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