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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / fs / reiserfs / super.c
blobe12d8b97cd4dbf3c4c7dc249d42c66a8aeadc4bb
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 <linux/reiserfs_fs.h>
20 #include <linux/reiserfs_acl.h>
21 #include <linux/reiserfs_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 reiserfs_write_lock(s);
72 if (!journal_begin(&th, s, 1))
73 if (!journal_end_sync(&th, s, 1))
74 reiserfs_flush_old_commits(s);
75 s->s_dirt = 0; /* Even if it's not true.
76 * We'll loop forever in sync_supers otherwise */
77 reiserfs_write_unlock(s);
78 return 0;
79 }
80
81 static void reiserfs_write_super(struct super_block *s)
82 {
83 reiserfs_sync_fs(s, 1);
84 }
85
86 static int reiserfs_freeze(struct super_block *s)
87 {
88 struct reiserfs_transaction_handle th;
89 reiserfs_write_lock(s);
90 if (!(s->s_flags & MS_RDONLY)) {
91 int err = journal_begin(&th, s, 1);
92 if (err) {
93 reiserfs_block_writes(&th);
94 } else {
95 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
96 1);
97 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
98 reiserfs_block_writes(&th);
99 journal_end_sync(&th, s, 1);
100 }
101 }
102 s->s_dirt = 0;
103 reiserfs_write_unlock(s);
104 return 0;
105 }
106
107 static int reiserfs_unfreeze(struct super_block *s)
108 {
109 reiserfs_allow_writes(s);
110 return 0;
111 }
112
113 extern const struct in_core_key MAX_IN_CORE_KEY;
114
115 /* this is used to delete "save link" when there are no items of a
116 file it points to. It can either happen if unlink is completed but
117 "save unlink" removal, or if file has both unlink and truncate
118 pending and as unlink completes first (because key of "save link"
119 protecting unlink is bigger that a key lf "save link" which
120 protects truncate), so there left no items to make truncate
121 completion on */
122 static int remove_save_link_only(struct super_block *s,
123 struct reiserfs_key *key, int oid_free)
124 {
125 struct reiserfs_transaction_handle th;
126 int err;
127
128 /* we are going to do one balancing */
129 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
130 if (err)
131 return err;
132
133 reiserfs_delete_solid_item(&th, NULL, key);
134 if (oid_free)
135 /* removals are protected by direct items */
136 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
137
138 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
139 }
140
141 #ifdef CONFIG_QUOTA
142 static int reiserfs_quota_on_mount(struct super_block *, int);
143 #endif
144
145 /* look for uncompleted unlinks and truncates and complete them */
146 static int finish_unfinished(struct super_block *s)
147 {
148 INITIALIZE_PATH(path);
149 struct cpu_key max_cpu_key, obj_key;
150 struct reiserfs_key save_link_key, last_inode_key;
151 int retval = 0;
152 struct item_head *ih;
153 struct buffer_head *bh;
154 int item_pos;
155 char *item;
156 int done;
157 struct inode *inode;
158 int truncate;
159 #ifdef CONFIG_QUOTA
160 int i;
161 int ms_active_set;
162 int quota_enabled[MAXQUOTAS];
163 #endif
164
165 /* compose key to look for "save" links */
166 max_cpu_key.version = KEY_FORMAT_3_5;
167 max_cpu_key.on_disk_key.k_dir_id = ~0U;
168 max_cpu_key.on_disk_key.k_objectid = ~0U;
169 set_cpu_key_k_offset(&max_cpu_key, ~0U);
170 max_cpu_key.key_length = 3;
171
172 memset(&last_inode_key, 0, sizeof(last_inode_key));
173
174 #ifdef CONFIG_QUOTA
175 /* Needed for iput() to work correctly and not trash data */
176 if (s->s_flags & MS_ACTIVE) {
177 ms_active_set = 0;
178 } else {
179 ms_active_set = 1;
180 s->s_flags |= MS_ACTIVE;
181 }
182 /* Turn on quotas so that they are updated correctly */
183 for (i = 0; i < MAXQUOTAS; i++) {
184 quota_enabled[i] = 1;
185 if (REISERFS_SB(s)->s_qf_names[i]) {
186 int ret;
187
188 if (sb_has_quota_active(s, i)) {
189 quota_enabled[i] = 0;
190 continue;
191 }
192 ret = reiserfs_quota_on_mount(s, i);
193 if (ret < 0)
194 reiserfs_warning(s, "reiserfs-2500",
195 "cannot turn on journaled "
196 "quota: error %d", ret);
197 }
198 }
199 #endif
200
201 done = 0;
202 REISERFS_SB(s)->s_is_unlinked_ok = 1;
203 while (!retval) {
204 retval = search_item(s, &max_cpu_key, &path);
205 if (retval != ITEM_NOT_FOUND) {
206 reiserfs_error(s, "vs-2140",
207 "search_by_key returned %d", retval);
208 break;
209 }
210
211 bh = get_last_bh(&path);
212 item_pos = get_item_pos(&path);
213 if (item_pos != B_NR_ITEMS(bh)) {
214 reiserfs_warning(s, "vs-2060",
215 "wrong position found");
216 break;
217 }
218 item_pos--;
219 ih = B_N_PITEM_HEAD(bh, item_pos);
220
221 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
222 /* there are no "save" links anymore */
223 break;
224
225 save_link_key = ih->ih_key;
226 if (is_indirect_le_ih(ih))
227 truncate = 1;
228 else
229 truncate = 0;
230
231 /* reiserfs_iget needs k_dirid and k_objectid only */
232 item = B_I_PITEM(bh, ih);
233 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
234 obj_key.on_disk_key.k_objectid =
235 le32_to_cpu(ih->ih_key.k_objectid);
236 obj_key.on_disk_key.k_offset = 0;
237 obj_key.on_disk_key.k_type = 0;
238
239 pathrelse(&path);
240
241 inode = reiserfs_iget(s, &obj_key);
242 if (!inode) {
243 /* the unlink almost completed, it just did not manage to remove
244 "save" link and release objectid */
245 reiserfs_warning(s, "vs-2180", "iget failed for %K",
246 &obj_key);
247 retval = remove_save_link_only(s, &save_link_key, 1);
248 continue;
249 }
250
251 if (!truncate && inode->i_nlink) {
252 /* file is not unlinked */
253 reiserfs_warning(s, "vs-2185",
254 "file %K is not unlinked",
255 &obj_key);
256 retval = remove_save_link_only(s, &save_link_key, 0);
257 continue;
258 }
259 dquot_initialize(inode);
260
261 if (truncate && S_ISDIR(inode->i_mode)) {
262 /* We got a truncate request for a dir which is impossible.
