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[deliverable/linux.git] / fs / reiserfs / super.c
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30
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 vfs_dq_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_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 *, int);
637
638 static struct dquot_operations reiserfs_quota_operations = {
639 .initialize = dquot_initialize,
640 .drop = 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 .alloc_dquot = dquot_alloc,
652 .destroy_dquot = dquot_destroy,
653 };
654
655 static struct quotactl_ops reiserfs_qctl_operations = {
656 .quota_on = reiserfs_quota_on,
657 .quota_off = vfs_quota_off,
658 .quota_sync = vfs_quota_sync,
659 .get_info = vfs_get_dqinfo,
660 .set_info = vfs_set_dqinfo,
661 .get_dqblk = vfs_get_dqblk,
662 .set_dqblk = vfs_set_dqblk,
663 };
664 #endif
665
666 static const struct export_operations reiserfs_export_ops = {
667 .encode_fh = reiserfs_encode_fh,
668 .fh_to_dentry = reiserfs_fh_to_dentry,
669 .fh_to_parent = reiserfs_fh_to_parent,
670 .get_parent = reiserfs_get_parent,
671 };
672
673 /* this struct is used in reiserfs_getopt () for containing the value for those
674 mount options that have values rather than being toggles. */
675 typedef struct {
676 char *value;
677 int setmask; /* bitmask which is to set on mount_options bitmask when this
678 value is found, 0 is no bits are to be changed. */
679 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. This is
681 applied BEFORE setmask */
682 } arg_desc_t;
683
684 /* Set this bit in arg_required to allow empty arguments */
685 #define REISERFS_OPT_ALLOWEMPTY 31
686
687 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
688 mount options */
689 typedef struct {
690 char *option_name;
691 int arg_required; /* 0 if argument is not required, not 0 otherwise */
692 const arg_desc_t *values; /* list of values accepted by an option */
693 int setmask; /* bitmask which is to set on mount_options bitmask when this
694 value is found, 0 is no bits are to be changed. */
695 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
696 value is found, 0 is no bits are to be changed. This is
697 applied BEFORE setmask */
698 } opt_desc_t;
699
700 /* possible values for -o data= */
701 static const arg_desc_t logging_mode[] = {
702 {"ordered", 1 << REISERFS_DATA_ORDERED,
703 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
704 {"journal", 1 << REISERFS_DATA_LOG,
705 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
706 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
707 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
708 {.value = NULL}
709 };
710
711 /* possible values for -o barrier= */
712 static const arg_desc_t barrier_mode[] = {
713 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
714 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
715 {.value = NULL}
716 };
717
718 /* possible values for "-o block-allocator=" and bits which are to be set in
719 s_mount_opt of reiserfs specific part of in-core super block */
720 static const arg_desc_t balloc[] = {
721 {"noborder", 1 << REISERFS_NO_BORDER, 0},
722 {"border", 0, 1 << REISERFS_NO_BORDER},
723 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
724 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
725 {"test4", 1 << REISERFS_TEST4, 0},
726 {"notest4", 0, 1 << REISERFS_TEST4},
727 {NULL, 0, 0}
728 };
729
730 static const arg_desc_t tails[] = {
731 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
732 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
733 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
734 {NULL, 0, 0}
735 };
736
737 static const arg_desc_t error_actions[] = {
738 {"panic", 1 << REISERFS_ERROR_PANIC,
739 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
740 {"ro-remount", 1 << REISERFS_ERROR_RO,
741 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
742 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
743 {"continue", 1 << REISERFS_ERROR_CONTINUE,
744 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
745 #endif
746 {NULL, 0, 0},
747 };
748
749 /* proceed only one option from a list *cur - string containing of mount options
750 opts - array of options which are accepted
751 opt_arg - if option is found and requires an argument and if it is specifed
752 in the input - pointer to the argument is stored here
753 bit_flags - if option requires to set a certain bit - it is set here
754 return -1 if unknown option is found, opt->arg_required otherwise */
755 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
756 char **opt_arg, unsigned long *bit_flags)
757 {
758 char *p;
759 /* foo=bar,
760 ^ ^ ^
761 | | +-- option_end
762 | +-- arg_start
763 +-- option_start
764 */
765 const opt_desc_t *opt;
766 const arg_desc_t *arg;
767
768 p = *cur;
769
770 /* assume argument cannot contain commas */
771 *cur = strchr(p, ',');
772 if (*cur) {
773 *(*cur) = '\0';
774 (*cur)++;
775 }
776
777 if (!strncmp(p, "alloc=", 6)) {
778 /* Ugly special case, probably we should redo options parser so that
779 it can understand several arguments for some options, also so that
780 it can fill several bitfields with option values. */
781 if (reiserfs_parse_alloc_options(s, p + 6)) {
782 return -1;
783 } else {
784 return 0;
785 }
786 }
787
788 /* for every option in the list */
789 for (opt = opts; opt->option_name; opt++) {
790 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
791 if (bit_flags) {
792 if (opt->clrmask ==
793 (1 << REISERFS_UNSUPPORTED_OPT))
794 reiserfs_warning(s, "super-6500",
795 "%s not supported.\n",
796 p);
797 else
798 *bit_flags &= ~opt->clrmask;
799 if (opt->setmask ==
800 (1 << REISERFS_UNSUPPORTED_OPT))
801 reiserfs_warning(s, "super-6501",
802 "%s not supported.\n",
803 p);
804 else
805 *bit_flags |= opt->setmask;
806 }
807 break;
808 }
809 }
810 if (!opt->option_name) {
811 reiserfs_warning(s, "super-6502",
812 "unknown mount option \"%s\"", p);
813 return -1;
814 }
815
816 p += strlen(opt->option_name);
817 switch (*p) {
818 case '=':
819 if (!opt->arg_required) {
820 reiserfs_warning(s, "super-6503",
821 "the option \"%s\" does not "
822 "require an argument\n",
823 opt->option_name);
824 return -1;
825 }
826 break;
827
828 case 0:
829 if (opt->arg_required) {
830 reiserfs_warning(s, "super-6504",
831 "the option \"%s\" requires an "
832 "argument\n", opt->option_name);
833 return -1;
834 }
835 break;
836 default:
837 reiserfs_warning(s, "super-6505",
838 "head of option \"%s\" is only correct\n",
839 opt->option_name);
840 return -1;
841 }
842
843 /* move to the argument, or to next option if argument is not required */
844 p++;
845
846 if (opt->arg_required
847 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
848 && !strlen(p)) {
849 /* this catches "option=," if not allowed */
850 reiserfs_warning(s, "super-6506",
851 "empty argument for \"%s\"\n",
852 opt->option_name);
853 return -1;
854 }
855
856 if (!opt->values) {
857 /* *=NULLopt_arg contains pointer to argument */
858 *opt_arg = p;
859 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
860 }
861
862 /* values possible for this option are listed in opt->values */
863 for (arg = opt->values; arg->value; arg++) {
864 if (!strcmp(p, arg->value)) {
865 if (bit_flags) {
866 *bit_flags &= ~arg->clrmask;
867 *bit_flags |= arg->setmask;
868 }
869 return opt->arg_required;
870 }
871 }
872
873 reiserfs_warning(s, "super-6506",
874 "bad value \"%s\" for option \"%s\"\n", p,
875 opt->option_name);
876 return -1;
877 }
878
879 /* returns 0 if something is wrong in option string, 1 - otherwise */
880 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
881 unsigned long *mount_options,
882 /* after the parsing phase, contains the
883 collection of bitflags defining what
884 mount options were selected. */
885 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
886 char **jdev_name,
887 unsigned int *commit_max_age,
888 char **qf_names,
889 unsigned int *qfmt)
890 {
891 int c;
892 char *arg = NULL;
893 char *pos;
894 opt_desc_t opts[] = {
895 /* Compatibility stuff, so that -o notail for old setups still work */
896 {"tails",.arg_required = 't',.values = tails},
897 {"notail",.clrmask =
898 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
899 {"conv",.setmask = 1 << REISERFS_CONVERT},
900 {"attrs",.setmask = 1 << REISERFS_ATTRS},
901 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
902 #ifdef CONFIG_REISERFS_FS_XATTR
903 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
904 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
905 #else
906 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
907 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 #endif
909 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
910 {"acl",.setmask = 1 << REISERFS_POSIXACL},
911 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
912 #else
913 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
914 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
915 #endif
916 {.option_name = "nolog"},
917 {"replayonly",.setmask = 1 << REPLAYONLY},
918 {"block-allocator",.arg_required = 'a',.values = balloc},
919 {"data",.arg_required = 'd',.values = logging_mode},
920 {"barrier",.arg_required = 'b',.values = barrier_mode},
921 {"resize",.arg_required = 'r',.values = NULL},
922 {"jdev",.arg_required = 'j',.values = NULL},
923 {"nolargeio",.arg_required = 'w',.values = NULL},
924 {"commit",.arg_required = 'c',.values = NULL},
925 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
926 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
927 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
928 {"errors",.arg_required = 'e',.values = error_actions},
929 {"usrjquota",.arg_required =
930 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
931 {"grpjquota",.arg_required =
932 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
933 {"jqfmt",.arg_required = 'f',.values = NULL},
934 {.option_name = NULL}
935 };
936
937 *blocks = 0;
938 if (!options || !*options)
939 /* use default configuration: create tails, journaling on, no
940 conversion to newest format */
941 return 1;
942
943 for (pos = options; pos;) {
944 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
945 if (c == -1)
946 /* wrong option is given */
947 return 0;
948
949 if (c == 'r') {
950 char *p;
951
952 p = NULL;
953 /* "resize=NNN" or "resize=auto" */
954
955 if (!strcmp(arg, "auto")) {
956 /* From JFS code, to auto-get the size. */
957 *blocks =
958 s->s_bdev->bd_inode->i_size >> s->
959 s_blocksize_bits;
960 } else {
961 *blocks = simple_strtoul(arg, &p, 0);
962 if (*p != '\0') {
963 /* NNN does not look like a number */
964 reiserfs_warning(s, "super-6507",
965 "bad value %s for "
966 "-oresize\n", arg);
967 return 0;
968 }
969 }
970 }
971
972 if (c == 'c') {
973 char *p = NULL;
974 unsigned long val = simple_strtoul(arg, &p, 0);
975 /* commit=NNN (time in seconds) */
976 if (*p != '\0' || val >= (unsigned int)-1) {
977 reiserfs_warning(s, "super-6508",
978 "bad value %s for -ocommit\n",
979 arg);
980 return 0;
981 }
982 *commit_max_age = (unsigned int)val;
983 }
984
985 if (c == 'w') {
986 reiserfs_warning(s, "super-6509", "nolargeio option "
987 "is no longer supported");
988 return 0;
989 }
990
991 if (c == 'j') {
992 if (arg && *arg && jdev_name) {
993 if (*jdev_name) { //Hm, already assigned?
994 reiserfs_warning(s, "super-6510",
995 "journal device was "
996 "already specified to "
997 "be %s", *jdev_name);
998 return 0;
999 }
1000 *jdev_name = arg;
1001 }
1002 }
1003 #ifdef CONFIG_QUOTA
1004 if (c == 'u' || c == 'g') {
1005 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1006
1007 if (sb_any_quota_loaded(s) &&
1008 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1009 reiserfs_warning(s, "super-6511",
1010 "cannot change journaled "
1011 "quota options when quota "
1012 "turned on.");
1013 return 0;
1014 }
1015 if (*arg) { /* Some filename specified? */
1016 if (REISERFS_SB(s)->s_qf_names[qtype]
1017 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1018 arg)) {
1019 reiserfs_warning(s, "super-6512",
1020 "%s quota file "
1021 "already specified.",
1022 QTYPE2NAME(qtype));
1023 return 0;
1024 }
1025 if (strchr(arg, '/')) {
1026 reiserfs_warning(s, "super-6513",
1027 "quotafile must be "
1028 "on filesystem root.");
1029 return 0;
1030 }
1031 qf_names[qtype] =
1032 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1033 if (!qf_names[qtype]) {
1034 reiserfs_warning(s, "reiserfs-2502",
1035 "not enough memory "
1036 "for storing "
1037 "quotafile name.");
1038 return 0;
1039 }
1040 strcpy(qf_names[qtype], arg);
1041 *mount_options |= 1 << REISERFS_QUOTA;
1042 } else {
1043 if (qf_names[qtype] !=
1044 REISERFS_SB(s)->s_qf_names[qtype])
1045 kfree(qf_names[qtype]);
1046 qf_names[qtype] = NULL;
1047 }
1048 }
1049 if (c == 'f') {
1050 if (!strcmp(arg, "vfsold"))
1051 *qfmt = QFMT_VFS_OLD;
1052 else if (!strcmp(arg, "vfsv0"))
1053 *qfmt = QFMT_VFS_V0;
1054 else {
1055 reiserfs_warning(s, "super-6514",
1056 "unknown quota format "
1057 "specified.");
1058 return 0;
1059 }
1060 if (sb_any_quota_loaded(s) &&
1061 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1062 reiserfs_warning(s, "super-6515",
1063 "cannot change journaled "
1064 "quota options when quota "
1065 "turned on.");
1066 return 0;
1067 }
1068 }
1069 #else
1070 if (c == 'u' || c == 'g' || c == 'f') {
1071 reiserfs_warning(s, "reiserfs-2503", "journaled "
1072 "quota options not supported.");
1073 return 0;
1074 }
1075 #endif
1076 }
1077
1078 #ifdef CONFIG_QUOTA
1079 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1080 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1081 reiserfs_warning(s, "super-6515",
1082 "journaled quota format not specified.");
1083 return 0;
1084 }
1085 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1086 if (!(*mount_options & (1 << REISERFS_QUOTA))
1087 && sb_any_quota_loaded(s)) {
1088 reiserfs_warning(s, "super-6516", "quota options must "
1089 "be present when quota is turned on.");
1090 return 0;
1091 }
1092 #endif
1093
1094 return 1;
1095 }
1096
1097 static void switch_data_mode(struct super_block *s, unsigned long mode)
1098 {
1099 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1100 (1 << REISERFS_DATA_ORDERED) |
1101 (1 << REISERFS_DATA_WRITEBACK));
1102 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1103 }
1104
1105 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1106 {
1107 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1108 if (!reiserfs_data_log(s)) {
1109 switch_data_mode(s, REISERFS_DATA_LOG);
1110 reiserfs_info(s, "switching to journaled data mode\n");
1111 }
1112 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1113 if (!reiserfs_data_ordered(s)) {
1114 switch_data_mode(s, REISERFS_DATA_ORDERED);
1115 reiserfs_info(s, "switching to ordered data mode\n");
1116 }
1117 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1118 if (!reiserfs_data_writeback(s)) {
1119 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1120 reiserfs_info(s, "switching to writeback data mode\n");
1121 }
1122 }
1123 }
1124
1125 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1126 {
1127 int flush = (1 << REISERFS_BARRIER_FLUSH);
1128 int none = (1 << REISERFS_BARRIER_NONE);
1129 int all_barrier = flush | none;
1130
1131 if (bits & all_barrier) {
1132 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1133 if (bits & flush) {
1134 REISERFS_SB(s)->s_mount_opt |= flush;
1135 printk("reiserfs: enabling write barrier flush mode\n");
1136 } else if (bits & none) {
1137 REISERFS_SB(s)->s_mount_opt |= none;
1138 printk("reiserfs: write barriers turned off\n");
1139 }
1140 }
1141 }
1142
1143 static void handle_attrs(struct super_block *s)
1144 {
1145 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1146
1147 if (reiserfs_attrs(s)) {
1148 if (old_format_only(s)) {
1149 reiserfs_warning(s, "super-6517", "cannot support "
1150 "attributes on 3.5.x disk format");
1151 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1152 return;
1153 }
1154 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1155 reiserfs_warning(s, "super-6518", "cannot support "
1156 "attributes until flag is set in "
1157 "super-block");
1158 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1159 }
1160 }
1161 }
1162
1163 #ifdef CONFIG_QUOTA
1164 static void handle_quota_files(struct super_block *s, char **qf_names,
1165 unsigned int *qfmt)
1166 {
1167 int i;
1168
1169 for (i = 0; i < MAXQUOTAS; i++) {
1170 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1171 kfree(REISERFS_SB(s)->s_qf_names[i]);
1172 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1173 }
1174 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1175 }
1176 #endif
1177
1178 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1179 {
1180 struct reiserfs_super_block *rs;
1181 struct reiserfs_transaction_handle th;
1182 unsigned long blocks;
1183 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1184 unsigned long safe_mask = 0;
1185 unsigned int commit_max_age = (unsigned int)-1;
1186 struct reiserfs_journal *journal = SB_JOURNAL(s);
1187 char *new_opts = kstrdup(arg, GFP_KERNEL);
1188 int err;
1189 char *qf_names[MAXQUOTAS];
1190 unsigned int qfmt = 0;
1191 #ifdef CONFIG_QUOTA
1192 int i;
1193
1194 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1195 #endif
1196
1197 rs = SB_DISK_SUPER_BLOCK(s);
1198
1199 if (!reiserfs_parse_options
1200 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1201 qf_names, &qfmt)) {
1202 #ifdef CONFIG_QUOTA
1203 for (i = 0; i < MAXQUOTAS; i++)
1204 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1205 kfree(qf_names[i]);
1206 #endif
1207 err = -EINVAL;
1208 goto out_err;
1209 }
1210 #ifdef CONFIG_QUOTA
1211 handle_quota_files(s, qf_names, &qfmt);
1212 #endif
1213
1214 handle_attrs(s);
1215
1216 /* Add options that are safe here */
1217 safe_mask |= 1 << REISERFS_SMALLTAIL;
1218 safe_mask |= 1 << REISERFS_LARGETAIL;
1219 safe_mask |= 1 << REISERFS_NO_BORDER;
1220 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1221 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1222 safe_mask |= 1 << REISERFS_TEST4;
1223 safe_mask |= 1 << REISERFS_ATTRS;
1224 safe_mask |= 1 << REISERFS_XATTRS_USER;
1225 safe_mask |= 1 << REISERFS_POSIXACL;
1226 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1227 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1228 safe_mask |= 1 << REISERFS_ERROR_RO;
1229 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1230 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1231 safe_mask |= 1 << REISERFS_QUOTA;
1232
1233 /* Update the bitmask, taking care to keep
1234 * the bits we're not allowed to change here */
1235 REISERFS_SB(s)->s_mount_opt =
1236 (REISERFS_SB(s)->
1237 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1238
1239 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1240 journal->j_max_commit_age = commit_max_age;
1241 journal->j_max_trans_age = commit_max_age;
1242 } else if (commit_max_age == 0) {
1243 /* 0 means restore defaults. */
1244 journal->j_max_commit_age = journal->j_default_max_commit_age;
1245 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1246 }
1247
1248 if (blocks) {
1249 err = reiserfs_resize(s, blocks);
1250 if (err != 0)
1251 goto out_err;
1252 }
1253
1254 if (*mount_flags & MS_RDONLY) {
1255 reiserfs_xattr_init(s, *mount_flags);
1256 /* remount read-only */
1257 if (s->s_flags & MS_RDONLY)
1258 /* it is read-only already */
1259 goto out_ok;
1260 /* try to remount file system with read-only permissions */
1261 if (sb_umount_state(rs) == REISERFS_VALID_FS
1262 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1263 goto out_ok;
1264 }
1265
1266 err = journal_begin(&th, s, 10);
1267 if (err)
1268 goto out_err;
1269
1270 /* Mounting a rw partition read-only. */
1271 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1272 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1273 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1274 } else {
1275 /* remount read-write */
1276 if (!(s->s_flags & MS_RDONLY)) {
1277 reiserfs_xattr_init(s, *mount_flags);
1278 goto out_ok; /* We are read-write already */
1279 }
1280
1281 if (reiserfs_is_journal_aborted(journal)) {
1282 err = journal->j_errno;
1283 goto out_err;
1284 }
1285
1286 handle_data_mode(s, mount_options);
1287 handle_barrier_mode(s, mount_options);
1288 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1289 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1290 err = journal_begin(&th, s, 10);
1291 if (err)
1292 goto out_err;
1293
1294 /* Mount a partition which is read-only, read-write */
1295 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1296 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1297 s->s_flags &= ~MS_RDONLY;
1298 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1299 if (!old_format_only(s))
1300 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1301 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1302 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1303 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1304 }
1305 /* this will force a full flush of all journal lists */
1306 SB_JOURNAL(s)->j_must_wait = 1;
1307 err = journal_end(&th, s, 10);
1308 if (err)
1309 goto out_err;
1310 s->s_dirt = 0;
1311
1312 if (!(*mount_flags & MS_RDONLY)) {
1313 finish_unfinished(s);
1314 reiserfs_xattr_init(s, *mount_flags);
1315 }
1316
1317 out_ok:
1318 kfree(s->s_options);
1319 s->s_options = new_opts;
1320 return 0;
1321
1322 out_err:
1323 kfree(new_opts);
1324 return err;
1325 }
1326
1327 static int read_super_block(struct super_block *s, int offset)
1328 {
1329 struct buffer_head *bh;
1330 struct reiserfs_super_block *rs;
1331 int fs_blocksize;
1332
1333 bh = sb_bread(s, offset / s->s_blocksize);
1334 if (!bh) {
1335 reiserfs_warning(s, "sh-2006",
1336 "bread failed (dev %s, block %lu, size %lu)",
1337 reiserfs_bdevname(s), offset / s->s_blocksize,
1338 s->s_blocksize);
1339 return 1;
1340 }
1341
1342 rs = (struct reiserfs_super_block *)bh->b_data;
1343 if (!is_any_reiserfs_magic_string(rs)) {
1344 brelse(bh);
1345 return 1;
1346 }
1347 //
1348 // ok, reiserfs signature (old or new) found in at the given offset
1349 //
1350 fs_blocksize = sb_blocksize(rs);
1351 brelse(bh);
1352 sb_set_blocksize(s, fs_blocksize);
1353
1354 bh = sb_bread(s, offset / s->s_blocksize);
1355 if (!bh) {
1356 reiserfs_warning(s, "sh-2007",
1357 "bread failed (dev %s, block %lu, size %lu)",
1358 reiserfs_bdevname(s), offset / s->s_blocksize,
1359 s->s_blocksize);
1360 return 1;
1361 }
1362
1363 rs = (struct reiserfs_super_block *)bh->b_data;
1364 if (sb_blocksize(rs) != s->s_blocksize) {
1365 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1366 "filesystem on (dev %s, block %Lu, size %lu)",
1367 reiserfs_bdevname(s),
1368 (unsigned long long)bh->b_blocknr,
1369 s->s_blocksize);
1370 brelse(bh);
1371 return 1;
1372 }
1373
1374 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1375 brelse(bh);
1376 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1377 "--rebuild-tree run detected. Please run\n"
1378 "reiserfsck --rebuild-tree and wait for a "
1379 "completion. If that fails\n"
1380 "get newer reiserfsprogs package");
1381 return 1;
1382 }
1383
1384 SB_BUFFER_WITH_SB(s) = bh;
1385 SB_DISK_SUPER_BLOCK(s) = rs;
1386
1387 if (is_reiserfs_jr(rs)) {
1388 /* magic is of non-standard journal filesystem, look at s_version to
1389 find which format is in use */
1390 if (sb_version(rs) == REISERFS_VERSION_2)
1391 reiserfs_info(s, "found reiserfs format \"3.6\""
1392 " with non-standard journal\n");
1393 else if (sb_version(rs) == REISERFS_VERSION_1)
1394 reiserfs_info(s, "found reiserfs format \"3.5\""
1395 " with non-standard journal\n");
1396 else {
1397 reiserfs_warning(s, "sh-2012", "found unknown "
1398 "format \"%u\" of reiserfs with "
1399 "non-standard magic", sb_version(rs));
1400 return 1;
1401 }
1402 } else
1403 /* s_version of standard format may contain incorrect information,
1404 so we just look at the magic string */
1405 reiserfs_info(s,
1406 "found reiserfs format \"%s\" with standard journal\n",
1407 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1408
1409 s->s_op = &reiserfs_sops;
1410 s->s_export_op = &reiserfs_export_ops;
1411 #ifdef CONFIG_QUOTA
1412 s->s_qcop = &reiserfs_qctl_operations;
1413 s->dq_op = &reiserfs_quota_operations;
1414 #endif
1415
1416 /* new format is limited by the 32 bit wide i_blocks field, want to
1417 ** be one full block below that.
1418 */
1419 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1420 return 0;
1421 }
1422
1423 /* after journal replay, reread all bitmap and super blocks */
1424 static int reread_meta_blocks(struct super_block *s)
1425 {
1426 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1427 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1428 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1429 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1430 return 1;
1431 }
1432
1433 return 0;
1434 }
1435
1436 /////////////////////////////////////////////////////
1437 // hash detection stuff
1438
1439 // if root directory is empty - we set default - Yura's - hash and
1440 // warn about it
1441 // FIXME: we look for only one name in a directory. If tea and yura
1442 // bith have the same value - we ask user to send report to the
1443 // mailing list
1444 static __u32 find_hash_out(struct super_block *s)
1445 {
1446 int retval;
1447 struct inode *inode;
1448 struct cpu_key key;
1449 INITIALIZE_PATH(path);
1450 struct reiserfs_dir_entry de;
1451 __u32 hash = DEFAULT_HASH;
1452
1453 inode = s->s_root->d_inode;
1454
1455 do { // Some serious "goto"-hater was there ;)
1456 u32 teahash, r5hash, yurahash;
1457
1458 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1459 retval = search_by_entry_key(s, &key, &path, &de);
1460 if (retval == IO_ERROR) {
1461 pathrelse(&path);
1462 return UNSET_HASH;
1463 }
1464 if (retval == NAME_NOT_FOUND)
1465 de.de_entry_num--;
1466 set_de_name_and_namelen(&de);
1467 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1468 /* allow override in this case */
1469 if (reiserfs_rupasov_hash(s)) {
1470 hash = YURA_HASH;
1471 }
1472 reiserfs_info(s, "FS seems to be empty, autodetect "
1473 "is using the default hash\n");
1474 break;
1475 }
1476 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1477 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1478 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1479 if (((teahash == r5hash)
1480 &&
1481 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1482 == r5hash)) || ((teahash == yurahash)
1483 && (yurahash ==
1484 GET_HASH_VALUE(deh_offset
1485 (&
1486 (de.
1487 de_deh[de.
1488 de_entry_num])))))
1489 || ((r5hash == yurahash)
1490 && (yurahash ==
1491 GET_HASH_VALUE(deh_offset
1492 (&(de.de_deh[de.de_entry_num])))))) {
1493 reiserfs_warning(s, "reiserfs-2506", "Unable to "
1494 "automatically detect hash function. "
1495 "Please mount with -o "
1496 "hash={tea,rupasov,r5}");
1497 hash = UNSET_HASH;
1498 break;
1499 }
1500 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1501 yurahash)
1502 hash = YURA_HASH;
1503 else if (GET_HASH_VALUE
1504 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1505 hash = TEA_HASH;
1506 else if (GET_HASH_VALUE
1507 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1508 hash = R5_HASH;
1509 else {
1510 reiserfs_warning(s, "reiserfs-2506",
1511 "Unrecognised hash function");
1512 hash = UNSET_HASH;
1513 }
1514 } while (0);
1515
1516 pathrelse(&path);
1517 return hash;
1518 }
1519
1520 // finds out which hash names are sorted with
1521 static int what_hash(struct super_block *s)
1522 {
1523 __u32 code;
1524
1525 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1526
1527 /* reiserfs_hash_detect() == true if any of the hash mount options
1528 ** were used. We must check them to make sure the user isn't
1529 ** using a bad hash value
1530 */
1531 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1532 code = find_hash_out(s);
1533
1534 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1535 /* detection has found the hash, and we must check against the
1536 ** mount options
1537 */
1538 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1539 reiserfs_warning(s, "reiserfs-2507",
1540 "Error, %s hash detected, "
1541 "unable to force rupasov hash",
1542 reiserfs_hashname(code));
1543 code = UNSET_HASH;
1544 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1545 reiserfs_warning(s, "reiserfs-2508",
1546 "Error, %s hash detected, "
1547 "unable to force tea hash",
1548 reiserfs_hashname(code));
1549 code = UNSET_HASH;
1550 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1551 reiserfs_warning(s, "reiserfs-2509",
1552 "Error, %s hash detected, "
1553 "unable to force r5 hash",
1554 reiserfs_hashname(code));
1555 code = UNSET_HASH;
1556 }
1557 } else {
1558 /* find_hash_out was not called or could not determine the hash */
1559 if (reiserfs_rupasov_hash(s)) {
1560 code = YURA_HASH;
1561 } else if (reiserfs_tea_hash(s)) {
1562 code = TEA_HASH;
1563 } else if (reiserfs_r5_hash(s)) {
1564 code = R5_HASH;
1565 }
1566 }
1567
1568 /* if we are mounted RW, and we have a new valid hash code, update
1569 ** the super
1570 */
1571 if (code != UNSET_HASH &&
1572 !(s->s_flags & MS_RDONLY) &&
1573 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1574 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1575 }
1576 return code;
1577 }
1578
1579 // return pointer to appropriate function
1580 static hashf_t hash_function(struct super_block *s)
1581 {
1582 switch (what_hash(s)) {
1583 case TEA_HASH:
1584 reiserfs_info(s, "Using tea hash to sort names\n");
1585 return keyed_hash;
1586 case YURA_HASH:
1587 reiserfs_info(s, "Using rupasov hash to sort names\n");
1588 return yura_hash;
1589 case R5_HASH:
1590 reiserfs_info(s, "Using r5 hash to sort names\n");
1591 return r5_hash;
1592 }
1593 return NULL;
1594 }
1595
1596 // this is used to set up correct value for old partitions
1597 static int function2code(hashf_t func)
1598 {
1599 if (func == keyed_hash)
1600 return TEA_HASH;
1601 if (func == yura_hash)
1602 return YURA_HASH;
1603 if (func == r5_hash)
1604 return R5_HASH;
1605
1606 BUG(); // should never happen
1607
1608 return 0;
1609 }
1610
1611 #define SWARN(silent, s, id, ...) \
1612 if (!(silent)) \
1613 reiserfs_warning(s, id, __VA_ARGS__)
1614
1615 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1616 {
1617 struct inode *root_inode;
1618 struct reiserfs_transaction_handle th;
1619 int old_format = 0;
1620 unsigned long blocks;
1621 unsigned int commit_max_age = 0;
1622 int jinit_done = 0;
1623 struct reiserfs_iget_args args;
1624 struct reiserfs_super_block *rs;
1625 char *jdev_name;
1626 struct reiserfs_sb_info *sbi;
1627 int errval = -EINVAL;
1628 char *qf_names[MAXQUOTAS] = {};
1629 unsigned int qfmt = 0;
1630
1631 save_mount_options(s, data);
1632
1633 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1634 if (!sbi) {
1635 errval = -ENOMEM;
1636 goto error;
1637 }
1638 s->s_fs_info = sbi;
1639 /* Set default values for options: non-aggressive tails, RO on errors */
1640 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1641 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1642 /* no preallocation minimum, be smart in
1643 reiserfs_file_write instead */
1644 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1645 /* Preallocate by 16 blocks (17-1) at once */
1646 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1647 /* setup default block allocator options */
1648 reiserfs_init_alloc_options(s);
1649
1650 jdev_name = NULL;
1651 if (reiserfs_parse_options
1652 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1653 &commit_max_age, qf_names, &qfmt) == 0) {
1654 goto error;
1655 }
1656 #ifdef CONFIG_QUOTA
1657 handle_quota_files(s, qf_names, &qfmt);
1658 #endif
1659
1660 if (blocks) {
1661 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1662 goto error;
1663 }
1664
1665 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1666 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1667 old_format = 1;
1668 /* try new format (64-th 1k block), which can contain reiserfs super block */
1669 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1670 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1671 reiserfs_bdevname(s));
1672 goto error;
1673 }
1674
1675 rs = SB_DISK_SUPER_BLOCK(s);
1676 /* Let's do basic sanity check to verify that underlying device is not
1677 smaller than the filesystem. If the check fails then abort and scream,
1678 because bad stuff will happen otherwise. */
1679 if (s->s_bdev && s->s_bdev->bd_inode
1680 && i_size_read(s->s_bdev->bd_inode) <
1681 sb_block_count(rs) * sb_blocksize(rs)) {
1682 SWARN(silent, s, "", "Filesystem cannot be "
1683 "mounted because it is bigger than the device");
1684 SWARN(silent, s, "", "You may need to run fsck "
1685 "or increase size of your LVM partition");
1686 SWARN(silent, s, "", "Or may be you forgot to "
1687 "reboot after fdisk when it told you to");
1688 goto error;
1689 }
1690
1691 sbi->s_mount_state = SB_REISERFS_STATE(s);
1692 sbi->s_mount_state = REISERFS_VALID_FS;
1693
1694 if ((errval = reiserfs_init_bitmap_cache(s))) {
1695 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1696 goto error;
1697 }
1698 errval = -EINVAL;
1699 #ifdef CONFIG_REISERFS_CHECK
1700 SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1701 SWARN(silent, s, "", "- it is slow mode for debugging.");
1702 #endif
1703
1704 /* make data=ordered the default */
1705 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1706 !reiserfs_data_writeback(s)) {
1707 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1708 }
1709
1710 if (reiserfs_data_log(s)) {
1711 reiserfs_info(s, "using journaled data mode\n");
1712 } else if (reiserfs_data_ordered(s)) {
1713 reiserfs_info(s, "using ordered data mode\n");
1714 } else {
1715 reiserfs_info(s, "using writeback data mode\n");
1716 }
1717 if (reiserfs_barrier_flush(s)) {
1718 printk("reiserfs: using flush barriers\n");
1719 }
1720 // set_device_ro(s->s_dev, 1) ;
1721 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1722 SWARN(silent, s, "sh-2022",
1723 "unable to initialize journal space");
1724 goto error;
1725 } else {
1726 jinit_done = 1; /* once this is set, journal_release must be called
1727 ** if we error out of the mount
1728 */
1729 }
1730 if (reread_meta_blocks(s)) {
1731 SWARN(silent, s, "jmacd-9",
1732 "unable to reread meta blocks after journal init");
1733 goto error;
1734 }
1735
1736 if (replay_only(s))
1737 goto error;
1738
1739 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1740 SWARN(silent, s, "clm-7000",
1741 "Detected readonly device, marking FS readonly");
1742 s->s_flags |= MS_RDONLY;
1743 }
1744 args.objectid = REISERFS_ROOT_OBJECTID;
1745 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1746 root_inode =
1747 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1748 reiserfs_init_locked_inode, (void *)(&args));
1749 if (!root_inode) {
1750 SWARN(silent, s, "jmacd-10", "get root inode failed");
1751 goto error;
1752 }
1753
1754 if (root_inode->i_state & I_NEW) {
1755 reiserfs_read_locked_inode(root_inode, &args);
1756 unlock_new_inode(root_inode);
1757 }
1758
1759 s->s_root = d_alloc_root(root_inode);
1760 if (!s->s_root) {
1761 iput(root_inode);
1762 goto error;
1763 }
1764 // define and initialize hash function
1765 sbi->s_hash_function = hash_function(s);
1766 if (sbi->s_hash_function == NULL) {
1767 dput(s->s_root);
1768 s->s_root = NULL;
1769 goto error;
1770 }
1771
1772 if (is_reiserfs_3_5(rs)
1773 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1774 set_bit(REISERFS_3_5, &(sbi->s_properties));
1775 else if (old_format)
1776 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1777 else
1778 set_bit(REISERFS_3_6, &(sbi->s_properties));
1779
1780 if (!(s->s_flags & MS_RDONLY)) {
1781
1782 errval = journal_begin(&th, s, 1);
1783 if (errval) {
1784 dput(s->s_root);
1785 s->s_root = NULL;
1786 goto error;
1787 }
1788 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1789
1790 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1791 set_sb_fs_state(rs, 0);
1792
1793 /* Clear out s_bmap_nr if it would wrap. We can handle this
1794 * case, but older revisions can't. This will cause the
1795 * file system to fail mount on those older implementations,
1796 * avoiding corruption. -jeffm */
1797 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1798 sb_bmap_nr(rs) != 0) {
1799 reiserfs_warning(s, "super-2030", "This file system "
1800 "claims to use %u bitmap blocks in "
1801 "its super block, but requires %u. "
1802 "Clearing to zero.", sb_bmap_nr(rs),
1803 reiserfs_bmap_count(s));
1804
1805 set_sb_bmap_nr(rs, 0);
1806 }
1807
1808 if (old_format_only(s)) {
1809 /* filesystem of format 3.5 either with standard or non-standard
1810 journal */
1811 if (convert_reiserfs(s)) {
1812 /* and -o conv is given */
1813 if (!silent)
1814 reiserfs_info(s,
1815 "converting 3.5 filesystem to the 3.6 format");
1816
1817 if (is_reiserfs_3_5(rs))
1818 /* put magic string of 3.6 format. 2.2 will not be able to
1819 mount this filesystem anymore */
1820 memcpy(rs->s_v1.s_magic,
1821 reiserfs_3_6_magic_string,
1822 sizeof
1823 (reiserfs_3_6_magic_string));
1824
1825 set_sb_version(rs, REISERFS_VERSION_2);
1826 reiserfs_convert_objectid_map_v1(s);
1827 set_bit(REISERFS_3_6, &(sbi->s_properties));
1828 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1829 } else if (!silent) {
1830 reiserfs_info(s, "using 3.5.x disk format\n");
1831 }
1832 } else
1833 set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1834
1835
1836 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1837 errval = journal_end(&th, s, 1);
1838 if (errval) {
1839 dput(s->s_root);
1840 s->s_root = NULL;
1841 goto error;
1842 }
1843
1844 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1845 dput(s->s_root);
1846 s->s_root = NULL;
1847 goto error;
1848 }
1849
1850 /* look for files which were to be removed in previous session */
1851 finish_unfinished(s);
1852 } else {
1853 if (old_format_only(s) && !silent) {
1854 reiserfs_info(s, "using 3.5.x disk format\n");
1855 }
1856
1857 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1858 dput(s->s_root);
1859 s->s_root = NULL;
1860 goto error;
1861 }
1862 }
1863 // mark hash in super block: it could be unset. overwrite should be ok
1864 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1865
1866 handle_attrs(s);
1867
1868 reiserfs_proc_info_init(s);
1869
1870 init_waitqueue_head(&(sbi->s_wait));
1871 spin_lock_init(&sbi->bitmap_lock);
1872
1873 return (0);
1874
1875 error:
1876 if (jinit_done) { /* kill the commit thread, free journal ram */
1877 journal_release_error(NULL, s);
1878 }
1879
1880 reiserfs_free_bitmap_cache(s);
1881 if (SB_BUFFER_WITH_SB(s))
1882 brelse(SB_BUFFER_WITH_SB(s));
1883 #ifdef CONFIG_QUOTA
1884 {
1885 int j;
1886 for (j = 0; j < MAXQUOTAS; j++)
1887 kfree(qf_names[j]);
1888 }
1889 #endif
1890 kfree(sbi);
1891
1892 s->s_fs_info = NULL;
1893 return errval;
1894 }
1895
1896 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1897 {
1898 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1899
1900 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1901 buf->f_bfree = sb_free_blocks(rs);
1902 buf->f_bavail = buf->f_bfree;
1903 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1904 buf->f_bsize = dentry->d_sb->s_blocksize;
1905 /* changed to accommodate gcc folks. */
1906 buf->f_type = REISERFS_SUPER_MAGIC;
1907 return 0;
1908 }
1909
1910 #ifdef CONFIG_QUOTA
1911 static int reiserfs_write_dquot(struct dquot *dquot)
1912 {
1913 struct reiserfs_transaction_handle th;
1914 int ret, err;
1915
1916 reiserfs_write_lock(dquot->dq_sb);
1917 ret =
1918 journal_begin(&th, dquot->dq_sb,
1919 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1920 if (ret)
1921 goto out;
1922 ret = dquot_commit(dquot);
1923 err =
1924 journal_end(&th, dquot->dq_sb,
1925 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1926 if (!ret && err)
1927 ret = err;
1928 out:
1929 reiserfs_write_unlock(dquot->dq_sb);
1930 return ret;
1931 }
1932
1933 static int reiserfs_acquire_dquot(struct dquot *dquot)
1934 {
1935 struct reiserfs_transaction_handle th;
1936 int ret, err;
1937
1938 reiserfs_write_lock(dquot->dq_sb);
1939 ret =
1940 journal_begin(&th, dquot->dq_sb,
1941 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1942 if (ret)
1943 goto out;
1944 ret = dquot_acquire(dquot);
1945 err =
1946 journal_end(&th, dquot->dq_sb,
1947 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1948 if (!ret && err)
1949 ret = err;
1950 out:
1951 reiserfs_write_unlock(dquot->dq_sb);
1952 return ret;
1953 }
1954
1955 static int reiserfs_release_dquot(struct dquot *dquot)
1956 {
1957 struct reiserfs_transaction_handle th;
1958 int ret, err;
1959
1960 reiserfs_write_lock(dquot->dq_sb);
1961 ret =
1962 journal_begin(&th, dquot->dq_sb,
1963 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1964 if (ret) {
1965 /* Release dquot anyway to avoid endless cycle in dqput() */
1966 dquot_release(dquot);
1967 goto out;
1968 }
1969 ret = dquot_release(dquot);
1970 err =
1971 journal_end(&th, dquot->dq_sb,
1972 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1973 if (!ret && err)
1974 ret = err;
1975 out:
1976 reiserfs_write_unlock(dquot->dq_sb);
1977 return ret;
1978 }
1979
1980 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1981 {
1982 /* Are we journaling quotas? */
1983 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1984 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1985 dquot_mark_dquot_dirty(dquot);
1986 return reiserfs_write_dquot(dquot);
1987 } else
1988 return dquot_mark_dquot_dirty(dquot);
1989 }
1990
1991 static int reiserfs_write_info(struct super_block *sb, int type)
1992 {
1993 struct reiserfs_transaction_handle th;
1994 int ret, err;
1995
1996 /* Data block + inode block */
1997 reiserfs_write_lock(sb);
1998 ret = journal_begin(&th, sb, 2);
1999 if (ret)
2000 goto out;
2001 ret = dquot_commit_info(sb, type);
2002 err = journal_end(&th, sb, 2);
2003 if (!ret && err)
2004 ret = err;
2005 out:
2006 reiserfs_write_unlock(sb);
2007 return ret;
2008 }
2009
2010 /*
2011 * Turn on quotas during mount time - we need to find the quota file and such...
2012 */
2013 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2014 {
2015 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2016 REISERFS_SB(sb)->s_jquota_fmt, type);
2017 }
2018
2019 /*
2020 * Standard function to be called on quota_on
2021 */
2022 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2023 char *name, int remount)
2024 {
2025 int err;
2026 struct path path;
2027 struct inode *inode;
2028 struct reiserfs_transaction_handle th;
2029
2030 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2031 return -EINVAL;
2032 /* No more checks needed? Path and format_id are bogus anyway... */
2033 if (remount)
2034 return vfs_quota_on(sb, type, format_id, name, 1);
2035 err = kern_path(name, LOOKUP_FOLLOW, &path);
2036 if (err)
2037 return err;
2038 /* Quotafile not on the same filesystem? */
2039 if (path.mnt->mnt_sb != sb) {
2040 err = -EXDEV;
2041 goto out;
2042 }
2043 inode = path.dentry->d_inode;
2044 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2045 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2046 err = reiserfs_unpack(inode, NULL);
2047 if (err) {
2048 reiserfs_warning(sb, "super-6520",
2049 "Unpacking tail of quota file failed"
2050 " (%d). Cannot turn on quotas.", err);
2051 err = -EINVAL;
2052 goto out;
2053 }
2054 mark_inode_dirty(inode);
2055 }
2056 /* Journaling quota? */
2057 if (REISERFS_SB(sb)->s_qf_names[type]) {
2058 /* Quotafile not of fs root? */
2059 if (path.dentry->d_parent != sb->s_root)
2060 reiserfs_warning(sb, "super-6521",
2061 "Quota file not on filesystem root. "
2062 "Journalled quota will not work.");
2063 }
2064
2065 /*
2066 * When we journal data on quota file, we have to flush journal to see
2067 * all updates to the file when we bypass pagecache...
2068 */
2069 if (reiserfs_file_data_log(inode)) {
2070 /* Just start temporary transaction and finish it */
2071 err = journal_begin(&th, sb, 1);
2072 if (err)
2073 goto out;
2074 err = journal_end_sync(&th, sb, 1);
2075 if (err)
2076 goto out;
2077 }
2078 err = vfs_quota_on_path(sb, type, format_id, &path);
2079 out:
2080 path_put(&path);
2081 return err;
2082 }
2083
2084 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2085 * acquiring the locks... As quota files are never truncated and quota code
2086 * itself serializes the operations (and noone else should touch the files)
2087 * we don't have to be afraid of races */
2088 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2089 size_t len, loff_t off)
2090 {
2091 struct inode *inode = sb_dqopt(sb)->files[type];
2092 unsigned long blk = off >> sb->s_blocksize_bits;
2093 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2094 size_t toread;
2095 struct buffer_head tmp_bh, *bh;
2096 loff_t i_size = i_size_read(inode);
2097
2098 if (off > i_size)
2099 return 0;
2100 if (off + len > i_size)
2101 len = i_size - off;
2102 toread = len;
2103 while (toread > 0) {
2104 tocopy =
2105 sb->s_blocksize - offset <
2106 toread ? sb->s_blocksize - offset : toread;
2107 tmp_bh.b_state = 0;
2108 /* Quota files are without tails so we can safely use this function */
2109 reiserfs_write_lock(sb);
2110 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2111 reiserfs_write_unlock(sb);
2112 if (err)
2113 return err;
2114 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2115 memset(data, 0, tocopy);
2116 else {
2117 bh = sb_bread(sb, tmp_bh.b_blocknr);
2118 if (!bh)
2119 return -EIO;
2120 memcpy(data, bh->b_data + offset, tocopy);
2121 brelse(bh);
2122 }
2123 offset = 0;
2124 toread -= tocopy;
2125 data += tocopy;
2126 blk++;
2127 }
2128 return len;
2129 }
2130
2131 /* Write to quotafile (we know the transaction is already started and has
2132 * enough credits) */
2133 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2134 const char *data, size_t len, loff_t off)
2135 {
2136 struct inode *inode = sb_dqopt(sb)->files[type];
2137 unsigned long blk = off >> sb->s_blocksize_bits;
2138 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2139 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2140 size_t towrite = len;
2141 struct buffer_head tmp_bh, *bh;
2142
2143 if (!current->journal_info) {
2144 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2145 " cancelled because transaction is not started.\n",
2146 (unsigned long long)off, (unsigned long long)len);
2147 return -EIO;
2148 }
2149 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2150 while (towrite > 0) {
2151 tocopy = sb->s_blocksize - offset < towrite ?
2152 sb->s_blocksize - offset : towrite;
2153 tmp_bh.b_state = 0;
2154 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2155 if (err)
2156 goto out;
2157 if (offset || tocopy != sb->s_blocksize)
2158 bh = sb_bread(sb, tmp_bh.b_blocknr);
2159 else
2160 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2161 if (!bh) {
2162 err = -EIO;
2163 goto out;
2164 }
2165 lock_buffer(bh);
2166 memcpy(bh->b_data + offset, data, tocopy);
2167 flush_dcache_page(bh->b_page);
2168 set_buffer_uptodate(bh);
2169 unlock_buffer(bh);
2170 reiserfs_prepare_for_journal(sb, bh, 1);
2171 journal_mark_dirty(current->journal_info, sb, bh);
2172 if (!journal_quota)
2173 reiserfs_add_ordered_list(inode, bh);
2174 brelse(bh);
2175 offset = 0;
2176 towrite -= tocopy;
2177 data += tocopy;
2178 blk++;
2179 }
2180 out:
2181 if (len == towrite) {
2182 mutex_unlock(&inode->i_mutex);
2183 return err;
2184 }
2185 if (inode->i_size < off + len - towrite)
2186 i_size_write(inode, off + len - towrite);
2187 inode->i_version++;
2188 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2189 mark_inode_dirty(inode);
2190 mutex_unlock(&inode->i_mutex);
2191 return len - towrite;
2192 }
2193
2194 #endif
2195
2196 static int get_super_block(struct file_system_type *fs_type,
2197 int flags, const char *dev_name,
2198 void *data, struct vfsmount *mnt)
2199 {
2200 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2201 mnt);
2202 }
2203
2204 static int __init init_reiserfs_fs(void)
2205 {
2206 int ret;
2207
2208 if ((ret = init_inodecache())) {
2209 return ret;
2210 }
2211
2212 reiserfs_proc_info_global_init();
2213 reiserfs_proc_register_global("version",
2214 reiserfs_global_version_in_proc);
2215
2216 ret = register_filesystem(&reiserfs_fs_type);
2217
2218 if (ret == 0) {
2219 return 0;
2220 }
2221
2222 reiserfs_proc_unregister_global("version");
2223 reiserfs_proc_info_global_done();
2224 destroy_inodecache();
2225
2226 return ret;
2227 }
2228
2229 static void __exit exit_reiserfs_fs(void)
2230 {
2231 reiserfs_proc_unregister_global("version");
2232 reiserfs_proc_info_global_done();
2233 unregister_filesystem(&reiserfs_fs_type);
2234 destroy_inodecache();
2235 }
2236
2237 struct file_system_type reiserfs_fs_type = {
2238 .owner = THIS_MODULE,
2239 .name = "reiserfs",
2240 .get_sb = get_super_block,
2241 .kill_sb = reiserfs_kill_sb,
2242 .fs_flags = FS_REQUIRES_DEV,
2243 };
2244
2245 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2246 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2247 MODULE_LICENSE("GPL");
2248
2249 module_init(init_reiserfs_fs);
2250 module_exit(exit_reiserfs_fs);
Linux kernel - Deliverables
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