projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / reiserfs / super.c
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/mnt_namespace.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 vfs_dq_init(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 lock_kernel();
470
471 if (s->s_dirt)
472 reiserfs_write_super(s);
473
474 /* change file system state to current state if it was mounted with read-write permissions */
475 if (!(s->s_flags & MS_RDONLY)) {
476 if (!journal_begin(&th, s, 10)) {
477 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
478 1);
479 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
480 REISERFS_SB(s)->s_mount_state);
481 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
482 }
483 }
484
485 /* note, journal_release checks for readonly mount, and can decide not
486 ** to do a journal_end
487 */
488 journal_release(&th, s);
489
490 reiserfs_free_bitmap_cache(s);
491
492 brelse(SB_BUFFER_WITH_SB(s));
493
494 print_statistics(s);
495
496 if (REISERFS_SB(s)->reserved_blocks != 0) {
497 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
498 REISERFS_SB(s)->reserved_blocks);
499 }
500
501 reiserfs_proc_info_done(s);
502
503 kfree(s->s_fs_info);
504 s->s_fs_info = NULL;
505
506 unlock_kernel();
507 }
508
509 static struct kmem_cache *reiserfs_inode_cachep;
510
511 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
512 {
513 struct reiserfs_inode_info *ei;
514 ei = (struct reiserfs_inode_info *)
515 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
516 if (!ei)
517 return NULL;
518 return &ei->vfs_inode;
519 }
520
521 static void reiserfs_destroy_inode(struct inode *inode)
522 {
523 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
524 }
525
526 static void init_once(void *foo)
527 {
528 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
529
530 INIT_LIST_HEAD(&ei->i_prealloc_list);
531 inode_init_once(&ei->vfs_inode);
532 }
533
534 static int init_inodecache(void)
535 {
536 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
537 sizeof(struct
538 reiserfs_inode_info),
539 0, (SLAB_RECLAIM_ACCOUNT|
540 SLAB_MEM_SPREAD),
541 init_once);
542 if (reiserfs_inode_cachep == NULL)
543 return -ENOMEM;
544 return 0;
545 }
546
547 static void destroy_inodecache(void)
548 {
549 kmem_cache_destroy(reiserfs_inode_cachep);
550 }
551
552 /* we don't mark inodes dirty, we just log them */
553 static void reiserfs_dirty_inode(struct inode *inode)
554 {
555 struct reiserfs_transaction_handle th;
556
557 int err = 0;
558 if (inode->i_sb->s_flags & MS_RDONLY) {
559 reiserfs_warning(inode->i_sb, "clm-6006",
560 "writing inode %lu on readonly FS",
561 inode->i_ino);
562 return;
563 }
564 reiserfs_write_lock(inode->i_sb);
565
566 /* this is really only used for atime updates, so they don't have
567 ** to be included in O_SYNC or fsync
568 */
569 err = journal_begin(&th, inode->i_sb, 1);
570 if (err) {
571 reiserfs_write_unlock(inode->i_sb);
572 return;
573 }
574 reiserfs_update_sd(&th, inode);
575 journal_end(&th, inode->i_sb, 1);
576 reiserfs_write_unlock(inode->i_sb);
577 }
578
579 #ifdef CONFIG_QUOTA
580 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
581 size_t, loff_t);
582 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
583 loff_t);
584 #endif
585
586 static const struct super_operations reiserfs_sops = {
587 .alloc_inode = reiserfs_alloc_inode,
588 .destroy_inode = reiserfs_destroy_inode,
589 .write_inode = reiserfs_write_inode,
590 .dirty_inode = reiserfs_dirty_inode,
591 .delete_inode = reiserfs_delete_inode,
592 .put_super = reiserfs_put_super,
593 .write_super = reiserfs_write_super,
594 .sync_fs = reiserfs_sync_fs,
595 .freeze_fs = reiserfs_freeze,
596 .unfreeze_fs = reiserfs_unfreeze,
597 .statfs = reiserfs_statfs,
598 .remount_fs = reiserfs_remount,
599 .show_options = generic_show_options,
600 #ifdef CONFIG_QUOTA
601 .quota_read = reiserfs_quota_read,
602 .quota_write = reiserfs_quota_write,
603 #endif
604 };
605
606 #ifdef CONFIG_QUOTA
607 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
608
609 static int reiserfs_write_dquot(struct dquot *);
610 static int reiserfs_acquire_dquot(struct dquot *);
611 static int reiserfs_release_dquot(struct dquot *);
612 static int reiserfs_mark_dquot_dirty(struct dquot *);
613 static int reiserfs_write_info(struct super_block *, int);
614 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
615
616 static struct dquot_operations reiserfs_quota_operations = {
617 .initialize = dquot_initialize,
618 .drop = dquot_drop,
619 .alloc_space = dquot_alloc_space,
620 .alloc_inode = dquot_alloc_inode,
621 .free_space = dquot_free_space,
622 .free_inode = dquot_free_inode,
623 .transfer = dquot_transfer,
624 .write_dquot = reiserfs_write_dquot,
625 .acquire_dquot = reiserfs_acquire_dquot,
626 .release_dquot = reiserfs_release_dquot,
627 .mark_dirty = reiserfs_mark_dquot_dirty,
628 .write_info = reiserfs_write_info,
629 .alloc_dquot = dquot_alloc,
630 .destroy_dquot = dquot_destroy,
631 };
632
633 static struct quotactl_ops reiserfs_qctl_operations = {
634 .quota_on = reiserfs_quota_on,
635 .quota_off = vfs_quota_off,
636 .quota_sync = vfs_quota_sync,
637 .get_info = vfs_get_dqinfo,
638 .set_info = vfs_set_dqinfo,
639 .get_dqblk = vfs_get_dqblk,
640 .set_dqblk = vfs_set_dqblk,
641 };
642 #endif
643
644 static const struct export_operations reiserfs_export_ops = {
645 .encode_fh = reiserfs_encode_fh,
646 .fh_to_dentry = reiserfs_fh_to_dentry,
647 .fh_to_parent = reiserfs_fh_to_parent,
648 .get_parent = reiserfs_get_parent,
649 };
650
651 /* this struct is used in reiserfs_getopt () for containing the value for those
652 mount options that have values rather than being toggles. */
653 typedef struct {
654 char *value;
655 int setmask; /* bitmask which is to set on mount_options bitmask when this
656 value is found, 0 is no bits are to be changed. */
657 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
658 value is found, 0 is no bits are to be changed. This is
659 applied BEFORE setmask */
660 } arg_desc_t;
661
662 /* Set this bit in arg_required to allow empty arguments */
663 #define REISERFS_OPT_ALLOWEMPTY 31
664
665 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
666 mount options */
667 typedef struct {
668 char *option_name;
669 int arg_required; /* 0 if argument is not required, not 0 otherwise */
670 const arg_desc_t *values; /* list of values accepted by an option */
671 int setmask; /* bitmask which is to set on mount_options bitmask when this
672 value is found, 0 is no bits are to be changed. */
673 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
674 value is found, 0 is no bits are to be changed. This is
675 applied BEFORE setmask */
676 } opt_desc_t;
677
678 /* possible values for -o data= */
679 static const arg_desc_t logging_mode[] = {
680 {"ordered", 1 << REISERFS_DATA_ORDERED,
681 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
682 {"journal", 1 << REISERFS_DATA_LOG,
683 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
684 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
685 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
686 {.value = NULL}
687 };
688
689 /* possible values for -o barrier= */
690 static const arg_desc_t barrier_mode[] = {
691 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
692 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
693 {.value = NULL}
694 };
695
696 /* possible values for "-o block-allocator=" and bits which are to be set in
697 s_mount_opt of reiserfs specific part of in-core super block */
698 static const arg_desc_t balloc[] = {
699 {"noborder", 1 << REISERFS_NO_BORDER, 0},
700 {"border", 0, 1 << REISERFS_NO_BORDER},
701 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
702 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
703 {"test4", 1 << REISERFS_TEST4, 0},
704 {"notest4", 0, 1 << REISERFS_TEST4},
705 {NULL, 0, 0}
706 };
707
708 static const arg_desc_t tails[] = {
709 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
710 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
711 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
712 {NULL, 0, 0}
713 };
714
715 static const arg_desc_t error_actions[] = {
716 {"panic", 1 << REISERFS_ERROR_PANIC,
717 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
718 {"ro-remount", 1 << REISERFS_ERROR_RO,
719 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
720 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
721 {"continue", 1 << REISERFS_ERROR_CONTINUE,
722 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
723 #endif
724 {NULL, 0, 0},
725 };
726
727 /* proceed only one option from a list *cur - string containing of mount options
728 opts - array of options which are accepted
729 opt_arg - if option is found and requires an argument and if it is specifed
730 in the input - pointer to the argument is stored here
731 bit_flags - if option requires to set a certain bit - it is set here
732 return -1 if unknown option is found, opt->arg_required otherwise */
733 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
734 char **opt_arg, unsigned long *bit_flags)
735 {
736 char *p;
737 /* foo=bar,
738 ^ ^ ^
739 | | +-- option_end
740 | +-- arg_start
741 +-- option_start
742 */
743 const opt_desc_t *opt;
744 const arg_desc_t *arg;
745
746 p = *cur;
747
748 /* assume argument cannot contain commas */
749 *cur = strchr(p, ',');
750 if (*cur) {
751 *(*cur) = '\0';
752 (*cur)++;
753 }
754
755 if (!strncmp(p, "alloc=", 6)) {
756 /* Ugly special case, probably we should redo options parser so that
757 it can understand several arguments for some options, also so that
758 it can fill several bitfields with option values. */
759 if (reiserfs_parse_alloc_options(s, p + 6)) {
760 return -1;
761 } else {
762 return 0;
763 }
764 }
765
766 /* for every option in the list */
767 for (opt = opts; opt->option_name; opt++) {
768 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
769 if (bit_flags) {
770 if (opt->clrmask ==
771 (1 << REISERFS_UNSUPPORTED_OPT))
772 reiserfs_warning(s, "super-6500",
773 "%s not supported.\n",
774 p);
775 else
776 *bit_flags &= ~opt->clrmask;
777 if (opt->setmask ==
778 (1 << REISERFS_UNSUPPORTED_OPT))
779 reiserfs_warning(s, "super-6501",
780 "%s not supported.\n",
781 p);
782 else
783 *bit_flags |= opt->setmask;
784 }
785 break;
786 }
787 }
788 if (!opt->option_name) {
789 reiserfs_warning(s, "super-6502",
790 "unknown mount option \"%s\"", p);
791 return -1;
792 }
793
794 p += strlen(opt->option_name);
795 switch (*p) {
796 case '=':
797 if (!opt->arg_required) {
798 reiserfs_warning(s, "super-6503",
799 "the option \"%s\" does not "
800 "require an argument\n",
801 opt->option_name);
802 return -1;
803 }
804 break;
805
806 case 0:
807 if (opt->arg_required) {
808 reiserfs_warning(s, "super-6504",
809 "the option \"%s\" requires an "
810 "argument\n", opt->option_name);
811 return -1;
812 }
813 break;
814 default:
815 reiserfs_warning(s, "super-6505",
816 "head of option \"%s\" is only correct\n",
817 opt->option_name);
818 return -1;
819 }
820
821 /* move to the argument, or to next option if argument is not required */
822 p++;
823
824 if (opt->arg_required
825 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
826 && !strlen(p)) {
827 /* this catches "option=," if not allowed */
828 reiserfs_warning(s, "super-6506",
829 "empty argument for \"%s\"\n",
830 opt->option_name);
831 return -1;
832 }
833
834 if (!opt->values) {
835 /* *=NULLopt_arg contains pointer to argument */
836 *opt_arg = p;
837 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
838 }
839
840 /* values possible for this option are listed in opt->values */
841 for (arg = opt->values; arg->value; arg++) {
842 if (!strcmp(p, arg->value)) {
843 if (bit_flags) {
844 *bit_flags &= ~arg->clrmask;
845 *bit_flags |= arg->setmask;
846 }
847 return opt->arg_required;
848 }
849 }
850
851 reiserfs_warning(s, "super-6506",
852 "bad value \"%s\" for option \"%s\"\n", p,
853 opt->option_name);
854 return -1;
855 }
856
857 /* returns 0 if something is wrong in option string, 1 - otherwise */
858 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
859 unsigned long *mount_options,
860 /* after the parsing phase, contains the
861 collection of bitflags defining what
862 mount options were selected. */
863 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
864 char **jdev_name,
865 unsigned int *commit_max_age,
866 char **qf_names,
867 unsigned int *qfmt)
868 {
869 int c;
870 char *arg = NULL;
871 char *pos;
872 opt_desc_t opts[] = {
873 /* Compatibility stuff, so that -o notail for old setups still work */
874 {"tails",.arg_required = 't',.values = tails},
875 {"notail",.clrmask =
876 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
877 {"conv",.setmask = 1 << REISERFS_CONVERT},
878 {"attrs",.setmask = 1 << REISERFS_ATTRS},
879 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
880 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
881 #ifdef CONFIG_REISERFS_FS_XATTR
882 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
883 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
884 #else
885 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
886 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
887 #endif
888 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
889 {"acl",.setmask = 1 << REISERFS_POSIXACL},
890 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
891 #else
892 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
893 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
894 #endif
895 {.option_name = "nolog"},
896 {"replayonly",.setmask = 1 << REPLAYONLY},
897 {"block-allocator",.arg_required = 'a',.values = balloc},
898 {"data",.arg_required = 'd',.values = logging_mode},
899 {"barrier",.arg_required = 'b',.values = barrier_mode},
900 {"resize",.arg_required = 'r',.values = NULL},
901 {"jdev",.arg_required = 'j',.values = NULL},
902 {"nolargeio",.arg_required = 'w',.values = NULL},
903 {"commit",.arg_required = 'c',.values = NULL},
904 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
905 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
906 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
907 {"errors",.arg_required = 'e',.values = error_actions},
908 {"usrjquota",.arg_required =
909 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
910 {"grpjquota",.arg_required =
911 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912 {"jqfmt",.arg_required = 'f',.values = NULL},
913 {.option_name = NULL}
914 };
915
916 *blocks = 0;
917 if (!options || !*options)
918 /* use default configuration: create tails, journaling on, no
919 conversion to newest format */
920 return 1;
921
922 for (pos = options; pos;) {
923 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
924 if (c == -1)
925 /* wrong option is given */
926 return 0;
927
928 if (c == 'r') {
929 char *p;
930
931 p = NULL;
932 /* "resize=NNN" or "resize=auto" */
933
934 if (!strcmp(arg, "auto")) {
935 /* From JFS code, to auto-get the size. */
936 *blocks =
937 s->s_bdev->bd_inode->i_size >> s->
938 s_blocksize_bits;
939 } else {
940 *blocks = simple_strtoul(arg, &p, 0);
941 if (*p != '\0') {
942 /* NNN does not look like a number */
943 reiserfs_warning(s, "super-6507",
944 "bad value %s for "
945 "-oresize\n", arg);
946 return 0;
947 }
948 }
949 }
950
951 if (c == 'c') {
952 char *p = NULL;
953 unsigned long val = simple_strtoul(arg, &p, 0);
954 /* commit=NNN (time in seconds) */
955 if (*p != '\0' || val >= (unsigned int)-1) {
956 reiserfs_warning(s, "super-6508",
957 "bad value %s for -ocommit\n",
958 arg);
959 return 0;
960 }
961 *commit_max_age = (unsigned int)val;
962 }
963
964 if (c == 'w') {
965 reiserfs_warning(s, "super-6509", "nolargeio option "
966 "is no longer supported");
967 return 0;
968 }
969
970 if (c == 'j') {
971 if (arg && *arg && jdev_name) {
972 if (*jdev_name) { //Hm, already assigned?
973 reiserfs_warning(s, "super-6510",
974 "journal device was "
975 "already specified to "
976 "be %s", *jdev_name);
977 return 0;
978 }
979 *jdev_name = arg;
980 }
981 }
982 #ifdef CONFIG_QUOTA
983 if (c == 'u' || c == 'g') {
984 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
985
986 if (sb_any_quota_loaded(s) &&
987 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
988 reiserfs_warning(s, "super-6511",
989 "cannot change journaled "
990 "quota options when quota "
991 "turned on.");
992 return 0;
993 }
994 if (*arg) { /* Some filename specified? */
995 if (REISERFS_SB(s)->s_qf_names[qtype]
996 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
997 arg)) {
998 reiserfs_warning(s, "super-6512",
999 "%s quota file "
1000 "already specified.",
1001 QTYPE2NAME(qtype));
1002 return 0;
1003 }
1004 if (strchr(arg, '/')) {
1005 reiserfs_warning(s, "super-6513",
1006 "quotafile must be "
1007 "on filesystem root.");
1008 return 0;
1009 }
1010 qf_names[qtype] =
1011 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1012 if (!qf_names[qtype]) {
1013 reiserfs_warning(s, "reiserfs-2502",
1014 "not enough memory "
1015 "for storing "
1016 "quotafile name.");
1017 return 0;
1018 }
1019 strcpy(qf_names[qtype], arg);
1020 *mount_options |= 1 << REISERFS_QUOTA;
1021 } else {
1022 if (qf_names[qtype] !=
1023 REISERFS_SB(s)->s_qf_names[qtype])
1024 kfree(qf_names[qtype]);
1025 qf_names[qtype] = NULL;
1026 }
1027 }
1028 if (c == 'f') {
1029 if (!strcmp(arg, "vfsold"))
1030 *qfmt = QFMT_VFS_OLD;
1031 else if (!strcmp(arg, "vfsv0"))
1032 *qfmt = QFMT_VFS_V0;
1033 else {
1034 reiserfs_warning(s, "super-6514",
1035 "unknown quota format "
1036 "specified.");
1037 return 0;
1038 }
1039 if (sb_any_quota_loaded(s) &&
1040 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1041 reiserfs_warning(s, "super-6515",
1042 "cannot change journaled "
1043 "quota options when quota "
1044 "turned on.");
1045 return 0;
1046 }
1047 }
1048 #else
1049 if (c == 'u' || c == 'g' || c == 'f') {
1050 reiserfs_warning(s, "reiserfs-2503", "journaled "
1051 "quota options not supported.");
1052 return 0;
1053 }
1054 #endif
1055 }
1056
1057 #ifdef CONFIG_QUOTA
1058 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1059 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1060 reiserfs_warning(s, "super-6515",
1061 "journaled quota format not specified.");
1062 return 0;
1063 }
1064 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1065 if (!(*mount_options & (1 << REISERFS_QUOTA))
1066 && sb_any_quota_loaded(s)) {
1067 reiserfs_warning(s, "super-6516", "quota options must "
1068 "be present when quota is turned on.");
1069 return 0;
1070 }
1071 #endif
1072
1073 return 1;
1074 }
1075
1076 static void switch_data_mode(struct super_block *s, unsigned long mode)
1077 {
1078 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1079 (1 << REISERFS_DATA_ORDERED) |
1080 (1 << REISERFS_DATA_WRITEBACK));
1081 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1082 }
1083
1084 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1085 {
1086 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1087 if (!reiserfs_data_log(s)) {
1088 switch_data_mode(s, REISERFS_DATA_LOG);
1089 reiserfs_info(s, "switching to journaled data mode\n");
1090 }
1091 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1092 if (!reiserfs_data_ordered(s)) {
1093 switch_data_mode(s, REISERFS_DATA_ORDERED);
1094 reiserfs_info(s, "switching to ordered data mode\n");
1095 }
1096 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1097 if (!reiserfs_data_writeback(s)) {
1098 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1099 reiserfs_info(s, "switching to writeback data mode\n");
1100 }
1101 }
1102 }
1103
1104 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1105 {
1106 int flush = (1 << REISERFS_BARRIER_FLUSH);
1107 int none = (1 << REISERFS_BARRIER_NONE);
1108 int all_barrier = flush | none;
1109
1110 if (bits & all_barrier) {
1111 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1112 if (bits & flush) {
1113 REISERFS_SB(s)->s_mount_opt |= flush;
1114 printk("reiserfs: enabling write barrier flush mode\n");
1115 } else if (bits & none) {
1116 REISERFS_SB(s)->s_mount_opt |= none;
1117 printk("reiserfs: write barriers turned off\n");
1118 }
1119 }
1120 }
1121
1122 static void handle_attrs(struct super_block *s)
1123 {
1124 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1125
1126 if (reiserfs_attrs(s)) {
1127 if (old_format_only(s)) {
1128 reiserfs_warning(s, "super-6517", "cannot support "
1129 "attributes on 3.5.x disk format");
1130 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1131 return;
1132 }
1133 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1134 reiserfs_warning(s, "super-6518", "cannot support "
1135 "attributes until flag is set in "
1136 "super-block");
1137 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1138 }
1139 }
1140 }
1141
1142 #ifdef CONFIG_QUOTA
1143 static void handle_quota_files(struct super_block *s, char **qf_names,
1144 unsigned int *qfmt)
1145 {
1146 int i;
1147
1148 for (i = 0; i < MAXQUOTAS; i++) {
1149 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1150 kfree(REISERFS_SB(s)->s_qf_names[i]);
1151 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1152 }
1153 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1154 }
1155 #endif
1156
1157 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1158 {
1159 struct reiserfs_super_block *rs;
1160 struct reiserfs_transaction_handle th;
1161 unsigned long blocks;
1162 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1163 unsigned long safe_mask = 0;
1164 unsigned int commit_max_age = (unsigned int)-1;
1165 struct reiserfs_journal *journal = SB_JOURNAL(s);
1166 char *new_opts = kstrdup(arg, GFP_KERNEL);
1167 int err;
1168 char *qf_names[MAXQUOTAS];
1169 unsigned int qfmt = 0;
1170 #ifdef CONFIG_QUOTA
1171 int i;
1172
1173 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1174 #endif
1175
1176 lock_kernel();
1177 rs = SB_DISK_SUPER_BLOCK(s);
1178
1179 if (!reiserfs_parse_options
1180 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1181 qf_names, &qfmt)) {
1182 #ifdef CONFIG_QUOTA
1183 for (i = 0; i < MAXQUOTAS; i++)
1184 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1185 kfree(qf_names[i]);
1186 #endif
1187 err = -EINVAL;
1188 goto out_err;
1189 }
1190 #ifdef CONFIG_QUOTA
1191 handle_quota_files(s, qf_names, &qfmt);
1192 #endif
1193
1194 handle_attrs(s);
1195
1196 /* Add options that are safe here */
1197 safe_mask |= 1 << REISERFS_SMALLTAIL;
1198 safe_mask |= 1 << REISERFS_LARGETAIL;
1199 safe_mask |= 1 << REISERFS_NO_BORDER;
1200 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1201 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1202 safe_mask |= 1 << REISERFS_TEST4;
1203 safe_mask |= 1 << REISERFS_ATTRS;
1204 safe_mask |= 1 << REISERFS_XATTRS_USER;
1205 safe_mask |= 1 << REISERFS_POSIXACL;
1206 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1207 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1208 safe_mask |= 1 << REISERFS_ERROR_RO;
1209 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1210 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1211 safe_mask |= 1 << REISERFS_QUOTA;
1212
1213 /* Update the bitmask, taking care to keep
1214 * the bits we're not allowed to change here */
1215 REISERFS_SB(s)->s_mount_opt =
1216 (REISERFS_SB(s)->
1217 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1218
1219 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1220 journal->j_max_commit_age = commit_max_age;
1221 journal->j_max_trans_age = commit_max_age;
1222 } else if (commit_max_age == 0) {
1223 /* 0 means restore defaults. */
1224 journal->j_max_commit_age = journal->j_default_max_commit_age;
1225 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1226 }
1227
1228 if (blocks) {
1229 err = reiserfs_resize(s, blocks);
1230 if (err != 0)
1231 goto out_err;
1232 }
1233
1234 if (*mount_flags & MS_RDONLY) {
1235 reiserfs_xattr_init(s, *mount_flags);
1236 /* remount read-only */
1237 if (s->s_flags & MS_RDONLY)
1238 /* it is read-only already */
1239 goto out_ok;
1240 /* try to remount file system with read-only permissions */
1241 if (sb_umount_state(rs) == REISERFS_VALID_FS
1242 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1243 goto out_ok;
1244 }
1245
1246 err = journal_begin(&th, s, 10);
1247 if (err)
1248 goto out_err;
1249
1250 /* Mounting a rw partition read-only. */
1251 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1252 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1253 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1254 } else {
1255 /* remount read-write */
1256 if (!(s->s_flags & MS_RDONLY)) {
1257 reiserfs_xattr_init(s, *mount_flags);
1258 goto out_ok; /* We are read-write already */
1259 }
1260
1261 if (reiserfs_is_journal_aborted(journal)) {
1262 err = journal->j_errno;
1263 goto out_err;
1264 }
1265
1266 handle_data_mode(s, mount_options);
1267 handle_barrier_mode(s, mount_options);
1268 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1269 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1270 err = journal_begin(&th, s, 10);
1271 if (err)
1272 goto out_err;
1273
1274 /* Mount a partition which is read-only, read-write */
1275 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1276 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1277 s->s_flags &= ~MS_RDONLY;
1278 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1279 if (!old_format_only(s))
1280 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1281 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1282 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1283 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1284 }
1285 /* this will force a full flush of all journal lists */
1286 SB_JOURNAL(s)->j_must_wait = 1;
1287 err = journal_end(&th, s, 10);
1288 if (err)
1289 goto out_err;
1290 s->s_dirt = 0;
1291
1292 if (!(*mount_flags & MS_RDONLY)) {
1293 finish_unfinished(s);
1294 reiserfs_xattr_init(s, *mount_flags);
1295 }
1296
1297 out_ok:
1298 replace_mount_options(s, new_opts);
1299 unlock_kernel();
1300 return 0;
1301
1302 out_err:
1303 kfree(new_opts);
1304 unlock_kernel();
1305 return err;
1306 }
1307
1308 static int read_super_block(struct super_block *s, int offset)
1309 {
1310 struct buffer_head *bh;
1311 struct reiserfs_super_block *rs;
1312 int fs_blocksize;
1313
1314 bh = sb_bread(s, offset / s->s_blocksize);
1315 if (!bh) {
1316 reiserfs_warning(s, "sh-2006",
1317 "bread failed (dev %s, block %lu, size %lu)",
1318 reiserfs_bdevname(s), offset / s->s_blocksize,
1319 s->s_blocksize);
1320 return 1;
1321 }
1322
1323 rs = (struct reiserfs_super_block *)bh->b_data;
1324 if (!is_any_reiserfs_magic_string(rs)) {
1325 brelse(bh);
1326 return 1;
1327 }
1328 //
1329 // ok, reiserfs signature (old or new) found in at the given offset
1330 //
1331 fs_blocksize = sb_blocksize(rs);
1332 brelse(bh);
1333 sb_set_blocksize(s, fs_blocksize);
1334
1335 bh = sb_bread(s, offset / s->s_blocksize);
1336 if (!bh) {
1337 reiserfs_warning(s, "sh-2007",
1338 "bread failed (dev %s, block %lu, size %lu)",
1339 reiserfs_bdevname(s), offset / s->s_blocksize,
1340 s->s_blocksize);
1341 return 1;
1342 }
1343
1344 rs = (struct reiserfs_super_block *)bh->b_data;
1345 if (sb_blocksize(rs) != s->s_blocksize) {
1346 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1347 "filesystem on (dev %s, block %Lu, size %lu)",
1348 reiserfs_bdevname(s),
1349 (unsigned long long)bh->b_blocknr,
1350 s->s_blocksize);
1351 brelse(bh);
1352 return 1;
1353 }
1354
1355 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1356 brelse(bh);
1357 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1358 "--rebuild-tree run detected. Please run\n"
1359 "reiserfsck --rebuild-tree and wait for a "
1360 "completion. If that fails\n"
1361 "get newer reiserfsprogs package");
1362 return 1;
1363 }
1364
1365 SB_BUFFER_WITH_SB(s) = bh;
1366 SB_DISK_SUPER_BLOCK(s) = rs;
1367
1368 if (is_reiserfs_jr(rs)) {
1369 /* magic is of non-standard journal filesystem, look at s_version to
1370 find which format is in use */
1371 if (sb_version(rs) == REISERFS_VERSION_2)
1372 reiserfs_info(s, "found reiserfs format \"3.6\""
1373 " with non-standard journal\n");
1374 else if (sb_version(rs) == REISERFS_VERSION_1)
1375 reiserfs_info(s, "found reiserfs format \"3.5\""
1376 " with non-standard journal\n");
1377 else {
1378 reiserfs_warning(s, "sh-2012", "found unknown "
1379 "format \"%u\" of reiserfs with "
1380 "non-standard magic", sb_version(rs));
1381 return 1;
1382 }
1383 } else
1384 /* s_version of standard format may contain incorrect information,
1385 so we just look at the magic string */
1386 reiserfs_info(s,
1387 "found reiserfs format \"%s\" with standard journal\n",
1388 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1389
1390 s->s_op = &reiserfs_sops;
1391 s->s_export_op = &reiserfs_export_ops;
1392 #ifdef CONFIG_QUOTA
1393 s->s_qcop = &reiserfs_qctl_operations;
1394 s->dq_op = &reiserfs_quota_operations;
1395 #endif
1396
1397 /* new format is limited by the 32 bit wide i_blocks field, want to
1398 ** be one full block below that.
1399 */
1400 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1401 return 0;
1402 }
1403
1404 /* after journal replay, reread all bitmap and super blocks */
1405 static int reread_meta_blocks(struct super_block *s)
1406 {
1407 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1408 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1409 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1410 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1411 return 1;
1412 }
1413
1414 return 0;
1415 }
1416
1417 /////////////////////////////////////////////////////
1418 // hash detection stuff
1419
1420 // if root directory is empty - we set default - Yura's - hash and
1421 // warn about it
1422 // FIXME: we look for only one name in a directory. If tea and yura
1423 // bith have the same value - we ask user to send report to the
1424 // mailing list
1425 static __u32 find_hash_out(struct super_block *s)
1426 {
1427 int retval;
1428 struct inode *inode;
1429 struct cpu_key key;
1430 INITIALIZE_PATH(path);
1431 struct reiserfs_dir_entry de;
1432 __u32 hash = DEFAULT_HASH;
1433
1434 inode = s->s_root->d_inode;
1435
1436 do { // Some serious "goto"-hater was there ;)
1437 u32 teahash, r5hash, yurahash;
1438
1439 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1440 retval = search_by_entry_key(s, &key, &path, &de);
1441 if (retval == IO_ERROR) {
1442 pathrelse(&path);
1443 return UNSET_HASH;
1444 }
1445 if (retval == NAME_NOT_FOUND)
1446 de.de_entry_num--;
1447 set_de_name_and_namelen(&de);
1448 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1449 /* allow override in this case */
1450 if (reiserfs_rupasov_hash(s)) {
1451 hash = YURA_HASH;
1452 }
1453 reiserfs_info(s, "FS seems to be empty, autodetect "
1454 "is using the default hash\n");
1455 break;
1456 }
1457 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1458 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1459 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1460 if (((teahash == r5hash)
1461 &&
1462 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1463 == r5hash)) || ((teahash == yurahash)
1464 && (yurahash ==
1465 GET_HASH_VALUE(deh_offset
1466 (&
1467 (de.
1468 de_deh[de.
1469 de_entry_num])))))
1470 || ((r5hash == yurahash)
1471 && (yurahash ==
1472 GET_HASH_VALUE(deh_offset
1473 (&(de.de_deh[de.de_entry_num])))))) {
1474 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1475 "automatically detect hash function. "
1476 "Please mount with -o "
1477 "hash={tea,rupasov,r5}");
1478 hash = UNSET_HASH;
1479 break;
1480 }
1481 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1482 yurahash)
1483 hash = YURA_HASH;
1484 else if (GET_HASH_VALUE
1485 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1486 hash = TEA_HASH;
1487 else if (GET_HASH_VALUE
1488 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1489 hash = R5_HASH;
1490 else {
1491 reiserfs_warning(s, "reiserfs-2506",
1492 "Unrecognised hash function");
1493 hash = UNSET_HASH;
1494 }
1495 } while (0);
1496
1497 pathrelse(&path);
1498 return hash;
1499 }
1500
1501 // finds out which hash names are sorted with
1502 static int what_hash(struct super_block *s)
1503 {
1504 __u32 code;
1505
1506 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1507
1508 /* reiserfs_hash_detect() == true if any of the hash mount options
1509 ** were used. We must check them to make sure the user isn't
1510 ** using a bad hash value
1511 */
1512 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1513 code = find_hash_out(s);
1514
1515 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1516 /* detection has found the hash, and we must check against the
1517 ** mount options
1518 */
1519 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1520 reiserfs_warning(s, "reiserfs-2507",
1521 "Error, %s hash detected, "
1522 "unable to force rupasov hash",
1523 reiserfs_hashname(code));
1524 code = UNSET_HASH;
1525 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1526 reiserfs_warning(s, "reiserfs-2508",
1527 "Error, %s hash detected, "
1528 "unable to force tea hash",
1529 reiserfs_hashname(code));
1530 code = UNSET_HASH;
1531 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1532 reiserfs_warning(s, "reiserfs-2509",
1533 "Error, %s hash detected, "
1534 "unable to force r5 hash",
1535 reiserfs_hashname(code));
1536 code = UNSET_HASH;
1537 }
1538 } else {
1539 /* find_hash_out was not called or could not determine the hash */
1540 if (reiserfs_rupasov_hash(s)) {
1541 code = YURA_HASH;
1542 } else if (reiserfs_tea_hash(s)) {
1543 code = TEA_HASH;
1544 } else if (reiserfs_r5_hash(s)) {
1545 code = R5_HASH;
1546 }
1547 }
1548
1549 /* if we are mounted RW, and we have a new valid hash code, update
1550 ** the super
1551 */
1552 if (code != UNSET_HASH &&
1553 !(s->s_flags & MS_RDONLY) &&
1554 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1555 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1556 }
1557 return code;
1558 }
1559
1560 // return pointer to appropriate function
1561 static hashf_t hash_function(struct super_block *s)
1562 {
1563 switch (what_hash(s)) {
1564 case TEA_HASH:
1565 reiserfs_info(s, "Using tea hash to sort names\n");
1566 return keyed_hash;
1567 case YURA_HASH:
1568 reiserfs_info(s, "Using rupasov hash to sort names\n");
1569 return yura_hash;
1570 case R5_HASH:
1571 reiserfs_info(s, "Using r5 hash to sort names\n");
1572 return r5_hash;
1573 }
1574 return NULL;
1575 }
1576
1577 // this is used to set up correct value for old partitions
1578 static int function2code(hashf_t func)
1579 {
1580 if (func == keyed_hash)
1581 return TEA_HASH;
1582 if (func == yura_hash)
1583 return YURA_HASH;
1584 if (func == r5_hash)
1585 return R5_HASH;
1586
1587 BUG(); // should never happen
1588
1589 return 0;
1590 }
1591
1592 #define SWARN(silent, s, id, ...) \
1593 if (!(silent)) \
1594 reiserfs_warning(s, id, __VA_ARGS__)
1595
1596 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1597 {
1598 struct inode *root_inode;
1599 struct reiserfs_transaction_handle th;
1600 int old_format = 0;
1601 unsigned long blocks;
1602 unsigned int commit_max_age = 0;
1603 int jinit_done = 0;
1604 struct reiserfs_iget_args args;
1605 struct reiserfs_super_block *rs;
1606 char *jdev_name;
1607 struct reiserfs_sb_info *sbi;
1608 int errval = -EINVAL;
1609 char *qf_names[MAXQUOTAS] = {};
1610 unsigned int qfmt = 0;
1611
1612 save_mount_options(s, data);
1613
1614 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1615 if (!sbi) {
1616 errval = -ENOMEM;
1617 goto error;
1618 }
1619 s->s_fs_info = sbi;
1620 /* Set default values for options: non-aggressive tails, RO on errors */
1621 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1622 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1623 /* no preallocation minimum, be smart in
1624 reiserfs_file_write instead */
1625 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1626 /* Preallocate by 16 blocks (17-1) at once */
1627 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1628 /* setup default block allocator options */
1629 reiserfs_init_alloc_options(s);
1630
1631 jdev_name = NULL;
1632 if (reiserfs_parse_options
1633 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1634 &commit_max_age, qf_names, &qfmt) == 0) {
1635 goto error;
1636 }
1637 #ifdef CONFIG_QUOTA
1638 handle_quota_files(s, qf_names, &qfmt);
1639 #endif
1640
1641 if (blocks) {
1642 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1643 goto error;
1644 }
1645
1646 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1647 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1648 old_format = 1;
1649 /* try new format (64-th 1k block), which can contain reiserfs super block */
1650 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1651 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1652 reiserfs_bdevname(s));
1653 goto error;
1654 }
1655
1656 rs = SB_DISK_SUPER_BLOCK(s);
1657 /* Let's do basic sanity check to verify that underlying device is not
1658 smaller than the filesystem. If the check fails then abort and scream,
1659 because bad stuff will happen otherwise. */
1660 if (s->s_bdev && s->s_bdev->bd_inode
1661 && i_size_read(s->s_bdev->bd_inode) <
1662 sb_block_count(rs) * sb_blocksize(rs)) {
1663 SWARN(silent, s, "", "Filesystem cannot be "
1664 "mounted because it is bigger than the device");
1665 SWARN(silent, s, "", "You may need to run fsck "
1666 "or increase size of your LVM partition");
1667 SWARN(silent, s, "", "Or may be you forgot to "
1668 "reboot after fdisk when it told you to");
1669 goto error;
1670 }
1671
1672 sbi->s_mount_state = SB_REISERFS_STATE(s);
1673 sbi->s_mount_state = REISERFS_VALID_FS;
1674
1675 if ((errval = reiserfs_init_bitmap_cache(s))) {
1676 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1677 goto error;
1678 }
1679 errval = -EINVAL;
1680 #ifdef CONFIG_REISERFS_CHECK
1681 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1682 SWARN(silent, s, "", "- it is slow mode for debugging.");
1683 #endif
1684
1685 /* make data=ordered the default */
1686 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1687 !reiserfs_data_writeback(s)) {
1688 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1689 }
1690
1691 if (reiserfs_data_log(s)) {
1692 reiserfs_info(s, "using journaled data mode\n");
1693 } else if (reiserfs_data_ordered(s)) {
1694 reiserfs_info(s, "using ordered data mode\n");
1695 } else {
1696 reiserfs_info(s, "using writeback data mode\n");
1697 }
1698 if (reiserfs_barrier_flush(s)) {
1699 printk("reiserfs: using flush barriers\n");
1700 }
1701 // set_device_ro(s->s_dev, 1) ;
1702 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1703 SWARN(silent, s, "sh-2022",
1704 "unable to initialize journal space");
1705 goto error;
1706 } else {
1707 jinit_done = 1; /* once this is set, journal_release must be called
1708 ** if we error out of the mount
1709 */
1710 }
1711 if (reread_meta_blocks(s)) {
1712 SWARN(silent, s, "jmacd-9",
1713 "unable to reread meta blocks after journal init");
1714 goto error;
1715 }
1716
1717 if (replay_only(s))
1718 goto error;
1719
1720 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1721 SWARN(silent, s, "clm-7000",
1722 "Detected readonly device, marking FS readonly");
1723 s->s_flags |= MS_RDONLY;
1724 }
1725 args.objectid = REISERFS_ROOT_OBJECTID;
1726 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1727 root_inode =
1728 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1729 reiserfs_init_locked_inode, (void *)(&args));
1730 if (!root_inode) {
1731 SWARN(silent, s, "jmacd-10", "get root inode failed");
1732 goto error;
1733 }
1734
1735 if (root_inode->i_state & I_NEW) {
1736 reiserfs_read_locked_inode(root_inode, &args);
1737 unlock_new_inode(root_inode);
1738 }
1739
1740 s->s_root = d_alloc_root(root_inode);
1741 if (!s->s_root) {
1742 iput(root_inode);
1743 goto error;
1744 }
1745 // define and initialize hash function
1746 sbi->s_hash_function = hash_function(s);
1747 if (sbi->s_hash_function == NULL) {
1748 dput(s->s_root);
1749 s->s_root = NULL;
1750 goto error;
1751 }
1752
1753 if (is_reiserfs_3_5(rs)
1754 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1755 set_bit(REISERFS_3_5, &(sbi->s_properties));
1756 else if (old_format)
1757 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1758 else
1759 set_bit(REISERFS_3_6, &(sbi->s_properties));
1760
1761 if (!(s->s_flags & MS_RDONLY)) {
1762
1763 errval = journal_begin(&th, s, 1);
1764 if (errval) {
1765 dput(s->s_root);
1766 s->s_root = NULL;
1767 goto error;
1768 }
1769 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1770
1771 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1772 set_sb_fs_state(rs, 0);
1773
1774 /* Clear out s_bmap_nr if it would wrap. We can handle this
1775 * case, but older revisions can't. This will cause the
1776 * file system to fail mount on those older implementations,
1777 * avoiding corruption. -jeffm */
1778 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1779 sb_bmap_nr(rs) != 0) {
1780 reiserfs_warning(s, "super-2030", "This file system "
1781 "claims to use %u bitmap blocks in "
1782 "its super block, but requires %u. "
1783 "Clearing to zero.", sb_bmap_nr(rs),
1784 reiserfs_bmap_count(s));
1785
1786 set_sb_bmap_nr(rs, 0);
1787 }
1788
1789 if (old_format_only(s)) {
1790 /* filesystem of format 3.5 either with standard or non-standard
1791 journal */
1792 if (convert_reiserfs(s)) {
1793 /* and -o conv is given */
1794 if (!silent)
1795 reiserfs_info(s,
1796 "converting 3.5 filesystem to the 3.6 format");
1797
1798 if (is_reiserfs_3_5(rs))
1799 /* put magic string of 3.6 format. 2.2 will not be able to
1800 mount this filesystem anymore */
1801 memcpy(rs->s_v1.s_magic,
1802 reiserfs_3_6_magic_string,
1803 sizeof
1804 (reiserfs_3_6_magic_string));
1805
1806 set_sb_version(rs, REISERFS_VERSION_2);
1807 reiserfs_convert_objectid_map_v1(s);
1808 set_bit(REISERFS_3_6, &(sbi->s_properties));
1809 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1810 } else if (!silent) {
1811 reiserfs_info(s, "using 3.5.x disk format\n");
1812 }
1813 } else
1814 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1815
1816
1817 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1818 errval = journal_end(&th, s, 1);
1819 if (errval) {
1820 dput(s->s_root);
1821 s->s_root = NULL;
1822 goto error;
1823 }
1824
1825 if ((errval = reiserfs_lookup_privroot(s)) ||
1826 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1827 dput(s->s_root);
1828 s->s_root = NULL;
1829 goto error;
1830 }
1831
1832 /* look for files which were to be removed in previous session */
1833 finish_unfinished(s);
1834 } else {
1835 if (old_format_only(s) && !silent) {
1836 reiserfs_info(s, "using 3.5.x disk format\n");
1837 }
1838
1839 if ((errval = reiserfs_lookup_privroot(s)) ||
1840 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1841 dput(s->s_root);
1842 s->s_root = NULL;
1843 goto error;
1844 }
1845 }
1846 // mark hash in super block: it could be unset. overwrite should be ok
1847 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1848
1849 handle_attrs(s);
1850
1851 reiserfs_proc_info_init(s);
1852
1853 init_waitqueue_head(&(sbi->s_wait));
1854 spin_lock_init(&sbi->bitmap_lock);
1855
1856 return (0);
1857
1858 error:
1859 if (jinit_done) { /* kill the commit thread, free journal ram */
1860 journal_release_error(NULL, s);
1861 }
1862
1863 reiserfs_free_bitmap_cache(s);
1864 if (SB_BUFFER_WITH_SB(s))
1865 brelse(SB_BUFFER_WITH_SB(s));
1866 #ifdef CONFIG_QUOTA
1867 {
1868 int j;
1869 for (j = 0; j < MAXQUOTAS; j++)
1870 kfree(qf_names[j]);
1871 }
1872 #endif
1873 kfree(sbi);
1874
1875 s->s_fs_info = NULL;
1876 return errval;
1877 }
1878
1879 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1880 {
1881 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1882
1883 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1884 buf->f_bfree = sb_free_blocks(rs);
1885 buf->f_bavail = buf->f_bfree;
1886 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1887 buf->f_bsize = dentry->d_sb->s_blocksize;
1888 /* changed to accommodate gcc folks. */
1889 buf->f_type = REISERFS_SUPER_MAGIC;
1890 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1891 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1892 sizeof(rs->s_uuid)/2);
1893
1894 return 0;
1895 }
1896
1897 #ifdef CONFIG_QUOTA
1898 static int reiserfs_write_dquot(struct dquot *dquot)
1899 {
1900 struct reiserfs_transaction_handle th;
1901 int ret, err;
1902
1903 reiserfs_write_lock(dquot->dq_sb);
1904 ret =
1905 journal_begin(&th, dquot->dq_sb,
1906 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1907 if (ret)
1908 goto out;
1909 ret = dquot_commit(dquot);
1910 err =
1911 journal_end(&th, dquot->dq_sb,
1912 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1913 if (!ret && err)
1914 ret = err;
1915 out:
1916 reiserfs_write_unlock(dquot->dq_sb);
1917 return ret;
1918 }
1919
1920 static int reiserfs_acquire_dquot(struct dquot *dquot)
1921 {
1922 struct reiserfs_transaction_handle th;
1923 int ret, err;
1924
1925 reiserfs_write_lock(dquot->dq_sb);
1926 ret =
1927 journal_begin(&th, dquot->dq_sb,
1928 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1929 if (ret)
1930 goto out;
1931 ret = dquot_acquire(dquot);
1932 err =
1933 journal_end(&th, dquot->dq_sb,
1934 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1935 if (!ret && err)
1936 ret = err;
1937 out:
1938 reiserfs_write_unlock(dquot->dq_sb);
1939 return ret;
1940 }
1941
1942 static int reiserfs_release_dquot(struct dquot *dquot)
1943 {
1944 struct reiserfs_transaction_handle th;
1945 int ret, err;
1946
1947 reiserfs_write_lock(dquot->dq_sb);
1948 ret =
1949 journal_begin(&th, dquot->dq_sb,
1950 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1951 if (ret) {
1952 /* Release dquot anyway to avoid endless cycle in dqput() */
1953 dquot_release(dquot);
1954 goto out;
1955 }
1956 ret = dquot_release(dquot);
1957 err =
1958 journal_end(&th, dquot->dq_sb,
1959 REISERFS_QUOTA_DEL_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_mark_dquot_dirty(struct dquot *dquot)
1968 {
1969 /* Are we journaling quotas? */
1970 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1971 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1972 dquot_mark_dquot_dirty(dquot);
1973 return reiserfs_write_dquot(dquot);
1974 } else
1975 return dquot_mark_dquot_dirty(dquot);
1976 }
1977
1978 static int reiserfs_write_info(struct super_block *sb, int type)
1979 {
1980 struct reiserfs_transaction_handle th;
1981 int ret, err;
1982
1983 /* Data block + inode block */
1984 reiserfs_write_lock(sb);
1985 ret = journal_begin(&th, sb, 2);
1986 if (ret)
1987 goto out;
1988 ret = dquot_commit_info(sb, type);
1989 err = journal_end(&th, sb, 2);
1990 if (!ret && err)
1991 ret = err;
1992 out:
1993 reiserfs_write_unlock(sb);
1994 return ret;
1995 }
1996
1997 /*
1998 * Turn on quotas during mount time - we need to find the quota file and such...
1999 */
2000 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2001 {
2002 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2003 REISERFS_SB(sb)->s_jquota_fmt, type);
2004 }
2005
2006 /*
2007 * Standard function to be called on quota_on
2008 */
2009 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2010 char *name, int remount)
2011 {
2012 int err;
2013 struct path path;
2014 struct inode *inode;
2015 struct reiserfs_transaction_handle th;
2016
2017 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2018 return -EINVAL;
2019 /* No more checks needed? Path and format_id are bogus anyway... */
2020 if (remount)
2021 return vfs_quota_on(sb, type, format_id, name, 1);
2022 err = kern_path(name, LOOKUP_FOLLOW, &path);
2023 if (err)
2024 return err;
2025 /* Quotafile not on the same filesystem? */
2026 if (path.mnt->mnt_sb != sb) {
2027 err = -EXDEV;
2028 goto out;
2029 }
2030 inode = path.dentry->d_inode;
2031 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2032 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2033 err = reiserfs_unpack(inode, NULL);
2034 if (err) {
2035 reiserfs_warning(sb, "super-6520",
2036 "Unpacking tail of quota file failed"
2037 " (%d). Cannot turn on quotas.", err);
2038 err = -EINVAL;
2039 goto out;
2040 }
2041 mark_inode_dirty(inode);
2042 }
2043 /* Journaling quota? */
2044 if (REISERFS_SB(sb)->s_qf_names[type]) {
2045 /* Quotafile not of fs root? */
2046 if (path.dentry->d_parent != sb->s_root)
2047 reiserfs_warning(sb, "super-6521",
2048 "Quota file not on filesystem root. "
2049 "Journalled quota will not work.");
2050 }
2051
2052 /*
2053 * When we journal data on quota file, we have to flush journal to see
2054 * all updates to the file when we bypass pagecache...
2055 */
2056 if (reiserfs_file_data_log(inode)) {
2057 /* Just start temporary transaction and finish it */
2058 err = journal_begin(&th, sb, 1);
2059 if (err)
2060 goto out;
2061 err = journal_end_sync(&th, sb, 1);
2062 if (err)
2063 goto out;
2064 }
2065 err = vfs_quota_on_path(sb, type, format_id, &path);
2066 out:
2067 path_put(&path);
2068 return err;
2069 }
2070
2071 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2072 * acquiring the locks... As quota files are never truncated and quota code
2073 * itself serializes the operations (and noone else should touch the files)
2074 * we don't have to be afraid of races */
2075 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2076 size_t len, loff_t off)
2077 {
2078 struct inode *inode = sb_dqopt(sb)->files[type];
2079 unsigned long blk = off >> sb->s_blocksize_bits;
2080 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2081 size_t toread;
2082 struct buffer_head tmp_bh, *bh;
2083 loff_t i_size = i_size_read(inode);
2084
2085 if (off > i_size)
2086 return 0;
2087 if (off + len > i_size)
2088 len = i_size - off;
2089 toread = len;
2090 while (toread > 0) {
2091 tocopy =
2092 sb->s_blocksize - offset <
2093 toread ? sb->s_blocksize - offset : toread;
2094 tmp_bh.b_state = 0;
2095 /* Quota files are without tails so we can safely use this function */
2096 reiserfs_write_lock(sb);
2097 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2098 reiserfs_write_unlock(sb);
2099 if (err)
2100 return err;
2101 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2102 memset(data, 0, tocopy);
2103 else {
2104 bh = sb_bread(sb, tmp_bh.b_blocknr);
2105 if (!bh)
2106 return -EIO;
2107 memcpy(data, bh->b_data + offset, tocopy);
2108 brelse(bh);
2109 }
2110 offset = 0;
2111 toread -= tocopy;
2112 data += tocopy;
2113 blk++;
2114 }
2115 return len;
2116 }
2117
2118 /* Write to quotafile (we know the transaction is already started and has
2119 * enough credits) */
2120 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2121 const char *data, size_t len, loff_t off)
2122 {
2123 struct inode *inode = sb_dqopt(sb)->files[type];
2124 unsigned long blk = off >> sb->s_blocksize_bits;
2125 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2126 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2127 size_t towrite = len;
2128 struct buffer_head tmp_bh, *bh;
2129
2130 if (!current->journal_info) {
2131 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2132 " cancelled because transaction is not started.\n",
2133 (unsigned long long)off, (unsigned long long)len);
2134 return -EIO;
2135 }
2136 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2137 while (towrite > 0) {
2138 tocopy = sb->s_blocksize - offset < towrite ?
2139 sb->s_blocksize - offset : towrite;
2140 tmp_bh.b_state = 0;
2141 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2142 if (err)
2143 goto out;
2144 if (offset || tocopy != sb->s_blocksize)
2145 bh = sb_bread(sb, tmp_bh.b_blocknr);
2146 else
2147 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2148 if (!bh) {
2149 err = -EIO;
2150 goto out;
2151 }
2152 lock_buffer(bh);
2153 memcpy(bh->b_data + offset, data, tocopy);
2154 flush_dcache_page(bh->b_page);
2155 set_buffer_uptodate(bh);
2156 unlock_buffer(bh);
2157 reiserfs_prepare_for_journal(sb, bh, 1);
2158 journal_mark_dirty(current->journal_info, sb, bh);
2159 if (!journal_quota)
2160 reiserfs_add_ordered_list(inode, bh);
2161 brelse(bh);
2162 offset = 0;
2163 towrite -= tocopy;
2164 data += tocopy;
2165 blk++;
2166 }
2167 out:
2168 if (len == towrite) {
2169 mutex_unlock(&inode->i_mutex);
2170 return err;
2171 }
2172 if (inode->i_size < off + len - towrite)
2173 i_size_write(inode, off + len - towrite);
2174 inode->i_version++;
2175 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2176 mark_inode_dirty(inode);
2177 mutex_unlock(&inode->i_mutex);
2178 return len - towrite;
2179 }
2180
2181 #endif
2182
2183 static int get_super_block(struct file_system_type *fs_type,
2184 int flags, const char *dev_name,
2185 void *data, struct vfsmount *mnt)
2186 {
2187 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2188 mnt);
2189 }
2190
2191 static int __init init_reiserfs_fs(void)
2192 {
2193 int ret;
2194
2195 if ((ret = init_inodecache())) {
2196 return ret;
2197 }
2198
2199 reiserfs_proc_info_global_init();
2200 reiserfs_proc_register_global("version",
2201 reiserfs_global_version_in_proc);
2202
2203 ret = register_filesystem(&reiserfs_fs_type);
2204
2205 if (ret == 0) {
2206 return 0;
2207 }
2208
2209 reiserfs_proc_unregister_global("version");
2210 reiserfs_proc_info_global_done();
2211 destroy_inodecache();
2212
2213 return ret;
2214 }
2215
2216 static void __exit exit_reiserfs_fs(void)
2217 {
2218 reiserfs_proc_unregister_global("version");
2219 reiserfs_proc_info_global_done();
2220 unregister_filesystem(&reiserfs_fs_type);
2221 destroy_inodecache();
2222 }
2223
2224 struct file_system_type reiserfs_fs_type = {
2225 .owner = THIS_MODULE,
2226 .name = "reiserfs",
2227 .get_sb = get_super_block,
2228 .kill_sb = reiserfs_kill_sb,
2229 .fs_flags = FS_REQUIRES_DEV,
2230 };
2231
2232 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2233 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2234 MODULE_LICENSE("GPL");
2235
2236 module_init(init_reiserfs_fs);
2237 module_exit(exit_reiserfs_fs);
kernel source for telekom puls (alcatel/mediatek)