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ACPI: ibm-acpi: fix initial status of backlight device
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / reiserfs / super.c
blob58ad4551a7c144d07a42d74843a5f568bb4f9366
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/mnt_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_kill_sb(struct super_block *s)
434 {
435 if (REISERFS_SB(s)) {
436 if (REISERFS_SB(s)->xattr_root) {
437 d_invalidate(REISERFS_SB(s)->xattr_root);
438 dput(REISERFS_SB(s)->xattr_root);
439 REISERFS_SB(s)->xattr_root = NULL;
440 }
441
442 if (REISERFS_SB(s)->priv_root) {
443 d_invalidate(REISERFS_SB(s)->priv_root);
444 dput(REISERFS_SB(s)->priv_root);
445 REISERFS_SB(s)->priv_root = NULL;
446 }
447 }
448
449 kill_block_super(s);
450 }
451
452 static void reiserfs_put_super(struct super_block *s)
453 {
454 struct reiserfs_transaction_handle th;
455 th.t_trans_id = 0;
456
457 /* change file system state to current state if it was mounted with read-write permissions */
458 if (!(s->s_flags & MS_RDONLY)) {
459 if (!journal_begin(&th, s, 10)) {
460 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
461 1);
462 set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
463 REISERFS_SB(s)->s_mount_state);
464 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
465 }
466 }
467
468 /* note, journal_release checks for readonly mount, and can decide not
469 ** to do a journal_end
470 */
471 journal_release(&th, s);
472
473 reiserfs_free_bitmap_cache(s);
474
475 brelse(SB_BUFFER_WITH_SB(s));
476
477 print_statistics(s);
478
479 if (REISERFS_SB(s)->reserved_blocks != 0) {
480 reiserfs_warning(s,
481 "green-2005: reiserfs_put_super: reserved blocks left %d",
482 REISERFS_SB(s)->reserved_blocks);
483 }
484
485 reiserfs_proc_info_done(s);
486
487 kfree(s->s_fs_info);
488 s->s_fs_info = NULL;
489
490 return;
491 }
492
493 static struct kmem_cache *reiserfs_inode_cachep;
494
495 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
496 {
497 struct reiserfs_inode_info *ei;
498 ei = (struct reiserfs_inode_info *)
499 kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
500 if (!ei)
501 return NULL;
502 return &ei->vfs_inode;
503 }
504
505 static void reiserfs_destroy_inode(struct inode *inode)
506 {
507 kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
508 }
509
510 static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags)
511 {
512 struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
513
514 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
515 SLAB_CTOR_CONSTRUCTOR) {
516 INIT_LIST_HEAD(&ei->i_prealloc_list);
517 inode_init_once(&ei->vfs_inode);
518 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
519 ei->i_acl_access = NULL;
520 ei->i_acl_default = NULL;
521 #endif
522 }
523 }
524
525 static int init_inodecache(void)
526 {
527 reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
528 sizeof(struct
529 reiserfs_inode_info),
530 0, (SLAB_RECLAIM_ACCOUNT|
531 SLAB_MEM_SPREAD),
532 init_once, NULL);
533 if (reiserfs_inode_cachep == NULL)
534 return -ENOMEM;
535 return 0;
536 }
537
538 static void destroy_inodecache(void)
539 {
540 kmem_cache_destroy(reiserfs_inode_cachep);
541 }
542
543 /* we don't mark inodes dirty, we just log them */
544 static void reiserfs_dirty_inode(struct inode *inode)
545 {
546 struct reiserfs_transaction_handle th;
547
548 int err = 0;
549 if (inode->i_sb->s_flags & MS_RDONLY) {
550 reiserfs_warning(inode->i_sb,
551 "clm-6006: writing inode %lu on readonly FS",
552 inode->i_ino);
553 return;
554 }
555 reiserfs_write_lock(inode->i_sb);
556
557 /* this is really only used for atime updates, so they don't have
558 ** to be included in O_SYNC or fsync
559 */
560 err = journal_begin(&th, inode->i_sb, 1);
561 if (err) {
562 reiserfs_write_unlock(inode->i_sb);
563 return;
564 }
565 reiserfs_update_sd(&th, inode);
566 journal_end(&th, inode->i_sb, 1);
567 reiserfs_write_unlock(inode->i_sb);
568 }
569
570 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
571 static void reiserfs_clear_inode(struct inode *inode)
572 {
573 struct posix_acl *acl;
574
575 acl = REISERFS_I(inode)->i_acl_access;
576 if (acl && !IS_ERR(acl))
577 posix_acl_release(acl);
578 REISERFS_I(inode)->i_acl_access = NULL;
579
580 acl = REISERFS_I(inode)->i_acl_default;
581 if (acl && !IS_ERR(acl))
582 posix_acl_release(acl);
583 REISERFS_I(inode)->i_acl_default = NULL;
584 }
585 #else
586 #define reiserfs_clear_inode NULL
587 #endif
588
589 #ifdef CONFIG_QUOTA
590 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
591 size_t, loff_t);
592 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
593 loff_t);
594 #endif
595
596 static struct super_operations reiserfs_sops = {
597 .alloc_inode = reiserfs_alloc_inode,
598 .destroy_inode = reiserfs_destroy_inode,
599 .write_inode = reiserfs_write_inode,
600 .dirty_inode = reiserfs_dirty_inode,
601 .delete_inode = reiserfs_delete_inode,
602 .clear_inode = reiserfs_clear_inode,
603 .put_super = reiserfs_put_super,
604 .write_super = reiserfs_write_super,
605 .sync_fs = reiserfs_sync_fs,
606 .write_super_lockfs = reiserfs_write_super_lockfs,
607 .unlockfs = reiserfs_unlockfs,
608 .statfs = reiserfs_statfs,
609 .remount_fs = reiserfs_remount,
610 #ifdef CONFIG_QUOTA
611 .quota_read = reiserfs_quota_read,
612 .quota_write = reiserfs_quota_write,
613 #endif
614 };
615
616 #ifdef CONFIG_QUOTA
617 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
618
619 static int reiserfs_dquot_initialize(struct inode *, int);
620 static int reiserfs_dquot_drop(struct inode *);
621 static int reiserfs_write_dquot(struct dquot *);
622 static int reiserfs_acquire_dquot(struct dquot *);
623 static int reiserfs_release_dquot(struct dquot *);
624 static int reiserfs_mark_dquot_dirty(struct dquot *);
625 static int reiserfs_write_info(struct super_block *, int);
626 static int reiserfs_quota_on(struct super_block *, int, int, char *);
627
628 static struct dquot_operations reiserfs_quota_operations = {
629 .initialize = reiserfs_dquot_initialize,
630 .drop = reiserfs_dquot_drop,
631 .alloc_space = dquot_alloc_space,
632 .alloc_inode = dquot_alloc_inode,
633 .free_space = dquot_free_space,
634 .free_inode = dquot_free_inode,
635 .transfer = dquot_transfer,
636 .write_dquot = reiserfs_write_dquot,
637 .acquire_dquot = reiserfs_acquire_dquot,
638 .release_dquot = reiserfs_release_dquot,
639 .mark_dirty = reiserfs_mark_dquot_dirty,
640 .write_info = reiserfs_write_info,
641 };
642
643 static struct quotactl_ops reiserfs_qctl_operations = {
644 .quota_on = reiserfs_quota_on,
645 .quota_off = vfs_quota_off,
646 .quota_sync = vfs_quota_sync,
647 .get_info = vfs_get_dqinfo,
648 .set_info = vfs_set_dqinfo,
649 .get_dqblk = vfs_get_dqblk,
650 .set_dqblk = vfs_set_dqblk,
651 };
652 #endif
653
654 static struct export_operations reiserfs_export_ops = {
655 .encode_fh = reiserfs_encode_fh,
656 .decode_fh = reiserfs_decode_fh,
657 .get_parent = reiserfs_get_parent,
658 .get_dentry = reiserfs_get_dentry,
659 };
660
661 /* this struct is used in reiserfs_getopt () for containing the value for those
662 mount options that have values rather than being toggles. */
663 typedef struct {
664 char *value;
665 int setmask; /* bitmask which is to set on mount_options bitmask when this
