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ehea: fix skb_frag_size typo
[linux-btrfs-devel.git] / fs / reiserfs / super.c
blob14363b96b6afafa74a80c2c66553c8d914064268
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
32 struct file_system_type reiserfs_fs_type;
33
34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
37
38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
39 {
40 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
41 strlen(reiserfs_3_5_magic_string));
42 }
43
44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
45 {
46 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
47 strlen(reiserfs_3_6_magic_string));
48 }
49
50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
51 {
52 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
53 strlen(reiserfs_jr_magic_string));
54 }
55
56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
57 {
58 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
59 is_reiserfs_jr(rs));
60 }
61
62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
64
65 static int reiserfs_sync_fs(struct super_block *s, int wait)
66 {
67 struct reiserfs_transaction_handle th;
68
69 reiserfs_write_lock(s);
70 if (!journal_begin(&th, s, 1))
71 if (!journal_end_sync(&th, s, 1))
72 reiserfs_flush_old_commits(s);
73 s->s_dirt = 0; /* Even if it's not true.
74 * We'll loop forever in sync_supers otherwise */
75 reiserfs_write_unlock(s);
76 return 0;
77 }
78
79 static void reiserfs_write_super(struct super_block *s)
80 {
81 reiserfs_sync_fs(s, 1);
82 }
83
84 static int reiserfs_freeze(struct super_block *s)
85 {
86 struct reiserfs_transaction_handle th;
87 reiserfs_write_lock(s);
88 if (!(s->s_flags & MS_RDONLY)) {
89 int err = journal_begin(&th, s, 1);
90 if (err) {
91 reiserfs_block_writes(&th);
92 } else {
93 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
94 1);
95 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
96 reiserfs_block_writes(&th);
97 journal_end_sync(&th, s, 1);
98 }
99 }
100 s->s_dirt = 0;
101 reiserfs_write_unlock(s);
102 return 0;
103 }
104
105 static int reiserfs_unfreeze(struct super_block *s)
106 {
107 reiserfs_allow_writes(s);
108 return 0;
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114 file it points to. It can either happen if unlink is completed but
115 "save unlink" removal, or if file has both unlink and truncate
116 pending and as unlink completes first (because key of "save link"
117 protecting unlink is bigger that a key lf "save link" which
118 protects truncate), so there left no items to make truncate
119 completion on */
120 static int remove_save_link_only(struct super_block *s,
121 struct reiserfs_key *key, int oid_free)
122 {
123 struct reiserfs_transaction_handle th;
124 int err;
125
126 /* we are going to do one balancing */
127 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128 if (err)
129 return err;
130
131 reiserfs_delete_solid_item(&th, NULL, key);
132 if (oid_free)
133 /* removals are protected by direct items */
134 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146 INITIALIZE_PATH(path);
147 struct cpu_key max_cpu_key, obj_key;
148 struct reiserfs_key save_link_key, last_inode_key;
149 int retval = 0;
150 struct item_head *ih;
151 struct buffer_head *bh;
152 int item_pos;
153 char *item;
154 int done;
155 struct inode *inode;
156 int truncate;
157 #ifdef CONFIG_QUOTA
158 int i;
159 int ms_active_set;
160 int quota_enabled[MAXQUOTAS];
161 #endif
162
163 /* compose key to look for "save" links */
164 max_cpu_key.version = KEY_FORMAT_3_5;
165 max_cpu_key.on_disk_key.k_dir_id = ~0U;
166 max_cpu_key.on_disk_key.k_objectid = ~0U;
167 set_cpu_key_k_offset(&max_cpu_key, ~0U);
168 max_cpu_key.key_length = 3;
169
170 memset(&last_inode_key, 0, sizeof(last_inode_key));
171
172 #ifdef CONFIG_QUOTA
173 /* Needed for iput() to work correctly and not trash data */
174 if (s->s_flags & MS_ACTIVE) {
175 ms_active_set = 0;
176 } else {
177 ms_active_set = 1;
178 s->s_flags |= MS_ACTIVE;
179 }
180 /* Turn on quotas so that they are updated correctly */
181 for (i = 0; i < MAXQUOTAS; i++) {
182 quota_enabled[i] = 1;
183 if (REISERFS_SB(s)->s_qf_names[i]) {
184 int ret;
185
186 if (sb_has_quota_active(s, i)) {
187 quota_enabled[i] = 0;
188 continue;
189 }
190 ret = reiserfs_quota_on_mount(s, i);
191 if (ret < 0)
192 reiserfs_warning(s, "reiserfs-2500",
193 "cannot turn on journaled "
194 "quota: error %d", ret);
195 }
196 }
197 #endif
198
199 done = 0;
200 REISERFS_SB(s)->s_is_unlinked_ok = 1;
201 while (!retval) {
202 retval = search_item(s, &max_cpu_key, &path);
203 if (retval != ITEM_NOT_FOUND) {
204 reiserfs_error(s, "vs-2140",
205 "search_by_key returned %d", retval);
206 break;
207 }
208
209 bh = get_last_bh(&path);
210 item_pos = get_item_pos(&path);
211 if (item_pos != B_NR_ITEMS(bh)) {
212 reiserfs_warning(s, "vs-2060",
213 "wrong position found");
214 break;
215 }
216 item_pos--;
217 ih = B_N_PITEM_HEAD(bh, item_pos);
218
219 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
220 /* there are no "save" links anymore */
221 break;
222
223 save_link_key = ih->ih_key;
224 if (is_indirect_le_ih(ih))
225 truncate = 1;
226 else
227 truncate = 0;
228
229 /* reiserfs_iget needs k_dirid and k_objectid only */
230 item = B_I_PITEM(bh, ih);
231 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
232 obj_key.on_disk_key.k_objectid =
233 le32_to_cpu(ih->ih_key.k_objectid);
234 obj_key.on_disk_key.k_offset = 0;
235 obj_key.on_disk_key.k_type = 0;
236
237 pathrelse(&path);
238
239 inode = reiserfs_iget(s, &obj_key);
240 if (!inode) {
241 /* the unlink almost completed, it just did not manage to remove
242 "save" link and release objectid */
243 reiserfs_warning(s, "vs-2180", "iget failed for %K",
244 &obj_key);
245 retval = remove_save_link_only(s, &save_link_key, 1);
246 continue;
247 }
248
249 if (!truncate && inode->i_nlink) {
250 /* file is not unlinked */
251 reiserfs_warning(s, "vs-2185",
252 "file %K is not unlinked",
253 &obj_key);
254 retval = remove_save_link_only(s, &save_link_key, 0);
255 continue;
256 }
257 dquot_initialize(inode);
258
259 if (truncate && S_ISDIR(inode->i_mode)) {
260 /* We got a truncate request for a dir which is impossible.
