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pdc202xx_old: fix resetproc() method
[linux-2.6/mini2440.git] / fs / reiserfs / super.c
blob0ae6486d90462ae4b644611fbd7baa221af8db57
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/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.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 if (!(s->s_flags & MS_RDONLY)) {
68 struct reiserfs_transaction_handle th;
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 } else {
77 s->s_dirt = 0;
78 }
79 return 0;
80 }
81
82 static void reiserfs_write_super(struct super_block *s)
83 {
84 reiserfs_sync_fs(s, 1);
85 }
86
87 static int reiserfs_freeze(struct super_block *s)
88 {
89 struct reiserfs_transaction_handle th;
90 reiserfs_write_lock(s);
91 if (!(s->s_flags & MS_RDONLY)) {
92 int err = journal_begin(&th, s, 1);
93 if (err) {
94 reiserfs_block_writes(&th);
95 } else {
96 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
97 1);
98 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
99 reiserfs_block_writes(&th);
100 journal_end_sync(&th, s, 1);
101 }
102 }
103 s->s_dirt = 0;
104 reiserfs_write_unlock(s);
105 return 0;
106 }
107
108 static int reiserfs_unfreeze(struct super_block *s)
109 {
110 reiserfs_allow_writes(s);
111 return 0;
112 }
113
114 extern const struct in_core_key MAX_IN_CORE_KEY;
115
116 /* this is used to delete "save link" when there are no items of a
117 file it points to. It can either happen if unlink is completed but
118 "save unlink" removal, or if file has both unlink and truncate
119 pending and as unlink completes first (because key of "save link"
120 protecting unlink is bigger that a key lf "save link" which
121 protects truncate), so there left no items to make truncate
122 completion on */
123 static int remove_save_link_only(struct super_block *s,
124 struct reiserfs_key *key, int oid_free)
125 {
126 struct reiserfs_transaction_handle th;
127 int err;
128
129 /* we are going to do one balancing */
130 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
131 if (err)
132 return err;
133
134 reiserfs_delete_solid_item(&th, NULL, key);
135 if (oid_free)
136 /* removals are protected by direct items */
137 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
138
139 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
140 }
141
142 #ifdef CONFIG_QUOTA
143 static int reiserfs_quota_on_mount(struct super_block *, int);
144 #endif
145
146 /* look for uncompleted unlinks and truncates and complete them */
147 static int finish_unfinished(struct super_block *s)
148 {
149 INITIALIZE_PATH(path);
150 struct cpu_key max_cpu_key, obj_key;
151 struct reiserfs_key save_link_key, last_inode_key;
152 int retval = 0;
153 struct item_head *ih;
154 struct buffer_head *bh;
155 int item_pos;
156 char *item;
157 int done;
158 struct inode *inode;
159 int truncate;
160 #ifdef CONFIG_QUOTA
161 int i;
162 int ms_active_set;
163 #endif
164
165 /* compose key to look for "save" links */
166 max_cpu_key.version = KEY_FORMAT_3_5;
167 max_cpu_key.on_disk_key.k_dir_id = ~0U;
168 max_cpu_key.on_disk_key.k_objectid = ~0U;
169 set_cpu_key_k_offset(&max_cpu_key, ~0U);
170 max_cpu_key.key_length = 3;
171
172 memset(&last_inode_key, 0, sizeof(last_inode_key));
173
174 #ifdef CONFIG_QUOTA
175 /* Needed for iput() to work correctly and not trash data */
176 if (s->s_flags & MS_ACTIVE) {
177 ms_active_set = 0;
178 } else {
179 ms_active_set = 1;
180 s->s_flags |= MS_ACTIVE;
181 }
182 /* Turn on quotas so that they are updated correctly */
183 for (i = 0; i < MAXQUOTAS; i++) {
184 if (REISERFS_SB(s)->s_qf_names[i]) {
185 int ret = reiserfs_quota_on_mount(s, i);
186 if (ret < 0)
187 reiserfs_warning(s, "reiserfs-2500",
188 "cannot turn on journaled "
189 "quota: error %d", ret);
190 }
191 }
192 #endif
193
194 done = 0;
195 REISERFS_SB(s)->s_is_unlinked_ok = 1;
196 while (!retval) {
197 retval = search_item(s, &max_cpu_key, &path);
198 if (retval != ITEM_NOT_FOUND) {
199 reiserfs_error(s, "vs-2140",
200 "search_by_key returned %d", retval);
201 break;
202 }
203
204 bh = get_last_bh(&path);
205 item_pos = get_item_pos(&path);
206 if (item_pos != B_NR_ITEMS(bh)) {
207 reiserfs_warning(s, "vs-2060",
208 "wrong position found");
209 break;
210 }
211 item_pos--;
212 ih = B_N_PITEM_HEAD(bh, item_pos);
213
214 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
215 /* there are no "save" links anymore */
216 break;
217
218 save_link_key = ih->ih_key;
219 if (is_indirect_le_ih(ih))
220 truncate = 1;
221 else
222 truncate = 0;
223
224 /* reiserfs_iget needs k_dirid and k_objectid only */
225 item = B_I_PITEM(bh, ih);
226 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
227 obj_key.on_disk_key.k_objectid =
228 le32_to_cpu(ih->ih_key.k_objectid);
229 obj_key.on_disk_key.k_offset = 0;
230 obj_key.on_disk_key.k_type = 0;
231
232 pathrelse(&path);
233
234 inode = reiserfs_iget(s, &obj_key);
235 if (!inode) {
236 /* the unlink almost completed, it just did not manage to remove
237 "save" link and release objectid */
238 reiserfs_warning(s, "vs-2180", "iget failed for %K",
239 &obj_key);
240 retval = remove_save_link_only(s, &save_link_key, 1);
241 continue;
242 }
243
244 if (!truncate && inode->i_nlink) {
245 /* file is not unlinked */
246 reiserfs_warning(s, "vs-2185",
247 "file %K is not unlinked",
248 &obj_key);
249 retval = remove_save_link_only(s, &save_link_key, 0);
250 continue;
251 }
252 vfs_dq_init(inode);
253
254 if (truncate && S_ISDIR(inode->i_mode)) {
255 /* We got a truncate request for a dir which is impossible.
256 The only imaginable way is to execute unfinished truncate request
257 then boot into old kernel, remove the file and create dir with
258 the same key. */
259 reiserfs_warning(s, "green-2101",
260 "impossible truncate on a "
261 "directory %k. Please report",
262 INODE_PKEY(inode));
263 retval = remove_save_link_only(s, &save_link_key, 0);
264 truncate = 0;
265 iput(inode);
266 continue;
267 }
268
269 if (truncate) {
270 REISERFS_I(inode)->i_flags |=
271 i_link_saved_truncate_mask;
272 /* not completed truncate found. New size was committed together
273 with "save" link */
274 reiserfs_info(s, "Truncating %k to %Ld ..",
275 INODE_PKEY(inode), inode->i_size);
276 reiserfs_truncate_file(inode,
277 0
278 /*don't update modification time */
279 );
280 retval = remove_save_link(inode, truncate);
281 } else {
282 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
283 /* not completed unlink (rmdir) found */
284 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
285 if (memcmp(&last_inode_key, INODE_PKEY(inode),
286 sizeof(last_inode_key))){
287 last_inode_key = *INODE_PKEY(inode);
288 /* removal gets completed in iput */
289 retval = 0;
290 } else {
291 reiserfs_warning(s, "super-2189", "Dead loop "
292 "in finish_unfinished "
293 "detected, just remove "
294 "save link\n");
295 retval = remove_save_link_only(s,
296 &save_link_key, 0);
297 }
298 }
299
300 iput(inode);
301 printk("done\n");
302 done++;
303 }
304 REISERFS_SB(s)->s_is_unlinked_ok = 0;
305
306 #ifdef CONFIG_QUOTA
307 /* Turn quotas off */
308 for (i = 0; i < MAXQUOTAS; i++) {
309 if (sb_dqopt(s)->files[i])
310 vfs_quota_off(s, i, 0);
311 }
312 if (ms_active_set)
313 /* Restore the flag back */
314 s->s_flags &= ~MS_ACTIVE;
315 #endif
316 pathrelse(&path);
317 if (done)
318 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
319 "Completed\n", done);
320 return retval;
321 }
322
323 /* to protect file being unlinked from getting lost we "safe" link files
324 being unlinked. This link will be deleted in the same transaction with last
325 item of file. mounting the filesystem we scan all these links and remove
326 files which almost got lost */
327 void add_save_link(struct reiserfs_transaction_handle *th,
328 struct inode *inode, int truncate)
329 {
330 INITIALIZE_PATH(path);
331 int retval;
332 struct cpu_key key;
333 struct item_head ih;
334 __le32 link;
335
336 BUG_ON(!th->t_trans_id);
337
338 /* file can only get one "save link" of each kind */
339 RFALSE(truncate &&
340 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
341 "saved link already exists for truncated inode %lx",
342 (long)inode->i_ino);
343 RFALSE(!truncate &&
344 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
345 "saved link already exists for unlinked inode %lx",
346 (long)inode->i_ino);
347
348 /* setup key of "save" link */
349 key.version = KEY_FORMAT_3_5;
350 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
351 key.on_disk_key.k_objectid = inode->i_ino;
352 if (!truncate) {
353 /* unlink, rmdir, rename */
354 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
355 set_cpu_key_k_type(&key, TYPE_DIRECT);
356
357 /* item head of "safe" link */
358 make_le_item_head(&ih, &key, key.version,
359 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
360 4 /*length */ , 0xffff /*free space */ );
361 } else {
362 /* truncate */
363 if (S_ISDIR(inode->i_mode))
364 reiserfs_warning(inode->i_sb, "green-2102",
365 "Adding a truncate savelink for "
366 "a directory %k! Please report",
367 INODE_PKEY(inode));
368 set_cpu_key_k_offset(&key, 1);
369 set_cpu_key_k_type(&key, TYPE_INDIRECT);
370
371 /* item head of "safe" link */
372 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
373 4 /*length */ , 0 /*free space */ );
374 }
375 key.key_length = 3;
376
377 /* look for its place in the tree */
378 retval = search_item(inode->i_sb, &key, &path);
379 if (retval != ITEM_NOT_FOUND) {
380 if (retval != -ENOSPC)
381 reiserfs_error(inode->i_sb, "vs-2100",
382 "search_by_key (%K) returned %d", &key,
383 retval);
384 pathrelse(&path);
385 return;
386 }
387
388 /* body of "save" link */
389 link = INODE_PKEY(inode)->k_dir_id;
390
391 /* put "save" link inot tree, don't charge quota to anyone */
392 retval =
393 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
394 if (retval) {
395 if (retval != -ENOSPC)
396 reiserfs_error(inode->i_sb, "vs-2120",
397 "insert_item returned %d", retval);
398 } else {
399 if (truncate)
400 REISERFS_I(inode)->i_flags |=
401 i_link_saved_truncate_mask;
402 else
403 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
404 }
405 }
406
407 /* this opens transaction unlike add_save_link */
408 int remove_save_link(struct inode *inode, int truncate)
409 {
410 struct reiserfs_transaction_handle th;
411 struct reiserfs_key key;
412 int err;
413
414 /* we are going to do one balancing only */
415 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
416 if (err)
417 return err;
418
419 /* setup key of "save" link */
420 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
421 key.k_objectid = INODE_PKEY(inode)->k_objectid;
422 if (!truncate) {
423 /* unlink, rmdir, rename */
424 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
425 1 + inode->i_sb->s_blocksize);
426 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
427 } else {
428 /* truncate */
429 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
430 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
431 }
432
433 if ((truncate &&
434 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
435 (!truncate &&
436 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
437 /* don't take quota bytes from anywhere */
438 reiserfs_delete_solid_item(&th, NULL, &key);
439 if (!truncate) {
440 reiserfs_release_objectid(&th, inode->i_ino);
441 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
442 } else
443 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
444
445 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
446 }
447
448 static void reiserfs_kill_sb(struct super_block *s)
449 {
450 if (REISERFS_SB(s)) {
451 #ifdef CONFIG_REISERFS_FS_XATTR
452 if (REISERFS_SB(s)->xattr_root) {
453 d_invalidate(REISERFS_SB(s)->xattr_root);
454 dput(REISERFS_SB(s)->xattr_root);
455 REISERFS_SB(s)->xattr_root = NULL;
456 }
457 #endif
458 if (REISERFS_SB(s)->priv_root) {
459 d_invalidate(REISERFS_SB(s)->priv_root);
460 dput(REISERFS_SB(s)->priv_root);
461 REISERFS_SB(s)->priv_root = NULL;
462 }
463 }
464
465 kill_block_super(s);
466 }
467
468 static void reiserfs_put_super(struct super_block *s)
469 {
470 struct reiserfs_transaction_handle th;
471 th.t_trans_id = 0;
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 return;
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 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
532 ei->i_acl_access = NULL;
533 ei->i_acl_default = NULL;
534 #endif
535 }
536
537 static int init_inodecache(void)
538 {
539 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
540 sizeof(struct
541 reiserfs_inode_info),
542 0, (SLAB_RECLAIM_ACCOUNT|
543 SLAB_MEM_SPREAD),
544 init_once);
545 if (reiserfs_inode_cachep == NULL)
546 return -ENOMEM;
547 return 0;
548 }
549
550 static void destroy_inodecache(void)
551 {
552 kmem_cache_destroy(reiserfs_inode_cachep);
553 }
554
555 /* we don't mark inodes dirty, we just log them */
556 static void reiserfs_dirty_inode(struct inode *inode)
557 {
558 struct reiserfs_transaction_handle th;
559
560 int err = 0;
561 if (inode->i_sb->s_flags & MS_RDONLY) {
562 reiserfs_warning(inode->i_sb, "clm-6006",
563 "writing inode %lu on readonly FS",
564 inode->i_ino);
565 return;
566 }
567 reiserfs_write_lock(inode->i_sb);
568
569 /* this is really only used for atime updates, so they don't have
570 ** to be included in O_SYNC or fsync
571 */
572 err = journal_begin(&th, inode->i_sb, 1);
573 if (err) {
574 reiserfs_write_unlock(inode->i_sb);
575 return;
576 }
577 reiserfs_update_sd(&th, inode);
578 journal_end(&th, inode->i_sb, 1);
579 reiserfs_write_unlock(inode->i_sb);
580 }
581
582 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
583 static void reiserfs_clear_inode(struct inode *inode)
584 {
585 struct posix_acl *acl;
586
587 acl = REISERFS_I(inode)->i_acl_access;
588 if (acl && !IS_ERR(acl))
589 posix_acl_release(acl);
590 REISERFS_I(inode)->i_acl_access = NULL;
591
592 acl = REISERFS_I(inode)->i_acl_default;
593 if (acl && !IS_ERR(acl))
594 posix_acl_release(acl);
595 REISERFS_I(inode)->i_acl_default = NULL;
596 }
597 #else
598 #define reiserfs_clear_inode NULL
599 #endif
600
601 #ifdef CONFIG_QUOTA
602 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
603 size_t, loff_t);
604 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
605 loff_t);
606 #endif
607
608 static const struct super_operations reiserfs_sops = {
609 .alloc_inode = reiserfs_alloc_inode,
610 .destroy_inode = reiserfs_destroy_inode,
611 .write_inode = reiserfs_write_inode,
612 .dirty_inode = reiserfs_dirty_inode,
613 .delete_inode = reiserfs_delete_inode,
614 .clear_inode = reiserfs_clear_inode,
615 .put_super = reiserfs_put_super,
616 .write_super = reiserfs_write_super,
617 .sync_fs = reiserfs_sync_fs,
618 .freeze_fs = reiserfs_freeze,
619 .unfreeze_fs = reiserfs_unfreeze,
620 .statfs = reiserfs_statfs,
621 .remount_fs = reiserfs_remount,
622 .show_options = generic_show_options,
623 #ifdef CONFIG_QUOTA
624 .quota_read = reiserfs_quota_read,
625 .quota_write = reiserfs_quota_write,
626 #endif
627 };
628
629 #ifdef CONFIG_QUOTA
630 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
631
632 static int reiserfs_write_dquot(struct dquot *);
633 static int reiserfs_acquire_dquot(struct dquot *);
634 static int reiserfs_release_dquot(struct dquot *);
635 static int reiserfs_mark_dquot_dirty(struct dquot *);
636 static int reiserfs_write_info(struct super_block *, int);
637 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
638
639 static struct dquot_operations reiserfs_quota_operations = {
640 .initialize = dquot_initialize,
641 .drop = dquot_drop,
642 .alloc_space = dquot_alloc_space,
643 .alloc_inode = dquot_alloc_inode,
644 .free_space = dquot_free_space,
645 .free_inode = dquot_free_inode,
646 .transfer = dquot_transfer,
647 .write_dquot = reiserfs_write_dquot,
648 .acquire_dquot = reiserfs_acquire_dquot,
649 .release_dquot = reiserfs_release_dquot,
650 .mark_dirty = reiserfs_mark_dquot_dirty,
651 .write_info = reiserfs_write_info,
652 .alloc_dquot = dquot_alloc,
653 .destroy_dquot = dquot_destroy,
654 };
655
656 static struct quotactl_ops reiserfs_qctl_operations = {
657 .quota_on = reiserfs_quota_on,
658 .quota_off = vfs_quota_off,
659 .quota_sync = vfs_quota_sync,
660 .get_info = vfs_get_dqinfo,
661 .set_info = vfs_set_dqinfo,
662 .get_dqblk = vfs_get_dqblk,
663 .set_dqblk = vfs_set_dqblk,
664 };
665 #endif
666
667 static const struct export_operations reiserfs_export_ops = {
668 .encode_fh = reiserfs_encode_fh,
669 .fh_to_dentry = reiserfs_fh_to_dentry,
670 .fh_to_parent = reiserfs_fh_to_parent,
671 .get_parent = reiserfs_get_parent,
672 };
673
674 /* this struct is used in reiserfs_getopt () for containing the value for those
675 mount options that have values rather than being toggles. */
676 typedef struct {
677 char *value;
678 int setmask; /* bitmask which is to set on mount_options bitmask when this
679 value is found, 0 is no bits are to be changed. */
680 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
681 value is found, 0 is no bits are to be changed. This is
682 applied BEFORE setmask */
683 } arg_desc_t;
684
685 /* Set this bit in arg_required to allow empty arguments */
686 #define REISERFS_OPT_ALLOWEMPTY 31
687
688 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
689 mount options */
690 typedef struct {
691 char *option_name;
692 int arg_required; /* 0 if argument is not required, not 0 otherwise */
693 const arg_desc_t *values; /* list of values accepted by an option */
694 int setmask; /* bitmask which is to set on mount_options bitmask when this
695 value is found, 0 is no bits are to be changed. */
696 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
697 value is found, 0 is no bits are to be changed. This is
698 applied BEFORE setmask */
699 } opt_desc_t;
700
701 /* possible values for -o data= */
702 static const arg_desc_t logging_mode[] = {
703 {"ordered", 1 << REISERFS_DATA_ORDERED,
704 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
705 {"journal", 1 << REISERFS_DATA_LOG,
706 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
707 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
708 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
709 {.value = NULL}
710 };
711
712 /* possible values for -o barrier= */
713 static const arg_desc_t barrier_mode[] = {
714 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
715 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
716 {.value = NULL}
717 };
718
719 /* possible values for "-o block-allocator=" and bits which are to be set in
720 s_mount_opt of reiserfs specific part of in-core super block */
721 static const arg_desc_t balloc[] = {
722 {"noborder", 1 << REISERFS_NO_BORDER, 0},
723 {"border", 0, 1 << REISERFS_NO_BORDER},
724 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
725 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
726 {"test4", 1 << REISERFS_TEST4, 0},
727 {"notest4", 0, 1 << REISERFS_TEST4},
728 {NULL, 0, 0}
729 };
730
731 static const arg_desc_t tails[] = {
732 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
733 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
734 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
735 {NULL, 0, 0}
736 };
737
738 static const arg_desc_t error_actions[] = {
739 {"panic", 1 << REISERFS_ERROR_PANIC,
740 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
741 {"ro-remount", 1 << REISERFS_ERROR_RO,
742 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
743 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
744 {"continue", 1 << REISERFS_ERROR_CONTINUE,
745 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
746 #endif
747 {NULL, 0, 0},
748 };
749
750 /* proceed only one option from a list *cur - string containing of mount options
751 opts - array of options which are accepted
752 opt_arg - if option is found and requires an argument and if it is specifed
753 in the input - pointer to the argument is stored here
754 bit_flags - if option requires to set a certain bit - it is set here
755 return -1 if unknown option is found, opt->arg_required otherwise */
756 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
757 char **opt_arg, unsigned long *bit_flags)
758 {
759 char *p;
760 /* foo=bar,
761 ^ ^ ^
762 | | +-- option_end
763 | +-- arg_start
764 +-- option_start
765 */
766 const opt_desc_t *opt;
767 const arg_desc_t *arg;
768
769 p = *cur;
770
771 /* assume argument cannot contain commas */
772 *cur = strchr(p, ',');
773 if (*cur) {
774 *(*cur) = '\0';
775 (*cur)++;
776 }
777
778 if (!strncmp(p, "alloc=", 6)) {
779 /* Ugly special case, probably we should redo options parser so that
780 it can understand several arguments for some options, also so that
781 it can fill several bitfields with option values. */
782 if (reiserfs_parse_alloc_options(s, p + 6)) {
783 return -1;
784 } else {
785 return 0;
786 }
787 }
788
789 /* for every option in the list */
790 for (opt = opts; opt->option_name; opt++) {
791 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
792 if (bit_flags) {
793 if (opt->clrmask ==
794 (1 << REISERFS_UNSUPPORTED_OPT))
795 reiserfs_warning(s, "super-6500",
796 "%s not supported.\n",
797 p);
798 else
799 *bit_flags &= ~opt->clrmask;
800 if (opt->setmask ==
801 (1 << REISERFS_UNSUPPORTED_OPT))
802 reiserfs_warning(s, "super-6501",
803 "%s not supported.\n",
804 p);
805 else
806 *bit_flags |= opt->setmask;
807 }
808 break;
809 }
810 }
811 if (!opt->option_name) {
812 reiserfs_warning(s, "super-6502",
813 "unknown mount option \"%s\"", p);
814 return -1;
815 }
816
817 p += strlen(opt->option_name);
818 switch (*p) {
819 case '=':
820 if (!opt->arg_required) {
821 reiserfs_warning(s, "super-6503",
822 "the option \"%s\" does not "
823 "require an argument\n",
824 opt->option_name);
825 return -1;
826 }
827 break;
828
829 case 0:
830 if (opt->arg_required) {
831 reiserfs_warning(s, "super-6504",
832 "the option \"%s\" requires an "
833 "argument\n", opt->option_name);
834 return -1;
835 }
836 break;
837 default:
838 reiserfs_warning(s, "super-6505",
839 "head of option \"%s\" is only correct\n",
840 opt->option_name);
841 return -1;
842 }
843
844 /* move to the argument, or to next option if argument is not required */
845 p++;
846
847 if (opt->arg_required
848 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
849 && !strlen(p)) {
850 /* this catches "option=," if not allowed */
851 reiserfs_warning(s, "super-6506",
852 "empty argument for \"%s\"\n",
853 opt->option_name);
854 return -1;
855 }
856
857 if (!opt->values) {
858 /* *=NULLopt_arg contains pointer to argument */
859 *opt_arg = p;
860 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
861 }
862
863 /* values possible for this option are listed in opt->values */
864 for (arg = opt->values; arg->value; arg++) {
865 if (!strcmp(p, arg->value)) {
866 if (bit_flags) {
867 *bit_flags &= ~arg->clrmask;
868 *bit_flags |= arg->setmask;
869 }
870 return opt->arg_required;
871 }
872 }
873
874 reiserfs_warning(s, "super-6506",
875 "bad value \"%s\" for option \"%s\"\n", p,
876 opt->option_name);
877 return -1;
878 }
879
880 /* returns 0 if something is wrong in option string, 1 - otherwise */
881 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
882 unsigned long *mount_options,
883 /* after the parsing phase, contains the
884 collection of bitflags defining what
885 mount options were selected. */
886 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
887 char **jdev_name,
888 unsigned int *commit_max_age,
889 char **qf_names,
890 unsigned int *qfmt)
891 {
892 int c;
893 char *arg = NULL;
894 char *pos;
895 opt_desc_t opts[] = {
896 /* Compatibility stuff, so that -o notail for old setups still work */
897 {"tails",.arg_required = 't',.values = tails},
898 {"notail",.clrmask =
899 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
900 {"conv",.setmask = 1 << REISERFS_CONVERT},
901 {"attrs",.setmask = 1 << REISERFS_ATTRS},
902 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
903 #ifdef CONFIG_REISERFS_FS_XATTR
904 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
905 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
906 #else
907 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
909 #endif
910 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
911 {"acl",.setmask = 1 << REISERFS_POSIXACL},
912 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
913 #else
914 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
915 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
916 #endif
917 {.option_name = "nolog"},
918 {"replayonly",.setmask = 1 << REPLAYONLY},
919 {"block-allocator",.arg_required = 'a',.values = balloc},
920 {"data",.arg_required = 'd',.values = logging_mode},
921 {"barrier",.arg_required = 'b',.values = barrier_mode},
922 {"resize",.arg_required = 'r',.values = NULL},
923 {"jdev",.arg_required = 'j',.values = NULL},
924 {"nolargeio",.arg_required = 'w',.values = NULL},
925 {"commit",.arg_required = 'c',.values = NULL},
926 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
927 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
928 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
929 {"errors",.arg_required = 'e',.values = error_actions},
930 {"usrjquota",.arg_required =
931 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
932 {"grpjquota",.arg_required =
933 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
934 {"jqfmt",.arg_required = 'f',.values = NULL},
935 {.option_name = NULL}
936 };
937
938 *blocks = 0;
939 if (!options || !*options)
940 /* use default configuration: create tails, journaling on, no
941 conversion to newest format */
942 return 1;
943
944 for (pos = options; pos;) {
945 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
946 if (c == -1)
947 /* wrong option is given */
948 return 0;
949
950 if (c == 'r') {
951 char *p;
952
953 p = NULL;
954 /* "resize=NNN" or "resize=auto" */
955
956 if (!strcmp(arg, "auto")) {
957 /* From JFS code, to auto-get the size. */
958 *blocks =
959 s->s_bdev->bd_inode->i_size >> s->
960 s_blocksize_bits;
961 } else {
962 *blocks = simple_strtoul(arg, &p, 0);
963 if (*p != '\0') {
964 /* NNN does not look like a number */
965 reiserfs_warning(s, "super-6507",
966 "bad value %s for "
967 "-oresize\n", arg);
968 return 0;
969 }
970 }
971 }
972
973 if (c == 'c') {
974 char *p = NULL;
975 unsigned long val = simple_strtoul(arg, &p, 0);
976 /* commit=NNN (time in seconds) */
977 if (*p != '\0' || val >= (unsigned int)-1) {
978 reiserfs_warning(s, "super-6508",
979 "bad value %s for -ocommit\n",
980 arg);
981 return 0;
982 }
983 *commit_max_age = (unsigned int)val;
984 }
985
986 if (c == 'w') {
987 reiserfs_warning(s, "super-6509", "nolargeio option "
988 "is no longer supported");
989 return 0;
990 }
991
992 if (c == 'j') {
993 if (arg && *arg && jdev_name) {
994 if (*jdev_name) { //Hm, already assigned?
995 reiserfs_warning(s, "super-6510",
996 "journal device was "
997 "already specified to "
998 "be %s", *jdev_name);
999 return 0;
1000 }
1001 *jdev_name = arg;
1002 }
1003 }
1004 #ifdef CONFIG_QUOTA
1005 if (c == 'u' || c == 'g') {
1006 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1007
1008 if (sb_any_quota_loaded(s) &&
1009 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1010 reiserfs_warning(s, "super-6511",
1011 "cannot change journaled "
1012 "quota options when quota "
1013 "turned on.");
1014 return 0;
1015 }
1016 if (*arg) { /* Some filename specified? */
1017 if (REISERFS_SB(s)->s_qf_names[qtype]
1018 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1019 arg)) {
1020 reiserfs_warning(s, "super-6512",
1021 "%s quota file "
1022 "already specified.",
1023 QTYPE2NAME(qtype));
1024 return 0;
1025 }
1026 if (strchr(arg, '/')) {
1027 reiserfs_warning(s, "super-6513",
1028 "quotafile must be "
1029 "on filesystem root.");
1030 return 0;
1031 }
1032 qf_names[qtype] =
1033 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1034 if (!qf_names[qtype]) {
1035 reiserfs_warning(s, "reiserfs-2502",
1036 "not enough memory "
1037 "for storing "
1038 "quotafile name.");
1039 return 0;
1040 }
1041 strcpy(qf_names[qtype], arg);
1042 *mount_options |= 1 << REISERFS_QUOTA;
1043 } else {
1044 if (qf_names[qtype] !=
1045 REISERFS_SB(s)->s_qf_names[qtype])
1046 kfree(qf_names[qtype]);
1047 qf_names[qtype] = NULL;
1048 }
1049 }
1050 if (c == 'f') {
1051 if (!strcmp(arg, "vfsold"))
1052 *qfmt = QFMT_VFS_OLD;
1053 else if (!strcmp(arg, "vfsv0"))
1054 *qfmt = QFMT_VFS_V0;
1055 else {
1056 reiserfs_warning(s, "super-6514",
1057 "unknown quota format "
1058 "specified.");
1059 return 0;
1060 }
1061 if (sb_any_quota_loaded(s) &&
1062 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1063 reiserfs_warning(s, "super-6515",
1064 "cannot change journaled "
1065 "quota options when quota "
1066 "turned on.");
1067 return 0;
1068 }
1069 }
1070 #else
1071 if (c == 'u' || c == 'g' || c == 'f') {
1072 reiserfs_warning(s, "reiserfs-2503", "journaled "
1073 "quota options not supported.");
1074 return 0;
1075 }
1076 #endif
1077 }
1078
1079 #ifdef CONFIG_QUOTA
1080 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1081 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1082 reiserfs_warning(s, "super-6515",
1083 "journaled quota format not specified.");
1084 return 0;
1085 }
1086 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1087 if (!(*mount_options & (1 << REISERFS_QUOTA))
1088 && sb_any_quota_loaded(s)) {
1089 reiserfs_warning(s, "super-6516", "quota options must "
1090 "be present when quota is turned on.");
1091 return 0;
1092 }
1093 #endif
1094
1095 return 1;
1096 }
1097
1098 static void switch_data_mode(struct super_block *s, unsigned long mode)
1099 {
1100 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1101 (1 << REISERFS_DATA_ORDERED) |
1102 (1 << REISERFS_DATA_WRITEBACK));
1103 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1104 }
1105
1106 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1107 {
1108 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1109 if (!reiserfs_data_log(s)) {
1110 switch_data_mode(s, REISERFS_DATA_LOG);
1111 reiserfs_info(s, "switching to journaled data mode\n");
1112 }
1113 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1114 if (!reiserfs_data_ordered(s)) {
1115 switch_data_mode(s, REISERFS_DATA_ORDERED);
1116 reiserfs_info(s, "switching to ordered data mode\n");
1117 }
1118 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1119 if (!reiserfs_data_writeback(s)) {
1120 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1121 reiserfs_info(s, "switching to writeback data mode\n");
1122 }
1123 }
1124 }
1125
1126 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1127 {
1128 int flush = (1 << REISERFS_BARRIER_FLUSH);
1129 int none = (1 << REISERFS_BARRIER_NONE);
1130 int all_barrier = flush | none;
1131
1132 if (bits & all_barrier) {
1133 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1134 if (bits & flush) {
1135 REISERFS_SB(s)->s_mount_opt |= flush;
1136 printk("reiserfs: enabling write barrier flush mode\n");
1137 } else if (bits & none) {
1138 REISERFS_SB(s)->s_mount_opt |= none;
1139 printk("reiserfs: write barriers turned off\n");
1140 }
1141 }
1142 }
1143
1144 static void handle_attrs(struct super_block *s)
1145 {
1146 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1147
1148 if (reiserfs_attrs(s)) {
1149 if (old_format_only(s)) {
1150 reiserfs_warning(s, "super-6517", "cannot support "
1151 "attributes on 3.5.x disk format");
1152 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1153 return;
1154 }
1155 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1156 reiserfs_warning(s, "super-6518", "cannot support "
1157 "attributes until flag is set in "
1158 "super-block");
1159 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1160 }
1161 }
1162 }
1163
1164 #ifdef CONFIG_QUOTA
1165 static void handle_quota_files(struct super_block *s, char **qf_names,
1166 unsigned int *qfmt)
1167 {
1168 int i;
1169
1170 for (i = 0; i < MAXQUOTAS; i++) {
1171 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1172 kfree(REISERFS_SB(s)->s_qf_names[i]);
1173 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1174 }
1175 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1176 }
1177 #endif
1178
1179 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1180 {
1181 struct reiserfs_super_block *rs;
1182 struct reiserfs_transaction_handle th;
1183 unsigned long blocks;
1184 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1185 unsigned long safe_mask = 0;
1186 unsigned int commit_max_age = (unsigned int)-1;
1187 struct reiserfs_journal *journal = SB_JOURNAL(s);
1188 char *new_opts = kstrdup(arg, GFP_KERNEL);
1189 int err;
1190 char *qf_names[MAXQUOTAS];
1191 unsigned int qfmt = 0;
1192 #ifdef CONFIG_QUOTA
1193 int i;
1194
1195 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1196 #endif
1197
1198 rs = SB_DISK_SUPER_BLOCK(s);
1199
1200 if (!reiserfs_parse_options
1201 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1202 qf_names, &qfmt)) {
1203 #ifdef CONFIG_QUOTA
1204 for (i = 0; i < MAXQUOTAS; i++)
1205 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1206 kfree(qf_names[i]);
1207 #endif
1208 err = -EINVAL;
1209 goto out_err;
1210 }
1211 #ifdef CONFIG_QUOTA
1212 handle_quota_files(s, qf_names, &qfmt);
1213 #endif
1214
1215 handle_attrs(s);
1216
1217 /* Add options that are safe here */
1218 safe_mask |= 1 << REISERFS_SMALLTAIL;
1219 safe_mask |= 1 << REISERFS_LARGETAIL;
1220 safe_mask |= 1 << REISERFS_NO_BORDER;
1221 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1222 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1223 safe_mask |= 1 << REISERFS_TEST4;
1224 safe_mask |= 1 << REISERFS_ATTRS;
1225 safe_mask |= 1 << REISERFS_XATTRS_USER;
1226 safe_mask |= 1 << REISERFS_POSIXACL;
1227 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1228 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1229 safe_mask |= 1 << REISERFS_ERROR_RO;
1230 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1231 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1232 safe_mask |= 1 << REISERFS_QUOTA;
1233
1234 /* Update the bitmask, taking care to keep
1235 * the bits we're not allowed to change here */
1236 REISERFS_SB(s)->s_mount_opt =
1237 (REISERFS_SB(s)->
1238 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1239
1240 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1241 journal->j_max_commit_age = commit_max_age;
1242 journal->j_max_trans_age = commit_max_age;
1243 } else if (commit_max_age == 0) {
1244 /* 0 means restore defaults. */
1245 journal->j_max_commit_age = journal->j_default_max_commit_age;
1246 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1247 }
1248
1249 if (blocks) {
1250 err = reiserfs_resize(s, blocks);
1251 if (err != 0)
1252 goto out_err;
1253 }
1254
1255 if (*mount_flags & MS_RDONLY) {
1256 reiserfs_xattr_init(s, *mount_flags);
1257 /* remount read-only */
1258 if (s->s_flags & MS_RDONLY)
1259 /* it is read-only already */
1260 goto out_ok;
1261 /* try to remount file system with read-only permissions */
1262 if (sb_umount_state(rs) == REISERFS_VALID_FS
1263 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1264 goto out_ok;
1265 }
1266
1267 err = journal_begin(&th, s, 10);
1268 if (err)
1269 goto out_err;
1270
1271 /* Mounting a rw partition read-only. */
1272 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1273 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1274 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1275 } else {
1276 /* remount read-write */
1277 if (!(s->s_flags & MS_RDONLY)) {
1278 reiserfs_xattr_init(s, *mount_flags);
1279 goto out_ok; /* We are read-write already */
1280 }
1281
1282 if (reiserfs_is_journal_aborted(journal)) {
1283 err = journal->j_errno;
1284 goto out_err;
1285 }
1286
1287 handle_data_mode(s, mount_options);
1288 handle_barrier_mode(s, mount_options);
1289 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1290 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1291 err = journal_begin(&th, s, 10);
1292 if (err)
1293 goto out_err;
1294
1295 /* Mount a partition which is read-only, read-write */
1296 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1297 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1298 s->s_flags &= ~MS_RDONLY;
1299 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1300 if (!old_format_only(s))
1301 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1302 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1303 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1304 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1305 }
1306 /* this will force a full flush of all journal lists */
1307 SB_JOURNAL(s)->j_must_wait = 1;
1308 err = journal_end(&th, s, 10);
1309 if (err)
1310 goto out_err;
1311 s->s_dirt = 0;
1312
1313 if (!(*mount_flags & MS_RDONLY)) {
1314 finish_unfinished(s);
1315 reiserfs_xattr_init(s, *mount_flags);
1316 }
1317
1318 out_ok:
1319 kfree(s->s_options);
1320 s->s_options = new_opts;
1321 return 0;
1322
1323 out_err:
1324 kfree(new_opts);
1325 return err;
1326 }
1327
1328 static int read_super_block(struct super_block *s, int offset)
1329 {
1330 struct buffer_head *bh;
1331 struct reiserfs_super_block *rs;
1332 int fs_blocksize;
1333
1334 bh = sb_bread(s, offset / s->s_blocksize);
1335 if (!bh) {
1336 reiserfs_warning(s, "sh-2006",
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 (!is_any_reiserfs_magic_string(rs)) {
1345 brelse(bh);
1346 return 1;
1347 }
1348 //
1349 // ok, reiserfs signature (old or new) found in at the given offset
1350 //
1351 fs_blocksize = sb_blocksize(rs);
1352 brelse(bh);
1353 sb_set_blocksize(s, fs_blocksize);
1354
1355 bh = sb_bread(s, offset / s->s_blocksize);
1356 if (!bh) {
1357 reiserfs_warning(s, "sh-2007",
1358 "bread failed (dev %s, block %lu, size %lu)",
1359 reiserfs_bdevname(s), offset / s->s_blocksize,
1360 s->s_blocksize);
1361 return 1;
1362 }
1363
1364 rs = (struct reiserfs_super_block *)bh->b_data;
1365 if (sb_blocksize(rs) != s->s_blocksize) {
1366 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1367 "filesystem on (dev %s, block %Lu, size %lu)",
1368 reiserfs_bdevname(s),
1369 (unsigned long long)bh->b_blocknr,
1370 s->s_blocksize);
1371 brelse(bh);
1372 return 1;
1373 }
1374
1375 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1376 brelse(bh);
1377 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1378 "--rebuild-tree run detected. Please run\n"
1379 "reiserfsck --rebuild-tree and wait for a "
1380 "completion. If that fails\n"
1381 "get newer reiserfsprogs package");
1382 return 1;
1383 }
1384
1385 SB_BUFFER_WITH_SB(s) = bh;
1386 SB_DISK_SUPER_BLOCK(s) = rs;
1387
1388 if (is_reiserfs_jr(rs)) {
1389 /* magic is of non-standard journal filesystem, look at s_version to
1390 find which format is in use */
1391 if (sb_version(rs) == REISERFS_VERSION_2)
1392 reiserfs_info(s, "found reiserfs format \"3.6\""
1393 " with non-standard journal\n");
1394 else if (sb_version(rs) == REISERFS_VERSION_1)
1395 reiserfs_info(s, "found reiserfs format \"3.5\""
1396 " with non-standard journal\n");
1397 else {
1398 reiserfs_warning(s, "sh-2012", "found unknown "
1399 "format \"%u\" of reiserfs with "
1400 "non-standard magic", sb_version(rs));
1401 return 1;
1402 }
1403 } else
1404 /* s_version of standard format may contain incorrect information,
1405 so we just look at the magic string */
1406 reiserfs_info(s,
1407 "found reiserfs format \"%s\" with standard journal\n",
1408 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1409
1410 s->s_op = &reiserfs_sops;
1411 s->s_export_op = &reiserfs_export_ops;
1412 #ifdef CONFIG_QUOTA
1413 s->s_qcop = &reiserfs_qctl_operations;
1414 s->dq_op = &reiserfs_quota_operations;
1415 #endif
1416
1417 /* new format is limited by the 32 bit wide i_blocks field, want to
1418 ** be one full block below that.
1419 */
1420 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1421 return 0;
1422 }
1423
1424 /* after journal replay, reread all bitmap and super blocks */
1425 static int reread_meta_blocks(struct super_block *s)
1426 {
1427 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1428 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1429 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1430 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1431 return 1;
1432 }
1433
1434 return 0;
1435 }
1436
1437 /////////////////////////////////////////////////////
1438 // hash detection stuff
1439
1440 // if root directory is empty - we set default - Yura's - hash and
1441 // warn about it
1442 // FIXME: we look for only one name in a directory. If tea and yura
1443 // bith have the same value - we ask user to send report to the
1444 // mailing list
1445 static __u32 find_hash_out(struct super_block *s)
1446 {
1447 int retval;
1448 struct inode *inode;
1449 struct cpu_key key;
1450 INITIALIZE_PATH(path);
1451 struct reiserfs_dir_entry de;
1452 __u32 hash = DEFAULT_HASH;
1453
1454 inode = s->s_root->d_inode;
1455
1456 do { // Some serious "goto"-hater was there ;)
1457 u32 teahash, r5hash, yurahash;
1458
1459 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1460 retval = search_by_entry_key(s, &key, &path, &de);
1461 if (retval == IO_ERROR) {
1462 pathrelse(&path);
1463 return UNSET_HASH;
1464 }
1465 if (retval == NAME_NOT_FOUND)
1466 de.de_entry_num--;
1467 set_de_name_and_namelen(&de);
1468 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1469 /* allow override in this case */
1470 if (reiserfs_rupasov_hash(s)) {
1471 hash = YURA_HASH;
1472 }
1473 reiserfs_info(s, "FS seems to be empty, autodetect "
1474 "is using the default hash\n");
1475 break;
1476 }
1477 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1478 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1479 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1480 if (((teahash == r5hash)
1481 &&
1482 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1483 == r5hash)) || ((teahash == yurahash)
1484 && (yurahash ==
1485 GET_HASH_VALUE(deh_offset
1486 (&
1487 (de.
1488 de_deh[de.
1489 de_entry_num])))))
1490 || ((r5hash == yurahash)
1491 && (yurahash ==
1492 GET_HASH_VALUE(deh_offset
1493 (&(de.de_deh[de.de_entry_num])))))) {
1494 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1495 "automatically detect hash function. "
1496 "Please mount with -o "
1497 "hash={tea,rupasov,r5}");
1498 hash = UNSET_HASH;
1499 break;
1500 }
1501 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1502 yurahash)
1503 hash = YURA_HASH;
1504 else if (GET_HASH_VALUE
1505 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1506 hash = TEA_HASH;
1507 else if (GET_HASH_VALUE
1508 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1509 hash = R5_HASH;
1510 else {
1511 reiserfs_warning(s, "reiserfs-2506",
1512 "Unrecognised hash function");
1513 hash = UNSET_HASH;
1514 }
1515 } while (0);
1516
1517 pathrelse(&path);
1518 return hash;
1519 }
1520
1521 // finds out which hash names are sorted with
1522 static int what_hash(struct super_block *s)
1523 {
1524 __u32 code;
1525
1526 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1527
1528 /* reiserfs_hash_detect() == true if any of the hash mount options
1529 ** were used. We must check them to make sure the user isn't
1530 ** using a bad hash value
1531 */
1532 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1533 code = find_hash_out(s);
1534
1535 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1536 /* detection has found the hash, and we must check against the
1537 ** mount options
1538 */
1539 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1540 reiserfs_warning(s, "reiserfs-2507",
1541 "Error, %s hash detected, "
1542 "unable to force rupasov hash",
1543 reiserfs_hashname(code));
1544 code = UNSET_HASH;
1545 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1546 reiserfs_warning(s, "reiserfs-2508",
1547 "Error, %s hash detected, "
1548 "unable to force tea hash",
1549 reiserfs_hashname(code));
1550 code = UNSET_HASH;
1551 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1552 reiserfs_warning(s, "reiserfs-2509",
1553 "Error, %s hash detected, "
1554 "unable to force r5 hash",
1555 reiserfs_hashname(code));
1556 code = UNSET_HASH;
1557 }
1558 } else {
1559 /* find_hash_out was not called or could not determine the hash */
1560 if (reiserfs_rupasov_hash(s)) {
1561 code = YURA_HASH;
1562 } else if (reiserfs_tea_hash(s)) {
1563 code = TEA_HASH;
1564 } else if (reiserfs_r5_hash(s)) {
1565 code = R5_HASH;
1566 }
1567 }
1568
1569 /* if we are mounted RW, and we have a new valid hash code, update
1570 ** the super
1571 */
1572 if (code != UNSET_HASH &&
1573 !(s->s_flags & MS_RDONLY) &&
1574 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1575 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1576 }
1577 return code;
1578 }
1579
1580 // return pointer to appropriate function
1581 static hashf_t hash_function(struct super_block *s)
1582 {
1583 switch (what_hash(s)) {
1584 case TEA_HASH:
1585 reiserfs_info(s, "Using tea hash to sort names\n");
1586 return keyed_hash;
1587 case YURA_HASH:
1588 reiserfs_info(s, "Using rupasov hash to sort names\n");
1589 return yura_hash;
1590 case R5_HASH:
1591 reiserfs_info(s, "Using r5 hash to sort names\n");
1592 return r5_hash;
1593 }
1594 return NULL;
1595 }
1596
1597 // this is used to set up correct value for old partitions
1598 static int function2code(hashf_t func)
1599 {
1600 if (func == keyed_hash)
1601 return TEA_HASH;
1602 if (func == yura_hash)
1603 return YURA_HASH;
1604 if (func == r5_hash)
1605 return R5_HASH;
1606
1607 BUG(); // should never happen
1608
1609 return 0;
1610 }
1611
1612 #define SWARN(silent, s, id, ...) \
1613 if (!(silent)) \
1614 reiserfs_warning(s, id, __VA_ARGS__)
1615
1616 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1617 {
1618 struct inode *root_inode;
1619 struct reiserfs_transaction_handle th;
1620 int old_format = 0;
1621 unsigned long blocks;
1622 unsigned int commit_max_age = 0;
1623 int jinit_done = 0;
1624 struct reiserfs_iget_args args;
1625 struct reiserfs_super_block *rs;
1626 char *jdev_name;
1627 struct reiserfs_sb_info *sbi;
1628 int errval = -EINVAL;
1629 char *qf_names[MAXQUOTAS] = {};
1630 unsigned int qfmt = 0;
1631
1632 save_mount_options(s, data);
1633
1634 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1635 if (!sbi) {
1636 errval = -ENOMEM;
1637 goto error;
1638 }
1639 s->s_fs_info = sbi;
1640 /* Set default values for options: non-aggressive tails, RO on errors */
1641 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1642 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1643 /* no preallocation minimum, be smart in
1644 reiserfs_file_write instead */
1645 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1646 /* Preallocate by 16 blocks (17-1) at once */
1647 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1648 /* setup default block allocator options */
1649 reiserfs_init_alloc_options(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_xattr_init(s, s->s_flags))) {
1846 dput(s->s_root);
1847 s->s_root = NULL;
1848 goto error;
1849 }
1850
1851 /* look for files which were to be removed in previous session */
1852 finish_unfinished(s);
1853 } else {
1854 if (old_format_only(s) && !silent) {
1855 reiserfs_info(s, "using 3.5.x disk format\n");
1856 }
1857
1858 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1859 dput(s->s_root);
1860 s->s_root = NULL;
1861 goto error;
1862 }
1863 }
1864 // mark hash in super block: it could be unset. overwrite should be ok
1865 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1866
1867 handle_attrs(s);
1868
1869 reiserfs_proc_info_init(s);
1870
1871 init_waitqueue_head(&(sbi->s_wait));
1872 spin_lock_init(&sbi->bitmap_lock);
1873
1874 return (0);
1875
1876 error:
1877 if (jinit_done) { /* kill the commit thread, free journal ram */
1878 journal_release_error(NULL, s);
1879 }
1880
1881 reiserfs_free_bitmap_cache(s);
1882 if (SB_BUFFER_WITH_SB(s))
1883 brelse(SB_BUFFER_WITH_SB(s));
1884 #ifdef CONFIG_QUOTA
1885 {
1886 int j;
1887 for (j = 0; j < MAXQUOTAS; j++)
1888 kfree(qf_names[j]);
1889 }
1890 #endif
1891 kfree(sbi);
1892
1893 s->s_fs_info = NULL;
1894 return errval;
1895 }
1896
1897 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1898 {
1899 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1900
1901 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1902 buf->f_bfree = sb_free_blocks(rs);
1903 buf->f_bavail = buf->f_bfree;
1904 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1905 buf->f_bsize = dentry->d_sb->s_blocksize;
1906 /* changed to accommodate gcc folks. */
1907 buf->f_type = REISERFS_SUPER_MAGIC;
1908 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1909 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1910 sizeof(rs->s_uuid)/2);
1911
1912 return 0;
1913 }
1914
1915 #ifdef CONFIG_QUOTA
1916 static int reiserfs_write_dquot(struct dquot *dquot)
1917 {
1918 struct reiserfs_transaction_handle th;
1919 int ret, err;
1920
1921 reiserfs_write_lock(dquot->dq_sb);
1922 ret =
1923 journal_begin(&th, dquot->dq_sb,
1924 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1925 if (ret)
1926 goto out;
1927 ret = dquot_commit(dquot);
1928 err =
1929 journal_end(&th, dquot->dq_sb,
1930 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1931 if (!ret && err)
1932 ret = err;
1933 out:
1934 reiserfs_write_unlock(dquot->dq_sb);
1935 return ret;
1936 }
1937
1938 static int reiserfs_acquire_dquot(struct dquot *dquot)
1939 {
1940 struct reiserfs_transaction_handle th;
1941 int ret, err;
1942
1943 reiserfs_write_lock(dquot->dq_sb);
1944 ret =
1945 journal_begin(&th, dquot->dq_sb,
1946 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1947 if (ret)
1948 goto out;
1949 ret = dquot_acquire(dquot);
1950 err =
1951 journal_end(&th, dquot->dq_sb,
1952 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1953 if (!ret && err)
1954 ret = err;
1955 out:
1956 reiserfs_write_unlock(dquot->dq_sb);
1957 return ret;
1958 }
1959
1960 static int reiserfs_release_dquot(struct dquot *dquot)
1961 {
1962 struct reiserfs_transaction_handle th;
1963 int ret, err;
1964
1965 reiserfs_write_lock(dquot->dq_sb);
1966 ret =
1967 journal_begin(&th, dquot->dq_sb,
1968 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1969 if (ret) {
1970 /* Release dquot anyway to avoid endless cycle in dqput() */
1971 dquot_release(dquot);
1972 goto out;
1973 }
1974 ret = dquot_release(dquot);
1975 err =
1976 journal_end(&th, dquot->dq_sb,
1977 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1978 if (!ret && err)
1979 ret = err;
1980 out:
1981 reiserfs_write_unlock(dquot->dq_sb);
1982 return ret;
1983 }
1984
1985 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1986 {
1987 /* Are we journaling quotas? */
1988 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1989 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1990 dquot_mark_dquot_dirty(dquot);
1991 return reiserfs_write_dquot(dquot);
1992 } else
1993 return dquot_mark_dquot_dirty(dquot);
1994 }
1995
1996 static int reiserfs_write_info(struct super_block *sb, int type)
1997 {
1998 struct reiserfs_transaction_handle th;
1999 int ret, err;
2000
2001 /* Data block + inode block */
2002 reiserfs_write_lock(sb);
2003 ret = journal_begin(&th, sb, 2);
2004 if (ret)
2005 goto out;
2006 ret = dquot_commit_info(sb, type);
2007 err = journal_end(&th, sb, 2);
2008 if (!ret && err)
2009 ret = err;
2010 out:
2011 reiserfs_write_unlock(sb);
2012 return ret;
2013 }
2014
2015 /*
2016 * Turn on quotas during mount time - we need to find the quota file and such...
2017 */
2018 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2019 {
2020 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2021 REISERFS_SB(sb)->s_jquota_fmt, type);
2022 }
2023
2024 /*
2025 * Standard function to be called on quota_on
2026 */
2027 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2028 char *name, int remount)
2029 {
2030 int err;
2031 struct path path;
2032 struct inode *inode;
2033 struct reiserfs_transaction_handle th;
2034
2035 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2036 return -EINVAL;
2037 /* No more checks needed? Path and format_id are bogus anyway... */
2038 if (remount)
2039 return vfs_quota_on(sb, type, format_id, name, 1);
2040 err = kern_path(name, LOOKUP_FOLLOW, &path);
2041 if (err)
2042 return err;
2043 /* Quotafile not on the same filesystem? */
2044 if (path.mnt->mnt_sb != sb) {
2045 err = -EXDEV;
2046 goto out;
2047 }
2048 inode = path.dentry->d_inode;
2049 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2050 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2051 err = reiserfs_unpack(inode, NULL);
2052 if (err) {
2053 reiserfs_warning(sb, "super-6520",
2054 "Unpacking tail of quota file failed"
2055 " (%d). Cannot turn on quotas.", err);
2056 err = -EINVAL;
2057 goto out;
2058 }
2059 mark_inode_dirty(inode);
2060 }
2061 /* Journaling quota? */
2062 if (REISERFS_SB(sb)->s_qf_names[type]) {
2063 /* Quotafile not of fs root? */
2064 if (path.dentry->d_parent != sb->s_root)
2065 reiserfs_warning(sb, "super-6521",
2066 "Quota file not on filesystem root. "
2067 "Journalled quota will not work.");
2068 }
2069
2070 /*
2071 * When we journal data on quota file, we have to flush journal to see
2072 * all updates to the file when we bypass pagecache...
2073 */
2074 if (reiserfs_file_data_log(inode)) {
2075 /* Just start temporary transaction and finish it */
2076 err = journal_begin(&th, sb, 1);
2077 if (err)
2078 goto out;
2079 err = journal_end_sync(&th, sb, 1);
2080 if (err)
2081 goto out;
2082 }
2083 err = vfs_quota_on_path(sb, type, format_id, &path);
2084 out:
2085 path_put(&path);
2086 return err;
2087 }
2088
2089 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2090 * acquiring the locks... As quota files are never truncated and quota code
2091 * itself serializes the operations (and noone else should touch the files)
2092 * we don't have to be afraid of races */
2093 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2094 size_t len, loff_t off)
2095 {
2096 struct inode *inode = sb_dqopt(sb)->files[type];
2097 unsigned long blk = off >> sb->s_blocksize_bits;
2098 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2099 size_t toread;
2100 struct buffer_head tmp_bh, *bh;
2101 loff_t i_size = i_size_read(inode);
2102
2103 if (off > i_size)
2104 return 0;
2105 if (off + len > i_size)
2106 len = i_size - off;
2107 toread = len;
2108 while (toread > 0) {
2109 tocopy =
2110 sb->s_blocksize - offset <
2111 toread ? sb->s_blocksize - offset : toread;
2112 tmp_bh.b_state = 0;
2113 /* Quota files are without tails so we can safely use this function */
2114 reiserfs_write_lock(sb);
2115 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2116 reiserfs_write_unlock(sb);
2117 if (err)
2118 return err;
2119 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2120 memset(data, 0, tocopy);
2121 else {
2122 bh = sb_bread(sb, tmp_bh.b_blocknr);
2123 if (!bh)
2124 return -EIO;
2125 memcpy(data, bh->b_data + offset, tocopy);
2126 brelse(bh);
2127 }
2128 offset = 0;
2129 toread -= tocopy;
2130 data += tocopy;
2131 blk++;
2132 }
2133 return len;
2134 }
2135
2136 /* Write to quotafile (we know the transaction is already started and has
2137 * enough credits) */
2138 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2139 const char *data, size_t len, loff_t off)
2140 {
2141 struct inode *inode = sb_dqopt(sb)->files[type];
2142 unsigned long blk = off >> sb->s_blocksize_bits;
2143 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2144 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2145 size_t towrite = len;
2146 struct buffer_head tmp_bh, *bh;
2147
2148 if (!current->journal_info) {
2149 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2150 " cancelled because transaction is not started.\n",
2151 (unsigned long long)off, (unsigned long long)len);
2152 return -EIO;
2153 }
2154 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2155 while (towrite > 0) {
2156 tocopy = sb->s_blocksize - offset < towrite ?
2157 sb->s_blocksize - offset : towrite;
2158 tmp_bh.b_state = 0;
2159 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2160 if (err)
2161 goto out;
2162 if (offset || tocopy != sb->s_blocksize)
2163 bh = sb_bread(sb, tmp_bh.b_blocknr);
2164 else
2165 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2166 if (!bh) {
2167 err = -EIO;
2168 goto out;
2169 }
2170 lock_buffer(bh);
2171 memcpy(bh->b_data + offset, data, tocopy);
2172 flush_dcache_page(bh->b_page);
2173 set_buffer_uptodate(bh);
2174 unlock_buffer(bh);
2175 reiserfs_prepare_for_journal(sb, bh, 1);
2176 journal_mark_dirty(current->journal_info, sb, bh);
2177 if (!journal_quota)
2178 reiserfs_add_ordered_list(inode, bh);
2179 brelse(bh);
2180 offset = 0;
2181 towrite -= tocopy;
2182 data += tocopy;
2183 blk++;
2184 }
2185 out:
2186 if (len == towrite) {
2187 mutex_unlock(&inode->i_mutex);
2188 return err;
2189 }
2190 if (inode->i_size < off + len - towrite)
2191 i_size_write(inode, off + len - towrite);
2192 inode->i_version++;
2193 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2194 mark_inode_dirty(inode);
2195 mutex_unlock(&inode->i_mutex);
2196 return len - towrite;
2197 }
2198
2199 #endif
2200
2201 static int get_super_block(struct file_system_type *fs_type,
2202 int flags, const char *dev_name,
2203 void *data, struct vfsmount *mnt)
2204 {
2205 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2206 mnt);
2207 }
2208
2209 static int __init init_reiserfs_fs(void)
2210 {
2211 int ret;
2212
2213 if ((ret = init_inodecache())) {
2214 return ret;
2215 }
2216
2217 reiserfs_proc_info_global_init();
2218 reiserfs_proc_register_global("version",
2219 reiserfs_global_version_in_proc);
2220
2221 ret = register_filesystem(&reiserfs_fs_type);
2222
2223 if (ret == 0) {
2224 return 0;
2225 }
2226
2227 reiserfs_proc_unregister_global("version");
2228 reiserfs_proc_info_global_done();
2229 destroy_inodecache();
2230
2231 return ret;
2232 }
2233
2234 static void __exit exit_reiserfs_fs(void)
2235 {
2236 reiserfs_proc_unregister_global("version");
2237 reiserfs_proc_info_global_done();
2238 unregister_filesystem(&reiserfs_fs_type);
2239 destroy_inodecache();
2240 }
2241
2242 struct file_system_type reiserfs_fs_type = {
2243 .owner = THIS_MODULE,
2244 .name = "reiserfs",
2245 .get_sb = get_super_block,
2246 .kill_sb = reiserfs_kill_sb,
2247 .fs_flags = FS_REQUIRES_DEV,
2248 };
2249
2250 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2251 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2252 MODULE_LICENSE("GPL");
2253
2254 module_init(init_reiserfs_fs);
2255 module_exit(exit_reiserfs_fs);
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