666 value is found, 0 is no bits are to be changed. */
667 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
668 value is found, 0 is no bits are to be changed. This is
669 applied BEFORE setmask */
670 } arg_desc_t;
671
672 /* Set this bit in arg_required to allow empty arguments */
673 #define REISERFS_OPT_ALLOWEMPTY 31
674
675 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
676 mount options */
677 typedef struct {
678 char *option_name;
679 int arg_required; /* 0 if argument is not required, not 0 otherwise */
680 const arg_desc_t *values; /* list of values accepted by an option */
681 int setmask; /* bitmask which is to set on mount_options bitmask when this
682 value is found, 0 is no bits are to be changed. */
683 int clrmask; /* bitmask which is to clear on mount_options bitmask when this
684 value is found, 0 is no bits are to be changed. This is
685 applied BEFORE setmask */
686 } opt_desc_t;
687
688 /* possible values for -o data= */
689 static const arg_desc_t logging_mode[] = {
690 {"ordered", 1 << REISERFS_DATA_ORDERED,
691 (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
692 {"journal", 1 << REISERFS_DATA_LOG,
693 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
694 {"writeback", 1 << REISERFS_DATA_WRITEBACK,
695 (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
696 {.value = NULL}
697 };
698
699 /* possible values for -o barrier= */
700 static const arg_desc_t barrier_mode[] = {
701 {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
702 {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
703 {.value = NULL}
704 };
705
706 /* possible values for "-o block-allocator=" and bits which are to be set in
707 s_mount_opt of reiserfs specific part of in-core super block */
708 static const arg_desc_t balloc[] = {
709 {"noborder", 1 << REISERFS_NO_BORDER, 0},
710 {"border", 0, 1 << REISERFS_NO_BORDER},
711 {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
712 {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
713 {"test4", 1 << REISERFS_TEST4, 0},
714 {"notest4", 0, 1 << REISERFS_TEST4},
715 {NULL, 0, 0}
716 };
717
718 static const arg_desc_t tails[] = {
719 {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
720 {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
721 {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
722 {NULL, 0, 0}
723 };
724
725 static const arg_desc_t error_actions[] = {
726 {"panic", 1 << REISERFS_ERROR_PANIC,
727 (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
728 {"ro-remount", 1 << REISERFS_ERROR_RO,
729 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
730 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
731 {"continue", 1 << REISERFS_ERROR_CONTINUE,
732 (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
733 #endif
734 {NULL, 0, 0},
735 };
736
737 /* proceed only one option from a list *cur - string containing of mount options
738 opts - array of options which are accepted
739 opt_arg - if option is found and requires an argument and if it is specifed
740 in the input - pointer to the argument is stored here
741 bit_flags - if option requires to set a certain bit - it is set here
742 return -1 if unknown option is found, opt->arg_required otherwise */
743 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
744 char **opt_arg, unsigned long *bit_flags)
745 {
746 char *p;
747 /* foo=bar,
748 ^ ^ ^
749 | | +-- option_end
750 | +-- arg_start
751 +-- option_start
752 */
753 const opt_desc_t *opt;
754 const arg_desc_t *arg;
755
756 p = *cur;
757
758 /* assume argument cannot contain commas */
759 *cur = strchr(p, ',');
760 if (*cur) {
761 *(*cur) = '\0';
762 (*cur)++;
763 }
764
765 if (!strncmp(p, "alloc=", 6)) {
766 /* Ugly special case, probably we should redo options parser so that
767 it can understand several arguments for some options, also so that
768 it can fill several bitfields with option values. */
769 if (reiserfs_parse_alloc_options(s, p + 6)) {
770 return -1;
771 } else {
772 return 0;
773 }
774 }
775
776 /* for every option in the list */
777 for (opt = opts; opt->option_name; opt++) {
778 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
779 if (bit_flags) {
780 if (opt->clrmask ==
781 (1 << REISERFS_UNSUPPORTED_OPT))
782 reiserfs_warning(s, "%s not supported.",
783 p);
784 else
785 *bit_flags &= ~opt->clrmask;
786 if (opt->setmask ==
787 (1 << REISERFS_UNSUPPORTED_OPT))
788 reiserfs_warning(s, "%s not supported.",
789 p);
790 else
791 *bit_flags |= opt->setmask;
792 }
793 break;
794 }
795 }
796 if (!opt->option_name) {
797 reiserfs_warning(s, "unknown mount option \"%s\"", p);
798 return -1;
799 }
800
801 p += strlen(opt->option_name);
802 switch (*p) {
803 case '=':
804 if (!opt->arg_required) {
805 reiserfs_warning(s,
806 "the option \"%s\" does not require an argument",
807 opt->option_name);
808 return -1;
809 }
810 break;
811
812 case 0:
813 if (opt->arg_required) {
814 reiserfs_warning(s,
815 "the option \"%s\" requires an argument",
816 opt->option_name);
817 return -1;
818 }
819 break;
820 default:
821 reiserfs_warning(s, "head of option \"%s\" is only correct",
822 opt->option_name);
823 return -1;
824 }
825
826 /* move to the argument, or to next option if argument is not required */
827 p++;
828
829 if (opt->arg_required
830 && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
831 && !strlen(p)) {
832 /* this catches "option=," if not allowed */
833 reiserfs_warning(s, "empty argument for \"%s\"",
834 opt->option_name);
835 return -1;
836 }
837
838 if (!opt->values) {
839 /* *=NULLopt_arg contains pointer to argument */
840 *opt_arg = p;
841 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
842 }
843
844 /* values possible for this option are listed in opt->values */
845 for (arg = opt->values; arg->value; arg++) {
846 if (!strcmp(p, arg->value)) {
847 if (bit_flags) {
848 *bit_flags &= ~arg->clrmask;
849 *bit_flags |= arg->setmask;
850 }
851 return opt->arg_required;
852 }
853 }
854
855 reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
856 opt->option_name);
857 return -1;
858 }
859
860 /* returns 0 if something is wrong in option string, 1 - otherwise */
861 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
862 unsigned long *mount_options,
863 /* after the parsing phase, contains the
864 collection of bitflags defining what
865 mount options were selected. */
866 unsigned long *blocks, /* strtol-ed from NNN of resize=NNN */
867 char **jdev_name,
868 unsigned int *commit_max_age)
869 {
870 int c;
871 char *arg = NULL;
872 char *pos;
873 opt_desc_t opts[] = {
874 /* Compatibility stuff, so that -o notail for old setups still work */
875 {"tails",.arg_required = 't',.values = tails},
876 {"notail",.clrmask =
877 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
878 {"conv",.setmask = 1 << REISERFS_CONVERT},
879 {"attrs",.setmask = 1 << REISERFS_ATTRS},
880 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
881 #ifdef CONFIG_REISERFS_FS_XATTR
882 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
883 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
884 #else
885 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
886 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
887 #endif
888 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
889 {"acl",.setmask = 1 << REISERFS_POSIXACL},
890 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
891 #else
892 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
893 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
894 #endif
895 {.option_name = "nolog"},
896 {"replayonly",.setmask = 1 << REPLAYONLY},
897 {"block-allocator",.arg_required = 'a',.values = balloc},
898 {"data",.arg_required = 'd',.values = logging_mode},
899 {"barrier",.arg_required = 'b',.values = barrier_mode},
900 {"resize",.arg_required = 'r',.values = NULL},
901 {"jdev",.arg_required = 'j',.values = NULL},
902 {"nolargeio",.arg_required = 'w',.values = NULL},
903 {"commit",.arg_required = 'c',.values = NULL},
904 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
905 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
906 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
907 {"errors",.arg_required = 'e',.values = error_actions},
908 {"usrjquota",.arg_required =
909 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
910 {"grpjquota",.arg_required =
911 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912 {"jqfmt",.arg_required = 'f',.values = NULL},
913 {.option_name = NULL}
914 };
915
916 *blocks = 0;
917 if (!options || !*options)
918 /* use default configuration: create tails, journaling on, no
919 conversion to newest format */
920 return 1;
921
922 for (pos = options; pos;) {
923 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
924 if (c == -1)
925 /* wrong option is given */
926 return 0;
927
928 if (c == 'r') {
929 char *p;
930
931 p = NULL;
932 /* "resize=NNN" or "resize=auto" */
933
934 if (!strcmp(arg, "auto")) {
935 /* From JFS code, to auto-get the size. */
936 *blocks =
937 s->s_bdev->bd_inode->i_size >> s->
938 s_blocksize_bits;
939 } else {
940 *blocks = simple_strtoul(arg, &p, 0);
941 if (*p != '\0') {
942 /* NNN does not look like a number */
943 reiserfs_warning(s,
944 "reiserfs_parse_options: bad value %s",
945 arg);
946 return 0;
947 }
948 }
949 }
950
951 if (c == 'c') {
952 char *p = NULL;
953 unsigned long val = simple_strtoul(arg, &p, 0);
954 /* commit=NNN (time in seconds) */
955 if (*p != '\0' || val >= (unsigned int)-1) {
956 reiserfs_warning(s,
957 "reiserfs_parse_options: bad value %s",
958 arg);
959 return 0;
960 }
961 *commit_max_age = (unsigned int)val;
962 }
963
964 if (c == 'w') {
965 reiserfs_warning(s, "reiserfs: nolargeio option is no longer supported");
966 return 0;
967 }
968
969 if (c == 'j') {
970 if (arg && *arg && jdev_name) {
971 if (*jdev_name) { //Hm, already assigned?
972 reiserfs_warning(s,
973 "reiserfs_parse_options: journal device was already specified to be %s",
974 *jdev_name);
975 return 0;
976 }
977 *jdev_name = arg;
978 }
979 }
980 #ifdef CONFIG_QUOTA
981 if (c == 'u' || c == 'g') {
982 int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
983
984 if (sb_any_quota_enabled(s)) {
985 reiserfs_warning(s,
986 "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
987 return 0;
988 }
989 if (*arg) { /* Some filename specified? */
990 if (REISERFS_SB(s)->s_qf_names[qtype]
991 && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
992 arg)) {
993 reiserfs_warning(s,
994 "reiserfs_parse_options: %s quota file already specified.",
995 QTYPE2NAME(qtype));
996 return 0;
997 }
998 if (strchr(arg, '/')) {
999 reiserfs_warning(s,
1000 "reiserfs_parse_options: quotafile must be on filesystem root.");
1001 return 0;
1002 }
1003 REISERFS_SB(s)->s_qf_names[qtype] =
1004 kmalloc(strlen(arg) + 1, GFP_KERNEL);
1005 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1006 reiserfs_warning(s,
1007 "reiserfs_parse_options: not enough memory for storing quotafile name.");
1008 return 0;
1009 }
1010 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1011 *mount_options |= 1 << REISERFS_QUOTA;
1012 } else {
1013 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1014 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1015 }
1016 }
1017 if (c == 'f') {
1018 if (!strcmp(arg, "vfsold"))
1019 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1020 else if (!strcmp(arg, "vfsv0"))
1021 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1022 else {
1023 reiserfs_warning(s,
1024 "reiserfs_parse_options: unknown quota format specified.");
1025 return 0;
1026 }
1027 }
1028 #else
1029 if (c == 'u' || c == 'g' || c == 'f') {
1030 reiserfs_warning(s,
1031 "reiserfs_parse_options: journalled quota options not supported.");
1032 return 0;
1033 }
1034 #endif
1035 }
1036
1037 #ifdef CONFIG_QUOTA
1038 if (!REISERFS_SB(s)->s_jquota_fmt
1039 && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1040 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1041 reiserfs_warning(s,
1042 "reiserfs_parse_options: journalled quota format not specified.");
1043 return 0;
1044 }
1045 /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1046 if (!(*mount_options & (1 << REISERFS_QUOTA))
1047 && sb_any_quota_enabled(s)) {
1048 reiserfs_warning(s,
1049 "reiserfs_parse_options: quota options must be present when quota is turned on.");
1050 return 0;
1051 }
1052 #endif
1053
1054 return 1;
1055 }
1056
1057 static void switch_data_mode(struct super_block *s, unsigned long mode)
1058 {
1059 REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1060 (1 << REISERFS_DATA_ORDERED) |
1061 (1 << REISERFS_DATA_WRITEBACK));
1062 REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1063 }
1064
1065 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1066 {
1067 if (mount_options & (1 << REISERFS_DATA_LOG)) {
1068 if (!reiserfs_data_log(s)) {
1069 switch_data_mode(s, REISERFS_DATA_LOG);
1070 reiserfs_info(s, "switching to journaled data mode\n");
1071 }
1072 } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1073 if (!reiserfs_data_ordered(s)) {
1074 switch_data_mode(s, REISERFS_DATA_ORDERED);
1075 reiserfs_info(s, "switching to ordered data mode\n");
1076 }
1077 } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1078 if (!reiserfs_data_writeback(s)) {
1079 switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1080 reiserfs_info(s, "switching to writeback data mode\n");
1081 }
1082 }
1083 }
1084
1085 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1086 {
1087 int flush = (1 << REISERFS_BARRIER_FLUSH);
1088 int none = (1 << REISERFS_BARRIER_NONE);
1089 int all_barrier = flush | none;
1090
1091 if (bits & all_barrier) {
1092 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1093 if (bits & flush) {
1094 REISERFS_SB(s)->s_mount_opt |= flush;
1095 printk("reiserfs: enabling write barrier flush mode\n");
1096 } else if (bits & none) {
1097 REISERFS_SB(s)->s_mount_opt |= none;
1098 printk("reiserfs: write barriers turned off\n");
1099 }
1100 }
1101 }
1102
1103 static void handle_attrs(struct super_block *s)
1104 {
1105 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1106
1107 if (reiserfs_attrs(s)) {
1108 if (old_format_only(s)) {
1109 reiserfs_warning(s,
1110 "reiserfs: cannot support attributes on 3.5.x disk format");
1111 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1112 return;
1113 }
1114 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1115 reiserfs_warning(s,
1116 "reiserfs: cannot support attributes until flag is set in super-block");
1117 REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1118 }
1119 }
1120 }
1121
1122 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1123 {
1124 struct reiserfs_super_block *rs;
1125 struct reiserfs_transaction_handle th;
1126 unsigned long blocks;
1127 unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1128 unsigned long safe_mask = 0;
1129 unsigned int commit_max_age = (unsigned int)-1;
1130 struct reiserfs_journal *journal = SB_JOURNAL(s);
1131 int err;
1132 #ifdef CONFIG_QUOTA
1133 int i;
1134 #endif
1135
1136 rs = SB_DISK_SUPER_BLOCK(s);
1137
1138 if (!reiserfs_parse_options
1139 (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1140 #ifdef CONFIG_QUOTA
1141 for (i = 0; i < MAXQUOTAS; i++) {
1142 kfree(REISERFS_SB(s)->s_qf_names[i]);
1143 REISERFS_SB(s)->s_qf_names[i] = NULL;
1144 }
1145 #endif
1146 return -EINVAL;
1147 }
1148
1149 handle_attrs(s);
1150
1151 /* Add options that are safe here */
1152 safe_mask |= 1 << REISERFS_SMALLTAIL;
1153 safe_mask |= 1 << REISERFS_LARGETAIL;
1154 safe_mask |= 1 << REISERFS_NO_BORDER;
1155 safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1156 safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1157 safe_mask |= 1 << REISERFS_TEST4;
1158 safe_mask |= 1 << REISERFS_ATTRS;
1159 safe_mask |= 1 << REISERFS_XATTRS_USER;
1160 safe_mask |= 1 << REISERFS_POSIXACL;
1161 safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1162 safe_mask |= 1 << REISERFS_BARRIER_NONE;
1163 safe_mask |= 1 << REISERFS_ERROR_RO;
1164 safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1165 safe_mask |= 1 << REISERFS_ERROR_PANIC;
1166 safe_mask |= 1 << REISERFS_QUOTA;
1167
1168 /* Update the bitmask, taking care to keep
1169 * the bits we're not allowed to change here */
1170 REISERFS_SB(s)->s_mount_opt =
1171 (REISERFS_SB(s)->
1172 s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1173
1174 if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1175 journal->j_max_commit_age = commit_max_age;
1176 journal->j_max_trans_age = commit_max_age;
1177 } else if (commit_max_age == 0) {
1178 /* 0 means restore defaults. */
1179 journal->j_max_commit_age = journal->j_default_max_commit_age;
1180 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1181 }
1182
1183 if (blocks) {
1184 int rc = reiserfs_resize(s, blocks);
1185 if (rc != 0)
1186 return rc;
1187 }
1188
1189 if (*mount_flags & MS_RDONLY) {
1190 reiserfs_xattr_init(s, *mount_flags);
1191 /* remount read-only */
1192 if (s->s_flags & MS_RDONLY)
1193 /* it is read-only already */
1194 return 0;
1195 /* try to remount file system with read-only permissions */
1196 if (sb_umount_state(rs) == REISERFS_VALID_FS
1197 || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1198 return 0;
1199 }
1200
1201 err = journal_begin(&th, s, 10);
1202 if (err)
1203 return err;
1204
1205 /* Mounting a rw partition read-only. */
1206 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1207 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1208 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1209 } else {
1210 /* remount read-write */
1211 if (!(s->s_flags & MS_RDONLY)) {
1212 reiserfs_xattr_init(s, *mount_flags);
1213 return 0; /* We are read-write already */
1214 }
1215
1216 if (reiserfs_is_journal_aborted(journal))
1217 return journal->j_errno;
1218
1219 handle_data_mode(s, mount_options);
1220 handle_barrier_mode(s, mount_options);
1221 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1222 s->s_flags &= ~MS_RDONLY; /* now it is safe to call journal_begin */
1223 err = journal_begin(&th, s, 10);
1224 if (err)
1225 return err;
1226
1227 /* Mount a partition which is read-only, read-write */
1228 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1229 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1230 s->s_flags &= ~MS_RDONLY;
1231 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1232 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1233 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1234 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1235 }
1236 /* this will force a full flush of all journal lists */
1237 SB_JOURNAL(s)->j_must_wait = 1;
1238 err = journal_end(&th, s, 10);
1239 if (err)
1240 return err;
1241 s->s_dirt = 0;
1242
1243 if (!(*mount_flags & MS_RDONLY)) {
1244 finish_unfinished(s);
1245 reiserfs_xattr_init(s, *mount_flags);
1246 }
1247
1248 return 0;
1249 }
1250
1251 static int read_super_block(struct super_block *s, int offset)
1252 {
1253 struct buffer_head *bh;
1254 struct reiserfs_super_block *rs;
1255 int fs_blocksize;
1256
1257 bh = sb_bread(s, offset / s->s_blocksize);
1258 if (!bh) {
1259 reiserfs_warning(s, "sh-2006: read_super_block: "
1260 "bread failed (dev %s, block %lu, size %lu)",
1261 reiserfs_bdevname(s), offset / s->s_blocksize,
1262 s->s_blocksize);
1263 return 1;
1264 }
1265
1266 rs = (struct reiserfs_super_block *)bh->b_data;
1267 if (!is_any_reiserfs_magic_string(rs)) {
1268 brelse(bh);
1269 return 1;
1270 }
1271 //
1272 // ok, reiserfs signature (old or new) found in at the given offset
1273 //
1274 fs_blocksize = sb_blocksize(rs);
1275 brelse(bh);
1276 sb_set_blocksize(s, fs_blocksize);
1277
1278 bh = sb_bread(s, offset / s->s_blocksize);
1279 if (!bh) {
1280 reiserfs_warning(s, "sh-2007: read_super_block: "
1281 "bread failed (dev %s, block %lu, size %lu)\n",
1282 reiserfs_bdevname(s), offset / s->s_blocksize,
1283 s->s_blocksize);
1284 return 1;
1285 }
1286
1287 rs = (struct reiserfs_super_block *)bh->b_data;
1288 if (sb_blocksize(rs) != s->s_blocksize) {
1289 reiserfs_warning(s, "sh-2011: read_super_block: "
1290 "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1291 reiserfs_bdevname(s),
1292 (unsigned long long)bh->b_blocknr,
1293 s->s_blocksize);
1294 brelse(bh);
1295 return 1;
1296 }
1297
1298 if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1299 brelse(bh);
1300 reiserfs_warning(s,
1301 "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1302 "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1303 "get newer reiserfsprogs package");
1304 return 1;
1305 }
1306
1307 SB_BUFFER_WITH_SB(s) = bh;
1308 SB_DISK_SUPER_BLOCK(s) = rs;
1309
1310 if (is_reiserfs_jr(rs)) {
1311 /* magic is of non-standard journal filesystem, look at s_version to
1312 find which format is in use */
1313 if (sb_version(rs) == REISERFS_VERSION_2)
1314 reiserfs_warning(s,
1315 "read_super_block: found reiserfs format \"3.6\""
1316 " with non-standard journal");
1317 else if (sb_version(rs) == REISERFS_VERSION_1)
1318 reiserfs_warning(s,
1319 "read_super_block: found reiserfs format \"3.5\""
1320 " with non-standard journal");
1321 else {
1322 reiserfs_warning(s,
1323 "sh-2012: read_super_block: found unknown "
1324 "format \"%u\" of reiserfs with non-standard magic",
1325 sb_version(rs));
1326 return 1;
1327 }
1328 } else
1329 /* s_version of standard format may contain incorrect information,
1330 so we just look at the magic string */
1331 reiserfs_info(s,
1332 "found reiserfs format \"%s\" with standard journal\n",
1333 is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1334
1335 s->s_op = &reiserfs_sops;
1336 s->s_export_op = &reiserfs_export_ops;
1337 #ifdef CONFIG_QUOTA
1338 s->s_qcop = &reiserfs_qctl_operations;
1339 s->dq_op = &reiserfs_quota_operations;
1340 #endif
1341
1342 /* new format is limited by the 32 bit wide i_blocks field, want to
1343 ** be one full block below that.
1344 */
1345 s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1346 return 0;
1347 }
1348
1349 /* after journal replay, reread all bitmap and super blocks */
1350 static int reread_meta_blocks(struct super_block *s)
1351 {
1352 ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1353 wait_on_buffer(SB_BUFFER_WITH_SB(s));
1354 if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1355 reiserfs_warning(s,
1356 "reread_meta_blocks, error reading the super");
1357 return 1;
1358 }
1359
1360 return 0;
1361 }
1362
1363 /////////////////////////////////////////////////////
1364 // hash detection stuff
1365
1366 // if root directory is empty - we set default - Yura's - hash and
1367 // warn about it
1368 // FIXME: we look for only one name in a directory. If tea and yura
1369 // bith have the same value - we ask user to send report to the
1370 // mailing list
1371 static __u32 find_hash_out(struct super_block *s)
1372 {
1373 int retval;
1374 struct inode *inode;
1375 struct cpu_key key;
1376 INITIALIZE_PATH(path);
1377 struct reiserfs_dir_entry de;
1378 __u32 hash = DEFAULT_HASH;
1379
1380 inode = s->s_root->d_inode;
1381
1382 do { // Some serious "goto"-hater was there ;)
1383 u32 teahash, r5hash, yurahash;
1384
1385 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1386 retval = search_by_entry_key(s, &key, &path, &de);
1387 if (retval == IO_ERROR) {
1388 pathrelse(&path);
1389 return UNSET_HASH;
1390 }
1391 if (retval == NAME_NOT_FOUND)
1392 de.de_entry_num--;
1393 set_de_name_and_namelen(&de);
1394 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1395 /* allow override in this case */
1396 if (reiserfs_rupasov_hash(s)) {
1397 hash = YURA_HASH;
1398 }
1399 reiserfs_warning(s, "FS seems to be empty, autodetect "
1400 "is using the default hash");
1401 break;
1402 }
1403 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1404 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1405 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1406 if (((teahash == r5hash)
1407 &&
1408 (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1409 == r5hash)) || ((teahash == yurahash)
1410 && (yurahash ==
1411 GET_HASH_VALUE(deh_offset
1412 (&
1413 (de.
1414 de_deh[de.
1415 de_entry_num])))))
1416 || ((r5hash == yurahash)
1417 && (yurahash ==
1418 GET_HASH_VALUE(deh_offset
1419 (&(de.de_deh[de.de_entry_num])))))) {
1420 reiserfs_warning(s,
1421 "Unable to automatically detect hash function. "
1422 "Please mount with -o hash={tea,rupasov,r5}",
1423 reiserfs_bdevname(s));
1424 hash = UNSET_HASH;
1425 break;
1426 }
1427 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1428 yurahash)
1429 hash = YURA_HASH;
1430 else if (GET_HASH_VALUE
1431 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1432 hash = TEA_HASH;
1433 else if (GET_HASH_VALUE
1434 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1435 hash = R5_HASH;
1436 else {
1437 reiserfs_warning(s, "Unrecognised hash function");
1438 hash = UNSET_HASH;
1439 }
1440 } while (0);
1441
1442 pathrelse(&path);
1443 return hash;
1444 }
1445
1446 // finds out which hash names are sorted with
1447 static int what_hash(struct super_block *s)
1448 {
1449 __u32 code;
1450
1451 code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1452
1453 /* reiserfs_hash_detect() == true if any of the hash mount options
1454 ** were used. We must check them to make sure the user isn't
1455 ** using a bad hash value
1456 */
1457 if (code == UNSET_HASH || reiserfs_hash_detect(s))
1458 code = find_hash_out(s);
1459
1460 if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1461 /* detection has found the hash, and we must check against the
1462 ** mount options
1463 */
1464 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1465 reiserfs_warning(s, "Error, %s hash detected, "
1466 "unable to force rupasov hash",
1467 reiserfs_hashname(code));
1468 code = UNSET_HASH;
1469 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1470 reiserfs_warning(s, "Error, %s hash detected, "
1471 "unable to force tea hash",
1472 reiserfs_hashname(code));
1473 code = UNSET_HASH;
1474 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1475 reiserfs_warning(s, "Error, %s hash detected, "
1476 "unable to force r5 hash",
1477 reiserfs_hashname(code));
1478 code = UNSET_HASH;
1479 }
1480 } else {
1481 /* find_hash_out was not called or could not determine the hash */
1482 if (reiserfs_rupasov_hash(s)) {
1483 code = YURA_HASH;
1484 } else if (reiserfs_tea_hash(s)) {
1485 code = TEA_HASH;
1486 } else if (reiserfs_r5_hash(s)) {
1487 code = R5_HASH;
1488 }
1489 }
1490
1491 /* if we are mounted RW, and we have a new valid hash code, update
1492 ** the super
1493 */
1494 if (code != UNSET_HASH &&
1495 !(s->s_flags & MS_RDONLY) &&
1496 code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1497 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1498 }
1499 return code;
1500 }
1501
1502 // return pointer to appropriate function
1503 static hashf_t hash_function(struct super_block *s)
1504 {
1505 switch (what_hash(s)) {
1506 case TEA_HASH:
1507 reiserfs_info(s, "Using tea hash to sort names\n");
1508 return keyed_hash;
1509 case YURA_HASH:
1510 reiserfs_info(s, "Using rupasov hash to sort names\n");
1511 return yura_hash;
1512 case R5_HASH:
1513 reiserfs_info(s, "Using r5 hash to sort names\n");
1514 return r5_hash;
1515 }
1516 return NULL;
1517 }
1518
1519 // this is used to set up correct value for old partitions
1520 static int function2code(hashf_t func)
1521 {
1522 if (func == keyed_hash)
1523 return TEA_HASH;
1524 if (func == yura_hash)
1525 return YURA_HASH;
1526 if (func == r5_hash)
1527 return R5_HASH;
1528
1529 BUG(); // should never happen
1530
1531 return 0;
1532 }
1533
1534 #define SWARN(silent, s, ...) \
1535 if (!(silent)) \
1536 reiserfs_warning (s, __VA_ARGS__)
1537
1538 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1539 {
1540 struct inode *root_inode;
1541 struct reiserfs_transaction_handle th;
1542 int old_format = 0;
1543 unsigned long blocks;
1544 unsigned int commit_max_age = 0;
1545 int jinit_done = 0;
1546 struct reiserfs_iget_args args;
1547 struct reiserfs_super_block *rs;
1548 char *jdev_name;
1549 struct reiserfs_sb_info *sbi;
1550 int errval = -EINVAL;
1551
1552 sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1553 if (!sbi) {
1554 errval = -ENOMEM;
1555 goto error;
1556 }
1557 s->s_fs_info = sbi;
1558 /* Set default values for options: non-aggressive tails, RO on errors */
1559 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1560 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1561 /* no preallocation minimum, be smart in
1562 reiserfs_file_write instead */
1563 REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1564 /* Preallocate by 16 blocks (17-1) at once */
1565 REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1566 /* Initialize the rwsem for xattr dir */
1567 init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1568
1569 /* setup default block allocator options */
1570 reiserfs_init_alloc_options(s);
1571
1572 jdev_name = NULL;
1573 if (reiserfs_parse_options
1574 (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1575 &commit_max_age) == 0) {
1576 goto error;
1577 }
1578
1579 if (blocks) {
1580 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1581 "for remount only");
1582 goto error;
1583 }
1584
1585 /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1586 if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1587 old_format = 1;
1588 /* try new format (64-th 1k block), which can contain reiserfs super block */
1589 else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1590 SWARN(silent, s,
1591 "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1592 reiserfs_bdevname(s));
1593 goto error;
1594 }
1595
1596 rs = SB_DISK_SUPER_BLOCK(s);
1597 /* Let's do basic sanity check to verify that underlying device is not
1598 smaller than the filesystem. If the check fails then abort and scream,
1599 because bad stuff will happen otherwise. */
1600 if (s->s_bdev && s->s_bdev->bd_inode
1601 && i_size_read(s->s_bdev->bd_inode) <
1602 sb_block_count(rs) * sb_blocksize(rs)) {
1603 SWARN(silent, s,
1604 "Filesystem on %s cannot be mounted because it is bigger than the device",
1605 reiserfs_bdevname(s));
1606 SWARN(silent, s,
1607 "You may need to run fsck or increase size of your LVM partition");
1608 SWARN(silent, s,
1609 "Or may be you forgot to reboot after fdisk when it told you to");
1610 goto error;
1611 }
1612
1613 sbi->s_mount_state = SB_REISERFS_STATE(s);
1614 sbi->s_mount_state = REISERFS_VALID_FS;
1615
1616 if ((errval = reiserfs_init_bitmap_cache(s))) {
1617 SWARN(silent, s,
1618 "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1619 goto error;
1620 }
1621 errval = -EINVAL;
1622 #ifdef CONFIG_REISERFS_CHECK
1623 SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1624 SWARN(silent, s, "- it is slow mode for debugging.");
1625 #endif
1626
1627 /* make data=ordered the default */
1628 if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1629 !reiserfs_data_writeback(s)) {
1630 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1631 }
1632
1633 if (reiserfs_data_log(s)) {
1634 reiserfs_info(s, "using journaled data mode\n");
1635 } else if (reiserfs_data_ordered(s)) {
1636 reiserfs_info(s, "using ordered data mode\n");
1637 } else {
1638 reiserfs_info(s, "using writeback data mode\n");
1639 }
1640 if (reiserfs_barrier_flush(s)) {
1641 printk("reiserfs: using flush barriers\n");
1642 }
1643 // set_device_ro(s->s_dev, 1) ;
1644 if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1645 SWARN(silent, s,
1646 "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1647 goto error;
1648 } else {
1649 jinit_done = 1; /* once this is set, journal_release must be called
1650 ** if we error out of the mount
1651 */
1652 }
1653 if (reread_meta_blocks(s)) {
1654 SWARN(silent, s,
1655 "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1656 goto error;
1657 }
1658
1659 if (replay_only(s))
1660 goto error;
1661
1662 if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1663 SWARN(silent, s,
1664 "clm-7000: Detected readonly device, marking FS readonly");
1665 s->s_flags |= MS_RDONLY;
1666 }
1667 args.objectid = REISERFS_ROOT_OBJECTID;
1668 args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1669 root_inode =
1670 iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1671 reiserfs_init_locked_inode, (void *)(&args));
1672 if (!root_inode) {
1673 SWARN(silent, s,
1674 "jmacd-10: reiserfs_fill_super: get root inode failed");
1675 goto error;
1676 }
1677
1678 if (root_inode->i_state & I_NEW) {
1679 reiserfs_read_locked_inode(root_inode, &args);
1680 unlock_new_inode(root_inode);
1681 }
1682
1683 s->s_root = d_alloc_root(root_inode);
1684 if (!s->s_root) {
1685 iput(root_inode);
1686 goto error;
1687 }
1688 // define and initialize hash function
1689 sbi->s_hash_function = hash_function(s);
1690 if (sbi->s_hash_function == NULL) {
1691 dput(s->s_root);
1692 s->s_root = NULL;
1693 goto error;
1694 }
1695
1696 if (is_reiserfs_3_5(rs)
1697 || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1698 set_bit(REISERFS_3_5, &(sbi->s_properties));
1699 else if (old_format)
1700 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1701 else
1702 set_bit(REISERFS_3_6, &(sbi->s_properties));
1703
1704 if (!(s->s_flags & MS_RDONLY)) {
1705
1706 errval = journal_begin(&th, s, 1);
1707 if (errval) {
1708 dput(s->s_root);
1709 s->s_root = NULL;
1710 goto error;
1711 }
1712 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1713
1714 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1715 set_sb_fs_state(rs, 0);
1716
1717 if (old_format_only(s)) {
1718 /* filesystem of format 3.5 either with standard or non-standard
1719 journal */
1720 if (convert_reiserfs(s)) {
1721 /* and -o conv is given */
1722 if (!silent)
1723 reiserfs_info(s,
1724 "converting 3.5 filesystem to the 3.6 format");
1725
1726 if (is_reiserfs_3_5(rs))
1727 /* put magic string of 3.6 format. 2.2 will not be able to
1728 mount this filesystem anymore */
1729 memcpy(rs->s_v1.s_magic,
1730 reiserfs_3_6_magic_string,
1731 sizeof
1732 (reiserfs_3_6_magic_string));
1733
1734 set_sb_version(rs, REISERFS_VERSION_2);
1735 reiserfs_convert_objectid_map_v1(s);
1736 set_bit(REISERFS_3_6, &(sbi->s_properties));
1737 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1738 } else if (!silent) {
1739 reiserfs_info(s, "using 3.5.x disk format\n");
1740 }
1741 }
1742
1743 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1744 errval = journal_end(&th, s, 1);
1745 if (errval) {
1746 dput(s->s_root);
1747 s->s_root = NULL;
1748 goto error;
1749 }
1750
1751 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1752 dput(s->s_root);
1753 s->s_root = NULL;
1754 goto error;
1755 }
1756
1757 /* look for files which were to be removed in previous session */
1758 finish_unfinished(s);
1759 } else {
1760 if (old_format_only(s) && !silent) {
1761 reiserfs_info(s, "using 3.5.x disk format\n");
1762 }
1763
1764 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1765 dput(s->s_root);
1766 s->s_root = NULL;
1767 goto error;
1768 }
1769 }
1770 // mark hash in super block: it could be unset. overwrite should be ok
1771 set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1772
1773 handle_attrs(s);
1774
1775 reiserfs_proc_info_init(s);
1776
1777 init_waitqueue_head(&(sbi->s_wait));
1778 spin_lock_init(&sbi->bitmap_lock);
1779
1780 return (0);
1781
1782 error:
1783 if (jinit_done) { /* kill the commit thread, free journal ram */
1784 journal_release_error(NULL, s);
1785 }
1786
1787 reiserfs_free_bitmap_cache(s);
1788 if (SB_BUFFER_WITH_SB(s))
1789 brelse(SB_BUFFER_WITH_SB(s));
1790 #ifdef CONFIG_QUOTA
1791 {
1792 int j;
1793 for (j = 0; j < MAXQUOTAS; j++) {
1794 kfree(sbi->s_qf_names[j]);
1795 sbi->s_qf_names[j] = NULL;
1796 }
1797 }
1798 #endif
1799 kfree(sbi);
1800
1801 s->s_fs_info = NULL;
1802 return errval;
1803 }
1804
1805 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1806 {
1807 struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1808
1809 buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1810 buf->f_bfree = sb_free_blocks(rs);
1811 buf->f_bavail = buf->f_bfree;
1812 buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1813 buf->f_bsize = dentry->d_sb->s_blocksize;
1814 /* changed to accommodate gcc folks. */
1815 buf->f_type = REISERFS_SUPER_MAGIC;
1816 return 0;
1817 }
1818
1819 #ifdef CONFIG_QUOTA
1820 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1821 {
1822 struct reiserfs_transaction_handle th;
1823 int ret, err;
1824
1825 /* We may create quota structure so we need to reserve enough blocks */
1826 reiserfs_write_lock(inode->i_sb);
1827 ret =
1828 journal_begin(&th, inode->i_sb,
1829 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1830 if (ret)
1831 goto out;
1832 ret = dquot_initialize(inode, type);
1833 err =
1834 journal_end(&th, inode->i_sb,
1835 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1836 if (!ret && err)
1837 ret = err;
1838 out:
1839 reiserfs_write_unlock(inode->i_sb);
1840 return ret;
1841 }
1842
1843 static int reiserfs_dquot_drop(struct inode *inode)
1844 {
1845 struct reiserfs_transaction_handle th;
1846 int ret, err;
1847
1848 /* We may delete quota structure so we need to reserve enough blocks */
1849 reiserfs_write_lock(inode->i_sb);
1850 ret =
1851 journal_begin(&th, inode->i_sb,
1852 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1853 if (ret)
1854 goto out;
1855 ret = dquot_drop(inode);
1856 err =
1857 journal_end(&th, inode->i_sb,
1858 2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1859 if (!ret && err)
1860 ret = err;
1861 out:
1862 reiserfs_write_unlock(inode->i_sb);
1863 return ret;
1864 }
1865
1866 static int reiserfs_write_dquot(struct dquot *dquot)
1867 {
1868 struct reiserfs_transaction_handle th;
1869 int ret, err;
1870
1871 reiserfs_write_lock(dquot->dq_sb);
1872 ret =
1873 journal_begin(&th, dquot->dq_sb,
1874 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1875 if (ret)
1876 goto out;
1877 ret = dquot_commit(dquot);
1878 err =
1879 journal_end(&th, dquot->dq_sb,
1880 REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1881 if (!ret && err)
1882 ret = err;
1883 out:
1884 reiserfs_write_unlock(dquot->dq_sb);
1885 return ret;
1886 }
1887
1888 static int reiserfs_acquire_dquot(struct dquot *dquot)
1889 {
1890 struct reiserfs_transaction_handle th;
1891 int ret, err;
1892
1893 reiserfs_write_lock(dquot->dq_sb);
1894 ret =
1895 journal_begin(&th, dquot->dq_sb,
1896 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1897 if (ret)
1898 goto out;
1899 ret = dquot_acquire(dquot);
1900 err =
1901 journal_end(&th, dquot->dq_sb,
1902 REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1903 if (!ret && err)
1904 ret = err;
1905 out:
1906 reiserfs_write_unlock(dquot->dq_sb);
1907 return ret;
1908 }
1909
1910 static int reiserfs_release_dquot(struct dquot *dquot)
1911 {
1912 struct reiserfs_transaction_handle th;
1913 int ret, err;
1914
1915 reiserfs_write_lock(dquot->dq_sb);
1916 ret =
1917 journal_begin(&th, dquot->dq_sb,
1918 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1919 if (ret)
1920 goto out;
1921 ret = dquot_release(dquot);
1922 err =
1923 journal_end(&th, dquot->dq_sb,
1924 REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1925 if (!ret && err)
1926 ret = err;
1927 out:
1928 reiserfs_write_unlock(dquot->dq_sb);
1929 return ret;
1930 }
1931
1932 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1933 {
1934 /* Are we journalling quotas? */
1935 if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1936 REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1937 dquot_mark_dquot_dirty(dquot);
1938 return reiserfs_write_dquot(dquot);
1939 } else
1940 return dquot_mark_dquot_dirty(dquot);
1941 }
1942
1943 static int reiserfs_write_info(struct super_block *sb, int type)
1944 {
1945 struct reiserfs_transaction_handle th;
1946 int ret, err;
1947
1948 /* Data block + inode block */
1949 reiserfs_write_lock(sb);
1950 ret = journal_begin(&th, sb, 2);
1951 if (ret)
1952 goto out;
1953 ret = dquot_commit_info(sb, type);
1954 err = journal_end(&th, sb, 2);
1955 if (!ret && err)
1956 ret = err;
1957 out:
1958 reiserfs_write_unlock(sb);
1959 return ret;
1960 }
1961
1962 /*
1963 * Turn on quotas during mount time - we need to find the quota file and such...
1964 */
1965 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
1966 {
1967 return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
1968 REISERFS_SB(sb)->s_jquota_fmt, type);
1969 }
1970
1971 /*
1972 * Standard function to be called on quota_on
1973 */
1974 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
1975 char *path)
1976 {
1977 int err;
1978 struct nameidata nd;
1979
1980 if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
1981 return -EINVAL;
1982 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
1983 if (err)
1984 return err;
1985 /* Quotafile not on the same filesystem? */
1986 if (nd.mnt->mnt_sb != sb) {
1987 path_release(&nd);
1988 return -EXDEV;
1989 }
1990 /* We must not pack tails for quota files on reiserfs for quota IO to work */
1991 if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
1992 reiserfs_warning(sb,
1993 "reiserfs: Quota file must have tail packing disabled.");
1994 path_release(&nd);
1995 return -EINVAL;
1996 }
1997 /* Not journalling quota? No more tests needed... */
1998 if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
1999 !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2000 path_release(&nd);
2001 return vfs_quota_on(sb, type, format_id, path);
2002 }
2003 /* Quotafile not of fs root? */
2004 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2005 reiserfs_warning(sb,
2006 "reiserfs: Quota file not on filesystem root. "
2007 "Journalled quota will not work.");
2008 path_release(&nd);
2009 return vfs_quota_on(sb, type, format_id, path);
2010 }
2011
2012 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2013 * acquiring the locks... As quota files are never truncated and quota code
2014 * itself serializes the operations (and noone else should touch the files)
2015 * we don't have to be afraid of races */
2016 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2017 size_t len, loff_t off)
2018 {
2019 struct inode *inode = sb_dqopt(sb)->files[type];
2020 unsigned long blk = off >> sb->s_blocksize_bits;
2021 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2022 size_t toread;
2023 struct buffer_head tmp_bh, *bh;
2024 loff_t i_size = i_size_read(inode);
2025
2026 if (off > i_size)
2027 return 0;
2028 if (off + len > i_size)
2029 len = i_size - off;
2030 toread = len;
2031 while (toread > 0) {
2032 tocopy =
2033 sb->s_blocksize - offset <
2034 toread ? sb->s_blocksize - offset : toread;
2035 tmp_bh.b_state = 0;
2036 /* Quota files are without tails so we can safely use this function */
2037 reiserfs_write_lock(sb);
2038 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2039 reiserfs_write_unlock(sb);
2040 if (err)
2041 return err;
2042 if (!buffer_mapped(&tmp_bh)) /* A hole? */
2043 memset(data, 0, tocopy);
2044 else {
2045 bh = sb_bread(sb, tmp_bh.b_blocknr);
2046 if (!bh)
2047 return -EIO;
2048 memcpy(data, bh->b_data + offset, tocopy);
2049 brelse(bh);
2050 }
2051 offset = 0;
2052 toread -= tocopy;
2053 data += tocopy;
2054 blk++;
2055 }
2056 return len;
2057 }
2058
2059 /* Write to quotafile (we know the transaction is already started and has
2060 * enough credits) */
2061 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2062 const char *data, size_t len, loff_t off)
2063 {
2064 struct inode *inode = sb_dqopt(sb)->files[type];
2065 unsigned long blk = off >> sb->s_blocksize_bits;
2066 int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2067 int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2068 size_t towrite = len;
2069 struct buffer_head tmp_bh, *bh;
2070
2071 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2072 while (towrite > 0) {
2073 tocopy = sb->s_blocksize - offset < towrite ?
2074 sb->s_blocksize - offset : towrite;
2075 tmp_bh.b_state = 0;
2076 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2077 if (err)
2078 goto out;
2079 if (offset || tocopy != sb->s_blocksize)
2080 bh = sb_bread(sb, tmp_bh.b_blocknr);
2081 else
2082 bh = sb_getblk(sb, tmp_bh.b_blocknr);
2083 if (!bh) {
2084 err = -EIO;
2085 goto out;
2086 }
2087 lock_buffer(bh);
2088 memcpy(bh->b_data + offset, data, tocopy);
2089 flush_dcache_page(bh->b_page);
2090 set_buffer_uptodate(bh);
2091 unlock_buffer(bh);
2092 reiserfs_prepare_for_journal(sb, bh, 1);
2093 journal_mark_dirty(current->journal_info, sb, bh);
2094 if (!journal_quota)
2095 reiserfs_add_ordered_list(inode, bh);
2096 brelse(bh);
2097 offset = 0;
2098 towrite -= tocopy;
2099 data += tocopy;
2100 blk++;
2101 }
2102 out:
2103 if (len == towrite)
2104 return err;
2105 if (inode->i_size < off + len - towrite)
2106 i_size_write(inode, off + len - towrite);
2107 inode->i_version++;
2108 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2109 mark_inode_dirty(inode);
2110 mutex_unlock(&inode->i_mutex);
2111 return len - towrite;
2112 }
2113
2114 #endif
2115
2116 static int get_super_block(struct file_system_type *fs_type,
2117 int flags, const char *dev_name,
2118 void *data, struct vfsmount *mnt)
2119 {
2120 return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2121 mnt);
2122 }
2123
2124 static int __init init_reiserfs_fs(void)
2125 {
2126 int ret;
2127
2128 if ((ret = init_inodecache())) {
2129 return ret;
2130 }
2131
2132 if ((ret = reiserfs_xattr_register_handlers()))
2133 goto failed_reiserfs_xattr_register_handlers;
2134
2135 reiserfs_proc_info_global_init();
2136 reiserfs_proc_register_global("version",
2137 reiserfs_global_version_in_proc);
2138
2139 ret = register_filesystem(&reiserfs_fs_type);
2140
2141 if (ret == 0) {
2142 return 0;
2143 }
2144
2145 reiserfs_xattr_unregister_handlers();
2146
2147 failed_reiserfs_xattr_register_handlers:
2148 reiserfs_proc_unregister_global("version");
2149 reiserfs_proc_info_global_done();
2150 destroy_inodecache();
2151
2152 return ret;
2153 }
2154
2155 static void __exit exit_reiserfs_fs(void)
2156 {
2157 reiserfs_xattr_unregister_handlers();
2158 reiserfs_proc_unregister_global("version");
2159 reiserfs_proc_info_global_done();
2160 unregister_filesystem(&reiserfs_fs_type);
2161 destroy_inodecache();
2162 }
2163
2164 struct file_system_type reiserfs_fs_type = {
2165 .owner = THIS_MODULE,
2166 .name = "reiserfs",
2167 .get_sb = get_super_block,
2168 .kill_sb = reiserfs_kill_sb,
2169 .fs_flags = FS_REQUIRES_DEV,
2170 };
2171
2172 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2173 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2174 MODULE_LICENSE("GPL");
2175
2176 module_init(init_reiserfs_fs);
2177 module_exit(exit_reiserfs_fs);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree