Merge commit 'v2.6.32' into reiserfs/kill-bkl
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/crc32.h>
30 #include <linux/smp_lock.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         struct reiserfs_transaction_handle th;
68
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         return 0;
77 }
78
79 static void reiserfs_write_super(struct super_block *s)
80 {
81         reiserfs_sync_fs(s, 1);
82 }
83
84 static int reiserfs_freeze(struct super_block *s)
85 {
86         struct reiserfs_transaction_handle th;
87         reiserfs_write_lock(s);
88         if (!(s->s_flags & MS_RDONLY)) {
89                 int err = journal_begin(&th, s, 1);
90                 if (err) {
91                         reiserfs_block_writes(&th);
92                 } else {
93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
94                                                      1);
95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
96                         reiserfs_block_writes(&th);
97                         journal_end_sync(&th, s, 1);
98                 }
99         }
100         s->s_dirt = 0;
101         reiserfs_write_unlock(s);
102         return 0;
103 }
104
105 static int reiserfs_unfreeze(struct super_block *s)
106 {
107         reiserfs_allow_writes(s);
108         return 0;
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, last_inode_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         memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172         /* Needed for iput() to work correctly and not trash data */
173         if (s->s_flags & MS_ACTIVE) {
174                 ms_active_set = 0;
175         } else {
176                 ms_active_set = 1;
177                 s->s_flags |= MS_ACTIVE;
178         }
179         /* Turn on quotas so that they are updated correctly */
180         for (i = 0; i < MAXQUOTAS; i++) {
181                 if (REISERFS_SB(s)->s_qf_names[i]) {
182                         int ret = reiserfs_quota_on_mount(s, i);
183                         if (ret < 0)
184                                 reiserfs_warning(s, "reiserfs-2500",
185                                                  "cannot turn on journaled "
186                                                  "quota: error %d", ret);
187                 }
188         }
189 #endif
190
191         done = 0;
192         REISERFS_SB(s)->s_is_unlinked_ok = 1;
193         while (!retval) {
194                 retval = search_item(s, &max_cpu_key, &path);
195                 if (retval != ITEM_NOT_FOUND) {
196                         reiserfs_error(s, "vs-2140",
197                                        "search_by_key returned %d", retval);
198                         break;
199                 }
200
201                 bh = get_last_bh(&path);
202                 item_pos = get_item_pos(&path);
203                 if (item_pos != B_NR_ITEMS(bh)) {
204                         reiserfs_warning(s, "vs-2060",
205                                          "wrong position found");
206                         break;
207                 }
208                 item_pos--;
209                 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212                         /* there are no "save" links anymore */
213                         break;
214
215                 save_link_key = ih->ih_key;
216                 if (is_indirect_le_ih(ih))
217                         truncate = 1;
218                 else
219                         truncate = 0;
220
221                 /* reiserfs_iget needs k_dirid and k_objectid only */
222                 item = B_I_PITEM(bh, ih);
223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224                 obj_key.on_disk_key.k_objectid =
225                     le32_to_cpu(ih->ih_key.k_objectid);
226                 obj_key.on_disk_key.k_offset = 0;
227                 obj_key.on_disk_key.k_type = 0;
228
229                 pathrelse(&path);
230
231                 inode = reiserfs_iget(s, &obj_key);
232                 if (!inode) {
233                         /* the unlink almost completed, it just did not manage to remove
234                            "save" link and release objectid */
235                         reiserfs_warning(s, "vs-2180", "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, "vs-2185",
244                                          "file %K is not unlinked",
245                                          &obj_key);
246                         retval = remove_save_link_only(s, &save_link_key, 0);
247                         continue;
248                 }
249                 vfs_dq_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, "green-2101",
257                                          "impossible truncate on a "
258                                          "directory %k. Please report",
259                                          INODE_PKEY(inode));
260                         retval = remove_save_link_only(s, &save_link_key, 0);
261                         truncate = 0;
262                         iput(inode);
263                         continue;
264                 }
265
266                 if (truncate) {
267                         REISERFS_I(inode)->i_flags |=
268                             i_link_saved_truncate_mask;
269                         /* not completed truncate found. New size was committed together
270                            with "save" link */
271                         reiserfs_info(s, "Truncating %k to %Ld ..",
272                                       INODE_PKEY(inode), inode->i_size);
273                         reiserfs_truncate_file(inode,
274                                                0
275                                                /*don't update modification time */
276                                                );
277                         retval = remove_save_link(inode, truncate);
278                 } else {
279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280                         /* not completed unlink (rmdir) found */
281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
283                                         sizeof(last_inode_key))){
284                                 last_inode_key = *INODE_PKEY(inode);
285                                 /* removal gets completed in iput */
286                                 retval = 0;
287                         } else {
288                                 reiserfs_warning(s, "super-2189", "Dead loop "
289                                                  "in finish_unfinished "
290                                                  "detected, just remove "
291                                                  "save link\n");
292                                 retval = remove_save_link_only(s,
293                                                         &save_link_key, 0);
294                         }
295                 }
296
297                 iput(inode);
298                 printk("done\n");
299                 done++;
300         }
301         REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304         /* Turn quotas off */
305         for (i = 0; i < MAXQUOTAS; i++) {
306                 if (sb_dqopt(s)->files[i])
307                         vfs_quota_off(s, i, 0);
308         }
309         if (ms_active_set)
310                 /* Restore the flag back */
311                 s->s_flags &= ~MS_ACTIVE;
312 #endif
313         pathrelse(&path);
314         if (done)
315                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316                               "Completed\n", done);
317         return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321    being unlinked. This link will be deleted in the same transaction with last
322    item of file. mounting the filesystem we scan all these links and remove
323    files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325                    struct inode *inode, int truncate)
326 {
327         INITIALIZE_PATH(path);
328         int retval;
329         struct cpu_key key;
330         struct item_head ih;
331         __le32 link;
332
333         BUG_ON(!th->t_trans_id);
334
335         /* file can only get one "save link" of each kind */
336         RFALSE(truncate &&
337                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338                "saved link already exists for truncated inode %lx",
339                (long)inode->i_ino);
340         RFALSE(!truncate &&
341                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342                "saved link already exists for unlinked inode %lx",
343                (long)inode->i_ino);
344
345         /* setup key of "save" link */
346         key.version = KEY_FORMAT_3_5;
347         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348         key.on_disk_key.k_objectid = inode->i_ino;
349         if (!truncate) {
350                 /* unlink, rmdir, rename */
351                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352                 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354                 /* item head of "safe" link */
355                 make_le_item_head(&ih, &key, key.version,
356                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357                                   4 /*length */ , 0xffff /*free space */ );
358         } else {
359                 /* truncate */
360                 if (S_ISDIR(inode->i_mode))
361                         reiserfs_warning(inode->i_sb, "green-2102",
362                                          "Adding a truncate savelink for "
363                                          "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_error(inode->i_sb, "vs-2100",
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_error(inode->i_sb, "vs-2120",
394                                        "insert_item returned %d", retval);
395         } else {
396                 if (truncate)
397                         REISERFS_I(inode)->i_flags |=
398                             i_link_saved_truncate_mask;
399                 else
400                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401         }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407         struct reiserfs_transaction_handle th;
408         struct reiserfs_key key;
409         int err;
410
411         /* we are going to do one balancing only */
412         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413         if (err)
414                 return err;
415
416         /* setup key of "save" link */
417         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418         key.k_objectid = INODE_PKEY(inode)->k_objectid;
419         if (!truncate) {
420                 /* unlink, rmdir, rename */
421                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422                                     1 + inode->i_sb->s_blocksize);
423                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424         } else {
425                 /* truncate */
426                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428         }
429
430         if ((truncate &&
431              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432             (!truncate &&
433              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434                 /* don't take quota bytes from anywhere */
435                 reiserfs_delete_solid_item(&th, NULL, &key);
436         if (!truncate) {
437                 reiserfs_release_objectid(&th, inode->i_ino);
438                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439         } else
440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447         if (REISERFS_SB(s)) {
448                 if (REISERFS_SB(s)->xattr_root) {
449                         d_invalidate(REISERFS_SB(s)->xattr_root);
450                         dput(REISERFS_SB(s)->xattr_root);
451                         REISERFS_SB(s)->xattr_root = NULL;
452                 }
453                 if (REISERFS_SB(s)->priv_root) {
454                         d_invalidate(REISERFS_SB(s)->priv_root);
455                         dput(REISERFS_SB(s)->priv_root);
456                         REISERFS_SB(s)->priv_root = NULL;
457                 }
458         }
459
460         kill_block_super(s);
461 }
462
463 static void reiserfs_put_super(struct super_block *s)
464 {
465         struct reiserfs_transaction_handle th;
466         th.t_trans_id = 0;
467
468         reiserfs_write_lock(s);
469
470         if (s->s_dirt)
471                 reiserfs_write_super(s);
472
473         /* change file system state to current state if it was mounted with read-write permissions */
474         if (!(s->s_flags & MS_RDONLY)) {
475                 if (!journal_begin(&th, s, 10)) {
476                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
477                                                      1);
478                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
479                                             REISERFS_SB(s)->s_mount_state);
480                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
481                 }
482         }
483
484         /* note, journal_release checks for readonly mount, and can decide not
485          ** to do a journal_end
486          */
487         journal_release(&th, s);
488
489         reiserfs_free_bitmap_cache(s);
490
491         brelse(SB_BUFFER_WITH_SB(s));
492
493         print_statistics(s);
494
495         if (REISERFS_SB(s)->reserved_blocks != 0) {
496                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
497                                  REISERFS_SB(s)->reserved_blocks);
498         }
499
500         reiserfs_proc_info_done(s);
501
502         reiserfs_write_unlock(s);
503         mutex_destroy(&REISERFS_SB(s)->lock);
504         kfree(s->s_fs_info);
505         s->s_fs_info = NULL;
506 }
507
508 static struct kmem_cache *reiserfs_inode_cachep;
509
510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
511 {
512         struct reiserfs_inode_info *ei;
513         ei = (struct reiserfs_inode_info *)
514             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
515         if (!ei)
516                 return NULL;
517         return &ei->vfs_inode;
518 }
519
520 static void reiserfs_destroy_inode(struct inode *inode)
521 {
522         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
523 }
524
525 static void init_once(void *foo)
526 {
527         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
528
529         INIT_LIST_HEAD(&ei->i_prealloc_list);
530         inode_init_once(&ei->vfs_inode);
531 }
532
533 static int init_inodecache(void)
534 {
535         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
536                                                   sizeof(struct
537                                                          reiserfs_inode_info),
538                                                   0, (SLAB_RECLAIM_ACCOUNT|
539                                                         SLAB_MEM_SPREAD),
540                                                   init_once);
541         if (reiserfs_inode_cachep == NULL)
542                 return -ENOMEM;
543         return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548         kmem_cache_destroy(reiserfs_inode_cachep);
549 }
550
551 /* we don't mark inodes dirty, we just log them */
552 static void reiserfs_dirty_inode(struct inode *inode)
553 {
554         struct reiserfs_transaction_handle th;
555
556         int err = 0;
557         int lock_depth;
558
559         if (inode->i_sb->s_flags & MS_RDONLY) {
560                 reiserfs_warning(inode->i_sb, "clm-6006",
561                                  "writing inode %lu on readonly FS",
562                                  inode->i_ino);
563                 return;
564         }
565         lock_depth = reiserfs_write_lock_once(inode->i_sb);
566
567         /* this is really only used for atime updates, so they don't have
568          ** to be included in O_SYNC or fsync
569          */
570         err = journal_begin(&th, inode->i_sb, 1);
571         if (err)
572                 goto out;
573
574         reiserfs_update_sd(&th, inode);
575         journal_end(&th, inode->i_sb, 1);
576
577 out:
578         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
579 }
580
581 #ifdef CONFIG_QUOTA
582 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
583                                     size_t, loff_t);
584 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
585                                    loff_t);
586 #endif
587
588 static const struct super_operations reiserfs_sops = {
589         .alloc_inode = reiserfs_alloc_inode,
590         .destroy_inode = reiserfs_destroy_inode,
591         .write_inode = reiserfs_write_inode,
592         .dirty_inode = reiserfs_dirty_inode,
593         .delete_inode = reiserfs_delete_inode,
594         .put_super = reiserfs_put_super,
595         .write_super = reiserfs_write_super,
596         .sync_fs = reiserfs_sync_fs,
597         .freeze_fs = reiserfs_freeze,
598         .unfreeze_fs = reiserfs_unfreeze,
599         .statfs = reiserfs_statfs,
600         .remount_fs = reiserfs_remount,
601         .show_options = generic_show_options,
602 #ifdef CONFIG_QUOTA
603         .quota_read = reiserfs_quota_read,
604         .quota_write = reiserfs_quota_write,
605 #endif
606 };
607
608 #ifdef CONFIG_QUOTA
609 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
610
611 static int reiserfs_write_dquot(struct dquot *);
612 static int reiserfs_acquire_dquot(struct dquot *);
613 static int reiserfs_release_dquot(struct dquot *);
614 static int reiserfs_mark_dquot_dirty(struct dquot *);
615 static int reiserfs_write_info(struct super_block *, int);
616 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
617
618 static const struct dquot_operations reiserfs_quota_operations = {
619         .initialize = dquot_initialize,
620         .drop = dquot_drop,
621         .alloc_space = dquot_alloc_space,
622         .alloc_inode = dquot_alloc_inode,
623         .free_space = dquot_free_space,
624         .free_inode = dquot_free_inode,
625         .transfer = dquot_transfer,
626         .write_dquot = reiserfs_write_dquot,
627         .acquire_dquot = reiserfs_acquire_dquot,
628         .release_dquot = reiserfs_release_dquot,
629         .mark_dirty = reiserfs_mark_dquot_dirty,
630         .write_info = reiserfs_write_info,
631         .alloc_dquot    = dquot_alloc,
632         .destroy_dquot  = dquot_destroy,
633 };
634
635 static const struct quotactl_ops reiserfs_qctl_operations = {
636         .quota_on = reiserfs_quota_on,
637         .quota_off = vfs_quota_off,
638         .quota_sync = vfs_quota_sync,
639         .get_info = vfs_get_dqinfo,
640         .set_info = vfs_set_dqinfo,
641         .get_dqblk = vfs_get_dqblk,
642         .set_dqblk = vfs_set_dqblk,
643 };
644 #endif
645
646 static const struct export_operations reiserfs_export_ops = {
647         .encode_fh = reiserfs_encode_fh,
648         .fh_to_dentry = reiserfs_fh_to_dentry,
649         .fh_to_parent = reiserfs_fh_to_parent,
650         .get_parent = reiserfs_get_parent,
651 };
652
653 /* this struct is used in reiserfs_getopt () for containing the value for those
654    mount options that have values rather than being toggles. */
655 typedef struct {
656         char *value;
657         int setmask;            /* bitmask which is to set on mount_options bitmask when this
658                                    value is found, 0 is no bits are to be changed. */
659         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
660                                    value is found, 0 is no bits are to be changed. This is
661                                    applied BEFORE setmask */
662 } arg_desc_t;
663
664 /* Set this bit in arg_required to allow empty arguments */
665 #define REISERFS_OPT_ALLOWEMPTY 31
666
667 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
668    mount options */
669 typedef struct {
670         char *option_name;
671         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
672         const arg_desc_t *values;       /* list of values accepted by an option */
673         int setmask;            /* bitmask which is to set on mount_options bitmask when this
674                                    value is found, 0 is no bits are to be changed. */
675         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
676                                    value is found, 0 is no bits are to be changed. This is
677                                    applied BEFORE setmask */
678 } opt_desc_t;
679
680 /* possible values for -o data= */
681 static const arg_desc_t logging_mode[] = {
682         {"ordered", 1 << REISERFS_DATA_ORDERED,
683          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
684         {"journal", 1 << REISERFS_DATA_LOG,
685          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
686         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
687          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
688         {.value = NULL}
689 };
690
691 /* possible values for -o barrier= */
692 static const arg_desc_t barrier_mode[] = {
693         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
694         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
695         {.value = NULL}
696 };
697
698 /* possible values for "-o block-allocator=" and bits which are to be set in
699    s_mount_opt of reiserfs specific part of in-core super block */
700 static const arg_desc_t balloc[] = {
701         {"noborder", 1 << REISERFS_NO_BORDER, 0},
702         {"border", 0, 1 << REISERFS_NO_BORDER},
703         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
704         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
705         {"test4", 1 << REISERFS_TEST4, 0},
706         {"notest4", 0, 1 << REISERFS_TEST4},
707         {NULL, 0, 0}
708 };
709
710 static const arg_desc_t tails[] = {
711         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
712         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
713         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
714         {NULL, 0, 0}
715 };
716
717 static const arg_desc_t error_actions[] = {
718         {"panic", 1 << REISERFS_ERROR_PANIC,
719          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
720         {"ro-remount", 1 << REISERFS_ERROR_RO,
721          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
722 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
723         {"continue", 1 << REISERFS_ERROR_CONTINUE,
724          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
725 #endif
726         {NULL, 0, 0},
727 };
728
729 /* proceed only one option from a list *cur - string containing of mount options
730    opts - array of options which are accepted
731    opt_arg - if option is found and requires an argument and if it is specifed
