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powerpc/pmac: Add missing unlocks in error path
[linux-2.6/next.git] / fs / reiserfs / super.c
blob59125fb36d42482fd8fc3b6cfc9d63576890ca8e
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
19 #include <linux/reiserfs_fs.h>
20 #include <linux/reiserfs_acl.h>
21 #include <linux/reiserfs_xattr.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/smp_lock.h>
32
33 struct file_system_type reiserfs_fs_type;
34
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42 strlen(reiserfs_3_5_magic_string));
43 }
44
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48 strlen(reiserfs_3_6_magic_string));
49 }
50
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54 strlen(reiserfs_jr_magic_string));
55 }
56
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60 is_reiserfs_jr(rs));
61 }
62
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68 struct reiserfs_transaction_handle th;
69
70 reiserfs_write_lock(s);
71 if (!journal_begin(&th, s, 1))
72 if (!journal_end_sync(&th, s, 1))
73 reiserfs_flush_old_commits(s);
74 s->s_dirt = 0; /* Even if it's not true.
75 * We'll loop forever in sync_supers otherwise */
76 reiserfs_write_unlock(s);
77 return 0;
78 }
79
80 static void reiserfs_write_super(struct super_block *s)
81 {
82 reiserfs_sync_fs(s, 1);
83 }
84
85 static int reiserfs_freeze(struct super_block *s)
86 {
87 struct reiserfs_transaction_handle th;
88 reiserfs_write_lock(s);
89 if (!(s->s_flags & MS_RDONLY)) {
90 int err = journal_begin(&th, s, 1);
91 if (err) {
92 reiserfs_block_writes(&th);
93 } else {
94 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
95 1);
96 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
97 reiserfs_block_writes(&th);
98 journal_end_sync(&th, s, 1);
99 }
100 }
101 s->s_dirt = 0;
102 reiserfs_write_unlock(s);
103 return 0;
104 }
105
106 static int reiserfs_unfreeze(struct super_block *s)
107 {
108 reiserfs_allow_writes(s);
109 return 0;
110 }
111
112 extern const struct in_core_key MAX_IN_CORE_KEY;
113
114 /* this is used to delete "save link" when there are no items of a
115 file it points to. It can either happen if unlink is completed but
116 "save unlink" removal, or if file has both unlink and truncate
117 pending and as unlink completes first (because key of "save link"
118 protecting unlink is bigger that a key lf "save link" which
119 protects truncate), so there left no items to make truncate
120 completion on */
121 static int remove_save_link_only(struct super_block *s,
122 struct reiserfs_key *key, int oid_free)
123 {
124 struct reiserfs_transaction_handle th;
125 int err;
126
127 /* we are going to do one balancing */
128 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
129 if (err)
130 return err;
131
132 reiserfs_delete_solid_item(&th, NULL, key);
133 if (oid_free)
134 /* removals are protected by direct items */
135 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
136
137 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
138 }
139
140 #ifdef CONFIG_QUOTA
141 static int reiserfs_quota_on_mount(struct super_block *, int);
142 #endif
143
144 /* look for uncompleted unlinks and truncates and complete them */
145 static int finish_unfinished(struct super_block *s)
146 {
147 INITIALIZE_PATH(path);
148 struct cpu_key max_cpu_key, obj_key;
149 struct reiserfs_key save_link_key, last_inode_key;
150 int retval = 0;
151 struct item_head *ih;
152 struct buffer_head *bh;
153 int item_pos;
154 char *item;
155 int done;
156 struct inode *inode;
157 int truncate;
158 #ifdef CONFIG_QUOTA
159 int i;
160 int ms_active_set;
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 if (REISERFS_SB(s)->s_qf_names[i]) {
183 int ret = reiserfs_quota_on_mount(s, i);
184 if (ret < 0)
185 reiserfs_warning(s, "reiserfs-2500",
186 "cannot turn on journaled "
187 "quota: error %d", ret);
188 }
189 }
190 #endif
191
192 done = 0;
193 REISERFS_SB(s)->s_is_unlinked_ok = 1;
194 while (!retval) {
195 retval = search_item(s, &max_cpu_key, &path);
196 if (retval != ITEM_NOT_FOUND) {
197 reiserfs_error(s, "vs-2140",
198 "search_by_key returned %d", retval);
199 break;
200 }
201
202 bh = get_last_bh(&path);
203 item_pos = get_item_pos(&path);
204 if (item_pos != B_NR_ITEMS(bh)) {
205 reiserfs_warning(s, "vs-2060",
206 "wrong position found");
207 break;
208 }
209 item_pos--;
210 ih = B_N_PITEM_HEAD(bh, item_pos);
211
212 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
213 /* there are no "save" links anymore */
214 break;
215
216 save_link_key = ih->ih_key;
217 if (is_indirect_le_ih(ih))
218 truncate = 1;
219 else
220 truncate = 0;
221
222 /* reiserfs_iget needs k_dirid and k_objectid only */
223 item = B_I_PITEM(bh, ih);
224 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
225 obj_key.on_disk_key.k_objectid =
226 le32_to_cpu(ih->ih_key.k_objectid);
227 obj_key.on_disk_key.k_offset = 0;
228 obj_key.on_disk_key.k_type = 0;
229
230 pathrelse(&path);
231
232 inode = reiserfs_iget(s, &obj_key);
233 if (!inode) {
234 /* the unlink almost completed, it just did not manage to remove
235 "save" link and release objectid */
236 reiserfs_warning(s, "vs-2180", "iget failed for %K",
237 &obj_key);
238 retval = remove_save_link_only(s, &save_link_key, 1);
239 continue;
240 }
241
242 if (!truncate && inode->i_nlink) {
243 /* file is not unlinked */
244 reiserfs_warning(s, "vs-2185",
245 "file %K is not unlinked",
246 &obj_key);
247 retval = remove_save_link_only(s, &save_link_key, 0);
248 continue;
249 }
250 dquot_initialize(inode);
251
252 if (truncate && S_ISDIR(inode->i_mode)) {
253 /* We got a truncate request for a dir which is impossible.
254 The only imaginable way is to execute unfinished truncate request
255 then boot into old kernel, remove the file and create dir with
256 the same key. */
257 reiserfs_warning(s, "green-2101",
258 "impossible truncate on a "
259 "directory %k. Please report",
260 INODE_PKEY(inode));
261 retval = remove_save_link_only(s, &save_link_key, 0);
262 truncate = 0;
263 iput(inode);
264 continue;
265 }
266
267 if (truncate) {
268 REISERFS_I(inode)->i_flags |=
269 i_link_saved_truncate_mask;
270 /* not completed truncate found. New size was committed together
271 with "save" link */
272 reiserfs_info(s, "Truncating %k to %Ld ..",
273 INODE_PKEY(inode), inode->i_size);
274 reiserfs_truncate_file(inode,
275 0
276 /*don't update modification time */
277 );
278 retval = remove_save_link(inode, truncate);
279 } else {
280 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
281 /* not completed unlink (rmdir) found */
282 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
283 if (memcmp(&last_inode_key, INODE_PKEY(inode),
284 sizeof(last_inode_key))){
285 last_inode_key = *INODE_PKEY(inode);
286 /* removal gets completed in iput */
287 retval = 0;
288 } else {
289 reiserfs_warning(s, "super-2189", "Dead loop "
290 "in finish_unfinished "
291 "detected, just remove "
292 "save link\n");
293 retval = remove_save_link_only(s,
294 &save_link_key, 0);
295 }
296 }
297
298 iput(inode);
299 printk("done\n");
300 done++;
301 }
302 REISERFS_SB(s)->s_is_unlinked_ok = 0;
303
304 #ifdef CONFIG_QUOTA
305 /* Turn quotas off */
306 for (i = 0; i < MAXQUOTAS; i++) {
307 if (sb_dqopt(s)->files[i])
308 vfs_quota_off(s, i, 0);
309 }
310 if (ms_active_set)
311 /* Restore the flag back */
312 s->s_flags &= ~MS_ACTIVE;
313 #endif
314 pathrelse(&path);
315 if (done)
316 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
317 "Completed\n", done);
318 return retval;
319 }
320
321 /* to protect file being unlinked from getting lost we "safe" link files
322 being unlinked. This link will be deleted in the same transaction with last
323 item of file. mounting the filesystem we scan all these links and remove
324 files which almost got lost */
325 void add_save_link(struct reiserfs_transaction_handle *th,
326 struct inode *inode, int truncate)
327 {
328 INITIALIZE_PATH(path);
329 int retval;
330 struct cpu_key key;
331 struct item_head ih;
332 __le32 link;
333
334 BUG_ON(!th->t_trans_id);
335
336 /* file can only get one "save link" of each kind */
337 RFALSE(truncate &&
338 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
339 "saved link already exists for truncated inode %lx",
340 (long)inode->i_ino);
341 RFALSE(!truncate &&
342 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
343 "saved link already exists for unlinked inode %lx",
344 (long)inode->i_ino);
345
346 /* setup key of "save" link */
347 key.version = KEY_FORMAT_3_5;
348 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
349 key.on_disk_key.k_objectid = inode->i_ino;
350 if (!truncate) {
351 /* unlink, rmdir, rename */
352 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
353 set_cpu_key_k_type(&key, TYPE_DIRECT);
354
355 /* item head of "safe" link */
356 make_le_item_head(&ih, &key, key.version,
357 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
358 4 /*length */ , 0xffff /*free space */ );
359 } else {
360 /* truncate */
361 if (S_ISDIR(inode->i_mode))
362 reiserfs_warning(inode->i_sb, "green-2102",
363 "Adding a truncate savelink for "
364 "a directory %k! Please report",
365 INODE_PKEY(inode));
366 set_cpu_key_k_offset(&key, 1);
367 set_cpu_key_k_type(&key, TYPE_INDIRECT);
368
369 /* item head of "safe" link */
