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