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NFSv4: Fix buffer overflow checking in __nfs4_get_acl_uncached
[mirror_ubuntu-zesty-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 retval = search_item(s, &max_cpu_key, &path);
247 if (retval != ITEM_NOT_FOUND) {
248 reiserfs_error(s, "vs-2140",
249 "search_by_key returned %d", retval);
250 break;
251 }
252
253 bh = get_last_bh(&path);
254 item_pos = get_item_pos(&path);
255 if (item_pos != B_NR_ITEMS(bh)) {
256 reiserfs_warning(s, "vs-2060",
257 "wrong position found");
258 break;
259 }
260 item_pos--;
261 ih = B_N_PITEM_HEAD(bh, item_pos);
262
263 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
264 /* there are no "save" links anymore */
265 break;
266
267 save_link_key = ih->ih_key;
268 if (is_indirect_le_ih(ih))
269 truncate = 1;
270 else
271 truncate = 0;
272
273 /* reiserfs_iget needs k_dirid and k_objectid only */
274 item = B_I_PITEM(bh, ih);
275 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
276 obj_key.on_disk_key.k_objectid =
277 le32_to_cpu(ih->ih_key.k_objectid);
278 obj_key.on_disk_key.k_offset = 0;
279 obj_key.on_disk_key.k_type = 0;
280
281 pathrelse(&path);
282
283 inode = reiserfs_iget(s, &obj_key);
284 if (!inode) {
285 /* the unlink almost completed, it just did not manage to remove
286 "save" link and release objectid */
287 reiserfs_warning(s, "vs-2180", "iget failed for %K",
288 &obj_key);
289 retval = remove_save_link_only(s, &save_link_key, 1);
290 continue;
291 }
292
293 if (!truncate && inode->i_nlink) {
294 /* file is not unlinked */
295 reiserfs_warning(s, "vs-2185",
296 "file %K is not unlinked",
297 &obj_key);
298 retval = remove_save_link_only(s, &save_link_key, 0);
299 continue;
300 }
301 dquot_initialize(inode);
302
303 if (truncate && S_ISDIR(inode->i_mode)) {
304 /* We got a truncate request for a dir which is impossible.
305 The only imaginable way is to execute unfinished truncate request
306 then boot into old kernel, remove the file and create dir with
307 the same key. */
308 reiserfs_warning(s, "green-2101",
309 "impossible truncate on a "
310 "directory %k. Please report",
311 INODE_PKEY(inode));
312 retval = remove_save_link_only(s, &save_link_key, 0);
313 truncate = 0;
314 iput(inode);
315 continue;
316 }
317
318 if (truncate) {
319 REISERFS_I(inode)->i_flags |=
320 i_link_saved_truncate_mask;
321 /* not completed truncate found. New size was committed together
322 with "save" link */
323 reiserfs_info(s, "Truncating %k to %Ld ..",
324 INODE_PKEY(inode), inode->i_size);
325 reiserfs_truncate_file(inode,
326 0
327 /*don't update modification time */
328 );
329 retval = remove_save_link(inode, truncate);
330 } else {
331 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
332 /* not completed unlink (rmdir) found */
333 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
334 if (memcmp(&last_inode_key, INODE_PKEY(inode),
335 sizeof(last_inode_key))){
336 last_inode_key = *INODE_PKEY(inode);
337 /* removal gets completed in iput */
338 retval = 0;
339 } else {
340 reiserfs_warning(s, "super-2189", "Dead loop "
341 "in finish_unfinished "
342 "detected, just remove "
343 "save link\n");
344 retval = remove_save_link_only(s,
345 &save_link_key, 0);
346 }
347 }
348
349 iput(inode);
350 printk("done\n");
351 done++;
352 }
353 REISERFS_SB(s)->s_is_unlinked_ok = 0;
354
355 #ifdef CONFIG_QUOTA
356 /* Turn quotas off */
357 for (i = 0; i < MAXQUOTAS; i++) {
358 if (sb_dqopt(s)->files[i] && quota_enabled[i])
359 dquot_quota_off(s, i);
360 }
361 if (ms_active_set)
362 /* Restore the flag back */
363 s->s_flags &= ~MS_ACTIVE;
364 #endif
365 pathrelse(&path);
366 if (done)
367 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
368 "Completed\n", done);
369 return retval;
370 }
371
372 /* to protect file being unlinked from getting lost we "safe" link files
373 being unlinked. This link will be deleted in the same transaction with last
374 item of file. mounting the filesystem we scan all these links and remove
375 files which almost got lost */
376 void add_save_link(struct reiserfs_transaction_handle *th,
377 struct inode *inode, int truncate)
378 {
379 INITIALIZE_PATH(path);
380 int retval;
381 struct cpu_key key;
382 struct item_head ih;
383 __le32 link;
384
385 BUG_ON(!th->t_trans_id);
386
387 /* file can only get one "save link" of each kind */
388 RFALSE(truncate &&
389 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
390 "saved link already exists for truncated inode %lx",
391 (long)inode->i_ino);
392 RFALSE(!truncate &&
393 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
394 "saved link already exists for unlinked inode %lx",
395 (long)inode->i_ino);
396
397 /* setup key of "save" link */
398 key.version = KEY_FORMAT_3_5;
399 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
400 key.on_disk_key.k_objectid = inode->i_ino;
401 if (!truncate) {
402 /* unlink, rmdir, rename */
403 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
404 set_cpu_key_k_type(&key, TYPE_DIRECT);
405
406 /* item head of "safe" link */
407 make_le_item_head(&ih, &key, key.version,
408 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
409 4 /*length */ , 0xffff /*free space */ );
410 } else {
411 /* truncate */
412 if (S_ISDIR(inode->i_mode))
413 reiserfs_warning(inode->i_sb, "green-2102",
414 "Adding a truncate savelink for "
415 "a directory %k! Please report",
416 INODE_PKEY(inode));
417 set_cpu_key_k_offset(&key, 1);
418 set_cpu_key_k_type(&key, TYPE_INDIRECT);
419
420 /* item head of "safe" link */
421 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
422 4 /*length */ , 0 /*free space */ );
423 }
424 key.key_length = 3;
425
426 /* look for its place in the tree */
427 retval = search_item(inode->i_sb, &key, &path);
428 if (retval != ITEM_NOT_FOUND) {
429 if (retval != -ENOSPC)
430 reiserfs_error(inode->i_sb, "vs-2100",
431 "search_by_key (%K) returned %d", &key,
432 retval);
433 pathrelse(&path);
434 return;
435 }
436
437 /* body of "save" link */
438 link = INODE_PKEY(inode)->k_dir_id;
439
440 /* put "save" link into tree, don't charge quota to anyone */
441 retval =
442 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
443 if (retval) {
444 if (retval != -ENOSPC)
445 reiserfs_error(inode->i_sb, "vs-2120",
446 "insert_item returned %d", retval);
447 } else {
448 if (truncate)
449 REISERFS_I(inode)->i_flags |=
450 i_link_saved_truncate_mask;
451 else
452 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
453 }
454 }
455
456 /* this opens transaction unlike add_save_link */
457 int remove_save_link(struct inode *inode, int truncate)
458 {
459 struct reiserfs_transaction_handle th;
460 struct reiserfs_key key;
461 int err;
462
463 /* we are going to do one balancing only */
464 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
465 if (err)
466 return err;
467
468 /* setup key of "save" link */
469 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
470 key.k_objectid = INODE_PKEY(inode)->k_objectid;
471 if (!truncate) {
472 /* unlink, rmdir, rename */
473 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
474 1 + inode->i_sb->s_blocksize);
475 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
476 } else {
477 /* truncate */
478 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
479 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
480 }
481
482 if ((truncate &&
483 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
484 (!truncate &&
485 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
486 /* don't take quota bytes from anywhere */
487 reiserfs_delete_solid_item(&th, NULL, &key);
488 if (!truncate) {
489 reiserfs_release_objectid(&th, inode->i_ino);
490 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
491 } else
492 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
493
494 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
495 }
496
497 static void reiserfs_kill_sb(struct super_block *s)
498 {
499 if (REISERFS_SB(s)) {
500 /*
501 * Force any pending inode evictions to occur now. Any
502 * inodes to be removed that have extended attributes
503 * associated with them need to clean them up before
504 * we can release the extended attribute root dentries.
505 * shrink_dcache_for_umount will BUG if we don't release
506 * those before it's called so ->put_super is too late.
