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quota: move unmount handling into the filesystem
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob08879af0af0d54c33f83d94abc362ab190914fe7
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 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
470
471 reiserfs_write_lock(s);
472
473 if (s->s_dirt)
474 reiserfs_write_super(s);
475
476 /* change file system state to current state if it was mounted with read-write permissions */
477 if (!(s->s_flags & MS_RDONLY)) {
478 if (!journal_begin(&th, s, 10)) {
479 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
480 1);
481 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
482 REISERFS_SB(s)->s_mount_state);
483 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
484 }
485 }
486
487 /* note, journal_release checks for readonly mount, and can decide not
488 ** to do a journal_end
489 */
490 journal_release(&th, s);
491
492 reiserfs_free_bitmap_cache(s);
493
494 brelse(SB_BUFFER_WITH_SB(s));
495
496 print_statistics(s);
497
498 if (REISERFS_SB(s)->reserved_blocks != 0) {
499 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
500 REISERFS_SB(s)->reserved_blocks);
501 }
502
503 reiserfs_proc_info_done(s);
504
505 reiserfs_write_unlock(s);
506 mutex_destroy(&REISERFS_SB(s)->lock);
507 kfree(s->s_fs_info);
508 s->s_fs_info = NULL;
509 }
510
511 static struct kmem_cache *reiserfs_inode_cachep;
512
513 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
514 {
515 struct reiserfs_inode_info *ei;
516 ei = (struct reiserfs_inode_info *)
517 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
518 if (!ei)
519 return NULL;
520 return &ei->vfs_inode;
521 }
522
523 static void reiserfs_destroy_inode(struct inode *inode)
524 {
525 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
526 }
527
528 static void init_once(void *foo)
529 {
530 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
531
532 INIT_LIST_HEAD(&ei->i_prealloc_list);
533 inode_init_once(&ei->vfs_inode);
534 }
535
536 static int init_inodecache(void)
537 {
538 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
539 sizeof(struct
540 reiserfs_inode_info),
541 0, (SLAB_RECLAIM_ACCOUNT|
542 SLAB_MEM_SPREAD),
543 init_once);
544 if (reiserfs_inode_cachep == NULL)
545 return -ENOMEM;
546 return 0;
547 }
548
549 static void destroy_inodecache(void)
550 {
551 kmem_cache_destroy(reiserfs_inode_cachep);
552 }
553
554 /* we don't mark inodes dirty, we just log them */
555 static void reiserfs_dirty_inode(struct inode *inode)
556 {
557 struct reiserfs_transaction_handle th;
558
559 int err = 0;
560 int lock_depth;
561
562 if (inode->i_sb->s_flags & MS_RDONLY) {
563 reiserfs_warning(inode->i_sb, "clm-6006",
564 "writing inode %lu on readonly FS",
565 inode->i_ino);
566 return;
567 }
568 lock_depth = reiserfs_write_lock_once(inode->i_sb);
569
570 /* this is really only used for atime updates, so they don't have
571 ** to be included in O_SYNC or fsync
572 */
573 err = journal_begin(&th, inode->i_sb, 1);
574 if (err)
575 goto out;
576
577 reiserfs_update_sd(&th, inode);
578 journal_end(&th, inode->i_sb, 1);
579
580 out:
581 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
582 }
583
584 static void reiserfs_clear_inode(struct inode *inode)
585 {
586 dquot_drop(inode);
587 }
588
589 #ifdef CONFIG_QUOTA
590 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
591 size_t, loff_t);
592 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
593 loff_t);
594 #endif
595
596 static const struct super_operations reiserfs_sops = {
597 .alloc_inode = reiserfs_alloc_inode,
598 .destroy_inode = reiserfs_destroy_inode,
599 .write_inode = reiserfs_write_inode,
600 .dirty_inode = reiserfs_dirty_inode,
601 .clear_inode = reiserfs_clear_inode,
602 .delete_inode = reiserfs_delete_inode,
603 .put_super = reiserfs_put_super,
604 .write_super = reiserfs_write_super,
605 .sync_fs = reiserfs_sync_fs,
606 .freeze_fs = reiserfs_freeze,
607 .unfreeze_fs = reiserfs_unfreeze,
608 .statfs = reiserfs_statfs,
609 .remount_fs = reiserfs_remount,
610 .show_options = generic_show_options,
611 #ifdef CONFIG_QUOTA
612 .quota_read = reiserfs_quota_read,
613 .quota_write = reiserfs_quota_write,
614 #endif
615 };
616
617 #ifdef CONFIG_QUOTA
618 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
619
620 static int reiserfs_write_dquot(struct dquot *);
621 static int reiserfs_acquire_dquot(struct dquot *);
622 static int reiserfs_release_dquot(struct dquot *);
623 static int reiserfs_mark_dquot_dirty(struct dquot *);
624 static int reiserfs_write_info(struct super_block *, int);
625 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
626
627 static const struct dquot_operations reiserfs_quota_operations = {
628 .write_dquot = reiserfs_write_dquot,
629 .acquire_dquot = reiserfs_acquire_dquot,
630 .release_dquot = reiserfs_release_dquot,
631 .mark_dirty = reiserfs_mark_dquot_dirty,
632 .write_info = reiserfs_write_info,
633 .alloc_dquot = dquot_alloc,
634 .destroy_dquot = dquot_destroy,
635 };
636
637 static const struct quotactl_ops reiserfs_qctl_operations = {
638 .quota_on = reiserfs_quota_on,
639 .quota_off = vfs_quota_off,
640 .quota_sync = vfs_quota_sync,
641 .get_info = vfs_get_dqinfo,
642 .set_info = vfs_set_dqinfo,
643 .get_dqblk = vfs_get_dqblk,
644 .set_dqblk = vfs_set_dqblk,
645 };
646 #endif
647
648 static const struct export_operations reiserfs_export_ops = {
649 .encode_fh = reiserfs_encode_fh,
650 .fh_to_dentry = reiserfs_fh_to_dentry,
651 .fh_to_parent = reiserfs_fh_to_parent,
652 .get_parent = reiserfs_get_parent,
653 };
654
655 /* this struct is used in reiserfs_getopt () for containing the value for those
656 mount options that have values rather than being toggles. */
657 typedef struct {
658 char *value;
659 int setmask; /* bitmask which is to set on mount_options bitmask when this
660 value is found, 0 is no bits are to be changed. */
661 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
662 value is found, 0 is no bits are to be changed. This is
663 applied BEFORE setmask */
664 } arg_desc_t;
665
666 /* Set this bit in arg_required to allow empty arguments */
667 #define REISERFS_OPT_ALLOWEMPTY 31
668
669 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
670 mount options */
671 typedef struct {
672 char *option_name;
673 int arg_required; /* 0 if argument is not required, not 0 otherwise */
674 const arg_desc_t *values; /* list of values accepted by an option */
675 int setmask; /* bitmask which is to set on mount_options bitmask when this
676 value is found, 0 is no bits are to be changed. */
677 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
678 value is found, 0 is no bits are to be changed. This is
679 applied BEFORE setmask */
680 } opt_desc_t;
681
682 /* possible values for -o data= */
683 static const arg_desc_t logging_mode[] = {
684 {"ordered", 1 << REISERFS_DATA_ORDERED,
685 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
686 {"journal", 1 << REISERFS_DATA_LOG,
687 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
688 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
689 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
690 {.value = NULL}
691 };
692
693 /* possible values for -o barrier= */
694 static const arg_desc_t barrier_mode[] = {
695 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
696 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
697 {.value = NULL}
698 };
699
700 /* possible values for "-o block-allocator=" and bits which are to be set in
701 s_mount_opt of reiserfs specific part of in-core super block */
702 static const arg_desc_t balloc[] = {
703 {"noborder", 1 << REISERFS_NO_BORDER, 0},
704 {"border", 0, 1 << REISERFS_NO_BORDER},
705 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
706 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
707 {"test4", 1 << REISERFS_TEST4, 0},
708 {"notest4", 0, 1 << REISERFS_TEST4},
709 {NULL, 0, 0}
710 };
711
712 static const arg_desc_t tails[] = {
713 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
714 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
715 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
716 {NULL, 0, 0}
717 };
718
719 static const arg_desc_t error_actions[] = {
720 {"panic", 1 << REISERFS_ERROR_PANIC,
721 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
722 {"ro-remount", 1 << REISERFS_ERROR_RO,
723 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
724 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
725 {"continue", 1 << REISERFS_ERROR_CONTINUE,
726 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
727 #endif
728 {NULL, 0, 0},
729 };
730
731 /* proceed only one option from a list *cur - string containing of mount options
732 opts - array of options which are accepted
733 opt_arg - if option is found and requires an argument and if it is specifed
734 in the input - pointer to the argument is stored here
735 bit_flags - if option requires to set a certain bit - it is set here
736 return -1 if unknown option is found, opt->arg_required otherwise */
737 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
738 char **opt_arg, unsigned long *bit_flags)
739 {
740 char *p;
741 /* foo=bar,
742 ^ ^ ^
743 | | +-- option_end
744 | +-- arg_start
745 +-- option_start
746 */
747 const opt_desc_t *opt;
748 const arg_desc_t *arg;
749
750 p = *cur;
751
752 /* assume argument cannot contain commas */
753 *cur = strchr(p, ',');
754 if (*cur) {
755 *(*cur) = '\0';
756 (*cur)++;
757 }
758
759 if (!strncmp(p, "alloc=", 6)) {
760 /* Ugly special case, probably we should redo options parser so that
761 it can understand several arguments for some options, also so that
762 it can fill several bitfields with option values. */
763 if (reiserfs_parse_alloc_options(s, p + 6)) {
764 return -1;
765 } else {
766 return 0;
767 }
768 }
769
770 /* for every option in the list */
771 for (opt = opts; opt->option_name; opt++) {
772 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
773 if (bit_flags) {
774 if (opt->clrmask ==
775 (1 << REISERFS_UNSUPPORTED_OPT))
776 reiserfs_warning(s, "super-6500",
777 "%s not supported.\n",
778 p);
779 else
780 *bit_flags &= ~opt->clrmask;
781 if (opt->setmask ==
782 (1 << REISERFS_UNSUPPORTED_OPT))
783 reiserfs_warning(s, "super-6501",
784 "%s not supported.\n",
785 p);
786 else
787 *bit_flags |= opt->setmask;
788 }
789 break;
790 }
791 }
792 if (!opt->option_name) {
793 reiserfs_warning(s, "super-6502",
794 "unknown mount option \"%s\"", p);
795 return -1;
796 }
797
798 p += strlen(opt->option_name);
799 switch (*p) {
800 case '=':
801 if (!opt->arg_required) {
802 reiserfs_warning(s, "super-6503",
803 "the option \"%s\" does not "
804 "require an argument\n",
805 opt->option_name);
806 return -1;
807 }
808 break;
809
810 case 0:
811 if (opt->arg_required) {
812 reiserfs_warning(s, "super-6504",
813 "the option \"%s\" requires an "
814 "argument\n", opt->option_name);
815 return -1;
816 }
817 break;
818 default:
819 reiserfs_warning(s, "super-6505",
820 "head of option \"%s\" is only correct\n",
821 opt->option_name);
822 return -1;
823 }
824
825 /* move to the argument, or to next option if argument is not required */
826 p++;
827
828 if (opt->arg_required
829 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
830 && !strlen(p)) {
831 /* this catches "option=," if not allowed */
832 reiserfs_warning(s, "super-6506",
833 "empty argument for \"%s\"\n",
834 opt->option_name);
835 return -1;
836 }
837
838 if (!opt->values) {
839 /* *=NULLopt_arg contains pointer to argument */
840 *opt_arg = p;
841 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
842 }
843
844 /* values possible for this option are listed in opt->values */
845 for (arg = opt->values; arg->value; arg++) {
846 if (!strcmp(p, arg->value)) {
847 if (bit_flags) {
848 *bit_flags &= ~arg->clrmask;
849 *bit_flags |= arg->setmask;
850 }
851 return opt->arg_required;
852 }
853 }
854
855 reiserfs_warning(s, "super-6506",
856 "bad value \"%s\" for option \"%s\"\n", p,
857 opt->option_name);
858 return -1;
859 }
860
861 /* returns 0 if something is wrong in option string, 1 - otherwise */
862 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
863 unsigned long *mount_options,
864 /* after the parsing phase, contains the
865 collection of bitflags defining what
866 mount options were selected. */
867 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
868 char **jdev_name,
869 unsigned int *commit_max_age,
870 char **qf_names,
871 unsigned int *qfmt)
872 {
873 int c;
874 char *arg = NULL;
875 char *pos;
876 opt_desc_t opts[] = {
877 /* Compatibility stuff, so that -o notail for old setups still work */
878 {"tails",.arg_required = 't',.values = tails},
879 {"notail",.clrmask =
880 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
881 {"conv",.setmask = 1 << REISERFS_CONVERT},
882 {"attrs",.setmask = 1 << REISERFS_ATTRS},
883 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
884 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
885 #ifdef CONFIG_REISERFS_FS_XATTR
886 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
887 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
888 #else
889 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
890 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 #endif
892 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
893 {"acl",.setmask = 1 << REISERFS_POSIXACL},
894 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
895 #else
896 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
897 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
898 #endif
899 {.option_name = "nolog"},
900 {"replayonly",.setmask = 1 << REPLAYONLY},
901 {"block-allocator",.arg_required = 'a',.values = balloc},
902 {"data",.arg_required = 'd',.values = logging_mode},
903 {"barrier",.arg_required = 'b',.values = barrier_mode},
904 {"resize",.arg_required = 'r',.values = NULL},
905 {"jdev",.arg_required = 'j',.values = NULL},
906 {"nolargeio",.arg_required = 'w',.values = NULL},
907 {"commit",.arg_required = 'c',.values = NULL},
908 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
909 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
910 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
911 {"errors",.arg_required = 'e',.values = error_actions},
912 {"usrjquota",.arg_required =
913 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
914 {"grpjquota",.arg_required =
915 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
916 {"jqfmt",.arg_required = 'f',.values = NULL},
917 {.option_name = NULL}
918 };
919
920 *blocks = 0;
921 if (!options || !*options)
922 /* use default configuration: create tails, journaling on, no
923 conversion to newest format */
924 return 1;
925
926 for (pos = options; pos;) {
927 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
928 if (c == -1)
929 /* wrong option is given */
930 return 0;
931
932 if (c == 'r') {
933 char *p;
934
935 p = NULL;
936 /* "resize=NNN" or "resize=auto" */
937
938 if (!strcmp(arg, "auto")) {
939 /* From JFS code, to auto-get the size. */
940 *blocks =
941 s->s_bdev->bd_inode->i_size >> s->
942 s_blocksize_bits;
943 } else {
944 *blocks = simple_strtoul(arg, &p, 0);
945 if (*p != '\0') {
946 /* NNN does not look like a number */
947 reiserfs_warning(s, "super-6507",
948 "bad value %s for "
949 "-oresize\n", arg);
950 return 0;
951 }
952 }
953 }
954
955 if (c == 'c') {
956 char *p = NULL;
957 unsigned long val = simple_strtoul(arg, &p, 0);
958 /* commit=NNN (time in seconds) */
959 if (*p != '\0' || val >= (unsigned int)-1) {
960 reiserfs_warning(s, "super-6508",
961 "bad value %s for -ocommit\n",
962 arg);
963 return 0;
964 }
965 *commit_max_age = (unsigned int)val;
966 }
967
968 if (c == 'w') {
969 reiserfs_warning(s, "super-6509", "nolargeio option "
970 "is no longer supported");
971 return 0;
972 }
973
974 if (c == 'j') {
975 if (arg && *arg && jdev_name) {
976 if (*jdev_name) { //Hm, already assigned?
