dquot: cleanup space allocation / freeing routines
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/crc32.h>
30 #include <linux/smp_lock.h>
31
32 struct file_system_type reiserfs_fs_type;
33
34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
37
38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
39 {
40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
41                         strlen(reiserfs_3_5_magic_string));
42 }
43
44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
45 {
46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
47                         strlen(reiserfs_3_6_magic_string));
48 }
49
50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
51 {
52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
53                         strlen(reiserfs_jr_magic_string));
54 }
55
56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
57 {
58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
59                 is_reiserfs_jr(rs));
60 }
61
62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
64
65 static int reiserfs_sync_fs(struct super_block *s, int wait)
66 {
67         struct reiserfs_transaction_handle th;
68
69         reiserfs_write_lock(s);
70         if (!journal_begin(&th, s, 1))
71                 if (!journal_end_sync(&th, s, 1))
72                         reiserfs_flush_old_commits(s);
73         s->s_dirt = 0;  /* Even if it's not true.
74                          * We'll loop forever in sync_supers otherwise */
75         reiserfs_write_unlock(s);
76         return 0;
77 }
78
79 static void reiserfs_write_super(struct super_block *s)
80 {
81         reiserfs_sync_fs(s, 1);
82 }
83
84 static int reiserfs_freeze(struct super_block *s)
85 {
86         struct reiserfs_transaction_handle th;
87         reiserfs_write_lock(s);
88         if (!(s->s_flags & MS_RDONLY)) {
89                 int err = journal_begin(&th, s, 1);
90                 if (err) {
91                         reiserfs_block_writes(&th);
92                 } else {
93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
94                                                      1);
95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
96                         reiserfs_block_writes(&th);
97                         journal_end_sync(&th, s, 1);
98                 }
99         }
100         s->s_dirt = 0;
101         reiserfs_write_unlock(s);
102         return 0;
103 }
104
105 static int reiserfs_unfreeze(struct super_block *s)
106 {
107         reiserfs_allow_writes(s);
108         return 0;
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114    file it points to. It can either happen if unlink is completed but
115    "save unlink" removal, or if file has both unlink and truncate
116    pending and as unlink completes first (because key of "save link"
117    protecting unlink is bigger that a key lf "save link" which
118    protects truncate), so there left no items to make truncate
119    completion on */
120 static int remove_save_link_only(struct super_block *s,
121                                  struct reiserfs_key *key, int oid_free)
122 {
123         struct reiserfs_transaction_handle th;
124         int err;
125
126         /* we are going to do one balancing */
127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128         if (err)
129                 return err;
130
131         reiserfs_delete_solid_item(&th, NULL, key);
132         if (oid_free)
133                 /* removals are protected by direct items */
134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146         INITIALIZE_PATH(path);
147         struct cpu_key max_cpu_key, obj_key;
148         struct reiserfs_key save_link_key, last_inode_key;
149         int retval = 0;
150         struct item_head *ih;
151         struct buffer_head *bh;
152         int item_pos;
153         char *item;
154         int done;
155         struct inode *inode;
156         int truncate;
157 #ifdef CONFIG_QUOTA
158         int i;
159         int ms_active_set;
160 #endif
161
162         /* compose key to look for "save" links */
163         max_cpu_key.version = KEY_FORMAT_3_5;
164         max_cpu_key.on_disk_key.k_dir_id = ~0U;
165         max_cpu_key.on_disk_key.k_objectid = ~0U;
166         set_cpu_key_k_offset(&max_cpu_key, ~0U);
167         max_cpu_key.key_length = 3;
168
169         memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172         /* Needed for iput() to work correctly and not trash data */
173         if (s->s_flags & MS_ACTIVE) {
174                 ms_active_set = 0;
175         } else {
176                 ms_active_set = 1;
177                 s->s_flags |= MS_ACTIVE;
178         }
179         /* Turn on quotas so that they are updated correctly */
180         for (i = 0; i < MAXQUOTAS; i++) {
181                 if (REISERFS_SB(s)->s_qf_names[i]) {
182                         int ret = reiserfs_quota_on_mount(s, i);
183                         if (ret < 0)
184                                 reiserfs_warning(s, "reiserfs-2500",
185                                                  "cannot turn on journaled "
186                                                  "quota: error %d", ret);
187                 }
188         }
189 #endif
190
191         done = 0;
192         REISERFS_SB(s)->s_is_unlinked_ok = 1;
193         while (!retval) {
194                 retval = search_item(s, &max_cpu_key, &path);
195                 if (retval != ITEM_NOT_FOUND) {
196                         reiserfs_error(s, "vs-2140",
197                                        "search_by_key returned %d", retval);
198                         break;
199                 }
200
201                 bh = get_last_bh(&path);
202                 item_pos = get_item_pos(&path);
203                 if (item_pos != B_NR_ITEMS(bh)) {
204                         reiserfs_warning(s, "vs-2060",
205                                          "wrong position found");
206                         break;
207                 }
208                 item_pos--;
209                 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212                         /* there are no "save" links anymore */
213                         break;
214
215                 save_link_key = ih->ih_key;
216                 if (is_indirect_le_ih(ih))
217                         truncate = 1;
218                 else
219                         truncate = 0;
220
221                 /* reiserfs_iget needs k_dirid and k_objectid only */
222                 item = B_I_PITEM(bh, ih);
223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224                 obj_key.on_disk_key.k_objectid =
225                     le32_to_cpu(ih->ih_key.k_objectid);
226                 obj_key.on_disk_key.k_offset = 0;
227                 obj_key.on_disk_key.k_type = 0;
228
229                 pathrelse(&path);
230
231                 inode = reiserfs_iget(s, &obj_key);
232                 if (!inode) {
233                         /* the unlink almost completed, it just did not manage to remove
234                            "save" link and release objectid */
235                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
236                                          &obj_key);
237                         retval = remove_save_link_only(s, &save_link_key, 1);
238                         continue;
239                 }
240
241                 if (!truncate && inode->i_nlink) {
242                         /* file is not unlinked */
243                         reiserfs_warning(s, "vs-2185",
244                                          "file %K is not unlinked",
245                                          &obj_key);
246                         retval = remove_save_link_only(s, &save_link_key, 0);
247                         continue;
248                 }
249                 vfs_dq_init(inode);
250
251                 if (truncate && S_ISDIR(inode->i_mode)) {
252                         /* We got a truncate request for a dir which is impossible.
253                            The only imaginable way is to execute unfinished truncate request
254                            then boot into old kernel, remove the file and create dir with
255                            the same key. */
256                         reiserfs_warning(s, "green-2101",
257                                          "impossible truncate on a "
258                                          "directory %k. Please report",
259                                          INODE_PKEY(inode));
260                         retval = remove_save_link_only(s, &save_link_key, 0);
261                         truncate = 0;
262                         iput(inode);
263                         continue;
264                 }
265
266                 if (truncate) {
267                         REISERFS_I(inode)->i_flags |=
268                             i_link_saved_truncate_mask;
269                         /* not completed truncate found. New size was committed together
270                            with "save" link */
271                         reiserfs_info(s, "Truncating %k to %Ld ..",
272                                       INODE_PKEY(inode), inode->i_size);
273                         reiserfs_truncate_file(inode,
274                                                0
275                                                /*don't update modification time */
276                                                );
277                         retval = remove_save_link(inode, truncate);
278                 } else {
279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280                         /* not completed unlink (rmdir) found */
281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
283                                         sizeof(last_inode_key))){
284                                 last_inode_key = *INODE_PKEY(inode);
285                                 /* removal gets completed in iput */
286                                 retval = 0;
287                         } else {
288                                 reiserfs_warning(s, "super-2189", "Dead loop "
289                                                  "in finish_unfinished "
290                                                  "detected, just remove "
291                                                  "save link\n");
292                                 retval = remove_save_link_only(s,
293                                                         &save_link_key, 0);
294                         }
295                 }
296
297                 iput(inode);
298                 printk("done\n");
299                 done++;
300         }
301         REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304         /* Turn quotas off */
305         for (i = 0; i < MAXQUOTAS; i++) {
306                 if (sb_dqopt(s)->files[i])
307                         vfs_quota_off(s, i, 0);
308         }
309         if (ms_active_set)
310                 /* Restore the flag back */
311                 s->s_flags &= ~MS_ACTIVE;
312 #endif
313         pathrelse(&path);
314         if (done)
315                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316                               "Completed\n", done);
317         return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321    being unlinked. This link will be deleted in the same transaction with last
322    item of file. mounting the filesystem we scan all these links and remove
323    files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325                    struct inode *inode, int truncate)
326 {
327         INITIALIZE_PATH(path);
328         int retval;
329         struct cpu_key key;
330         struct item_head ih;
331         __le32 link;
332
333         BUG_ON(!th->t_trans_id);
334
335         /* file can only get one "save link" of each kind */
336         RFALSE(truncate &&
337                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338                "saved link already exists for truncated inode %lx",
339                (long)inode->i_ino);
340         RFALSE(!truncate &&
341                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342                "saved link already exists for unlinked inode %lx",
343                (long)inode->i_ino);
344
345         /* setup key of "save" link */
346         key.version = KEY_FORMAT_3_5;
347         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348         key.on_disk_key.k_objectid = inode->i_ino;
349         if (!truncate) {
350                 /* unlink, rmdir, rename */
351                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352                 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354                 /* item head of "safe" link */
355                 make_le_item_head(&ih, &key, key.version,
356                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357                                   4 /*length */ , 0xffff /*free space */ );
358         } else {
359                 /* truncate */
360                 if (S_ISDIR(inode->i_mode))
361                         reiserfs_warning(inode->i_sb, "green-2102",
362                                          "Adding a truncate savelink for "
363                                          "a directory %k! Please report",
364                                          INODE_PKEY(inode));
365                 set_cpu_key_k_offset(&key, 1);
366                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
367
368                 /* item head of "safe" link */
369                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
370                                   4 /*length */ , 0 /*free space */ );
371         }
372         key.key_length = 3;
373
374         /* look for its place in the tree */
375         retval = search_item(inode->i_sb, &key, &path);
376         if (retval != ITEM_NOT_FOUND) {
377                 if (retval != -ENOSPC)
378                         reiserfs_error(inode->i_sb, "vs-2100",
379                                        "search_by_key (%K) returned %d", &key,
380                                        retval);
381                 pathrelse(&path);
382                 return;
383         }
384
385         /* body of "save" link */
386         link = INODE_PKEY(inode)->k_dir_id;
387
388         /* put "save" link inot tree, don't charge quota to anyone */
389         retval =
390             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
391         if (retval) {
392                 if (retval != -ENOSPC)
393                         reiserfs_error(inode->i_sb, "vs-2120",
394                                        "insert_item returned %d", retval);
395         } else {
396                 if (truncate)
397                         REISERFS_I(inode)->i_flags |=
398                             i_link_saved_truncate_mask;
399                 else
400                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401         }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407         struct reiserfs_transaction_handle th;
408         struct reiserfs_key key;
409         int err;
410
411         /* we are going to do one balancing only */
412         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413         if (err)
414                 return err;
415
416         /* setup key of "save" link */
417         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418         key.k_objectid = INODE_PKEY(inode)->k_objectid;
419         if (!truncate) {
420                 /* unlink, rmdir, rename */
421                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422                                     1 + inode->i_sb->s_blocksize);
423                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424         } else {
425                 /* truncate */
426                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428         }
429
430         if ((truncate &&
431              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432             (!truncate &&
433              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434                 /* don't take quota bytes from anywhere */
435                 reiserfs_delete_solid_item(&th, NULL, &key);
436         if (!truncate) {
437                 reiserfs_release_objectid(&th, inode->i_ino);
438                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439         } else
440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447         if (REISERFS_SB(s)) {
448                 if (REISERFS_SB(s)->xattr_root) {
449                         d_invalidate(REISERFS_SB(s)->xattr_root);
450                         dput(REISERFS_SB(s)->xattr_root);
451                         REISERFS_SB(s)->xattr_root = NULL;
452                 }
453                 if (REISERFS_SB(s)->priv_root) {
454                         d_invalidate(REISERFS_SB(s)->priv_root);
455                         dput(REISERFS_SB(s)->priv_root);
456                         REISERFS_SB(s)->priv_root = NULL;
457                 }
458         }
459
460         kill_block_super(s);
461 }
462
463 static void reiserfs_put_super(struct super_block *s)
464 {
465         struct reiserfs_transaction_handle th;
466         th.t_trans_id = 0;
467
468         reiserfs_write_lock(s);
469
470         if (s->s_dirt)
471                 reiserfs_write_super(s);
472
473         /* change file system state to current state if it was mounted with read-write permissions */
474         if (!(s->s_flags & MS_RDONLY)) {
475                 if (!journal_begin(&th, s, 10)) {
476                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
477                                                      1);
478                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
479                                             REISERFS_SB(s)->s_mount_state);
480                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
481                 }
482         }
483
484         /* note, journal_release checks for readonly mount, and can decide not
485          ** to do a journal_end
486          */
487         journal_release(&th, s);
488
489         reiserfs_free_bitmap_cache(s);
490
491         brelse(SB_BUFFER_WITH_SB(s));
492
493         print_statistics(s);
494
495         if (REISERFS_SB(s)->reserved_blocks != 0) {
496                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
497                                  REISERFS_SB(s)->reserved_blocks);
498         }
499
500         reiserfs_proc_info_done(s);
501
502         reiserfs_write_unlock(s);
503         mutex_destroy(&REISERFS_SB(s)->lock);
504         kfree(s->s_fs_info);
505         s->s_fs_info = NULL;
506 }
507
508 static struct kmem_cache *reiserfs_inode_cachep;
509
510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
511 {
512         struct reiserfs_inode_info *ei;
513         ei = (struct reiserfs_inode_info *)
514             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
515         if (!ei)
516                 return NULL;
517         return &ei->vfs_inode;
518 }
519
520 static void reiserfs_destroy_inode(struct inode *inode)
521 {
522         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
523 }
524
525 static void init_once(void *foo)
526 {
527         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
528
529         INIT_LIST_HEAD(&ei->i_prealloc_list);
530         inode_init_once(&ei->vfs_inode);
531 }
532
533 static int init_inodecache(void)
534 {
535         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
536                                                   sizeof(struct
537                                                          reiserfs_inode_info),
538                                                   0, (SLAB_RECLAIM_ACCOUNT|
539                                                         SLAB_MEM_SPREAD),
540                                                   init_once);
541         if (reiserfs_inode_cachep == NULL)
542                 return -ENOMEM;
543         return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548         kmem_cache_destroy(reiserfs_inode_cachep);
549 }
550
551 /* we don't mark inodes dirty, we just log them */
552 static void reiserfs_dirty_inode(struct inode *inode)
553 {
554         struct reiserfs_transaction_handle th;
555
556         int err = 0;
557         int lock_depth;
558
559         if (inode->i_sb->s_flags & MS_RDONLY) {
560                 reiserfs_warning(inode->i_sb, "clm-6006",
561                                  "writing inode %lu on readonly FS",
562                                  inode->i_ino);
563                 return;
564         }
565         lock_depth = reiserfs_write_lock_once(inode->i_sb);
566
567         /* this is really only used for atime updates, so they don't have
568          ** to be included in O_SYNC or fsync
569          */
570         err = journal_begin(&th, inode->i_sb, 1);
571         if (err)
572                 goto out;
573
574         reiserfs_update_sd(&th, inode);
575         journal_end(&th, inode->i_sb, 1);
576
577 out:
578         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
579 }
580
581 #ifdef CONFIG_QUOTA
582 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
583                                     size_t, loff_t);
584 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
585                                    loff_t);
586 #endif
587
588 static const struct super_operations reiserfs_sops = {
589         .alloc_inode = reiserfs_alloc_inode,
590         .destroy_inode = reiserfs_destroy_inode,
591         .write_inode = reiserfs_write_inode,
592         .dirty_inode = reiserfs_dirty_inode,
593         .delete_inode = reiserfs_delete_inode,
594         .put_super = reiserfs_put_super,
595         .write_super = reiserfs_write_super,
596         .sync_fs = reiserfs_sync_fs,
597         .freeze_fs = reiserfs_freeze,
598         .unfreeze_fs = reiserfs_unfreeze,
599         .statfs = reiserfs_statfs,
600         .remount_fs = reiserfs_remount,
601         .show_options = generic_show_options,
602 #ifdef CONFIG_QUOTA
603         .quota_read = reiserfs_quota_read,
604         .quota_write = reiserfs_quota_write,
605 #endif
606 };
607
608 #ifdef CONFIG_QUOTA
609 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
610
611 static int reiserfs_write_dquot(struct dquot *);
612 static int reiserfs_acquire_dquot(struct dquot *);
613 static int reiserfs_release_dquot(struct dquot *);
614 static int reiserfs_mark_dquot_dirty(struct dquot *);
615 static int reiserfs_write_info(struct super_block *, int);
616 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
617
618 static const struct dquot_operations reiserfs_quota_operations = {
619         .initialize = dquot_initialize,
620         .drop = dquot_drop,
621         .alloc_inode = dquot_alloc_inode,
622         .free_inode = dquot_free_inode,
623         .transfer = dquot_transfer,
624         .write_dquot = reiserfs_write_dquot,
625         .acquire_dquot = reiserfs_acquire_dquot,
626         .release_dquot = reiserfs_release_dquot,
627         .mark_dirty = reiserfs_mark_dquot_dirty,
628         .write_info = reiserfs_write_info,
629         .alloc_dquot    = dquot_alloc,
630         .destroy_dquot  = dquot_destroy,
631 };
632
633 static const struct quotactl_ops reiserfs_qctl_operations = {
634         .quota_on = reiserfs_quota_on,
635         .quota_off = vfs_quota_off,
636         .quota_sync = vfs_quota_sync,
637         .get_info = vfs_get_dqinfo,
638         .set_info = vfs_set_dqinfo,
639         .get_dqblk = vfs_get_dqblk,