263 The only imaginable way is to execute unfinished truncate request
264 then boot into old kernel, remove the file and create dir with
265 the same key. */
266 reiserfs_warning(s, "green-2101",
267 "impossible truncate on a "
268 "directory %k. Please report",
269 INODE_PKEY(inode));
270 retval = remove_save_link_only(s, &save_link_key, 0);
271 truncate = 0;
272 iput(inode);
273 continue;
274 }
275
276 if (truncate) {
277 REISERFS_I(inode)->i_flags |=
278 i_link_saved_truncate_mask;
279 /* not completed truncate found. New size was committed together
280 with "save" link */
281 reiserfs_info(s, "Truncating %k to %Ld ..",
282 INODE_PKEY(inode), inode->i_size);
283 reiserfs_truncate_file(inode,
284 0
285 /*don't update modification time */
286 );
287 retval = remove_save_link(inode, truncate);
288 } else {
289 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
290 /* not completed unlink (rmdir) found */
291 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
292 if (memcmp(&last_inode_key, INODE_PKEY(inode),
293 sizeof(last_inode_key))){
294 last_inode_key = *INODE_PKEY(inode);
295 /* removal gets completed in iput */
296 retval = 0;
297 } else {
298 reiserfs_warning(s, "super-2189", "Dead loop "
299 "in finish_unfinished "
300 "detected, just remove "
301 "save link\n");
302 retval = remove_save_link_only(s,
303 &save_link_key, 0);
304 }
305 }
306
307 iput(inode);
308 printk("done\n");
309 done++;
310 }
311 REISERFS_SB(s)->s_is_unlinked_ok = 0;
312
313 #ifdef CONFIG_QUOTA
314 /* Turn quotas off */
315 for (i = 0; i < MAXQUOTAS; i++) {
316 if (sb_dqopt(s)->files[i] && quota_enabled[i])
317 dquot_quota_off(s, i);
318 }
319 if (ms_active_set)
320 /* Restore the flag back */
321 s->s_flags &= ~MS_ACTIVE;
322 #endif
323 pathrelse(&path);
324 if (done)
325 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
326 "Completed\n", done);
327 return retval;
328 }
329
330 /* to protect file being unlinked from getting lost we "safe" link files
331 being unlinked. This link will be deleted in the same transaction with last
332 item of file. mounting the filesystem we scan all these links and remove
333 files which almost got lost */
334 void add_save_link(struct reiserfs_transaction_handle *th,
335 struct inode *inode, int truncate)
336 {
337 INITIALIZE_PATH(path);
338 int retval;
339 struct cpu_key key;
340 struct item_head ih;
341 __le32 link;
342
343 BUG_ON(!th->t_trans_id);
344
345 /* file can only get one "save link" of each kind */
346 RFALSE(truncate &&
347 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
348 "saved link already exists for truncated inode %lx",
349 (long)inode->i_ino);
350 RFALSE(!truncate &&
351 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
352 "saved link already exists for unlinked inode %lx",
353 (long)inode->i_ino);
354
355 /* setup key of "save" link */
356 key.version = KEY_FORMAT_3_5;
357 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
358 key.on_disk_key.k_objectid = inode->i_ino;
359 if (!truncate) {
360 /* unlink, rmdir, rename */
361 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
362 set_cpu_key_k_type(&key, TYPE_DIRECT);
363
364 /* item head of "safe" link */
365 make_le_item_head(&ih, &key, key.version,
366 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
367 4 /*length */ , 0xffff /*free space */ );
368 } else {
369 /* truncate */
370 if (S_ISDIR(inode->i_mode))
371 reiserfs_warning(inode->i_sb, "green-2102",
372 "Adding a truncate savelink for "
373 "a directory %k! Please report",
374 INODE_PKEY(inode));
375 set_cpu_key_k_offset(&key, 1);
376 set_cpu_key_k_type(&key, TYPE_INDIRECT);
377
378 /* item head of "safe" link */
379 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
380 4 /*length */ , 0 /*free space */ );
381 }
382 key.key_length = 3;
383
384 /* look for its place in the tree */
385 retval = search_item(inode->i_sb, &key, &path);
386 if (retval != ITEM_NOT_FOUND) {
387 if (retval != -ENOSPC)
388 reiserfs_error(inode->i_sb, "vs-2100",
389 "search_by_key (%K) returned %d", &key,
390 retval);
391 pathrelse(&path);
392 return;
393 }
394
395 /* body of "save" link */
396 link = INODE_PKEY(inode)->k_dir_id;
397
398 /* put "save" link into tree, don't charge quota to anyone */
399 retval =
400 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
401 if (retval) {
402 if (retval != -ENOSPC)
403 reiserfs_error(inode->i_sb, "vs-2120",
404 "insert_item returned %d", retval);
405 } else {
406 if (truncate)
407 REISERFS_I(inode)->i_flags |=
408 i_link_saved_truncate_mask;
409 else
410 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
411 }
412 }
413
414 /* this opens transaction unlike add_save_link */
415 int remove_save_link(struct inode *inode, int truncate)
416 {
417 struct reiserfs_transaction_handle th;
418 struct reiserfs_key key;
419 int err;
420
421 /* we are going to do one balancing only */
422 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
423 if (err)
424 return err;
425
426 /* setup key of "save" link */
427 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
428 key.k_objectid = INODE_PKEY(inode)->k_objectid;
429 if (!truncate) {
430 /* unlink, rmdir, rename */
431 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
432 1 + inode->i_sb->s_blocksize);
433 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
434 } else {
435 /* truncate */
436 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
437 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
438 }
439
440 if ((truncate &&
441 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
442 (!truncate &&
443 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
444 /* don't take quota bytes from anywhere */
445 reiserfs_delete_solid_item(&th, NULL, &key);
446 if (!truncate) {
447 reiserfs_release_objectid(&th, inode->i_ino);
448 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
449 } else
450 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
451
452 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
453 }
454
455 static void reiserfs_kill_sb(struct super_block *s)
456 {
457 if (REISERFS_SB(s)) {
458 /*
459 * Force any pending inode evictions to occur now. Any
460 * inodes to be removed that have extended attributes
461 * associated with them need to clean them up before
462 * we can release the extended attribute root dentries.
463 * shrink_dcache_for_umount will BUG if we don't release
464 * those before it's called so ->put_super is too late.
465 */
466 shrink_dcache_sb(s);
467
468 dput(REISERFS_SB(s)->xattr_root);
469 REISERFS_SB(s)->xattr_root = NULL;
470 dput(REISERFS_SB(s)->priv_root);
471 REISERFS_SB(s)->priv_root = NULL;
472 }
473
474 kill_block_super(s);
475 }
476
477 static void reiserfs_put_super(struct super_block *s)
478 {
479 struct reiserfs_transaction_handle th;
480 th.t_trans_id = 0;
481
482 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
483
484 reiserfs_write_lock(s);
485
486 if (s->s_dirt)
487 reiserfs_write_super(s);
488
489 /* change file system state to current state if it was mounted with read-write permissions */
490 if (!(s->s_flags & MS_RDONLY)) {
491 if (!journal_begin(&th, s, 10)) {
492 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
493 1);
494 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
495 REISERFS_SB(s)->s_mount_state);
496 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
497 }
498 }
499
500 /* note, journal_release checks for readonly mount, and can decide not
501 ** to do a journal_end
502 */
503 journal_release(&th, s);
504
505 reiserfs_free_bitmap_cache(s);
506
507 brelse(SB_BUFFER_WITH_SB(s));
508
509 print_statistics(s);
510
511 if (REISERFS_SB(s)->reserved_blocks != 0) {
512 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
513 REISERFS_SB(s)->reserved_blocks);
514 }
515
516 reiserfs_proc_info_done(s);
517
518 reiserfs_write_unlock(s);
519 mutex_destroy(&REISERFS_SB(s)->lock);
520 kfree(s->s_fs_info);
521 s->s_fs_info = NULL;
522 }
523
524 static struct kmem_cache *reiserfs_inode_cachep;
525
526 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
527 {
528 struct reiserfs_inode_info *ei;
529 ei = (struct reiserfs_inode_info *)
530 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
531 if (!ei)
532 return NULL;
533 atomic_set(&ei->openers, 0);
534 mutex_init(&ei->tailpack);
535 return &ei->vfs_inode;
536 }
537
538 static void reiserfs_i_callback(struct rcu_head *head)
539 {
540 struct inode *inode = container_of(head, struct inode, i_rcu);
541 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
542 }
543
544 static void reiserfs_destroy_inode(struct inode *inode)
545 {
546 call_rcu(&inode->i_rcu, reiserfs_i_callback);
547 }
548
549 static void init_once(void *foo)
550 {
551 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
552
553 INIT_LIST_HEAD(&ei->i_prealloc_list);
554 inode_init_once(&ei->vfs_inode);
555 }
556
557 static int init_inodecache(void)
558 {
559 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
560 sizeof(struct
561 reiserfs_inode_info),
562 0, (SLAB_RECLAIM_ACCOUNT|
563 SLAB_MEM_SPREAD),
564 init_once);
565 if (reiserfs_inode_cachep == NULL)
566 return -ENOMEM;
567 return 0;
568 }
569
570 static void destroy_inodecache(void)
571 {
572 kmem_cache_destroy(reiserfs_inode_cachep);
573 }
574
575 /* we don't mark inodes dirty, we just log them */
576 static void reiserfs_dirty_inode(struct inode *inode, int flags)
577 {
578 struct reiserfs_transaction_handle th;
579
580 int err = 0;
581 int lock_depth;
582
583 if (inode->i_sb->s_flags & MS_RDONLY) {
584 reiserfs_warning(inode->i_sb, "clm-6006",
585 "writing inode %lu on readonly FS",
586 inode->i_ino);
587 return;
588 }
589 lock_depth = reiserfs_write_lock_once(inode->i_sb);
590
591 /* this is really only used for atime updates, so they don't have
592 ** to be included in O_SYNC or fsync
593 */
594 err = journal_begin(&th, inode->i_sb, 1);
595 if (err)
596 goto out;
597
598 reiserfs_update_sd(&th, inode);
599 journal_end(&th, inode->i_sb, 1);
600
601 out:
602 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
603 }
604
605 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
606 {
607 struct super_block *s = root->d_sb;
608 struct reiserfs_journal *journal = SB_JOURNAL(s);
609 long opts = REISERFS_SB(s)->s_mount_opt;
610
611 if (opts & (1 << REISERFS_LARGETAIL))
612 seq_puts(seq, ",tails=on");
613 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
614 seq_puts(seq, ",notail");
615 /* tails=small is default so we don't show it */
616
617 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
618 seq_puts(seq, ",barrier=none");
619 /* barrier=flush is default so we don't show it */
620
621 if (opts & (1 << REISERFS_ERROR_CONTINUE))
622 seq_puts(seq, ",errors=continue");
623 else if (opts & (1 << REISERFS_ERROR_PANIC))
624 seq_puts(seq, ",errors=panic");
625 /* errors=ro is default so we don't show it */
626
627 if (opts & (1 << REISERFS_DATA_LOG))
628 seq_puts(seq, ",data=journal");
629 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
630 seq_puts(seq, ",data=writeback");
631 /* data=ordered is default so we don't show it */
632
633 if (opts & (1 << REISERFS_ATTRS))
634 seq_puts(seq, ",attrs");
635
636 if (opts & (1 << REISERFS_XATTRS_USER))
637 seq_puts(seq, ",user_xattr");
638
639 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
640 seq_puts(seq, ",expose_privroot");
641
642 if (opts & (1 << REISERFS_POSIXACL))
643 seq_puts(seq, ",acl");
644
645 if (REISERFS_SB(s)->s_jdev)
646 seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
647
648 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
649 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
650
651 #ifdef CONFIG_QUOTA
652 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
653 seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
654 else if (opts & (1 << REISERFS_USRQUOTA))
655 seq_puts(seq, ",usrquota");
656 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
657 seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
658 else if (opts & (1 << REISERFS_GRPQUOTA))
659 seq_puts(seq, ",grpquota");
660 if (REISERFS_SB(s)->s_jquota_fmt) {
661 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
662 seq_puts(seq, ",jqfmt=vfsold");
663 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
664 seq_puts(seq, ",jqfmt=vfsv0");
665 }
666 #endif
667
668 /* Block allocator options */
669 if (opts & (1 << REISERFS_NO_BORDER))
670 seq_puts(seq, ",block-allocator=noborder");
671 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
672 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
673 if (opts & (1 << REISERFS_HASHED_RELOCATION))
674 seq_puts(seq, ",block-allocator=hashed_relocation");
675 if (opts & (1 << REISERFS_TEST4))
676 seq_puts(seq, ",block-allocator=test4");
677 show_alloc_options(seq, s);
678 return 0;
679 }
680
681 #ifdef CONFIG_QUOTA
682 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
683 size_t, loff_t);
684 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
685 loff_t);
686 #endif
687
688 static const struct super_operations reiserfs_sops = {
689 .alloc_inode = reiserfs_alloc_inode,
690 .destroy_inode = reiserfs_destroy_inode,
691 .write_inode = reiserfs_write_inode,
692 .dirty_inode = reiserfs_dirty_inode,
693 .evict_inode = reiserfs_evict_inode,
694 .put_super = reiserfs_put_super,
695 .write_super = reiserfs_write_super,
696 .sync_fs = reiserfs_sync_fs,
697 .freeze_fs = reiserfs_freeze,
698 .unfreeze_fs = reiserfs_unfreeze,
699 .statfs = reiserfs_statfs,
700 .remount_fs = reiserfs_remount,
701 .show_options = reiserfs_show_options,
702 #ifdef CONFIG_QUOTA
703 .quota_read = reiserfs_quota_read,
704 .quota_write = reiserfs_quota_write,
705 #endif
706 };
707
708 #ifdef CONFIG_QUOTA
709 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
710
711 static int reiserfs_write_dquot(struct dquot *);
712 static int reiserfs_acquire_dquot(struct dquot *);
713 static int reiserfs_release_dquot(struct dquot *);
714 static int reiserfs_mark_dquot_dirty(struct dquot *);
715 static int reiserfs_write_info(struct super_block *, int);
716 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
717
718 static const struct dquot_operations reiserfs_quota_operations = {
719 .write_dquot = reiserfs_write_dquot,
720 .acquire_dquot = reiserfs_acquire_dquot,
721 .release_dquot = reiserfs_release_dquot,
722 .mark_dirty = reiserfs_mark_dquot_dirty,
723 .write_info = reiserfs_write_info,
724 .alloc_dquot = dquot_alloc,
725 .destroy_dquot = dquot_destroy,
726 };
727
728 static const struct quotactl_ops reiserfs_qctl_operations = {
729 .quota_on = reiserfs_quota_on,
730 .quota_off = dquot_quota_off,
731 .quota_sync = dquot_quota_sync,
732 .get_info = dquot_get_dqinfo,
733 .set_info = dquot_set_dqinfo,
734 .get_dqblk = dquot_get_dqblk,
735 .set_dqblk = dquot_set_dqblk,
736 };
737 #endif
738
739 static const struct export_operations reiserfs_export_ops = {
740 .encode_fh = reiserfs_encode_fh,
741 .fh_to_dentry = reiserfs_fh_to_dentry,
742 .fh_to_parent = reiserfs_fh_to_parent,
743 .get_parent = reiserfs_get_parent,
744 };
745
746 /* this struct is used in reiserfs_getopt () for containing the value for those
747 mount options that have values rather than being toggles. */
748 typedef struct {
749 char *value;
750 int setmask; /* bitmask which is to set on mount_options bitmask when this
751 value is found, 0 is no bits are to be changed. */
752 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
753 value is found, 0 is no bits are to be changed. This is
754 applied BEFORE setmask */
755 } arg_desc_t;
756
757 /* Set this bit in arg_required to allow empty arguments */
758 #define REISERFS_OPT_ALLOWEMPTY 31
759
760 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
761 mount options */
762 typedef struct {
763 char *option_name;
764 int arg_required; /* 0 if argument is not required, not 0 otherwise */
765 const arg_desc_t *values; /* list of values accepted by an option */
766 int setmask; /* bitmask which is to set on mount_options bitmask when this
767 value is found, 0 is no bits are to be changed. */
768 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
769 value is found, 0 is no bits are to be changed. This is
770 applied BEFORE setmask */
771 } opt_desc_t;
772
773 /* possible values for -o data= */
774 static const arg_desc_t logging_mode[] = {
775 {"ordered", 1 << REISERFS_DATA_ORDERED,
776 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
777 {"journal", 1 << REISERFS_DATA_LOG,
778 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
779 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
780 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
781 {.value = NULL}
782 };
783
784 /* possible values for -o barrier= */
785 static const arg_desc_t barrier_mode[] = {
786 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
787 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
788 {.value = NULL}
789 };
790
791 /* possible values for "-o block-allocator=" and bits which are to be set in
792 s_mount_opt of reiserfs specific part of in-core super block */
793 static const arg_desc_t balloc[] = {
794 {"noborder", 1 << REISERFS_NO_BORDER, 0},
795 {"border", 0, 1 << REISERFS_NO_BORDER},
796 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
797 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
798 {"test4", 1 << REISERFS_TEST4, 0},
799 {"notest4", 0, 1 << REISERFS_TEST4},
800 {NULL, 0, 0}
801 };
802
803 static const arg_desc_t tails[] = {
804 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
805 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
806 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
807 {NULL, 0, 0}
808 };
809
810 static const arg_desc_t error_actions[] = {
811 {"panic", 1 << REISERFS_ERROR_PANIC,
812 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
813 {"ro-remount", 1 << REISERFS_ERROR_RO,
814 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
815 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
816 {"continue", 1 << REISERFS_ERROR_CONTINUE,
817 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
818 #endif
819 {NULL, 0, 0},
820 };
821
822 /* proceed only one option from a list *cur - string containing of mount options
823 opts - array of options which are accepted
824 opt_arg - if option is found and requires an argument and if it is specifed
825 in the input - pointer to the argument is stored here
826 bit_flags - if option requires to set a certain bit - it is set here
827 return -1 if unknown option is found, opt->arg_required otherwise */
828 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
829 char **opt_arg, unsigned long *bit_flags)
830 {
831 char *p;
832 /* foo=bar,
833 ^ ^ ^
834 | | +-- option_end
835 | +-- arg_start
836 +-- option_start
837 */
838 const opt_desc_t *opt;
839 const arg_desc_t *arg;
840
841 p = *cur;
842
843 /* assume argument cannot contain commas */
844 *cur = strchr(p, ',');
845 if (*cur) {
846 *(*cur) = '\0';
847 (*cur)++;
848 }
849
850 if (!strncmp(p, "alloc=", 6)) {
851 /* Ugly special case, probably we should redo options parser so that
852 it can understand several arguments for some options, also so that
853 it can fill several bitfields with option values. */
854 if (reiserfs_parse_alloc_options(s, p + 6)) {
855 return -1;
856 } else {
857 return 0;
858 }
859 }
860
861 /* for every option in the list */
862 for (opt = opts; opt->option_name; opt++) {
863 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
864 if (bit_flags) {
865 if (opt->clrmask ==
866 (1 << REISERFS_UNSUPPORTED_OPT))
867 reiserfs_warning(s, "super-6500",
868 "%s not supported.\n",
869 p);
870 else
871 *bit_flags &= ~opt->clrmask;
872 if (opt->setmask ==
873 (1 << REISERFS_UNSUPPORTED_OPT))
874 reiserfs_warning(s, "super-6501",
875 "%s not supported.\n",
876 p);
877 else
878 *bit_flags |= opt->setmask;
879 }
880 break;
881 }
882 }
883 if (!opt->option_name) {
884 reiserfs_warning(s, "super-6502",
885 "unknown mount option \"%s\"", p);
886 return -1;
887 }
888
889 p += strlen(opt->option_name);
890 switch (*p) {
891 case '=':
892 if (!opt->arg_required) {
893 reiserfs_warning(s, "super-6503",
894 "the option \"%s\" does not "
895 "require an argument\n",
896 opt->option_name);
897 return -1;
898 }
899 break;
900
901 case 0:
902 if (opt->arg_required) {
903 reiserfs_warning(s, "super-6504",
904 "the option \"%s\" requires an "
905 "argument\n", opt->option_name);
906 return -1;
907 }
908 break;
909 default:
910 reiserfs_warning(s, "super-6505",
911 "head of option \"%s\" is only correct\n",
912 opt->option_name);
913 return -1;
914 }
915
916 /* move to the argument, or to next option if argument is not required */
917 p++;
918
919 if (opt->arg_required
920 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
921 && !strlen(p)) {
922 /* this catches "option=," if not allowed */
923 reiserfs_warning(s, "super-6506",
924 "empty argument for \"%s\"\n",
925 opt->option_name);
926 return -1;
927 }
928
929 if (!opt->values) {
930 /* *=NULLopt_arg contains pointer to argument */
931 *opt_arg = p;
932 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
933 }
934
935 /* values possible for this option are listed in opt->values */
936 for (arg = opt->values; arg->value; arg++) {
937 if (!strcmp(p, arg->value)) {
938 if (bit_flags) {
939 *bit_flags &= ~arg->clrmask;
940 *bit_flags |= arg->setmask;
941 }
942 return opt->arg_required;
943 }
944 }
945
946 reiserfs_warning(s, "super-6506",
947 "bad value \"%s\" for option \"%s\"\n", p,
948 opt->option_name);
949 return -1;
950 }
951
952 /* returns 0 if something is wrong in option string, 1 - otherwise */
953 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
954 unsigned long *mount_options,
955 /* after the parsing phase, contains the
956 collection of bitflags defining what
957 mount options were selected. */
958 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
959 char **jdev_name,
960 unsigned int *commit_max_age,
961 char **qf_names,
962 unsigned int *qfmt)
963 {
964 int c;
965 char *arg = NULL;
966 char *pos;
967 opt_desc_t opts[] = {
968 /* Compatibility stuff, so that -o notail for old setups still work */
969 {"tails",.arg_required = 't',.values = tails},
970 {"notail",.clrmask =
971 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
972 {"conv",.setmask = 1 << REISERFS_CONVERT},
973 {"attrs",.setmask = 1 << REISERFS_ATTRS},
974 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
975 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
976 #ifdef CONFIG_REISERFS_FS_XATTR
977 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
978 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
979 #else
980 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
981 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
982 #endif
983 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
984 {"acl",.setmask = 1 << REISERFS_POSIXACL},
985 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
986 #else
987 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
988 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
989 #endif
990 {.option_name = "nolog"},
991 {"replayonly",.setmask = 1 << REPLAYONLY},
992 {"block-allocator",.arg_required = 'a',.values = balloc},
993 {"data",.arg_required = 'd',.values = logging_mode},
994 {"barrier",.arg_required = 'b',.values = barrier_mode},
995 {"resize",.arg_required = 'r',.values = NULL},
996 {"jdev",.arg_required = 'j',.values = NULL},
997 {"nolargeio",.arg_required = 'w',.values = NULL},
998 {"commit",.arg_required = 'c',.values = NULL},
999 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1000 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1001 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1002 {"errors",.arg_required = 'e',.values = error_actions},
1003 {"usrjquota",.arg_required =
1004 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1005 {"grpjquota",.arg_required =
1006 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1007 {"jqfmt",.arg_required = 'f',.values = NULL},
1008 {.option_name = NULL}
1009 };
1010
1011 *blocks = 0;
1012 if (!options || !*options)
1013 /* use default configuration: create tails, journaling on, no
1014 conversion to newest format */
1015 return 1;
1016
1017 for (pos = options; pos;) {
1018 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1019 if (c == -1)
1020 /* wrong option is given */
1021 return 0;
1022
1023 if (c == 'r') {
1024 char *p;
1025
1026 p = NULL;
1027 /* "resize=NNN" or "resize=auto" */
1028
1029 if (!strcmp(arg, "auto")) {
1030 /* From JFS code, to auto-get the size. */
1031 *blocks =
1032 s->s_bdev->bd_inode->i_size >> s->
1033 s_blocksize_bits;
1034 } else {
1035 *blocks = simple_strtoul(arg, &p, 0);
1036 if (*p != '\0') {
1037 /* NNN does not look like a number */
1038 reiserfs_warning(s, "super-6507",
1039 "bad value %s for "
1040 "-oresize\n", arg);
1041 return 0;
1042 }
1043 }
1044 }
1045
1046 if (c == 'c') {
1047 char *p = NULL;
1048 unsigned long val = simple_strtoul(arg, &p, 0);
1049 /* commit=NNN (time in seconds) */
1050 if (*p != '\0' || val >= (unsigned int)-1) {
1051 reiserfs_warning(s, "super-6508",
1052 "bad value %s for -ocommit\n",
1053 arg);
1054 return 0;
1055 }
1056 *commit_max_age = (unsigned int)val;
1057 }
1058
1059 if (c == 'w') {
1060 reiserfs_warning(s, "super-6509", "nolargeio option "
1061 "is no longer supported");
1062 return 0;
1063 }
1064
1065 if (c == 'j') {
1066 if (arg && *arg && jdev_name) {
1067 if (*jdev_name) { //Hm, already assigned?
1068 reiserfs_warning(s, "super-6510",
1069 "journal device was "
1070 "already specified to "
1071 "be %s", *jdev_name);
1072 return 0;
1073 }
1074 *jdev_name = arg;
1075 }
1076 }
1077 #ifdef CONFIG_QUOTA
1078 if (c == 'u' || c == 'g') {
1079 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1080
1081 if (sb_any_quota_loaded(s) &&
1082 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1083 reiserfs_warning(s, "super-6511",
1084 "cannot change journaled "
1085 "quota options when quota "
1086 "turned on.");
1087 return 0;
1088 }
1089 if (*arg) { /* Some filename specified? */
1090 if (REISERFS_SB(s)->s_qf_names[qtype]
1091 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1092 arg)) {
1093 reiserfs_warning(s, "super-6512",
1094 "%s quota file "
1095 "already specified.",
1096 QTYPE2NAME(qtype));
1097 return 0;
1098 }
1099 if (strchr(arg, '/')) {
1100 reiserfs_warning(s, "super-6513",
1101 "quotafile must be "
1102 "on filesystem root.");
1103 return 0;
1104 }
1105 qf_names[qtype] =
1106 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1107 if (!qf_names[qtype]) {
1108 reiserfs_warning(s, "reiserfs-2502",
1109 "not enough memory "
1110 "for storing "
1111 "quotafile name.");
1112 return 0;
1113 }
1114 strcpy(qf_names[qtype], arg);
1115 if (qtype == USRQUOTA)
1116 *mount_options |= 1 << REISERFS_USRQUOTA;
1117 else
1118 *mount_options |= 1 << REISERFS_GRPQUOTA;
1119 } else {
1120 if (qf_names[qtype] !=
1121 REISERFS_SB(s)->s_qf_names[qtype])
1122 kfree(qf_names[qtype]);
1123 qf_names[qtype] = NULL;
1124 if (qtype == USRQUOTA)
1125 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1126 else
1127 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1128 }
1129 }
1130 if (c == 'f') {
1131 if (!strcmp(arg, "vfsold"))
1132 *qfmt = QFMT_VFS_OLD;
1133 else if (!strcmp(arg, "vfsv0"))
1134 *qfmt = QFMT_VFS_V0;
1135 else {
1136 reiserfs_warning(s, "super-6514",
1137 "unknown quota format "
1138 "specified.");
1139 return 0;
1140 }
1141 if (sb_any_quota_loaded(s) &&
1142 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1143 reiserfs_warning(s, "super-6515",
1144 "cannot change journaled "
1145 "quota options when quota "
1146 "turned on.");
1147 return 0;
1148 }
1149 }
1150 #else
1151 if (c == 'u' || c == 'g' || c == 'f') {
1152 reiserfs_warning(s, "reiserfs-2503", "journaled "
1153 "quota options not supported.");
1154 return 0;
1155 }
1156 #endif
1157 }
1158
1159 #ifdef CONFIG_QUOTA
1160 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1161 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1162 reiserfs_warning(s, "super-6515",
1163 "journaled quota format not specified.");
1164 return 0;
1165 }
1166 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1167 sb_has_quota_loaded(s, USRQUOTA)) ||
1168 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1169 sb_has_quota_loaded(s, GRPQUOTA))) {
1170 reiserfs_warning(s, "super-6516", "quota options must "
1171 "be present when quota is turned on.");
1172 return 0;
1173 }
1174 #endif
1175
1176 return 1;
1177 }
1178
1179 static void switch_data_mode(struct super_block *s, unsigned long mode)
1180 {
1181 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1182 (1 << REISERFS_DATA_ORDERED) |
1183 (1 << REISERFS_DATA_WRITEBACK));
1184 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1185 }
1186
1187 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1188 {
1189 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1190 if (!reiserfs_data_log(s)) {
1191 switch_data_mode(s, REISERFS_DATA_LOG);
1192 reiserfs_info(s, "switching to journaled data mode\n");
1193 }
1194 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1195 if (!reiserfs_data_ordered(s)) {
1196 switch_data_mode(s, REISERFS_DATA_ORDERED);
1197 reiserfs_info(s, "switching to ordered data mode\n");
1198 }
1199 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1200 if (!reiserfs_data_writeback(s)) {
1201 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1202 reiserfs_info(s, "switching to writeback data mode\n");
1203 }
1204 }
1205 }
1206
1207 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1208 {
1209 int flush = (1 << REISERFS_BARRIER_FLUSH);
1210 int none = (1 << REISERFS_BARRIER_NONE);
1211 int all_barrier = flush | none;
1212
1213 if (bits & all_barrier) {
1214 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1215 if (bits & flush) {
1216 REISERFS_SB(s)->s_mount_opt |= flush;
1217 printk("reiserfs: enabling write barrier flush mode\n");
1218 } else if (bits & none) {
1219 REISERFS_SB(s)->s_mount_opt |= none;
1220 printk("reiserfs: write barriers turned off\n");
1221 }
1222 }
1223 }
1224
1225 static void handle_attrs(struct super_block *s)
1226 {
1227 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1228
1229 if (reiserfs_attrs(s)) {
1230 if (old_format_only(s)) {
1231 reiserfs_warning(s, "super-6517", "cannot support "
1232 "attributes on 3.5.x disk format");
1233 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1234 return;
1235 }
1236 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1237 reiserfs_warning(s, "super-6518", "cannot support "
1238 "attributes until flag is set in "
1239 "super-block");
1240 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1241 }
1242 }
1243 }
1244
1245 #ifdef CONFIG_QUOTA
1246 static void handle_quota_files(struct super_block *s, char **qf_names,
1247 unsigned int *qfmt)
1248 {
1249 int i;
1250
1251 for (i = 0; i < MAXQUOTAS; i++) {
1252 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1253 kfree(REISERFS_SB(s)->s_qf_names[i]);
1254 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1255 }
1256 if (*qfmt)
1257 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1258 }
1259 #endif
1260
1261 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1262 {
1263 struct reiserfs_super_block *rs;
1264 struct reiserfs_transaction_handle th;
1265 unsigned long blocks;
1266 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1267 unsigned long safe_mask = 0;
1268 unsigned int commit_max_age = (unsigned int)-1;
1269 struct reiserfs_journal *journal = SB_JOURNAL(s);
1270 char *new_opts = kstrdup(arg, GFP_KERNEL);
1271 int err;
1272 char *qf_names[MAXQUOTAS];
1273 unsigned int qfmt = 0;
1274 #ifdef CONFIG_QUOTA
1275 int i;
1276 #endif
1277
1278 reiserfs_write_lock(s);
1279
1280 #ifdef CONFIG_QUOTA
1281 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1282 #endif
1283
1284 rs = SB_DISK_SUPER_BLOCK(s);
1285
1286 if (!reiserfs_parse_options
1287 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1288 qf_names, &qfmt)) {
1289 #ifdef CONFIG_QUOTA
1290 for (i = 0; i < MAXQUOTAS; i++)
1291 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1292 kfree(qf_names[i]);
1293 #endif
1294 err = -EINVAL;
1295 goto out_err;
1296 }
1297 #ifdef CONFIG_QUOTA
1298 handle_quota_files(s, qf_names, &qfmt);
1299 #endif
1300
1301 handle_attrs(s);
1302
1303 /* Add options that are safe here */
1304 safe_mask |= 1 << REISERFS_SMALLTAIL;
1305 safe_mask |= 1 << REISERFS_LARGETAIL;
1306 safe_mask |= 1 << REISERFS_NO_BORDER;
1307 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1308 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1309 safe_mask |= 1 << REISERFS_TEST4;
1310 safe_mask |= 1 << REISERFS_ATTRS;
1311 safe_mask |= 1 << REISERFS_XATTRS_USER;
1312 safe_mask |= 1 << REISERFS_POSIXACL;
1313 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1314 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1315 safe_mask |= 1 << REISERFS_ERROR_RO;
1316 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1317 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1318 safe_mask |= 1 << REISERFS_USRQUOTA;
1319 safe_mask |= 1 << REISERFS_GRPQUOTA;
1320
1321 /* Update the bitmask, taking care to keep
1322 * the bits we're not allowed to change here */
1323 REISERFS_SB(s)->s_mount_opt =
1324 (REISERFS_SB(s)->
1325 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1326
1327 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1328 journal->j_max_commit_age = commit_max_age;
1329 journal->j_max_trans_age = commit_max_age;
1330 } else if (commit_max_age == 0) {
1331 /* 0 means restore defaults. */
1332 journal->j_max_commit_age = journal->j_default_max_commit_age;
1333 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1334 }
1335
1336 if (blocks) {
1337 err = reiserfs_resize(s, blocks);
1338 if (err != 0)
1339 goto out_err;
1340 }
1341
1342 if (*mount_flags & MS_RDONLY) {
1343 reiserfs_xattr_init(s, *mount_flags);
1344 /* remount read-only */
1345 if (s->s_flags & MS_RDONLY)
1346 /* it is read-only already */
1347 goto out_ok;
1348
1349 err = dquot_suspend(s, -1);
1350 if (err < 0)
1351 goto out_err;
1352
1353 /* try to remount file system with read-only permissions */
1354 if (sb_umount_state(rs) == REISERFS_VALID_FS
1355 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1356 goto out_ok;
1357 }
1358
1359 err = journal_begin(&th, s, 10);
1360 if (err)
1361 goto out_err;
1362
1363 /* Mounting a rw partition read-only. */
1364 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1365 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1366 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1367 } else {
1368 /* remount read-write */
1369 if (!(s->s_flags & MS_RDONLY)) {
1370 reiserfs_xattr_init(s, *mount_flags);
1371 goto out_ok; /* We are read-write already */
1372 }
1373
1374 if (reiserfs_is_journal_aborted(journal)) {
1375 err = journal->j_errno;
1376 goto out_err;
1377 }
1378
1379 handle_data_mode(s, mount_options);
1380 handle_barrier_mode(s, mount_options);
1381 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1382 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1383 err = journal_begin(&th, s, 10);
1384 if (err)
1385 goto out_err;
1386
1387 /* Mount a partition which is read-only, read-write */
1388 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1389 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1390 s->s_flags &= ~MS_RDONLY;
1391 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1392 if (!old_format_only(s))
1393 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1394 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1395 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1396 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1397 }
1398 /* this will force a full flush of all journal lists */
1399 SB_JOURNAL(s)->j_must_wait = 1;
1400 err = journal_end(&th, s, 10);
1401 if (err)
1402 goto out_err;
1403 s->s_dirt = 0;
1404
1405 if (!(*mount_flags & MS_RDONLY)) {
1406 dquot_resume(s, -1);
1407 finish_unfinished(s);
1408 reiserfs_xattr_init(s, *mount_flags);
1409 }
1410
1411 out_ok:
1412 replace_mount_options(s, new_opts);
1413 reiserfs_write_unlock(s);
1414 return 0;
1415
1416 out_err:
1417 kfree(new_opts);
1418 reiserfs_write_unlock(s);
1419 return err;
1420 }
1421
1422 static int read_super_block(struct super_block *s, int offset)
1423 {
1424 struct buffer_head *bh;
1425 struct reiserfs_super_block *rs;
1426 int fs_blocksize;
1427
1428 bh = sb_bread(s, offset / s->s_blocksize);
1429 if (!bh) {
1430 reiserfs_warning(s, "sh-2006",
1431 "bread failed (dev %s, block %lu, size %lu)",
1432 reiserfs_bdevname(s), offset / s->s_blocksize,
1433 s->s_blocksize);
1434 return 1;
1435 }
1436
1437 rs = (struct reiserfs_super_block *)bh->b_data;
1438 if (!is_any_reiserfs_magic_string(rs)) {
1439 brelse(bh);
1440 return 1;
1441 }
1442 //
1443 // ok, reiserfs signature (old or new) found in at the given offset
1444 //
1445 fs_blocksize = sb_blocksize(rs);
1446 brelse(bh);
1447 sb_set_blocksize(s, fs_blocksize);
1448
1449 bh = sb_bread(s, offset / s->s_blocksize);
1450 if (!bh) {
1451 reiserfs_warning(s, "sh-2007",
1452 "bread failed (dev %s, block %lu, size %lu)",
1453 reiserfs_bdevname(s), offset / s->s_blocksize,
1454 s->s_blocksize);
1455 return 1;
1456 }
1457
1458 rs = (struct reiserfs_super_block *)bh->b_data;
1459 if (sb_blocksize(rs) != s->s_blocksize) {
1460 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1461 "filesystem on (dev %s, block %Lu, size %lu)",
1462 reiserfs_bdevname(s),
1463 (unsigned long long)bh->b_blocknr,
1464 s->s_blocksize);
1465 brelse(bh);
1466 return 1;
1467 }
1468
1469 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1470 brelse(bh);
1471 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1472 "--rebuild-tree run detected. Please run\n"
1473 "reiserfsck --rebuild-tree and wait for a "
1474 "completion. If that fails\n"
1475 "get newer reiserfsprogs package");
1476 return 1;
1477 }
1478
1479 SB_BUFFER_WITH_SB(s) = bh;
1480 SB_DISK_SUPER_BLOCK(s) = rs;
1481
1482 if (is_reiserfs_jr(rs)) {
1483 /* magic is of non-standard journal filesystem, look at s_version to
1484 find which format is in use */
1485 if (sb_version(rs) == REISERFS_VERSION_2)
1486 reiserfs_info(s, "found reiserfs format \"3.6\""
1487 " with non-standard journal\n");
1488 else if (sb_version(rs) == REISERFS_VERSION_1)
1489 reiserfs_info(s, "found reiserfs format \"3.5\""
1490 " with non-standard journal\n");
1491 else {
1492 reiserfs_warning(s, "sh-2012", "found unknown "
1493 "format \"%u\" of reiserfs with "
1494 "non-standard magic", sb_version(rs));
1495 return 1;
1496 }
1497 } else
1498 /* s_version of standard format may contain incorrect information,
1499 so we just look at the magic string */
1500 reiserfs_info(s,
1501 "found reiserfs format \"%s\" with standard journal\n",
1502 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1503
1504 s->s_op = &reiserfs_sops;
1505 s->s_export_op = &reiserfs_export_ops;
1506 #ifdef CONFIG_QUOTA
1507 s->s_qcop = &reiserfs_qctl_operations;
1508 s->dq_op = &reiserfs_quota_operations;
1509 #endif
1510
1511 /* new format is limited by the 32 bit wide i_blocks field, want to
1512 ** be one full block below that.
