reiserfs: kill-the-BKL
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/crc32.h>
30 #include <linux/smp_lock.h>
31
32 struct file_system_type reiserfs_fs_type;
33
34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
37
38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
39 {
40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
41                         strlen(reiserfs_3_5_magic_string));
42 }
43
44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
45 {
46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
47                         strlen(reiserfs_3_6_magic_string));
48 }
49
50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
51 {
52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
53                         strlen(reiserfs_jr_magic_string));
54 }
55
56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
57 {
58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
59                 is_reiserfs_jr(rs));
60 }
61
62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
64
65 static int reiserfs_sync_fs(struct super_block *s, int wait)
66 {
67         struct reiserfs_transaction_handle th;
68
69         reiserfs_write_lock(s);
70         if (!journal_begin(&th, s, 1))
71                 if (!journal_end_sync(&th, s, 1))
72                         reiserfs_flush_old_commits(s);
73         s->s_dirt = 0;  /* Even if it's not true.
74                          * We'll loop forever in sync_supers otherwise */
75         reiserfs_write_unlock(s);
76         return 0;
77 }
78
79 static void reiserfs_write_super(struct super_block *s)
80 {
81         reiserfs_sync_fs(s, 1);
82 }
83
84 static int reiserfs_freeze(struct super_block *s)
85 {
86         struct reiserfs_transaction_handle th;
87         reiserfs_write_lock(s);
88         if (!(s->s_flags & MS_RDONLY)) {
89                 int err = journal_begin(&th, s, 1);
90                 if (err) {
91                         reiserfs_block_writes(&th);
92                 } else {
93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
94                                                      1);
95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
96                         reiserfs_block_writes(&th);
97                         journal_end_sync(&th, s, 1);
98                 }
99         }
100         s->s_dirt = 0;
101         reiserfs_write_unlock(s);
102         return 0;
103 }
104
105 static int reiserfs_unfreeze(struct super_block *s)
106 {
107         reiserfs_allow_writes(s);
108         return 0;
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114    file it points to. It can either happen if unlink is completed but
115    "save unlink" removal, or if file has both unlink and truncate
116    pending and as unlink completes first (because key of "save link"
117    protecting unlink is bigger that a key lf "save link" which
118    protects truncate), so there left no items to make truncate
119    completion on */
120 static int remove_save_link_only(struct super_block *s,
121                                  struct reiserfs_key *key, int oid_free)
122 {
123         struct reiserfs_transaction_handle th;
124         int err;
125
126         /* we are going to do one balancing */
127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128         if (err)
129                 return err;
130
131         reiserfs_delete_solid_item(&th, NULL, key);
132         if (oid_free)
133                 /* removals are protected by direct items */
134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146         INITIALIZE_PATH(path);
147         struct cpu_key max_cpu_key, obj_key;
148         struct reiserfs_key save_link_key, last_inode_key;
149         int retval = 0;
150         struct item_head *ih;
151         struct buffer_head *bh;
152         int item_pos;
153         char *item;
154         int done;
155         struct inode *inode;
156         int truncate;
157 #ifdef CONFIG_QUOTA
158         int i;
159         int ms_active_set;
160 #endif
161
162         /* compose key to look for "save" links */
163         max_cpu_key.version = KEY_FORMAT_3_5;
164         max_cpu_key.on_disk_key.k_dir_id = ~0U;
165         max_cpu_key.on_disk_key.k_objectid = ~0U;
166         set_cpu_key_k_offset(&max_cpu_key, ~0U);
167         max_cpu_key.key_length = 3;
168
169         memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172         /* Needed for iput() to work correctly and not trash data */
173         if (s->s_flags & MS_ACTIVE) {
174                 ms_active_set = 0;
175         } else {
176                 ms_active_set = 1;
177                 s->s_flags |= MS_ACTIVE;
178         }
179         /* Turn on quotas so that they are updated correctly */
180         for (i = 0; i < MAXQUOTAS; i++) {
181                 if (REISERFS_SB(s)->s_qf_names[i]) {
182                         int ret = reiserfs_quota_on_mount(s, i);
183                         if (ret < 0)
184                                 reiserfs_warning(s, "reiserfs-2500",
185                                                  "cannot turn on journaled "
186                                                  "quota: error %d", ret);
187                 }
188         }
189 #endif
190
191         done = 0;
192         REISERFS_SB(s)->s_is_unlinked_ok = 1;
193         while (!retval) {
194                 retval = search_item(s, &max_cpu_key, &path);
195                 if (retval != ITEM_NOT_FOUND) {
196                         reiserfs_error(s, "vs-2140",
197                                        "search_by_key returned %d", retval);
198                         break;
199                 }
200
201                 bh = get_last_bh(&path);
202                 item_pos = get_item_pos(&path);
203                 if (item_pos != B_NR_ITEMS(bh)) {
204                         reiserfs_warning(s, "vs-2060",
205                                          "wrong position found");
206                         break;
207                 }
208                 item_pos--;
209                 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212                         /* there are no "save" links anymore */
213                         break;
214
215                 save_link_key = ih->ih_key;
216                 if (is_indirect_le_ih(ih))
217                         truncate = 1;
218                 else
219                         truncate = 0;
220
221                 /* reiserfs_iget needs k_dirid and k_objectid only */
222                 item = B_I_PITEM(bh, ih);
223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224                 obj_key.on_disk_key.k_objectid =
225                     le32_to_cpu(ih->ih_key.k_objectid);
226                 obj_key.on_disk_key.k_offset = 0;
227                 obj_key.on_disk_key.k_type = 0;
228
229                 pathrelse(&path);
230
231                 inode = reiserfs_iget(s, &obj_key);
232                 if (!inode) {
233                         /* the unlink almost completed, it just did not manage to remove
234                            "save" link and release objectid */
235                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
236                                          &obj_key);
237                         retval = remove_save_link_only(s, &save_link_key, 1);
238                         continue;
239                 }
240
241                 if (!truncate && inode->i_nlink) {
242                         /* file is not unlinked */
243                         reiserfs_warning(s, "vs-2185",
244                                          "file %K is not unlinked",
245                                          &obj_key);
246                         retval = remove_save_link_only(s, &save_link_key, 0);
247                         continue;
248                 }
249                 vfs_dq_init(inode);
250
251                 if (truncate && S_ISDIR(inode->i_mode)) {
252                         /* We got a truncate request for a dir which is impossible.