640         .set_dqblk = vfs_set_dqblk,
641 };
642 #endif
643
644 static const struct export_operations reiserfs_export_ops = {
645         .encode_fh = reiserfs_encode_fh,
646         .fh_to_dentry = reiserfs_fh_to_dentry,
647         .fh_to_parent = reiserfs_fh_to_parent,
648         .get_parent = reiserfs_get_parent,
649 };
650
651 /* this struct is used in reiserfs_getopt () for containing the value for those
652    mount options that have values rather than being toggles. */
653 typedef struct {
654         char *value;
655         int setmask;            /* bitmask which is to set on mount_options bitmask when this
656                                    value is found, 0 is no bits are to be changed. */
657         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
658                                    value is found, 0 is no bits are to be changed. This is
659                                    applied BEFORE setmask */
660 } arg_desc_t;
661
662 /* Set this bit in arg_required to allow empty arguments */
663 #define REISERFS_OPT_ALLOWEMPTY 31
664
665 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
666    mount options */
667 typedef struct {
668         char *option_name;
669         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
670         const arg_desc_t *values;       /* list of values accepted by an option */
671         int setmask;            /* bitmask which is to set on mount_options bitmask when this
672                                    value is found, 0 is no bits are to be changed. */
673         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
674                                    value is found, 0 is no bits are to be changed. This is
675                                    applied BEFORE setmask */
676 } opt_desc_t;
677
678 /* possible values for -o data= */
679 static const arg_desc_t logging_mode[] = {
680         {"ordered", 1 << REISERFS_DATA_ORDERED,
681          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
682         {"journal", 1 << REISERFS_DATA_LOG,
683          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
684         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
685          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
686         {.value = NULL}
687 };
688
689 /* possible values for -o barrier= */
690 static const arg_desc_t barrier_mode[] = {
691         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
692         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
693         {.value = NULL}
694 };
695
696 /* possible values for "-o block-allocator=" and bits which are to be set in
697    s_mount_opt of reiserfs specific part of in-core super block */
698 static const arg_desc_t balloc[] = {
699         {"noborder", 1 << REISERFS_NO_BORDER, 0},
700         {"border", 0, 1 << REISERFS_NO_BORDER},
701         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
702         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
703         {"test4", 1 << REISERFS_TEST4, 0},
704         {"notest4", 0, 1 << REISERFS_TEST4},
705         {NULL, 0, 0}
706 };
707
708 static const arg_desc_t tails[] = {
709         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
710         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
711         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
712         {NULL, 0, 0}
713 };
714
715 static const arg_desc_t error_actions[] = {
716         {"panic", 1 << REISERFS_ERROR_PANIC,
717          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
718         {"ro-remount", 1 << REISERFS_ERROR_RO,
719          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
720 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
721         {"continue", 1 << REISERFS_ERROR_CONTINUE,
722          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
723 #endif
724         {NULL, 0, 0},
725 };
726
727 /* proceed only one option from a list *cur - string containing of mount options
728    opts - array of options which are accepted
729    opt_arg - if option is found and requires an argument and if it is specifed
730    in the input - pointer to the argument is stored here
731    bit_flags - if option requires to set a certain bit - it is set here
732    return -1 if unknown option is found, opt->arg_required otherwise */
733 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
734                            char **opt_arg, unsigned long *bit_flags)
735 {
736         char *p;
737         /* foo=bar,
738            ^   ^  ^
739            |   |  +-- option_end
740            |   +-- arg_start
741            +-- option_start
742          */
743         const opt_desc_t *opt;
744         const arg_desc_t *arg;
745
746         p = *cur;
747
748         /* assume argument cannot contain commas */
749         *cur = strchr(p, ',');
750         if (*cur) {
751                 *(*cur) = '\0';
752                 (*cur)++;
753         }
754
755         if (!strncmp(p, "alloc=", 6)) {
756                 /* Ugly special case, probably we should redo options parser so that
757                    it can understand several arguments for some options, also so that
758                    it can fill several bitfields with option values. */
759                 if (reiserfs_parse_alloc_options(s, p + 6)) {
760                         return -1;
761                 } else {
762                         return 0;
763                 }
764         }
765
766         /* for every option in the list */
767         for (opt = opts; opt->option_name; opt++) {
768                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
769                         if (bit_flags) {
770                                 if (opt->clrmask ==
771                                     (1 << REISERFS_UNSUPPORTED_OPT))
772                                         reiserfs_warning(s, "super-6500",
773                                                          "%s not supported.\n",
774                                                          p);
775                                 else
776                                         *bit_flags &= ~opt->clrmask;
777                                 if (opt->setmask ==
778                                     (1 << REISERFS_UNSUPPORTED_OPT))
779                                         reiserfs_warning(s, "super-6501",
780                                                          "%s not supported.\n",
781                                                          p);
782                                 else
783                                         *bit_flags |= opt->setmask;
784                         }
785                         break;
786                 }
787         }
788         if (!opt->option_name) {
789                 reiserfs_warning(s, "super-6502",
790                                  "unknown mount option \"%s\"", p);
791                 return -1;
792         }
793
794         p += strlen(opt->option_name);
795         switch (*p) {
796         case '=':
797                 if (!opt->arg_required) {
798                         reiserfs_warning(s, "super-6503",
799                                          "the option \"%s\" does not "
800                                          "require an argument\n",
801                                          opt->option_name);
802                         return -1;
803                 }
804                 break;
805
806         case 0:
807                 if (opt->arg_required) {
808                         reiserfs_warning(s, "super-6504",
809                                          "the option \"%s\" requires an "
810                                          "argument\n", opt->option_name);
811                         return -1;
812                 }
813                 break;
814         default:
815                 reiserfs_warning(s, "super-6505",
816                                  "head of option \"%s\" is only correct\n",
817                                  opt->option_name);
818                 return -1;
819         }
820
821         /* move to the argument, or to next option if argument is not required */
822         p++;
823
824         if (opt->arg_required
825             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
826             && !strlen(p)) {
827                 /* this catches "option=," if not allowed */
828                 reiserfs_warning(s, "super-6506",
829                                  "empty argument for \"%s\"\n",
830                                  opt->option_name);
831                 return -1;
832         }
833
834         if (!opt->values) {
835                 /* *=NULLopt_arg contains pointer to argument */
836                 *opt_arg = p;
837                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
838         }
839
840         /* values possible for this option are listed in opt->values */
841         for (arg = opt->values; arg->value; arg++) {
842                 if (!strcmp(p, arg->value)) {
843                         if (bit_flags) {
844                                 *bit_flags &= ~arg->clrmask;
845                                 *bit_flags |= arg->setmask;
846                         }
847                         return opt->arg_required;
848                 }
849         }
850
851         reiserfs_warning(s, "super-6506",
852                          "bad value \"%s\" for option \"%s\"\n", p,
853                          opt->option_name);
854         return -1;
855 }
856
857 /* returns 0 if something is wrong in option string, 1 - otherwise */
858 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
859                                   unsigned long *mount_options,
860                                   /* after the parsing phase, contains the
861                                      collection of bitflags defining what
862                                      mount options were selected. */
863                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
864                                   char **jdev_name,
865                                   unsigned int *commit_max_age,
866                                   char **qf_names,
867                                   unsigned int *qfmt)
868 {
869         int c;
870         char *arg = NULL;
871         char *pos;
872         opt_desc_t opts[] = {
873                 /* Compatibility stuff, so that -o notail for old setups still work */
874                 {"tails",.arg_required = 't',.values = tails},
875                 {"notail",.clrmask =
876                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
877                 {"conv",.setmask = 1 << REISERFS_CONVERT},
878                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
879                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
880                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
881 #ifdef CONFIG_REISERFS_FS_XATTR
882                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
883                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
884 #else
885                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
886                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
887 #endif
888 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
889                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
890                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
891 #else
892                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
893                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
894 #endif
895                 {.option_name = "nolog"},
896                 {"replayonly",.setmask = 1 << REPLAYONLY},
897                 {"block-allocator",.arg_required = 'a',.values = balloc},
898                 {"data",.arg_required = 'd',.values = logging_mode},
899                 {"barrier",.arg_required = 'b',.values = barrier_mode},
900                 {"resize",.arg_required = 'r',.values = NULL},
901                 {"jdev",.arg_required = 'j',.values = NULL},
902                 {"nolargeio",.arg_required = 'w',.values = NULL},
903                 {"commit",.arg_required = 'c',.values = NULL},
904                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
905                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
906                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
907                 {"errors",.arg_required = 'e',.values = error_actions},
908                 {"usrjquota",.arg_required =
909                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
910                 {"grpjquota",.arg_required =
911                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912                 {"jqfmt",.arg_required = 'f',.values = NULL},
913                 {.option_name = NULL}
914         };
915
916         *blocks = 0;
917         if (!options || !*options)
918                 /* use default configuration: create tails, journaling on, no
919                    conversion to newest format */
920                 return 1;
921
922         for (pos = options; pos;) {
923                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
924                 if (c == -1)
925                         /* wrong option is given */
926                         return 0;
927
928                 if (c == 'r') {
929                         char *p;
930
931                         p = NULL;
932                         /* "resize=NNN" or "resize=auto" */
933
934                         if (!strcmp(arg, "auto")) {
935                                 /* From JFS code, to auto-get the size. */
936                                 *blocks =
937                                     s->s_bdev->bd_inode->i_size >> s->
938                                     s_blocksize_bits;
939                         } else {
940                                 *blocks = simple_strtoul(arg, &p, 0);
941                                 if (*p != '\0') {
942                                         /* NNN does not look like a number */
943                                         reiserfs_warning(s, "super-6507",
944                                                          "bad value %s for "
945                                                          "-oresize\n", arg);
946                                         return 0;
947                                 }
948                         }
949                 }
950
951                 if (c == 'c') {
952                         char *p = NULL;
953                         unsigned long val = simple_strtoul(arg, &p, 0);
954                         /* commit=NNN (time in seconds) */
955                         if (*p != '\0' || val >= (unsigned int)-1) {
956                                 reiserfs_warning(s, "super-6508",
957                                                  "bad value %s for -ocommit\n",
958                                                  arg);
959                                 return 0;
960                         }
961                         *commit_max_age = (unsigned int)val;
962                 }
963
964                 if (c == 'w') {
965                         reiserfs_warning(s, "super-6509", "nolargeio option "
966                                          "is no longer supported");
967                         return 0;
968                 }
969
970                 if (c == 'j') {
971                         if (arg && *arg && jdev_name) {
972                                 if (*jdev_name) {       //Hm, already assigned?
973                                         reiserfs_warning(s, "super-6510",
974                                                          "journal device was "
975                                                          "already specified to "
976                                                          "be %s", *jdev_name);
977                                         return 0;
978                                 }
979                                 *jdev_name = arg;
980                         }
981                 }
982 #ifdef CONFIG_QUOTA
983                 if (c == 'u' || c == 'g') {
984                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
985
986                         if (sb_any_quota_loaded(s) &&
987                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
988                                 reiserfs_warning(s, "super-6511",
989                                                  "cannot change journaled "
990                                                  "quota options when quota "
991                                                  "turned on.");
992                                 return 0;
993                         }
994                         if (*arg) {     /* Some filename specified? */
995                                 if (REISERFS_SB(s)->s_qf_names[qtype]
996                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
997                                               arg)) {
998                                         reiserfs_warning(s, "super-6512",
999                                                          "%s quota file "
1000                                                          "already specified.",
1001                                                          QTYPE2NAME(qtype));
1002                                         return 0;
1003                                 }
1004                                 if (strchr(arg, '/')) {
1005                                         reiserfs_warning(s, "super-6513",
1006                                                          "quotafile must be "
1007                                                          "on filesystem root.");
1008                                         return 0;
1009                                 }
1010                                 qf_names[qtype] =
1011                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1012                                 if (!qf_names[qtype]) {
1013                                         reiserfs_warning(s, "reiserfs-2502",
1014                                                          "not enough memory "
1015                                                          "for storing "
1016                                                          "quotafile name.");
1017                                         return 0;
1018                                 }
1019                                 strcpy(qf_names[qtype], arg);
1020                                 *mount_options |= 1 << REISERFS_QUOTA;
1021                         } else {
1022                                 if (qf_names[qtype] !=
1023                                     REISERFS_SB(s)->s_qf_names[qtype])
1024                                         kfree(qf_names[qtype]);
1025                                 qf_names[qtype] = NULL;
1026                         }
1027                 }
1028                 if (c == 'f') {
1029                         if (!strcmp(arg, "vfsold"))
1030                                 *qfmt = QFMT_VFS_OLD;
1031                         else if (!strcmp(arg, "vfsv0"))
1032                                 *qfmt = QFMT_VFS_V0;
1033                         else {
1034                                 reiserfs_warning(s, "super-6514",
1035                                                  "unknown quota format "
1036                                                  "specified.");
1037                                 return 0;
1038                         }
1039                         if (sb_any_quota_loaded(s) &&
1040                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1041                                 reiserfs_warning(s, "super-6515",
1042                                                  "cannot change journaled "
1043                                                  "quota options when quota "
1044                                                  "turned on.");
1045                                 return 0;
1046                         }
1047                 }
1048 #else
1049                 if (c == 'u' || c == 'g' || c == 'f') {
1050                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1051                                          "quota options not supported.");
1052                         return 0;
1053                 }
1054 #endif
1055         }
1056
1057 #ifdef CONFIG_QUOTA
1058         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1059             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1060                 reiserfs_warning(s, "super-6515",
1061                                  "journaled quota format not specified.");
1062                 return 0;
1063         }
1064         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1065         if (!(*mount_options & (1 << REISERFS_QUOTA))
1066             && sb_any_quota_loaded(s)) {
1067                 reiserfs_warning(s, "super-6516", "quota options must "
1068                                  "be present when quota is turned on.");
1069                 return 0;
1070         }
1071 #endif
1072
1073         return 1;
1074 }
1075
1076 static void switch_data_mode(struct super_block *s, unsigned long mode)
1077 {
1078         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1079                                          (1 << REISERFS_DATA_ORDERED) |
1080                                          (1 << REISERFS_DATA_WRITEBACK));
1081         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1082 }
1083
1084 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1085 {
1086         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1087                 if (!reiserfs_data_log(s)) {
1088                         switch_data_mode(s, REISERFS_DATA_LOG);
1089                         reiserfs_info(s, "switching to journaled data mode\n");
1090                 }
1091         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1092                 if (!reiserfs_data_ordered(s)) {
1093                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1094                         reiserfs_info(s, "switching to ordered data mode\n");
1095                 }
1096         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1097                 if (!reiserfs_data_writeback(s)) {
1098                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1099                         reiserfs_info(s, "switching to writeback data mode\n");
1100                 }
1101         }
1102 }
1103
1104 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1105 {
1106         int flush = (1 << REISERFS_BARRIER_FLUSH);
1107         int none = (1 << REISERFS_BARRIER_NONE);
1108         int all_barrier = flush | none;
1109
1110         if (bits & all_barrier) {
1111                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1112                 if (bits & flush) {
1113                         REISERFS_SB(s)->s_mount_opt |= flush;
1114                         printk("reiserfs: enabling write barrier flush mode\n");
1115                 } else if (bits & none) {
1116                         REISERFS_SB(s)->s_mount_opt |= none;
1117                         printk("reiserfs: write barriers turned off\n");
1118                 }
1119         }
1120 }
1121
1122 static void handle_attrs(struct super_block *s)
1123 {
1124         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1125
1126         if (reiserfs_attrs(s)) {
1127                 if (old_format_only(s)) {
1128                         reiserfs_warning(s, "super-6517", "cannot support "
1129                                          "attributes on 3.5.x disk format");
1130                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1131                         return;
1132                 }
1133                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1134                         reiserfs_warning(s, "super-6518", "cannot support "
1135                                          "attributes until flag is set in "
1136                                          "super-block");
1137                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1138                 }
1139         }
1140 }
1141
1142 #ifdef CONFIG_QUOTA
1143 static void handle_quota_files(struct super_block *s, char **qf_names,
1144                                unsigned int *qfmt)
1145 {
1146         int i;
1147
1148         for (i = 0; i < MAXQUOTAS; i++) {
1149                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1150                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1151                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1152         }
1153         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1154 }
1155 #endif
1156
1157 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1158 {
1159         struct reiserfs_super_block *rs;
1160         struct reiserfs_transaction_handle th;
1161         unsigned long blocks;
1162         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1163         unsigned long safe_mask = 0;
1164         unsigned int commit_max_age = (unsigned int)-1;
1165         struct reiserfs_journal *journal = SB_JOURNAL(s);
1166         char *new_opts = kstrdup(arg, GFP_KERNEL);
1167         int err;
1168         char *qf_names[MAXQUOTAS];
1169         unsigned int qfmt = 0;
1170 #ifdef CONFIG_QUOTA
1171         int i;
1172 #endif
1173
1174         reiserfs_write_lock(s);
1175
1176 #ifdef CONFIG_QUOTA
1177         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1178 #endif
1179
1180         rs = SB_DISK_SUPER_BLOCK(s);
1181
1182         if (!reiserfs_parse_options
1183             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1184             qf_names, &qfmt)) {
1185 #ifdef CONFIG_QUOTA
1186                 for (i = 0; i < MAXQUOTAS; i++)
1187                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1188                                 kfree(qf_names[i]);
1189 #endif
1190                 err = -EINVAL;
1191                 goto out_err;
1192         }
1193 #ifdef CONFIG_QUOTA
1194         handle_quota_files(s, qf_names, &qfmt);
1195 #endif
1196
1197         handle_attrs(s);
1198
1199         /* Add options that are safe here */
1200         safe_mask |= 1 << REISERFS_SMALLTAIL;
1201         safe_mask |= 1 << REISERFS_LARGETAIL;
1202         safe_mask |= 1 << REISERFS_NO_BORDER;
1203         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1204         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1205         safe_mask |= 1 << REISERFS_TEST4;
1206         safe_mask |= 1 << REISERFS_ATTRS;
1207         safe_mask |= 1 << REISERFS_XATTRS_USER;
1208         safe_mask |= 1 << REISERFS_POSIXACL;
1209         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1210         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1211         safe_mask |= 1 << REISERFS_ERROR_RO;
1212         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1213         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1214         safe_mask |= 1 << REISERFS_QUOTA;
1215
1216         /* Update the bitmask, taking care to keep
1217          * the bits we're not allowed to change here */
1218         REISERFS_SB(s)->s_mount_opt =
1219             (REISERFS_SB(s)->
1220              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1221
1222         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1223                 journal->j_max_commit_age = commit_max_age;
1224                 journal->j_max_trans_age = commit_max_age;
1225         } else if (commit_max_age == 0) {
1226                 /* 0 means restore defaults. */
1227                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1228                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1229         }
1230
1231         if (blocks) {
1232                 err = reiserfs_resize(s, blocks);
1233                 if (err != 0)
1234                         goto out_err;
1235         }
1236
1237         if (*mount_flags & MS_RDONLY) {
1238                 reiserfs_xattr_init(s, *mount_flags);
1239                 /* remount read-only */
1240                 if (s->s_flags & MS_RDONLY)
1241                         /* it is read-only already */
1242                         goto out_ok;
1243                 /* try to remount file system with read-only permissions */
1244                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1245                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1246                         goto out_ok;
1247                 }
1248
1249                 err = journal_begin(&th, s, 10);
1250                 if (err)
1251                         goto out_err;
1252
1253                 /* Mounting a rw partition read-only. */
1254                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1255                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1256                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1257         } else {
1258                 /* remount read-write */
1259                 if (!(s->s_flags & MS_RDONLY)) {
1260                         reiserfs_xattr_init(s, *mount_flags);
1261                         goto out_ok;    /* We are read-write already */
1262                 }
1263
1264                 if (reiserfs_is_journal_aborted(journal)) {
1265                         err = journal->j_errno;
1266                         goto out_err;
1267                 }
1268
1269                 handle_data_mode(s, mount_options);
1270                 handle_barrier_mode(s, mount_options);
1271                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1272                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1273                 err = journal_begin(&th, s, 10);
1274                 if (err)
1275                         goto out_err;
1276
1277                 /* Mount a partition which is read-only, read-write */
1278                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1279                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1280                 s->s_flags &= ~MS_RDONLY;
1281                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1282                 if (!old_format_only(s))
1283                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1284                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1285                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1286                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1287         }
1288         /* this will force a full flush of all journal lists */
1289         SB_JOURNAL(s)->j_must_wait = 1;
1290         err = journal_end(&th, s, 10);
1291         if (err)
1292                 goto out_err;
1293         s->s_dirt = 0;
1294
1295         if (!(*mount_flags & MS_RDONLY)) {
1296                 finish_unfinished(s);
1297                 reiserfs_xattr_init(s, *mount_flags);
1298         }
1299
1300 out_ok:
1301         replace_mount_options(s, new_opts);
1302         reiserfs_write_unlock(s);
1303         return 0;
1304
1305 out_err:
1306         kfree(new_opts);
1307         reiserfs_write_unlock(s);
1308         return err;
1309 }
1310
1311 static int read_super_block(struct super_block *s, int offset)
1312 {
1313         struct buffer_head *bh;
1314         struct reiserfs_super_block *rs;
1315         int fs_blocksize;
1316
1317         bh = sb_bread(s, offset / s->s_blocksize);
1318         if (!bh) {
1319                 reiserfs_warning(s, "sh-2006",
1320                                  "bread failed (dev %s, block %lu, size %lu)",
1321                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1322                                  s->s_blocksize);
1323                 return 1;
1324         }
1325
1326         rs = (struct reiserfs_super_block *)bh->b_data;
1327         if (!is_any_reiserfs_magic_string(rs)) {
1328                 brelse(bh);
1329                 return 1;
1330         }
1331         //
1332         // ok, reiserfs signature (old or new) found in at the given offset
1333         //
1334         fs_blocksize = sb_blocksize(rs);
1335         brelse(bh);
1336         sb_set_blocksize(s, fs_blocksize);
1337
1338         bh = sb_bread(s, offset / s->s_blocksize);
1339         if (!bh) {
1340                 reiserfs_warning(s, "sh-2007",
1341                                  "bread failed (dev %s, block %lu, size %lu)",
1342                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1343                                  s->s_blocksize);
1344                 return 1;
1345         }
1346
1347         rs = (struct reiserfs_super_block *)bh->b_data;
1348         if (sb_blocksize(rs) != s->s_blocksize) {
1349                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1350                                  "filesystem on (dev %s, block %Lu, size %lu)",
1351                                  reiserfs_bdevname(s),
1352                                  (unsigned long long)bh->b_blocknr,
1353                                  s->s_blocksize);
1354                 brelse(bh);
1355                 return 1;
1356         }
1357
1358         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1359                 brelse(bh);
1360                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1361                                  "--rebuild-tree run detected. Please run\n"
1362                                  "reiserfsck --rebuild-tree and wait for a "
1363                                  "completion. If that fails\n"
1364                                  "get newer reiserfsprogs package");
1365                 return 1;
1366         }
1367
1368         SB_BUFFER_WITH_SB(s) = bh;
1369         SB_DISK_SUPER_BLOCK(s) = rs;
1370
1371         if (is_reiserfs_jr(rs)) {
1372                 /* magic is of non-standard journal filesystem, look at s_version to
1373                    find which format is in use */
1374                 if (sb_version(rs) == REISERFS_VERSION_2)
1375                         reiserfs_info(s, "found reiserfs format \"3.6\""
1376                                       " with non-standard journal\n");
1377                 else if (sb_version(rs) == REISERFS_VERSION_1)
1378                         reiserfs_info(s, "found reiserfs format \"3.5\""
1379                                       " with non-standard journal\n");
1380                 else {
1381                         reiserfs_warning(s, "sh-2012", "found unknown "
1382                                          "format \"%u\" of reiserfs with "
1383                                          "non-standard magic", sb_version(rs));
1384                         return 1;
1385                 }
1386         } else
1387                 /* s_version of standard format may contain incorrect information,
1388                    so we just look at the magic string */
1389                 reiserfs_info(s,
1390                               "found reiserfs format \"%s\" with standard journal\n",
1391                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1392
1393         s->s_op = &reiserfs_sops;
1394         s->s_export_op = &reiserfs_export_ops;
1395 #ifdef CONFIG_QUOTA
1396         s->s_qcop = &reiserfs_qctl_operations;
1397         s->dq_op = &reiserfs_quota_operations;
1398 #endif
1399
1400         /* new format is limited by the 32 bit wide i_blocks field, want to
1401          ** be one full block below that.
