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vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob1abffa4515298fe2f493baabf5fe29c85fcbd0d5
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 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
536 }
537
538 static void reiserfs_destroy_inode(struct inode *inode)
539 {
540 call_rcu(&inode->i_rcu, reiserfs_i_callback);
541 }
542
543 static void init_once(void *foo)
544 {
545 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
546
547 INIT_LIST_HEAD(&ei->i_prealloc_list);
548 inode_init_once(&ei->vfs_inode);
549 }
550
551 static int init_inodecache(void)
552 {
553 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
554 sizeof(struct
555 reiserfs_inode_info),
556 0, (SLAB_RECLAIM_ACCOUNT|
557 SLAB_MEM_SPREAD),
558 init_once);
559 if (reiserfs_inode_cachep == NULL)
560 return -ENOMEM;
561 return 0;
562 }
563
564 static void destroy_inodecache(void)
565 {
566 kmem_cache_destroy(reiserfs_inode_cachep);
567 }
568
569 /* we don't mark inodes dirty, we just log them */
570 static void reiserfs_dirty_inode(struct inode *inode, int flags)
571 {
572 struct reiserfs_transaction_handle th;
573
574 int err = 0;
575 int lock_depth;
576
577 if (inode->i_sb->s_flags & MS_RDONLY) {
578 reiserfs_warning(inode->i_sb, "clm-6006",
579 "writing inode %lu on readonly FS",
580 inode->i_ino);
581 return;
582 }
583 lock_depth = reiserfs_write_lock_once(inode->i_sb);
584
585 /* this is really only used for atime updates, so they don't have
586 ** to be included in O_SYNC or fsync
587 */
588 err = journal_begin(&th, inode->i_sb, 1);
589 if (err)
590 goto out;
591
592 reiserfs_update_sd(&th, inode);
593 journal_end(&th, inode->i_sb, 1);
594
595 out:
596 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
597 }
598
599 #ifdef CONFIG_QUOTA
600 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
601 size_t, loff_t);
602 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
603 loff_t);
604 #endif
605
606 static const struct super_operations reiserfs_sops = {
607 .alloc_inode = reiserfs_alloc_inode,
608 .destroy_inode = reiserfs_destroy_inode,
609 .write_inode = reiserfs_write_inode,
610 .dirty_inode = reiserfs_dirty_inode,
611 .evict_inode = reiserfs_evict_inode,
612 .put_super = reiserfs_put_super,
613 .write_super = reiserfs_write_super,
614 .sync_fs = reiserfs_sync_fs,
615 .freeze_fs = reiserfs_freeze,
616 .unfreeze_fs = reiserfs_unfreeze,
617 .statfs = reiserfs_statfs,
618 .remount_fs = reiserfs_remount,
619 .show_options = generic_show_options,
620 #ifdef CONFIG_QUOTA
621 .quota_read = reiserfs_quota_read,
622 .quota_write = reiserfs_quota_write,
623 #endif
624 };
625
626 #ifdef CONFIG_QUOTA
627 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
628
629 static int reiserfs_write_dquot(struct dquot *);
630 static int reiserfs_acquire_dquot(struct dquot *);
631 static int reiserfs_release_dquot(struct dquot *);
632 static int reiserfs_mark_dquot_dirty(struct dquot *);
633 static int reiserfs_write_info(struct super_block *, int);
634 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
635
636 static const struct dquot_operations reiserfs_quota_operations = {
637 .write_dquot = reiserfs_write_dquot,
638 .acquire_dquot = reiserfs_acquire_dquot,
639 .release_dquot = reiserfs_release_dquot,
640 .mark_dirty = reiserfs_mark_dquot_dirty,
641 .write_info = reiserfs_write_info,
642 .alloc_dquot = dquot_alloc,
643 .destroy_dquot = dquot_destroy,
644 };
645
646 static const struct quotactl_ops reiserfs_qctl_operations = {
647 .quota_on = reiserfs_quota_on,
648 .quota_off = dquot_quota_off,
649 .quota_sync = dquot_quota_sync,
650 .get_info = dquot_get_dqinfo,
651 .set_info = dquot_set_dqinfo,
652 .get_dqblk = dquot_get_dqblk,
653 .set_dqblk = dquot_set_dqblk,
654 };
655 #endif
656
657 static const struct export_operations reiserfs_export_ops = {
658 .encode_fh = reiserfs_encode_fh,
659 .fh_to_dentry = reiserfs_fh_to_dentry,
660 .fh_to_parent = reiserfs_fh_to_parent,
661 .get_parent = reiserfs_get_parent,
662 };
663
664 /* this struct is used in reiserfs_getopt () for containing the value for those
665 mount options that have values rather than being toggles. */
666 typedef struct {
667 char *value;
668 int setmask; /* bitmask which is to set on mount_options bitmask when this
669 value is found, 0 is no bits are to be changed. */
670 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
671 value is found, 0 is no bits are to be changed. This is
672 applied BEFORE setmask */
673 } arg_desc_t;
674
675 /* Set this bit in arg_required to allow empty arguments */
676 #define REISERFS_OPT_ALLOWEMPTY 31
677
678 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
679 mount options */
680 typedef struct {
681 char *option_name;
682 int arg_required; /* 0 if argument is not required, not 0 otherwise */
683 const arg_desc_t *values; /* list of values accepted by an option */
684 int setmask; /* bitmask which is to set on mount_options bitmask when this
685 value is found, 0 is no bits are to be changed. */
686 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
687 value is found, 0 is no bits are to be changed. This is
688 applied BEFORE setmask */
689 } opt_desc_t;
690
691 /* possible values for -o data= */
692 static const arg_desc_t logging_mode[] = {
693 {"ordered", 1 << REISERFS_DATA_ORDERED,
694 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
695 {"journal", 1 << REISERFS_DATA_LOG,
696 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
697 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
698 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
699 {.value = NULL}
700 };
701
702 /* possible values for -o barrier= */
703 static const arg_desc_t barrier_mode[] = {
704 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
705 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
706 {.value = NULL}
707 };
708
709 /* possible values for "-o block-allocator=" and bits which are to be set in
710 s_mount_opt of reiserfs specific part of in-core super block */
711 static const arg_desc_t balloc[] = {
712 {"noborder", 1 << REISERFS_NO_BORDER, 0},
713 {"border", 0, 1 << REISERFS_NO_BORDER},
714 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
715 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
716 {"test4", 1 << REISERFS_TEST4, 0},
717 {"notest4", 0, 1 << REISERFS_TEST4},
718 {NULL, 0, 0}
719 };
720
721 static const arg_desc_t tails[] = {
722 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
723 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
724 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
725 {NULL, 0, 0}
726 };
727
728 static const arg_desc_t error_actions[] = {
729 {"panic", 1 << REISERFS_ERROR_PANIC,
730 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
731 {"ro-remount", 1 << REISERFS_ERROR_RO,
732 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
733 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
734 {"continue", 1 << REISERFS_ERROR_CONTINUE,
735 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
736 #endif
737 {NULL, 0, 0},
738 };
739
740 /* proceed only one option from a list *cur - string containing of mount options
741 opts - array of options which are accepted
