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Linux 4.2.1
[linux/fpc-iii.git] / fs / reiserfs / super.c
blob4a62fe8cc3bff619516fbe15d62a8cfaa1aaa581
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <linux/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/backing-dev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/exportfs.h>
27 #include <linux/quotaops.h>
28 #include <linux/vfs.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/crc32.h>
32 #include <linux/seq_file.h>
33
34 struct file_system_type reiserfs_fs_type;
35
36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 {
42 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
43 strlen(reiserfs_3_5_magic_string));
44 }
45
46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 {
48 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
49 strlen(reiserfs_3_6_magic_string));
50 }
51
52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 {
54 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
55 strlen(reiserfs_jr_magic_string));
56 }
57
58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 {
60 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
61 is_reiserfs_jr(rs));
62 }
63
64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66
67 static int reiserfs_sync_fs(struct super_block *s, int wait)
68 {
69 struct reiserfs_transaction_handle th;
70
71 /*
72 * Writeback quota in non-journalled quota case - journalled quota has
73 * no dirty dquots
74 */
75 dquot_writeback_dquots(s, -1);
76 reiserfs_write_lock(s);
77 if (!journal_begin(&th, s, 1))
78 if (!journal_end_sync(&th))
79 reiserfs_flush_old_commits(s);
80 reiserfs_write_unlock(s);
81 return 0;
82 }
83
84 static void flush_old_commits(struct work_struct *work)
85 {
86 struct reiserfs_sb_info *sbi;
87 struct super_block *s;
88
89 sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
90 s = sbi->s_journal->j_work_sb;
91
92 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 /*
105 * Avoid scheduling flush when sb is being shut down. It can race
106 * with journal shutdown and free still queued delayed work.
107 */
108 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
109 return;
110
111 spin_lock(&sbi->old_work_lock);
112 if (!sbi->work_queued) {
113 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
114 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
115 sbi->work_queued = 1;
116 }
117 spin_unlock(&sbi->old_work_lock);
118 }
119
120 static void cancel_old_flush(struct super_block *s)
121 {
122 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
123
124 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
125 spin_lock(&sbi->old_work_lock);
126 sbi->work_queued = 0;
127 spin_unlock(&sbi->old_work_lock);
128 }
129
130 static int reiserfs_freeze(struct super_block *s)
131 {
132 struct reiserfs_transaction_handle th;
133
134 cancel_old_flush(s);
135
136 reiserfs_write_lock(s);
137 if (!(s->s_flags & MS_RDONLY)) {
138 int err = journal_begin(&th, s, 1);
139 if (err) {
140 reiserfs_block_writes(&th);
141 } else {
142 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
143 1);
144 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
145 reiserfs_block_writes(&th);
146 journal_end_sync(&th);
147 }
148 }
149 reiserfs_write_unlock(s);
150 return 0;
151 }
152
153 static int reiserfs_unfreeze(struct super_block *s)
154 {
155 reiserfs_allow_writes(s);
156 return 0;
157 }
158
159 extern const struct in_core_key MAX_IN_CORE_KEY;
160
161 /*
162 * this is used to delete "save link" when there are no items of a
163 * file it points to. It can either happen if unlink is completed but
164 * "save unlink" removal, or if file has both unlink and truncate
165 * pending and as unlink completes first (because key of "save link"
166 * protecting unlink is bigger that a key lf "save link" which
167 * protects truncate), so there left no items to make truncate
168 * completion on
169 */
170 static int remove_save_link_only(struct super_block *s,
171 struct reiserfs_key *key, int oid_free)
172 {
173 struct reiserfs_transaction_handle th;
174 int err;
175
176 /* we are going to do one balancing */
177 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
178 if (err)
179 return err;
180
181 reiserfs_delete_solid_item(&th, NULL, key);
182 if (oid_free)
183 /* removals are protected by direct items */
184 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
185
186 return journal_end(&th);
187 }
188
189 #ifdef CONFIG_QUOTA
190 static int reiserfs_quota_on_mount(struct super_block *, int);
191 #endif
192
193 /* look for uncompleted unlinks and truncates and complete them */
194 static int finish_unfinished(struct super_block *s)
195 {
196 INITIALIZE_PATH(path);
197 struct cpu_key max_cpu_key, obj_key;
198 struct reiserfs_key save_link_key, last_inode_key;
199 int retval = 0;
200 struct item_head *ih;
201 struct buffer_head *bh;
202 int item_pos;
203 char *item;
204 int done;
205 struct inode *inode;
206 int truncate;
207 #ifdef CONFIG_QUOTA
208 int i;
209 int ms_active_set;
210 int quota_enabled[REISERFS_MAXQUOTAS];
211 #endif
212
213 /* compose key to look for "save" links */
214 max_cpu_key.version = KEY_FORMAT_3_5;
215 max_cpu_key.on_disk_key.k_dir_id = ~0U;
216 max_cpu_key.on_disk_key.k_objectid = ~0U;
217 set_cpu_key_k_offset(&max_cpu_key, ~0U);
218 max_cpu_key.key_length = 3;
219
220 memset(&last_inode_key, 0, sizeof(last_inode_key));
221
222 #ifdef CONFIG_QUOTA
223 /* Needed for iput() to work correctly and not trash data */
224 if (s->s_flags & MS_ACTIVE) {
225 ms_active_set = 0;
226 } else {
227 ms_active_set = 1;
228 s->s_flags |= MS_ACTIVE;
229 }
230 /* Turn on quotas so that they are updated correctly */
231 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
232 quota_enabled[i] = 1;
233 if (REISERFS_SB(s)->s_qf_names[i]) {
234 int ret;
235
236 if (sb_has_quota_active(s, i)) {
237 quota_enabled[i] = 0;
238 continue;
239 }
240 ret = reiserfs_quota_on_mount(s, i);
241 if (ret < 0)
242 reiserfs_warning(s, "reiserfs-2500",
243 "cannot turn on journaled "
244 "quota: error %d", ret);
245 }
246 }
247 #endif
248
249 done = 0;
250 REISERFS_SB(s)->s_is_unlinked_ok = 1;
251 while (!retval) {
252 int depth;
253 retval = search_item(s, &max_cpu_key, &path);
254 if (retval != ITEM_NOT_FOUND) {
255 reiserfs_error(s, "vs-2140",
256 "search_by_key returned %d", retval);
257 break;
258 }
259
260 bh = get_last_bh(&path);
261 item_pos = get_item_pos(&path);
262 if (item_pos != B_NR_ITEMS(bh)) {
263 reiserfs_warning(s, "vs-2060",
264 "wrong position found");
265 break;
266 }
267 item_pos--;
268 ih = item_head(bh, item_pos);
269
270 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
271 /* there are no "save" links anymore */
272 break;
273
274 save_link_key = ih->ih_key;
275 if (is_indirect_le_ih(ih))
276 truncate = 1;
277 else
278 truncate = 0;
279
280 /* reiserfs_iget needs k_dirid and k_objectid only */
281 item = ih_item_body(bh, ih);
282 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
283 obj_key.on_disk_key.k_objectid =
284 le32_to_cpu(ih->ih_key.k_objectid);
285 obj_key.on_disk_key.k_offset = 0;
286 obj_key.on_disk_key.k_type = 0;
287
288 pathrelse(&path);
289
290 inode = reiserfs_iget(s, &obj_key);
291 if (!inode) {
292 /*
293 * the unlink almost completed, it just did not
294 * manage to remove "save" link and release objectid
295 */
296 reiserfs_warning(s, "vs-2180", "iget failed for %K",
297 &obj_key);
298 retval = remove_save_link_only(s, &save_link_key, 1);
299 continue;
300 }
301
302 if (!truncate && inode->i_nlink) {
303 /* file is not unlinked */
304 reiserfs_warning(s, "vs-2185",
305 "file %K is not unlinked",
306 &obj_key);
307 retval = remove_save_link_only(s, &save_link_key, 0);
308 continue;
309 }
310 depth = reiserfs_write_unlock_nested(inode->i_sb);
311 dquot_initialize(inode);
312 reiserfs_write_lock_nested(inode->i_sb, depth);
313
314 if (truncate && S_ISDIR(inode->i_mode)) {
315 /*
316 * We got a truncate request for a dir which
317 * is impossible. The only imaginable way is to
318 * execute unfinished truncate request then boot
319 * into old kernel, remove the file and create dir
320 * with the same key.
321 */
322 reiserfs_warning(s, "green-2101",
323 "impossible truncate on a "
324 "directory %k. Please report",
325 INODE_PKEY(inode));
326 retval = remove_save_link_only(s, &save_link_key, 0);
327 truncate = 0;
328 iput(inode);
329 continue;
330 }
331
332 if (truncate) {
333 REISERFS_I(inode)->i_flags |=
334 i_link_saved_truncate_mask;
335 /*
336 * not completed truncate found. New size was
337 * committed together with "save" link
338 */
339 reiserfs_info(s, "Truncating %k to %lld ..",
340 INODE_PKEY(inode), inode->i_size);
341
342 /* don't update modification time */
343 reiserfs_truncate_file(inode, 0);
344
345 retval = remove_save_link(inode, truncate);
346 } else {
347 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
348 /* not completed unlink (rmdir) found */
349 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
350 if (memcmp(&last_inode_key, INODE_PKEY(inode),
351 sizeof(last_inode_key))){
352 last_inode_key = *INODE_PKEY(inode);
353 /* removal gets completed in iput */
354 retval = 0;
355 } else {
356 reiserfs_warning(s, "super-2189", "Dead loop "
357 "in finish_unfinished "
358 "detected, just remove "
359 "save link\n");
360 retval = remove_save_link_only(s,
361 &save_link_key, 0);
362 }
363 }
364
365 iput(inode);
366 printk("done\n");
367 done++;
368 }
369 REISERFS_SB(s)->s_is_unlinked_ok = 0;
370
371 #ifdef CONFIG_QUOTA
372 /* Turn quotas off */
373 reiserfs_write_unlock(s);
374 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
375 if (sb_dqopt(s)->files[i] && quota_enabled[i])
376 dquot_quota_off(s, i);
377 }
378 reiserfs_write_lock(s);
379 if (ms_active_set)
380 /* Restore the flag back */
381 s->s_flags &= ~MS_ACTIVE;
382 #endif
383 pathrelse(&path);
384 if (done)
385 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
386 "Completed\n", done);
387 return retval;
388 }
389
390 /*
391 * to protect file being unlinked from getting lost we "safe" link files
392 * being unlinked. This link will be deleted in the same transaction with last
393 * item of file. mounting the filesystem we scan all these links and remove
394 * files which almost got lost
395 */
396 void add_save_link(struct reiserfs_transaction_handle *th,
397 struct inode *inode, int truncate)
398 {
399 INITIALIZE_PATH(path);
400 int retval;
401 struct cpu_key key;
402 struct item_head ih;
403 __le32 link;
404
405 BUG_ON(!th->t_trans_id);
406
407 /* file can only get one "save link" of each kind */
408 RFALSE(truncate &&
409 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
410 "saved link already exists for truncated inode %lx",
411 (long)inode->i_ino);
412 RFALSE(!truncate &&
413 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
414 "saved link already exists for unlinked inode %lx",
415 (long)inode->i_ino);
416
417 /* setup key of "save" link */
418 key.version = KEY_FORMAT_3_5;
419 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
420 key.on_disk_key.k_objectid = inode->i_ino;
421 if (!truncate) {
422 /* unlink, rmdir, rename */
423 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
424 set_cpu_key_k_type(&key, TYPE_DIRECT);
425
426 /* item head of "safe" link */
427 make_le_item_head(&ih, &key, key.version,
428 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
429 4 /*length */ , 0xffff /*free space */ );
430 } else {
431 /* truncate */
432 if (S_ISDIR(inode->i_mode))
433 reiserfs_warning(inode->i_sb, "green-2102",
434 "Adding a truncate savelink for "
435 "a directory %k! Please report",
436 INODE_PKEY(inode));
437 set_cpu_key_k_offset(&key, 1);
438 set_cpu_key_k_type(&key, TYPE_INDIRECT);
439
440 /* item head of "safe" link */
441 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
442 4 /*length */ , 0 /*free space */ );
443 }
444 key.key_length = 3;
445
446 /* look for its place in the tree */
447 retval = search_item(inode->i_sb, &key, &path);
448 if (retval != ITEM_NOT_FOUND) {
449 if (retval != -ENOSPC)
450 reiserfs_error(inode->i_sb, "vs-2100",
451 "search_by_key (%K) returned %d", &key,
452 retval);
453 pathrelse(&path);
454 return;
455 }
456
457 /* body of "save" link */
458 link = INODE_PKEY(inode)->k_dir_id;
459
460 /* put "save" link into tree, don't charge quota to anyone */
461 retval =
462 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
463 if (retval) {
464 if (retval != -ENOSPC)
465 reiserfs_error(inode->i_sb, "vs-2120",
466 "insert_item returned %d", retval);
467 } else {
468 if (truncate)
469 REISERFS_I(inode)->i_flags |=
470 i_link_saved_truncate_mask;
471 else
472 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
473 }
474 }
475
476 /* this opens transaction unlike add_save_link */
477 int remove_save_link(struct inode *inode, int truncate)
478 {
479 struct reiserfs_transaction_handle th;
480 struct reiserfs_key key;
481 int err;
482
483 /* we are going to do one balancing only */
484 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
485 if (err)
486 return err;
487
488 /* setup key of "save" link */
489 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
490 key.k_objectid = INODE_PKEY(inode)->k_objectid;
491 if (!truncate) {
492 /* unlink, rmdir, rename */
493 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
494 1 + inode->i_sb->s_blocksize);
495 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
496 } else {
497 /* truncate */
498 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
499 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
500 }
501
502 if ((truncate &&
503 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
504 (!truncate &&
505 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
506 /* don't take quota bytes from anywhere */
507 reiserfs_delete_solid_item(&th, NULL, &key);
508 if (!truncate) {
509 reiserfs_release_objectid(&th, inode->i_ino);
510 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
511 } else
512 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
513
514 return journal_end(&th);
515 }
516
517 static void reiserfs_kill_sb(struct super_block *s)
518 {
519 if (REISERFS_SB(s)) {
520 reiserfs_proc_info_done(s);
521 /*
522 * Force any pending inode evictions to occur now. Any
523 * inodes to be removed that have extended attributes
524 * associated with them need to clean them up before
525 * we can release the extended attribute root dentries.
526 * shrink_dcache_for_umount will BUG if we don't release
527 * those before it's called so ->put_super is too late.
528 */
529 shrink_dcache_sb(s);
530
531 dput(REISERFS_SB(s)->xattr_root);
532 REISERFS_SB(s)->xattr_root = NULL;
533 dput(REISERFS_SB(s)->priv_root);
534 REISERFS_SB(s)->priv_root = NULL;
535 }
536
537 kill_block_super(s);
538 }
539
540 static void reiserfs_put_super(struct super_block *s)
541 {
542 struct reiserfs_transaction_handle th;
543 th.t_trans_id = 0;
544
545 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
546
547 reiserfs_write_lock(s);
548
549 /*
550 * change file system state to current state if it was mounted
551 * with read-write permissions
552 */
553 if (!(s->s_flags & MS_RDONLY)) {
554 if (!journal_begin(&th, s, 10)) {
555 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
556 1);
557 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
558 REISERFS_SB(s)->s_mount_state);
559 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
560 }
561 }
562
563 /*
564 * note, journal_release checks for readonly mount, and can
565 * decide not to do a journal_end
566 */
567 journal_release(&th, s);
568
569 reiserfs_free_bitmap_cache(s);
570
571 brelse(SB_BUFFER_WITH_SB(s));
572
573 print_statistics(s);
574
575 if (REISERFS_SB(s)->reserved_blocks != 0) {
576 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
577 REISERFS_SB(s)->reserved_blocks);
578 }
579
580 reiserfs_write_unlock(s);
581 mutex_destroy(&REISERFS_SB(s)->lock);
582 destroy_workqueue(REISERFS_SB(s)->commit_wq);
583 kfree(s->s_fs_info);
584 s->s_fs_info = NULL;
585 }
586
587 static struct kmem_cache *reiserfs_inode_cachep;
588
589 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
590 {
591 struct reiserfs_inode_info *ei;
592 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
593 if (!ei)
594 return NULL;
595 atomic_set(&ei->openers, 0);
596 mutex_init(&ei->tailpack);
597 #ifdef CONFIG_QUOTA
598 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
599 #endif
600
601 return &ei->vfs_inode;
602 }
603
604 static void reiserfs_i_callback(struct rcu_head *head)
605 {
606 struct inode *inode = container_of(head, struct inode, i_rcu);
607 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
608 }
609
610 static void reiserfs_destroy_inode(struct inode *inode)
611 {
612 call_rcu(&inode->i_rcu, reiserfs_i_callback);
613 }
614
615 static void init_once(void *foo)
616 {
617 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
618
619 INIT_LIST_HEAD(&ei->i_prealloc_list);
620 inode_init_once(&ei->vfs_inode);
621 }
622
623 static int __init init_inodecache(void)
624 {
625 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
626 sizeof(struct
627 reiserfs_inode_info),
628 0, (SLAB_RECLAIM_ACCOUNT|
629 SLAB_MEM_SPREAD),
630 init_once);
631 if (reiserfs_inode_cachep == NULL)
632 return -ENOMEM;
633 return 0;
634 }
635
636 static void destroy_inodecache(void)
637 {
638 /*
639 * Make sure all delayed rcu free inodes are flushed before we
640 * destroy cache.
641 */
642 rcu_barrier();
643 kmem_cache_destroy(reiserfs_inode_cachep);
644 }
645
646 /* we don't mark inodes dirty, we just log them */
647 static void reiserfs_dirty_inode(struct inode *inode, int flags)
648 {
649 struct reiserfs_transaction_handle th;
650
651 int err = 0;
652
653 if (inode->i_sb->s_flags & MS_RDONLY) {
654 reiserfs_warning(inode->i_sb, "clm-6006",
655 "writing inode %lu on readonly FS",
656 inode->i_ino);
657 return;
658 }
659 reiserfs_write_lock(inode->i_sb);
660
661 /*
662 * this is really only used for atime updates, so they don't have
663 * to be included in O_SYNC or fsync
664 */
665 err = journal_begin(&th, inode->i_sb, 1);
666 if (err)
667 goto out;
668
669 reiserfs_update_sd(&th, inode);
670 journal_end(&th);
671
672 out:
673 reiserfs_write_unlock(inode->i_sb);
674 }
675
676 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
677 {
678 struct super_block *s = root->d_sb;
679 struct reiserfs_journal *journal = SB_JOURNAL(s);
680 long opts = REISERFS_SB(s)->s_mount_opt;
681
682 if (opts & (1 << REISERFS_LARGETAIL))
683 seq_puts(seq, ",tails=on");
684 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
685 seq_puts(seq, ",notail");
686 /* tails=small is default so we don't show it */
687
688 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
689 seq_puts(seq, ",barrier=none");
690 /* barrier=flush is default so we don't show it */
691
692 if (opts & (1 << REISERFS_ERROR_CONTINUE))
693 seq_puts(seq, ",errors=continue");
694 else if (opts & (1 << REISERFS_ERROR_PANIC))
695 seq_puts(seq, ",errors=panic");
696 /* errors=ro is default so we don't show it */
697
698 if (opts & (1 << REISERFS_DATA_LOG))
699 seq_puts(seq, ",data=journal");
700 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
701 seq_puts(seq, ",data=writeback");
702 /* data=ordered is default so we don't show it */
703
704 if (opts & (1 << REISERFS_ATTRS))
705 seq_puts(seq, ",attrs");
706
707 if (opts & (1 << REISERFS_XATTRS_USER))
708 seq_puts(seq, ",user_xattr");
709
710 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
711 seq_puts(seq, ",expose_privroot");
712
713 if (opts & (1 << REISERFS_POSIXACL))
714 seq_puts(seq, ",acl");
715
716 if (REISERFS_SB(s)->s_jdev)
717 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
718
719 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
720 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
721
722 #ifdef CONFIG_QUOTA
723 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
724 seq_show_option(seq, "usrjquota",
725 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
726 else if (opts & (1 << REISERFS_USRQUOTA))
727 seq_puts(seq, ",usrquota");
728 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
729 seq_show_option(seq, "grpjquota",
730 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
731 else if (opts & (1 << REISERFS_GRPQUOTA))
732 seq_puts(seq, ",grpquota");
733 if (REISERFS_SB(s)->s_jquota_fmt) {
734 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
735 seq_puts(seq, ",jqfmt=vfsold");
736 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
737 seq_puts(seq, ",jqfmt=vfsv0");
738 }
739 #endif
740
741 /* Block allocator options */
742 if (opts & (1 << REISERFS_NO_BORDER))
743 seq_puts(seq, ",block-allocator=noborder");
744 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
745 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
746 if (opts & (1 << REISERFS_HASHED_RELOCATION))
747 seq_puts(seq, ",block-allocator=hashed_relocation");
748 if (opts & (1 << REISERFS_TEST4))
749 seq_puts(seq, ",block-allocator=test4");
750 show_alloc_options(seq, s);
751 return 0;
752 }
753
754 #ifdef CONFIG_QUOTA
755 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
756 size_t, loff_t);
757 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
758 loff_t);
759
760 static struct dquot **reiserfs_get_dquots(struct inode *inode)
761 {
762 return REISERFS_I(inode)->i_dquot;
763 }
764 #endif
765
766 static const struct super_operations reiserfs_sops = {
767 .alloc_inode = reiserfs_alloc_inode,
768 .destroy_inode = reiserfs_destroy_inode,
769 .write_inode = reiserfs_write_inode,
770 .dirty_inode = reiserfs_dirty_inode,
771 .evict_inode = reiserfs_evict_inode,
772 .put_super = reiserfs_put_super,
773 .sync_fs = reiserfs_sync_fs,
774 .freeze_fs = reiserfs_freeze,
775 .unfreeze_fs = reiserfs_unfreeze,
776 .statfs = reiserfs_statfs,
777 .remount_fs = reiserfs_remount,
778 .show_options = reiserfs_show_options,
779 #ifdef CONFIG_QUOTA
780 .quota_read = reiserfs_quota_read,
781 .quota_write = reiserfs_quota_write,
782 .get_dquots = reiserfs_get_dquots,
783 #endif
784 };
785
786 #ifdef CONFIG_QUOTA
787 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
788
789 static int reiserfs_write_dquot(struct dquot *);
790 static int reiserfs_acquire_dquot(struct dquot *);
791 static int reiserfs_release_dquot(struct dquot *);
792 static int reiserfs_mark_dquot_dirty(struct dquot *);
793 static int reiserfs_write_info(struct super_block *, int);
794 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
795
796 static const struct dquot_operations reiserfs_quota_operations = {
797 .write_dquot = reiserfs_write_dquot,
798 .acquire_dquot = reiserfs_acquire_dquot,
799 .release_dquot = reiserfs_release_dquot,
800 .mark_dirty = reiserfs_mark_dquot_dirty,
801 .write_info = reiserfs_write_info,
802 .alloc_dquot = dquot_alloc,
803 .destroy_dquot = dquot_destroy,
804 };
805
806 static const struct quotactl_ops reiserfs_qctl_operations = {
807 .quota_on = reiserfs_quota_on,
808 .quota_off = dquot_quota_off,
809 .quota_sync = dquot_quota_sync,
810 .get_state = dquot_get_state,
811 .set_info = dquot_set_dqinfo,
812 .get_dqblk = dquot_get_dqblk,
813 .set_dqblk = dquot_set_dqblk,
814 };
815 #endif
816
817 static const struct export_operations reiserfs_export_ops = {
818 .encode_fh = reiserfs_encode_fh,
819 .fh_to_dentry = reiserfs_fh_to_dentry,
820 .fh_to_parent = reiserfs_fh_to_parent,
821 .get_parent = reiserfs_get_parent,
822 };
823
824 /*
825 * this struct is used in reiserfs_getopt () for containing the value for
826 * those mount options that have values rather than being toggles.
827 */
828 typedef struct {
829 char *value;
830 /*
831 * bitmask which is to set on mount_options bitmask
832 * when this value is found, 0 is no bits are to be changed.
833 */
834 int setmask;
835 /*
836 * bitmask which is to clear on mount_options bitmask
837 * when this value is found, 0 is no bits are to be changed.
838 * This is applied BEFORE setmask
839 */
840 int clrmask;
841 } arg_desc_t;
842
843 /* Set this bit in arg_required to allow empty arguments */
844 #define REISERFS_OPT_ALLOWEMPTY 31
845
846 /*
847 * this struct is used in reiserfs_getopt() for describing the
848 * set of reiserfs mount options
849 */
850 typedef struct {
851 char *option_name;
852
853 /* 0 if argument is not required, not 0 otherwise */
854 int arg_required;
855
856 /* list of values accepted by an option */
857 const arg_desc_t *values;
858
859 /*
860 * bitmask which is to set on mount_options bitmask
861 * when this value is found, 0 is no bits are to be changed.
862 */
863 int setmask;
864
865 /*
866 * bitmask which is to clear on mount_options bitmask
867 * when this value is found, 0 is no bits are to be changed.
868 * This is applied BEFORE setmask
869 */
870 int clrmask;
871 } opt_desc_t;
872
873 /* possible values for -o data= */
874 static const arg_desc_t logging_mode[] = {
875 {"ordered", 1 << REISERFS_DATA_ORDERED,
876 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
877 {"journal", 1 << REISERFS_DATA_LOG,
878 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
879 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
880 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
881 {.value = NULL}
882 };
883
884 /* possible values for -o barrier= */
885 static const arg_desc_t barrier_mode[] = {
886 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
887 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
888 {.value = NULL}
889 };
890
891 /*
892 * possible values for "-o block-allocator=" and bits which are to be set in
893 * s_mount_opt of reiserfs specific part of in-core super block
894 */
895 static const arg_desc_t balloc[] = {
896 {"noborder", 1 << REISERFS_NO_BORDER, 0},
897 {"border", 0, 1 << REISERFS_NO_BORDER},
898 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
899 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
900 {"test4", 1 << REISERFS_TEST4, 0},
901 {"notest4", 0, 1 << REISERFS_TEST4},
902 {NULL, 0, 0}
903 };
904
905 static const arg_desc_t tails[] = {
906 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
907 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
908 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
909 {NULL, 0, 0}
910 };
911
912 static const arg_desc_t error_actions[] = {
913 {"panic", 1 << REISERFS_ERROR_PANIC,
914 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
915 {"ro-remount", 1 << REISERFS_ERROR_RO,
916 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
917 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
918 {"continue", 1 << REISERFS_ERROR_CONTINUE,
919 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
920 #endif
921 {NULL, 0, 0},
922 };
923
924 /*
925 * proceed only one option from a list *cur - string containing of mount
926 * options
927 * opts - array of options which are accepted
928 * opt_arg - if option is found and requires an argument and if it is specifed
929 * in the input - pointer to the argument is stored here
930 * bit_flags - if option requires to set a certain bit - it is set here
931 * return -1 if unknown option is found, opt->arg_required otherwise
932 */
933 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
934 char **opt_arg, unsigned long *bit_flags)
935 {
936 char *p;
937 /*
938 * foo=bar,
939 * ^ ^ ^
940 * | | +-- option_end
941 * | +-- arg_start
942 * +-- option_start
943 */
944 const opt_desc_t *opt;
945 const arg_desc_t *arg;
946
947 p = *cur;
948
949 /* assume argument cannot contain commas */
950 *cur = strchr(p, ',');
951 if (*cur) {
952 *(*cur) = '\0';
953 (*cur)++;
954 }
955
956 if (!strncmp(p, "alloc=", 6)) {
957 /*
958 * Ugly special case, probably we should redo options
959 * parser so that it can understand several arguments for
960 * some options, also so that it can fill several bitfields
961 * with option values.
962 */
963 if (reiserfs_parse_alloc_options(s, p + 6)) {
964 return -1;
965 } else {
966 return 0;
967 }
968 }
969
970 /* for every option in the list */
971 for (opt = opts; opt->option_name; opt++) {
972 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
973 if (bit_flags) {
974 if (opt->clrmask ==
975 (1 << REISERFS_UNSUPPORTED_OPT))
976 reiserfs_warning(s, "super-6500",
977 "%s not supported.\n",
978 p);
979 else
980 *bit_flags &= ~opt->clrmask;
981 if (opt->setmask ==
982 (1 << REISERFS_UNSUPPORTED_OPT))
983 reiserfs_warning(s, "super-6501",
984 "%s not supported.\n",
985 p);
986 else
987 *bit_flags |= opt->setmask;
988 }
989 break;
990 }
991 }
992 if (!opt->option_name) {
993 reiserfs_warning(s, "super-6502",
994 "unknown mount option \"%s\"", p);
995 return -1;
996 }
997
998 p += strlen(opt->option_name);
999 switch (*p) {
1000 case '=':
1001 if (!opt->arg_required) {
1002 reiserfs_warning(s, "super-6503",
1003 "the option \"%s\" does not "
1004 "require an argument\n",
1005 opt->option_name);
1006 return -1;
1007 }
1008 break;
1009
1010 case 0:
1011 if (opt->arg_required) {
1012 reiserfs_warning(s, "super-6504",
1013 "the option \"%s\" requires an "
1014 "argument\n", opt->option_name);
1015 return -1;
1016 }
1017 break;
1018 default:
1019 reiserfs_warning(s, "super-6505",
1020 "head of option \"%s\" is only correct\n",
1021 opt->option_name);
1022 return -1;
1023 }
1024
1025 /*
1026 * move to the argument, or to next option if argument is not
1027 * required
1028 */
1029 p++;
1030
1031 if (opt->arg_required
1032 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1033 && !strlen(p)) {
1034 /* this catches "option=," if not allowed */
1035 reiserfs_warning(s, "super-6506",
1036 "empty argument for \"%s\"\n",
1037 opt->option_name);
1038 return -1;
1039 }
1040
1041 if (!opt->values) {
1042 /* *=NULLopt_arg contains pointer to argument */
1043 *opt_arg = p;
1044 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1045 }
1046
1047 /* values possible for this option are listed in opt->values */
1048 for (arg = opt->values; arg->value; arg++) {
1049 if (!strcmp(p, arg->value)) {
1050 if (bit_flags) {
1051 *bit_flags &= ~arg->clrmask;
1052 *bit_flags |= arg->setmask;
1053 }
1054 return opt->arg_required;
1055 }
1056 }
1057
1058 reiserfs_warning(s, "super-6506",
1059 "bad value \"%s\" for option \"%s\"\n", p,
1060 opt->option_name);
1061 return -1;
1062 }
1063
1064 /* returns 0 if something is wrong in option string, 1 - otherwise */
1065 static int reiserfs_parse_options(struct super_block *s,
1066
1067 /* string given via mount's -o */
1068 char *options,
1069
1070 /*
1071 * after the parsing phase, contains the
1072 * collection of bitflags defining what
1073 * mount options were selected.
1074 */
1075 unsigned long *mount_options,
1076
1077 /* strtol-ed from NNN of resize=NNN */
1078 unsigned long *blocks,
1079 char **jdev_name,
1080 unsigned int *commit_max_age,
1081 char **qf_names,
1082 unsigned int *qfmt)
1083 {
1084 int c;
1085 char *arg = NULL;
1086 char *pos;
1087 opt_desc_t opts[] = {
1088 /*
1089 * Compatibility stuff, so that -o notail for old
1090 * setups still work
1091 */
1092 {"tails",.arg_required = 't',.values = tails},
1093 {"notail",.clrmask =
1094 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1095 {"conv",.setmask = 1 << REISERFS_CONVERT},
1096 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1097 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1098 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1099 #ifdef CONFIG_REISERFS_FS_XATTR
1100 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1101 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1102 #else
1103 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1104 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1105 #endif
1106 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1107 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1108 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1109 #else
1110 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1111 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1112 #endif
1113 {.option_name = "nolog"},
1114 {"replayonly",.setmask = 1 << REPLAYONLY},
1115 {"block-allocator",.arg_required = 'a',.values = balloc},
1116 {"data",.arg_required = 'd',.values = logging_mode},
1117 {"barrier",.arg_required = 'b',.values = barrier_mode},
1118 {"resize",.arg_required = 'r',.values = NULL},
1119 {"jdev",.arg_required = 'j',.values = NULL},
1120 {"nolargeio",.arg_required = 'w',.values = NULL},
1121 {"commit",.arg_required = 'c',.values = NULL},
1122 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1123 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1124 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1125 {"errors",.arg_required = 'e',.values = error_actions},
1126 {"usrjquota",.arg_required =
1127 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1128 {"grpjquota",.arg_required =
1129 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1130 {"jqfmt",.arg_required = 'f',.values = NULL},
1131 {.option_name = NULL}
1132 };
1133
1134 *blocks = 0;
1135 if (!options || !*options)
1136 /*
1137 * use default configuration: create tails, journaling on, no
1138 * conversion to newest format
1139 */
1140 return 1;
1141
1142 for (pos = options; pos;) {
1143 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1144 if (c == -1)
1145 /* wrong option is given */
1146 return 0;
1147
1148 if (c == 'r') {
1149 char *p;
1150
1151 p = NULL;
1152 /* "resize=NNN" or "resize=auto" */
1153
1154 if (!strcmp(arg, "auto")) {
1155 /* From JFS code, to auto-get the size. */
1156 *blocks =
1157 s->s_bdev->bd_inode->i_size >> s->
1158 s_blocksize_bits;
1159 } else {
1160 *blocks = simple_strtoul(arg, &p, 0);
1161 if (*p != '\0') {
1162 /* NNN does not look like a number */
1163 reiserfs_warning(s, "super-6507",
1164 "bad value %s for "
1165 "-oresize\n", arg);
1166 return 0;
1167 }
1168 }
1169 }
1170
1171 if (c == 'c') {
1172 char *p = NULL;
1173 unsigned long val = simple_strtoul(arg, &p, 0);
1174 /* commit=NNN (time in seconds) */
1175 if (*p != '\0' || val >= (unsigned int)-1) {
1176 reiserfs_warning(s, "super-6508",
1177 "bad value %s for -ocommit\n",
1178 arg);
1179 return 0;
1180 }
1181 *commit_max_age = (unsigned int)val;
1182 }
1183
1184 if (c == 'w') {
1185 reiserfs_warning(s, "super-6509", "nolargeio option "
1186 "is no longer supported");
1187 return 0;
1188 }
1189
1190 if (c == 'j') {
1191 if (arg && *arg && jdev_name) {
1192 /* Hm, already assigned? */
1193 if (*jdev_name) {
1194 reiserfs_warning(s, "super-6510",
1195 "journal device was "
1196 "already specified to "
1197 "be %s", *jdev_name);
1198 return 0;
1199 }
1200 *jdev_name = arg;
1201 }
1202 }
1203 #ifdef CONFIG_QUOTA
1204 if (c == 'u' || c == 'g') {
1205 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1206
1207 if (sb_any_quota_loaded(s) &&
1208 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1209 reiserfs_warning(s, "super-6511",
1210 "cannot change journaled "
1211 "quota options when quota "
1212 "turned on.");
1213 return 0;
1214 }
1215 if (*arg) { /* Some filename specified? */
1216 if (REISERFS_SB(s)->s_qf_names[qtype]
1217 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1218 arg)) {
1219 reiserfs_warning(s, "super-6512",
1220 "%s quota file "
1221 "already specified.",
1222 QTYPE2NAME(qtype));
1223 return 0;
1224 }
1225 if (strchr(arg, '/')) {
1226 reiserfs_warning(s, "super-6513",
1227 "quotafile must be "
1228 "on filesystem root.");
1229 return 0;
1230 }
1231 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1232 if (!qf_names[qtype]) {
1233 reiserfs_warning(s, "reiserfs-2502",
1234 "not enough memory "
1235 "for storing "
1236 "quotafile name.");
1237 return 0;
1238 }
1239 if (qtype == USRQUOTA)
1240 *mount_options |= 1 << REISERFS_USRQUOTA;
1241 else
1242 *mount_options |= 1 << REISERFS_GRPQUOTA;
1243 } else {
1244 if (qf_names[qtype] !=
1245 REISERFS_SB(s)->s_qf_names[qtype])
1246 kfree(qf_names[qtype]);
1247 qf_names[qtype] = NULL;
1248 if (qtype == USRQUOTA)
1249 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1250 else
1251 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1252 }
1253 }
1254 if (c == 'f') {
1255 if (!strcmp(arg, "vfsold"))
1256 *qfmt = QFMT_VFS_OLD;
1257 else if (!strcmp(arg, "vfsv0"))
1258 *qfmt = QFMT_VFS_V0;
1259 else {
1260 reiserfs_warning(s, "super-6514",
1261 "unknown quota format "
1262 "specified.");
1263 return 0;
1264 }
1265 if (sb_any_quota_loaded(s) &&
1266 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1267 reiserfs_warning(s, "super-6515",
1268 "cannot change journaled "
1269 "quota options when quota "
1270 "turned on.");
1271 return 0;
1272 }
1273 }
1274 #else
1275 if (c == 'u' || c == 'g' || c == 'f') {
1276 reiserfs_warning(s, "reiserfs-2503", "journaled "
1277 "quota options not supported.");
1278 return 0;
1279 }
1280 #endif
1281 }
1282
1283 #ifdef CONFIG_QUOTA
1284 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1285 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1286 reiserfs_warning(s, "super-6515",
1287 "journaled quota format not specified.");
1288 return 0;
1289 }
1290 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1291 sb_has_quota_loaded(s, USRQUOTA)) ||
1292 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1293 sb_has_quota_loaded(s, GRPQUOTA))) {
1294 reiserfs_warning(s, "super-6516", "quota options must "
1295 "be present when quota is turned on.");
1296 return 0;
1297 }
1298 #endif
1299
1300 return 1;
1301 }
1302
1303 static void switch_data_mode(struct super_block *s, unsigned long mode)
1304 {
1305 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1306 (1 << REISERFS_DATA_ORDERED) |
1307 (1 << REISERFS_DATA_WRITEBACK));
1308 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1309 }
1310
1311 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1312 {
1313 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1314 if (!reiserfs_data_log(s)) {
1315 switch_data_mode(s, REISERFS_DATA_LOG);
1316 reiserfs_info(s, "switching to journaled data mode\n");
1317 }
1318 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1319 if (!reiserfs_data_ordered(s)) {
1320 switch_data_mode(s, REISERFS_DATA_ORDERED);
1321 reiserfs_info(s, "switching to ordered data mode\n");
1322 }
1323 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1324 if (!reiserfs_data_writeback(s)) {
1325 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1326 reiserfs_info(s, "switching to writeback data mode\n");
1327 }
1328 }
1329 }
1330
1331 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1332 {
1333 int flush = (1 << REISERFS_BARRIER_FLUSH);
1334 int none = (1 << REISERFS_BARRIER_NONE);
1335 int all_barrier = flush | none;
1336
1337 if (bits & all_barrier) {
1338 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1339 if (bits & flush) {
1340 REISERFS_SB(s)->s_mount_opt |= flush;
1341 printk("reiserfs: enabling write barrier flush mode\n");
1342 } else if (bits & none) {
1343 REISERFS_SB(s)->s_mount_opt |= none;
1344 printk("reiserfs: write barriers turned off\n");
1345 }
1346 }
1347 }
1348
1349 static void handle_attrs(struct super_block *s)
1350 {
1351 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1352
1353 if (reiserfs_attrs(s)) {
1354 if (old_format_only(s)) {
1355 reiserfs_warning(s, "super-6517", "cannot support "
1356 "attributes on 3.5.x disk format");
1357 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1358 return;
1359 }
1360 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1361 reiserfs_warning(s, "super-6518", "cannot support "
1362 "attributes until flag is set in "
1363 "super-block");
1364 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1365 }
1366 }
1367 }
1368
1369 #ifdef CONFIG_QUOTA
1370 static void handle_quota_files(struct super_block *s, char **qf_names,
1371 unsigned int *qfmt)
1372 {
1373 int i;
1374
1375 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1376 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1377 kfree(REISERFS_SB(s)->s_qf_names[i]);
1378 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1379 }
1380 if (*qfmt)
1381 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1382 }
1383 #endif
1384
1385 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1386 {
1387 struct reiserfs_super_block *rs;
1388 struct reiserfs_transaction_handle th;
1389 unsigned long blocks;
1390 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1391 unsigned long safe_mask = 0;
1392 unsigned int commit_max_age = (unsigned int)-1;
1393 struct reiserfs_journal *journal = SB_JOURNAL(s);
1394 char *new_opts = kstrdup(arg, GFP_KERNEL);
1395 int err;
1396 char *qf_names[REISERFS_MAXQUOTAS];
1397 unsigned int qfmt = 0;
1398 #ifdef CONFIG_QUOTA
1399 int i;
1400 #endif
1401
1402 sync_filesystem(s);
1403 reiserfs_write_lock(s);
1404
1405 #ifdef CONFIG_QUOTA
1406 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1407 #endif
1408
1409 rs = SB_DISK_SUPER_BLOCK(s);
1410
1411 if (!reiserfs_parse_options
1412 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1413 qf_names, &qfmt)) {
1414 #ifdef CONFIG_QUOTA
1415 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1416 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1417 kfree(qf_names[i]);
1418 #endif
1419 err = -EINVAL;
1420 goto out_err_unlock;
1421 }
1422 #ifdef CONFIG_QUOTA
1423 handle_quota_files(s, qf_names, &qfmt);
1424 #endif
1425
1426 handle_attrs(s);
1427
1428 /* Add options that are safe here */
1429 safe_mask |= 1 << REISERFS_SMALLTAIL;
1430 safe_mask |= 1 << REISERFS_LARGETAIL;
1431 safe_mask |= 1 << REISERFS_NO_BORDER;
1432 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1433 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1434 safe_mask |= 1 << REISERFS_TEST4;
1435 safe_mask |= 1 << REISERFS_ATTRS;
1436 safe_mask |= 1 << REISERFS_XATTRS_USER;
1437 safe_mask |= 1 << REISERFS_POSIXACL;
1438 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1439 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1440 safe_mask |= 1 << REISERFS_ERROR_RO;
1441 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1442 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1443 safe_mask |= 1 << REISERFS_USRQUOTA;
1444 safe_mask |= 1 << REISERFS_GRPQUOTA;
1445
1446 /*
1447 * Update the bitmask, taking care to keep
1448 * the bits we're not allowed to change here
1449 */
1450 REISERFS_SB(s)->s_mount_opt =
1451 (REISERFS_SB(s)->
1452 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1453
1454 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1455 journal->j_max_commit_age = commit_max_age;
1456 journal->j_max_trans_age = commit_max_age;
1457 } else if (commit_max_age == 0) {
1458 /* 0 means restore defaults. */
1459 journal->j_max_commit_age = journal->j_default_max_commit_age;
1460 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1461 }
1462
1463 if (blocks) {
1464 err = reiserfs_resize(s, blocks);
1465 if (err != 0)
1466 goto out_err_unlock;
1467 }
1468
1469 if (*mount_flags & MS_RDONLY) {
1470 reiserfs_write_unlock(s);
1471 reiserfs_xattr_init(s, *mount_flags);
1472 /* remount read-only */
1473 if (s->s_flags & MS_RDONLY)
1474 /* it is read-only already */
1475 goto out_ok_unlocked;
1476
1477 err = dquot_suspend(s, -1);
1478 if (err < 0)
1479 goto out_err;
1480
1481 /* try to remount file system with read-only permissions */
1482 if (sb_umount_state(rs) == REISERFS_VALID_FS
1483 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1484 goto out_ok_unlocked;
1485 }
1486
1487 reiserfs_write_lock(s);
1488
1489 err = journal_begin(&th, s, 10);
1490 if (err)
1491 goto out_err_unlock;
1492
1493 /* Mounting a rw partition read-only. */
1494 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1495 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1496 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1497 } else {
1498 /* remount read-write */
1499 if (!(s->s_flags & MS_RDONLY)) {
1500 reiserfs_write_unlock(s);
1501 reiserfs_xattr_init(s, *mount_flags);
1502 goto out_ok_unlocked; /* We are read-write already */
1503 }
1504
1505 if (reiserfs_is_journal_aborted(journal)) {
1506 err = journal->j_errno;
1507 goto out_err_unlock;
1508 }
1509
1510 handle_data_mode(s, mount_options);
1511 handle_barrier_mode(s, mount_options);
1512 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1513
1514 /* now it is safe to call journal_begin */
1515 s->s_flags &= ~MS_RDONLY;
1516 err = journal_begin(&th, s, 10);
1517 if (err)
1518 goto out_err_unlock;
1519
1520 /* Mount a partition which is read-only, read-write */
1521 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1522 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1523 s->s_flags &= ~MS_RDONLY;
1524 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1525 if (!old_format_only(s))
1526 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1527 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1528 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1529 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1530 }
1531 /* this will force a full flush of all journal lists */
1532 SB_JOURNAL(s)->j_must_wait = 1;
1533 err = journal_end(&th);
1534 if (err)
1535 goto out_err_unlock;
1536
1537 reiserfs_write_unlock(s);
1538 if (!(*mount_flags & MS_RDONLY)) {
1539 dquot_resume(s, -1);
1540 reiserfs_write_lock(s);
1541 finish_unfinished(s);
1542 reiserfs_write_unlock(s);
1543 reiserfs_xattr_init(s, *mount_flags);
1544 }
1545
1546 out_ok_unlocked:
1547 replace_mount_options(s, new_opts);
1548 return 0;
1549
1550 out_err_unlock:
1551 reiserfs_write_unlock(s);
1552 out_err:
1553 kfree(new_opts);
1554 return err;
1555 }
1556
1557 static int read_super_block(struct super_block *s, int offset)
1558 {
1559 struct buffer_head *bh;
1560 struct reiserfs_super_block *rs;
1561 int fs_blocksize;
1562
1563 bh = sb_bread(s, offset / s->s_blocksize);
1564 if (!bh) {
1565 reiserfs_warning(s, "sh-2006",
1566 "bread failed (dev %s, block %lu, size %lu)",
1567 s->s_id, offset / s->s_blocksize,
1568 s->s_blocksize);
1569 return 1;
1570 }
1571
1572 rs = (struct reiserfs_super_block *)bh->b_data;
1573 if (!is_any_reiserfs_magic_string(rs)) {
1574 brelse(bh);
1575 return 1;
1576 }
1577 /*
1578 * ok, reiserfs signature (old or new) found in at the given offset
1579 */
1580 fs_blocksize = sb_blocksize(rs);
1581 brelse(bh);
1582 sb_set_blocksize(s, fs_blocksize);
1583
1584 bh = sb_bread(s, offset / s->s_blocksize);
1585 if (!bh) {
1586 reiserfs_warning(s, "sh-2007",
1587 "bread failed (dev %s, block %lu, size %lu)",
1588 s->s_id, offset / s->s_blocksize,
1589 s->s_blocksize);
1590 return 1;
1591 }
1592
1593 rs = (struct reiserfs_super_block *)bh->b_data;
1594 if (sb_blocksize(rs) != s->s_blocksize) {
1595 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1596 "filesystem on (dev %s, block %llu, size %lu)",
1597 s->s_id,
1598 (unsigned long long)bh->b_blocknr,
1599 s->s_blocksize);
1600 brelse(bh);
1601 return 1;
1602 }
1603
1604 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1605 brelse(bh);
1606 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1607 "--rebuild-tree run detected. Please run\n"
1608 "reiserfsck --rebuild-tree and wait for a "
1609 "completion. If that fails\n"
1610 "get newer reiserfsprogs package");
1611 return 1;
1612 }
1613
1614 SB_BUFFER_WITH_SB(s) = bh;
1615 SB_DISK_SUPER_BLOCK(s) = rs;
1616
1617 /*
1618 * magic is of non-standard journal filesystem, look at s_version to
1619 * find which format is in use
1620 */
1621 if (is_reiserfs_jr(rs)) {
1622 if (sb_version(rs) == REISERFS_VERSION_2)
1623 reiserfs_info(s, "found reiserfs format \"3.6\""
1624 " with non-standard journal\n");
1625 else if (sb_version(rs) == REISERFS_VERSION_1)
1626 reiserfs_info(s, "found reiserfs format \"3.5\""
1627 " with non-standard journal\n");
1628 else {
1629 reiserfs_warning(s, "sh-2012", "found unknown "
1630 "format \"%u\" of reiserfs with "
1631 "non-standard magic", sb_version(rs));
1632 return 1;
1633 }
1634 } else
1635 /*
1636 * s_version of standard format may contain incorrect
1637 * information, so we just look at the magic string
1638 */
1639 reiserfs_info(s,
1640 "found reiserfs format \"%s\" with standard journal\n",
1641 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1642
1643 s->s_op = &reiserfs_sops;
1644 s->s_export_op = &reiserfs_export_ops;
1645 #ifdef CONFIG_QUOTA
1646 s->s_qcop = &reiserfs_qctl_operations;
1647 s->dq_op = &reiserfs_quota_operations;
1648 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1649 #endif
1650
1651 /*
1652 * new format is limited by the 32 bit wide i_blocks field, want to
1653 * be one full block below that.
1654 */
1655 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1656 return 0;
1657 }
1658
1659 /* after journal replay, reread all bitmap and super blocks */
1660 static int reread_meta_blocks(struct super_block *s)
1661 {
1662 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1663 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1664 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1665 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1666 return 1;
1667 }
1668
1669 return 0;
1670 }
1671
1672 /* hash detection stuff */
1673
1674 /*
1675 * if root directory is empty - we set default - Yura's - hash and
1676 * warn about it
1677 * FIXME: we look for only one name in a directory. If tea and yura
1678 * both have the same value - we ask user to send report to the
1679 * mailing list
1680 */
1681 static __u32 find_hash_out(struct super_block *s)
1682 {
1683 int retval;
1684 struct inode *inode;
1685 struct cpu_key key;
1686 INITIALIZE_PATH(path);
1687 struct reiserfs_dir_entry de;
1688 struct reiserfs_de_head *deh;
1689 __u32 hash = DEFAULT_HASH;
1690 __u32 deh_hashval, teahash, r5hash, yurahash;
1691
1692 inode = d_inode(s->s_root);
1693
1694 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1695 retval = search_by_entry_key(s, &key, &path, &de);
1696 if (retval == IO_ERROR) {
1697 pathrelse(&path);
1698 return UNSET_HASH;
1699 }
1700 if (retval == NAME_NOT_FOUND)
1701 de.de_entry_num--;
1702
1703 set_de_name_and_namelen(&de);
1704 deh = de.de_deh + de.de_entry_num;
1705
1706 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1707 /* allow override in this case */
1708 if (reiserfs_rupasov_hash(s))
1709 hash = YURA_HASH;
1710 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1711 goto out;
1712 }
1713
1714 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1715 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1716 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1717 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1718
1719 if ((teahash == r5hash && deh_hashval == r5hash) ||
1720 (teahash == yurahash && deh_hashval == yurahash) ||
1721 (r5hash == yurahash && deh_hashval == yurahash)) {
1722 reiserfs_warning(s, "reiserfs-2506",
1723 "Unable to automatically detect hash "
1724 "function. Please mount with -o "
1725 "hash={tea,rupasov,r5}");
1726 hash = UNSET_HASH;
1727 goto out;
1728 }
1729
1730 if (deh_hashval == yurahash)
1731 hash = YURA_HASH;
1732 else if (deh_hashval == teahash)
1733 hash = TEA_HASH;
1734 else if (deh_hashval == r5hash)
1735 hash = R5_HASH;
1736 else {
1737 reiserfs_warning(s, "reiserfs-2506",
1738 "Unrecognised hash function");
1739 hash = UNSET_HASH;
1740 }
1741 out:
1742 pathrelse(&path);
1743 return hash;
1744 }
1745
1746 /* finds out which hash names are sorted with */
1747 static int what_hash(struct super_block *s)
1748 {
1749 __u32 code;
1750
1751 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1752
1753 /*
1754 * reiserfs_hash_detect() == true if any of the hash mount options
1755 * were used. We must check them to make sure the user isn't
1756 * using a bad hash value
1757 */
1758 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1759 code = find_hash_out(s);
1760
1761 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1762 /*
1763 * detection has found the hash, and we must check against the
1764 * mount options
1765 */
1766 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1767 reiserfs_warning(s, "reiserfs-2507",
1768 "Error, %s hash detected, "
1769 "unable to force rupasov hash",
1770 reiserfs_hashname(code));
1771 code = UNSET_HASH;
1772 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1773 reiserfs_warning(s, "reiserfs-2508",
1774 "Error, %s hash detected, "
1775 "unable to force tea hash",
1776 reiserfs_hashname(code));
1777 code = UNSET_HASH;
1778 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1779 reiserfs_warning(s, "reiserfs-2509",
1780 "Error, %s hash detected, "
1781 "unable to force r5 hash",
1782 reiserfs_hashname(code));
1783 code = UNSET_HASH;
1784 }
1785 } else {
1786 /*
1787 * find_hash_out was not called or
1788 * could not determine the hash
1789 */
1790 if (reiserfs_rupasov_hash(s)) {
1791 code = YURA_HASH;
1792 } else if (reiserfs_tea_hash(s)) {
1793 code = TEA_HASH;
1794 } else if (reiserfs_r5_hash(s)) {
1795 code = R5_HASH;
1796 }
1797 }
1798
1799 /*
1800 * if we are mounted RW, and we have a new valid hash code, update
1801 * the super
1802 */
1803 if (code != UNSET_HASH &&
1804 !(s->s_flags & MS_RDONLY) &&
1805 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1806 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1807 }
1808 return code;
1809 }
1810
1811 /* return pointer to appropriate function */
1812 static hashf_t hash_function(struct super_block *s)
1813 {
1814 switch (what_hash(s)) {
1815 case TEA_HASH:
1816 reiserfs_info(s, "Using tea hash to sort names\n");
1817 return keyed_hash;
1818 case YURA_HASH:
1819 reiserfs_info(s, "Using rupasov hash to sort names\n");
1820 return yura_hash;
1821 case R5_HASH:
1822 reiserfs_info(s, "Using r5 hash to sort names\n");
1823 return r5_hash;
1824 }
1825 return NULL;
1826 }
1827
1828 /* this is used to set up correct value for old partitions */
1829 static int function2code(hashf_t func)
1830 {
1831 if (func == keyed_hash)
1832 return TEA_HASH;
1833 if (func == yura_hash)
1834 return YURA_HASH;
1835 if (func == r5_hash)
1836 return R5_HASH;
1837
1838 BUG(); /* should never happen */
1839
1840 return 0;
1841 }
1842
1843 #define SWARN(silent, s, id, ...) \
1844 if (!(silent)) \
1845 reiserfs_warning(s, id, __VA_ARGS__)
1846
1847 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1848 {
1849 struct inode *root_inode;
1850 struct reiserfs_transaction_handle th;
1851 int old_format = 0;
1852 unsigned long blocks;
1853 unsigned int commit_max_age = 0;
1854 int jinit_done = 0;
1855 struct reiserfs_iget_args args;
1856 struct reiserfs_super_block *rs;
1857 char *jdev_name;
1858 struct reiserfs_sb_info *sbi;
1859 int errval = -EINVAL;
1860 char *qf_names[REISERFS_MAXQUOTAS] = {};
1861 unsigned int qfmt = 0;
1862
1863 save_mount_options(s, data);
1864
1865 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1866 if (!sbi)
1867 return -ENOMEM;
1868 s->s_fs_info = sbi;
1869 /* Set default values for options: non-aggressive tails, RO on errors */
1870 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1871 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1872 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1873 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1874 sbi->s_alloc_options.preallocmin = 0;
1875 /* Preallocate by 16 blocks (17-1) at once */
1876 sbi->s_alloc_options.preallocsize = 17;
1877 /* setup default block allocator options */
1878 reiserfs_init_alloc_options(s);
1879
1880 spin_lock_init(&sbi->old_work_lock);
1881 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1882 mutex_init(&sbi->lock);
1883 sbi->lock_depth = -1;
1884
1885 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1886 s->s_id);
1887 if (!sbi->commit_wq) {
1888 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1889 errval = -ENOMEM;
1890 goto error_unlocked;
1891 }
1892
1893 jdev_name = NULL;
1894 if (reiserfs_parse_options
1895 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1896 &commit_max_age, qf_names, &qfmt) == 0) {
1897 goto error_unlocked;
1898 }
1899 if (jdev_name && jdev_name[0]) {
1900 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1901 if (!sbi->s_jdev) {
1902 SWARN(silent, s, "", "Cannot allocate memory for "
1903 "journal device name");
1904 goto error;
1905 }
1906 }
1907 #ifdef CONFIG_QUOTA
1908 handle_quota_files(s, qf_names, &qfmt);
1909 #endif
1910
1911 if (blocks) {
1912 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1913 goto error_unlocked;
1914 }
1915
1916 /*
1917 * try old format (undistributed bitmap, super block in 8-th 1k
1918 * block of a device)
1919 */
1920 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1921 old_format = 1;
1922
1923 /*
1924 * try new format (64-th 1k block), which can contain reiserfs
1925 * super block
1926 */
1927 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1928 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1929 s->s_id);
1930 goto error_unlocked;
1931 }
1932
1933 rs = SB_DISK_SUPER_BLOCK(s);
1934 /*
1935 * Let's do basic sanity check to verify that underlying device is not
1936 * smaller than the filesystem. If the check fails then abort and
1937 * scream, because bad stuff will happen otherwise.
1938 */
1939 if (s->s_bdev && s->s_bdev->bd_inode
1940 && i_size_read(s->s_bdev->bd_inode) <
1941 sb_block_count(rs) * sb_blocksize(rs)) {
1942 SWARN(silent, s, "", "Filesystem cannot be "
1943 "mounted because it is bigger than the device");
1944 SWARN(silent, s, "", "You may need to run fsck "
1945 "or increase size of your LVM partition");
1946 SWARN(silent, s, "", "Or may be you forgot to "
1947 "reboot after fdisk when it told you to");
1948 goto error_unlocked;
1949 }
1950
1951 sbi->s_mount_state = SB_REISERFS_STATE(s);
1952 sbi->s_mount_state = REISERFS_VALID_FS;
1953
1954 if ((errval = reiserfs_init_bitmap_cache(s))) {
1955 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1956 goto error_unlocked;
1957 }
1958
1959 errval = -EINVAL;
1960 #ifdef CONFIG_REISERFS_CHECK
1961 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1962 SWARN(silent, s, "", "- it is slow mode for debugging.");
1963 #endif
1964
1965 /* make data=ordered the default */
1966 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1967 !reiserfs_data_writeback(s)) {
1968 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1969 }
1970
1971 if (reiserfs_data_log(s)) {
1972 reiserfs_info(s, "using journaled data mode\n");
1973 } else if (reiserfs_data_ordered(s)) {
1974 reiserfs_info(s, "using ordered data mode\n");
1975 } else {
1976 reiserfs_info(s, "using writeback data mode\n");
1977 }
1978 if (reiserfs_barrier_flush(s)) {
1979 printk("reiserfs: using flush barriers\n");
1980 }
1981
1982 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1983 SWARN(silent, s, "sh-2022",
1984 "unable to initialize journal space");
1985 goto error_unlocked;
1986 } else {
1987 /*
1988 * once this is set, journal_release must be called
1989 * if we error out of the mount
1990 */
1991 jinit_done = 1;
1992 }
1993
1994 if (reread_meta_blocks(s)) {
1995 SWARN(silent, s, "jmacd-9",
1996 "unable to reread meta blocks after journal init");
1997 goto error_unlocked;
1998 }
1999
2000 if (replay_only(s))
2001 goto error_unlocked;
2002
2003 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2004 SWARN(silent, s, "clm-7000",
2005 "Detected readonly device, marking FS readonly");
2006 s->s_flags |= MS_RDONLY;
2007 }
2008 args.objectid = REISERFS_ROOT_OBJECTID;
2009 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2010 root_inode =
2011 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2012 reiserfs_init_locked_inode, (void *)&args);
2013 if (!root_inode) {
2014 SWARN(silent, s, "jmacd-10", "get root inode failed");
2015 goto error_unlocked;
2016 }
2017
2018 /*
2019 * This path assumed to be called with the BKL in the old times.
2020 * Now we have inherited the big reiserfs lock from it and many
2021 * reiserfs helpers called in the mount path and elsewhere require
2022 * this lock to be held even if it's not always necessary. Let's be
2023 * conservative and hold it early. The window can be reduced after
2024 * careful review of the code.
2025 */
2026 reiserfs_write_lock(s);
2027
2028 if (root_inode->i_state & I_NEW) {
2029 reiserfs_read_locked_inode(root_inode, &args);
2030 unlock_new_inode(root_inode);
2031 }
2032
2033 s->s_root = d_make_root(root_inode);
2034 if (!s->s_root)
2035 goto error;
2036 /* define and initialize hash function */
2037 sbi->s_hash_function = hash_function(s);
2038 if (sbi->s_hash_function == NULL) {
2039 dput(s->s_root);
2040 s->s_root = NULL;
2041 goto error;
2042 }
2043
2044 if (is_reiserfs_3_5(rs)
2045 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2046 set_bit(REISERFS_3_5, &sbi->s_properties);
2047 else if (old_format)
2048 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2049 else
2050 set_bit(REISERFS_3_6, &sbi->s_properties);
2051
2052 if (!(s->s_flags & MS_RDONLY)) {
2053
2054 errval = journal_begin(&th, s, 1);
2055 if (errval) {
2056 dput(s->s_root);
2057 s->s_root = NULL;
2058 goto error;
2059 }
2060 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2061
2062 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2063 set_sb_fs_state(rs, 0);
2064
2065 /*
2066 * Clear out s_bmap_nr if it would wrap. We can handle this
2067 * case, but older revisions can't. This will cause the
2068 * file system to fail mount on those older implementations,
2069 * avoiding corruption. -jeffm
2070 */
2071 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2072 sb_bmap_nr(rs) != 0) {
2073 reiserfs_warning(s, "super-2030", "This file system "
2074 "claims to use %u bitmap blocks in "
2075 "its super block, but requires %u. "
2076 "Clearing to zero.", sb_bmap_nr(rs),
2077 reiserfs_bmap_count(s));
2078
2079 set_sb_bmap_nr(rs, 0);
2080 }
2081
2082 if (old_format_only(s)) {
2083 /*
2084 * filesystem of format 3.5 either with standard
2085 * or non-standard journal
2086 */
2087 if (convert_reiserfs(s)) {
2088 /* and -o conv is given */
2089 if (!silent)
2090 reiserfs_info(s,
2091 "converting 3.5 filesystem to the 3.6 format");
2092
2093 if (is_reiserfs_3_5(rs))
2094 /*
2095 * put magic string of 3.6 format.
2096 * 2.2 will not be able to
2097 * mount this filesystem anymore
2098 */
2099 memcpy(rs->s_v1.s_magic,
2100 reiserfs_3_6_magic_string,
2101 sizeof
2102 (reiserfs_3_6_magic_string));
2103
2104 set_sb_version(rs, REISERFS_VERSION_2);
2105 reiserfs_convert_objectid_map_v1(s);
2106 set_bit(REISERFS_3_6, &sbi->s_properties);
2107 clear_bit(REISERFS_3_5, &sbi->s_properties);
2108 } else if (!silent) {
2109 reiserfs_info(s, "using 3.5.x disk format\n");
2110 }
2111 } else
2112 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2113
2114
2115 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2116 errval = journal_end(&th);
2117 if (errval) {
2118 dput(s->s_root);
2119 s->s_root = NULL;
2120 goto error;
2121 }
2122
2123 reiserfs_write_unlock(s);
2124 if ((errval = reiserfs_lookup_privroot(s)) ||
2125 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2126 dput(s->s_root);
2127 s->s_root = NULL;
2128 goto error_unlocked;
2129 }
2130 reiserfs_write_lock(s);
2131
2132 /*
2133 * look for files which were to be removed in previous session
2134 */
2135 finish_unfinished(s);
2136 } else {
2137 if (old_format_only(s) && !silent) {
2138 reiserfs_info(s, "using 3.5.x disk format\n");
2139 }
2140
2141 reiserfs_write_unlock(s);
2142 if ((errval = reiserfs_lookup_privroot(s)) ||
2143 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2144 dput(s->s_root);
2145 s->s_root = NULL;
2146 goto error_unlocked;
2147 }
2148 reiserfs_write_lock(s);
2149 }
2150 /*
2151 * mark hash in super block: it could be unset. overwrite should be ok
2152 */
2153 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2154
2155 handle_attrs(s);
2156
2157 reiserfs_proc_info_init(s);
2158
2159 init_waitqueue_head(&(sbi->s_wait));
2160 spin_lock_init(&sbi->bitmap_lock);
2161
2162 reiserfs_write_unlock(s);
2163
2164 return (0);
2165
2166 error:
2167 reiserfs_write_unlock(s);
2168
2169 error_unlocked:
2170 /* kill the commit thread, free journal ram */
2171 if (jinit_done) {
2172 reiserfs_write_lock(s);
2173 journal_release_error(NULL, s);
2174 reiserfs_write_unlock(s);
2175 }
2176
2177 if (sbi->commit_wq)
2178 destroy_workqueue(sbi->commit_wq);
2179
2180 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2181
2182 reiserfs_free_bitmap_cache(s);
2183 if (SB_BUFFER_WITH_SB(s))
2184 brelse(SB_BUFFER_WITH_SB(s));
2185 #ifdef CONFIG_QUOTA
2186 {
2187 int j;
2188 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2189 kfree(qf_names[j]);
2190 }
2191 #endif
2192 kfree(sbi);
2193
2194 s->s_fs_info = NULL;
2195 return errval;
2196 }
2197
2198 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2199 {
2200 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2201
2202 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2203 buf->f_bfree = sb_free_blocks(rs);
2204 buf->f_bavail = buf->f_bfree;
2205 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2206 buf->f_bsize = dentry->d_sb->s_blocksize;
2207 /* changed to accommodate gcc folks. */
2208 buf->f_type = REISERFS_SUPER_MAGIC;
2209 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2210 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2211 sizeof(rs->s_uuid)/2);
2212
2213 return 0;
2214 }
2215
2216 #ifdef CONFIG_QUOTA
2217 static int reiserfs_write_dquot(struct dquot *dquot)
2218 {
2219 struct reiserfs_transaction_handle th;
2220 int ret, err;
2221 int depth;
2222
2223 reiserfs_write_lock(dquot->dq_sb);
2224 ret =
2225 journal_begin(&th, dquot->dq_sb,
2226 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2227 if (ret)
2228 goto out;
2229 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2230 ret = dquot_commit(dquot);
2231 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2232 err = journal_end(&th);
2233 if (!ret && err)
2234 ret = err;
2235 out:
2236 reiserfs_write_unlock(dquot->dq_sb);
2237 return ret;
2238 }
2239
2240 static int reiserfs_acquire_dquot(struct dquot *dquot)
2241 {
2242 struct reiserfs_transaction_handle th;
2243 int ret, err;
2244 int depth;
2245
2246 reiserfs_write_lock(dquot->dq_sb);
2247 ret =
2248 journal_begin(&th, dquot->dq_sb,
2249 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2250 if (ret)
2251 goto out;
2252 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2253 ret = dquot_acquire(dquot);
2254 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2255 err = journal_end(&th);
2256 if (!ret && err)
2257 ret = err;
2258 out:
2259 reiserfs_write_unlock(dquot->dq_sb);
2260 return ret;
2261 }
2262
2263 static int reiserfs_release_dquot(struct dquot *dquot)
2264 {
2265 struct reiserfs_transaction_handle th;
2266 int ret, err;
2267
2268 reiserfs_write_lock(dquot->dq_sb);
2269 ret =
2270 journal_begin(&th, dquot->dq_sb,
2271 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2272 reiserfs_write_unlock(dquot->dq_sb);
2273 if (ret) {
2274 /* Release dquot anyway to avoid endless cycle in dqput() */
2275 dquot_release(dquot);
2276 goto out;
2277 }
2278 ret = dquot_release(dquot);
2279 reiserfs_write_lock(dquot->dq_sb);
2280 err = journal_end(&th);
2281 if (!ret && err)
2282 ret = err;
2283 reiserfs_write_unlock(dquot->dq_sb);
2284 out:
2285 return ret;
2286 }
2287
2288 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2289 {
2290 /* Are we journaling quotas? */
2291 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2292 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2293 dquot_mark_dquot_dirty(dquot);
2294 return reiserfs_write_dquot(dquot);
2295 } else
2296 return dquot_mark_dquot_dirty(dquot);
2297 }
2298
2299 static int reiserfs_write_info(struct super_block *sb, int type)
2300 {
2301 struct reiserfs_transaction_handle th;
2302 int ret, err;
2303 int depth;
2304
2305 /* Data block + inode block */
2306 reiserfs_write_lock(sb);
2307 ret = journal_begin(&th, sb, 2);
2308 if (ret)
2309 goto out;
2310 depth = reiserfs_write_unlock_nested(sb);
2311 ret = dquot_commit_info(sb, type);
2312 reiserfs_write_lock_nested(sb, depth);
2313 err = journal_end(&th);
2314 if (!ret && err)
2315 ret = err;
2316 out:
2317 reiserfs_write_unlock(sb);
2318 return ret;
2319 }
2320
2321 /*
2322 * Turn on quotas during mount time - we need to find the quota file and such...
2323 */
2324 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2325 {
2326 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2327 REISERFS_SB(sb)->s_jquota_fmt, type);
2328 }
2329
2330 /*
2331 * Standard function to be called on quota_on
2332 */
2333 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2334 struct path *path)
2335 {
2336 int err;
2337 struct inode *inode;
2338 struct reiserfs_transaction_handle th;
2339 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2340
2341 reiserfs_write_lock(sb);
2342 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2343 err = -EINVAL;
2344 goto out;
2345 }
2346
2347 /* Quotafile not on the same filesystem? */
2348 if (path->dentry->d_sb != sb) {
2349 err = -EXDEV;
2350 goto out;
2351 }
2352 inode = d_inode(path->dentry);
2353 /*
2354 * We must not pack tails for quota files on reiserfs for quota
2355 * IO to work
2356 */
2357 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2358 err = reiserfs_unpack(inode, NULL);
2359 if (err) {
2360 reiserfs_warning(sb, "super-6520",
2361 "Unpacking tail of quota file failed"
2362 " (%d). Cannot turn on quotas.", err);
2363 err = -EINVAL;
2364 goto out;
2365 }
2366 mark_inode_dirty(inode);
2367 }
2368 /* Journaling quota? */
2369 if (REISERFS_SB(sb)->s_qf_names[type]) {
2370 /* Quotafile not of fs root? */
2371 if (path->dentry->d_parent != sb->s_root)
2372 reiserfs_warning(sb, "super-6521",
2373 "Quota file not on filesystem root. "
2374 "Journalled quota will not work.");
2375 }
2376
2377 /*
2378 * When we journal data on quota file, we have to flush journal to see
2379 * all updates to the file when we bypass pagecache...
2380 */
2381 if (reiserfs_file_data_log(inode)) {
2382 /* Just start temporary transaction and finish it */
2383 err = journal_begin(&th, sb, 1);
2384 if (err)
2385 goto out;
2386 err = journal_end_sync(&th);
2387 if (err)
2388 goto out;
2389 }
2390 reiserfs_write_unlock(sb);
2391 return dquot_quota_on(sb, type, format_id, path);
2392 out:
2393 reiserfs_write_unlock(sb);
2394 return err;
2395 }
2396
2397 /*
2398 * Read data from quotafile - avoid pagecache and such because we cannot afford
2399 * acquiring the locks... As quota files are never truncated and quota code
2400 * itself serializes the operations (and no one else should touch the files)
2401 * we don't have to be afraid of races
2402 */
2403 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2404 size_t len, loff_t off)
2405 {
2406 struct inode *inode = sb_dqopt(sb)->files[type];
2407 unsigned long blk = off >> sb->s_blocksize_bits;
2408 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2409 size_t toread;
2410 struct buffer_head tmp_bh, *bh;
2411 loff_t i_size = i_size_read(inode);
2412
2413 if (off > i_size)
2414 return 0;
2415 if (off + len > i_size)
2416 len = i_size - off;
2417 toread = len;
2418 while (toread > 0) {
2419 tocopy =
2420 sb->s_blocksize - offset <
2421 toread ? sb->s_blocksize - offset : toread;
2422 tmp_bh.b_state = 0;
2423 /*
2424 * Quota files are without tails so we can safely
2425 * use this function
2426 */
2427 reiserfs_write_lock(sb);
2428 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2429 reiserfs_write_unlock(sb);
2430 if (err)
2431 return err;
2432 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2433 memset(data, 0, tocopy);
2434 else {
2435 bh = sb_bread(sb, tmp_bh.b_blocknr);
2436 if (!bh)
2437 return -EIO;
2438 memcpy(data, bh->b_data + offset, tocopy);
2439 brelse(bh);
2440 }
2441 offset = 0;
2442 toread -= tocopy;
2443 data += tocopy;
2444 blk++;
2445 }
2446 return len;
2447 }
2448
2449 /*
2450 * Write to quotafile (we know the transaction is already started and has
2451 * enough credits)
2452 */
2453 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2454 const char *data, size_t len, loff_t off)
2455 {
2456 struct inode *inode = sb_dqopt(sb)->files[type];
2457 unsigned long blk = off >> sb->s_blocksize_bits;
2458 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2459 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2460 size_t towrite = len;
2461 struct buffer_head tmp_bh, *bh;
2462
2463 if (!current->journal_info) {
2464 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2465 (unsigned long long)off, (unsigned long long)len);
2466 return -EIO;
2467 }
2468 while (towrite > 0) {
2469 tocopy = sb->s_blocksize - offset < towrite ?
2470 sb->s_blocksize - offset : towrite;
2471 tmp_bh.b_state = 0;
2472 reiserfs_write_lock(sb);
2473 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2474 reiserfs_write_unlock(sb);
2475 if (err)
2476 goto out;
2477 if (offset || tocopy != sb->s_blocksize)
2478 bh = sb_bread(sb, tmp_bh.b_blocknr);
2479 else
2480 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2481 if (!bh) {
2482 err = -EIO;
2483 goto out;
2484 }
2485 lock_buffer(bh);
2486 memcpy(bh->b_data + offset, data, tocopy);
2487 flush_dcache_page(bh->b_page);
2488 set_buffer_uptodate(bh);
2489 unlock_buffer(bh);
2490 reiserfs_write_lock(sb);
2491 reiserfs_prepare_for_journal(sb, bh, 1);
2492 journal_mark_dirty(current->journal_info, bh);
2493 if (!journal_quota)
2494 reiserfs_add_ordered_list(inode, bh);
2495 reiserfs_write_unlock(sb);
2496 brelse(bh);
2497 offset = 0;
2498 towrite -= tocopy;
2499 data += tocopy;
2500 blk++;
2501 }
2502 out:
2503 if (len == towrite)
2504 return err;
2505 if (inode->i_size < off + len - towrite)
2506 i_size_write(inode, off + len - towrite);
2507 inode->i_version++;
2508 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2509 mark_inode_dirty(inode);
2510 return len - towrite;
2511 }
2512
2513 #endif
2514
2515 static struct dentry *get_super_block(struct file_system_type *fs_type,
2516 int flags, const char *dev_name,
2517 void *data)
2518 {
2519 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2520 }
2521
2522 static int __init init_reiserfs_fs(void)
2523 {
2524 int ret;
2525
2526 ret = init_inodecache();
2527 if (ret)
2528 return ret;
2529
2530 reiserfs_proc_info_global_init();
2531
2532 ret = register_filesystem(&reiserfs_fs_type);
2533 if (ret)
2534 goto out;
2535
2536 return 0;
2537 out:
2538 reiserfs_proc_info_global_done();
2539 destroy_inodecache();
2540
2541 return ret;
2542 }
2543
2544 static void __exit exit_reiserfs_fs(void)
2545 {
2546 reiserfs_proc_info_global_done();
2547 unregister_filesystem(&reiserfs_fs_type);
2548 destroy_inodecache();
2549 }
2550
2551 struct file_system_type reiserfs_fs_type = {
2552 .owner = THIS_MODULE,
2553 .name = "reiserfs",
2554 .mount = get_super_block,
2555 .kill_sb = reiserfs_kill_sb,
2556 .fs_flags = FS_REQUIRES_DEV,
2557 };
2558 MODULE_ALIAS_FS("reiserfs");
2559
2560 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2561 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2562 MODULE_LICENSE("GPL");
2563
2564 module_init(init_reiserfs_fs);
2565 module_exit(exit_reiserfs_fs);
Linux with added FPC-III support