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 /*
93 * We need s_umount for protecting quota writeback. We have to use
94 * trylock as reiserfs_cancel_old_flush() may be waiting for this work
95 * to complete with s_umount held.
96 */
97 if (!down_read_trylock(&s->s_umount)) {
98 /* Requeue work if we are not cancelling it */
99 spin_lock(&sbi->old_work_lock);
100 if (sbi->work_queued == 1)
101 queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
102 spin_unlock(&sbi->old_work_lock);
103 return;
104 }
105 spin_lock(&sbi->old_work_lock);
106 /* Avoid clobbering the cancel state... */
107 if (sbi->work_queued == 1)
108 sbi->work_queued = 0;
109 spin_unlock(&sbi->old_work_lock);
110
111 reiserfs_sync_fs(s, 1);
112 up_read(&s->s_umount);
113 }
114
reiserfs_schedule_old_flush(struct super_block * s)115 void reiserfs_schedule_old_flush(struct super_block *s)
116 {
117 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
118 unsigned long delay;
119
120 /*
121 * Avoid scheduling flush when sb is being shut down. It can race
122 * with journal shutdown and free still queued delayed work.
123 */
124 if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
125 return;
126
127 spin_lock(&sbi->old_work_lock);
128 if (!sbi->work_queued) {
129 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
130 queue_delayed_work(system_long_wq, &sbi->old_work, delay);
131 sbi->work_queued = 1;
132 }
133 spin_unlock(&sbi->old_work_lock);
134 }
135
reiserfs_cancel_old_flush(struct super_block * s)136 void reiserfs_cancel_old_flush(struct super_block *s)
137 {
138 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
139
140 spin_lock(&sbi->old_work_lock);
141 /* Make sure no new flushes will be queued */
142 sbi->work_queued = 2;
143 spin_unlock(&sbi->old_work_lock);
144 cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
145 }
146
reiserfs_freeze(struct super_block * s)147 static int reiserfs_freeze(struct super_block *s)
148 {
149 struct reiserfs_transaction_handle th;
150
151 reiserfs_cancel_old_flush(s);
152
153 reiserfs_write_lock(s);
154 if (!sb_rdonly(s)) {
155 int err = journal_begin(&th, s, 1);
156 if (err) {
157 reiserfs_block_writes(&th);
158 } else {
159 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
160 1);
161 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
162 reiserfs_block_writes(&th);
163 journal_end_sync(&th);
164 }
165 }
166 reiserfs_write_unlock(s);
167 return 0;
168 }
169
reiserfs_unfreeze(struct super_block * s)170 static int reiserfs_unfreeze(struct super_block *s)
171 {
172 struct reiserfs_sb_info *sbi = REISERFS_SB(s);
173
174 reiserfs_allow_writes(s);
175 spin_lock(&sbi->old_work_lock);
176 /* Allow old_work to run again */
177 sbi->work_queued = 0;
178 spin_unlock(&sbi->old_work_lock);
179 return 0;
180 }
181
182 extern const struct in_core_key MAX_IN_CORE_KEY;
183
184 /*
185 * this is used to delete "save link" when there are no items of a
186 * file it points to. It can either happen if unlink is completed but
187 * "save unlink" removal, or if file has both unlink and truncate
188 * pending and as unlink completes first (because key of "save link"
189 * protecting unlink is bigger that a key lf "save link" which
190 * protects truncate), so there left no items to make truncate
191 * completion on
192 */
remove_save_link_only(struct super_block * s,struct reiserfs_key * key,int oid_free)193 static int remove_save_link_only(struct super_block *s,
194 struct reiserfs_key *key, int oid_free)
195 {
196 struct reiserfs_transaction_handle th;
197 int err;
198
199 /* we are going to do one balancing */
200 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
201 if (err)
202 return err;
203
204 reiserfs_delete_solid_item(&th, NULL, key);
205 if (oid_free)
206 /* removals are protected by direct items */
207 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
208
209 return journal_end(&th);
210 }
211
212 #ifdef CONFIG_QUOTA
213 static int reiserfs_quota_on_mount(struct super_block *, int);
214 #endif
215
216 /*
217 * Look for uncompleted unlinks and truncates and complete them
218 *
219 * Called with superblock write locked. If quotas are enabled, we have to
220 * release/retake lest we call dquot_quota_on_mount(), proceed to
221 * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
222 * cpu worklets to complete flush_async_commits() that in turn wait for the
223 * superblock write lock.
224 */
finish_unfinished(struct super_block * s)225 static int finish_unfinished(struct super_block *s)
226 {
227 INITIALIZE_PATH(path);
228 struct cpu_key max_cpu_key, obj_key;
229 struct reiserfs_key save_link_key, last_inode_key;
230 int retval = 0;
231 struct item_head *ih;
232 struct buffer_head *bh;
233 int item_pos;
234 char *item;
235 int done;
236 struct inode *inode;
237 int truncate;
238 #ifdef CONFIG_QUOTA
239 int i;
240 int ms_active_set;
241 int quota_enabled[REISERFS_MAXQUOTAS];
242 #endif
243
244 /* compose key to look for "save" links */
245 max_cpu_key.version = KEY_FORMAT_3_5;
246 max_cpu_key.on_disk_key.k_dir_id = ~0U;
247 max_cpu_key.on_disk_key.k_objectid = ~0U;
248 set_cpu_key_k_offset(&max_cpu_key, ~0U);
249 max_cpu_key.key_length = 3;
250
251 memset(&last_inode_key, 0, sizeof(last_inode_key));
252
253 #ifdef CONFIG_QUOTA
254 /* Needed for iput() to work correctly and not trash data */
255 if (s->s_flags & SB_ACTIVE) {
256 ms_active_set = 0;
257 } else {
258 ms_active_set = 1;
259 s->s_flags |= SB_ACTIVE;
260 }
261 /* Turn on quotas so that they are updated correctly */
262 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
263 quota_enabled[i] = 1;
264 if (REISERFS_SB(s)->s_qf_names[i]) {
265 int ret;
266
267 if (sb_has_quota_active(s, i)) {
268 quota_enabled[i] = 0;
269 continue;
270 }
271 reiserfs_write_unlock(s);
272 ret = reiserfs_quota_on_mount(s, i);
273 reiserfs_write_lock(s);
274 if (ret < 0)
275 reiserfs_warning(s, "reiserfs-2500",
276 "cannot turn on journaled "
277 "quota: error %d", ret);
278 }
279 }
280 #endif
281
282 done = 0;
283 REISERFS_SB(s)->s_is_unlinked_ok = 1;
284 while (!retval) {
285 int depth;
286 retval = search_item(s, &max_cpu_key, &path);
287 if (retval != ITEM_NOT_FOUND) {
288 reiserfs_error(s, "vs-2140",
289 "search_by_key returned %d", retval);
290 break;
291 }
292
293 bh = get_last_bh(&path);
294 item_pos = get_item_pos(&path);
295 if (item_pos != B_NR_ITEMS(bh)) {
296 reiserfs_warning(s, "vs-2060",
297 "wrong position found");
298 break;
299 }
300 item_pos--;
301 ih = item_head(bh, item_pos);
302
303 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
304 /* there are no "save" links anymore */
305 break;
306
307 save_link_key = ih->ih_key;
308 if (is_indirect_le_ih(ih))
309 truncate = 1;
310 else
311 truncate = 0;
312
313 /* reiserfs_iget needs k_dirid and k_objectid only */
314 item = ih_item_body(bh, ih);
315 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
316 obj_key.on_disk_key.k_objectid =
317 le32_to_cpu(ih->ih_key.k_objectid);
318 obj_key.on_disk_key.k_offset = 0;
319 obj_key.on_disk_key.k_type = 0;
320
321 pathrelse(&path);
322
323 inode = reiserfs_iget(s, &obj_key);
324 if (IS_ERR_OR_NULL(inode)) {
325 /*
326 * the unlink almost completed, it just did not
327 * manage to remove "save" link and release objectid
328 */
329 reiserfs_warning(s, "vs-2180", "iget failed for %K",
330 &obj_key);
331 retval = remove_save_link_only(s, &save_link_key, 1);
332 continue;
333 }
334
335 if (!truncate && inode->i_nlink) {
336 /* file is not unlinked */
337 reiserfs_warning(s, "vs-2185",
338 "file %K is not unlinked",
339 &obj_key);
340 retval = remove_save_link_only(s, &save_link_key, 0);
341 continue;
342 }
343 depth = reiserfs_write_unlock_nested(inode->i_sb);
344 dquot_initialize(inode);
345 reiserfs_write_lock_nested(inode->i_sb, depth);
346
347 if (truncate && S_ISDIR(inode->i_mode)) {
348 /*
349 * We got a truncate request for a dir which
350 * is impossible. The only imaginable way is to
351 * execute unfinished truncate request then boot
352 * into old kernel, remove the file and create dir
353 * with the same key.