1513 */
1514 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1515 return 0;
1516 }
1517
1518 /* after journal replay, reread all bitmap and super blocks */
1519 static int reread_meta_blocks(struct super_block *s)
1520 {
1521 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1522 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1523 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1524 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1525 return 1;
1526 }
1527
1528 return 0;
1529 }
1530
1531 /////////////////////////////////////////////////////
1532 // hash detection stuff
1533
1534 // if root directory is empty - we set default - Yura's - hash and
1535 // warn about it
1536 // FIXME: we look for only one name in a directory. If tea and yura
1537 // bith have the same value - we ask user to send report to the
1538 // mailing list
1539 static __u32 find_hash_out(struct super_block *s)
1540 {
1541 int retval;
1542 struct inode *inode;
1543 struct cpu_key key;
1544 INITIALIZE_PATH(path);
1545 struct reiserfs_dir_entry de;
1546 __u32 hash = DEFAULT_HASH;
1547
1548 inode = s->s_root->d_inode;
1549
1550 do { // Some serious "goto"-hater was there ;)
1551 u32 teahash, r5hash, yurahash;
1552
1553 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1554 retval = search_by_entry_key(s, &key, &path, &de);
1555 if (retval == IO_ERROR) {
1556 pathrelse(&path);
1557 return UNSET_HASH;
1558 }
1559 if (retval == NAME_NOT_FOUND)
1560 de.de_entry_num--;
1561 set_de_name_and_namelen(&de);
1562 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1563 /* allow override in this case */
1564 if (reiserfs_rupasov_hash(s)) {
1565 hash = YURA_HASH;
1566 }
1567 reiserfs_info(s, "FS seems to be empty, autodetect "
1568 "is using the default hash\n");
1569 break;
1570 }
1571 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1572 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1573 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1574 if (((teahash == r5hash)
1575 &&
1576 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1577 == r5hash)) || ((teahash == yurahash)
1578 && (yurahash ==
1579 GET_HASH_VALUE(deh_offset
1580 (&
1581 (de.
1582 de_deh[de.
1583 de_entry_num])))))
1584 || ((r5hash == yurahash)
1585 && (yurahash ==
1586 GET_HASH_VALUE(deh_offset
1587 (&(de.de_deh[de.de_entry_num])))))) {
1588 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1589 "automatically detect hash function. "
1590 "Please mount with -o "
1591 "hash={tea,rupasov,r5}");
1592 hash = UNSET_HASH;
1593 break;
1594 }
1595 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1596 yurahash)
1597 hash = YURA_HASH;
1598 else if (GET_HASH_VALUE
1599 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1600 hash = TEA_HASH;
1601 else if (GET_HASH_VALUE
1602 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1603 hash = R5_HASH;
1604 else {
1605 reiserfs_warning(s, "reiserfs-2506",
1606 "Unrecognised hash function");
1607 hash = UNSET_HASH;
1608 }
1609 } while (0);
1610
1611 pathrelse(&path);
1612 return hash;
1613 }
1614
1615 // finds out which hash names are sorted with
1616 static int what_hash(struct super_block *s)
1617 {
1618 __u32 code;
1619
1620 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1621
1622 /* reiserfs_hash_detect() == true if any of the hash mount options
1623 ** were used. We must check them to make sure the user isn't
1624 ** using a bad hash value
1625 */
1626 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1627 code = find_hash_out(s);
1628
1629 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1630 /* detection has found the hash, and we must check against the
1631 ** mount options
1632 */
1633 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1634 reiserfs_warning(s, "reiserfs-2507",
1635 "Error, %s hash detected, "
1636 "unable to force rupasov hash",
1637 reiserfs_hashname(code));
1638 code = UNSET_HASH;
1639 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1640 reiserfs_warning(s, "reiserfs-2508",
1641 "Error, %s hash detected, "
1642 "unable to force tea hash",
1643 reiserfs_hashname(code));
1644 code = UNSET_HASH;
1645 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1646 reiserfs_warning(s, "reiserfs-2509",
1647 "Error, %s hash detected, "
1648 "unable to force r5 hash",
1649 reiserfs_hashname(code));
1650 code = UNSET_HASH;
1651 }
1652 } else {
1653 /* find_hash_out was not called or could not determine the hash */
1654 if (reiserfs_rupasov_hash(s)) {
1655 code = YURA_HASH;
1656 } else if (reiserfs_tea_hash(s)) {
1657 code = TEA_HASH;
1658 } else if (reiserfs_r5_hash(s)) {
1659 code = R5_HASH;
1660 }
1661 }
1662
1663 /* if we are mounted RW, and we have a new valid hash code, update
1664 ** the super
1665 */
1666 if (code != UNSET_HASH &&
1667 !(s->s_flags & MS_RDONLY) &&
1668 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1669 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1670 }
1671 return code;
1672 }
1673
1674 // return pointer to appropriate function
1675 static hashf_t hash_function(struct super_block *s)
1676 {
1677 switch (what_hash(s)) {
1678 case TEA_HASH:
1679 reiserfs_info(s, "Using tea hash to sort names\n");
1680 return keyed_hash;
1681 case YURA_HASH:
1682 reiserfs_info(s, "Using rupasov hash to sort names\n");
1683 return yura_hash;
1684 case R5_HASH:
1685 reiserfs_info(s, "Using r5 hash to sort names\n");
1686 return r5_hash;
1687 }
1688 return NULL;
1689 }
1690
1691 // this is used to set up correct value for old partitions
1692 static int function2code(hashf_t func)
1693 {
1694 if (func == keyed_hash)
1695 return TEA_HASH;
1696 if (func == yura_hash)
1697 return YURA_HASH;
1698 if (func == r5_hash)
1699 return R5_HASH;
1700
1701 BUG(); // should never happen
1702
1703 return 0;
1704 }
1705
1706 #define SWARN(silent, s, id, ...) \
1707 if (!(silent)) \
1708 reiserfs_warning(s, id, __VA_ARGS__)
1709
1710 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1711 {
1712 struct inode *root_inode;
1713 struct reiserfs_transaction_handle th;
1714 int old_format = 0;
1715 unsigned long blocks;
1716 unsigned int commit_max_age = 0;
1717 int jinit_done = 0;
1718 struct reiserfs_iget_args args;
1719 struct reiserfs_super_block *rs;
1720 char *jdev_name;
1721 struct reiserfs_sb_info *sbi;
1722 int errval = -EINVAL;
1723 char *qf_names[MAXQUOTAS] = {};
1724 unsigned int qfmt = 0;
1725
1726 save_mount_options(s, data);
1727
1728 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1729 if (!sbi)
1730 return -ENOMEM;
1731 s->s_fs_info = sbi;
1732 /* Set default values for options: non-aggressive tails, RO on errors */
1733 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1734 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1735 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1736 /* no preallocation minimum, be smart in
1737 reiserfs_file_write instead */
1738 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1739 /* Preallocate by 16 blocks (17-1) at once */
1740 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1741 /* setup default block allocator options */
1742 reiserfs_init_alloc_options(s);
1743
1744 mutex_init(&REISERFS_SB(s)->lock);
1745 REISERFS_SB(s)->lock_depth = -1;
1746
1747 jdev_name = NULL;
1748 if (reiserfs_parse_options
1749 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1750 &commit_max_age, qf_names, &qfmt) == 0) {
1751 goto error_unlocked;
1752 }
1753 if (jdev_name && jdev_name[0]) {
1754 REISERFS_SB(s)->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1755 if (!REISERFS_SB(s)->s_jdev) {
1756 SWARN(silent, s, "", "Cannot allocate memory for "
1757 "journal device name");
1758 goto error;
1759 }
1760 }
1761 #ifdef CONFIG_QUOTA
1762 handle_quota_files(s, qf_names, &qfmt);
1763 #endif
1764
1765 if (blocks) {
1766 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1767 goto error_unlocked;
1768 }
1769
1770 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1771 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1772 old_format = 1;
1773 /* try new format (64-th 1k block), which can contain reiserfs super block */
1774 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1775 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1776 reiserfs_bdevname(s));
1777 goto error_unlocked;
1778 }
1779
1780 rs = SB_DISK_SUPER_BLOCK(s);
1781 /* Let's do basic sanity check to verify that underlying device is not
1782 smaller than the filesystem. If the check fails then abort and scream,
1783 because bad stuff will happen otherwise. */
1784 if (s->s_bdev && s->s_bdev->bd_inode
1785 && i_size_read(s->s_bdev->bd_inode) <
1786 sb_block_count(rs) * sb_blocksize(rs)) {
1787 SWARN(silent, s, "", "Filesystem cannot be "
1788 "mounted because it is bigger than the device");
1789 SWARN(silent, s, "", "You may need to run fsck "
1790 "or increase size of your LVM partition");
1791 SWARN(silent, s, "", "Or may be you forgot to "
1792 "reboot after fdisk when it told you to");
1793 goto error_unlocked;
1794 }
1795
1796 sbi->s_mount_state = SB_REISERFS_STATE(s);
1797 sbi->s_mount_state = REISERFS_VALID_FS;
1798
1799 if ((errval = reiserfs_init_bitmap_cache(s))) {
1800 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1801 goto error_unlocked;
1802 }
1803
1804 errval = -EINVAL;
1805 #ifdef CONFIG_REISERFS_CHECK
1806 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1807 SWARN(silent, s, "", "- it is slow mode for debugging.");
1808 #endif
1809
1810 /* make data=ordered the default */
1811 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1812 !reiserfs_data_writeback(s)) {
1813 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1814 }
1815
1816 if (reiserfs_data_log(s)) {
1817 reiserfs_info(s, "using journaled data mode\n");
1818 } else if (reiserfs_data_ordered(s)) {
1819 reiserfs_info(s, "using ordered data mode\n");
1820 } else {
1821 reiserfs_info(s, "using writeback data mode\n");
1822 }
1823 if (reiserfs_barrier_flush(s)) {
1824 printk("reiserfs: using flush barriers\n");
1825 }
1826
1827 // set_device_ro(s->s_dev, 1) ;
1828 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1829 SWARN(silent, s, "sh-2022",
1830 "unable to initialize journal space");
1831 goto error_unlocked;
1832 } else {
1833 jinit_done = 1; /* once this is set, journal_release must be called
1834 ** if we error out of the mount
1835 */
1836 }
1837
1838 if (reread_meta_blocks(s)) {
1839 SWARN(silent, s, "jmacd-9",
1840 "unable to reread meta blocks after journal init");
1841 goto error_unlocked;
1842 }
1843
1844 if (replay_only(s))
1845 goto error_unlocked;
1846
1847 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1848 SWARN(silent, s, "clm-7000",
1849 "Detected readonly device, marking FS readonly");
1850 s->s_flags |= MS_RDONLY;
1851 }
1852 args.objectid = REISERFS_ROOT_OBJECTID;
1853 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1854 root_inode =
1855 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1856 reiserfs_init_locked_inode, (void *)(&args));
1857 if (!root_inode) {
1858 SWARN(silent, s, "jmacd-10", "get root inode failed");
1859 goto error_unlocked;
1860 }
1861
1862 /*
1863 * This path assumed to be called with the BKL in the old times.
1864 * Now we have inherited the big reiserfs lock from it and many
1865 * reiserfs helpers called in the mount path and elsewhere require
1866 * this lock to be held even if it's not always necessary. Let's be
1867 * conservative and hold it early. The window can be reduced after
1868 * careful review of the code.
1869 */
1870 reiserfs_write_lock(s);
1871
1872 if (root_inode->i_state & I_NEW) {
1873 reiserfs_read_locked_inode(root_inode, &args);
1874 unlock_new_inode(root_inode);
1875 }
1876
1877 s->s_root = d_alloc_root(root_inode);
1878 if (!s->s_root) {
1879 iput(root_inode);
1880 goto error;
1881 }
1882 // define and initialize hash function
1883 sbi->s_hash_function = hash_function(s);
1884 if (sbi->s_hash_function == NULL) {
1885 dput(s->s_root);
1886 s->s_root = NULL;
1887 goto error;
1888 }
1889
1890 if (is_reiserfs_3_5(rs)
1891 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1892 set_bit(REISERFS_3_5, &(sbi->s_properties));
1893 else if (old_format)
1894 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1895 else
1896 set_bit(REISERFS_3_6, &(sbi->s_properties));
1897
1898 if (!(s->s_flags & MS_RDONLY)) {
1899
1900 errval = journal_begin(&th, s, 1);
1901 if (errval) {
1902 dput(s->s_root);
1903 s->s_root = NULL;
1904 goto error;
1905 }
1906 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1907
1908 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1909 set_sb_fs_state(rs, 0);
1910
1911 /* Clear out s_bmap_nr if it would wrap. We can handle this
1912 * case, but older revisions can't. This will cause the
1913 * file system to fail mount on those older implementations,
1914 * avoiding corruption. -jeffm */
1915 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1916 sb_bmap_nr(rs) != 0) {
1917 reiserfs_warning(s, "super-2030", "This file system "
1918 "claims to use %u bitmap blocks in "
1919 "its super block, but requires %u. "
1920 "Clearing to zero.", sb_bmap_nr(rs),
1921 reiserfs_bmap_count(s));
1922
1923 set_sb_bmap_nr(rs, 0);
1924 }
1925
1926 if (old_format_only(s)) {
1927 /* filesystem of format 3.5 either with standard or non-standard
1928 journal */
1929 if (convert_reiserfs(s)) {
1930 /* and -o conv is given */
1931 if (!silent)
1932 reiserfs_info(s,
1933 "converting 3.5 filesystem to the 3.6 format");
1934
1935 if (is_reiserfs_3_5(rs))
1936 /* put magic string of 3.6 format. 2.2 will not be able to
1937 mount this filesystem anymore */
1938 memcpy(rs->s_v1.s_magic,
1939 reiserfs_3_6_magic_string,
1940 sizeof
1941 (reiserfs_3_6_magic_string));
1942
1943 set_sb_version(rs, REISERFS_VERSION_2);
1944 reiserfs_convert_objectid_map_v1(s);
1945 set_bit(REISERFS_3_6, &(sbi->s_properties));
1946 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1947 } else if (!silent) {
1948 reiserfs_info(s, "using 3.5.x disk format\n");
1949 }
1950 } else
1951 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1952
1953
1954 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1955 errval = journal_end(&th, s, 1);
1956 if (errval) {
1957 dput(s->s_root);
1958 s->s_root = NULL;
1959 goto error;
1960 }
1961
1962 if ((errval = reiserfs_lookup_privroot(s)) ||
1963 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1964 dput(s->s_root);
1965 s->s_root = NULL;
1966 goto error;
1967 }
1968
1969 /* look for files which were to be removed in previous session */
1970 finish_unfinished(s);
1971 } else {
1972 if (old_format_only(s) && !silent) {
1973 reiserfs_info(s, "using 3.5.x disk format\n");
1974 }
1975
1976 if ((errval = reiserfs_lookup_privroot(s)) ||
1977 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1978 dput(s->s_root);
1979 s->s_root = NULL;
1980 goto error;
1981 }
1982 }
1983 // mark hash in super block: it could be unset. overwrite should be ok
1984 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1985
1986 handle_attrs(s);
1987
1988 reiserfs_proc_info_init(s);
1989
1990 init_waitqueue_head(&(sbi->s_wait));
1991 spin_lock_init(&sbi->bitmap_lock);
1992
1993 reiserfs_write_unlock(s);
1994
1995 return (0);
1996
1997 error:
1998 reiserfs_write_unlock(s);
1999
2000 error_unlocked:
2001 /* kill the commit thread, free journal ram */
2002 if (jinit_done) {
2003 reiserfs_write_lock(s);
2004 journal_release_error(NULL, s);
2005 reiserfs_write_unlock(s);
2006 }
2007
2008 reiserfs_free_bitmap_cache(s);
2009 if (SB_BUFFER_WITH_SB(s))
2010 brelse(SB_BUFFER_WITH_SB(s));
2011 #ifdef CONFIG_QUOTA
2012 {
2013 int j;
2014 for (j = 0; j < MAXQUOTAS; j++)
2015 kfree(qf_names[j]);
2016 }
2017 #endif
2018 kfree(sbi);
2019
2020 s->s_fs_info = NULL;
2021 return errval;
2022 }
2023
2024 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2025 {
2026 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2027
2028 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2029 buf->f_bfree = sb_free_blocks(rs);
2030 buf->f_bavail = buf->f_bfree;
2031 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2032 buf->f_bsize = dentry->d_sb->s_blocksize;
2033 /* changed to accommodate gcc folks. */
2034 buf->f_type = REISERFS_SUPER_MAGIC;
2035 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2036 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2037 sizeof(rs->s_uuid)/2);
2038
2039 return 0;
2040 }
2041
2042 #ifdef CONFIG_QUOTA
2043 static int reiserfs_write_dquot(struct dquot *dquot)
2044 {
2045 struct reiserfs_transaction_handle th;
2046 int ret, err;
2047
2048 reiserfs_write_lock(dquot->dq_sb);
2049 ret =
2050 journal_begin(&th, dquot->dq_sb,
2051 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2052 if (ret)
2053 goto out;
2054 ret = dquot_commit(dquot);
2055 err =
2056 journal_end(&th, dquot->dq_sb,
2057 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2058 if (!ret && err)
2059 ret = err;
2060 out:
2061 reiserfs_write_unlock(dquot->dq_sb);
2062 return ret;
2063 }
2064
2065 static int reiserfs_acquire_dquot(struct dquot *dquot)
2066 {
2067 struct reiserfs_transaction_handle th;
2068 int ret, err;
2069
2070 reiserfs_write_lock(dquot->dq_sb);
2071 ret =
2072 journal_begin(&th, dquot->dq_sb,
2073 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2074 if (ret)
2075 goto out;
2076 ret = dquot_acquire(dquot);
2077 err =
2078 journal_end(&th, dquot->dq_sb,
2079 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2080 if (!ret && err)
2081 ret = err;
2082 out:
2083 reiserfs_write_unlock(dquot->dq_sb);
2084 return ret;
2085 }
2086
2087 static int reiserfs_release_dquot(struct dquot *dquot)
2088 {
2089 struct reiserfs_transaction_handle th;
2090 int ret, err;
2091
2092 reiserfs_write_lock(dquot->dq_sb);
2093 ret =
2094 journal_begin(&th, dquot->dq_sb,
2095 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2096 if (ret) {
2097 /* Release dquot anyway to avoid endless cycle in dqput() */
2098 dquot_release(dquot);
2099 goto out;
2100 }
2101 ret = dquot_release(dquot);
2102 err =
2103 journal_end(&th, dquot->dq_sb,
2104 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2105 if (!ret && err)
2106 ret = err;
2107 out:
2108 reiserfs_write_unlock(dquot->dq_sb);
2109 return ret;
2110 }
2111
2112 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2113 {
2114 /* Are we journaling quotas? */
2115 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2116 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2117 dquot_mark_dquot_dirty(dquot);
2118 return reiserfs_write_dquot(dquot);
2119 } else
2120 return dquot_mark_dquot_dirty(dquot);
2121 }
2122
2123 static int reiserfs_write_info(struct super_block *sb, int type)
2124 {
2125 struct reiserfs_transaction_handle th;
2126 int ret, err;
2127
2128 /* Data block + inode block */
2129 reiserfs_write_lock(sb);
2130 ret = journal_begin(&th, sb, 2);
2131 if (ret)
2132 goto out;
2133 ret = dquot_commit_info(sb, type);
2134 err = journal_end(&th, sb, 2);
2135 if (!ret && err)
2136 ret = err;
2137 out:
2138 reiserfs_write_unlock(sb);
2139 return ret;
2140 }
2141
2142 /*
2143 * Turn on quotas during mount time - we need to find the quota file and such...