370 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
371 4 /*length */ , 0 /*free space */ );
372 }
373 key.key_length = 3;
374
375 /* look for its place in the tree */
376 retval = search_item(inode->i_sb, &key, &path);
377 if (retval != ITEM_NOT_FOUND) {
378 if (retval != -ENOSPC)
379 reiserfs_error(inode->i_sb, "vs-2100",
380 "search_by_key (%K) returned %d", &key,
381 retval);
382 pathrelse(&path);
383 return;
384 }
385
386 /* body of "save" link */
387 link = INODE_PKEY(inode)->k_dir_id;
388
389 /* put "save" link inot tree, don't charge quota to anyone */
390 retval =
391 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
392 if (retval) {
393 if (retval != -ENOSPC)
394 reiserfs_error(inode->i_sb, "vs-2120",
395 "insert_item returned %d", retval);
396 } else {
397 if (truncate)
398 REISERFS_I(inode)->i_flags |=
399 i_link_saved_truncate_mask;
400 else
401 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
402 }
403 }
404
405 /* this opens transaction unlike add_save_link */
406 int remove_save_link(struct inode *inode, int truncate)
407 {
408 struct reiserfs_transaction_handle th;
409 struct reiserfs_key key;
410 int err;
411
412 /* we are going to do one balancing only */
413 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
414 if (err)
415 return err;
416
417 /* setup key of "save" link */
418 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
419 key.k_objectid = INODE_PKEY(inode)->k_objectid;
420 if (!truncate) {
421 /* unlink, rmdir, rename */
422 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
423 1 + inode->i_sb->s_blocksize);
424 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
425 } else {
426 /* truncate */
427 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
428 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
429 }
430
431 if ((truncate &&
432 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
433 (!truncate &&
434 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
435 /* don't take quota bytes from anywhere */
436 reiserfs_delete_solid_item(&th, NULL, &key);
437 if (!truncate) {
438 reiserfs_release_objectid(&th, inode->i_ino);
439 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
440 } else
441 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
442
443 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
444 }
445
446 static void reiserfs_kill_sb(struct super_block *s)
447 {
448 if (REISERFS_SB(s)) {
449 if (REISERFS_SB(s)->xattr_root) {
450 d_invalidate(REISERFS_SB(s)->xattr_root);
451 dput(REISERFS_SB(s)->xattr_root);
452 REISERFS_SB(s)->xattr_root = NULL;
453 }
454 if (REISERFS_SB(s)->priv_root) {
455 d_invalidate(REISERFS_SB(s)->priv_root);
456 dput(REISERFS_SB(s)->priv_root);
457 REISERFS_SB(s)->priv_root = NULL;
458 }
459 }
460
461 kill_block_super(s);
462 }
463
464 static void reiserfs_put_super(struct super_block *s)
465 {
466 struct reiserfs_transaction_handle th;
467 th.t_trans_id = 0;
468
469 reiserfs_write_lock(s);
470
471 if (s->s_dirt)
472 reiserfs_write_super(s);
473
474 /* change file system state to current state if it was mounted with read-write permissions */
475 if (!(s->s_flags & MS_RDONLY)) {
476 if (!journal_begin(&th, s, 10)) {
477 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
478 1);
479 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
480 REISERFS_SB(s)->s_mount_state);
481 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
482 }
483 }
484
485 /* note, journal_release checks for readonly mount, and can decide not
486 ** to do a journal_end
487 */
488 journal_release(&th, s);
489
490 reiserfs_free_bitmap_cache(s);
491
492 brelse(SB_BUFFER_WITH_SB(s));
493
494 print_statistics(s);
495
496 if (REISERFS_SB(s)->reserved_blocks != 0) {
497 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
498 REISERFS_SB(s)->reserved_blocks);
499 }
500
501 reiserfs_proc_info_done(s);
502
503 reiserfs_write_unlock(s);
504 mutex_destroy(&REISERFS_SB(s)->lock);
505 kfree(s->s_fs_info);
506 s->s_fs_info = NULL;
507 }
508
509 static struct kmem_cache *reiserfs_inode_cachep;
510
511 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
512 {
513 struct reiserfs_inode_info *ei;
514 ei = (struct reiserfs_inode_info *)
515 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
516 if (!ei)
517 return NULL;
518 return &ei->vfs_inode;
519 }
520
521 static void reiserfs_destroy_inode(struct inode *inode)
522 {
523 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
524 }
525
526 static void init_once(void *foo)
527 {
528 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
529
530 INIT_LIST_HEAD(&ei->i_prealloc_list);
531 inode_init_once(&ei->vfs_inode);
532 }
533
534 static int init_inodecache(void)
535 {
536 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
537 sizeof(struct
538 reiserfs_inode_info),
539 0, (SLAB_RECLAIM_ACCOUNT|
540 SLAB_MEM_SPREAD),
541 init_once);
542 if (reiserfs_inode_cachep == NULL)
543 return -ENOMEM;
544 return 0;
545 }
546
547 static void destroy_inodecache(void)
548 {
549 kmem_cache_destroy(reiserfs_inode_cachep);
550 }
551
552 /* we don't mark inodes dirty, we just log them */
553 static void reiserfs_dirty_inode(struct inode *inode)
554 {
555 struct reiserfs_transaction_handle th;
556
557 int err = 0;
558 int lock_depth;
559
560 if (inode->i_sb->s_flags & MS_RDONLY) {
561 reiserfs_warning(inode->i_sb, "clm-6006",
562 "writing inode %lu on readonly FS",
563 inode->i_ino);
564 return;
565 }
566 lock_depth = reiserfs_write_lock_once(inode->i_sb);
567
568 /* this is really only used for atime updates, so they don't have
569 ** to be included in O_SYNC or fsync
570 */
571 err = journal_begin(&th, inode->i_sb, 1);
572 if (err)
573 goto out;
574
575 reiserfs_update_sd(&th, inode);
576 journal_end(&th, inode->i_sb, 1);
577
578 out:
579 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
580 }
581
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584 dquot_drop(inode);
585 }
586
587 #ifdef CONFIG_QUOTA
588 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
589 size_t, loff_t);
590 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
591 loff_t);
592 #endif
593
594 static const struct super_operations reiserfs_sops = {
595 .alloc_inode = reiserfs_alloc_inode,
596 .destroy_inode = reiserfs_destroy_inode,
597 .write_inode = reiserfs_write_inode,
598 .dirty_inode = reiserfs_dirty_inode,
599 .clear_inode = reiserfs_clear_inode,
600 .delete_inode = reiserfs_delete_inode,
601 .put_super = reiserfs_put_super,
602 .write_super = reiserfs_write_super,
603 .sync_fs = reiserfs_sync_fs,
604 .freeze_fs = reiserfs_freeze,
605 .unfreeze_fs = reiserfs_unfreeze,
606 .statfs = reiserfs_statfs,
607 .remount_fs = reiserfs_remount,
608 .show_options = generic_show_options,
609 #ifdef CONFIG_QUOTA
610 .quota_read = reiserfs_quota_read,
611 .quota_write = reiserfs_quota_write,
612 #endif
613 };
614
615 #ifdef CONFIG_QUOTA
616 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
617
618 static int reiserfs_write_dquot(struct dquot *);
619 static int reiserfs_acquire_dquot(struct dquot *);
620 static int reiserfs_release_dquot(struct dquot *);
621 static int reiserfs_mark_dquot_dirty(struct dquot *);
622 static int reiserfs_write_info(struct super_block *, int);
623 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
624
625 static const struct dquot_operations reiserfs_quota_operations = {
626 .write_dquot = reiserfs_write_dquot,
627 .acquire_dquot = reiserfs_acquire_dquot,
628 .release_dquot = reiserfs_release_dquot,
629 .mark_dirty = reiserfs_mark_dquot_dirty,
630 .write_info = reiserfs_write_info,
631 .alloc_dquot = dquot_alloc,
632 .destroy_dquot = dquot_destroy,
633 };
634
635 static const struct quotactl_ops reiserfs_qctl_operations = {
636 .quota_on = reiserfs_quota_on,
637 .quota_off = vfs_quota_off,
638 .quota_sync = vfs_quota_sync,
639 .get_info = vfs_get_dqinfo,
640 .set_info = vfs_set_dqinfo,
641 .get_dqblk = vfs_get_dqblk,
642 .set_dqblk = vfs_set_dqblk,
643 };
644 #endif
645
646 static const struct export_operations reiserfs_export_ops = {
647 .encode_fh = reiserfs_encode_fh,
648 .fh_to_dentry = reiserfs_fh_to_dentry,
649 .fh_to_parent = reiserfs_fh_to_parent,
650 .get_parent = reiserfs_get_parent,
651 };
652
653 /* this struct is used in reiserfs_getopt () for containing the value for those
654 mount options that have values rather than being toggles. */
655 typedef struct {
656 char *value;
657 int setmask; /* bitmask which is to set on mount_options bitmask when this
658 value is found, 0 is no bits are to be changed. */
659 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
660 value is found, 0 is no bits are to be changed. This is
661 applied BEFORE setmask */
662 } arg_desc_t;
663
664 /* Set this bit in arg_required to allow empty arguments */
665 #define REISERFS_OPT_ALLOWEMPTY 31
666
667 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
668 mount options */
669 typedef struct {
670 char *option_name;
671 int arg_required; /* 0 if argument is not required, not 0 otherwise */
672 const arg_desc_t *values; /* list of values accepted by an option */
673 int setmask; /* bitmask which is to set on mount_options bitmask when this
674 value is found, 0 is no bits are to be changed. */
675 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
676 value is found, 0 is no bits are to be changed. This is
677 applied BEFORE setmask */
678 } opt_desc_t;
679
680 /* possible values for -o data= */
681 static const arg_desc_t logging_mode[] = {
682 {"ordered", 1 << REISERFS_DATA_ORDERED,
683 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
684 {"journal", 1 << REISERFS_DATA_LOG,
685 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
686 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
687 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
688 {.value = NULL}
689 };
690
691 /* possible values for -o barrier= */
692 static const arg_desc_t barrier_mode[] = {
693 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
694 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
695 {.value = NULL}
696 };
697
698 /* possible values for "-o block-allocator=" and bits which are to be set in
699 s_mount_opt of reiserfs specific part of in-core super block */
700 static const arg_desc_t balloc[] = {
701 {"noborder", 1 << REISERFS_NO_BORDER, 0},
702 {"border", 0, 1 << REISERFS_NO_BORDER},
703 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
704 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
705 {"test4", 1 << REISERFS_TEST4, 0},
706 {"notest4", 0, 1 << REISERFS_TEST4},
707 {NULL, 0, 0}
708 };
709
710 static const arg_desc_t tails[] = {
711 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
712 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
713 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
714 {NULL, 0, 0}
715 };
716
717 static const arg_desc_t error_actions[] = {
718 {"panic", 1 << REISERFS_ERROR_PANIC,
719 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
720 {"ro-remount", 1 << REISERFS_ERROR_RO,
721 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
722 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
723 {"continue", 1 << REISERFS_ERROR_CONTINUE,
724 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
725 #endif
726 {NULL, 0, 0},
727 };
728
729 /* proceed only one option from a list *cur - string containing of mount options
730 opts - array of options which are accepted
731 opt_arg - if option is found and requires an argument and if it is specifed
732 in the input - pointer to the argument is stored here
733 bit_flags - if option requires to set a certain bit - it is set here
734 return -1 if unknown option is found, opt->arg_required otherwise */
735 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
736 char **opt_arg, unsigned long *bit_flags)
737 {
738 char *p;
739 /* foo=bar,
740 ^ ^ ^
741 | | +-- option_end
742 | +-- arg_start
743 +-- option_start
744 */
745 const opt_desc_t *opt;
746 const arg_desc_t *arg;
747
748 p = *cur;
749
750 /* assume argument cannot contain commas */
751 *cur = strchr(p, ',');
752 if (*cur) {
753 *(*cur) = '\0';
754 (*cur)++;
755 }
756
757 if (!strncmp(p, "alloc=", 6)) {
758 /* Ugly special case, probably we should redo options parser so that
759 it can understand several arguments for some options, also so that
760 it can fill several bitfields with option values. */
761 if (reiserfs_parse_alloc_options(s, p + 6)) {
762 return -1;
763 } else {
764 return 0;
765 }
766 }
767
768 /* for every option in the list */
769 for (opt = opts; opt->option_name; opt++) {
770 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
771 if (bit_flags) {
772 if (opt->clrmask ==
773 (1 << REISERFS_UNSUPPORTED_OPT))
774 reiserfs_warning(s, "super-6500",
775 "%s not supported.\n",
776 p);
777 else
778 *bit_flags &= ~opt->clrmask;
779 if (opt->setmask ==
780 (1 << REISERFS_UNSUPPORTED_OPT))
781 reiserfs_warning(s, "super-6501",
782 "%s not supported.\n",
783 p);
784 else
785 *bit_flags |= opt->setmask;
786 }
787 break;
788 }
789 }
790 if (!opt->option_name) {
791 reiserfs_warning(s, "super-6502",
792 "unknown mount option \"%s\"", p);
793 return -1;
794 }
795
796 p += strlen(opt->option_name);
797 switch (*p) {
798 case '=':
799 if (!opt->arg_required) {
800 reiserfs_warning(s, "super-6503",
801 "the option \"%s\" does not "
802 "require an argument\n",
803 opt->option_name);
804 return -1;
805 }
806 break;
807
808 case 0:
809 if (opt->arg_required) {
810 reiserfs_warning(s, "super-6504",
811 "the option \"%s\" requires an "
812 "argument\n", opt->option_name);
813 return -1;
814 }
815 break;
816 default:
817 reiserfs_warning(s, "super-6505",
818 "head of option \"%s\" is only correct\n",
819 opt->option_name);
820 return -1;
821 }
822
823 /* move to the argument, or to next option if argument is not required */
824 p++;
825
826 if (opt->arg_required
827 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828 && !strlen(p)) {
829 /* this catches "option=," if not allowed */
830 reiserfs_warning(s, "super-6506",
831 "empty argument for \"%s\"\n",
832 opt->option_name);
833 return -1;
834 }
835
836 if (!opt->values) {
837 /* *=NULLopt_arg contains pointer to argument */
838 *opt_arg = p;
839 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840 }
841
842 /* values possible for this option are listed in opt->values */
843 for (arg = opt->values; arg->value; arg++) {
844 if (!strcmp(p, arg->value)) {
845 if (bit_flags) {
846 *bit_flags &= ~arg->clrmask;
847 *bit_flags |= arg->setmask;
848 }
849 return opt->arg_required;
850 }
851 }
852
853 reiserfs_warning(s, "super-6506",
854 "bad value \"%s\" for option \"%s\"\n", p,
855 opt->option_name);
856 return -1;
857 }
858
859 /* returns 0 if something is wrong in option string, 1 - otherwise */
860 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
861 unsigned long *mount_options,
862 /* after the parsing phase, contains the
863 collection of bitflags defining what
864 mount options were selected. */
865 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
866 char **jdev_name,
867 unsigned int *commit_max_age,
868 char **qf_names,
869 unsigned int *qfmt)
870 {
871 int c;
872 char *arg = NULL;
873 char *pos;
874 opt_desc_t opts[] = {
875 /* Compatibility stuff, so that -o notail for old setups still work */
876 {"tails",.arg_required = 't',.values = tails},
877 {"notail",.clrmask =
878 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
879 {"conv",.setmask = 1 << REISERFS_CONVERT},
880 {"attrs",.setmask = 1 << REISERFS_ATTRS},
881 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
882 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
883 #ifdef CONFIG_REISERFS_FS_XATTR
884 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
885 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
886 #else
887 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
888 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
889 #endif
890 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
891 {"acl",.setmask = 1 << REISERFS_POSIXACL},
892 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
893 #else
894 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
895 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
896 #endif
897 {.option_name = "nolog"},
898 {"replayonly",.setmask = 1 << REPLAYONLY},
899 {"block-allocator",.arg_required = 'a',.values = balloc},
900 {"data",.arg_required = 'd',.values = logging_mode},
901 {"barrier",.arg_required = 'b',.values = barrier_mode},
902 {"resize",.arg_required = 'r',.values = NULL},
903 {"jdev",.arg_required = 'j',.values = NULL},
904 {"nolargeio",.arg_required = 'w',.values = NULL},
905 {"commit",.arg_required = 'c',.values = NULL},
906 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
907 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
908 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
909 {"errors",.arg_required = 'e',.values = error_actions},
910 {"usrjquota",.arg_required =
911 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912 {"grpjquota",.arg_required =
913 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
914 {"jqfmt",.arg_required = 'f',.values = NULL},
915 {.option_name = NULL}
916 };
917
918 *blocks = 0;
919 if (!options || !*options)
920 /* use default configuration: create tails, journaling on, no
921 conversion to newest format */
922 return 1;
923
924 for (pos = options; pos;) {
925 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
926 if (c == -1)
927 /* wrong option is given */
928 return 0;
929
930 if (c == 'r') {
931 char *p;
932
933 p = NULL;
934 /* "resize=NNN" or "resize=auto" */
935
936 if (!strcmp(arg, "auto")) {
937 /* From JFS code, to auto-get the size. */
938 *blocks =
939 s->s_bdev->bd_inode->i_size >> s->
940 s_blocksize_bits;
941 } else {
942 *blocks = simple_strtoul(arg, &p, 0);
943 if (*p != '\0') {
944 /* NNN does not look like a number */
945 reiserfs_warning(s, "super-6507",
946 "bad value %s for "
947 "-oresize\n", arg);
948 return 0;
949 }
950 }
951 }
952
953 if (c == 'c') {
954 char *p = NULL;
955 unsigned long val = simple_strtoul(arg, &p, 0);
956 /* commit=NNN (time in seconds) */
957 if (*p != '\0' || val >= (unsigned int)-1) {
958 reiserfs_warning(s, "super-6508",
959 "bad value %s for -ocommit\n",
960 arg);
961 return 0;
962 }
963 *commit_max_age = (unsigned int)val;
964 }
965
966 if (c == 'w') {
967 reiserfs_warning(s, "super-6509", "nolargeio option "
968 "is no longer supported");
969 return 0;
970 }
971
972 if (c == 'j') {
973 if (arg && *arg && jdev_name) {
974 if (*jdev_name) { //Hm, already assigned?
975 reiserfs_warning(s, "super-6510",
976 "journal device was "
977 "already specified to "
978 "be %s", *jdev_name);
979 return 0;
980 }
981 *jdev_name = arg;
982 }
983 }
984 #ifdef CONFIG_QUOTA
985 if (c == 'u' || c == 'g') {
986 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
987
988 if (sb_any_quota_loaded(s) &&
989 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
990 reiserfs_warning(s, "super-6511",
991 "cannot change journaled "
992 "quota options when quota "
993 "turned on.");
994 return 0;
995 }
996 if (*arg) { /* Some filename specified? */
997 if (REISERFS_SB(s)->s_qf_names[qtype]
998 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
999 arg)) {
1000 reiserfs_warning(s, "super-6512",
1001 "%s quota file "
1002 "already specified.",
1003 QTYPE2NAME(qtype));
1004 return 0;
1005 }
1006 if (strchr(arg, '/')) {
1007 reiserfs_warning(s, "super-6513",
1008 "quotafile must be "
1009 "on filesystem root.");
1010 return 0;
1011 }
1012 qf_names[qtype] =
1013 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1014 if (!qf_names[qtype]) {
1015 reiserfs_warning(s, "reiserfs-2502",
1016 "not enough memory "
1017 "for storing "
1018 "quotafile name.");
1019 return 0;
1020 }
1021 strcpy(qf_names[qtype], arg);
1022 *mount_options |= 1 << REISERFS_QUOTA;
1023 } else {
1024 if (qf_names[qtype] !=
1025 REISERFS_SB(s)->s_qf_names[qtype])
1026 kfree(qf_names[qtype]);
1027 qf_names[qtype] = NULL;
1028 }
1029 }
1030 if (c == 'f') {
1031 if (!strcmp(arg, "vfsold"))
1032 *qfmt = QFMT_VFS_OLD;
1033 else if (!strcmp(arg, "vfsv0"))
1034 *qfmt = QFMT_VFS_V0;
1035 else {
1036 reiserfs_warning(s, "super-6514",
1037 "unknown quota format "
1038 "specified.");
1039 return 0;
1040 }
1041 if (sb_any_quota_loaded(s) &&
1042 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1043 reiserfs_warning(s, "super-6515",
1044 "cannot change journaled "
1045 "quota options when quota "
1046 "turned on.");
1047 return 0;
1048 }
1049 }
1050 #else
1051 if (c == 'u' || c == 'g' || c == 'f') {
1052 reiserfs_warning(s, "reiserfs-2503", "journaled "
1053 "quota options not supported.");
1054 return 0;
1055 }
1056 #endif
1057 }
1058
1059 #ifdef CONFIG_QUOTA
1060 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1061 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1062 reiserfs_warning(s, "super-6515",
1063 "journaled quota format not specified.");
1064 return 0;
1065 }
1066 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1067 if (!(*mount_options & (1 << REISERFS_QUOTA))
1068 && sb_any_quota_loaded(s)) {
1069 reiserfs_warning(s, "super-6516", "quota options must "
1070 "be present when quota is turned on.");
1071 return 0;
1072 }
1073 #endif
1074
1075 return 1;
1076 }
1077
1078 static void switch_data_mode(struct super_block *s, unsigned long mode)
1079 {
1080 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1081 (1 << REISERFS_DATA_ORDERED) |
1082 (1 << REISERFS_DATA_WRITEBACK));
1083 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1084 }
1085
1086 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1087 {
1088 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1089 if (!reiserfs_data_log(s)) {
1090 switch_data_mode(s, REISERFS_DATA_LOG);
1091 reiserfs_info(s, "switching to journaled data mode\n");
1092 }
1093 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1094 if (!reiserfs_data_ordered(s)) {
1095 switch_data_mode(s, REISERFS_DATA_ORDERED);
1096 reiserfs_info(s, "switching to ordered data mode\n");
1097 }
1098 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1099 if (!reiserfs_data_writeback(s)) {
1100 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1101 reiserfs_info(s, "switching to writeback data mode\n");
1102 }
1103 }
1104 }
1105
1106 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1107 {
1108 int flush = (1 << REISERFS_BARRIER_FLUSH);
1109 int none = (1 << REISERFS_BARRIER_NONE);
1110 int all_barrier = flush | none;
1111
1112 if (bits & all_barrier) {
1113 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1114 if (bits & flush) {
1115 REISERFS_SB(s)->s_mount_opt |= flush;
1116 printk("reiserfs: enabling write barrier flush mode\n");
1117 } else if (bits & none) {
1118 REISERFS_SB(s)->s_mount_opt |= none;
1119 printk("reiserfs: write barriers turned off\n");
1120 }
1121 }
1122 }
1123
1124 static void handle_attrs(struct super_block *s)
1125 {
1126 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1127
1128 if (reiserfs_attrs(s)) {
1129 if (old_format_only(s)) {
1130 reiserfs_warning(s, "super-6517", "cannot support "
1131 "attributes on 3.5.x disk format");
1132 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1133 return;
1134 }
1135 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1136 reiserfs_warning(s, "super-6518", "cannot support "
1137 "attributes until flag is set in "
1138 "super-block");
1139 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1140 }
1141 }
1142 }
1143
1144 #ifdef CONFIG_QUOTA
1145 static void handle_quota_files(struct super_block *s, char **qf_names,
1146 unsigned int *qfmt)
1147 {
1148 int i;
1149
1150 for (i = 0; i < MAXQUOTAS; i++) {
1151 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1152 kfree(REISERFS_SB(s)->s_qf_names[i]);
1153 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1154 }
1155 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1156 }
1157 #endif
1158
1159 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1160 {
1161 struct reiserfs_super_block *rs;
1162 struct reiserfs_transaction_handle th;
1163 unsigned long blocks;
1164 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1165 unsigned long safe_mask = 0;
1166 unsigned int commit_max_age = (unsigned int)-1;
1167 struct reiserfs_journal *journal = SB_JOURNAL(s);
1168 char *new_opts = kstrdup(arg, GFP_KERNEL);
1169 int err;
1170 char *qf_names[MAXQUOTAS];
1171 unsigned int qfmt = 0;
1172 #ifdef CONFIG_QUOTA
1173 int i;
1174 #endif
1175
1176 reiserfs_write_lock(s);
1177
1178 #ifdef CONFIG_QUOTA
1179 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1180 #endif
1181
1182 rs = SB_DISK_SUPER_BLOCK(s);
1183
1184 if (!reiserfs_parse_options
1185 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1186 qf_names, &qfmt)) {
1187 #ifdef CONFIG_QUOTA
1188 for (i = 0; i < MAXQUOTAS; i++)
1189 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1190 kfree(qf_names[i]);
1191 #endif
1192 err = -EINVAL;
1193 goto out_err;
1194 }
1195 #ifdef CONFIG_QUOTA
1196 handle_quota_files(s, qf_names, &qfmt);
1197 #endif
1198
1199 handle_attrs(s);
1200
1201 /* Add options that are safe here */
1202 safe_mask |= 1 << REISERFS_SMALLTAIL;
1203 safe_mask |= 1 << REISERFS_LARGETAIL;
1204 safe_mask |= 1 << REISERFS_NO_BORDER;
1205 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1206 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1207 safe_mask |= 1 << REISERFS_TEST4;
1208 safe_mask |= 1 << REISERFS_ATTRS;
1209 safe_mask |= 1 << REISERFS_XATTRS_USER;
1210 safe_mask |= 1 << REISERFS_POSIXACL;
1211 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1212 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1213 safe_mask |= 1 << REISERFS_ERROR_RO;
1214 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1215 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1216 safe_mask |= 1 << REISERFS_QUOTA;
1217
1218 /* Update the bitmask, taking care to keep
1219 * the bits we're not allowed to change here */
1220 REISERFS_SB(s)->s_mount_opt =
1221 (REISERFS_SB(s)->
1222 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1223
1224 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1225 journal->j_max_commit_age = commit_max_age;
1226 journal->j_max_trans_age = commit_max_age;
1227 } else if (commit_max_age == 0) {
1228 /* 0 means restore defaults. */
1229 journal->j_max_commit_age = journal->j_default_max_commit_age;
1230 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1231 }
1232
1233 if (blocks) {
1234 err = reiserfs_resize(s, blocks);
1235 if (err != 0)
1236 goto out_err;
1237 }
1238
1239 if (*mount_flags & MS_RDONLY) {
1240 reiserfs_xattr_init(s, *mount_flags);
1241 /* remount read-only */
1242 if (s->s_flags & MS_RDONLY)
1243 /* it is read-only already */
1244 goto out_ok;
1245 /* try to remount file system with read-only permissions */
1246 if (sb_umount_state(rs) == REISERFS_VALID_FS
1247 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1248 goto out_ok;
1249 }
1250
1251 err = journal_begin(&th, s, 10);
1252 if (err)
1253 goto out_err;
1254
1255 /* Mounting a rw partition read-only. */
1256 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1257 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1258 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1259 } else {
1260 /* remount read-write */
1261 if (!(s->s_flags & MS_RDONLY)) {
1262 reiserfs_xattr_init(s, *mount_flags);
1263 goto out_ok; /* We are read-write already */
1264 }
1265
1266 if (reiserfs_is_journal_aborted(journal)) {
1267 err = journal->j_errno;
1268 goto out_err;
1269 }
1270
1271 handle_data_mode(s, mount_options);
1272 handle_barrier_mode(s, mount_options);
1273 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1274 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1275 err = journal_begin(&th, s, 10);
1276 if (err)
1277 goto out_err;
1278
1279 /* Mount a partition which is read-only, read-write */
1280 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1281 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1282 s->s_flags &= ~MS_RDONLY;
1283 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1284 if (!old_format_only(s))
1285 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1286 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1287 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1288 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1289 }
1290 /* this will force a full flush of all journal lists */
1291 SB_JOURNAL(s)->j_must_wait = 1;
1292 err = journal_end(&th, s, 10);
1293 if (err)
1294 goto out_err;
1295 s->s_dirt = 0;
1296
1297 if (!(*mount_flags & MS_RDONLY)) {
1298 finish_unfinished(s);
1299 reiserfs_xattr_init(s, *mount_flags);
1300 }
1301
1302 out_ok:
1303 replace_mount_options(s, new_opts);
1304 reiserfs_write_unlock(s);
1305 return 0;
1306
1307 out_err:
1308 kfree(new_opts);
1309 reiserfs_write_unlock(s);
1310 return err;
1311 }
1312
1313 static int read_super_block(struct super_block *s, int offset)
1314 {
1315 struct buffer_head *bh;
1316 struct reiserfs_super_block *rs;
1317 int fs_blocksize;
1318
1319 bh = sb_bread(s, offset / s->s_blocksize);
1320 if (!bh) {
1321 reiserfs_warning(s, "sh-2006",
1322 "bread failed (dev %s, block %lu, size %lu)",
1323 reiserfs_bdevname(s), offset / s->s_blocksize,
1324 s->s_blocksize);
1325 return 1;
1326 }
1327
1328 rs = (struct reiserfs_super_block *)bh->b_data;
1329 if (!is_any_reiserfs_magic_string(rs)) {
1330 brelse(bh);
1331 return 1;
1332 }
1333 //
1334 // ok, reiserfs signature (old or new) found in at the given offset
1335 //
1336 fs_blocksize = sb_blocksize(rs);
1337 brelse(bh);
1338 sb_set_blocksize(s, fs_blocksize);
1339
1340 bh = sb_bread(s, offset / s->s_blocksize);
1341 if (!bh) {
1342 reiserfs_warning(s, "sh-2007",
1343 "bread failed (dev %s, block %lu, size %lu)",
1344 reiserfs_bdevname(s), offset / s->s_blocksize,
1345 s->s_blocksize);
1346 return 1;
1347 }
1348
1349 rs = (struct reiserfs_super_block *)bh->b_data;
1350 if (sb_blocksize(rs) != s->s_blocksize) {
1351 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1352 "filesystem on (dev %s, block %Lu, size %lu)",
1353 reiserfs_bdevname(s),
1354 (unsigned long long)bh->b_blocknr,
1355 s->s_blocksize);
1356 brelse(bh);
1357 return 1;
1358 }
1359
1360 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1361 brelse(bh);
1362 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1363 "--rebuild-tree run detected. Please run\n"
1364 "reiserfsck --rebuild-tree and wait for a "
1365 "completion. If that fails\n"
1366 "get newer reiserfsprogs package");
1367 return 1;
1368 }
1369
1370 SB_BUFFER_WITH_SB(s) = bh;
1371 SB_DISK_SUPER_BLOCK(s) = rs;
1372
1373 if (is_reiserfs_jr(rs)) {
1374 /* magic is of non-standard journal filesystem, look at s_version to
1375 find which format is in use */
1376 if (sb_version(rs) == REISERFS_VERSION_2)
1377 reiserfs_info(s, "found reiserfs format \"3.6\""
1378 " with non-standard journal\n");
1379 else if (sb_version(rs) == REISERFS_VERSION_1)
1380 reiserfs_info(s, "found reiserfs format \"3.5\""
1381 " with non-standard journal\n");
1382 else {
1383 reiserfs_warning(s, "sh-2012", "found unknown "
1384 "format \"%u\" of reiserfs with "
1385 "non-standard magic", sb_version(rs));
1386 return 1;
1387 }
1388 } else
1389 /* s_version of standard format may contain incorrect information,
1390 so we just look at the magic string */
1391 reiserfs_info(s,
1392 "found reiserfs format \"%s\" with standard journal\n",
1393 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1394
1395 s->s_op = &reiserfs_sops;
1396 s->s_export_op = &reiserfs_export_ops;
1397 #ifdef CONFIG_QUOTA
1398 s->s_qcop = &reiserfs_qctl_operations;
1399 s->dq_op = &reiserfs_quota_operations;
1400 #endif
1401
1402 /* new format is limited by the 32 bit wide i_blocks field, want to
1403 ** be one full block below that.
1404 */
1405 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1406 return 0;
1407 }
1408
1409 /* after journal replay, reread all bitmap and super blocks */
1410 static int reread_meta_blocks(struct super_block *s)
1411 {
1412 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1413 reiserfs_write_unlock(s);
1414 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1415 reiserfs_write_lock(s);
1416 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1417 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1418 return 1;
1419 }
1420
1421 return 0;
1422 }
1423
1424 /////////////////////////////////////////////////////
1425 // hash detection stuff
1426
1427 // if root directory is empty - we set default - Yura's - hash and
1428 // warn about it
1429 // FIXME: we look for only one name in a directory. If tea and yura
1430 // bith have the same value - we ask user to send report to the
1431 // mailing list
1432 static __u32 find_hash_out(struct super_block *s)
1433 {
1434 int retval;
1435 struct inode *inode;
1436 struct cpu_key key;
1437 INITIALIZE_PATH(path);
1438 struct reiserfs_dir_entry de;
1439 __u32 hash = DEFAULT_HASH;
1440
1441 inode = s->s_root->d_inode;
1442
1443 do { // Some serious "goto"-hater was there ;)
1444 u32 teahash, r5hash, yurahash;
1445
1446 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1447 retval = search_by_entry_key(s, &key, &path, &de);
1448 if (retval == IO_ERROR) {
1449 pathrelse(&path);
1450 return UNSET_HASH;
1451 }
1452 if (retval == NAME_NOT_FOUND)
1453 de.de_entry_num--;
1454 set_de_name_and_namelen(&de);
1455 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1456 /* allow override in this case */
1457 if (reiserfs_rupasov_hash(s)) {
1458 hash = YURA_HASH;
1459 }
1460 reiserfs_info(s, "FS seems to be empty, autodetect "
1461 "is using the default hash\n");
1462 break;
1463 }
1464 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1465 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1466 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1467 if (((teahash == r5hash)
1468 &&
1469 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1470 == r5hash)) || ((teahash == yurahash)
1471 && (yurahash ==
1472 GET_HASH_VALUE(deh_offset
1473 (&
1474 (de.
1475 de_deh[de.
1476 de_entry_num])))))
1477 || ((r5hash == yurahash)
1478 && (yurahash ==
1479 GET_HASH_VALUE(deh_offset
1480 (&(de.de_deh[de.de_entry_num])))))) {
1481 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1482 "automatically detect hash function. "
1483 "Please mount with -o "
1484 "hash={tea,rupasov,r5}");
1485 hash = UNSET_HASH;
1486 break;
1487 }
1488 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1489 yurahash)
1490 hash = YURA_HASH;
1491 else if (GET_HASH_VALUE
1492 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1493 hash = TEA_HASH;
1494 else if (GET_HASH_VALUE
1495 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1496 hash = R5_HASH;
1497 else {
1498 reiserfs_warning(s, "reiserfs-2506",
1499 "Unrecognised hash function");
1500 hash = UNSET_HASH;
1501 }
1502 } while (0);
1503
1504 pathrelse(&path);
1505 return hash;
1506 }
1507
1508 // finds out which hash names are sorted with
1509 static int what_hash(struct super_block *s)
1510 {
1511 __u32 code;
1512
1513 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1514
1515 /* reiserfs_hash_detect() == true if any of the hash mount options
1516 ** were used. We must check them to make sure the user isn't
1517 ** using a bad hash value
1518 */
1519 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1520 code = find_hash_out(s);
1521
1522 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1523 /* detection has found the hash, and we must check against the
1524 ** mount options
1525 */
1526 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1527 reiserfs_warning(s, "reiserfs-2507",
1528 "Error, %s hash detected, "
1529 "unable to force rupasov hash",
1530 reiserfs_hashname(code));
1531 code = UNSET_HASH;
1532 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1533 reiserfs_warning(s, "reiserfs-2508",
1534 "Error, %s hash detected, "
1535 "unable to force tea hash",
1536 reiserfs_hashname(code));
1537 code = UNSET_HASH;
1538 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1539 reiserfs_warning(s, "reiserfs-2509",
1540 "Error, %s hash detected, "
1541 "unable to force r5 hash",
1542 reiserfs_hashname(code));
1543 code = UNSET_HASH;
1544 }
1545 } else {
1546 /* find_hash_out was not called or could not determine the hash */
1547 if (reiserfs_rupasov_hash(s)) {
1548 code = YURA_HASH;
1549 } else if (reiserfs_tea_hash(s)) {
1550 code = TEA_HASH;
1551 } else if (reiserfs_r5_hash(s)) {
1552 code = R5_HASH;
1553 }
1554 }
1555
1556 /* if we are mounted RW, and we have a new valid hash code, update
1557 ** the super
1558 */
1559 if (code != UNSET_HASH &&
1560 !(s->s_flags & MS_RDONLY) &&
1561 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1562 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1563 }
1564 return code;
1565 }
1566
1567 // return pointer to appropriate function
1568 static hashf_t hash_function(struct super_block *s)
1569 {
1570 switch (what_hash(s)) {
1571 case TEA_HASH:
1572 reiserfs_info(s, "Using tea hash to sort names\n");
1573 return keyed_hash;
1574 case YURA_HASH:
1575 reiserfs_info(s, "Using rupasov hash to sort names\n");
1576 return yura_hash;
1577 case R5_HASH:
1578 reiserfs_info(s, "Using r5 hash to sort names\n");
1579 return r5_hash;
1580 }
1581 return NULL;
1582 }
1583
1584 // this is used to set up correct value for old partitions
1585 static int function2code(hashf_t func)
1586 {
1587 if (func == keyed_hash)
1588 return TEA_HASH;
1589 if (func == yura_hash)
1590 return YURA_HASH;
1591 if (func == r5_hash)
1592 return R5_HASH;
1593
1594 BUG(); // should never happen
1595
1596 return 0;
1597 }
1598
1599 #define SWARN(silent, s, id, ...) \
1600 if (!(silent)) \
1601 reiserfs_warning(s, id, __VA_ARGS__)
1602
1603 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1604 {
1605 struct inode *root_inode;
1606 struct reiserfs_transaction_handle th;
1607 int old_format = 0;
1608 unsigned long blocks;
1609 unsigned int commit_max_age = 0;
1610 int jinit_done = 0;
1611 struct reiserfs_iget_args args;
1612 struct reiserfs_super_block *rs;
1613 char *jdev_name;
1614 struct reiserfs_sb_info *sbi;
1615 int errval = -EINVAL;
1616 char *qf_names[MAXQUOTAS] = {};
1617 unsigned int qfmt = 0;
1618
1619 save_mount_options(s, data);
1620
1621 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1622 if (!sbi)
1623 return -ENOMEM;
1624 s->s_fs_info = sbi;
1625 /* Set default values for options: non-aggressive tails, RO on errors */
1626 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1627 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1628 /* no preallocation minimum, be smart in
1629 reiserfs_file_write instead */
1630 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1631 /* Preallocate by 16 blocks (17-1) at once */
1632 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1633 /* setup default block allocator options */
1634 reiserfs_init_alloc_options(s);
1635
1636 mutex_init(&REISERFS_SB(s)->lock);
1637 REISERFS_SB(s)->lock_depth = -1;
1638
1639 /*
1640 * This function is called with the bkl, which also was the old
1641 * locking used here.
1642 * do_journal_begin() will soon check if we hold the lock (ie: was the
1643 * bkl). This is likely because do_journal_begin() has several another
1644 * callers because at this time, it doesn't seem to be necessary to
1645 * protect against anything.
1646 * Anyway, let's be conservative and lock for now.
1647 */
1648 reiserfs_write_lock(s);
1649
1650 jdev_name = NULL;
1651 if (reiserfs_parse_options
1652 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1653 &commit_max_age, qf_names, &qfmt) == 0) {
1654 goto error;
1655 }
1656 #ifdef CONFIG_QUOTA
1657 handle_quota_files(s, qf_names, &qfmt);
1658 #endif
1659
1660 if (blocks) {
1661 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1662 goto error;
1663 }
1664
1665 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1666 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1667 old_format = 1;
1668 /* try new format (64-th 1k block), which can contain reiserfs super block */
1669 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1670 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1671 reiserfs_bdevname(s));
1672 goto error;
1673 }
1674
1675 rs = SB_DISK_SUPER_BLOCK(s);
1676 /* Let's do basic sanity check to verify that underlying device is not
1677 smaller than the filesystem. If the check fails then abort and scream,
1678 because bad stuff will happen otherwise. */
1679 if (s->s_bdev && s->s_bdev->bd_inode
1680 && i_size_read(s->s_bdev->bd_inode) <
1681 sb_block_count(rs) * sb_blocksize(rs)) {
1682 SWARN(silent, s, "", "Filesystem cannot be "
1683 "mounted because it is bigger than the device");
1684 SWARN(silent, s, "", "You may need to run fsck "
1685 "or increase size of your LVM partition");
1686 SWARN(silent, s, "", "Or may be you forgot to "
1687 "reboot after fdisk when it told you to");
1688 goto error;
1689 }
1690
1691 sbi->s_mount_state = SB_REISERFS_STATE(s);
1692 sbi->s_mount_state = REISERFS_VALID_FS;
1693
1694 if ((errval = reiserfs_init_bitmap_cache(s))) {
1695 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1696 goto error;
1697 }
1698 errval = -EINVAL;
1699 #ifdef CONFIG_REISERFS_CHECK
1700 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1701 SWARN(silent, s, "", "- it is slow mode for debugging.");
1702 #endif
1703
1704 /* make data=ordered the default */
1705 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1706 !reiserfs_data_writeback(s)) {
1707 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1708 }
1709
1710 if (reiserfs_data_log(s)) {
1711 reiserfs_info(s, "using journaled data mode\n");
1712 } else if (reiserfs_data_ordered(s)) {
1713 reiserfs_info(s, "using ordered data mode\n");
1714 } else {
1715 reiserfs_info(s, "using writeback data mode\n");
1716 }
1717 if (reiserfs_barrier_flush(s)) {
1718 printk("reiserfs: using flush barriers\n");
1719 }
1720 // set_device_ro(s->s_dev, 1) ;
1721 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1722 SWARN(silent, s, "sh-2022",
1723 "unable to initialize journal space");
1724 goto error;
1725 } else {
1726 jinit_done = 1; /* once this is set, journal_release must be called
1727 ** if we error out of the mount
1728 */
1729 }
1730 if (reread_meta_blocks(s)) {
1731 SWARN(silent, s, "jmacd-9",
1732 "unable to reread meta blocks after journal init");
1733 goto error;
1734 }
1735
1736 if (replay_only(s))
1737 goto error;
1738
1739 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1740 SWARN(silent, s, "clm-7000",
1741 "Detected readonly device, marking FS readonly");
1742 s->s_flags |= MS_RDONLY;
1743 }
1744 args.objectid = REISERFS_ROOT_OBJECTID;
1745 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1746 root_inode =
1747 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1748 reiserfs_init_locked_inode, (void *)(&args));
1749 if (!root_inode) {
1750 SWARN(silent, s, "jmacd-10", "get root inode failed");
1751 goto error;
1752 }
1753
1754 if (root_inode->i_state & I_NEW) {
1755 reiserfs_read_locked_inode(root_inode, &args);
1756 unlock_new_inode(root_inode);
1757 }
1758
1759 s->s_root = d_alloc_root(root_inode);
1760 if (!s->s_root) {
1761 iput(root_inode);
1762 goto error;
1763 }
1764 // define and initialize hash function
1765 sbi->s_hash_function = hash_function(s);
1766 if (sbi->s_hash_function == NULL) {
1767 dput(s->s_root);
1768 s->s_root = NULL;
1769 goto error;
1770 }
1771
1772 if (is_reiserfs_3_5(rs)
1773 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1774 set_bit(REISERFS_3_5, &(sbi->s_properties));
1775 else if (old_format)
1776 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1777 else
1778 set_bit(REISERFS_3_6, &(sbi->s_properties));
1779
1780 if (!(s->s_flags & MS_RDONLY)) {
1781
1782 errval = journal_begin(&th, s, 1);
1783 if (errval) {
1784 dput(s->s_root);
1785 s->s_root = NULL;
1786 goto error;
1787 }
1788 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1789
1790 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1791 set_sb_fs_state(rs, 0);
1792
1793 /* Clear out s_bmap_nr if it would wrap. We can handle this
1794 * case, but older revisions can't. This will cause the
1795 * file system to fail mount on those older implementations,
1796 * avoiding corruption. -jeffm */
1797 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1798 sb_bmap_nr(rs) != 0) {
1799 reiserfs_warning(s, "super-2030", "This file system "
1800 "claims to use %u bitmap blocks in "
1801 "its super block, but requires %u. "
1802 "Clearing to zero.", sb_bmap_nr(rs),
1803 reiserfs_bmap_count(s));
1804
1805 set_sb_bmap_nr(rs, 0);
1806 }
1807
1808 if (old_format_only(s)) {
1809 /* filesystem of format 3.5 either with standard or non-standard
1810 journal */
1811 if (convert_reiserfs(s)) {
1812 /* and -o conv is given */
1813 if (!silent)
1814 reiserfs_info(s,
1815 "converting 3.5 filesystem to the 3.6 format");
1816
1817 if (is_reiserfs_3_5(rs))
1818 /* put magic string of 3.6 format. 2.2 will not be able to
1819 mount this filesystem anymore */
1820 memcpy(rs->s_v1.s_magic,
1821 reiserfs_3_6_magic_string,
1822 sizeof
1823 (reiserfs_3_6_magic_string));
1824
1825 set_sb_version(rs, REISERFS_VERSION_2);
1826 reiserfs_convert_objectid_map_v1(s);
1827 set_bit(REISERFS_3_6, &(sbi->s_properties));
1828 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1829 } else if (!silent) {
1830 reiserfs_info(s, "using 3.5.x disk format\n");
1831 }
1832 } else
1833 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1834
1835
1836 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1837 errval = journal_end(&th, s, 1);
1838 if (errval) {
1839 dput(s->s_root);
1840 s->s_root = NULL;
1841 goto error;
1842 }
1843
1844 if ((errval = reiserfs_lookup_privroot(s)) ||
1845 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1846 dput(s->s_root);
1847 s->s_root = NULL;
1848 goto error;
1849 }
1850
1851 /* look for files which were to be removed in previous session */
1852 finish_unfinished(s);
1853 } else {
1854 if (old_format_only(s) && !silent) {
1855 reiserfs_info(s, "using 3.5.x disk format\n");
1856 }
1857
1858 if ((errval = reiserfs_lookup_privroot(s)) ||
1859 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1860 dput(s->s_root);
1861 s->s_root = NULL;
1862 goto error;
1863 }
1864 }
1865 // mark hash in super block: it could be unset. overwrite should be ok
1866 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1867
1868 handle_attrs(s);
1869
1870 reiserfs_proc_info_init(s);
1871
1872 init_waitqueue_head(&(sbi->s_wait));
1873 spin_lock_init(&sbi->bitmap_lock);
1874
1875 reiserfs_write_unlock(s);
1876
1877 return (0);
1878
1879 error:
1880 if (jinit_done) { /* kill the commit thread, free journal ram */
1881 journal_release_error(NULL, s);
1882 }
1883
1884 reiserfs_write_unlock(s);
1885
1886 reiserfs_free_bitmap_cache(s);
1887 if (SB_BUFFER_WITH_SB(s))
1888 brelse(SB_BUFFER_WITH_SB(s));
1889 #ifdef CONFIG_QUOTA
1890 {
1891 int j;
1892 for (j = 0; j < MAXQUOTAS; j++)
1893 kfree(qf_names[j]);
1894 }
1895 #endif
1896 kfree(sbi);
1897
1898 s->s_fs_info = NULL;
1899 return errval;
1900 }
1901
1902 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1903 {
1904 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1905
1906 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1907 buf->f_bfree = sb_free_blocks(rs);
1908 buf->f_bavail = buf->f_bfree;
1909 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1910 buf->f_bsize = dentry->d_sb->s_blocksize;
1911 /* changed to accommodate gcc folks. */
1912 buf->f_type = REISERFS_SUPER_MAGIC;
1913 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1914 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1915 sizeof(rs->s_uuid)/2);
1916
1917 return 0;
1918 }
1919
1920 #ifdef CONFIG_QUOTA
1921 static int reiserfs_write_dquot(struct dquot *dquot)
1922 {
1923 struct reiserfs_transaction_handle th;
1924 int ret, err;
1925
1926 reiserfs_write_lock(dquot->dq_sb);
1927 ret =
1928 journal_begin(&th, dquot->dq_sb,
1929 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1930 if (ret)
1931 goto out;
1932 ret = dquot_commit(dquot);
1933 err =
1934 journal_end(&th, dquot->dq_sb,
1935 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1936 if (!ret && err)
1937 ret = err;
1938 out:
1939 reiserfs_write_unlock(dquot->dq_sb);
1940 return ret;
1941 }
1942
1943 static int reiserfs_acquire_dquot(struct dquot *dquot)
1944 {
1945 struct reiserfs_transaction_handle th;
1946 int ret, err;
1947
1948 reiserfs_write_lock(dquot->dq_sb);
1949 ret =
1950 journal_begin(&th, dquot->dq_sb,
1951 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1952 if (ret)
1953 goto out;
1954 ret = dquot_acquire(dquot);
1955 err =
1956 journal_end(&th, dquot->dq_sb,
1957 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1958 if (!ret && err)
1959 ret = err;
1960 out:
1961 reiserfs_write_unlock(dquot->dq_sb);
1962 return ret;
1963 }
1964
1965 static int reiserfs_release_dquot(struct dquot *dquot)
1966 {
1967 struct reiserfs_transaction_handle th;
1968 int ret, err;
1969
1970 reiserfs_write_lock(dquot->dq_sb);
1971 ret =
1972 journal_begin(&th, dquot->dq_sb,
1973 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1974 if (ret) {
1975 /* Release dquot anyway to avoid endless cycle in dqput() */
1976 dquot_release(dquot);
1977 goto out;
1978 }
1979 ret = dquot_release(dquot);
1980 err =
1981 journal_end(&th, dquot->dq_sb,
1982 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1983 if (!ret && err)
1984 ret = err;
1985 out:
1986 reiserfs_write_unlock(dquot->dq_sb);
1987 return ret;
1988 }
1989
1990 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1991 {
1992 /* Are we journaling quotas? */
1993 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1994 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1995 dquot_mark_dquot_dirty(dquot);
1996 return reiserfs_write_dquot(dquot);
1997 } else
1998 return dquot_mark_dquot_dirty(dquot);
1999 }
2000
2001 static int reiserfs_write_info(struct super_block *sb, int type)
2002 {
2003 struct reiserfs_transaction_handle th;
2004 int ret, err;
2005
2006 /* Data block + inode block */
2007 reiserfs_write_lock(sb);
2008 ret = journal_begin(&th, sb, 2);
2009 if (ret)
2010 goto out;
2011 ret = dquot_commit_info(sb, type);
2012 err = journal_end(&th, sb, 2);
2013 if (!ret && err)
2014 ret = err;
2015 out:
2016 reiserfs_write_unlock(sb);
2017 return ret;
2018 }
2019
2020 /*
2021 * Turn on quotas during mount time - we need to find the quota file and such...
2022 */
2023 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2024 {
2025 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2026 REISERFS_SB(sb)->s_jquota_fmt, type);
2027 }
2028
2029 /*
2030 * Standard function to be called on quota_on
2031 */
2032 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2033 char *name, int remount)
2034 {
2035 int err;
2036 struct path path;
2037 struct inode *inode;
2038 struct reiserfs_transaction_handle th;
2039
2040 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2041 return -EINVAL;
2042 /* No more checks needed? Path and format_id are bogus anyway... */
2043 if (remount)
2044 return vfs_quota_on(sb, type, format_id, name, 1);
2045 err = kern_path(name, LOOKUP_FOLLOW, &path);
2046 if (err)
2047 return err;
2048 /* Quotafile not on the same filesystem? */
2049 if (path.mnt->mnt_sb != sb) {
2050 err = -EXDEV;
2051 goto out;
2052 }
2053 inode = path.dentry->d_inode;
2054 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2055 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2056 err = reiserfs_unpack(inode, NULL);
2057 if (err) {
2058 reiserfs_warning(sb, "super-6520",
2059 "Unpacking tail of quota file failed"
2060 " (%d). Cannot turn on quotas.", err);
2061 err = -EINVAL;
2062 goto out;
2063 }
2064 mark_inode_dirty(inode);
2065 }
2066 /* Journaling quota? */
2067 if (REISERFS_SB(sb)->s_qf_names[type]) {
2068 /* Quotafile not of fs root? */
2069 if (path.dentry->d_parent != sb->s_root)
2070 reiserfs_warning(sb, "super-6521",
2071 "Quota file not on filesystem root. "
2072 "Journalled quota will not work.");
2073 }
2074
2075 /*
2076 * When we journal data on quota file, we have to flush journal to see
2077 * all updates to the file when we bypass pagecache...
2078 */
2079 if (reiserfs_file_data_log(inode)) {
2080 /* Just start temporary transaction and finish it */
2081 err = journal_begin(&th, sb, 1);
2082 if (err)
2083 goto out;
2084 err = journal_end_sync(&th, sb, 1);
2085 if (err)
2086 goto out;
2087 }
2088 err = vfs_quota_on_path(sb, type, format_id, &path);
2089 out:
2090 path_put(&path);
2091 return err;
2092 }
2093
2094 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2095 * acquiring the locks... As quota files are never truncated and quota code
2096 * itself serializes the operations (and noone else should touch the files)
2097 * we don't have to be afraid of races */
2098 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2099 size_t len, loff_t off)
2100 {
2101 struct inode *inode = sb_dqopt(sb)->files[type];
2102 unsigned long blk = off >> sb->s_blocksize_bits;
2103 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2104 size_t toread;
2105 struct buffer_head tmp_bh, *bh;
2106 loff_t i_size = i_size_read(inode);
2107
2108 if (off > i_size)
2109 return 0;
2110 if (off + len > i_size)
2111 len = i_size - off;
2112 toread = len;
2113 while (toread > 0) {
2114 tocopy =
2115 sb->s_blocksize - offset <
2116 toread ? sb->s_blocksize - offset : toread;
2117 tmp_bh.b_state = 0;
2118 /* Quota files are without tails so we can safely use this function */
2119 reiserfs_write_lock(sb);
2120 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2121 reiserfs_write_unlock(sb);
2122 if (err)
2123 return err;
2124 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2125 memset(data, 0, tocopy);
2126 else {
2127 bh = sb_bread(sb, tmp_bh.b_blocknr);
2128 if (!bh)
2129 return -EIO;
2130 memcpy(data, bh->b_data + offset, tocopy);
2131 brelse(bh);
2132 }
2133 offset = 0;
2134 toread -= tocopy;
2135 data += tocopy;
2136 blk++;
2137 }
2138 return len;
2139 }
2140
2141 /* Write to quotafile (we know the transaction is already started and has
2142 * enough credits) */
2143 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2144 const char *data, size_t len, loff_t off)
2145 {
2146 struct inode *inode = sb_dqopt(sb)->files[type];
2147 unsigned long blk = off >> sb->s_blocksize_bits;
2148 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2149 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2150 size_t towrite = len;
2151 struct buffer_head tmp_bh, *bh;
2152
2153 if (!current->journal_info) {
2154 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2155 " cancelled because transaction is not started.\n",
2156 (unsigned long long)off, (unsigned long long)len);
2157 return -EIO;
2158 }
2159 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2160 while (towrite > 0) {
2161 tocopy = sb->s_blocksize - offset < towrite ?
2162 sb->s_blocksize - offset : towrite;
2163 tmp_bh.b_state = 0;
2164 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2165 if (err)
2166 goto out;
2167 if (offset || tocopy != sb->s_blocksize)
2168 bh = sb_bread(sb, tmp_bh.b_blocknr);
2169 else
2170 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2171 if (!bh) {
2172 err = -EIO;
2173 goto out;
2174 }
2175 lock_buffer(bh);
2176 memcpy(bh->b_data + offset, data, tocopy);
2177 flush_dcache_page(bh->b_page);
2178 set_buffer_uptodate(bh);
2179 unlock_buffer(bh);
2180 reiserfs_prepare_for_journal(sb, bh, 1);
2181 journal_mark_dirty(current->journal_info, sb, bh);
2182 if (!journal_quota)
2183 reiserfs_add_ordered_list(inode, bh);
2184 brelse(bh);
2185 offset = 0;
2186 towrite -= tocopy;
2187 data += tocopy;
2188 blk++;
2189 }
2190 out:
2191 if (len == towrite) {
2192 mutex_unlock(&inode->i_mutex);
2193 return err;
2194 }
2195 if (inode->i_size < off + len - towrite)
2196 i_size_write(inode, off + len - towrite);
2197 inode->i_version++;
2198 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2199 mark_inode_dirty(inode);
2200 mutex_unlock(&inode->i_mutex);
2201 return len - towrite;
2202 }
2203
2204 #endif
2205
2206 static int get_super_block(struct file_system_type *fs_type,
2207 int flags, const char *dev_name,
2208 void *data, struct vfsmount *mnt)
2209 {
2210 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2211 mnt);
2212 }
2213
2214 static int __init init_reiserfs_fs(void)
2215 {
2216 int ret;
2217
2218 if ((ret = init_inodecache())) {
2219 return ret;
2220 }
2221
2222 reiserfs_proc_info_global_init();
2223
2224 ret = register_filesystem(&reiserfs_fs_type);
2225
2226 if (ret == 0) {
2227 return 0;
2228 }
2229
2230 reiserfs_proc_info_global_done();
2231 destroy_inodecache();
2232
2233 return ret;
2234 }
2235
2236 static void __exit exit_reiserfs_fs(void)
2237 {
2238 reiserfs_proc_info_global_done();
2239 unregister_filesystem(&reiserfs_fs_type);
2240 destroy_inodecache();
2241 }
2242
2243 struct file_system_type reiserfs_fs_type = {
2244 .owner = THIS_MODULE,
2245 .name = "reiserfs",
2246 .get_sb = get_super_block,
2247 .kill_sb = reiserfs_kill_sb,
2248 .fs_flags = FS_REQUIRES_DEV,
2249 };
2250
2251 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2252 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2253 MODULE_LICENSE("GPL");
2254
2255 module_init(init_reiserfs_fs);
2256 module_exit(exit_reiserfs_fs);
linux-next