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reiserfs: strip trailing whitespace
[linux-2.6/mini2440.git] / fs / reiserfs / super.c
blobd7519b951500db88be2df98d0f0c0c22f92bc5a9
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30
31 struct file_system_type reiserfs_fs_type;
32
33 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
34 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
35 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
36
37 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
38 {
39 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
40 strlen(reiserfs_3_5_magic_string));
41 }
42
43 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
44 {
45 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
46 strlen(reiserfs_3_6_magic_string));
47 }
48
49 int is_reiserfs_jr(struct reiserfs_super_block *rs)
50 {
51 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
52 strlen(reiserfs_jr_magic_string));
53 }
54
55 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
56 {
57 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
58 is_reiserfs_jr(rs));
59 }
60
61 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
62 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
63
64 static int reiserfs_sync_fs(struct super_block *s, int wait)
65 {
66 if (!(s->s_flags & MS_RDONLY)) {
67 struct reiserfs_transaction_handle th;
68 reiserfs_write_lock(s);
69 if (!journal_begin(&th, s, 1))
70 if (!journal_end_sync(&th, s, 1))
71 reiserfs_flush_old_commits(s);
72 s->s_dirt = 0; /* Even if it's not true.
73 * We'll loop forever in sync_supers otherwise */
74 reiserfs_write_unlock(s);
75 } else {
76 s->s_dirt = 0;
77 }
78 return 0;
79 }
80
81 static void reiserfs_write_super(struct super_block *s)
82 {
83 reiserfs_sync_fs(s, 1);
84 }
85
86 static int reiserfs_freeze(struct super_block *s)
87 {
88 struct reiserfs_transaction_handle th;
89 reiserfs_write_lock(s);
90 if (!(s->s_flags & MS_RDONLY)) {
91 int err = journal_begin(&th, s, 1);
92 if (err) {
93 reiserfs_block_writes(&th);
94 } else {
95 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
96 1);
97 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
98 reiserfs_block_writes(&th);
99 journal_end_sync(&th, s, 1);
100 }
101 }
102 s->s_dirt = 0;
103 reiserfs_write_unlock(s);
104 return 0;
105 }
106
107 static int reiserfs_unfreeze(struct super_block *s)
108 {
109 reiserfs_allow_writes(s);
110 return 0;
111 }
112
113 extern const struct in_core_key MAX_IN_CORE_KEY;
114
115 /* this is used to delete "save link" when there are no items of a
116 file it points to. It can either happen if unlink is completed but
117 "save unlink" removal, or if file has both unlink and truncate
118 pending and as unlink completes first (because key of "save link"
119 protecting unlink is bigger that a key lf "save link" which
120 protects truncate), so there left no items to make truncate
121 completion on */
122 static int remove_save_link_only(struct super_block *s,
123 struct reiserfs_key *key, int oid_free)
124 {
125 struct reiserfs_transaction_handle th;
126 int err;
127
128 /* we are going to do one balancing */
129 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
130 if (err)
131 return err;
132
133 reiserfs_delete_solid_item(&th, NULL, key);
134 if (oid_free)
135 /* removals are protected by direct items */
136 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
137
138 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
139 }
140
141 #ifdef CONFIG_QUOTA
142 static int reiserfs_quota_on_mount(struct super_block *, int);
143 #endif
144
145 /* look for uncompleted unlinks and truncates and complete them */
146 static int finish_unfinished(struct super_block *s)
147 {
148 INITIALIZE_PATH(path);
149 struct cpu_key max_cpu_key, obj_key;
150 struct reiserfs_key save_link_key, last_inode_key;
151 int retval = 0;
152 struct item_head *ih;
153 struct buffer_head *bh;
154 int item_pos;
155 char *item;
156 int done;
157 struct inode *inode;
158 int truncate;
159 #ifdef CONFIG_QUOTA
160 int i;
161 int ms_active_set;
162 #endif
163
164 /* compose key to look for "save" links */
165 max_cpu_key.version = KEY_FORMAT_3_5;
166 max_cpu_key.on_disk_key.k_dir_id = ~0U;
167 max_cpu_key.on_disk_key.k_objectid = ~0U;
168 set_cpu_key_k_offset(&max_cpu_key, ~0U);
169 max_cpu_key.key_length = 3;
170
171 memset(&last_inode_key, 0, sizeof(last_inode_key));
172
173 #ifdef CONFIG_QUOTA
174 /* Needed for iput() to work correctly and not trash data */
175 if (s->s_flags & MS_ACTIVE) {
176 ms_active_set = 0;
177 } else {
178 ms_active_set = 1;
179 s->s_flags |= MS_ACTIVE;
180 }
181 /* Turn on quotas so that they are updated correctly */
182 for (i = 0; i < MAXQUOTAS; i++) {
183 if (REISERFS_SB(s)->s_qf_names[i]) {
184 int ret = reiserfs_quota_on_mount(s, i);
185 if (ret < 0)
186 reiserfs_warning(s, "reiserfs-2500",
187 "cannot turn on journaled "
188 "quota: error %d", ret);
189 }
190 }
191 #endif
192
193 done = 0;
194 REISERFS_SB(s)->s_is_unlinked_ok = 1;
195 while (!retval) {
196 retval = search_item(s, &max_cpu_key, &path);
197 if (retval != ITEM_NOT_FOUND) {
198 reiserfs_error(s, "vs-2140",
199 "search_by_key returned %d", retval);
200 break;
201 }
202
203 bh = get_last_bh(&path);
204 item_pos = get_item_pos(&path);
205 if (item_pos != B_NR_ITEMS(bh)) {
206 reiserfs_warning(s, "vs-2060",
207 "wrong position found");
208 break;
209 }
210 item_pos--;
211 ih = B_N_PITEM_HEAD(bh, item_pos);
212
213 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
214 /* there are no "save" links anymore */
215 break;
216
217 save_link_key = ih->ih_key;
218 if (is_indirect_le_ih(ih))
219 truncate = 1;
220 else
221 truncate = 0;
222
223 /* reiserfs_iget needs k_dirid and k_objectid only */
224 item = B_I_PITEM(bh, ih);
225 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
226 obj_key.on_disk_key.k_objectid =
227 le32_to_cpu(ih->ih_key.k_objectid);
228 obj_key.on_disk_key.k_offset = 0;
229 obj_key.on_disk_key.k_type = 0;
230
231 pathrelse(&path);
232
233 inode = reiserfs_iget(s, &obj_key);
234 if (!inode) {
235 /* the unlink almost completed, it just did not manage to remove
236 "save" link and release objectid */
237 reiserfs_warning(s, "vs-2180", "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, "vs-2185",
246 "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, "green-2101",
259 "impossible truncate on a "
260 "directory %k. Please report",
261 INODE_PKEY(inode));
262 retval = remove_save_link_only(s, &save_link_key, 0);
263 truncate = 0;
264 iput(inode);
265 continue;
266 }
267
268 if (truncate) {
269 REISERFS_I(inode)->i_flags |=
270 i_link_saved_truncate_mask;
271 /* not completed truncate found. New size was committed together
272 with "save" link */
273 reiserfs_info(s, "Truncating %k to %Ld ..",
274 INODE_PKEY(inode), inode->i_size);
275 reiserfs_truncate_file(inode,
276 0
277 /*don't update modification time */
278 );
279 retval = remove_save_link(inode, truncate);
280 } else {
281 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
282 /* not completed unlink (rmdir) found */
283 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
284 if (memcmp(&last_inode_key, INODE_PKEY(inode),
285 sizeof(last_inode_key))){
286 last_inode_key = *INODE_PKEY(inode);
287 /* removal gets completed in iput */
288 retval = 0;
289 } else {
290 reiserfs_warning(s, "super-2189", "Dead loop "
291 "in finish_unfinished "
292 "detected, just remove "
293 "save link\n");
294 retval = remove_save_link_only(s,
295 &save_link_key, 0);
296 }
297 }
298
299 iput(inode);
300 printk("done\n");
301 done++;
302 }
303 REISERFS_SB(s)->s_is_unlinked_ok = 0;
304
305 #ifdef CONFIG_QUOTA
306 /* Turn quotas off */
307 for (i = 0; i < MAXQUOTAS; i++) {
308 if (sb_dqopt(s)->files[i])
309 vfs_quota_off(s, i, 0);
310 }
311 if (ms_active_set)
312 /* Restore the flag back */
313 s->s_flags &= ~MS_ACTIVE;
314 #endif
315 pathrelse(&path);
316 if (done)
317 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
318 "Completed\n", done);
319 return retval;
320 }
321
322 /* to protect file being unlinked from getting lost we "safe" link files
323 being unlinked. This link will be deleted in the same transaction with last
324 item of file. mounting the filesystem we scan all these links and remove
325 files which almost got lost */
326 void add_save_link(struct reiserfs_transaction_handle *th,
327 struct inode *inode, int truncate)
328 {
329 INITIALIZE_PATH(path);
330 int retval;
331 struct cpu_key key;
332 struct item_head ih;
333 __le32 link;
334
335 BUG_ON(!th->t_trans_id);
336
337 /* file can only get one "save link" of each kind */
338 RFALSE(truncate &&
339 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
340 "saved link already exists for truncated inode %lx",
341 (long)inode->i_ino);
342 RFALSE(!truncate &&
343 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
344 "saved link already exists for unlinked inode %lx",
345 (long)inode->i_ino);
346
347 /* setup key of "save" link */
348 key.version = KEY_FORMAT_3_5;
349 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
350 key.on_disk_key.k_objectid = inode->i_ino;
351 if (!truncate) {
352 /* unlink, rmdir, rename */
353 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
354 set_cpu_key_k_type(&key, TYPE_DIRECT);
355
356 /* item head of "safe" link */
357 make_le_item_head(&ih, &key, key.version,
358 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
359 4 /*length */ , 0xffff /*free space */ );
360 } else {
361 /* truncate */
362 if (S_ISDIR(inode->i_mode))
363 reiserfs_warning(inode->i_sb, "green-2102",
364 "Adding a truncate savelink for "
365 "a directory %k! Please report",
366 INODE_PKEY(inode));
367 set_cpu_key_k_offset(&key, 1);
368 set_cpu_key_k_type(&key, TYPE_INDIRECT);
369
370 /* item head of "safe" link */
371 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
372 4 /*length */ , 0 /*free space */ );
373 }
374 key.key_length = 3;
375
376 /* look for its place in the tree */
377 retval = search_item(inode->i_sb, &key, &path);
378 if (retval != ITEM_NOT_FOUND) {
379 if (retval != -ENOSPC)
380 reiserfs_error(inode->i_sb, "vs-2100",
381 "search_by_key (%K) returned %d", &key,
382 retval);
383 pathrelse(&path);
384 return;
385 }
386
387 /* body of "save" link */
388 link = INODE_PKEY(inode)->k_dir_id;
389
390 /* put "save" link inot tree, don't charge quota to anyone */
391 retval =
392 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
393 if (retval) {
394 if (retval != -ENOSPC)
395 reiserfs_error(inode->i_sb, "vs-2120",
396 "insert_item returned %d", retval);
397 } else {
398 if (truncate)
399 REISERFS_I(inode)->i_flags |=
400 i_link_saved_truncate_mask;
401 else
402 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
403 }
404 }
405
406 /* this opens transaction unlike add_save_link */
407 int remove_save_link(struct inode *inode, int truncate)
408 {
409 struct reiserfs_transaction_handle th;
410 struct reiserfs_key key;
411 int err;
412
413 /* we are going to do one balancing only */
414 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
415 if (err)
416 return err;
417
418 /* setup key of "save" link */
419 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
420 key.k_objectid = INODE_PKEY(inode)->k_objectid;
421 if (!truncate) {
422 /* unlink, rmdir, rename */
423 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
424 1 + inode->i_sb->s_blocksize);
425 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
426 } else {
427 /* truncate */
428 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
429 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
430 }
431
432 if ((truncate &&
433 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
434 (!truncate &&
435 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
436 /* don't take quota bytes from anywhere */
437 reiserfs_delete_solid_item(&th, NULL, &key);
438 if (!truncate) {
439 reiserfs_release_objectid(&th, inode->i_ino);
440 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
441 } else
442 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
443
444 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
445 }
446
447 static void reiserfs_kill_sb(struct super_block *s)
448 {
449 if (REISERFS_SB(s)) {
450 #ifdef CONFIG_REISERFS_FS_XATTR
451 if (REISERFS_SB(s)->xattr_root) {
452 d_invalidate(REISERFS_SB(s)->xattr_root);
453 dput(REISERFS_SB(s)->xattr_root);
454 REISERFS_SB(s)->xattr_root = NULL;
455 }
456 #endif
457 if (REISERFS_SB(s)->priv_root) {
458 d_invalidate(REISERFS_SB(s)->priv_root);
459 dput(REISERFS_SB(s)->priv_root);
460 REISERFS_SB(s)->priv_root = NULL;
461 }
462 }
463
464 kill_block_super(s);
465 }
466
467 static void reiserfs_put_super(struct super_block *s)
468 {
469 struct reiserfs_transaction_handle th;
470 th.t_trans_id = 0;
471
472 /* change file system state to current state if it was mounted with read-write permissions */
473 if (!(s->s_flags & MS_RDONLY)) {
474 if (!journal_begin(&th, s, 10)) {
475 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
476 1);
477 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
478 REISERFS_SB(s)->s_mount_state);
479 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
480 }
481 }
482
483 /* note, journal_release checks for readonly mount, and can decide not
484 ** to do a journal_end
485 */
486 journal_release(&th, s);
487
488 reiserfs_free_bitmap_cache(s);
489
490 brelse(SB_BUFFER_WITH_SB(s));
491
492 print_statistics(s);
493
494 if (REISERFS_SB(s)->reserved_blocks != 0) {
495 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
496 REISERFS_SB(s)->reserved_blocks);
497 }
498
499 reiserfs_proc_info_done(s);
500
501 kfree(s->s_fs_info);
502 s->s_fs_info = NULL;
503
504 return;
505 }
506
507 static struct kmem_cache *reiserfs_inode_cachep;
508
509 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
510 {
511 struct reiserfs_inode_info *ei;
512 ei = (struct reiserfs_inode_info *)
513 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
514 if (!ei)
515 return NULL;
516 return &ei->vfs_inode;
517 }
518
519 static void reiserfs_destroy_inode(struct inode *inode)
520 {
521 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
522 }
523
524 static void init_once(void *foo)
525 {
526 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
527
528 INIT_LIST_HEAD(&ei->i_prealloc_list);
529 inode_init_once(&ei->vfs_inode);
530 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
531 ei->i_acl_access = NULL;
532 ei->i_acl_default = NULL;
533 #endif
534 }
535
536 static int init_inodecache(void)
537 {
538 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
539 sizeof(struct
540 reiserfs_inode_info),
541 0, (SLAB_RECLAIM_ACCOUNT|
542 SLAB_MEM_SPREAD),
543 init_once);
544 if (reiserfs_inode_cachep == NULL)
545 return -ENOMEM;
546 return 0;
547 }
548
549 static void destroy_inodecache(void)
550 {
551 kmem_cache_destroy(reiserfs_inode_cachep);
552 }
553
554 /* we don't mark inodes dirty, we just log them */
555 static void reiserfs_dirty_inode(struct inode *inode)
556 {
557 struct reiserfs_transaction_handle th;
558
559 int err = 0;
560 if (inode->i_sb->s_flags & MS_RDONLY) {
561 reiserfs_warning(inode->i_sb, "clm-6006",
562 "writing inode %lu on readonly FS",
563 inode->i_ino);
564 return;
565 }
566 reiserfs_write_lock(inode->i_sb);
567
568 /* this is really only used for atime updates, so they don't have
569 ** to be included in O_SYNC or fsync
570 */
571 err = journal_begin(&th, inode->i_sb, 1);
572 if (err) {
573 reiserfs_write_unlock(inode->i_sb);
574 return;
575 }
576 reiserfs_update_sd(&th, inode);
577 journal_end(&th, inode->i_sb, 1);
578 reiserfs_write_unlock(inode->i_sb);
579 }
580
581 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584 struct posix_acl *acl;
585
586 acl = REISERFS_I(inode)->i_acl_access;
587 if (acl && !IS_ERR(acl))
588 posix_acl_release(acl);
589 REISERFS_I(inode)->i_acl_access = NULL;
590
591 acl = REISERFS_I(inode)->i_acl_default;
592 if (acl && !IS_ERR(acl))
593 posix_acl_release(acl);
594 REISERFS_I(inode)->i_acl_default = NULL;
595 }
596 #else
597 #define reiserfs_clear_inode NULL
598 #endif
599
600 #ifdef CONFIG_QUOTA
601 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
602 size_t, loff_t);
603 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
604 loff_t);
605 #endif
606
607 static const struct super_operations reiserfs_sops = {
608 .alloc_inode = reiserfs_alloc_inode,
609 .destroy_inode = reiserfs_destroy_inode,
610 .write_inode = reiserfs_write_inode,
611 .dirty_inode = reiserfs_dirty_inode,
612 .delete_inode = reiserfs_delete_inode,
613 .clear_inode = reiserfs_clear_inode,
614 .put_super = reiserfs_put_super,
615 .write_super = reiserfs_write_super,
616 .sync_fs = reiserfs_sync_fs,
617 .freeze_fs = reiserfs_freeze,
618 .unfreeze_fs = reiserfs_unfreeze,
619 .statfs = reiserfs_statfs,
620 .remount_fs = reiserfs_remount,
621 .show_options = generic_show_options,
622 #ifdef CONFIG_QUOTA
623 .quota_read = reiserfs_quota_read,
624 .quota_write = reiserfs_quota_write,
625 #endif
626 };
627
628 #ifdef CONFIG_QUOTA
629 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
630
631 static int reiserfs_dquot_initialize(struct inode *, int);
632 static int reiserfs_dquot_drop(struct inode *);
633 static int reiserfs_write_dquot(struct dquot *);
634 static int reiserfs_acquire_dquot(struct dquot *);
635 static int reiserfs_release_dquot(struct dquot *);
636 static int reiserfs_mark_dquot_dirty(struct dquot *);
637 static int reiserfs_write_info(struct super_block *, int);
638 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
639
640 static struct dquot_operations reiserfs_quota_operations = {
641 .initialize = reiserfs_dquot_initialize,
642 .drop = reiserfs_dquot_drop,
643 .alloc_space = dquot_alloc_space,
644 .alloc_inode = dquot_alloc_inode,
645 .free_space = dquot_free_space,
646 .free_inode = dquot_free_inode,
647 .transfer = dquot_transfer,
648 .write_dquot = reiserfs_write_dquot,
649 .acquire_dquot = reiserfs_acquire_dquot,
650 .release_dquot = reiserfs_release_dquot,
651 .mark_dirty = reiserfs_mark_dquot_dirty,
652 .write_info = reiserfs_write_info,
653 .alloc_dquot = dquot_alloc,
654 .destroy_dquot = dquot_destroy,
655 };
656
657 static struct quotactl_ops reiserfs_qctl_operations = {
658 .quota_on = reiserfs_quota_on,
659 .quota_off = vfs_quota_off,
660 .quota_sync = vfs_quota_sync,
661 .get_info = vfs_get_dqinfo,
662 .set_info = vfs_set_dqinfo,
663 .get_dqblk = vfs_get_dqblk,
664 .set_dqblk = vfs_set_dqblk,
665 };
666 #endif
667
668 static const struct export_operations reiserfs_export_ops = {
669 .encode_fh = reiserfs_encode_fh,
670 .fh_to_dentry = reiserfs_fh_to_dentry,
671 .fh_to_parent = reiserfs_fh_to_parent,
672 .get_parent = reiserfs_get_parent,
673 };
674
675 /* this struct is used in reiserfs_getopt () for containing the value for those
676 mount options that have values rather than being toggles. */
677 typedef struct {
678 char *value;
679 int setmask; /* bitmask which is to set on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. */
681 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
682 value is found, 0 is no bits are to be changed. This is
683 applied BEFORE setmask */
684 } arg_desc_t;
685
686 /* Set this bit in arg_required to allow empty arguments */
687 #define REISERFS_OPT_ALLOWEMPTY 31
688
689 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
690 mount options */
691 typedef struct {
692 char *option_name;
693 int arg_required; /* 0 if argument is not required, not 0 otherwise */
694 const arg_desc_t *values; /* list of values accepted by an option */
695 int setmask; /* bitmask which is to set on mount_options bitmask when this
696 value is found, 0 is no bits are to be changed. */
697 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
698 value is found, 0 is no bits are to be changed. This is
699 applied BEFORE setmask */
700 } opt_desc_t;
701
702 /* possible values for -o data= */
703 static const arg_desc_t logging_mode[] = {
704 {"ordered", 1 << REISERFS_DATA_ORDERED,
705 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
706 {"journal", 1 << REISERFS_DATA_LOG,
707 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
708 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
709 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
710 {.value = NULL}
711 };
712
713 /* possible values for -o barrier= */
714 static const arg_desc_t barrier_mode[] = {
715 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
716 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
717 {.value = NULL}
718 };
719
720 /* possible values for "-o block-allocator=" and bits which are to be set in
721 s_mount_opt of reiserfs specific part of in-core super block */
722 static const arg_desc_t balloc[] = {
723 {"noborder", 1 << REISERFS_NO_BORDER, 0},
724 {"border", 0, 1 << REISERFS_NO_BORDER},
725 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
726 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
727 {"test4", 1 << REISERFS_TEST4, 0},
728 {"notest4", 0, 1 << REISERFS_TEST4},
729 {NULL, 0, 0}
730 };
731
732 static const arg_desc_t tails[] = {
733 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
734 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
735 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
736 {NULL, 0, 0}
737 };
738
739 static const arg_desc_t error_actions[] = {
740 {"panic", 1 << REISERFS_ERROR_PANIC,
741 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
742 {"ro-remount", 1 << REISERFS_ERROR_RO,
743 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
744 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
745 {"continue", 1 << REISERFS_ERROR_CONTINUE,
746 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
747 #endif
748 {NULL, 0, 0},
749 };
750
751 /* proceed only one option from a list *cur - string containing of mount options
752 opts - array of options which are accepted
753 opt_arg - if option is found and requires an argument and if it is specifed
754 in the input - pointer to the argument is stored here
755 bit_flags - if option requires to set a certain bit - it is set here
756 return -1 if unknown option is found, opt->arg_required otherwise */
757 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
758 char **opt_arg, unsigned long *bit_flags)
759 {
760 char *p;
761 /* foo=bar,
762 ^ ^ ^
763 | | +-- option_end
764 | +-- arg_start
765 +-- option_start
766 */
767 const opt_desc_t *opt;
768 const arg_desc_t *arg;
769
770 p = *cur;
771
772 /* assume argument cannot contain commas */
773 *cur = strchr(p, ',');
774 if (*cur) {
775 *(*cur) = '\0';
776 (*cur)++;
777 }
778
779 if (!strncmp(p, "alloc=", 6)) {
780 /* Ugly special case, probably we should redo options parser so that
781 it can understand several arguments for some options, also so that
782 it can fill several bitfields with option values. */
783 if (reiserfs_parse_alloc_options(s, p + 6)) {
784 return -1;
785 } else {
786 return 0;
787 }
788 }
789
790 /* for every option in the list */
791 for (opt = opts; opt->option_name; opt++) {
792 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
793 if (bit_flags) {
794 if (opt->clrmask ==
795 (1 << REISERFS_UNSUPPORTED_OPT))
796 reiserfs_warning(s, "super-6500",
797 "%s not supported.\n",
798 p);
799 else
800 *bit_flags &= ~opt->clrmask;
801 if (opt->setmask ==
802 (1 << REISERFS_UNSUPPORTED_OPT))
803 reiserfs_warning(s, "super-6501",
804 "%s not supported.\n",
805 p);
806 else
807 *bit_flags |= opt->setmask;
808 }
809 break;
810 }
811 }
812 if (!opt->option_name) {
813 reiserfs_warning(s, "super-6502",
814 "unknown mount option \"%s\"", p);
815 return -1;
816 }
817
818 p += strlen(opt->option_name);
819 switch (*p) {
820 case '=':
821 if (!opt->arg_required) {
822 reiserfs_warning(s, "super-6503",
823 "the option \"%s\" does not "
824 "require an argument\n",
825 opt->option_name);
826 return -1;
827 }
828 break;
829
830 case 0:
831 if (opt->arg_required) {
832 reiserfs_warning(s, "super-6504",
833 "the option \"%s\" requires an "
834 "argument\n", opt->option_name);
835 return -1;
836 }
837 break;
838 default:
839 reiserfs_warning(s, "super-6505",
840 "head of option \"%s\" is only correct\n",
841 opt->option_name);
842 return -1;
843 }
844
845 /* move to the argument, or to next option if argument is not required */
846 p++;
847
848 if (opt->arg_required
849 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
850 && !strlen(p)) {
851 /* this catches "option=," if not allowed */
852 reiserfs_warning(s, "super-6506",
853 "empty argument for \"%s\"\n",
854 opt->option_name);
855 return -1;
856 }
857
858 if (!opt->values) {
859 /* *=NULLopt_arg contains pointer to argument */
860 *opt_arg = p;
861 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
862 }
863
864 /* values possible for this option are listed in opt->values */
865 for (arg = opt->values; arg->value; arg++) {
866 if (!strcmp(p, arg->value)) {
867 if (bit_flags) {
868 *bit_flags &= ~arg->clrmask;
869 *bit_flags |= arg->setmask;
870 }
871 return opt->arg_required;
872 }
873 }
874
875 reiserfs_warning(s, "super-6506",
876 "bad value \"%s\" for option \"%s\"\n", p,
877 opt->option_name);
878 return -1;
879 }
880
881 /* returns 0 if something is wrong in option string, 1 - otherwise */
882 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
883 unsigned long *mount_options,
884 /* after the parsing phase, contains the
885 collection of bitflags defining what
886 mount options were selected. */
887 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
888 char **jdev_name,
889 unsigned int *commit_max_age,
890 char **qf_names,
891 unsigned int *qfmt)
892 {
893 int c;
894 char *arg = NULL;
895 char *pos;
896 opt_desc_t opts[] = {
897 /* Compatibility stuff, so that -o notail for old setups still work */
898 {"tails",.arg_required = 't',.values = tails},
899 {"notail",.clrmask =
900 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
901 {"conv",.setmask = 1 << REISERFS_CONVERT},
902 {"attrs",.setmask = 1 << REISERFS_ATTRS},
903 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
904 #ifdef CONFIG_REISERFS_FS_XATTR
905 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
906 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
907 #else
908 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
909 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
910 #endif
911 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
912 {"acl",.setmask = 1 << REISERFS_POSIXACL},
913 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
914 #else
915 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
916 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
917 #endif
918 {.option_name = "nolog"},
919 {"replayonly",.setmask = 1 << REPLAYONLY},
920 {"block-allocator",.arg_required = 'a',.values = balloc},
921 {"data",.arg_required = 'd',.values = logging_mode},
922 {"barrier",.arg_required = 'b',.values = barrier_mode},
923 {"resize",.arg_required = 'r',.values = NULL},
924 {"jdev",.arg_required = 'j',.values = NULL},
925 {"nolargeio",.arg_required = 'w',.values = NULL},
926 {"commit",.arg_required = 'c',.values = NULL},
927 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
928 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
929 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
930 {"errors",.arg_required = 'e',.values = error_actions},
931 {"usrjquota",.arg_required =
932 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
933 {"grpjquota",.arg_required =
934 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
935 {"jqfmt",.arg_required = 'f',.values = NULL},
936 {.option_name = NULL}
937 };
938
939 *blocks = 0;
940 if (!options || !*options)
941 /* use default configuration: create tails, journaling on, no
942 conversion to newest format */
943 return 1;
944
945 for (pos = options; pos;) {
946 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
947 if (c == -1)
948 /* wrong option is given */
949 return 0;
950
951 if (c == 'r') {
952 char *p;
953
954 p = NULL;
955 /* "resize=NNN" or "resize=auto" */
956
957 if (!strcmp(arg, "auto")) {
958 /* From JFS code, to auto-get the size. */
959 *blocks =
960 s->s_bdev->bd_inode->i_size >> s->
961 s_blocksize_bits;
962 } else {
963 *blocks = simple_strtoul(arg, &p, 0);
964 if (*p != '\0') {
965 /* NNN does not look like a number */
966 reiserfs_warning(s, "super-6507",
967 "bad value %s for "
968 "-oresize\n", arg);
969 return 0;
970 }
971 }
972 }
973
974 if (c == 'c') {
975 char *p = NULL;
976 unsigned long val = simple_strtoul(arg, &p, 0);
977 /* commit=NNN (time in seconds) */
978 if (*p != '\0' || val >= (unsigned int)-1) {
979 reiserfs_warning(s, "super-6508",
980 "bad value %s for -ocommit\n",
981 arg);
982 return 0;
983 }
984 *commit_max_age = (unsigned int)val;
985 }
986
987 if (c == 'w') {
988 reiserfs_warning(s, "super-6509", "nolargeio option "
989 "is no longer supported");
990 return 0;
991 }
992
993 if (c == 'j') {
994 if (arg && *arg && jdev_name) {
995 if (*jdev_name) { //Hm, already assigned?
996 reiserfs_warning(s, "super-6510",
997 "journal device was "
998 "already specified to "
999 "be %s", *jdev_name);
1000 return 0;
1001 }
1002 *jdev_name = arg;
1003 }
1004 }
1005 #ifdef CONFIG_QUOTA
1006 if (c == 'u' || c == 'g') {
1007 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1008
1009 if (sb_any_quota_loaded(s) &&
1010 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1011 reiserfs_warning(s, "super-6511",
1012 "cannot change journaled "
1013 "quota options when quota "
1014 "turned on.");
1015 return 0;
1016 }
1017 if (*arg) { /* Some filename specified? */
1018 if (REISERFS_SB(s)->s_qf_names[qtype]
1019 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1020 arg)) {
1021 reiserfs_warning(s, "super-6512",
1022 "%s quota file "
1023 "already specified.",
1024 QTYPE2NAME(qtype));
1025 return 0;
1026 }
1027 if (strchr(arg, '/')) {
1028 reiserfs_warning(s, "super-6513",
1029 "quotafile must be "
1030 "on filesystem root.");
1031 return 0;
1032 }
1033 qf_names[qtype] =
1034 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1035 if (!qf_names[qtype]) {
1036 reiserfs_warning(s, "reiserfs-2502",
1037 "not enough memory "
1038 "for storing "
1039 "quotafile name.");
1040 return 0;
1041 }
1042 strcpy(qf_names[qtype], arg);
1043 *mount_options |= 1 << REISERFS_QUOTA;
1044 } else {
1045 if (qf_names[qtype] !=
1046 REISERFS_SB(s)->s_qf_names[qtype])
1047 kfree(qf_names[qtype]);
1048 qf_names[qtype] = NULL;
1049 }
1050 }
1051 if (c == 'f') {
1052 if (!strcmp(arg, "vfsold"))
1053 *qfmt = QFMT_VFS_OLD;
1054 else if (!strcmp(arg, "vfsv0"))
1055 *qfmt = QFMT_VFS_V0;
1056 else {
1057 reiserfs_warning(s, "super-6514",
1058 "unknown quota format "
1059 "specified.");
1060 return 0;
1061 }
1062 if (sb_any_quota_loaded(s) &&
1063 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1064 reiserfs_warning(s, "super-6515",
1065 "cannot change journaled "
1066 "quota options when quota "
1067 "turned on.");
1068 return 0;
1069 }
1070 }
1071 #else
1072 if (c == 'u' || c == 'g' || c == 'f') {
1073 reiserfs_warning(s, "reiserfs-2503", "journaled "
1074 "quota options not supported.");
1075 return 0;
1076 }
1077 #endif
1078 }
1079
1080 #ifdef CONFIG_QUOTA
1081 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1082 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1083 reiserfs_warning(s, "super-6515",
1084 "journaled quota format not specified.");
1085 return 0;
1086 }
1087 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1088 if (!(*mount_options & (1 << REISERFS_QUOTA))
1089 && sb_any_quota_loaded(s)) {
1090 reiserfs_warning(s, "super-6516", "quota options must "
1091 "be present when quota is turned on.");
1092 return 0;
1093 }
1094 #endif
1095
1096 return 1;
1097 }
1098
1099 static void switch_data_mode(struct super_block *s, unsigned long mode)
1100 {
1101 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1102 (1 << REISERFS_DATA_ORDERED) |
1103 (1 << REISERFS_DATA_WRITEBACK));
1104 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1105 }
1106
1107 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1108 {
1109 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1110 if (!reiserfs_data_log(s)) {
1111 switch_data_mode(s, REISERFS_DATA_LOG);
1112 reiserfs_info(s, "switching to journaled data mode\n");
1113 }
1114 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1115 if (!reiserfs_data_ordered(s)) {
1116 switch_data_mode(s, REISERFS_DATA_ORDERED);
1117 reiserfs_info(s, "switching to ordered data mode\n");
1118 }
1119 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1120 if (!reiserfs_data_writeback(s)) {
1121 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1122 reiserfs_info(s, "switching to writeback data mode\n");
1123 }
1124 }
1125 }
1126
1127 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1128 {
1129 int flush = (1 << REISERFS_BARRIER_FLUSH);
1130 int none = (1 << REISERFS_BARRIER_NONE);
1131 int all_barrier = flush | none;
1132
1133 if (bits & all_barrier) {
1134 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1135 if (bits & flush) {
1136 REISERFS_SB(s)->s_mount_opt |= flush;
1137 printk("reiserfs: enabling write barrier flush mode\n");
1138 } else if (bits & none) {
1139 REISERFS_SB(s)->s_mount_opt |= none;
1140 printk("reiserfs: write barriers turned off\n");
1141 }
1142 }
1143 }
1144
1145 static void handle_attrs(struct super_block *s)
1146 {
1147 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1148
1149 if (reiserfs_attrs(s)) {
1150 if (old_format_only(s)) {
1151 reiserfs_warning(s, "super-6517", "cannot support "
1152 "attributes on 3.5.x disk format");
1153 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1154 return;
1155 }
1156 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1157 reiserfs_warning(s, "super-6518", "cannot support "
1158 "attributes until flag is set in "
1159 "super-block");
1160 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1161 }
1162 }
1163 }
1164
1165 #ifdef CONFIG_QUOTA
1166 static void handle_quota_files(struct super_block *s, char **qf_names,
1167 unsigned int *qfmt)
1168 {
1169 int i;
1170
1171 for (i = 0; i < MAXQUOTAS; i++) {
1172 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1173 kfree(REISERFS_SB(s)->s_qf_names[i]);
1174 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1175 }
1176 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1177 }
1178 #endif
1179
1180 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1181 {
1182 struct reiserfs_super_block *rs;
1183 struct reiserfs_transaction_handle th;
1184 unsigned long blocks;
1185 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1186 unsigned long safe_mask = 0;
1187 unsigned int commit_max_age = (unsigned int)-1;
1188 struct reiserfs_journal *journal = SB_JOURNAL(s);
1189 char *new_opts = kstrdup(arg, GFP_KERNEL);
1190 int err;
1191 char *qf_names[MAXQUOTAS];
1192 unsigned int qfmt = 0;
1193 #ifdef CONFIG_QUOTA
1194 int i;
1195
1196 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1197 #endif
1198
1199 rs = SB_DISK_SUPER_BLOCK(s);
1200
1201 if (!reiserfs_parse_options
1202 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1203 qf_names, &qfmt)) {
1204 #ifdef CONFIG_QUOTA
1205 for (i = 0; i < MAXQUOTAS; i++)
1206 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1207 kfree(qf_names[i]);
1208 #endif
1209 err = -EINVAL;
1210 goto out_err;
1211 }
1212 #ifdef CONFIG_QUOTA
1213 handle_quota_files(s, qf_names, &qfmt);
1214 #endif
1215
1216 handle_attrs(s);
1217
1218 /* Add options that are safe here */
1219 safe_mask |= 1 << REISERFS_SMALLTAIL;
1220 safe_mask |= 1 << REISERFS_LARGETAIL;
1221 safe_mask |= 1 << REISERFS_NO_BORDER;
1222 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1223 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1224 safe_mask |= 1 << REISERFS_TEST4;
1225 safe_mask |= 1 << REISERFS_ATTRS;
1226 safe_mask |= 1 << REISERFS_XATTRS_USER;
1227 safe_mask |= 1 << REISERFS_POSIXACL;
1228 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1229 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1230 safe_mask |= 1 << REISERFS_ERROR_RO;
1231 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1232 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1233 safe_mask |= 1 << REISERFS_QUOTA;
1234
1235 /* Update the bitmask, taking care to keep
1236 * the bits we're not allowed to change here */
1237 REISERFS_SB(s)->s_mount_opt =
1238 (REISERFS_SB(s)->
1239 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1240
1241 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1242 journal->j_max_commit_age = commit_max_age;
1243 journal->j_max_trans_age = commit_max_age;
1244 } else if (commit_max_age == 0) {
1245 /* 0 means restore defaults. */
1246 journal->j_max_commit_age = journal->j_default_max_commit_age;
1247 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1248 }
1249
1250 if (blocks) {
1251 err = reiserfs_resize(s, blocks);
1252 if (err != 0)
1253 goto out_err;
1254 }
1255
1256 if (*mount_flags & MS_RDONLY) {
1257 reiserfs_xattr_init(s, *mount_flags);
1258 /* remount read-only */
1259 if (s->s_flags & MS_RDONLY)
1260 /* it is read-only already */
1261 goto out_ok;
1262 /* try to remount file system with read-only permissions */
1263 if (sb_umount_state(rs) == REISERFS_VALID_FS
1264 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1265 goto out_ok;
1266 }
1267
1268 err = journal_begin(&th, s, 10);
1269 if (err)
1270 goto out_err;
1271
1272 /* Mounting a rw partition read-only. */
1273 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1274 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1275 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1276 } else {
1277 /* remount read-write */
1278 if (!(s->s_flags & MS_RDONLY)) {
1279 reiserfs_xattr_init(s, *mount_flags);
1280 goto out_ok; /* We are read-write already */
1281 }
1282
1283 if (reiserfs_is_journal_aborted(journal)) {
1284 err = journal->j_errno;
1285 goto out_err;
1286 }
1287
1288 handle_data_mode(s, mount_options);
1289 handle_barrier_mode(s, mount_options);
1290 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1291 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1292 err = journal_begin(&th, s, 10);
1293 if (err)
1294 goto out_err;
1295
1296 /* Mount a partition which is read-only, read-write */
1297 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1298 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1299 s->s_flags &= ~MS_RDONLY;
1300 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1301 if (!old_format_only(s))
1302 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1303 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1304 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1305 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1306 }
1307 /* this will force a full flush of all journal lists */
1308 SB_JOURNAL(s)->j_must_wait = 1;
1309 err = journal_end(&th, s, 10);
1310 if (err)
1311 goto out_err;
1312 s->s_dirt = 0;
1313
1314 if (!(*mount_flags & MS_RDONLY)) {
1315 finish_unfinished(s);
1316 reiserfs_xattr_init(s, *mount_flags);
1317 }
1318
1319 out_ok:
1320 kfree(s->s_options);
1321 s->s_options = new_opts;
1322 return 0;
1323
1324 out_err:
1325 kfree(new_opts);
1326 return err;
1327 }
1328
1329 static int read_super_block(struct super_block *s, int offset)
1330 {
1331 struct buffer_head *bh;
1332 struct reiserfs_super_block *rs;
1333 int fs_blocksize;
1334
1335 bh = sb_bread(s, offset / s->s_blocksize);
1336 if (!bh) {
1337 reiserfs_warning(s, "sh-2006",
1338 "bread failed (dev %s, block %lu, size %lu)",
1339 reiserfs_bdevname(s), offset / s->s_blocksize,
1340 s->s_blocksize);
1341 return 1;
1342 }
1343
1344 rs = (struct reiserfs_super_block *)bh->b_data;
1345 if (!is_any_reiserfs_magic_string(rs)) {
1346 brelse(bh);
1347 return 1;
1348 }
1349 //
1350 // ok, reiserfs signature (old or new) found in at the given offset
1351 //
1352 fs_blocksize = sb_blocksize(rs);
1353 brelse(bh);
1354 sb_set_blocksize(s, fs_blocksize);
1355
1356 bh = sb_bread(s, offset / s->s_blocksize);
1357 if (!bh) {
1358 reiserfs_warning(s, "sh-2007",
1359 "bread failed (dev %s, block %lu, size %lu)",
1360 reiserfs_bdevname(s), offset / s->s_blocksize,
1361 s->s_blocksize);
1362 return 1;
1363 }
1364
1365 rs = (struct reiserfs_super_block *)bh->b_data;
1366 if (sb_blocksize(rs) != s->s_blocksize) {
1367 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1368 "filesystem on (dev %s, block %Lu, size %lu)",
1369 reiserfs_bdevname(s),
1370 (unsigned long long)bh->b_blocknr,
1371 s->s_blocksize);
1372 brelse(bh);
1373 return 1;
1374 }
1375
1376 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1377 brelse(bh);
1378 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1379 "--rebuild-tree run detected. Please run\n"
1380 "reiserfsck --rebuild-tree and wait for a "
1381 "completion. If that fails\n"
1382 "get newer reiserfsprogs package");
1383 return 1;
1384 }
1385
1386 SB_BUFFER_WITH_SB(s) = bh;
1387 SB_DISK_SUPER_BLOCK(s) = rs;
1388
1389 if (is_reiserfs_jr(rs)) {
1390 /* magic is of non-standard journal filesystem, look at s_version to
1391 find which format is in use */
1392 if (sb_version(rs) == REISERFS_VERSION_2)
1393 reiserfs_info(s, "found reiserfs format \"3.6\""
1394 " with non-standard journal\n");
1395 else if (sb_version(rs) == REISERFS_VERSION_1)
1396 reiserfs_info(s, "found reiserfs format \"3.5\""
1397 " with non-standard journal\n");
1398 else {
1399 reiserfs_warning(s, "sh-2012", "found unknown "
1400 "format \"%u\" of reiserfs with "
1401 "non-standard magic", sb_version(rs));
1402 return 1;
1403 }
1404 } else
1405 /* s_version of standard format may contain incorrect information,
1406 so we just look at the magic string */
1407 reiserfs_info(s,
1408 "found reiserfs format \"%s\" with standard journal\n",
1409 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1410
1411 s->s_op = &reiserfs_sops;
1412 s->s_export_op = &reiserfs_export_ops;
1413 #ifdef CONFIG_QUOTA
1414 s->s_qcop = &reiserfs_qctl_operations;
1415 s->dq_op = &reiserfs_quota_operations;
1416 #endif
1417
1418 /* new format is limited by the 32 bit wide i_blocks field, want to
1419 ** be one full block below that.
1420 */
1421 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1422 return 0;
1423 }
1424
1425 /* after journal replay, reread all bitmap and super blocks */
1426 static int reread_meta_blocks(struct super_block *s)
1427 {
1428 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1429 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1430 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1431 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1432 return 1;
1433 }
1434
1435 return 0;
1436 }
1437
1438 /////////////////////////////////////////////////////
1439 // hash detection stuff
1440
1441 // if root directory is empty - we set default - Yura's - hash and
1442 // warn about it
1443 // FIXME: we look for only one name in a directory. If tea and yura
1444 // bith have the same value - we ask user to send report to the
1445 // mailing list
1446 static __u32 find_hash_out(struct super_block *s)
1447 {
1448 int retval;
1449 struct inode *inode;
1450 struct cpu_key key;
1451 INITIALIZE_PATH(path);
1452 struct reiserfs_dir_entry de;
1453 __u32 hash = DEFAULT_HASH;
1454
1455 inode = s->s_root->d_inode;
1456
1457 do { // Some serious "goto"-hater was there ;)
1458 u32 teahash, r5hash, yurahash;
1459
1460 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1461 retval = search_by_entry_key(s, &key, &path, &de);
1462 if (retval == IO_ERROR) {
1463 pathrelse(&path);
1464 return UNSET_HASH;
1465 }
1466 if (retval == NAME_NOT_FOUND)
1467 de.de_entry_num--;
1468 set_de_name_and_namelen(&de);
1469 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1470 /* allow override in this case */
1471 if (reiserfs_rupasov_hash(s)) {
1472 hash = YURA_HASH;
1473 }
1474 reiserfs_info(s, "FS seems to be empty, autodetect "
1475 "is using the default hash\n");
1476 break;
1477 }
1478 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1479 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1480 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1481 if (((teahash == r5hash)
1482 &&
1483 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1484 == r5hash)) || ((teahash == yurahash)
1485 && (yurahash ==
1486 GET_HASH_VALUE(deh_offset
1487 (&
1488 (de.
1489 de_deh[de.
1490 de_entry_num])))))
1491 || ((r5hash == yurahash)
1492 && (yurahash ==
1493 GET_HASH_VALUE(deh_offset
1494 (&(de.de_deh[de.de_entry_num])))))) {
1495 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1496 "automatically detect hash function. "
1497 "Please mount with -o "
1498 "hash={tea,rupasov,r5}");
1499 hash = UNSET_HASH;
1500 break;
1501 }
1502 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1503 yurahash)
1504 hash = YURA_HASH;
1505 else if (GET_HASH_VALUE
1506 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1507 hash = TEA_HASH;
1508 else if (GET_HASH_VALUE
1509 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1510 hash = R5_HASH;
1511 else {
1512 reiserfs_warning(s, "reiserfs-2506",
1513 "Unrecognised hash function");
1514 hash = UNSET_HASH;
1515 }
1516 } while (0);
1517
1518 pathrelse(&path);
1519 return hash;
1520 }
1521
1522 // finds out which hash names are sorted with
1523 static int what_hash(struct super_block *s)
1524 {
1525 __u32 code;
1526
1527 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1528
1529 /* reiserfs_hash_detect() == true if any of the hash mount options
1530 ** were used. We must check them to make sure the user isn't
1531 ** using a bad hash value
1532 */
1533 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1534 code = find_hash_out(s);
1535
1536 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1537 /* detection has found the hash, and we must check against the
1538 ** mount options
1539 */
1540 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1541 reiserfs_warning(s, "reiserfs-2507",
1542 "Error, %s hash detected, "
1543 "unable to force rupasov hash",
1544 reiserfs_hashname(code));
1545 code = UNSET_HASH;
1546 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1547 reiserfs_warning(s, "reiserfs-2508",
1548 "Error, %s hash detected, "
1549 "unable to force tea hash",
1550 reiserfs_hashname(code));
1551 code = UNSET_HASH;
1552 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1553 reiserfs_warning(s, "reiserfs-2509",
1554 "Error, %s hash detected, "
1555 "unable to force r5 hash",
1556 reiserfs_hashname(code));
1557 code = UNSET_HASH;
1558 }
1559 } else {
1560 /* find_hash_out was not called or could not determine the hash */
1561 if (reiserfs_rupasov_hash(s)) {
1562 code = YURA_HASH;
1563 } else if (reiserfs_tea_hash(s)) {
1564 code = TEA_HASH;
1565 } else if (reiserfs_r5_hash(s)) {
1566 code = R5_HASH;
1567 }
1568 }
1569
1570 /* if we are mounted RW, and we have a new valid hash code, update
1571 ** the super
1572 */
1573 if (code != UNSET_HASH &&
1574 !(s->s_flags & MS_RDONLY) &&
1575 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1576 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1577 }
1578 return code;
1579 }
1580
1581 // return pointer to appropriate function
1582 static hashf_t hash_function(struct super_block *s)
1583 {
1584 switch (what_hash(s)) {
1585 case TEA_HASH:
1586 reiserfs_info(s, "Using tea hash to sort names\n");
1587 return keyed_hash;
1588 case YURA_HASH:
1589 reiserfs_info(s, "Using rupasov hash to sort names\n");
1590 return yura_hash;
1591 case R5_HASH:
1592 reiserfs_info(s, "Using r5 hash to sort names\n");
1593 return r5_hash;
1594 }
1595 return NULL;
1596 }
1597
1598 // this is used to set up correct value for old partitions
1599 static int function2code(hashf_t func)
1600 {
1601 if (func == keyed_hash)
1602 return TEA_HASH;
1603 if (func == yura_hash)
1604 return YURA_HASH;
1605 if (func == r5_hash)
1606 return R5_HASH;
1607
1608 BUG(); // should never happen
1609
1610 return 0;
1611 }
1612
1613 #define SWARN(silent, s, id, ...) \
1614 if (!(silent)) \
1615 reiserfs_warning(s, id, __VA_ARGS__)
1616
1617 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1618 {
1619 struct inode *root_inode;
1620 struct reiserfs_transaction_handle th;
1621 int old_format = 0;
1622 unsigned long blocks;
1623 unsigned int commit_max_age = 0;
1624 int jinit_done = 0;
1625 struct reiserfs_iget_args args;
1626 struct reiserfs_super_block *rs;
1627 char *jdev_name;
1628 struct reiserfs_sb_info *sbi;
1629 int errval = -EINVAL;
1630 char *qf_names[MAXQUOTAS] = {};
1631 unsigned int qfmt = 0;
1632
1633 save_mount_options(s, data);
1634
1635 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1636 if (!sbi) {
1637 errval = -ENOMEM;
1638 goto error;
1639 }
1640 s->s_fs_info = sbi;
1641 /* Set default values for options: non-aggressive tails, RO on errors */
1642 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1643 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1644 /* no preallocation minimum, be smart in
1645 reiserfs_file_write instead */
1646 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1647 /* Preallocate by 16 blocks (17-1) at once */
1648 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1649 /* setup default block allocator options */
1650 reiserfs_init_alloc_options(s);
1651
1652 jdev_name = NULL;
1653 if (reiserfs_parse_options
1654 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1655 &commit_max_age, qf_names, &qfmt) == 0) {
1656 goto error;
1657 }
1658 #ifdef CONFIG_QUOTA
1659 handle_quota_files(s, qf_names, &qfmt);
1660 #endif
1661
1662 if (blocks) {
1663 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1664 goto error;
1665 }
1666
1667 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1668 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1669 old_format = 1;
1670 /* try new format (64-th 1k block), which can contain reiserfs super block */
1671 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1672 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1673 reiserfs_bdevname(s));
1674 goto error;
1675 }
1676
1677 rs = SB_DISK_SUPER_BLOCK(s);
1678 /* Let's do basic sanity check to verify that underlying device is not
1679 smaller than the filesystem. If the check fails then abort and scream,
1680 because bad stuff will happen otherwise. */
1681 if (s->s_bdev && s->s_bdev->bd_inode
1682 && i_size_read(s->s_bdev->bd_inode) <
1683 sb_block_count(rs) * sb_blocksize(rs)) {
1684 SWARN(silent, s, "", "Filesystem cannot be "
1685 "mounted because it is bigger than the device");
1686 SWARN(silent, s, "", "You may need to run fsck "
1687 "or increase size of your LVM partition");
1688 SWARN(silent, s, "", "Or may be you forgot to "
1689 "reboot after fdisk when it told you to");
1690 goto error;
1691 }
1692
1693 sbi->s_mount_state = SB_REISERFS_STATE(s);
1694 sbi->s_mount_state = REISERFS_VALID_FS;
1695
1696 if ((errval = reiserfs_init_bitmap_cache(s))) {
1697 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1698 goto error;
1699 }
1700 errval = -EINVAL;
1701 #ifdef CONFIG_REISERFS_CHECK
1702 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1703 SWARN(silent, s, "", "- it is slow mode for debugging.");
1704 #endif
1705
1706 /* make data=ordered the default */
1707 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1708 !reiserfs_data_writeback(s)) {
1709 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1710 }
1711
1712 if (reiserfs_data_log(s)) {
1713 reiserfs_info(s, "using journaled data mode\n");
1714 } else if (reiserfs_data_ordered(s)) {
1715 reiserfs_info(s, "using ordered data mode\n");
1716 } else {
1717 reiserfs_info(s, "using writeback data mode\n");
1718 }
1719 if (reiserfs_barrier_flush(s)) {
1720 printk("reiserfs: using flush barriers\n");
1721 }
1722 // set_device_ro(s->s_dev, 1) ;
1723 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1724 SWARN(silent, s, "sh-2022",
1725 "unable to initialize journal space");
1726 goto error;
1727 } else {
1728 jinit_done = 1; /* once this is set, journal_release must be called
1729 ** if we error out of the mount
1730 */
1731 }
1732 if (reread_meta_blocks(s)) {
1733 SWARN(silent, s, "jmacd-9",
1734 "unable to reread meta blocks after journal init");
1735 goto error;
1736 }
1737
1738 if (replay_only(s))
1739 goto error;
1740
1741 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1742 SWARN(silent, s, "clm-7000",
1743 "Detected readonly device, marking FS readonly");
1744 s->s_flags |= MS_RDONLY;
1745 }
1746 args.objectid = REISERFS_ROOT_OBJECTID;
1747 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1748 root_inode =
1749 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1750 reiserfs_init_locked_inode, (void *)(&args));
1751 if (!root_inode) {
1752 SWARN(silent, s, "jmacd-10", "get root inode failed");
1753 goto error;
1754 }
1755
1756 if (root_inode->i_state & I_NEW) {
1757 reiserfs_read_locked_inode(root_inode, &args);
1758 unlock_new_inode(root_inode);
1759 }
1760
1761 s->s_root = d_alloc_root(root_inode);
1762 if (!s->s_root) {
1763 iput(root_inode);
1764 goto error;
1765 }
1766 // define and initialize hash function
1767 sbi->s_hash_function = hash_function(s);
1768 if (sbi->s_hash_function == NULL) {
1769 dput(s->s_root);
1770 s->s_root = NULL;
1771 goto error;
1772 }
1773
1774 if (is_reiserfs_3_5(rs)
1775 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1776 set_bit(REISERFS_3_5, &(sbi->s_properties));
1777 else if (old_format)
1778 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1779 else
1780 set_bit(REISERFS_3_6, &(sbi->s_properties));
1781
1782 if (!(s->s_flags & MS_RDONLY)) {
1783
1784 errval = journal_begin(&th, s, 1);
1785 if (errval) {
1786 dput(s->s_root);
1787 s->s_root = NULL;
1788 goto error;
1789 }
1790 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1791
1792 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1793 set_sb_fs_state(rs, 0);
1794
1795 /* Clear out s_bmap_nr if it would wrap. We can handle this
1796 * case, but older revisions can't. This will cause the
1797 * file system to fail mount on those older implementations,
1798 * avoiding corruption. -jeffm */
1799 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1800 sb_bmap_nr(rs) != 0) {
1801 reiserfs_warning(s, "super-2030", "This file system "
1802 "claims to use %u bitmap blocks in "
1803 "its super block, but requires %u. "
1804 "Clearing to zero.", sb_bmap_nr(rs),
1805 reiserfs_bmap_count(s));
1806
1807 set_sb_bmap_nr(rs, 0);
1808 }
1809
1810 if (old_format_only(s)) {
1811 /* filesystem of format 3.5 either with standard or non-standard
1812 journal */
1813 if (convert_reiserfs(s)) {
1814 /* and -o conv is given */
1815 if (!silent)
1816 reiserfs_info(s,
1817 "converting 3.5 filesystem to the 3.6 format");
1818
1819 if (is_reiserfs_3_5(rs))
1820 /* put magic string of 3.6 format. 2.2 will not be able to
1821 mount this filesystem anymore */
1822 memcpy(rs->s_v1.s_magic,
1823 reiserfs_3_6_magic_string,
1824 sizeof
1825 (reiserfs_3_6_magic_string));
1826
1827 set_sb_version(rs, REISERFS_VERSION_2);
1828 reiserfs_convert_objectid_map_v1(s);
1829 set_bit(REISERFS_3_6, &(sbi->s_properties));
1830 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1831 } else if (!silent) {
1832 reiserfs_info(s, "using 3.5.x disk format\n");
1833 }
1834 } else
1835 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1836
1837
1838 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1839 errval = journal_end(&th, s, 1);
1840 if (errval) {
1841 dput(s->s_root);
1842 s->s_root = NULL;
1843 goto error;
1844 }
1845
1846 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1847 dput(s->s_root);
1848 s->s_root = NULL;
1849 goto error;
1850 }
1851
1852 /* look for files which were to be removed in previous session */
1853 finish_unfinished(s);
1854 } else {
1855 if (old_format_only(s) && !silent) {
1856 reiserfs_info(s, "using 3.5.x disk format\n");
1857 }
1858
1859 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1860 dput(s->s_root);
1861 s->s_root = NULL;
1862 goto error;
1863 }
1864 }
1865 // mark hash in super block: it could be unset. overwrite should be ok
1866 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1867
1868 handle_attrs(s);
1869
1870 reiserfs_proc_info_init(s);
1871
1872 init_waitqueue_head(&(sbi->s_wait));
1873 spin_lock_init(&sbi->bitmap_lock);
1874
1875 return (0);
1876
1877 error:
1878 if (jinit_done) { /* kill the commit thread, free journal ram */
1879 journal_release_error(NULL, s);
1880 }
1881
1882 reiserfs_free_bitmap_cache(s);
1883 if (SB_BUFFER_WITH_SB(s))
1884 brelse(SB_BUFFER_WITH_SB(s));
1885 #ifdef CONFIG_QUOTA
1886 {
1887 int j;
1888 for (j = 0; j < MAXQUOTAS; j++)
1889 kfree(qf_names[j]);
1890 }
1891 #endif
1892 kfree(sbi);
1893
1894 s->s_fs_info = NULL;
1895 return errval;
1896 }
1897
1898 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1899 {
1900 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1901
1902 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1903 buf->f_bfree = sb_free_blocks(rs);
1904 buf->f_bavail = buf->f_bfree;
1905 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1906 buf->f_bsize = dentry->d_sb->s_blocksize;
1907 /* changed to accommodate gcc folks. */
1908 buf->f_type = REISERFS_SUPER_MAGIC;
1909 return 0;
1910 }
1911
1912 #ifdef CONFIG_QUOTA
1913 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1914 {
1915 struct reiserfs_transaction_handle th;
1916 int ret, err;
1917
1918 /* We may create quota structure so we need to reserve enough blocks */
1919 reiserfs_write_lock(inode->i_sb);
1920 ret =
1921 journal_begin(&th, inode->i_sb,
1922 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1923 if (ret)
1924 goto out;
1925 ret = dquot_initialize(inode, type);
1926 err =
1927 journal_end(&th, inode->i_sb,
1928 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1929 if (!ret && err)
1930 ret = err;
1931 out:
1932 reiserfs_write_unlock(inode->i_sb);
1933 return ret;
1934 }
1935
1936 static int reiserfs_dquot_drop(struct inode *inode)
1937 {
1938 struct reiserfs_transaction_handle th;
1939 int ret, err;
1940
1941 /* We may delete quota structure so we need to reserve enough blocks */
1942 reiserfs_write_lock(inode->i_sb);
1943 ret =
1944 journal_begin(&th, inode->i_sb,
1945 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1946 if (ret) {
1947 /*
1948 * We call dquot_drop() anyway to at least release references
1949 * to quota structures so that umount does not hang.
1950 */
1951 dquot_drop(inode);
1952 goto out;
1953 }
1954 ret = dquot_drop(inode);
1955 err =
1956 journal_end(&th, inode->i_sb,
1957 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1958 if (!ret && err)
1959 ret = err;
1960 out:
1961 reiserfs_write_unlock(inode->i_sb);
1962 return ret;
1963 }
1964
1965 static int reiserfs_write_dquot(struct dquot *dquot)
1966 {
1967 struct reiserfs_transaction_handle th;
1968 int ret, err;
1969
1970 reiserfs_write_lock(dquot->dq_sb);
1971 ret =
1972 journal_begin(&th, dquot->dq_sb,
1973 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1974 if (ret)
1975 goto out;
1976 ret = dquot_commit(dquot);
1977 err =
1978 journal_end(&th, dquot->dq_sb,
1979 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1980 if (!ret && err)
1981 ret = err;
1982 out:
1983 reiserfs_write_unlock(dquot->dq_sb);
1984 return ret;
1985 }
1986
1987 static int reiserfs_acquire_dquot(struct dquot *dquot)
1988 {
1989 struct reiserfs_transaction_handle th;
1990 int ret, err;
1991
1992 reiserfs_write_lock(dquot->dq_sb);
1993 ret =
1994 journal_begin(&th, dquot->dq_sb,
1995 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1996 if (ret)
1997 goto out;
1998 ret = dquot_acquire(dquot);
1999 err =
2000 journal_end(&th, dquot->dq_sb,
2001 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2002 if (!ret && err)
2003 ret = err;
2004 out:
2005 reiserfs_write_unlock(dquot->dq_sb);
2006 return ret;
2007 }
2008
2009 static int reiserfs_release_dquot(struct dquot *dquot)
2010 {
2011 struct reiserfs_transaction_handle th;
2012 int ret, err;
2013
2014 reiserfs_write_lock(dquot->dq_sb);
2015 ret =
2016 journal_begin(&th, dquot->dq_sb,
2017 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2018 if (ret) {
2019 /* Release dquot anyway to avoid endless cycle in dqput() */
2020 dquot_release(dquot);
2021 goto out;
2022 }
2023 ret = dquot_release(dquot);
2024 err =
2025 journal_end(&th, dquot->dq_sb,
2026 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2027 if (!ret && err)
2028 ret = err;
2029 out:
2030 reiserfs_write_unlock(dquot->dq_sb);
2031 return ret;
2032 }
2033
2034 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2035 {
2036 /* Are we journaling quotas? */
2037 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2038 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2039 dquot_mark_dquot_dirty(dquot);
2040 return reiserfs_write_dquot(dquot);
2041 } else
2042 return dquot_mark_dquot_dirty(dquot);
2043 }
2044
2045 static int reiserfs_write_info(struct super_block *sb, int type)
2046 {
2047 struct reiserfs_transaction_handle th;
2048 int ret, err;
2049
2050 /* Data block + inode block */
2051 reiserfs_write_lock(sb);
2052 ret = journal_begin(&th, sb, 2);
2053 if (ret)
2054 goto out;
2055 ret = dquot_commit_info(sb, type);
2056 err = journal_end(&th, sb, 2);
2057 if (!ret && err)
2058 ret = err;
2059 out:
2060 reiserfs_write_unlock(sb);
2061 return ret;
2062 }
2063
2064 /*
2065 * Turn on quotas during mount time - we need to find the quota file and such...
2066 */
2067 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2068 {
2069 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2070 REISERFS_SB(sb)->s_jquota_fmt, type);
2071 }
2072
2073 /*
2074 * Standard function to be called on quota_on
2075 */
2076 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2077 char *name, int remount)
2078 {
2079 int err;
2080 struct path path;
2081 struct inode *inode;
2082 struct reiserfs_transaction_handle th;
2083
2084 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2085 return -EINVAL;
2086 /* No more checks needed? Path and format_id are bogus anyway... */
2087 if (remount)
2088 return vfs_quota_on(sb, type, format_id, name, 1);
2089 err = kern_path(name, LOOKUP_FOLLOW, &path);
2090 if (err)
2091 return err;
2092 /* Quotafile not on the same filesystem? */
2093 if (path.mnt->mnt_sb != sb) {
2094 err = -EXDEV;
2095 goto out;
2096 }
2097 inode = path.dentry->d_inode;
2098 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2099 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2100 err = reiserfs_unpack(inode, NULL);
2101 if (err) {
2102 reiserfs_warning(sb, "super-6520",
2103 "Unpacking tail of quota file failed"
2104 " (%d). Cannot turn on quotas.", err);
2105 err = -EINVAL;
2106 goto out;
2107 }
2108 mark_inode_dirty(inode);
2109 }
2110 /* Journaling quota? */
2111 if (REISERFS_SB(sb)->s_qf_names[type]) {
2112 /* Quotafile not of fs root? */
2113 if (path.dentry->d_parent != sb->s_root)
2114 reiserfs_warning(sb, "super-6521",
2115 "Quota file not on filesystem root. "
2116 "Journalled quota will not work.");
2117 }
2118
2119 /*
2120 * When we journal data on quota file, we have to flush journal to see
2121 * all updates to the file when we bypass pagecache...
2122 */
2123 if (reiserfs_file_data_log(inode)) {
2124 /* Just start temporary transaction and finish it */
2125 err = journal_begin(&th, sb, 1);
2126 if (err)
2127 goto out;
2128 err = journal_end_sync(&th, sb, 1);
2129 if (err)
2130 goto out;
2131 }
2132 err = vfs_quota_on_path(sb, type, format_id, &path);
2133 out:
2134 path_put(&path);
2135 return err;
2136 }
2137
2138 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2139 * acquiring the locks... As quota files are never truncated and quota code
2140 * itself serializes the operations (and noone else should touch the files)
2141 * we don't have to be afraid of races */
2142 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2143 size_t len, loff_t off)
2144 {
2145 struct inode *inode = sb_dqopt(sb)->files[type];
2146 unsigned long blk = off >> sb->s_blocksize_bits;
2147 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2148 size_t toread;
2149 struct buffer_head tmp_bh, *bh;
2150 loff_t i_size = i_size_read(inode);
2151
2152 if (off > i_size)
2153 return 0;
2154 if (off + len > i_size)
2155 len = i_size - off;
2156 toread = len;
2157 while (toread > 0) {
2158 tocopy =
2159 sb->s_blocksize - offset <
2160 toread ? sb->s_blocksize - offset : toread;
2161 tmp_bh.b_state = 0;
2162 /* Quota files are without tails so we can safely use this function */
2163 reiserfs_write_lock(sb);
2164 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2165 reiserfs_write_unlock(sb);
2166 if (err)
2167 return err;
2168 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2169 memset(data, 0, tocopy);
2170 else {
2171 bh = sb_bread(sb, tmp_bh.b_blocknr);
2172 if (!bh)
2173 return -EIO;
2174 memcpy(data, bh->b_data + offset, tocopy);
2175 brelse(bh);
2176 }
2177 offset = 0;
2178 toread -= tocopy;
2179 data += tocopy;
2180 blk++;
2181 }
2182 return len;
2183 }
2184
2185 /* Write to quotafile (we know the transaction is already started and has
2186 * enough credits) */
2187 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2188 const char *data, size_t len, loff_t off)
2189 {
2190 struct inode *inode = sb_dqopt(sb)->files[type];
2191 unsigned long blk = off >> sb->s_blocksize_bits;
2192 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2193 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2194 size_t towrite = len;
2195 struct buffer_head tmp_bh, *bh;
2196
2197 if (!current->journal_info) {
2198 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2199 " cancelled because transaction is not started.\n",
2200 (unsigned long long)off, (unsigned long long)len);
2201 return -EIO;
2202 }
2203 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2204 while (towrite > 0) {
2205 tocopy = sb->s_blocksize - offset < towrite ?
2206 sb->s_blocksize - offset : towrite;
2207 tmp_bh.b_state = 0;
2208 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2209 if (err)
2210 goto out;
2211 if (offset || tocopy != sb->s_blocksize)
2212 bh = sb_bread(sb, tmp_bh.b_blocknr);
2213 else
2214 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2215 if (!bh) {
2216 err = -EIO;
2217 goto out;
2218 }
2219 lock_buffer(bh);
2220 memcpy(bh->b_data + offset, data, tocopy);
2221 flush_dcache_page(bh->b_page);
2222 set_buffer_uptodate(bh);
2223 unlock_buffer(bh);
2224 reiserfs_prepare_for_journal(sb, bh, 1);
2225 journal_mark_dirty(current->journal_info, sb, bh);
2226 if (!journal_quota)
2227 reiserfs_add_ordered_list(inode, bh);
2228 brelse(bh);
2229 offset = 0;
2230 towrite -= tocopy;
2231 data += tocopy;
2232 blk++;
2233 }
2234 out:
2235 if (len == towrite) {
2236 mutex_unlock(&inode->i_mutex);
2237 return err;
2238 }
2239 if (inode->i_size < off + len - towrite)
2240 i_size_write(inode, off + len - towrite);
2241 inode->i_version++;
2242 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2243 mark_inode_dirty(inode);
2244 mutex_unlock(&inode->i_mutex);
2245 return len - towrite;
2246 }
2247
2248 #endif
2249
2250 static int get_super_block(struct file_system_type *fs_type,
2251 int flags, const char *dev_name,
2252 void *data, struct vfsmount *mnt)
2253 {
2254 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2255 mnt);
2256 }
2257
2258 static int __init init_reiserfs_fs(void)
2259 {
2260 int ret;
2261
2262 if ((ret = init_inodecache())) {
2263 return ret;
2264 }
2265
2266 reiserfs_proc_info_global_init();
2267 reiserfs_proc_register_global("version",
2268 reiserfs_global_version_in_proc);
2269
2270 ret = register_filesystem(&reiserfs_fs_type);
2271
2272 if (ret == 0) {
2273 return 0;
2274 }
2275
2276 reiserfs_proc_unregister_global("version");
2277 reiserfs_proc_info_global_done();
2278 destroy_inodecache();
2279
2280 return ret;
2281 }
2282
2283 static void __exit exit_reiserfs_fs(void)
2284 {
2285 reiserfs_proc_unregister_global("version");
2286 reiserfs_proc_info_global_done();
2287 unregister_filesystem(&reiserfs_fs_type);
2288 destroy_inodecache();
2289 }
2290
2291 struct file_system_type reiserfs_fs_type = {
2292 .owner = THIS_MODULE,
2293 .name = "reiserfs",
2294 .get_sb = get_super_block,
2295 .kill_sb = reiserfs_kill_sb,
2296 .fs_flags = FS_REQUIRES_DEV,
2297 };
2298
2299 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2300 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2301 MODULE_LICENSE("GPL");
2302
2303 module_init(init_reiserfs_fs);
2304 module_exit(exit_reiserfs_fs);
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