?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: 6132/1: PL330: Add common core driver
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob04bf5d791bdad8b9fea4c6eecc6d7772035d7144
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 dquot_initialize(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 static void reiserfs_clear_inode(struct inode *inode)
582 {
583 dquot_drop(inode);
584 }
585
586 #ifdef CONFIG_QUOTA
587 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
588 size_t, loff_t);
589 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
590 loff_t);
591 #endif
592
593 static const struct super_operations reiserfs_sops = {
594 .alloc_inode = reiserfs_alloc_inode,
595 .destroy_inode = reiserfs_destroy_inode,
596 .write_inode = reiserfs_write_inode,
597 .dirty_inode = reiserfs_dirty_inode,
598 .clear_inode = reiserfs_clear_inode,
599 .delete_inode = reiserfs_delete_inode,
600 .put_super = reiserfs_put_super,
601 .write_super = reiserfs_write_super,
602 .sync_fs = reiserfs_sync_fs,
603 .freeze_fs = reiserfs_freeze,
604 .unfreeze_fs = reiserfs_unfreeze,
605 .statfs = reiserfs_statfs,
606 .remount_fs = reiserfs_remount,
607 .show_options = generic_show_options,
608 #ifdef CONFIG_QUOTA
609 .quota_read = reiserfs_quota_read,
610 .quota_write = reiserfs_quota_write,
611 #endif
612 };
613
614 #ifdef CONFIG_QUOTA
615 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
616
617 static int reiserfs_write_dquot(struct dquot *);
618 static int reiserfs_acquire_dquot(struct dquot *);
619 static int reiserfs_release_dquot(struct dquot *);
620 static int reiserfs_mark_dquot_dirty(struct dquot *);
621 static int reiserfs_write_info(struct super_block *, int);
622 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
623
624 static const struct dquot_operations reiserfs_quota_operations = {
625 .write_dquot = reiserfs_write_dquot,
626 .acquire_dquot = reiserfs_acquire_dquot,
627 .release_dquot = reiserfs_release_dquot,
628 .mark_dirty = reiserfs_mark_dquot_dirty,
629 .write_info = reiserfs_write_info,
630 .alloc_dquot = dquot_alloc,
631 .destroy_dquot = dquot_destroy,
632 };
633
634 static const struct quotactl_ops reiserfs_qctl_operations = {
635 .quota_on = reiserfs_quota_on,
636 .quota_off = vfs_quota_off,
637 .quota_sync = vfs_quota_sync,
638 .get_info = vfs_get_dqinfo,
639 .set_info = vfs_set_dqinfo,
640 .get_dqblk = vfs_get_dqblk,
641 .set_dqblk = vfs_set_dqblk,
642 };
643 #endif
644
645 static const struct export_operations reiserfs_export_ops = {
646 .encode_fh = reiserfs_encode_fh,
647 .fh_to_dentry = reiserfs_fh_to_dentry,
648 .fh_to_parent = reiserfs_fh_to_parent,
649 .get_parent = reiserfs_get_parent,
650 };
651
652 /* this struct is used in reiserfs_getopt () for containing the value for those
653 mount options that have values rather than being toggles. */
654 typedef struct {
655 char *value;
656 int setmask; /* bitmask which is to set on mount_options bitmask when this
657 value is found, 0 is no bits are to be changed. */
658 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
659 value is found, 0 is no bits are to be changed. This is
660 applied BEFORE setmask */
661 } arg_desc_t;
662
663 /* Set this bit in arg_required to allow empty arguments */
664 #define REISERFS_OPT_ALLOWEMPTY 31
665
666 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
667 mount options */
668 typedef struct {
669 char *option_name;
670 int arg_required; /* 0 if argument is not required, not 0 otherwise */
671 const arg_desc_t *values; /* list of values accepted by an option */
672 int setmask; /* bitmask which is to set on mount_options bitmask when this
673 value is found, 0 is no bits are to be changed. */
674 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
675 value is found, 0 is no bits are to be changed. This is
676 applied BEFORE setmask */
677 } opt_desc_t;
678
679 /* possible values for -o data= */
680 static const arg_desc_t logging_mode[] = {
681 {"ordered", 1 << REISERFS_DATA_ORDERED,
682 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
683 {"journal", 1 << REISERFS_DATA_LOG,
684 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
685 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
686 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
687 {.value = NULL}
688 };
689
690 /* possible values for -o barrier= */
691 static const arg_desc_t barrier_mode[] = {
692 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
693 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
694 {.value = NULL}
695 };
696
697 /* possible values for "-o block-allocator=" and bits which are to be set in
698 s_mount_opt of reiserfs specific part of in-core super block */
699 static const arg_desc_t balloc[] = {
700 {"noborder", 1 << REISERFS_NO_BORDER, 0},
701 {"border", 0, 1 << REISERFS_NO_BORDER},
702 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
703 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
704 {"test4", 1 << REISERFS_TEST4, 0},
705 {"notest4", 0, 1 << REISERFS_TEST4},
706 {NULL, 0, 0}
707 };
708
709 static const arg_desc_t tails[] = {
710 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
711 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
712 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
713 {NULL, 0, 0}
714 };
715
716 static const arg_desc_t error_actions[] = {
717 {"panic", 1 << REISERFS_ERROR_PANIC,
718 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
719 {"ro-remount", 1 << REISERFS_ERROR_RO,
720 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
721 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
722 {"continue", 1 << REISERFS_ERROR_CONTINUE,
723 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
724 #endif
725 {NULL, 0, 0},
726 };
727
728 /* proceed only one option from a list *cur - string containing of mount options
729 opts - array of options which are accepted
730 opt_arg - if option is found and requires an argument and if it is specifed
731 in the input - pointer to the argument is stored here
732 bit_flags - if option requires to set a certain bit - it is set here
733 return -1 if unknown option is found, opt->arg_required otherwise */
734 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
735 char **opt_arg, unsigned long *bit_flags)
736 {
737 char *p;
738 /* foo=bar,
739 ^ ^ ^
740 | | +-- option_end
741 | +-- arg_start
742 +-- option_start
743 */
744 const opt_desc_t *opt;
745 const arg_desc_t *arg;
746
747 p = *cur;
748
749 /* assume argument cannot contain commas */
750 *cur = strchr(p, ',');
751 if (*cur) {
752 *(*cur) = '\0';
753 (*cur)++;
754 }
755
756 if (!strncmp(p, "alloc=", 6)) {
757 /* Ugly special case, probably we should redo options parser so that
758 it can understand several arguments for some options, also so that
759 it can fill several bitfields with option values. */
760 if (reiserfs_parse_alloc_options(s, p + 6)) {
761 return -1;
762 } else {
763 return 0;
764 }
765 }
766
767 /* for every option in the list */
768 for (opt = opts; opt->option_name; opt++) {
769 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
770 if (bit_flags) {
771 if (opt->clrmask ==
772 (1 << REISERFS_UNSUPPORTED_OPT))
773 reiserfs_warning(s, "super-6500",
774 "%s not supported.\n",
775 p);
776 else
777 *bit_flags &= ~opt->clrmask;
778 if (opt->setmask ==
779 (1 << REISERFS_UNSUPPORTED_OPT))
780 reiserfs_warning(s, "super-6501",
781 "%s not supported.\n",
782 p);
783 else
784 *bit_flags |= opt->setmask;
785 }
786 break;
787 }
788 }
789 if (!opt->option_name) {
790 reiserfs_warning(s, "super-6502",
791 "unknown mount option \"%s\"", p);
792 return -1;
793 }
794
795 p += strlen(opt->option_name);
796 switch (*p) {
797 case '=':
798 if (!opt->arg_required) {
799 reiserfs_warning(s, "super-6503",
800 "the option \"%s\" does not "
801 "require an argument\n",
802 opt->option_name);
803 return -1;
804 }
805 break;
806
807 case 0:
808 if (opt->arg_required) {
809 reiserfs_warning(s, "super-6504",
810 "the option \"%s\" requires an "
811 "argument\n", opt->option_name);
812 return -1;
813 }
814 break;
815 default:
816 reiserfs_warning(s, "super-6505",
817 "head of option \"%s\" is only correct\n",
818 opt->option_name);
819 return -1;
820 }
821
822 /* move to the argument, or to next option if argument is not required */
823 p++;
824
825 if (opt->arg_required
826 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
827 && !strlen(p)) {
828 /* this catches "option=," if not allowed */
829 reiserfs_warning(s, "super-6506",
830 "empty argument for \"%s\"\n",
831 opt->option_name);
832 return -1;
833 }
834
835 if (!opt->values) {
836 /* *=NULLopt_arg contains pointer to argument */
837 *opt_arg = p;
838 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
839 }
840
841 /* values possible for this option are listed in opt->values */
842 for (arg = opt->values; arg->value; arg++) {
843 if (!strcmp(p, arg->value)) {
844 if (bit_flags) {
845 *bit_flags &= ~arg->clrmask;
846 *bit_flags |= arg->setmask;
847 }
848 return opt->arg_required;
849 }
850 }
851
852 reiserfs_warning(s, "super-6506",
853 "bad value \"%s\" for option \"%s\"\n", p,
854 opt->option_name);
855 return -1;
856 }
857
858 /* returns 0 if something is wrong in option string, 1 - otherwise */
859 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
860 unsigned long *mount_options,
861 /* after the parsing phase, contains the
862 collection of bitflags defining what
863 mount options were selected. */
864 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
865 char **jdev_name,
866 unsigned int *commit_max_age,
867 char **qf_names,
868 unsigned int *qfmt)
869 {
870 int c;
871 char *arg = NULL;
872 char *pos;
873 opt_desc_t opts[] = {
874 /* Compatibility stuff, so that -o notail for old setups still work */
875 {"tails",.arg_required = 't',.values = tails},
876 {"notail",.clrmask =
877 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
878 {"conv",.setmask = 1 << REISERFS_CONVERT},
879 {"attrs",.setmask = 1 << REISERFS_ATTRS},
880 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
881 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
882 #ifdef CONFIG_REISERFS_FS_XATTR
883 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
884 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
885 #else
886 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
887 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
888 #endif
889 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
890 {"acl",.setmask = 1 << REISERFS_POSIXACL},
891 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
892 #else
893 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
894 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
895 #endif
896 {.option_name = "nolog"},
897 {"replayonly",.setmask = 1 << REPLAYONLY},
898 {"block-allocator",.arg_required = 'a',.values = balloc},
899 {"data",.arg_required = 'd',.values = logging_mode},
900 {"barrier",.arg_required = 'b',.values = barrier_mode},
901 {"resize",.arg_required = 'r',.values = NULL},
902 {"jdev",.arg_required = 'j',.values = NULL},
903 {"nolargeio",.arg_required = 'w',.values = NULL},
904 {"commit",.arg_required = 'c',.values = NULL},
905 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
906 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
907 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
908 {"errors",.arg_required = 'e',.values = error_actions},
909 {"usrjquota",.arg_required =
910 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
911 {"grpjquota",.arg_required =
912 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
913 {"jqfmt",.arg_required = 'f',.values = NULL},
914 {.option_name = NULL}
915 };
916
917 *blocks = 0;
918 if (!options || !*options)
919 /* use default configuration: create tails, journaling on, no
920 conversion to newest format */
921 return 1;
922
923 for (pos = options; pos;) {
924 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
925 if (c == -1)
926 /* wrong option is given */
927 return 0;
928
929 if (c == 'r') {
930 char *p;
931
932 p = NULL;
933 /* "resize=NNN" or "resize=auto" */
934
935 if (!strcmp(arg, "auto")) {
936 /* From JFS code, to auto-get the size. */
937 *blocks =
938 s->s_bdev->bd_inode->i_size >> s->
939 s_blocksize_bits;
940 } else {
941 *blocks = simple_strtoul(arg, &p, 0);
942 if (*p != '\0') {
943 /* NNN does not look like a number */
944 reiserfs_warning(s, "super-6507",
945 "bad value %s for "
946 "-oresize\n", arg);
947 return 0;
948 }
949 }
950 }
951
952 if (c == 'c') {
953 char *p = NULL;
954 unsigned long val = simple_strtoul(arg, &p, 0);
955 /* commit=NNN (time in seconds) */
956 if (*p != '\0' || val >= (unsigned int)-1) {
957 reiserfs_warning(s, "super-6508",
958 "bad value %s for -ocommit\n",
959 arg);
960 return 0;
961 }
962 *commit_max_age = (unsigned int)val;
963 }
964
965 if (c == 'w') {
966 reiserfs_warning(s, "super-6509", "nolargeio option "
967 "is no longer supported");
968 return 0;
969 }
970
971 if (c == 'j') {
972 if (arg && *arg && jdev_name) {
973 if (*jdev_name) { //Hm, already assigned?
974 reiserfs_warning(s, "super-6510",
975 "journal device was "
976 "already specified to "
977 "be %s", *jdev_name);
978 return 0;
979 }
980 *jdev_name = arg;
981 }
982 }
983 #ifdef CONFIG_QUOTA
984 if (c == 'u' || c == 'g') {
985 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
986
987 if (sb_any_quota_loaded(s) &&
988 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
989 reiserfs_warning(s, "super-6511",
990 "cannot change journaled "
991 "quota options when quota "
992 "turned on.");
993 return 0;
994 }
995 if (*arg) { /* Some filename specified? */
996 if (REISERFS_SB(s)->s_qf_names[qtype]
997 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
998 arg)) {
999 reiserfs_warning(s, "super-6512",
1000 "%s quota file "
1001 "already specified.",
1002 QTYPE2NAME(qtype));
1003 return 0;
1004 }
1005 if (strchr(arg, '/')) {
1006 reiserfs_warning(s, "super-6513",
1007 "quotafile must be "
1008 "on filesystem root.");
1009 return 0;
1010 }
1011 qf_names[qtype] =
1012 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1013 if (!qf_names[qtype]) {
1014 reiserfs_warning(s, "reiserfs-2502",
1015 "not enough memory "
1016 "for storing "
1017 "quotafile name.");
1018 return 0;
1019 }
1020 strcpy(qf_names[qtype], arg);
1021 *mount_options |= 1 << REISERFS_QUOTA;
1022 } else {
1023 if (qf_names[qtype] !=
1024 REISERFS_SB(s)->s_qf_names[qtype])
1025 kfree(qf_names[qtype]);
1026 qf_names[qtype] = NULL;
1027 }
1028 }
1029 if (c == 'f') {
1030 if (!strcmp(arg, "vfsold"))
1031 *qfmt = QFMT_VFS_OLD;
1032 else if (!strcmp(arg, "vfsv0"))
1033 *qfmt = QFMT_VFS_V0;
1034 else {
1035 reiserfs_warning(s, "super-6514",
1036 "unknown quota format "
1037 "specified.");
1038 return 0;
1039 }
1040 if (sb_any_quota_loaded(s) &&
1041 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1042 reiserfs_warning(s, "super-6515",
1043 "cannot change journaled "
1044 "quota options when quota "
1045 "turned on.");
1046 return 0;
1047 }
1048 }
1049 #else
1050 if (c == 'u' || c == 'g' || c == 'f') {
1051 reiserfs_warning(s, "reiserfs-2503", "journaled "
1052 "quota options not supported.");
1053 return 0;
1054 }
1055 #endif
1056 }
1057
1058 #ifdef CONFIG_QUOTA
1059 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1060 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1061 reiserfs_warning(s, "super-6515",
1062 "journaled quota format not specified.");
1063 return 0;
1064 }
1065 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1066 if (!(*mount_options & (1 << REISERFS_QUOTA))
1067 && sb_any_quota_loaded(s)) {
1068 reiserfs_warning(s, "super-6516", "quota options must "
1069 "be present when quota is turned on.");
1070 return 0;
1071 }
1072 #endif
1073
1074 return 1;
1075 }
1076
1077 static void switch_data_mode(struct super_block *s, unsigned long mode)
1078 {
1079 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1080 (1 << REISERFS_DATA_ORDERED) |
1081 (1 << REISERFS_DATA_WRITEBACK));
1082 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1083 }
1084
1085 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1086 {
1087 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1088 if (!reiserfs_data_log(s)) {
1089 switch_data_mode(s, REISERFS_DATA_LOG);
1090 reiserfs_info(s, "switching to journaled data mode\n");
1091 }
1092 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1093 if (!reiserfs_data_ordered(s)) {
1094 switch_data_mode(s, REISERFS_DATA_ORDERED);
1095 reiserfs_info(s, "switching to ordered data mode\n");
1096 }
1097 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1098 if (!reiserfs_data_writeback(s)) {
1099 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1100 reiserfs_info(s, "switching to writeback data mode\n");
1101 }
1102 }
1103 }
1104
1105 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1106 {
1107 int flush = (1 << REISERFS_BARRIER_FLUSH);
1108 int none = (1 << REISERFS_BARRIER_NONE);
1109 int all_barrier = flush | none;
1110
1111 if (bits & all_barrier) {
1112 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1113 if (bits & flush) {
1114 REISERFS_SB(s)->s_mount_opt |= flush;
1115 printk("reiserfs: enabling write barrier flush mode\n");
1116 } else if (bits & none) {
1117 REISERFS_SB(s)->s_mount_opt |= none;
1118 printk("reiserfs: write barriers turned off\n");
1119 }
1120 }
1121 }
1122
1123 static void handle_attrs(struct super_block *s)
1124 {
1125 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1126
1127 if (reiserfs_attrs(s)) {
1128 if (old_format_only(s)) {
1129 reiserfs_warning(s, "super-6517", "cannot support "
1130 "attributes on 3.5.x disk format");
1131 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1132 return;
1133 }
1134 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1135 reiserfs_warning(s, "super-6518", "cannot support "
1136 "attributes until flag is set in "
1137 "super-block");
1138 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1139 }
1140 }
1141 }
1142
1143 #ifdef CONFIG_QUOTA
1144 static void handle_quota_files(struct super_block *s, char **qf_names,
1145 unsigned int *qfmt)
1146 {
1147 int i;
1148
1149 for (i = 0; i < MAXQUOTAS; i++) {
1150 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1151 kfree(REISERFS_SB(s)->s_qf_names[i]);
1152 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1153 }
1154 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1155 }
1156 #endif
1157
1158 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1159 {
1160 struct reiserfs_super_block *rs;
1161 struct reiserfs_transaction_handle th;
1162 unsigned long blocks;
1163 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1164 unsigned long safe_mask = 0;
1165 unsigned int commit_max_age = (unsigned int)-1;
1166 struct reiserfs_journal *journal = SB_JOURNAL(s);
1167 char *new_opts = kstrdup(arg, GFP_KERNEL);
1168 int err;
1169 char *qf_names[MAXQUOTAS];
1170 unsigned int qfmt = 0;
1171 #ifdef CONFIG_QUOTA
1172 int i;
1173 #endif
1174
1175 reiserfs_write_lock(s);
1176
1177 #ifdef CONFIG_QUOTA
1178 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1179 #endif
1180
1181 rs = SB_DISK_SUPER_BLOCK(s);
1182
1183 if (!reiserfs_parse_options
1184 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1185 qf_names, &qfmt)) {
1186 #ifdef CONFIG_QUOTA
1187 for (i = 0; i < MAXQUOTAS; i++)
1188 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1189 kfree(qf_names[i]);
1190 #endif
1191 err = -EINVAL;
1192 goto out_err;
1193 }
1194 #ifdef CONFIG_QUOTA
1195 handle_quota_files(s, qf_names, &qfmt);
1196 #endif
1197
1198 handle_attrs(s);
1199
1200 /* Add options that are safe here */
1201 safe_mask |= 1 << REISERFS_SMALLTAIL;
1202 safe_mask |= 1 << REISERFS_LARGETAIL;
1203 safe_mask |= 1 << REISERFS_NO_BORDER;
1204 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1205 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1206 safe_mask |= 1 << REISERFS_TEST4;
1207 safe_mask |= 1 << REISERFS_ATTRS;
1208 safe_mask |= 1 << REISERFS_XATTRS_USER;
1209 safe_mask |= 1 << REISERFS_POSIXACL;
1210 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1211 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1212 safe_mask |= 1 << REISERFS_ERROR_RO;
1213 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1214 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1215 safe_mask |= 1 << REISERFS_QUOTA;
1216
1217 /* Update the bitmask, taking care to keep
1218 * the bits we're not allowed to change here */
1219 REISERFS_SB(s)->s_mount_opt =
1220 (REISERFS_SB(s)->
1221 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1222
1223 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1224 journal->j_max_commit_age = commit_max_age;
1225 journal->j_max_trans_age = commit_max_age;
1226 } else if (commit_max_age == 0) {
1227 /* 0 means restore defaults. */
1228 journal->j_max_commit_age = journal->j_default_max_commit_age;
1229 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1230 }
1231
1232 if (blocks) {
1233 err = reiserfs_resize(s, blocks);
1234 if (err != 0)
1235 goto out_err;
1236 }
1237
1238 if (*mount_flags & MS_RDONLY) {
1239 reiserfs_xattr_init(s, *mount_flags);
1240 /* remount read-only */
1241 if (s->s_flags & MS_RDONLY)
1242 /* it is read-only already */
1243 goto out_ok;
1244 /* try to remount file system with read-only permissions */
1245 if (sb_umount_state(rs) == REISERFS_VALID_FS
1246 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1247 goto out_ok;
1248 }
1249
1250 err = journal_begin(&th, s, 10);
1251 if (err)
1252 goto out_err;
1253
1254 /* Mounting a rw partition read-only. */
1255 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1256 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1257 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1258 } else {
1259 /* remount read-write */
1260 if (!(s->s_flags & MS_RDONLY)) {
1261 reiserfs_xattr_init(s, *mount_flags);
1262 goto out_ok; /* We are read-write already */
1263 }
1264
1265 if (reiserfs_is_journal_aborted(journal)) {
1266 err = journal->j_errno;
1267 goto out_err;
1268 }
1269
1270 handle_data_mode(s, mount_options);
1271 handle_barrier_mode(s, mount_options);
1272 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1273 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1274 err = journal_begin(&th, s, 10);
1275 if (err)
1276 goto out_err;
1277
1278 /* Mount a partition which is read-only, read-write */
1279 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1280 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1281 s->s_flags &= ~MS_RDONLY;
1282 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1283 if (!old_format_only(s))
1284 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1285 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1286 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1287 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1288 }
1289 /* this will force a full flush of all journal lists */
1290 SB_JOURNAL(s)->j_must_wait = 1;
1291 err = journal_end(&th, s, 10);
1292 if (err)
1293 goto out_err;
1294 s->s_dirt = 0;
1295
1296 if (!(*mount_flags & MS_RDONLY)) {
1297 finish_unfinished(s);
1298 reiserfs_xattr_init(s, *mount_flags);
1299 }
1300
1301 out_ok:
1302 replace_mount_options(s, new_opts);
1303 reiserfs_write_unlock(s);
1304 return 0;
1305
1306 out_err:
1307 kfree(new_opts);
1308 reiserfs_write_unlock(s);
1309 return err;
1310 }
1311
1312 static int read_super_block(struct super_block *s, int offset)
1313 {
1314 struct buffer_head *bh;
1315 struct reiserfs_super_block *rs;
1316 int fs_blocksize;
1317
1318 bh = sb_bread(s, offset / s->s_blocksize);
1319 if (!bh) {
1320 reiserfs_warning(s, "sh-2006",
1321 "bread failed (dev %s, block %lu, size %lu)",
1322 reiserfs_bdevname(s), offset / s->s_blocksize,
1323 s->s_blocksize);
1324 return 1;
1325 }
1326
1327 rs = (struct reiserfs_super_block *)bh->b_data;
1328 if (!is_any_reiserfs_magic_string(rs)) {
1329 brelse(bh);
1330 return 1;
1331 }
1332 //
1333 // ok, reiserfs signature (old or new) found in at the given offset
1334 //
1335 fs_blocksize = sb_blocksize(rs);
1336 brelse(bh);
1337 sb_set_blocksize(s, fs_blocksize);
1338
1339 bh = sb_bread(s, offset / s->s_blocksize);
1340 if (!bh) {
1341 reiserfs_warning(s, "sh-2007",
1342 "bread failed (dev %s, block %lu, size %lu)",
1343 reiserfs_bdevname(s), offset / s->s_blocksize,
1344 s->s_blocksize);
1345 return 1;
1346 }
1347
1348 rs = (struct reiserfs_super_block *)bh->b_data;
1349 if (sb_blocksize(rs) != s->s_blocksize) {
1350 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1351 "filesystem on (dev %s, block %Lu, size %lu)",
1352 reiserfs_bdevname(s),
1353 (unsigned long long)bh->b_blocknr,
1354 s->s_blocksize);
1355 brelse(bh);
1356 return 1;
1357 }
1358
1359 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1360 brelse(bh);
1361 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1362 "--rebuild-tree run detected. Please run\n"
1363 "reiserfsck --rebuild-tree and wait for a "
1364 "completion. If that fails\n"
1365 "get newer reiserfsprogs package");
1366 return 1;
1367 }
1368
1369 SB_BUFFER_WITH_SB(s) = bh;
1370 SB_DISK_SUPER_BLOCK(s) = rs;
1371
1372 if (is_reiserfs_jr(rs)) {
1373 /* magic is of non-standard journal filesystem, look at s_version to
1374 find which format is in use */
1375 if (sb_version(rs) == REISERFS_VERSION_2)
1376 reiserfs_info(s, "found reiserfs format \"3.6\""
1377 " with non-standard journal\n");
1378 else if (sb_version(rs) == REISERFS_VERSION_1)
1379 reiserfs_info(s, "found reiserfs format \"3.5\""
1380 " with non-standard journal\n");
1381 else {
1382 reiserfs_warning(s, "sh-2012", "found unknown "
1383 "format \"%u\" of reiserfs with "
1384 "non-standard magic", sb_version(rs));
1385 return 1;
1386 }
1387 } else
1388 /* s_version of standard format may contain incorrect information,
1389 so we just look at the magic string */
1390 reiserfs_info(s,
1391 "found reiserfs format \"%s\" with standard journal\n",
1392 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1393
1394 s->s_op = &reiserfs_sops;
1395 s->s_export_op = &reiserfs_export_ops;
1396 #ifdef CONFIG_QUOTA
1397 s->s_qcop = &reiserfs_qctl_operations;
1398 s->dq_op = &reiserfs_quota_operations;
1399 #endif
1400
1401 /* new format is limited by the 32 bit wide i_blocks field, want to
1402 ** be one full block below that.
1403 */
1404 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1405 return 0;
1406 }
1407
1408 /* after journal replay, reread all bitmap and super blocks */
1409 static int reread_meta_blocks(struct super_block *s)
1410 {
1411 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1412 reiserfs_write_unlock(s);
1413 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1414 reiserfs_write_lock(s);
1415 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1416 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1417 return 1;
1418 }
1419
1420 return 0;
1421 }
1422
1423 /////////////////////////////////////////////////////
1424 // hash detection stuff
1425
1426 // if root directory is empty - we set default - Yura's - hash and
1427 // warn about it
1428 // FIXME: we look for only one name in a directory. If tea and yura
1429 // bith have the same value - we ask user to send report to the
1430 // mailing list
1431 static __u32 find_hash_out(struct super_block *s)
1432 {
1433 int retval;
1434 struct inode *inode;
1435 struct cpu_key key;
1436 INITIALIZE_PATH(path);
1437 struct reiserfs_dir_entry de;
1438 __u32 hash = DEFAULT_HASH;
1439
1440 inode = s->s_root->d_inode;
1441
1442 do { // Some serious "goto"-hater was there ;)
1443 u32 teahash, r5hash, yurahash;
1444
1445 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1446 retval = search_by_entry_key(s, &key, &path, &de);
1447 if (retval == IO_ERROR) {
1448 pathrelse(&path);
1449 return UNSET_HASH;
1450 }
1451 if (retval == NAME_NOT_FOUND)
1452 de.de_entry_num--;
1453 set_de_name_and_namelen(&de);
1454 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1455 /* allow override in this case */
1456 if (reiserfs_rupasov_hash(s)) {
1457 hash = YURA_HASH;
1458 }
1459 reiserfs_info(s, "FS seems to be empty, autodetect "
1460 "is using the default hash\n");
1461 break;
1462 }
1463 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1464 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1465 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1466 if (((teahash == r5hash)
1467 &&
1468 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1469 == r5hash)) || ((teahash == yurahash)
1470 && (yurahash ==
1471 GET_HASH_VALUE(deh_offset
1472 (&
1473 (de.
1474 de_deh[de.
1475 de_entry_num])))))
1476 || ((r5hash == yurahash)
1477 && (yurahash ==
1478 GET_HASH_VALUE(deh_offset
1479 (&(de.de_deh[de.de_entry_num])))))) {
1480 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1481 "automatically detect hash function. "
1482 "Please mount with -o "
1483 "hash={tea,rupasov,r5}");
1484 hash = UNSET_HASH;
1485 break;
1486 }
1487 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1488 yurahash)
1489 hash = YURA_HASH;
1490 else if (GET_HASH_VALUE
1491 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1492 hash = TEA_HASH;
1493 else if (GET_HASH_VALUE
1494 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1495 hash = R5_HASH;
1496 else {
1497 reiserfs_warning(s, "reiserfs-2506",
1498 "Unrecognised hash function");
1499 hash = UNSET_HASH;
1500 }
1501 } while (0);
1502
1503 pathrelse(&path);
1504 return hash;
1505 }
1506
1507 // finds out which hash names are sorted with
1508 static int what_hash(struct super_block *s)
1509 {
1510 __u32 code;
1511
1512 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1513
1514 /* reiserfs_hash_detect() == true if any of the hash mount options
1515 ** were used. We must check them to make sure the user isn't
1516 ** using a bad hash value
1517 */
1518 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1519 code = find_hash_out(s);
1520
1521 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1522 /* detection has found the hash, and we must check against the
1523 ** mount options
1524 */
1525 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1526 reiserfs_warning(s, "reiserfs-2507",
1527 "Error, %s hash detected, "
1528 "unable to force rupasov hash",
1529 reiserfs_hashname(code));
1530 code = UNSET_HASH;
1531 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1532 reiserfs_warning(s, "reiserfs-2508",
1533 "Error, %s hash detected, "
1534 "unable to force tea hash",
1535 reiserfs_hashname(code));
1536 code = UNSET_HASH;
1537 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1538 reiserfs_warning(s, "reiserfs-2509",
1539 "Error, %s hash detected, "
1540 "unable to force r5 hash",
1541 reiserfs_hashname(code));
1542 code = UNSET_HASH;
1543 }
1544 } else {
1545 /* find_hash_out was not called or could not determine the hash */
1546 if (reiserfs_rupasov_hash(s)) {
1547 code = YURA_HASH;
1548 } else if (reiserfs_tea_hash(s)) {
1549 code = TEA_HASH;
1550 } else if (reiserfs_r5_hash(s)) {
1551 code = R5_HASH;
1552 }
1553 }
1554
1555 /* if we are mounted RW, and we have a new valid hash code, update
1556 ** the super
1557 */
1558 if (code != UNSET_HASH &&
1559 !(s->s_flags & MS_RDONLY) &&
1560 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1561 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1562 }
1563 return code;
1564 }
1565
1566 // return pointer to appropriate function
1567 static hashf_t hash_function(struct super_block *s)
1568 {
1569 switch (what_hash(s)) {
1570 case TEA_HASH:
1571 reiserfs_info(s, "Using tea hash to sort names\n");
1572 return keyed_hash;
1573 case YURA_HASH:
1574 reiserfs_info(s, "Using rupasov hash to sort names\n");
1575 return yura_hash;
1576 case R5_HASH:
1577 reiserfs_info(s, "Using r5 hash to sort names\n");
1578 return r5_hash;
1579 }
1580 return NULL;
1581 }
1582
1583 // this is used to set up correct value for old partitions
1584 static int function2code(hashf_t func)
1585 {
1586 if (func == keyed_hash)
1587 return TEA_HASH;
1588 if (func == yura_hash)
1589 return YURA_HASH;
1590 if (func == r5_hash)
1591 return R5_HASH;
1592
1593 BUG(); // should never happen
1594
1595 return 0;
1596 }
1597
1598 #define SWARN(silent, s, id, ...) \
1599 if (!(silent)) \
1600 reiserfs_warning(s, id, __VA_ARGS__)
1601
1602 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1603 {
1604 struct inode *root_inode;
1605 struct reiserfs_transaction_handle th;
1606 int old_format = 0;
1607 unsigned long blocks;
1608 unsigned int commit_max_age = 0;
1609 int jinit_done = 0;
1610 struct reiserfs_iget_args args;
1611 struct reiserfs_super_block *rs;
1612 char *jdev_name;
1613 struct reiserfs_sb_info *sbi;
1614 int errval = -EINVAL;
1615 char *qf_names[MAXQUOTAS] = {};
1616 unsigned int qfmt = 0;
1617
1618 save_mount_options(s, data);
1619
1620 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1621 if (!sbi) {
1622 errval = -ENOMEM;
1623 goto error_alloc;
1624 }
1625 s->s_fs_info = sbi;
1626 /* Set default values for options: non-aggressive tails, RO on errors */
1627 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1628 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1629 /* no preallocation minimum, be smart in
1630 reiserfs_file_write instead */
1631 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1632 /* Preallocate by 16 blocks (17-1) at once */
1633 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1634 /* setup default block allocator options */
1635 reiserfs_init_alloc_options(s);
1636
1637 mutex_init(&REISERFS_SB(s)->lock);
1638 REISERFS_SB(s)->lock_depth = -1;
1639
1640 /*
1641 * This function is called with the bkl, which also was the old
1642 * locking used here.
1643 * do_journal_begin() will soon check if we hold the lock (ie: was the
1644 * bkl). This is likely because do_journal_begin() has several another
1645 * callers because at this time, it doesn't seem to be necessary to
1646 * protect against anything.
1647 * Anyway, let's be conservative and lock for now.
1648 */
1649 reiserfs_write_lock(s);
1650
1651 jdev_name = NULL;
1652 if (reiserfs_parse_options
1653 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1654 &commit_max_age, qf_names, &qfmt) == 0) {
1655 goto error;
1656 }
1657 #ifdef CONFIG_QUOTA
1658 handle_quota_files(s, qf_names, &qfmt);
1659 #endif
1660
1661 if (blocks) {
1662 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1663 goto error;
1664 }
1665
1666 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1667 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1668 old_format = 1;
1669 /* try new format (64-th 1k block), which can contain reiserfs super block */
1670 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1671 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1672 reiserfs_bdevname(s));
1673 goto error;
1674 }
1675
1676 rs = SB_DISK_SUPER_BLOCK(s);
1677 /* Let's do basic sanity check to verify that underlying device is not
1678 smaller than the filesystem. If the check fails then abort and scream,
1679 because bad stuff will happen otherwise. */
1680 if (s->s_bdev && s->s_bdev->bd_inode
1681 && i_size_read(s->s_bdev->bd_inode) <
1682 sb_block_count(rs) * sb_blocksize(rs)) {
1683 SWARN(silent, s, "", "Filesystem cannot be "
1684 "mounted because it is bigger than the device");
1685 SWARN(silent, s, "", "You may need to run fsck "
1686 "or increase size of your LVM partition");
1687 SWARN(silent, s, "", "Or may be you forgot to "
1688 "reboot after fdisk when it told you to");
1689 goto error;
1690 }
1691
1692 sbi->s_mount_state = SB_REISERFS_STATE(s);
1693 sbi->s_mount_state = REISERFS_VALID_FS;
1694
1695 if ((errval = reiserfs_init_bitmap_cache(s))) {
1696 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1697 goto error;
1698 }
1699 errval = -EINVAL;
1700 #ifdef CONFIG_REISERFS_CHECK
1701 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1702 SWARN(silent, s, "", "- it is slow mode for debugging.");
1703 #endif
1704
1705 /* make data=ordered the default */
1706 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1707 !reiserfs_data_writeback(s)) {
1708 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1709 }
1710
1711 if (reiserfs_data_log(s)) {
1712 reiserfs_info(s, "using journaled data mode\n");
1713 } else if (reiserfs_data_ordered(s)) {
1714 reiserfs_info(s, "using ordered data mode\n");
1715 } else {
1716 reiserfs_info(s, "using writeback data mode\n");
1717 }
1718 if (reiserfs_barrier_flush(s)) {
1719 printk("reiserfs: using flush barriers\n");
1720 }
1721 // set_device_ro(s->s_dev, 1) ;
1722 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1723 SWARN(silent, s, "sh-2022",
1724 "unable to initialize journal space");
1725 goto error;
1726 } else {
1727 jinit_done = 1; /* once this is set, journal_release must be called
1728 ** if we error out of the mount
1729 */
1730 }
1731 if (reread_meta_blocks(s)) {
1732 SWARN(silent, s, "jmacd-9",
1733 "unable to reread meta blocks after journal init");
1734 goto error;
1735 }
1736
1737 if (replay_only(s))
1738 goto error;
1739
1740 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1741 SWARN(silent, s, "clm-7000",
1742 "Detected readonly device, marking FS readonly");
1743 s->s_flags |= MS_RDONLY;
1744 }
1745 args.objectid = REISERFS_ROOT_OBJECTID;
1746 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1747 root_inode =
1748 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1749 reiserfs_init_locked_inode, (void *)(&args));
1750 if (!root_inode) {
1751 SWARN(silent, s, "jmacd-10", "get root inode failed");
1752 goto error;
1753 }
1754
1755 if (root_inode->i_state & I_NEW) {
1756 reiserfs_read_locked_inode(root_inode, &args);
1757 unlock_new_inode(root_inode);
1758 }
1759
1760 s->s_root = d_alloc_root(root_inode);
1761 if (!s->s_root) {
1762 iput(root_inode);
1763 goto error;
1764 }
1765 // define and initialize hash function
1766 sbi->s_hash_function = hash_function(s);
1767 if (sbi->s_hash_function == NULL) {
1768 dput(s->s_root);
1769 s->s_root = NULL;
1770 goto error;
1771 }
1772
1773 if (is_reiserfs_3_5(rs)
1774 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1775 set_bit(REISERFS_3_5, &(sbi->s_properties));
1776 else if (old_format)
1777 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1778 else
1779 set_bit(REISERFS_3_6, &(sbi->s_properties));
1780
1781 if (!(s->s_flags & MS_RDONLY)) {
1782
1783 errval = journal_begin(&th, s, 1);
1784 if (errval) {
1785 dput(s->s_root);
1786 s->s_root = NULL;
1787 goto error;
1788 }
1789 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1790
1791 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1792 set_sb_fs_state(rs, 0);
1793
1794 /* Clear out s_bmap_nr if it would wrap. We can handle this
1795 * case, but older revisions can't. This will cause the
1796 * file system to fail mount on those older implementations,
1797 * avoiding corruption. -jeffm */
1798 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1799 sb_bmap_nr(rs) != 0) {
1800 reiserfs_warning(s, "super-2030", "This file system "
1801 "claims to use %u bitmap blocks in "
1802 "its super block, but requires %u. "
1803 "Clearing to zero.", sb_bmap_nr(rs),
1804 reiserfs_bmap_count(s));
1805
1806 set_sb_bmap_nr(rs, 0);
1807 }
1808
1809 if (old_format_only(s)) {
1810 /* filesystem of format 3.5 either with standard or non-standard
1811 journal */
1812 if (convert_reiserfs(s)) {
1813 /* and -o conv is given */
1814 if (!silent)
1815 reiserfs_info(s,
1816 "converting 3.5 filesystem to the 3.6 format");
1817
1818 if (is_reiserfs_3_5(rs))
1819 /* put magic string of 3.6 format. 2.2 will not be able to
1820 mount this filesystem anymore */
1821 memcpy(rs->s_v1.s_magic,
1822 reiserfs_3_6_magic_string,
1823 sizeof
1824 (reiserfs_3_6_magic_string));
1825
1826 set_sb_version(rs, REISERFS_VERSION_2);
1827 reiserfs_convert_objectid_map_v1(s);
1828 set_bit(REISERFS_3_6, &(sbi->s_properties));
1829 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1830 } else if (!silent) {
1831 reiserfs_info(s, "using 3.5.x disk format\n");
1832 }
1833 } else
1834 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1835
1836
1837 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1838 errval = journal_end(&th, s, 1);
1839 if (errval) {
1840 dput(s->s_root);
1841 s->s_root = NULL;
1842 goto error;
1843 }
1844
1845 if ((errval = reiserfs_lookup_privroot(s)) ||
1846 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1847 dput(s->s_root);
1848 s->s_root = NULL;
1849 goto error;
1850 }
1851
1852 /* look for files which were to be removed in previous session */
1853 finish_unfinished(s);
1854 } else {
1855 if (old_format_only(s) && !silent) {
1856 reiserfs_info(s, "using 3.5.x disk format\n");
1857 }
1858
1859 if ((errval = reiserfs_lookup_privroot(s)) ||
1860 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1861 dput(s->s_root);
1862 s->s_root = NULL;
1863 goto error;
1864 }
1865 }
1866 // mark hash in super block: it could be unset. overwrite should be ok
1867 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1868
1869 handle_attrs(s);
1870
1871 reiserfs_proc_info_init(s);
1872
1873 init_waitqueue_head(&(sbi->s_wait));
1874 spin_lock_init(&sbi->bitmap_lock);
1875
1876 reiserfs_write_unlock(s);
1877
1878 return (0);
1879
1880 error:
1881 reiserfs_write_unlock(s);
1882 error_alloc:
1883 if (jinit_done) { /* kill the commit thread, free journal ram */
1884 journal_release_error(NULL, s);
1885 }
1886
1887 reiserfs_free_bitmap_cache(s);
1888 if (SB_BUFFER_WITH_SB(s))
1889 brelse(SB_BUFFER_WITH_SB(s));
1890 #ifdef CONFIG_QUOTA
1891 {
1892 int j;
1893 for (j = 0; j < MAXQUOTAS; j++)
1894 kfree(qf_names[j]);
1895 }
1896 #endif
1897 kfree(sbi);
1898
1899 s->s_fs_info = NULL;
1900 return errval;
1901 }
1902
1903 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1904 {
1905 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1906
1907 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1908 buf->f_bfree = sb_free_blocks(rs);
1909 buf->f_bavail = buf->f_bfree;
1910 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1911 buf->f_bsize = dentry->d_sb->s_blocksize;
1912 /* changed to accommodate gcc folks. */
1913 buf->f_type = REISERFS_SUPER_MAGIC;
1914 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1915 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1916 sizeof(rs->s_uuid)/2);
1917
1918 return 0;
1919 }
1920
1921 #ifdef CONFIG_QUOTA
1922 static int reiserfs_write_dquot(struct dquot *dquot)
1923 {
1924 struct reiserfs_transaction_handle th;
1925 int ret, err;
1926
1927 reiserfs_write_lock(dquot->dq_sb);
1928 ret =
1929 journal_begin(&th, dquot->dq_sb,
1930 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1931 if (ret)
1932 goto out;
1933 ret = dquot_commit(dquot);
1934 err =
1935 journal_end(&th, dquot->dq_sb,
1936 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1937 if (!ret && err)
1938 ret = err;
1939 out:
1940 reiserfs_write_unlock(dquot->dq_sb);
1941 return ret;
1942 }
1943
1944 static int reiserfs_acquire_dquot(struct dquot *dquot)
1945 {
1946 struct reiserfs_transaction_handle th;
1947 int ret, err;
1948
1949 reiserfs_write_lock(dquot->dq_sb);
1950 ret =
1951 journal_begin(&th, dquot->dq_sb,
1952 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1953 if (ret)
1954 goto out;
1955 ret = dquot_acquire(dquot);
1956 err =
1957 journal_end(&th, dquot->dq_sb,
1958 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1959 if (!ret && err)
1960 ret = err;
1961 out:
1962 reiserfs_write_unlock(dquot->dq_sb);
1963 return ret;
1964 }
1965
1966 static int reiserfs_release_dquot(struct dquot *dquot)
1967 {
1968 struct reiserfs_transaction_handle th;
1969 int ret, err;
1970
1971 reiserfs_write_lock(dquot->dq_sb);
1972 ret =
1973 journal_begin(&th, dquot->dq_sb,
1974 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1975 if (ret) {
1976 /* Release dquot anyway to avoid endless cycle in dqput() */
1977 dquot_release(dquot);
1978 goto out;
1979 }
1980 ret = dquot_release(dquot);
1981 err =
1982 journal_end(&th, dquot->dq_sb,
1983 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1984 if (!ret && err)
1985 ret = err;
1986 out:
1987 reiserfs_write_unlock(dquot->dq_sb);
1988 return ret;
1989 }
1990
1991 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1992 {
1993 /* Are we journaling quotas? */
1994 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1995 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1996 dquot_mark_dquot_dirty(dquot);
1997 return reiserfs_write_dquot(dquot);
1998 } else
1999 return dquot_mark_dquot_dirty(dquot);
2000 }
2001
2002 static int reiserfs_write_info(struct super_block *sb, int type)
2003 {
2004 struct reiserfs_transaction_handle th;
2005 int ret, err;
2006
2007 /* Data block + inode block */
2008 reiserfs_write_lock(sb);
2009 ret = journal_begin(&th, sb, 2);
2010 if (ret)
2011 goto out;
2012 ret = dquot_commit_info(sb, type);
2013 err = journal_end(&th, sb, 2);
2014 if (!ret && err)
2015 ret = err;
2016 out:
2017 reiserfs_write_unlock(sb);
2018 return ret;
2019 }
2020
2021 /*
2022 * Turn on quotas during mount time - we need to find the quota file and such...
2023 */
2024 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2025 {
2026 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2027 REISERFS_SB(sb)->s_jquota_fmt, type);
2028 }
2029
2030 /*
2031 * Standard function to be called on quota_on
2032 */
2033 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2034 char *name, int remount)
2035 {
2036 int err;
2037 struct path path;
2038 struct inode *inode;
2039 struct reiserfs_transaction_handle th;
2040
2041 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2042 return -EINVAL;
2043 /* No more checks needed? Path and format_id are bogus anyway... */
2044 if (remount)
2045 return vfs_quota_on(sb, type, format_id, name, 1);
2046 err = kern_path(name, LOOKUP_FOLLOW, &path);
2047 if (err)
2048 return err;
2049 /* Quotafile not on the same filesystem? */
2050 if (path.mnt->mnt_sb != sb) {
2051 err = -EXDEV;
2052 goto out;
2053 }
2054 inode = path.dentry->d_inode;
2055 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2056 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2057 err = reiserfs_unpack(inode, NULL);
2058 if (err) {
2059 reiserfs_warning(sb, "super-6520",
2060 "Unpacking tail of quota file failed"
2061 " (%d). Cannot turn on quotas.", err);
2062 err = -EINVAL;
2063 goto out;
2064 }
2065 mark_inode_dirty(inode);
2066 }
2067 /* Journaling quota? */
2068 if (REISERFS_SB(sb)->s_qf_names[type]) {
2069 /* Quotafile not of fs root? */
2070 if (path.dentry->d_parent != sb->s_root)
2071 reiserfs_warning(sb, "super-6521",
2072 "Quota file not on filesystem root. "
2073 "Journalled quota will not work.");
2074 }
2075
2076 /*
2077 * When we journal data on quota file, we have to flush journal to see
2078 * all updates to the file when we bypass pagecache...
2079 */
2080 if (reiserfs_file_data_log(inode)) {
2081 /* Just start temporary transaction and finish it */
2082 err = journal_begin(&th, sb, 1);
2083 if (err)
2084 goto out;
2085 err = journal_end_sync(&th, sb, 1);
2086 if (err)
2087 goto out;
2088 }
2089 err = vfs_quota_on_path(sb, type, format_id, &path);
2090 out:
2091 path_put(&path);
2092 return err;
2093 }
2094
2095 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2096 * acquiring the locks... As quota files are never truncated and quota code
2097 * itself serializes the operations (and noone else should touch the files)
2098 * we don't have to be afraid of races */
2099 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2100 size_t len, loff_t off)
2101 {
2102 struct inode *inode = sb_dqopt(sb)->files[type];
2103 unsigned long blk = off >> sb->s_blocksize_bits;
2104 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2105 size_t toread;
2106 struct buffer_head tmp_bh, *bh;
2107 loff_t i_size = i_size_read(inode);
2108
2109 if (off > i_size)
2110 return 0;
2111 if (off + len > i_size)
2112 len = i_size - off;
2113 toread = len;
2114 while (toread > 0) {
2115 tocopy =
2116 sb->s_blocksize - offset <
2117 toread ? sb->s_blocksize - offset : toread;
2118 tmp_bh.b_state = 0;
2119 /* Quota files are without tails so we can safely use this function */
2120 reiserfs_write_lock(sb);
2121 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2122 reiserfs_write_unlock(sb);
2123 if (err)
2124 return err;
2125 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2126 memset(data, 0, tocopy);
2127 else {
2128 bh = sb_bread(sb, tmp_bh.b_blocknr);
2129 if (!bh)
2130 return -EIO;
2131 memcpy(data, bh->b_data + offset, tocopy);
2132 brelse(bh);
2133 }
2134 offset = 0;
2135 toread -= tocopy;
2136 data += tocopy;
2137 blk++;
2138 }
2139 return len;
2140 }
2141
2142 /* Write to quotafile (we know the transaction is already started and has
2143 * enough credits) */
2144 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2145 const char *data, size_t len, loff_t off)
2146 {
2147 struct inode *inode = sb_dqopt(sb)->files[type];
2148 unsigned long blk = off >> sb->s_blocksize_bits;
2149 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2150 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2151 size_t towrite = len;
2152 struct buffer_head tmp_bh, *bh;
2153
2154 if (!current->journal_info) {
2155 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2156 " cancelled because transaction is not started.\n",
2157 (unsigned long long)off, (unsigned long long)len);
2158 return -EIO;
2159 }
2160 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2161 while (towrite > 0) {
2162 tocopy = sb->s_blocksize - offset < towrite ?
2163 sb->s_blocksize - offset : towrite;
2164 tmp_bh.b_state = 0;
2165 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2166 if (err)
2167 goto out;
2168 if (offset || tocopy != sb->s_blocksize)
2169 bh = sb_bread(sb, tmp_bh.b_blocknr);
2170 else
2171 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2172 if (!bh) {
2173 err = -EIO;
2174 goto out;
2175 }
2176 lock_buffer(bh);
2177 memcpy(bh->b_data + offset, data, tocopy);
2178 flush_dcache_page(bh->b_page);
2179 set_buffer_uptodate(bh);
2180 unlock_buffer(bh);
2181 reiserfs_prepare_for_journal(sb, bh, 1);
2182 journal_mark_dirty(current->journal_info, sb, bh);
2183 if (!journal_quota)
2184 reiserfs_add_ordered_list(inode, bh);
2185 brelse(bh);
2186 offset = 0;
2187 towrite -= tocopy;
2188 data += tocopy;
2189 blk++;
2190 }
2191 out:
2192 if (len == towrite) {
2193 mutex_unlock(&inode->i_mutex);
2194 return err;
2195 }
2196 if (inode->i_size < off + len - towrite)
2197 i_size_write(inode, off + len - towrite);
2198 inode->i_version++;
2199 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2200 mark_inode_dirty(inode);
2201 mutex_unlock(&inode->i_mutex);
2202 return len - towrite;
2203 }
2204
2205 #endif
2206
2207 static int get_super_block(struct file_system_type *fs_type,
2208 int flags, const char *dev_name,
2209 void *data, struct vfsmount *mnt)
2210 {
2211 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2212 mnt);
2213 }
2214
2215 static int __init init_reiserfs_fs(void)
2216 {
2217 int ret;
2218
2219 if ((ret = init_inodecache())) {
2220 return ret;
2221 }
2222
2223 reiserfs_proc_info_global_init();
2224
2225 ret = register_filesystem(&reiserfs_fs_type);
2226
2227 if (ret == 0) {
2228 return 0;
2229 }
2230
2231 reiserfs_proc_info_global_done();
2232 destroy_inodecache();
2233
2234 return ret;
2235 }
2236
2237 static void __exit exit_reiserfs_fs(void)
2238 {
2239 reiserfs_proc_info_global_done();
2240 unregister_filesystem(&reiserfs_fs_type);
2241 destroy_inodecache();
2242 }
2243
2244 struct file_system_type reiserfs_fs_type = {
2245 .owner = THIS_MODULE,
2246 .name = "reiserfs",
2247 .get_sb = get_super_block,
2248 .kill_sb = reiserfs_kill_sb,
2249 .fs_flags = FS_REQUIRES_DEV,
2250 };
2251
2252 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2253 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2254 MODULE_LICENSE("GPL");
2255
2256 module_init(init_reiserfs_fs);
2257 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree