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fed up with those stupid warnings
[mmotm.git] / fs / reiserfs / super.c
blobb4a7dd03bdb9b9e49931f7a2fc360f35fbe1a561
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/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/crc32.h>
30 #include <linux/smp_lock.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 #endif
161
162 /* compose key to look for "save" links */
163 max_cpu_key.version = KEY_FORMAT_3_5;
164 max_cpu_key.on_disk_key.k_dir_id = ~0U;
165 max_cpu_key.on_disk_key.k_objectid = ~0U;
166 set_cpu_key_k_offset(&max_cpu_key, ~0U);
167 max_cpu_key.key_length = 3;
168
169 memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172 /* Needed for iput() to work correctly and not trash data */
173 if (s->s_flags & MS_ACTIVE) {
174 ms_active_set = 0;
175 } else {
176 ms_active_set = 1;
177 s->s_flags |= MS_ACTIVE;
178 }
179 /* Turn on quotas so that they are updated correctly */
180 for (i = 0; i < MAXQUOTAS; i++) {
181 if (REISERFS_SB(s)->s_qf_names[i]) {
182 int ret = reiserfs_quota_on_mount(s, i);
183 if (ret < 0)
184 reiserfs_warning(s, "reiserfs-2500",
185 "cannot turn on journaled "
186 "quota: error %d", ret);
187 }
188 }
189 #endif
190
191 done = 0;
192 REISERFS_SB(s)->s_is_unlinked_ok = 1;
193 while (!retval) {
194 retval = search_item(s, &max_cpu_key, &path);
195 if (retval != ITEM_NOT_FOUND) {
196 reiserfs_error(s, "vs-2140",
197 "search_by_key returned %d", retval);
198 break;
199 }
200
201 bh = get_last_bh(&path);
202 item_pos = get_item_pos(&path);
203 if (item_pos != B_NR_ITEMS(bh)) {
204 reiserfs_warning(s, "vs-2060",
205 "wrong position found");
206 break;
207 }
208 item_pos--;
209 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212 /* there are no "save" links anymore */
213 break;
214
215 save_link_key = ih->ih_key;
216 if (is_indirect_le_ih(ih))
217 truncate = 1;
218 else
219 truncate = 0;
220
221 /* reiserfs_iget needs k_dirid and k_objectid only */
222 item = B_I_PITEM(bh, ih);
223 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224 obj_key.on_disk_key.k_objectid =
225 le32_to_cpu(ih->ih_key.k_objectid);
226 obj_key.on_disk_key.k_offset = 0;
227 obj_key.on_disk_key.k_type = 0;
228
229 pathrelse(&path);
230
231 inode = reiserfs_iget(s, &obj_key);
232 if (!inode) {
233 /* the unlink almost completed, it just did not manage to remove
234 "save" link and release objectid */
235 reiserfs_warning(s, "vs-2180", "iget failed for %K",
236 &obj_key);
237 retval = remove_save_link_only(s, &save_link_key, 1);
238 continue;
239 }
240
241 if (!truncate && inode->i_nlink) {
242 /* file is not unlinked */
243 reiserfs_warning(s, "vs-2185",
244 "file %K is not unlinked",
245 &obj_key);
246 retval = remove_save_link_only(s, &save_link_key, 0);
247 continue;
248 }
249 vfs_dq_init(inode);
250
251 if (truncate && S_ISDIR(inode->i_mode)) {
252 /* We got a truncate request for a dir which is impossible.
