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reiserfs: Remove unnecessary quota functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob317c0352163c813c9e855019322374a44d53db5d
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
31 struct file_system_type reiserfs_fs_type;
32
33 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
34 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
35 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
36
37 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
38 {
39 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
40 strlen(reiserfs_3_5_magic_string));
41 }
42
43 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
44 {
45 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
46 strlen(reiserfs_3_6_magic_string));
47 }
48
49 int is_reiserfs_jr(struct reiserfs_super_block *rs)
50 {
51 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
52 strlen(reiserfs_jr_magic_string));
53 }
54
55 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
56 {
57 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
58 is_reiserfs_jr(rs));
59 }
60
61 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
62 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
63
64 static int reiserfs_sync_fs(struct super_block *s, int wait)
65 {
66 if (!(s->s_flags & MS_RDONLY)) {
67 struct reiserfs_transaction_handle th;
68 reiserfs_write_lock(s);
69 if (!journal_begin(&th, s, 1))
70 if (!journal_end_sync(&th, s, 1))
71 reiserfs_flush_old_commits(s);
72 s->s_dirt = 0; /* Even if it's not true.
73 * We'll loop forever in sync_supers otherwise */
74 reiserfs_write_unlock(s);
75 } else {
76 s->s_dirt = 0;
77 }
78 return 0;
79 }
80
81 static void reiserfs_write_super(struct super_block *s)
82 {
83 reiserfs_sync_fs(s, 1);
84 }
85
86 static int reiserfs_freeze(struct super_block *s)
87 {
88 struct reiserfs_transaction_handle th;
89 reiserfs_write_lock(s);
90 if (!(s->s_flags & MS_RDONLY)) {
91 int err = journal_begin(&th, s, 1);
92 if (err) {
93 reiserfs_block_writes(&th);
94 } else {
95 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
96 1);
97 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
98 reiserfs_block_writes(&th);
99 journal_end_sync(&th, s, 1);
100 }
101 }
102 s->s_dirt = 0;
103 reiserfs_write_unlock(s);
104 return 0;
105 }
106
107 static int reiserfs_unfreeze(struct super_block *s)
108 {
109 reiserfs_allow_writes(s);
110 return 0;
111 }
112
113 extern const struct in_core_key MAX_IN_CORE_KEY;
114
115 /* this is used to delete "save link" when there are no items of a
116 file it points to. It can either happen if unlink is completed but
117 "save unlink" removal, or if file has both unlink and truncate
118 pending and as unlink completes first (because key of "save link"
119 protecting unlink is bigger that a key lf "save link" which
120 protects truncate), so there left no items to make truncate
121 completion on */
122 static int remove_save_link_only(struct super_block *s,
123 struct reiserfs_key *key, int oid_free)
124 {
125 struct reiserfs_transaction_handle th;
126 int err;
127
128 /* we are going to do one balancing */
129 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
130 if (err)
131 return err;
132
133 reiserfs_delete_solid_item(&th, NULL, key);
134 if (oid_free)
135 /* removals are protected by direct items */
136 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
137
138 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
139 }
140
141 #ifdef CONFIG_QUOTA
142 static int reiserfs_quota_on_mount(struct super_block *, int);
143 #endif
144
145 /* look for uncompleted unlinks and truncates and complete them */
146 static int finish_unfinished(struct super_block *s)
147 {
148 INITIALIZE_PATH(path);
149 struct cpu_key max_cpu_key, obj_key;
150 struct reiserfs_key save_link_key, last_inode_key;
151 int retval = 0;
152 struct item_head *ih;
153 struct buffer_head *bh;
154 int item_pos;
155 char *item;
156 int done;
157 struct inode *inode;
158 int truncate;
159 #ifdef CONFIG_QUOTA
160 int i;
161 int ms_active_set;
162 #endif
163
164 /* compose key to look for "save" links */
165 max_cpu_key.version = KEY_FORMAT_3_5;
166 max_cpu_key.on_disk_key.k_dir_id = ~0U;
167 max_cpu_key.on_disk_key.k_objectid = ~0U;
168 set_cpu_key_k_offset(&max_cpu_key, ~0U);
169 max_cpu_key.key_length = 3;
170
171 memset(&last_inode_key, 0, sizeof(last_inode_key));
172
173 #ifdef CONFIG_QUOTA
174 /* Needed for iput() to work correctly and not trash data */
175 if (s->s_flags & MS_ACTIVE) {
176 ms_active_set = 0;
177 } else {
178 ms_active_set = 1;
179 s->s_flags |= MS_ACTIVE;
180 }
181 /* Turn on quotas so that they are updated correctly */
182 for (i = 0; i < MAXQUOTAS; i++) {
183 if (REISERFS_SB(s)->s_qf_names[i]) {
184 int ret = reiserfs_quota_on_mount(s, i);
185 if (ret < 0)
186 reiserfs_warning(s,
187 "reiserfs: cannot turn on journaled quota: error %d",
188 ret);
189 }
190 }
191 #endif
192
193 done = 0;
194 REISERFS_SB(s)->s_is_unlinked_ok = 1;
195 while (!retval) {
196 retval = search_item(s, &max_cpu_key, &path);
197 if (retval != ITEM_NOT_FOUND) {
198 reiserfs_warning(s,
199 "vs-2140: finish_unfinished: search_by_key returned %d",
200 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,
208 "vs-2060: finish_unfinished: 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,
239 "vs-2180: finish_unfinished: iget failed for %K",
240 &obj_key);
241 retval = remove_save_link_only(s, &save_link_key, 1);
242 continue;
243 }
244
245 if (!truncate && inode->i_nlink) {
246 /* file is not unlinked */
247 reiserfs_warning(s,
248 "vs-2185: finish_unfinished: file %K is not unlinked",
249 &obj_key);
250 retval = remove_save_link_only(s, &save_link_key, 0);
251 continue;
252 }
253 DQUOT_INIT(inode);
254
255 if (truncate && S_ISDIR(inode->i_mode)) {
256 /* We got a truncate request for a dir which is impossible.
257 The only imaginable way is to execute unfinished truncate request
258 then boot into old kernel, remove the file and create dir with
259 the same key. */
260 reiserfs_warning(s,
261 "green-2101: impossible truncate on a 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, "Dead loop in "
292 "finish_unfinished detected, "
293 "just remove save link\n");
294 retval = remove_save_link_only(s,
295 &save_link_key, 0);
296 }
297 }
298
299 iput(inode);
300 printk("done\n");
301 done++;
302 }
303 REISERFS_SB(s)->s_is_unlinked_ok = 0;
304
305 #ifdef CONFIG_QUOTA
306 /* Turn quotas off */
307 for (i = 0; i < MAXQUOTAS; i++) {
308 if (sb_dqopt(s)->files[i])
309 vfs_quota_off(s, i, 0);
310 }
311 if (ms_active_set)
312 /* Restore the flag back */
313 s->s_flags &= ~MS_ACTIVE;
314 #endif
315 pathrelse(&path);
316 if (done)
317 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
318 "Completed\n", done);
319 return retval;
320 }
321
322 /* to protect file being unlinked from getting lost we "safe" link files
323 being unlinked. This link will be deleted in the same transaction with last
324 item of file. mounting the filesystem we scan all these links and remove
325 files which almost got lost */
326 void add_save_link(struct reiserfs_transaction_handle *th,
327 struct inode *inode, int truncate)
328 {
329 INITIALIZE_PATH(path);
330 int retval;
331 struct cpu_key key;
332 struct item_head ih;
333 __le32 link;
334
335 BUG_ON(!th->t_trans_id);
336
337 /* file can only get one "save link" of each kind */
338 RFALSE(truncate &&
339 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
340 "saved link already exists for truncated inode %lx",
341 (long)inode->i_ino);
342 RFALSE(!truncate &&
343 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
344 "saved link already exists for unlinked inode %lx",
345 (long)inode->i_ino);
346
347 /* setup key of "save" link */
348 key.version = KEY_FORMAT_3_5;
349 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
350 key.on_disk_key.k_objectid = inode->i_ino;
351 if (!truncate) {
352 /* unlink, rmdir, rename */
353 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
354 set_cpu_key_k_type(&key, TYPE_DIRECT);
355
356 /* item head of "safe" link */
357 make_le_item_head(&ih, &key, key.version,
358 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
359 4 /*length */ , 0xffff /*free space */ );
360 } else {
361 /* truncate */
362 if (S_ISDIR(inode->i_mode))
363 reiserfs_warning(inode->i_sb,
364 "green-2102: Adding a truncate savelink for a directory %k! Please report",
365 INODE_PKEY(inode));
366 set_cpu_key_k_offset(&key, 1);
367 set_cpu_key_k_type(&key, TYPE_INDIRECT);
368
369 /* item head of "safe" link */
370 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
371 4 /*length */ , 0 /*free space */ );
372 }
373 key.key_length = 3;
374
375 /* look for its place in the tree */
376 retval = search_item(inode->i_sb, &key, &path);
377 if (retval != ITEM_NOT_FOUND) {
378 if (retval != -ENOSPC)
379 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
380 "search_by_key (%K) returned %d", &key,
381 retval);
382 pathrelse(&path);
383 return;
384 }
385
386 /* body of "save" link */
387 link = INODE_PKEY(inode)->k_dir_id;
388
389 /* put "save" link inot tree, don't charge quota to anyone */
390 retval =
391 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
392 if (retval) {
393 if (retval != -ENOSPC)
394 reiserfs_warning(inode->i_sb,
395 "vs-2120: add_save_link: insert_item returned %d",
396 retval);
397 } else {
398 if (truncate)
399 REISERFS_I(inode)->i_flags |=
400 i_link_saved_truncate_mask;
401 else
402 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
403 }
404 }
405
406 /* this opens transaction unlike add_save_link */
407 int remove_save_link(struct inode *inode, int truncate)
408 {
409 struct reiserfs_transaction_handle th;
410 struct reiserfs_key key;
411 int err;
412
413 /* we are going to do one balancing only */
414 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
415 if (err)
416 return err;
417
418 /* setup key of "save" link */
419 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
420 key.k_objectid = INODE_PKEY(inode)->k_objectid;
421 if (!truncate) {
422 /* unlink, rmdir, rename */
423 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
424 1 + inode->i_sb->s_blocksize);
425 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
426 } else {
427 /* truncate */
428 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
429 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
430 }
431
432 if ((truncate &&
433 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
434 (!truncate &&
435 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
436 /* don't take quota bytes from anywhere */
437 reiserfs_delete_solid_item(&th, NULL, &key);
438 if (!truncate) {
439 reiserfs_release_objectid(&th, inode->i_ino);
440 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
441 } else
442 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
443
444 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
445 }
446
447 static void reiserfs_kill_sb(struct super_block *s)
448 {
449 if (REISERFS_SB(s)) {
450 #ifdef CONFIG_REISERFS_FS_XATTR
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 #endif
457 if (REISERFS_SB(s)->priv_root) {
458 d_invalidate(REISERFS_SB(s)->priv_root);
459 dput(REISERFS_SB(s)->priv_root);
460 REISERFS_SB(s)->priv_root = NULL;
461 }
462 }
463
464 kill_block_super(s);
465 }
466
467 static void reiserfs_put_super(struct super_block *s)
468 {
469 struct reiserfs_transaction_handle th;
470 th.t_trans_id = 0;
471
472 /* change file system state to current state if it was mounted with read-write permissions */
473 if (!(s->s_flags & MS_RDONLY)) {
474 if (!journal_begin(&th, s, 10)) {
475 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
476 1);
477 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
478 REISERFS_SB(s)->s_mount_state);
479 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
480 }
481 }
482
483 /* note, journal_release checks for readonly mount, and can decide not
484 ** to do a journal_end
485 */
486 journal_release(&th, s);
487
488 reiserfs_free_bitmap_cache(s);
489
490 brelse(SB_BUFFER_WITH_SB(s));
491
492 print_statistics(s);
493
494 if (REISERFS_SB(s)->reserved_blocks != 0) {
495 reiserfs_warning(s,
496 "green-2005: reiserfs_put_super: 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,
563 "clm-6006: 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, "%s not supported.",
796 p);
797 else
798 *bit_flags &= ~opt->clrmask;
799 if (opt->setmask ==
800 (1 << REISERFS_UNSUPPORTED_OPT))
801 reiserfs_warning(s, "%s not supported.",
802 p);
803 else
804 *bit_flags |= opt->setmask;
805 }
806 break;
807 }
808 }
809 if (!opt->option_name) {
810 reiserfs_warning(s, "unknown mount option \"%s\"", p);
811 return -1;
812 }
813
814 p += strlen(opt->option_name);
815 switch (*p) {
816 case '=':
817 if (!opt->arg_required) {
818 reiserfs_warning(s,
819 "the option \"%s\" does not require an argument",
820 opt->option_name);
821 return -1;
822 }
823 break;
824
825 case 0:
826 if (opt->arg_required) {
827 reiserfs_warning(s,
828 "the option \"%s\" requires an argument",
829 opt->option_name);
830 return -1;
831 }
832 break;
833 default:
834 reiserfs_warning(s, "head of option \"%s\" is only correct",
835 opt->option_name);
836 return -1;
837 }
838
839 /* move to the argument, or to next option if argument is not required */
840 p++;
841
842 if (opt->arg_required
843 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
844 && !strlen(p)) {
845 /* this catches "option=," if not allowed */
846 reiserfs_warning(s, "empty argument for \"%s\"",
847 opt->option_name);
848 return -1;
849 }
850
851 if (!opt->values) {
852 /* *=NULLopt_arg contains pointer to argument */
853 *opt_arg = p;
854 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
855 }
856
857 /* values possible for this option are listed in opt->values */
858 for (arg = opt->values; arg->value; arg++) {
859 if (!strcmp(p, arg->value)) {
860 if (bit_flags) {
861 *bit_flags &= ~arg->clrmask;
862 *bit_flags |= arg->setmask;
863 }
864 return opt->arg_required;
865 }
866 }
867
868 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
869 opt->option_name);
870 return -1;
871 }
872
873 /* returns 0 if something is wrong in option string, 1 - otherwise */
874 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
875 unsigned long *mount_options,
876 /* after the parsing phase, contains the
877 collection of bitflags defining what
878 mount options were selected. */
879 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
880 char **jdev_name,
881 unsigned int *commit_max_age,
882 char **qf_names,
883 unsigned int *qfmt)
884 {
885 int c;
886 char *arg = NULL;
887 char *pos;
888 opt_desc_t opts[] = {
889 /* Compatibility stuff, so that -o notail for old setups still work */
890 {"tails",.arg_required = 't',.values = tails},
891 {"notail",.clrmask =
892 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
893 {"conv",.setmask = 1 << REISERFS_CONVERT},
894 {"attrs",.setmask = 1 << REISERFS_ATTRS},
895 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
896 #ifdef CONFIG_REISERFS_FS_XATTR
897 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
898 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
899 #else
900 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
901 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
902 #endif
903 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
904 {"acl",.setmask = 1 << REISERFS_POSIXACL},
905 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
906 #else
907 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
909 #endif
910 {.option_name = "nolog"},
911 {"replayonly",.setmask = 1 << REPLAYONLY},
912 {"block-allocator",.arg_required = 'a',.values = balloc},
913 {"data",.arg_required = 'd',.values = logging_mode},
914 {"barrier",.arg_required = 'b',.values = barrier_mode},
915 {"resize",.arg_required = 'r',.values = NULL},
916 {"jdev",.arg_required = 'j',.values = NULL},
917 {"nolargeio",.arg_required = 'w',.values = NULL},
918 {"commit",.arg_required = 'c',.values = NULL},
919 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
920 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
921 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
922 {"errors",.arg_required = 'e',.values = error_actions},
923 {"usrjquota",.arg_required =
924 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
925 {"grpjquota",.arg_required =
926 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
927 {"jqfmt",.arg_required = 'f',.values = NULL},
928 {.option_name = NULL}
929 };
930
931 *blocks = 0;
932 if (!options || !*options)
933 /* use default configuration: create tails, journaling on, no
934 conversion to newest format */
935 return 1;
936
937 for (pos = options; pos;) {
938 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
939 if (c == -1)
940 /* wrong option is given */
941 return 0;
942
943 if (c == 'r') {
944 char *p;
945
946 p = NULL;
947 /* "resize=NNN" or "resize=auto" */
948
949 if (!strcmp(arg, "auto")) {
950 /* From JFS code, to auto-get the size. */
951 *blocks =
952 s->s_bdev->bd_inode->i_size >> s->
953 s_blocksize_bits;
954 } else {
955 *blocks = simple_strtoul(arg, &p, 0);
956 if (*p != '\0') {
957 /* NNN does not look like a number */
958 reiserfs_warning(s,
959 "reiserfs_parse_options: bad value %s",
960 arg);
961 return 0;
962 }
963 }
964 }
965
966 if (c == 'c') {
967 char *p = NULL;
968 unsigned long val = simple_strtoul(arg, &p, 0);
969 /* commit=NNN (time in seconds) */
970 if (*p != '\0' || val >= (unsigned int)-1) {
971 reiserfs_warning(s,
972 "reiserfs_parse_options: bad value %s",
973 arg);
974 return 0;
975 }
976 *commit_max_age = (unsigned int)val;
977 }
978
979 if (c == 'w') {
980 reiserfs_warning(s, "reiserfs: nolargeio option is no longer supported");
981 return 0;
982 }
983
984 if (c == 'j') {
985 if (arg && *arg && jdev_name) {
986 if (*jdev_name) { //Hm, already assigned?
987 reiserfs_warning(s,
988 "reiserfs_parse_options: journal device was already specified to be %s",
989 *jdev_name);
990 return 0;
991 }
992 *jdev_name = arg;
993 }
994 }
995 #ifdef CONFIG_QUOTA
996 if (c == 'u' || c == 'g') {
997 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
998
999 if (sb_any_quota_loaded(s) &&
1000 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1001 reiserfs_warning(s,
1002 "reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
1003 return 0;
1004 }
1005 if (*arg) { /* Some filename specified? */
1006 if (REISERFS_SB(s)->s_qf_names[qtype]
1007 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1008 arg)) {
1009 reiserfs_warning(s,
1010 "reiserfs_parse_options: %s quota file already specified.",
1011 QTYPE2NAME(qtype));
1012 return 0;
1013 }
1014 if (strchr(arg, '/')) {
1015 reiserfs_warning(s,
1016 "reiserfs_parse_options: quotafile must be on filesystem root.");
1017 return 0;
1018 }
1019 qf_names[qtype] =
1020 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1021 if (!qf_names[qtype]) {
1022 reiserfs_warning(s,
1023 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1024 return 0;
1025 }
1026 strcpy(qf_names[qtype], arg);
1027 *mount_options |= 1 << REISERFS_QUOTA;
1028 } else {
1029 if (qf_names[qtype] !=
1030 REISERFS_SB(s)->s_qf_names[qtype])
1031 kfree(qf_names[qtype]);
1032 qf_names[qtype] = NULL;
1033 }
1034 }
1035 if (c == 'f') {
1036 if (!strcmp(arg, "vfsold"))
1037 *qfmt = QFMT_VFS_OLD;
1038 else if (!strcmp(arg, "vfsv0"))
1039 *qfmt = QFMT_VFS_V0;
1040 else {
1041 reiserfs_warning(s,
1042 "reiserfs_parse_options: unknown quota format specified.");
1043 return 0;
1044 }
1045 if (sb_any_quota_loaded(s) &&
1046 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1047 reiserfs_warning(s,
1048 "reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
1049 return 0;
1050 }
1051 }
1052 #else
1053 if (c == 'u' || c == 'g' || c == 'f') {
1054 reiserfs_warning(s,
1055 "reiserfs_parse_options: journaled quota options not supported.");
1056 return 0;
1057 }
1058 #endif
1059 }
1060
1061 #ifdef CONFIG_QUOTA
1062 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1063 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1064 reiserfs_warning(s,
1065 "reiserfs_parse_options: journaled quota format not specified.");
1066 return 0;
1067 }
1068 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1069 if (!(*mount_options & (1 << REISERFS_QUOTA))
1070 && sb_any_quota_loaded(s)) {
1071 reiserfs_warning(s,
1072 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1073 return 0;
1074 }
1075 #endif
1076
1077 return 1;
1078 }
1079
1080 static void switch_data_mode(struct super_block *s, unsigned long mode)
1081 {
1082 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1083 (1 << REISERFS_DATA_ORDERED) |
1084 (1 << REISERFS_DATA_WRITEBACK));
1085 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1086 }
1087
1088 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1089 {
1090 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1091 if (!reiserfs_data_log(s)) {
1092 switch_data_mode(s, REISERFS_DATA_LOG);
1093 reiserfs_info(s, "switching to journaled data mode\n");
1094 }
1095 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1096 if (!reiserfs_data_ordered(s)) {
1097 switch_data_mode(s, REISERFS_DATA_ORDERED);
1098 reiserfs_info(s, "switching to ordered data mode\n");
1099 }
1100 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1101 if (!reiserfs_data_writeback(s)) {
1102 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1103 reiserfs_info(s, "switching to writeback data mode\n");
1104 }
1105 }
1106 }
1107
1108 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1109 {
1110 int flush = (1 << REISERFS_BARRIER_FLUSH);
1111 int none = (1 << REISERFS_BARRIER_NONE);
1112 int all_barrier = flush | none;
1113
1114 if (bits & all_barrier) {
1115 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1116 if (bits & flush) {
1117 REISERFS_SB(s)->s_mount_opt |= flush;
1118 printk("reiserfs: enabling write barrier flush mode\n");
1119 } else if (bits & none) {
1120 REISERFS_SB(s)->s_mount_opt |= none;
1121 printk("reiserfs: write barriers turned off\n");
1122 }
1123 }
1124 }
1125
1126 static void handle_attrs(struct super_block *s)
1127 {
1128 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1129
1130 if (reiserfs_attrs(s)) {
1131 if (old_format_only(s)) {
1132 reiserfs_warning(s,
1133 "reiserfs: cannot support attributes on 3.5.x disk format");
1134 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1135 return;
1136 }
1137 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1138 reiserfs_warning(s,
1139 "reiserfs: cannot support attributes until flag is set in super-block");
1140 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1141 }
1142 }
1143 }
1144
1145 #ifdef CONFIG_QUOTA
1146 static void handle_quota_files(struct super_block *s, char **qf_names,
1147 unsigned int *qfmt)
1148 {
1149 int i;
1150
1151 for (i = 0; i < MAXQUOTAS; i++) {
1152 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1153 kfree(REISERFS_SB(s)->s_qf_names[i]);
1154 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1155 }
1156 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1157 }
1158 #endif
1159
1160 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1161 {
1162 struct reiserfs_super_block *rs;
1163 struct reiserfs_transaction_handle th;
1164 unsigned long blocks;
1165 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1166 unsigned long safe_mask = 0;
1167 unsigned int commit_max_age = (unsigned int)-1;
1168 struct reiserfs_journal *journal = SB_JOURNAL(s);
1169 char *new_opts = kstrdup(arg, GFP_KERNEL);
1170 int err;
1171 char *qf_names[MAXQUOTAS];
1172 unsigned int qfmt = 0;
1173 #ifdef CONFIG_QUOTA
1174 int i;
1175
1176 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1177 #endif
1178
1179 rs = SB_DISK_SUPER_BLOCK(s);
1180
1181 if (!reiserfs_parse_options
1182 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1183 qf_names, &qfmt)) {
1184 #ifdef CONFIG_QUOTA
1185 for (i = 0; i < MAXQUOTAS; i++)
1186 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1187 kfree(qf_names[i]);
1188 #endif
1189 err = -EINVAL;
1190 goto out_err;
1191 }
1192 #ifdef CONFIG_QUOTA
1193 handle_quota_files(s, qf_names, &qfmt);
1194 #endif
1195
1196 handle_attrs(s);
1197
1198 /* Add options that are safe here */
1199 safe_mask |= 1 << REISERFS_SMALLTAIL;
1200 safe_mask |= 1 << REISERFS_LARGETAIL;
1201 safe_mask |= 1 << REISERFS_NO_BORDER;
1202 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1203 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1204 safe_mask |= 1 << REISERFS_TEST4;
1205 safe_mask |= 1 << REISERFS_ATTRS;
1206 safe_mask |= 1 << REISERFS_XATTRS_USER;
1207 safe_mask |= 1 << REISERFS_POSIXACL;
1208 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1209 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1210 safe_mask |= 1 << REISERFS_ERROR_RO;
1211 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1212 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1213 safe_mask |= 1 << REISERFS_QUOTA;
1214
1215 /* Update the bitmask, taking care to keep
1216 * the bits we're not allowed to change here */
1217 REISERFS_SB(s)->s_mount_opt =
1218 (REISERFS_SB(s)->
1219 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1220
1221 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1222 journal->j_max_commit_age = commit_max_age;
1223 journal->j_max_trans_age = commit_max_age;
1224 } else if (commit_max_age == 0) {
1225 /* 0 means restore defaults. */
1226 journal->j_max_commit_age = journal->j_default_max_commit_age;
1227 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1228 }
1229
1230 if (blocks) {
1231 err = reiserfs_resize(s, blocks);
1232 if (err != 0)
1233 goto out_err;
1234 }
1235
1236 if (*mount_flags & MS_RDONLY) {
1237 reiserfs_xattr_init(s, *mount_flags);
1238 /* remount read-only */
1239 if (s->s_flags & MS_RDONLY)
1240 /* it is read-only already */
1241 goto out_ok;
1242 /* try to remount file system with read-only permissions */
1243 if (sb_umount_state(rs) == REISERFS_VALID_FS
1244 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1245 goto out_ok;
1246 }
1247
1248 err = journal_begin(&th, s, 10);
1249 if (err)
1250 goto out_err;
1251
1252 /* Mounting a rw partition read-only. */
1253 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1254 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1255 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1256 } else {
1257 /* remount read-write */
1258 if (!(s->s_flags & MS_RDONLY)) {
1259 reiserfs_xattr_init(s, *mount_flags);
1260 goto out_ok; /* We are read-write already */
1261 }
1262
1263 if (reiserfs_is_journal_aborted(journal)) {
1264 err = journal->j_errno;
1265 goto out_err;
1266 }
1267
1268 handle_data_mode(s, mount_options);
1269 handle_barrier_mode(s, mount_options);
1270 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1271 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1272 err = journal_begin(&th, s, 10);
1273 if (err)
1274 goto out_err;
1275
1276 /* Mount a partition which is read-only, read-write */
1277 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1278 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1279 s->s_flags &= ~MS_RDONLY;
1280 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1281 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1282 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1283 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1284 }
1285 /* this will force a full flush of all journal lists */
1286 SB_JOURNAL(s)->j_must_wait = 1;
1287 err = journal_end(&th, s, 10);
1288 if (err)
1289 goto out_err;
1290 s->s_dirt = 0;
1291
1292 if (!(*mount_flags & MS_RDONLY)) {
1293 finish_unfinished(s);
1294 reiserfs_xattr_init(s, *mount_flags);
1295 }
1296
1297 out_ok:
1298 kfree(s->s_options);
1299 s->s_options = new_opts;
1300 return 0;
1301
1302 out_err:
1303 kfree(new_opts);
1304 return err;
1305 }
1306
1307 static int read_super_block(struct super_block *s, int offset)
1308 {
1309 struct buffer_head *bh;
1310 struct reiserfs_super_block *rs;
1311 int fs_blocksize;
1312
1313 bh = sb_bread(s, offset / s->s_blocksize);
1314 if (!bh) {
1315 reiserfs_warning(s, "sh-2006: read_super_block: "
1316 "bread failed (dev %s, block %lu, size %lu)",
1317 reiserfs_bdevname(s), offset / s->s_blocksize,
1318 s->s_blocksize);
1319 return 1;
1320 }
1321
1322 rs = (struct reiserfs_super_block *)bh->b_data;
1323 if (!is_any_reiserfs_magic_string(rs)) {
1324 brelse(bh);
1325 return 1;
1326 }
1327 //
1328 // ok, reiserfs signature (old or new) found in at the given offset
1329 //
1330 fs_blocksize = sb_blocksize(rs);
1331 brelse(bh);
1332 sb_set_blocksize(s, fs_blocksize);
1333
1334 bh = sb_bread(s, offset / s->s_blocksize);
1335 if (!bh) {
1336 reiserfs_warning(s, "sh-2007: read_super_block: "
1337 "bread failed (dev %s, block %lu, size %lu)\n",
1338 reiserfs_bdevname(s), offset / s->s_blocksize,
1339 s->s_blocksize);
1340 return 1;
1341 }
1342
1343 rs = (struct reiserfs_super_block *)bh->b_data;
1344 if (sb_blocksize(rs) != s->s_blocksize) {
1345 reiserfs_warning(s, "sh-2011: read_super_block: "
1346 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1347 reiserfs_bdevname(s),
1348 (unsigned long long)bh->b_blocknr,
1349 s->s_blocksize);
1350 brelse(bh);
1351 return 1;
1352 }
1353
1354 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1355 brelse(bh);
1356 reiserfs_warning(s,
1357 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1358 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1359 "get newer reiserfsprogs package");
1360 return 1;
1361 }
1362
1363 SB_BUFFER_WITH_SB(s) = bh;
1364 SB_DISK_SUPER_BLOCK(s) = rs;
1365
1366 if (is_reiserfs_jr(rs)) {
1367 /* magic is of non-standard journal filesystem, look at s_version to
1368 find which format is in use */
1369 if (sb_version(rs) == REISERFS_VERSION_2)
1370 reiserfs_warning(s,
1371 "read_super_block: found reiserfs format \"3.6\""
1372 " with non-standard journal");
1373 else if (sb_version(rs) == REISERFS_VERSION_1)
1374 reiserfs_warning(s,
1375 "read_super_block: found reiserfs format \"3.5\""
1376 " with non-standard journal");
1377 else {
1378 reiserfs_warning(s,
1379 "sh-2012: read_super_block: found unknown "
1380 "format \"%u\" of reiserfs with non-standard magic",
1381 sb_version(rs));
1382 return 1;
1383 }
1384 } else
1385 /* s_version of standard format may contain incorrect information,
1386 so we just look at the magic string */
1387 reiserfs_info(s,
1388 "found reiserfs format \"%s\" with standard journal\n",
1389 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1390
1391 s->s_op = &reiserfs_sops;
1392 s->s_export_op = &reiserfs_export_ops;
1393 #ifdef CONFIG_QUOTA
1394 s->s_qcop = &reiserfs_qctl_operations;
1395 s->dq_op = &reiserfs_quota_operations;
1396 #endif
1397
1398 /* new format is limited by the 32 bit wide i_blocks field, want to
1399 ** be one full block below that.
1400 */
1401 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1402 return 0;
1403 }
1404
1405 /* after journal replay, reread all bitmap and super blocks */
1406 static int reread_meta_blocks(struct super_block *s)
1407 {
1408 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1409 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1410 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1411 reiserfs_warning(s,
1412 "reread_meta_blocks, error reading the super");
1413 return 1;
1414 }
1415
1416 return 0;
1417 }
1418
1419 /////////////////////////////////////////////////////
1420 // hash detection stuff
1421
1422 // if root directory is empty - we set default - Yura's - hash and
1423 // warn about it
1424 // FIXME: we look for only one name in a directory. If tea and yura
1425 // bith have the same value - we ask user to send report to the
1426 // mailing list
1427 static __u32 find_hash_out(struct super_block *s)
1428 {
1429 int retval;
1430 struct inode *inode;
1431 struct cpu_key key;
1432 INITIALIZE_PATH(path);
1433 struct reiserfs_dir_entry de;
1434 __u32 hash = DEFAULT_HASH;
1435
1436 inode = s->s_root->d_inode;
1437
1438 do { // Some serious "goto"-hater was there ;)
1439 u32 teahash, r5hash, yurahash;
1440
1441 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1442 retval = search_by_entry_key(s, &key, &path, &de);
1443 if (retval == IO_ERROR) {
1444 pathrelse(&path);
1445 return UNSET_HASH;
1446 }
1447 if (retval == NAME_NOT_FOUND)
1448 de.de_entry_num--;
1449 set_de_name_and_namelen(&de);
1450 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1451 /* allow override in this case */
1452 if (reiserfs_rupasov_hash(s)) {
1453 hash = YURA_HASH;
1454 }
1455 reiserfs_warning(s, "FS seems to be empty, autodetect "
1456 "is using the default hash");
1457 break;
1458 }
1459 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1460 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1461 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1462 if (((teahash == r5hash)
1463 &&
1464 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1465 == r5hash)) || ((teahash == yurahash)
1466 && (yurahash ==
1467 GET_HASH_VALUE(deh_offset
1468 (&
1469 (de.
1470 de_deh[de.
1471 de_entry_num])))))
1472 || ((r5hash == yurahash)
1473 && (yurahash ==
1474 GET_HASH_VALUE(deh_offset
1475 (&(de.de_deh[de.de_entry_num])))))) {
1476 reiserfs_warning(s,
1477 "Unable to automatically detect hash function. "
1478 "Please mount with -o hash={tea,rupasov,r5}",
1479 reiserfs_bdevname(s));
1480 hash = UNSET_HASH;
1481 break;
1482 }
1483 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1484 yurahash)
1485 hash = YURA_HASH;
1486 else if (GET_HASH_VALUE
1487 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1488 hash = TEA_HASH;
1489 else if (GET_HASH_VALUE
1490 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1491 hash = R5_HASH;
1492 else {
1493 reiserfs_warning(s, "Unrecognised hash function");
1494 hash = UNSET_HASH;
1495 }
1496 } while (0);
1497
1498 pathrelse(&path);
1499 return hash;
1500 }
1501
1502 // finds out which hash names are sorted with
1503 static int what_hash(struct super_block *s)
1504 {
1505 __u32 code;
1506
1507 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1508
1509 /* reiserfs_hash_detect() == true if any of the hash mount options
1510 ** were used. We must check them to make sure the user isn't
1511 ** using a bad hash value
1512 */
1513 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1514 code = find_hash_out(s);
1515
1516 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1517 /* detection has found the hash, and we must check against the
1518 ** mount options
1519 */
1520 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1521 reiserfs_warning(s, "Error, %s hash detected, "
1522 "unable to force rupasov hash",
1523 reiserfs_hashname(code));
1524 code = UNSET_HASH;
1525 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1526 reiserfs_warning(s, "Error, %s hash detected, "
1527 "unable to force tea hash",
1528 reiserfs_hashname(code));
1529 code = UNSET_HASH;
1530 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1531 reiserfs_warning(s, "Error, %s hash detected, "
1532 "unable to force r5 hash",
1533 reiserfs_hashname(code));
1534 code = UNSET_HASH;
1535 }
1536 } else {
1537 /* find_hash_out was not called or could not determine the hash */
1538 if (reiserfs_rupasov_hash(s)) {
1539 code = YURA_HASH;
1540 } else if (reiserfs_tea_hash(s)) {
1541 code = TEA_HASH;
1542 } else if (reiserfs_r5_hash(s)) {
1543 code = R5_HASH;
1544 }
1545 }
1546
1547 /* if we are mounted RW, and we have a new valid hash code, update
1548 ** the super
1549 */
1550 if (code != UNSET_HASH &&
1551 !(s->s_flags & MS_RDONLY) &&
1552 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1553 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1554 }
1555 return code;
1556 }
1557
1558 // return pointer to appropriate function
1559 static hashf_t hash_function(struct super_block *s)
1560 {
1561 switch (what_hash(s)) {
1562 case TEA_HASH:
1563 reiserfs_info(s, "Using tea hash to sort names\n");
1564 return keyed_hash;
1565 case YURA_HASH:
1566 reiserfs_info(s, "Using rupasov hash to sort names\n");
1567 return yura_hash;
1568 case R5_HASH:
1569 reiserfs_info(s, "Using r5 hash to sort names\n");
1570 return r5_hash;
1571 }
1572 return NULL;
1573 }
1574
1575 // this is used to set up correct value for old partitions
1576 static int function2code(hashf_t func)
1577 {
1578 if (func == keyed_hash)
1579 return TEA_HASH;
1580 if (func == yura_hash)
1581 return YURA_HASH;
1582 if (func == r5_hash)
1583 return R5_HASH;
1584
1585 BUG(); // should never happen
1586
1587 return 0;
1588 }
1589
1590 #define SWARN(silent, s, ...) \
1591 if (!(silent)) \
1592 reiserfs_warning (s, __VA_ARGS__)
1593
1594 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1595 {
1596 struct inode *root_inode;
1597 struct reiserfs_transaction_handle th;
1598 int old_format = 0;
1599 unsigned long blocks;
1600 unsigned int commit_max_age = 0;
1601 int jinit_done = 0;
1602 struct reiserfs_iget_args args;
1603 struct reiserfs_super_block *rs;
1604 char *jdev_name;
1605 struct reiserfs_sb_info *sbi;
1606 int errval = -EINVAL;
1607 char *qf_names[MAXQUOTAS] = {};
1608 unsigned int qfmt = 0;
1609
1610 save_mount_options(s, data);
1611
1612 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1613 if (!sbi) {
1614 errval = -ENOMEM;
1615 goto error;
1616 }
1617 s->s_fs_info = sbi;
1618 /* Set default values for options: non-aggressive tails, RO on errors */
1619 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1620 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1621 /* no preallocation minimum, be smart in
1622 reiserfs_file_write instead */
1623 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1624 /* Preallocate by 16 blocks (17-1) at once */
1625 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1626 #ifdef CONFIG_REISERFS_FS_XATTR
1627 /* Initialize the rwsem for xattr dir */
1628 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1629 #endif
1630 /* setup default block allocator options */
1631 reiserfs_init_alloc_options(s);
1632
1633 jdev_name = NULL;
1634 if (reiserfs_parse_options
1635 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1636 &commit_max_age, qf_names, &qfmt) == 0) {
1637 goto error;
1638 }
1639 #ifdef CONFIG_QUOTA
1640 handle_quota_files(s, qf_names, &qfmt);
1641 #endif
1642
1643 if (blocks) {
1644 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1645 "for remount only");
1646 goto error;
1647 }
1648
1649 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1650 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1651 old_format = 1;
1652 /* try new format (64-th 1k block), which can contain reiserfs super block */
1653 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1654 SWARN(silent, s,
1655 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1656 reiserfs_bdevname(s));
1657 goto error;
1658 }
1659
1660 rs = SB_DISK_SUPER_BLOCK(s);
1661 /* Let's do basic sanity check to verify that underlying device is not
1662 smaller than the filesystem. If the check fails then abort and scream,
1663 because bad stuff will happen otherwise. */
1664 if (s->s_bdev && s->s_bdev->bd_inode
1665 && i_size_read(s->s_bdev->bd_inode) <
1666 sb_block_count(rs) * sb_blocksize(rs)) {
1667 SWARN(silent, s,
1668 "Filesystem on %s cannot be mounted because it is bigger than the device",
1669 reiserfs_bdevname(s));
1670 SWARN(silent, s,
1671 "You may need to run fsck or increase size of your LVM partition");
1672 SWARN(silent, s,
1673 "Or may be you forgot to reboot after fdisk when it told you to");
1674 goto error;
1675 }
1676
1677 sbi->s_mount_state = SB_REISERFS_STATE(s);
1678 sbi->s_mount_state = REISERFS_VALID_FS;
1679
1680 if ((errval = reiserfs_init_bitmap_cache(s))) {
1681 SWARN(silent, s,
1682 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1683 goto error;
1684 }
1685 errval = -EINVAL;
1686 #ifdef CONFIG_REISERFS_CHECK
1687 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1688 SWARN(silent, s, "- it is slow mode for debugging.");
1689 #endif
1690
1691 /* make data=ordered the default */
1692 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1693 !reiserfs_data_writeback(s)) {
1694 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1695 }
1696
1697 if (reiserfs_data_log(s)) {
1698 reiserfs_info(s, "using journaled data mode\n");
1699 } else if (reiserfs_data_ordered(s)) {
1700 reiserfs_info(s, "using ordered data mode\n");
1701 } else {
1702 reiserfs_info(s, "using writeback data mode\n");
1703 }
1704 if (reiserfs_barrier_flush(s)) {
1705 printk("reiserfs: using flush barriers\n");
1706 }
1707 // set_device_ro(s->s_dev, 1) ;
1708 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1709 SWARN(silent, s,
1710 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1711 goto error;
1712 } else {
1713 jinit_done = 1; /* once this is set, journal_release must be called
1714 ** if we error out of the mount
1715 */
1716 }
1717 if (reread_meta_blocks(s)) {
1718 SWARN(silent, s,
1719 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1720 goto error;
1721 }
1722
1723 if (replay_only(s))
1724 goto error;
1725
1726 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1727 SWARN(silent, s,
1728 "clm-7000: Detected readonly device, marking FS readonly");
1729 s->s_flags |= MS_RDONLY;
1730 }
1731 args.objectid = REISERFS_ROOT_OBJECTID;
1732 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1733 root_inode =
1734 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1735 reiserfs_init_locked_inode, (void *)(&args));
1736 if (!root_inode) {
1737 SWARN(silent, s,
1738 "jmacd-10: reiserfs_fill_super: get root inode failed");
1739 goto error;
1740 }
1741
1742 if (root_inode->i_state & I_NEW) {
1743 reiserfs_read_locked_inode(root_inode, &args);
1744 unlock_new_inode(root_inode);
1745 }
1746
1747 s->s_root = d_alloc_root(root_inode);
1748 if (!s->s_root) {
1749 iput(root_inode);
1750 goto error;
1751 }
1752 // define and initialize hash function
1753 sbi->s_hash_function = hash_function(s);
1754 if (sbi->s_hash_function == NULL) {
1755 dput(s->s_root);
1756 s->s_root = NULL;
1757 goto error;
1758 }
1759
1760 if (is_reiserfs_3_5(rs)
1761 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1762 set_bit(REISERFS_3_5, &(sbi->s_properties));
1763 else if (old_format)
1764 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1765 else
1766 set_bit(REISERFS_3_6, &(sbi->s_properties));
1767
1768 if (!(s->s_flags & MS_RDONLY)) {
1769
1770 errval = journal_begin(&th, s, 1);
1771 if (errval) {
1772 dput(s->s_root);
1773 s->s_root = NULL;
1774 goto error;
1775 }
1776 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1777
1778 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1779 set_sb_fs_state(rs, 0);
1780
1781 /* Clear out s_bmap_nr if it would wrap. We can handle this
1782 * case, but older revisions can't. This will cause the
1783 * file system to fail mount on those older implementations,
1784 * avoiding corruption. -jeffm */
1785 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1786 sb_bmap_nr(rs) != 0) {
1787 reiserfs_warning(s, "super-2030: This file system "
1788 "claims to use %u bitmap blocks in "
1789 "its super block, but requires %u. "
1790 "Clearing to zero.", sb_bmap_nr(rs),
1791 reiserfs_bmap_count(s));
1792
1793 set_sb_bmap_nr(rs, 0);
1794 }
1795
1796 if (old_format_only(s)) {
1797 /* filesystem of format 3.5 either with standard or non-standard
1798 journal */
1799 if (convert_reiserfs(s)) {
1800 /* and -o conv is given */
1801 if (!silent)
1802 reiserfs_info(s,
1803 "converting 3.5 filesystem to the 3.6 format");
1804
1805 if (is_reiserfs_3_5(rs))
1806 /* put magic string of 3.6 format. 2.2 will not be able to
1807 mount this filesystem anymore */
1808 memcpy(rs->s_v1.s_magic,
1809 reiserfs_3_6_magic_string,
1810 sizeof
1811 (reiserfs_3_6_magic_string));
1812
1813 set_sb_version(rs, REISERFS_VERSION_2);
1814 reiserfs_convert_objectid_map_v1(s);
1815 set_bit(REISERFS_3_6, &(sbi->s_properties));
1816 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1817 } else if (!silent) {
1818 reiserfs_info(s, "using 3.5.x disk format\n");
1819 }
1820 }
1821
1822 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1823 errval = journal_end(&th, s, 1);
1824 if (errval) {
1825 dput(s->s_root);
1826 s->s_root = NULL;
1827 goto error;
1828 }
1829
1830 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1831 dput(s->s_root);
1832 s->s_root = NULL;
1833 goto error;
1834 }
1835
1836 /* look for files which were to be removed in previous session */
1837 finish_unfinished(s);
1838 } else {
1839 if (old_format_only(s) && !silent) {
1840 reiserfs_info(s, "using 3.5.x disk format\n");
1841 }
1842
1843 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1844 dput(s->s_root);
1845 s->s_root = NULL;
1846 goto error;
1847 }
1848 }
1849 // mark hash in super block: it could be unset. overwrite should be ok
1850 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1851
1852 handle_attrs(s);
1853
1854 reiserfs_proc_info_init(s);
1855
1856 init_waitqueue_head(&(sbi->s_wait));
1857 spin_lock_init(&sbi->bitmap_lock);
1858
1859 return (0);
1860
1861 error:
1862 if (jinit_done) { /* kill the commit thread, free journal ram */
1863 journal_release_error(NULL, s);
1864 }
1865
1866 reiserfs_free_bitmap_cache(s);
1867 if (SB_BUFFER_WITH_SB(s))
1868 brelse(SB_BUFFER_WITH_SB(s));
1869 #ifdef CONFIG_QUOTA
1870 {
1871 int j;
1872 for (j = 0; j < MAXQUOTAS; j++)
1873 kfree(qf_names[j]);
1874 }
1875 #endif
1876 kfree(sbi);
1877
1878 s->s_fs_info = NULL;
1879 return errval;
1880 }
1881
1882 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1883 {
1884 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1885
1886 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1887 buf->f_bfree = sb_free_blocks(rs);
1888 buf->f_bavail = buf->f_bfree;
1889 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1890 buf->f_bsize = dentry->d_sb->s_blocksize;
1891 /* changed to accommodate gcc folks. */
1892 buf->f_type = REISERFS_SUPER_MAGIC;
1893 return 0;
1894 }
1895
1896 #ifdef CONFIG_QUOTA
1897 static int reiserfs_write_dquot(struct dquot *dquot)
1898 {
1899 struct reiserfs_transaction_handle th;
1900 int ret, err;
1901
1902 reiserfs_write_lock(dquot->dq_sb);
1903 ret =
1904 journal_begin(&th, dquot->dq_sb,
1905 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1906 if (ret)
1907 goto out;
1908 ret = dquot_commit(dquot);
1909 err =
1910 journal_end(&th, dquot->dq_sb,
1911 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1912 if (!ret && err)
1913 ret = err;
1914 out:
1915 reiserfs_write_unlock(dquot->dq_sb);
1916 return ret;
1917 }
1918
1919 static int reiserfs_acquire_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_INIT_BLOCKS(dquot->dq_sb));
1928 if (ret)
1929 goto out;
1930 ret = dquot_acquire(dquot);
1931 err =
1932 journal_end(&th, dquot->dq_sb,
1933 REISERFS_QUOTA_INIT_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_release_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_DEL_BLOCKS(dquot->dq_sb));
1950 if (ret) {
1951 /* Release dquot anyway to avoid endless cycle in dqput() */
1952 dquot_release(dquot);
1953 goto out;
1954 }
1955 ret = dquot_release(dquot);
1956 err =
1957 journal_end(&th, dquot->dq_sb,
1958 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1959 if (!ret && err)
1960 ret = err;
1961 out:
1962 reiserfs_write_unlock(dquot->dq_sb);
1963 return ret;
1964 }
1965
1966 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1967 {
1968 /* Are we journaling quotas? */
1969 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1970 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1971 dquot_mark_dquot_dirty(dquot);
1972 return reiserfs_write_dquot(dquot);
1973 } else
1974 return dquot_mark_dquot_dirty(dquot);
1975 }
1976
1977 static int reiserfs_write_info(struct super_block *sb, int type)
1978 {
1979 struct reiserfs_transaction_handle th;
1980 int ret, err;
1981
1982 /* Data block + inode block */
1983 reiserfs_write_lock(sb);
1984 ret = journal_begin(&th, sb, 2);
1985 if (ret)
1986 goto out;
1987 ret = dquot_commit_info(sb, type);
1988 err = journal_end(&th, sb, 2);
1989 if (!ret && err)
1990 ret = err;
1991 out:
1992 reiserfs_write_unlock(sb);
1993 return ret;
1994 }
1995
1996 /*
1997 * Turn on quotas during mount time - we need to find the quota file and such...
1998 */
1999 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2000 {
2001 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2002 REISERFS_SB(sb)->s_jquota_fmt, type);
2003 }
2004
2005 /*
2006 * Standard function to be called on quota_on
2007 */
2008 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2009 char *name, int remount)
2010 {
2011 int err;
2012 struct path path;
2013 struct inode *inode;
2014 struct reiserfs_transaction_handle th;
2015
2016 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2017 return -EINVAL;
2018 /* No more checks needed? Path and format_id are bogus anyway... */
2019 if (remount)
2020 return vfs_quota_on(sb, type, format_id, name, 1);
2021 err = kern_path(name, LOOKUP_FOLLOW, &path);
2022 if (err)
2023 return err;
2024 /* Quotafile not on the same filesystem? */
2025 if (path.mnt->mnt_sb != sb) {
2026 err = -EXDEV;
2027 goto out;
2028 }
2029 inode = path.dentry->d_inode;
2030 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2031 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2032 err = reiserfs_unpack(inode, NULL);
2033 if (err) {
2034 reiserfs_warning(sb,
2035 "reiserfs: Unpacking tail of quota file failed"
2036 " (%d). Cannot turn on quotas.", err);
2037 err = -EINVAL;
2038 goto out;
2039 }
2040 mark_inode_dirty(inode);
2041 }
2042 /* Journaling quota? */
2043 if (REISERFS_SB(sb)->s_qf_names[type]) {
2044 /* Quotafile not of fs root? */
2045 if (path.dentry->d_parent != sb->s_root)
2046 reiserfs_warning(sb,
2047 "reiserfs: Quota file not on filesystem root. "
2048 "Journalled quota will not work.");
2049 }
2050
2051 /*
2052 * When we journal data on quota file, we have to flush journal to see
2053 * all updates to the file when we bypass pagecache...
2054 */
2055 if (reiserfs_file_data_log(inode)) {
2056 /* Just start temporary transaction and finish it */
2057 err = journal_begin(&th, sb, 1);
2058 if (err)
2059 goto out;
2060 err = journal_end_sync(&th, sb, 1);
2061 if (err)
2062 goto out;
2063 }
2064 err = vfs_quota_on_path(sb, type, format_id, &path);
2065 out:
2066 path_put(&path);
2067 return err;
2068 }
2069
2070 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2071 * acquiring the locks... As quota files are never truncated and quota code
2072 * itself serializes the operations (and noone else should touch the files)
2073 * we don't have to be afraid of races */
2074 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2075 size_t len, loff_t off)
2076 {
2077 struct inode *inode = sb_dqopt(sb)->files[type];
2078 unsigned long blk = off >> sb->s_blocksize_bits;
2079 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2080 size_t toread;
2081 struct buffer_head tmp_bh, *bh;
2082 loff_t i_size = i_size_read(inode);
2083
2084 if (off > i_size)
2085 return 0;
2086 if (off + len > i_size)
2087 len = i_size - off;
2088 toread = len;
2089 while (toread > 0) {
2090 tocopy =
2091 sb->s_blocksize - offset <
2092 toread ? sb->s_blocksize - offset : toread;
2093 tmp_bh.b_state = 0;
2094 /* Quota files are without tails so we can safely use this function */
2095 reiserfs_write_lock(sb);
2096 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2097 reiserfs_write_unlock(sb);
2098 if (err)
2099 return err;
2100 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2101 memset(data, 0, tocopy);
2102 else {
2103 bh = sb_bread(sb, tmp_bh.b_blocknr);
2104 if (!bh)
2105 return -EIO;
2106 memcpy(data, bh->b_data + offset, tocopy);
2107 brelse(bh);
2108 }
2109 offset = 0;
2110 toread -= tocopy;
2111 data += tocopy;
2112 blk++;
2113 }
2114 return len;
2115 }
2116
2117 /* Write to quotafile (we know the transaction is already started and has
2118 * enough credits) */
2119 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2120 const char *data, size_t len, loff_t off)
2121 {
2122 struct inode *inode = sb_dqopt(sb)->files[type];
2123 unsigned long blk = off >> sb->s_blocksize_bits;
2124 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2125 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2126 size_t towrite = len;
2127 struct buffer_head tmp_bh, *bh;
2128
2129 if (!current->journal_info) {
2130 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2131 " cancelled because transaction is not started.\n",
2132 (unsigned long long)off, (unsigned long long)len);
2133 return -EIO;
2134 }
2135 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2136 while (towrite > 0) {
2137 tocopy = sb->s_blocksize - offset < towrite ?
2138 sb->s_blocksize - offset : towrite;
2139 tmp_bh.b_state = 0;
2140 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2141 if (err)
2142 goto out;
2143 if (offset || tocopy != sb->s_blocksize)
2144 bh = sb_bread(sb, tmp_bh.b_blocknr);
2145 else
2146 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2147 if (!bh) {
2148 err = -EIO;
2149 goto out;
2150 }
2151 lock_buffer(bh);
2152 memcpy(bh->b_data + offset, data, tocopy);
2153 flush_dcache_page(bh->b_page);
2154 set_buffer_uptodate(bh);
2155 unlock_buffer(bh);
2156 reiserfs_prepare_for_journal(sb, bh, 1);
2157 journal_mark_dirty(current->journal_info, sb, bh);
2158 if (!journal_quota)
2159 reiserfs_add_ordered_list(inode, bh);
2160 brelse(bh);
2161 offset = 0;
2162 towrite -= tocopy;
2163 data += tocopy;
2164 blk++;
2165 }
2166 out:
2167 if (len == towrite) {
2168 mutex_unlock(&inode->i_mutex);
2169 return err;
2170 }
2171 if (inode->i_size < off + len - towrite)
2172 i_size_write(inode, off + len - towrite);
2173 inode->i_version++;
2174 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2175 mark_inode_dirty(inode);
2176 mutex_unlock(&inode->i_mutex);
2177 return len - towrite;
2178 }
2179
2180 #endif
2181
2182 static int get_super_block(struct file_system_type *fs_type,
2183 int flags, const char *dev_name,
2184 void *data, struct vfsmount *mnt)
2185 {
2186 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2187 mnt);
2188 }
2189
2190 static int __init init_reiserfs_fs(void)
2191 {
2192 int ret;
2193
2194 if ((ret = init_inodecache())) {
2195 return ret;
2196 }
2197
2198 if ((ret = reiserfs_xattr_register_handlers()))
2199 goto failed_reiserfs_xattr_register_handlers;
2200
2201 reiserfs_proc_info_global_init();
2202 reiserfs_proc_register_global("version",
2203 reiserfs_global_version_in_proc);
2204
2205 ret = register_filesystem(&reiserfs_fs_type);
2206
2207 if (ret == 0) {
2208 return 0;
2209 }
2210
2211 reiserfs_xattr_unregister_handlers();
2212
2213 failed_reiserfs_xattr_register_handlers:
2214 reiserfs_proc_unregister_global("version");
2215 reiserfs_proc_info_global_done();
2216 destroy_inodecache();
2217
2218 return ret;
2219 }
2220
2221 static void __exit exit_reiserfs_fs(void)
2222 {
2223 reiserfs_xattr_unregister_handlers();
2224 reiserfs_proc_unregister_global("version");
2225 reiserfs_proc_info_global_done();
2226 unregister_filesystem(&reiserfs_fs_type);
2227 destroy_inodecache();
2228 }
2229
2230 struct file_system_type reiserfs_fs_type = {
2231 .owner = THIS_MODULE,
2232 .name = "reiserfs",
2233 .get_sb = get_super_block,
2234 .kill_sb = reiserfs_kill_sb,
2235 .fs_flags = FS_REQUIRES_DEV,
2236 };
2237
2238 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2239 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2240 MODULE_LICENSE("GPL");
2241
2242 module_init(init_reiserfs_fs);
2243 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree