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Input: ad7877 - filter events where pressure is beyond the maximum
[linux-2.6/cjktty.git] / fs / reiserfs / super.c
blobe15ff612002d314ee0191d5f718bc1686a80ef3d
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 int quota_enabled[MAXQUOTAS];
162 #endif
163
164 /* compose key to look for "save" links */
165 max_cpu_key.version = KEY_FORMAT_3_5;
166 max_cpu_key.on_disk_key.k_dir_id = ~0U;
167 max_cpu_key.on_disk_key.k_objectid = ~0U;
168 set_cpu_key_k_offset(&max_cpu_key, ~0U);
169 max_cpu_key.key_length = 3;
170
171 memset(&last_inode_key, 0, sizeof(last_inode_key));
172
173 #ifdef CONFIG_QUOTA
174 /* Needed for iput() to work correctly and not trash data */
175 if (s->s_flags & MS_ACTIVE) {
176 ms_active_set = 0;
177 } else {
178 ms_active_set = 1;
179 s->s_flags |= MS_ACTIVE;
180 }
181 /* Turn on quotas so that they are updated correctly */
182 for (i = 0; i < MAXQUOTAS; i++) {
183 quota_enabled[i] = 1;
184 if (REISERFS_SB(s)->s_qf_names[i]) {
185 int ret;
186
187 if (sb_has_quota_active(s, i)) {
188 quota_enabled[i] = 0;
189 continue;
190 }
191 ret = reiserfs_quota_on_mount(s, i);
192 if (ret < 0)
193 reiserfs_warning(s, "reiserfs-2500",
194 "cannot turn on journaled "
195 "quota: error %d", ret);
196 }
197 }
198 #endif
199
200 done = 0;
201 REISERFS_SB(s)->s_is_unlinked_ok = 1;
202 while (!retval) {
203 retval = search_item(s, &max_cpu_key, &path);
204 if (retval != ITEM_NOT_FOUND) {
205 reiserfs_error(s, "vs-2140",
206 "search_by_key returned %d", retval);
207 break;
208 }
209
210 bh = get_last_bh(&path);
211 item_pos = get_item_pos(&path);
212 if (item_pos != B_NR_ITEMS(bh)) {
213 reiserfs_warning(s, "vs-2060",
214 "wrong position found");
215 break;
216 }
217 item_pos--;
218 ih = B_N_PITEM_HEAD(bh, item_pos);
219
220 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
221 /* there are no "save" links anymore */
222 break;
223
224 save_link_key = ih->ih_key;
225 if (is_indirect_le_ih(ih))
226 truncate = 1;
227 else
228 truncate = 0;
229
230 /* reiserfs_iget needs k_dirid and k_objectid only */
231 item = B_I_PITEM(bh, ih);
232 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
233 obj_key.on_disk_key.k_objectid =
234 le32_to_cpu(ih->ih_key.k_objectid);
235 obj_key.on_disk_key.k_offset = 0;
236 obj_key.on_disk_key.k_type = 0;
237
238 pathrelse(&path);
239
240 inode = reiserfs_iget(s, &obj_key);
241 if (!inode) {
242 /* the unlink almost completed, it just did not manage to remove
243 "save" link and release objectid */
244 reiserfs_warning(s, "vs-2180", "iget failed for %K",
245 &obj_key);
246 retval = remove_save_link_only(s, &save_link_key, 1);
247 continue;
248 }
249
250 if (!truncate && inode->i_nlink) {
251 /* file is not unlinked */
252 reiserfs_warning(s, "vs-2185",
253 "file %K is not unlinked",
254 &obj_key);
255 retval = remove_save_link_only(s, &save_link_key, 0);
256 continue;
257 }
258 dquot_initialize(inode);
259
260 if (truncate && S_ISDIR(inode->i_mode)) {
261 /* We got a truncate request for a dir which is impossible.
262 The only imaginable way is to execute unfinished truncate request
263 then boot into old kernel, remove the file and create dir with
264 the same key. */
265 reiserfs_warning(s, "green-2101",
266 "impossible truncate on a "
267 "directory %k. Please report",
268 INODE_PKEY(inode));
269 retval = remove_save_link_only(s, &save_link_key, 0);
270 truncate = 0;
271 iput(inode);
272 continue;
273 }
274
275 if (truncate) {
276 REISERFS_I(inode)->i_flags |=
277 i_link_saved_truncate_mask;
278 /* not completed truncate found. New size was committed together
279 with "save" link */
280 reiserfs_info(s, "Truncating %k to %Ld ..",
281 INODE_PKEY(inode), inode->i_size);
282 reiserfs_truncate_file(inode,
283 0
284 /*don't update modification time */
285 );
286 retval = remove_save_link(inode, truncate);
287 } else {
288 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
289 /* not completed unlink (rmdir) found */
290 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
291 if (memcmp(&last_inode_key, INODE_PKEY(inode),
292 sizeof(last_inode_key))){
293 last_inode_key = *INODE_PKEY(inode);
294 /* removal gets completed in iput */
295 retval = 0;
296 } else {
297 reiserfs_warning(s, "super-2189", "Dead loop "
298 "in finish_unfinished "
299 "detected, just remove "
300 "save link\n");
301 retval = remove_save_link_only(s,
302 &save_link_key, 0);
303 }
304 }
305
306 iput(inode);
307 printk("done\n");
308 done++;
309 }
310 REISERFS_SB(s)->s_is_unlinked_ok = 0;
311
312 #ifdef CONFIG_QUOTA
313 /* Turn quotas off */
314 for (i = 0; i < MAXQUOTAS; i++) {
315 if (sb_dqopt(s)->files[i] && quota_enabled[i])
316 dquot_quota_off(s, i);
317 }
318 if (ms_active_set)
319 /* Restore the flag back */
320 s->s_flags &= ~MS_ACTIVE;
321 #endif
322 pathrelse(&path);
323 if (done)
324 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
325 "Completed\n", done);
326 return retval;
327 }
328
329 /* to protect file being unlinked from getting lost we "safe" link files
330 being unlinked. This link will be deleted in the same transaction with last
331 item of file. mounting the filesystem we scan all these links and remove
332 files which almost got lost */
333 void add_save_link(struct reiserfs_transaction_handle *th,
334 struct inode *inode, int truncate)
335 {
336 INITIALIZE_PATH(path);
337 int retval;
338 struct cpu_key key;
339 struct item_head ih;
340 __le32 link;
341
342 BUG_ON(!th->t_trans_id);
343
344 /* file can only get one "save link" of each kind */
345 RFALSE(truncate &&
346 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
347 "saved link already exists for truncated inode %lx",
348 (long)inode->i_ino);
349 RFALSE(!truncate &&
350 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
351 "saved link already exists for unlinked inode %lx",
352 (long)inode->i_ino);
353
354 /* setup key of "save" link */
355 key.version = KEY_FORMAT_3_5;
356 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
357 key.on_disk_key.k_objectid = inode->i_ino;
358 if (!truncate) {
359 /* unlink, rmdir, rename */
360 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
361 set_cpu_key_k_type(&key, TYPE_DIRECT);
362
363 /* item head of "safe" link */
364 make_le_item_head(&ih, &key, key.version,
365 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
366 4 /*length */ , 0xffff /*free space */ );
367 } else {
368 /* truncate */
369 if (S_ISDIR(inode->i_mode))
370 reiserfs_warning(inode->i_sb, "green-2102",
371 "Adding a truncate savelink for "
372 "a directory %k! Please report",
373 INODE_PKEY(inode));
374 set_cpu_key_k_offset(&key, 1);
375 set_cpu_key_k_type(&key, TYPE_INDIRECT);
376
377 /* item head of "safe" link */
378 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
379 4 /*length */ , 0 /*free space */ );
380 }
381 key.key_length = 3;
382
383 /* look for its place in the tree */
384 retval = search_item(inode->i_sb, &key, &path);
385 if (retval != ITEM_NOT_FOUND) {
386 if (retval != -ENOSPC)
387 reiserfs_error(inode->i_sb, "vs-2100",
388 "search_by_key (%K) returned %d", &key,
389 retval);
390 pathrelse(&path);
391 return;
392 }
393
394 /* body of "save" link */
395 link = INODE_PKEY(inode)->k_dir_id;
396
397 /* put "save" link inot tree, don't charge quota to anyone */
398 retval =
399 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
400 if (retval) {
401 if (retval != -ENOSPC)
402 reiserfs_error(inode->i_sb, "vs-2120",
403 "insert_item returned %d", retval);
404 } else {
405 if (truncate)
406 REISERFS_I(inode)->i_flags |=
407 i_link_saved_truncate_mask;
408 else
409 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
410 }
411 }
412
413 /* this opens transaction unlike add_save_link */
414 int remove_save_link(struct inode *inode, int truncate)
415 {
416 struct reiserfs_transaction_handle th;
417 struct reiserfs_key key;
418 int err;
419
420 /* we are going to do one balancing only */
421 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
422 if (err)
423 return err;
424
425 /* setup key of "save" link */
426 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
427 key.k_objectid = INODE_PKEY(inode)->k_objectid;
428 if (!truncate) {
429 /* unlink, rmdir, rename */
430 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
431 1 + inode->i_sb->s_blocksize);
432 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
433 } else {
434 /* truncate */
435 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
436 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
437 }
438
439 if ((truncate &&
440 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
441 (!truncate &&
442 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
443 /* don't take quota bytes from anywhere */
444 reiserfs_delete_solid_item(&th, NULL, &key);
445 if (!truncate) {
446 reiserfs_release_objectid(&th, inode->i_ino);
447 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
448 } else
449 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
450
451 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
452 }
453
454 static void reiserfs_kill_sb(struct super_block *s)
455 {
456 if (REISERFS_SB(s)) {
457 if (REISERFS_SB(s)->xattr_root) {
458 d_invalidate(REISERFS_SB(s)->xattr_root);
459 dput(REISERFS_SB(s)->xattr_root);
460 REISERFS_SB(s)->xattr_root = NULL;
461 }
462 if (REISERFS_SB(s)->priv_root) {
463 d_invalidate(REISERFS_SB(s)->priv_root);
464 dput(REISERFS_SB(s)->priv_root);
465 REISERFS_SB(s)->priv_root = NULL;
466 }
467 }
468
469 kill_block_super(s);
470 }
471
472 static void reiserfs_put_super(struct super_block *s)
473 {
474 struct reiserfs_transaction_handle th;
475 th.t_trans_id = 0;
476
477 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
478
479 reiserfs_write_lock(s);
480
481 if (s->s_dirt)
482 reiserfs_write_super(s);
483
484 /* change file system state to current state if it was mounted with read-write permissions */
485 if (!(s->s_flags & MS_RDONLY)) {
486 if (!journal_begin(&th, s, 10)) {
487 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
488 1);
489 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
490 REISERFS_SB(s)->s_mount_state);
491 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
492 }
493 }
494
495 /* note, journal_release checks for readonly mount, and can decide not
496 ** to do a journal_end
497 */
498 journal_release(&th, s);
499
500 reiserfs_free_bitmap_cache(s);
501
502 brelse(SB_BUFFER_WITH_SB(s));
503
504 print_statistics(s);
505
506 if (REISERFS_SB(s)->reserved_blocks != 0) {
507 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
508 REISERFS_SB(s)->reserved_blocks);
509 }
510
511 reiserfs_proc_info_done(s);
512
513 reiserfs_write_unlock(s);
514 mutex_destroy(&REISERFS_SB(s)->lock);
515 kfree(s->s_fs_info);
516 s->s_fs_info = NULL;
517 }
518
519 static struct kmem_cache *reiserfs_inode_cachep;
520
521 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
522 {
523 struct reiserfs_inode_info *ei;
524 ei = (struct reiserfs_inode_info *)
525 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
526 if (!ei)
527 return NULL;
528 atomic_set(&ei->openers, 0);
529 mutex_init(&ei->tailpack);
530 return &ei->vfs_inode;
531 }
532
533 static void reiserfs_destroy_inode(struct inode *inode)
534 {
535 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
536 }
537
538 static void init_once(void *foo)
539 {
540 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
541
542 INIT_LIST_HEAD(&ei->i_prealloc_list);
543 inode_init_once(&ei->vfs_inode);
544 }
545
546 static int init_inodecache(void)
547 {
548 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
549 sizeof(struct
550 reiserfs_inode_info),
551 0, (SLAB_RECLAIM_ACCOUNT|
552 SLAB_MEM_SPREAD),
553 init_once);
554 if (reiserfs_inode_cachep == NULL)
555 return -ENOMEM;
556 return 0;
557 }
558
559 static void destroy_inodecache(void)
560 {
561 kmem_cache_destroy(reiserfs_inode_cachep);
562 }
563
564 /* we don't mark inodes dirty, we just log them */
565 static void reiserfs_dirty_inode(struct inode *inode)
566 {
567 struct reiserfs_transaction_handle th;
568
569 int err = 0;
570 int lock_depth;
571
572 if (inode->i_sb->s_flags & MS_RDONLY) {
573 reiserfs_warning(inode->i_sb, "clm-6006",
574 "writing inode %lu on readonly FS",
575 inode->i_ino);
576 return;
577 }
578 lock_depth = reiserfs_write_lock_once(inode->i_sb);
579
580 /* this is really only used for atime updates, so they don't have
581 ** to be included in O_SYNC or fsync
582 */
583 err = journal_begin(&th, inode->i_sb, 1);
584 if (err)
585 goto out;
586
587 reiserfs_update_sd(&th, inode);
588 journal_end(&th, inode->i_sb, 1);
589
590 out:
591 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
592 }
593
594 #ifdef CONFIG_QUOTA
595 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
596 size_t, loff_t);
597 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
598 loff_t);
599 #endif
600
601 static const struct super_operations reiserfs_sops = {
602 .alloc_inode = reiserfs_alloc_inode,
603 .destroy_inode = reiserfs_destroy_inode,
604 .write_inode = reiserfs_write_inode,
605 .dirty_inode = reiserfs_dirty_inode,
606 .evict_inode = reiserfs_evict_inode,
607 .put_super = reiserfs_put_super,
608 .write_super = reiserfs_write_super,
609 .sync_fs = reiserfs_sync_fs,
610 .freeze_fs = reiserfs_freeze,
611 .unfreeze_fs = reiserfs_unfreeze,
612 .statfs = reiserfs_statfs,
613 .remount_fs = reiserfs_remount,
614 .show_options = generic_show_options,
615 #ifdef CONFIG_QUOTA
616 .quota_read = reiserfs_quota_read,
617 .quota_write = reiserfs_quota_write,
618 #endif
619 };
620
621 #ifdef CONFIG_QUOTA
622 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
623
624 static int reiserfs_write_dquot(struct dquot *);
625 static int reiserfs_acquire_dquot(struct dquot *);
626 static int reiserfs_release_dquot(struct dquot *);
627 static int reiserfs_mark_dquot_dirty(struct dquot *);
628 static int reiserfs_write_info(struct super_block *, int);
629 static int reiserfs_quota_on(struct super_block *, int, int, char *);
630
631 static const struct dquot_operations reiserfs_quota_operations = {
632 .write_dquot = reiserfs_write_dquot,
633 .acquire_dquot = reiserfs_acquire_dquot,
634 .release_dquot = reiserfs_release_dquot,
635 .mark_dirty = reiserfs_mark_dquot_dirty,
636 .write_info = reiserfs_write_info,
637 .alloc_dquot = dquot_alloc,
638 .destroy_dquot = dquot_destroy,
639 };
640
641 static const struct quotactl_ops reiserfs_qctl_operations = {
642 .quota_on = reiserfs_quota_on,
643 .quota_off = dquot_quota_off,
644 .quota_sync = dquot_quota_sync,
645 .get_info = dquot_get_dqinfo,
646 .set_info = dquot_set_dqinfo,
647 .get_dqblk = dquot_get_dqblk,
648 .set_dqblk = dquot_set_dqblk,
649 };
650 #endif
651
652 static const struct export_operations reiserfs_export_ops = {
653 .encode_fh = reiserfs_encode_fh,
654 .fh_to_dentry = reiserfs_fh_to_dentry,
655 .fh_to_parent = reiserfs_fh_to_parent,
656 .get_parent = reiserfs_get_parent,
657 };
658
659 /* this struct is used in reiserfs_getopt () for containing the value for those
660 mount options that have values rather than being toggles. */
661 typedef struct {
662 char *value;
663 int setmask; /* bitmask which is to set on mount_options bitmask when this
664 value is found, 0 is no bits are to be changed. */
665 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
666 value is found, 0 is no bits are to be changed. This is
667 applied BEFORE setmask */
668 } arg_desc_t;
669
670 /* Set this bit in arg_required to allow empty arguments */
671 #define REISERFS_OPT_ALLOWEMPTY 31
672
673 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
674 mount options */
675 typedef struct {
676 char *option_name;
677 int arg_required; /* 0 if argument is not required, not 0 otherwise */
678 const arg_desc_t *values; /* list of values accepted by an option */
679 int setmask; /* bitmask which is to set on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. */
681 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
682 value is found, 0 is no bits are to be changed. This is
683 applied BEFORE setmask */
684 } opt_desc_t;
685
686 /* possible values for -o data= */
687 static const arg_desc_t logging_mode[] = {
688 {"ordered", 1 << REISERFS_DATA_ORDERED,
689 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
690 {"journal", 1 << REISERFS_DATA_LOG,
691 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
692 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
693 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
694 {.value = NULL}
695 };
696
697 /* possible values for -o barrier= */
698 static const arg_desc_t barrier_mode[] = {
699 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
700 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
701 {.value = NULL}
702 };
703
704 /* possible values for "-o block-allocator=" and bits which are to be set in
705 s_mount_opt of reiserfs specific part of in-core super block */
706 static const arg_desc_t balloc[] = {
707 {"noborder", 1 << REISERFS_NO_BORDER, 0},
708 {"border", 0, 1 << REISERFS_NO_BORDER},
709 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
710 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
711 {"test4", 1 << REISERFS_TEST4, 0},
712 {"notest4", 0, 1 << REISERFS_TEST4},
713 {NULL, 0, 0}
714 };
715
716 static const arg_desc_t tails[] = {
717 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
718 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
719 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
720 {NULL, 0, 0}
721 };
722
723 static const arg_desc_t error_actions[] = {
724 {"panic", 1 << REISERFS_ERROR_PANIC,
725 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
726 {"ro-remount", 1 << REISERFS_ERROR_RO,
727 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
728 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
729 {"continue", 1 << REISERFS_ERROR_CONTINUE,
730 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
731 #endif
732 {NULL, 0, 0},
733 };
734
735 /* proceed only one option from a list *cur - string containing of mount options
736 opts - array of options which are accepted
737 opt_arg - if option is found and requires an argument and if it is specifed
738 in the input - pointer to the argument is stored here
739 bit_flags - if option requires to set a certain bit - it is set here
740 return -1 if unknown option is found, opt->arg_required otherwise */
741 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
742 char **opt_arg, unsigned long *bit_flags)
743 {
744 char *p;
745 /* foo=bar,
746 ^ ^ ^
747 | | +-- option_end
748 | +-- arg_start
749 +-- option_start
750 */
751 const opt_desc_t *opt;
752 const arg_desc_t *arg;
753
754 p = *cur;
755
756 /* assume argument cannot contain commas */
757 *cur = strchr(p, ',');
758 if (*cur) {
759 *(*cur) = '\0';
760 (*cur)++;
761 }
762
763 if (!strncmp(p, "alloc=", 6)) {
764 /* Ugly special case, probably we should redo options parser so that
765 it can understand several arguments for some options, also so that
766 it can fill several bitfields with option values. */
767 if (reiserfs_parse_alloc_options(s, p + 6)) {
768 return -1;
769 } else {
770 return 0;
771 }
772 }
773
774 /* for every option in the list */
775 for (opt = opts; opt->option_name; opt++) {
776 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
777 if (bit_flags) {
778 if (opt->clrmask ==
779 (1 << REISERFS_UNSUPPORTED_OPT))
780 reiserfs_warning(s, "super-6500",
781 "%s not supported.\n",
782 p);
783 else
784 *bit_flags &= ~opt->clrmask;
785 if (opt->setmask ==
786 (1 << REISERFS_UNSUPPORTED_OPT))
787 reiserfs_warning(s, "super-6501",
788 "%s not supported.\n",
789 p);
790 else
791 *bit_flags |= opt->setmask;
792 }
793 break;
794 }
795 }
796 if (!opt->option_name) {
797 reiserfs_warning(s, "super-6502",
798 "unknown mount option \"%s\"", p);
799 return -1;
800 }
801
802 p += strlen(opt->option_name);
803 switch (*p) {
804 case '=':
805 if (!opt->arg_required) {
806 reiserfs_warning(s, "super-6503",
807 "the option \"%s\" does not "
808 "require an argument\n",
809 opt->option_name);
810 return -1;
811 }
812 break;
813
814 case 0:
815 if (opt->arg_required) {
816 reiserfs_warning(s, "super-6504",
817 "the option \"%s\" requires an "
818 "argument\n", opt->option_name);
819 return -1;
820 }
821 break;
822 default:
823 reiserfs_warning(s, "super-6505",
824 "head of option \"%s\" is only correct\n",
825 opt->option_name);
826 return -1;
827 }
828
829 /* move to the argument, or to next option if argument is not required */
830 p++;
831
832 if (opt->arg_required
833 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
834 && !strlen(p)) {
835 /* this catches "option=," if not allowed */
836 reiserfs_warning(s, "super-6506",
837 "empty argument for \"%s\"\n",
838 opt->option_name);
839 return -1;
840 }
841
842 if (!opt->values) {
843 /* *=NULLopt_arg contains pointer to argument */
844 *opt_arg = p;
845 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
846 }
847
848 /* values possible for this option are listed in opt->values */
849 for (arg = opt->values; arg->value; arg++) {
850 if (!strcmp(p, arg->value)) {
851 if (bit_flags) {
852 *bit_flags &= ~arg->clrmask;
853 *bit_flags |= arg->setmask;
854 }
855 return opt->arg_required;
856 }
857 }
858
859 reiserfs_warning(s, "super-6506",
860 "bad value \"%s\" for option \"%s\"\n", p,
861 opt->option_name);
862 return -1;
863 }
864
865 /* returns 0 if something is wrong in option string, 1 - otherwise */
866 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
867 unsigned long *mount_options,
868 /* after the parsing phase, contains the
869 collection of bitflags defining what
870 mount options were selected. */
871 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
872 char **jdev_name,
873 unsigned int *commit_max_age,
874 char **qf_names,
875 unsigned int *qfmt)
876 {
877 int c;
878 char *arg = NULL;
879 char *pos;
880 opt_desc_t opts[] = {
881 /* Compatibility stuff, so that -o notail for old setups still work */
882 {"tails",.arg_required = 't',.values = tails},
883 {"notail",.clrmask =
884 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
885 {"conv",.setmask = 1 << REISERFS_CONVERT},
886 {"attrs",.setmask = 1 << REISERFS_ATTRS},
887 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
888 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
889 #ifdef CONFIG_REISERFS_FS_XATTR
890 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
891 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
892 #else
893 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
894 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
895 #endif
896 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
897 {"acl",.setmask = 1 << REISERFS_POSIXACL},
898 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
899 #else
900 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
901 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
902 #endif
903 {.option_name = "nolog"},
904 {"replayonly",.setmask = 1 << REPLAYONLY},
905 {"block-allocator",.arg_required = 'a',.values = balloc},
906 {"data",.arg_required = 'd',.values = logging_mode},
907 {"barrier",.arg_required = 'b',.values = barrier_mode},
908 {"resize",.arg_required = 'r',.values = NULL},
909 {"jdev",.arg_required = 'j',.values = NULL},
910 {"nolargeio",.arg_required = 'w',.values = NULL},
911 {"commit",.arg_required = 'c',.values = NULL},
912 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
913 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
914 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
915 {"errors",.arg_required = 'e',.values = error_actions},
916 {"usrjquota",.arg_required =
917 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
918 {"grpjquota",.arg_required =
919 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
920 {"jqfmt",.arg_required = 'f',.values = NULL},
921 {.option_name = NULL}
922 };
923
924 *blocks = 0;
925 if (!options || !*options)
926 /* use default configuration: create tails, journaling on, no
927 conversion to newest format */
928 return 1;
929
930 for (pos = options; pos;) {
931 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
932 if (c == -1)
933 /* wrong option is given */
934 return 0;
935
936 if (c == 'r') {
937 char *p;
938
939 p = NULL;
940 /* "resize=NNN" or "resize=auto" */
941
942 if (!strcmp(arg, "auto")) {
943 /* From JFS code, to auto-get the size. */
944 *blocks =
945 s->s_bdev->bd_inode->i_size >> s->
946 s_blocksize_bits;
947 } else {
948 *blocks = simple_strtoul(arg, &p, 0);
949 if (*p != '\0') {
950 /* NNN does not look like a number */
951 reiserfs_warning(s, "super-6507",
952 "bad value %s for "
953 "-oresize\n", arg);
954 return 0;
955 }
956 }
957 }
958
959 if (c == 'c') {
960 char *p = NULL;
961 unsigned long val = simple_strtoul(arg, &p, 0);
962 /* commit=NNN (time in seconds) */
963 if (*p != '\0' || val >= (unsigned int)-1) {
964 reiserfs_warning(s, "super-6508",
965 "bad value %s for -ocommit\n",
966 arg);
967 return 0;
968 }
969 *commit_max_age = (unsigned int)val;
970 }
971
972 if (c == 'w') {
973 reiserfs_warning(s, "super-6509", "nolargeio option "
974 "is no longer supported");
975 return 0;
976 }
977
978 if (c == 'j') {
979 if (arg && *arg && jdev_name) {
980 if (*jdev_name) { //Hm, already assigned?
981 reiserfs_warning(s, "super-6510",
982 "journal device was "
983 "already specified to "
984 "be %s", *jdev_name);
985 return 0;
986 }
987 *jdev_name = arg;
988 }
989 }
990 #ifdef CONFIG_QUOTA
991 if (c == 'u' || c == 'g') {
992 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
993
994 if (sb_any_quota_loaded(s) &&
995 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
996 reiserfs_warning(s, "super-6511",
997 "cannot change journaled "
998 "quota options when quota "
999 "turned on.");
1000 return 0;
1001 }
1002 if (*arg) { /* Some filename specified? */
1003 if (REISERFS_SB(s)->s_qf_names[qtype]
1004 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1005 arg)) {
1006 reiserfs_warning(s, "super-6512",
1007 "%s quota file "
1008 "already specified.",
1009 QTYPE2NAME(qtype));
1010 return 0;
1011 }
1012 if (strchr(arg, '/')) {
1013 reiserfs_warning(s, "super-6513",
1014 "quotafile must be "
1015 "on filesystem root.");
1016 return 0;
1017 }
1018 qf_names[qtype] =
1019 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1020 if (!qf_names[qtype]) {
1021 reiserfs_warning(s, "reiserfs-2502",
1022 "not enough memory "
1023 "for storing "
1024 "quotafile name.");
1025 return 0;
1026 }
1027 strcpy(qf_names[qtype], arg);
1028 *mount_options |= 1 << REISERFS_QUOTA;
1029 } else {
1030 if (qf_names[qtype] !=
1031 REISERFS_SB(s)->s_qf_names[qtype])
1032 kfree(qf_names[qtype]);
1033 qf_names[qtype] = NULL;
1034 }
1035 }
1036 if (c == 'f') {
1037 if (!strcmp(arg, "vfsold"))
1038 *qfmt = QFMT_VFS_OLD;
1039 else if (!strcmp(arg, "vfsv0"))
1040 *qfmt = QFMT_VFS_V0;
1041 else {
1042 reiserfs_warning(s, "super-6514",
1043 "unknown quota format "
1044 "specified.");
1045 return 0;
1046 }
1047 if (sb_any_quota_loaded(s) &&
1048 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1049 reiserfs_warning(s, "super-6515",
1050 "cannot change journaled "
1051 "quota options when quota "
1052 "turned on.");
1053 return 0;
1054 }
1055 }
1056 #else
1057 if (c == 'u' || c == 'g' || c == 'f') {
1058 reiserfs_warning(s, "reiserfs-2503", "journaled "
1059 "quota options not supported.");
1060 return 0;
1061 }
1062 #endif
1063 }
1064
1065 #ifdef CONFIG_QUOTA
1066 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1067 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1068 reiserfs_warning(s, "super-6515",
1069 "journaled quota format not specified.");
1070 return 0;
1071 }
1072 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1073 if (!(*mount_options & (1 << REISERFS_QUOTA))
1074 && sb_any_quota_loaded(s)) {
1075 reiserfs_warning(s, "super-6516", "quota options must "
1076 "be present when quota is turned on.");
1077 return 0;
1078 }
1079 #endif
1080
1081 return 1;
1082 }
1083
1084 static void switch_data_mode(struct super_block *s, unsigned long mode)
1085 {
1086 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1087 (1 << REISERFS_DATA_ORDERED) |
1088 (1 << REISERFS_DATA_WRITEBACK));
1089 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1090 }
1091
1092 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1093 {
1094 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1095 if (!reiserfs_data_log(s)) {
1096 switch_data_mode(s, REISERFS_DATA_LOG);
1097 reiserfs_info(s, "switching to journaled data mode\n");
1098 }
1099 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1100 if (!reiserfs_data_ordered(s)) {
1101 switch_data_mode(s, REISERFS_DATA_ORDERED);
1102 reiserfs_info(s, "switching to ordered data mode\n");
1103 }
1104 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1105 if (!reiserfs_data_writeback(s)) {
1106 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1107 reiserfs_info(s, "switching to writeback data mode\n");
1108 }
1109 }
1110 }
1111
1112 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1113 {
1114 int flush = (1 << REISERFS_BARRIER_FLUSH);
1115 int none = (1 << REISERFS_BARRIER_NONE);
1116 int all_barrier = flush | none;
1117
1118 if (bits & all_barrier) {
1119 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1120 if (bits & flush) {
1121 REISERFS_SB(s)->s_mount_opt |= flush;
1122 printk("reiserfs: enabling write barrier flush mode\n");
1123 } else if (bits & none) {
1124 REISERFS_SB(s)->s_mount_opt |= none;
1125 printk("reiserfs: write barriers turned off\n");
1126 }
1127 }
1128 }
1129
1130 static void handle_attrs(struct super_block *s)
1131 {
1132 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1133
1134 if (reiserfs_attrs(s)) {
1135 if (old_format_only(s)) {
1136 reiserfs_warning(s, "super-6517", "cannot support "
1137 "attributes on 3.5.x disk format");
1138 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1139 return;
1140 }
1141 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1142 reiserfs_warning(s, "super-6518", "cannot support "
1143 "attributes until flag is set in "
1144 "super-block");
1145 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1146 }
1147 }
1148 }
1149
1150 #ifdef CONFIG_QUOTA
1151 static void handle_quota_files(struct super_block *s, char **qf_names,
1152 unsigned int *qfmt)
1153 {
1154 int i;
1155
1156 for (i = 0; i < MAXQUOTAS; i++) {
1157 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1158 kfree(REISERFS_SB(s)->s_qf_names[i]);
1159 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1160 }
1161 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1162 }
1163 #endif
1164
1165 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1166 {
1167 struct reiserfs_super_block *rs;
1168 struct reiserfs_transaction_handle th;
1169 unsigned long blocks;
1170 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1171 unsigned long safe_mask = 0;
1172 unsigned int commit_max_age = (unsigned int)-1;
1173 struct reiserfs_journal *journal = SB_JOURNAL(s);
1174 char *new_opts = kstrdup(arg, GFP_KERNEL);
1175 int err;
1176 char *qf_names[MAXQUOTAS];
1177 unsigned int qfmt = 0;
1178 #ifdef CONFIG_QUOTA
1179 int i;
1180 #endif
1181
1182 reiserfs_write_lock(s);
1183
1184 #ifdef CONFIG_QUOTA
1185 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1186 #endif
1187
1188 rs = SB_DISK_SUPER_BLOCK(s);
1189
1190 if (!reiserfs_parse_options
1191 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1192 qf_names, &qfmt)) {
1193 #ifdef CONFIG_QUOTA
1194 for (i = 0; i < MAXQUOTAS; i++)
1195 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1196 kfree(qf_names[i]);
1197 #endif
1198 err = -EINVAL;
1199 goto out_err;
1200 }
1201 #ifdef CONFIG_QUOTA
1202 handle_quota_files(s, qf_names, &qfmt);
1203 #endif
1204
1205 handle_attrs(s);
1206
1207 /* Add options that are safe here */
1208 safe_mask |= 1 << REISERFS_SMALLTAIL;
1209 safe_mask |= 1 << REISERFS_LARGETAIL;
1210 safe_mask |= 1 << REISERFS_NO_BORDER;
1211 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1212 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1213 safe_mask |= 1 << REISERFS_TEST4;
1214 safe_mask |= 1 << REISERFS_ATTRS;
1215 safe_mask |= 1 << REISERFS_XATTRS_USER;
1216 safe_mask |= 1 << REISERFS_POSIXACL;
1217 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1218 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1219 safe_mask |= 1 << REISERFS_ERROR_RO;
1220 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1221 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1222 safe_mask |= 1 << REISERFS_QUOTA;
1223
1224 /* Update the bitmask, taking care to keep
1225 * the bits we're not allowed to change here */
1226 REISERFS_SB(s)->s_mount_opt =
1227 (REISERFS_SB(s)->
1228 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1229
1230 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1231 journal->j_max_commit_age = commit_max_age;
1232 journal->j_max_trans_age = commit_max_age;
1233 } else if (commit_max_age == 0) {
1234 /* 0 means restore defaults. */
1235 journal->j_max_commit_age = journal->j_default_max_commit_age;
1236 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1237 }
1238
1239 if (blocks) {
1240 err = reiserfs_resize(s, blocks);
1241 if (err != 0)
1242 goto out_err;
1243 }
1244
1245 if (*mount_flags & MS_RDONLY) {
1246 reiserfs_xattr_init(s, *mount_flags);
1247 /* remount read-only */
1248 if (s->s_flags & MS_RDONLY)
1249 /* it is read-only already */
1250 goto out_ok;
1251
1252 err = dquot_suspend(s, -1);
1253 if (err < 0)
1254 goto out_err;
1255
1256 /* try to remount file system with read-only permissions */
1257 if (sb_umount_state(rs) == REISERFS_VALID_FS
1258 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1259 goto out_ok;
1260 }
1261
1262 err = journal_begin(&th, s, 10);
1263 if (err)
1264 goto out_err;
1265
1266 /* Mounting a rw partition read-only. */
1267 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1268 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1269 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1270 } else {
1271 /* remount read-write */
1272 if (!(s->s_flags & MS_RDONLY)) {
1273 reiserfs_xattr_init(s, *mount_flags);
1274 goto out_ok; /* We are read-write already */
1275 }
1276
1277 if (reiserfs_is_journal_aborted(journal)) {
1278 err = journal->j_errno;
1279 goto out_err;
1280 }
1281
1282 handle_data_mode(s, mount_options);
1283 handle_barrier_mode(s, mount_options);
1284 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1285 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1286 err = journal_begin(&th, s, 10);
1287 if (err)
1288 goto out_err;
1289
1290 /* Mount a partition which is read-only, read-write */
1291 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1292 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1293 s->s_flags &= ~MS_RDONLY;
1294 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1295 if (!old_format_only(s))
1296 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1297 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1298 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1299 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1300 }
1301 /* this will force a full flush of all journal lists */
1302 SB_JOURNAL(s)->j_must_wait = 1;
1303 err = journal_end(&th, s, 10);
1304 if (err)
1305 goto out_err;
1306 s->s_dirt = 0;
1307
1308 if (!(*mount_flags & MS_RDONLY)) {
1309 dquot_resume(s, -1);
1310 finish_unfinished(s);
1311 reiserfs_xattr_init(s, *mount_flags);
1312 }
1313
1314 out_ok:
1315 replace_mount_options(s, new_opts);
1316 reiserfs_write_unlock(s);
1317 return 0;
1318
1319 out_err:
1320 kfree(new_opts);
1321 reiserfs_write_unlock(s);
1322 return err;
1323 }
1324
1325 static int read_super_block(struct super_block *s, int offset)
1326 {
1327 struct buffer_head *bh;
1328 struct reiserfs_super_block *rs;
1329 int fs_blocksize;
1330
1331 bh = sb_bread(s, offset / s->s_blocksize);
1332 if (!bh) {
1333 reiserfs_warning(s, "sh-2006",
1334 "bread failed (dev %s, block %lu, size %lu)",
1335 reiserfs_bdevname(s), offset / s->s_blocksize,
1336 s->s_blocksize);
1337 return 1;
1338 }
1339
1340 rs = (struct reiserfs_super_block *)bh->b_data;
1341 if (!is_any_reiserfs_magic_string(rs)) {
1342 brelse(bh);
1343 return 1;
1344 }
1345 //
1346 // ok, reiserfs signature (old or new) found in at the given offset
1347 //
1348 fs_blocksize = sb_blocksize(rs);
1349 brelse(bh);
1350 sb_set_blocksize(s, fs_blocksize);
1351
1352 bh = sb_bread(s, offset / s->s_blocksize);
1353 if (!bh) {
1354 reiserfs_warning(s, "sh-2007",
1355 "bread failed (dev %s, block %lu, size %lu)",
1356 reiserfs_bdevname(s), offset / s->s_blocksize,
1357 s->s_blocksize);
1358 return 1;
1359 }
1360
1361 rs = (struct reiserfs_super_block *)bh->b_data;
1362 if (sb_blocksize(rs) != s->s_blocksize) {
1363 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1364 "filesystem on (dev %s, block %Lu, size %lu)",
1365 reiserfs_bdevname(s),
1366 (unsigned long long)bh->b_blocknr,
1367 s->s_blocksize);
1368 brelse(bh);
1369 return 1;
1370 }
1371
1372 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1373 brelse(bh);
1374 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1375 "--rebuild-tree run detected. Please run\n"
1376 "reiserfsck --rebuild-tree and wait for a "
1377 "completion. If that fails\n"
1378 "get newer reiserfsprogs package");
1379 return 1;
1380 }
1381
1382 SB_BUFFER_WITH_SB(s) = bh;
1383 SB_DISK_SUPER_BLOCK(s) = rs;
1384
1385 if (is_reiserfs_jr(rs)) {
1386 /* magic is of non-standard journal filesystem, look at s_version to
1387 find which format is in use */
1388 if (sb_version(rs) == REISERFS_VERSION_2)
1389 reiserfs_info(s, "found reiserfs format \"3.6\""
1390 " with non-standard journal\n");
1391 else if (sb_version(rs) == REISERFS_VERSION_1)
1392 reiserfs_info(s, "found reiserfs format \"3.5\""
1393 " with non-standard journal\n");
1394 else {
1395 reiserfs_warning(s, "sh-2012", "found unknown "
1396 "format \"%u\" of reiserfs with "
1397 "non-standard magic", sb_version(rs));
1398 return 1;
1399 }
1400 } else
1401 /* s_version of standard format may contain incorrect information,
1402 so we just look at the magic string */
1403 reiserfs_info(s,
1404 "found reiserfs format \"%s\" with standard journal\n",
1405 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1406
1407 s->s_op = &reiserfs_sops;
1408 s->s_export_op = &reiserfs_export_ops;
1409 #ifdef CONFIG_QUOTA
1410 s->s_qcop = &reiserfs_qctl_operations;
1411 s->dq_op = &reiserfs_quota_operations;
1412 #endif
1413
1414 /* new format is limited by the 32 bit wide i_blocks field, want to
1415 ** be one full block below that.
1416 */
1417 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1418 return 0;
1419 }
1420
1421 /* after journal replay, reread all bitmap and super blocks */
1422 static int reread_meta_blocks(struct super_block *s)
1423 {
1424 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1425 reiserfs_write_unlock(s);
1426 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1427 reiserfs_write_lock(s);
1428 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1429 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1430 return 1;
1431 }
1432
1433 return 0;
1434 }
1435
1436 /////////////////////////////////////////////////////
1437 // hash detection stuff
1438
1439 // if root directory is empty - we set default - Yura's - hash and
1440 // warn about it
1441 // FIXME: we look for only one name in a directory. If tea and yura
1442 // bith have the same value - we ask user to send report to the
1443 // mailing list
1444 static __u32 find_hash_out(struct super_block *s)
1445 {
1446 int retval;
1447 struct inode *inode;
1448 struct cpu_key key;
1449 INITIALIZE_PATH(path);
1450 struct reiserfs_dir_entry de;
1451 __u32 hash = DEFAULT_HASH;
1452
1453 inode = s->s_root->d_inode;
1454
1455 do { // Some serious "goto"-hater was there ;)
1456 u32 teahash, r5hash, yurahash;
1457
1458 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1459 retval = search_by_entry_key(s, &key, &path, &de);
1460 if (retval == IO_ERROR) {
1461 pathrelse(&path);
1462 return UNSET_HASH;
1463 }
1464 if (retval == NAME_NOT_FOUND)
1465 de.de_entry_num--;
1466 set_de_name_and_namelen(&de);
1467 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1468 /* allow override in this case */
1469 if (reiserfs_rupasov_hash(s)) {
1470 hash = YURA_HASH;
1471 }
1472 reiserfs_info(s, "FS seems to be empty, autodetect "
1473 "is using the default hash\n");
1474 break;
1475 }
1476 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1477 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1478 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1479 if (((teahash == r5hash)
1480 &&
1481 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1482 == r5hash)) || ((teahash == yurahash)
1483 && (yurahash ==
1484 GET_HASH_VALUE(deh_offset
1485 (&
1486 (de.
1487 de_deh[de.
1488 de_entry_num])))))
1489 || ((r5hash == yurahash)
1490 && (yurahash ==
1491 GET_HASH_VALUE(deh_offset
1492 (&(de.de_deh[de.de_entry_num])))))) {
1493 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1494 "automatically detect hash function. "
1495 "Please mount with -o "
1496 "hash={tea,rupasov,r5}");
1497 hash = UNSET_HASH;
1498 break;
1499 }
1500 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1501 yurahash)
1502 hash = YURA_HASH;
1503 else if (GET_HASH_VALUE
1504 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1505 hash = TEA_HASH;
1506 else if (GET_HASH_VALUE
1507 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1508 hash = R5_HASH;
1509 else {
1510 reiserfs_warning(s, "reiserfs-2506",
1511 "Unrecognised hash function");
1512 hash = UNSET_HASH;
1513 }
1514 } while (0);
1515
1516 pathrelse(&path);
1517 return hash;
1518 }
1519
1520 // finds out which hash names are sorted with
1521 static int what_hash(struct super_block *s)
1522 {
1523 __u32 code;
1524
1525 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1526
1527 /* reiserfs_hash_detect() == true if any of the hash mount options
1528 ** were used. We must check them to make sure the user isn't
1529 ** using a bad hash value
1530 */
1531 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1532 code = find_hash_out(s);
1533
1534 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1535 /* detection has found the hash, and we must check against the
1536 ** mount options
1537 */
1538 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1539 reiserfs_warning(s, "reiserfs-2507",
1540 "Error, %s hash detected, "
1541 "unable to force rupasov hash",
1542 reiserfs_hashname(code));
1543 code = UNSET_HASH;
1544 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1545 reiserfs_warning(s, "reiserfs-2508",
1546 "Error, %s hash detected, "
1547 "unable to force tea hash",
1548 reiserfs_hashname(code));
1549 code = UNSET_HASH;
1550 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1551 reiserfs_warning(s, "reiserfs-2509",
1552 "Error, %s hash detected, "
1553 "unable to force r5 hash",
1554 reiserfs_hashname(code));
1555 code = UNSET_HASH;
1556 }
1557 } else {
1558 /* find_hash_out was not called or could not determine the hash */
1559 if (reiserfs_rupasov_hash(s)) {
1560 code = YURA_HASH;
1561 } else if (reiserfs_tea_hash(s)) {
1562 code = TEA_HASH;
1563 } else if (reiserfs_r5_hash(s)) {
1564 code = R5_HASH;
1565 }
1566 }
1567
1568 /* if we are mounted RW, and we have a new valid hash code, update
1569 ** the super
1570 */
1571 if (code != UNSET_HASH &&
1572 !(s->s_flags & MS_RDONLY) &&
1573 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1574 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1575 }
1576 return code;
1577 }
1578
1579 // return pointer to appropriate function
1580 static hashf_t hash_function(struct super_block *s)
1581 {
1582 switch (what_hash(s)) {
1583 case TEA_HASH:
1584 reiserfs_info(s, "Using tea hash to sort names\n");
1585 return keyed_hash;
1586 case YURA_HASH:
1587 reiserfs_info(s, "Using rupasov hash to sort names\n");
1588 return yura_hash;
1589 case R5_HASH:
1590 reiserfs_info(s, "Using r5 hash to sort names\n");
1591 return r5_hash;
1592 }
1593 return NULL;
1594 }
1595
1596 // this is used to set up correct value for old partitions
1597 static int function2code(hashf_t func)
1598 {
1599 if (func == keyed_hash)
1600 return TEA_HASH;
1601 if (func == yura_hash)
1602 return YURA_HASH;
1603 if (func == r5_hash)
1604 return R5_HASH;
1605
1606 BUG(); // should never happen
1607
1608 return 0;
1609 }
1610
1611 #define SWARN(silent, s, id, ...) \
1612 if (!(silent)) \
1613 reiserfs_warning(s, id, __VA_ARGS__)
1614
1615 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1616 {
1617 struct inode *root_inode;
1618 struct reiserfs_transaction_handle th;
1619 int old_format = 0;
1620 unsigned long blocks;
1621 unsigned int commit_max_age = 0;
1622 int jinit_done = 0;
1623 struct reiserfs_iget_args args;
1624 struct reiserfs_super_block *rs;
1625 char *jdev_name;
1626 struct reiserfs_sb_info *sbi;
1627 int errval = -EINVAL;
1628 char *qf_names[MAXQUOTAS] = {};
1629 unsigned int qfmt = 0;
1630
1631 save_mount_options(s, data);
1632
1633 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1634 if (!sbi)
1635 return -ENOMEM;
1636 s->s_fs_info = sbi;
1637 /* Set default values for options: non-aggressive tails, RO on errors */
1638 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1639 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1640 /* no preallocation minimum, be smart in
1641 reiserfs_file_write instead */
1642 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1643 /* Preallocate by 16 blocks (17-1) at once */
1644 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1645 /* setup default block allocator options */
1646 reiserfs_init_alloc_options(s);
1647
1648 mutex_init(&REISERFS_SB(s)->lock);
1649 REISERFS_SB(s)->lock_depth = -1;
1650
1651 /*
1652 * This function is called with the bkl, which also was the old
1653 * locking used here.
1654 * do_journal_begin() will soon check if we hold the lock (ie: was the
1655 * bkl). This is likely because do_journal_begin() has several another
1656 * callers because at this time, it doesn't seem to be necessary to
1657 * protect against anything.
1658 * Anyway, let's be conservative and lock for now.
1659 */
1660 reiserfs_write_lock(s);
1661
1662 jdev_name = NULL;
1663 if (reiserfs_parse_options
1664 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1665 &commit_max_age, qf_names, &qfmt) == 0) {
1666 goto error;
1667 }
1668 #ifdef CONFIG_QUOTA
1669 handle_quota_files(s, qf_names, &qfmt);
1670 #endif
1671
1672 if (blocks) {
1673 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1674 goto error;
1675 }
1676
1677 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1678 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1679 old_format = 1;
1680 /* try new format (64-th 1k block), which can contain reiserfs super block */
1681 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1682 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1683 reiserfs_bdevname(s));
1684 goto error;
1685 }
1686
1687 rs = SB_DISK_SUPER_BLOCK(s);
1688 /* Let's do basic sanity check to verify that underlying device is not
1689 smaller than the filesystem. If the check fails then abort and scream,
1690 because bad stuff will happen otherwise. */
1691 if (s->s_bdev && s->s_bdev->bd_inode
1692 && i_size_read(s->s_bdev->bd_inode) <
1693 sb_block_count(rs) * sb_blocksize(rs)) {
1694 SWARN(silent, s, "", "Filesystem cannot be "
1695 "mounted because it is bigger than the device");
1696 SWARN(silent, s, "", "You may need to run fsck "
1697 "or increase size of your LVM partition");
1698 SWARN(silent, s, "", "Or may be you forgot to "
1699 "reboot after fdisk when it told you to");
1700 goto error;
1701 }
1702
1703 sbi->s_mount_state = SB_REISERFS_STATE(s);
1704 sbi->s_mount_state = REISERFS_VALID_FS;
1705
1706 if ((errval = reiserfs_init_bitmap_cache(s))) {
1707 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1708 goto error;
1709 }
1710 errval = -EINVAL;
1711 #ifdef CONFIG_REISERFS_CHECK
1712 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1713 SWARN(silent, s, "", "- it is slow mode for debugging.");
1714 #endif
1715
1716 /* make data=ordered the default */
1717 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1718 !reiserfs_data_writeback(s)) {
1719 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1720 }
1721
1722 if (reiserfs_data_log(s)) {
1723 reiserfs_info(s, "using journaled data mode\n");
1724 } else if (reiserfs_data_ordered(s)) {
1725 reiserfs_info(s, "using ordered data mode\n");
1726 } else {
1727 reiserfs_info(s, "using writeback data mode\n");
1728 }
1729 if (reiserfs_barrier_flush(s)) {
1730 printk("reiserfs: using flush barriers\n");
1731 }
1732 // set_device_ro(s->s_dev, 1) ;
1733 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1734 SWARN(silent, s, "sh-2022",
1735 "unable to initialize journal space");
1736 goto error;
1737 } else {
1738 jinit_done = 1; /* once this is set, journal_release must be called
1739 ** if we error out of the mount
1740 */
1741 }
1742 if (reread_meta_blocks(s)) {
1743 SWARN(silent, s, "jmacd-9",
1744 "unable to reread meta blocks after journal init");
1745 goto error;
1746 }
1747
1748 if (replay_only(s))
1749 goto error;
1750
1751 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1752 SWARN(silent, s, "clm-7000",
1753 "Detected readonly device, marking FS readonly");
1754 s->s_flags |= MS_RDONLY;
1755 }
1756 args.objectid = REISERFS_ROOT_OBJECTID;
1757 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1758 root_inode =
1759 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1760 reiserfs_init_locked_inode, (void *)(&args));
1761 if (!root_inode) {
1762 SWARN(silent, s, "jmacd-10", "get root inode failed");
1763 goto error;
1764 }
1765
1766 if (root_inode->i_state & I_NEW) {
1767 reiserfs_read_locked_inode(root_inode, &args);
1768 unlock_new_inode(root_inode);
1769 }
1770
1771 s->s_root = d_alloc_root(root_inode);
1772 if (!s->s_root) {
1773 iput(root_inode);
1774 goto error;
1775 }
1776 // define and initialize hash function
1777 sbi->s_hash_function = hash_function(s);
1778 if (sbi->s_hash_function == NULL) {
1779 dput(s->s_root);
1780 s->s_root = NULL;
1781 goto error;
1782 }
1783
1784 if (is_reiserfs_3_5(rs)
1785 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1786 set_bit(REISERFS_3_5, &(sbi->s_properties));
1787 else if (old_format)
1788 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1789 else
1790 set_bit(REISERFS_3_6, &(sbi->s_properties));
1791
1792 if (!(s->s_flags & MS_RDONLY)) {
1793
1794 errval = journal_begin(&th, s, 1);
1795 if (errval) {
1796 dput(s->s_root);
1797 s->s_root = NULL;
1798 goto error;
1799 }
1800 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1801
1802 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1803 set_sb_fs_state(rs, 0);
1804
1805 /* Clear out s_bmap_nr if it would wrap. We can handle this
1806 * case, but older revisions can't. This will cause the
1807 * file system to fail mount on those older implementations,
1808 * avoiding corruption. -jeffm */
1809 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1810 sb_bmap_nr(rs) != 0) {
1811 reiserfs_warning(s, "super-2030", "This file system "
1812 "claims to use %u bitmap blocks in "
1813 "its super block, but requires %u. "
1814 "Clearing to zero.", sb_bmap_nr(rs),
1815 reiserfs_bmap_count(s));
1816
1817 set_sb_bmap_nr(rs, 0);
1818 }
1819
1820 if (old_format_only(s)) {
1821 /* filesystem of format 3.5 either with standard or non-standard
1822 journal */
1823 if (convert_reiserfs(s)) {
1824 /* and -o conv is given */
1825 if (!silent)
1826 reiserfs_info(s,
1827 "converting 3.5 filesystem to the 3.6 format");
1828
1829 if (is_reiserfs_3_5(rs))
1830 /* put magic string of 3.6 format. 2.2 will not be able to
1831 mount this filesystem anymore */
1832 memcpy(rs->s_v1.s_magic,
1833 reiserfs_3_6_magic_string,
1834 sizeof
1835 (reiserfs_3_6_magic_string));
1836
1837 set_sb_version(rs, REISERFS_VERSION_2);
1838 reiserfs_convert_objectid_map_v1(s);
1839 set_bit(REISERFS_3_6, &(sbi->s_properties));
1840 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1841 } else if (!silent) {
1842 reiserfs_info(s, "using 3.5.x disk format\n");
1843 }
1844 } else
1845 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1846
1847
1848 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1849 errval = journal_end(&th, s, 1);
1850 if (errval) {
1851 dput(s->s_root);
1852 s->s_root = NULL;
1853 goto error;
1854 }
1855
1856 if ((errval = reiserfs_lookup_privroot(s)) ||
1857 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1858 dput(s->s_root);
1859 s->s_root = NULL;
1860 goto error;
1861 }
1862
1863 /* look for files which were to be removed in previous session */
1864 finish_unfinished(s);
1865 } else {
1866 if (old_format_only(s) && !silent) {
1867 reiserfs_info(s, "using 3.5.x disk format\n");
1868 }
1869
1870 if ((errval = reiserfs_lookup_privroot(s)) ||
1871 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1872 dput(s->s_root);
1873 s->s_root = NULL;
1874 goto error;
1875 }
1876 }
1877 // mark hash in super block: it could be unset. overwrite should be ok
1878 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1879
1880 handle_attrs(s);
1881
1882 reiserfs_proc_info_init(s);
1883
1884 init_waitqueue_head(&(sbi->s_wait));
1885 spin_lock_init(&sbi->bitmap_lock);
1886
1887 reiserfs_write_unlock(s);
1888
1889 return (0);
1890
1891 error:
1892 if (jinit_done) { /* kill the commit thread, free journal ram */
1893 journal_release_error(NULL, s);
1894 }
1895
1896 reiserfs_write_unlock(s);
1897
1898 reiserfs_free_bitmap_cache(s);
1899 if (SB_BUFFER_WITH_SB(s))
1900 brelse(SB_BUFFER_WITH_SB(s));
1901 #ifdef CONFIG_QUOTA
1902 {
1903 int j;
1904 for (j = 0; j < MAXQUOTAS; j++)
1905 kfree(qf_names[j]);
1906 }
1907 #endif
1908 kfree(sbi);
1909
1910 s->s_fs_info = NULL;
1911 return errval;
1912 }
1913
1914 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1915 {
1916 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1917
1918 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1919 buf->f_bfree = sb_free_blocks(rs);
1920 buf->f_bavail = buf->f_bfree;
1921 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1922 buf->f_bsize = dentry->d_sb->s_blocksize;
1923 /* changed to accommodate gcc folks. */
1924 buf->f_type = REISERFS_SUPER_MAGIC;
1925 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1926 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1927 sizeof(rs->s_uuid)/2);
1928
1929 return 0;
1930 }
1931
1932 #ifdef CONFIG_QUOTA
1933 static int reiserfs_write_dquot(struct dquot *dquot)
1934 {
1935 struct reiserfs_transaction_handle th;
1936 int ret, err;
1937
1938 reiserfs_write_lock(dquot->dq_sb);
1939 ret =
1940 journal_begin(&th, dquot->dq_sb,
1941 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1942 if (ret)
1943 goto out;
1944 ret = dquot_commit(dquot);
1945 err =
1946 journal_end(&th, dquot->dq_sb,
1947 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1948 if (!ret && err)
1949 ret = err;
1950 out:
1951 reiserfs_write_unlock(dquot->dq_sb);
1952 return ret;
1953 }
1954
1955 static int reiserfs_acquire_dquot(struct dquot *dquot)
1956 {
1957 struct reiserfs_transaction_handle th;
1958 int ret, err;
1959
1960 reiserfs_write_lock(dquot->dq_sb);
1961 ret =
1962 journal_begin(&th, dquot->dq_sb,
1963 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1964 if (ret)
1965 goto out;
1966 ret = dquot_acquire(dquot);
1967 err =
1968 journal_end(&th, dquot->dq_sb,
1969 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1970 if (!ret && err)
1971 ret = err;
1972 out:
1973 reiserfs_write_unlock(dquot->dq_sb);
1974 return ret;
1975 }
1976
1977 static int reiserfs_release_dquot(struct dquot *dquot)
1978 {
1979 struct reiserfs_transaction_handle th;
1980 int ret, err;
1981
1982 reiserfs_write_lock(dquot->dq_sb);
1983 ret =
1984 journal_begin(&th, dquot->dq_sb,
1985 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1986 if (ret) {
1987 /* Release dquot anyway to avoid endless cycle in dqput() */
1988 dquot_release(dquot);
1989 goto out;
1990 }
1991 ret = dquot_release(dquot);
1992 err =
1993 journal_end(&th, dquot->dq_sb,
1994 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1995 if (!ret && err)
1996 ret = err;
1997 out:
1998 reiserfs_write_unlock(dquot->dq_sb);
1999 return ret;
2000 }
2001
2002 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2003 {
2004 /* Are we journaling quotas? */
2005 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2006 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2007 dquot_mark_dquot_dirty(dquot);
2008 return reiserfs_write_dquot(dquot);
2009 } else
2010 return dquot_mark_dquot_dirty(dquot);
2011 }
2012
2013 static int reiserfs_write_info(struct super_block *sb, int type)
2014 {
2015 struct reiserfs_transaction_handle th;
2016 int ret, err;
2017
2018 /* Data block + inode block */
2019 reiserfs_write_lock(sb);
2020 ret = journal_begin(&th, sb, 2);
2021 if (ret)
2022 goto out;
2023 ret = dquot_commit_info(sb, type);
2024 err = journal_end(&th, sb, 2);
2025 if (!ret && err)
2026 ret = err;
2027 out:
2028 reiserfs_write_unlock(sb);
2029 return ret;
2030 }
2031
2032 /*
2033 * Turn on quotas during mount time - we need to find the quota file and such...
2034 */
2035 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2036 {
2037 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2038 REISERFS_SB(sb)->s_jquota_fmt, type);
2039 }
2040
2041 /*
2042 * Standard function to be called on quota_on
2043 */
2044 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2045 char *name)
2046 {
2047 int err;
2048 struct path path;
2049 struct inode *inode;
2050 struct reiserfs_transaction_handle th;
2051
2052 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2053 return -EINVAL;
2054
2055 err = kern_path(name, LOOKUP_FOLLOW, &path);
2056 if (err)
2057 return err;
2058 /* Quotafile not on the same filesystem? */
2059 if (path.mnt->mnt_sb != sb) {
2060 err = -EXDEV;
2061 goto out;
2062 }
2063 inode = path.dentry->d_inode;
2064 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2065 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2066 err = reiserfs_unpack(inode, NULL);
2067 if (err) {
2068 reiserfs_warning(sb, "super-6520",
2069 "Unpacking tail of quota file failed"
2070 " (%d). Cannot turn on quotas.", err);
2071 err = -EINVAL;
2072 goto out;
2073 }
2074 mark_inode_dirty(inode);
2075 }
2076 /* Journaling quota? */
2077 if (REISERFS_SB(sb)->s_qf_names[type]) {
2078 /* Quotafile not of fs root? */
2079 if (path.dentry->d_parent != sb->s_root)
2080 reiserfs_warning(sb, "super-6521",
2081 "Quota file not on filesystem root. "
2082 "Journalled quota will not work.");
2083 }
2084
2085 /*
2086 * When we journal data on quota file, we have to flush journal to see
2087 * all updates to the file when we bypass pagecache...
2088 */
2089 if (reiserfs_file_data_log(inode)) {
2090 /* Just start temporary transaction and finish it */
2091 err = journal_begin(&th, sb, 1);
2092 if (err)
2093 goto out;
2094 err = journal_end_sync(&th, sb, 1);
2095 if (err)
2096 goto out;
2097 }
2098 err = dquot_quota_on_path(sb, type, format_id, &path);
2099 out:
2100 path_put(&path);
2101 return err;
2102 }
2103
2104 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2105 * acquiring the locks... As quota files are never truncated and quota code
2106 * itself serializes the operations (and noone else should touch the files)
2107 * we don't have to be afraid of races */
2108 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2109 size_t len, loff_t off)
2110 {
2111 struct inode *inode = sb_dqopt(sb)->files[type];
2112 unsigned long blk = off >> sb->s_blocksize_bits;
2113 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2114 size_t toread;
2115 struct buffer_head tmp_bh, *bh;
2116 loff_t i_size = i_size_read(inode);
2117
2118 if (off > i_size)
2119 return 0;
2120 if (off + len > i_size)
2121 len = i_size - off;
2122 toread = len;
2123 while (toread > 0) {
2124 tocopy =
2125 sb->s_blocksize - offset <
2126 toread ? sb->s_blocksize - offset : toread;
2127 tmp_bh.b_state = 0;
2128 /* Quota files are without tails so we can safely use this function */
2129 reiserfs_write_lock(sb);
2130 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2131 reiserfs_write_unlock(sb);
2132 if (err)
2133 return err;
2134 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2135 memset(data, 0, tocopy);
2136 else {
2137 bh = sb_bread(sb, tmp_bh.b_blocknr);
2138 if (!bh)
2139 return -EIO;
2140 memcpy(data, bh->b_data + offset, tocopy);
2141 brelse(bh);
2142 }
2143 offset = 0;
2144 toread -= tocopy;
2145 data += tocopy;
2146 blk++;
2147 }
2148 return len;
2149 }
2150
2151 /* Write to quotafile (we know the transaction is already started and has
2152 * enough credits) */
2153 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2154 const char *data, size_t len, loff_t off)
2155 {
2156 struct inode *inode = sb_dqopt(sb)->files[type];
2157 unsigned long blk = off >> sb->s_blocksize_bits;
2158 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2159 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2160 size_t towrite = len;
2161 struct buffer_head tmp_bh, *bh;
2162
2163 if (!current->journal_info) {
2164 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2165 " cancelled because transaction is not started.\n",
2166 (unsigned long long)off, (unsigned long long)len);
2167 return -EIO;
2168 }
2169 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2170 while (towrite > 0) {
2171 tocopy = sb->s_blocksize - offset < towrite ?
2172 sb->s_blocksize - offset : towrite;
2173 tmp_bh.b_state = 0;
2174 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2175 if (err)
2176 goto out;
2177 if (offset || tocopy != sb->s_blocksize)
2178 bh = sb_bread(sb, tmp_bh.b_blocknr);
2179 else
2180 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2181 if (!bh) {
2182 err = -EIO;
2183 goto out;
2184 }
2185 lock_buffer(bh);
2186 memcpy(bh->b_data + offset, data, tocopy);
2187 flush_dcache_page(bh->b_page);
2188 set_buffer_uptodate(bh);
2189 unlock_buffer(bh);
2190 reiserfs_prepare_for_journal(sb, bh, 1);
2191 journal_mark_dirty(current->journal_info, sb, bh);
2192 if (!journal_quota)
2193 reiserfs_add_ordered_list(inode, bh);
2194 brelse(bh);
2195 offset = 0;
2196 towrite -= tocopy;
2197 data += tocopy;
2198 blk++;
2199 }
2200 out:
2201 if (len == towrite) {
2202 mutex_unlock(&inode->i_mutex);
2203 return err;
2204 }
2205 if (inode->i_size < off + len - towrite)
2206 i_size_write(inode, off + len - towrite);
2207 inode->i_version++;
2208 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2209 mark_inode_dirty(inode);
2210 mutex_unlock(&inode->i_mutex);
2211 return len - towrite;
2212 }
2213
2214 #endif
2215
2216 static int get_super_block(struct file_system_type *fs_type,
2217 int flags, const char *dev_name,
2218 void *data, struct vfsmount *mnt)
2219 {
2220 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2221 mnt);
2222 }
2223
2224 static int __init init_reiserfs_fs(void)
2225 {
2226 int ret;
2227
2228 if ((ret = init_inodecache())) {
2229 return ret;
2230 }
2231
2232 reiserfs_proc_info_global_init();
2233
2234 ret = register_filesystem(&reiserfs_fs_type);
2235
2236 if (ret == 0) {
2237 return 0;
2238 }
2239
2240 reiserfs_proc_info_global_done();
2241 destroy_inodecache();
2242
2243 return ret;
2244 }
2245
2246 static void __exit exit_reiserfs_fs(void)
2247 {
2248 reiserfs_proc_info_global_done();
2249 unregister_filesystem(&reiserfs_fs_type);
2250 destroy_inodecache();
2251 }
2252
2253 struct file_system_type reiserfs_fs_type = {
2254 .owner = THIS_MODULE,
2255 .name = "reiserfs",
2256 .get_sb = get_super_block,
2257 .kill_sb = reiserfs_kill_sb,
2258 .fs_flags = FS_REQUIRES_DEV,
2259 };
2260
2261 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2262 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2263 MODULE_LICENSE("GPL");
2264
2265 module_init(init_reiserfs_fs);
2266 module_exit(exit_reiserfs_fs);
CJK support for tty framebuffer vt