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[CRYPTO] api: Mark parts of cipher interface as deprecated
[linux-2.6/x86.git] / fs / reiserfs / super.c
blob5567328f10415c85fbbe068672ed85a5f7ad0ead
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/smp_lock.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/vfs.h>
26 #include <linux/namespace.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/quotaops.h>
30
31 struct file_system_type reiserfs_fs_type;
32
33 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
34 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
35 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
36
37 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
38 {
39 return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
40 strlen(reiserfs_3_5_magic_string));
41 }
42
43 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
44 {
45 return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
46 strlen(reiserfs_3_6_magic_string));
47 }
48
49 int is_reiserfs_jr(struct reiserfs_super_block *rs)
50 {
51 return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
52 strlen(reiserfs_jr_magic_string));
53 }
54
55 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
56 {
57 return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
58 is_reiserfs_jr(rs));
59 }
60
61 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
62 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
63
64 static int reiserfs_sync_fs(struct super_block *s, int wait)
65 {
66 if (!(s->s_flags & MS_RDONLY)) {
67 struct reiserfs_transaction_handle th;
68 reiserfs_write_lock(s);
69 if (!journal_begin(&th, s, 1))
70 if (!journal_end_sync(&th, s, 1))
71 reiserfs_flush_old_commits(s);
72 s->s_dirt = 0; /* Even if it's not true.
73 * We'll loop forever in sync_supers otherwise */
74 reiserfs_write_unlock(s);
75 } else {
76 s->s_dirt = 0;
77 }
78 return 0;
79 }
80
81 static void reiserfs_write_super(struct super_block *s)
82 {
83 reiserfs_sync_fs(s, 1);
84 }
85
86 static void reiserfs_write_super_lockfs(struct super_block *s)
87 {
88 struct reiserfs_transaction_handle th;
89 reiserfs_write_lock(s);
90 if (!(s->s_flags & MS_RDONLY)) {
91 int err = journal_begin(&th, s, 1);
92 if (err) {
93 reiserfs_block_writes(&th);
94 } else {
95 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
96 1);
97 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
98 reiserfs_block_writes(&th);
99 journal_end_sync(&th, s, 1);
100 }
101 }
102 s->s_dirt = 0;
103 reiserfs_write_unlock(s);
104 }
105
106 static void reiserfs_unlockfs(struct super_block *s)
107 {
108 reiserfs_allow_writes(s);
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114 file it points to. It can either happen if unlink is completed but
115 "save unlink" removal, or if file has both unlink and truncate
116 pending and as unlink completes first (because key of "save link"
117 protecting unlink is bigger that a key lf "save link" which
118 protects truncate), so there left no items to make truncate
119 completion on */
120 static int remove_save_link_only(struct super_block *s,
121 struct reiserfs_key *key, int oid_free)
122 {
123 struct reiserfs_transaction_handle th;
124 int err;
125
126 /* we are going to do one balancing */
127 err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128 if (err)
129 return err;
130
131 reiserfs_delete_solid_item(&th, NULL, key);
132 if (oid_free)
133 /* removals are protected by direct items */
134 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136 return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146 INITIALIZE_PATH(path);
147 struct cpu_key max_cpu_key, obj_key;
148 struct reiserfs_key save_link_key;
149 int retval = 0;
150 struct item_head *ih;
151 struct buffer_head *bh;
152 int item_pos;
153 char *item;
154 int done;
155 struct inode *inode;
156 int truncate;
157 #ifdef CONFIG_QUOTA
158 int i;
159 int ms_active_set;
160 #endif
161
162 /* compose key to look for "save" links */
163 max_cpu_key.version = KEY_FORMAT_3_5;
164 max_cpu_key.on_disk_key.k_dir_id = ~0U;
165 max_cpu_key.on_disk_key.k_objectid = ~0U;
166 set_cpu_key_k_offset(&max_cpu_key, ~0U);
167 max_cpu_key.key_length = 3;
168
169 #ifdef CONFIG_QUOTA
170 /* Needed for iput() to work correctly and not trash data */
171 if (s->s_flags & MS_ACTIVE) {
172 ms_active_set = 0;
173 } else {
174 ms_active_set = 1;
175 s->s_flags |= MS_ACTIVE;
176 }
177 /* Turn on quotas so that they are updated correctly */
178 for (i = 0; i < MAXQUOTAS; i++) {
179 if (REISERFS_SB(s)->s_qf_names[i]) {
180 int ret = reiserfs_quota_on_mount(s, i);
181 if (ret < 0)
182 reiserfs_warning(s,
183 "reiserfs: cannot turn on journalled quota: error %d",
184 ret);
185 }
186 }
187 #endif
188
189 done = 0;
190 REISERFS_SB(s)->s_is_unlinked_ok = 1;
191 while (!retval) {
192 retval = search_item(s, &max_cpu_key, &path);
193 if (retval != ITEM_NOT_FOUND) {
194 reiserfs_warning(s,
195 "vs-2140: finish_unfinished: search_by_key returned %d",
196 retval);
197 break;
198 }
199
200 bh = get_last_bh(&path);
201 item_pos = get_item_pos(&path);
202 if (item_pos != B_NR_ITEMS(bh)) {
203 reiserfs_warning(s,
204 "vs-2060: finish_unfinished: wrong position found");
205 break;
206 }
207 item_pos--;
208 ih = B_N_PITEM_HEAD(bh, item_pos);
209
210 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
211 /* there are no "save" links anymore */
212 break;
213
214 save_link_key = ih->ih_key;
215 if (is_indirect_le_ih(ih))
216 truncate = 1;
217 else
218 truncate = 0;
219
220 /* reiserfs_iget needs k_dirid and k_objectid only */
221 item = B_I_PITEM(bh, ih);
222 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
223 obj_key.on_disk_key.k_objectid =
224 le32_to_cpu(ih->ih_key.k_objectid);
225 obj_key.on_disk_key.k_offset = 0;
226 obj_key.on_disk_key.k_type = 0;
227
228 pathrelse(&path);
229
230 inode = reiserfs_iget(s, &obj_key);
231 if (!inode) {
232 /* the unlink almost completed, it just did not manage to remove
233 "save" link and release objectid */
234 reiserfs_warning(s,
235 "vs-2180: finish_unfinished: iget failed for %K",
236 &obj_key);
237 retval = remove_save_link_only(s, &save_link_key, 1);
238 continue;
239 }
240
241 if (!truncate && inode->i_nlink) {
242 /* file is not unlinked */
243 reiserfs_warning(s,
244 "vs-2185: finish_unfinished: file %K is not unlinked",
245 &obj_key);
246 retval = remove_save_link_only(s, &save_link_key, 0);
247 continue;
248 }
249 DQUOT_INIT(inode);
250
251 if (truncate && S_ISDIR(inode->i_mode)) {
252 /* We got a truncate request for a dir which is impossible.
253 The only imaginable way is to execute unfinished truncate request
254 then boot into old kernel, remove the file and create dir with
255 the same key. */
256 reiserfs_warning(s,
257 "green-2101: impossible truncate on a directory %k. Please report",
258 INODE_PKEY(inode));
259 retval = remove_save_link_only(s, &save_link_key, 0);
260 truncate = 0;
261 iput(inode);
262 continue;
263 }
264
265 if (truncate) {
266 REISERFS_I(inode)->i_flags |=
267 i_link_saved_truncate_mask;
268 /* not completed truncate found. New size was committed together
269 with "save" link */
270 reiserfs_info(s, "Truncating %k to %Ld ..",
271 INODE_PKEY(inode), inode->i_size);
272 reiserfs_truncate_file(inode,
273 0
274 /*don't update modification time */
275 );
276 retval = remove_save_link(inode, truncate);
277 } else {
278 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
279 /* not completed unlink (rmdir) found */
280 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
281 /* removal gets completed in iput */
282 retval = 0;
283 }
284
285 iput(inode);
286 printk("done\n");
287 done++;
288 }
289 REISERFS_SB(s)->s_is_unlinked_ok = 0;
290
291 #ifdef CONFIG_QUOTA
292 /* Turn quotas off */
293 for (i = 0; i < MAXQUOTAS; i++) {
294 if (sb_dqopt(s)->files[i])
295 vfs_quota_off_mount(s, i);
296 }
297 if (ms_active_set)
298 /* Restore the flag back */
299 s->s_flags &= ~MS_ACTIVE;
300 #endif
301 pathrelse(&path);
302 if (done)
303 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
304 "Completed\n", done);
305 return retval;
306 }
307
308 /* to protect file being unlinked from getting lost we "safe" link files
309 being unlinked. This link will be deleted in the same transaction with last
310 item of file. mounting the filesytem we scan all these links and remove
311 files which almost got lost */
312 void add_save_link(struct reiserfs_transaction_handle *th,
313 struct inode *inode, int truncate)
314 {
315 INITIALIZE_PATH(path);
316 int retval;
317 struct cpu_key key;
318 struct item_head ih;
319 __le32 link;
320
321 BUG_ON(!th->t_trans_id);
322
323 /* file can only get one "save link" of each kind */
324 RFALSE(truncate &&
325 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
326 "saved link already exists for truncated inode %lx",
327 (long)inode->i_ino);
328 RFALSE(!truncate &&
329 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
330 "saved link already exists for unlinked inode %lx",
331 (long)inode->i_ino);
332
333 /* setup key of "save" link */
334 key.version = KEY_FORMAT_3_5;
335 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
336 key.on_disk_key.k_objectid = inode->i_ino;
337 if (!truncate) {
338 /* unlink, rmdir, rename */
339 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
340 set_cpu_key_k_type(&key, TYPE_DIRECT);
341
342 /* item head of "safe" link */
343 make_le_item_head(&ih, &key, key.version,
344 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
345 4 /*length */ , 0xffff /*free space */ );
346 } else {
347 /* truncate */
348 if (S_ISDIR(inode->i_mode))
349 reiserfs_warning(inode->i_sb,
350 "green-2102: Adding a truncate savelink for a directory %k! Please report",
351 INODE_PKEY(inode));
352 set_cpu_key_k_offset(&key, 1);
353 set_cpu_key_k_type(&key, TYPE_INDIRECT);
354
355 /* item head of "safe" link */
356 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
357 4 /*length */ , 0 /*free space */ );
358 }
359 key.key_length = 3;
360
361 /* look for its place in the tree */
362 retval = search_item(inode->i_sb, &key, &path);
363 if (retval != ITEM_NOT_FOUND) {
364 if (retval != -ENOSPC)
365 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
366 "search_by_key (%K) returned %d", &key,
367 retval);
368 pathrelse(&path);
369 return;
370 }
371
372 /* body of "save" link */
373 link = INODE_PKEY(inode)->k_dir_id;
374
375 /* put "save" link inot tree, don't charge quota to anyone */
376 retval =
377 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
378 if (retval) {
379 if (retval != -ENOSPC)
380 reiserfs_warning(inode->i_sb,
381 "vs-2120: add_save_link: insert_item returned %d",
382 retval);
383 } else {
384 if (truncate)
385 REISERFS_I(inode)->i_flags |=
386 i_link_saved_truncate_mask;
387 else
388 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
389 }
390 }
391
392 /* this opens transaction unlike add_save_link */
393 int remove_save_link(struct inode *inode, int truncate)
394 {
395 struct reiserfs_transaction_handle th;
396 struct reiserfs_key key;
397 int err;
398
399 /* we are going to do one balancing only */
400 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
401 if (err)
402 return err;
403
404 /* setup key of "save" link */
405 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
406 key.k_objectid = INODE_PKEY(inode)->k_objectid;
407 if (!truncate) {
408 /* unlink, rmdir, rename */
409 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
410 1 + inode->i_sb->s_blocksize);
411 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
412 } else {
413 /* truncate */
414 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
415 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
416 }
417
418 if ((truncate &&
419 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
420 (!truncate &&
421 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
422 /* don't take quota bytes from anywhere */
423 reiserfs_delete_solid_item(&th, NULL, &key);
424 if (!truncate) {
425 reiserfs_release_objectid(&th, inode->i_ino);
426 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
427 } else
428 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
429
430 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
431 }
432
433 static void reiserfs_put_super(struct super_block *s)
434 {
435 int i;
436 struct reiserfs_transaction_handle th;
437 th.t_trans_id = 0;
438
439 if (REISERFS_SB(s)->xattr_root) {
440 d_invalidate(REISERFS_SB(s)->xattr_root);
441 dput(REISERFS_SB(s)->xattr_root);
442 }
443
444 if (REISERFS_SB(s)->priv_root) {
445 d_invalidate(REISERFS_SB(s)->priv_root);
446 dput(REISERFS_SB(s)->priv_root);
447 }
448
449 /* change file system state to current state if it was mounted with read-write permissions */
450 if (!(s->s_flags & MS_RDONLY)) {
451 if (!journal_begin(&th, s, 10)) {
452 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
453 1);
454 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
455 REISERFS_SB(s)->s_mount_state);
456 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
457 }
458 }
459
460 /* note, journal_release checks for readonly mount, and can decide not
461 ** to do a journal_end
462 */
463 journal_release(&th, s);
464
465 for (i = 0; i < SB_BMAP_NR(s); i++)
466 brelse(SB_AP_BITMAP(s)[i].bh);
467
468 vfree(SB_AP_BITMAP(s));
469
470 brelse(SB_BUFFER_WITH_SB(s));
471
472 print_statistics(s);
473
474 if (REISERFS_SB(s)->reserved_blocks != 0) {
475 reiserfs_warning(s,
476 "green-2005: reiserfs_put_super: reserved blocks left %d",
477 REISERFS_SB(s)->reserved_blocks);
478 }
479
480 reiserfs_proc_info_done(s);
481
482 kfree(s->s_fs_info);
483 s->s_fs_info = NULL;
484
485 return;
486 }
487
488 static kmem_cache_t *reiserfs_inode_cachep;
489
490 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
491 {
492 struct reiserfs_inode_info *ei;
493 ei = (struct reiserfs_inode_info *)
494 kmem_cache_alloc(reiserfs_inode_cachep, SLAB_KERNEL);
495 if (!ei)
496 return NULL;
497 return &ei->vfs_inode;
498 }
499
500 static void reiserfs_destroy_inode(struct inode *inode)
501 {
502 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
503 }
504
505 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
506 {
507 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
508
509 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
510 SLAB_CTOR_CONSTRUCTOR) {
511 INIT_LIST_HEAD(&ei->i_prealloc_list);
512 inode_init_once(&ei->vfs_inode);
513 ei->i_acl_access = NULL;
514 ei->i_acl_default = NULL;
515 }
516 }
517
518 static int init_inodecache(void)
519 {
520 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
521 sizeof(struct
522 reiserfs_inode_info),
523 0, (SLAB_RECLAIM_ACCOUNT|
524 SLAB_MEM_SPREAD),
525 init_once, NULL);
526 if (reiserfs_inode_cachep == NULL)
527 return -ENOMEM;
528 return 0;
529 }
530
531 static void destroy_inodecache(void)
532 {
533 if (kmem_cache_destroy(reiserfs_inode_cachep))
534 reiserfs_warning(NULL,
535 "reiserfs_inode_cache: not all structures were freed");
536 }
537
538 /* we don't mark inodes dirty, we just log them */
539 static void reiserfs_dirty_inode(struct inode *inode)
540 {
541 struct reiserfs_transaction_handle th;
542
543 int err = 0;
544 if (inode->i_sb->s_flags & MS_RDONLY) {
545 reiserfs_warning(inode->i_sb,
546 "clm-6006: writing inode %lu on readonly FS",
547 inode->i_ino);
548 return;
549 }
550 reiserfs_write_lock(inode->i_sb);
551
552 /* this is really only used for atime updates, so they don't have
553 ** to be included in O_SYNC or fsync
554 */
555 err = journal_begin(&th, inode->i_sb, 1);
556 if (err) {
557 reiserfs_write_unlock(inode->i_sb);
558 return;
559 }
560 reiserfs_update_sd(&th, inode);
561 journal_end(&th, inode->i_sb, 1);
562 reiserfs_write_unlock(inode->i_sb);
563 }
564
565 static void reiserfs_clear_inode(struct inode *inode)
566 {
567 struct posix_acl *acl;
568
569 acl = REISERFS_I(inode)->i_acl_access;
570 if (acl && !IS_ERR(acl))
571 posix_acl_release(acl);
572 REISERFS_I(inode)->i_acl_access = NULL;
573
574 acl = REISERFS_I(inode)->i_acl_default;
575 if (acl && !IS_ERR(acl))
576 posix_acl_release(acl);
577 REISERFS_I(inode)->i_acl_default = NULL;
578 }
579
580 #ifdef CONFIG_QUOTA
581 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
582 size_t, loff_t);
583 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
584 loff_t);
585 #endif
586
587 static struct super_operations reiserfs_sops = {
588 .alloc_inode = reiserfs_alloc_inode,
589 .destroy_inode = reiserfs_destroy_inode,
590 .write_inode = reiserfs_write_inode,
591 .dirty_inode = reiserfs_dirty_inode,
592 .delete_inode = reiserfs_delete_inode,
593 .clear_inode = reiserfs_clear_inode,
594 .put_super = reiserfs_put_super,
595 .write_super = reiserfs_write_super,
596 .sync_fs = reiserfs_sync_fs,
597 .write_super_lockfs = reiserfs_write_super_lockfs,
598 .unlockfs = reiserfs_unlockfs,
599 .statfs = reiserfs_statfs,
600 .remount_fs = reiserfs_remount,
601 #ifdef CONFIG_QUOTA
602 .quota_read = reiserfs_quota_read,
603 .quota_write = reiserfs_quota_write,
604 #endif
605 };
606
607 #ifdef CONFIG_QUOTA
608 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
609
610 static int reiserfs_dquot_initialize(struct inode *, int);
611 static int reiserfs_dquot_drop(struct inode *);
612 static int reiserfs_write_dquot(struct dquot *);
613 static int reiserfs_acquire_dquot(struct dquot *);
614 static int reiserfs_release_dquot(struct dquot *);
615 static int reiserfs_mark_dquot_dirty(struct dquot *);
616 static int reiserfs_write_info(struct super_block *, int);
617 static int reiserfs_quota_on(struct super_block *, int, int, char *);
618
619 static struct dquot_operations reiserfs_quota_operations = {
620 .initialize = reiserfs_dquot_initialize,
621 .drop = reiserfs_dquot_drop,
622 .alloc_space = dquot_alloc_space,
623 .alloc_inode = dquot_alloc_inode,
624 .free_space = dquot_free_space,
625 .free_inode = dquot_free_inode,
626 .transfer = dquot_transfer,
627 .write_dquot = reiserfs_write_dquot,
628 .acquire_dquot = reiserfs_acquire_dquot,
629 .release_dquot = reiserfs_release_dquot,
630 .mark_dirty = reiserfs_mark_dquot_dirty,
631 .write_info = reiserfs_write_info,
632 };
633
634 static struct quotactl_ops reiserfs_qctl_operations = {
635 .quota_on = reiserfs_quota_on,
636 .quota_off = vfs_quota_off,
637 .quota_sync = vfs_quota_sync,
638 .get_info = vfs_get_dqinfo,
639 .set_info = vfs_set_dqinfo,
640 .get_dqblk = vfs_get_dqblk,
641 .set_dqblk = vfs_set_dqblk,
642 };
643 #endif
644
645 static struct export_operations reiserfs_export_ops = {
646 .encode_fh = reiserfs_encode_fh,
647 .decode_fh = reiserfs_decode_fh,
648 .get_parent = reiserfs_get_parent,
649 .get_dentry = reiserfs_get_dentry,
650 };
651
652 /* this struct is used in reiserfs_getopt () for containing the value for those
653 mount options that have values rather than being toggles. */
654 typedef struct {
655 char *value;
656 int setmask; /* bitmask which is to set on mount_options bitmask when this
657 value is found, 0 is no bits are to be changed. */
658 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
659 value is found, 0 is no bits are to be changed. This is
660 applied BEFORE setmask */
661 } arg_desc_t;
662
663 /* Set this bit in arg_required to allow empty arguments */
664 #define REISERFS_OPT_ALLOWEMPTY 31
665
666 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
667 mount options */
668 typedef struct {
669 char *option_name;
670 int arg_required; /* 0 if argument is not required, not 0 otherwise */
671 const arg_desc_t *values; /* list of values accepted by an option */
672 int setmask; /* bitmask which is to set on mount_options bitmask when this
673 value is found, 0 is no bits are to be changed. */
674 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
675 value is found, 0 is no bits are to be changed. This is
676 applied BEFORE setmask */
677 } opt_desc_t;
678
679 /* possible values for -o data= */
680 static const arg_desc_t logging_mode[] = {
681 {"ordered", 1 << REISERFS_DATA_ORDERED,
682 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
683 {"journal", 1 << REISERFS_DATA_LOG,
684 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
685 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
686 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
687 {.value = NULL}
688 };
689
690 /* possible values for -o barrier= */
691 static const arg_desc_t barrier_mode[] = {
692 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
693 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
694 {.value = NULL}
695 };
696
697 /* possible values for "-o block-allocator=" and bits which are to be set in
698 s_mount_opt of reiserfs specific part of in-core super block */
699 static const arg_desc_t balloc[] = {
700 {"noborder", 1 << REISERFS_NO_BORDER, 0},
701 {"border", 0, 1 << REISERFS_NO_BORDER},
702 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
703 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
704 {"test4", 1 << REISERFS_TEST4, 0},
705 {"notest4", 0, 1 << REISERFS_TEST4},
706 {NULL, 0, 0}
707 };
708
709 static const arg_desc_t tails[] = {
710 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
711 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
712 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
713 {NULL, 0, 0}
714 };
715
716 static const arg_desc_t error_actions[] = {
717 {"panic", 1 << REISERFS_ERROR_PANIC,
718 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
719 {"ro-remount", 1 << REISERFS_ERROR_RO,
720 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
721 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
722 {"continue", 1 << REISERFS_ERROR_CONTINUE,
723 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
724 #endif
725 {NULL, 0, 0},
726 };
727
728 int reiserfs_default_io_size = 128 * 1024; /* Default recommended I/O size is 128k.
729 There might be broken applications that are
730 confused by this. Use nolargeio mount option
731 to get usual i/o size = PAGE_SIZE.
732 */
733
734 /* proceed only one option from a list *cur - string containing of mount options
735 opts - array of options which are accepted
736 opt_arg - if option is found and requires an argument and if it is specifed
737 in the input - pointer to the argument is stored here
738 bit_flags - if option requires to set a certain bit - it is set here
739 return -1 if unknown option is found, opt->arg_required otherwise */
740 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
741 char **opt_arg, unsigned long *bit_flags)
742 {
743 char *p;
744 /* foo=bar,
745 ^ ^ ^
746 | | +-- option_end
747 | +-- arg_start
748 +-- option_start
749 */
750 const opt_desc_t *opt;
751 const arg_desc_t *arg;
752
753 p = *cur;
754
755 /* assume argument cannot contain commas */
756 *cur = strchr(p, ',');
757 if (*cur) {
758 *(*cur) = '\0';
759 (*cur)++;
760 }
761
762 if (!strncmp(p, "alloc=", 6)) {
763 /* Ugly special case, probably we should redo options parser so that
764 it can understand several arguments for some options, also so that
765 it can fill several bitfields with option values. */
766 if (reiserfs_parse_alloc_options(s, p + 6)) {
767 return -1;
768 } else {
769 return 0;
770 }
771 }
772
773 /* for every option in the list */
774 for (opt = opts; opt->option_name; opt++) {
775 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
776 if (bit_flags) {
777 if (opt->clrmask ==
778 (1 << REISERFS_UNSUPPORTED_OPT))
779 reiserfs_warning(s, "%s not supported.",
780 p);
781 else
782 *bit_flags &= ~opt->clrmask;
783 if (opt->setmask ==
784 (1 << REISERFS_UNSUPPORTED_OPT))
785 reiserfs_warning(s, "%s not supported.",
786 p);
787 else
788 *bit_flags |= opt->setmask;
789 }
790 break;
791 }
792 }
793 if (!opt->option_name) {
794 reiserfs_warning(s, "unknown mount option \"%s\"", p);
795 return -1;
796 }
797
798 p += strlen(opt->option_name);
799 switch (*p) {
800 case '=':
801 if (!opt->arg_required) {
802 reiserfs_warning(s,
803 "the option \"%s\" does not require an argument",
804 opt->option_name);
805 return -1;
806 }
807 break;
808
809 case 0:
810 if (opt->arg_required) {
811 reiserfs_warning(s,
812 "the option \"%s\" requires an argument",
813 opt->option_name);
814 return -1;
815 }
816 break;
817 default:
818 reiserfs_warning(s, "head of option \"%s\" is only correct",
819 opt->option_name);
820 return -1;
821 }
822
823 /* move to the argument, or to next option if argument is not required */
824 p++;
825
826 if (opt->arg_required
827 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828 && !strlen(p)) {
829 /* this catches "option=," if not allowed */
830 reiserfs_warning(s, "empty argument for \"%s\"",
831 opt->option_name);
832 return -1;
833 }
834
835 if (!opt->values) {
836 /* *=NULLopt_arg contains pointer to argument */
837 *opt_arg = p;
838 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
839 }
840
841 /* values possible for this option are listed in opt->values */
842 for (arg = opt->values; arg->value; arg++) {
843 if (!strcmp(p, arg->value)) {
844 if (bit_flags) {
845 *bit_flags &= ~arg->clrmask;
846 *bit_flags |= arg->setmask;
847 }
848 return opt->arg_required;
849 }
850 }
851
852 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
853 opt->option_name);
854 return -1;
855 }
856
857 /* returns 0 if something is wrong in option string, 1 - otherwise */
858 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
859 unsigned long *mount_options,
860 /* after the parsing phase, contains the
861 collection of bitflags defining what
862 mount options were selected. */
863 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
864 char **jdev_name,
865 unsigned int *commit_max_age)
866 {
867 int c;
868 char *arg = NULL;
869 char *pos;
870 opt_desc_t opts[] = {
871 /* Compatibility stuff, so that -o notail for old setups still work */
872 {"tails",.arg_required = 't',.values = tails},
873 {"notail",.clrmask =
874 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
875 {"conv",.setmask = 1 << REISERFS_CONVERT},
876 {"attrs",.setmask = 1 << REISERFS_ATTRS},
877 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
878 #ifdef CONFIG_REISERFS_FS_XATTR
879 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
880 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
881 #else
882 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
883 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
884 #endif
885 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
886 {"acl",.setmask = 1 << REISERFS_POSIXACL},
887 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
888 #else
889 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
890 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 #endif
892 {.option_name = "nolog"},
893 {"replayonly",.setmask = 1 << REPLAYONLY},
894 {"block-allocator",.arg_required = 'a',.values = balloc},
895 {"data",.arg_required = 'd',.values = logging_mode},
896 {"barrier",.arg_required = 'b',.values = barrier_mode},
897 {"resize",.arg_required = 'r',.values = NULL},
898 {"jdev",.arg_required = 'j',.values = NULL},
899 {"nolargeio",.arg_required = 'w',.values = NULL},
900 {"commit",.arg_required = 'c',.values = NULL},
901 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
902 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
903 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
904 {"errors",.arg_required = 'e',.values = error_actions},
905 {"usrjquota",.arg_required =
906 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
907 {"grpjquota",.arg_required =
908 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
909 {"jqfmt",.arg_required = 'f',.values = NULL},
910 {.option_name = NULL}
911 };
912
913 *blocks = 0;
914 if (!options || !*options)
915 /* use default configuration: create tails, journaling on, no
916 conversion to newest format */
917 return 1;
918
919 for (pos = options; pos;) {
920 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
921 if (c == -1)
922 /* wrong option is given */
923 return 0;
924
925 if (c == 'r') {
926 char *p;
927
928 p = NULL;
929 /* "resize=NNN" or "resize=auto" */
930
931 if (!strcmp(arg, "auto")) {
932 /* From JFS code, to auto-get the size. */
933 *blocks =
934 s->s_bdev->bd_inode->i_size >> s->
935 s_blocksize_bits;
936 } else {
937 *blocks = simple_strtoul(arg, &p, 0);
938 if (*p != '\0') {
939 /* NNN does not look like a number */
940 reiserfs_warning(s,
941 "reiserfs_parse_options: bad value %s",
942 arg);
943 return 0;
944 }
945 }
946 }
947
948 if (c == 'c') {
949 char *p = NULL;
950 unsigned long val = simple_strtoul(arg, &p, 0);
951 /* commit=NNN (time in seconds) */
952 if (*p != '\0' || val >= (unsigned int)-1) {
953 reiserfs_warning(s,
954 "reiserfs_parse_options: bad value %s",
955 arg);
956 return 0;
957 }
958 *commit_max_age = (unsigned int)val;
959 }
960
961 if (c == 'w') {
962 char *p = NULL;
963 int val = simple_strtoul(arg, &p, 0);
964
965 if (*p != '\0') {
966 reiserfs_warning(s,
967 "reiserfs_parse_options: non-numeric value %s for nolargeio option",
968 arg);
969 return 0;
970 }
971 if (val)
972 reiserfs_default_io_size = PAGE_SIZE;
973 else
974 reiserfs_default_io_size = 128 * 1024;
975 }
976
977 if (c == 'j') {
978 if (arg && *arg && jdev_name) {
979 if (*jdev_name) { //Hm, already assigned?
980 reiserfs_warning(s,
981 "reiserfs_parse_options: journal device was already specified to be %s",
982 *jdev_name);
983 return 0;
984 }
985 *jdev_name = arg;
986 }
987 }
988 #ifdef CONFIG_QUOTA
989 if (c == 'u' || c == 'g') {
990 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
991
992 if (sb_any_quota_enabled(s)) {
993 reiserfs_warning(s,
994 "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
995 return 0;
996 }
997 if (*arg) { /* Some filename specified? */
998 if (REISERFS_SB(s)->s_qf_names[qtype]
999 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1000 arg)) {
1001 reiserfs_warning(s,
1002 "reiserfs_parse_options: %s quota file already specified.",
1003 QTYPE2NAME(qtype));
1004 return 0;
1005 }
1006 if (strchr(arg, '/')) {
1007 reiserfs_warning(s,
1008 "reiserfs_parse_options: quotafile must be on filesystem root.");
1009 return 0;
1010 }
1011 REISERFS_SB(s)->s_qf_names[qtype] =
1012 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1013 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1014 reiserfs_warning(s,
1015 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1016 return 0;
1017 }
1018 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1019 *mount_options |= 1 << REISERFS_QUOTA;
1020 } else {
1021 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1022 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1023 }
1024 }
1025 if (c == 'f') {
1026 if (!strcmp(arg, "vfsold"))
1027 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1028 else if (!strcmp(arg, "vfsv0"))
1029 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1030 else {
1031 reiserfs_warning(s,
1032 "reiserfs_parse_options: unknown quota format specified.");
1033 return 0;
1034 }
1035 }
1036 #else
1037 if (c == 'u' || c == 'g' || c == 'f') {
1038 reiserfs_warning(s,
1039 "reiserfs_parse_options: journalled quota options not supported.");
1040 return 0;
1041 }
1042 #endif
1043 }
1044
1045 #ifdef CONFIG_QUOTA
1046 if (!REISERFS_SB(s)->s_jquota_fmt
1047 && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1048 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1049 reiserfs_warning(s,
1050 "reiserfs_parse_options: journalled quota format not specified.");
1051 return 0;
1052 }
1053 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1054 if (!(*mount_options & (1 << REISERFS_QUOTA))
1055 && sb_any_quota_enabled(s)) {
1056 reiserfs_warning(s,
1057 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1058 return 0;
1059 }
1060 #endif
1061
1062 return 1;
1063 }
1064
1065 static void switch_data_mode(struct super_block *s, unsigned long mode)
1066 {
1067 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1068 (1 << REISERFS_DATA_ORDERED) |
1069 (1 << REISERFS_DATA_WRITEBACK));
1070 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1071 }
1072
1073 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1074 {
1075 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1076 if (!reiserfs_data_log(s)) {
1077 switch_data_mode(s, REISERFS_DATA_LOG);
1078 reiserfs_info(s, "switching to journaled data mode\n");
1079 }
1080 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1081 if (!reiserfs_data_ordered(s)) {
1082 switch_data_mode(s, REISERFS_DATA_ORDERED);
1083 reiserfs_info(s, "switching to ordered data mode\n");
1084 }
1085 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1086 if (!reiserfs_data_writeback(s)) {
1087 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1088 reiserfs_info(s, "switching to writeback data mode\n");
1089 }
1090 }
1091 }
1092
1093 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1094 {
1095 int flush = (1 << REISERFS_BARRIER_FLUSH);
1096 int none = (1 << REISERFS_BARRIER_NONE);
1097 int all_barrier = flush | none;
1098
1099 if (bits & all_barrier) {
1100 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1101 if (bits & flush) {
1102 REISERFS_SB(s)->s_mount_opt |= flush;
1103 printk("reiserfs: enabling write barrier flush mode\n");
1104 } else if (bits & none) {
1105 REISERFS_SB(s)->s_mount_opt |= none;
1106 printk("reiserfs: write barriers turned off\n");
1107 }
1108 }
1109 }
1110
1111 static void handle_attrs(struct super_block *s)
1112 {
1113 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1114
1115 if (reiserfs_attrs(s)) {
1116 if (old_format_only(s)) {
1117 reiserfs_warning(s,
1118 "reiserfs: cannot support attributes on 3.5.x disk format");
1119 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1120 return;
1121 }
1122 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1123 reiserfs_warning(s,
1124 "reiserfs: cannot support attributes until flag is set in super-block");
1125 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1126 }
1127 }
1128 }
1129
1130 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1131 {
1132 struct reiserfs_super_block *rs;
1133 struct reiserfs_transaction_handle th;
1134 unsigned long blocks;
1135 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1136 unsigned long safe_mask = 0;
1137 unsigned int commit_max_age = (unsigned int)-1;
1138 struct reiserfs_journal *journal = SB_JOURNAL(s);
1139 int err;
1140 #ifdef CONFIG_QUOTA
1141 int i;
1142 #endif
1143
1144 rs = SB_DISK_SUPER_BLOCK(s);
1145
1146 if (!reiserfs_parse_options
1147 (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1148 #ifdef CONFIG_QUOTA
1149 for (i = 0; i < MAXQUOTAS; i++) {
1150 kfree(REISERFS_SB(s)->s_qf_names[i]);
1151 REISERFS_SB(s)->s_qf_names[i] = NULL;
1152 }
1153 #endif
1154 return -EINVAL;
1155 }
1156
1157 handle_attrs(s);
1158
1159 /* Add options that are safe here */
1160 safe_mask |= 1 << REISERFS_SMALLTAIL;
1161 safe_mask |= 1 << REISERFS_LARGETAIL;
1162 safe_mask |= 1 << REISERFS_NO_BORDER;
1163 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1164 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1165 safe_mask |= 1 << REISERFS_TEST4;
1166 safe_mask |= 1 << REISERFS_ATTRS;
1167 safe_mask |= 1 << REISERFS_XATTRS_USER;
1168 safe_mask |= 1 << REISERFS_POSIXACL;
1169 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1170 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1171 safe_mask |= 1 << REISERFS_ERROR_RO;
1172 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1173 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1174 safe_mask |= 1 << REISERFS_QUOTA;
1175
1176 /* Update the bitmask, taking care to keep
1177 * the bits we're not allowed to change here */
1178 REISERFS_SB(s)->s_mount_opt =
1179 (REISERFS_SB(s)->
1180 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1181
1182 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1183 journal->j_max_commit_age = commit_max_age;
1184 journal->j_max_trans_age = commit_max_age;
1185 } else if (commit_max_age == 0) {
1186 /* 0 means restore defaults. */
1187 journal->j_max_commit_age = journal->j_default_max_commit_age;
1188 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1189 }
1190
1191 if (blocks) {
1192 int rc = reiserfs_resize(s, blocks);
1193 if (rc != 0)
1194 return rc;
1195 }
1196
1197 if (*mount_flags & MS_RDONLY) {
1198 reiserfs_xattr_init(s, *mount_flags);
1199 /* remount read-only */
1200 if (s->s_flags & MS_RDONLY)
1201 /* it is read-only already */
1202 return 0;
1203 /* try to remount file system with read-only permissions */
1204 if (sb_umount_state(rs) == REISERFS_VALID_FS
1205 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1206 return 0;
1207 }
1208
1209 err = journal_begin(&th, s, 10);
1210 if (err)
1211 return err;
1212
1213 /* Mounting a rw partition read-only. */
1214 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1215 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1216 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1217 } else {
1218 /* remount read-write */
1219 if (!(s->s_flags & MS_RDONLY)) {
1220 reiserfs_xattr_init(s, *mount_flags);
1221 return 0; /* We are read-write already */
1222 }
1223
1224 if (reiserfs_is_journal_aborted(journal))
1225 return journal->j_errno;
1226
1227 handle_data_mode(s, mount_options);
1228 handle_barrier_mode(s, mount_options);
1229 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1230 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1231 err = journal_begin(&th, s, 10);
1232 if (err)
1233 return err;
1234
1235 /* Mount a partition which is read-only, read-write */
1236 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1237 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1238 s->s_flags &= ~MS_RDONLY;
1239 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1240 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1241 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1242 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1243 }
1244 /* this will force a full flush of all journal lists */
1245 SB_JOURNAL(s)->j_must_wait = 1;
1246 err = journal_end(&th, s, 10);
1247 if (err)
1248 return err;
1249 s->s_dirt = 0;
1250
1251 if (!(*mount_flags & MS_RDONLY)) {
1252 finish_unfinished(s);
1253 reiserfs_xattr_init(s, *mount_flags);
1254 }
1255
1256 return 0;
1257 }
1258
1259 /* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk.
1260 * @sb - superblock for this filesystem
1261 * @bi - the bitmap info to be loaded. Requires that bi->bh is valid.
1262 *
1263 * This routine counts how many free bits there are, finding the first zero
1264 * as a side effect. Could also be implemented as a loop of test_bit() calls, or
1265 * a loop of find_first_zero_bit() calls. This implementation is similar to
1266 * find_first_zero_bit(), but doesn't return after it finds the first bit.
1267 * Should only be called on fs mount, but should be fairly efficient anyways.
1268 *
1269 * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself
1270 * will * invariably occupt block 0 represented in the bitmap. The only
1271 * exception to this is when free_count also == 0, since there will be no
1272 * free blocks at all.
1273 */
1274
1275 static void load_bitmap_info_data(struct super_block *sb,
1276 struct reiserfs_bitmap_info *bi)
1277 {
1278 unsigned long *cur = (unsigned long *)bi->bh->b_data;
1279
1280 while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) {
1281
1282 /* No need to scan if all 0's or all 1's.
1283 * Since we're only counting 0's, we can simply ignore all 1's */
1284 if (*cur == 0) {
1285 if (bi->first_zero_hint == 0) {
1286 bi->first_zero_hint =
1287 ((char *)cur - bi->bh->b_data) << 3;
1288 }
1289 bi->free_count += sizeof(unsigned long) * 8;
1290 } else if (*cur != ~0L) {
1291 int b;
1292 for (b = 0; b < sizeof(unsigned long) * 8; b++) {
1293 if (!reiserfs_test_le_bit(b, cur)) {
1294 bi->free_count++;
1295 if (bi->first_zero_hint == 0)
1296 bi->first_zero_hint =
1297 (((char *)cur -
1298 bi->bh->b_data) << 3) + b;
1299 }
1300 }
1301 }
1302 cur++;
1303 }
1304
1305 #ifdef CONFIG_REISERFS_CHECK
1306 // This outputs a lot of unneded info on big FSes
1307 // reiserfs_warning ("bitmap loaded from block %d: %d free blocks",
1308 // bi->bh->b_blocknr, bi->free_count);
1309 #endif
1310 }
1311
1312 static int read_bitmaps(struct super_block *s)
1313 {
1314 int i, bmap_nr;
1315
1316 SB_AP_BITMAP(s) =
1317 vmalloc(sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1318 if (SB_AP_BITMAP(s) == 0)
1319 return 1;
1320 memset(SB_AP_BITMAP(s), 0,
1321 sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1322 for (i = 0, bmap_nr =
1323 REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
1324 i < SB_BMAP_NR(s); i++, bmap_nr = s->s_blocksize * 8 * i) {
1325 SB_AP_BITMAP(s)[i].bh = sb_getblk(s, bmap_nr);
1326 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
1327 ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
1328 }
1329 for (i = 0; i < SB_BMAP_NR(s); i++) {
1330 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1331 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1332 reiserfs_warning(s, "sh-2029: reiserfs read_bitmaps: "
1333 "bitmap block (#%lu) reading failed",
1334 SB_AP_BITMAP(s)[i].bh->b_blocknr);
1335 for (i = 0; i < SB_BMAP_NR(s); i++)
1336 brelse(SB_AP_BITMAP(s)[i].bh);
1337 vfree(SB_AP_BITMAP(s));
1338 SB_AP_BITMAP(s) = NULL;
1339 return 1;
1340 }
1341 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1342 }
1343 return 0;
1344 }
1345
1346 static int read_old_bitmaps(struct super_block *s)
1347 {
1348 int i;
1349 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1350 int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1; /* first of bitmap blocks */
1351
1352 /* read true bitmap */
1353 SB_AP_BITMAP(s) =
1354 vmalloc(sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1355 if (SB_AP_BITMAP(s) == 0)
1356 return 1;
1357
1358 memset(SB_AP_BITMAP(s), 0,
1359 sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1360
1361 for (i = 0; i < sb_bmap_nr(rs); i++) {
1362 SB_AP_BITMAP(s)[i].bh = sb_bread(s, bmp1 + i);
1363 if (!SB_AP_BITMAP(s)[i].bh)
1364 return 1;
1365 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1366 }
1367
1368 return 0;
1369 }
1370
1371 static int read_super_block(struct super_block *s, int offset)
1372 {
1373 struct buffer_head *bh;
1374 struct reiserfs_super_block *rs;
1375 int fs_blocksize;
1376
1377 bh = sb_bread(s, offset / s->s_blocksize);
1378 if (!bh) {
1379 reiserfs_warning(s, "sh-2006: read_super_block: "
1380 "bread failed (dev %s, block %lu, size %lu)",
1381 reiserfs_bdevname(s), offset / s->s_blocksize,
1382 s->s_blocksize);
1383 return 1;
1384 }
1385
1386 rs = (struct reiserfs_super_block *)bh->b_data;
1387 if (!is_any_reiserfs_magic_string(rs)) {
1388 brelse(bh);
1389 return 1;
1390 }
1391 //
1392 // ok, reiserfs signature (old or new) found in at the given offset
1393 //
1394 fs_blocksize = sb_blocksize(rs);
1395 brelse(bh);
1396 sb_set_blocksize(s, fs_blocksize);
1397
1398 bh = sb_bread(s, offset / s->s_blocksize);
1399 if (!bh) {
1400 reiserfs_warning(s, "sh-2007: read_super_block: "
1401 "bread failed (dev %s, block %lu, size %lu)\n",
1402 reiserfs_bdevname(s), offset / s->s_blocksize,
1403 s->s_blocksize);
1404 return 1;
1405 }
1406
1407 rs = (struct reiserfs_super_block *)bh->b_data;
1408 if (sb_blocksize(rs) != s->s_blocksize) {
1409 reiserfs_warning(s, "sh-2011: read_super_block: "
1410 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1411 reiserfs_bdevname(s),
1412 (unsigned long long)bh->b_blocknr,
1413 s->s_blocksize);
1414 brelse(bh);
1415 return 1;
1416 }
1417
1418 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1419 brelse(bh);
1420 reiserfs_warning(s,
1421 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1422 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1423 "get newer reiserfsprogs package");
1424 return 1;
1425 }
1426
1427 SB_BUFFER_WITH_SB(s) = bh;
1428 SB_DISK_SUPER_BLOCK(s) = rs;
1429
1430 if (is_reiserfs_jr(rs)) {
1431 /* magic is of non-standard journal filesystem, look at s_version to
1432 find which format is in use */
1433 if (sb_version(rs) == REISERFS_VERSION_2)
1434 reiserfs_warning(s,
1435 "read_super_block: found reiserfs format \"3.6\""
1436 " with non-standard journal");
1437 else if (sb_version(rs) == REISERFS_VERSION_1)
1438 reiserfs_warning(s,
1439 "read_super_block: found reiserfs format \"3.5\""
1440 " with non-standard journal");
1441 else {
1442 reiserfs_warning(s,
1443 "sh-2012: read_super_block: found unknown "
1444 "format \"%u\" of reiserfs with non-standard magic",
1445 sb_version(rs));
1446 return 1;
1447 }
1448 } else
1449 /* s_version of standard format may contain incorrect information,
1450 so we just look at the magic string */
1451 reiserfs_info(s,
1452 "found reiserfs format \"%s\" with standard journal\n",
1453 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1454
1455 s->s_op = &reiserfs_sops;
1456 s->s_export_op = &reiserfs_export_ops;
1457 #ifdef CONFIG_QUOTA
1458 s->s_qcop = &reiserfs_qctl_operations;
1459 s->dq_op = &reiserfs_quota_operations;
1460 #endif
1461
1462 /* new format is limited by the 32 bit wide i_blocks field, want to
1463 ** be one full block below that.
1464 */
1465 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1466 return 0;
1467 }
1468
1469 /* after journal replay, reread all bitmap and super blocks */
1470 static int reread_meta_blocks(struct super_block *s)
1471 {
1472 int i;
1473 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1474 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1475 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1476 reiserfs_warning(s,
1477 "reread_meta_blocks, error reading the super");
1478 return 1;
1479 }
1480
1481 for (i = 0; i < SB_BMAP_NR(s); i++) {
1482 ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh));
1483 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1484 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1485 reiserfs_warning(s,
1486 "reread_meta_blocks, error reading bitmap block number %d at %llu",
1487 i,
1488 (unsigned long long)SB_AP_BITMAP(s)[i].
1489 bh->b_blocknr);
1490 return 1;
1491 }
1492 }
1493 return 0;
1494
1495 }
1496
1497 /////////////////////////////////////////////////////
1498 // hash detection stuff
1499
1500 // if root directory is empty - we set default - Yura's - hash and
1501 // warn about it
1502 // FIXME: we look for only one name in a directory. If tea and yura
1503 // bith have the same value - we ask user to send report to the
1504 // mailing list
1505 static __u32 find_hash_out(struct super_block *s)
1506 {
1507 int retval;
1508 struct inode *inode;
1509 struct cpu_key key;
1510 INITIALIZE_PATH(path);
1511 struct reiserfs_dir_entry de;
1512 __u32 hash = DEFAULT_HASH;
1513
1514 inode = s->s_root->d_inode;
1515
1516 do { // Some serious "goto"-hater was there ;)
1517 u32 teahash, r5hash, yurahash;
1518
1519 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1520 retval = search_by_entry_key(s, &key, &path, &de);
1521 if (retval == IO_ERROR) {
1522 pathrelse(&path);
1523 return UNSET_HASH;
1524 }
1525 if (retval == NAME_NOT_FOUND)
1526 de.de_entry_num--;
1527 set_de_name_and_namelen(&de);
1528 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1529 /* allow override in this case */
1530 if (reiserfs_rupasov_hash(s)) {
1531 hash = YURA_HASH;
1532 }
1533 reiserfs_warning(s, "FS seems to be empty, autodetect "
1534 "is using the default hash");
1535 break;
1536 }
1537 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1538 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1539 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1540 if (((teahash == r5hash)
1541 &&
1542 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1543 == r5hash)) || ((teahash == yurahash)
1544 && (yurahash ==
1545 GET_HASH_VALUE(deh_offset
1546 (&
1547 (de.
1548 de_deh[de.
1549 de_entry_num])))))
1550 || ((r5hash == yurahash)
1551 && (yurahash ==
1552 GET_HASH_VALUE(deh_offset
1553 (&(de.de_deh[de.de_entry_num])))))) {
1554 reiserfs_warning(s,
1555 "Unable to automatically detect hash function. "
1556 "Please mount with -o hash={tea,rupasov,r5}",
1557 reiserfs_bdevname(s));
1558 hash = UNSET_HASH;
1559 break;
1560 }
1561 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1562 yurahash)
1563 hash = YURA_HASH;
1564 else if (GET_HASH_VALUE
1565 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1566 hash = TEA_HASH;
1567 else if (GET_HASH_VALUE
1568 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1569 hash = R5_HASH;
1570 else {
1571 reiserfs_warning(s, "Unrecognised hash function");
1572 hash = UNSET_HASH;
1573 }
1574 } while (0);
1575
1576 pathrelse(&path);
1577 return hash;
1578 }
1579
1580 // finds out which hash names are sorted with
1581 static int what_hash(struct super_block *s)
1582 {
1583 __u32 code;
1584
1585 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1586
1587 /* reiserfs_hash_detect() == true if any of the hash mount options
1588 ** were used. We must check them to make sure the user isn't
1589 ** using a bad hash value
1590 */
1591 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1592 code = find_hash_out(s);
1593
1594 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1595 /* detection has found the hash, and we must check against the
1596 ** mount options
1597 */
1598 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1599 reiserfs_warning(s, "Error, %s hash detected, "
1600 "unable to force rupasov hash",
1601 reiserfs_hashname(code));
1602 code = UNSET_HASH;
1603 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1604 reiserfs_warning(s, "Error, %s hash detected, "
1605 "unable to force tea hash",
1606 reiserfs_hashname(code));
1607 code = UNSET_HASH;
1608 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1609 reiserfs_warning(s, "Error, %s hash detected, "
1610 "unable to force r5 hash",
1611 reiserfs_hashname(code));
1612 code = UNSET_HASH;
1613 }
1614 } else {
1615 /* find_hash_out was not called or could not determine the hash */
1616 if (reiserfs_rupasov_hash(s)) {
1617 code = YURA_HASH;
1618 } else if (reiserfs_tea_hash(s)) {
1619 code = TEA_HASH;
1620 } else if (reiserfs_r5_hash(s)) {
1621 code = R5_HASH;
1622 }
1623 }
1624
1625 /* if we are mounted RW, and we have a new valid hash code, update
1626 ** the super
1627 */
1628 if (code != UNSET_HASH &&
1629 !(s->s_flags & MS_RDONLY) &&
1630 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1631 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1632 }
1633 return code;
1634 }
1635
1636 // return pointer to appropriate function
1637 static hashf_t hash_function(struct super_block *s)
1638 {
1639 switch (what_hash(s)) {
1640 case TEA_HASH:
1641 reiserfs_info(s, "Using tea hash to sort names\n");
1642 return keyed_hash;
1643 case YURA_HASH:
1644 reiserfs_info(s, "Using rupasov hash to sort names\n");
1645 return yura_hash;
1646 case R5_HASH:
1647 reiserfs_info(s, "Using r5 hash to sort names\n");
1648 return r5_hash;
1649 }
1650 return NULL;
1651 }
1652
1653 // this is used to set up correct value for old partitions
1654 static int function2code(hashf_t func)
1655 {
1656 if (func == keyed_hash)
1657 return TEA_HASH;
1658 if (func == yura_hash)
1659 return YURA_HASH;
1660 if (func == r5_hash)
1661 return R5_HASH;
1662
1663 BUG(); // should never happen
1664
1665 return 0;
1666 }
1667
1668 #define SWARN(silent, s, ...) \
1669 if (!(silent)) \
1670 reiserfs_warning (s, __VA_ARGS__)
1671
1672 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1673 {
1674 struct inode *root_inode;
1675 int j;
1676 struct reiserfs_transaction_handle th;
1677 int old_format = 0;
1678 unsigned long blocks;
1679 unsigned int commit_max_age = 0;
1680 int jinit_done = 0;
1681 struct reiserfs_iget_args args;
1682 struct reiserfs_super_block *rs;
1683 char *jdev_name;
1684 struct reiserfs_sb_info *sbi;
1685 int errval = -EINVAL;
1686
1687 sbi = kmalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1688 if (!sbi) {
1689 errval = -ENOMEM;
1690 goto error;
1691 }
1692 s->s_fs_info = sbi;
1693 memset(sbi, 0, sizeof(struct reiserfs_sb_info));
1694 /* Set default values for options: non-aggressive tails, RO on errors */
1695 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1696 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1697 /* no preallocation minimum, be smart in
1698 reiserfs_file_write instead */
1699 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1700 /* Preallocate by 16 blocks (17-1) at once */
1701 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1702 /* Initialize the rwsem for xattr dir */
1703 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1704
1705 /* setup default block allocator options */
1706 reiserfs_init_alloc_options(s);
1707
1708 jdev_name = NULL;
1709 if (reiserfs_parse_options
1710 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1711 &commit_max_age) == 0) {
1712 goto error;
1713 }
1714
1715 if (blocks) {
1716 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1717 "for remount only");
1718 goto error;
1719 }
1720
1721 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1722 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1723 old_format = 1;
1724 /* try new format (64-th 1k block), which can contain reiserfs super block */
1725 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1726 SWARN(silent, s,
1727 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1728 reiserfs_bdevname(s));
1729 goto error;
1730 }
1731
1732 rs = SB_DISK_SUPER_BLOCK(s);
1733 /* Let's do basic sanity check to verify that underlying device is not
1734 smaller than the filesystem. If the check fails then abort and scream,
1735 because bad stuff will happen otherwise. */
1736 if (s->s_bdev && s->s_bdev->bd_inode
1737 && i_size_read(s->s_bdev->bd_inode) <
1738 sb_block_count(rs) * sb_blocksize(rs)) {
1739 SWARN(silent, s,
1740 "Filesystem on %s cannot be mounted because it is bigger than the device",
1741 reiserfs_bdevname(s));
1742 SWARN(silent, s,
1743 "You may need to run fsck or increase size of your LVM partition");
1744 SWARN(silent, s,
1745 "Or may be you forgot to reboot after fdisk when it told you to");
1746 goto error;
1747 }
1748
1749 sbi->s_mount_state = SB_REISERFS_STATE(s);
1750 sbi->s_mount_state = REISERFS_VALID_FS;
1751
1752 if (old_format ? read_old_bitmaps(s) : read_bitmaps(s)) {
1753 SWARN(silent, s,
1754 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1755 goto error;
1756 }
1757 #ifdef CONFIG_REISERFS_CHECK
1758 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1759 SWARN(silent, s, "- it is slow mode for debugging.");
1760 #endif
1761
1762 /* make data=ordered the default */
1763 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1764 !reiserfs_data_writeback(s)) {
1765 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1766 }
1767
1768 if (reiserfs_data_log(s)) {
1769 reiserfs_info(s, "using journaled data mode\n");
1770 } else if (reiserfs_data_ordered(s)) {
1771 reiserfs_info(s, "using ordered data mode\n");
1772 } else {
1773 reiserfs_info(s, "using writeback data mode\n");
1774 }
1775 if (reiserfs_barrier_flush(s)) {
1776 printk("reiserfs: using flush barriers\n");
1777 }
1778 // set_device_ro(s->s_dev, 1) ;
1779 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1780 SWARN(silent, s,
1781 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1782 goto error;
1783 } else {
1784 jinit_done = 1; /* once this is set, journal_release must be called
1785 ** if we error out of the mount
1786 */
1787 }
1788 if (reread_meta_blocks(s)) {
1789 SWARN(silent, s,
1790 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1791 goto error;
1792 }
1793
1794 if (replay_only(s))
1795 goto error;
1796
1797 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1798 SWARN(silent, s,
1799 "clm-7000: Detected readonly device, marking FS readonly");
1800 s->s_flags |= MS_RDONLY;
1801 }
1802 args.objectid = REISERFS_ROOT_OBJECTID;
1803 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1804 root_inode =
1805 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1806 reiserfs_init_locked_inode, (void *)(&args));
1807 if (!root_inode) {
1808 SWARN(silent, s,
1809 "jmacd-10: reiserfs_fill_super: get root inode failed");
1810 goto error;
1811 }
1812
1813 if (root_inode->i_state & I_NEW) {
1814 reiserfs_read_locked_inode(root_inode, &args);
1815 unlock_new_inode(root_inode);
1816 }
1817
1818 s->s_root = d_alloc_root(root_inode);
1819 if (!s->s_root) {
1820 iput(root_inode);
1821 goto error;
1822 }
1823 // define and initialize hash function
1824 sbi->s_hash_function = hash_function(s);
1825 if (sbi->s_hash_function == NULL) {
1826 dput(s->s_root);
1827 s->s_root = NULL;
1828 goto error;
1829 }
1830
1831 if (is_reiserfs_3_5(rs)
1832 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1833 set_bit(REISERFS_3_5, &(sbi->s_properties));
1834 else
1835 set_bit(REISERFS_3_6, &(sbi->s_properties));
1836
1837 if (!(s->s_flags & MS_RDONLY)) {
1838
1839 errval = journal_begin(&th, s, 1);
1840 if (errval) {
1841 dput(s->s_root);
1842 s->s_root = NULL;
1843 goto error;
1844 }
1845 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1846
1847 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1848 set_sb_fs_state(rs, 0);
1849
1850 if (old_format_only(s)) {
1851 /* filesystem of format 3.5 either with standard or non-standard
1852 journal */
1853 if (convert_reiserfs(s)) {
1854 /* and -o conv is given */
1855 if (!silent)
1856 reiserfs_info(s,
1857 "converting 3.5 filesystem to the 3.6 format");
1858
1859 if (is_reiserfs_3_5(rs))
1860 /* put magic string of 3.6 format. 2.2 will not be able to
1861 mount this filesystem anymore */
1862 memcpy(rs->s_v1.s_magic,
1863 reiserfs_3_6_magic_string,
1864 sizeof
1865 (reiserfs_3_6_magic_string));
1866
1867 set_sb_version(rs, REISERFS_VERSION_2);
1868 reiserfs_convert_objectid_map_v1(s);
1869 set_bit(REISERFS_3_6, &(sbi->s_properties));
1870 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1871 } else if (!silent) {
1872 reiserfs_info(s, "using 3.5.x disk format\n");
1873 }
1874 }
1875
1876 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1877 errval = journal_end(&th, s, 1);
1878 if (errval) {
1879 dput(s->s_root);
1880 s->s_root = NULL;
1881 goto error;
1882 }
1883
1884 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1885 dput(s->s_root);
1886 s->s_root = NULL;
1887 goto error;
1888 }
1889
1890 /* look for files which were to be removed in previous session */
1891 finish_unfinished(s);
1892 } else {
1893 if (old_format_only(s) && !silent) {
1894 reiserfs_info(s, "using 3.5.x disk format\n");
1895 }
1896
1897 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1898 dput(s->s_root);
1899 s->s_root = NULL;
1900 goto error;
1901 }
1902 }
1903 // mark hash in super block: it could be unset. overwrite should be ok
1904 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1905
1906 handle_attrs(s);
1907
1908 reiserfs_proc_info_init(s);
1909
1910 init_waitqueue_head(&(sbi->s_wait));
1911 spin_lock_init(&sbi->bitmap_lock);
1912
1913 return (0);
1914
1915 error:
1916 if (jinit_done) { /* kill the commit thread, free journal ram */
1917 journal_release_error(NULL, s);
1918 }
1919 if (SB_DISK_SUPER_BLOCK(s)) {
1920 for (j = 0; j < SB_BMAP_NR(s); j++) {
1921 if (SB_AP_BITMAP(s))
1922 brelse(SB_AP_BITMAP(s)[j].bh);
1923 }
1924 vfree(SB_AP_BITMAP(s));
1925 }
1926 if (SB_BUFFER_WITH_SB(s))
1927 brelse(SB_BUFFER_WITH_SB(s));
1928 #ifdef CONFIG_QUOTA
1929 for (j = 0; j < MAXQUOTAS; j++) {
1930 kfree(sbi->s_qf_names[j]);
1931 sbi->s_qf_names[j] = NULL;
1932 }
1933 #endif
1934 kfree(sbi);
1935
1936 s->s_fs_info = NULL;
1937 return errval;
1938 }
1939
1940 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1941 {
1942 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1943
1944 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1945 buf->f_bfree = sb_free_blocks(rs);
1946 buf->f_bavail = buf->f_bfree;
1947 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1948 buf->f_bsize = dentry->d_sb->s_blocksize;
1949 /* changed to accommodate gcc folks. */
1950 buf->f_type = REISERFS_SUPER_MAGIC;
1951 return 0;
1952 }
1953
1954 #ifdef CONFIG_QUOTA
1955 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1956 {
1957 struct reiserfs_transaction_handle th;
1958 int ret, err;
1959
1960 /* We may create quota structure so we need to reserve enough blocks */
1961 reiserfs_write_lock(inode->i_sb);
1962 ret =
1963 journal_begin(&th, inode->i_sb,
1964 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1965 if (ret)
1966 goto out;
1967 ret = dquot_initialize(inode, type);
1968 err =
1969 journal_end(&th, inode->i_sb,
1970 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1971 if (!ret && err)
1972 ret = err;
1973 out:
1974 reiserfs_write_unlock(inode->i_sb);
1975 return ret;
1976 }
1977
1978 static int reiserfs_dquot_drop(struct inode *inode)
1979 {
1980 struct reiserfs_transaction_handle th;
1981 int ret, err;
1982
1983 /* We may delete quota structure so we need to reserve enough blocks */
1984 reiserfs_write_lock(inode->i_sb);
1985 ret =
1986 journal_begin(&th, inode->i_sb,
1987 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1988 if (ret)
1989 goto out;
1990 ret = dquot_drop(inode);
1991 err =
1992 journal_end(&th, inode->i_sb,
1993 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1994 if (!ret && err)
1995 ret = err;
1996 out:
1997 reiserfs_write_unlock(inode->i_sb);
1998 return ret;
1999 }
2000
2001 static int reiserfs_write_dquot(struct dquot *dquot)
2002 {
2003 struct reiserfs_transaction_handle th;
2004 int ret, err;
2005
2006 reiserfs_write_lock(dquot->dq_sb);
2007 ret =
2008 journal_begin(&th, dquot->dq_sb,
2009 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2010 if (ret)
2011 goto out;
2012 ret = dquot_commit(dquot);
2013 err =
2014 journal_end(&th, dquot->dq_sb,
2015 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2016 if (!ret && err)
2017 ret = err;
2018 out:
2019 reiserfs_write_unlock(dquot->dq_sb);
2020 return ret;
2021 }
2022
2023 static int reiserfs_acquire_dquot(struct dquot *dquot)
2024 {
2025 struct reiserfs_transaction_handle th;
2026 int ret, err;
2027
2028 reiserfs_write_lock(dquot->dq_sb);
2029 ret =
2030 journal_begin(&th, dquot->dq_sb,
2031 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2032 if (ret)
2033 goto out;
2034 ret = dquot_acquire(dquot);
2035 err =
2036 journal_end(&th, dquot->dq_sb,
2037 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2038 if (!ret && err)
2039 ret = err;
2040 out:
2041 reiserfs_write_unlock(dquot->dq_sb);
2042 return ret;
2043 }
2044
2045 static int reiserfs_release_dquot(struct dquot *dquot)
2046 {
2047 struct reiserfs_transaction_handle th;
2048 int ret, err;
2049
2050 reiserfs_write_lock(dquot->dq_sb);
2051 ret =
2052 journal_begin(&th, dquot->dq_sb,
2053 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2054 if (ret)
2055 goto out;
2056 ret = dquot_release(dquot);
2057 err =
2058 journal_end(&th, dquot->dq_sb,
2059 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2060 if (!ret && err)
2061 ret = err;
2062 out:
2063 reiserfs_write_unlock(dquot->dq_sb);
2064 return ret;
2065 }
2066
2067 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2068 {
2069 /* Are we journalling quotas? */
2070 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2071 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2072 dquot_mark_dquot_dirty(dquot);
2073 return reiserfs_write_dquot(dquot);
2074 } else
2075 return dquot_mark_dquot_dirty(dquot);
2076 }
2077
2078 static int reiserfs_write_info(struct super_block *sb, int type)
2079 {
2080 struct reiserfs_transaction_handle th;
2081 int ret, err;
2082
2083 /* Data block + inode block */
2084 reiserfs_write_lock(sb);
2085 ret = journal_begin(&th, sb, 2);
2086 if (ret)
2087 goto out;
2088 ret = dquot_commit_info(sb, type);
2089 err = journal_end(&th, sb, 2);
2090 if (!ret && err)
2091 ret = err;
2092 out:
2093 reiserfs_write_unlock(sb);
2094 return ret;
2095 }
2096
2097 /*
2098 * Turn on quotas during mount time - we need to find the quota file and such...
2099 */
2100 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2101 {
2102 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2103 REISERFS_SB(sb)->s_jquota_fmt, type);
2104 }
2105
2106 /*
2107 * Standard function to be called on quota_on
2108 */
2109 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2110 char *path)
2111 {
2112 int err;
2113 struct nameidata nd;
2114
2115 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2116 return -EINVAL;
2117 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2118 if (err)
2119 return err;
2120 /* Quotafile not on the same filesystem? */
2121 if (nd.mnt->mnt_sb != sb) {
2122 path_release(&nd);
2123 return -EXDEV;
2124 }
2125 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2126 if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
2127 reiserfs_warning(sb,
2128 "reiserfs: Quota file must have tail packing disabled.");
2129 path_release(&nd);
2130 return -EINVAL;
2131 }
2132 /* Not journalling quota? No more tests needed... */
2133 if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2134 !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2135 path_release(&nd);
2136 return vfs_quota_on(sb, type, format_id, path);
2137 }
2138 /* Quotafile not of fs root? */
2139 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2140 reiserfs_warning(sb,
2141 "reiserfs: Quota file not on filesystem root. "
2142 "Journalled quota will not work.");
2143 path_release(&nd);
2144 return vfs_quota_on(sb, type, format_id, path);
2145 }
2146
2147 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2148 * acquiring the locks... As quota files are never truncated and quota code
2149 * itself serializes the operations (and noone else should touch the files)
2150 * we don't have to be afraid of races */
2151 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2152 size_t len, loff_t off)
2153 {
2154 struct inode *inode = sb_dqopt(sb)->files[type];
2155 unsigned long blk = off >> sb->s_blocksize_bits;
2156 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2157 size_t toread;
2158 struct buffer_head tmp_bh, *bh;
2159 loff_t i_size = i_size_read(inode);
2160
2161 if (off > i_size)
2162 return 0;
2163 if (off + len > i_size)
2164 len = i_size - off;
2165 toread = len;
2166 while (toread > 0) {
2167 tocopy =
2168 sb->s_blocksize - offset <
2169 toread ? sb->s_blocksize - offset : toread;
2170 tmp_bh.b_state = 0;
2171 /* Quota files are without tails so we can safely use this function */
2172 reiserfs_write_lock(sb);
2173 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2174 reiserfs_write_unlock(sb);
2175 if (err)
2176 return err;
2177 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2178 memset(data, 0, tocopy);
2179 else {
2180 bh = sb_bread(sb, tmp_bh.b_blocknr);
2181 if (!bh)
2182 return -EIO;
2183 memcpy(data, bh->b_data + offset, tocopy);
2184 brelse(bh);
2185 }
2186 offset = 0;
2187 toread -= tocopy;
2188 data += tocopy;
2189 blk++;
2190 }
2191 return len;
2192 }
2193
2194 /* Write to quotafile (we know the transaction is already started and has
2195 * enough credits) */
2196 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2197 const char *data, size_t len, loff_t off)
2198 {
2199 struct inode *inode = sb_dqopt(sb)->files[type];
2200 unsigned long blk = off >> sb->s_blocksize_bits;
2201 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2202 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2203 size_t towrite = len;
2204 struct buffer_head tmp_bh, *bh;
2205
2206 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2207 while (towrite > 0) {
2208 tocopy = sb->s_blocksize - offset < towrite ?
2209 sb->s_blocksize - offset : towrite;
2210 tmp_bh.b_state = 0;
2211 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2212 if (err)
2213 goto out;
2214 if (offset || tocopy != sb->s_blocksize)
2215 bh = sb_bread(sb, tmp_bh.b_blocknr);
2216 else
2217 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2218 if (!bh) {
2219 err = -EIO;
2220 goto out;
2221 }
2222 lock_buffer(bh);
2223 memcpy(bh->b_data + offset, data, tocopy);
2224 flush_dcache_page(bh->b_page);
2225 set_buffer_uptodate(bh);
2226 unlock_buffer(bh);
2227 reiserfs_prepare_for_journal(sb, bh, 1);
2228 journal_mark_dirty(current->journal_info, sb, bh);
2229 if (!journal_quota)
2230 reiserfs_add_ordered_list(inode, bh);
2231 brelse(bh);
2232 offset = 0;
2233 towrite -= tocopy;
2234 data += tocopy;
2235 blk++;
2236 }
2237 out:
2238 if (len == towrite)
2239 return err;
2240 if (inode->i_size < off + len - towrite)
2241 i_size_write(inode, off + len - towrite);
2242 inode->i_version++;
2243 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2244 mark_inode_dirty(inode);
2245 mutex_unlock(&inode->i_mutex);
2246 return len - towrite;
2247 }
2248
2249 #endif
2250
2251 static int get_super_block(struct file_system_type *fs_type,
2252 int flags, const char *dev_name,
2253 void *data, struct vfsmount *mnt)
2254 {
2255 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2256 mnt);
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);
x86 "subsystem" repository