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ACPI: pci_root: simplify list traversals
[linux-2.6/linux-acpi-2.6.git] / fs / reiserfs / super.c
blob3567fb9e3fb12140988c8909b48e607edd45c98d
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 if (REISERFS_SB(s)->xattr_root) {
452 d_invalidate(REISERFS_SB(s)->xattr_root);
453 dput(REISERFS_SB(s)->xattr_root);
454 REISERFS_SB(s)->xattr_root = NULL;
455 }
456 if (REISERFS_SB(s)->priv_root) {
457 d_invalidate(REISERFS_SB(s)->priv_root);
458 dput(REISERFS_SB(s)->priv_root);
459 REISERFS_SB(s)->priv_root = NULL;
460 }
461 }
462
463 kill_block_super(s);
464 }
465
466 static void reiserfs_put_super(struct super_block *s)
467 {
468 struct reiserfs_transaction_handle th;
469 th.t_trans_id = 0;
470
471 /* change file system state to current state if it was mounted with read-write permissions */
472 if (!(s->s_flags & MS_RDONLY)) {
473 if (!journal_begin(&th, s, 10)) {
474 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
475 1);
476 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
477 REISERFS_SB(s)->s_mount_state);
478 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
479 }
480 }
481
482 /* note, journal_release checks for readonly mount, and can decide not
483 ** to do a journal_end
484 */
485 journal_release(&th, s);
486
487 reiserfs_free_bitmap_cache(s);
488
489 brelse(SB_BUFFER_WITH_SB(s));
490
491 print_statistics(s);
492
493 if (REISERFS_SB(s)->reserved_blocks != 0) {
494 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
495 REISERFS_SB(s)->reserved_blocks);
496 }
497
498 reiserfs_proc_info_done(s);
499
500 kfree(s->s_fs_info);
501 s->s_fs_info = NULL;
502
503 return;
504 }
505
506 static struct kmem_cache *reiserfs_inode_cachep;
507
508 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
509 {
510 struct reiserfs_inode_info *ei;
511 ei = (struct reiserfs_inode_info *)
512 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
513 if (!ei)
514 return NULL;
515 return &ei->vfs_inode;
516 }
517
518 static void reiserfs_destroy_inode(struct inode *inode)
519 {
520 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
521 }
522
523 static void init_once(void *foo)
524 {
525 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
526
527 INIT_LIST_HEAD(&ei->i_prealloc_list);
528 inode_init_once(&ei->vfs_inode);
529 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
530 ei->i_acl_access = NULL;
531 ei->i_acl_default = NULL;
532 #endif
533 }
534
535 static int init_inodecache(void)
536 {
537 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
538 sizeof(struct
539 reiserfs_inode_info),
540 0, (SLAB_RECLAIM_ACCOUNT|
541 SLAB_MEM_SPREAD),
542 init_once);
543 if (reiserfs_inode_cachep == NULL)
544 return -ENOMEM;
545 return 0;
546 }
547
548 static void destroy_inodecache(void)
549 {
550 kmem_cache_destroy(reiserfs_inode_cachep);
551 }
552
553 /* we don't mark inodes dirty, we just log them */
554 static void reiserfs_dirty_inode(struct inode *inode)
555 {
556 struct reiserfs_transaction_handle th;
557
558 int err = 0;
559 if (inode->i_sb->s_flags & MS_RDONLY) {
560 reiserfs_warning(inode->i_sb, "clm-6006",
561 "writing inode %lu on readonly FS",
562 inode->i_ino);
563 return;
564 }
565 reiserfs_write_lock(inode->i_sb);
566
567 /* this is really only used for atime updates, so they don't have
568 ** to be included in O_SYNC or fsync
569 */
570 err = journal_begin(&th, inode->i_sb, 1);
571 if (err) {
572 reiserfs_write_unlock(inode->i_sb);
573 return;
574 }
575 reiserfs_update_sd(&th, inode);
576 journal_end(&th, inode->i_sb, 1);
577 reiserfs_write_unlock(inode->i_sb);
578 }
579
580 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
581 static void reiserfs_clear_inode(struct inode *inode)
582 {
583 struct posix_acl *acl;
584
585 acl = REISERFS_I(inode)->i_acl_access;
586 if (acl && !IS_ERR(acl))
587 posix_acl_release(acl);
588 REISERFS_I(inode)->i_acl_access = NULL;
589
590 acl = REISERFS_I(inode)->i_acl_default;
591 if (acl && !IS_ERR(acl))
592 posix_acl_release(acl);
593 REISERFS_I(inode)->i_acl_default = NULL;
594 }
595 #else
596 #define reiserfs_clear_inode NULL
597 #endif
598
599 #ifdef CONFIG_QUOTA
600 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
601 size_t, loff_t);
602 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
603 loff_t);
604 #endif
605
606 static const struct super_operations reiserfs_sops = {
607 .alloc_inode = reiserfs_alloc_inode,
608 .destroy_inode = reiserfs_destroy_inode,
609 .write_inode = reiserfs_write_inode,
610 .dirty_inode = reiserfs_dirty_inode,
611 .delete_inode = reiserfs_delete_inode,
612 .clear_inode = reiserfs_clear_inode,
613 .put_super = reiserfs_put_super,
614 .write_super = reiserfs_write_super,
615 .sync_fs = reiserfs_sync_fs,
616 .freeze_fs = reiserfs_freeze,
617 .unfreeze_fs = reiserfs_unfreeze,
618 .statfs = reiserfs_statfs,
619 .remount_fs = reiserfs_remount,
620 .show_options = generic_show_options,
621 #ifdef CONFIG_QUOTA
622 .quota_read = reiserfs_quota_read,
623 .quota_write = reiserfs_quota_write,
624 #endif
625 };
626
627 #ifdef CONFIG_QUOTA
628 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
629
630 static int reiserfs_write_dquot(struct dquot *);
631 static int reiserfs_acquire_dquot(struct dquot *);
632 static int reiserfs_release_dquot(struct dquot *);
633 static int reiserfs_mark_dquot_dirty(struct dquot *);
634 static int reiserfs_write_info(struct super_block *, int);
635 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
636
637 static struct dquot_operations reiserfs_quota_operations = {
638 .initialize = dquot_initialize,
639 .drop = dquot_drop,
640 .alloc_space = dquot_alloc_space,
641 .alloc_inode = dquot_alloc_inode,
642 .free_space = dquot_free_space,
643 .free_inode = dquot_free_inode,
644 .transfer = dquot_transfer,
645 .write_dquot = reiserfs_write_dquot,
646 .acquire_dquot = reiserfs_acquire_dquot,
647 .release_dquot = reiserfs_release_dquot,
648 .mark_dirty = reiserfs_mark_dquot_dirty,
649 .write_info = reiserfs_write_info,
650 .alloc_dquot = dquot_alloc,
651 .destroy_dquot = dquot_destroy,
652 };
653
654 static struct quotactl_ops reiserfs_qctl_operations = {
655 .quota_on = reiserfs_quota_on,
656 .quota_off = vfs_quota_off,
657 .quota_sync = vfs_quota_sync,
658 .get_info = vfs_get_dqinfo,
659 .set_info = vfs_set_dqinfo,
660 .get_dqblk = vfs_get_dqblk,
661 .set_dqblk = vfs_set_dqblk,
662 };
663 #endif
664
665 static const struct export_operations reiserfs_export_ops = {
666 .encode_fh = reiserfs_encode_fh,
667 .fh_to_dentry = reiserfs_fh_to_dentry,
668 .fh_to_parent = reiserfs_fh_to_parent,
669 .get_parent = reiserfs_get_parent,
670 };
671
672 /* this struct is used in reiserfs_getopt () for containing the value for those
673 mount options that have values rather than being toggles. */
674 typedef struct {
675 char *value;
676 int setmask; /* bitmask which is to set on mount_options bitmask when this
677 value is found, 0 is no bits are to be changed. */
678 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
679 value is found, 0 is no bits are to be changed. This is
680 applied BEFORE setmask */
681 } arg_desc_t;
682
683 /* Set this bit in arg_required to allow empty arguments */
684 #define REISERFS_OPT_ALLOWEMPTY 31
685
686 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
687 mount options */
688 typedef struct {
689 char *option_name;
690 int arg_required; /* 0 if argument is not required, not 0 otherwise */
691 const arg_desc_t *values; /* list of values accepted by an option */
692 int setmask; /* bitmask which is to set on mount_options bitmask when this
693 value is found, 0 is no bits are to be changed. */
694 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
695 value is found, 0 is no bits are to be changed. This is
696 applied BEFORE setmask */
697 } opt_desc_t;
698
699 /* possible values for -o data= */
700 static const arg_desc_t logging_mode[] = {
701 {"ordered", 1 << REISERFS_DATA_ORDERED,
702 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
703 {"journal", 1 << REISERFS_DATA_LOG,
704 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
705 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
706 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
707 {.value = NULL}
708 };
709
710 /* possible values for -o barrier= */
711 static const arg_desc_t barrier_mode[] = {
712 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
713 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
714 {.value = NULL}
715 };
716
717 /* possible values for "-o block-allocator=" and bits which are to be set in
718 s_mount_opt of reiserfs specific part of in-core super block */
719 static const arg_desc_t balloc[] = {
720 {"noborder", 1 << REISERFS_NO_BORDER, 0},
721 {"border", 0, 1 << REISERFS_NO_BORDER},
722 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
723 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
724 {"test4", 1 << REISERFS_TEST4, 0},
725 {"notest4", 0, 1 << REISERFS_TEST4},
726 {NULL, 0, 0}
727 };
728
729 static const arg_desc_t tails[] = {
730 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
731 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
732 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
733 {NULL, 0, 0}
734 };
735
736 static const arg_desc_t error_actions[] = {
737 {"panic", 1 << REISERFS_ERROR_PANIC,
738 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
739 {"ro-remount", 1 << REISERFS_ERROR_RO,
740 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
741 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
742 {"continue", 1 << REISERFS_ERROR_CONTINUE,
743 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
744 #endif
745 {NULL, 0, 0},
746 };
747
748 /* proceed only one option from a list *cur - string containing of mount options
749 opts - array of options which are accepted
750 opt_arg - if option is found and requires an argument and if it is specifed
751 in the input - pointer to the argument is stored here
752 bit_flags - if option requires to set a certain bit - it is set here
753 return -1 if unknown option is found, opt->arg_required otherwise */
754 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
755 char **opt_arg, unsigned long *bit_flags)
756 {
757 char *p;
758 /* foo=bar,
759 ^ ^ ^
760 | | +-- option_end
761 | +-- arg_start
762 +-- option_start
763 */
764 const opt_desc_t *opt;
765 const arg_desc_t *arg;
766
767 p = *cur;
768
769 /* assume argument cannot contain commas */
770 *cur = strchr(p, ',');
771 if (*cur) {
772 *(*cur) = '\0';
773 (*cur)++;
774 }
775
776 if (!strncmp(p, "alloc=", 6)) {
777 /* Ugly special case, probably we should redo options parser so that
778 it can understand several arguments for some options, also so that
779 it can fill several bitfields with option values. */
780 if (reiserfs_parse_alloc_options(s, p + 6)) {
781 return -1;
782 } else {
783 return 0;
784 }
785 }
786
787 /* for every option in the list */
788 for (opt = opts; opt->option_name; opt++) {
789 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
790 if (bit_flags) {
791 if (opt->clrmask ==
792 (1 << REISERFS_UNSUPPORTED_OPT))
793 reiserfs_warning(s, "super-6500",
794 "%s not supported.\n",
795 p);
796 else
797 *bit_flags &= ~opt->clrmask;
798 if (opt->setmask ==
799 (1 << REISERFS_UNSUPPORTED_OPT))
800 reiserfs_warning(s, "super-6501",
801 "%s not supported.\n",
802 p);
803 else
804 *bit_flags |= opt->setmask;
805 }
806 break;
807 }
808 }
809 if (!opt->option_name) {
810 reiserfs_warning(s, "super-6502",
811 "unknown mount option \"%s\"", p);
812 return -1;
813 }
814
815 p += strlen(opt->option_name);
816 switch (*p) {
817 case '=':
818 if (!opt->arg_required) {
819 reiserfs_warning(s, "super-6503",
820 "the option \"%s\" does not "
821 "require an argument\n",
822 opt->option_name);
823 return -1;
824 }
825 break;
826
827 case 0:
828 if (opt->arg_required) {
829 reiserfs_warning(s, "super-6504",
830 "the option \"%s\" requires an "
831 "argument\n", opt->option_name);
832 return -1;
833 }
834 break;
835 default:
836 reiserfs_warning(s, "super-6505",
837 "head of option \"%s\" is only correct\n",
838 opt->option_name);
839 return -1;
840 }
841
842 /* move to the argument, or to next option if argument is not required */
843 p++;
844
845 if (opt->arg_required
846 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
847 && !strlen(p)) {
848 /* this catches "option=," if not allowed */
849 reiserfs_warning(s, "super-6506",
850 "empty argument for \"%s\"\n",
851 opt->option_name);
852 return -1;
853 }
854
855 if (!opt->values) {
856 /* *=NULLopt_arg contains pointer to argument */
857 *opt_arg = p;
858 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
859 }
860
861 /* values possible for this option are listed in opt->values */
862 for (arg = opt->values; arg->value; arg++) {
863 if (!strcmp(p, arg->value)) {
864 if (bit_flags) {
865 *bit_flags &= ~arg->clrmask;
866 *bit_flags |= arg->setmask;
867 }
868 return opt->arg_required;
869 }
870 }
871
872 reiserfs_warning(s, "super-6506",
873 "bad value \"%s\" for option \"%s\"\n", p,
874 opt->option_name);
875 return -1;
876 }
877
878 /* returns 0 if something is wrong in option string, 1 - otherwise */
879 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
880 unsigned long *mount_options,
881 /* after the parsing phase, contains the
882 collection of bitflags defining what
883 mount options were selected. */
884 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
885 char **jdev_name,
886 unsigned int *commit_max_age,
887 char **qf_names,
888 unsigned int *qfmt)
889 {
890 int c;
891 char *arg = NULL;
892 char *pos;
893 opt_desc_t opts[] = {
894 /* Compatibility stuff, so that -o notail for old setups still work */
895 {"tails",.arg_required = 't',.values = tails},
896 {"notail",.clrmask =
897 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
898 {"conv",.setmask = 1 << REISERFS_CONVERT},
899 {"attrs",.setmask = 1 << REISERFS_ATTRS},
900 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
901 #ifdef CONFIG_REISERFS_FS_XATTR
902 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
903 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
904 #else
905 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
906 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
907 #endif
908 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
909 {"acl",.setmask = 1 << REISERFS_POSIXACL},
910 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
911 #else
912 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
913 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
914 #endif
915 {.option_name = "nolog"},
916 {"replayonly",.setmask = 1 << REPLAYONLY},
917 {"block-allocator",.arg_required = 'a',.values = balloc},
918 {"data",.arg_required = 'd',.values = logging_mode},
919 {"barrier",.arg_required = 'b',.values = barrier_mode},
920 {"resize",.arg_required = 'r',.values = NULL},
921 {"jdev",.arg_required = 'j',.values = NULL},
922 {"nolargeio",.arg_required = 'w',.values = NULL},
923 {"commit",.arg_required = 'c',.values = NULL},
924 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
925 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
926 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
927 {"errors",.arg_required = 'e',.values = error_actions},
928 {"usrjquota",.arg_required =
929 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
930 {"grpjquota",.arg_required =
931 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
932 {"jqfmt",.arg_required = 'f',.values = NULL},
933 {.option_name = NULL}
934 };
935
936 *blocks = 0;
937 if (!options || !*options)
938 /* use default configuration: create tails, journaling on, no
939 conversion to newest format */
940 return 1;
941
942 for (pos = options; pos;) {
943 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
944 if (c == -1)
945 /* wrong option is given */
946 return 0;
947
948 if (c == 'r') {
949 char *p;
950
951 p = NULL;
952 /* "resize=NNN" or "resize=auto" */
953
954 if (!strcmp(arg, "auto")) {
955 /* From JFS code, to auto-get the size. */
956 *blocks =
957 s->s_bdev->bd_inode->i_size >> s->
958 s_blocksize_bits;
959 } else {
960 *blocks = simple_strtoul(arg, &p, 0);
961 if (*p != '\0') {
962 /* NNN does not look like a number */
963 reiserfs_warning(s, "super-6507",
964 "bad value %s for "
965 "-oresize\n", arg);
966 return 0;
967 }
968 }
969 }
970
971 if (c == 'c') {
972 char *p = NULL;
973 unsigned long val = simple_strtoul(arg, &p, 0);
974 /* commit=NNN (time in seconds) */
975 if (*p != '\0' || val >= (unsigned int)-1) {
976 reiserfs_warning(s, "super-6508",
977 "bad value %s for -ocommit\n",
978 arg);
979 return 0;
980 }
981 *commit_max_age = (unsigned int)val;
982 }
983
984 if (c == 'w') {
985 reiserfs_warning(s, "super-6509", "nolargeio option "
986 "is no longer supported");
987 return 0;
988 }
989
990 if (c == 'j') {
991 if (arg && *arg && jdev_name) {
992 if (*jdev_name) { //Hm, already assigned?
993 reiserfs_warning(s, "super-6510",
994 "journal device was "
995 "already specified to "
996 "be %s", *jdev_name);
997 return 0;
998 }
999 *jdev_name = arg;
1000 }
1001 }
1002 #ifdef CONFIG_QUOTA
1003 if (c == 'u' || c == 'g') {
1004 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1005
1006 if (sb_any_quota_loaded(s) &&
1007 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1008 reiserfs_warning(s, "super-6511",
1009 "cannot change journaled "
1010 "quota options when quota "
1011 "turned on.");
1012 return 0;
1013 }
1014 if (*arg) { /* Some filename specified? */
1015 if (REISERFS_SB(s)->s_qf_names[qtype]
1016 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1017 arg)) {
1018 reiserfs_warning(s, "super-6512",
1019 "%s quota file "
1020 "already specified.",
1021 QTYPE2NAME(qtype));
1022 return 0;
1023 }
1024 if (strchr(arg, '/')) {
1025 reiserfs_warning(s, "super-6513",
1026 "quotafile must be "
1027 "on filesystem root.");
1028 return 0;
1029 }
1030 qf_names[qtype] =
1031 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1032 if (!qf_names[qtype]) {
1033 reiserfs_warning(s, "reiserfs-2502",
1034 "not enough memory "
1035 "for storing "
1036 "quotafile name.");
1037 return 0;
1038 }
1039 strcpy(qf_names[qtype], arg);
1040 *mount_options |= 1 << REISERFS_QUOTA;
1041 } else {
1042 if (qf_names[qtype] !=
1043 REISERFS_SB(s)->s_qf_names[qtype])
1044 kfree(qf_names[qtype]);
1045 qf_names[qtype] = NULL;
1046 }
1047 }
1048 if (c == 'f') {
1049 if (!strcmp(arg, "vfsold"))
1050 *qfmt = QFMT_VFS_OLD;
1051 else if (!strcmp(arg, "vfsv0"))
1052 *qfmt = QFMT_VFS_V0;
1053 else {
1054 reiserfs_warning(s, "super-6514",
1055 "unknown quota format "
1056 "specified.");
1057 return 0;
1058 }
1059 if (sb_any_quota_loaded(s) &&
1060 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1061 reiserfs_warning(s, "super-6515",
1062 "cannot change journaled "
1063 "quota options when quota "
1064 "turned on.");
1065 return 0;
1066 }
1067 }
1068 #else
1069 if (c == 'u' || c == 'g' || c == 'f') {
1070 reiserfs_warning(s, "reiserfs-2503", "journaled "
1071 "quota options not supported.");
1072 return 0;
1073 }
1074 #endif
1075 }
1076
1077 #ifdef CONFIG_QUOTA
1078 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1079 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1080 reiserfs_warning(s, "super-6515",
1081 "journaled quota format not specified.");
1082 return 0;
1083 }
1084 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1085 if (!(*mount_options & (1 << REISERFS_QUOTA))
1086 && sb_any_quota_loaded(s)) {
1087 reiserfs_warning(s, "super-6516", "quota options must "
1088 "be present when quota is turned on.");
1089 return 0;
1090 }
1091 #endif
1092
1093 return 1;
1094 }
1095
1096 static void switch_data_mode(struct super_block *s, unsigned long mode)
1097 {
1098 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1099 (1 << REISERFS_DATA_ORDERED) |
1100 (1 << REISERFS_DATA_WRITEBACK));
1101 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1102 }
1103
1104 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1105 {
1106 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1107 if (!reiserfs_data_log(s)) {
1108 switch_data_mode(s, REISERFS_DATA_LOG);
1109 reiserfs_info(s, "switching to journaled data mode\n");
1110 }
1111 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1112 if (!reiserfs_data_ordered(s)) {
1113 switch_data_mode(s, REISERFS_DATA_ORDERED);
1114 reiserfs_info(s, "switching to ordered data mode\n");
1115 }
1116 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1117 if (!reiserfs_data_writeback(s)) {
1118 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1119 reiserfs_info(s, "switching to writeback data mode\n");
1120 }
1121 }
1122 }
1123
1124 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1125 {
1126 int flush = (1 << REISERFS_BARRIER_FLUSH);
1127 int none = (1 << REISERFS_BARRIER_NONE);
1128 int all_barrier = flush | none;
1129
1130 if (bits & all_barrier) {
1131 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1132 if (bits & flush) {
1133 REISERFS_SB(s)->s_mount_opt |= flush;
1134 printk("reiserfs: enabling write barrier flush mode\n");
1135 } else if (bits & none) {
1136 REISERFS_SB(s)->s_mount_opt |= none;
1137 printk("reiserfs: write barriers turned off\n");
1138 }
1139 }
1140 }
1141
1142 static void handle_attrs(struct super_block *s)
1143 {
1144 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1145
1146 if (reiserfs_attrs(s)) {
1147 if (old_format_only(s)) {
1148 reiserfs_warning(s, "super-6517", "cannot support "
1149 "attributes on 3.5.x disk format");
1150 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1151 return;
1152 }
1153 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1154 reiserfs_warning(s, "super-6518", "cannot support "
1155 "attributes until flag is set in "
1156 "super-block");
1157 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1158 }
1159 }
1160 }
1161
1162 #ifdef CONFIG_QUOTA
1163 static void handle_quota_files(struct super_block *s, char **qf_names,
1164 unsigned int *qfmt)
1165 {
1166 int i;
1167
1168 for (i = 0; i < MAXQUOTAS; i++) {
1169 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1170 kfree(REISERFS_SB(s)->s_qf_names[i]);
1171 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1172 }
1173 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1174 }
1175 #endif
1176
1177 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1178 {
1179 struct reiserfs_super_block *rs;
1180 struct reiserfs_transaction_handle th;
1181 unsigned long blocks;
1182 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1183 unsigned long safe_mask = 0;
1184 unsigned int commit_max_age = (unsigned int)-1;
1185 struct reiserfs_journal *journal = SB_JOURNAL(s);
1186 char *new_opts = kstrdup(arg, GFP_KERNEL);
1187 int err;
1188 char *qf_names[MAXQUOTAS];
1189 unsigned int qfmt = 0;
1190 #ifdef CONFIG_QUOTA
1191 int i;
1192
1193 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1194 #endif
1195
1196 rs = SB_DISK_SUPER_BLOCK(s);
1197
1198 if (!reiserfs_parse_options
1199 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1200 qf_names, &qfmt)) {
1201 #ifdef CONFIG_QUOTA
1202 for (i = 0; i < MAXQUOTAS; i++)
1203 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1204 kfree(qf_names[i]);
1205 #endif
1206 err = -EINVAL;
1207 goto out_err;
1208 }
1209 #ifdef CONFIG_QUOTA
1210 handle_quota_files(s, qf_names, &qfmt);
1211 #endif
1212
1213 handle_attrs(s);
1214
1215 /* Add options that are safe here */
1216 safe_mask |= 1 << REISERFS_SMALLTAIL;
1217 safe_mask |= 1 << REISERFS_LARGETAIL;
1218 safe_mask |= 1 << REISERFS_NO_BORDER;
1219 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1220 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1221 safe_mask |= 1 << REISERFS_TEST4;
1222 safe_mask |= 1 << REISERFS_ATTRS;
1223 safe_mask |= 1 << REISERFS_XATTRS_USER;
1224 safe_mask |= 1 << REISERFS_POSIXACL;
1225 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1226 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1227 safe_mask |= 1 << REISERFS_ERROR_RO;
1228 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1229 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1230 safe_mask |= 1 << REISERFS_QUOTA;
1231
1232 /* Update the bitmask, taking care to keep
1233 * the bits we're not allowed to change here */
1234 REISERFS_SB(s)->s_mount_opt =
1235 (REISERFS_SB(s)->
1236 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1237
1238 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1239 journal->j_max_commit_age = commit_max_age;
1240 journal->j_max_trans_age = commit_max_age;
1241 } else if (commit_max_age == 0) {
1242 /* 0 means restore defaults. */
1243 journal->j_max_commit_age = journal->j_default_max_commit_age;
1244 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1245 }
1246
1247 if (blocks) {
1248 err = reiserfs_resize(s, blocks);
1249 if (err != 0)
1250 goto out_err;
1251 }
1252
1253 if (*mount_flags & MS_RDONLY) {
1254 reiserfs_xattr_init(s, *mount_flags);
1255 /* remount read-only */
1256 if (s->s_flags & MS_RDONLY)
1257 /* it is read-only already */
1258 goto out_ok;
1259 /* try to remount file system with read-only permissions */
1260 if (sb_umount_state(rs) == REISERFS_VALID_FS
1261 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1262 goto out_ok;
1263 }
1264
1265 err = journal_begin(&th, s, 10);
1266 if (err)
1267 goto out_err;
1268
1269 /* Mounting a rw partition read-only. */
1270 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1271 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1272 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1273 } else {
1274 /* remount read-write */
1275 if (!(s->s_flags & MS_RDONLY)) {
1276 reiserfs_xattr_init(s, *mount_flags);
1277 goto out_ok; /* We are read-write already */
1278 }
1279
1280 if (reiserfs_is_journal_aborted(journal)) {
1281 err = journal->j_errno;
1282 goto out_err;
1283 }
1284
1285 handle_data_mode(s, mount_options);
1286 handle_barrier_mode(s, mount_options);
1287 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1288 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1289 err = journal_begin(&th, s, 10);
1290 if (err)
1291 goto out_err;
1292
1293 /* Mount a partition which is read-only, read-write */
1294 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1295 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1296 s->s_flags &= ~MS_RDONLY;
1297 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1298 if (!old_format_only(s))
1299 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1300 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1301 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1302 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1303 }
1304 /* this will force a full flush of all journal lists */
1305 SB_JOURNAL(s)->j_must_wait = 1;
1306 err = journal_end(&th, s, 10);
1307 if (err)
1308 goto out_err;
1309 s->s_dirt = 0;
1310
1311 if (!(*mount_flags & MS_RDONLY)) {
1312 finish_unfinished(s);
1313 reiserfs_xattr_init(s, *mount_flags);
1314 }
1315
1316 out_ok:
1317 replace_mount_options(s, new_opts);
1318 return 0;
1319
1320 out_err:
1321 kfree(new_opts);
1322 return err;
1323 }
1324
1325 static int read_super_block(struct super_block *s, int offset)
1326 {
1327 struct buffer_head *bh;
1328 struct reiserfs_super_block *rs;
1329 int fs_blocksize;
1330
1331 bh = sb_bread(s, offset / s->s_blocksize);
1332 if (!bh) {
1333 reiserfs_warning(s, "sh-2006",
1334 "bread failed (dev %s, block %lu, size %lu)",
1335 reiserfs_bdevname(s), offset / s->s_blocksize,
1336 s->s_blocksize);
1337 return 1;
1338 }
1339
1340 rs = (struct reiserfs_super_block *)bh->b_data;
1341 if (!is_any_reiserfs_magic_string(rs)) {
1342 brelse(bh);
1343 return 1;
1344 }
1345 //
1346 // ok, reiserfs signature (old or new) found in at the given offset
1347 //
1348 fs_blocksize = sb_blocksize(rs);
1349 brelse(bh);
1350 sb_set_blocksize(s, fs_blocksize);
1351
1352 bh = sb_bread(s, offset / s->s_blocksize);
1353 if (!bh) {
1354 reiserfs_warning(s, "sh-2007",
1355 "bread failed (dev %s, block %lu, size %lu)",
1356 reiserfs_bdevname(s), offset / s->s_blocksize,
1357 s->s_blocksize);
1358 return 1;
1359 }
1360
1361 rs = (struct reiserfs_super_block *)bh->b_data;
1362 if (sb_blocksize(rs) != s->s_blocksize) {
1363 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1364 "filesystem on (dev %s, block %Lu, size %lu)",
1365 reiserfs_bdevname(s),
1366 (unsigned long long)bh->b_blocknr,
1367 s->s_blocksize);
1368 brelse(bh);
1369 return 1;
1370 }
1371
1372 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1373 brelse(bh);
1374 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1375 "--rebuild-tree run detected. Please run\n"
1376 "reiserfsck --rebuild-tree and wait for a "
1377 "completion. If that fails\n"
1378 "get newer reiserfsprogs package");
1379 return 1;
1380 }
1381
1382 SB_BUFFER_WITH_SB(s) = bh;
1383 SB_DISK_SUPER_BLOCK(s) = rs;
1384
1385 if (is_reiserfs_jr(rs)) {
1386 /* magic is of non-standard journal filesystem, look at s_version to
1387 find which format is in use */
1388 if (sb_version(rs) == REISERFS_VERSION_2)
1389 reiserfs_info(s, "found reiserfs format \"3.6\""
1390 " with non-standard journal\n");
1391 else if (sb_version(rs) == REISERFS_VERSION_1)
1392 reiserfs_info(s, "found reiserfs format \"3.5\""
1393 " with non-standard journal\n");
1394 else {
1395 reiserfs_warning(s, "sh-2012", "found unknown "
1396 "format \"%u\" of reiserfs with "
1397 "non-standard magic", sb_version(rs));
1398 return 1;
1399 }
1400 } else
1401 /* s_version of standard format may contain incorrect information,
1402 so we just look at the magic string */
1403 reiserfs_info(s,
1404 "found reiserfs format \"%s\" with standard journal\n",
1405 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1406
1407 s->s_op = &reiserfs_sops;
1408 s->s_export_op = &reiserfs_export_ops;
1409 #ifdef CONFIG_QUOTA
1410 s->s_qcop = &reiserfs_qctl_operations;
1411 s->dq_op = &reiserfs_quota_operations;
1412 #endif
1413
1414 /* new format is limited by the 32 bit wide i_blocks field, want to
1415 ** be one full block below that.
1416 */
1417 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1418 return 0;
1419 }
1420
1421 /* after journal replay, reread all bitmap and super blocks */
1422 static int reread_meta_blocks(struct super_block *s)
1423 {
1424 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1425 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1426 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1427 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1428 return 1;
1429 }
1430
1431 return 0;
1432 }
1433
1434 /////////////////////////////////////////////////////
1435 // hash detection stuff
1436
1437 // if root directory is empty - we set default - Yura's - hash and
1438 // warn about it
1439 // FIXME: we look for only one name in a directory. If tea and yura
1440 // bith have the same value - we ask user to send report to the
1441 // mailing list
1442 static __u32 find_hash_out(struct super_block *s)
1443 {
1444 int retval;
1445 struct inode *inode;
1446 struct cpu_key key;
1447 INITIALIZE_PATH(path);
1448 struct reiserfs_dir_entry de;
1449 __u32 hash = DEFAULT_HASH;
1450
1451 inode = s->s_root->d_inode;
1452
1453 do { // Some serious "goto"-hater was there ;)
1454 u32 teahash, r5hash, yurahash;
1455
1456 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1457 retval = search_by_entry_key(s, &key, &path, &de);
1458 if (retval == IO_ERROR) {
1459 pathrelse(&path);
1460 return UNSET_HASH;
1461 }
1462 if (retval == NAME_NOT_FOUND)
1463 de.de_entry_num--;
1464 set_de_name_and_namelen(&de);
1465 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1466 /* allow override in this case */
1467 if (reiserfs_rupasov_hash(s)) {
1468 hash = YURA_HASH;
1469 }
1470 reiserfs_info(s, "FS seems to be empty, autodetect "
1471 "is using the default hash\n");
1472 break;
1473 }
1474 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1475 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1476 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1477 if (((teahash == r5hash)
1478 &&
1479 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1480 == r5hash)) || ((teahash == yurahash)
1481 && (yurahash ==
1482 GET_HASH_VALUE(deh_offset
1483 (&
1484 (de.
1485 de_deh[de.
1486 de_entry_num])))))
1487 || ((r5hash == yurahash)
1488 && (yurahash ==
1489 GET_HASH_VALUE(deh_offset
1490 (&(de.de_deh[de.de_entry_num])))))) {
1491 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1492 "automatically detect hash function. "
1493 "Please mount with -o "
1494 "hash={tea,rupasov,r5}");
1495 hash = UNSET_HASH;
1496 break;
1497 }
1498 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1499 yurahash)
1500 hash = YURA_HASH;
1501 else if (GET_HASH_VALUE
1502 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1503 hash = TEA_HASH;
1504 else if (GET_HASH_VALUE
1505 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1506 hash = R5_HASH;
1507 else {
1508 reiserfs_warning(s, "reiserfs-2506",
1509 "Unrecognised hash function");
1510 hash = UNSET_HASH;
1511 }
1512 } while (0);
1513
1514 pathrelse(&path);
1515 return hash;
1516 }
1517
1518 // finds out which hash names are sorted with
1519 static int what_hash(struct super_block *s)
1520 {
1521 __u32 code;
1522
1523 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1524
1525 /* reiserfs_hash_detect() == true if any of the hash mount options
1526 ** were used. We must check them to make sure the user isn't
1527 ** using a bad hash value
1528 */
1529 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1530 code = find_hash_out(s);
1531
1532 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1533 /* detection has found the hash, and we must check against the
1534 ** mount options
1535 */
1536 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1537 reiserfs_warning(s, "reiserfs-2507",
1538 "Error, %s hash detected, "
1539 "unable to force rupasov hash",
1540 reiserfs_hashname(code));
1541 code = UNSET_HASH;
1542 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1543 reiserfs_warning(s, "reiserfs-2508",
1544 "Error, %s hash detected, "
1545 "unable to force tea hash",
1546 reiserfs_hashname(code));
1547 code = UNSET_HASH;
1548 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1549 reiserfs_warning(s, "reiserfs-2509",
1550 "Error, %s hash detected, "
1551 "unable to force r5 hash",
1552 reiserfs_hashname(code));
1553 code = UNSET_HASH;
1554 }
1555 } else {
1556 /* find_hash_out was not called or could not determine the hash */
1557 if (reiserfs_rupasov_hash(s)) {
1558 code = YURA_HASH;
1559 } else if (reiserfs_tea_hash(s)) {
1560 code = TEA_HASH;
1561 } else if (reiserfs_r5_hash(s)) {
1562 code = R5_HASH;
1563 }
1564 }
1565
1566 /* if we are mounted RW, and we have a new valid hash code, update
1567 ** the super
1568 */
1569 if (code != UNSET_HASH &&
1570 !(s->s_flags & MS_RDONLY) &&
1571 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1572 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1573 }
1574 return code;
1575 }
1576
1577 // return pointer to appropriate function
1578 static hashf_t hash_function(struct super_block *s)
1579 {
1580 switch (what_hash(s)) {
1581 case TEA_HASH:
1582 reiserfs_info(s, "Using tea hash to sort names\n");
1583 return keyed_hash;
1584 case YURA_HASH:
1585 reiserfs_info(s, "Using rupasov hash to sort names\n");
1586 return yura_hash;
1587 case R5_HASH:
1588 reiserfs_info(s, "Using r5 hash to sort names\n");
1589 return r5_hash;
1590 }
1591 return NULL;
1592 }
1593
1594 // this is used to set up correct value for old partitions
1595 static int function2code(hashf_t func)
1596 {
1597 if (func == keyed_hash)
1598 return TEA_HASH;
1599 if (func == yura_hash)
1600 return YURA_HASH;
1601 if (func == r5_hash)
1602 return R5_HASH;
1603
1604 BUG(); // should never happen
1605
1606 return 0;
1607 }
1608
1609 #define SWARN(silent, s, id, ...) \
1610 if (!(silent)) \
1611 reiserfs_warning(s, id, __VA_ARGS__)
1612
1613 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1614 {
1615 struct inode *root_inode;
1616 struct reiserfs_transaction_handle th;
1617 int old_format = 0;
1618 unsigned long blocks;
1619 unsigned int commit_max_age = 0;
1620 int jinit_done = 0;
1621 struct reiserfs_iget_args args;
1622 struct reiserfs_super_block *rs;
1623 char *jdev_name;
1624 struct reiserfs_sb_info *sbi;
1625 int errval = -EINVAL;
1626 char *qf_names[MAXQUOTAS] = {};
1627 unsigned int qfmt = 0;
1628
1629 save_mount_options(s, data);
1630
1631 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1632 if (!sbi) {
1633 errval = -ENOMEM;
1634 goto error;
1635 }
1636 s->s_fs_info = sbi;
1637 /* Set default values for options: non-aggressive tails, RO on errors */
1638 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1639 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1640 /* no preallocation minimum, be smart in
1641 reiserfs_file_write instead */
1642 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1643 /* Preallocate by 16 blocks (17-1) at once */
1644 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1645 /* setup default block allocator options */
1646 reiserfs_init_alloc_options(s);
1647
1648 jdev_name = NULL;
1649 if (reiserfs_parse_options
1650 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1651 &commit_max_age, qf_names, &qfmt) == 0) {
1652 goto error;
1653 }
1654 #ifdef CONFIG_QUOTA
1655 handle_quota_files(s, qf_names, &qfmt);
1656 #endif
1657
1658 if (blocks) {
1659 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1660 goto error;
1661 }
1662
1663 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1664 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1665 old_format = 1;
1666 /* try new format (64-th 1k block), which can contain reiserfs super block */
1667 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1668 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1669 reiserfs_bdevname(s));
1670 goto error;
1671 }
1672
1673 rs = SB_DISK_SUPER_BLOCK(s);
1674 /* Let's do basic sanity check to verify that underlying device is not
1675 smaller than the filesystem. If the check fails then abort and scream,
1676 because bad stuff will happen otherwise. */
1677 if (s->s_bdev && s->s_bdev->bd_inode
1678 && i_size_read(s->s_bdev->bd_inode) <
1679 sb_block_count(rs) * sb_blocksize(rs)) {
1680 SWARN(silent, s, "", "Filesystem cannot be "
1681 "mounted because it is bigger than the device");
1682 SWARN(silent, s, "", "You may need to run fsck "
1683 "or increase size of your LVM partition");
1684 SWARN(silent, s, "", "Or may be you forgot to "
1685 "reboot after fdisk when it told you to");
1686 goto error;
1687 }
1688
1689 sbi->s_mount_state = SB_REISERFS_STATE(s);
1690 sbi->s_mount_state = REISERFS_VALID_FS;
1691
1692 if ((errval = reiserfs_init_bitmap_cache(s))) {
1693 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1694 goto error;
1695 }
1696 errval = -EINVAL;
1697 #ifdef CONFIG_REISERFS_CHECK
1698 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1699 SWARN(silent, s, "", "- it is slow mode for debugging.");
1700 #endif
1701
1702 /* make data=ordered the default */
1703 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1704 !reiserfs_data_writeback(s)) {
1705 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1706 }
1707
1708 if (reiserfs_data_log(s)) {
1709 reiserfs_info(s, "using journaled data mode\n");
1710 } else if (reiserfs_data_ordered(s)) {
1711 reiserfs_info(s, "using ordered data mode\n");
1712 } else {
1713 reiserfs_info(s, "using writeback data mode\n");
1714 }
1715 if (reiserfs_barrier_flush(s)) {
1716 printk("reiserfs: using flush barriers\n");
1717 }
1718 // set_device_ro(s->s_dev, 1) ;
1719 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1720 SWARN(silent, s, "sh-2022",
1721 "unable to initialize journal space");
1722 goto error;
1723 } else {
1724 jinit_done = 1; /* once this is set, journal_release must be called
1725 ** if we error out of the mount
1726 */
1727 }
1728 if (reread_meta_blocks(s)) {
1729 SWARN(silent, s, "jmacd-9",
1730 "unable to reread meta blocks after journal init");
1731 goto error;
1732 }
1733
1734 if (replay_only(s))
1735 goto error;
1736
1737 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1738 SWARN(silent, s, "clm-7000",
1739 "Detected readonly device, marking FS readonly");
1740 s->s_flags |= MS_RDONLY;
1741 }
1742 args.objectid = REISERFS_ROOT_OBJECTID;
1743 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1744 root_inode =
1745 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1746 reiserfs_init_locked_inode, (void *)(&args));
1747 if (!root_inode) {
1748 SWARN(silent, s, "jmacd-10", "get root inode failed");
1749 goto error;
1750 }
1751
1752 if (root_inode->i_state & I_NEW) {
1753 reiserfs_read_locked_inode(root_inode, &args);
1754 unlock_new_inode(root_inode);
1755 }
1756
1757 s->s_root = d_alloc_root(root_inode);
1758 if (!s->s_root) {
1759 iput(root_inode);
1760 goto error;
1761 }
1762 // define and initialize hash function
1763 sbi->s_hash_function = hash_function(s);
1764 if (sbi->s_hash_function == NULL) {
1765 dput(s->s_root);
1766 s->s_root = NULL;
1767 goto error;
1768 }
1769
1770 if (is_reiserfs_3_5(rs)
1771 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1772 set_bit(REISERFS_3_5, &(sbi->s_properties));
1773 else if (old_format)
1774 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1775 else
1776 set_bit(REISERFS_3_6, &(sbi->s_properties));
1777
1778 if (!(s->s_flags & MS_RDONLY)) {
1779
1780 errval = journal_begin(&th, s, 1);
1781 if (errval) {
1782 dput(s->s_root);
1783 s->s_root = NULL;
1784 goto error;
1785 }
1786 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1787
1788 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1789 set_sb_fs_state(rs, 0);
1790
1791 /* Clear out s_bmap_nr if it would wrap. We can handle this
1792 * case, but older revisions can't. This will cause the
1793 * file system to fail mount on those older implementations,
1794 * avoiding corruption. -jeffm */
1795 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1796 sb_bmap_nr(rs) != 0) {
1797 reiserfs_warning(s, "super-2030", "This file system "
1798 "claims to use %u bitmap blocks in "
1799 "its super block, but requires %u. "
1800 "Clearing to zero.", sb_bmap_nr(rs),
1801 reiserfs_bmap_count(s));
1802
1803 set_sb_bmap_nr(rs, 0);
1804 }
1805
1806 if (old_format_only(s)) {
1807 /* filesystem of format 3.5 either with standard or non-standard
1808 journal */
1809 if (convert_reiserfs(s)) {
1810 /* and -o conv is given */
1811 if (!silent)
1812 reiserfs_info(s,
1813 "converting 3.5 filesystem to the 3.6 format");
1814
1815 if (is_reiserfs_3_5(rs))
1816 /* put magic string of 3.6 format. 2.2 will not be able to
1817 mount this filesystem anymore */
1818 memcpy(rs->s_v1.s_magic,
1819 reiserfs_3_6_magic_string,
1820 sizeof
1821 (reiserfs_3_6_magic_string));
1822
1823 set_sb_version(rs, REISERFS_VERSION_2);
1824 reiserfs_convert_objectid_map_v1(s);
1825 set_bit(REISERFS_3_6, &(sbi->s_properties));
1826 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1827 } else if (!silent) {
1828 reiserfs_info(s, "using 3.5.x disk format\n");
1829 }
1830 } else
1831 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1832
1833
1834 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1835 errval = journal_end(&th, s, 1);
1836 if (errval) {
1837 dput(s->s_root);
1838 s->s_root = NULL;
1839 goto error;
1840 }
1841
1842 if ((errval = reiserfs_lookup_privroot(s)) ||
1843 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1844 dput(s->s_root);
1845 s->s_root = NULL;
1846 goto error;
1847 }
1848
1849 /* look for files which were to be removed in previous session */
1850 finish_unfinished(s);
1851 } else {
1852 if (old_format_only(s) && !silent) {
1853 reiserfs_info(s, "using 3.5.x disk format\n");
1854 }
1855
1856 if ((errval = reiserfs_lookup_privroot(s)) ||
1857 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1858 dput(s->s_root);
1859 s->s_root = NULL;
1860 goto error;
1861 }
1862 }
1863 // mark hash in super block: it could be unset. overwrite should be ok
1864 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1865
1866 handle_attrs(s);
1867
1868 reiserfs_proc_info_init(s);
1869
1870 init_waitqueue_head(&(sbi->s_wait));
1871 spin_lock_init(&sbi->bitmap_lock);
1872
1873 return (0);
1874
1875 error:
1876 if (jinit_done) { /* kill the commit thread, free journal ram */
1877 journal_release_error(NULL, s);
1878 }
1879
1880 reiserfs_free_bitmap_cache(s);
1881 if (SB_BUFFER_WITH_SB(s))
1882 brelse(SB_BUFFER_WITH_SB(s));
1883 #ifdef CONFIG_QUOTA
1884 {
1885 int j;
1886 for (j = 0; j < MAXQUOTAS; j++)
1887 kfree(qf_names[j]);
1888 }
1889 #endif
1890 kfree(sbi);
1891
1892 s->s_fs_info = NULL;
1893 return errval;
1894 }
1895
1896 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1897 {
1898 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1899
1900 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1901 buf->f_bfree = sb_free_blocks(rs);
1902 buf->f_bavail = buf->f_bfree;
1903 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1904 buf->f_bsize = dentry->d_sb->s_blocksize;
1905 /* changed to accommodate gcc folks. */
1906 buf->f_type = REISERFS_SUPER_MAGIC;
1907 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1908 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1909 sizeof(rs->s_uuid)/2);
1910
1911 return 0;
1912 }
1913
1914 #ifdef CONFIG_QUOTA
1915 static int reiserfs_write_dquot(struct dquot *dquot)
1916 {
1917 struct reiserfs_transaction_handle th;
1918 int ret, err;
1919
1920 reiserfs_write_lock(dquot->dq_sb);
1921 ret =
1922 journal_begin(&th, dquot->dq_sb,
1923 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1924 if (ret)
1925 goto out;
1926 ret = dquot_commit(dquot);
1927 err =
1928 journal_end(&th, dquot->dq_sb,
1929 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1930 if (!ret && err)
1931 ret = err;
1932 out:
1933 reiserfs_write_unlock(dquot->dq_sb);
1934 return ret;
1935 }
1936
1937 static int reiserfs_acquire_dquot(struct dquot *dquot)
1938 {
1939 struct reiserfs_transaction_handle th;
1940 int ret, err;
1941
1942 reiserfs_write_lock(dquot->dq_sb);
1943 ret =
1944 journal_begin(&th, dquot->dq_sb,
1945 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1946 if (ret)
1947 goto out;
1948 ret = dquot_acquire(dquot);
1949 err =
1950 journal_end(&th, dquot->dq_sb,
1951 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1952 if (!ret && err)
1953 ret = err;
1954 out:
1955 reiserfs_write_unlock(dquot->dq_sb);
1956 return ret;
1957 }
1958
1959 static int reiserfs_release_dquot(struct dquot *dquot)
1960 {
1961 struct reiserfs_transaction_handle th;
1962 int ret, err;
1963
1964 reiserfs_write_lock(dquot->dq_sb);
1965 ret =
1966 journal_begin(&th, dquot->dq_sb,
1967 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1968 if (ret) {
1969 /* Release dquot anyway to avoid endless cycle in dqput() */
1970 dquot_release(dquot);
1971 goto out;
1972 }
1973 ret = dquot_release(dquot);
1974 err =
1975 journal_end(&th, dquot->dq_sb,
1976 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1977 if (!ret && err)
1978 ret = err;
1979 out:
1980 reiserfs_write_unlock(dquot->dq_sb);
1981 return ret;
1982 }
1983
1984 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1985 {
1986 /* Are we journaling quotas? */
1987 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1988 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1989 dquot_mark_dquot_dirty(dquot);
1990 return reiserfs_write_dquot(dquot);
1991 } else
1992 return dquot_mark_dquot_dirty(dquot);
1993 }
1994
1995 static int reiserfs_write_info(struct super_block *sb, int type)
1996 {
1997 struct reiserfs_transaction_handle th;
1998 int ret, err;
1999
2000 /* Data block + inode block */
2001 reiserfs_write_lock(sb);
2002 ret = journal_begin(&th, sb, 2);
2003 if (ret)
2004 goto out;
2005 ret = dquot_commit_info(sb, type);
2006 err = journal_end(&th, sb, 2);
2007 if (!ret && err)
2008 ret = err;
2009 out:
2010 reiserfs_write_unlock(sb);
2011 return ret;
2012 }
2013
2014 /*
2015 * Turn on quotas during mount time - we need to find the quota file and such...
2016 */
2017 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2018 {
2019 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2020 REISERFS_SB(sb)->s_jquota_fmt, type);
2021 }
2022
2023 /*
2024 * Standard function to be called on quota_on
2025 */
2026 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2027 char *name, int remount)
2028 {
2029 int err;
2030 struct path path;
2031 struct inode *inode;
2032 struct reiserfs_transaction_handle th;
2033
2034 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2035 return -EINVAL;
2036 /* No more checks needed? Path and format_id are bogus anyway... */
2037 if (remount)
2038 return vfs_quota_on(sb, type, format_id, name, 1);
2039 err = kern_path(name, LOOKUP_FOLLOW, &path);
2040 if (err)
2041 return err;
2042 /* Quotafile not on the same filesystem? */
2043 if (path.mnt->mnt_sb != sb) {
2044 err = -EXDEV;
2045 goto out;
2046 }
2047 inode = path.dentry->d_inode;
2048 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2049 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2050 err = reiserfs_unpack(inode, NULL);
2051 if (err) {
2052 reiserfs_warning(sb, "super-6520",
2053 "Unpacking tail of quota file failed"
2054 " (%d). Cannot turn on quotas.", err);
2055 err = -EINVAL;
2056 goto out;
2057 }
2058 mark_inode_dirty(inode);
2059 }
2060 /* Journaling quota? */
2061 if (REISERFS_SB(sb)->s_qf_names[type]) {
2062 /* Quotafile not of fs root? */
2063 if (path.dentry->d_parent != sb->s_root)
2064 reiserfs_warning(sb, "super-6521",
2065 "Quota file not on filesystem root. "
2066 "Journalled quota will not work.");
2067 }
2068
2069 /*
2070 * When we journal data on quota file, we have to flush journal to see
2071 * all updates to the file when we bypass pagecache...
2072 */
2073 if (reiserfs_file_data_log(inode)) {
2074 /* Just start temporary transaction and finish it */
2075 err = journal_begin(&th, sb, 1);
2076 if (err)
2077 goto out;
2078 err = journal_end_sync(&th, sb, 1);
2079 if (err)
2080 goto out;
2081 }
2082 err = vfs_quota_on_path(sb, type, format_id, &path);
2083 out:
2084 path_put(&path);
2085 return err;
2086 }
2087
2088 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2089 * acquiring the locks... As quota files are never truncated and quota code
2090 * itself serializes the operations (and noone else should touch the files)
2091 * we don't have to be afraid of races */
2092 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2093 size_t len, loff_t off)
2094 {
2095 struct inode *inode = sb_dqopt(sb)->files[type];
2096 unsigned long blk = off >> sb->s_blocksize_bits;
2097 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2098 size_t toread;
2099 struct buffer_head tmp_bh, *bh;
2100 loff_t i_size = i_size_read(inode);
2101
2102 if (off > i_size)
2103 return 0;
2104 if (off + len > i_size)
2105 len = i_size - off;
2106 toread = len;
2107 while (toread > 0) {
2108 tocopy =
2109 sb->s_blocksize - offset <
2110 toread ? sb->s_blocksize - offset : toread;
2111 tmp_bh.b_state = 0;
2112 /* Quota files are without tails so we can safely use this function */
2113 reiserfs_write_lock(sb);
2114 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2115 reiserfs_write_unlock(sb);
2116 if (err)
2117 return err;
2118 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2119 memset(data, 0, tocopy);
2120 else {
2121 bh = sb_bread(sb, tmp_bh.b_blocknr);
2122 if (!bh)
2123 return -EIO;
2124 memcpy(data, bh->b_data + offset, tocopy);
2125 brelse(bh);
2126 }
2127 offset = 0;
2128 toread -= tocopy;
2129 data += tocopy;
2130 blk++;
2131 }
2132 return len;
2133 }
2134
2135 /* Write to quotafile (we know the transaction is already started and has
2136 * enough credits) */
2137 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2138 const char *data, size_t len, loff_t off)
2139 {
2140 struct inode *inode = sb_dqopt(sb)->files[type];
2141 unsigned long blk = off >> sb->s_blocksize_bits;
2142 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2143 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2144 size_t towrite = len;
2145 struct buffer_head tmp_bh, *bh;
2146
2147 if (!current->journal_info) {
2148 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2149 " cancelled because transaction is not started.\n",
2150 (unsigned long long)off, (unsigned long long)len);
2151 return -EIO;
2152 }
2153 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2154 while (towrite > 0) {
2155 tocopy = sb->s_blocksize - offset < towrite ?
2156 sb->s_blocksize - offset : towrite;
2157 tmp_bh.b_state = 0;
2158 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2159 if (err)
2160 goto out;
2161 if (offset || tocopy != sb->s_blocksize)
2162 bh = sb_bread(sb, tmp_bh.b_blocknr);
2163 else
2164 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2165 if (!bh) {
2166 err = -EIO;
2167 goto out;
2168 }
2169 lock_buffer(bh);
2170 memcpy(bh->b_data + offset, data, tocopy);
2171 flush_dcache_page(bh->b_page);
2172 set_buffer_uptodate(bh);
2173 unlock_buffer(bh);
2174 reiserfs_prepare_for_journal(sb, bh, 1);
2175 journal_mark_dirty(current->journal_info, sb, bh);
2176 if (!journal_quota)
2177 reiserfs_add_ordered_list(inode, bh);
2178 brelse(bh);
2179 offset = 0;
2180 towrite -= tocopy;
2181 data += tocopy;
2182 blk++;
2183 }
2184 out:
2185 if (len == towrite) {
2186 mutex_unlock(&inode->i_mutex);
2187 return err;
2188 }
2189 if (inode->i_size < off + len - towrite)
2190 i_size_write(inode, off + len - towrite);
2191 inode->i_version++;
2192 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2193 mark_inode_dirty(inode);
2194 mutex_unlock(&inode->i_mutex);
2195 return len - towrite;
2196 }
2197
2198 #endif
2199
2200 static int get_super_block(struct file_system_type *fs_type,
2201 int flags, const char *dev_name,
2202 void *data, struct vfsmount *mnt)
2203 {
2204 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2205 mnt);
2206 }
2207
2208 static int __init init_reiserfs_fs(void)
2209 {
2210 int ret;
2211
2212 if ((ret = init_inodecache())) {
2213 return ret;
2214 }
2215
2216 reiserfs_proc_info_global_init();
2217 reiserfs_proc_register_global("version",
2218 reiserfs_global_version_in_proc);
2219
2220 ret = register_filesystem(&reiserfs_fs_type);
2221
2222 if (ret == 0) {
2223 return 0;
2224 }
2225
2226 reiserfs_proc_unregister_global("version");
2227 reiserfs_proc_info_global_done();
2228 destroy_inodecache();
2229
2230 return ret;
2231 }
2232
2233 static void __exit exit_reiserfs_fs(void)
2234 {
2235 reiserfs_proc_unregister_global("version");
2236 reiserfs_proc_info_global_done();
2237 unregister_filesystem(&reiserfs_fs_type);
2238 destroy_inodecache();
2239 }
2240
2241 struct file_system_type reiserfs_fs_type = {
2242 .owner = THIS_MODULE,
2243 .name = "reiserfs",
2244 .get_sb = get_super_block,
2245 .kill_sb = reiserfs_kill_sb,
2246 .fs_flags = FS_REQUIRES_DEV,
2247 };
2248
2249 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2250 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2251 MODULE_LICENSE("GPL");
2252
2253 module_init(init_reiserfs_fs);
2254 module_exit(exit_reiserfs_fs);
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