354 */
355 reiserfs_warning(s, "green-2101",
356 "impossible truncate on a "
357 "directory %k. Please report",
358 INODE_PKEY(inode));
359 retval = remove_save_link_only(s, &save_link_key, 0);
360 truncate = 0;
361 iput(inode);
362 continue;
363 }
364
365 if (truncate) {
366 REISERFS_I(inode)->i_flags |=
367 i_link_saved_truncate_mask;
368 /*
369 * not completed truncate found. New size was
370 * committed together with "save" link
371 */
372 reiserfs_info(s, "Truncating %k to %lld ..",
373 INODE_PKEY(inode), inode->i_size);
374
375 /* don't update modification time */
376 reiserfs_truncate_file(inode, 0);
377
378 retval = remove_save_link(inode, truncate);
379 } else {
380 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
381 /* not completed unlink (rmdir) found */
382 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
383 if (memcmp(&last_inode_key, INODE_PKEY(inode),
384 sizeof(last_inode_key))){
385 last_inode_key = *INODE_PKEY(inode);
386 /* removal gets completed in iput */
387 retval = 0;
388 } else {
389 reiserfs_warning(s, "super-2189", "Dead loop "
390 "in finish_unfinished "
391 "detected, just remove "
392 "save link\n");
393 retval = remove_save_link_only(s,
394 &save_link_key, 0);
395 }
396 }
397
398 iput(inode);
399 printk("done\n");
400 done++;
401 }
402 REISERFS_SB(s)->s_is_unlinked_ok = 0;
403
404 #ifdef CONFIG_QUOTA
405 /* Turn quotas off */
406 reiserfs_write_unlock(s);
407 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
408 if (sb_dqopt(s)->files[i] && quota_enabled[i])
409 dquot_quota_off(s, i);
410 }
411 reiserfs_write_lock(s);
412 if (ms_active_set)
413 /* Restore the flag back */
414 s->s_flags &= ~SB_ACTIVE;
415 #endif
416 pathrelse(&path);
417 if (done)
418 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
419 "Completed\n", done);
420 return retval;
421 }
422
423 /*
424 * to protect file being unlinked from getting lost we "safe" link files
425 * being unlinked. This link will be deleted in the same transaction with last
426 * item of file. mounting the filesystem we scan all these links and remove
427 * files which almost got lost
428 */
add_save_link(struct reiserfs_transaction_handle * th,struct inode * inode,int truncate)429 void add_save_link(struct reiserfs_transaction_handle *th,
430 struct inode *inode, int truncate)
431 {
432 INITIALIZE_PATH(path);
433 int retval;
434 struct cpu_key key;
435 struct item_head ih;
436 __le32 link;
437
438 BUG_ON(!th->t_trans_id);
439
440 /* file can only get one "save link" of each kind */
441 RFALSE(truncate &&
442 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
443 "saved link already exists for truncated inode %lx",
444 (long)inode->i_ino);
445 RFALSE(!truncate &&
446 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
447 "saved link already exists for unlinked inode %lx",
448 (long)inode->i_ino);
449
450 /* setup key of "save" link */
451 key.version = KEY_FORMAT_3_5;
452 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
453 key.on_disk_key.k_objectid = inode->i_ino;
454 if (!truncate) {
455 /* unlink, rmdir, rename */
456 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
457 set_cpu_key_k_type(&key, TYPE_DIRECT);
458
459 /* item head of "safe" link */
460 make_le_item_head(&ih, &key, key.version,
461 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
462 4 /*length */ , 0xffff /*free space */ );
463 } else {
464 /* truncate */
465 if (S_ISDIR(inode->i_mode))
466 reiserfs_warning(inode->i_sb, "green-2102",
467 "Adding a truncate savelink for "
468 "a directory %k! Please report",
469 INODE_PKEY(inode));
470 set_cpu_key_k_offset(&key, 1);
471 set_cpu_key_k_type(&key, TYPE_INDIRECT);
472
473 /* item head of "safe" link */
474 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
475 4 /*length */ , 0 /*free space */ );
476 }
477 key.key_length = 3;
478
479 /* look for its place in the tree */
480 retval = search_item(inode->i_sb, &key, &path);
481 if (retval != ITEM_NOT_FOUND) {
482 if (retval != -ENOSPC)
483 reiserfs_error(inode->i_sb, "vs-2100",
484 "search_by_key (%K) returned %d", &key,
485 retval);
486 pathrelse(&path);
487 return;
488 }
489
490 /* body of "save" link */
491 link = INODE_PKEY(inode)->k_dir_id;
492
493 /* put "save" link into tree, don't charge quota to anyone */
494 retval =
495 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
496 if (retval) {
497 if (retval != -ENOSPC)
498 reiserfs_error(inode->i_sb, "vs-2120",
499 "insert_item returned %d", retval);
500 } else {
501 if (truncate)
502 REISERFS_I(inode)->i_flags |=
503 i_link_saved_truncate_mask;
504 else
505 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
506 }
507 }
508
509 /* this opens transaction unlike add_save_link */
remove_save_link(struct inode * inode,int truncate)510 int remove_save_link(struct inode *inode, int truncate)
511 {
512 struct reiserfs_transaction_handle th;
513 struct reiserfs_key key;
514 int err;
515
516 /* we are going to do one balancing only */
517 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
518 if (err)
519 return err;
520
521 /* setup key of "save" link */
522 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
523 key.k_objectid = INODE_PKEY(inode)->k_objectid;
524 if (!truncate) {
525 /* unlink, rmdir, rename */
526 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
527 1 + inode->i_sb->s_blocksize);
528 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
529 } else {
530 /* truncate */
531 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
532 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
533 }
534
535 if ((truncate &&
536 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
537 (!truncate &&
538 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
539 /* don't take quota bytes from anywhere */
540 reiserfs_delete_solid_item(&th, NULL, &key);
541 if (!truncate) {
542 reiserfs_release_objectid(&th, inode->i_ino);
543 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
544 } else
545 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
546
547 return journal_end(&th);
548 }
549
reiserfs_kill_sb(struct super_block * s)550 static void reiserfs_kill_sb(struct super_block *s)
551 {
552 if (REISERFS_SB(s)) {
553 reiserfs_proc_info_done(s);
554 /*
555 * Force any pending inode evictions to occur now. Any
556 * inodes to be removed that have extended attributes
557 * associated with them need to clean them up before
558 * we can release the extended attribute root dentries.
559 * shrink_dcache_for_umount will BUG if we don't release
560 * those before it's called so ->put_super is too late.
561 */
562 shrink_dcache_sb(s);
563
564 dput(REISERFS_SB(s)->xattr_root);
565 REISERFS_SB(s)->xattr_root = NULL;
566 dput(REISERFS_SB(s)->priv_root);
567 REISERFS_SB(s)->priv_root = NULL;
568 }
569
570 kill_block_super(s);
571 }
572
573 #ifdef CONFIG_QUOTA
574 static int reiserfs_quota_off(struct super_block *sb, int type);
575
reiserfs_quota_off_umount(struct super_block * s)576 static void reiserfs_quota_off_umount(struct super_block *s)
577 {
578 int type;
579
580 for (type = 0; type < REISERFS_MAXQUOTAS; type++)
581 reiserfs_quota_off(s, type);
582 }
583 #else
reiserfs_quota_off_umount(struct super_block * s)584 static inline void reiserfs_quota_off_umount(struct super_block *s)
585 {
586 }
587 #endif
588
reiserfs_put_super(struct super_block * s)589 static void reiserfs_put_super(struct super_block *s)
590 {
591 struct reiserfs_transaction_handle th;
592 th.t_trans_id = 0;
593
594 reiserfs_quota_off_umount(s);
595
596 reiserfs_write_lock(s);
597
598 /*
599 * change file system state to current state if it was mounted
600 * with read-write permissions
601 */
602 if (!sb_rdonly(s)) {
603 if (!journal_begin(&th, s, 10)) {
604 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
605 1);
606 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
607 REISERFS_SB(s)->s_mount_state);
608 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
609 }
610 }
611
612 /*
613 * note, journal_release checks for readonly mount, and can
614 * decide not to do a journal_end
615 */
616 journal_release(&th, s);
617
618 reiserfs_free_bitmap_cache(s);
619
620 brelse(SB_BUFFER_WITH_SB(s));
621
622 print_statistics(s);
623
624 if (REISERFS_SB(s)->reserved_blocks != 0) {
625 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
626 REISERFS_SB(s)->reserved_blocks);
627 }
628
629 reiserfs_write_unlock(s);
630 mutex_destroy(&REISERFS_SB(s)->lock);
631 destroy_workqueue(REISERFS_SB(s)->commit_wq);
632 kfree(REISERFS_SB(s)->s_jdev);
633 kfree(s->s_fs_info);
634 s->s_fs_info = NULL;
635 }
636
637 static struct kmem_cache *reiserfs_inode_cachep;
638
reiserfs_alloc_inode(struct super_block * sb)639 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
640 {
641 struct reiserfs_inode_info *ei;
642 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
643 if (!ei)
644 return NULL;
645 atomic_set(&ei->openers, 0);
646 mutex_init(&ei->tailpack);
647 #ifdef CONFIG_QUOTA
648 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
649 #endif
650
651 return &ei->vfs_inode;
652 }
653
reiserfs_free_inode(struct inode * inode)654 static void reiserfs_free_inode(struct inode *inode)
655 {
656 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657 }
658
init_once(void * foo)659 static void init_once(void *foo)
660 {
661 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
662
663 INIT_LIST_HEAD(&ei->i_prealloc_list);
664 inode_init_once(&ei->vfs_inode);
665 }
666
init_inodecache(void)667 static int __init init_inodecache(void)
668 {
669 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
670 sizeof(struct
671 reiserfs_inode_info),
672 0, (SLAB_RECLAIM_ACCOUNT|
673 SLAB_MEM_SPREAD|
674 SLAB_ACCOUNT),
675 init_once);
676 if (reiserfs_inode_cachep == NULL)
677 return -ENOMEM;
678 return 0;
679 }
680
destroy_inodecache(void)681 static void destroy_inodecache(void)
682 {
683 /*
684 * Make sure all delayed rcu free inodes are flushed before we
685 * destroy cache.
686 */
687 rcu_barrier();
688 kmem_cache_destroy(reiserfs_inode_cachep);
689 }
690
691 /* we don't mark inodes dirty, we just log them */
reiserfs_dirty_inode(struct inode * inode,int flags)692 static void reiserfs_dirty_inode(struct inode *inode, int flags)
693 {
694 struct reiserfs_transaction_handle th;
695
696 int err = 0;
697
698 if (sb_rdonly(inode->i_sb)) {
699 reiserfs_warning(inode->i_sb, "clm-6006",
700 "writing inode %lu on readonly FS",
701 inode->i_ino);
702 return;
703 }
704 reiserfs_write_lock(inode->i_sb);
705
706 /*
707 * this is really only used for atime updates, so they don't have
708 * to be included in O_SYNC or fsync
709 */
710 err = journal_begin(&th, inode->i_sb, 1);
711 if (err)
712 goto out;
713
714 reiserfs_update_sd(&th, inode);
715 journal_end(&th);
716
717 out:
718 reiserfs_write_unlock(inode->i_sb);
719 }
720
reiserfs_show_options(struct seq_file * seq,struct dentry * root)721 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
722 {
723 struct super_block *s = root->d_sb;
724 struct reiserfs_journal *journal = SB_JOURNAL(s);
725 long opts = REISERFS_SB(s)->s_mount_opt;
726
727 if (opts & (1 << REISERFS_LARGETAIL))
728 seq_puts(seq, ",tails=on");
729 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
730 seq_puts(seq, ",notail");
731 /* tails=small is default so we don't show it */
732
733 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
734 seq_puts(seq, ",barrier=none");
735 /* barrier=flush is default so we don't show it */
736
737 if (opts & (1 << REISERFS_ERROR_CONTINUE))
738 seq_puts(seq, ",errors=continue");
739 else if (opts & (1 << REISERFS_ERROR_PANIC))
740 seq_puts(seq, ",errors=panic");
741 /* errors=ro is default so we don't show it */
742
743 if (opts & (1 << REISERFS_DATA_LOG))
744 seq_puts(seq, ",data=journal");
745 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
746 seq_puts(seq, ",data=writeback");
747 /* data=ordered is default so we don't show it */
748
749 if (opts & (1 << REISERFS_ATTRS))
750 seq_puts(seq, ",attrs");
751
752 if (opts & (1 << REISERFS_XATTRS_USER))
753 seq_puts(seq, ",user_xattr");
754
755 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
756 seq_puts(seq, ",expose_privroot");
757
758 if (opts & (1 << REISERFS_POSIXACL))
759 seq_puts(seq, ",acl");
760
761 if (REISERFS_SB(s)->s_jdev)
762 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
763
764 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
765 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
766
767 #ifdef CONFIG_QUOTA
768 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
769 seq_show_option(seq, "usrjquota",
770 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
771 else if (opts & (1 << REISERFS_USRQUOTA))
772 seq_puts(seq, ",usrquota");
773 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
774 seq_show_option(seq, "grpjquota",
775 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
776 else if (opts & (1 << REISERFS_GRPQUOTA))
777 seq_puts(seq, ",grpquota");
778 if (REISERFS_SB(s)->s_jquota_fmt) {
779 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
780 seq_puts(seq, ",jqfmt=vfsold");
781 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
782 seq_puts(seq, ",jqfmt=vfsv0");
783 }
784 #endif
785
786 /* Block allocator options */
787 if (opts & (1 << REISERFS_NO_BORDER))
788 seq_puts(seq, ",block-allocator=noborder");
789 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
790 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
791 if (opts & (1 << REISERFS_HASHED_RELOCATION))
792 seq_puts(seq, ",block-allocator=hashed_relocation");
793 if (opts & (1 << REISERFS_TEST4))
794 seq_puts(seq, ",block-allocator=test4");
795 show_alloc_options(seq, s);
796 return 0;
797 }
798
799 #ifdef CONFIG_QUOTA
800 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
801 size_t, loff_t);
802 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
803 loff_t);
804
reiserfs_get_dquots(struct inode * inode)805 static struct dquot **reiserfs_get_dquots(struct inode *inode)
806 {
807 return REISERFS_I(inode)->i_dquot;
808 }
809 #endif
810
811 static const struct super_operations reiserfs_sops = {
812 .alloc_inode = reiserfs_alloc_inode,
813 .free_inode = reiserfs_free_inode,
814 .write_inode = reiserfs_write_inode,
815 .dirty_inode = reiserfs_dirty_inode,
816 .evict_inode = reiserfs_evict_inode,
817 .put_super = reiserfs_put_super,
818 .sync_fs = reiserfs_sync_fs,
819 .freeze_fs = reiserfs_freeze,
820 .unfreeze_fs = reiserfs_unfreeze,
821 .statfs = reiserfs_statfs,
822 .remount_fs = reiserfs_remount,
823 .show_options = reiserfs_show_options,
824 #ifdef CONFIG_QUOTA
825 .quota_read = reiserfs_quota_read,
826 .quota_write = reiserfs_quota_write,
827 .get_dquots = reiserfs_get_dquots,
828 #endif
829 };
830
831 #ifdef CONFIG_QUOTA
832 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
833
834 static int reiserfs_write_dquot(struct dquot *);
835 static int reiserfs_acquire_dquot(struct dquot *);
836 static int reiserfs_release_dquot(struct dquot *);
837 static int reiserfs_mark_dquot_dirty(struct dquot *);
838 static int reiserfs_write_info(struct super_block *, int);
839 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
840
841 static const struct dquot_operations reiserfs_quota_operations = {
842 .write_dquot = reiserfs_write_dquot,
843 .acquire_dquot = reiserfs_acquire_dquot,
844 .release_dquot = reiserfs_release_dquot,
845 .mark_dirty = reiserfs_mark_dquot_dirty,
846 .write_info = reiserfs_write_info,
847 .alloc_dquot = dquot_alloc,
848 .destroy_dquot = dquot_destroy,
849 .get_next_id = dquot_get_next_id,
850 };
851
852 static const struct quotactl_ops reiserfs_qctl_operations = {
853 .quota_on = reiserfs_quota_on,
854 .quota_off = reiserfs_quota_off,
855 .quota_sync = dquot_quota_sync,
856 .get_state = dquot_get_state,
857 .set_info = dquot_set_dqinfo,
858 .get_dqblk = dquot_get_dqblk,
859 .set_dqblk = dquot_set_dqblk,
860 };
861 #endif
862
863 static const struct export_operations reiserfs_export_ops = {
864 .encode_fh = reiserfs_encode_fh,
865 .fh_to_dentry = reiserfs_fh_to_dentry,
866 .fh_to_parent = reiserfs_fh_to_parent,
867 .get_parent = reiserfs_get_parent,
868 };
869
870 /*
871 * this struct is used in reiserfs_getopt () for containing the value for
872 * those mount options that have values rather than being toggles.
873 */
874 typedef struct {
875 char *value;
876 /*
877 * bitmask which is to set on mount_options bitmask
878 * when this value is found, 0 is no bits are to be changed.
879 */
880 int setmask;
881 /*
882 * bitmask which is to clear on mount_options bitmask
883 * when this value is found, 0 is no bits are to be changed.
884 * This is applied BEFORE setmask
885 */
886 int clrmask;
887 } arg_desc_t;
888
889 /* Set this bit in arg_required to allow empty arguments */
890 #define REISERFS_OPT_ALLOWEMPTY 31
891
892 /*
893 * this struct is used in reiserfs_getopt() for describing the
894 * set of reiserfs mount options
895 */
896 typedef struct {
897 char *option_name;
898
899 /* 0 if argument is not required, not 0 otherwise */
900 int arg_required;
901
902 /* list of values accepted by an option */
903 const arg_desc_t *values;
904
905 /*
906 * bitmask which is to set on mount_options bitmask
907 * when this value is found, 0 is no bits are to be changed.
908 */
909 int setmask;
910
911 /*
912 * bitmask which is to clear on mount_options bitmask
913 * when this value is found, 0 is no bits are to be changed.
914 * This is applied BEFORE setmask
915 */
916 int clrmask;
917 } opt_desc_t;
918
919 /* possible values for -o data= */
920 static const arg_desc_t logging_mode[] = {
921 {"ordered", 1 << REISERFS_DATA_ORDERED,
922 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
923 {"journal", 1 << REISERFS_DATA_LOG,
924 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
925 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
926 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
927 {.value = NULL}
928 };
929
930 /* possible values for -o barrier= */
931 static const arg_desc_t barrier_mode[] = {
932 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
933 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
934 {.value = NULL}
935 };
936
937 /*
938 * possible values for "-o block-allocator=" and bits which are to be set in
939 * s_mount_opt of reiserfs specific part of in-core super block
940 */
941 static const arg_desc_t balloc[] = {
942 {"noborder", 1 << REISERFS_NO_BORDER, 0},
943 {"border", 0, 1 << REISERFS_NO_BORDER},
944 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
945 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
946 {"test4", 1 << REISERFS_TEST4, 0},
947 {"notest4", 0, 1 << REISERFS_TEST4},
948 {NULL, 0, 0}
949 };
950
951 static const arg_desc_t tails[] = {
952 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
953 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
954 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
955 {NULL, 0, 0}
956 };
957
958 static const arg_desc_t error_actions[] = {
959 {"panic", 1 << REISERFS_ERROR_PANIC,
960 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
961 {"ro-remount", 1 << REISERFS_ERROR_RO,
962 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
963 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
964 {"continue", 1 << REISERFS_ERROR_CONTINUE,
965 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
966 #endif
967 {NULL, 0, 0},
968 };
969
970 /*
971 * proceed only one option from a list *cur - string containing of mount
972 * options
973 * opts - array of options which are accepted
974 * opt_arg - if option is found and requires an argument and if it is specifed
975 * in the input - pointer to the argument is stored here
976 * bit_flags - if option requires to set a certain bit - it is set here
977 * return -1 if unknown option is found, opt->arg_required otherwise
978 */
reiserfs_getopt(struct super_block * s,char ** cur,opt_desc_t * opts,char ** opt_arg,unsigned long * bit_flags)979 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
980 char **opt_arg, unsigned long *bit_flags)
981 {
982 char *p;
983 /*
984 * foo=bar,
985 * ^ ^ ^
986 * | | +-- option_end
987 * | +-- arg_start
988 * +-- option_start
989 */
990 const opt_desc_t *opt;
991 const arg_desc_t *arg;
992
993 p = *cur;
994
995 /* assume argument cannot contain commas */
996 *cur = strchr(p, ',');
997 if (*cur) {
998 *(*cur) = '\0';
999 (*cur)++;
1000 }
1001
1002 if (!strncmp(p, "alloc=", 6)) {
1003 /*
1004 * Ugly special case, probably we should redo options
1005 * parser so that it can understand several arguments for
1006 * some options, also so that it can fill several bitfields
1007 * with option values.
1008 */
1009 if (reiserfs_parse_alloc_options(s, p + 6)) {
1010 return -1;
1011 } else {
1012 return 0;
1013 }
1014 }
1015
1016 /* for every option in the list */
1017 for (opt = opts; opt->option_name; opt++) {
1018 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1019 if (bit_flags) {
1020 if (opt->clrmask ==
1021 (1 << REISERFS_UNSUPPORTED_OPT))
1022 reiserfs_warning(s, "super-6500",
1023 "%s not supported.\n",
1024 p);
1025 else
1026 *bit_flags &= ~opt->clrmask;
1027 if (opt->setmask ==
1028 (1 << REISERFS_UNSUPPORTED_OPT))
1029 reiserfs_warning(s, "super-6501",
1030 "%s not supported.\n",
1031 p);
1032 else
1033 *bit_flags |= opt->setmask;
1034 }
1035 break;
1036 }
1037 }
1038 if (!opt->option_name) {
1039 reiserfs_warning(s, "super-6502",
1040 "unknown mount option \"%s\"", p);
1041 return -1;
1042 }
1043
1044 p += strlen(opt->option_name);
1045 switch (*p) {
1046 case '=':
1047 if (!opt->arg_required) {
1048 reiserfs_warning(s, "super-6503",
1049 "the option \"%s\" does not "
1050 "require an argument\n",
1051 opt->option_name);
1052 return -1;
1053 }
1054 break;
1055
1056 case 0:
1057 if (opt->arg_required) {
1058 reiserfs_warning(s, "super-6504",
1059 "the option \"%s\" requires an "
1060 "argument\n", opt->option_name);
1061 return -1;
1062 }
1063 break;
1064 default:
1065 reiserfs_warning(s, "super-6505",
1066 "head of option \"%s\" is only correct\n",
1067 opt->option_name);
1068 return -1;
1069 }
1070
1071 /*
1072 * move to the argument, or to next option if argument is not
1073 * required
1074 */
1075 p++;
1076
1077 if (opt->arg_required
1078 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1079 && !strlen(p)) {
1080 /* this catches "option=," if not allowed */
1081 reiserfs_warning(s, "super-6506",
1082 "empty argument for \"%s\"\n",
1083 opt->option_name);
1084 return -1;
1085 }
1086
1087 if (!opt->values) {
1088 /* *=NULLopt_arg contains pointer to argument */
1089 *opt_arg = p;
1090 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1091 }
1092
1093 /* values possible for this option are listed in opt->values */
1094 for (arg = opt->values; arg->value; arg++) {
1095 if (!strcmp(p, arg->value)) {
1096 if (bit_flags) {
1097 *bit_flags &= ~arg->clrmask;
1098 *bit_flags |= arg->setmask;
1099 }
1100 return opt->arg_required;
1101 }
1102 }
1103
1104 reiserfs_warning(s, "super-6506",
1105 "bad value \"%s\" for option \"%s\"\n", p,
1106 opt->option_name);
1107 return -1;
1108 }
1109
1110 /* 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)1111 static int reiserfs_parse_options(struct super_block *s,
1112
1113 /* string given via mount's -o */
1114 char *options,
1115
1116 /*
1117 * after the parsing phase, contains the
1118 * collection of bitflags defining what
1119 * mount options were selected.
1120 */
1121 unsigned long *mount_options,
1122
1123 /* strtol-ed from NNN of resize=NNN */
1124 unsigned long *blocks,
1125 char **jdev_name,
1126 unsigned int *commit_max_age,
1127 char **qf_names,
1128 unsigned int *qfmt)
1129 {
1130 int c;
1131 char *arg = NULL;
1132 char *pos;
1133 opt_desc_t opts[] = {
1134 /*
1135 * Compatibility stuff, so that -o notail for old
1136 * setups still work
1137 */
1138 {"tails",.arg_required = 't',.values = tails},
1139 {"notail",.clrmask =
1140 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1141 {"conv",.setmask = 1 << REISERFS_CONVERT},
1142 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1143 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1144 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1145 #ifdef CONFIG_REISERFS_FS_XATTR
1146 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1147 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1148 #else
1149 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1150 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1151 #endif
1152 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1153 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1154 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1155 #else
1156 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1158 #endif
1159 {.option_name = "nolog"},
1160 {"replayonly",.setmask = 1 << REPLAYONLY},
1161 {"block-allocator",.arg_required = 'a',.values = balloc},
1162 {"data",.arg_required = 'd',.values = logging_mode},
1163 {"barrier",.arg_required = 'b',.values = barrier_mode},
1164 {"resize",.arg_required = 'r',.values = NULL},
1165 {"jdev",.arg_required = 'j',.values = NULL},
1166 {"nolargeio",.arg_required = 'w',.values = NULL},
1167 {"commit",.arg_required = 'c',.values = NULL},
1168 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1169 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1170 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1171 {"errors",.arg_required = 'e',.values = error_actions},
1172 {"usrjquota",.arg_required =
1173 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1174 {"grpjquota",.arg_required =
1175 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1176 {"jqfmt",.arg_required = 'f',.values = NULL},
1177 {.option_name = NULL}
1178 };
1179
1180 *blocks = 0;
1181 if (!options || !*options)
1182 /*
1183 * use default configuration: create tails, journaling on, no
1184 * conversion to newest format
1185 */
1186 return 1;
1187
1188 for (pos = options; pos;) {
1189 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1190 if (c == -1)
1191 /* wrong option is given */
1192 return 0;
1193
1194 if (c == 'r') {
1195 char *p;
1196
1197 p = NULL;
1198 /* "resize=NNN" or "resize=auto" */
1199
1200 if (!strcmp(arg, "auto")) {
1201 /* From JFS code, to auto-get the size. */
1202 *blocks =
1203 i_size_read(s->s_bdev->bd_inode) >> s->
1204 s_blocksize_bits;
1205 } else {
1206 *blocks = simple_strtoul(arg, &p, 0);
1207 if (*p != '\0') {
1208 /* NNN does not look like a number */
1209 reiserfs_warning(s, "super-6507",
1210 "bad value %s for "
1211 "-oresize\n", arg);
1212 return 0;
1213 }
1214 }
1215 }
1216
1217 if (c == 'c') {
1218 char *p = NULL;
1219 unsigned long val = simple_strtoul(arg, &p, 0);
1220 /* commit=NNN (time in seconds) */
1221 if (*p != '\0' || val >= (unsigned int)-1) {
1222 reiserfs_warning(s, "super-6508",
1223 "bad value %s for -ocommit\n",
1224 arg);
1225 return 0;
1226 }
1227 *commit_max_age = (unsigned int)val;
1228 }
1229
1230 if (c == 'w') {
1231 reiserfs_warning(s, "super-6509", "nolargeio option "
1232 "is no longer supported");
1233 return 0;
1234 }
1235
1236 if (c == 'j') {
1237 if (arg && *arg && jdev_name) {
1238 /* Hm, already assigned? */
1239 if (*jdev_name) {
1240 reiserfs_warning(s, "super-6510",
1241 "journal device was "
1242 "already specified to "
1243 "be %s", *jdev_name);
1244 return 0;
1245 }
1246 *jdev_name = arg;
1247 }
1248 }
1249 #ifdef CONFIG_QUOTA
1250 if (c == 'u' || c == 'g') {
1251 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1252
1253 if (sb_any_quota_loaded(s) &&
1254 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1255 reiserfs_warning(s, "super-6511",
1256 "cannot change journaled "
1257 "quota options when quota "
1258 "turned on.");
1259 return 0;
1260 }
1261 if (qf_names[qtype] !=
1262 REISERFS_SB(s)->s_qf_names[qtype])
1263 kfree(qf_names[qtype]);
1264 qf_names[qtype] = NULL;
1265 if (*arg) { /* Some filename specified? */
1266 if (REISERFS_SB(s)->s_qf_names[qtype]
1267 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1268 arg)) {
1269 reiserfs_warning(s, "super-6512",
1270 "%s quota file "
1271 "already specified.",
1272 QTYPE2NAME(qtype));
1273 return 0;
1274 }
1275 if (strchr(arg, '/')) {
1276 reiserfs_warning(s, "super-6513",
1277 "quotafile must be "
1278 "on filesystem root.");
1279 return 0;
1280 }
1281 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1282 if (!qf_names[qtype]) {
1283 reiserfs_warning(s, "reiserfs-2502",
1284 "not enough memory "
1285 "for storing "
1286 "quotafile name.");
1287 return 0;
1288 }
1289 if (qtype == USRQUOTA)
1290 *mount_options |= 1 << REISERFS_USRQUOTA;
1291 else
1292 *mount_options |= 1 << REISERFS_GRPQUOTA;
1293 } else {
1294 if (qtype == USRQUOTA)
1295 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1296 else
1297 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1298 }
1299 }
1300 if (c == 'f') {
1301 if (!strcmp(arg, "vfsold"))
1302 *qfmt = QFMT_VFS_OLD;
1303 else if (!strcmp(arg, "vfsv0"))
1304 *qfmt = QFMT_VFS_V0;
1305 else {
1306 reiserfs_warning(s, "super-6514",
1307 "unknown quota format "
1308 "specified.");
1309 return 0;
1310 }
1311 if (sb_any_quota_loaded(s) &&
1312 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1313 reiserfs_warning(s, "super-6515",
1314 "cannot change journaled "
1315 "quota options when quota "
1316 "turned on.");
1317 return 0;
1318 }
1319 }
1320 #else
1321 if (c == 'u' || c == 'g' || c == 'f') {
1322 reiserfs_warning(s, "reiserfs-2503", "journaled "
1323 "quota options not supported.");
1324 return 0;
1325 }
1326 #endif
1327 }
1328
1329 #ifdef CONFIG_QUOTA
1330 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1331 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1332 reiserfs_warning(s, "super-6515",
1333 "journaled quota format not specified.");
1334 return 0;
1335 }
1336 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1337 sb_has_quota_loaded(s, USRQUOTA)) ||
1338 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1339 sb_has_quota_loaded(s, GRPQUOTA))) {
1340 reiserfs_warning(s, "super-6516", "quota options must "
1341 "be present when quota is turned on.");
1342 return 0;
1343 }
1344 #endif
1345
1346 return 1;
1347 }
1348
switch_data_mode(struct super_block * s,unsigned long mode)1349 static void switch_data_mode(struct super_block *s, unsigned long mode)
1350 {
1351 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1352 (1 << REISERFS_DATA_ORDERED) |
1353 (1 << REISERFS_DATA_WRITEBACK));
1354 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1355 }
1356
handle_data_mode(struct super_block * s,unsigned long mount_options)1357 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1358 {
1359 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1360 if (!reiserfs_data_log(s)) {
1361 switch_data_mode(s, REISERFS_DATA_LOG);
1362 reiserfs_info(s, "switching to journaled data mode\n");
1363 }
1364 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1365 if (!reiserfs_data_ordered(s)) {
1366 switch_data_mode(s, REISERFS_DATA_ORDERED);
1367 reiserfs_info(s, "switching to ordered data mode\n");
1368 }
1369 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1370 if (!reiserfs_data_writeback(s)) {
1371 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1372 reiserfs_info(s, "switching to writeback data mode\n");
1373 }
1374 }
1375 }
1376
handle_barrier_mode(struct super_block * s,unsigned long bits)1377 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1378 {
1379 int flush = (1 << REISERFS_BARRIER_FLUSH);
1380 int none = (1 << REISERFS_BARRIER_NONE);
1381 int all_barrier = flush | none;
1382
1383 if (bits & all_barrier) {
1384 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1385 if (bits & flush) {
1386 REISERFS_SB(s)->s_mount_opt |= flush;
1387 printk("reiserfs: enabling write barrier flush mode\n");
1388 } else if (bits & none) {
1389 REISERFS_SB(s)->s_mount_opt |= none;
1390 printk("reiserfs: write barriers turned off\n");
1391 }
1392 }
1393 }
1394
handle_attrs(struct super_block * s)1395 static void handle_attrs(struct super_block *s)
1396 {
1397 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1398
1399 if (reiserfs_attrs(s)) {
1400 if (old_format_only(s)) {
1401 reiserfs_warning(s, "super-6517", "cannot support "
1402 "attributes on 3.5.x disk format");
1403 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1404 return;
1405 }
1406 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1407 reiserfs_warning(s, "super-6518", "cannot support "
1408 "attributes until flag is set in "
1409 "super-block");
1410 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1411 }
1412 }
1413 }
1414
1415 #ifdef CONFIG_QUOTA
handle_quota_files(struct super_block * s,char ** qf_names,unsigned int * qfmt)1416 static void handle_quota_files(struct super_block *s, char **qf_names,
1417 unsigned int *qfmt)
1418 {
1419 int i;
1420
1421 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1422 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1423 kfree(REISERFS_SB(s)->s_qf_names[i]);
1424 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1425 }
1426 if (*qfmt)
1427 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1428 }
1429 #endif
1430
reiserfs_remount(struct super_block * s,int * mount_flags,char * arg)1431 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1432 {
1433 struct reiserfs_super_block *rs;
1434 struct reiserfs_transaction_handle th;
1435 unsigned long blocks;
1436 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1437 unsigned long safe_mask = 0;
1438 unsigned int commit_max_age = (unsigned int)-1;
1439 struct reiserfs_journal *journal = SB_JOURNAL(s);
1440 int err;
1441 char *qf_names[REISERFS_MAXQUOTAS];
1442 unsigned int qfmt = 0;
1443 #ifdef CONFIG_QUOTA
1444 int i;
1445 #endif
1446
1447 sync_filesystem(s);
1448 reiserfs_write_lock(s);
1449
1450 #ifdef CONFIG_QUOTA
1451 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1452 #endif
1453
1454 rs = SB_DISK_SUPER_BLOCK(s);
1455
1456 if (!reiserfs_parse_options
1457 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1458 qf_names, &qfmt)) {
1459 #ifdef CONFIG_QUOTA
1460 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1461 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1462 kfree(qf_names[i]);
1463 #endif
1464 err = -EINVAL;
1465 goto out_err_unlock;
1466 }
1467 #ifdef CONFIG_QUOTA
1468 handle_quota_files(s, qf_names, &qfmt);
1469 #endif
1470
1471 handle_attrs(s);
1472
1473 /* Add options that are safe here */
1474 safe_mask |= 1 << REISERFS_SMALLTAIL;
1475 safe_mask |= 1 << REISERFS_LARGETAIL;
1476 safe_mask |= 1 << REISERFS_NO_BORDER;
1477 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1478 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1479 safe_mask |= 1 << REISERFS_TEST4;
1480 safe_mask |= 1 << REISERFS_ATTRS;
1481 safe_mask |= 1 << REISERFS_XATTRS_USER;
1482 safe_mask |= 1 << REISERFS_POSIXACL;
1483 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1484 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1485 safe_mask |= 1 << REISERFS_ERROR_RO;
1486 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1487 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1488 safe_mask |= 1 << REISERFS_USRQUOTA;
1489 safe_mask |= 1 << REISERFS_GRPQUOTA;
1490
1491 /*
1492 * Update the bitmask, taking care to keep
1493 * the bits we're not allowed to change here
1494 */
1495 REISERFS_SB(s)->s_mount_opt =
1496 (REISERFS_SB(s)->
1497 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1498
1499 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1500 journal->j_max_commit_age = commit_max_age;
1501 journal->j_max_trans_age = commit_max_age;
1502 } else if (commit_max_age == 0) {
1503 /* 0 means restore defaults. */
1504 journal->j_max_commit_age = journal->j_default_max_commit_age;
1505 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1506 }
1507
1508 if (blocks) {
1509 err = reiserfs_resize(s, blocks);
1510 if (err != 0)
1511 goto out_err_unlock;
1512 }
1513
1514 if (*mount_flags & SB_RDONLY) {
1515 reiserfs_write_unlock(s);
1516 reiserfs_xattr_init(s, *mount_flags);
1517 /* remount read-only */
1518 if (sb_rdonly(s))
1519 /* it is read-only already */
1520 goto out_ok_unlocked;
1521
1522 err = dquot_suspend(s, -1);
1523 if (err < 0)
1524 goto out_err;
1525
1526 /* try to remount file system with read-only permissions */
1527 if (sb_umount_state(rs) == REISERFS_VALID_FS
1528 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1529 goto out_ok_unlocked;
1530 }
1531
1532 reiserfs_write_lock(s);
1533
1534 err = journal_begin(&th, s, 10);
1535 if (err)
1536 goto out_err_unlock;
1537
1538 /* Mounting a rw partition read-only. */
1539 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1540 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1541 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1542 } else {
1543 /* remount read-write */
1544 if (!sb_rdonly(s)) {
1545 reiserfs_write_unlock(s);
1546 reiserfs_xattr_init(s, *mount_flags);
1547 goto out_ok_unlocked; /* We are read-write already */
1548 }
1549
1550 if (reiserfs_is_journal_aborted(journal)) {
1551 err = journal->j_errno;
1552 goto out_err_unlock;
1553 }
1554
1555 handle_data_mode(s, mount_options);
1556 handle_barrier_mode(s, mount_options);
1557 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1558
1559 /* now it is safe to call journal_begin */
1560 s->s_flags &= ~SB_RDONLY;
1561 err = journal_begin(&th, s, 10);
1562 if (err)
1563 goto out_err_unlock;
1564
1565 /* Mount a partition which is read-only, read-write */
1566 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1567 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1568 s->s_flags &= ~SB_RDONLY;
1569 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1570 if (!old_format_only(s))
1571 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1572 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1573 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1574 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1575 }
1576 /* this will force a full flush of all journal lists */
1577 SB_JOURNAL(s)->j_must_wait = 1;
1578 err = journal_end(&th);
1579 if (err)
1580 goto out_err_unlock;
1581
1582 reiserfs_write_unlock(s);
1583 if (!(*mount_flags & SB_RDONLY)) {
1584 dquot_resume(s, -1);
1585 reiserfs_write_lock(s);
1586 finish_unfinished(s);
1587 reiserfs_write_unlock(s);
1588 reiserfs_xattr_init(s, *mount_flags);
1589 }
1590
1591 out_ok_unlocked:
1592 return 0;
1593
1594 out_err_unlock:
1595 reiserfs_write_unlock(s);
1596 out_err:
1597 return err;
1598 }
1599
read_super_block(struct super_block * s,int offset)1600 static int read_super_block(struct super_block *s, int offset)
1601 {
1602 struct buffer_head *bh;
1603 struct reiserfs_super_block *rs;
1604 int fs_blocksize;
1605
1606 bh = sb_bread(s, offset / s->s_blocksize);
1607 if (!bh) {
1608 reiserfs_warning(s, "sh-2006",
1609 "bread failed (dev %s, block %lu, size %lu)",
1610 s->s_id, offset / s->s_blocksize,
1611 s->s_blocksize);
1612 return 1;
1613 }
1614
1615 rs = (struct reiserfs_super_block *)bh->b_data;
1616 if (!is_any_reiserfs_magic_string(rs)) {
1617 brelse(bh);
1618 return 1;
1619 }
1620 /*
1621 * ok, reiserfs signature (old or new) found in at the given offset
1622 */
1623 fs_blocksize = sb_blocksize(rs);
1624 brelse(bh);
1625 sb_set_blocksize(s, fs_blocksize);
1626
1627 bh = sb_bread(s, offset / s->s_blocksize);
1628 if (!bh) {
1629 reiserfs_warning(s, "sh-2007",
1630 "bread failed (dev %s, block %lu, size %lu)",
1631 s->s_id, offset / s->s_blocksize,
1632 s->s_blocksize);
1633 return 1;
1634 }
1635
1636 rs = (struct reiserfs_super_block *)bh->b_data;
1637 if (sb_blocksize(rs) != s->s_blocksize) {
1638 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1639 "filesystem on (dev %s, block %llu, size %lu)",
1640 s->s_id,
1641 (unsigned long long)bh->b_blocknr,
1642 s->s_blocksize);
1643 brelse(bh);
1644 return 1;
1645 }
1646
1647 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1648 brelse(bh);
1649 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1650 "--rebuild-tree run detected. Please run\n"
1651 "reiserfsck --rebuild-tree and wait for a "
1652 "completion. If that fails\n"
1653 "get newer reiserfsprogs package");
1654 return 1;
1655 }
1656
1657 SB_BUFFER_WITH_SB(s) = bh;
1658 SB_DISK_SUPER_BLOCK(s) = rs;
1659
1660 /*
1661 * magic is of non-standard journal filesystem, look at s_version to
1662 * find which format is in use
1663 */
1664 if (is_reiserfs_jr(rs)) {
1665 if (sb_version(rs) == REISERFS_VERSION_2)
1666 reiserfs_info(s, "found reiserfs format \"3.6\""
1667 " with non-standard journal\n");
1668 else if (sb_version(rs) == REISERFS_VERSION_1)
1669 reiserfs_info(s, "found reiserfs format \"3.5\""
1670 " with non-standard journal\n");
1671 else {
1672 reiserfs_warning(s, "sh-2012", "found unknown "
1673 "format \"%u\" of reiserfs with "
1674 "non-standard magic", sb_version(rs));
1675 return 1;
1676 }
1677 } else
1678 /*
1679 * s_version of standard format may contain incorrect
1680 * information, so we just look at the magic string
1681 */
1682 reiserfs_info(s,
1683 "found reiserfs format \"%s\" with standard journal\n",
1684 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1685
1686 s->s_op = &reiserfs_sops;
1687 s->s_export_op = &reiserfs_export_ops;
1688 #ifdef CONFIG_QUOTA
1689 s->s_qcop = &reiserfs_qctl_operations;
1690 s->dq_op = &reiserfs_quota_operations;
1691 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1692 #endif
1693
1694 /*
1695 * new format is limited by the 32 bit wide i_blocks field, want to
1696 * be one full block below that.
1697 */
1698 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1699 return 0;
1700 }
1701
1702 /* after journal replay, reread all bitmap and super blocks */
reread_meta_blocks(struct super_block * s)1703 static int reread_meta_blocks(struct super_block *s)
1704 {
1705 ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1706 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1707 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1708 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1709 return 1;
1710 }
1711
1712 return 0;
1713 }
1714
1715 /* hash detection stuff */
1716
1717 /*
1718 * if root directory is empty - we set default - Yura's - hash and
1719 * warn about it
1720 * FIXME: we look for only one name in a directory. If tea and yura
1721 * both have the same value - we ask user to send report to the
1722 * mailing list
1723 */
find_hash_out(struct super_block * s)1724 static __u32 find_hash_out(struct super_block *s)
1725 {
1726 int retval;
1727 struct inode *inode;
1728 struct cpu_key key;
1729 INITIALIZE_PATH(path);
1730 struct reiserfs_dir_entry de;
1731 struct reiserfs_de_head *deh;
1732 __u32 hash = DEFAULT_HASH;
1733 __u32 deh_hashval, teahash, r5hash, yurahash;
1734
1735 inode = d_inode(s->s_root);
1736
1737 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1738 retval = search_by_entry_key(s, &key, &path, &de);
1739 if (retval == IO_ERROR) {
1740 pathrelse(&path);
1741 return UNSET_HASH;
1742 }
1743 if (retval == NAME_NOT_FOUND)
1744 de.de_entry_num--;
1745
1746 set_de_name_and_namelen(&de);
1747 deh = de.de_deh + de.de_entry_num;
1748
1749 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1750 /* allow override in this case */
1751 if (reiserfs_rupasov_hash(s))
1752 hash = YURA_HASH;
1753 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1754 goto out;
1755 }
1756
1757 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1758 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1759 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1760 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1761
1762 if ((teahash == r5hash && deh_hashval == r5hash) ||
1763 (teahash == yurahash && deh_hashval == yurahash) ||
1764 (r5hash == yurahash && deh_hashval == yurahash)) {
1765 reiserfs_warning(s, "reiserfs-2506",
1766 "Unable to automatically detect hash "
1767 "function. Please mount with -o "
1768 "hash={tea,rupasov,r5}");
1769 hash = UNSET_HASH;
1770 goto out;
1771 }
1772
1773 if (deh_hashval == yurahash)
1774 hash = YURA_HASH;
1775 else if (deh_hashval == teahash)
1776 hash = TEA_HASH;
1777 else if (deh_hashval == r5hash)
1778 hash = R5_HASH;
1779 else {
1780 reiserfs_warning(s, "reiserfs-2506",
1781 "Unrecognised hash function");
1782 hash = UNSET_HASH;
1783 }
1784 out:
1785 pathrelse(&path);
1786 return hash;
1787 }
1788
1789 /* finds out which hash names are sorted with */
what_hash(struct super_block * s)1790 static int what_hash(struct super_block *s)
1791 {
1792 __u32 code;
1793
1794 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1795
1796 /*
1797 * reiserfs_hash_detect() == true if any of the hash mount options
1798 * were used. We must check them to make sure the user isn't
1799 * using a bad hash value
1800 */
1801 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1802 code = find_hash_out(s);
1803
1804 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1805 /*
1806 * detection has found the hash, and we must check against the
1807 * mount options
1808 */
1809 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1810 reiserfs_warning(s, "reiserfs-2507",
1811 "Error, %s hash detected, "
1812 "unable to force rupasov hash",
1813 reiserfs_hashname(code));
1814 code = UNSET_HASH;
1815 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1816 reiserfs_warning(s, "reiserfs-2508",
1817 "Error, %s hash detected, "
1818 "unable to force tea hash",
1819 reiserfs_hashname(code));
1820 code = UNSET_HASH;
1821 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1822 reiserfs_warning(s, "reiserfs-2509",
1823 "Error, %s hash detected, "
1824 "unable to force r5 hash",
1825 reiserfs_hashname(code));
1826 code = UNSET_HASH;
1827 }
1828 } else {
1829 /*
1830 * find_hash_out was not called or
1831 * could not determine the hash
1832 */
1833 if (reiserfs_rupasov_hash(s)) {
1834 code = YURA_HASH;
1835 } else if (reiserfs_tea_hash(s)) {
1836 code = TEA_HASH;
1837 } else if (reiserfs_r5_hash(s)) {
1838 code = R5_HASH;
1839 }
1840 }
1841
1842 /*
1843 * if we are mounted RW, and we have a new valid hash code, update
1844 * the super
1845 */
1846 if (code != UNSET_HASH &&
1847 !sb_rdonly(s) &&
1848 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1849 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1850 }
1851 return code;
1852 }
1853
1854 /* return pointer to appropriate function */
hash_function(struct super_block * s)1855 static hashf_t hash_function(struct super_block *s)
1856 {
1857 switch (what_hash(s)) {
1858 case TEA_HASH:
1859 reiserfs_info(s, "Using tea hash to sort names\n");
1860 return keyed_hash;
1861 case YURA_HASH:
1862 reiserfs_info(s, "Using rupasov hash to sort names\n");
1863 return yura_hash;
1864 case R5_HASH:
1865 reiserfs_info(s, "Using r5 hash to sort names\n");
1866 return r5_hash;
1867 }
1868 return NULL;
1869 }
1870
1871 /* this is used to set up correct value for old partitions */
function2code(hashf_t func)1872 static int function2code(hashf_t func)
1873 {
1874 if (func == keyed_hash)
1875 return TEA_HASH;
1876 if (func == yura_hash)
1877 return YURA_HASH;
1878 if (func == r5_hash)
1879 return R5_HASH;
1880
1881 BUG(); /* should never happen */
1882
1883 return 0;
1884 }
1885
1886 #define SWARN(silent, s, id, ...) \
1887 if (!(silent)) \
1888 reiserfs_warning(s, id, __VA_ARGS__)
1889
reiserfs_fill_super(struct super_block * s,void * data,int silent)1890 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1891 {
1892 struct inode *root_inode;
1893 struct reiserfs_transaction_handle th;
1894 int old_format = 0;
1895 unsigned long blocks;
1896 unsigned int commit_max_age = 0;
1897 int jinit_done = 0;
1898 struct reiserfs_iget_args args;
1899 struct reiserfs_super_block *rs;
1900 char *jdev_name;
1901 struct reiserfs_sb_info *sbi;
1902 int errval = -EINVAL;
1903 char *qf_names[REISERFS_MAXQUOTAS] = {};
1904 unsigned int qfmt = 0;
1905
1906 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1907 if (!sbi)
1908 return -ENOMEM;
1909 s->s_fs_info = sbi;
1910 /* Set default values for options: non-aggressive tails, RO on errors */
1911 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1912 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1913 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1914 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1915 sbi->s_alloc_options.preallocmin = 0;
1916 /* Preallocate by 16 blocks (17-1) at once */
1917 sbi->s_alloc_options.preallocsize = 17;
1918 /* setup default block allocator options */
1919 reiserfs_init_alloc_options(s);
1920
1921 spin_lock_init(&sbi->old_work_lock);
1922 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1923 mutex_init(&sbi->lock);
1924 sbi->lock_depth = -1;
1925
1926 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1927 s->s_id);
1928 if (!sbi->commit_wq) {
1929 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1930 errval = -ENOMEM;
1931 goto error_unlocked;
1932 }
1933
1934 jdev_name = NULL;
1935 if (reiserfs_parse_options
1936 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1937 &commit_max_age, qf_names, &qfmt) == 0) {
1938 goto error_unlocked;
1939 }
1940 if (jdev_name && jdev_name[0]) {
1941 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1942 if (!sbi->s_jdev) {
1943 SWARN(silent, s, "", "Cannot allocate memory for "
1944 "journal device name");
1945 goto error_unlocked;
1946 }
1947 }
1948 #ifdef CONFIG_QUOTA
1949 handle_quota_files(s, qf_names, &qfmt);
1950 #endif
1951
1952 if (blocks) {
1953 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1954 goto error_unlocked;
1955 }
1956
1957 /*
1958 * try old format (undistributed bitmap, super block in 8-th 1k
1959 * block of a device)
1960 */
1961 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1962 old_format = 1;
1963
1964 /*
1965 * try new format (64-th 1k block), which can contain reiserfs
1966 * super block
1967 */
1968 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1969 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1970 s->s_id);
1971 goto error_unlocked;
1972 }
1973
1974 s->s_time_min = 0;
1975 s->s_time_max = U32_MAX;
1976
1977 rs = SB_DISK_SUPER_BLOCK(s);
1978 /*
1979 * Let's do basic sanity check to verify that underlying device is not
1980 * smaller than the filesystem. If the check fails then abort and
1981 * scream, because bad stuff will happen otherwise.
1982 */
1983 if (s->s_bdev && s->s_bdev->bd_inode
1984 && i_size_read(s->s_bdev->bd_inode) <
1985 sb_block_count(rs) * sb_blocksize(rs)) {
1986 SWARN(silent, s, "", "Filesystem cannot be "
1987 "mounted because it is bigger than the device");
1988 SWARN(silent, s, "", "You may need to run fsck "
1989 "or increase size of your LVM partition");
1990 SWARN(silent, s, "", "Or may be you forgot to "
1991 "reboot after fdisk when it told you to");
1992 goto error_unlocked;
1993 }
1994
1995 sbi->s_mount_state = SB_REISERFS_STATE(s);
1996 sbi->s_mount_state = REISERFS_VALID_FS;
1997
1998 if ((errval = reiserfs_init_bitmap_cache(s))) {
1999 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2000 goto error_unlocked;
2001 }
2002
2003 errval = -EINVAL;
2004 #ifdef CONFIG_REISERFS_CHECK
2005 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2006 SWARN(silent, s, "", "- it is slow mode for debugging.");
2007 #endif
2008
2009 /* make data=ordered the default */
2010 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2011 !reiserfs_data_writeback(s)) {
2012 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2013 }
2014
2015 if (reiserfs_data_log(s)) {
2016 reiserfs_info(s, "using journaled data mode\n");
2017 } else if (reiserfs_data_ordered(s)) {
2018 reiserfs_info(s, "using ordered data mode\n");
2019 } else {
2020 reiserfs_info(s, "using writeback data mode\n");
2021 }
2022 if (reiserfs_barrier_flush(s)) {
2023 printk("reiserfs: using flush barriers\n");
2024 }
2025
2026 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2027 SWARN(silent, s, "sh-2022",
2028 "unable to initialize journal space");
2029 goto error_unlocked;
2030 } else {
2031 /*
2032 * once this is set, journal_release must be called
2033 * if we error out of the mount
2034 */
2035 jinit_done = 1;
2036 }
2037
2038 if (reread_meta_blocks(s)) {
2039 SWARN(silent, s, "jmacd-9",
2040 "unable to reread meta blocks after journal init");
2041 goto error_unlocked;
2042 }
2043
2044 if (replay_only(s))
2045 goto error_unlocked;
2046
2047 s->s_xattr = reiserfs_xattr_handlers;
2048
2049 if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2050 SWARN(silent, s, "clm-7000",
2051 "Detected readonly device, marking FS readonly");
2052 s->s_flags |= SB_RDONLY;
2053 }
2054 args.objectid = REISERFS_ROOT_OBJECTID;
2055 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2056 root_inode =
2057 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2058 reiserfs_init_locked_inode, (void *)&args);
2059 if (!root_inode) {
2060 SWARN(silent, s, "jmacd-10", "get root inode failed");
2061 goto error_unlocked;
2062 }
2063
2064 /*
2065 * This path assumed to be called with the BKL in the old times.
2066 * Now we have inherited the big reiserfs lock from it and many
2067 * reiserfs helpers called in the mount path and elsewhere require
2068 * this lock to be held even if it's not always necessary. Let's be
2069 * conservative and hold it early. The window can be reduced after
2070 * careful review of the code.
2071 */
2072 reiserfs_write_lock(s);
2073
2074 if (root_inode->i_state & I_NEW) {
2075 reiserfs_read_locked_inode(root_inode, &args);
2076 unlock_new_inode(root_inode);
2077 }
2078
2079 if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2080 !root_inode->i_size) {
2081 SWARN(silent, s, "", "corrupt root inode, run fsck");
2082 iput(root_inode);
2083 errval = -EUCLEAN;
2084 goto error;
2085 }
2086
2087 s->s_root = d_make_root(root_inode);
2088 if (!s->s_root)
2089 goto error;
2090 /* define and initialize hash function */
2091 sbi->s_hash_function = hash_function(s);
2092 if (sbi->s_hash_function == NULL) {
2093 dput(s->s_root);
2094 s->s_root = NULL;
2095 goto error;
2096 }
2097
2098 if (is_reiserfs_3_5(rs)
2099 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2100 set_bit(REISERFS_3_5, &sbi->s_properties);
2101 else if (old_format)
2102 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2103 else
2104 set_bit(REISERFS_3_6, &sbi->s_properties);
2105
2106 if (!sb_rdonly(s)) {
2107
2108 errval = journal_begin(&th, s, 1);
2109 if (errval) {
2110 dput(s->s_root);
2111 s->s_root = NULL;
2112 goto error;
2113 }
2114 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2115
2116 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2117 set_sb_fs_state(rs, 0);
2118
2119 /*
2120 * Clear out s_bmap_nr if it would wrap. We can handle this
2121 * case, but older revisions can't. This will cause the
2122 * file system to fail mount on those older implementations,
2123 * avoiding corruption. -jeffm
2124 */
2125 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2126 sb_bmap_nr(rs) != 0) {
2127 reiserfs_warning(s, "super-2030", "This file system "
2128 "claims to use %u bitmap blocks in "
2129 "its super block, but requires %u. "
2130 "Clearing to zero.", sb_bmap_nr(rs),
2131 reiserfs_bmap_count(s));
2132
2133 set_sb_bmap_nr(rs, 0);
2134 }
2135
2136 if (old_format_only(s)) {
2137 /*
2138 * filesystem of format 3.5 either with standard
2139 * or non-standard journal
2140 */
2141 if (convert_reiserfs(s)) {
2142 /* and -o conv is given */
2143 if (!silent)
2144 reiserfs_info(s,
2145 "converting 3.5 filesystem to the 3.6 format");
2146
2147 if (is_reiserfs_3_5(rs))
2148 /*
2149 * put magic string of 3.6 format.
2150 * 2.2 will not be able to
2151 * mount this filesystem anymore
2152 */
2153 memcpy(rs->s_v1.s_magic,
2154 reiserfs_3_6_magic_string,
2155 sizeof
2156 (reiserfs_3_6_magic_string));
2157
2158 set_sb_version(rs, REISERFS_VERSION_2);
2159 reiserfs_convert_objectid_map_v1(s);
2160 set_bit(REISERFS_3_6, &sbi->s_properties);
2161 clear_bit(REISERFS_3_5, &sbi->s_properties);
2162 } else if (!silent) {
2163 reiserfs_info(s, "using 3.5.x disk format\n");
2164 }
2165 } else
2166 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2167
2168
2169 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2170 errval = journal_end(&th);
2171 if (errval) {
2172 dput(s->s_root);
2173 s->s_root = NULL;
2174 goto error;
2175 }
2176
2177 reiserfs_write_unlock(s);
2178 if ((errval = reiserfs_lookup_privroot(s)) ||
2179 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2180 dput(s->s_root);
2181 s->s_root = NULL;
2182 goto error_unlocked;
2183 }
2184 reiserfs_write_lock(s);
2185
2186 /*
2187 * look for files which were to be removed in previous session
2188 */
2189 finish_unfinished(s);
2190 } else {
2191 if (old_format_only(s) && !silent) {
2192 reiserfs_info(s, "using 3.5.x disk format\n");
2193 }
2194
2195 reiserfs_write_unlock(s);
2196 if ((errval = reiserfs_lookup_privroot(s)) ||
2197 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2198 dput(s->s_root);
2199 s->s_root = NULL;
2200 goto error_unlocked;
2201 }
2202 reiserfs_write_lock(s);
2203 }
2204 /*
2205 * mark hash in super block: it could be unset. overwrite should be ok
2206 */
2207 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2208
2209 handle_attrs(s);
2210
2211 reiserfs_proc_info_init(s);
2212
2213 init_waitqueue_head(&(sbi->s_wait));
2214 spin_lock_init(&sbi->bitmap_lock);
2215
2216 reiserfs_write_unlock(s);
2217
2218 return (0);
2219
2220 error:
2221 reiserfs_write_unlock(s);
2222
2223 error_unlocked:
2224 /* kill the commit thread, free journal ram */
2225 if (jinit_done) {
2226 reiserfs_write_lock(s);
2227 journal_release_error(NULL, s);
2228 reiserfs_write_unlock(s);
2229 }
2230
2231 if (sbi->commit_wq)
2232 destroy_workqueue(sbi->commit_wq);
2233
2234 reiserfs_cancel_old_flush(s);
2235
2236 reiserfs_free_bitmap_cache(s);
2237 if (SB_BUFFER_WITH_SB(s))
2238 brelse(SB_BUFFER_WITH_SB(s));
2239 #ifdef CONFIG_QUOTA
2240 {
2241 int j;
2242 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2243 kfree(qf_names[j]);
2244 }
2245 #endif
2246 kfree(sbi->s_jdev);
2247 kfree(sbi);
2248
2249 s->s_fs_info = NULL;
2250 return errval;
2251 }
2252
reiserfs_statfs(struct dentry * dentry,struct kstatfs * buf)2253 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2254 {
2255 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2256
2257 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2258 buf->f_bfree = sb_free_blocks(rs);
2259 buf->f_bavail = buf->f_bfree;
2260 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2261 buf->f_bsize = dentry->d_sb->s_blocksize;
2262 /* changed to accommodate gcc folks. */
2263 buf->f_type = REISERFS_SUPER_MAGIC;
2264 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2265 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2266 sizeof(rs->s_uuid)/2);
2267
2268 return 0;
2269 }
2270
2271 #ifdef CONFIG_QUOTA
reiserfs_write_dquot(struct dquot * dquot)2272 static int reiserfs_write_dquot(struct dquot *dquot)
2273 {
2274 struct reiserfs_transaction_handle th;
2275 int ret, err;
2276 int depth;
2277
2278 reiserfs_write_lock(dquot->dq_sb);
2279 ret =
2280 journal_begin(&th, dquot->dq_sb,
2281 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2282 if (ret)
2283 goto out;
2284 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2285 ret = dquot_commit(dquot);
2286 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2287 err = journal_end(&th);
2288 if (!ret && err)
2289 ret = err;
2290 out:
2291 reiserfs_write_unlock(dquot->dq_sb);
2292 return ret;
2293 }
2294
reiserfs_acquire_dquot(struct dquot * dquot)2295 static int reiserfs_acquire_dquot(struct dquot *dquot)
2296 {
2297 struct reiserfs_transaction_handle th;
2298 int ret, err;
2299 int depth;
2300
2301 reiserfs_write_lock(dquot->dq_sb);
2302 ret =
2303 journal_begin(&th, dquot->dq_sb,
2304 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2305 if (ret)
2306 goto out;
2307 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2308 ret = dquot_acquire(dquot);
2309 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2310 err = journal_end(&th);
2311 if (!ret && err)
2312 ret = err;
2313 out:
2314 reiserfs_write_unlock(dquot->dq_sb);
2315 return ret;
2316 }
2317
reiserfs_release_dquot(struct dquot * dquot)2318 static int reiserfs_release_dquot(struct dquot *dquot)
2319 {
2320 struct reiserfs_transaction_handle th;
2321 int ret, err;
2322
2323 reiserfs_write_lock(dquot->dq_sb);
2324 ret =
2325 journal_begin(&th, dquot->dq_sb,
2326 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2327 reiserfs_write_unlock(dquot->dq_sb);
2328 if (ret) {
2329 /* Release dquot anyway to avoid endless cycle in dqput() */
2330 dquot_release(dquot);
2331 goto out;
2332 }
2333 ret = dquot_release(dquot);
2334 reiserfs_write_lock(dquot->dq_sb);
2335 err = journal_end(&th);
2336 if (!ret && err)
2337 ret = err;
2338 reiserfs_write_unlock(dquot->dq_sb);
2339 out:
2340 return ret;
2341 }
2342
reiserfs_mark_dquot_dirty(struct dquot * dquot)2343 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2344 {
2345 /* Are we journaling quotas? */
2346 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2347 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2348 dquot_mark_dquot_dirty(dquot);
2349 return reiserfs_write_dquot(dquot);
2350 } else
2351 return dquot_mark_dquot_dirty(dquot);
2352 }
2353
reiserfs_write_info(struct super_block * sb,int type)2354 static int reiserfs_write_info(struct super_block *sb, int type)
2355 {
2356 struct reiserfs_transaction_handle th;
2357 int ret, err;
2358 int depth;
2359
2360 /* Data block + inode block */
2361 reiserfs_write_lock(sb);
2362 ret = journal_begin(&th, sb, 2);
2363 if (ret)
2364 goto out;
2365 depth = reiserfs_write_unlock_nested(sb);
2366 ret = dquot_commit_info(sb, type);
2367 reiserfs_write_lock_nested(sb, depth);
2368 err = journal_end(&th);
2369 if (!ret && err)
2370 ret = err;
2371 out:
2372 reiserfs_write_unlock(sb);
2373 return ret;
2374 }
2375
2376 /*
2377 * Turn on quotas during mount time - we need to find the quota file and such...
2378 */
reiserfs_quota_on_mount(struct super_block * sb,int type)2379 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2380 {
2381 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2382 REISERFS_SB(sb)->s_jquota_fmt, type);
2383 }
2384
2385 /*
2386 * Standard function to be called on quota_on
2387 */
reiserfs_quota_on(struct super_block * sb,int type,int format_id,const struct path * path)2388 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2389 const struct path *path)
2390 {
2391 int err;
2392 struct inode *inode;
2393 struct reiserfs_transaction_handle th;
2394 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2395
2396 reiserfs_write_lock(sb);
2397 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2398 err = -EINVAL;
2399 goto out;
2400 }
2401
2402 /* Quotafile not on the same filesystem? */
2403 if (path->dentry->d_sb != sb) {
2404 err = -EXDEV;
2405 goto out;
2406 }
2407 inode = d_inode(path->dentry);
2408 /*
2409 * We must not pack tails for quota files on reiserfs for quota
2410 * IO to work
2411 */
2412 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2413 err = reiserfs_unpack(inode);
2414 if (err) {
2415 reiserfs_warning(sb, "super-6520",
2416 "Unpacking tail of quota file failed"
2417 " (%d). Cannot turn on quotas.", err);
2418 err = -EINVAL;
2419 goto out;
2420 }
2421 mark_inode_dirty(inode);
2422 }
2423 /* Journaling quota? */
2424 if (REISERFS_SB(sb)->s_qf_names[type]) {
2425 /* Quotafile not of fs root? */
2426 if (path->dentry->d_parent != sb->s_root)
2427 reiserfs_warning(sb, "super-6521",
2428 "Quota file not on filesystem root. "
2429 "Journalled quota will not work.");
2430 }
2431
2432 /*
2433 * When we journal data on quota file, we have to flush journal to see
2434 * all updates to the file when we bypass pagecache...
2435 */
2436 if (reiserfs_file_data_log(inode)) {
2437 /* Just start temporary transaction and finish it */
2438 err = journal_begin(&th, sb, 1);
2439 if (err)
2440 goto out;
2441 err = journal_end_sync(&th);
2442 if (err)
2443 goto out;
2444 }
2445 reiserfs_write_unlock(sb);
2446 err = dquot_quota_on(sb, type, format_id, path);
2447 if (!err) {
2448 inode_lock(inode);
2449 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2450 REISERFS_NOATIME_FL;
2451 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2452 S_IMMUTABLE | S_NOATIME);
2453 inode_unlock(inode);
2454 mark_inode_dirty(inode);
2455 }
2456 return err;
2457 out:
2458 reiserfs_write_unlock(sb);
2459 return err;
2460 }
2461
reiserfs_quota_off(struct super_block * sb,int type)2462 static int reiserfs_quota_off(struct super_block *sb, int type)
2463 {
2464 int err;
2465 struct inode *inode = sb_dqopt(sb)->files[type];
2466
2467 if (!inode || !igrab(inode))
2468 goto out;
2469
2470 err = dquot_quota_off(sb, type);
2471 if (err)
2472 goto out_put;
2473
2474 inode_lock(inode);
2475 REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2476 REISERFS_NOATIME_FL);
2477 inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2478 inode_unlock(inode);
2479 mark_inode_dirty(inode);
2480 out_put:
2481 iput(inode);
2482 return err;
2483 out:
2484 return dquot_quota_off(sb, type);
2485 }
2486
2487 /*
2488 * Read data from quotafile - avoid pagecache and such because we cannot afford
2489 * acquiring the locks... As quota files are never truncated and quota code
2490 * itself serializes the operations (and no one else should touch the files)
2491 * we don't have to be afraid of races
2492 */
reiserfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)2493 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2494 size_t len, loff_t off)
2495 {
2496 struct inode *inode = sb_dqopt(sb)->files[type];
2497 unsigned long blk = off >> sb->s_blocksize_bits;
2498 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2499 size_t toread;
2500 struct buffer_head tmp_bh, *bh;
2501 loff_t i_size = i_size_read(inode);
2502
2503 if (off > i_size)
2504 return 0;
2505 if (off + len > i_size)
2506 len = i_size - off;
2507 toread = len;
2508 while (toread > 0) {
2509 tocopy =
2510 sb->s_blocksize - offset <
2511 toread ? sb->s_blocksize - offset : toread;
2512 tmp_bh.b_state = 0;
2513 /*
2514 * Quota files are without tails so we can safely
2515 * use this function
2516 */
2517 reiserfs_write_lock(sb);
2518 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2519 reiserfs_write_unlock(sb);
2520 if (err)
2521 return err;
2522 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2523 memset(data, 0, tocopy);
2524 else {
2525 bh = sb_bread(sb, tmp_bh.b_blocknr);
2526 if (!bh)
2527 return -EIO;
2528 memcpy(data, bh->b_data + offset, tocopy);
2529 brelse(bh);
2530 }
2531 offset = 0;
2532 toread -= tocopy;
2533 data += tocopy;
2534 blk++;
2535 }
2536 return len;
2537 }
2538
2539 /*
2540 * Write to quotafile (we know the transaction is already started and has
2541 * enough credits)
2542 */
reiserfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)2543 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2544 const char *data, size_t len, loff_t off)
2545 {
2546 struct inode *inode = sb_dqopt(sb)->files[type];
2547 unsigned long blk = off >> sb->s_blocksize_bits;
2548 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2549 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2550 size_t towrite = len;
2551 struct buffer_head tmp_bh, *bh;
2552
2553 if (!current->journal_info) {
2554 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2555 (unsigned long long)off, (unsigned long long)len);
2556 return -EIO;
2557 }
2558 while (towrite > 0) {
2559 tocopy = sb->s_blocksize - offset < towrite ?
2560 sb->s_blocksize - offset : towrite;
2561 tmp_bh.b_state = 0;
2562 reiserfs_write_lock(sb);
2563 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2564 reiserfs_write_unlock(sb);
2565 if (err)
2566 goto out;
2567 if (offset || tocopy != sb->s_blocksize)
2568 bh = sb_bread(sb, tmp_bh.b_blocknr);
2569 else
2570 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2571 if (!bh) {
2572 err = -EIO;
2573 goto out;
2574 }
2575 lock_buffer(bh);
2576 memcpy(bh->b_data + offset, data, tocopy);
2577 flush_dcache_page(bh->b_page);
2578 set_buffer_uptodate(bh);
2579 unlock_buffer(bh);
2580 reiserfs_write_lock(sb);
2581 reiserfs_prepare_for_journal(sb, bh, 1);
2582 journal_mark_dirty(current->journal_info, bh);
2583 if (!journal_quota)
2584 reiserfs_add_ordered_list(inode, bh);
2585 reiserfs_write_unlock(sb);
2586 brelse(bh);
2587 offset = 0;
2588 towrite -= tocopy;
2589 data += tocopy;
2590 blk++;
2591 }
2592 out:
2593 if (len == towrite)
2594 return err;
2595 if (inode->i_size < off + len - towrite)
2596 i_size_write(inode, off + len - towrite);
2597 inode->i_mtime = inode->i_ctime = current_time(inode);
2598 mark_inode_dirty(inode);
2599 return len - towrite;
2600 }
2601
2602 #endif
2603
get_super_block(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)2604 static struct dentry *get_super_block(struct file_system_type *fs_type,
2605 int flags, const char *dev_name,
2606 void *data)
2607 {
2608 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2609 }
2610
init_reiserfs_fs(void)2611 static int __init init_reiserfs_fs(void)
2612 {
2613 int ret;
2614
2615 ret = init_inodecache();
2616 if (ret)
2617 return ret;
2618
2619 reiserfs_proc_info_global_init();
2620
2621 ret = register_filesystem(&reiserfs_fs_type);
2622 if (ret)
2623 goto out;
2624
2625 return 0;
2626 out:
2627 reiserfs_proc_info_global_done();
2628 destroy_inodecache();
2629
2630 return ret;
2631 }
2632
exit_reiserfs_fs(void)2633 static void __exit exit_reiserfs_fs(void)
2634 {
2635 reiserfs_proc_info_global_done();
2636 unregister_filesystem(&reiserfs_fs_type);
2637 destroy_inodecache();
2638 }
2639
2640 struct file_system_type reiserfs_fs_type = {
2641 .owner = THIS_MODULE,
2642 .name = "reiserfs",
2643 .mount = get_super_block,
2644 .kill_sb = reiserfs_kill_sb,
2645 .fs_flags = FS_REQUIRES_DEV,
2646 };
2647 MODULE_ALIAS_FS("reiserfs");
2648
2649 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2650 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2651 MODULE_LICENSE("GPL");
2652 MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
2653
2654 module_init(init_reiserfs_fs);
2655 module_exit(exit_reiserfs_fs);
2656