2144 */
2145 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2146 {
2147 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2148 REISERFS_SB(sb)->s_jquota_fmt, type);
2149 }
2150
2151 /*
2152 * Standard function to be called on quota_on
2153 */
2154 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2155 struct path *path)
2156 {
2157 int err;
2158 struct inode *inode;
2159 struct reiserfs_transaction_handle th;
2160 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2161
2162 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
2163 return -EINVAL;
2164
2165 /* Quotafile not on the same filesystem? */
2166 if (path->dentry->d_sb != sb) {
2167 err = -EXDEV;
2168 goto out;
2169 }
2170 inode = path->dentry->d_inode;
2171 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2172 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2173 err = reiserfs_unpack(inode, NULL);
2174 if (err) {
2175 reiserfs_warning(sb, "super-6520",
2176 "Unpacking tail of quota file failed"
2177 " (%d). Cannot turn on quotas.", err);
2178 err = -EINVAL;
2179 goto out;
2180 }
2181 mark_inode_dirty(inode);
2182 }
2183 /* Journaling quota? */
2184 if (REISERFS_SB(sb)->s_qf_names[type]) {
2185 /* Quotafile not of fs root? */
2186 if (path->dentry->d_parent != sb->s_root)
2187 reiserfs_warning(sb, "super-6521",
2188 "Quota file not on filesystem root. "
2189 "Journalled quota will not work.");
2190 }
2191
2192 /*
2193 * When we journal data on quota file, we have to flush journal to see
2194 * all updates to the file when we bypass pagecache...
2195 */
2196 if (reiserfs_file_data_log(inode)) {
2197 /* Just start temporary transaction and finish it */
2198 err = journal_begin(&th, sb, 1);
2199 if (err)
2200 goto out;
2201 err = journal_end_sync(&th, sb, 1);
2202 if (err)
2203 goto out;
2204 }
2205 err = dquot_quota_on(sb, type, format_id, path);
2206 out:
2207 return err;
2208 }
2209
2210 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2211 * acquiring the locks... As quota files are never truncated and quota code
2212 * itself serializes the operations (and no one else should touch the files)
2213 * we don't have to be afraid of races */
2214 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2215 size_t len, loff_t off)
2216 {
2217 struct inode *inode = sb_dqopt(sb)->files[type];
2218 unsigned long blk = off >> sb->s_blocksize_bits;
2219 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2220 size_t toread;
2221 struct buffer_head tmp_bh, *bh;
2222 loff_t i_size = i_size_read(inode);
2223
2224 if (off > i_size)
2225 return 0;
2226 if (off + len > i_size)
2227 len = i_size - off;
2228 toread = len;
2229 while (toread > 0) {
2230 tocopy =
2231 sb->s_blocksize - offset <
2232 toread ? sb->s_blocksize - offset : toread;
2233 tmp_bh.b_state = 0;
2234 /* Quota files are without tails so we can safely use this function */
2235 reiserfs_write_lock(sb);
2236 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2237 reiserfs_write_unlock(sb);
2238 if (err)
2239 return err;
2240 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2241 memset(data, 0, tocopy);
2242 else {
2243 bh = sb_bread(sb, tmp_bh.b_blocknr);
2244 if (!bh)
2245 return -EIO;
2246 memcpy(data, bh->b_data + offset, tocopy);
2247 brelse(bh);
2248 }
2249 offset = 0;
2250 toread -= tocopy;
2251 data += tocopy;
2252 blk++;
2253 }
2254 return len;
2255 }
2256
2257 /* Write to quotafile (we know the transaction is already started and has
2258 * enough credits) */
2259 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2260 const char *data, size_t len, loff_t off)
2261 {
2262 struct inode *inode = sb_dqopt(sb)->files[type];
2263 unsigned long blk = off >> sb->s_blocksize_bits;
2264 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2265 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2266 size_t towrite = len;
2267 struct buffer_head tmp_bh, *bh;
2268
2269 if (!current->journal_info) {
2270 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2271 " cancelled because transaction is not started.\n",
2272 (unsigned long long)off, (unsigned long long)len);
2273 return -EIO;
2274 }
2275 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2276 while (towrite > 0) {
2277 tocopy = sb->s_blocksize - offset < towrite ?
2278 sb->s_blocksize - offset : towrite;
2279 tmp_bh.b_state = 0;
2280 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2281 if (err)
2282 goto out;
2283 if (offset || tocopy != sb->s_blocksize)
2284 bh = sb_bread(sb, tmp_bh.b_blocknr);
2285 else
2286 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2287 if (!bh) {
2288 err = -EIO;
2289 goto out;
2290 }
2291 lock_buffer(bh);
2292 memcpy(bh->b_data + offset, data, tocopy);
2293 flush_dcache_page(bh->b_page);
2294 set_buffer_uptodate(bh);
2295 unlock_buffer(bh);
2296 reiserfs_prepare_for_journal(sb, bh, 1);
2297 journal_mark_dirty(current->journal_info, sb, bh);
2298 if (!journal_quota)
2299 reiserfs_add_ordered_list(inode, bh);
2300 brelse(bh);
2301 offset = 0;
2302 towrite -= tocopy;
2303 data += tocopy;
2304 blk++;
2305 }
2306 out:
2307 if (len == towrite) {
2308 mutex_unlock(&inode->i_mutex);
2309 return err;
2310 }
2311 if (inode->i_size < off + len - towrite)
2312 i_size_write(inode, off + len - towrite);
2313 inode->i_version++;
2314 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2315 mark_inode_dirty(inode);
2316 mutex_unlock(&inode->i_mutex);
2317 return len - towrite;
2318 }
2319
2320 #endif
2321
2322 static struct dentry *get_super_block(struct file_system_type *fs_type,
2323 int flags, const char *dev_name,
2324 void *data)
2325 {
2326 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2327 }
2328
2329 static int __init init_reiserfs_fs(void)
2330 {
2331 int ret;
2332
2333 if ((ret = init_inodecache())) {
2334 return ret;
2335 }
2336
2337 reiserfs_proc_info_global_init();
2338
2339 ret = register_filesystem(&reiserfs_fs_type);
2340
2341 if (ret == 0) {
2342 return 0;
2343 }
2344
2345 reiserfs_proc_info_global_done();
2346 destroy_inodecache();
2347
2348 return ret;
2349 }
2350
2351 static void __exit exit_reiserfs_fs(void)
2352 {
2353 reiserfs_proc_info_global_done();
2354 unregister_filesystem(&reiserfs_fs_type);
2355 destroy_inodecache();
2356 }
2357
2358 struct file_system_type reiserfs_fs_type = {
2359 .owner = THIS_MODULE,
2360 .name = "reiserfs",
2361 .mount = get_super_block,
2362 .kill_sb = reiserfs_kill_sb,
2363 .fs_flags = FS_REQUIRES_DEV,
2364 };
2365
2366 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2367 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2368 MODULE_LICENSE("GPL");
2369
2370 module_init(init_reiserfs_fs);
2371 module_exit(exit_reiserfs_fs);