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