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 <linux/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/backing-dev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/exportfs.h>
27 #include <linux/quotaops.h>
28 #include <linux/vfs.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/crc32.h>
32 #include <linux/seq_file.h>
33
34 struct file_system_type reiserfs_fs_type;
35
36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
is_reiserfs_3_5(struct reiserfs_super_block * rs)40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 {
42 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
43 strlen(reiserfs_3_5_magic_string));
44 }
45
is_reiserfs_3_6(struct reiserfs_super_block * rs)46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 {
48 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
49 strlen(reiserfs_3_6_magic_string));
50 }
51
is_reiserfs_jr(struct reiserfs_super_block * rs)52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 {
54 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
55 strlen(reiserfs_jr_magic_string));
56 }
57
is_any_reiserfs_magic_string(struct reiserfs_super_block * rs)58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 {
60 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
61 is_reiserfs_jr(rs));
62 }
63
64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66
reiserfs_sync_fs(struct super_block * s,int wait)67 static int reiserfs_sync_fs(struct super_block *s, int wait)
68 {
69 struct reiserfs_transaction_handle th;
70
71 /*
72 * Writeback quota in non-journalled quota case - journalled quota has
73 * no dirty dquots
74 */
75 dquot_writeback_dquots(s, -1);
76 reiserfs_write_lock(s);
77 if (!journal_begin(&th, s, 1))
78 if (!journal_end_sync(&th))
79 reiserfs_flush_old_commits(s);
80 reiserfs_write_unlock(s);
81 return 0;
82 }
83
flush_old_commits(struct work_struct * work)84 static void flush_old_commits(struct work_struct *work)
85 {
86 struct reiserfs_sb_info *sbi;
87 struct super_block *s;
88
89 sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
90 s = sbi->s_journal->j_work_sb;
91
92 spin_lock(&sbi->old_work_lock);
93 /* Avoid clobbering the cancel state... */
94 if (sbi->work_queued == 1)
95 sbi->work_queued = 0;
96 spin_unlock(&sbi->old_work_lock);
97
98 reiserfs_sync_fs(s, 1);
99 }
100
reiserfs_schedule_old_flush(struct super_block * s)101 void reiserfs_schedule_old_flush(struct super_block *s)
102 {
103 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
104 unsigned long delay;
105
106 /*
107 * Avoid scheduling flush when sb is being shut down. It can race
108 * with journal shutdown and free still queued delayed work.
109 */
110 if (s->s_flags & MS_RDONLY || !(s->s_flags & MS_ACTIVE))
111 return;
112
113 spin_lock(&sbi->old_work_lock);
114 if (!sbi->work_queued) {
115 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
116 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
117 sbi->work_queued = 1;
118 }
119 spin_unlock(&sbi->old_work_lock);
120 }
121
reiserfs_cancel_old_flush(struct super_block * s)122 void reiserfs_cancel_old_flush(struct super_block *s)
123 {
124 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
125
126 spin_lock(&sbi->old_work_lock);
127 /* Make sure no new flushes will be queued */
128 sbi->work_queued = 2;
129 spin_unlock(&sbi->old_work_lock);
130 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
131 }
132
reiserfs_freeze(struct super_block * s)133 static int reiserfs_freeze(struct super_block *s)
134 {
135 struct reiserfs_transaction_handle th;
136
137 reiserfs_cancel_old_flush(s);
138
139 reiserfs_write_lock(s);
140 if (!(s->s_flags & MS_RDONLY)) {
141 int err = journal_begin(&th, s, 1);
142 if (err) {
143 reiserfs_block_writes(&th);
144 } else {
145 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
146 1);
147 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
148 reiserfs_block_writes(&th);
149 journal_end_sync(&th);
150 }
151 }
152 reiserfs_write_unlock(s);
153 return 0;
154 }
155
reiserfs_unfreeze(struct super_block * s)156 static int reiserfs_unfreeze(struct super_block *s)
157 {
158 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
159
160 reiserfs_allow_writes(s);
161 spin_lock(&sbi->old_work_lock);
162 /* Allow old_work to run again */
163 sbi->work_queued = 0;
164 spin_unlock(&sbi->old_work_lock);
165 return 0;
166 }
167
168 extern const struct in_core_key MAX_IN_CORE_KEY;
169
170 /*
171 * this is used to delete "save link" when there are no items of a
172 * file it points to. It can either happen if unlink is completed but
173 * "save unlink" removal, or if file has both unlink and truncate
174 * pending and as unlink completes first (because key of "save link"
175 * protecting unlink is bigger that a key lf "save link" which
176 * protects truncate), so there left no items to make truncate
177 * completion on
178 */
remove_save_link_only(struct super_block * s,struct reiserfs_key * key,int oid_free)179 static int remove_save_link_only(struct super_block *s,
180 struct reiserfs_key *key, int oid_free)
181 {
182 struct reiserfs_transaction_handle th;
183 int err;
184
185 /* we are going to do one balancing */
186 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
187 if (err)
188 return err;
189
190 reiserfs_delete_solid_item(&th, NULL, key);
191 if (oid_free)
192 /* removals are protected by direct items */
193 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
194
195 return journal_end(&th);
196 }
197
198 #ifdef CONFIG_QUOTA
199 static int reiserfs_quota_on_mount(struct super_block *, int);
200 #endif
201
202 /*
203 * Look for uncompleted unlinks and truncates and complete them
204 *
205 * Called with superblock write locked. If quotas are enabled, we have to
206 * release/retake lest we call dquot_quota_on_mount(), proceed to
207 * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
208 * cpu worklets to complete flush_async_commits() that in turn wait for the
209 * superblock write lock.
210 */
finish_unfinished(struct super_block * s)211 static int finish_unfinished(struct super_block *s)
212 {
213 INITIALIZE_PATH(path);
214 struct cpu_key max_cpu_key, obj_key;
215 struct reiserfs_key save_link_key, last_inode_key;
216 int retval = 0;
217 struct item_head *ih;
218 struct buffer_head *bh;
219 int item_pos;
220 char *item;
221 int done;
222 struct inode *inode;
223 int truncate;
224 #ifdef CONFIG_QUOTA
225 int i;
226 int ms_active_set;
227 int quota_enabled[REISERFS_MAXQUOTAS];
228 #endif
229
230 /* compose key to look for "save" links */
231 max_cpu_key.version = KEY_FORMAT_3_5;
232 max_cpu_key.on_disk_key.k_dir_id = ~0U;
233 max_cpu_key.on_disk_key.k_objectid = ~0U;
234 set_cpu_key_k_offset(&max_cpu_key, ~0U);
235 max_cpu_key.key_length = 3;
236
237 memset(&last_inode_key, 0, sizeof(last_inode_key));
238
239 #ifdef CONFIG_QUOTA
240 /* Needed for iput() to work correctly and not trash data */
241 if (s->s_flags & MS_ACTIVE) {
242 ms_active_set = 0;
243 } else {
244 ms_active_set = 1;
245 s->s_flags |= MS_ACTIVE;
246 }
247 /* Turn on quotas so that they are updated correctly */
248 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
249 quota_enabled[i] = 1;
250 if (REISERFS_SB(s)->s_qf_names[i]) {
251 int ret;
252
253 if (sb_has_quota_active(s, i)) {
254 quota_enabled[i] = 0;
255 continue;
256 }
257 reiserfs_write_unlock(s);
258 ret = reiserfs_quota_on_mount(s, i);
259 reiserfs_write_lock(s);
260 if (ret < 0)
261 reiserfs_warning(s, "reiserfs-2500",
262 "cannot turn on journaled "
263 "quota: error %d", ret);
264 }
265 }
266 #endif
267
268 done = 0;
269 REISERFS_SB(s)->s_is_unlinked_ok = 1;
270 while (!retval) {
271 int depth;
272 retval = search_item(s, &max_cpu_key, &path);
273 if (retval != ITEM_NOT_FOUND) {
274 reiserfs_error(s, "vs-2140",
275 "search_by_key returned %d", retval);
276 break;
277 }
278
279 bh = get_last_bh(&path);
280 item_pos = get_item_pos(&path);
281 if (item_pos != B_NR_ITEMS(bh)) {
282 reiserfs_warning(s, "vs-2060",
283 "wrong position found");
284 break;
285 }
286 item_pos--;
287 ih = item_head(bh, item_pos);
288
289 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
290 /* there are no "save" links anymore */
291 break;
292
293 save_link_key = ih->ih_key;
294 if (is_indirect_le_ih(ih))
295 truncate = 1;
296 else
297 truncate = 0;
298
299 /* reiserfs_iget needs k_dirid and k_objectid only */
300 item = ih_item_body(bh, ih);
301 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
302 obj_key.on_disk_key.k_objectid =
303 le32_to_cpu(ih->ih_key.k_objectid);
304 obj_key.on_disk_key.k_offset = 0;
305 obj_key.on_disk_key.k_type = 0;
306
307 pathrelse(&path);
308
309 inode = reiserfs_iget(s, &obj_key);
310 if (IS_ERR_OR_NULL(inode)) {
311 /*
312 * the unlink almost completed, it just did not
313 * manage to remove "save" link and release objectid
314 */
315 reiserfs_warning(s, "vs-2180", "iget failed for %K",
316 &obj_key);
317 retval = remove_save_link_only(s, &save_link_key, 1);
318 continue;
319 }
320
321 if (!truncate && inode->i_nlink) {
322 /* file is not unlinked */
323 reiserfs_warning(s, "vs-2185",
324 "file %K is not unlinked",
325 &obj_key);
326 retval = remove_save_link_only(s, &save_link_key, 0);
327 continue;
328 }
329 depth = reiserfs_write_unlock_nested(inode->i_sb);
330 dquot_initialize(inode);
331 reiserfs_write_lock_nested(inode->i_sb, depth);
332
333 if (truncate && S_ISDIR(inode->i_mode)) {
334 /*
335 * We got a truncate request for a dir which
336 * is impossible. The only imaginable way is to
337 * execute unfinished truncate request then boot
338 * into old kernel, remove the file and create dir
339 * with the same key.
340 */
341 reiserfs_warning(s, "green-2101",
342 "impossible truncate on a "
343 "directory %k. Please report",
344 INODE_PKEY(inode));
345 retval = remove_save_link_only(s, &save_link_key, 0);
346 truncate = 0;
347 iput(inode);
348 continue;
349 }
350
351 if (truncate) {
352 REISERFS_I(inode)->i_flags |=
353 i_link_saved_truncate_mask;
354 /*
355 * not completed truncate found. New size was
356 * committed together with "save" link
357 */
358 reiserfs_info(s, "Truncating %k to %lld ..",
359 INODE_PKEY(inode), inode->i_size);
360
361 /* don't update modification time */
362 reiserfs_truncate_file(inode, 0);
363
364 retval = remove_save_link(inode, truncate);
365 } else {
366 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
367 /* not completed unlink (rmdir) found */
368 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
369 if (memcmp(&last_inode_key, INODE_PKEY(inode),
370 sizeof(last_inode_key))){
371 last_inode_key = *INODE_PKEY(inode);
372 /* removal gets completed in iput */
373 retval = 0;
374 } else {
375 reiserfs_warning(s, "super-2189", "Dead loop "
376 "in finish_unfinished "
377 "detected, just remove "
378 "save link\n");
379 retval = remove_save_link_only(s,
380 &save_link_key, 0);
381 }
382 }
383
384 iput(inode);
385 printk("done\n");
386 done++;
387 }
388 REISERFS_SB(s)->s_is_unlinked_ok = 0;
389
390 #ifdef CONFIG_QUOTA
391 /* Turn quotas off */
392 reiserfs_write_unlock(s);
393 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
394 if (sb_dqopt(s)->files[i] && quota_enabled[i])
395 dquot_quota_off(s, i);
396 }
397 reiserfs_write_lock(s);
398 if (ms_active_set)
399 /* Restore the flag back */
400 s->s_flags &= ~MS_ACTIVE;
401 #endif
402 pathrelse(&path);
403 if (done)
404 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
405 "Completed\n", done);
406 return retval;
407 }
408
409 /*
410 * to protect file being unlinked from getting lost we "safe" link files
411 * being unlinked. This link will be deleted in the same transaction with last
412 * item of file. mounting the filesystem we scan all these links and remove
413 * files which almost got lost
414 */
add_save_link(struct reiserfs_transaction_handle * th,struct inode * inode,int truncate)415 void add_save_link(struct reiserfs_transaction_handle *th,
416 struct inode *inode, int truncate)
417 {
418 INITIALIZE_PATH(path);
419 int retval;
420 struct cpu_key key;
421 struct item_head ih;
422 __le32 link;
423
424 BUG_ON(!th->t_trans_id);
425
426 /* file can only get one "save link" of each kind */
427 RFALSE(truncate &&
428 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
429 "saved link already exists for truncated inode %lx",
430 (long)inode->i_ino);
431 RFALSE(!truncate &&
432 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
433 "saved link already exists for unlinked inode %lx",
434 (long)inode->i_ino);
435
436 /* setup key of "save" link */
437 key.version = KEY_FORMAT_3_5;
438 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
439 key.on_disk_key.k_objectid = inode->i_ino;
440 if (!truncate) {
441 /* unlink, rmdir, rename */
442 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
443 set_cpu_key_k_type(&key, TYPE_DIRECT);
444
445 /* item head of "safe" link */
446 make_le_item_head(&ih, &key, key.version,
447 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
448 4 /*length */ , 0xffff /*free space */ );
449 } else {
450 /* truncate */
451 if (S_ISDIR(inode->i_mode))
452 reiserfs_warning(inode->i_sb, "green-2102",
453 "Adding a truncate savelink for "
454 "a directory %k! Please report",
455 INODE_PKEY(inode));
456 set_cpu_key_k_offset(&key, 1);
457 set_cpu_key_k_type(&key, TYPE_INDIRECT);
458
459 /* item head of "safe" link */
460 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
461 4 /*length */ , 0 /*free space */ );
462 }
463 key.key_length = 3;
464
465 /* look for its place in the tree */
466 retval = search_item(inode->i_sb, &key, &path);
467 if (retval != ITEM_NOT_FOUND) {
468 if (retval != -ENOSPC)
469 reiserfs_error(inode->i_sb, "vs-2100",
470 "search_by_key (%K) returned %d", &key,
471 retval);
472 pathrelse(&path);
473 return;
474 }
475
476 /* body of "save" link */
477 link = INODE_PKEY(inode)->k_dir_id;
478
479 /* put "save" link into tree, don't charge quota to anyone */
480 retval =
481 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
482 if (retval) {
483 if (retval != -ENOSPC)
484 reiserfs_error(inode->i_sb, "vs-2120",
485 "insert_item returned %d", retval);
486 } else {
487 if (truncate)
488 REISERFS_I(inode)->i_flags |=
489 i_link_saved_truncate_mask;
490 else
491 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
492 }
493 }
494
495 /* this opens transaction unlike add_save_link */
remove_save_link(struct inode * inode,int truncate)496 int remove_save_link(struct inode *inode, int truncate)
497 {
498 struct reiserfs_transaction_handle th;
499 struct reiserfs_key key;
500 int err;
501
502 /* we are going to do one balancing only */
503 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
504 if (err)
505 return err;
506
507 /* setup key of "save" link */
508 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
509 key.k_objectid = INODE_PKEY(inode)->k_objectid;
510 if (!truncate) {
511 /* unlink, rmdir, rename */
512 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
513 1 + inode->i_sb->s_blocksize);
514 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
515 } else {
516 /* truncate */
517 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
518 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
519 }
520
521 if ((truncate &&
522 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
523 (!truncate &&
524 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
525 /* don't take quota bytes from anywhere */
526 reiserfs_delete_solid_item(&th, NULL, &key);
527 if (!truncate) {
528 reiserfs_release_objectid(&th, inode->i_ino);
529 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
530 } else
531 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
532
533 return journal_end(&th);
534 }
535
reiserfs_kill_sb(struct super_block * s)536 static void reiserfs_kill_sb(struct super_block *s)
537 {
538 if (REISERFS_SB(s)) {
539 reiserfs_proc_info_done(s);
540 /*
541 * Force any pending inode evictions to occur now. Any
542 * inodes to be removed that have extended attributes
543 * associated with them need to clean them up before
544 * we can release the extended attribute root dentries.
545 * shrink_dcache_for_umount will BUG if we don't release
546 * those before it's called so ->put_super is too late.
547 */
548 shrink_dcache_sb(s);
549
550 dput(REISERFS_SB(s)->xattr_root);
551 REISERFS_SB(s)->xattr_root = NULL;
552 dput(REISERFS_SB(s)->priv_root);
553 REISERFS_SB(s)->priv_root = NULL;
554 }
555
556 kill_block_super(s);
557 }
558
reiserfs_put_super(struct super_block * s)559 static void reiserfs_put_super(struct super_block *s)
560 {
561 struct reiserfs_transaction_handle th;
562 th.t_trans_id = 0;
563
564 dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
565
566 reiserfs_write_lock(s);
567
568 /*
569 * change file system state to current state if it was mounted
570 * with read-write permissions
571 */
572 if (!(s->s_flags & MS_RDONLY)) {
573 if (!journal_begin(&th, s, 10)) {
574 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
575 1);
576 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
577 REISERFS_SB(s)->s_mount_state);
578 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
579 }
580 }
581
582 /*
583 * note, journal_release checks for readonly mount, and can
584 * decide not to do a journal_end
585 */
586 journal_release(&th, s);
587
588 reiserfs_free_bitmap_cache(s);
589
590 brelse(SB_BUFFER_WITH_SB(s));
591
592 print_statistics(s);
593
594 if (REISERFS_SB(s)->reserved_blocks != 0) {
595 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
596 REISERFS_SB(s)->reserved_blocks);
597 }
598
599 reiserfs_write_unlock(s);
600 mutex_destroy(&REISERFS_SB(s)->lock);
601 destroy_workqueue(REISERFS_SB(s)->commit_wq);
602 kfree(s->s_fs_info);
603 s->s_fs_info = NULL;
604 }
605
606 static struct kmem_cache *reiserfs_inode_cachep;
607
reiserfs_alloc_inode(struct super_block * sb)608 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
609 {
610 struct reiserfs_inode_info *ei;
611 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
612 if (!ei)
613 return NULL;
614 atomic_set(&ei->openers, 0);
615 mutex_init(&ei->tailpack);
616 #ifdef CONFIG_QUOTA
617 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
618 #endif
619
620 return &ei->vfs_inode;
621 }
622
reiserfs_i_callback(struct rcu_head * head)623 static void reiserfs_i_callback(struct rcu_head *head)
624 {
625 struct inode *inode = container_of(head, struct inode, i_rcu);
626 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
627 }
628
reiserfs_destroy_inode(struct inode * inode)629 static void reiserfs_destroy_inode(struct inode *inode)
630 {
631 call_rcu(&inode->i_rcu, reiserfs_i_callback);
632 }
633
init_once(void * foo)634 static void init_once(void *foo)
635 {
636 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
637
638 INIT_LIST_HEAD(&ei->i_prealloc_list);
639 inode_init_once(&ei->vfs_inode);
640 }
641
init_inodecache(void)642 static int __init init_inodecache(void)
643 {
644 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
645 sizeof(struct
646 reiserfs_inode_info),
647 0, (SLAB_RECLAIM_ACCOUNT|
648 SLAB_MEM_SPREAD|
649 SLAB_ACCOUNT),
650 init_once);
651 if (reiserfs_inode_cachep == NULL)
652 return -ENOMEM;
653 return 0;
654 }
655
destroy_inodecache(void)656 static void destroy_inodecache(void)
657 {
658 /*
659 * Make sure all delayed rcu free inodes are flushed before we
660 * destroy cache.
661 */
662 rcu_barrier();
663 kmem_cache_destroy(reiserfs_inode_cachep);
664 }
665
666 /* we don't mark inodes dirty, we just log them */
reiserfs_dirty_inode(struct inode * inode,int flags)667 static void reiserfs_dirty_inode(struct inode *inode, int flags)
668 {
669 struct reiserfs_transaction_handle th;
670
671 int err = 0;
672
673 if (inode->i_sb->s_flags & MS_RDONLY) {
674 reiserfs_warning(inode->i_sb, "clm-6006",
675 "writing inode %lu on readonly FS",
676 inode->i_ino);
677 return;
678 }
679 reiserfs_write_lock(inode->i_sb);
680
681 /*
682 * this is really only used for atime updates, so they don't have
683 * to be included in O_SYNC or fsync
684 */
685 err = journal_begin(&th, inode->i_sb, 1);
686 if (err)
687 goto out;
688
689 reiserfs_update_sd(&th, inode);
690 journal_end(&th);
691
692 out:
693 reiserfs_write_unlock(inode->i_sb);
694 }
695
reiserfs_show_options(struct seq_file * seq,struct dentry * root)696 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
697 {
698 struct super_block *s = root->d_sb;
699 struct reiserfs_journal *journal = SB_JOURNAL(s);
700 long opts = REISERFS_SB(s)->s_mount_opt;
701
702 if (opts & (1 << REISERFS_LARGETAIL))
703 seq_puts(seq, ",tails=on");
704 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
705 seq_puts(seq, ",notail");
706 /* tails=small is default so we don't show it */
707
708 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
709 seq_puts(seq, ",barrier=none");
710 /* barrier=flush is default so we don't show it */
711
712 if (opts & (1 << REISERFS_ERROR_CONTINUE))
713 seq_puts(seq, ",errors=continue");
714 else if (opts & (1 << REISERFS_ERROR_PANIC))
715 seq_puts(seq, ",errors=panic");
716 /* errors=ro is default so we don't show it */
717
718 if (opts & (1 << REISERFS_DATA_LOG))
719 seq_puts(seq, ",data=journal");
720 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
721 seq_puts(seq, ",data=writeback");
722 /* data=ordered is default so we don't show it */
723
724 if (opts & (1 << REISERFS_ATTRS))
725 seq_puts(seq, ",attrs");
726
727 if (opts & (1 << REISERFS_XATTRS_USER))
728 seq_puts(seq, ",user_xattr");
729
730 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
731 seq_puts(seq, ",expose_privroot");
732
733 if (opts & (1 << REISERFS_POSIXACL))
734 seq_puts(seq, ",acl");
735
736 if (REISERFS_SB(s)->s_jdev)
737 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
738
739 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
740 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
741
742 #ifdef CONFIG_QUOTA
743 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
744 seq_show_option(seq, "usrjquota",
745 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
746 else if (opts & (1 << REISERFS_USRQUOTA))
747 seq_puts(seq, ",usrquota");
748 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
749 seq_show_option(seq, "grpjquota",
750 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
751 else if (opts & (1 << REISERFS_GRPQUOTA))
752 seq_puts(seq, ",grpquota");
753 if (REISERFS_SB(s)->s_jquota_fmt) {
754 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
755 seq_puts(seq, ",jqfmt=vfsold");
756 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
757 seq_puts(seq, ",jqfmt=vfsv0");
758 }
759 #endif
760
761 /* Block allocator options */
762 if (opts & (1 << REISERFS_NO_BORDER))
763 seq_puts(seq, ",block-allocator=noborder");
764 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
765 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
766 if (opts & (1 << REISERFS_HASHED_RELOCATION))
767 seq_puts(seq, ",block-allocator=hashed_relocation");
768 if (opts & (1 << REISERFS_TEST4))
769 seq_puts(seq, ",block-allocator=test4");
770 show_alloc_options(seq, s);
771 return 0;
772 }
773
774 #ifdef CONFIG_QUOTA
775 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
776 size_t, loff_t);
777 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
778 loff_t);
779
reiserfs_get_dquots(struct inode * inode)780 static struct dquot **reiserfs_get_dquots(struct inode *inode)
781 {
782 return REISERFS_I(inode)->i_dquot;
783 }
784 #endif
785
786 static const struct super_operations reiserfs_sops = {
787 .alloc_inode = reiserfs_alloc_inode,
788 .destroy_inode = reiserfs_destroy_inode,
789 .write_inode = reiserfs_write_inode,
790 .dirty_inode = reiserfs_dirty_inode,
791 .evict_inode = reiserfs_evict_inode,
792 .put_super = reiserfs_put_super,
793 .sync_fs = reiserfs_sync_fs,
794 .freeze_fs = reiserfs_freeze,
795 .unfreeze_fs = reiserfs_unfreeze,
796 .statfs = reiserfs_statfs,
797 .remount_fs = reiserfs_remount,
798 .show_options = reiserfs_show_options,
799 #ifdef CONFIG_QUOTA
800 .quota_read = reiserfs_quota_read,
801 .quota_write = reiserfs_quota_write,
802 .get_dquots = reiserfs_get_dquots,
803 #endif
804 };
805
806 #ifdef CONFIG_QUOTA
807 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
808
809 static int reiserfs_write_dquot(struct dquot *);
810 static int reiserfs_acquire_dquot(struct dquot *);
811 static int reiserfs_release_dquot(struct dquot *);
812 static int reiserfs_mark_dquot_dirty(struct dquot *);
813 static int reiserfs_write_info(struct super_block *, int);
814 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
815
816 static const struct dquot_operations reiserfs_quota_operations = {
817 .write_dquot = reiserfs_write_dquot,
818 .acquire_dquot = reiserfs_acquire_dquot,
819 .release_dquot = reiserfs_release_dquot,
820 .mark_dirty = reiserfs_mark_dquot_dirty,
821 .write_info = reiserfs_write_info,
822 .alloc_dquot = dquot_alloc,
823 .destroy_dquot = dquot_destroy,
824 .get_next_id = dquot_get_next_id,
825 };
826
827 static const struct quotactl_ops reiserfs_qctl_operations = {
828 .quota_on = reiserfs_quota_on,
829 .quota_off = dquot_quota_off,
830 .quota_sync = dquot_quota_sync,
831 .get_state = dquot_get_state,
832 .set_info = dquot_set_dqinfo,
833 .get_dqblk = dquot_get_dqblk,
834 .set_dqblk = dquot_set_dqblk,
835 };
836 #endif
837
838 static const struct export_operations reiserfs_export_ops = {
839 .encode_fh = reiserfs_encode_fh,
840 .fh_to_dentry = reiserfs_fh_to_dentry,
841 .fh_to_parent = reiserfs_fh_to_parent,
842 .get_parent = reiserfs_get_parent,
843 };
844
845 /*
846 * this struct is used in reiserfs_getopt () for containing the value for
847 * those mount options that have values rather than being toggles.
848 */
849 typedef struct {
850 char *value;
851 /*
852 * bitmask which is to set on mount_options bitmask
853 * when this value is found, 0 is no bits are to be changed.
854 */
855 int setmask;
856 /*
857 * bitmask which is to clear on mount_options bitmask
858 * when this value is found, 0 is no bits are to be changed.
859 * This is applied BEFORE setmask
860 */
861 int clrmask;
862 } arg_desc_t;
863
864 /* Set this bit in arg_required to allow empty arguments */
865 #define REISERFS_OPT_ALLOWEMPTY 31
866
867 /*
868 * this struct is used in reiserfs_getopt() for describing the
869 * set of reiserfs mount options
870 */
871 typedef struct {
872 char *option_name;
873
874 /* 0 if argument is not required, not 0 otherwise */
875 int arg_required;
876
877 /* list of values accepted by an option */
878 const arg_desc_t *values;
879
880 /*
881 * bitmask which is to set on mount_options bitmask
882 * when this value is found, 0 is no bits are to be changed.
883 */
884 int setmask;
885
886 /*
887 * bitmask which is to clear on mount_options bitmask
888 * when this value is found, 0 is no bits are to be changed.
889 * This is applied BEFORE setmask
890 */
891 int clrmask;
892 } opt_desc_t;
893
894 /* possible values for -o data= */
895 static const arg_desc_t logging_mode[] = {
896 {"ordered", 1 << REISERFS_DATA_ORDERED,
897 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
898 {"journal", 1 << REISERFS_DATA_LOG,
899 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
900 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
901 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
902 {.value = NULL}
903 };
904
905 /* possible values for -o barrier= */
906 static const arg_desc_t barrier_mode[] = {
907 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
908 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
909 {.value = NULL}
910 };
911
912 /*
913 * possible values for "-o block-allocator=" and bits which are to be set in
914 * s_mount_opt of reiserfs specific part of in-core super block
915 */
916 static const arg_desc_t balloc[] = {
917 {"noborder", 1 << REISERFS_NO_BORDER, 0},
918 {"border", 0, 1 << REISERFS_NO_BORDER},
919 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
920 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
921 {"test4", 1 << REISERFS_TEST4, 0},
922 {"notest4", 0, 1 << REISERFS_TEST4},
923 {NULL, 0, 0}
924 };
925
926 static const arg_desc_t tails[] = {
927 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
928 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
929 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
930 {NULL, 0, 0}
931 };
932
933 static const arg_desc_t error_actions[] = {
934 {"panic", 1 << REISERFS_ERROR_PANIC,
935 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
936 {"ro-remount", 1 << REISERFS_ERROR_RO,
937 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
938 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
939 {"continue", 1 << REISERFS_ERROR_CONTINUE,
940 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
941 #endif
942 {NULL, 0, 0},
943 };
944
945 /*
946 * proceed only one option from a list *cur - string containing of mount
947 * options
948 * opts - array of options which are accepted
949 * opt_arg - if option is found and requires an argument and if it is specifed
950 * in the input - pointer to the argument is stored here
951 * bit_flags - if option requires to set a certain bit - it is set here
952 * return -1 if unknown option is found, opt->arg_required otherwise
953 */
reiserfs_getopt(struct super_block * s,char ** cur,opt_desc_t * opts,char ** opt_arg,unsigned long * bit_flags)954 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
955 char **opt_arg, unsigned long *bit_flags)
956 {
957 char *p;
958 /*
959 * foo=bar,
960 * ^ ^ ^
961 * | | +-- option_end
962 * | +-- arg_start
963 * +-- option_start
964 */
965 const opt_desc_t *opt;
966 const arg_desc_t *arg;
967
968 p = *cur;
969
970 /* assume argument cannot contain commas */
971 *cur = strchr(p, ',');
972 if (*cur) {
973 *(*cur) = '\0';
974 (*cur)++;
975 }
976
977 if (!strncmp(p, "alloc=", 6)) {
978 /*
979 * Ugly special case, probably we should redo options
980 * parser so that it can understand several arguments for
981 * some options, also so that it can fill several bitfields
982 * with option values.
983 */
984 if (reiserfs_parse_alloc_options(s, p + 6)) {
985 return -1;
986 } else {
987 return 0;
988 }
989 }
990
991 /* for every option in the list */
992 for (opt = opts; opt->option_name; opt++) {
993 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
994 if (bit_flags) {
995 if (opt->clrmask ==
996 (1 << REISERFS_UNSUPPORTED_OPT))
997 reiserfs_warning(s, "super-6500",
998 "%s not supported.\n",
999 p);
1000 else
1001 *bit_flags &= ~opt->clrmask;
1002 if (opt->setmask ==
1003 (1 << REISERFS_UNSUPPORTED_OPT))
1004 reiserfs_warning(s, "super-6501",
1005 "%s not supported.\n",
1006 p);
1007 else
1008 *bit_flags |= opt->setmask;
1009 }
1010 break;
1011 }
1012 }
1013 if (!opt->option_name) {
1014 reiserfs_warning(s, "super-6502",
1015 "unknown mount option \"%s\"", p);
1016 return -1;
1017 }
1018
1019 p += strlen(opt->option_name);
1020 switch (*p) {
1021 case '=':
1022 if (!opt->arg_required) {
1023 reiserfs_warning(s, "super-6503",
1024 "the option \"%s\" does not "
1025 "require an argument\n",
1026 opt->option_name);
1027 return -1;
1028 }
1029 break;
1030
1031 case 0:
1032 if (opt->arg_required) {
1033 reiserfs_warning(s, "super-6504",
1034 "the option \"%s\" requires an "
1035 "argument\n", opt->option_name);
1036 return -1;
1037 }
1038 break;
1039 default:
1040 reiserfs_warning(s, "super-6505",
1041 "head of option \"%s\" is only correct\n",
1042 opt->option_name);
1043 return -1;
1044 }
1045
1046 /*
1047 * move to the argument, or to next option if argument is not
1048 * required
1049 */
1050 p++;
1051
1052 if (opt->arg_required
1053 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1054 && !strlen(p)) {
1055 /* this catches "option=," if not allowed */
1056 reiserfs_warning(s, "super-6506",
1057 "empty argument for \"%s\"\n",
1058 opt->option_name);
1059 return -1;
1060 }
1061
1062 if (!opt->values) {
1063 /* *=NULLopt_arg contains pointer to argument */
1064 *opt_arg = p;
1065 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1066 }
1067
1068 /* values possible for this option are listed in opt->values */
1069 for (arg = opt->values; arg->value; arg++) {
1070 if (!strcmp(p, arg->value)) {
1071 if (bit_flags) {
1072 *bit_flags &= ~arg->clrmask;
1073 *bit_flags |= arg->setmask;
1074 }
1075 return opt->arg_required;
1076 }
1077 }
1078
1079 reiserfs_warning(s, "super-6506",
1080 "bad value \"%s\" for option \"%s\"\n", p,
1081 opt->option_name);
1082 return -1;
1083 }
1084
1085 /* returns 0 if something is wrong in option string, 1 - otherwise */
reiserfs_parse_options(struct super_block * s,char * options,unsigned long * mount_options,unsigned long * blocks,char ** jdev_name,unsigned int * commit_max_age,char ** qf_names,unsigned int * qfmt)1086 static int reiserfs_parse_options(struct super_block *s,
1087
1088 /* string given via mount's -o */
1089 char *options,
1090
1091 /*
1092 * after the parsing phase, contains the
1093 * collection of bitflags defining what
1094 * mount options were selected.
1095 */
1096 unsigned long *mount_options,
1097
1098 /* strtol-ed from NNN of resize=NNN */
1099 unsigned long *blocks,
1100 char **jdev_name,
1101 unsigned int *commit_max_age,
1102 char **qf_names,
1103 unsigned int *qfmt)
1104 {
1105 int c;
1106 char *arg = NULL;
1107 char *pos;
1108 opt_desc_t opts[] = {
1109 /*
1110 * Compatibility stuff, so that -o notail for old
1111 * setups still work
1112 */
1113 {"tails",.arg_required = 't',.values = tails},
1114 {"notail",.clrmask =
1115 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1116 {"conv",.setmask = 1 << REISERFS_CONVERT},
1117 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1118 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1119 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1120 #ifdef CONFIG_REISERFS_FS_XATTR
1121 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1122 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1123 #else
1124 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1125 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1126 #endif
1127 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1128 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1129 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1130 #else
1131 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1132 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1133 #endif
1134 {.option_name = "nolog"},
1135 {"replayonly",.setmask = 1 << REPLAYONLY},
1136 {"block-allocator",.arg_required = 'a',.values = balloc},
1137 {"data",.arg_required = 'd',.values = logging_mode},
1138 {"barrier",.arg_required = 'b',.values = barrier_mode},
1139 {"resize",.arg_required = 'r',.values = NULL},
1140 {"jdev",.arg_required = 'j',.values = NULL},
1141 {"nolargeio",.arg_required = 'w',.values = NULL},
1142 {"commit",.arg_required = 'c',.values = NULL},
1143 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1144 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1145 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1146 {"errors",.arg_required = 'e',.values = error_actions},
1147 {"usrjquota",.arg_required =
1148 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1149 {"grpjquota",.arg_required =
1150 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1151 {"jqfmt",.arg_required = 'f',.values = NULL},
1152 {.option_name = NULL}
1153 };
1154
1155 *blocks = 0;
1156 if (!options || !*options)
1157 /*
1158 * use default configuration: create tails, journaling on, no
1159 * conversion to newest format
1160 */
1161 return 1;
1162
1163 for (pos = options; pos;) {
1164 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1165 if (c == -1)
1166 /* wrong option is given */
1167 return 0;
1168
1169 if (c == 'r') {
1170 char *p;
1171
1172 p = NULL;
1173 /* "resize=NNN" or "resize=auto" */
1174
1175 if (!strcmp(arg, "auto")) {
1176 /* From JFS code, to auto-get the size. */
1177 *blocks =
1178 s->s_bdev->bd_inode->i_size >> s->
1179 s_blocksize_bits;
1180 } else {
1181 *blocks = simple_strtoul(arg, &p, 0);
1182 if (*p != '\0') {
1183 /* NNN does not look like a number */
1184 reiserfs_warning(s, "super-6507",
1185 "bad value %s for "
1186 "-oresize\n", arg);
1187 return 0;
1188 }
1189 }
1190 }
1191
1192 if (c == 'c') {
1193 char *p = NULL;
1194 unsigned long val = simple_strtoul(arg, &p, 0);
1195 /* commit=NNN (time in seconds) */
1196 if (*p != '\0' || val >= (unsigned int)-1) {
1197 reiserfs_warning(s, "super-6508",
1198 "bad value %s for -ocommit\n",
1199 arg);
1200 return 0;
1201 }
1202 *commit_max_age = (unsigned int)val;
1203 }
1204
1205 if (c == 'w') {
1206 reiserfs_warning(s, "super-6509", "nolargeio option "
1207 "is no longer supported");
1208 return 0;
1209 }
1210
1211 if (c == 'j') {
1212 if (arg && *arg && jdev_name) {
1213 /* Hm, already assigned? */
1214 if (*jdev_name) {
1215 reiserfs_warning(s, "super-6510",
1216 "journal device was "
1217 "already specified to "
1218 "be %s", *jdev_name);
1219 return 0;
1220 }
1221 *jdev_name = arg;
1222 }
1223 }
1224 #ifdef CONFIG_QUOTA
1225 if (c == 'u' || c == 'g') {
1226 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1227
1228 if (sb_any_quota_loaded(s) &&
1229 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1230 reiserfs_warning(s, "super-6511",
1231 "cannot change journaled "
1232 "quota options when quota "
1233 "turned on.");
1234 return 0;
1235 }
1236 if (*arg) { /* Some filename specified? */
1237 if (REISERFS_SB(s)->s_qf_names[qtype]
1238 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1239 arg)) {
1240 reiserfs_warning(s, "super-6512",
1241 "%s quota file "
1242 "already specified.",
1243 QTYPE2NAME(qtype));
1244 return 0;
1245 }
1246 if (strchr(arg, '/')) {
1247 reiserfs_warning(s, "super-6513",
1248 "quotafile must be "
1249 "on filesystem root.");
1250 return 0;
1251 }
1252 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1253 if (!qf_names[qtype]) {
1254 reiserfs_warning(s, "reiserfs-2502",
1255 "not enough memory "
1256 "for storing "
1257 "quotafile name.");
1258 return 0;
1259 }
1260 if (qtype == USRQUOTA)
1261 *mount_options |= 1 << REISERFS_USRQUOTA;
1262 else
1263 *mount_options |= 1 << REISERFS_GRPQUOTA;
1264 } else {
1265 if (qf_names[qtype] !=
1266 REISERFS_SB(s)->s_qf_names[qtype])
1267 kfree(qf_names[qtype]);
1268 qf_names[qtype] = NULL;
1269 if (qtype == USRQUOTA)
1270 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1271 else
1272 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1273 }
1274 }
1275 if (c == 'f') {
1276 if (!strcmp(arg, "vfsold"))
1277 *qfmt = QFMT_VFS_OLD;
1278 else if (!strcmp(arg, "vfsv0"))
1279 *qfmt = QFMT_VFS_V0;
1280 else {
1281 reiserfs_warning(s, "super-6514",
1282 "unknown quota format "
1283 "specified.");
1284 return 0;
1285 }
1286 if (sb_any_quota_loaded(s) &&
1287 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1288 reiserfs_warning(s, "super-6515",
1289 "cannot change journaled "
1290 "quota options when quota "
1291 "turned on.");
1292 return 0;
1293 }
1294 }
1295 #else
1296 if (c == 'u' || c == 'g' || c == 'f') {
1297 reiserfs_warning(s, "reiserfs-2503", "journaled "
1298 "quota options not supported.");
1299 return 0;
1300 }
1301 #endif
1302 }
1303
1304 #ifdef CONFIG_QUOTA
1305 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1306 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1307 reiserfs_warning(s, "super-6515",
1308 "journaled quota format not specified.");
1309 return 0;
1310 }
1311 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1312 sb_has_quota_loaded(s, USRQUOTA)) ||
1313 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1314 sb_has_quota_loaded(s, GRPQUOTA))) {
1315 reiserfs_warning(s, "super-6516", "quota options must "
1316 "be present when quota is turned on.");
1317 return 0;
1318 }
1319 #endif
1320
1321 return 1;
1322 }
1323
switch_data_mode(struct super_block * s,unsigned long mode)1324 static void switch_data_mode(struct super_block *s, unsigned long mode)
1325 {
1326 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1327 (1 << REISERFS_DATA_ORDERED) |
1328 (1 << REISERFS_DATA_WRITEBACK));
1329 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1330 }
1331
handle_data_mode(struct super_block * s,unsigned long mount_options)1332 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1333 {
1334 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1335 if (!reiserfs_data_log(s)) {
1336 switch_data_mode(s, REISERFS_DATA_LOG);
1337 reiserfs_info(s, "switching to journaled data mode\n");
1338 }
1339 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1340 if (!reiserfs_data_ordered(s)) {
1341 switch_data_mode(s, REISERFS_DATA_ORDERED);
1342 reiserfs_info(s, "switching to ordered data mode\n");
1343 }
1344 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1345 if (!reiserfs_data_writeback(s)) {
1346 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1347 reiserfs_info(s, "switching to writeback data mode\n");
1348 }
1349 }
1350 }
1351
handle_barrier_mode(struct super_block * s,unsigned long bits)1352 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1353 {
1354 int flush = (1 << REISERFS_BARRIER_FLUSH);
1355 int none = (1 << REISERFS_BARRIER_NONE);
1356 int all_barrier = flush | none;
1357
1358 if (bits & all_barrier) {
1359 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1360 if (bits & flush) {
1361 REISERFS_SB(s)->s_mount_opt |= flush;
1362 printk("reiserfs: enabling write barrier flush mode\n");
1363 } else if (bits & none) {
1364 REISERFS_SB(s)->s_mount_opt |= none;
1365 printk("reiserfs: write barriers turned off\n");
1366 }
1367 }
1368 }
1369
handle_attrs(struct super_block * s)1370 static void handle_attrs(struct super_block *s)
1371 {
1372 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1373
1374 if (reiserfs_attrs(s)) {
1375 if (old_format_only(s)) {
1376 reiserfs_warning(s, "super-6517", "cannot support "
1377 "attributes on 3.5.x disk format");
1378 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1379 return;
1380 }
1381 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1382 reiserfs_warning(s, "super-6518", "cannot support "
1383 "attributes until flag is set in "
1384 "super-block");
1385 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1386 }
1387 }
1388 }
1389
1390 #ifdef CONFIG_QUOTA
handle_quota_files(struct super_block * s,char ** qf_names,unsigned int * qfmt)1391 static void handle_quota_files(struct super_block *s, char **qf_names,
1392 unsigned int *qfmt)
1393 {
1394 int i;
1395
1396 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1397 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1398 kfree(REISERFS_SB(s)->s_qf_names[i]);
1399 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1400 }
1401 if (*qfmt)
1402 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1403 }
1404 #endif
1405
reiserfs_remount(struct super_block * s,int * mount_flags,char * arg)1406 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1407 {
1408 struct reiserfs_super_block *rs;
1409 struct reiserfs_transaction_handle th;
1410 unsigned long blocks;
1411 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1412 unsigned long safe_mask = 0;
1413 unsigned int commit_max_age = (unsigned int)-1;
1414 struct reiserfs_journal *journal = SB_JOURNAL(s);
1415 char *new_opts;
1416 int err;
1417 char *qf_names[REISERFS_MAXQUOTAS];
1418 unsigned int qfmt = 0;
1419 #ifdef CONFIG_QUOTA
1420 int i;
1421 #endif
1422
1423 new_opts = kstrdup(arg, GFP_KERNEL);
1424 if (arg && !new_opts)
1425 return -ENOMEM;
1426
1427 sync_filesystem(s);
1428 reiserfs_write_lock(s);
1429
1430 #ifdef CONFIG_QUOTA
1431 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1432 #endif
1433
1434 rs = SB_DISK_SUPER_BLOCK(s);
1435
1436 if (!reiserfs_parse_options
1437 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1438 qf_names, &qfmt)) {
1439 #ifdef CONFIG_QUOTA
1440 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1441 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1442 kfree(qf_names[i]);
1443 #endif
1444 err = -EINVAL;
1445 goto out_err_unlock;
1446 }
1447 #ifdef CONFIG_QUOTA
1448 handle_quota_files(s, qf_names, &qfmt);
1449 #endif
1450
1451 handle_attrs(s);
1452
1453 /* Add options that are safe here */
1454 safe_mask |= 1 << REISERFS_SMALLTAIL;
1455 safe_mask |= 1 << REISERFS_LARGETAIL;
1456 safe_mask |= 1 << REISERFS_NO_BORDER;
1457 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1458 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1459 safe_mask |= 1 << REISERFS_TEST4;
1460 safe_mask |= 1 << REISERFS_ATTRS;
1461 safe_mask |= 1 << REISERFS_XATTRS_USER;
1462 safe_mask |= 1 << REISERFS_POSIXACL;
1463 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1464 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1465 safe_mask |= 1 << REISERFS_ERROR_RO;
1466 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1467 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1468 safe_mask |= 1 << REISERFS_USRQUOTA;
1469 safe_mask |= 1 << REISERFS_GRPQUOTA;
1470
1471 /*
1472 * Update the bitmask, taking care to keep
1473 * the bits we're not allowed to change here
1474 */
1475 REISERFS_SB(s)->s_mount_opt =
1476 (REISERFS_SB(s)->
1477 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1478
1479 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1480 journal->j_max_commit_age = commit_max_age;
1481 journal->j_max_trans_age = commit_max_age;
1482 } else if (commit_max_age == 0) {
1483 /* 0 means restore defaults. */
1484 journal->j_max_commit_age = journal->j_default_max_commit_age;
1485 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1486 }
1487
1488 if (blocks) {
1489 err = reiserfs_resize(s, blocks);
1490 if (err != 0)
1491 goto out_err_unlock;
1492 }
1493
1494 if (*mount_flags & MS_RDONLY) {
1495 reiserfs_write_unlock(s);
1496 reiserfs_xattr_init(s, *mount_flags);
1497 /* remount read-only */
1498 if (s->s_flags & MS_RDONLY)
1499 /* it is read-only already */
1500 goto out_ok_unlocked;
1501
1502 err = dquot_suspend(s, -1);
1503 if (err < 0)
1504 goto out_err;
1505
1506 /* try to remount file system with read-only permissions */
1507 if (sb_umount_state(rs) == REISERFS_VALID_FS
1508 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1509 goto out_ok_unlocked;
1510 }
1511
1512 reiserfs_write_lock(s);
1513
1514 err = journal_begin(&th, s, 10);
1515 if (err)
1516 goto out_err_unlock;
1517
1518 /* Mounting a rw partition read-only. */
1519 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1520 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1521 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1522 } else {
1523 /* remount read-write */
1524 if (!(s->s_flags & MS_RDONLY)) {
1525 reiserfs_write_unlock(s);
1526 reiserfs_xattr_init(s, *mount_flags);
1527 goto out_ok_unlocked; /* We are read-write already */
1528 }
1529
1530 if (reiserfs_is_journal_aborted(journal)) {
1531 err = journal->j_errno;
1532 goto out_err_unlock;
1533 }
1534
1535 handle_data_mode(s, mount_options);
1536 handle_barrier_mode(s, mount_options);
1537 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1538
1539 /* now it is safe to call journal_begin */
1540 s->s_flags &= ~MS_RDONLY;
1541 err = journal_begin(&th, s, 10);
1542 if (err)
1543 goto out_err_unlock;
1544
1545 /* Mount a partition which is read-only, read-write */
1546 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1547 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1548 s->s_flags &= ~MS_RDONLY;
1549 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1550 if (!old_format_only(s))
1551 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1552 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1553 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1554 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1555 }
1556 /* this will force a full flush of all journal lists */
1557 SB_JOURNAL(s)->j_must_wait = 1;
1558 err = journal_end(&th);
1559 if (err)
1560 goto out_err_unlock;
1561
1562 reiserfs_write_unlock(s);
1563 if (!(*mount_flags & MS_RDONLY)) {
1564 dquot_resume(s, -1);
1565 reiserfs_write_lock(s);
1566 finish_unfinished(s);
1567 reiserfs_write_unlock(s);
1568 reiserfs_xattr_init(s, *mount_flags);
1569 }
1570
1571 out_ok_unlocked:
1572 if (new_opts)
1573 replace_mount_options(s, new_opts);
1574 return 0;
1575
1576 out_err_unlock:
1577 reiserfs_write_unlock(s);
1578 out_err:
1579 kfree(new_opts);
1580 return err;
1581 }
1582
read_super_block(struct super_block * s,int offset)1583 static int read_super_block(struct super_block *s, int offset)
1584 {
1585 struct buffer_head *bh;
1586 struct reiserfs_super_block *rs;
1587 int fs_blocksize;
1588
1589 bh = sb_bread(s, offset / s->s_blocksize);
1590 if (!bh) {
1591 reiserfs_warning(s, "sh-2006",
1592 "bread failed (dev %s, block %lu, size %lu)",
1593 s->s_id, offset / s->s_blocksize,
1594 s->s_blocksize);
1595 return 1;
1596 }
1597
1598 rs = (struct reiserfs_super_block *)bh->b_data;
1599 if (!is_any_reiserfs_magic_string(rs)) {
1600 brelse(bh);
1601 return 1;
1602 }
1603 /*
1604 * ok, reiserfs signature (old or new) found in at the given offset
1605 */
1606 fs_blocksize = sb_blocksize(rs);
1607 brelse(bh);
1608 sb_set_blocksize(s, fs_blocksize);
1609
1610 bh = sb_bread(s, offset / s->s_blocksize);
1611 if (!bh) {
1612 reiserfs_warning(s, "sh-2007",
1613 "bread failed (dev %s, block %lu, size %lu)",
1614 s->s_id, offset / s->s_blocksize,
1615 s->s_blocksize);
1616 return 1;
1617 }
1618
1619 rs = (struct reiserfs_super_block *)bh->b_data;
1620 if (sb_blocksize(rs) != s->s_blocksize) {
1621 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1622 "filesystem on (dev %s, block %llu, size %lu)",
1623 s->s_id,
1624 (unsigned long long)bh->b_blocknr,
1625 s->s_blocksize);
1626 brelse(bh);
1627 return 1;
1628 }
1629
1630 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1631 brelse(bh);
1632 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1633 "--rebuild-tree run detected. Please run\n"
1634 "reiserfsck --rebuild-tree and wait for a "
1635 "completion. If that fails\n"
1636 "get newer reiserfsprogs package");
1637 return 1;
1638 }
1639
1640 SB_BUFFER_WITH_SB(s) = bh;
1641 SB_DISK_SUPER_BLOCK(s) = rs;
1642
1643 /*
1644 * magic is of non-standard journal filesystem, look at s_version to
1645 * find which format is in use
1646 */
1647 if (is_reiserfs_jr(rs)) {
1648 if (sb_version(rs) == REISERFS_VERSION_2)
1649 reiserfs_info(s, "found reiserfs format \"3.6\""
1650 " with non-standard journal\n");
1651 else if (sb_version(rs) == REISERFS_VERSION_1)
1652 reiserfs_info(s, "found reiserfs format \"3.5\""
1653 " with non-standard journal\n");
1654 else {
1655 reiserfs_warning(s, "sh-2012", "found unknown "
1656 "format \"%u\" of reiserfs with "
1657 "non-standard magic", sb_version(rs));
1658 return 1;
1659 }
1660 } else
1661 /*
1662 * s_version of standard format may contain incorrect
1663 * information, so we just look at the magic string
1664 */
1665 reiserfs_info(s,
1666 "found reiserfs format \"%s\" with standard journal\n",
1667 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1668
1669 s->s_op = &reiserfs_sops;
1670 s->s_export_op = &reiserfs_export_ops;
1671 #ifdef CONFIG_QUOTA
1672 s->s_qcop = &reiserfs_qctl_operations;
1673 s->dq_op = &reiserfs_quota_operations;
1674 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1675 #endif
1676
1677 /*
1678 * new format is limited by the 32 bit wide i_blocks field, want to
1679 * be one full block below that.
1680 */
1681 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1682 return 0;
1683 }
1684
1685 /* after journal replay, reread all bitmap and super blocks */
reread_meta_blocks(struct super_block * s)1686 static int reread_meta_blocks(struct super_block *s)
1687 {
1688 ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1689 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1690 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1691 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1692 return 1;
1693 }
1694
1695 return 0;
1696 }
1697
1698 /* hash detection stuff */
1699
1700 /*
1701 * if root directory is empty - we set default - Yura's - hash and
1702 * warn about it
1703 * FIXME: we look for only one name in a directory. If tea and yura
1704 * both have the same value - we ask user to send report to the
1705 * mailing list
1706 */
find_hash_out(struct super_block * s)1707 static __u32 find_hash_out(struct super_block *s)
1708 {
1709 int retval;
1710 struct inode *inode;
1711 struct cpu_key key;
1712 INITIALIZE_PATH(path);
1713 struct reiserfs_dir_entry de;
1714 struct reiserfs_de_head *deh;
1715 __u32 hash = DEFAULT_HASH;
1716 __u32 deh_hashval, teahash, r5hash, yurahash;
1717
1718 inode = d_inode(s->s_root);
1719
1720 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1721 retval = search_by_entry_key(s, &key, &path, &de);
1722 if (retval == IO_ERROR) {
1723 pathrelse(&path);
1724 return UNSET_HASH;
1725 }
1726 if (retval == NAME_NOT_FOUND)
1727 de.de_entry_num--;
1728
1729 set_de_name_and_namelen(&de);
1730 deh = de.de_deh + de.de_entry_num;
1731
1732 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1733 /* allow override in this case */
1734 if (reiserfs_rupasov_hash(s))
1735 hash = YURA_HASH;
1736 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1737 goto out;
1738 }
1739
1740 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1741 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1742 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1743 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1744
1745 if ((teahash == r5hash && deh_hashval == r5hash) ||
1746 (teahash == yurahash && deh_hashval == yurahash) ||
1747 (r5hash == yurahash && deh_hashval == yurahash)) {
1748 reiserfs_warning(s, "reiserfs-2506",
1749 "Unable to automatically detect hash "
1750 "function. Please mount with -o "
1751 "hash={tea,rupasov,r5}");
1752 hash = UNSET_HASH;
1753 goto out;
1754 }
1755
1756 if (deh_hashval == yurahash)
1757 hash = YURA_HASH;
1758 else if (deh_hashval == teahash)
1759 hash = TEA_HASH;
1760 else if (deh_hashval == r5hash)
1761 hash = R5_HASH;
1762 else {
1763 reiserfs_warning(s, "reiserfs-2506",
1764 "Unrecognised hash function");
1765 hash = UNSET_HASH;
1766 }
1767 out:
1768 pathrelse(&path);
1769 return hash;
1770 }
1771
1772 /* finds out which hash names are sorted with */
what_hash(struct super_block * s)1773 static int what_hash(struct super_block *s)
1774 {
1775 __u32 code;
1776
1777 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1778
1779 /*
1780 * reiserfs_hash_detect() == true if any of the hash mount options
1781 * were used. We must check them to make sure the user isn't
1782 * using a bad hash value
1783 */
1784 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1785 code = find_hash_out(s);
1786
1787 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1788 /*
1789 * detection has found the hash, and we must check against the
1790 * mount options
1791 */
1792 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1793 reiserfs_warning(s, "reiserfs-2507",
1794 "Error, %s hash detected, "
1795 "unable to force rupasov hash",
1796 reiserfs_hashname(code));
1797 code = UNSET_HASH;
1798 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1799 reiserfs_warning(s, "reiserfs-2508",
1800 "Error, %s hash detected, "
1801 "unable to force tea hash",
1802 reiserfs_hashname(code));
1803 code = UNSET_HASH;
1804 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1805 reiserfs_warning(s, "reiserfs-2509",
1806 "Error, %s hash detected, "
1807 "unable to force r5 hash",
1808 reiserfs_hashname(code));
1809 code = UNSET_HASH;
1810 }
1811 } else {
1812 /*
1813 * find_hash_out was not called or
1814 * could not determine the hash
1815 */
1816 if (reiserfs_rupasov_hash(s)) {
1817 code = YURA_HASH;
1818 } else if (reiserfs_tea_hash(s)) {
1819 code = TEA_HASH;
1820 } else if (reiserfs_r5_hash(s)) {
1821 code = R5_HASH;
1822 }
1823 }
1824
1825 /*
1826 * if we are mounted RW, and we have a new valid hash code, update
1827 * the super
1828 */
1829 if (code != UNSET_HASH &&
1830 !(s->s_flags & MS_RDONLY) &&
1831 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1832 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1833 }
1834 return code;
1835 }
1836
1837 /* return pointer to appropriate function */
hash_function(struct super_block * s)1838 static hashf_t hash_function(struct super_block *s)
1839 {
1840 switch (what_hash(s)) {
1841 case TEA_HASH:
1842 reiserfs_info(s, "Using tea hash to sort names\n");
1843 return keyed_hash;
1844 case YURA_HASH:
1845 reiserfs_info(s, "Using rupasov hash to sort names\n");
1846 return yura_hash;
1847 case R5_HASH:
1848 reiserfs_info(s, "Using r5 hash to sort names\n");
1849 return r5_hash;
1850 }
1851 return NULL;
1852 }
1853
1854 /* this is used to set up correct value for old partitions */
function2code(hashf_t func)1855 static int function2code(hashf_t func)
1856 {
1857 if (func == keyed_hash)
1858 return TEA_HASH;
1859 if (func == yura_hash)
1860 return YURA_HASH;
1861 if (func == r5_hash)
1862 return R5_HASH;
1863
1864 BUG(); /* should never happen */
1865
1866 return 0;
1867 }
1868
1869 #define SWARN(silent, s, id, ...) \
1870 if (!(silent)) \
1871 reiserfs_warning(s, id, __VA_ARGS__)
1872
reiserfs_fill_super(struct super_block * s,void * data,int silent)1873 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1874 {
1875 struct inode *root_inode;
1876 struct reiserfs_transaction_handle th;
1877 int old_format = 0;
1878 unsigned long blocks;
1879 unsigned int commit_max_age = 0;
1880 int jinit_done = 0;
1881 struct reiserfs_iget_args args;
1882 struct reiserfs_super_block *rs;
1883 char *jdev_name;
1884 struct reiserfs_sb_info *sbi;
1885 int errval = -EINVAL;
1886 char *qf_names[REISERFS_MAXQUOTAS] = {};
1887 unsigned int qfmt = 0;
1888
1889 save_mount_options(s, data);
1890
1891 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1892 if (!sbi)
1893 return -ENOMEM;
1894 s->s_fs_info = sbi;
1895 /* Set default values for options: non-aggressive tails, RO on errors */
1896 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1897 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1898 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1899 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1900 sbi->s_alloc_options.preallocmin = 0;
1901 /* Preallocate by 16 blocks (17-1) at once */
1902 sbi->s_alloc_options.preallocsize = 17;
1903 /* setup default block allocator options */
1904 reiserfs_init_alloc_options(s);
1905
1906 spin_lock_init(&sbi->old_work_lock);
1907 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1908 mutex_init(&sbi->lock);
1909 sbi->lock_depth = -1;
1910
1911 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1912 s->s_id);
1913 if (!sbi->commit_wq) {
1914 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1915 errval = -ENOMEM;
1916 goto error_unlocked;
1917 }
1918
1919 jdev_name = NULL;
1920 if (reiserfs_parse_options
1921 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1922 &commit_max_age, qf_names, &qfmt) == 0) {
1923 goto error_unlocked;
1924 }
1925 if (jdev_name && jdev_name[0]) {
1926 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1927 if (!sbi->s_jdev) {
1928 SWARN(silent, s, "", "Cannot allocate memory for "
1929 "journal device name");
1930 goto error;
1931 }
1932 }
1933 #ifdef CONFIG_QUOTA
1934 handle_quota_files(s, qf_names, &qfmt);
1935 #endif
1936
1937 if (blocks) {
1938 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1939 goto error_unlocked;
1940 }
1941
1942 /*
1943 * try old format (undistributed bitmap, super block in 8-th 1k
1944 * block of a device)
1945 */
1946 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1947 old_format = 1;
1948
1949 /*
1950 * try new format (64-th 1k block), which can contain reiserfs
1951 * super block
1952 */
1953 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1954 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1955 s->s_id);
1956 goto error_unlocked;
1957 }
1958
1959 rs = SB_DISK_SUPER_BLOCK(s);
1960 /*
1961 * Let's do basic sanity check to verify that underlying device is not
1962 * smaller than the filesystem. If the check fails then abort and
1963 * scream, because bad stuff will happen otherwise.
1964 */
1965 if (s->s_bdev && s->s_bdev->bd_inode
1966 && i_size_read(s->s_bdev->bd_inode) <
1967 sb_block_count(rs) * sb_blocksize(rs)) {
1968 SWARN(silent, s, "", "Filesystem cannot be "
1969 "mounted because it is bigger than the device");
1970 SWARN(silent, s, "", "You may need to run fsck "
1971 "or increase size of your LVM partition");
1972 SWARN(silent, s, "", "Or may be you forgot to "
1973 "reboot after fdisk when it told you to");
1974 goto error_unlocked;
1975 }
1976
1977 sbi->s_mount_state = SB_REISERFS_STATE(s);
1978 sbi->s_mount_state = REISERFS_VALID_FS;
1979
1980 if ((errval = reiserfs_init_bitmap_cache(s))) {
1981 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1982 goto error_unlocked;
1983 }
1984
1985 errval = -EINVAL;
1986 #ifdef CONFIG_REISERFS_CHECK
1987 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1988 SWARN(silent, s, "", "- it is slow mode for debugging.");
1989 #endif
1990
1991 /* make data=ordered the default */
1992 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1993 !reiserfs_data_writeback(s)) {
1994 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1995 }
1996
1997 if (reiserfs_data_log(s)) {
1998 reiserfs_info(s, "using journaled data mode\n");
1999 } else if (reiserfs_data_ordered(s)) {
2000 reiserfs_info(s, "using ordered data mode\n");
2001 } else {
2002 reiserfs_info(s, "using writeback data mode\n");
2003 }
2004 if (reiserfs_barrier_flush(s)) {
2005 printk("reiserfs: using flush barriers\n");
2006 }
2007
2008 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2009 SWARN(silent, s, "sh-2022",
2010 "unable to initialize journal space");
2011 goto error_unlocked;
2012 } else {
2013 /*
2014 * once this is set, journal_release must be called
2015 * if we error out of the mount
2016 */
2017 jinit_done = 1;
2018 }
2019
2020 if (reread_meta_blocks(s)) {
2021 SWARN(silent, s, "jmacd-9",
2022 "unable to reread meta blocks after journal init");
2023 goto error_unlocked;
2024 }
2025
2026 if (replay_only(s))
2027 goto error_unlocked;
2028
2029 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2030 SWARN(silent, s, "clm-7000",
2031 "Detected readonly device, marking FS readonly");
2032 s->s_flags |= MS_RDONLY;
2033 }
2034 args.objectid = REISERFS_ROOT_OBJECTID;
2035 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2036 root_inode =
2037 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2038 reiserfs_init_locked_inode, (void *)&args);
2039 if (!root_inode) {
2040 SWARN(silent, s, "jmacd-10", "get root inode failed");
2041 goto error_unlocked;
2042 }
2043
2044 /*
2045 * This path assumed to be called with the BKL in the old times.
2046 * Now we have inherited the big reiserfs lock from it and many
2047 * reiserfs helpers called in the mount path and elsewhere require
2048 * this lock to be held even if it's not always necessary. Let's be
2049 * conservative and hold it early. The window can be reduced after
2050 * careful review of the code.
2051 */
2052 reiserfs_write_lock(s);
2053
2054 if (root_inode->i_state & I_NEW) {
2055 reiserfs_read_locked_inode(root_inode, &args);
2056 unlock_new_inode(root_inode);
2057 }
2058
2059 s->s_root = d_make_root(root_inode);
2060 if (!s->s_root)
2061 goto error;
2062 /* define and initialize hash function */
2063 sbi->s_hash_function = hash_function(s);
2064 if (sbi->s_hash_function == NULL) {
2065 dput(s->s_root);
2066 s->s_root = NULL;
2067 goto error;
2068 }
2069
2070 if (is_reiserfs_3_5(rs)
2071 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2072 set_bit(REISERFS_3_5, &sbi->s_properties);
2073 else if (old_format)
2074 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2075 else
2076 set_bit(REISERFS_3_6, &sbi->s_properties);
2077
2078 if (!(s->s_flags & MS_RDONLY)) {
2079
2080 errval = journal_begin(&th, s, 1);
2081 if (errval) {
2082 dput(s->s_root);
2083 s->s_root = NULL;
2084 goto error;
2085 }
2086 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2087
2088 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2089 set_sb_fs_state(rs, 0);
2090
2091 /*
2092 * Clear out s_bmap_nr if it would wrap. We can handle this
2093 * case, but older revisions can't. This will cause the
2094 * file system to fail mount on those older implementations,
2095 * avoiding corruption. -jeffm
2096 */
2097 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2098 sb_bmap_nr(rs) != 0) {
2099 reiserfs_warning(s, "super-2030", "This file system "
2100 "claims to use %u bitmap blocks in "
2101 "its super block, but requires %u. "
2102 "Clearing to zero.", sb_bmap_nr(rs),
2103 reiserfs_bmap_count(s));
2104
2105 set_sb_bmap_nr(rs, 0);
2106 }
2107
2108 if (old_format_only(s)) {
2109 /*
2110 * filesystem of format 3.5 either with standard
2111 * or non-standard journal
2112 */
2113 if (convert_reiserfs(s)) {
2114 /* and -o conv is given */
2115 if (!silent)
2116 reiserfs_info(s,
2117 "converting 3.5 filesystem to the 3.6 format");
2118
2119 if (is_reiserfs_3_5(rs))
2120 /*
2121 * put magic string of 3.6 format.
2122 * 2.2 will not be able to
2123 * mount this filesystem anymore
2124 */
2125 memcpy(rs->s_v1.s_magic,
2126 reiserfs_3_6_magic_string,
2127 sizeof
2128 (reiserfs_3_6_magic_string));
2129
2130 set_sb_version(rs, REISERFS_VERSION_2);
2131 reiserfs_convert_objectid_map_v1(s);
2132 set_bit(REISERFS_3_6, &sbi->s_properties);
2133 clear_bit(REISERFS_3_5, &sbi->s_properties);
2134 } else if (!silent) {
2135 reiserfs_info(s, "using 3.5.x disk format\n");
2136 }
2137 } else
2138 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2139
2140
2141 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2142 errval = journal_end(&th);
2143 if (errval) {
2144 dput(s->s_root);
2145 s->s_root = NULL;
2146 goto error;
2147 }
2148
2149 reiserfs_write_unlock(s);
2150 if ((errval = reiserfs_lookup_privroot(s)) ||
2151 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2152 dput(s->s_root);
2153 s->s_root = NULL;
2154 goto error_unlocked;
2155 }
2156 reiserfs_write_lock(s);
2157
2158 /*
2159 * look for files which were to be removed in previous session
2160 */
2161 finish_unfinished(s);
2162 } else {
2163 if (old_format_only(s) && !silent) {
2164 reiserfs_info(s, "using 3.5.x disk format\n");
2165 }
2166
2167 reiserfs_write_unlock(s);
2168 if ((errval = reiserfs_lookup_privroot(s)) ||
2169 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2170 dput(s->s_root);
2171 s->s_root = NULL;
2172 goto error_unlocked;
2173 }
2174 reiserfs_write_lock(s);
2175 }
2176 /*
2177 * mark hash in super block: it could be unset. overwrite should be ok
2178 */
2179 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2180
2181 handle_attrs(s);
2182
2183 reiserfs_proc_info_init(s);
2184
2185 init_waitqueue_head(&(sbi->s_wait));
2186 spin_lock_init(&sbi->bitmap_lock);
2187
2188 reiserfs_write_unlock(s);
2189
2190 return (0);
2191
2192 error:
2193 reiserfs_write_unlock(s);
2194
2195 error_unlocked:
2196 /* kill the commit thread, free journal ram */
2197 if (jinit_done) {
2198 reiserfs_write_lock(s);
2199 journal_release_error(NULL, s);
2200 reiserfs_write_unlock(s);
2201 }
2202
2203 if (sbi->commit_wq)
2204 destroy_workqueue(sbi->commit_wq);
2205
2206 reiserfs_cancel_old_flush(s);
2207
2208 reiserfs_free_bitmap_cache(s);
2209 if (SB_BUFFER_WITH_SB(s))
2210 brelse(SB_BUFFER_WITH_SB(s));
2211 #ifdef CONFIG_QUOTA
2212 {
2213 int j;
2214 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2215 kfree(qf_names[j]);
2216 }
2217 #endif
2218 kfree(sbi);
2219
2220 s->s_fs_info = NULL;
2221 return errval;
2222 }
2223
reiserfs_statfs(struct dentry * dentry,struct kstatfs * buf)2224 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2225 {
2226 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2227
2228 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2229 buf->f_bfree = sb_free_blocks(rs);
2230 buf->f_bavail = buf->f_bfree;
2231 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2232 buf->f_bsize = dentry->d_sb->s_blocksize;
2233 /* changed to accommodate gcc folks. */
2234 buf->f_type = REISERFS_SUPER_MAGIC;
2235 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2236 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2237 sizeof(rs->s_uuid)/2);
2238
2239 return 0;
2240 }
2241
2242 #ifdef CONFIG_QUOTA
reiserfs_write_dquot(struct dquot * dquot)2243 static int reiserfs_write_dquot(struct dquot *dquot)
2244 {
2245 struct reiserfs_transaction_handle th;
2246 int ret, err;
2247 int depth;
2248
2249 reiserfs_write_lock(dquot->dq_sb);
2250 ret =
2251 journal_begin(&th, dquot->dq_sb,
2252 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2253 if (ret)
2254 goto out;
2255 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2256 ret = dquot_commit(dquot);
2257 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2258 err = journal_end(&th);
2259 if (!ret && err)
2260 ret = err;
2261 out:
2262 reiserfs_write_unlock(dquot->dq_sb);
2263 return ret;
2264 }
2265
reiserfs_acquire_dquot(struct dquot * dquot)2266 static int reiserfs_acquire_dquot(struct dquot *dquot)
2267 {
2268 struct reiserfs_transaction_handle th;
2269 int ret, err;
2270 int depth;
2271
2272 reiserfs_write_lock(dquot->dq_sb);
2273 ret =
2274 journal_begin(&th, dquot->dq_sb,
2275 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2276 if (ret)
2277 goto out;
2278 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2279 ret = dquot_acquire(dquot);
2280 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2281 err = journal_end(&th);
2282 if (!ret && err)
2283 ret = err;
2284 out:
2285 reiserfs_write_unlock(dquot->dq_sb);
2286 return ret;
2287 }
2288
reiserfs_release_dquot(struct dquot * dquot)2289 static int reiserfs_release_dquot(struct dquot *dquot)
2290 {
2291 struct reiserfs_transaction_handle th;
2292 int ret, err;
2293
2294 reiserfs_write_lock(dquot->dq_sb);
2295 ret =
2296 journal_begin(&th, dquot->dq_sb,
2297 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2298 reiserfs_write_unlock(dquot->dq_sb);
2299 if (ret) {
2300 /* Release dquot anyway to avoid endless cycle in dqput() */
2301 dquot_release(dquot);
2302 goto out;
2303 }
2304 ret = dquot_release(dquot);
2305 reiserfs_write_lock(dquot->dq_sb);
2306 err = journal_end(&th);
2307 if (!ret && err)
2308 ret = err;
2309 reiserfs_write_unlock(dquot->dq_sb);
2310 out:
2311 return ret;
2312 }
2313
reiserfs_mark_dquot_dirty(struct dquot * dquot)2314 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2315 {
2316 /* Are we journaling quotas? */
2317 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2318 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2319 dquot_mark_dquot_dirty(dquot);
2320 return reiserfs_write_dquot(dquot);
2321 } else
2322 return dquot_mark_dquot_dirty(dquot);
2323 }
2324
reiserfs_write_info(struct super_block * sb,int type)2325 static int reiserfs_write_info(struct super_block *sb, int type)
2326 {
2327 struct reiserfs_transaction_handle th;
2328 int ret, err;
2329 int depth;
2330
2331 /* Data block + inode block */
2332 reiserfs_write_lock(sb);
2333 ret = journal_begin(&th, sb, 2);
2334 if (ret)
2335 goto out;
2336 depth = reiserfs_write_unlock_nested(sb);
2337 ret = dquot_commit_info(sb, type);
2338 reiserfs_write_lock_nested(sb, depth);
2339 err = journal_end(&th);
2340 if (!ret && err)
2341 ret = err;
2342 out:
2343 reiserfs_write_unlock(sb);
2344 return ret;
2345 }
2346
2347 /*
2348 * Turn on quotas during mount time - we need to find the quota file and such...
2349 */
reiserfs_quota_on_mount(struct super_block * sb,int type)2350 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2351 {
2352 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2353 REISERFS_SB(sb)->s_jquota_fmt, type);
2354 }
2355
2356 /*
2357 * Standard function to be called on quota_on
2358 */
reiserfs_quota_on(struct super_block * sb,int type,int format_id,struct path * path)2359 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2360 struct path *path)
2361 {
2362 int err;
2363 struct inode *inode;
2364 struct reiserfs_transaction_handle th;
2365 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2366
2367 reiserfs_write_lock(sb);
2368 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2369 err = -EINVAL;
2370 goto out;
2371 }
2372
2373 /* Quotafile not on the same filesystem? */
2374 if (path->dentry->d_sb != sb) {
2375 err = -EXDEV;
2376 goto out;
2377 }
2378 inode = d_inode(path->dentry);
2379 /*
2380 * We must not pack tails for quota files on reiserfs for quota
2381 * IO to work
2382 */
2383 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2384 err = reiserfs_unpack(inode, NULL);
2385 if (err) {
2386 reiserfs_warning(sb, "super-6520",
2387 "Unpacking tail of quota file failed"
2388 " (%d). Cannot turn on quotas.", err);
2389 err = -EINVAL;
2390 goto out;
2391 }
2392 mark_inode_dirty(inode);
2393 }
2394 /* Journaling quota? */
2395 if (REISERFS_SB(sb)->s_qf_names[type]) {
2396 /* Quotafile not of fs root? */
2397 if (path->dentry->d_parent != sb->s_root)
2398 reiserfs_warning(sb, "super-6521",
2399 "Quota file not on filesystem root. "
2400 "Journalled quota will not work.");
2401 }
2402
2403 /*
2404 * When we journal data on quota file, we have to flush journal to see
2405 * all updates to the file when we bypass pagecache...
2406 */
2407 if (reiserfs_file_data_log(inode)) {
2408 /* Just start temporary transaction and finish it */
2409 err = journal_begin(&th, sb, 1);
2410 if (err)
2411 goto out;
2412 err = journal_end_sync(&th);
2413 if (err)
2414 goto out;
2415 }
2416 reiserfs_write_unlock(sb);
2417 return dquot_quota_on(sb, type, format_id, path);
2418 out:
2419 reiserfs_write_unlock(sb);
2420 return err;
2421 }
2422
2423 /*
2424 * Read data from quotafile - avoid pagecache and such because we cannot afford
2425 * acquiring the locks... As quota files are never truncated and quota code
2426 * itself serializes the operations (and no one else should touch the files)
2427 * we don't have to be afraid of races
2428 */
reiserfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)2429 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2430 size_t len, loff_t off)
2431 {
2432 struct inode *inode = sb_dqopt(sb)->files[type];
2433 unsigned long blk = off >> sb->s_blocksize_bits;
2434 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2435 size_t toread;
2436 struct buffer_head tmp_bh, *bh;
2437 loff_t i_size = i_size_read(inode);
2438
2439 if (off > i_size)
2440 return 0;
2441 if (off + len > i_size)
2442 len = i_size - off;
2443 toread = len;
2444 while (toread > 0) {
2445 tocopy =
2446 sb->s_blocksize - offset <
2447 toread ? sb->s_blocksize - offset : toread;
2448 tmp_bh.b_state = 0;
2449 /*
2450 * Quota files are without tails so we can safely
2451 * use this function
2452 */
2453 reiserfs_write_lock(sb);
2454 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2455 reiserfs_write_unlock(sb);
2456 if (err)
2457 return err;
2458 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2459 memset(data, 0, tocopy);
2460 else {
2461 bh = sb_bread(sb, tmp_bh.b_blocknr);
2462 if (!bh)
2463 return -EIO;
2464 memcpy(data, bh->b_data + offset, tocopy);
2465 brelse(bh);
2466 }
2467 offset = 0;
2468 toread -= tocopy;
2469 data += tocopy;
2470 blk++;
2471 }
2472 return len;
2473 }
2474
2475 /*
2476 * Write to quotafile (we know the transaction is already started and has
2477 * enough credits)
2478 */
reiserfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)2479 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2480 const char *data, size_t len, loff_t off)
2481 {
2482 struct inode *inode = sb_dqopt(sb)->files[type];
2483 unsigned long blk = off >> sb->s_blocksize_bits;
2484 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2485 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2486 size_t towrite = len;
2487 struct buffer_head tmp_bh, *bh;
2488
2489 if (!current->journal_info) {
2490 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2491 (unsigned long long)off, (unsigned long long)len);
2492 return -EIO;
2493 }
2494 while (towrite > 0) {
2495 tocopy = sb->s_blocksize - offset < towrite ?
2496 sb->s_blocksize - offset : towrite;
2497 tmp_bh.b_state = 0;
2498 reiserfs_write_lock(sb);
2499 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2500 reiserfs_write_unlock(sb);
2501 if (err)
2502 goto out;
2503 if (offset || tocopy != sb->s_blocksize)
2504 bh = sb_bread(sb, tmp_bh.b_blocknr);
2505 else
2506 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2507 if (!bh) {
2508 err = -EIO;
2509 goto out;
2510 }
2511 lock_buffer(bh);
2512 memcpy(bh->b_data + offset, data, tocopy);
2513 flush_dcache_page(bh->b_page);
2514 set_buffer_uptodate(bh);
2515 unlock_buffer(bh);
2516 reiserfs_write_lock(sb);
2517 reiserfs_prepare_for_journal(sb, bh, 1);
2518 journal_mark_dirty(current->journal_info, bh);
2519 if (!journal_quota)
2520 reiserfs_add_ordered_list(inode, bh);
2521 reiserfs_write_unlock(sb);
2522 brelse(bh);
2523 offset = 0;
2524 towrite -= tocopy;
2525 data += tocopy;
2526 blk++;
2527 }
2528 out:
2529 if (len == towrite)
2530 return err;
2531 if (inode->i_size < off + len - towrite)
2532 i_size_write(inode, off + len - towrite);
2533 inode->i_mtime = inode->i_ctime = current_time(inode);
2534 mark_inode_dirty(inode);
2535 return len - towrite;
2536 }
2537
2538 #endif
2539
get_super_block(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)2540 static struct dentry *get_super_block(struct file_system_type *fs_type,
2541 int flags, const char *dev_name,
2542 void *data)
2543 {
2544 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2545 }
2546
init_reiserfs_fs(void)2547 static int __init init_reiserfs_fs(void)
2548 {
2549 int ret;
2550
2551 ret = init_inodecache();
2552 if (ret)
2553 return ret;
2554
2555 reiserfs_proc_info_global_init();
2556
2557 ret = register_filesystem(&reiserfs_fs_type);
2558 if (ret)
2559 goto out;
2560
2561 return 0;
2562 out:
2563 reiserfs_proc_info_global_done();
2564 destroy_inodecache();
2565
2566 return ret;
2567 }
2568
exit_reiserfs_fs(void)2569 static void __exit exit_reiserfs_fs(void)
2570 {
2571 reiserfs_proc_info_global_done();
2572 unregister_filesystem(&reiserfs_fs_type);
2573 destroy_inodecache();
2574 }
2575
2576 struct file_system_type reiserfs_fs_type = {
2577 .owner = THIS_MODULE,
2578 .name = "reiserfs",
2579 .mount = get_super_block,
2580 .kill_sb = reiserfs_kill_sb,
2581 .fs_flags = FS_REQUIRES_DEV,
2582 };
2583 MODULE_ALIAS_FS("reiserfs");
2584
2585 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2586 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2587 MODULE_LICENSE("GPL");
2588
2589 module_init(init_reiserfs_fs);
2590 module_exit(exit_reiserfs_fs);
2591