261 The only imaginable way is to execute unfinished truncate request
262 then boot into old kernel, remove the file and create dir with
263 the same key. */
264 reiserfs_warning(s, "green-2101",
265 "impossible truncate on a "
266 "directory %k. Please report",
267 INODE_PKEY(inode));
268 retval = remove_save_link_only(s, &save_link_key, 0);
269 truncate = 0;
270 iput(inode);
271 continue;
272 }
273
274 if (truncate) {
275 REISERFS_I(inode)->i_flags |=
276 i_link_saved_truncate_mask;
277 /* not completed truncate found. New size was committed together
278 with "save" link */
279 reiserfs_info(s, "Truncating %k to %Ld ..",
280 INODE_PKEY(inode), inode->i_size);
281 reiserfs_truncate_file(inode,
282 0
283 /*don't update modification time */
284 );
285 retval = remove_save_link(inode, truncate);
286 } else {
287 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
288 /* not completed unlink (rmdir) found */
289 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
290 if (memcmp(&last_inode_key, INODE_PKEY(inode),
291 sizeof(last_inode_key))){
292 last_inode_key = *INODE_PKEY(inode);
293 /* removal gets completed in iput */
294 retval = 0;
295 } else {
296 reiserfs_warning(s, "super-2189", "Dead loop "
297 "in finish_unfinished "
298 "detected, just remove "
299 "save link\n");
300 retval = remove_save_link_only(s,
301 &save_link_key, 0);
302 }
303 }
304
305 iput(inode);
306 printk("done\n");
307 done++;
308 }
309 REISERFS_SB(s)->s_is_unlinked_ok = 0;
310
311 #ifdef CONFIG_QUOTA
312 /* Turn quotas off */
313 for (i = 0; i < MAXQUOTAS; i++) {
314 if (sb_dqopt(s)->files[i] && quota_enabled[i])
315 dquot_quota_off(s, i);
316 }
317 if (ms_active_set)
318 /* Restore the flag back */
319 s->s_flags &= ~MS_ACTIVE;
320 #endif
321 pathrelse(&path);
322 if (done)
323 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
324 "Completed\n", done);
325 return retval;
326 }
327
328 /* to protect file being unlinked from getting lost we "safe" link files
329 being unlinked. This link will be deleted in the same transaction with last
330 item of file. mounting the filesystem we scan all these links and remove
331 files which almost got lost */
332 void add_save_link(struct reiserfs_transaction_handle *th,
333 struct inode *inode, int truncate)
334 {
335 INITIALIZE_PATH(path);
336 int retval;
337 struct cpu_key key;
338 struct item_head ih;
339 __le32 link;
340
341 BUG_ON(!th->t_trans_id);
342
343 /* file can only get one "save link" of each kind */
344 RFALSE(truncate &&
345 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
346 "saved link already exists for truncated inode %lx",
347 (long)inode->i_ino);
348 RFALSE(!truncate &&
349 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
350 "saved link already exists for unlinked inode %lx",
351 (long)inode->i_ino);
352
353 /* setup key of "save" link */
354 key.version = KEY_FORMAT_3_5;
355 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
356 key.on_disk_key.k_objectid = inode->i_ino;
357 if (!truncate) {
358 /* unlink, rmdir, rename */
359 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
360 set_cpu_key_k_type(&key, TYPE_DIRECT);
361
362 /* item head of "safe" link */
363 make_le_item_head(&ih, &key, key.version,
364 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
365 4 /*length */ , 0xffff /*free space */ );
366 } else {
367 /* truncate */
368 if (S_ISDIR(inode->i_mode))
369 reiserfs_warning(inode->i_sb, "green-2102",
370 "Adding a truncate savelink for "
371 "a directory %k! Please report",
372 INODE_PKEY(inode));
373 set_cpu_key_k_offset(&key, 1);
374 set_cpu_key_k_type(&key, TYPE_INDIRECT);
375
376 /* item head of "safe" link */
377 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
378 4 /*length */ , 0 /*free space */ );
379 }
380 key.key_length = 3;
381
382 /* look for its place in the tree */
383 retval = search_item(inode->i_sb, &key, &path);
384 if (retval != ITEM_NOT_FOUND) {
385 if (retval != -ENOSPC)
386 reiserfs_error(inode->i_sb, "vs-2100",
387 "search_by_key (%K) returned %d", &key,
388 retval);
389 pathrelse(&path);
390 return;
391 }
392
393 /* body of "save" link */
394 link = INODE_PKEY(inode)->k_dir_id;
395
396 /* put "save" link into tree, don't charge quota to anyone */
397 retval =
398 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
399 if (retval) {
400 if (retval != -ENOSPC)
401 reiserfs_error(inode->i_sb, "vs-2120",
402 "insert_item returned %d", retval);
403 } else {
404 if (truncate)
405 REISERFS_I(inode)->i_flags |=
406 i_link_saved_truncate_mask;
407 else
408 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
409 }
410 }
411
412 /* this opens transaction unlike add_save_link */
413 int remove_save_link(struct inode *inode, int truncate)
414 {
415 struct reiserfs_transaction_handle th;
416 struct reiserfs_key key;
417 int err;
418
419 /* we are going to do one balancing only */
420 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
421 if (err)
422 return err;
423
424 /* setup key of "save" link */
425 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
426 key.k_objectid = INODE_PKEY(inode)->k_objectid;
427 if (!truncate) {
428 /* unlink, rmdir, rename */
429 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
430 1 + inode->i_sb->s_blocksize);
431 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
432 } else {
433 /* truncate */
434 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
435 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
436 }
437
438 if ((truncate &&
439 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
440 (!truncate &&
441 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
442 /* don't take quota bytes from anywhere */
443 reiserfs_delete_solid_item(&th, NULL, &key);
444 if (!truncate) {
445 reiserfs_release_objectid(&th, inode->i_ino);
446 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
447 } else
448 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
449
450 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
451 }
452
453 static void reiserfs_kill_sb(struct super_block *s)
454 {
455 if (REISERFS_SB(s)) {
456 if (REISERFS_SB(s)->xattr_root) {
457 d_invalidate(REISERFS_SB(s)->xattr_root);
458 dput(REISERFS_SB(s)->xattr_root);
459 REISERFS_SB(s)->xattr_root = NULL;
460 }
461 if (REISERFS_SB(s)->priv_root) {
462 d_invalidate(REISERFS_SB(s)->priv_root);
463 dput(REISERFS_SB(s)->priv_root);
464 REISERFS_SB(s)->priv_root = NULL;
465 }
466 }
467
468 kill_block_super(s);
469 }
470
471 static void reiserfs_put_super(struct super_block *s)
472 {
473 struct reiserfs_transaction_handle th;
474 th.t_trans_id = 0;
475
476 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
477
478 reiserfs_write_lock(s);
479
480 if (s->s_dirt)
481 reiserfs_write_super(s);
482
483 /* change file system state to current state if it was mounted with read-write permissions */
484 if (!(s->s_flags & MS_RDONLY)) {
485 if (!journal_begin(&th, s, 10)) {
486 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
487 1);
488 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
489 REISERFS_SB(s)->s_mount_state);
490 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
491 }
492 }
493
494 /* note, journal_release checks for readonly mount, and can decide not
495 ** to do a journal_end
496 */
497 journal_release(&th, s);
498
499 reiserfs_free_bitmap_cache(s);
500
501 brelse(SB_BUFFER_WITH_SB(s));
502
503 print_statistics(s);
504
505 if (REISERFS_SB(s)->reserved_blocks != 0) {
506 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
507 REISERFS_SB(s)->reserved_blocks);
508 }
509
510 reiserfs_proc_info_done(s);
511
512 reiserfs_write_unlock(s);
513 mutex_destroy(&REISERFS_SB(s)->lock);
514 kfree(s->s_fs_info);
515 s->s_fs_info = NULL;
516 }
517
518 static struct kmem_cache *reiserfs_inode_cachep;
519
520 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
521 {
522 struct reiserfs_inode_info *ei;
523 ei = (struct reiserfs_inode_info *)
524 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
525 if (!ei)
526 return NULL;
527 atomic_set(&ei->openers, 0);
528 mutex_init(&ei->tailpack);
529 return &ei->vfs_inode;
530 }
531
532 static void reiserfs_i_callback(struct rcu_head *head)
533 {
534 struct inode *inode = container_of(head, struct inode, i_rcu);
535 INIT_LIST_HEAD(&inode->i_dentry);
536 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
537 }
538
539 static void reiserfs_destroy_inode(struct inode *inode)
540 {
541 call_rcu(&inode->i_rcu, reiserfs_i_callback);
542 }
543
544 static void init_once(void *foo)
545 {
546 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
547
548 INIT_LIST_HEAD(&ei->i_prealloc_list);
549 inode_init_once(&ei->vfs_inode);
550 }
551
552 static int init_inodecache(void)
553 {
554 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
555 sizeof(struct
556 reiserfs_inode_info),
557 0, (SLAB_RECLAIM_ACCOUNT|
558 SLAB_MEM_SPREAD),
559 init_once);
560 if (reiserfs_inode_cachep == NULL)
561 return -ENOMEM;
562 return 0;
563 }
