xref: /openbmc/linux/fs/reiserfs/super.c (revision 42954c37)
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13 
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <linux/uaccess.h>
19 #include "reiserfs.h"
20 #include "acl.h"
21 #include "xattr.h"
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/backing-dev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/exportfs.h>
27 #include <linux/quotaops.h>
28 #include <linux/vfs.h>
29 #include <linux/mount.h>
30 #include <linux/namei.h>
31 #include <linux/crc32.h>
32 #include <linux/seq_file.h>
33 
34 struct file_system_type reiserfs_fs_type;
35 
36 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
37 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
38 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
39 
is_reiserfs_3_5(struct reiserfs_super_block * rs)40 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
41 {
42 	return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
43 			strlen(reiserfs_3_5_magic_string));
44 }
45 
is_reiserfs_3_6(struct reiserfs_super_block * rs)46 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
47 {
48 	return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
49 			strlen(reiserfs_3_6_magic_string));
50 }
51 
is_reiserfs_jr(struct reiserfs_super_block * rs)52 int is_reiserfs_jr(struct reiserfs_super_block *rs)
53 {
54 	return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
55 			strlen(reiserfs_jr_magic_string));
56 }
57 
is_any_reiserfs_magic_string(struct reiserfs_super_block * rs)58 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
59 {
60 	return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
61 		is_reiserfs_jr(rs));
62 }
63 
64 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
65 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
66 
reiserfs_sync_fs(struct super_block * s,int wait)67 static int reiserfs_sync_fs(struct super_block *s, int wait)
68 {
69 	struct reiserfs_transaction_handle th;
70 
71 	/*
72 	 * Writeback quota in non-journalled quota case - journalled quota has
73 	 * no dirty dquots
74 	 */
75 	dquot_writeback_dquots(s, -1);
76 	reiserfs_write_lock(s);
77 	if (!journal_begin(&th, s, 1))
78 		if (!journal_end_sync(&th))
79 			reiserfs_flush_old_commits(s);
80 	reiserfs_write_unlock(s);
81 	return 0;
82 }
83 
flush_old_commits(struct work_struct * work)84 static void flush_old_commits(struct work_struct *work)
85 {
86 	struct reiserfs_sb_info *sbi;
87 	struct super_block *s;
88 
89 	sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
90 	s = sbi->s_journal->j_work_sb;
91 
92 	/*
93 	 * We need s_umount for protecting quota writeback. We have to use
94 	 * trylock as reiserfs_cancel_old_flush() may be waiting for this work
95 	 * to complete with s_umount held.
96 	 */
97 	if (!down_read_trylock(&s->s_umount)) {
98 		/* Requeue work if we are not cancelling it */
99 		spin_lock(&sbi->old_work_lock);
100 		if (sbi->work_queued == 1)
101 			queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
102 		spin_unlock(&sbi->old_work_lock);
103 		return;
104 	}
105 	spin_lock(&sbi->old_work_lock);
106 	/* Avoid clobbering the cancel state... */
107 	if (sbi->work_queued == 1)
108 		sbi->work_queued = 0;
109 	spin_unlock(&sbi->old_work_lock);
110 
111 	reiserfs_sync_fs(s, 1);
112 	up_read(&s->s_umount);
113 }
114 
reiserfs_schedule_old_flush(struct super_block * s)115 void reiserfs_schedule_old_flush(struct super_block *s)
116 {
117 	struct reiserfs_sb_info *sbi = REISERFS_SB(s);
118 	unsigned long delay;
119 
120 	/*
121 	 * Avoid scheduling flush when sb is being shut down. It can race
122 	 * with journal shutdown and free still queued delayed work.
123 	 */
124 	if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
125 		return;
126 
127 	spin_lock(&sbi->old_work_lock);
128 	if (!sbi->work_queued) {
129 		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
130 		queue_delayed_work(system_long_wq, &sbi->old_work, delay);
131 		sbi->work_queued = 1;
132 	}
133 	spin_unlock(&sbi->old_work_lock);
134 }
135 
reiserfs_cancel_old_flush(struct super_block * s)136 void reiserfs_cancel_old_flush(struct super_block *s)
137 {
138 	struct reiserfs_sb_info *sbi = REISERFS_SB(s);
139 
140 	spin_lock(&sbi->old_work_lock);
141 	/* Make sure no new flushes will be queued */
142 	sbi->work_queued = 2;
143 	spin_unlock(&sbi->old_work_lock);
144 	cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
145 }
146 
reiserfs_freeze(struct super_block * s)147 static int reiserfs_freeze(struct super_block *s)
148 {
149 	struct reiserfs_transaction_handle th;
150 
151 	reiserfs_cancel_old_flush(s);
152 
153 	reiserfs_write_lock(s);
154 	if (!sb_rdonly(s)) {
155 		int err = journal_begin(&th, s, 1);
156 		if (err) {
157 			reiserfs_block_writes(&th);
158 		} else {
159 			reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
160 						     1);
161 			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
162 			reiserfs_block_writes(&th);
163 			journal_end_sync(&th);
164 		}
165 	}
166 	reiserfs_write_unlock(s);
167 	return 0;
168 }
169 
reiserfs_unfreeze(struct super_block * s)170 static int reiserfs_unfreeze(struct super_block *s)
171 {
172 	struct reiserfs_sb_info *sbi = REISERFS_SB(s);
173 
174 	reiserfs_allow_writes(s);
175 	spin_lock(&sbi->old_work_lock);
176 	/* Allow old_work to run again */
177 	sbi->work_queued = 0;
178 	spin_unlock(&sbi->old_work_lock);
179 	return 0;
180 }
181 
182 extern const struct in_core_key MAX_IN_CORE_KEY;
183 
184 /*
185  * this is used to delete "save link" when there are no items of a
186  * file it points to. It can either happen if unlink is completed but
187  * "save unlink" removal, or if file has both unlink and truncate
188  * pending and as unlink completes first (because key of "save link"
189  * protecting unlink is bigger that a key lf "save link" which
190  * protects truncate), so there left no items to make truncate
191  * completion on
192  */
remove_save_link_only(struct super_block * s,struct reiserfs_key * key,int oid_free)193 static int remove_save_link_only(struct super_block *s,
194 				 struct reiserfs_key *key, int oid_free)
195 {
196 	struct reiserfs_transaction_handle th;
197 	int err;
198 
199 	/* we are going to do one balancing */
200 	err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
201 	if (err)
202 		return err;
203 
204 	reiserfs_delete_solid_item(&th, NULL, key);
205 	if (oid_free)
206 		/* removals are protected by direct items */
207 		reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
208 
209 	return journal_end(&th);
210 }
211 
212 #ifdef CONFIG_QUOTA
213 static int reiserfs_quota_on_mount(struct super_block *, int);
214 #endif
215 
216 /*
217  * Look for uncompleted unlinks and truncates and complete them
218  *
219  * Called with superblock write locked.  If quotas are enabled, we have to
220  * release/retake lest we call dquot_quota_on_mount(), proceed to
221  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
222  * cpu worklets to complete flush_async_commits() that in turn wait for the
223  * superblock write lock.
224  */
finish_unfinished(struct super_block * s)225 static int finish_unfinished(struct super_block *s)
226 {
227 	INITIALIZE_PATH(path);
228 	struct cpu_key max_cpu_key, obj_key;
229 	struct reiserfs_key save_link_key, last_inode_key;
230 	int retval = 0;
231 	struct item_head *ih;
232 	struct buffer_head *bh;
233 	int item_pos;
234 	char *item;
235 	int done;
236 	struct inode *inode;
237 	int truncate;
238 #ifdef CONFIG_QUOTA
239 	int i;
240 	int ms_active_set;
241 	int quota_enabled[REISERFS_MAXQUOTAS];
242 #endif
243 
244 	/* compose key to look for "save" links */
245 	max_cpu_key.version = KEY_FORMAT_3_5;
246 	max_cpu_key.on_disk_key.k_dir_id = ~0U;
247 	max_cpu_key.on_disk_key.k_objectid = ~0U;
248 	set_cpu_key_k_offset(&max_cpu_key, ~0U);
249 	max_cpu_key.key_length = 3;
250 
251 	memset(&last_inode_key, 0, sizeof(last_inode_key));
252 
253 #ifdef CONFIG_QUOTA
254 	/* Needed for iput() to work correctly and not trash data */
255 	if (s->s_flags & SB_ACTIVE) {
256 		ms_active_set = 0;
257 	} else {
258 		ms_active_set = 1;
259 		s->s_flags |= SB_ACTIVE;
260 	}
261 	/* Turn on quotas so that they are updated correctly */
262 	for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
263 		quota_enabled[i] = 1;
264 		if (REISERFS_SB(s)->s_qf_names[i]) {
265 			int ret;
266 
267 			if (sb_has_quota_active(s, i)) {
268 				quota_enabled[i] = 0;
269 				continue;
270 			}
271 			reiserfs_write_unlock(s);
272 			ret = reiserfs_quota_on_mount(s, i);
273 			reiserfs_write_lock(s);
274 			if (ret < 0)
275 				reiserfs_warning(s, "reiserfs-2500",
276 						 "cannot turn on journaled "
277 						 "quota: error %d", ret);
278 		}
279 	}
280 #endif
281 
282 	done = 0;
283 	REISERFS_SB(s)->s_is_unlinked_ok = 1;
284 	while (!retval) {
285 		int depth;
286 		retval = search_item(s, &max_cpu_key, &path);
287 		if (retval != ITEM_NOT_FOUND) {
288 			reiserfs_error(s, "vs-2140",
289 				       "search_by_key returned %d", retval);
290 			break;
291 		}
292 
293 		bh = get_last_bh(&path);
294 		item_pos = get_item_pos(&path);
295 		if (item_pos != B_NR_ITEMS(bh)) {
296 			reiserfs_warning(s, "vs-2060",
297 					 "wrong position found");
298 			break;
299 		}
300 		item_pos--;
301 		ih = item_head(bh, item_pos);
302 
303 		if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
304 			/* there are no "save" links anymore */
305 			break;
306 
307 		save_link_key = ih->ih_key;
308 		if (is_indirect_le_ih(ih))
309 			truncate = 1;
310 		else
311 			truncate = 0;
312 
313 		/* reiserfs_iget needs k_dirid and k_objectid only */
314 		item = ih_item_body(bh, ih);
315 		obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
316 		obj_key.on_disk_key.k_objectid =
317 		    le32_to_cpu(ih->ih_key.k_objectid);
318 		obj_key.on_disk_key.k_offset = 0;
319 		obj_key.on_disk_key.k_type = 0;
320 
321 		pathrelse(&path);
322 
323 		inode = reiserfs_iget(s, &obj_key);
324 		if (IS_ERR_OR_NULL(inode)) {
325 			/*
326 			 * the unlink almost completed, it just did not
327 			 * manage to remove "save" link and release objectid
328 			 */
329 			reiserfs_warning(s, "vs-2180", "iget failed for %K",
330 					 &obj_key);
331 			retval = remove_save_link_only(s, &save_link_key, 1);
332 			continue;
333 		}
334 
335 		if (!truncate && inode->i_nlink) {
336 			/* file is not unlinked */
337 			reiserfs_warning(s, "vs-2185",
338 					 "file %K is not unlinked",
339 					 &obj_key);
340 			retval = remove_save_link_only(s, &save_link_key, 0);
341 			continue;
342 		}
343 		depth = reiserfs_write_unlock_nested(inode->i_sb);
344 		dquot_initialize(inode);
345 		reiserfs_write_lock_nested(inode->i_sb, depth);
346 
347 		if (truncate && S_ISDIR(inode->i_mode)) {
348 			/*
349 			 * We got a truncate request for a dir which
350 			 * is impossible.  The only imaginable way is to
351 			 * execute unfinished truncate request then boot
352 			 * into old kernel, remove the file and create dir
353 			 * with the same key.
354 			 */
355 			reiserfs_warning(s, "green-2101",
356 					 "impossible truncate on a "
357 					 "directory %k. Please report",
358 					 INODE_PKEY(inode));
359 			retval = remove_save_link_only(s, &save_link_key, 0);
360 			truncate = 0;
361 			iput(inode);
362 			continue;
363 		}
364 
365 		if (truncate) {
366 			REISERFS_I(inode)->i_flags |=
367 			    i_link_saved_truncate_mask;
368 			/*
369 			 * not completed truncate found. New size was
370 			 * committed together with "save" link
371 			 */
372 			reiserfs_info(s, "Truncating %k to %lld ..",
373 				      INODE_PKEY(inode), inode->i_size);
374 
375 			/* don't update modification time */
376 			reiserfs_truncate_file(inode, 0);
377 
378 			retval = remove_save_link(inode, truncate);
379 		} else {
380 			REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
381 			/* not completed unlink (rmdir) found */
382 			reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
383 			if (memcmp(&last_inode_key, INODE_PKEY(inode),
384 					sizeof(last_inode_key))){
385 				last_inode_key = *INODE_PKEY(inode);
386 				/* removal gets completed in iput */
387 				retval = 0;
388 			} else {
389 				reiserfs_warning(s, "super-2189", "Dead loop "
390 						 "in finish_unfinished "
391 						 "detected, just remove "
392 						 "save link\n");
393 				retval = remove_save_link_only(s,
394 							&save_link_key, 0);
395 			}
396 		}
397 
398 		iput(inode);
399 		printk("done\n");
400 		done++;
401 	}
402 	REISERFS_SB(s)->s_is_unlinked_ok = 0;
403 
404 #ifdef CONFIG_QUOTA
405 	/* Turn quotas off */
406 	reiserfs_write_unlock(s);
407 	for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
408 		if (sb_dqopt(s)->files[i] && quota_enabled[i])
409 			dquot_quota_off(s, i);
410 	}
411 	reiserfs_write_lock(s);
412 	if (ms_active_set)
413 		/* Restore the flag back */
414 		s->s_flags &= ~SB_ACTIVE;
415 #endif
416 	pathrelse(&path);
417 	if (done)
418 		reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
419 			      "Completed\n", done);
420 	return retval;
421 }
422 
423 /*
424  * to protect file being unlinked from getting lost we "safe" link files
425  * being unlinked. This link will be deleted in the same transaction with last
426  * item of file. mounting the filesystem we scan all these links and remove
427  * files which almost got lost
428  */
add_save_link(struct reiserfs_transaction_handle * th,struct inode * inode,int truncate)429 void add_save_link(struct reiserfs_transaction_handle *th,
430 		   struct inode *inode, int truncate)
431 {
432 	INITIALIZE_PATH(path);
433 	int retval;
434 	struct cpu_key key;
435 	struct item_head ih;
436 	__le32 link;
437 
438 	BUG_ON(!th->t_trans_id);
439 
440 	/* file can only get one "save link" of each kind */
441 	RFALSE(truncate &&
442 	       (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
443 	       "saved link already exists for truncated inode %lx",
444 	       (long)inode->i_ino);
445 	RFALSE(!truncate &&
446 	       (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
447 	       "saved link already exists for unlinked inode %lx",
448 	       (long)inode->i_ino);
449 
450 	/* setup key of "save" link */
451 	key.version = KEY_FORMAT_3_5;
452 	key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
453 	key.on_disk_key.k_objectid = inode->i_ino;
454 	if (!truncate) {
455 		/* unlink, rmdir, rename */
456 		set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
457 		set_cpu_key_k_type(&key, TYPE_DIRECT);
458 
459 		/* item head of "safe" link */
460 		make_le_item_head(&ih, &key, key.version,
461 				  1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
462 				  4 /*length */ , 0xffff /*free space */ );
463 	} else {
464 		/* truncate */
465 		if (S_ISDIR(inode->i_mode))
466 			reiserfs_warning(inode->i_sb, "green-2102",
467 					 "Adding a truncate savelink for "
468 					 "a directory %k! Please report",
469 					 INODE_PKEY(inode));
470 		set_cpu_key_k_offset(&key, 1);
471 		set_cpu_key_k_type(&key, TYPE_INDIRECT);
472 
473 		/* item head of "safe" link */
474 		make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
475 				  4 /*length */ , 0 /*free space */ );
476 	}
477 	key.key_length = 3;
478 
479 	/* look for its place in the tree */
480 	retval = search_item(inode->i_sb, &key, &path);
481 	if (retval != ITEM_NOT_FOUND) {
482 		if (retval != -ENOSPC)
483 			reiserfs_error(inode->i_sb, "vs-2100",
484 				       "search_by_key (%K) returned %d", &key,
485 				       retval);
486 		pathrelse(&path);
487 		return;
488 	}
489 
490 	/* body of "save" link */
491 	link = INODE_PKEY(inode)->k_dir_id;
492 
493 	/* put "save" link into tree, don't charge quota to anyone */
494 	retval =
495 	    reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
496 	if (retval) {
497 		if (retval != -ENOSPC)
498 			reiserfs_error(inode->i_sb, "vs-2120",
499 				       "insert_item returned %d", retval);
500 	} else {
501 		if (truncate)
502 			REISERFS_I(inode)->i_flags |=
503 			    i_link_saved_truncate_mask;
504 		else
505 			REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
506 	}
507 }
508 
509 /* this opens transaction unlike add_save_link */
remove_save_link(struct inode * inode,int truncate)510 int remove_save_link(struct inode *inode, int truncate)
511 {
512 	struct reiserfs_transaction_handle th;
513 	struct reiserfs_key key;
514 	int err;
515 
516 	/* we are going to do one balancing only */
517 	err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
518 	if (err)
519 		return err;
520 
521 	/* setup key of "save" link */
522 	key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
523 	key.k_objectid = INODE_PKEY(inode)->k_objectid;
524 	if (!truncate) {
525 		/* unlink, rmdir, rename */
526 		set_le_key_k_offset(KEY_FORMAT_3_5, &key,
527 				    1 + inode->i_sb->s_blocksize);
528 		set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
529 	} else {
530 		/* truncate */
531 		set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
532 		set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
533 	}
534 
535 	if ((truncate &&
536 	     (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
537 	    (!truncate &&
538 	     (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
539 		/* don't take quota bytes from anywhere */
540 		reiserfs_delete_solid_item(&th, NULL, &key);
541 	if (!truncate) {
542 		reiserfs_release_objectid(&th, inode->i_ino);
543 		REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
544 	} else
545 		REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
546 
547 	return journal_end(&th);
548 }
549 
reiserfs_kill_sb(struct super_block * s)550 static void reiserfs_kill_sb(struct super_block *s)
551 {
552 	if (REISERFS_SB(s)) {
553 		reiserfs_proc_info_done(s);
554 		/*
555 		 * Force any pending inode evictions to occur now. Any
556 		 * inodes to be removed that have extended attributes
557 		 * associated with them need to clean them up before
558 		 * we can release the extended attribute root dentries.
559 		 * shrink_dcache_for_umount will BUG if we don't release
560 		 * those before it's called so ->put_super is too late.
561 		 */
562 		shrink_dcache_sb(s);
563 
564 		dput(REISERFS_SB(s)->xattr_root);
565 		REISERFS_SB(s)->xattr_root = NULL;
566 		dput(REISERFS_SB(s)->priv_root);
567 		REISERFS_SB(s)->priv_root = NULL;
568 	}
569 
570 	kill_block_super(s);
571 }
572 
573 #ifdef CONFIG_QUOTA
574 static int reiserfs_quota_off(struct super_block *sb, int type);
575 
reiserfs_quota_off_umount(struct super_block * s)576 static void reiserfs_quota_off_umount(struct super_block *s)
577 {
578 	int type;
579 
580 	for (type = 0; type < REISERFS_MAXQUOTAS; type++)
581 		reiserfs_quota_off(s, type);
582 }
583 #else
reiserfs_quota_off_umount(struct super_block * s)584 static inline void reiserfs_quota_off_umount(struct super_block *s)
585 {
586 }
587 #endif
588 
reiserfs_put_super(struct super_block * s)589 static void reiserfs_put_super(struct super_block *s)
590 {
591 	struct reiserfs_transaction_handle th;
592 	th.t_trans_id = 0;
593 
594 	reiserfs_quota_off_umount(s);
595 
596 	reiserfs_write_lock(s);
597 
598 	/*
599 	 * change file system state to current state if it was mounted
600 	 * with read-write permissions
601 	 */
602 	if (!sb_rdonly(s)) {
603 		if (!journal_begin(&th, s, 10)) {
604 			reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
605 						     1);
606 			set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
607 					    REISERFS_SB(s)->s_mount_state);
608 			journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
609 		}
610 	}
611 
612 	/*
613 	 * note, journal_release checks for readonly mount, and can
614 	 * decide not to do a journal_end
615 	 */
616 	journal_release(&th, s);
617 
618 	reiserfs_free_bitmap_cache(s);
619 
620 	brelse(SB_BUFFER_WITH_SB(s));
621 
622 	print_statistics(s);
623 
624 	if (REISERFS_SB(s)->reserved_blocks != 0) {
625 		reiserfs_warning(s, "green-2005", "reserved blocks left %d",
626 				 REISERFS_SB(s)->reserved_blocks);
627 	}
628 
629 	reiserfs_write_unlock(s);
630 	mutex_destroy(&REISERFS_SB(s)->lock);
631 	destroy_workqueue(REISERFS_SB(s)->commit_wq);
632 	kfree(REISERFS_SB(s)->s_jdev);
633 	kfree(s->s_fs_info);
634 	s->s_fs_info = NULL;
635 }
636 
637 static struct kmem_cache *reiserfs_inode_cachep;
638 
reiserfs_alloc_inode(struct super_block * sb)639 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
640 {
641 	struct reiserfs_inode_info *ei;
642 	ei = alloc_inode_sb(sb, reiserfs_inode_cachep, GFP_KERNEL);
643 	if (!ei)
644 		return NULL;
645 	atomic_set(&ei->openers, 0);
646 	mutex_init(&ei->tailpack);
647 #ifdef CONFIG_QUOTA
648 	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
649 #endif
650 
651 	return &ei->vfs_inode;
652 }
653 
reiserfs_free_inode(struct inode * inode)654 static void reiserfs_free_inode(struct inode *inode)
655 {
656 	kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
657 }
658 
init_once(void * foo)659 static void init_once(void *foo)
660 {
661 	struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
662 
663 	INIT_LIST_HEAD(&ei->i_prealloc_list);
664 	inode_init_once(&ei->vfs_inode);
665 }
666 
init_inodecache(void)667 static int __init init_inodecache(void)
668 {
669 	reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
670 						  sizeof(struct
671 							 reiserfs_inode_info),
672 						  0, (SLAB_RECLAIM_ACCOUNT|
673 						      SLAB_MEM_SPREAD|
674 						      SLAB_ACCOUNT),
675 						  init_once);
676 	if (reiserfs_inode_cachep == NULL)
677 		return -ENOMEM;
678 	return 0;
679 }
680 
destroy_inodecache(void)681 static void destroy_inodecache(void)
682 {
683 	/*
684 	 * Make sure all delayed rcu free inodes are flushed before we
685 	 * destroy cache.
686 	 */
687 	rcu_barrier();
688 	kmem_cache_destroy(reiserfs_inode_cachep);
689 }
690 
691 /* we don't mark inodes dirty, we just log them */
reiserfs_dirty_inode(struct inode * inode,int flags)692 static void reiserfs_dirty_inode(struct inode *inode, int flags)
693 {
694 	struct reiserfs_transaction_handle th;
695 
696 	int err = 0;
697 
698 	if (sb_rdonly(inode->i_sb)) {
699 		reiserfs_warning(inode->i_sb, "clm-6006",
700 				 "writing inode %lu on readonly FS",
701 				 inode->i_ino);
702 		return;
703 	}
704 	reiserfs_write_lock(inode->i_sb);
705 
706 	/*
707 	 * this is really only used for atime updates, so they don't have
708 	 * to be included in O_SYNC or fsync
709 	 */
710 	err = journal_begin(&th, inode->i_sb, 1);
711 	if (err)
712 		goto out;
713 
714 	reiserfs_update_sd(&th, inode);
715 	journal_end(&th);
716 
717 out:
718 	reiserfs_write_unlock(inode->i_sb);
719 }
720 
reiserfs_show_options(struct seq_file * seq,struct dentry * root)721 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
722 {
723 	struct super_block *s = root->d_sb;
724 	struct reiserfs_journal *journal = SB_JOURNAL(s);
725 	long opts = REISERFS_SB(s)->s_mount_opt;
726 
727 	if (opts & (1 << REISERFS_LARGETAIL))
728 		seq_puts(seq, ",tails=on");
729 	else if (!(opts & (1 << REISERFS_SMALLTAIL)))
730 		seq_puts(seq, ",notail");
731 	/* tails=small is default so we don't show it */
732 
733 	if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
734 		seq_puts(seq, ",barrier=none");
735 	/* barrier=flush is default so we don't show it */
736 
737 	if (opts & (1 << REISERFS_ERROR_CONTINUE))
738 		seq_puts(seq, ",errors=continue");
739 	else if (opts & (1 << REISERFS_ERROR_PANIC))
740 		seq_puts(seq, ",errors=panic");
741 	/* errors=ro is default so we don't show it */
742 
743 	if (opts & (1 << REISERFS_DATA_LOG))
744 		seq_puts(seq, ",data=journal");
745 	else if (opts & (1 << REISERFS_DATA_WRITEBACK))
746 		seq_puts(seq, ",data=writeback");
747 	/* data=ordered is default so we don't show it */
748 
749 	if (opts & (1 << REISERFS_ATTRS))
750 		seq_puts(seq, ",attrs");
751 
752 	if (opts & (1 << REISERFS_XATTRS_USER))
753 		seq_puts(seq, ",user_xattr");
754 
755 	if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
756 		seq_puts(seq, ",expose_privroot");
757 
758 	if (opts & (1 << REISERFS_POSIXACL))
759 		seq_puts(seq, ",acl");
760 
761 	if (REISERFS_SB(s)->s_jdev)
762 		seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
763 
764 	if (journal->j_max_commit_age != journal->j_default_max_commit_age)
765 		seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
766 
767 #ifdef CONFIG_QUOTA
768 	if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
769 		seq_show_option(seq, "usrjquota",
770 				REISERFS_SB(s)->s_qf_names[USRQUOTA]);
771 	else if (opts & (1 << REISERFS_USRQUOTA))
772 		seq_puts(seq, ",usrquota");
773 	if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
774 		seq_show_option(seq, "grpjquota",
775 				REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
776 	else if (opts & (1 << REISERFS_GRPQUOTA))
777 		seq_puts(seq, ",grpquota");
778 	if (REISERFS_SB(s)->s_jquota_fmt) {
779 		if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
780 			seq_puts(seq, ",jqfmt=vfsold");
781 		else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
782 			seq_puts(seq, ",jqfmt=vfsv0");
783 	}
784 #endif
785 
786 	/* Block allocator options */
787 	if (opts & (1 << REISERFS_NO_BORDER))
788 		seq_puts(seq, ",block-allocator=noborder");
789 	if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
790 		seq_puts(seq, ",block-allocator=no_unhashed_relocation");
791 	if (opts & (1 << REISERFS_HASHED_RELOCATION))
792 		seq_puts(seq, ",block-allocator=hashed_relocation");
793 	if (opts & (1 << REISERFS_TEST4))
794 		seq_puts(seq, ",block-allocator=test4");
795 	show_alloc_options(seq, s);
796 	return 0;
797 }
798 
799 #ifdef CONFIG_QUOTA
800 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
801 				    size_t, loff_t);
802 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
803 				   loff_t);
804 
reiserfs_get_dquots(struct inode * inode)805 static struct dquot __rcu **reiserfs_get_dquots(struct inode *inode)
806 {
807 	return REISERFS_I(inode)->i_dquot;
808 }
809 #endif
810 
811 static const struct super_operations reiserfs_sops = {
812 	.alloc_inode = reiserfs_alloc_inode,
813 	.free_inode = reiserfs_free_inode,
814 	.write_inode = reiserfs_write_inode,
815 	.dirty_inode = reiserfs_dirty_inode,
816 	.evict_inode = reiserfs_evict_inode,
817 	.put_super = reiserfs_put_super,
818 	.sync_fs = reiserfs_sync_fs,
819 	.freeze_fs = reiserfs_freeze,
820 	.unfreeze_fs = reiserfs_unfreeze,
821 	.statfs = reiserfs_statfs,
822 	.remount_fs = reiserfs_remount,
823 	.show_options = reiserfs_show_options,
824 #ifdef CONFIG_QUOTA
825 	.quota_read = reiserfs_quota_read,
826 	.quota_write = reiserfs_quota_write,
827 	.get_dquots = reiserfs_get_dquots,
828 #endif
829 };
830 
831 #ifdef CONFIG_QUOTA
832 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
833 
834 static int reiserfs_write_dquot(struct dquot *);
835 static int reiserfs_acquire_dquot(struct dquot *);
836 static int reiserfs_release_dquot(struct dquot *);
837 static int reiserfs_mark_dquot_dirty(struct dquot *);
838 static int reiserfs_write_info(struct super_block *, int);
839 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
840 
841 static const struct dquot_operations reiserfs_quota_operations = {
842 	.write_dquot = reiserfs_write_dquot,
843 	.acquire_dquot = reiserfs_acquire_dquot,
844 	.release_dquot = reiserfs_release_dquot,
845 	.mark_dirty = reiserfs_mark_dquot_dirty,
846 	.write_info = reiserfs_write_info,
847 	.alloc_dquot	= dquot_alloc,
848 	.destroy_dquot	= dquot_destroy,
849 	.get_next_id	= dquot_get_next_id,
850 };
851 
852 static const struct quotactl_ops reiserfs_qctl_operations = {
853 	.quota_on = reiserfs_quota_on,
854 	.quota_off = reiserfs_quota_off,
855 	.quota_sync = dquot_quota_sync,
856 	.get_state = dquot_get_state,
857 	.set_info = dquot_set_dqinfo,
858 	.get_dqblk = dquot_get_dqblk,
859 	.set_dqblk = dquot_set_dqblk,
860 };
861 #endif
862 
863 static const struct export_operations reiserfs_export_ops = {
864 	.encode_fh = reiserfs_encode_fh,
865 	.fh_to_dentry = reiserfs_fh_to_dentry,
866 	.fh_to_parent = reiserfs_fh_to_parent,
867 	.get_parent = reiserfs_get_parent,
868 };
869 
870 /*
871  * this struct is used in reiserfs_getopt () for containing the value for
872  * those mount options that have values rather than being toggles.
873  */
874 typedef struct {
875 	char *value;
876 	/*
877 	 * bitmask which is to set on mount_options bitmask
878 	 * when this value is found, 0 is no bits are to be changed.
879 	 */
880 	int setmask;
881 	/*
882 	 * bitmask which is to clear on mount_options bitmask
883 	 * when this value is found, 0 is no bits are to be changed.
884 	 * This is applied BEFORE setmask
885 	 */
886 	int clrmask;
887 } arg_desc_t;
888 
889 /* Set this bit in arg_required to allow empty arguments */
890 #define REISERFS_OPT_ALLOWEMPTY 31
891 
892 /*
893  * this struct is used in reiserfs_getopt() for describing the
894  * set of reiserfs mount options
895  */
896 typedef struct {
897 	char *option_name;
898 
899 	/* 0 if argument is not required, not 0 otherwise */
900 	int arg_required;
901 
902 	/* list of values accepted by an option */
903 	const arg_desc_t *values;
904 
905 	/*
906 	 * bitmask which is to set on mount_options bitmask
907 	 * when this value is found, 0 is no bits are to be changed.
908 	 */
909 	int setmask;
910 
911 	/*
912 	 * bitmask which is to clear on mount_options bitmask
913 	 * when this value is found, 0 is no bits are to be changed.
914 	 * This is applied BEFORE setmask
915 	 */
916 	int clrmask;
917 } opt_desc_t;
918 
919 /* possible values for -o data= */
920 static const arg_desc_t logging_mode[] = {
921 	{"ordered", 1 << REISERFS_DATA_ORDERED,
922 	 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
923 	{"journal", 1 << REISERFS_DATA_LOG,
924 	 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
925 	{"writeback", 1 << REISERFS_DATA_WRITEBACK,
926 	 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
927 	{.value = NULL}
928 };
929 
930 /* possible values for -o barrier= */
931 static const arg_desc_t barrier_mode[] = {
932 	{"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
933 	{"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
934 	{.value = NULL}
935 };
936 
937 /*
938  * possible values for "-o block-allocator=" and bits which are to be set in
939  * s_mount_opt of reiserfs specific part of in-core super block
940  */
941 static const arg_desc_t balloc[] = {
942 	{"noborder", 1 << REISERFS_NO_BORDER, 0},
943 	{"border", 0, 1 << REISERFS_NO_BORDER},
944 	{"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
945 	{"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
946 	{"test4", 1 << REISERFS_TEST4, 0},
947 	{"notest4", 0, 1 << REISERFS_TEST4},
948 	{NULL, 0, 0}
949 };
950 
951 static const arg_desc_t tails[] = {
952 	{"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
953 	{"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
954 	{"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
955 	{NULL, 0, 0}
956 };
957 
958 static const arg_desc_t error_actions[] = {
959 	{"panic", 1 << REISERFS_ERROR_PANIC,
960 	 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
961 	{"ro-remount", 1 << REISERFS_ERROR_RO,
962 	 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
963 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
964 	{"continue", 1 << REISERFS_ERROR_CONTINUE,
965 	 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
966 #endif
967 	{NULL, 0, 0},
968 };
969 
970 /*
971  * proceed only one option from a list *cur - string containing of mount
972  * options
973  * opts - array of options which are accepted
974  * opt_arg - if option is found and requires an argument and if it is specifed
975  * in the input - pointer to the argument is stored here
976  * bit_flags - if option requires to set a certain bit - it is set here
977  * return -1 if unknown option is found, opt->arg_required otherwise
978  */
reiserfs_getopt(struct super_block * s,char ** cur,opt_desc_t * opts,char ** opt_arg,unsigned long * bit_flags)979 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
980 			   char **opt_arg, unsigned long *bit_flags)
981 {
982 	char *p;
983 	/*
984 	 * foo=bar,
985 	 * ^   ^  ^
986 	 * |   |  +-- option_end
987 	 * |   +-- arg_start
988 	 * +-- option_start
989 	 */
990 	const opt_desc_t *opt;
991 	const arg_desc_t *arg;
992 
993 	p = *cur;
994 
995 	/* assume argument cannot contain commas */
996 	*cur = strchr(p, ',');
997 	if (*cur) {
998 		*(*cur) = '\0';
999 		(*cur)++;
1000 	}
1001 
1002 	if (!strncmp(p, "alloc=", 6)) {
1003 		/*
1004 		 * Ugly special case, probably we should redo options
1005 		 * parser so that it can understand several arguments for
1006 		 * some options, also so that it can fill several bitfields
1007 		 * with option values.
1008 		 */
1009 		if (reiserfs_parse_alloc_options(s, p + 6)) {
1010 			return -1;
1011 		} else {
1012 			return 0;
1013 		}
1014 	}
1015 
1016 	/* for every option in the list */
1017 	for (opt = opts; opt->option_name; opt++) {
1018 		if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
1019 			if (bit_flags) {
1020 				if (opt->clrmask ==
1021 				    (1 << REISERFS_UNSUPPORTED_OPT))
1022 					reiserfs_warning(s, "super-6500",
1023 							 "%s not supported.\n",
1024 							 p);
1025 				else
1026 					*bit_flags &= ~opt->clrmask;
1027 				if (opt->setmask ==
1028 				    (1 << REISERFS_UNSUPPORTED_OPT))
1029 					reiserfs_warning(s, "super-6501",
1030 							 "%s not supported.\n",
1031 							 p);
1032 				else
1033 					*bit_flags |= opt->setmask;
1034 			}
1035 			break;
1036 		}
1037 	}
1038 	if (!opt->option_name) {
1039 		reiserfs_warning(s, "super-6502",
1040 				 "unknown mount option \"%s\"", p);
1041 		return -1;
1042 	}
1043 
1044 	p += strlen(opt->option_name);
1045 	switch (*p) {
1046 	case '=':
1047 		if (!opt->arg_required) {
1048 			reiserfs_warning(s, "super-6503",
1049 					 "the option \"%s\" does not "
1050 					 "require an argument\n",
1051 					 opt->option_name);
1052 			return -1;
1053 		}
1054 		break;
1055 
1056 	case 0:
1057 		if (opt->arg_required) {
1058 			reiserfs_warning(s, "super-6504",
1059 					 "the option \"%s\" requires an "
1060 					 "argument\n", opt->option_name);
1061 			return -1;
1062 		}
1063 		break;
1064 	default:
1065 		reiserfs_warning(s, "super-6505",
1066 				 "head of option \"%s\" is only correct\n",
1067 				 opt->option_name);
1068 		return -1;
1069 	}
1070 
1071 	/*
1072 	 * move to the argument, or to next option if argument is not
1073 	 * required
1074 	 */
1075 	p++;
1076 
1077 	if (opt->arg_required
1078 	    && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
1079 	    && !strlen(p)) {
1080 		/* this catches "option=," if not allowed */
1081 		reiserfs_warning(s, "super-6506",
1082 				 "empty argument for \"%s\"\n",
1083 				 opt->option_name);
1084 		return -1;
1085 	}
1086 
1087 	if (!opt->values) {
1088 		/* *=NULLopt_arg contains pointer to argument */
1089 		*opt_arg = p;
1090 		return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
1091 	}
1092 
1093 	/* values possible for this option are listed in opt->values */
1094 	for (arg = opt->values; arg->value; arg++) {
1095 		if (!strcmp(p, arg->value)) {
1096 			if (bit_flags) {
1097 				*bit_flags &= ~arg->clrmask;
1098 				*bit_flags |= arg->setmask;
1099 			}
1100 			return opt->arg_required;
1101 		}
1102 	}
1103 
1104 	reiserfs_warning(s, "super-6506",
1105 			 "bad value \"%s\" for option \"%s\"\n", p,
1106 			 opt->option_name);
1107 	return -1;
1108 }
1109 
1110 /* returns 0 if something is wrong in option string, 1 - otherwise */
reiserfs_parse_options(struct super_block * s,char * options,unsigned long * mount_options,unsigned long * blocks,char ** jdev_name,unsigned int * commit_max_age,char ** qf_names,unsigned int * qfmt)1111 static int reiserfs_parse_options(struct super_block *s,
1112 
1113 				  /* string given via mount's -o */
1114 				  char *options,
1115 
1116 				  /*
1117 				   * after the parsing phase, contains the
1118 				   * collection of bitflags defining what
1119 				   * mount options were selected.
1120 				   */
1121 				  unsigned long *mount_options,
1122 
1123 				  /* strtol-ed from NNN of resize=NNN */
1124 				  unsigned long *blocks,
1125 				  char **jdev_name,
1126 				  unsigned int *commit_max_age,
1127 				  char **qf_names,
1128 				  unsigned int *qfmt)
1129 {
1130 	int c;
1131 	char *arg = NULL;
1132 	char *pos;
1133 	opt_desc_t opts[] = {
1134 		/*
1135 		 * Compatibility stuff, so that -o notail for old
1136 		 * setups still work
1137 		 */
1138 		{"tails",.arg_required = 't',.values = tails},
1139 		{"notail",.clrmask =
1140 		 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1141 		{"conv",.setmask = 1 << REISERFS_CONVERT},
1142 		{"attrs",.setmask = 1 << REISERFS_ATTRS},
1143 		{"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1144 		{"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1145 #ifdef CONFIG_REISERFS_FS_XATTR
1146 		{"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1147 		{"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1148 #else
1149 		{"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1150 		{"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1151 #endif
1152 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
1153 		{"acl",.setmask = 1 << REISERFS_POSIXACL},
1154 		{"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1155 #else
1156 		{"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1157 		{"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1158 #endif
1159 		{.option_name = "nolog"},
1160 		{"replayonly",.setmask = 1 << REPLAYONLY},
1161 		{"block-allocator",.arg_required = 'a',.values = balloc},
1162 		{"data",.arg_required = 'd',.values = logging_mode},
1163 		{"barrier",.arg_required = 'b',.values = barrier_mode},
1164 		{"resize",.arg_required = 'r',.values = NULL},
1165 		{"jdev",.arg_required = 'j',.values = NULL},
1166 		{"nolargeio",.arg_required = 'w',.values = NULL},
1167 		{"commit",.arg_required = 'c',.values = NULL},
1168 		{"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1169 		{"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1170 		{"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1171 		{"errors",.arg_required = 'e',.values = error_actions},
1172 		{"usrjquota",.arg_required =
1173 		 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1174 		{"grpjquota",.arg_required =
1175 		 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1176 		{"jqfmt",.arg_required = 'f',.values = NULL},
1177 		{.option_name = NULL}
1178 	};
1179 
1180 	*blocks = 0;
1181 	if (!options || !*options)
1182 		/*
1183 		 * use default configuration: create tails, journaling on, no
1184 		 * conversion to newest format
1185 		 */
1186 		return 1;
1187 
1188 	for (pos = options; pos;) {
1189 		c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1190 		if (c == -1)
1191 			/* wrong option is given */
1192 			return 0;
1193 
1194 		if (c == 'r') {
1195 			char *p;
1196 
1197 			p = NULL;
1198 			/* "resize=NNN" or "resize=auto" */
1199 
1200 			if (!strcmp(arg, "auto")) {
1201 				/* From JFS code, to auto-get the size. */
1202 				*blocks = sb_bdev_nr_blocks(s);
1203 			} else {
1204 				*blocks = simple_strtoul(arg, &p, 0);
1205 				if (*p != '\0') {
1206 					/* NNN does not look like a number */
1207 					reiserfs_warning(s, "super-6507",
1208 							 "bad value %s for "
1209 							 "-oresize\n", arg);
1210 					return 0;
1211 				}
1212 			}
1213 		}
1214 
1215 		if (c == 'c') {
1216 			char *p = NULL;
1217 			unsigned long val = simple_strtoul(arg, &p, 0);
1218 			/* commit=NNN (time in seconds) */
1219 			if (*p != '\0' || val >= (unsigned int)-1) {
1220 				reiserfs_warning(s, "super-6508",
1221 						 "bad value %s for -ocommit\n",
1222 						 arg);
1223 				return 0;
1224 			}
1225 			*commit_max_age = (unsigned int)val;
1226 		}
1227 
1228 		if (c == 'w') {
1229 			reiserfs_warning(s, "super-6509", "nolargeio option "
1230 					 "is no longer supported");
1231 			return 0;
1232 		}
1233 
1234 		if (c == 'j') {
1235 			if (arg && *arg && jdev_name) {
1236 				/* Hm, already assigned? */
1237 				if (*jdev_name) {
1238 					reiserfs_warning(s, "super-6510",
1239 							 "journal device was "
1240 							 "already specified to "
1241 							 "be %s", *jdev_name);
1242 					return 0;
1243 				}
1244 				*jdev_name = arg;
1245 			}
1246 		}
1247 #ifdef CONFIG_QUOTA
1248 		if (c == 'u' || c == 'g') {
1249 			int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1250 
1251 			if (sb_any_quota_loaded(s) &&
1252 			    (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1253 				reiserfs_warning(s, "super-6511",
1254 						 "cannot change journaled "
1255 						 "quota options when quota "
1256 						 "turned on.");
1257 				return 0;
1258 			}
1259 			if (qf_names[qtype] !=
1260 			    REISERFS_SB(s)->s_qf_names[qtype])
1261 				kfree(qf_names[qtype]);
1262 			qf_names[qtype] = NULL;
1263 			if (*arg) {	/* Some filename specified? */
1264 				if (REISERFS_SB(s)->s_qf_names[qtype]
1265 				    && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1266 					      arg)) {
1267 					reiserfs_warning(s, "super-6512",
1268 							 "%s quota file "
1269 							 "already specified.",
1270 							 QTYPE2NAME(qtype));
1271 					return 0;
1272 				}
1273 				if (strchr(arg, '/')) {
1274 					reiserfs_warning(s, "super-6513",
1275 							 "quotafile must be "
1276 							 "on filesystem root.");
1277 					return 0;
1278 				}
1279 				qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
1280 				if (!qf_names[qtype]) {
1281 					reiserfs_warning(s, "reiserfs-2502",
1282 							 "not enough memory "
1283 							 "for storing "
1284 							 "quotafile name.");
1285 					return 0;
1286 				}
1287 				if (qtype == USRQUOTA)
1288 					*mount_options |= 1 << REISERFS_USRQUOTA;
1289 				else
1290 					*mount_options |= 1 << REISERFS_GRPQUOTA;
1291 			} else {
1292 				if (qtype == USRQUOTA)
1293 					*mount_options &= ~(1 << REISERFS_USRQUOTA);
1294 				else
1295 					*mount_options &= ~(1 << REISERFS_GRPQUOTA);
1296 			}
1297 		}
1298 		if (c == 'f') {
1299 			if (!strcmp(arg, "vfsold"))
1300 				*qfmt = QFMT_VFS_OLD;
1301 			else if (!strcmp(arg, "vfsv0"))
1302 				*qfmt = QFMT_VFS_V0;
1303 			else {
1304 				reiserfs_warning(s, "super-6514",
1305 						 "unknown quota format "
1306 						 "specified.");
1307 				return 0;
1308 			}
1309 			if (sb_any_quota_loaded(s) &&
1310 			    *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1311 				reiserfs_warning(s, "super-6515",
1312 						 "cannot change journaled "
1313 						 "quota options when quota "
1314 						 "turned on.");
1315 				return 0;
1316 			}
1317 		}
1318 #else
1319 		if (c == 'u' || c == 'g' || c == 'f') {
1320 			reiserfs_warning(s, "reiserfs-2503", "journaled "
1321 					 "quota options not supported.");
1322 			return 0;
1323 		}
1324 #endif
1325 	}
1326 
1327 #ifdef CONFIG_QUOTA
1328 	if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1329 	    && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1330 		reiserfs_warning(s, "super-6515",
1331 				 "journaled quota format not specified.");
1332 		return 0;
1333 	}
1334 	if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1335 	       sb_has_quota_loaded(s, USRQUOTA)) ||
1336 	    (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1337 	       sb_has_quota_loaded(s, GRPQUOTA))) {
1338 		reiserfs_warning(s, "super-6516", "quota options must "
1339 				 "be present when quota is turned on.");
1340 		return 0;
1341 	}
1342 #endif
1343 
1344 	return 1;
1345 }
1346 
switch_data_mode(struct super_block * s,unsigned long mode)1347 static void switch_data_mode(struct super_block *s, unsigned long mode)
1348 {
1349 	REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1350 					 (1 << REISERFS_DATA_ORDERED) |
1351 					 (1 << REISERFS_DATA_WRITEBACK));
1352 	REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1353 }
1354 
handle_data_mode(struct super_block * s,unsigned long mount_options)1355 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1356 {
1357 	if (mount_options & (1 << REISERFS_DATA_LOG)) {
1358 		if (!reiserfs_data_log(s)) {
1359 			switch_data_mode(s, REISERFS_DATA_LOG);
1360 			reiserfs_info(s, "switching to journaled data mode\n");
1361 		}
1362 	} else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1363 		if (!reiserfs_data_ordered(s)) {
1364 			switch_data_mode(s, REISERFS_DATA_ORDERED);
1365 			reiserfs_info(s, "switching to ordered data mode\n");
1366 		}
1367 	} else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1368 		if (!reiserfs_data_writeback(s)) {
1369 			switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1370 			reiserfs_info(s, "switching to writeback data mode\n");
1371 		}
1372 	}
1373 }
1374 
handle_barrier_mode(struct super_block * s,unsigned long bits)1375 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1376 {
1377 	int flush = (1 << REISERFS_BARRIER_FLUSH);
1378 	int none = (1 << REISERFS_BARRIER_NONE);
1379 	int all_barrier = flush | none;
1380 
1381 	if (bits & all_barrier) {
1382 		REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1383 		if (bits & flush) {
1384 			REISERFS_SB(s)->s_mount_opt |= flush;
1385 			printk("reiserfs: enabling write barrier flush mode\n");
1386 		} else if (bits & none) {
1387 			REISERFS_SB(s)->s_mount_opt |= none;
1388 			printk("reiserfs: write barriers turned off\n");
1389 		}
1390 	}
1391 }
1392 
handle_attrs(struct super_block * s)1393 static void handle_attrs(struct super_block *s)
1394 {
1395 	struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1396 
1397 	if (reiserfs_attrs(s)) {
1398 		if (old_format_only(s)) {
1399 			reiserfs_warning(s, "super-6517", "cannot support "
1400 					 "attributes on 3.5.x disk format");
1401 			REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1402 			return;
1403 		}
1404 		if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1405 			reiserfs_warning(s, "super-6518", "cannot support "
1406 					 "attributes until flag is set in "
1407 					 "super-block");
1408 			REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1409 		}
1410 	}
1411 }
1412 
1413 #ifdef CONFIG_QUOTA
handle_quota_files(struct super_block * s,char ** qf_names,unsigned int * qfmt)1414 static void handle_quota_files(struct super_block *s, char **qf_names,
1415 			       unsigned int *qfmt)
1416 {
1417 	int i;
1418 
1419 	for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
1420 		if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1421 			kfree(REISERFS_SB(s)->s_qf_names[i]);
1422 		REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1423 	}
1424 	if (*qfmt)
1425 		REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1426 }
1427 #endif
1428 
reiserfs_remount(struct super_block * s,int * mount_flags,char * arg)1429 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1430 {
1431 	struct reiserfs_super_block *rs;
1432 	struct reiserfs_transaction_handle th;
1433 	unsigned long blocks;
1434 	unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1435 	unsigned long safe_mask = 0;
1436 	unsigned int commit_max_age = (unsigned int)-1;
1437 	struct reiserfs_journal *journal = SB_JOURNAL(s);
1438 	int err;
1439 	char *qf_names[REISERFS_MAXQUOTAS];
1440 	unsigned int qfmt = 0;
1441 #ifdef CONFIG_QUOTA
1442 	int i;
1443 #endif
1444 
1445 	sync_filesystem(s);
1446 	reiserfs_write_lock(s);
1447 
1448 #ifdef CONFIG_QUOTA
1449 	memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1450 #endif
1451 
1452 	rs = SB_DISK_SUPER_BLOCK(s);
1453 
1454 	if (!reiserfs_parse_options
1455 	    (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1456 	    qf_names, &qfmt)) {
1457 #ifdef CONFIG_QUOTA
1458 		for (i = 0; i < REISERFS_MAXQUOTAS; i++)
1459 			if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1460 				kfree(qf_names[i]);
1461 #endif
1462 		err = -EINVAL;
1463 		goto out_err_unlock;
1464 	}
1465 #ifdef CONFIG_QUOTA
1466 	handle_quota_files(s, qf_names, &qfmt);
1467 #endif
1468 
1469 	handle_attrs(s);
1470 
1471 	/* Add options that are safe here */
1472 	safe_mask |= 1 << REISERFS_SMALLTAIL;
1473 	safe_mask |= 1 << REISERFS_LARGETAIL;
1474 	safe_mask |= 1 << REISERFS_NO_BORDER;
1475 	safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1476 	safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1477 	safe_mask |= 1 << REISERFS_TEST4;
1478 	safe_mask |= 1 << REISERFS_ATTRS;
1479 	safe_mask |= 1 << REISERFS_XATTRS_USER;
1480 	safe_mask |= 1 << REISERFS_POSIXACL;
1481 	safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1482 	safe_mask |= 1 << REISERFS_BARRIER_NONE;
1483 	safe_mask |= 1 << REISERFS_ERROR_RO;
1484 	safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1485 	safe_mask |= 1 << REISERFS_ERROR_PANIC;
1486 	safe_mask |= 1 << REISERFS_USRQUOTA;
1487 	safe_mask |= 1 << REISERFS_GRPQUOTA;
1488 
1489 	/*
1490 	 * Update the bitmask, taking care to keep
1491 	 * the bits we're not allowed to change here
1492 	 */
1493 	REISERFS_SB(s)->s_mount_opt =
1494 	    (REISERFS_SB(s)->
1495 	     s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1496 
1497 	if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1498 		journal->j_max_commit_age = commit_max_age;
1499 		journal->j_max_trans_age = commit_max_age;
1500 	} else if (commit_max_age == 0) {
1501 		/* 0 means restore defaults. */
1502 		journal->j_max_commit_age = journal->j_default_max_commit_age;
1503 		journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1504 	}
1505 
1506 	if (blocks) {
1507 		err = reiserfs_resize(s, blocks);
1508 		if (err != 0)
1509 			goto out_err_unlock;
1510 	}
1511 
1512 	if (*mount_flags & SB_RDONLY) {
1513 		reiserfs_write_unlock(s);
1514 		reiserfs_xattr_init(s, *mount_flags);
1515 		/* remount read-only */
1516 		if (sb_rdonly(s))
1517 			/* it is read-only already */
1518 			goto out_ok_unlocked;
1519 
1520 		err = dquot_suspend(s, -1);
1521 		if (err < 0)
1522 			goto out_err;
1523 
1524 		/* try to remount file system with read-only permissions */
1525 		if (sb_umount_state(rs) == REISERFS_VALID_FS
1526 		    || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1527 			goto out_ok_unlocked;
1528 		}
1529 
1530 		reiserfs_write_lock(s);
1531 
1532 		err = journal_begin(&th, s, 10);
1533 		if (err)
1534 			goto out_err_unlock;
1535 
1536 		/* Mounting a rw partition read-only. */
1537 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1538 		set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1539 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1540 	} else {
1541 		/* remount read-write */
1542 		if (!sb_rdonly(s)) {
1543 			reiserfs_write_unlock(s);
1544 			reiserfs_xattr_init(s, *mount_flags);
1545 			goto out_ok_unlocked;	/* We are read-write already */
1546 		}
1547 
1548 		if (reiserfs_is_journal_aborted(journal)) {
1549 			err = journal->j_errno;
1550 			goto out_err_unlock;
1551 		}
1552 
1553 		handle_data_mode(s, mount_options);
1554 		handle_barrier_mode(s, mount_options);
1555 		REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1556 
1557 		/* now it is safe to call journal_begin */
1558 		s->s_flags &= ~SB_RDONLY;
1559 		err = journal_begin(&th, s, 10);
1560 		if (err)
1561 			goto out_err_unlock;
1562 
1563 		/* Mount a partition which is read-only, read-write */
1564 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1565 		REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1566 		s->s_flags &= ~SB_RDONLY;
1567 		set_sb_umount_state(rs, REISERFS_ERROR_FS);
1568 		if (!old_format_only(s))
1569 			set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1570 		/* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1571 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
1572 		REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1573 	}
1574 	/* this will force a full flush of all journal lists */
1575 	SB_JOURNAL(s)->j_must_wait = 1;
1576 	err = journal_end(&th);
1577 	if (err)
1578 		goto out_err_unlock;
1579 
1580 	reiserfs_write_unlock(s);
1581 	if (!(*mount_flags & SB_RDONLY)) {
1582 		dquot_resume(s, -1);
1583 		reiserfs_write_lock(s);
1584 		finish_unfinished(s);
1585 		reiserfs_write_unlock(s);
1586 		reiserfs_xattr_init(s, *mount_flags);
1587 	}
1588 
1589 out_ok_unlocked:
1590 	return 0;
1591 
1592 out_err_unlock:
1593 	reiserfs_write_unlock(s);
1594 out_err:
1595 	return err;
1596 }
1597 
read_super_block(struct super_block * s,int offset)1598 static int read_super_block(struct super_block *s, int offset)
1599 {
1600 	struct buffer_head *bh;
1601 	struct reiserfs_super_block *rs;
1602 	int fs_blocksize;
1603 
1604 	bh = sb_bread(s, offset / s->s_blocksize);
1605 	if (!bh) {
1606 		reiserfs_warning(s, "sh-2006",
1607 				 "bread failed (dev %s, block %lu, size %lu)",
1608 				 s->s_id, offset / s->s_blocksize,
1609 				 s->s_blocksize);
1610 		return 1;
1611 	}
1612 
1613 	rs = (struct reiserfs_super_block *)bh->b_data;
1614 	if (!is_any_reiserfs_magic_string(rs)) {
1615 		brelse(bh);
1616 		return 1;
1617 	}
1618 	/*
1619 	 * ok, reiserfs signature (old or new) found in at the given offset
1620 	 */
1621 	fs_blocksize = sb_blocksize(rs);
1622 	brelse(bh);
1623 	sb_set_blocksize(s, fs_blocksize);
1624 
1625 	bh = sb_bread(s, offset / s->s_blocksize);
1626 	if (!bh) {
1627 		reiserfs_warning(s, "sh-2007",
1628 				 "bread failed (dev %s, block %lu, size %lu)",
1629 				 s->s_id, offset / s->s_blocksize,
1630 				 s->s_blocksize);
1631 		return 1;
1632 	}
1633 
1634 	rs = (struct reiserfs_super_block *)bh->b_data;
1635 	if (sb_blocksize(rs) != s->s_blocksize) {
1636 		reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1637 				 "filesystem on (dev %s, block %llu, size %lu)",
1638 				 s->s_id,
1639 				 (unsigned long long)bh->b_blocknr,
1640 				 s->s_blocksize);
1641 		brelse(bh);
1642 		return 1;
1643 	}
1644 
1645 	if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1646 		brelse(bh);
1647 		reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1648 				 "--rebuild-tree run detected. Please run\n"
1649 				 "reiserfsck --rebuild-tree and wait for a "
1650 				 "completion. If that fails\n"
1651 				 "get newer reiserfsprogs package");
1652 		return 1;
1653 	}
1654 
1655 	reiserfs_warning(NULL, "", "reiserfs filesystem is deprecated and "
1656 		"scheduled to be removed from the kernel in 2025");
1657 	SB_BUFFER_WITH_SB(s) = bh;
1658 	SB_DISK_SUPER_BLOCK(s) = rs;
1659 
1660 	/*
1661 	 * magic is of non-standard journal filesystem, look at s_version to
1662 	 * find which format is in use
1663 	 */
1664 	if (is_reiserfs_jr(rs)) {
1665 		if (sb_version(rs) == REISERFS_VERSION_2)
1666 			reiserfs_info(s, "found reiserfs format \"3.6\""
1667 				      " with non-standard journal\n");
1668 		else if (sb_version(rs) == REISERFS_VERSION_1)
1669 			reiserfs_info(s, "found reiserfs format \"3.5\""
1670 				      " with non-standard journal\n");
1671 		else {
1672 			reiserfs_warning(s, "sh-2012", "found unknown "
1673 					 "format \"%u\" of reiserfs with "
1674 					 "non-standard magic", sb_version(rs));
1675 			return 1;
1676 		}
1677 	} else
1678 		/*
1679 		 * s_version of standard format may contain incorrect
1680 		 * information, so we just look at the magic string
1681 		 */
1682 		reiserfs_info(s,
1683 			      "found reiserfs format \"%s\" with standard journal\n",
1684 			      is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1685 
1686 	s->s_op = &reiserfs_sops;
1687 	s->s_export_op = &reiserfs_export_ops;
1688 #ifdef CONFIG_QUOTA
1689 	s->s_qcop = &reiserfs_qctl_operations;
1690 	s->dq_op = &reiserfs_quota_operations;
1691 	s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1692 #endif
1693 
1694 	/*
1695 	 * new format is limited by the 32 bit wide i_blocks field, want to
1696 	 * be one full block below that.
1697 	 */
1698 	s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1699 	return 0;
1700 }
1701 
1702 /* after journal replay, reread all bitmap and super blocks */
reread_meta_blocks(struct super_block * s)1703 static int reread_meta_blocks(struct super_block *s)
1704 {
1705 	if (bh_read(SB_BUFFER_WITH_SB(s), 0) < 0) {
1706 		reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1707 		return 1;
1708 	}
1709 
1710 	return 0;
1711 }
1712 
1713 /* hash detection stuff */
1714 
1715 /*
1716  * if root directory is empty - we set default - Yura's - hash and
1717  * warn about it
1718  * FIXME: we look for only one name in a directory. If tea and yura
1719  * both have the same value - we ask user to send report to the
1720  * mailing list
1721  */
find_hash_out(struct super_block * s)1722 static __u32 find_hash_out(struct super_block *s)
1723 {
1724 	int retval;
1725 	struct inode *inode;
1726 	struct cpu_key key;
1727 	INITIALIZE_PATH(path);
1728 	struct reiserfs_dir_entry de;
1729 	struct reiserfs_de_head *deh;
1730 	__u32 hash = DEFAULT_HASH;
1731 	__u32 deh_hashval, teahash, r5hash, yurahash;
1732 
1733 	inode = d_inode(s->s_root);
1734 
1735 	make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1736 	retval = search_by_entry_key(s, &key, &path, &de);
1737 	if (retval == IO_ERROR) {
1738 		pathrelse(&path);
1739 		return UNSET_HASH;
1740 	}
1741 	if (retval == NAME_NOT_FOUND)
1742 		de.de_entry_num--;
1743 
1744 	set_de_name_and_namelen(&de);
1745 	deh = de.de_deh + de.de_entry_num;
1746 
1747 	if (deh_offset(deh) == DOT_DOT_OFFSET) {
1748 		/* allow override in this case */
1749 		if (reiserfs_rupasov_hash(s))
1750 			hash = YURA_HASH;
1751 		reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
1752 		goto out;
1753 	}
1754 
1755 	deh_hashval = GET_HASH_VALUE(deh_offset(deh));
1756 	r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1757 	teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1758 	yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1759 
1760 	if ((teahash == r5hash && deh_hashval == r5hash) ||
1761 	    (teahash == yurahash && deh_hashval == yurahash) ||
1762 	    (r5hash == yurahash && deh_hashval == yurahash)) {
1763 		reiserfs_warning(s, "reiserfs-2506",
1764 				 "Unable to automatically detect hash "
1765 				 "function. Please mount with -o "
1766 				 "hash={tea,rupasov,r5}");
1767 		hash = UNSET_HASH;
1768 		goto out;
1769 	}
1770 
1771 	if (deh_hashval == yurahash)
1772 		hash = YURA_HASH;
1773 	else if (deh_hashval == teahash)
1774 		hash = TEA_HASH;
1775 	else if (deh_hashval == r5hash)
1776 		hash = R5_HASH;
1777 	else {
1778 		reiserfs_warning(s, "reiserfs-2506",
1779 				 "Unrecognised hash function");
1780 		hash = UNSET_HASH;
1781 	}
1782 out:
1783 	pathrelse(&path);
1784 	return hash;
1785 }
1786 
1787 /* finds out which hash names are sorted with */
what_hash(struct super_block * s)1788 static int what_hash(struct super_block *s)
1789 {
1790 	__u32 code;
1791 
1792 	code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1793 
1794 	/*
1795 	 * reiserfs_hash_detect() == true if any of the hash mount options
1796 	 * were used.  We must check them to make sure the user isn't
1797 	 * using a bad hash value
1798 	 */
1799 	if (code == UNSET_HASH || reiserfs_hash_detect(s))
1800 		code = find_hash_out(s);
1801 
1802 	if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1803 		/*
1804 		 * detection has found the hash, and we must check against the
1805 		 * mount options
1806 		 */
1807 		if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1808 			reiserfs_warning(s, "reiserfs-2507",
1809 					 "Error, %s hash detected, "
1810 					 "unable to force rupasov hash",
1811 					 reiserfs_hashname(code));
1812 			code = UNSET_HASH;
1813 		} else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1814 			reiserfs_warning(s, "reiserfs-2508",
1815 					 "Error, %s hash detected, "
1816 					 "unable to force tea hash",
1817 					 reiserfs_hashname(code));
1818 			code = UNSET_HASH;
1819 		} else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1820 			reiserfs_warning(s, "reiserfs-2509",
1821 					 "Error, %s hash detected, "
1822 					 "unable to force r5 hash",
1823 					 reiserfs_hashname(code));
1824 			code = UNSET_HASH;
1825 		}
1826 	} else {
1827 		/*
1828 		 * find_hash_out was not called or
1829 		 * could not determine the hash
1830 		 */
1831 		if (reiserfs_rupasov_hash(s)) {
1832 			code = YURA_HASH;
1833 		} else if (reiserfs_tea_hash(s)) {
1834 			code = TEA_HASH;
1835 		} else if (reiserfs_r5_hash(s)) {
1836 			code = R5_HASH;
1837 		}
1838 	}
1839 
1840 	/*
1841 	 * if we are mounted RW, and we have a new valid hash code, update
1842 	 * the super
1843 	 */
1844 	if (code != UNSET_HASH &&
1845 	    !sb_rdonly(s) &&
1846 	    code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1847 		set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1848 	}
1849 	return code;
1850 }
1851 
1852 /* return pointer to appropriate function */
hash_function(struct super_block * s)1853 static hashf_t hash_function(struct super_block *s)
1854 {
1855 	switch (what_hash(s)) {
1856 	case TEA_HASH:
1857 		reiserfs_info(s, "Using tea hash to sort names\n");
1858 		return keyed_hash;
1859 	case YURA_HASH:
1860 		reiserfs_info(s, "Using rupasov hash to sort names\n");
1861 		return yura_hash;
1862 	case R5_HASH:
1863 		reiserfs_info(s, "Using r5 hash to sort names\n");
1864 		return r5_hash;
1865 	}
1866 	return NULL;
1867 }
1868 
1869 /* this is used to set up correct value for old partitions */
function2code(hashf_t func)1870 static int function2code(hashf_t func)
1871 {
1872 	if (func == keyed_hash)
1873 		return TEA_HASH;
1874 	if (func == yura_hash)
1875 		return YURA_HASH;
1876 	if (func == r5_hash)
1877 		return R5_HASH;
1878 
1879 	BUG();			/* should never happen */
1880 
1881 	return 0;
1882 }
1883 
1884 #define SWARN(silent, s, id, ...)			\
1885 	if (!(silent))				\
1886 		reiserfs_warning(s, id, __VA_ARGS__)
1887 
reiserfs_fill_super(struct super_block * s,void * data,int silent)1888 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1889 {
1890 	struct inode *root_inode;
1891 	struct reiserfs_transaction_handle th;
1892 	int old_format = 0;
1893 	unsigned long blocks;
1894 	unsigned int commit_max_age = 0;
1895 	int jinit_done = 0;
1896 	struct reiserfs_iget_args args;
1897 	struct reiserfs_super_block *rs;
1898 	char *jdev_name;
1899 	struct reiserfs_sb_info *sbi;
1900 	int errval = -EINVAL;
1901 	char *qf_names[REISERFS_MAXQUOTAS] = {};
1902 	unsigned int qfmt = 0;
1903 
1904 	sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1905 	if (!sbi)
1906 		return -ENOMEM;
1907 	s->s_fs_info = sbi;
1908 	/* Set default values for options: non-aggressive tails, RO on errors */
1909 	sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1910 	sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1911 	sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1912 	/* no preallocation minimum, be smart in reiserfs_file_write instead */
1913 	sbi->s_alloc_options.preallocmin = 0;
1914 	/* Preallocate by 16 blocks (17-1) at once */
1915 	sbi->s_alloc_options.preallocsize = 17;
1916 	/* setup default block allocator options */
1917 	reiserfs_init_alloc_options(s);
1918 
1919 	spin_lock_init(&sbi->old_work_lock);
1920 	INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1921 	mutex_init(&sbi->lock);
1922 	sbi->lock_depth = -1;
1923 
1924 	sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
1925 					 s->s_id);
1926 	if (!sbi->commit_wq) {
1927 		SWARN(silent, s, "", "Cannot allocate commit workqueue");
1928 		errval = -ENOMEM;
1929 		goto error_unlocked;
1930 	}
1931 
1932 	jdev_name = NULL;
1933 	if (reiserfs_parse_options
1934 	    (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
1935 	     &commit_max_age, qf_names, &qfmt) == 0) {
1936 		goto error_unlocked;
1937 	}
1938 	if (jdev_name && jdev_name[0]) {
1939 		sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1940 		if (!sbi->s_jdev) {
1941 			SWARN(silent, s, "", "Cannot allocate memory for "
1942 				"journal device name");
1943 			goto error_unlocked;
1944 		}
1945 	}
1946 #ifdef CONFIG_QUOTA
1947 	handle_quota_files(s, qf_names, &qfmt);
1948 #endif
1949 
1950 	if (blocks) {
1951 		SWARN(silent, s, "jmacd-7", "resize option for remount only");
1952 		goto error_unlocked;
1953 	}
1954 
1955 	/*
1956 	 * try old format (undistributed bitmap, super block in 8-th 1k
1957 	 * block of a device)
1958 	 */
1959 	if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1960 		old_format = 1;
1961 
1962 	/*
1963 	 * try new format (64-th 1k block), which can contain reiserfs
1964 	 * super block
1965 	 */
1966 	else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1967 		SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1968 		      s->s_id);
1969 		goto error_unlocked;
1970 	}
1971 
1972 	s->s_time_min = 0;
1973 	s->s_time_max = U32_MAX;
1974 
1975 	rs = SB_DISK_SUPER_BLOCK(s);
1976 	/*
1977 	 * Let's do basic sanity check to verify that underlying device is not
1978 	 * smaller than the filesystem. If the check fails then abort and
1979 	 * scream, because bad stuff will happen otherwise.
1980 	 */
1981 	if (bdev_nr_bytes(s->s_bdev) < sb_block_count(rs) * sb_blocksize(rs)) {
1982 		SWARN(silent, s, "", "Filesystem cannot be "
1983 		      "mounted because it is bigger than the device");
1984 		SWARN(silent, s, "", "You may need to run fsck "
1985 		      "or increase size of your LVM partition");
1986 		SWARN(silent, s, "", "Or may be you forgot to "
1987 		      "reboot after fdisk when it told you to");
1988 		goto error_unlocked;
1989 	}
1990 
1991 	sbi->s_mount_state = SB_REISERFS_STATE(s);
1992 	sbi->s_mount_state = REISERFS_VALID_FS;
1993 
1994 	if ((errval = reiserfs_init_bitmap_cache(s))) {
1995 		SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1996 		goto error_unlocked;
1997 	}
1998 
1999 	errval = -EINVAL;
2000 #ifdef CONFIG_REISERFS_CHECK
2001 	SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
2002 	SWARN(silent, s, "", "- it is slow mode for debugging.");
2003 #endif
2004 
2005 	/* make data=ordered the default */
2006 	if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
2007 	    !reiserfs_data_writeback(s)) {
2008 		sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
2009 	}
2010 
2011 	if (reiserfs_data_log(s)) {
2012 		reiserfs_info(s, "using journaled data mode\n");
2013 	} else if (reiserfs_data_ordered(s)) {
2014 		reiserfs_info(s, "using ordered data mode\n");
2015 	} else {
2016 		reiserfs_info(s, "using writeback data mode\n");
2017 	}
2018 	if (reiserfs_barrier_flush(s)) {
2019 		printk("reiserfs: using flush barriers\n");
2020 	}
2021 
2022 	if (journal_init(s, jdev_name, old_format, commit_max_age)) {
2023 		SWARN(silent, s, "sh-2022",
2024 		      "unable to initialize journal space");
2025 		goto error_unlocked;
2026 	} else {
2027 		/*
2028 		 * once this is set, journal_release must be called
2029 		 * if we error out of the mount
2030 		 */
2031 		jinit_done = 1;
2032 	}
2033 
2034 	if (reread_meta_blocks(s)) {
2035 		SWARN(silent, s, "jmacd-9",
2036 		      "unable to reread meta blocks after journal init");
2037 		goto error_unlocked;
2038 	}
2039 
2040 	if (replay_only(s))
2041 		goto error_unlocked;
2042 
2043 	s->s_xattr = reiserfs_xattr_handlers;
2044 
2045 	if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
2046 		SWARN(silent, s, "clm-7000",
2047 		      "Detected readonly device, marking FS readonly");
2048 		s->s_flags |= SB_RDONLY;
2049 	}
2050 	args.objectid = REISERFS_ROOT_OBJECTID;
2051 	args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
2052 	root_inode =
2053 	    iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
2054 			 reiserfs_init_locked_inode, (void *)&args);
2055 	if (!root_inode) {
2056 		SWARN(silent, s, "jmacd-10", "get root inode failed");
2057 		goto error_unlocked;
2058 	}
2059 
2060 	/*
2061 	 * This path assumed to be called with the BKL in the old times.
2062 	 * Now we have inherited the big reiserfs lock from it and many
2063 	 * reiserfs helpers called in the mount path and elsewhere require
2064 	 * this lock to be held even if it's not always necessary. Let's be
2065 	 * conservative and hold it early. The window can be reduced after
2066 	 * careful review of the code.
2067 	 */
2068 	reiserfs_write_lock(s);
2069 
2070 	if (root_inode->i_state & I_NEW) {
2071 		reiserfs_read_locked_inode(root_inode, &args);
2072 		unlock_new_inode(root_inode);
2073 	}
2074 
2075 	if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
2076 	    !root_inode->i_size) {
2077 		SWARN(silent, s, "", "corrupt root inode, run fsck");
2078 		iput(root_inode);
2079 		errval = -EUCLEAN;
2080 		goto error;
2081 	}
2082 
2083 	s->s_root = d_make_root(root_inode);
2084 	if (!s->s_root)
2085 		goto error;
2086 	/* define and initialize hash function */
2087 	sbi->s_hash_function = hash_function(s);
2088 	if (sbi->s_hash_function == NULL) {
2089 		dput(s->s_root);
2090 		s->s_root = NULL;
2091 		goto error;
2092 	}
2093 
2094 	if (is_reiserfs_3_5(rs)
2095 	    || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
2096 		set_bit(REISERFS_3_5, &sbi->s_properties);
2097 	else if (old_format)
2098 		set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
2099 	else
2100 		set_bit(REISERFS_3_6, &sbi->s_properties);
2101 
2102 	if (!sb_rdonly(s)) {
2103 
2104 		errval = journal_begin(&th, s, 1);
2105 		if (errval) {
2106 			dput(s->s_root);
2107 			s->s_root = NULL;
2108 			goto error;
2109 		}
2110 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
2111 
2112 		set_sb_umount_state(rs, REISERFS_ERROR_FS);
2113 		set_sb_fs_state(rs, 0);
2114 
2115 		/*
2116 		 * Clear out s_bmap_nr if it would wrap. We can handle this
2117 		 * case, but older revisions can't. This will cause the
2118 		 * file system to fail mount on those older implementations,
2119 		 * avoiding corruption. -jeffm
2120 		 */
2121 		if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
2122 		    sb_bmap_nr(rs) != 0) {
2123 			reiserfs_warning(s, "super-2030", "This file system "
2124 					"claims to use %u bitmap blocks in "
2125 					"its super block, but requires %u. "
2126 					"Clearing to zero.", sb_bmap_nr(rs),
2127 					reiserfs_bmap_count(s));
2128 
2129 			set_sb_bmap_nr(rs, 0);
2130 		}
2131 
2132 		if (old_format_only(s)) {
2133 			/*
2134 			 * filesystem of format 3.5 either with standard
2135 			 * or non-standard journal
2136 			 */
2137 			if (convert_reiserfs(s)) {
2138 				/* and -o conv is given */
2139 				if (!silent)
2140 					reiserfs_info(s,
2141 						      "converting 3.5 filesystem to the 3.6 format");
2142 
2143 				if (is_reiserfs_3_5(rs))
2144 					/*
2145 					 * put magic string of 3.6 format.
2146 					 * 2.2 will not be able to
2147 					 * mount this filesystem anymore
2148 					 */
2149 					memcpy(rs->s_v1.s_magic,
2150 					       reiserfs_3_6_magic_string,
2151 					       sizeof
2152 					       (reiserfs_3_6_magic_string));
2153 
2154 				set_sb_version(rs, REISERFS_VERSION_2);
2155 				reiserfs_convert_objectid_map_v1(s);
2156 				set_bit(REISERFS_3_6, &sbi->s_properties);
2157 				clear_bit(REISERFS_3_5, &sbi->s_properties);
2158 			} else if (!silent) {
2159 				reiserfs_info(s, "using 3.5.x disk format\n");
2160 			}
2161 		} else
2162 			set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2163 
2164 
2165 		journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
2166 		errval = journal_end(&th);
2167 		if (errval) {
2168 			dput(s->s_root);
2169 			s->s_root = NULL;
2170 			goto error;
2171 		}
2172 
2173 		reiserfs_write_unlock(s);
2174 		if ((errval = reiserfs_lookup_privroot(s)) ||
2175 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2176 			dput(s->s_root);
2177 			s->s_root = NULL;
2178 			goto error_unlocked;
2179 		}
2180 		reiserfs_write_lock(s);
2181 
2182 		/*
2183 		 * look for files which were to be removed in previous session
2184 		 */
2185 		finish_unfinished(s);
2186 	} else {
2187 		if (old_format_only(s) && !silent) {
2188 			reiserfs_info(s, "using 3.5.x disk format\n");
2189 		}
2190 
2191 		reiserfs_write_unlock(s);
2192 		if ((errval = reiserfs_lookup_privroot(s)) ||
2193 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2194 			dput(s->s_root);
2195 			s->s_root = NULL;
2196 			goto error_unlocked;
2197 		}
2198 		reiserfs_write_lock(s);
2199 	}
2200 	/*
2201 	 * mark hash in super block: it could be unset. overwrite should be ok
2202 	 */
2203 	set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2204 
2205 	handle_attrs(s);
2206 
2207 	reiserfs_proc_info_init(s);
2208 
2209 	init_waitqueue_head(&(sbi->s_wait));
2210 	spin_lock_init(&sbi->bitmap_lock);
2211 
2212 	reiserfs_write_unlock(s);
2213 
2214 	return (0);
2215 
2216 error:
2217 	reiserfs_write_unlock(s);
2218 
2219 error_unlocked:
2220 	/* kill the commit thread, free journal ram */
2221 	if (jinit_done) {
2222 		reiserfs_write_lock(s);
2223 		journal_release_error(NULL, s);
2224 		reiserfs_write_unlock(s);
2225 	}
2226 
2227 	if (sbi->commit_wq)
2228 		destroy_workqueue(sbi->commit_wq);
2229 
2230 	reiserfs_cancel_old_flush(s);
2231 
2232 	reiserfs_free_bitmap_cache(s);
2233 	if (SB_BUFFER_WITH_SB(s))
2234 		brelse(SB_BUFFER_WITH_SB(s));
2235 #ifdef CONFIG_QUOTA
2236 	{
2237 		int j;
2238 		for (j = 0; j < REISERFS_MAXQUOTAS; j++)
2239 			kfree(qf_names[j]);
2240 	}
2241 #endif
2242 	kfree(sbi->s_jdev);
2243 	kfree(sbi);
2244 
2245 	s->s_fs_info = NULL;
2246 	return errval;
2247 }
2248 
reiserfs_statfs(struct dentry * dentry,struct kstatfs * buf)2249 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2250 {
2251 	struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2252 
2253 	buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2254 	buf->f_bfree = sb_free_blocks(rs);
2255 	buf->f_bavail = buf->f_bfree;
2256 	buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2257 	buf->f_bsize = dentry->d_sb->s_blocksize;
2258 	/* changed to accommodate gcc folks. */
2259 	buf->f_type = REISERFS_SUPER_MAGIC;
2260 	buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2261 	buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2262 				sizeof(rs->s_uuid)/2);
2263 
2264 	return 0;
2265 }
2266 
2267 #ifdef CONFIG_QUOTA
reiserfs_write_dquot(struct dquot * dquot)2268 static int reiserfs_write_dquot(struct dquot *dquot)
2269 {
2270 	struct reiserfs_transaction_handle th;
2271 	int ret, err;
2272 	int depth;
2273 
2274 	reiserfs_write_lock(dquot->dq_sb);
2275 	ret =
2276 	    journal_begin(&th, dquot->dq_sb,
2277 			  REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2278 	if (ret)
2279 		goto out;
2280 	depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2281 	ret = dquot_commit(dquot);
2282 	reiserfs_write_lock_nested(dquot->dq_sb, depth);
2283 	err = journal_end(&th);
2284 	if (!ret && err)
2285 		ret = err;
2286 out:
2287 	reiserfs_write_unlock(dquot->dq_sb);
2288 	return ret;
2289 }
2290 
reiserfs_acquire_dquot(struct dquot * dquot)2291 static int reiserfs_acquire_dquot(struct dquot *dquot)
2292 {
2293 	struct reiserfs_transaction_handle th;
2294 	int ret, err;
2295 	int depth;
2296 
2297 	reiserfs_write_lock(dquot->dq_sb);
2298 	ret =
2299 	    journal_begin(&th, dquot->dq_sb,
2300 			  REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2301 	if (ret)
2302 		goto out;
2303 	depth = reiserfs_write_unlock_nested(dquot->dq_sb);
2304 	ret = dquot_acquire(dquot);
2305 	reiserfs_write_lock_nested(dquot->dq_sb, depth);
2306 	err = journal_end(&th);
2307 	if (!ret && err)
2308 		ret = err;
2309 out:
2310 	reiserfs_write_unlock(dquot->dq_sb);
2311 	return ret;
2312 }
2313 
reiserfs_release_dquot(struct dquot * dquot)2314 static int reiserfs_release_dquot(struct dquot *dquot)
2315 {
2316 	struct reiserfs_transaction_handle th;
2317 	int ret, err;
2318 
2319 	reiserfs_write_lock(dquot->dq_sb);
2320 	ret =
2321 	    journal_begin(&th, dquot->dq_sb,
2322 			  REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2323 	reiserfs_write_unlock(dquot->dq_sb);
2324 	if (ret) {
2325 		/* Release dquot anyway to avoid endless cycle in dqput() */
2326 		dquot_release(dquot);
2327 		goto out;
2328 	}
2329 	ret = dquot_release(dquot);
2330 	reiserfs_write_lock(dquot->dq_sb);
2331 	err = journal_end(&th);
2332 	if (!ret && err)
2333 		ret = err;
2334 	reiserfs_write_unlock(dquot->dq_sb);
2335 out:
2336 	return ret;
2337 }
2338 
reiserfs_mark_dquot_dirty(struct dquot * dquot)2339 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2340 {
2341 	/* Are we journaling quotas? */
2342 	if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2343 	    REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2344 		dquot_mark_dquot_dirty(dquot);
2345 		return reiserfs_write_dquot(dquot);
2346 	} else
2347 		return dquot_mark_dquot_dirty(dquot);
2348 }
2349 
reiserfs_write_info(struct super_block * sb,int type)2350 static int reiserfs_write_info(struct super_block *sb, int type)
2351 {
2352 	struct reiserfs_transaction_handle th;
2353 	int ret, err;
2354 	int depth;
2355 
2356 	/* Data block + inode block */
2357 	reiserfs_write_lock(sb);
2358 	ret = journal_begin(&th, sb, 2);
2359 	if (ret)
2360 		goto out;
2361 	depth = reiserfs_write_unlock_nested(sb);
2362 	ret = dquot_commit_info(sb, type);
2363 	reiserfs_write_lock_nested(sb, depth);
2364 	err = journal_end(&th);
2365 	if (!ret && err)
2366 		ret = err;
2367 out:
2368 	reiserfs_write_unlock(sb);
2369 	return ret;
2370 }
2371 
2372 /*
2373  * Turn on quotas during mount time - we need to find the quota file and such...
2374  */
reiserfs_quota_on_mount(struct super_block * sb,int type)2375 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2376 {
2377 	return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2378 					REISERFS_SB(sb)->s_jquota_fmt, type);
2379 }
2380 
2381 /*
2382  * Standard function to be called on quota_on
2383  */
reiserfs_quota_on(struct super_block * sb,int type,int format_id,const struct path * path)2384 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2385 			     const struct path *path)
2386 {
2387 	int err;
2388 	struct inode *inode;
2389 	struct reiserfs_transaction_handle th;
2390 	int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2391 
2392 	reiserfs_write_lock(sb);
2393 	if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2394 		err = -EINVAL;
2395 		goto out;
2396 	}
2397 
2398 	/* Quotafile not on the same filesystem? */
2399 	if (path->dentry->d_sb != sb) {
2400 		err = -EXDEV;
2401 		goto out;
2402 	}
2403 	inode = d_inode(path->dentry);
2404 	/*
2405 	 * We must not pack tails for quota files on reiserfs for quota
2406 	 * IO to work
2407 	 */
2408 	if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2409 		err = reiserfs_unpack(inode);
2410 		if (err) {
2411 			reiserfs_warning(sb, "super-6520",
2412 				"Unpacking tail of quota file failed"
2413 				" (%d). Cannot turn on quotas.", err);
2414 			err = -EINVAL;
2415 			goto out;
2416 		}
2417 		mark_inode_dirty(inode);
2418 	}
2419 	/* Journaling quota? */
2420 	if (REISERFS_SB(sb)->s_qf_names[type]) {
2421 		/* Quotafile not of fs root? */
2422 		if (path->dentry->d_parent != sb->s_root)
2423 			reiserfs_warning(sb, "super-6521",
2424 				 "Quota file not on filesystem root. "
2425 				 "Journalled quota will not work.");
2426 	}
2427 
2428 	/*
2429 	 * When we journal data on quota file, we have to flush journal to see
2430 	 * all updates to the file when we bypass pagecache...
2431 	 */
2432 	if (reiserfs_file_data_log(inode)) {
2433 		/* Just start temporary transaction and finish it */
2434 		err = journal_begin(&th, sb, 1);
2435 		if (err)
2436 			goto out;
2437 		err = journal_end_sync(&th);
2438 		if (err)
2439 			goto out;
2440 	}
2441 	reiserfs_write_unlock(sb);
2442 	err = dquot_quota_on(sb, type, format_id, path);
2443 	if (!err) {
2444 		inode_lock(inode);
2445 		REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
2446 					      REISERFS_NOATIME_FL;
2447 		inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
2448 				S_IMMUTABLE | S_NOATIME);
2449 		inode_unlock(inode);
2450 		mark_inode_dirty(inode);
2451 	}
2452 	return err;
2453 out:
2454 	reiserfs_write_unlock(sb);
2455 	return err;
2456 }
2457 
reiserfs_quota_off(struct super_block * sb,int type)2458 static int reiserfs_quota_off(struct super_block *sb, int type)
2459 {
2460 	int err;
2461 	struct inode *inode = sb_dqopt(sb)->files[type];
2462 
2463 	if (!inode || !igrab(inode))
2464 		goto out;
2465 
2466 	err = dquot_quota_off(sb, type);
2467 	if (err)
2468 		goto out_put;
2469 
2470 	inode_lock(inode);
2471 	REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
2472 					REISERFS_NOATIME_FL);
2473 	inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
2474 	inode_unlock(inode);
2475 	mark_inode_dirty(inode);
2476 out_put:
2477 	iput(inode);
2478 	return err;
2479 out:
2480 	return dquot_quota_off(sb, type);
2481 }
2482 
2483 /*
2484  * Read data from quotafile - avoid pagecache and such because we cannot afford
2485  * acquiring the locks... As quota files are never truncated and quota code
2486  * itself serializes the operations (and no one else should touch the files)
2487  * we don't have to be afraid of races
2488  */
reiserfs_quota_read(struct super_block * sb,int type,char * data,size_t len,loff_t off)2489 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2490 				   size_t len, loff_t off)
2491 {
2492 	struct inode *inode = sb_dqopt(sb)->files[type];
2493 	unsigned long blk = off >> sb->s_blocksize_bits;
2494 	int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2495 	size_t toread;
2496 	struct buffer_head tmp_bh, *bh;
2497 	loff_t i_size = i_size_read(inode);
2498 
2499 	if (off > i_size)
2500 		return 0;
2501 	if (off + len > i_size)
2502 		len = i_size - off;
2503 	toread = len;
2504 	while (toread > 0) {
2505 		tocopy = min_t(unsigned long, 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  */
reiserfs_quota_write(struct super_block * sb,int type,const char * data,size_t len,loff_t off)2537 static 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 = min_t(unsigned long, sb->s_blocksize - offset, towrite);
2554 		tmp_bh.b_state = 0;
2555 		reiserfs_write_lock(sb);
2556 		err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2557 		reiserfs_write_unlock(sb);
2558 		if (err)
2559 			goto out;
2560 		if (offset || tocopy != sb->s_blocksize)
2561 			bh = sb_bread(sb, tmp_bh.b_blocknr);
2562 		else
2563 			bh = sb_getblk(sb, tmp_bh.b_blocknr);
2564 		if (!bh) {
2565 			err = -EIO;
2566 			goto out;
2567 		}
2568 		lock_buffer(bh);
2569 		memcpy(bh->b_data + offset, data, tocopy);
2570 		flush_dcache_page(bh->b_page);
2571 		set_buffer_uptodate(bh);
2572 		unlock_buffer(bh);
2573 		reiserfs_write_lock(sb);
2574 		reiserfs_prepare_for_journal(sb, bh, 1);
2575 		journal_mark_dirty(current->journal_info, bh);
2576 		if (!journal_quota)
2577 			reiserfs_add_ordered_list(inode, bh);
2578 		reiserfs_write_unlock(sb);
2579 		brelse(bh);
2580 		offset = 0;
2581 		towrite -= tocopy;
2582 		data += tocopy;
2583 		blk++;
2584 	}
2585 out:
2586 	if (len == towrite)
2587 		return err;
2588 	if (inode->i_size < off + len - towrite)
2589 		i_size_write(inode, off + len - towrite);
2590 	inode->i_mtime = inode_set_ctime_current(inode);
2591 	mark_inode_dirty(inode);
2592 	return len - towrite;
2593 }
2594 
2595 #endif
2596 
get_super_block(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)2597 static struct dentry *get_super_block(struct file_system_type *fs_type,
2598 			   int flags, const char *dev_name,
2599 			   void *data)
2600 {
2601 	return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2602 }
2603 
init_reiserfs_fs(void)2604 static int __init init_reiserfs_fs(void)
2605 {
2606 	int ret;
2607 
2608 	ret = init_inodecache();
2609 	if (ret)
2610 		return ret;
2611 
2612 	reiserfs_proc_info_global_init();
2613 
2614 	ret = register_filesystem(&reiserfs_fs_type);
2615 	if (ret)
2616 		goto out;
2617 
2618 	return 0;
2619 out:
2620 	reiserfs_proc_info_global_done();
2621 	destroy_inodecache();
2622 
2623 	return ret;
2624 }
2625 
exit_reiserfs_fs(void)2626 static void __exit exit_reiserfs_fs(void)
2627 {
2628 	reiserfs_proc_info_global_done();
2629 	unregister_filesystem(&reiserfs_fs_type);
2630 	destroy_inodecache();
2631 }
2632 
2633 struct file_system_type reiserfs_fs_type = {
2634 	.owner = THIS_MODULE,
2635 	.name = "reiserfs",
2636 	.mount = get_super_block,
2637 	.kill_sb = reiserfs_kill_sb,
2638 	.fs_flags = FS_REQUIRES_DEV,
2639 };
2640 MODULE_ALIAS_FS("reiserfs");
2641 
2642 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2643 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2644 MODULE_LICENSE("GPL");
2645 
2646 module_init(init_reiserfs_fs);
2647 module_exit(exit_reiserfs_fs);
2648