977 reiserfs_warning(s, "super-6510",
978 "journal device was "
979 "already specified to "
980 "be %s", *jdev_name);
981 return 0;
982 }
983 *jdev_name = arg;
984 }
985 }
986 #ifdef CONFIG_QUOTA
987 if (c == 'u' || c == 'g') {
988 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
989
990 if (sb_any_quota_loaded(s) &&
991 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
992 reiserfs_warning(s, "super-6511",
993 "cannot change journaled "
994 "quota options when quota "
995 "turned on.");
996 return 0;
997 }
998 if (*arg) { /* Some filename specified? */
999 if (REISERFS_SB(s)->s_qf_names[qtype]
1000 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1001 arg)) {
1002 reiserfs_warning(s, "super-6512",
1003 "%s quota file "
1004 "already specified.",
1005 QTYPE2NAME(qtype));
1006 return 0;
1007 }
1008 if (strchr(arg, '/')) {
1009 reiserfs_warning(s, "super-6513",
1010 "quotafile must be "
1011 "on filesystem root.");
1012 return 0;
1013 }
1014 qf_names[qtype] =
1015 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1016 if (!qf_names[qtype]) {
1017 reiserfs_warning(s, "reiserfs-2502",
1018 "not enough memory "
1019 "for storing "
1020 "quotafile name.");
1021 return 0;
1022 }
1023 strcpy(qf_names[qtype], arg);
1024 *mount_options |= 1 << REISERFS_QUOTA;
1025 } else {
1026 if (qf_names[qtype] !=
1027 REISERFS_SB(s)->s_qf_names[qtype])
1028 kfree(qf_names[qtype]);
1029 qf_names[qtype] = NULL;
1030 }
1031 }
1032 if (c == 'f') {
1033 if (!strcmp(arg, "vfsold"))
1034 *qfmt = QFMT_VFS_OLD;
1035 else if (!strcmp(arg, "vfsv0"))
1036 *qfmt = QFMT_VFS_V0;
1037 else {
1038 reiserfs_warning(s, "super-6514",
1039 "unknown quota format "
1040 "specified.");
1041 return 0;
1042 }
1043 if (sb_any_quota_loaded(s) &&
1044 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1045 reiserfs_warning(s, "super-6515",
1046 "cannot change journaled "
1047 "quota options when quota "
1048 "turned on.");
1049 return 0;
1050 }
1051 }
1052 #else
1053 if (c == 'u' || c == 'g' || c == 'f') {
1054 reiserfs_warning(s, "reiserfs-2503", "journaled "
1055 "quota options not supported.");
1056 return 0;
1057 }
1058 #endif
1059 }
1060
1061 #ifdef CONFIG_QUOTA
1062 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1063 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1064 reiserfs_warning(s, "super-6515",
1065 "journaled quota format not specified.");
1066 return 0;
1067 }
1068 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1069 if (!(*mount_options & (1 << REISERFS_QUOTA))
1070 && sb_any_quota_loaded(s)) {
1071 reiserfs_warning(s, "super-6516", "quota options must "
1072 "be present when quota is turned on.");
1073 return 0;
1074 }
1075 #endif
1076
1077 return 1;
1078 }
1079
1080 static void switch_data_mode(struct super_block *s, unsigned long mode)
1081 {
1082 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1083 (1 << REISERFS_DATA_ORDERED) |
1084 (1 << REISERFS_DATA_WRITEBACK));
1085 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1086 }
1087
1088 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1089 {
1090 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1091 if (!reiserfs_data_log(s)) {
1092 switch_data_mode(s, REISERFS_DATA_LOG);
1093 reiserfs_info(s, "switching to journaled data mode\n");
1094 }
1095 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1096 if (!reiserfs_data_ordered(s)) {
1097 switch_data_mode(s, REISERFS_DATA_ORDERED);
1098 reiserfs_info(s, "switching to ordered data mode\n");
1099 }
1100 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1101 if (!reiserfs_data_writeback(s)) {
1102 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1103 reiserfs_info(s, "switching to writeback data mode\n");
1104 }
1105 }
1106 }
1107
1108 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1109 {
1110 int flush = (1 << REISERFS_BARRIER_FLUSH);
1111 int none = (1 << REISERFS_BARRIER_NONE);
1112 int all_barrier = flush | none;
1113
1114 if (bits & all_barrier) {
1115 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1116 if (bits & flush) {
1117 REISERFS_SB(s)->s_mount_opt |= flush;
1118 printk("reiserfs: enabling write barrier flush mode\n");
1119 } else if (bits & none) {
1120 REISERFS_SB(s)->s_mount_opt |= none;
1121 printk("reiserfs: write barriers turned off\n");
1122 }
1123 }
1124 }
1125
1126 static void handle_attrs(struct super_block *s)
1127 {
1128 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1129
1130 if (reiserfs_attrs(s)) {
1131 if (old_format_only(s)) {
1132 reiserfs_warning(s, "super-6517", "cannot support "
1133 "attributes on 3.5.x disk format");
1134 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1135 return;
1136 }
1137 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1138 reiserfs_warning(s, "super-6518", "cannot support "
1139 "attributes until flag is set in "
1140 "super-block");
1141 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1142 }
1143 }
1144 }
1145
1146 #ifdef CONFIG_QUOTA
1147 static void handle_quota_files(struct super_block *s, char **qf_names,
1148 unsigned int *qfmt)
1149 {
1150 int i;
1151
1152 for (i = 0; i < MAXQUOTAS; i++) {
1153 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1154 kfree(REISERFS_SB(s)->s_qf_names[i]);
1155 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1156 }
1157 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1158 }
1159 #endif
1160
1161 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1162 {
1163 struct reiserfs_super_block *rs;
1164 struct reiserfs_transaction_handle th;
1165 unsigned long blocks;
1166 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1167 unsigned long safe_mask = 0;
1168 unsigned int commit_max_age = (unsigned int)-1;
1169 struct reiserfs_journal *journal = SB_JOURNAL(s);
1170 char *new_opts = kstrdup(arg, GFP_KERNEL);
1171 int err;
1172 char *qf_names[MAXQUOTAS];
1173 unsigned int qfmt = 0;
1174 #ifdef CONFIG_QUOTA
1175 int i;
1176 #endif
1177
1178 reiserfs_write_lock(s);
1179
1180 #ifdef CONFIG_QUOTA
1181 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1182 #endif
1183
1184 rs = SB_DISK_SUPER_BLOCK(s);
1185
1186 if (!reiserfs_parse_options
1187 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1188 qf_names, &qfmt)) {
1189 #ifdef CONFIG_QUOTA
1190 for (i = 0; i < MAXQUOTAS; i++)
1191 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1192 kfree(qf_names[i]);
1193 #endif
1194 err = -EINVAL;
1195 goto out_err;
1196 }
1197 #ifdef CONFIG_QUOTA
1198 handle_quota_files(s, qf_names, &qfmt);
1199 #endif
1200
1201 handle_attrs(s);
1202
1203 /* Add options that are safe here */
1204 safe_mask |= 1 << REISERFS_SMALLTAIL;
1205 safe_mask |= 1 << REISERFS_LARGETAIL;
1206 safe_mask |= 1 << REISERFS_NO_BORDER;
1207 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1208 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1209 safe_mask |= 1 << REISERFS_TEST4;
1210 safe_mask |= 1 << REISERFS_ATTRS;
1211 safe_mask |= 1 << REISERFS_XATTRS_USER;
1212 safe_mask |= 1 << REISERFS_POSIXACL;
1213 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1214 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1215 safe_mask |= 1 << REISERFS_ERROR_RO;
1216 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1217 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1218 safe_mask |= 1 << REISERFS_QUOTA;
1219
1220 /* Update the bitmask, taking care to keep
1221 * the bits we're not allowed to change here */
1222 REISERFS_SB(s)->s_mount_opt =
1223 (REISERFS_SB(s)->
1224 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1225
1226 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1227 journal->j_max_commit_age = commit_max_age;
1228 journal->j_max_trans_age = commit_max_age;
1229 } else if (commit_max_age == 0) {
1230 /* 0 means restore defaults. */
1231 journal->j_max_commit_age = journal->j_default_max_commit_age;
1232 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1233 }
1234
1235 if (blocks) {
1236 err = reiserfs_resize(s, blocks);
1237 if (err != 0)
1238 goto out_err;
1239 }
1240
1241 if (*mount_flags & MS_RDONLY) {
1242 reiserfs_xattr_init(s, *mount_flags);
1243 /* remount read-only */
1244 if (s->s_flags & MS_RDONLY)
1245 /* it is read-only already */
1246 goto out_ok;
1247
1248 err = dquot_suspend(s, -1);
1249 if (err < 0)
1250 goto out_err;
1251
1252 /* try to remount file system with read-only permissions */
1253 if (sb_umount_state(rs) == REISERFS_VALID_FS
1254 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1255 goto out_ok;
1256 }
1257
1258 err = journal_begin(&th, s, 10);
1259 if (err)
1260 goto out_err;
1261
1262 /* Mounting a rw partition read-only. */
1263 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1264 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1265 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1266 } else {
1267 /* remount read-write */
1268 if (!(s->s_flags & MS_RDONLY)) {
1269 reiserfs_xattr_init(s, *mount_flags);
1270 goto out_ok; /* We are read-write already */
1271 }
1272
1273 if (reiserfs_is_journal_aborted(journal)) {
1274 err = journal->j_errno;
1275 goto out_err;
1276 }
1277
1278 handle_data_mode(s, mount_options);
1279 handle_barrier_mode(s, mount_options);
1280 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1281 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1282 err = journal_begin(&th, s, 10);
1283 if (err)
1284 goto out_err;
1285
1286 /* Mount a partition which is read-only, read-write */
1287 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1288 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1289 s->s_flags &= ~MS_RDONLY;
1290 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1291 if (!old_format_only(s))
1292 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1293 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1294 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1295 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1296 }
1297 /* this will force a full flush of all journal lists */
1298 SB_JOURNAL(s)->j_must_wait = 1;
1299 err = journal_end(&th, s, 10);
1300 if (err)
1301 goto out_err;
1302 s->s_dirt = 0;
1303
1304 if (!(*mount_flags & MS_RDONLY)) {
1305 dquot_resume(s, -1);
1306 finish_unfinished(s);
1307 reiserfs_xattr_init(s, *mount_flags);
1308 }
1309
1310 out_ok:
1311 replace_mount_options(s, new_opts);
1312 reiserfs_write_unlock(s);
1313 return 0;
1314
1315 out_err:
1316 kfree(new_opts);
1317 reiserfs_write_unlock(s);
1318 return err;
1319 }
1320
1321 static int read_super_block(struct super_block *s, int offset)
1322 {
1323 struct buffer_head *bh;
1324 struct reiserfs_super_block *rs;
1325 int fs_blocksize;
1326
1327 bh = sb_bread(s, offset / s->s_blocksize);
1328 if (!bh) {
1329 reiserfs_warning(s, "sh-2006",
1330 "bread failed (dev %s, block %lu, size %lu)",
1331 reiserfs_bdevname(s), offset / s->s_blocksize,
1332 s->s_blocksize);
1333 return 1;
1334 }
1335
1336 rs = (struct reiserfs_super_block *)bh->b_data;
1337 if (!is_any_reiserfs_magic_string(rs)) {
1338 brelse(bh);
1339 return 1;
1340 }
1341 //
1342 // ok, reiserfs signature (old or new) found in at the given offset
1343 //
1344 fs_blocksize = sb_blocksize(rs);
1345 brelse(bh);
1346 sb_set_blocksize(s, fs_blocksize);
1347
1348 bh = sb_bread(s, offset / s->s_blocksize);
1349 if (!bh) {
1350 reiserfs_warning(s, "sh-2007",
1351 "bread failed (dev %s, block %lu, size %lu)",
1352 reiserfs_bdevname(s), offset / s->s_blocksize,
1353 s->s_blocksize);
1354 return 1;
1355 }
1356
1357 rs = (struct reiserfs_super_block *)bh->b_data;
1358 if (sb_blocksize(rs) != s->s_blocksize) {
1359 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1360 "filesystem on (dev %s, block %Lu, size %lu)",
1361 reiserfs_bdevname(s),
1362 (unsigned long long)bh->b_blocknr,
1363 s->s_blocksize);
1364 brelse(bh);
1365 return 1;
1366 }
1367
1368 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1369 brelse(bh);
1370 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1371 "--rebuild-tree run detected. Please run\n"
1372 "reiserfsck --rebuild-tree and wait for a "
1373 "completion. If that fails\n"
1374 "get newer reiserfsprogs package");
1375 return 1;
1376 }
1377
1378 SB_BUFFER_WITH_SB(s) = bh;
1379 SB_DISK_SUPER_BLOCK(s) = rs;
1380
1381 if (is_reiserfs_jr(rs)) {
1382 /* magic is of non-standard journal filesystem, look at s_version to
1383 find which format is in use */
1384 if (sb_version(rs) == REISERFS_VERSION_2)
1385 reiserfs_info(s, "found reiserfs format \"3.6\""
1386 " with non-standard journal\n");
1387 else if (sb_version(rs) == REISERFS_VERSION_1)
1388 reiserfs_info(s, "found reiserfs format \"3.5\""
1389 " with non-standard journal\n");
1390 else {
1391 reiserfs_warning(s, "sh-2012", "found unknown "
1392 "format \"%u\" of reiserfs with "
1393 "non-standard magic", sb_version(rs));
1394 return 1;
1395 }
1396 } else
1397 /* s_version of standard format may contain incorrect information,
1398 so we just look at the magic string */
1399 reiserfs_info(s,
1400 "found reiserfs format \"%s\" with standard journal\n",
1401 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1402
1403 s->s_op = &reiserfs_sops;
1404 s->s_export_op = &reiserfs_export_ops;
1405 #ifdef CONFIG_QUOTA
1406 s->s_qcop = &reiserfs_qctl_operations;
1407 s->dq_op = &reiserfs_quota_operations;
1408 #endif
1409
1410 /* new format is limited by the 32 bit wide i_blocks field, want to
1411 ** be one full block below that.
1412 */
1413 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1414 return 0;
1415 }
1416
1417 /* after journal replay, reread all bitmap and super blocks */
1418 static int reread_meta_blocks(struct super_block *s)
1419 {
1420 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1421 reiserfs_write_unlock(s);
1422 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1423 reiserfs_write_lock(s);
1424 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1425 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1426 return 1;
1427 }
1428
1429 return 0;
1430 }
1431
1432 /////////////////////////////////////////////////////
1433 // hash detection stuff
1434
1435 // if root directory is empty - we set default - Yura's - hash and
1436 // warn about it
1437 // FIXME: we look for only one name in a directory. If tea and yura
1438 // bith have the same value - we ask user to send report to the
1439 // mailing list
1440 static __u32 find_hash_out(struct super_block *s)
1441 {
1442 int retval;
1443 struct inode *inode;
1444 struct cpu_key key;
1445 INITIALIZE_PATH(path);
1446 struct reiserfs_dir_entry de;
1447 __u32 hash = DEFAULT_HASH;
1448
1449 inode = s->s_root->d_inode;
1450
1451 do { // Some serious "goto"-hater was there ;)
1452 u32 teahash, r5hash, yurahash;
1453
1454 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1455 retval = search_by_entry_key(s, &key, &path, &de);
1456 if (retval == IO_ERROR) {
1457 pathrelse(&path);
1458 return UNSET_HASH;
1459 }
1460 if (retval == NAME_NOT_FOUND)
1461 de.de_entry_num--;
1462 set_de_name_and_namelen(&de);
1463 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1464 /* allow override in this case */
1465 if (reiserfs_rupasov_hash(s)) {
1466 hash = YURA_HASH;
1467 }
1468 reiserfs_info(s, "FS seems to be empty, autodetect "
1469 "is using the default hash\n");
1470 break;
1471 }
1472 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1473 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1474 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1475 if (((teahash == r5hash)
1476 &&
1477 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1478 == r5hash)) || ((teahash == yurahash)
1479 && (yurahash ==
1480 GET_HASH_VALUE(deh_offset
1481 (&
1482 (de.
1483 de_deh[de.
1484 de_entry_num])))))
1485 || ((r5hash == yurahash)
1486 && (yurahash ==
1487 GET_HASH_VALUE(deh_offset
1488 (&(de.de_deh[de.de_entry_num])))))) {
1489 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1490 "automatically detect hash function. "
1491 "Please mount with -o "
1492 "hash={tea,rupasov,r5}");
1493 hash = UNSET_HASH;
1494 break;
1495 }
1496 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1497 yurahash)
1498 hash = YURA_HASH;
1499 else if (GET_HASH_VALUE
1500 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1501 hash = TEA_HASH;
1502 else if (GET_HASH_VALUE
1503 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1504 hash = R5_HASH;
1505 else {
1506 reiserfs_warning(s, "reiserfs-2506",
1507 "Unrecognised hash function");
1508 hash = UNSET_HASH;
1509 }
1510 } while (0);
1511
1512 pathrelse(&path);
1513 return hash;
1514 }
1515
1516 // finds out which hash names are sorted with
1517 static int what_hash(struct super_block *s)
1518 {
1519 __u32 code;
1520
1521 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1522
1523 /* reiserfs_hash_detect() == true if any of the hash mount options
1524 ** were used. We must check them to make sure the user isn't
1525 ** using a bad hash value
1526 */
1527 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1528 code = find_hash_out(s);
1529
1530 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1531 /* detection has found the hash, and we must check against the
1532 ** mount options
1533 */
1534 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1535 reiserfs_warning(s, "reiserfs-2507",
1536 "Error, %s hash detected, "
1537 "unable to force rupasov hash",
1538 reiserfs_hashname(code));
1539 code = UNSET_HASH;
1540 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1541 reiserfs_warning(s, "reiserfs-2508",
1542 "Error, %s hash detected, "
1543 "unable to force tea hash",
1544 reiserfs_hashname(code));
1545 code = UNSET_HASH;
1546 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1547 reiserfs_warning(s, "reiserfs-2509",
1548 "Error, %s hash detected, "
1549 "unable to force r5 hash",
1550 reiserfs_hashname(code));
1551 code = UNSET_HASH;
1552 }
1553 } else {
1554 /* find_hash_out was not called or could not determine the hash */
1555 if (reiserfs_rupasov_hash(s)) {
1556 code = YURA_HASH;
1557 } else if (reiserfs_tea_hash(s)) {
1558 code = TEA_HASH;
1559 } else if (reiserfs_r5_hash(s)) {
1560 code = R5_HASH;
1561 }
1562 }
1563
1564 /* if we are mounted RW, and we have a new valid hash code, update
1565 ** the super
1566 */
1567 if (code != UNSET_HASH &&
1568 !(s->s_flags & MS_RDONLY) &&
1569 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1570 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1571 }
1572 return code;
1573 }
1574
1575 // return pointer to appropriate function
1576 static hashf_t hash_function(struct super_block *s)
1577 {
1578 switch (what_hash(s)) {
1579 case TEA_HASH:
1580 reiserfs_info(s, "Using tea hash to sort names\n");
1581 return keyed_hash;
1582 case YURA_HASH:
1583 reiserfs_info(s, "Using rupasov hash to sort names\n");
1584 return yura_hash;
1585 case R5_HASH:
1586 reiserfs_info(s, "Using r5 hash to sort names\n");
1587 return r5_hash;
1588 }
1589 return NULL;
1590 }
1591
1592 // this is used to set up correct value for old partitions
1593 static int function2code(hashf_t func)
1594 {
1595 if (func == keyed_hash)
1596 return TEA_HASH;
1597 if (func == yura_hash)
1598 return YURA_HASH;
1599 if (func == r5_hash)
1600 return R5_HASH;
1601
1602 BUG(); // should never happen
1603
1604 return 0;
1605 }
1606
1607 #define SWARN(silent, s, id, ...) \
1608 if (!(silent)) \
1609 reiserfs_warning(s, id, __VA_ARGS__)
1610
1611 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1612 {
1613 struct inode *root_inode;
1614 struct reiserfs_transaction_handle th;
1615 int old_format = 0;
1616 unsigned long blocks;
1617 unsigned int commit_max_age = 0;
1618 int jinit_done = 0;
1619 struct reiserfs_iget_args args;
1620 struct reiserfs_super_block *rs;
1621 char *jdev_name;
1622 struct reiserfs_sb_info *sbi;
1623 int errval = -EINVAL;
1624 char *qf_names[MAXQUOTAS] = {};
1625 unsigned int qfmt = 0;
1626
1627 save_mount_options(s, data);
1628
1629 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1630 if (!sbi)
1631 return -ENOMEM;
1632 s->s_fs_info = sbi;
1633 /* Set default values for options: non-aggressive tails, RO on errors */
1634 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1635 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1636 /* no preallocation minimum, be smart in
1637 reiserfs_file_write instead */
1638 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1639 /* Preallocate by 16 blocks (17-1) at once */
1640 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1641 /* setup default block allocator options */
1642 reiserfs_init_alloc_options(s);
1643
1644 mutex_init(&REISERFS_SB(s)->lock);
1645 REISERFS_SB(s)->lock_depth = -1;
1646
1647 /*
1648 * This function is called with the bkl, which also was the old
1649 * locking used here.
1650 * do_journal_begin() will soon check if we hold the lock (ie: was the
1651 * bkl). This is likely because do_journal_begin() has several another
1652 * callers because at this time, it doesn't seem to be necessary to
1653 * protect against anything.
1654 * Anyway, let's be conservative and lock for now.
1655 */
1656 reiserfs_write_lock(s);
1657
1658 jdev_name = NULL;
1659 if (reiserfs_parse_options
1660 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1661 &commit_max_age, qf_names, &qfmt) == 0) {
1662 goto error;
1663 }
1664 #ifdef CONFIG_QUOTA
1665 handle_quota_files(s, qf_names, &qfmt);
1666 #endif
1667
1668 if (blocks) {
1669 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1670 goto error;
1671 }
1672
1673 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1674 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1675 old_format = 1;
1676 /* try new format (64-th 1k block), which can contain reiserfs super block */
1677 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1678 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1679 reiserfs_bdevname(s));
1680 goto error;
1681 }
1682
1683 rs = SB_DISK_SUPER_BLOCK(s);
1684 /* Let's do basic sanity check to verify that underlying device is not
1685 smaller than the filesystem. If the check fails then abort and scream,
1686 because bad stuff will happen otherwise. */
1687 if (s->s_bdev && s->s_bdev->bd_inode
1688 && i_size_read(s->s_bdev->bd_inode) <
1689 sb_block_count(rs) * sb_blocksize(rs)) {
1690 SWARN(silent, s, "", "Filesystem cannot be "
1691 "mounted because it is bigger than the device");
1692 SWARN(silent, s, "", "You may need to run fsck "
1693 "or increase size of your LVM partition");
1694 SWARN(silent, s, "", "Or may be you forgot to "
1695 "reboot after fdisk when it told you to");
1696 goto error;
1697 }
1698
1699 sbi->s_mount_state = SB_REISERFS_STATE(s);
1700 sbi->s_mount_state = REISERFS_VALID_FS;
1701
1702 if ((errval = reiserfs_init_bitmap_cache(s))) {
1703 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1704 goto error;
1705 }
1706 errval = -EINVAL;
1707 #ifdef CONFIG_REISERFS_CHECK
1708 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1709 SWARN(silent, s, "", "- it is slow mode for debugging.");
1710 #endif
1711
1712 /* make data=ordered the default */
1713 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1714 !reiserfs_data_writeback(s)) {
1715 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1716 }
1717
1718 if (reiserfs_data_log(s)) {
1719 reiserfs_info(s, "using journaled data mode\n");
1720 } else if (reiserfs_data_ordered(s)) {
1721 reiserfs_info(s, "using ordered data mode\n");
1722 } else {
1723 reiserfs_info(s, "using writeback data mode\n");
1724 }
1725 if (reiserfs_barrier_flush(s)) {
1726 printk("reiserfs: using flush barriers\n");
1727 }
1728 // set_device_ro(s->s_dev, 1) ;
1729 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1730 SWARN(silent, s, "sh-2022",
1731 "unable to initialize journal space");
1732 goto error;
1733 } else {
1734 jinit_done = 1; /* once this is set, journal_release must be called
1735 ** if we error out of the mount
1736 */
1737 }
1738 if (reread_meta_blocks(s)) {
1739 SWARN(silent, s, "jmacd-9",
1740 "unable to reread meta blocks after journal init");
1741 goto error;
1742 }
1743
1744 if (replay_only(s))
1745 goto error;
1746
1747 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1748 SWARN(silent, s, "clm-7000",
1749 "Detected readonly device, marking FS readonly");
1750 s->s_flags |= MS_RDONLY;
1751 }
1752 args.objectid = REISERFS_ROOT_OBJECTID;
1753 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1754 root_inode =
1755 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1756 reiserfs_init_locked_inode, (void *)(&args));
1757 if (!root_inode) {
1758 SWARN(silent, s, "jmacd-10", "get root inode failed");
1759 goto error;
1760 }
1761
1762 if (root_inode->i_state & I_NEW) {
1763 reiserfs_read_locked_inode(root_inode, &args);
1764 unlock_new_inode(root_inode);
1765 }
1766
1767 s->s_root = d_alloc_root(root_inode);
1768 if (!s->s_root) {
1769 iput(root_inode);
1770 goto error;
1771 }
1772 // define and initialize hash function
1773 sbi->s_hash_function = hash_function(s);
1774 if (sbi->s_hash_function == NULL) {
1775 dput(s->s_root);
1776 s->s_root = NULL;
1777 goto error;
1778 }
1779
1780 if (is_reiserfs_3_5(rs)
1781 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1782 set_bit(REISERFS_3_5, &(sbi->s_properties));
1783 else if (old_format)
1784 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1785 else
1786 set_bit(REISERFS_3_6, &(sbi->s_properties));
1787
1788 if (!(s->s_flags & MS_RDONLY)) {
1789
1790 errval = journal_begin(&th, s, 1);
1791 if (errval) {
1792 dput(s->s_root);
1793 s->s_root = NULL;
1794 goto error;
1795 }
1796 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1797
1798 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1799 set_sb_fs_state(rs, 0);
1800
1801 /* Clear out s_bmap_nr if it would wrap. We can handle this
1802 * case, but older revisions can't. This will cause the
1803 * file system to fail mount on those older implementations,
1804 * avoiding corruption. -jeffm */
1805 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1806 sb_bmap_nr(rs) != 0) {
1807 reiserfs_warning(s, "super-2030", "This file system "
1808 "claims to use %u bitmap blocks in "
1809 "its super block, but requires %u. "
1810 "Clearing to zero.", sb_bmap_nr(rs),
1811 reiserfs_bmap_count(s));
1812
1813 set_sb_bmap_nr(rs, 0);
1814 }
1815
1816 if (old_format_only(s)) {
1817 /* filesystem of format 3.5 either with standard or non-standard
1818 journal */
1819 if (convert_reiserfs(s)) {
1820 /* and -o conv is given */
1821 if (!silent)
1822 reiserfs_info(s,
1823 "converting 3.5 filesystem to the 3.6 format");
1824
1825 if (is_reiserfs_3_5(rs))
1826 /* put magic string of 3.6 format. 2.2 will not be able to
1827 mount this filesystem anymore */
1828 memcpy(rs->s_v1.s_magic,
1829 reiserfs_3_6_magic_string,
1830 sizeof
1831 (reiserfs_3_6_magic_string));
1832
1833 set_sb_version(rs, REISERFS_VERSION_2);
1834 reiserfs_convert_objectid_map_v1(s);
1835 set_bit(REISERFS_3_6, &(sbi->s_properties));
1836 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1837 } else if (!silent) {
1838 reiserfs_info(s, "using 3.5.x disk format\n");
1839 }
1840 } else
1841 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1842
1843
1844 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1845 errval = journal_end(&th, s, 1);
1846 if (errval) {
1847 dput(s->s_root);
1848 s->s_root = NULL;
1849 goto error;
1850 }
1851
1852 if ((errval = reiserfs_lookup_privroot(s)) ||
1853 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1854 dput(s->s_root);
1855 s->s_root = NULL;
1856 goto error;
1857 }
1858
1859 /* look for files which were to be removed in previous session */
1860 finish_unfinished(s);
1861 } else {
1862 if (old_format_only(s) && !silent) {
1863 reiserfs_info(s, "using 3.5.x disk format\n");
1864 }
1865
1866 if ((errval = reiserfs_lookup_privroot(s)) ||
1867 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1868 dput(s->s_root);
1869 s->s_root = NULL;
1870 goto error;
1871 }
1872 }
1873 // mark hash in super block: it could be unset. overwrite should be ok
1874 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1875
1876 handle_attrs(s);
1877
1878 reiserfs_proc_info_init(s);
1879
1880 init_waitqueue_head(&(sbi->s_wait));
1881 spin_lock_init(&sbi->bitmap_lock);
1882
1883 reiserfs_write_unlock(s);
1884
1885 return (0);
1886
1887 error:
1888 if (jinit_done) { /* kill the commit thread, free journal ram */
1889 journal_release_error(NULL, s);
1890 }
1891
1892 reiserfs_write_unlock(s);
1893
1894 reiserfs_free_bitmap_cache(s);
1895 if (SB_BUFFER_WITH_SB(s))
1896 brelse(SB_BUFFER_WITH_SB(s));
1897 #ifdef CONFIG_QUOTA
1898 {
1899 int j;
1900 for (j = 0; j < MAXQUOTAS; j++)
1901 kfree(qf_names[j]);
1902 }
1903 #endif
1904 kfree(sbi);
1905
1906 s->s_fs_info = NULL;
1907 return errval;
1908 }
1909
1910 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1911 {
1912 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1913
1914 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1915 buf->f_bfree = sb_free_blocks(rs);
1916 buf->f_bavail = buf->f_bfree;
1917 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1918 buf->f_bsize = dentry->d_sb->s_blocksize;
1919 /* changed to accommodate gcc folks. */
1920 buf->f_type = REISERFS_SUPER_MAGIC;
1921 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1922 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1923 sizeof(rs->s_uuid)/2);
1924
1925 return 0;
1926 }
1927
1928 #ifdef CONFIG_QUOTA
1929 static int reiserfs_write_dquot(struct dquot *dquot)
1930 {
1931 struct reiserfs_transaction_handle th;
1932 int ret, err;
1933
1934 reiserfs_write_lock(dquot->dq_sb);
1935 ret =
1936 journal_begin(&th, dquot->dq_sb,
1937 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1938 if (ret)
1939 goto out;
1940 ret = dquot_commit(dquot);
1941 err =
1942 journal_end(&th, dquot->dq_sb,
1943 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1944 if (!ret && err)
1945 ret = err;
1946 out:
1947 reiserfs_write_unlock(dquot->dq_sb);
1948 return ret;
1949 }
1950
1951 static int reiserfs_acquire_dquot(struct dquot *dquot)
1952 {
1953 struct reiserfs_transaction_handle th;
1954 int ret, err;
1955
1956 reiserfs_write_lock(dquot->dq_sb);
1957 ret =
1958 journal_begin(&th, dquot->dq_sb,
1959 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1960 if (ret)
1961 goto out;
1962 ret = dquot_acquire(dquot);
1963 err =
1964 journal_end(&th, dquot->dq_sb,
1965 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1966 if (!ret && err)
1967 ret = err;
1968 out:
1969 reiserfs_write_unlock(dquot->dq_sb);
1970 return ret;
1971 }
1972
1973 static int reiserfs_release_dquot(struct dquot *dquot)
1974 {
1975 struct reiserfs_transaction_handle th;
1976 int ret, err;
1977
1978 reiserfs_write_lock(dquot->dq_sb);
1979 ret =
1980 journal_begin(&th, dquot->dq_sb,
1981 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1982 if (ret) {
1983 /* Release dquot anyway to avoid endless cycle in dqput() */
1984 dquot_release(dquot);
1985 goto out;
1986 }
1987 ret = dquot_release(dquot);
1988 err =
1989 journal_end(&th, dquot->dq_sb,
1990 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1991 if (!ret && err)
1992 ret = err;
1993 out:
1994 reiserfs_write_unlock(dquot->dq_sb);
1995 return ret;
1996 }
1997
1998 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1999 {
2000 /* Are we journaling quotas? */
2001 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2002 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2003 dquot_mark_dquot_dirty(dquot);
2004 return reiserfs_write_dquot(dquot);
2005 } else
2006 return dquot_mark_dquot_dirty(dquot);
2007 }
2008
2009 static int reiserfs_write_info(struct super_block *sb, int type)
2010 {
2011 struct reiserfs_transaction_handle th;
2012 int ret, err;
2013
2014 /* Data block + inode block */
2015 reiserfs_write_lock(sb);
2016 ret = journal_begin(&th, sb, 2);
2017 if (ret)
2018 goto out;
2019 ret = dquot_commit_info(sb, type);
2020 err = journal_end(&th, sb, 2);
2021 if (!ret && err)
2022 ret = err;
2023 out:
2024 reiserfs_write_unlock(sb);
2025 return ret;
2026 }
2027
2028 /*
2029 * Turn on quotas during mount time - we need to find the quota file and such...
2030 */
2031 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2032 {
2033 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2034 REISERFS_SB(sb)->s_jquota_fmt, type);
2035 }
2036
2037 /*
2038 * Standard function to be called on quota_on
2039 */
2040 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2041 char *name, int remount)
2042 {
2043 int err;
2044 struct path path;
2045 struct inode *inode;
2046 struct reiserfs_transaction_handle th;
2047
2048 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2049 return -EINVAL;
2050 /* No more checks needed? Path and format_id are bogus anyway... */
2051 if (remount)
2052 return vfs_quota_on(sb, type, format_id, name, 1);
2053 err = kern_path(name, LOOKUP_FOLLOW, &path);
2054 if (err)
2055 return err;
2056 /* Quotafile not on the same filesystem? */
2057 if (path.mnt->mnt_sb != sb) {
2058 err = -EXDEV;
2059 goto out;
2060 }
2061 inode = path.dentry->d_inode;
2062 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2063 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2064 err = reiserfs_unpack(inode, NULL);
2065 if (err) {
2066 reiserfs_warning(sb, "super-6520",
2067 "Unpacking tail of quota file failed"
2068 " (%d). Cannot turn on quotas.", err);
2069 err = -EINVAL;
2070 goto out;
2071 }
2072 mark_inode_dirty(inode);
2073 }
2074 /* Journaling quota? */
2075 if (REISERFS_SB(sb)->s_qf_names[type]) {
2076 /* Quotafile not of fs root? */
2077 if (path.dentry->d_parent != sb->s_root)
2078 reiserfs_warning(sb, "super-6521",
2079 "Quota file not on filesystem root. "
2080 "Journalled quota will not work.");
2081 }
2082
2083 /*
2084 * When we journal data on quota file, we have to flush journal to see
2085 * all updates to the file when we bypass pagecache...
2086 */
2087 if (reiserfs_file_data_log(inode)) {
2088 /* Just start temporary transaction and finish it */
2089 err = journal_begin(&th, sb, 1);
2090 if (err)
2091 goto out;
2092 err = journal_end_sync(&th, sb, 1);
2093 if (err)
2094 goto out;
2095 }
2096 err = vfs_quota_on_path(sb, type, format_id, &path);
2097 out:
2098 path_put(&path);
2099 return err;
2100 }
2101
2102 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2103 * acquiring the locks... As quota files are never truncated and quota code
2104 * itself serializes the operations (and noone else should touch the files)
2105 * we don't have to be afraid of races */
2106 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2107 size_t len, loff_t off)
2108 {
2109 struct inode *inode = sb_dqopt(sb)->files[type];
2110 unsigned long blk = off >> sb->s_blocksize_bits;
2111 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2112 size_t toread;
2113 struct buffer_head tmp_bh, *bh;
2114 loff_t i_size = i_size_read(inode);
2115
2116 if (off > i_size)
2117 return 0;
2118 if (off + len > i_size)
2119 len = i_size - off;
2120 toread = len;
2121 while (toread > 0) {
2122 tocopy =
2123 sb->s_blocksize - offset <
2124 toread ? sb->s_blocksize - offset : toread;
2125 tmp_bh.b_state = 0;
2126 /* Quota files are without tails so we can safely use this function */
2127 reiserfs_write_lock(sb);
2128 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2129 reiserfs_write_unlock(sb);
2130 if (err)
2131 return err;
2132 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2133 memset(data, 0, tocopy);
2134 else {
2135 bh = sb_bread(sb, tmp_bh.b_blocknr);
2136 if (!bh)
2137 return -EIO;
2138 memcpy(data, bh->b_data + offset, tocopy);
2139 brelse(bh);
2140 }
2141 offset = 0;
2142 toread -= tocopy;
2143 data += tocopy;
2144 blk++;
2145 }
2146 return len;
2147 }
2148
2149 /* Write to quotafile (we know the transaction is already started and has
2150 * enough credits) */
2151 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2152 const char *data, size_t len, loff_t off)
2153 {
2154 struct inode *inode = sb_dqopt(sb)->files[type];
2155 unsigned long blk = off >> sb->s_blocksize_bits;
2156 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2157 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2158 size_t towrite = len;
2159 struct buffer_head tmp_bh, *bh;
2160
2161 if (!current->journal_info) {
2162 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2163 " cancelled because transaction is not started.\n",
2164 (unsigned long long)off, (unsigned long long)len);
2165 return -EIO;
2166 }
2167 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2168 while (towrite > 0) {
2169 tocopy = sb->s_blocksize - offset < towrite ?
2170 sb->s_blocksize - offset : towrite;
2171 tmp_bh.b_state = 0;
2172 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2173 if (err)
2174 goto out;
2175 if (offset || tocopy != sb->s_blocksize)
2176 bh = sb_bread(sb, tmp_bh.b_blocknr);
2177 else
2178 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2179 if (!bh) {
2180 err = -EIO;
2181 goto out;
2182 }
2183 lock_buffer(bh);
2184 memcpy(bh->b_data + offset, data, tocopy);
2185 flush_dcache_page(bh->b_page);
2186 set_buffer_uptodate(bh);
2187 unlock_buffer(bh);
2188 reiserfs_prepare_for_journal(sb, bh, 1);
2189 journal_mark_dirty(current->journal_info, sb, bh);
2190 if (!journal_quota)
2191 reiserfs_add_ordered_list(inode, bh);
2192 brelse(bh);
2193 offset = 0;
2194 towrite -= tocopy;
2195 data += tocopy;
2196 blk++;
2197 }
2198 out:
2199 if (len == towrite) {
2200 mutex_unlock(&inode->i_mutex);
2201 return err;
2202 }
2203 if (inode->i_size < off + len - towrite)
2204 i_size_write(inode, off + len - towrite);
2205 inode->i_version++;
2206 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2207 mark_inode_dirty(inode);
2208 mutex_unlock(&inode->i_mutex);
2209 return len - towrite;
2210 }
2211
2212 #endif
2213
2214 static int get_super_block(struct file_system_type *fs_type,
2215 int flags, const char *dev_name,
2216 void *data, struct vfsmount *mnt)
2217 {
2218 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2219 mnt);
2220 }
2221
2222 static int __init init_reiserfs_fs(void)
2223 {
2224 int ret;
2225
2226 if ((ret = init_inodecache())) {
2227 return ret;
2228 }
2229
2230 reiserfs_proc_info_global_init();
2231
2232 ret = register_filesystem(&reiserfs_fs_type);
2233
2234 if (ret == 0) {
2235 return 0;
2236 }
2237
2238 reiserfs_proc_info_global_done();
2239 destroy_inodecache();
2240
2241 return ret;
2242 }
2243
2244 static void __exit exit_reiserfs_fs(void)
2245 {
2246 reiserfs_proc_info_global_done();
2247 unregister_filesystem(&reiserfs_fs_type);
2248 destroy_inodecache();
2249 }
2250
2251 struct file_system_type reiserfs_fs_type = {
2252 .owner = THIS_MODULE,
2253 .name = "reiserfs",
2254 .get_sb = get_super_block,
2255 .kill_sb = reiserfs_kill_sb,
2256 .fs_flags = FS_REQUIRES_DEV,
2257 };
2258
2259 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2260 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2261 MODULE_LICENSE("GPL");
2262
2263 module_init(init_reiserfs_fs);
2264 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree