reiserfs: eliminate per-super xattr lock
[linux-2.6.git] / fs / reiserfs / super.c
1 /*
2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  *
4  * Trivial changes by Alan Cox to add the LFS fixes
5  *
6  * Trivial Changes:
7  * Rights granted to Hans Reiser to redistribute under other terms providing
8  * he accepts all liability including but not limited to patent, fitness
9  * for purpose, and direct or indirect claims arising from failure to perform.
10  *
11  * NO WARRANTY
12  */
13
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
16 #include <linux/time.h>
17 #include <asm/uaccess.h>
18 #include <linux/reiserfs_fs.h>
19 #include <linux/reiserfs_acl.h>
20 #include <linux/reiserfs_xattr.h>
21 #include <linux/init.h>
22 #include <linux/blkdev.h>
23 #include <linux/buffer_head.h>
24 #include <linux/exportfs.h>
25 #include <linux/quotaops.h>
26 #include <linux/vfs.h>
27 #include <linux/mnt_namespace.h>
28 #include <linux/mount.h>
29 #include <linux/namei.h>
30
31 struct file_system_type reiserfs_fs_type;
32
33 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
34 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
35 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
36
37 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
38 {
39         return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
40                         strlen(reiserfs_3_5_magic_string));
41 }
42
43 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
44 {
45         return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
46                         strlen(reiserfs_3_6_magic_string));
47 }
48
49 int is_reiserfs_jr(struct reiserfs_super_block *rs)
50 {
51         return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
52                         strlen(reiserfs_jr_magic_string));
53 }
54
55 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
56 {
57         return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
58                 is_reiserfs_jr(rs));
59 }
60
61 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
62 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
63
64 static int reiserfs_sync_fs(struct super_block *s, int wait)
65 {
66         if (!(s->s_flags & MS_RDONLY)) {
67                 struct reiserfs_transaction_handle th;
68                 reiserfs_write_lock(s);
69                 if (!journal_begin(&th, s, 1))
70                         if (!journal_end_sync(&th, s, 1))
71                                 reiserfs_flush_old_commits(s);
72                 s->s_dirt = 0;  /* Even if it's not true.
73                                  * We'll loop forever in sync_supers otherwise */
74                 reiserfs_write_unlock(s);
75         } else {
76                 s->s_dirt = 0;
77         }
78         return 0;
79 }
80
81 static void reiserfs_write_super(struct super_block *s)
82 {
83         reiserfs_sync_fs(s, 1);
84 }
85
86 static int reiserfs_freeze(struct super_block *s)
87 {
88         struct reiserfs_transaction_handle th;
89         reiserfs_write_lock(s);
90         if (!(s->s_flags & MS_RDONLY)) {
91                 int err = journal_begin(&th, s, 1);
92                 if (err) {
93                         reiserfs_block_writes(&th);
94                 } else {
95                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
96                                                      1);
97                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
98                         reiserfs_block_writes(&th);
99                         journal_end_sync(&th, s, 1);
100                 }
101         }
102         s->s_dirt = 0;
103         reiserfs_write_unlock(s);
104         return 0;
105 }
106
107 static int reiserfs_unfreeze(struct super_block *s)
108 {
109         reiserfs_allow_writes(s);
110         return 0;
111 }
112
113 extern const struct in_core_key MAX_IN_CORE_KEY;
114
115 /* this is used to delete "save link" when there are no items of a
116    file it points to. It can either happen if unlink is completed but
117    "save unlink" removal, or if file has both unlink and truncate
118    pending and as unlink completes first (because key of "save link"
119    protecting unlink is bigger that a key lf "save link" which
120    protects truncate), so there left no items to make truncate
121    completion on */
122 static int remove_save_link_only(struct super_block *s,
123                                  struct reiserfs_key *key, int oid_free)
124 {
125         struct reiserfs_transaction_handle th;
126         int err;
127
128         /* we are going to do one balancing */
129         err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
130         if (err)
131                 return err;
132
133         reiserfs_delete_solid_item(&th, NULL, key);
134         if (oid_free)
135                 /* removals are protected by direct items */
136                 reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
137
138         return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
139 }
140
141 #ifdef CONFIG_QUOTA
142 static int reiserfs_quota_on_mount(struct super_block *, int);
143 #endif
144
145 /* look for uncompleted unlinks and truncates and complete them */
146 static int finish_unfinished(struct super_block *s)
147 {
148         INITIALIZE_PATH(path);
149         struct cpu_key max_cpu_key, obj_key;
150         struct reiserfs_key save_link_key, last_inode_key;
151         int retval = 0;
152         struct item_head *ih;
153         struct buffer_head *bh;
154         int item_pos;
155         char *item;
156         int done;
157         struct inode *inode;
158         int truncate;
159 #ifdef CONFIG_QUOTA
160         int i;
161         int ms_active_set;
162 #endif
163
164         /* compose key to look for "save" links */
165         max_cpu_key.version = KEY_FORMAT_3_5;
166         max_cpu_key.on_disk_key.k_dir_id = ~0U;
167         max_cpu_key.on_disk_key.k_objectid = ~0U;
168         set_cpu_key_k_offset(&max_cpu_key, ~0U);
169         max_cpu_key.key_length = 3;
170
171         memset(&last_inode_key, 0, sizeof(last_inode_key));
172
173 #ifdef CONFIG_QUOTA
174         /* Needed for iput() to work correctly and not trash data */
175         if (s->s_flags & MS_ACTIVE) {
176                 ms_active_set = 0;
177         } else {
178                 ms_active_set = 1;
179                 s->s_flags |= MS_ACTIVE;
180         }
181         /* Turn on quotas so that they are updated correctly */
182         for (i = 0; i < MAXQUOTAS; i++) {
183                 if (REISERFS_SB(s)->s_qf_names[i]) {
184                         int ret = reiserfs_quota_on_mount(s, i);
185                         if (ret < 0)
186                                 reiserfs_warning(s, "reiserfs-2500",
187                                                  "cannot turn on journaled "
188                                                  "quota: error %d", ret);
189                 }
190         }
191 #endif
192
193         done = 0;
194         REISERFS_SB(s)->s_is_unlinked_ok = 1;
195         while (!retval) {
196                 retval = search_item(s, &max_cpu_key, &path);
197                 if (retval != ITEM_NOT_FOUND) {
198                         reiserfs_error(s, "vs-2140",
199                                        "search_by_key returned %d", retval);
200                         break;
201                 }
202
203                 bh = get_last_bh(&path);
204                 item_pos = get_item_pos(&path);
205                 if (item_pos != B_NR_ITEMS(bh)) {
206                         reiserfs_warning(s, "vs-2060",
207                                          "wrong position found");
208                         break;
209                 }
210                 item_pos--;
211                 ih = B_N_PITEM_HEAD(bh, item_pos);
212
213                 if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
214                         /* there are no "save" links anymore */
215                         break;
216
217                 save_link_key = ih->ih_key;
218                 if (is_indirect_le_ih(ih))
219                         truncate = 1;
220                 else
221                         truncate = 0;
222
223                 /* reiserfs_iget needs k_dirid and k_objectid only */
224                 item = B_I_PITEM(bh, ih);
225                 obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
226                 obj_key.on_disk_key.k_objectid =
227                     le32_to_cpu(ih->ih_key.k_objectid);
228                 obj_key.on_disk_key.k_offset = 0;
229                 obj_key.on_disk_key.k_type = 0;
230
231                 pathrelse(&path);
232
233                 inode = reiserfs_iget(s, &obj_key);
234                 if (!inode) {
235                         /* the unlink almost completed, it just did not manage to remove
236                            "save" link and release objectid */
237                         reiserfs_warning(s, "vs-2180", "iget failed for %K",
238                                          &obj_key);
239                         retval = remove_save_link_only(s, &save_link_key, 1);
240                         continue;
241                 }
242
243                 if (!truncate && inode->i_nlink) {
244                         /* file is not unlinked */
245                         reiserfs_warning(s, "vs-2185",
246                                          "file %K is not unlinked",
247                                          &obj_key);
248                         retval = remove_save_link_only(s, &save_link_key, 0);
249                         continue;
250                 }
251                 DQUOT_INIT(inode);
252
253                 if (truncate && S_ISDIR(inode->i_mode)) {
254                         /* We got a truncate request for a dir which is impossible.
255                            The only imaginable way is to execute unfinished truncate request
256                            then boot into old kernel, remove the file and create dir with
257                            the same key. */
258                         reiserfs_warning(s, "green-2101",
259                                          "impossible truncate on a "
260                                          "directory %k. Please report",
261                                          INODE_PKEY(inode));
262                         retval = remove_save_link_only(s, &save_link_key, 0);
263                         truncate = 0;
264                         iput(inode);
265                         continue;
266                 }
267
268                 if (truncate) {
269                         REISERFS_I(inode)->i_flags |=
270                             i_link_saved_truncate_mask;
271                         /* not completed truncate found. New size was committed together
272                            with "save" link */
273                         reiserfs_info(s, "Truncating %k to %Ld ..",
274                                       INODE_PKEY(inode), inode->i_size);
275                         reiserfs_truncate_file(inode,
276                                                0
277                                                /*don't update modification time */
278                                                );
279                         retval = remove_save_link(inode, truncate);
280                 } else {
281                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
282                         /* not completed unlink (rmdir) found */
283                         reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
284                         if (memcmp(&last_inode_key, INODE_PKEY(inode),
285                                         sizeof(last_inode_key))){
286                                 last_inode_key = *INODE_PKEY(inode);
287                                 /* removal gets completed in iput */
288                                 retval = 0;
289                         } else {
290                                 reiserfs_warning(s, "super-2189", "Dead loop "
291                                                  "in finish_unfinished "
292                                                  "detected, just remove "
293                                                  "save link\n");
294                                 retval = remove_save_link_only(s,
295                                                         &save_link_key, 0);
296                         }
297                 }
298
299                 iput(inode);
300                 printk("done\n");
301                 done++;
302         }
303         REISERFS_SB(s)->s_is_unlinked_ok = 0;
304
305 #ifdef CONFIG_QUOTA
306         /* Turn quotas off */
307         for (i = 0; i < MAXQUOTAS; i++) {
308                 if (sb_dqopt(s)->files[i])
309                         vfs_quota_off(s, i, 0);
310         }
311         if (ms_active_set)
312                 /* Restore the flag back */
313                 s->s_flags &= ~MS_ACTIVE;
314 #endif
315         pathrelse(&path);
316         if (done)
317                 reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
318                               "Completed\n", done);
319         return retval;
320 }
321
322 /* to protect file being unlinked from getting lost we "safe" link files
323    being unlinked. This link will be deleted in the same transaction with last
324    item of file. mounting the filesystem we scan all these links and remove
325    files which almost got lost */
326 void add_save_link(struct reiserfs_transaction_handle *th,
327                    struct inode *inode, int truncate)
328 {
329         INITIALIZE_PATH(path);
330         int retval;
331         struct cpu_key key;
332         struct item_head ih;
333         __le32 link;
334
335         BUG_ON(!th->t_trans_id);
336
337         /* file can only get one "save link" of each kind */
338         RFALSE(truncate &&
339                (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
340                "saved link already exists for truncated inode %lx",
341                (long)inode->i_ino);
342         RFALSE(!truncate &&
343                (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
344                "saved link already exists for unlinked inode %lx",
345                (long)inode->i_ino);
346
347         /* setup key of "save" link */
348         key.version = KEY_FORMAT_3_5;
349         key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
350         key.on_disk_key.k_objectid = inode->i_ino;
351         if (!truncate) {
352                 /* unlink, rmdir, rename */
353                 set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
354                 set_cpu_key_k_type(&key, TYPE_DIRECT);
355
356                 /* item head of "safe" link */
357                 make_le_item_head(&ih, &key, key.version,
358                                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
359                                   4 /*length */ , 0xffff /*free space */ );
360         } else {
361                 /* truncate */
362                 if (S_ISDIR(inode->i_mode))
363                         reiserfs_warning(inode->i_sb, "green-2102",
364                                          "Adding a truncate savelink for "
365                                          "a directory %k! Please report",
366                                          INODE_PKEY(inode));
367                 set_cpu_key_k_offset(&key, 1);
368                 set_cpu_key_k_type(&key, TYPE_INDIRECT);
369
370                 /* item head of "safe" link */
371                 make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
372                                   4 /*length */ , 0 /*free space */ );
373         }
374         key.key_length = 3;
375
376         /* look for its place in the tree */
377         retval = search_item(inode->i_sb, &key, &path);
378         if (retval != ITEM_NOT_FOUND) {
379                 if (retval != -ENOSPC)
380                         reiserfs_error(inode->i_sb, "vs-2100",
381                                        "search_by_key (%K) returned %d", &key,
382                                        retval);
383                 pathrelse(&path);
384                 return;
385         }
386
387         /* body of "save" link */
388         link = INODE_PKEY(inode)->k_dir_id;
389
390         /* put "save" link inot tree, don't charge quota to anyone */
391         retval =
392             reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
393         if (retval) {
394                 if (retval != -ENOSPC)
395                         reiserfs_error(inode->i_sb, "vs-2120",
396                                        "insert_item returned %d", retval);
397         } else {
398                 if (truncate)
399                         REISERFS_I(inode)->i_flags |=
400                             i_link_saved_truncate_mask;
401                 else
402                         REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
403         }
404 }
405
406 /* this opens transaction unlike add_save_link */
407 int remove_save_link(struct inode *inode, int truncate)
408 {
409         struct reiserfs_transaction_handle th;
410         struct reiserfs_key key;
411         int err;
412
413         /* we are going to do one balancing only */
414         err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
415         if (err)
416                 return err;
417
418         /* setup key of "save" link */
419         key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
420         key.k_objectid = INODE_PKEY(inode)->k_objectid;
421         if (!truncate) {
422                 /* unlink, rmdir, rename */
423                 set_le_key_k_offset(KEY_FORMAT_3_5, &key,
424                                     1 + inode->i_sb->s_blocksize);
425                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
426         } else {
427                 /* truncate */
428                 set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
429                 set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
430         }
431
432         if ((truncate &&
433              (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
434             (!truncate &&
435              (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
436                 /* don't take quota bytes from anywhere */
437                 reiserfs_delete_solid_item(&th, NULL, &key);
438         if (!truncate) {
439                 reiserfs_release_objectid(&th, inode->i_ino);
440                 REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
441         } else
442                 REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
443
444         return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
445 }
446
447 static void reiserfs_kill_sb(struct super_block *s)
448 {
449         if (REISERFS_SB(s)) {
450 #ifdef CONFIG_REISERFS_FS_XATTR
451                 if (REISERFS_SB(s)->xattr_root) {
452                         d_invalidate(REISERFS_SB(s)->xattr_root);
453                         dput(REISERFS_SB(s)->xattr_root);
454                         REISERFS_SB(s)->xattr_root = NULL;
455                 }
456 #endif
457                 if (REISERFS_SB(s)->priv_root) {
458                         d_invalidate(REISERFS_SB(s)->priv_root);
459                         dput(REISERFS_SB(s)->priv_root);
460                         REISERFS_SB(s)->priv_root = NULL;
461                 }
462         }
463
464         kill_block_super(s);
465 }
466
467 static void reiserfs_put_super(struct super_block *s)
468 {
469         struct reiserfs_transaction_handle th;
470         th.t_trans_id = 0;
471
472         /* change file system state to current state if it was mounted with read-write permissions */
473         if (!(s->s_flags & MS_RDONLY)) {
474                 if (!journal_begin(&th, s, 10)) {
475                         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
476                                                      1);
477                         set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
478                                             REISERFS_SB(s)->s_mount_state);
479                         journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
480                 }
481         }
482
483         /* note, journal_release checks for readonly mount, and can decide not
484          ** to do a journal_end
485          */
486         journal_release(&th, s);
487
488         reiserfs_free_bitmap_cache(s);
489
490         brelse(SB_BUFFER_WITH_SB(s));
491
492         print_statistics(s);
493
494         if (REISERFS_SB(s)->reserved_blocks != 0) {
495                 reiserfs_warning(s, "green-2005", "reserved blocks left %d",
496                                  REISERFS_SB(s)->reserved_blocks);
497         }
498
499         reiserfs_proc_info_done(s);
500
501         kfree(s->s_fs_info);
502         s->s_fs_info = NULL;
503
504         return;
505 }
506
507 static struct kmem_cache *reiserfs_inode_cachep;
508
509 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
510 {
511         struct reiserfs_inode_info *ei;
512         ei = (struct reiserfs_inode_info *)
513             kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
514         if (!ei)
515                 return NULL;
516         return &ei->vfs_inode;
517 }
518
519 static void reiserfs_destroy_inode(struct inode *inode)
520 {
521         kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
522 }
523
524 static void init_once(void *foo)
525 {
526         struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
527
528         INIT_LIST_HEAD(&ei->i_prealloc_list);
529         inode_init_once(&ei->vfs_inode);
530 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
531         ei->i_acl_access = NULL;
532         ei->i_acl_default = NULL;
533 #endif
534 }
535
536 static int init_inodecache(void)
537 {
538         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
539                                                   sizeof(struct
540                                                          reiserfs_inode_info),
541                                                   0, (SLAB_RECLAIM_ACCOUNT|
542                                                         SLAB_MEM_SPREAD),
543                                                   init_once);
544         if (reiserfs_inode_cachep == NULL)
545                 return -ENOMEM;
546         return 0;
547 }
548
549 static void destroy_inodecache(void)
550 {
551         kmem_cache_destroy(reiserfs_inode_cachep);
552 }
553
554 /* we don't mark inodes dirty, we just log them */
555 static void reiserfs_dirty_inode(struct inode *inode)
556 {
557         struct reiserfs_transaction_handle th;
558
559         int err = 0;
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         reiserfs_write_lock(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                 reiserfs_write_unlock(inode->i_sb);
574                 return;
575         }
576         reiserfs_update_sd(&th, inode);
577         journal_end(&th, inode->i_sb, 1);
578         reiserfs_write_unlock(inode->i_sb);
579 }
580
581 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
582 static void reiserfs_clear_inode(struct inode *inode)
583 {
584         struct posix_acl *acl;
585
586         acl = REISERFS_I(inode)->i_acl_access;
587         if (acl && !IS_ERR(acl))
588                 posix_acl_release(acl);
589         REISERFS_I(inode)->i_acl_access = NULL;
590
591         acl = REISERFS_I(inode)->i_acl_default;
592         if (acl && !IS_ERR(acl))
593                 posix_acl_release(acl);
594         REISERFS_I(inode)->i_acl_default = NULL;
595 }
596 #else
597 #define reiserfs_clear_inode NULL
598 #endif
599
600 #ifdef CONFIG_QUOTA
601 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
602                                     size_t, loff_t);
603 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
604                                    loff_t);
605 #endif
606
607 static const struct super_operations reiserfs_sops = {
608         .alloc_inode = reiserfs_alloc_inode,
609         .destroy_inode = reiserfs_destroy_inode,
610         .write_inode = reiserfs_write_inode,
611         .dirty_inode = reiserfs_dirty_inode,
612         .delete_inode = reiserfs_delete_inode,
613         .clear_inode = reiserfs_clear_inode,
614         .put_super = reiserfs_put_super,
615         .write_super = reiserfs_write_super,
616         .sync_fs = reiserfs_sync_fs,
617         .freeze_fs = reiserfs_freeze,
618         .unfreeze_fs = reiserfs_unfreeze,
619         .statfs = reiserfs_statfs,
620         .remount_fs = reiserfs_remount,
621         .show_options = generic_show_options,
622 #ifdef CONFIG_QUOTA
623         .quota_read = reiserfs_quota_read,
624         .quota_write = reiserfs_quota_write,
625 #endif
626 };
627
628 #ifdef CONFIG_QUOTA
629 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
630
631 static int reiserfs_dquot_initialize(struct inode *, int);
632 static int reiserfs_dquot_drop(struct inode *);
633 static int reiserfs_write_dquot(struct dquot *);
634 static int reiserfs_acquire_dquot(struct dquot *);
635 static int reiserfs_release_dquot(struct dquot *);
636 static int reiserfs_mark_dquot_dirty(struct dquot *);
637 static int reiserfs_write_info(struct super_block *, int);
638 static int reiserfs_quota_on(struct super_block *, int, int, char *, int);
639
640 static struct dquot_operations reiserfs_quota_operations = {
641         .initialize = reiserfs_dquot_initialize,
642         .drop = reiserfs_dquot_drop,
643         .alloc_space = dquot_alloc_space,
644         .alloc_inode = dquot_alloc_inode,
645         .free_space = dquot_free_space,
646         .free_inode = dquot_free_inode,
647         .transfer = dquot_transfer,
648         .write_dquot = reiserfs_write_dquot,
649         .acquire_dquot = reiserfs_acquire_dquot,
650         .release_dquot = reiserfs_release_dquot,
651         .mark_dirty = reiserfs_mark_dquot_dirty,
652         .write_info = reiserfs_write_info,
653         .alloc_dquot    = dquot_alloc,
654         .destroy_dquot  = dquot_destroy,
655 };
656
657 static struct quotactl_ops reiserfs_qctl_operations = {
658         .quota_on = reiserfs_quota_on,
659         .quota_off = vfs_quota_off,
660         .quota_sync = vfs_quota_sync,
661         .get_info = vfs_get_dqinfo,
662         .set_info = vfs_set_dqinfo,
663         .get_dqblk = vfs_get_dqblk,
664         .set_dqblk = vfs_set_dqblk,
665 };
666 #endif
667
668 static const struct export_operations reiserfs_export_ops = {
669         .encode_fh = reiserfs_encode_fh,
670         .fh_to_dentry = reiserfs_fh_to_dentry,
671         .fh_to_parent = reiserfs_fh_to_parent,
672         .get_parent = reiserfs_get_parent,
673 };
674
675 /* this struct is used in reiserfs_getopt () for containing the value for those
676    mount options that have values rather than being toggles. */
677 typedef struct {
678         char *value;
679         int setmask;            /* bitmask which is to set on mount_options bitmask when this
680                                    value is found, 0 is no bits are to be changed. */
681         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
682                                    value is found, 0 is no bits are to be changed. This is
683                                    applied BEFORE setmask */
684 } arg_desc_t;
685
686 /* Set this bit in arg_required to allow empty arguments */
687 #define REISERFS_OPT_ALLOWEMPTY 31
688
689 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
690    mount options */
691 typedef struct {
692         char *option_name;
693         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
694         const arg_desc_t *values;       /* list of values accepted by an option */
695         int setmask;            /* bitmask which is to set on mount_options bitmask when this
696                                    value is found, 0 is no bits are to be changed. */
697         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
698                                    value is found, 0 is no bits are to be changed. This is
699                                    applied BEFORE setmask */
700 } opt_desc_t;
701
702 /* possible values for -o data= */
703 static const arg_desc_t logging_mode[] = {
704         {"ordered", 1 << REISERFS_DATA_ORDERED,
705          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
706         {"journal", 1 << REISERFS_DATA_LOG,
707          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
708         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
709          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
710         {.value = NULL}
711 };
712
713 /* possible values for -o barrier= */
714 static const arg_desc_t barrier_mode[] = {
715         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
716         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
717         {.value = NULL}
718 };
719
720 /* possible values for "-o block-allocator=" and bits which are to be set in
721    s_mount_opt of reiserfs specific part of in-core super block */
722 static const arg_desc_t balloc[] = {
723         {"noborder", 1 << REISERFS_NO_BORDER, 0},
724         {"border", 0, 1 << REISERFS_NO_BORDER},
725         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
726         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
727         {"test4", 1 << REISERFS_TEST4, 0},
728         {"notest4", 0, 1 << REISERFS_TEST4},
729         {NULL, 0, 0}
730 };
731
732 static const arg_desc_t tails[] = {
733         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
734         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
735         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
736         {NULL, 0, 0}
737 };
738
739 static const arg_desc_t error_actions[] = {
740         {"panic", 1 << REISERFS_ERROR_PANIC,
741          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
742         {"ro-remount", 1 << REISERFS_ERROR_RO,
743          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
744 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
745         {"continue", 1 << REISERFS_ERROR_CONTINUE,
746          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
747 #endif
748         {NULL, 0, 0},
749 };
750
751 /* proceed only one option from a list *cur - string containing of mount options
752    opts - array of options which are accepted
753    opt_arg - if option is found and requires an argument and if it is specifed
754    in the input - pointer to the argument is stored here
755    bit_flags - if option requires to set a certain bit - it is set here
756    return -1 if unknown option is found, opt->arg_required otherwise */
757 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
758                            char **opt_arg, unsigned long *bit_flags)
759 {
760         char *p;
761         /* foo=bar, 
762            ^   ^  ^
763            |   |  +-- option_end
764            |   +-- arg_start
765            +-- option_start
766          */
767         const opt_desc_t *opt;
768         const arg_desc_t *arg;
769
770         p = *cur;
771
772         /* assume argument cannot contain commas */
773         *cur = strchr(p, ',');
774         if (*cur) {
775                 *(*cur) = '\0';
776                 (*cur)++;
777         }
778
779         if (!strncmp(p, "alloc=", 6)) {
780                 /* Ugly special case, probably we should redo options parser so that
781                    it can understand several arguments for some options, also so that
782                    it can fill several bitfields with option values. */
783                 if (reiserfs_parse_alloc_options(s, p + 6)) {
784                         return -1;
785                 } else {
786                         return 0;
787                 }
788         }
789
790         /* for every option in the list */
791         for (opt = opts; opt->option_name; opt++) {
792                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
793                         if (bit_flags) {
794                                 if (opt->clrmask ==
795                                     (1 << REISERFS_UNSUPPORTED_OPT))
796                                         reiserfs_warning(s, "super-6500",
797                                                          "%s not supported.\n",
798                                                          p);
799                                 else
800                                         *bit_flags &= ~opt->clrmask;
801                                 if (opt->setmask ==
802                                     (1 << REISERFS_UNSUPPORTED_OPT))
803                                         reiserfs_warning(s, "super-6501",
804                                                          "%s not supported.\n",
805                                                          p);
806                                 else
807                                         *bit_flags |= opt->setmask;
808                         }
809                         break;
810                 }
811         }
812         if (!opt->option_name) {
813                 reiserfs_warning(s, "super-6502",
814                                  "unknown mount option \"%s\"", p);
815                 return -1;
816         }
817
818         p += strlen(opt->option_name);
819         switch (*p) {
820         case '=':
821                 if (!opt->arg_required) {
822                         reiserfs_warning(s, "super-6503",
823                                          "the option \"%s\" does not "
824                                          "require an argument\n",
825                                          opt->option_name);
826                         return -1;
827                 }
828                 break;
829
830         case 0:
831                 if (opt->arg_required) {
832                         reiserfs_warning(s, "super-6504",
833                                          "the option \"%s\" requires an "
834                                          "argument\n", opt->option_name);
835                         return -1;
836                 }
837                 break;
838         default:
839                 reiserfs_warning(s, "super-6505",
840                                  "head of option \"%s\" is only correct\n",
841                                  opt->option_name);
842                 return -1;
843         }
844
845         /* move to the argument, or to next option if argument is not required */
846         p++;
847
848         if (opt->arg_required
849             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
850             && !strlen(p)) {
851                 /* this catches "option=," if not allowed */
852                 reiserfs_warning(s, "super-6506",
853                                  "empty argument for \"%s\"\n",
854                                  opt->option_name);
855                 return -1;
856         }
857
858         if (!opt->values) {
859                 /* *=NULLopt_arg contains pointer to argument */
860                 *opt_arg = p;
861                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
862         }
863
864         /* values possible for this option are listed in opt->values */
865         for (arg = opt->values; arg->value; arg++) {
866                 if (!strcmp(p, arg->value)) {
867                         if (bit_flags) {
868                                 *bit_flags &= ~arg->clrmask;
869                                 *bit_flags |= arg->setmask;
870                         }
871                         return opt->arg_required;
872                 }
873         }
874
875         reiserfs_warning(s, "super-6506",
876                          "bad value \"%s\" for option \"%s\"\n", p,
877                          opt->option_name);
878         return -1;
879 }
880
881 /* returns 0 if something is wrong in option string, 1 - otherwise */
882 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
883                                   unsigned long *mount_options,
884                                   /* after the parsing phase, contains the
885                                      collection of bitflags defining what
886                                      mount options were selected. */
887                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
888                                   char **jdev_name,
889                                   unsigned int *commit_max_age,
890                                   char **qf_names,
891                                   unsigned int *qfmt)
892 {
893         int c;
894         char *arg = NULL;
895         char *pos;
896         opt_desc_t opts[] = {
897                 /* Compatibility stuff, so that -o notail for old setups still work */
898                 {"tails",.arg_required = 't',.values = tails},
899                 {"notail",.clrmask =
900                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
901                 {"conv",.setmask = 1 << REISERFS_CONVERT},
902                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
903                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
904 #ifdef CONFIG_REISERFS_FS_XATTR
905                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
906                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
907 #else
908                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
909                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
910 #endif
911 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
912                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
913                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
914 #else
915                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
916                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
917 #endif
918                 {.option_name = "nolog"},
919                 {"replayonly",.setmask = 1 << REPLAYONLY},
920                 {"block-allocator",.arg_required = 'a',.values = balloc},
921                 {"data",.arg_required = 'd',.values = logging_mode},
922                 {"barrier",.arg_required = 'b',.values = barrier_mode},
923                 {"resize",.arg_required = 'r',.values = NULL},
924                 {"jdev",.arg_required = 'j',.values = NULL},
925                 {"nolargeio",.arg_required = 'w',.values = NULL},
926                 {"commit",.arg_required = 'c',.values = NULL},
927                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
928                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
929                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
930                 {"errors",.arg_required = 'e',.values = error_actions},
931                 {"usrjquota",.arg_required =
932                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
933                 {"grpjquota",.arg_required =
934                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
935                 {"jqfmt",.arg_required = 'f',.values = NULL},
936                 {.option_name = NULL}
937         };
938
939         *blocks = 0;
940         if (!options || !*options)
941                 /* use default configuration: create tails, journaling on, no
942                    conversion to newest format */
943                 return 1;
944
945         for (pos = options; pos;) {
946                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
947                 if (c == -1)
948                         /* wrong option is given */
949                         return 0;
950
951                 if (c == 'r') {
952                         char *p;
953
954                         p = NULL;
955                         /* "resize=NNN" or "resize=auto" */
956
957                         if (!strcmp(arg, "auto")) {
958                                 /* From JFS code, to auto-get the size. */
959                                 *blocks =
960                                     s->s_bdev->bd_inode->i_size >> s->
961                                     s_blocksize_bits;
962                         } else {
963                                 *blocks = simple_strtoul(arg, &p, 0);
964                                 if (*p != '\0') {
965                                         /* NNN does not look like a number */
966                                         reiserfs_warning(s, "super-6507",
967                                                          "bad value %s for "
968                                                          "-oresize\n", arg);
969                                         return 0;
970                                 }
971                         }
972                 }
973
974                 if (c == 'c') {
975                         char *p = NULL;
976                         unsigned long val = simple_strtoul(arg, &p, 0);
977                         /* commit=NNN (time in seconds) */
978                         if (*p != '\0' || val >= (unsigned int)-1) {
979                                 reiserfs_warning(s, "super-6508",
980                                                  "bad value %s for -ocommit\n",
981                                                  arg);
982                                 return 0;
983                         }
984                         *commit_max_age = (unsigned int)val;
985                 }
986
987                 if (c == 'w') {
988                         reiserfs_warning(s, "super-6509", "nolargeio option "
989                                          "is no longer supported");
990                         return 0;
991                 }
992
993                 if (c == 'j') {
994                         if (arg && *arg && jdev_name) {
995                                 if (*jdev_name) {       //Hm, already assigned?
996                                         reiserfs_warning(s, "super-6510",
997                                                          "journal device was "
998                                                          "already specified to "
999                                                          "be %s", *jdev_name);
1000                                         return 0;
1001                                 }
1002                                 *jdev_name = arg;
1003                         }
1004                 }
1005 #ifdef CONFIG_QUOTA
1006                 if (c == 'u' || c == 'g') {
1007                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1008
1009                         if (sb_any_quota_loaded(s) &&
1010                             (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1011                                 reiserfs_warning(s, "super-6511",
1012                                                  "cannot change journaled "
1013                                                  "quota options when quota "
1014                                                  "turned on.");
1015                                 return 0;
1016                         }
1017                         if (*arg) {     /* Some filename specified? */
1018                                 if (REISERFS_SB(s)->s_qf_names[qtype]
1019                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1020                                               arg)) {
1021                                         reiserfs_warning(s, "super-6512",
1022                                                          "%s quota file "
1023                                                          "already specified.",
1024                                                          QTYPE2NAME(qtype));
1025                                         return 0;
1026                                 }
1027                                 if (strchr(arg, '/')) {
1028                                         reiserfs_warning(s, "super-6513",
1029                                                          "quotafile must be "
1030                                                          "on filesystem root.");
1031                                         return 0;
1032                                 }
1033                                 qf_names[qtype] =
1034                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1035                                 if (!qf_names[qtype]) {
1036                                         reiserfs_warning(s, "reiserfs-2502",
1037                                                          "not enough memory "
1038                                                          "for storing "
1039                                                          "quotafile name.");
1040                                         return 0;
1041                                 }
1042                                 strcpy(qf_names[qtype], arg);
1043                                 *mount_options |= 1 << REISERFS_QUOTA;
1044                         } else {
1045                                 if (qf_names[qtype] !=
1046                                     REISERFS_SB(s)->s_qf_names[qtype])
1047                                         kfree(qf_names[qtype]);
1048                                 qf_names[qtype] = NULL;
1049                         }
1050                 }
1051                 if (c == 'f') {
1052                         if (!strcmp(arg, "vfsold"))
1053                                 *qfmt = QFMT_VFS_OLD;
1054                         else if (!strcmp(arg, "vfsv0"))
1055                                 *qfmt = QFMT_VFS_V0;
1056                         else {
1057                                 reiserfs_warning(s, "super-6514",
1058                                                  "unknown quota format "
1059                                                  "specified.");
1060                                 return 0;
1061                         }
1062                         if (sb_any_quota_loaded(s) &&
1063                             *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1064                                 reiserfs_warning(s, "super-6515",
1065                                                  "cannot change journaled "
1066                                                  "quota options when quota "
1067                                                  "turned on.");
1068                                 return 0;
1069                         }
1070                 }
1071 #else
1072                 if (c == 'u' || c == 'g' || c == 'f') {
1073                         reiserfs_warning(s, "reiserfs-2503", "journaled "
1074                                          "quota options not supported.");
1075                         return 0;
1076                 }
1077 #endif
1078         }
1079
1080 #ifdef CONFIG_QUOTA
1081         if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1082             && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1083                 reiserfs_warning(s, "super-6515",
1084                                  "journaled quota format not specified.");
1085                 return 0;
1086         }
1087         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1088         if (!(*mount_options & (1 << REISERFS_QUOTA))
1089             && sb_any_quota_loaded(s)) {
1090                 reiserfs_warning(s, "super-6516", "quota options must "
1091                                  "be present when quota is turned on.");
1092                 return 0;
1093         }
1094 #endif
1095
1096         return 1;
1097 }
1098
1099 static void switch_data_mode(struct super_block *s, unsigned long mode)
1100 {
1101         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1102                                          (1 << REISERFS_DATA_ORDERED) |
1103                                          (1 << REISERFS_DATA_WRITEBACK));
1104         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1105 }
1106
1107 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1108 {
1109         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1110                 if (!reiserfs_data_log(s)) {
1111                         switch_data_mode(s, REISERFS_DATA_LOG);
1112                         reiserfs_info(s, "switching to journaled data mode\n");
1113                 }
1114         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1115                 if (!reiserfs_data_ordered(s)) {
1116                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1117                         reiserfs_info(s, "switching to ordered data mode\n");
1118                 }
1119         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1120                 if (!reiserfs_data_writeback(s)) {
1121                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1122                         reiserfs_info(s, "switching to writeback data mode\n");
1123                 }
1124         }
1125 }
1126
1127 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1128 {
1129         int flush = (1 << REISERFS_BARRIER_FLUSH);
1130         int none = (1 << REISERFS_BARRIER_NONE);
1131         int all_barrier = flush | none;
1132
1133         if (bits & all_barrier) {
1134                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1135                 if (bits & flush) {
1136                         REISERFS_SB(s)->s_mount_opt |= flush;
1137                         printk("reiserfs: enabling write barrier flush mode\n");
1138                 } else if (bits & none) {
1139                         REISERFS_SB(s)->s_mount_opt |= none;
1140                         printk("reiserfs: write barriers turned off\n");
1141                 }
1142         }
1143 }
1144
1145 static void handle_attrs(struct super_block *s)
1146 {
1147         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1148
1149         if (reiserfs_attrs(s)) {
1150                 if (old_format_only(s)) {
1151                         reiserfs_warning(s, "super-6517", "cannot support "
1152                                          "attributes on 3.5.x disk format");
1153                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1154                         return;
1155                 }
1156                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1157                         reiserfs_warning(s, "super-6518", "cannot support "
1158                                          "attributes until flag is set in "
1159                                          "super-block");
1160                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1161                 }
1162         }
1163 }
1164
1165 #ifdef CONFIG_QUOTA
1166 static void handle_quota_files(struct super_block *s, char **qf_names,
1167                                unsigned int *qfmt)
1168 {
1169         int i;
1170
1171         for (i = 0; i < MAXQUOTAS; i++) {
1172                 if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1173                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1174                 REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1175         }
1176         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1177 }
1178 #endif
1179
1180 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1181 {
1182         struct reiserfs_super_block *rs;
1183         struct reiserfs_transaction_handle th;
1184         unsigned long blocks;
1185         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1186         unsigned long safe_mask = 0;
1187         unsigned int commit_max_age = (unsigned int)-1;
1188         struct reiserfs_journal *journal = SB_JOURNAL(s);
1189         char *new_opts = kstrdup(arg, GFP_KERNEL);
1190         int err;
1191         char *qf_names[MAXQUOTAS];
1192         unsigned int qfmt = 0;
1193 #ifdef CONFIG_QUOTA
1194         int i;
1195
1196         memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1197 #endif
1198
1199         rs = SB_DISK_SUPER_BLOCK(s);
1200
1201         if (!reiserfs_parse_options
1202             (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1203             qf_names, &qfmt)) {
1204 #ifdef CONFIG_QUOTA
1205                 for (i = 0; i < MAXQUOTAS; i++)
1206                         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1207                                 kfree(qf_names[i]);
1208 #endif
1209                 err = -EINVAL;
1210                 goto out_err;
1211         }
1212 #ifdef CONFIG_QUOTA
1213         handle_quota_files(s, qf_names, &qfmt);
1214 #endif
1215
1216         handle_attrs(s);
1217
1218         /* Add options that are safe here */
1219         safe_mask |= 1 << REISERFS_SMALLTAIL;
1220         safe_mask |= 1 << REISERFS_LARGETAIL;
1221         safe_mask |= 1 << REISERFS_NO_BORDER;
1222         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1223         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1224         safe_mask |= 1 << REISERFS_TEST4;
1225         safe_mask |= 1 << REISERFS_ATTRS;
1226         safe_mask |= 1 << REISERFS_XATTRS_USER;
1227         safe_mask |= 1 << REISERFS_POSIXACL;
1228         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1229         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1230         safe_mask |= 1 << REISERFS_ERROR_RO;
1231         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1232         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1233         safe_mask |= 1 << REISERFS_QUOTA;
1234
1235         /* Update the bitmask, taking care to keep
1236          * the bits we're not allowed to change here */
1237         REISERFS_SB(s)->s_mount_opt =
1238             (REISERFS_SB(s)->
1239              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1240
1241         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1242                 journal->j_max_commit_age = commit_max_age;
1243                 journal->j_max_trans_age = commit_max_age;
1244         } else if (commit_max_age == 0) {
1245                 /* 0 means restore defaults. */
1246                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1247                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1248         }
1249
1250         if (blocks) {
1251                 err = reiserfs_resize(s, blocks);
1252                 if (err != 0)
1253                         goto out_err;
1254         }
1255
1256         if (*mount_flags & MS_RDONLY) {
1257                 reiserfs_xattr_init(s, *mount_flags);
1258                 /* remount read-only */
1259                 if (s->s_flags & MS_RDONLY)
1260                         /* it is read-only already */
1261                         goto out_ok;
1262                 /* try to remount file system with read-only permissions */
1263                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1264                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1265                         goto out_ok;
1266                 }
1267
1268                 err = journal_begin(&th, s, 10);
1269                 if (err)
1270                         goto out_err;
1271
1272                 /* Mounting a rw partition read-only. */
1273                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1274                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1275                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1276         } else {
1277                 /* remount read-write */
1278                 if (!(s->s_flags & MS_RDONLY)) {
1279                         reiserfs_xattr_init(s, *mount_flags);
1280                         goto out_ok;    /* We are read-write already */
1281                 }
1282
1283                 if (reiserfs_is_journal_aborted(journal)) {
1284                         err = journal->j_errno;
1285                         goto out_err;
1286                 }
1287
1288                 handle_data_mode(s, mount_options);
1289                 handle_barrier_mode(s, mount_options);
1290                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1291                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1292                 err = journal_begin(&th, s, 10);
1293                 if (err)
1294                         goto out_err;
1295
1296                 /* Mount a partition which is read-only, read-write */
1297                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1298                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1299                 s->s_flags &= ~MS_RDONLY;
1300                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1301                 if (!old_format_only(s))
1302                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1303                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1304                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1305                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1306         }
1307         /* this will force a full flush of all journal lists */
1308         SB_JOURNAL(s)->j_must_wait = 1;
1309         err = journal_end(&th, s, 10);
1310         if (err)
1311                 goto out_err;
1312         s->s_dirt = 0;
1313
1314         if (!(*mount_flags & MS_RDONLY)) {
1315                 finish_unfinished(s);
1316                 reiserfs_xattr_init(s, *mount_flags);
1317         }
1318
1319 out_ok:
1320         kfree(s->s_options);
1321         s->s_options = new_opts;
1322         return 0;
1323
1324 out_err:
1325         kfree(new_opts);
1326         return err;
1327 }
1328
1329 static int read_super_block(struct super_block *s, int offset)
1330 {
1331         struct buffer_head *bh;
1332         struct reiserfs_super_block *rs;
1333         int fs_blocksize;
1334
1335         bh = sb_bread(s, offset / s->s_blocksize);
1336         if (!bh) {
1337                 reiserfs_warning(s, "sh-2006",
1338                                  "bread failed (dev %s, block %lu, size %lu)",
1339                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1340                                  s->s_blocksize);
1341                 return 1;
1342         }
1343
1344         rs = (struct reiserfs_super_block *)bh->b_data;
1345         if (!is_any_reiserfs_magic_string(rs)) {
1346                 brelse(bh);
1347                 return 1;
1348         }
1349         //
1350         // ok, reiserfs signature (old or new) found in at the given offset
1351         //    
1352         fs_blocksize = sb_blocksize(rs);
1353         brelse(bh);
1354         sb_set_blocksize(s, fs_blocksize);
1355
1356         bh = sb_bread(s, offset / s->s_blocksize);
1357         if (!bh) {
1358                 reiserfs_warning(s, "sh-2007",
1359                                  "bread failed (dev %s, block %lu, size %lu)",
1360                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1361                                  s->s_blocksize);
1362                 return 1;
1363         }
1364
1365         rs = (struct reiserfs_super_block *)bh->b_data;
1366         if (sb_blocksize(rs) != s->s_blocksize) {
1367                 reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1368                                  "filesystem on (dev %s, block %Lu, size %lu)",
1369                                  reiserfs_bdevname(s),
1370                                  (unsigned long long)bh->b_blocknr,
1371                                  s->s_blocksize);
1372                 brelse(bh);
1373                 return 1;
1374         }
1375
1376         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1377                 brelse(bh);
1378                 reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1379                                  "--rebuild-tree run detected. Please run\n"
1380                                  "reiserfsck --rebuild-tree and wait for a "
1381                                  "completion. If that fails\n"
1382                                  "get newer reiserfsprogs package");
1383                 return 1;
1384         }
1385
1386         SB_BUFFER_WITH_SB(s) = bh;
1387         SB_DISK_SUPER_BLOCK(s) = rs;
1388
1389         if (is_reiserfs_jr(rs)) {
1390                 /* magic is of non-standard journal filesystem, look at s_version to
1391                    find which format is in use */
1392                 if (sb_version(rs) == REISERFS_VERSION_2)
1393                         reiserfs_info(s, "found reiserfs format \"3.6\""
1394                                       " with non-standard journal\n");
1395                 else if (sb_version(rs) == REISERFS_VERSION_1)
1396                         reiserfs_info(s, "found reiserfs format \"3.5\""
1397                                       " with non-standard journal\n");
1398                 else {
1399                         reiserfs_warning(s, "sh-2012", "found unknown "
1400                                          "format \"%u\" of reiserfs with "
1401                                          "non-standard magic", sb_version(rs));
1402                         return 1;
1403                 }
1404         } else
1405                 /* s_version of standard format may contain incorrect information,
1406                    so we just look at the magic string */
1407                 reiserfs_info(s,
1408                               "found reiserfs format \"%s\" with standard journal\n",
1409                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1410
1411         s->s_op = &reiserfs_sops;
1412         s->s_export_op = &reiserfs_export_ops;
1413 #ifdef CONFIG_QUOTA
1414         s->s_qcop = &reiserfs_qctl_operations;
1415         s->dq_op = &reiserfs_quota_operations;
1416 #endif
1417
1418         /* new format is limited by the 32 bit wide i_blocks field, want to
1419          ** be one full block below that.
1420          */
1421         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1422         return 0;
1423 }
1424
1425 /* after journal replay, reread all bitmap and super blocks */
1426 static int reread_meta_blocks(struct super_block *s)
1427 {
1428         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1429         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1430         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1431                 reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1432                 return 1;
1433         }
1434
1435         return 0;
1436 }
1437
1438 /////////////////////////////////////////////////////
1439 // hash detection stuff
1440
1441 // if root directory is empty - we set default - Yura's - hash and
1442 // warn about it
1443 // FIXME: we look for only one name in a directory. If tea and yura
1444 // bith have the same value - we ask user to send report to the
1445 // mailing list
1446 static __u32 find_hash_out(struct super_block *s)
1447 {
1448         int retval;
1449         struct inode *inode;
1450         struct cpu_key key;
1451         INITIALIZE_PATH(path);
1452         struct reiserfs_dir_entry de;
1453         __u32 hash = DEFAULT_HASH;
1454
1455         inode = s->s_root->d_inode;
1456
1457         do {                    // Some serious "goto"-hater was there ;)
1458                 u32 teahash, r5hash, yurahash;
1459
1460                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1461                 retval = search_by_entry_key(s, &key, &path, &de);
1462                 if (retval == IO_ERROR) {
1463                         pathrelse(&path);
1464                         return UNSET_HASH;
1465                 }
1466                 if (retval == NAME_NOT_FOUND)
1467                         de.de_entry_num--;
1468                 set_de_name_and_namelen(&de);
1469                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1470                         /* allow override in this case */
1471                         if (reiserfs_rupasov_hash(s)) {
1472                                 hash = YURA_HASH;
1473                         }
1474                         reiserfs_info(s, "FS seems to be empty, autodetect "
1475                                          "is using the default hash\n");
1476                         break;
1477                 }
1478                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1479                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1480                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1481                 if (((teahash == r5hash)
1482                      &&
1483                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1484                       == r5hash)) || ((teahash == yurahash)
1485                                       && (yurahash ==
1486                                           GET_HASH_VALUE(deh_offset
1487                                                          (&
1488                                                           (de.
1489                                                            de_deh[de.
1490                                                                   de_entry_num])))))
1491                     || ((r5hash == yurahash)
1492                         && (yurahash ==
1493                             GET_HASH_VALUE(deh_offset
1494                                            (&(de.de_deh[de.de_entry_num])))))) {
1495                         reiserfs_warning(s, "reiserfs-2506", "Unable to "
1496                                          "automatically detect hash function. "
1497                                          "Please mount with -o "
1498                                          "hash={tea,rupasov,r5}");
1499                         hash = UNSET_HASH;
1500                         break;
1501                 }
1502                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1503                     yurahash)
1504                         hash = YURA_HASH;
1505                 else if (GET_HASH_VALUE
1506                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1507                         hash = TEA_HASH;
1508                 else if (GET_HASH_VALUE
1509                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1510                         hash = R5_HASH;
1511                 else {
1512                         reiserfs_warning(s, "reiserfs-2506",
1513                                          "Unrecognised hash function");
1514                         hash = UNSET_HASH;
1515                 }
1516         } while (0);
1517
1518         pathrelse(&path);
1519         return hash;
1520 }
1521
1522 // finds out which hash names are sorted with
1523 static int what_hash(struct super_block *s)
1524 {
1525         __u32 code;
1526
1527         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1528
1529         /* reiserfs_hash_detect() == true if any of the hash mount options
1530          ** were used.  We must check them to make sure the user isn't
1531          ** using a bad hash value
1532          */
1533         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1534                 code = find_hash_out(s);
1535
1536         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1537                 /* detection has found the hash, and we must check against the 
1538                  ** mount options 
1539                  */
1540                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1541                         reiserfs_warning(s, "reiserfs-2507",
1542                                          "Error, %s hash detected, "
1543                                          "unable to force rupasov hash",
1544                                          reiserfs_hashname(code));
1545                         code = UNSET_HASH;
1546                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1547                         reiserfs_warning(s, "reiserfs-2508",
1548                                          "Error, %s hash detected, "
1549                                          "unable to force tea hash",
1550                                          reiserfs_hashname(code));
1551                         code = UNSET_HASH;
1552                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1553                         reiserfs_warning(s, "reiserfs-2509",
1554                                          "Error, %s hash detected, "
1555                                          "unable to force r5 hash",
1556                                          reiserfs_hashname(code));
1557                         code = UNSET_HASH;
1558                 }
1559         } else {
1560                 /* find_hash_out was not called or could not determine the hash */
1561                 if (reiserfs_rupasov_hash(s)) {
1562                         code = YURA_HASH;
1563                 } else if (reiserfs_tea_hash(s)) {
1564                         code = TEA_HASH;
1565                 } else if (reiserfs_r5_hash(s)) {
1566                         code = R5_HASH;
1567                 }
1568         }
1569
1570         /* if we are mounted RW, and we have a new valid hash code, update 
1571          ** the super
1572          */
1573         if (code != UNSET_HASH &&
1574             !(s->s_flags & MS_RDONLY) &&
1575             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1576                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1577         }
1578         return code;
1579 }
1580
1581 // return pointer to appropriate function
1582 static hashf_t hash_function(struct super_block *s)
1583 {
1584         switch (what_hash(s)) {
1585         case TEA_HASH:
1586                 reiserfs_info(s, "Using tea hash to sort names\n");
1587                 return keyed_hash;
1588         case YURA_HASH:
1589                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1590                 return yura_hash;
1591         case R5_HASH:
1592                 reiserfs_info(s, "Using r5 hash to sort names\n");
1593                 return r5_hash;
1594         }
1595         return NULL;
1596 }
1597
1598 // this is used to set up correct value for old partitions
1599 static int function2code(hashf_t func)
1600 {
1601         if (func == keyed_hash)
1602                 return TEA_HASH;
1603         if (func == yura_hash)
1604                 return YURA_HASH;
1605         if (func == r5_hash)
1606                 return R5_HASH;
1607
1608         BUG();                  // should never happen
1609
1610         return 0;
1611 }
1612
1613 #define SWARN(silent, s, id, ...)                       \
1614         if (!(silent))                          \
1615                 reiserfs_warning(s, id, __VA_ARGS__)
1616
1617 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1618 {
1619         struct inode *root_inode;
1620         struct reiserfs_transaction_handle th;
1621         int old_format = 0;
1622         unsigned long blocks;
1623         unsigned int commit_max_age = 0;
1624         int jinit_done = 0;
1625         struct reiserfs_iget_args args;
1626         struct reiserfs_super_block *rs;
1627         char *jdev_name;
1628         struct reiserfs_sb_info *sbi;
1629         int errval = -EINVAL;
1630         char *qf_names[MAXQUOTAS] = {};
1631         unsigned int qfmt = 0;
1632
1633         save_mount_options(s, data);
1634
1635         sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1636         if (!sbi) {
1637                 errval = -ENOMEM;
1638                 goto error;
1639         }
1640         s->s_fs_info = sbi;
1641         /* Set default values for options: non-aggressive tails, RO on errors */
1642         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1643         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1644         /* no preallocation minimum, be smart in
1645            reiserfs_file_write instead */
1646         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1647         /* Preallocate by 16 blocks (17-1) at once */
1648         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1649         /* setup default block allocator options */
1650         reiserfs_init_alloc_options(s);
1651
1652         jdev_name = NULL;
1653         if (reiserfs_parse_options
1654             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1655              &commit_max_age, qf_names, &qfmt) == 0) {
1656                 goto error;
1657         }
1658 #ifdef CONFIG_QUOTA
1659         handle_quota_files(s, qf_names, &qfmt);
1660 #endif
1661
1662         if (blocks) {
1663                 SWARN(silent, s, "jmacd-7", "resize option for remount only");
1664                 goto error;
1665         }
1666
1667         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1668         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1669                 old_format = 1;
1670         /* try new format (64-th 1k block), which can contain reiserfs super block */
1671         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1672                 SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1673                       reiserfs_bdevname(s));
1674                 goto error;
1675         }
1676
1677         rs = SB_DISK_SUPER_BLOCK(s);
1678         /* Let's do basic sanity check to verify that underlying device is not
1679            smaller than the filesystem. If the check fails then abort and scream,
1680            because bad stuff will happen otherwise. */
1681         if (s->s_bdev && s->s_bdev->bd_inode
1682             && i_size_read(s->s_bdev->bd_inode) <
1683             sb_block_count(rs) * sb_blocksize(rs)) {
1684                 SWARN(silent, s, "", "Filesystem cannot be "
1685                       "mounted because it is bigger than the device");
1686                 SWARN(silent, s, "", "You may need to run fsck "
1687                       "or increase size of your LVM partition");
1688                 SWARN(silent, s, "", "Or may be you forgot to "
1689                       "reboot after fdisk when it told you to");
1690                 goto error;
1691         }
1692
1693         sbi->s_mount_state = SB_REISERFS_STATE(s);
1694         sbi->s_mount_state = REISERFS_VALID_FS;
1695
1696         if ((errval = reiserfs_init_bitmap_cache(s))) {
1697                 SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1698                 goto error;
1699         }
1700         errval = -EINVAL;
1701 #ifdef CONFIG_REISERFS_CHECK
1702         SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1703         SWARN(silent, s, "", "- it is slow mode for debugging.");
1704 #endif
1705
1706         /* make data=ordered the default */
1707         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1708             !reiserfs_data_writeback(s)) {
1709                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1710         }
1711
1712         if (reiserfs_data_log(s)) {
1713                 reiserfs_info(s, "using journaled data mode\n");
1714         } else if (reiserfs_data_ordered(s)) {
1715                 reiserfs_info(s, "using ordered data mode\n");
1716         } else {
1717                 reiserfs_info(s, "using writeback data mode\n");
1718         }
1719         if (reiserfs_barrier_flush(s)) {
1720                 printk("reiserfs: using flush barriers\n");
1721         }
1722         // set_device_ro(s->s_dev, 1) ;
1723         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1724                 SWARN(silent, s, "sh-2022",
1725                       "unable to initialize journal space");
1726                 goto error;
1727         } else {
1728                 jinit_done = 1; /* once this is set, journal_release must be called
1729                                  ** if we error out of the mount
1730                                  */
1731         }
1732         if (reread_meta_blocks(s)) {
1733                 SWARN(silent, s, "jmacd-9",
1734                       "unable to reread meta blocks after journal init");
1735                 goto error;
1736         }
1737
1738         if (replay_only(s))
1739                 goto error;
1740
1741         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1742                 SWARN(silent, s, "clm-7000",
1743                       "Detected readonly device, marking FS readonly");
1744                 s->s_flags |= MS_RDONLY;
1745         }
1746         args.objectid = REISERFS_ROOT_OBJECTID;
1747         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1748         root_inode =
1749             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1750                          reiserfs_init_locked_inode, (void *)(&args));
1751         if (!root_inode) {
1752                 SWARN(silent, s, "jmacd-10", "get root inode failed");
1753                 goto error;
1754         }
1755
1756         if (root_inode->i_state & I_NEW) {
1757                 reiserfs_read_locked_inode(root_inode, &args);
1758                 unlock_new_inode(root_inode);
1759         }
1760
1761         s->s_root = d_alloc_root(root_inode);
1762         if (!s->s_root) {
1763                 iput(root_inode);
1764                 goto error;
1765         }
1766         // define and initialize hash function
1767         sbi->s_hash_function = hash_function(s);
1768         if (sbi->s_hash_function == NULL) {
1769                 dput(s->s_root);
1770                 s->s_root = NULL;
1771                 goto error;
1772         }
1773
1774         if (is_reiserfs_3_5(rs)
1775             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1776                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1777         else if (old_format)
1778                 set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1779         else
1780                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1781
1782         if (!(s->s_flags & MS_RDONLY)) {
1783
1784                 errval = journal_begin(&th, s, 1);
1785                 if (errval) {
1786                         dput(s->s_root);
1787                         s->s_root = NULL;
1788                         goto error;
1789                 }
1790                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1791
1792                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1793                 set_sb_fs_state(rs, 0);
1794
1795                 /* Clear out s_bmap_nr if it would wrap. We can handle this
1796                  * case, but older revisions can't. This will cause the
1797                  * file system to fail mount on those older implementations,
1798                  * avoiding corruption. -jeffm */
1799                 if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1800                     sb_bmap_nr(rs) != 0) {
1801                         reiserfs_warning(s, "super-2030", "This file system "
1802                                         "claims to use %u bitmap blocks in "
1803                                         "its super block, but requires %u. "
1804                                         "Clearing to zero.", sb_bmap_nr(rs),
1805                                         reiserfs_bmap_count(s));
1806
1807                         set_sb_bmap_nr(rs, 0);
1808                 }
1809
1810                 if (old_format_only(s)) {
1811                         /* filesystem of format 3.5 either with standard or non-standard
1812                            journal */
1813                         if (convert_reiserfs(s)) {
1814                                 /* and -o conv is given */
1815                                 if (!silent)
1816                                         reiserfs_info(s,
1817                                                       "converting 3.5 filesystem to the 3.6 format");
1818
1819                                 if (is_reiserfs_3_5(rs))
1820                                         /* put magic string of 3.6 format. 2.2 will not be able to
1821                                            mount this filesystem anymore */
1822                                         memcpy(rs->s_v1.s_magic,
1823                                                reiserfs_3_6_magic_string,
1824                                                sizeof
1825                                                (reiserfs_3_6_magic_string));
1826
1827                                 set_sb_version(rs, REISERFS_VERSION_2);
1828                                 reiserfs_convert_objectid_map_v1(s);
1829                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1830                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1831                         } else if (!silent) {
1832                                 reiserfs_info(s, "using 3.5.x disk format\n");
1833                         }
1834                 } else
1835                         set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1836
1837
1838                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1839                 errval = journal_end(&th, s, 1);
1840                 if (errval) {
1841                         dput(s->s_root);
1842                         s->s_root = NULL;
1843                         goto error;
1844                 }
1845
1846                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1847                         dput(s->s_root);
1848                         s->s_root = NULL;
1849                         goto error;
1850                 }
1851
1852                 /* look for files which were to be removed in previous session */
1853                 finish_unfinished(s);
1854         } else {
1855                 if (old_format_only(s) && !silent) {
1856                         reiserfs_info(s, "using 3.5.x disk format\n");
1857                 }
1858
1859                 if ((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         return (0);
1876
1877 error:
1878         if (jinit_done) {       /* kill the commit thread, free journal ram */
1879                 journal_release_error(NULL, s);
1880         }
1881
1882         reiserfs_free_bitmap_cache(s);
1883         if (SB_BUFFER_WITH_SB(s))
1884                 brelse(SB_BUFFER_WITH_SB(s));
1885 #ifdef CONFIG_QUOTA
1886         {
1887                 int j;
1888                 for (j = 0; j < MAXQUOTAS; j++)
1889                         kfree(qf_names[j]);
1890         }
1891 #endif
1892         kfree(sbi);
1893
1894         s->s_fs_info = NULL;
1895         return errval;
1896 }
1897
1898 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1899 {
1900         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1901
1902         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1903         buf->f_bfree = sb_free_blocks(rs);
1904         buf->f_bavail = buf->f_bfree;
1905         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1906         buf->f_bsize = dentry->d_sb->s_blocksize;
1907         /* changed to accommodate gcc folks. */
1908         buf->f_type = REISERFS_SUPER_MAGIC;
1909         return 0;
1910 }
1911
1912 #ifdef CONFIG_QUOTA
1913 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1914 {
1915         struct reiserfs_transaction_handle th;
1916         int ret, err;
1917
1918         /* We may create quota structure so we need to reserve enough blocks */
1919         reiserfs_write_lock(inode->i_sb);
1920         ret =
1921             journal_begin(&th, inode->i_sb,
1922                           2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1923         if (ret)
1924                 goto out;
1925         ret = dquot_initialize(inode, type);
1926         err =
1927             journal_end(&th, inode->i_sb,
1928                         2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1929         if (!ret && err)
1930                 ret = err;
1931       out:
1932         reiserfs_write_unlock(inode->i_sb);
1933         return ret;
1934 }
1935
1936 static int reiserfs_dquot_drop(struct inode *inode)
1937 {
1938         struct reiserfs_transaction_handle th;
1939         int ret, err;
1940
1941         /* We may delete quota structure so we need to reserve enough blocks */
1942         reiserfs_write_lock(inode->i_sb);
1943         ret =
1944             journal_begin(&th, inode->i_sb,
1945                           2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1946         if (ret) {
1947                 /*
1948                  * We call dquot_drop() anyway to at least release references
1949                  * to quota structures so that umount does not hang.
1950                  */
1951                 dquot_drop(inode);
1952                 goto out;
1953         }
1954         ret = dquot_drop(inode);
1955         err =
1956             journal_end(&th, inode->i_sb,
1957                         2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1958         if (!ret && err)
1959                 ret = err;
1960       out:
1961         reiserfs_write_unlock(inode->i_sb);
1962         return ret;
1963 }
1964
1965 static int reiserfs_write_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_TRANS_BLOCKS(dquot->dq_sb));
1974         if (ret)
1975                 goto out;
1976         ret = dquot_commit(dquot);
1977         err =
1978             journal_end(&th, dquot->dq_sb,
1979                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1980         if (!ret && err)
1981                 ret = err;
1982       out:
1983         reiserfs_write_unlock(dquot->dq_sb);
1984         return ret;
1985 }
1986
1987 static int reiserfs_acquire_dquot(struct dquot *dquot)
1988 {
1989         struct reiserfs_transaction_handle th;
1990         int ret, err;
1991
1992         reiserfs_write_lock(dquot->dq_sb);
1993         ret =
1994             journal_begin(&th, dquot->dq_sb,
1995                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1996         if (ret)
1997                 goto out;
1998         ret = dquot_acquire(dquot);
1999         err =
2000             journal_end(&th, dquot->dq_sb,
2001                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2002         if (!ret && err)
2003                 ret = err;
2004       out:
2005         reiserfs_write_unlock(dquot->dq_sb);
2006         return ret;
2007 }
2008
2009 static int reiserfs_release_dquot(struct dquot *dquot)
2010 {
2011         struct reiserfs_transaction_handle th;
2012         int ret, err;
2013
2014         reiserfs_write_lock(dquot->dq_sb);
2015         ret =
2016             journal_begin(&th, dquot->dq_sb,
2017                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2018         if (ret) {
2019                 /* Release dquot anyway to avoid endless cycle in dqput() */
2020                 dquot_release(dquot);
2021                 goto out;
2022         }
2023         ret = dquot_release(dquot);
2024         err =
2025             journal_end(&th, dquot->dq_sb,
2026                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2027         if (!ret && err)
2028                 ret = err;
2029       out:
2030         reiserfs_write_unlock(dquot->dq_sb);
2031         return ret;
2032 }
2033
2034 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2035 {
2036         /* Are we journaling quotas? */
2037         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2038             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2039                 dquot_mark_dquot_dirty(dquot);
2040                 return reiserfs_write_dquot(dquot);
2041         } else
2042                 return dquot_mark_dquot_dirty(dquot);
2043 }
2044
2045 static int reiserfs_write_info(struct super_block *sb, int type)
2046 {
2047         struct reiserfs_transaction_handle th;
2048         int ret, err;
2049
2050         /* Data block + inode block */
2051         reiserfs_write_lock(sb);
2052         ret = journal_begin(&th, sb, 2);
2053         if (ret)
2054                 goto out;
2055         ret = dquot_commit_info(sb, type);
2056         err = journal_end(&th, sb, 2);
2057         if (!ret && err)
2058                 ret = err;
2059       out:
2060         reiserfs_write_unlock(sb);
2061         return ret;
2062 }
2063
2064 /*
2065  * Turn on quotas during mount time - we need to find the quota file and such...
2066  */
2067 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2068 {
2069         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2070                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2071 }
2072
2073 /*
2074  * Standard function to be called on quota_on
2075  */
2076 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2077                              char *name, int remount)
2078 {
2079         int err;
2080         struct path path;
2081         struct inode *inode;
2082         struct reiserfs_transaction_handle th;
2083
2084         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2085                 return -EINVAL;
2086         /* No more checks needed? Path and format_id are bogus anyway... */
2087         if (remount)
2088                 return vfs_quota_on(sb, type, format_id, name, 1);
2089         err = kern_path(name, LOOKUP_FOLLOW, &path);
2090         if (err)
2091                 return err;
2092         /* Quotafile not on the same filesystem? */
2093         if (path.mnt->mnt_sb != sb) {
2094                 err = -EXDEV;
2095                 goto out;
2096         }
2097         inode = path.dentry->d_inode;
2098         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2099         if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2100                 err = reiserfs_unpack(inode, NULL);
2101                 if (err) {
2102                         reiserfs_warning(sb, "super-6520",
2103                                 "Unpacking tail of quota file failed"
2104                                 " (%d). Cannot turn on quotas.", err);
2105                         err = -EINVAL;
2106                         goto out;
2107                 }
2108                 mark_inode_dirty(inode);
2109         }
2110         /* Journaling quota? */
2111         if (REISERFS_SB(sb)->s_qf_names[type]) {
2112                 /* Quotafile not of fs root? */
2113                 if (path.dentry->d_parent != sb->s_root)
2114                         reiserfs_warning(sb, "super-6521",
2115                                  "Quota file not on filesystem root. "
2116                                  "Journalled quota will not work.");
2117         }
2118
2119         /*
2120          * When we journal data on quota file, we have to flush journal to see
2121          * all updates to the file when we bypass pagecache...
2122          */
2123         if (reiserfs_file_data_log(inode)) {
2124                 /* Just start temporary transaction and finish it */
2125                 err = journal_begin(&th, sb, 1);
2126                 if (err)
2127                         goto out;
2128                 err = journal_end_sync(&th, sb, 1);
2129                 if (err)
2130                         goto out;
2131         }
2132         err = vfs_quota_on_path(sb, type, format_id, &path);
2133 out:
2134         path_put(&path);
2135         return err;
2136 }
2137
2138 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2139  * acquiring the locks... As quota files are never truncated and quota code
2140  * itself serializes the operations (and noone else should touch the files)
2141  * we don't have to be afraid of races */
2142 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2143                                    size_t len, loff_t off)
2144 {
2145         struct inode *inode = sb_dqopt(sb)->files[type];
2146         unsigned long blk = off >> sb->s_blocksize_bits;
2147         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2148         size_t toread;
2149         struct buffer_head tmp_bh, *bh;
2150         loff_t i_size = i_size_read(inode);
2151
2152         if (off > i_size)
2153                 return 0;
2154         if (off + len > i_size)
2155                 len = i_size - off;
2156         toread = len;
2157         while (toread > 0) {
2158                 tocopy =
2159                     sb->s_blocksize - offset <
2160                     toread ? sb->s_blocksize - offset : toread;
2161                 tmp_bh.b_state = 0;
2162                 /* Quota files are without tails so we can safely use this function */
2163                 reiserfs_write_lock(sb);
2164                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2165                 reiserfs_write_unlock(sb);
2166                 if (err)
2167                         return err;
2168                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2169                         memset(data, 0, tocopy);
2170                 else {
2171                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2172                         if (!bh)
2173                                 return -EIO;
2174                         memcpy(data, bh->b_data + offset, tocopy);
2175                         brelse(bh);
2176                 }
2177                 offset = 0;
2178                 toread -= tocopy;
2179                 data += tocopy;
2180                 blk++;
2181         }
2182         return len;
2183 }
2184
2185 /* Write to quotafile (we know the transaction is already started and has
2186  * enough credits) */
2187 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2188                                     const char *data, size_t len, loff_t off)
2189 {
2190         struct inode *inode = sb_dqopt(sb)->files[type];
2191         unsigned long blk = off >> sb->s_blocksize_bits;
2192         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2193         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2194         size_t towrite = len;
2195         struct buffer_head tmp_bh, *bh;
2196
2197         if (!current->journal_info) {
2198                 printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2199                         " cancelled because transaction is not started.\n",
2200                         (unsigned long long)off, (unsigned long long)len);
2201                 return -EIO;
2202         }
2203         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2204         while (towrite > 0) {
2205                 tocopy = sb->s_blocksize - offset < towrite ?
2206                     sb->s_blocksize - offset : towrite;
2207                 tmp_bh.b_state = 0;
2208                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2209                 if (err)
2210                         goto out;
2211                 if (offset || tocopy != sb->s_blocksize)
2212                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2213                 else
2214                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2215                 if (!bh) {
2216                         err = -EIO;
2217                         goto out;
2218                 }
2219                 lock_buffer(bh);
2220                 memcpy(bh->b_data + offset, data, tocopy);
2221                 flush_dcache_page(bh->b_page);
2222                 set_buffer_uptodate(bh);
2223                 unlock_buffer(bh);
2224                 reiserfs_prepare_for_journal(sb, bh, 1);
2225                 journal_mark_dirty(current->journal_info, sb, bh);
2226                 if (!journal_quota)
2227                         reiserfs_add_ordered_list(inode, bh);
2228                 brelse(bh);
2229                 offset = 0;
2230                 towrite -= tocopy;
2231                 data += tocopy;
2232                 blk++;
2233         }
2234 out:
2235         if (len == towrite) {
2236                 mutex_unlock(&inode->i_mutex);
2237                 return err;
2238         }
2239         if (inode->i_size < off + len - towrite)
2240                 i_size_write(inode, off + len - towrite);
2241         inode->i_version++;
2242         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2243         mark_inode_dirty(inode);
2244         mutex_unlock(&inode->i_mutex);
2245         return len - towrite;
2246 }
2247
2248 #endif
2249
2250 static int get_super_block(struct file_system_type *fs_type,
2251                            int flags, const char *dev_name,
2252                            void *data, struct vfsmount *mnt)
2253 {
2254         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2255                            mnt);
2256 }
2257
2258 static int __init init_reiserfs_fs(void)
2259 {
2260         int ret;
2261
2262         if ((ret = init_inodecache())) {
2263                 return ret;
2264         }
2265
2266         if ((ret = reiserfs_xattr_register_handlers()))
2267                 goto failed_reiserfs_xattr_register_handlers;
2268
2269         reiserfs_proc_info_global_init();
2270         reiserfs_proc_register_global("version",
2271                                       reiserfs_global_version_in_proc);
2272
2273         ret = register_filesystem(&reiserfs_fs_type);
2274
2275         if (ret == 0) {
2276                 return 0;
2277         }
2278
2279         reiserfs_xattr_unregister_handlers();
2280
2281       failed_reiserfs_xattr_register_handlers:
2282         reiserfs_proc_unregister_global("version");
2283         reiserfs_proc_info_global_done();
2284         destroy_inodecache();
2285
2286         return ret;
2287 }
2288
2289 static void __exit exit_reiserfs_fs(void)
2290 {
2291         reiserfs_xattr_unregister_handlers();
2292         reiserfs_proc_unregister_global("version");
2293         reiserfs_proc_info_global_done();
2294         unregister_filesystem(&reiserfs_fs_type);
2295         destroy_inodecache();
2296 }
2297
2298 struct file_system_type reiserfs_fs_type = {
2299         .owner = THIS_MODULE,
2300         .name = "reiserfs",
2301         .get_sb = get_super_block,
2302         .kill_sb = reiserfs_kill_sb,
2303         .fs_flags = FS_REQUIRES_DEV,
2304 };
2305
2306 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2307 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2308 MODULE_LICENSE("GPL");
2309
2310 module_init(init_reiserfs_fs);
2311 module_exit(exit_reiserfs_fs);