507 */
508 shrink_dcache_sb(s);
509
510 dput(REISERFS_SB(s)->xattr_root);
511 REISERFS_SB(s)->xattr_root = NULL;
512 dput(REISERFS_SB(s)->priv_root);
513 REISERFS_SB(s)->priv_root = NULL;
514 }
515
516 kill_block_super(s);
517 }
518
519 static void reiserfs_put_super(struct super_block *s)
520 {
521 struct reiserfs_transaction_handle th;
522 th.t_trans_id = 0;
523
524 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
525
526 reiserfs_write_lock(s);
527
528 /* change file system state to current state if it was mounted with read-write permissions */
529 if (!(s->s_flags & MS_RDONLY)) {
530 if (!journal_begin(&th, s, 10)) {
531 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
532 1);
533 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
534 REISERFS_SB(s)->s_mount_state);
535 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
536 }
537 }
538
539 /* note, journal_release checks for readonly mount, and can decide not
540 ** to do a journal_end
541 */
542 journal_release(&th, s);
543
544 reiserfs_free_bitmap_cache(s);
545
546 brelse(SB_BUFFER_WITH_SB(s));
547
548 print_statistics(s);
549
550 if (REISERFS_SB(s)->reserved_blocks != 0) {
551 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
552 REISERFS_SB(s)->reserved_blocks);
553 }
554
555 reiserfs_proc_info_done(s);
556
557 reiserfs_write_unlock(s);
558 mutex_destroy(&REISERFS_SB(s)->lock);
559 kfree(s->s_fs_info);
560 s->s_fs_info = NULL;
561 }
562
563 static struct kmem_cache *reiserfs_inode_cachep;
564
565 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
566 {
567 struct reiserfs_inode_info *ei;
568 ei = (struct reiserfs_inode_info *)
569 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
570 if (!ei)
571 return NULL;
572 atomic_set(&ei->openers, 0);
573 mutex_init(&ei->tailpack);
574 return &ei->vfs_inode;
575 }
576
577 static void reiserfs_i_callback(struct rcu_head *head)
578 {
579 struct inode *inode = container_of(head, struct inode, i_rcu);
580 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
581 }
582
583 static void reiserfs_destroy_inode(struct inode *inode)
584 {
585 call_rcu(&inode->i_rcu, reiserfs_i_callback);
586 }
587
588 static void init_once(void *foo)
589 {
590 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
591
592 INIT_LIST_HEAD(&ei->i_prealloc_list);
593 inode_init_once(&ei->vfs_inode);
594 }
595
596 static int init_inodecache(void)
597 {
598 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
599 sizeof(struct
600 reiserfs_inode_info),
601 0, (SLAB_RECLAIM_ACCOUNT|
602 SLAB_MEM_SPREAD),
603 init_once);
604 if (reiserfs_inode_cachep == NULL)
605 return -ENOMEM;
606 return 0;
607 }
608
609 static void destroy_inodecache(void)
610 {
611 kmem_cache_destroy(reiserfs_inode_cachep);
612 }
613
614 /* we don't mark inodes dirty, we just log them */
615 static void reiserfs_dirty_inode(struct inode *inode, int flags)
616 {
617 struct reiserfs_transaction_handle th;
618
619 int err = 0;
620 int lock_depth;
621
622 if (inode->i_sb->s_flags & MS_RDONLY) {
623 reiserfs_warning(inode->i_sb, "clm-6006",
624 "writing inode %lu on readonly FS",
625 inode->i_ino);
626 return;
627 }
628 lock_depth = reiserfs_write_lock_once(inode->i_sb);
629
630 /* this is really only used for atime updates, so they don't have
631 ** to be included in O_SYNC or fsync
632 */
633 err = journal_begin(&th, inode->i_sb, 1);
634 if (err)
635 goto out;
636
637 reiserfs_update_sd(&th, inode);
638 journal_end(&th, inode->i_sb, 1);
639
640 out:
641 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
642 }
643
644 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
645 {
646 struct super_block *s = root->d_sb;
647 struct reiserfs_journal *journal = SB_JOURNAL(s);
648 long opts = REISERFS_SB(s)->s_mount_opt;
649
650 if (opts & (1 << REISERFS_LARGETAIL))
651 seq_puts(seq, ",tails=on");
652 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
653 seq_puts(seq, ",notail");
654 /* tails=small is default so we don't show it */
655
656 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
657 seq_puts(seq, ",barrier=none");
658 /* barrier=flush is default so we don't show it */
659
660 if (opts & (1 << REISERFS_ERROR_CONTINUE))
661 seq_puts(seq, ",errors=continue");
662 else if (opts & (1 << REISERFS_ERROR_PANIC))
663 seq_puts(seq, ",errors=panic");
664 /* errors=ro is default so we don't show it */
665
666 if (opts & (1 << REISERFS_DATA_LOG))
667 seq_puts(seq, ",data=journal");
668 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
669 seq_puts(seq, ",data=writeback");
670 /* data=ordered is default so we don't show it */
671
672 if (opts & (1 << REISERFS_ATTRS))
673 seq_puts(seq, ",attrs");
674
675 if (opts & (1 << REISERFS_XATTRS_USER))
676 seq_puts(seq, ",user_xattr");
677
678 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
679 seq_puts(seq, ",expose_privroot");
680
681 if (opts & (1 << REISERFS_POSIXACL))
682 seq_puts(seq, ",acl");
683
684 if (REISERFS_SB(s)->s_jdev)
685 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
686
687 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
688 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
689
690 #ifdef CONFIG_QUOTA
691 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
692 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
693 else if (opts & (1 << REISERFS_USRQUOTA))
694 seq_puts(seq, ",usrquota");
695 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
696 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
697 else if (opts & (1 << REISERFS_GRPQUOTA))
698 seq_puts(seq, ",grpquota");
699 if (REISERFS_SB(s)->s_jquota_fmt) {
700 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
701 seq_puts(seq, ",jqfmt=vfsold");
702 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
703 seq_puts(seq, ",jqfmt=vfsv0");
704 }
705 #endif
706
707 /* Block allocator options */
708 if (opts & (1 << REISERFS_NO_BORDER))
709 seq_puts(seq, ",block-allocator=noborder");
710 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
711 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
712 if (opts & (1 << REISERFS_HASHED_RELOCATION))
713 seq_puts(seq, ",block-allocator=hashed_relocation");
714 if (opts & (1 << REISERFS_TEST4))
715 seq_puts(seq, ",block-allocator=test4");
716 show_alloc_options(seq, s);
717 return 0;
718 }
719
720 #ifdef CONFIG_QUOTA
721 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
722 size_t, loff_t);
723 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
724 loff_t);
725 #endif
726
727 static const struct super_operations reiserfs_sops = {
728 .alloc_inode = reiserfs_alloc_inode,
729 .destroy_inode = reiserfs_destroy_inode,
730 .write_inode = reiserfs_write_inode,
731 .dirty_inode = reiserfs_dirty_inode,
732 .evict_inode = reiserfs_evict_inode,
733 .put_super = reiserfs_put_super,
734 .sync_fs = reiserfs_sync_fs,
735 .freeze_fs = reiserfs_freeze,
736 .unfreeze_fs = reiserfs_unfreeze,
737 .statfs = reiserfs_statfs,
738 .remount_fs = reiserfs_remount,
739 .show_options = reiserfs_show_options,
740 #ifdef CONFIG_QUOTA
741 .quota_read = reiserfs_quota_read,
742 .quota_write = reiserfs_quota_write,
743 #endif
744 };
745
746 #ifdef CONFIG_QUOTA
747 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
748
749 static int reiserfs_write_dquot(struct dquot *);
750 static int reiserfs_acquire_dquot(struct dquot *);
751 static int reiserfs_release_dquot(struct dquot *);
752 static int reiserfs_mark_dquot_dirty(struct dquot *);
753 static int reiserfs_write_info(struct super_block *, int);
754 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
755
756 static const struct dquot_operations reiserfs_quota_operations = {
757 .write_dquot = reiserfs_write_dquot,
758 .acquire_dquot = reiserfs_acquire_dquot,
759 .release_dquot = reiserfs_release_dquot,
760 .mark_dirty = reiserfs_mark_dquot_dirty,
761 .write_info = reiserfs_write_info,
762 .alloc_dquot = dquot_alloc,
763 .destroy_dquot = dquot_destroy,
764 };
765
766 static const struct quotactl_ops reiserfs_qctl_operations = {
767 .quota_on = reiserfs_quota_on,
768 .quota_off = dquot_quota_off,
769 .quota_sync = dquot_quota_sync,
770 .get_info = dquot_get_dqinfo,
771 .set_info = dquot_set_dqinfo,
772 .get_dqblk = dquot_get_dqblk,
773 .set_dqblk = dquot_set_dqblk,
774 };
775 #endif
776
777 static const struct export_operations reiserfs_export_ops = {
778 .encode_fh = reiserfs_encode_fh,
779 .fh_to_dentry = reiserfs_fh_to_dentry,
780 .fh_to_parent = reiserfs_fh_to_parent,
781 .get_parent = reiserfs_get_parent,
782 };
783
784 /* this struct is used in reiserfs_getopt () for containing the value for those
785 mount options that have values rather than being toggles. */
786 typedef struct {
787 char *value;
788 int setmask; /* bitmask which is to set on mount_options bitmask when this
789 value is found, 0 is no bits are to be changed. */
790 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
791 value is found, 0 is no bits are to be changed. This is
792 applied BEFORE setmask */
793 } arg_desc_t;
794
795 /* Set this bit in arg_required to allow empty arguments */
796 #define REISERFS_OPT_ALLOWEMPTY 31
797
798 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
799 mount options */
800 typedef struct {
801 char *option_name;
802 int arg_required; /* 0 if argument is not required, not 0 otherwise */
803 const arg_desc_t *values; /* list of values accepted by an option */
804 int setmask; /* bitmask which is to set on mount_options bitmask when this
805 value is found, 0 is no bits are to be changed. */
806 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
807 value is found, 0 is no bits are to be changed. This is
808 applied BEFORE setmask */
809 } opt_desc_t;
810
811 /* possible values for -o data= */
812 static const arg_desc_t logging_mode[] = {
813 {"ordered", 1 << REISERFS_DATA_ORDERED,
814 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
815 {"journal", 1 << REISERFS_DATA_LOG,
816 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
817 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
818 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
819 {.value = NULL}
820 };
821
822 /* possible values for -o barrier= */
823 static const arg_desc_t barrier_mode[] = {
824 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
825 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
826 {.value = NULL}
827 };
828
829 /* possible values for "-o block-allocator=" and bits which are to be set in
830 s_mount_opt of reiserfs specific part of in-core super block */
831 static const arg_desc_t balloc[] = {
832 {"noborder", 1 << REISERFS_NO_BORDER, 0},
833 {"border", 0, 1 << REISERFS_NO_BORDER},
834 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
835 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
836 {"test4", 1 << REISERFS_TEST4, 0},
837 {"notest4", 0, 1 << REISERFS_TEST4},
838 {NULL, 0, 0}
839 };
840
841 static const arg_desc_t tails[] = {
842 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
843 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
844 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
845 {NULL, 0, 0}
846 };
847
848 static const arg_desc_t error_actions[] = {
849 {"panic", 1 << REISERFS_ERROR_PANIC,
850 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
851 {"ro-remount", 1 << REISERFS_ERROR_RO,
852 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
853 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
854 {"continue", 1 << REISERFS_ERROR_CONTINUE,
855 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
856 #endif
857 {NULL, 0, 0},
858 };
859
860 /* proceed only one option from a list *cur - string containing of mount options
861 opts - array of options which are accepted
862 opt_arg - if option is found and requires an argument and if it is specifed
863 in the input - pointer to the argument is stored here
864 bit_flags - if option requires to set a certain bit - it is set here
865 return -1 if unknown option is found, opt->arg_required otherwise */
866 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
867 char **opt_arg, unsigned long *bit_flags)
868 {
869 char *p;
870 /* foo=bar,
871 ^ ^ ^
872 | | +-- option_end
873 | +-- arg_start
874 +-- option_start
875 */
876 const opt_desc_t *opt;
877 const arg_desc_t *arg;
878
879 p = *cur;
880
881 /* assume argument cannot contain commas */
882 *cur = strchr(p, ',');
883 if (*cur) {
884 *(*cur) = '\0';
885 (*cur)++;
886 }
887
888 if (!strncmp(p, "alloc=", 6)) {
889 /* Ugly special case, probably we should redo options parser so that
890 it can understand several arguments for some options, also so that
891 it can fill several bitfields with option values. */
892 if (reiserfs_parse_alloc_options(s, p + 6)) {
893 return -1;
894 } else {
895 return 0;
896 }
897 }
898
899 /* for every option in the list */
900 for (opt = opts; opt->option_name; opt++) {
901 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
902 if (bit_flags) {
903 if (opt->clrmask ==
904 (1 << REISERFS_UNSUPPORTED_OPT))
905 reiserfs_warning(s, "super-6500",
906 "%s not supported.\n",
907 p);
908 else
909 *bit_flags &= ~opt->clrmask;
910 if (opt->setmask ==
911 (1 << REISERFS_UNSUPPORTED_OPT))
912 reiserfs_warning(s, "super-6501",
913 "%s not supported.\n",
914 p);
915 else
916 *bit_flags |= opt->setmask;
917 }
918 break;
919 }
920 }
921 if (!opt->option_name) {
922 reiserfs_warning(s, "super-6502",
923 "unknown mount option \"%s\"", p);
924 return -1;
925 }
926
927 p += strlen(opt->option_name);
928 switch (*p) {
929 case '=':
930 if (!opt->arg_required) {
931 reiserfs_warning(s, "super-6503",
932 "the option \"%s\" does not "
933 "require an argument\n",
934 opt->option_name);
935 return -1;
936 }
937 break;
938
939 case 0:
940 if (opt->arg_required) {
941 reiserfs_warning(s, "super-6504",
942 "the option \"%s\" requires an "
943 "argument\n", opt->option_name);
944 return -1;
945 }
946 break;
947 default:
948 reiserfs_warning(s, "super-6505",
949 "head of option \"%s\" is only correct\n",
950 opt->option_name);
951 return -1;
952 }
953
954 /* move to the argument, or to next option if argument is not required */
955 p++;
956
957 if (opt->arg_required
958 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
959 && !strlen(p)) {
960 /* this catches "option=," if not allowed */
961 reiserfs_warning(s, "super-6506",
962 "empty argument for \"%s\"\n",
963 opt->option_name);
964 return -1;
965 }
966
967 if (!opt->values) {
968 /* *=NULLopt_arg contains pointer to argument */
969 *opt_arg = p;
970 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
971 }
972
973 /* values possible for this option are listed in opt->values */
974 for (arg = opt->values; arg->value; arg++) {
975 if (!strcmp(p, arg->value)) {
976 if (bit_flags) {
977 *bit_flags &= ~arg->clrmask;
978 *bit_flags |= arg->setmask;
979 }
980 return opt->arg_required;
981 }
982 }
983
984 reiserfs_warning(s, "super-6506",
985 "bad value \"%s\" for option \"%s\"\n", p,
986 opt->option_name);
987 return -1;
988 }
989
990 /* returns 0 if something is wrong in option string, 1 - otherwise */
991 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
992 unsigned long *mount_options,
993 /* after the parsing phase, contains the
994 collection of bitflags defining what
995 mount options were selected. */
996 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
997 char **jdev_name,
998 unsigned int *commit_max_age,
999 char **qf_names,
1000 unsigned int *qfmt)
1001 {
1002 int c;
1003 char *arg = NULL;
1004 char *pos;
1005 opt_desc_t opts[] = {
1006 /* Compatibility stuff, so that -o notail for old setups still work */
1007 {"tails",.arg_required = 't',.values = tails},
1008 {"notail",.clrmask =
1009 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1010 {"conv",.setmask = 1 << REISERFS_CONVERT},
1011 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1012 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1013 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1014 #ifdef CONFIG_REISERFS_FS_XATTR
1015 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1016 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1017 #else
1018 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1019 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1020 #endif
1021 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1022 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1023 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1024 #else
1025 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027 #endif
1028 {.option_name = "nolog"},
1029 {"replayonly",.setmask = 1 << REPLAYONLY},
1030 {"block-allocator",.arg_required = 'a',.values = balloc},
1031 {"data",.arg_required = 'd',.values = logging_mode},
1032 {"barrier",.arg_required = 'b',.values = barrier_mode},
1033 {"resize",.arg_required = 'r',.values = NULL},
1034 {"jdev",.arg_required = 'j',.values = NULL},
1035 {"nolargeio",.arg_required = 'w',.values = NULL},
1036 {"commit",.arg_required = 'c',.values = NULL},
1037 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1038 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1039 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1040 {"errors",.arg_required = 'e',.values = error_actions},
1041 {"usrjquota",.arg_required =
1042 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1043 {"grpjquota",.arg_required =
1044 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1045 {"jqfmt",.arg_required = 'f',.values = NULL},
1046 {.option_name = NULL}
1047 };
1048
1049 *blocks = 0;
1050 if (!options || !*options)
1051 /* use default configuration: create tails, journaling on, no
1052 conversion to newest format */
1053 return 1;
1054
1055 for (pos = options; pos;) {
1056 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1057 if (c == -1)
1058 /* wrong option is given */
1059 return 0;
1060
1061 if (c == 'r') {
1062 char *p;
1063
1064 p = NULL;
1065 /* "resize=NNN" or "resize=auto" */
1066
1067 if (!strcmp(arg, "auto")) {
1068 /* From JFS code, to auto-get the size. */
1069 *blocks =
1070 s->s_bdev->bd_inode->i_size >> s->
1071 s_blocksize_bits;
1072 } else {
1073 *blocks = simple_strtoul(arg, &p, 0);
1074 if (*p != '\0') {
1075 /* NNN does not look like a number */
1076 reiserfs_warning(s, "super-6507",
1077 "bad value %s for "
1078 "-oresize\n", arg);
1079 return 0;
1080 }
1081 }
1082 }
1083
1084 if (c == 'c') {
1085 char *p = NULL;
1086 unsigned long val = simple_strtoul(arg, &p, 0);
1087 /* commit=NNN (time in seconds) */
1088 if (*p != '\0' || val >= (unsigned int)-1) {
1089 reiserfs_warning(s, "super-6508",
1090 "bad value %s for -ocommit\n",
1091 arg);
1092 return 0;
1093 }
1094 *commit_max_age = (unsigned int)val;
1095 }
1096
1097 if (c == 'w') {
1098 reiserfs_warning(s, "super-6509", "nolargeio option "
1099 "is no longer supported");
1100 return 0;
1101 }
1102
1103 if (c == 'j') {
1104 if (arg && *arg && jdev_name) {
1105 if (*jdev_name) { //Hm, already assigned?
1106 reiserfs_warning(s, "super-6510",
1107 "journal device was "
1108 "already specified to "
1109 "be %s", *jdev_name);
1110 return 0;
1111 }
1112 *jdev_name = arg;
1113 }
1114 }
1115 #ifdef CONFIG_QUOTA
1116 if (c == 'u' || c == 'g') {
1117 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1118
1119 if (sb_any_quota_loaded(s) &&
1120 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1121 reiserfs_warning(s, "super-6511",
1122 "cannot change journaled "
1123 "quota options when quota "
1124 "turned on.");
1125 return 0;
1126 }
1127 if (*arg) { /* Some filename specified? */
1128 if (REISERFS_SB(s)->s_qf_names[qtype]
1129 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1130 arg)) {
1131 reiserfs_warning(s, "super-6512",
1132 "%s quota file "
1133 "already specified.",
1134 QTYPE2NAME(qtype));
1135 return 0;
1136 }
1137 if (strchr(arg, '/')) {
1138 reiserfs_warning(s, "super-6513",
1139 "quotafile must be "
1140 "on filesystem root.");
1141 return 0;
1142 }
1143 qf_names[qtype] =
1144 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1145 if (!qf_names[qtype]) {
1146 reiserfs_warning(s, "reiserfs-2502",
1147 "not enough memory "
1148 "for storing "
1149 "quotafile name.");
1150 return 0;
1151 }
1152 strcpy(qf_names[qtype], arg);
1153 if (qtype == USRQUOTA)
1154 *mount_options |= 1 << REISERFS_USRQUOTA;
1155 else
1156 *mount_options |= 1 << REISERFS_GRPQUOTA;
1157 } else {
1158 if (qf_names[qtype] !=
1159 REISERFS_SB(s)->s_qf_names[qtype])
1160 kfree(qf_names[qtype]);
1161 qf_names[qtype] = NULL;
1162 if (qtype == USRQUOTA)
1163 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1164 else
1165 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1166 }
1167 }
1168 if (c == 'f') {
1169 if (!strcmp(arg, "vfsold"))
1170 *qfmt = QFMT_VFS_OLD;
1171 else if (!strcmp(arg, "vfsv0"))
1172 *qfmt = QFMT_VFS_V0;
1173 else {
1174 reiserfs_warning(s, "super-6514",
1175 "unknown quota format "
1176 "specified.");
1177 return 0;
1178 }
1179 if (sb_any_quota_loaded(s) &&
1180 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1181 reiserfs_warning(s, "super-6515",
1182 "cannot change journaled "
1183 "quota options when quota "
1184 "turned on.");
1185 return 0;
1186 }
1187 }
1188 #else
1189 if (c == 'u' || c == 'g' || c == 'f') {
1190 reiserfs_warning(s, "reiserfs-2503", "journaled "
1191 "quota options not supported.");
1192 return 0;
1193 }
1194 #endif
1195 }
1196
1197 #ifdef CONFIG_QUOTA
1198 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1199 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1200 reiserfs_warning(s, "super-6515",
1201 "journaled quota format not specified.");
1202 return 0;
1203 }
1204 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1205 sb_has_quota_loaded(s, USRQUOTA)) ||
1206 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1207 sb_has_quota_loaded(s, GRPQUOTA))) {
1208 reiserfs_warning(s, "super-6516", "quota options must "
1209 "be present when quota is turned on.");
1210 return 0;
1211 }
1212 #endif
1213
1214 return 1;
1215 }
1216
1217 static void switch_data_mode(struct super_block *s, unsigned long mode)
1218 {
1219 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1220 (1 << REISERFS_DATA_ORDERED) |
1221 (1 << REISERFS_DATA_WRITEBACK));
1222 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1223 }
1224
1225 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1226 {
1227 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1228 if (!reiserfs_data_log(s)) {
1229 switch_data_mode(s, REISERFS_DATA_LOG);
1230 reiserfs_info(s, "switching to journaled data mode\n");
1231 }
1232 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1233 if (!reiserfs_data_ordered(s)) {
1234 switch_data_mode(s, REISERFS_DATA_ORDERED);
1235 reiserfs_info(s, "switching to ordered data mode\n");
1236 }
1237 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1238 if (!reiserfs_data_writeback(s)) {
1239 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1240 reiserfs_info(s, "switching to writeback data mode\n");
1241 }
1242 }
1243 }
1244
1245 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1246 {
1247 int flush = (1 << REISERFS_BARRIER_FLUSH);
1248 int none = (1 << REISERFS_BARRIER_NONE);
1249 int all_barrier = flush | none;
1250
1251 if (bits & all_barrier) {
1252 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1253 if (bits & flush) {
1254 REISERFS_SB(s)->s_mount_opt |= flush;
1255 printk("reiserfs: enabling write barrier flush mode\n");
1256 } else if (bits & none) {
1257 REISERFS_SB(s)->s_mount_opt |= none;
1258 printk("reiserfs: write barriers turned off\n");
1259 }
1260 }
1261 }
1262
1263 static void handle_attrs(struct super_block *s)
1264 {
1265 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1266
1267 if (reiserfs_attrs(s)) {
1268 if (old_format_only(s)) {
1269 reiserfs_warning(s, "super-6517", "cannot support "
1270 "attributes on 3.5.x disk format");
1271 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1272 return;
1273 }
1274 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1275 reiserfs_warning(s, "super-6518", "cannot support "
1276 "attributes until flag is set in "
1277 "super-block");
1278 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1279 }
1280 }
1281 }
1282
1283 #ifdef CONFIG_QUOTA
1284 static void handle_quota_files(struct super_block *s, char **qf_names,
1285 unsigned int *qfmt)
1286 {
1287 int i;
1288
1289 for (i = 0; i < MAXQUOTAS; i++) {
1290 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1291 kfree(REISERFS_SB(s)->s_qf_names[i]);
1292 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1293 }
1294 if (*qfmt)
1295 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1296 }
1297 #endif
1298
1299 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1300 {
1301 struct reiserfs_super_block *rs;
1302 struct reiserfs_transaction_handle th;
1303 unsigned long blocks;
1304 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1305 unsigned long safe_mask = 0;
1306 unsigned int commit_max_age = (unsigned int)-1;
1307 struct reiserfs_journal *journal = SB_JOURNAL(s);
1308 char *new_opts = kstrdup(arg, GFP_KERNEL);
1309 int err;
1310 char *qf_names[MAXQUOTAS];
1311 unsigned int qfmt = 0;
1312 #ifdef CONFIG_QUOTA
1313 int i;
1314 #endif
1315
1316 reiserfs_write_lock(s);
1317
1318 #ifdef CONFIG_QUOTA
1319 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1320 #endif
1321
1322 rs = SB_DISK_SUPER_BLOCK(s);
1323
1324 if (!reiserfs_parse_options
1325 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1326 qf_names, &qfmt)) {
1327 #ifdef CONFIG_QUOTA
1328 for (i = 0; i < MAXQUOTAS; i++)
1329 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1330 kfree(qf_names[i]);
1331 #endif
1332 err = -EINVAL;
1333 goto out_err;
1334 }
1335 #ifdef CONFIG_QUOTA
1336 handle_quota_files(s, qf_names, &qfmt);
1337 #endif
1338
1339 handle_attrs(s);
1340
1341 /* Add options that are safe here */
1342 safe_mask |= 1 << REISERFS_SMALLTAIL;
1343 safe_mask |= 1 << REISERFS_LARGETAIL;
1344 safe_mask |= 1 << REISERFS_NO_BORDER;
1345 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1346 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1347 safe_mask |= 1 << REISERFS_TEST4;
1348 safe_mask |= 1 << REISERFS_ATTRS;
1349 safe_mask |= 1 << REISERFS_XATTRS_USER;
1350 safe_mask |= 1 << REISERFS_POSIXACL;
1351 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1352 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1353 safe_mask |= 1 << REISERFS_ERROR_RO;
1354 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1355 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1356 safe_mask |= 1 << REISERFS_USRQUOTA;
1357 safe_mask |= 1 << REISERFS_GRPQUOTA;
1358
1359 /* Update the bitmask, taking care to keep
1360 * the bits we're not allowed to change here */
1361 REISERFS_SB(s)->s_mount_opt =
1362 (REISERFS_SB(s)->
1363 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1364
1365 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1366 journal->j_max_commit_age = commit_max_age;
1367 journal->j_max_trans_age = commit_max_age;
1368 } else if (commit_max_age == 0) {
1369 /* 0 means restore defaults. */
1370 journal->j_max_commit_age = journal->j_default_max_commit_age;
1371 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1372 }
1373
1374 if (blocks) {
1375 err = reiserfs_resize(s, blocks);
1376 if (err != 0)
1377 goto out_err;
1378 }
1379
1380 if (*mount_flags & MS_RDONLY) {
1381 reiserfs_xattr_init(s, *mount_flags);
1382 /* remount read-only */
1383 if (s->s_flags & MS_RDONLY)
1384 /* it is read-only already */
1385 goto out_ok;
1386
1387 err = dquot_suspend(s, -1);
1388 if (err < 0)
1389 goto out_err;
1390
1391 /* try to remount file system with read-only permissions */
1392 if (sb_umount_state(rs) == REISERFS_VALID_FS
1393 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1394 goto out_ok;
1395 }
1396
1397 err = journal_begin(&th, s, 10);
1398 if (err)
1399 goto out_err;
1400
1401 /* Mounting a rw partition read-only. */
1402 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1403 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1404 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1405 } else {
1406 /* remount read-write */
1407 if (!(s->s_flags & MS_RDONLY)) {
1408 reiserfs_xattr_init(s, *mount_flags);
1409 goto out_ok; /* We are read-write already */
1410 }
1411
1412 if (reiserfs_is_journal_aborted(journal)) {
1413 err = journal->j_errno;
1414 goto out_err;
1415 }
1416
1417 handle_data_mode(s, mount_options);
1418 handle_barrier_mode(s, mount_options);
1419 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1420 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1421 err = journal_begin(&th, s, 10);
1422 if (err)
1423 goto out_err;
1424
1425 /* Mount a partition which is read-only, read-write */
1426 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1427 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1428 s->s_flags &= ~MS_RDONLY;
1429 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1430 if (!old_format_only(s))
1431 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1432 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1433 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1434 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1435 }
1436 /* this will force a full flush of all journal lists */
1437 SB_JOURNAL(s)->j_must_wait = 1;
1438 err = journal_end(&th, s, 10);
1439 if (err)
1440 goto out_err;
1441
1442 if (!(*mount_flags & MS_RDONLY)) {
1443 dquot_resume(s, -1);
1444 finish_unfinished(s);
1445 reiserfs_xattr_init(s, *mount_flags);
1446 }
1447
1448 out_ok:
1449 replace_mount_options(s, new_opts);
1450 reiserfs_write_unlock(s);
1451 return 0;
1452
1453 out_err:
1454 kfree(new_opts);
1455 reiserfs_write_unlock(s);
1456 return err;
1457 }
1458
1459 static int read_super_block(struct super_block *s, int offset)
1460 {
1461 struct buffer_head *bh;
1462 struct reiserfs_super_block *rs;
1463 int fs_blocksize;
1464
1465 bh = sb_bread(s, offset / s->s_blocksize);
1466 if (!bh) {
1467 reiserfs_warning(s, "sh-2006",
1468 "bread failed (dev %s, block %lu, size %lu)",
1469 reiserfs_bdevname(s), offset / s->s_blocksize,
1470 s->s_blocksize);
1471 return 1;
1472 }
1473
1474 rs = (struct reiserfs_super_block *)bh->b_data;
1475 if (!is_any_reiserfs_magic_string(rs)) {
1476 brelse(bh);
1477 return 1;
1478 }
1479 //
1480 // ok, reiserfs signature (old or new) found in at the given offset
1481 //
1482 fs_blocksize = sb_blocksize(rs);
1483 brelse(bh);
1484 sb_set_blocksize(s, fs_blocksize);
1485
1486 bh = sb_bread(s, offset / s->s_blocksize);
1487 if (!bh) {
1488 reiserfs_warning(s, "sh-2007",
1489 "bread failed (dev %s, block %lu, size %lu)",
1490 reiserfs_bdevname(s), offset / s->s_blocksize,
1491 s->s_blocksize);
1492 return 1;
1493 }
1494
1495 rs = (struct reiserfs_super_block *)bh->b_data;
1496 if (sb_blocksize(rs) != s->s_blocksize) {
1497 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1498 "filesystem on (dev %s, block %Lu, size %lu)",
1499 reiserfs_bdevname(s),
1500 (unsigned long long)bh->b_blocknr,
1501 s->s_blocksize);
1502 brelse(bh);
1503 return 1;
1504 }
1505
1506 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1507 brelse(bh);
1508 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1509 "--rebuild-tree run detected. Please run\n"
1510 "reiserfsck --rebuild-tree and wait for a "
1511 "completion. If that fails\n"
1512 "get newer reiserfsprogs package");
1513 return 1;
1514 }
1515
1516 SB_BUFFER_WITH_SB(s) = bh;
1517 SB_DISK_SUPER_BLOCK(s) = rs;
1518
1519 if (is_reiserfs_jr(rs)) {
1520 /* magic is of non-standard journal filesystem, look at s_version to
1521 find which format is in use */
1522 if (sb_version(rs) == REISERFS_VERSION_2)
1523 reiserfs_info(s, "found reiserfs format \"3.6\""
1524 " with non-standard journal\n");
1525 else if (sb_version(rs) == REISERFS_VERSION_1)
1526 reiserfs_info(s, "found reiserfs format \"3.5\""
1527 " with non-standard journal\n");
1528 else {
1529 reiserfs_warning(s, "sh-2012", "found unknown "
1530 "format \"%u\" of reiserfs with "
1531 "non-standard magic", sb_version(rs));
1532 return 1;
1533 }
1534 } else
1535 /* s_version of standard format may contain incorrect information,
1536 so we just look at the magic string */
1537 reiserfs_info(s,
1538 "found reiserfs format \"%s\" with standard journal\n",
1539 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1540
1541 s->s_op = &reiserfs_sops;
1542 s->s_export_op = &reiserfs_export_ops;
1543 #ifdef CONFIG_QUOTA
1544 s->s_qcop = &reiserfs_qctl_operations;
1545 s->dq_op = &reiserfs_quota_operations;
1546 #endif
1547
1548 /* new format is limited by the 32 bit wide i_blocks field, want to
1549 ** be one full block below that.
1550 */
1551 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1552 return 0;
1553 }
1554
1555 /* after journal replay, reread all bitmap and super blocks */
1556 static int reread_meta_blocks(struct super_block *s)
1557 {
1558 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1559 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1560 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1561 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1562 return 1;
1563 }
1564
1565 return 0;
1566 }
1567
1568 /////////////////////////////////////////////////////
1569 // hash detection stuff
1570
1571 // if root directory is empty - we set default - Yura's - hash and
1572 // warn about it
1573 // FIXME: we look for only one name in a directory. If tea and yura
1574 // bith have the same value - we ask user to send report to the
1575 // mailing list
1576 static __u32 find_hash_out(struct super_block *s)
1577 {
1578 int retval;
1579 struct inode *inode;
1580 struct cpu_key key;
1581 INITIALIZE_PATH(path);
1582 struct reiserfs_dir_entry de;
1583 __u32 hash = DEFAULT_HASH;
1584
1585 inode = s->s_root->d_inode;
1586
1587 do { // Some serious "goto"-hater was there ;)
1588 u32 teahash, r5hash, yurahash;
1589
1590 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1591 retval = search_by_entry_key(s, &key, &path, &de);
1592 if (retval == IO_ERROR) {
1593 pathrelse(&path);
1594 return UNSET_HASH;
1595 }
1596 if (retval == NAME_NOT_FOUND)
1597 de.de_entry_num--;
1598 set_de_name_and_namelen(&de);
1599 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1600 /* allow override in this case */
1601 if (reiserfs_rupasov_hash(s)) {
1602 hash = YURA_HASH;
1603 }
1604 reiserfs_info(s, "FS seems to be empty, autodetect "
1605 "is using the default hash\n");
1606 break;
1607 }
1608 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1609 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1610 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1611 if (((teahash == r5hash)
1612 &&
1613 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1614 == r5hash)) || ((teahash == yurahash)
1615 && (yurahash ==
1616 GET_HASH_VALUE(deh_offset
1617 (&
1618 (de.
1619 de_deh[de.
1620 de_entry_num])))))
1621 || ((r5hash == yurahash)
1622 && (yurahash ==
1623 GET_HASH_VALUE(deh_offset
1624 (&(de.de_deh[de.de_entry_num])))))) {
1625 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1626 "automatically detect hash function. "
1627 "Please mount with -o "
1628 "hash={tea,rupasov,r5}");
1629 hash = UNSET_HASH;
1630 break;
1631 }
1632 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1633 yurahash)
1634 hash = YURA_HASH;
1635 else if (GET_HASH_VALUE
1636 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1637 hash = TEA_HASH;
1638 else if (GET_HASH_VALUE
1639 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1640 hash = R5_HASH;
1641 else {
1642 reiserfs_warning(s, "reiserfs-2506",
1643 "Unrecognised hash function");
1644 hash = UNSET_HASH;
1645 }
1646 } while (0);
1647
1648 pathrelse(&path);
1649 return hash;
1650 }
1651
1652 // finds out which hash names are sorted with
1653 static int what_hash(struct super_block *s)
1654 {
1655 __u32 code;
1656
1657 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1658
1659 /* reiserfs_hash_detect() == true if any of the hash mount options
1660 ** were used. We must check them to make sure the user isn't
1661 ** using a bad hash value
1662 */
1663 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1664 code = find_hash_out(s);
1665
1666 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1667 /* detection has found the hash, and we must check against the
1668 ** mount options
1669 */
1670 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1671 reiserfs_warning(s, "reiserfs-2507",
1672 "Error, %s hash detected, "
1673 "unable to force rupasov hash",
1674 reiserfs_hashname(code));
1675 code = UNSET_HASH;
1676 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1677 reiserfs_warning(s, "reiserfs-2508",
1678 "Error, %s hash detected, "
1679 "unable to force tea hash",
1680 reiserfs_hashname(code));
1681 code = UNSET_HASH;
1682 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1683 reiserfs_warning(s, "reiserfs-2509",
1684 "Error, %s hash detected, "
1685 "unable to force r5 hash",
1686 reiserfs_hashname(code));
1687 code = UNSET_HASH;
1688 }
1689 } else {
1690 /* find_hash_out was not called or could not determine the hash */
1691 if (reiserfs_rupasov_hash(s)) {
1692 code = YURA_HASH;
1693 } else if (reiserfs_tea_hash(s)) {
1694 code = TEA_HASH;
1695 } else if (reiserfs_r5_hash(s)) {
1696 code = R5_HASH;
1697 }
1698 }
1699
1700 /* if we are mounted RW, and we have a new valid hash code, update
1701 ** the super
1702 */
1703 if (code != UNSET_HASH &&
1704 !(s->s_flags & MS_RDONLY) &&
1705 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1706 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1707 }
1708 return code;
1709 }
1710
1711 // return pointer to appropriate function
1712 static hashf_t hash_function(struct super_block *s)
1713 {
1714 switch (what_hash(s)) {
1715 case TEA_HASH:
1716 reiserfs_info(s, "Using tea hash to sort names\n");
1717 return keyed_hash;
1718 case YURA_HASH:
1719 reiserfs_info(s, "Using rupasov hash to sort names\n");
1720 return yura_hash;
1721 case R5_HASH:
1722 reiserfs_info(s, "Using r5 hash to sort names\n");
1723 return r5_hash;
1724 }
1725 return NULL;
1726 }
1727
1728 // this is used to set up correct value for old partitions
1729 static int function2code(hashf_t func)
1730 {
1731 if (func == keyed_hash)
1732 return TEA_HASH;
1733 if (func == yura_hash)
1734 return YURA_HASH;
1735 if (func == r5_hash)
1736 return R5_HASH;
1737
1738 BUG(); // should never happen
1739
1740 return 0;
1741 }
1742
1743 #define SWARN(silent, s, id, ...) \
1744 if (!(silent)) \
1745 reiserfs_warning(s, id, __VA_ARGS__)
1746
1747 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1748 {
1749 struct inode *root_inode;
1750 struct reiserfs_transaction_handle th;
1751 int old_format = 0;
1752 unsigned long blocks;
1753 unsigned int commit_max_age = 0;
1754 int jinit_done = 0;
1755 struct reiserfs_iget_args args;
1756 struct reiserfs_super_block *rs;
1757 char *jdev_name;
1758 struct reiserfs_sb_info *sbi;
1759 int errval = -EINVAL;
1760 char *qf_names[MAXQUOTAS] = {};
1761 unsigned int qfmt = 0;
1762
1763 save_mount_options(s, data);
1764
1765 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1766 if (!sbi)
1767 return -ENOMEM;
1768 s->s_fs_info = sbi;
1769 /* Set default values for options: non-aggressive tails, RO on errors */
1770 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1771 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1772 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1773 /* no preallocation minimum, be smart in
1774 reiserfs_file_write instead */
1775 sbi->s_alloc_options.preallocmin = 0;
1776 /* Preallocate by 16 blocks (17-1) at once */
1777 sbi->s_alloc_options.preallocsize = 17;
1778 /* setup default block allocator options */
1779 reiserfs_init_alloc_options(s);
1780
1781 spin_lock_init(&sbi->old_work_lock);
1782 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1783 mutex_init(&sbi->lock);
1784 sbi->lock_depth = -1;
1785
1786 jdev_name = NULL;
1787 if (reiserfs_parse_options
1788 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1789 &commit_max_age, qf_names, &qfmt) == 0) {
1790 goto error_unlocked;
1791 }
1792 if (jdev_name && jdev_name[0]) {
1793 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1794 if (!sbi->s_jdev) {
1795 SWARN(silent, s, "", "Cannot allocate memory for "
1796 "journal device name");
1797 goto error;
1798 }
1799 }
1800 #ifdef CONFIG_QUOTA
1801 handle_quota_files(s, qf_names, &qfmt);
1802 #endif
1803
1804 if (blocks) {
1805 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1806 goto error_unlocked;
1807 }
1808
1809 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1810 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1811 old_format = 1;
1812 /* try new format (64-th 1k block), which can contain reiserfs super block */
1813 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1814 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1815 reiserfs_bdevname(s));
1816 goto error_unlocked;
1817 }
1818
1819 rs = SB_DISK_SUPER_BLOCK(s);
1820 /* Let's do basic sanity check to verify that underlying device is not
1821 smaller than the filesystem. If the check fails then abort and scream,
1822 because bad stuff will happen otherwise. */
1823 if (s->s_bdev && s->s_bdev->bd_inode
1824 && i_size_read(s->s_bdev->bd_inode) <
1825 sb_block_count(rs) * sb_blocksize(rs)) {
1826 SWARN(silent, s, "", "Filesystem cannot be "
1827 "mounted because it is bigger than the device");
1828 SWARN(silent, s, "", "You may need to run fsck "
1829 "or increase size of your LVM partition");
1830 SWARN(silent, s, "", "Or may be you forgot to "
1831 "reboot after fdisk when it told you to");
1832 goto error_unlocked;
1833 }
1834
1835 sbi->s_mount_state = SB_REISERFS_STATE(s);
1836 sbi->s_mount_state = REISERFS_VALID_FS;
1837
1838 if ((errval = reiserfs_init_bitmap_cache(s))) {
1839 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1840 goto error_unlocked;
1841 }
1842
1843 errval = -EINVAL;
1844 #ifdef CONFIG_REISERFS_CHECK
1845 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1846 SWARN(silent, s, "", "- it is slow mode for debugging.");
1847 #endif
1848
1849 /* make data=ordered the default */
1850 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1851 !reiserfs_data_writeback(s)) {
1852 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1853 }
1854
1855 if (reiserfs_data_log(s)) {
1856 reiserfs_info(s, "using journaled data mode\n");
1857 } else if (reiserfs_data_ordered(s)) {
1858 reiserfs_info(s, "using ordered data mode\n");
1859 } else {
1860 reiserfs_info(s, "using writeback data mode\n");
1861 }
1862 if (reiserfs_barrier_flush(s)) {
1863 printk("reiserfs: using flush barriers\n");
1864 }
1865
1866 // set_device_ro(s->s_dev, 1) ;
1867 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1868 SWARN(silent, s, "sh-2022",
1869 "unable to initialize journal space");
1870 goto error_unlocked;
1871 } else {
1872 jinit_done = 1; /* once this is set, journal_release must be called
1873 ** if we error out of the mount
1874 */
1875 }
1876
1877 if (reread_meta_blocks(s)) {
1878 SWARN(silent, s, "jmacd-9",
1879 "unable to reread meta blocks after journal init");
1880 goto error_unlocked;
1881 }
1882
1883 if (replay_only(s))
1884 goto error_unlocked;
1885
1886 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1887 SWARN(silent, s, "clm-7000",
1888 "Detected readonly device, marking FS readonly");
1889 s->s_flags |= MS_RDONLY;
1890 }
1891 args.objectid = REISERFS_ROOT_OBJECTID;
1892 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1893 root_inode =
1894 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1895 reiserfs_init_locked_inode, (void *)(&args));
1896 if (!root_inode) {
1897 SWARN(silent, s, "jmacd-10", "get root inode failed");
1898 goto error_unlocked;
1899 }
1900
1901 /*
1902 * This path assumed to be called with the BKL in the old times.
1903 * Now we have inherited the big reiserfs lock from it and many
1904 * reiserfs helpers called in the mount path and elsewhere require
1905 * this lock to be held even if it's not always necessary. Let's be
1906 * conservative and hold it early. The window can be reduced after
1907 * careful review of the code.
1908 */
1909 reiserfs_write_lock(s);
1910
1911 if (root_inode->i_state & I_NEW) {
1912 reiserfs_read_locked_inode(root_inode, &args);
1913 unlock_new_inode(root_inode);
1914 }
1915
1916 s->s_root = d_make_root(root_inode);
1917 if (!s->s_root)
1918 goto error;
1919 // define and initialize hash function
1920 sbi->s_hash_function = hash_function(s);
1921 if (sbi->s_hash_function == NULL) {
1922 dput(s->s_root);
1923 s->s_root = NULL;
1924 goto error;
1925 }
1926
1927 if (is_reiserfs_3_5(rs)
1928 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1929 set_bit(REISERFS_3_5, &(sbi->s_properties));
1930 else if (old_format)
1931 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1932 else
1933 set_bit(REISERFS_3_6, &(sbi->s_properties));
1934
1935 if (!(s->s_flags & MS_RDONLY)) {
1936
1937 errval = journal_begin(&th, s, 1);
1938 if (errval) {
1939 dput(s->s_root);
1940 s->s_root = NULL;
1941 goto error;
1942 }
1943 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1944
1945 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1946 set_sb_fs_state(rs, 0);
1947
1948 /* Clear out s_bmap_nr if it would wrap. We can handle this
1949 * case, but older revisions can't. This will cause the
1950 * file system to fail mount on those older implementations,
1951 * avoiding corruption. -jeffm */
1952 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1953 sb_bmap_nr(rs) != 0) {
1954 reiserfs_warning(s, "super-2030", "This file system "
1955 "claims to use %u bitmap blocks in "
1956 "its super block, but requires %u. "
1957 "Clearing to zero.", sb_bmap_nr(rs),
1958 reiserfs_bmap_count(s));
1959
1960 set_sb_bmap_nr(rs, 0);
1961 }
1962
1963 if (old_format_only(s)) {
1964 /* filesystem of format 3.5 either with standard or non-standard
1965 journal */
1966 if (convert_reiserfs(s)) {
1967 /* and -o conv is given */
1968 if (!silent)
1969 reiserfs_info(s,
1970 "converting 3.5 filesystem to the 3.6 format");
1971
1972 if (is_reiserfs_3_5(rs))
1973 /* put magic string of 3.6 format. 2.2 will not be able to
1974 mount this filesystem anymore */
1975 memcpy(rs->s_v1.s_magic,
1976 reiserfs_3_6_magic_string,
1977 sizeof
1978 (reiserfs_3_6_magic_string));
1979
1980 set_sb_version(rs, REISERFS_VERSION_2);
1981 reiserfs_convert_objectid_map_v1(s);
1982 set_bit(REISERFS_3_6, &(sbi->s_properties));
1983 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1984 } else if (!silent) {
1985 reiserfs_info(s, "using 3.5.x disk format\n");
1986 }
1987 } else
1988 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1989
1990
1991 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1992 errval = journal_end(&th, s, 1);
1993 if (errval) {
1994 dput(s->s_root);
1995 s->s_root = NULL;
1996 goto error;
1997 }
1998
1999 if ((errval = reiserfs_lookup_privroot(s)) ||
2000 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2001 dput(s->s_root);
2002 s->s_root = NULL;
2003 goto error;
2004 }
2005
2006 /* look for files which were to be removed in previous session */
2007 finish_unfinished(s);
2008 } else {
2009 if (old_format_only(s) && !silent) {
2010 reiserfs_info(s, "using 3.5.x disk format\n");
2011 }
2012
2013 if ((errval = reiserfs_lookup_privroot(s)) ||
2014 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2015 dput(s->s_root);
2016 s->s_root = NULL;
2017 goto error;
2018 }
2019 }
2020 // mark hash in super block: it could be unset. overwrite should be ok
2021 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2022
2023 handle_attrs(s);
2024
2025 reiserfs_proc_info_init(s);
2026
2027 init_waitqueue_head(&(sbi->s_wait));
2028 spin_lock_init(&sbi->bitmap_lock);
2029
2030 reiserfs_write_unlock(s);
2031
2032 return (0);
2033
2034 error:
2035 reiserfs_write_unlock(s);
2036
2037 error_unlocked:
2038 /* kill the commit thread, free journal ram */
2039 if (jinit_done) {
2040 reiserfs_write_lock(s);
2041 journal_release_error(NULL, s);
2042 reiserfs_write_unlock(s);
2043 }
2044
2045 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2046
2047 reiserfs_free_bitmap_cache(s);
2048 if (SB_BUFFER_WITH_SB(s))
2049 brelse(SB_BUFFER_WITH_SB(s));
2050 #ifdef CONFIG_QUOTA
2051 {
2052 int j;
2053 for (j = 0; j < MAXQUOTAS; j++)
2054 kfree(qf_names[j]);
2055 }
2056 #endif
2057 kfree(sbi);
2058
2059 s->s_fs_info = NULL;
2060 return errval;
2061 }
2062
2063 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2064 {
2065 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2066
2067 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2068 buf->f_bfree = sb_free_blocks(rs);
2069 buf->f_bavail = buf->f_bfree;
2070 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2071 buf->f_bsize = dentry->d_sb->s_blocksize;
2072 /* changed to accommodate gcc folks. */
2073 buf->f_type = REISERFS_SUPER_MAGIC;
2074 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2075 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2076 sizeof(rs->s_uuid)/2);
2077
2078 return 0;
2079 }
2080
2081 #ifdef CONFIG_QUOTA
2082 static int reiserfs_write_dquot(struct dquot *dquot)
2083 {
2084 struct reiserfs_transaction_handle th;
2085 int ret, err;
2086
2087 reiserfs_write_lock(dquot->dq_sb);
2088 ret =
2089 journal_begin(&th, dquot->dq_sb,
2090 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2091 if (ret)
2092 goto out;
2093 ret = dquot_commit(dquot);
2094 err =
2095 journal_end(&th, dquot->dq_sb,
2096 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2097 if (!ret && err)
2098 ret = err;
2099 out:
2100 reiserfs_write_unlock(dquot->dq_sb);
2101 return ret;
2102 }
2103
2104 static int reiserfs_acquire_dquot(struct dquot *dquot)
2105 {
2106 struct reiserfs_transaction_handle th;
2107 int ret, err;
2108
2109 reiserfs_write_lock(dquot->dq_sb);
2110 ret =
2111 journal_begin(&th, dquot->dq_sb,
2112 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2113 if (ret)
2114 goto out;
2115 ret = dquot_acquire(dquot);
2116 err =
2117 journal_end(&th, dquot->dq_sb,
2118 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2119 if (!ret && err)
2120 ret = err;
2121 out:
2122 reiserfs_write_unlock(dquot->dq_sb);
2123 return ret;
2124 }
2125
2126 static int reiserfs_release_dquot(struct dquot *dquot)
2127 {
2128 struct reiserfs_transaction_handle th;
2129 int ret, err;
2130
2131 reiserfs_write_lock(dquot->dq_sb);
2132 ret =
2133 journal_begin(&th, dquot->dq_sb,
2134 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2135 if (ret) {
2136 /* Release dquot anyway to avoid endless cycle in dqput() */
2137 dquot_release(dquot);
2138 goto out;
2139 }
2140 ret = dquot_release(dquot);
2141 err =
2142 journal_end(&th, dquot->dq_sb,
2143 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2144 if (!ret && err)
2145 ret = err;
2146 out:
2147 reiserfs_write_unlock(dquot->dq_sb);
2148 return ret;
2149 }
2150
2151 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2152 {
2153 /* Are we journaling quotas? */
2154 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2155 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2156 dquot_mark_dquot_dirty(dquot);
2157 return reiserfs_write_dquot(dquot);
2158 } else
2159 return dquot_mark_dquot_dirty(dquot);
2160 }
2161
2162 static int reiserfs_write_info(struct super_block *sb, int type)
2163 {
2164 struct reiserfs_transaction_handle th;
2165 int ret, err;
2166
2167 /* Data block + inode block */
2168 reiserfs_write_lock(sb);
2169 ret = journal_begin(&th, sb, 2);
2170 if (ret)
2171 goto out;
2172 ret = dquot_commit_info(sb, type);
2173 err = journal_end(&th, sb, 2);
2174 if (!ret && err)
2175 ret = err;
2176 out:
2177 reiserfs_write_unlock(sb);
2178 return ret;
2179 }
2180
2181 /*
2182 * Turn on quotas during mount time - we need to find the quota file and such...
2183 */
2184 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2185 {
2186 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2187 REISERFS_SB(sb)->s_jquota_fmt, type);
2188 }
2189
2190 /*
2191 * Standard function to be called on quota_on
2192 */
2193 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2194 struct path *path)
2195 {
2196 int err;
2197 struct inode *inode;
2198 struct reiserfs_transaction_handle th;
2199 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2200
2201 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
2202 return -EINVAL;
2203
2204 /* Quotafile not on the same filesystem? */
2205 if (path->dentry->d_sb != sb) {
2206 err = -EXDEV;
2207 goto out;
2208 }
2209 inode = path->dentry->d_inode;
2210 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2211 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2212 err = reiserfs_unpack(inode, NULL);
2213 if (err) {
2214 reiserfs_warning(sb, "super-6520",
2215 "Unpacking tail of quota file failed"
2216 " (%d). Cannot turn on quotas.", err);
2217 err = -EINVAL;
2218 goto out;
2219 }
2220 mark_inode_dirty(inode);
2221 }
2222 /* Journaling quota? */
2223 if (REISERFS_SB(sb)->s_qf_names[type]) {
2224 /* Quotafile not of fs root? */
2225 if (path->dentry->d_parent != sb->s_root)
2226 reiserfs_warning(sb, "super-6521",
2227 "Quota file not on filesystem root. "
2228 "Journalled quota will not work.");
2229 }
2230
2231 /*
2232 * When we journal data on quota file, we have to flush journal to see
2233 * all updates to the file when we bypass pagecache...
2234 */
2235 if (reiserfs_file_data_log(inode)) {
2236 /* Just start temporary transaction and finish it */
2237 err = journal_begin(&th, sb, 1);
2238 if (err)
2239 goto out;
2240 err = journal_end_sync(&th, sb, 1);
2241 if (err)
2242 goto out;
2243 }
2244 err = dquot_quota_on(sb, type, format_id, path);
2245 out:
2246 return err;
2247 }
2248
2249 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2250 * acquiring the locks... As quota files are never truncated and quota code
2251 * itself serializes the operations (and no one else should touch the files)
2252 * we don't have to be afraid of races */
2253 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2254 size_t len, loff_t off)
2255 {
2256 struct inode *inode = sb_dqopt(sb)->files[type];
2257 unsigned long blk = off >> sb->s_blocksize_bits;
2258 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2259 size_t toread;
2260 struct buffer_head tmp_bh, *bh;
2261 loff_t i_size = i_size_read(inode);
2262
2263 if (off > i_size)
2264 return 0;
2265 if (off + len > i_size)
2266 len = i_size - off;
2267 toread = len;
2268 while (toread > 0) {
2269 tocopy =
2270 sb->s_blocksize - offset <
2271 toread ? sb->s_blocksize - offset : toread;
2272 tmp_bh.b_state = 0;
2273 /* Quota files are without tails so we can safely use this function */
2274 reiserfs_write_lock(sb);
2275 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2276 reiserfs_write_unlock(sb);
2277 if (err)
2278 return err;
2279 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2280 memset(data, 0, tocopy);
2281 else {
2282 bh = sb_bread(sb, tmp_bh.b_blocknr);
2283 if (!bh)
2284 return -EIO;
2285 memcpy(data, bh->b_data + offset, tocopy);
2286 brelse(bh);
2287 }
2288 offset = 0;
2289 toread -= tocopy;
2290 data += tocopy;
2291 blk++;
2292 }
2293 return len;
2294 }
2295
2296 /* Write to quotafile (we know the transaction is already started and has
2297 * enough credits) */
2298 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2299 const char *data, size_t len, loff_t off)
2300 {
2301 struct inode *inode = sb_dqopt(sb)->files[type];
2302 unsigned long blk = off >> sb->s_blocksize_bits;
2303 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2304 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2305 size_t towrite = len;
2306 struct buffer_head tmp_bh, *bh;
2307
2308 if (!current->journal_info) {
2309 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2310 " cancelled because transaction is not started.\n",
2311 (unsigned long long)off, (unsigned long long)len);
2312 return -EIO;
2313 }
2314 while (towrite > 0) {
2315 tocopy = sb->s_blocksize - offset < towrite ?
2316 sb->s_blocksize - offset : towrite;
2317 tmp_bh.b_state = 0;
2318 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2319 if (err)
2320 goto out;
2321 if (offset || tocopy != sb->s_blocksize)
2322 bh = sb_bread(sb, tmp_bh.b_blocknr);
2323 else
2324 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2325 if (!bh) {
2326 err = -EIO;
2327 goto out;
2328 }
2329 lock_buffer(bh);
2330 memcpy(bh->b_data + offset, data, tocopy);
2331 flush_dcache_page(bh->b_page);
2332 set_buffer_uptodate(bh);
2333 unlock_buffer(bh);
2334 reiserfs_prepare_for_journal(sb, bh, 1);
2335 journal_mark_dirty(current->journal_info, sb, bh);
2336 if (!journal_quota)
2337 reiserfs_add_ordered_list(inode, bh);
2338 brelse(bh);
2339 offset = 0;
2340 towrite -= tocopy;
2341 data += tocopy;
2342 blk++;
2343 }
2344 out:
2345 if (len == towrite)
2346 return err;
2347 if (inode->i_size < off + len - towrite)
2348 i_size_write(inode, off + len - towrite);
2349 inode->i_version++;
2350 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2351 mark_inode_dirty(inode);
2352 return len - towrite;
2353 }
2354
2355 #endif
2356
2357 static struct dentry *get_super_block(struct file_system_type *fs_type,
2358 int flags, const char *dev_name,
2359 void *data)
2360 {
2361 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2362 }
2363
2364 static int __init init_reiserfs_fs(void)
2365 {
2366 int ret;
2367
2368 if ((ret = init_inodecache())) {
2369 return ret;
2370 }
2371
2372 reiserfs_proc_info_global_init();
2373
2374 ret = register_filesystem(&reiserfs_fs_type);
2375
2376 if (ret == 0) {
2377 return 0;
2378 }
2379
2380 reiserfs_proc_info_global_done();
2381 destroy_inodecache();
2382
2383 return ret;
2384 }
2385
2386 static void __exit exit_reiserfs_fs(void)
2387 {
2388 reiserfs_proc_info_global_done();
2389 unregister_filesystem(&reiserfs_fs_type);
2390 destroy_inodecache();
2391 }
2392
2393 struct file_system_type reiserfs_fs_type = {
2394 .owner = THIS_MODULE,
2395 .name = "reiserfs",
2396 .mount = get_super_block,
2397 .kill_sb = reiserfs_kill_sb,
2398 .fs_flags = FS_REQUIRES_DEV,
2399 };
2400
2401 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2402 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2403 MODULE_LICENSE("GPL");
2404
2405 module_init(init_reiserfs_fs);
2406 module_exit(exit_reiserfs_fs);
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