1402          */
1403         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1404         return 0;
1405 }
1406
1407 /* after journal replay, reread all bitmap and super blocks */
1408 static int reread_meta_blocks(struct super_block *s)
1409 {
1410         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1411         reiserfs_write_unlock(s);
1412         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1413         reiserfs_write_lock(s);
1414         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1415                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1416                 return 1;
1417         }
1418
1419         return 0;
1420 }
1421
1422 /////////////////////////////////////////////////////
1423 // hash detection stuff
1424
1425 // if root directory is empty - we set default - Yura's - hash and
1426 // warn about it
1427 // FIXME: we look for only one name in a directory. If tea and yura
1428 // bith have the same value - we ask user to send report to the
1429 // mailing list
1430 static __u32 find_hash_out(struct super_block *s)
1431 {
1432         int retval;
1433         struct inode *inode;
1434         struct cpu_key key;
1435         INITIALIZE_PATH(path);
1436         struct reiserfs_dir_entry de;
1437         __u32 hash = DEFAULT_HASH;
1438
1439         inode = s->s_root->d_inode;
1440
1441         do {                    // Some serious "goto"-hater was there ;)
1442                 u32 teahash, r5hash, yurahash;
1443
1444                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1445                 retval = search_by_entry_key(s, &key, &path, &de);
1446                 if (retval == IO_ERROR) {
1447                         pathrelse(&path);
1448                         return UNSET_HASH;
1449                 }
1450                 if (retval == NAME_NOT_FOUND)
1451                         de.de_entry_num--;
1452                 set_de_name_and_namelen(&de);
1453                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1454                         /* allow override in this case */
1455                         if (reiserfs_rupasov_hash(s)) {
1456                                 hash = YURA_HASH;
1457                         }
1458                         reiserfs_info(s, "FS seems to be empty, autodetect "
1459                                          "is using the default hash\n");
1460                         break;
1461                 }
1462                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1463                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1464                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1465                 if (((teahash == r5hash)
1466                      &&
1467                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1468                       == r5hash)) || ((teahash == yurahash)
1469                                       && (yurahash ==
1470                                           GET_HASH_VALUE(deh_offset
1471                                                          (&
1472                                                           (de.
1473                                                            de_deh[de.
1474                                                                   de_entry_num])))))
1475                     || ((r5hash == yurahash)
1476                         && (yurahash ==
1477                             GET_HASH_VALUE(deh_offset
1478                                            (&(de.de_deh[de.de_entry_num])))))) {
1479                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1480                                          "automatically detect hash function. "
1481                                          "Please mount with -o "
1482                                          "hash={tea,rupasov,r5}");
1483                         hash = UNSET_HASH;
1484                         break;
1485                 }
1486                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1487                     yurahash)
1488                         hash = YURA_HASH;
1489                 else if (GET_HASH_VALUE
1490                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1491                         hash = TEA_HASH;
1492                 else if (GET_HASH_VALUE
1493                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1494                         hash = R5_HASH;
1495                 else {
1496                         reiserfs_warning(s, "reiserfs-2506",
1497                                          "Unrecognised hash function");
1498                         hash = UNSET_HASH;
1499                 }
1500         } while (0);
1501
1502         pathrelse(&path);
1503         return hash;
1504 }
1505
1506 // finds out which hash names are sorted with
1507 static int what_hash(struct super_block *s)
1508 {
1509         __u32 code;
1510
1511         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1512
1513         /* reiserfs_hash_detect() == true if any of the hash mount options
1514          ** were used.  We must check them to make sure the user isn't
1515          ** using a bad hash value
1516          */
1517         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1518                 code = find_hash_out(s);
1519
1520         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1521                 /* detection has found the hash, and we must check against the
1522                  ** mount options
1523                  */
1524                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1525                         reiserfs_warning(s, "reiserfs-2507",
1526                                          "Error, %s hash detected, "
1527                                          "unable to force rupasov hash",
1528                                          reiserfs_hashname(code));
1529                         code = UNSET_HASH;
1530                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1531                         reiserfs_warning(s, "reiserfs-2508",
1532                                          "Error, %s hash detected, "
1533                                          "unable to force tea hash",
1534                                          reiserfs_hashname(code));
1535                         code = UNSET_HASH;
1536                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1537                         reiserfs_warning(s, "reiserfs-2509",
1538                                          "Error, %s hash detected, "
1539                                          "unable to force r5 hash",
1540                                          reiserfs_hashname(code));
1541                         code = UNSET_HASH;
1542                 }
1543         } else {
1544                 /* find_hash_out was not called or could not determine the hash */
1545                 if (reiserfs_rupasov_hash(s)) {
1546                         code = YURA_HASH;
1547                 } else if (reiserfs_tea_hash(s)) {
1548                         code = TEA_HASH;
1549                 } else if (reiserfs_r5_hash(s)) {
1550                         code = R5_HASH;
1551                 }
1552         }
1553
1554         /* if we are mounted RW, and we have a new valid hash code, update
1555          ** the super
1556          */
1557         if (code != UNSET_HASH &&
1558             !(s->s_flags & MS_RDONLY) &&
1559             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1560                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1561         }
1562         return code;
1563 }
1564
1565 // return pointer to appropriate function
1566 static hashf_t hash_function(struct super_block *s)
1567 {
1568         switch (what_hash(s)) {
1569         case TEA_HASH:
1570                 reiserfs_info(s, "Using tea hash to sort names\n");
1571                 return keyed_hash;
1572         case YURA_HASH:
1573                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1574                 return yura_hash;
1575         case R5_HASH:
1576                 reiserfs_info(s, "Using r5 hash to sort names\n");
1577                 return r5_hash;
1578         }
1579         return NULL;
1580 }
1581
1582 // this is used to set up correct value for old partitions
1583 static int function2code(hashf_t func)
1584 {
1585         if (func == keyed_hash)
1586                 return TEA_HASH;
1587         if (func == yura_hash)
1588                 return YURA_HASH;
1589         if (func == r5_hash)
1590                 return R5_HASH;
1591
1592         BUG();                  // should never happen
1593
1594         return 0;
1595 }
1596
1597 #define SWARN(silent, s, id, ...)                       \
1598         if (!(silent))                          \
1599                 reiserfs_warning(s, id, __VA_ARGS__)
1600
1601 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1602 {
1603         struct inode *root_inode;
1604         struct reiserfs_transaction_handle th;
1605         int old_format = 0;
1606         unsigned long blocks;
1607         unsigned int commit_max_age = 0;
1608         int jinit_done = 0;
1609         struct reiserfs_iget_args args;
1610         struct reiserfs_super_block *rs;
1611         char *jdev_name;
1612         struct reiserfs_sb_info *sbi;
1613         int errval = -EINVAL;
1614         char *qf_names[MAXQUOTAS] = {};
1615         unsigned int qfmt = 0;
1616
1617         save_mount_options(s, data);
1618
1619         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1620         if (!sbi) {
1621                 errval = -ENOMEM;
1622                 goto error_alloc;
1623         }
1624         s->s_fs_info = sbi;
1625         /* Set default values for options: non-aggressive tails, RO on errors */
1626         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1627         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1628         /* no preallocation minimum, be smart in
1629            reiserfs_file_write instead */
1630         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1631         /* Preallocate by 16 blocks (17-1) at once */
1632         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1633         /* setup default block allocator options */
1634         reiserfs_init_alloc_options(s);
1635
1636         mutex_init(&REISERFS_SB(s)->lock);
1637         REISERFS_SB(s)->lock_depth = -1;
1638
1639         /*
1640          * This function is called with the bkl, which also was the old
1641          * locking used here.
1642          * do_journal_begin() will soon check if we hold the lock (ie: was the
1643          * bkl). This is likely because do_journal_begin() has several another
1644          * callers because at this time, it doesn't seem to be necessary to
1645          * protect against anything.
1646          * Anyway, let's be conservative and lock for now.
1647          */
1648         reiserfs_write_lock(s);
1649
1650         jdev_name = NULL;
1651         if (reiserfs_parse_options
1652             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1653              &commit_max_age, qf_names, &qfmt) == 0) {
1654                 goto error;
1655         }
1656 #ifdef CONFIG_QUOTA
1657         handle_quota_files(s, qf_names, &qfmt);
1658 #endif
1659
1660         if (blocks) {
1661                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1662                 goto error;
1663         }
1664
1665         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1666         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1667                 old_format = 1;
1668         /* try new format (64-th 1k block), which can contain reiserfs super block */
1669         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1670                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1671                       reiserfs_bdevname(s));
1672                 goto error;
1673         }
1674
1675         rs = SB_DISK_SUPER_BLOCK(s);
1676         /* Let's do basic sanity check to verify that underlying device is not
1677            smaller than the filesystem. If the check fails then abort and scream,
1678            because bad stuff will happen otherwise. */
1679         if (s->s_bdev && s->s_bdev->bd_inode
1680             && i_size_read(s->s_bdev->bd_inode) <
1681             sb_block_count(rs) * sb_blocksize(rs)) {
1682                 SWARN(silent, s, "", "Filesystem cannot be "
1683                       "mounted because it is bigger than the device");
1684                 SWARN(silent, s, "", "You may need to run fsck "
1685                       "or increase size of your LVM partition");
1686                 SWARN(silent, s, "", "Or may be you forgot to "
1687                       "reboot after fdisk when it told you to");
1688                 goto error;
1689         }
1690
1691         sbi->s_mount_state = SB_REISERFS_STATE(s);
1692         sbi->s_mount_state = REISERFS_VALID_FS;
1693
1694         if ((errval = reiserfs_init_bitmap_cache(s))) {
1695                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1696                 goto error;
1697         }
1698         errval = -EINVAL;
1699 #ifdef CONFIG_REISERFS_CHECK
1700         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1701         SWARN(silent, s, "", "- it is slow mode for debugging.");
1702 #endif
1703
1704         /* make data=ordered the default */
1705         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1706             !reiserfs_data_writeback(s)) {
1707                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1708         }
1709
1710         if (reiserfs_data_log(s)) {
1711                 reiserfs_info(s, "using journaled data mode\n");
1712         } else if (reiserfs_data_ordered(s)) {
1713                 reiserfs_info(s, "using ordered data mode\n");
1714         } else {
1715                 reiserfs_info(s, "using writeback data mode\n");
1716         }
1717         if (reiserfs_barrier_flush(s)) {
1718                 printk("reiserfs: using flush barriers\n");
1719         }
1720         // set_device_ro(s->s_dev, 1) ;
1721         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1722                 SWARN(silent, s, "sh-2022",
1723                       "unable to initialize journal space");
1724                 goto error;
1725         } else {
1726                 jinit_done = 1; /* once this is set, journal_release must be called
1727                                  ** if we error out of the mount
1728                                  */
1729         }
1730         if (reread_meta_blocks(s)) {
1731                 SWARN(silent, s, "jmacd-9",
1732                       "unable to reread meta blocks after journal init");
1733                 goto error;
1734         }
1735
1736         if (replay_only(s))
1737                 goto error;
1738
1739         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1740                 SWARN(silent, s, "clm-7000",
1741                       "Detected readonly device, marking FS readonly");
1742                 s->s_flags |= MS_RDONLY;
1743         }
1744         args.objectid = REISERFS_ROOT_OBJECTID;
1745         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1746         root_inode =
1747             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1748                          reiserfs_init_locked_inode, (void *)(&args));
1749         if (!root_inode) {
1750                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1751                 goto error;
1752         }
1753
1754         if (root_inode->i_state & I_NEW) {
1755                 reiserfs_read_locked_inode(root_inode, &args);
1756                 unlock_new_inode(root_inode);
1757         }
1758
1759         s->s_root = d_alloc_root(root_inode);
1760         if (!s->s_root) {
1761                 iput(root_inode);
1762                 goto error;
1763         }
1764         // define and initialize hash function
1765         sbi->s_hash_function = hash_function(s);
1766         if (sbi->s_hash_function == NULL) {
1767                 dput(s->s_root);
1768                 s->s_root = NULL;
1769                 goto error;
1770         }
1771
1772         if (is_reiserfs_3_5(rs)
1773             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1774                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1775         else if (old_format)
1776                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1777         else
1778                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1779
1780         if (!(s->s_flags & MS_RDONLY)) {
1781
1782                 errval = journal_begin(&th, s, 1);
1783                 if (errval) {
1784                         dput(s->s_root);
1785                         s->s_root = NULL;
1786                         goto error;
1787                 }
1788                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1789
1790                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1791                 set_sb_fs_state(rs, 0);
1792
1793                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1794                  * case, but older revisions can't. This will cause the
1795                  * file system to fail mount on those older implementations,
1796                  * avoiding corruption. -jeffm */
1797                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1798                     sb_bmap_nr(rs) != 0) {
1799                         reiserfs_warning(s, "super-2030", "This file system "
1800                                         "claims to use %u bitmap blocks in "
1801                                         "its super block, but requires %u. "
1802                                         "Clearing to zero.", sb_bmap_nr(rs),
1803                                         reiserfs_bmap_count(s));
1804
1805                         set_sb_bmap_nr(rs, 0);
1806                 }
1807
1808                 if (old_format_only(s)) {
1809                         /* filesystem of format 3.5 either with standard or non-standard
1810                            journal */
1811                         if (convert_reiserfs(s)) {
1812                                 /* and -o conv is given */
1813                                 if (!silent)
1814                                         reiserfs_info(s,
1815                                                       "converting 3.5 filesystem to the 3.6 format");
1816
1817                                 if (is_reiserfs_3_5(rs))
1818                                         /* put magic string of 3.6 format. 2.2 will not be able to
1819                                            mount this filesystem anymore */
1820                                         memcpy(rs->s_v1.s_magic,
1821                                                reiserfs_3_6_magic_string,
1822                                                sizeof
1823                                                (reiserfs_3_6_magic_string));
1824
1825                                 set_sb_version(rs, REISERFS_VERSION_2);
1826                                 reiserfs_convert_objectid_map_v1(s);
1827                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1828                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1829                         } else if (!silent) {
1830                                 reiserfs_info(s, "using 3.5.x disk format\n");
1831                         }
1832                 } else
1833                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1834
1835
1836                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1837                 errval = journal_end(&th, s, 1);
1838                 if (errval) {
1839                         dput(s->s_root);
1840                         s->s_root = NULL;
1841                         goto error;
1842                 }
1843
1844                 if ((errval = reiserfs_lookup_privroot(s)) ||
1845                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1846                         dput(s->s_root);
1847                         s->s_root = NULL;
1848                         goto error;
1849                 }
1850
1851                 /* look for files which were to be removed in previous session */
1852                 finish_unfinished(s);
1853         } else {
1854                 if (old_format_only(s) && !silent) {
1855                         reiserfs_info(s, "using 3.5.x disk format\n");
1856                 }
1857
1858                 if ((errval = reiserfs_lookup_privroot(s)) ||
1859                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1860                         dput(s->s_root);
1861                         s->s_root = NULL;
1862                         goto error;
1863                 }
1864         }
1865         // mark hash in super block: it could be unset. overwrite should be ok
1866         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1867
1868         handle_attrs(s);
1869
1870         reiserfs_proc_info_init(s);
1871
1872         init_waitqueue_head(&(sbi->s_wait));
1873         spin_lock_init(&sbi->bitmap_lock);
1874
1875         reiserfs_write_unlock(s);
1876
1877         return (0);
1878
1879 error:
1880         reiserfs_write_unlock(s);
1881 error_alloc:
1882         if (jinit_done) {       /* kill the commit thread, free journal ram */
1883                 journal_release_error(NULL, s);
1884         }
1885
1886         reiserfs_free_bitmap_cache(s);
1887         if (SB_BUFFER_WITH_SB(s))
1888                 brelse(SB_BUFFER_WITH_SB(s));
1889 #ifdef CONFIG_QUOTA
1890         {
1891                 int j;
1892                 for (j = 0; j < MAXQUOTAS; j++)
1893                         kfree(qf_names[j]);
1894         }
1895 #endif
1896         kfree(sbi);
1897
1898         s->s_fs_info = NULL;
1899         return errval;
1900 }
1901
1902 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1903 {
1904         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1905
1906         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1907         buf->f_bfree = sb_free_blocks(rs);
1908         buf->f_bavail = buf->f_bfree;
1909         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1910         buf->f_bsize = dentry->d_sb->s_blocksize;
1911         /* changed to accommodate gcc folks. */
1912         buf->f_type = REISERFS_SUPER_MAGIC;
1913         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1914         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1915                                 sizeof(rs->s_uuid)/2);
1916
1917         return 0;
1918 }
1919
1920 #ifdef CONFIG_QUOTA
1921 static int reiserfs_write_dquot(struct dquot *dquot)
1922 {
1923         struct reiserfs_transaction_handle th;
1924         int ret, err;
1925
1926         reiserfs_write_lock(dquot->dq_sb);
1927         ret =
1928             journal_begin(&th, dquot->dq_sb,
1929                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1930         if (ret)
1931                 goto out;
1932         ret = dquot_commit(dquot);
1933         err =
1934             journal_end(&th, dquot->dq_sb,
1935                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1936         if (!ret && err)
1937                 ret = err;
1938       out:
1939         reiserfs_write_unlock(dquot->dq_sb);
1940         return ret;
1941 }
1942
1943 static int reiserfs_acquire_dquot(struct dquot *dquot)
1944 {
1945         struct reiserfs_transaction_handle th;
1946         int ret, err;
1947
1948         reiserfs_write_lock(dquot->dq_sb);
1949         ret =
1950             journal_begin(&th, dquot->dq_sb,
1951                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1952         if (ret)
1953                 goto out;
1954         ret = dquot_acquire(dquot);
1955         err =
1956             journal_end(&th, dquot->dq_sb,
1957                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1958         if (!ret && err)
1959                 ret = err;
1960       out:
1961         reiserfs_write_unlock(dquot->dq_sb);
1962         return ret;
1963 }
1964
1965 static int reiserfs_release_dquot(struct dquot *dquot)
1966 {
1967         struct reiserfs_transaction_handle th;
1968         int ret, err;
1969
1970         reiserfs_write_lock(dquot->dq_sb);
1971         ret =
1972             journal_begin(&th, dquot->dq_sb,
1973                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1974         if (ret) {
1975                 /* Release dquot anyway to avoid endless cycle in dqput() */
1976                 dquot_release(dquot);
1977                 goto out;
1978         }
1979         ret = dquot_release(dquot);
1980         err =
1981             journal_end(&th, dquot->dq_sb,
1982                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1983         if (!ret && err)
1984                 ret = err;
1985       out:
1986         reiserfs_write_unlock(dquot->dq_sb);
1987         return ret;
1988 }
1989
1990 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1991 {
1992         /* Are we journaling quotas? */
1993         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1994             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1995                 dquot_mark_dquot_dirty(dquot);
1996                 return reiserfs_write_dquot(dquot);
1997         } else
1998                 return dquot_mark_dquot_dirty(dquot);
1999 }
2000
2001 static int reiserfs_write_info(struct super_block *sb, int type)
2002 {
2003         struct reiserfs_transaction_handle th;
2004         int ret, err;
2005
2006         /* Data block + inode block */
2007         reiserfs_write_lock(sb);
2008         ret = journal_begin(&th, sb, 2);
2009         if (ret)
2010                 goto out;
2011         ret = dquot_commit_info(sb, type);
2012         err = journal_end(&th, sb, 2);
2013         if (!ret && err)
2014                 ret = err;
2015       out:
2016         reiserfs_write_unlock(sb);
2017         return ret;
2018 }
2019
2020 /*
2021  * Turn on quotas during mount time - we need to find the quota file and such...
2022  */
2023 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2024 {
2025         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2026                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2027 }
2028
2029 /*
2030  * Standard function to be called on quota_on
2031  */
2032 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2033                              char *name, int remount)
2034 {
2035         int err;
2036         struct path path;
2037         struct inode *inode;
2038         struct reiserfs_transaction_handle th;
2039
2040         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2041                 return -EINVAL;
2042         /* No more checks needed? Path and format_id are bogus anyway... */
2043         if (remount)
2044                 return vfs_quota_on(sb, type, format_id, name, 1);
2045         err = kern_path(name, LOOKUP_FOLLOW, &path);
2046         if (err)
2047                 return err;
2048         /* Quotafile not on the same filesystem? */
2049         if (path.mnt->mnt_sb != sb) {
2050                 err = -EXDEV;
2051                 goto out;
2052         }
2053         inode = path.dentry->d_inode;
2054         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2055         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2056                 err = reiserfs_unpack(inode, NULL);
2057                 if (err) {
2058                         reiserfs_warning(sb, "super-6520",
2059                                 "Unpacking tail of quota file failed"
2060                                 " (%d). Cannot turn on quotas.", err);
2061                         err = -EINVAL;
2062                         goto out;
2063                 }
2064                 mark_inode_dirty(inode);
2065         }
2066         /* Journaling quota? */
2067         if (REISERFS_SB(sb)->s_qf_names[type]) {
2068                 /* Quotafile not of fs root? */
2069                 if (path.dentry->d_parent != sb->s_root)
2070                         reiserfs_warning(sb, "super-6521",
2071                                  "Quota file not on filesystem root. "
2072                                  "Journalled quota will not work.");
2073         }
2074
2075         /*
2076          * When we journal data on quota file, we have to flush journal to see
2077          * all updates to the file when we bypass pagecache...
2078          */
2079         if (reiserfs_file_data_log(inode)) {
2080                 /* Just start temporary transaction and finish it */
2081                 err = journal_begin(&th, sb, 1);
2082                 if (err)
2083                         goto out;
2084                 err = journal_end_sync(&th, sb, 1);
2085                 if (err)
2086                         goto out;
2087         }
2088         err = vfs_quota_on_path(sb, type, format_id, &path);
2089 out:
2090         path_put(&path);
2091         return err;
2092 }
2093
2094 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2095  * acquiring the locks... As quota files are never truncated and quota code
2096  * itself serializes the operations (and noone else should touch the files)
2097  * we don't have to be afraid of races */
2098 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2099                                    size_t len, loff_t off)
2100 {
2101         struct inode *inode = sb_dqopt(sb)->files[type];
2102         unsigned long blk = off >> sb->s_blocksize_bits;
2103         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2104         size_t toread;
2105         struct buffer_head tmp_bh, *bh;
2106         loff_t i_size = i_size_read(inode);
2107
2108         if (off > i_size)
2109                 return 0;
2110         if (off + len > i_size)
2111                 len = i_size - off;
2112         toread = len;
2113         while (toread > 0) {
2114                 tocopy =
2115                     sb->s_blocksize - offset <
2116                     toread ? sb->s_blocksize - offset : toread;
2117                 tmp_bh.b_state = 0;
2118                 /* Quota files are without tails so we can safely use this function */
2119                 reiserfs_write_lock(sb);
2120                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2121                 reiserfs_write_unlock(sb);
2122                 if (err)
2123                         return err;
2124                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2125                         memset(data, 0, tocopy);
2126                 else {
2127                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2128                         if (!bh)
2129                                 return -EIO;
2130                         memcpy(data, bh->b_data + offset, tocopy);
2131                         brelse(bh);
2132                 }
2133                 offset = 0;
2134                 toread -= tocopy;
2135                 data += tocopy;
2136                 blk++;
2137         }
2138         return len;
2139 }
2140
2141 /* Write to quotafile (we know the transaction is already started and has
2142  * enough credits) */
2143 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2144                                     const char *data, size_t len, loff_t off)
2145 {
2146         struct inode *inode = sb_dqopt(sb)->files[type];
2147         unsigned long blk = off >> sb->s_blocksize_bits;
2148         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2149         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2150         size_t towrite = len;
2151         struct buffer_head tmp_bh, *bh;
2152
2153         if (!current->journal_info) {
2154                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2155                         " cancelled because transaction is not started.\n",
2156                         (unsigned long long)off, (unsigned long long)len);
2157                 return -EIO;
2158         }
2159         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2160         while (towrite > 0) {
2161                 tocopy = sb->s_blocksize - offset < towrite ?
2162                     sb->s_blocksize - offset : towrite;
2163                 tmp_bh.b_state = 0;
2164                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2165                 if (err)
2166                         goto out;
2167                 if (offset || tocopy != sb->s_blocksize)
2168                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2169                 else
2170                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2171                 if (!bh) {
2172                         err = -EIO;
2173                         goto out;
2174                 }
2175                 lock_buffer(bh);
2176                 memcpy(bh->b_data + offset, data, tocopy);
2177                 flush_dcache_page(bh->b_page);
2178                 set_buffer_uptodate(bh);
2179                 unlock_buffer(bh);
2180                 reiserfs_prepare_for_journal(sb, bh, 1);
2181                 journal_mark_dirty(current->journal_info, sb, bh);
2182                 if (!journal_quota)
2183                         reiserfs_add_ordered_list(inode, bh);
2184                 brelse(bh);
2185                 offset = 0;
2186                 towrite -= tocopy;
2187                 data += tocopy;
2188                 blk++;
2189         }
2190 out:
2191         if (len == towrite) {
2192                 mutex_unlock(&inode->i_mutex);
2193                 return err;
2194         }
2195         if (inode->i_size < off + len - towrite)
2196                 i_size_write(inode, off + len - towrite);
2197         inode->i_version++;
2198         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2199         mark_inode_dirty(inode);
2200         mutex_unlock(&inode->i_mutex);
2201         return len - towrite;
2202 }
2203
2204 #endif
2205
2206 static int get_super_block(struct file_system_type *fs_type,
2207                            int flags, const char *dev_name,
2208                            void *data, struct vfsmount *mnt)
2209 {
2210         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2211                            mnt);
2212 }
2213
2214 static int __init init_reiserfs_fs(void)
2215 {
2216         int ret;
2217
2218         if ((ret = init_inodecache())) {
2219                 return ret;
2220         }
2221
2222         reiserfs_proc_info_global_init();
2223
2224         ret = register_filesystem(&reiserfs_fs_type);
2225
2226         if (ret == 0) {
2227                 return 0;
2228         }
2229
2230         reiserfs_proc_info_global_done();
2231         destroy_inodecache();
2232
2233         return ret;
2234 }
2235
2236 static void __exit exit_reiserfs_fs(void)
2237 {
2238         reiserfs_proc_info_global_done();
2239         unregister_filesystem(&reiserfs_fs_type);
2240         destroy_inodecache();
2241 }
2242
2243 struct file_system_type reiserfs_fs_type = {
2244         .owner = THIS_MODULE,
2245         .name = "reiserfs",
2246         .get_sb = get_super_block,
2247         .kill_sb = reiserfs_kill_sb,
2248         .fs_flags = FS_REQUIRES_DEV,
2249 };
2250
2251 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2252 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2253 MODULE_LICENSE("GPL");
2254
2255 module_init(init_reiserfs_fs);
2256 module_exit(exit_reiserfs_fs);