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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / fs / reiserfs / super.c
blobedfd74f9f7e4db8d84c63135b331591f7be5d661
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/vfs.h>
26 #include <linux/mnt_namespace.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/quotaops.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 void reiserfs_write_super_lockfs(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 }
105
106 static void reiserfs_unlockfs(struct super_block *s)
107 {
108 reiserfs_allow_writes(s);
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114 file it points to. It can either happen if unlink is completed but
115 "save unlink" removal, or if file has both unlink and truncate
116 pending and as unlink completes first (because key of "save link"
117 protecting unlink is bigger that a key lf "save link" which
118 protects truncate), so there left no items to make truncate
119 completion on */
120 static int remove_save_link_only(struct super_block *s,
121 struct reiserfs_key *key, int oid_free)
122 {
123 struct reiserfs_transaction_handle th;
124 int err;
125
126 /* we are going to do one balancing */
127 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128 if (err)
129 return err;
130
131 reiserfs_delete_solid_item(&th, NULL, key);
132 if (oid_free)
133 /* removals are protected by direct items */
134 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146 INITIALIZE_PATH(path);
147 struct cpu_key max_cpu_key, obj_key;
148 struct reiserfs_key save_link_key;
149 int retval = 0;
150 struct item_head *ih;
151 struct buffer_head *bh;
152 int item_pos;
153 char *item;
154 int done;
155 struct inode *inode;
156 int truncate;
157 #ifdef CONFIG_QUOTA
158 int i;
159 int ms_active_set;
160 #endif
161
162 /* compose key to look for "save" links */
163 max_cpu_key.version = KEY_FORMAT_3_5;
164 max_cpu_key.on_disk_key.k_dir_id = ~0U;
165 max_cpu_key.on_disk_key.k_objectid = ~0U;
166 set_cpu_key_k_offset(&max_cpu_key, ~0U);
167 max_cpu_key.key_length = 3;
168
169 #ifdef CONFIG_QUOTA
170 /* Needed for iput() to work correctly and not trash data */
171 if (s->s_flags & MS_ACTIVE) {
172 ms_active_set = 0;
173 } else {
174 ms_active_set = 1;
175 s->s_flags |= MS_ACTIVE;
176 }
177 /* Turn on quotas so that they are updated correctly */
178 for (i = 0; i < MAXQUOTAS; i++) {
179 if (REISERFS_SB(s)->s_qf_names[i]) {
180 int ret = reiserfs_quota_on_mount(s, i);
181 if (ret < 0)
182 reiserfs_warning(s,
183 "reiserfs: cannot turn on journalled quota: error %d",
184 ret);
185 }
186 }
187 #endif
188
189 done = 0;
190 REISERFS_SB(s)->s_is_unlinked_ok = 1;
191 while (!retval) {
192 retval = search_item(s, &max_cpu_key, &path);
193 if (retval != ITEM_NOT_FOUND) {
194 reiserfs_warning(s,
195 "vs-2140: finish_unfinished: search_by_key returned %d",
196 retval);
197 break;
198 }
199
200 bh = get_last_bh(&path);
201 item_pos = get_item_pos(&path);
202 if (item_pos != B_NR_ITEMS(bh)) {
203 reiserfs_warning(s,
204 "vs-2060: finish_unfinished: wrong position found");
205 break;
206 }
207 item_pos--;
208 ih = B_N_PITEM_HEAD(bh, item_pos);
209
210 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
211 /* there are no "save" links anymore */
212 break;
213
214 save_link_key = ih->ih_key;
215 if (is_indirect_le_ih(ih))
216 truncate = 1;
217 else
218 truncate = 0;
219
220 /* reiserfs_iget needs k_dirid and k_objectid only */
221 item = B_I_PITEM(bh, ih);
222 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
223 obj_key.on_disk_key.k_objectid =
224 le32_to_cpu(ih->ih_key.k_objectid);
225 obj_key.on_disk_key.k_offset = 0;
226 obj_key.on_disk_key.k_type = 0;
227
228 pathrelse(&path);
229
230 inode = reiserfs_iget(s, &obj_key);
231 if (!inode) {
232 /* the unlink almost completed, it just did not manage to remove
233 "save" link and release objectid */
234 reiserfs_warning(s,
235 "vs-2180: finish_unfinished: iget failed for %K",
236 &obj_key);
237 retval = remove_save_link_only(s, &save_link_key, 1);
238 continue;
239 }
240
241 if (!truncate && inode->i_nlink) {
242 /* file is not unlinked */
243 reiserfs_warning(s,
244 "vs-2185: finish_unfinished: file %K is not unlinked",
245 &obj_key);
246 retval = remove_save_link_only(s, &save_link_key, 0);
247 continue;
248 }
249 DQUOT_INIT(inode);
250
251 if (truncate && S_ISDIR(inode->i_mode)) {
252 /* We got a truncate request for a dir which is impossible.
253 The only imaginable way is to execute unfinished truncate request
254 then boot into old kernel, remove the file and create dir with
255 the same key. */
256 reiserfs_warning(s,
257 "green-2101: impossible truncate on a directory %k. Please report",
258 INODE_PKEY(inode));
259 retval = remove_save_link_only(s, &save_link_key, 0);
260 truncate = 0;
261 iput(inode);
262 continue;
263 }
264
265 if (truncate) {
266 REISERFS_I(inode)->i_flags |=
267 i_link_saved_truncate_mask;
268 /* not completed truncate found. New size was committed together
269 with "save" link */
270 reiserfs_info(s, "Truncating %k to %Ld ..",
271 INODE_PKEY(inode), inode->i_size);
272 reiserfs_truncate_file(inode,
273 0
274 /*don't update modification time */
275 );
276 retval = remove_save_link(inode, truncate);
277 } else {
278 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
279 /* not completed unlink (rmdir) found */
280 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
281 /* removal gets completed in iput */
282 retval = 0;
283 }
284
285 iput(inode);
286 printk("done\n");
287 done++;
288 }
289 REISERFS_SB(s)->s_is_unlinked_ok = 0;
290
291 #ifdef CONFIG_QUOTA
292 /* Turn quotas off */
293 for (i = 0; i < MAXQUOTAS; i++) {
294 if (sb_dqopt(s)->files[i])
295 vfs_quota_off_mount(s, i);
296 }
297 if (ms_active_set)
298 /* Restore the flag back */
299 s->s_flags &= ~MS_ACTIVE;
300 #endif
301 pathrelse(&path);
302 if (done)
303 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
304 "Completed\n", done);
305 return retval;
306 }
307
308 /* to protect file being unlinked from getting lost we "safe" link files
309 being unlinked. This link will be deleted in the same transaction with last
310 item of file. mounting the filesytem we scan all these links and remove
311 files which almost got lost */
312 void add_save_link(struct reiserfs_transaction_handle *th,
313 struct inode *inode, int truncate)
314 {
315 INITIALIZE_PATH(path);
316 int retval;
317 struct cpu_key key;
318 struct item_head ih;
319 __le32 link;
320
321 BUG_ON(!th->t_trans_id);
322
323 /* file can only get one "save link" of each kind */
324 RFALSE(truncate &&
325 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
326 "saved link already exists for truncated inode %lx",
327 (long)inode->i_ino);
328 RFALSE(!truncate &&
329 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
330 "saved link already exists for unlinked inode %lx",
331 (long)inode->i_ino);
332
333 /* setup key of "save" link */
334 key.version = KEY_FORMAT_3_5;
335 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
336 key.on_disk_key.k_objectid = inode->i_ino;
337 if (!truncate) {
338 /* unlink, rmdir, rename */
339 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
340 set_cpu_key_k_type(&key, TYPE_DIRECT);
341
342 /* item head of "safe" link */
343 make_le_item_head(&ih, &key, key.version,
344 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
345 4 /*length */ , 0xffff /*free space */ );
346 } else {
347 /* truncate */
348 if (S_ISDIR(inode->i_mode))
349 reiserfs_warning(inode->i_sb,
350 "green-2102: Adding a truncate savelink for a directory %k! Please report",
351 INODE_PKEY(inode));
352 set_cpu_key_k_offset(&key, 1);
353 set_cpu_key_k_type(&key, TYPE_INDIRECT);
354
355 /* item head of "safe" link */
356 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
357 4 /*length */ , 0 /*free space */ );
358 }
359 key.key_length = 3;
360
361 /* look for its place in the tree */
362 retval = search_item(inode->i_sb, &key, &path);
363 if (retval != ITEM_NOT_FOUND) {
364 if (retval != -ENOSPC)
365 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
366 "search_by_key (%K) returned %d", &key,
367 retval);
368 pathrelse(&path);
369 return;
370 }
371
372 /* body of "save" link */
373 link = INODE_PKEY(inode)->k_dir_id;
374
375 /* put "save" link inot tree, don't charge quota to anyone */
376 retval =
377 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
378 if (retval) {
379 if (retval != -ENOSPC)
380 reiserfs_warning(inode->i_sb,
381 "vs-2120: add_save_link: insert_item returned %d",
382 retval);
383 } else {
384 if (truncate)
385 REISERFS_I(inode)->i_flags |=
386 i_link_saved_truncate_mask;
387 else
388 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
389 }
390 }
391
392 /* this opens transaction unlike add_save_link */
393 int remove_save_link(struct inode *inode, int truncate)
394 {
395 struct reiserfs_transaction_handle th;
396 struct reiserfs_key key;
397 int err;
398
399 /* we are going to do one balancing only */
400 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
401 if (err)
402 return err;
403
404 /* setup key of "save" link */
405 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
406 key.k_objectid = INODE_PKEY(inode)->k_objectid;
407 if (!truncate) {
408 /* unlink, rmdir, rename */
409 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
410 1 + inode->i_sb->s_blocksize);
411 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
412 } else {
413 /* truncate */
414 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
415 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
416 }
417
418 if ((truncate &&
419 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
420 (!truncate &&
421 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
422 /* don't take quota bytes from anywhere */
423 reiserfs_delete_solid_item(&th, NULL, &key);
424 if (!truncate) {
425 reiserfs_release_objectid(&th, inode->i_ino);
426 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
427 } else
428 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
429
430 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
431 }
432
433 static void reiserfs_kill_sb(struct super_block *s)
434 {
435 if (REISERFS_SB(s)) {
436 #ifdef CONFIG_REISERFS_FS_XATTR
437 if (REISERFS_SB(s)->xattr_root) {
438 d_invalidate(REISERFS_SB(s)->xattr_root);
439 dput(REISERFS_SB(s)->xattr_root);
440 REISERFS_SB(s)->xattr_root = NULL;
441 }
442 #endif
443 if (REISERFS_SB(s)->priv_root) {
444 d_invalidate(REISERFS_SB(s)->priv_root);
445 dput(REISERFS_SB(s)->priv_root);
446 REISERFS_SB(s)->priv_root = NULL;
447 }
448 }
449
450 kill_block_super(s);
451 }
452
453 static void reiserfs_put_super(struct super_block *s)
454 {
455 struct reiserfs_transaction_handle th;
456 th.t_trans_id = 0;
457
458 /* change file system state to current state if it was mounted with read-write permissions */
459 if (!(s->s_flags & MS_RDONLY)) {
460 if (!journal_begin(&th, s, 10)) {
461 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
462 1);
463 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
464 REISERFS_SB(s)->s_mount_state);
465 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
466 }
467 }
468
469 /* note, journal_release checks for readonly mount, and can decide not
470 ** to do a journal_end
471 */
472 journal_release(&th, s);
473
474 reiserfs_free_bitmap_cache(s);
475
476 brelse(SB_BUFFER_WITH_SB(s));
477
478 print_statistics(s);
479
480 if (REISERFS_SB(s)->reserved_blocks != 0) {
481 reiserfs_warning(s,
482 "green-2005: reiserfs_put_super: reserved blocks left %d",
483 REISERFS_SB(s)->reserved_blocks);
484 }
485
486 reiserfs_proc_info_done(s);
487
488 kfree(s->s_fs_info);
489 s->s_fs_info = NULL;
490
491 return;
492 }
493
494 static struct kmem_cache *reiserfs_inode_cachep;
495
496 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
497 {
498 struct reiserfs_inode_info *ei;
499 ei = (struct reiserfs_inode_info *)
500 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
501 if (!ei)
502 return NULL;
503 return &ei->vfs_inode;
504 }
505
506 static void reiserfs_destroy_inode(struct inode *inode)
507 {
508 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
509 }
510
511 static void init_once(struct kmem_cache * cachep, void *foo)
512 {
513 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
514
515 INIT_LIST_HEAD(&ei->i_prealloc_list);
516 inode_init_once(&ei->vfs_inode);
517 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
518 ei->i_acl_access = NULL;
519 ei->i_acl_default = NULL;
520 #endif
521 }
522
523 static int init_inodecache(void)
524 {
525 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
526 sizeof(struct
527 reiserfs_inode_info),
528 0, (SLAB_RECLAIM_ACCOUNT|
529 SLAB_MEM_SPREAD),
530 init_once);
531 if (reiserfs_inode_cachep == NULL)
532 return -ENOMEM;
533 return 0;
534 }
535
536 static void destroy_inodecache(void)
537 {
538 kmem_cache_destroy(reiserfs_inode_cachep);
539 }
540
541 /* we don't mark inodes dirty, we just log them */
542 static void reiserfs_dirty_inode(struct inode *inode)
543 {
544 struct reiserfs_transaction_handle th;
545
546 int err = 0;
547 if (inode->i_sb->s_flags & MS_RDONLY) {
548 reiserfs_warning(inode->i_sb,
549 "clm-6006: writing inode %lu on readonly FS",
550 inode->i_ino);
551 return;
552 }
553 reiserfs_write_lock(inode->i_sb);
554
555 /* this is really only used for atime updates, so they don't have
556 ** to be included in O_SYNC or fsync
557 */
558 err = journal_begin(&th, inode->i_sb, 1);
559 if (err) {
560 reiserfs_write_unlock(inode->i_sb);
561 return;
562 }
563 reiserfs_update_sd(&th, inode);
564 journal_end(&th, inode->i_sb, 1);
565 reiserfs_write_unlock(inode->i_sb);
566 }
567
568 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
569 static void reiserfs_clear_inode(struct inode *inode)
570 {
571 struct posix_acl *acl;
572
573 acl = REISERFS_I(inode)->i_acl_access;
574 if (acl && !IS_ERR(acl))
575 posix_acl_release(acl);
576 REISERFS_I(inode)->i_acl_access = NULL;
577
578 acl = REISERFS_I(inode)->i_acl_default;
579 if (acl && !IS_ERR(acl))
580 posix_acl_release(acl);
581 REISERFS_I(inode)->i_acl_default = NULL;
582 }
583 #else
584 #define reiserfs_clear_inode NULL
585 #endif
586
587 #ifdef CONFIG_QUOTA
588 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
589 size_t, loff_t);
590 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
591 loff_t);
592 #endif
593
594 static const struct super_operations reiserfs_sops = {
595 .alloc_inode = reiserfs_alloc_inode,
596 .destroy_inode = reiserfs_destroy_inode,
597 .write_inode = reiserfs_write_inode,
598 .dirty_inode = reiserfs_dirty_inode,
599 .delete_inode = reiserfs_delete_inode,
600 .clear_inode = reiserfs_clear_inode,
601 .put_super = reiserfs_put_super,
602 .write_super = reiserfs_write_super,
603 .sync_fs = reiserfs_sync_fs,
604 .write_super_lockfs = reiserfs_write_super_lockfs,
605 .unlockfs = reiserfs_unlockfs,
606 .statfs = reiserfs_statfs,
607 .remount_fs = reiserfs_remount,
608 #ifdef CONFIG_QUOTA
609 .quota_read = reiserfs_quota_read,
610 .quota_write = reiserfs_quota_write,
611 #endif
612 };
613
614 #ifdef CONFIG_QUOTA
615 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
616
617 static int reiserfs_dquot_initialize(struct inode *, int);
618 static int reiserfs_dquot_drop(struct inode *);
619 static int reiserfs_write_dquot(struct dquot *);
620 static int reiserfs_acquire_dquot(struct dquot *);
621 static int reiserfs_release_dquot(struct dquot *);
622 static int reiserfs_mark_dquot_dirty(struct dquot *);
623 static int reiserfs_write_info(struct super_block *, int);
624 static int reiserfs_quota_on(struct super_block *, int, int, char *);
625
626 static struct dquot_operations reiserfs_quota_operations = {
627 .initialize = reiserfs_dquot_initialize,
628 .drop = reiserfs_dquot_drop,
629 .alloc_space = dquot_alloc_space,
630 .alloc_inode = dquot_alloc_inode,
631 .free_space = dquot_free_space,
632 .free_inode = dquot_free_inode,
633 .transfer = dquot_transfer,
634 .write_dquot = reiserfs_write_dquot,
635 .acquire_dquot = reiserfs_acquire_dquot,
636 .release_dquot = reiserfs_release_dquot,
637 .mark_dirty = reiserfs_mark_dquot_dirty,
638 .write_info = reiserfs_write_info,
639 };
640
641 static struct quotactl_ops reiserfs_qctl_operations = {
642 .quota_on = reiserfs_quota_on,
643 .quota_off = vfs_quota_off,
644 .quota_sync = vfs_quota_sync,
645 .get_info = vfs_get_dqinfo,
646 .set_info = vfs_set_dqinfo,
647 .get_dqblk = vfs_get_dqblk,
648 .set_dqblk = vfs_set_dqblk,
649 };
650 #endif
651
652 static struct export_operations reiserfs_export_ops = {
653 .encode_fh = reiserfs_encode_fh,
654 .decode_fh = reiserfs_decode_fh,
655 .get_parent = reiserfs_get_parent,
656 .get_dentry = reiserfs_get_dentry,
657 };
658
659 /* this struct is used in reiserfs_getopt () for containing the value for those
660 mount options that have values rather than being toggles. */
661 typedef struct {
662 char *value;
663 int setmask; /* bitmask which is to set on mount_options bitmask when this
664 value is found, 0 is no bits are to be changed. */
665 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
666 value is found, 0 is no bits are to be changed. This is
667 applied BEFORE setmask */
668 } arg_desc_t;
669
670 /* Set this bit in arg_required to allow empty arguments */
671 #define REISERFS_OPT_ALLOWEMPTY 31
672
673 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
674 mount options */
675 typedef struct {
676 char *option_name;
677 int arg_required; /* 0 if argument is not required, not 0 otherwise */
678 const arg_desc_t *values; /* list of values accepted by an option */
679 int setmask; /* bitmask which is to set on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. */
681 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
682 value is found, 0 is no bits are to be changed. This is
683 applied BEFORE setmask */
684 } opt_desc_t;
685
686 /* possible values for -o data= */
687 static const arg_desc_t logging_mode[] = {
688 {"ordered", 1 << REISERFS_DATA_ORDERED,
689 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
690 {"journal", 1 << REISERFS_DATA_LOG,
691 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
692 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
693 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
694 {.value = NULL}
695 };
696
697 /* possible values for -o barrier= */
698 static const arg_desc_t barrier_mode[] = {
699 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
700 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
701 {.value = NULL}
702 };
703
704 /* possible values for "-o block-allocator=" and bits which are to be set in
705 s_mount_opt of reiserfs specific part of in-core super block */
706 static const arg_desc_t balloc[] = {
707 {"noborder", 1 << REISERFS_NO_BORDER, 0},
708 {"border", 0, 1 << REISERFS_NO_BORDER},
709 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
710 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
711 {"test4", 1 << REISERFS_TEST4, 0},
712 {"notest4", 0, 1 << REISERFS_TEST4},
713 {NULL, 0, 0}
714 };
715
716 static const arg_desc_t tails[] = {
717 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
718 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
719 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
720 {NULL, 0, 0}
721 };
722
723 static const arg_desc_t error_actions[] = {
724 {"panic", 1 << REISERFS_ERROR_PANIC,
725 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
726 {"ro-remount", 1 << REISERFS_ERROR_RO,
727 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
728 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
729 {"continue", 1 << REISERFS_ERROR_CONTINUE,
730 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
731 #endif
732 {NULL, 0, 0},
733 };
734
735 /* proceed only one option from a list *cur - string containing of mount options
736 opts - array of options which are accepted
737 opt_arg - if option is found and requires an argument and if it is specifed
738 in the input - pointer to the argument is stored here
739 bit_flags - if option requires to set a certain bit - it is set here
740 return -1 if unknown option is found, opt->arg_required otherwise */
741 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
742 char **opt_arg, unsigned long *bit_flags)
743 {
744 char *p;
745 /* foo=bar,
746 ^ ^ ^
747 | | +-- option_end
748 | +-- arg_start
749 +-- option_start
750 */
751 const opt_desc_t *opt;
752 const arg_desc_t *arg;
753
754 p = *cur;
755
756 /* assume argument cannot contain commas */
757 *cur = strchr(p, ',');
758 if (*cur) {
759 *(*cur) = '\0';
760 (*cur)++;
761 }
762
763 if (!strncmp(p, "alloc=", 6)) {
764 /* Ugly special case, probably we should redo options parser so that
765 it can understand several arguments for some options, also so that
766 it can fill several bitfields with option values. */
767 if (reiserfs_parse_alloc_options(s, p + 6)) {
768 return -1;
769 } else {
770 return 0;
771 }
772 }
773
774 /* for every option in the list */
775 for (opt = opts; opt->option_name; opt++) {
776 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
777 if (bit_flags) {
778 if (opt->clrmask ==
779 (1 << REISERFS_UNSUPPORTED_OPT))
780 reiserfs_warning(s, "%s not supported.",
781 p);
782 else
783 *bit_flags &= ~opt->clrmask;
784 if (opt->setmask ==
785 (1 << REISERFS_UNSUPPORTED_OPT))
786 reiserfs_warning(s, "%s not supported.",
787 p);
788 else
789 *bit_flags |= opt->setmask;
790 }
791 break;
792 }
793 }
794 if (!opt->option_name) {
795 reiserfs_warning(s, "unknown mount option \"%s\"", p);
796 return -1;
797 }
798
799 p += strlen(opt->option_name);
800 switch (*p) {
801 case '=':
802 if (!opt->arg_required) {
803 reiserfs_warning(s,
804 "the option \"%s\" does not require an argument",
805 opt->option_name);
806 return -1;
807 }
808 break;
809
810 case 0:
811 if (opt->arg_required) {
812 reiserfs_warning(s,
813 "the option \"%s\" requires an argument",
814 opt->option_name);
815 return -1;
816 }
817 break;
818 default:
819 reiserfs_warning(s, "head of option \"%s\" is only correct",
820 opt->option_name);
821 return -1;
822 }
823
824 /* move to the argument, or to next option if argument is not required */
825 p++;
826
827 if (opt->arg_required
828 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
829 && !strlen(p)) {
830 /* this catches "option=," if not allowed */
831 reiserfs_warning(s, "empty argument for \"%s\"",
832 opt->option_name);
833 return -1;
834 }
835
836 if (!opt->values) {
837 /* *=NULLopt_arg contains pointer to argument */
838 *opt_arg = p;
839 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840 }
841
842 /* values possible for this option are listed in opt->values */
843 for (arg = opt->values; arg->value; arg++) {
844 if (!strcmp(p, arg->value)) {
845 if (bit_flags) {
846 *bit_flags &= ~arg->clrmask;
847 *bit_flags |= arg->setmask;
848 }
849 return opt->arg_required;
850 }
851 }
852
853 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
854 opt->option_name);
855 return -1;
856 }
857
858 /* returns 0 if something is wrong in option string, 1 - otherwise */
859 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
860 unsigned long *mount_options,
861 /* after the parsing phase, contains the
862 collection of bitflags defining what
863 mount options were selected. */
864 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
865 char **jdev_name,
866 unsigned int *commit_max_age)
867 {
868 int c;
869 char *arg = NULL;
870 char *pos;
871 opt_desc_t opts[] = {
872 /* Compatibility stuff, so that -o notail for old setups still work */
873 {"tails",.arg_required = 't',.values = tails},
874 {"notail",.clrmask =
875 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
876 {"conv",.setmask = 1 << REISERFS_CONVERT},
877 {"attrs",.setmask = 1 << REISERFS_ATTRS},
878 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
879 #ifdef CONFIG_REISERFS_FS_XATTR
880 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
881 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
882 #else
883 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
884 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
885 #endif
886 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
887 {"acl",.setmask = 1 << REISERFS_POSIXACL},
888 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
889 #else
890 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
892 #endif
893 {.option_name = "nolog"},
894 {"replayonly",.setmask = 1 << REPLAYONLY},
895 {"block-allocator",.arg_required = 'a',.values = balloc},
896 {"data",.arg_required = 'd',.values = logging_mode},
897 {"barrier",.arg_required = 'b',.values = barrier_mode},
898 {"resize",.arg_required = 'r',.values = NULL},
899 {"jdev",.arg_required = 'j',.values = NULL},
900 {"nolargeio",.arg_required = 'w',.values = NULL},
901 {"commit",.arg_required = 'c',.values = NULL},
902 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
903 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
904 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
905 {"errors",.arg_required = 'e',.values = error_actions},
906 {"usrjquota",.arg_required =
907 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
908 {"grpjquota",.arg_required =
909 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
910 {"jqfmt",.arg_required = 'f',.values = NULL},
911 {.option_name = NULL}
912 };
913
914 *blocks = 0;
915 if (!options || !*options)
916 /* use default configuration: create tails, journaling on, no
917 conversion to newest format */
918 return 1;
919
920 for (pos = options; pos;) {
921 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
922 if (c == -1)
923 /* wrong option is given */
924 return 0;
925
926 if (c == 'r') {
927 char *p;
928
929 p = NULL;
930 /* "resize=NNN" or "resize=auto" */
931
932 if (!strcmp(arg, "auto")) {
933 /* From JFS code, to auto-get the size. */
934 *blocks =
935 s->s_bdev->bd_inode->i_size >> s->
936 s_blocksize_bits;
937 } else {
938 *blocks = simple_strtoul(arg, &p, 0);
939 if (*p != '\0') {
940 /* NNN does not look like a number */
941 reiserfs_warning(s,
942 "reiserfs_parse_options: bad value %s",
943 arg);
944 return 0;
945 }
946 }
947 }
948
949 if (c == 'c') {
950 char *p = NULL;
951 unsigned long val = simple_strtoul(arg, &p, 0);
952 /* commit=NNN (time in seconds) */
953 if (*p != '\0' || val >= (unsigned int)-1) {
954 reiserfs_warning(s,
955 "reiserfs_parse_options: bad value %s",
956 arg);
957 return 0;
958 }
959 *commit_max_age = (unsigned int)val;
960 }
961
962 if (c == 'w') {
963 reiserfs_warning(s, "reiserfs: nolargeio option is no longer supported");
964 return 0;
965 }
966
967 if (c == 'j') {
968 if (arg && *arg && jdev_name) {
969 if (*jdev_name) { //Hm, already assigned?
970 reiserfs_warning(s,
971 "reiserfs_parse_options: journal device was already specified to be %s",
972 *jdev_name);
973 return 0;
974 }
975 *jdev_name = arg;
976 }
977 }
978 #ifdef CONFIG_QUOTA
979 if (c == 'u' || c == 'g') {
980 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
981
982 if (sb_any_quota_enabled(s)) {
983 reiserfs_warning(s,
984 "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
985 return 0;
986 }
987 if (*arg) { /* Some filename specified? */
988 if (REISERFS_SB(s)->s_qf_names[qtype]
989 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
990 arg)) {
991 reiserfs_warning(s,
992 "reiserfs_parse_options: %s quota file already specified.",
993 QTYPE2NAME(qtype));
994 return 0;
995 }
996 if (strchr(arg, '/')) {
997 reiserfs_warning(s,
998 "reiserfs_parse_options: quotafile must be on filesystem root.");
999 return 0;
1000 }
1001 REISERFS_SB(s)->s_qf_names[qtype] =
1002 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1003 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1004 reiserfs_warning(s,
1005 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1006 return 0;
1007 }
1008 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1009 *mount_options |= 1 << REISERFS_QUOTA;
1010 } else {
1011 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1012 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1013 }
1014 }
1015 if (c == 'f') {
1016 if (!strcmp(arg, "vfsold"))
1017 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1018 else if (!strcmp(arg, "vfsv0"))
1019 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1020 else {
1021 reiserfs_warning(s,
1022 "reiserfs_parse_options: unknown quota format specified.");
1023 return 0;
1024 }
1025 }
1026 #else
1027 if (c == 'u' || c == 'g' || c == 'f') {
1028 reiserfs_warning(s,
1029 "reiserfs_parse_options: journalled quota options not supported.");
1030 return 0;
1031 }
1032 #endif
1033 }
1034
1035 #ifdef CONFIG_QUOTA
1036 if (!REISERFS_SB(s)->s_jquota_fmt
1037 && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1038 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1039 reiserfs_warning(s,
1040 "reiserfs_parse_options: journalled quota format not specified.");
1041 return 0;
1042 }
1043 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1044 if (!(*mount_options & (1 << REISERFS_QUOTA))
1045 && sb_any_quota_enabled(s)) {
1046 reiserfs_warning(s,
1047 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1048 return 0;
1049 }
1050 #endif
1051
1052 return 1;
1053 }
1054
1055 static void switch_data_mode(struct super_block *s, unsigned long mode)
1056 {
1057 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1058 (1 << REISERFS_DATA_ORDERED) |
1059 (1 << REISERFS_DATA_WRITEBACK));
1060 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1061 }
1062
1063 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1064 {
1065 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1066 if (!reiserfs_data_log(s)) {
1067 switch_data_mode(s, REISERFS_DATA_LOG);
1068 reiserfs_info(s, "switching to journaled data mode\n");
1069 }
1070 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1071 if (!reiserfs_data_ordered(s)) {
1072 switch_data_mode(s, REISERFS_DATA_ORDERED);
1073 reiserfs_info(s, "switching to ordered data mode\n");
1074 }
1075 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1076 if (!reiserfs_data_writeback(s)) {
1077 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1078 reiserfs_info(s, "switching to writeback data mode\n");
1079 }
1080 }
1081 }
1082
1083 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1084 {
1085 int flush = (1 << REISERFS_BARRIER_FLUSH);
1086 int none = (1 << REISERFS_BARRIER_NONE);
1087 int all_barrier = flush | none;
1088
1089 if (bits & all_barrier) {
1090 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1091 if (bits & flush) {
1092 REISERFS_SB(s)->s_mount_opt |= flush;
1093 printk("reiserfs: enabling write barrier flush mode\n");
1094 } else if (bits & none) {
1095 REISERFS_SB(s)->s_mount_opt |= none;
1096 printk("reiserfs: write barriers turned off\n");
1097 }
1098 }
1099 }
1100
1101 static void handle_attrs(struct super_block *s)
1102 {
1103 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1104
1105 if (reiserfs_attrs(s)) {
1106 if (old_format_only(s)) {
1107 reiserfs_warning(s,
1108 "reiserfs: cannot support attributes on 3.5.x disk format");
1109 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1110 return;
1111 }
1112 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1113 reiserfs_warning(s,
1114 "reiserfs: cannot support attributes until flag is set in super-block");
1115 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1116 }
1117 }
1118 }
1119
1120 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1121 {
1122 struct reiserfs_super_block *rs;
1123 struct reiserfs_transaction_handle th;
1124 unsigned long blocks;
1125 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1126 unsigned long safe_mask = 0;
1127 unsigned int commit_max_age = (unsigned int)-1;
1128 struct reiserfs_journal *journal = SB_JOURNAL(s);
1129 int err;
1130 #ifdef CONFIG_QUOTA
1131 int i;
1132 #endif
1133
1134 rs = SB_DISK_SUPER_BLOCK(s);
1135
1136 if (!reiserfs_parse_options
1137 (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1138 #ifdef CONFIG_QUOTA
1139 for (i = 0; i < MAXQUOTAS; i++) {
1140 kfree(REISERFS_SB(s)->s_qf_names[i]);
1141 REISERFS_SB(s)->s_qf_names[i] = NULL;
1142 }
1143 #endif
1144 return -EINVAL;
1145 }
1146
1147 handle_attrs(s);
1148
1149 /* Add options that are safe here */
1150 safe_mask |= 1 << REISERFS_SMALLTAIL;
1151 safe_mask |= 1 << REISERFS_LARGETAIL;
1152 safe_mask |= 1 << REISERFS_NO_BORDER;
1153 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1154 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1155 safe_mask |= 1 << REISERFS_TEST4;
1156 safe_mask |= 1 << REISERFS_ATTRS;
1157 safe_mask |= 1 << REISERFS_XATTRS_USER;
1158 safe_mask |= 1 << REISERFS_POSIXACL;
1159 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1160 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1161 safe_mask |= 1 << REISERFS_ERROR_RO;
1162 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1163 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1164 safe_mask |= 1 << REISERFS_QUOTA;
1165
1166 /* Update the bitmask, taking care to keep
1167 * the bits we're not allowed to change here */
1168 REISERFS_SB(s)->s_mount_opt =
1169 (REISERFS_SB(s)->
1170 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1171
1172 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1173 journal->j_max_commit_age = commit_max_age;
1174 journal->j_max_trans_age = commit_max_age;
1175 } else if (commit_max_age == 0) {
1176 /* 0 means restore defaults. */
1177 journal->j_max_commit_age = journal->j_default_max_commit_age;
1178 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1179 }
1180
1181 if (blocks) {
1182 int rc = reiserfs_resize(s, blocks);
1183 if (rc != 0)
1184 return rc;
1185 }
1186
1187 if (*mount_flags & MS_RDONLY) {
1188 reiserfs_xattr_init(s, *mount_flags);
1189 /* remount read-only */
1190 if (s->s_flags & MS_RDONLY)
1191 /* it is read-only already */
1192 return 0;
1193 /* try to remount file system with read-only permissions */
1194 if (sb_umount_state(rs) == REISERFS_VALID_FS
1195 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1196 return 0;
1197 }
1198
1199 err = journal_begin(&th, s, 10);
1200 if (err)
1201 return err;
1202
1203 /* Mounting a rw partition read-only. */
1204 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1205 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1206 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1207 } else {
1208 /* remount read-write */
1209 if (!(s->s_flags & MS_RDONLY)) {
1210 reiserfs_xattr_init(s, *mount_flags);
1211 return 0; /* We are read-write already */
1212 }
1213
1214 if (reiserfs_is_journal_aborted(journal))
1215 return journal->j_errno;
1216
1217 handle_data_mode(s, mount_options);
1218 handle_barrier_mode(s, mount_options);
1219 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1220 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1221 err = journal_begin(&th, s, 10);
1222 if (err)
1223 return err;
1224
1225 /* Mount a partition which is read-only, read-write */
1226 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1227 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1228 s->s_flags &= ~MS_RDONLY;
1229 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1230 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1231 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1232 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1233 }
1234 /* this will force a full flush of all journal lists */
1235 SB_JOURNAL(s)->j_must_wait = 1;
1236 err = journal_end(&th, s, 10);
1237 if (err)
1238 return err;
1239 s->s_dirt = 0;
1240
1241 if (!(*mount_flags & MS_RDONLY)) {
1242 finish_unfinished(s);
1243 reiserfs_xattr_init(s, *mount_flags);
1244 }
1245
1246 return 0;
1247 }
1248
1249 static int read_super_block(struct super_block *s, int offset)
1250 {
1251 struct buffer_head *bh;
1252 struct reiserfs_super_block *rs;
1253 int fs_blocksize;
1254
1255 bh = sb_bread(s, offset / s->s_blocksize);
1256 if (!bh) {
1257 reiserfs_warning(s, "sh-2006: read_super_block: "
1258 "bread failed (dev %s, block %lu, size %lu)",
1259 reiserfs_bdevname(s), offset / s->s_blocksize,
1260 s->s_blocksize);
1261 return 1;
1262 }
1263
1264 rs = (struct reiserfs_super_block *)bh->b_data;
1265 if (!is_any_reiserfs_magic_string(rs)) {
1266 brelse(bh);
1267 return 1;
1268 }
1269 //
1270 // ok, reiserfs signature (old or new) found in at the given offset
1271 //
1272 fs_blocksize = sb_blocksize(rs);
1273 brelse(bh);
1274 sb_set_blocksize(s, fs_blocksize);
1275
1276 bh = sb_bread(s, offset / s->s_blocksize);
1277 if (!bh) {
1278 reiserfs_warning(s, "sh-2007: read_super_block: "
1279 "bread failed (dev %s, block %lu, size %lu)\n",
1280 reiserfs_bdevname(s), offset / s->s_blocksize,
1281 s->s_blocksize);
1282 return 1;
1283 }
1284
1285 rs = (struct reiserfs_super_block *)bh->b_data;
1286 if (sb_blocksize(rs) != s->s_blocksize) {
1287 reiserfs_warning(s, "sh-2011: read_super_block: "
1288 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1289 reiserfs_bdevname(s),
1290 (unsigned long long)bh->b_blocknr,
1291 s->s_blocksize);
1292 brelse(bh);
1293 return 1;
1294 }
1295
1296 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1297 brelse(bh);
1298 reiserfs_warning(s,
1299 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1300 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1301 "get newer reiserfsprogs package");
1302 return 1;
1303 }
1304
1305 SB_BUFFER_WITH_SB(s) = bh;
1306 SB_DISK_SUPER_BLOCK(s) = rs;
1307
1308 if (is_reiserfs_jr(rs)) {
1309 /* magic is of non-standard journal filesystem, look at s_version to
1310 find which format is in use */
1311 if (sb_version(rs) == REISERFS_VERSION_2)
1312 reiserfs_warning(s,
1313 "read_super_block: found reiserfs format \"3.6\""
1314 " with non-standard journal");
1315 else if (sb_version(rs) == REISERFS_VERSION_1)
1316 reiserfs_warning(s,
1317 "read_super_block: found reiserfs format \"3.5\""
1318 " with non-standard journal");
1319 else {
1320 reiserfs_warning(s,
1321 "sh-2012: read_super_block: found unknown "
1322 "format \"%u\" of reiserfs with non-standard magic",
1323 sb_version(rs));
1324 return 1;
1325 }
1326 } else
1327 /* s_version of standard format may contain incorrect information,
1328 so we just look at the magic string */
1329 reiserfs_info(s,
1330 "found reiserfs format \"%s\" with standard journal\n",
1331 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1332
1333 s->s_op = &reiserfs_sops;
1334 s->s_export_op = &reiserfs_export_ops;
1335 #ifdef CONFIG_QUOTA
1336 s->s_qcop = &reiserfs_qctl_operations;
1337 s->dq_op = &reiserfs_quota_operations;
1338 #endif
1339
1340 /* new format is limited by the 32 bit wide i_blocks field, want to
1341 ** be one full block below that.
1342 */
1343 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1344 return 0;
1345 }
1346
1347 /* after journal replay, reread all bitmap and super blocks */
1348 static int reread_meta_blocks(struct super_block *s)
1349 {
1350 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1351 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1352 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1353 reiserfs_warning(s,
1354 "reread_meta_blocks, error reading the super");
1355 return 1;
1356 }
1357
1358 return 0;
1359 }
1360
1361 /////////////////////////////////////////////////////
1362 // hash detection stuff
1363
1364 // if root directory is empty - we set default - Yura's - hash and
1365 // warn about it
1366 // FIXME: we look for only one name in a directory. If tea and yura
1367 // bith have the same value - we ask user to send report to the
1368 // mailing list
1369 static __u32 find_hash_out(struct super_block *s)
1370 {
1371 int retval;
1372 struct inode *inode;
1373 struct cpu_key key;
1374 INITIALIZE_PATH(path);
1375 struct reiserfs_dir_entry de;
1376 __u32 hash = DEFAULT_HASH;
1377
1378 inode = s->s_root->d_inode;
1379
1380 do { // Some serious "goto"-hater was there ;)
1381 u32 teahash, r5hash, yurahash;
1382
1383 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1384 retval = search_by_entry_key(s, &key, &path, &de);
1385 if (retval == IO_ERROR) {
1386 pathrelse(&path);
1387 return UNSET_HASH;
1388 }
1389 if (retval == NAME_NOT_FOUND)
1390 de.de_entry_num--;
1391 set_de_name_and_namelen(&de);
1392 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1393 /* allow override in this case */
1394 if (reiserfs_rupasov_hash(s)) {
1395 hash = YURA_HASH;
1396 }
1397 reiserfs_warning(s, "FS seems to be empty, autodetect "
1398 "is using the default hash");
1399 break;
1400 }
1401 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1402 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1403 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1404 if (((teahash == r5hash)
1405 &&
1406 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1407 == r5hash)) || ((teahash == yurahash)
1408 && (yurahash ==
1409 GET_HASH_VALUE(deh_offset
1410 (&
1411 (de.
1412 de_deh[de.
1413 de_entry_num])))))
1414 || ((r5hash == yurahash)
1415 && (yurahash ==
1416 GET_HASH_VALUE(deh_offset
1417 (&(de.de_deh[de.de_entry_num])))))) {
1418 reiserfs_warning(s,
1419 "Unable to automatically detect hash function. "
1420 "Please mount with -o hash={tea,rupasov,r5}",
1421 reiserfs_bdevname(s));
1422 hash = UNSET_HASH;
1423 break;
1424 }
1425 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1426 yurahash)
1427 hash = YURA_HASH;
1428 else if (GET_HASH_VALUE
1429 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1430 hash = TEA_HASH;
1431 else if (GET_HASH_VALUE
1432 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1433 hash = R5_HASH;
1434 else {
1435 reiserfs_warning(s, "Unrecognised hash function");
1436 hash = UNSET_HASH;
1437 }
1438 } while (0);
1439
1440 pathrelse(&path);
1441 return hash;
1442 }
1443
1444 // finds out which hash names are sorted with
1445 static int what_hash(struct super_block *s)
1446 {
1447 __u32 code;
1448
1449 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1450
1451 /* reiserfs_hash_detect() == true if any of the hash mount options
1452 ** were used. We must check them to make sure the user isn't
1453 ** using a bad hash value
1454 */
1455 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1456 code = find_hash_out(s);
1457
1458 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1459 /* detection has found the hash, and we must check against the
1460 ** mount options
1461 */
1462 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1463 reiserfs_warning(s, "Error, %s hash detected, "
1464 "unable to force rupasov hash",
1465 reiserfs_hashname(code));
1466 code = UNSET_HASH;
1467 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1468 reiserfs_warning(s, "Error, %s hash detected, "
1469 "unable to force tea hash",
1470 reiserfs_hashname(code));
1471 code = UNSET_HASH;
1472 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1473 reiserfs_warning(s, "Error, %s hash detected, "
1474 "unable to force r5 hash",
1475 reiserfs_hashname(code));
1476 code = UNSET_HASH;
1477 }
1478 } else {
1479 /* find_hash_out was not called or could not determine the hash */
1480 if (reiserfs_rupasov_hash(s)) {
1481 code = YURA_HASH;
1482 } else if (reiserfs_tea_hash(s)) {
1483 code = TEA_HASH;
1484 } else if (reiserfs_r5_hash(s)) {
1485 code = R5_HASH;
1486 }
1487 }
1488
1489 /* if we are mounted RW, and we have a new valid hash code, update
1490 ** the super
1491 */
1492 if (code != UNSET_HASH &&
1493 !(s->s_flags & MS_RDONLY) &&
1494 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1495 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1496 }
1497 return code;
1498 }
1499
1500 // return pointer to appropriate function
1501 static hashf_t hash_function(struct super_block *s)
1502 {
1503 switch (what_hash(s)) {
1504 case TEA_HASH:
1505 reiserfs_info(s, "Using tea hash to sort names\n");
1506 return keyed_hash;
1507 case YURA_HASH:
1508 reiserfs_info(s, "Using rupasov hash to sort names\n");
1509 return yura_hash;
1510 case R5_HASH:
1511 reiserfs_info(s, "Using r5 hash to sort names\n");
1512 return r5_hash;
1513 }
1514 return NULL;
1515 }
1516
1517 // this is used to set up correct value for old partitions
1518 static int function2code(hashf_t func)
1519 {
1520 if (func == keyed_hash)
1521 return TEA_HASH;
1522 if (func == yura_hash)
1523 return YURA_HASH;
1524 if (func == r5_hash)
1525 return R5_HASH;
1526
1527 BUG(); // should never happen
1528
1529 return 0;
1530 }
1531
1532 #define SWARN(silent, s, ...) \
1533 if (!(silent)) \
1534 reiserfs_warning (s, __VA_ARGS__)
1535
1536 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1537 {
1538 struct inode *root_inode;
1539 struct reiserfs_transaction_handle th;
1540 int old_format = 0;
1541 unsigned long blocks;
1542 unsigned int commit_max_age = 0;
1543 int jinit_done = 0;
1544 struct reiserfs_iget_args args;
1545 struct reiserfs_super_block *rs;
1546 char *jdev_name;
1547 struct reiserfs_sb_info *sbi;
1548 int errval = -EINVAL;
1549
1550 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1551 if (!sbi) {
1552 errval = -ENOMEM;
1553 goto error;
1554 }
1555 s->s_fs_info = sbi;
1556 /* Set default values for options: non-aggressive tails, RO on errors */
1557 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1558 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1559 /* no preallocation minimum, be smart in
1560 reiserfs_file_write instead */
1561 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1562 /* Preallocate by 16 blocks (17-1) at once */
1563 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1564 #ifdef CONFIG_REISERFS_FS_XATTR
1565 /* Initialize the rwsem for xattr dir */
1566 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1567 #endif
1568 /* setup default block allocator options */
1569 reiserfs_init_alloc_options(s);
1570
1571 jdev_name = NULL;
1572 if (reiserfs_parse_options
1573 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1574 &commit_max_age) == 0) {
1575 goto error;
1576 }
1577
1578 if (blocks) {
1579 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1580 "for remount only");
1581 goto error;
1582 }
1583
1584 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1585 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1586 old_format = 1;
1587 /* try new format (64-th 1k block), which can contain reiserfs super block */
1588 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1589 SWARN(silent, s,
1590 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1591 reiserfs_bdevname(s));
1592 goto error;
1593 }
1594
1595 rs = SB_DISK_SUPER_BLOCK(s);
1596 /* Let's do basic sanity check to verify that underlying device is not
1597 smaller than the filesystem. If the check fails then abort and scream,
1598 because bad stuff will happen otherwise. */
1599 if (s->s_bdev && s->s_bdev->bd_inode
1600 && i_size_read(s->s_bdev->bd_inode) <
1601 sb_block_count(rs) * sb_blocksize(rs)) {
1602 SWARN(silent, s,
1603 "Filesystem on %s cannot be mounted because it is bigger than the device",
1604 reiserfs_bdevname(s));
1605 SWARN(silent, s,
1606 "You may need to run fsck or increase size of your LVM partition");
1607 SWARN(silent, s,
1608 "Or may be you forgot to reboot after fdisk when it told you to");
1609 goto error;
1610 }
1611
1612 sbi->s_mount_state = SB_REISERFS_STATE(s);
1613 sbi->s_mount_state = REISERFS_VALID_FS;
1614
1615 if ((errval = reiserfs_init_bitmap_cache(s))) {
1616 SWARN(silent, s,
1617 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1618 goto error;
1619 }
1620 errval = -EINVAL;
1621 #ifdef CONFIG_REISERFS_CHECK
1622 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1623 SWARN(silent, s, "- it is slow mode for debugging.");
1624 #endif
1625
1626 /* make data=ordered the default */
1627 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1628 !reiserfs_data_writeback(s)) {
1629 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1630 }
1631
1632 if (reiserfs_data_log(s)) {
1633 reiserfs_info(s, "using journaled data mode\n");
1634 } else if (reiserfs_data_ordered(s)) {
1635 reiserfs_info(s, "using ordered data mode\n");
1636 } else {
1637 reiserfs_info(s, "using writeback data mode\n");
1638 }
1639 if (reiserfs_barrier_flush(s)) {
1640 printk("reiserfs: using flush barriers\n");
1641 }
1642 // set_device_ro(s->s_dev, 1) ;
1643 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1644 SWARN(silent, s,
1645 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1646 goto error;
1647 } else {
1648 jinit_done = 1; /* once this is set, journal_release must be called
1649 ** if we error out of the mount
1650 */
1651 }
1652 if (reread_meta_blocks(s)) {
1653 SWARN(silent, s,
1654 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1655 goto error;
1656 }
1657
1658 if (replay_only(s))
1659 goto error;
1660
1661 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1662 SWARN(silent, s,
1663 "clm-7000: Detected readonly device, marking FS readonly");
1664 s->s_flags |= MS_RDONLY;
1665 }
1666 args.objectid = REISERFS_ROOT_OBJECTID;
1667 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1668 root_inode =
1669 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1670 reiserfs_init_locked_inode, (void *)(&args));
1671 if (!root_inode) {
1672 SWARN(silent, s,
1673 "jmacd-10: reiserfs_fill_super: get root inode failed");
1674 goto error;
1675 }
1676
1677 if (root_inode->i_state & I_NEW) {
1678 reiserfs_read_locked_inode(root_inode, &args);
1679 unlock_new_inode(root_inode);
1680 }
1681
1682 s->s_root = d_alloc_root(root_inode);
1683 if (!s->s_root) {
1684 iput(root_inode);
1685 goto error;
1686 }
1687 // define and initialize hash function
1688 sbi->s_hash_function = hash_function(s);
1689 if (sbi->s_hash_function == NULL) {
1690 dput(s->s_root);
1691 s->s_root = NULL;
1692 goto error;
1693 }
1694
1695 if (is_reiserfs_3_5(rs)
1696 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1697 set_bit(REISERFS_3_5, &(sbi->s_properties));
1698 else if (old_format)
1699 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1700 else
1701 set_bit(REISERFS_3_6, &(sbi->s_properties));
1702
1703 if (!(s->s_flags & MS_RDONLY)) {
1704
1705 errval = journal_begin(&th, s, 1);
1706 if (errval) {
1707 dput(s->s_root);
1708 s->s_root = NULL;
1709 goto error;
1710 }
1711 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1712
1713 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1714 set_sb_fs_state(rs, 0);
1715
1716 if (old_format_only(s)) {
1717 /* filesystem of format 3.5 either with standard or non-standard
1718 journal */
1719 if (convert_reiserfs(s)) {
1720 /* and -o conv is given */
1721 if (!silent)
1722 reiserfs_info(s,
1723 "converting 3.5 filesystem to the 3.6 format");
1724
1725 if (is_reiserfs_3_5(rs))
1726 /* put magic string of 3.6 format. 2.2 will not be able to
1727 mount this filesystem anymore */
1728 memcpy(rs->s_v1.s_magic,
1729 reiserfs_3_6_magic_string,
1730 sizeof
1731 (reiserfs_3_6_magic_string));
1732
1733 set_sb_version(rs, REISERFS_VERSION_2);
1734 reiserfs_convert_objectid_map_v1(s);
1735 set_bit(REISERFS_3_6, &(sbi->s_properties));
1736 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1737 } else if (!silent) {
1738 reiserfs_info(s, "using 3.5.x disk format\n");
1739 }
1740 }
1741
1742 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1743 errval = journal_end(&th, s, 1);
1744 if (errval) {
1745 dput(s->s_root);
1746 s->s_root = NULL;
1747 goto error;
1748 }
1749
1750 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1751 dput(s->s_root);
1752 s->s_root = NULL;
1753 goto error;
1754 }
1755
1756 /* look for files which were to be removed in previous session */
1757 finish_unfinished(s);
1758 } else {
1759 if (old_format_only(s) && !silent) {
1760 reiserfs_info(s, "using 3.5.x disk format\n");
1761 }
1762
1763 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1764 dput(s->s_root);
1765 s->s_root = NULL;
1766 goto error;
1767 }
1768 }
1769 // mark hash in super block: it could be unset. overwrite should be ok
1770 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1771
1772 handle_attrs(s);
1773
1774 reiserfs_proc_info_init(s);
1775
1776 init_waitqueue_head(&(sbi->s_wait));
1777 spin_lock_init(&sbi->bitmap_lock);
1778
1779 return (0);
1780
1781 error:
1782 if (jinit_done) { /* kill the commit thread, free journal ram */
1783 journal_release_error(NULL, s);
1784 }
1785
1786 reiserfs_free_bitmap_cache(s);
1787 if (SB_BUFFER_WITH_SB(s))
1788 brelse(SB_BUFFER_WITH_SB(s));
1789 #ifdef CONFIG_QUOTA
1790 {
1791 int j;
1792 for (j = 0; j < MAXQUOTAS; j++) {
1793 kfree(sbi->s_qf_names[j]);
1794 sbi->s_qf_names[j] = NULL;
1795 }
1796 }
1797 #endif
1798 kfree(sbi);
1799
1800 s->s_fs_info = NULL;
1801 return errval;
1802 }
1803
1804 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1805 {
1806 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1807
1808 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1809 buf->f_bfree = sb_free_blocks(rs);
1810 buf->f_bavail = buf->f_bfree;
1811 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1812 buf->f_bsize = dentry->d_sb->s_blocksize;
1813 /* changed to accommodate gcc folks. */
1814 buf->f_type = REISERFS_SUPER_MAGIC;
1815 return 0;
1816 }
1817
1818 #ifdef CONFIG_QUOTA
1819 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1820 {
1821 struct reiserfs_transaction_handle th;
1822 int ret, err;
1823
1824 /* We may create quota structure so we need to reserve enough blocks */
1825 reiserfs_write_lock(inode->i_sb);
1826 ret =
1827 journal_begin(&th, inode->i_sb,
1828 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1829 if (ret)
1830 goto out;
1831 ret = dquot_initialize(inode, type);
1832 err =
1833 journal_end(&th, inode->i_sb,
1834 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1835 if (!ret && err)
1836 ret = err;
1837 out:
1838 reiserfs_write_unlock(inode->i_sb);
1839 return ret;
1840 }
1841
1842 static int reiserfs_dquot_drop(struct inode *inode)
1843 {
1844 struct reiserfs_transaction_handle th;
1845 int ret, err;
1846
1847 /* We may delete quota structure so we need to reserve enough blocks */
1848 reiserfs_write_lock(inode->i_sb);
1849 ret =
1850 journal_begin(&th, inode->i_sb,
1851 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1852 if (ret)
1853 goto out;
1854 ret = dquot_drop(inode);
1855 err =
1856 journal_end(&th, inode->i_sb,
1857 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1858 if (!ret && err)
1859 ret = err;
1860 out:
1861 reiserfs_write_unlock(inode->i_sb);
1862 return ret;
1863 }
1864
1865 static int reiserfs_write_dquot(struct dquot *dquot)
1866 {
1867 struct reiserfs_transaction_handle th;
1868 int ret, err;
1869
1870 reiserfs_write_lock(dquot->dq_sb);
1871 ret =
1872 journal_begin(&th, dquot->dq_sb,
1873 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1874 if (ret)
1875 goto out;
1876 ret = dquot_commit(dquot);
1877 err =
1878 journal_end(&th, dquot->dq_sb,
1879 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1880 if (!ret && err)
1881 ret = err;
1882 out:
1883 reiserfs_write_unlock(dquot->dq_sb);
1884 return ret;
1885 }
1886
1887 static int reiserfs_acquire_dquot(struct dquot *dquot)
1888 {
1889 struct reiserfs_transaction_handle th;
1890 int ret, err;
1891
1892 reiserfs_write_lock(dquot->dq_sb);
1893 ret =
1894 journal_begin(&th, dquot->dq_sb,
1895 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1896 if (ret)
1897 goto out;
1898 ret = dquot_acquire(dquot);
1899 err =
1900 journal_end(&th, dquot->dq_sb,
1901 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1902 if (!ret && err)
1903 ret = err;
1904 out:
1905 reiserfs_write_unlock(dquot->dq_sb);
1906 return ret;
1907 }
1908
1909 static int reiserfs_release_dquot(struct dquot *dquot)
1910 {
1911 struct reiserfs_transaction_handle th;
1912 int ret, err;
1913
1914 reiserfs_write_lock(dquot->dq_sb);
1915 ret =
1916 journal_begin(&th, dquot->dq_sb,
1917 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1918 if (ret) {
1919 /* Release dquot anyway to avoid endless cycle in dqput() */
1920 dquot_release(dquot);
1921 goto out;
1922 }
1923 ret = dquot_release(dquot);
1924 err =
1925 journal_end(&th, dquot->dq_sb,
1926 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1927 if (!ret && err)
1928 ret = err;
1929 out:
1930 reiserfs_write_unlock(dquot->dq_sb);
1931 return ret;
1932 }
1933
1934 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1935 {
1936 /* Are we journalling quotas? */
1937 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1938 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1939 dquot_mark_dquot_dirty(dquot);
1940 return reiserfs_write_dquot(dquot);
1941 } else
1942 return dquot_mark_dquot_dirty(dquot);
1943 }
1944
1945 static int reiserfs_write_info(struct super_block *sb, int type)
1946 {
1947 struct reiserfs_transaction_handle th;
1948 int ret, err;
1949
1950 /* Data block + inode block */
1951 reiserfs_write_lock(sb);
1952 ret = journal_begin(&th, sb, 2);
1953 if (ret)
1954 goto out;
1955 ret = dquot_commit_info(sb, type);
1956 err = journal_end(&th, sb, 2);
1957 if (!ret && err)
1958 ret = err;
1959 out:
1960 reiserfs_write_unlock(sb);
1961 return ret;
1962 }
1963
1964 /*
1965 * Turn on quotas during mount time - we need to find the quota file and such...
1966 */
1967 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
1968 {
1969 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
1970 REISERFS_SB(sb)->s_jquota_fmt, type);
1971 }
1972
1973 /*
1974 * Standard function to be called on quota_on
1975 */
1976 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
1977 char *path)
1978 {
1979 int err;
1980 struct nameidata nd;
1981
1982 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
1983 return -EINVAL;
1984 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
1985 if (err)
1986 return err;
1987 /* Quotafile not on the same filesystem? */
1988 if (nd.mnt->mnt_sb != sb) {
1989 path_release(&nd);
1990 return -EXDEV;
1991 }
1992 /* We must not pack tails for quota files on reiserfs for quota IO to work */
1993 if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
1994 reiserfs_warning(sb,
1995 "reiserfs: Quota file must have tail packing disabled.");
1996 path_release(&nd);
1997 return -EINVAL;
1998 }
1999 /* Not journalling quota? No more tests needed... */
2000 if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2001 !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2002 path_release(&nd);
2003 return vfs_quota_on(sb, type, format_id, path);
2004 }
2005 /* Quotafile not of fs root? */
2006 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2007 reiserfs_warning(sb,
2008 "reiserfs: Quota file not on filesystem root. "
2009 "Journalled quota will not work.");
2010 path_release(&nd);
2011 return vfs_quota_on(sb, type, format_id, path);
2012 }
2013
2014 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2015 * acquiring the locks... As quota files are never truncated and quota code
2016 * itself serializes the operations (and noone else should touch the files)
2017 * we don't have to be afraid of races */
2018 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2019 size_t len, loff_t off)
2020 {
2021 struct inode *inode = sb_dqopt(sb)->files[type];
2022 unsigned long blk = off >> sb->s_blocksize_bits;
2023 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2024 size_t toread;
2025 struct buffer_head tmp_bh, *bh;
2026 loff_t i_size = i_size_read(inode);
2027
2028 if (off > i_size)
2029 return 0;
2030 if (off + len > i_size)
2031 len = i_size - off;
2032 toread = len;
2033 while (toread > 0) {
2034 tocopy =
2035 sb->s_blocksize - offset <
2036 toread ? sb->s_blocksize - offset : toread;
2037 tmp_bh.b_state = 0;
2038 /* Quota files are without tails so we can safely use this function */
2039 reiserfs_write_lock(sb);
2040 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2041 reiserfs_write_unlock(sb);
2042 if (err)
2043 return err;
2044 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2045 memset(data, 0, tocopy);
2046 else {
2047 bh = sb_bread(sb, tmp_bh.b_blocknr);
2048 if (!bh)
2049 return -EIO;
2050 memcpy(data, bh->b_data + offset, tocopy);
2051 brelse(bh);
2052 }
2053 offset = 0;
2054 toread -= tocopy;
2055 data += tocopy;
2056 blk++;
2057 }
2058 return len;
2059 }
2060
2061 /* Write to quotafile (we know the transaction is already started and has
2062 * enough credits) */
2063 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2064 const char *data, size_t len, loff_t off)
2065 {
2066 struct inode *inode = sb_dqopt(sb)->files[type];
2067 unsigned long blk = off >> sb->s_blocksize_bits;
2068 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2069 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2070 size_t towrite = len;
2071 struct buffer_head tmp_bh, *bh;
2072
2073 if (!current->journal_info) {
2074 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2075 " cancelled because transaction is not started.\n",
2076 (unsigned long long)off, (unsigned long long)len);
2077 return -EIO;
2078 }
2079 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2080 while (towrite > 0) {
2081 tocopy = sb->s_blocksize - offset < towrite ?
2082 sb->s_blocksize - offset : towrite;
2083 tmp_bh.b_state = 0;
2084 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2085 if (err)
2086 goto out;
2087 if (offset || tocopy != sb->s_blocksize)
2088 bh = sb_bread(sb, tmp_bh.b_blocknr);
2089 else
2090 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2091 if (!bh) {
2092 err = -EIO;
2093 goto out;
2094 }
2095 lock_buffer(bh);
2096 memcpy(bh->b_data + offset, data, tocopy);
2097 flush_dcache_page(bh->b_page);
2098 set_buffer_uptodate(bh);
2099 unlock_buffer(bh);
2100 reiserfs_prepare_for_journal(sb, bh, 1);
2101 journal_mark_dirty(current->journal_info, sb, bh);
2102 if (!journal_quota)
2103 reiserfs_add_ordered_list(inode, bh);
2104 brelse(bh);
2105 offset = 0;
2106 towrite -= tocopy;
2107 data += tocopy;
2108 blk++;
2109 }
2110 out:
2111 if (len == towrite)
2112 return err;
2113 if (inode->i_size < off + len - towrite)
2114 i_size_write(inode, off + len - towrite);
2115 inode->i_version++;
2116 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2117 mark_inode_dirty(inode);
2118 mutex_unlock(&inode->i_mutex);
2119 return len - towrite;
2120 }
2121
2122 #endif
2123
2124 static int get_super_block(struct file_system_type *fs_type,
2125 int flags, const char *dev_name,
2126 void *data, struct vfsmount *mnt)
2127 {
2128 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2129 mnt);
2130 }
2131
2132 static int __init init_reiserfs_fs(void)
2133 {
2134 int ret;
2135
2136 if ((ret = init_inodecache())) {
2137 return ret;
2138 }
2139
2140 if ((ret = reiserfs_xattr_register_handlers()))
2141 goto failed_reiserfs_xattr_register_handlers;
2142
2143 reiserfs_proc_info_global_init();
2144 reiserfs_proc_register_global("version",
2145 reiserfs_global_version_in_proc);
2146
2147 ret = register_filesystem(&reiserfs_fs_type);
2148
2149 if (ret == 0) {
2150 return 0;
2151 }
2152
2153 reiserfs_xattr_unregister_handlers();
2154
2155 failed_reiserfs_xattr_register_handlers:
2156 reiserfs_proc_unregister_global("version");
2157 reiserfs_proc_info_global_done();
2158 destroy_inodecache();
2159
2160 return ret;
2161 }
2162
2163 static void __exit exit_reiserfs_fs(void)
2164 {
2165 reiserfs_xattr_unregister_handlers();
2166 reiserfs_proc_unregister_global("version");
2167 reiserfs_proc_info_global_done();
2168 unregister_filesystem(&reiserfs_fs_type);
2169 destroy_inodecache();
2170 }
2171
2172 struct file_system_type reiserfs_fs_type = {
2173 .owner = THIS_MODULE,
2174 .name = "reiserfs",
2175 .get_sb = get_super_block,
2176 .kill_sb = reiserfs_kill_sb,
2177 .fs_flags = FS_REQUIRES_DEV,
2178 };
2179
2180 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2181 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2182 MODULE_LICENSE("GPL");
2183
2184 module_init(init_reiserfs_fs);
2185 module_exit(exit_reiserfs_fs);
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