97c3e8ed7db692476bb4081ca69a197ddc6cc829
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mount.h>
28 #include <linux/namei.h>
29 #include <linux/crc32.h>
30 #include <linux/smp_lock.h>
31
32 struct file_system_type reiserfs_fs_type;
33
34 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
35 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
36 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
37
38 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
39 {
40         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
41                         strlen(reiserfs_3_5_magic_string));
42 }
43
44 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
45 {
46         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
47                         strlen(reiserfs_3_6_magic_string));
48 }
49
50 int is_reiserfs_jr(struct reiserfs_super_block *rs)
51 {
52         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
53                         strlen(reiserfs_jr_magic_string));
54 }
55
56 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
57 {
58         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
59                 is_reiserfs_jr(rs));
60 }
61
62 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
63 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
64
65 static int reiserfs_sync_fs(struct super_block *s, int wait)
66 {
67         struct reiserfs_transaction_handle th;
68
69         reiserfs_write_lock(s);
70         if (!journal_begin(&th, s, 1))
71                 if (!journal_end_sync(&th, s, 1))
72                         reiserfs_flush_old_commits(s);
73         s->s_dirt = 0;  /* Even if it's not true.
74                          * We'll loop forever in sync_supers otherwise */
75         reiserfs_write_unlock(s);
76         return 0;
77 }
78
79 static void reiserfs_write_super(struct super_block *s)
80 {
81         reiserfs_sync_fs(s, 1);
82 }
83
84 static int reiserfs_freeze(struct super_block *s)
85 {
86         struct reiserfs_transaction_handle th;
87         reiserfs_write_lock(s);
88         if (!(s->s_flags & MS_RDONLY)) {
89                 int err = journal_begin(&th, s, 1);
90                 if (err) {
91                         reiserfs_block_writes(&th);
92                 } else {
93                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
94                                                      1);
95                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
96                         reiserfs_block_writes(&th);
97                         journal_end_sync(&th, s, 1);
98                 }
99         }
100         s->s_dirt = 0;
101         reiserfs_write_unlock(s);
102         return 0;
103 }
104
105 static int reiserfs_unfreeze(struct super_block *s)
106 {
107         reiserfs_allow_writes(s);
108         return 0;
109 }
110
111 extern const struct in_core_key MAX_IN_CORE_KEY;
112
113 /* this is used to delete "save link" when there are no items of a
114    file it points to. It can either happen if unlink is completed but
115    "save unlink" removal, or if file has both unlink and truncate
116    pending and as unlink completes first (because key of "save link"
117    protecting unlink is bigger that a key lf "save link" which
118    protects truncate), so there left no items to make truncate
119    completion on */
120 static int remove_save_link_only(struct super_block *s,
121                                  struct reiserfs_key *key, int oid_free)
122 {
123         struct reiserfs_transaction_handle th;
124         int err;
125
126         /* we are going to do one balancing */
127         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
128         if (err)
129                 return err;
130
131         reiserfs_delete_solid_item(&th, NULL, key);
132         if (oid_free)
133                 /* removals are protected by direct items */
134                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
135
136         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
137 }
138
139 #ifdef CONFIG_QUOTA
140 static int reiserfs_quota_on_mount(struct super_block *, int);
141 #endif
142
143 /* look for uncompleted unlinks and truncates and complete them */
144 static int finish_unfinished(struct super_block *s)
145 {
146         INITIALIZE_PATH(path);
147         struct cpu_key max_cpu_key, obj_key;
148         struct reiserfs_key save_link_key, last_inode_key;
149         int retval = 0;
150         struct item_head *ih;
151         struct buffer_head *bh;
152         int item_pos;
153         char *item;
154         int done;
155         struct inode *inode;
156         int truncate;
157 #ifdef CONFIG_QUOTA
158         int i;
159         int ms_active_set;
160 #endif
161
162         /* compose key to look for "save" links */
163         max_cpu_key.version = KEY_FORMAT_3_5;
164         max_cpu_key.on_disk_key.k_dir_id = ~0U;
165         max_cpu_key.on_disk_key.k_objectid = ~0U;
166         set_cpu_key_k_offset(&max_cpu_key, ~0U);
167         max_cpu_key.key_length = 3;
168
169         memset(&last_inode_key, 0, sizeof(last_inode_key));
170
171 #ifdef CONFIG_QUOTA
172         /* Needed for iput() to work correctly and not trash data */
173         if (s->s_flags & MS_ACTIVE) {
174                 ms_active_set = 0;
175         } else {
176                 ms_active_set = 1;
177                 s->s_flags |= MS_ACTIVE;
178         }
179         /* Turn on quotas so that they are updated correctly */
180         for (i = 0; i < MAXQUOTAS; i++) {
181                 if (REISERFS_SB(s)->s_qf_names[i]) {
182                         int ret = reiserfs_quota_on_mount(s, i);
183                         if (ret < 0)
184                                 reiserfs_warning(s, "reiserfs-2500",
185                                                  "cannot turn on journaled "
186                                                  "quota: error %d", ret);
187                 }
188         }
189 #endif
190
191         done = 0;
192         REISERFS_SB(s)->s_is_unlinked_ok = 1;
193         while (!retval) {
194                 retval = search_item(s, &max_cpu_key, &path);
195                 if (retval != ITEM_NOT_FOUND) {
196                         reiserfs_error(s, "vs-2140",
197                                        "search_by_key returned %d", retval);
198                         break;
199                 }
200
201                 bh = get_last_bh(&path);
202                 item_pos = get_item_pos(&path);
203                 if (item_pos != B_NR_ITEMS(bh)) {
204                         reiserfs_warning(s, "vs-2060",
205                                          "wrong position found");
206                         break;
207                 }
208                 item_pos--;
209                 ih = B_N_PITEM_HEAD(bh, item_pos);
210
211                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
212                         /* there are no "save" links anymore */
213                         break;
214
215                 save_link_key = ih->ih_key;
216                 if (is_indirect_le_ih(ih))
217                         truncate = 1;
218                 else
219                         truncate = 0;
220
221                 /* reiserfs_iget needs k_dirid and k_objectid only */
222                 item = B_I_PITEM(bh, ih);
223                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
224                 obj_key.on_disk_key.k_objectid =
225                     le32_to_cpu(ih->ih_key.k_objectid);
226                 obj_key.on_disk_key.k_offset = 0;
227                 obj_key.on_disk_key.k_type = 0;
228
229                 pathrelse(&path);
230
231                 inode = reiserfs_iget(s, &obj_key);
232                 if (!inode) {
233                         /* the unlink almost completed, it just did not manage to remove
234                            "save" link and release objectid */
235                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
236                                          &obj_key);
237                         retval = remove_save_link_only(s, &save_link_key, 1);
238                         continue;
239                 }
240
241                 if (!truncate && inode->i_nlink) {
242                         /* file is not unlinked */
243                         reiserfs_warning(s, "vs-2185",
244                                          "file %K is not unlinked",
245                                          &obj_key);
246                         retval = remove_save_link_only(s, &save_link_key, 0);
247                         continue;
248                 }
249                 vfs_dq_init(inode);
250
251                 if (truncate && S_ISDIR(inode->i_mode)) {
252                         /* We got a truncate request for a dir which is impossible.
253                            The only imaginable way is to execute unfinished truncate request
254                            then boot into old kernel, remove the file and create dir with
255                            the same key. */
256                         reiserfs_warning(s, "green-2101",
257                                          "impossible truncate on a "
258                                          "directory %k. Please report",
259                                          INODE_PKEY(inode));
260                         retval = remove_save_link_only(s, &save_link_key, 0);
261                         truncate = 0;
262                         iput(inode);
263                         continue;
264                 }
265
266                 if (truncate) {
267                         REISERFS_I(inode)->i_flags |=
268                             i_link_saved_truncate_mask;
269                         /* not completed truncate found. New size was committed together
270                            with "save" link */
271                         reiserfs_info(s, "Truncating %k to %Ld ..",
272                                       INODE_PKEY(inode), inode->i_size);
273                         reiserfs_truncate_file(inode,
274                                                0
275                                                /*don't update modification time */
276                                                );
277                         retval = remove_save_link(inode, truncate);
278                 } else {
279                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
280                         /* not completed unlink (rmdir) found */
281                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
282                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
283                                         sizeof(last_inode_key))){
284                                 last_inode_key = *INODE_PKEY(inode);
285                                 /* removal gets completed in iput */
286                                 retval = 0;
287                         } else {
288                                 reiserfs_warning(s, "super-2189", "Dead loop "
289                                                  "in finish_unfinished "
290                                                  "detected, just remove "
291                                                  "save link\n");
292                                 retval = remove_save_link_only(s,
293                                                         &save_link_key, 0);
294                         }
295                 }
296
297                 iput(inode);
298                 printk("done\n");
299                 done++;
300         }
301         REISERFS_SB(s)->s_is_unlinked_ok = 0;
302
303 #ifdef CONFIG_QUOTA
304         /* Turn quotas off */
305         for (i = 0; i < MAXQUOTAS; i++) {
306                 if (sb_dqopt(s)->files[i])
307                         vfs_quota_off(s, i, 0);
308         }
309         if (ms_active_set)
310                 /* Restore the flag back */
311                 s->s_flags &= ~MS_ACTIVE;
312 #endif
313         pathrelse(&path);
314         if (done)
315                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
316                               "Completed\n", done);
317         return retval;
318 }
319
320 /* to protect file being unlinked from getting lost we "safe" link files
321    being unlinked. This link will be deleted in the same transaction with last
322    item of file. mounting the filesystem we scan all these links and remove
323    files which almost got lost */
324 void add_save_link(struct reiserfs_transaction_handle *th,
325                    struct inode *inode, int truncate)
326 {
327         INITIALIZE_PATH(path);
328         int retval;
329         struct cpu_key key;
330         struct item_head ih;
331         __le32 link;
332
333         BUG_ON(!th->t_trans_id);
334
335         /* file can only get one "save link" of each kind */
336         RFALSE(truncate &&
337                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
338                "saved link already exists for truncated inode %lx",
339                (long)inode->i_ino);
340         RFALSE(!truncate &&
341                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
342                "saved link already exists for unlinked inode %lx",
343                (long)inode->i_ino);
344
345         /* setup key of "save" link */
346         key.version = KEY_FORMAT_3_5;
347         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
348         key.on_disk_key.k_objectid = inode->i_ino;
349         if (!truncate) {
350                 /* unlink, rmdir, rename */
351                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
352                 set_cpu_key_k_type(&key, TYPE_DIRECT);
353
354                 /* item head of "safe" link */
355                 make_le_item_head(&ih, &key, key.version,
356                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
357                                   4 /*length */ , 0xffff /*free space */ );
358         } else {
359                 /* truncate */
360                 if (S_ISDIR(inode->i_mode))
361                         reiserfs_warning(inode->i_sb, "green-2102",
362                                          "Adding a truncate savelink for "
363                                          "a directory %k! Please report",
364                                          INODE_PKEY(inode));
365                 set_cpu_key_k_offset(&key, 1);
366                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
367
368                 /* item head of "safe" link */
369                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
370                                   4 /*length */ , 0 /*free space */ );
371         }
372         key.key_length = 3;
373
374         /* look for its place in the tree */
375         retval = search_item(inode->i_sb, &key, &path);
376         if (retval != ITEM_NOT_FOUND) {
377                 if (retval != -ENOSPC)
378                         reiserfs_error(inode->i_sb, "vs-2100",
379                                        "search_by_key (%K) returned %d", &key,
380                                        retval);
381                 pathrelse(&path);
382                 return;
383         }
384
385         /* body of "save" link */
386         link = INODE_PKEY(inode)->k_dir_id;
387
388         /* put "save" link inot tree, don't charge quota to anyone */
389         retval =
390             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
391         if (retval) {
392                 if (retval != -ENOSPC)
393                         reiserfs_error(inode->i_sb, "vs-2120",
394                                        "insert_item returned %d", retval);
395         } else {
396                 if (truncate)
397                         REISERFS_I(inode)->i_flags |=
398                             i_link_saved_truncate_mask;
399                 else
400                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
401         }
402 }
403
404 /* this opens transaction unlike add_save_link */
405 int remove_save_link(struct inode *inode, int truncate)
406 {
407         struct reiserfs_transaction_handle th;
408         struct reiserfs_key key;
409         int err;
410
411         /* we are going to do one balancing only */
412         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
413         if (err)
414                 return err;
415
416         /* setup key of "save" link */
417         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
418         key.k_objectid = INODE_PKEY(inode)->k_objectid;
419         if (!truncate) {
420                 /* unlink, rmdir, rename */
421                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
422                                     1 + inode->i_sb->s_blocksize);
423                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
424         } else {
425                 /* truncate */
426                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
427                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
428         }
429
430         if ((truncate &&
431              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
432             (!truncate &&
433              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
434                 /* don't take quota bytes from anywhere */
435                 reiserfs_delete_solid_item(&th, NULL, &key);
436         if (!truncate) {
437                 reiserfs_release_objectid(&th, inode->i_ino);
438                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
439         } else
440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
441
442         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
443 }
444
445 static void reiserfs_kill_sb(struct super_block *s)
446 {
447         if (REISERFS_SB(s)) {
448                 if (REISERFS_SB(s)->xattr_root) {
449                         d_invalidate(REISERFS_SB(s)->xattr_root);
450                         dput(REISERFS_SB(s)->xattr_root);
451                         REISERFS_SB(s)->xattr_root = NULL;
452                 }
453                 if (REISERFS_SB(s)->priv_root) {
454                         d_invalidate(REISERFS_SB(s)->priv_root);
455                         dput(REISERFS_SB(s)->priv_root);
456                         REISERFS_SB(s)->priv_root = NULL;
457                 }
458         }
459
460         kill_block_super(s);
461 }
462
463 static void reiserfs_put_super(struct super_block *s)
464 {
465         struct reiserfs_transaction_handle th;
466         th.t_trans_id = 0;
467
468         reiserfs_write_lock(s);
469
470         if (s->s_dirt)
471                 reiserfs_write_super(s);
472
473         /* change file system state to current state if it was mounted with read-write permissions */
474         if (!(s->s_flags & MS_RDONLY)) {
475                 if (!journal_begin(&th, s, 10)) {
476                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
477                                                      1);
478                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
479                                             REISERFS_SB(s)->s_mount_state);
480                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
481                 }
482         }
483
484         /* note, journal_release checks for readonly mount, and can decide not
485          ** to do a journal_end
486          */
487         journal_release(&th, s);
488
489         reiserfs_free_bitmap_cache(s);
490
491         brelse(SB_BUFFER_WITH_SB(s));
492
493         print_statistics(s);
494
495         if (REISERFS_SB(s)->reserved_blocks != 0) {
496                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
497                                  REISERFS_SB(s)->reserved_blocks);
498         }
499
500         reiserfs_proc_info_done(s);
501
502         reiserfs_write_unlock(s);
503         mutex_destroy(&REISERFS_SB(s)->lock);
504         kfree(s->s_fs_info);
505         s->s_fs_info = NULL;
506 }
507
508 static struct kmem_cache *reiserfs_inode_cachep;
509
510 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
511 {
512         struct reiserfs_inode_info *ei;
513         ei = (struct reiserfs_inode_info *)
514             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
515         if (!ei)
516                 return NULL;
517         return &ei->vfs_inode;
518 }
519
520 static void reiserfs_destroy_inode(struct inode *inode)
521 {
522         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
523 }
524
525 static void init_once(void *foo)
526 {
527         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
528
529         INIT_LIST_HEAD(&ei->i_prealloc_list);
530         inode_init_once(&ei->vfs_inode);
531 }
532
533 static int init_inodecache(void)
534 {
535         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
536                                                   sizeof(struct
537                                                          reiserfs_inode_info),
538                                                   0, (SLAB_RECLAIM_ACCOUNT|
539                                                         SLAB_MEM_SPREAD),
540                                                   init_once);
541         if (reiserfs_inode_cachep == NULL)
542                 return -ENOMEM;
543         return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548         kmem_cache_destroy(reiserfs_inode_cachep);
549 }
550
551 /* we don't mark inodes dirty, we just log them */
552 static void reiserfs_dirty_inode(struct inode *inode)
553 {
554         struct reiserfs_transaction_handle th;
555
556         int err = 0;
557         int lock_depth;
558
559         if (inode->i_sb->s_flags & MS_RDONLY) {
560                 reiserfs_warning(inode->i_sb, "clm-6006",
561                                  "writing inode %lu on readonly FS",
562                                  inode->i_ino);
563                 return;
564         }
565         lock_depth = reiserfs_write_lock_once(inode->i_sb);
566
567         /* this is really only used for atime updates, so they don't have
568          ** to be included in O_SYNC or fsync
569          */
570         err = journal_begin(&th, inode->i_sb, 1);
571         if (err)
572                 goto out;
573
574         reiserfs_update_sd(&th, inode);
575         journal_end(&th, inode->i_sb, 1);
576
577 out:
578         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
579 }
580
581 #ifdef CONFIG_QUOTA
582 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
583                                     size_t, loff_t);
584 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
585                                    loff_t);
586 #endif
587
588 static const struct super_operations reiserfs_sops = {
589         .alloc_inode = reiserfs_alloc_inode,
590         .destroy_inode = reiserfs_destroy_inode,
591         .write_inode = reiserfs_write_inode,
592         .dirty_inode = reiserfs_dirty_inode,
593         .delete_inode = reiserfs_delete_inode,
594         .put_super = reiserfs_put_super,
595         .write_super = reiserfs_write_super,
596         .sync_fs = reiserfs_sync_fs,
597         .freeze_fs = reiserfs_freeze,
598         .unfreeze_fs = reiserfs_unfreeze,
599         .statfs = reiserfs_statfs,
600         .remount_fs = reiserfs_remount,
601         .show_options = generic_show_options,
602 #ifdef CONFIG_QUOTA
603         .quota_read = reiserfs_quota_read,
604         .quota_write = reiserfs_quota_write,
605 #endif
606 };
607
608 #ifdef CONFIG_QUOTA
609 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
610
611 static int reiserfs_write_dquot(struct dquot *);
612 static int reiserfs_acquire_dquot(struct dquot *);
613 static int reiserfs_release_dquot(struct dquot *);
614 static int reiserfs_mark_dquot_dirty(struct dquot *);
615 static int reiserfs_write_info(struct super_block *, int);
616 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
617
618 static const struct dquot_operations reiserfs_quota_operations = {
619         .initialize = dquot_initialize,
620         .drop = dquot_drop,
621         .write_dquot = reiserfs_write_dquot,
622         .acquire_dquot = reiserfs_acquire_dquot,
623         .release_dquot = reiserfs_release_dquot,
624         .mark_dirty = reiserfs_mark_dquot_dirty,
625         .write_info = reiserfs_write_info,
626         .alloc_dquot    = dquot_alloc,
627         .destroy_dquot  = dquot_destroy,
628 };
629
630 static const struct quotactl_ops reiserfs_qctl_operations = {
631         .quota_on = reiserfs_quota_on,
632         .quota_off = vfs_quota_off,
633         .quota_sync = vfs_quota_sync,
634         .get_info = vfs_get_dqinfo,
635         .set_info = vfs_set_dqinfo,
636         .get_dqblk = vfs_get_dqblk,
637         .set_dqblk = vfs_set_dqblk,
638 };
639 #endif
640
641 static const struct export_operations reiserfs_export_ops = {
642         .encode_fh = reiserfs_encode_fh,
643         .fh_to_dentry = reiserfs_fh_to_dentry,
644         .fh_to_parent = reiserfs_fh_to_parent,
645         .get_parent = reiserfs_get_parent,
646 };
647
648 /* this struct is used in reiserfs_getopt () for containing the value for those
649    mount options that have values rather than being toggles. */
650 typedef struct {
651         char *value;
652         int setmask;            /* bitmask which is to set on mount_options bitmask when this
653                                    value is found, 0 is no bits are to be changed. */
654         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
655                                    value is found, 0 is no bits are to be changed. This is
656                                    applied BEFORE setmask */
657 } arg_desc_t;
658
659 /* Set this bit in arg_required to allow empty arguments */
660 #define REISERFS_OPT_ALLOWEMPTY 31
661
662 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
663    mount options */
664 typedef struct {
665         char *option_name;
666         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
667         const arg_desc_t *values;       /* list of values accepted by an option */
668         int setmask;            /* bitmask which is to set on mount_options bitmask when this
669                                    value is found, 0 is no bits are to be changed. */
670         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
671                                    value is found, 0 is no bits are to be changed. This is
672                                    applied BEFORE setmask */
673 } opt_desc_t;
674
675 /* possible values for -o data= */
676 static const arg_desc_t logging_mode[] = {
677         {"ordered", 1 << REISERFS_DATA_ORDERED,
678          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
679         {"journal", 1 << REISERFS_DATA_LOG,
680          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
681         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
682          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
683         {.value = NULL}
684 };
685
686 /* possible values for -o barrier= */
687 static const arg_desc_t barrier_mode[] = {
688         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
689         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
690         {.value = NULL}
691 };
692
693 /* possible values for "-o block-allocator=" and bits which are to be set in
694    s_mount_opt of reiserfs specific part of in-core super block */
695 static const arg_desc_t balloc[] = {
696         {"noborder", 1 << REISERFS_NO_BORDER, 0},
697         {"border", 0, 1 << REISERFS_NO_BORDER},
698         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
699         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
700         {"test4", 1 << REISERFS_TEST4, 0},
701         {"notest4", 0, 1 << REISERFS_TEST4},
702         {NULL, 0, 0}
703 };
704
705 static const arg_desc_t tails[] = {
706         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
707         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
708         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
709         {NULL, 0, 0}
710 };
711
712 static const arg_desc_t error_actions[] = {
713         {"panic", 1 << REISERFS_ERROR_PANIC,
714          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
715         {"ro-remount", 1 << REISERFS_ERROR_RO,
716          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
717 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
718         {"continue", 1 << REISERFS_ERROR_CONTINUE,
719          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
720 #endif
721         {NULL, 0, 0},
722 };
723
724 /* proceed only one option from a list *cur - string containing of mount options
725    opts - array of options which are accepted
726    opt_arg - if option is found and requires an argument and if it is specifed
727    in the input - pointer to the argument is stored here
728    bit_flags - if option requires to set a certain bit - it is set here
729    return -1 if unknown option is found, opt->arg_required otherwise */
730 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
731                            char **opt_arg, unsigned long *bit_flags)
732 {
733         char *p;
734         /* foo=bar,
735            ^   ^  ^
736            |   |  +-- option_end
737            |   +-- arg_start
738            +-- option_start
739          */
740         const opt_desc_t *opt;
741         const arg_desc_t *arg;
742
743         p = *cur;
744
745         /* assume argument cannot contain commas */
746         *cur = strchr(p, ',');
747         if (*cur) {
748                 *(*cur) = '\0';
749                 (*cur)++;
750         }
751
752         if (!strncmp(p, "alloc=", 6)) {
753                 /* Ugly special case, probably we should redo options parser so that
754                    it can understand several arguments for some options, also so that
755                    it can fill several bitfields with option values. */
756                 if (reiserfs_parse_alloc_options(s, p + 6)) {
757                         return -1;
758                 } else {
759                         return 0;
760                 }
761         }
762
763         /* for every option in the list */
764         for (opt = opts; opt->option_name; opt++) {
765                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
766                         if (bit_flags) {
767                                 if (opt->clrmask ==
768                                     (1 << REISERFS_UNSUPPORTED_OPT))
769                                         reiserfs_warning(s, "super-6500",
770                                                          "%s not supported.\n",
771                                                          p);
772                                 else
773                                         *bit_flags &= ~opt->clrmask;
774                                 if (opt->setmask ==
775                                     (1 << REISERFS_UNSUPPORTED_OPT))
776                                         reiserfs_warning(s, "super-6501",
777                                                          "%s not supported.\n",
778                                                          p);
779                                 else
780                                         *bit_flags |= opt->setmask;
781                         }
782                         break;
783                 }
784         }
785         if (!opt->option_name) {
786                 reiserfs_warning(s, "super-6502",
787                                  "unknown mount option \"%s\"", p);
788                 return -1;
789         }
790
791         p += strlen(opt->option_name);
792         switch (*p) {
793         case '=':
794                 if (!opt->arg_required) {
795                         reiserfs_warning(s, "super-6503",
796                                          "the option \"%s\" does not "
797                                          "require an argument\n",
798                                          opt->option_name);
799                         return -1;
800                 }
801                 break;
802
803         case 0:
804                 if (opt->arg_required) {
805                         reiserfs_warning(s, "super-6504",
806                                          "the option \"%s\" requires an "
807                                          "argument\n", opt->option_name);
808                         return -1;
809                 }
810                 break;
811         default:
812                 reiserfs_warning(s, "super-6505",
813                                  "head of option \"%s\" is only correct\n",
814                                  opt->option_name);
815                 return -1;
816         }
817
818         /* move to the argument, or to next option if argument is not required */
819         p++;
820
821         if (opt->arg_required
822             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
823             && !strlen(p)) {
824                 /* this catches "option=," if not allowed */
825                 reiserfs_warning(s, "super-6506",
826                                  "empty argument for \"%s\"\n",
827                                  opt->option_name);
828                 return -1;
829         }
830
831         if (!opt->values) {
832                 /* *=NULLopt_arg contains pointer to argument */
833                 *opt_arg = p;
834                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
835         }
836
837         /* values possible for this option are listed in opt->values */
838         for (arg = opt->values; arg->value; arg++) {
839                 if (!strcmp(p, arg->value)) {
840                         if (bit_flags) {
841                                 *bit_flags &= ~arg->clrmask;
842                                 *bit_flags |= arg->setmask;
843                         }
844                         return opt->arg_required;
845                 }
846         }
847
848         reiserfs_warning(s, "super-6506",
849                          "bad value \"%s\" for option \"%s\"\n", p,
850                          opt->option_name);
851         return -1;
852 }
853
854 /* returns 0 if something is wrong in option string, 1 - otherwise */
855 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
856                                   unsigned long *mount_options,
857                                   /* after the parsing phase, contains the
858                                      collection of bitflags defining what
859                                      mount options were selected. */
860                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
861                                   char **jdev_name,
862                                   unsigned int *commit_max_age,
863                                   char **qf_names,
864                                   unsigned int *qfmt)
865 {
866         int c;
867         char *arg = NULL;
868         char *pos;
869         opt_desc_t opts[] = {
870                 /* Compatibility stuff, so that -o notail for old setups still work */
871                 {"tails",.arg_required = 't',.values = tails},
872                 {"notail",.clrmask =
873                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
874                 {"conv",.setmask = 1 << REISERFS_CONVERT},
875                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
876                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
877                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
878 #ifdef CONFIG_REISERFS_FS_XATTR
879                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
880                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
881 #else
882                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
883                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
884 #endif
885 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
886                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
887                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
888 #else
889                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
890                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 #endif
892                 {.option_name = "nolog"},
893                 {"replayonly",.setmask = 1 << REPLAYONLY},
894                 {"block-allocator",.arg_required = 'a',.values = balloc},
895                 {"data",.arg_required = 'd',.values = logging_mode},
896                 {"barrier",.arg_required = 'b',.values = barrier_mode},
897                 {"resize",.arg_required = 'r',.values = NULL},
898                 {"jdev",.arg_required = 'j',.values = NULL},
899                 {"nolargeio",.arg_required = 'w',.values = NULL},
900                 {"commit",.arg_required = 'c',.values = NULL},
901                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
902                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
903                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
904                 {"errors",.arg_required = 'e',.values = error_actions},
905                 {"usrjquota",.arg_required =
906                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
907                 {"grpjquota",.arg_required =
908                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
909                 {"jqfmt",.arg_required = 'f',.values = NULL},
910                 {.option_name = NULL}
911         };
912
913         *blocks = 0;
914         if (!options || !*options)
915                 /* use default configuration: create tails, journaling on, no
916                    conversion to newest format */
917                 return 1;
918
919         for (pos = options; pos;) {
920                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
921                 if (c == -1)
922                         /* wrong option is given */
923                         return 0;
924
925                 if (c == 'r') {
926                         char *p;
927
928                         p = NULL;
929                         /* "resize=NNN" or "resize=auto" */
930
931                         if (!strcmp(arg, "auto")) {
932                                 /* From JFS code, to auto-get the size. */
933                                 *blocks =
934                                     s->s_bdev->bd_inode->i_size >> s->
935                                     s_blocksize_bits;
936                         } else {
937                                 *blocks = simple_strtoul(arg, &p, 0);
938                                 if (*p != '\0') {
939                                         /* NNN does not look like a number */
940                                         reiserfs_warning(s, "super-6507",
941                                                          "bad value %s for "
942                                                          "-oresize\n", arg);
943                                         return 0;
944                                 }
945                         }
946                 }
947
948                 if (c == 'c') {
949                         char *p = NULL;
950                         unsigned long val = simple_strtoul(arg, &p, 0);
951                         /* commit=NNN (time in seconds) */
952                         if (*p != '\0' || val >= (unsigned int)-1) {
953                                 reiserfs_warning(s, "super-6508",
954                                                  "bad value %s for -ocommit\n",
955                                                  arg);
956                                 return 0;
957                         }
958                         *commit_max_age = (unsigned int)val;
959                 }
960
961                 if (c == 'w') {
962                         reiserfs_warning(s, "super-6509", "nolargeio option "
963                                          "is no longer supported");
964                         return 0;
965                 }
966
967                 if (c == 'j') {
968                         if (arg && *arg && jdev_name) {
969                                 if (*jdev_name) {       //Hm, already assigned?
970                                         reiserfs_warning(s, "super-6510",
971                                                          "journal device was "
972                                                          "already specified to "
973                                                          "be %s", *jdev_name);
974                                         return 0;
975                                 }
976                                 *jdev_name = arg;
977                         }
978                 }
979 #ifdef CONFIG_QUOTA
980                 if (c == 'u' || c == 'g') {
981                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
982
983                         if (sb_any_quota_loaded(s) &&
984                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
985                                 reiserfs_warning(s, "super-6511",
986                                                  "cannot change journaled "
987                                                  "quota options when quota "
988                                                  "turned on.");
989                                 return 0;
990                         }
991                         if (*arg) {     /* Some filename specified? */
992                                 if (REISERFS_SB(s)->s_qf_names[qtype]
993                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
994                                               arg)) {
995                                         reiserfs_warning(s, "super-6512",
996                                                          "%s quota file "
997                                                          "already specified.",
998                                                          QTYPE2NAME(qtype));
999                                         return 0;
1000                                 }
1001                                 if (strchr(arg, '/')) {
1002                                         reiserfs_warning(s, "super-6513",
1003                                                          "quotafile must be "
1004                                                          "on filesystem root.");
1005                                         return 0;
1006                                 }
1007                                 qf_names[qtype] =
1008                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1009                                 if (!qf_names[qtype]) {
1010                                         reiserfs_warning(s, "reiserfs-2502",
1011                                                          "not enough memory "
1012                                                          "for storing "
1013                                                          "quotafile name.");
1014                                         return 0;
1015                                 }
1016                                 strcpy(qf_names[qtype], arg);
1017                                 *mount_options |= 1 << REISERFS_QUOTA;
1018                         } else {
1019                                 if (qf_names[qtype] !=
1020                                     REISERFS_SB(s)->s_qf_names[qtype])
1021                                         kfree(qf_names[qtype]);
1022                                 qf_names[qtype] = NULL;
1023                         }
1024                 }
1025                 if (c == 'f') {
1026                         if (!strcmp(arg, "vfsold"))
1027                                 *qfmt = QFMT_VFS_OLD;
1028                         else if (!strcmp(arg, "vfsv0"))
1029                                 *qfmt = QFMT_VFS_V0;
1030                         else {
1031                                 reiserfs_warning(s, "super-6514",
1032                                                  "unknown quota format "
1033                                                  "specified.");
1034                                 return 0;
1035                         }
1036                         if (sb_any_quota_loaded(s) &&
1037                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1038                                 reiserfs_warning(s, "super-6515",
1039                                                  "cannot change journaled "
1040                                                  "quota options when quota "
1041                                                  "turned on.");
1042                                 return 0;
1043                         }
1044                 }
1045 #else
1046                 if (c == 'u' || c == 'g' || c == 'f') {
1047                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1048                                          "quota options not supported.");
1049                         return 0;
1050                 }
1051 #endif
1052         }
1053
1054 #ifdef CONFIG_QUOTA
1055         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1056             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1057                 reiserfs_warning(s, "super-6515",
1058                                  "journaled quota format not specified.");
1059                 return 0;
1060         }
1061         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1062         if (!(*mount_options & (1 << REISERFS_QUOTA))
1063             && sb_any_quota_loaded(s)) {
1064                 reiserfs_warning(s, "super-6516", "quota options must "
1065                                  "be present when quota is turned on.");
1066                 return 0;
1067         }
1068 #endif
1069
1070         return 1;
1071 }
1072
1073 static void switch_data_mode(struct super_block *s, unsigned long mode)
1074 {
1075         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1076                                          (1 << REISERFS_DATA_ORDERED) |
1077                                          (1 << REISERFS_DATA_WRITEBACK));
1078         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1079 }
1080
1081 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1082 {
1083         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1084                 if (!reiserfs_data_log(s)) {
1085                         switch_data_mode(s, REISERFS_DATA_LOG);
1086                         reiserfs_info(s, "switching to journaled data mode\n");
1087                 }
1088         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1089                 if (!reiserfs_data_ordered(s)) {
1090                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1091                         reiserfs_info(s, "switching to ordered data mode\n");
1092                 }
1093         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1094                 if (!reiserfs_data_writeback(s)) {
1095                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1096                         reiserfs_info(s, "switching to writeback data mode\n");
1097                 }
1098         }
1099 }
1100
1101 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1102 {
1103         int flush = (1 << REISERFS_BARRIER_FLUSH);
1104         int none = (1 << REISERFS_BARRIER_NONE);
1105         int all_barrier = flush | none;
1106
1107         if (bits & all_barrier) {
1108                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1109                 if (bits & flush) {
1110                         REISERFS_SB(s)->s_mount_opt |= flush;
1111                         printk("reiserfs: enabling write barrier flush mode\n");
1112                 } else if (bits & none) {
1113                         REISERFS_SB(s)->s_mount_opt |= none;
1114                         printk("reiserfs: write barriers turned off\n");
1115                 }
1116         }
1117 }
1118
1119 static void handle_attrs(struct super_block *s)
1120 {
1121         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1122
1123         if (reiserfs_attrs(s)) {
1124                 if (old_format_only(s)) {
1125                         reiserfs_warning(s, "super-6517", "cannot support "
1126                                          "attributes on 3.5.x disk format");
1127                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1128                         return;
1129                 }
1130                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1131                         reiserfs_warning(s, "super-6518", "cannot support "
1132                                          "attributes until flag is set in "
1133                                          "super-block");
1134                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1135                 }
1136         }
1137 }
1138
1139 #ifdef CONFIG_QUOTA
1140 static void handle_quota_files(struct super_block *s, char **qf_names,
1141                                unsigned int *qfmt)
1142 {
1143         int i;
1144
1145         for (i = 0; i < MAXQUOTAS; i++) {
1146                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1147                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1148                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1149         }
1150         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1151 }
1152 #endif
1153
1154 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1155 {
1156         struct reiserfs_super_block *rs;
1157         struct reiserfs_transaction_handle th;
1158         unsigned long blocks;
1159         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1160         unsigned long safe_mask = 0;
1161         unsigned int commit_max_age = (unsigned int)-1;
1162         struct reiserfs_journal *journal = SB_JOURNAL(s);
1163         char *new_opts = kstrdup(arg, GFP_KERNEL);
1164         int err;
1165         char *qf_names[MAXQUOTAS];
1166         unsigned int qfmt = 0;
1167 #ifdef CONFIG_QUOTA
1168         int i;
1169 #endif
1170
1171         reiserfs_write_lock(s);
1172
1173 #ifdef CONFIG_QUOTA
1174         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1175 #endif
1176
1177         rs = SB_DISK_SUPER_BLOCK(s);
1178
1179         if (!reiserfs_parse_options
1180             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1181             qf_names, &qfmt)) {
1182 #ifdef CONFIG_QUOTA
1183                 for (i = 0; i < MAXQUOTAS; i++)
1184                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1185                                 kfree(qf_names[i]);
1186 #endif
1187                 err = -EINVAL;
1188                 goto out_err;
1189         }
1190 #ifdef CONFIG_QUOTA
1191         handle_quota_files(s, qf_names, &qfmt);
1192 #endif
1193
1194         handle_attrs(s);
1195
1196         /* Add options that are safe here */
1197         safe_mask |= 1 << REISERFS_SMALLTAIL;
1198         safe_mask |= 1 << REISERFS_LARGETAIL;
1199         safe_mask |= 1 << REISERFS_NO_BORDER;
1200         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1201         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1202         safe_mask |= 1 << REISERFS_TEST4;
1203         safe_mask |= 1 << REISERFS_ATTRS;
1204         safe_mask |= 1 << REISERFS_XATTRS_USER;
1205         safe_mask |= 1 << REISERFS_POSIXACL;
1206         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1207         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1208         safe_mask |= 1 << REISERFS_ERROR_RO;
1209         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1210         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1211         safe_mask |= 1 << REISERFS_QUOTA;
1212
1213         /* Update the bitmask, taking care to keep
1214          * the bits we're not allowed to change here */
1215         REISERFS_SB(s)->s_mount_opt =
1216             (REISERFS_SB(s)->
1217              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1218
1219         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1220                 journal->j_max_commit_age = commit_max_age;
1221                 journal->j_max_trans_age = commit_max_age;
1222         } else if (commit_max_age == 0) {
1223                 /* 0 means restore defaults. */
1224                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1225                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1226         }
1227
1228         if (blocks) {
1229                 err = reiserfs_resize(s, blocks);
1230                 if (err != 0)
1231                         goto out_err;
1232         }
1233
1234         if (*mount_flags & MS_RDONLY) {
1235                 reiserfs_xattr_init(s, *mount_flags);
1236                 /* remount read-only */
1237                 if (s->s_flags & MS_RDONLY)
1238                         /* it is read-only already */
1239                         goto out_ok;
1240                 /* try to remount file system with read-only permissions */
1241                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1242                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1243                         goto out_ok;
1244                 }
1245
1246                 err = journal_begin(&th, s, 10);
1247                 if (err)
1248                         goto out_err;
1249
1250                 /* Mounting a rw partition read-only. */
1251                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1252                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1253                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1254         } else {
1255                 /* remount read-write */
1256                 if (!(s->s_flags & MS_RDONLY)) {
1257                         reiserfs_xattr_init(s, *mount_flags);
1258                         goto out_ok;    /* We are read-write already */
1259                 }
1260
1261                 if (reiserfs_is_journal_aborted(journal)) {
1262                         err = journal->j_errno;
1263                         goto out_err;
1264                 }
1265
1266                 handle_data_mode(s, mount_options);
1267                 handle_barrier_mode(s, mount_options);
1268                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1269                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1270                 err = journal_begin(&th, s, 10);
1271                 if (err)
1272                         goto out_err;
1273
1274                 /* Mount a partition which is read-only, read-write */
1275                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1276                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1277                 s->s_flags &= ~MS_RDONLY;
1278                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1279                 if (!old_format_only(s))
1280                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1281                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1282                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1283                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1284         }
1285         /* this will force a full flush of all journal lists */
1286         SB_JOURNAL(s)->j_must_wait = 1;
1287         err = journal_end(&th, s, 10);
1288         if (err)
1289                 goto out_err;
1290         s->s_dirt = 0;
1291
1292         if (!(*mount_flags & MS_RDONLY)) {
1293                 finish_unfinished(s);
1294                 reiserfs_xattr_init(s, *mount_flags);
1295         }
1296
1297 out_ok:
1298         replace_mount_options(s, new_opts);
1299         reiserfs_write_unlock(s);
1300         return 0;
1301
1302 out_err:
1303         kfree(new_opts);
1304         reiserfs_write_unlock(s);
1305         return err;
1306 }
1307
1308 static int read_super_block(struct super_block *s, int offset)
1309 {
1310         struct buffer_head *bh;
1311         struct reiserfs_super_block *rs;
1312         int fs_blocksize;
1313
1314         bh = sb_bread(s, offset / s->s_blocksize);
1315         if (!bh) {
1316                 reiserfs_warning(s, "sh-2006",
1317                                  "bread failed (dev %s, block %lu, size %lu)",
1318                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1319                                  s->s_blocksize);
1320                 return 1;
1321         }
1322
1323         rs = (struct reiserfs_super_block *)bh->b_data;
1324         if (!is_any_reiserfs_magic_string(rs)) {
1325                 brelse(bh);
1326                 return 1;
1327         }
1328         //
1329         // ok, reiserfs signature (old or new) found in at the given offset
1330         //
1331         fs_blocksize = sb_blocksize(rs);
1332         brelse(bh);
1333         sb_set_blocksize(s, fs_blocksize);
1334
1335         bh = sb_bread(s, offset / s->s_blocksize);
1336         if (!bh) {
1337                 reiserfs_warning(s, "sh-2007",
1338                                  "bread failed (dev %s, block %lu, size %lu)",
1339                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1340                                  s->s_blocksize);
1341                 return 1;
1342         }
1343
1344         rs = (struct reiserfs_super_block *)bh->b_data;
1345         if (sb_blocksize(rs) != s->s_blocksize) {
1346                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1347                                  "filesystem on (dev %s, block %Lu, size %lu)",
1348                                  reiserfs_bdevname(s),
1349                                  (unsigned long long)bh->b_blocknr,
1350                                  s->s_blocksize);
1351                 brelse(bh);
1352                 return 1;
1353         }
1354
1355         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1356                 brelse(bh);
1357                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1358                                  "--rebuild-tree run detected. Please run\n"
1359                                  "reiserfsck --rebuild-tree and wait for a "
1360                                  "completion. If that fails\n"
1361                                  "get newer reiserfsprogs package");
1362                 return 1;
1363         }
1364
1365         SB_BUFFER_WITH_SB(s) = bh;
1366         SB_DISK_SUPER_BLOCK(s) = rs;
1367
1368         if (is_reiserfs_jr(rs)) {
1369                 /* magic is of non-standard journal filesystem, look at s_version to
1370                    find which format is in use */
1371                 if (sb_version(rs) == REISERFS_VERSION_2)
1372                         reiserfs_info(s, "found reiserfs format \"3.6\""
1373                                       " with non-standard journal\n");
1374                 else if (sb_version(rs) == REISERFS_VERSION_1)
1375                         reiserfs_info(s, "found reiserfs format \"3.5\""
1376                                       " with non-standard journal\n");
1377                 else {
1378                         reiserfs_warning(s, "sh-2012", "found unknown "
1379                                          "format \"%u\" of reiserfs with "
1380                                          "non-standard magic", sb_version(rs));
1381                         return 1;
1382                 }
1383         } else
1384                 /* s_version of standard format may contain incorrect information,
1385                    so we just look at the magic string */
1386                 reiserfs_info(s,
1387                               "found reiserfs format \"%s\" with standard journal\n",
1388                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1389
1390         s->s_op = &reiserfs_sops;
1391         s->s_export_op = &reiserfs_export_ops;
1392 #ifdef CONFIG_QUOTA
1393         s->s_qcop = &reiserfs_qctl_operations;
1394         s->dq_op = &reiserfs_quota_operations;
1395 #endif
1396
1397         /* new format is limited by the 32 bit wide i_blocks field, want to
1398          ** be one full block below that.
1399          */
1400         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1401         return 0;
1402 }
1403
1404 /* after journal replay, reread all bitmap and super blocks */
1405 static int reread_meta_blocks(struct super_block *s)
1406 {
1407         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1408         reiserfs_write_unlock(s);
1409         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1410         reiserfs_write_lock(s);
1411         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1412                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1413                 return 1;
1414         }
1415
1416         return 0;
1417 }
1418
1419 /////////////////////////////////////////////////////
1420 // hash detection stuff
1421
1422 // if root directory is empty - we set default - Yura's - hash and
1423 // warn about it
1424 // FIXME: we look for only one name in a directory. If tea and yura
1425 // bith have the same value - we ask user to send report to the
1426 // mailing list
1427 static __u32 find_hash_out(struct super_block *s)
1428 {
1429         int retval;
1430         struct inode *inode;
1431         struct cpu_key key;
1432         INITIALIZE_PATH(path);
1433         struct reiserfs_dir_entry de;
1434         __u32 hash = DEFAULT_HASH;
1435
1436         inode = s->s_root->d_inode;
1437
1438         do {                    // Some serious "goto"-hater was there ;)
1439                 u32 teahash, r5hash, yurahash;
1440
1441                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1442                 retval = search_by_entry_key(s, &key, &path, &de);
1443                 if (retval == IO_ERROR) {
1444                         pathrelse(&path);
1445                         return UNSET_HASH;
1446                 }
1447                 if (retval == NAME_NOT_FOUND)
1448                         de.de_entry_num--;
1449                 set_de_name_and_namelen(&de);
1450                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1451                         /* allow override in this case */
1452                         if (reiserfs_rupasov_hash(s)) {
1453                                 hash = YURA_HASH;
1454                         }
1455                         reiserfs_info(s, "FS seems to be empty, autodetect "
1456                                          "is using the default hash\n");
1457                         break;
1458                 }
1459                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1460                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1461                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1462                 if (((teahash == r5hash)
1463                      &&
1464                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1465                       == r5hash)) || ((teahash == yurahash)
1466                                       && (yurahash ==
1467                                           GET_HASH_VALUE(deh_offset
1468                                                          (&
1469                                                           (de.
1470                                                            de_deh[de.
1471                                                                   de_entry_num])))))
1472                     || ((r5hash == yurahash)
1473                         && (yurahash ==
1474                             GET_HASH_VALUE(deh_offset
1475                                            (&(de.de_deh[de.de_entry_num])))))) {
1476                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1477                                          "automatically detect hash function. "
1478                                          "Please mount with -o "
1479                                          "hash={tea,rupasov,r5}");
1480                         hash = UNSET_HASH;
1481                         break;
1482                 }
1483                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1484                     yurahash)
1485                         hash = YURA_HASH;
1486                 else if (GET_HASH_VALUE
1487                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1488                         hash = TEA_HASH;
1489                 else if (GET_HASH_VALUE
1490                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1491                         hash = R5_HASH;
1492                 else {
1493                         reiserfs_warning(s, "reiserfs-2506",
1494                                          "Unrecognised hash function");
1495                         hash = UNSET_HASH;
1496                 }
1497         } while (0);
1498
1499         pathrelse(&path);
1500         return hash;
1501 }
1502
1503 // finds out which hash names are sorted with
1504 static int what_hash(struct super_block *s)
1505 {
1506         __u32 code;
1507
1508         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1509
1510         /* reiserfs_hash_detect() == true if any of the hash mount options
1511          ** were used.  We must check them to make sure the user isn't
1512          ** using a bad hash value
1513          */
1514         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1515                 code = find_hash_out(s);
1516
1517         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1518                 /* detection has found the hash, and we must check against the
1519                  ** mount options
1520                  */
1521                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1522                         reiserfs_warning(s, "reiserfs-2507",
1523                                          "Error, %s hash detected, "
1524                                          "unable to force rupasov hash",
1525                                          reiserfs_hashname(code));
1526                         code = UNSET_HASH;
1527                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1528                         reiserfs_warning(s, "reiserfs-2508",
1529                                          "Error, %s hash detected, "
1530                                          "unable to force tea hash",
1531                                          reiserfs_hashname(code));
1532                         code = UNSET_HASH;
1533                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1534                         reiserfs_warning(s, "reiserfs-2509",
1535                                          "Error, %s hash detected, "
1536                                          "unable to force r5 hash",
1537                                          reiserfs_hashname(code));
1538                         code = UNSET_HASH;
1539                 }
1540         } else {
1541                 /* find_hash_out was not called or could not determine the hash */
1542                 if (reiserfs_rupasov_hash(s)) {
1543                         code = YURA_HASH;
1544                 } else if (reiserfs_tea_hash(s)) {
1545                         code = TEA_HASH;
1546                 } else if (reiserfs_r5_hash(s)) {
1547                         code = R5_HASH;
1548                 }
1549         }
1550
1551         /* if we are mounted RW, and we have a new valid hash code, update
1552          ** the super
1553          */
1554         if (code != UNSET_HASH &&
1555             !(s->s_flags & MS_RDONLY) &&
1556             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1557                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1558         }
1559         return code;
1560 }
1561
1562 // return pointer to appropriate function
1563 static hashf_t hash_function(struct super_block *s)
1564 {
1565         switch (what_hash(s)) {
1566         case TEA_HASH:
1567                 reiserfs_info(s, "Using tea hash to sort names\n");
1568                 return keyed_hash;
1569         case YURA_HASH:
1570                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1571                 return yura_hash;
1572         case R5_HASH:
1573                 reiserfs_info(s, "Using r5 hash to sort names\n");
1574                 return r5_hash;
1575         }
1576         return NULL;
1577 }
1578
1579 // this is used to set up correct value for old partitions
1580 static int function2code(hashf_t func)
1581 {
1582         if (func == keyed_hash)
1583                 return TEA_HASH;
1584         if (func == yura_hash)
1585                 return YURA_HASH;
1586         if (func == r5_hash)
1587                 return R5_HASH;
1588
1589         BUG();                  // should never happen
1590
1591         return 0;
1592 }
1593
1594 #define SWARN(silent, s, id, ...)                       \
1595         if (!(silent))                          \
1596                 reiserfs_warning(s, id, __VA_ARGS__)
1597
1598 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1599 {
1600         struct inode *root_inode;
1601         struct reiserfs_transaction_handle th;
1602         int old_format = 0;
1603         unsigned long blocks;
1604         unsigned int commit_max_age = 0;
1605         int jinit_done = 0;
1606         struct reiserfs_iget_args args;
1607         struct reiserfs_super_block *rs;
1608         char *jdev_name;
1609         struct reiserfs_sb_info *sbi;
1610         int errval = -EINVAL;
1611         char *qf_names[MAXQUOTAS] = {};
1612         unsigned int qfmt = 0;
1613
1614         save_mount_options(s, data);
1615
1616         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1617         if (!sbi) {
1618                 errval = -ENOMEM;
1619                 goto error_alloc;
1620         }
1621         s->s_fs_info = sbi;
1622         /* Set default values for options: non-aggressive tails, RO on errors */
1623         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1624         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1625         /* no preallocation minimum, be smart in
1626            reiserfs_file_write instead */
1627         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1628         /* Preallocate by 16 blocks (17-1) at once */
1629         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1630         /* setup default block allocator options */
1631         reiserfs_init_alloc_options(s);
1632
1633         mutex_init(&REISERFS_SB(s)->lock);
1634         REISERFS_SB(s)->lock_depth = -1;
1635
1636         /*
1637          * This function is called with the bkl, which also was the old
1638          * locking used here.
1639          * do_journal_begin() will soon check if we hold the lock (ie: was the
1640          * bkl). This is likely because do_journal_begin() has several another
1641          * callers because at this time, it doesn't seem to be necessary to
1642          * protect against anything.
1643          * Anyway, let's be conservative and lock for now.
1644          */
1645         reiserfs_write_lock(s);
1646
1647         jdev_name = NULL;
1648         if (reiserfs_parse_options
1649             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1650              &commit_max_age, qf_names, &qfmt) == 0) {
1651                 goto error;
1652         }
1653 #ifdef CONFIG_QUOTA
1654         handle_quota_files(s, qf_names, &qfmt);
1655 #endif
1656
1657         if (blocks) {
1658                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1659                 goto error;
1660         }
1661
1662         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1663         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1664                 old_format = 1;
1665         /* try new format (64-th 1k block), which can contain reiserfs super block */
1666         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1667                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1668                       reiserfs_bdevname(s));
1669                 goto error;
1670         }
1671
1672         rs = SB_DISK_SUPER_BLOCK(s);
1673         /* Let's do basic sanity check to verify that underlying device is not
1674            smaller than the filesystem. If the check fails then abort and scream,
1675            because bad stuff will happen otherwise. */
1676         if (s->s_bdev && s->s_bdev->bd_inode
1677             && i_size_read(s->s_bdev->bd_inode) <
1678             sb_block_count(rs) * sb_blocksize(rs)) {
1679                 SWARN(silent, s, "", "Filesystem cannot be "
1680                       "mounted because it is bigger than the device");
1681                 SWARN(silent, s, "", "You may need to run fsck "
1682                       "or increase size of your LVM partition");
1683                 SWARN(silent, s, "", "Or may be you forgot to "
1684                       "reboot after fdisk when it told you to");
1685                 goto error;
1686         }
1687
1688         sbi->s_mount_state = SB_REISERFS_STATE(s);
1689         sbi->s_mount_state = REISERFS_VALID_FS;
1690
1691         if ((errval = reiserfs_init_bitmap_cache(s))) {
1692                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1693                 goto error;
1694         }
1695         errval = -EINVAL;
1696 #ifdef CONFIG_REISERFS_CHECK
1697         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1698         SWARN(silent, s, "", "- it is slow mode for debugging.");
1699 #endif
1700
1701         /* make data=ordered the default */
1702         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1703             !reiserfs_data_writeback(s)) {
1704                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1705         }
1706
1707         if (reiserfs_data_log(s)) {
1708                 reiserfs_info(s, "using journaled data mode\n");
1709         } else if (reiserfs_data_ordered(s)) {
1710                 reiserfs_info(s, "using ordered data mode\n");
1711         } else {
1712                 reiserfs_info(s, "using writeback data mode\n");
1713         }
1714         if (reiserfs_barrier_flush(s)) {
1715                 printk("reiserfs: using flush barriers\n");
1716         }
1717         // set_device_ro(s->s_dev, 1) ;
1718         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1719                 SWARN(silent, s, "sh-2022",
1720                       "unable to initialize journal space");
1721                 goto error;
1722         } else {
1723                 jinit_done = 1; /* once this is set, journal_release must be called
1724                                  ** if we error out of the mount
1725                                  */
1726         }
1727         if (reread_meta_blocks(s)) {
1728                 SWARN(silent, s, "jmacd-9",
1729                       "unable to reread meta blocks after journal init");
1730                 goto error;
1731         }
1732
1733         if (replay_only(s))
1734                 goto error;
1735
1736         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1737                 SWARN(silent, s, "clm-7000",
1738                       "Detected readonly device, marking FS readonly");
1739                 s->s_flags |= MS_RDONLY;
1740         }
1741         args.objectid = REISERFS_ROOT_OBJECTID;
1742         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1743         root_inode =
1744             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1745                          reiserfs_init_locked_inode, (void *)(&args));
1746         if (!root_inode) {
1747                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1748                 goto error;
1749         }
1750
1751         if (root_inode->i_state & I_NEW) {
1752                 reiserfs_read_locked_inode(root_inode, &args);
1753                 unlock_new_inode(root_inode);
1754         }
1755
1756         s->s_root = d_alloc_root(root_inode);
1757         if (!s->s_root) {
1758                 iput(root_inode);
1759                 goto error;
1760         }
1761         // define and initialize hash function
1762         sbi->s_hash_function = hash_function(s);
1763         if (sbi->s_hash_function == NULL) {
1764                 dput(s->s_root);
1765                 s->s_root = NULL;
1766                 goto error;
1767         }
1768
1769         if (is_reiserfs_3_5(rs)
1770             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1771                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1772         else if (old_format)
1773                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1774         else
1775                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1776
1777         if (!(s->s_flags & MS_RDONLY)) {
1778
1779                 errval = journal_begin(&th, s, 1);
1780                 if (errval) {
1781                         dput(s->s_root);
1782                         s->s_root = NULL;
1783                         goto error;
1784                 }
1785                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1786
1787                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1788                 set_sb_fs_state(rs, 0);
1789
1790                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1791                  * case, but older revisions can't. This will cause the
1792                  * file system to fail mount on those older implementations,
1793                  * avoiding corruption. -jeffm */
1794                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1795                     sb_bmap_nr(rs) != 0) {
1796                         reiserfs_warning(s, "super-2030", "This file system "
1797                                         "claims to use %u bitmap blocks in "
1798                                         "its super block, but requires %u. "
1799                                         "Clearing to zero.", sb_bmap_nr(rs),
1800                                         reiserfs_bmap_count(s));
1801
1802                         set_sb_bmap_nr(rs, 0);
1803                 }
1804
1805                 if (old_format_only(s)) {
1806                         /* filesystem of format 3.5 either with standard or non-standard
1807                            journal */
1808                         if (convert_reiserfs(s)) {
1809                                 /* and -o conv is given */
1810                                 if (!silent)
1811                                         reiserfs_info(s,
1812                                                       "converting 3.5 filesystem to the 3.6 format");
1813
1814                                 if (is_reiserfs_3_5(rs))
1815                                         /* put magic string of 3.6 format. 2.2 will not be able to
1816                                            mount this filesystem anymore */
1817                                         memcpy(rs->s_v1.s_magic,
1818                                                reiserfs_3_6_magic_string,
1819                                                sizeof
1820                                                (reiserfs_3_6_magic_string));
1821
1822                                 set_sb_version(rs, REISERFS_VERSION_2);
1823                                 reiserfs_convert_objectid_map_v1(s);
1824                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1825                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1826                         } else if (!silent) {
1827                                 reiserfs_info(s, "using 3.5.x disk format\n");
1828                         }
1829                 } else
1830                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1831
1832
1833                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1834                 errval = journal_end(&th, s, 1);
1835                 if (errval) {
1836                         dput(s->s_root);
1837                         s->s_root = NULL;
1838                         goto error;
1839                 }
1840
1841                 if ((errval = reiserfs_lookup_privroot(s)) ||
1842                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1843                         dput(s->s_root);
1844                         s->s_root = NULL;
1845                         goto error;
1846                 }
1847
1848                 /* look for files which were to be removed in previous session */
1849                 finish_unfinished(s);
1850         } else {
1851                 if (old_format_only(s) && !silent) {
1852                         reiserfs_info(s, "using 3.5.x disk format\n");
1853                 }
1854
1855                 if ((errval = reiserfs_lookup_privroot(s)) ||
1856                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1857                         dput(s->s_root);
1858                         s->s_root = NULL;
1859                         goto error;
1860                 }
1861         }
1862         // mark hash in super block: it could be unset. overwrite should be ok
1863         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1864
1865         handle_attrs(s);
1866
1867         reiserfs_proc_info_init(s);
1868
1869         init_waitqueue_head(&(sbi->s_wait));
1870         spin_lock_init(&sbi->bitmap_lock);
1871
1872         reiserfs_write_unlock(s);
1873
1874         return (0);
1875
1876 error:
1877         reiserfs_write_unlock(s);
1878 error_alloc:
1879         if (jinit_done) {       /* kill the commit thread, free journal ram */
1880                 journal_release_error(NULL, s);
1881         }
1882
1883         reiserfs_free_bitmap_cache(s);
1884         if (SB_BUFFER_WITH_SB(s))
1885                 brelse(SB_BUFFER_WITH_SB(s));
1886 #ifdef CONFIG_QUOTA
1887         {
1888                 int j;
1889                 for (j = 0; j < MAXQUOTAS; j++)
1890                         kfree(qf_names[j]);
1891         }
1892 #endif
1893         kfree(sbi);
1894
1895         s->s_fs_info = NULL;
1896         return errval;
1897 }
1898
1899 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1900 {
1901         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1902
1903         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1904         buf->f_bfree = sb_free_blocks(rs);
1905         buf->f_bavail = buf->f_bfree;
1906         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1907         buf->f_bsize = dentry->d_sb->s_blocksize;
1908         /* changed to accommodate gcc folks. */
1909         buf->f_type = REISERFS_SUPER_MAGIC;
1910         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1911         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1912                                 sizeof(rs->s_uuid)/2);
1913
1914         return 0;
1915 }
1916
1917 #ifdef CONFIG_QUOTA
1918 static int reiserfs_write_dquot(struct dquot *dquot)
1919 {
1920         struct reiserfs_transaction_handle th;
1921         int ret, err;
1922
1923         reiserfs_write_lock(dquot->dq_sb);
1924         ret =
1925             journal_begin(&th, dquot->dq_sb,
1926                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1927         if (ret)
1928                 goto out;
1929         ret = dquot_commit(dquot);
1930         err =
1931             journal_end(&th, dquot->dq_sb,
1932                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1933         if (!ret && err)
1934                 ret = err;
1935       out:
1936         reiserfs_write_unlock(dquot->dq_sb);
1937         return ret;
1938 }
1939
1940 static int reiserfs_acquire_dquot(struct dquot *dquot)
1941 {
1942         struct reiserfs_transaction_handle th;
1943         int ret, err;
1944
1945         reiserfs_write_lock(dquot->dq_sb);
1946         ret =
1947             journal_begin(&th, dquot->dq_sb,
1948                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1949         if (ret)
1950                 goto out;
1951         ret = dquot_acquire(dquot);
1952         err =
1953             journal_end(&th, dquot->dq_sb,
1954                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1955         if (!ret && err)
1956                 ret = err;
1957       out:
1958         reiserfs_write_unlock(dquot->dq_sb);
1959         return ret;
1960 }
1961
1962 static int reiserfs_release_dquot(struct dquot *dquot)
1963 {
1964         struct reiserfs_transaction_handle th;
1965         int ret, err;
1966
1967         reiserfs_write_lock(dquot->dq_sb);
1968         ret =
1969             journal_begin(&th, dquot->dq_sb,
1970                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1971         if (ret) {
1972                 /* Release dquot anyway to avoid endless cycle in dqput() */
1973                 dquot_release(dquot);
1974                 goto out;
1975         }
1976         ret = dquot_release(dquot);
1977         err =
1978             journal_end(&th, dquot->dq_sb,
1979                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1980         if (!ret && err)
1981                 ret = err;
1982       out:
1983         reiserfs_write_unlock(dquot->dq_sb);
1984         return ret;
1985 }
1986
1987 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1988 {
1989         /* Are we journaling quotas? */
1990         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1991             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1992                 dquot_mark_dquot_dirty(dquot);
1993                 return reiserfs_write_dquot(dquot);
1994         } else
1995                 return dquot_mark_dquot_dirty(dquot);
1996 }
1997
1998 static int reiserfs_write_info(struct super_block *sb, int type)
1999 {
2000         struct reiserfs_transaction_handle th;
2001         int ret, err;
2002
2003         /* Data block + inode block */
2004         reiserfs_write_lock(sb);
2005         ret = journal_begin(&th, sb, 2);
2006         if (ret)
2007                 goto out;
2008         ret = dquot_commit_info(sb, type);
2009         err = journal_end(&th, sb, 2);
2010         if (!ret && err)
2011                 ret = err;
2012       out:
2013         reiserfs_write_unlock(sb);
2014         return ret;
2015 }
2016
2017 /*
2018  * Turn on quotas during mount time - we need to find the quota file and such...
2019  */
2020 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2021 {
2022         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2023                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2024 }
2025
2026 /*
2027  * Standard function to be called on quota_on
2028  */
2029 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2030                              char *name, int remount)
2031 {
2032         int err;
2033         struct path path;
2034         struct inode *inode;
2035         struct reiserfs_transaction_handle th;
2036
2037         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2038                 return -EINVAL;
2039         /* No more checks needed? Path and format_id are bogus anyway... */
2040         if (remount)
2041                 return vfs_quota_on(sb, type, format_id, name, 1);
2042         err = kern_path(name, LOOKUP_FOLLOW, &path);
2043         if (err)
2044                 return err;
2045         /* Quotafile not on the same filesystem? */
2046         if (path.mnt->mnt_sb != sb) {
2047                 err = -EXDEV;
2048                 goto out;
2049         }
2050         inode = path.dentry->d_inode;
2051         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2052         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2053                 err = reiserfs_unpack(inode, NULL);
2054                 if (err) {
2055                         reiserfs_warning(sb, "super-6520",
2056                                 "Unpacking tail of quota file failed"
2057                                 " (%d). Cannot turn on quotas.", err);
2058                         err = -EINVAL;
2059                         goto out;
2060                 }
2061                 mark_inode_dirty(inode);
2062         }
2063         /* Journaling quota? */
2064         if (REISERFS_SB(sb)->s_qf_names[type]) {
2065                 /* Quotafile not of fs root? */
2066                 if (path.dentry->d_parent != sb->s_root)
2067                         reiserfs_warning(sb, "super-6521",
2068                                  "Quota file not on filesystem root. "
2069                                  "Journalled quota will not work.");
2070         }
2071
2072         /*
2073          * When we journal data on quota file, we have to flush journal to see
2074          * all updates to the file when we bypass pagecache...
2075          */
2076         if (reiserfs_file_data_log(inode)) {
2077                 /* Just start temporary transaction and finish it */
2078                 err = journal_begin(&th, sb, 1);
2079                 if (err)
2080                         goto out;
2081                 err = journal_end_sync(&th, sb, 1);
2082                 if (err)
2083                         goto out;
2084         }
2085         err = vfs_quota_on_path(sb, type, format_id, &path);
2086 out:
2087         path_put(&path);
2088         return err;
2089 }
2090
2091 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2092  * acquiring the locks... As quota files are never truncated and quota code
2093  * itself serializes the operations (and noone else should touch the files)
2094  * we don't have to be afraid of races */
2095 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2096                                    size_t len, loff_t off)
2097 {
2098         struct inode *inode = sb_dqopt(sb)->files[type];
2099         unsigned long blk = off >> sb->s_blocksize_bits;
2100         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2101         size_t toread;
2102         struct buffer_head tmp_bh, *bh;
2103         loff_t i_size = i_size_read(inode);
2104
2105         if (off > i_size)
2106                 return 0;
2107         if (off + len > i_size)
2108                 len = i_size - off;
2109         toread = len;
2110         while (toread > 0) {
2111                 tocopy =
2112                     sb->s_blocksize - offset <
2113                     toread ? sb->s_blocksize - offset : toread;
2114                 tmp_bh.b_state = 0;
2115                 /* Quota files are without tails so we can safely use this function */
2116                 reiserfs_write_lock(sb);
2117                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2118                 reiserfs_write_unlock(sb);
2119                 if (err)
2120                         return err;
2121                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2122                         memset(data, 0, tocopy);
2123                 else {
2124                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2125                         if (!bh)
2126                                 return -EIO;
2127                         memcpy(data, bh->b_data + offset, tocopy);
2128                         brelse(bh);
2129                 }
2130                 offset = 0;
2131                 toread -= tocopy;
2132                 data += tocopy;
2133                 blk++;
2134         }
2135         return len;
2136 }
2137
2138 /* Write to quotafile (we know the transaction is already started and has
2139  * enough credits) */
2140 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2141                                     const char *data, size_t len, loff_t off)
2142 {
2143         struct inode *inode = sb_dqopt(sb)->files[type];
2144         unsigned long blk = off >> sb->s_blocksize_bits;
2145         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2146         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2147         size_t towrite = len;
2148         struct buffer_head tmp_bh, *bh;
2149
2150         if (!current->journal_info) {
2151                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2152                         " cancelled because transaction is not started.\n",
2153                         (unsigned long long)off, (unsigned long long)len);
2154                 return -EIO;
2155         }
2156         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2157         while (towrite > 0) {
2158                 tocopy = sb->s_blocksize - offset < towrite ?
2159                     sb->s_blocksize - offset : towrite;
2160                 tmp_bh.b_state = 0;
2161                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2162                 if (err)
2163                         goto out;
2164                 if (offset || tocopy != sb->s_blocksize)
2165                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2166                 else
2167                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2168                 if (!bh) {
2169                         err = -EIO;
2170                         goto out;
2171                 }
2172                 lock_buffer(bh);
2173                 memcpy(bh->b_data + offset, data, tocopy);
2174                 flush_dcache_page(bh->b_page);
2175                 set_buffer_uptodate(bh);
2176                 unlock_buffer(bh);
2177                 reiserfs_prepare_for_journal(sb, bh, 1);
2178                 journal_mark_dirty(current->journal_info, sb, bh);
2179                 if (!journal_quota)
2180                         reiserfs_add_ordered_list(inode, bh);
2181                 brelse(bh);
2182                 offset = 0;
2183                 towrite -= tocopy;
2184                 data += tocopy;
2185                 blk++;
2186         }
2187 out:
2188         if (len == towrite) {
2189                 mutex_unlock(&inode->i_mutex);
2190                 return err;
2191         }
2192         if (inode->i_size < off + len - towrite)
2193                 i_size_write(inode, off + len - towrite);
2194         inode->i_version++;
2195         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2196         mark_inode_dirty(inode);
2197         mutex_unlock(&inode->i_mutex);
2198         return len - towrite;
2199 }
2200
2201 #endif
2202
2203 static int get_super_block(struct file_system_type *fs_type,
2204                            int flags, const char *dev_name,
2205                            void *data, struct vfsmount *mnt)
2206 {
2207         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2208                            mnt);
2209 }
2210
2211 static int __init init_reiserfs_fs(void)
2212 {
2213         int ret;
2214
2215         if ((ret = init_inodecache())) {
2216                 return ret;
2217         }
2218
2219         reiserfs_proc_info_global_init();
2220
2221         ret = register_filesystem(&reiserfs_fs_type);
2222
2223         if (ret == 0) {
2224                 return 0;
2225         }
2226
2227         reiserfs_proc_info_global_done();
2228         destroy_inodecache();
2229
2230         return ret;
2231 }
2232
2233 static void __exit exit_reiserfs_fs(void)
2234 {
2235         reiserfs_proc_info_global_done();
2236         unregister_filesystem(&reiserfs_fs_type);
2237         destroy_inodecache();
2238 }
2239
2240 struct file_system_type reiserfs_fs_type = {
2241         .owner = THIS_MODULE,
2242         .name = "reiserfs",
2243         .get_sb = get_super_block,
2244         .kill_sb = reiserfs_kill_sb,
2245         .fs_flags = FS_REQUIRES_DEV,
2246 };
2247
2248 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2249 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2250 MODULE_LICENSE("GPL");
2251
2252 module_init(init_reiserfs_fs);
2253 module_exit(exit_reiserfs_fs);