732    in the input - pointer to the argument is stored here
733    bit_flags - if option requires to set a certain bit - it is set here
734    return -1 if unknown option is found, opt->arg_required otherwise */
735 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
736                            char **opt_arg, unsigned long *bit_flags)
737 {
738         char *p;
739         /* foo=bar,
740            ^   ^  ^
741            |   |  +-- option_end
742            |   +-- arg_start
743            +-- option_start
744          */
745         const opt_desc_t *opt;
746         const arg_desc_t *arg;
747
748         p = *cur;
749
750         /* assume argument cannot contain commas */
751         *cur = strchr(p, ',');
752         if (*cur) {
753                 *(*cur) = '\0';
754                 (*cur)++;
755         }
756
757         if (!strncmp(p, "alloc=", 6)) {
758                 /* Ugly special case, probably we should redo options parser so that
759                    it can understand several arguments for some options, also so that
760                    it can fill several bitfields with option values. */
761                 if (reiserfs_parse_alloc_options(s, p + 6)) {
762                         return -1;
763                 } else {
764                         return 0;
765                 }
766         }
767
768         /* for every option in the list */
769         for (opt = opts; opt->option_name; opt++) {
770                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
771                         if (bit_flags) {
772                                 if (opt->clrmask ==
773                                     (1 << REISERFS_UNSUPPORTED_OPT))
774                                         reiserfs_warning(s, "super-6500",
775                                                          "%s not supported.\n",
776                                                          p);
777                                 else
778                                         *bit_flags &= ~opt->clrmask;
779                                 if (opt->setmask ==
780                                     (1 << REISERFS_UNSUPPORTED_OPT))
781                                         reiserfs_warning(s, "super-6501",
782                                                          "%s not supported.\n",
783                                                          p);
784                                 else
785                                         *bit_flags |= opt->setmask;
786                         }
787                         break;
788                 }
789         }
790         if (!opt->option_name) {
791                 reiserfs_warning(s, "super-6502",
792                                  "unknown mount option \"%s\"", p);
793                 return -1;
794         }
795
796         p += strlen(opt->option_name);
797         switch (*p) {
798         case '=':
799                 if (!opt->arg_required) {
800                         reiserfs_warning(s, "super-6503",
801                                          "the option \"%s\" does not "
802                                          "require an argument\n",
803                                          opt->option_name);
804                         return -1;
805                 }
806                 break;
807
808         case 0:
809                 if (opt->arg_required) {
810                         reiserfs_warning(s, "super-6504",
811                                          "the option \"%s\" requires an "
812                                          "argument\n", opt->option_name);
813                         return -1;
814                 }
815                 break;
816         default:
817                 reiserfs_warning(s, "super-6505",
818                                  "head of option \"%s\" is only correct\n",
819                                  opt->option_name);
820                 return -1;
821         }
822
823         /* move to the argument, or to next option if argument is not required */
824         p++;
825
826         if (opt->arg_required
827             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828             && !strlen(p)) {
829                 /* this catches "option=," if not allowed */
830                 reiserfs_warning(s, "super-6506",
831                                  "empty argument for \"%s\"\n",
832                                  opt->option_name);
833                 return -1;
834         }
835
836         if (!opt->values) {
837                 /* *=NULLopt_arg contains pointer to argument */
838                 *opt_arg = p;
839                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840         }
841
842         /* values possible for this option are listed in opt->values */
843         for (arg = opt->values; arg->value; arg++) {
844                 if (!strcmp(p, arg->value)) {
845                         if (bit_flags) {
846                                 *bit_flags &= ~arg->clrmask;
847                                 *bit_flags |= arg->setmask;
848                         }
849                         return opt->arg_required;
850                 }
851         }
852
853         reiserfs_warning(s, "super-6506",
854                          "bad value \"%s\" for option \"%s\"\n", p,
855                          opt->option_name);
856         return -1;
857 }
858
859 /* returns 0 if something is wrong in option string, 1 - otherwise */
860 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
861                                   unsigned long *mount_options,
862                                   /* after the parsing phase, contains the
863                                      collection of bitflags defining what
864                                      mount options were selected. */
865                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
866                                   char **jdev_name,
867                                   unsigned int *commit_max_age,
868                                   char **qf_names,
869                                   unsigned int *qfmt)
870 {
871         int c;
872         char *arg = NULL;
873         char *pos;
874         opt_desc_t opts[] = {
875                 /* Compatibility stuff, so that -o notail for old setups still work */
876                 {"tails",.arg_required = 't',.values = tails},
877                 {"notail",.clrmask =
878                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
879                 {"conv",.setmask = 1 << REISERFS_CONVERT},
880                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
881                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
882                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
883 #ifdef CONFIG_REISERFS_FS_XATTR
884                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
885                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
886 #else
887                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
888                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
889 #endif
890 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
891                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
892                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
893 #else
894                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
895                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
896 #endif
897                 {.option_name = "nolog"},
898                 {"replayonly",.setmask = 1 << REPLAYONLY},
899                 {"block-allocator",.arg_required = 'a',.values = balloc},
900                 {"data",.arg_required = 'd',.values = logging_mode},
901                 {"barrier",.arg_required = 'b',.values = barrier_mode},
902                 {"resize",.arg_required = 'r',.values = NULL},
903                 {"jdev",.arg_required = 'j',.values = NULL},
904                 {"nolargeio",.arg_required = 'w',.values = NULL},
905                 {"commit",.arg_required = 'c',.values = NULL},
906                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
907                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
908                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
909                 {"errors",.arg_required = 'e',.values = error_actions},
910                 {"usrjquota",.arg_required =
911                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912                 {"grpjquota",.arg_required =
913                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
914                 {"jqfmt",.arg_required = 'f',.values = NULL},
915                 {.option_name = NULL}
916         };
917
918         *blocks = 0;
919         if (!options || !*options)
920                 /* use default configuration: create tails, journaling on, no
921                    conversion to newest format */
922                 return 1;
923
924         for (pos = options; pos;) {
925                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
926                 if (c == -1)
927                         /* wrong option is given */
928                         return 0;
929
930                 if (c == 'r') {
931                         char *p;
932
933                         p = NULL;
934                         /* "resize=NNN" or "resize=auto" */
935
936                         if (!strcmp(arg, "auto")) {
937                                 /* From JFS code, to auto-get the size. */
938                                 *blocks =
939                                     s->s_bdev->bd_inode->i_size >> s->
940                                     s_blocksize_bits;
941                         } else {
942                                 *blocks = simple_strtoul(arg, &p, 0);
943                                 if (*p != '\0') {
944                                         /* NNN does not look like a number */
945                                         reiserfs_warning(s, "super-6507",
946                                                          "bad value %s for "
947                                                          "-oresize\n", arg);
948                                         return 0;
949                                 }
950                         }
951                 }
952
953                 if (c == 'c') {
954                         char *p = NULL;
955                         unsigned long val = simple_strtoul(arg, &p, 0);
956                         /* commit=NNN (time in seconds) */
957                         if (*p != '\0' || val >= (unsigned int)-1) {
958                                 reiserfs_warning(s, "super-6508",
959                                                  "bad value %s for -ocommit\n",
960                                                  arg);
961                                 return 0;
962                         }
963                         *commit_max_age = (unsigned int)val;
964                 }
965
966                 if (c == 'w') {
967                         reiserfs_warning(s, "super-6509", "nolargeio option "
968                                          "is no longer supported");
969                         return 0;
970                 }
971
972                 if (c == 'j') {
973                         if (arg && *arg && jdev_name) {
974                                 if (*jdev_name) {       //Hm, already assigned?
975                                         reiserfs_warning(s, "super-6510",
976                                                          "journal device was "
977                                                          "already specified to "
978                                                          "be %s", *jdev_name);
979                                         return 0;
980                                 }
981                                 *jdev_name = arg;
982                         }
983                 }
984 #ifdef CONFIG_QUOTA
985                 if (c == 'u' || c == 'g') {
986                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
987
988                         if (sb_any_quota_loaded(s) &&
989                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
990                                 reiserfs_warning(s, "super-6511",
991                                                  "cannot change journaled "
992                                                  "quota options when quota "
993                                                  "turned on.");
994                                 return 0;
995                         }
996                         if (*arg) {     /* Some filename specified? */
997                                 if (REISERFS_SB(s)->s_qf_names[qtype]
998                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
999                                               arg)) {
1000                                         reiserfs_warning(s, "super-6512",
1001                                                          "%s quota file "
1002                                                          "already specified.",
1003                                                          QTYPE2NAME(qtype));
1004                                         return 0;
1005                                 }
1006                                 if (strchr(arg, '/')) {
1007                                         reiserfs_warning(s, "super-6513",
1008                                                          "quotafile must be "
1009                                                          "on filesystem root.");
1010                                         return 0;
1011                                 }
1012                                 qf_names[qtype] =
1013                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1014                                 if (!qf_names[qtype]) {
1015                                         reiserfs_warning(s, "reiserfs-2502",
1016                                                          "not enough memory "
1017                                                          "for storing "
1018                                                          "quotafile name.");
1019                                         return 0;
1020                                 }
1021                                 strcpy(qf_names[qtype], arg);
1022                                 *mount_options |= 1 << REISERFS_QUOTA;
1023                         } else {
1024                                 if (qf_names[qtype] !=
1025                                     REISERFS_SB(s)->s_qf_names[qtype])
1026                                         kfree(qf_names[qtype]);
1027                                 qf_names[qtype] = NULL;
1028                         }
1029                 }
1030                 if (c == 'f') {
1031                         if (!strcmp(arg, "vfsold"))
1032                                 *qfmt = QFMT_VFS_OLD;
1033                         else if (!strcmp(arg, "vfsv0"))
1034                                 *qfmt = QFMT_VFS_V0;
1035                         else {
1036                                 reiserfs_warning(s, "super-6514",
1037                                                  "unknown quota format "
1038                                                  "specified.");
1039                                 return 0;
1040                         }
1041                         if (sb_any_quota_loaded(s) &&
1042                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1043                                 reiserfs_warning(s, "super-6515",
1044                                                  "cannot change journaled "
1045                                                  "quota options when quota "
1046                                                  "turned on.");
1047                                 return 0;
1048                         }
1049                 }
1050 #else
1051                 if (c == 'u' || c == 'g' || c == 'f') {
1052                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1053                                          "quota options not supported.");
1054                         return 0;
1055                 }
1056 #endif
1057         }
1058
1059 #ifdef CONFIG_QUOTA
1060         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1061             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1062                 reiserfs_warning(s, "super-6515",
1063                                  "journaled quota format not specified.");
1064                 return 0;
1065         }
1066         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1067         if (!(*mount_options & (1 << REISERFS_QUOTA))
1068             && sb_any_quota_loaded(s)) {
1069                 reiserfs_warning(s, "super-6516", "quota options must "
1070                                  "be present when quota is turned on.");
1071                 return 0;
1072         }
1073 #endif
1074
1075         return 1;
1076 }
1077
1078 static void switch_data_mode(struct super_block *s, unsigned long mode)
1079 {
1080         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1081                                          (1 << REISERFS_DATA_ORDERED) |
1082                                          (1 << REISERFS_DATA_WRITEBACK));
1083         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1084 }
1085
1086 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1087 {
1088         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1089                 if (!reiserfs_data_log(s)) {
1090                         switch_data_mode(s, REISERFS_DATA_LOG);
1091                         reiserfs_info(s, "switching to journaled data mode\n");
1092                 }
1093         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1094                 if (!reiserfs_data_ordered(s)) {
1095                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1096                         reiserfs_info(s, "switching to ordered data mode\n");
1097                 }
1098         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1099                 if (!reiserfs_data_writeback(s)) {
1100                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1101                         reiserfs_info(s, "switching to writeback data mode\n");
1102                 }
1103         }
1104 }
1105
1106 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1107 {
1108         int flush = (1 << REISERFS_BARRIER_FLUSH);
1109         int none = (1 << REISERFS_BARRIER_NONE);
1110         int all_barrier = flush | none;
1111
1112         if (bits & all_barrier) {
1113                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1114                 if (bits & flush) {
1115                         REISERFS_SB(s)->s_mount_opt |= flush;
1116                         printk("reiserfs: enabling write barrier flush mode\n");
1117                 } else if (bits & none) {
1118                         REISERFS_SB(s)->s_mount_opt |= none;
1119                         printk("reiserfs: write barriers turned off\n");
1120                 }
1121         }
1122 }
1123
1124 static void handle_attrs(struct super_block *s)
1125 {
1126         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1127
1128         if (reiserfs_attrs(s)) {
1129                 if (old_format_only(s)) {
1130                         reiserfs_warning(s, "super-6517", "cannot support "
1131                                          "attributes on 3.5.x disk format");
1132                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1133                         return;
1134                 }
1135                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1136                         reiserfs_warning(s, "super-6518", "cannot support "
1137                                          "attributes until flag is set in "
1138                                          "super-block");
1139                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1140                 }
1141         }
1142 }
1143
1144 #ifdef CONFIG_QUOTA
1145 static void handle_quota_files(struct super_block *s, char **qf_names,
1146                                unsigned int *qfmt)
1147 {
1148         int i;
1149
1150         for (i = 0; i < MAXQUOTAS; i++) {
1151                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1152                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1153                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1154         }
1155         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1156 }
1157 #endif
1158
1159 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1160 {
1161         struct reiserfs_super_block *rs;
1162         struct reiserfs_transaction_handle th;
1163         unsigned long blocks;
1164         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1165         unsigned long safe_mask = 0;
1166         unsigned int commit_max_age = (unsigned int)-1;
1167         struct reiserfs_journal *journal = SB_JOURNAL(s);
1168         char *new_opts = kstrdup(arg, GFP_KERNEL);
1169         int err;
1170         char *qf_names[MAXQUOTAS];
1171         unsigned int qfmt = 0;
1172 #ifdef CONFIG_QUOTA
1173         int i;
1174 #endif
1175
1176         reiserfs_write_lock(s);
1177
1178 #ifdef CONFIG_QUOTA
1179         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1180 #endif
1181
1182         rs = SB_DISK_SUPER_BLOCK(s);
1183
1184         if (!reiserfs_parse_options
1185             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1186             qf_names, &qfmt)) {
1187 #ifdef CONFIG_QUOTA
1188                 for (i = 0; i < MAXQUOTAS; i++)
1189                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1190                                 kfree(qf_names[i]);
1191 #endif
1192                 err = -EINVAL;
1193                 goto out_err;
1194         }
1195 #ifdef CONFIG_QUOTA
1196         handle_quota_files(s, qf_names, &qfmt);
1197 #endif
1198
1199         handle_attrs(s);
1200
1201         /* Add options that are safe here */
1202         safe_mask |= 1 << REISERFS_SMALLTAIL;
1203         safe_mask |= 1 << REISERFS_LARGETAIL;
1204         safe_mask |= 1 << REISERFS_NO_BORDER;
1205         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1206         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1207         safe_mask |= 1 << REISERFS_TEST4;
1208         safe_mask |= 1 << REISERFS_ATTRS;
1209         safe_mask |= 1 << REISERFS_XATTRS_USER;
1210         safe_mask |= 1 << REISERFS_POSIXACL;
1211         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1212         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1213         safe_mask |= 1 << REISERFS_ERROR_RO;
1214         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1215         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1216         safe_mask |= 1 << REISERFS_QUOTA;
1217
1218         /* Update the bitmask, taking care to keep
1219          * the bits we're not allowed to change here */
1220         REISERFS_SB(s)->s_mount_opt =
1221             (REISERFS_SB(s)->
1222              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1223
1224         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1225                 journal->j_max_commit_age = commit_max_age;
1226                 journal->j_max_trans_age = commit_max_age;
1227         } else if (commit_max_age == 0) {
1228                 /* 0 means restore defaults. */
1229                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1230                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1231         }
1232
1233         if (blocks) {
1234                 err = reiserfs_resize(s, blocks);
1235                 if (err != 0)
1236                         goto out_err;
1237         }
1238
1239         if (*mount_flags & MS_RDONLY) {
1240                 reiserfs_xattr_init(s, *mount_flags);
1241                 /* remount read-only */
1242                 if (s->s_flags & MS_RDONLY)
1243                         /* it is read-only already */
1244                         goto out_ok;
1245                 /* try to remount file system with read-only permissions */
1246                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1247                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1248                         goto out_ok;
1249                 }
1250
1251                 err = journal_begin(&th, s, 10);
1252                 if (err)
1253                         goto out_err;
1254
1255                 /* Mounting a rw partition read-only. */
1256                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1257                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1258                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1259         } else {
1260                 /* remount read-write */
1261                 if (!(s->s_flags & MS_RDONLY)) {
1262                         reiserfs_xattr_init(s, *mount_flags);
1263                         goto out_ok;    /* We are read-write already */
1264                 }
1265
1266                 if (reiserfs_is_journal_aborted(journal)) {
1267                         err = journal->j_errno;
1268                         goto out_err;
1269                 }
1270
1271                 handle_data_mode(s, mount_options);
1272                 handle_barrier_mode(s, mount_options);
1273                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1274                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1275                 err = journal_begin(&th, s, 10);
1276                 if (err)
1277                         goto out_err;
1278
1279                 /* Mount a partition which is read-only, read-write */
1280                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1281                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1282                 s->s_flags &= ~MS_RDONLY;
1283                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1284                 if (!old_format_only(s))
1285                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1286                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1287                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1288                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1289         }
1290         /* this will force a full flush of all journal lists */
1291         SB_JOURNAL(s)->j_must_wait = 1;
1292         err = journal_end(&th, s, 10);
1293         if (err)
1294                 goto out_err;
1295         s->s_dirt = 0;
1296
1297         if (!(*mount_flags & MS_RDONLY)) {
1298                 finish_unfinished(s);
1299                 reiserfs_xattr_init(s, *mount_flags);
1300         }
1301
1302 out_ok:
1303         replace_mount_options(s, new_opts);
1304         reiserfs_write_unlock(s);
1305         return 0;
1306
1307 out_err:
1308         kfree(new_opts);
1309         reiserfs_write_unlock(s);
1310         return err;
1311 }
1312
1313 static int read_super_block(struct super_block *s, int offset)
1314 {
1315         struct buffer_head *bh;
1316         struct reiserfs_super_block *rs;
1317         int fs_blocksize;
1318
1319         bh = sb_bread(s, offset / s->s_blocksize);
1320         if (!bh) {
1321                 reiserfs_warning(s, "sh-2006",
1322                                  "bread failed (dev %s, block %lu, size %lu)",
1323                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1324                                  s->s_blocksize);
1325                 return 1;
1326         }
1327
1328         rs = (struct reiserfs_super_block *)bh->b_data;
1329         if (!is_any_reiserfs_magic_string(rs)) {
1330                 brelse(bh);
1331                 return 1;
1332         }
1333         //
1334         // ok, reiserfs signature (old or new) found in at the given offset
1335         //
1336         fs_blocksize = sb_blocksize(rs);
1337         brelse(bh);
1338         sb_set_blocksize(s, fs_blocksize);
1339
1340         bh = sb_bread(s, offset / s->s_blocksize);
1341         if (!bh) {
1342                 reiserfs_warning(s, "sh-2007",
1343                                  "bread failed (dev %s, block %lu, size %lu)",
1344                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1345                                  s->s_blocksize);
1346                 return 1;
1347         }
1348
1349         rs = (struct reiserfs_super_block *)bh->b_data;
1350         if (sb_blocksize(rs) != s->s_blocksize) {
1351                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1352                                  "filesystem on (dev %s, block %Lu, size %lu)",
1353                                  reiserfs_bdevname(s),
1354                                  (unsigned long long)bh->b_blocknr,
1355                                  s->s_blocksize);
1356                 brelse(bh);
1357                 return 1;
1358         }
1359
1360         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1361                 brelse(bh);
1362                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1363                                  "--rebuild-tree run detected. Please run\n"
1364                                  "reiserfsck --rebuild-tree and wait for a "
1365                                  "completion. If that fails\n"
1366                                  "get newer reiserfsprogs package");
1367                 return 1;
1368         }
1369
1370         SB_BUFFER_WITH_SB(s) = bh;
1371         SB_DISK_SUPER_BLOCK(s) = rs;
1372
1373         if (is_reiserfs_jr(rs)) {
1374                 /* magic is of non-standard journal filesystem, look at s_version to
1375                    find which format is in use */
1376                 if (sb_version(rs) == REISERFS_VERSION_2)
1377                         reiserfs_info(s, "found reiserfs format \"3.6\""
1378                                       " with non-standard journal\n");
1379                 else if (sb_version(rs) == REISERFS_VERSION_1)
1380                         reiserfs_info(s, "found reiserfs format \"3.5\""
1381                                       " with non-standard journal\n");
1382                 else {
1383                         reiserfs_warning(s, "sh-2012", "found unknown "
1384                                          "format \"%u\" of reiserfs with "
1385                                          "non-standard magic", sb_version(rs));
1386                         return 1;
1387                 }
1388         } else
1389                 /* s_version of standard format may contain incorrect information,
1390                    so we just look at the magic string */
1391                 reiserfs_info(s,
1392                               "found reiserfs format \"%s\" with standard journal\n",
1393                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1394
1395         s->s_op = &reiserfs_sops;
1396         s->s_export_op = &reiserfs_export_ops;
1397 #ifdef CONFIG_QUOTA
1398         s->s_qcop = &reiserfs_qctl_operations;
1399         s->dq_op = &reiserfs_quota_operations;
1400 #endif
1401
1402         /* new format is limited by the 32 bit wide i_blocks field, want to
1403          ** be one full block below that.
1404          */
1405         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1406         return 0;
1407 }
1408
1409 /* after journal replay, reread all bitmap and super blocks */
1410 static int reread_meta_blocks(struct super_block *s)
1411 {
1412         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1413         reiserfs_write_unlock(s);
1414         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1415         reiserfs_write_lock(s);
1416         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1417                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1418                 return 1;
1419         }
1420
1421         return 0;
1422 }
1423
1424 /////////////////////////////////////////////////////
1425 // hash detection stuff
1426
1427 // if root directory is empty - we set default - Yura's - hash and
1428 // warn about it
1429 // FIXME: we look for only one name in a directory. If tea and yura
1430 // bith have the same value - we ask user to send report to the
1431 // mailing list
1432 static __u32 find_hash_out(struct super_block *s)
1433 {
1434         int retval;
1435         struct inode *inode;
1436         struct cpu_key key;
1437         INITIALIZE_PATH(path);
1438         struct reiserfs_dir_entry de;
1439         __u32 hash = DEFAULT_HASH;
1440
1441         inode = s->s_root->d_inode;
1442
1443         do {                    // Some serious "goto"-hater was there ;)
1444                 u32 teahash, r5hash, yurahash;
1445
1446                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1447                 retval = search_by_entry_key(s, &key, &path, &de);
1448                 if (retval == IO_ERROR) {
1449                         pathrelse(&path);
1450                         return UNSET_HASH;
1451                 }
1452                 if (retval == NAME_NOT_FOUND)
1453                         de.de_entry_num--;
1454                 set_de_name_and_namelen(&de);
1455                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1456                         /* allow override in this case */
1457                         if (reiserfs_rupasov_hash(s)) {
1458                                 hash = YURA_HASH;
1459                         }
1460                         reiserfs_info(s, "FS seems to be empty, autodetect "
1461                                          "is using the default hash\n");
1462                         break;
1463                 }
1464                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1465                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1466                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1467                 if (((teahash == r5hash)
1468                      &&
1469                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1470                       == r5hash)) || ((teahash == yurahash)
1471                                       && (yurahash ==
1472                                           GET_HASH_VALUE(deh_offset
1473                                                          (&
1474                                                           (de.
1475                                                            de_deh[de.
1476                                                                   de_entry_num])))))
1477                     || ((r5hash == yurahash)
1478                         && (yurahash ==
1479                             GET_HASH_VALUE(deh_offset
1480                                            (&(de.de_deh[de.de_entry_num])))))) {
1481                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1482                                          "automatically detect hash function. "
1483                                          "Please mount with -o "
1484                                          "hash={tea,rupasov,r5}");
1485                         hash = UNSET_HASH;
1486                         break;
1487                 }
1488                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1489                     yurahash)
1490                         hash = YURA_HASH;
1491                 else if (GET_HASH_VALUE
1492                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1493                         hash = TEA_HASH;
1494                 else if (GET_HASH_VALUE
1495                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1496                         hash = R5_HASH;
1497                 else {
1498                         reiserfs_warning(s, "reiserfs-2506",
1499                                          "Unrecognised hash function");
1500                         hash = UNSET_HASH;
1501                 }
1502         } while (0);
1503
1504         pathrelse(&path);
1505         return hash;
1506 }
1507
1508 // finds out which hash names are sorted with
1509 static int what_hash(struct super_block *s)
1510 {
1511         __u32 code;
1512
1513         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1514
1515         /* reiserfs_hash_detect() == true if any of the hash mount options
1516          ** were used.  We must check them to make sure the user isn't
1517          ** using a bad hash value
1518          */
1519         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1520                 code = find_hash_out(s);
1521
1522         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1523                 /* detection has found the hash, and we must check against the
1524                  ** mount options
1525                  */
1526                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1527                         reiserfs_warning(s, "reiserfs-2507",
1528                                          "Error, %s hash detected, "
1529                                          "unable to force rupasov hash",
1530                                          reiserfs_hashname(code));
1531                         code = UNSET_HASH;
1532                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1533                         reiserfs_warning(s, "reiserfs-2508",
1534                                          "Error, %s hash detected, "
1535                                          "unable to force tea hash",
1536                                          reiserfs_hashname(code));
1537                         code = UNSET_HASH;
1538                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1539                         reiserfs_warning(s, "reiserfs-2509",
1540                                          "Error, %s hash detected, "
1541                                          "unable to force r5 hash",
1542                                          reiserfs_hashname(code));
1543                         code = UNSET_HASH;
1544                 }
1545         } else {
1546                 /* find_hash_out was not called or could not determine the hash */
1547                 if (reiserfs_rupasov_hash(s)) {
1548                         code = YURA_HASH;
1549                 } else if (reiserfs_tea_hash(s)) {
1550                         code = TEA_HASH;
1551                 } else if (reiserfs_r5_hash(s)) {
1552                         code = R5_HASH;
1553                 }
1554         }
1555
1556         /* if we are mounted RW, and we have a new valid hash code, update
1557          ** the super
1558          */
1559         if (code != UNSET_HASH &&
1560             !(s->s_flags & MS_RDONLY) &&
1561             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1562                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1563         }
1564         return code;
1565 }
1566
1567 // return pointer to appropriate function
1568 static hashf_t hash_function(struct super_block *s)
1569 {
1570         switch (what_hash(s)) {
1571         case TEA_HASH:
1572                 reiserfs_info(s, "Using tea hash to sort names\n");
1573                 return keyed_hash;
1574         case YURA_HASH:
1575                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1576                 return yura_hash;
1577         case R5_HASH:
1578                 reiserfs_info(s, "Using r5 hash to sort names\n");
1579                 return r5_hash;
1580         }
1581         return NULL;
1582 }
1583
1584 // this is used to set up correct value for old partitions
1585 static int function2code(hashf_t func)
1586 {
1587         if (func == keyed_hash)
1588                 return TEA_HASH;
1589         if (func == yura_hash)
1590                 return YURA_HASH;
1591         if (func == r5_hash)
1592                 return R5_HASH;
1593
1594         BUG();                  // should never happen
1595
1596         return 0;
1597 }
1598
1599 #define SWARN(silent, s, id, ...)                       \
1600         if (!(silent))                          \
1601                 reiserfs_warning(s, id, __VA_ARGS__)
1602
1603 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1604 {
1605         struct inode *root_inode;
1606         struct reiserfs_transaction_handle th;
1607         int old_format = 0;
1608         unsigned long blocks;
1609         unsigned int commit_max_age = 0;
1610         int jinit_done = 0;
1611         struct reiserfs_iget_args args;
1612         struct reiserfs_super_block *rs;
1613         char *jdev_name;
1614         struct reiserfs_sb_info *sbi;
1615         int errval = -EINVAL;
1616         char *qf_names[MAXQUOTAS] = {};
1617         unsigned int qfmt = 0;
1618
1619         save_mount_options(s, data);
1620
1621         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1622         if (!sbi) {
1623                 errval = -ENOMEM;
1624                 goto error_alloc;
1625         }
1626         s->s_fs_info = sbi;
1627         /* Set default values for options: non-aggressive tails, RO on errors */
1628         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1629         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1630         /* no preallocation minimum, be smart in
1631            reiserfs_file_write instead */
1632         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1633         /* Preallocate by 16 blocks (17-1) at once */
1634         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1635         /* setup default block allocator options */
1636         reiserfs_init_alloc_options(s);
1637
1638         mutex_init(&REISERFS_SB(s)->lock);
1639         REISERFS_SB(s)->lock_depth = -1;
1640
1641         /*
1642          * This function is called with the bkl, which also was the old
1643          * locking used here.
1644          * do_journal_begin() will soon check if we hold the lock (ie: was the
1645          * bkl). This is likely because do_journal_begin() has several another
1646          * callers because at this time, it doesn't seem to be necessary to
1647          * protect against anything.
1648          * Anyway, let's be conservative and lock for now.
1649          */
1650         reiserfs_write_lock(s);
1651
1652         jdev_name = NULL;
1653         if (reiserfs_parse_options
1654             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1655              &commit_max_age, qf_names, &qfmt) == 0) {
1656                 goto error;
1657         }
1658 #ifdef CONFIG_QUOTA
1659         handle_quota_files(s, qf_names, &qfmt);
1660 #endif
1661
1662         if (blocks) {
1663                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1664                 goto error;
1665         }
1666
1667         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1668         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1669                 old_format = 1;
1670         /* try new format (64-th 1k block), which can contain reiserfs super block */
1671         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1672                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1673                       reiserfs_bdevname(s));
1674                 goto error;
1675         }
1676
1677         rs = SB_DISK_SUPER_BLOCK(s);
1678         /* Let's do basic sanity check to verify that underlying device is not
1679            smaller than the filesystem. If the check fails then abort and scream,
1680            because bad stuff will happen otherwise. */
1681         if (s->s_bdev && s->s_bdev->bd_inode
1682             && i_size_read(s->s_bdev->bd_inode) <
1683             sb_block_count(rs) * sb_blocksize(rs)) {
1684                 SWARN(silent, s, "", "Filesystem cannot be "
1685                       "mounted because it is bigger than the device");
1686                 SWARN(silent, s, "", "You may need to run fsck "
1687                       "or increase size of your LVM partition");
1688                 SWARN(silent, s, "", "Or may be you forgot to "
1689                       "reboot after fdisk when it told you to");
1690                 goto error;
1691         }
1692
1693         sbi->s_mount_state = SB_REISERFS_STATE(s);
1694         sbi->s_mount_state = REISERFS_VALID_FS;
1695
1696         if ((errval = reiserfs_init_bitmap_cache(s))) {
1697                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1698                 goto error;
1699         }
1700         errval = -EINVAL;
1701 #ifdef CONFIG_REISERFS_CHECK
1702         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1703         SWARN(silent, s, "", "- it is slow mode for debugging.");
1704 #endif
1705
1706         /* make data=ordered the default */
1707         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1708             !reiserfs_data_writeback(s)) {
1709                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1710         }
1711
1712         if (reiserfs_data_log(s)) {
1713                 reiserfs_info(s, "using journaled data mode\n");
1714         } else if (reiserfs_data_ordered(s)) {
1715                 reiserfs_info(s, "using ordered data mode\n");
1716         } else {
1717                 reiserfs_info(s, "using writeback data mode\n");
1718         }
1719         if (reiserfs_barrier_flush(s)) {
1720                 printk("reiserfs: using flush barriers\n");
1721         }
1722         // set_device_ro(s->s_dev, 1) ;
1723         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1724                 SWARN(silent, s, "sh-2022",
1725                       "unable to initialize journal space");
1726                 goto error;
1727         } else {
1728                 jinit_done = 1; /* once this is set, journal_release must be called
1729                                  ** if we error out of the mount
1730                                  */
1731         }
1732         if (reread_meta_blocks(s)) {
1733                 SWARN(silent, s, "jmacd-9",
1734                       "unable to reread meta blocks after journal init");
1735                 goto error;
1736         }
1737
1738         if (replay_only(s))
1739                 goto error;
1740
1741         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1742                 SWARN(silent, s, "clm-7000",
1743                       "Detected readonly device, marking FS readonly");
1744                 s->s_flags |= MS_RDONLY;
1745         }
1746         args.objectid = REISERFS_ROOT_OBJECTID;
1747         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1748         root_inode =
1749             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1750                          reiserfs_init_locked_inode, (void *)(&args));
1751         if (!root_inode) {
1752                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1753                 goto error;
1754         }
1755
1756         if (root_inode->i_state & I_NEW) {
1757                 reiserfs_read_locked_inode(root_inode, &args);
1758                 unlock_new_inode(root_inode);
1759         }
1760
1761         s->s_root = d_alloc_root(root_inode);
1762         if (!s->s_root) {
1763                 iput(root_inode);
1764                 goto error;
1765         }
1766         // define and initialize hash function
1767         sbi->s_hash_function = hash_function(s);
1768         if (sbi->s_hash_function == NULL) {
1769                 dput(s->s_root);
1770                 s->s_root = NULL;
1771                 goto error;
1772         }
1773
1774         if (is_reiserfs_3_5(rs)
1775             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1776                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1777         else if (old_format)
1778                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1779         else
1780                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1781
1782         if (!(s->s_flags & MS_RDONLY)) {
1783
1784                 errval = journal_begin(&th, s, 1);
1785                 if (errval) {
1786                         dput(s->s_root);
1787                         s->s_root = NULL;
1788                         goto error;
1789                 }
1790                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1791
1792                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1793                 set_sb_fs_state(rs, 0);
1794
1795                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1796                  * case, but older revisions can't. This will cause the
1797                  * file system to fail mount on those older implementations,
1798                  * avoiding corruption. -jeffm */
1799                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1800                     sb_bmap_nr(rs) != 0) {
1801                         reiserfs_warning(s, "super-2030", "This file system "
1802                                         "claims to use %u bitmap blocks in "
1803                                         "its super block, but requires %u. "
1804                                         "Clearing to zero.", sb_bmap_nr(rs),
1805                                         reiserfs_bmap_count(s));
1806
1807                         set_sb_bmap_nr(rs, 0);
1808                 }
1809
1810                 if (old_format_only(s)) {
1811                         /* filesystem of format 3.5 either with standard or non-standard
1812                            journal */
1813                         if (convert_reiserfs(s)) {
1814                                 /* and -o conv is given */
1815                                 if (!silent)
1816                                         reiserfs_info(s,
1817                                                       "converting 3.5 filesystem to the 3.6 format");
1818
1819                                 if (is_reiserfs_3_5(rs))
1820                                         /* put magic string of 3.6 format. 2.2 will not be able to
1821                                            mount this filesystem anymore */
1822                                         memcpy(rs->s_v1.s_magic,
1823                                                reiserfs_3_6_magic_string,
1824                                                sizeof
1825                                                (reiserfs_3_6_magic_string));
1826
1827                                 set_sb_version(rs, REISERFS_VERSION_2);
1828                                 reiserfs_convert_objectid_map_v1(s);
1829                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1830                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1831                         } else if (!silent) {
1832                                 reiserfs_info(s, "using 3.5.x disk format\n");
1833                         }
1834                 } else
1835                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1836
1837
1838                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1839                 errval = journal_end(&th, s, 1);
1840                 if (errval) {
1841                         dput(s->s_root);
1842                         s->s_root = NULL;
1843                         goto error;
1844                 }
1845
1846                 if ((errval = reiserfs_lookup_privroot(s)) ||
1847                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1848                         dput(s->s_root);
1849                         s->s_root = NULL;
1850                         goto error;
1851                 }
1852
1853                 /* look for files which were to be removed in previous session */
1854                 finish_unfinished(s);
1855         } else {
1856                 if (old_format_only(s) && !silent) {
1857                         reiserfs_info(s, "using 3.5.x disk format\n");
1858                 }
1859
1860                 if ((errval = reiserfs_lookup_privroot(s)) ||
1861                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1862                         dput(s->s_root);
1863                         s->s_root = NULL;
1864                         goto error;
1865                 }
1866         }
1867         // mark hash in super block: it could be unset. overwrite should be ok
1868         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1869
1870         handle_attrs(s);
1871
1872         reiserfs_proc_info_init(s);
1873
1874         init_waitqueue_head(&(sbi->s_wait));
1875         spin_lock_init(&sbi->bitmap_lock);
1876
1877         reiserfs_write_unlock(s);
1878
1879         return (0);
1880
1881 error:
1882         reiserfs_write_unlock(s);
1883 error_alloc:
1884         if (jinit_done) {       /* kill the commit thread, free journal ram */
1885                 journal_release_error(NULL, s);
1886         }
1887
1888         reiserfs_free_bitmap_cache(s);
1889         if (SB_BUFFER_WITH_SB(s))
1890                 brelse(SB_BUFFER_WITH_SB(s));
1891 #ifdef CONFIG_QUOTA
1892         {
1893                 int j;
1894                 for (j = 0; j < MAXQUOTAS; j++)
1895                         kfree(qf_names[j]);
1896         }
1897 #endif
1898         kfree(sbi);
1899
1900         s->s_fs_info = NULL;
1901         return errval;
1902 }
1903
1904 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1905 {
1906         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1907
1908         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1909         buf->f_bfree = sb_free_blocks(rs);
1910         buf->f_bavail = buf->f_bfree;
1911         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1912         buf->f_bsize = dentry->d_sb->s_blocksize;
1913         /* changed to accommodate gcc folks. */
1914         buf->f_type = REISERFS_SUPER_MAGIC;
1915         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1916         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1917                                 sizeof(rs->s_uuid)/2);
1918
1919         return 0;
1920 }
1921
1922 #ifdef CONFIG_QUOTA
1923 static int reiserfs_write_dquot(struct dquot *dquot)
1924 {
1925         struct reiserfs_transaction_handle th;
1926         int ret, err;
1927
1928         reiserfs_write_lock(dquot->dq_sb);
1929         ret =
1930             journal_begin(&th, dquot->dq_sb,
1931                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1932         if (ret)
1933                 goto out;
1934         ret = dquot_commit(dquot);
1935         err =
1936             journal_end(&th, dquot->dq_sb,
1937                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1938         if (!ret && err)
1939                 ret = err;
1940       out:
1941         reiserfs_write_unlock(dquot->dq_sb);
1942         return ret;
1943 }
1944
1945 static int reiserfs_acquire_dquot(struct dquot *dquot)
1946 {
1947         struct reiserfs_transaction_handle th;
1948         int ret, err;
1949
1950         reiserfs_write_lock(dquot->dq_sb);
1951         ret =
1952             journal_begin(&th, dquot->dq_sb,
1953                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1954         if (ret)
1955                 goto out;
1956         ret = dquot_acquire(dquot);
1957         err =
1958             journal_end(&th, dquot->dq_sb,
1959                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1960         if (!ret && err)
1961                 ret = err;
1962       out:
1963         reiserfs_write_unlock(dquot->dq_sb);
1964         return ret;
1965 }
1966
1967 static int reiserfs_release_dquot(struct dquot *dquot)
1968 {
1969         struct reiserfs_transaction_handle th;
1970         int ret, err;
1971
1972         reiserfs_write_lock(dquot->dq_sb);
1973         ret =
1974             journal_begin(&th, dquot->dq_sb,
1975                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1976         if (ret) {
1977                 /* Release dquot anyway to avoid endless cycle in dqput() */
1978                 dquot_release(dquot);
1979                 goto out;
1980         }
1981         ret = dquot_release(dquot);
1982         err =
1983             journal_end(&th, dquot->dq_sb,
1984                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1985         if (!ret && err)
1986                 ret = err;
1987       out:
1988         reiserfs_write_unlock(dquot->dq_sb);
1989         return ret;
1990 }
1991
1992 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1993 {
1994         /* Are we journaling quotas? */
1995         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1996             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1997                 dquot_mark_dquot_dirty(dquot);
1998                 return reiserfs_write_dquot(dquot);
1999         } else
2000                 return dquot_mark_dquot_dirty(dquot);
2001 }
2002
2003 static int reiserfs_write_info(struct super_block *sb, int type)
2004 {
2005         struct reiserfs_transaction_handle th;
2006         int ret, err;
2007
2008         /* Data block + inode block */
2009         reiserfs_write_lock(sb);
2010         ret = journal_begin(&th, sb, 2);
2011         if (ret)
2012                 goto out;
2013         ret = dquot_commit_info(sb, type);
2014         err = journal_end(&th, sb, 2);
2015         if (!ret && err)
2016                 ret = err;
2017       out:
2018         reiserfs_write_unlock(sb);
2019         return ret;
2020 }
2021
2022 /*
2023  * Turn on quotas during mount time - we need to find the quota file and such...
2024  */
2025 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2026 {
2027         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2028                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2029 }
2030
2031 /*
2032  * Standard function to be called on quota_on
2033  */
2034 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2035                              char *name, int remount)
2036 {
2037         int err;
2038         struct path path;
2039         struct inode *inode;
2040         struct reiserfs_transaction_handle th;
2041
2042         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2043                 return -EINVAL;
2044         /* No more checks needed? Path and format_id are bogus anyway... */
2045         if (remount)
2046                 return vfs_quota_on(sb, type, format_id, name, 1);
2047         err = kern_path(name, LOOKUP_FOLLOW, &path);
2048         if (err)
2049                 return err;
2050         /* Quotafile not on the same filesystem? */
2051         if (path.mnt->mnt_sb != sb) {
2052                 err = -EXDEV;
2053                 goto out;
2054         }
2055         inode = path.dentry->d_inode;
2056         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2057         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2058                 err = reiserfs_unpack(inode, NULL);
2059                 if (err) {
2060                         reiserfs_warning(sb, "super-6520",
2061                                 "Unpacking tail of quota file failed"
2062                                 " (%d). Cannot turn on quotas.", err);
2063                         err = -EINVAL;
2064                         goto out;
2065                 }
2066                 mark_inode_dirty(inode);
2067         }
2068         /* Journaling quota? */
2069         if (REISERFS_SB(sb)->s_qf_names[type]) {
2070                 /* Quotafile not of fs root? */
2071                 if (path.dentry->d_parent != sb->s_root)
2072                         reiserfs_warning(sb, "super-6521",
2073                                  "Quota file not on filesystem root. "
2074                                  "Journalled quota will not work.");
2075         }
2076
2077         /*
2078          * When we journal data on quota file, we have to flush journal to see
2079          * all updates to the file when we bypass pagecache...
2080          */
2081         if (reiserfs_file_data_log(inode)) {
2082                 /* Just start temporary transaction and finish it */
2083                 err = journal_begin(&th, sb, 1);
2084                 if (err)
2085                         goto out;
2086                 err = journal_end_sync(&th, sb, 1);
2087                 if (err)
2088                         goto out;
2089         }
2090         err = vfs_quota_on_path(sb, type, format_id, &path);
2091 out:
2092         path_put(&path);
2093         return err;
2094 }
2095
2096 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2097  * acquiring the locks... As quota files are never truncated and quota code
2098  * itself serializes the operations (and noone else should touch the files)
2099  * we don't have to be afraid of races */
2100 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2101                                    size_t len, loff_t off)
2102 {
2103         struct inode *inode = sb_dqopt(sb)->files[type];
2104         unsigned long blk = off >> sb->s_blocksize_bits;
2105         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2106         size_t toread;
2107         struct buffer_head tmp_bh, *bh;
2108         loff_t i_size = i_size_read(inode);
2109
2110         if (off > i_size)
2111                 return 0;
2112         if (off + len > i_size)
2113                 len = i_size - off;
2114         toread = len;
2115         while (toread > 0) {
2116                 tocopy =
2117                     sb->s_blocksize - offset <
2118                     toread ? sb->s_blocksize - offset : toread;
2119                 tmp_bh.b_state = 0;
2120                 /* Quota files are without tails so we can safely use this function */
2121                 reiserfs_write_lock(sb);
2122                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2123                 reiserfs_write_unlock(sb);
2124                 if (err)
2125                         return err;
2126                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2127                         memset(data, 0, tocopy);
2128                 else {
2129                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2130                         if (!bh)
2131                                 return -EIO;
2132                         memcpy(data, bh->b_data + offset, tocopy);
2133                         brelse(bh);
2134                 }
2135                 offset = 0;
2136                 toread -= tocopy;
2137                 data += tocopy;
2138                 blk++;
2139         }
2140         return len;
2141 }
2142
2143 /* Write to quotafile (we know the transaction is already started and has
2144  * enough credits) */
2145 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2146                                     const char *data, size_t len, loff_t off)
2147 {
2148         struct inode *inode = sb_dqopt(sb)->files[type];
2149         unsigned long blk = off >> sb->s_blocksize_bits;
2150         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2151         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2152         size_t towrite = len;
2153         struct buffer_head tmp_bh, *bh;
2154
2155         if (!current->journal_info) {
2156                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2157                         " cancelled because transaction is not started.\n",
2158                         (unsigned long long)off, (unsigned long long)len);
2159                 return -EIO;
2160         }
2161         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2162         while (towrite > 0) {
2163                 tocopy = sb->s_blocksize - offset < towrite ?
2164                     sb->s_blocksize - offset : towrite;
2165                 tmp_bh.b_state = 0;
2166                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2167                 if (err)
2168                         goto out;
2169                 if (offset || tocopy != sb->s_blocksize)
2170                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2171                 else
2172                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2173                 if (!bh) {
2174                         err = -EIO;
2175                         goto out;
2176                 }
2177                 lock_buffer(bh);
2178                 memcpy(bh->b_data + offset, data, tocopy);
2179                 flush_dcache_page(bh->b_page);
2180                 set_buffer_uptodate(bh);
2181                 unlock_buffer(bh);
2182                 reiserfs_prepare_for_journal(sb, bh, 1);
2183                 journal_mark_dirty(current->journal_info, sb, bh);
2184                 if (!journal_quota)
2185                         reiserfs_add_ordered_list(inode, bh);
2186                 brelse(bh);
2187                 offset = 0;
2188                 towrite -= tocopy;
2189                 data += tocopy;
2190                 blk++;
2191         }
2192 out:
2193         if (len == towrite) {
2194                 mutex_unlock(&inode->i_mutex);
2195                 return err;
2196         }
2197         if (inode->i_size < off + len - towrite)
2198                 i_size_write(inode, off + len - towrite);
2199         inode->i_version++;
2200         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2201         mark_inode_dirty(inode);
2202         mutex_unlock(&inode->i_mutex);
2203         return len - towrite;
2204 }
2205
2206 #endif
2207
2208 static int get_super_block(struct file_system_type *fs_type,
2209                            int flags, const char *dev_name,
2210                            void *data, struct vfsmount *mnt)
2211 {
2212         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2213                            mnt);
2214 }
2215
2216 static int __init init_reiserfs_fs(void)
2217 {
2218         int ret;
2219
2220         if ((ret = init_inodecache())) {
2221                 return ret;
2222         }
2223
2224         reiserfs_proc_info_global_init();
2225         reiserfs_proc_register_global("version",
2226                                       reiserfs_global_version_in_proc);
2227
2228         ret = register_filesystem(&reiserfs_fs_type);
2229
2230         if (ret == 0) {
2231                 return 0;
2232         }
2233
2234         reiserfs_proc_unregister_global("version");
2235         reiserfs_proc_info_global_done();
2236         destroy_inodecache();
2237
2238         return ret;
2239 }
2240
2241 static void __exit exit_reiserfs_fs(void)
2242 {
2243         reiserfs_proc_unregister_global("version");
2244         reiserfs_proc_info_global_done();
2245         unregister_filesystem(&reiserfs_fs_type);
2246         destroy_inodecache();
2247 }
2248
2249 struct file_system_type reiserfs_fs_type = {
2250         .owner = THIS_MODULE,
2251         .name = "reiserfs",
2252         .get_sb = get_super_block,
2253         .kill_sb = reiserfs_kill_sb,
2254         .fs_flags = FS_REQUIRES_DEV,
2255 };
2256
2257 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2258 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2259 MODULE_LICENSE("GPL");
2260
2261 module_init(init_reiserfs_fs);
2262 module_exit(exit_reiserfs_fs);