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sgi-xp: isolate activate IRQ's hardware specific components
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob879e54d35c2d49400a48b3d748a69c92934acb7a
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 *
4 * Trivial changes by Alan Cox to add the LFS fixes
5 *
6 * Trivial Changes:
7 * Rights granted to Hans Reiser to redistribute under other terms providing
8 * he accepts all liability including but not limited to patent, fitness
9 * for purpose, and direct or indirect claims arising from failure to perform.
10 *
11 * NO WARRANTY
12 */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #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 dentry *dentry, 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, last_inode_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 memset(&last_inode_key, 0, sizeof(last_inode_key));
171
172 #ifdef CONFIG_QUOTA
173 /* Needed for iput() to work correctly and not trash data */
174 if (s->s_flags & MS_ACTIVE) {
175 ms_active_set = 0;
176 } else {
177 ms_active_set = 1;
178 s->s_flags |= MS_ACTIVE;
179 }
180 /* Turn on quotas so that they are updated correctly */
181 for (i = 0; i < MAXQUOTAS; i++) {
182 if (REISERFS_SB(s)->s_qf_names[i]) {
183 int ret = reiserfs_quota_on_mount(s, i);
184 if (ret < 0)
185 reiserfs_warning(s,
186 "reiserfs: cannot turn on journaled quota: error %d",
187 ret);
188 }
189 }
190 #endif
191
192 done = 0;
193 REISERFS_SB(s)->s_is_unlinked_ok = 1;
194 while (!retval) {
195 retval = search_item(s, &max_cpu_key, &path);
196 if (retval != ITEM_NOT_FOUND) {
197 reiserfs_warning(s,
198 "vs-2140: finish_unfinished: search_by_key returned %d",
199 retval);
200 break;
201 }
202
203 bh = get_last_bh(&path);
204 item_pos = get_item_pos(&path);
205 if (item_pos != B_NR_ITEMS(bh)) {
206 reiserfs_warning(s,
207 "vs-2060: finish_unfinished: wrong position found");
208 break;
209 }
210 item_pos--;
211 ih = B_N_PITEM_HEAD(bh, item_pos);
212
213 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
214 /* there are no "save" links anymore */
215 break;
216
217 save_link_key = ih->ih_key;
218 if (is_indirect_le_ih(ih))
219 truncate = 1;
220 else
221 truncate = 0;
222
223 /* reiserfs_iget needs k_dirid and k_objectid only */
224 item = B_I_PITEM(bh, ih);
225 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
226 obj_key.on_disk_key.k_objectid =
227 le32_to_cpu(ih->ih_key.k_objectid);
228 obj_key.on_disk_key.k_offset = 0;
229 obj_key.on_disk_key.k_type = 0;
230
231 pathrelse(&path);
232
233 inode = reiserfs_iget(s, &obj_key);
234 if (!inode) {
235 /* the unlink almost completed, it just did not manage to remove
236 "save" link and release objectid */
237 reiserfs_warning(s,
238 "vs-2180: finish_unfinished: iget failed for %K",
239 &obj_key);
240 retval = remove_save_link_only(s, &save_link_key, 1);
241 continue;
242 }
243
244 if (!truncate && inode->i_nlink) {
245 /* file is not unlinked */
246 reiserfs_warning(s,
247 "vs-2185: finish_unfinished: file %K is not unlinked",
248 &obj_key);
249 retval = remove_save_link_only(s, &save_link_key, 0);
250 continue;
251 }
252 DQUOT_INIT(inode);
253
254 if (truncate && S_ISDIR(inode->i_mode)) {
255 /* We got a truncate request for a dir which is impossible.
256 The only imaginable way is to execute unfinished truncate request
257 then boot into old kernel, remove the file and create dir with
258 the same key. */
259 reiserfs_warning(s,
260 "green-2101: impossible truncate on a directory %k. Please report",
261 INODE_PKEY(inode));
262 retval = remove_save_link_only(s, &save_link_key, 0);
263 truncate = 0;
264 iput(inode);
265 continue;
266 }
267
268 if (truncate) {
269 REISERFS_I(inode)->i_flags |=
270 i_link_saved_truncate_mask;
271 /* not completed truncate found. New size was committed together
272 with "save" link */
273 reiserfs_info(s, "Truncating %k to %Ld ..",
274 INODE_PKEY(inode), inode->i_size);
275 reiserfs_truncate_file(inode,
276 0
277 /*don't update modification time */
278 );
279 retval = remove_save_link(inode, truncate);
280 } else {
281 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
282 /* not completed unlink (rmdir) found */
283 reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
284 if (memcmp(&last_inode_key, INODE_PKEY(inode),
285 sizeof(last_inode_key))){
286 last_inode_key = *INODE_PKEY(inode);
287 /* removal gets completed in iput */
288 retval = 0;
289 } else {
290 reiserfs_warning(s, "Dead loop in "
291 "finish_unfinished detected, "
292 "just remove save link\n");
293 retval = remove_save_link_only(s,
294 &save_link_key, 0);
295 }
296 }
297
298 iput(inode);
299 printk("done\n");
300 done++;
301 }
302 REISERFS_SB(s)->s_is_unlinked_ok = 0;
303
304 #ifdef CONFIG_QUOTA
305 /* Turn quotas off */
306 for (i = 0; i < MAXQUOTAS; i++) {
307 if (sb_dqopt(s)->files[i])
308 vfs_quota_off(s, i, 0);
309 }
310 if (ms_active_set)
311 /* Restore the flag back */
312 s->s_flags &= ~MS_ACTIVE;
313 #endif
314 pathrelse(&path);
315 if (done)
316 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
317 "Completed\n", done);
318 return retval;
319 }
320
321 /* to protect file being unlinked from getting lost we "safe" link files
322 being unlinked. This link will be deleted in the same transaction with last
323 item of file. mounting the filesystem we scan all these links and remove
324 files which almost got lost */
325 void add_save_link(struct reiserfs_transaction_handle *th,
326 struct inode *inode, int truncate)
327 {
328 INITIALIZE_PATH(path);
329 int retval;
330 struct cpu_key key;
331 struct item_head ih;
332 __le32 link;
333
334 BUG_ON(!th->t_trans_id);
335
336 /* file can only get one "save link" of each kind */
337 RFALSE(truncate &&
338 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
339 "saved link already exists for truncated inode %lx",
340 (long)inode->i_ino);
341 RFALSE(!truncate &&
342 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
343 "saved link already exists for unlinked inode %lx",
344 (long)inode->i_ino);
345
346 /* setup key of "save" link */
347 key.version = KEY_FORMAT_3_5;
348 key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
349 key.on_disk_key.k_objectid = inode->i_ino;
350 if (!truncate) {
351 /* unlink, rmdir, rename */
352 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
353 set_cpu_key_k_type(&key, TYPE_DIRECT);
354
355 /* item head of "safe" link */
356 make_le_item_head(&ih, &key, key.version,
357 1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
358 4 /*length */ , 0xffff /*free space */ );
359 } else {
360 /* truncate */
361 if (S_ISDIR(inode->i_mode))
362 reiserfs_warning(inode->i_sb,
363 "green-2102: Adding a truncate savelink for a directory %k! Please report",
364 INODE_PKEY(inode));
365 set_cpu_key_k_offset(&key, 1);
366 set_cpu_key_k_type(&key, TYPE_INDIRECT);
367
368 /* item head of "safe" link */
369 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
370 4 /*length */ , 0 /*free space */ );
371 }
372 key.key_length = 3;
373
374 /* look for its place in the tree */
375 retval = search_item(inode->i_sb, &key, &path);
376 if (retval != ITEM_NOT_FOUND) {
377 if (retval != -ENOSPC)
378 reiserfs_warning(inode->i_sb, "vs-2100: add_save_link:"
379 "search_by_key (%K) returned %d", &key,
380 retval);
381 pathrelse(&path);
382 return;
383 }
384
385 /* body of "save" link */
386 link = INODE_PKEY(inode)->k_dir_id;
387
388 /* put "save" link inot tree, don't charge quota to anyone */
389 retval =
390 reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
391 if (retval) {
392 if (retval != -ENOSPC)
393 reiserfs_warning(inode->i_sb,
394 "vs-2120: add_save_link: insert_item returned %d",
395 retval);
396 } else {
397 if (truncate)
398 REISERFS_I(inode)->i_flags |=
399 i_link_saved_truncate_mask;
400 else
401 REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
402 }
403 }
404
405 /* this opens transaction unlike add_save_link */
406 int remove_save_link(struct inode *inode, int truncate)
407 {
408 struct reiserfs_transaction_handle th;
409 struct reiserfs_key key;
410 int err;
411
412 /* we are going to do one balancing only */
413 err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
414 if (err)
415 return err;
416
417 /* setup key of "save" link */
418 key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
419 key.k_objectid = INODE_PKEY(inode)->k_objectid;
420 if (!truncate) {
421 /* unlink, rmdir, rename */
422 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
423 1 + inode->i_sb->s_blocksize);
424 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
425 } else {
426 /* truncate */
427 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
428 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
429 }
430
431 if ((truncate &&
432 (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
433 (!truncate &&
434 (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
435 /* don't take quota bytes from anywhere */
436 reiserfs_delete_solid_item(&th, NULL, &key);
437 if (!truncate) {
438 reiserfs_release_objectid(&th, inode->i_ino);
439 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
440 } else
441 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
442
443 return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
444 }
445
446 static void reiserfs_kill_sb(struct super_block *s)
447 {
448 if (REISERFS_SB(s)) {
449 #ifdef CONFIG_REISERFS_FS_XATTR
450 if (REISERFS_SB(s)->xattr_root) {
451 d_invalidate(REISERFS_SB(s)->xattr_root);
452 dput(REISERFS_SB(s)->xattr_root);
453 REISERFS_SB(s)->xattr_root = NULL;
454 }
455 #endif
456 if (REISERFS_SB(s)->priv_root) {
457 d_invalidate(REISERFS_SB(s)->priv_root);
458 dput(REISERFS_SB(s)->priv_root);
459 REISERFS_SB(s)->priv_root = NULL;
460 }
461 }
462
463 kill_block_super(s);
464 }
465
466 static void reiserfs_put_super(struct super_block *s)
467 {
468 struct reiserfs_transaction_handle th;
469 th.t_trans_id = 0;
470
471 /* change file system state to current state if it was mounted with read-write permissions */
472 if (!(s->s_flags & MS_RDONLY)) {
473 if (!journal_begin(&th, s, 10)) {
474 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
475 1);
476 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
477 REISERFS_SB(s)->s_mount_state);
478 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
479 }
480 }
481
482 /* note, journal_release checks for readonly mount, and can decide not
483 ** to do a journal_end
484 */
485 journal_release(&th, s);
486
487 reiserfs_free_bitmap_cache(s);
488
489 brelse(SB_BUFFER_WITH_SB(s));
490
491 print_statistics(s);
492
493 if (REISERFS_SB(s)->reserved_blocks != 0) {
494 reiserfs_warning(s,
495 "green-2005: reiserfs_put_super: reserved blocks left %d",
496 REISERFS_SB(s)->reserved_blocks);
497 }
498
499 reiserfs_proc_info_done(s);
500
501 kfree(s->s_fs_info);
502 s->s_fs_info = NULL;
503
504 return;
505 }
506
507 static struct kmem_cache *reiserfs_inode_cachep;
508
509 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
510 {
511 struct reiserfs_inode_info *ei;
512 ei = (struct reiserfs_inode_info *)
513 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
514 if (!ei)
515 return NULL;
516 return &ei->vfs_inode;
517 }
518
519 static void reiserfs_destroy_inode(struct inode *inode)
520 {
521 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
522 }
523
524 static void init_once(void *foo)
525 {
526 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
527
528 INIT_LIST_HEAD(&ei->i_prealloc_list);
529 inode_init_once(&ei->vfs_inode);
530 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
531 ei->i_acl_access = NULL;
532 ei->i_acl_default = NULL;
533 #endif
534 }
535
536 static int init_inodecache(void)
537 {
538 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
539 sizeof(struct
540 reiserfs_inode_info),
541 0, (SLAB_RECLAIM_ACCOUNT|
542 SLAB_MEM_SPREAD),
543 init_once);
544 if (reiserfs_inode_cachep == NULL)
545 return -ENOMEM;
546 return 0;
547 }
548
549 static void destroy_inodecache(void)
550 {
551 kmem_cache_destroy(reiserfs_inode_cachep);
552 }
553
554 /* we don't mark inodes dirty, we just log them */
555 static void reiserfs_dirty_inode(struct inode *inode)
556 {
557 struct reiserfs_transaction_handle th;
558
559 int err = 0;
560 if (inode->i_sb->s_flags & MS_RDONLY) {
561 reiserfs_warning(inode->i_sb,
562 "clm-6006: writing inode %lu on readonly FS",
563 inode->i_ino);
564 return;
565 }
566 reiserfs_write_lock(inode->i_sb);
567
568 /* this is really only used for atime updates, so they don't have
569 ** to be included in O_SYNC or fsync
570 */
571 err = journal_begin(&th, inode->i_sb, 1);
572 if (err) {
573 reiserfs_write_unlock(inode->i_sb);
574 return;
575 }
576 reiserfs_update_sd(&th, inode);
577 journal_end(&th, inode->i_sb, 1);
578 reiserfs_write_unlock(inode->i_sb);
579 }
580
581 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584 struct posix_acl *acl;
585
586 acl = REISERFS_I(inode)->i_acl_access;
587 if (acl && !IS_ERR(acl))
588 posix_acl_release(acl);
589 REISERFS_I(inode)->i_acl_access = NULL;
590
591 acl = REISERFS_I(inode)->i_acl_default;
592 if (acl && !IS_ERR(acl))
593 posix_acl_release(acl);
594 REISERFS_I(inode)->i_acl_default = NULL;
595 }
596 #else
597 #define reiserfs_clear_inode NULL
598 #endif
599
600 #ifdef CONFIG_QUOTA
601 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
602 size_t, loff_t);
603 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
604 loff_t);
605 #endif
606
607 static const struct super_operations reiserfs_sops = {
608 .alloc_inode = reiserfs_alloc_inode,
609 .destroy_inode = reiserfs_destroy_inode,
610 .write_inode = reiserfs_write_inode,
611 .dirty_inode = reiserfs_dirty_inode,
612 .delete_inode = reiserfs_delete_inode,
613 .clear_inode = reiserfs_clear_inode,
614 .put_super = reiserfs_put_super,
615 .write_super = reiserfs_write_super,
616 .sync_fs = reiserfs_sync_fs,
617 .write_super_lockfs = reiserfs_write_super_lockfs,
618 .unlockfs = reiserfs_unlockfs,
619 .statfs = reiserfs_statfs,
620 .remount_fs = reiserfs_remount,
621 .show_options = generic_show_options,
622 #ifdef CONFIG_QUOTA
623 .quota_read = reiserfs_quota_read,
624 .quota_write = reiserfs_quota_write,
625 #endif
626 };
627
628 #ifdef CONFIG_QUOTA
629 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
630
631 static int reiserfs_dquot_initialize(struct inode *, int);
632 static int reiserfs_dquot_drop(struct inode *);
633 static int reiserfs_write_dquot(struct dquot *);
634 static int reiserfs_acquire_dquot(struct dquot *);
635 static int reiserfs_release_dquot(struct dquot *);
636 static int reiserfs_mark_dquot_dirty(struct dquot *);
637 static int reiserfs_write_info(struct super_block *, int);
638 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
639
640 static struct dquot_operations reiserfs_quota_operations = {
641 .initialize = reiserfs_dquot_initialize,
642 .drop = reiserfs_dquot_drop,
643 .alloc_space = dquot_alloc_space,
644 .alloc_inode = dquot_alloc_inode,
645 .free_space = dquot_free_space,
646 .free_inode = dquot_free_inode,
647 .transfer = dquot_transfer,
648 .write_dquot = reiserfs_write_dquot,
649 .acquire_dquot = reiserfs_acquire_dquot,
650 .release_dquot = reiserfs_release_dquot,
651 .mark_dirty = reiserfs_mark_dquot_dirty,
652 .write_info = reiserfs_write_info,
653 };
654
655 static struct quotactl_ops reiserfs_qctl_operations = {
656 .quota_on = reiserfs_quota_on,
657 .quota_off = vfs_quota_off,
658 .quota_sync = vfs_quota_sync,
659 .get_info = vfs_get_dqinfo,
660 .set_info = vfs_set_dqinfo,
661 .get_dqblk = vfs_get_dqblk,
662 .set_dqblk = vfs_set_dqblk,
663 };
664 #endif
665
666 static const struct export_operations reiserfs_export_ops = {
667 .encode_fh = reiserfs_encode_fh,
668 .fh_to_dentry = reiserfs_fh_to_dentry,
669 .fh_to_parent = reiserfs_fh_to_parent,
670 .get_parent = reiserfs_get_parent,
671 };
672
673 /* this struct is used in reiserfs_getopt () for containing the value for those
674 mount options that have values rather than being toggles. */
675 typedef struct {
676 char *value;
677 int setmask; /* bitmask which is to set on mount_options bitmask when this
678 value is found, 0 is no bits are to be changed. */
679 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
680 value is found, 0 is no bits are to be changed. This is
681 applied BEFORE setmask */
682 } arg_desc_t;
683
684 /* Set this bit in arg_required to allow empty arguments */
685 #define REISERFS_OPT_ALLOWEMPTY 31
686
687 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
688 mount options */
689 typedef struct {
690 char *option_name;
691 int arg_required; /* 0 if argument is not required, not 0 otherwise */
692 const arg_desc_t *values; /* list of values accepted by an option */
693 int setmask; /* bitmask which is to set on mount_options bitmask when this
694 value is found, 0 is no bits are to be changed. */
695 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
696 value is found, 0 is no bits are to be changed. This is
697 applied BEFORE setmask */
698 } opt_desc_t;
699
700 /* possible values for -o data= */
701 static const arg_desc_t logging_mode[] = {
702 {"ordered", 1 << REISERFS_DATA_ORDERED,
703 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
704 {"journal", 1 << REISERFS_DATA_LOG,
705 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
706 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
707 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
708 {.value = NULL}
709 };
710
711 /* possible values for -o barrier= */
712 static const arg_desc_t barrier_mode[] = {
713 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
714 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
715 {.value = NULL}
716 };
717
718 /* possible values for "-o block-allocator=" and bits which are to be set in
719 s_mount_opt of reiserfs specific part of in-core super block */
720 static const arg_desc_t balloc[] = {
721 {"noborder", 1 << REISERFS_NO_BORDER, 0},
722 {"border", 0, 1 << REISERFS_NO_BORDER},
723 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
724 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
725 {"test4", 1 << REISERFS_TEST4, 0},
726 {"notest4", 0, 1 << REISERFS_TEST4},
727 {NULL, 0, 0}
728 };
729
730 static const arg_desc_t tails[] = {
731 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
732 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
733 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
734 {NULL, 0, 0}
735 };
736
737 static const arg_desc_t error_actions[] = {
738 {"panic", 1 << REISERFS_ERROR_PANIC,
739 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
740 {"ro-remount", 1 << REISERFS_ERROR_RO,
741 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
742 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
743 {"continue", 1 << REISERFS_ERROR_CONTINUE,
744 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
745 #endif
746 {NULL, 0, 0},
747 };
748
749 /* proceed only one option from a list *cur - string containing of mount options
750 opts - array of options which are accepted
751 opt_arg - if option is found and requires an argument and if it is specifed
752 in the input - pointer to the argument is stored here
753 bit_flags - if option requires to set a certain bit - it is set here
754 return -1 if unknown option is found, opt->arg_required otherwise */
755 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
756 char **opt_arg, unsigned long *bit_flags)
757 {
758 char *p;
759 /* foo=bar,
760 ^ ^ ^
761 | | +-- option_end
762 | +-- arg_start
763 +-- option_start
764 */
765 const opt_desc_t *opt;
766 const arg_desc_t *arg;
767
768 p = *cur;
769
770 /* assume argument cannot contain commas */
771 *cur = strchr(p, ',');
772 if (*cur) {
773 *(*cur) = '\0';
774 (*cur)++;
775 }
776
777 if (!strncmp(p, "alloc=", 6)) {
778 /* Ugly special case, probably we should redo options parser so that
779 it can understand several arguments for some options, also so that
780 it can fill several bitfields with option values. */
781 if (reiserfs_parse_alloc_options(s, p + 6)) {
782 return -1;
783 } else {
784 return 0;
785 }
786 }
787
788 /* for every option in the list */
789 for (opt = opts; opt->option_name; opt++) {
790 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
791 if (bit_flags) {
792 if (opt->clrmask ==
793 (1 << REISERFS_UNSUPPORTED_OPT))
794 reiserfs_warning(s, "%s not supported.",
795 p);
796 else
797 *bit_flags &= ~opt->clrmask;
798 if (opt->setmask ==
799 (1 << REISERFS_UNSUPPORTED_OPT))
800 reiserfs_warning(s, "%s not supported.",
801 p);
802 else
803 *bit_flags |= opt->setmask;
804 }
805 break;
806 }
807 }
808 if (!opt->option_name) {
809 reiserfs_warning(s, "unknown mount option \"%s\"", p);
810 return -1;
811 }
812
813 p += strlen(opt->option_name);
814 switch (*p) {
815 case '=':
816 if (!opt->arg_required) {
817 reiserfs_warning(s,
818 "the option \"%s\" does not require an argument",
819 opt->option_name);
820 return -1;
821 }
822 break;
823
824 case 0:
825 if (opt->arg_required) {
826 reiserfs_warning(s,
827 "the option \"%s\" requires an argument",
828 opt->option_name);
829 return -1;
830 }
831 break;
832 default:
833 reiserfs_warning(s, "head of option \"%s\" is only correct",
834 opt->option_name);
835 return -1;
836 }
837
838 /* move to the argument, or to next option if argument is not required */
839 p++;
840
841 if (opt->arg_required
842 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
843 && !strlen(p)) {
844 /* this catches "option=," if not allowed */
845 reiserfs_warning(s, "empty argument for \"%s\"",
846 opt->option_name);
847 return -1;
848 }
849
850 if (!opt->values) {
851 /* *=NULLopt_arg contains pointer to argument */
852 *opt_arg = p;
853 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
854 }
855
856 /* values possible for this option are listed in opt->values */
857 for (arg = opt->values; arg->value; arg++) {
858 if (!strcmp(p, arg->value)) {
859 if (bit_flags) {
860 *bit_flags &= ~arg->clrmask;
861 *bit_flags |= arg->setmask;
862 }
863 return opt->arg_required;
864 }
865 }
866
867 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
868 opt->option_name);
869 return -1;
870 }
871
872 /* returns 0 if something is wrong in option string, 1 - otherwise */
873 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
874 unsigned long *mount_options,
875 /* after the parsing phase, contains the
876 collection of bitflags defining what
877 mount options were selected. */
878 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
879 char **jdev_name,
880 unsigned int *commit_max_age,
881 char **qf_names,
882 unsigned int *qfmt)
883 {
884 int c;
885 char *arg = NULL;
886 char *pos;
887 opt_desc_t opts[] = {
888 /* Compatibility stuff, so that -o notail for old setups still work */
889 {"tails",.arg_required = 't',.values = tails},
890 {"notail",.clrmask =
891 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
892 {"conv",.setmask = 1 << REISERFS_CONVERT},
893 {"attrs",.setmask = 1 << REISERFS_ATTRS},
894 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
895 #ifdef CONFIG_REISERFS_FS_XATTR
896 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
897 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
898 #else
899 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
900 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
901 #endif
902 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
903 {"acl",.setmask = 1 << REISERFS_POSIXACL},
904 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
905 #else
906 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
907 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 #endif
909 {.option_name = "nolog"},
910 {"replayonly",.setmask = 1 << REPLAYONLY},
911 {"block-allocator",.arg_required = 'a',.values = balloc},
912 {"data",.arg_required = 'd',.values = logging_mode},
913 {"barrier",.arg_required = 'b',.values = barrier_mode},
914 {"resize",.arg_required = 'r',.values = NULL},
915 {"jdev",.arg_required = 'j',.values = NULL},
916 {"nolargeio",.arg_required = 'w',.values = NULL},
917 {"commit",.arg_required = 'c',.values = NULL},
918 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
919 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
920 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
921 {"errors",.arg_required = 'e',.values = error_actions},
922 {"usrjquota",.arg_required =
923 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
924 {"grpjquota",.arg_required =
925 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
926 {"jqfmt",.arg_required = 'f',.values = NULL},
927 {.option_name = NULL}
928 };
929
930 *blocks = 0;
931 if (!options || !*options)
932 /* use default configuration: create tails, journaling on, no
933 conversion to newest format */
934 return 1;
935
936 for (pos = options; pos;) {
937 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
938 if (c == -1)
939 /* wrong option is given */
940 return 0;
941
942 if (c == 'r') {
943 char *p;
944
945 p = NULL;
946 /* "resize=NNN" or "resize=auto" */
947
948 if (!strcmp(arg, "auto")) {
949 /* From JFS code, to auto-get the size. */
950 *blocks =
951 s->s_bdev->bd_inode->i_size >> s->
952 s_blocksize_bits;
953 } else {
954 *blocks = simple_strtoul(arg, &p, 0);
955 if (*p != '\0') {
956 /* NNN does not look like a number */
957 reiserfs_warning(s,
958 "reiserfs_parse_options: bad value %s",
959 arg);
960 return 0;
961 }
962 }
963 }
964
965 if (c == 'c') {
966 char *p = NULL;
967 unsigned long val = simple_strtoul(arg, &p, 0);
968 /* commit=NNN (time in seconds) */
969 if (*p != '\0' || val >= (unsigned int)-1) {
970 reiserfs_warning(s,
971 "reiserfs_parse_options: bad value %s",
972 arg);
973 return 0;
974 }
975 *commit_max_age = (unsigned int)val;
976 }
977
978 if (c == 'w') {
979 reiserfs_warning(s, "reiserfs: nolargeio option is no longer supported");
980 return 0;
981 }
982
983 if (c == 'j') {
984 if (arg && *arg && jdev_name) {
985 if (*jdev_name) { //Hm, already assigned?
986 reiserfs_warning(s,
987 "reiserfs_parse_options: journal device was already specified to be %s",
988 *jdev_name);
989 return 0;
990 }
991 *jdev_name = arg;
992 }
993 }
994 #ifdef CONFIG_QUOTA
995 if (c == 'u' || c == 'g') {
996 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
997
998 if ((sb_any_quota_enabled(s) ||
999 sb_any_quota_suspended(s)) &&
1000 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1001 reiserfs_warning(s,
1002 "reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
1003 return 0;
1004 }
1005 if (*arg) { /* Some filename specified? */
1006 if (REISERFS_SB(s)->s_qf_names[qtype]
1007 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1008 arg)) {
1009 reiserfs_warning(s,
1010 "reiserfs_parse_options: %s quota file already specified.",
1011 QTYPE2NAME(qtype));
1012 return 0;
1013 }
1014 if (strchr(arg, '/')) {
1015 reiserfs_warning(s,
1016 "reiserfs_parse_options: quotafile must be on filesystem root.");
1017 return 0;
1018 }
1019 qf_names[qtype] =
1020 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1021 if (!qf_names[qtype]) {
1022 reiserfs_warning(s,
1023 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1024 return 0;
1025 }
1026 strcpy(qf_names[qtype], arg);
1027 *mount_options |= 1 << REISERFS_QUOTA;
1028 } else {
1029 if (qf_names[qtype] !=
1030 REISERFS_SB(s)->s_qf_names[qtype])
1031 kfree(qf_names[qtype]);
1032 qf_names[qtype] = NULL;
1033 }
1034 }
1035 if (c == 'f') {
1036 if (!strcmp(arg, "vfsold"))
1037 *qfmt = QFMT_VFS_OLD;
1038 else if (!strcmp(arg, "vfsv0"))
1039 *qfmt = QFMT_VFS_V0;
1040 else {
1041 reiserfs_warning(s,
1042 "reiserfs_parse_options: unknown quota format specified.");
1043 return 0;
1044 }
1045 if ((sb_any_quota_enabled(s) ||
1046 sb_any_quota_suspended(s)) &&
1047 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1048 reiserfs_warning(s,
1049 "reiserfs_parse_options: cannot change journaled quota options when quota turned on.");
1050 return 0;
1051 }
1052 }
1053 #else
1054 if (c == 'u' || c == 'g' || c == 'f') {
1055 reiserfs_warning(s,
1056 "reiserfs_parse_options: journaled quota options not supported.");
1057 return 0;
1058 }
1059 #endif
1060 }
1061
1062 #ifdef CONFIG_QUOTA
1063 if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1064 && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1065 reiserfs_warning(s,
1066 "reiserfs_parse_options: journaled quota format not specified.");
1067 return 0;
1068 }
1069 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1070 if (!(*mount_options & (1 << REISERFS_QUOTA))
1071 && sb_any_quota_enabled(s)) {
1072 reiserfs_warning(s,
1073 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1074 return 0;
1075 }
1076 #endif
1077
1078 return 1;
1079 }
1080
1081 static void switch_data_mode(struct super_block *s, unsigned long mode)
1082 {
1083 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1084 (1 << REISERFS_DATA_ORDERED) |
1085 (1 << REISERFS_DATA_WRITEBACK));
1086 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1087 }
1088
1089 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1090 {
1091 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1092 if (!reiserfs_data_log(s)) {
1093 switch_data_mode(s, REISERFS_DATA_LOG);
1094 reiserfs_info(s, "switching to journaled data mode\n");
1095 }
1096 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1097 if (!reiserfs_data_ordered(s)) {
1098 switch_data_mode(s, REISERFS_DATA_ORDERED);
1099 reiserfs_info(s, "switching to ordered data mode\n");
1100 }
1101 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1102 if (!reiserfs_data_writeback(s)) {
1103 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1104 reiserfs_info(s, "switching to writeback data mode\n");
1105 }
1106 }
1107 }
1108
1109 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1110 {
1111 int flush = (1 << REISERFS_BARRIER_FLUSH);
1112 int none = (1 << REISERFS_BARRIER_NONE);
1113 int all_barrier = flush | none;
1114
1115 if (bits & all_barrier) {
1116 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1117 if (bits & flush) {
1118 REISERFS_SB(s)->s_mount_opt |= flush;
1119 printk("reiserfs: enabling write barrier flush mode\n");
1120 } else if (bits & none) {
1121 REISERFS_SB(s)->s_mount_opt |= none;
1122 printk("reiserfs: write barriers turned off\n");
1123 }
1124 }
1125 }
1126
1127 static void handle_attrs(struct super_block *s)
1128 {
1129 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1130
1131 if (reiserfs_attrs(s)) {
1132 if (old_format_only(s)) {
1133 reiserfs_warning(s,
1134 "reiserfs: cannot support attributes on 3.5.x disk format");
1135 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1136 return;
1137 }
1138 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1139 reiserfs_warning(s,
1140 "reiserfs: cannot support attributes until flag is set in super-block");
1141 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1142 }
1143 }
1144 }
1145
1146 #ifdef CONFIG_QUOTA
1147 static void handle_quota_files(struct super_block *s, char **qf_names,
1148 unsigned int *qfmt)
1149 {
1150 int i;
1151
1152 for (i = 0; i < MAXQUOTAS; i++) {
1153 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1154 kfree(REISERFS_SB(s)->s_qf_names[i]);
1155 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1156 }
1157 REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1158 }
1159 #endif
1160
1161 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1162 {
1163 struct reiserfs_super_block *rs;
1164 struct reiserfs_transaction_handle th;
1165 unsigned long blocks;
1166 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1167 unsigned long safe_mask = 0;
1168 unsigned int commit_max_age = (unsigned int)-1;
1169 struct reiserfs_journal *journal = SB_JOURNAL(s);
1170 char *new_opts = kstrdup(arg, GFP_KERNEL);
1171 int err;
1172 char *qf_names[MAXQUOTAS];
1173 unsigned int qfmt = 0;
1174 #ifdef CONFIG_QUOTA
1175 int i;
1176
1177 memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1178 #endif
1179
1180 rs = SB_DISK_SUPER_BLOCK(s);
1181
1182 if (!reiserfs_parse_options
1183 (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1184 qf_names, &qfmt)) {
1185 #ifdef CONFIG_QUOTA
1186 for (i = 0; i < MAXQUOTAS; i++)
1187 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1188 kfree(qf_names[i]);
1189 #endif
1190 err = -EINVAL;
1191 goto out_err;
1192 }
1193 #ifdef CONFIG_QUOTA
1194 handle_quota_files(s, qf_names, &qfmt);
1195 #endif
1196
1197 handle_attrs(s);
1198
1199 /* Add options that are safe here */
1200 safe_mask |= 1 << REISERFS_SMALLTAIL;
1201 safe_mask |= 1 << REISERFS_LARGETAIL;
1202 safe_mask |= 1 << REISERFS_NO_BORDER;
1203 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1204 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1205 safe_mask |= 1 << REISERFS_TEST4;
1206 safe_mask |= 1 << REISERFS_ATTRS;
1207 safe_mask |= 1 << REISERFS_XATTRS_USER;
1208 safe_mask |= 1 << REISERFS_POSIXACL;
1209 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1210 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1211 safe_mask |= 1 << REISERFS_ERROR_RO;
1212 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1213 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1214 safe_mask |= 1 << REISERFS_QUOTA;
1215
1216 /* Update the bitmask, taking care to keep
1217 * the bits we're not allowed to change here */
1218 REISERFS_SB(s)->s_mount_opt =
1219 (REISERFS_SB(s)->
1220 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1221
1222 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1223 journal->j_max_commit_age = commit_max_age;
1224 journal->j_max_trans_age = commit_max_age;
1225 } else if (commit_max_age == 0) {
1226 /* 0 means restore defaults. */
1227 journal->j_max_commit_age = journal->j_default_max_commit_age;
1228 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1229 }
1230
1231 if (blocks) {
1232 err = reiserfs_resize(s, blocks);
1233 if (err != 0)
1234 goto out_err;
1235 }
1236
1237 if (*mount_flags & MS_RDONLY) {
1238 reiserfs_xattr_init(s, *mount_flags);
1239 /* remount read-only */
1240 if (s->s_flags & MS_RDONLY)
1241 /* it is read-only already */
1242 goto out_ok;
1243 /* try to remount file system with read-only permissions */
1244 if (sb_umount_state(rs) == REISERFS_VALID_FS
1245 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1246 goto out_ok;
1247 }
1248
1249 err = journal_begin(&th, s, 10);
1250 if (err)
1251 goto out_err;
1252
1253 /* Mounting a rw partition read-only. */
1254 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1255 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1256 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1257 } else {
1258 /* remount read-write */
1259 if (!(s->s_flags & MS_RDONLY)) {
1260 reiserfs_xattr_init(s, *mount_flags);
1261 goto out_ok; /* We are read-write already */
1262 }
1263
1264 if (reiserfs_is_journal_aborted(journal)) {
1265 err = journal->j_errno;
1266 goto out_err;
1267 }
1268
1269 handle_data_mode(s, mount_options);
1270 handle_barrier_mode(s, mount_options);
1271 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1272 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1273 err = journal_begin(&th, s, 10);
1274 if (err)
1275 goto out_err;
1276
1277 /* Mount a partition which is read-only, read-write */
1278 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1279 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1280 s->s_flags &= ~MS_RDONLY;
1281 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1282 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1283 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1284 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1285 }
1286 /* this will force a full flush of all journal lists */
1287 SB_JOURNAL(s)->j_must_wait = 1;
1288 err = journal_end(&th, s, 10);
1289 if (err)
1290 goto out_err;
1291 s->s_dirt = 0;
1292
1293 if (!(*mount_flags & MS_RDONLY)) {
1294 finish_unfinished(s);
1295 reiserfs_xattr_init(s, *mount_flags);
1296 }
1297
1298 out_ok:
1299 kfree(s->s_options);
1300 s->s_options = new_opts;
1301 return 0;
1302
1303 out_err:
1304 kfree(new_opts);
1305 return err;
1306 }
1307
1308 static int read_super_block(struct super_block *s, int offset)
1309 {
1310 struct buffer_head *bh;
1311 struct reiserfs_super_block *rs;
1312 int fs_blocksize;
1313
1314 bh = sb_bread(s, offset / s->s_blocksize);
1315 if (!bh) {
1316 reiserfs_warning(s, "sh-2006: read_super_block: "
1317 "bread failed (dev %s, block %lu, size %lu)",
1318 reiserfs_bdevname(s), offset / s->s_blocksize,
1319 s->s_blocksize);
1320 return 1;
1321 }
1322
1323 rs = (struct reiserfs_super_block *)bh->b_data;
1324 if (!is_any_reiserfs_magic_string(rs)) {
1325 brelse(bh);
1326 return 1;
1327 }
1328 //
1329 // ok, reiserfs signature (old or new) found in at the given offset
1330 //
1331 fs_blocksize = sb_blocksize(rs);
1332 brelse(bh);
1333 sb_set_blocksize(s, fs_blocksize);
1334
1335 bh = sb_bread(s, offset / s->s_blocksize);
1336 if (!bh) {
1337 reiserfs_warning(s, "sh-2007: read_super_block: "
1338 "bread failed (dev %s, block %lu, size %lu)\n",
1339 reiserfs_bdevname(s), offset / s->s_blocksize,
1340 s->s_blocksize);
1341 return 1;
1342 }
1343
1344 rs = (struct reiserfs_super_block *)bh->b_data;
1345 if (sb_blocksize(rs) != s->s_blocksize) {
1346 reiserfs_warning(s, "sh-2011: read_super_block: "
1347 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1348 reiserfs_bdevname(s),
1349 (unsigned long long)bh->b_blocknr,
1350 s->s_blocksize);
1351 brelse(bh);
1352 return 1;
1353 }
1354
1355 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1356 brelse(bh);
1357 reiserfs_warning(s,
1358 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1359 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1360 "get newer reiserfsprogs package");
1361 return 1;
1362 }
1363
1364 SB_BUFFER_WITH_SB(s) = bh;
1365 SB_DISK_SUPER_BLOCK(s) = rs;
1366
1367 if (is_reiserfs_jr(rs)) {
1368 /* magic is of non-standard journal filesystem, look at s_version to
1369 find which format is in use */
1370 if (sb_version(rs) == REISERFS_VERSION_2)
1371 reiserfs_warning(s,
1372 "read_super_block: found reiserfs format \"3.6\""
1373 " with non-standard journal");
1374 else if (sb_version(rs) == REISERFS_VERSION_1)
1375 reiserfs_warning(s,
1376 "read_super_block: found reiserfs format \"3.5\""
1377 " with non-standard journal");
1378 else {
1379 reiserfs_warning(s,
1380 "sh-2012: read_super_block: found unknown "
1381 "format \"%u\" of reiserfs with non-standard magic",
1382 sb_version(rs));
1383 return 1;
1384 }
1385 } else
1386 /* s_version of standard format may contain incorrect information,
1387 so we just look at the magic string */
1388 reiserfs_info(s,
1389 "found reiserfs format \"%s\" with standard journal\n",
1390 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1391
1392 s->s_op = &reiserfs_sops;
1393 s->s_export_op = &reiserfs_export_ops;
1394 #ifdef CONFIG_QUOTA
1395 s->s_qcop = &reiserfs_qctl_operations;
1396 s->dq_op = &reiserfs_quota_operations;
1397 #endif
1398
1399 /* new format is limited by the 32 bit wide i_blocks field, want to
1400 ** be one full block below that.
1401 */
1402 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1403 return 0;
1404 }
1405
1406 /* after journal replay, reread all bitmap and super blocks */
1407 static int reread_meta_blocks(struct super_block *s)
1408 {
1409 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1410 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1411 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1412 reiserfs_warning(s,
1413 "reread_meta_blocks, error reading the super");
1414 return 1;
1415 }
1416
1417 return 0;
1418 }
1419
1420 /////////////////////////////////////////////////////
1421 // hash detection stuff
1422
1423 // if root directory is empty - we set default - Yura's - hash and
1424 // warn about it
1425 // FIXME: we look for only one name in a directory. If tea and yura
1426 // bith have the same value - we ask user to send report to the
1427 // mailing list
1428 static __u32 find_hash_out(struct super_block *s)
1429 {
1430 int retval;
1431 struct inode *inode;
1432 struct cpu_key key;
1433 INITIALIZE_PATH(path);
1434 struct reiserfs_dir_entry de;
1435 __u32 hash = DEFAULT_HASH;
1436
1437 inode = s->s_root->d_inode;
1438
1439 do { // Some serious "goto"-hater was there ;)
1440 u32 teahash, r5hash, yurahash;
1441
1442 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1443 retval = search_by_entry_key(s, &key, &path, &de);
1444 if (retval == IO_ERROR) {
1445 pathrelse(&path);
1446 return UNSET_HASH;
1447 }
1448 if (retval == NAME_NOT_FOUND)
1449 de.de_entry_num--;
1450 set_de_name_and_namelen(&de);
1451 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1452 /* allow override in this case */
1453 if (reiserfs_rupasov_hash(s)) {
1454 hash = YURA_HASH;
1455 }
1456 reiserfs_warning(s, "FS seems to be empty, autodetect "
1457 "is using the default hash");
1458 break;
1459 }
1460 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1461 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1462 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1463 if (((teahash == r5hash)
1464 &&
1465 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1466 == r5hash)) || ((teahash == yurahash)
1467 && (yurahash ==
1468 GET_HASH_VALUE(deh_offset
1469 (&
1470 (de.
1471 de_deh[de.
1472 de_entry_num])))))
1473 || ((r5hash == yurahash)
1474 && (yurahash ==
1475 GET_HASH_VALUE(deh_offset
1476 (&(de.de_deh[de.de_entry_num])))))) {
1477 reiserfs_warning(s,
1478 "Unable to automatically detect hash function. "
1479 "Please mount with -o hash={tea,rupasov,r5}",
1480 reiserfs_bdevname(s));
1481 hash = UNSET_HASH;
1482 break;
1483 }
1484 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1485 yurahash)
1486 hash = YURA_HASH;
1487 else if (GET_HASH_VALUE
1488 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1489 hash = TEA_HASH;
1490 else if (GET_HASH_VALUE
1491 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1492 hash = R5_HASH;
1493 else {
1494 reiserfs_warning(s, "Unrecognised hash function");
1495 hash = UNSET_HASH;
1496 }
1497 } while (0);
1498
1499 pathrelse(&path);
1500 return hash;
1501 }
1502
1503 // finds out which hash names are sorted with
1504 static int what_hash(struct super_block *s)
1505 {
1506 __u32 code;
1507
1508 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1509
1510 /* reiserfs_hash_detect() == true if any of the hash mount options
1511 ** were used. We must check them to make sure the user isn't
1512 ** using a bad hash value
1513 */
1514 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1515 code = find_hash_out(s);
1516
1517 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1518 /* detection has found the hash, and we must check against the
1519 ** mount options
1520 */
1521 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1522 reiserfs_warning(s, "Error, %s hash detected, "
1523 "unable to force rupasov hash",
1524 reiserfs_hashname(code));
1525 code = UNSET_HASH;
1526 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1527 reiserfs_warning(s, "Error, %s hash detected, "
1528 "unable to force tea hash",
1529 reiserfs_hashname(code));
1530 code = UNSET_HASH;
1531 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1532 reiserfs_warning(s, "Error, %s hash detected, "
1533 "unable to force r5 hash",
1534 reiserfs_hashname(code));
1535 code = UNSET_HASH;
1536 }
1537 } else {
1538 /* find_hash_out was not called or could not determine the hash */
1539 if (reiserfs_rupasov_hash(s)) {
1540 code = YURA_HASH;
1541 } else if (reiserfs_tea_hash(s)) {
1542 code = TEA_HASH;
1543 } else if (reiserfs_r5_hash(s)) {
1544 code = R5_HASH;
1545 }
1546 }
1547
1548 /* if we are mounted RW, and we have a new valid hash code, update
1549 ** the super
1550 */
1551 if (code != UNSET_HASH &&
1552 !(s->s_flags & MS_RDONLY) &&
1553 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1554 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1555 }
1556 return code;
1557 }
1558
1559 // return pointer to appropriate function
1560 static hashf_t hash_function(struct super_block *s)
1561 {
1562 switch (what_hash(s)) {
1563 case TEA_HASH:
1564 reiserfs_info(s, "Using tea hash to sort names\n");
1565 return keyed_hash;
1566 case YURA_HASH:
1567 reiserfs_info(s, "Using rupasov hash to sort names\n");
1568 return yura_hash;
1569 case R5_HASH:
1570 reiserfs_info(s, "Using r5 hash to sort names\n");
1571 return r5_hash;
1572 }
1573 return NULL;
1574 }
1575
1576 // this is used to set up correct value for old partitions
1577 static int function2code(hashf_t func)
1578 {
1579 if (func == keyed_hash)
1580 return TEA_HASH;
1581 if (func == yura_hash)
1582 return YURA_HASH;
1583 if (func == r5_hash)
1584 return R5_HASH;
1585
1586 BUG(); // should never happen
1587
1588 return 0;
1589 }
1590
1591 #define SWARN(silent, s, ...) \
1592 if (!(silent)) \
1593 reiserfs_warning (s, __VA_ARGS__)
1594
1595 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1596 {
1597 struct inode *root_inode;
1598 struct reiserfs_transaction_handle th;
1599 int old_format = 0;
1600 unsigned long blocks;
1601 unsigned int commit_max_age = 0;
1602 int jinit_done = 0;
1603 struct reiserfs_iget_args args;
1604 struct reiserfs_super_block *rs;
1605 char *jdev_name;
1606 struct reiserfs_sb_info *sbi;
1607 int errval = -EINVAL;
1608 char *qf_names[MAXQUOTAS] = {};
1609 unsigned int qfmt = 0;
1610
1611 save_mount_options(s, data);
1612
1613 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1614 if (!sbi) {
1615 errval = -ENOMEM;
1616 goto error;
1617 }
1618 s->s_fs_info = sbi;
1619 /* Set default values for options: non-aggressive tails, RO on errors */
1620 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1621 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1622 /* no preallocation minimum, be smart in
1623 reiserfs_file_write instead */
1624 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1625 /* Preallocate by 16 blocks (17-1) at once */
1626 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1627 #ifdef CONFIG_REISERFS_FS_XATTR
1628 /* Initialize the rwsem for xattr dir */
1629 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1630 #endif
1631 /* setup default block allocator options */
1632 reiserfs_init_alloc_options(s);
1633
1634 jdev_name = NULL;
1635 if (reiserfs_parse_options
1636 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1637 &commit_max_age, qf_names, &qfmt) == 0) {
1638 goto error;
1639 }
1640 #ifdef CONFIG_QUOTA
1641 handle_quota_files(s, qf_names, &qfmt);
1642 #endif
1643
1644 if (blocks) {
1645 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1646 "for remount only");
1647 goto error;
1648 }
1649
1650 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1651 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1652 old_format = 1;
1653 /* try new format (64-th 1k block), which can contain reiserfs super block */
1654 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1655 SWARN(silent, s,
1656 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1657 reiserfs_bdevname(s));
1658 goto error;
1659 }
1660
1661 rs = SB_DISK_SUPER_BLOCK(s);
1662 /* Let's do basic sanity check to verify that underlying device is not
1663 smaller than the filesystem. If the check fails then abort and scream,
1664 because bad stuff will happen otherwise. */
1665 if (s->s_bdev && s->s_bdev->bd_inode
1666 && i_size_read(s->s_bdev->bd_inode) <
1667 sb_block_count(rs) * sb_blocksize(rs)) {
1668 SWARN(silent, s,
1669 "Filesystem on %s cannot be mounted because it is bigger than the device",
1670 reiserfs_bdevname(s));
1671 SWARN(silent, s,
1672 "You may need to run fsck or increase size of your LVM partition");
1673 SWARN(silent, s,
1674 "Or may be you forgot to reboot after fdisk when it told you to");
1675 goto error;
1676 }
1677
1678 sbi->s_mount_state = SB_REISERFS_STATE(s);
1679 sbi->s_mount_state = REISERFS_VALID_FS;
1680
1681 if ((errval = reiserfs_init_bitmap_cache(s))) {
1682 SWARN(silent, s,
1683 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1684 goto error;
1685 }
1686 errval = -EINVAL;
1687 #ifdef CONFIG_REISERFS_CHECK
1688 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1689 SWARN(silent, s, "- it is slow mode for debugging.");
1690 #endif
1691
1692 /* make data=ordered the default */
1693 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1694 !reiserfs_data_writeback(s)) {
1695 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1696 }
1697
1698 if (reiserfs_data_log(s)) {
1699 reiserfs_info(s, "using journaled data mode\n");
1700 } else if (reiserfs_data_ordered(s)) {
1701 reiserfs_info(s, "using ordered data mode\n");
1702 } else {
1703 reiserfs_info(s, "using writeback data mode\n");
1704 }
1705 if (reiserfs_barrier_flush(s)) {
1706 printk("reiserfs: using flush barriers\n");
1707 }
1708 // set_device_ro(s->s_dev, 1) ;
1709 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1710 SWARN(silent, s,
1711 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1712 goto error;
1713 } else {
1714 jinit_done = 1; /* once this is set, journal_release must be called
1715 ** if we error out of the mount
1716 */
1717 }
1718 if (reread_meta_blocks(s)) {
1719 SWARN(silent, s,
1720 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1721 goto error;
1722 }
1723
1724 if (replay_only(s))
1725 goto error;
1726
1727 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1728 SWARN(silent, s,
1729 "clm-7000: Detected readonly device, marking FS readonly");
1730 s->s_flags |= MS_RDONLY;
1731 }
1732 args.objectid = REISERFS_ROOT_OBJECTID;
1733 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1734 root_inode =
1735 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1736 reiserfs_init_locked_inode, (void *)(&args));
1737 if (!root_inode) {
1738 SWARN(silent, s,
1739 "jmacd-10: reiserfs_fill_super: get root inode failed");
1740 goto error;
1741 }
1742
1743 if (root_inode->i_state & I_NEW) {
1744 reiserfs_read_locked_inode(root_inode, &args);
1745 unlock_new_inode(root_inode);
1746 }
1747
1748 s->s_root = d_alloc_root(root_inode);
1749 if (!s->s_root) {
1750 iput(root_inode);
1751 goto error;
1752 }
1753 // define and initialize hash function
1754 sbi->s_hash_function = hash_function(s);
1755 if (sbi->s_hash_function == NULL) {
1756 dput(s->s_root);
1757 s->s_root = NULL;
1758 goto error;
1759 }
1760
1761 if (is_reiserfs_3_5(rs)
1762 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1763 set_bit(REISERFS_3_5, &(sbi->s_properties));
1764 else if (old_format)
1765 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1766 else
1767 set_bit(REISERFS_3_6, &(sbi->s_properties));
1768
1769 if (!(s->s_flags & MS_RDONLY)) {
1770
1771 errval = journal_begin(&th, s, 1);
1772 if (errval) {
1773 dput(s->s_root);
1774 s->s_root = NULL;
1775 goto error;
1776 }
1777 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1778
1779 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1780 set_sb_fs_state(rs, 0);
1781
1782 /* Clear out s_bmap_nr if it would wrap. We can handle this
1783 * case, but older revisions can't. This will cause the
1784 * file system to fail mount on those older implementations,
1785 * avoiding corruption. -jeffm */
1786 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1787 sb_bmap_nr(rs) != 0) {
1788 reiserfs_warning(s, "super-2030: This file system "
1789 "claims to use %u bitmap blocks in "
1790 "its super block, but requires %u. "
1791 "Clearing to zero.", sb_bmap_nr(rs),
1792 reiserfs_bmap_count(s));
1793
1794 set_sb_bmap_nr(rs, 0);
1795 }
1796
1797 if (old_format_only(s)) {
1798 /* filesystem of format 3.5 either with standard or non-standard
1799 journal */
1800 if (convert_reiserfs(s)) {
1801 /* and -o conv is given */
1802 if (!silent)
1803 reiserfs_info(s,
1804 "converting 3.5 filesystem to the 3.6 format");
1805
1806 if (is_reiserfs_3_5(rs))
1807 /* put magic string of 3.6 format. 2.2 will not be able to
1808 mount this filesystem anymore */
1809 memcpy(rs->s_v1.s_magic,
1810 reiserfs_3_6_magic_string,
1811 sizeof
1812 (reiserfs_3_6_magic_string));
1813
1814 set_sb_version(rs, REISERFS_VERSION_2);
1815 reiserfs_convert_objectid_map_v1(s);
1816 set_bit(REISERFS_3_6, &(sbi->s_properties));
1817 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1818 } else if (!silent) {
1819 reiserfs_info(s, "using 3.5.x disk format\n");
1820 }
1821 }
1822
1823 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1824 errval = journal_end(&th, s, 1);
1825 if (errval) {
1826 dput(s->s_root);
1827 s->s_root = NULL;
1828 goto error;
1829 }
1830
1831 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1832 dput(s->s_root);
1833 s->s_root = NULL;
1834 goto error;
1835 }
1836
1837 /* look for files which were to be removed in previous session */
1838 finish_unfinished(s);
1839 } else {
1840 if (old_format_only(s) && !silent) {
1841 reiserfs_info(s, "using 3.5.x disk format\n");
1842 }
1843
1844 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1845 dput(s->s_root);
1846 s->s_root = NULL;
1847 goto error;
1848 }
1849 }
1850 // mark hash in super block: it could be unset. overwrite should be ok
1851 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1852
1853 handle_attrs(s);
1854
1855 reiserfs_proc_info_init(s);
1856
1857 init_waitqueue_head(&(sbi->s_wait));
1858 spin_lock_init(&sbi->bitmap_lock);
1859
1860 return (0);
1861
1862 error:
1863 if (jinit_done) { /* kill the commit thread, free journal ram */
1864 journal_release_error(NULL, s);
1865 }
1866
1867 reiserfs_free_bitmap_cache(s);
1868 if (SB_BUFFER_WITH_SB(s))
1869 brelse(SB_BUFFER_WITH_SB(s));
1870 #ifdef CONFIG_QUOTA
1871 {
1872 int j;
1873 for (j = 0; j < MAXQUOTAS; j++)
1874 kfree(qf_names[j]);
1875 }
1876 #endif
1877 kfree(sbi);
1878
1879 s->s_fs_info = NULL;
1880 return errval;
1881 }
1882
1883 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1884 {
1885 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1886
1887 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1888 buf->f_bfree = sb_free_blocks(rs);
1889 buf->f_bavail = buf->f_bfree;
1890 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1891 buf->f_bsize = dentry->d_sb->s_blocksize;
1892 /* changed to accommodate gcc folks. */
1893 buf->f_type = REISERFS_SUPER_MAGIC;
1894 return 0;
1895 }
1896
1897 #ifdef CONFIG_QUOTA
1898 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1899 {
1900 struct reiserfs_transaction_handle th;
1901 int ret, err;
1902
1903 /* We may create quota structure so we need to reserve enough blocks */
1904 reiserfs_write_lock(inode->i_sb);
1905 ret =
1906 journal_begin(&th, inode->i_sb,
1907 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1908 if (ret)
1909 goto out;
1910 ret = dquot_initialize(inode, type);
1911 err =
1912 journal_end(&th, inode->i_sb,
1913 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1914 if (!ret && err)
1915 ret = err;
1916 out:
1917 reiserfs_write_unlock(inode->i_sb);
1918 return ret;
1919 }
1920
1921 static int reiserfs_dquot_drop(struct inode *inode)
1922 {
1923 struct reiserfs_transaction_handle th;
1924 int ret, err;
1925
1926 /* We may delete quota structure so we need to reserve enough blocks */
1927 reiserfs_write_lock(inode->i_sb);
1928 ret =
1929 journal_begin(&th, inode->i_sb,
1930 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1931 if (ret) {
1932 /*
1933 * We call dquot_drop() anyway to at least release references
1934 * to quota structures so that umount does not hang.
1935 */
1936 dquot_drop(inode);
1937 goto out;
1938 }
1939 ret = dquot_drop(inode);
1940 err =
1941 journal_end(&th, inode->i_sb,
1942 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1943 if (!ret && err)
1944 ret = err;
1945 out:
1946 reiserfs_write_unlock(inode->i_sb);
1947 return ret;
1948 }
1949
1950 static int reiserfs_write_dquot(struct dquot *dquot)
1951 {
1952 struct reiserfs_transaction_handle th;
1953 int ret, err;
1954
1955 reiserfs_write_lock(dquot->dq_sb);
1956 ret =
1957 journal_begin(&th, dquot->dq_sb,
1958 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1959 if (ret)
1960 goto out;
1961 ret = dquot_commit(dquot);
1962 err =
1963 journal_end(&th, dquot->dq_sb,
1964 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1965 if (!ret && err)
1966 ret = err;
1967 out:
1968 reiserfs_write_unlock(dquot->dq_sb);
1969 return ret;
1970 }
1971
1972 static int reiserfs_acquire_dquot(struct dquot *dquot)
1973 {
1974 struct reiserfs_transaction_handle th;
1975 int ret, err;
1976
1977 reiserfs_write_lock(dquot->dq_sb);
1978 ret =
1979 journal_begin(&th, dquot->dq_sb,
1980 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1981 if (ret)
1982 goto out;
1983 ret = dquot_acquire(dquot);
1984 err =
1985 journal_end(&th, dquot->dq_sb,
1986 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1987 if (!ret && err)
1988 ret = err;
1989 out:
1990 reiserfs_write_unlock(dquot->dq_sb);
1991 return ret;
1992 }
1993
1994 static int reiserfs_release_dquot(struct dquot *dquot)
1995 {
1996 struct reiserfs_transaction_handle th;
1997 int ret, err;
1998
1999 reiserfs_write_lock(dquot->dq_sb);
2000 ret =
2001 journal_begin(&th, dquot->dq_sb,
2002 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2003 if (ret) {
2004 /* Release dquot anyway to avoid endless cycle in dqput() */
2005 dquot_release(dquot);
2006 goto out;
2007 }
2008 ret = dquot_release(dquot);
2009 err =
2010 journal_end(&th, dquot->dq_sb,
2011 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2012 if (!ret && err)
2013 ret = err;
2014 out:
2015 reiserfs_write_unlock(dquot->dq_sb);
2016 return ret;
2017 }
2018
2019 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2020 {
2021 /* Are we journaling quotas? */
2022 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2023 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2024 dquot_mark_dquot_dirty(dquot);
2025 return reiserfs_write_dquot(dquot);
2026 } else
2027 return dquot_mark_dquot_dirty(dquot);
2028 }
2029
2030 static int reiserfs_write_info(struct super_block *sb, int type)
2031 {
2032 struct reiserfs_transaction_handle th;
2033 int ret, err;
2034
2035 /* Data block + inode block */
2036 reiserfs_write_lock(sb);
2037 ret = journal_begin(&th, sb, 2);
2038 if (ret)
2039 goto out;
2040 ret = dquot_commit_info(sb, type);
2041 err = journal_end(&th, sb, 2);
2042 if (!ret && err)
2043 ret = err;
2044 out:
2045 reiserfs_write_unlock(sb);
2046 return ret;
2047 }
2048
2049 /*
2050 * Turn on quotas during mount time - we need to find the quota file and such...
2051 */
2052 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2053 {
2054 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2055 REISERFS_SB(sb)->s_jquota_fmt, type);
2056 }
2057
2058 /*
2059 * Standard function to be called on quota_on
2060 */
2061 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2062 char *path, int remount)
2063 {
2064 int err;
2065 struct nameidata nd;
2066 struct inode *inode;
2067 struct reiserfs_transaction_handle th;
2068
2069 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2070 return -EINVAL;
2071 /* No more checks needed? Path and format_id are bogus anyway... */
2072 if (remount)
2073 return vfs_quota_on(sb, type, format_id, path, 1);
2074 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2075 if (err)
2076 return err;
2077 /* Quotafile not on the same filesystem? */
2078 if (nd.path.mnt->mnt_sb != sb) {
2079 path_put(&nd.path);
2080 return -EXDEV;
2081 }
2082 inode = nd.path.dentry->d_inode;
2083 /* We must not pack tails for quota files on reiserfs for quota IO to work */
2084 if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2085 err = reiserfs_unpack(inode, NULL);
2086 if (err) {
2087 reiserfs_warning(sb,
2088 "reiserfs: Unpacking tail of quota file failed"
2089 " (%d). Cannot turn on quotas.", err);
2090 path_put(&nd.path);
2091 return -EINVAL;
2092 }
2093 mark_inode_dirty(inode);
2094 }
2095 /* Journaling quota? */
2096 if (REISERFS_SB(sb)->s_qf_names[type]) {
2097 /* Quotafile not of fs root? */
2098 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
2099 reiserfs_warning(sb,
2100 "reiserfs: Quota file not on filesystem root. "
2101 "Journalled quota will not work.");
2102 }
2103
2104 /*
2105 * When we journal data on quota file, we have to flush journal to see
2106 * all updates to the file when we bypass pagecache...
2107 */
2108 if (reiserfs_file_data_log(inode)) {
2109 /* Just start temporary transaction and finish it */
2110 err = journal_begin(&th, sb, 1);
2111 if (err)
2112 return err;
2113 err = journal_end_sync(&th, sb, 1);
2114 if (err)
2115 return err;
2116 }
2117 path_put(&nd.path);
2118 return vfs_quota_on(sb, type, format_id, path, 0);
2119 }
2120
2121 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2122 * acquiring the locks... As quota files are never truncated and quota code
2123 * itself serializes the operations (and noone else should touch the files)
2124 * we don't have to be afraid of races */
2125 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2126 size_t len, loff_t off)
2127 {
2128 struct inode *inode = sb_dqopt(sb)->files[type];
2129 unsigned long blk = off >> sb->s_blocksize_bits;
2130 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2131 size_t toread;
2132 struct buffer_head tmp_bh, *bh;
2133 loff_t i_size = i_size_read(inode);
2134
2135 if (off > i_size)
2136 return 0;
2137 if (off + len > i_size)
2138 len = i_size - off;
2139 toread = len;
2140 while (toread > 0) {
2141 tocopy =
2142 sb->s_blocksize - offset <
2143 toread ? sb->s_blocksize - offset : toread;
2144 tmp_bh.b_state = 0;
2145 /* Quota files are without tails so we can safely use this function */
2146 reiserfs_write_lock(sb);
2147 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2148 reiserfs_write_unlock(sb);
2149 if (err)
2150 return err;
2151 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2152 memset(data, 0, tocopy);
2153 else {
2154 bh = sb_bread(sb, tmp_bh.b_blocknr);
2155 if (!bh)
2156 return -EIO;
2157 memcpy(data, bh->b_data + offset, tocopy);
2158 brelse(bh);
2159 }
2160 offset = 0;
2161 toread -= tocopy;
2162 data += tocopy;
2163 blk++;
2164 }
2165 return len;
2166 }
2167
2168 /* Write to quotafile (we know the transaction is already started and has
2169 * enough credits) */
2170 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2171 const char *data, size_t len, loff_t off)
2172 {
2173 struct inode *inode = sb_dqopt(sb)->files[type];
2174 unsigned long blk = off >> sb->s_blocksize_bits;
2175 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2176 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2177 size_t towrite = len;
2178 struct buffer_head tmp_bh, *bh;
2179
2180 if (!current->journal_info) {
2181 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2182 " cancelled because transaction is not started.\n",
2183 (unsigned long long)off, (unsigned long long)len);
2184 return -EIO;
2185 }
2186 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2187 while (towrite > 0) {
2188 tocopy = sb->s_blocksize - offset < towrite ?
2189 sb->s_blocksize - offset : towrite;
2190 tmp_bh.b_state = 0;
2191 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2192 if (err)
2193 goto out;
2194 if (offset || tocopy != sb->s_blocksize)
2195 bh = sb_bread(sb, tmp_bh.b_blocknr);
2196 else
2197 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2198 if (!bh) {
2199 err = -EIO;
2200 goto out;
2201 }
2202 lock_buffer(bh);
2203 memcpy(bh->b_data + offset, data, tocopy);
2204 flush_dcache_page(bh->b_page);
2205 set_buffer_uptodate(bh);
2206 unlock_buffer(bh);
2207 reiserfs_prepare_for_journal(sb, bh, 1);
2208 journal_mark_dirty(current->journal_info, sb, bh);
2209 if (!journal_quota)
2210 reiserfs_add_ordered_list(inode, bh);
2211 brelse(bh);
2212 offset = 0;
2213 towrite -= tocopy;
2214 data += tocopy;
2215 blk++;
2216 }
2217 out:
2218 if (len == towrite) {
2219 mutex_unlock(&inode->i_mutex);
2220 return err;
2221 }
2222 if (inode->i_size < off + len - towrite)
2223 i_size_write(inode, off + len - towrite);
2224 inode->i_version++;
2225 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2226 mark_inode_dirty(inode);
2227 mutex_unlock(&inode->i_mutex);
2228 return len - towrite;
2229 }
2230
2231 #endif
2232
2233 static int get_super_block(struct file_system_type *fs_type,
2234 int flags, const char *dev_name,
2235 void *data, struct vfsmount *mnt)
2236 {
2237 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2238 mnt);
2239 }
2240
2241 static int __init init_reiserfs_fs(void)
2242 {
2243 int ret;
2244
2245 if ((ret = init_inodecache())) {
2246 return ret;
2247 }
2248
2249 if ((ret = reiserfs_xattr_register_handlers()))
2250 goto failed_reiserfs_xattr_register_handlers;
2251
2252 reiserfs_proc_info_global_init();
2253 reiserfs_proc_register_global("version",
2254 reiserfs_global_version_in_proc);
2255
2256 ret = register_filesystem(&reiserfs_fs_type);
2257
2258 if (ret == 0) {
2259 return 0;
2260 }
2261
2262 reiserfs_xattr_unregister_handlers();
2263
2264 failed_reiserfs_xattr_register_handlers:
2265 reiserfs_proc_unregister_global("version");
2266 reiserfs_proc_info_global_done();
2267 destroy_inodecache();
2268
2269 return ret;
2270 }
2271
2272 static void __exit exit_reiserfs_fs(void)
2273 {
2274 reiserfs_xattr_unregister_handlers();
2275 reiserfs_proc_unregister_global("version");
2276 reiserfs_proc_info_global_done();
2277 unregister_filesystem(&reiserfs_fs_type);
2278 destroy_inodecache();
2279 }
2280
2281 struct file_system_type reiserfs_fs_type = {
2282 .owner = THIS_MODULE,
2283 .name = "reiserfs",
2284 .get_sb = get_super_block,
2285 .kill_sb = reiserfs_kill_sb,
2286 .fs_flags = FS_REQUIRES_DEV,
2287 };
2288
2289 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2290 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2291 MODULE_LICENSE("GPL");
2292
2293 module_init(init_reiserfs_fs);
2294 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree