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remove ->write_super call in generic_shutdown_super
[deliverable/linux.git] / fs / reiserfs / super.c
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/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 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 return;
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 rs = SB_DISK_SUPER_BLOCK(s);
1201
1202 if (!reiserfs_parse_options
1203 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1204 qf_names, &qfmt)) {
1205 #ifdef CONFIG_QUOTA
1206 for (i = 0; i < MAXQUOTAS; i++)
1207 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1208 kfree(qf_names[i]);
1209 #endif
1210 err = -EINVAL;
1211 goto out_err;
1212 }
1213 #ifdef CONFIG_QUOTA
1214 handle_quota_files(s, qf_names, &qfmt);
1215 #endif
1216
1217 handle_attrs(s);
1218
1219 /* Add options that are safe here */
1220 safe_mask |= 1 << REISERFS_SMALLTAIL;
1221 safe_mask |= 1 << REISERFS_LARGETAIL;
1222 safe_mask |= 1 << REISERFS_NO_BORDER;
1223 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1224 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1225 safe_mask |= 1 << REISERFS_TEST4;
1226 safe_mask |= 1 << REISERFS_ATTRS;
1227 safe_mask |= 1 << REISERFS_XATTRS_USER;
1228 safe_mask |= 1 << REISERFS_POSIXACL;
1229 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1230 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1231 safe_mask |= 1 << REISERFS_ERROR_RO;
1232 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1233 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1234 safe_mask |= 1 << REISERFS_QUOTA;
1235
1236 /* Update the bitmask, taking care to keep
1237 * the bits we're not allowed to change here */
1238 REISERFS_SB(s)->s_mount_opt =
1239 (REISERFS_SB(s)->
1240 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1241
1242 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1243 journal->j_max_commit_age = commit_max_age;
1244 journal->j_max_trans_age = commit_max_age;
1245 } else if (commit_max_age == 0) {
1246 /* 0 means restore defaults. */
1247 journal->j_max_commit_age = journal->j_default_max_commit_age;
1248 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1249 }
1250
1251 if (blocks) {
1252 err = reiserfs_resize(s, blocks);
1253 if (err != 0)
1254 goto out_err;
1255 }
1256
1257 if (*mount_flags & MS_RDONLY) {
1258 reiserfs_xattr_init(s, *mount_flags);
1259 /* remount read-only */
1260 if (s->s_flags & MS_RDONLY)
1261 /* it is read-only already */
1262 goto out_ok;
1263 /* try to remount file system with read-only permissions */
1264 if (sb_umount_state(rs) == REISERFS_VALID_FS
1265 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1266 goto out_ok;
1267 }
1268
1269 err = journal_begin(&th, s, 10);
1270 if (err)
1271 goto out_err;
1272
1273 /* Mounting a rw partition read-only. */
1274 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1275 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1276 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1277 } else {
1278 /* remount read-write */
1279 if (!(s->s_flags & MS_RDONLY)) {
1280 reiserfs_xattr_init(s, *mount_flags);
1281 goto out_ok; /* We are read-write already */
1282 }
1283
1284 if (reiserfs_is_journal_aborted(journal)) {
1285 err = journal->j_errno;
1286 goto out_err;
1287 }
1288
1289 handle_data_mode(s, mount_options);
1290 handle_barrier_mode(s, mount_options);
1291 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1292 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1293 err = journal_begin(&th, s, 10);
1294 if (err)
1295 goto out_err;
1296
1297 /* Mount a partition which is read-only, read-write */
1298 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1299 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1300 s->s_flags &= ~MS_RDONLY;
1301 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1302 if (!old_format_only(s))
1303 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1304 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1305 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1306 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1307 }
1308 /* this will force a full flush of all journal lists */
1309 SB_JOURNAL(s)->j_must_wait = 1;
1310 err = journal_end(&th, s, 10);
1311 if (err)
1312 goto out_err;
1313 s->s_dirt = 0;
1314
1315 if (!(*mount_flags & MS_RDONLY)) {
1316 finish_unfinished(s);
1317 reiserfs_xattr_init(s, *mount_flags);
1318 }
1319
1320 out_ok:
1321 replace_mount_options(s, new_opts);
1322 return 0;
1323
1324 out_err:
1325 kfree(new_opts);
1326 return err;
1327 }
1328
1329 static int read_super_block(struct super_block *s, int offset)
1330 {
1331 struct buffer_head *bh;
1332 struct reiserfs_super_block *rs;
1333 int fs_blocksize;
1334
1335 bh = sb_bread(s, offset / s->s_blocksize);
1336 if (!bh) {
1337 reiserfs_warning(s, "sh-2006",
1338 "bread failed (dev %s, block %lu, size %lu)",
1339 reiserfs_bdevname(s), offset / s->s_blocksize,
1340 s->s_blocksize);
1341 return 1;
1342 }
1343
1344 rs = (struct reiserfs_super_block *)bh->b_data;
1345 if (!is_any_reiserfs_magic_string(rs)) {
1346 brelse(bh);
1347 return 1;
1348 }
1349 //
1350 // ok, reiserfs signature (old or new) found in at the given offset
1351 //
1352 fs_blocksize = sb_blocksize(rs);
1353 brelse(bh);
1354 sb_set_blocksize(s, fs_blocksize);
1355
1356 bh = sb_bread(s, offset / s->s_blocksize);
1357 if (!bh) {
1358 reiserfs_warning(s, "sh-2007",
1359 "bread failed (dev %s, block %lu, size %lu)",
1360 reiserfs_bdevname(s), offset / s->s_blocksize,
1361 s->s_blocksize);
1362 return 1;
1363 }
1364
1365 rs = (struct reiserfs_super_block *)bh->b_data;
1366 if (sb_blocksize(rs) != s->s_blocksize) {
1367 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1368 "filesystem on (dev %s, block %Lu, size %lu)",
1369 reiserfs_bdevname(s),
1370 (unsigned long long)bh->b_blocknr,
1371 s->s_blocksize);
1372 brelse(bh);
1373 return 1;
1374 }
1375
1376 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1377 brelse(bh);
1378 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1379 "--rebuild-tree run detected. Please run\n"
1380 "reiserfsck --rebuild-tree and wait for a "
1381 "completion. If that fails\n"
1382 "get newer reiserfsprogs package");
1383 return 1;
1384 }
1385
1386 SB_BUFFER_WITH_SB(s) = bh;
1387 SB_DISK_SUPER_BLOCK(s) = rs;
1388
1389 if (is_reiserfs_jr(rs)) {
1390 /* magic is of non-standard journal filesystem, look at s_version to
1391 find which format is in use */
1392 if (sb_version(rs) == REISERFS_VERSION_2)
1393 reiserfs_info(s, "found reiserfs format \"3.6\""
1394 " with non-standard journal\n");
1395 else if (sb_version(rs) == REISERFS_VERSION_1)
1396 reiserfs_info(s, "found reiserfs format \"3.5\""
1397 " with non-standard journal\n");
1398 else {
1399 reiserfs_warning(s, "sh-2012", "found unknown "
1400 "format \"%u\" of reiserfs with "
1401 "non-standard magic", sb_version(rs));
1402 return 1;
1403 }
1404 } else
1405 /* s_version of standard format may contain incorrect information,
1406 so we just look at the magic string */
1407 reiserfs_info(s,
1408 "found reiserfs format \"%s\" with standard journal\n",
1409 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1410
1411 s->s_op = &reiserfs_sops;
1412 s->s_export_op = &reiserfs_export_ops;
1413 #ifdef CONFIG_QUOTA
1414 s->s_qcop = &reiserfs_qctl_operations;
1415 s->dq_op = &reiserfs_quota_operations;
1416 #endif
1417
1418 /* new format is limited by the 32 bit wide i_blocks field, want to
1419 ** be one full block below that.
1420 */
1421 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1422 return 0;
1423 }
1424
1425 /* after journal replay, reread all bitmap and super blocks */
1426 static int reread_meta_blocks(struct super_block *s)
1427 {
1428 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1429 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1430 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1431 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1432 return 1;
1433 }
1434
1435 return 0;
1436 }
1437
1438 /////////////////////////////////////////////////////
1439 // hash detection stuff
1440
1441 // if root directory is empty - we set default - Yura's - hash and
1442 // warn about it
1443 // FIXME: we look for only one name in a directory. If tea and yura
1444 // bith have the same value - we ask user to send report to the
1445 // mailing list
1446 static __u32 find_hash_out(struct super_block *s)
1447 {
1448 int retval;
1449 struct inode *inode;
1450 struct cpu_key key;
1451 INITIALIZE_PATH(path);
1452 struct reiserfs_dir_entry de;
1453 __u32 hash = DEFAULT_HASH;
1454
1455 inode = s->s_root->d_inode;
1456
1457 do { // Some serious "goto"-hater was there ;)
1458 u32 teahash, r5hash, yurahash;
1459
1460 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1461 retval = search_by_entry_key(s, &key, &path, &de);
1462 if (retval == IO_ERROR) {
1463 pathrelse(&path);
1464 return UNSET_HASH;
1465 }
1466 if (retval == NAME_NOT_FOUND)
1467 de.de_entry_num--;
1468 set_de_name_and_namelen(&de);
1469 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1470 /* allow override in this case */
1471 if (reiserfs_rupasov_hash(s)) {
1472 hash = YURA_HASH;
1473 }
1474 reiserfs_info(s, "FS seems to be empty, autodetect "
1475 "is using the default hash\n");
1476 break;
1477 }
1478 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1479 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1480 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1481 if (((teahash == r5hash)
1482 &&
1483 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1484 == r5hash)) || ((teahash == yurahash)
1485 && (yurahash ==
1486 GET_HASH_VALUE(deh_offset
1487 (&
1488 (de.
1489 de_deh[de.
1490 de_entry_num])))))
1491 || ((r5hash == yurahash)
1492 && (yurahash ==
1493 GET_HASH_VALUE(deh_offset
1494 (&(de.de_deh[de.de_entry_num])))))) {
1495 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1496 "automatically detect hash function. "
1497 "Please mount with -o "
1498 "hash={tea,rupasov,r5}");
1499 hash = UNSET_HASH;
1500 break;
1501 }
1502 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1503 yurahash)
1504 hash = YURA_HASH;
1505 else if (GET_HASH_VALUE
1506 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1507 hash = TEA_HASH;
1508 else if (GET_HASH_VALUE
1509 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1510 hash = R5_HASH;
1511 else {
1512 reiserfs_warning(s, "reiserfs-2506",
1513 "Unrecognised hash function");
1514 hash = UNSET_HASH;
1515 }
1516 } while (0);
1517
1518 pathrelse(&path);
1519 return hash;
1520 }
1521
1522 // finds out which hash names are sorted with
1523 static int what_hash(struct super_block *s)
1524 {
1525 __u32 code;
1526
1527 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1528
1529 /* reiserfs_hash_detect() == true if any of the hash mount options
1530 ** were used. We must check them to make sure the user isn't
1531 ** using a bad hash value
1532 */
1533 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1534 code = find_hash_out(s);
1535
1536 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1537 /* detection has found the hash, and we must check against the
1538 ** mount options
1539 */
1540 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1541 reiserfs_warning(s, "reiserfs-2507",
1542 "Error, %s hash detected, "
1543 "unable to force rupasov hash",
1544 reiserfs_hashname(code));
1545 code = UNSET_HASH;
1546 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1547 reiserfs_warning(s, "reiserfs-2508",
1548 "Error, %s hash detected, "
1549 "unable to force tea hash",
1550 reiserfs_hashname(code));
1551 code = UNSET_HASH;
1552 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1553 reiserfs_warning(s, "reiserfs-2509",
1554 "Error, %s hash detected, "
1555 "unable to force r5 hash",
1556 reiserfs_hashname(code));
1557 code = UNSET_HASH;
1558 }
1559 } else {
1560 /* find_hash_out was not called or could not determine the hash */
1561 if (reiserfs_rupasov_hash(s)) {
1562 code = YURA_HASH;
1563 } else if (reiserfs_tea_hash(s)) {
1564 code = TEA_HASH;
1565 } else if (reiserfs_r5_hash(s)) {
1566 code = R5_HASH;
1567 }
1568 }
1569
1570 /* if we are mounted RW, and we have a new valid hash code, update
1571 ** the super
1572 */
1573 if (code != UNSET_HASH &&
1574 !(s->s_flags & MS_RDONLY) &&
1575 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1576 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1577 }
1578 return code;
1579 }
1580
1581 // return pointer to appropriate function
1582 static hashf_t hash_function(struct super_block *s)
1583 {
1584 switch (what_hash(s)) {
1585 case TEA_HASH:
1586 reiserfs_info(s, "Using tea hash to sort names\n");
1587 return keyed_hash;
1588 case YURA_HASH:
1589 reiserfs_info(s, "Using rupasov hash to sort names\n");
1590 return yura_hash;
1591 case R5_HASH:
1592 reiserfs_info(s, "Using r5 hash to sort names\n");
1593 return r5_hash;
1594 }
1595 return NULL;
1596 }
1597
1598 // this is used to set up correct value for old partitions
1599 static int function2code(hashf_t func)
1600 {
1601 if (func == keyed_hash)
1602 return TEA_HASH;
1603 if (func == yura_hash)
1604 return YURA_HASH;
1605 if (func == r5_hash)
1606 return R5_HASH;
1607
1608 BUG(); // should never happen
1609
1610 return 0;
1611 }
1612
1613 #define SWARN(silent, s, id, ...) \
1614 if (!(silent)) \
1615 reiserfs_warning(s, id, __VA_ARGS__)
1616
1617 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1618 {
1619 struct inode *root_inode;
1620 struct reiserfs_transaction_handle th;
1621 int old_format = 0;
1622 unsigned long blocks;
1623 unsigned int commit_max_age = 0;
1624 int jinit_done = 0;
1625 struct reiserfs_iget_args args;
1626 struct reiserfs_super_block *rs;
1627 char *jdev_name;
1628 struct reiserfs_sb_info *sbi;
1629 int errval = -EINVAL;
1630 char *qf_names[MAXQUOTAS] = {};
1631 unsigned int qfmt = 0;
1632
1633 save_mount_options(s, data);
1634
1635 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1636 if (!sbi) {
1637 errval = -ENOMEM;
1638 goto error;
1639 }
1640 s->s_fs_info = sbi;
1641 /* Set default values for options: non-aggressive tails, RO on errors */
1642 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1643 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1644 /* no preallocation minimum, be smart in
1645 reiserfs_file_write instead */
1646 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1647 /* Preallocate by 16 blocks (17-1) at once */
1648 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1649 /* setup default block allocator options */
1650 reiserfs_init_alloc_options(s);
1651
1652 jdev_name = NULL;
1653 if (reiserfs_parse_options
1654 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1655 &commit_max_age, qf_names, &qfmt) == 0) {
1656 goto error;
1657 }
1658 #ifdef CONFIG_QUOTA
1659 handle_quota_files(s, qf_names, &qfmt);
1660 #endif
1661
1662 if (blocks) {
1663 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1664 goto error;
1665 }
1666
1667 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1668 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1669 old_format = 1;
1670 /* try new format (64-th 1k block), which can contain reiserfs super block */
1671 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1672 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1673 reiserfs_bdevname(s));
1674 goto error;
1675 }
1676
1677 rs = SB_DISK_SUPER_BLOCK(s);
1678 /* Let's do basic sanity check to verify that underlying device is not
1679 smaller than the filesystem. If the check fails then abort and scream,
1680 because bad stuff will happen otherwise. */
1681 if (s->s_bdev && s->s_bdev->bd_inode
1682 && i_size_read(s->s_bdev->bd_inode) <
1683 sb_block_count(rs) * sb_blocksize(rs)) {
1684 SWARN(silent, s, "", "Filesystem cannot be "
1685 "mounted because it is bigger than the device");
1686 SWARN(silent, s, "", "You may need to run fsck "
1687 "or increase size of your LVM partition");
1688 SWARN(silent, s, "", "Or may be you forgot to "
1689 "reboot after fdisk when it told you to");
1690 goto error;
1691 }
1692
1693 sbi->s_mount_state = SB_REISERFS_STATE(s);
1694 sbi->s_mount_state = REISERFS_VALID_FS;
1695
1696 if ((errval = reiserfs_init_bitmap_cache(s))) {
1697 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1698 goto error;
1699 }
1700 errval = -EINVAL;
1701 #ifdef CONFIG_REISERFS_CHECK
1702 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1703 SWARN(silent, s, "", "- it is slow mode for debugging.");
1704 #endif
1705
1706 /* make data=ordered the default */
1707 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1708 !reiserfs_data_writeback(s)) {
1709 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1710 }
1711
1712 if (reiserfs_data_log(s)) {
1713 reiserfs_info(s, "using journaled data mode\n");
1714 } else if (reiserfs_data_ordered(s)) {
1715 reiserfs_info(s, "using ordered data mode\n");
1716 } else {
1717 reiserfs_info(s, "using writeback data mode\n");
1718 }
1719 if (reiserfs_barrier_flush(s)) {
1720 printk("reiserfs: using flush barriers\n");
1721 }
1722 // set_device_ro(s->s_dev, 1) ;
1723 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1724 SWARN(silent, s, "sh-2022",
1725 "unable to initialize journal space");
1726 goto error;
1727 } else {
1728 jinit_done = 1; /* once this is set, journal_release must be called
1729 ** if we error out of the mount
1730 */
1731 }
1732 if (reread_meta_blocks(s)) {
1733 SWARN(silent, s, "jmacd-9",
1734 "unable to reread meta blocks after journal init");
1735 goto error;
1736 }
1737
1738 if (replay_only(s))
1739 goto error;
1740
1741 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1742 SWARN(silent, s, "clm-7000",
1743 "Detected readonly device, marking FS readonly");
1744 s->s_flags |= MS_RDONLY;
1745 }
1746 args.objectid = REISERFS_ROOT_OBJECTID;
1747 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1748 root_inode =
1749 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1750 reiserfs_init_locked_inode, (void *)(&args));
1751 if (!root_inode) {
1752 SWARN(silent, s, "jmacd-10", "get root inode failed");
1753 goto error;
1754 }
1755
1756 if (root_inode->i_state & I_NEW) {
1757 reiserfs_read_locked_inode(root_inode, &args);
1758 unlock_new_inode(root_inode);
1759 }
1760
1761 s->s_root = d_alloc_root(root_inode);
1762 if (!s->s_root) {
1763 iput(root_inode);
1764 goto error;
1765 }
1766 // define and initialize hash function
1767 sbi->s_hash_function = hash_function(s);
1768 if (sbi->s_hash_function == NULL) {
1769 dput(s->s_root);
1770 s->s_root = NULL;
1771 goto error;
1772 }
1773
1774 if (is_reiserfs_3_5(rs)
1775 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1776 set_bit(REISERFS_3_5, &(sbi->s_properties));
1777 else if (old_format)
1778 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1779 else
1780 set_bit(REISERFS_3_6, &(sbi->s_properties));
1781
1782 if (!(s->s_flags & MS_RDONLY)) {
1783
1784 errval = journal_begin(&th, s, 1);
1785 if (errval) {
1786 dput(s->s_root);
1787 s->s_root = NULL;
1788 goto error;
1789 }
1790 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1791
1792 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1793 set_sb_fs_state(rs, 0);
1794
1795 /* Clear out s_bmap_nr if it would wrap. We can handle this
1796 * case, but older revisions can't. This will cause the
1797 * file system to fail mount on those older implementations,
1798 * avoiding corruption. -jeffm */
1799 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1800 sb_bmap_nr(rs) != 0) {
1801 reiserfs_warning(s, "super-2030", "This file system "
1802 "claims to use %u bitmap blocks in "
1803 "its super block, but requires %u. "
1804 "Clearing to zero.", sb_bmap_nr(rs),
1805 reiserfs_bmap_count(s));
1806
1807 set_sb_bmap_nr(rs, 0);
1808 }
1809
1810 if (old_format_only(s)) {
1811 /* filesystem of format 3.5 either with standard or non-standard
1812 journal */
1813 if (convert_reiserfs(s)) {
1814 /* and -o conv is given */
1815 if (!silent)
1816 reiserfs_info(s,
1817 "converting 3.5 filesystem to the 3.6 format");
1818
1819 if (is_reiserfs_3_5(rs))
1820 /* put magic string of 3.6 format. 2.2 will not be able to
1821 mount this filesystem anymore */
1822 memcpy(rs->s_v1.s_magic,
1823 reiserfs_3_6_magic_string,
1824 sizeof
1825 (reiserfs_3_6_magic_string));
1826
1827 set_sb_version(rs, REISERFS_VERSION_2);
1828 reiserfs_convert_objectid_map_v1(s);
1829 set_bit(REISERFS_3_6, &(sbi->s_properties));
1830 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1831 } else if (!silent) {
1832 reiserfs_info(s, "using 3.5.x disk format\n");
1833 }
1834 } else
1835 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1836
1837
1838 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1839 errval = journal_end(&th, s, 1);
1840 if (errval) {
1841 dput(s->s_root);
1842 s->s_root = NULL;
1843 goto error;
1844 }
1845
1846 if ((errval = reiserfs_lookup_privroot(s)) ||
1847 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1848 dput(s->s_root);
1849 s->s_root = NULL;
1850 goto error;
1851 }
1852
1853 /* look for files which were to be removed in previous session */
1854 finish_unfinished(s);
1855 } else {
1856 if (old_format_only(s) && !silent) {
1857 reiserfs_info(s, "using 3.5.x disk format\n");
1858 }
1859
1860 if ((errval = reiserfs_lookup_privroot(s)) ||
1861 (errval = reiserfs_xattr_init(s, s->s_flags))) {
1862 dput(s->s_root);
1863 s->s_root = NULL;
1864 goto error;
1865 }
1866 }
1867 // mark hash in super block: it could be unset. overwrite should be ok
1868 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1869
1870 handle_attrs(s);
1871
1872 reiserfs_proc_info_init(s);
1873
1874 init_waitqueue_head(&(sbi->s_wait));
1875 spin_lock_init(&sbi->bitmap_lock);
1876
1877 return (0);
1878
1879 error:
1880 if (jinit_done) { /* kill the commit thread, free journal ram */
1881 journal_release_error(NULL, s);
1882 }
1883
1884 reiserfs_free_bitmap_cache(s);
1885 if (SB_BUFFER_WITH_SB(s))
1886 brelse(SB_BUFFER_WITH_SB(s));
1887 #ifdef CONFIG_QUOTA
1888 {
1889 int j;
1890 for (j = 0; j < MAXQUOTAS; j++)
1891 kfree(qf_names[j]);
1892 }
1893 #endif
1894 kfree(sbi);
1895
1896 s->s_fs_info = NULL;
1897 return errval;
1898 }
1899
1900 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1901 {
1902 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1903
1904 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1905 buf->f_bfree = sb_free_blocks(rs);
1906 buf->f_bavail = buf->f_bfree;
1907 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1908 buf->f_bsize = dentry->d_sb->s_blocksize;
1909 /* changed to accommodate gcc folks. */
1910 buf->f_type = REISERFS_SUPER_MAGIC;
1911 buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1912 buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1913 sizeof(rs->s_uuid)/2);
1914
1915 return 0;
1916 }
1917
1918 #ifdef CONFIG_QUOTA
1919 static int reiserfs_write_dquot(struct dquot *dquot)
1920 {
1921 struct reiserfs_transaction_handle th;
1922 int ret, err;
1923
1924 reiserfs_write_lock(dquot->dq_sb);
1925 ret =
1926 journal_begin(&th, dquot->dq_sb,
1927 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1928 if (ret)
1929 goto out;
1930 ret = dquot_commit(dquot);
1931 err =
1932 journal_end(&th, dquot->dq_sb,
1933 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1934 if (!ret && err)
1935 ret = err;
1936 out:
1937 reiserfs_write_unlock(dquot->dq_sb);
1938 return ret;
1939 }
1940
1941 static int reiserfs_acquire_dquot(struct dquot *dquot)
1942 {
1943 struct reiserfs_transaction_handle th;
1944 int ret, err;
1945
1946 reiserfs_write_lock(dquot->dq_sb);
1947 ret =
1948 journal_begin(&th, dquot->dq_sb,
1949 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1950 if (ret)
1951 goto out;
1952 ret = dquot_acquire(dquot);
1953 err =
1954 journal_end(&th, dquot->dq_sb,
1955 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1956 if (!ret && err)
1957 ret = err;
1958 out:
1959 reiserfs_write_unlock(dquot->dq_sb);
1960 return ret;
1961 }
1962
1963 static int reiserfs_release_dquot(struct dquot *dquot)
1964 {
1965 struct reiserfs_transaction_handle th;
1966 int ret, err;
1967
1968 reiserfs_write_lock(dquot->dq_sb);
1969 ret =
1970 journal_begin(&th, dquot->dq_sb,
1971 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1972 if (ret) {
1973 /* Release dquot anyway to avoid endless cycle in dqput() */
1974 dquot_release(dquot);
1975 goto out;
1976 }
1977 ret = dquot_release(dquot);
1978 err =
1979 journal_end(&th, dquot->dq_sb,
1980 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1981 if (!ret && err)
1982 ret = err;
1983 out:
1984 reiserfs_write_unlock(dquot->dq_sb);
1985 return ret;
1986 }
1987
1988 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1989 {
1990 /* Are we journaling quotas? */
1991 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1992 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1993 dquot_mark_dquot_dirty(dquot);
1994 return reiserfs_write_dquot(dquot);
1995 } else
1996 return dquot_mark_dquot_dirty(dquot);
1997 }
1998
1999 static int reiserfs_write_info(struct super_block *sb, int type)
2000 {
2001 struct reiserfs_transaction_handle th;
2002 int ret, err;
2003
2004 /* Data block + inode block */
2005 reiserfs_write_lock(sb);
2006 ret = journal_begin(&th, sb, 2);
2007 if (ret)
2008 goto out;
2009 ret = dquot_commit_info(sb, type);
2010 err = journal_end(&th, sb, 2);
2011 if (!ret && err)
2012 ret = err;
2013 out:
2014 reiserfs_write_unlock(sb);
2015 return ret;
2016 }
2017
2018 /*
2019 * Turn on quotas during mount time - we need to find the quota file and such...
2020 */
2021 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2022 {
2023 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2024 REISERFS_SB(sb)->s_jquota_fmt, type);
2025 }
2026
2027 /*
2028 * Standard function to be called on quota_on
2029 */
2030 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2031 char *name, int remount)
2032 {
2033 int err;
2034 struct path path;
2035 struct inode *inode;
2036 struct reiserfs_transaction_handle th;
2037
2038 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2039 return -EINVAL;
2040 /* No more checks needed? Path and format_id are bogus anyway... */
2041 if (remount)
2042 return vfs_quota_on(sb, type, format_id, name, 1);
2043 err = kern_path(name, LOOKUP_FOLLOW, &path);
2044 if (err)
2045 return err;
2046 /* Quotafile not on the same filesystem? */
2047 if (path.mnt->mnt_sb != sb) {
2048 err = -EXDEV;
2049 goto out;
2050 }
2051 inode = path.dentry->d_inode;
2052 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2053 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2054 err = reiserfs_unpack(inode, NULL);
2055 if (err) {
2056 reiserfs_warning(sb, "super-6520",
2057 "Unpacking tail of quota file failed"
2058 " (%d). Cannot turn on quotas.", err);
2059 err = -EINVAL;
2060 goto out;
2061 }
2062 mark_inode_dirty(inode);
2063 }
2064 /* Journaling quota? */
2065 if (REISERFS_SB(sb)->s_qf_names[type]) {
2066 /* Quotafile not of fs root? */
2067 if (path.dentry->d_parent != sb->s_root)
2068 reiserfs_warning(sb, "super-6521",
2069 "Quota file not on filesystem root. "
2070 "Journalled quota will not work.");
2071 }
2072
2073 /*
2074 * When we journal data on quota file, we have to flush journal to see
2075 * all updates to the file when we bypass pagecache...
2076 */
2077 if (reiserfs_file_data_log(inode)) {
2078 /* Just start temporary transaction and finish it */
2079 err = journal_begin(&th, sb, 1);
2080 if (err)
2081 goto out;
2082 err = journal_end_sync(&th, sb, 1);
2083 if (err)
2084 goto out;
2085 }
2086 err = vfs_quota_on_path(sb, type, format_id, &path);
2087 out:
2088 path_put(&path);
2089 return err;
2090 }
2091
2092 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2093 * acquiring the locks... As quota files are never truncated and quota code
2094 * itself serializes the operations (and noone else should touch the files)
2095 * we don't have to be afraid of races */
2096 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2097 size_t len, loff_t off)
2098 {
2099 struct inode *inode = sb_dqopt(sb)->files[type];
2100 unsigned long blk = off >> sb->s_blocksize_bits;
2101 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2102 size_t toread;
2103 struct buffer_head tmp_bh, *bh;
2104 loff_t i_size = i_size_read(inode);
2105
2106 if (off > i_size)
2107 return 0;
2108 if (off + len > i_size)
2109 len = i_size - off;
2110 toread = len;
2111 while (toread > 0) {
2112 tocopy =
2113 sb->s_blocksize - offset <
2114 toread ? sb->s_blocksize - offset : toread;
2115 tmp_bh.b_state = 0;
2116 /* Quota files are without tails so we can safely use this function */
2117 reiserfs_write_lock(sb);
2118 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2119 reiserfs_write_unlock(sb);
2120 if (err)
2121 return err;
2122 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2123 memset(data, 0, tocopy);
2124 else {
2125 bh = sb_bread(sb, tmp_bh.b_blocknr);
2126 if (!bh)
2127 return -EIO;
2128 memcpy(data, bh->b_data + offset, tocopy);
2129 brelse(bh);
2130 }
2131 offset = 0;
2132 toread -= tocopy;
2133 data += tocopy;
2134 blk++;
2135 }
2136 return len;
2137 }
2138
2139 /* Write to quotafile (we know the transaction is already started and has
2140 * enough credits) */
2141 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2142 const char *data, size_t len, loff_t off)
2143 {
2144 struct inode *inode = sb_dqopt(sb)->files[type];
2145 unsigned long blk = off >> sb->s_blocksize_bits;
2146 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2147 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2148 size_t towrite = len;
2149 struct buffer_head tmp_bh, *bh;
2150
2151 if (!current->journal_info) {
2152 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2153 " cancelled because transaction is not started.\n",
2154 (unsigned long long)off, (unsigned long long)len);
2155 return -EIO;
2156 }
2157 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2158 while (towrite > 0) {
2159 tocopy = sb->s_blocksize - offset < towrite ?
2160 sb->s_blocksize - offset : towrite;
2161 tmp_bh.b_state = 0;
2162 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2163 if (err)
2164 goto out;
2165 if (offset || tocopy != sb->s_blocksize)
2166 bh = sb_bread(sb, tmp_bh.b_blocknr);
2167 else
2168 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2169 if (!bh) {
2170 err = -EIO;
2171 goto out;
2172 }
2173 lock_buffer(bh);
2174 memcpy(bh->b_data + offset, data, tocopy);
2175 flush_dcache_page(bh->b_page);
2176 set_buffer_uptodate(bh);
2177 unlock_buffer(bh);
2178 reiserfs_prepare_for_journal(sb, bh, 1);
2179 journal_mark_dirty(current->journal_info, sb, bh);
2180 if (!journal_quota)
2181 reiserfs_add_ordered_list(inode, bh);
2182 brelse(bh);
2183 offset = 0;
2184 towrite -= tocopy;
2185 data += tocopy;
2186 blk++;
2187 }
2188 out:
2189 if (len == towrite) {
2190 mutex_unlock(&inode->i_mutex);
2191 return err;
2192 }
2193 if (inode->i_size < off + len - towrite)
2194 i_size_write(inode, off + len - towrite);
2195 inode->i_version++;
2196 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2197 mark_inode_dirty(inode);
2198 mutex_unlock(&inode->i_mutex);
2199 return len - towrite;
2200 }
2201
2202 #endif
2203
2204 static int get_super_block(struct file_system_type *fs_type,
2205 int flags, const char *dev_name,
2206 void *data, struct vfsmount *mnt)
2207 {
2208 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2209 mnt);
2210 }
2211
2212 static int __init init_reiserfs_fs(void)
2213 {
2214 int ret;
2215
2216 if ((ret = init_inodecache())) {
2217 return ret;
2218 }
2219
2220 reiserfs_proc_info_global_init();
2221 reiserfs_proc_register_global("version",
2222 reiserfs_global_version_in_proc);
2223
2224 ret = register_filesystem(&reiserfs_fs_type);
2225
2226 if (ret == 0) {
2227 return 0;
2228 }
2229
2230 reiserfs_proc_unregister_global("version");
2231 reiserfs_proc_info_global_done();
2232 destroy_inodecache();
2233
2234 return ret;
2235 }
2236
2237 static void __exit exit_reiserfs_fs(void)
2238 {
2239 reiserfs_proc_unregister_global("version");
2240 reiserfs_proc_info_global_done();
2241 unregister_filesystem(&reiserfs_fs_type);
2242 destroy_inodecache();
2243 }
2244
2245 struct file_system_type reiserfs_fs_type = {
2246 .owner = THIS_MODULE,
2247 .name = "reiserfs",
2248 .get_sb = get_super_block,
2249 .kill_sb = reiserfs_kill_sb,
2250 .fs_flags = FS_REQUIRES_DEV,
2251 };
2252
2253 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2254 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2255 MODULE_LICENSE("GPL");
2256
2257 module_init(init_reiserfs_fs);
2258 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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