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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
34struct file_system_type reiserfs_fs_type;
35
36static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
40int 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
46int 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
52int 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
58static 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
64static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66
67static 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
84static 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
115void 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
136void 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
147static 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
170static 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
182extern 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 */
193static 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
213static 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 */
225static 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 */
429void 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 */
510int 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
550static 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
574static int reiserfs_quota_off(struct super_block *sb, int type);
575
576static 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
584static inline void reiserfs_quota_off_umount(struct super_block *s)
585{
586}
587#endif
588
589static 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(s->s_fs_info);
633 s->s_fs_info = NULL;
634}
635
636static struct kmem_cache *reiserfs_inode_cachep;
637
638static struct inode *reiserfs_alloc_inode(struct super_block *sb)
639{
640 struct reiserfs_inode_info *ei;
641 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
642 if (!ei)
643 return NULL;
644 atomic_set(&ei->openers, 0);
645 mutex_init(&ei->tailpack);
646#ifdef CONFIG_QUOTA
647 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
648#endif
649
650 return &ei->vfs_inode;
651}
652
653static void reiserfs_free_inode(struct inode *inode)
654{
655 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
656}
657
658static void init_once(void *foo)
659{
660 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
661
662 INIT_LIST_HEAD(&ei->i_prealloc_list);
663 inode_init_once(&ei->vfs_inode);
664}
665
666static int __init init_inodecache(void)
667{
668 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
669 sizeof(struct
670 reiserfs_inode_info),
671 0, (SLAB_RECLAIM_ACCOUNT|
672 SLAB_MEM_SPREAD|
673 SLAB_ACCOUNT),
674 init_once);
675 if (reiserfs_inode_cachep == NULL)
676 return -ENOMEM;
677 return 0;
678}
679
680static void destroy_inodecache(void)
681{
682 /*
683 * Make sure all delayed rcu free inodes are flushed before we
684 * destroy cache.
685 */
686 rcu_barrier();
687 kmem_cache_destroy(reiserfs_inode_cachep);
688}
689
690/* we don't mark inodes dirty, we just log them */
691static void reiserfs_dirty_inode(struct inode *inode, int flags)
692{
693 struct reiserfs_transaction_handle th;
694
695 int err = 0;
696
697 if (sb_rdonly(inode->i_sb)) {
698 reiserfs_warning(inode->i_sb, "clm-6006",
699 "writing inode %lu on readonly FS",
700 inode->i_ino);
701 return;
702 }
703 reiserfs_write_lock(inode->i_sb);
704
705 /*
706 * this is really only used for atime updates, so they don't have
707 * to be included in O_SYNC or fsync
708 */
709 err = journal_begin(&th, inode->i_sb, 1);
710 if (err)
711 goto out;
712
713 reiserfs_update_sd(&th, inode);
714 journal_end(&th);
715
716out:
717 reiserfs_write_unlock(inode->i_sb);
718}
719
720static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
721{
722 struct super_block *s = root->d_sb;
723 struct reiserfs_journal *journal = SB_JOURNAL(s);
724 long opts = REISERFS_SB(s)->s_mount_opt;
725
726 if (opts & (1 << REISERFS_LARGETAIL))
727 seq_puts(seq, ",tails=on");
728 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
729 seq_puts(seq, ",notail");
730 /* tails=small is default so we don't show it */
731
732 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
733 seq_puts(seq, ",barrier=none");
734 /* barrier=flush is default so we don't show it */
735
736 if (opts & (1 << REISERFS_ERROR_CONTINUE))
737 seq_puts(seq, ",errors=continue");
738 else if (opts & (1 << REISERFS_ERROR_PANIC))
739 seq_puts(seq, ",errors=panic");
740 /* errors=ro is default so we don't show it */
741
742 if (opts & (1 << REISERFS_DATA_LOG))
743 seq_puts(seq, ",data=journal");
744 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
745 seq_puts(seq, ",data=writeback");
746 /* data=ordered is default so we don't show it */
747
748 if (opts & (1 << REISERFS_ATTRS))
749 seq_puts(seq, ",attrs");
750
751 if (opts & (1 << REISERFS_XATTRS_USER))
752 seq_puts(seq, ",user_xattr");
753
754 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
755 seq_puts(seq, ",expose_privroot");
756
757 if (opts & (1 << REISERFS_POSIXACL))
758 seq_puts(seq, ",acl");
759
760 if (REISERFS_SB(s)->s_jdev)
761 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
762
763 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
764 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
765
766#ifdef CONFIG_QUOTA
767 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
768 seq_show_option(seq, "usrjquota",
769 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
770 else if (opts & (1 << REISERFS_USRQUOTA))
771 seq_puts(seq, ",usrquota");
772 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
773 seq_show_option(seq, "grpjquota",
774 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
775 else if (opts & (1 << REISERFS_GRPQUOTA))
776 seq_puts(seq, ",grpquota");
777 if (REISERFS_SB(s)->s_jquota_fmt) {
778 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
779 seq_puts(seq, ",jqfmt=vfsold");
780 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
781 seq_puts(seq, ",jqfmt=vfsv0");
782 }
783#endif
784
785 /* Block allocator options */
786 if (opts & (1 << REISERFS_NO_BORDER))
787 seq_puts(seq, ",block-allocator=noborder");
788 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
789 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
790 if (opts & (1 << REISERFS_HASHED_RELOCATION))
791 seq_puts(seq, ",block-allocator=hashed_relocation");
792 if (opts & (1 << REISERFS_TEST4))
793 seq_puts(seq, ",block-allocator=test4");
794 show_alloc_options(seq, s);
795 return 0;
796}
797
798#ifdef CONFIG_QUOTA
799static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
800 size_t, loff_t);
801static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
802 loff_t);
803
804static struct dquot **reiserfs_get_dquots(struct inode *inode)
805{
806 return REISERFS_I(inode)->i_dquot;
807}
808#endif
809
810static const struct super_operations reiserfs_sops = {
811 .alloc_inode = reiserfs_alloc_inode,
812 .free_inode = reiserfs_free_inode,
813 .write_inode = reiserfs_write_inode,
814 .dirty_inode = reiserfs_dirty_inode,
815 .evict_inode = reiserfs_evict_inode,
816 .put_super = reiserfs_put_super,
817 .sync_fs = reiserfs_sync_fs,
818 .freeze_fs = reiserfs_freeze,
819 .unfreeze_fs = reiserfs_unfreeze,
820 .statfs = reiserfs_statfs,
821 .remount_fs = reiserfs_remount,
822 .show_options = reiserfs_show_options,
823#ifdef CONFIG_QUOTA
824 .quota_read = reiserfs_quota_read,
825 .quota_write = reiserfs_quota_write,
826 .get_dquots = reiserfs_get_dquots,
827#endif
828};
829
830#ifdef CONFIG_QUOTA
831#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
832
833static int reiserfs_write_dquot(struct dquot *);
834static int reiserfs_acquire_dquot(struct dquot *);
835static int reiserfs_release_dquot(struct dquot *);
836static int reiserfs_mark_dquot_dirty(struct dquot *);
837static int reiserfs_write_info(struct super_block *, int);
838static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
839
840static const struct dquot_operations reiserfs_quota_operations = {
841 .write_dquot = reiserfs_write_dquot,
842 .acquire_dquot = reiserfs_acquire_dquot,
843 .release_dquot = reiserfs_release_dquot,
844 .mark_dirty = reiserfs_mark_dquot_dirty,
845 .write_info = reiserfs_write_info,
846 .alloc_dquot = dquot_alloc,
847 .destroy_dquot = dquot_destroy,
848 .get_next_id = dquot_get_next_id,
849};
850
851static const struct quotactl_ops reiserfs_qctl_operations = {
852 .quota_on = reiserfs_quota_on,
853 .quota_off = reiserfs_quota_off,
854 .quota_sync = dquot_quota_sync,
855 .get_state = dquot_get_state,
856 .set_info = dquot_set_dqinfo,
857 .get_dqblk = dquot_get_dqblk,
858 .set_dqblk = dquot_set_dqblk,
859};
860#endif
861
862static const struct export_operations reiserfs_export_ops = {
863 .encode_fh = reiserfs_encode_fh,
864 .fh_to_dentry = reiserfs_fh_to_dentry,
865 .fh_to_parent = reiserfs_fh_to_parent,
866 .get_parent = reiserfs_get_parent,
867};
868
869/*
870 * this struct is used in reiserfs_getopt () for containing the value for
871 * those mount options that have values rather than being toggles.
872 */
873typedef struct {
874 char *value;
875 /*
876 * bitmask which is to set on mount_options bitmask
877 * when this value is found, 0 is no bits are to be changed.
878 */
879 int setmask;
880 /*
881 * bitmask which is to clear on mount_options bitmask
882 * when this value is found, 0 is no bits are to be changed.
883 * This is applied BEFORE setmask
884 */
885 int clrmask;
886} arg_desc_t;
887
888/* Set this bit in arg_required to allow empty arguments */
889#define REISERFS_OPT_ALLOWEMPTY 31
890
891/*
892 * this struct is used in reiserfs_getopt() for describing the
893 * set of reiserfs mount options
894 */
895typedef struct {
896 char *option_name;
897
898 /* 0 if argument is not required, not 0 otherwise */
899 int arg_required;
900
901 /* list of values accepted by an option */
902 const arg_desc_t *values;
903
904 /*
905 * bitmask which is to set on mount_options bitmask
906 * when this value is found, 0 is no bits are to be changed.
907 */
908 int setmask;
909
910 /*
911 * bitmask which is to clear on mount_options bitmask
912 * when this value is found, 0 is no bits are to be changed.
913 * This is applied BEFORE setmask
914 */
915 int clrmask;
916} opt_desc_t;
917
918/* possible values for -o data= */
919static const arg_desc_t logging_mode[] = {
920 {"ordered", 1 << REISERFS_DATA_ORDERED,
921 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
922 {"journal", 1 << REISERFS_DATA_LOG,
923 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
924 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
925 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
926 {.value = NULL}
927};
928
929/* possible values for -o barrier= */
930static const arg_desc_t barrier_mode[] = {
931 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
932 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
933 {.value = NULL}
934};
935
936/*
937 * possible values for "-o block-allocator=" and bits which are to be set in
938 * s_mount_opt of reiserfs specific part of in-core super block
939 */
940static const arg_desc_t balloc[] = {
941 {"noborder", 1 << REISERFS_NO_BORDER, 0},
942 {"border", 0, 1 << REISERFS_NO_BORDER},
943 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
944 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
945 {"test4", 1 << REISERFS_TEST4, 0},
946 {"notest4", 0, 1 << REISERFS_TEST4},
947 {NULL, 0, 0}
948};
949
950static const arg_desc_t tails[] = {
951 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
952 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
953 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
954 {NULL, 0, 0}
955};
956
957static const arg_desc_t error_actions[] = {
958 {"panic", 1 << REISERFS_ERROR_PANIC,
959 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
960 {"ro-remount", 1 << REISERFS_ERROR_RO,
961 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
962#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
963 {"continue", 1 << REISERFS_ERROR_CONTINUE,
964 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
965#endif
966 {NULL, 0, 0},
967};
968
969/*
970 * proceed only one option from a list *cur - string containing of mount
971 * options
972 * opts - array of options which are accepted
973 * opt_arg - if option is found and requires an argument and if it is specifed
974 * in the input - pointer to the argument is stored here
975 * bit_flags - if option requires to set a certain bit - it is set here
976 * return -1 if unknown option is found, opt->arg_required otherwise
977 */
978static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
979 char **opt_arg, unsigned long *bit_flags)
980{
981 char *p;
982 /*
983 * foo=bar,
984 * ^ ^ ^
985 * | | +-- option_end
986 * | +-- arg_start
987 * +-- option_start
988 */
989 const opt_desc_t *opt;
990 const arg_desc_t *arg;
991
992 p = *cur;
993
994 /* assume argument cannot contain commas */
995 *cur = strchr(p, ',');
996 if (*cur) {
997 *(*cur) = '\0';
998 (*cur)++;
999 }
1000
1001 if (!strncmp(p, "alloc=", 6)) {
1002 /*
1003 * Ugly special case, probably we should redo options
1004 * parser so that it can understand several arguments for
1005 * some options, also so that it can fill several bitfields
1006 * with option values.
1007 */
1008 if (reiserfs_parse_alloc_options(s, p + 6)) {
1009 return -1;
1010 } else {
1011 return 0;
1012 }
1013 }
1014
1015 /* for every option in the list */
1016 for (opt = opts; opt->option_name; opt++) {
1017 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1018 if (bit_flags) {
1019 if (opt->clrmask ==
1020 (1 << REISERFS_UNSUPPORTED_OPT))
1021 reiserfs_warning(s, "super-6500",
1022 "%s not supported.\n",
1023 p);
1024 else
1025 *bit_flags &= ~opt->clrmask;
1026 if (opt->setmask ==
1027 (1 << REISERFS_UNSUPPORTED_OPT))
1028 reiserfs_warning(s, "super-6501",
1029 "%s not supported.\n",
1030 p);
1031 else
1032 *bit_flags |= opt->setmask;
1033 }
1034 break;
1035 }
1036 }
1037 if (!opt->option_name) {
1038 reiserfs_warning(s, "super-6502",
1039 "unknown mount option \"%s\"", p);
1040 return -1;
1041 }
1042
1043 p += strlen(opt->option_name);
1044 switch (*p) {
1045 case '=':
1046 if (!opt->arg_required) {
1047 reiserfs_warning(s, "super-6503",
1048 "the option \"%s\" does not "
1049 "require an argument\n",
1050 opt->option_name);
1051 return -1;
1052 }
1053 break;
1054
1055 case 0:
1056 if (opt->arg_required) {
1057 reiserfs_warning(s, "super-6504",
1058 "the option \"%s\" requires an "
1059 "argument\n", opt->option_name);
1060 return -1;
1061 }
1062 break;
1063 default:
1064 reiserfs_warning(s, "super-6505",
1065 "head of option \"%s\" is only correct\n",
1066 opt->option_name);
1067 return -1;
1068 }
1069
1070 /*
1071 * move to the argument, or to next option if argument is not
1072 * required
1073 */
1074 p++;
1075
1076 if (opt->arg_required
1077 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1078 && !strlen(p)) {
1079 /* this catches "option=," if not allowed */
1080 reiserfs_warning(s, "super-6506",
1081 "empty argument for \"%s\"\n",
1082 opt->option_name);
1083 return -1;
1084 }
1085
1086 if (!opt->values) {
1087 /* *=NULLopt_arg contains pointer to argument */
1088 *opt_arg = p;
1089 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1090 }
1091
1092 /* values possible for this option are listed in opt->values */
1093 for (arg = opt->values; arg->value; arg++) {
1094 if (!strcmp(p, arg->value)) {
1095 if (bit_flags) {
1096 *bit_flags &= ~arg->clrmask;
1097 *bit_flags |= arg->setmask;
1098 }
1099 return opt->arg_required;
1100 }
1101 }
1102
1103 reiserfs_warning(s, "super-6506",
1104 "bad value \"%s\" for option \"%s\"\n", p,
1105 opt->option_name);
1106 return -1;
1107}
1108
1109/* returns 0 if something is wrong in option string, 1 - otherwise */
1110static int reiserfs_parse_options(struct super_block *s,
1111
1112 /* string given via mount's -o */
1113 char *options,
1114
1115 /*
1116 * after the parsing phase, contains the
1117 * collection of bitflags defining what
1118 * mount options were selected.
1119 */
1120 unsigned long *mount_options,
1121
1122 /* strtol-ed from NNN of resize=NNN */
1123 unsigned long *blocks,
1124 char **jdev_name,
1125 unsigned int *commit_max_age,
1126 char **qf_names,
1127 unsigned int *qfmt)
1128{
1129 int c;
1130 char *arg = NULL;
1131 char *pos;
1132 opt_desc_t opts[] = {
1133 /*
1134 * Compatibility stuff, so that -o notail for old
1135 * setups still work
1136 */
1137 {"tails",.arg_required = 't',.values = tails},
1138 {"notail",.clrmask =
1139 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1140 {"conv",.setmask = 1 << REISERFS_CONVERT},
1141 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1142 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1143 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1144#ifdef CONFIG_REISERFS_FS_XATTR
1145 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1146 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1147#else
1148 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1149 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1150#endif
1151#ifdef CONFIG_REISERFS_FS_POSIX_ACL
1152 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1153 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1154#else
1155 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157#endif
1158 {.option_name = "nolog"},
1159 {"replayonly",.setmask = 1 << REPLAYONLY},
1160 {"block-allocator",.arg_required = 'a',.values = balloc},
1161 {"data",.arg_required = 'd',.values = logging_mode},
1162 {"barrier",.arg_required = 'b',.values = barrier_mode},
1163 {"resize",.arg_required = 'r',.values = NULL},
1164 {"jdev",.arg_required = 'j',.values = NULL},
1165 {"nolargeio",.arg_required = 'w',.values = NULL},
1166 {"commit",.arg_required = 'c',.values = NULL},
1167 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1168 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1169 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1170 {"errors",.arg_required = 'e',.values = error_actions},
1171 {"usrjquota",.arg_required =
1172 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1173 {"grpjquota",.arg_required =
1174 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1175 {"jqfmt",.arg_required = 'f',.values = NULL},
1176 {.option_name = NULL}
1177 };
1178
1179 *blocks = 0;
1180 if (!options || !*options)
1181 /*
1182 * use default configuration: create tails, journaling on, no
1183 * conversion to newest format
1184 */
1185 return 1;
1186
1187 for (pos = options; pos;) {
1188 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1189 if (c == -1)
1190 /* wrong option is given */
1191 return 0;
1192
1193 if (c == 'r') {
1194 char *p;
1195
1196 p = NULL;
1197 /* "resize=NNN" or "resize=auto" */
1198
1199 if (!strcmp(arg, "auto")) {
1200 /* From JFS code, to auto-get the size. */
1201 *blocks =
1202 i_size_read(s->s_bdev->bd_inode) >> s->
1203 s_blocksize_bits;
1204 } else {
1205 *blocks = simple_strtoul(arg, &p, 0);
1206 if (*p != '\0') {
1207 /* NNN does not look like a number */
1208 reiserfs_warning(s, "super-6507",
1209 "bad value %s for "
1210 "-oresize\n", arg);
1211 return 0;
1212 }
1213 }
1214 }
1215
1216 if (c == 'c') {
1217 char *p = NULL;
1218 unsigned long val = simple_strtoul(arg, &p, 0);
1219 /* commit=NNN (time in seconds) */
1220 if (*p != '\0' || val >= (unsigned int)-1) {
1221 reiserfs_warning(s, "super-6508",
1222 "bad value %s for -ocommit\n",
1223 arg);
1224 return 0;
1225 }
1226 *commit_max_age = (unsigned int)val;
1227 }
1228
1229 if (c == 'w') {
1230 reiserfs_warning(s, "super-6509", "nolargeio option "
1231 "is no longer supported");
1232 return 0;
1233 }
1234
1235 if (c == 'j') {
1236 if (arg && *arg && jdev_name) {
1237 /* Hm, already assigned? */
1238 if (*jdev_name) {
1239 reiserfs_warning(s, "super-6510",
1240 "journal device was "
1241 "already specified to "
1242 "be %s", *jdev_name);
1243 return 0;
1244 }
1245 *jdev_name = arg;
1246 }
1247 }
1248#ifdef CONFIG_QUOTA
1249 if (c == 'u' || c == 'g') {
1250 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1251
1252 if (sb_any_quota_loaded(s) &&
1253 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1254 reiserfs_warning(s, "super-6511",
1255 "cannot change journaled "
1256 "quota options when quota "
1257 "turned on.");
1258 return 0;
1259 }
1260 if (*arg) { /* Some filename specified? */
1261 if (REISERFS_SB(s)->s_qf_names[qtype]
1262 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1263 arg)) {
1264 reiserfs_warning(s, "super-6512",
1265 "%s quota file "
1266 "already specified.",
1267 QTYPE2NAME(qtype));
1268 return 0;
1269 }
1270 if (strchr(arg, '/')) {
1271 reiserfs_warning(s, "super-6513",
1272 "quotafile must be "
1273 "on filesystem root.");
1274 return 0;
1275 }
1276 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1277 if (!qf_names[qtype]) {
1278 reiserfs_warning(s, "reiserfs-2502",
1279 "not enough memory "
1280 "for storing "
1281 "quotafile name.");
1282 return 0;
1283 }
1284 if (qtype == USRQUOTA)
1285 *mount_options |= 1 << REISERFS_USRQUOTA;
1286 else
1287 *mount_options |= 1 << REISERFS_GRPQUOTA;
1288 } else {
1289 if (qf_names[qtype] !=
1290 REISERFS_SB(s)->s_qf_names[qtype])
1291 kfree(qf_names[qtype]);
1292 qf_names[qtype] = NULL;
1293 if (qtype == USRQUOTA)
1294 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1295 else
1296 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1297 }
1298 }
1299 if (c == 'f') {
1300 if (!strcmp(arg, "vfsold"))
1301 *qfmt = QFMT_VFS_OLD;
1302 else if (!strcmp(arg, "vfsv0"))
1303 *qfmt = QFMT_VFS_V0;
1304 else {
1305 reiserfs_warning(s, "super-6514",
1306 "unknown quota format "
1307 "specified.");
1308 return 0;
1309 }
1310 if (sb_any_quota_loaded(s) &&
1311 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1312 reiserfs_warning(s, "super-6515",
1313 "cannot change journaled "
1314 "quota options when quota "
1315 "turned on.");
1316 return 0;
1317 }
1318 }
1319#else
1320 if (c == 'u' || c == 'g' || c == 'f') {
1321 reiserfs_warning(s, "reiserfs-2503", "journaled "
1322 "quota options not supported.");
1323 return 0;
1324 }
1325#endif
1326 }
1327
1328#ifdef CONFIG_QUOTA
1329 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1330 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1331 reiserfs_warning(s, "super-6515",
1332 "journaled quota format not specified.");
1333 return 0;
1334 }
1335 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1336 sb_has_quota_loaded(s, USRQUOTA)) ||
1337 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1338 sb_has_quota_loaded(s, GRPQUOTA))) {
1339 reiserfs_warning(s, "super-6516", "quota options must "
1340 "be present when quota is turned on.");
1341 return 0;
1342 }
1343#endif
1344
1345 return 1;
1346}
1347
1348static void switch_data_mode(struct super_block *s, unsigned long mode)
1349{
1350 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1351 (1 << REISERFS_DATA_ORDERED) |
1352 (1 << REISERFS_DATA_WRITEBACK));
1353 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1354}
1355
1356static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1357{
1358 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1359 if (!reiserfs_data_log(s)) {
1360 switch_data_mode(s, REISERFS_DATA_LOG);
1361 reiserfs_info(s, "switching to journaled data mode\n");
1362 }
1363 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1364 if (!reiserfs_data_ordered(s)) {
1365 switch_data_mode(s, REISERFS_DATA_ORDERED);
1366 reiserfs_info(s, "switching to ordered data mode\n");
1367 }
1368 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1369 if (!reiserfs_data_writeback(s)) {
1370 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1371 reiserfs_info(s, "switching to writeback data mode\n");
1372 }
1373 }
1374}
1375
1376static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1377{
1378 int flush = (1 << REISERFS_BARRIER_FLUSH);
1379 int none = (1 << REISERFS_BARRIER_NONE);
1380 int all_barrier = flush | none;
1381
1382 if (bits & all_barrier) {
1383 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1384 if (bits & flush) {
1385 REISERFS_SB(s)->s_mount_opt |= flush;
1386 printk("reiserfs: enabling write barrier flush mode\n");
1387 } else if (bits & none) {
1388 REISERFS_SB(s)->s_mount_opt |= none;
1389 printk("reiserfs: write barriers turned off\n");
1390 }
1391 }
1392}
1393
1394static void handle_attrs(struct super_block *s)
1395{
1396 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1397
1398 if (reiserfs_attrs(s)) {
1399 if (old_format_only(s)) {
1400 reiserfs_warning(s, "super-6517", "cannot support "
1401 "attributes on 3.5.x disk format");
1402 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1403 return;
1404 }
1405 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1406 reiserfs_warning(s, "super-6518", "cannot support "
1407 "attributes until flag is set in "
1408 "super-block");
1409 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1410 }
1411 }
1412}
1413
1414#ifdef CONFIG_QUOTA
1415static void handle_quota_files(struct super_block *s, char **qf_names,
1416 unsigned int *qfmt)
1417{
1418 int i;
1419
1420 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1421 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1422 kfree(REISERFS_SB(s)->s_qf_names[i]);
1423 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1424 }
1425 if (*qfmt)
1426 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1427}
1428#endif
1429
1430static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1431{
1432 struct reiserfs_super_block *rs;
1433 struct reiserfs_transaction_handle th;
1434 unsigned long blocks;
1435 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1436 unsigned long safe_mask = 0;
1437 unsigned int commit_max_age = (unsigned int)-1;
1438 struct reiserfs_journal *journal = SB_JOURNAL(s);
1439 char *new_opts;
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 new_opts = kstrdup(arg, GFP_KERNEL);
1448 if (arg && !new_opts)
1449 return -ENOMEM;
1450
1451 sync_filesystem(s);
1452 reiserfs_write_lock(s);
1453
1454#ifdef CONFIG_QUOTA
1455 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1456#endif
1457
1458 rs = SB_DISK_SUPER_BLOCK(s);
1459
1460 if (!reiserfs_parse_options
1461 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1462 qf_names, &qfmt)) {
1463#ifdef CONFIG_QUOTA
1464 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1465 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1466 kfree(qf_names[i]);
1467#endif
1468 err = -EINVAL;
1469 goto out_err_unlock;
1470 }
1471#ifdef CONFIG_QUOTA
1472 handle_quota_files(s, qf_names, &qfmt);
1473#endif
1474
1475 handle_attrs(s);
1476
1477 /* Add options that are safe here */
1478 safe_mask |= 1 << REISERFS_SMALLTAIL;
1479 safe_mask |= 1 << REISERFS_LARGETAIL;
1480 safe_mask |= 1 << REISERFS_NO_BORDER;
1481 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1482 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1483 safe_mask |= 1 << REISERFS_TEST4;
1484 safe_mask |= 1 << REISERFS_ATTRS;
1485 safe_mask |= 1 << REISERFS_XATTRS_USER;
1486 safe_mask |= 1 << REISERFS_POSIXACL;
1487 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1488 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1489 safe_mask |= 1 << REISERFS_ERROR_RO;
1490 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1491 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1492 safe_mask |= 1 << REISERFS_USRQUOTA;
1493 safe_mask |= 1 << REISERFS_GRPQUOTA;
1494
1495 /*
1496 * Update the bitmask, taking care to keep
1497 * the bits we're not allowed to change here
1498 */
1499 REISERFS_SB(s)->s_mount_opt =
1500 (REISERFS_SB(s)->
1501 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1502
1503 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1504 journal->j_max_commit_age = commit_max_age;
1505 journal->j_max_trans_age = commit_max_age;
1506 } else if (commit_max_age == 0) {
1507 /* 0 means restore defaults. */
1508 journal->j_max_commit_age = journal->j_default_max_commit_age;
1509 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1510 }
1511
1512 if (blocks) {
1513 err = reiserfs_resize(s, blocks);
1514 if (err != 0)
1515 goto out_err_unlock;
1516 }
1517
1518 if (*mount_flags & SB_RDONLY) {
1519 reiserfs_write_unlock(s);
1520 reiserfs_xattr_init(s, *mount_flags);
1521 /* remount read-only */
1522 if (sb_rdonly(s))
1523 /* it is read-only already */
1524 goto out_ok_unlocked;
1525
1526 err = dquot_suspend(s, -1);
1527 if (err < 0)
1528 goto out_err;
1529
1530 /* try to remount file system with read-only permissions */
1531 if (sb_umount_state(rs) == REISERFS_VALID_FS
1532 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1533 goto out_ok_unlocked;
1534 }
1535
1536 reiserfs_write_lock(s);
1537
1538 err = journal_begin(&th, s, 10);
1539 if (err)
1540 goto out_err_unlock;
1541
1542 /* Mounting a rw partition read-only. */
1543 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1544 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1545 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1546 } else {
1547 /* remount read-write */
1548 if (!sb_rdonly(s)) {
1549 reiserfs_write_unlock(s);
1550 reiserfs_xattr_init(s, *mount_flags);
1551 goto out_ok_unlocked; /* We are read-write already */
1552 }
1553
1554 if (reiserfs_is_journal_aborted(journal)) {
1555 err = journal->j_errno;
1556 goto out_err_unlock;
1557 }
1558
1559 handle_data_mode(s, mount_options);
1560 handle_barrier_mode(s, mount_options);
1561 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1562
1563 /* now it is safe to call journal_begin */
1564 s->s_flags &= ~SB_RDONLY;
1565 err = journal_begin(&th, s, 10);
1566 if (err)
1567 goto out_err_unlock;
1568
1569 /* Mount a partition which is read-only, read-write */
1570 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1571 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1572 s->s_flags &= ~SB_RDONLY;
1573 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1574 if (!old_format_only(s))
1575 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1576 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1577 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1578 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1579 }
1580 /* this will force a full flush of all journal lists */
1581 SB_JOURNAL(s)->j_must_wait = 1;
1582 err = journal_end(&th);
1583 if (err)
1584 goto out_err_unlock;
1585
1586 reiserfs_write_unlock(s);
1587 if (!(*mount_flags & SB_RDONLY)) {
1588 dquot_resume(s, -1);
1589 reiserfs_write_lock(s);
1590 finish_unfinished(s);
1591 reiserfs_write_unlock(s);
1592 reiserfs_xattr_init(s, *mount_flags);
1593 }
1594
1595out_ok_unlocked:
1596 return 0;
1597
1598out_err_unlock:
1599 reiserfs_write_unlock(s);
1600out_err:
1601 kfree(new_opts);
1602 return err;
1603}
1604
1605static int read_super_block(struct super_block *s, int offset)
1606{
1607 struct buffer_head *bh;
1608 struct reiserfs_super_block *rs;
1609 int fs_blocksize;
1610
1611 bh = sb_bread(s, offset / s->s_blocksize);
1612 if (!bh) {
1613 reiserfs_warning(s, "sh-2006",
1614 "bread failed (dev %s, block %lu, size %lu)",
1615 s->s_id, offset / s->s_blocksize,
1616 s->s_blocksize);
1617 return 1;
1618 }
1619
1620 rs = (struct reiserfs_super_block *)bh->b_data;
1621 if (!is_any_reiserfs_magic_string(rs)) {
1622 brelse(bh);
1623 return 1;
1624 }
1625 /*
1626 * ok, reiserfs signature (old or new) found in at the given offset
1627 */
1628 fs_blocksize = sb_blocksize(rs);
1629 brelse(bh);
1630 sb_set_blocksize(s, fs_blocksize);
1631
1632 bh = sb_bread(s, offset / s->s_blocksize);
1633 if (!bh) {
1634 reiserfs_warning(s, "sh-2007",
1635 "bread failed (dev %s, block %lu, size %lu)",
1636 s->s_id, offset / s->s_blocksize,
1637 s->s_blocksize);
1638 return 1;
1639 }
1640
1641 rs = (struct reiserfs_super_block *)bh->b_data;
1642 if (sb_blocksize(rs) != s->s_blocksize) {
1643 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1644 "filesystem on (dev %s, block %llu, size %lu)",
1645 s->s_id,
1646 (unsigned long long)bh->b_blocknr,
1647 s->s_blocksize);
1648 brelse(bh);
1649 return 1;
1650 }
1651
1652 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1653 brelse(bh);
1654 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1655 "--rebuild-tree run detected. Please run\n"
1656 "reiserfsck --rebuild-tree and wait for a "
1657 "completion. If that fails\n"
1658 "get newer reiserfsprogs package");
1659 return 1;
1660 }
1661
1662 SB_BUFFER_WITH_SB(s) = bh;
1663 SB_DISK_SUPER_BLOCK(s) = rs;
1664
1665 /*
1666 * magic is of non-standard journal filesystem, look at s_version to
1667 * find which format is in use
1668 */
1669 if (is_reiserfs_jr(rs)) {
1670 if (sb_version(rs) == REISERFS_VERSION_2)
1671 reiserfs_info(s, "found reiserfs format \"3.6\""
1672 " with non-standard journal\n");
1673 else if (sb_version(rs) == REISERFS_VERSION_1)
1674 reiserfs_info(s, "found reiserfs format \"3.5\""
1675 " with non-standard journal\n");
1676 else {
1677 reiserfs_warning(s, "sh-2012", "found unknown "
1678 "format \"%u\" of reiserfs with "
1679 "non-standard magic", sb_version(rs));
1680 return 1;
1681 }
1682 } else
1683 /*
1684 * s_version of standard format may contain incorrect
1685 * information, so we just look at the magic string
1686 */
1687 reiserfs_info(s,
1688 "found reiserfs format \"%s\" with standard journal\n",
1689 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1690
1691 s->s_op = &reiserfs_sops;
1692 s->s_export_op = &reiserfs_export_ops;
1693#ifdef CONFIG_QUOTA
1694 s->s_qcop = &reiserfs_qctl_operations;
1695 s->dq_op = &reiserfs_quota_operations;
1696 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1697#endif
1698
1699 /*
1700 * new format is limited by the 32 bit wide i_blocks field, want to
1701 * be one full block below that.
1702 */
1703 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1704 return 0;
1705}
1706
1707/* after journal replay, reread all bitmap and super blocks */
1708static int reread_meta_blocks(struct super_block *s)
1709{
1710 ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1711 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1712 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1713 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1714 return 1;
1715 }
1716
1717 return 0;
1718}
1719
1720/* hash detection stuff */
1721
1722/*
1723 * if root directory is empty - we set default - Yura's - hash and
1724 * warn about it
1725 * FIXME: we look for only one name in a directory. If tea and yura
1726 * both have the same value - we ask user to send report to the
1727 * mailing list
1728 */
1729static __u32 find_hash_out(struct super_block *s)
1730{
1731 int retval;
1732 struct inode *inode;
1733 struct cpu_key key;
1734 INITIALIZE_PATH(path);
1735 struct reiserfs_dir_entry de;
1736 struct reiserfs_de_head *deh;
1737 __u32 hash = DEFAULT_HASH;
1738 __u32 deh_hashval, teahash, r5hash, yurahash;
1739
1740 inode = d_inode(s->s_root);
1741
1742 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1743 retval = search_by_entry_key(s, &key, &path, &de);
1744 if (retval == IO_ERROR) {
1745 pathrelse(&path);
1746 return UNSET_HASH;
1747 }
1748 if (retval == NAME_NOT_FOUND)
1749 de.de_entry_num--;
1750
1751 set_de_name_and_namelen(&de);
1752 deh = de.de_deh + de.de_entry_num;
1753
1754 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1755 /* allow override in this case */
1756 if (reiserfs_rupasov_hash(s))
1757 hash = YURA_HASH;
1758 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1759 goto out;
1760 }
1761
1762 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1763 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1764 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1765 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1766
1767 if ((teahash == r5hash && deh_hashval == r5hash) ||
1768 (teahash == yurahash && deh_hashval == yurahash) ||
1769 (r5hash == yurahash && deh_hashval == yurahash)) {
1770 reiserfs_warning(s, "reiserfs-2506",
1771 "Unable to automatically detect hash "
1772 "function. Please mount with -o "
1773 "hash={tea,rupasov,r5}");
1774 hash = UNSET_HASH;
1775 goto out;
1776 }
1777
1778 if (deh_hashval == yurahash)
1779 hash = YURA_HASH;
1780 else if (deh_hashval == teahash)
1781 hash = TEA_HASH;
1782 else if (deh_hashval == r5hash)
1783 hash = R5_HASH;
1784 else {
1785 reiserfs_warning(s, "reiserfs-2506",
1786 "Unrecognised hash function");
1787 hash = UNSET_HASH;
1788 }
1789out:
1790 pathrelse(&path);
1791 return hash;
1792}
1793
1794/* finds out which hash names are sorted with */
1795static int what_hash(struct super_block *s)
1796{
1797 __u32 code;
1798
1799 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1800
1801 /*
1802 * reiserfs_hash_detect() == true if any of the hash mount options
1803 * were used. We must check them to make sure the user isn't
1804 * using a bad hash value
1805 */
1806 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1807 code = find_hash_out(s);
1808
1809 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1810 /*
1811 * detection has found the hash, and we must check against the
1812 * mount options
1813 */
1814 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1815 reiserfs_warning(s, "reiserfs-2507",
1816 "Error, %s hash detected, "
1817 "unable to force rupasov hash",
1818 reiserfs_hashname(code));
1819 code = UNSET_HASH;
1820 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1821 reiserfs_warning(s, "reiserfs-2508",
1822 "Error, %s hash detected, "
1823 "unable to force tea hash",
1824 reiserfs_hashname(code));
1825 code = UNSET_HASH;
1826 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1827 reiserfs_warning(s, "reiserfs-2509",
1828 "Error, %s hash detected, "
1829 "unable to force r5 hash",
1830 reiserfs_hashname(code));
1831 code = UNSET_HASH;
1832 }
1833 } else {
1834 /*
1835 * find_hash_out was not called or
1836 * could not determine the hash
1837 */
1838 if (reiserfs_rupasov_hash(s)) {
1839 code = YURA_HASH;
1840 } else if (reiserfs_tea_hash(s)) {
1841 code = TEA_HASH;
1842 } else if (reiserfs_r5_hash(s)) {
1843 code = R5_HASH;
1844 }
1845 }
1846
1847 /*
1848 * if we are mounted RW, and we have a new valid hash code, update
1849 * the super
1850 */
1851 if (code != UNSET_HASH &&
1852 !sb_rdonly(s) &&
1853 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1854 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1855 }
1856 return code;
1857}
1858
1859/* return pointer to appropriate function */
1860static hashf_t hash_function(struct super_block *s)
1861{
1862 switch (what_hash(s)) {
1863 case TEA_HASH:
1864 reiserfs_info(s, "Using tea hash to sort names\n");
1865 return keyed_hash;
1866 case YURA_HASH:
1867 reiserfs_info(s, "Using rupasov hash to sort names\n");
1868 return yura_hash;
1869 case R5_HASH:
1870 reiserfs_info(s, "Using r5 hash to sort names\n");
1871 return r5_hash;
1872 }
1873 return NULL;
1874}
1875
1876/* this is used to set up correct value for old partitions */
1877static int function2code(hashf_t func)
1878{
1879 if (func == keyed_hash)
1880 return TEA_HASH;
1881 if (func == yura_hash)
1882 return YURA_HASH;
1883 if (func == r5_hash)
1884 return R5_HASH;
1885
1886 BUG(); /* should never happen */
1887
1888 return 0;
1889}
1890
1891#define SWARN(silent, s, id, ...) \
1892 if (!(silent)) \
1893 reiserfs_warning(s, id, __VA_ARGS__)
1894
1895static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1896{
1897 struct inode *root_inode;
1898 struct reiserfs_transaction_handle th;
1899 int old_format = 0;
1900 unsigned long blocks;
1901 unsigned int commit_max_age = 0;
1902 int jinit_done = 0;
1903 struct reiserfs_iget_args args;
1904 struct reiserfs_super_block *rs;
1905 char *jdev_name;
1906 struct reiserfs_sb_info *sbi;
1907 int errval = -EINVAL;
1908 char *qf_names[REISERFS_MAXQUOTAS] = {};
1909 unsigned int qfmt = 0;
1910
1911 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1912 if (!sbi)
1913 return -ENOMEM;
1914 s->s_fs_info = sbi;
1915 /* Set default values for options: non-aggressive tails, RO on errors */
1916 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1917 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1918 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1919 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1920 sbi->s_alloc_options.preallocmin = 0;
1921 /* Preallocate by 16 blocks (17-1) at once */
1922 sbi->s_alloc_options.preallocsize = 17;
1923 /* setup default block allocator options */
1924 reiserfs_init_alloc_options(s);
1925
1926 spin_lock_init(&sbi->old_work_lock);
1927 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1928 mutex_init(&sbi->lock);
1929 sbi->lock_depth = -1;
1930
1931 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1932 s->s_id);
1933 if (!sbi->commit_wq) {
1934 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1935 errval = -ENOMEM;
1936 goto error_unlocked;
1937 }
1938
1939 jdev_name = NULL;
1940 if (reiserfs_parse_options
1941 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1942 &commit_max_age, qf_names, &qfmt) == 0) {
1943 goto error_unlocked;
1944 }
1945 if (jdev_name && jdev_name[0]) {
1946 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1947 if (!sbi->s_jdev) {
1948 SWARN(silent, s, "", "Cannot allocate memory for "
1949 "journal device name");
1950 goto error;
1951 }
1952 }
1953#ifdef CONFIG_QUOTA
1954 handle_quota_files(s, qf_names, &qfmt);
1955#endif
1956
1957 if (blocks) {
1958 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1959 goto error_unlocked;
1960 }
1961
1962 /*
1963 * try old format (undistributed bitmap, super block in 8-th 1k
1964 * block of a device)
1965 */
1966 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1967 old_format = 1;
1968
1969 /*
1970 * try new format (64-th 1k block), which can contain reiserfs
1971 * super block
1972 */
1973 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1974 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1975 s->s_id);
1976 goto error_unlocked;
1977 }
1978
1979 s->s_time_min = 0;
1980 s->s_time_max = U32_MAX;
1981
1982 rs = SB_DISK_SUPER_BLOCK(s);
1983 /*
1984 * Let's do basic sanity check to verify that underlying device is not
1985 * smaller than the filesystem. If the check fails then abort and
1986 * scream, because bad stuff will happen otherwise.
1987 */
1988 if (s->s_bdev && s->s_bdev->bd_inode
1989 && i_size_read(s->s_bdev->bd_inode) <
1990 sb_block_count(rs) * sb_blocksize(rs)) {
1991 SWARN(silent, s, "", "Filesystem cannot be "
1992 "mounted because it is bigger than the device");
1993 SWARN(silent, s, "", "You may need to run fsck "
1994 "or increase size of your LVM partition");
1995 SWARN(silent, s, "", "Or may be you forgot to "
1996 "reboot after fdisk when it told you to");
1997 goto error_unlocked;
1998 }
1999
2000 sbi->s_mount_state = SB_REISERFS_STATE(s);
2001 sbi->s_mount_state = REISERFS_VALID_FS;
2002
2003 if ((errval = reiserfs_init_bitmap_cache(s))) {
2004 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2005 goto error_unlocked;
2006 }
2007
2008 errval = -EINVAL;
2009#ifdef CONFIG_REISERFS_CHECK
2010 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2011 SWARN(silent, s, "", "- it is slow mode for debugging.");
2012#endif
2013
2014 /* make data=ordered the default */
2015 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2016 !reiserfs_data_writeback(s)) {
2017 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2018 }
2019
2020 if (reiserfs_data_log(s)) {
2021 reiserfs_info(s, "using journaled data mode\n");
2022 } else if (reiserfs_data_ordered(s)) {
2023 reiserfs_info(s, "using ordered data mode\n");
2024 } else {
2025 reiserfs_info(s, "using writeback data mode\n");
2026 }
2027 if (reiserfs_barrier_flush(s)) {
2028 printk("reiserfs: using flush barriers\n");
2029 }
2030
2031 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2032 SWARN(silent, s, "sh-2022",
2033 "unable to initialize journal space");
2034 goto error_unlocked;
2035 } else {
2036 /*
2037 * once this is set, journal_release must be called
2038 * if we error out of the mount
2039 */
2040 jinit_done = 1;
2041 }
2042
2043 if (reread_meta_blocks(s)) {
2044 SWARN(silent, s, "jmacd-9",
2045 "unable to reread meta blocks after journal init");
2046 goto error_unlocked;
2047 }
2048
2049 if (replay_only(s))
2050 goto error_unlocked;
2051
2052 if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2053 SWARN(silent, s, "clm-7000",
2054 "Detected readonly device, marking FS readonly");
2055 s->s_flags |= SB_RDONLY;
2056 }
2057 args.objectid = REISERFS_ROOT_OBJECTID;
2058 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2059 root_inode =
2060 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2061 reiserfs_init_locked_inode, (void *)&args);
2062 if (!root_inode) {
2063 SWARN(silent, s, "jmacd-10", "get root inode failed");
2064 goto error_unlocked;
2065 }
2066
2067 /*
2068 * This path assumed to be called with the BKL in the old times.
2069 * Now we have inherited the big reiserfs lock from it and many
2070 * reiserfs helpers called in the mount path and elsewhere require
2071 * this lock to be held even if it's not always necessary. Let's be
2072 * conservative and hold it early. The window can be reduced after
2073 * careful review of the code.
2074 */
2075 reiserfs_write_lock(s);
2076
2077 if (root_inode->i_state & I_NEW) {
2078 reiserfs_read_locked_inode(root_inode, &args);
2079 unlock_new_inode(root_inode);
2080 }
2081
2082 s->s_root = d_make_root(root_inode);
2083 if (!s->s_root)
2084 goto error;
2085 /* define and initialize hash function */
2086 sbi->s_hash_function = hash_function(s);
2087 if (sbi->s_hash_function == NULL) {
2088 dput(s->s_root);
2089 s->s_root = NULL;
2090 goto error;
2091 }
2092
2093 if (is_reiserfs_3_5(rs)
2094 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2095 set_bit(REISERFS_3_5, &sbi->s_properties);
2096 else if (old_format)
2097 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2098 else
2099 set_bit(REISERFS_3_6, &sbi->s_properties);
2100
2101 if (!sb_rdonly(s)) {
2102
2103 errval = journal_begin(&th, s, 1);
2104 if (errval) {
2105 dput(s->s_root);
2106 s->s_root = NULL;
2107 goto error;
2108 }
2109 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2110
2111 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2112 set_sb_fs_state(rs, 0);
2113
2114 /*
2115 * Clear out s_bmap_nr if it would wrap. We can handle this
2116 * case, but older revisions can't. This will cause the
2117 * file system to fail mount on those older implementations,
2118 * avoiding corruption. -jeffm
2119 */
2120 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2121 sb_bmap_nr(rs) != 0) {
2122 reiserfs_warning(s, "super-2030", "This file system "
2123 "claims to use %u bitmap blocks in "
2124 "its super block, but requires %u. "
2125 "Clearing to zero.", sb_bmap_nr(rs),
2126 reiserfs_bmap_count(s));
2127
2128 set_sb_bmap_nr(rs, 0);
2129 }
2130
2131 if (old_format_only(s)) {
2132 /*
2133 * filesystem of format 3.5 either with standard
2134 * or non-standard journal
2135 */
2136 if (convert_reiserfs(s)) {
2137 /* and -o conv is given */
2138 if (!silent)
2139 reiserfs_info(s,
2140 "converting 3.5 filesystem to the 3.6 format");
2141
2142 if (is_reiserfs_3_5(rs))
2143 /*
2144 * put magic string of 3.6 format.
2145 * 2.2 will not be able to
2146 * mount this filesystem anymore
2147 */
2148 memcpy(rs->s_v1.s_magic,
2149 reiserfs_3_6_magic_string,
2150 sizeof
2151 (reiserfs_3_6_magic_string));
2152
2153 set_sb_version(rs, REISERFS_VERSION_2);
2154 reiserfs_convert_objectid_map_v1(s);
2155 set_bit(REISERFS_3_6, &sbi->s_properties);
2156 clear_bit(REISERFS_3_5, &sbi->s_properties);
2157 } else if (!silent) {
2158 reiserfs_info(s, "using 3.5.x disk format\n");
2159 }
2160 } else
2161 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2162
2163
2164 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2165 errval = journal_end(&th);
2166 if (errval) {
2167 dput(s->s_root);
2168 s->s_root = NULL;
2169 goto error;
2170 }
2171
2172 reiserfs_write_unlock(s);
2173 if ((errval = reiserfs_lookup_privroot(s)) ||
2174 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2175 dput(s->s_root);
2176 s->s_root = NULL;
2177 goto error_unlocked;
2178 }
2179 reiserfs_write_lock(s);
2180
2181 /*
2182 * look for files which were to be removed in previous session
2183 */
2184 finish_unfinished(s);
2185 } else {
2186 if (old_format_only(s) && !silent) {
2187 reiserfs_info(s, "using 3.5.x disk format\n");
2188 }
2189
2190 reiserfs_write_unlock(s);
2191 if ((errval = reiserfs_lookup_privroot(s)) ||
2192 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2193 dput(s->s_root);
2194 s->s_root = NULL;
2195 goto error_unlocked;
2196 }
2197 reiserfs_write_lock(s);
2198 }
2199 /*
2200 * mark hash in super block: it could be unset. overwrite should be ok
2201 */
2202 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2203
2204 handle_attrs(s);
2205
2206 reiserfs_proc_info_init(s);
2207
2208 init_waitqueue_head(&(sbi->s_wait));
2209 spin_lock_init(&sbi->bitmap_lock);
2210
2211 reiserfs_write_unlock(s);
2212
2213 return (0);
2214
2215error:
2216 reiserfs_write_unlock(s);
2217
2218error_unlocked:
2219 /* kill the commit thread, free journal ram */
2220 if (jinit_done) {
2221 reiserfs_write_lock(s);
2222 journal_release_error(NULL, s);
2223 reiserfs_write_unlock(s);
2224 }
2225
2226 if (sbi->commit_wq)
2227 destroy_workqueue(sbi->commit_wq);
2228
2229 reiserfs_cancel_old_flush(s);
2230
2231 reiserfs_free_bitmap_cache(s);
2232 if (SB_BUFFER_WITH_SB(s))
2233 brelse(SB_BUFFER_WITH_SB(s));
2234#ifdef CONFIG_QUOTA
2235 {
2236 int j;
2237 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2238 kfree(qf_names[j]);
2239 }
2240#endif
2241 kfree(sbi);
2242
2243 s->s_fs_info = NULL;
2244 return errval;
2245}
2246
2247static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2248{
2249 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2250
2251 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2252 buf->f_bfree = sb_free_blocks(rs);
2253 buf->f_bavail = buf->f_bfree;
2254 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2255 buf->f_bsize = dentry->d_sb->s_blocksize;
2256 /* changed to accommodate gcc folks. */
2257 buf->f_type = REISERFS_SUPER_MAGIC;
2258 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2259 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2260 sizeof(rs->s_uuid)/2);
2261
2262 return 0;
2263}
2264
2265#ifdef CONFIG_QUOTA
2266static int reiserfs_write_dquot(struct dquot *dquot)
2267{
2268 struct reiserfs_transaction_handle th;
2269 int ret, err;
2270 int depth;
2271
2272 reiserfs_write_lock(dquot->dq_sb);
2273 ret =
2274 journal_begin(&th, dquot->dq_sb,
2275 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2276 if (ret)
2277 goto out;
2278 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2279 ret = dquot_commit(dquot);
2280 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2281 err = journal_end(&th);
2282 if (!ret && err)
2283 ret = err;
2284out:
2285 reiserfs_write_unlock(dquot->dq_sb);
2286 return ret;
2287}
2288
2289static int reiserfs_acquire_dquot(struct dquot *dquot)
2290{
2291 struct reiserfs_transaction_handle th;
2292 int ret, err;
2293 int depth;
2294
2295 reiserfs_write_lock(dquot->dq_sb);
2296 ret =
2297 journal_begin(&th, dquot->dq_sb,
2298 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2299 if (ret)
2300 goto out;
2301 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2302 ret = dquot_acquire(dquot);
2303 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2304 err = journal_end(&th);
2305 if (!ret && err)
2306 ret = err;
2307out:
2308 reiserfs_write_unlock(dquot->dq_sb);
2309 return ret;
2310}
2311
2312static int reiserfs_release_dquot(struct dquot *dquot)
2313{
2314 struct reiserfs_transaction_handle th;
2315 int ret, err;
2316
2317 reiserfs_write_lock(dquot->dq_sb);
2318 ret =
2319 journal_begin(&th, dquot->dq_sb,
2320 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2321 reiserfs_write_unlock(dquot->dq_sb);
2322 if (ret) {
2323 /* Release dquot anyway to avoid endless cycle in dqput() */
2324 dquot_release(dquot);
2325 goto out;
2326 }
2327 ret = dquot_release(dquot);
2328 reiserfs_write_lock(dquot->dq_sb);
2329 err = journal_end(&th);
2330 if (!ret && err)
2331 ret = err;
2332 reiserfs_write_unlock(dquot->dq_sb);
2333out:
2334 return ret;
2335}
2336
2337static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2338{
2339 /* Are we journaling quotas? */
2340 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2341 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2342 dquot_mark_dquot_dirty(dquot);
2343 return reiserfs_write_dquot(dquot);
2344 } else
2345 return dquot_mark_dquot_dirty(dquot);
2346}
2347
2348static int reiserfs_write_info(struct super_block *sb, int type)
2349{
2350 struct reiserfs_transaction_handle th;
2351 int ret, err;
2352 int depth;
2353
2354 /* Data block + inode block */
2355 reiserfs_write_lock(sb);
2356 ret = journal_begin(&th, sb, 2);
2357 if (ret)
2358 goto out;
2359 depth = reiserfs_write_unlock_nested(sb);
2360 ret = dquot_commit_info(sb, type);
2361 reiserfs_write_lock_nested(sb, depth);
2362 err = journal_end(&th);
2363 if (!ret && err)
2364 ret = err;
2365out:
2366 reiserfs_write_unlock(sb);
2367 return ret;
2368}
2369
2370/*
2371 * Turn on quotas during mount time - we need to find the quota file and such...
2372 */
2373static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2374{
2375 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2376 REISERFS_SB(sb)->s_jquota_fmt, type);
2377}
2378
2379/*
2380 * Standard function to be called on quota_on
2381 */
2382static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2383 const struct path *path)
2384{
2385 int err;
2386 struct inode *inode;
2387 struct reiserfs_transaction_handle th;
2388 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2389
2390 reiserfs_write_lock(sb);
2391 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2392 err = -EINVAL;
2393 goto out;
2394 }
2395
2396 /* Quotafile not on the same filesystem? */
2397 if (path->dentry->d_sb != sb) {
2398 err = -EXDEV;
2399 goto out;
2400 }
2401 inode = d_inode(path->dentry);
2402 /*
2403 * We must not pack tails for quota files on reiserfs for quota
2404 * IO to work
2405 */
2406 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2407 err = reiserfs_unpack(inode, NULL);
2408 if (err) {
2409 reiserfs_warning(sb, "super-6520",
2410 "Unpacking tail of quota file failed"
2411 " (%d). Cannot turn on quotas.", err);
2412 err = -EINVAL;
2413 goto out;
2414 }
2415 mark_inode_dirty(inode);
2416 }
2417 /* Journaling quota? */
2418 if (REISERFS_SB(sb)->s_qf_names[type]) {
2419 /* Quotafile not of fs root? */
2420 if (path->dentry->d_parent != sb->s_root)
2421 reiserfs_warning(sb, "super-6521",
2422 "Quota file not on filesystem root. "
2423 "Journalled quota will not work.");
2424 }
2425
2426 /*
2427 * When we journal data on quota file, we have to flush journal to see
2428 * all updates to the file when we bypass pagecache...
2429 */
2430 if (reiserfs_file_data_log(inode)) {
2431 /* Just start temporary transaction and finish it */
2432 err = journal_begin(&th, sb, 1);
2433 if (err)
2434 goto out;
2435 err = journal_end_sync(&th);
2436 if (err)
2437 goto out;
2438 }
2439 reiserfs_write_unlock(sb);
2440 err = dquot_quota_on(sb, type, format_id, path);
2441 if (!err) {
2442 inode_lock(inode);
2443 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2444 REISERFS_NOATIME_FL;
2445 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2446 S_IMMUTABLE | S_NOATIME);
2447 inode_unlock(inode);
2448 mark_inode_dirty(inode);
2449 }
2450 return err;
2451out:
2452 reiserfs_write_unlock(sb);
2453 return err;
2454}
2455
2456static int reiserfs_quota_off(struct super_block *sb, int type)
2457{
2458 int err;
2459 struct inode *inode = sb_dqopt(sb)->files[type];
2460
2461 if (!inode || !igrab(inode))
2462 goto out;
2463
2464 err = dquot_quota_off(sb, type);
2465 if (err)
2466 goto out_put;
2467
2468 inode_lock(inode);
2469 REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2470 REISERFS_NOATIME_FL);
2471 inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2472 inode_unlock(inode);
2473 mark_inode_dirty(inode);
2474out_put:
2475 iput(inode);
2476 return err;
2477out:
2478 return dquot_quota_off(sb, type);
2479}
2480
2481/*
2482 * Read data from quotafile - avoid pagecache and such because we cannot afford
2483 * acquiring the locks... As quota files are never truncated and quota code
2484 * itself serializes the operations (and no one else should touch the files)
2485 * we don't have to be afraid of races
2486 */
2487static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2488 size_t len, loff_t off)
2489{
2490 struct inode *inode = sb_dqopt(sb)->files[type];
2491 unsigned long blk = off >> sb->s_blocksize_bits;
2492 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2493 size_t toread;
2494 struct buffer_head tmp_bh, *bh;
2495 loff_t i_size = i_size_read(inode);
2496
2497 if (off > i_size)
2498 return 0;
2499 if (off + len > i_size)
2500 len = i_size - off;
2501 toread = len;
2502 while (toread > 0) {
2503 tocopy =
2504 sb->s_blocksize - offset <
2505 toread ? sb->s_blocksize - offset : toread;
2506 tmp_bh.b_state = 0;
2507 /*
2508 * Quota files are without tails so we can safely
2509 * use this function
2510 */
2511 reiserfs_write_lock(sb);
2512 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2513 reiserfs_write_unlock(sb);
2514 if (err)
2515 return err;
2516 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2517 memset(data, 0, tocopy);
2518 else {
2519 bh = sb_bread(sb, tmp_bh.b_blocknr);
2520 if (!bh)
2521 return -EIO;
2522 memcpy(data, bh->b_data + offset, tocopy);
2523 brelse(bh);
2524 }
2525 offset = 0;
2526 toread -= tocopy;
2527 data += tocopy;
2528 blk++;
2529 }
2530 return len;
2531}
2532
2533/*
2534 * Write to quotafile (we know the transaction is already started and has
2535 * enough credits)
2536 */
2537static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2538 const char *data, size_t len, loff_t off)
2539{
2540 struct inode *inode = sb_dqopt(sb)->files[type];
2541 unsigned long blk = off >> sb->s_blocksize_bits;
2542 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2543 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2544 size_t towrite = len;
2545 struct buffer_head tmp_bh, *bh;
2546
2547 if (!current->journal_info) {
2548 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2549 (unsigned long long)off, (unsigned long long)len);
2550 return -EIO;
2551 }
2552 while (towrite > 0) {
2553 tocopy = sb->s_blocksize - offset < towrite ?
2554 sb->s_blocksize - offset : towrite;
2555 tmp_bh.b_state = 0;
2556 reiserfs_write_lock(sb);
2557 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2558 reiserfs_write_unlock(sb);
2559 if (err)
2560 goto out;
2561 if (offset || tocopy != sb->s_blocksize)
2562 bh = sb_bread(sb, tmp_bh.b_blocknr);
2563 else
2564 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2565 if (!bh) {
2566 err = -EIO;
2567 goto out;
2568 }
2569 lock_buffer(bh);
2570 memcpy(bh->b_data + offset, data, tocopy);
2571 flush_dcache_page(bh->b_page);
2572 set_buffer_uptodate(bh);
2573 unlock_buffer(bh);
2574 reiserfs_write_lock(sb);
2575 reiserfs_prepare_for_journal(sb, bh, 1);
2576 journal_mark_dirty(current->journal_info, bh);
2577 if (!journal_quota)
2578 reiserfs_add_ordered_list(inode, bh);
2579 reiserfs_write_unlock(sb);
2580 brelse(bh);
2581 offset = 0;
2582 towrite -= tocopy;
2583 data += tocopy;
2584 blk++;
2585 }
2586out:
2587 if (len == towrite)
2588 return err;
2589 if (inode->i_size < off + len - towrite)
2590 i_size_write(inode, off + len - towrite);
2591 inode->i_mtime = inode->i_ctime = current_time(inode);
2592 mark_inode_dirty(inode);
2593 return len - towrite;
2594}
2595
2596#endif
2597
2598static struct dentry *get_super_block(struct file_system_type *fs_type,
2599 int flags, const char *dev_name,
2600 void *data)
2601{
2602 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2603}
2604
2605static int __init init_reiserfs_fs(void)
2606{
2607 int ret;
2608
2609 ret = init_inodecache();
2610 if (ret)
2611 return ret;
2612
2613 reiserfs_proc_info_global_init();
2614
2615 ret = register_filesystem(&reiserfs_fs_type);
2616 if (ret)
2617 goto out;
2618
2619 return 0;
2620out:
2621 reiserfs_proc_info_global_done();
2622 destroy_inodecache();
2623
2624 return ret;
2625}
2626
2627static void __exit exit_reiserfs_fs(void)
2628{
2629 reiserfs_proc_info_global_done();
2630 unregister_filesystem(&reiserfs_fs_type);
2631 destroy_inodecache();
2632}
2633
2634struct file_system_type reiserfs_fs_type = {
2635 .owner = THIS_MODULE,
2636 .name = "reiserfs",
2637 .mount = get_super_block,
2638 .kill_sb = reiserfs_kill_sb,
2639 .fs_flags = FS_REQUIRES_DEV,
2640};
2641MODULE_ALIAS_FS("reiserfs");
2642
2643MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2644MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2645MODULE_LICENSE("GPL");
2646
2647module_init(init_reiserfs_fs);
2648module_exit(exit_reiserfs_fs);
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
34struct file_system_type reiserfs_fs_type;
35
36static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39
40int 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
46int 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
52int 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
58static 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
64static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66
67static 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
84static 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
115void 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
136void 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
147static 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
170static 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
182extern 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 */
193static 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
213static 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 */
225static 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 */
429void 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 */
510int 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
550static 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
574static int reiserfs_quota_off(struct super_block *sb, int type);
575
576static 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
584static inline void reiserfs_quota_off_umount(struct super_block *s)
585{
586}
587#endif
588
589static 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(s->s_fs_info);
633 s->s_fs_info = NULL;
634}
635
636static struct kmem_cache *reiserfs_inode_cachep;
637
638static struct inode *reiserfs_alloc_inode(struct super_block *sb)
639{
640 struct reiserfs_inode_info *ei;
641 ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
642 if (!ei)
643 return NULL;
644 atomic_set(&ei->openers, 0);
645 mutex_init(&ei->tailpack);
646#ifdef CONFIG_QUOTA
647 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
648#endif
649
650 return &ei->vfs_inode;
651}
652
653static void reiserfs_i_callback(struct rcu_head *head)
654{
655 struct inode *inode = container_of(head, struct inode, i_rcu);
656 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657}
658
659static void reiserfs_destroy_inode(struct inode *inode)
660{
661 call_rcu(&inode->i_rcu, reiserfs_i_callback);
662}
663
664static void init_once(void *foo)
665{
666 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
667
668 INIT_LIST_HEAD(&ei->i_prealloc_list);
669 inode_init_once(&ei->vfs_inode);
670}
671
672static int __init init_inodecache(void)
673{
674 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
675 sizeof(struct
676 reiserfs_inode_info),
677 0, (SLAB_RECLAIM_ACCOUNT|
678 SLAB_MEM_SPREAD|
679 SLAB_ACCOUNT),
680 init_once);
681 if (reiserfs_inode_cachep == NULL)
682 return -ENOMEM;
683 return 0;
684}
685
686static void destroy_inodecache(void)
687{
688 /*
689 * Make sure all delayed rcu free inodes are flushed before we
690 * destroy cache.
691 */
692 rcu_barrier();
693 kmem_cache_destroy(reiserfs_inode_cachep);
694}
695
696/* we don't mark inodes dirty, we just log them */
697static void reiserfs_dirty_inode(struct inode *inode, int flags)
698{
699 struct reiserfs_transaction_handle th;
700
701 int err = 0;
702
703 if (sb_rdonly(inode->i_sb)) {
704 reiserfs_warning(inode->i_sb, "clm-6006",
705 "writing inode %lu on readonly FS",
706 inode->i_ino);
707 return;
708 }
709 reiserfs_write_lock(inode->i_sb);
710
711 /*
712 * this is really only used for atime updates, so they don't have
713 * to be included in O_SYNC or fsync
714 */
715 err = journal_begin(&th, inode->i_sb, 1);
716 if (err)
717 goto out;
718
719 reiserfs_update_sd(&th, inode);
720 journal_end(&th);
721
722out:
723 reiserfs_write_unlock(inode->i_sb);
724}
725
726static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
727{
728 struct super_block *s = root->d_sb;
729 struct reiserfs_journal *journal = SB_JOURNAL(s);
730 long opts = REISERFS_SB(s)->s_mount_opt;
731
732 if (opts & (1 << REISERFS_LARGETAIL))
733 seq_puts(seq, ",tails=on");
734 else if (!(opts & (1 << REISERFS_SMALLTAIL)))
735 seq_puts(seq, ",notail");
736 /* tails=small is default so we don't show it */
737
738 if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
739 seq_puts(seq, ",barrier=none");
740 /* barrier=flush is default so we don't show it */
741
742 if (opts & (1 << REISERFS_ERROR_CONTINUE))
743 seq_puts(seq, ",errors=continue");
744 else if (opts & (1 << REISERFS_ERROR_PANIC))
745 seq_puts(seq, ",errors=panic");
746 /* errors=ro is default so we don't show it */
747
748 if (opts & (1 << REISERFS_DATA_LOG))
749 seq_puts(seq, ",data=journal");
750 else if (opts & (1 << REISERFS_DATA_WRITEBACK))
751 seq_puts(seq, ",data=writeback");
752 /* data=ordered is default so we don't show it */
753
754 if (opts & (1 << REISERFS_ATTRS))
755 seq_puts(seq, ",attrs");
756
757 if (opts & (1 << REISERFS_XATTRS_USER))
758 seq_puts(seq, ",user_xattr");
759
760 if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
761 seq_puts(seq, ",expose_privroot");
762
763 if (opts & (1 << REISERFS_POSIXACL))
764 seq_puts(seq, ",acl");
765
766 if (REISERFS_SB(s)->s_jdev)
767 seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
768
769 if (journal->j_max_commit_age != journal->j_default_max_commit_age)
770 seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
771
772#ifdef CONFIG_QUOTA
773 if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
774 seq_show_option(seq, "usrjquota",
775 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
776 else if (opts & (1 << REISERFS_USRQUOTA))
777 seq_puts(seq, ",usrquota");
778 if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
779 seq_show_option(seq, "grpjquota",
780 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
781 else if (opts & (1 << REISERFS_GRPQUOTA))
782 seq_puts(seq, ",grpquota");
783 if (REISERFS_SB(s)->s_jquota_fmt) {
784 if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
785 seq_puts(seq, ",jqfmt=vfsold");
786 else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
787 seq_puts(seq, ",jqfmt=vfsv0");
788 }
789#endif
790
791 /* Block allocator options */
792 if (opts & (1 << REISERFS_NO_BORDER))
793 seq_puts(seq, ",block-allocator=noborder");
794 if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
795 seq_puts(seq, ",block-allocator=no_unhashed_relocation");
796 if (opts & (1 << REISERFS_HASHED_RELOCATION))
797 seq_puts(seq, ",block-allocator=hashed_relocation");
798 if (opts & (1 << REISERFS_TEST4))
799 seq_puts(seq, ",block-allocator=test4");
800 show_alloc_options(seq, s);
801 return 0;
802}
803
804#ifdef CONFIG_QUOTA
805static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
806 size_t, loff_t);
807static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
808 loff_t);
809
810static struct dquot **reiserfs_get_dquots(struct inode *inode)
811{
812 return REISERFS_I(inode)->i_dquot;
813}
814#endif
815
816static const struct super_operations reiserfs_sops = {
817 .alloc_inode = reiserfs_alloc_inode,
818 .destroy_inode = reiserfs_destroy_inode,
819 .write_inode = reiserfs_write_inode,
820 .dirty_inode = reiserfs_dirty_inode,
821 .evict_inode = reiserfs_evict_inode,
822 .put_super = reiserfs_put_super,
823 .sync_fs = reiserfs_sync_fs,
824 .freeze_fs = reiserfs_freeze,
825 .unfreeze_fs = reiserfs_unfreeze,
826 .statfs = reiserfs_statfs,
827 .remount_fs = reiserfs_remount,
828 .show_options = reiserfs_show_options,
829#ifdef CONFIG_QUOTA
830 .quota_read = reiserfs_quota_read,
831 .quota_write = reiserfs_quota_write,
832 .get_dquots = reiserfs_get_dquots,
833#endif
834};
835
836#ifdef CONFIG_QUOTA
837#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
838
839static int reiserfs_write_dquot(struct dquot *);
840static int reiserfs_acquire_dquot(struct dquot *);
841static int reiserfs_release_dquot(struct dquot *);
842static int reiserfs_mark_dquot_dirty(struct dquot *);
843static int reiserfs_write_info(struct super_block *, int);
844static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
845
846static const struct dquot_operations reiserfs_quota_operations = {
847 .write_dquot = reiserfs_write_dquot,
848 .acquire_dquot = reiserfs_acquire_dquot,
849 .release_dquot = reiserfs_release_dquot,
850 .mark_dirty = reiserfs_mark_dquot_dirty,
851 .write_info = reiserfs_write_info,
852 .alloc_dquot = dquot_alloc,
853 .destroy_dquot = dquot_destroy,
854 .get_next_id = dquot_get_next_id,
855};
856
857static const struct quotactl_ops reiserfs_qctl_operations = {
858 .quota_on = reiserfs_quota_on,
859 .quota_off = reiserfs_quota_off,
860 .quota_sync = dquot_quota_sync,
861 .get_state = dquot_get_state,
862 .set_info = dquot_set_dqinfo,
863 .get_dqblk = dquot_get_dqblk,
864 .set_dqblk = dquot_set_dqblk,
865};
866#endif
867
868static const struct export_operations reiserfs_export_ops = {
869 .encode_fh = reiserfs_encode_fh,
870 .fh_to_dentry = reiserfs_fh_to_dentry,
871 .fh_to_parent = reiserfs_fh_to_parent,
872 .get_parent = reiserfs_get_parent,
873};
874
875/*
876 * this struct is used in reiserfs_getopt () for containing the value for
877 * those mount options that have values rather than being toggles.
878 */
879typedef struct {
880 char *value;
881 /*
882 * bitmask which is to set on mount_options bitmask
883 * when this value is found, 0 is no bits are to be changed.
884 */
885 int setmask;
886 /*
887 * bitmask which is to clear on mount_options bitmask
888 * when this value is found, 0 is no bits are to be changed.
889 * This is applied BEFORE setmask
890 */
891 int clrmask;
892} arg_desc_t;
893
894/* Set this bit in arg_required to allow empty arguments */
895#define REISERFS_OPT_ALLOWEMPTY 31
896
897/*
898 * this struct is used in reiserfs_getopt() for describing the
899 * set of reiserfs mount options
900 */
901typedef struct {
902 char *option_name;
903
904 /* 0 if argument is not required, not 0 otherwise */
905 int arg_required;
906
907 /* list of values accepted by an option */
908 const arg_desc_t *values;
909
910 /*
911 * bitmask which is to set on mount_options bitmask
912 * when this value is found, 0 is no bits are to be changed.
913 */
914 int setmask;
915
916 /*
917 * bitmask which is to clear on mount_options bitmask
918 * when this value is found, 0 is no bits are to be changed.
919 * This is applied BEFORE setmask
920 */
921 int clrmask;
922} opt_desc_t;
923
924/* possible values for -o data= */
925static const arg_desc_t logging_mode[] = {
926 {"ordered", 1 << REISERFS_DATA_ORDERED,
927 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
928 {"journal", 1 << REISERFS_DATA_LOG,
929 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
930 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
931 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
932 {.value = NULL}
933};
934
935/* possible values for -o barrier= */
936static const arg_desc_t barrier_mode[] = {
937 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
938 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
939 {.value = NULL}
940};
941
942/*
943 * possible values for "-o block-allocator=" and bits which are to be set in
944 * s_mount_opt of reiserfs specific part of in-core super block
945 */
946static const arg_desc_t balloc[] = {
947 {"noborder", 1 << REISERFS_NO_BORDER, 0},
948 {"border", 0, 1 << REISERFS_NO_BORDER},
949 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
950 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
951 {"test4", 1 << REISERFS_TEST4, 0},
952 {"notest4", 0, 1 << REISERFS_TEST4},
953 {NULL, 0, 0}
954};
955
956static const arg_desc_t tails[] = {
957 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
958 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
959 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
960 {NULL, 0, 0}
961};
962
963static const arg_desc_t error_actions[] = {
964 {"panic", 1 << REISERFS_ERROR_PANIC,
965 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
966 {"ro-remount", 1 << REISERFS_ERROR_RO,
967 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
968#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
969 {"continue", 1 << REISERFS_ERROR_CONTINUE,
970 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
971#endif
972 {NULL, 0, 0},
973};
974
975/*
976 * proceed only one option from a list *cur - string containing of mount
977 * options
978 * opts - array of options which are accepted
979 * opt_arg - if option is found and requires an argument and if it is specifed
980 * in the input - pointer to the argument is stored here
981 * bit_flags - if option requires to set a certain bit - it is set here
982 * return -1 if unknown option is found, opt->arg_required otherwise
983 */
984static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
985 char **opt_arg, unsigned long *bit_flags)
986{
987 char *p;
988 /*
989 * foo=bar,
990 * ^ ^ ^
991 * | | +-- option_end
992 * | +-- arg_start
993 * +-- option_start
994 */
995 const opt_desc_t *opt;
996 const arg_desc_t *arg;
997
998 p = *cur;
999
1000 /* assume argument cannot contain commas */
1001 *cur = strchr(p, ',');
1002 if (*cur) {
1003 *(*cur) = '\0';
1004 (*cur)++;
1005 }
1006
1007 if (!strncmp(p, "alloc=", 6)) {
1008 /*
1009 * Ugly special case, probably we should redo options
1010 * parser so that it can understand several arguments for
1011 * some options, also so that it can fill several bitfields
1012 * with option values.
1013 */
1014 if (reiserfs_parse_alloc_options(s, p + 6)) {
1015 return -1;
1016 } else {
1017 return 0;
1018 }
1019 }
1020
1021 /* for every option in the list */
1022 for (opt = opts; opt->option_name; opt++) {
1023 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1024 if (bit_flags) {
1025 if (opt->clrmask ==
1026 (1 << REISERFS_UNSUPPORTED_OPT))
1027 reiserfs_warning(s, "super-6500",
1028 "%s not supported.\n",
1029 p);
1030 else
1031 *bit_flags &= ~opt->clrmask;
1032 if (opt->setmask ==
1033 (1 << REISERFS_UNSUPPORTED_OPT))
1034 reiserfs_warning(s, "super-6501",
1035 "%s not supported.\n",
1036 p);
1037 else
1038 *bit_flags |= opt->setmask;
1039 }
1040 break;
1041 }
1042 }
1043 if (!opt->option_name) {
1044 reiserfs_warning(s, "super-6502",
1045 "unknown mount option \"%s\"", p);
1046 return -1;
1047 }
1048
1049 p += strlen(opt->option_name);
1050 switch (*p) {
1051 case '=':
1052 if (!opt->arg_required) {
1053 reiserfs_warning(s, "super-6503",
1054 "the option \"%s\" does not "
1055 "require an argument\n",
1056 opt->option_name);
1057 return -1;
1058 }
1059 break;
1060
1061 case 0:
1062 if (opt->arg_required) {
1063 reiserfs_warning(s, "super-6504",
1064 "the option \"%s\" requires an "
1065 "argument\n", opt->option_name);
1066 return -1;
1067 }
1068 break;
1069 default:
1070 reiserfs_warning(s, "super-6505",
1071 "head of option \"%s\" is only correct\n",
1072 opt->option_name);
1073 return -1;
1074 }
1075
1076 /*
1077 * move to the argument, or to next option if argument is not
1078 * required
1079 */
1080 p++;
1081
1082 if (opt->arg_required
1083 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1084 && !strlen(p)) {
1085 /* this catches "option=," if not allowed */
1086 reiserfs_warning(s, "super-6506",
1087 "empty argument for \"%s\"\n",
1088 opt->option_name);
1089 return -1;
1090 }
1091
1092 if (!opt->values) {
1093 /* *=NULLopt_arg contains pointer to argument */
1094 *opt_arg = p;
1095 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1096 }
1097
1098 /* values possible for this option are listed in opt->values */
1099 for (arg = opt->values; arg->value; arg++) {
1100 if (!strcmp(p, arg->value)) {
1101 if (bit_flags) {
1102 *bit_flags &= ~arg->clrmask;
1103 *bit_flags |= arg->setmask;
1104 }
1105 return opt->arg_required;
1106 }
1107 }
1108
1109 reiserfs_warning(s, "super-6506",
1110 "bad value \"%s\" for option \"%s\"\n", p,
1111 opt->option_name);
1112 return -1;
1113}
1114
1115/* returns 0 if something is wrong in option string, 1 - otherwise */
1116static int reiserfs_parse_options(struct super_block *s,
1117
1118 /* string given via mount's -o */
1119 char *options,
1120
1121 /*
1122 * after the parsing phase, contains the
1123 * collection of bitflags defining what
1124 * mount options were selected.
1125 */
1126 unsigned long *mount_options,
1127
1128 /* strtol-ed from NNN of resize=NNN */
1129 unsigned long *blocks,
1130 char **jdev_name,
1131 unsigned int *commit_max_age,
1132 char **qf_names,
1133 unsigned int *qfmt)
1134{
1135 int c;
1136 char *arg = NULL;
1137 char *pos;
1138 opt_desc_t opts[] = {
1139 /*
1140 * Compatibility stuff, so that -o notail for old
1141 * setups still work
1142 */
1143 {"tails",.arg_required = 't',.values = tails},
1144 {"notail",.clrmask =
1145 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1146 {"conv",.setmask = 1 << REISERFS_CONVERT},
1147 {"attrs",.setmask = 1 << REISERFS_ATTRS},
1148 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1149 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1150#ifdef CONFIG_REISERFS_FS_XATTR
1151 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1152 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1153#else
1154 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1155 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1156#endif
1157#ifdef CONFIG_REISERFS_FS_POSIX_ACL
1158 {"acl",.setmask = 1 << REISERFS_POSIXACL},
1159 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1160#else
1161 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1162 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1163#endif
1164 {.option_name = "nolog"},
1165 {"replayonly",.setmask = 1 << REPLAYONLY},
1166 {"block-allocator",.arg_required = 'a',.values = balloc},
1167 {"data",.arg_required = 'd',.values = logging_mode},
1168 {"barrier",.arg_required = 'b',.values = barrier_mode},
1169 {"resize",.arg_required = 'r',.values = NULL},
1170 {"jdev",.arg_required = 'j',.values = NULL},
1171 {"nolargeio",.arg_required = 'w',.values = NULL},
1172 {"commit",.arg_required = 'c',.values = NULL},
1173 {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1174 {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1175 {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1176 {"errors",.arg_required = 'e',.values = error_actions},
1177 {"usrjquota",.arg_required =
1178 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1179 {"grpjquota",.arg_required =
1180 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1181 {"jqfmt",.arg_required = 'f',.values = NULL},
1182 {.option_name = NULL}
1183 };
1184
1185 *blocks = 0;
1186 if (!options || !*options)
1187 /*
1188 * use default configuration: create tails, journaling on, no
1189 * conversion to newest format
1190 */
1191 return 1;
1192
1193 for (pos = options; pos;) {
1194 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1195 if (c == -1)
1196 /* wrong option is given */
1197 return 0;
1198
1199 if (c == 'r') {
1200 char *p;
1201
1202 p = NULL;
1203 /* "resize=NNN" or "resize=auto" */
1204
1205 if (!strcmp(arg, "auto")) {
1206 /* From JFS code, to auto-get the size. */
1207 *blocks =
1208 i_size_read(s->s_bdev->bd_inode) >> s->
1209 s_blocksize_bits;
1210 } else {
1211 *blocks = simple_strtoul(arg, &p, 0);
1212 if (*p != '\0') {
1213 /* NNN does not look like a number */
1214 reiserfs_warning(s, "super-6507",
1215 "bad value %s for "
1216 "-oresize\n", arg);
1217 return 0;
1218 }
1219 }
1220 }
1221
1222 if (c == 'c') {
1223 char *p = NULL;
1224 unsigned long val = simple_strtoul(arg, &p, 0);
1225 /* commit=NNN (time in seconds) */
1226 if (*p != '\0' || val >= (unsigned int)-1) {
1227 reiserfs_warning(s, "super-6508",
1228 "bad value %s for -ocommit\n",
1229 arg);
1230 return 0;
1231 }
1232 *commit_max_age = (unsigned int)val;
1233 }
1234
1235 if (c == 'w') {
1236 reiserfs_warning(s, "super-6509", "nolargeio option "
1237 "is no longer supported");
1238 return 0;
1239 }
1240
1241 if (c == 'j') {
1242 if (arg && *arg && jdev_name) {
1243 /* Hm, already assigned? */
1244 if (*jdev_name) {
1245 reiserfs_warning(s, "super-6510",
1246 "journal device was "
1247 "already specified to "
1248 "be %s", *jdev_name);
1249 return 0;
1250 }
1251 *jdev_name = arg;
1252 }
1253 }
1254#ifdef CONFIG_QUOTA
1255 if (c == 'u' || c == 'g') {
1256 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1257
1258 if (sb_any_quota_loaded(s) &&
1259 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1260 reiserfs_warning(s, "super-6511",
1261 "cannot change journaled "
1262 "quota options when quota "
1263 "turned on.");
1264 return 0;
1265 }
1266 if (*arg) { /* Some filename specified? */
1267 if (REISERFS_SB(s)->s_qf_names[qtype]
1268 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1269 arg)) {
1270 reiserfs_warning(s, "super-6512",
1271 "%s quota file "
1272 "already specified.",
1273 QTYPE2NAME(qtype));
1274 return 0;
1275 }
1276 if (strchr(arg, '/')) {
1277 reiserfs_warning(s, "super-6513",
1278 "quotafile must be "
1279 "on filesystem root.");
1280 return 0;
1281 }
1282 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1283 if (!qf_names[qtype]) {
1284 reiserfs_warning(s, "reiserfs-2502",
1285 "not enough memory "
1286 "for storing "
1287 "quotafile name.");
1288 return 0;
1289 }
1290 if (qtype == USRQUOTA)
1291 *mount_options |= 1 << REISERFS_USRQUOTA;
1292 else
1293 *mount_options |= 1 << REISERFS_GRPQUOTA;
1294 } else {
1295 if (qf_names[qtype] !=
1296 REISERFS_SB(s)->s_qf_names[qtype])
1297 kfree(qf_names[qtype]);
1298 qf_names[qtype] = NULL;
1299 if (qtype == USRQUOTA)
1300 *mount_options &= ~(1 << REISERFS_USRQUOTA);
1301 else
1302 *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1303 }
1304 }
1305 if (c == 'f') {
1306 if (!strcmp(arg, "vfsold"))
1307 *qfmt = QFMT_VFS_OLD;
1308 else if (!strcmp(arg, "vfsv0"))
1309 *qfmt = QFMT_VFS_V0;
1310 else {
1311 reiserfs_warning(s, "super-6514",
1312 "unknown quota format "
1313 "specified.");
1314 return 0;
1315 }
1316 if (sb_any_quota_loaded(s) &&
1317 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1318 reiserfs_warning(s, "super-6515",
1319 "cannot change journaled "
1320 "quota options when quota "
1321 "turned on.");
1322 return 0;
1323 }
1324 }
1325#else
1326 if (c == 'u' || c == 'g' || c == 'f') {
1327 reiserfs_warning(s, "reiserfs-2503", "journaled "
1328 "quota options not supported.");
1329 return 0;
1330 }
1331#endif
1332 }
1333
1334#ifdef CONFIG_QUOTA
1335 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1336 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1337 reiserfs_warning(s, "super-6515",
1338 "journaled quota format not specified.");
1339 return 0;
1340 }
1341 if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1342 sb_has_quota_loaded(s, USRQUOTA)) ||
1343 (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1344 sb_has_quota_loaded(s, GRPQUOTA))) {
1345 reiserfs_warning(s, "super-6516", "quota options must "
1346 "be present when quota is turned on.");
1347 return 0;
1348 }
1349#endif
1350
1351 return 1;
1352}
1353
1354static void switch_data_mode(struct super_block *s, unsigned long mode)
1355{
1356 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1357 (1 << REISERFS_DATA_ORDERED) |
1358 (1 << REISERFS_DATA_WRITEBACK));
1359 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1360}
1361
1362static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1363{
1364 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1365 if (!reiserfs_data_log(s)) {
1366 switch_data_mode(s, REISERFS_DATA_LOG);
1367 reiserfs_info(s, "switching to journaled data mode\n");
1368 }
1369 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1370 if (!reiserfs_data_ordered(s)) {
1371 switch_data_mode(s, REISERFS_DATA_ORDERED);
1372 reiserfs_info(s, "switching to ordered data mode\n");
1373 }
1374 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1375 if (!reiserfs_data_writeback(s)) {
1376 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1377 reiserfs_info(s, "switching to writeback data mode\n");
1378 }
1379 }
1380}
1381
1382static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1383{
1384 int flush = (1 << REISERFS_BARRIER_FLUSH);
1385 int none = (1 << REISERFS_BARRIER_NONE);
1386 int all_barrier = flush | none;
1387
1388 if (bits & all_barrier) {
1389 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1390 if (bits & flush) {
1391 REISERFS_SB(s)->s_mount_opt |= flush;
1392 printk("reiserfs: enabling write barrier flush mode\n");
1393 } else if (bits & none) {
1394 REISERFS_SB(s)->s_mount_opt |= none;
1395 printk("reiserfs: write barriers turned off\n");
1396 }
1397 }
1398}
1399
1400static void handle_attrs(struct super_block *s)
1401{
1402 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1403
1404 if (reiserfs_attrs(s)) {
1405 if (old_format_only(s)) {
1406 reiserfs_warning(s, "super-6517", "cannot support "
1407 "attributes on 3.5.x disk format");
1408 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1409 return;
1410 }
1411 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1412 reiserfs_warning(s, "super-6518", "cannot support "
1413 "attributes until flag is set in "
1414 "super-block");
1415 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1416 }
1417 }
1418}
1419
1420#ifdef CONFIG_QUOTA
1421static void handle_quota_files(struct super_block *s, char **qf_names,
1422 unsigned int *qfmt)
1423{
1424 int i;
1425
1426 for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1427 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1428 kfree(REISERFS_SB(s)->s_qf_names[i]);
1429 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1430 }
1431 if (*qfmt)
1432 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1433}
1434#endif
1435
1436static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1437{
1438 struct reiserfs_super_block *rs;
1439 struct reiserfs_transaction_handle th;
1440 unsigned long blocks;
1441 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1442 unsigned long safe_mask = 0;
1443 unsigned int commit_max_age = (unsigned int)-1;
1444 struct reiserfs_journal *journal = SB_JOURNAL(s);
1445 char *new_opts;
1446 int err;
1447 char *qf_names[REISERFS_MAXQUOTAS];
1448 unsigned int qfmt = 0;
1449#ifdef CONFIG_QUOTA
1450 int i;
1451#endif
1452
1453 new_opts = kstrdup(arg, GFP_KERNEL);
1454 if (arg && !new_opts)
1455 return -ENOMEM;
1456
1457 sync_filesystem(s);
1458 reiserfs_write_lock(s);
1459
1460#ifdef CONFIG_QUOTA
1461 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1462#endif
1463
1464 rs = SB_DISK_SUPER_BLOCK(s);
1465
1466 if (!reiserfs_parse_options
1467 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1468 qf_names, &qfmt)) {
1469#ifdef CONFIG_QUOTA
1470 for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1471 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1472 kfree(qf_names[i]);
1473#endif
1474 err = -EINVAL;
1475 goto out_err_unlock;
1476 }
1477#ifdef CONFIG_QUOTA
1478 handle_quota_files(s, qf_names, &qfmt);
1479#endif
1480
1481 handle_attrs(s);
1482
1483 /* Add options that are safe here */
1484 safe_mask |= 1 << REISERFS_SMALLTAIL;
1485 safe_mask |= 1 << REISERFS_LARGETAIL;
1486 safe_mask |= 1 << REISERFS_NO_BORDER;
1487 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1488 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1489 safe_mask |= 1 << REISERFS_TEST4;
1490 safe_mask |= 1 << REISERFS_ATTRS;
1491 safe_mask |= 1 << REISERFS_XATTRS_USER;
1492 safe_mask |= 1 << REISERFS_POSIXACL;
1493 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1494 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1495 safe_mask |= 1 << REISERFS_ERROR_RO;
1496 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1497 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1498 safe_mask |= 1 << REISERFS_USRQUOTA;
1499 safe_mask |= 1 << REISERFS_GRPQUOTA;
1500
1501 /*
1502 * Update the bitmask, taking care to keep
1503 * the bits we're not allowed to change here
1504 */
1505 REISERFS_SB(s)->s_mount_opt =
1506 (REISERFS_SB(s)->
1507 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1508
1509 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1510 journal->j_max_commit_age = commit_max_age;
1511 journal->j_max_trans_age = commit_max_age;
1512 } else if (commit_max_age == 0) {
1513 /* 0 means restore defaults. */
1514 journal->j_max_commit_age = journal->j_default_max_commit_age;
1515 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1516 }
1517
1518 if (blocks) {
1519 err = reiserfs_resize(s, blocks);
1520 if (err != 0)
1521 goto out_err_unlock;
1522 }
1523
1524 if (*mount_flags & SB_RDONLY) {
1525 reiserfs_write_unlock(s);
1526 reiserfs_xattr_init(s, *mount_flags);
1527 /* remount read-only */
1528 if (sb_rdonly(s))
1529 /* it is read-only already */
1530 goto out_ok_unlocked;
1531
1532 err = dquot_suspend(s, -1);
1533 if (err < 0)
1534 goto out_err;
1535
1536 /* try to remount file system with read-only permissions */
1537 if (sb_umount_state(rs) == REISERFS_VALID_FS
1538 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1539 goto out_ok_unlocked;
1540 }
1541
1542 reiserfs_write_lock(s);
1543
1544 err = journal_begin(&th, s, 10);
1545 if (err)
1546 goto out_err_unlock;
1547
1548 /* Mounting a rw partition read-only. */
1549 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1550 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1551 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1552 } else {
1553 /* remount read-write */
1554 if (!sb_rdonly(s)) {
1555 reiserfs_write_unlock(s);
1556 reiserfs_xattr_init(s, *mount_flags);
1557 goto out_ok_unlocked; /* We are read-write already */
1558 }
1559
1560 if (reiserfs_is_journal_aborted(journal)) {
1561 err = journal->j_errno;
1562 goto out_err_unlock;
1563 }
1564
1565 handle_data_mode(s, mount_options);
1566 handle_barrier_mode(s, mount_options);
1567 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1568
1569 /* now it is safe to call journal_begin */
1570 s->s_flags &= ~SB_RDONLY;
1571 err = journal_begin(&th, s, 10);
1572 if (err)
1573 goto out_err_unlock;
1574
1575 /* Mount a partition which is read-only, read-write */
1576 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1577 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1578 s->s_flags &= ~SB_RDONLY;
1579 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1580 if (!old_format_only(s))
1581 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1582 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1583 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1584 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1585 }
1586 /* this will force a full flush of all journal lists */
1587 SB_JOURNAL(s)->j_must_wait = 1;
1588 err = journal_end(&th);
1589 if (err)
1590 goto out_err_unlock;
1591
1592 reiserfs_write_unlock(s);
1593 if (!(*mount_flags & SB_RDONLY)) {
1594 dquot_resume(s, -1);
1595 reiserfs_write_lock(s);
1596 finish_unfinished(s);
1597 reiserfs_write_unlock(s);
1598 reiserfs_xattr_init(s, *mount_flags);
1599 }
1600
1601out_ok_unlocked:
1602 return 0;
1603
1604out_err_unlock:
1605 reiserfs_write_unlock(s);
1606out_err:
1607 kfree(new_opts);
1608 return err;
1609}
1610
1611static int read_super_block(struct super_block *s, int offset)
1612{
1613 struct buffer_head *bh;
1614 struct reiserfs_super_block *rs;
1615 int fs_blocksize;
1616
1617 bh = sb_bread(s, offset / s->s_blocksize);
1618 if (!bh) {
1619 reiserfs_warning(s, "sh-2006",
1620 "bread failed (dev %s, block %lu, size %lu)",
1621 s->s_id, offset / s->s_blocksize,
1622 s->s_blocksize);
1623 return 1;
1624 }
1625
1626 rs = (struct reiserfs_super_block *)bh->b_data;
1627 if (!is_any_reiserfs_magic_string(rs)) {
1628 brelse(bh);
1629 return 1;
1630 }
1631 /*
1632 * ok, reiserfs signature (old or new) found in at the given offset
1633 */
1634 fs_blocksize = sb_blocksize(rs);
1635 brelse(bh);
1636 sb_set_blocksize(s, fs_blocksize);
1637
1638 bh = sb_bread(s, offset / s->s_blocksize);
1639 if (!bh) {
1640 reiserfs_warning(s, "sh-2007",
1641 "bread failed (dev %s, block %lu, size %lu)",
1642 s->s_id, offset / s->s_blocksize,
1643 s->s_blocksize);
1644 return 1;
1645 }
1646
1647 rs = (struct reiserfs_super_block *)bh->b_data;
1648 if (sb_blocksize(rs) != s->s_blocksize) {
1649 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1650 "filesystem on (dev %s, block %llu, size %lu)",
1651 s->s_id,
1652 (unsigned long long)bh->b_blocknr,
1653 s->s_blocksize);
1654 brelse(bh);
1655 return 1;
1656 }
1657
1658 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1659 brelse(bh);
1660 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1661 "--rebuild-tree run detected. Please run\n"
1662 "reiserfsck --rebuild-tree and wait for a "
1663 "completion. If that fails\n"
1664 "get newer reiserfsprogs package");
1665 return 1;
1666 }
1667
1668 SB_BUFFER_WITH_SB(s) = bh;
1669 SB_DISK_SUPER_BLOCK(s) = rs;
1670
1671 /*
1672 * magic is of non-standard journal filesystem, look at s_version to
1673 * find which format is in use
1674 */
1675 if (is_reiserfs_jr(rs)) {
1676 if (sb_version(rs) == REISERFS_VERSION_2)
1677 reiserfs_info(s, "found reiserfs format \"3.6\""
1678 " with non-standard journal\n");
1679 else if (sb_version(rs) == REISERFS_VERSION_1)
1680 reiserfs_info(s, "found reiserfs format \"3.5\""
1681 " with non-standard journal\n");
1682 else {
1683 reiserfs_warning(s, "sh-2012", "found unknown "
1684 "format \"%u\" of reiserfs with "
1685 "non-standard magic", sb_version(rs));
1686 return 1;
1687 }
1688 } else
1689 /*
1690 * s_version of standard format may contain incorrect
1691 * information, so we just look at the magic string
1692 */
1693 reiserfs_info(s,
1694 "found reiserfs format \"%s\" with standard journal\n",
1695 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1696
1697 s->s_op = &reiserfs_sops;
1698 s->s_export_op = &reiserfs_export_ops;
1699#ifdef CONFIG_QUOTA
1700 s->s_qcop = &reiserfs_qctl_operations;
1701 s->dq_op = &reiserfs_quota_operations;
1702 s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1703#endif
1704
1705 /*
1706 * new format is limited by the 32 bit wide i_blocks field, want to
1707 * be one full block below that.
1708 */
1709 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1710 return 0;
1711}
1712
1713/* after journal replay, reread all bitmap and super blocks */
1714static int reread_meta_blocks(struct super_block *s)
1715{
1716 ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
1717 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1718 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1719 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1720 return 1;
1721 }
1722
1723 return 0;
1724}
1725
1726/* hash detection stuff */
1727
1728/*
1729 * if root directory is empty - we set default - Yura's - hash and
1730 * warn about it
1731 * FIXME: we look for only one name in a directory. If tea and yura
1732 * both have the same value - we ask user to send report to the
1733 * mailing list
1734 */
1735static __u32 find_hash_out(struct super_block *s)
1736{
1737 int retval;
1738 struct inode *inode;
1739 struct cpu_key key;
1740 INITIALIZE_PATH(path);
1741 struct reiserfs_dir_entry de;
1742 struct reiserfs_de_head *deh;
1743 __u32 hash = DEFAULT_HASH;
1744 __u32 deh_hashval, teahash, r5hash, yurahash;
1745
1746 inode = d_inode(s->s_root);
1747
1748 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1749 retval = search_by_entry_key(s, &key, &path, &de);
1750 if (retval == IO_ERROR) {
1751 pathrelse(&path);
1752 return UNSET_HASH;
1753 }
1754 if (retval == NAME_NOT_FOUND)
1755 de.de_entry_num--;
1756
1757 set_de_name_and_namelen(&de);
1758 deh = de.de_deh + de.de_entry_num;
1759
1760 if (deh_offset(deh) == DOT_DOT_OFFSET) {
1761 /* allow override in this case */
1762 if (reiserfs_rupasov_hash(s))
1763 hash = YURA_HASH;
1764 reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1765 goto out;
1766 }
1767
1768 deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1769 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1770 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1771 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1772
1773 if ((teahash == r5hash && deh_hashval == r5hash) ||
1774 (teahash == yurahash && deh_hashval == yurahash) ||
1775 (r5hash == yurahash && deh_hashval == yurahash)) {
1776 reiserfs_warning(s, "reiserfs-2506",
1777 "Unable to automatically detect hash "
1778 "function. Please mount with -o "
1779 "hash={tea,rupasov,r5}");
1780 hash = UNSET_HASH;
1781 goto out;
1782 }
1783
1784 if (deh_hashval == yurahash)
1785 hash = YURA_HASH;
1786 else if (deh_hashval == teahash)
1787 hash = TEA_HASH;
1788 else if (deh_hashval == r5hash)
1789 hash = R5_HASH;
1790 else {
1791 reiserfs_warning(s, "reiserfs-2506",
1792 "Unrecognised hash function");
1793 hash = UNSET_HASH;
1794 }
1795out:
1796 pathrelse(&path);
1797 return hash;
1798}
1799
1800/* finds out which hash names are sorted with */
1801static int what_hash(struct super_block *s)
1802{
1803 __u32 code;
1804
1805 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1806
1807 /*
1808 * reiserfs_hash_detect() == true if any of the hash mount options
1809 * were used. We must check them to make sure the user isn't
1810 * using a bad hash value
1811 */
1812 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1813 code = find_hash_out(s);
1814
1815 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1816 /*
1817 * detection has found the hash, and we must check against the
1818 * mount options
1819 */
1820 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1821 reiserfs_warning(s, "reiserfs-2507",
1822 "Error, %s hash detected, "
1823 "unable to force rupasov hash",
1824 reiserfs_hashname(code));
1825 code = UNSET_HASH;
1826 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1827 reiserfs_warning(s, "reiserfs-2508",
1828 "Error, %s hash detected, "
1829 "unable to force tea hash",
1830 reiserfs_hashname(code));
1831 code = UNSET_HASH;
1832 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1833 reiserfs_warning(s, "reiserfs-2509",
1834 "Error, %s hash detected, "
1835 "unable to force r5 hash",
1836 reiserfs_hashname(code));
1837 code = UNSET_HASH;
1838 }
1839 } else {
1840 /*
1841 * find_hash_out was not called or
1842 * could not determine the hash
1843 */
1844 if (reiserfs_rupasov_hash(s)) {
1845 code = YURA_HASH;
1846 } else if (reiserfs_tea_hash(s)) {
1847 code = TEA_HASH;
1848 } else if (reiserfs_r5_hash(s)) {
1849 code = R5_HASH;
1850 }
1851 }
1852
1853 /*
1854 * if we are mounted RW, and we have a new valid hash code, update
1855 * the super
1856 */
1857 if (code != UNSET_HASH &&
1858 !sb_rdonly(s) &&
1859 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1860 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1861 }
1862 return code;
1863}
1864
1865/* return pointer to appropriate function */
1866static hashf_t hash_function(struct super_block *s)
1867{
1868 switch (what_hash(s)) {
1869 case TEA_HASH:
1870 reiserfs_info(s, "Using tea hash to sort names\n");
1871 return keyed_hash;
1872 case YURA_HASH:
1873 reiserfs_info(s, "Using rupasov hash to sort names\n");
1874 return yura_hash;
1875 case R5_HASH:
1876 reiserfs_info(s, "Using r5 hash to sort names\n");
1877 return r5_hash;
1878 }
1879 return NULL;
1880}
1881
1882/* this is used to set up correct value for old partitions */
1883static int function2code(hashf_t func)
1884{
1885 if (func == keyed_hash)
1886 return TEA_HASH;
1887 if (func == yura_hash)
1888 return YURA_HASH;
1889 if (func == r5_hash)
1890 return R5_HASH;
1891
1892 BUG(); /* should never happen */
1893
1894 return 0;
1895}
1896
1897#define SWARN(silent, s, id, ...) \
1898 if (!(silent)) \
1899 reiserfs_warning(s, id, __VA_ARGS__)
1900
1901static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1902{
1903 struct inode *root_inode;
1904 struct reiserfs_transaction_handle th;
1905 int old_format = 0;
1906 unsigned long blocks;
1907 unsigned int commit_max_age = 0;
1908 int jinit_done = 0;
1909 struct reiserfs_iget_args args;
1910 struct reiserfs_super_block *rs;
1911 char *jdev_name;
1912 struct reiserfs_sb_info *sbi;
1913 int errval = -EINVAL;
1914 char *qf_names[REISERFS_MAXQUOTAS] = {};
1915 unsigned int qfmt = 0;
1916
1917 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1918 if (!sbi)
1919 return -ENOMEM;
1920 s->s_fs_info = sbi;
1921 /* Set default values for options: non-aggressive tails, RO on errors */
1922 sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1923 sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1924 sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1925 /* no preallocation minimum, be smart in reiserfs_file_write instead */
1926 sbi->s_alloc_options.preallocmin = 0;
1927 /* Preallocate by 16 blocks (17-1) at once */
1928 sbi->s_alloc_options.preallocsize = 17;
1929 /* setup default block allocator options */
1930 reiserfs_init_alloc_options(s);
1931
1932 spin_lock_init(&sbi->old_work_lock);
1933 INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1934 mutex_init(&sbi->lock);
1935 sbi->lock_depth = -1;
1936
1937 sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1938 s->s_id);
1939 if (!sbi->commit_wq) {
1940 SWARN(silent, s, "", "Cannot allocate commit workqueue");
1941 errval = -ENOMEM;
1942 goto error_unlocked;
1943 }
1944
1945 jdev_name = NULL;
1946 if (reiserfs_parse_options
1947 (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1948 &commit_max_age, qf_names, &qfmt) == 0) {
1949 goto error_unlocked;
1950 }
1951 if (jdev_name && jdev_name[0]) {
1952 sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1953 if (!sbi->s_jdev) {
1954 SWARN(silent, s, "", "Cannot allocate memory for "
1955 "journal device name");
1956 goto error;
1957 }
1958 }
1959#ifdef CONFIG_QUOTA
1960 handle_quota_files(s, qf_names, &qfmt);
1961#endif
1962
1963 if (blocks) {
1964 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1965 goto error_unlocked;
1966 }
1967
1968 /*
1969 * try old format (undistributed bitmap, super block in 8-th 1k
1970 * block of a device)
1971 */
1972 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1973 old_format = 1;
1974
1975 /*
1976 * try new format (64-th 1k block), which can contain reiserfs
1977 * super block
1978 */
1979 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1980 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1981 s->s_id);
1982 goto error_unlocked;
1983 }
1984
1985 rs = SB_DISK_SUPER_BLOCK(s);
1986 /*
1987 * Let's do basic sanity check to verify that underlying device is not
1988 * smaller than the filesystem. If the check fails then abort and
1989 * scream, because bad stuff will happen otherwise.
1990 */
1991 if (s->s_bdev && s->s_bdev->bd_inode
1992 && i_size_read(s->s_bdev->bd_inode) <
1993 sb_block_count(rs) * sb_blocksize(rs)) {
1994 SWARN(silent, s, "", "Filesystem cannot be "
1995 "mounted because it is bigger than the device");
1996 SWARN(silent, s, "", "You may need to run fsck "
1997 "or increase size of your LVM partition");
1998 SWARN(silent, s, "", "Or may be you forgot to "
1999 "reboot after fdisk when it told you to");
2000 goto error_unlocked;
2001 }
2002
2003 sbi->s_mount_state = SB_REISERFS_STATE(s);
2004 sbi->s_mount_state = REISERFS_VALID_FS;
2005
2006 if ((errval = reiserfs_init_bitmap_cache(s))) {
2007 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
2008 goto error_unlocked;
2009 }
2010
2011 errval = -EINVAL;
2012#ifdef CONFIG_REISERFS_CHECK
2013 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2014 SWARN(silent, s, "", "- it is slow mode for debugging.");
2015#endif
2016
2017 /* make data=ordered the default */
2018 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2019 !reiserfs_data_writeback(s)) {
2020 sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2021 }
2022
2023 if (reiserfs_data_log(s)) {
2024 reiserfs_info(s, "using journaled data mode\n");
2025 } else if (reiserfs_data_ordered(s)) {
2026 reiserfs_info(s, "using ordered data mode\n");
2027 } else {
2028 reiserfs_info(s, "using writeback data mode\n");
2029 }
2030 if (reiserfs_barrier_flush(s)) {
2031 printk("reiserfs: using flush barriers\n");
2032 }
2033
2034 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2035 SWARN(silent, s, "sh-2022",
2036 "unable to initialize journal space");
2037 goto error_unlocked;
2038 } else {
2039 /*
2040 * once this is set, journal_release must be called
2041 * if we error out of the mount
2042 */
2043 jinit_done = 1;
2044 }
2045
2046 if (reread_meta_blocks(s)) {
2047 SWARN(silent, s, "jmacd-9",
2048 "unable to reread meta blocks after journal init");
2049 goto error_unlocked;
2050 }
2051
2052 if (replay_only(s))
2053 goto error_unlocked;
2054
2055 if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2056 SWARN(silent, s, "clm-7000",
2057 "Detected readonly device, marking FS readonly");
2058 s->s_flags |= SB_RDONLY;
2059 }
2060 args.objectid = REISERFS_ROOT_OBJECTID;
2061 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2062 root_inode =
2063 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2064 reiserfs_init_locked_inode, (void *)&args);
2065 if (!root_inode) {
2066 SWARN(silent, s, "jmacd-10", "get root inode failed");
2067 goto error_unlocked;
2068 }
2069
2070 /*
2071 * This path assumed to be called with the BKL in the old times.
2072 * Now we have inherited the big reiserfs lock from it and many
2073 * reiserfs helpers called in the mount path and elsewhere require
2074 * this lock to be held even if it's not always necessary. Let's be
2075 * conservative and hold it early. The window can be reduced after
2076 * careful review of the code.
2077 */
2078 reiserfs_write_lock(s);
2079
2080 if (root_inode->i_state & I_NEW) {
2081 reiserfs_read_locked_inode(root_inode, &args);
2082 unlock_new_inode(root_inode);
2083 }
2084
2085 s->s_root = d_make_root(root_inode);
2086 if (!s->s_root)
2087 goto error;
2088 /* define and initialize hash function */
2089 sbi->s_hash_function = hash_function(s);
2090 if (sbi->s_hash_function == NULL) {
2091 dput(s->s_root);
2092 s->s_root = NULL;
2093 goto error;
2094 }
2095
2096 if (is_reiserfs_3_5(rs)
2097 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2098 set_bit(REISERFS_3_5, &sbi->s_properties);
2099 else if (old_format)
2100 set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2101 else
2102 set_bit(REISERFS_3_6, &sbi->s_properties);
2103
2104 if (!sb_rdonly(s)) {
2105
2106 errval = journal_begin(&th, s, 1);
2107 if (errval) {
2108 dput(s->s_root);
2109 s->s_root = NULL;
2110 goto error;
2111 }
2112 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2113
2114 set_sb_umount_state(rs, REISERFS_ERROR_FS);
2115 set_sb_fs_state(rs, 0);
2116
2117 /*
2118 * Clear out s_bmap_nr if it would wrap. We can handle this
2119 * case, but older revisions can't. This will cause the
2120 * file system to fail mount on those older implementations,
2121 * avoiding corruption. -jeffm
2122 */
2123 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2124 sb_bmap_nr(rs) != 0) {
2125 reiserfs_warning(s, "super-2030", "This file system "
2126 "claims to use %u bitmap blocks in "
2127 "its super block, but requires %u. "
2128 "Clearing to zero.", sb_bmap_nr(rs),
2129 reiserfs_bmap_count(s));
2130
2131 set_sb_bmap_nr(rs, 0);
2132 }
2133
2134 if (old_format_only(s)) {
2135 /*
2136 * filesystem of format 3.5 either with standard
2137 * or non-standard journal
2138 */
2139 if (convert_reiserfs(s)) {
2140 /* and -o conv is given */
2141 if (!silent)
2142 reiserfs_info(s,
2143 "converting 3.5 filesystem to the 3.6 format");
2144
2145 if (is_reiserfs_3_5(rs))
2146 /*
2147 * put magic string of 3.6 format.
2148 * 2.2 will not be able to
2149 * mount this filesystem anymore
2150 */
2151 memcpy(rs->s_v1.s_magic,
2152 reiserfs_3_6_magic_string,
2153 sizeof
2154 (reiserfs_3_6_magic_string));
2155
2156 set_sb_version(rs, REISERFS_VERSION_2);
2157 reiserfs_convert_objectid_map_v1(s);
2158 set_bit(REISERFS_3_6, &sbi->s_properties);
2159 clear_bit(REISERFS_3_5, &sbi->s_properties);
2160 } else if (!silent) {
2161 reiserfs_info(s, "using 3.5.x disk format\n");
2162 }
2163 } else
2164 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2165
2166
2167 journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2168 errval = journal_end(&th);
2169 if (errval) {
2170 dput(s->s_root);
2171 s->s_root = NULL;
2172 goto error;
2173 }
2174
2175 reiserfs_write_unlock(s);
2176 if ((errval = reiserfs_lookup_privroot(s)) ||
2177 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2178 dput(s->s_root);
2179 s->s_root = NULL;
2180 goto error_unlocked;
2181 }
2182 reiserfs_write_lock(s);
2183
2184 /*
2185 * look for files which were to be removed in previous session
2186 */
2187 finish_unfinished(s);
2188 } else {
2189 if (old_format_only(s) && !silent) {
2190 reiserfs_info(s, "using 3.5.x disk format\n");
2191 }
2192
2193 reiserfs_write_unlock(s);
2194 if ((errval = reiserfs_lookup_privroot(s)) ||
2195 (errval = reiserfs_xattr_init(s, s->s_flags))) {
2196 dput(s->s_root);
2197 s->s_root = NULL;
2198 goto error_unlocked;
2199 }
2200 reiserfs_write_lock(s);
2201 }
2202 /*
2203 * mark hash in super block: it could be unset. overwrite should be ok
2204 */
2205 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2206
2207 handle_attrs(s);
2208
2209 reiserfs_proc_info_init(s);
2210
2211 init_waitqueue_head(&(sbi->s_wait));
2212 spin_lock_init(&sbi->bitmap_lock);
2213
2214 reiserfs_write_unlock(s);
2215
2216 return (0);
2217
2218error:
2219 reiserfs_write_unlock(s);
2220
2221error_unlocked:
2222 /* kill the commit thread, free journal ram */
2223 if (jinit_done) {
2224 reiserfs_write_lock(s);
2225 journal_release_error(NULL, s);
2226 reiserfs_write_unlock(s);
2227 }
2228
2229 if (sbi->commit_wq)
2230 destroy_workqueue(sbi->commit_wq);
2231
2232 reiserfs_cancel_old_flush(s);
2233
2234 reiserfs_free_bitmap_cache(s);
2235 if (SB_BUFFER_WITH_SB(s))
2236 brelse(SB_BUFFER_WITH_SB(s));
2237#ifdef CONFIG_QUOTA
2238 {
2239 int j;
2240 for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2241 kfree(qf_names[j]);
2242 }
2243#endif
2244 kfree(sbi);
2245
2246 s->s_fs_info = NULL;
2247 return errval;
2248}
2249
2250static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2251{
2252 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2253
2254 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2255 buf->f_bfree = sb_free_blocks(rs);
2256 buf->f_bavail = buf->f_bfree;
2257 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2258 buf->f_bsize = dentry->d_sb->s_blocksize;
2259 /* changed to accommodate gcc folks. */
2260 buf->f_type = REISERFS_SUPER_MAGIC;
2261 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2262 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2263 sizeof(rs->s_uuid)/2);
2264
2265 return 0;
2266}
2267
2268#ifdef CONFIG_QUOTA
2269static int reiserfs_write_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_TRANS_BLOCKS(dquot->dq_sb));
2279 if (ret)
2280 goto out;
2281 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2282 ret = dquot_commit(dquot);
2283 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2284 err = journal_end(&th);
2285 if (!ret && err)
2286 ret = err;
2287out:
2288 reiserfs_write_unlock(dquot->dq_sb);
2289 return ret;
2290}
2291
2292static int reiserfs_acquire_dquot(struct dquot *dquot)
2293{
2294 struct reiserfs_transaction_handle th;
2295 int ret, err;
2296 int depth;
2297
2298 reiserfs_write_lock(dquot->dq_sb);
2299 ret =
2300 journal_begin(&th, dquot->dq_sb,
2301 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2302 if (ret)
2303 goto out;
2304 depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2305 ret = dquot_acquire(dquot);
2306 reiserfs_write_lock_nested(dquot->dq_sb, depth);
2307 err = journal_end(&th);
2308 if (!ret && err)
2309 ret = err;
2310out:
2311 reiserfs_write_unlock(dquot->dq_sb);
2312 return ret;
2313}
2314
2315static int reiserfs_release_dquot(struct dquot *dquot)
2316{
2317 struct reiserfs_transaction_handle th;
2318 int ret, err;
2319
2320 reiserfs_write_lock(dquot->dq_sb);
2321 ret =
2322 journal_begin(&th, dquot->dq_sb,
2323 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2324 reiserfs_write_unlock(dquot->dq_sb);
2325 if (ret) {
2326 /* Release dquot anyway to avoid endless cycle in dqput() */
2327 dquot_release(dquot);
2328 goto out;
2329 }
2330 ret = dquot_release(dquot);
2331 reiserfs_write_lock(dquot->dq_sb);
2332 err = journal_end(&th);
2333 if (!ret && err)
2334 ret = err;
2335 reiserfs_write_unlock(dquot->dq_sb);
2336out:
2337 return ret;
2338}
2339
2340static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2341{
2342 /* Are we journaling quotas? */
2343 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2344 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2345 dquot_mark_dquot_dirty(dquot);
2346 return reiserfs_write_dquot(dquot);
2347 } else
2348 return dquot_mark_dquot_dirty(dquot);
2349}
2350
2351static int reiserfs_write_info(struct super_block *sb, int type)
2352{
2353 struct reiserfs_transaction_handle th;
2354 int ret, err;
2355 int depth;
2356
2357 /* Data block + inode block */
2358 reiserfs_write_lock(sb);
2359 ret = journal_begin(&th, sb, 2);
2360 if (ret)
2361 goto out;
2362 depth = reiserfs_write_unlock_nested(sb);
2363 ret = dquot_commit_info(sb, type);
2364 reiserfs_write_lock_nested(sb, depth);
2365 err = journal_end(&th);
2366 if (!ret && err)
2367 ret = err;
2368out:
2369 reiserfs_write_unlock(sb);
2370 return ret;
2371}
2372
2373/*
2374 * Turn on quotas during mount time - we need to find the quota file and such...
2375 */
2376static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2377{
2378 return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2379 REISERFS_SB(sb)->s_jquota_fmt, type);
2380}
2381
2382/*
2383 * Standard function to be called on quota_on
2384 */
2385static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2386 const struct path *path)
2387{
2388 int err;
2389 struct inode *inode;
2390 struct reiserfs_transaction_handle th;
2391 int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2392
2393 reiserfs_write_lock(sb);
2394 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2395 err = -EINVAL;
2396 goto out;
2397 }
2398
2399 /* Quotafile not on the same filesystem? */
2400 if (path->dentry->d_sb != sb) {
2401 err = -EXDEV;
2402 goto out;
2403 }
2404 inode = d_inode(path->dentry);
2405 /*
2406 * We must not pack tails for quota files on reiserfs for quota
2407 * IO to work
2408 */
2409 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2410 err = reiserfs_unpack(inode, NULL);
2411 if (err) {
2412 reiserfs_warning(sb, "super-6520",
2413 "Unpacking tail of quota file failed"
2414 " (%d). Cannot turn on quotas.", err);
2415 err = -EINVAL;
2416 goto out;
2417 }
2418 mark_inode_dirty(inode);
2419 }
2420 /* Journaling quota? */
2421 if (REISERFS_SB(sb)->s_qf_names[type]) {
2422 /* Quotafile not of fs root? */
2423 if (path->dentry->d_parent != sb->s_root)
2424 reiserfs_warning(sb, "super-6521",
2425 "Quota file not on filesystem root. "
2426 "Journalled quota will not work.");
2427 }
2428
2429 /*
2430 * When we journal data on quota file, we have to flush journal to see
2431 * all updates to the file when we bypass pagecache...
2432 */
2433 if (reiserfs_file_data_log(inode)) {
2434 /* Just start temporary transaction and finish it */
2435 err = journal_begin(&th, sb, 1);
2436 if (err)
2437 goto out;
2438 err = journal_end_sync(&th);
2439 if (err)
2440 goto out;
2441 }
2442 reiserfs_write_unlock(sb);
2443 err = dquot_quota_on(sb, type, format_id, path);
2444 if (!err) {
2445 inode_lock(inode);
2446 REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2447 REISERFS_NOATIME_FL;
2448 inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2449 S_IMMUTABLE | S_NOATIME);
2450 inode_unlock(inode);
2451 mark_inode_dirty(inode);
2452 }
2453 return err;
2454out:
2455 reiserfs_write_unlock(sb);
2456 return err;
2457}
2458
2459static int reiserfs_quota_off(struct super_block *sb, int type)
2460{
2461 int err;
2462 struct inode *inode = sb_dqopt(sb)->files[type];
2463
2464 if (!inode || !igrab(inode))
2465 goto out;
2466
2467 err = dquot_quota_off(sb, type);
2468 if (err)
2469 goto out_put;
2470
2471 inode_lock(inode);
2472 REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2473 REISERFS_NOATIME_FL);
2474 inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2475 inode_unlock(inode);
2476 mark_inode_dirty(inode);
2477out_put:
2478 iput(inode);
2479 return err;
2480out:
2481 return dquot_quota_off(sb, type);
2482}
2483
2484/*
2485 * Read data from quotafile - avoid pagecache and such because we cannot afford
2486 * acquiring the locks... As quota files are never truncated and quota code
2487 * itself serializes the operations (and no one else should touch the files)
2488 * we don't have to be afraid of races
2489 */
2490static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2491 size_t len, loff_t off)
2492{
2493 struct inode *inode = sb_dqopt(sb)->files[type];
2494 unsigned long blk = off >> sb->s_blocksize_bits;
2495 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2496 size_t toread;
2497 struct buffer_head tmp_bh, *bh;
2498 loff_t i_size = i_size_read(inode);
2499
2500 if (off > i_size)
2501 return 0;
2502 if (off + len > i_size)
2503 len = i_size - off;
2504 toread = len;
2505 while (toread > 0) {
2506 tocopy =
2507 sb->s_blocksize - offset <
2508 toread ? sb->s_blocksize - offset : toread;
2509 tmp_bh.b_state = 0;
2510 /*
2511 * Quota files are without tails so we can safely
2512 * use this function
2513 */
2514 reiserfs_write_lock(sb);
2515 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2516 reiserfs_write_unlock(sb);
2517 if (err)
2518 return err;
2519 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2520 memset(data, 0, tocopy);
2521 else {
2522 bh = sb_bread(sb, tmp_bh.b_blocknr);
2523 if (!bh)
2524 return -EIO;
2525 memcpy(data, bh->b_data + offset, tocopy);
2526 brelse(bh);
2527 }
2528 offset = 0;
2529 toread -= tocopy;
2530 data += tocopy;
2531 blk++;
2532 }
2533 return len;
2534}
2535
2536/*
2537 * Write to quotafile (we know the transaction is already started and has
2538 * enough credits)
2539 */
2540static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2541 const char *data, size_t len, loff_t off)
2542{
2543 struct inode *inode = sb_dqopt(sb)->files[type];
2544 unsigned long blk = off >> sb->s_blocksize_bits;
2545 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2546 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2547 size_t towrite = len;
2548 struct buffer_head tmp_bh, *bh;
2549
2550 if (!current->journal_info) {
2551 printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
2552 (unsigned long long)off, (unsigned long long)len);
2553 return -EIO;
2554 }
2555 while (towrite > 0) {
2556 tocopy = sb->s_blocksize - offset < towrite ?
2557 sb->s_blocksize - offset : towrite;
2558 tmp_bh.b_state = 0;
2559 reiserfs_write_lock(sb);
2560 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2561 reiserfs_write_unlock(sb);
2562 if (err)
2563 goto out;
2564 if (offset || tocopy != sb->s_blocksize)
2565 bh = sb_bread(sb, tmp_bh.b_blocknr);
2566 else
2567 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2568 if (!bh) {
2569 err = -EIO;
2570 goto out;
2571 }
2572 lock_buffer(bh);
2573 memcpy(bh->b_data + offset, data, tocopy);
2574 flush_dcache_page(bh->b_page);
2575 set_buffer_uptodate(bh);
2576 unlock_buffer(bh);
2577 reiserfs_write_lock(sb);
2578 reiserfs_prepare_for_journal(sb, bh, 1);
2579 journal_mark_dirty(current->journal_info, bh);
2580 if (!journal_quota)
2581 reiserfs_add_ordered_list(inode, bh);
2582 reiserfs_write_unlock(sb);
2583 brelse(bh);
2584 offset = 0;
2585 towrite -= tocopy;
2586 data += tocopy;
2587 blk++;
2588 }
2589out:
2590 if (len == towrite)
2591 return err;
2592 if (inode->i_size < off + len - towrite)
2593 i_size_write(inode, off + len - towrite);
2594 inode->i_mtime = inode->i_ctime = current_time(inode);
2595 mark_inode_dirty(inode);
2596 return len - towrite;
2597}
2598
2599#endif
2600
2601static struct dentry *get_super_block(struct file_system_type *fs_type,
2602 int flags, const char *dev_name,
2603 void *data)
2604{
2605 return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2606}
2607
2608static int __init init_reiserfs_fs(void)
2609{
2610 int ret;
2611
2612 ret = init_inodecache();
2613 if (ret)
2614 return ret;
2615
2616 reiserfs_proc_info_global_init();
2617
2618 ret = register_filesystem(&reiserfs_fs_type);
2619 if (ret)
2620 goto out;
2621
2622 return 0;
2623out:
2624 reiserfs_proc_info_global_done();
2625 destroy_inodecache();
2626
2627 return ret;
2628}
2629
2630static void __exit exit_reiserfs_fs(void)
2631{
2632 reiserfs_proc_info_global_done();
2633 unregister_filesystem(&reiserfs_fs_type);
2634 destroy_inodecache();
2635}
2636
2637struct file_system_type reiserfs_fs_type = {
2638 .owner = THIS_MODULE,
2639 .name = "reiserfs",
2640 .mount = get_super_block,
2641 .kill_sb = reiserfs_kill_sb,
2642 .fs_flags = FS_REQUIRES_DEV,
2643};
2644MODULE_ALIAS_FS("reiserfs");
2645
2646MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2647MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2648MODULE_LICENSE("GPL");
2649
2650module_init(init_reiserfs_fs);
2651module_exit(exit_reiserfs_fs);