564
565 static void destroy_inodecache(void)
566 {
567 kmem_cache_destroy(reiserfs_inode_cachep);
568 }
569
570 /* we don't mark inodes dirty, we just log them */
571 static void reiserfs_dirty_inode(struct inode *inode, int flags)
572 {
573 struct reiserfs_transaction_handle th;
574
575 int err = 0;
576 int lock_depth;
577
578 if (inode->i_sb->s_flags & MS_RDONLY) {
579 reiserfs_warning(inode->i_sb, "clm-6006",
580 "writing inode %lu on readonly FS",
581 inode->i_ino);
582 return;
583 }
584 lock_depth = reiserfs_write_lock_once(inode->i_sb);
585
586 /* this is really only used for atime updates, so they don't have
587 ** to be included in O_SYNC or fsync
588 */
589 err = journal_begin(&th, inode->i_sb, 1);
590 if (err)
591 goto out;
592
593 reiserfs_update_sd(&th, inode);
594 journal_end(&th, inode->i_sb, 1);
595
596 out:
597 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
598 }
599
600 #ifdef CONFIG_QUOTA
601 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
602 size_t, loff_t);
603 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
604 loff_t);
605 #endif
606
607 static const struct super_operations reiserfs_sops = {
608 .alloc_inode = reiserfs_alloc_inode,
609 .destroy_inode = reiserfs_destroy_inode,
610 .write_inode = reiserfs_write_inode,
611 .dirty_inode = reiserfs_dirty_inode,
612 .evict_inode = reiserfs_evict_inode,
613 .put_super = reiserfs_put_super,
614 .write_super = reiserfs_write_super,
615 .sync_fs = reiserfs_sync_fs,
616 .freeze_fs = reiserfs_freeze,
617 .unfreeze_fs = reiserfs_unfreeze,
618 .statfs = reiserfs_statfs,
619 .remount_fs = reiserfs_remount,
620 .show_options = generic_show_options,
621 #ifdef CONFIG_QUOTA
622 .quota_read = reiserfs_quota_read,
623 .quota_write = reiserfs_quota_write,
624 #endif
625 };
626
627 #ifdef CONFIG_QUOTA
628 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
629
630 static int reiserfs_write_dquot(struct dquot *);
631 static int reiserfs_acquire_dquot(struct dquot *);
632 static int reiserfs_release_dquot(struct dquot *);
633 static int reiserfs_mark_dquot_dirty(struct dquot *);
634 static int reiserfs_write_info(struct super_block *, int);
635 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
636
637 static const struct dquot_operations reiserfs_quota_operations = {
638 .write_dquot = reiserfs_write_dquot,
639 .acquire_dquot = reiserfs_acquire_dquot,
640 .release_dquot = reiserfs_release_dquot,
641 .mark_dirty = reiserfs_mark_dquot_dirty,
642 .write_info = reiserfs_write_info,
643 .alloc_dquot = dquot_alloc,
644 .destroy_dquot = dquot_destroy,
645 };
646
647 static const struct quotactl_ops reiserfs_qctl_operations = {
648 .quota_on = reiserfs_quota_on,
649 .quota_off = dquot_quota_off,
650 .quota_sync = dquot_quota_sync,
651 .get_info = dquot_get_dqinfo,
652 .set_info = dquot_set_dqinfo,
653 .get_dqblk = dquot_get_dqblk,
654 .set_dqblk = dquot_set_dqblk,
655 };
656 #endif
657
658 static const struct export_operations reiserfs_export_ops = {
659 .encode_fh = reiserfs_encode_fh,
660 .fh_to_dentry = reiserfs_fh_to_dentry,
661 .fh_to_parent = reiserfs_fh_to_parent,
662 .get_parent = reiserfs_get_parent,
663 };
664
665 /* this struct is used in reiserfs_getopt () for containing the value for those
666 mount options that have values rather than being toggles. */
667 typedef struct {
668 char *value;
669 int setmask; /* bitmask which is to set on mount_options bitmask when this
670 value is found, 0 is no bits are to be changed. */
671 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
672 value is found, 0 is no bits are to be changed. This is
673 applied BEFORE setmask */
674 } arg_desc_t;
675
676 /* Set this bit in arg_required to allow empty arguments */
677 #define REISERFS_OPT_ALLOWEMPTY 31
678
679 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
680 mount options */
681 typedef struct {
682 char *option_name;
683 int arg_required; /* 0 if argument is not required, not 0 otherwise */
684 const arg_desc_t *values; /* list of values accepted by an option */
685 int setmask; /* bitmask which is to set on mount_options bitmask when this
686 value is found, 0 is no bits are to be changed. */
687 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
688 value is found, 0 is no bits are to be changed. This is
689 applied BEFORE setmask */
690 } opt_desc_t;
691
692 /* possible values for -o data= */
693 static const arg_desc_t logging_mode[] = {
694 {"ordered", 1 << REISERFS_DATA_ORDERED,
695 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
696 {"journal", 1 << REISERFS_DATA_LOG,
697 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
698 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
699 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
700 {.value = NULL}
701 };
702
703 /* possible values for -o barrier= */
704 static const arg_desc_t barrier_mode[] = {
705 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
706 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
707 {.value = NULL}
708 };
709
710 /* possible values for "-o block-allocator=" and bits which are to be set in
711 s_mount_opt of reiserfs specific part of in-core super block */
712 static const arg_desc_t balloc[] = {
713 {"noborder", 1 << REISERFS_NO_BORDER, 0},
714 {"border", 0, 1 << REISERFS_NO_BORDER},
715 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
716 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
717 {"test4", 1 << REISERFS_TEST4, 0},
718 {"notest4", 0, 1 << REISERFS_TEST4},
719 {NULL, 0, 0}
720 };
721
722 static const arg_desc_t tails[] = {
723 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
724 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
725 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
726 {NULL, 0, 0}
727 };
728
729 static const arg_desc_t error_actions[] = {
730 {"panic", 1 << REISERFS_ERROR_PANIC,
731 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
732 {"ro-remount", 1 << REISERFS_ERROR_RO,
733 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
734 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
735 {"continue", 1 << REISERFS_ERROR_CONTINUE,
736 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
737 #endif
738 {NULL, 0, 0},
739 };
740
741 /* proceed only one option from a list *cur - string containing of mount options
742 opts - array of options which are accepted
743 opt_arg - if option is found and requires an argument and if it is specifed
744 in the input - pointer to the argument is stored here
745 bit_flags - if option requires to set a certain bit - it is set here
746 return -1 if unknown option is found, opt->arg_required otherwise */
747 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
748 char **opt_arg, unsigned long *bit_flags)
749 {
750 char *p;
751 /* foo=bar,
752 ^ ^ ^
753 | | +-- option_end
754 | +-- arg_start
755 +-- option_start
756 */
757 const opt_desc_t *opt;
758 const arg_desc_t *arg;
759
760 p = *cur;
761
762 /* assume argument cannot contain commas */
763 *cur = strchr(p, ',');
764 if (*cur) {
765 *(*cur) = '\0';
766 (*cur)++;
767 }
768
769 if (!strncmp(p, "alloc=", 6)) {
770 /* Ugly special case, probably we should redo options parser so that
771 it can understand several arguments for some options, also so that
772 it can fill several bitfields with option values. */
773 if (reiserfs_parse_alloc_options(s, p + 6)) {
774 return -1;
775 } else {
776 return 0;
777 }
778 }
779
780 /* for every option in the list */
781 for (opt = opts; opt->option_name; opt++) {
782 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
783 if (bit_flags) {
784 if (opt->clrmask ==
785 (1 << REISERFS_UNSUPPORTED_OPT))
786 reiserfs_warning(s, "super-6500",
787 "%s not supported.\n",
788 p);
789 else
790 *bit_flags &= ~opt->clrmask;
791 if (opt->setmask ==
792 (1 << REISERFS_UNSUPPORTED_OPT))
793 reiserfs_warning(s, "super-6501",
794 "%s not supported.\n",
795 p);
796 else
797 *bit_flags |= opt->setmask;
798 }
799 break;
800 }
801 }
802 if (!opt->option_name) {
803 reiserfs_warning(s, "super-6502",
804 "unknown mount option \"%s\"", p);
805 return -1;
806 }
807
808 p += strlen(opt->option_name);
809 switch (*p) {
810 case '=':
811 if (!opt->arg_required) {
812 reiserfs_warning(s, "super-6503",
813 "the option \"%s\" does not "
814 "require an argument\n",
815 opt->option_name);
816 return -1;
817 }
818 break;
819
820 case 0:
821 if (opt->arg_required) {
822 reiserfs_warning(s, "super-6504",
823 "the option \"%s\" requires an "
824 "argument\n", opt->option_name);
825 return -1;
826 }
827 break;
828 default:
829 reiserfs_warning(s, "super-6505",
830 "head of option \"%s\" is only correct\n",
831 opt->option_name);
832 return -1;
833 }
834
835 /* move to the argument, or to next option if argument is not required */
836 p++;
837
838 if (opt->arg_required
839 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
840 && !strlen(p)) {
841 /* this catches "option=," if not allowed */
842 reiserfs_warning(s, "super-6506",
843 "empty argument for \"%s\"\n",
844 opt->option_name);
845 return -1;
846 }
847
848 if (!opt->values) {
849 /* *=NULLopt_arg contains pointer to argument */
850 *opt_arg = p;
851 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
852 }
853
854 /* values possible for this option are listed in opt->values */
855 for (arg = opt->values; arg->value; arg++) {
856 if (!strcmp(p, arg->value)) {
857 if (bit_flags) {
858 *bit_flags &= ~arg->clrmask;
859 *bit_flags |= arg->setmask;
860 }
861 return opt->arg_required;
862 }
863 }
864
865 reiserfs_warning(s, "super-6506",
866 "bad value \"%s\" for option \"%s\"\n", p,
867 opt->option_name);
868 return -1;
869 }
870
871 /* returns 0 if something is wrong in option string, 1 - otherwise */
872 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
873 unsigned long *mount_options,
874 /* after the parsing phase, contains the
875 collection of bitflags defining what
876 mount options were selected. */
877 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
878 char **jdev_name,
879 unsigned int *commit_max_age,
880 char **qf_names,
881 unsigned int *qfmt)
882 {
883 int c;
884 char *arg = NULL;
885 char *pos;
886 opt_desc_t opts[] = {
887 /* Compatibility stuff, so that -o notail for old setups still work */
888 {"tails",.arg_required = 't',.values = tails},
889 {"notail",.clrmask =
890 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
891 {"conv",.setmask = 1 << REISERFS_CONVERT},
892 {"attrs",.setmask = 1 << REISERFS_ATTRS},
893 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
894 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
895 #ifdef CONFIG_REISERFS_FS_XATTR
896 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
897 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
898 #else
899 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
900 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
901 #endif
902 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
903 {"acl",.setmask = 1 << REISERFS_POSIXACL},
904 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
905 #else
906 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
907 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 #endif
909 {.option_name = "nolog"},
910 {"replayonly",.setmask = 1 << REPLAYONLY},
911 {"block-allocator",.arg_required = 'a',.values = balloc},
912 {"data",.arg_required = 'd',.values = logging_mode},
913 {"barrier",.arg_required = 'b',.values = barrier_mode},
914 {"resize",.arg_required = 'r',.values = NULL},
915 {"jdev",.arg_required = 'j',.values = NULL},
916 {"nolargeio",.arg_required = 'w',.values = NULL},
917 {"commit",.arg_required = 'c',.values = NULL},
918 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
919 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
920 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
921 {"errors",.arg_required = 'e',.values = error_actions},
922 {"usrjquota",.arg_required =
923 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
924 {"grpjquota",.arg_required =
925 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
926 {"jqfmt",.arg_required = 'f',.values = NULL},
927 {.option_name = NULL}
928 };
929
930 *blocks = 0;
931 if (!options || !*options)
932 /* use default configuration: create tails, journaling on, no
933 conversion to newest format */
934 return 1;
935
936 for (pos = options; pos;) {
937 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
938 if (c == -1)
939 /* wrong option is given */
940 return 0;
941
942 if (c == 'r') {
943 char *p;
944
945 p = NULL;
946 /* "resize=NNN" or "resize=auto" */
947
948 if (!strcmp(arg, "auto")) {
949 /* From JFS code, to auto-get the size. */
950 *blocks =
951 s->s_bdev->bd_inode->i_size >> s->
952 s_blocksize_bits;
953 } else {
954 *blocks = simple_strtoul(arg, &p, 0);
955 if (*p != '\0') {
956 /* NNN does not look like a number */
957 reiserfs_warning(s, "super-6507",
958 "bad value %s for "
959 "-oresize\n", arg);
960 return 0;
961 }
962 }
963 }
964
965 if (c == 'c') {
966 char *p = NULL;
967 unsigned long val = simple_strtoul(arg, &p, 0);
968 /* commit=NNN (time in seconds) */
969 if (*p != '\0' || val >= (unsigned int)-1) {
970 reiserfs_warning(s, "super-6508",
971 "bad value %s for -ocommit\n",
972 arg);
973 return 0;
974 }
975 *commit_max_age = (unsigned int)val;
976 }
977
978 if (c == 'w') {
979 reiserfs_warning(s, "super-6509", "nolargeio option "
980 "is no longer supported");
981 return 0;
982 }
983
984 if (c == 'j') {
985 if (arg && *arg && jdev_name) {
986 if (*jdev_name) { //Hm, already assigned?
987 reiserfs_warning(s, "super-6510",
988 "journal device was "
989 "already specified to "
990 "be %s", *jdev_name);
991 return 0;
992 }
993 *jdev_name = arg;
994 }
995 }
996 #ifdef CONFIG_QUOTA
997 if (c == 'u' || c == 'g') {
998 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
999
1000 if (sb_any_quota_loaded(s) &&
1001 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1002 reiserfs_warning(s, "super-6511",
1003 "cannot change journaled "
1004 "quota options when quota "
1005 "turned on.");
1006 return 0;
1007 }
1008 if (*arg) { /* Some filename specified? */
1009 if (REISERFS_SB(s)->s_qf_names[qtype]
1010 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1011 arg)) {
1012 reiserfs_warning(s, "super-6512",
1013 "%s quota file "
1014 "already specified.",
1015 QTYPE2NAME(qtype));
1016 return 0;
1017 }
1018 if (strchr(arg, '/')) {
1019 reiserfs_warning(s, "super-6513",
1020 "quotafile must be "
1021 "on filesystem root.");
1022 return 0;
1023 }
1024 qf_names[qtype] =
1025 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1026 if (!qf_names[qtype]) {
1027 reiserfs_warning(s, "reiserfs-2502",
1028 "not enough memory "
1029 "for storing "
1030 "quotafile name.");
1031 return 0;
1032 }
1033 strcpy(qf_names[qtype], arg);
1034 *mount_options |= 1 << REISERFS_QUOTA;
1035 } else {
1036 if (qf_names[qtype] !=
1037 REISERFS_SB(s)->s_qf_names[qtype])
1038 kfree(qf_names[qtype]);
1039 qf_names[qtype] = NULL;
1040 }
1041 }
1042 if (c == 'f') {
1043 if (!strcmp(arg, "vfsold"))
1044 *qfmt = QFMT_VFS_OLD;
1045 else if (!strcmp(arg, "vfsv0"))
1046 *qfmt = QFMT_VFS_V0;
1047 else {
1048 reiserfs_warning(s, "super-6514",
1049 "unknown quota format "
1050 "specified.");
1051 return 0;
1052 }
1053 if (sb_any_quota_loaded(s) &&
1054 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1055 reiserfs_warning(s, "super-6515",
1056 "cannot change journaled "
1057 "quota options when quota "
1058 "turned on.");
1059 return 0;
1060 }
1061 }
1062 #else
1063 if (c == 'u' || c == 'g' || c == 'f') {
1064 reiserfs_warning(s, "reiserfs-2503", "journaled "
1065 "quota options not supported.");
1066 return 0;
1067 }
1068 #endif
1069 }
1070
1071 #ifdef CONFIG_QUOTA
1072 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1073 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1074 reiserfs_warning(s, "super-6515",
1075 "journaled quota format not specified.");
1076 return 0;
1077 }
1078 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1079 if (!(*mount_options & (1 << REISERFS_QUOTA))
1080 && sb_any_quota_loaded(s)) {
1081 reiserfs_warning(s, "super-6516", "quota options must "
1082 "be present when quota is turned on.");
1083 return 0;
1084 }
1085 #endif
1086
1087 return 1;
1088 }
1089
1090 static void switch_data_mode(struct super_block *s, unsigned long mode)
1091 {
1092 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1093 (1 << REISERFS_DATA_ORDERED) |
1094 (1 << REISERFS_DATA_WRITEBACK));
1095 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1096 }
1097
1098 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1099 {
1100 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1101 if (!reiserfs_data_log(s)) {
1102 switch_data_mode(s, REISERFS_DATA_LOG);
1103 reiserfs_info(s, "switching to journaled data mode\n");
1104 }
1105 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1106 if (!reiserfs_data_ordered(s)) {
1107 switch_data_mode(s, REISERFS_DATA_ORDERED);
1108 reiserfs_info(s, "switching to ordered data mode\n");
1109 }
1110 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1111 if (!reiserfs_data_writeback(s)) {
1112 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1113 reiserfs_info(s, "switching to writeback data mode\n");
1114 }
1115 }
1116 }
1117
1118 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1119 {
1120 int flush = (1 << REISERFS_BARRIER_FLUSH);
1121 int none = (1 << REISERFS_BARRIER_NONE);
1122 int all_barrier = flush | none;
1123
1124 if (bits & all_barrier) {
1125 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1126 if (bits & flush) {
1127 REISERFS_SB(s)->s_mount_opt |= flush;
1128 printk("reiserfs: enabling write barrier flush mode\n");
1129 } else if (bits & none) {
1130 REISERFS_SB(s)->s_mount_opt |= none;
1131 printk("reiserfs: write barriers turned off\n");
1132 }
1133 }
1134 }
1135
1136 static void handle_attrs(struct super_block *s)
1137 {
1138 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1139
