Push BKL down into ->remount_fs()
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/smp_lock.h>
32
33 struct file_system_type reiserfs_fs_type;
34
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42                         strlen(reiserfs_3_5_magic_string));
43 }
44
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48                         strlen(reiserfs_3_6_magic_string));
49 }
50
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54                         strlen(reiserfs_jr_magic_string));
55 }
56
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60                 is_reiserfs_jr(rs));
61 }
62
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68         struct reiserfs_transaction_handle th;
69
70         reiserfs_write_lock(s);
71         if (!journal_begin(&th, s, 1))
72                 if (!journal_end_sync(&th, s, 1))
73                         reiserfs_flush_old_commits(s);
74         s->s_dirt = 0;  /* Even if it's not true.
75                          * We'll loop forever in sync_supers otherwise */
76         reiserfs_write_unlock(s);
77         return 0;
78 }
79
80 static void reiserfs_write_super(struct super_block *s)
81 {
82         reiserfs_sync_fs(s, 1);
83 }
84
85 static int reiserfs_freeze(struct super_block *s)
86 {
87         struct reiserfs_transaction_handle th;
88         reiserfs_write_lock(s);
89         if (!(s->s_flags & MS_RDONLY)) {
90                 int err = journal_begin(&th, s, 1);
91                 if (err) {
92                         reiserfs_block_writes(&th);
93                 } else {
94                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
95                                                      1);
96                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
97                         reiserfs_block_writes(&th);
98                         journal_end_sync(&th, s, 1);
99                 }
100         }
101         s->s_dirt = 0;
102         reiserfs_write_unlock(s);
103         return 0;
104 }
105
106 static int reiserfs_unfreeze(struct super_block *s)
107 {
108         reiserfs_allow_writes(s);
109         return 0;
110 }
111
112 extern const struct in_core_key MAX_IN_CORE_KEY;
113
114 /* this is used to delete "save link" when there are no items of a
115    file it points to. It can either happen if unlink is completed but
116    "save unlink" removal, or if file has both unlink and truncate
117    pending and as unlink completes first (because key of "save link"
118    protecting unlink is bigger that a key lf "save link" which
119    protects truncate), so there left no items to make truncate
120    completion on */
121 static int remove_save_link_only(struct super_block *s,
122                                  struct reiserfs_key *key, int oid_free)
123 {
124         struct reiserfs_transaction_handle th;
125         int err;
126
127         /* we are going to do one balancing */
128         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
129         if (err)
130                 return err;
131
132         reiserfs_delete_solid_item(&th, NULL, key);
133         if (oid_free)
134                 /* removals are protected by direct items */
135                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
136
137         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
138 }
139
140 #ifdef CONFIG_QUOTA
141 static int reiserfs_quota_on_mount(struct super_block *, int);
142 #endif
143
144 /* look for uncompleted unlinks and truncates and complete them */
145 static int finish_unfinished(struct super_block *s)
146 {
147         INITIALIZE_PATH(path);
148         struct cpu_key max_cpu_key, obj_key;
149         struct reiserfs_key save_link_key, last_inode_key;
150         int retval = 0;
151         struct item_head *ih;
152         struct buffer_head *bh;
153         int item_pos;
154         char *item;
155         int done;
156         struct inode *inode;
157         int truncate;
158 #ifdef CONFIG_QUOTA
159         int i;
160         int ms_active_set;
161 #endif
162
163         /* compose key to look for "save" links */
164         max_cpu_key.version = KEY_FORMAT_3_5;
165         max_cpu_key.on_disk_key.k_dir_id = ~0U;
166         max_cpu_key.on_disk_key.k_objectid = ~0U;
167         set_cpu_key_k_offset(&max_cpu_key, ~0U);
168         max_cpu_key.key_length = 3;
169
170         memset(&last_inode_key, 0, sizeof(last_inode_key));
171
172 #ifdef CONFIG_QUOTA
173         /* Needed for iput() to work correctly and not trash data */
174         if (s->s_flags & MS_ACTIVE) {
175                 ms_active_set = 0;
176         } else {
177                 ms_active_set = 1;
178                 s->s_flags |= MS_ACTIVE;
179         }
180         /* Turn on quotas so that they are updated correctly */
181         for (i = 0; i < MAXQUOTAS; i++) {
182                 if (REISERFS_SB(s)->s_qf_names[i]) {
183                         int ret = reiserfs_quota_on_mount(s, i);
184                         if (ret < 0)
185                                 reiserfs_warning(s, "reiserfs-2500",
186                                                  "cannot turn on journaled "
187                                                  "quota: error %d", ret);
188                 }
189         }
190 #endif
191
192         done = 0;
193         REISERFS_SB(s)->s_is_unlinked_ok = 1;
194         while (!retval) {
195                 retval = search_item(s, &max_cpu_key, &path);
196                 if (retval != ITEM_NOT_FOUND) {
197                         reiserfs_error(s, "vs-2140",
198                                        "search_by_key returned %d", 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, "vs-2060",
206                                          "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, "vs-2180", "iget failed for %K",
237                                          &obj_key);
238                         retval = remove_save_link_only(s, &save_link_key, 1);
239                         continue;
240                 }
241
242                 if (!truncate && inode->i_nlink) {
243                         /* file is not unlinked */
244                         reiserfs_warning(s, "vs-2185",
245                                          "file %K is not unlinked",
246                                          &obj_key);
247                         retval = remove_save_link_only(s, &save_link_key, 0);
248                         continue;
249                 }
250                 vfs_dq_init(inode);
251
252                 if (truncate && S_ISDIR(inode->i_mode)) {
253                         /* We got a truncate request for a dir which is impossible.
254                            The only imaginable way is to execute unfinished truncate request
255                            then boot into old kernel, remove the file and create dir with
256                            the same key. */
257                         reiserfs_warning(s, "green-2101",
258                                          "impossible truncate on a "
259                                          "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, "super-2189", "Dead loop "
290                                                  "in finish_unfinished "
291                                                  "detected, just remove "
292                                                  "save link\n");
293                                 retval = remove_save_link_only(s,
294                                                         &save_link_key, 0);
295                         }
296                 }
297
298                 iput(inode);
299                 printk("done\n");
300                 done++;
301         }
302         REISERFS_SB(s)->s_is_unlinked_ok = 0;
303
304 #ifdef CONFIG_QUOTA
305         /* Turn quotas off */
306         for (i = 0; i < MAXQUOTAS; i++) {
307                 if (sb_dqopt(s)->files[i])
308                         vfs_quota_off(s, i, 0);
309         }
310         if (ms_active_set)
311                 /* Restore the flag back */
312                 s->s_flags &= ~MS_ACTIVE;
313 #endif
314         pathrelse(&path);
315         if (done)
316                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
317                               "Completed\n", done);
318         return retval;
319 }
320
321 /* to protect file being unlinked from getting lost we "safe" link files
322    being unlinked. This link will be deleted in the same transaction with last
323    item of file. mounting the filesystem we scan all these links and remove
324    files which almost got lost */
325 void add_save_link(struct reiserfs_transaction_handle *th,
326                    struct inode *inode, int truncate)
327 {
328         INITIALIZE_PATH(path);
329         int retval;
330         struct cpu_key key;
331         struct item_head ih;
332         __le32 link;
333
334         BUG_ON(!th->t_trans_id);
335
336         /* file can only get one "save link" of each kind */
337         RFALSE(truncate &&
338                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
339                "saved link already exists for truncated inode %lx",
340                (long)inode->i_ino);
341         RFALSE(!truncate &&
342                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
343                "saved link already exists for unlinked inode %lx",
344                (long)inode->i_ino);
345
346         /* setup key of "save" link */
347         key.version = KEY_FORMAT_3_5;
348         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
349         key.on_disk_key.k_objectid = inode->i_ino;
350         if (!truncate) {
351                 /* unlink, rmdir, rename */
352                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
353                 set_cpu_key_k_type(&key, TYPE_DIRECT);
354
355                 /* item head of "safe" link */
356                 make_le_item_head(&ih, &key, key.version,
357                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
358                                   4 /*length */ , 0xffff /*free space */ );
359         } else {
360                 /* truncate */
361                 if (S_ISDIR(inode->i_mode))
362                         reiserfs_warning(inode->i_sb, "green-2102",
363                                          "Adding a truncate savelink for "
364                                          "a directory %k! Please report",
365                                          INODE_PKEY(inode));
366                 set_cpu_key_k_offset(&key, 1);
367                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
368
369                 /* item head of "safe" link */
370                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
371                                   4 /*length */ , 0 /*free space */ );
372         }
373         key.key_length = 3;
374
375         /* look for its place in the tree */
376         retval = search_item(inode->i_sb, &key, &path);
377         if (retval != ITEM_NOT_FOUND) {
378                 if (retval != -ENOSPC)
379                         reiserfs_error(inode->i_sb, "vs-2100",
380                                        "search_by_key (%K) returned %d", &key,
381                                        retval);
382                 pathrelse(&path);
383                 return;
384         }
385
386         /* body of "save" link */
387         link = INODE_PKEY(inode)->k_dir_id;
388
389         /* put "save" link inot tree, don't charge quota to anyone */
390         retval =
391             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
392         if (retval) {
393                 if (retval != -ENOSPC)
394                         reiserfs_error(inode->i_sb, "vs-2120",
395                                        "insert_item returned %d", retval);
396         } else {
397                 if (truncate)
398                         REISERFS_I(inode)->i_flags |=
399                             i_link_saved_truncate_mask;
400                 else
401                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
402         }
403 }
404
405 /* this opens transaction unlike add_save_link */
406 int remove_save_link(struct inode *inode, int truncate)
407 {
408         struct reiserfs_transaction_handle th;
409         struct reiserfs_key key;
410         int err;
411
412         /* we are going to do one balancing only */
413         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
414         if (err)
415                 return err;
416
417         /* setup key of "save" link */
418         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
419         key.k_objectid = INODE_PKEY(inode)->k_objectid;
420         if (!truncate) {
421                 /* unlink, rmdir, rename */
422                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
423                                     1 + inode->i_sb->s_blocksize);
424                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
425         } else {
426                 /* truncate */
427                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
428                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
429         }
430
431         if ((truncate &&
432              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
433             (!truncate &&
434              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
435                 /* don't take quota bytes from anywhere */
436                 reiserfs_delete_solid_item(&th, NULL, &key);
437         if (!truncate) {
438                 reiserfs_release_objectid(&th, inode->i_ino);
439                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
440         } else
441                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
442
443         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
444 }
445
446 static void reiserfs_kill_sb(struct super_block *s)
447 {
448         if (REISERFS_SB(s)) {
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                 if (REISERFS_SB(s)->priv_root) {
455                         d_invalidate(REISERFS_SB(s)->priv_root);
456                         dput(REISERFS_SB(s)->priv_root);
457                         REISERFS_SB(s)->priv_root = NULL;
458                 }
459         }
460
461         kill_block_super(s);
462 }
463
464 static void reiserfs_put_super(struct super_block *s)
465 {
466         struct reiserfs_transaction_handle th;
467         th.t_trans_id = 0;
468
469         lock_kernel();
470
471         if (s->s_dirt)
472                 reiserfs_write_super(s);
473
474         /* change file system state to current state if it was mounted with read-write permissions */
475         if (!(s->s_flags & MS_RDONLY)) {
476                 if (!journal_begin(&th, s, 10)) {
477                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
478                                                      1);
479                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
480                                             REISERFS_SB(s)->s_mount_state);
481                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
482                 }
483         }
484
485         /* note, journal_release checks for readonly mount, and can decide not
486          ** to do a journal_end
487          */
488         journal_release(&th, s);
489
490         reiserfs_free_bitmap_cache(s);
491
492         brelse(SB_BUFFER_WITH_SB(s));
493
494         print_statistics(s);
495
496         if (REISERFS_SB(s)->reserved_blocks != 0) {
497                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
498                                  REISERFS_SB(s)->reserved_blocks);
499         }
500
501         reiserfs_proc_info_done(s);
502
503         kfree(s->s_fs_info);
504         s->s_fs_info = NULL;
505
506         unlock_kernel();
507 }
508
509 static struct kmem_cache *reiserfs_inode_cachep;
510
511 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
512 {
513         struct reiserfs_inode_info *ei;
514         ei = (struct reiserfs_inode_info *)
515             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
516         if (!ei)
517                 return NULL;
518         return &ei->vfs_inode;
519 }
520
521 static void reiserfs_destroy_inode(struct inode *inode)
522 {
523         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
524 }
525
526 static void init_once(void *foo)
527 {
528         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
529
530         INIT_LIST_HEAD(&ei->i_prealloc_list);
531         inode_init_once(&ei->vfs_inode);
532 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
533         ei->i_acl_access = NULL;
534         ei->i_acl_default = NULL;
535 #endif
536 }
537
538 static int init_inodecache(void)
539 {
540         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
541                                                   sizeof(struct
542                                                          reiserfs_inode_info),
543                                                   0, (SLAB_RECLAIM_ACCOUNT|
544                                                         SLAB_MEM_SPREAD),
545                                                   init_once);
546         if (reiserfs_inode_cachep == NULL)
547                 return -ENOMEM;
548         return 0;
549 }
550
551 static void destroy_inodecache(void)
552 {
553         kmem_cache_destroy(reiserfs_inode_cachep);
554 }
555
556 /* we don't mark inodes dirty, we just log them */
557 static void reiserfs_dirty_inode(struct inode *inode)
558 {
559         struct reiserfs_transaction_handle th;
560
561         int err = 0;
562         if (inode->i_sb->s_flags & MS_RDONLY) {
563                 reiserfs_warning(inode->i_sb, "clm-6006",
564                                  "writing inode %lu on readonly FS",
565                                  inode->i_ino);
566                 return;
567         }
568         reiserfs_write_lock(inode->i_sb);
569
570         /* this is really only used for atime updates, so they don't have
571          ** to be included in O_SYNC or fsync
572          */
573         err = journal_begin(&th, inode->i_sb, 1);
574         if (err) {
575                 reiserfs_write_unlock(inode->i_sb);
576                 return;
577         }
578         reiserfs_update_sd(&th, inode);
579         journal_end(&th, inode->i_sb, 1);
580         reiserfs_write_unlock(inode->i_sb);
581 }
582
583 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
584 static void reiserfs_clear_inode(struct inode *inode)
585 {
586         struct posix_acl *acl;
587
588         acl = REISERFS_I(inode)->i_acl_access;
589         if (acl && !IS_ERR(acl))
590                 posix_acl_release(acl);
591         REISERFS_I(inode)->i_acl_access = NULL;
592
593         acl = REISERFS_I(inode)->i_acl_default;
594         if (acl && !IS_ERR(acl))
595                 posix_acl_release(acl);
596         REISERFS_I(inode)->i_acl_default = NULL;
597 }
598 #else
599 #define reiserfs_clear_inode NULL
600 #endif
601
602 #ifdef CONFIG_QUOTA
603 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
604                                     size_t, loff_t);
605 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
606                                    loff_t);
607 #endif
608
609 static const struct super_operations reiserfs_sops = {
610         .alloc_inode = reiserfs_alloc_inode,
611         .destroy_inode = reiserfs_destroy_inode,
612         .write_inode = reiserfs_write_inode,
613         .dirty_inode = reiserfs_dirty_inode,
614         .delete_inode = reiserfs_delete_inode,
615         .clear_inode = reiserfs_clear_inode,
616         .put_super = reiserfs_put_super,
617         .write_super = reiserfs_write_super,
618         .sync_fs = reiserfs_sync_fs,
619         .freeze_fs = reiserfs_freeze,
620         .unfreeze_fs = reiserfs_unfreeze,
621         .statfs = reiserfs_statfs,
622         .remount_fs = reiserfs_remount,
623         .show_options = generic_show_options,
624 #ifdef CONFIG_QUOTA
625         .quota_read = reiserfs_quota_read,
626         .quota_write = reiserfs_quota_write,
627 #endif
628 };
629
630 #ifdef CONFIG_QUOTA
631 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
632
633 static int reiserfs_write_dquot(struct dquot *);
634 static int reiserfs_acquire_dquot(struct dquot *);
635 static int reiserfs_release_dquot(struct dquot *);
636 static int reiserfs_mark_dquot_dirty(struct dquot *);
637 static int reiserfs_write_info(struct super_block *, int);
638 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
639
640 static struct dquot_operations reiserfs_quota_operations = {
641         .initialize = dquot_initialize,
642         .drop = dquot_drop,
643         .alloc_space = dquot_alloc_space,
644         .alloc_inode = dquot_alloc_inode,
645         .free_space = dquot_free_space,
646         .free_inode = dquot_free_inode,
647         .transfer = dquot_transfer,
648         .write_dquot = reiserfs_write_dquot,
649         .acquire_dquot = reiserfs_acquire_dquot,
650         .release_dquot = reiserfs_release_dquot,
651         .mark_dirty = reiserfs_mark_dquot_dirty,
652         .write_info = reiserfs_write_info,
653         .alloc_dquot    = dquot_alloc,
654         .destroy_dquot  = dquot_destroy,
655 };
656
657 static struct quotactl_ops reiserfs_qctl_operations = {
658         .quota_on = reiserfs_quota_on,
659         .quota_off = vfs_quota_off,
660         .quota_sync = vfs_quota_sync,
661         .get_info = vfs_get_dqinfo,
662         .set_info = vfs_set_dqinfo,
663         .get_dqblk = vfs_get_dqblk,
664         .set_dqblk = vfs_set_dqblk,
665 };
666 #endif
667
668 static const struct export_operations reiserfs_export_ops = {
669         .encode_fh = reiserfs_encode_fh,
670         .fh_to_dentry = reiserfs_fh_to_dentry,
671         .fh_to_parent = reiserfs_fh_to_parent,
672         .get_parent = reiserfs_get_parent,
673 };
674
675 /* this struct is used in reiserfs_getopt () for containing the value for those
676    mount options that have values rather than being toggles. */
677 typedef struct {
678         char *value;
679         int setmask;            /* bitmask which is to set on mount_options bitmask when this
680                                    value is found, 0 is no bits are to be changed. */
681         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
682                                    value is found, 0 is no bits are to be changed. This is
683                                    applied BEFORE setmask */
684 } arg_desc_t;
685
686 /* Set this bit in arg_required to allow empty arguments */
687 #define REISERFS_OPT_ALLOWEMPTY 31
688
689 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
690    mount options */
691 typedef struct {
692         char *option_name;
693         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
694         const arg_desc_t *values;       /* list of values accepted by an option */
695         int setmask;            /* bitmask which is to set on mount_options bitmask when this
696                                    value is found, 0 is no bits are to be changed. */
697         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
698                                    value is found, 0 is no bits are to be changed. This is
699                                    applied BEFORE setmask */
700 } opt_desc_t;
701
702 /* possible values for -o data= */
703 static const arg_desc_t logging_mode[] = {
704         {"ordered", 1 << REISERFS_DATA_ORDERED,
705          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
706         {"journal", 1 << REISERFS_DATA_LOG,
707          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
708         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
709          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
710         {.value = NULL}
711 };
712
713 /* possible values for -o barrier= */
714 static const arg_desc_t barrier_mode[] = {
715         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
716         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
717         {.value = NULL}
718 };
719
720 /* possible values for "-o block-allocator=" and bits which are to be set in
721    s_mount_opt of reiserfs specific part of in-core super block */
722 static const arg_desc_t balloc[] = {
723         {"noborder", 1 << REISERFS_NO_BORDER, 0},
724         {"border", 0, 1 << REISERFS_NO_BORDER},
725         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
726         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
727         {"test4", 1 << REISERFS_TEST4, 0},
728         {"notest4", 0, 1 << REISERFS_TEST4},
729         {NULL, 0, 0}
730 };
731
732 static const arg_desc_t tails[] = {
733         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
734         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
735         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
736         {NULL, 0, 0}
737 };
738
739 static const arg_desc_t error_actions[] = {
740         {"panic", 1 << REISERFS_ERROR_PANIC,
741          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
742         {"ro-remount", 1 << REISERFS_ERROR_RO,
743          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
744 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
745         {"continue", 1 << REISERFS_ERROR_CONTINUE,
746          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
747 #endif
748         {NULL, 0, 0},
749 };
750
751 /* proceed only one option from a list *cur - string containing of mount options
752    opts - array of options which are accepted
753    opt_arg - if option is found and requires an argument and if it is specifed
754    in the input - pointer to the argument is stored here
755    bit_flags - if option requires to set a certain bit - it is set here
756    return -1 if unknown option is found, opt->arg_required otherwise */
757 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
758                            char **opt_arg, unsigned long *bit_flags)
759 {
760         char *p;
761         /* foo=bar,
762            ^   ^  ^
763            |   |  +-- option_end
764            |   +-- arg_start
765            +-- option_start
766          */
767         const opt_desc_t *opt;
768         const arg_desc_t *arg;
769
770         p = *cur;
771
772         /* assume argument cannot contain commas */
773         *cur = strchr(p, ',');
774         if (*cur) {
775                 *(*cur) = '\0';
776                 (*cur)++;
777         }
778
779         if (!strncmp(p, "alloc=", 6)) {
780                 /* Ugly special case, probably we should redo options parser so that
781                    it can understand several arguments for some options, also so that
782                    it can fill several bitfields with option values. */
783                 if (reiserfs_parse_alloc_options(s, p + 6)) {
784                         return -1;
785                 } else {
786                         return 0;
787                 }
788         }
789
790         /* for every option in the list */
791         for (opt = opts; opt->option_name; opt++) {
792                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
793                         if (bit_flags) {
794                                 if (opt->clrmask ==
795                                     (1 << REISERFS_UNSUPPORTED_OPT))
796                                         reiserfs_warning(s, "super-6500",
797                                                          "%s not supported.\n",
798                                                          p);
799                                 else
800                                         *bit_flags &= ~opt->clrmask;
801                                 if (opt->setmask ==
802                                     (1 << REISERFS_UNSUPPORTED_OPT))
803                                         reiserfs_warning(s, "super-6501",
804                                                          "%s not supported.\n",
805                                                          p);
806                                 else
807                                         *bit_flags |= opt->setmask;
808                         }
809                         break;
810                 }
811         }
812         if (!opt->option_name) {
813                 reiserfs_warning(s, "super-6502",
814                                  "unknown mount option \"%s\"", p);
815                 return -1;
816         }
817
818         p += strlen(opt->option_name);
819         switch (*p) {
820         case '=':
821                 if (!opt->arg_required) {
822                         reiserfs_warning(s, "super-6503",
823                                          "the option \"%s\" does not "
824                                          "require an argument\n",
825                                          opt->option_name);
826                         return -1;
827                 }
828                 break;
829
830         case 0:
831                 if (opt->arg_required) {
832                         reiserfs_warning(s, "super-6504",
833                                          "the option \"%s\" requires an "
834                                          "argument\n", opt->option_name);
835                         return -1;
836                 }
837                 break;
838         default:
839                 reiserfs_warning(s, "super-6505",
840                                  "head of option \"%s\" is only correct\n",
841                                  opt->option_name);
842                 return -1;
843         }
844
845         /* move to the argument, or to next option if argument is not required */
846         p++;
847
848         if (opt->arg_required
849             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
850             && !strlen(p)) {
851                 /* this catches "option=," if not allowed */
852                 reiserfs_warning(s, "super-6506",
853                                  "empty argument for \"%s\"\n",
854                                  opt->option_name);
855                 return -1;
856         }
857
858         if (!opt->values) {
859                 /* *=NULLopt_arg contains pointer to argument */
860                 *opt_arg = p;
861                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
862         }
863
864         /* values possible for this option are listed in opt->values */
865         for (arg = opt->values; arg->value; arg++) {
866                 if (!strcmp(p, arg->value)) {
867                         if (bit_flags) {
868                                 *bit_flags &= ~arg->clrmask;
869                                 *bit_flags |= arg->setmask;
870                         }
871                         return opt->arg_required;
872                 }
873         }
874
875         reiserfs_warning(s, "super-6506",
876                          "bad value \"%s\" for option \"%s\"\n", p,
877                          opt->option_name);
878         return -1;
879 }
880
881 /* returns 0 if something is wrong in option string, 1 - otherwise */
882 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
883                                   unsigned long *mount_options,
884                                   /* after the parsing phase, contains the
885                                      collection of bitflags defining what
886                                      mount options were selected. */
887                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
888                                   char **jdev_name,
889                                   unsigned int *commit_max_age,
890                                   char **qf_names,
891                                   unsigned int *qfmt)
892 {
893         int c;
894         char *arg = NULL;
895         char *pos;
896         opt_desc_t opts[] = {
897                 /* Compatibility stuff, so that -o notail for old setups still work */
898                 {"tails",.arg_required = 't',.values = tails},
899                 {"notail",.clrmask =
900                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
901                 {"conv",.setmask = 1 << REISERFS_CONVERT},
902                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
903                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
904                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
905 #ifdef CONFIG_REISERFS_FS_XATTR
906                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
907                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
908 #else
909                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
910                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
911 #endif
912 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
913                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
914                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
915 #else
916                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
917                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
918 #endif
919                 {.option_name = "nolog"},
920                 {"replayonly",.setmask = 1 << REPLAYONLY},
921                 {"block-allocator",.arg_required = 'a',.values = balloc},
922                 {"data",.arg_required = 'd',.values = logging_mode},
923                 {"barrier",.arg_required = 'b',.values = barrier_mode},
924                 {"resize",.arg_required = 'r',.values = NULL},
925                 {"jdev",.arg_required = 'j',.values = NULL},
926                 {"nolargeio",.arg_required = 'w',.values = NULL},
927                 {"commit",.arg_required = 'c',.values = NULL},
928                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
929                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
930                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
931                 {"errors",.arg_required = 'e',.values = error_actions},
932                 {"usrjquota",.arg_required =
933                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
934                 {"grpjquota",.arg_required =
935                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
936                 {"jqfmt",.arg_required = 'f',.values = NULL},
937                 {.option_name = NULL}
938         };
939
940         *blocks = 0;
941         if (!options || !*options)
942                 /* use default configuration: create tails, journaling on, no
943                    conversion to newest format */
944                 return 1;
945
946         for (pos = options; pos;) {
947                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
948                 if (c == -1)
949                         /* wrong option is given */
950                         return 0;
951
952                 if (c == 'r') {
953                         char *p;
954
955                         p = NULL;
956                         /* "resize=NNN" or "resize=auto" */
957
958                         if (!strcmp(arg, "auto")) {
959                                 /* From JFS code, to auto-get the size. */
960                                 *blocks =
961                                     s->s_bdev->bd_inode->i_size >> s->
962                                     s_blocksize_bits;
963                         } else {
964                                 *blocks = simple_strtoul(arg, &p, 0);
965                                 if (*p != '\0') {
966                                         /* NNN does not look like a number */
967                                         reiserfs_warning(s, "super-6507",
968                                                          "bad value %s for "
969                                                          "-oresize\n", arg);
970                                         return 0;
971                                 }
972                         }
973                 }
974
975                 if (c == 'c') {
976                         char *p = NULL;
977                         unsigned long val = simple_strtoul(arg, &p, 0);
978                         /* commit=NNN (time in seconds) */
979                         if (*p != '\0' || val >= (unsigned int)-1) {
980                                 reiserfs_warning(s, "super-6508",
981                                                  "bad value %s for -ocommit\n",
982                                                  arg);
983                                 return 0;
984                         }
985                         *commit_max_age = (unsigned int)val;
986                 }
987
988                 if (c == 'w') {
989                         reiserfs_warning(s, "super-6509", "nolargeio option "
990                                          "is no longer supported");
991                         return 0;
992                 }
993
994                 if (c == 'j') {
995                         if (arg && *arg && jdev_name) {
996                                 if (*jdev_name) {       //Hm, already assigned?
997                                         reiserfs_warning(s, "super-6510",
998                                                          "journal device was "
999                                                          "already specified to "
1000                                                          "be %s", *jdev_name);
1001                                         return 0;
1002                                 }
1003                                 *jdev_name = arg;
1004                         }
1005                 }
1006 #ifdef CONFIG_QUOTA
1007                 if (c == 'u' || c == 'g') {
1008                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1009
1010                         if (sb_any_quota_loaded(s) &&
1011                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1012                                 reiserfs_warning(s, "super-6511",
1013                                                  "cannot change journaled "
1014                                                  "quota options when quota "
1015                                                  "turned on.");
1016                                 return 0;
1017                         }
1018                         if (*arg) {     /* Some filename specified? */
1019                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1020                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1021                                               arg)) {
1022                                         reiserfs_warning(s, "super-6512",
1023                                                          "%s quota file "
1024                                                          "already specified.",
1025                                                          QTYPE2NAME(qtype));
1026                                         return 0;
1027                                 }
1028                                 if (strchr(arg, '/')) {
1029                                         reiserfs_warning(s, "super-6513",
1030                                                          "quotafile must be "
1031                                                          "on filesystem root.");
1032                                         return 0;
1033                                 }
1034                                 qf_names[qtype] =
1035                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1036                                 if (!qf_names[qtype]) {
1037                                         reiserfs_warning(s, "reiserfs-2502",
1038                                                          "not enough memory "
1039                                                          "for storing "
1040                                                          "quotafile name.");
1041                                         return 0;
1042                                 }
1043                                 strcpy(qf_names[qtype], arg);
1044                                 *mount_options |= 1 << REISERFS_QUOTA;
1045                         } else {
1046                                 if (qf_names[qtype] !=
1047                                     REISERFS_SB(s)->s_qf_names[qtype])
1048                                         kfree(qf_names[qtype]);
1049                                 qf_names[qtype] = NULL;
1050                         }
1051                 }
1052                 if (c == 'f') {
1053                         if (!strcmp(arg, "vfsold"))
1054                                 *qfmt = QFMT_VFS_OLD;
1055                         else if (!strcmp(arg, "vfsv0"))
1056                                 *qfmt = QFMT_VFS_V0;
1057                         else {
1058                                 reiserfs_warning(s, "super-6514",
1059                                                  "unknown quota format "
1060                                                  "specified.");
1061                                 return 0;
1062                         }
1063                         if (sb_any_quota_loaded(s) &&
1064                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1065                                 reiserfs_warning(s, "super-6515",
1066                                                  "cannot change journaled "
1067                                                  "quota options when quota "
1068                                                  "turned on.");
1069                                 return 0;
1070                         }
1071                 }
1072 #else
1073                 if (c == 'u' || c == 'g' || c == 'f') {
1074                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1075                                          "quota options not supported.");
1076                         return 0;
1077                 }
1078 #endif
1079         }
1080
1081 #ifdef CONFIG_QUOTA
1082         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1083             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1084                 reiserfs_warning(s, "super-6515",
1085                                  "journaled quota format not specified.");
1086                 return 0;
1087         }
1088         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1089         if (!(*mount_options & (1 << REISERFS_QUOTA))
1090             && sb_any_quota_loaded(s)) {
1091                 reiserfs_warning(s, "super-6516", "quota options must "
1092                                  "be present when quota is turned on.");
1093                 return 0;
1094         }
1095 #endif
1096
1097         return 1;
1098 }
1099
1100 static void switch_data_mode(struct super_block *s, unsigned long mode)
1101 {
1102         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1103                                          (1 << REISERFS_DATA_ORDERED) |
1104                                          (1 << REISERFS_DATA_WRITEBACK));
1105         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1106 }
1107
1108 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1109 {
1110         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1111                 if (!reiserfs_data_log(s)) {
1112                         switch_data_mode(s, REISERFS_DATA_LOG);
1113                         reiserfs_info(s, "switching to journaled data mode\n");
1114                 }
1115         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1116                 if (!reiserfs_data_ordered(s)) {
1117                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1118                         reiserfs_info(s, "switching to ordered data mode\n");
1119                 }
1120         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1121                 if (!reiserfs_data_writeback(s)) {
1122                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1123                         reiserfs_info(s, "switching to writeback data mode\n");
1124                 }
1125         }
1126 }
1127
1128 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1129 {
1130         int flush = (1 << REISERFS_BARRIER_FLUSH);
1131         int none = (1 << REISERFS_BARRIER_NONE);
1132         int all_barrier = flush | none;
1133
1134         if (bits & all_barrier) {
1135                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1136                 if (bits & flush) {
1137                         REISERFS_SB(s)->s_mount_opt |= flush;
1138                         printk("reiserfs: enabling write barrier flush mode\n");
1139                 } else if (bits & none) {
1140                         REISERFS_SB(s)->s_mount_opt |= none;
1141                         printk("reiserfs: write barriers turned off\n");
1142                 }
1143         }
1144 }
1145
1146 static void handle_attrs(struct super_block *s)
1147 {
1148         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1149
1150         if (reiserfs_attrs(s)) {
1151                 if (old_format_only(s)) {
1152                         reiserfs_warning(s, "super-6517", "cannot support "
1153                                          "attributes on 3.5.x disk format");
1154                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1155                         return;
1156                 }
1157                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1158                         reiserfs_warning(s, "super-6518", "cannot support "
1159                                          "attributes until flag is set in "
1160                                          "super-block");
1161                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1162                 }
1163         }
1164 }
1165
1166 #ifdef CONFIG_QUOTA
1167 static void handle_quota_files(struct super_block *s, char **qf_names,
1168                                unsigned int *qfmt)
1169 {
1170         int i;
1171
1172         for (i = 0; i < MAXQUOTAS; i++) {
1173                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1174                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1175                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1176         }
1177         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1178 }
1179 #endif
1180
1181 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1182 {
1183         struct reiserfs_super_block *rs;
1184         struct reiserfs_transaction_handle th;
1185         unsigned long blocks;
1186         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1187         unsigned long safe_mask = 0;
1188         unsigned int commit_max_age = (unsigned int)-1;
1189         struct reiserfs_journal *journal = SB_JOURNAL(s);
1190         char *new_opts = kstrdup(arg, GFP_KERNEL);
1191         int err;
1192         char *qf_names[MAXQUOTAS];
1193         unsigned int qfmt = 0;
1194 #ifdef CONFIG_QUOTA
1195         int i;
1196
1197         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1198 #endif
1199
1200         lock_kernel();
1201         rs = SB_DISK_SUPER_BLOCK(s);
1202
1203         if (!reiserfs_parse_options
1204             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1205             qf_names, &qfmt)) {
1206 #ifdef CONFIG_QUOTA
1207                 for (i = 0; i < MAXQUOTAS; i++)
1208                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1209                                 kfree(qf_names[i]);
1210 #endif
1211                 err = -EINVAL;
1212                 goto out_err;
1213         }
1214 #ifdef CONFIG_QUOTA
1215         handle_quota_files(s, qf_names, &qfmt);
1216 #endif
1217
1218         handle_attrs(s);
1219
1220         /* Add options that are safe here */
1221         safe_mask |= 1 << REISERFS_SMALLTAIL;
1222         safe_mask |= 1 << REISERFS_LARGETAIL;
1223         safe_mask |= 1 << REISERFS_NO_BORDER;
1224         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1225         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1226         safe_mask |= 1 << REISERFS_TEST4;
1227         safe_mask |= 1 << REISERFS_ATTRS;
1228         safe_mask |= 1 << REISERFS_XATTRS_USER;
1229         safe_mask |= 1 << REISERFS_POSIXACL;
1230         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1231         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1232         safe_mask |= 1 << REISERFS_ERROR_RO;
1233         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1234         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1235         safe_mask |= 1 << REISERFS_QUOTA;
1236
1237         /* Update the bitmask, taking care to keep
1238          * the bits we're not allowed to change here */
1239         REISERFS_SB(s)->s_mount_opt =
1240             (REISERFS_SB(s)->
1241              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1242
1243         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1244                 journal->j_max_commit_age = commit_max_age;
1245                 journal->j_max_trans_age = commit_max_age;
1246         } else if (commit_max_age == 0) {
1247                 /* 0 means restore defaults. */
1248                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1249                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1250         }
1251
1252         if (blocks) {
1253                 err = reiserfs_resize(s, blocks);
1254                 if (err != 0)
1255                         goto out_err;
1256         }
1257
1258         if (*mount_flags & MS_RDONLY) {
1259                 reiserfs_xattr_init(s, *mount_flags);
1260                 /* remount read-only */
1261                 if (s->s_flags & MS_RDONLY)
1262                         /* it is read-only already */
1263                         goto out_ok;
1264                 /* try to remount file system with read-only permissions */
1265                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1266                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1267                         goto out_ok;
1268                 }
1269
1270                 err = journal_begin(&th, s, 10);
1271                 if (err)
1272                         goto out_err;
1273
1274                 /* Mounting a rw partition read-only. */
1275                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1276                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1277                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1278         } else {
1279                 /* remount read-write */
1280                 if (!(s->s_flags & MS_RDONLY)) {
1281                         reiserfs_xattr_init(s, *mount_flags);
1282                         goto out_ok;    /* We are read-write already */
1283                 }
1284
1285                 if (reiserfs_is_journal_aborted(journal)) {
1286                         err = journal->j_errno;
1287                         goto out_err;
1288                 }
1289
1290                 handle_data_mode(s, mount_options);
1291                 handle_barrier_mode(s, mount_options);
1292                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1293                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1294                 err = journal_begin(&th, s, 10);
1295                 if (err)
1296                         goto out_err;
1297
1298                 /* Mount a partition which is read-only, read-write */
1299                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1300                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1301                 s->s_flags &= ~MS_RDONLY;
1302                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1303                 if (!old_format_only(s))
1304                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1305                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1306                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1307                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1308         }
1309         /* this will force a full flush of all journal lists */
1310         SB_JOURNAL(s)->j_must_wait = 1;
1311         err = journal_end(&th, s, 10);
1312         if (err)
1313                 goto out_err;
1314         s->s_dirt = 0;
1315
1316         if (!(*mount_flags & MS_RDONLY)) {
1317                 finish_unfinished(s);
1318                 reiserfs_xattr_init(s, *mount_flags);
1319         }
1320
1321 out_ok:
1322         replace_mount_options(s, new_opts);
1323         unlock_kernel();
1324         return 0;
1325
1326 out_err:
1327         kfree(new_opts);
1328         unlock_kernel();
1329         return err;
1330 }
1331
1332 static int read_super_block(struct super_block *s, int offset)
1333 {
1334         struct buffer_head *bh;
1335         struct reiserfs_super_block *rs;
1336         int fs_blocksize;
1337
1338         bh = sb_bread(s, offset / s->s_blocksize);
1339         if (!bh) {
1340                 reiserfs_warning(s, "sh-2006",
1341                                  "bread failed (dev %s, block %lu, size %lu)",
1342                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1343                                  s->s_blocksize);
1344                 return 1;
1345         }
1346
1347         rs = (struct reiserfs_super_block *)bh->b_data;
1348         if (!is_any_reiserfs_magic_string(rs)) {
1349                 brelse(bh);
1350                 return 1;
1351         }
1352         //
1353         // ok, reiserfs signature (old or new) found in at the given offset
1354         //
1355         fs_blocksize = sb_blocksize(rs);
1356         brelse(bh);
1357         sb_set_blocksize(s, fs_blocksize);
1358
1359         bh = sb_bread(s, offset / s->s_blocksize);
1360         if (!bh) {
1361                 reiserfs_warning(s, "sh-2007",
1362                                  "bread failed (dev %s, block %lu, size %lu)",
1363                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1364                                  s->s_blocksize);
1365                 return 1;
1366         }
1367
1368         rs = (struct reiserfs_super_block *)bh->b_data;
1369         if (sb_blocksize(rs) != s->s_blocksize) {
1370                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1371                                  "filesystem on (dev %s, block %Lu, size %lu)",
1372                                  reiserfs_bdevname(s),
1373                                  (unsigned long long)bh->b_blocknr,
1374                                  s->s_blocksize);
1375                 brelse(bh);
1376                 return 1;
1377         }
1378
1379         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1380                 brelse(bh);
1381                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1382                                  "--rebuild-tree run detected. Please run\n"
1383                                  "reiserfsck --rebuild-tree and wait for a "
1384                                  "completion. If that fails\n"
1385                                  "get newer reiserfsprogs package");
1386                 return 1;
1387         }
1388
1389         SB_BUFFER_WITH_SB(s) = bh;
1390         SB_DISK_SUPER_BLOCK(s) = rs;
1391
1392         if (is_reiserfs_jr(rs)) {
1393                 /* magic is of non-standard journal filesystem, look at s_version to
1394                    find which format is in use */
1395                 if (sb_version(rs) == REISERFS_VERSION_2)
1396                         reiserfs_info(s, "found reiserfs format \"3.6\""
1397                                       " with non-standard journal\n");
1398                 else if (sb_version(rs) == REISERFS_VERSION_1)
1399                         reiserfs_info(s, "found reiserfs format \"3.5\""
1400                                       " with non-standard journal\n");
1401                 else {
1402                         reiserfs_warning(s, "sh-2012", "found unknown "
1403                                          "format \"%u\" of reiserfs with "
1404                                          "non-standard magic", sb_version(rs));
1405                         return 1;
1406                 }
1407         } else
1408                 /* s_version of standard format may contain incorrect information,
1409                    so we just look at the magic string */
1410                 reiserfs_info(s,
1411                               "found reiserfs format \"%s\" with standard journal\n",
1412                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1413
1414         s->s_op = &reiserfs_sops;
1415         s->s_export_op = &reiserfs_export_ops;
1416 #ifdef CONFIG_QUOTA
1417         s->s_qcop = &reiserfs_qctl_operations;
1418         s->dq_op = &reiserfs_quota_operations;
1419 #endif
1420
1421         /* new format is limited by the 32 bit wide i_blocks field, want to
1422          ** be one full block below that.
1423          */
1424         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1425         return 0;
1426 }
1427
1428 /* after journal replay, reread all bitmap and super blocks */
1429 static int reread_meta_blocks(struct super_block *s)
1430 {
1431         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1432         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1433         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1434                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1435                 return 1;
1436         }
1437
1438         return 0;
1439 }
1440
1441 /////////////////////////////////////////////////////
1442 // hash detection stuff
1443
1444 // if root directory is empty - we set default - Yura's - hash and
1445 // warn about it
1446 // FIXME: we look for only one name in a directory. If tea and yura
1447 // bith have the same value - we ask user to send report to the
1448 // mailing list
1449 static __u32 find_hash_out(struct super_block *s)
1450 {
1451         int retval;
1452         struct inode *inode;
1453         struct cpu_key key;
1454         INITIALIZE_PATH(path);
1455         struct reiserfs_dir_entry de;
1456         __u32 hash = DEFAULT_HASH;
1457
1458         inode = s->s_root->d_inode;
1459
1460         do {                    // Some serious "goto"-hater was there ;)
1461                 u32 teahash, r5hash, yurahash;
1462
1463                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1464                 retval = search_by_entry_key(s, &key, &path, &de);
1465                 if (retval == IO_ERROR) {
1466                         pathrelse(&path);
1467                         return UNSET_HASH;
1468                 }
1469                 if (retval == NAME_NOT_FOUND)
1470                         de.de_entry_num--;
1471                 set_de_name_and_namelen(&de);
1472                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1473                         /* allow override in this case */
1474                         if (reiserfs_rupasov_hash(s)) {
1475                                 hash = YURA_HASH;
1476                         }
1477                         reiserfs_info(s, "FS seems to be empty, autodetect "
1478                                          "is using the default hash\n");
1479                         break;
1480                 }
1481                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1482                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1483                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1484                 if (((teahash == r5hash)
1485                      &&
1486                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1487                       == r5hash)) || ((teahash == yurahash)
1488                                       && (yurahash ==
1489                                           GET_HASH_VALUE(deh_offset
1490                                                          (&
1491                                                           (de.
1492                                                            de_deh[de.
1493                                                                   de_entry_num])))))
1494                     || ((r5hash == yurahash)
1495                         && (yurahash ==
1496                             GET_HASH_VALUE(deh_offset
1497                                            (&(de.de_deh[de.de_entry_num])))))) {
1498                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1499                                          "automatically detect hash function. "
1500                                          "Please mount with -o "
1501                                          "hash={tea,rupasov,r5}");
1502                         hash = UNSET_HASH;
1503                         break;
1504                 }
1505                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1506                     yurahash)
1507                         hash = YURA_HASH;
1508                 else if (GET_HASH_VALUE
1509                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1510                         hash = TEA_HASH;
1511                 else if (GET_HASH_VALUE
1512                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1513                         hash = R5_HASH;
1514                 else {
1515                         reiserfs_warning(s, "reiserfs-2506",
1516                                          "Unrecognised hash function");
1517                         hash = UNSET_HASH;
1518                 }
1519         } while (0);
1520
1521         pathrelse(&path);
1522         return hash;
1523 }
1524
1525 // finds out which hash names are sorted with
1526 static int what_hash(struct super_block *s)
1527 {
1528         __u32 code;
1529
1530         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1531
1532         /* reiserfs_hash_detect() == true if any of the hash mount options
1533          ** were used.  We must check them to make sure the user isn't
1534          ** using a bad hash value
1535          */
1536         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1537                 code = find_hash_out(s);
1538
1539         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1540                 /* detection has found the hash, and we must check against the
1541                  ** mount options
1542                  */
1543                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1544                         reiserfs_warning(s, "reiserfs-2507",
1545                                          "Error, %s hash detected, "
1546                                          "unable to force rupasov hash",
1547                                          reiserfs_hashname(code));
1548                         code = UNSET_HASH;
1549                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1550                         reiserfs_warning(s, "reiserfs-2508",
1551                                          "Error, %s hash detected, "
1552                                          "unable to force tea hash",
1553                                          reiserfs_hashname(code));
1554                         code = UNSET_HASH;
1555                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1556                         reiserfs_warning(s, "reiserfs-2509",
1557                                          "Error, %s hash detected, "
1558                                          "unable to force r5 hash",
1559                                          reiserfs_hashname(code));
1560                         code = UNSET_HASH;
1561                 }
1562         } else {
1563                 /* find_hash_out was not called or could not determine the hash */
1564                 if (reiserfs_rupasov_hash(s)) {
1565                         code = YURA_HASH;
1566                 } else if (reiserfs_tea_hash(s)) {
1567                         code = TEA_HASH;
1568                 } else if (reiserfs_r5_hash(s)) {
1569                         code = R5_HASH;
1570                 }
1571         }
1572
1573         /* if we are mounted RW, and we have a new valid hash code, update
1574          ** the super
1575          */
1576         if (code != UNSET_HASH &&
1577             !(s->s_flags & MS_RDONLY) &&
1578             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1579                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1580         }
1581         return code;
1582 }
1583
1584 // return pointer to appropriate function
1585 static hashf_t hash_function(struct super_block *s)
1586 {
1587         switch (what_hash(s)) {
1588         case TEA_HASH:
1589                 reiserfs_info(s, "Using tea hash to sort names\n");
1590                 return keyed_hash;
1591         case YURA_HASH:
1592                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1593                 return yura_hash;
1594         case R5_HASH:
1595                 reiserfs_info(s, "Using r5 hash to sort names\n");
1596                 return r5_hash;
1597         }
1598         return NULL;
1599 }
1600
1601 // this is used to set up correct value for old partitions
1602 static int function2code(hashf_t func)
1603 {
1604         if (func == keyed_hash)
1605                 return TEA_HASH;
1606         if (func == yura_hash)
1607                 return YURA_HASH;
1608         if (func == r5_hash)
1609                 return R5_HASH;
1610
1611         BUG();                  // should never happen
1612
1613         return 0;
1614 }
1615
1616 #define SWARN(silent, s, id, ...)                       \
1617         if (!(silent))                          \
1618                 reiserfs_warning(s, id, __VA_ARGS__)
1619
1620 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1621 {
1622         struct inode *root_inode;
1623         struct reiserfs_transaction_handle th;
1624         int old_format = 0;
1625         unsigned long blocks;
1626         unsigned int commit_max_age = 0;
1627         int jinit_done = 0;
1628         struct reiserfs_iget_args args;
1629         struct reiserfs_super_block *rs;
1630         char *jdev_name;
1631         struct reiserfs_sb_info *sbi;
1632         int errval = -EINVAL;
1633         char *qf_names[MAXQUOTAS] = {};
1634         unsigned int qfmt = 0;
1635
1636         save_mount_options(s, data);
1637
1638         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1639         if (!sbi) {
1640                 errval = -ENOMEM;
1641                 goto error;
1642         }
1643         s->s_fs_info = sbi;
1644         /* Set default values for options: non-aggressive tails, RO on errors */
1645         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1646         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1647         /* no preallocation minimum, be smart in
1648            reiserfs_file_write instead */
1649         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1650         /* Preallocate by 16 blocks (17-1) at once */
1651         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1652         /* setup default block allocator options */
1653         reiserfs_init_alloc_options(s);
1654
1655         jdev_name = NULL;
1656         if (reiserfs_parse_options
1657             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1658              &commit_max_age, qf_names, &qfmt) == 0) {
1659                 goto error;
1660         }
1661 #ifdef CONFIG_QUOTA
1662         handle_quota_files(s, qf_names, &qfmt);
1663 #endif
1664
1665         if (blocks) {
1666                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1667                 goto error;
1668         }
1669
1670         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1671         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1672                 old_format = 1;
1673         /* try new format (64-th 1k block), which can contain reiserfs super block */
1674         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1675                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1676                       reiserfs_bdevname(s));
1677                 goto error;
1678         }
1679
1680         rs = SB_DISK_SUPER_BLOCK(s);
1681         /* Let's do basic sanity check to verify that underlying device is not
1682            smaller than the filesystem. If the check fails then abort and scream,
1683            because bad stuff will happen otherwise. */
1684         if (s->s_bdev && s->s_bdev->bd_inode
1685             && i_size_read(s->s_bdev->bd_inode) <
1686             sb_block_count(rs) * sb_blocksize(rs)) {
1687                 SWARN(silent, s, "", "Filesystem cannot be "
1688                       "mounted because it is bigger than the device");
1689                 SWARN(silent, s, "", "You may need to run fsck "
1690                       "or increase size of your LVM partition");
1691                 SWARN(silent, s, "", "Or may be you forgot to "
1692                       "reboot after fdisk when it told you to");
1693                 goto error;
1694         }
1695
1696         sbi->s_mount_state = SB_REISERFS_STATE(s);
1697         sbi->s_mount_state = REISERFS_VALID_FS;
1698
1699         if ((errval = reiserfs_init_bitmap_cache(s))) {
1700                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1701                 goto error;
1702         }
1703         errval = -EINVAL;
1704 #ifdef CONFIG_REISERFS_CHECK
1705         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1706         SWARN(silent, s, "", "- it is slow mode for debugging.");
1707 #endif
1708
1709         /* make data=ordered the default */
1710         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1711             !reiserfs_data_writeback(s)) {
1712                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1713         }
1714
1715         if (reiserfs_data_log(s)) {
1716                 reiserfs_info(s, "using journaled data mode\n");
1717         } else if (reiserfs_data_ordered(s)) {
1718                 reiserfs_info(s, "using ordered data mode\n");
1719         } else {
1720                 reiserfs_info(s, "using writeback data mode\n");
1721         }
1722         if (reiserfs_barrier_flush(s)) {
1723                 printk("reiserfs: using flush barriers\n");
1724         }
1725         // set_device_ro(s->s_dev, 1) ;
1726         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1727                 SWARN(silent, s, "sh-2022",
1728                       "unable to initialize journal space");
1729                 goto error;
1730         } else {
1731                 jinit_done = 1; /* once this is set, journal_release must be called
1732                                  ** if we error out of the mount
1733                                  */
1734         }
1735         if (reread_meta_blocks(s)) {
1736                 SWARN(silent, s, "jmacd-9",
1737                       "unable to reread meta blocks after journal init");
1738                 goto error;
1739         }
1740
1741         if (replay_only(s))
1742                 goto error;
1743
1744         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1745                 SWARN(silent, s, "clm-7000",
1746                       "Detected readonly device, marking FS readonly");
1747                 s->s_flags |= MS_RDONLY;
1748         }
1749         args.objectid = REISERFS_ROOT_OBJECTID;
1750         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1751         root_inode =
1752             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1753                          reiserfs_init_locked_inode, (void *)(&args));
1754         if (!root_inode) {
1755                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1756                 goto error;
1757         }
1758
1759         if (root_inode->i_state & I_NEW) {
1760                 reiserfs_read_locked_inode(root_inode, &args);
1761                 unlock_new_inode(root_inode);
1762         }
1763
1764         s->s_root = d_alloc_root(root_inode);
1765         if (!s->s_root) {
1766                 iput(root_inode);
1767                 goto error;
1768         }
1769         // define and initialize hash function
1770         sbi->s_hash_function = hash_function(s);
1771         if (sbi->s_hash_function == NULL) {
1772                 dput(s->s_root);
1773                 s->s_root = NULL;
1774                 goto error;
1775         }
1776
1777         if (is_reiserfs_3_5(rs)
1778             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1779                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1780         else if (old_format)
1781                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1782         else
1783                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1784
1785         if (!(s->s_flags & MS_RDONLY)) {
1786
1787                 errval = journal_begin(&th, s, 1);
1788                 if (errval) {
1789                         dput(s->s_root);
1790                         s->s_root = NULL;
1791                         goto error;
1792                 }
1793                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1794
1795                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1796                 set_sb_fs_state(rs, 0);
1797
1798                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1799                  * case, but older revisions can't. This will cause the
1800                  * file system to fail mount on those older implementations,
1801                  * avoiding corruption. -jeffm */
1802                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1803                     sb_bmap_nr(rs) != 0) {
1804                         reiserfs_warning(s, "super-2030", "This file system "
1805                                         "claims to use %u bitmap blocks in "
1806                                         "its super block, but requires %u. "
1807                                         "Clearing to zero.", sb_bmap_nr(rs),
1808                                         reiserfs_bmap_count(s));
1809
1810                         set_sb_bmap_nr(rs, 0);
1811                 }
1812
1813                 if (old_format_only(s)) {
1814                         /* filesystem of format 3.5 either with standard or non-standard
1815                            journal */
1816                         if (convert_reiserfs(s)) {
1817                                 /* and -o conv is given */
1818                                 if (!silent)
1819                                         reiserfs_info(s,
1820                                                       "converting 3.5 filesystem to the 3.6 format");
1821
1822                                 if (is_reiserfs_3_5(rs))
1823                                         /* put magic string of 3.6 format. 2.2 will not be able to
1824                                            mount this filesystem anymore */
1825                                         memcpy(rs->s_v1.s_magic,
1826                                                reiserfs_3_6_magic_string,
1827                                                sizeof
1828                                                (reiserfs_3_6_magic_string));
1829
1830                                 set_sb_version(rs, REISERFS_VERSION_2);
1831                                 reiserfs_convert_objectid_map_v1(s);
1832                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1833                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1834                         } else if (!silent) {
1835                                 reiserfs_info(s, "using 3.5.x disk format\n");
1836                         }
1837                 } else
1838                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1839
1840
1841                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1842                 errval = journal_end(&th, s, 1);
1843                 if (errval) {
1844                         dput(s->s_root);
1845                         s->s_root = NULL;
1846                         goto error;
1847                 }
1848
1849                 if ((errval = reiserfs_lookup_privroot(s)) ||
1850                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1851                         dput(s->s_root);
1852                         s->s_root = NULL;
1853                         goto error;
1854                 }
1855
1856                 /* look for files which were to be removed in previous session */
1857                 finish_unfinished(s);
1858         } else {
1859                 if (old_format_only(s) && !silent) {
1860                         reiserfs_info(s, "using 3.5.x disk format\n");
1861                 }
1862
1863                 if ((errval = reiserfs_lookup_privroot(s)) ||
1864                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1865                         dput(s->s_root);
1866                         s->s_root = NULL;
1867                         goto error;
1868                 }
1869         }
1870         // mark hash in super block: it could be unset. overwrite should be ok
1871         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1872
1873         handle_attrs(s);
1874
1875         reiserfs_proc_info_init(s);
1876
1877         init_waitqueue_head(&(sbi->s_wait));
1878         spin_lock_init(&sbi->bitmap_lock);
1879
1880         return (0);
1881
1882 error:
1883         if (jinit_done) {       /* kill the commit thread, free journal ram */
1884                 journal_release_error(NULL, s);
1885         }
1886
1887         reiserfs_free_bitmap_cache(s);
1888         if (SB_BUFFER_WITH_SB(s))
1889                 brelse(SB_BUFFER_WITH_SB(s));
1890 #ifdef CONFIG_QUOTA
1891         {
1892                 int j;
1893                 for (j = 0; j < MAXQUOTAS; j++)
1894                         kfree(qf_names[j]);
1895         }
1896 #endif
1897         kfree(sbi);
1898
1899         s->s_fs_info = NULL;
1900         return errval;
1901 }
1902
1903 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1904 {
1905         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1906
1907         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1908         buf->f_bfree = sb_free_blocks(rs);
1909         buf->f_bavail = buf->f_bfree;
1910         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1911         buf->f_bsize = dentry->d_sb->s_blocksize;
1912         /* changed to accommodate gcc folks. */
1913         buf->f_type = REISERFS_SUPER_MAGIC;
1914         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1915         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1916                                 sizeof(rs->s_uuid)/2);
1917
1918         return 0;
1919 }
1920
1921 #ifdef CONFIG_QUOTA
1922 static int reiserfs_write_dquot(struct dquot *dquot)
1923 {
1924         struct reiserfs_transaction_handle th;
1925         int ret, err;
1926
1927         reiserfs_write_lock(dquot->dq_sb);
1928         ret =
1929             journal_begin(&th, dquot->dq_sb,
1930                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1931         if (ret)
1932                 goto out;
1933         ret = dquot_commit(dquot);
1934         err =
1935             journal_end(&th, dquot->dq_sb,
1936                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1937         if (!ret && err)
1938                 ret = err;
1939       out:
1940         reiserfs_write_unlock(dquot->dq_sb);
1941         return ret;
1942 }
1943
1944 static int reiserfs_acquire_dquot(struct dquot *dquot)
1945 {
1946         struct reiserfs_transaction_handle th;
1947         int ret, err;
1948
1949         reiserfs_write_lock(dquot->dq_sb);
1950         ret =
1951             journal_begin(&th, dquot->dq_sb,
1952                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1953         if (ret)
1954                 goto out;
1955         ret = dquot_acquire(dquot);
1956         err =
1957             journal_end(&th, dquot->dq_sb,
1958                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1959         if (!ret && err)
1960                 ret = err;
1961       out:
1962         reiserfs_write_unlock(dquot->dq_sb);
1963         return ret;
1964 }
1965
1966 static int reiserfs_release_dquot(struct dquot *dquot)
1967 {
1968         struct reiserfs_transaction_handle th;
1969         int ret, err;
1970
1971         reiserfs_write_lock(dquot->dq_sb);
1972         ret =
1973             journal_begin(&th, dquot->dq_sb,
1974                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1975         if (ret) {
1976                 /* Release dquot anyway to avoid endless cycle in dqput() */
1977                 dquot_release(dquot);
1978                 goto out;
1979         }
1980         ret = dquot_release(dquot);
1981         err =
1982             journal_end(&th, dquot->dq_sb,
1983                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1984         if (!ret && err)
1985                 ret = err;
1986       out:
1987         reiserfs_write_unlock(dquot->dq_sb);
1988         return ret;
1989 }
1990
1991 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1992 {
1993         /* Are we journaling quotas? */
1994         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1995             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1996                 dquot_mark_dquot_dirty(dquot);
1997                 return reiserfs_write_dquot(dquot);
1998         } else
1999                 return dquot_mark_dquot_dirty(dquot);
2000 }
2001
2002 static int reiserfs_write_info(struct super_block *sb, int type)
2003 {
2004         struct reiserfs_transaction_handle th;
2005         int ret, err;
2006
2007         /* Data block + inode block */
2008         reiserfs_write_lock(sb);
2009         ret = journal_begin(&th, sb, 2);
2010         if (ret)
2011                 goto out;
2012         ret = dquot_commit_info(sb, type);
2013         err = journal_end(&th, sb, 2);
2014         if (!ret && err)
2015                 ret = err;
2016       out:
2017         reiserfs_write_unlock(sb);
2018         return ret;
2019 }
2020
2021 /*
2022  * Turn on quotas during mount time - we need to find the quota file and such...
2023  */
2024 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2025 {
2026         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2027                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2028 }
2029
2030 /*
2031  * Standard function to be called on quota_on
2032  */
2033 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2034                              char *name, int remount)
2035 {
2036         int err;
2037         struct path path;
2038         struct inode *inode;
2039         struct reiserfs_transaction_handle th;
2040
2041         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2042                 return -EINVAL;
2043         /* No more checks needed? Path and format_id are bogus anyway... */
2044         if (remount)
2045                 return vfs_quota_on(sb, type, format_id, name, 1);
2046         err = kern_path(name, LOOKUP_FOLLOW, &path);
2047         if (err)
2048                 return err;
2049         /* Quotafile not on the same filesystem? */
2050         if (path.mnt->mnt_sb != sb) {
2051                 err = -EXDEV;
2052                 goto out;
2053         }
2054         inode = path.dentry->d_inode;
2055         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2056         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2057                 err = reiserfs_unpack(inode, NULL);
2058                 if (err) {
2059                         reiserfs_warning(sb, "super-6520",
2060                                 "Unpacking tail of quota file failed"
2061                                 " (%d). Cannot turn on quotas.", err);
2062                         err = -EINVAL;
2063                         goto out;
2064                 }
2065                 mark_inode_dirty(inode);
2066         }
2067         /* Journaling quota? */
2068         if (REISERFS_SB(sb)->s_qf_names[type]) {
2069                 /* Quotafile not of fs root? */
2070                 if (path.dentry->d_parent != sb->s_root)
2071                         reiserfs_warning(sb, "super-6521",
2072                                  "Quota file not on filesystem root. "
2073                                  "Journalled quota will not work.");
2074         }
2075
2076         /*
2077          * When we journal data on quota file, we have to flush journal to see
2078          * all updates to the file when we bypass pagecache...
2079          */
2080         if (reiserfs_file_data_log(inode)) {
2081                 /* Just start temporary transaction and finish it */
2082                 err = journal_begin(&th, sb, 1);
2083                 if (err)
2084                         goto out;
2085                 err = journal_end_sync(&th, sb, 1);
2086                 if (err)
2087                         goto out;
2088         }
2089         err = vfs_quota_on_path(sb, type, format_id, &path);
2090 out:
2091         path_put(&path);
2092         return err;
2093 }
2094
2095 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2096  * acquiring the locks... As quota files are never truncated and quota code
2097  * itself serializes the operations (and noone else should touch the files)
2098  * we don't have to be afraid of races */
2099 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2100                                    size_t len, loff_t off)
2101 {
2102         struct inode *inode = sb_dqopt(sb)->files[type];
2103         unsigned long blk = off >> sb->s_blocksize_bits;
2104         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2105         size_t toread;
2106         struct buffer_head tmp_bh, *bh;
2107         loff_t i_size = i_size_read(inode);
2108
2109         if (off > i_size)
2110                 return 0;
2111         if (off + len > i_size)
2112                 len = i_size - off;
2113         toread = len;
2114         while (toread > 0) {
2115                 tocopy =
2116                     sb->s_blocksize - offset <
2117                     toread ? sb->s_blocksize - offset : toread;
2118                 tmp_bh.b_state = 0;
2119                 /* Quota files are without tails so we can safely use this function */
2120                 reiserfs_write_lock(sb);
2121                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2122                 reiserfs_write_unlock(sb);
2123                 if (err)
2124                         return err;
2125                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2126                         memset(data, 0, tocopy);
2127                 else {
2128                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2129                         if (!bh)
2130                                 return -EIO;
2131                         memcpy(data, bh->b_data + offset, tocopy);
2132                         brelse(bh);
2133                 }
2134                 offset = 0;
2135                 toread -= tocopy;
2136                 data += tocopy;
2137                 blk++;
2138         }
2139         return len;
2140 }
2141
2142 /* Write to quotafile (we know the transaction is already started and has
2143  * enough credits) */
2144 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2145                                     const char *data, size_t len, loff_t off)
2146 {
2147         struct inode *inode = sb_dqopt(sb)->files[type];
2148         unsigned long blk = off >> sb->s_blocksize_bits;
2149         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2150         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2151         size_t towrite = len;
2152         struct buffer_head tmp_bh, *bh;
2153
2154         if (!current->journal_info) {
2155                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2156                         " cancelled because transaction is not started.\n",
2157                         (unsigned long long)off, (unsigned long long)len);
2158                 return -EIO;
2159         }
2160         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2161         while (towrite > 0) {
2162                 tocopy = sb->s_blocksize - offset < towrite ?
2163                     sb->s_blocksize - offset : towrite;
2164                 tmp_bh.b_state = 0;
2165                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2166                 if (err)
2167                         goto out;
2168                 if (offset || tocopy != sb->s_blocksize)
2169                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2170                 else
2171                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2172                 if (!bh) {
2173                         err = -EIO;
2174                         goto out;
2175                 }
2176                 lock_buffer(bh);
2177                 memcpy(bh->b_data + offset, data, tocopy);
2178                 flush_dcache_page(bh->b_page);
2179                 set_buffer_uptodate(bh);
2180                 unlock_buffer(bh);
2181                 reiserfs_prepare_for_journal(sb, bh, 1);
2182                 journal_mark_dirty(current->journal_info, sb, bh);
2183                 if (!journal_quota)
2184                         reiserfs_add_ordered_list(inode, bh);
2185                 brelse(bh);
2186                 offset = 0;
2187                 towrite -= tocopy;
2188                 data += tocopy;
2189                 blk++;
2190         }
2191 out:
2192         if (len == towrite) {
2193                 mutex_unlock(&inode->i_mutex);
2194                 return err;
2195         }
2196         if (inode->i_size < off + len - towrite)
2197                 i_size_write(inode, off + len - towrite);
2198         inode->i_version++;
2199         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2200         mark_inode_dirty(inode);
2201         mutex_unlock(&inode->i_mutex);
2202         return len - towrite;
2203 }
2204
2205 #endif
2206
2207 static int get_super_block(struct file_system_type *fs_type,
2208                            int flags, const char *dev_name,
2209                            void *data, struct vfsmount *mnt)
2210 {
2211         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2212                            mnt);
2213 }
2214
2215 static int __init init_reiserfs_fs(void)
2216 {
2217         int ret;
2218
2219         if ((ret = init_inodecache())) {
2220                 return ret;
2221         }
2222
2223         reiserfs_proc_info_global_init();
2224         reiserfs_proc_register_global("version",
2225                                       reiserfs_global_version_in_proc);
2226
2227         ret = register_filesystem(&reiserfs_fs_type);
2228
2229         if (ret == 0) {
2230                 return 0;
2231         }
2232
2233         reiserfs_proc_unregister_global("version");
2234         reiserfs_proc_info_global_done();
2235         destroy_inodecache();
2236
2237         return ret;
2238 }
2239
2240 static void __exit exit_reiserfs_fs(void)
2241 {
2242         reiserfs_proc_unregister_global("version");
2243         reiserfs_proc_info_global_done();
2244         unregister_filesystem(&reiserfs_fs_type);
2245         destroy_inodecache();
2246 }
2247
2248 struct file_system_type reiserfs_fs_type = {
2249         .owner = THIS_MODULE,
2250         .name = "reiserfs",
2251         .get_sb = get_super_block,
2252         .kill_sb = reiserfs_kill_sb,
2253         .fs_flags = FS_REQUIRES_DEV,
2254 };
2255
2256 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2257 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2258 MODULE_LICENSE("GPL");
2259
2260 module_init(init_reiserfs_fs);
2261 module_exit(exit_reiserfs_fs);