253                            The only imaginable way is to execute unfinished truncate request
254                            then boot into old kernel, remove the file and create dir with
255                            the same key. */
256                         reiserfs_warning(s, "green-2101",
257                                          "impossible truncate on a "
258                                          "directory %k. Please report",
259                                          INODE_PKEY(inode));
260                         retval = remove_save_link_only(s, &save_link_key, 0);
261                         truncate = 0;
262                         iput(inode);
263                         continue;
264                 }
265
266                 if (truncate) {
267                         REISERFS_I(inode)->i_flags |=
268                             i_link_saved_truncate_mask;
269                         /* not completed truncate found. New size was committed together
270                            with "save" link */
271                         reiserfs_info(s, "Truncating %k to %Ld ..",
272                                       INODE_PKEY(inode), inode->i_size);
273                         reiserfs_truncate_file(inode,
274                                                0
275                                                /*don't update modification time */
276                                                );
277                         retval = remove_save_link(inode, truncate);
278                 } else {
279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280                         /* not completed unlink (rmdir) found */
281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
283                                         sizeof(last_inode_key))){
284                                 last_inode_key = *INODE_PKEY(inode);
285                                 /* removal gets completed in iput */
286                                 retval = 0;
287                         } else {
288                                 reiserfs_warning(s, "super-2189", "Dead loop "
289                                                  "in finish_unfinished "
290                                                  "detected, just remove "
291                                                  "save link\n");
292                                 retval = remove_save_link_only(s,
293                                                         &save_link_key, 0);
294                         }
295                 }
296
297                 iput(inode);
298                 printk("done\n");
299                 done++;
300         }
301         REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304         /* Turn quotas off */
305         for (i = 0; i < MAXQUOTAS; i++) {
306                 if (sb_dqopt(s)->files[i])
307                         vfs_quota_off(s, i, 0);
308         }
309         if (ms_active_set)
310                 /* Restore the flag back */
311                 s->s_flags &= ~MS_ACTIVE;
312 #endif
313         pathrelse(&path);
314         if (done)
315                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316                               "Completed\n", done);
317         return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321    being unlinked. This link will be deleted in the same transaction with last
322    item of file. mounting the filesystem we scan all these links and remove
323    files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325                    struct inode *inode, int truncate)
326 {
327         INITIALIZE_PATH(path);
328         int retval;
329         struct cpu_key key;
330         struct item_head ih;
331         __le32 link;
332
333         BUG_ON(!th->t_trans_id);
334
335         /* file can only get one "save link" of each kind */
336         RFALSE(truncate &&
337                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338                "saved link already exists for truncated inode %lx",
339                (long)inode->i_ino);
340         RFALSE(!truncate &&
341                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342                "saved link already exists for unlinked inode %lx",
343                (long)inode->i_ino);
344
345         /* setup key of "save" link */
346         key.version = KEY_FORMAT_3_5;
347         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348         key.on_disk_key.k_objectid = inode->i_ino;
349         if (!truncate) {
350                 /* unlink, rmdir, rename */
351                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352                 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354                 /* item head of "safe" link */
355                 make_le_item_head(&ih, &key, key.version,
356                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357                                   4 /*length */ , 0xffff /*free space */ );
358         } else {
359                 /* truncate */
360                 if (S_ISDIR(inode->i_mode))
361                         reiserfs_warning(inode->i_sb, "green-2102",
362                                          "Adding a truncate savelink for "
363                                          "a directory %k! Please report",
364                                          INODE_PKEY(inode));
365                 set_cpu_key_k_offset(&key, 1);
366                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
367
368                 /* item head of "safe" link */
369                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
370                                   4 /*length */ , 0 /*free space */ );
371         }
372         key.key_length = 3;
373
374         /* look for its place in the tree */
375         retval = search_item(inode->i_sb, &key, &path);
376         if (retval != ITEM_NOT_FOUND) {
377                 if (retval != -ENOSPC)
378                         reiserfs_error(inode->i_sb, "vs-2100",
379                                        "search_by_key (%K) returned %d", &key,
380                                        retval);
381                 pathrelse(&path);
382                 return;
383         }
384
385         /* body of "save" link */
386         link = INODE_PKEY(inode)->k_dir_id;
387
388         /* put "save" link inot tree, don't charge quota to anyone */
389         retval =
390             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
391         if (retval) {
392                 if (retval != -ENOSPC)
393                         reiserfs_error(inode->i_sb, "vs-2120",
394                                        "insert_item returned %d", retval);
395         } else {
396                 if (truncate)
397                         REISERFS_I(inode)->i_flags |=
398                             i_link_saved_truncate_mask;
399                 else
400                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401         }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407         struct reiserfs_transaction_handle th;
408         struct reiserfs_key key;
409         int err;
410
411         /* we are going to do one balancing only */
412         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413         if (err)
414                 return err;
415
416         /* setup key of "save" link */
417         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418         key.k_objectid = INODE_PKEY(inode)->k_objectid;
419         if (!truncate) {
420                 /* unlink, rmdir, rename */
421                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422                                     1 + inode->i_sb->s_blocksize);
423                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424         } else {
425                 /* truncate */
426                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428         }
429
430         if ((truncate &&
431              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432             (!truncate &&
433              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434                 /* don't take quota bytes from anywhere */
435                 reiserfs_delete_solid_item(&th, NULL, &key);
436         if (!truncate) {
437                 reiserfs_release_objectid(&th, inode->i_ino);
438                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439         } else
440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447         if (REISERFS_SB(s)) {
448                 if (REISERFS_SB(s)->xattr_root) {
449                         d_invalidate(REISERFS_SB(s)->xattr_root);
450                         dput(REISERFS_SB(s)->xattr_root);
451                         REISERFS_SB(s)->xattr_root = NULL;
452                 }
453                 if (REISERFS_SB(s)->priv_root) {
454                         d_invalidate(REISERFS_SB(s)->priv_root);
455                         dput(REISERFS_SB(s)->priv_root);
456                         REISERFS_SB(s)->priv_root = NULL;
457                 }
458         }
459
460         kill_block_super(s);
461 }
462
463 static void reiserfs_put_super(struct super_block *s)
464 {
465         struct reiserfs_transaction_handle th;
466         th.t_trans_id = 0;
467
468         reiserfs_write_lock(s);
469
470         if (s->s_dirt)
471                 reiserfs_write_super(s);
472
473         /* change file system state to current state if it was mounted with read-write permissions */
474         if (!(s->s_flags & MS_RDONLY)) {
475                 if (!journal_begin(&th, s, 10)) {
476                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
477                                                      1);
478                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
479                                             REISERFS_SB(s)->s_mount_state);
480                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
481                 }
482         }
483
484         /* note, journal_release checks for readonly mount, and can decide not
485          ** to do a journal_end
486          */
487         journal_release(&th, s);
488
489         reiserfs_free_bitmap_cache(s);
490
491         brelse(SB_BUFFER_WITH_SB(s));
492
493         print_statistics(s);
494
495         if (REISERFS_SB(s)->reserved_blocks != 0) {
496                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
497                                  REISERFS_SB(s)->reserved_blocks);
498         }
499
500         reiserfs_proc_info_done(s);
501
502         reiserfs_write_unlock(s);
503         mutex_destroy(&REISERFS_SB(s)->lock);
504         kfree(s->s_fs_info);
505         s->s_fs_info = NULL;
506 }
507
508 static struct kmem_cache *reiserfs_inode_cachep;
509
510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
511 {
512         struct reiserfs_inode_info *ei;
513         ei = (struct reiserfs_inode_info *)
514             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
515         if (!ei)
516                 return NULL;
517         return &ei->vfs_inode;
518 }
519
520 static void reiserfs_destroy_inode(struct inode *inode)
521 {
522         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
523 }
524
525 static void init_once(void *foo)
526 {
527         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
528
529         INIT_LIST_HEAD(&ei->i_prealloc_list);
530         inode_init_once(&ei->vfs_inode);
531 }
532
533 static int init_inodecache(void)
534 {
535         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
536                                                   sizeof(struct
537                                                          reiserfs_inode_info),
538                                                   0, (SLAB_RECLAIM_ACCOUNT|
539                                                         SLAB_MEM_SPREAD),
540                                                   init_once);
541         if (reiserfs_inode_cachep == NULL)
542                 return -ENOMEM;
543         return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548         kmem_cache_destroy(reiserfs_inode_cachep);
549 }
550
551 /* we don't mark inodes dirty, we just log them */
552 static void reiserfs_dirty_inode(struct inode *inode)
553 {
554         struct reiserfs_transaction_handle th;
555
556         int err = 0;
557         if (inode->i_sb->s_flags & MS_RDONLY) {
558                 reiserfs_warning(inode->i_sb, "clm-6006",
559                                  "writing inode %lu on readonly FS",
560                                  inode->i_ino);
561                 return;
562         }
563         reiserfs_write_lock(inode->i_sb);
564
565         /* this is really only used for atime updates, so they don't have
566          ** to be included in O_SYNC or fsync
567          */
568         err = journal_begin(&th, inode->i_sb, 1);
569         if (err) {
570                 reiserfs_write_unlock(inode->i_sb);
571                 return;
572         }
573         reiserfs_update_sd(&th, inode);
574         journal_end(&th, inode->i_sb, 1);
575         reiserfs_write_unlock(inode->i_sb);
576 }
577
578 #ifdef CONFIG_QUOTA
579 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
580                                     size_t, loff_t);
581 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
582                                    loff_t);
583 #endif
584
585 static const struct super_operations reiserfs_sops = {
586         .alloc_inode = reiserfs_alloc_inode,
587         .destroy_inode = reiserfs_destroy_inode,
588         .write_inode = reiserfs_write_inode,
589         .dirty_inode = reiserfs_dirty_inode,
590         .delete_inode = reiserfs_delete_inode,
591         .put_super = reiserfs_put_super,
592         .write_super = reiserfs_write_super,
593         .sync_fs = reiserfs_sync_fs,
594         .freeze_fs = reiserfs_freeze,
595         .unfreeze_fs = reiserfs_unfreeze,
596         .statfs = reiserfs_statfs,
597         .remount_fs = reiserfs_remount,
598         .show_options = generic_show_options,
599 #ifdef CONFIG_QUOTA
600         .quota_read = reiserfs_quota_read,
601         .quota_write = reiserfs_quota_write,
602 #endif
603 };
604
605 #ifdef CONFIG_QUOTA
606 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
607
608 static int reiserfs_write_dquot(struct dquot *);
609 static int reiserfs_acquire_dquot(struct dquot *);
610 static int reiserfs_release_dquot(struct dquot *);
611 static int reiserfs_mark_dquot_dirty(struct dquot *);
612 static int reiserfs_write_info(struct super_block *, int);
613 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
614
615 static struct dquot_operations reiserfs_quota_operations = {
616         .initialize = dquot_initialize,
617         .drop = dquot_drop,
618         .alloc_space = dquot_alloc_space,
619         .alloc_inode = dquot_alloc_inode,
620         .free_space = dquot_free_space,
621         .free_inode = dquot_free_inode,
622         .transfer = dquot_transfer,
623         .write_dquot = reiserfs_write_dquot,
624         .acquire_dquot = reiserfs_acquire_dquot,
625         .release_dquot = reiserfs_release_dquot,
626         .mark_dirty = reiserfs_mark_dquot_dirty,
627         .write_info = reiserfs_write_info,
628         .alloc_dquot    = dquot_alloc,
629         .destroy_dquot  = dquot_destroy,
630 };
631
632 static struct quotactl_ops reiserfs_qctl_operations = {
633         .quota_on = reiserfs_quota_on,
634         .quota_off = vfs_quota_off,
635         .quota_sync = vfs_quota_sync,
636         .get_info = vfs_get_dqinfo,
637         .set_info = vfs_set_dqinfo,
638         .get_dqblk = vfs_get_dqblk,
639         .set_dqblk = vfs_set_dqblk,
640 };
641 #endif
642
643 static const struct export_operations reiserfs_export_ops = {
644         .encode_fh = reiserfs_encode_fh,
645         .fh_to_dentry = reiserfs_fh_to_dentry,
646         .fh_to_parent = reiserfs_fh_to_parent,
647         .get_parent = reiserfs_get_parent,
648 };
649
650 /* this struct is used in reiserfs_getopt () for containing the value for those
651    mount options that have values rather than being toggles. */
652 typedef struct {
653         char *value;
654         int setmask;            /* bitmask which is to set on mount_options bitmask when this
655                                    value is found, 0 is no bits are to be changed. */
656         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
657                                    value is found, 0 is no bits are to be changed. This is
658                                    applied BEFORE setmask */
659 } arg_desc_t;
660
661 /* Set this bit in arg_required to allow empty arguments */
662 #define REISERFS_OPT_ALLOWEMPTY 31
663
664 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
665    mount options */
666 typedef struct {
667         char *option_name;
668         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
669         const arg_desc_t *values;       /* list of values accepted by an option */
670         int setmask;            /* bitmask which is to set on mount_options bitmask when this
671                                    value is found, 0 is no bits are to be changed. */
672         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
673                                    value is found, 0 is no bits are to be changed. This is
674                                    applied BEFORE setmask */
675 } opt_desc_t;
676
677 /* possible values for -o data= */
678 static const arg_desc_t logging_mode[] = {
679         {"ordered", 1 << REISERFS_DATA_ORDERED,
680          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
681         {"journal", 1 << REISERFS_DATA_LOG,
682          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
683         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
684          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
685         {.value = NULL}
686 };
687
688 /* possible values for -o barrier= */
689 static const arg_desc_t barrier_mode[] = {
690         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
691         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
692         {.value = NULL}
693 };
694
695 /* possible values for "-o block-allocator=" and bits which are to be set in
696    s_mount_opt of reiserfs specific part of in-core super block */
697 static const arg_desc_t balloc[] = {
698         {"noborder", 1 << REISERFS_NO_BORDER, 0},
699         {"border", 0, 1 << REISERFS_NO_BORDER},
700         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
701         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
702         {"test4", 1 << REISERFS_TEST4, 0},
703         {"notest4", 0, 1 << REISERFS_TEST4},
704         {NULL, 0, 0}
705 };
706
707 static const arg_desc_t tails[] = {
708         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
709         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
710         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
711         {NULL, 0, 0}
712 };
713
714 static const arg_desc_t error_actions[] = {
715         {"panic", 1 << REISERFS_ERROR_PANIC,
716          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
717         {"ro-remount", 1 << REISERFS_ERROR_RO,
718          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
719 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
720         {"continue", 1 << REISERFS_ERROR_CONTINUE,
721          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
722 #endif
723         {NULL, 0, 0},
724 };
725
726 /* proceed only one option from a list *cur - string containing of mount options
727    opts - array of options which are accepted
728    opt_arg - if option is found and requires an argument and if it is specifed
729    in the input - pointer to the argument is stored here
730    bit_flags - if option requires to set a certain bit - it is set here
731    return -1 if unknown option is found, opt->arg_required otherwise */
732 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
733                            char **opt_arg, unsigned long *bit_flags)
734 {
735         char *p;
736         /* foo=bar,
737            ^   ^  ^
738            |   |  +-- option_end
739            |   +-- arg_start
740            +-- option_start
741          */
742         const opt_desc_t *opt;
743         const arg_desc_t *arg;
744
745         p = *cur;
746
747         /* assume argument cannot contain commas */
748         *cur = strchr(p, ',');
749         if (*cur) {
750                 *(*cur) = '\0';
751                 (*cur)++;
752         }
753
754         if (!strncmp(p, "alloc=", 6)) {
755                 /* Ugly special case, probably we should redo options parser so that
756                    it can understand several arguments for some options, also so that
757                    it can fill several bitfields with option values. */
758                 if (reiserfs_parse_alloc_options(s, p + 6)) {
759                         return -1;
760                 } else {
761                         return 0;
762                 }
763         }
764
765         /* for every option in the list */
766         for (opt = opts; opt->option_name; opt++) {
767                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
768                         if (bit_flags) {
769                                 if (opt->clrmask ==
770                                     (1 << REISERFS_UNSUPPORTED_OPT))
771                                         reiserfs_warning(s, "super-6500",
772                                                          "%s not supported.\n",
773                                                          p);
774                                 else
775                                         *bit_flags &= ~opt->clrmask;
776                                 if (opt->setmask ==
777                                     (1 << REISERFS_UNSUPPORTED_OPT))
778                                         reiserfs_warning(s, "super-6501",
779                                                          "%s not supported.\n",
780                                                          p);
781                                 else
782                                         *bit_flags |= opt->setmask;
783                         }
784                         break;
785                 }
786         }
787         if (!opt->option_name) {
788                 reiserfs_warning(s, "super-6502",
789                                  "unknown mount option \"%s\"", p);
790                 return -1;
791         }
792
793         p += strlen(opt->option_name);
794         switch (*p) {
795         case '=':
796                 if (!opt->arg_required) {
797                         reiserfs_warning(s, "super-6503",
798                                          "the option \"%s\" does not "
799                                          "require an argument\n",
800                                          opt->option_name);
801                         return -1;
802                 }
803                 break;
804
805         case 0:
806                 if (opt->arg_required) {
807                         reiserfs_warning(s, "super-6504",
808                                          "the option \"%s\" requires an "
809                                          "argument\n", opt->option_name);
810                         return -1;
811                 }
812                 break;
813         default:
814                 reiserfs_warning(s, "super-6505",
815                                  "head of option \"%s\" is only correct\n",
816                                  opt->option_name);
817                 return -1;
818         }
819
820         /* move to the argument, or to next option if argument is not required */
821         p++;
822
823         if (opt->arg_required
824             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
825             && !strlen(p)) {
826                 /* this catches "option=," if not allowed */
827                 reiserfs_warning(s, "super-6506",
828                                  "empty argument for \"%s\"\n",
829                                  opt->option_name);
830                 return -1;
831         }
832
833         if (!opt->values) {
834                 /* *=NULLopt_arg contains pointer to argument */
835                 *opt_arg = p;
836                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
837         }
838
839         /* values possible for this option are listed in opt->values */
840         for (arg = opt->values; arg->value; arg++) {
841                 if (!strcmp(p, arg->value)) {
842                         if (bit_flags) {
843                                 *bit_flags &= ~arg->clrmask;
844                                 *bit_flags |= arg->setmask;
845                         }
846                         return opt->arg_required;
847                 }
848         }
849
850         reiserfs_warning(s, "super-6506",
851                          "bad value \"%s\" for option \"%s\"\n", p,
852                          opt->option_name);
853         return -1;
854 }
855
856 /* returns 0 if something is wrong in option string, 1 - otherwise */
857 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
858                                   unsigned long *mount_options,
859                                   /* after the parsing phase, contains the
860                                      collection of bitflags defining what
861                                      mount options were selected. */
862                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
863                                   char **jdev_name,
864                                   unsigned int *commit_max_age,
865                                   char **qf_names,
866                                   unsigned int *qfmt)
867 {
868         int c;
869         char *arg = NULL;
870         char *pos;
871         opt_desc_t opts[] = {
872                 /* Compatibility stuff, so that -o notail for old setups still work */
873                 {"tails",.arg_required = 't',.values = tails},
874                 {"notail",.clrmask =
875                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
876                 {"conv",.setmask = 1 << REISERFS_CONVERT},
877                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
878                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
879                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
880 #ifdef CONFIG_REISERFS_FS_XATTR
881                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
882                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
883 #else
884                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
885                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
886 #endif
887 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
888                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
889                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
890 #else
891                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
892                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
893 #endif
894                 {.option_name = "nolog"},
895                 {"replayonly",.setmask = 1 << REPLAYONLY},
896                 {"block-allocator",.arg_required = 'a',.values = balloc},
897                 {"data",.arg_required = 'd',.values = logging_mode},
898                 {"barrier",.arg_required = 'b',.values = barrier_mode},
899                 {"resize",.arg_required = 'r',.values = NULL},
900                 {"jdev",.arg_required = 'j',.values = NULL},
901                 {"nolargeio",.arg_required = 'w',.values = NULL},
902                 {"commit",.arg_required = 'c',.values = NULL},
903                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
904                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
905                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
906                 {"errors",.arg_required = 'e',.values = error_actions},
907                 {"usrjquota",.arg_required =
908                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
909                 {"grpjquota",.arg_required =
910                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
911                 {"jqfmt",.arg_required = 'f',.values = NULL},
912                 {.option_name = NULL}
913         };
914
915         *blocks = 0;
916         if (!options || !*options)
917                 /* use default configuration: create tails, journaling on, no
918                    conversion to newest format */
919                 return 1;
920
921         for (pos = options; pos;) {
922                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
923                 if (c == -1)
924                         /* wrong option is given */
925                         return 0;
926
927                 if (c == 'r') {
928                         char *p;
929
930                         p = NULL;
931                         /* "resize=NNN" or "resize=auto" */
932
933                         if (!strcmp(arg, "auto")) {
934                                 /* From JFS code, to auto-get the size. */
935                                 *blocks =
936                                     s->s_bdev->bd_inode->i_size >> s->
937                                     s_blocksize_bits;
938                         } else {
939                                 *blocks = simple_strtoul(arg, &p, 0);
940                                 if (*p != '\0') {
941                                         /* NNN does not look like a number */
942                                         reiserfs_warning(s, "super-6507",
943                                                          "bad value %s for "
944                                                          "-oresize\n", arg);
945                                         return 0;
946                                 }
947                         }
948                 }
949
950                 if (c == 'c') {
951                         char *p = NULL;
952                         unsigned long val = simple_strtoul(arg, &p, 0);
953                         /* commit=NNN (time in seconds) */
954                         if (*p != '\0' || val >= (unsigned int)-1) {
955                                 reiserfs_warning(s, "super-6508",
956                                                  "bad value %s for -ocommit\n",
957                                                  arg);
958                                 return 0;
959                         }
960                         *commit_max_age = (unsigned int)val;
961                 }
962
963                 if (c == 'w') {
964                         reiserfs_warning(s, "super-6509", "nolargeio option "
965                                          "is no longer supported");
966                         return 0;
967                 }
968
969                 if (c == 'j') {
970                         if (arg && *arg && jdev_name) {
971                                 if (*jdev_name) {       //Hm, already assigned?
