xref: /openbmc/linux/fs/reiserfs/super.c (revision 62e7ca52)
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13 
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/seq_file.h>
32 
33 struct file_system_type reiserfs_fs_type;
34 
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38 
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41 	return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42 			strlen(reiserfs_3_5_magic_string));
43 }
44 
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47 	return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48 			strlen(reiserfs_3_6_magic_string));
49 }
50 
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53 	return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54 			strlen(reiserfs_jr_magic_string));
55 }
56 
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59 	return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60 		is_reiserfs_jr(rs));
61 }
62 
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65 
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68 	struct reiserfs_transaction_handle th;
69 
70 	/*
71 	 * Writeback quota in non-journalled quota case - journalled quota has
72 	 * no dirty dquots
73 	 */
74 	dquot_writeback_dquots(s, -1);
75 	reiserfs_write_lock(s);
76 	if (!journal_begin(&th, s, 1))
77 		if (!journal_end_sync(&th))
78 			reiserfs_flush_old_commits(s);
79 	reiserfs_write_unlock(s);
80 	return 0;
81 }
82 
83 static void flush_old_commits(struct work_struct *work)
84 {
85 	struct reiserfs_sb_info *sbi;
86 	struct super_block *s;
87 
88 	sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
89 	s = sbi->s_journal->j_work_sb;
90 
91 	spin_lock(&sbi->old_work_lock);
92 	sbi->work_queued = 0;
93 	spin_unlock(&sbi->old_work_lock);
94 
95 	reiserfs_sync_fs(s, 1);
96 }
97 
98 void reiserfs_schedule_old_flush(struct super_block *s)
99 {
100 	struct reiserfs_sb_info *sbi = REISERFS_SB(s);
101 	unsigned long delay;
102 
103 	if (s->s_flags & MS_RDONLY)
104 		return;
105 
106 	spin_lock(&sbi->old_work_lock);
107 	if (!sbi->work_queued) {
108 		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
109 		queue_delayed_work(system_long_wq, &sbi->old_work, delay);
110 		sbi->work_queued = 1;
111 	}
112 	spin_unlock(&sbi->old_work_lock);
113 }
114 
115 static void cancel_old_flush(struct super_block *s)
116 {
117 	struct reiserfs_sb_info *sbi = REISERFS_SB(s);
118 
119 	cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
120 	spin_lock(&sbi->old_work_lock);
121 	sbi->work_queued = 0;
122 	spin_unlock(&sbi->old_work_lock);
123 }
124 
125 static int reiserfs_freeze(struct super_block *s)
126 {
127 	struct reiserfs_transaction_handle th;
128 
129 	cancel_old_flush(s);
130 
131 	reiserfs_write_lock(s);
132 	if (!(s->s_flags & MS_RDONLY)) {
133 		int err = journal_begin(&th, s, 1);
134 		if (err) {
135 			reiserfs_block_writes(&th);
136 		} else {
137 			reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
138 						     1);
139 			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
140 			reiserfs_block_writes(&th);
141 			journal_end_sync(&th);
142 		}
143 	}
144 	reiserfs_write_unlock(s);
145 	return 0;
146 }
147 
148 static int reiserfs_unfreeze(struct super_block *s)
149 {
150 	reiserfs_allow_writes(s);
151 	return 0;
152 }
153 
154 extern const struct in_core_key MAX_IN_CORE_KEY;
155 
156 /*
157  * this is used to delete "save link" when there are no items of a
158  * file it points to. It can either happen if unlink is completed but
159  * "save unlink" removal, or if file has both unlink and truncate
160  * pending and as unlink completes first (because key of "save link"
161  * protecting unlink is bigger that a key lf "save link" which
162  * protects truncate), so there left no items to make truncate
163  * completion on
164  */
165 static int remove_save_link_only(struct super_block *s,
166 				 struct reiserfs_key *key, int oid_free)
167 {
168 	struct reiserfs_transaction_handle th;
169 	int err;
170 
171 	/* we are going to do one balancing */
172 	err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
173 	if (err)
174 		return err;
175 
176 	reiserfs_delete_solid_item(&th, NULL, key);
177 	if (oid_free)
178 		/* removals are protected by direct items */
179 		reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
180 
181 	return journal_end(&th);
182 }
183 
184 #ifdef CONFIG_QUOTA
185 static int reiserfs_quota_on_mount(struct super_block *, int);
186 #endif
187 
188 /* look for uncompleted unlinks and truncates and complete them */
189 static int finish_unfinished(struct super_block *s)
190 {
191 	INITIALIZE_PATH(path);
192 	struct cpu_key max_cpu_key, obj_key;
193 	struct reiserfs_key save_link_key, last_inode_key;
194 	int retval = 0;
195 	struct item_head *ih;
196 	struct buffer_head *bh;
197 	int item_pos;
198 	char *item;
199 	int done;
200 	struct inode *inode;
201 	int truncate;
202 #ifdef CONFIG_QUOTA
203 	int i;
204 	int ms_active_set;
205 	int quota_enabled[MAXQUOTAS];
206 #endif
207 
208 	/* compose key to look for "save" links */
209 	max_cpu_key.version = KEY_FORMAT_3_5;
210 	max_cpu_key.on_disk_key.k_dir_id = ~0U;
211 	max_cpu_key.on_disk_key.k_objectid = ~0U;
212 	set_cpu_key_k_offset(&max_cpu_key, ~0U);
213 	max_cpu_key.key_length = 3;
214 
215 	memset(&last_inode_key, 0, sizeof(last_inode_key));
216 
217 #ifdef CONFIG_QUOTA
218 	/* Needed for iput() to work correctly and not trash data */
219 	if (s->s_flags & MS_ACTIVE) {
220 		ms_active_set = 0;
221 	} else {
222 		ms_active_set = 1;
223 		s->s_flags |= MS_ACTIVE;
224 	}
225 	/* Turn on quotas so that they are updated correctly */
226 	for (i = 0; i < MAXQUOTAS; i++) {
227 		quota_enabled[i] = 1;
228 		if (REISERFS_SB(s)->s_qf_names[i]) {
229 			int ret;
230 
231 			if (sb_has_quota_active(s, i)) {
232 				quota_enabled[i] = 0;
233 				continue;
234 			}
235 			ret = reiserfs_quota_on_mount(s, i);
236 			if (ret < 0)
237 				reiserfs_warning(s, "reiserfs-2500",
238 						 "cannot turn on journaled "
239 						 "quota: error %d", ret);
240 		}
241 	}
242 #endif
243 
244 	done = 0;
245 	REISERFS_SB(s)->s_is_unlinked_ok = 1;
246 	while (!retval) {
247 		int depth;
248 		retval = search_item(s, &max_cpu_key, &path);
249 		if (retval != ITEM_NOT_FOUND) {
250 			reiserfs_error(s, "vs-2140",
251 				       "search_by_key returned %d", retval);
252 			break;
253 		}
254 
255 		bh = get_last_bh(&path);
256 		item_pos = get_item_pos(&path);
257 		if (item_pos != B_NR_ITEMS(bh)) {
258 			reiserfs_warning(s, "vs-2060",
259 					 "wrong position found");
260 			break;
261 		}
262 		item_pos--;
263 		ih = item_head(bh, item_pos);
264 
265 		if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
266 			/* there are no "save" links anymore */
267 			break;
268 
269 		save_link_key = ih->ih_key;
270 		if (is_indirect_le_ih(ih))
271 			truncate = 1;
272 		else
273 			truncate = 0;
274 
275 		/* reiserfs_iget needs k_dirid and k_objectid only */
276 		item = ih_item_body(bh, ih);
277 		obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
278 		obj_key.on_disk_key.k_objectid =
279 		    le32_to_cpu(ih->ih_key.k_objectid);
280 		obj_key.on_disk_key.k_offset = 0;
281 		obj_key.on_disk_key.k_type = 0;
282 
283 		pathrelse(&path);
284 
285 		inode = reiserfs_iget(s, &obj_key);
286 		if (!inode) {
287 			/*
288 			 * the unlink almost completed, it just did not
289 			 * manage to remove "save" link and release objectid
290 			 */
291 			reiserfs_warning(s, "vs-2180", "iget failed for %K",
292 					 &obj_key);
293 			retval = remove_save_link_only(s, &save_link_key, 1);
294 			continue;
295 		}
296 
297 		if (!truncate && inode->i_nlink) {
298 			/* file is not unlinked */
299 			reiserfs_warning(s, "vs-2185",
300 					 "file %K is not unlinked",
301 					 &obj_key);
302 			retval = remove_save_link_only(s, &save_link_key, 0);
303 			continue;
304 		}
305 		depth = reiserfs_write_unlock_nested(inode->i_sb);
306 		dquot_initialize(inode);
307 		reiserfs_write_lock_nested(inode->i_sb, depth);
308 
309 		if (truncate && S_ISDIR(inode->i_mode)) {
310 			/*
311 			 * We got a truncate request for a dir which
312 			 * is impossible.  The only imaginable way is to
313 			 * execute unfinished truncate request then boot
314 			 * into old kernel, remove the file and create dir
315 			 * with the same key.