742 opt_arg - if option is found and requires an argument and if it is specifed
743 in the input - pointer to the argument is stored here
744 bit_flags - if option requires to set a certain bit - it is set here
745 return -1 if unknown option is found, opt->arg_required otherwise */
746 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
747 char **opt_arg, unsigned long *bit_flags)
748 {
749 char *p;
750 /* foo=bar,
751 ^ ^ ^
752 | | +-- option_end
753 | +-- arg_start
754 +-- option_start
755 */
756 const opt_desc_t *opt;
757 const arg_desc_t *arg;
758
759 p = *cur;
760
761 /* assume argument cannot contain commas */
762 *cur = strchr(p, ',');
763 if (*cur) {
764 *(*cur) = '\0';
765 (*cur)++;
766 }
767
768 if (!strncmp(p, "alloc=", 6)) {
769 /* Ugly special case, probably we should redo options parser so that
770 it can understand several arguments for some options, also so that
771 it can fill several bitfields with option values. */
772 if (reiserfs_parse_alloc_options(s, p + 6)) {
773 return -1;
774 } else {
775 return 0;
776 }
777 }
778
779 /* for every option in the list */
780 for (opt = opts; opt->option_name; opt++) {
781 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
782 if (bit_flags) {
783 if (opt->clrmask ==
784 (1 << REISERFS_UNSUPPORTED_OPT))
785 reiserfs_warning(s, "super-6500",
786 "%s not supported.\n",
787 p);
788 else
789 *bit_flags &= ~opt->clrmask;
790 if (opt->setmask ==
791 (1 << REISERFS_UNSUPPORTED_OPT))
792 reiserfs_warning(s, "super-6501",
793 "%s not supported.\n",
794 p);
795 else
796 *bit_flags |= opt->setmask;
797 }
798 break;
799 }
800 }
801 if (!opt->option_name) {
802 reiserfs_warning(s, "super-6502",
803 "unknown mount option \"%s\"", p);
804 return -1;
805 }
806
807 p += strlen(opt->option_name);
808 switch (*p) {
809 case '=':
810 if (!opt->arg_required) {
811 reiserfs_warning(s, "super-6503",
812 "the option \"%s\" does not "
813 "require an argument\n",
814 opt->option_name);
815 return -1;
816 }
817 break;
818
819 case 0:
820 if (opt->arg_required) {
821 reiserfs_warning(s, "super-6504",
822 "the option \"%s\" requires an "
823 "argument\n", opt->option_name);
824 return -1;
825 }
826 break;
827 default:
828 reiserfs_warning(s, "super-6505",
829 "head of option \"%s\" is only correct\n",
830 opt->option_name);
831 return -1;
832 }
833
834 /* move to the argument, or to next option if argument is not required */
835 p++;
836
837 if (opt->arg_required
838 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
839 && !strlen(p)) {
840 /* this catches "option=," if not allowed */
841 reiserfs_warning(s, "super-6506",
842 "empty argument for \"%s\"\n",
843 opt->option_name);
844 return -1;
845 }
846
847 if (!opt->values) {
848 /* *=NULLopt_arg contains pointer to argument */
849 *opt_arg = p;
850 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
851 }
852
853 /* values possible for this option are listed in opt->values */
854 for (arg = opt->values; arg->value; arg++) {
855 if (!strcmp(p, arg->value)) {
856 if (bit_flags) {
857 *bit_flags &= ~arg->clrmask;
858 *bit_flags |= arg->setmask;
859 }
860 return opt->arg_required;
861 }
862 }
863
864 reiserfs_warning(s, "super-6506",
865 "bad value \"%s\" for option \"%s\"\n", p,
866 opt->option_name);
867 return -1;
868 }
869
870 /* returns 0 if something is wrong in option string, 1 - otherwise */
871 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
872 unsigned long *mount_options,
873 /* after the parsing phase, contains the
874 collection of bitflags defining what
875 mount options were selected. */
876 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
877 char **jdev_name,
878 unsigned int *commit_max_age,
879 char **qf_names,
880 unsigned int *qfmt)
881 {
882 int c;
883 char *arg = NULL;
884 char *pos;
885 opt_desc_t opts[] = {
886 /* Compatibility stuff, so that -o notail for old setups still work */
887 {"tails",.arg_required = 't',.values = tails},
888 {"notail",.clrmask =
889 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
890 {"conv",.setmask = 1 << REISERFS_CONVERT},
891 {"attrs",.setmask = 1 << REISERFS_ATTRS},
892 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
893 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
894 #ifdef CONFIG_REISERFS_FS_XATTR
895 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
896 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
897 #else
898 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
899 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
900 #endif
901 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
902 {"acl",.setmask = 1 << REISERFS_POSIXACL},
903 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
904 #else
905 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
906 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
907 #endif
908 {.option_name = "nolog"},
909 {"replayonly",.setmask = 1 << REPLAYONLY},
910 {"block-allocator",.arg_required = 'a',.values = balloc},
911 {"data",.arg_required = 'd',.values = logging_mode},
912 {"barrier",.arg_required = 'b',.values = barrier_mode},
913 {"resize",.arg_required = 'r',.values = NULL},
914 {"jdev",.arg_required = 'j',.values = NULL},
915 {"nolargeio",.arg_required = 'w',.values = NULL},
916 {"commit",.arg_required = 'c',.values = NULL},
917 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
918 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
919 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
920 {"errors",.arg_required = 'e',.values = error_actions},
921 {"usrjquota",.arg_required =
922 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
923 {"grpjquota",.arg_required =
924 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
925 {"jqfmt",.arg_required = 'f',.values = NULL},
926 {.option_name = NULL}
927 };
928
929 *blocks = 0;
930 if (!options || !*options)
931 /* use default configuration: create tails, journaling on, no
932 conversion to newest format */
933 return 1;
934
935 for (pos = options; pos;) {
936 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
937 if (c == -1)
938 /* wrong option is given */
939 return 0;
940
941 if (c == 'r') {
942 char *p;
943
944 p = NULL;
945 /* "resize=NNN" or "resize=auto" */
946
947 if (!strcmp(arg, "auto")) {
948 /* From JFS code, to auto-get the size. */
949 *blocks =
950 s->s_bdev->bd_inode->i_size >> s->
951 s_blocksize_bits;
952 } else {
953 *blocks = simple_strtoul(arg, &p, 0);
954 if (*p != '\0') {
955 /* NNN does not look like a number */
956 reiserfs_warning(s, "super-6507",
957 "bad value %s for "
958 "-oresize\n", arg);
959 return 0;
960 }
961 }
962 }
963
964 if (c == 'c') {
965 char *p = NULL;
966 unsigned long val = simple_strtoul(arg, &p, 0);
967 /* commit=NNN (time in seconds) */
968 if (*p != '\0' || val >= (unsigned int)-1) {
969 reiserfs_warning(s, "super-6508",
970 "bad value %s for -ocommit\n",
971 arg);
972 return 0;
973 }
974 *commit_max_age = (unsigned int)val;
975 }
976
977 if (c == 'w') {
978 reiserfs_warning(s, "super-6509", "nolargeio option "
979 "is no longer supported");
980 return 0;
981 }
982
983 if (c == 'j') {
984 if (arg && *arg && jdev_name) {
985 if (*jdev_name) { //Hm, already assigned?
986 reiserfs_warning(s, "super-6510",
987 "journal device was "
988 "already specified to "
989 "be %s", *jdev_name);
990 return 0;
991 }
992 *jdev_name = arg;
993 }
994 }
995 #ifdef CONFIG_QUOTA
996 if (c == 'u' || c == 'g') {
997 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
998
999 if (sb_any_quota_loaded(s) &&
1000 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1001 reiserfs_warning(s, "super-6511",
1002 "cannot change journaled "
1003 "quota options when quota "
1004 "turned on.");
1005 return 0;
1006 }
1007 if (*arg) { /* Some filename specified? */
1008 if (REISERFS_SB(s)->s_qf_names[qtype]
1009 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1010 arg)) {
1011 reiserfs_warning(s, "super-6512",
1012 "%s quota file "
1013 "already specified.",
1014 QTYPE2NAME(qtype));
1015 return 0;
1016 }
1017 if (strchr(arg, '/')) {
1018 reiserfs_warning(s, "super-6513",
1019 "quotafile must be "
1020 "on filesystem root.");
1021 return 0;
1022 }
1023 qf_names[qtype] =
1024 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1025 if (!qf_names[qtype]) {
1026 reiserfs_warning(s, "reiserfs-2502",
1027 "not enough memory "
1028 "for storing "
1029 "quotafile name.");
1030 return 0;
1031 }
1032 strcpy(qf_names[qtype], arg);
1033 *mount_options |= 1 << REISERFS_QUOTA;
1034 } else {
1035 if (qf_names[qtype] !=
1036 REISERFS_SB(s)->s_qf_names[qtype])
1037 kfree(qf_names[qtype]);
1038 qf_names[qtype] = NULL;
1039 }
1040 }
1041 if (c == 'f') {
1042 if (!strcmp(arg, "vfsold"))
1043 *qfmt = QFMT_VFS_OLD;
1044 else if (!strcmp(arg, "vfsv0"))
1045 *qfmt = QFMT_VFS_V0;
1046 else {
1047 reiserfs_warning(s, "super-6514",
1048 "unknown quota format "
1049 "specified.");
1050 return 0;
1051 }
1052 if (sb_any_quota_loaded(s) &&
1053 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1054 reiserfs_warning(s, "super-6515",
1055 "cannot change journaled "
1056 "quota options when quota "
1057 "turned on.");
1058 return 0;
1059 }
1060 }
1061 #else
1062 if (c == 'u' || c == 'g' || c == 'f') {
1063 reiserfs_warning(s, "reiserfs-2503", "journaled "
1064 "quota options not supported.");
1065 return 0;
1066 }
1067 #endif
1068 }
1069
1070 #ifdef CONFIG_QUOTA
1071 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1072 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1073 reiserfs_warning(s, "super-6515",
1074 "journaled quota format not specified.");
1075 return 0;
1076 }
1077 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1078 if (!(*mount_options & (1 << REISERFS_QUOTA))
1079 && sb_any_quota_loaded(s)) {
1080 reiserfs_warning(s, "super-6516", "quota options must "
1081 "be present when quota is turned on.");
1082 return 0;
1083 }
1084 #endif
1085
1086 return 1;
1087 }
1088
1089 static void switch_data_mode(struct super_block *s, unsigned long mode)
1090 {
1091 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1092 (1 << REISERFS_DATA_ORDERED) |
1093 (1 << REISERFS_DATA_WRITEBACK));
1094 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1095 }
1096
1097 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1098 {
1099 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1100 if (!reiserfs_data_log(s)) {
1101 switch_data_mode(s, REISERFS_DATA_LOG);
1102 reiserfs_info(s, "switching to journaled data mode\n");
1103 }
1104 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1105 if (!reiserfs_data_ordered(s)) {
1106 switch_data_mode(s, REISERFS_DATA_ORDERED);
1107 reiserfs_info(s, "switching to ordered data mode\n");
1108 }
1109 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1110 if (!reiserfs_data_writeback(s)) {
1111 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1112 reiserfs_info(s, "switching to writeback data mode\n");
1113 }
1114 }
1115 }
1116
1117 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1118 {
1119 int flush = (1 << REISERFS_BARRIER_FLUSH);
1120 int none = (1 << REISERFS_BARRIER_NONE);
1121 int all_barrier = flush | none;
1122
1123 if (bits & all_barrier) {
1124 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1125 if (bits & flush) {
1126 REISERFS_SB(s)->s_mount_opt |= flush;
1127 printk("reiserfs: enabling write barrier flush mode\n");
1128 } else if (bits & none) {
1129 REISERFS_SB(s)->s_mount_opt |= none;
1130 printk("reiserfs: write barriers turned off\n");
1131 }
1132 }
1133 }
1134
1135 static void handle_attrs(struct super_block *s)
1136 {
1137 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1138
1139 if (reiserfs_attrs(s)) {
1140 if (old_format_only(s)) {
1141 reiserfs_warning(s, "super-6517", "cannot support "
1142 "attributes on 3.5.x disk format");
1143 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1144 return;
1145 }
1146 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1147 reiserfs_warning(s, "super-6518", "cannot support "
1148 "attributes until flag is set in "
1149 "super-block");
1150 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1151 }
1152 }
1153 }
1154
1155 #ifdef CONFIG_QUOTA
1156 static void handle_quota_files(struct super_block *s, char **qf_names,
1157 unsigned int *qfmt)
1158 {
1159 int i;
1160
1161 for (i = 0; i < MAXQUOTAS; i++) {
1162 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1163 kfree(REISERFS_SB(s)->s_qf_names[i]);
1164 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1165 }
1166 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1167 }
1168 #endif
1169
1170 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1171 {
1172 struct reiserfs_super_block *rs;
1173 struct reiserfs_transaction_handle th;
1174 unsigned long blocks;
1175 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1176 unsigned long safe_mask = 0;
1177 unsigned int commit_max_age = (unsigned int)-1;
1178 struct reiserfs_journal *journal = SB_JOURNAL(s);
1179 char *new_opts = kstrdup(arg, GFP_KERNEL);
1180 int err;
1181 char *qf_names[MAXQUOTAS];
1182 unsigned int qfmt = 0;
1183 #ifdef CONFIG_QUOTA
1184 int i;
1185 #endif
1186
1187 reiserfs_write_lock(s);
1188
1189 #ifdef CONFIG_QUOTA
1190 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1191 #endif
1192
1193 rs = SB_DISK_SUPER_BLOCK(s);
1194
1195 if (!reiserfs_parse_options
1196 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1197 qf_names, &qfmt)) {
1198 #ifdef CONFIG_QUOTA
1199 for (i = 0; i < MAXQUOTAS; i++)
1200 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1201 kfree(qf_names[i]);
1202 #endif
1203 err = -EINVAL;
1204 goto out_err;
1205 }
1206 #ifdef CONFIG_QUOTA
1207 handle_quota_files(s, qf_names, &qfmt);
1208 #endif
1209
1210 handle_attrs(s);
1211
1212 /* Add options that are safe here */
1213 safe_mask |= 1 << REISERFS_SMALLTAIL;
1214 safe_mask |= 1 << REISERFS_LARGETAIL;
1215 safe_mask |= 1 << REISERFS_NO_BORDER;
1216 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1217 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1218 safe_mask |= 1 << REISERFS_TEST4;
1219 safe_mask |= 1 << REISERFS_ATTRS;
1220 safe_mask |= 1 << REISERFS_XATTRS_USER;
1221 safe_mask |= 1 << REISERFS_POSIXACL;
1222 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1223 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1224 safe_mask |= 1 << REISERFS_ERROR_RO;
1225 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1226 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1227 safe_mask |= 1 << REISERFS_QUOTA;
1228
1229 /* Update the bitmask, taking care to keep
1230 * the bits we're not allowed to change here */
1231 REISERFS_SB(s)->s_mount_opt =
1232 (REISERFS_SB(s)->
1233 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1234
1235 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1236 journal->j_max_commit_age = commit_max_age;
1237 journal->j_max_trans_age = commit_max_age;
1238 } else if (commit_max_age == 0) {
1239 /* 0 means restore defaults. */
1240 journal->j_max_commit_age = journal->j_default_max_commit_age;
1241 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1242 }
1243
1244 if (blocks) {
1245 err = reiserfs_resize(s, blocks);
1246 if (err != 0)
1247 goto out_err;
1248 }
1249
1250 if (*mount_flags & MS_RDONLY) {
1251 reiserfs_xattr_init(s, *mount_flags);
1252 /* remount read-only */
1253 if (s->s_flags & MS_RDONLY)
1254 /* it is read-only already */
1255 goto out_ok;
1256
1257 err = dquot_suspend(s, -1);
1258 if (err < 0)
1259 goto out_err;
1260
1261 /* try to remount file system with read-only permissions */
1262 if (sb_umount_state(rs) == REISERFS_VALID_FS
1263 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1264 goto out_ok;
1265 }
1266
1267 err = journal_begin(&th, s, 10);
1268 if (err)
1269 goto out_err;
1270
1271 /* Mounting a rw partition read-only. */
1272 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1273 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1274 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1275 } else {
1276 /* remount read-write */
1277 if (!(s->s_flags & MS_RDONLY)) {
1278 reiserfs_xattr_init(s, *mount_flags);
1279 goto out_ok; /* We are read-write already */
1280 }
1281
1282 if (reiserfs_is_journal_aborted(journal)) {
1283 err = journal->j_errno;
1284 goto out_err;
1285 }
1286
1287 handle_data_mode(s, mount_options);
1288 handle_barrier_mode(s, mount_options);
1289 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1290 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1291 err = journal_begin(&th, s, 10);
1292 if (err)
1293 goto out_err;
1294
1295 /* Mount a partition which is read-only, read-write */
1296 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1297 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1298 s->s_flags &= ~MS_RDONLY;
1299 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1300 if (!old_format_only(s))
1301 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1302 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1303 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1304 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1305 }
1306 /* this will force a full flush of all journal lists */
1307 SB_JOURNAL(s)->j_must_wait = 1;
1308 err = journal_end(&th, s, 10);
1309 if (err)
1310 goto out_err;
1311 s->s_dirt = 0;
1312
1313 if (!(*mount_flags & MS_RDONLY)) {
1314 dquot_resume(s, -1);
1315 finish_unfinished(s);
1316 reiserfs_xattr_init(s, *mount_flags);
1317 }
1318
1319 out_ok:
1320 replace_mount_options(s, new_opts);
1321 reiserfs_write_unlock(s);
1322 return 0;
1323
1324 out_err:
1325 kfree(new_opts);
1326 reiserfs_write_unlock(s);
1327 return err;
1328 }
1329
1330 static int read_super_block(struct super_block *s, int offset)
1331 {
1332 struct buffer_head *bh;
1333 struct reiserfs_super_block *rs;
1334 int fs_blocksize;
1335
1336 bh = sb_bread(s, offset / s->s_blocksize);
1337 if (!bh) {
1338 reiserfs_warning(s, "sh-2006",
1339 "bread failed (dev %s, block %lu, size %lu)",
1340 reiserfs_bdevname(s), offset / s->s_blocksize,
1341 s->s_blocksize);
1342 return 1;
1343 }
1344
1345 rs = (struct reiserfs_super_block *)bh->b_data;
1346 if (!is_any_reiserfs_magic_string(rs)) {
1347 brelse(bh);
1348 return 1;
1349 }
1350 //
1351 // ok, reiserfs signature (old or new) found in at the given offset
1352 //
1353 fs_blocksize = sb_blocksize(rs);
1354 brelse(bh);
1355 sb_set_blocksize(s, fs_blocksize);
1356
1357 bh = sb_bread(s, offset / s->s_blocksize);
1358 if (!bh) {
1359 reiserfs_warning(s, "sh-2007",
1360 "bread failed (dev %s, block %lu, size %lu)",
1361 reiserfs_bdevname(s), offset / s->s_blocksize,
1362 s->s_blocksize);
1363 return 1;
1364 }
1365
1366 rs = (struct reiserfs_super_block *)bh->b_data;
1367 if (sb_blocksize(rs) != s->s_blocksize) {
1368 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1369 "filesystem on (dev %s, block %Lu, size %lu)",
1370 reiserfs_bdevname(s),
1371 (unsigned long long)bh->b_blocknr,
1372 s->s_blocksize);
1373 brelse(bh);
1374 return 1;
1375 }
1376
1377 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1378 brelse(bh);
1379 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1380 "--rebuild-tree run detected. Please run\n"
1381 "reiserfsck --rebuild-tree and wait for a "
1382 "completion. If that fails\n"
1383 "get newer reiserfsprogs package");
1384 return 1;
1385 }
1386
1387 SB_BUFFER_WITH_SB(s) = bh;
1388 SB_DISK_SUPER_BLOCK(s) = rs;
1389
1390 if (is_reiserfs_jr(rs)) {
1391 /* magic is of non-standard journal filesystem, look at s_version to
1392 find which format is in use */
1393 if (sb_version(rs) == REISERFS_VERSION_2)
1394 reiserfs_info(s, "found reiserfs format \"3.6\""
1395 " with non-standard journal\n");
1396 else if (sb_version(rs) == REISERFS_VERSION_1)
1397 reiserfs_info(s, "found reiserfs format \"3.5\""
1398 " with non-standard journal\n");
1399 else {
1400 reiserfs_warning(s, "sh-2012", "found unknown "
1401 "format \"%u\" of reiserfs with "
1402 "non-standard magic", sb_version(rs));
1403 return 1;
1404 }
1405 } else
1406 /* s_version of standard format may contain incorrect information,
1407 so we just look at the magic string */
1408 reiserfs_info(s,
1409 "found reiserfs format \"%s\" with standard journal\n",
1410 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1411
1412 s->s_op = &reiserfs_sops;
1413 s->s_export_op = &reiserfs_export_ops;
1414 #ifdef CONFIG_QUOTA
1415 s->s_qcop = &reiserfs_qctl_operations;
1416 s->dq_op = &reiserfs_quota_operations;
1417 #endif
1418
1419 /* new format is limited by the 32 bit wide i_blocks field, want to
1420 ** be one full block below that.
1421 */
1422 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1423 return 0;
1424 }
1425
1426 /* after journal replay, reread all bitmap and super blocks */
1427 static int reread_meta_blocks(struct super_block *s)
1428 {
1429 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1430 reiserfs_write_unlock(s);
1431 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1432 reiserfs_write_lock(s);
1433 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1434 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1435 return 1;
1436 }
1437
1438 return 0;
1439 }
1440
1441 /////////////////////////////////////////////////////
1442 // hash detection stuff
1443
1444 // if root directory is empty - we set default - Yura's - hash and
1445 // warn about it
1446 // FIXME: we look for only one name in a directory. If tea and yura
1447 // bith have the same value - we ask user to send report to the
1448 // mailing list
1449 static __u32 find_hash_out(struct super_block *s)
1450 {
1451 int retval;
1452 struct inode *inode;
1453 struct cpu_key key;
1454 INITIALIZE_PATH(path);
1455 struct reiserfs_dir_entry de;
1456 __u32 hash = DEFAULT_HASH;
1457
1458 inode = s->s_root->d_inode;
1459
1460 do { // Some serious "goto"-hater was there ;)
1461 u32 teahash, r5hash, yurahash;
1462
1463 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1464 retval = search_by_entry_key(s, &key, &path, &de);
1465 if (retval == IO_ERROR) {
1466 pathrelse(&path);
1467 return UNSET_HASH;
1468 }
1469 if (retval == NAME_NOT_FOUND)
1470 de.de_entry_num--;
1471 set_de_name_and_namelen(&de);
1472 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1473 /* allow override in this case */
1474 if (reiserfs_rupasov_hash(s)) {
1475 hash = YURA_HASH;
1476 }
1477 reiserfs_info(s, "FS seems to be empty, autodetect "
1478 "is using the default hash\n");
1479 break;
1480 }
1481 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1482 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1483 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1484 if (((teahash == r5hash)
1485 &&
1486 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1487 == r5hash)) || ((teahash == yurahash)
1488 && (yurahash ==
1489 GET_HASH_VALUE(deh_offset
1490 (&
1491 (de.
1492 de_deh[de.
1493 de_entry_num])))))
1494 || ((r5hash == yurahash)
1495 && (yurahash ==
1496 GET_HASH_VALUE(deh_offset
1497 (&(de.de_deh[de.de_entry_num])))))) {
1498 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1499 "automatically detect hash function. "
1500 "Please mount with -o "
1501 "hash={tea,rupasov,r5}");
1502 hash = UNSET_HASH;
1503 break;
1504 }
1505 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1506 yurahash)
1507 hash = YURA_HASH;
1508 else if (GET_HASH_VALUE
1509 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1510 hash = TEA_HASH;
1511 else if (GET_HASH_VALUE
1512 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1513 hash = R5_HASH;
1514 else {
1515 reiserfs_warning(s, "reiserfs-2506",
1516 "Unrecognised hash function");
1517 hash = UNSET_HASH;
1518 }
1519 } while (0);
1520
1521 pathrelse(&path);
1522 return hash;
1523 }
1524
1525 // finds out which hash names are sorted with
1526 static int what_hash(struct super_block *s)
1527 {
1528 __u32 code;
1529
1530 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1531
1532 /* reiserfs_hash_detect() == true if any of the hash mount options
1533 ** were used. We must check them to make sure the user isn't
1534 ** using a bad hash value
1535 */
1536 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1537 code = find_hash_out(s);
1538
1539 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1540 /* detection has found the hash, and we must check against the
1541 ** mount options
1542 */
1543 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1544 reiserfs_warning(s, "reiserfs-2507",
1545 "Error, %s hash detected, "
1546 "unable to force rupasov hash",
1547 reiserfs_hashname(code));
1548 code = UNSET_HASH;
1549 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1550 reiserfs_warning(s, "reiserfs-2508",
1551 "Error, %s hash detected, "
1552 "unable to force tea hash",
1553 reiserfs_hashname(code));
1554 code = UNSET_HASH;
1555 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1556 reiserfs_warning(s, "reiserfs-2509",
1557 "Error, %s hash detected, "
1558 "unable to force r5 hash",
1559 reiserfs_hashname(code));
1560 code = UNSET_HASH;
1561 }
1562 } else {
1563 /* find_hash_out was not called or could not determine the hash */
1564 if (reiserfs_rupasov_hash(s)) {
1565 code = YURA_HASH;
1566 } else if (reiserfs_tea_hash(s)) {
1567 code = TEA_HASH;
1568 } else if (reiserfs_r5_hash(s)) {
1569 code = R5_HASH;
1570 }
1571 }
1572
1573 /* if we are mounted RW, and we have a new valid hash code, update
1574 ** the super
1575 */
1576 if (code != UNSET_HASH &&
1577 !(s->s_flags & MS_RDONLY) &&
1578 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1579 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1580 }
1581 return code;
1582 }
1583
1584 // return pointer to appropriate function
1585 static hashf_t hash_function(struct super_block *s)
1586 {
1587 switch (what_hash(s)) {
1588 case TEA_HASH:
1589 reiserfs_info(s, "Using tea hash to sort names\n");
1590 return keyed_hash;
1591 case YURA_HASH:
1592 reiserfs_info(s, "Using rupasov hash to sort names\n");
1593 return yura_hash;
1594 case R5_HASH:
1595 reiserfs_info(s, "Using r5 hash to sort names\n");
1596 return r5_hash;
1597 }
1598 return NULL;
1599 }
1600
1601 // this is used to set up correct value for old partitions
1602 static int function2code(hashf_t func)
1603 {
1604 if (func == keyed_hash)
1605 return TEA_HASH;
1606 if (func == yura_hash)
1607 return YURA_HASH;
1608 if (func == r5_hash)
1609 return R5_HASH;
1610
1611 BUG(); // should never happen
1612
1613 return 0;
1614 }
1615
1616 #define SWARN(silent, s, id, ...) \
1617 if (!(silent)) \
1618 reiserfs_warning(s, id, __VA_ARGS__)
1619
1620 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1621 {
1622 struct inode *root_inode;
1623 struct reiserfs_transaction_handle th;
1624 int old_format = 0;
1625 unsigned long blocks;
1626 unsigned int commit_max_age = 0;
1627 int jinit_done = 0;
1628 struct reiserfs_iget_args args;
1629 struct reiserfs_super_block *rs;
1630 char *jdev_name;
1631 struct reiserfs_sb_info *sbi;
1632 int errval = -EINVAL;
1633 char *qf_names[MAXQUOTAS] = {};
1634 unsigned int qfmt = 0;
1635
1636 save_mount_options(s, data);
1637
1638 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1639 if (!sbi)
1640 return -ENOMEM;
1641 s->s_fs_info = sbi;
1642 /* Set default values for options: non-aggressive tails, RO on errors */
1643 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1644 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1645 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1646 /* no preallocation minimum, be smart in
1647 reiserfs_file_write instead */
1648 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1649 /* Preallocate by 16 blocks (17-1) at once */
1650 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1651 /* setup default block allocator options */
1652 reiserfs_init_alloc_options(s);
1653
1654 mutex_init(&REISERFS_SB(s)->lock);
1655 REISERFS_SB(s)->lock_depth = -1;
1656
1657 /*
1658 * This function is called with the bkl, which also was the old
1659 * locking used here.
1660 * do_journal_begin() will soon check if we hold the lock (ie: was the
1661 * bkl). This is likely because do_journal_begin() has several another
1662 * callers because at this time, it doesn't seem to be necessary to
1663 * protect against anything.
1664 * Anyway, let's be conservative and lock for now.
1665 */
1666 reiserfs_write_lock(s);
1667
1668 jdev_name = NULL;
1669 if (reiserfs_parse_options
1670 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1671 &commit_max_age, qf_names, &qfmt) == 0) {
1672 goto error;
1673 }
1674 #ifdef CONFIG_QUOTA
1675 handle_quota_files(s, qf_names, &qfmt);
1676 #endif
1677
1678 if (blocks) {
1679 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1680 goto error;
1681 }
1682
1683 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1684 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1685 old_format = 1;
1686 /* try new format (64-th 1k block), which can contain reiserfs super block */
1687 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1688 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1689 reiserfs_bdevname(s));
1690 goto error;
1691 }
1692
1693 rs = SB_DISK_SUPER_BLOCK(s);
1694 /* Let's do basic sanity check to verify that underlying device is not
1695 smaller than the filesystem. If the check fails then abort and scream,
1696 because bad stuff will happen otherwise. */
1697 if (s->s_bdev && s->s_bdev->bd_inode
1698 && i_size_read(s->s_bdev->bd_inode) <
1699 sb_block_count(rs) * sb_blocksize(rs)) {
1700 SWARN(silent, s, "", "Filesystem cannot be "
1701 "mounted because it is bigger than the device");
1702 SWARN(silent, s, "", "You may need to run fsck "
1703 "or increase size of your LVM partition");
1704 SWARN(silent, s, "", "Or may be you forgot to "
1705 "reboot after fdisk when it told you to");
1706 goto error;
1707 }
1708
1709 sbi->s_mount_state = SB_REISERFS_STATE(s);
1710 sbi->s_mount_state = REISERFS_VALID_FS;
1711
1712 if ((errval = reiserfs_init_bitmap_cache(s))) {
1713 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1714 goto error;
1715 }
1716 errval = -EINVAL;
1717 #ifdef CONFIG_REISERFS_CHECK
1718 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1719 SWARN(silent, s, "", "- it is slow mode for debugging.");
1720 #endif
1721
1722 /* make data=ordered the default */
1723 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1724 !reiserfs_data_writeback(s)) {
1725 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1726 }
1727
1728 if (reiserfs_data_log(s)) {
1729 reiserfs_info(s, "using journaled data mode\n");
1730 } else if (reiserfs_data_ordered(s)) {
1731 reiserfs_info(s, "using ordered data mode\n");
1732 } else {
1733 reiserfs_info(s, "using writeback data mode\n");
1734 }
1735 if (reiserfs_barrier_flush(s)) {
1736 printk("reiserfs: using flush barriers\n");
1737 }
1738 // set_device_ro(s->s_dev, 1) ;
1739 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1740 SWARN(silent, s, "sh-2022",
1741 "unable to initialize journal space");
1742 goto error;
1743 } else {
1744 jinit_done = 1; /* once this is set, journal_release must be called
1745 ** if we error out of the mount
1746 */
1747 }
1748 if (reread_meta_blocks(s)) {
1749 SWARN(silent, s, "jmacd-9",
1750 "unable to reread meta blocks after journal init");
1751 goto error;
1752 }
1753
1754 if (replay_only(s))
1755 goto error;
1756
1757 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1758 SWARN(silent, s, "clm-7000",
1759 "Detected readonly device, marking FS readonly");
1760 s->s_flags |= MS_RDONLY;
1761 }
1762 args.objectid = REISERFS_ROOT_OBJECTID;
1763 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1764 root_inode =
1765 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1766 reiserfs_init_locked_inode, (void *)(&args));
1767 if (!root_inode) {
1768 SWARN(silent, s, "jmacd-10", "get root inode failed");
1769 goto error;
1770 }
1771
1772 if (root_inode->i_state & I_NEW) {
1773 reiserfs_read_locked_inode(root_inode, &args);
1774 unlock_new_inode(root_inode);
1775 }
1776
1777 s->s_root = d_alloc_root(root_inode);
1778 if (!s->s_root) {
1779 iput(root_inode);
1780 goto error;
1781 }
1782 // define and initialize hash function
1783 sbi->s_hash_function = hash_function(s);
1784 if (sbi->s_hash_function == NULL) {
1785 dput(s->s_root);
1786 s->s_root = NULL;
1787 goto error;
1788 }
1789
1790 if (is_reiserfs_3_5(rs)
1791 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1792 set_bit(REISERFS_3_5, &(sbi->s_properties));
1793 else if (old_format)
1794 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1795 else
1796 set_bit(REISERFS_3_6, &(sbi->s_properties));
1797
1798 if (!(s->s_flags & MS_RDONLY)) {
1799
1800 errval = journal_begin(&th, s, 1);
1801 if (errval) {
1802 dput(s->s_root);
1803 s->s_root = NULL;
1804 goto error;
1805 }
1806 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1807
1808 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1809 set_sb_fs_state(rs, 0);
1810
1811 /* Clear out s_bmap_nr if it would wrap. We can handle this
1812 * case, but older revisions can't. This will cause the
1813 * file system to fail mount on those older implementations,
1814 * avoiding corruption. -jeffm */
1815 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1816 sb_bmap_nr(rs) != 0) {
1817 reiserfs_warning(s, "super-2030", "This file system "
1818 "claims to use %u bitmap blocks in "
1819 "its super block, but requires %u. "
1820 "Clearing to zero.", sb_bmap_nr(rs),
1821 reiserfs_bmap_count(s));
1822
1823 set_sb_bmap_nr(rs, 0);
1824 }
1825
1826 if (old_format_only(s)) {
1827 /* filesystem of format 3.5 either with standard or non-standard
1828 journal */
1829 if (convert_reiserfs(s)) {
1830 /* and -o conv is given */
1831 if (!silent)
1832 reiserfs_info(s,
1833 "converting 3.5 filesystem to the 3.6 format");
1834
1835 if (is_reiserfs_3_5(rs))
1836 /* put magic string of 3.6 format. 2.2 will not be able to
1837 mount this filesystem anymore */
1838 memcpy(rs->s_v1.s_magic,
1839 reiserfs_3_6_magic_string,
1840 sizeof
1841 (reiserfs_3_6_magic_string));
1842
1843 set_sb_version(rs, REISERFS_VERSION_2);
1844 reiserfs_convert_objectid_map_v1(s);
1845 set_bit(REISERFS_3_6, &(sbi->s_properties));
1846 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1847 } else if (!silent) {
1848 reiserfs_info(s, "using 3.5.x disk format\n");
1849 }
1850 } else
1851 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1852
1853
1854 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1855 errval = journal_end(&th, s, 1);
1856 if (errval) {
1857 dput(s->s_root);
1858 s->s_root = NULL;
1859 goto error;
1860 }
1861
1862 if ((errval = reiserfs_lookup_privroot(s)) ||
1863 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1864 dput(s->s_root);
1865 s->s_root = NULL;
1866 goto error;
1867 }
1868
1869 /* look for files which were to be removed in previous session */
1870 finish_unfinished(s);
1871 } else {
1872 if (old_format_only(s) && !silent) {
1873 reiserfs_info(s, "using 3.5.x disk format\n");
1874 }
1875
1876 if ((errval = reiserfs_lookup_privroot(s)) ||
1877 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1878 dput(s->s_root);
1879 s->s_root = NULL;
1880 goto error;
1881 }
1882 }
1883 // mark hash in super block: it could be unset. overwrite should be ok
1884 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1885
1886 handle_attrs(s);
1887
1888 reiserfs_proc_info_init(s);
1889
1890 init_waitqueue_head(&(sbi->s_wait));
1891 spin_lock_init(&sbi->bitmap_lock);
1892
1893 reiserfs_write_unlock(s);
1894
1895 return (0);
1896
1897 error:
1898 if (jinit_done) { /* kill the commit thread, free journal ram */
1899 journal_release_error(NULL, s);
1900 }
1901
1902 reiserfs_write_unlock(s);
1903
1904 reiserfs_free_bitmap_cache(s);
1905 if (SB_BUFFER_WITH_SB(s))
1906 brelse(SB_BUFFER_WITH_SB(s));
1907 #ifdef CONFIG_QUOTA
1908 {
1909 int j;
1910 for (j = 0; j < MAXQUOTAS; j++)
1911 kfree(qf_names[j]);
1912 }
1913 #endif
1914 kfree(sbi);
1915
1916 s->s_fs_info = NULL;
1917 return errval;
1918 }
1919
1920 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1921 {
1922 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1923
1924 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1925 buf->f_bfree = sb_free_blocks(rs);
1926 buf->f_bavail = buf->f_bfree;
1927 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1928 buf->f_bsize = dentry->d_sb->s_blocksize;
1929 /* changed to accommodate gcc folks. */
1930 buf->f_type = REISERFS_SUPER_MAGIC;
1931 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1932 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1933 sizeof(rs->s_uuid)/2);
1934
1935 return 0;
1936 }
1937
1938 #ifdef CONFIG_QUOTA
1939 static int reiserfs_write_dquot(struct dquot *dquot)
1940 {
1941 struct reiserfs_transaction_handle th;
1942 int ret, err;
1943
1944 reiserfs_write_lock(dquot->dq_sb);
1945 ret =
1946 journal_begin(&th, dquot->dq_sb,
1947 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1948 if (ret)
1949 goto out;
1950 ret = dquot_commit(dquot);
1951 err =
1952 journal_end(&th, dquot->dq_sb,
1953 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1954 if (!ret && err)
1955 ret = err;
1956 out:
1957 reiserfs_write_unlock(dquot->dq_sb);
1958 return ret;
1959 }
1960
1961 static int reiserfs_acquire_dquot(struct dquot *dquot)
1962 {
1963 struct reiserfs_transaction_handle th;
1964 int ret, err;
1965
1966 reiserfs_write_lock(dquot->dq_sb);
1967 ret =
1968 journal_begin(&th, dquot->dq_sb,
1969 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1970 if (ret)
1971 goto out;
1972 ret = dquot_acquire(dquot);
1973 err =
1974 journal_end(&th, dquot->dq_sb,
1975 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1976 if (!ret && err)
1977 ret = err;
1978 out:
1979 reiserfs_write_unlock(dquot->dq_sb);
1980 return ret;
1981 }
1982
1983 static int reiserfs_release_dquot(struct dquot *dquot)
1984 {
1985 struct reiserfs_transaction_handle th;
1986 int ret, err;
1987
1988 reiserfs_write_lock(dquot->dq_sb);
1989 ret =
1990 journal_begin(&th, dquot->dq_sb,
1991 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1992 if (ret) {
1993 /* Release dquot anyway to avoid endless cycle in dqput() */
1994 dquot_release(dquot);
1995 goto out;
1996 }
1997 ret = dquot_release(dquot);
1998 err =
1999 journal_end(&th, dquot->dq_sb,
2000 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2001 if (!ret && err)
2002 ret = err;
2003 out:
2004 reiserfs_write_unlock(dquot->dq_sb);
2005 return ret;
2006 }
2007
2008 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2009 {
2010 /* Are we journaling quotas? */
2011 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2012 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2013 dquot_mark_dquot_dirty(dquot);
2014 return reiserfs_write_dquot(dquot);
2015 } else
2016 return dquot_mark_dquot_dirty(dquot);
2017 }
2018
2019 static int reiserfs_write_info(struct super_block *sb, int type)
2020 {
2021 struct reiserfs_transaction_handle th;
2022 int ret, err;
2023
2024 /* Data block + inode block */
2025 reiserfs_write_lock(sb);
2026 ret = journal_begin(&th, sb, 2);
2027 if (ret)
2028 goto out;
2029 ret = dquot_commit_info(sb, type);
2030 err = journal_end(&th, sb, 2);
2031 if (!ret && err)
2032 ret = err;
2033 out:
2034 reiserfs_write_unlock(sb);
2035 return ret;
2036 }
2037
2038 /*
2039 * Turn on quotas during mount time - we need to find the quota file and such...
2040 */
2041 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2042 {
2043 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2044 REISERFS_SB(sb)->s_jquota_fmt, type);
2045 }
2046
2047 /*
2048 * Standard function to be called on quota_on
2049 */
2050 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2051 struct path *path)
2052 {
2053 int err;
2054 struct inode *inode;
2055 struct reiserfs_transaction_handle th;
2056
2057 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2058 return -EINVAL;
2059
2060 /* Quotafile not on the same filesystem? */
2061 if (path->dentry->d_sb != sb) {
2062 err = -EXDEV;
2063 goto out;
2064 }
2065 inode = path->dentry->d_inode;
2066 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2067 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2068 err = reiserfs_unpack(inode, NULL);
2069 if (err) {
2070 reiserfs_warning(sb, "super-6520",
2071 "Unpacking tail of quota file failed"
2072 " (%d). Cannot turn on quotas.", err);
2073 err = -EINVAL;
2074 goto out;
2075 }
2076 mark_inode_dirty(inode);
2077 }
2078 /* Journaling quota? */
2079 if (REISERFS_SB(sb)->s_qf_names[type]) {
2080 /* Quotafile not of fs root? */
2081 if (path->dentry->d_parent != sb->s_root)
2082 reiserfs_warning(sb, "super-6521",
2083 "Quota file not on filesystem root. "
2084 "Journalled quota will not work.");
2085 }
2086
2087 /*
2088 * When we journal data on quota file, we have to flush journal to see
2089 * all updates to the file when we bypass pagecache...
2090 */
2091 if (reiserfs_file_data_log(inode)) {
2092 /* Just start temporary transaction and finish it */
2093 err = journal_begin(&th, sb, 1);
2094 if (err)
2095 goto out;
2096 err = journal_end_sync(&th, sb, 1);
2097 if (err)
2098 goto out;
2099 }
2100 err = dquot_quota_on(sb, type, format_id, path);
2101 out:
2102 return err;
2103 }
2104
2105 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2106 * acquiring the locks... As quota files are never truncated and quota code
2107 * itself serializes the operations (and no one else should touch the files)
2108 * we don't have to be afraid of races */
2109 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2110 size_t len, loff_t off)
2111 {
2112 struct inode *inode = sb_dqopt(sb)->files[type];
2113 unsigned long blk = off >> sb->s_blocksize_bits;
2114 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2115 size_t toread;
2116 struct buffer_head tmp_bh, *bh;
2117 loff_t i_size = i_size_read(inode);
2118
2119 if (off > i_size)
2120 return 0;
2121 if (off + len > i_size)
2122 len = i_size - off;
2123 toread = len;
2124 while (toread > 0) {
2125 tocopy =
2126 sb->s_blocksize - offset <
2127 toread ? sb->s_blocksize - offset : toread;
2128 tmp_bh.b_state = 0;
2129 /* Quota files are without tails so we can safely use this function */
2130 reiserfs_write_lock(sb);
2131 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2132 reiserfs_write_unlock(sb);
2133 if (err)
2134 return err;
2135 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2136 memset(data, 0, tocopy);
2137 else {
2138 bh = sb_bread(sb, tmp_bh.b_blocknr);
2139 if (!bh)
2140 return -EIO;
2141 memcpy(data, bh->b_data + offset, tocopy);
2142 brelse(bh);
2143 }
2144 offset = 0;
2145 toread -= tocopy;
2146 data += tocopy;
2147 blk++;
2148 }
2149 return len;
2150 }
2151
2152 /* Write to quotafile (we know the transaction is already started and has
2153 * enough credits) */
2154 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2155 const char *data, size_t len, loff_t off)
2156 {
2157 struct inode *inode = sb_dqopt(sb)->files[type];
2158 unsigned long blk = off >> sb->s_blocksize_bits;
2159 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2160 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2161 size_t towrite = len;
2162 struct buffer_head tmp_bh, *bh;
2163
2164 if (!current->journal_info) {
2165 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2166 " cancelled because transaction is not started.\n",
2167 (unsigned long long)off, (unsigned long long)len);
2168 return -EIO;
2169 }
2170 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2171 while (towrite > 0) {
2172 tocopy = sb->s_blocksize - offset < towrite ?
2173 sb->s_blocksize - offset : towrite;
2174 tmp_bh.b_state = 0;
2175 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2176 if (err)
2177 goto out;
2178 if (offset || tocopy != sb->s_blocksize)
2179 bh = sb_bread(sb, tmp_bh.b_blocknr);
2180 else
2181 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2182 if (!bh) {
2183 err = -EIO;
2184 goto out;
2185 }
2186 lock_buffer(bh);
2187 memcpy(bh->b_data + offset, data, tocopy);
2188 flush_dcache_page(bh->b_page);
2189 set_buffer_uptodate(bh);
2190 unlock_buffer(bh);
2191 reiserfs_prepare_for_journal(sb, bh, 1);
2192 journal_mark_dirty(current->journal_info, sb, bh);
2193 if (!journal_quota)
2194 reiserfs_add_ordered_list(inode, bh);
2195 brelse(bh);
2196 offset = 0;
2197 towrite -= tocopy;
2198 data += tocopy;
2199 blk++;
2200 }
2201 out:
2202 if (len == towrite) {
2203 mutex_unlock(&inode->i_mutex);
2204 return err;
2205 }
2206 if (inode->i_size < off + len - towrite)
2207 i_size_write(inode, off + len - towrite);
2208 inode->i_version++;
2209 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2210 mark_inode_dirty(inode);
2211 mutex_unlock(&inode->i_mutex);
2212 return len - towrite;
2213 }
2214
2215 #endif
2216
2217 static struct dentry *get_super_block(struct file_system_type *fs_type,
2218 int flags, const char *dev_name,
2219 void *data)
2220 {
2221 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2222 }
2223
2224 static int __init init_reiserfs_fs(void)
2225 {
2226 int ret;
2227
2228 if ((ret = init_inodecache())) {
2229 return ret;
2230 }
2231
2232 reiserfs_proc_info_global_init();
2233
2234 ret = register_filesystem(&reiserfs_fs_type);
2235
2236 if (ret == 0) {
2237 return 0;
2238 }
2239
2240 reiserfs_proc_info_global_done();
2241 destroy_inodecache();
2242
2243 return ret;
2244 }
2245
2246 static void __exit exit_reiserfs_fs(void)
2247 {
2248 reiserfs_proc_info_global_done();
2249 unregister_filesystem(&reiserfs_fs_type);
2250 destroy_inodecache();
2251 }
2252
2253 struct file_system_type reiserfs_fs_type = {
2254 .owner = THIS_MODULE,
2255 .name = "reiserfs",
2256 .mount = get_super_block,
2257 .kill_sb = reiserfs_kill_sb,
2258 .fs_flags = FS_REQUIRES_DEV,
2259 };
2260
2261 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2262 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2263 MODULE_LICENSE("GPL");
2264
2265 module_init(init_reiserfs_fs);
2266 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree