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[ALSA] snd hda suspend latency: shorten codec read
[wrt350n-kernel.git] / fs / reiserfs / super.c
blob5cd85fe5df5d9671516a03d3c9927b96ea0e7c63
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, last_inode_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 memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172 /* Needed for iput() to work correctly and not trash data */
173 if (s->s_flags & MS_ACTIVE) {
174 ms_active_set = 0;
175 } else {
176 ms_active_set = 1;
177 s->s_flags |= MS_ACTIVE;
178 }
179 /* Turn on quotas so that they are updated correctly */
180 for (i = 0; i < MAXQUOTAS; i++) {
181 if (REISERFS_SB(s)->s_qf_names[i]) {
182 int ret = reiserfs_quota_on_mount(s, i);
183 if (ret < 0)
184 reiserfs_warning(s,
185 "reiserfs: cannot turn on journalled quota: error %d",
186 ret);
187 }
188 }
189 #endif
190
191 done = 0;
192 REISERFS_SB(s)->s_is_unlinked_ok = 1;
193 while (!retval) {
194 retval = search_item(s, &max_cpu_key, &path);
195 if (retval != ITEM_NOT_FOUND) {
196 reiserfs_warning(s,
197 "vs-2140: finish_unfinished: search_by_key returned %d",
198 retval);
199 break;
200 }
201
202 bh = get_last_bh(&path);
203 item_pos = get_item_pos(&path);
204 if (item_pos != B_NR_ITEMS(bh)) {
205 reiserfs_warning(s,
206 "vs-2060: finish_unfinished: wrong position found");
207 break;
208 }
209 item_pos--;
210 ih = B_N_PITEM_HEAD(bh, item_pos);
211
212 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
213 /* there are no "save" links anymore */
214 break;
215
216 save_link_key = ih->ih_key;
217 if (is_indirect_le_ih(ih))
218 truncate = 1;
219 else
220 truncate = 0;
221
222 /* reiserfs_iget needs k_dirid and k_objectid only */
223 item = B_I_PITEM(bh, ih);
224 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
225 obj_key.on_disk_key.k_objectid =
226 le32_to_cpu(ih->ih_key.k_objectid);
227 obj_key.on_disk_key.k_offset = 0;
228 obj_key.on_disk_key.k_type = 0;
229
230 pathrelse(&path);
231
232 inode = reiserfs_iget(s, &obj_key);
233 if (!inode) {
234 /* the unlink almost completed, it just did not manage to remove
235 "save" link and release objectid */
236 reiserfs_warning(s,
237 "vs-2180: finish_unfinished: iget failed for %K",
238 &obj_key);
239 retval = remove_save_link_only(s, &save_link_key, 1);
240 continue;
241 }
242
243 if (!truncate && inode->i_nlink) {
244 /* file is not unlinked */
245 reiserfs_warning(s,
246 "vs-2185: finish_unfinished: file %K is not unlinked",
247 &obj_key);
248 retval = remove_save_link_only(s, &save_link_key, 0);
249 continue;
250 }
251 DQUOT_INIT(inode);
252
253 if (truncate && S_ISDIR(inode->i_mode)) {
254 /* We got a truncate request for a dir which is impossible.
255 The only imaginable way is to execute unfinished truncate request
256 then boot into old kernel, remove the file and create dir with
257 the same key. */
258 reiserfs_warning(s,
259 "green-2101: impossible truncate on a directory %k. Please report",
260 INODE_PKEY(inode));
261 retval = remove_save_link_only(s, &save_link_key, 0);
262 truncate = 0;
263 iput(inode);
264 continue;
265 }
266
267 if (truncate) {
268 REISERFS_I(inode)->i_flags |=
269 i_link_saved_truncate_mask;
270 /* not completed truncate found. New size was committed together
271 with "save" link */
272 reiserfs_info(s, "Truncating %k to %Ld ..",
273 INODE_PKEY(inode), inode->i_size);
274 reiserfs_truncate_file(inode,
275 0
276 /*don't update modification time */
277 );
278 retval = remove_save_link(inode, truncate);
279 } else {
280 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
281 /* not completed unlink (rmdir) found */
282 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
283 if (memcmp(&last_inode_key, INODE_PKEY(inode),
284 sizeof(last_inode_key))){
285 last_inode_key = *INODE_PKEY(inode);
286 /* removal gets completed in iput */
287 retval = 0;
288 } else {
289 reiserfs_warning(s, "Dead loop in "
290 "finish_unfinished detected, "
291 "just remove save link\n");
292 retval = remove_save_link_only(s,
293 &save_link_key, 0);
294 }
295 }
296
297 iput(inode);
298 printk("done\n");
299 done++;
300 }
301 REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304 /* Turn quotas off */
305 for (i = 0; i < MAXQUOTAS; i++) {
306 if (sb_dqopt(s)->files[i])
307 vfs_quota_off_mount(s, i);
308 }
309 if (ms_active_set)
310 /* Restore the flag back */
311 s->s_flags &= ~MS_ACTIVE;
312 #endif
313 pathrelse(&path);
314 if (done)
315 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316 "Completed\n", done);
317 return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321 being unlinked. This link will be deleted in the same transaction with last
322 item of file. mounting the filesystem we scan all these links and remove
323 files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325 struct inode *inode, int truncate)
326 {
327 INITIALIZE_PATH(path);
328 int retval;
329 struct cpu_key key;
330 struct item_head ih;
331 __le32 link;
332
333 BUG_ON(!th->t_trans_id);
334
335 /* file can only get one "save link" of each kind */
336 RFALSE(truncate &&
337 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338 "saved link already exists for truncated inode %lx",
339 (long)inode->i_ino);
340 RFALSE(!truncate &&
341 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342 "saved link already exists for unlinked inode %lx",
343 (long)inode->i_ino);
344
345 /* setup key of "save" link */
346 key.version = KEY_FORMAT_3_5;
347 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348 key.on_disk_key.k_objectid = inode->i_ino;
349 if (!truncate) {
350 /* unlink, rmdir, rename */
351 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354 /* item head of "safe" link */
355 make_le_item_head(&ih, &key, key.version,
356 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357 4 /*length */ , 0xffff /*free space */ );
358 } else {
359 /* truncate */
360 if (S_ISDIR(inode->i_mode))
361 reiserfs_warning(inode->i_sb,
362 "green-2102: Adding a truncate savelink for a directory %k! Please report",
363 INODE_PKEY(inode));
364 set_cpu_key_k_offset(&key, 1);
365 set_cpu_key_k_type(&key, TYPE_INDIRECT);
366
367 /* item head of "safe" link */
368 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
369 4 /*length */ , 0 /*free space */ );
370 }
371 key.key_length = 3;
372
373 /* look for its place in the tree */
374 retval = search_item(inode->i_sb, &key, &path);
375 if (retval != ITEM_NOT_FOUND) {
376 if (retval != -ENOSPC)
377 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
378 "search_by_key (%K) returned %d", &key,
379 retval);
380 pathrelse(&path);
381 return;
382 }
383
384 /* body of "save" link */
385 link = INODE_PKEY(inode)->k_dir_id;
386
387 /* put "save" link inot tree, don't charge quota to anyone */
388 retval =
389 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
390 if (retval) {
391 if (retval != -ENOSPC)
392 reiserfs_warning(inode->i_sb,
393 "vs-2120: add_save_link: insert_item returned %d",
394 retval);
395 } else {
396 if (truncate)
397 REISERFS_I(inode)->i_flags |=
398 i_link_saved_truncate_mask;
399 else
400 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401 }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407 struct reiserfs_transaction_handle th;
408 struct reiserfs_key key;
409 int err;
410
411 /* we are going to do one balancing only */
412 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413 if (err)
414 return err;
415
416 /* setup key of "save" link */
417 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418 key.k_objectid = INODE_PKEY(inode)->k_objectid;
419 if (!truncate) {
420 /* unlink, rmdir, rename */
421 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422 1 + inode->i_sb->s_blocksize);
423 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424 } else {
425 /* truncate */
426 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428 }
429
430 if ((truncate &&
431 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432 (!truncate &&
433 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434 /* don't take quota bytes from anywhere */
435 reiserfs_delete_solid_item(&th, NULL, &key);
436 if (!truncate) {
437 reiserfs_release_objectid(&th, inode->i_ino);
438 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439 } else
440 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447 if (REISERFS_SB(s)) {
448 #ifdef CONFIG_REISERFS_FS_XATTR
449 if (REISERFS_SB(s)->xattr_root) {
450 d_invalidate(REISERFS_SB(s)->xattr_root);
451 dput(REISERFS_SB(s)->xattr_root);
452 REISERFS_SB(s)->xattr_root = NULL;
453 }
454 #endif
455 if (REISERFS_SB(s)->priv_root) {
456 d_invalidate(REISERFS_SB(s)->priv_root);
457 dput(REISERFS_SB(s)->priv_root);
458 REISERFS_SB(s)->priv_root = NULL;
459 }
460 }
461
462 kill_block_super(s);
463 }
464
465 static void reiserfs_put_super(struct super_block *s)
466 {
467 struct reiserfs_transaction_handle th;
468 th.t_trans_id = 0;
469
470 /* change file system state to current state if it was mounted with read-write permissions */
471 if (!(s->s_flags & MS_RDONLY)) {
472 if (!journal_begin(&th, s, 10)) {
473 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
474 1);
475 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
476 REISERFS_SB(s)->s_mount_state);
477 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
478 }
479 }
480
481 /* note, journal_release checks for readonly mount, and can decide not
482 ** to do a journal_end
483 */
484 journal_release(&th, s);
485
486 reiserfs_free_bitmap_cache(s);
487
488 brelse(SB_BUFFER_WITH_SB(s));
489
490 print_statistics(s);
491
492 if (REISERFS_SB(s)->reserved_blocks != 0) {
493 reiserfs_warning(s,
494 "green-2005: reiserfs_put_super: reserved blocks left %d",
495 REISERFS_SB(s)->reserved_blocks);
496 }
497
498 reiserfs_proc_info_done(s);
499
500 kfree(s->s_fs_info);
501 s->s_fs_info = NULL;
502
503 return;
504 }
505
506 static struct kmem_cache *reiserfs_inode_cachep;
507
508 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
509 {
510 struct reiserfs_inode_info *ei;
511 ei = (struct reiserfs_inode_info *)
512 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
513 if (!ei)
514 return NULL;
515 return &ei->vfs_inode;
516 }
517
518 static void reiserfs_destroy_inode(struct inode *inode)
519 {
520 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
521 }
522
523 static void init_once(struct kmem_cache * cachep, void *foo)
524 {
525 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
526
527 INIT_LIST_HEAD(&ei->i_prealloc_list);
528 inode_init_once(&ei->vfs_inode);
529 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
530 ei->i_acl_access = NULL;
531 ei->i_acl_default = NULL;
532 #endif
533 }
534
535 static int init_inodecache(void)
536 {
537 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
538 sizeof(struct
539 reiserfs_inode_info),
540 0, (SLAB_RECLAIM_ACCOUNT|
541 SLAB_MEM_SPREAD),
542 init_once);
543 if (reiserfs_inode_cachep == NULL)
544 return -ENOMEM;
545 return 0;
546 }
547
548 static void destroy_inodecache(void)
549 {
550 kmem_cache_destroy(reiserfs_inode_cachep);
551 }
552
553 /* we don't mark inodes dirty, we just log them */
554 static void reiserfs_dirty_inode(struct inode *inode)
555 {
556 struct reiserfs_transaction_handle th;
557
558 int err = 0;
559 if (inode->i_sb->s_flags & MS_RDONLY) {
560 reiserfs_warning(inode->i_sb,
561 "clm-6006: writing inode %lu on readonly FS",
562 inode->i_ino);
563 return;
564 }
565 reiserfs_write_lock(inode->i_sb);
566
567 /* this is really only used for atime updates, so they don't have
568 ** to be included in O_SYNC or fsync
569 */
570 err = journal_begin(&th, inode->i_sb, 1);
571 if (err) {
572 reiserfs_write_unlock(inode->i_sb);
573 return;
574 }
575 reiserfs_update_sd(&th, inode);
576 journal_end(&th, inode->i_sb, 1);
577 reiserfs_write_unlock(inode->i_sb);
578 }
579
580 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
581 static void reiserfs_clear_inode(struct inode *inode)
582 {
583 struct posix_acl *acl;
584
585 acl = REISERFS_I(inode)->i_acl_access;
586 if (acl && !IS_ERR(acl))
587 posix_acl_release(acl);
588 REISERFS_I(inode)->i_acl_access = NULL;
589
590 acl = REISERFS_I(inode)->i_acl_default;
591 if (acl && !IS_ERR(acl))
592 posix_acl_release(acl);
593 REISERFS_I(inode)->i_acl_default = NULL;
594 }
595 #else
596 #define reiserfs_clear_inode NULL
597 #endif
598
599 #ifdef CONFIG_QUOTA
600 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
601 size_t, loff_t);
602 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
603 loff_t);
604 #endif
605
606 static const struct super_operations reiserfs_sops = {
607 .alloc_inode = reiserfs_alloc_inode,
608 .destroy_inode = reiserfs_destroy_inode,
609 .write_inode = reiserfs_write_inode,
610 .dirty_inode = reiserfs_dirty_inode,
611 .delete_inode = reiserfs_delete_inode,
612 .clear_inode = reiserfs_clear_inode,
613 .put_super = reiserfs_put_super,
614 .write_super = reiserfs_write_super,
615 .sync_fs = reiserfs_sync_fs,
616 .write_super_lockfs = reiserfs_write_super_lockfs,
617 .unlockfs = reiserfs_unlockfs,
618 .statfs = reiserfs_statfs,
619 .remount_fs = reiserfs_remount,
620 #ifdef CONFIG_QUOTA
621 .quota_read = reiserfs_quota_read,
622 .quota_write = reiserfs_quota_write,
623 #endif
624 };
625
626 #ifdef CONFIG_QUOTA
627 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
628
629 static int reiserfs_dquot_initialize(struct inode *, int);
630 static int reiserfs_dquot_drop(struct inode *);
631 static int reiserfs_write_dquot(struct dquot *);
632 static int reiserfs_acquire_dquot(struct dquot *);
633 static int reiserfs_release_dquot(struct dquot *);
634 static int reiserfs_mark_dquot_dirty(struct dquot *);
635 static int reiserfs_write_info(struct super_block *, int);
636 static int reiserfs_quota_on(struct super_block *, int, int, char *);
637
638 static struct dquot_operations reiserfs_quota_operations = {
639 .initialize = reiserfs_dquot_initialize,
640 .drop = reiserfs_dquot_drop,
641 .alloc_space = dquot_alloc_space,
642 .alloc_inode = dquot_alloc_inode,
643 .free_space = dquot_free_space,
644 .free_inode = dquot_free_inode,
645 .transfer = dquot_transfer,
646 .write_dquot = reiserfs_write_dquot,
647 .acquire_dquot = reiserfs_acquire_dquot,
648 .release_dquot = reiserfs_release_dquot,
649 .mark_dirty = reiserfs_mark_dquot_dirty,
650 .write_info = reiserfs_write_info,
651 };
652
653 static struct quotactl_ops reiserfs_qctl_operations = {
654 .quota_on = reiserfs_quota_on,
655 .quota_off = vfs_quota_off,
656 .quota_sync = vfs_quota_sync,
657 .get_info = vfs_get_dqinfo,
658 .set_info = vfs_set_dqinfo,
659 .get_dqblk = vfs_get_dqblk,
660 .set_dqblk = vfs_set_dqblk,
661 };
662 #endif
663
664 static const struct export_operations reiserfs_export_ops = {
665 .encode_fh = reiserfs_encode_fh,
666 .fh_to_dentry = reiserfs_fh_to_dentry,
667 .fh_to_parent = reiserfs_fh_to_parent,
668 .get_parent = reiserfs_get_parent,
669 };
670
671 /* this struct is used in reiserfs_getopt () for containing the value for those
672 mount options that have values rather than being toggles. */
673 typedef struct {
674 char *value;
675 int setmask; /* bitmask which is to set on mount_options bitmask when this
676 value is found, 0 is no bits are to be changed. */
677 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
678 value is found, 0 is no bits are to be changed. This is
679 applied BEFORE setmask */
680 } arg_desc_t;
681
682 /* Set this bit in arg_required to allow empty arguments */
683 #define REISERFS_OPT_ALLOWEMPTY 31
684
685 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
686 mount options */
687 typedef struct {
688 char *option_name;
689 int arg_required; /* 0 if argument is not required, not 0 otherwise */
690 const arg_desc_t *values; /* list of values accepted by an option */
691 int setmask; /* bitmask which is to set on mount_options bitmask when this
692 value is found, 0 is no bits are to be changed. */
693 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
694 value is found, 0 is no bits are to be changed. This is
695 applied BEFORE setmask */
696 } opt_desc_t;
697
698 /* possible values for -o data= */
699 static const arg_desc_t logging_mode[] = {
700 {"ordered", 1 << REISERFS_DATA_ORDERED,
701 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
702 {"journal", 1 << REISERFS_DATA_LOG,
703 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
704 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
705 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
706 {.value = NULL}
707 };
708
709 /* possible values for -o barrier= */
710 static const arg_desc_t barrier_mode[] = {
711 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
712 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
713 {.value = NULL}
714 };
715
716 /* possible values for "-o block-allocator=" and bits which are to be set in
717 s_mount_opt of reiserfs specific part of in-core super block */
718 static const arg_desc_t balloc[] = {
719 {"noborder", 1 << REISERFS_NO_BORDER, 0},
720 {"border", 0, 1 << REISERFS_NO_BORDER},
721 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
722 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
723 {"test4", 1 << REISERFS_TEST4, 0},
724 {"notest4", 0, 1 << REISERFS_TEST4},
725 {NULL, 0, 0}
726 };
727
728 static const arg_desc_t tails[] = {
729 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
730 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
731 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
732 {NULL, 0, 0}
733 };
734
735 static const arg_desc_t error_actions[] = {
736 {"panic", 1 << REISERFS_ERROR_PANIC,
737 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
738 {"ro-remount", 1 << REISERFS_ERROR_RO,
739 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
740 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
741 {"continue", 1 << REISERFS_ERROR_CONTINUE,
742 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
743 #endif
744 {NULL, 0, 0},
745 };
746
747 /* proceed only one option from a list *cur - string containing of mount options
748 opts - array of options which are accepted
749 opt_arg - if option is found and requires an argument and if it is specifed
750 in the input - pointer to the argument is stored here
751 bit_flags - if option requires to set a certain bit - it is set here
752 return -1 if unknown option is found, opt->arg_required otherwise */
753 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
754 char **opt_arg, unsigned long *bit_flags)
755 {
756 char *p;
757 /* foo=bar,
758 ^ ^ ^
759 | | +-- option_end
760 | +-- arg_start
761 +-- option_start
762 */
763 const opt_desc_t *opt;
764 const arg_desc_t *arg;
765
766 p = *cur;
767
768 /* assume argument cannot contain commas */
769 *cur = strchr(p, ',');
770 if (*cur) {
771 *(*cur) = '\0';
772 (*cur)++;
773 }
774
775 if (!strncmp(p, "alloc=", 6)) {
776 /* Ugly special case, probably we should redo options parser so that
777 it can understand several arguments for some options, also so that
778 it can fill several bitfields with option values. */
779 if (reiserfs_parse_alloc_options(s, p + 6)) {
780 return -1;
781 } else {
782 return 0;
783 }
784 }
785
786 /* for every option in the list */
787 for (opt = opts; opt->option_name; opt++) {
788 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
789 if (bit_flags) {
790 if (opt->clrmask ==
791 (1 << REISERFS_UNSUPPORTED_OPT))
792 reiserfs_warning(s, "%s not supported.",
793 p);
794 else
795 *bit_flags &= ~opt->clrmask;
796 if (opt->setmask ==
797 (1 << REISERFS_UNSUPPORTED_OPT))
798 reiserfs_warning(s, "%s not supported.",
799 p);
800 else
801 *bit_flags |= opt->setmask;
802 }
803 break;
804 }
805 }
806 if (!opt->option_name) {
807 reiserfs_warning(s, "unknown mount option \"%s\"", p);
808 return -1;
809 }
810
811 p += strlen(opt->option_name);
812 switch (*p) {
813 case '=':
814 if (!opt->arg_required) {
815 reiserfs_warning(s,
816 "the option \"%s\" does not require an argument",
817 opt->option_name);
818 return -1;
819 }
820 break;
821
822 case 0:
823 if (opt->arg_required) {
824 reiserfs_warning(s,
825 "the option \"%s\" requires an argument",
826 opt->option_name);
827 return -1;
828 }
829 break;
830 default:
831 reiserfs_warning(s, "head of option \"%s\" is only correct",
832 opt->option_name);
833 return -1;
834 }
835
836 /* move to the argument, or to next option if argument is not required */
837 p++;
838
839 if (opt->arg_required
840 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
841 && !strlen(p)) {
842 /* this catches "option=," if not allowed */
843 reiserfs_warning(s, "empty argument for \"%s\"",
844 opt->option_name);
845 return -1;
846 }
847
848 if (!opt->values) {
849 /* *=NULLopt_arg contains pointer to argument */
850 *opt_arg = p;
851 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
852 }
853
854 /* values possible for this option are listed in opt->values */
855 for (arg = opt->values; arg->value; arg++) {
856 if (!strcmp(p, arg->value)) {
857 if (bit_flags) {
858 *bit_flags &= ~arg->clrmask;
859 *bit_flags |= arg->setmask;
860 }
861 return opt->arg_required;
862 }
863 }
864
865 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
866 opt->option_name);
867 return -1;
868 }
869
870 /* returns 0 if something is wrong in option string, 1 - otherwise */
871 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
872 unsigned long *mount_options,
873 /* after the parsing phase, contains the
874 collection of bitflags defining what
875 mount options were selected. */
876 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
877 char **jdev_name,
878 unsigned int *commit_max_age)
879 {
880 int c;
881 char *arg = NULL;
882 char *pos;
883 opt_desc_t opts[] = {
884 /* Compatibility stuff, so that -o notail for old setups still work */
885 {"tails",.arg_required = 't',.values = tails},
886 {"notail",.clrmask =
887 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
888 {"conv",.setmask = 1 << REISERFS_CONVERT},
889 {"attrs",.setmask = 1 << REISERFS_ATTRS},
890 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
891 #ifdef CONFIG_REISERFS_FS_XATTR
892 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
893 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
894 #else
895 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
896 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
897 #endif
898 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
899 {"acl",.setmask = 1 << REISERFS_POSIXACL},
900 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
901 #else
902 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
903 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
904 #endif
905 {.option_name = "nolog"},
906 {"replayonly",.setmask = 1 << REPLAYONLY},
907 {"block-allocator",.arg_required = 'a',.values = balloc},
908 {"data",.arg_required = 'd',.values = logging_mode},
909 {"barrier",.arg_required = 'b',.values = barrier_mode},
910 {"resize",.arg_required = 'r',.values = NULL},
911 {"jdev",.arg_required = 'j',.values = NULL},
912 {"nolargeio",.arg_required = 'w',.values = NULL},
913 {"commit",.arg_required = 'c',.values = NULL},
914 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
915 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
916 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
917 {"errors",.arg_required = 'e',.values = error_actions},
918 {"usrjquota",.arg_required =
919 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
920 {"grpjquota",.arg_required =
921 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
922 {"jqfmt",.arg_required = 'f',.values = NULL},
923 {.option_name = NULL}
924 };
925
926 *blocks = 0;
927 if (!options || !*options)
928 /* use default configuration: create tails, journaling on, no
929 conversion to newest format */
930 return 1;
931
932 for (pos = options; pos;) {
933 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
934 if (c == -1)
935 /* wrong option is given */
936 return 0;
937
938 if (c == 'r') {
939 char *p;
940
941 p = NULL;
942 /* "resize=NNN" or "resize=auto" */
943
944 if (!strcmp(arg, "auto")) {
945 /* From JFS code, to auto-get the size. */
946 *blocks =
947 s->s_bdev->bd_inode->i_size >> s->
948 s_blocksize_bits;
949 } else {
950 *blocks = simple_strtoul(arg, &p, 0);
951 if (*p != '\0') {
952 /* NNN does not look like a number */
953 reiserfs_warning(s,
954 "reiserfs_parse_options: bad value %s",
955 arg);
956 return 0;
957 }
958 }
959 }
960
961 if (c == 'c') {
962 char *p = NULL;
963 unsigned long val = simple_strtoul(arg, &p, 0);
964 /* commit=NNN (time in seconds) */
965 if (*p != '\0' || val >= (unsigned int)-1) {
966 reiserfs_warning(s,
967 "reiserfs_parse_options: bad value %s",
968 arg);
969 return 0;
970 }
971 *commit_max_age = (unsigned int)val;
972 }
973
974 if (c == 'w') {
975 reiserfs_warning(s, "reiserfs: nolargeio option is no longer supported");
976 return 0;
977 }
978
979 if (c == 'j') {
980 if (arg && *arg && jdev_name) {
981 if (*jdev_name) { //Hm, already assigned?
982 reiserfs_warning(s,
983 "reiserfs_parse_options: journal device was already specified to be %s",
984 *jdev_name);
985 return 0;
986 }
987 *jdev_name = arg;
988 }
989 }
990 #ifdef CONFIG_QUOTA
991 if (c == 'u' || c == 'g') {
992 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
993
994 if (sb_any_quota_enabled(s)) {
995 reiserfs_warning(s,
996 "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
997 return 0;
998 }
999 if (*arg) { /* Some filename specified? */
1000 if (REISERFS_SB(s)->s_qf_names[qtype]
1001 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1002 arg)) {
1003 reiserfs_warning(s,
1004 "reiserfs_parse_options: %s quota file already specified.",
1005 QTYPE2NAME(qtype));
1006 return 0;
1007 }
1008 if (strchr(arg, '/')) {
1009 reiserfs_warning(s,
1010 "reiserfs_parse_options: quotafile must be on filesystem root.");
1011 return 0;
1012 }
1013 REISERFS_SB(s)->s_qf_names[qtype] =
1014 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1015 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1016 reiserfs_warning(s,
1017 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1018 return 0;
1019 }
1020 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1021 *mount_options |= 1 << REISERFS_QUOTA;
1022 } else {
1023 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1024 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1025 }
1026 }
1027 if (c == 'f') {
1028 if (!strcmp(arg, "vfsold"))
1029 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1030 else if (!strcmp(arg, "vfsv0"))
1031 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1032 else {
1033 reiserfs_warning(s,
1034 "reiserfs_parse_options: unknown quota format specified.");
1035 return 0;
1036 }
1037 }
1038 #else
1039 if (c == 'u' || c == 'g' || c == 'f') {
1040 reiserfs_warning(s,
1041 "reiserfs_parse_options: journalled quota options not supported.");
1042 return 0;
1043 }
1044 #endif
1045 }
1046
1047 #ifdef CONFIG_QUOTA
1048 if (!REISERFS_SB(s)->s_jquota_fmt
1049 && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1050 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1051 reiserfs_warning(s,
1052 "reiserfs_parse_options: journalled quota format not specified.");
1053 return 0;
1054 }
1055 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1056 if (!(*mount_options & (1 << REISERFS_QUOTA))
1057 && sb_any_quota_enabled(s)) {
1058 reiserfs_warning(s,
1059 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1060 return 0;
1061 }
1062 #endif
1063
1064 return 1;
1065 }
1066
1067 static void switch_data_mode(struct super_block *s, unsigned long mode)
1068 {
1069 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1070 (1 << REISERFS_DATA_ORDERED) |
1071 (1 << REISERFS_DATA_WRITEBACK));
1072 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1073 }
1074
1075 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1076 {
1077 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1078 if (!reiserfs_data_log(s)) {
1079 switch_data_mode(s, REISERFS_DATA_LOG);
1080 reiserfs_info(s, "switching to journaled data mode\n");
1081 }
1082 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1083 if (!reiserfs_data_ordered(s)) {
1084 switch_data_mode(s, REISERFS_DATA_ORDERED);
1085 reiserfs_info(s, "switching to ordered data mode\n");
1086 }
1087 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1088 if (!reiserfs_data_writeback(s)) {
1089 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1090 reiserfs_info(s, "switching to writeback data mode\n");
1091 }
1092 }
1093 }
1094
1095 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1096 {
1097 int flush = (1 << REISERFS_BARRIER_FLUSH);
1098 int none = (1 << REISERFS_BARRIER_NONE);
1099 int all_barrier = flush | none;
1100
1101 if (bits & all_barrier) {
1102 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1103 if (bits & flush) {
1104 REISERFS_SB(s)->s_mount_opt |= flush;
1105 printk("reiserfs: enabling write barrier flush mode\n");
1106 } else if (bits & none) {
1107 REISERFS_SB(s)->s_mount_opt |= none;
1108 printk("reiserfs: write barriers turned off\n");
1109 }
1110 }
1111 }
1112
1113 static void handle_attrs(struct super_block *s)
1114 {
1115 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1116
1117 if (reiserfs_attrs(s)) {
1118 if (old_format_only(s)) {
1119 reiserfs_warning(s,
1120 "reiserfs: cannot support attributes on 3.5.x disk format");
1121 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1122 return;
1123 }
1124 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1125 reiserfs_warning(s,
1126 "reiserfs: cannot support attributes until flag is set in super-block");
1127 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1128 }
1129 }
1130 }
1131
1132 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1133 {
1134 struct reiserfs_super_block *rs;
1135 struct reiserfs_transaction_handle th;
1136 unsigned long blocks;
1137 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1138 unsigned long safe_mask = 0;
1139 unsigned int commit_max_age = (unsigned int)-1;
1140 struct reiserfs_journal *journal = SB_JOURNAL(s);
1141 int err;
1142 #ifdef CONFIG_QUOTA
1143 int i;
1144 #endif
1145
1146 rs = SB_DISK_SUPER_BLOCK(s);
1147
1148 if (!reiserfs_parse_options
1149 (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1150 #ifdef CONFIG_QUOTA
1151 for (i = 0; i < MAXQUOTAS; i++) {
1152 kfree(REISERFS_SB(s)->s_qf_names[i]);
1153 REISERFS_SB(s)->s_qf_names[i] = NULL;
1154 }
1155 #endif
1156 return -EINVAL;
1157 }
1158
1159 handle_attrs(s);
1160
1161 /* Add options that are safe here */
1162 safe_mask |= 1 << REISERFS_SMALLTAIL;
1163 safe_mask |= 1 << REISERFS_LARGETAIL;
1164 safe_mask |= 1 << REISERFS_NO_BORDER;
1165 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1166 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1167 safe_mask |= 1 << REISERFS_TEST4;
1168 safe_mask |= 1 << REISERFS_ATTRS;
1169 safe_mask |= 1 << REISERFS_XATTRS_USER;
1170 safe_mask |= 1 << REISERFS_POSIXACL;
1171 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1172 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1173 safe_mask |= 1 << REISERFS_ERROR_RO;
1174 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1175 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1176 safe_mask |= 1 << REISERFS_QUOTA;
1177
1178 /* Update the bitmask, taking care to keep
1179 * the bits we're not allowed to change here */
1180 REISERFS_SB(s)->s_mount_opt =
1181 (REISERFS_SB(s)->
1182 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1183
1184 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1185 journal->j_max_commit_age = commit_max_age;
1186 journal->j_max_trans_age = commit_max_age;
1187 } else if (commit_max_age == 0) {
1188 /* 0 means restore defaults. */
1189 journal->j_max_commit_age = journal->j_default_max_commit_age;
1190 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1191 }
1192
1193 if (blocks) {
1194 int rc = reiserfs_resize(s, blocks);
1195 if (rc != 0)
1196 return rc;
1197 }
1198
1199 if (*mount_flags & MS_RDONLY) {
1200 reiserfs_xattr_init(s, *mount_flags);
1201 /* remount read-only */
1202 if (s->s_flags & MS_RDONLY)
1203 /* it is read-only already */
1204 return 0;
1205 /* try to remount file system with read-only permissions */
1206 if (sb_umount_state(rs) == REISERFS_VALID_FS
1207 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1208 return 0;
1209 }
1210
1211 err = journal_begin(&th, s, 10);
1212 if (err)
1213 return err;
1214
1215 /* Mounting a rw partition read-only. */
1216 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1217 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1218 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1219 } else {
1220 /* remount read-write */
1221 if (!(s->s_flags & MS_RDONLY)) {
1222 reiserfs_xattr_init(s, *mount_flags);
1223 return 0; /* We are read-write already */
1224 }
1225
1226 if (reiserfs_is_journal_aborted(journal))
1227 return journal->j_errno;
1228
1229 handle_data_mode(s, mount_options);
1230 handle_barrier_mode(s, mount_options);
1231 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1232 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1233 err = journal_begin(&th, s, 10);
1234 if (err)
1235 return err;
1236
1237 /* Mount a partition which is read-only, read-write */
1238 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1239 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1240 s->s_flags &= ~MS_RDONLY;
1241 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1242 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1243 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1244 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1245 }
1246 /* this will force a full flush of all journal lists */
1247 SB_JOURNAL(s)->j_must_wait = 1;
1248 err = journal_end(&th, s, 10);
1249 if (err)
1250 return err;
1251 s->s_dirt = 0;
1252
1253 if (!(*mount_flags & MS_RDONLY)) {
1254 finish_unfinished(s);
1255 reiserfs_xattr_init(s, *mount_flags);
1256 }
1257
1258 return 0;
1259 }
1260
1261 static int read_super_block(struct super_block *s, int offset)
1262 {
1263 struct buffer_head *bh;
1264 struct reiserfs_super_block *rs;
1265 int fs_blocksize;
1266
1267 bh = sb_bread(s, offset / s->s_blocksize);
1268 if (!bh) {
1269 reiserfs_warning(s, "sh-2006: read_super_block: "
1270 "bread failed (dev %s, block %lu, size %lu)",
1271 reiserfs_bdevname(s), offset / s->s_blocksize,
1272 s->s_blocksize);
1273 return 1;
1274 }
1275
1276 rs = (struct reiserfs_super_block *)bh->b_data;
1277 if (!is_any_reiserfs_magic_string(rs)) {
1278 brelse(bh);
1279 return 1;
1280 }
1281 //
1282 // ok, reiserfs signature (old or new) found in at the given offset
1283 //
1284 fs_blocksize = sb_blocksize(rs);
1285 brelse(bh);
1286 sb_set_blocksize(s, fs_blocksize);
1287
1288 bh = sb_bread(s, offset / s->s_blocksize);
1289 if (!bh) {
1290 reiserfs_warning(s, "sh-2007: read_super_block: "
1291 "bread failed (dev %s, block %lu, size %lu)\n",
1292 reiserfs_bdevname(s), offset / s->s_blocksize,
1293 s->s_blocksize);
1294 return 1;
1295 }
1296
1297 rs = (struct reiserfs_super_block *)bh->b_data;
1298 if (sb_blocksize(rs) != s->s_blocksize) {
1299 reiserfs_warning(s, "sh-2011: read_super_block: "
1300 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1301 reiserfs_bdevname(s),
1302 (unsigned long long)bh->b_blocknr,
1303 s->s_blocksize);
1304 brelse(bh);
1305 return 1;
1306 }
1307
1308 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1309 brelse(bh);
1310 reiserfs_warning(s,
1311 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1312 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1313 "get newer reiserfsprogs package");
1314 return 1;
1315 }
1316
1317 SB_BUFFER_WITH_SB(s) = bh;
1318 SB_DISK_SUPER_BLOCK(s) = rs;
1319
1320 if (is_reiserfs_jr(rs)) {
1321 /* magic is of non-standard journal filesystem, look at s_version to
1322 find which format is in use */
1323 if (sb_version(rs) == REISERFS_VERSION_2)
1324 reiserfs_warning(s,
1325 "read_super_block: found reiserfs format \"3.6\""
1326 " with non-standard journal");
1327 else if (sb_version(rs) == REISERFS_VERSION_1)
1328 reiserfs_warning(s,
1329 "read_super_block: found reiserfs format \"3.5\""
1330 " with non-standard journal");
1331 else {
1332 reiserfs_warning(s,
1333 "sh-2012: read_super_block: found unknown "
1334 "format \"%u\" of reiserfs with non-standard magic",
1335 sb_version(rs));
1336 return 1;
1337 }
1338 } else
1339 /* s_version of standard format may contain incorrect information,
1340 so we just look at the magic string */
1341 reiserfs_info(s,
1342 "found reiserfs format \"%s\" with standard journal\n",
1343 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1344
1345 s->s_op = &reiserfs_sops;
1346 s->s_export_op = &reiserfs_export_ops;
1347 #ifdef CONFIG_QUOTA
1348 s->s_qcop = &reiserfs_qctl_operations;
1349 s->dq_op = &reiserfs_quota_operations;
1350 #endif
1351
1352 /* new format is limited by the 32 bit wide i_blocks field, want to
1353 ** be one full block below that.
1354 */
1355 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1356 return 0;
1357 }
1358
1359 /* after journal replay, reread all bitmap and super blocks */
1360 static int reread_meta_blocks(struct super_block *s)
1361 {
1362 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1363 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1364 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1365 reiserfs_warning(s,
1366 "reread_meta_blocks, error reading the super");
1367 return 1;
1368 }
1369
1370 return 0;
1371 }
1372
1373 /////////////////////////////////////////////////////
1374 // hash detection stuff
1375
1376 // if root directory is empty - we set default - Yura's - hash and
1377 // warn about it
1378 // FIXME: we look for only one name in a directory. If tea and yura
1379 // bith have the same value - we ask user to send report to the
1380 // mailing list
1381 static __u32 find_hash_out(struct super_block *s)
1382 {
1383 int retval;
1384 struct inode *inode;
1385 struct cpu_key key;
1386 INITIALIZE_PATH(path);
1387 struct reiserfs_dir_entry de;
1388 __u32 hash = DEFAULT_HASH;
1389
1390 inode = s->s_root->d_inode;
1391
1392 do { // Some serious "goto"-hater was there ;)
1393 u32 teahash, r5hash, yurahash;
1394
1395 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1396 retval = search_by_entry_key(s, &key, &path, &de);
1397 if (retval == IO_ERROR) {
1398 pathrelse(&path);
1399 return UNSET_HASH;
1400 }
1401 if (retval == NAME_NOT_FOUND)
1402 de.de_entry_num--;
1403 set_de_name_and_namelen(&de);
1404 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1405 /* allow override in this case */
1406 if (reiserfs_rupasov_hash(s)) {
1407 hash = YURA_HASH;
1408 }
1409 reiserfs_warning(s, "FS seems to be empty, autodetect "
1410 "is using the default hash");
1411 break;
1412 }
1413 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1414 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1415 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1416 if (((teahash == r5hash)
1417 &&
1418 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1419 == r5hash)) || ((teahash == yurahash)
1420 && (yurahash ==
1421 GET_HASH_VALUE(deh_offset
1422 (&
1423 (de.
1424 de_deh[de.
1425 de_entry_num])))))
1426 || ((r5hash == yurahash)
1427 && (yurahash ==
1428 GET_HASH_VALUE(deh_offset
1429 (&(de.de_deh[de.de_entry_num])))))) {
1430 reiserfs_warning(s,
1431 "Unable to automatically detect hash function. "
1432 "Please mount with -o hash={tea,rupasov,r5}",
1433 reiserfs_bdevname(s));
1434 hash = UNSET_HASH;
1435 break;
1436 }
1437 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1438 yurahash)
1439 hash = YURA_HASH;
1440 else if (GET_HASH_VALUE
1441 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1442 hash = TEA_HASH;
1443 else if (GET_HASH_VALUE
1444 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1445 hash = R5_HASH;
1446 else {
1447 reiserfs_warning(s, "Unrecognised hash function");
1448 hash = UNSET_HASH;
1449 }
1450 } while (0);
1451
1452 pathrelse(&path);
1453 return hash;
1454 }
1455
1456 // finds out which hash names are sorted with
1457 static int what_hash(struct super_block *s)
1458 {
1459 __u32 code;
1460
1461 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1462
1463 /* reiserfs_hash_detect() == true if any of the hash mount options
1464 ** were used. We must check them to make sure the user isn't
1465 ** using a bad hash value
1466 */
1467 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1468 code = find_hash_out(s);
1469
1470 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1471 /* detection has found the hash, and we must check against the
1472 ** mount options
1473 */
1474 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1475 reiserfs_warning(s, "Error, %s hash detected, "
1476 "unable to force rupasov hash",
1477 reiserfs_hashname(code));
1478 code = UNSET_HASH;
1479 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1480 reiserfs_warning(s, "Error, %s hash detected, "
1481 "unable to force tea hash",
1482 reiserfs_hashname(code));
1483 code = UNSET_HASH;
1484 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1485 reiserfs_warning(s, "Error, %s hash detected, "
1486 "unable to force r5 hash",
1487 reiserfs_hashname(code));
1488 code = UNSET_HASH;
1489 }
1490 } else {
1491 /* find_hash_out was not called or could not determine the hash */
1492 if (reiserfs_rupasov_hash(s)) {
1493 code = YURA_HASH;
1494 } else if (reiserfs_tea_hash(s)) {
1495 code = TEA_HASH;
1496 } else if (reiserfs_r5_hash(s)) {
1497 code = R5_HASH;
1498 }
1499 }
1500
1501 /* if we are mounted RW, and we have a new valid hash code, update
1502 ** the super
1503 */
1504 if (code != UNSET_HASH &&
1505 !(s->s_flags & MS_RDONLY) &&
1506 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1507 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1508 }
1509 return code;
1510 }
1511
1512 // return pointer to appropriate function
1513 static hashf_t hash_function(struct super_block *s)
1514 {
1515 switch (what_hash(s)) {
1516 case TEA_HASH:
1517 reiserfs_info(s, "Using tea hash to sort names\n");
1518 return keyed_hash;
1519 case YURA_HASH:
1520 reiserfs_info(s, "Using rupasov hash to sort names\n");
1521 return yura_hash;
1522 case R5_HASH:
1523 reiserfs_info(s, "Using r5 hash to sort names\n");
1524 return r5_hash;
1525 }
1526 return NULL;
1527 }
1528
1529 // this is used to set up correct value for old partitions
1530 static int function2code(hashf_t func)
1531 {
1532 if (func == keyed_hash)
1533 return TEA_HASH;
1534 if (func == yura_hash)
1535 return YURA_HASH;
1536 if (func == r5_hash)
1537 return R5_HASH;
1538
1539 BUG(); // should never happen
1540
1541 return 0;
1542 }
1543
1544 #define SWARN(silent, s, ...) \
1545 if (!(silent)) \
1546 reiserfs_warning (s, __VA_ARGS__)
1547
1548 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1549 {
1550 struct inode *root_inode;
1551 struct reiserfs_transaction_handle th;
1552 int old_format = 0;
1553 unsigned long blocks;
1554 unsigned int commit_max_age = 0;
1555 int jinit_done = 0;
1556 struct reiserfs_iget_args args;
1557 struct reiserfs_super_block *rs;
1558 char *jdev_name;
1559 struct reiserfs_sb_info *sbi;
1560 int errval = -EINVAL;
1561
1562 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1563 if (!sbi) {
1564 errval = -ENOMEM;
1565 goto error;
1566 }
1567 s->s_fs_info = sbi;
1568 /* Set default values for options: non-aggressive tails, RO on errors */
1569 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1570 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1571 /* no preallocation minimum, be smart in
1572 reiserfs_file_write instead */
1573 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1574 /* Preallocate by 16 blocks (17-1) at once */
1575 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1576 #ifdef CONFIG_REISERFS_FS_XATTR
1577 /* Initialize the rwsem for xattr dir */
1578 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1579 #endif
1580 /* setup default block allocator options */
1581 reiserfs_init_alloc_options(s);
1582
1583 jdev_name = NULL;
1584 if (reiserfs_parse_options
1585 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1586 &commit_max_age) == 0) {
1587 goto error;
1588 }
1589
1590 if (blocks) {
1591 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1592 "for remount only");
1593 goto error;
1594 }
1595
1596 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1597 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1598 old_format = 1;
1599 /* try new format (64-th 1k block), which can contain reiserfs super block */
1600 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1601 SWARN(silent, s,
1602 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1603 reiserfs_bdevname(s));
1604 goto error;
1605 }
1606
1607 rs = SB_DISK_SUPER_BLOCK(s);
1608 /* Let's do basic sanity check to verify that underlying device is not
1609 smaller than the filesystem. If the check fails then abort and scream,
1610 because bad stuff will happen otherwise. */
1611 if (s->s_bdev && s->s_bdev->bd_inode
1612 && i_size_read(s->s_bdev->bd_inode) <
1613 sb_block_count(rs) * sb_blocksize(rs)) {
1614 SWARN(silent, s,
1615 "Filesystem on %s cannot be mounted because it is bigger than the device",
1616 reiserfs_bdevname(s));
1617 SWARN(silent, s,
1618 "You may need to run fsck or increase size of your LVM partition");
1619 SWARN(silent, s,
1620 "Or may be you forgot to reboot after fdisk when it told you to");
1621 goto error;
1622 }
1623
1624 sbi->s_mount_state = SB_REISERFS_STATE(s);
1625 sbi->s_mount_state = REISERFS_VALID_FS;
1626
1627 if ((errval = reiserfs_init_bitmap_cache(s))) {
1628 SWARN(silent, s,
1629 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1630 goto error;
1631 }
1632 errval = -EINVAL;
1633 #ifdef CONFIG_REISERFS_CHECK
1634 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1635 SWARN(silent, s, "- it is slow mode for debugging.");
1636 #endif
1637
1638 /* make data=ordered the default */
1639 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1640 !reiserfs_data_writeback(s)) {
1641 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1642 }
1643
1644 if (reiserfs_data_log(s)) {
1645 reiserfs_info(s, "using journaled data mode\n");
1646 } else if (reiserfs_data_ordered(s)) {
1647 reiserfs_info(s, "using ordered data mode\n");
1648 } else {
1649 reiserfs_info(s, "using writeback data mode\n");
1650 }
1651 if (reiserfs_barrier_flush(s)) {
1652 printk("reiserfs: using flush barriers\n");
1653 }
1654 // set_device_ro(s->s_dev, 1) ;
1655 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1656 SWARN(silent, s,
1657 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1658 goto error;
1659 } else {
1660 jinit_done = 1; /* once this is set, journal_release must be called
1661 ** if we error out of the mount
1662 */
1663 }
1664 if (reread_meta_blocks(s)) {
1665 SWARN(silent, s,
1666 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1667 goto error;
1668 }
1669
1670 if (replay_only(s))
1671 goto error;
1672
1673 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1674 SWARN(silent, s,
1675 "clm-7000: Detected readonly device, marking FS readonly");
1676 s->s_flags |= MS_RDONLY;
1677 }
1678 args.objectid = REISERFS_ROOT_OBJECTID;
1679 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1680 root_inode =
1681 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1682 reiserfs_init_locked_inode, (void *)(&args));
1683 if (!root_inode) {
1684 SWARN(silent, s,
1685 "jmacd-10: reiserfs_fill_super: get root inode failed");
1686 goto error;
1687 }
1688
1689 if (root_inode->i_state & I_NEW) {
1690 reiserfs_read_locked_inode(root_inode, &args);
1691 unlock_new_inode(root_inode);
1692 }
1693
1694 s->s_root = d_alloc_root(root_inode);
1695 if (!s->s_root) {
1696 iput(root_inode);
1697 goto error;
1698 }
1699 // define and initialize hash function
1700 sbi->s_hash_function = hash_function(s);
1701 if (sbi->s_hash_function == NULL) {
1702 dput(s->s_root);
1703 s->s_root = NULL;
1704 goto error;
1705 }
1706
1707 if (is_reiserfs_3_5(rs)
1708 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1709 set_bit(REISERFS_3_5, &(sbi->s_properties));
1710 else if (old_format)
1711 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1712 else
1713 set_bit(REISERFS_3_6, &(sbi->s_properties));
1714
1715 if (!(s->s_flags & MS_RDONLY)) {
1716
1717 errval = journal_begin(&th, s, 1);
1718 if (errval) {
1719 dput(s->s_root);
1720 s->s_root = NULL;
1721 goto error;
1722 }
1723 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1724
1725 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1726 set_sb_fs_state(rs, 0);
1727
1728 /* Clear out s_bmap_nr if it would wrap. We can handle this
1729 * case, but older revisions can't. This will cause the
1730 * file system to fail mount on those older implementations,
1731 * avoiding corruption. -jeffm */
1732 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1733 sb_bmap_nr(rs) != 0) {
1734 reiserfs_warning(s, "super-2030: This file system "
1735 "claims to use %u bitmap blocks in "
1736 "its super block, but requires %u. "
1737 "Clearing to zero.", sb_bmap_nr(rs),
1738 reiserfs_bmap_count(s));
1739
1740 set_sb_bmap_nr(rs, 0);
1741 }
1742
1743 if (old_format_only(s)) {
1744 /* filesystem of format 3.5 either with standard or non-standard
1745 journal */
1746 if (convert_reiserfs(s)) {
1747 /* and -o conv is given */
1748 if (!silent)
1749 reiserfs_info(s,
1750 "converting 3.5 filesystem to the 3.6 format");
1751
1752 if (is_reiserfs_3_5(rs))
1753 /* put magic string of 3.6 format. 2.2 will not be able to
1754 mount this filesystem anymore */
1755 memcpy(rs->s_v1.s_magic,
1756 reiserfs_3_6_magic_string,
1757 sizeof
1758 (reiserfs_3_6_magic_string));
1759
1760 set_sb_version(rs, REISERFS_VERSION_2);
1761 reiserfs_convert_objectid_map_v1(s);
1762 set_bit(REISERFS_3_6, &(sbi->s_properties));
1763 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1764 } else if (!silent) {
1765 reiserfs_info(s, "using 3.5.x disk format\n");
1766 }
1767 }
1768
1769 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1770 errval = journal_end(&th, s, 1);
1771 if (errval) {
1772 dput(s->s_root);
1773 s->s_root = NULL;
1774 goto error;
1775 }
1776
1777 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1778 dput(s->s_root);
1779 s->s_root = NULL;
1780 goto error;
1781 }
1782
1783 /* look for files which were to be removed in previous session */
1784 finish_unfinished(s);
1785 } else {
1786 if (old_format_only(s) && !silent) {
1787 reiserfs_info(s, "using 3.5.x disk format\n");
1788 }
1789
1790 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1791 dput(s->s_root);
1792 s->s_root = NULL;
1793 goto error;
1794 }
1795 }
1796 // mark hash in super block: it could be unset. overwrite should be ok
1797 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1798
1799 handle_attrs(s);
1800
1801 reiserfs_proc_info_init(s);
1802
1803 init_waitqueue_head(&(sbi->s_wait));
1804 spin_lock_init(&sbi->bitmap_lock);
1805
1806 return (0);
1807
1808 error:
1809 if (jinit_done) { /* kill the commit thread, free journal ram */
1810 journal_release_error(NULL, s);
1811 }
1812
1813 reiserfs_free_bitmap_cache(s);
1814 if (SB_BUFFER_WITH_SB(s))
1815 brelse(SB_BUFFER_WITH_SB(s));
1816 #ifdef CONFIG_QUOTA
1817 {
1818 int j;
1819 for (j = 0; j < MAXQUOTAS; j++) {
1820 kfree(sbi->s_qf_names[j]);
1821 sbi->s_qf_names[j] = NULL;
1822 }
1823 }
1824 #endif
1825 kfree(sbi);
1826
1827 s->s_fs_info = NULL;
1828 return errval;
1829 }
1830
1831 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1832 {
1833 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1834
1835 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1836 buf->f_bfree = sb_free_blocks(rs);
1837 buf->f_bavail = buf->f_bfree;
1838 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1839 buf->f_bsize = dentry->d_sb->s_blocksize;
1840 /* changed to accommodate gcc folks. */
1841 buf->f_type = REISERFS_SUPER_MAGIC;
1842 return 0;
1843 }
1844
1845 #ifdef CONFIG_QUOTA
1846 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1847 {
1848 struct reiserfs_transaction_handle th;
1849 int ret, err;
1850
1851 /* We may create quota structure so we need to reserve enough blocks */
1852 reiserfs_write_lock(inode->i_sb);
1853 ret =
1854 journal_begin(&th, inode->i_sb,
1855 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1856 if (ret)
1857 goto out;
1858 ret = dquot_initialize(inode, type);
1859 err =
1860 journal_end(&th, inode->i_sb,
1861 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1862 if (!ret && err)
1863 ret = err;
1864 out:
1865 reiserfs_write_unlock(inode->i_sb);
1866 return ret;
1867 }
1868
1869 static int reiserfs_dquot_drop(struct inode *inode)
1870 {
1871 struct reiserfs_transaction_handle th;
1872 int ret, err;
1873
1874 /* We may delete quota structure so we need to reserve enough blocks */
1875 reiserfs_write_lock(inode->i_sb);
1876 ret =
1877 journal_begin(&th, inode->i_sb,
1878 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1879 if (ret)
1880 goto out;
1881 ret = dquot_drop(inode);
1882 err =
1883 journal_end(&th, inode->i_sb,
1884 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1885 if (!ret && err)
1886 ret = err;
1887 out:
1888 reiserfs_write_unlock(inode->i_sb);
1889 return ret;
1890 }
1891
1892 static int reiserfs_write_dquot(struct dquot *dquot)
1893 {
1894 struct reiserfs_transaction_handle th;
1895 int ret, err;
1896
1897 reiserfs_write_lock(dquot->dq_sb);
1898 ret =
1899 journal_begin(&th, dquot->dq_sb,
1900 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1901 if (ret)
1902 goto out;
1903 ret = dquot_commit(dquot);
1904 err =
1905 journal_end(&th, dquot->dq_sb,
1906 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1907 if (!ret && err)
1908 ret = err;
1909 out:
1910 reiserfs_write_unlock(dquot->dq_sb);
1911 return ret;
1912 }
1913
1914 static int reiserfs_acquire_dquot(struct dquot *dquot)
1915 {
1916 struct reiserfs_transaction_handle th;
1917 int ret, err;
1918
1919 reiserfs_write_lock(dquot->dq_sb);
1920 ret =
1921 journal_begin(&th, dquot->dq_sb,
1922 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1923 if (ret)
1924 goto out;
1925 ret = dquot_acquire(dquot);
1926 err =
1927 journal_end(&th, dquot->dq_sb,
1928 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1929 if (!ret && err)
1930 ret = err;
1931 out:
1932 reiserfs_write_unlock(dquot->dq_sb);
1933 return ret;
1934 }
1935
1936 static int reiserfs_release_dquot(struct dquot *dquot)
1937 {
1938 struct reiserfs_transaction_handle th;
1939 int ret, err;
1940
1941 reiserfs_write_lock(dquot->dq_sb);
1942 ret =
1943 journal_begin(&th, dquot->dq_sb,
1944 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1945 if (ret) {
1946 /* Release dquot anyway to avoid endless cycle in dqput() */
1947 dquot_release(dquot);
1948 goto out;
1949 }
1950 ret = dquot_release(dquot);
1951 err =
1952 journal_end(&th, dquot->dq_sb,
1953 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1954 if (!ret && err)
1955 ret = err;
1956 out:
1957 reiserfs_write_unlock(dquot->dq_sb);
1958 return ret;
1959 }
1960
1961 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1962 {
1963 /* Are we journalling quotas? */
1964 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1965 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1966 dquot_mark_dquot_dirty(dquot);
1967 return reiserfs_write_dquot(dquot);
1968 } else
1969 return dquot_mark_dquot_dirty(dquot);
1970 }
1971
1972 static int reiserfs_write_info(struct super_block *sb, int type)
1973 {
1974 struct reiserfs_transaction_handle th;
1975 int ret, err;
1976
1977 /* Data block + inode block */
1978 reiserfs_write_lock(sb);
1979 ret = journal_begin(&th, sb, 2);
1980 if (ret)
1981 goto out;
1982 ret = dquot_commit_info(sb, type);
1983 err = journal_end(&th, sb, 2);
1984 if (!ret && err)
1985 ret = err;
1986 out:
1987 reiserfs_write_unlock(sb);
1988 return ret;
1989 }
1990
1991 /*
1992 * Turn on quotas during mount time - we need to find the quota file and such...
1993 */
1994 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
1995 {
1996 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
1997 REISERFS_SB(sb)->s_jquota_fmt, type);
1998 }
1999
2000 /*
2001 * Standard function to be called on quota_on
2002 */
2003 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2004 char *path)
2005 {
2006 int err;
2007 struct nameidata nd;
2008
2009 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2010 return -EINVAL;
2011 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2012 if (err)
2013 return err;
2014 /* Quotafile not on the same filesystem? */
2015 if (nd.mnt->mnt_sb != sb) {
2016 path_release(&nd);
2017 return -EXDEV;
2018 }
2019 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2020 if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
2021 reiserfs_warning(sb,
2022 "reiserfs: Quota file must have tail packing disabled.");
2023 path_release(&nd);
2024 return -EINVAL;
2025 }
2026 /* Not journalling quota? No more tests needed... */
2027 if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2028 !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2029 path_release(&nd);
2030 return vfs_quota_on(sb, type, format_id, path);
2031 }
2032 /* Quotafile not of fs root? */
2033 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2034 reiserfs_warning(sb,
2035 "reiserfs: Quota file not on filesystem root. "
2036 "Journalled quota will not work.");
2037 path_release(&nd);
2038 return vfs_quota_on(sb, type, format_id, path);
2039 }
2040
2041 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2042 * acquiring the locks... As quota files are never truncated and quota code
2043 * itself serializes the operations (and noone else should touch the files)
2044 * we don't have to be afraid of races */
2045 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2046 size_t len, loff_t off)
2047 {
2048 struct inode *inode = sb_dqopt(sb)->files[type];
2049 unsigned long blk = off >> sb->s_blocksize_bits;
2050 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2051 size_t toread;
2052 struct buffer_head tmp_bh, *bh;
2053 loff_t i_size = i_size_read(inode);
2054
2055 if (off > i_size)
2056 return 0;
2057 if (off + len > i_size)
2058 len = i_size - off;
2059 toread = len;
2060 while (toread > 0) {
2061 tocopy =
2062 sb->s_blocksize - offset <
2063 toread ? sb->s_blocksize - offset : toread;
2064 tmp_bh.b_state = 0;
2065 /* Quota files are without tails so we can safely use this function */
2066 reiserfs_write_lock(sb);
2067 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2068 reiserfs_write_unlock(sb);
2069 if (err)
2070 return err;
2071 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2072 memset(data, 0, tocopy);
2073 else {
2074 bh = sb_bread(sb, tmp_bh.b_blocknr);
2075 if (!bh)
2076 return -EIO;
2077 memcpy(data, bh->b_data + offset, tocopy);
2078 brelse(bh);
2079 }
2080 offset = 0;
2081 toread -= tocopy;
2082 data += tocopy;
2083 blk++;
2084 }
2085 return len;
2086 }
2087
2088 /* Write to quotafile (we know the transaction is already started and has
2089 * enough credits) */
2090 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2091 const char *data, size_t len, loff_t off)
2092 {
2093 struct inode *inode = sb_dqopt(sb)->files[type];
2094 unsigned long blk = off >> sb->s_blocksize_bits;
2095 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2096 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2097 size_t towrite = len;
2098 struct buffer_head tmp_bh, *bh;
2099
2100 if (!current->journal_info) {
2101 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2102 " cancelled because transaction is not started.\n",
2103 (unsigned long long)off, (unsigned long long)len);
2104 return -EIO;
2105 }
2106 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2107 while (towrite > 0) {
2108 tocopy = sb->s_blocksize - offset < towrite ?
2109 sb->s_blocksize - offset : towrite;
2110 tmp_bh.b_state = 0;
2111 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2112 if (err)
2113 goto out;
2114 if (offset || tocopy != sb->s_blocksize)
2115 bh = sb_bread(sb, tmp_bh.b_blocknr);
2116 else
2117 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2118 if (!bh) {
2119 err = -EIO;
2120 goto out;
2121 }
2122 lock_buffer(bh);
2123 memcpy(bh->b_data + offset, data, tocopy);
2124 flush_dcache_page(bh->b_page);
2125 set_buffer_uptodate(bh);
2126 unlock_buffer(bh);
2127 reiserfs_prepare_for_journal(sb, bh, 1);
2128 journal_mark_dirty(current->journal_info, sb, bh);
2129 if (!journal_quota)
2130 reiserfs_add_ordered_list(inode, bh);
2131 brelse(bh);
2132 offset = 0;
2133 towrite -= tocopy;
2134 data += tocopy;
2135 blk++;
2136 }
2137 out:
2138 if (len == towrite)
2139 return err;
2140 if (inode->i_size < off + len - towrite)
2141 i_size_write(inode, off + len - towrite);
2142 inode->i_version++;
2143 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2144 mark_inode_dirty(inode);
2145 mutex_unlock(&inode->i_mutex);
2146 return len - towrite;
2147 }
2148
2149 #endif
2150
2151 static int get_super_block(struct file_system_type *fs_type,
2152 int flags, const char *dev_name,
2153 void *data, struct vfsmount *mnt)
2154 {
2155 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2156 mnt);
2157 }
2158
2159 static int __init init_reiserfs_fs(void)
2160 {
2161 int ret;
2162
2163 if ((ret = init_inodecache())) {
2164 return ret;
2165 }
2166
2167 if ((ret = reiserfs_xattr_register_handlers()))
2168 goto failed_reiserfs_xattr_register_handlers;
2169
2170 reiserfs_proc_info_global_init();
2171 reiserfs_proc_register_global("version",
2172 reiserfs_global_version_in_proc);
2173
2174 ret = register_filesystem(&reiserfs_fs_type);
2175
2176 if (ret == 0) {
2177 return 0;
2178 }
2179
2180 reiserfs_xattr_unregister_handlers();
2181
2182 failed_reiserfs_xattr_register_handlers:
2183 reiserfs_proc_unregister_global("version");
2184 reiserfs_proc_info_global_done();
2185 destroy_inodecache();
2186
2187 return ret;
2188 }
2189
2190 static void __exit exit_reiserfs_fs(void)
2191 {
2192 reiserfs_xattr_unregister_handlers();
2193 reiserfs_proc_unregister_global("version");
2194 reiserfs_proc_info_global_done();
2195 unregister_filesystem(&reiserfs_fs_type);
2196 destroy_inodecache();
2197 }
2198
2199 struct file_system_type reiserfs_fs_type = {
2200 .owner = THIS_MODULE,
2201 .name = "reiserfs",
2202 .get_sb = get_super_block,
2203 .kill_sb = reiserfs_kill_sb,
2204 .fs_flags = FS_REQUIRES_DEV,
2205 };
2206
2207 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2208 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2209 MODULE_LICENSE("GPL");
2210
2211 module_init(init_reiserfs_fs);
2212 module_exit(exit_reiserfs_fs);
WRT350N Kernel Patches