316 			 */
317 			reiserfs_warning(s, "green-2101",
318 					 "impossible truncate on a "
319 					 "directory %k. Please report",
320 					 INODE_PKEY(inode));
321 			retval = remove_save_link_only(s, &save_link_key, 0);
322 			truncate = 0;
323 			iput(inode);
324 			continue;
325 		}
326 
327 		if (truncate) {
328 			REISERFS_I(inode)->i_flags |=
329 			    i_link_saved_truncate_mask;
330 			/*
331 			 * not completed truncate found. New size was
332 			 * committed together with "save" link
333 			 */
334 			reiserfs_info(s, "Truncating %k to %Ld ..",
335 				      INODE_PKEY(inode), inode->i_size);
336 
337 			/* don't update modification time */
338 			reiserfs_truncate_file(inode, 0);
339 
340 			retval = remove_save_link(inode, truncate);
341 		} else {
342 			REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
343 			/* not completed unlink (rmdir) found */
344 			reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
345 			if (memcmp(&last_inode_key, INODE_PKEY(inode),
346 					sizeof(last_inode_key))){
347 				last_inode_key = *INODE_PKEY(inode);
348 				/* removal gets completed in iput */
349 				retval = 0;
350 			} else {
351 				reiserfs_warning(s, "super-2189", "Dead loop "
352 						 "in finish_unfinished "
353 						 "detected, just remove "
354 						 "save link\n");
355 				retval = remove_save_link_only(s,
356 							&save_link_key, 0);
357 			}
358 		}
359 
360 		iput(inode);
361 		printk("done\n");
362 		done++;
363 	}
364 	REISERFS_SB(s)->s_is_unlinked_ok = 0;
365 
366 #ifdef CONFIG_QUOTA
367 	/* Turn quotas off */
368 	reiserfs_write_unlock(s);
369 	for (i = 0; i < MAXQUOTAS; i++) {
370 		if (sb_dqopt(s)->files[i] && quota_enabled[i])
371 			dquot_quota_off(s, i);
372 	}
373 	reiserfs_write_lock(s);
374 	if (ms_active_set)
375 		/* Restore the flag back */
376 		s->s_flags &= ~MS_ACTIVE;
377 #endif
378 	pathrelse(&path);
379 	if (done)
380 		reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
381 			      "Completed\n", done);
382 	return retval;
383 }
384 
385 /*
386  * to protect file being unlinked from getting lost we "safe" link files
387  * being unlinked. This link will be deleted in the same transaction with last
388  * item of file. mounting the filesystem we scan all these links and remove
389  * files which almost got lost
390  */
391 void add_save_link(struct reiserfs_transaction_handle *th,
392 		   struct inode *inode, int truncate)
393 {
394 	INITIALIZE_PATH(path);
395 	int retval;
396 	struct cpu_key key;
397 	struct item_head ih;
398 	__le32 link;
399 
400 	BUG_ON(!th->t_trans_id);
401 
402 	/* file can only get one "save link" of each kind */
403 	RFALSE(truncate &&
404 	       (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
405 	       "saved link already exists for truncated inode %lx",
406 	       (long)inode->i_ino);
407 	RFALSE(!truncate &&
408 	       (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
409 	       "saved link already exists for unlinked inode %lx",
410 	       (long)inode->i_ino);
411 
412 	/* setup key of "save" link */
413 	key.version = KEY_FORMAT_3_5;
414 	key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
415 	key.on_disk_key.k_objectid = inode->i_ino;
416 	if (!truncate) {
417 		/* unlink, rmdir, rename */
418 		set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
419 		set_cpu_key_k_type(&key, TYPE_DIRECT);
420 
421 		/* item head of "safe" link */
422 		make_le_item_head(&ih, &key, key.version,
423 				  1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
424 				  4 /*length */ , 0xffff /*free space */ );
425 	} else {
426 		/* truncate */
427 		if (S_ISDIR(inode->i_mode))
428 			reiserfs_warning(inode->i_sb, "green-2102",
429 					 "Adding a truncate savelink for "
430 					 "a directory %k! Please report",
431 					 INODE_PKEY(inode));
432 		set_cpu_key_k_offset(&key, 1);
433 		set_cpu_key_k_type(&key, TYPE_INDIRECT);
434 
435 		/* item head of "safe" link */
436 		make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
437 				  4 /*length */ , 0 /*free space */ );
438 	}
439 	key.key_length = 3;
440 
441 	/* look for its place in the tree */
442 	retval = search_item(inode->i_sb, &key, &path);
443 	if (retval != ITEM_NOT_FOUND) {
444 		if (retval != -ENOSPC)
445 			reiserfs_error(inode->i_sb, "vs-2100",
446 				       "search_by_key (%K) returned %d", &key,
447 				       retval);
448 		pathrelse(&path);
449 		return;
450 	}
451 
452 	/* body of "save" link */
453 	link = INODE_PKEY(inode)->k_dir_id;
454 
455 	/* put "save" link into tree, don't charge quota to anyone */
456 	retval =
457 	    reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
458 	if (retval) {
459 		if (retval != -ENOSPC)
460 			reiserfs_error(inode->i_sb, "vs-2120",
461 				       "insert_item returned %d", retval);
462 	} else {
463 		if (truncate)
464 			REISERFS_I(inode)->i_flags |=
465 			    i_link_saved_truncate_mask;
466 		else
467 			REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
468 	}
469 }
470 
471 /* this opens transaction unlike add_save_link */
472 int remove_save_link(struct inode *inode, int truncate)
473 {
474 	struct reiserfs_transaction_handle th;
475 	struct reiserfs_key key;
476 	int err;
477 
478 	/* we are going to do one balancing only */
479 	err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
480 	if (err)
481 		return err;
482 
483 	/* setup key of "save" link */
484 	key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
485 	key.k_objectid = INODE_PKEY(inode)->k_objectid;
486 	if (!truncate) {
487 		/* unlink, rmdir, rename */
488 		set_le_key_k_offset(KEY_FORMAT_3_5, &key,
489 				    1 + inode->i_sb->s_blocksize);
490 		set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
491 	} else {
492 		/* truncate */
493 		set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
494 		set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
495 	}
496 
497 	if ((truncate &&
498 	     (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
499 	    (!truncate &&
500 	     (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
501 		/* don't take quota bytes from anywhere */
502 		reiserfs_delete_solid_item(&th, NULL, &key);
503 	if (!truncate) {
504 		reiserfs_release_objectid(&th, inode->i_ino);
505 		REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
506 	} else
507 		REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
508 
509 	return journal_end(&th);
510 }
511 
512 static void reiserfs_kill_sb(struct super_block *s)
513 {
514 	if (REISERFS_SB(s)) {
515 		reiserfs_proc_info_done(s);
516 		/*
517 		 * Force any pending inode evictions to occur now. Any
518 		 * inodes to be removed that have extended attributes
519 		 * associated with them need to clean them up before
520 		 * we can release the extended attribute root dentries.
521 		 * shrink_dcache_for_umount will BUG if we don't release
522 		 * those before it's called so ->put_super is too late.
523 		 */
524 		shrink_dcache_sb(s);
525 
526 		dput(REISERFS_SB(s)->xattr_root);
527 		REISERFS_SB(s)->xattr_root = NULL;
528 		dput(REISERFS_SB(s)->priv_root);
529 		REISERFS_SB(s)->priv_root = NULL;
530 	}
531 
532 	kill_block_super(s);
533 }
534 
535 static void reiserfs_put_super(struct super_block *s)
536 {
537 	struct reiserfs_transaction_handle th;
538 	th.t_trans_id = 0;
539 
540 	dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
541 
542 	reiserfs_write_lock(s);
543 
544 	/*
545 	 * change file system state to current state if it was mounted
546 	 * with read-write permissions
547 	 */
548 	if (!(s->s_flags & MS_RDONLY)) {
549 		if (!journal_begin(&th, s, 10)) {
550 			reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
551 						     1);
552 			set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
553 					    REISERFS_SB(s)->s_mount_state);
554 			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
555 		}
556 	}
557 
558 	/*
559 	 * note, journal_release checks for readonly mount, and can
560 	 * decide not to do a journal_end
561 	 */
562 	journal_release(&th, s);
563 
564 	reiserfs_free_bitmap_cache(s);
565 
566 	brelse(SB_BUFFER_WITH_SB(s));
567 
568 	print_statistics(s);
569 
570 	if (REISERFS_SB(s)->reserved_blocks != 0) {
571 		reiserfs_warning(s, "green-2005", "reserved blocks left %d",
572 				 REISERFS_SB(s)->reserved_blocks);
573 	}
574 
575 	reiserfs_write_unlock(s);
576 	mutex_destroy(&REISERFS_SB(s)->lock);
577 	destroy_workqueue(REISERFS_SB(s)->commit_wq);
578 	kfree(s->s_fs_info);
579 	s->s_fs_info = NULL;
580 }
581 
582 static struct kmem_cache *reiserfs_inode_cachep;
583 
584 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
585 {
586 	struct reiserfs_inode_info *ei;
587 	ei = (struct reiserfs_inode_info *)
588 	    kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
589 	if (!ei)
590 		return NULL;
591 	atomic_set(&ei->openers, 0);
592 	mutex_init(&ei->tailpack);
593 	return &ei->vfs_inode;
594 }
595 
596 static void reiserfs_i_callback(struct rcu_head *head)
597 {
598 	struct inode *inode = container_of(head, struct inode, i_rcu);
599 	kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
600 }
601 
602 static void reiserfs_destroy_inode(struct inode *inode)
603 {
604 	call_rcu(&inode->i_rcu, reiserfs_i_callback);
605 }
606 
607 static void init_once(void *foo)
608 {
609 	struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
610 
611 	INIT_LIST_HEAD(&ei->i_prealloc_list);
612 	inode_init_once(&ei->vfs_inode);
613 }
614 
615 static int __init init_inodecache(void)
616 {
617 	reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
618 						  sizeof(struct
619 							 reiserfs_inode_info),
620 						  0, (SLAB_RECLAIM_ACCOUNT|
621 							SLAB_MEM_SPREAD),
622 						  init_once);
623 	if (reiserfs_inode_cachep == NULL)
624 		return -ENOMEM;
625 	return 0;
626 }
627 
628 static void destroy_inodecache(void)
629 {
630 	/*
631 	 * Make sure all delayed rcu free inodes are flushed before we
632 	 * destroy cache.
633 	 */
634 	rcu_barrier();
635 	kmem_cache_destroy(reiserfs_inode_cachep);
636 }
637 
638 /* we don't mark inodes dirty, we just log them */
639 static void reiserfs_dirty_inode(struct inode *inode, int flags)
640 {
641 	struct reiserfs_transaction_handle th;
642 
643 	int err = 0;
644 
645 	if (inode->i_sb->s_flags & MS_RDONLY) {
646 		reiserfs_warning(inode->i_sb, "clm-6006",
647 				 "writing inode %lu on readonly FS",
648 				 inode->i_ino);
649 		return;
650 	}
651 	reiserfs_write_lock(inode->i_sb);
652 
653 	/*
654 	 * this is really only used for atime updates, so they don't have
655 	 * to be included in O_SYNC or fsync
656 	 */
657 	err = journal_begin(&th, inode->i_sb, 1);
658 	if (err)
659 		goto out;
660 
661 	reiserfs_update_sd(&th, inode);
662 	journal_end(&th);
663 
664 out:
665 	reiserfs_write_unlock(inode->i_sb);
666 }
667 
668 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
669 {
670 	struct super_block *s = root->d_sb;
671 	struct reiserfs_journal *journal = SB_JOURNAL(s);
672 	long opts = REISERFS_SB(s)->s_mount_opt;
673 
674 	if (opts & (1 << REISERFS_LARGETAIL))
675 		seq_puts(seq, ",tails=on");
676 	else if (!(opts & (1 << REISERFS_SMALLTAIL)))
677 		seq_puts(seq, ",notail");
678 	/* tails=small is default so we don't show it */
679 
680 	if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
681 		seq_puts(seq, ",barrier=none");
682 	/* barrier=flush is default so we don't show it */
683 
684 	if (opts & (1 << REISERFS_ERROR_CONTINUE))
685 		seq_puts(seq, ",errors=continue");
686 	else if (opts & (1 << REISERFS_ERROR_PANIC))
687 		seq_puts(seq, ",errors=panic");
688 	/* errors=ro is default so we don't show it */
689 
690 	if (opts & (1 << REISERFS_DATA_LOG))
691 		seq_puts(seq, ",data=journal");
692 	else if (opts & (1 << REISERFS_DATA_WRITEBACK))
693 		seq_puts(seq, ",data=writeback");
694 	/* data=ordered is default so we don't show it */
695 
696 	if (opts & (1 << REISERFS_ATTRS))
697 		seq_puts(seq, ",attrs");
698 
699 	if (opts & (1 << REISERFS_XATTRS_USER))
700 		seq_puts(seq, ",user_xattr");
701 
702 	if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
703 		seq_puts(seq, ",expose_privroot");
704 
705 	if (opts & (1 << REISERFS_POSIXACL))
706 		seq_puts(seq, ",acl");
707 
708 	if (REISERFS_SB(s)->s_jdev)
709 		seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
710 
711 	if (journal->j_max_commit_age != journal->j_default_max_commit_age)
712 		seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
713 
714 #ifdef CONFIG_QUOTA
715 	if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
716 		seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
717 	else if (opts & (1 << REISERFS_USRQUOTA))
718 		seq_puts(seq, ",usrquota");
719 	if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
720 		seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
721 	else if (opts & (1 << REISERFS_GRPQUOTA))
722 		seq_puts(seq, ",grpquota");
723 	if (REISERFS_SB(s)->s_jquota_fmt) {
724 		if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
725 			seq_puts(seq, ",jqfmt=vfsold");
726 		else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
727 			seq_puts(seq, ",jqfmt=vfsv0");
728 	}
729 #endif
730 
731 	/* Block allocator options */
732 	if (opts & (1 << REISERFS_NO_BORDER))
733 		seq_puts(seq, ",block-allocator=noborder");
734 	if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
735 		seq_puts(seq, ",block-allocator=no_unhashed_relocation");
736 	if (opts & (1 << REISERFS_HASHED_RELOCATION))
737 		seq_puts(seq, ",block-allocator=hashed_relocation");
738 	if (opts & (1 << REISERFS_TEST4))
739 		seq_puts(seq, ",block-allocator=test4");
740 	show_alloc_options(seq, s);
741 	return 0;
742 }
743 
744 #ifdef CONFIG_QUOTA
745 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
746 				    size_t, loff_t);
747 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
748 				   loff_t);
749 #endif
750 
751 static const struct super_operations reiserfs_sops = {
752 	.alloc_inode = reiserfs_alloc_inode,
753 	.destroy_inode = reiserfs_destroy_inode,
754 	.write_inode = reiserfs_write_inode,
755 	.dirty_inode = reiserfs_dirty_inode,
756 	.evict_inode = reiserfs_evict_inode,
757 	.put_super = reiserfs_put_super,
758 	.sync_fs = reiserfs_sync_fs,
759 	.freeze_fs = reiserfs_freeze,
760 	.unfreeze_fs = reiserfs_unfreeze,
761 	.statfs = reiserfs_statfs,
762 	.remount_fs = reiserfs_remount,
763 	.show_options = reiserfs_show_options,
764 #ifdef CONFIG_QUOTA
765 	.quota_read = reiserfs_quota_read,
766 	.quota_write = reiserfs_quota_write,
767 #endif
768 };
769 
770 #ifdef CONFIG_QUOTA
771 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
772 
773 static int reiserfs_write_dquot(struct dquot *);
774 static int reiserfs_acquire_dquot(struct dquot *);
775 static int reiserfs_release_dquot(struct dquot *);
776 static int reiserfs_mark_dquot_dirty(struct dquot *);
777 static int reiserfs_write_info(struct super_block *, int);
778 static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
779 
780 static const struct dquot_operations reiserfs_quota_operations = {
781 	.write_dquot = reiserfs_write_dquot,
782 	.acquire_dquot = reiserfs_acquire_dquot,
783 	.release_dquot = reiserfs_release_dquot,
784 	.mark_dirty = reiserfs_mark_dquot_dirty,
785 	.write_info = reiserfs_write_info,
786 	.alloc_dquot	= dquot_alloc,
787 	.destroy_dquot	= dquot_destroy,
788 };
789 
790 static const struct quotactl_ops reiserfs_qctl_operations = {
791 	.quota_on = reiserfs_quota_on,
792 	.quota_off = dquot_quota_off,
793 	.quota_sync = dquot_quota_sync,
794 	.get_info = dquot_get_dqinfo,
795 	.set_info = dquot_set_dqinfo,
796 	.get_dqblk = dquot_get_dqblk,
797 	.set_dqblk = dquot_set_dqblk,
798 };
799 #endif
800 
801 static const struct export_operations reiserfs_export_ops = {
802 	.encode_fh = reiserfs_encode_fh,
803 	.fh_to_dentry = reiserfs_fh_to_dentry,
804 	.fh_to_parent = reiserfs_fh_to_parent,
805 	.get_parent = reiserfs_get_parent,
806 };
807 
808 /*
809  * this struct is used in reiserfs_getopt () for containing the value for
810  * those mount options that have values rather than being toggles.
811  */
812 typedef struct {
813 	char *value;
814 	/*
815 	 * bitmask which is to set on mount_options bitmask
816 	 * when this value is found, 0 is no bits are to be changed.
817 	 */
818 	int setmask;
819 	/*
820 	 * bitmask which is to clear on mount_options bitmask
821 	 * when this value is found, 0 is no bits are to be changed.
822 	 * This is applied BEFORE setmask
823 	 */
824 	int clrmask;
825 } arg_desc_t;
826 
827 /* Set this bit in arg_required to allow empty arguments */
828 #define REISERFS_OPT_ALLOWEMPTY 31
829 
830 /*
831  * this struct is used in reiserfs_getopt() for describing the
832  * set of reiserfs mount options
833  */
834 typedef struct {
835 	char *option_name;
836 
837 	/* 0 if argument is not required, not 0 otherwise */
838 	int arg_required;
839 
840 	/* list of values accepted by an option */
841 	const arg_desc_t *values;
842 
843 	/*
844 	 * bitmask which is to set on mount_options bitmask
845 	 * when this value is found, 0 is no bits are to be changed.
846 	 */
847 	int setmask;
848 
849 	/*
850 	 * bitmask which is to clear on mount_options bitmask
851 	 * when this value is found, 0 is no bits are to be changed.
852 	 * This is applied BEFORE setmask
853 	 */
854 	int clrmask;
855 } opt_desc_t;
856 
857 /* possible values for -o data= */
858 static const arg_desc_t logging_mode[] = {
859 	{"ordered", 1 << REISERFS_DATA_ORDERED,
860 	 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
861 	{"journal", 1 << REISERFS_DATA_LOG,
862 	 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
863 	{"writeback", 1 << REISERFS_DATA_WRITEBACK,
864 	 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
865 	{.value = NULL}
866 };
867 
868 /* possible values for -o barrier= */
869 static const arg_desc_t barrier_mode[] = {
870 	{"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
871 	{"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
872 	{.value = NULL}
873 };
874 
875 /*
876  * possible values for "-o block-allocator=" and bits which are to be set in
877  * s_mount_opt of reiserfs specific part of in-core super block
878  */
879 static const arg_desc_t balloc[] = {
880 	{"noborder", 1 << REISERFS_NO_BORDER, 0},
881 	{"border", 0, 1 << REISERFS_NO_BORDER},
882 	{"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
883 	{"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
884 	{"test4", 1 << REISERFS_TEST4, 0},
885 	{"notest4", 0, 1 << REISERFS_TEST4},
886 	{NULL, 0, 0}
887 };
888 
889 static const arg_desc_t tails[] = {
890 	{"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
891 	{"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
892 	{"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
893 	{NULL, 0, 0}
894 };
895 
896 static const arg_desc_t error_actions[] = {
897 	{"panic", 1 << REISERFS_ERROR_PANIC,
898 	 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
899 	{"ro-remount", 1 << REISERFS_ERROR_RO,
900 	 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
901 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
902 	{"continue", 1 << REISERFS_ERROR_CONTINUE,
903 	 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
904 #endif
905 	{NULL, 0, 0},
906 };
907 
908 /*
909  * proceed only one option from a list *cur - string containing of mount
910  * options
911  * opts - array of options which are accepted
912  * opt_arg - if option is found and requires an argument and if it is specifed
913  * in the input - pointer to the argument is stored here
914  * bit_flags - if option requires to set a certain bit - it is set here
915  * return -1 if unknown option is found, opt->arg_required otherwise
916  */
917 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
918 			   char **opt_arg, unsigned long *bit_flags)
919 {
920 	char *p;
921 	/*
922 	 * foo=bar,
923 	 * ^   ^  ^
924 	 * |   |  +-- option_end
925 	 * |   +-- arg_start
926 	 * +-- option_start
927 	 */
928 	const opt_desc_t *opt;
929 	const arg_desc_t *arg;
930 
931 	p = *cur;
932 
933 	/* assume argument cannot contain commas */
934 	*cur = strchr(p, ',');
935 	if (*cur) {
936 		*(*cur) = '\0';
937 		(*cur)++;
938 	}
939 
940 	if (!strncmp(p, "alloc=", 6)) {
941 		/*
942 		 * Ugly special case, probably we should redo options
943 		 * parser so that it can understand several arguments for
944 		 * some options, also so that it can fill several bitfields
945 		 * with option values.
946 		 */
947 		if (reiserfs_parse_alloc_options(s, p + 6)) {
948 			return -1;
949 		} else {
950 			return 0;
951 		}
952 	}
953 
954 	/* for every option in the list */
955 	for (opt = opts; opt->option_name; opt++) {
956 		if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
957 			if (bit_flags) {
958 				if (opt->clrmask ==
959 				    (1 << REISERFS_UNSUPPORTED_OPT))
960 					reiserfs_warning(s, "super-6500",
961 							 "%s not supported.\n",
962 							 p);
963 				else
964 					*bit_flags &= ~opt->clrmask;
965 				if (opt->setmask ==
966 				    (1 << REISERFS_UNSUPPORTED_OPT))
967 					reiserfs_warning(s, "super-6501",
968 							 "%s not supported.\n",
969 							 p);
970 				else
971 					*bit_flags |= opt->setmask;
972 			}
973 			break;
974 		}
975 	}
976 	if (!opt->option_name) {
977 		reiserfs_warning(s, "super-6502",
978 				 "unknown mount option \"%s\"", p);
979 		return -1;
980 	}
981 
982 	p += strlen(opt->option_name);
983 	switch (*p) {
984 	case '=':
985 		if (!opt->arg_required) {
986 			reiserfs_warning(s, "super-6503",
987 					 "the option \"%s\" does not "
988 					 "require an argument\n",
989 					 opt->option_name);
990 			return -1;
991 		}
992 		break;
993 
994 	case 0:
995 		if (opt->arg_required) {
996 			reiserfs_warning(s, "super-6504",
997 					 "the option \"%s\" requires an "
998 					 "argument\n", opt->option_name);
999 			return -1;
1000 		}
1001 		break;
1002 	default:
1003 		reiserfs_warning(s, "super-6505",
1004 				 "head of option \"%s\" is only correct\n",
1005 				 opt->option_name);
1006 		return -1;
1007 	}
1008 
1009 	/*
1010 	 * move to the argument, or to next option if argument is not
1011 	 * required
1012 	 */
1013 	p++;
1014 
1015 	if (opt->arg_required
1016 	    && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1017 	    && !strlen(p)) {
1018 		/* this catches "option=," if not allowed */
1019 		reiserfs_warning(s, "super-6506",
1020 				 "empty argument for \"%s\"\n",
1021 				 opt->option_name);
1022 		return -1;
1023 	}
1024 
1025 	if (!opt->values) {
1026 		/* *=NULLopt_arg contains pointer to argument */
1027 		*opt_arg = p;
1028 		return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1029 	}
1030 
1031 	/* values possible for this option are listed in opt->values */
1032 	for (arg = opt->values; arg->value; arg++) {
1033 		if (!strcmp(p, arg->value)) {
1034 			if (bit_flags) {
1035 				*bit_flags &= ~arg->clrmask;
1036 				*bit_flags |= arg->setmask;
1037 			}
1038 			return opt->arg_required;
1039 		}
1040 	}
1041 
1042 	reiserfs_warning(s, "super-6506",
1043 			 "bad value \"%s\" for option \"%s\"\n", p,
1044 			 opt->option_name);
1045 	return -1;
1046 }
1047 
1048 /* returns 0 if something is wrong in option string, 1 - otherwise */
1049 static int reiserfs_parse_options(struct super_block *s,
1050 
1051 				  /* string given via mount's -o */
1052 				  char *options,
1053 
1054 				  /*
1055 				   * after the parsing phase, contains the
1056 				   * collection of bitflags defining what
1057 				   * mount options were selected.
1058 				   */
1059 				  unsigned long *mount_options,
1060 
1061 				  /* strtol-ed from NNN of resize=NNN */
1062 				  unsigned long *blocks,
1063 				  char **jdev_name,
1064 				  unsigned int *commit_max_age,
1065 				  char **qf_names,
1066 				  unsigned int *qfmt)
1067 {
1068 	int c;
1069 	char *arg = NULL;
1070 	char *pos;
1071 	opt_desc_t opts[] = {
1072 		/*
1073 		 * Compatibility stuff, so that -o notail for old
1074 		 * setups still work
1075 		 */
1076 		{"tails",.arg_required = 't',.values = tails},
1077 		{"notail",.clrmask =
1078 		 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1079 		{"conv",.setmask = 1 << REISERFS_CONVERT},
1080 		{"attrs",.setmask = 1 << REISERFS_ATTRS},
1081 		{"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1082 		{"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1083 #ifdef CONFIG_REISERFS_FS_XATTR
1084 		{"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1085 		{"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1086 #else
1087 		{"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1088 		{"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1089 #endif
1090 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1091 		{"acl",.setmask = 1 << REISERFS_POSIXACL},
1092 		{"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1093 #else
1094 		{"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1095 		{"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1096 #endif
1097 		{.option_name = "nolog"},
1098 		{"replayonly",.setmask = 1 << REPLAYONLY},
1099 		{"block-allocator",.arg_required = 'a',.values = balloc},
1100 		{"data",.arg_required = 'd',.values = logging_mode},
1101 		{"barrier",.arg_required = 'b',.values = barrier_mode},
1102 		{"resize",.arg_required = 'r',.values = NULL},
1103 		{"jdev",.arg_required = 'j',.values = NULL},
1104 		{"nolargeio",.arg_required = 'w',.values = NULL},
1105 		{"commit",.arg_required = 'c',.values = NULL},
1106 		{"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1107 		{"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1108 		{"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1109 		{"errors",.arg_required = 'e',.values = error_actions},
1110 		{"usrjquota",.arg_required =
1111 		 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1112 		{"grpjquota",.arg_required =
1113 		 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1114 		{"jqfmt",.arg_required = 'f',.values = NULL},
1115 		{.option_name = NULL}
1116 	};
1117 
1118 	*blocks = 0;
1119 	if (!options || !*options)
1120 		/*
1121 		 * use default configuration: create tails, journaling on, no
1122 		 * conversion to newest format
1123 		 */
1124 		return 1;
1125 
1126 	for (pos = options; pos;) {
1127 		c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1128 		if (c == -1)
1129 			/* wrong option is given */
1130 			return 0;
1131 
1132 		if (c == 'r') {
1133 			char *p;
1134 
1135 			p = NULL;
1136 			/* "resize=NNN" or "resize=auto" */
1137 
1138 			if (!strcmp(arg, "auto")) {
1139 				/* From JFS code, to auto-get the size. */
1140 				*blocks =
1141 				    s->s_bdev->bd_inode->i_size >> s->
1142 				    s_blocksize_bits;
1143 			} else {
1144 				*blocks = simple_strtoul(arg, &p, 0);
1145 				if (*p != '\0') {
1146 					/* NNN does not look like a number */
1147 					reiserfs_warning(s, "super-6507",
1148 							 "bad value %s for "
1149 							 "-oresize\n", arg);
1150 					return 0;
1151 				}
1152 			}
1153 		}
1154 
1155 		if (c == 'c') {
1156 			char *p = NULL;
1157 			unsigned long val = simple_strtoul(arg, &p, 0);
1158 			/* commit=NNN (time in seconds) */
1159 			if (*p != '\0' || val >= (unsigned int)-1) {
1160 				reiserfs_warning(s, "super-6508",
1161 						 "bad value %s for -ocommit\n",
1162 						 arg);
1163 				return 0;
1164 			}
1165 			*commit_max_age = (unsigned int)val;
1166 		}
1167 
1168 		if (c == 'w') {
1169 			reiserfs_warning(s, "super-6509", "nolargeio option "
1170 					 "is no longer supported");
1171 			return 0;
1172 		}
1173 
1174 		if (c == 'j') {
1175 			if (arg && *arg && jdev_name) {
1176 				/* Hm, already assigned? */
1177 				if (*jdev_name) {
1178 					reiserfs_warning(s, "super-6510",
1179 							 "journal device was "
1180 							 "already specified to "
1181 							 "be %s", *jdev_name);
1182 					return 0;
1183 				}
1184 				*jdev_name = arg;
1185 			}
1186 		}
1187 #ifdef CONFIG_QUOTA
1188 		if (c == 'u' || c == 'g') {
1189 			int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1190 
1191 			if (sb_any_quota_loaded(s) &&
1192 			    (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1193 				reiserfs_warning(s, "super-6511",
1194 						 "cannot change journaled "
1195 						 "quota options when quota "
1196 						 "turned on.");
1197 				return 0;
1198 			}
1199 			if (*arg) {	/* Some filename specified? */
1200 				if (REISERFS_SB(s)->s_qf_names[qtype]
1201 				    && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1202 					      arg)) {
1203 					reiserfs_warning(s, "super-6512",
1204 							 "%s quota file "
1205 							 "already specified.",
1206 							 QTYPE2NAME(qtype));
1207 					return 0;
1208 				}
1209 				if (strchr(arg, '/')) {
1210 					reiserfs_warning(s, "super-6513",
1211 							 "quotafile must be "
1212 							 "on filesystem root.");
1213 					return 0;
1214 				}
1215 				qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1216 				if (!qf_names[qtype]) {
1217 					reiserfs_warning(s, "reiserfs-2502",
1218 							 "not enough memory "
1219 							 "for storing "
1220 							 "quotafile name.");
1221 					return 0;
1222 				}
1223 				if (qtype == USRQUOTA)
1224 					*mount_options |= 1 << REISERFS_USRQUOTA;
1225 				else
1226 					*mount_options |= 1 << REISERFS_GRPQUOTA;
1227 			} else {
1228 				if (qf_names[qtype] !=
1229 				    REISERFS_SB(s)->s_qf_names[qtype])
1230 					kfree(qf_names[qtype]);
1231 				qf_names[qtype] = NULL;
1232 				if (qtype == USRQUOTA)
1233 					*mount_options &= ~(1 << REISERFS_USRQUOTA);
1234 				else
1235 					*mount_options &= ~(1 << REISERFS_GRPQUOTA);
1236 			}
1237 		}
1238 		if (c == 'f') {
1239 			if (!strcmp(arg, "vfsold"))
1240 				*qfmt = QFMT_VFS_OLD;
1241 			else if (!strcmp(arg, "vfsv0"))
1242 				*qfmt = QFMT_VFS_V0;
1243 			else {
1244 				reiserfs_warning(s, "super-6514",
1245 						 "unknown quota format "
1246 						 "specified.");
1247 				return 0;
1248 			}
1249 			if (sb_any_quota_loaded(s) &&
1250 			    *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1251 				reiserfs_warning(s, "super-6515",
1252 						 "cannot change journaled "
1253 						 "quota options when quota "
1254 						 "turned on.");
1255 				return 0;
1256 			}
1257 		}
1258 #else
1259 		if (c == 'u' || c == 'g' || c == 'f') {
1260 			reiserfs_warning(s, "reiserfs-2503", "journaled "
1261 					 "quota options not supported.");
1262 			return 0;
1263 		}
1264 #endif
1265 	}
1266 
1267 #ifdef CONFIG_QUOTA
1268 	if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1269 	    && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1270 		reiserfs_warning(s, "super-6515",
1271 				 "journaled quota format not specified.");
1272 		return 0;
1273 	}
1274 	if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1275 	       sb_has_quota_loaded(s, USRQUOTA)) ||
1276 	    (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1277 	       sb_has_quota_loaded(s, GRPQUOTA))) {
1278 		reiserfs_warning(s, "super-6516", "quota options must "
1279 				 "be present when quota is turned on.");
1280 		return 0;
1281 	}
1282 #endif
1283 
1284 	return 1;
1285 }
1286 
1287 static void switch_data_mode(struct super_block *s, unsigned long mode)
1288 {
1289 	REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1290 					 (1 << REISERFS_DATA_ORDERED) |
1291 					 (1 << REISERFS_DATA_WRITEBACK));
1292 	REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1293 }
1294 
1295 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1296 {
1297 	if (mount_options & (1 << REISERFS_DATA_LOG)) {
1298 		if (!reiserfs_data_log(s)) {
1299 			switch_data_mode(s, REISERFS_DATA_LOG);
1300 			reiserfs_info(s, "switching to journaled data mode\n");
1301 		}
1302 	} else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1303 		if (!reiserfs_data_ordered(s)) {
1304 			switch_data_mode(s, REISERFS_DATA_ORDERED);
1305 			reiserfs_info(s, "switching to ordered data mode\n");
1306 		}
1307 	} else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1308 		if (!reiserfs_data_writeback(s)) {
1309 			switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1310 			reiserfs_info(s, "switching to writeback data mode\n");
1311 		}
1312 	}
1313 }
1314 
1315 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1316 {
1317 	int flush = (1 << REISERFS_BARRIER_FLUSH);
1318 	int none = (1 << REISERFS_BARRIER_NONE);
1319 	int all_barrier = flush | none;
1320 
1321 	if (bits & all_barrier) {
1322 		REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1323 		if (bits & flush) {
1324 			REISERFS_SB(s)->s_mount_opt |= flush;
1325 			printk("reiserfs: enabling write barrier flush mode\n");
1326 		} else if (bits & none) {
1327 			REISERFS_SB(s)->s_mount_opt |= none;
1328 			printk("reiserfs: write barriers turned off\n");
1329 		}
1330 	}
1331 }
1332 
1333 static void handle_attrs(struct super_block *s)
1334 {
1335 	struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1336 
1337 	if (reiserfs_attrs(s)) {
1338 		if (old_format_only(s)) {
1339 			reiserfs_warning(s, "super-6517", "cannot support "
1340 					 "attributes on 3.5.x disk format");
1341 			REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1342 			return;
1343 		}
1344 		if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1345 			reiserfs_warning(s, "super-6518", "cannot support "
1346 					 "attributes until flag is set in "
1347 					 "super-block");
1348 			REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1349 		}
1350 	}
1351 }
1352 
1353 #ifdef CONFIG_QUOTA
1354 static void handle_quota_files(struct super_block *s, char **qf_names,
1355 			       unsigned int *qfmt)
1356 {
1357 	int i;
1358 
1359 	for (i = 0; i < MAXQUOTAS; i++) {
1360 		if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1361 			kfree(REISERFS_SB(s)->s_qf_names[i]);
1362 		REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1363 	}
1364 	if (*qfmt)
1365 		REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1366 }
1367 #endif
1368 
1369 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1370 {
1371 	struct reiserfs_super_block *rs;
1372 	struct reiserfs_transaction_handle th;
1373 	unsigned long blocks;
1374 	unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1375 	unsigned long safe_mask = 0;
1376 	unsigned int commit_max_age = (unsigned int)-1;
1377 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1378 	char *new_opts = kstrdup(arg, GFP_KERNEL);
1379 	int err;
1380 	char *qf_names[MAXQUOTAS];
1381 	unsigned int qfmt = 0;
1382 #ifdef CONFIG_QUOTA
1383 	int i;
1384 #endif
1385 
1386 	sync_filesystem(s);
1387 	reiserfs_write_lock(s);
1388 
1389 #ifdef CONFIG_QUOTA
1390 	memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1391 #endif
1392 
1393 	rs = SB_DISK_SUPER_BLOCK(s);
1394 
1395 	if (!reiserfs_parse_options
1396 	    (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1397 	    qf_names, &qfmt)) {
1398 #ifdef CONFIG_QUOTA
1399 		for (i = 0; i < MAXQUOTAS; i++)
1400 			if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1401 				kfree(qf_names[i]);
1402 #endif
1403 		err = -EINVAL;
1404 		goto out_err_unlock;
1405 	}
1406 #ifdef CONFIG_QUOTA
1407 	handle_quota_files(s, qf_names, &qfmt);
1408 #endif
1409 
1410 	handle_attrs(s);
1411 
1412 	/* Add options that are safe here */
1413 	safe_mask |= 1 << REISERFS_SMALLTAIL;
1414 	safe_mask |= 1 << REISERFS_LARGETAIL;
1415 	safe_mask |= 1 << REISERFS_NO_BORDER;
1416 	safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1417 	safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1418 	safe_mask |= 1 << REISERFS_TEST4;
1419 	safe_mask |= 1 << REISERFS_ATTRS;
1420 	safe_mask |= 1 << REISERFS_XATTRS_USER;
1421 	safe_mask |= 1 << REISERFS_POSIXACL;
1422 	safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1423 	safe_mask |= 1 << REISERFS_BARRIER_NONE;
1424 	safe_mask |= 1 << REISERFS_ERROR_RO;
1425 	safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1426 	safe_mask |= 1 << REISERFS_ERROR_PANIC;
1427 	safe_mask |= 1 << REISERFS_USRQUOTA;
1428 	safe_mask |= 1 << REISERFS_GRPQUOTA;
1429 
1430 	/*
1431 	 * Update the bitmask, taking care to keep
1432 	 * the bits we're not allowed to change here
1433 	 */
1434 	REISERFS_SB(s)->s_mount_opt =
1435 	    (REISERFS_SB(s)->
1436 	     s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1437 
1438 	if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1439 		journal->j_max_commit_age = commit_max_age;
1440 		journal->j_max_trans_age = commit_max_age;
1441 	} else if (commit_max_age == 0) {
1442 		/* 0 means restore defaults. */
1443 		journal->j_max_commit_age = journal->j_default_max_commit_age;
1444 		journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1445 	}
1446 
1447 	if (blocks) {
1448 		err = reiserfs_resize(s, blocks);
1449 		if (err != 0)
1450 			goto out_err_unlock;
1451 	}
1452 
1453 	if (*mount_flags & MS_RDONLY) {
1454 		reiserfs_write_unlock(s);
1455 		reiserfs_xattr_init(s, *mount_flags);
1456 		/* remount read-only */
1457 		if (s->s_flags & MS_RDONLY)
1458 			/* it is read-only already */
1459 			goto out_ok_unlocked;
1460 
1461 		err = dquot_suspend(s, -1);
1462 		if (err < 0)
1463 			goto out_err;
1464 
1465 		/* try to remount file system with read-only permissions */
1466 		if (sb_umount_state(rs) == REISERFS_VALID_FS
1467 		    || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1468 			goto out_ok_unlocked;
1469 		}
1470 
1471 		reiserfs_write_lock(s);
1472 
1473 		err = journal_begin(&th, s, 10);
1474 		if (err)
1475 			goto out_err_unlock;
1476 
1477 		/* Mounting a rw partition read-only. */
1478 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1479 		set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1480 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1481 	} else {
1482 		/* remount read-write */
1483 		if (!(s->s_flags & MS_RDONLY)) {
1484 			reiserfs_write_unlock(s);
1485 			reiserfs_xattr_init(s, *mount_flags);
1486 			goto out_ok_unlocked;	/* We are read-write already */
1487 		}
1488 
1489 		if (reiserfs_is_journal_aborted(journal)) {
1490 			err = journal->j_errno;
1491 			goto out_err_unlock;
1492 		}
1493 
1494 		handle_data_mode(s, mount_options);
1495 		handle_barrier_mode(s, mount_options);
1496 		REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1497 
1498 		/* now it is safe to call journal_begin */
1499 		s->s_flags &= ~MS_RDONLY;
1500 		err = journal_begin(&th, s, 10);
1501 		if (err)
1502 			goto out_err_unlock;
1503 
1504 		/* Mount a partition which is read-only, read-write */
1505 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1506 		REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1507 		s->s_flags &= ~MS_RDONLY;
1508 		set_sb_umount_state(rs, REISERFS_ERROR_FS);
1509 		if (!old_format_only(s))
1510 			set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1511 		/* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1512 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1513 		REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1514 	}
1515 	/* this will force a full flush of all journal lists */
1516 	SB_JOURNAL(s)->j_must_wait = 1;
1517 	err = journal_end(&th);
1518 	if (err)
1519 		goto out_err_unlock;
1520 
1521 	reiserfs_write_unlock(s);
1522 	if (!(*mount_flags & MS_RDONLY)) {
1523 		dquot_resume(s, -1);
1524 		reiserfs_write_lock(s);
1525 		finish_unfinished(s);
1526 		reiserfs_write_unlock(s);
1527 		reiserfs_xattr_init(s, *mount_flags);
1528 	}
1529 
1530 out_ok_unlocked:
1531 	replace_mount_options(s, new_opts);
1532 	return 0;
1533 
1534 out_err_unlock:
1535 	reiserfs_write_unlock(s);
1536 out_err:
1537 	kfree(new_opts);
1538 	return err;
1539 }
1540 
1541 static int read_super_block(struct super_block *s, int offset)
1542 {
1543 	struct buffer_head *bh;
1544 	struct reiserfs_super_block *rs;
1545 	int fs_blocksize;
1546 
1547 	bh = sb_bread(s, offset / s->s_blocksize);
1548 	if (!bh) {
1549 		reiserfs_warning(s, "sh-2006",
1550 				 "bread failed (dev %s, block %lu, size %lu)",
1551 				 s->s_id, offset / s->s_blocksize,
1552 				 s->s_blocksize);
1553 		return 1;
1554 	}
1555 
1556 	rs = (struct reiserfs_super_block *)bh->b_data;
1557 	if (!is_any_reiserfs_magic_string(rs)) {
1558 		brelse(bh);
1559 		return 1;
1560 	}
1561 	/*
1562 	 * ok, reiserfs signature (old or new) found in at the given offset
1563 	 */
1564 	fs_blocksize = sb_blocksize(rs);
1565 	brelse(bh);
1566 	sb_set_blocksize(s, fs_blocksize);
1567 
1568 	bh = sb_bread(s, offset / s->s_blocksize);
1569 	if (!bh) {
1570 		reiserfs_warning(s, "sh-2007",
1571 				 "bread failed (dev %s, block %lu, size %lu)",
1572 				 s->s_id, offset / s->s_blocksize,
1573 				 s->s_blocksize);
1574 		return 1;
1575 	}
1576 
1577 	rs = (struct reiserfs_super_block *)bh->b_data;
1578 	if (sb_blocksize(rs) != s->s_blocksize) {
1579 		reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1580 				 "filesystem on (dev %s, block %Lu, size %lu)",
1581 				 s->s_id,
1582 				 (unsigned long long)bh->b_blocknr,
1583 				 s->s_blocksize);
1584 		brelse(bh);
1585 		return 1;
1586 	}
1587 
1588 	if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1589 		brelse(bh);
1590 		reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1591 				 "--rebuild-tree run detected. Please run\n"
1592 				 "reiserfsck --rebuild-tree and wait for a "
1593 				 "completion. If that fails\n"
1594 				 "get newer reiserfsprogs package");
1595 		return 1;
1596 	}
1597 
1598 	SB_BUFFER_WITH_SB(s) = bh;
1599 	SB_DISK_SUPER_BLOCK(s) = rs;
1600 
1601 	/*
1602 	 * magic is of non-standard journal filesystem, look at s_version to
1603 	 * find which format is in use
1604 	 */
1605 	if (is_reiserfs_jr(rs)) {
1606 		if (sb_version(rs) == REISERFS_VERSION_2)
1607 			reiserfs_info(s, "found reiserfs format \"3.6\""
1608 				      " with non-standard journal\n");
1609 		else if (sb_version(rs) == REISERFS_VERSION_1)
1610 			reiserfs_info(s, "found reiserfs format \"3.5\""
1611 				      " with non-standard journal\n");
1612 		else {
1613 			reiserfs_warning(s, "sh-2012", "found unknown "
1614 					 "format \"%u\" of reiserfs with "
1615 					 "non-standard magic", sb_version(rs));
1616 			return 1;
1617 		}
1618 	} else
1619 		/*
1620 		 * s_version of standard format may contain incorrect
1621 		 * information, so we just look at the magic string
1622 		 */
1623 		reiserfs_info(s,
1624 			      "found reiserfs format \"%s\" with standard journal\n",
1625 			      is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1626 
1627 	s->s_op = &reiserfs_sops;
1628 	s->s_export_op = &reiserfs_export_ops;
1629 #ifdef CONFIG_QUOTA
1630 	s->s_qcop = &reiserfs_qctl_operations;
1631 	s->dq_op = &reiserfs_quota_operations;
1632 #endif
1633 
1634 	/*
1635 	 * new format is limited by the 32 bit wide i_blocks field, want to
1636 	 * be one full block below that.
1637 	 */
1638 	s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1639 	return 0;
1640 }
1641 
1642 /* after journal replay, reread all bitmap and super blocks */
1643 static int reread_meta_blocks(struct super_block *s)
1644 {
1645 	ll_rw_block(READ, 1, &SB_BUFFER_WITH_SB(s));
1646 	wait_on_buffer(SB_BUFFER_WITH_SB(s));
1647 	if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1648 		reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1649 		return 1;
1650 	}
1651 
1652 	return 0;
1653 }
1654 
1655 /* hash detection stuff */
1656 
1657 /*
1658  * if root directory is empty - we set default - Yura's - hash and
1659  * warn about it
1660  * FIXME: we look for only one name in a directory. If tea and yura
1661  * both have the same value - we ask user to send report to the
1662  * mailing list
1663  */
1664 static __u32 find_hash_out(struct super_block *s)
1665 {
1666 	int retval;
1667 	struct inode *inode;
1668 	struct cpu_key key;
1669 	INITIALIZE_PATH(path);
1670 	struct reiserfs_dir_entry de;
1671 	struct reiserfs_de_head *deh;
1672 	__u32 hash = DEFAULT_HASH;
1673 	__u32 deh_hashval, teahash, r5hash, yurahash;
1674 
1675 	inode = s->s_root->d_inode;
1676 
1677 	make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1678 	retval = search_by_entry_key(s, &key, &path, &de);
1679 	if (retval == IO_ERROR) {
1680 		pathrelse(&path);
1681 		return UNSET_HASH;
1682 	}
1683 	if (retval == NAME_NOT_FOUND)
1684 		de.de_entry_num--;
1685 
1686 	set_de_name_and_namelen(&de);
1687 	deh = de.de_deh + de.de_entry_num;
1688 
1689 	if (deh_offset(deh) == DOT_DOT_OFFSET) {
1690 		/* allow override in this case */
1691 		if (reiserfs_rupasov_hash(s))
1692 			hash = YURA_HASH;
1693 		reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1694 		goto out;
1695 	}
1696 
1697 	deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1698 	r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1699 	teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1700 	yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1701 
1702 	if ((teahash == r5hash && deh_hashval == r5hash) ||
1703 	    (teahash == yurahash && deh_hashval == yurahash) ||
1704 	    (r5hash == yurahash && deh_hashval == yurahash)) {
1705 		reiserfs_warning(s, "reiserfs-2506",
1706 				 "Unable to automatically detect hash "
1707 				 "function. Please mount with -o "
1708 				 "hash={tea,rupasov,r5}");
1709 		hash = UNSET_HASH;
1710 		goto out;
1711 	}
1712 
1713 	if (deh_hashval == yurahash)
1714 		hash = YURA_HASH;
1715 	else if (deh_hashval == teahash)
1716 		hash = TEA_HASH;
1717 	else if (deh_hashval == r5hash)
1718 		hash = R5_HASH;
1719 	else {
1720 		reiserfs_warning(s, "reiserfs-2506",
1721 				 "Unrecognised hash function");
1722 		hash = UNSET_HASH;
1723 	}
1724 out:
1725 	pathrelse(&path);
1726 	return hash;
1727 }
1728 
1729 /* finds out which hash names are sorted with */
1730 static int what_hash(struct super_block *s)
1731 {
1732 	__u32 code;
1733 
1734 	code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1735 
1736 	/*
1737 	 * reiserfs_hash_detect() == true if any of the hash mount options
1738 	 * were used.  We must check them to make sure the user isn't
1739 	 * using a bad hash value
1740 	 */
1741 	if (code == UNSET_HASH || reiserfs_hash_detect(s))
1742 		code = find_hash_out(s);
1743 
1744 	if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1745 		/*
1746 		 * detection has found the hash, and we must check against the
1747 		 * mount options
1748 		 */
1749 		if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1750 			reiserfs_warning(s, "reiserfs-2507",
1751 					 "Error, %s hash detected, "
1752 					 "unable to force rupasov hash",
1753 					 reiserfs_hashname(code));
1754 			code = UNSET_HASH;
1755 		} else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1756 			reiserfs_warning(s, "reiserfs-2508",
1757 					 "Error, %s hash detected, "
1758 					 "unable to force tea hash",
1759 					 reiserfs_hashname(code));
1760 			code = UNSET_HASH;
1761 		} else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1762 			reiserfs_warning(s, "reiserfs-2509",
1763 					 "Error, %s hash detected, "
1764 					 "unable to force r5 hash",
1765 					 reiserfs_hashname(code));
1766 			code = UNSET_HASH;
1767 		}
1768 	} else {
1769 		/*
1770 		 * find_hash_out was not called or
1771 		 * could not determine the hash
1772 		 */
1773 		if (reiserfs_rupasov_hash(s)) {
1774 			code = YURA_HASH;
1775 		} else if (reiserfs_tea_hash(s)) {
1776 			code = TEA_HASH;
1777 		} else if (reiserfs_r5_hash(s)) {
1778 			code = R5_HASH;
1779 		}
1780 	}
1781 
1782 	/*
1783 	 * if we are mounted RW, and we have a new valid hash code, update
1784 	 * the super
1785 	 */
1786 	if (code != UNSET_HASH &&
1787 	    !(s->s_flags & MS_RDONLY) &&
1788 	    code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1789 		set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1790 	}
1791 	return code;
1792 }
1793 
1794 /* return pointer to appropriate function */
1795 static hashf_t hash_function(struct super_block *s)
1796 {
1797 	switch (what_hash(s)) {
1798 	case TEA_HASH:
1799 		reiserfs_info(s, "Using tea hash to sort names\n");
1800 		return keyed_hash;
1801 	case YURA_HASH:
1802 		reiserfs_info(s, "Using rupasov hash to sort names\n");
1803 		return yura_hash;
1804 	case R5_HASH:
1805 		reiserfs_info(s, "Using r5 hash to sort names\n");
1806 		return r5_hash;
1807 	}
1808 	return NULL;
1809 }
1810 
1811 /* this is used to set up correct value for old partitions */
1812 static int function2code(hashf_t func)
1813 {
1814 	if (func == keyed_hash)
1815 		return TEA_HASH;
1816 	if (func == yura_hash)
1817 		return YURA_HASH;
1818 	if (func == r5_hash)
1819 		return R5_HASH;
1820 
1821 	BUG();			/* should never happen */
1822 
1823 	return 0;
1824 }
1825 
1826 #define SWARN(silent, s, id, ...)			\
1827 	if (!(silent))				\
1828 		reiserfs_warning(s, id, __VA_ARGS__)
1829 
1830 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1831 {
1832 	struct inode *root_inode;
1833 	struct reiserfs_transaction_handle th;
1834 	int old_format = 0;
1835 	unsigned long blocks;
1836 	unsigned int commit_max_age = 0;
1837 	int jinit_done = 0;
1838 	struct reiserfs_iget_args args;
1839 	struct reiserfs_super_block *rs;
1840 	char *jdev_name;
1841 	struct reiserfs_sb_info *sbi;
1842 	int errval = -EINVAL;
1843 	char *qf_names[MAXQUOTAS] = {};
1844 	unsigned int qfmt = 0;
1845 
1846 	save_mount_options(s, data);
1847 
1848 	sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1849 	if (!sbi)
1850 		return -ENOMEM;
1851 	s->s_fs_info = sbi;
1852 	/* Set default values for options: non-aggressive tails, RO on errors */
1853 	sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1854 	sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1855 	sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1856 	/* no preallocation minimum, be smart in reiserfs_file_write instead */
1857 	sbi->s_alloc_options.preallocmin = 0;
1858 	/* Preallocate by 16 blocks (17-1) at once */
1859 	sbi->s_alloc_options.preallocsize = 17;
1860 	/* setup default block allocator options */
1861 	reiserfs_init_alloc_options(s);
1862 
1863 	spin_lock_init(&sbi->old_work_lock);
1864 	INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1865 	mutex_init(&sbi->lock);
1866 	sbi->lock_depth = -1;
1867 
1868 	sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1869 					 s->s_id);
1870 	if (!sbi->commit_wq) {
1871 		SWARN(silent, s, "", "Cannot allocate commit workqueue");
1872 		errval = -ENOMEM;
1873 		goto error_unlocked;
1874 	}
1875 
1876 	jdev_name = NULL;
1877 	if (reiserfs_parse_options
1878 	    (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1879 	     &commit_max_age, qf_names, &qfmt) == 0) {
1880 		goto error_unlocked;
1881 	}
1882 	if (jdev_name && jdev_name[0]) {
1883 		sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1884 		if (!sbi->s_jdev) {
1885 			SWARN(silent, s, "", "Cannot allocate memory for "
1886 				"journal device name");
1887 			goto error;
1888 		}
1889 	}
1890 #ifdef CONFIG_QUOTA
1891 	handle_quota_files(s, qf_names, &qfmt);
1892 #endif
1893 
1894 	if (blocks) {
1895 		SWARN(silent, s, "jmacd-7", "resize option for remount only");
1896 		goto error_unlocked;
1897 	}
1898 
1899 	/*
1900 	 * try old format (undistributed bitmap, super block in 8-th 1k
1901 	 * block of a device)
1902 	 */
1903 	if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1904 		old_format = 1;
1905 
1906 	/*
1907 	 * try new format (64-th 1k block), which can contain reiserfs
1908 	 * super block
1909 	 */
1910 	else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1911 		SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1912 		      s->s_id);
1913 		goto error_unlocked;
1914 	}
1915 
1916 	rs = SB_DISK_SUPER_BLOCK(s);
1917 	/*
1918 	 * Let's do basic sanity check to verify that underlying device is not
1919 	 * smaller than the filesystem. If the check fails then abort and
1920 	 * scream, because bad stuff will happen otherwise.
1921 	 */
1922 	if (s->s_bdev && s->s_bdev->bd_inode
1923 	    && i_size_read(s->s_bdev->bd_inode) <
1924 	    sb_block_count(rs) * sb_blocksize(rs)) {
1925 		SWARN(silent, s, "", "Filesystem cannot be "
1926 		      "mounted because it is bigger than the device");
1927 		SWARN(silent, s, "", "You may need to run fsck "
1928 		      "or increase size of your LVM partition");
1929 		SWARN(silent, s, "", "Or may be you forgot to "
1930 		      "reboot after fdisk when it told you to");
1931 		goto error_unlocked;
1932 	}
1933 
1934 	sbi->s_mount_state = SB_REISERFS_STATE(s);
1935 	sbi->s_mount_state = REISERFS_VALID_FS;
1936 
1937 	if ((errval = reiserfs_init_bitmap_cache(s))) {
1938 		SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1939 		goto error_unlocked;
1940 	}
1941 
1942 	errval = -EINVAL;
1943 #ifdef CONFIG_REISERFS_CHECK
1944 	SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1945 	SWARN(silent, s, "", "- it is slow mode for debugging.");
1946 #endif
1947 
1948 	/* make data=ordered the default */
1949 	if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1950 	    !reiserfs_data_writeback(s)) {
1951 		sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1952 	}
1953 
1954 	if (reiserfs_data_log(s)) {
1955 		reiserfs_info(s, "using journaled data mode\n");
1956 	} else if (reiserfs_data_ordered(s)) {
1957 		reiserfs_info(s, "using ordered data mode\n");
1958 	} else {
1959 		reiserfs_info(s, "using writeback data mode\n");
1960 	}
1961 	if (reiserfs_barrier_flush(s)) {
1962 		printk("reiserfs: using flush barriers\n");
1963 	}
1964 
1965 	if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1966 		SWARN(silent, s, "sh-2022",
1967 		      "unable to initialize journal space");
1968 		goto error_unlocked;
1969 	} else {
1970 		/*
1971 		 * once this is set, journal_release must be called
1972 		 * if we error out of the mount
1973 		 */
1974 		jinit_done = 1;
1975 	}
1976 
1977 	if (reread_meta_blocks(s)) {
1978 		SWARN(silent, s, "jmacd-9",
1979 		      "unable to reread meta blocks after journal init");
1980 		goto error_unlocked;
1981 	}
1982 
1983 	if (replay_only(s))
1984 		goto error_unlocked;
1985 
1986 	if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1987 		SWARN(silent, s, "clm-7000",
1988 		      "Detected readonly device, marking FS readonly");
1989 		s->s_flags |= MS_RDONLY;
1990 	}
1991 	args.objectid = REISERFS_ROOT_OBJECTID;
1992 	args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1993 	root_inode =
1994 	    iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1995 			 reiserfs_init_locked_inode, (void *)&args);
1996 	if (!root_inode) {
1997 		SWARN(silent, s, "jmacd-10", "get root inode failed");
1998 		goto error_unlocked;
1999 	}
2000 
2001 	/*
2002 	 * This path assumed to be called with the BKL in the old times.
2003 	 * Now we have inherited the big reiserfs lock from it and many
2004 	 * reiserfs helpers called in the mount path and elsewhere require
2005 	 * this lock to be held even if it's not always necessary. Let's be
2006 	 * conservative and hold it early. The window can be reduced after
2007 	 * careful review of the code.
2008 	 */
2009 	reiserfs_write_lock(s);
2010 
2011 	if (root_inode->i_state & I_NEW) {
2012 		reiserfs_read_locked_inode(root_inode, &args);
2013 		unlock_new_inode(root_inode);
2014 	}
2015 
2016 	s->s_root = d_make_root(root_inode);
2017 	if (!s->s_root)
2018 		goto error;
2019 	/* define and initialize hash function */
2020 	sbi->s_hash_function = hash_function(s);
2021 	if (sbi->s_hash_function == NULL) {
2022 		dput(s->s_root);
2023 		s->s_root = NULL;
2024 		goto error;
2025 	}
2026 
2027 	if (is_reiserfs_3_5(rs)
2028 	    || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2029 		set_bit(REISERFS_3_5, &sbi->s_properties);
2030 	else if (old_format)
2031 		set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2032 	else
2033 		set_bit(REISERFS_3_6, &sbi->s_properties);
2034 
2035 	if (!(s->s_flags & MS_RDONLY)) {
2036 
2037 		errval = journal_begin(&th, s, 1);
2038 		if (errval) {
2039 			dput(s->s_root);
2040 			s->s_root = NULL;
2041 			goto error;
2042 		}
2043 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2044 
2045 		set_sb_umount_state(rs, REISERFS_ERROR_FS);
2046 		set_sb_fs_state(rs, 0);
2047 
2048 		/*
2049 		 * Clear out s_bmap_nr if it would wrap. We can handle this
2050 		 * case, but older revisions can't. This will cause the
2051 		 * file system to fail mount on those older implementations,
2052 		 * avoiding corruption. -jeffm
2053 		 */
2054 		if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2055 		    sb_bmap_nr(rs) != 0) {
2056 			reiserfs_warning(s, "super-2030", "This file system "
2057 					"claims to use %u bitmap blocks in "
2058 					"its super block, but requires %u. "
2059 					"Clearing to zero.", sb_bmap_nr(rs),
2060 					reiserfs_bmap_count(s));
2061 
2062 			set_sb_bmap_nr(rs, 0);
2063 		}
2064 
2065 		if (old_format_only(s)) {
2066 			/*
2067 			 * filesystem of format 3.5 either with standard
2068 			 * or non-standard journal
2069 			 */
2070 			if (convert_reiserfs(s)) {
2071 				/* and -o conv is given */
2072 				if (!silent)
2073 					reiserfs_info(s,
2074 						      "converting 3.5 filesystem to the 3.6 format");
2075 
2076 				if (is_reiserfs_3_5(rs))
2077 					/*
2078 					 * put magic string of 3.6 format.
2079 					 * 2.2 will not be able to
2080 					 * mount this filesystem anymore
2081 					 */
2082 					memcpy(rs->s_v1.s_magic,
2083 					       reiserfs_3_6_magic_string,
2084 					       sizeof
2085 					       (reiserfs_3_6_magic_string));
2086 
2087 				set_sb_version(rs, REISERFS_VERSION_2);
2088 				reiserfs_convert_objectid_map_v1(s);
2089 				set_bit(REISERFS_3_6, &sbi->s_properties);
2090 				clear_bit(REISERFS_3_5, &sbi->s_properties);
2091 			} else if (!silent) {
2092 				reiserfs_info(s, "using 3.5.x disk format\n");
2093 			}
2094 		} else
2095 			set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2096 
2097 
2098 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2099 		errval = journal_end(&th);
2100 		if (errval) {
2101 			dput(s->s_root);
2102 			s->s_root = NULL;
2103 			goto error;
2104 		}
2105 
2106 		reiserfs_write_unlock(s);
2107 		if ((errval = reiserfs_lookup_privroot(s)) ||
2108 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2109 			dput(s->s_root);
2110 			s->s_root = NULL;
2111 			goto error_unlocked;
2112 		}
2113 		reiserfs_write_lock(s);
2114 
2115 		/*
2116 		 * look for files which were to be removed in previous session
2117 		 */
2118 		finish_unfinished(s);
2119 	} else {
2120 		if (old_format_only(s) && !silent) {
2121 			reiserfs_info(s, "using 3.5.x disk format\n");
2122 		}
2123 
2124 		reiserfs_write_unlock(s);
2125 		if ((errval = reiserfs_lookup_privroot(s)) ||
2126 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2127 			dput(s->s_root);
2128 			s->s_root = NULL;
2129 			goto error_unlocked;
2130 		}
2131 		reiserfs_write_lock(s);
2132 	}
2133 	/*
2134 	 * mark hash in super block: it could be unset. overwrite should be ok
2135 	 */
2136 	set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2137 
2138 	handle_attrs(s);
2139 
2140 	reiserfs_proc_info_init(s);
2141 
2142 	init_waitqueue_head(&(sbi->s_wait));
2143 	spin_lock_init(&sbi->bitmap_lock);
2144 
2145 	reiserfs_write_unlock(s);
2146 
2147 	return (0);
2148 
2149 error:
2150 	reiserfs_write_unlock(s);
2151 
2152 error_unlocked:
2153 	/* kill the commit thread, free journal ram */
2154 	if (jinit_done) {
2155 		reiserfs_write_lock(s);
2156 		journal_release_error(NULL, s);
2157 		reiserfs_write_unlock(s);
2158 	}
2159 
2160 	cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2161 
2162 	reiserfs_free_bitmap_cache(s);
2163 	if (SB_BUFFER_WITH_SB(s))
2164 		brelse(SB_BUFFER_WITH_SB(s));
2165 #ifdef CONFIG_QUOTA
2166 	{
2167 		int j;
2168 		for (j = 0; j < MAXQUOTAS; j++)
2169 			kfree(qf_names[j]);
2170 	}
2171 #endif
2172 	kfree(sbi);
2173 
2174 	s->s_fs_info = NULL;
2175 	return errval;
2176 }
2177 
2178 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2179 {
2180 	struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2181 
2182 	buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2183 	buf->f_bfree = sb_free_blocks(rs);
2184 	buf->f_bavail = buf->f_bfree;
2185 	buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2186 	buf->f_bsize = dentry->d_sb->s_blocksize;
2187 	/* changed to accommodate gcc folks. */
2188 	buf->f_type = REISERFS_SUPER_MAGIC;
2189 	buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2190 	buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2191 				sizeof(rs->s_uuid)/2);
2192 
2193 	return 0;
2194 }
2195 
2196 #ifdef CONFIG_QUOTA
2197 static int reiserfs_write_dquot(struct dquot *dquot)
2198 {
2199 	struct reiserfs_transaction_handle th;
2200 	int ret, err;
2201 	int depth;
2202 
2203 	reiserfs_write_lock(dquot->dq_sb);
2204 	ret =
2205 	    journal_begin(&th, dquot->dq_sb,
2206 			  REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2207 	if (ret)
2208 		goto out;
2209 	depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2210 	ret = dquot_commit(dquot);
2211 	reiserfs_write_lock_nested(dquot->dq_sb, depth);
2212 	err = journal_end(&th);
2213 	if (!ret && err)
2214 		ret = err;
2215 out:
2216 	reiserfs_write_unlock(dquot->dq_sb);
2217 	return ret;
2218 }
2219 
2220 static int reiserfs_acquire_dquot(struct dquot *dquot)
2221 {
2222 	struct reiserfs_transaction_handle th;
2223 	int ret, err;
2224 	int depth;
2225 
2226 	reiserfs_write_lock(dquot->dq_sb);
2227 	ret =
2228 	    journal_begin(&th, dquot->dq_sb,
2229 			  REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2230 	if (ret)
2231 		goto out;
2232 	depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2233 	ret = dquot_acquire(dquot);
2234 	reiserfs_write_lock_nested(dquot->dq_sb, depth);
2235 	err = journal_end(&th);
2236 	if (!ret && err)
2237 		ret = err;
2238 out:
2239 	reiserfs_write_unlock(dquot->dq_sb);
2240 	return ret;
2241 }
2242 
2243 static int reiserfs_release_dquot(struct dquot *dquot)
2244 {
2245 	struct reiserfs_transaction_handle th;
2246 	int ret, err;
2247 
2248 	reiserfs_write_lock(dquot->dq_sb);
2249 	ret =
2250 	    journal_begin(&th, dquot->dq_sb,
2251 			  REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2252 	reiserfs_write_unlock(dquot->dq_sb);
2253 	if (ret) {
2254 		/* Release dquot anyway to avoid endless cycle in dqput() */
2255 		dquot_release(dquot);
2256 		goto out;
2257 	}
2258 	ret = dquot_release(dquot);
2259 	reiserfs_write_lock(dquot->dq_sb);
2260 	err = journal_end(&th);
2261 	if (!ret && err)
2262 		ret = err;
2263 	reiserfs_write_unlock(dquot->dq_sb);
2264 out:
2265 	return ret;
2266 }
2267 
2268 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2269 {
2270 	/* Are we journaling quotas? */
2271 	if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2272 	    REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2273 		dquot_mark_dquot_dirty(dquot);
2274 		return reiserfs_write_dquot(dquot);
2275 	} else
2276 		return dquot_mark_dquot_dirty(dquot);
2277 }
2278 
2279 static int reiserfs_write_info(struct super_block *sb, int type)
2280 {
2281 	struct reiserfs_transaction_handle th;
2282 	int ret, err;
2283 	int depth;
2284 
2285 	/* Data block + inode block */
2286 	reiserfs_write_lock(sb);
2287 	ret = journal_begin(&th, sb, 2);
2288 	if (ret)
2289 		goto out;
2290 	depth = reiserfs_write_unlock_nested(sb);
2291 	ret = dquot_commit_info(sb, type);
2292 	reiserfs_write_lock_nested(sb, depth);
2293 	err = journal_end(&th);
2294 	if (!ret && err)
2295 		ret = err;
2296 out:
2297 	reiserfs_write_unlock(sb);
2298 	return ret;
2299 }
2300 
2301 /*
2302  * Turn on quotas during mount time - we need to find the quota file and such...
2303  */
2304 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2305 {
2306 	return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2307 					REISERFS_SB(sb)->s_jquota_fmt, type);
2308 }
2309 
2310 /*
2311  * Standard function to be called on quota_on
2312  */
2313 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2314 			     struct path *path)
2315 {
2316 	int err;
2317 	struct inode *inode;
2318 	struct reiserfs_transaction_handle th;
2319 	int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2320 
2321 	reiserfs_write_lock(sb);
2322 	if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2323 		err = -EINVAL;
2324 		goto out;
2325 	}
2326 
2327 	/* Quotafile not on the same filesystem? */
2328 	if (path->dentry->d_sb != sb) {
2329 		err = -EXDEV;
2330 		goto out;
2331 	}
2332 	inode = path->dentry->d_inode;
2333 	/*
2334 	 * We must not pack tails for quota files on reiserfs for quota
2335 	 * IO to work
2336 	 */
2337 	if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2338 		err = reiserfs_unpack(inode, NULL);
2339 		if (err) {
2340 			reiserfs_warning(sb, "super-6520",
2341 				"Unpacking tail of quota file failed"
2342 				" (%d). Cannot turn on quotas.", err);
2343 			err = -EINVAL;
2344 			goto out;
2345 		}
2346 		mark_inode_dirty(inode);
2347 	}
2348 	/* Journaling quota? */
2349 	if (REISERFS_SB(sb)->s_qf_names[type]) {
2350 		/* Quotafile not of fs root? */
2351 		if (path->dentry->d_parent != sb->s_root)
2352 			reiserfs_warning(sb, "super-6521",
2353 				 "Quota file not on filesystem root. "
2354 				 "Journalled quota will not work.");
2355 	}
2356 
2357 	/*
2358 	 * When we journal data on quota file, we have to flush journal to see
2359 	 * all updates to the file when we bypass pagecache...
2360 	 */
2361 	if (reiserfs_file_data_log(inode)) {
2362 		/* Just start temporary transaction and finish it */
2363 		err = journal_begin(&th, sb, 1);
2364 		if (err)
2365 			goto out;
2366 		err = journal_end_sync(&th);
2367 		if (err)
2368 			goto out;
2369 	}
2370 	reiserfs_write_unlock(sb);
2371 	return dquot_quota_on(sb, type, format_id, path);
2372 out:
2373 	reiserfs_write_unlock(sb);
2374 	return err;
2375 }
2376 
2377 /*
2378  * Read data from quotafile - avoid pagecache and such because we cannot afford
2379  * acquiring the locks... As quota files are never truncated and quota code
2380  * itself serializes the operations (and no one else should touch the files)
2381  * we don't have to be afraid of races
2382  */
2383 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2384 				   size_t len, loff_t off)
2385 {
2386 	struct inode *inode = sb_dqopt(sb)->files[type];
2387 	unsigned long blk = off >> sb->s_blocksize_bits;
2388 	int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2389 	size_t toread;
2390 	struct buffer_head tmp_bh, *bh;
2391 	loff_t i_size = i_size_read(inode);
2392 
2393 	if (off > i_size)
2394 		return 0;
2395 	if (off + len > i_size)
2396 		len = i_size - off;
2397 	toread = len;
2398 	while (toread > 0) {
2399 		tocopy =
2400 		    sb->s_blocksize - offset <
2401 		    toread ? sb->s_blocksize - offset : toread;
2402 		tmp_bh.b_state = 0;
2403 		/*
2404 		 * Quota files are without tails so we can safely
2405 		 * use this function
2406 		 */
2407 		reiserfs_write_lock(sb);
2408 		err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2409 		reiserfs_write_unlock(sb);
2410 		if (err)
2411 			return err;
2412 		if (!buffer_mapped(&tmp_bh))	/* A hole? */
2413 			memset(data, 0, tocopy);
2414 		else {
2415 			bh = sb_bread(sb, tmp_bh.b_blocknr);
2416 			if (!bh)
2417 				return -EIO;
2418 			memcpy(data, bh->b_data + offset, tocopy);
2419 			brelse(bh);
2420 		}
2421 		offset = 0;
2422 		toread -= tocopy;
2423 		data += tocopy;
2424 		blk++;
2425 	}
2426 	return len;
2427 }
2428 
2429 /*
2430  * Write to quotafile (we know the transaction is already started and has
2431  * enough credits)
2432  */
2433 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2434 				    const char *data, size_t len, loff_t off)
2435 {
2436 	struct inode *inode = sb_dqopt(sb)->files[type];
2437 	unsigned long blk = off >> sb->s_blocksize_bits;
2438 	int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2439 	int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2440 	size_t towrite = len;
2441 	struct buffer_head tmp_bh, *bh;
2442 
2443 	if (!current->journal_info) {
2444 		printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2445 			" cancelled because transaction is not started.\n",
2446 			(unsigned long long)off, (unsigned long long)len);
2447 		return -EIO;
2448 	}
2449 	while (towrite > 0) {
2450 		tocopy = sb->s_blocksize - offset < towrite ?
2451 		    sb->s_blocksize - offset : towrite;
2452 		tmp_bh.b_state = 0;
2453 		reiserfs_write_lock(sb);
2454 		err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2455 		reiserfs_write_unlock(sb);
2456 		if (err)
2457 			goto out;
2458 		if (offset || tocopy != sb->s_blocksize)
2459 			bh = sb_bread(sb, tmp_bh.b_blocknr);
2460 		else
2461 			bh = sb_getblk(sb, tmp_bh.b_blocknr);
2462 		if (!bh) {
2463 			err = -EIO;
2464 			goto out;
2465 		}
2466 		lock_buffer(bh);
2467 		memcpy(bh->b_data + offset, data, tocopy);
2468 		flush_dcache_page(bh->b_page);
2469 		set_buffer_uptodate(bh);
2470 		unlock_buffer(bh);
2471 		reiserfs_write_lock(sb);
2472 		reiserfs_prepare_for_journal(sb, bh, 1);
2473 		journal_mark_dirty(current->journal_info, bh);
2474 		if (!journal_quota)
2475 			reiserfs_add_ordered_list(inode, bh);
2476 		reiserfs_write_unlock(sb);
2477 		brelse(bh);
2478 		offset = 0;
2479 		towrite -= tocopy;
2480 		data += tocopy;
2481 		blk++;
2482 	}
2483 out:
2484 	if (len == towrite)
2485 		return err;
2486 	if (inode->i_size < off + len - towrite)
2487 		i_size_write(inode, off + len - towrite);
2488 	inode->i_version++;
2489 	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2490 	mark_inode_dirty(inode);
2491 	return len - towrite;
2492 }
2493 
2494 #endif
2495 
2496 static struct dentry *get_super_block(struct file_system_type *fs_type,
2497 			   int flags, const char *dev_name,
2498 			   void *data)
2499 {
2500 	return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2501 }
2502 
2503 static int __init init_reiserfs_fs(void)
2504 {
2505 	int ret;
2506 
2507 	ret = init_inodecache();
2508 	if (ret)
2509 		return ret;
2510 
2511 	reiserfs_proc_info_global_init();
2512 
2513 	ret = register_filesystem(&reiserfs_fs_type);
2514 	if (ret)
2515 		goto out;
2516 
2517 	return 0;
2518 out:
2519 	reiserfs_proc_info_global_done();
2520 	destroy_inodecache();
2521 
2522 	return ret;
2523 }
2524 
2525 static void __exit exit_reiserfs_fs(void)
2526 {
2527 	reiserfs_proc_info_global_done();
2528 	unregister_filesystem(&reiserfs_fs_type);
2529 	destroy_inodecache();
2530 }
2531 
2532 struct file_system_type reiserfs_fs_type = {
2533 	.owner = THIS_MODULE,
2534 	.name = "reiserfs",
2535 	.mount = get_super_block,
2536 	.kill_sb = reiserfs_kill_sb,
2537 	.fs_flags = FS_REQUIRES_DEV,
2538 };
2539 MODULE_ALIAS_FS("reiserfs");
2540 
2541 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2542 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2543 MODULE_LICENSE("GPL");
2544 
2545 module_init(init_reiserfs_fs);
2546 module_exit(exit_reiserfs_fs);
2547