quota: move remount handling into the filesystem
[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/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
19 #include <linux/reiserfs_fs.h>
20 #include <linux/reiserfs_acl.h>
21 #include <linux/reiserfs_xattr.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.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                 dquot_initialize(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         reiserfs_write_lock(s);
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         reiserfs_write_unlock(s);
504         mutex_destroy(&REISERFS_SB(s)->lock);
505         kfree(s->s_fs_info);
506         s->s_fs_info = NULL;
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 }
533
534 static int init_inodecache(void)
535 {
536         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
537                                                   sizeof(struct
538                                                          reiserfs_inode_info),
539                                                   0, (SLAB_RECLAIM_ACCOUNT|
540                                                         SLAB_MEM_SPREAD),
541                                                   init_once);
542         if (reiserfs_inode_cachep == NULL)
543                 return -ENOMEM;
544         return 0;
545 }
546
547 static void destroy_inodecache(void)
548 {
549         kmem_cache_destroy(reiserfs_inode_cachep);
550 }
551
552 /* we don't mark inodes dirty, we just log them */
553 static void reiserfs_dirty_inode(struct inode *inode)
554 {
555         struct reiserfs_transaction_handle th;
556
557         int err = 0;
558         int lock_depth;
559
560         if (inode->i_sb->s_flags & MS_RDONLY) {
561                 reiserfs_warning(inode->i_sb, "clm-6006",
562                                  "writing inode %lu on readonly FS",
563                                  inode->i_ino);
564                 return;
565         }
566         lock_depth = reiserfs_write_lock_once(inode->i_sb);
567
568         /* this is really only used for atime updates, so they don't have
569          ** to be included in O_SYNC or fsync
570          */
571         err = journal_begin(&th, inode->i_sb, 1);
572         if (err)
573                 goto out;
574
575         reiserfs_update_sd(&th, inode);
576         journal_end(&th, inode->i_sb, 1);
577
578 out:
579         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
580 }
581
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584         dquot_drop(inode);
585 }
586
587 #ifdef CONFIG_QUOTA
588 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
589                                     size_t, loff_t);
590 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
591                                    loff_t);
592 #endif
593
594 static const struct super_operations reiserfs_sops = {
595         .alloc_inode = reiserfs_alloc_inode,
596         .destroy_inode = reiserfs_destroy_inode,
597         .write_inode = reiserfs_write_inode,
598         .dirty_inode = reiserfs_dirty_inode,
599         .clear_inode = reiserfs_clear_inode,
600         .delete_inode = reiserfs_delete_inode,
601         .put_super = reiserfs_put_super,
602         .write_super = reiserfs_write_super,
603         .sync_fs = reiserfs_sync_fs,
604         .freeze_fs = reiserfs_freeze,
605         .unfreeze_fs = reiserfs_unfreeze,
606         .statfs = reiserfs_statfs,
607         .remount_fs = reiserfs_remount,
608         .show_options = generic_show_options,
609 #ifdef CONFIG_QUOTA
610         .quota_read = reiserfs_quota_read,
611         .quota_write = reiserfs_quota_write,
612 #endif
613 };
614
615 #ifdef CONFIG_QUOTA
616 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
617
618 static int reiserfs_write_dquot(struct dquot *);
619 static int reiserfs_acquire_dquot(struct dquot *);
620 static int reiserfs_release_dquot(struct dquot *);
621 static int reiserfs_mark_dquot_dirty(struct dquot *);
622 static int reiserfs_write_info(struct super_block *, int);
623 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
624
625 static const struct dquot_operations reiserfs_quota_operations = {
626         .write_dquot = reiserfs_write_dquot,
627         .acquire_dquot = reiserfs_acquire_dquot,
628         .release_dquot = reiserfs_release_dquot,
629         .mark_dirty = reiserfs_mark_dquot_dirty,
630         .write_info = reiserfs_write_info,
631         .alloc_dquot    = dquot_alloc,
632         .destroy_dquot  = dquot_destroy,
633 };
634
635 static const struct quotactl_ops reiserfs_qctl_operations = {
636         .quota_on = reiserfs_quota_on,
637         .quota_off = vfs_quota_off,
638         .quota_sync = vfs_quota_sync,
639         .get_info = vfs_get_dqinfo,
640         .set_info = vfs_set_dqinfo,
641         .get_dqblk = vfs_get_dqblk,
642         .set_dqblk = vfs_set_dqblk,
643 };
644 #endif
645
646 static const struct export_operations reiserfs_export_ops = {
647         .encode_fh = reiserfs_encode_fh,
648         .fh_to_dentry = reiserfs_fh_to_dentry,
649         .fh_to_parent = reiserfs_fh_to_parent,
650         .get_parent = reiserfs_get_parent,
651 };
652
653 /* this struct is used in reiserfs_getopt () for containing the value for those
654    mount options that have values rather than being toggles. */
655 typedef struct {
656         char *value;
657         int setmask;            /* bitmask which is to set on mount_options bitmask when this
658                                    value is found, 0 is no bits are to be changed. */
659         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
660                                    value is found, 0 is no bits are to be changed. This is
661                                    applied BEFORE setmask */
662 } arg_desc_t;
663
664 /* Set this bit in arg_required to allow empty arguments */
665 #define REISERFS_OPT_ALLOWEMPTY 31
666
667 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
668    mount options */
669 typedef struct {
670         char *option_name;
671         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
672         const arg_desc_t *values;       /* list of values accepted by an option */
673         int setmask;            /* bitmask which is to set on mount_options bitmask when this
674                                    value is found, 0 is no bits are to be changed. */
675         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
676                                    value is found, 0 is no bits are to be changed. This is
677                                    applied BEFORE setmask */
678 } opt_desc_t;
679
680 /* possible values for -o data= */
681 static const arg_desc_t logging_mode[] = {
682         {"ordered", 1 << REISERFS_DATA_ORDERED,
683          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
684         {"journal", 1 << REISERFS_DATA_LOG,
685          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
686         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
687          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
688         {.value = NULL}
689 };
690
691 /* possible values for -o barrier= */
692 static const arg_desc_t barrier_mode[] = {
693         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
694         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
695         {.value = NULL}
696 };
697
698 /* possible values for "-o block-allocator=" and bits which are to be set in
699    s_mount_opt of reiserfs specific part of in-core super block */
700 static const arg_desc_t balloc[] = {
701         {"noborder", 1 << REISERFS_NO_BORDER, 0},
702         {"border", 0, 1 << REISERFS_NO_BORDER},
703         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
704         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
705         {"test4", 1 << REISERFS_TEST4, 0},
706         {"notest4", 0, 1 << REISERFS_TEST4},
707         {NULL, 0, 0}
708 };
709
710 static const arg_desc_t tails[] = {
711         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
712         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
713         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
714         {NULL, 0, 0}
715 };
716
717 static const arg_desc_t error_actions[] = {
718         {"panic", 1 << REISERFS_ERROR_PANIC,
719          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
720         {"ro-remount", 1 << REISERFS_ERROR_RO,
721          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
722 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
723         {"continue", 1 << REISERFS_ERROR_CONTINUE,
724          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
725 #endif
726         {NULL, 0, 0},
727 };
728
729 /* proceed only one option from a list *cur - string containing of mount options
730    opts - array of options which are accepted
731    opt_arg - if option is found and requires an argument and if it is specifed
732    in the input - pointer to the argument is stored here
733    bit_flags - if option requires to set a certain bit - it is set here
734    return -1 if unknown option is found, opt->arg_required otherwise */
735 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
736                            char **opt_arg, unsigned long *bit_flags)
737 {
738         char *p;
739         /* foo=bar,
740            ^   ^  ^
741            |   |  +-- option_end
742            |   +-- arg_start
743            +-- option_start
744          */
745         const opt_desc_t *opt;
746         const arg_desc_t *arg;
747
748         p = *cur;
749
750         /* assume argument cannot contain commas */
751         *cur = strchr(p, ',');
752         if (*cur) {
753                 *(*cur) = '\0';
754                 (*cur)++;
755         }
756
757         if (!strncmp(p, "alloc=", 6)) {
758                 /* Ugly special case, probably we should redo options parser so that
759                    it can understand several arguments for some options, also so that
760                    it can fill several bitfields with option values. */
761                 if (reiserfs_parse_alloc_options(s, p + 6)) {
762                         return -1;
763                 } else {
764                         return 0;
765                 }
766         }
767
768         /* for every option in the list */
769         for (opt = opts; opt->option_name; opt++) {
770                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
771                         if (bit_flags) {
772                                 if (opt->clrmask ==
773                                     (1 << REISERFS_UNSUPPORTED_OPT))
774                                         reiserfs_warning(s, "super-6500",
775                                                          "%s not supported.\n",
776                                                          p);
777                                 else
778                                         *bit_flags &= ~opt->clrmask;
779                                 if (opt->setmask ==
780                                     (1 << REISERFS_UNSUPPORTED_OPT))
781                                         reiserfs_warning(s, "super-6501",
782                                                          "%s not supported.\n",
783                                                          p);
784                                 else
785                                         *bit_flags |= opt->setmask;
786                         }
787                         break;
788                 }
789         }
790         if (!opt->option_name) {
791                 reiserfs_warning(s, "super-6502",
792                                  "unknown mount option \"%s\"", p);
793                 return -1;
794         }
795
796         p += strlen(opt->option_name);
797         switch (*p) {
798         case '=':
799                 if (!opt->arg_required) {
800                         reiserfs_warning(s, "super-6503",
801                                          "the option \"%s\" does not "
802                                          "require an argument\n",
803                                          opt->option_name);
804                         return -1;
805                 }
806                 break;
807
808         case 0:
809                 if (opt->arg_required) {
810                         reiserfs_warning(s, "super-6504",
811                                          "the option \"%s\" requires an "
812                                          "argument\n", opt->option_name);
813                         return -1;
814                 }
815                 break;
816         default:
817                 reiserfs_warning(s, "super-6505",
818                                  "head of option \"%s\" is only correct\n",
819                                  opt->option_name);
820                 return -1;
821         }
822
823         /* move to the argument, or to next option if argument is not required */
824         p++;
825
826         if (opt->arg_required
827             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828             && !strlen(p)) {
829                 /* this catches "option=," if not allowed */
830                 reiserfs_warning(s, "super-6506",
831                                  "empty argument for \"%s\"\n",
832                                  opt->option_name);
833                 return -1;
834         }
835
836         if (!opt->values) {
837                 /* *=NULLopt_arg contains pointer to argument */
838                 *opt_arg = p;
839                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840         }
841
842         /* values possible for this option are listed in opt->values */
843         for (arg = opt->values; arg->value; arg++) {
844                 if (!strcmp(p, arg->value)) {
845                         if (bit_flags) {
846                                 *bit_flags &= ~arg->clrmask;
847                                 *bit_flags |= arg->setmask;
848                         }
849                         return opt->arg_required;
850                 }
851         }
852
853         reiserfs_warning(s, "super-6506",
854                          "bad value \"%s\" for option \"%s\"\n", p,
855                          opt->option_name);
856         return -1;
857 }
858
859 /* returns 0 if something is wrong in option string, 1 - otherwise */
860 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
861                                   unsigned long *mount_options,
862                                   /* after the parsing phase, contains the
863                                      collection of bitflags defining what
864                                      mount options were selected. */
865                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
866                                   char **jdev_name,
867                                   unsigned int *commit_max_age,
868                                   char **qf_names,
869                                   unsigned int *qfmt)
870 {
871         int c;
872         char *arg = NULL;
873         char *pos;
874         opt_desc_t opts[] = {
875                 /* Compatibility stuff, so that -o notail for old setups still work */
876                 {"tails",.arg_required = 't',.values = tails},
877                 {"notail",.clrmask =
878                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
879                 {"conv",.setmask = 1 << REISERFS_CONVERT},
880                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
881                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
882                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
883 #ifdef CONFIG_REISERFS_FS_XATTR
884                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
885                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
886 #else
887                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
888                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
889 #endif
890 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
891                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
892                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
893 #else
894                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
895                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
896 #endif
897                 {.option_name = "nolog"},
898                 {"replayonly",.setmask = 1 << REPLAYONLY},
899                 {"block-allocator",.arg_required = 'a',.values = balloc},
900                 {"data",.arg_required = 'd',.values = logging_mode},
901                 {"barrier",.arg_required = 'b',.values = barrier_mode},
902                 {"resize",.arg_required = 'r',.values = NULL},
903                 {"jdev",.arg_required = 'j',.values = NULL},
904                 {"nolargeio",.arg_required = 'w',.values = NULL},
905                 {"commit",.arg_required = 'c',.values = NULL},
906                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
907                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
908                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
909                 {"errors",.arg_required = 'e',.values = error_actions},
910                 {"usrjquota",.arg_required =
911                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912                 {"grpjquota",.arg_required =
913                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
914                 {"jqfmt",.arg_required = 'f',.values = NULL},
915                 {.option_name = NULL}
916         };
917
918         *blocks = 0;
919         if (!options || !*options)
920                 /* use default configuration: create tails, journaling on, no
921                    conversion to newest format */
922                 return 1;
923
924         for (pos = options; pos;) {
925                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
926                 if (c == -1)
927                         /* wrong option is given */
928                         return 0;
929
930                 if (c == 'r') {
931                         char *p;
932
933                         p = NULL;
934                         /* "resize=NNN" or "resize=auto" */
935
936                         if (!strcmp(arg, "auto")) {
937                                 /* From JFS code, to auto-get the size. */
938                                 *blocks =
939                                     s->s_bdev->bd_inode->i_size >> s->
940                                     s_blocksize_bits;
941                         } else {
942                                 *blocks = simple_strtoul(arg, &p, 0);
943                                 if (*p != '\0') {
944                                         /* NNN does not look like a number */
945                                         reiserfs_warning(s, "super-6507",
946                                                          "bad value %s for "
947                                                          "-oresize\n", arg);
948                                         return 0;
949                                 }
950                         }
951                 }
952
953                 if (c == 'c') {
954                         char *p = NULL;
955                         unsigned long val = simple_strtoul(arg, &p, 0);
956                         /* commit=NNN (time in seconds) */
957                         if (*p != '\0' || val >= (unsigned int)-1) {
958                                 reiserfs_warning(s, "super-6508",
959                                                  "bad value %s for -ocommit\n",
960                                                  arg);
961                                 return 0;
962                         }
963                         *commit_max_age = (unsigned int)val;
964                 }
965
966                 if (c == 'w') {
967                         reiserfs_warning(s, "super-6509", "nolargeio option "
968                                          "is no longer supported");
969                         return 0;
970                 }
971
972                 if (c == 'j') {
973                         if (arg && *arg && jdev_name) {
974                                 if (*jdev_name) {       //Hm, already assigned?
975                                         reiserfs_warning(s, "super-6510",
976                                                          "journal device was "
977                                                          "already specified to "
978                                                          "be %s", *jdev_name);
979                                         return 0;
980                                 }
981                                 *jdev_name = arg;
982                         }
983                 }
984 #ifdef CONFIG_QUOTA
985                 if (c == 'u' || c == 'g') {
986                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
987
988                         if (sb_any_quota_loaded(s) &&
989                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
990                                 reiserfs_warning(s, "super-6511",
991                                                  "cannot change journaled "
992                                                  "quota options when quota "
993                                                  "turned on.");
994                                 return 0;
995                         }
996                         if (*arg) {     /* Some filename specified? */
997                                 if (REISERFS_SB(s)->s_qf_names[qtype]
998                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
999                                               arg)) {
1000                                         reiserfs_warning(s, "super-6512",
1001                                                          "%s quota file "
1002                                                          "already specified.",
1003                                                          QTYPE2NAME(qtype));
1004                                         return 0;
1005                                 }
1006                                 if (strchr(arg, '/')) {
1007                                         reiserfs_warning(s, "super-6513",
1008                                                          "quotafile must be "
1009                                                          "on filesystem root.");
1010                                         return 0;
1011                                 }
1012                                 qf_names[qtype] =
1013                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1014                                 if (!qf_names[qtype]) {
1015                                         reiserfs_warning(s, "reiserfs-2502",
1016                                                          "not enough memory "
1017                                                          "for storing "
1018                                                          "quotafile name.");
1019                                         return 0;
1020                                 }
1021                                 strcpy(qf_names[qtype], arg);
1022                                 *mount_options |= 1 << REISERFS_QUOTA;
1023                         } else {
1024                                 if (qf_names[qtype] !=
1025                                     REISERFS_SB(s)->s_qf_names[qtype])
1026                                         kfree(qf_names[qtype]);
1027                                 qf_names[qtype] = NULL;
1028                         }
1029                 }
1030                 if (c == 'f') {
1031                         if (!strcmp(arg, "vfsold"))
1032                                 *qfmt = QFMT_VFS_OLD;
1033                         else if (!strcmp(arg, "vfsv0"))
1034                                 *qfmt = QFMT_VFS_V0;
1035                         else {
1036                                 reiserfs_warning(s, "super-6514",
1037                                                  "unknown quota format "
1038                                                  "specified.");
1039                                 return 0;
1040                         }
1041                         if (sb_any_quota_loaded(s) &&
1042                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1043                                 reiserfs_warning(s, "super-6515",
1044                                                  "cannot change journaled "
1045                                                  "quota options when quota "
1046                                                  "turned on.");
1047                                 return 0;
1048                         }
1049                 }
1050 #else
1051                 if (c == 'u' || c == 'g' || c == 'f') {
1052                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1053                                          "quota options not supported.");
1054                         return 0;
1055                 }
1056 #endif
1057         }
1058
1059 #ifdef CONFIG_QUOTA
1060         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1061             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1062                 reiserfs_warning(s, "super-6515",
1063                                  "journaled quota format not specified.");
1064                 return 0;
1065         }
1066         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1067         if (!(*mount_options & (1 << REISERFS_QUOTA))
1068             && sb_any_quota_loaded(s)) {
1069                 reiserfs_warning(s, "super-6516", "quota options must "
1070                                  "be present when quota is turned on.");
1071                 return 0;
1072         }
1073 #endif
1074
1075         return 1;
1076 }
1077
1078 static void switch_data_mode(struct super_block *s, unsigned long mode)
1079 {
1080         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1081                                          (1 << REISERFS_DATA_ORDERED) |
1082                                          (1 << REISERFS_DATA_WRITEBACK));
1083         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1084 }
1085
1086 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1087 {
1088         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1089                 if (!reiserfs_data_log(s)) {
1090                         switch_data_mode(s, REISERFS_DATA_LOG);
1091                         reiserfs_info(s, "switching to journaled data mode\n");
1092                 }
1093         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1094                 if (!reiserfs_data_ordered(s)) {
1095                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1096                         reiserfs_info(s, "switching to ordered data mode\n");
1097                 }
1098         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1099                 if (!reiserfs_data_writeback(s)) {
1100                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1101                         reiserfs_info(s, "switching to writeback data mode\n");
1102                 }
1103         }
1104 }
1105
1106 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1107 {
1108         int flush = (1 << REISERFS_BARRIER_FLUSH);
1109         int none = (1 << REISERFS_BARRIER_NONE);
1110         int all_barrier = flush | none;
1111
1112         if (bits & all_barrier) {
1113                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1114                 if (bits & flush) {
1115                         REISERFS_SB(s)->s_mount_opt |= flush;
1116                         printk("reiserfs: enabling write barrier flush mode\n");
1117                 } else if (bits & none) {
1118                         REISERFS_SB(s)->s_mount_opt |= none;
1119                         printk("reiserfs: write barriers turned off\n");
1120                 }
1121         }
1122 }
1123
1124 static void handle_attrs(struct super_block *s)
1125 {
1126         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1127
1128         if (reiserfs_attrs(s)) {
1129                 if (old_format_only(s)) {
1130                         reiserfs_warning(s, "super-6517", "cannot support "
1131                                          "attributes on 3.5.x disk format");
1132                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1133                         return;
1134                 }
1135                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1136                         reiserfs_warning(s, "super-6518", "cannot support "
1137                                          "attributes until flag is set in "
1138                                          "super-block");
1139                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1140                 }
1141         }
1142 }
1143
1144 #ifdef CONFIG_QUOTA
1145 static void handle_quota_files(struct super_block *s, char **qf_names,
1146                                unsigned int *qfmt)
1147 {
1148         int i;
1149
1150         for (i = 0; i < MAXQUOTAS; i++) {
1151                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1152                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1153                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1154         }
1155         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1156 }
1157 #endif
1158
1159 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1160 {
1161         struct reiserfs_super_block *rs;
1162         struct reiserfs_transaction_handle th;
1163         unsigned long blocks;
1164         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1165         unsigned long safe_mask = 0;
1166         unsigned int commit_max_age = (unsigned int)-1;
1167         struct reiserfs_journal *journal = SB_JOURNAL(s);
1168         char *new_opts = kstrdup(arg, GFP_KERNEL);
1169         int err;
1170         char *qf_names[MAXQUOTAS];
1171         unsigned int qfmt = 0;
1172 #ifdef CONFIG_QUOTA
1173         int i;
1174 #endif
1175
1176         reiserfs_write_lock(s);
1177
1178 #ifdef CONFIG_QUOTA
1179         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1180 #endif
1181
1182         rs = SB_DISK_SUPER_BLOCK(s);
1183
1184         if (!reiserfs_parse_options
