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 (!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(REISERFS_SB(s)->s_jdev);
603 kfree(s->s_fs_info);
604 s->s_fs_info = NULL;
605 }
606
607 static struct kmem_cache *reiserfs_inode_cachep;
608
reiserfs_alloc_inode(struct super_block * sb)609 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
610 {
611 struct reiserfs_inode_info *ei;
612 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
613 if (!ei)
614 return NULL;
615 atomic_set(&ei->openers, 0);
616 mutex_init(&ei->tailpack);
617 #ifdef CONFIG_QUOTA
618 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
619 #endif
620
621 return &ei->vfs_inode;
622 }
623
reiserfs_i_callback(struct rcu_head * head)624 static void reiserfs_i_callback(struct rcu_head *head)
625 {
626 struct inode *inode = container_of(head, struct inode, i_rcu);
627 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
628 }
629
reiserfs_destroy_inode(struct inode * inode)630 static void reiserfs_destroy_inode(struct inode *inode)
631 {
632 call_rcu(&inode->i_rcu, reiserfs_i_callback);
633 }
634
init_once(void * foo)635 static void init_once(void *foo)
636 {
637 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
638
639 INIT_LIST_HEAD(&ei->i_prealloc_list);
640 inode_init_once(&ei->vfs_inode);
641 }
642
init_inodecache(void)643 static int __init init_inodecache(void)
644 {
645 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
646 sizeof(struct
647 reiserfs_inode_info),
648 0, (SLAB_RECLAIM_ACCOUNT|
649 SLAB_MEM_SPREAD),
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 };
825
826 static const struct quotactl_ops reiserfs_qctl_operations = {
827 .quota_on = reiserfs_quota_on,
828 .quota_off = dquot_quota_off,
829 .quota_sync = dquot_quota_sync,
830 .get_state = dquot_get_state,
831 .set_info = dquot_set_dqinfo,
832 .get_dqblk = dquot_get_dqblk,
833 .set_dqblk = dquot_set_dqblk,
834 };
835 #endif
836
837 static const struct export_operations reiserfs_export_ops = {
838 .encode_fh = reiserfs_encode_fh,
839 .fh_to_dentry = reiserfs_fh_to_dentry,
840 .fh_to_parent = reiserfs_fh_to_parent,
841 .get_parent = reiserfs_get_parent,
842 };
843
844 /*
845 * this struct is used in reiserfs_getopt () for containing the value for
846 * those mount options that have values rather than being toggles.
847 */
848 typedef struct {
849 char *value;
850 /*
851 * bitmask which is to set on mount_options bitmask
852 * when this value is found, 0 is no bits are to be changed.
853 */
854 int setmask;
855 /*
856 * bitmask which is to clear on mount_options bitmask
857 * when this value is found, 0 is no bits are to be changed.
858 * This is applied BEFORE setmask
859 */
860 int clrmask;
861 } arg_desc_t;
862
863 /* Set this bit in arg_required to allow empty arguments */
864 #define REISERFS_OPT_ALLOWEMPTY 31
865
866 /*
867 * this struct is used in reiserfs_getopt() for describing the
868 * set of reiserfs mount options
869 */
870 typedef struct {
871 char *option_name;
872
873 /* 0 if argument is not required, not 0 otherwise */
874 int arg_required;
875
876 /* list of values accepted by an option */
877 const arg_desc_t *values;
878
879 /*
880 * bitmask which is to set on mount_options bitmask
881 * when this value is found, 0 is no bits are to be changed.
882 */
883 int setmask;
884
885 /*
886 * bitmask which is to clear on mount_options bitmask
887 * when this value is found, 0 is no bits are to be changed.
888 * This is applied BEFORE setmask
889 */
890 int clrmask;
891 } opt_desc_t;
892
893 /* possible values for -o data= */
894 static const arg_desc_t logging_mode[] = {
895 {"ordered", 1 << REISERFS_DATA_ORDERED,
896 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
897 {"journal", 1 << REISERFS_DATA_LOG,
898 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
899 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
900 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
901 {.value = NULL}
902 };
903
904 /* possible values for -o barrier= */
905 static const arg_desc_t barrier_mode[] = {
906 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
907 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
908 {.value = NULL}
909 };
910
911 /*
912 * possible values for "-o block-allocator=" and bits which are to be set in
913 * s_mount_opt of reiserfs specific part of in-core super block
914 */
915 static const arg_desc_t balloc[] = {
916 {"noborder", 1 << REISERFS_NO_BORDER, 0},
917 {"border", 0, 1 << REISERFS_NO_BORDER},
918 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
919 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
920 {"test4", 1 << REISERFS_TEST4, 0},
921 {"notest4", 0, 1 << REISERFS_TEST4},
922 {NULL, 0, 0}
923 };
924
925 static const arg_desc_t tails[] = {
926 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
927 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
928 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
929 {NULL, 0, 0}
930 };
931
932 static const arg_desc_t error_actions[] = {
933 {"panic", 1 << REISERFS_ERROR_PANIC,
934 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
935 {"ro-remount", 1 << REISERFS_ERROR_RO,
936 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
937 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
938 {"continue", 1 << REISERFS_ERROR_CONTINUE,
939 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
940 #endif
941 {NULL, 0, 0},
942 };
943
944 /*
945 * proceed only one option from a list *cur - string containing of mount
946 * options
947 * opts - array of options which are accepted
948 * opt_arg - if option is found and requires an argument and if it is specifed
949 * in the input - pointer to the argument is stored here
950 * bit_flags - if option requires to set a certain bit - it is set here
951 * return -1 if unknown option is found, opt->arg_required otherwise
952 */
reiserfs_getopt(struct super_block * s,char ** cur,opt_desc_t * opts,char ** opt_arg,unsigned long * bit_flags)953 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
954 char **opt_arg, unsigned long *bit_flags)
955 {
956 char *p;
957 /*
958 * foo=bar,
959 * ^ ^ ^
960 * | | +-- option_end
961 * | +-- arg_start
962 * +-- option_start
963 */
964 const opt_desc_t *opt;
965 const arg_desc_t *arg;
966
967 p = *cur;
968
969 /* assume argument cannot contain commas */
970 *cur = strchr(p, ',');
971 if (*cur) {
972 *(*cur) = '\0';
973 (*cur)++;
974 }
975
976 if (!strncmp(p, "alloc=", 6)) {
977 /*
978 * Ugly special case, probably we should redo options
979 * parser so that it can understand several arguments for
980 * some options, also so that it can fill several bitfields
981 * with option values.
982 */
983 if (reiserfs_parse_alloc_options(s, p + 6)) {
984 return -1;
985 } else {
986 return 0;
987 }
988 }
989
990 /* for every option in the list */
991 for (opt = opts; opt->option_name; opt++) {
992 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
993 if (bit_flags) {
994 if (opt->clrmask ==
995 (1 << REISERFS_UNSUPPORTED_OPT))
996 reiserfs_warning(s, "super-6500",
997 "%s not supported.\n",
998 p);
999 else
1000 *bit_flags &= ~opt->clrmask;
1001 if (opt->setmask ==
1002 (1 << REISERFS_UNSUPPORTED_OPT))
1003 reiserfs_warning(s, "super-6501",
1004 "%s not supported.\n",
1005 p);
1006 else
1007 *bit_flags |= opt->setmask;
1008 }
1009 break;
1010 }
1011 }
1012 if (!opt->option_name) {
1013 reiserfs_warning(s, "super-6502",
1014 "unknown mount option \"%s\"", p);
1015 return -1;
1016 }
1017
1018 p += strlen(opt->option_name);
1019 switch (*p) {
1020 case '=':
1021 if (!opt->arg_required) {
1022 reiserfs_warning(s, "super-6503",
1023 "the option \"%s\" does not "
1024 "require an argument\n",
1025 opt->option_name);
1026 return -1;
1027 }
1028 break;
1029
1030 case 0:
1031 if (opt->arg_required) {
1032 reiserfs_warning(s, "super-6504",
1033 "the option \"%s\" requires an "
1034 "argument\n", opt->option_name);
1035 return -1;
1036 }
1037 break;
1038 default:
1039 reiserfs_warning(s, "super-6505",
1040 "head of option \"%s\" is only correct\n",
1041 opt->option_name);
1042 return -1;
1043 }
1044
1045 /*
1046 * move to the argument, or to next option if argument is not
1047 * required
1048 */
1049 p++;
1050
1051 if (opt->arg_required
1052 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1053 && !strlen(p)) {
1054 /* this catches "option=," if not allowed */
1055 reiserfs_warning(s, "super-6506",
1056 "empty argument for \"%s\"\n",
1057 opt->option_name);
1058 return -1;
1059 }
1060
1061 if (!opt->values) {
1062 /* *=NULLopt_arg contains pointer to argument */
1063 *opt_arg = p;
1064 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1065 }
1066
1067 /* values possible for this option are listed in opt->values */
1068 for (arg = opt->values; arg->value; arg++) {
1069 if (!strcmp(p, arg->value)) {
1070 if (bit_flags) {
1071 *bit_flags &= ~arg->clrmask;
1072 *bit_flags |= arg->setmask;
1073 }
1074 return opt->arg_required;
1075 }
1076 }
1077
1078 reiserfs_warning(s, "super-6506",
1079 "bad value \"%s\" for option \"%s\"\n", p,
1080 opt->option_name);
1081 return -1;
1082 }
1083
1084 /* 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)1085 static int reiserfs_parse_options(struct super_block *s,
1086
1087 /* string given via mount's -o */
1088 char *options,
1089
1090 /*
1091 * after the parsing phase, contains the
1092 * collection of bitflags defining what
1093 * mount options were selected.
1094 */
1095 unsigned long *mount_options,
1096
1097 /* strtol-ed from NNN of resize=NNN */
1098 unsigned long *blocks,
1099 char **jdev_name,
1100 unsigned int *commit_max_age,
1101 char **qf_names,
1102 unsigned int *qfmt)
1103 {
1104 int c;
1105 char *arg = NULL;
1106 char *pos;
1107 opt_desc_t opts[] = {
1108 /*
1109 * Compatibility stuff, so that -o notail for old
1110 * setups still work
1111 */
1112 {"tails",.arg_required = 't',.values = tails},
1113 {"notail",.clrmask =
1114 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1115 {"conv",.setmask = 1 << REISERFS_CONVERT},
1116 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1117 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1118 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1119 #ifdef CONFIG_REISERFS_FS_XATTR
1120 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1121 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1122 #else
1123 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1124 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1125 #endif
1126 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1127 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1128 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1129 #else
1130 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1131 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1132 #endif
1133 {.option_name = "nolog"},
1134 {"replayonly",.setmask = 1 << REPLAYONLY},
1135 {"block-allocator",.arg_required = 'a',.values = balloc},
1136 {"data",.arg_required = 'd',.values = logging_mode},
1137 {"barrier",.arg_required = 'b',.values = barrier_mode},
1138 {"resize",.arg_required = 'r',.values = NULL},
1139 {"jdev",.arg_required = 'j',.values = NULL},
1140 {"nolargeio",.arg_required = 'w',.values = NULL},
1141 {"commit",.arg_required = 'c',.values = NULL},
1142 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1143 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1144 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1145 {"errors",.arg_required = 'e',.values = error_actions},
1146 {"usrjquota",.arg_required =
1147 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1148 {"grpjquota",.arg_required =
1149 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1150 {"jqfmt",.arg_required = 'f',.values = NULL},
1151 {.option_name = NULL}
1152 };
1153
1154 *blocks = 0;
1155 if (!options || !*options)
1156 /*
1157 * use default configuration: create tails, journaling on, no
1158 * conversion to newest format
1159 */
1160 return 1;
1161
1162 for (pos = options; pos;) {
1163 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1164 if (c == -1)
1165 /* wrong option is given */
1166 return 0;
1167
1168 if (c == 'r') {
1169 char *p;
1170
1171 p = NULL;
1172 /* "resize=NNN" or "resize=auto" */
1173
1174 if (!strcmp(arg, "auto")) {
1175 /* From JFS code, to auto-get the size. */
1176 *blocks =
1177 s->s_bdev->bd_inode->i_size >> s->
1178 s_blocksize_bits;
1179 } else {
1180 *blocks = simple_strtoul(arg, &p, 0);
1181 if (*p != '\0') {
1182 /* NNN does not look like a number */
1183 reiserfs_warning(s, "super-6507",
1184 "bad value %s for "
1185 "-oresize\n", arg);
1186 return 0;
1187 }
1188 }
1189 }
1190
1191 if (c == 'c') {
1192 char *p = NULL;
1193 unsigned long val = simple_strtoul(arg, &p, 0);
1194 /* commit=NNN (time in seconds) */
1195 if (*p != '\0' || val >= (unsigned int)-1) {
1196 reiserfs_warning(s, "super-6508",
1197 "bad value %s for -ocommit\n",
1198 arg);
1199 return 0;
1200 }
1201 *commit_max_age = (unsigned int)val;
1202 }
1203
1204 if (c == 'w') {
1205 reiserfs_warning(s, "super-6509", "nolargeio option "
1206 "is no longer supported");
1207 return 0;
1208 }
1209
1210 if (c == 'j') {
1211 if (arg && *arg && jdev_name) {
1212 /* Hm, already assigned? */
1213 if (*jdev_name) {
1214 reiserfs_warning(s, "super-6510",
1215 "journal device was "
1216 "already specified to "
1217 "be %s", *jdev_name);
1218 return 0;
1219 }
1220 *jdev_name = arg;
1221 }
1222 }
1223 #ifdef CONFIG_QUOTA
1224 if (c == 'u' || c == 'g') {
1225 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1226
1227 if (sb_any_quota_loaded(s) &&
1228 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1229 reiserfs_warning(s, "super-6511",
