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vmscan: handle may_swap more strictly
[linux-2.6/cjktty.git] / fs / reiserfs / super.c
blob2969773cfc22abb000e2eceb90f0011ef0fd2f34
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 #include <linux/smp_lock.h>
32
33 struct file_system_type reiserfs_fs_type;
34
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42 strlen(reiserfs_3_5_magic_string));
43 }
44
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48 strlen(reiserfs_3_6_magic_string));
49 }
50
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54 strlen(reiserfs_jr_magic_string));
55 }
56
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60 is_reiserfs_jr(rs));
61 }
62
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68 struct reiserfs_transaction_handle th;
69
70 reiserfs_write_lock(s);
71 if (!journal_begin(&th, s, 1))
72 if (!journal_end_sync(&th, s, 1))
73 reiserfs_flush_old_commits(s);
74 s->s_dirt = 0; /* Even if it's not true.
75 * We'll loop forever in sync_supers otherwise */
76 reiserfs_write_unlock(s);
77 return 0;
78 }
79
80 static void reiserfs_write_super(struct super_block *s)
81 {
82 reiserfs_sync_fs(s, 1);
83 }
84
85 static int reiserfs_freeze(struct super_block *s)
86 {
87 struct reiserfs_transaction_handle th;
88 reiserfs_write_lock(s);
89 if (!(s->s_flags & MS_RDONLY)) {
90 int err = journal_begin(&th, s, 1);
91 if (err) {
92 reiserfs_block_writes(&th);
93 } else {
94 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
95 1);
96 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
97 reiserfs_block_writes(&th);
98 journal_end_sync(&th, s, 1);
99 }
100 }
101 s->s_dirt = 0;
102 reiserfs_write_unlock(s);
103 return 0;
104 }
105
106 static int reiserfs_unfreeze(struct super_block *s)
107 {
108 reiserfs_allow_writes(s);
109 return 0;
110 }
111
112 extern const struct in_core_key MAX_IN_CORE_KEY;
113
114 /* this is used to delete "save link" when there are no items of a
115 file it points to. It can either happen if unlink is completed but
116 "save unlink" removal, or if file has both unlink and truncate
117 pending and as unlink completes first (because key of "save link"
118 protecting unlink is bigger that a key lf "save link" which
119 protects truncate), so there left no items to make truncate
120 completion on */
121 static int remove_save_link_only(struct super_block *s,
122 struct reiserfs_key *key, int oid_free)
123 {
124 struct reiserfs_transaction_handle th;
125 int err;
126
127 /* we are going to do one balancing */
128 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
129 if (err)
130 return err;
131
132 reiserfs_delete_solid_item(&th, NULL, key);
133 if (oid_free)
134 /* removals are protected by direct items */
135 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
136
137 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
138 }
139
140 #ifdef CONFIG_QUOTA
141 static int reiserfs_quota_on_mount(struct super_block *, int);
142 #endif
143
144 /* look for uncompleted unlinks and truncates and complete them */
145 static int finish_unfinished(struct super_block *s)
146 {
147 INITIALIZE_PATH(path);
148 struct cpu_key max_cpu_key, obj_key;
149 struct reiserfs_key save_link_key, last_inode_key;
150 int retval = 0;
151 struct item_head *ih;
152 struct buffer_head *bh;
153 int item_pos;
154 char *item;
155 int done;
156 struct inode *inode;
157 int truncate;
158 #ifdef CONFIG_QUOTA
159 int i;
160 int ms_active_set;
161 #endif
162
163 /* compose key to look for "save" links */
164 max_cpu_key.version = KEY_FORMAT_3_5;
165 max_cpu_key.on_disk_key.k_dir_id = ~0U;
166 max_cpu_key.on_disk_key.k_objectid = ~0U;
167 set_cpu_key_k_offset(&max_cpu_key, ~0U);
168 max_cpu_key.key_length = 3;
169
170 memset(&last_inode_key, 0, sizeof(last_inode_key));
171
172 #ifdef CONFIG_QUOTA
173 /* Needed for iput() to work correctly and not trash data */
174 if (s->s_flags & MS_ACTIVE) {
175 ms_active_set = 0;
176 } else {
177 ms_active_set = 1;
178 s->s_flags |= MS_ACTIVE;
179 }
180 /* Turn on quotas so that they are updated correctly */
181 for (i = 0; i < MAXQUOTAS; i++) {
182 if (REISERFS_SB(s)->s_qf_names[i]) {
183 int ret = reiserfs_quota_on_mount(s, i);
184 if (ret < 0)
185 reiserfs_warning(s, "reiserfs-2500",
186 "cannot turn on journaled "
187 "quota: error %d", ret);
188 }
189 }
190 #endif
191
192 done = 0;
193 REISERFS_SB(s)->s_is_unlinked_ok = 1;
194 while (!retval) {
195 retval = search_item(s, &max_cpu_key, &path);
196 if (retval != ITEM_NOT_FOUND) {
197 reiserfs_error(s, "vs-2140",
198 "search_by_key returned %d", retval);
199 break;
200 }
201
202 bh = get_last_bh(&path);
203 item_pos = get_item_pos(&path);
204 if (item_pos != B_NR_ITEMS(bh)) {
205 reiserfs_warning(s, "vs-2060",
206 "wrong position found");
207 break;
208 }
209 item_pos--;
210 ih = B_N_PITEM_HEAD(bh, item_pos);
211
212 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
213 /* there are no "save" links anymore */
214 break;
215
216 save_link_key = ih->ih_key;
217 if (is_indirect_le_ih(ih))
218 truncate = 1;
219 else
220 truncate = 0;
221
222 /* reiserfs_iget needs k_dirid and k_objectid only */
223 item = B_I_PITEM(bh, ih);
224 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
225 obj_key.on_disk_key.k_objectid =
226 le32_to_cpu(ih->ih_key.k_objectid);
227 obj_key.on_disk_key.k_offset = 0;
228 obj_key.on_disk_key.k_type = 0;
229
230 pathrelse(&path);
231
232 inode = reiserfs_iget(s, &obj_key);
233 if (!inode) {
234 /* the unlink almost completed, it just did not manage to remove
235 "save" link and release objectid */
236 reiserfs_warning(s, "vs-2180", "iget failed for %K",
237 &obj_key);
238 retval = remove_save_link_only(s, &save_link_key, 1);
239 continue;
240 }
241
242 if (!truncate && inode->i_nlink) {
243 /* file is not unlinked */
244 reiserfs_warning(s, "vs-2185",
245 "file %K is not unlinked",
246 &obj_key);
247 retval = remove_save_link_only(s, &save_link_key, 0);
248 continue;
249 }
250 vfs_dq_init(inode);
251
252 if (truncate && S_ISDIR(inode->i_mode)) {
253 /* We got a truncate request for a dir which is impossible.
254 The only imaginable way is to execute unfinished truncate request
255 then boot into old kernel, remove the file and create dir with
256 the same key. */
257 reiserfs_warning(s, "green-2101",
258 "impossible truncate on a "
259 "directory %k. Please report",
260 INODE_PKEY(inode));
261 retval = remove_save_link_only(s, &save_link_key, 0);
262 truncate = 0;
263 iput(inode);
264 continue;
265 }
266
267 if (truncate) {
268 REISERFS_I(inode)->i_flags |=
269 i_link_saved_truncate_mask;
270 /* not completed truncate found. New size was committed together
271 with "save" link */
272 reiserfs_info(s, "Truncating %k to %Ld ..",
273 INODE_PKEY(inode), inode->i_size);
274 reiserfs_truncate_file(inode,
275 0
276 /*don't update modification time */
277 );
278 retval = remove_save_link(inode, truncate);
279 } else {
280 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
281 /* not completed unlink (rmdir) found */
282 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
283 if (memcmp(&last_inode_key, INODE_PKEY(inode),
284 sizeof(last_inode_key))){
285 last_inode_key = *INODE_PKEY(inode);
286 /* removal gets completed in iput */
287 retval = 0;
288 } else {
289 reiserfs_warning(s, "super-2189", "Dead loop "
290 "in finish_unfinished "
291 "detected, just remove "
292 "save link\n");
293 retval = remove_save_link_only(s,
294 &save_link_key, 0);
295 }
296 }
297
298 iput(inode);
299 printk("done\n");
300 done++;
301 }
302 REISERFS_SB(s)->s_is_unlinked_ok = 0;
303
304 #ifdef CONFIG_QUOTA
305 /* Turn quotas off */
306 for (i = 0; i < MAXQUOTAS; i++) {
307 if (sb_dqopt(s)->files[i])
308 vfs_quota_off(s, i, 0);
309 }
310 if (ms_active_set)
311 /* Restore the flag back */
312 s->s_flags &= ~MS_ACTIVE;
313 #endif
314 pathrelse(&path);
315 if (done)
316 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
317 "Completed\n", done);
318 return retval;
319 }
320
321 /* to protect file being unlinked from getting lost we "safe" link files
322 being unlinked. This link will be deleted in the same transaction with last
323 item of file. mounting the filesystem we scan all these links and remove
324 files which almost got lost */
325 void add_save_link(struct reiserfs_transaction_handle *th,
326 struct inode *inode, int truncate)
327 {
328 INITIALIZE_PATH(path);
329 int retval;
330 struct cpu_key key;
331 struct item_head ih;
332 __le32 link;
333
334 BUG_ON(!th->t_trans_id);
335
336 /* file can only get one "save link" of each kind */
337 RFALSE(truncate &&
338 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
339 "saved link already exists for truncated inode %lx",
340 (long)inode->i_ino);
341 RFALSE(!truncate &&
342 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
343 "saved link already exists for unlinked inode %lx",
344 (long)inode->i_ino);
345
346 /* setup key of "save" link */
347 key.version = KEY_FORMAT_3_5;
348 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
349 key.on_disk_key.k_objectid = inode->i_ino;
350 if (!truncate) {
351 /* unlink, rmdir, rename */
352 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
353 set_cpu_key_k_type(&key, TYPE_DIRECT);
354
355 /* item head of "safe" link */
356 make_le_item_head(&ih, &key, key.version,
357 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
358 4 /*length */ , 0xffff /*free space */ );
359 } else {
360 /* truncate */
361 if (S_ISDIR(inode->i_mode))
362 reiserfs_warning(inode->i_sb, "green-2102",
363 "Adding a truncate savelink for "
364 "a directory %k! Please report",
365 INODE_PKEY(inode));
366 set_cpu_key_k_offset(&key, 1);
367 set_cpu_key_k_type(&key, TYPE_INDIRECT);
368
369 /* item head of "safe" link */
370 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
371 4 /*length */ , 0 /*free space */ );
372 }
373 key.key_length = 3;
374
375 /* look for its place in the tree */
376 retval = search_item(inode->i_sb, &key, &path);
377 if (retval != ITEM_NOT_FOUND) {
378 if (retval != -ENOSPC)
379 reiserfs_error(inode->i_sb, "vs-2100",
380 "search_by_key (%K) returned %d", &key,
381 retval);
382 pathrelse(&path);
383 return;
384 }
385
386 /* body of "save" link */
387 link = INODE_PKEY(inode)->k_dir_id;
388
389 /* put "save" link inot tree, don't charge quota to anyone */
390 retval =
391 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
392 if (retval) {
393 if (retval != -ENOSPC)
394 reiserfs_error(inode->i_sb, "vs-2120",
395 "insert_item returned %d", retval);
396 } else {
397 if (truncate)
398 REISERFS_I(inode)->i_flags |=
399 i_link_saved_truncate_mask;
400 else
401 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
402 }
403 }
404
405 /* this opens transaction unlike add_save_link */
406 int remove_save_link(struct inode *inode, int truncate)
407 {
408 struct reiserfs_transaction_handle th;
409 struct reiserfs_key key;
410 int err;
411
412 /* we are going to do one balancing only */
413 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
414 if (err)
415 return err;
416
417 /* setup key of "save" link */
418 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
419 key.k_objectid = INODE_PKEY(inode)->k_objectid;
420 if (!truncate) {
421 /* unlink, rmdir, rename */
422 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
423 1 + inode->i_sb->s_blocksize);
424 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
425 } else {
426 /* truncate */
427 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
428 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
429 }
430
431 if ((truncate &&
432 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
433 (!truncate &&
434 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
435 /* don't take quota bytes from anywhere */
436 reiserfs_delete_solid_item(&th, NULL, &key);
437 if (!truncate) {
438 reiserfs_release_objectid(&th, inode->i_ino);
439 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
440 } else
441 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
442
443 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
444 }
445
446 static void reiserfs_kill_sb(struct super_block *s)
447 {
448 if (REISERFS_SB(s)) {
449 if (REISERFS_SB(s)->xattr_root) {
450 d_invalidate(REISERFS_SB(s)->xattr_root);
451 dput(REISERFS_SB(s)->xattr_root);
452 REISERFS_SB(s)->xattr_root = NULL;
453 }
454 if (REISERFS_SB(s)->priv_root) {
455 d_invalidate(REISERFS_SB(s)->priv_root);
456 dput(REISERFS_SB(s)->priv_root);
457 REISERFS_SB(s)->priv_root = NULL;
458 }
459 }
460
461 kill_block_super(s);
462 }
463
464 static void reiserfs_put_super(struct super_block *s)
465 {
466 struct reiserfs_transaction_handle th;
467 th.t_trans_id = 0;
468
469 lock_kernel();
470
471 if (s->s_dirt)
472 reiserfs_write_super(s);
473
474 /* change file system state to current state if it was mounted with read-write permissions */
475 if (!(s->s_flags & MS_RDONLY)) {
476 if (!journal_begin(&th, s, 10)) {
477 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
478 1);
479 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
480 REISERFS_SB(s)->s_mount_state);
481 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
482 }
483 }
484
485 /* note, journal_release checks for readonly mount, and can decide not
486 ** to do a journal_end
487 */
488 journal_release(&th, s);
489
490 reiserfs_free_bitmap_cache(s);
491
492 brelse(SB_BUFFER_WITH_SB(s));
493
494 print_statistics(s);
495
496 if (REISERFS_SB(s)->reserved_blocks != 0) {
497 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
498 REISERFS_SB(s)->reserved_blocks);
499 }
500
501 reiserfs_proc_info_done(s);
502
503 kfree(s->s_fs_info);
504 s->s_fs_info = NULL;
505
506 unlock_kernel();
507 }
508
509 static struct kmem_cache *reiserfs_inode_cachep;
510
511 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
512 {
513 struct reiserfs_inode_info *ei;
514 ei = (struct reiserfs_inode_info *)
515 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
516 if (!ei)
517 return NULL;
518 return &ei->vfs_inode;
519 }
520
521 static void reiserfs_destroy_inode(struct inode *inode)
522 {
523 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
524 }
525
526 static void init_once(void *foo)
527 {
528 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
529
530 INIT_LIST_HEAD(&ei->i_prealloc_list);
531 inode_init_once(&ei->vfs_inode);
532 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
533 ei->i_acl_access = NULL;
534 ei->i_acl_default = NULL;
535 #endif
536 }
537
538 static int init_inodecache(void)
539 {
540 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
541 sizeof(struct
542 reiserfs_inode_info),
543 0, (SLAB_RECLAIM_ACCOUNT|
544 SLAB_MEM_SPREAD),
545 init_once);
546 if (reiserfs_inode_cachep == NULL)
547 return -ENOMEM;
548 return 0;
549 }
550
551 static void destroy_inodecache(void)
552 {
553 kmem_cache_destroy(reiserfs_inode_cachep);
554 }
555
556 /* we don't mark inodes dirty, we just log them */
557 static void reiserfs_dirty_inode(struct inode *inode)
558 {
559 struct reiserfs_transaction_handle th;
560
561 int err = 0;
562 if (inode->i_sb->s_flags & MS_RDONLY) {
563 reiserfs_warning(inode->i_sb, "clm-6006",
564 "writing inode %lu on readonly FS",
565 inode->i_ino);
566 return;
567 }
568 reiserfs_write_lock(inode->i_sb);
569
570 /* this is really only used for atime updates, so they don't have
571 ** to be included in O_SYNC or fsync
572 */
573 err = journal_begin(&th, inode->i_sb, 1);
574 if (err) {
575 reiserfs_write_unlock(inode->i_sb);
576 return;
577 }
578 reiserfs_update_sd(&th, inode);
579 journal_end(&th, inode->i_sb, 1);
580 reiserfs_write_unlock(inode->i_sb);
581 }
582
583 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
584 static void reiserfs_clear_inode(struct inode *inode)
585 {
586 struct posix_acl *acl;
587
588 acl = REISERFS_I(inode)->i_acl_access;
589 if (acl && !IS_ERR(acl))
590 posix_acl_release(acl);
591 REISERFS_I(inode)->i_acl_access = NULL;
592
593 acl = REISERFS_I(inode)->i_acl_default;
594 if (acl && !IS_ERR(acl))
595 posix_acl_release(acl);
596 REISERFS_I(inode)->i_acl_default = NULL;
597 }
598 #else
599 #define reiserfs_clear_inode NULL
600 #endif
601
602 #ifdef CONFIG_QUOTA
603 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
604 size_t, loff_t);
605 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
606 loff_t);
607 #endif
608
609 static const struct super_operations reiserfs_sops = {
610 .alloc_inode = reiserfs_alloc_inode,
611 .destroy_inode = reiserfs_destroy_inode,
612 .write_inode = reiserfs_write_inode,
613 .dirty_inode = reiserfs_dirty_inode,
614 .delete_inode = reiserfs_delete_inode,
615 .clear_inode = reiserfs_clear_inode,
616 .put_super = reiserfs_put_super,
617 .write_super = reiserfs_write_super,
618 .sync_fs = reiserfs_sync_fs,
619 .freeze_fs = reiserfs_freeze,
620 .unfreeze_fs = reiserfs_unfreeze,
621 .statfs = reiserfs_statfs,
622 .remount_fs = reiserfs_remount,
623 .show_options = generic_show_options,
624 #ifdef CONFIG_QUOTA
625 .quota_read = reiserfs_quota_read,
626 .quota_write = reiserfs_quota_write,
627 #endif
628 };
629
630 #ifdef CONFIG_QUOTA
631 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
632
633 static int reiserfs_write_dquot(struct dquot *);
634 static int reiserfs_acquire_dquot(struct dquot *);
635 static int reiserfs_release_dquot(struct dquot *);
636 static int reiserfs_mark_dquot_dirty(struct dquot *);
637 static int reiserfs_write_info(struct super_block *, int);
638 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
639
640 static struct dquot_operations reiserfs_quota_operations = {
641 .initialize = dquot_initialize,
642 .drop = dquot_drop,
643 .alloc_space = dquot_alloc_space,
644 .alloc_inode = dquot_alloc_inode,
645 .free_space = dquot_free_space,
646 .free_inode = dquot_free_inode,
647 .transfer = dquot_transfer,
648 .write_dquot = reiserfs_write_dquot,
649 .acquire_dquot = reiserfs_acquire_dquot,
650 .release_dquot = reiserfs_release_dquot,
651 .mark_dirty = reiserfs_mark_dquot_dirty,
652 .write_info = reiserfs_write_info,
653 .alloc_dquot = dquot_alloc,
654 .destroy_dquot = dquot_destroy,
655 };
656
657 static struct quotactl_ops reiserfs_qctl_operations = {
658 .quota_on = reiserfs_quota_on,
659 .quota_off = vfs_quota_off,
660 .quota_sync = vfs_quota_sync,
661 .get_info = vfs_get_dqinfo,
662 .set_info = vfs_set_dqinfo,
663 .get_dqblk = vfs_get_dqblk,
664 .set_dqblk = vfs_set_dqblk,
665 };
666 #endif
667
668 static const struct export_operations reiserfs_export_ops = {
669 .encode_fh = reiserfs_encode_fh,
670 .fh_to_dentry = reiserfs_fh_to_dentry,
671 .fh_to_parent = reiserfs_fh_to_parent,
672 .get_parent = reiserfs_get_parent,
673 };
674
675 /* this struct is used in reiserfs_getopt () for containing the value for those
676 mount options that have values rather than being toggles. */
677 typedef struct {
678 char *value;
679 int setmask; /* bitmask which is to set on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. */
681 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
682 value is found, 0 is no bits are to be changed. This is
683 applied BEFORE setmask */
684 } arg_desc_t;
685
686 /* Set this bit in arg_required to allow empty arguments */
687 #define REISERFS_OPT_ALLOWEMPTY 31
688
689 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
690 mount options */
691 typedef struct {
692 char *option_name;
693 int arg_required; /* 0 if argument is not required, not 0 otherwise */
694 const arg_desc_t *values; /* list of values accepted by an option */
695 int setmask; /* bitmask which is to set on mount_options bitmask when this
696 value is found, 0 is no bits are to be changed. */
697 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
698 value is found, 0 is no bits are to be changed. This is
699 applied BEFORE setmask */
700 } opt_desc_t;
701
702 /* possible values for -o data= */
703 static const arg_desc_t logging_mode[] = {
704 {"ordered", 1 << REISERFS_DATA_ORDERED,
705 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
706 {"journal", 1 << REISERFS_DATA_LOG,
707 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
708 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
709 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
710 {.value = NULL}
711 };
712
713 /* possible values for -o barrier= */
714 static const arg_desc_t barrier_mode[] = {
715 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
716 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
717 {.value = NULL}
718 };
719
720 /* possible values for "-o block-allocator=" and bits which are to be set in
721 s_mount_opt of reiserfs specific part of in-core super block */
722 static const arg_desc_t balloc[] = {
723 {"noborder", 1 << REISERFS_NO_BORDER, 0},
724 {"border", 0, 1 << REISERFS_NO_BORDER},
725 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
726 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
727 {"test4", 1 << REISERFS_TEST4, 0},
728 {"notest4", 0, 1 << REISERFS_TEST4},
729 {NULL, 0, 0}
730 };
731
732 static const arg_desc_t tails[] = {
733 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
734 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
735 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
736 {NULL, 0, 0}
737 };
738
739 static const arg_desc_t error_actions[] = {
740 {"panic", 1 << REISERFS_ERROR_PANIC,
741 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
742 {"ro-remount", 1 << REISERFS_ERROR_RO,
743 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
744 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
745 {"continue", 1 << REISERFS_ERROR_CONTINUE,
746 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
747 #endif
748 {NULL, 0, 0},
749 };
750
751 /* proceed only one option from a list *cur - string containing of mount options
752 opts - array of options which are accepted
753 opt_arg - if option is found and requires an argument and if it is specifed
754 in the input - pointer to the argument is stored here
755 bit_flags - if option requires to set a certain bit - it is set here
756 return -1 if unknown option is found, opt->arg_required otherwise */
757 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
758 char **opt_arg, unsigned long *bit_flags)
759 {
760 char *p;
761 /* foo=bar,
762 ^ ^ ^
763 | | +-- option_end
764 | +-- arg_start
765 +-- option_start
766 */
767 const opt_desc_t *opt;
768 const arg_desc_t *arg;
769
770 p = *cur;
771
772 /* assume argument cannot contain commas */
773 *cur = strchr(p, ',');
774 if (*cur) {
775 *(*cur) = '\0';
776 (*cur)++;
777 }
778
779 if (!strncmp(p, "alloc=", 6)) {
780 /* Ugly special case, probably we should redo options parser so that
781 it can understand several arguments for some options, also so that
782 it can fill several bitfields with option values. */
783 if (reiserfs_parse_alloc_options(s, p + 6)) {
784 return -1;
785 } else {
786 return 0;
787 }
788 }
789
790 /* for every option in the list */
791 for (opt = opts; opt->option_name; opt++) {
792 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
793 if (bit_flags) {
794 if (opt->clrmask ==
795 (1 << REISERFS_UNSUPPORTED_OPT))
796 reiserfs_warning(s, "super-6500",
797 "%s not supported.\n",
798 p);
799 else
800 *bit_flags &= ~opt->clrmask;
801 if (opt->setmask ==
802 (1 << REISERFS_UNSUPPORTED_OPT))
803 reiserfs_warning(s, "super-6501",
804 "%s not supported.\n",
805 p);
806 else
807 *bit_flags |= opt->setmask;
808 }
809 break;
810 }
811 }
812 if (!opt->option_name) {
813 reiserfs_warning(s, "super-6502",
814 "unknown mount option \"%s\"", p);
815 return -1;
816 }
817
818 p += strlen(opt->option_name);
819 switch (*p) {
820 case '=':
821 if (!opt->arg_required) {
822 reiserfs_warning(s, "super-6503",
823 "the option \"%s\" does not "
824 "require an argument\n",
825 opt->option_name);
826 return -1;
827 }
828 break;
829
830 case 0:
831 if (opt->arg_required) {
832 reiserfs_warning(s, "super-6504",
833 "the option \"%s\" requires an "
834 "argument\n", opt->option_name);
835 return -1;
836 }
837 break;
838 default:
839 reiserfs_warning(s, "super-6505",
840 "head of option \"%s\" is only correct\n",
841 opt->option_name);
842 return -1;
843 }
844
845 /* move to the argument, or to next option if argument is not required */
846 p++;
847
848 if (opt->arg_required
849 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
850 && !strlen(p)) {
851 /* this catches "option=," if not allowed */
852 reiserfs_warning(s, "super-6506",
853 "empty argument for \"%s\"\n",
854 opt->option_name);
855 return -1;
856 }
857
858 if (!opt->values) {
859 /* *=NULLopt_arg contains pointer to argument */
860 *opt_arg = p;
861 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
862 }
863
864 /* values possible for this option are listed in opt->values */
865 for (arg = opt->values; arg->value; arg++) {
866 if (!strcmp(p, arg->value)) {
867 if (bit_flags) {
868 *bit_flags &= ~arg->clrmask;
869 *bit_flags |= arg->setmask;
870 }
871 return opt->arg_required;
872 }
873 }
874
875 reiserfs_warning(s, "super-6506",
876 "bad value \"%s\" for option \"%s\"\n", p,
877 opt->option_name);
878 return -1;
879 }
880
881 /* returns 0 if something is wrong in option string, 1 - otherwise */
882 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
883 unsigned long *mount_options,
884 /* after the parsing phase, contains the
885 collection of bitflags defining what
886 mount options were selected. */
887 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
888 char **jdev_name,
889 unsigned int *commit_max_age,
890 char **qf_names,
891 unsigned int *qfmt)
892 {
893 int c;
894 char *arg = NULL;
895 char *pos;
896 opt_desc_t opts[] = {
897 /* Compatibility stuff, so that -o notail for old setups still work */
898 {"tails",.arg_required = 't',.values = tails},
899 {"notail",.clrmask =
900 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
901 {"conv",.setmask = 1 << REISERFS_CONVERT},
902 {"attrs",.setmask = 1 << REISERFS_ATTRS},
903 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
904 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
905 #ifdef CONFIG_REISERFS_FS_XATTR
906 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
907 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
908 #else
909 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
910 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
911 #endif
912 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
913 {"acl",.setmask = 1 << REISERFS_POSIXACL},
914 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
915 #else
916 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
917 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
918 #endif
919 {.option_name = "nolog"},
920 {"replayonly",.setmask = 1 << REPLAYONLY},
921 {"block-allocator",.arg_required = 'a',.values = balloc},
922 {"data",.arg_required = 'd',.values = logging_mode},
923 {"barrier",.arg_required = 'b',.values = barrier_mode},
924 {"resize",.arg_required = 'r',.values = NULL},
925 {"jdev",.arg_required = 'j',.values = NULL},
926 {"nolargeio",.arg_required = 'w',.values = NULL},
927 {"commit",.arg_required = 'c',.values = NULL},
928 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
929 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
930 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
931 {"errors",.arg_required = 'e',.values = error_actions},
932 {"usrjquota",.arg_required =
933 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
934 {"grpjquota",.arg_required =
935 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
936 {"jqfmt",.arg_required = 'f',.values = NULL},
937 {.option_name = NULL}
938 };
939
940 *blocks = 0;
941 if (!options || !*options)
942 /* use default configuration: create tails, journaling on, no
943 conversion to newest format */
944 return 1;
945
946 for (pos = options; pos;) {
947 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
948 if (c == -1)
949 /* wrong option is given */
950 return 0;
951
952 if (c == 'r') {
953 char *p;
954
955 p = NULL;
956 /* "resize=NNN" or "resize=auto" */
957
958 if (!strcmp(arg, "auto")) {
959 /* From JFS code, to auto-get the size. */
960 *blocks =
961 s->s_bdev->bd_inode->i_size >> s->
962 s_blocksize_bits;
963 } else {
964 *blocks = simple_strtoul(arg, &p, 0);
965 if (*p != '\0') {
966 /* NNN does not look like a number */
967 reiserfs_warning(s, "super-6507",
968 "bad value %s for "
969 "-oresize\n", arg);
970 return 0;
971 }
972 }
973 }
974
975 if (c == 'c') {
976 char *p = NULL;
977 unsigned long val = simple_strtoul(arg, &p, 0);
978 /* commit=NNN (time in seconds) */
979 if (*p != '\0' || val >= (unsigned int)-1) {
980 reiserfs_warning(s, "super-6508",
981 "bad value %s for -ocommit\n",
982 arg);
983 return 0;
984 }
985 *commit_max_age = (unsigned int)val;
986 }
987
988 if (c == 'w') {
989 reiserfs_warning(s, "super-6509", "nolargeio option "
990 "is no longer supported");
991 return 0;
992 }
993
994 if (c == 'j') {
995 if (arg && *arg && jdev_name) {
996 if (*jdev_name) { //Hm, already assigned?
997 reiserfs_warning(s, "super-6510",
998 "journal device was "
999 "already specified to "
1000 "be %s", *jdev_name);
1001 return 0;
1002 }
1003 *jdev_name = arg;
1004 }
1005 }
1006 #ifdef CONFIG_QUOTA
1007 if (c == 'u' || c == 'g') {
1008 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1009
1010 if (sb_any_quota_loaded(s) &&
1011 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1012 reiserfs_warning(s, "super-6511",
1013 "cannot change journaled "
1014 "quota options when quota "
1015 "turned on.");
1016 return 0;
1017 }
1018 if (*arg) { /* Some filename specified? */
1019 if (REISERFS_SB(s)->s_qf_names[qtype]
1020 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1021 arg)) {
1022 reiserfs_warning(s, "super-6512",
1023 "%s quota file "
1024 "already specified.",
1025 QTYPE2NAME(qtype));
1026 return 0;
1027 }
1028 if (strchr(arg, '/')) {
1029 reiserfs_warning(s, "super-6513",
1030 "quotafile must be "
1031 "on filesystem root.");
1032 return 0;
1033 }
1034 qf_names[qtype] =
1035 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1036 if (!qf_names[qtype]) {
1037 reiserfs_warning(s, "reiserfs-2502",
1038 "not enough memory "
1039 "for storing "
1040 "quotafile name.");
1041 return 0;
1042 }
1043 strcpy(qf_names[qtype], arg);
1044 *mount_options |= 1 << REISERFS_QUOTA;
1045 } else {
1046 if (qf_names[qtype] !=
1047 REISERFS_SB(s)->s_qf_names[qtype])
1048 kfree(qf_names[qtype]);
1049 qf_names[qtype] = NULL;
1050 }
1051 }
1052 if (c == 'f') {
1053 if (!strcmp(arg, "vfsold"))
1054 *qfmt = QFMT_VFS_OLD;
1055 else if (!strcmp(arg, "vfsv0"))
1056 *qfmt = QFMT_VFS_V0;
1057 else {
1058 reiserfs_warning(s, "super-6514",
1059 "unknown quota format "
1060 "specified.");
1061 return 0;
1062 }
1063 if (sb_any_quota_loaded(s) &&
1064 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1065 reiserfs_warning(s, "super-6515",
1066 "cannot change journaled "
1067 "quota options when quota "
1068 "turned on.");
1069 return 0;
1070 }
1071 }
1072 #else
1073 if (c == 'u' || c == 'g' || c == 'f') {
1074 reiserfs_warning(s, "reiserfs-2503", "journaled "
1075 "quota options not supported.");
1076 return 0;
1077 }
1078 #endif
1079 }
1080
1081 #ifdef CONFIG_QUOTA
1082 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1083 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1084 reiserfs_warning(s, "super-6515",
1085 "journaled quota format not specified.");
1086 return 0;
1087 }
1088 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1089 if (!(*mount_options & (1 << REISERFS_QUOTA))
1090 && sb_any_quota_loaded(s)) {
1091 reiserfs_warning(s, "super-6516", "quota options must "
1092 "be present when quota is turned on.");
1093 return 0;
1094 }
1095 #endif
1096
1097 return 1;
1098 }
1099
1100 static void switch_data_mode(struct super_block *s, unsigned long mode)
1101 {
1102 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1103 (1 << REISERFS_DATA_ORDERED) |
1104 (1 << REISERFS_DATA_WRITEBACK));
1105 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1106 }
1107
1108 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1109 {
1110 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1111 if (!reiserfs_data_log(s)) {
1112 switch_data_mode(s, REISERFS_DATA_LOG);
1113 reiserfs_info(s, "switching to journaled data mode\n");
1114 }
1115 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1116 if (!reiserfs_data_ordered(s)) {
1117 switch_data_mode(s, REISERFS_DATA_ORDERED);
1118 reiserfs_info(s, "switching to ordered data mode\n");
1119 }
1120 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1121 if (!reiserfs_data_writeback(s)) {
1122 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1123 reiserfs_info(s, "switching to writeback data mode\n");
1124 }
1125 }
1126 }
1127
1128 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1129 {
1130 int flush = (1 << REISERFS_BARRIER_FLUSH);
1131 int none = (1 << REISERFS_BARRIER_NONE);
1132 int all_barrier = flush | none;
1133
1134 if (bits & all_barrier) {
1135 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1136 if (bits & flush) {
1137 REISERFS_SB(s)->s_mount_opt |= flush;
1138 printk("reiserfs: enabling write barrier flush mode\n");
1139 } else if (bits & none) {
1140 REISERFS_SB(s)->s_mount_opt |= none;
1141 printk("reiserfs: write barriers turned off\n");
1142 }
1143 }
1144 }
1145
1146 static void handle_attrs(struct super_block *s)
1147 {
1148 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1149
1150 if (reiserfs_attrs(s)) {
1151 if (old_format_only(s)) {
1152 reiserfs_warning(s, "super-6517", "cannot support "
1153 "attributes on 3.5.x disk format");
1154 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1155 return;
1156 }
1157 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1158 reiserfs_warning(s, "super-6518", "cannot support "
1159 "attributes until flag is set in "
1160 "super-block");
1161 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1162 }
1163 }
1164 }
1165
1166 #ifdef CONFIG_QUOTA
1167 static void handle_quota_files(struct super_block *s, char **qf_names,
1168 unsigned int *qfmt)
1169 {
1170 int i;
1171
1172 for (i = 0; i < MAXQUOTAS; i++) {
1173 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1174 kfree(REISERFS_SB(s)->s_qf_names[i]);
1175 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1176 }
1177 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1178 }
1179 #endif
1180
1181 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1182 {
1183 struct reiserfs_super_block *rs;
1184 struct reiserfs_transaction_handle th;
1185 unsigned long blocks;
1186 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1187 unsigned long safe_mask = 0;
1188 unsigned int commit_max_age = (unsigned int)-1;
1189 struct reiserfs_journal *journal = SB_JOURNAL(s);
1190 char *new_opts = kstrdup(arg, GFP_KERNEL);
1191 int err;
1192 char *qf_names[MAXQUOTAS];
1193 unsigned int qfmt = 0;
1194 #ifdef CONFIG_QUOTA
1195 int i;
1196
1197 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1198 #endif
1199
1200 lock_kernel();
1201 rs = SB_DISK_SUPER_BLOCK(s);
1202
1203 if (!reiserfs_parse_options
1204 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1205 qf_names, &qfmt)) {
1206 #ifdef CONFIG_QUOTA
1207 for (i = 0; i < MAXQUOTAS; i++)
1208 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1209 kfree(qf_names[i]);
1210 #endif
1211 err = -EINVAL;
1212 goto out_err;
1213 }
1214 #ifdef CONFIG_QUOTA
1215 handle_quota_files(s, qf_names, &qfmt);
1216 #endif
1217
1218 handle_attrs(s);
1219
1220 /* Add options that are safe here */
1221 safe_mask |= 1 << REISERFS_SMALLTAIL;
1222 safe_mask |= 1 << REISERFS_LARGETAIL;
1223 safe_mask |= 1 << REISERFS_NO_BORDER;
1224 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1225 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1226 safe_mask |= 1 << REISERFS_TEST4;
1227 safe_mask |= 1 << REISERFS_ATTRS;
1228 safe_mask |= 1 << REISERFS_XATTRS_USER;
1229 safe_mask |= 1 << REISERFS_POSIXACL;
1230 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1231 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1232 safe_mask |= 1 << REISERFS_ERROR_RO;
1233 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1234 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1235 safe_mask |= 1 << REISERFS_QUOTA;
1236
1237 /* Update the bitmask, taking care to keep
1238 * the bits we're not allowed to change here */
1239 REISERFS_SB(s)->s_mount_opt =
1240 (REISERFS_SB(s)->
1241 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1242
1243 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1244 journal->j_max_commit_age = commit_max_age;
1245 journal->j_max_trans_age = commit_max_age;
1246 } else if (commit_max_age == 0) {
1247 /* 0 means restore defaults. */
1248 journal->j_max_commit_age = journal->j_default_max_commit_age;
1249 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1250 }
1251
1252 if (blocks) {
1253 err = reiserfs_resize(s, blocks);
1254 if (err != 0)
1255 goto out_err;
1256 }
1257
1258 if (*mount_flags & MS_RDONLY) {
1259 reiserfs_xattr_init(s, *mount_flags);
1260 /* remount read-only */
1261 if (s->s_flags & MS_RDONLY)
1262 /* it is read-only already */
1263 goto out_ok;
1264 /* try to remount file system with read-only permissions */
1265 if (sb_umount_state(rs) == REISERFS_VALID_FS
1266 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1267 goto out_ok;
1268 }
1269
1270 err = journal_begin(&th, s, 10);
1271 if (err)
1272 goto out_err;
1273
1274 /* Mounting a rw partition read-only. */
1275 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1276 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1277 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1278 } else {
1279 /* remount read-write */
1280 if (!(s->s_flags & MS_RDONLY)) {
1281 reiserfs_xattr_init(s, *mount_flags);
1282 goto out_ok; /* We are read-write already */
1283 }
1284
1285 if (reiserfs_is_journal_aborted(journal)) {
1286 err = journal->j_errno;
1287 goto out_err;
1288 }
1289
1290 handle_data_mode(s, mount_options);
1291 handle_barrier_mode(s, mount_options);
1292 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1293 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1294 err = journal_begin(&th, s, 10);
1295 if (err)
1296 goto out_err;
1297
1298 /* Mount a partition which is read-only, read-write */
1299 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1300 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1301 s->s_flags &= ~MS_RDONLY;
1302 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1303 if (!old_format_only(s))
1304 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1305 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1306 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1307 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1308 }
1309 /* this will force a full flush of all journal lists */
1310 SB_JOURNAL(s)->j_must_wait = 1;
1311 err = journal_end(&th, s, 10);
1312 if (err)
1313 goto out_err;
1314 s->s_dirt = 0;
1315
1316 if (!(*mount_flags & MS_RDONLY)) {
1317 finish_unfinished(s);
1318 reiserfs_xattr_init(s, *mount_flags);
1319 }
1320
1321 out_ok:
1322 replace_mount_options(s, new_opts);
1323 unlock_kernel();
1324 return 0;
1325
1326 out_err:
1327 kfree(new_opts);
1328 unlock_kernel();
1329 return err;
1330 }
1331
1332 static int read_super_block(struct super_block *s, int offset)
1333 {
1334 struct buffer_head *bh;
1335 struct reiserfs_super_block *rs;
1336 int fs_blocksize;
1337
1338 bh = sb_bread(s, offset / s->s_blocksize);
1339 if (!bh) {
1340 reiserfs_warning(s, "sh-2006",
1341 "bread failed (dev %s, block %lu, size %lu)",
1342 reiserfs_bdevname(s), offset / s->s_blocksize,
1343 s->s_blocksize);
1344 return 1;
1345 }
1346
1347 rs = (struct reiserfs_super_block *)bh->b_data;
1348 if (!is_any_reiserfs_magic_string(rs)) {
1349 brelse(bh);
1350 return 1;
1351 }
1352 //
1353 // ok, reiserfs signature (old or new) found in at the given offset
1354 //
1355 fs_blocksize = sb_blocksize(rs);
1356 brelse(bh);
1357 sb_set_blocksize(s, fs_blocksize);
1358
1359 bh = sb_bread(s, offset / s->s_blocksize);
1360 if (!bh) {
1361 reiserfs_warning(s, "sh-2007",
1362 "bread failed (dev %s, block %lu, size %lu)",
1363 reiserfs_bdevname(s), offset / s->s_blocksize,
1364 s->s_blocksize);
1365 return 1;
1366 }
1367
1368 rs = (struct reiserfs_super_block *)bh->b_data;
1369 if (sb_blocksize(rs) != s->s_blocksize) {
1370 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1371 "filesystem on (dev %s, block %Lu, size %lu)",
1372 reiserfs_bdevname(s),
1373 (unsigned long long)bh->b_blocknr,
1374 s->s_blocksize);
1375 brelse(bh);
1376 return 1;
1377 }
1378
1379 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1380 brelse(bh);
1381 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1382 "--rebuild-tree run detected. Please run\n"
1383 "reiserfsck --rebuild-tree and wait for a "
1384 "completion. If that fails\n"
1385 "get newer reiserfsprogs package");
1386 return 1;
1387 }
1388
1389 SB_BUFFER_WITH_SB(s) = bh;
1390 SB_DISK_SUPER_BLOCK(s) = rs;
1391
1392 if (is_reiserfs_jr(rs)) {
1393 /* magic is of non-standard journal filesystem, look at s_version to
1394 find which format is in use */
1395 if (sb_version(rs) == REISERFS_VERSION_2)
1396 reiserfs_info(s, "found reiserfs format \"3.6\""
1397 " with non-standard journal\n");
1398 else if (sb_version(rs) == REISERFS_VERSION_1)
1399 reiserfs_info(s, "found reiserfs format \"3.5\""
1400 " with non-standard journal\n");
1401 else {
1402 reiserfs_warning(s, "sh-2012", "found unknown "
1403 "format \"%u\" of reiserfs with "
1404 "non-standard magic", sb_version(rs));
1405 return 1;
1406 }
1407 } else
1408 /* s_version of standard format may contain incorrect information,
1409 so we just look at the magic string */
1410 reiserfs_info(s,
1411 "found reiserfs format \"%s\" with standard journal\n",
1412 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1413
1414 s->s_op = &reiserfs_sops;
1415 s->s_export_op = &reiserfs_export_ops;
1416 #ifdef CONFIG_QUOTA
1417 s->s_qcop = &reiserfs_qctl_operations;
1418 s->dq_op = &reiserfs_quota_operations;
1419 #endif
1420
1421 /* new format is limited by the 32 bit wide i_blocks field, want to
1422 ** be one full block below that.
1423 */
1424 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1425 return 0;
1426 }
1427
1428 /* after journal replay, reread all bitmap and super blocks */
1429 static int reread_meta_blocks(struct super_block *s)
1430 {
1431 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1432 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1433 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1434 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1435 return 1;
1436 }
1437
1438 return 0;
1439 }
1440
1441 /////////////////////////////////////////////////////
1442 // hash detection stuff
1443
1444 // if root directory is empty - we set default - Yura's - hash and
1445 // warn about it
1446 // FIXME: we look for only one name in a directory. If tea and yura
1447 // bith have the same value - we ask user to send report to the
1448 // mailing list
1449 static __u32 find_hash_out(struct super_block *s)
1450 {
1451 int retval;
1452 struct inode *inode;
1453 struct cpu_key key;
1454 INITIALIZE_PATH(path);
1455 struct reiserfs_dir_entry de;
1456 __u32 hash = DEFAULT_HASH;
1457
1458 inode = s->s_root->d_inode;
1459
1460 do { // Some serious "goto"-hater was there ;)
1461 u32 teahash, r5hash, yurahash;
1462
1463 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1464 retval = search_by_entry_key(s, &key, &path, &de);
1465 if (retval == IO_ERROR) {
1466 pathrelse(&path);
1467 return UNSET_HASH;
1468 }
1469 if (retval == NAME_NOT_FOUND)
1470 de.de_entry_num--;
1471 set_de_name_and_namelen(&de);
1472 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1473 /* allow override in this case */
1474 if (reiserfs_rupasov_hash(s)) {
1475 hash = YURA_HASH;
1476 }
1477 reiserfs_info(s, "FS seems to be empty, autodetect "
1478 "is using the default hash\n");
1479 break;
1480 }
1481 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1482 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1483 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1484 if (((teahash == r5hash)
1485 &&
1486 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1487 == r5hash)) || ((teahash == yurahash)
1488 && (yurahash ==
1489 GET_HASH_VALUE(deh_offset
1490 (&
1491 (de.
1492 de_deh[de.
1493 de_entry_num])))))
1494 || ((r5hash == yurahash)
1495 && (yurahash ==
1496 GET_HASH_VALUE(deh_offset
1497 (&(de.de_deh[de.de_entry_num])))))) {
1498 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1499 "automatically detect hash function. "
1500 "Please mount with -o "
1501 "hash={tea,rupasov,r5}");
1502 hash = UNSET_HASH;
1503 break;
1504 }
1505 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1506 yurahash)
1507 hash = YURA_HASH;
1508 else if (GET_HASH_VALUE
1509 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1510 hash = TEA_HASH;
1511 else if (GET_HASH_VALUE
1512 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1513 hash = R5_HASH;
1514 else {
1515 reiserfs_warning(s, "reiserfs-2506",
1516 "Unrecognised hash function");
1517 hash = UNSET_HASH;
1518 }
1519 } while (0);
1520
1521 pathrelse(&path);
1522 return hash;
1523 }
1524
1525 // finds out which hash names are sorted with
1526 static int what_hash(struct super_block *s)
1527 {
1528 __u32 code;
1529
1530 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1531
1532 /* reiserfs_hash_detect() == true if any of the hash mount options
1533 ** were used. We must check them to make sure the user isn't
1534 ** using a bad hash value
1535 */
1536 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1537 code = find_hash_out(s);
1538
1539 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1540 /* detection has found the hash, and we must check against the
1541 ** mount options
1542 */
1543 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1544 reiserfs_warning(s, "reiserfs-2507",
1545 "Error, %s hash detected, "
1546 "unable to force rupasov hash",
1547 reiserfs_hashname(code));
1548 code = UNSET_HASH;
1549 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1550 reiserfs_warning(s, "reiserfs-2508",
1551 "Error, %s hash detected, "
1552 "unable to force tea hash",
1553 reiserfs_hashname(code));
1554 code = UNSET_HASH;
1555 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1556 reiserfs_warning(s, "reiserfs-2509",
1557 "Error, %s hash detected, "
1558 "unable to force r5 hash",
1559 reiserfs_hashname(code));
1560 code = UNSET_HASH;
1561 }
1562 } else {
1563 /* find_hash_out was not called or could not determine the hash */
1564 if (reiserfs_rupasov_hash(s)) {
1565 code = YURA_HASH;
1566 } else if (reiserfs_tea_hash(s)) {
1567 code = TEA_HASH;
1568 } else if (reiserfs_r5_hash(s)) {
1569 code = R5_HASH;
1570 }
1571 }
1572
1573 /* if we are mounted RW, and we have a new valid hash code, update
1574 ** the super
1575 */
1576 if (code != UNSET_HASH &&
1577 !(s->s_flags & MS_RDONLY) &&
1578 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1579 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1580 }
1581 return code;
1582 }
1583
1584 // return pointer to appropriate function
1585 static hashf_t hash_function(struct super_block *s)
1586 {
1587 switch (what_hash(s)) {
1588 case TEA_HASH:
1589 reiserfs_info(s, "Using tea hash to sort names\n");
1590 return keyed_hash;
1591 case YURA_HASH:
1592 reiserfs_info(s, "Using rupasov hash to sort names\n");
1593 return yura_hash;
1594 case R5_HASH:
1595 reiserfs_info(s, "Using r5 hash to sort names\n");
1596 return r5_hash;
1597 }
1598 return NULL;
1599 }
1600
1601 // this is used to set up correct value for old partitions
1602 static int function2code(hashf_t func)
1603 {
1604 if (func == keyed_hash)
1605 return TEA_HASH;
1606 if (func == yura_hash)
1607 return YURA_HASH;
1608 if (func == r5_hash)
1609 return R5_HASH;
1610
1611 BUG(); // should never happen
1612
1613 return 0;
1614 }
1615
1616 #define SWARN(silent, s, id, ...) \
1617 if (!(silent)) \
1618 reiserfs_warning(s, id, __VA_ARGS__)
1619
1620 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1621 {
1622 struct inode *root_inode;
1623 struct reiserfs_transaction_handle th;
1624 int old_format = 0;
1625 unsigned long blocks;
1626 unsigned int commit_max_age = 0;
1627 int jinit_done = 0;
1628 struct reiserfs_iget_args args;
1629 struct reiserfs_super_block *rs;
1630 char *jdev_name;
1631 struct reiserfs_sb_info *sbi;
1632 int errval = -EINVAL;
1633 char *qf_names[MAXQUOTAS] = {};
1634 unsigned int qfmt = 0;
1635
1636 save_mount_options(s, data);
1637
1638 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1639 if (!sbi) {
1640 errval = -ENOMEM;
1641 goto error;
1642 }
1643 s->s_fs_info = sbi;
1644 /* Set default values for options: non-aggressive tails, RO on errors */
1645 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1646 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1647 /* no preallocation minimum, be smart in
1648 reiserfs_file_write instead */
1649 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1650 /* Preallocate by 16 blocks (17-1) at once */
1651 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1652 /* setup default block allocator options */
1653 reiserfs_init_alloc_options(s);
1654
1655 jdev_name = NULL;
1656 if (reiserfs_parse_options
1657 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1658 &commit_max_age, qf_names, &qfmt) == 0) {
1659 goto error;
1660 }
1661 #ifdef CONFIG_QUOTA
1662 handle_quota_files(s, qf_names, &qfmt);
1663 #endif
1664
1665 if (blocks) {
1666 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1667 goto error;
1668 }
1669
1670 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1671 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1672 old_format = 1;
1673 /* try new format (64-th 1k block), which can contain reiserfs super block */
1674 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1675 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1676 reiserfs_bdevname(s));
1677 goto error;
1678 }
1679
1680 rs = SB_DISK_SUPER_BLOCK(s);
1681 /* Let's do basic sanity check to verify that underlying device is not
1682 smaller than the filesystem. If the check fails then abort and scream,
1683 because bad stuff will happen otherwise. */
1684 if (s->s_bdev && s->s_bdev->bd_inode
1685 && i_size_read(s->s_bdev->bd_inode) <
1686 sb_block_count(rs) * sb_blocksize(rs)) {
1687 SWARN(silent, s, "", "Filesystem cannot be "
1688 "mounted because it is bigger than the device");
1689 SWARN(silent, s, "", "You may need to run fsck "
1690 "or increase size of your LVM partition");
1691 SWARN(silent, s, "", "Or may be you forgot to "
1692 "reboot after fdisk when it told you to");
1693 goto error;
1694 }
1695
1696 sbi->s_mount_state = SB_REISERFS_STATE(s);
1697 sbi->s_mount_state = REISERFS_VALID_FS;
1698
1699 if ((errval = reiserfs_init_bitmap_cache(s))) {
1700 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1701 goto error;
1702 }
1703 errval = -EINVAL;
1704 #ifdef CONFIG_REISERFS_CHECK
1705 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1706 SWARN(silent, s, "", "- it is slow mode for debugging.");
1707 #endif
1708
1709 /* make data=ordered the default */
1710 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1711 !reiserfs_data_writeback(s)) {
1712 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1713 }
1714
1715 if (reiserfs_data_log(s)) {
1716 reiserfs_info(s, "using journaled data mode\n");
1717 } else if (reiserfs_data_ordered(s)) {
1718 reiserfs_info(s, "using ordered data mode\n");
1719 } else {
1720 reiserfs_info(s, "using writeback data mode\n");
1721 }
1722 if (reiserfs_barrier_flush(s)) {
1723 printk("reiserfs: using flush barriers\n");
1724 }
1725 // set_device_ro(s->s_dev, 1) ;
1726 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1727 SWARN(silent, s, "sh-2022",
1728 "unable to initialize journal space");
1729 goto error;
1730 } else {
1731 jinit_done = 1; /* once this is set, journal_release must be called
1732 ** if we error out of the mount
1733 */
1734 }
1735 if (reread_meta_blocks(s)) {
1736 SWARN(silent, s, "jmacd-9",
1737 "unable to reread meta blocks after journal init");
1738 goto error;
1739 }
1740
1741 if (replay_only(s))
1742 goto error;
1743
1744 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1745 SWARN(silent, s, "clm-7000",
1746 "Detected readonly device, marking FS readonly");
1747 s->s_flags |= MS_RDONLY;
1748 }
1749 args.objectid = REISERFS_ROOT_OBJECTID;
1750 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1751 root_inode =
1752 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1753 reiserfs_init_locked_inode, (void *)(&args));
1754 if (!root_inode) {
1755 SWARN(silent, s, "jmacd-10", "get root inode failed");
1756 goto error;
1757 }
1758
1759 if (root_inode->i_state & I_NEW) {
1760 reiserfs_read_locked_inode(root_inode, &args);
1761 unlock_new_inode(root_inode);
1762 }
1763
1764 s->s_root = d_alloc_root(root_inode);
1765 if (!s->s_root) {
1766 iput(root_inode);
1767 goto error;
1768 }
1769 // define and initialize hash function
1770 sbi->s_hash_function = hash_function(s);
1771 if (sbi->s_hash_function == NULL) {
1772 dput(s->s_root);
1773 s->s_root = NULL;
1774 goto error;
1775 }
1776
1777 if (is_reiserfs_3_5(rs)
1778 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1779 set_bit(REISERFS_3_5, &(sbi->s_properties));
1780 else if (old_format)
1781 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1782 else
1783 set_bit(REISERFS_3_6, &(sbi->s_properties));
1784
1785 if (!(s->s_flags & MS_RDONLY)) {
1786
1787 errval = journal_begin(&th, s, 1);
1788 if (errval) {
1789 dput(s->s_root);
1790 s->s_root = NULL;
1791 goto error;
1792 }
1793 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1794
1795 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1796 set_sb_fs_state(rs, 0);
1797
1798 /* Clear out s_bmap_nr if it would wrap. We can handle this
1799 * case, but older revisions can't. This will cause the
1800 * file system to fail mount on those older implementations,
1801 * avoiding corruption. -jeffm */
1802 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1803 sb_bmap_nr(rs) != 0) {
1804 reiserfs_warning(s, "super-2030", "This file system "
1805 "claims to use %u bitmap blocks in "
1806 "its super block, but requires %u. "
1807 "Clearing to zero.", sb_bmap_nr(rs),
1808 reiserfs_bmap_count(s));
1809
1810 set_sb_bmap_nr(rs, 0);
1811 }
1812
1813 if (old_format_only(s)) {
1814 /* filesystem of format 3.5 either with standard or non-standard
1815 journal */
1816 if (convert_reiserfs(s)) {
1817 /* and -o conv is given */
1818 if (!silent)
1819 reiserfs_info(s,
1820 "converting 3.5 filesystem to the 3.6 format");
1821
1822 if (is_reiserfs_3_5(rs))
1823 /* put magic string of 3.6 format. 2.2 will not be able to
1824 mount this filesystem anymore */
1825 memcpy(rs->s_v1.s_magic,
1826 reiserfs_3_6_magic_string,
1827 sizeof
1828 (reiserfs_3_6_magic_string));
1829
1830 set_sb_version(rs, REISERFS_VERSION_2);
1831 reiserfs_convert_objectid_map_v1(s);
1832 set_bit(REISERFS_3_6, &(sbi->s_properties));
1833 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1834 } else if (!silent) {
1835 reiserfs_info(s, "using 3.5.x disk format\n");
1836 }
1837 } else
1838 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1839
1840
1841 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1842 errval = journal_end(&th, s, 1);
1843 if (errval) {
1844 dput(s->s_root);
1845 s->s_root = NULL;
1846 goto error;
1847 }
1848
1849 if ((errval = reiserfs_lookup_privroot(s)) ||
1850 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1851 dput(s->s_root);
1852 s->s_root = NULL;
1853 goto error;
1854 }
1855
1856 /* look for files which were to be removed in previous session */
1857 finish_unfinished(s);
1858 } else {
1859 if (old_format_only(s) && !silent) {
1860 reiserfs_info(s, "using 3.5.x disk format\n");
1861 }
1862
1863 if ((errval = reiserfs_lookup_privroot(s)) ||
1864 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1865 dput(s->s_root);
1866 s->s_root = NULL;
1867 goto error;
1868 }
1869 }
1870 // mark hash in super block: it could be unset. overwrite should be ok
1871 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1872
1873 handle_attrs(s);
1874
1875 reiserfs_proc_info_init(s);
1876
1877 init_waitqueue_head(&(sbi->s_wait));
1878 spin_lock_init(&sbi->bitmap_lock);
1879
1880 return (0);
1881
1882 error:
1883 if (jinit_done) { /* kill the commit thread, free journal ram */
1884 journal_release_error(NULL, s);
1885 }
1886
1887 reiserfs_free_bitmap_cache(s);
1888 if (SB_BUFFER_WITH_SB(s))
1889 brelse(SB_BUFFER_WITH_SB(s));
1890 #ifdef CONFIG_QUOTA
1891 {
1892 int j;
1893 for (j = 0; j < MAXQUOTAS; j++)
1894 kfree(qf_names[j]);
1895 }
1896 #endif
1897 kfree(sbi);
1898
1899 s->s_fs_info = NULL;
1900 return errval;
1901 }
1902
1903 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1904 {
1905 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1906
1907 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1908 buf->f_bfree = sb_free_blocks(rs);
1909 buf->f_bavail = buf->f_bfree;
1910 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1911 buf->f_bsize = dentry->d_sb->s_blocksize;
1912 /* changed to accommodate gcc folks. */
1913 buf->f_type = REISERFS_SUPER_MAGIC;
1914 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1915 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1916 sizeof(rs->s_uuid)/2);
1917
1918 return 0;
1919 }
1920
1921 #ifdef CONFIG_QUOTA
1922 static int reiserfs_write_dquot(struct dquot *dquot)
1923 {
1924 struct reiserfs_transaction_handle th;
1925 int ret, err;
1926
1927 reiserfs_write_lock(dquot->dq_sb);
1928 ret =
1929 journal_begin(&th, dquot->dq_sb,
1930 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1931 if (ret)
1932 goto out;
1933 ret = dquot_commit(dquot);
1934 err =
1935 journal_end(&th, dquot->dq_sb,
1936 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1937 if (!ret && err)
1938 ret = err;
1939 out:
1940 reiserfs_write_unlock(dquot->dq_sb);
1941 return ret;
1942 }
1943
1944 static int reiserfs_acquire_dquot(struct dquot *dquot)
1945 {
1946 struct reiserfs_transaction_handle th;
1947 int ret, err;
1948
1949 reiserfs_write_lock(dquot->dq_sb);
1950 ret =
1951 journal_begin(&th, dquot->dq_sb,
1952 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1953 if (ret)
1954 goto out;
1955 ret = dquot_acquire(dquot);
1956 err =
1957 journal_end(&th, dquot->dq_sb,
1958 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1959 if (!ret && err)
1960 ret = err;
1961 out:
1962 reiserfs_write_unlock(dquot->dq_sb);
1963 return ret;
1964 }
1965
1966 static int reiserfs_release_dquot(struct dquot *dquot)
1967 {
1968 struct reiserfs_transaction_handle th;
1969 int ret, err;
1970
1971 reiserfs_write_lock(dquot->dq_sb);
1972 ret =
1973 journal_begin(&th, dquot->dq_sb,
1974 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1975 if (ret) {
1976 /* Release dquot anyway to avoid endless cycle in dqput() */
1977 dquot_release(dquot);
1978 goto out;
1979 }
1980 ret = dquot_release(dquot);
1981 err =
1982 journal_end(&th, dquot->dq_sb,
1983 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1984 if (!ret && err)
1985 ret = err;
1986 out:
1987 reiserfs_write_unlock(dquot->dq_sb);
1988 return ret;
1989 }
1990
1991 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1992 {
1993 /* Are we journaling quotas? */
1994 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1995 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1996 dquot_mark_dquot_dirty(dquot);
1997 return reiserfs_write_dquot(dquot);
1998 } else
1999 return dquot_mark_dquot_dirty(dquot);
2000 }
2001
2002 static int reiserfs_write_info(struct super_block *sb, int type)
2003 {
2004 struct reiserfs_transaction_handle th;
2005 int ret, err;
2006
2007 /* Data block + inode block */
2008 reiserfs_write_lock(sb);
2009 ret = journal_begin(&th, sb, 2);
2010 if (ret)
2011 goto out;
2012 ret = dquot_commit_info(sb, type);
2013 err = journal_end(&th, sb, 2);
2014 if (!ret && err)
2015 ret = err;
2016 out:
2017 reiserfs_write_unlock(sb);
2018 return ret;
2019 }
2020
2021 /*
2022 * Turn on quotas during mount time - we need to find the quota file and such...
2023 */
2024 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2025 {
2026 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2027 REISERFS_SB(sb)->s_jquota_fmt, type);
2028 }
2029
2030 /*
2031 * Standard function to be called on quota_on
2032 */
2033 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2034 char *name, int remount)
2035 {
2036 int err;
2037 struct path path;
2038 struct inode *inode;
2039 struct reiserfs_transaction_handle th;
2040
2041 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2042 return -EINVAL;
2043 /* No more checks needed? Path and format_id are bogus anyway... */
2044 if (remount)
2045 return vfs_quota_on(sb, type, format_id, name, 1);
2046 err = kern_path(name, LOOKUP_FOLLOW, &path);
2047 if (err)
2048 return err;
2049 /* Quotafile not on the same filesystem? */
2050 if (path.mnt->mnt_sb != sb) {
2051 err = -EXDEV;
2052 goto out;
2053 }
2054 inode = path.dentry->d_inode;
2055 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2056 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2057 err = reiserfs_unpack(inode, NULL);
2058 if (err) {
2059 reiserfs_warning(sb, "super-6520",
2060 "Unpacking tail of quota file failed"
2061 " (%d). Cannot turn on quotas.", err);
2062 err = -EINVAL;
2063 goto out;
2064 }
2065 mark_inode_dirty(inode);
2066 }
2067 /* Journaling quota? */
2068 if (REISERFS_SB(sb)->s_qf_names[type]) {
2069 /* Quotafile not of fs root? */
2070 if (path.dentry->d_parent != sb->s_root)
2071 reiserfs_warning(sb, "super-6521",
2072 "Quota file not on filesystem root. "
2073 "Journalled quota will not work.");
2074 }
2075
2076 /*
2077 * When we journal data on quota file, we have to flush journal to see
2078 * all updates to the file when we bypass pagecache...
2079 */
2080 if (reiserfs_file_data_log(inode)) {
2081 /* Just start temporary transaction and finish it */
2082 err = journal_begin(&th, sb, 1);
2083 if (err)
2084 goto out;
2085 err = journal_end_sync(&th, sb, 1);
2086 if (err)
2087 goto out;
2088 }
2089 err = vfs_quota_on_path(sb, type, format_id, &path);
2090 out:
2091 path_put(&path);
2092 return err;
2093 }
2094
2095 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2096 * acquiring the locks... As quota files are never truncated and quota code
2097 * itself serializes the operations (and noone else should touch the files)
2098 * we don't have to be afraid of races */
2099 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2100 size_t len, loff_t off)
2101 {
2102 struct inode *inode = sb_dqopt(sb)->files[type];
2103 unsigned long blk = off >> sb->s_blocksize_bits;
2104 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2105 size_t toread;
2106 struct buffer_head tmp_bh, *bh;
2107 loff_t i_size = i_size_read(inode);
2108
2109 if (off > i_size)
2110 return 0;
2111 if (off + len > i_size)
2112 len = i_size - off;
2113 toread = len;
2114 while (toread > 0) {
2115 tocopy =
2116 sb->s_blocksize - offset <
2117 toread ? sb->s_blocksize - offset : toread;
2118 tmp_bh.b_state = 0;
2119 /* Quota files are without tails so we can safely use this function */
2120 reiserfs_write_lock(sb);
2121 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2122 reiserfs_write_unlock(sb);
2123 if (err)
2124 return err;
2125 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2126 memset(data, 0, tocopy);
2127 else {
2128 bh = sb_bread(sb, tmp_bh.b_blocknr);
2129 if (!bh)
2130 return -EIO;
2131 memcpy(data, bh->b_data + offset, tocopy);
2132 brelse(bh);
2133 }
2134 offset = 0;
2135 toread -= tocopy;
2136 data += tocopy;
2137 blk++;
2138 }
2139 return len;
2140 }
2141
2142 /* Write to quotafile (we know the transaction is already started and has
2143 * enough credits) */
2144 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2145 const char *data, size_t len, loff_t off)
2146 {
2147 struct inode *inode = sb_dqopt(sb)->files[type];
2148 unsigned long blk = off >> sb->s_blocksize_bits;
2149 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2150 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2151 size_t towrite = len;
2152 struct buffer_head tmp_bh, *bh;
2153
2154 if (!current->journal_info) {
2155 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2156 " cancelled because transaction is not started.\n",
2157 (unsigned long long)off, (unsigned long long)len);
2158 return -EIO;
2159 }
2160 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2161 while (towrite > 0) {
2162 tocopy = sb->s_blocksize - offset < towrite ?
2163 sb->s_blocksize - offset : towrite;
2164 tmp_bh.b_state = 0;
2165 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2166 if (err)
2167 goto out;
2168 if (offset || tocopy != sb->s_blocksize)
2169 bh = sb_bread(sb, tmp_bh.b_blocknr);
2170 else
2171 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2172 if (!bh) {
2173 err = -EIO;
2174 goto out;
2175 }
2176 lock_buffer(bh);
2177 memcpy(bh->b_data + offset, data, tocopy);
2178 flush_dcache_page(bh->b_page);
2179 set_buffer_uptodate(bh);
2180 unlock_buffer(bh);
2181 reiserfs_prepare_for_journal(sb, bh, 1);
2182 journal_mark_dirty(current->journal_info, sb, bh);
2183 if (!journal_quota)
2184 reiserfs_add_ordered_list(inode, bh);
2185 brelse(bh);
2186 offset = 0;
2187 towrite -= tocopy;
2188 data += tocopy;
2189 blk++;
2190 }
2191 out:
2192 if (len == towrite) {
2193 mutex_unlock(&inode->i_mutex);
2194 return err;
2195 }
2196 if (inode->i_size < off + len - towrite)
2197 i_size_write(inode, off + len - towrite);
2198 inode->i_version++;
2199 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2200 mark_inode_dirty(inode);
2201 mutex_unlock(&inode->i_mutex);
2202 return len - towrite;
2203 }
2204
2205 #endif
2206
2207 static int get_super_block(struct file_system_type *fs_type,
2208 int flags, const char *dev_name,
2209 void *data, struct vfsmount *mnt)
2210 {
2211 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2212 mnt);
2213 }
2214
2215 static int __init init_reiserfs_fs(void)
2216 {
2217 int ret;
2218
2219 if ((ret = init_inodecache())) {
2220 return ret;
2221 }
2222
2223 reiserfs_proc_info_global_init();
2224 reiserfs_proc_register_global("version",
2225 reiserfs_global_version_in_proc);
2226
2227 ret = register_filesystem(&reiserfs_fs_type);
2228
2229 if (ret == 0) {
2230 return 0;
2231 }
2232
2233 reiserfs_proc_unregister_global("version");
2234 reiserfs_proc_info_global_done();
2235 destroy_inodecache();
2236
2237 return ret;
2238 }
2239
2240 static void __exit exit_reiserfs_fs(void)
2241 {
2242 reiserfs_proc_unregister_global("version");
2243 reiserfs_proc_info_global_done();
2244 unregister_filesystem(&reiserfs_fs_type);
2245 destroy_inodecache();
2246 }
2247
2248 struct file_system_type reiserfs_fs_type = {
2249 .owner = THIS_MODULE,
2250 .name = "reiserfs",
2251 .get_sb = get_super_block,
2252 .kill_sb = reiserfs_kill_sb,
2253 .fs_flags = FS_REQUIRES_DEV,
2254 };
2255
2256 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2257 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2258 MODULE_LICENSE("GPL");
2259
2260 module_init(init_reiserfs_fs);
2261 module_exit(exit_reiserfs_fs);
CJK support for tty framebuffer vt