1;
1449 err = journal_end(&th, s, 10);
1450 if (err)
1451 goto out_err_unlock;
1452
1453 reiserfs_write_unlock(s);
1454 if (!(*mount_flags & MS_RDONLY)) {
1455 dquot_resume(s, -1);
1456 reiserfs_write_lock(s);
1457 finish_unfinished(s);
1458 reiserfs_write_unlock(s);
1459 reiserfs_xattr_init(s, *mount_flags);
1460 }
1461
1462 out_ok_unlocked:
1463 replace_mount_options(s, new_opts);
1464 return 0;
1465
1466 out_err_unlock:
1467 reiserfs_write_unlock(s);
1468 out_err:
1469 kfree(new_opts);
1470 return err;
1471 }
1472
1473 static int read_super_block(struct super_block *s, int offset)
1474 {
1475 struct buffer_head *bh;
1476 struct reiserfs_super_block *rs;
1477 int fs_blocksize;
1478
1479 bh = sb_bread(s, offset / s->s_blocksize);
1480 if (!bh) {
1481 reiserfs_warning(s, "sh-2006",
1482 "bread failed (dev %s, block %lu, size %lu)",
1483 s->s_id, offset / s->s_blocksize,
1484 s->s_blocksize);
1485 return 1;
1486 }
1487
1488 rs = (struct reiserfs_super_block *)bh->b_data;
1489 if (!is_any_reiserfs_magic_string(rs)) {
1490 brelse(bh);
1491 return 1;
1492 }
1493 //
1494 // ok, reiserfs signature (old or new) found in at the given offset
1495 //
1496 fs_blocksize = sb_blocksize(rs);
1497 brelse(bh);
1498 sb_set_blocksize(s, fs_blocksize);
1499
1500 bh = sb_bread(s, offset / s->s_blocksize);
1501 if (!bh) {
1502 reiserfs_warning(s, "sh-2007",
1503 "bread failed (dev %s, block %lu, size %lu)",
1504 s->s_id, offset / s->s_blocksize,
1505 s->s_blocksize);
1506 return 1;
1507 }
1508
1509 rs = (struct reiserfs_super_block *)bh->b_data;
1510 if (sb_blocksize(rs) != s->s_blocksize) {
1511 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1512 "filesystem on (dev %s, block %Lu, size %lu)",
1513 s->s_id,
1514 (unsigned long long)bh->b_blocknr,
1515 s->s_blocksize);
1516 brelse(bh);
1517 return 1;
1518 }
1519
1520 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1521 brelse(bh);
1522 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1523 "--rebuild-tree run detected. Please run\n"
1524 "reiserfsck --rebuild-tree and wait for a "
1525 "completion. If that fails\n"
1526 "get newer reiserfsprogs package");
1527 return 1;
1528 }
1529
1530 SB_BUFFER_WITH_SB(s) = bh;
1531 SB_DISK_SUPER_BLOCK(s) = rs;
1532
1533 if (is_reiserfs_jr(rs)) {
1534 /* magic is of non-standard journal filesystem, look at s_version to
1535 find which format is in use */
1536 if (sb_version(rs) == REISERFS_VERSION_2)
1537 reiserfs_info(s, "found reiserfs format \"3.6\""
1538 " with non-standard journal\n");
1539 else if (sb_version(rs) == REISERFS_VERSION_1)
1540 reiserfs_info(s, "found reiserfs format \"3.5\""
1541 " with non-standard journal\n");
1542 else {
1543 reiserfs_warning(s, "sh-2012", "found unknown "
1544 "format \"%u\" of reiserfs with "
1545 "non-standard magic", sb_version(rs));
1546 return 1;
1547 }
1548 } else
1549 /* s_version of standard format may contain incorrect information,
1550 so we just look at the magic string */
1551 reiserfs_info(s,
1552 "found reiserfs format \"%s\" with standard journal\n",
1553 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1554
1555 s->s_op = &reiserfs_sops;
1556 s->s_export_op = &reiserfs_export_ops;
1557 #ifdef CONFIG_QUOTA
1558 s->s_qcop = &reiserfs_qctl_operations;
1559 s->dq_op = &reiserfs_quota_operations;
1560 #endif
1561
1562 /* new format is limited by the 32 bit wide i_blocks field, want to
1563 ** be one full block below that.
1564 */
1565 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1566 return 0;
1567 }
1568
1569 /* after journal replay, reread all bitmap and super blocks */
1570 static int reread_meta_blocks(struct super_block *s)
1571 {
1572 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1573 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1574 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1575 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1576 return 1;
1577 }
1578
1579 return 0;
1580 }
1581
1582 /////////////////////////////////////////////////////
1583 // hash detection stuff
1584
1585 // if root directory is empty - we set default - Yura's - hash and
1586 // warn about it
1587 // FIXME: we look for only one name in a directory. If tea and yura
1588 // bith have the same value - we ask user to send report to the
1589 // mailing list
1590 static __u32 find_hash_out(struct super_block *s)
1591 {
1592 int retval;
1593 struct inode *inode;
1594 struct cpu_key key;
1595 INITIALIZE_PATH(path);
1596 struct reiserfs_dir_entry de;
1597 __u32 hash = DEFAULT_HASH;
1598
1599 inode = s->s_root->d_inode;
1600
1601 do { // Some serious "goto"-hater was there ;)
1602 u32 teahash, r5hash, yurahash;
1603
1604 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1605 retval = search_by_entry_key(s, &key, &path, &de);
1606 if (retval == IO_ERROR) {
1607 pathrelse(&path);
1608 return UNSET_HASH;
1609 }
1610 if (retval == NAME_NOT_FOUND)
1611 de.de_entry_num--;
1612 set_de_name_and_namelen(&de);
1613 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1614 /* allow override in this case */
1615 if (reiserfs_rupasov_hash(s)) {
1616 hash = YURA_HASH;
1617 }
1618 reiserfs_info(s, "FS seems to be empty, autodetect "
1619 "is using the default hash\n");
1620 break;
1621 }
1622 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1623 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1624 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1625 if (((teahash == r5hash)
1626 &&
1627 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1628 == r5hash)) || ((teahash == yurahash)
1629 && (yurahash ==
1630 GET_HASH_VALUE(deh_offset
1631 (&
1632 (de.
1633 de_deh[de.
1634 de_entry_num])))))
1635 || ((r5hash == yurahash)
1636 && (yurahash ==
1637 GET_HASH_VALUE(deh_offset
1638 (&(de.de_deh[de.de_entry_num])))))) {
1639 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1640 "automatically detect hash function. "
1641 "Please mount with -o "
1642 "hash={tea,rupasov,r5}");
1643 hash = UNSET_HASH;
1644 break;
1645 }
1646 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1647 yurahash)
1648 hash = YURA_HASH;
1649 else if (GET_HASH_VALUE
1650 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1651 hash = TEA_HASH;
1652 else if (GET_HASH_VALUE
1653 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1654 hash = R5_HASH;
1655 else {
1656 reiserfs_warning(s, "reiserfs-2506",
1657 "Unrecognised hash function");
1658 hash = UNSET_HASH;
1659 }
1660 } while (0);
1661
1662 pathrelse(&path);
1663 return hash;
1664 }
1665
1666 // finds out which hash names are sorted with
1667 static int what_hash(struct super_block *s)
1668 {
1669 __u32 code;
1670
1671 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1672
1673 /* reiserfs_hash_detect() == true if any of the hash mount options
1674 ** were used. We must check them to make sure the user isn't
1675 ** using a bad hash value
1676 */
1677 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1678 code = find_hash_out(s);
1679
1680 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1681 /* detection has found the hash, and we must check against the
1682 ** mount options
1683 */
1684 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1685 reiserfs_warning(s, "reiserfs-2507",
1686 "Error, %s hash detected, "
1687 "unable to force rupasov hash",
1688 reiserfs_hashname(code));
1689 code = UNSET_HASH;
1690 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1691 reiserfs_warning(s, "reiserfs-2508",
1692 "Error, %s hash detected, "
1693 "unable to force tea hash",
1694 reiserfs_hashname(code));
1695 code = UNSET_HASH;
1696 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1697 reiserfs_warning(s, "reiserfs-2509",
1698 "Error, %s hash detected, "
1699 "unable to force r5 hash",
1700 reiserfs_hashname(code));
1701 code = UNSET_HASH;
1702 }
1703 } else {
1704 /* find_hash_out was not called or could not determine the hash */
1705 if (reiserfs_rupasov_hash(s)) {
1706 code = YURA_HASH;
1707 } else if (reiserfs_tea_hash(s)) {
1708 code = TEA_HASH;
1709 } else if (reiserfs_r5_hash(s)) {
1710 code = R5_HASH;
1711 }
1712 }
1713
1714 /* if we are mounted RW, and we have a new valid hash code, update
1715 ** the super
1716 */
1717 if (code != UNSET_HASH &&
1718 !(s->s_flags & MS_RDONLY) &&
1719 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1720 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1721 }
1722 return code;
1723 }
1724
1725 // return pointer to appropriate function
1726 static hashf_t hash_function(struct super_block *s)
1727 {
1728 switch (what_hash(s)) {
1729 case TEA_HASH:
1730 reiserfs_info(s, "Using tea hash to sort names\n");
1731 return keyed_hash;
1732 case YURA_HASH:
1733 reiserfs_info(s, "Using rupasov hash to sort names\n");
1734 return yura_hash;
1735 case R5_HASH:
1736 reiserfs_info(s, "Using r5 hash to sort names\n");
1737 return r5_hash;
1738 }
1739 return NULL;
1740 }
1741
1742 // this is used to set up correct value for old partitions
1743 static int function2code(hashf_t func)
1744 {
1745 if (func == keyed_hash)
1746 return TEA_HASH;
1747 if (func == yura_hash)
1748 return YURA_HASH;
1749 if (func == r5_hash)
1750 return R5_HASH;
1751
1752 BUG(); // should never happen
1753
1754 return 0;
1755 }
1756
1757 #define SWARN(silent, s, id, ...) \
1758 if (!(silent)) \
1759 reiserfs_warning(s, id, __VA_ARGS__)
1760
1761 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1762 {
1763 struct inode *root_inode;
1764 struct reiserfs_transaction_handle th;
1765 int old_format = 0;
1766 unsigned long blocks;
1767 unsigned int commit_max_age = 0;
1768 int jinit_done = 0;
1769 struct reiserfs_iget_args args;
1770 struct reiserfs_super_block *rs;
1771 char *jdev_name;
1772 struct reiserfs_sb_info *sbi;
1773 int errval = -EINVAL;
1774 char *qf_names[MAXQUOTAS] = {};
1775 unsigned int qfmt = 0;
1776
1777 save_mount_options(s, data);
1778
1779 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1780 if (!sbi)
1781 return -ENOMEM;
1782 s->s_fs_info = sbi;
1783 /* Set default values for options: non-aggressive tails, RO on errors */
1784 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1785 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1786 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1787 /* no preallocation minimum, be smart in
1788 reiserfs_file_write instead */
1789 sbi->s_alloc_options.preallocmin = 0;
1790 /* Preallocate by 16 blocks (17-1) at once */
1791 sbi->s_alloc_options.preallocsize = 17;
1792 /* setup default block allocator options */
1793 reiserfs_init_alloc_options(s);
1794
1795 spin_lock_init(&sbi->old_work_lock);
1796 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1797 mutex_init(&sbi->lock);
1798 sbi->lock_depth = -1;
1799
1800 jdev_name = NULL;
1801 if (reiserfs_parse_options
1802 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1803 &commit_max_age, qf_names, &qfmt) == 0) {
1804 goto error_unlocked;
1805 }
1806 if (jdev_name && jdev_name[0]) {
1807 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1808 if (!sbi->s_jdev) {
1809 SWARN(silent, s, "", "Cannot allocate memory for "
1810 "journal device name");
1811 goto error;
1812 }
1813 }
1814 #ifdef CONFIG_QUOTA
1815 handle_quota_files(s, qf_names, &qfmt);
1816 #endif
1817
1818 if (blocks) {
1819 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1820 goto error_unlocked;
1821 }
1822
1823 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1824 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1825 old_format = 1;
1826 /* try new format (64-th 1k block), which can contain reiserfs super block */
1827 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1828 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1829 s->s_id);
1830 goto error_unlocked;
1831 }
1832
1833 rs = SB_DISK_SUPER_BLOCK(s);
1834 /* Let's do basic sanity check to verify that underlying device is not
1835 smaller than the filesystem. If the check fails then abort and scream,
1836 because bad stuff will happen otherwise. */
1837 if (s->s_bdev && s->s_bdev->bd_inode
1838 && i_size_read(s->s_bdev->bd_inode) <
1839 sb_block_count(rs) * sb_blocksize(rs)) {
1840 SWARN(silent, s, "", "Filesystem cannot be "
1841 "mounted because it is bigger than the device");
1842 SWARN(silent, s, "", "You may need to run fsck "
1843 "or increase size of your LVM partition");
1844 SWARN(silent, s, "", "Or may be you forgot to "
1845 "reboot after fdisk when it told you to");
1846 goto error_unlocked;
1847 }
1848
1849 sbi->s_mount_state = SB_REISERFS_STATE(s);
1850 sbi->s_mount_state = REISERFS_VALID_FS;
1851
1852 if ((errval = reiserfs_init_bitmap_cache(s))) {
1853 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1854 goto error_unlocked;
1855 }
1856
1857 errval = -EINVAL;
1858 #ifdef CONFIG_REISERFS_CHECK
1859 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1860 SWARN(silent, s, "", "- it is slow mode for debugging.");
1861 #endif
1862
1863 /* make data=ordered the default */
1864 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1865 !reiserfs_data_writeback(s)) {
1866 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1867 }
1868
1869 if (reiserfs_data_log(s)) {
1870 reiserfs_info(s, "using journaled data mode\n");
1871 } else if (reiserfs_data_ordered(s)) {
1872 reiserfs_info(s, "using ordered data mode\n");
1873 } else {
1874 reiserfs_info(s, "using writeback data mode\n");
1875 }
1876 if (reiserfs_barrier_flush(s)) {
1877 printk("reiserfs: using flush barriers\n");
1878 }
1879
1880 // set_device_ro(s->s_dev, 1) ;
1881 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1882 SWARN(silent, s, "sh-2022",
1883 "unable to initialize journal space");
1884 goto error_unlocked;
1885 } else {
1886 jinit_done = 1; /* once this is set, journal_release must be called
1887 ** if we error out of the mount
1888 */
1889 }
1890
1891 if (reread_meta_blocks(s)) {
1892 SWARN(silent, s, "jmacd-9",
1893 "unable to reread meta blocks after journal init");
1894 goto error_unlocked;
1895 }
1896
1897 if (replay_only(s))
1898 goto error_unlocked;
1899
1900 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1901 SWARN(silent, s, "clm-7000",
1902 "Detected readonly device, marking FS readonly");
1903 s->s_flags |= MS_RDONLY;
1904 }
1905 args.objectid = REISERFS_ROOT_OBJECTID;
1906 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1907 root_inode =
1908 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1909 reiserfs_init_locked_inode, (void *)(&args));
1910 if (!root_inode) {
1911 SWARN(silent, s, "jmacd-10", "get root inode failed");
1912 goto error_unlocked;
1913 }
1914
1915 /*
1916 * This path assumed to be called with the BKL in the old times.
1917 * Now we have inherited the big reiserfs lock from it and many
1918 * reiserfs helpers called in the mount path and elsewhere require
1919 * this lock to be held even if it's not always necessary. Let's be
1920 * conservative and hold it early. The window can be reduced after
1921 * careful review of the code.
1922 */
1923 reiserfs_write_lock(s);
1924
1925 if (root_inode->i_state & I_NEW) {
1926 reiserfs_read_locked_inode(root_inode, &args);
1927 unlock_new_inode(root_inode);
1928 }
1929
1930 s->s_root = d_make_root(root_inode);
1931 if (!s->s_root)
1932 goto error;
1933 // define and initialize hash function
1934 sbi->s_hash_function = hash_function(s);
1935 if (sbi->s_hash_function == NULL) {
1936 dput(s->s_root);
1937 s->s_root = NULL;
1938 goto error;
1939 }
1940
1941 if (is_reiserfs_3_5(rs)
1942 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1943 set_bit(REISERFS_3_5, &(sbi->s_properties));
1944 else if (old_format)
1945 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1946 else
1947 set_bit(REISERFS_3_6, &(sbi->s_properties));
1948
1949 if (!(s->s_flags & MS_RDONLY)) {
1950
1951 errval = journal_begin(&th, s, 1);
1952 if (errval) {
1953 dput(s->s_root);
1954 s->s_root = NULL;
1955 goto error;
1956 }
1957 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1958
1959 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1960 set_sb_fs_state(rs, 0);
1961
1962 /* Clear out s_bmap_nr if it would wrap. We can handle this
1963 * case, but older revisions can't. This will cause the
1964 * file system to fail mount on those older implementations,
1965 * avoiding corruption. -jeffm */
1966 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1967 sb_bmap_nr(rs) != 0) {
1968 reiserfs_warning(s, "super-2030", "This file system "
1969 "claims to use %u bitmap blocks in "
1970 "its super block, but requires %u. "
1971 "Clearing to zero.", sb_bmap_nr(rs),
1972 reiserfs_bmap_count(s));
1973
1974 set_sb_bmap_nr(rs, 0);
1975 }
1976
1977 if (old_format_only(s)) {
1978 /* filesystem of format 3.5 either with standard or non-standard
1979 journal */
1980 if (convert_reiserfs(s)) {
1981 /* and -o conv is given */
1982 if (!silent)
1983 reiserfs_info(s,
1984 "converting 3.5 filesystem to the 3.6 format");
1985
1986 if (is_reiserfs_3_5(rs))
1987 /* put magic string of 3.6 format. 2.2 will not be able to
1988 mount this filesystem anymore */
1989 memcpy(rs->s_v1.s_magic,
1990 reiserfs_3_6_magic_string,
1991 sizeof
1992 (reiserfs_3_6_magic_string));
1993
1994 set_sb_version(rs, REISERFS_VERSION_2);
1995 reiserfs_convert_objectid_map_v1(s);
1996 set_bit(REISERFS_3_6, &(sbi->s_properties));
1997 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1998 } else if (!silent) {
1999 reiserfs_info(s, "using 3.5.x disk format\n");
2000 }
2001 } else
2002 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2003
2004
2005 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2006 errval = journal_end(&th, s, 1);
2007 if (errval) {
2008 dput(s->s_root);
2009 s->s_root = NULL;
2010 goto error;
2011 }
2012
2013 reiserfs_write_unlock(s);
2014 if ((errval = reiserfs_lookup_privroot(s)) ||
2015 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2016 dput(s->s_root);
2017 s->s_root = NULL;
2018 goto error_unlocked;
2019 }
2020 reiserfs_write_lock(s);
2021
2022 /* look for files which were to be removed in previous session */
2023 finish_unfinished(s);
2024 } else {
2025 if (old_format_only(s) && !silent) {
2026 reiserfs_info(s, "using 3.5.x disk format\n");
2027 }
2028
2029 reiserfs_write_unlock(s);
2030 if ((errval = reiserfs_lookup_privroot(s)) ||
2031 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2032 dput(s->s_root);
2033 s->s_root = NULL;
2034 goto error_unlocked;
2035 }
2036 reiserfs_write_lock(s);
2037 }
2038 // mark hash in super block: it could be unset. overwrite should be ok
2039 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2040
2041 handle_attrs(s);
2042
2043 reiserfs_proc_info_init(s);
2044
2045 init_waitqueue_head(&(sbi->s_wait));
2046 spin_lock_init(&sbi->bitmap_lock);
2047
2048 reiserfs_write_unlock(s);
2049
2050 return (0);
2051
2052 error:
2053 reiserfs_write_unlock(s);
2054
2055 error_unlocked:
2056 /* kill the commit thread, free journal ram */
2057 if (jinit_done) {
2058 reiserfs_write_lock(s);
2059 journal_release_error(NULL, s);
2060 reiserfs_write_unlock(s);
2061 }
2062
2063 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2064
2065 reiserfs_free_bitmap_cache(s);
2066 if (SB_BUFFER_WITH_SB(s))
2067 brelse(SB_BUFFER_WITH_SB(s));
2068 #ifdef CONFIG_QUOTA
2069 {
2070 int j;
2071 for (j = 0; j < MAXQUOTAS; j++)
2072 kfree(qf_names[j]);
2073 }
2074 #endif
2075 kfree(sbi);
2076
2077 s->s_fs_info = NULL;
2078 return errval;
2079 }
2080
2081 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2082 {
2083 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2084
2085 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2086 buf->f_bfree = sb_free_blocks(rs);
2087 buf->f_bavail = buf->f_bfree;
2088 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2089 buf->f_bsize = dentry->d_sb->s_blocksize;
2090 /* changed to accommodate gcc folks. */
2091 buf->f_type = REISERFS_SUPER_MAGIC;
2092 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2093 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2094 sizeof(rs->s_uuid)/2);
2095
2096 return 0;
2097 }
2098
2099 #ifdef CONFIG_QUOTA
2100 static int reiserfs_write_dquot(struct dquot *dquot)
2101 {
2102 struct reiserfs_transaction_handle th;
2103 int ret, err;
2104 int depth;
2105
2106 reiserfs_write_lock(dquot->dq_sb);
2107 ret =
2108 journal_begin(&th, dquot->dq_sb,
2109 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2110 if (ret)
2111 goto out;
2112 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2113 ret = dquot_commit(dquot);
2114 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2115 err =
2116 journal_end(&th, dquot->dq_sb,
2117 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2118 if (!ret && err)
2119 ret = err;
2120 out:
2121 reiserfs_write_unlock(dquot->dq_sb);
2122 return ret;
2123 }
2124
2125 static int reiserfs_acquire_dquot(struct dquot *dquot)
2126 {
2127 struct reiserfs_transaction_handle th;
2128 int ret, err;
2129 int depth;
2130
2131 reiserfs_write_lock(dquot->dq_sb);
2132 ret =
2133 journal_begin(&th, dquot->dq_sb,
2134 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2135 if (ret)
2136 goto out;
2137 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2138 ret = dquot_acquire(dquot);
2139 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2140 err =
2141 journal_end(&th, dquot->dq_sb,
2142 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2143 if (!ret && err)
2144 ret = err;
2145 out:
2146 reiserfs_write_unlock(dquot->dq_sb);
2147 return ret;
2148 }
2149
2150 static int reiserfs_release_dquot(struct dquot *dquot)
2151 {
2152 struct reiserfs_transaction_handle th;
2153 int ret, err;
2154
2155 reiserfs_write_lock(dquot->dq_sb);
2156 ret =
2157 journal_begin(&th, dquot->dq_sb,
2158 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2159 reiserfs_write_unlock(dquot->dq_sb);
2160 if (ret) {
2161 /* Release dquot anyway to avoid endless cycle in dqput() */
2162 dquot_release(dquot);
2163 goto out;
2164 }
2165 ret = dquot_release(dquot);
2166 reiserfs_write_lock(dquot->dq_sb);
2167 err =
2168 journal_end(&th, dquot->dq_sb,
2169 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2170 if (!ret && err)
2171 ret = err;
2172 reiserfs_write_unlock(dquot->dq_sb);
2173 out:
2174 return ret;
2175 }
2176
2177 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2178 {
2179 /* Are we journaling quotas? */
2180 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2181 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2182 dquot_mark_dquot_dirty(dquot);
2183 return reiserfs_write_dquot(dquot);
2184 } else
2185 return dquot_mark_dquot_dirty(dquot);
2186 }
2187
2188 static int reiserfs_write_info(struct super_block *sb, int type)
2189 {
2190 struct reiserfs_transaction_handle th;
2191 int ret, err;
2192 int depth;
2193
2194 /* Data block + inode block */
2195 reiserfs_write_lock(sb);
2196 ret = journal_begin(&th, sb, 2);
2197 if (ret)
2198 goto out;
2199 depth = reiserfs_write_unlock_nested(sb);
2200 ret = dquot_commit_info(sb, type);
2201 reiserfs_write_lock_nested(sb, depth);
2202 err = journal_end(&th, sb, 2);
2203 if (!ret && err)
2204 ret = err;
2205 out:
2206 reiserfs_write_unlock(sb);
2207 return ret;
2208 }
2209
2210 /*
2211 * Turn on quotas during mount time - we need to find the quota file and such...
2212 */
2213 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2214 {
2215 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2216 REISERFS_SB(sb)->s_jquota_fmt, type);
2217 }
2218
2219 /*
2220 * Standard function to be called on quota_on
2221 */
2222 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2223 struct path *path)
2224 {
2225 int err;
2226 struct inode *inode;
2227 struct reiserfs_transaction_handle th;
2228 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2229
2230 reiserfs_write_lock(sb);
2231 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2232 err = -EINVAL;
2233 goto out;
2234 }
2235
2236 /* Quotafile not on the same filesystem? */
2237 if (path->dentry->d_sb != sb) {
2238 err = -EXDEV;
2239 goto out;
2240 }
2241 inode = path->dentry->d_inode;
2242 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2243 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2244 err = reiserfs_unpack(inode, NULL);
2245 if (err) {
2246 reiserfs_warning(sb, "super-6520",
2247 "Unpacking tail of quota file failed"
2248 " (%d). Cannot turn on quotas.", err);
2249 err = -EINVAL;
2250 goto out;
2251 }
2252 mark_inode_dirty(inode);
2253 }
2254 /* Journaling quota? */
2255 if (REISERFS_SB(sb)->s_qf_names[type]) {
2256 /* Quotafile not of fs root? */
2257 if (path->dentry->d_parent != sb->s_root)
2258 reiserfs_warning(sb, "super-6521",
2259 "Quota file not on filesystem root. "
2260 "Journalled quota will not work.");
2261 }
2262
2263 /*
2264 * When we journal data on quota file, we have to flush journal to see
2265 * all updates to the file when we bypass pagecache...
2266 */
2267 if (reiserfs_file_data_log(inode)) {
2268 /* Just start temporary transaction and finish it */
2269 err = journal_begin(&th, sb, 1);
2270 if (err)
2271 goto out;
2272 err = journal_end_sync(&th, sb, 1);
2273 if (err)
2274 goto out;
2275 }
2276 reiserfs_write_unlock(sb);
2277 return dquot_quota_on(sb, type, format_id, path);
2278 out:
2279 reiserfs_write_unlock(sb);
2280 return err;
2281 }
2282
2283 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2284 * acquiring the locks... As quota files are never truncated and quota code
2285 * itself serializes the operations (and no one else should touch the files)
2286 * we don't have to be afraid of races */
2287 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2288 size_t len, loff_t off)
2289 {
2290 struct inode *inode = sb_dqopt(sb)->files[type];
2291 unsigned long blk = off >> sb->s_blocksize_bits;
2292 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2293 size_t toread;
2294 struct buffer_head tmp_bh, *bh;
2295 loff_t i_size = i_size_read(inode);
2296
2297 if (off > i_size)
2298 return 0;
2299 if (off + len > i_size)
2300 len = i_size - off;
2301 toread = len;
2302 while (toread > 0) {
2303 tocopy =
2304 sb->s_blocksize - offset <
2305 toread ? sb->s_blocksize - offset : toread;
2306 tmp_bh.b_state = 0;
2307 /* Quota files are without tails so we can safely use this function */
2308 reiserfs_write_lock(sb);
2309 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2310 reiserfs_write_unlock(sb);
2311 if (err)
2312 return err;
2313 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2314 memset(data, 0, tocopy);
2315 else {
2316 bh = sb_bread(sb, tmp_bh.b_blocknr);
2317 if (!bh)
2318 return -EIO;
2319 memcpy(data, bh->b_data + offset, tocopy);
2320 brelse(bh);
2321 }
2322 offset = 0;
2323 toread -= tocopy;
2324 data += tocopy;
2325 blk++;
2326 }
2327 return len;
2328 }
2329
2330 /* Write to quotafile (we know the transaction is already started and has
2331 * enough credits) */
2332 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2333 const char *data, size_t len, loff_t off)
2334 {
2335 struct inode *inode = sb_dqopt(sb)->files[type];
2336 unsigned long blk = off >> sb->s_blocksize_bits;
2337 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2338 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2339 size_t towrite = len;
2340 struct buffer_head tmp_bh, *bh;
2341
2342 if (!current->journal_info) {
2343 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2344 " cancelled because transaction is not started.\n",
2345 (unsigned long long)off, (unsigned long long)len);
2346 return -EIO;
2347 }
2348 while (towrite > 0) {
2349 tocopy = sb->s_blocksize - offset < towrite ?
2350 sb->s_blocksize - offset : towrite;
2351 tmp_bh.b_state = 0;
2352 reiserfs_write_lock(sb);
2353 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2354 reiserfs_write_unlock(sb);
2355 if (err)
2356 goto out;
2357 if (offset || tocopy != sb->s_blocksize)
2358 bh = sb_bread(sb, tmp_bh.b_blocknr);
2359 else
2360 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2361 if (!bh) {
2362 err = -EIO;
2363 goto out;
2364 }
2365 lock_buffer(bh);
2366 memcpy(bh->b_data + offset, data, tocopy);
2367 flush_dcache_page(bh->b_page);
2368 set_buffer_uptodate(bh);
2369 unlock_buffer(bh);
2370 reiserfs_write_lock(sb);
2371 reiserfs_prepare_for_journal(sb, bh, 1);
2372 journal_mark_dirty(current->journal_info, sb, bh);
2373 if (!journal_quota)
2374 reiserfs_add_ordered_list(inode, bh);
2375 reiserfs_write_unlock(sb);
2376 brelse(bh);
2377 offset = 0;
2378 towrite -= tocopy;
2379 data += tocopy;
2380 blk++;
2381 }
2382 out:
2383 if (len == towrite)
2384 return err;
2385 if (inode->i_size < off + len - towrite)
2386 i_size_write(inode, off + len - towrite);
2387 inode->i_version++;
2388 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2389 mark_inode_dirty(inode);
2390 return len - towrite;
2391 }
2392
2393 #endif
2394
2395 static struct dentry *get_super_block(struct file_system_type *fs_type,
2396 int flags, const char *dev_name,
2397 void *data)
2398 {
2399 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2400 }
2401
2402 static int __init init_reiserfs_fs(void)
2403 {
2404 int ret;
2405
2406 if ((ret = init_inodecache())) {
2407 return ret;
2408 }
2409
2410 reiserfs_proc_info_global_init();
2411
2412 ret = register_filesystem(&reiserfs_fs_type);
2413
2414 if (ret == 0) {
2415 return 0;
2416 }
2417
2418 reiserfs_proc_info_global_done();
2419 destroy_inodecache();
2420
2421 return ret;
2422 }
2423
2424 static void __exit exit_reiserfs_fs(void)
2425 {
2426 reiserfs_proc_info_global_done();
2427 unregister_filesystem(&reiserfs_fs_type);
2428 destroy_inodecache();
2429 }
2430
2431 struct file_system_type reiserfs_fs_type = {
2432 .owner = THIS_MODULE,
2433 .name = "reiserfs",
2434 .mount = get_super_block,
2435 .kill_sb = reiserfs_kill_sb,
2436 .fs_flags = FS_REQUIRES_DEV,
2437 };
2438 MODULE_ALIAS_FS("reiserfs");
2439
2440 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2441 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2442 MODULE_LICENSE("GPL");
2443
2444 module_init(init_reiserfs_fs);
2445 module_exit(exit_reiserfs_fs);
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