1230 "cannot change journaled "
1231 "quota options when quota "
1232 "turned on.");
1233 return 0;
1234 }
1235 if (qf_names[qtype] !=
1236 REISERFS_SB(s)->s_qf_names[qtype])
1237 kfree(qf_names[qtype]);
1238 qf_names[qtype] = NULL;
1239 if (*arg) { /* Some filename specified? */
1240 if (REISERFS_SB(s)->s_qf_names[qtype]
1241 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1242 arg)) {
1243 reiserfs_warning(s, "super-6512",
1244 "%s quota file "
1245 "already specified.",
1246 QTYPE2NAME(qtype));
1247 return 0;
1248 }
1249 if (strchr(arg, '/')) {
1250 reiserfs_warning(s, "super-6513",
1251 "quotafile must be "
1252 "on filesystem root.");
1253 return 0;
1254 }
1255 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1256 if (!qf_names[qtype]) {
1257 reiserfs_warning(s, "reiserfs-2502",
1258 "not enough memory "
1259 "for storing "
1260 "quotafile name.");
1261 return 0;
1262 }
1263 if (qtype == USRQUOTA)
1264 *mount_options |= 1 << REISERFS_USRQUOTA;
1265 else
1266 *mount_options |= 1 << REISERFS_GRPQUOTA;
1267 } else {
1268 if (qtype == USRQUOTA)
1269 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1270 else
1271 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1272 }
1273 }
1274 if (c == 'f') {
1275 if (!strcmp(arg, "vfsold"))
1276 *qfmt = QFMT_VFS_OLD;
1277 else if (!strcmp(arg, "vfsv0"))
1278 *qfmt = QFMT_VFS_V0;
1279 else {
1280 reiserfs_warning(s, "super-6514",
1281 "unknown quota format "
1282 "specified.");
1283 return 0;
1284 }
1285 if (sb_any_quota_loaded(s) &&
1286 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1287 reiserfs_warning(s, "super-6515",
1288 "cannot change journaled "
1289 "quota options when quota "
1290 "turned on.");
1291 return 0;
1292 }
1293 }
1294 #else
1295 if (c == 'u' || c == 'g' || c == 'f') {
1296 reiserfs_warning(s, "reiserfs-2503", "journaled "
1297 "quota options not supported.");
1298 return 0;
1299 }
1300 #endif
1301 }
1302
1303 #ifdef CONFIG_QUOTA
1304 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1305 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1306 reiserfs_warning(s, "super-6515",
1307 "journaled quota format not specified.");
1308 return 0;
1309 }
1310 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1311 sb_has_quota_loaded(s, USRQUOTA)) ||
1312 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1313 sb_has_quota_loaded(s, GRPQUOTA))) {
1314 reiserfs_warning(s, "super-6516", "quota options must "
1315 "be present when quota is turned on.");
1316 return 0;
1317 }
1318 #endif
1319
1320 return 1;
1321 }
1322
switch_data_mode(struct super_block * s,unsigned long mode)1323 static void switch_data_mode(struct super_block *s, unsigned long mode)
1324 {
1325 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1326 (1 << REISERFS_DATA_ORDERED) |
1327 (1 << REISERFS_DATA_WRITEBACK));
1328 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1329 }
1330
handle_data_mode(struct super_block * s,unsigned long mount_options)1331 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1332 {
1333 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1334 if (!reiserfs_data_log(s)) {
1335 switch_data_mode(s, REISERFS_DATA_LOG);
1336 reiserfs_info(s, "switching to journaled data mode\n");
1337 }
1338 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1339 if (!reiserfs_data_ordered(s)) {
1340 switch_data_mode(s, REISERFS_DATA_ORDERED);
1341 reiserfs_info(s, "switching to ordered data mode\n");
1342 }
1343 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1344 if (!reiserfs_data_writeback(s)) {
1345 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1346 reiserfs_info(s, "switching to writeback data mode\n");
1347 }
1348 }
1349 }
1350
handle_barrier_mode(struct super_block * s,unsigned long bits)1351 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1352 {
1353 int flush = (1 << REISERFS_BARRIER_FLUSH);
1354 int none = (1 << REISERFS_BARRIER_NONE);
1355 int all_barrier = flush | none;
1356
1357 if (bits & all_barrier) {
1358 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1359 if (bits & flush) {
1360 REISERFS_SB(s)->s_mount_opt |= flush;
1361 printk("reiserfs: enabling write barrier flush mode\n");
1362 } else if (bits & none) {
1363 REISERFS_SB(s)->s_mount_opt |= none;
1364 printk("reiserfs: write barriers turned off\n");
1365 }
1366 }
1367 }
1368
handle_attrs(struct super_block * s)1369 static void handle_attrs(struct super_block *s)
1370 {
1371 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1372
1373 if (reiserfs_attrs(s)) {
1374 if (old_format_only(s)) {
1375 reiserfs_warning(s, "super-6517", "cannot support "
1376 "attributes on 3.5.x disk format");
1377 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1378 return;
1379 }
1380 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1381 reiserfs_warning(s, "super-6518", "cannot support "
1382 "attributes until flag is set in "
1383 "super-block");
1384 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1385 }
1386 }
1387 }
1388
1389 #ifdef CONFIG_QUOTA
handle_quota_files(struct super_block * s,char ** qf_names,unsigned int * qfmt)1390 static void handle_quota_files(struct super_block *s, char **qf_names,
1391 unsigned int *qfmt)
1392 {
1393 int i;
1394
1395 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1396 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1397 kfree(REISERFS_SB(s)->s_qf_names[i]);
1398 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1399 }
1400 if (*qfmt)
1401 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1402 }
1403 #endif
1404
reiserfs_remount(struct super_block * s,int * mount_flags,char * arg)1405 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1406 {
1407 struct reiserfs_super_block *rs;
1408 struct reiserfs_transaction_handle th;
1409 unsigned long blocks;
1410 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1411 unsigned long safe_mask = 0;
1412 unsigned int commit_max_age = (unsigned int)-1;
1413 struct reiserfs_journal *journal = SB_JOURNAL(s);
1414 char *new_opts = kstrdup(arg, GFP_KERNEL);
1415 int err;
1416 char *qf_names[REISERFS_MAXQUOTAS];
1417 unsigned int qfmt = 0;
1418 #ifdef CONFIG_QUOTA
1419 int i;
1420 #endif
1421
1422 sync_filesystem(s);
1423 reiserfs_write_lock(s);
1424
1425 #ifdef CONFIG_QUOTA
1426 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1427 #endif
1428
1429 rs = SB_DISK_SUPER_BLOCK(s);
1430
1431 if (!reiserfs_parse_options
1432 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1433 qf_names, &qfmt)) {
1434 #ifdef CONFIG_QUOTA
1435 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1436 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1437 kfree(qf_names[i]);
1438 #endif
1439 err = -EINVAL;
1440 goto out_err_unlock;
1441 }
1442 #ifdef CONFIG_QUOTA
1443 handle_quota_files(s, qf_names, &qfmt);
1444 #endif
1445
1446 handle_attrs(s);
1447
1448 /* Add options that are safe here */
1449 safe_mask |= 1 << REISERFS_SMALLTAIL;
1450 safe_mask |= 1 << REISERFS_LARGETAIL;
1451 safe_mask |= 1 << REISERFS_NO_BORDER;