1185             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1186             qf_names, &qfmt)) {
1187 #ifdef CONFIG_QUOTA
1188                 for (i = 0; i < MAXQUOTAS; i++)
1189                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1190                                 kfree(qf_names[i]);
1191 #endif
1192                 err = -EINVAL;
1193                 goto out_err;
1194         }
1195 #ifdef CONFIG_QUOTA
1196         handle_quota_files(s, qf_names, &qfmt);
1197 #endif
1198
1199         handle_attrs(s);
1200
1201         /* Add options that are safe here */
1202         safe_mask |= 1 << REISERFS_SMALLTAIL;
1203         safe_mask |= 1 << REISERFS_LARGETAIL;
1204         safe_mask |= 1 << REISERFS_NO_BORDER;
1205         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1206         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1207         safe_mask |= 1 << REISERFS_TEST4;
1208         safe_mask |= 1 << REISERFS_ATTRS;
1209         safe_mask |= 1 << REISERFS_XATTRS_USER;
1210         safe_mask |= 1 << REISERFS_POSIXACL;
1211         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1212         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1213         safe_mask |= 1 << REISERFS_ERROR_RO;
1214         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1215         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1216         safe_mask |= 1 << REISERFS_QUOTA;
1217
1218         /* Update the bitmask, taking care to keep
1219          * the bits we're not allowed to change here */
1220         REISERFS_SB(s)->s_mount_opt =
1221             (REISERFS_SB(s)->
1222              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1223
1224         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1225                 journal->j_max_commit_age = commit_max_age;
1226                 journal->j_max_trans_age = commit_max_age;
1227         } else if (commit_max_age == 0) {
1228                 /* 0 means restore defaults. */
1229                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1230                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1231         }
1232
1233         if (blocks) {
1234                 err = reiserfs_resize(s, blocks);
1235                 if (err != 0)
1236                         goto out_err;
1237         }
1238
1239         if (*mount_flags & MS_RDONLY) {
1240                 reiserfs_xattr_init(s, *mount_flags);
1241                 /* remount read-only */
1242                 if (s->s_flags & MS_RDONLY)
1243                         /* it is read-only already */
1244                         goto out_ok;
1245
1246                 err = vfs_dq_off(s, 1);
1247                 if (err < 0 && err != -ENOSYS) {
1248                         err = -EBUSY;
1249                         goto out_err;
1250                 }
1251
1252                 /* try to remount file system with read-only permissions */
1253                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1254                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1255                         goto out_ok;
1256                 }
1257
1258                 err = journal_begin(&th, s, 10);
1259                 if (err)
1260                         goto out_err;
1261
1262                 /* Mounting a rw partition read-only. */
1263                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1264                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1265                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1266         } else {
1267                 /* remount read-write */
1268                 if (!(s->s_flags & MS_RDONLY)) {
1269                         reiserfs_xattr_init(s, *mount_flags);
1270                         goto out_ok;    /* We are read-write already */
1271                 }
1272
1273                 if (reiserfs_is_journal_aborted(journal)) {
1274                         err = journal->j_errno;
1275                         goto out_err;
1276                 }
1277
1278                 handle_data_mode(s, mount_options);
1279                 handle_barrier_mode(s, mount_options);
1280                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1281                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1282                 err = journal_begin(&th, s, 10);
1283                 if (err)
1284                         goto out_err;
1285
1286                 /* Mount a partition which is read-only, read-write */
1287                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1288                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1289                 s->s_flags &= ~MS_RDONLY;
1290                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1291                 if (!old_format_only(s))
1292                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1293                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1294                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1295                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1296         }
1297         /* this will force a full flush of all journal lists */
1298         SB_JOURNAL(s)->j_must_wait = 1;
1299         err = journal_end(&th, s, 10);
1300         if (err)
1301                 goto out_err;
1302         s->s_dirt = 0;
1303
1304         if (!(*mount_flags & MS_RDONLY)) {
1305                 vfs_dq_quota_on_remount(s);
1306                 finish_unfinished(s);
1307                 reiserfs_xattr_init(s, *mount_flags);
1308         }
1309
1310 out_ok:
1311         replace_mount_options(s, new_opts);
1312         reiserfs_write_unlock(s);
1313         return 0;
1314
1315 out_err:
1316         kfree(new_opts);
1317         reiserfs_write_unlock(s);
1318         return err;
1319 }
1320
1321 static int read_super_block(struct super_block *s, int offset)
1322 {
1323         struct buffer_head *bh;
1324         struct reiserfs_super_block *rs;
1325         int fs_blocksize;
1326
1327         bh = sb_bread(s, offset / s->s_blocksize);
1328         if (!bh) {
1329                 reiserfs_warning(s, "sh-2006",
1330                                  "bread failed (dev %s, block %lu, size %lu)",
1331                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1332                                  s->s_blocksize);
1333                 return 1;
1334         }
1335
1336         rs = (struct reiserfs_super_block *)bh->b_data;
1337         if (!is_any_reiserfs_magic_string(rs)) {
1338                 brelse(bh);
1339                 return 1;
1340         }
1341         //
1342         // ok, reiserfs signature (old or new) found in at the given offset
1343         //
1344         fs_blocksize = sb_blocksize(rs);
1345         brelse(bh);
1346         sb_set_blocksize(s, fs_blocksize);
1347
1348         bh = sb_bread(s, offset / s->s_blocksize);
1349         if (!bh) {
1350                 reiserfs_warning(s, "sh-2007",
1351                                  "bread failed (dev %s, block %lu, size %lu)",
1352                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1353                                  s->s_blocksize);
1354                 return 1;
1355         }
1356
1357         rs = (struct reiserfs_super_block *)bh->b_data;
1358         if (sb_blocksize(rs) != s->s_blocksize) {
1359                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1360                                  "filesystem on (dev %s, block %Lu, size %lu)",
1361                                  reiserfs_bdevname(s),
1362                                  (unsigned long long)bh->b_blocknr,
1363                                  s->s_blocksize);
1364                 brelse(bh);
1365                 return 1;
1366         }
1367
1368         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1369                 brelse(bh);
1370                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1371                                  "--rebuild-tree run detected. Please run\n"
1372                                  "reiserfsck --rebuild-tree and wait for a "
1373                                  "completion. If that fails\n"
1374                                  "get newer reiserfsprogs package");
1375                 return 1;
1376         }
1377
1378         SB_BUFFER_WITH_SB(s) = bh;
1379         SB_DISK_SUPER_BLOCK(s) = rs;
1380
1381         if (is_reiserfs_jr(rs)) {
1382                 /* magic is of non-standard journal filesystem, look at s_version to
1383                    find which format is in use */
1384                 if (sb_version(rs) == REISERFS_VERSION_2)
1385                         reiserfs_info(s, "found reiserfs format \"3.6\""
1386                                       " with non-standard journal\n");
1387                 else if (sb_version(rs) == REISERFS_VERSION_1)
1388                         reiserfs_info(s, "found reiserfs format \"3.5\""
1389                                       " with non-standard journal\n");
1390                 else {
1391                         reiserfs_warning(s, "sh-2012", "found unknown "
1392                                          "format \"%u\" of reiserfs with "
1393                                          "non-standard magic", sb_version(rs));
1394                         return 1;
1395                 }
1396         } else
1397                 /* s_version of standard format may contain incorrect information,
1398                    so we just look at the magic string */
1399                 reiserfs_info(s,
1400                               "found reiserfs format \"%s\" with standard journal\n",
1401                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1402
1403         s->s_op = &reiserfs_sops;
1404         s->s_export_op = &reiserfs_export_ops;
1405 #ifdef CONFIG_QUOTA
1406         s->s_qcop = &reiserfs_qctl_operations;
1407         s->dq_op = &reiserfs_quota_operations;
1408 #endif
1409
1410         /* new format is limited by the 32 bit wide i_blocks field, want to
1411          ** be one full block below that.
1412          */
1413         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1414         return 0;
1415 }
1416
1417 /* after journal replay, reread all bitmap and super blocks */
1418 static int reread_meta_blocks(struct super_block *s)
1419 {
1420         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1421         reiserfs_write_unlock(s);
1422         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1423         reiserfs_write_lock(s);
1424         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1425                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1426                 return 1;
1427         }
1428
1429         return 0;
1430 }
1431
1432 /////////////////////////////////////////////////////
1433 // hash detection stuff
1434
1435 // if root directory is empty - we set default - Yura's - hash and
1436 // warn about it
1437 // FIXME: we look for only one name in a directory. If tea and yura
1438 // bith have the same value - we ask user to send report to the
1439 // mailing list
1440 static __u32 find_hash_out(struct super_block *s)
1441 {
1442         int retval;
1443         struct inode *inode;
1444         struct cpu_key key;
1445         INITIALIZE_PATH(path);
1446         struct reiserfs_dir_entry de;
1447         __u32 hash = DEFAULT_HASH;
1448
1449         inode = s->s_root->d_inode;
1450
1451         do {                    // Some serious "goto"-hater was there ;)
1452                 u32 teahash, r5hash, yurahash;
1453
1454                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1455                 retval = search_by_entry_key(s, &key, &path, &de);
1456                 if (retval == IO_ERROR) {
1457                         pathrelse(&path);
1458                         return UNSET_HASH;
1459                 }
1460                 if (retval == NAME_NOT_FOUND)
1461                         de.de_entry_num--;
1462                 set_de_name_and_namelen(&de);
1463                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1464                         /* allow override in this case */
1465                         if (reiserfs_rupasov_hash(s)) {
1466                                 hash = YURA_HASH;
1467                         }
1468                         reiserfs_info(s, "FS seems to be empty, autodetect "
1469                                          "is using the default hash\n");
1470                         break;
1471                 }
1472                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1473                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1474                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1475                 if (((teahash == r5hash)
1476                      &&
1477                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1478                       == r5hash)) || ((teahash == yurahash)
1479                                       && (yurahash ==
1480                                           GET_HASH_VALUE(deh_offset
1481                                                          (&
1482                                                           (de.
1483                                                            de_deh[de.
1484                                                                   de_entry_num])))))
1485                     || ((r5hash == yurahash)
1486                         && (yurahash ==
1487                             GET_HASH_VALUE(deh_offset
1488                                            (&(de.de_deh[de.de_entry_num])))))) {
1489                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1490                                          "automatically detect hash function. "
1491                                          "Please mount with -o "
1492                                          "hash={tea,rupasov,r5}");
1493                         hash = UNSET_HASH;
1494                         break;
1495                 }
1496                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1497                     yurahash)
1498                         hash = YURA_HASH;
1499                 else if (GET_HASH_VALUE
1500                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1501                         hash = TEA_HASH;
1502                 else if (GET_HASH_VALUE
1503                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1504                         hash = R5_HASH;
1505                 else {
1506                         reiserfs_warning(s, "reiserfs-2506",
1507                                          "Unrecognised hash function");
1508                         hash = UNSET_HASH;
1509                 }
1510         } while (0);
1511
1512         pathrelse(&path);
1513         return hash;
1514 }
1515
1516 // finds out which hash names are sorted with
1517 static int what_hash(struct super_block *s)
1518 {
1519         __u32 code;
1520
1521         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1522
1523         /* reiserfs_hash_detect() == true if any of the hash mount options
1524          ** were used.  We must check them to make sure the user isn't
1525          ** using a bad hash value
1526          */
1527         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1528                 code = find_hash_out(s);
1529
1530         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1531                 /* detection has found the hash, and we must check against the
1532                  ** mount options
1533                  */
1534                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1535                         reiserfs_warning(s, "reiserfs-2507",
1536                                          "Error, %s hash detected, "
1537                                          "unable to force rupasov hash",
1538                                          reiserfs_hashname(code));
1539                         code = UNSET_HASH;
1540                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1541                         reiserfs_warning(s, "reiserfs-2508",
1542                                          "Error, %s hash detected, "
1543                                          "unable to force tea hash",
1544                                          reiserfs_hashname(code));
1545                         code = UNSET_HASH;
1546                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1547                         reiserfs_warning(s, "reiserfs-2509",
1548                                          "Error, %s hash detected, "
1549                                          "unable to force r5 hash",
1550                                          reiserfs_hashname(code));
1551                         code = UNSET_HASH;
1552                 }
1553         } else {
1554                 /* find_hash_out was not called or could not determine the hash */
1555                 if (reiserfs_rupasov_hash(s)) {
1556                         code = YURA_HASH;
1557                 } else if (reiserfs_tea_hash(s)) {
1558                         code = TEA_HASH;
1559                 } else if (reiserfs_r5_hash(s)) {
1560                         code = R5_HASH;
1561                 }
1562         }
1563
1564         /* if we are mounted RW, and we have a new valid hash code, update
1565          ** the super
1566          */
1567         if (code != UNSET_HASH &&
1568             !(s->s_flags & MS_RDONLY) &&
1569             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1570                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1571         }
1572         return code;
1573 }
1574
1575 // return pointer to appropriate function
1576 static hashf_t hash_function(struct super_block *s)
1577 {
1578         switch (what_hash(s)) {
1579         case TEA_HASH:
1580                 reiserfs_info(s, "Using tea hash to sort names\n");
1581                 return keyed_hash;
1582         case YURA_HASH:
1583                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1584                 return yura_hash;
1585         case R5_HASH:
1586                 reiserfs_info(s, "Using r5 hash to sort names\n");
1587                 return r5_hash;
1588         }
1589         return NULL;
1590 }
1591
1592 // this is used to set up correct value for old partitions
1593 static int function2code(hashf_t func)
1594 {
1595         if (func == keyed_hash)
1596                 return TEA_HASH;
1597         if (func == yura_hash)
1598                 return YURA_HASH;
1599         if (func == r5_hash)
1600                 return R5_HASH;
1601
1602         BUG();                  // should never happen
1603
1604         return 0;
1605 }
1606
1607 #define SWARN(silent, s, id, ...)                       \
1608         if (!(silent))                          \
1609                 reiserfs_warning(s, id, __VA_ARGS__)
1610
1611 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1612 {
1613         struct inode *root_inode;
1614         struct reiserfs_transaction_handle th;
1615         int old_format = 0;
1616         unsigned long blocks;
1617         unsigned int commit_max_age = 0;
1618         int jinit_done = 0;
1619         struct reiserfs_iget_args args;
1620         struct reiserfs_super_block *rs;
1621         char *jdev_name;
1622         struct reiserfs_sb_info *sbi;
1623         int errval = -EINVAL;
1624         char *qf_names[MAXQUOTAS] = {};
1625         unsigned int qfmt = 0;
1626
1627         save_mount_options(s, data);
1628
1629         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1630         if (!sbi)
1631                 return -ENOMEM;
1632         s->s_fs_info = sbi;
1633         /* Set default values for options: non-aggressive tails, RO on errors */
1634         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1635         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1636         /* no preallocation minimum, be smart in
1637            reiserfs_file_write instead */
1638         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1639         /* Preallocate by 16 blocks (17-1) at once */
1640         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1641         /* setup default block allocator options */
1642         reiserfs_init_alloc_options(s);
1643
1644         mutex_init(&REISERFS_SB(s)->lock);
1645         REISERFS_SB(s)->lock_depth = -1;
1646
1647         /*
1648          * This function is called with the bkl, which also was the old
1649          * locking used here.
1650          * do_journal_begin() will soon check if we hold the lock (ie: was the
1651          * bkl). This is likely because do_journal_begin() has several another
1652          * callers because at this time, it doesn't seem to be necessary to
1653          * protect against anything.
1654          * Anyway, let's be conservative and lock for now.
1655          */
1656         reiserfs_write_lock(s);
1657
1658         jdev_name = NULL;
1659         if (reiserfs_parse_options
1660             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1661              &commit_max_age, qf_names, &qfmt) == 0) {
1662                 goto error;
1663         }
1664 #ifdef CONFIG_QUOTA
1665         handle_quota_files(s, qf_names, &qfmt);
1666 #endif
1667
1668         if (blocks) {
1669                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1670                 goto error;
1671         }
1672
1673         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1674         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1675                 old_format = 1;
1676         /* try new format (64-th 1k block), which can contain reiserfs super block */
1677         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1678                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1679                       reiserfs_bdevname(s));
1680                 goto error;
1681         }
1682
1683         rs = SB_DISK_SUPER_BLOCK(s);
1684         /* Let's do basic sanity check to verify that underlying device is not
1685            smaller than the filesystem. If the check fails then abort and scream,
1686            because bad stuff will happen otherwise. */
1687         if (s->s_bdev && s->s_bdev->bd_inode
1688             && i_size_read(s->s_bdev->bd_inode) <
1689             sb_block_count(rs) * sb_blocksize(rs)) {
1690                 SWARN(silent, s, "", "Filesystem cannot be "
1691                       "mounted because it is bigger than the device");
1692                 SWARN(silent, s, "", "You may need to run fsck "
1693                       "or increase size of your LVM partition");
1694                 SWARN(silent, s, "", "Or may be you forgot to "
1695                       "reboot after fdisk when it told you to");
1696                 goto error;
1697         }
1698
1699         sbi->s_mount_state = SB_REISERFS_STATE(s);
1700         sbi->s_mount_state = REISERFS_VALID_FS;
1701
1702         if ((errval = reiserfs_init_bitmap_cache(s))) {
1703                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1704                 goto error;
1705         }
1706         errval = -EINVAL;
1707 #ifdef CONFIG_REISERFS_CHECK
1708         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1709         SWARN(silent, s, "", "- it is slow mode for debugging.");
1710 #endif
1711
1712         /* make data=ordered the default */
1713         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1714             !reiserfs_data_writeback(s)) {
1715                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1716         }
1717
1718         if (reiserfs_data_log(s)) {
1719                 reiserfs_info(s, "using journaled data mode\n");
1720         } else if (reiserfs_data_ordered(s)) {
1721                 reiserfs_info(s, "using ordered data mode\n");
1722         } else {
1723                 reiserfs_info(s, "using writeback data mode\n");
1724         }
1725         if (reiserfs_barrier_flush(s)) {
1726                 printk("reiserfs: using flush barriers\n");
1727         }
1728         // set_device_ro(s->s_dev, 1) ;
1729         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1730                 SWARN(silent, s, "sh-2022",
1731                       "unable to initialize journal space");
1732                 goto error;
1733         } else {
1734                 jinit_done = 1; /* once this is set, journal_release must be called
1735                                  ** if we error out of the mount
1736                                  */
1737         }
1738         if (reread_meta_blocks(s)) {
1739                 SWARN(silent, s, "jmacd-9",
1740                       "unable to reread meta blocks after journal init");
1741                 goto error;
1742         }
1743
1744         if (replay_only(s))
1745                 goto error;
1746
1747         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1748                 SWARN(silent, s, "clm-7000",
1749                       "Detected readonly device, marking FS readonly");
1750                 s->s_flags |= MS_RDONLY;
1751         }
1752         args.objectid = REISERFS_ROOT_OBJECTID;
1753         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1754         root_inode =
1755             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1756                          reiserfs_init_locked_inode, (void *)(&args));
1757         if (!root_inode) {
1758                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1759                 goto error;
1760         }
1761
1762         if (root_inode->i_state & I_NEW) {
1763                 reiserfs_read_locked_inode(root_inode, &args);
1764                 unlock_new_inode(root_inode);
1765         }
1766
1767         s->s_root = d_alloc_root(root_inode);
1768         if (!s->s_root) {
1769                 iput(root_inode);
1770                 goto error;
1771         }
1772         // define and initialize hash function
1773         sbi->s_hash_function = hash_function(s);
1774         if (sbi->s_hash_function == NULL) {
1775                 dput(s->s_root);
1776                 s->s_root = NULL;
1777                 goto error;
1778         }
1779
1780         if (is_reiserfs_3_5(rs)
1781             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1782                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1783         else if (old_format)
1784                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1785         else
1786                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1787
1788         if (!(s->s_flags & MS_RDONLY)) {
1789
1790                 errval = journal_begin(&th, s, 1);
1791                 if (errval) {
1792                         dput(s->s_root);
1793                         s->s_root = NULL;
1794                         goto error;
1795                 }
1796                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1797
1798                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1799                 set_sb_fs_state(rs, 0);
1800
1801                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1802                  * case, but older revisions can't. This will cause the
1803                  * file system to fail mount on those older implementations,
1804                  * avoiding corruption. -jeffm */
1805                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1806                     sb_bmap_nr(rs) != 0) {
1807                         reiserfs_warning(s, "super-2030", "This file system "
1808                                         "claims to use %u bitmap blocks in "
1809                                         "its super block, but requires %u. "
1810                                         "Clearing to zero.", sb_bmap_nr(rs),
1811                                         reiserfs_bmap_count(s));
1812
1813                         set_sb_bmap_nr(rs, 0);
1814                 }
1815
1816                 if (old_format_only(s)) {
1817                         /* filesystem of format 3.5 either with standard or non-standard
1818                            journal */
1819                         if (convert_reiserfs(s)) {
1820                                 /* and -o conv is given */
1821                                 if (!silent)
1822                                         reiserfs_info(s,
1823                                                       "converting 3.5 filesystem to the 3.6 format");
1824
1825                                 if (is_reiserfs_3_5(rs))
1826                                         /* put magic string of 3.6 format. 2.2 will not be able to
1827                                            mount this filesystem anymore */
1828                                         memcpy(rs->s_v1.s_magic,
1829                                                reiserfs_3_6_magic_string,
1830                                                sizeof
1831                                                (reiserfs_3_6_magic_string));
1832
1833                                 set_sb_version(rs, REISERFS_VERSION_2);
1834                                 reiserfs_convert_objectid_map_v1(s);
1835                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1836                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1837                         } else if (!silent) {
1838                                 reiserfs_info(s, "using 3.5.x disk format\n");
1839                         }
1840                 } else
1841                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1842
1843
1844                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1845                 errval = journal_end(&th, s, 1);
1846                 if (errval) {
1847                         dput(s->s_root);
1848                         s->s_root = NULL;
1849                         goto error;
1850                 }
1851
1852                 if ((errval = reiserfs_lookup_privroot(s)) ||
1853                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1854                         dput(s->s_root);
1855                         s->s_root = NULL;
1856                         goto error;
1857                 }
1858
1859                 /* look for files which were to be removed in previous session */
1860                 finish_unfinished(s);
1861         } else {
1862                 if (old_format_only(s) && !silent) {
1863                         reiserfs_info(s, "using 3.5.x disk format\n");
1864                 }
1865
1866                 if ((errval = reiserfs_lookup_privroot(s)) ||
1867                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1868                         dput(s->s_root);
1869                         s->s_root = NULL;
1870                         goto error;
1871                 }
1872         }
1873         // mark hash in super block: it could be unset. overwrite should be ok
1874         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1875
1876         handle_attrs(s);
1877
1878         reiserfs_proc_info_init(s);
1879
1880         init_waitqueue_head(&(sbi->s_wait));
1881         spin_lock_init(&sbi->bitmap_lock);
1882
1883         reiserfs_write_unlock(s);
1884
1885         return (0);
1886
1887 error:
1888         if (jinit_done) {       /* kill the commit thread, free journal ram */
1889                 journal_release_error(NULL, s);
1890         }
1891
1892         reiserfs_write_unlock(s);
1893
1894         reiserfs_free_bitmap_cache(s);
1895         if (SB_BUFFER_WITH_SB(s))
1896                 brelse(SB_BUFFER_WITH_SB(s));
1897 #ifdef CONFIG_QUOTA
1898         {
1899                 int j;
1900                 for (j = 0; j < MAXQUOTAS; j++)
1901                         kfree(qf_names[j]);
1902         }
1903 #endif
1904         kfree(sbi);
1905
1906         s->s_fs_info = NULL;
1907         return errval;
1908 }
1909
1910 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1911 {
1912         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1913
1914         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1915         buf->f_bfree = sb_free_blocks(rs);
1916         buf->f_bavail = buf->f_bfree;
1917         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1918         buf->f_bsize = dentry->d_sb->s_blocksize;
1919         /* changed to accommodate gcc folks. */
1920         buf->f_type = REISERFS_SUPER_MAGIC;
1921         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1922         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1923                                 sizeof(rs->s_uuid)/2);
1924
1925         return 0;
1926 }
1927
1928 #ifdef CONFIG_QUOTA
1929 static int reiserfs_write_dquot(struct dquot *dquot)
1930 {
1931         struct reiserfs_transaction_handle th;
1932         int ret, err;
1933
1934         reiserfs_write_lock(dquot->dq_sb);
1935         ret =
1936             journal_begin(&th, dquot->dq_sb,
1937                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1938         if (ret)
1939                 goto out;
1940         ret = dquot_commit(dquot);
1941         err =
1942             journal_end(&th, dquot->dq_sb,
1943                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1944         if (!ret && err)
1945                 ret = err;
1946       out:
1947         reiserfs_write_unlock(dquot->dq_sb);
1948         return ret;
1949 }
1950
1951 static int reiserfs_acquire_dquot(struct dquot *dquot)
1952 {
1953         struct reiserfs_transaction_handle th;
1954         int ret, err;
1955
1956         reiserfs_write_lock(dquot->dq_sb);
1957         ret =
1958             journal_begin(&th, dquot->dq_sb,
1959                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1960         if (ret)
1961                 goto out;
1962         ret = dquot_acquire(dquot);
1963         err =
1964             journal_end(&th, dquot->dq_sb,
1965                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1966         if (!ret && err)
1967                 ret = err;
1968       out:
1969         reiserfs_write_unlock(dquot->dq_sb);
1970         return ret;
1971 }
1972
1973 static int reiserfs_release_dquot(struct dquot *dquot)
1974 {
1975         struct reiserfs_transaction_handle th;
1976         int ret, err;
1977
1978         reiserfs_write_lock(dquot->dq_sb);
1979         ret =
1980             journal_begin(&th, dquot->dq_sb,
1981                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1982         if (ret) {
1983                 /* Release dquot anyway to avoid endless cycle in dqput() */
1984                 dquot_release(dquot);
1985                 goto out;
1986         }
1987         ret = dquot_release(dquot);
1988         err =
1989             journal_end(&th, dquot->dq_sb,
1990                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1991         if (!ret && err)
1992                 ret = err;
1993       out:
1994         reiserfs_write_unlock(dquot->dq_sb);
1995         return ret;
1996 }
1997
1998 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1999 {
2000         /* Are we journaling quotas? */
2001         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2002             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2003                 dquot_mark_dquot_dirty(dquot);
2004                 return reiserfs_write_dquot(dquot);
2005         } else
2006                 return dquot_mark_dquot_dirty(dquot);
2007 }
2008
2009 static int reiserfs_write_info(struct super_block *sb, int type)
2010 {
2011         struct reiserfs_transaction_handle th;
2012         int ret, err;
2013
2014         /* Data block + inode block */
2015         reiserfs_write_lock(sb);
2016         ret = journal_begin(&th, sb, 2);
2017         if (ret)
2018                 goto out;
2019         ret = dquot_commit_info(sb, type);
2020         err = journal_end(&th, sb, 2);
2021         if (!ret && err)
2022                 ret = err;
2023       out:
2024         reiserfs_write_unlock(sb);
2025         return ret;
2026 }
2027
2028 /*
2029  * Turn on quotas during mount time - we need to find the quota file and such...
2030  */
2031 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2032 {
2033         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2034                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2035 }
2036
2037 /*
2038  * Standard function to be called on quota_on
2039  */
2040 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2041                              char *name, int remount)
2042 {
2043         int err;
2044         struct path path;
2045         struct inode *inode;
2046         struct reiserfs_transaction_handle th;
2047
2048         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2049                 return -EINVAL;
2050         /* No more checks needed? Path and format_id are bogus anyway... */
2051         if (remount)
2052                 return vfs_quota_on(sb, type, format_id, name, 1);
2053         err = kern_path(name, LOOKUP_FOLLOW, &path);
2054         if (err)
2055                 return err;
2056         /* Quotafile not on the same filesystem? */
2057         if (path.mnt->mnt_sb != sb) {
2058                 err = -EXDEV;
2059                 goto out;
2060         }
2061         inode = path.dentry->d_inode;
2062         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2063         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2064                 err = reiserfs_unpack(inode, NULL);
2065                 if (err) {
2066                         reiserfs_warning(sb, "super-6520",
2067                                 "Unpacking tail of quota file failed"
2068                                 " (%d). Cannot turn on quotas.", err);
2069                         err = -EINVAL;
2070                         goto out;
2071                 }
2072                 mark_inode_dirty(inode);
2073         }
2074         /* Journaling quota? */
2075         if (REISERFS_SB(sb)->s_qf_names[type]) {
2076                 /* Quotafile not of fs root? */
2077                 if (path.dentry->d_parent != sb->s_root)
2078                         reiserfs_warning(sb, "super-6521",
2079                                  "Quota file not on filesystem root. "
2080                                  "Journalled quota will not work.");
2081         }
2082
2083         /*
2084          * When we journal data on quota file, we have to flush journal to see
2085          * all updates to the file when we bypass pagecache...
2086          */
2087         if (reiserfs_file_data_log(inode)) {
2088                 /* Just start temporary transaction and finish it */
2089                 err = journal_begin(&th, sb, 1);
2090                 if (err)
2091                         goto out;
2092                 err = journal_end_sync(&th, sb, 1);
2093                 if (err)
2094                         goto out;
2095         }
2096         err = vfs_quota_on_path(sb, type, format_id, &path);
2097 out:
2098         path_put(&path);
2099         return err;
2100 }
2101
2102 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2103  * acquiring the locks... As quota files are never truncated and quota code
2104  * itself serializes the operations (and noone else should touch the files)
2105  * we don't have to be afraid of races */
2106 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2107                                    size_t len, loff_t off)
2108 {
2109         struct inode *inode = sb_dqopt(sb)->files[type];
2110         unsigned long blk = off >> sb->s_blocksize_bits;
2111         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2112         size_t toread;
2113         struct buffer_head tmp_bh, *bh;
2114         loff_t i_size = i_size_read(inode);
2115
2116         if (off > i_size)
2117                 return 0;
2118         if (off + len > i_size)
2119                 len = i_size - off;
2120         toread = len;
2121         while (toread > 0) {
2122                 tocopy =
2123                     sb->s_blocksize - offset <
2124                     toread ? sb->s_blocksize - offset : toread;
2125                 tmp_bh.b_state = 0;
2126                 /* Quota files are without tails so we can safely use this function */
2127                 reiserfs_write_lock(sb);
2128                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2129                 reiserfs_write_unlock(sb);
2130                 if (err)
2131                         return err;
2132                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2133                         memset(data, 0, tocopy);
2134                 else {
2135                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2136                         if (!bh)
2137                                 return -EIO;
2138                         memcpy(data, bh->b_data + offset, tocopy);
2139                         brelse(bh);
2140                 }
2141                 offset = 0;
2142                 toread -= tocopy;
2143                 data += tocopy;
2144                 blk++;
2145         }
2146         return len;
2147 }
2148
2149 /* Write to quotafile (we know the transaction is already started and has
2150  * enough credits) */
2151 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2152                                     const char *data, size_t len, loff_t off)
2153 {
2154         struct inode *inode = sb_dqopt(sb)->files[type];
2155         unsigned long blk = off >> sb->s_blocksize_bits;
2156         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2157         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2158         size_t towrite = len;
2159         struct buffer_head tmp_bh, *bh;
2160
2161         if (!current->journal_info) {
2162                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2163                         " cancelled because transaction is not started.\n",
2164                         (unsigned long long)off, (unsigned long long)len);
2165                 return -EIO;
2166         }
2167         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2168         while (towrite > 0) {
2169                 tocopy = sb->s_blocksize - offset < towrite ?
2170                     sb->s_blocksize - offset : towrite;
2171                 tmp_bh.b_state = 0;
2172                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2173                 if (err)
2174                         goto out;
2175                 if (offset || tocopy != sb->s_blocksize)
2176                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2177                 else
2178                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2179                 if (!bh) {
2180                         err = -EIO;
2181                         goto out;
2182                 }
2183                 lock_buffer(bh);
2184                 memcpy(bh->b_data + offset, data, tocopy);
2185                 flush_dcache_page(bh->b_page);
2186                 set_buffer_uptodate(bh);
2187                 unlock_buffer(bh);
2188                 reiserfs_prepare_for_journal(sb, bh, 1);
2189                 journal_mark_dirty(current->journal_info, sb, bh);
2190                 if (!journal_quota)
2191                         reiserfs_add_ordered_list(inode, bh);
2192                 brelse(bh);
2193                 offset = 0;
2194                 towrite -= tocopy;
2195                 data += tocopy;
2196                 blk++;
2197         }
2198 out:
2199         if (len == towrite) {
2200                 mutex_unlock(&inode->i_mutex);
2201                 return err;
2202         }
2203         if (inode->i_size < off + len - towrite)
2204                 i_size_write(inode, off + len - towrite);
2205         inode->i_version++;
2206         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2207         mark_inode_dirty(inode);
2208         mutex_unlock(&inode->i_mutex);
2209         return len - towrite;
2210 }
2211
2212 #endif
2213
2214 static int get_super_block(struct file_system_type *fs_type,
2215                            int flags, const char *dev_name,
2216                            void *data, struct vfsmount *mnt)
2217 {
2218         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2219                            mnt);
2220 }
2221
2222 static int __init init_reiserfs_fs(void)
2223 {
2224         int ret;
2225
2226         if ((ret = init_inodecache())) {
2227                 return ret;
2228         }
2229
2230         reiserfs_proc_info_global_init();
2231
2232         ret = register_filesystem(&reiserfs_fs_type);
2233
2234         if (ret == 0) {
2235                 return 0;
2236         }
2237
2238         reiserfs_proc_info_global_done();
2239         destroy_inodecache();
2240
2241         return ret;
2242 }
2243
2244 static void __exit exit_reiserfs_fs(void)
2245 {
2246         reiserfs_proc_info_global_done();
2247         unregister_filesystem(&reiserfs_fs_type);
2248         destroy_inodecache();
2249 }
2250
2251 struct file_system_type reiserfs_fs_type = {
2252         .owner = THIS_MODULE,
2253         .name = "reiserfs",
2254         .get_sb = get_super_block,
2255         .kill_sb = reiserfs_kill_sb,
2256         .fs_flags = FS_REQUIRES_DEV,
2257 };
2258
2259 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2260 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2261 MODULE_LICENSE("GPL");
2262
2263 module_init(init_reiserfs_fs);
2264 module_exit(exit_reiserfs_fs);