Fix reiserfs_file_release()
[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         int quota_enabled[MAXQUOTAS];
162 #endif
163
164         /* compose key to look for "save" links */
165         max_cpu_key.version = KEY_FORMAT_3_5;
166         max_cpu_key.on_disk_key.k_dir_id = ~0U;
167         max_cpu_key.on_disk_key.k_objectid = ~0U;
168         set_cpu_key_k_offset(&max_cpu_key, ~0U);
169         max_cpu_key.key_length = 3;
170
171         memset(&last_inode_key, 0, sizeof(last_inode_key));
172
173 #ifdef CONFIG_QUOTA
174         /* Needed for iput() to work correctly and not trash data */
175         if (s->s_flags & MS_ACTIVE) {
176                 ms_active_set = 0;
177         } else {
178                 ms_active_set = 1;
179                 s->s_flags |= MS_ACTIVE;
180         }
181         /* Turn on quotas so that they are updated correctly */
182         for (i = 0; i < MAXQUOTAS; i++) {
183                 quota_enabled[i] = 1;
184                 if (REISERFS_SB(s)->s_qf_names[i]) {
185                         int ret;
186
187                         if (sb_has_quota_active(s, i)) {
188                                 quota_enabled[i] = 0;
189                                 continue;
190                         }
191                         ret = reiserfs_quota_on_mount(s, i);
192                         if (ret < 0)
193                                 reiserfs_warning(s, "reiserfs-2500",
194                                                  "cannot turn on journaled "
195                                                  "quota: error %d", ret);
196                 }
197         }
198 #endif
199
200         done = 0;
201         REISERFS_SB(s)->s_is_unlinked_ok = 1;
202         while (!retval) {
203                 retval = search_item(s, &max_cpu_key, &path);
204                 if (retval != ITEM_NOT_FOUND) {
205                         reiserfs_error(s, "vs-2140",
206                                        "search_by_key returned %d", retval);
207                         break;
208                 }
209
210                 bh = get_last_bh(&path);
211                 item_pos = get_item_pos(&path);
212                 if (item_pos != B_NR_ITEMS(bh)) {
213                         reiserfs_warning(s, "vs-2060",
214                                          "wrong position found");
215                         break;
216                 }
217                 item_pos--;
218                 ih = B_N_PITEM_HEAD(bh, item_pos);
219
220                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
221                         /* there are no "save" links anymore */
222                         break;
223
224                 save_link_key = ih->ih_key;
225                 if (is_indirect_le_ih(ih))
226                         truncate = 1;
227                 else
228                         truncate = 0;
229
230                 /* reiserfs_iget needs k_dirid and k_objectid only */
231                 item = B_I_PITEM(bh, ih);
232                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
233                 obj_key.on_disk_key.k_objectid =
234                     le32_to_cpu(ih->ih_key.k_objectid);
235                 obj_key.on_disk_key.k_offset = 0;
236                 obj_key.on_disk_key.k_type = 0;
237
238                 pathrelse(&path);
239
240                 inode = reiserfs_iget(s, &obj_key);
241                 if (!inode) {
242                         /* the unlink almost completed, it just did not manage to remove
243                            "save" link and release objectid */
244                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
245                                          &obj_key);
246                         retval = remove_save_link_only(s, &save_link_key, 1);
247                         continue;
248                 }
249
250                 if (!truncate && inode->i_nlink) {
251                         /* file is not unlinked */
252                         reiserfs_warning(s, "vs-2185",
253                                          "file %K is not unlinked",
254                                          &obj_key);
255                         retval = remove_save_link_only(s, &save_link_key, 0);
256                         continue;
257                 }
258                 dquot_initialize(inode);
259
260                 if (truncate && S_ISDIR(inode->i_mode)) {
261                         /* We got a truncate request for a dir which is impossible.
262                            The only imaginable way is to execute unfinished truncate request
263                            then boot into old kernel, remove the file and create dir with
264                            the same key. */
265                         reiserfs_warning(s, "green-2101",
266                                          "impossible truncate on a "
267                                          "directory %k. Please report",
268                                          INODE_PKEY(inode));
269                         retval = remove_save_link_only(s, &save_link_key, 0);
270                         truncate = 0;
271                         iput(inode);
272                         continue;
273                 }
274
275                 if (truncate) {
276                         REISERFS_I(inode)->i_flags |=
277                             i_link_saved_truncate_mask;
278                         /* not completed truncate found. New size was committed together
279                            with "save" link */
280                         reiserfs_info(s, "Truncating %k to %Ld ..",
281                                       INODE_PKEY(inode), inode->i_size);
282                         reiserfs_truncate_file(inode,
283                                                0
284                                                /*don't update modification time */
285                                                );
286                         retval = remove_save_link(inode, truncate);
287                 } else {
288                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
289                         /* not completed unlink (rmdir) found */
290                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
291                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
292                                         sizeof(last_inode_key))){
293                                 last_inode_key = *INODE_PKEY(inode);
294                                 /* removal gets completed in iput */
295                                 retval = 0;
296                         } else {
297                                 reiserfs_warning(s, "super-2189", "Dead loop "
298                                                  "in finish_unfinished "
299                                                  "detected, just remove "
300                                                  "save link\n");
301                                 retval = remove_save_link_only(s,
302                                                         &save_link_key, 0);
303                         }
304                 }
305
306                 iput(inode);
307                 printk("done\n");
308                 done++;
309         }
310         REISERFS_SB(s)->s_is_unlinked_ok = 0;
311
312 #ifdef CONFIG_QUOTA
313         /* Turn quotas off */
314         for (i = 0; i < MAXQUOTAS; i++) {
315                 if (sb_dqopt(s)->files[i] && quota_enabled[i])
316                         dquot_quota_off(s, i);
317         }
318         if (ms_active_set)
319                 /* Restore the flag back */
320                 s->s_flags &= ~MS_ACTIVE;
321 #endif
322         pathrelse(&path);
323         if (done)
324                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
325                               "Completed\n", done);
326         return retval;
327 }
328
329 /* to protect file being unlinked from getting lost we "safe" link files
330    being unlinked. This link will be deleted in the same transaction with last
331    item of file. mounting the filesystem we scan all these links and remove
332    files which almost got lost */
333 void add_save_link(struct reiserfs_transaction_handle *th,
334                    struct inode *inode, int truncate)
335 {
336         INITIALIZE_PATH(path);
337         int retval;
338         struct cpu_key key;
339         struct item_head ih;
340         __le32 link;
341
342         BUG_ON(!th->t_trans_id);
343
344         /* file can only get one "save link" of each kind */
345         RFALSE(truncate &&
346                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
347                "saved link already exists for truncated inode %lx",
348                (long)inode->i_ino);
349         RFALSE(!truncate &&
350                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
351                "saved link already exists for unlinked inode %lx",
352                (long)inode->i_ino);
353
354         /* setup key of "save" link */
355         key.version = KEY_FORMAT_3_5;
356         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
357         key.on_disk_key.k_objectid = inode->i_ino;
358         if (!truncate) {
359                 /* unlink, rmdir, rename */
360                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
361                 set_cpu_key_k_type(&key, TYPE_DIRECT);
362
363                 /* item head of "safe" link */
364                 make_le_item_head(&ih, &key, key.version,
365                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
366                                   4 /*length */ , 0xffff /*free space */ );
367         } else {
368                 /* truncate */
369                 if (S_ISDIR(inode->i_mode))
370                         reiserfs_warning(inode->i_sb, "green-2102",
371                                          "Adding a truncate savelink for "
372                                          "a directory %k! Please report",
373                                          INODE_PKEY(inode));
374                 set_cpu_key_k_offset(&key, 1);
375                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
376
377                 /* item head of "safe" link */
378                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
379                                   4 /*length */ , 0 /*free space */ );
380         }
381         key.key_length = 3;
382
383         /* look for its place in the tree */
384         retval = search_item(inode->i_sb, &key, &path);
385         if (retval != ITEM_NOT_FOUND) {
386                 if (retval != -ENOSPC)
387                         reiserfs_error(inode->i_sb, "vs-2100",
388                                        "search_by_key (%K) returned %d", &key,
389                                        retval);
390                 pathrelse(&path);
391                 return;
392         }
393
394         /* body of "save" link */
395         link = INODE_PKEY(inode)->k_dir_id;
396
397         /* put "save" link inot tree, don't charge quota to anyone */
398         retval =
399             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
400         if (retval) {
401                 if (retval != -ENOSPC)
402                         reiserfs_error(inode->i_sb, "vs-2120",
403                                        "insert_item returned %d", retval);
404         } else {
405                 if (truncate)
406                         REISERFS_I(inode)->i_flags |=
407                             i_link_saved_truncate_mask;
408                 else
409                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
410         }
411 }
412
413 /* this opens transaction unlike add_save_link */
414 int remove_save_link(struct inode *inode, int truncate)
415 {
416         struct reiserfs_transaction_handle th;
417         struct reiserfs_key key;
418         int err;
419
420         /* we are going to do one balancing only */
421         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
422         if (err)
423                 return err;
424
425         /* setup key of "save" link */
426         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
427         key.k_objectid = INODE_PKEY(inode)->k_objectid;
428         if (!truncate) {
429                 /* unlink, rmdir, rename */
430                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
431                                     1 + inode->i_sb->s_blocksize);
432                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
433         } else {
434                 /* truncate */
435                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
436                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
437         }
438
439         if ((truncate &&
440              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
441             (!truncate &&
442              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
443                 /* don't take quota bytes from anywhere */
444                 reiserfs_delete_solid_item(&th, NULL, &key);
445         if (!truncate) {
446                 reiserfs_release_objectid(&th, inode->i_ino);
447                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
448         } else
449                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
450
451         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
452 }
453
454 static void reiserfs_kill_sb(struct super_block *s)
455 {
456         if (REISERFS_SB(s)) {
457                 if (REISERFS_SB(s)->xattr_root) {
458                         d_invalidate(REISERFS_SB(s)->xattr_root);
459                         dput(REISERFS_SB(s)->xattr_root);
460                         REISERFS_SB(s)->xattr_root = NULL;
461                 }
462                 if (REISERFS_SB(s)->priv_root) {
463                         d_invalidate(REISERFS_SB(s)->priv_root);
464                         dput(REISERFS_SB(s)->priv_root);
465                         REISERFS_SB(s)->priv_root = NULL;
466                 }
467         }
468
469         kill_block_super(s);
470 }
471
472 static void reiserfs_put_super(struct super_block *s)
473 {
474         struct reiserfs_transaction_handle th;
475         th.t_trans_id = 0;
476
477         dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
478
479         reiserfs_write_lock(s);
480
481         if (s->s_dirt)
482                 reiserfs_write_super(s);
483
484         /* change file system state to current state if it was mounted with read-write permissions */
485         if (!(s->s_flags & MS_RDONLY)) {
486                 if (!journal_begin(&th, s, 10)) {
487                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
488                                                      1);
489                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
490                                             REISERFS_SB(s)->s_mount_state);
491                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
492                 }
493         }
494
495         /* note, journal_release checks for readonly mount, and can decide not
496          ** to do a journal_end
497          */
498         journal_release(&th, s);
499
500         reiserfs_free_bitmap_cache(s);
501
502         brelse(SB_BUFFER_WITH_SB(s));
503
504         print_statistics(s);
505
506         if (REISERFS_SB(s)->reserved_blocks != 0) {
507                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
508                                  REISERFS_SB(s)->reserved_blocks);
509         }
510
511         reiserfs_proc_info_done(s);
512
513         reiserfs_write_unlock(s);
514         mutex_destroy(&REISERFS_SB(s)->lock);
515         kfree(s->s_fs_info);
516         s->s_fs_info = NULL;
517 }
518
519 static struct kmem_cache *reiserfs_inode_cachep;
520
521 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
522 {
523         struct reiserfs_inode_info *ei;
524         ei = (struct reiserfs_inode_info *)
525             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
526         if (!ei)
527                 return NULL;
528         atomic_set(&ei->openers, 0);
529         mutex_init(&ei->tailpack);
530         return &ei->vfs_inode;
531 }
532
533 static void reiserfs_destroy_inode(struct inode *inode)
534 {
535         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
536 }
537
538 static void init_once(void *foo)
539 {
540         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
541
542         INIT_LIST_HEAD(&ei->i_prealloc_list);
543         inode_init_once(&ei->vfs_inode);
544 }
545
546 static int init_inodecache(void)
547 {
548         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
549                                                   sizeof(struct
550                                                          reiserfs_inode_info),
551                                                   0, (SLAB_RECLAIM_ACCOUNT|
552                                                         SLAB_MEM_SPREAD),
553                                                   init_once);
554         if (reiserfs_inode_cachep == NULL)
555                 return -ENOMEM;
556         return 0;
557 }
558
559 static void destroy_inodecache(void)
560 {
561         kmem_cache_destroy(reiserfs_inode_cachep);
562 }
563
564 /* we don't mark inodes dirty, we just log them */
565 static void reiserfs_dirty_inode(struct inode *inode)
566 {
567         struct reiserfs_transaction_handle th;
568
569         int err = 0;
570         int lock_depth;
571
572         if (inode->i_sb->s_flags & MS_RDONLY) {
573                 reiserfs_warning(inode->i_sb, "clm-6006",
574                                  "writing inode %lu on readonly FS",
575                                  inode->i_ino);
576                 return;
577         }
578         lock_depth = reiserfs_write_lock_once(inode->i_sb);
579
580         /* this is really only used for atime updates, so they don't have
581          ** to be included in O_SYNC or fsync
582          */
583         err = journal_begin(&th, inode->i_sb, 1);
584         if (err)
585                 goto out;
586
587         reiserfs_update_sd(&th, inode);
588         journal_end(&th, inode->i_sb, 1);
589
590 out:
591         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
592 }
593
594 static void reiserfs_clear_inode(struct inode *inode)
595 {
596         dquot_drop(inode);
597 }
598
599 #ifdef CONFIG_QUOTA
600 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
601                                     size_t, loff_t);
602 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
603                                    loff_t);
604 #endif
605
606 static const struct super_operations reiserfs_sops = {
607         .alloc_inode = reiserfs_alloc_inode,
608         .destroy_inode = reiserfs_destroy_inode,
609         .write_inode = reiserfs_write_inode,
610         .dirty_inode = reiserfs_dirty_inode,
611         .clear_inode = reiserfs_clear_inode,
612         .delete_inode = reiserfs_delete_inode,
613         .put_super = reiserfs_put_super,
614         .write_super = reiserfs_write_super,
615         .sync_fs = reiserfs_sync_fs,
616         .freeze_fs = reiserfs_freeze,
617         .unfreeze_fs = reiserfs_unfreeze,
618         .statfs = reiserfs_statfs,
619         .remount_fs = reiserfs_remount,
620         .show_options = generic_show_options,
621 #ifdef CONFIG_QUOTA
622         .quota_read = reiserfs_quota_read,
623         .quota_write = reiserfs_quota_write,
624 #endif
625 };
626
627 #ifdef CONFIG_QUOTA
628 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
629
630 static int reiserfs_write_dquot(struct dquot *);
631 static int reiserfs_acquire_dquot(struct dquot *);
632 static int reiserfs_release_dquot(struct dquot *);
633 static int reiserfs_mark_dquot_dirty(struct dquot *);
634 static int reiserfs_write_info(struct super_block *, int);
635 static int reiserfs_quota_on(struct super_block *, int, int, char *);
636
637 static const struct dquot_operations reiserfs_quota_operations = {
638         .write_dquot = reiserfs_write_dquot,
639         .acquire_dquot = reiserfs_acquire_dquot,
640         .release_dquot = reiserfs_release_dquot,
641         .mark_dirty = reiserfs_mark_dquot_dirty,
642         .write_info = reiserfs_write_info,
643         .alloc_dquot    = dquot_alloc,
644         .destroy_dquot  = dquot_destroy,
645 };
646
647 static const struct quotactl_ops reiserfs_qctl_operations = {
648         .quota_on = reiserfs_quota_on,
649         .quota_off = dquot_quota_off,
650         .quota_sync = dquot_quota_sync,
651         .get_info = dquot_get_dqinfo,
652         .set_info = dquot_set_dqinfo,
653         .get_dqblk = dquot_get_dqblk,
654         .set_dqblk = dquot_set_dqblk,
655 };
656 #endif
657
658 static const struct export_operations reiserfs_export_ops = {
659         .encode_fh = reiserfs_encode_fh,
660         .fh_to_dentry = reiserfs_fh_to_dentry,
661         .fh_to_parent = reiserfs_fh_to_parent,
662         .get_parent = reiserfs_get_parent,
663 };
664
665 /* this struct is used in reiserfs_getopt () for containing the value for those
666    mount options that have values rather than being toggles. */
667 typedef struct {
668         char *value;
669         int setmask;            /* bitmask which is to set on mount_options bitmask when this
670                                    value is found, 0 is no bits are to be changed. */
671         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
672                                    value is found, 0 is no bits are to be changed. This is
673                                    applied BEFORE setmask */
674 } arg_desc_t;
675
676 /* Set this bit in arg_required to allow empty arguments */
677 #define REISERFS_OPT_ALLOWEMPTY 31
678
679 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
680    mount options */
681 typedef struct {
682         char *option_name;
683         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
684         const arg_desc_t *values;       /* list of values accepted by an option */
685         int setmask;            /* bitmask which is to set on mount_options bitmask when this
686                                    value is found, 0 is no bits are to be changed. */
687         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
688                                    value is found, 0 is no bits are to be changed. This is
689                                    applied BEFORE setmask */
690 } opt_desc_t;
691
692 /* possible values for -o data= */
693 static const arg_desc_t logging_mode[] = {
694         {"ordered", 1 << REISERFS_DATA_ORDERED,
695          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
696         {"journal", 1 << REISERFS_DATA_LOG,
697          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
698         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
699          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
700         {.value = NULL}
701 };
702
703 /* possible values for -o barrier= */
704 static const arg_desc_t barrier_mode[] = {
705         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
706         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
707         {.value = NULL}
708 };
709
710 /* possible values for "-o block-allocator=" and bits which are to be set in
711    s_mount_opt of reiserfs specific part of in-core super block */
712 static const arg_desc_t balloc[] = {
713         {"noborder", 1 << REISERFS_NO_BORDER, 0},
714         {"border", 0, 1 << REISERFS_NO_BORDER},
715         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
716         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
717         {"test4", 1 << REISERFS_TEST4, 0},
718         {"notest4", 0, 1 << REISERFS_TEST4},
719         {NULL, 0, 0}
720 };
721
722 static const arg_desc_t tails[] = {
723         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
724         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
725         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
726         {NULL, 0, 0}
727 };
728
729 static const arg_desc_t error_actions[] = {
730         {"panic", 1 << REISERFS_ERROR_PANIC,
731          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
732         {"ro-remount", 1 << REISERFS_ERROR_RO,
733          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
734 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
735         {"continue", 1 << REISERFS_ERROR_CONTINUE,
736          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
737 #endif
738         {NULL, 0, 0},
739 };
740
741 /* proceed only one option from a list *cur - string containing of mount options
742    opts - array of options which are accepted
743    opt_arg - if option is found and requires an argument and if it is specifed
744    in the input - pointer to the argument is stored here
745    bit_flags - if option requires to set a certain bit - it is set here
746    return -1 if unknown option is found, opt->arg_required otherwise */
747 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
748                            char **opt_arg, unsigned long *bit_flags)
749 {
750         char *p;
751         /* foo=bar,
752            ^   ^  ^
753            |   |  +-- option_end
754            |   +-- arg_start
755            +-- option_start
756          */
757         const opt_desc_t *opt;
758         const arg_desc_t *arg;
759
760         p = *cur;
761
762         /* assume argument cannot contain commas */
763         *cur = strchr(p, ',');
764         if (*cur) {
765                 *(*cur) = '\0';
766                 (*cur)++;
767         }
768
769         if (!strncmp(p, "alloc=", 6)) {
770                 /* Ugly special case, probably we should redo options parser so that
771                    it can understand several arguments for some options, also so that
772                    it can fill several bitfields with option values. */
773                 if (reiserfs_parse_alloc_options(s, p + 6)) {
774                         return -1;
775                 } else {
776                         return 0;
777                 }
778         }
779
780         /* for every option in the list */
781         for (opt = opts; opt->option_name; opt++) {
782                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
783                         if (bit_flags) {
784                                 if (opt->clrmask ==
785                                     (1 << REISERFS_UNSUPPORTED_OPT))
786                                         reiserfs_warning(s, "super-6500",
787                                                          "%s not supported.\n",
788                                                          p);
789                                 else
790                                         *bit_flags &= ~opt->clrmask;
791                                 if (opt->setmask ==
792                                     (1 << REISERFS_UNSUPPORTED_OPT))
793                                         reiserfs_warning(s, "super-6501",
794                                                          "%s not supported.\n",
795                                                          p);
796                                 else
797                                         *bit_flags |= opt->setmask;
798                         }
799                         break;
800                 }
801         }
802         if (!opt->option_name) {
803                 reiserfs_warning(s, "super-6502",
804                                  "unknown mount option \"%s\"", p);
805                 return -1;
806         }
807
808         p += strlen(opt->option_name);
809         switch (*p) {
810         case '=':
811                 if (!opt->arg_required) {
812                         reiserfs_warning(s, "super-6503",
813                                          "the option \"%s\" does not "
814                                          "require an argument\n",
815                                          opt->option_name);
816                         return -1;
817                 }
818                 break;
819
820         case 0:
821                 if (opt->arg_required) {
822                         reiserfs_warning(s, "super-6504",
823                                          "the option \"%s\" requires an "
824                                          "argument\n", opt->option_name);
825                         return -1;
826                 }
827                 break;
828         default:
829                 reiserfs_warning(s, "super-6505",
830                                  "head of option \"%s\" is only correct\n",
831                                  opt->option_name);
832                 return -1;
833         }
834
835         /* move to the argument, or to next option if argument is not required */
836         p++;
837
838         if (opt->arg_required
839             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
840             && !strlen(p)) {
841                 /* this catches "option=," if not allowed */
842                 reiserfs_warning(s, "super-6506",
843                                  "empty argument for \"%s\"\n",
844                                  opt->option_name);
845                 return -1;
846         }
847
848         if (!opt->values) {
849                 /* *=NULLopt_arg contains pointer to argument */
850                 *opt_arg = p;
851                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
852         }
853
854         /* values possible for this option are listed in opt->values */
855         for (arg = opt->values; arg->value; arg++) {
856                 if (!strcmp(p, arg->value)) {
857                         if (bit_flags) {
858                                 *bit_flags &= ~arg->clrmask;
859                                 *bit_flags |= arg->setmask;
860                         }
861                         return opt->arg_required;
862                 }
863         }
864
865         reiserfs_warning(s, "super-6506",
866                          "bad value \"%s\" for option \"%s\"\n", p,
867                          opt->option_name);
868         return -1;
869 }
870
871 /* returns 0 if something is wrong in option string, 1 - otherwise */
872 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
873                                   unsigned long *mount_options,
874                                   /* after the parsing phase, contains the
875                                      collection of bitflags defining what
876                                      mount options were selected. */
877                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
878                                   char **jdev_name,
879                                   unsigned int *commit_max_age,
880                                   char **qf_names,
881                                   unsigned int *qfmt)
882 {
883         int c;
884         char *arg = NULL;
885         char *pos;
886         opt_desc_t opts[] = {
887                 /* Compatibility stuff, so that -o notail for old setups still work */
888                 {"tails",.arg_required = 't',.values = tails},
889                 {"notail",.clrmask =
890                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
891                 {"conv",.setmask = 1 << REISERFS_CONVERT},
892                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
893                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
894                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
895 #ifdef CONFIG_REISERFS_FS_XATTR
896                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
897                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
898 #else
899                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
900                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
901 #endif
902 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
903                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
904                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
905 #else
906                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
907                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
908 #endif
909                 {.option_name = "nolog"},
910                 {"replayonly",.setmask = 1 << REPLAYONLY},
911                 {"block-allocator",.arg_required = 'a',.values = balloc},
912                 {"data",.arg_required = 'd',.values = logging_mode},
913                 {"barrier",.arg_required = 'b',.values = barrier_mode},
914                 {"resize",.arg_required = 'r',.values = NULL},
915                 {"jdev",.arg_required = 'j',.values = NULL},
916                 {"nolargeio",.arg_required = 'w',.values = NULL},
917                 {"commit",.arg_required = 'c',.values = NULL},
918                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
919                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
920                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
921                 {"errors",.arg_required = 'e',.values = error_actions},
922                 {"usrjquota",.arg_required =
923                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
924                 {"grpjquota",.arg_required =
925                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
926                 {"jqfmt",.arg_required = 'f',.values = NULL},
927                 {.option_name = NULL}
928         };
929
930         *blocks = 0;
931         if (!options || !*options)
932                 /* use default configuration: create tails, journaling on, no
933                    conversion to newest format */
934                 return 1;
935
936         for (pos = options; pos;) {
937                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
938                 if (c == -1)
939                         /* wrong option is given */
940                         return 0;
941
942                 if (c == 'r') {
943                         char *p;
944
945                         p = NULL;
946                         /* "resize=NNN" or "resize=auto" */
947
948                         if (!strcmp(arg, "auto")) {
949                                 /* From JFS code, to auto-get the size. */
950                                 *blocks =
951                                     s->s_bdev->bd_inode->i_size >> s->
952                                     s_blocksize_bits;
953                         } else {
954                                 *blocks = simple_strtoul(arg, &p, 0);
955                                 if (*p != '\0') {
956                                         /* NNN does not look like a number */
957                                         reiserfs_warning(s, "super-6507",
958                                                          "bad value %s for "
959                                                          "-oresize\n", arg);
960                                         return 0;
961                                 }
962                         }
963                 }
964
965                 if (c == 'c') {
966                         char *p = NULL;
967                         unsigned long val = simple_strtoul(arg, &p, 0);
968                         /* commit=NNN (time in seconds) */
969                         if (*p != '\0' || val >= (unsigned int)-1) {
970                                 reiserfs_warning(s, "super-6508",
971                                                  "bad value %s for -ocommit\n",
972                                                  arg);
973                                 return 0;
974                         }
975                         *commit_max_age = (unsigned int)val;
976                 }
977
978                 if (c == 'w') {
979                         reiserfs_warning(s, "super-6509", "nolargeio option "
980                                          "is no longer supported");
981                         return 0;
982                 }
983
984                 if (c == 'j') {
985                         if (arg && *arg && jdev_name) {
986                                 if (*jdev_name) {       //Hm, already assigned?
987                                         reiserfs_warning(s, "super-6510",
988                                                          "journal device was "
989                                                          "already specified to "
990                                                          "be %s", *jdev_name);
991                                         return 0;
992                                 }
993                                 *jdev_name = arg;
994                         }
995                 }
996 #ifdef CONFIG_QUOTA
997                 if (c == 'u' || c == 'g') {
998                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
999
1000                         if (sb_any_quota_loaded(s) &&
1001                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1002                                 reiserfs_warning(s, "super-6511",
1003                                                  "cannot change journaled "
1004                                                  "quota options when quota "
1005                                                  "turned on.");
1006                                 return 0;
1007                         }
1008                         if (*arg) {     /* Some filename specified? */
1009                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1010                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1011                                               arg)) {
1012                                         reiserfs_warning(s, "super-6512",
1013                                                          "%s quota file "
1014                                                          "already specified.",
1015                                                          QTYPE2NAME(qtype));
1016                                         return 0;
1017                                 }
1018                                 if (strchr(arg, '/')) {
1019                                         reiserfs_warning(s, "super-6513",
1020                                                          "quotafile must be "
1021                                                          "on filesystem root.");
1022                                         return 0;
1023                                 }
1024                                 qf_names[qtype] =
1025                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1026                                 if (!qf_names[qtype]) {
1027                                         reiserfs_warning(s, "reiserfs-2502",
1028                                                          "not enough memory "
1029                                                          "for storing "
1030                                                          "quotafile name.");
1031                                         return 0;
1032                                 }
1033                                 strcpy(qf_names[qtype], arg);
1034                                 *mount_options |= 1 << REISERFS_QUOTA;
1035                         } else {
1036                                 if (qf_names[qtype] !=
1037                                     REISERFS_SB(s)->s_qf_names[qtype])
1038                                         kfree(qf_names[qtype]);
1039                                 qf_names[qtype] = NULL;
1040                         }
1041                 }
1042                 if (c == 'f') {
1043                         if (!strcmp(arg, "vfsold"))
1044                                 *qfmt = QFMT_VFS_OLD;
1045                         else if (!strcmp(arg, "vfsv0"))
1046                                 *qfmt = QFMT_VFS_V0;
1047                         else {
1048                                 reiserfs_warning(s, "super-6514",
1049                                                  "unknown quota format "
1050                                                  "specified.");
1051                                 return 0;
1052                         }
1053                         if (sb_any_quota_loaded(s) &&
1054                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1055                                 reiserfs_warning(s, "super-6515",
1056                                                  "cannot change journaled "
1057                                                  "quota options when quota "
1058                                                  "turned on.");
1059                                 return 0;
1060                         }
1061                 }
1062 #else
1063                 if (c == 'u' || c == 'g' || c == 'f') {
1064                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1065                                          "quota options not supported.");
1066                         return 0;
1067                 }
1068 #endif
1069         }
1070
1071 #ifdef CONFIG_QUOTA
1072         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1073             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1074                 reiserfs_warning(s, "super-6515",
1075                                  "journaled quota format not specified.");
1076                 return 0;
1077         }
1078         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1079         if (!(*mount_options & (1 << REISERFS_QUOTA))
1080             && sb_any_quota_loaded(s)) {
1081                 reiserfs_warning(s, "super-6516", "quota options must "
1082                                  "be present when quota is turned on.");
1083                 return 0;
1084         }
1085 #endif
1086
1087         return 1;
1088 }
1089
1090 static void switch_data_mode(struct super_block *s, unsigned long mode)
1091 {
1092         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1093                                          (1 << REISERFS_DATA_ORDERED) |
1094                                          (1 << REISERFS_DATA_WRITEBACK));
1095         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1096 }
1097
1098 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1099 {
1100         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1101                 if (!reiserfs_data_log(s)) {
1102                         switch_data_mode(s, REISERFS_DATA_LOG);
1103                         reiserfs_info(s, "switching to journaled data mode\n");
1104                 }
1105         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1106                 if (!reiserfs_data_ordered(s)) {
1107                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1108                         reiserfs_info(s, "switching to ordered data mode\n");
1109                 }
1110         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1111                 if (!reiserfs_data_writeback(s)) {
1112                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1113                         reiserfs_info(s, "switching to writeback data mode\n");
1114                 }
1115         }
1116 }
1117
1118 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1119 {
1120         int flush = (1 << REISERFS_BARRIER_FLUSH);
1121         int none = (1 << REISERFS_BARRIER_NONE);
1122         int all_barrier = flush | none;
1123
1124         if (bits & all_barrier) {
1125                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1126                 if (bits & flush) {
1127                         REISERFS_SB(s)->s_mount_opt |= flush;
1128                         printk("reiserfs: enabling write barrier flush mode\n");
1129                 } else if (bits & none) {
1130                         REISERFS_SB(s)->s_mount_opt |= none;
1131                         printk("reiserfs: write barriers turned off\n");
1132                 }
1133         }
1134 }
1135
1136 static void handle_attrs(struct super_block *s)
1137 {
1138         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1139
1140         if (reiserfs_attrs(s)) {
1141                 if (old_format_only(s)) {
1142                         reiserfs_warning(s, "super-6517", "cannot support "
1143                                          "attributes on 3.5.x disk format");
1144                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1145                         return;
1146                 }
1147                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1148                         reiserfs_warning(s, "super-6518", "cannot support "
1149                                          "attributes until flag is set in "
1150                                          "super-block");
1151                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1152                 }
1153         }
1154 }
1155
1156 #ifdef CONFIG_QUOTA
1157 static void handle_quota_files(struct super_block *s, char **qf_names,
1158                                unsigned int *qfmt)
1159 {
1160         int i;
1161
1162         for (i = 0; i < MAXQUOTAS; i++) {
1163                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1164                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1165                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1166         }
1167         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1168 }
1169 #endif
1170
1171 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1172 {
1173         struct reiserfs_super_block *rs;
1174         struct reiserfs_transaction_handle th;
1175         unsigned long blocks;
1176         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1177         unsigned long safe_mask = 0;
1178         unsigned int commit_max_age = (unsigned int)-1;
1179         struct reiserfs_journal *journal = SB_JOURNAL(s);
1180         char *new_opts = kstrdup(arg, GFP_KERNEL);
1181         int err;
1182         char *qf_names[MAXQUOTAS];
1183         unsigned int qfmt = 0;
1184 #ifdef CONFIG_QUOTA
1185         int i;
1186 #endif
1187
1188         reiserfs_write_lock(s);
1189
1190 #ifdef CONFIG_QUOTA
1191         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1192 #endif
1193
1194         rs = SB_DISK_SUPER_BLOCK(s);
1195
1196         if (!reiserfs_parse_options
1197             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1198             qf_names, &qfmt)) {
1199 #ifdef CONFIG_QUOTA
1200                 for (i = 0; i < MAXQUOTAS; i++)
1201                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1202                                 kfree(qf_names[i]);
1203 #endif
1204                 err = -EINVAL;
1205                 goto out_err;
1206         }
1207 #ifdef CONFIG_QUOTA
1208         handle_quota_files(s, qf_names, &qfmt);
1209 #endif
1210
1211         handle_attrs(s);
1212
1213         /* Add options that are safe here */
1214         safe_mask |= 1 << REISERFS_SMALLTAIL;
1215         safe_mask |= 1 << REISERFS_LARGETAIL;
1216         safe_mask |= 1 << REISERFS_NO_BORDER;
1217         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1218         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1219         safe_mask |= 1 << REISERFS_TEST4;
1220         safe_mask |= 1 << REISERFS_ATTRS;
1221         safe_mask |= 1 << REISERFS_XATTRS_USER;
1222         safe_mask |= 1 << REISERFS_POSIXACL;
1223         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1224         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1225         safe_mask |= 1 << REISERFS_ERROR_RO;
1226         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1227         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1228         safe_mask |= 1 << REISERFS_QUOTA;
1229
1230         /* Update the bitmask, taking care to keep
1231          * the bits we're not allowed to change here */
1232         REISERFS_SB(s)->s_mount_opt =
1233             (REISERFS_SB(s)->
1234              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1235
1236         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1237                 journal->j_max_commit_age = commit_max_age;
1238                 journal->j_max_trans_age = commit_max_age;
1239         } else if (commit_max_age == 0) {
1240                 /* 0 means restore defaults. */
1241                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1242                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1243         }
1244
1245         if (blocks) {
1246                 err = reiserfs_resize(s, blocks);
1247                 if (err != 0)
1248                         goto out_err;
1249         }
1250
1251         if (*mount_flags & MS_RDONLY) {
1252                 reiserfs_xattr_init(s, *mount_flags);
1253                 /* remount read-only */
1254                 if (s->s_flags & MS_RDONLY)
1255                         /* it is read-only already */
1256                         goto out_ok;
1257
1258                 err = dquot_suspend(s, -1);
1259                 if (err < 0)
1260                         goto out_err;
1261
1262                 /* try to remount file system with read-only permissions */
1263                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1264                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1265                         goto out_ok;
1266                 }
1267
1268                 err = journal_begin(&th, s, 10);
1269                 if (err)
1270                         goto out_err;
1271
1272                 /* Mounting a rw partition read-only. */
1273                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1274                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1275                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1276         } else {
1277                 /* remount read-write */
1278                 if (!(s->s_flags & MS_RDONLY)) {
1279                         reiserfs_xattr_init(s, *mount_flags);
1280                         goto out_ok;    /* We are read-write already */
1281                 }
1282
1283                 if (reiserfs_is_journal_aborted(journal)) {
1284                         err = journal->j_errno;
1285                         goto out_err;
1286                 }
1287
1288                 handle_data_mode(s, mount_options);
1289                 handle_barrier_mode(s, mount_options);
1290                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1291                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1292                 err = journal_begin(&th, s, 10);
1293                 if (err)
1294                         goto out_err;
1295
1296                 /* Mount a partition which is read-only, read-write */
1297                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1298                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1299                 s->s_flags &= ~MS_RDONLY;
1300                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1301                 if (!old_format_only(s))
1302                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1303                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1304                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1305                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1306         }
1307         /* this will force a full flush of all journal lists */
1308         SB_JOURNAL(s)->j_must_wait = 1;
1309         err = journal_end(&th, s, 10);
1310         if (err)
1311                 goto out_err;
1312         s->s_dirt = 0;
1313
1314         if (!(*mount_flags & MS_RDONLY)) {
1315                 dquot_resume(s, -1);
1316                 finish_unfinished(s);
1317                 reiserfs_xattr_init(s, *mount_flags);
1318         }
1319
1320 out_ok:
1321         replace_mount_options(s, new_opts);
1322         reiserfs_write_unlock(s);
1323         return 0;
1324
1325 out_err:
1326         kfree(new_opts);
1327         reiserfs_write_unlock(s);
1328         return err;
1329 }
1330
1331 static int read_super_block(struct super_block *s, int offset)
1332 {
1333         struct buffer_head *bh;
1334         struct reiserfs_super_block *rs;
1335         int fs_blocksize;
1336
1337         bh = sb_bread(s, offset / s->s_blocksize);
1338         if (!bh) {
1339                 reiserfs_warning(s, "sh-2006",
1340                                  "bread failed (dev %s, block %lu, size %lu)",
1341                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1342                                  s->s_blocksize);
1343                 return 1;
1344         }
1345
1346         rs = (struct reiserfs_super_block *)bh->b_data;
1347         if (!is_any_reiserfs_magic_string(rs)) {
1348                 brelse(bh);
1349                 return 1;
1350         }
1351         //
1352         // ok, reiserfs signature (old or new) found in at the given offset
1353         //
1354         fs_blocksize = sb_blocksize(rs);
1355         brelse(bh);
1356         sb_set_blocksize(s, fs_blocksize);
1357
1358         bh = sb_bread(s, offset / s->s_blocksize);
1359         if (!bh) {
1360                 reiserfs_warning(s, "sh-2007",
1361                                  "bread failed (dev %s, block %lu, size %lu)",
1362                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1363                                  s->s_blocksize);
1364                 return 1;
1365         }
1366
1367         rs = (struct reiserfs_super_block *)bh->b_data;
1368         if (sb_blocksize(rs) != s->s_blocksize) {
1369                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1370                                  "filesystem on (dev %s, block %Lu, size %lu)",
1371                                  reiserfs_bdevname(s),
1372                                  (unsigned long long)bh->b_blocknr,
1373                                  s->s_blocksize);
1374                 brelse(bh);
1375                 return 1;
1376         }
1377
1378         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1379                 brelse(bh);
1380                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1381                                  "--rebuild-tree run detected. Please run\n"
1382                                  "reiserfsck --rebuild-tree and wait for a "
1383                                  "completion. If that fails\n"
1384                                  "get newer reiserfsprogs package");
1385                 return 1;
1386         }
1387
1388         SB_BUFFER_WITH_SB(s) = bh;
1389         SB_DISK_SUPER_BLOCK(s) = rs;
1390
1391         if (is_reiserfs_jr(rs)) {
1392                 /* magic is of non-standard journal filesystem, look at s_version to
1393                    find which format is in use */
1394                 if (sb_version(rs) == REISERFS_VERSION_2)
1395                         reiserfs_info(s, "found reiserfs format \"3.6\""
1396                                       " with non-standard journal\n");
1397                 else if (sb_version(rs) == REISERFS_VERSION_1)
1398                         reiserfs_info(s, "found reiserfs format \"3.5\""
1399                                       " with non-standard journal\n");
1400                 else {
1401                         reiserfs_warning(s, "sh-2012", "found unknown "
1402                                          "format \"%u\" of reiserfs with "
1403                                          "non-standard magic", sb_version(rs));
1404                         return 1;
1405                 }
1406         } else
1407                 /* s_version of standard format may contain incorrect information,
1408                    so we just look at the magic string */
1409                 reiserfs_info(s,
1410                               "found reiserfs format \"%s\" with standard journal\n",
1411                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1412
1413         s->s_op = &reiserfs_sops;
1414         s->s_export_op = &reiserfs_export_ops;
1415 #ifdef CONFIG_QUOTA
1416         s->s_qcop = &reiserfs_qctl_operations;
1417         s->dq_op = &reiserfs_quota_operations;
1418 #endif
1419
1420         /* new format is limited by the 32 bit wide i_blocks field, want to
1421          ** be one full block below that.
1422          */
1423         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1424         return 0;
1425 }
1426
1427 /* after journal replay, reread all bitmap and super blocks */
1428 static int reread_meta_blocks(struct super_block *s)
1429 {
1430         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1431         reiserfs_write_unlock(s);
1432         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1433         reiserfs_write_lock(s);
1434         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1435                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1436                 return 1;
1437         }
1438
1439         return 0;
1440 }
1441
1442 /////////////////////////////////////////////////////
1443 // hash detection stuff
1444
1445 // if root directory is empty - we set default - Yura's - hash and
1446 // warn about it
1447 // FIXME: we look for only one name in a directory. If tea and yura
1448 // bith have the same value - we ask user to send report to the
1449 // mailing list
1450 static __u32 find_hash_out(struct super_block *s)
1451 {
1452         int retval;
1453         struct inode *inode;
1454         struct cpu_key key;
1455         INITIALIZE_PATH(path);
1456         struct reiserfs_dir_entry de;
1457         __u32 hash = DEFAULT_HASH;
1458
1459         inode = s->s_root->d_inode;
1460
1461         do {                    // Some serious "goto"-hater was there ;)
1462                 u32 teahash, r5hash, yurahash;
1463
1464                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1465                 retval = search_by_entry_key(s, &key, &path, &de);
1466                 if (retval == IO_ERROR) {
1467                         pathrelse(&path);
1468                         return UNSET_HASH;
1469                 }
1470                 if (retval == NAME_NOT_FOUND)
1471                         de.de_entry_num--;
1472                 set_de_name_and_namelen(&de);
1473                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1474                         /* allow override in this case */
1475                         if (reiserfs_rupasov_hash(s)) {
1476                                 hash = YURA_HASH;
1477                         }
1478                         reiserfs_info(s, "FS seems to be empty, autodetect "
1479                                          "is using the default hash\n");
1480                         break;
1481                 }
1482                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1483                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1484                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1485                 if (((teahash == r5hash)
1486                      &&
1487                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1488                       == r5hash)) || ((teahash == yurahash)
1489                                       && (yurahash ==
1490                                           GET_HASH_VALUE(deh_offset
1491                                                          (&
1492                                                           (de.
1493                                                            de_deh[de.
1494                                                                   de_entry_num])))))
1495                     || ((r5hash == yurahash)
1496                         && (yurahash ==
1497                             GET_HASH_VALUE(deh_offset
1498                                            (&(de.de_deh[de.de_entry_num])))))) {
1499                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1500                                          "automatically detect hash function. "
1501                                          "Please mount with -o "
1502                                          "hash={tea,rupasov,r5}");
1503                         hash = UNSET_HASH;
1504                         break;
1505                 }
1506                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1507                     yurahash)
1508                         hash = YURA_HASH;
1509                 else if (GET_HASH_VALUE
1510                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1511                         hash = TEA_HASH;
1512                 else if (GET_HASH_VALUE
1513                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1514                         hash = R5_HASH;
1515                 else {
1516                         reiserfs_warning(s, "reiserfs-2506",
1517                                          "Unrecognised hash function");
1518                         hash = UNSET_HASH;
1519                 }
1520         } while (0);
1521
1522         pathrelse(&path);
1523         return hash;
1524 }
1525
1526 // finds out which hash names are sorted with
1527 static int what_hash(struct super_block *s)
1528 {
1529         __u32 code;
1530
1531         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1532
1533         /* reiserfs_hash_detect() == true if any of the hash mount options
1534          ** were used.  We must check them to make sure the user isn't
1535          ** using a bad hash value
1536          */
1537         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1538                 code = find_hash_out(s);
1539
1540         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1541                 /* detection has found the hash, and we must check against the
1542                  ** mount options
1543                  */
1544                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1545                         reiserfs_warning(s, "reiserfs-2507",
1546                                          "Error, %s hash detected, "
1547                                          "unable to force rupasov hash",
1548                                          reiserfs_hashname(code));
1549                         code = UNSET_HASH;
1550                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1551                         reiserfs_warning(s, "reiserfs-2508",
1552                                          "Error, %s hash detected, "
1553                                          "unable to force tea hash",
1554                                          reiserfs_hashname(code));
1555                         code = UNSET_HASH;
1556                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1557                         reiserfs_warning(s, "reiserfs-2509",
1558                                          "Error, %s hash detected, "
1559                                          "unable to force r5 hash",
1560                                          reiserfs_hashname(code));
1561                         code = UNSET_HASH;
1562                 }
1563         } else {
1564                 /* find_hash_out was not called or could not determine the hash */
1565                 if (reiserfs_rupasov_hash(s)) {
1566                         code = YURA_HASH;
1567                 } else if (reiserfs_tea_hash(s)) {
1568                         code = TEA_HASH;
1569                 } else if (reiserfs_r5_hash(s)) {
1570                         code = R5_HASH;
1571                 }
1572         }
1573
1574         /* if we are mounted RW, and we have a new valid hash code, update
1575          ** the super
1576          */
1577         if (code != UNSET_HASH &&
1578             !(s->s_flags & MS_RDONLY) &&
1579             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1580                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1581         }
1582         return code;
1583 }
1584
1585 // return pointer to appropriate function
1586 static hashf_t hash_function(struct super_block *s)
1587 {
1588         switch (what_hash(s)) {
1589         case TEA_HASH:
1590                 reiserfs_info(s, "Using tea hash to sort names\n");
1591                 return keyed_hash;
1592         case YURA_HASH:
1593                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1594                 return yura_hash;
1595         case R5_HASH:
1596                 reiserfs_info(s, "Using r5 hash to sort names\n");
1597                 return r5_hash;
1598         }
1599         return NULL;
1600 }
1601
1602 // this is used to set up correct value for old partitions
1603 static int function2code(hashf_t func)
1604 {
1605         if (func == keyed_hash)
1606                 return TEA_HASH;
1607         if (func == yura_hash)
1608                 return YURA_HASH;
1609         if (func == r5_hash)
1610                 return R5_HASH;
1611
1612         BUG();                  // should never happen
1613
1614         return 0;
1615 }
1616
1617 #define SWARN(silent, s, id, ...)                       \
1618         if (!(silent))                          \
1619                 reiserfs_warning(s, id, __VA_ARGS__)
1620
1621 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1622 {
1623         struct inode *root_inode;
1624         struct reiserfs_transaction_handle th;
1625         int old_format = 0;
1626         unsigned long blocks;
1627         unsigned int commit_max_age = 0;
1628         int jinit_done = 0;
1629         struct reiserfs_iget_args args;
1630         struct reiserfs_super_block *rs;
1631         char *jdev_name;
1632         struct reiserfs_sb_info *sbi;
1633         int errval = -EINVAL;
1634         char *qf_names[MAXQUOTAS] = {};
1635         unsigned int qfmt = 0;
1636
1637         save_mount_options(s, data);
1638
1639         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1640         if (!sbi)
1641                 return -ENOMEM;
1642         s->s_fs_info = sbi;
1643         /* Set default values for options: non-aggressive tails, RO on errors */
1644         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1645         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1646         /* no preallocation minimum, be smart in
1647            reiserfs_file_write instead */
1648         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1649         /* Preallocate by 16 blocks (17-1) at once */
1650         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1651         /* setup default block allocator options */
1652         reiserfs_init_alloc_options(s);
1653
1654         mutex_init(&REISERFS_SB(s)->lock);
1655         REISERFS_SB(s)->lock_depth = -1;
1656
1657         /*
1658          * This function is called with the bkl, which also was the old
1659          * locking used here.
1660          * do_journal_begin() will soon check if we hold the lock (ie: was the
1661          * bkl). This is likely because do_journal_begin() has several another
1662          * callers because at this time, it doesn't seem to be necessary to
1663          * protect against anything.
1664          * Anyway, let's be conservative and lock for now.
1665          */
1666         reiserfs_write_lock(s);
1667
1668         jdev_name = NULL;
1669         if (reiserfs_parse_options
1670             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1671              &commit_max_age, qf_names, &qfmt) == 0) {
1672                 goto error;
1673         }
1674 #ifdef CONFIG_QUOTA
1675         handle_quota_files(s, qf_names, &qfmt);
1676 #endif
1677
1678         if (blocks) {
1679                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1680                 goto error;
1681         }
1682
1683         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1684         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1685                 old_format = 1;
1686         /* try new format (64-th 1k block), which can contain reiserfs super block */
1687         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1688                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1689                       reiserfs_bdevname(s));
1690                 goto error;
1691         }
1692
1693         rs = SB_DISK_SUPER_BLOCK(s);
1694         /* Let's do basic sanity check to verify that underlying device is not
1695            smaller than the filesystem. If the check fails then abort and scream,
1696            because bad stuff will happen otherwise. */
1697         if (s->s_bdev && s->s_bdev->bd_inode
1698             && i_size_read(s->s_bdev->bd_inode) <
1699             sb_block_count(rs) * sb_blocksize(rs)) {
1700                 SWARN(silent, s, "", "Filesystem cannot be "
1701                       "mounted because it is bigger than the device");
1702                 SWARN(silent, s, "", "You may need to run fsck "
1703                       "or increase size of your LVM partition");
1704                 SWARN(silent, s, "", "Or may be you forgot to "
1705                       "reboot after fdisk when it told you to");
1706                 goto error;
1707         }
1708
1709         sbi->s_mount_state = SB_REISERFS_STATE(s);
1710         sbi->s_mount_state = REISERFS_VALID_FS;
1711
1712         if ((errval = reiserfs_init_bitmap_cache(s))) {
1713                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1714                 goto error;
1715         }
1716         errval = -EINVAL;
1717 #ifdef CONFIG_REISERFS_CHECK
1718         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1719         SWARN(silent, s, "", "- it is slow mode for debugging.");
1720 #endif
1721
1722         /* make data=ordered the default */
1723         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1724             !reiserfs_data_writeback(s)) {
1725                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1726         }
1727
1728         if (reiserfs_data_log(s)) {
1729                 reiserfs_info(s, "using journaled data mode\n");
1730         } else if (reiserfs_data_ordered(s)) {
1731                 reiserfs_info(s, "using ordered data mode\n");
1732         } else {
1733                 reiserfs_info(s, "using writeback data mode\n");
1734         }
1735         if (reiserfs_barrier_flush(s)) {
1736                 printk("reiserfs: using flush barriers\n");
1737         }
1738         // set_device_ro(s->s_dev, 1) ;
1739         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1740                 SWARN(silent, s, "sh-2022",
1741                       "unable to initialize journal space");
1742                 goto error;
1743         } else {
1744                 jinit_done = 1; /* once this is set, journal_release must be called
1745                                  ** if we error out of the mount
1746                                  */
1747         }
1748         if (reread_meta_blocks(s)) {
1749                 SWARN(silent, s, "jmacd-9",
1750                       "unable to reread meta blocks after journal init");
1751                 goto error;
1752         }
1753
1754         if (replay_only(s))
1755                 goto error;
1756
1757         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1758                 SWARN(silent, s, "clm-7000",
1759                       "Detected readonly device, marking FS readonly");
1760                 s->s_flags |= MS_RDONLY;
1761         }
1762         args.objectid = REISERFS_ROOT_OBJECTID;
1763         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1764         root_inode =
1765             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1766                          reiserfs_init_locked_inode, (void *)(&args));
1767         if (!root_inode) {
1768                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1769                 goto error;
1770         }
1771
1772         if (root_inode->i_state & I_NEW) {
1773                 reiserfs_read_locked_inode(root_inode, &args);
1774                 unlock_new_inode(root_inode);
1775         }
1776
1777         s->s_root = d_alloc_root(root_inode);
1778         if (!s->s_root) {
1779                 iput(root_inode);
1780                 goto error;
1781         }
1782         // define and initialize hash function
1783         sbi->s_hash_function = hash_function(s);
1784         if (sbi->s_hash_function == NULL) {
1785                 dput(s->s_root);
1786                 s->s_root = NULL;
1787                 goto error;
1788         }
1789
1790         if (is_reiserfs_3_5(rs)
1791             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1792                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1793         else if (old_format)
1794                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1795         else
1796                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1797
1798         if (!(s->s_flags & MS_RDONLY)) {
1799
1800                 errval = journal_begin(&th, s, 1);
1801                 if (errval) {
1802                         dput(s->s_root);
1803                         s->s_root = NULL;
1804                         goto error;
1805                 }
1806                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1807
1808                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1809                 set_sb_fs_state(rs, 0);
1810
1811                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1812                  * case, but older revisions can't. This will cause the
1813                  * file system to fail mount on those older implementations,
1814                  * avoiding corruption. -jeffm */
1815                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1816                     sb_bmap_nr(rs) != 0) {
1817                         reiserfs_warning(s, "super-2030", "This file system "
1818                                         "claims to use %u bitmap blocks in "
1819                                         "its super block, but requires %u. "
1820                                         "Clearing to zero.", sb_bmap_nr(rs),
1821                                         reiserfs_bmap_count(s));
1822
1823                         set_sb_bmap_nr(rs, 0);
1824                 }
1825
1826                 if (old_format_only(s)) {
1827                         /* filesystem of format 3.5 either with standard or non-standard
1828                            journal */
1829                         if (convert_reiserfs(s)) {
1830                                 /* and -o conv is given */
1831                                 if (!silent)
1832                                         reiserfs_info(s,
1833                                                       "converting 3.5 filesystem to the 3.6 format");
1834
1835                                 if (is_reiserfs_3_5(rs))
1836                                         /* put magic string of 3.6 format. 2.2 will not be able to
1837                                            mount this filesystem anymore */
1838                                         memcpy(rs->s_v1.s_magic,
1839                                                reiserfs_3_6_magic_string,
1840                                                sizeof
1841                                                (reiserfs_3_6_magic_string));
1842
1843                                 set_sb_version(rs, REISERFS_VERSION_2);
1844                                 reiserfs_convert_objectid_map_v1(s);
1845                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1846                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1847                         } else if (!silent) {
1848                                 reiserfs_info(s, "using 3.5.x disk format\n");
1849                         }
1850                 } else
1851                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1852
1853
1854                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1855                 errval = journal_end(&th, s, 1);
1856                 if (errval) {
1857                         dput(s->s_root);
1858                         s->s_root = NULL;
1859                         goto error;
1860                 }
1861
1862                 if ((errval = reiserfs_lookup_privroot(s)) ||
1863                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1864                         dput(s->s_root);
1865                         s->s_root = NULL;
1866                         goto error;
1867                 }
1868
1869                 /* look for files which were to be removed in previous session */
1870                 finish_unfinished(s);
1871         } else {
1872                 if (old_format_only(s) && !silent) {
1873                         reiserfs_info(s, "using 3.5.x disk format\n");
1874                 }
1875
1876                 if ((errval = reiserfs_lookup_privroot(s)) ||
1877                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1878                         dput(s->s_root);
1879                         s->s_root = NULL;
1880                         goto error;
1881                 }
1882         }
1883         // mark hash in super block: it could be unset. overwrite should be ok
1884         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1885
1886         handle_attrs(s);
1887
1888         reiserfs_proc_info_init(s);
1889
1890         init_waitqueue_head(&(sbi->s_wait));
1891         spin_lock_init(&sbi->bitmap_lock);
1892
1893         reiserfs_write_unlock(s);
1894
1895         return (0);
1896
1897 error:
1898         if (jinit_done) {       /* kill the commit thread, free journal ram */
1899                 journal_release_error(NULL, s);
1900         }
1901
1902         reiserfs_write_unlock(s);
1903
1904         reiserfs_free_bitmap_cache(s);
1905         if (SB_BUFFER_WITH_SB(s))
1906                 brelse(SB_BUFFER_WITH_SB(s));
1907 #ifdef CONFIG_QUOTA
1908         {
1909                 int j;
1910                 for (j = 0; j < MAXQUOTAS; j++)
1911                         kfree(qf_names[j]);
1912         }
1913 #endif
1914         kfree(sbi);
1915
1916         s->s_fs_info = NULL;
1917         return errval;
1918 }
1919
1920 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1921 {
1922         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1923
1924         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1925         buf->f_bfree = sb_free_blocks(rs);
1926         buf->f_bavail = buf->f_bfree;
1927         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1928         buf->f_bsize = dentry->d_sb->s_blocksize;
1929         /* changed to accommodate gcc folks. */
1930         buf->f_type = REISERFS_SUPER_MAGIC;
1931         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1932         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1933                                 sizeof(rs->s_uuid)/2);
1934
1935         return 0;
1936 }
1937
1938 #ifdef CONFIG_QUOTA
1939 static int reiserfs_write_dquot(struct dquot *dquot)
1940 {
1941         struct reiserfs_transaction_handle th;
1942         int ret, err;
1943
1944         reiserfs_write_lock(dquot->dq_sb);
1945         ret =
1946             journal_begin(&th, dquot->dq_sb,
1947                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1948         if (ret)
1949                 goto out;
1950         ret = dquot_commit(dquot);
1951         err =
1952             journal_end(&th, dquot->dq_sb,
1953                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1954         if (!ret && err)
1955                 ret = err;
1956       out:
1957         reiserfs_write_unlock(dquot->dq_sb);
1958         return ret;
1959 }
1960
1961 static int reiserfs_acquire_dquot(struct dquot *dquot)
1962 {
1963         struct reiserfs_transaction_handle th;
1964         int ret, err;
1965
1966         reiserfs_write_lock(dquot->dq_sb);
1967         ret =
1968             journal_begin(&th, dquot->dq_sb,
1969                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1970         if (ret)
1971                 goto out;
1972         ret = dquot_acquire(dquot);
1973         err =
1974             journal_end(&th, dquot->dq_sb,
1975                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1976         if (!ret && err)
1977                 ret = err;
1978       out:
1979         reiserfs_write_unlock(dquot->dq_sb);
1980         return ret;
1981 }
1982
1983 static int reiserfs_release_dquot(struct dquot *dquot)
1984 {
1985         struct reiserfs_transaction_handle th;
1986         int ret, err;
1987
1988         reiserfs_write_lock(dquot->dq_sb);
1989         ret =
1990             journal_begin(&th, dquot->dq_sb,
1991                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1992         if (ret) {
1993                 /* Release dquot anyway to avoid endless cycle in dqput() */
1994                 dquot_release(dquot);
1995                 goto out;
1996         }
1997         ret = dquot_release(dquot);
1998         err =
1999             journal_end(&th, dquot->dq_sb,
2000                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2001         if (!ret && err)
2002                 ret = err;
2003       out:
2004         reiserfs_write_unlock(dquot->dq_sb);
2005         return ret;
2006 }
2007
2008 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2009 {
2010         /* Are we journaling quotas? */
2011         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2012             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2013                 dquot_mark_dquot_dirty(dquot);
2014                 return reiserfs_write_dquot(dquot);
2015         } else
2016                 return dquot_mark_dquot_dirty(dquot);
2017 }
2018
2019 static int reiserfs_write_info(struct super_block *sb, int type)
2020 {
2021         struct reiserfs_transaction_handle th;
2022         int ret, err;
2023
2024         /* Data block + inode block */
2025         reiserfs_write_lock(sb);
2026         ret = journal_begin(&th, sb, 2);
2027         if (ret)
2028                 goto out;
2029         ret = dquot_commit_info(sb, type);
2030         err = journal_end(&th, sb, 2);
2031         if (!ret && err)
2032                 ret = err;
2033       out:
2034         reiserfs_write_unlock(sb);
2035         return ret;
2036 }
2037
2038 /*
2039  * Turn on quotas during mount time - we need to find the quota file and such...
2040  */
2041 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2042 {
2043         return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2044                                         REISERFS_SB(sb)->s_jquota_fmt, type);
2045 }
2046
2047 /*
2048  * Standard function to be called on quota_on
2049  */
2050 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2051                              char *name)
2052 {
2053         int err;
2054         struct path path;
2055         struct inode *inode;
2056         struct reiserfs_transaction_handle th;
2057
2058         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2059                 return -EINVAL;
2060
2061         err = kern_path(name, LOOKUP_FOLLOW, &path);
2062         if (err)
2063                 return err;
2064         /* Quotafile not on the same filesystem? */
2065         if (path.mnt->mnt_sb != sb) {
2066                 err = -EXDEV;
2067                 goto out;
2068         }
2069         inode = path.dentry->d_inode;
2070         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2071         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2072                 err = reiserfs_unpack(inode, NULL);
2073                 if (err) {
2074                         reiserfs_warning(sb, "super-6520",
2075                                 "Unpacking tail of quota file failed"
2076                                 " (%d). Cannot turn on quotas.", err);
2077                         err = -EINVAL;
2078                         goto out;
2079                 }
2080                 mark_inode_dirty(inode);
2081         }
2082         /* Journaling quota? */
2083         if (REISERFS_SB(sb)->s_qf_names[type]) {
2084                 /* Quotafile not of fs root? */
2085                 if (path.dentry->d_parent != sb->s_root)
2086                         reiserfs_warning(sb, "super-6521",
2087                                  "Quota file not on filesystem root. "
2088                                  "Journalled quota will not work.");
2089         }
2090
2091         /*
2092          * When we journal data on quota file, we have to flush journal to see
2093          * all updates to the file when we bypass pagecache...
2094          */
2095         if (reiserfs_file_data_log(inode)) {
2096                 /* Just start temporary transaction and finish it */
2097                 err = journal_begin(&th, sb, 1);
2098                 if (err)
2099                         goto out;
2100                 err = journal_end_sync(&th, sb, 1);
2101                 if (err)
2102                         goto out;
2103         }
2104         err = dquot_quota_on_path(sb, type, format_id, &path);
2105 out:
2106         path_put(&path);
2107         return err;
2108 }
2109
2110 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2111  * acquiring the locks... As quota files are never truncated and quota code
2112  * itself serializes the operations (and noone else should touch the files)
2113  * we don't have to be afraid of races */
2114 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2115                                    size_t len, loff_t off)
2116 {
2117         struct inode *inode = sb_dqopt(sb)->files[type];
2118         unsigned long blk = off >> sb->s_blocksize_bits;
2119         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2120         size_t toread;
2121         struct buffer_head tmp_bh, *bh;
2122         loff_t i_size = i_size_read(inode);
2123
2124         if (off > i_size)
2125                 return 0;
2126         if (off + len > i_size)
2127                 len = i_size - off;
2128         toread = len;
2129         while (toread > 0) {
2130                 tocopy =
2131                     sb->s_blocksize - offset <
2132                     toread ? sb->s_blocksize - offset : toread;
2133                 tmp_bh.b_state = 0;
2134                 /* Quota files are without tails so we can safely use this function */
2135                 reiserfs_write_lock(sb);
2136                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2137                 reiserfs_write_unlock(sb);
2138                 if (err)
2139                         return err;
2140                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2141                         memset(data, 0, tocopy);
2142                 else {
2143                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2144                         if (!bh)
2145                                 return -EIO;
2146                         memcpy(data, bh->b_data + offset, tocopy);
2147                         brelse(bh);
2148                 }
2149                 offset = 0;
2150                 toread -= tocopy;
2151                 data += tocopy;
2152                 blk++;
2153         }
2154         return len;
2155 }
2156
2157 /* Write to quotafile (we know the transaction is already started and has
2158  * enough credits) */
2159 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2160                                     const char *data, size_t len, loff_t off)
2161 {
2162         struct inode *inode = sb_dqopt(sb)->files[type];
2163         unsigned long blk = off >> sb->s_blocksize_bits;
2164         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2165         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2166         size_t towrite = len;
2167         struct buffer_head tmp_bh, *bh;
2168
2169         if (!current->journal_info) {
2170                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2171                         " cancelled because transaction is not started.\n",
2172                         (unsigned long long)off, (unsigned long long)len);
2173                 return -EIO;
2174         }
2175         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2176         while (towrite > 0) {
2177                 tocopy = sb->s_blocksize - offset < towrite ?
2178                     sb->s_blocksize - offset : towrite;
2179                 tmp_bh.b_state = 0;
2180                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2181                 if (err)
2182                         goto out;
2183                 if (offset || tocopy != sb->s_blocksize)
2184                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2185                 else
2186                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2187                 if (!bh) {
2188                         err = -EIO;
2189                         goto out;
2190                 }
2191                 lock_buffer(bh);
2192                 memcpy(bh->b_data + offset, data, tocopy);
2193                 flush_dcache_page(bh->b_page);
2194                 set_buffer_uptodate(bh);
2195                 unlock_buffer(bh);
2196                 reiserfs_prepare_for_journal(sb, bh, 1);
2197                 journal_mark_dirty(current->journal_info, sb, bh);
2198                 if (!journal_quota)
2199                         reiserfs_add_ordered_list(inode, bh);
2200                 brelse(bh);
2201                 offset = 0;
2202                 towrite -= tocopy;
2203                 data += tocopy;
2204                 blk++;
2205         }
2206 out:
2207         if (len == towrite) {
2208                 mutex_unlock(&inode->i_mutex);
2209                 return err;
2210         }
2211         if (inode->i_size < off + len - towrite)
2212                 i_size_write(inode, off + len - towrite);
2213         inode->i_version++;
2214         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2215         mark_inode_dirty(inode);
2216         mutex_unlock(&inode->i_mutex);
2217         return len - towrite;
2218 }
2219
2220 #endif
2221
2222 static int get_super_block(struct file_system_type *fs_type,
2223                            int flags, const char *dev_name,
2224                            void *data, struct vfsmount *mnt)
2225 {
2226         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2227                            mnt);
2228 }
2229
2230 static int __init init_reiserfs_fs(void)
2231 {
2232         int ret;
2233
2234         if ((ret = init_inodecache())) {
2235                 return ret;
2236         }
2237
2238         reiserfs_proc_info_global_init();
2239
2240         ret = register_filesystem(&reiserfs_fs_type);
2241
2242         if (ret == 0) {
2243                 return 0;
2244         }
2245
2246         reiserfs_proc_info_global_done();
2247         destroy_inodecache();
2248
2249         return ret;
2250 }
2251
2252 static void __exit exit_reiserfs_fs(void)
2253 {
2254         reiserfs_proc_info_global_done();
2255         unregister_filesystem(&reiserfs_fs_type);
2256         destroy_inodecache();
2257 }
2258
2259 struct file_system_type reiserfs_fs_type = {
2260         .owner = THIS_MODULE,
2261         .name = "reiserfs",
2262         .get_sb = get_super_block,
2263         .kill_sb = reiserfs_kill_sb,
2264         .fs_flags = FS_REQUIRES_DEV,
2265 };
2266
2267 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2268 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2269 MODULE_LICENSE("GPL");
2270
2271 module_init(init_reiserfs_fs);
2272 module_exit(exit_reiserfs_fs);