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