253 The only imaginable way is to execute unfinished truncate request
254 then boot into old kernel, remove the file and create dir with
255 the same key. */
256 reiserfs_warning(s, "green-2101",
257 "impossible truncate on a "
258 "directory %k. Please report",
259 INODE_PKEY(inode));
260 retval = remove_save_link_only(s, &save_link_key, 0);
261 truncate = 0;
262 iput(inode);
263 continue;
264 }
265
266 if (truncate) {
267 REISERFS_I(inode)->i_flags |=
268 i_link_saved_truncate_mask;
269 /* not completed truncate found. New size was committed together
270 with "save" link */
271 reiserfs_info(s, "Truncating %k to %Ld ..",
272 INODE_PKEY(inode), inode->i_size);
273 reiserfs_truncate_file(inode,
274 0
275 /*don't update modification time */
276 );
277 retval = remove_save_link(inode, truncate);
278 } else {
279 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280 /* not completed unlink (rmdir) found */
281 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282 if (memcmp(&last_inode_key, INODE_PKEY(inode),
283 sizeof(last_inode_key))){
284 last_inode_key = *INODE_PKEY(inode);
285 /* removal gets completed in iput */
286 retval = 0;
287 } else {
288 reiserfs_warning(s, "super-2189", "Dead loop "
289 "in finish_unfinished "
290 "detected, just remove "
291 "save link\n");
292 retval = remove_save_link_only(s,
293 &save_link_key, 0);
294 }
295 }
296
297 iput(inode);
298 printk("done\n");
299 done++;
300 }
301 REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304 /* Turn quotas off */
305 for (i = 0; i < MAXQUOTAS; i++) {
306 if (sb_dqopt(s)->files[i])
307 vfs_quota_off(s, i, 0);
308 }
309 if (ms_active_set)
310 /* Restore the flag back */
311 s->s_flags &= ~MS_ACTIVE;
312 #endif
313 pathrelse(&path);
314 if (done)
315 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316 "Completed\n", done);
317 return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321 being unlinked. This link will be deleted in the same transaction with last
322 item of file. mounting the filesystem we scan all these links and remove
323 files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325 struct inode *inode, int truncate)
326 {
327 INITIALIZE_PATH(path);
328 int retval;
329 struct cpu_key key;
330 struct item_head ih;
331 __le32 link;
332
333 BUG_ON(!th->t_trans_id);
334
335 /* file can only get one "save link" of each kind */
336 RFALSE(truncate &&
337 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338 "saved link already exists for truncated inode %lx",
339 (long)inode->i_ino);
340 RFALSE(!truncate &&
341 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342 "saved link already exists for unlinked inode %lx",
343 (long)inode->i_ino);
344
345 /* setup key of "save" link */
346 key.version = KEY_FORMAT_3_5;
347 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348 key.on_disk_key.k_objectid = inode->i_ino;
349 if (!truncate) {
350 /* unlink, rmdir, rename */
351 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354 /* item head of "safe" link */
355 make_le_item_head(&ih, &key, key.version,
356 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357 4 /*length */ , 0xffff /*free space */ );
358 } else {
359 /* truncate */
360 if (S_ISDIR(inode->i_mode))
361 reiserfs_warning(inode->i_sb, "green-2102",
362 "Adding a truncate savelink for "
363 "a directory %k! Please report",
364 INODE_PKEY(inode));
365 set_cpu_key_k_offset(&key, 1);
366 set_cpu_key_k_type(&key, TYPE_INDIRECT);
367
368 /* item head of "safe" link */
369 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
370 4 /*length */ , 0 /*free space */ );
371 }
372 key.key_length = 3;
373
374 /* look for its place in the tree */
375 retval = search_item(inode->i_sb, &key, &path);
376 if (retval != ITEM_NOT_FOUND) {
377 if (retval != -ENOSPC)
378 reiserfs_error(inode->i_sb, "vs-2100",
379 "search_by_key (%K) returned %d", &key,
380 retval);
381 pathrelse(&path);
382 return;
383 }
384
385 /* body of "save" link */
386 link = INODE_PKEY(inode)->k_dir_id;
387
388 /* put "save" link inot tree, don't charge quota to anyone */
389 retval =
390 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
391 if (retval) {
392 if (retval != -ENOSPC)
393 reiserfs_error(inode->i_sb, "vs-2120",
394 "insert_item returned %d", retval);
395 } else {
396 if (truncate)
397 REISERFS_I(inode)->i_flags |=
398 i_link_saved_truncate_mask;
399 else
400 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401 }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407 struct reiserfs_transaction_handle th;
408 struct reiserfs_key key;
409 int err;
410
411 /* we are going to do one balancing only */
412 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413 if (err)
414 return err;
415
416 /* setup key of "save" link */
417 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418 key.k_objectid = INODE_PKEY(inode)->k_objectid;
419 if (!truncate) {
420 /* unlink, rmdir, rename */
421 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422 1 + inode->i_sb->s_blocksize);
423 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424 } else {
425 /* truncate */
426 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428 }
429
430 if ((truncate &&
431 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432 (!truncate &&
433 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434 /* don't take quota bytes from anywhere */
435 reiserfs_delete_solid_item(&th, NULL, &key);
436 if (!truncate) {
437 reiserfs_release_objectid(&th, inode->i_ino);
438 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439 } else
440 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447 if (REISERFS_SB(s)) {
448 if (REISERFS_SB(s)->xattr_root) {
449 d_invalidate(REISERFS_SB(s)->xattr_root);
450 dput(REISERFS_SB(s)->xattr_root);
451 REISERFS_SB(s)->xattr_root = NULL;
452 }
453 if (REISERFS_SB(s)->priv_root) {
454 d_invalidate(REISERFS_SB(s)->priv_root);
455 dput(REISERFS_SB(s)->priv_root);
456 REISERFS_SB(s)->priv_root = NULL;
457 }
458 }
459
460 kill_block_super(s);
461 }
462
463 static void reiserfs_put_super(struct super_block *s)
464 {
465 struct reiserfs_transaction_handle th;
466 th.t_trans_id = 0;
467
468 reiserfs_write_lock(s);
469
470 if (s->s_dirt)
471 reiserfs_write_super(s);
472
473 /* change file system state to current state if it was mounted with read-write permissions */
474 if (!(s->s_flags & MS_RDONLY)) {
475 if (!journal_begin(&th, s, 10)) {
476 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
477 1);
478 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
479 REISERFS_SB(s)->s_mount_state);
480 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
481 }
482 }
483
484 /* note, journal_release checks for readonly mount, and can decide not
485 ** to do a journal_end
486 */
487 journal_release(&th, s);
488
489 reiserfs_free_bitmap_cache(s);
490
491 brelse(SB_BUFFER_WITH_SB(s));
492
493 print_statistics(s);
494
495 if (REISERFS_SB(s)->reserved_blocks != 0) {
496 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
497 REISERFS_SB(s)->reserved_blocks);
498 }
499
500 reiserfs_proc_info_done(s);
501
502 reiserfs_write_unlock(s);
503 mutex_destroy(&REISERFS_SB(s)->lock);
504 kfree(s->s_fs_info);
505 s->s_fs_info = NULL;
506 }
507
508 static struct kmem_cache *reiserfs_inode_cachep;
509
510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
511 {
512 struct reiserfs_inode_info *ei;
513 ei = (struct reiserfs_inode_info *)
514 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
515 if (!ei)
516 return NULL;
517 return &ei->vfs_inode;
518 }
519
520 static void reiserfs_destroy_inode(struct inode *inode)
521 {
522 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
523 }
524
525 static void init_once(void *foo)
526 {
527 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
528
529 INIT_LIST_HEAD(&ei->i_prealloc_list);
530 inode_init_once(&ei->vfs_inode);
531 }
532
533 static int init_inodecache(void)
534 {
535 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
536 sizeof(struct
537 reiserfs_inode_info),
538 0, (SLAB_RECLAIM_ACCOUNT|
539 SLAB_MEM_SPREAD),
540 init_once);
541 if (reiserfs_inode_cachep == NULL)
542 return -ENOMEM;
543 return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548 kmem_cache_destroy(reiserfs_inode_cachep);
549 }
550
551 /* we don't mark inodes dirty, we just log them */
552 static void reiserfs_dirty_inode(struct inode *inode)
553 {
554 struct reiserfs_transaction_handle th;
555
556 int err = 0;
557 int lock_depth;
558
559 if (inode->i_sb->s_flags & MS_RDONLY) {
560 reiserfs_warning(inode->i_sb, "clm-6006",
561 "writing inode %lu on readonly FS",
562 inode->i_ino);
563 return;
564 }
565 lock_depth = reiserfs_write_lock_once(inode->i_sb);
566
567 /* this is really only used for atime updates, so they don't have
568 ** to be included in O_SYNC or fsync
569 */
570 err = journal_begin(&th, inode->i_sb, 1);
571 if (err)
572 goto out;
573
574 reiserfs_update_sd(&th, inode);
575 journal_end(&th, inode->i_sb, 1);
576
577 out:
578 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
579 }
580
581 #ifdef CONFIG_QUOTA
582 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
583 size_t, loff_t);
584 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
585 loff_t);
586 #endif
587
588 static const struct super_operations reiserfs_sops = {
589 .alloc_inode = reiserfs_alloc_inode,
590 .destroy_inode = reiserfs_destroy_inode,
591 .write_inode = reiserfs_write_inode,
592 .dirty_inode = reiserfs_dirty_inode,
593 .delete_inode = reiserfs_delete_inode,
594 .put_super = reiserfs_put_super,
595 .write_super = reiserfs_write_super,
596 .sync_fs = reiserfs_sync_fs,
597 .freeze_fs = reiserfs_freeze,
598 .unfreeze_fs = reiserfs_unfreeze,
599 .statfs = reiserfs_statfs,
600 .remount_fs = reiserfs_remount,
601 .show_options = generic_show_options,
602 #ifdef CONFIG_QUOTA
603 .quota_read = reiserfs_quota_read,
604 .quota_write = reiserfs_quota_write,
605 #endif
606 };
607
608 #ifdef CONFIG_QUOTA
609 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
610
611 static int reiserfs_write_dquot(struct dquot *);
612 static int reiserfs_acquire_dquot(struct dquot *);
613 static int reiserfs_release_dquot(struct dquot *);
614 static int reiserfs_mark_dquot_dirty(struct dquot *);
615 static int reiserfs_write_info(struct super_block *, int);
616 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
617
618 static const struct dquot_operations reiserfs_quota_operations = {
619 .initialize = dquot_initialize,
620 .drop = dquot_drop,
621 .alloc_space = dquot_alloc_space,
622 .alloc_inode = dquot_alloc_inode,
623 .free_space = dquot_free_space,
624 .free_inode = dquot_free_inode,
625 .transfer = dquot_transfer,
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 errval = -ENOMEM;
1624 goto error_alloc;
1625 }
1626 s->s_fs_info = sbi;
1627 /* Set default values for options: non-aggressive tails, RO on errors */
1628 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1629 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1630 /* no preallocation minimum, be smart in
1631 reiserfs_file_write instead */
1632 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1633 /* Preallocate by 16 blocks (17-1) at once */
1634 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1635 /* setup default block allocator options */
1636 reiserfs_init_alloc_options(s);
1637
1638 mutex_init(&REISERFS_SB(s)->lock);
1639 REISERFS_SB(s)->lock_depth = -1;
1640
1641 /*
1642 * This function is called with the bkl, which also was the old
1643 * locking used here.
1644 * do_journal_begin() will soon check if we hold the lock (ie: was the
1645 * bkl). This is likely because do_journal_begin() has several another
1646 * callers because at this time, it doesn't seem to be necessary to
1647 * protect against anything.
1648 * Anyway, let's be conservative and lock for now.
1649 */
1650 reiserfs_write_lock(s);
1651
1652 jdev_name = NULL;
1653 if (reiserfs_parse_options
1654 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1655 &commit_max_age, qf_names, &qfmt) == 0) {
1656 goto error;
1657 }
1658 #ifdef CONFIG_QUOTA
1659 handle_quota_files(s, qf_names, &qfmt);
1660 #endif
1661
1662 if (blocks) {
1663 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1664 goto error;
1665 }
1666
1667 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1668 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1669 old_format = 1;
1670 /* try new format (64-th 1k block), which can contain reiserfs super block */
1671 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1672 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1673 reiserfs_bdevname(s));
1674 goto error;
1675 }
1676
1677 rs = SB_DISK_SUPER_BLOCK(s);
1678 /* Let's do basic sanity check to verify that underlying device is not
1679 smaller than the filesystem. If the check fails then abort and scream,
1680 because bad stuff will happen otherwise. */
1681 if (s->s_bdev && s->s_bdev->bd_inode
1682 && i_size_read(s->s_bdev->bd_inode) <
1683 sb_block_count(rs) * sb_blocksize(rs)) {
1684 SWARN(silent, s, "", "Filesystem cannot be "
1685 "mounted because it is bigger than the device");
1686 SWARN(silent, s, "", "You may need to run fsck "
1687 "or increase size of your LVM partition");
1688 SWARN(silent, s, "", "Or may be you forgot to "
1689 "reboot after fdisk when it told you to");
1690 goto error;
1691 }
1692
1693 sbi->s_mount_state = SB_REISERFS_STATE(s);
1694 sbi->s_mount_state = REISERFS_VALID_FS;
1695
1696 if ((errval = reiserfs_init_bitmap_cache(s))) {
1697 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1698 goto error;
1699 }
1700 errval = -EINVAL;
1701 #ifdef CONFIG_REISERFS_CHECK
1702 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1703 SWARN(silent, s, "", "- it is slow mode for debugging.");
1704 #endif
1705
1706 /* make data=ordered the default */
1707 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1708 !reiserfs_data_writeback(s)) {
1709 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1710 }
1711
1712 if (reiserfs_data_log(s)) {
1713 reiserfs_info(s, "using journaled data mode\n");
1714 } else if (reiserfs_data_ordered(s)) {
1715 reiserfs_info(s, "using ordered data mode\n");
1716 } else {
1717 reiserfs_info(s, "using writeback data mode\n");
1718 }
1719 if (reiserfs_barrier_flush(s)) {
1720 printk("reiserfs: using flush barriers\n");
1721 }
1722 // set_device_ro(s->s_dev, 1) ;
1723 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1724 SWARN(silent, s, "sh-2022",
1725 "unable to initialize journal space");
1726 goto error;
1727 } else {
1728 jinit_done = 1; /* once this is set, journal_release must be called
1729 ** if we error out of the mount
1730 */
1731 }
1732 if (reread_meta_blocks(s)) {
1733 SWARN(silent, s, "jmacd-9",
1734 "unable to reread meta blocks after journal init");
1735 goto error;
1736 }
1737
1738 if (replay_only(s))
1739 goto error;
1740
1741 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1742 SWARN(silent, s, "clm-7000",
1743 "Detected readonly device, marking FS readonly");
1744 s->s_flags |= MS_RDONLY;
1745 }
1746 args.objectid = REISERFS_ROOT_OBJECTID;
1747 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1748 root_inode =
1749 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1750 reiserfs_init_locked_inode, (void *)(&args));
1751 if (!root_inode) {
1752 SWARN(silent, s, "jmacd-10", "get root inode failed");
1753 goto error;
1754 }
1755
1756 if (root_inode->i_state & I_NEW) {
1757 reiserfs_read_locked_inode(root_inode, &args);
1758 unlock_new_inode(root_inode);
1759 }
1760
1761 s->s_root = d_alloc_root(root_inode);
1762 if (!s->s_root) {
1763 iput(root_inode);
1764 goto error;
1765 }
1766 // define and initialize hash function
1767 sbi->s_hash_function = hash_function(s);
1768 if (sbi->s_hash_function == NULL) {
1769 dput(s->s_root);
1770 s->s_root = NULL;
1771 goto error;
1772 }
1773
1774 if (is_reiserfs_3_5(rs)
1775 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1776 set_bit(REISERFS_3_5, &(sbi->s_properties));
1777 else if (old_format)
1778 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1779 else
1780 set_bit(REISERFS_3_6, &(sbi->s_properties));
1781
1782 if (!(s->s_flags & MS_RDONLY)) {
1783
1784 errval = journal_begin(&th, s, 1);
1785 if (errval) {
1786 dput(s->s_root);
1787 s->s_root = NULL;
1788 goto error;
1789 }
1790 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1791
1792 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1793 set_sb_fs_state(rs, 0);
1794
1795 /* Clear out s_bmap_nr if it would wrap. We can handle this
1796 * case, but older revisions can't. This will cause the
1797 * file system to fail mount on those older implementations,
1798 * avoiding corruption. -jeffm */
1799 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1800 sb_bmap_nr(rs) != 0) {
1801 reiserfs_warning(s, "super-2030", "This file system "
1802 "claims to use %u bitmap blocks in "
1803 "its super block, but requires %u. "
1804 "Clearing to zero.", sb_bmap_nr(rs),
1805 reiserfs_bmap_count(s));
1806
1807 set_sb_bmap_nr(rs, 0);
1808 }
1809
1810 if (old_format_only(s)) {
1811 /* filesystem of format 3.5 either with standard or non-standard
1812 journal */
1813 if (convert_reiserfs(s)) {
1814 /* and -o conv is given */
1815 if (!silent)
1816 reiserfs_info(s,
1817 "converting 3.5 filesystem to the 3.6 format");
1818
1819 if (is_reiserfs_3_5(rs))
1820 /* put magic string of 3.6 format. 2.2 will not be able to
1821 mount this filesystem anymore */
1822 memcpy(rs->s_v1.s_magic,
1823 reiserfs_3_6_magic_string,
1824 sizeof
1825 (reiserfs_3_6_magic_string));
1826
1827 set_sb_version(rs, REISERFS_VERSION_2);
1828 reiserfs_convert_objectid_map_v1(s);
1829 set_bit(REISERFS_3_6, &(sbi->s_properties));
1830 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1831 } else if (!silent) {
1832 reiserfs_info(s, "using 3.5.x disk format\n");
1833 }
1834 } else
1835 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1836
1837
1838 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1839 errval = journal_end(&th, s, 1);
1840 if (errval) {
1841 dput(s->s_root);
1842 s->s_root = NULL;
1843 goto error;
1844 }
1845
1846 if ((errval = reiserfs_lookup_privroot(s)) ||
1847 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1848 dput(s->s_root);
1849 s->s_root = NULL;
1850 goto error;
1851 }
1852
1853 /* look for files which were to be removed in previous session */
1854 finish_unfinished(s);
1855 } else {
1856 if (old_format_only(s) && !silent) {
1857 reiserfs_info(s, "using 3.5.x disk format\n");
1858 }
1859
1860 if ((errval = reiserfs_lookup_privroot(s)) ||
1861 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1862 dput(s->s_root);
1863 s->s_root = NULL;
1864 goto error;
1865 }
1866 }
1867 // mark hash in super block: it could be unset. overwrite should be ok
1868 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1869
1870 handle_attrs(s);
1871
1872 reiserfs_proc_info_init(s);
1873
1874 init_waitqueue_head(&(sbi->s_wait));
1875 spin_lock_init(&sbi->bitmap_lock);
1876
1877 reiserfs_write_unlock(s);
1878
1879 return (0);
1880
1881 error:
1882 reiserfs_write_unlock(s);
1883 error_alloc:
1884 if (jinit_done) { /* kill the commit thread, free journal ram */
1885 journal_release_error(NULL, s);
1886 }
1887
1888 reiserfs_free_bitmap_cache(s);
1889 if (SB_BUFFER_WITH_SB(s))
1890 brelse(SB_BUFFER_WITH_SB(s));
1891 #ifdef CONFIG_QUOTA
1892 {
1893 int j;
1894 for (j = 0; j < MAXQUOTAS; j++)
1895 kfree(qf_names[j]);
1896 }
1897 #endif
1898 kfree(sbi);
1899
1900 s->s_fs_info = NULL;
1901 return errval;
1902 }
1903
1904 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1905 {
1906 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1907
1908 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1909 buf->f_bfree = sb_free_blocks(rs);
1910 buf->f_bavail = buf->f_bfree;
1911 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1912 buf->f_bsize = dentry->d_sb->s_blocksize;
1913 /* changed to accommodate gcc folks. */
1914 buf->f_type = REISERFS_SUPER_MAGIC;
1915 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1916 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1917 sizeof(rs->s_uuid)/2);
1918
1919 return 0;
1920 }
1921
1922 #ifdef CONFIG_QUOTA
1923 static int reiserfs_write_dquot(struct dquot *dquot)
1924 {
1925 struct reiserfs_transaction_handle th;
1926 int ret, err;
1927
1928 reiserfs_write_lock(dquot->dq_sb);
1929 ret =
1930 journal_begin(&th, dquot->dq_sb,
1931 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1932 if (ret)
1933 goto out;
1934 ret = dquot_commit(dquot);
1935 err =
1936 journal_end(&th, dquot->dq_sb,
1937 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1938 if (!ret && err)
1939 ret = err;
1940 out:
1941 reiserfs_write_unlock(dquot->dq_sb);
1942 return ret;
1943 }
1944
1945 static int reiserfs_acquire_dquot(struct dquot *dquot)
1946 {
1947 struct reiserfs_transaction_handle th;
1948 int ret, err;
1949
1950 reiserfs_write_lock(dquot->dq_sb);
1951 ret =
1952 journal_begin(&th, dquot->dq_sb,
1953 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1954 if (ret)
1955 goto out;
1956 ret = dquot_acquire(dquot);
1957 err =
1958 journal_end(&th, dquot->dq_sb,
1959 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1960 if (!ret && err)
1961 ret = err;
1962 out:
1963 reiserfs_write_unlock(dquot->dq_sb);
1964 return ret;
1965 }
1966
1967 static int reiserfs_release_dquot(struct dquot *dquot)
1968 {
1969 struct reiserfs_transaction_handle th;
1970 int ret, err;
1971
1972 reiserfs_write_lock(dquot->dq_sb);
1973 ret =
1974 journal_begin(&th, dquot->dq_sb,
1975 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1976 if (ret) {
1977 /* Release dquot anyway to avoid endless cycle in dqput() */
1978 dquot_release(dquot);
1979 goto out;
1980 }
1981 ret = dquot_release(dquot);
1982 err =
1983 journal_end(&th, dquot->dq_sb,
1984 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1985 if (!ret && err)
1986 ret = err;
1987 out:
1988 reiserfs_write_unlock(dquot->dq_sb);
1989 return ret;
1990 }
1991
1992 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1993 {
1994 /* Are we journaling quotas? */
1995 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1996 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1997 dquot_mark_dquot_dirty(dquot);
1998 return reiserfs_write_dquot(dquot);
1999 } else
2000 return dquot_mark_dquot_dirty(dquot);
2001 }
2002
2003 static int reiserfs_write_info(struct super_block *sb, int type)
2004 {
2005 struct reiserfs_transaction_handle th;
2006 int ret, err;
2007
2008 /* Data block + inode block */
2009 reiserfs_write_lock(sb);
2010 ret = journal_begin(&th, sb, 2);
2011 if (ret)
2012 goto out;
2013 ret = dquot_commit_info(sb, type);
2014 err = journal_end(&th, sb, 2);
2015 if (!ret && err)
2016 ret = err;
2017 out:
2018 reiserfs_write_unlock(sb);
2019 return ret;
2020 }
2021
2022 /*
2023 * Turn on quotas during mount time - we need to find the quota file and such...
2024 */
2025 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2026 {
2027 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2028 REISERFS_SB(sb)->s_jquota_fmt, type);
2029 }
2030
2031 /*
2032 * Standard function to be called on quota_on
2033 */
2034 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2035 char *name, int remount)
2036 {
2037 int err;
2038 struct path path;
2039 struct inode *inode;
2040 struct reiserfs_transaction_handle th;
2041
2042 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2043 return -EINVAL;
2044 /* No more checks needed? Path and format_id are bogus anyway... */
2045 if (remount)
2046 return vfs_quota_on(sb, type, format_id, name, 1);
2047 err = kern_path(name, LOOKUP_FOLLOW, &path);
2048 if (err)
2049 return err;
2050 /* Quotafile not on the same filesystem? */
2051 if (path.mnt->mnt_sb != sb) {
2052 err = -EXDEV;
2053 goto out;
2054 }
2055 inode = path.dentry->d_inode;
2056 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2057 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2058 err = reiserfs_unpack(inode, NULL);
2059 if (err) {
2060 reiserfs_warning(sb, "super-6520",
2061 "Unpacking tail of quota file failed"
2062 " (%d). Cannot turn on quotas.", err);
2063 err = -EINVAL;
2064 goto out;
2065 }
2066 mark_inode_dirty(inode);
2067 }
2068 /* Journaling quota? */
2069 if (REISERFS_SB(sb)->s_qf_names[type]) {
2070 /* Quotafile not of fs root? */
2071 if (path.dentry->d_parent != sb->s_root)
2072 reiserfs_warning(sb, "super-6521",
2073 "Quota file not on filesystem root. "
2074 "Journalled quota will not work.");
2075 }
2076
2077 /*
2078 * When we journal data on quota file, we have to flush journal to see
2079 * all updates to the file when we bypass pagecache...
2080 */
2081 if (reiserfs_file_data_log(inode)) {
2082 /* Just start temporary transaction and finish it */
2083 err = journal_begin(&th, sb, 1);
2084 if (err)
2085 goto out;
2086 err = journal_end_sync(&th, sb, 1);
2087 if (err)
2088 goto out;
2089 }
2090 err = vfs_quota_on_path(sb, type, format_id, &path);
2091 out:
2092 path_put(&path);
2093 return err;
2094 }
2095
2096 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2097 * acquiring the locks... As quota files are never truncated and quota code
2098 * itself serializes the operations (and noone else should touch the files)
2099 * we don't have to be afraid of races */
2100 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2101 size_t len, loff_t off)
2102 {
2103 struct inode *inode = sb_dqopt(sb)->files[type];
2104 unsigned long blk = off >> sb->s_blocksize_bits;
2105 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2106 size_t toread;
2107 struct buffer_head tmp_bh, *bh;
2108 loff_t i_size = i_size_read(inode);
2109
2110 if (off > i_size)
2111 return 0;
2112 if (off + len > i_size)
2113 len = i_size - off;
2114 toread = len;
2115 while (toread > 0) {
2116 tocopy =
2117 sb->s_blocksize - offset <
2118 toread ? sb->s_blocksize - offset : toread;
2119 tmp_bh.b_state = 0;
2120 /* Quota files are without tails so we can safely use this function */
2121 reiserfs_write_lock(sb);
2122 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2123 reiserfs_write_unlock(sb);
2124 if (err)
2125 return err;
2126 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2127 memset(data, 0, tocopy);
2128 else {
2129 bh = sb_bread(sb, tmp_bh.b_blocknr);
2130 if (!bh)
2131 return -EIO;
2132 memcpy(data, bh->b_data + offset, tocopy);
2133 brelse(bh);
2134 }
2135 offset = 0;
2136 toread -= tocopy;
2137 data += tocopy;
2138 blk++;
2139 }
2140 return len;
2141 }
2142
2143 /* Write to quotafile (we know the transaction is already started and has
2144 * enough credits) */
2145 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2146 const char *data, size_t len, loff_t off)
2147 {
2148 struct inode *inode = sb_dqopt(sb)->files[type];
2149 unsigned long blk = off >> sb->s_blocksize_bits;
2150 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2151 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2152 size_t towrite = len;
2153 struct buffer_head tmp_bh, *bh;
2154
2155 if (!current->journal_info) {
2156 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2157 " cancelled because transaction is not started.\n",
2158 (unsigned long long)off, (unsigned long long)len);
2159 return -EIO;
2160 }
2161 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2162 while (towrite > 0) {
2163 tocopy = sb->s_blocksize - offset < towrite ?
2164 sb->s_blocksize - offset : towrite;
2165 tmp_bh.b_state = 0;
2166 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2167 if (err)
2168 goto out;
2169 if (offset || tocopy != sb->s_blocksize)
2170 bh = sb_bread(sb, tmp_bh.b_blocknr);
2171 else
2172 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2173 if (!bh) {
2174 err = -EIO;
2175 goto out;
2176 }
2177 lock_buffer(bh);
2178 memcpy(bh->b_data + offset, data, tocopy);
2179 flush_dcache_page(bh->b_page);
2180 set_buffer_uptodate(bh);
2181 unlock_buffer(bh);
2182 reiserfs_prepare_for_journal(sb, bh, 1);
2183 journal_mark_dirty(current->journal_info, sb, bh);
2184 if (!journal_quota)
2185 reiserfs_add_ordered_list(inode, bh);
2186 brelse(bh);
2187 offset = 0;
2188 towrite -= tocopy;
2189 data += tocopy;
2190 blk++;
2191 }
2192 out:
2193 if (len == towrite) {
2194 mutex_unlock(&inode->i_mutex);
2195 return err;
2196 }
2197 if (inode->i_size < off + len - towrite)
2198 i_size_write(inode, off + len - towrite);
2199 inode->i_version++;
2200 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2201 mark_inode_dirty(inode);
2202 mutex_unlock(&inode->i_mutex);
2203 return len - towrite;
2204 }
2205
2206 #endif
2207
2208 static int get_super_block(struct file_system_type *fs_type,
2209 int flags, const char *dev_name,
2210 void *data, struct vfsmount *mnt)
2211 {
2212 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2213 mnt);
2214 }
2215
2216 static int __init init_reiserfs_fs(void)
2217 {
2218 int ret;
2219
2220 if ((ret = init_inodecache())) {
2221 return ret;
2222 }
2223
2224 reiserfs_proc_info_global_init();
2225
2226 ret = register_filesystem(&reiserfs_fs_type);
2227
2228 if (ret == 0) {
2229 return 0;
2230 }
2231
2232 reiserfs_proc_info_global_done();
2233 destroy_inodecache();
2234
2235 return ret;
2236 }
2237
2238 static void __exit exit_reiserfs_fs(void)
2239 {
2240 reiserfs_proc_info_global_done();
2241 unregister_filesystem(&reiserfs_fs_type);
2242 destroy_inodecache();
2243 }
2244
2245 struct file_system_type reiserfs_fs_type = {
2246 .owner = THIS_MODULE,
2247 .name = "reiserfs",
2248 .get_sb = get_super_block,
2249 .kill_sb = reiserfs_kill_sb,
2250 .fs_flags = FS_REQUIRES_DEV,
2251 };
2252
2253 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2254 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2255 MODULE_LICENSE("GPL");
2256
2257 module_init(init_reiserfs_fs);
2258 module_exit(exit_reiserfs_fs);
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