1140 if (reiserfs_attrs(s)) {
1141 if (old_format_only(s)) {
1142 reiserfs_warning(s, "super-6517", "cannot support "
1143 "attributes on 3.5.x disk format");
1144 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1145 return;
1146 }
1147 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1148 reiserfs_warning(s, "super-6518", "cannot support "
1149 "attributes until flag is set in "
1150 "super-block");
1151 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1152 }
1153 }
1154 }
1155
1156 #ifdef CONFIG_QUOTA
1157 static void handle_quota_files(struct super_block *s, char **qf_names,
1158 unsigned int *qfmt)
1159 {
1160 int i;
1161
1162 for (i = 0; i < MAXQUOTAS; i++) {
1163 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1164 kfree(REISERFS_SB(s)->s_qf_names[i]);
1165 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1166 }
1167 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1168 }
1169 #endif
1170
1171 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1172 {
1173 struct reiserfs_super_block *rs;
1174 struct reiserfs_transaction_handle th;
1175 unsigned long blocks;
1176 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1177 unsigned long safe_mask = 0;
1178 unsigned int commit_max_age = (unsigned int)-1;
1179 struct reiserfs_journal *journal = SB_JOURNAL(s);
1180 char *new_opts = kstrdup(arg, GFP_KERNEL);
1181 int err;
1182 char *qf_names[MAXQUOTAS];
1183 unsigned int qfmt = 0;
1184 #ifdef CONFIG_QUOTA
1185 int i;
1186 #endif
1187
1188 reiserfs_write_lock(s);
1189
1190 #ifdef CONFIG_QUOTA
1191 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1192 #endif
1193
1194 rs = SB_DISK_SUPER_BLOCK(s);
1195
1196 if (!reiserfs_parse_options
1197 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1198 qf_names, &qfmt)) {
1199 #ifdef CONFIG_QUOTA
1200 for (i = 0; i < MAXQUOTAS; i++)
1201 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1202 kfree(qf_names[i]);
1203 #endif
1204 err = -EINVAL;
1205 goto out_err;
1206 }
1207 #ifdef CONFIG_QUOTA
1208 handle_quota_files(s, qf_names, &qfmt);
1209 #endif
1210
1211 handle_attrs(s);
1212
1213 /* Add options that are safe here */
1214 safe_mask |= 1 << REISERFS_SMALLTAIL;
1215 safe_mask |= 1 << REISERFS_LARGETAIL;
1216 safe_mask |= 1 << REISERFS_NO_BORDER;
1217 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1218 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1219 safe_mask |= 1 << REISERFS_TEST4;
1220 safe_mask |= 1 << REISERFS_ATTRS;
1221 safe_mask |= 1 << REISERFS_XATTRS_USER;
1222 safe_mask |= 1 << REISERFS_POSIXACL;
1223 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1224 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1225 safe_mask |= 1 << REISERFS_ERROR_RO;
1226 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1227 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1228 safe_mask |= 1 << REISERFS_QUOTA;
1229
1230 /* Update the bitmask, taking care to keep
1231 * the bits we're not allowed to change here */
1232 REISERFS_SB(s)->s_mount_opt =
1233 (REISERFS_SB(s)->
1234 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1235
1236 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1237 journal->j_max_commit_age = commit_max_age;
1238 journal->j_max_trans_age = commit_max_age;
1239 } else if (commit_max_age == 0) {
1240 /* 0 means restore defaults. */
1241 journal->j_max_commit_age = journal->j_default_max_commit_age;
1242 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1243 }
1244
1245 if (blocks) {
1246 err = reiserfs_resize(s, blocks);
1247 if (err != 0)
1248 goto out_err;
1249 }
1250
1251 if (*mount_flags & MS_RDONLY) {
1252 reiserfs_xattr_init(s, *mount_flags);
1253 /* remount read-only */
1254 if (s->s_flags & MS_RDONLY)
1255 /* it is read-only already */
1256 goto out_ok;
1257
1258 err = dquot_suspend(s, -1);
1259 if (err < 0)
1260 goto out_err;
1261
1262 /* try to remount file system with read-only permissions */
1263 if (sb_umount_state(rs) == REISERFS_VALID_FS
1264 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1265 goto out_ok;
1266 }
1267
1268 err = journal_begin(&th, s, 10);
1269 if (err)
1270 goto out_err;
1271
1272 /* Mounting a rw partition read-only. */
1273 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1274 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1275 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1276 } else {
1277 /* remount read-write */
1278 if (!(s->s_flags & MS_RDONLY)) {
1279 reiserfs_xattr_init(s, *mount_flags);
1280 goto out_ok; /* We are read-write already */
1281 }
1282
1283 if (reiserfs_is_journal_aborted(journal)) {
1284 err = journal->j_errno;
1285 goto out_err;
1286 }
1287
1288 handle_data_mode(s, mount_options);
1289 handle_barrier_mode(s, mount_options);
1290 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1291 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1292 err = journal_begin(&th, s, 10);
1293 if (err)
1294 goto out_err;
1295
1296 /* Mount a partition which is read-only, read-write */
1297 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1298 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1299 s->s_flags &= ~MS_RDONLY;
1300 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1301 if (!old_format_only(s))
1302 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1303 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1304 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1305 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1306 }
1307 /* this will force a full flush of all journal lists */
1308 SB_JOURNAL(s)->j_must_wait = 1;
1309 err = journal_end(&th, s, 10);
1310 if (err)
1311 goto out_err;
1312 s->s_dirt = 0;
1313
1314 if (!(*mount_flags & MS_RDONLY)) {
1315 dquot_resume(s, -1);
1316 finish_unfinished(s);
1317 reiserfs_xattr_init(s, *mount_flags);
1318 }
1319
1320 out_ok:
1321 replace_mount_options(s, new_opts);
1322 reiserfs_write_unlock(s);
1323 return 0;
1324
1325 out_err:
1326 kfree(new_opts);
1327 reiserfs_write_unlock(s);
1328 return err;
1329 }
1330
1331 static int read_super_block(struct super_block *s, int offset)
1332 {
1333 struct buffer_head *bh;
1334 struct reiserfs_super_block *rs;
1335 int fs_blocksize;
1336
1337 bh = sb_bread(s, offset / s->s_blocksize);
1338 if (!bh) {
1339 reiserfs_warning(s, "sh-2006",
1340 "bread failed (dev %s, block %lu, size %lu)",
1341 reiserfs_bdevname(s), offset / s->s_blocksize,
1342 s->s_blocksize);
1343 return 1;
1344 }
1345
1346 rs = (struct reiserfs_super_block *)bh->b_data;
1347 if (!is_any_reiserfs_magic_string(rs)) {
1348 brelse(bh);
1349 return 1;
1350 }
1351 //
1352 // ok, reiserfs signature (old or new) found in at the given offset
1353 //
1354 fs_blocksize = sb_blocksize(rs);
1355 brelse(bh);
1356 sb_set_blocksize(s, fs_blocksize);
1357
1358 bh = sb_bread(s, offset / s->s_blocksize);
1359 if (!bh) {
1360 reiserfs_warning(s, "sh-2007",
1361 "bread failed (dev %s, block %lu, size %lu)",
1362 reiserfs_bdevname(s), offset / s->s_blocksize,
1363 s->s_blocksize);
1364 return 1;
1365 }
1366
1367 rs = (struct reiserfs_super_block *)bh->b_data;
1368 if (sb_blocksize(rs) != s->s_blocksize) {
1369 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1370 "filesystem on (dev %s, block %Lu, size %lu)",
1371 reiserfs_bdevname(s),
1372 (unsigned long long)bh->b_blocknr,
1373 s->s_blocksize);
1374 brelse(bh);
1375 return 1;
1376 }
1377
1378 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1379 brelse(bh);
1380 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1381 "--rebuild-tree run detected. Please run\n"
1382 "reiserfsck --rebuild-tree and wait for a "
1383 "completion. If that fails\n"
1384 "get newer reiserfsprogs package");
1385 return 1;
1386 }
1387
1388 SB_BUFFER_WITH_SB(s) = bh;
1389 SB_DISK_SUPER_BLOCK(s) = rs;
1390
1391 if (is_reiserfs_jr(rs)) {
1392 /* magic is of non-standard journal filesystem, look at s_version to
1393 find which format is in use */
1394 if (sb_version(rs) == REISERFS_VERSION_2)
1395 reiserfs_info(s, "found reiserfs format \"3.6\""
1396 " with non-standard journal\n");
1397 else if (sb_version(rs) == REISERFS_VERSION_1)
1398 reiserfs_info(s, "found reiserfs format \"3.5\""
1399 " with non-standard journal\n");
1400 else {
1401 reiserfs_warning(s, "sh-2012", "found unknown "
1402 "format \"%u\" of reiserfs with "
1403 "non-standard magic", sb_version(rs));
1404 return 1;
1405 }
1406 } else
1407 /* s_version of standard format may contain incorrect information,
1408 so we just look at the magic string */
1409 reiserfs_info(s,
1410 "found reiserfs format \"%s\" with standard journal\n",
1411 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1412
1413 s->s_op = &reiserfs_sops;
1414 s->s_export_op = &reiserfs_export_ops;
1415 #ifdef CONFIG_QUOTA
1416 s->s_qcop = &reiserfs_qctl_operations;
1417 s->dq_op = &reiserfs_quota_operations;
1418 #endif
1419
1420 /* new format is limited by the 32 bit wide i_blocks field, want to
1421 ** be one full block below that.
1422 */
1423 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1424 return 0;
1425 }
1426
1427 /* after journal replay, reread all bitmap and super blocks */
1428 static int reread_meta_blocks(struct super_block *s)
1429 {
1430 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1431 reiserfs_write_unlock(s);
1432 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1433 reiserfs_write_lock(s);
1434 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1435 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1436 return 1;
1437 }
1438
1439 return 0;
1440 }
1441
1442 /////////////////////////////////////////////////////
1443 // hash detection stuff
1444
1445 // if root directory is empty - we set default - Yura's - hash and
1446 // warn about it
1447 // FIXME: we look for only one name in a directory. If tea and yura
1448 // bith have the same value - we ask user to send report to the
1449 // mailing list
1450 static __u32 find_hash_out(struct super_block *s)
1451 {
1452 int retval;
1453 struct inode *inode;
1454 struct cpu_key key;
1455 INITIALIZE_PATH(path);
1456 struct reiserfs_dir_entry de;
1457 __u32 hash = DEFAULT_HASH;
1458
1459 inode = s->s_root->d_inode;
1460
1461 do { // Some serious "goto"-hater was there ;)
1462 u32 teahash, r5hash, yurahash;
1463
1464 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1465 retval = search_by_entry_key(s, &key, &path, &de);
1466 if (retval == IO_ERROR) {
1467 pathrelse(&path);
1468 return UNSET_HASH;
1469 }
1470 if (retval == NAME_NOT_FOUND)
1471 de.de_entry_num--;
1472 set_de_name_and_namelen(&de);
1473 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1474 /* allow override in this case */
1475 if (reiserfs_rupasov_hash(s)) {
1476 hash = YURA_HASH;
1477 }
1478 reiserfs_info(s, "FS seems to be empty, autodetect "
1479 "is using the default hash\n");
1480 break;
1481 }
1482 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1483 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1484 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1485 if (((teahash == r5hash)
1486 &&
1487 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1488 == r5hash)) || ((teahash == yurahash)
1489 && (yurahash ==
1490 GET_HASH_VALUE(deh_offset
1491 (&
1492 (de.
1493 de_deh[de.
1494 de_entry_num])))))
1495 || ((r5hash == yurahash)
1496 && (yurahash ==
1497 GET_HASH_VALUE(deh_offset
1498 (&(de.de_deh[de.de_entry_num])))))) {
1499 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1500 "automatically detect hash function. "
1501 "Please mount with -o "
1502 "hash={tea,rupasov,r5}");
1503 hash = UNSET_HASH;
1504 break;
1505 }
1506 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1507 yurahash)
1508 hash = YURA_HASH;
1509 else if (GET_HASH_VALUE
1510 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1511 hash = TEA_HASH;
1512 else if (GET_HASH_VALUE
1513 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1514 hash = R5_HASH;
1515 else {
1516 reiserfs_warning(s, "reiserfs-2506",
1517 "Unrecognised hash function");
1518 hash = UNSET_HASH;
1519 }
1520 } while (0);
1521
1522 pathrelse(&path);
1523 return hash;
1524 }
1525
1526 // finds out which hash names are sorted with
1527 static int what_hash(struct super_block *s)
1528 {
1529 __u32 code;
1530
1531 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1532
1533 /* reiserfs_hash_detect() == true if any of the hash mount options
1534 ** were used. We must check them to make sure the user isn't
1535 ** using a bad hash value
1536 */
1537 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1538 code = find_hash_out(s);
1539
1540 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1541 /* detection has found the hash, and we must check against the
1542 ** mount options
1543 */
1544 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1545 reiserfs_warning(s, "reiserfs-2507",
1546 "Error, %s hash detected, "
1547 "unable to force rupasov hash",
1548 reiserfs_hashname(code));
1549 code = UNSET_HASH;
1550 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1551 reiserfs_warning(s, "reiserfs-2508",
1552 "Error, %s hash detected, "
1553 "unable to force tea hash",
1554 reiserfs_hashname(code));
1555 code = UNSET_HASH;
1556 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1557 reiserfs_warning(s, "reiserfs-2509",
1558 "Error, %s hash detected, "
1559 "unable to force r5 hash",
1560 reiserfs_hashname(code));
1561 code = UNSET_HASH;
1562 }
1563 } else {
1564 /* find_hash_out was not called or could not determine the hash */
1565 if (reiserfs_rupasov_hash(s)) {
1566 code = YURA_HASH;
1567 } else if (reiserfs_tea_hash(s)) {
1568 code = TEA_HASH;
1569 } else if (reiserfs_r5_hash(s)) {
1570 code = R5_HASH;
1571 }
1572 }
1573
1574 /* if we are mounted RW, and we have a new valid hash code, update
1575 ** the super
1576 */
1577 if (code != UNSET_HASH &&
1578 !(s->s_flags & MS_RDONLY) &&
1579 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1580 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1581 }
1582 return code;
1583 }
1584
1585 // return pointer to appropriate function
1586 static hashf_t hash_function(struct super_block *s)
1587 {
1588 switch (what_hash(s)) {
1589 case TEA_HASH:
1590 reiserfs_info(s, "Using tea hash to sort names\n");
1591 return keyed_hash;
1592 case YURA_HASH:
1593 reiserfs_info(s, "Using rupasov hash to sort names\n");
1594 return yura_hash;
1595 case R5_HASH:
1596 reiserfs_info(s, "Using r5 hash to sort names\n");
1597 return r5_hash;
1598 }
1599 return NULL;
1600 }
1601
1602 // this is used to set up correct value for old partitions
1603 static int function2code(hashf_t func)
1604 {
1605 if (func == keyed_hash)
1606 return TEA_HASH;
1607 if (func == yura_hash)
1608 return YURA_HASH;
1609 if (func == r5_hash)
1610 return R5_HASH;
1611
1612 BUG(); // should never happen
1613
1614 return 0;
1615 }
1616
1617 #define SWARN(silent, s, id, ...) \
1618 if (!(silent)) \
1619 reiserfs_warning(s, id, __VA_ARGS__)
1620
1621 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1622 {
1623 struct inode *root_inode;
1624 struct reiserfs_transaction_handle th;
1625 int old_format = 0;
1626 unsigned long blocks;
1627 unsigned int commit_max_age = 0;
1628 int jinit_done = 0;
1629 struct reiserfs_iget_args args;
1630 struct reiserfs_super_block *rs;
1631 char *jdev_name;
1632 struct reiserfs_sb_info *sbi;
1633 int errval = -EINVAL;
1634 char *qf_names[MAXQUOTAS] = {};
1635 unsigned int qfmt = 0;
1636
1637 save_mount_options(s, data);
1638
1639 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1640 if (!sbi)
1641 return -ENOMEM;
1642 s->s_fs_info = sbi;
1643 /* Set default values for options: non-aggressive tails, RO on errors */
1644 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1645 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1646 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1647 /* no preallocation minimum, be smart in
1648 reiserfs_file_write instead */
1649 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1650 /* Preallocate by 16 blocks (17-1) at once */
1651 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1652 /* setup default block allocator options */
1653 reiserfs_init_alloc_options(s);
1654
1655 mutex_init(&REISERFS_SB(s)->lock);
1656 REISERFS_SB(s)->lock_depth = -1;
1657
1658 /*
1659 * This function is called with the bkl, which also was the old
1660 * locking used here.
1661 * do_journal_begin() will soon check if we hold the lock (ie: was the
1662 * bkl). This is likely because do_journal_begin() has several another
1663 * callers because at this time, it doesn't seem to be necessary to
1664 * protect against anything.
1665 * Anyway, let's be conservative and lock for now.
