Merge branch 'master' into export-slabh
[kernel.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/time.h>
18 #include <asm/uaccess.h>
19 #include <linux/reiserfs_fs.h>
20 #include <linux/reiserfs_acl.h>
21 #include <linux/reiserfs_xattr.h>
22 #include <linux/init.h>
23 #include <linux/blkdev.h>
24 #include <linux/buffer_head.h>
25 #include <linux/exportfs.h>
26 #include <linux/quotaops.h>
27 #include <linux/vfs.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30 #include <linux/crc32.h>
31 #include <linux/smp_lock.h>
32
33 struct file_system_type reiserfs_fs_type;
34
35 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
36 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
37 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
38
39 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
40 {
41         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
42                         strlen(reiserfs_3_5_magic_string));
43 }
44
45 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
46 {
47         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
48                         strlen(reiserfs_3_6_magic_string));
49 }
50
51 int is_reiserfs_jr(struct reiserfs_super_block *rs)
52 {
53         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
54                         strlen(reiserfs_jr_magic_string));
55 }
56
57 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
58 {
59         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
60                 is_reiserfs_jr(rs));
61 }
62
63 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
64 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
65
66 static int reiserfs_sync_fs(struct super_block *s, int wait)
67 {
68         struct reiserfs_transaction_handle th;
69
70         reiserfs_write_lock(s);
71         if (!journal_begin(&th, s, 1))
72                 if (!journal_end_sync(&th, s, 1))
73                         reiserfs_flush_old_commits(s);
74         s->s_dirt = 0;  /* Even if it's not true.
75                          * We'll loop forever in sync_supers otherwise */
76         reiserfs_write_unlock(s);
77         return 0;
78 }
79
80 static void reiserfs_write_super(struct super_block *s)
81 {
82         reiserfs_sync_fs(s, 1);
83 }
84
85 static int reiserfs_freeze(struct super_block *s)
86 {
87         struct reiserfs_transaction_handle th;
88         reiserfs_write_lock(s);
89         if (!(s->s_flags & MS_RDONLY)) {
90                 int err = journal_begin(&th, s, 1);
91                 if (err) {
92                         reiserfs_block_writes(&th);
93                 } else {
94                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
95                                                      1);
96                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
97                         reiserfs_block_writes(&th);
98                         journal_end_sync(&th, s, 1);
99                 }
100         }
101         s->s_dirt = 0;
102         reiserfs_write_unlock(s);
103         return 0;
104 }
105
106 static int reiserfs_unfreeze(struct super_block *s)
107 {
108         reiserfs_allow_writes(s);
109         return 0;
110 }
111
112 extern const struct in_core_key MAX_IN_CORE_KEY;
113
114 /* this is used to delete "save link" when there are no items of a
115    file it points to. It can either happen if unlink is completed but
116    "save unlink" removal, or if file has both unlink and truncate
117    pending and as unlink completes first (because key of "save link"
118    protecting unlink is bigger that a key lf "save link" which
119    protects truncate), so there left no items to make truncate
120    completion on */
121 static int remove_save_link_only(struct super_block *s,
122                                  struct reiserfs_key *key, int oid_free)
123 {
124         struct reiserfs_transaction_handle th;
125         int err;
126
127         /* we are going to do one balancing */
128         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
129         if (err)
130                 return err;
131
132         reiserfs_delete_solid_item(&th, NULL, key);
133         if (oid_free)
134                 /* removals are protected by direct items */
135                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
136
137         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
138 }
139
140 #ifdef CONFIG_QUOTA
141 static int reiserfs_quota_on_mount(struct super_block *, int);
142 #endif
143
144 /* look for uncompleted unlinks and truncates and complete them */
145 static int finish_unfinished(struct super_block *s)
146 {
147         INITIALIZE_PATH(path);
148         struct cpu_key max_cpu_key, obj_key;
149         struct reiserfs_key save_link_key, last_inode_key;
150         int retval = 0;
151         struct item_head *ih;
152         struct buffer_head *bh;
153         int item_pos;
154         char *item;
155         int done;
156         struct inode *inode;
157         int truncate;
158 #ifdef CONFIG_QUOTA
159         int i;
160         int ms_active_set;
161 #endif
162
163         /* compose key to look for "save" links */
164         max_cpu_key.version = KEY_FORMAT_3_5;
165         max_cpu_key.on_disk_key.k_dir_id = ~0U;
166         max_cpu_key.on_disk_key.k_objectid = ~0U;
167         set_cpu_key_k_offset(&max_cpu_key, ~0U);
168         max_cpu_key.key_length = 3;
169
170         memset(&last_inode_key, 0, sizeof(last_inode_key));
171
172 #ifdef CONFIG_QUOTA
173         /* Needed for iput() to work correctly and not trash data */
174         if (s->s_flags & MS_ACTIVE) {
175                 ms_active_set = 0;
176         } else {
177                 ms_active_set = 1;
178                 s->s_flags |= MS_ACTIVE;
179         }
180         /* Turn on quotas so that they are updated correctly */
181         for (i = 0; i < MAXQUOTAS; i++) {
182                 if (REISERFS_SB(s)->s_qf_names[i]) {
183                         int ret = reiserfs_quota_on_mount(s, i);
184                         if (ret < 0)
185                                 reiserfs_warning(s, "reiserfs-2500",
186                                                  "cannot turn on journaled "
187                                                  "quota: error %d", ret);
188                 }
189         }
190 #endif
191
192         done = 0;
193         REISERFS_SB(s)->s_is_unlinked_ok = 1;
194         while (!retval) {
195                 retval = search_item(s, &max_cpu_key, &path);
196                 if (retval != ITEM_NOT_FOUND) {
197                         reiserfs_error(s, "vs-2140",
198                                        "search_by_key returned %d", retval);
199                         break;
200                 }
201
202                 bh = get_last_bh(&path);
203                 item_pos = get_item_pos(&path);
204                 if (item_pos != B_NR_ITEMS(bh)) {
205                         reiserfs_warning(s, "vs-2060",
206                                          "wrong position found");
207                         break;
208                 }
209                 item_pos--;
210                 ih = B_N_PITEM_HEAD(bh, item_pos);
211
212                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
213                         /* there are no "save" links anymore */
214                         break;
215
216                 save_link_key = ih->ih_key;
217                 if (is_indirect_le_ih(ih))
218                         truncate = 1;
219                 else
220                         truncate = 0;
221
222                 /* reiserfs_iget needs k_dirid and k_objectid only */
223                 item = B_I_PITEM(bh, ih);
224                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
225                 obj_key.on_disk_key.k_objectid =
226                     le32_to_cpu(ih->ih_key.k_objectid);
227                 obj_key.on_disk_key.k_offset = 0;
228                 obj_key.on_disk_key.k_type = 0;
229
230                 pathrelse(&path);
231
232                 inode = reiserfs_iget(s, &obj_key);
233                 if (!inode) {
234                         /* the unlink almost completed, it just did not manage to remove
235                            "save" link and release objectid */
236                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
237                                          &obj_key);
238                         retval = remove_save_link_only(s, &save_link_key, 1);
239                         continue;
240                 }
241
242                 if (!truncate && inode->i_nlink) {
243                         /* file is not unlinked */
244                         reiserfs_warning(s, "vs-2185",
245                                          "file %K is not unlinked",
246                                          &obj_key);
247                         retval = remove_save_link_only(s, &save_link_key, 0);
248                         continue;
249                 }
250                 dquot_initialize(inode);
251
252                 if (truncate && S_ISDIR(inode->i_mode)) {
253                         /* We got a truncate request for a dir which is impossible.
254                            The only imaginable way is to execute unfinished truncate request
255                            then boot into old kernel, remove the file and create dir with
256                            the same key. */
257                         reiserfs_warning(s, "green-2101",
258                                          "impossible truncate on a "
259                                          "directory %k. Please report",
260                                          INODE_PKEY(inode));
261                         retval = remove_save_link_only(s, &save_link_key, 0);
262                         truncate = 0;
263                         iput(inode);
264                         continue;
265                 }
266
267                 if (truncate) {
268                         REISERFS_I(inode)->i_flags |=
269                             i_link_saved_truncate_mask;
270                         /* not completed truncate found. New size was committed together
271                            with "save" link */
272                         reiserfs_info(s, "Truncating %k to %Ld ..",
273                                       INODE_PKEY(inode), inode->i_size);
274                         reiserfs_truncate_file(inode,
275                                                0
276                                                /*don't update modification time */
277                                                );
278                         retval = remove_save_link(inode, truncate);
279                 } else {
280                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
281                         /* not completed unlink (rmdir) found */
282                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
283                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
284                                         sizeof(last_inode_key))){
285                                 last_inode_key = *INODE_PKEY(inode);
286                                 /* removal gets completed in iput */
287                                 retval = 0;
288                         } else {
289                                 reiserfs_warning(s, "super-2189", "Dead loop "
290                                                  "in finish_unfinished "
291                                                  "detected, just remove "
292                                                  "save link\n");
293                                 retval = remove_save_link_only(s,
294                                                         &save_link_key, 0);
295                         }
296                 }
297
298                 iput(inode);
299                 printk("done\n");
300                 done++;
301         }
302         REISERFS_SB(s)->s_is_unlinked_ok = 0;
303
304 #ifdef CONFIG_QUOTA
305         /* Turn quotas off */
306         for (i = 0; i < MAXQUOTAS; i++) {
307                 if (sb_dqopt(s)->files[i])
308                         vfs_quota_off(s, i, 0);
309         }
310         if (ms_active_set)
311                 /* Restore the flag back */
312                 s->s_flags &= ~MS_ACTIVE;
313 #endif
314         pathrelse(&path);
315         if (done)
316                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
317                               "Completed\n", done);
318         return retval;
319 }
320
321 /* to protect file being unlinked from getting lost we "safe" link files
322    being unlinked. This link will be deleted in the same transaction with last
323    item of file. mounting the filesystem we scan all these links and remove
324    files which almost got lost */
325 void add_save_link(struct reiserfs_transaction_handle *th,
326                    struct inode *inode, int truncate)
327 {
328         INITIALIZE_PATH(path);
329         int retval;
330         struct cpu_key key;
331         struct item_head ih;
332         __le32 link;
333
334         BUG_ON(!th->t_trans_id);
335
336         /* file can only get one "save link" of each kind */
337         RFALSE(truncate &&
338                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
339                "saved link already exists for truncated inode %lx",
340                (long)inode->i_ino);
341         RFALSE(!truncate &&
342                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
343                "saved link already exists for unlinked inode %lx",
344                (long)inode->i_ino);
345
346         /* setup key of "save" link */
347         key.version = KEY_FORMAT_3_5;
348         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
349         key.on_disk_key.k_objectid = inode->i_ino;
350         if (!truncate) {
351                 /* unlink, rmdir, rename */
352                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
353                 set_cpu_key_k_type(&key, TYPE_DIRECT);
354
355                 /* item head of "safe" link */
356                 make_le_item_head(&ih, &key, key.version,
357                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
358                                   4 /*length */ , 0xffff /*free space */ );
359         } else {
360                 /* truncate */
361                 if (S_ISDIR(inode->i_mode))
362                         reiserfs_warning(inode->i_sb, "green-2102",
363                                          "Adding a truncate savelink for "
364                                          "a directory %k! Please report",
365                                          INODE_PKEY(inode));
366                 set_cpu_key_k_offset(&key, 1);
367                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
368
369                 /* item head of "safe" link */
370                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
371                                   4 /*length */ , 0 /*free space */ );
372         }
373         key.key_length = 3;
374
375         /* look for its place in the tree */
376         retval = search_item(inode->i_sb, &key, &path);
377         if (retval != ITEM_NOT_FOUND) {
378                 if (retval != -ENOSPC)
379                         reiserfs_error(inode->i_sb, "vs-2100",
380                                        "search_by_key (%K) returned %d", &key,
381                                        retval);
382                 pathrelse(&path);
383                 return;
384         }
385
386         /* body of "save" link */
387         link = INODE_PKEY(inode)->k_dir_id;
388
389         /* put "save" link inot tree, don't charge quota to anyone */
390         retval =
391             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
392         if (retval) {
393                 if (retval != -ENOSPC)
394                         reiserfs_error(inode->i_sb, "vs-2120",
395                                        "insert_item returned %d", retval);
396         } else {
397                 if (truncate)
398                         REISERFS_I(inode)->i_flags |=
399                             i_link_saved_truncate_mask;
400                 else
401                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
402         }
403 }
404
405 /* this opens transaction unlike add_save_link */
406 int remove_save_link(struct inode *inode, int truncate)
407 {
408         struct reiserfs_transaction_handle th;
409         struct reiserfs_key key;
410         int err;
411
412         /* we are going to do one balancing only */
413         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
414         if (err)
415                 return err;
416
417         /* setup key of "save" link */
418         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
419         key.k_objectid = INODE_PKEY(inode)->k_objectid;
420         if (!truncate) {
421                 /* unlink, rmdir, rename */
422                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
423                                     1 + inode->i_sb->s_blocksize);
424                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
425         } else {
426                 /* truncate */
427                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
428                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
429         }
430
431         if ((truncate &&
432              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
433             (!truncate &&
434              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
435                 /* don't take quota bytes from anywhere */
436                 reiserfs_delete_solid_item(&th, NULL, &key);
437         if (!truncate) {
438                 reiserfs_release_objectid(&th, inode->i_ino);
439                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
440         } else
441                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
442
443         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
444 }
445
446 static void reiserfs_kill_sb(struct super_block *s)
447 {
448         if (REISERFS_SB(s)) {
449                 if (REISERFS_SB(s)->xattr_root) {
450                         d_invalidate(REISERFS_SB(s)->xattr_root);
451                         dput(REISERFS_SB(s)->xattr_root);
452                         REISERFS_SB(s)->xattr_root = NULL;
453                 }
454                 if (REISERFS_SB(s)->priv_root) {
455                         d_invalidate(REISERFS_SB(s)->priv_root);
456                         dput(REISERFS_SB(s)->priv_root);
457                         REISERFS_SB(s)->priv_root = NULL;
458                 }
459         }
460
461         kill_block_super(s);
462 }
463
464 static void reiserfs_put_super(struct super_block *s)
465 {
466         struct reiserfs_transaction_handle th;
467         th.t_trans_id = 0;
468
469         reiserfs_write_lock(s);
470
471         if (s->s_dirt)
472                 reiserfs_write_super(s);
473
474         /* change file system state to current state if it was mounted with read-write permissions */
475         if (!(s->s_flags & MS_RDONLY)) {
476                 if (!journal_begin(&th, s, 10)) {
477                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
478                                                      1);
479                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
480                                             REISERFS_SB(s)->s_mount_state);
481                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
482                 }
483         }
484
485         /* note, journal_release checks for readonly mount, and can decide not
486          ** to do a journal_end
487          */
488         journal_release(&th, s);
489
490         reiserfs_free_bitmap_cache(s);
491
492         brelse(SB_BUFFER_WITH_SB(s));
493
494         print_statistics(s);
495
496         if (REISERFS_SB(s)->reserved_blocks != 0) {
497                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
498                                  REISERFS_SB(s)->reserved_blocks);
499         }
500
501         reiserfs_proc_info_done(s);
502
503         reiserfs_write_unlock(s);
504         mutex_destroy(&REISERFS_SB(s)->lock);
505         kfree(s->s_fs_info);
506         s->s_fs_info = NULL;
507 }
508
509 static struct kmem_cache *reiserfs_inode_cachep;
510
511 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
512 {
513         struct reiserfs_inode_info *ei;
514         ei = (struct reiserfs_inode_info *)
515             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
516         if (!ei)
517                 return NULL;
518         return &ei->vfs_inode;
519 }
520
521 static void reiserfs_destroy_inode(struct inode *inode)
522 {
523         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
524 }
525
526 static void init_once(void *foo)
527 {
528         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
529
530         INIT_LIST_HEAD(&ei->i_prealloc_list);
531         inode_init_once(&ei->vfs_inode);
532 }
533
534 static int init_inodecache(void)
535 {
536         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
537                                                   sizeof(struct
538                                                          reiserfs_inode_info),
539                                                   0, (SLAB_RECLAIM_ACCOUNT|
540                                                         SLAB_MEM_SPREAD),
541                                                   init_once);
542         if (reiserfs_inode_cachep == NULL)
543                 return -ENOMEM;
544         return 0;
545 }
546
547 static void destroy_inodecache(void)
548 {
549         kmem_cache_destroy(reiserfs_inode_cachep);
550 }
551
552 /* we don't mark inodes dirty, we just log them */
553 static void reiserfs_dirty_inode(struct inode *inode)
554 {
555         struct reiserfs_transaction_handle th;
556
557         int err = 0;
558         int lock_depth;
559
560         if (inode->i_sb->s_flags & MS_RDONLY) {
561                 reiserfs_warning(inode->i_sb, "clm-6006",
562                                  "writing inode %lu on readonly FS",
563                                  inode->i_ino);
564                 return;
565         }
566         lock_depth = reiserfs_write_lock_once(inode->i_sb);
567
568         /* this is really only used for atime updates, so they don't have
569          ** to be included in O_SYNC or fsync
570          */
571         err = journal_begin(&th, inode->i_sb, 1);
572         if (err)
573                 goto out;
574
575         reiserfs_update_sd(&th, inode);
576         journal_end(&th, inode->i_sb, 1);
577
578 out:
579         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
580 }
581
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584         dquot_drop(inode);
585 }
586
587 #ifdef CONFIG_QUOTA
588 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
589                                     size_t, loff_t);
590 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
591                                    loff_t);
592 #endif
593
594 static const struct super_operations reiserfs_sops = {
595         .alloc_inode = reiserfs_alloc_inode,
596         .destroy_inode = reiserfs_destroy_inode,
597         .write_inode = reiserfs_write_inode,
598         .dirty_inode = reiserfs_dirty_inode,
599         .clear_inode = reiserfs_clear_inode,
600         .delete_inode = reiserfs_delete_inode,
601         .put_super = reiserfs_put_super,
602         .write_super = reiserfs_write_super,
603         .sync_fs = reiserfs_sync_fs,
604         .freeze_fs = reiserfs_freeze,
605         .unfreeze_fs = reiserfs_unfreeze,
606         .statfs = reiserfs_statfs,
607         .remount_fs = reiserfs_remount,
608         .show_options = generic_show_options,
609 #ifdef CONFIG_QUOTA
610         .quota_read = reiserfs_quota_read,
611         .quota_write = reiserfs_quota_write,
612 #endif
613 };
614
615 #ifdef CONFIG_QUOTA
616 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
617
618 static int reiserfs_write_dquot(struct dquot *);
619 static int reiserfs_acquire_dquot(struct dquot *);
620 static int reiserfs_release_dquot(struct dquot *);
621 static int reiserfs_mark_dquot_dirty(struct dquot *);
622 static int reiserfs_write_info(struct super_block *, int);
623 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
624
625 static const struct dquot_operations reiserfs_quota_operations = {
626         .write_dquot = reiserfs_write_dquot,
627         .acquire_dquot = reiserfs_acquire_dquot,
628         .release_dquot = reiserfs_release_dquot,
629         .mark_dirty = reiserfs_mark_dquot_dirty,
630         .write_info = reiserfs_write_info,
631         .alloc_dquot    = dquot_alloc,
632         .destroy_dquot  = dquot_destroy,
633 };
634
635 static const struct quotactl_ops reiserfs_qctl_operations = {
636         .quota_on = reiserfs_quota_on,
637         .quota_off = vfs_quota_off,
638         .quota_sync = vfs_quota_sync,
639         .get_info = vfs_get_dqinfo,
640         .set_info = vfs_set_dqinfo,
641         .get_dqblk = vfs_get_dqblk,
642         .set_dqblk = vfs_set_dqblk,
643 };
644 #endif
645
646 static const struct export_operations reiserfs_export_ops = {
647         .encode_fh = reiserfs_encode_fh,
648         .fh_to_dentry = reiserfs_fh_to_dentry,
649         .fh_to_parent = reiserfs_fh_to_parent,
650         .get_parent = reiserfs_get_parent,
651 };
652
653 /* this struct is used in reiserfs_getopt () for containing the value for those
654    mount options that have values rather than being toggles. */
655 typedef struct {
656         char *value;
657         int setmask;            /* bitmask which is to set on mount_options bitmask when this
658                                    value is found, 0 is no bits are to be changed. */
659         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
660                                    value is found, 0 is no bits are to be changed. This is
661                                    applied BEFORE setmask */
662 } arg_desc_t;
663
664 /* Set this bit in arg_required to allow empty arguments */
665 #define REISERFS_OPT_ALLOWEMPTY 31
666
667 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
668    mount options */
669 typedef struct {
670         char *option_name;
671         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
672         const arg_desc_t *values;       /* list of values accepted by an option */
673         int setmask;            /* bitmask which is to set on mount_options bitmask when this
674                                    value is found, 0 is no bits are to be changed. */
675         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
676                                    value is found, 0 is no bits are to be changed. This is
677                                    applied BEFORE setmask */
678 } opt_desc_t;
679
680 /* possible values for -o data= */
681 static const arg_desc_t logging_mode[] = {
682         {"ordered", 1 << REISERFS_DATA_ORDERED,
683          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
684         {"journal", 1 << REISERFS_DATA_LOG,
685          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
686         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
687          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
688         {.value = NULL}
689 };
690
691 /* possible values for -o barrier= */
692 static const arg_desc_t barrier_mode[] = {
693         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
694         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
695         {.value = NULL}
696 };
697
698 /* possible values for "-o block-allocator=" and bits which are to be set in
699    s_mount_opt of reiserfs specific part of in-core super block */
700 static const arg_desc_t balloc[] = {
701         {"noborder", 1 << REISERFS_NO_BORDER, 0},
702         {"border", 0, 1 << REISERFS_NO_BORDER},
703         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
704         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
705         {"test4", 1 << REISERFS_TEST4, 0},
706         {"notest4", 0, 1 << REISERFS_TEST4},
707         {NULL, 0, 0}
708 };
709
710 static const arg_desc_t tails[] = {
711         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
712         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
713         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
714         {NULL, 0, 0}
715 };
716
717 static const arg_desc_t error_actions[] = {
718         {"panic", 1 << REISERFS_ERROR_PANIC,
719          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
720         {"ro-remount", 1 << REISERFS_ERROR_RO,
721          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
722 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
723         {"continue", 1 << REISERFS_ERROR_CONTINUE,
724          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
725 #endif
726         {NULL, 0, 0},
727 };
728
729 /* proceed only one option from a list *cur - string containing of mount options
730    opts - array of options which are accepted
731    opt_arg - if option is found and requires an argument and if it is specifed
732    in the input - pointer to the argument is stored here
733    bit_flags - if option requires to set a certain bit - it is set here
734    return -1 if unknown option is found, opt->arg_required otherwise */
735 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
736                            char **opt_arg, unsigned long *bit_flags)
737 {
738         char *p;
739         /* foo=bar,
740            ^   ^  ^
741            |   |  +-- option_end
742            |   +-- arg_start
743            +-- option_start
744          */
745         const opt_desc_t *opt;
746         const arg_desc_t *arg;
747
748         p = *cur;
749
750         /* assume argument cannot contain commas */
751         *cur = strchr(p, ',');
752         if (*cur) {
753                 *(*cur) = '\0';
754                 (*cur)++;
755         }
756
757         if (!strncmp(p, "alloc=", 6)) {
758                 /* Ugly special case, probably we should redo options parser so that
759                    it can understand several arguments for some options, also so that
760                    it can fill several bitfields with option values. */
761                 if (reiserfs_parse_alloc_options(s, p + 6)) {
762                         return -1;
763                 } else {
764                         return 0;
765                 }
766         }
767
768         /* for every option in the list */
769         for (opt = opts; opt->option_name; opt++) {
770                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
771                         if (bit_flags) {
772                                 if (opt->clrmask ==
773                                     (1 << REISERFS_UNSUPPORTED_OPT))
774                                         reiserfs_warning(s, "super-6500",
775                                                          "%s not supported.\n",
776                                                          p);
777                                 else
778                                         *bit_flags &= ~opt->clrmask;
779                                 if (opt->setmask ==
780                                     (1 << REISERFS_UNSUPPORTED_OPT))
781                                         reiserfs_warning(s, "super-6501",
782                                                          "%s not supported.\n",
783                                                          p);
784                                 else
785                                         *bit_flags |= opt->setmask;
786                         }
787                         break;
788                 }
789         }
790         if (!opt->option_name) {
791                 reiserfs_warning(s, "super-6502",
792                                  "unknown mount option \"%s\"", p);
793                 return -1;
794         }
795
796         p += strlen(opt->option_name);
797         switch (*p) {
798         case '=':
799                 if (!opt->arg_required) {
800                         reiserfs_warning(s, "super-6503",
801                                          "the option \"%s\" does not "
802                                          "require an argument\n",
803                                          opt->option_name);
804                         return -1;
805                 }
806                 break;
807
808         case 0:
809                 if (opt->arg_required) {
810                         reiserfs_warning(s, "super-6504",
811                                          "the option \"%s\" requires an "
812                                          "argument\n", opt->option_name);
813                         return -1;
814                 }
815                 break;
816         default:
817                 reiserfs_warning(s, "super-6505",
818                                  "head of option \"%s\" is only correct\n",
819                                  opt->option_name);
820                 return -1;
821         }
822
823         /* move to the argument, or to next option if argument is not required */
824         p++;
825
826         if (opt->arg_required
827             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828             && !strlen(p)) {
829                 /* this catches "option=," if not allowed */
830                 reiserfs_warning(s, "super-6506",
831                                  "empty argument for \"%s\"\n",
832                                  opt->option_name);
833                 return -1;
834         }
835
836         if (!opt->values) {
837                 /* *=NULLopt_arg contains pointer to argument */
838                 *opt_arg = p;
839                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
840         }
841
842         /* values possible for this option are listed in opt->values */
843         for (arg = opt->values; arg->value; arg++) {
844                 if (!strcmp(p, arg->value)) {
845                         if (bit_flags) {
846                                 *bit_flags &= ~arg->clrmask;
847                                 *bit_flags |= arg->setmask;
848                         }
849                         return opt->arg_required;
850                 }
851         }
852
853         reiserfs_warning(s, "super-6506",
854                          "bad value \"%s\" for option \"%s\"\n", p,
855                          opt->option_name);
856         return -1;
857 }
858
859 /* returns 0 if something is wrong in option string, 1 - otherwise */
860 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
861                                   unsigned long *mount_options,
862                                   /* after the parsing phase, contains the
863                                      collection of bitflags defining what
864                                      mount options were selected. */
865                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
866                                   char **jdev_name,
867                                   unsigned int *commit_max_age,
868                                   char **qf_names,
869                                   unsigned int *qfmt)
870 {
871         int c;
872         char *arg = NULL;
873         char *pos;
874         opt_desc_t opts[] = {
875                 /* Compatibility stuff, so that -o notail for old setups still work */
876                 {"tails",.arg_required = 't',.values = tails},
877                 {"notail",.clrmask =
878                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
879                 {"conv",.setmask = 1 << REISERFS_CONVERT},
880                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
881                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
882                 {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
883 #ifdef CONFIG_REISERFS_FS_XATTR
884                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
885                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
886 #else
887                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
888                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
889 #endif
890 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
891                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
892                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
893 #else
894                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
895                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
896 #endif
897                 {.option_name = "nolog"},
898                 {"replayonly",.setmask = 1 << REPLAYONLY},
899                 {"block-allocator",.arg_required = 'a',.values = balloc},
900                 {"data",.arg_required = 'd',.values = logging_mode},
901                 {"barrier",.arg_required = 'b',.values = barrier_mode},
902                 {"resize",.arg_required = 'r',.values = NULL},
903                 {"jdev",.arg_required = 'j',.values = NULL},
904                 {"nolargeio",.arg_required = 'w',.values = NULL},
905                 {"commit",.arg_required = 'c',.values = NULL},
906                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
907                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
908                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
909                 {"errors",.arg_required = 'e',.values = error_actions},
910                 {"usrjquota",.arg_required =
911                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
912                 {"grpjquota",.arg_required =
913                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
914                 {"jqfmt",.arg_required = 'f',.values = NULL},
915                 {.option_name = NULL}
916         };
917
918         *blocks = 0;
919         if (!options || !*options)
920                 /* use default configuration: create tails, journaling on, no
921                    conversion to newest format */
922                 return 1;
923
924         for (pos = options; pos;) {
925                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
926                 if (c == -1)
927                         /* wrong option is given */
928                         return 0;
929
930                 if (c == 'r') {
931                         char *p;
932
933                         p = NULL;
934                         /* "resize=NNN" or "resize=auto" */
935
936                         if (!strcmp(arg, "auto")) {
937                                 /* From JFS code, to auto-get the size. */
938                                 *blocks =
939                                     s->s_bdev->bd_inode->i_size >> s->
940                                     s_blocksize_bits;
941                         } else {
942                                 *blocks = simple_strtoul(arg, &p, 0);
943                                 if (*p != '\0') {
944                                         /* NNN does not look like a number */
945                                         reiserfs_warning(s, "super-6507",
946                                                          "bad value %s for "
947                                                          "-oresize\n", arg);
948                                         return 0;
949                                 }
950                         }
951                 }
952
953                 if (c == 'c') {
954                         char *p = NULL;
955                         unsigned long val = simple_strtoul(arg, &p, 0);
956                         /* commit=NNN (time in seconds) */
957                         if (*p != '\0' || val >= (unsigned int)-1) {
958                                 reiserfs_warning(s, "super-6508",
959                                                  "bad value %s for -ocommit\n",
960                                                  arg);
961                                 return 0;
962                         }
963                         *commit_max_age = (unsigned int)val;
964                 }
965
966                 if (c == 'w') {
967                         reiserfs_warning(s, "super-6509", "nolargeio option "
968                                          "is no longer supported");
969                         return 0;
970                 }
971
972                 if (c == 'j') {
973                         if (arg && *arg && jdev_name) {
974                                 if (*jdev_name) {       //Hm, already assigned?
975                                         reiserfs_warning(s, "super-6510",
976                                                          "journal device was "
977                                                          "already specified to "
978                                                          "be %s", *jdev_name);
979                                         return 0;
980                                 }
981                                 *jdev_name = arg;
982                         }
983                 }
984 #ifdef CONFIG_QUOTA
985                 if (c == 'u' || c == 'g') {
986                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
987
988                         if (sb_any_quota_loaded(s) &&
989                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
990                                 reiserfs_warning(s, "super-6511",
991                                                  "cannot change journaled "
992                                                  "quota options when quota "
993                                                  "turned on.");
994                                 return 0;
995                         }
996                         if (*arg) {     /* Some filename specified? */
997                                 if (REISERFS_SB(s)->s_qf_names[qtype]
998                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
999                                               arg)) {
1000                                         reiserfs_warning(s, "super-6512",
1001                                                          "%s quota file "
1002                                                          "already specified.",
1003                                                          QTYPE2NAME(qtype));
1004                                         return 0;
1005                                 }
1006                                 if (strchr(arg, '/')) {
1007                                         reiserfs_warning(s, "super-6513",
1008                                                          "quotafile must be "
1009                                                          "on filesystem root.");
1010                                         return 0;
1011                                 }
1012                                 qf_names[qtype] =
1013                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1014                                 if (!qf_names[qtype]) {
1015                                         reiserfs_warning(s, "reiserfs-2502",
1016                                                          "not enough memory "
1017                                                          "for storing "
1018                                                          "quotafile name.");
1019                                         return 0;
1020                                 }
1021                                 strcpy(qf_names[qtype], arg);
1022                                 *mount_options |= 1 << REISERFS_QUOTA;
1023                         } else {
1024                                 if (qf_names[qtype] !=
1025                                     REISERFS_SB(s)->s_qf_names[qtype])
1026                                         kfree(qf_names[qtype]);
1027                                 qf_names[qtype] = NULL;
1028                         }
1029                 }
1030                 if (c == 'f') {
1031                         if (!strcmp(arg, "vfsold"))
1032                                 *qfmt = QFMT_VFS_OLD;
1033                         else if (!strcmp(arg, "vfsv0"))
1034                                 *qfmt = QFMT_VFS_V0;
1035                         else {
1036                                 reiserfs_warning(s, "super-6514",
1037                                                  "unknown quota format "
1038                                                  "specified.");
1039                                 return 0;
1040                         }
1041                         if (sb_any_quota_loaded(s) &&
1042                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1043                                 reiserfs_warning(s, "super-6515",
1044                                                  "cannot change journaled "
1045                                                  "quota options when quota "
1046                                                  "turned on.");
1047                                 return 0;
1048                         }
1049                 }
1050 #else
1051                 if (c == 'u' || c == 'g' || c == 'f') {
1052                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1053                                          "quota options not supported.");
1054                         return 0;
1055                 }
1056 #endif
1057         }
1058
1059 #ifdef CONFIG_QUOTA
1060         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1061             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1062                 reiserfs_warning(s, "super-6515",
1063                                  "journaled quota format not specified.");
1064                 return 0;
1065         }
1066         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1067         if (!(*mount_options & (1 << REISERFS_QUOTA))
1068             && sb_any_quota_loaded(s)) {
1069                 reiserfs_warning(s, "super-6516", "quota options must "
1070                                  "be present when quota is turned on.");
1071                 return 0;
1072         }
1073 #endif
1074
1075         return 1;
1076 }
1077
1078 static void switch_data_mode(struct super_block *s, unsigned long mode)
1079 {
1080         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1081                                          (1 << REISERFS_DATA_ORDERED) |
1082                                          (1 << REISERFS_DATA_WRITEBACK));
1083         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1084 }
1085
1086 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1087 {
1088         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1089                 if (!reiserfs_data_log(s)) {
1090                         switch_data_mode(s, REISERFS_DATA_LOG);
1091                         reiserfs_info(s, "switching to journaled data mode\n");
1092                 }
1093         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1094                 if (!reiserfs_data_ordered(s)) {
1095                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1096                         reiserfs_info(s, "switching to ordered data mode\n");
1097                 }
1098         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1099                 if (!reiserfs_data_writeback(s)) {
1100                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1101                         reiserfs_info(s, "switching to writeback data mode\n");
1102                 }
1103         }
1104 }
1105
1106 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1107 {
1108         int flush = (1 << REISERFS_BARRIER_FLUSH);
1109         int none = (1 << REISERFS_BARRIER_NONE);
1110         int all_barrier = flush | none;
1111
1112         if (bits & all_barrier) {
1113                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1114                 if (bits & flush) {
1115                         REISERFS_SB(s)->s_mount_opt |= flush;
1116                         printk("reiserfs: enabling write barrier flush mode\n");
1117                 } else if (bits & none) {
1118                         REISERFS_SB(s)->s_mount_opt |= none;
1119                         printk("reiserfs: write barriers turned off\n");
1120                 }
1121         }
1122 }
1123
1124 static void handle_attrs(struct super_block *s)
1125 {
1126         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1127
1128         if (reiserfs_attrs(s)) {
1129                 if (old_format_only(s)) {
1130                         reiserfs_warning(s, "super-6517", "cannot support "
1131                                          "attributes on 3.5.x disk format");
1132                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1133                         return;
1134                 }
1135                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1136                         reiserfs_warning(s, "super-6518", "cannot support "
1137                                          "attributes until flag is set in "
1138                                          "super-block");
1139                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1140                 }
1141         }
1142 }
1143
1144 #ifdef CONFIG_QUOTA
1145 static void handle_quota_files(struct super_block *s, char **qf_names,
1146                                unsigned int *qfmt)
1147 {
1148         int i;
1149
1150         for (i = 0; i < MAXQUOTAS; i++) {
1151                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1152                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1153                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1154         }
1155         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1156 }
1157 #endif
1158
1159 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1160 {
1161         struct reiserfs_super_block *rs;
1162         struct reiserfs_transaction_handle th;
1163         unsigned long blocks;
1164         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1165         unsigned long safe_mask = 0;
1166         unsigned int commit_max_age = (unsigned int)-1;
1167         struct reiserfs_journal *journal = SB_JOURNAL(s);
1168         char *new_opts = kstrdup(arg, GFP_KERNEL);
1169         int err;
1170         char *qf_names[MAXQUOTAS];
1171         unsigned int qfmt = 0;
1172 #ifdef CONFIG_QUOTA
1173         int i;
1174 #endif
1175
1176         reiserfs_write_lock(s);
1177
1178 #ifdef CONFIG_QUOTA
1179         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1180 #endif
1181
1182         rs = SB_DISK_SUPER_BLOCK(s);
1183
1184         if (!reiserfs_parse_options
1185             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1186             qf_names, &qfmt)) {
1187 #ifdef CONFIG_QUOTA
1188                 for (i = 0; i < MAXQUOTAS; i++)
1189                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1190                                 kfree(qf_names[i]);
1191 #endif
1192                 err = -EINVAL;
1193                 goto out_err;
1194         }
1195 #ifdef CONFIG_QUOTA
1196         handle_quota_files(s, qf_names, &qfmt);
1197 #endif
1198
1199         handle_attrs(s);
1200
1201         /* Add options that are safe here */
1202         safe_mask |= 1 << REISERFS_SMALLTAIL;
1203         safe_mask |= 1 << REISERFS_LARGETAIL;
1204         safe_mask |= 1 << REISERFS_NO_BORDER;
1205         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1206         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1207         safe_mask |= 1 << REISERFS_TEST4;
1208         safe_mask |= 1 << REISERFS_ATTRS;
1209         safe_mask |= 1 << REISERFS_XATTRS_USER;
1210         safe_mask |= 1 << REISERFS_POSIXACL;
1211         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1212         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1213         safe_mask |= 1 << REISERFS_ERROR_RO;
1214         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1215         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1216         safe_mask |= 1 << REISERFS_QUOTA;
1217
1218         /* Update the bitmask, taking care to keep
1219          * the bits we're not allowed to change here */
1220         REISERFS_SB(s)->s_mount_opt =
1221             (REISERFS_SB(s)->
1222              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1223
1224         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1225                 journal->j_max_commit_age = commit_max_age;
1226                 journal->j_max_trans_age = commit_max_age;
1227         } else if (commit_max_age == 0) {
1228                 /* 0 means restore defaults. */
1229                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1230                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1231         }
1232
1233         if (blocks) {
1234                 err = reiserfs_resize(s, blocks);
1235                 if (err != 0)
1236                         goto out_err;
1237         }
1238
1239         if (*mount_flags & MS_RDONLY) {
1240                 reiserfs_xattr_init(s, *mount_flags);
1241                 /* remount read-only */
1242                 if (s->s_flags & MS_RDONLY)
1243                         /* it is read-only already */
1244                         goto out_ok;
1245                 /* try to remount file system with read-only permissions */
1246                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1247                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1248                         goto out_ok;
1249                 }
1250
1251                 err = journal_begin(&th, s, 10);
1252                 if (err)
1253                         goto out_err;
1254
1255                 /* Mounting a rw partition read-only. */
1256                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1257                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1258                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1259         } else {
1260                 /* remount read-write */
1261                 if (!(s->s_flags & MS_RDONLY)) {
1262                         reiserfs_xattr_init(s, *mount_flags);
1263                         goto out_ok;    /* We are read-write already */
1264                 }
1265
1266                 if (reiserfs_is_journal_aborted(journal)) {
1267                         err = journal->j_errno;
1268                         goto out_err;
1269                 }
1270
1271                 handle_data_mode(s, mount_options);
1272                 handle_barrier_mode(s, mount_options);
1273                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1274                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1275                 err = journal_begin(&th, s, 10);
1276                 if (err)
1277                         goto out_err;
1278
1279                 /* Mount a partition which is read-only, read-write */
1280                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1281                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1282                 s->s_flags &= ~MS_RDONLY;
1283                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1284                 if (!old_format_only(s))
1285                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1286                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1287                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1288                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1289         }
1290         /* this will force a full flush of all journal lists */
1291         SB_JOURNAL(s)->j_must_wait = 1;
1292         err = journal_end(&th, s, 10);
1293         if (err)
1294                 goto out_err;
1295         s->s_dirt = 0;
1296
1297         if (!(*mount_flags & MS_RDONLY)) {
1298                 finish_unfinished(s);
1299                 reiserfs_xattr_init(s, *mount_flags);
1300         }
1301
1302 out_ok:
1303         replace_mount_options(s, new_opts);
1304         reiserfs_write_unlock(s);
1305         return 0;
1306
1307 out_err:
1308         kfree(new_opts);
1309         reiserfs_write_unlock(s);
1310         return err;
1311 }
1312
1313 static int read_super_block(struct super_block *s, int offset)
1314 {
1315         struct buffer_head *bh;
1316         struct reiserfs_super_block *rs;
1317         int fs_blocksize;
1318
1319         bh = sb_bread(s, offset / s->s_blocksize);
1320         if (!bh) {
1321                 reiserfs_warning(s, "sh-2006",
1322                                  "bread failed (dev %s, block %lu, size %lu)",
1323                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1324                                  s->s_blocksize);
1325                 return 1;
1326         }
1327
1328         rs = (struct reiserfs_super_block *)bh->b_data;
1329         if (!is_any_reiserfs_magic_string(rs)) {
1330                 brelse(bh);
1331                 return 1;
1332         }
1333         //
1334         // ok, reiserfs signature (old or new) found in at the given offset
1335         //
1336         fs_blocksize = sb_blocksize(rs);
1337         brelse(bh);
1338         sb_set_blocksize(s, fs_blocksize);
1339
1340         bh = sb_bread(s, offset / s->s_blocksize);
1341         if (!bh) {
1342                 reiserfs_warning(s, "sh-2007",
1343                                  "bread failed (dev %s, block %lu, size %lu)",
1344                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1345                                  s->s_blocksize);
1346                 return 1;
1347         }
1348
1349         rs = (struct reiserfs_super_block *)bh->b_data;
1350         if (sb_blocksize(rs) != s->s_blocksize) {
1351                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1352                                  "filesystem on (dev %s, block %Lu, size %lu)",
1353                                  reiserfs_bdevname(s),
1354                                  (unsigned long long)bh->b_blocknr,
1355                                  s->s_blocksize);
1356                 brelse(bh);
1357                 return 1;
1358         }
1359
1360         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1361                 brelse(bh);
1362                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1363                                  "--rebuild-tree run detected. Please run\n"
1364                                  "reiserfsck --rebuild-tree and wait for a "
1365                                  "completion. If that fails\n"
1366                                  "get newer reiserfsprogs package");
1367                 return 1;
1368         }
1369
1370         SB_BUFFER_WITH_SB(s) = bh;
1371         SB_DISK_SUPER_BLOCK(s) = rs;
1372
1373         if (is_reiserfs_jr(rs)) {
1374                 /* magic is of non-standard journal filesystem, look at s_version to
1375                    find which format is in use */
1376                 if (sb_version(rs) == REISERFS_VERSION_2)
1377                         reiserfs_info(s, "found reiserfs format \"3.6\""
1378                                       " with non-standard journal\n");
1379                 else if (sb_version(rs) == REISERFS_VERSION_1)
1380                         reiserfs_info(s, "found reiserfs format \"3.5\""
1381                                       " with non-standard journal\n");
1382                 else {
1383                         reiserfs_warning(s, "sh-2012", "found unknown "
1384                                          "format \"%u\" of reiserfs with "
1385                                          "non-standard magic", sb_version(rs));
1386                         return 1;
1387                 }
1388         } else
1389                 /* s_version of standard format may contain incorrect information,
1390                    so we just look at the magic string */
1391                 reiserfs_info(s,
1392                               "found reiserfs format \"%s\" with standard journal\n",
1393                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1394
1395         s->s_op = &reiserfs_sops;
1396         s->s_export_op = &reiserfs_export_ops;
1397 #ifdef CONFIG_QUOTA
1398         s->s_qcop = &reiserfs_qctl_operations;
1399         s->dq_op = &reiserfs_quota_operations;
1400 #endif
1401
1402         /* new format is limited by the 32 bit wide i_blocks field, want to
1403          ** be one full block below that.
1404          */
1405         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1406         return 0;
1407 }
1408
1409 /* after journal replay, reread all bitmap and super blocks */
1410 static int reread_meta_blocks(struct super_block *s)
1411 {
1412         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1413         reiserfs_write_unlock(s);
1414         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1415         reiserfs_write_lock(s);
1416         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1417                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1418                 return 1;
1419         }
1420
1421         return 0;
1422 }
1423
1424 /////////////////////////////////////////////////////
1425 // hash detection stuff
1426
1427 // if root directory is empty - we set default - Yura's - hash and
1428 // warn about it
1429 // FIXME: we look for only one name in a directory. If tea and yura
1430 // bith have the same value - we ask user to send report to the
1431 // mailing list
1432 static __u32 find_hash_out(struct super_block *s)
1433 {
1434         int retval;
1435         struct inode *inode;
1436         struct cpu_key key;
1437         INITIALIZE_PATH(path);
1438         struct reiserfs_dir_entry de;
1439         __u32 hash = DEFAULT_HASH;
1440
1441         inode = s->s_root->d_inode;
1442
1443         do {                    // Some serious "goto"-hater was there ;)
1444                 u32 teahash, r5hash, yurahash;
1445
1446                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1447                 retval = search_by_entry_key(s, &key, &path, &de);
1448                 if (retval == IO_ERROR) {
1449                         pathrelse(&path);
1450                         return UNSET_HASH;
1451                 }
1452                 if (retval == NAME_NOT_FOUND)
1453                         de.de_entry_num--;
1454                 set_de_name_and_namelen(&de);
1455                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1456                         /* allow override in this case */
1457                         if (reiserfs_rupasov_hash(s)) {
1458                                 hash = YURA_HASH;
1459                         }
1460                         reiserfs_info(s, "FS seems to be empty, autodetect "
1461                                          "is using the default hash\n");
1462                         break;
1463                 }
1464                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1465                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1466                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1467                 if (((teahash == r5hash)
1468                      &&
1469                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1470                       == r5hash)) || ((teahash == yurahash)
1471                                       && (yurahash ==
1472                                           GET_HASH_VALUE(deh_offset
1473                                                          (&
1474                                                           (de.
1475                                                            de_deh[de.
1476                                                                   de_entry_num])))))
1477                     || ((r5hash == yurahash)
1478                         && (yurahash ==
1479                             GET_HASH_VALUE(deh_offset
1480                                            (&(de.de_deh[de.de_entry_num])))))) {
1481                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1482                                          "automatically detect hash function. "
1483                                          "Please mount with -o "
1484                                          "hash={tea,rupasov,r5}");
1485                         hash = UNSET_HASH;
1486                         break;
1487                 }
1488                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1489                     yurahash)
1490                         hash = YURA_HASH;
1491                 else if (GET_HASH_VALUE
1492                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1493                         hash = TEA_HASH;
1494                 else if (GET_HASH_VALUE
1495                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1496                         hash = R5_HASH;
1497                 else {
1498                         reiserfs_warning(s, "reiserfs-2506",
1499                                          "Unrecognised hash function");
1500                         hash = UNSET_HASH;
1501                 }
1502         } while (0);
1503
1504         pathrelse(&path);
1505         return hash;
1506 }
1507
1508 // finds out which hash names are sorted with
1509 static int what_hash(struct super_block *s)
1510 {
1511         __u32 code;
1512
1513         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1514
1515         /* reiserfs_hash_detect() == true if any of the hash mount options
1516          ** were used.  We must check them to make sure the user isn't
1517          ** using a bad hash value
1518          */
1519         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1520                 code = find_hash_out(s);
1521
1522         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1523                 /* detection has found the hash, and we must check against the
1524                  ** mount options
1525                  */
1526                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1527                         reiserfs_warning(s, "reiserfs-2507",
1528                                          "Error, %s hash detected, "
1529                                          "unable to force rupasov hash",
1530                                          reiserfs_hashname(code));
1531                         code = UNSET_HASH;
1532                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1533                         reiserfs_warning(s, "reiserfs-2508",
1534                                          "Error, %s hash detected, "
1535                                          "unable to force tea hash",
1536                                          reiserfs_hashname(code));
1537                         code = UNSET_HASH;
1538                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1539                         reiserfs_warning(s, "reiserfs-2509",
1540                                          "Error, %s hash detected, "
1541                                          "unable to force r5 hash",
1542                                          reiserfs_hashname(code));
1543                         code = UNSET_HASH;
1544                 }
1545         } else {
1546                 /* find_hash_out was not called or could not determine the hash */
1547                 if (reiserfs_rupasov_hash(s)) {
1548                         code = YURA_HASH;
1549                 } else if (reiserfs_tea_hash(s)) {
1550                         code = TEA_HASH;
1551                 } else if (reiserfs_r5_hash(s)) {
1552                         code = R5_HASH;
1553                 }
1554         }
1555
1556         /* if we are mounted RW, and we have a new valid hash code, update
1557          ** the super
1558          */
1559         if (code != UNSET_HASH &&
1560             !(s->s_flags & MS_RDONLY) &&
1561             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1562                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1563         }
1564         return code;
1565 }
1566
1567 // return pointer to appropriate function
1568 static hashf_t hash_function(struct super_block *s)
1569 {
1570         switch (what_hash(s)) {
1571         case TEA_HASH:
1572                 reiserfs_info(s, "Using tea hash to sort names\n");
1573                 return keyed_hash;
1574         case YURA_HASH:
1575                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1576                 return yura_hash;
1577         case R5_HASH:
1578                 reiserfs_info(s, "Using r5 hash to sort names\n");
1579                 return r5_hash;
1580         }
1581         return NULL;
1582 }
1583
1584 // this is used to set up correct value for old partitions
1585 static int function2code(hashf_t func)
1586 {
1587         if (func == keyed_hash)
1588                 return TEA_HASH;
1589         if (func == yura_hash)
1590                 return YURA_HASH;
1591         if (func == r5_hash)
1592                 return R5_HASH;
1593
1594         BUG();                  // should never happen
1595
1596         return 0;
1597 }
1598
1599 #define SWARN(silent, s, id, ...)                       \
1600         if (!(silent))                          \
1601                 reiserfs_warning(s, id, __VA_ARGS__)
1602
1603 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1604 {
1605         struct inode *root_inode;
1606         struct reiserfs_transaction_handle th;
1607         int old_format = 0;
1608         unsigned long blocks;
1609         unsigned int commit_max_age = 0;
1610         int jinit_done = 0;
1611         struct reiserfs_iget_args args;
1612         struct reiserfs_super_block *rs;
1613         char *jdev_name;
1614         struct reiserfs_sb_info *sbi;
1615         int errval = -EINVAL;
1616         char *qf_names[MAXQUOTAS] = {};
1617         unsigned int qfmt = 0;
1618
1619         save_mount_options(s, data);
1620
1621         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1622         if (!sbi)
1623                 return -ENOMEM;
1624         s->s_fs_info = sbi;
1625         /* Set default values for options: non-aggressive tails, RO on errors */
1626         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1627         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1628         /* no preallocation minimum, be smart in
1629            reiserfs_file_write instead */
1630         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1631         /* Preallocate by 16 blocks (17-1) at once */
1632         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1633         /* setup default block allocator options */
1634         reiserfs_init_alloc_options(s);
1635
1636         mutex_init(&REISERFS_SB(s)->lock);
1637         REISERFS_SB(s)->lock_depth = -1;
1638
1639         /*
1640          * This function is called with the bkl, which also was the old
1641          * locking used here.
1642          * do_journal_begin() will soon check if we hold the lock (ie: was the
1643          * bkl). This is likely because do_journal_begin() has several another
1644          * callers because at this time, it doesn't seem to be necessary to
1645          * protect against anything.
1646          * Anyway, let's be conservative and lock for now.
1647          */
1648         reiserfs_write_lock(s);
1649
1650         jdev_name = NULL;
1651         if (reiserfs_parse_options
1652             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1653              &commit_max_age, qf_names, &qfmt) == 0) {
1654                 goto error;
1655         }
1656 #ifdef CONFIG_QUOTA
1657         handle_quota_files(s, qf_names, &qfmt);
1658 #endif
1659
1660         if (blocks) {
1661                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1662                 goto error;
1663         }
1664
1665         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1666         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1667                 old_format = 1;
1668         /* try new format (64-th 1k block), which can contain reiserfs super block */
1669         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1670                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1671                       reiserfs_bdevname(s));
1672                 goto error;
1673         }
1674
1675         rs = SB_DISK_SUPER_BLOCK(s);
1676         /* Let's do basic sanity check to verify that underlying device is not
1677            smaller than the filesystem. If the check fails then abort and scream,
1678            because bad stuff will happen otherwise. */
1679         if (s->s_bdev && s->s_bdev->bd_inode
1680             && i_size_read(s->s_bdev->bd_inode) <
1681             sb_block_count(rs) * sb_blocksize(rs)) {
1682                 SWARN(silent, s, "", "Filesystem cannot be "
1683                       "mounted because it is bigger than the device");
1684                 SWARN(silent, s, "", "You may need to run fsck "
1685                       "or increase size of your LVM partition");
1686                 SWARN(silent, s, "", "Or may be you forgot to "
1687                       "reboot after fdisk when it told you to");
1688                 goto error;
1689         }
1690
1691         sbi->s_mount_state = SB_REISERFS_STATE(s);
1692         sbi->s_mount_state = REISERFS_VALID_FS;
1693
1694         if ((errval = reiserfs_init_bitmap_cache(s))) {
1695                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1696                 goto error;
1697         }
1698         errval = -EINVAL;
1699 #ifdef CONFIG_REISERFS_CHECK
1700         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1701         SWARN(silent, s, "", "- it is slow mode for debugging.");
1702 #endif
1703
1704         /* make data=ordered the default */
1705         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1706             !reiserfs_data_writeback(s)) {
1707                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1708         }
1709
1710         if (reiserfs_data_log(s)) {
1711                 reiserfs_info(s, "using journaled data mode\n");
1712         } else if (reiserfs_data_ordered(s)) {
1713                 reiserfs_info(s, "using ordered data mode\n");
1714         } else {
1715                 reiserfs_info(s, "using writeback data mode\n");
1716         }
1717         if (reiserfs_barrier_flush(s)) {
1718                 printk("reiserfs: using flush barriers\n");
1719         }
1720         // set_device_ro(s->s_dev, 1) ;
1721         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1722                 SWARN(silent, s, "sh-2022",
1723                       "unable to initialize journal space");
1724                 goto error;
1725         } else {
1726                 jinit_done = 1; /* once this is set, journal_release must be called
1727                                  ** if we error out of the mount
1728                                  */
1729         }
1730         if (reread_meta_blocks(s)) {
1731                 SWARN(silent, s, "jmacd-9",
1732                       "unable to reread meta blocks after journal init");
1733                 goto error;
1734         }
1735
1736         if (replay_only(s))
1737                 goto error;
1738
1739         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1740                 SWARN(silent, s, "clm-7000",
1741                       "Detected readonly device, marking FS readonly");
1742                 s->s_flags |= MS_RDONLY;
1743         }
1744         args.objectid = REISERFS_ROOT_OBJECTID;
1745         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1746         root_inode =
1747             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1748                          reiserfs_init_locked_inode, (void *)(&args));
1749         if (!root_inode) {
1750                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1751                 goto error;
1752         }
1753
1754         if (root_inode->i_state & I_NEW) {
1755                 reiserfs_read_locked_inode(root_inode, &args);
1756                 unlock_new_inode(root_inode);
1757         }
1758
1759         s->s_root = d_alloc_root(root_inode);
1760         if (!s->s_root) {
1761                 iput(root_inode);
1762                 goto error;
1763         }
1764         // define and initialize hash function
1765         sbi->s_hash_function = hash_function(s);
1766         if (sbi->s_hash_function == NULL) {
1767                 dput(s->s_root);
1768                 s->s_root = NULL;
1769                 goto error;
1770         }
1771
1772         if (is_reiserfs_3_5(rs)
1773             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1774                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1775         else if (old_format)
1776                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1777         else
1778                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1779
1780         if (!(s->s_flags & MS_RDONLY)) {
1781
1782                 errval = journal_begin(&th, s, 1);
1783                 if (errval) {
1784                         dput(s->s_root);
1785                         s->s_root = NULL;
1786                         goto error;
1787                 }
1788                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1789
1790                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1791                 set_sb_fs_state(rs, 0);
1792
1793                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1794                  * case, but older revisions can't. This will cause the
1795                  * file system to fail mount on those older implementations,
1796                  * avoiding corruption. -jeffm */
1797                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1798                     sb_bmap_nr(rs) != 0) {
1799                         reiserfs_warning(s, "super-2030", "This file system "
1800                                         "claims to use %u bitmap blocks in "
1801                                         "its super block, but requires %u. "
1802                                         "Clearing to zero.", sb_bmap_nr(rs),
1803                                         reiserfs_bmap_count(s));
1804
1805                         set_sb_bmap_nr(rs, 0);
1806                 }
1807
1808                 if (old_format_only(s)) {
1809                         /* filesystem of format 3.5 either with standard or non-standard
1810                            journal */
1811                         if (convert_reiserfs(s)) {
1812                                 /* and -o conv is given */
1813                                 if (!silent)
1814                                         reiserfs_info(s,
1815                                                       "converting 3.5 filesystem to the 3.6 format");
1816
1817                                 if (is_reiserfs_3_5(rs))
1818                                         /* put magic string of 3.6 format. 2.2 will not be able to
1819                                            mount this filesystem anymore */
1820                                         memcpy(rs->s_v1.s_magic,
1821                                                reiserfs_3_6_magic_string,
1822                                                sizeof
1823                                                (reiserfs_3_6_magic_string));
1824
1825                                 set_sb_version(rs, REISERFS_VERSION_2);
1826                                 reiserfs_convert_objectid_map_v1(s);
1827                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1828                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1829                         } else if (!silent) {
1830                                 reiserfs_info(s, "using 3.5.x disk format\n");
1831                         }
1832                 } else
1833                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1834
1835
1836                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1837                 errval = journal_end(&th, s, 1);
1838                 if (errval) {
1839                         dput(s->s_root);
1840                         s->s_root = NULL;
1841                         goto error;
1842                 }
1843
1844                 if ((errval = reiserfs_lookup_privroot(s)) ||
1845                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1846                         dput(s->s_root);
1847                         s->s_root = NULL;
1848                         goto error;
1849                 }
1850
1851                 /* look for files which were to be removed in previous session */
1852                 finish_unfinished(s);
1853         } else {
1854                 if (old_format_only(s) && !silent) {
1855                         reiserfs_info(s, "using 3.5.x disk format\n");
1856                 }
1857
1858                 if ((errval = reiserfs_lookup_privroot(s)) ||
1859                     (errval = reiserfs_xattr_init(s, s->s_flags))) {
1860                         dput(s->s_root);
1861                         s->s_root = NULL;
1862                         goto error;
1863                 }
1864         }
1865         // mark hash in super block: it could be unset. overwrite should be ok
1866         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1867
1868         handle_attrs(s);
1869
1870         reiserfs_proc_info_init(s);
1871
1872         init_waitqueue_head(&(sbi->s_wait));
1873         spin_lock_init(&sbi->bitmap_lock);
1874
1875         reiserfs_write_unlock(s);
1876
1877         return (0);
1878
1879 error:
1880         if (jinit_done) {       /* kill the commit thread, free journal ram */
1881                 journal_release_error(NULL, s);
1882         }
1883
1884         reiserfs_write_unlock(s);
1885
1886         reiserfs_free_bitmap_cache(s);
1887         if (SB_BUFFER_WITH_SB(s))
1888                 brelse(SB_BUFFER_WITH_SB(s));
1889 #ifdef CONFIG_QUOTA
1890         {
1891                 int j;
1892                 for (j = 0; j < MAXQUOTAS; j++)
1893                         kfree(qf_names[j]);
1894         }
1895 #endif
1896         kfree(sbi);
1897
1898         s->s_fs_info = NULL;
1899         return errval;
1900 }
1901
1902 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1903 {
1904         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1905
1906         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1907         buf->f_bfree = sb_free_blocks(rs);
1908         buf->f_bavail = buf->f_bfree;
1909         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1910         buf->f_bsize = dentry->d_sb->s_blocksize;
1911         /* changed to accommodate gcc folks. */
1912         buf->f_type = REISERFS_SUPER_MAGIC;
1913         buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
1914         buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
1915                                 sizeof(rs->s_uuid)/2);
1916
1917         return 0;
1918 }
1919
1920 #ifdef CONFIG_QUOTA
1921 static int reiserfs_write_dquot(struct dquot *dquot)
1922 {
1923         struct reiserfs_transaction_handle th;
1924         int ret, err;
1925
1926         reiserfs_write_lock(dquot->dq_sb);
1927         ret =
1928             journal_begin(&th, dquot->dq_sb,
1929                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1930         if (ret)
1931                 goto out;
1932         ret = dquot_commit(dquot);
1933         err =
1934             journal_end(&th, dquot->dq_sb,
1935                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1936         if (!ret && err)
1937                 ret = err;
1938       out:
1939         reiserfs_write_unlock(dquot->dq_sb);
1940         return ret;
1941 }
1942
1943 static int reiserfs_acquire_dquot(struct dquot *dquot)
1944 {
1945         struct reiserfs_transaction_handle th;
1946         int ret, err;
1947
1948         reiserfs_write_lock(dquot->dq_sb);
1949         ret =
1950             journal_begin(&th, dquot->dq_sb,
1951                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1952         if (ret)
1953                 goto out;
1954         ret = dquot_acquire(dquot);
1955         err =
1956             journal_end(&th, dquot->dq_sb,
1957                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1958         if (!ret && err)
1959                 ret = err;
1960       out:
1961         reiserfs_write_unlock(dquot->dq_sb);
1962         return ret;
1963 }
1964
1965 static int reiserfs_release_dquot(struct dquot *dquot)
1966 {
1967         struct reiserfs_transaction_handle th;
1968         int ret, err;
1969
1970         reiserfs_write_lock(dquot->dq_sb);
1971         ret =
1972             journal_begin(&th, dquot->dq_sb,
1973                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1974         if (ret) {
1975                 /* Release dquot anyway to avoid endless cycle in dqput() */
1976                 dquot_release(dquot);
1977                 goto out;
1978         }
1979         ret = dquot_release(dquot);
1980         err =
1981             journal_end(&th, dquot->dq_sb,
1982                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
1983         if (!ret && err)
1984                 ret = err;
1985       out:
1986         reiserfs_write_unlock(dquot->dq_sb);
1987         return ret;
1988 }
1989
1990 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
1991 {
1992         /* Are we journaling quotas? */
1993         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
1994             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
1995                 dquot_mark_dquot_dirty(dquot);
1996                 return reiserfs_write_dquot(dquot);
1997         } else
1998                 return dquot_mark_dquot_dirty(dquot);
1999 }
2000
2001 static int reiserfs_write_info(struct super_block *sb, int type)
2002 {
2003         struct reiserfs_transaction_handle th;
2004         int ret, err;
2005
2006         /* Data block + inode block */
2007         reiserfs_write_lock(sb);
2008         ret = journal_begin(&th, sb, 2);
2009         if (ret)
2010                 goto out;
2011         ret = dquot_commit_info(sb, type);
2012         err = journal_end(&th, sb, 2);
2013         if (!ret && err)
2014                 ret = err;
2015       out:
2016         reiserfs_write_unlock(sb);
2017         return ret;
2018 }
2019
2020 /*
2021  * Turn on quotas during mount time - we need to find the quota file and such...
2022  */
2023 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2024 {
2025         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2026                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2027 }
2028
2029 /*
2030  * Standard function to be called on quota_on
2031  */
2032 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2033                              char *name, int remount)
2034 {
2035         int err;
2036         struct path path;
2037         struct inode *inode;
2038         struct reiserfs_transaction_handle th;
2039
2040         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2041                 return -EINVAL;
2042         /* No more checks needed? Path and format_id are bogus anyway... */
2043         if (remount)
2044                 return vfs_quota_on(sb, type, format_id, name, 1);
2045         err = kern_path(name, LOOKUP_FOLLOW, &path);
2046         if (err)
2047                 return err;
2048         /* Quotafile not on the same filesystem? */
2049         if (path.mnt->mnt_sb != sb) {
2050                 err = -EXDEV;
2051                 goto out;
2052         }
2053         inode = path.dentry->d_inode;
2054         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2055         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2056                 err = reiserfs_unpack(inode, NULL);
2057                 if (err) {
2058                         reiserfs_warning(sb, "super-6520",
2059                                 "Unpacking tail of quota file failed"
2060                                 " (%d). Cannot turn on quotas.", err);
2061                         err = -EINVAL;
2062                         goto out;
2063                 }
2064                 mark_inode_dirty(inode);
2065         }
2066         /* Journaling quota? */
2067         if (REISERFS_SB(sb)->s_qf_names[type]) {
2068                 /* Quotafile not of fs root? */
2069                 if (path.dentry->d_parent != sb->s_root)
2070                         reiserfs_warning(sb, "super-6521",
2071                                  "Quota file not on filesystem root. "
2072                                  "Journalled quota will not work.");
2073         }
2074
2075         /*
2076          * When we journal data on quota file, we have to flush journal to see
2077          * all updates to the file when we bypass pagecache...
2078          */
2079         if (reiserfs_file_data_log(inode)) {
2080                 /* Just start temporary transaction and finish it */
2081                 err = journal_begin(&th, sb, 1);
2082                 if (err)
2083                         goto out;
2084                 err = journal_end_sync(&th, sb, 1);
2085                 if (err)
2086                         goto out;
2087         }
2088         err = vfs_quota_on_path(sb, type, format_id, &path);
2089 out:
2090         path_put(&path);
2091         return err;
2092 }
2093
2094 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2095  * acquiring the locks... As quota files are never truncated and quota code
2096  * itself serializes the operations (and noone else should touch the files)
2097  * we don't have to be afraid of races */
2098 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2099                                    size_t len, loff_t off)
2100 {
2101         struct inode *inode = sb_dqopt(sb)->files[type];
2102         unsigned long blk = off >> sb->s_blocksize_bits;
2103         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2104         size_t toread;
2105         struct buffer_head tmp_bh, *bh;
2106         loff_t i_size = i_size_read(inode);
2107
2108         if (off > i_size)
2109                 return 0;
2110         if (off + len > i_size)
2111                 len = i_size - off;
2112         toread = len;
2113         while (toread > 0) {
2114                 tocopy =
2115                     sb->s_blocksize - offset <
2116                     toread ? sb->s_blocksize - offset : toread;
2117                 tmp_bh.b_state = 0;
2118                 /* Quota files are without tails so we can safely use this function */
2119                 reiserfs_write_lock(sb);
2120                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2121                 reiserfs_write_unlock(sb);
2122                 if (err)
2123                         return err;
2124                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2125                         memset(data, 0, tocopy);
2126                 else {
2127                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2128                         if (!bh)
2129                                 return -EIO;
2130                         memcpy(data, bh->b_data + offset, tocopy);
2131                         brelse(bh);
2132                 }
2133                 offset = 0;
2134                 toread -= tocopy;
2135                 data += tocopy;
2136                 blk++;
2137         }
2138         return len;
2139 }
2140
2141 /* Write to quotafile (we know the transaction is already started and has
2142  * enough credits) */
2143 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2144                                     const char *data, size_t len, loff_t off)
2145 {
2146         struct inode *inode = sb_dqopt(sb)->files[type];
2147         unsigned long blk = off >> sb->s_blocksize_bits;
2148         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2149         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2150         size_t towrite = len;
2151         struct buffer_head tmp_bh, *bh;
2152
2153         if (!current->journal_info) {
2154                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2155                         " cancelled because transaction is not started.\n",
2156                         (unsigned long long)off, (unsigned long long)len);
2157                 return -EIO;
2158         }
2159         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2160         while (towrite > 0) {
2161                 tocopy = sb->s_blocksize - offset < towrite ?
2162                     sb->s_blocksize - offset : towrite;
2163                 tmp_bh.b_state = 0;
2164                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2165                 if (err)
2166                         goto out;
2167                 if (offset || tocopy != sb->s_blocksize)
2168                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2169                 else
2170                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2171                 if (!bh) {
2172                         err = -EIO;
2173                         goto out;
2174                 }
2175                 lock_buffer(bh);
2176                 memcpy(bh->b_data + offset, data, tocopy);
2177                 flush_dcache_page(bh->b_page);
2178                 set_buffer_uptodate(bh);
2179                 unlock_buffer(bh);
2180                 reiserfs_prepare_for_journal(sb, bh, 1);
2181                 journal_mark_dirty(current->journal_info, sb, bh);
2182                 if (!journal_quota)
2183                         reiserfs_add_ordered_list(inode, bh);
2184                 brelse(bh);
2185                 offset = 0;
2186                 towrite -= tocopy;
2187                 data += tocopy;
2188                 blk++;
2189         }
2190 out:
2191         if (len == towrite) {
2192                 mutex_unlock(&inode->i_mutex);
2193                 return err;
2194         }
2195         if (inode->i_size < off + len - towrite)
2196                 i_size_write(inode, off + len - towrite);
2197         inode->i_version++;
2198         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2199         mark_inode_dirty(inode);
2200         mutex_unlock(&inode->i_mutex);
2201         return len - towrite;
2202 }
2203
2204 #endif
2205
2206 static int get_super_block(struct file_system_type *fs_type,
2207                            int flags, const char *dev_name,
2208                            void *data, struct vfsmount *mnt)
2209 {
2210         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2211                            mnt);
2212 }
2213
2214 static int __init init_reiserfs_fs(void)
2215 {
2216         int ret;
2217
2218         if ((ret = init_inodecache())) {
2219                 return ret;
2220         }
2221
2222         reiserfs_proc_info_global_init();
2223
2224         ret = register_filesystem(&reiserfs_fs_type);
2225
2226         if (ret == 0) {
2227                 return 0;
2228         }
2229
2230         reiserfs_proc_info_global_done();
2231         destroy_inodecache();
2232
2233         return ret;
2234 }
2235
2236 static void __exit exit_reiserfs_fs(void)
2237 {
2238         reiserfs_proc_info_global_done();
2239         unregister_filesystem(&reiserfs_fs_type);
2240         destroy_inodecache();
2241 }
2242
2243 struct file_system_type reiserfs_fs_type = {
2244         .owner = THIS_MODULE,
2245         .name = "reiserfs",
2246         .get_sb = get_super_block,
2247         .kill_sb = reiserfs_kill_sb,
2248         .fs_flags = FS_REQUIRES_DEV,
2249 };
2250
2251 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2252 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2253 MODULE_LICENSE("GPL");
2254
2255 module_init(init_reiserfs_fs);
2256 module_exit(exit_reiserfs_fs);