972                                         reiserfs_warning(s, "super-6510",
973                                                          "journal device was "
974                                                          "already specified to "
975                                                          "be %s", *jdev_name);
976                                         return 0;
977                                 }
978                                 *jdev_name = arg;
979                         }
980                 }
981 #ifdef CONFIG_QUOTA
982                 if (c == 'u' || c == 'g') {
983                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
984
985                         if (sb_any_quota_loaded(s) &&
986                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
987                                 reiserfs_warning(s, "super-6511",
988                                                  "cannot change journaled "
989                                                  "quota options when quota "
990                                                  "turned on.");
991                                 return 0;
992                         }
993                         if (*arg) {     /* Some filename specified? */
994                                 if (REISERFS_SB(s)->s_qf_names[qtype]
995                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
996                                               arg)) {
997                                         reiserfs_warning(s, "super-6512",
998                                                          "%s quota file "
999                                                          "already specified.",
1000                                                          QTYPE2NAME(qtype));
1001                                         return 0;
1002                                 }
1003                                 if (strchr(arg, '/')) {
1004                                         reiserfs_warning(s, "super-6513",
1005                                                          "quotafile must be "
1006                                                          "on filesystem root.");
1007                                         return 0;
1008                                 }
1009                                 qf_names[qtype] =
1010                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1011                                 if (!qf_names[qtype]) {
1012                                         reiserfs_warning(s, "reiserfs-2502",
1013                                                          "not enough memory "
1014                                                          "for storing "
1015                                                          "quotafile name.");
1016                                         return 0;
1017                                 }
1018                                 strcpy(qf_names[qtype], arg);
1019                                 *mount_options |= 1 << REISERFS_QUOTA;
1020                         } else {
1021                                 if (qf_names[qtype] !=
1022                                     REISERFS_SB(s)->s_qf_names[qtype])
1023                                         kfree(qf_names[qtype]);
1024                                 qf_names[qtype] = NULL;
1025                         }
1026                 }
1027                 if (c == 'f') {
1028                         if (!strcmp(arg, "vfsold"))
1029                                 *qfmt = QFMT_VFS_OLD;
1030                         else if (!strcmp(arg, "vfsv0"))
1031                                 *qfmt = QFMT_VFS_V0;
1032                         else {
1033                                 reiserfs_warning(s, "super-6514",
1034                                                  "unknown quota format "
1035                                                  "specified.");
1036                                 return 0;
1037                         }
1038                         if (sb_any_quota_loaded(s) &&
1039                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1040                                 reiserfs_warning(s, "super-6515",
1041                                                  "cannot change journaled "
1042                                                  "quota options when quota "
1043                                                  "turned on.");
1044                                 return 0;
1045                         }
1046                 }
1047 #else
1048                 if (c == 'u' || c == 'g' || c == 'f') {
1049                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1050                                          "quota options not supported.");
1051                         return 0;
1052                 }
1053 #endif
1054         }
1055
1056 #ifdef CONFIG_QUOTA
1057         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1058             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1059                 reiserfs_warning(s, "super-6515",
1060                                  "journaled quota format not specified.");
1061                 return 0;
1062         }
1063         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1064         if (!(*mount_options & (1 << REISERFS_QUOTA))
1065             && sb_any_quota_loaded(s)) {
1066                 reiserfs_warning(s, "super-6516", "quota options must "
1067                                  "be present when quota is turned on.");
1068                 return 0;
1069         }
1070 #endif
1071
1072         return 1;
1073 }
1074
1075 static void switch_data_mode(struct super_block *s, unsigned long mode)
1076 {
1077         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1078                                          (1 << REISERFS_DATA_ORDERED) |
1079                                          (1 << REISERFS_DATA_WRITEBACK));
1080         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1081 }
1082
1083 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1084 {
1085         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1086                 if (!reiserfs_data_log(s)) {
1087                         switch_data_mode(s, REISERFS_DATA_LOG);
1088                         reiserfs_info(s, "switching to journaled data mode\n");
1089                 }
1090         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1091                 if (!reiserfs_data_ordered(s)) {
1092                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1093                         reiserfs_info(s, "switching to ordered data mode\n");
1094                 }
1095         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1096                 if (!reiserfs_data_writeback(s)) {
1097                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1098                         reiserfs_info(s, "switching to writeback data mode\n");
1099                 }
1100         }
1101 }
1102
1103 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1104 {
1105         int flush = (1 << REISERFS_BARRIER_FLUSH);
1106         int none = (1 << REISERFS_BARRIER_NONE);
1107         int all_barrier = flush | none;
1108
1109         if (bits & all_barrier) {
1110                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1111                 if (bits & flush) {
1112                         REISERFS_SB(s)->s_mount_opt |= flush;
1113                         printk("reiserfs: enabling write barrier flush mode\n");
1114                 } else if (bits & none) {
1115                         REISERFS_SB(s)->s_mount_opt |= none;
1116                         printk("reiserfs: write barriers turned off\n");
1117                 }
1118         }
1119 }
1120
1121 static void handle_attrs(struct super_block *s)
1122 {
1123         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1124
1125         if (reiserfs_attrs(s)) {
1126                 if (old_format_only(s)) {
1127                         reiserfs_warning(s, "super-6517", "cannot support "
1128                                          "attributes on 3.5.x disk format");
1129                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1130                         return;
1131                 }
1132                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1133                         reiserfs_warning(s, "super-6518", "cannot support "
1134                                          "attributes until flag is set in "
1135                                          "super-block");
1136                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1137                 }
1138         }
1139 }
1140
1141 #ifdef CONFIG_QUOTA
1142 static void handle_quota_files(struct super_block *s, char **qf_names,
1143                                unsigned int *qfmt)
1144 {
1145         int i;
1146
1147         for (i = 0; i < MAXQUOTAS; i++) {
1148                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1149                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1150                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1151         }
1152         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1153 }
1154 #endif
1155
1156 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1157 {
1158         struct reiserfs_super_block *rs;
1159         struct reiserfs_transaction_handle th;
1160         unsigned long blocks;
1161         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1162         unsigned long safe_mask = 0;
1163         unsigned int commit_max_age = (unsigned int)-1;
1164         struct reiserfs_journal *journal = SB_JOURNAL(s);
1165         char *new_opts = kstrdup(arg, GFP_KERNEL);
1166         int err;
1167         char *qf_names[MAXQUOTAS];
1168         unsigned int qfmt = 0;
1169 #ifdef CONFIG_QUOTA
1170         int i;
1171 #endif
1172
1173         reiserfs_write_lock(s);
1174
1175 #ifdef CONFIG_QUOTA
1176         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1177 #endif
1178
1179         rs = SB_DISK_SUPER_BLOCK(s);
1180
1181         if (!reiserfs_parse_options
1182             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1183             qf_names, &qfmt)) {
1184 #ifdef CONFIG_QUOTA
1185                 for (i = 0; i < MAXQUOTAS; i++)
1186                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1187                                 kfree(qf_names[i]);
1188 #endif
1189                 err = -EINVAL;
1190                 goto out_err;
1191         }
1192 #ifdef CONFIG_QUOTA
1193         handle_quota_files(s, qf_names, &qfmt);
1194 #endif
1195
1196         handle_attrs(s);
1197
1198         /* Add options that are safe here */
1199         safe_mask |= 1 << REISERFS_SMALLTAIL;
1200         safe_mask |= 1 << REISERFS_LARGETAIL;
1201         safe_mask |= 1 << REISERFS_NO_BORDER;
1202         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1203         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1204         safe_mask |= 1 << REISERFS_TEST4;
1205         safe_mask |= 1 << REISERFS_ATTRS;
1206         safe_mask |= 1 << REISERFS_XATTRS_USER;
1207         safe_mask |= 1 << REISERFS_POSIXACL;
1208         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1209         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1210         safe_mask |= 1 << REISERFS_ERROR_RO;
1211         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1212         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1213         safe_mask |= 1 << REISERFS_QUOTA;
1214
1215         /* Update the bitmask, taking care to keep
1216          * the bits we're not allowed to change here */
1217         REISERFS_SB(s)->s_mount_opt =
1218             (REISERFS_SB(s)->
1219              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1220
1221         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1222                 journal->j_max_commit_age = commit_max_age;
1223                 journal->j_max_trans_age = commit_max_age;
1224         } else if (commit_max_age == 0) {
1225                 /* 0 means restore defaults. */
1226                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1227                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1228         }
1229
1230         if (blocks) {
1231                 err = reiserfs_resize(s, blocks);
1232                 if (err != 0)
1233                         goto out_err;
1234         }
1235
1236         if (*mount_flags & MS_RDONLY) {
1237                 reiserfs_xattr_init(s, *mount_flags);
1238                 /* remount read-only */
1239                 if (s->s_flags & MS_RDONLY)
1240                         /* it is read-only already */
1241                         goto out_ok;
1242                 /* try to remount file system with read-only permissions */
1243                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1244                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1245                         goto out_ok;
1246                 }
1247
1248                 err = journal_begin(&th, s, 10);
1249                 if (err)
1250                         goto out_err;
1251
1252                 /* Mounting a rw partition read-only. */
1253                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1254                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1255                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1256         } else {
1257                 /* remount read-write */
1258                 if (!(s->s_flags & MS_RDONLY)) {
1259                         reiserfs_xattr_init(s, *mount_flags);
1260                         goto out_ok;    /* We are read-write already */
1261                 }
1262
1263                 if (reiserfs_is_journal_aborted(journal)) {
1264                         err = journal->j_errno;
1265                         goto out_err;
1266                 }
1267
1268                 handle_data_mode(s, mount_options);
1269                 handle_barrier_mode(s, mount_options);
1270                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1271                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1272                 err = journal_begin(&th, s, 10);
1273                 if (err)
1274                         goto out_err;
1275
1276                 /* Mount a partition which is read-only, read-write */
1277                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1278                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1279                 s->s_flags &= ~MS_RDONLY;
1280                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1281                 if (!old_format_only(s))
1282                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1283                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1284                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1285                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1286         }
1287         /* this will force a full flush of all journal lists */
1288         SB_JOURNAL(s)->j_must_wait = 1;
1289         err = journal_end(&th, s, 10);
1290         if (err)
1291                 goto out_err;
1292         s->s_dirt = 0;
1293
1294         if (!(*mount_flags & MS_RDONLY)) {
1295                 finish_unfinished(s);
1296                 reiserfs_xattr_init(s, *mount_flags);
1297         }
1298
1299 out_ok:
1300         replace_mount_options(s, new_opts);
1301         reiserfs_write_unlock(s);
1302         return 0;
1303
1304 out_err:
1305         kfree(new_opts);
1306         reiserfs_write_unlock(s);
1307         return err;
1308 }
1309
1310 static int read_super_block(struct super_block *s, int offset)
1311 {
1312         struct buffer_head *bh;
1313         struct reiserfs_super_block *rs;
1314         int fs_blocksize;
1315
1316         bh = sb_bread(s, offset / s->s_blocksize);
1317         if (!bh) {
1318                 reiserfs_warning(s, "sh-2006",
1319                                  "bread failed (dev %s, block %lu, size %lu)",
1320                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1321                                  s->s_blocksize);
1322                 return 1;
1323         }
1324
1325         rs = (struct reiserfs_super_block *)bh->b_data;
1326         if (!is_any_reiserfs_magic_string(rs)) {
1327                 brelse(bh);
1328                 return 1;
1329         }
1330         //
1331         // ok, reiserfs signature (old or new) found in at the given offset
1332         //
1333         fs_blocksize = sb_blocksize(rs);
1334         brelse(bh);
1335         sb_set_blocksize(s, fs_blocksize);
1336
1337         bh = sb_bread(s, offset / s->s_blocksize);
1338         if (!bh) {
1339                 reiserfs_warning(s, "sh-2007",
1340                                  "bread failed (dev %s, block %lu, size %lu)",
1341                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1342                                  s->s_blocksize);
1343                 return 1;
1344         }
1345
1346         rs = (struct reiserfs_super_block *)bh->b_data;
1347         if (sb_blocksize(rs) != s->s_blocksize) {
1348                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1349                                  "filesystem on (dev %s, block %Lu, size %lu)",
1350                                  reiserfs_bdevname(s),
1351                                  (unsigned long long)bh->b_blocknr,
1352                                  s->s_blocksize);
1353                 brelse(bh);
1354                 return 1;
1355         }
1356
1357         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1358                 brelse(bh);
1359                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1360                                  "--rebuild-tree run detected. Please run\n"
1361                                  "reiserfsck --rebuild-tree and wait for a "
1362                                  "completion. If that fails\n"
1363                                  "get newer reiserfsprogs package");
1364                 return 1;
1365         }
1366
1367         SB_BUFFER_WITH_SB(s) = bh;
1368         SB_DISK_SUPER_BLOCK(s) = rs;
1369
1370         if (is_reiserfs_jr(rs)) {
1371                 /* magic is of non-standard journal filesystem, look at s_version to
1372                    find which format is in use */
1373                 if (sb_version(rs) == REISERFS_VERSION_2)
1374                         reiserfs_info(s, "found reiserfs format \"3.6\""
1375                                       " with non-standard journal\n");
1376                 else if (sb_version(rs) == REISERFS_VERSION_1)
1377                         reiserfs_info(s, "found reiserfs format \"3.5\""
1378                                       " with non-standard journal\n");
1379                 else {
1380                         reiserfs_warning(s, "sh-2012", "found unknown "
1381                                          "format \"%u\" of reiserfs with "
1382                                          "non-standard magic", sb_version(rs));
1383                         return 1;
1384                 }
1385         } else
1386                 /* s_version of standard format may contain incorrect information,
1387                    so we just look at the magic string */
1388                 reiserfs_info(s,
1389                               "found reiserfs format \"%s\" with standard journal\n",
1390                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1391
1392         s->s_op = &reiserfs_sops;
1393         s->s_export_op = &reiserfs_export_ops;
1394 #ifdef CONFIG_QUOTA
1395         s->s_qcop = &reiserfs_qctl_operations;
1396         s->dq_op = &reiserfs_quota_operations;
1397 #endif
1398
1399         /* new format is limited by the 32 bit wide i_blocks field, want to
1400          ** be one full block below that.
1401          */
1402         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1403         return 0;
1404 }
1405
1406 /* after journal replay, reread all bitmap and super blocks */
1407 static int reread_meta_blocks(struct super_block *s)
1408 {
1409         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1410         reiserfs_write_unlock(s);
1411         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1412         reiserfs_write_lock(s);
1413         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1414                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1415                 return 1;
1416         }
1417
1418         return 0;
1419 }
1420
1421 /////////////////////////////////////////////////////
1422 // hash detection stuff
1423
1424 // if root directory is empty - we set default - Yura's - hash and
1425 // warn about it
1426 // FIXME: we look for only one name in a directory. If tea and yura
1427 // bith have the same value - we ask user to send report to the
1428 // mailing list
1429 static __u32 find_hash_out(struct super_block *s)
1430 {
1431         int retval;
1432         struct inode *inode;
1433         struct cpu_key key;
1434         INITIALIZE_PATH(path);
1435         struct reiserfs_dir_entry de;
1436         __u32 hash = DEFAULT_HASH;
1437
1438         inode = s->s_root->d_inode;
1439
1440         do {                    // Some serious "goto"-hater was there ;)
1441                 u32 teahash, r5hash, yurahash;
1442
1443                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1444                 retval = search_by_entry_key(s, &key, &path, &de);
1445                 if (retval == IO_ERROR) {
1446                         pathrelse(&path);
1447                         return UNSET_HASH;
1448                 }
1449                 if (retval == NAME_NOT_FOUND)
1450                         de.de_entry_num--;
1451                 set_de_name_and_namelen(&de);
1452                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1453                         /* allow override in this case */
1454                         if (reiserfs_rupasov_hash(s)) {
1455                                 hash = YURA_HASH;
1456                         }
1457                         reiserfs_info(s, "FS seems to be empty, autodetect "
1458                                          "is using the default hash\n");
1459                         break;
1460                 }
1461                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1462                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1463                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1464                 if (((teahash == r5hash)
1465                      &&
1466                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1467                       == r5hash)) || ((teahash == yurahash)
1468                                       && (yurahash ==
1469                                           GET_HASH_VALUE(deh_offset
1470                                                          (&
1471                                                           (de.
1472                                                            de_deh[de.
1473                                                                   de_entry_num])))))
1474                     || ((r5hash == yurahash)
1475                         && (yurahash ==
1476                             GET_HASH_VALUE(deh_offset
1477                                            (&(de.de_deh[de.de_entry_num])))))) {
1478                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1479                                          "automatically detect hash function. "
1480                                          "Please mount with -o "
1481                                          "hash={tea,rupasov,r5}");
1482                         hash = UNSET_HASH;
1483                         break;
1484                 }
1485                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1486                     yurahash)
1487                         hash = YURA_HASH;
1488                 else if (GET_HASH_VALUE
1489                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1490                         hash = TEA_HASH;
1491                 else if (GET_HASH_VALUE
1492                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1493                         hash = R5_HASH;
1494                 else {
1495                         reiserfs_warning(s, "reiserfs-2506",
1496                                          "Unrecognised hash function");
1497                         hash = UNSET_HASH;
1498                 }
1499         } while (0);
1500
1501         pathrelse(&path);
1502         return hash;
1503 }
1504
1505 // finds out which hash names are sorted with
1506 static int what_hash(struct super_block *s)
1507 {
1508         __u32 code;
1509
1510         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1511
1512         /* reiserfs_hash_detect() == true if any of the hash mount options
1513          ** were used.  We must check them to make sure the user isn't
1514          ** using a bad hash value
1515          */
1516         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1517                 code = find_hash_out(s);
1518
1519         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1520                 /* detection has found the hash, and we must check against the
1521                  ** mount options
1522                  */
1523                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1524                         reiserfs_warning(s, "reiserfs-2507",
1525                                          "Error, %s hash detected, "
1526                                          "unable to force rupasov hash",
1527                                          reiserfs_hashname(code));
1528                         code = UNSET_HASH;
1529                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1530                         reiserfs_warning(s, "reiserfs-2508",
1531                                          "Error, %s hash detected, "
1532                                          "unable to force tea hash",
1533                                          reiserfs_hashname(code));
1534                         code = UNSET_HASH;
1535                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1536                         reiserfs_warning(s, "reiserfs-2509",
1537                                          "Error, %s hash detected, "
1538                                          "unable to force r5 hash",
1539                                          reiserfs_hashname(code));
1540                         code = UNSET_HASH;
1541                 }
1542         } else {
1543                 /* find_hash_out was not called or could not determine the hash */
1544                 if (reiserfs_rupasov_hash(s)) {
1545                         code = YURA_HASH;
1546                 } else if (reiserfs_tea_hash(s)) {
1547                         code = TEA_HASH;
1548                 } else if (reiserfs_r5_hash(s)) {
1549                         code = R5_HASH;
1550                 }
1551         }
1552
1553         /* if we are mounted RW, and we have a new valid hash code, update
1554          ** the super
1555          */
1556         if (code != UNSET_HASH &&
1557             !(s->s_flags & MS_RDONLY) &&
1558             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1559                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1560         }
1561         return code;
1562 }
1563
1564 // return pointer to appropriate function
1565 static hashf_t hash_function(struct super_block *s)
1566 {
1567         switch (what_hash(s)) {
1568         case TEA_HASH:
1569                 reiserfs_info(s, "Using tea hash to sort names\n");
1570                 return keyed_hash;
1571         case YURA_HASH:
1572                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1573                 return yura_hash;
1574         case R5_HASH:
1575                 reiserfs_info(s, "Using r5 hash to sort names\n");
1576                 return r5_hash;
1577         }
1578         return NULL;
1579 }
1580
1581 // this is used to set up correct value for old partitions
1582 static int function2code(hashf_t func)
1583 {
1584         if (func == keyed_hash)
1585                 return TEA_HASH;
1586         if (func == yura_hash)
1587                 return YURA_HASH;
1588         if (func == r5_hash)
1589                 return R5_HASH;
1590
1591         BUG();                  // should never happen
1592
1593         return 0;
1594 }
1595
1596 #define SWARN(silent, s, id, ...)                       \
1597         if (!(silent))                          \
1598                 reiserfs_warning(s, id, __VA_ARGS__)
1599
1600 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1601 {
1602         struct inode *root_inode;
1603         struct reiserfs_transaction_handle th;
1604         int old_format = 0;
1605         unsigned long blocks;
1606         unsigned int commit_max_age = 0;
1607         int jinit_done = 0;
1608         struct reiserfs_iget_args args;
1609         struct reiserfs_super_block *rs;
1610         char *jdev_name;
1611         struct reiserfs_sb_info *sbi;
1612         int errval = -EINVAL;
1613         char *qf_names[MAXQUOTAS] = {};
1614         unsigned int qfmt = 0;
1615
1616         save_mount_options(s, data);
1617
1618         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1619         if (!sbi) {
1620                 errval = -ENOMEM;
1621                 goto error_alloc;
1622         }
1623         s->s_fs_info = sbi;
1624         /* Set default values for options: non-aggressive tails, RO on errors */
1625         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1626         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1627         /* no preallocation minimum, be smart in
1628            reiserfs_file_write instead */
1629         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1630         /* Preallocate by 16 blocks (17-1) at once */
1631         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1632         /* setup default block allocator options */
1633         reiserfs_init_alloc_options(s);
1634
1635         mutex_init(&REISERFS_SB(s)->lock);
1636         REISERFS_SB(s)->lock_depth = -1;
1637
1638         /*
1639          * This function is called with the bkl, which also was the old
1640          * locking used here.
1641          * do_journal_begin() will soon check if we hold the lock (ie: was the
1642          * bkl). This is likely because do_journal_begin() has several another
1643          * callers because at this time, it doesn't seem to be necessary to
1644          * protect against anything.
1645          * Anyway, let's be conservative and lock for now.
1646          */
1647         reiserfs_write_lock(s);
1648
1649         jdev_name = NULL;
1650         if (reiserfs_parse_options
1651             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1652              &commit_max_age, qf_names, &qfmt) == 0) {
1653                 goto error;
1654         }
1655 #ifdef CONFIG_QUOTA
1656         handle_quota_files(s, qf_names, &qfmt);
1657 #endif
1658
1659         if (blocks) {
1660                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1661                 goto error;
1662         }
1663
1664         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1665         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1666                 old_format = 1;
1667         /* try new format (64-th 1k block), which can contain reiserfs super block */
1668         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1669                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1670                       reiserfs_bdevname(s));
1671                 goto error;
1672         }
1673
1674         rs = SB_DISK_SUPER_BLOCK(s);
1675         /* Let's do basic sanity check to verify that underlying device is not
1676            smaller than the filesystem. If the check fails then abort and scream,
1677            because bad stuff will happen otherwise. */
1678         if (s->s_bdev && s->s_bdev->bd_inode
1679             && i_size_read(s->s_bdev->bd_inode) <
1680             sb_block_count(rs) * sb_blocksize(rs)) {
1681                 SWARN(silent, s, "", "Filesystem cannot be "
1682                       "mounted because it is bigger than the device");
1683                 SWARN(silent, s, "", "You may need to run fsck "
1684                       "or increase size of your LVM partition");
1685                 SWARN(silent, s, "", "Or may be you forgot to "
1686                       "reboot after fdisk when it told you to");
1687                 goto error;
1688         }
1689
1690         sbi->s_mount_state = SB_REISERFS_STATE(s);
1691         sbi->s_mount_state = REISERFS_VALID_FS;
1692
1693         if ((errval = reiserfs_init_bitmap_cache(s))) {
1694                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1695                 goto error;
1696         }
1697         errval = -EINVAL;
1698 #ifdef CONFIG_REISERFS_CHECK
1699         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1700         SWARN(silent, s, "", "- it is slow mode for debugging.");
1701 #endif
1702
1703         /* make data=ordered the default */
1704         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1705             !reiserfs_data_writeback(s)) {
1706                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1707         }
1708
1709         if (reiserfs_data_log(s)) {
1710                 reiserfs_info(s, "using journaled data mode\n");
1711         } else if (reiserfs_data_ordered(s)) {
1712                 reiserfs_info(s, "using ordered data mode\n");
1713         } else {
1714                 reiserfs_info(s, "using writeback data mode\n");
1715         }
1716         if (reiserfs_barrier_flush(s)) {
1717                 printk("reiserfs: using flush barriers\n");
1718         }
1719         // set_device_ro(s->s_dev, 1) ;
1720         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1721                 SWARN(silent, s, "sh-2022",
1722                       "unable to initialize journal space");
1723                 goto error;
1724         } else {
1725                 jinit_done = 1; /* once this is set, journal_release must be called
1726                                  ** if we error out of the mount
1727                                  */
1728         }
1729         if (reread_meta_blocks(s)) {
1730                 SWARN(silent, s, "jmacd-9",
1731                       "unable to reread meta blocks after journal init");
1732                 goto error;
1733         }
1734
1735         if (replay_only(s))
1736                 goto error;
1737
1738         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1739                 SWARN(silent, s, "clm-7000",
1740                       "Detected readonly device, marking FS readonly");
1741                 s->s_flags |= MS_RDONLY;
1742         }
1743         args.objectid = REISERFS_ROOT_OBJECTID;
1744         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1745         root_inode =
1746             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1747                          reiserfs_init_locked_inode, (void *)(&args));
1748         if (!root_inode) {
1749                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1750                 goto error;
1751         }
1752
1753         if (root_inode->i_state & I_NEW) {
1754                 reiserfs_read_locked_inode(root_inode, &args);
1755                 unlock_new_inode(root_inode);
1756         }
1757
1758         s->s_root = d_alloc_root(root_inode);
1759         if (!s->s_root) {
1760                 iput(root_inode);
1761                 goto error;
1762         }
1763         // define and initialize hash function
1764         sbi->s_hash_function = hash_function(s);
1765         if (sbi->s_hash_function == NULL) {
1766                 dput(s->s_root);
1767                 s->s_root = NULL;
1768                 goto error;
1769         }
1770
1771         if (is_reiserfs_3_5(rs)
1772             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1773                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1774         else if (old_format)
1775                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1776         else
1777                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1778
1779         if (!(s->s_flags & MS_RDONLY)) {
1780
1781                 errval = journal_begin(&th, s, 1);
1782                 if (errval) {
1783                         dput(s->s_root);
1784                         s->s_root = NULL;
1785                         goto error;
1786                 }
1787                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1788
1789                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1790                 set_sb_fs_state(rs, 0);
1791
1792                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1793                  * case, but older revisions can't. This will cause the
1794                  * file system to fail mount on those older implementations,
1795                  * avoiding corruption. -jeffm */
1796                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1797                     sb_bmap_nr(rs) != 0) {
1798                         reiserfs_warning(s, "super-2030", "This file system "
1799                                         "claims to use %u bitmap blocks in "
1800                                         "its super block, but requires %u. "
1801                                         "Clearing to zero.", sb_bmap_nr(rs),
1802                                         reiserfs_bmap_count(s));
1803
1804                         set_sb_bmap_nr(rs, 0);
1805                 }
1806
1807                 if (old_format_only(s)) {
1808                         /* filesystem of format 3.5 either with standard or non-standard
1809                            journal */
1810                         if (convert_reiserfs(s)) {
1811                                 /* and -o conv is given */
1812                                 if (!silent)
1813                                         reiserfs_info(s,
1814                                                       "converting 3.5 filesystem to the 3.6 format");
1815
1816                                 if (is_reiserfs_3_5(rs))
1817                                         /* put magic string of 3.6 format. 2.2 will not be able to
1818                                            mount this filesystem anymore */
1819                                         memcpy(rs->s_v1.s_magic,
1820                                                reiserfs_3_6_magic_string,
1821                                                sizeof
1822                                                (reiserfs_3_6_magic_string));
1823
1824                                 set_sb_version(rs, REISERFS_VERSION_2);
1825                                 reiserfs_convert_objectid_map_v1(s);
1826                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1827                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1828                         } else if (!silent) {
1829                                 reiserfs_info(s, "using 3.5.x disk format\n");
1830                         }
1831                 } else
1832                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1833
1834
1835                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1836                 errval = journal_end(&th, s, 1);
1837                 if (errval) {
1838                         dput(s->s_root);
1839                         s->s_root = NULL;
1840                         goto error;
1841                 }
1842
1843                 if ((errval = reiserfs_lookup_privroot(s)) ||
1844                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1845                         dput(s->s_root);
1846                         s->s_root = NULL;
1847                         goto error;
1848                 }
1849
1850                 /* look for files which were to be removed in previous session */
1851                 finish_unfinished(s);
1852         } else {
1853                 if (old_format_only(s) && !silent) {
1854                         reiserfs_info(s, "using 3.5.x disk format\n");
1855                 }
1856
1857                 if ((errval = reiserfs_lookup_privroot(s)) ||
1858                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1859                         dput(s->s_root);
1860                         s->s_root = NULL;
1861                         goto error;
1862                 }
1863         }
1864         // mark hash in super block: it could be unset. overwrite should be ok
1865         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1866
1867         handle_attrs(s);
1868
1869         reiserfs_proc_info_init(s);
1870
1871         init_waitqueue_head(&(sbi->s_wait));
1872         spin_lock_init(&sbi->bitmap_lock);
1873
1874         reiserfs_write_unlock(s);
1875
1876         return (0);
1877
1878 error:
1879         reiserfs_write_unlock(s);
1880 error_alloc:
1881         if (jinit_done) {       /* kill the commit thread, free journal ram */
1882                 journal_release_error(NULL, s);
1883         }
1884
1885         reiserfs_free_bitmap_cache(s);
1886         if (SB_BUFFER_WITH_SB(s))
1887                 brelse(SB_BUFFER_WITH_SB(s));
1888 #ifdef CONFIG_QUOTA
1889         {
1890                 int j;
1891                 for (j = 0; j < MAXQUOTAS; j++)
1892                         kfree(qf_names[j]);
1893         }
1894 #endif
1895         kfree(sbi);
1896
1897         s->s_fs_info = NULL;
1898         return errval;
1899 }
1900
1901 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1902 {
1903         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1904
1905         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1906         buf->f_bfree = sb_free_blocks(rs);
1907         buf->f_bavail = buf->f_bfree;
1908         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1909         buf->f_bsize = dentry->d_sb->s_blocksize;
1910         /* changed to accommodate gcc folks. */
1911         buf->f_type = REISERFS_SUPER_MAGIC;
1912         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1913         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1914                                 sizeof(rs->s_uuid)/2);
1915
1916         return 0;
1917 }
1918
1919 #ifdef CONFIG_QUOTA
1920 static int reiserfs_write_dquot(struct dquot *dquot)
1921 {
1922         struct reiserfs_transaction_handle th;
1923         int ret, err;
1924
1925         reiserfs_write_lock(dquot->dq_sb);
1926         ret =
1927             journal_begin(&th, dquot->dq_sb,
1928                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1929         if (ret)
1930                 goto out;
1931         ret = dquot_commit(dquot);
1932         err =
1933             journal_end(&th, dquot->dq_sb,
1934                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1935         if (!ret && err)
1936                 ret = err;
1937       out:
1938         reiserfs_write_unlock(dquot->dq_sb);
1939         return ret;
1940 }
1941
1942 static int reiserfs_acquire_dquot(struct dquot *dquot)
1943 {
1944         struct reiserfs_transaction_handle th;
1945         int ret, err;
1946
1947         reiserfs_write_lock(dquot->dq_sb);
1948         ret =
1949             journal_begin(&th, dquot->dq_sb,
1950                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1951         if (ret)
1952                 goto out;
1953         ret = dquot_acquire(dquot);
1954         err =
1955             journal_end(&th, dquot->dq_sb,
1956                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1957         if (!ret && err)
1958                 ret = err;
1959       out:
1960         reiserfs_write_unlock(dquot->dq_sb);
1961         return ret;
1962 }
1963
1964 static int reiserfs_release_dquot(struct dquot *dquot)
1965 {
1966         struct reiserfs_transaction_handle th;
1967         int ret, err;
1968
1969         reiserfs_write_lock(dquot->dq_sb);
1970         ret =
1971             journal_begin(&th, dquot->dq_sb,
1972                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1973         if (ret) {
1974                 /* Release dquot anyway to avoid endless cycle in dqput() */
1975                 dquot_release(dquot);
1976                 goto out;
1977         }
1978         ret = dquot_release(dquot);
1979         err =
1980             journal_end(&th, dquot->dq_sb,
1981                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1982         if (!ret && err)
1983                 ret = err;
1984       out:
1985         reiserfs_write_unlock(dquot->dq_sb);
1986         return ret;
1987 }
1988
1989 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1990 {
1991         /* Are we journaling quotas? */
1992         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1993             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1994                 dquot_mark_dquot_dirty(dquot);
1995                 return reiserfs_write_dquot(dquot);
1996         } else
1997                 return dquot_mark_dquot_dirty(dquot);
1998 }
1999
2000 static int reiserfs_write_info(struct super_block *sb, int type)
2001 {
2002         struct reiserfs_transaction_handle th;
2003         int ret, err;
2004
2005         /* Data block + inode block */
2006         reiserfs_write_lock(sb);
2007         ret = journal_begin(&th, sb, 2);
2008         if (ret)
2009                 goto out;
2010         ret = dquot_commit_info(sb, type);
2011         err = journal_end(&th, sb, 2);
2012         if (!ret && err)
2013                 ret = err;
2014       out:
2015         reiserfs_write_unlock(sb);
2016         return ret;
2017 }
2018
2019 /*
2020  * Turn on quotas during mount time - we need to find the quota file and such...
2021  */
2022 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2023 {
2024         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2025                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2026 }
2027
2028 /*
2029  * Standard function to be called on quota_on
2030  */
2031 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2032                              char *name, int remount)
2033 {
2034         int err;
2035         struct path path;
2036         struct inode *inode;
2037         struct reiserfs_transaction_handle th;
2038
2039         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2040                 return -EINVAL;
2041         /* No more checks needed? Path and format_id are bogus anyway... */
2042         if (remount)
2043                 return vfs_quota_on(sb, type, format_id, name, 1);
2044         err = kern_path(name, LOOKUP_FOLLOW, &path);
2045         if (err)
2046                 return err;
2047         /* Quotafile not on the same filesystem? */
2048         if (path.mnt->mnt_sb != sb) {
2049                 err = -EXDEV;
2050                 goto out;
2051         }
2052         inode = path.dentry->d_inode;
2053         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2054         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2055                 err = reiserfs_unpack(inode, NULL);
2056                 if (err) {
2057                         reiserfs_warning(sb, "super-6520",
2058                                 "Unpacking tail of quota file failed"
2059                                 " (%d). Cannot turn on quotas.", err);
2060                         err = -EINVAL;
2061                         goto out;
2062                 }
2063                 mark_inode_dirty(inode);
2064         }
2065         /* Journaling quota? */
2066         if (REISERFS_SB(sb)->s_qf_names[type]) {
2067                 /* Quotafile not of fs root? */
2068                 if (path.dentry->d_parent != sb->s_root)
2069                         reiserfs_warning(sb, "super-6521",
2070                                  "Quota file not on filesystem root. "
2071                                  "Journalled quota will not work.");
2072         }
2073
2074         /*
2075          * When we journal data on quota file, we have to flush journal to see
2076          * all updates to the file when we bypass pagecache...
2077          */
2078         if (reiserfs_file_data_log(inode)) {
2079                 /* Just start temporary transaction and finish it */
2080                 err = journal_begin(&th, sb, 1);
2081                 if (err)
2082                         goto out;
2083                 err = journal_end_sync(&th, sb, 1);
2084                 if (err)
2085                         goto out;
2086         }
2087         err = vfs_quota_on_path(sb, type, format_id, &path);
2088 out:
2089         path_put(&path);
2090         return err;
2091 }
2092
2093 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2094  * acquiring the locks... As quota files are never truncated and quota code
2095  * itself serializes the operations (and noone else should touch the files)
2096  * we don't have to be afraid of races */
2097 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2098                                    size_t len, loff_t off)
2099 {
2100         struct inode *inode = sb_dqopt(sb)->files[type];
2101         unsigned long blk = off >> sb->s_blocksize_bits;
2102         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2103         size_t toread;
2104         struct buffer_head tmp_bh, *bh;
2105         loff_t i_size = i_size_read(inode);
2106
2107         if (off > i_size)
2108                 return 0;
2109         if (off + len > i_size)
2110                 len = i_size - off;
2111         toread = len;
2112         while (toread > 0) {
2113                 tocopy =
2114                     sb->s_blocksize - offset <
2115                     toread ? sb->s_blocksize - offset : toread;
2116                 tmp_bh.b_state = 0;
2117                 /* Quota files are without tails so we can safely use this function */
2118                 reiserfs_write_lock(sb);
2119                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2120                 reiserfs_write_unlock(sb);
2121                 if (err)
2122                         return err;
2123                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2124                         memset(data, 0, tocopy);
2125                 else {
2126                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2127                         if (!bh)
2128                                 return -EIO;
2129                         memcpy(data, bh->b_data + offset, tocopy);
2130                         brelse(bh);
2131                 }
2132                 offset = 0;
2133                 toread -= tocopy;
2134                 data += tocopy;
2135                 blk++;
2136         }
2137         return len;
2138 }
2139
2140 /* Write to quotafile (we know the transaction is already started and has
2141  * enough credits) */
2142 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2143                                     const char *data, size_t len, loff_t off)
2144 {
2145         struct inode *inode = sb_dqopt(sb)->files[type];
2146         unsigned long blk = off >> sb->s_blocksize_bits;
2147         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2148         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2149         size_t towrite = len;
2150         struct buffer_head tmp_bh, *bh;
2151
2152         if (!current->journal_info) {
2153                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2154                         " cancelled because transaction is not started.\n",
2155                         (unsigned long long)off, (unsigned long long)len);
2156                 return -EIO;
2157         }
2158         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2159         while (towrite > 0) {
2160                 tocopy = sb->s_blocksize - offset < towrite ?
2161                     sb->s_blocksize - offset : towrite;
2162                 tmp_bh.b_state = 0;
2163                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2164                 if (err)
2165                         goto out;
2166                 if (offset || tocopy != sb->s_blocksize)
2167                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2168                 else
2169                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2170                 if (!bh) {
2171                         err = -EIO;
2172                         goto out;
2173                 }
2174                 lock_buffer(bh);
2175                 memcpy(bh->b_data + offset, data, tocopy);
2176                 flush_dcache_page(bh->b_page);
2177                 set_buffer_uptodate(bh);
2178                 unlock_buffer(bh);
2179                 reiserfs_prepare_for_journal(sb, bh, 1);
2180                 journal_mark_dirty(current->journal_info, sb, bh);
2181                 if (!journal_quota)
2182                         reiserfs_add_ordered_list(inode, bh);
2183                 brelse(bh);
2184                 offset = 0;
2185                 towrite -= tocopy;
2186                 data += tocopy;
2187                 blk++;
2188         }
2189 out:
2190         if (len == towrite) {
2191                 mutex_unlock(&inode->i_mutex);
2192                 return err;
2193         }
2194         if (inode->i_size < off + len - towrite)
2195                 i_size_write(inode, off + len - towrite);
2196         inode->i_version++;
2197         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2198         mark_inode_dirty(inode);
2199         mutex_unlock(&inode->i_mutex);
2200         return len - towrite;
2201 }
2202
2203 #endif
2204
2205 static int get_super_block(struct file_system_type *fs_type,
2206                            int flags, const char *dev_name,
2207                            void *data, struct vfsmount *mnt)
2208 {
2209         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2210                            mnt);
2211 }
2212
2213 static int __init init_reiserfs_fs(void)
2214 {
2215         int ret;
2216
2217         if ((ret = init_inodecache())) {
2218                 return ret;
2219         }
2220
2221         reiserfs_proc_info_global_init();
2222         reiserfs_proc_register_global("version",
2223                                       reiserfs_global_version_in_proc);
2224
2225         ret = register_filesystem(&reiserfs_fs_type);
2226
2227         if (ret == 0) {
2228                 return 0;
2229         }
2230
2231         reiserfs_proc_unregister_global("version");
2232         reiserfs_proc_info_global_done();
2233         destroy_inodecache();
2234
2235         return ret;
2236 }
2237
2238 static void __exit exit_reiserfs_fs(void)
2239 {
2240         reiserfs_proc_unregister_global("version");
2241         reiserfs_proc_info_global_done();
2242         unregister_filesystem(&reiserfs_fs_type);
2243         destroy_inodecache();
2244 }
2245
2246 struct file_system_type reiserfs_fs_type = {
2247         .owner = THIS_MODULE,
2248         .name = "reiserfs",
2249         .get_sb = get_super_block,
2250         .kill_sb = reiserfs_kill_sb,
2251         .fs_flags = FS_REQUIRES_DEV,
2252 };
2253
2254 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2255 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2256 MODULE_LICENSE("GPL");
2257
2258 module_init(init_reiserfs_fs);
2259 module_exit(exit_reiserfs_fs);