1666 */
1667 reiserfs_write_lock(s);
1668
1669 jdev_name = NULL;
1670 if (reiserfs_parse_options
1671 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1672 &commit_max_age, qf_names, &qfmt) == 0) {
1673 goto error;
1674 }
1675 #ifdef CONFIG_QUOTA
1676 handle_quota_files(s, qf_names, &qfmt);
1677 #endif
1678
1679 if (blocks) {
1680 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1681 goto error;
1682 }
1683
1684 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1685 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1686 old_format = 1;
1687 /* try new format (64-th 1k block), which can contain reiserfs super block */
1688 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1689 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1690 reiserfs_bdevname(s));
1691 goto error;
1692 }
1693
1694 rs = SB_DISK_SUPER_BLOCK(s);
1695 /* Let's do basic sanity check to verify that underlying device is not
1696 smaller than the filesystem. If the check fails then abort and scream,
1697 because bad stuff will happen otherwise. */
1698 if (s->s_bdev && s->s_bdev->bd_inode
1699 && i_size_read(s->s_bdev->bd_inode) <
1700 sb_block_count(rs) * sb_blocksize(rs)) {
1701 SWARN(silent, s, "", "Filesystem cannot be "
1702 "mounted because it is bigger than the device");
1703 SWARN(silent, s, "", "You may need to run fsck "
1704 "or increase size of your LVM partition");
1705 SWARN(silent, s, "", "Or may be you forgot to "
1706 "reboot after fdisk when it told you to");
1707 goto error;
1708 }
1709
1710 sbi->s_mount_state = SB_REISERFS_STATE(s);
1711 sbi->s_mount_state = REISERFS_VALID_FS;
1712
1713 if ((errval = reiserfs_init_bitmap_cache(s))) {
1714 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1715 goto error;
1716 }
1717 errval = -EINVAL;
1718 #ifdef CONFIG_REISERFS_CHECK
1719 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1720 SWARN(silent, s, "", "- it is slow mode for debugging.");
1721 #endif
1722
1723 /* make data=ordered the default */
1724 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1725 !reiserfs_data_writeback(s)) {
1726 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1727 }
1728
1729 if (reiserfs_data_log(s)) {
1730 reiserfs_info(s, "using journaled data mode\n");
1731 } else if (reiserfs_data_ordered(s)) {
1732 reiserfs_info(s, "using ordered data mode\n");
1733 } else {
1734 reiserfs_info(s, "using writeback data mode\n");
1735 }
1736 if (reiserfs_barrier_flush(s)) {
1737 printk("reiserfs: using flush barriers\n");
1738 }
1739 // set_device_ro(s->s_dev, 1) ;
1740 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1741 SWARN(silent, s, "sh-2022",
1742 "unable to initialize journal space");
1743 goto error;
1744 } else {
1745 jinit_done = 1; /* once this is set, journal_release must be called
1746 ** if we error out of the mount
1747 */
1748 }
1749 if (reread_meta_blocks(s)) {
1750 SWARN(silent, s, "jmacd-9",
1751 "unable to reread meta blocks after journal init");
1752 goto error;
1753 }
1754
1755 if (replay_only(s))
1756 goto error;
1757
1758 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1759 SWARN(silent, s, "clm-7000",
1760 "Detected readonly device, marking FS readonly");
1761 s->s_flags |= MS_RDONLY;
1762 }
1763 args.objectid = REISERFS_ROOT_OBJECTID;
1764 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1765 root_inode =
1766 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1767 reiserfs_init_locked_inode, (void *)(&args));
1768 if (!root_inode) {
1769 SWARN(silent, s, "jmacd-10", "get root inode failed");
1770 goto error;
1771 }
1772
1773 if (root_inode->i_state & I_NEW) {
1774 reiserfs_read_locked_inode(root_inode, &args);
1775 unlock_new_inode(root_inode);
1776 }
1777
1778 s->s_root = d_alloc_root(root_inode);
1779 if (!s->s_root) {
1780 iput(root_inode);
1781 goto error;
1782 }
1783 // define and initialize hash function
1784 sbi->s_hash_function = hash_function(s);
1785 if (sbi->s_hash_function == NULL) {
1786 dput(s->s_root);
1787 s->s_root = NULL;
1788 goto error;
1789 }
1790
1791 if (is_reiserfs_3_5(rs)
1792 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1793 set_bit(REISERFS_3_5, &(sbi->s_properties));
1794 else if (old_format)
1795 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1796 else
1797 set_bit(REISERFS_3_6, &(sbi->s_properties));
1798
1799 if (!(s->s_flags & MS_RDONLY)) {
1800
1801 errval = journal_begin(&th, s, 1);
1802 if (errval) {
1803 dput(s->s_root);
1804 s->s_root = NULL;
1805 goto error;
1806 }
1807 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1808
1809 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1810 set_sb_fs_state(rs, 0);
1811
1812 /* Clear out s_bmap_nr if it would wrap. We can handle this
1813 * case, but older revisions can't. This will cause the
1814 * file system to fail mount on those older implementations,
1815 * avoiding corruption. -jeffm */
1816 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1817 sb_bmap_nr(rs) != 0) {
1818 reiserfs_warning(s, "super-2030", "This file system "
1819 "claims to use %u bitmap blocks in "
1820 "its super block, but requires %u. "
1821 "Clearing to zero.", sb_bmap_nr(rs),
1822 reiserfs_bmap_count(s));
1823
1824 set_sb_bmap_nr(rs, 0);
1825 }
1826
1827 if (old_format_only(s)) {
1828 /* filesystem of format 3.5 either with standard or non-standard
1829 journal */
1830 if (convert_reiserfs(s)) {
1831 /* and -o conv is given */
1832 if (!silent)
1833 reiserfs_info(s,
1834 "converting 3.5 filesystem to the 3.6 format");
1835
1836 if (is_reiserfs_3_5(rs))
1837 /* put magic string of 3.6 format. 2.2 will not be able to
1838 mount this filesystem anymore */
1839 memcpy(rs->s_v1.s_magic,
1840 reiserfs_3_6_magic_string,
1841 sizeof
1842 (reiserfs_3_6_magic_string));
1843
1844 set_sb_version(rs, REISERFS_VERSION_2);
1845 reiserfs_convert_objectid_map_v1(s);
1846 set_bit(REISERFS_3_6, &(sbi->s_properties));
1847 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1848 } else if (!silent) {
1849 reiserfs_info(s, "using 3.5.x disk format\n");
1850 }
1851 } else
1852 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1853
1854
1855 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1856 errval = journal_end(&th, s, 1);
1857 if (errval) {
1858 dput(s->s_root);
1859 s->s_root = NULL;
1860 goto error;
1861 }
1862
1863 if ((errval = reiserfs_lookup_privroot(s)) ||
1864 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1865 dput(s->s_root);
1866 s->s_root = NULL;
1867 goto error;
1868 }
1869
1870 /* look for files which were to be removed in previous session */
1871 finish_unfinished(s);
1872 } else {
1873 if (old_format_only(s) && !silent) {
1874 reiserfs_info(s, "using 3.5.x disk format\n");
1875 }
1876
1877 if ((errval = reiserfs_lookup_privroot(s)) ||
1878 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1879 dput(s->s_root);
1880 s->s_root = NULL;
1881 goto error;
1882 }
1883 }
1884 // mark hash in super block: it could be unset. overwrite should be ok
1885 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1886
1887 handle_attrs(s);
1888
1889 reiserfs_proc_info_init(s);
1890
1891 init_waitqueue_head(&(sbi->s_wait));
1892 spin_lock_init(&sbi->bitmap_lock);
1893
1894 reiserfs_write_unlock(s);
1895
1896 return (0);
1897
1898 error:
1899 if (jinit_done) { /* kill the commit thread, free journal ram */
1900 journal_release_error(NULL, s);
1901 }
1902
1903 reiserfs_write_unlock(s);
1904
1905 reiserfs_free_bitmap_cache(s);
1906 if (SB_BUFFER_WITH_SB(s))
1907 brelse(SB_BUFFER_WITH_SB(s));
1908 #ifdef CONFIG_QUOTA
1909 {
1910 int j;
1911 for (j = 0; j < MAXQUOTAS; j++)
1912 kfree(qf_names[j]);
1913 }
1914 #endif
1915 kfree(sbi);
1916
1917 s->s_fs_info = NULL;
1918 return errval;
1919 }
1920
1921 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1922 {
1923 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1924
1925 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1926 buf->f_bfree = sb_free_blocks(rs);
1927 buf->f_bavail = buf->f_bfree;
1928 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1929 buf->f_bsize = dentry->d_sb->s_blocksize;
1930 /* changed to accommodate gcc folks. */
1931 buf->f_type = REISERFS_SUPER_MAGIC;
1932 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1933 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1934 sizeof(rs->s_uuid)/2);
1935
1936 return 0;
1937 }
1938
1939 #ifdef CONFIG_QUOTA
1940 static int reiserfs_write_dquot(struct dquot *dquot)
1941 {
1942 struct reiserfs_transaction_handle th;
1943 int ret, err;
1944
1945 reiserfs_write_lock(dquot->dq_sb);
1946 ret =
1947 journal_begin(&th, dquot->dq_sb,
1948 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1949 if (ret)
1950 goto out;
1951 ret = dquot_commit(dquot);
1952 err =
1953 journal_end(&th, dquot->dq_sb,
1954 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1955 if (!ret && err)
1956 ret = err;
1957 out:
1958 reiserfs_write_unlock(dquot->dq_sb);
1959 return ret;
1960 }
1961
1962 static int reiserfs_acquire_dquot(struct dquot *dquot)
1963 {
1964 struct reiserfs_transaction_handle th;
1965 int ret, err;
1966
1967 reiserfs_write_lock(dquot->dq_sb);
1968 ret =
1969 journal_begin(&th, dquot->dq_sb,
1970 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1971 if (ret)
1972 goto out;
1973 ret = dquot_acquire(dquot);
1974 err =
1975 journal_end(&th, dquot->dq_sb,
1976 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1977 if (!ret && err)
1978 ret = err;
1979 out:
1980 reiserfs_write_unlock(dquot->dq_sb);
1981 return ret;
1982 }
1983
1984 static int reiserfs_release_dquot(struct dquot *dquot)
1985 {
1986 struct reiserfs_transaction_handle th;
1987 int ret, err;
1988
1989 reiserfs_write_lock(dquot->dq_sb);
1990 ret =
1991 journal_begin(&th, dquot->dq_sb,
1992 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1993 if (ret) {
1994 /* Release dquot anyway to avoid endless cycle in dqput() */
1995 dquot_release(dquot);
1996 goto out;
1997 }
1998 ret = dquot_release(dquot);
1999 err =
2000 journal_end(&th, dquot->dq_sb,
2001 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2002 if (!ret && err)
2003 ret = err;
2004 out:
2005 reiserfs_write_unlock(dquot->dq_sb);
2006 return ret;
2007 }
2008
2009 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2010 {
2011 /* Are we journaling quotas? */
2012 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2013 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2014 dquot_mark_dquot_dirty(dquot);
2015 return reiserfs_write_dquot(dquot);
2016 } else
2017 return dquot_mark_dquot_dirty(dquot);
2018 }
2019
2020 static int reiserfs_write_info(struct super_block *sb, int type)
2021 {
2022 struct reiserfs_transaction_handle th;
2023 int ret, err;
2024
2025 /* Data block + inode block */
2026 reiserfs_write_lock(sb);
2027 ret = journal_begin(&th, sb, 2);
2028 if (ret)
2029 goto out;
2030 ret = dquot_commit_info(sb, type);
2031 err = journal_end(&th, sb, 2);
2032 if (!ret && err)
2033 ret = err;
2034 out:
2035 reiserfs_write_unlock(sb);
2036 return ret;
2037 }
2038
2039 /*
2040 * Turn on quotas during mount time - we need to find the quota file and such...
2041 */
2042 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2043 {
2044 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2045 REISERFS_SB(sb)->s_jquota_fmt, type);
2046 }
2047
2048 /*
2049 * Standard function to be called on quota_on
2050 */
2051 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2052 struct path *path)
2053 {
2054 int err;
2055 struct inode *inode;
2056 struct reiserfs_transaction_handle th;
2057
2058 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2059 return -EINVAL;
2060
2061 /* Quotafile not on the same filesystem? */
2062 if (path->mnt->mnt_sb != sb) {
2063 err = -EXDEV;
2064 goto out;
2065 }
2066 inode = path->dentry->d_inode;
2067 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2068 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2069 err = reiserfs_unpack(inode, NULL);
2070 if (err) {
2071 reiserfs_warning(sb, "super-6520",
2072 "Unpacking tail of quota file failed"
2073 " (%d). Cannot turn on quotas.", err);
2074 err = -EINVAL;
2075 goto out;
2076 }
2077 mark_inode_dirty(inode);
2078 }
2079 /* Journaling quota? */
2080 if (REISERFS_SB(sb)->s_qf_names[type]) {
2081 /* Quotafile not of fs root? */
2082 if (path->dentry->d_parent != sb->s_root)
2083 reiserfs_warning(sb, "super-6521",
2084 "Quota file not on filesystem root. "
2085 "Journalled quota will not work.");
2086 }
2087
2088 /*
2089 * When we journal data on quota file, we have to flush journal to see
2090 * all updates to the file when we bypass pagecache...
2091 */
2092 if (reiserfs_file_data_log(inode)) {
2093 /* Just start temporary transaction and finish it */
2094 err = journal_begin(&th, sb, 1);
2095 if (err)
2096 goto out;
2097 err = journal_end_sync(&th, sb, 1);
2098 if (err)
2099 goto out;
2100 }
2101 err = dquot_quota_on(sb, type, format_id, path);
2102 out:
2103 return err;
2104 }
2105
2106 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2107 * acquiring the locks... As quota files are never truncated and quota code
2108 * itself serializes the operations (and no one else should touch the files)
2109 * we don't have to be afraid of races */
2110 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2111 size_t len, loff_t off)
2112 {
2113 struct inode *inode = sb_dqopt(sb)->files[type];
2114 unsigned long blk = off >> sb->s_blocksize_bits;
2115 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2116 size_t toread;
2117 struct buffer_head tmp_bh, *bh;
2118 loff_t i_size = i_size_read(inode);
2119
2120 if (off > i_size)
2121 return 0;
2122 if (off + len > i_size)
2123 len = i_size - off;
2124 toread = len;
2125 while (toread > 0) {
2126 tocopy =
2127 sb->s_blocksize - offset <
2128 toread ? sb->s_blocksize - offset : toread;
2129 tmp_bh.b_state = 0;
2130 /* Quota files are without tails so we can safely use this function */
2131 reiserfs_write_lock(sb);
2132 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2133 reiserfs_write_unlock(sb);
2134 if (err)
2135 return err;
2136 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2137 memset(data, 0, tocopy);
2138 else {
2139 bh = sb_bread(sb, tmp_bh.b_blocknr);
2140 if (!bh)
2141 return -EIO;
2142 memcpy(data, bh->b_data + offset, tocopy);
2143 brelse(bh);
2144 }
2145 offset = 0;
2146 toread -= tocopy;
2147 data += tocopy;
2148 blk++;
2149 }
2150 return len;
2151 }
2152
2153 /* Write to quotafile (we know the transaction is already started and has
2154 * enough credits) */
2155 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2156 const char *data, size_t len, loff_t off)
2157 {
2158 struct inode *inode = sb_dqopt(sb)->files[type];
2159 unsigned long blk = off >> sb->s_blocksize_bits;
2160 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2161 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2162 size_t towrite = len;
2163 struct buffer_head tmp_bh, *bh;
2164
2165 if (!current->journal_info) {
2166 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2167 " cancelled because transaction is not started.\n",
2168 (unsigned long long)off, (unsigned long long)len);
2169 return -EIO;
2170 }
2171 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2172 while (towrite > 0) {
2173 tocopy = sb->s_blocksize - offset < towrite ?
2174 sb->s_blocksize - offset : towrite;
2175 tmp_bh.b_state = 0;
2176 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2177 if (err)
2178 goto out;
2179 if (offset || tocopy != sb->s_blocksize)
2180 bh = sb_bread(sb, tmp_bh.b_blocknr);
2181 else
2182 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2183 if (!bh) {
2184 err = -EIO;
2185 goto out;
2186 }
2187 lock_buffer(bh);
2188 memcpy(bh->b_data + offset, data, tocopy);
2189 flush_dcache_page(bh->b_page);
2190 set_buffer_uptodate(bh);
2191 unlock_buffer(bh);
2192 reiserfs_prepare_for_journal(sb, bh, 1);
2193 journal_mark_dirty(current->journal_info, sb, bh);
2194 if (!journal_quota)
2195 reiserfs_add_ordered_list(inode, bh);
2196 brelse(bh);
2197 offset = 0;
2198 towrite -= tocopy;
2199 data += tocopy;
2200 blk++;
2201 }
2202 out:
2203 if (len == towrite) {
2204 mutex_unlock(&inode->i_mutex);
2205 return err;
2206 }
2207 if (inode->i_size < off + len - towrite)
2208 i_size_write(inode, off + len - towrite);
2209 inode->i_version++;
2210 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2211 mark_inode_dirty(inode);
2212 mutex_unlock(&inode->i_mutex);
2213 return len - towrite;
2214 }
2215
2216 #endif
2217
2218 static struct dentry *get_super_block(struct file_system_type *fs_type,
2219 int flags, const char *dev_name,
2220 void *data)
2221 {
2222 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2223 }
2224
2225 static int __init init_reiserfs_fs(void)
2226 {
2227 int ret;
2228
2229 if ((ret = init_inodecache())) {
2230 return ret;
2231 }
2232
2233 reiserfs_proc_info_global_init();
2234
2235 ret = register_filesystem(&reiserfs_fs_type);
2236
2237 if (ret == 0) {
2238 return 0;
2239 }
2240
2241 reiserfs_proc_info_global_done();
2242 destroy_inodecache();
2243
2244 return ret;
2245 }
2246
2247 static void __exit exit_reiserfs_fs(void)
2248 {
2249 reiserfs_proc_info_global_done();
2250 unregister_filesystem(&reiserfs_fs_type);
2251 destroy_inodecache();
2252 }
2253
2254 struct file_system_type reiserfs_fs_type = {
2255 .owner = THIS_MODULE,
2256 .name = "reiserfs",
2257 .mount = get_super_block,
2258 .kill_sb = reiserfs_kill_sb,
2259 .fs_flags = FS_REQUIRES_DEV,
2260 };
2261
2262 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2263 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2264 MODULE_LICENSE("GPL");
2265
2266 module_init(init_reiserfs_fs);
2267 module_exit(exit_reiserfs_fs);
Linux Btrfs Development