1452 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1453 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1454 safe_mask |= 1 << REISERFS_TEST4;
1455 safe_mask |= 1 << REISERFS_ATTRS;
1456 safe_mask |= 1 << REISERFS_XATTRS_USER;
1457 safe_mask |= 1 << REISERFS_POSIXACL;
1458 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1459 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1460 safe_mask |= 1 << REISERFS_ERROR_RO;
1461 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1462 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1463 safe_mask |= 1 << REISERFS_USRQUOTA;
1464 safe_mask |= 1 << REISERFS_GRPQUOTA;
1465
1466 /*
1467 * Update the bitmask, taking care to keep
1468 * the bits we're not allowed to change here
1469 */
1470 REISERFS_SB(s)->s_mount_opt =
1471 (REISERFS_SB(s)->
1472 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1473
1474 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1475 journal->j_max_commit_age = commit_max_age;
1476 journal->j_max_trans_age = commit_max_age;
1477 } else if (commit_max_age == 0) {
1478 /* 0 means restore defaults. */
1479 journal->j_max_commit_age = journal->j_default_max_commit_age;
1480 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1481 }
1482
1483 if (blocks) {
1484 err = reiserfs_resize(s, blocks);
1485 if (err != 0)
1486 goto out_err_unlock;
1487 }
1488
1489 if (*mount_flags & MS_RDONLY) {
1490 reiserfs_write_unlock(s);
1491 reiserfs_xattr_init(s, *mount_flags);
1492 /* remount read-only */
1493 if (s->s_flags & MS_RDONLY)
1494 /* it is read-only already */
1495 goto out_ok_unlocked;
1496
1497 err = dquot_suspend(s, -1);
1498 if (err < 0)
1499 goto out_err;
1500
1501 /* try to remount file system with read-only permissions */
1502 if (sb_umount_state(rs) == REISERFS_VALID_FS
1503 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1504 goto out_ok_unlocked;
1505 }
1506
1507 reiserfs_write_lock(s);
1508
1509 err = journal_begin(&th, s, 10);
1510 if (err)
1511 goto out_err_unlock;
1512
1513 /* Mounting a rw partition read-only. */
1514 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1515 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1516 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1517 } else {
1518 /* remount read-write */
1519 if (!(s->s_flags & MS_RDONLY)) {
1520 reiserfs_write_unlock(s);
1521 reiserfs_xattr_init(s, *mount_flags);
1522 goto out_ok_unlocked; /* We are read-write already */
1523 }
1524
1525 if (reiserfs_is_journal_aborted(journal)) {
1526 err = journal->j_errno;
1527 goto out_err_unlock;
1528 }
1529
1530 handle_data_mode(s, mount_options);
1531 handle_barrier_mode(s, mount_options);
1532 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1533
1534 /* now it is safe to call journal_begin */
1535 s->s_flags &= ~MS_RDONLY;
1536 err = journal_begin(&th, s, 10);
1537 if (err)
1538 goto out_err_unlock;
1539
1540 /* Mount a partition which is read-only, read-write */
1541 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1542 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1543 s->s_flags &= ~MS_RDONLY;
1544 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1545 if (!old_format_only(s))
1546 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1547 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1548 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1549 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1550 }
1551 /* this will force a full flush of all journal lists */
1552 SB_JOURNAL(s)->j_must_wait = 1;
1553 err = journal_end(&th);
1554 if (err)
1555 goto out_err_unlock;
1556
1557 reiserfs_write_unlock(s);
1558 if (!(*mount_flags & MS_RDONLY)) {
1559 dquot_resume(s, -1);
1560 reiserfs_write_lock(s);
1561 finish_unfinished(s);
1562 reiserfs_write_unlock(s);
1563 reiserfs_xattr_init(s, *mount_flags);
1564 }
1565
1566 out_ok_unlocked:
1567 replace_mount_options(s, new_opts);
1568 return 0;
1569
1570 out_err_unlock:
1571 reiserfs_write_unlock(s);
1572 out_err:
1573 kfree(new_opts);
1574 return err;
1575 }
1576
read_super_block(struct super_block * s,int offset)1577 static int read_super_block(struct super_block *s, int offset)
1578 {
1579 struct buffer_head *bh;
1580 struct reiserfs_super_block *rs;
1581 int fs_blocksize;
1582
1583 bh = sb_bread(s, offset / s->s_blocksize);
1584 if (!bh) {
1585 reiserfs_warning(s, "sh-2006",
1586 "bread failed (dev %s, block %lu, size %lu)",
1587 s->s_id, offset / s->s_blocksize,
1588 s->s_blocksize);
1589 return 1;
1590 }
1591
1592 rs = (struct reiserfs_super_block *)bh->b_data;
1593 if (!is_any_reiserfs_magic_string(rs)) {
1594 brelse(bh);
1595 return 1;
1596 }
1597 /*
1598 * ok, reiserfs signature (old or new) found in at the given offset
1599 */
1600 fs_blocksize = sb_blocksize(rs);
1601 brelse(bh);
1602 sb_set_blocksize(s, fs_blocksize);
1603
1604 bh = sb_bread(s, offset / s->s_blocksize);
1605 if (!bh) {
1606 reiserfs_warning(s, "sh-2007",
1607 "bread failed (dev %s, block %lu, size %lu)",
1608 s->s_id, offset / s->s_blocksize,
1609 s->s_blocksize);
1610 return 1;
1611 }
1612
1613 rs = (struct reiserfs_super_block *)bh->b_data;
1614 if (sb_blocksize(rs) != s->s_blocksize) {
1615 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1616 "filesystem on (dev %s, block %llu, size %lu)",
1617 s->s_id,
1618 (unsigned long long)bh->b_blocknr,
1619 s->s_blocksize);
1620 brelse(bh);
1621 return 1;
1622 }
1623
1624 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1625 brelse(bh);
1626 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1627 "--rebuild-tree run detected. Please run\n"
1628 "reiserfsck --rebuild-tree and wait for a "
1629 "completion. If that fails\n"
1630 "get newer reiserfsprogs package");
1631 return 1;
1632 }
1633
1634 SB_BUFFER_WITH_SB(s) = bh;
1635 SB_DISK_SUPER_BLOCK(s) = rs;
1636
1637 /*
1638 * magic is of non-standard journal filesystem, look at s_version to
1639 * find which format is in use
1640 */
1641 if (is_reiserfs_jr(rs)) {
1642 if (sb_version(rs) == REISERFS_VERSION_2)
1643 reiserfs_info(s, "found reiserfs format \"3.6\""
1644 " with non-standard journal\n");
1645 else if (sb_version(rs) == REISERFS_VERSION_1)
1646 reiserfs_info(s, "found reiserfs format \"3.5\""
1647 " with non-standard journal\n");
1648 else {
1649 reiserfs_warning(s, "sh-2012", "found unknown "
1650 "format \"%u\" of reiserfs with "
1651 "non-standard magic", sb_version(rs));
1652 return 1;
1653 }
1654 } else
1655 /*
1656 * s_version of standard format may contain incorrect
1657 * information, so we just look at the magic string
1658 */
1659 reiserfs_info(s,
1660 "found reiserfs format \"%s\" with standard journal\n",
1661 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1662
1663 s->s_op = &reiserfs_sops;
1664 s->s_export_op = &reiserfs_export_ops;
1665 #ifdef CONFIG_QUOTA
1666 s->s_qcop = &reiserfs_qctl_operations;
1667 s->dq_op = &reiserfs_quota_operations;
1668 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1669 #endif
1670
1671 /*
1672 * new format is limited by the 32 bit wide i_blocks field, want to
1673 * be one full block below that.
1674 */
1675 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1676 return 0;
1677 }
1678
1679 /* after journal replay, reread all bitmap and super blocks */
reread_meta_blocks(struct super_block * s)1680 static int reread_meta_blocks(struct super_block *s)
1681 {
1682 ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1683 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1684 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1685 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1686 return 1;
1687 }
1688
1689 return 0;
1690 }
1691
1692 /* hash detection stuff */
1693
1694 /*
1695 * if root directory is empty - we set default - Yura's - hash and
1696 * warn about it
1697 * FIXME: we look for only one name in a directory. If tea and yura
1698 * both have the same value - we ask user to send report to the
1699 * mailing list
1700 */
find_hash_out(struct super_block * s)1701 static __u32 find_hash_out(struct super_block *s)
1702 {
1703 int retval;
1704 struct inode *inode;
1705 struct cpu_key key;
1706 INITIALIZE_PATH(path);
1707 struct reiserfs_dir_entry de;
1708 struct reiserfs_de_head *deh;
1709 __u32 hash = DEFAULT_HASH;
1710 __u32 deh_hashval, teahash, r5hash, yurahash;
1711
1712 inode = d_inode(s->s_root);
1713
1714 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1715 retval = search_by_entry_key(s, &key, &path, &de);
1716 if (retval == IO_ERROR) {
1717 pathrelse(&path);
1718 return UNSET_HASH;
1719 }
1720 if (retval == NAME_NOT_FOUND)
1721 de.de_entry_num--;
1722
1723 set_de_name_and_namelen(&de);
1724 deh = de.de_deh + de.de_entry_num;
1725
1726 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1727 /* allow override in this case */
1728 if (reiserfs_rupasov_hash(s))
1729 hash = YURA_HASH;
1730 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1731 goto out;
1732 }
1733
1734 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1735 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1736 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1737 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1738
1739 if ((teahash == r5hash && deh_hashval == r5hash) ||
1740 (teahash == yurahash && deh_hashval == yurahash) ||
1741 (r5hash == yurahash && deh_hashval == yurahash)) {
1742 reiserfs_warning(s, "reiserfs-2506",
1743 "Unable to automatically detect hash "
1744 "function. Please mount with -o "
1745 "hash={tea,rupasov,r5}");
1746 hash = UNSET_HASH;
1747 goto out;
1748 }
1749
1750 if (deh_hashval == yurahash)
1751 hash = YURA_HASH;
1752 else if (deh_hashval == teahash)
1753 hash = TEA_HASH;
1754 else if (deh_hashval == r5hash)
1755 hash = R5_HASH;
1756 else {
1757 reiserfs_warning(s, "reiserfs-2506",
1758 "Unrecognised hash function");
1759 hash = UNSET_HASH;
1760 }
1761 out:
1762 pathrelse(&path);
1763 return hash;
1764 }
1765
1766 /* finds out which hash names are sorted with */
what_hash(struct super_block * s)1767 static int what_hash(struct super_block *s)
1768 {
1769 __u32 code;
1770
1771 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1772
1773 /*
1774 * reiserfs_hash_detect() == true if any of the hash mount options
1775 * were used. We must check them to make sure the user isn't
1776 * using a bad hash value
1777 */
1778 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1779 code = find_hash_out(s);
1780
1781 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1782 /*
1783 * detection has found the hash, and we must check against the
1784 * mount options
1785 */
1786 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1787 reiserfs_warning(s, "reiserfs-2507",
1788 "Error, %s hash detected, "
1789 "unable to force rupasov hash",
1790 reiserfs_hashname(code));
1791 code = UNSET_HASH;
1792 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1793 reiserfs_warning(s, "reiserfs-2508",
1794 "Error, %s hash detected, "
1795 "unable to force tea hash",
1796 reiserfs_hashname(code));
1797 code = UNSET_HASH;
1798 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1799 reiserfs_warning(s, "reiserfs-2509",
1800 "Error, %s hash detected, "
1801 "unable to force r5 hash",
1802 reiserfs_hashname(code));
1803 code = UNSET_HASH;
1804 }
1805 } else {
1806 /*
1807 * find_hash_out was not called or
1808 * could not determine the hash
1809 */
1810 if (reiserfs_rupasov_hash(s)) {
1811 code = YURA_HASH;
1812 } else if (reiserfs_tea_hash(s)) {
1813 code = TEA_HASH;
1814 } else if (reiserfs_r5_hash(s)) {
1815 code = R5_HASH;
1816 }
1817 }
1818
1819 /*
1820 * if we are mounted RW, and we have a new valid hash code, update
1821 * the super
1822 */
1823 if (code != UNSET_HASH &&
1824 !(s->s_flags & MS_RDONLY) &&
1825 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1826 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1827 }
1828 return code;
1829 }
1830
1831 /* return pointer to appropriate function */
hash_function(struct super_block * s)1832 static hashf_t hash_function(struct super_block *s)
1833 {
1834 switch (what_hash(s)) {
1835 case TEA_HASH:
1836 reiserfs_info(s, "Using tea hash to sort names\n");
1837 return keyed_hash;
1838 case YURA_HASH:
1839 reiserfs_info(s, "Using rupasov hash to sort names\n");
1840 return yura_hash;
1841 case R5_HASH:
1842 reiserfs_info(s, "Using r5 hash to sort names\n");
1843 return r5_hash;
1844 }
1845 return NULL;
1846 }
1847
1848 /* this is used to set up correct value for old partitions */
function2code(hashf_t func)1849 static int function2code(hashf_t func)
1850 {
1851 if (func == keyed_hash)
1852 return TEA_HASH;
1853 if (func == yura_hash)
1854 return YURA_HASH;
1855 if (func == r5_hash)
1856 return R5_HASH;
1857
1858 BUG(); /* should never happen */
1859
1860 return 0;
1861 }
1862
1863 #define SWARN(silent, s, id, ...) \
1864 if (!(silent)) \
1865 reiserfs_warning(s, id, __VA_ARGS__)
1866
reiserfs_fill_super(struct super_block * s,void * data,int silent)1867 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1868 {
1869 struct inode *root_inode;
1870 struct reiserfs_transaction_handle th;
1871 int old_format = 0;
1872 unsigned long blocks;
1873 unsigned int commit_max_age = 0;
1874 int jinit_done = 0;
1875 struct reiserfs_iget_args args;
1876 struct reiserfs_super_block *rs;
1877 char *jdev_name;
1878 struct reiserfs_sb_info *sbi;
1879 int errval = -EINVAL;
1880 char *qf_names[REISERFS_MAXQUOTAS] = {};
1881 unsigned int qfmt = 0;
1882
1883 save_mount_options(s, data);
1884
1885 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1886 if (!sbi)
1887 return -ENOMEM;
1888 s->s_fs_info = sbi;
1889 /* Set default values for options: non-aggressive tails, RO on errors */
1890 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1891 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1892 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1893 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1894 sbi->s_alloc_options.preallocmin = 0;
1895 /* Preallocate by 16 blocks (17-1) at once */
1896 sbi->s_alloc_options.preallocsize = 17;
1897 /* setup default block allocator options */
1898 reiserfs_init_alloc_options(s);
1899
1900 spin_lock_init(&sbi->old_work_lock);
1901 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1902 mutex_init(&sbi->lock);
1903 sbi->lock_depth = -1;
1904
1905 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1906 s->s_id);
1907 if (!sbi->commit_wq) {
1908 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1909 errval = -ENOMEM;
1910 goto error_unlocked;
1911 }
1912
1913 jdev_name = NULL;
1914 if (reiserfs_parse_options
1915 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1916 &commit_max_age, qf_names, &qfmt) == 0) {
1917 goto error_unlocked;
1918 }
1919 if (jdev_name && jdev_name[0]) {
1920 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1921 if (!sbi->s_jdev) {
1922 SWARN(silent, s, "", "Cannot allocate memory for "
1923 "journal device name");
1924 goto error_unlocked;
1925 }
1926 }
1927 #ifdef CONFIG_QUOTA
1928 handle_quota_files(s, qf_names, &qfmt);
1929 #endif
1930
1931 if (blocks) {
1932 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1933 goto error_unlocked;
1934 }
1935
1936 /*
1937 * try old format (undistributed bitmap, super block in 8-th 1k
1938 * block of a device)
1939 */
1940 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1941 old_format = 1;
1942
1943 /*
1944 * try new format (64-th 1k block), which can contain reiserfs
1945 * super block
1946 */
1947 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1948 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1949 s->s_id);
1950 goto error_unlocked;
1951 }
1952
1953 rs = SB_DISK_SUPER_BLOCK(s);
1954 /*
1955 * Let's do basic sanity check to verify that underlying device is not
1956 * smaller than the filesystem. If the check fails then abort and
1957 * scream, because bad stuff will happen otherwise.
1958 */
1959 if (s->s_bdev && s->s_bdev->bd_inode
1960 && i_size_read(s->s_bdev->bd_inode) <
1961 sb_block_count(rs) * sb_blocksize(rs)) {
1962 SWARN(silent, s, "", "Filesystem cannot be "
1963 "mounted because it is bigger than the device");
1964 SWARN(silent, s, "", "You may need to run fsck "
1965 "or increase size of your LVM partition");
1966 SWARN(silent, s, "", "Or may be you forgot to "
1967 "reboot after fdisk when it told you to");
1968 goto error_unlocked;
1969 }
1970
1971 sbi->s_mount_state = SB_REISERFS_STATE(s);
1972 sbi->s_mount_state = REISERFS_VALID_FS;
1973
1974 if ((errval = reiserfs_init_bitmap_cache(s))) {
1975 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1976 goto error_unlocked;
1977 }
1978
1979 errval = -EINVAL;
1980 #ifdef CONFIG_REISERFS_CHECK
1981 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1982 SWARN(silent, s, "", "- it is slow mode for debugging.");
1983 #endif
1984
1985 /* make data=ordered the default */
1986 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1987 !reiserfs_data_writeback(s)) {
1988 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1989 }
1990
1991 if (reiserfs_data_log(s)) {
1992 reiserfs_info(s, "using journaled data mode\n");
1993 } else if (reiserfs_data_ordered(s)) {
1994 reiserfs_info(s, "using ordered data mode\n");
1995 } else {
1996 reiserfs_info(s, "using writeback data mode\n");
1997 }
1998 if (reiserfs_barrier_flush(s)) {
1999 printk("reiserfs: using flush barriers\n");
2000 }
2001
2002 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2003 SWARN(silent, s, "sh-2022",
2004 "unable to initialize journal space");
2005 goto error_unlocked;
2006 } else {
2007 /*
2008 * once this is set, journal_release must be called
2009 * if we error out of the mount
2010 */
2011 jinit_done = 1;
2012 }
2013
2014 if (reread_meta_blocks(s)) {
2015 SWARN(silent, s, "jmacd-9",
2016 "unable to reread meta blocks after journal init");
2017 goto error_unlocked;
2018 }
2019
2020 if (replay_only(s))
2021 goto error_unlocked;
2022
2023 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
2024 SWARN(silent, s, "clm-7000",
2025 "Detected readonly device, marking FS readonly");
2026 s->s_flags |= MS_RDONLY;
2027 }
2028 args.objectid = REISERFS_ROOT_OBJECTID;
2029 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2030 root_inode =
2031 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2032 reiserfs_init_locked_inode, (void *)&args);
2033 if (!root_inode) {
2034 SWARN(silent, s, "jmacd-10", "get root inode failed");
2035 goto error_unlocked;
2036 }
2037
2038 /*
2039 * This path assumed to be called with the BKL in the old times.
2040 * Now we have inherited the big reiserfs lock from it and many
2041 * reiserfs helpers called in the mount path and elsewhere require
2042 * this lock to be held even if it's not always necessary. Let's be
2043 * conservative and hold it early. The window can be reduced after
2044 * careful review of the code.
2045 */
2046 reiserfs_write_lock(s);
2047
2048 if (root_inode->i_state & I_NEW) {
2049 reiserfs_read_locked_inode(root_inode, &args);
2050 unlock_new_inode(root_inode);
2051 }
2052
2053 if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2054 !root_inode->i_size) {
2055 SWARN(silent, s, "", "corrupt root inode, run fsck");
2056 iput(root_inode);
2057 errval = -EUCLEAN;
2058 goto error;
2059 }
2060
2061 s->s_root = d_make_root(root_inode);
2062 if (!s->s_root)
2063 goto error;
2064 /* define and initialize hash function */
2065 sbi->s_hash_function = hash_function(s);
2066 if (sbi->s_hash_function == NULL) {
2067 dput(s->s_root);
2068 s->s_root = NULL;
2069 goto error;
2070 }
2071
2072 if (is_reiserfs_3_5(rs)
2073 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2074 set_bit(REISERFS_3_5, &sbi->s_properties);
2075 else if (old_format)
2076 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2077 else
2078 set_bit(REISERFS_3_6, &sbi->s_properties);
2079
2080 if (!(s->s_flags & MS_RDONLY)) {
2081
2082 errval = journal_begin(&th, s, 1);
2083 if (errval) {
2084 dput(s->s_root);
2085 s->s_root = NULL;
2086 goto error;
2087 }
2088 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2089
2090 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2091 set_sb_fs_state(rs, 0);
2092
2093 /*
2094 * Clear out s_bmap_nr if it would wrap. We can handle this
2095 * case, but older revisions can't. This will cause the
2096 * file system to fail mount on those older implementations,
2097 * avoiding corruption. -jeffm
2098 */
2099 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2100 sb_bmap_nr(rs) != 0) {
2101 reiserfs_warning(s, "super-2030", "This file system "
2102 "claims to use %u bitmap blocks in "
2103 "its super block, but requires %u. "
2104 "Clearing to zero.", sb_bmap_nr(rs),
2105 reiserfs_bmap_count(s));
2106
2107 set_sb_bmap_nr(rs, 0);
2108 }
2109
2110 if (old_format_only(s)) {
2111 /*
2112 * filesystem of format 3.5 either with standard
2113 * or non-standard journal
2114 */
2115 if (convert_reiserfs(s)) {
2116 /* and -o conv is given */
2117 if (!silent)
2118 reiserfs_info(s,
2119 "converting 3.5 filesystem to the 3.6 format");
2120
2121 if (is_reiserfs_3_5(rs))
2122 /*
2123 * put magic string of 3.6 format.
2124 * 2.2 will not be able to
2125 * mount this filesystem anymore
2126 */
2127 memcpy(rs->s_v1.s_magic,
2128 reiserfs_3_6_magic_string,
2129 sizeof
2130 (reiserfs_3_6_magic_string));
2131
2132 set_sb_version(rs, REISERFS_VERSION_2);
2133 reiserfs_convert_objectid_map_v1(s);
2134 set_bit(REISERFS_3_6, &sbi->s_properties);
2135 clear_bit(REISERFS_3_5, &sbi->s_properties);
2136 } else if (!silent) {
2137 reiserfs_info(s, "using 3.5.x disk format\n");
2138 }
2139 } else
2140 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2141
2142
2143 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2144 errval = journal_end(&th);
2145 if (errval) {
2146 dput(s->s_root);
2147 s->s_root = NULL;
2148 goto error;
2149 }
2150
2151 reiserfs_write_unlock(s);
2152 if ((errval = reiserfs_lookup_privroot(s)) ||
2153 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2154 dput(s->s_root);
2155 s->s_root = NULL;
2156 goto error_unlocked;
2157 }
2158 reiserfs_write_lock(s);
2159
2160 /*
2161 * look for files which were to be removed in previous session
2162 */
2163 finish_unfinished(s);
2164 } else {
2165 if (old_format_only(s) && !silent) {
2166 reiserfs_info(s, "using 3.5.x disk format\n");
2167 }
2168
2169 reiserfs_write_unlock(s);
2170 if ((errval = reiserfs_lookup_privroot(s)) ||
2171 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2172 dput(s->s_root);
2173 s->s_root = NULL;
2174 goto error_unlocked;
2175 }
2176 reiserfs_write_lock(s);
2177 }
2178 /*
2179 * mark hash in super block: it could be unset. overwrite should be ok
2180 */
2181 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2182
2183 handle_attrs(s);
2184
2185 reiserfs_proc_info_init(s);
2186
2187 init_waitqueue_head(&(sbi->s_wait));
2188 spin_lock_init(&sbi->bitmap_lock);
2189
2190 reiserfs_write_unlock(s);
2191
2192 return (0);
2193
2194 error:
2195 reiserfs_write_unlock(s);
2196
2197 error_unlocked:
2198 /* kill the commit thread, free journal ram */
2199 if (jinit_done) {
2200 reiserfs_write_lock(s);
2201 journal_release_error(NULL, s);
2202 reiserfs_write_unlock(s);
2203 }
2204
2205 if (sbi->commit_wq)
2206 destroy_workqueue(sbi->commit_wq);
2207
2208 reiserfs_cancel_old_flush(s);
2209
2210 reiserfs_free_bitmap_cache(s);
2211 if (SB_BUFFER_WITH_SB(s))
2212 brelse(SB_BUFFER_WITH_SB(s));
2213 #ifdef CONFIG_QUOTA
2214 {
2215 int j;
2216 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2217 kfree(qf_names[j]);
2218 }
2219 #endif
2220 kfree(sbi->s_jdev);
2221 kfree(sbi);
2222
2223 s->s_fs_info = NULL;
2224 return errval;
2225 }
2226
reiserfs_statfs(struct dentry * dentry,struct kstatfs * buf)2227 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2228 {
2229 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2230
2231 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2232 buf->f_bfree = sb_free_blocks(rs);
2233 buf->f_bavail = buf->f_bfree;
2234 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2235 buf->f_bsize = dentry->d_sb->s_blocksize;
2236 /* changed to accommodate gcc folks. */
2237 buf->f_type = REISERFS_SUPER_MAGIC;
2238 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2239 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2240 sizeof(rs->s_uuid)/2);
2241
2242 return 0;
2243 }
2244
2245 #ifdef CONFIG_QUOTA
reiserfs_write_dquot(struct dquot * dquot)2246 static int reiserfs_write_dquot(struct dquot *dquot)
2247 {
2248 struct reiserfs_transaction_handle th;
2249 int ret, err;
2250 int depth;
2251
2252 reiserfs_write_lock(dquot->dq_sb);
2253 ret =
2254 journal_begin(&th, dquot->dq_sb,
2255 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2256 if (ret)
2257 goto out;
2258 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2259 ret = dquot_commit(dquot);
2260 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2261 err = journal_end(&th);
2262 if (!ret && err)
2263 ret = err;
2264 out:
2265 reiserfs_write_unlock(dquot->dq_sb);
2266 return ret;
2267 }
2268
reiserfs_acquire_dquot(struct dquot * dquot)2269 static int reiserfs_acquire_dquot(struct dquot *dquot)
2270 {
2271 struct reiserfs_transaction_handle th;
2272 int ret, err;
2273 int depth;
2274
2275 reiserfs_write_lock(dquot->dq_sb);
2276 ret =
2277 journal_begin(&th, dquot->dq_sb,
2278 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2279 if (ret)
2280 goto out;
2281 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2282 ret = dquot_acquire(dquot);
2283 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2284 err = journal_end(&th);
2285 if (!ret && err)
2286 ret = err;
2287 out:
2288 reiserfs_write_unlock(dquot->dq_sb);
2289 return ret;
2290 }
2291
reiserfs_release_dquot(struct dquot * dquot)2292 static int reiserfs_release_dquot(struct dquot *dquot)
2293 {
2294 struct reiserfs_transaction_handle th;
2295 int ret, err;
2296
2297 reiserfs_write_lock(dquot->dq_sb);
2298 ret =
2299 journal_begin(&th, dquot->dq_sb,
2300 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2301 reiserfs_write_unlock(dquot->dq_sb);
2302 if (ret) {
2303 /* Release dquot anyway to avoid endless cycle in dqput() */
2304 dquot_release(dquot);
2305 goto out;
2306 }
2307 ret = dquot_release(dquot);
2308 reiserfs_write_lock(dquot->dq_sb);
2309 err = journal_end(&th);
2310 if (!ret && err)
2311 ret = err;
2312 reiserfs_write_unlock(dquot->dq_sb);
2313 out:
2314 return ret;
2315 }
2316
reiserfs_mark_dquot_dirty(struct dquot * dquot)2317 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2318 {
2319 /* Are we journaling quotas? */
2320 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2321 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2322 dquot_mark_dquot_dirty(dquot);
2323 return reiserfs_write_dquot(dquot);
2324 } else
2325 return dquot_mark_dquot_dirty(dquot);
2326 }
2327
reiserfs_write_info(struct super_block * sb,int type)2328 static int reiserfs_write_info(struct super_block *sb, int type)
2329 {
2330 struct reiserfs_transaction_handle th;
2331 int ret, err;
2332 int depth;
2333
2334 /* Data block + inode block */
2335 reiserfs_write_lock(sb);
2336 ret = journal_begin(&th, sb, 2);
2337 if (ret)
2338 goto out;
2339 depth = reiserfs_write_unlock_nested(sb);
2340 ret = dquot_commit_info(sb, type);
2341 reiserfs_write_lock_nested(sb, depth);
2342 err = journal_end(&th);
2343 if (!ret && err)
2344 ret = err;
2345 out:
2346 reiserfs_write_unlock(sb);
2347 return ret;
2348 }
2349
2350 /*
2351 * Turn on quotas during mount time - we need to find the quota file and such...
2352 */
reiserfs_quota_on_mount(struct super_block * sb,int type)2353 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2354 {
2355 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2356 REISERFS_SB(sb)->s_jquota_fmt, type);
2357 }
2358
2359 /*
2360 * Standard function to be called on quota_on
2361 */
reiserfs_quota_on(struct super_block * sb,int type,int format_id,struct path * path)2362 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2363 struct path *path)
2364 {
2365 int err;
2366 struct inode *inode;
2367 struct reiserfs_transaction_handle th;
2368 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2369
2370 reiserfs_write_lock(sb);
2371 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2372 err = -EINVAL;
2373 goto out;
2374 }
2375
2376 /* Quotafile not on the same filesystem? */
2377 if (path->dentry->d_sb != sb) {
2378 err = -EXDEV;
2379 goto out;
2380 }
2381 inode = d_inode(path->dentry);
2382 /*
2383 * We must not pack tails for quota files on reiserfs for quota
2384 * IO to work
2385 */
2386 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2387 err = reiserfs_unpack(inode, NULL);
2388 if (err) {
2389 reiserfs_warning(sb, "super-6520",
2390 "Unpacking tail of quota file failed"
2391 " (%d). Cannot turn on quotas.", err);
2392 err = -EINVAL;
2393 goto out;
2394 }
2395 mark_inode_dirty(inode);
2396 }
2397 /* Journaling quota? */
2398 if (REISERFS_SB(sb)->s_qf_names[type]) {
2399 /* Quotafile not of fs root? */
2400 if (path->dentry->d_parent != sb->s_root)
2401 reiserfs_warning(sb, "super-6521",
2402 "Quota file not on filesystem root. "
2403 "Journalled quota will not work.");
2404 }
2405
2406 /*
2407 * When we journal data on quota file, we have to flush journal to see
2408 * all updates to the file when we bypass pagecache...
2409 */
2410 if (reiserfs_file_data_log(inode)) {
2411 /* Just start temporary transaction and finish it */
2412 err = journal_begin(&th, sb, 1);
2413 if (err)
2414 goto out;
2415 err = journal_end_sync(&th);
2416 if (err)
2417 goto out;
2418 }
2419 reiserfs_write_unlock(sb);
2420 return dquot_quota_on(sb, type, format_id, path);
2421 out:
2422 reiserfs_write_unlock(sb);
2423 return err;
2424 }
2425
2426 /*
2427 * Read data from quotafile - avoid pagecache and such because we cannot afford
2428 * acquiring the locks... As quota files are never truncated and quota code
2429 * itself serializes the operations (and no one else should touch the files)
2430 * we don't have to be afraid of races
2431 */
reiserfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)2432 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2433 size_t len, loff_t off)
2434 {
2435 struct inode *inode = sb_dqopt(sb)->files[type];
2436 unsigned long blk = off >> sb->s_blocksize_bits;
2437 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2438 size_t toread;
2439 struct buffer_head tmp_bh, *bh;
2440 loff_t i_size = i_size_read(inode);
2441
2442 if (off > i_size)
2443 return 0;
2444 if (off + len > i_size)
2445 len = i_size - off;
2446 toread = len;
2447 while (toread > 0) {
2448 tocopy =
2449 sb->s_blocksize - offset <
2450 toread ? sb->s_blocksize - offset : toread;
2451 tmp_bh.b_state = 0;
2452 /*
2453 * Quota files are without tails so we can safely
2454 * use this function
2455 */
2456 reiserfs_write_lock(sb);
2457 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2458 reiserfs_write_unlock(sb);
2459 if (err)
2460 return err;
2461 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2462 memset(data, 0, tocopy);
2463 else {
2464 bh = sb_bread(sb, tmp_bh.b_blocknr);
2465 if (!bh)
2466 return -EIO;
2467 memcpy(data, bh->b_data + offset, tocopy);
2468 brelse(bh);
2469 }
2470 offset = 0;
2471 toread -= tocopy;
2472 data += tocopy;
2473 blk++;
2474 }
2475 return len;
2476 }
2477
2478 /*
2479 * Write to quotafile (we know the transaction is already started and has
2480 * enough credits)
2481 */
reiserfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)2482 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2483 const char *data, size_t len, loff_t off)
2484 {
2485 struct inode *inode = sb_dqopt(sb)->files[type];
2486 unsigned long blk = off >> sb->s_blocksize_bits;
2487 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2488 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2489 size_t towrite = len;
2490 struct buffer_head tmp_bh, *bh;
2491
2492 if (!current->journal_info) {
2493 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2494 (unsigned long long)off, (unsigned long long)len);
2495 return -EIO;
2496 }
2497 while (towrite > 0) {
2498 tocopy = sb->s_blocksize - offset < towrite ?
2499 sb->s_blocksize - offset : towrite;
2500 tmp_bh.b_state = 0;
2501 reiserfs_write_lock(sb);
2502 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2503 reiserfs_write_unlock(sb);
2504 if (err)
2505 goto out;
2506 if (offset || tocopy != sb->s_blocksize)
2507 bh = sb_bread(sb, tmp_bh.b_blocknr);
2508 else
2509 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2510 if (!bh) {
2511 err = -EIO;
2512 goto out;
2513 }
2514 lock_buffer(bh);
2515 memcpy(bh->b_data + offset, data, tocopy);
2516 flush_dcache_page(bh->b_page);
2517 set_buffer_uptodate(bh);
2518 unlock_buffer(bh);
2519 reiserfs_write_lock(sb);
2520 reiserfs_prepare_for_journal(sb, bh, 1);
2521 journal_mark_dirty(current->journal_info, bh);
2522 if (!journal_quota)
2523 reiserfs_add_ordered_list(inode, bh);
2524 reiserfs_write_unlock(sb);
2525 brelse(bh);
2526 offset = 0;
2527 towrite -= tocopy;
2528 data += tocopy;
2529 blk++;
2530 }
2531 out:
2532 if (len == towrite)
2533 return err;
2534 if (inode->i_size < off + len - towrite)
2535 i_size_write(inode, off + len - towrite);
2536 inode->i_version++;
2537 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2538 mark_inode_dirty(inode);
2539 return len - towrite;
2540 }
2541
2542 #endif
2543
get_super_block(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)2544 static struct dentry *get_super_block(struct file_system_type *fs_type,
2545 int flags, const char *dev_name,
2546 void *data)
2547 {
2548 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2549 }
2550
init_reiserfs_fs(void)2551 static int __init init_reiserfs_fs(void)
2552 {
2553 int ret;
2554
2555 ret = init_inodecache();
2556 if (ret)
2557 return ret;
2558
2559 reiserfs_proc_info_global_init();
2560
2561 ret = register_filesystem(&reiserfs_fs_type);
2562 if (ret)
2563 goto out;
2564
2565 return 0;
2566 out:
2567 reiserfs_proc_info_global_done();
2568 destroy_inodecache();
2569
2570 return ret;
2571 }
2572
exit_reiserfs_fs(void)2573 static void __exit exit_reiserfs_fs(void)
2574 {
2575 reiserfs_proc_info_global_done();
2576 unregister_filesystem(&reiserfs_fs_type);
2577 destroy_inodecache();
2578 }
2579
2580 struct file_system_type reiserfs_fs_type = {
2581 .owner = THIS_MODULE,
2582 .name = "reiserfs",
2583 .mount = get_super_block,
2584 .kill_sb = reiserfs_kill_sb,
2585 .fs_flags = FS_REQUIRES_DEV,
2586 };
2587 MODULE_ALIAS_FS("reiserfs");
2588
2589 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2590 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2591 MODULE_LICENSE("GPL");
2592
2593 module_init(init_reiserfs_fs);
2594 module_exit(exit_reiserfs_fs);
2595