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