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const: make struct super_block::s_qcop const
[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 lock_kernel();
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 kfree(s->s_fs_info);
503 s->s_fs_info = NULL;
504
505 unlock_kernel();
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 if (inode->i_sb->s_flags & MS_RDONLY) {
558 reiserfs_warning(inode->i_sb, "clm-6006",
559 "writing inode %lu on readonly FS",
560 inode->i_ino);
561 return;
562 }
563 reiserfs_write_lock(inode->i_sb);
564
565 /* this is really only used for atime updates, so they don't have
566 ** to be included in O_SYNC or fsync
567 */
568 err = journal_begin(&th, inode->i_sb, 1);
569 if (err) {
570 reiserfs_write_unlock(inode->i_sb);
571 return;
572 }
573 reiserfs_update_sd(&th, inode);
574 journal_end(&th, inode->i_sb, 1);
575 reiserfs_write_unlock(inode->i_sb);
576 }
577
578 #ifdef CONFIG_QUOTA
579 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
580 size_t, loff_t);
581 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
582 loff_t);
583 #endif
584
585 static const struct super_operations reiserfs_sops = {
586 .alloc_inode = reiserfs_alloc_inode,
587 .destroy_inode = reiserfs_destroy_inode,
588 .write_inode = reiserfs_write_inode,
589 .dirty_inode = reiserfs_dirty_inode,
590 .delete_inode = reiserfs_delete_inode,
591 .put_super = reiserfs_put_super,
592 .write_super = reiserfs_write_super,
593 .sync_fs = reiserfs_sync_fs,
594 .freeze_fs = reiserfs_freeze,
595 .unfreeze_fs = reiserfs_unfreeze,
596 .statfs = reiserfs_statfs,
597 .remount_fs = reiserfs_remount,
598 .show_options = generic_show_options,
599 #ifdef CONFIG_QUOTA
600 .quota_read = reiserfs_quota_read,
601 .quota_write = reiserfs_quota_write,
602 #endif
603 };
604
605 #ifdef CONFIG_QUOTA
606 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
607
608 static int reiserfs_write_dquot(struct dquot *);
609 static int reiserfs_acquire_dquot(struct dquot *);
610 static int reiserfs_release_dquot(struct dquot *);
611 static int reiserfs_mark_dquot_dirty(struct dquot *);
612 static int reiserfs_write_info(struct super_block *, int);
613 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
614
615 static const struct dquot_operations reiserfs_quota_operations = {
616 .initialize = dquot_initialize,
617 .drop = dquot_drop,
618 .alloc_space = dquot_alloc_space,
619 .alloc_inode = dquot_alloc_inode,
620 .free_space = dquot_free_space,
621 .free_inode = dquot_free_inode,
622 .transfer = dquot_transfer,
623 .write_dquot = reiserfs_write_dquot,
624 .acquire_dquot = reiserfs_acquire_dquot,
625 .release_dquot = reiserfs_release_dquot,
626 .mark_dirty = reiserfs_mark_dquot_dirty,
627 .write_info = reiserfs_write_info,
628 .alloc_dquot = dquot_alloc,
629 .destroy_dquot = dquot_destroy,
630 };
631
632 static const struct quotactl_ops reiserfs_qctl_operations = {
633 .quota_on = reiserfs_quota_on,
634 .quota_off = vfs_quota_off,
635 .quota_sync = vfs_quota_sync,
636 .get_info = vfs_get_dqinfo,
637 .set_info = vfs_set_dqinfo,
638 .get_dqblk = vfs_get_dqblk,
639 .set_dqblk = vfs_set_dqblk,
640 };
641 #endif
642
643 static const struct export_operations reiserfs_export_ops = {
644 .encode_fh = reiserfs_encode_fh,
645 .fh_to_dentry = reiserfs_fh_to_dentry,
646 .fh_to_parent = reiserfs_fh_to_parent,
647 .get_parent = reiserfs_get_parent,
648 };
649
650 /* this struct is used in reiserfs_getopt () for containing the value for those
651 mount options that have values rather than being toggles. */
652 typedef struct {
653 char *value;
654 int setmask; /* bitmask which is to set on mount_options bitmask when this
655 value is found, 0 is no bits are to be changed. */
656 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
657 value is found, 0 is no bits are to be changed. This is
658 applied BEFORE setmask */
659 } arg_desc_t;
660
661 /* Set this bit in arg_required to allow empty arguments */
662 #define REISERFS_OPT_ALLOWEMPTY 31
663
664 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
665 mount options */
666 typedef struct {
667 char *option_name;
668 int arg_required; /* 0 if argument is not required, not 0 otherwise */
669 const arg_desc_t *values; /* list of values accepted by an option */
670 int setmask; /* bitmask which is to set on mount_options bitmask when this
671 value is found, 0 is no bits are to be changed. */
672 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
673 value is found, 0 is no bits are to be changed. This is
674 applied BEFORE setmask */
675 } opt_desc_t;
676
677 /* possible values for -o data= */
678 static const arg_desc_t logging_mode[] = {
679 {"ordered", 1 << REISERFS_DATA_ORDERED,
680 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
681 {"journal", 1 << REISERFS_DATA_LOG,
682 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
683 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
684 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
685 {.value = NULL}
686 };
687
688 /* possible values for -o barrier= */
689 static const arg_desc_t barrier_mode[] = {
690 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
691 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
692 {.value = NULL}
693 };
694
695 /* possible values for "-o block-allocator=" and bits which are to be set in
696 s_mount_opt of reiserfs specific part of in-core super block */
697 static const arg_desc_t balloc[] = {
698 {"noborder", 1 << REISERFS_NO_BORDER, 0},
699 {"border", 0, 1 << REISERFS_NO_BORDER},
700 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
701 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
702 {"test4", 1 << REISERFS_TEST4, 0},
703 {"notest4", 0, 1 << REISERFS_TEST4},
704 {NULL, 0, 0}
705 };
706
707 static const arg_desc_t tails[] = {
708 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
709 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
710 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
711 {NULL, 0, 0}
712 };
713
714 static const arg_desc_t error_actions[] = {
715 {"panic", 1 << REISERFS_ERROR_PANIC,
716 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
717 {"ro-remount", 1 << REISERFS_ERROR_RO,
718 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
719 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
720 {"continue", 1 << REISERFS_ERROR_CONTINUE,
721 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
722 #endif
723 {NULL, 0, 0},
724 };
725
726 /* proceed only one option from a list *cur - string containing of mount options
727 opts - array of options which are accepted
728 opt_arg - if option is found and requires an argument and if it is specifed
729 in the input - pointer to the argument is stored here
730 bit_flags - if option requires to set a certain bit - it is set here
731 return -1 if unknown option is found, opt->arg_required otherwise */
732 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
733 char **opt_arg, unsigned long *bit_flags)
734 {
735 char *p;
736 /* foo=bar,
737 ^ ^ ^
738 | | +-- option_end
739 | +-- arg_start
740 +-- option_start
741 */
742 const opt_desc_t *opt;
743 const arg_desc_t *arg;
744
745 p = *cur;
746
747 /* assume argument cannot contain commas */
748 *cur = strchr(p, ',');
749 if (*cur) {
750 *(*cur) = '\0';
751 (*cur)++;
752 }
753
754 if (!strncmp(p, "alloc=", 6)) {
755 /* Ugly special case, probably we should redo options parser so that
756 it can understand several arguments for some options, also so that
757 it can fill several bitfields with option values. */
758 if (reiserfs_parse_alloc_options(s, p + 6)) {
759 return -1;
760 } else {
761 return 0;
762 }
763 }
764
765 /* for every option in the list */
766 for (opt = opts; opt->option_name; opt++) {
767 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
768 if (bit_flags) {
769 if (opt->clrmask ==
770 (1 << REISERFS_UNSUPPORTED_OPT))
771 reiserfs_warning(s, "super-6500",
772 "%s not supported.\n",
773 p);
774 else
775 *bit_flags &= ~opt->clrmask;
776 if (opt->setmask ==
777 (1 << REISERFS_UNSUPPORTED_OPT))
778 reiserfs_warning(s, "super-6501",
779 "%s not supported.\n",
780 p);
781 else
782 *bit_flags |= opt->setmask;
783 }
784 break;
785 }
786 }
787 if (!opt->option_name) {
788 reiserfs_warning(s, "super-6502",
789 "unknown mount option \"%s\"", p);
790 return -1;
791 }
792
793 p += strlen(opt->option_name);
794 switch (*p) {
795 case '=':
796 if (!opt->arg_required) {
797 reiserfs_warning(s, "super-6503",
798 "the option \"%s\" does not "
799 "require an argument\n",
800 opt->option_name);
801 return -1;
802 }
803 break;
804
805 case 0:
806 if (opt->arg_required) {
807 reiserfs_warning(s, "super-6504",
808 "the option \"%s\" requires an "
809 "argument\n", opt->option_name);
810 return -1;
811 }
812 break;
813 default:
814 reiserfs_warning(s, "super-6505",
815 "head of option \"%s\" is only correct\n",
816 opt->option_name);
817 return -1;
818 }
819
820 /* move to the argument, or to next option if argument is not required */
821 p++;
822
823 if (opt->arg_required
824 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
825 && !strlen(p)) {
826 /* this catches "option=," if not allowed */
827 reiserfs_warning(s, "super-6506",
828 "empty argument for \"%s\"\n",
829 opt->option_name);
830 return -1;
831 }
832
833 if (!opt->values) {
834 /* *=NULLopt_arg contains pointer to argument */
835 *opt_arg = p;
836 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
837 }
838
839 /* values possible for this option are listed in opt->values */
840 for (arg = opt->values; arg->value; arg++) {
841 if (!strcmp(p, arg->value)) {
842 if (bit_flags) {
843 *bit_flags &= ~arg->clrmask;
844 *bit_flags |= arg->setmask;
845 }
846 return opt->arg_required;
847 }
848 }
849
850 reiserfs_warning(s, "super-6506",
851 "bad value \"%s\" for option \"%s\"\n", p,
852 opt->option_name);
853 return -1;
854 }
855
856 /* returns 0 if something is wrong in option string, 1 - otherwise */
857 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
858 unsigned long *mount_options,
859 /* after the parsing phase, contains the
860 collection of bitflags defining what
861 mount options were selected. */
862 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
863 char **jdev_name,
864 unsigned int *commit_max_age,
865 char **qf_names,
866 unsigned int *qfmt)
867 {
868 int c;
869 char *arg = NULL;
870 char *pos;
871 opt_desc_t opts[] = {
872 /* Compatibility stuff, so that -o notail for old setups still work */
873 {"tails",.arg_required = 't',.values = tails},
874 {"notail",.clrmask =
875 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
876 {"conv",.setmask = 1 << REISERFS_CONVERT},
877 {"attrs",.setmask = 1 << REISERFS_ATTRS},
878 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
879 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
880 #ifdef CONFIG_REISERFS_FS_XATTR
881 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
882 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
883 #else
884 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
885 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
886 #endif
887 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
888 {"acl",.setmask = 1 << REISERFS_POSIXACL},
889 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
890 #else
891 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
892 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
893 #endif
894 {.option_name = "nolog"},
895 {"replayonly",.setmask = 1 << REPLAYONLY},
896 {"block-allocator",.arg_required = 'a',.values = balloc},
897 {"data",.arg_required = 'd',.values = logging_mode},
898 {"barrier",.arg_required = 'b',.values = barrier_mode},
899 {"resize",.arg_required = 'r',.values = NULL},
900 {"jdev",.arg_required = 'j',.values = NULL},
901 {"nolargeio",.arg_required = 'w',.values = NULL},
902 {"commit",.arg_required = 'c',.values = NULL},
903 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
904 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
905 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
906 {"errors",.arg_required = 'e',.values = error_actions},
907 {"usrjquota",.arg_required =
908 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
909 {"grpjquota",.arg_required =
910 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
911 {"jqfmt",.arg_required = 'f',.values = NULL},
912 {.option_name = NULL}
913 };
914
915 *blocks = 0;
916 if (!options || !*options)
917 /* use default configuration: create tails, journaling on, no
918 conversion to newest format */
919 return 1;
920
921 for (pos = options; pos;) {
922 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
923 if (c == -1)
924 /* wrong option is given */
925 return 0;
926
927 if (c == 'r') {
928 char *p;
929
930 p = NULL;
931 /* "resize=NNN" or "resize=auto" */
932
933 if (!strcmp(arg, "auto")) {
934 /* From JFS code, to auto-get the size. */
935 *blocks =
936 s->s_bdev->bd_inode->i_size >> s->
937 s_blocksize_bits;
938 } else {
939 *blocks = simple_strtoul(arg, &p, 0);
940 if (*p != '\0') {
941 /* NNN does not look like a number */
942 reiserfs_warning(s, "super-6507",
943 "bad value %s for "
944 "-oresize\n", arg);
945 return 0;
946 }
947 }
948 }
949
950 if (c == 'c') {
951 char *p = NULL;
952 unsigned long val = simple_strtoul(arg, &p, 0);
953 /* commit=NNN (time in seconds) */
954 if (*p != '\0' || val >= (unsigned int)-1) {
955 reiserfs_warning(s, "super-6508",
956 "bad value %s for -ocommit\n",
957 arg);
958 return 0;
959 }
960 *commit_max_age = (unsigned int)val;
961 }
962
963 if (c == 'w') {
964 reiserfs_warning(s, "super-6509", "nolargeio option "
965 "is no longer supported");
966 return 0;
967 }
968
969 if (c == 'j') {
970 if (arg && *arg && jdev_name) {
971 if (*jdev_name) { //Hm, already assigned?
972 reiserfs_warning(s, "super-6510",
973 "journal device was "
974 "already specified to "
975 "be %s", *jdev_name);
976 return 0;
977 }
978 *jdev_name = arg;
979 }
980 }
981 #ifdef CONFIG_QUOTA
982 if (c == 'u' || c == 'g') {
983 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
984
985 if (sb_any_quota_loaded(s) &&
986 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
987 reiserfs_warning(s, "super-6511",
988 "cannot change journaled "
989 "quota options when quota "
990 "turned on.");
991 return 0;
992 }
993 if (*arg) { /* Some filename specified? */
994 if (REISERFS_SB(s)->s_qf_names[qtype]
995 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
996 arg)) {
997 reiserfs_warning(s, "super-6512",
998 "%s quota file "
999 "already specified.",
1000 QTYPE2NAME(qtype));
1001 return 0;
1002 }
1003 if (strchr(arg, '/')) {
1004 reiserfs_warning(s, "super-6513",
1005 "quotafile must be "
1006 "on filesystem root.");
1007 return 0;
1008 }
1009 qf_names[qtype] =
1010 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1011 if (!qf_names[qtype]) {
1012 reiserfs_warning(s, "reiserfs-2502",
1013 "not enough memory "
1014 "for storing "
1015 "quotafile name.");
1016 return 0;
1017 }
1018 strcpy(qf_names[qtype], arg);
1019 *mount_options |= 1 << REISERFS_QUOTA;
1020 } else {
1021 if (qf_names[qtype] !=
1022 REISERFS_SB(s)->s_qf_names[qtype])
1023 kfree(qf_names[qtype]);
1024 qf_names[qtype] = NULL;
1025 }
1026 }
1027 if (c == 'f') {
1028 if (!strcmp(arg, "vfsold"))
1029 *qfmt = QFMT_VFS_OLD;
1030 else if (!strcmp(arg, "vfsv0"))
1031 *qfmt = QFMT_VFS_V0;
1032 else {
1033 reiserfs_warning(s, "super-6514",
1034 "unknown quota format "
1035 "specified.");
1036 return 0;
1037 }
1038 if (sb_any_quota_loaded(s) &&
1039 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1040 reiserfs_warning(s, "super-6515",
1041 "cannot change journaled "
1042 "quota options when quota "
1043 "turned on.");
1044 return 0;
1045 }
1046 }
1047 #else
1048 if (c == 'u' || c == 'g' || c == 'f') {
1049 reiserfs_warning(s, "reiserfs-2503", "journaled "
1050 "quota options not supported.");
1051 return 0;
1052 }
1053 #endif
1054 }
1055
1056 #ifdef CONFIG_QUOTA
1057 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1058 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1059 reiserfs_warning(s, "super-6515",
1060 "journaled quota format not specified.");
1061 return 0;
1062 }
1063 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1064 if (!(*mount_options & (1 << REISERFS_QUOTA))
1065 && sb_any_quota_loaded(s)) {
1066 reiserfs_warning(s, "super-6516", "quota options must "
1067 "be present when quota is turned on.");
1068 return 0;
1069 }
1070 #endif
1071
1072 return 1;
1073 }
1074
1075 static void switch_data_mode(struct super_block *s, unsigned long mode)
1076 {
1077 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1078 (1 << REISERFS_DATA_ORDERED) |
1079 (1 << REISERFS_DATA_WRITEBACK));
1080 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1081 }
1082
1083 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1084 {
1085 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1086 if (!reiserfs_data_log(s)) {
1087 switch_data_mode(s, REISERFS_DATA_LOG);
1088 reiserfs_info(s, "switching to journaled data mode\n");
1089 }
1090 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1091 if (!reiserfs_data_ordered(s)) {
1092 switch_data_mode(s, REISERFS_DATA_ORDERED);
1093 reiserfs_info(s, "switching to ordered data mode\n");
1094 }
1095 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1096 if (!reiserfs_data_writeback(s)) {
1097 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1098 reiserfs_info(s, "switching to writeback data mode\n");
1099 }
1100 }
1101 }
1102
1103 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1104 {
1105 int flush = (1 << REISERFS_BARRIER_FLUSH);
1106 int none = (1 << REISERFS_BARRIER_NONE);
1107 int all_barrier = flush | none;
1108
1109 if (bits & all_barrier) {
1110 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1111 if (bits & flush) {
1112 REISERFS_SB(s)->s_mount_opt |= flush;
1113 printk("reiserfs: enabling write barrier flush mode\n");
1114 } else if (bits & none) {
1115 REISERFS_SB(s)->s_mount_opt |= none;
1116 printk("reiserfs: write barriers turned off\n");
1117 }
1118 }
1119 }
1120
1121 static void handle_attrs(struct super_block *s)
1122 {
1123 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1124
1125 if (reiserfs_attrs(s)) {
1126 if (old_format_only(s)) {
1127 reiserfs_warning(s, "super-6517", "cannot support "
1128 "attributes on 3.5.x disk format");
1129 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1130 return;
1131 }
1132 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1133 reiserfs_warning(s, "super-6518", "cannot support "
1134 "attributes until flag is set in "
1135 "super-block");
1136 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1137 }
1138 }
1139 }
1140
1141 #ifdef CONFIG_QUOTA
1142 static void handle_quota_files(struct super_block *s, char **qf_names,
1143 unsigned int *qfmt)
1144 {
1145 int i;
1146
1147 for (i = 0; i < MAXQUOTAS; i++) {
1148 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1149 kfree(REISERFS_SB(s)->s_qf_names[i]);
1150 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1151 }
1152 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1153 }
1154 #endif
1155
1156 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1157 {
1158 struct reiserfs_super_block *rs;
1159 struct reiserfs_transaction_handle th;
1160 unsigned long blocks;
1161 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1162 unsigned long safe_mask = 0;
1163 unsigned int commit_max_age = (unsigned int)-1;
1164 struct reiserfs_journal *journal = SB_JOURNAL(s);
1165 char *new_opts = kstrdup(arg, GFP_KERNEL);
1166 int err;
1167 char *qf_names[MAXQUOTAS];
1168 unsigned int qfmt = 0;
1169 #ifdef CONFIG_QUOTA
1170 int i;
1171
1172 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1173 #endif
1174
1175 lock_kernel();
1176 rs = SB_DISK_SUPER_BLOCK(s);
1177
1178 if (!reiserfs_parse_options
1179 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1180 qf_names, &qfmt)) {
1181 #ifdef CONFIG_QUOTA
1182 for (i = 0; i < MAXQUOTAS; i++)
1183 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1184 kfree(qf_names[i]);
1185 #endif
1186 err = -EINVAL;
1187 goto out_err;
1188 }
1189 #ifdef CONFIG_QUOTA
1190 handle_quota_files(s, qf_names, &qfmt);
1191 #endif
1192
1193 handle_attrs(s);
1194
1195 /* Add options that are safe here */
1196 safe_mask |= 1 << REISERFS_SMALLTAIL;
1197 safe_mask |= 1 << REISERFS_LARGETAIL;
1198 safe_mask |= 1 << REISERFS_NO_BORDER;
1199 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1200 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1201 safe_mask |= 1 << REISERFS_TEST4;
1202 safe_mask |= 1 << REISERFS_ATTRS;
1203 safe_mask |= 1 << REISERFS_XATTRS_USER;
1204 safe_mask |= 1 << REISERFS_POSIXACL;
1205 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1206 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1207 safe_mask |= 1 << REISERFS_ERROR_RO;
1208 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1209 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1210 safe_mask |= 1 << REISERFS_QUOTA;
1211
1212 /* Update the bitmask, taking care to keep
1213 * the bits we're not allowed to change here */
1214 REISERFS_SB(s)->s_mount_opt =
1215 (REISERFS_SB(s)->
1216 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1217
1218 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1219 journal->j_max_commit_age = commit_max_age;
1220 journal->j_max_trans_age = commit_max_age;
1221 } else if (commit_max_age == 0) {
1222 /* 0 means restore defaults. */
1223 journal->j_max_commit_age = journal->j_default_max_commit_age;
1224 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1225 }
1226
1227 if (blocks) {
1228 err = reiserfs_resize(s, blocks);
1229 if (err != 0)
1230 goto out_err;
1231 }
1232
1233 if (*mount_flags & MS_RDONLY) {
1234 reiserfs_xattr_init(s, *mount_flags);
1235 /* remount read-only */
1236 if (s->s_flags & MS_RDONLY)
1237 /* it is read-only already */
1238 goto out_ok;
1239 /* try to remount file system with read-only permissions */
1240 if (sb_umount_state(rs) == REISERFS_VALID_FS
1241 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1242 goto out_ok;
1243 }
1244
1245 err = journal_begin(&th, s, 10);
1246 if (err)
1247 goto out_err;
1248
1249 /* Mounting a rw partition read-only. */
1250 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1251 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1252 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1253 } else {
1254 /* remount read-write */
1255 if (!(s->s_flags & MS_RDONLY)) {
1256 reiserfs_xattr_init(s, *mount_flags);
1257 goto out_ok; /* We are read-write already */
1258 }
1259
1260 if (reiserfs_is_journal_aborted(journal)) {
1261 err = journal->j_errno;
1262 goto out_err;
1263 }
1264
1265 handle_data_mode(s, mount_options);
1266 handle_barrier_mode(s, mount_options);
1267 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1268 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1269 err = journal_begin(&th, s, 10);
1270 if (err)
1271 goto out_err;
1272
1273 /* Mount a partition which is read-only, read-write */
1274 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1275 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1276 s->s_flags &= ~MS_RDONLY;
1277 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1278 if (!old_format_only(s))
1279 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1280 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1281 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1282 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1283 }
1284 /* this will force a full flush of all journal lists */
1285 SB_JOURNAL(s)->j_must_wait = 1;
1286 err = journal_end(&th, s, 10);
1287 if (err)
1288 goto out_err;
1289 s->s_dirt = 0;
1290
1291 if (!(*mount_flags & MS_RDONLY)) {
1292 finish_unfinished(s);
1293 reiserfs_xattr_init(s, *mount_flags);
1294 }
1295
1296 out_ok:
1297 replace_mount_options(s, new_opts);
1298 unlock_kernel();
1299 return 0;
1300
1301 out_err:
1302 kfree(new_opts);
1303 unlock_kernel();
1304 return err;
1305 }
1306
1307 static int read_super_block(struct super_block *s, int offset)
1308 {
1309 struct buffer_head *bh;
1310 struct reiserfs_super_block *rs;
1311 int fs_blocksize;
1312
1313 bh = sb_bread(s, offset / s->s_blocksize);
1314 if (!bh) {
1315 reiserfs_warning(s, "sh-2006",
1316 "bread failed (dev %s, block %lu, size %lu)",
1317 reiserfs_bdevname(s), offset / s->s_blocksize,
1318 s->s_blocksize);
1319 return 1;
1320 }
1321
1322 rs = (struct reiserfs_super_block *)bh->b_data;
1323 if (!is_any_reiserfs_magic_string(rs)) {
1324 brelse(bh);
1325 return 1;
1326 }
1327 //
1328 // ok, reiserfs signature (old or new) found in at the given offset
1329 //
1330 fs_blocksize = sb_blocksize(rs);
1331 brelse(bh);
1332 sb_set_blocksize(s, fs_blocksize);
1333
1334 bh = sb_bread(s, offset / s->s_blocksize);
1335 if (!bh) {
1336 reiserfs_warning(s, "sh-2007",
1337 "bread failed (dev %s, block %lu, size %lu)",
1338 reiserfs_bdevname(s), offset / s->s_blocksize,
1339 s->s_blocksize);
1340 return 1;
1341 }
1342
1343 rs = (struct reiserfs_super_block *)bh->b_data;
1344 if (sb_blocksize(rs) != s->s_blocksize) {
1345 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1346 "filesystem on (dev %s, block %Lu, size %lu)",
1347 reiserfs_bdevname(s),
1348 (unsigned long long)bh->b_blocknr,
1349 s->s_blocksize);
1350 brelse(bh);
1351 return 1;
1352 }
1353
1354 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1355 brelse(bh);
1356 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1357 "--rebuild-tree run detected. Please run\n"
1358 "reiserfsck --rebuild-tree and wait for a "
1359 "completion. If that fails\n"
1360 "get newer reiserfsprogs package");
1361 return 1;
1362 }
1363
1364 SB_BUFFER_WITH_SB(s) = bh;
1365 SB_DISK_SUPER_BLOCK(s) = rs;
1366
1367 if (is_reiserfs_jr(rs)) {
1368 /* magic is of non-standard journal filesystem, look at s_version to
1369 find which format is in use */
1370 if (sb_version(rs) == REISERFS_VERSION_2)
1371 reiserfs_info(s, "found reiserfs format \"3.6\""
1372 " with non-standard journal\n");
1373 else if (sb_version(rs) == REISERFS_VERSION_1)
1374 reiserfs_info(s, "found reiserfs format \"3.5\""
1375 " with non-standard journal\n");
1376 else {
1377 reiserfs_warning(s, "sh-2012", "found unknown "
1378 "format \"%u\" of reiserfs with "
1379 "non-standard magic", sb_version(rs));
1380 return 1;
1381 }
1382 } else
1383 /* s_version of standard format may contain incorrect information,
1384 so we just look at the magic string */
1385 reiserfs_info(s,
1386 "found reiserfs format \"%s\" with standard journal\n",
1387 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1388
1389 s->s_op = &reiserfs_sops;
1390 s->s_export_op = &reiserfs_export_ops;
1391 #ifdef CONFIG_QUOTA
1392 s->s_qcop = &reiserfs_qctl_operations;
1393 s->dq_op = &reiserfs_quota_operations;
1394 #endif
1395
1396 /* new format is limited by the 32 bit wide i_blocks field, want to
1397 ** be one full block below that.
1398 */
1399 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1400 return 0;
1401 }
1402
1403 /* after journal replay, reread all bitmap and super blocks */
1404 static int reread_meta_blocks(struct super_block *s)
1405 {
1406 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1407 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1408 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1409 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1410 return 1;
1411 }
1412
1413 return 0;
1414 }
1415
1416 /////////////////////////////////////////////////////
1417 // hash detection stuff
1418
1419 // if root directory is empty - we set default - Yura's - hash and
1420 // warn about it
1421 // FIXME: we look for only one name in a directory. If tea and yura
1422 // bith have the same value - we ask user to send report to the
1423 // mailing list
1424 static __u32 find_hash_out(struct super_block *s)
1425 {
1426 int retval;
1427 struct inode *inode;
1428 struct cpu_key key;
1429 INITIALIZE_PATH(path);
1430 struct reiserfs_dir_entry de;
1431 __u32 hash = DEFAULT_HASH;
1432
1433 inode = s->s_root->d_inode;
1434
1435 do { // Some serious "goto"-hater was there ;)
1436 u32 teahash, r5hash, yurahash;
1437
1438 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1439 retval = search_by_entry_key(s, &key, &path, &de);
1440 if (retval == IO_ERROR) {
1441 pathrelse(&path);
1442 return UNSET_HASH;
1443 }
1444 if (retval == NAME_NOT_FOUND)
1445 de.de_entry_num--;
1446 set_de_name_and_namelen(&de);
1447 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1448 /* allow override in this case */
1449 if (reiserfs_rupasov_hash(s)) {
1450 hash = YURA_HASH;
1451 }
1452 reiserfs_info(s, "FS seems to be empty, autodetect "
1453 "is using the default hash\n");
1454 break;
1455 }
1456 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1457 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1458 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1459 if (((teahash == r5hash)
1460 &&
1461 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1462 == r5hash)) || ((teahash == yurahash)
1463 && (yurahash ==
1464 GET_HASH_VALUE(deh_offset
1465 (&
1466 (de.
1467 de_deh[de.
1468 de_entry_num])))))
1469 || ((r5hash == yurahash)
1470 && (yurahash ==
1471 GET_HASH_VALUE(deh_offset
1472 (&(de.de_deh[de.de_entry_num])))))) {
1473 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1474 "automatically detect hash function. "
1475 "Please mount with -o "
1476 "hash={tea,rupasov,r5}");
1477 hash = UNSET_HASH;
1478 break;
1479 }
1480 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1481 yurahash)
1482 hash = YURA_HASH;
1483 else if (GET_HASH_VALUE
1484 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1485 hash = TEA_HASH;
1486 else if (GET_HASH_VALUE
1487 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1488 hash = R5_HASH;
1489 else {
1490 reiserfs_warning(s, "reiserfs-2506",
1491 "Unrecognised hash function");
1492 hash = UNSET_HASH;
1493 }
1494 } while (0);
1495
1496 pathrelse(&path);
1497 return hash;
1498 }
1499
1500 // finds out which hash names are sorted with
1501 static int what_hash(struct super_block *s)
1502 {
1503 __u32 code;
1504
1505 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1506
1507 /* reiserfs_hash_detect() == true if any of the hash mount options
1508 ** were used. We must check them to make sure the user isn't
1509 ** using a bad hash value
1510 */
1511 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1512 code = find_hash_out(s);
1513
1514 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1515 /* detection has found the hash, and we must check against the
1516 ** mount options
1517 */
1518 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1519 reiserfs_warning(s, "reiserfs-2507",
1520 "Error, %s hash detected, "
1521 "unable to force rupasov hash",
1522 reiserfs_hashname(code));
1523 code = UNSET_HASH;
1524 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1525 reiserfs_warning(s, "reiserfs-2508",
1526 "Error, %s hash detected, "
1527 "unable to force tea hash",
1528 reiserfs_hashname(code));
1529 code = UNSET_HASH;
1530 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1531 reiserfs_warning(s, "reiserfs-2509",
1532 "Error, %s hash detected, "
1533 "unable to force r5 hash",
1534 reiserfs_hashname(code));
1535 code = UNSET_HASH;
1536 }
1537 } else {
1538 /* find_hash_out was not called or could not determine the hash */
1539 if (reiserfs_rupasov_hash(s)) {
1540 code = YURA_HASH;
1541 } else if (reiserfs_tea_hash(s)) {
1542 code = TEA_HASH;
1543 } else if (reiserfs_r5_hash(s)) {
1544 code = R5_HASH;
1545 }
1546 }
1547
1548 /* if we are mounted RW, and we have a new valid hash code, update
1549 ** the super
1550 */
1551 if (code != UNSET_HASH &&
1552 !(s->s_flags & MS_RDONLY) &&
1553 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1554 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1555 }
1556 return code;
1557 }
1558
1559 // return pointer to appropriate function
1560 static hashf_t hash_function(struct super_block *s)
1561 {
1562 switch (what_hash(s)) {
1563 case TEA_HASH:
1564 reiserfs_info(s, "Using tea hash to sort names\n");
1565 return keyed_hash;
1566 case YURA_HASH:
1567 reiserfs_info(s, "Using rupasov hash to sort names\n");
1568 return yura_hash;
1569 case R5_HASH:
1570 reiserfs_info(s, "Using r5 hash to sort names\n");
1571 return r5_hash;
1572 }
1573 return NULL;
1574 }
1575
1576 // this is used to set up correct value for old partitions
1577 static int function2code(hashf_t func)
1578 {
1579 if (func == keyed_hash)
1580 return TEA_HASH;
1581 if (func == yura_hash)
1582 return YURA_HASH;
1583 if (func == r5_hash)
1584 return R5_HASH;
1585
1586 BUG(); // should never happen
1587
1588 return 0;
1589 }
1590
1591 #define SWARN(silent, s, id, ...) \
1592 if (!(silent)) \
1593 reiserfs_warning(s, id, __VA_ARGS__)
1594
1595 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1596 {
1597 struct inode *root_inode;
1598 struct reiserfs_transaction_handle th;
1599 int old_format = 0;
1600 unsigned long blocks;
1601 unsigned int commit_max_age = 0;
1602 int jinit_done = 0;
1603 struct reiserfs_iget_args args;
1604 struct reiserfs_super_block *rs;
1605 char *jdev_name;
1606 struct reiserfs_sb_info *sbi;
1607 int errval = -EINVAL;
1608 char *qf_names[MAXQUOTAS] = {};
1609 unsigned int qfmt = 0;
1610
1611 save_mount_options(s, data);
1612
1613 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1614 if (!sbi) {
1615 errval = -ENOMEM;
1616 goto error;
1617 }
1618 s->s_fs_info = sbi;
1619 /* Set default values for options: non-aggressive tails, RO on errors */
1620 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1621 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1622 /* no preallocation minimum, be smart in
1623 reiserfs_file_write instead */
1624 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1625 /* Preallocate by 16 blocks (17-1) at once */
1626 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1627 /* setup default block allocator options */
1628 reiserfs_init_alloc_options(s);
1629
1630 jdev_name = NULL;
1631 if (reiserfs_parse_options
1632 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1633 &commit_max_age, qf_names, &qfmt) == 0) {
1634 goto error;
1635 }
1636 #ifdef CONFIG_QUOTA
1637 handle_quota_files(s, qf_names, &qfmt);
1638 #endif
1639
1640 if (blocks) {
1641 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1642 goto error;
1643 }
1644
1645 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1646 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1647 old_format = 1;
1648 /* try new format (64-th 1k block), which can contain reiserfs super block */
1649 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1650 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1651 reiserfs_bdevname(s));
1652 goto error;
1653 }
1654
1655 rs = SB_DISK_SUPER_BLOCK(s);
1656 /* Let's do basic sanity check to verify that underlying device is not
1657 smaller than the filesystem. If the check fails then abort and scream,
1658 because bad stuff will happen otherwise. */
1659 if (s->s_bdev && s->s_bdev->bd_inode
1660 && i_size_read(s->s_bdev->bd_inode) <
1661 sb_block_count(rs) * sb_blocksize(rs)) {
1662 SWARN(silent, s, "", "Filesystem cannot be "
1663 "mounted because it is bigger than the device");
1664 SWARN(silent, s, "", "You may need to run fsck "
1665 "or increase size of your LVM partition");
1666 SWARN(silent, s, "", "Or may be you forgot to "
1667 "reboot after fdisk when it told you to");
1668 goto error;
1669 }
1670
1671 sbi->s_mount_state = SB_REISERFS_STATE(s);
1672 sbi->s_mount_state = REISERFS_VALID_FS;
1673
1674 if ((errval = reiserfs_init_bitmap_cache(s))) {
1675 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1676 goto error;
1677 }
1678 errval = -EINVAL;
1679 #ifdef CONFIG_REISERFS_CHECK
1680 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1681 SWARN(silent, s, "", "- it is slow mode for debugging.");
1682 #endif
1683
1684 /* make data=ordered the default */
1685 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1686 !reiserfs_data_writeback(s)) {
1687 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1688 }
1689
1690 if (reiserfs_data_log(s)) {
1691 reiserfs_info(s, "using journaled data mode\n");
1692 } else if (reiserfs_data_ordered(s)) {
1693 reiserfs_info(s, "using ordered data mode\n");
1694 } else {
1695 reiserfs_info(s, "using writeback data mode\n");
1696 }
1697 if (reiserfs_barrier_flush(s)) {
1698 printk("reiserfs: using flush barriers\n");
1699 }
1700 // set_device_ro(s->s_dev, 1) ;
1701 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1702 SWARN(silent, s, "sh-2022",
1703 "unable to initialize journal space");
1704 goto error;
1705 } else {
1706 jinit_done = 1; /* once this is set, journal_release must be called
1707 ** if we error out of the mount
1708 */
1709 }
1710 if (reread_meta_blocks(s)) {
1711 SWARN(silent, s, "jmacd-9",
1712 "unable to reread meta blocks after journal init");
1713 goto error;
1714 }
1715
1716 if (replay_only(s))
1717 goto error;
1718
1719 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1720 SWARN(silent, s, "clm-7000",
1721 "Detected readonly device, marking FS readonly");
1722 s->s_flags |= MS_RDONLY;
1723 }
1724 args.objectid = REISERFS_ROOT_OBJECTID;
1725 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1726 root_inode =
1727 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1728 reiserfs_init_locked_inode, (void *)(&args));
1729 if (!root_inode) {
1730 SWARN(silent, s, "jmacd-10", "get root inode failed");
1731 goto error;
1732 }
1733
1734 if (root_inode->i_state & I_NEW) {
1735 reiserfs_read_locked_inode(root_inode, &args);
1736 unlock_new_inode(root_inode);
1737 }
1738
1739 s->s_root = d_alloc_root(root_inode);
1740 if (!s->s_root) {
1741 iput(root_inode);
1742 goto error;
1743 }
1744 // define and initialize hash function
1745 sbi->s_hash_function = hash_function(s);
1746 if (sbi->s_hash_function == NULL) {
1747 dput(s->s_root);
1748 s->s_root = NULL;
1749 goto error;
1750 }
1751
1752 if (is_reiserfs_3_5(rs)
1753 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1754 set_bit(REISERFS_3_5, &(sbi->s_properties));
1755 else if (old_format)
1756 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1757 else
1758 set_bit(REISERFS_3_6, &(sbi->s_properties));
1759
1760 if (!(s->s_flags & MS_RDONLY)) {
1761
1762 errval = journal_begin(&th, s, 1);
1763 if (errval) {
1764 dput(s->s_root);
1765 s->s_root = NULL;
1766 goto error;
1767 }
1768 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1769
1770 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1771 set_sb_fs_state(rs, 0);
1772
1773 /* Clear out s_bmap_nr if it would wrap. We can handle this
1774 * case, but older revisions can't. This will cause the
1775 * file system to fail mount on those older implementations,
1776 * avoiding corruption. -jeffm */
1777 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1778 sb_bmap_nr(rs) != 0) {
1779 reiserfs_warning(s, "super-2030", "This file system "
1780 "claims to use %u bitmap blocks in "
1781 "its super block, but requires %u. "
1782 "Clearing to zero.", sb_bmap_nr(rs),
1783 reiserfs_bmap_count(s));
1784
1785 set_sb_bmap_nr(rs, 0);
1786 }
1787
1788 if (old_format_only(s)) {
1789 /* filesystem of format 3.5 either with standard or non-standard
1790 journal */
1791 if (convert_reiserfs(s)) {
1792 /* and -o conv is given */
1793 if (!silent)
1794 reiserfs_info(s,
1795 "converting 3.5 filesystem to the 3.6 format");
1796
1797 if (is_reiserfs_3_5(rs))
1798 /* put magic string of 3.6 format. 2.2 will not be able to
1799 mount this filesystem anymore */
1800 memcpy(rs->s_v1.s_magic,
1801 reiserfs_3_6_magic_string,
1802 sizeof
1803 (reiserfs_3_6_magic_string));
1804
1805 set_sb_version(rs, REISERFS_VERSION_2);
1806 reiserfs_convert_objectid_map_v1(s);
1807 set_bit(REISERFS_3_6, &(sbi->s_properties));
1808 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1809 } else if (!silent) {
1810 reiserfs_info(s, "using 3.5.x disk format\n");
1811 }
1812 } else
1813 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1814
1815
1816 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1817 errval = journal_end(&th, s, 1);
1818 if (errval) {
1819 dput(s->s_root);
1820 s->s_root = NULL;
1821 goto error;
1822 }
1823
1824 if ((errval = reiserfs_lookup_privroot(s)) ||
1825 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1826 dput(s->s_root);
1827 s->s_root = NULL;
1828 goto error;
1829 }
1830
1831 /* look for files which were to be removed in previous session */
1832 finish_unfinished(s);
1833 } else {
1834 if (old_format_only(s) && !silent) {
1835 reiserfs_info(s, "using 3.5.x disk format\n");
1836 }
1837
1838 if ((errval = reiserfs_lookup_privroot(s)) ||
1839 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1840 dput(s->s_root);
1841 s->s_root = NULL;
1842 goto error;
1843 }
1844 }
1845 // mark hash in super block: it could be unset. overwrite should be ok
1846 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1847
1848 handle_attrs(s);
1849
1850 reiserfs_proc_info_init(s);
1851
1852 init_waitqueue_head(&(sbi->s_wait));
1853 spin_lock_init(&sbi->bitmap_lock);
1854
1855 return (0);
1856
1857 error:
1858 if (jinit_done) { /* kill the commit thread, free journal ram */
1859 journal_release_error(NULL, s);
1860 }
1861
1862 reiserfs_free_bitmap_cache(s);
1863 if (SB_BUFFER_WITH_SB(s))
1864 brelse(SB_BUFFER_WITH_SB(s));
1865 #ifdef CONFIG_QUOTA
1866 {
1867 int j;
1868 for (j = 0; j < MAXQUOTAS; j++)
1869 kfree(qf_names[j]);
1870 }
1871 #endif
1872 kfree(sbi);
1873
1874 s->s_fs_info = NULL;
1875 return errval;
1876 }
1877
1878 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1879 {
1880 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1881
1882 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1883 buf->f_bfree = sb_free_blocks(rs);
1884 buf->f_bavail = buf->f_bfree;
1885 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1886 buf->f_bsize = dentry->d_sb->s_blocksize;
1887 /* changed to accommodate gcc folks. */
1888 buf->f_type = REISERFS_SUPER_MAGIC;
1889 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1890 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1891 sizeof(rs->s_uuid)/2);
1892
1893 return 0;
1894 }
1895
1896 #ifdef CONFIG_QUOTA
1897 static int reiserfs_write_dquot(struct dquot *dquot)
1898 {
1899 struct reiserfs_transaction_handle th;
1900 int ret, err;
1901
1902 reiserfs_write_lock(dquot->dq_sb);
1903 ret =
1904 journal_begin(&th, dquot->dq_sb,
1905 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1906 if (ret)
1907 goto out;
1908 ret = dquot_commit(dquot);
1909 err =
1910 journal_end(&th, dquot->dq_sb,
1911 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1912 if (!ret && err)
1913 ret = err;
1914 out:
1915 reiserfs_write_unlock(dquot->dq_sb);
1916 return ret;
1917 }
1918
1919 static int reiserfs_acquire_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_INIT_BLOCKS(dquot->dq_sb));
1928 if (ret)
1929 goto out;
1930 ret = dquot_acquire(dquot);
1931 err =
1932 journal_end(&th, dquot->dq_sb,
1933 REISERFS_QUOTA_INIT_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_release_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_DEL_BLOCKS(dquot->dq_sb));
1950 if (ret) {
1951 /* Release dquot anyway to avoid endless cycle in dqput() */
1952 dquot_release(dquot);
1953 goto out;
1954 }
1955 ret = dquot_release(dquot);
1956 err =
1957 journal_end(&th, dquot->dq_sb,
1958 REISERFS_QUOTA_DEL_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_mark_dquot_dirty(struct dquot *dquot)
1967 {
1968 /* Are we journaling quotas? */
1969 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1970 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1971 dquot_mark_dquot_dirty(dquot);
1972 return reiserfs_write_dquot(dquot);
1973 } else
1974 return dquot_mark_dquot_dirty(dquot);
1975 }
1976
1977 static int reiserfs_write_info(struct super_block *sb, int type)
1978 {
1979 struct reiserfs_transaction_handle th;
1980 int ret, err;
1981
1982 /* Data block + inode block */
1983 reiserfs_write_lock(sb);
1984 ret = journal_begin(&th, sb, 2);
1985 if (ret)
1986 goto out;
1987 ret = dquot_commit_info(sb, type);
1988 err = journal_end(&th, sb, 2);
1989 if (!ret && err)
1990 ret = err;
1991 out:
1992 reiserfs_write_unlock(sb);
1993 return ret;
1994 }
1995
1996 /*
1997 * Turn on quotas during mount time - we need to find the quota file and such...
1998 */
1999 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2000 {
2001 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2002 REISERFS_SB(sb)->s_jquota_fmt, type);
2003 }
2004
2005 /*
2006 * Standard function to be called on quota_on
2007 */
2008 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2009 char *name, int remount)
2010 {
2011 int err;
2012 struct path path;
2013 struct inode *inode;
2014 struct reiserfs_transaction_handle th;
2015
2016 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2017 return -EINVAL;
2018 /* No more checks needed? Path and format_id are bogus anyway... */
2019 if (remount)
2020 return vfs_quota_on(sb, type, format_id, name, 1);
2021 err = kern_path(name, LOOKUP_FOLLOW, &path);
2022 if (err)
2023 return err;
2024 /* Quotafile not on the same filesystem? */
2025 if (path.mnt->mnt_sb != sb) {
2026 err = -EXDEV;
2027 goto out;
2028 }
2029 inode = path.dentry->d_inode;
2030 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2031 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2032 err = reiserfs_unpack(inode, NULL);
2033 if (err) {
2034 reiserfs_warning(sb, "super-6520",
2035 "Unpacking tail of quota file failed"
2036 " (%d). Cannot turn on quotas.", err);
2037 err = -EINVAL;
2038 goto out;
2039 }
2040 mark_inode_dirty(inode);
2041 }
2042 /* Journaling quota? */
2043 if (REISERFS_SB(sb)->s_qf_names[type]) {
2044 /* Quotafile not of fs root? */
2045 if (path.dentry->d_parent != sb->s_root)
2046 reiserfs_warning(sb, "super-6521",
2047 "Quota file not on filesystem root. "
2048 "Journalled quota will not work.");
2049 }
2050
2051 /*
2052 * When we journal data on quota file, we have to flush journal to see
2053 * all updates to the file when we bypass pagecache...
2054 */
2055 if (reiserfs_file_data_log(inode)) {
2056 /* Just start temporary transaction and finish it */
2057 err = journal_begin(&th, sb, 1);
2058 if (err)
2059 goto out;
2060 err = journal_end_sync(&th, sb, 1);
2061 if (err)
2062 goto out;
2063 }
2064 err = vfs_quota_on_path(sb, type, format_id, &path);
2065 out:
2066 path_put(&path);
2067 return err;
2068 }
2069
2070 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2071 * acquiring the locks... As quota files are never truncated and quota code
2072 * itself serializes the operations (and noone else should touch the files)
2073 * we don't have to be afraid of races */
2074 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2075 size_t len, loff_t off)
2076 {
2077 struct inode *inode = sb_dqopt(sb)->files[type];
2078 unsigned long blk = off >> sb->s_blocksize_bits;
2079 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2080 size_t toread;
2081 struct buffer_head tmp_bh, *bh;
2082 loff_t i_size = i_size_read(inode);
2083
2084 if (off > i_size)
2085 return 0;
2086 if (off + len > i_size)
2087 len = i_size - off;
2088 toread = len;
2089 while (toread > 0) {
2090 tocopy =
2091 sb->s_blocksize - offset <
2092 toread ? sb->s_blocksize - offset : toread;
2093 tmp_bh.b_state = 0;
2094 /* Quota files are without tails so we can safely use this function */
2095 reiserfs_write_lock(sb);
2096 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2097 reiserfs_write_unlock(sb);
2098 if (err)
2099 return err;
2100 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2101 memset(data, 0, tocopy);
2102 else {
2103 bh = sb_bread(sb, tmp_bh.b_blocknr);
2104 if (!bh)
2105 return -EIO;
2106 memcpy(data, bh->b_data + offset, tocopy);
2107 brelse(bh);
2108 }
2109 offset = 0;
2110 toread -= tocopy;
2111 data += tocopy;
2112 blk++;
2113 }
2114 return len;
2115 }
2116
2117 /* Write to quotafile (we know the transaction is already started and has
2118 * enough credits) */
2119 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2120 const char *data, size_t len, loff_t off)
2121 {
2122 struct inode *inode = sb_dqopt(sb)->files[type];
2123 unsigned long blk = off >> sb->s_blocksize_bits;
2124 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2125 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2126 size_t towrite = len;
2127 struct buffer_head tmp_bh, *bh;
2128
2129 if (!current->journal_info) {
2130 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2131 " cancelled because transaction is not started.\n",
2132 (unsigned long long)off, (unsigned long long)len);
2133 return -EIO;
2134 }
2135 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2136 while (towrite > 0) {
2137 tocopy = sb->s_blocksize - offset < towrite ?
2138 sb->s_blocksize - offset : towrite;
2139 tmp_bh.b_state = 0;
2140 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2141 if (err)
2142 goto out;
2143 if (offset || tocopy != sb->s_blocksize)
2144 bh = sb_bread(sb, tmp_bh.b_blocknr);
2145 else
2146 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2147 if (!bh) {
2148 err = -EIO;
2149 goto out;
2150 }
2151 lock_buffer(bh);
2152 memcpy(bh->b_data + offset, data, tocopy);
2153 flush_dcache_page(bh->b_page);
2154 set_buffer_uptodate(bh);
2155 unlock_buffer(bh);
2156 reiserfs_prepare_for_journal(sb, bh, 1);
2157 journal_mark_dirty(current->journal_info, sb, bh);
2158 if (!journal_quota)
2159 reiserfs_add_ordered_list(inode, bh);
2160 brelse(bh);
2161 offset = 0;
2162 towrite -= tocopy;
2163 data += tocopy;
2164 blk++;
2165 }
2166 out:
2167 if (len == towrite) {
2168 mutex_unlock(&inode->i_mutex);
2169 return err;
2170 }
2171 if (inode->i_size < off + len - towrite)
2172 i_size_write(inode, off + len - towrite);
2173 inode->i_version++;
2174 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2175 mark_inode_dirty(inode);
2176 mutex_unlock(&inode->i_mutex);
2177 return len - towrite;
2178 }
2179
2180 #endif
2181
2182 static int get_super_block(struct file_system_type *fs_type,
2183 int flags, const char *dev_name,
2184 void *data, struct vfsmount *mnt)
2185 {
2186 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2187 mnt);
2188 }
2189
2190 static int __init init_reiserfs_fs(void)
2191 {
2192 int ret;
2193
2194 if ((ret = init_inodecache())) {
2195 return ret;
2196 }
2197
2198 reiserfs_proc_info_global_init();
2199 reiserfs_proc_register_global("version",
2200 reiserfs_global_version_in_proc);
2201
2202 ret = register_filesystem(&reiserfs_fs_type);
2203
2204 if (ret == 0) {
2205 return 0;
2206 }
2207
2208 reiserfs_proc_unregister_global("version");
2209 reiserfs_proc_info_global_done();
2210 destroy_inodecache();
2211
2212 return ret;
2213 }
2214
2215 static void __exit exit_reiserfs_fs(void)
2216 {
2217 reiserfs_proc_unregister_global("version");
2218 reiserfs_proc_info_global_done();
2219 unregister_filesystem(&reiserfs_fs_type);
2220 destroy_inodecache();
2221 }
2222
2223 struct file_system_type reiserfs_fs_type = {
2224 .owner = THIS_MODULE,
2225 .name = "reiserfs",
2226 .get_sb = get_super_block,
2227 .kill_sb = reiserfs_kill_sb,
2228 .fs_flags = FS_REQUIRES_DEV,
2229 };
2230
2231 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2232 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2233 MODULE_LICENSE("GPL");
2234
2235 module_init(init_reiserfs_fs);
2236 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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