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[PATCH] Switch Kprobes inline functions to __kprobes for x86_64
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blobcae2abbc0c713933a4283f9e66f215ebd3ec57db
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/config.h>
15 #include <linux/module.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
19 #include <linux/reiserfs_fs.h>
20 #include <linux/reiserfs_acl.h>
21 #include <linux/reiserfs_xattr.h>
22 #include <linux/smp_lock.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/buffer_head.h>
26 #include <linux/vfs.h>
27 #include <linux/namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/quotaops.h>
31
32 struct file_system_type reiserfs_fs_type;
33
34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
37
38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
39 {
40 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
41 strlen(reiserfs_3_5_magic_string));
42 }
43
44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
45 {
46 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
47 strlen(reiserfs_3_6_magic_string));
48 }
49
50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
51 {
52 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
53 strlen(reiserfs_jr_magic_string));
54 }
55
56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
57 {
58 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
59 is_reiserfs_jr(rs));
60 }
61
62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
63 static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf);
64
65 static int reiserfs_sync_fs(struct super_block *s, int wait)
66 {
67 if (!(s->s_flags & MS_RDONLY)) {
68 struct reiserfs_transaction_handle th;
69 reiserfs_write_lock(s);
70 if (!journal_begin(&th, s, 1))
71 if (!journal_end_sync(&th, s, 1))
72 reiserfs_flush_old_commits(s);
73 s->s_dirt = 0; /* Even if it's not true.
74 * We'll loop forever in sync_supers otherwise */
75 reiserfs_write_unlock(s);
76 } else {
77 s->s_dirt = 0;
78 }
79 return 0;
80 }
81
82 static void reiserfs_write_super(struct super_block *s)
83 {
84 reiserfs_sync_fs(s, 1);
85 }
86
87 static void reiserfs_write_super_lockfs(struct super_block *s)
88 {
89 struct reiserfs_transaction_handle th;
90 reiserfs_write_lock(s);
91 if (!(s->s_flags & MS_RDONLY)) {
92 int err = journal_begin(&th, s, 1);
93 if (err) {
94 reiserfs_block_writes(&th);
95 } else {
96 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
97 1);
98 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
99 reiserfs_block_writes(&th);
100 journal_end_sync(&th, s, 1);
101 }
102 }
103 s->s_dirt = 0;
104 reiserfs_write_unlock(s);
105 }
106
107 static void reiserfs_unlockfs(struct super_block *s)
108 {
109 reiserfs_allow_writes(s);
110 }
111
112 extern const struct in_core_key MAX_IN_CORE_KEY;
113
114 /* this is used to delete "save link" when there are no items of a
115 file it points to. It can either happen if unlink is completed but
116 "save unlink" removal, or if file has both unlink and truncate
117 pending and as unlink completes first (because key of "save link"
118 protecting unlink is bigger that a key lf "save link" which
119 protects truncate), so there left no items to make truncate
120 completion on */
121 static int remove_save_link_only(struct super_block *s,
122 struct reiserfs_key *key, int oid_free)
123 {
124 struct reiserfs_transaction_handle th;
125 int err;
126
127 /* we are going to do one balancing */
128 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
129 if (err)
130 return err;
131
132 reiserfs_delete_solid_item(&th, NULL, key);
133 if (oid_free)
134 /* removals are protected by direct items */
135 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
136
137 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
138 }
139
140 #ifdef CONFIG_QUOTA
141 static int reiserfs_quota_on_mount(struct super_block *, int);
142 #endif
143
144 /* look for uncompleted unlinks and truncates and complete them */
145 static int finish_unfinished(struct super_block *s)
146 {
147 INITIALIZE_PATH(path);
148 struct cpu_key max_cpu_key, obj_key;
149 struct reiserfs_key save_link_key;
150 int retval = 0;
151 struct item_head *ih;
152 struct buffer_head *bh;
153 int item_pos;
154 char *item;
155 int done;
156 struct inode *inode;
157 int truncate;
158 #ifdef CONFIG_QUOTA
159 int i;
160 int ms_active_set;
161 #endif
162
163 /* compose key to look for "save" links */
164 max_cpu_key.version = KEY_FORMAT_3_5;
165 max_cpu_key.on_disk_key.k_dir_id = ~0U;
166 max_cpu_key.on_disk_key.k_objectid = ~0U;
167 set_cpu_key_k_offset(&max_cpu_key, ~0U);
168 max_cpu_key.key_length = 3;
169
170 #ifdef CONFIG_QUOTA
171 /* Needed for iput() to work correctly and not trash data */
172 if (s->s_flags & MS_ACTIVE) {
173 ms_active_set = 0;
174 } else {
175 ms_active_set = 1;
176 s->s_flags |= MS_ACTIVE;
177 }
178 /* Turn on quotas so that they are updated correctly */
179 for (i = 0; i < MAXQUOTAS; i++) {
180 if (REISERFS_SB(s)->s_qf_names[i]) {
181 int ret = reiserfs_quota_on_mount(s, i);
182 if (ret < 0)
183 reiserfs_warning(s,
184 "reiserfs: cannot turn on journalled quota: error %d",
185 ret);
186 }
187 }
188 #endif
189
190 done = 0;
191 REISERFS_SB(s)->s_is_unlinked_ok = 1;
192 while (!retval) {
193 retval = search_item(s, &max_cpu_key, &path);
194 if (retval != ITEM_NOT_FOUND) {
195 reiserfs_warning(s,
196 "vs-2140: finish_unfinished: search_by_key returned %d",
197 retval);
198 break;
199 }
200
201 bh = get_last_bh(&path);
202 item_pos = get_item_pos(&path);
203 if (item_pos != B_NR_ITEMS(bh)) {
204 reiserfs_warning(s,
205 "vs-2060: finish_unfinished: wrong position found");
206 break;
207 }
208 item_pos--;
209 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212 /* there are no "save" links anymore */
213 break;
214
215 save_link_key = ih->ih_key;
216 if (is_indirect_le_ih(ih))
217 truncate = 1;
218 else
219 truncate = 0;
220
221 /* reiserfs_iget needs k_dirid and k_objectid only */
222 item = B_I_PITEM(bh, ih);
223 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224 obj_key.on_disk_key.k_objectid =
225 le32_to_cpu(ih->ih_key.k_objectid);
226 obj_key.on_disk_key.k_offset = 0;
227 obj_key.on_disk_key.k_type = 0;
228
229 pathrelse(&path);
230
231 inode = reiserfs_iget(s, &obj_key);
232 if (!inode) {
233 /* the unlink almost completed, it just did not manage to remove
234 "save" link and release objectid */
235 reiserfs_warning(s,
236 "vs-2180: finish_unfinished: iget failed for %K",
237 &obj_key);
238 retval = remove_save_link_only(s, &save_link_key, 1);
239 continue;
240 }
241
242 if (!truncate && inode->i_nlink) {
243 /* file is not unlinked */
244 reiserfs_warning(s,
245 "vs-2185: finish_unfinished: file %K is not unlinked",
246 &obj_key);
247 retval = remove_save_link_only(s, &save_link_key, 0);
248 continue;
249 }
250 DQUOT_INIT(inode);
251
252 if (truncate && S_ISDIR(inode->i_mode)) {
253 /* We got a truncate request for a dir which is impossible.
254 The only imaginable way is to execute unfinished truncate request
255 then boot into old kernel, remove the file and create dir with
256 the same key. */
257 reiserfs_warning(s,
258 "green-2101: impossible truncate on a directory %k. Please report",
259 INODE_PKEY(inode));
260 retval = remove_save_link_only(s, &save_link_key, 0);
261 truncate = 0;
262 iput(inode);
263 continue;
264 }
265
266 if (truncate) {
267 REISERFS_I(inode)->i_flags |=
268 i_link_saved_truncate_mask;
269 /* not completed truncate found. New size was committed together
270 with "save" link */
271 reiserfs_info(s, "Truncating %k to %Ld ..",
272 INODE_PKEY(inode), inode->i_size);
273 reiserfs_truncate_file(inode,
274 0
275 /*don't update modification time */
276 );
277 retval = remove_save_link(inode, truncate);
278 } else {
279 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280 /* not completed unlink (rmdir) found */
281 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282 /* removal gets completed in iput */
283 retval = 0;
284 }
285
286 iput(inode);
287 printk("done\n");
288 done++;
289 }
290 REISERFS_SB(s)->s_is_unlinked_ok = 0;
291
292 #ifdef CONFIG_QUOTA
293 /* Turn quotas off */
294 for (i = 0; i < MAXQUOTAS; i++) {
295 if (sb_dqopt(s)->files[i])
296 vfs_quota_off_mount(s, i);
297 }
298 if (ms_active_set)
299 /* Restore the flag back */
300 s->s_flags &= ~MS_ACTIVE;
301 #endif
302 pathrelse(&path);
303 if (done)
304 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
305 "Completed\n", done);
306 return retval;
307 }
308
309 /* to protect file being unlinked from getting lost we "safe" link files
310 being unlinked. This link will be deleted in the same transaction with last
311 item of file. mounting the filesytem we scan all these links and remove
312 files which almost got lost */
313 void add_save_link(struct reiserfs_transaction_handle *th,
314 struct inode *inode, int truncate)
315 {
316 INITIALIZE_PATH(path);
317 int retval;
318 struct cpu_key key;
319 struct item_head ih;
320 __le32 link;
321
322 BUG_ON(!th->t_trans_id);
323
324 /* file can only get one "save link" of each kind */
325 RFALSE(truncate &&
326 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
327 "saved link already exists for truncated inode %lx",
328 (long)inode->i_ino);
329 RFALSE(!truncate &&
330 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
331 "saved link already exists for unlinked inode %lx",
332 (long)inode->i_ino);
333
334 /* setup key of "save" link */
335 key.version = KEY_FORMAT_3_5;
336 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
337 key.on_disk_key.k_objectid = inode->i_ino;
338 if (!truncate) {
339 /* unlink, rmdir, rename */
340 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
341 set_cpu_key_k_type(&key, TYPE_DIRECT);
342
343 /* item head of "safe" link */
344 make_le_item_head(&ih, &key, key.version,
345 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
346 4 /*length */ , 0xffff /*free space */ );
347 } else {
348 /* truncate */
349 if (S_ISDIR(inode->i_mode))
350 reiserfs_warning(inode->i_sb,
351 "green-2102: Adding a truncate savelink for a directory %k! Please report",
352 INODE_PKEY(inode));
353 set_cpu_key_k_offset(&key, 1);
354 set_cpu_key_k_type(&key, TYPE_INDIRECT);
355
356 /* item head of "safe" link */
357 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
358 4 /*length */ , 0 /*free space */ );
359 }
360 key.key_length = 3;
361
362 /* look for its place in the tree */
363 retval = search_item(inode->i_sb, &key, &path);
364 if (retval != ITEM_NOT_FOUND) {
365 if (retval != -ENOSPC)
366 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
367 "search_by_key (%K) returned %d", &key,
368 retval);
369 pathrelse(&path);
370 return;
371 }
372
373 /* body of "save" link */
374 link = INODE_PKEY(inode)->k_dir_id;
375
376 /* put "save" link inot tree, don't charge quota to anyone */
377 retval =
378 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
379 if (retval) {
380 if (retval != -ENOSPC)
381 reiserfs_warning(inode->i_sb,
382 "vs-2120: add_save_link: insert_item returned %d",
383 retval);
384 } else {
385 if (truncate)
386 REISERFS_I(inode)->i_flags |=
387 i_link_saved_truncate_mask;
388 else
389 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
390 }
391 }
392
393 /* this opens transaction unlike add_save_link */
394 int remove_save_link(struct inode *inode, int truncate)
395 {
396 struct reiserfs_transaction_handle th;
397 struct reiserfs_key key;
398 int err;
399
400 /* we are going to do one balancing only */
401 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
402 if (err)
403 return err;
404
405 /* setup key of "save" link */
406 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
407 key.k_objectid = INODE_PKEY(inode)->k_objectid;
408 if (!truncate) {
409 /* unlink, rmdir, rename */
410 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
411 1 + inode->i_sb->s_blocksize);
412 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
413 } else {
414 /* truncate */
415 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
416 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
417 }
418
419 if ((truncate &&
420 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
421 (!truncate &&
422 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
423 /* don't take quota bytes from anywhere */
424 reiserfs_delete_solid_item(&th, NULL, &key);
425 if (!truncate) {
426 reiserfs_release_objectid(&th, inode->i_ino);
427 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
428 } else
429 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
430
431 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
432 }
433
434 static void reiserfs_put_super(struct super_block *s)
435 {
436 int i;
437 struct reiserfs_transaction_handle th;
438 th.t_trans_id = 0;
439
440 if (REISERFS_SB(s)->xattr_root) {
441 d_invalidate(REISERFS_SB(s)->xattr_root);
442 dput(REISERFS_SB(s)->xattr_root);
443 }
444
445 if (REISERFS_SB(s)->priv_root) {
446 d_invalidate(REISERFS_SB(s)->priv_root);
447 dput(REISERFS_SB(s)->priv_root);
448 }
449
450 /* change file system state to current state if it was mounted with read-write permissions */
451 if (!(s->s_flags & MS_RDONLY)) {
452 if (!journal_begin(&th, s, 10)) {
453 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
454 1);
455 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
456 REISERFS_SB(s)->s_mount_state);
457 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
458 }
459 }
460
461 /* note, journal_release checks for readonly mount, and can decide not
462 ** to do a journal_end
463 */
464 journal_release(&th, s);
465
466 for (i = 0; i < SB_BMAP_NR(s); i++)
467 brelse(SB_AP_BITMAP(s)[i].bh);
468
469 vfree(SB_AP_BITMAP(s));
470
471 brelse(SB_BUFFER_WITH_SB(s));
472
473 print_statistics(s);
474
475 if (REISERFS_SB(s)->reserved_blocks != 0) {
476 reiserfs_warning(s,
477 "green-2005: reiserfs_put_super: reserved blocks left %d",
478 REISERFS_SB(s)->reserved_blocks);
479 }
480
481 reiserfs_proc_info_done(s);
482
483 kfree(s->s_fs_info);
484 s->s_fs_info = NULL;
485
486 return;
487 }
488
489 static kmem_cache_t *reiserfs_inode_cachep;
490
491 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
492 {
493 struct reiserfs_inode_info *ei;
494 ei = (struct reiserfs_inode_info *)
495 kmem_cache_alloc(reiserfs_inode_cachep, SLAB_KERNEL);
496 if (!ei)
497 return NULL;
498 return &ei->vfs_inode;
499 }
500
501 static void reiserfs_destroy_inode(struct inode *inode)
502 {
503 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
504 }
505
506 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
507 {
508 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
509
510 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
511 SLAB_CTOR_CONSTRUCTOR) {
512 INIT_LIST_HEAD(&ei->i_prealloc_list);
513 inode_init_once(&ei->vfs_inode);
514 ei->i_acl_access = NULL;
515 ei->i_acl_default = NULL;
516 }
517 }
518
519 static int init_inodecache(void)
520 {
521 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
522 sizeof(struct
523 reiserfs_inode_info),
524 0, (SLAB_RECLAIM_ACCOUNT|
525 SLAB_MEM_SPREAD),
526 init_once, NULL);
527 if (reiserfs_inode_cachep == NULL)
528 return -ENOMEM;
529 return 0;
530 }
531
532 static void destroy_inodecache(void)
533 {
534 if (kmem_cache_destroy(reiserfs_inode_cachep))
535 reiserfs_warning(NULL,
536 "reiserfs_inode_cache: not all structures were freed");
537 }
538
539 /* we don't mark inodes dirty, we just log them */
540 static void reiserfs_dirty_inode(struct inode *inode)
541 {
542 struct reiserfs_transaction_handle th;
543
544 int err = 0;
545 if (inode->i_sb->s_flags & MS_RDONLY) {
546 reiserfs_warning(inode->i_sb,
547 "clm-6006: writing inode %lu on readonly FS",
548 inode->i_ino);
549 return;
550 }
551 reiserfs_write_lock(inode->i_sb);
552
553 /* this is really only used for atime updates, so they don't have
554 ** to be included in O_SYNC or fsync
555 */
556 err = journal_begin(&th, inode->i_sb, 1);
557 if (err) {
558 reiserfs_write_unlock(inode->i_sb);
559 return;
560 }
561 reiserfs_update_sd(&th, inode);
562 journal_end(&th, inode->i_sb, 1);
563 reiserfs_write_unlock(inode->i_sb);
564 }
565
566 static void reiserfs_clear_inode(struct inode *inode)
567 {
568 struct posix_acl *acl;
569
570 acl = REISERFS_I(inode)->i_acl_access;
571 if (acl && !IS_ERR(acl))
572 posix_acl_release(acl);
573 REISERFS_I(inode)->i_acl_access = NULL;
574
575 acl = REISERFS_I(inode)->i_acl_default;
576 if (acl && !IS_ERR(acl))
577 posix_acl_release(acl);
578 REISERFS_I(inode)->i_acl_default = NULL;
579 }
580
581 #ifdef CONFIG_QUOTA
582 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
583 size_t, loff_t);
584 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
585 loff_t);
586 #endif
587
588 static struct super_operations reiserfs_sops = {
589 .alloc_inode = reiserfs_alloc_inode,
590 .destroy_inode = reiserfs_destroy_inode,
591 .write_inode = reiserfs_write_inode,
592 .dirty_inode = reiserfs_dirty_inode,
593 .delete_inode = reiserfs_delete_inode,
594 .clear_inode = reiserfs_clear_inode,
595 .put_super = reiserfs_put_super,
596 .write_super = reiserfs_write_super,
597 .sync_fs = reiserfs_sync_fs,
598 .write_super_lockfs = reiserfs_write_super_lockfs,
599 .unlockfs = reiserfs_unlockfs,
600 .statfs = reiserfs_statfs,
601 .remount_fs = reiserfs_remount,
602 #ifdef CONFIG_QUOTA
603 .quota_read = reiserfs_quota_read,
604 .quota_write = reiserfs_quota_write,
605 #endif
606 };
607
608 #ifdef CONFIG_QUOTA
609 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
610
611 static int reiserfs_dquot_initialize(struct inode *, int);
612 static int reiserfs_dquot_drop(struct inode *);
613 static int reiserfs_write_dquot(struct dquot *);
614 static int reiserfs_acquire_dquot(struct dquot *);
615 static int reiserfs_release_dquot(struct dquot *);
616 static int reiserfs_mark_dquot_dirty(struct dquot *);
617 static int reiserfs_write_info(struct super_block *, int);
618 static int reiserfs_quota_on(struct super_block *, int, int, char *);
619
620 static struct dquot_operations reiserfs_quota_operations = {
621 .initialize = reiserfs_dquot_initialize,
622 .drop = reiserfs_dquot_drop,
623 .alloc_space = dquot_alloc_space,
624 .alloc_inode = dquot_alloc_inode,
625 .free_space = dquot_free_space,
626 .free_inode = dquot_free_inode,
627 .transfer = dquot_transfer,
628 .write_dquot = reiserfs_write_dquot,
629 .acquire_dquot = reiserfs_acquire_dquot,
630 .release_dquot = reiserfs_release_dquot,
631 .mark_dirty = reiserfs_mark_dquot_dirty,
632 .write_info = reiserfs_write_info,
633 };
634
635 static struct quotactl_ops reiserfs_qctl_operations = {
636 .quota_on = reiserfs_quota_on,
637 .quota_off = vfs_quota_off,
638 .quota_sync = vfs_quota_sync,
639 .get_info = vfs_get_dqinfo,
640 .set_info = vfs_set_dqinfo,
641 .get_dqblk = vfs_get_dqblk,
642 .set_dqblk = vfs_set_dqblk,
643 };
644 #endif
645
646 static struct export_operations reiserfs_export_ops = {
647 .encode_fh = reiserfs_encode_fh,
648 .decode_fh = reiserfs_decode_fh,
649 .get_parent = reiserfs_get_parent,
650 .get_dentry = reiserfs_get_dentry,
651 };
652
653 /* this struct is used in reiserfs_getopt () for containing the value for those
654 mount options that have values rather than being toggles. */
655 typedef struct {
656 char *value;
657 int setmask; /* bitmask which is to set on mount_options bitmask when this
658 value is found, 0 is no bits are to be changed. */
659 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
660 value is found, 0 is no bits are to be changed. This is
661 applied BEFORE setmask */
662 } arg_desc_t;
663
664 /* Set this bit in arg_required to allow empty arguments */
665 #define REISERFS_OPT_ALLOWEMPTY 31
666
667 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
668 mount options */
669 typedef struct {
670 char *option_name;
671 int arg_required; /* 0 if argument is not required, not 0 otherwise */
672 const arg_desc_t *values; /* list of values accepted by an option */
673 int setmask; /* bitmask which is to set on mount_options bitmask when this
674 value is found, 0 is no bits are to be changed. */
675 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
676 value is found, 0 is no bits are to be changed. This is
677 applied BEFORE setmask */
678 } opt_desc_t;
679
680 /* possible values for -o data= */
681 static const arg_desc_t logging_mode[] = {
682 {"ordered", 1 << REISERFS_DATA_ORDERED,
683 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
684 {"journal", 1 << REISERFS_DATA_LOG,
685 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
686 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
687 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
688 {.value = NULL}
689 };
690
691 /* possible values for -o barrier= */
692 static const arg_desc_t barrier_mode[] = {
693 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
694 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
695 {.value = NULL}
696 };
697
698 /* possible values for "-o block-allocator=" and bits which are to be set in
699 s_mount_opt of reiserfs specific part of in-core super block */
700 static const arg_desc_t balloc[] = {
701 {"noborder", 1 << REISERFS_NO_BORDER, 0},
702 {"border", 0, 1 << REISERFS_NO_BORDER},
703 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
704 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
705 {"test4", 1 << REISERFS_TEST4, 0},
706 {"notest4", 0, 1 << REISERFS_TEST4},
707 {NULL, 0, 0}
708 };
709
710 static const arg_desc_t tails[] = {
711 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
712 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
713 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
714 {NULL, 0, 0}
715 };
716
717 static const arg_desc_t error_actions[] = {
718 {"panic", 1 << REISERFS_ERROR_PANIC,
719 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
720 {"ro-remount", 1 << REISERFS_ERROR_RO,
721 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
722 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
723 {"continue", 1 << REISERFS_ERROR_CONTINUE,
724 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
725 #endif
726 {NULL, 0, 0},
727 };
728
729 int reiserfs_default_io_size = 128 * 1024; /* Default recommended I/O size is 128k.
730 There might be broken applications that are
731 confused by this. Use nolargeio mount option
732 to get usual i/o size = PAGE_SIZE.
733 */
734
735 /* proceed only one option from a list *cur - string containing of mount options
736 opts - array of options which are accepted
737 opt_arg - if option is found and requires an argument and if it is specifed
738 in the input - pointer to the argument is stored here
739 bit_flags - if option requires to set a certain bit - it is set here
740 return -1 if unknown option is found, opt->arg_required otherwise */
741 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
742 char **opt_arg, unsigned long *bit_flags)
743 {
744 char *p;
745 /* foo=bar,
746 ^ ^ ^
747 | | +-- option_end
748 | +-- arg_start
749 +-- option_start
750 */
751 const opt_desc_t *opt;
752 const arg_desc_t *arg;
753
754 p = *cur;
755
756 /* assume argument cannot contain commas */
757 *cur = strchr(p, ',');
758 if (*cur) {
759 *(*cur) = '\0';
760 (*cur)++;
761 }
762
763 if (!strncmp(p, "alloc=", 6)) {
764 /* Ugly special case, probably we should redo options parser so that
765 it can understand several arguments for some options, also so that
766 it can fill several bitfields with option values. */
767 if (reiserfs_parse_alloc_options(s, p + 6)) {
768 return -1;
769 } else {
770 return 0;
771 }
772 }
773
774 /* for every option in the list */
775 for (opt = opts; opt->option_name; opt++) {
776 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
777 if (bit_flags) {
778 if (opt->clrmask ==
779 (1 << REISERFS_UNSUPPORTED_OPT))
780 reiserfs_warning(s, "%s not supported.",
781 p);
782 else
783 *bit_flags &= ~opt->clrmask;
784 if (opt->setmask ==
785 (1 << REISERFS_UNSUPPORTED_OPT))
786 reiserfs_warning(s, "%s not supported.",
787 p);
788 else
789 *bit_flags |= opt->setmask;
790 }
791 break;
792 }
793 }
794 if (!opt->option_name) {
795 reiserfs_warning(s, "unknown mount option \"%s\"", p);
796 return -1;
797 }
798
799 p += strlen(opt->option_name);
800 switch (*p) {
801 case '=':
802 if (!opt->arg_required) {
803 reiserfs_warning(s,
804 "the option \"%s\" does not require an argument",
805 opt->option_name);
806 return -1;
807 }
808 break;
809
810 case 0:
811 if (opt->arg_required) {
812 reiserfs_warning(s,
813 "the option \"%s\" requires an argument",
814 opt->option_name);
815 return -1;
816 }
817 break;
818 default:
819 reiserfs_warning(s, "head of option \"%s\" is only correct",
820 opt->option_name);
821 return -1;
822 }
823
824 /* move to the argument, or to next option if argument is not required */
825 p++;
826
827 if (opt->arg_required
828 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
829 && !strlen(p)) {
830 /* this catches "option=," if not allowed */
831 reiserfs_warning(s, "empty argument for \"%s\"",
832 opt->option_name);
833 return -1;
834 }
835
836 if (!opt->values) {
837 /* *=NULLopt_arg contains pointer to argument */
838 *opt_arg = p;
839 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840 }
841
842 /* values possible for this option are listed in opt->values */
843 for (arg = opt->values; arg->value; arg++) {
844 if (!strcmp(p, arg->value)) {
845 if (bit_flags) {
846 *bit_flags &= ~arg->clrmask;
847 *bit_flags |= arg->setmask;
848 }
849 return opt->arg_required;
850 }
851 }
852
853 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
854 opt->option_name);
855 return -1;
856 }
857
858 /* returns 0 if something is wrong in option string, 1 - otherwise */
859 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
860 unsigned long *mount_options,
861 /* after the parsing phase, contains the
862 collection of bitflags defining what
863 mount options were selected. */
864 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
865 char **jdev_name,
866 unsigned int *commit_max_age)
867 {
868 int c;
869 char *arg = NULL;
870 char *pos;
871 opt_desc_t opts[] = {
872 /* Compatibility stuff, so that -o notail for old setups still work */
873 {"tails",.arg_required = 't',.values = tails},
874 {"notail",.clrmask =
875 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
876 {"conv",.setmask = 1 << REISERFS_CONVERT},
877 {"attrs",.setmask = 1 << REISERFS_ATTRS},
878 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
879 #ifdef CONFIG_REISERFS_FS_XATTR
880 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
881 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
882 #else
883 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
884 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
885 #endif
886 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
887 {"acl",.setmask = 1 << REISERFS_POSIXACL},
888 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
889 #else
890 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
892 #endif
893 {.option_name = "nolog"},
894 {"replayonly",.setmask = 1 << REPLAYONLY},
895 {"block-allocator",.arg_required = 'a',.values = balloc},
896 {"data",.arg_required = 'd',.values = logging_mode},
897 {"barrier",.arg_required = 'b',.values = barrier_mode},
898 {"resize",.arg_required = 'r',.values = NULL},
899 {"jdev",.arg_required = 'j',.values = NULL},
900 {"nolargeio",.arg_required = 'w',.values = NULL},
901 {"commit",.arg_required = 'c',.values = NULL},
902 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
903 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
904 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
905 {"errors",.arg_required = 'e',.values = error_actions},
906 {"usrjquota",.arg_required =
907 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
908 {"grpjquota",.arg_required =
909 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
910 {"jqfmt",.arg_required = 'f',.values = NULL},
911 {.option_name = NULL}
912 };
913
914 *blocks = 0;
915 if (!options || !*options)
916 /* use default configuration: create tails, journaling on, no
917 conversion to newest format */
918 return 1;
919
920 for (pos = options; pos;) {
921 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
922 if (c == -1)
923 /* wrong option is given */
924 return 0;
925
926 if (c == 'r') {
927 char *p;
928
929 p = NULL;
930 /* "resize=NNN" or "resize=auto" */
931
932 if (!strcmp(arg, "auto")) {
933 /* From JFS code, to auto-get the size. */
934 *blocks =
935 s->s_bdev->bd_inode->i_size >> s->
936 s_blocksize_bits;
937 } else {
938 *blocks = simple_strtoul(arg, &p, 0);
939 if (*p != '\0') {
940 /* NNN does not look like a number */
941 reiserfs_warning(s,
942 "reiserfs_parse_options: bad value %s",
943 arg);
944 return 0;
945 }
946 }
947 }
948
949 if (c == 'c') {
950 char *p = NULL;
951 unsigned long val = simple_strtoul(arg, &p, 0);
952 /* commit=NNN (time in seconds) */
953 if (*p != '\0' || val >= (unsigned int)-1) {
954 reiserfs_warning(s,
955 "reiserfs_parse_options: bad value %s",
956 arg);
957 return 0;
958 }
959 *commit_max_age = (unsigned int)val;
960 }
961
962 if (c == 'w') {
963 char *p = NULL;
964 int val = simple_strtoul(arg, &p, 0);
965
966 if (*p != '\0') {
967 reiserfs_warning(s,
968 "reiserfs_parse_options: non-numeric value %s for nolargeio option",
969 arg);
970 return 0;
971 }
972 if (val)
973 reiserfs_default_io_size = PAGE_SIZE;
974 else
975 reiserfs_default_io_size = 128 * 1024;
976 }
977
978 if (c == 'j') {
979 if (arg && *arg && jdev_name) {
980 if (*jdev_name) { //Hm, already assigned?
981 reiserfs_warning(s,
982 "reiserfs_parse_options: journal device was already specified to be %s",
983 *jdev_name);
984 return 0;
985 }
986 *jdev_name = arg;
987 }
988 }
989 #ifdef CONFIG_QUOTA
990 if (c == 'u' || c == 'g') {
991 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
992
993 if (sb_any_quota_enabled(s)) {
994 reiserfs_warning(s,
995 "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
996 return 0;
997 }
998 if (*arg) { /* Some filename specified? */
999 if (REISERFS_SB(s)->s_qf_names[qtype]
1000 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1001 arg)) {
1002 reiserfs_warning(s,
1003 "reiserfs_parse_options: %s quota file already specified.",
1004 QTYPE2NAME(qtype));
1005 return 0;
1006 }
1007 if (strchr(arg, '/')) {
1008 reiserfs_warning(s,
1009 "reiserfs_parse_options: quotafile must be on filesystem root.");
1010 return 0;
1011 }
1012 REISERFS_SB(s)->s_qf_names[qtype] =
1013 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1014 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1015 reiserfs_warning(s,
1016 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1017 return 0;
1018 }
1019 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1020 *mount_options |= 1 << REISERFS_QUOTA;
1021 } else {
1022 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1023 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1024 }
1025 }
1026 if (c == 'f') {
1027 if (!strcmp(arg, "vfsold"))
1028 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1029 else if (!strcmp(arg, "vfsv0"))
1030 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1031 else {
1032 reiserfs_warning(s,
1033 "reiserfs_parse_options: unknown quota format specified.");
1034 return 0;
1035 }
1036 }
1037 #else
1038 if (c == 'u' || c == 'g' || c == 'f') {
1039 reiserfs_warning(s,
1040 "reiserfs_parse_options: journalled quota options not supported.");
1041 return 0;
1042 }
1043 #endif
1044 }
1045
1046 #ifdef CONFIG_QUOTA
1047 if (!REISERFS_SB(s)->s_jquota_fmt
1048 && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1049 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1050 reiserfs_warning(s,
1051 "reiserfs_parse_options: journalled quota format not specified.");
1052 return 0;
1053 }
1054 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1055 if (!(*mount_options & (1 << REISERFS_QUOTA))
1056 && sb_any_quota_enabled(s)) {
1057 reiserfs_warning(s,
1058 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1059 return 0;
1060 }
1061 #endif
1062
1063 return 1;
1064 }
1065
1066 static void switch_data_mode(struct super_block *s, unsigned long mode)
1067 {
1068 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1069 (1 << REISERFS_DATA_ORDERED) |
1070 (1 << REISERFS_DATA_WRITEBACK));
1071 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1072 }
1073
1074 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1075 {
1076 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1077 if (!reiserfs_data_log(s)) {
1078 switch_data_mode(s, REISERFS_DATA_LOG);
1079 reiserfs_info(s, "switching to journaled data mode\n");
1080 }
1081 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1082 if (!reiserfs_data_ordered(s)) {
1083 switch_data_mode(s, REISERFS_DATA_ORDERED);
1084 reiserfs_info(s, "switching to ordered data mode\n");
1085 }
1086 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1087 if (!reiserfs_data_writeback(s)) {
1088 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1089 reiserfs_info(s, "switching to writeback data mode\n");
1090 }
1091 }
1092 }
1093
1094 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1095 {
1096 int flush = (1 << REISERFS_BARRIER_FLUSH);
1097 int none = (1 << REISERFS_BARRIER_NONE);
1098 int all_barrier = flush | none;
1099
1100 if (bits & all_barrier) {
1101 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1102 if (bits & flush) {
1103 REISERFS_SB(s)->s_mount_opt |= flush;
1104 printk("reiserfs: enabling write barrier flush mode\n");
1105 } else if (bits & none) {
1106 REISERFS_SB(s)->s_mount_opt |= none;
1107 printk("reiserfs: write barriers turned off\n");
1108 }
1109 }
1110 }
1111
1112 static void handle_attrs(struct super_block *s)
1113 {
1114 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1115
1116 if (reiserfs_attrs(s)) {
1117 if (old_format_only(s)) {
1118 reiserfs_warning(s,
1119 "reiserfs: cannot support attributes on 3.5.x disk format");
1120 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1121 return;
1122 }
1123 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1124 reiserfs_warning(s,
1125 "reiserfs: cannot support attributes until flag is set in super-block");
1126 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1127 }
1128 }
1129 }
1130
1131 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1132 {
1133 struct reiserfs_super_block *rs;
1134 struct reiserfs_transaction_handle th;
1135 unsigned long blocks;
1136 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1137 unsigned long safe_mask = 0;
1138 unsigned int commit_max_age = (unsigned int)-1;
1139 struct reiserfs_journal *journal = SB_JOURNAL(s);
1140 int err;
1141 #ifdef CONFIG_QUOTA
1142 int i;
1143 #endif
1144
1145 rs = SB_DISK_SUPER_BLOCK(s);
1146
1147 if (!reiserfs_parse_options
1148 (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1149 #ifdef CONFIG_QUOTA
1150 for (i = 0; i < MAXQUOTAS; i++) {
1151 kfree(REISERFS_SB(s)->s_qf_names[i]);
1152 REISERFS_SB(s)->s_qf_names[i] = NULL;
1153 }
1154 #endif
1155 return -EINVAL;
1156 }
1157
1158 handle_attrs(s);
1159
1160 /* Add options that are safe here */
1161 safe_mask |= 1 << REISERFS_SMALLTAIL;
1162 safe_mask |= 1 << REISERFS_LARGETAIL;
1163 safe_mask |= 1 << REISERFS_NO_BORDER;
1164 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1165 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1166 safe_mask |= 1 << REISERFS_TEST4;
1167 safe_mask |= 1 << REISERFS_ATTRS;
1168 safe_mask |= 1 << REISERFS_XATTRS_USER;
1169 safe_mask |= 1 << REISERFS_POSIXACL;
1170 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1171 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1172 safe_mask |= 1 << REISERFS_ERROR_RO;
1173 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1174 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1175 safe_mask |= 1 << REISERFS_QUOTA;
1176
1177 /* Update the bitmask, taking care to keep
1178 * the bits we're not allowed to change here */
1179 REISERFS_SB(s)->s_mount_opt =
1180 (REISERFS_SB(s)->
1181 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1182
1183 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1184 journal->j_max_commit_age = commit_max_age;
1185 journal->j_max_trans_age = commit_max_age;
1186 } else if (commit_max_age == 0) {
1187 /* 0 means restore defaults. */
1188 journal->j_max_commit_age = journal->j_default_max_commit_age;
1189 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1190 }
1191
1192 if (blocks) {
1193 int rc = reiserfs_resize(s, blocks);
1194 if (rc != 0)
1195 return rc;
1196 }
1197
1198 if (*mount_flags & MS_RDONLY) {
1199 reiserfs_xattr_init(s, *mount_flags);
1200 /* remount read-only */
1201 if (s->s_flags & MS_RDONLY)
1202 /* it is read-only already */
1203 return 0;
1204 /* try to remount file system with read-only permissions */
1205 if (sb_umount_state(rs) == REISERFS_VALID_FS
1206 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1207 return 0;
1208 }
1209
1210 err = journal_begin(&th, s, 10);
1211 if (err)
1212 return err;
1213
1214 /* Mounting a rw partition read-only. */
1215 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1216 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1217 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1218 } else {
1219 /* remount read-write */
1220 if (!(s->s_flags & MS_RDONLY)) {
1221 reiserfs_xattr_init(s, *mount_flags);
1222 return 0; /* We are read-write already */
1223 }
1224
1225 if (reiserfs_is_journal_aborted(journal))
1226 return journal->j_errno;
1227
1228 handle_data_mode(s, mount_options);
1229 handle_barrier_mode(s, mount_options);
1230 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1231 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1232 err = journal_begin(&th, s, 10);
1233 if (err)
1234 return err;
1235
1236 /* Mount a partition which is read-only, read-write */
1237 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1238 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1239 s->s_flags &= ~MS_RDONLY;
1240 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1241 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1242 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1243 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1244 }
1245 /* this will force a full flush of all journal lists */
1246 SB_JOURNAL(s)->j_must_wait = 1;
1247 err = journal_end(&th, s, 10);
1248 if (err)
1249 return err;
1250 s->s_dirt = 0;
1251
1252 if (!(*mount_flags & MS_RDONLY)) {
1253 finish_unfinished(s);
1254 reiserfs_xattr_init(s, *mount_flags);
1255 }
1256
1257 return 0;
1258 }
1259
1260 /* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk.
1261 * @sb - superblock for this filesystem
1262 * @bi - the bitmap info to be loaded. Requires that bi->bh is valid.
1263 *
1264 * This routine counts how many free bits there are, finding the first zero
1265 * as a side effect. Could also be implemented as a loop of test_bit() calls, or
1266 * a loop of find_first_zero_bit() calls. This implementation is similar to
1267 * find_first_zero_bit(), but doesn't return after it finds the first bit.
1268 * Should only be called on fs mount, but should be fairly efficient anyways.
1269 *
1270 * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself
1271 * will * invariably occupt block 0 represented in the bitmap. The only
1272 * exception to this is when free_count also == 0, since there will be no
1273 * free blocks at all.
1274 */
1275
1276 static void load_bitmap_info_data(struct super_block *sb,
1277 struct reiserfs_bitmap_info *bi)
1278 {
1279 unsigned long *cur = (unsigned long *)bi->bh->b_data;
1280
1281 while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) {
1282
1283 /* No need to scan if all 0's or all 1's.
1284 * Since we're only counting 0's, we can simply ignore all 1's */
1285 if (*cur == 0) {
1286 if (bi->first_zero_hint == 0) {
1287 bi->first_zero_hint =
1288 ((char *)cur - bi->bh->b_data) << 3;
1289 }
1290 bi->free_count += sizeof(unsigned long) * 8;
1291 } else if (*cur != ~0L) {
1292 int b;
1293 for (b = 0; b < sizeof(unsigned long) * 8; b++) {
1294 if (!reiserfs_test_le_bit(b, cur)) {
1295 bi->free_count++;
1296 if (bi->first_zero_hint == 0)
1297 bi->first_zero_hint =
1298 (((char *)cur -
1299 bi->bh->b_data) << 3) + b;
1300 }
1301 }
1302 }
1303 cur++;
1304 }
1305
1306 #ifdef CONFIG_REISERFS_CHECK
1307 // This outputs a lot of unneded info on big FSes
1308 // reiserfs_warning ("bitmap loaded from block %d: %d free blocks",
1309 // bi->bh->b_blocknr, bi->free_count);
1310 #endif
1311 }
1312
1313 static int read_bitmaps(struct super_block *s)
1314 {
1315 int i, bmap_nr;
1316
1317 SB_AP_BITMAP(s) =
1318 vmalloc(sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1319 if (SB_AP_BITMAP(s) == 0)
1320 return 1;
1321 memset(SB_AP_BITMAP(s), 0,
1322 sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1323 for (i = 0, bmap_nr =
1324 REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
1325 i < SB_BMAP_NR(s); i++, bmap_nr = s->s_blocksize * 8 * i) {
1326 SB_AP_BITMAP(s)[i].bh = sb_getblk(s, bmap_nr);
1327 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
1328 ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
1329 }
1330 for (i = 0; i < SB_BMAP_NR(s); i++) {
1331 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1332 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1333 reiserfs_warning(s, "sh-2029: reiserfs read_bitmaps: "
1334 "bitmap block (#%lu) reading failed",
1335 SB_AP_BITMAP(s)[i].bh->b_blocknr);
1336 for (i = 0; i < SB_BMAP_NR(s); i++)
1337 brelse(SB_AP_BITMAP(s)[i].bh);
1338 vfree(SB_AP_BITMAP(s));
1339 SB_AP_BITMAP(s) = NULL;
1340 return 1;
1341 }
1342 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1343 }
1344 return 0;
1345 }
1346
1347 static int read_old_bitmaps(struct super_block *s)
1348 {
1349 int i;
1350 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1351 int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1; /* first of bitmap blocks */
1352
1353 /* read true bitmap */
1354 SB_AP_BITMAP(s) =
1355 vmalloc(sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1356 if (SB_AP_BITMAP(s) == 0)
1357 return 1;
1358
1359 memset(SB_AP_BITMAP(s), 0,
1360 sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1361
1362 for (i = 0; i < sb_bmap_nr(rs); i++) {
1363 SB_AP_BITMAP(s)[i].bh = sb_bread(s, bmp1 + i);
1364 if (!SB_AP_BITMAP(s)[i].bh)
1365 return 1;
1366 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1367 }
1368
1369 return 0;
1370 }
1371
1372 static int read_super_block(struct super_block *s, int offset)
1373 {
1374 struct buffer_head *bh;
1375 struct reiserfs_super_block *rs;
1376 int fs_blocksize;
1377
1378 bh = sb_bread(s, offset / s->s_blocksize);
1379 if (!bh) {
1380 reiserfs_warning(s, "sh-2006: read_super_block: "
1381 "bread failed (dev %s, block %lu, size %lu)",
1382 reiserfs_bdevname(s), offset / s->s_blocksize,
1383 s->s_blocksize);
1384 return 1;
1385 }
1386
1387 rs = (struct reiserfs_super_block *)bh->b_data;
1388 if (!is_any_reiserfs_magic_string(rs)) {
1389 brelse(bh);
1390 return 1;
1391 }
1392 //
1393 // ok, reiserfs signature (old or new) found in at the given offset
1394 //
1395 fs_blocksize = sb_blocksize(rs);
1396 brelse(bh);
1397 sb_set_blocksize(s, fs_blocksize);
1398
1399 bh = sb_bread(s, offset / s->s_blocksize);
1400 if (!bh) {
1401 reiserfs_warning(s, "sh-2007: read_super_block: "
1402 "bread failed (dev %s, block %lu, size %lu)\n",
1403 reiserfs_bdevname(s), offset / s->s_blocksize,
1404 s->s_blocksize);
1405 return 1;
1406 }
1407
1408 rs = (struct reiserfs_super_block *)bh->b_data;
1409 if (sb_blocksize(rs) != s->s_blocksize) {
1410 reiserfs_warning(s, "sh-2011: read_super_block: "
1411 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1412 reiserfs_bdevname(s),
1413 (unsigned long long)bh->b_blocknr,
1414 s->s_blocksize);
1415 brelse(bh);
1416 return 1;
1417 }
1418
1419 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1420 brelse(bh);
1421 reiserfs_warning(s,
1422 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1423 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1424 "get newer reiserfsprogs package");
1425 return 1;
1426 }
1427
1428 SB_BUFFER_WITH_SB(s) = bh;
1429 SB_DISK_SUPER_BLOCK(s) = rs;
1430
1431 if (is_reiserfs_jr(rs)) {
1432 /* magic is of non-standard journal filesystem, look at s_version to
1433 find which format is in use */
1434 if (sb_version(rs) == REISERFS_VERSION_2)
1435 reiserfs_warning(s,
1436 "read_super_block: found reiserfs format \"3.6\""
1437 " with non-standard journal");
1438 else if (sb_version(rs) == REISERFS_VERSION_1)
1439 reiserfs_warning(s,
1440 "read_super_block: found reiserfs format \"3.5\""
1441 " with non-standard journal");
1442 else {
1443 reiserfs_warning(s,
1444 "sh-2012: read_super_block: found unknown "
1445 "format \"%u\" of reiserfs with non-standard magic",
1446 sb_version(rs));
1447 return 1;
1448 }
1449 } else
1450 /* s_version of standard format may contain incorrect information,
1451 so we just look at the magic string */
1452 reiserfs_info(s,
1453 "found reiserfs format \"%s\" with standard journal\n",
1454 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1455
1456 s->s_op = &reiserfs_sops;
1457 s->s_export_op = &reiserfs_export_ops;
1458 #ifdef CONFIG_QUOTA
1459 s->s_qcop = &reiserfs_qctl_operations;
1460 s->dq_op = &reiserfs_quota_operations;
1461 #endif
1462
1463 /* new format is limited by the 32 bit wide i_blocks field, want to
1464 ** be one full block below that.
1465 */
1466 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1467 return 0;
1468 }
1469
1470 /* after journal replay, reread all bitmap and super blocks */
1471 static int reread_meta_blocks(struct super_block *s)
1472 {
1473 int i;
1474 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1475 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1476 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1477 reiserfs_warning(s,
1478 "reread_meta_blocks, error reading the super");
1479 return 1;
1480 }
1481
1482 for (i = 0; i < SB_BMAP_NR(s); i++) {
1483 ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh));
1484 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1485 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1486 reiserfs_warning(s,
1487 "reread_meta_blocks, error reading bitmap block number %d at %llu",
1488 i,
1489 (unsigned long long)SB_AP_BITMAP(s)[i].
1490 bh->b_blocknr);
1491 return 1;
1492 }
1493 }
1494 return 0;
1495
1496 }
1497
1498 /////////////////////////////////////////////////////
1499 // hash detection stuff
1500
1501 // if root directory is empty - we set default - Yura's - hash and
1502 // warn about it
1503 // FIXME: we look for only one name in a directory. If tea and yura
1504 // bith have the same value - we ask user to send report to the
1505 // mailing list
1506 static __u32 find_hash_out(struct super_block *s)
1507 {
1508 int retval;
1509 struct inode *inode;
1510 struct cpu_key key;
1511 INITIALIZE_PATH(path);
1512 struct reiserfs_dir_entry de;
1513 __u32 hash = DEFAULT_HASH;
1514
1515 inode = s->s_root->d_inode;
1516
1517 do { // Some serious "goto"-hater was there ;)
1518 u32 teahash, r5hash, yurahash;
1519
1520 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1521 retval = search_by_entry_key(s, &key, &path, &de);
1522 if (retval == IO_ERROR) {
1523 pathrelse(&path);
1524 return UNSET_HASH;
1525 }
1526 if (retval == NAME_NOT_FOUND)
1527 de.de_entry_num--;
1528 set_de_name_and_namelen(&de);
1529 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1530 /* allow override in this case */
1531 if (reiserfs_rupasov_hash(s)) {
1532 hash = YURA_HASH;
1533 }
1534 reiserfs_warning(s, "FS seems to be empty, autodetect "
1535 "is using the default hash");
1536 break;
1537 }
1538 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1539 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1540 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1541 if (((teahash == r5hash)
1542 &&
1543 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1544 == r5hash)) || ((teahash == yurahash)
1545 && (yurahash ==
1546 GET_HASH_VALUE(deh_offset
1547 (&
1548 (de.
1549 de_deh[de.
1550 de_entry_num])))))
1551 || ((r5hash == yurahash)
1552 && (yurahash ==
1553 GET_HASH_VALUE(deh_offset
1554 (&(de.de_deh[de.de_entry_num])))))) {
1555 reiserfs_warning(s,
1556 "Unable to automatically detect hash function. "
1557 "Please mount with -o hash={tea,rupasov,r5}",
1558 reiserfs_bdevname(s));
1559 hash = UNSET_HASH;
1560 break;
1561 }
1562 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1563 yurahash)
1564 hash = YURA_HASH;
1565 else if (GET_HASH_VALUE
1566 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1567 hash = TEA_HASH;
1568 else if (GET_HASH_VALUE
1569 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1570 hash = R5_HASH;
1571 else {
1572 reiserfs_warning(s, "Unrecognised hash function");
1573 hash = UNSET_HASH;
1574 }
1575 } while (0);
1576
1577 pathrelse(&path);
1578 return hash;
1579 }
1580
1581 // finds out which hash names are sorted with
1582 static int what_hash(struct super_block *s)
1583 {
1584 __u32 code;
1585
1586 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1587
1588 /* reiserfs_hash_detect() == true if any of the hash mount options
1589 ** were used. We must check them to make sure the user isn't
1590 ** using a bad hash value
1591 */
1592 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1593 code = find_hash_out(s);
1594
1595 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1596 /* detection has found the hash, and we must check against the
1597 ** mount options
1598 */
1599 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1600 reiserfs_warning(s, "Error, %s hash detected, "
1601 "unable to force rupasov hash",
1602 reiserfs_hashname(code));
1603 code = UNSET_HASH;
1604 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1605 reiserfs_warning(s, "Error, %s hash detected, "
1606 "unable to force tea hash",
1607 reiserfs_hashname(code));
1608 code = UNSET_HASH;
1609 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1610 reiserfs_warning(s, "Error, %s hash detected, "
1611 "unable to force r5 hash",
1612 reiserfs_hashname(code));
1613 code = UNSET_HASH;
1614 }
1615 } else {
1616 /* find_hash_out was not called or could not determine the hash */
1617 if (reiserfs_rupasov_hash(s)) {
1618 code = YURA_HASH;
1619 } else if (reiserfs_tea_hash(s)) {
1620 code = TEA_HASH;
1621 } else if (reiserfs_r5_hash(s)) {
1622 code = R5_HASH;
1623 }
1624 }
1625
1626 /* if we are mounted RW, and we have a new valid hash code, update
1627 ** the super
1628 */
1629 if (code != UNSET_HASH &&
1630 !(s->s_flags & MS_RDONLY) &&
1631 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1632 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1633 }
1634 return code;
1635 }
1636
1637 // return pointer to appropriate function
1638 static hashf_t hash_function(struct super_block *s)
1639 {
1640 switch (what_hash(s)) {
1641 case TEA_HASH:
1642 reiserfs_info(s, "Using tea hash to sort names\n");
1643 return keyed_hash;
1644 case YURA_HASH:
1645 reiserfs_info(s, "Using rupasov hash to sort names\n");
1646 return yura_hash;
1647 case R5_HASH:
1648 reiserfs_info(s, "Using r5 hash to sort names\n");
1649 return r5_hash;
1650 }
1651 return NULL;
1652 }
1653
1654 // this is used to set up correct value for old partitions
1655 static int function2code(hashf_t func)
1656 {
1657 if (func == keyed_hash)
1658 return TEA_HASH;
1659 if (func == yura_hash)
1660 return YURA_HASH;
1661 if (func == r5_hash)
1662 return R5_HASH;
1663
1664 BUG(); // should never happen
1665
1666 return 0;
1667 }
1668
1669 #define SWARN(silent, s, ...) \
1670 if (!(silent)) \
1671 reiserfs_warning (s, __VA_ARGS__)
1672
1673 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1674 {
1675 struct inode *root_inode;
1676 int j;
1677 struct reiserfs_transaction_handle th;
1678 int old_format = 0;
1679 unsigned long blocks;
1680 unsigned int commit_max_age = 0;
1681 int jinit_done = 0;
1682 struct reiserfs_iget_args args;
1683 struct reiserfs_super_block *rs;
1684 char *jdev_name;
1685 struct reiserfs_sb_info *sbi;
1686 int errval = -EINVAL;
1687
1688 sbi = kmalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1689 if (!sbi) {
1690 errval = -ENOMEM;
1691 goto error;
1692 }
1693 s->s_fs_info = sbi;
1694 memset(sbi, 0, sizeof(struct reiserfs_sb_info));
1695 /* Set default values for options: non-aggressive tails, RO on errors */
1696 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1697 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1698 /* no preallocation minimum, be smart in
1699 reiserfs_file_write instead */
1700 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1701 /* Preallocate by 16 blocks (17-1) at once */
1702 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1703 /* Initialize the rwsem for xattr dir */
1704 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1705
1706 /* setup default block allocator options */
1707 reiserfs_init_alloc_options(s);
1708
1709 jdev_name = NULL;
1710 if (reiserfs_parse_options
1711 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1712 &commit_max_age) == 0) {
1713 goto error;
1714 }
1715
1716 if (blocks) {
1717 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1718 "for remount only");
1719 goto error;
1720 }
1721
1722 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1723 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1724 old_format = 1;
1725 /* try new format (64-th 1k block), which can contain reiserfs super block */
1726 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1727 SWARN(silent, s,
1728 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1729 reiserfs_bdevname(s));
1730 goto error;
1731 }
1732
1733 rs = SB_DISK_SUPER_BLOCK(s);
1734 /* Let's do basic sanity check to verify that underlying device is not
1735 smaller than the filesystem. If the check fails then abort and scream,
1736 because bad stuff will happen otherwise. */
1737 if (s->s_bdev && s->s_bdev->bd_inode
1738 && i_size_read(s->s_bdev->bd_inode) <
1739 sb_block_count(rs) * sb_blocksize(rs)) {
1740 SWARN(silent, s,
1741 "Filesystem on %s cannot be mounted because it is bigger than the device",
1742 reiserfs_bdevname(s));
1743 SWARN(silent, s,
1744 "You may need to run fsck or increase size of your LVM partition");
1745 SWARN(silent, s,
1746 "Or may be you forgot to reboot after fdisk when it told you to");
1747 goto error;
1748 }
1749
1750 sbi->s_mount_state = SB_REISERFS_STATE(s);
1751 sbi->s_mount_state = REISERFS_VALID_FS;
1752
1753 if (old_format ? read_old_bitmaps(s) : read_bitmaps(s)) {
1754 SWARN(silent, s,
1755 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1756 goto error;
1757 }
1758 #ifdef CONFIG_REISERFS_CHECK
1759 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1760 SWARN(silent, s, "- it is slow mode for debugging.");
1761 #endif
1762
1763 /* make data=ordered the default */
1764 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1765 !reiserfs_data_writeback(s)) {
1766 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1767 }
1768
1769 if (reiserfs_data_log(s)) {
1770 reiserfs_info(s, "using journaled data mode\n");
1771 } else if (reiserfs_data_ordered(s)) {
1772 reiserfs_info(s, "using ordered data mode\n");
1773 } else {
1774 reiserfs_info(s, "using writeback data mode\n");
1775 }
1776 if (reiserfs_barrier_flush(s)) {
1777 printk("reiserfs: using flush barriers\n");
1778 }
1779 // set_device_ro(s->s_dev, 1) ;
1780 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1781 SWARN(silent, s,
1782 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1783 goto error;
1784 } else {
1785 jinit_done = 1; /* once this is set, journal_release must be called
1786 ** if we error out of the mount
1787 */
1788 }
1789 if (reread_meta_blocks(s)) {
1790 SWARN(silent, s,
1791 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1792 goto error;
1793 }
1794
1795 if (replay_only(s))
1796 goto error;
1797
1798 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1799 SWARN(silent, s,
1800 "clm-7000: Detected readonly device, marking FS readonly");
1801 s->s_flags |= MS_RDONLY;
1802 }
1803 args.objectid = REISERFS_ROOT_OBJECTID;
1804 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1805 root_inode =
1806 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1807 reiserfs_init_locked_inode, (void *)(&args));
1808 if (!root_inode) {
1809 SWARN(silent, s,
1810 "jmacd-10: reiserfs_fill_super: get root inode failed");
1811 goto error;
1812 }
1813
1814 if (root_inode->i_state & I_NEW) {
1815 reiserfs_read_locked_inode(root_inode, &args);
1816 unlock_new_inode(root_inode);
1817 }
1818
1819 s->s_root = d_alloc_root(root_inode);
1820 if (!s->s_root) {
1821 iput(root_inode);
1822 goto error;
1823 }
1824 // define and initialize hash function
1825 sbi->s_hash_function = hash_function(s);
1826 if (sbi->s_hash_function == NULL) {
1827 dput(s->s_root);
1828 s->s_root = NULL;
1829 goto error;
1830 }
1831
1832 if (is_reiserfs_3_5(rs)
1833 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1834 set_bit(REISERFS_3_5, &(sbi->s_properties));
1835 else
1836 set_bit(REISERFS_3_6, &(sbi->s_properties));
1837
1838 if (!(s->s_flags & MS_RDONLY)) {
1839
1840 errval = journal_begin(&th, s, 1);
1841 if (errval) {
1842 dput(s->s_root);
1843 s->s_root = NULL;
1844 goto error;
1845 }
1846 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1847
1848 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1849 set_sb_fs_state(rs, 0);
1850
1851 if (old_format_only(s)) {
1852 /* filesystem of format 3.5 either with standard or non-standard
1853 journal */
1854 if (convert_reiserfs(s)) {
1855 /* and -o conv is given */
1856 if (!silent)
1857 reiserfs_info(s,
1858 "converting 3.5 filesystem to the 3.6 format");
1859
1860 if (is_reiserfs_3_5(rs))
1861 /* put magic string of 3.6 format. 2.2 will not be able to
1862 mount this filesystem anymore */
1863 memcpy(rs->s_v1.s_magic,
1864 reiserfs_3_6_magic_string,
1865 sizeof
1866 (reiserfs_3_6_magic_string));
1867
1868 set_sb_version(rs, REISERFS_VERSION_2);
1869 reiserfs_convert_objectid_map_v1(s);
1870 set_bit(REISERFS_3_6, &(sbi->s_properties));
1871 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1872 } else if (!silent) {
1873 reiserfs_info(s, "using 3.5.x disk format\n");
1874 }
1875 }
1876
1877 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1878 errval = journal_end(&th, s, 1);
1879 if (errval) {
1880 dput(s->s_root);
1881 s->s_root = NULL;
1882 goto error;
1883 }
1884
1885 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1886 dput(s->s_root);
1887 s->s_root = NULL;
1888 goto error;
1889 }
1890
1891 /* look for files which were to be removed in previous session */
1892 finish_unfinished(s);
1893 } else {
1894 if (old_format_only(s) && !silent) {
1895 reiserfs_info(s, "using 3.5.x disk format\n");
1896 }
1897
1898 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1899 dput(s->s_root);
1900 s->s_root = NULL;
1901 goto error;
1902 }
1903 }
1904 // mark hash in super block: it could be unset. overwrite should be ok
1905 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1906
1907 handle_attrs(s);
1908
1909 reiserfs_proc_info_init(s);
1910
1911 init_waitqueue_head(&(sbi->s_wait));
1912 spin_lock_init(&sbi->bitmap_lock);
1913
1914 return (0);
1915
1916 error:
1917 if (jinit_done) { /* kill the commit thread, free journal ram */
1918 journal_release_error(NULL, s);
1919 }
1920 if (SB_DISK_SUPER_BLOCK(s)) {
1921 for (j = 0; j < SB_BMAP_NR(s); j++) {
1922 if (SB_AP_BITMAP(s))
1923 brelse(SB_AP_BITMAP(s)[j].bh);
1924 }
1925 vfree(SB_AP_BITMAP(s));
1926 }
1927 if (SB_BUFFER_WITH_SB(s))
1928 brelse(SB_BUFFER_WITH_SB(s));
1929 #ifdef CONFIG_QUOTA
1930 for (j = 0; j < MAXQUOTAS; j++) {
1931 kfree(sbi->s_qf_names[j]);
1932 sbi->s_qf_names[j] = NULL;
1933 }
1934 #endif
1935 kfree(sbi);
1936
1937 s->s_fs_info = NULL;
1938 return errval;
1939 }
1940
1941 static int reiserfs_statfs(struct super_block *s, struct kstatfs *buf)
1942 {
1943 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1944
1945 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1946 buf->f_bfree = sb_free_blocks(rs);
1947 buf->f_bavail = buf->f_bfree;
1948 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1949 buf->f_bsize = s->s_blocksize;
1950 /* changed to accommodate gcc folks. */
1951 buf->f_type = REISERFS_SUPER_MAGIC;
1952 return 0;
1953 }
1954
1955 #ifdef CONFIG_QUOTA
1956 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1957 {
1958 struct reiserfs_transaction_handle th;
1959 int ret, err;
1960
1961 /* We may create quota structure so we need to reserve enough blocks */
1962 reiserfs_write_lock(inode->i_sb);
1963 ret =
1964 journal_begin(&th, inode->i_sb,
1965 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1966 if (ret)
1967 goto out;
1968 ret = dquot_initialize(inode, type);
1969 err =
1970 journal_end(&th, inode->i_sb,
1971 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1972 if (!ret && err)
1973 ret = err;
1974 out:
1975 reiserfs_write_unlock(inode->i_sb);
1976 return ret;
1977 }
1978
1979 static int reiserfs_dquot_drop(struct inode *inode)
1980 {
1981 struct reiserfs_transaction_handle th;
1982 int ret, err;
1983
1984 /* We may delete quota structure so we need to reserve enough blocks */
1985 reiserfs_write_lock(inode->i_sb);
1986 ret =
1987 journal_begin(&th, inode->i_sb,
1988 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1989 if (ret)
1990 goto out;
1991 ret = dquot_drop(inode);
1992 err =
1993 journal_end(&th, inode->i_sb,
1994 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1995 if (!ret && err)
1996 ret = err;
1997 out:
1998 reiserfs_write_unlock(inode->i_sb);
1999 return ret;
2000 }
2001
2002 static int reiserfs_write_dquot(struct dquot *dquot)
2003 {
2004 struct reiserfs_transaction_handle th;
2005 int ret, err;
2006
2007 reiserfs_write_lock(dquot->dq_sb);
2008 ret =
2009 journal_begin(&th, dquot->dq_sb,
2010 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2011 if (ret)
2012 goto out;
2013 ret = dquot_commit(dquot);
2014 err =
2015 journal_end(&th, dquot->dq_sb,
2016 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2017 if (!ret && err)
2018 ret = err;
2019 out:
2020 reiserfs_write_unlock(dquot->dq_sb);
2021 return ret;
2022 }
2023
2024 static int reiserfs_acquire_dquot(struct dquot *dquot)
2025 {
2026 struct reiserfs_transaction_handle th;
2027 int ret, err;
2028
2029 reiserfs_write_lock(dquot->dq_sb);
2030 ret =
2031 journal_begin(&th, dquot->dq_sb,
2032 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2033 if (ret)
2034 goto out;
2035 ret = dquot_acquire(dquot);
2036 err =
2037 journal_end(&th, dquot->dq_sb,
2038 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2039 if (!ret && err)
2040 ret = err;
2041 out:
2042 reiserfs_write_unlock(dquot->dq_sb);
2043 return ret;
2044 }
2045
2046 static int reiserfs_release_dquot(struct dquot *dquot)
2047 {
2048 struct reiserfs_transaction_handle th;
2049 int ret, err;
2050
2051 reiserfs_write_lock(dquot->dq_sb);
2052 ret =
2053 journal_begin(&th, dquot->dq_sb,
2054 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2055 if (ret)
2056 goto out;
2057 ret = dquot_release(dquot);
2058 err =
2059 journal_end(&th, dquot->dq_sb,
2060 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2061 if (!ret && err)
2062 ret = err;
2063 out:
2064 reiserfs_write_unlock(dquot->dq_sb);
2065 return ret;
2066 }
2067
2068 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2069 {
2070 /* Are we journalling quotas? */
2071 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2072 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2073 dquot_mark_dquot_dirty(dquot);
2074 return reiserfs_write_dquot(dquot);
2075 } else
2076 return dquot_mark_dquot_dirty(dquot);
2077 }
2078
2079 static int reiserfs_write_info(struct super_block *sb, int type)
2080 {
2081 struct reiserfs_transaction_handle th;
2082 int ret, err;
2083
2084 /* Data block + inode block */
2085 reiserfs_write_lock(sb);
2086 ret = journal_begin(&th, sb, 2);
2087 if (ret)
2088 goto out;
2089 ret = dquot_commit_info(sb, type);
2090 err = journal_end(&th, sb, 2);
2091 if (!ret && err)
2092 ret = err;
2093 out:
2094 reiserfs_write_unlock(sb);
2095 return ret;
2096 }
2097
2098 /*
2099 * Turn on quotas during mount time - we need to find the quota file and such...
2100 */
2101 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2102 {
2103 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2104 REISERFS_SB(sb)->s_jquota_fmt, type);
2105 }
2106
2107 /*
2108 * Standard function to be called on quota_on
2109 */
2110 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2111 char *path)
2112 {
2113 int err;
2114 struct nameidata nd;
2115
2116 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2117 return -EINVAL;
2118 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2119 if (err)
2120 return err;
2121 /* Quotafile not on the same filesystem? */
2122 if (nd.mnt->mnt_sb != sb) {
2123 path_release(&nd);
2124 return -EXDEV;
2125 }
2126 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2127 if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
2128 reiserfs_warning(sb,
2129 "reiserfs: Quota file must have tail packing disabled.");
2130 path_release(&nd);
2131 return -EINVAL;
2132 }
2133 /* Not journalling quota? No more tests needed... */
2134 if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2135 !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2136 path_release(&nd);
2137 return vfs_quota_on(sb, type, format_id, path);
2138 }
2139 /* Quotafile not of fs root? */
2140 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2141 reiserfs_warning(sb,
2142 "reiserfs: Quota file not on filesystem root. "
2143 "Journalled quota will not work.");
2144 path_release(&nd);
2145 return vfs_quota_on(sb, type, format_id, path);
2146 }
2147
2148 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2149 * acquiring the locks... As quota files are never truncated and quota code
2150 * itself serializes the operations (and noone else should touch the files)
2151 * we don't have to be afraid of races */
2152 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2153 size_t len, loff_t off)
2154 {
2155 struct inode *inode = sb_dqopt(sb)->files[type];
2156 unsigned long blk = off >> sb->s_blocksize_bits;
2157 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2158 size_t toread;
2159 struct buffer_head tmp_bh, *bh;
2160 loff_t i_size = i_size_read(inode);
2161
2162 if (off > i_size)
2163 return 0;
2164 if (off + len > i_size)
2165 len = i_size - off;
2166 toread = len;
2167 while (toread > 0) {
2168 tocopy =
2169 sb->s_blocksize - offset <
2170 toread ? sb->s_blocksize - offset : toread;
2171 tmp_bh.b_state = 0;
2172 /* Quota files are without tails so we can safely use this function */
2173 reiserfs_write_lock(sb);
2174 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2175 reiserfs_write_unlock(sb);
2176 if (err)
2177 return err;
2178 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2179 memset(data, 0, tocopy);
2180 else {
2181 bh = sb_bread(sb, tmp_bh.b_blocknr);
2182 if (!bh)
2183 return -EIO;
2184 memcpy(data, bh->b_data + offset, tocopy);
2185 brelse(bh);
2186 }
2187 offset = 0;
2188 toread -= tocopy;
2189 data += tocopy;
2190 blk++;
2191 }
2192 return len;
2193 }
2194
2195 /* Write to quotafile (we know the transaction is already started and has
2196 * enough credits) */
2197 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2198 const char *data, size_t len, loff_t off)
2199 {
2200 struct inode *inode = sb_dqopt(sb)->files[type];
2201 unsigned long blk = off >> sb->s_blocksize_bits;
2202 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2203 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2204 size_t towrite = len;
2205 struct buffer_head tmp_bh, *bh;
2206
2207 mutex_lock(&inode->i_mutex);
2208 while (towrite > 0) {
2209 tocopy = sb->s_blocksize - offset < towrite ?
2210 sb->s_blocksize - offset : towrite;
2211 tmp_bh.b_state = 0;
2212 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2213 if (err)
2214 goto out;
2215 if (offset || tocopy != sb->s_blocksize)
2216 bh = sb_bread(sb, tmp_bh.b_blocknr);
2217 else
2218 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2219 if (!bh) {
2220 err = -EIO;
2221 goto out;
2222 }
2223 lock_buffer(bh);
2224 memcpy(bh->b_data + offset, data, tocopy);
2225 flush_dcache_page(bh->b_page);
2226 set_buffer_uptodate(bh);
2227 unlock_buffer(bh);
2228 reiserfs_prepare_for_journal(sb, bh, 1);
2229 journal_mark_dirty(current->journal_info, sb, bh);
2230 if (!journal_quota)
2231 reiserfs_add_ordered_list(inode, bh);
2232 brelse(bh);
2233 offset = 0;
2234 towrite -= tocopy;
2235 data += tocopy;
2236 blk++;
2237 }
2238 out:
2239 if (len == towrite)
2240 return err;
2241 if (inode->i_size < off + len - towrite)
2242 i_size_write(inode, off + len - towrite);
2243 inode->i_version++;
2244 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2245 mark_inode_dirty(inode);
2246 mutex_unlock(&inode->i_mutex);
2247 return len - towrite;
2248 }
2249
2250 #endif
2251
2252 static struct super_block *get_super_block(struct file_system_type *fs_type,
2253 int flags, const char *dev_name,
2254 void *data)
2255 {
2256 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2257 }
2258
2259 static int __init init_reiserfs_fs(void)
2260 {
2261 int ret;
2262
2263 if ((ret = init_inodecache())) {
2264 return ret;
2265 }
2266
2267 if ((ret = reiserfs_xattr_register_handlers()))
2268 goto failed_reiserfs_xattr_register_handlers;
2269
2270 reiserfs_proc_info_global_init();
2271 reiserfs_proc_register_global("version",
2272 reiserfs_global_version_in_proc);
2273
2274 ret = register_filesystem(&reiserfs_fs_type);
2275
2276 if (ret == 0) {
2277 return 0;
2278 }
2279
2280 reiserfs_xattr_unregister_handlers();
2281
2282 failed_reiserfs_xattr_register_handlers:
2283 reiserfs_proc_unregister_global("version");
2284 reiserfs_proc_info_global_done();
2285 destroy_inodecache();
2286
2287 return ret;
2288 }
2289
2290 static void __exit exit_reiserfs_fs(void)
2291 {
2292 reiserfs_xattr_unregister_handlers();
2293 reiserfs_proc_unregister_global("version");
2294 reiserfs_proc_info_global_done();
2295 unregister_filesystem(&reiserfs_fs_type);
2296 destroy_inodecache();
2297 }
2298
2299 struct file_system_type reiserfs_fs_type = {
2300 .owner = THIS_MODULE,
2301 .name = "reiserfs",
2302 .get_sb = get_super_block,
2303 .kill_sb = kill_block_super,
2304 .fs_flags = FS_REQUIRES_DEV,
2305 };
2306
2307 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2308 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2309 MODULE_LICENSE("GPL");
2310
2311 module_init(init_reiserfs_fs);
2312 module_exit(exit_reiserfs_fs);
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