[PATCH] lockdep: annotate the quota code
[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                 ei->i_acl_access = NULL;
514                 ei->i_acl_default = NULL;
515         }
516 }
517
518 static int init_inodecache(void)
519 {
520         reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
521                                                   sizeof(struct
522                                                          reiserfs_inode_info),
523                                                   0, (SLAB_RECLAIM_ACCOUNT|
524                                                         SLAB_MEM_SPREAD),
525                                                   init_once, NULL);
526         if (reiserfs_inode_cachep == NULL)
527                 return -ENOMEM;
528         return 0;
529 }
530
531 static void destroy_inodecache(void)
532 {
533         if (kmem_cache_destroy(reiserfs_inode_cachep))
534                 reiserfs_warning(NULL,
535                                  "reiserfs_inode_cache: not all structures were freed");
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 static void reiserfs_clear_inode(struct inode *inode)
566 {
567         struct posix_acl *acl;
568
569         acl = REISERFS_I(inode)->i_acl_access;
570         if (acl && !IS_ERR(acl))
571                 posix_acl_release(acl);
572         REISERFS_I(inode)->i_acl_access = NULL;
573
574         acl = REISERFS_I(inode)->i_acl_default;
575         if (acl && !IS_ERR(acl))
576                 posix_acl_release(acl);
577         REISERFS_I(inode)->i_acl_default = NULL;
578 }
579
580 #ifdef CONFIG_QUOTA
581 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
582                                     size_t, loff_t);
583 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
584                                    loff_t);
585 #endif
586
587 static struct super_operations reiserfs_sops = {
588         .alloc_inode = reiserfs_alloc_inode,
589         .destroy_inode = reiserfs_destroy_inode,
590         .write_inode = reiserfs_write_inode,
591         .dirty_inode = reiserfs_dirty_inode,
592         .delete_inode = reiserfs_delete_inode,
593         .clear_inode = reiserfs_clear_inode,
594         .put_super = reiserfs_put_super,
595         .write_super = reiserfs_write_super,
596         .sync_fs = reiserfs_sync_fs,
597         .write_super_lockfs = reiserfs_write_super_lockfs,
598         .unlockfs = reiserfs_unlockfs,
599         .statfs = reiserfs_statfs,
600         .remount_fs = reiserfs_remount,
601 #ifdef CONFIG_QUOTA
602         .quota_read = reiserfs_quota_read,
603         .quota_write = reiserfs_quota_write,
604 #endif
605 };
606
607 #ifdef CONFIG_QUOTA
608 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
609
610 static int reiserfs_dquot_initialize(struct inode *, int);
611 static int reiserfs_dquot_drop(struct inode *);
612 static int reiserfs_write_dquot(struct dquot *);
613 static int reiserfs_acquire_dquot(struct dquot *);
614 static int reiserfs_release_dquot(struct dquot *);
615 static int reiserfs_mark_dquot_dirty(struct dquot *);
616 static int reiserfs_write_info(struct super_block *, int);
617 static int reiserfs_quota_on(struct super_block *, int, int, char *);
618
619 static struct dquot_operations reiserfs_quota_operations = {
620         .initialize = reiserfs_dquot_initialize,
621         .drop = reiserfs_dquot_drop,
622         .alloc_space = dquot_alloc_space,
623         .alloc_inode = dquot_alloc_inode,
624         .free_space = dquot_free_space,
625         .free_inode = dquot_free_inode,
626         .transfer = dquot_transfer,
627         .write_dquot = reiserfs_write_dquot,
628         .acquire_dquot = reiserfs_acquire_dquot,
629         .release_dquot = reiserfs_release_dquot,
630         .mark_dirty = reiserfs_mark_dquot_dirty,
631         .write_info = reiserfs_write_info,
632 };
633
634 static struct quotactl_ops reiserfs_qctl_operations = {
635         .quota_on = reiserfs_quota_on,
636         .quota_off = vfs_quota_off,
637         .quota_sync = vfs_quota_sync,
638         .get_info = vfs_get_dqinfo,
639         .set_info = vfs_set_dqinfo,
640         .get_dqblk = vfs_get_dqblk,
641         .set_dqblk = vfs_set_dqblk,
642 };
643 #endif
644
645 static struct export_operations reiserfs_export_ops = {
646         .encode_fh = reiserfs_encode_fh,
647         .decode_fh = reiserfs_decode_fh,
648         .get_parent = reiserfs_get_parent,
649         .get_dentry = reiserfs_get_dentry,
650 };
651
652 /* this struct is used in reiserfs_getopt () for containing the value for those
653    mount options that have values rather than being toggles. */
654 typedef struct {
655         char *value;
656         int setmask;            /* bitmask which is to set on mount_options bitmask when this
657                                    value is found, 0 is no bits are to be changed. */
658         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
659                                    value is found, 0 is no bits are to be changed. This is
660                                    applied BEFORE setmask */
661 } arg_desc_t;
662
663 /* Set this bit in arg_required to allow empty arguments */
664 #define REISERFS_OPT_ALLOWEMPTY 31
665
666 /* this struct is used in reiserfs_getopt() for describing the set of reiserfs
667    mount options */
668 typedef struct {
669         char *option_name;
670         int arg_required;       /* 0 if argument is not required, not 0 otherwise */
671         const arg_desc_t *values;       /* list of values accepted by an option */
672         int setmask;            /* bitmask which is to set on mount_options bitmask when this
673                                    value is found, 0 is no bits are to be changed. */
674         int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
675                                    value is found, 0 is no bits are to be changed. This is
676                                    applied BEFORE setmask */
677 } opt_desc_t;
678
679 /* possible values for -o data= */
680 static const arg_desc_t logging_mode[] = {
681         {"ordered", 1 << REISERFS_DATA_ORDERED,
682          (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
683         {"journal", 1 << REISERFS_DATA_LOG,
684          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
685         {"writeback", 1 << REISERFS_DATA_WRITEBACK,
686          (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
687         {.value = NULL}
688 };
689
690 /* possible values for -o barrier= */
691 static const arg_desc_t barrier_mode[] = {
692         {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
693         {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
694         {.value = NULL}
695 };
696
697 /* possible values for "-o block-allocator=" and bits which are to be set in
698    s_mount_opt of reiserfs specific part of in-core super block */
699 static const arg_desc_t balloc[] = {
700         {"noborder", 1 << REISERFS_NO_BORDER, 0},
701         {"border", 0, 1 << REISERFS_NO_BORDER},
702         {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
703         {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
704         {"test4", 1 << REISERFS_TEST4, 0},
705         {"notest4", 0, 1 << REISERFS_TEST4},
706         {NULL, 0, 0}
707 };
708
709 static const arg_desc_t tails[] = {
710         {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
711         {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
712         {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
713         {NULL, 0, 0}
714 };
715
716 static const arg_desc_t error_actions[] = {
717         {"panic", 1 << REISERFS_ERROR_PANIC,
718          (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
719         {"ro-remount", 1 << REISERFS_ERROR_RO,
720          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
721 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
722         {"continue", 1 << REISERFS_ERROR_CONTINUE,
723          (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
724 #endif
725         {NULL, 0, 0},
726 };
727
728 int reiserfs_default_io_size = 128 * 1024;      /* Default recommended I/O size is 128k.
729                                                    There might be broken applications that are
730                                                    confused by this. Use nolargeio mount option
731                                                    to get usual i/o size = PAGE_SIZE.
732                                                  */
733
734 /* proceed only one option from a list *cur - string containing of mount options
735    opts - array of options which are accepted
736    opt_arg - if option is found and requires an argument and if it is specifed
737    in the input - pointer to the argument is stored here
738    bit_flags - if option requires to set a certain bit - it is set here
739    return -1 if unknown option is found, opt->arg_required otherwise */
740 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
741                            char **opt_arg, unsigned long *bit_flags)
742 {
743         char *p;
744         /* foo=bar, 
745            ^   ^  ^
746            |   |  +-- option_end
747            |   +-- arg_start
748            +-- option_start
749          */
750         const opt_desc_t *opt;
751         const arg_desc_t *arg;
752
753         p = *cur;
754
755         /* assume argument cannot contain commas */
756         *cur = strchr(p, ',');
757         if (*cur) {
758                 *(*cur) = '\0';
759                 (*cur)++;
760         }
761
762         if (!strncmp(p, "alloc=", 6)) {
763                 /* Ugly special case, probably we should redo options parser so that
764                    it can understand several arguments for some options, also so that
765                    it can fill several bitfields with option values. */
766                 if (reiserfs_parse_alloc_options(s, p + 6)) {
767                         return -1;
768                 } else {
769                         return 0;
770                 }
771         }
772
773         /* for every option in the list */
774         for (opt = opts; opt->option_name; opt++) {
775                 if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
776                         if (bit_flags) {
777                                 if (opt->clrmask ==
778                                     (1 << REISERFS_UNSUPPORTED_OPT))
779                                         reiserfs_warning(s, "%s not supported.",
780                                                          p);
781                                 else
782                                         *bit_flags &= ~opt->clrmask;
783                                 if (opt->setmask ==
784                                     (1 << REISERFS_UNSUPPORTED_OPT))
785                                         reiserfs_warning(s, "%s not supported.",
786                                                          p);
787                                 else
788                                         *bit_flags |= opt->setmask;
789                         }
790                         break;
791                 }
792         }
793         if (!opt->option_name) {
794                 reiserfs_warning(s, "unknown mount option \"%s\"", p);
795                 return -1;
796         }
797
798         p += strlen(opt->option_name);
799         switch (*p) {
800         case '=':
801                 if (!opt->arg_required) {
802                         reiserfs_warning(s,
803                                          "the option \"%s\" does not require an argument",
804                                          opt->option_name);
805                         return -1;
806                 }
807                 break;
808
809         case 0:
810                 if (opt->arg_required) {
811                         reiserfs_warning(s,
812                                          "the option \"%s\" requires an argument",
813                                          opt->option_name);
814                         return -1;
815                 }
816                 break;
817         default:
818                 reiserfs_warning(s, "head of option \"%s\" is only correct",
819                                  opt->option_name);
820                 return -1;
821         }
822
823         /* move to the argument, or to next option if argument is not required */
824         p++;
825
826         if (opt->arg_required
827             && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
828             && !strlen(p)) {
829                 /* this catches "option=," if not allowed */
830                 reiserfs_warning(s, "empty argument for \"%s\"",
831                                  opt->option_name);
832                 return -1;
833         }
834
835         if (!opt->values) {
836                 /* *=NULLopt_arg contains pointer to argument */
837                 *opt_arg = p;
838                 return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
839         }
840
841         /* values possible for this option are listed in opt->values */
842         for (arg = opt->values; arg->value; arg++) {
843                 if (!strcmp(p, arg->value)) {
844                         if (bit_flags) {
845                                 *bit_flags &= ~arg->clrmask;
846                                 *bit_flags |= arg->setmask;
847                         }
848                         return opt->arg_required;
849                 }
850         }
851
852         reiserfs_warning(s, "bad value \"%s\" for option \"%s\"", p,
853                          opt->option_name);
854         return -1;
855 }
856
857 /* returns 0 if something is wrong in option string, 1 - otherwise */
858 static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
859                                   unsigned long *mount_options,
860                                   /* after the parsing phase, contains the
861                                      collection of bitflags defining what
862                                      mount options were selected. */
863                                   unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
864                                   char **jdev_name,
865                                   unsigned int *commit_max_age)
866 {
867         int c;
868         char *arg = NULL;
869         char *pos;
870         opt_desc_t opts[] = {
871                 /* Compatibility stuff, so that -o notail for old setups still work */
872                 {"tails",.arg_required = 't',.values = tails},
873                 {"notail",.clrmask =
874                  (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
875                 {"conv",.setmask = 1 << REISERFS_CONVERT},
876                 {"attrs",.setmask = 1 << REISERFS_ATTRS},
877                 {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
878 #ifdef CONFIG_REISERFS_FS_XATTR
879                 {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
880                 {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
881 #else
882                 {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
883                 {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
884 #endif
885 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
886                 {"acl",.setmask = 1 << REISERFS_POSIXACL},
887                 {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
888 #else
889                 {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
890                 {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
891 #endif
892                 {.option_name = "nolog"},
893                 {"replayonly",.setmask = 1 << REPLAYONLY},
894                 {"block-allocator",.arg_required = 'a',.values = balloc},
895                 {"data",.arg_required = 'd',.values = logging_mode},
896                 {"barrier",.arg_required = 'b',.values = barrier_mode},
897                 {"resize",.arg_required = 'r',.values = NULL},
898                 {"jdev",.arg_required = 'j',.values = NULL},
899                 {"nolargeio",.arg_required = 'w',.values = NULL},
900                 {"commit",.arg_required = 'c',.values = NULL},
901                 {"usrquota",.setmask = 1 << REISERFS_QUOTA},
902                 {"grpquota",.setmask = 1 << REISERFS_QUOTA},
903                 {"noquota",.clrmask = 1 << REISERFS_QUOTA},
904                 {"errors",.arg_required = 'e',.values = error_actions},
905                 {"usrjquota",.arg_required =
906                  'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
907                 {"grpjquota",.arg_required =
908                  'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
909                 {"jqfmt",.arg_required = 'f',.values = NULL},
910                 {.option_name = NULL}
911         };
912
913         *blocks = 0;
914         if (!options || !*options)
915                 /* use default configuration: create tails, journaling on, no
916                    conversion to newest format */
917                 return 1;
918
919         for (pos = options; pos;) {
920                 c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
921                 if (c == -1)
922                         /* wrong option is given */
923                         return 0;
924
925                 if (c == 'r') {
926                         char *p;
927
928                         p = NULL;
929                         /* "resize=NNN" or "resize=auto" */
930
931                         if (!strcmp(arg, "auto")) {
932                                 /* From JFS code, to auto-get the size. */
933                                 *blocks =
934                                     s->s_bdev->bd_inode->i_size >> s->
935                                     s_blocksize_bits;
936                         } else {
937                                 *blocks = simple_strtoul(arg, &p, 0);
938                                 if (*p != '\0') {
939                                         /* NNN does not look like a number */
940                                         reiserfs_warning(s,
941                                                          "reiserfs_parse_options: bad value %s",
942                                                          arg);
943                                         return 0;
944                                 }
945                         }
946                 }
947
948                 if (c == 'c') {
949                         char *p = NULL;
950                         unsigned long val = simple_strtoul(arg, &p, 0);
951                         /* commit=NNN (time in seconds) */
952                         if (*p != '\0' || val >= (unsigned int)-1) {
953                                 reiserfs_warning(s,
954                                                  "reiserfs_parse_options: bad value %s",
955                                                  arg);
956                                 return 0;
957                         }
958                         *commit_max_age = (unsigned int)val;
959                 }
960
961                 if (c == 'w') {
962                         char *p = NULL;
963                         int val = simple_strtoul(arg, &p, 0);
964
965                         if (*p != '\0') {
966                                 reiserfs_warning(s,
967                                                  "reiserfs_parse_options: non-numeric value %s for nolargeio option",
968                                                  arg);
969                                 return 0;
970                         }
971                         if (val)
972                                 reiserfs_default_io_size = PAGE_SIZE;
973                         else
974                                 reiserfs_default_io_size = 128 * 1024;
975                 }
976
977                 if (c == 'j') {
978                         if (arg && *arg && jdev_name) {
979                                 if (*jdev_name) {       //Hm, already assigned?
980                                         reiserfs_warning(s,
981                                                          "reiserfs_parse_options: journal device was already  specified to be %s",
982                                                          *jdev_name);
983                                         return 0;
984                                 }
985                                 *jdev_name = arg;
986                         }
987                 }
988 #ifdef CONFIG_QUOTA
989                 if (c == 'u' || c == 'g') {
990                         int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
991
992                         if (sb_any_quota_enabled(s)) {
993                                 reiserfs_warning(s,
994                                                  "reiserfs_parse_options: cannot change journalled quota options when quota turned on.");
995                                 return 0;
996                         }
997                         if (*arg) {     /* Some filename specified? */
998                                 if (REISERFS_SB(s)->s_qf_names[qtype]
999                                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1000                                               arg)) {
1001                                         reiserfs_warning(s,
1002                                                          "reiserfs_parse_options: %s quota file already specified.",
1003                                                          QTYPE2NAME(qtype));
1004                                         return 0;
1005                                 }
1006                                 if (strchr(arg, '/')) {
1007                                         reiserfs_warning(s,
1008                                                          "reiserfs_parse_options: quotafile must be on filesystem root.");
1009                                         return 0;
1010                                 }
1011                                 REISERFS_SB(s)->s_qf_names[qtype] =
1012                                     kmalloc(strlen(arg) + 1, GFP_KERNEL);
1013                                 if (!REISERFS_SB(s)->s_qf_names[qtype]) {
1014                                         reiserfs_warning(s,
1015                                                          "reiserfs_parse_options: not enough memory for storing quotafile name.");
1016                                         return 0;
1017                                 }
1018                                 strcpy(REISERFS_SB(s)->s_qf_names[qtype], arg);
1019                                 *mount_options |= 1 << REISERFS_QUOTA;
1020                         } else {
1021                                 kfree(REISERFS_SB(s)->s_qf_names[qtype]);
1022                                 REISERFS_SB(s)->s_qf_names[qtype] = NULL;
1023                         }
1024                 }
1025                 if (c == 'f') {
1026                         if (!strcmp(arg, "vfsold"))
1027                                 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_OLD;
1028                         else if (!strcmp(arg, "vfsv0"))
1029                                 REISERFS_SB(s)->s_jquota_fmt = QFMT_VFS_V0;
1030                         else {
1031                                 reiserfs_warning(s,
1032                                                  "reiserfs_parse_options: unknown quota format specified.");
1033                                 return 0;
1034                         }
1035                 }
1036 #else
1037                 if (c == 'u' || c == 'g' || c == 'f') {
1038                         reiserfs_warning(s,
1039                                          "reiserfs_parse_options: journalled quota options not supported.");
1040                         return 0;
1041                 }
1042 #endif
1043         }
1044
1045 #ifdef CONFIG_QUOTA
1046         if (!REISERFS_SB(s)->s_jquota_fmt
1047             && (REISERFS_SB(s)->s_qf_names[USRQUOTA]
1048                 || REISERFS_SB(s)->s_qf_names[GRPQUOTA])) {
1049                 reiserfs_warning(s,
1050                                  "reiserfs_parse_options: journalled quota format not specified.");
1051                 return 0;
1052         }
1053         /* This checking is not precise wrt the quota type but for our purposes it is sufficient */
1054         if (!(*mount_options & (1 << REISERFS_QUOTA))
1055             && sb_any_quota_enabled(s)) {
1056                 reiserfs_warning(s,
1057                                  "reiserfs_parse_options: quota options must be present when quota is turned on.");
1058                 return 0;
1059         }
1060 #endif
1061
1062         return 1;
1063 }
1064
1065 static void switch_data_mode(struct super_block *s, unsigned long mode)
1066 {
1067         REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1068                                          (1 << REISERFS_DATA_ORDERED) |
1069                                          (1 << REISERFS_DATA_WRITEBACK));
1070         REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1071 }
1072
1073 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1074 {
1075         if (mount_options & (1 << REISERFS_DATA_LOG)) {
1076                 if (!reiserfs_data_log(s)) {
1077                         switch_data_mode(s, REISERFS_DATA_LOG);
1078                         reiserfs_info(s, "switching to journaled data mode\n");
1079                 }
1080         } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1081                 if (!reiserfs_data_ordered(s)) {
1082                         switch_data_mode(s, REISERFS_DATA_ORDERED);
1083                         reiserfs_info(s, "switching to ordered data mode\n");
1084                 }
1085         } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1086                 if (!reiserfs_data_writeback(s)) {
1087                         switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1088                         reiserfs_info(s, "switching to writeback data mode\n");
1089                 }
1090         }
1091 }
1092
1093 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1094 {
1095         int flush = (1 << REISERFS_BARRIER_FLUSH);
1096         int none = (1 << REISERFS_BARRIER_NONE);
1097         int all_barrier = flush | none;
1098
1099         if (bits & all_barrier) {
1100                 REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1101                 if (bits & flush) {
1102                         REISERFS_SB(s)->s_mount_opt |= flush;
1103                         printk("reiserfs: enabling write barrier flush mode\n");
1104                 } else if (bits & none) {
1105                         REISERFS_SB(s)->s_mount_opt |= none;
1106                         printk("reiserfs: write barriers turned off\n");
1107                 }
1108         }
1109 }
1110
1111 static void handle_attrs(struct super_block *s)
1112 {
1113         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1114
1115         if (reiserfs_attrs(s)) {
1116                 if (old_format_only(s)) {
1117                         reiserfs_warning(s,
1118                                          "reiserfs: cannot support attributes on 3.5.x disk format");
1119                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1120                         return;
1121                 }
1122                 if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1123                         reiserfs_warning(s,
1124                                          "reiserfs: cannot support attributes until flag is set in super-block");
1125                         REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1126                 }
1127         }
1128 }
1129
1130 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1131 {
1132         struct reiserfs_super_block *rs;
1133         struct reiserfs_transaction_handle th;
1134         unsigned long blocks;
1135         unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1136         unsigned long safe_mask = 0;
1137         unsigned int commit_max_age = (unsigned int)-1;
1138         struct reiserfs_journal *journal = SB_JOURNAL(s);
1139         int err;
1140 #ifdef CONFIG_QUOTA
1141         int i;
1142 #endif
1143
1144         rs = SB_DISK_SUPER_BLOCK(s);
1145
1146         if (!reiserfs_parse_options
1147             (s, arg, &mount_options, &blocks, NULL, &commit_max_age)) {
1148 #ifdef CONFIG_QUOTA
1149                 for (i = 0; i < MAXQUOTAS; i++) {
1150                         kfree(REISERFS_SB(s)->s_qf_names[i]);
1151                         REISERFS_SB(s)->s_qf_names[i] = NULL;
1152                 }
1153 #endif
1154                 return -EINVAL;
1155         }
1156
1157         handle_attrs(s);
1158
1159         /* Add options that are safe here */
1160         safe_mask |= 1 << REISERFS_SMALLTAIL;
1161         safe_mask |= 1 << REISERFS_LARGETAIL;
1162         safe_mask |= 1 << REISERFS_NO_BORDER;
1163         safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1164         safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1165         safe_mask |= 1 << REISERFS_TEST4;
1166         safe_mask |= 1 << REISERFS_ATTRS;
1167         safe_mask |= 1 << REISERFS_XATTRS_USER;
1168         safe_mask |= 1 << REISERFS_POSIXACL;
1169         safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1170         safe_mask |= 1 << REISERFS_BARRIER_NONE;
1171         safe_mask |= 1 << REISERFS_ERROR_RO;
1172         safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1173         safe_mask |= 1 << REISERFS_ERROR_PANIC;
1174         safe_mask |= 1 << REISERFS_QUOTA;
1175
1176         /* Update the bitmask, taking care to keep
1177          * the bits we're not allowed to change here */
1178         REISERFS_SB(s)->s_mount_opt =
1179             (REISERFS_SB(s)->
1180              s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1181
1182         if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1183                 journal->j_max_commit_age = commit_max_age;
1184                 journal->j_max_trans_age = commit_max_age;
1185         } else if (commit_max_age == 0) {
1186                 /* 0 means restore defaults. */
1187                 journal->j_max_commit_age = journal->j_default_max_commit_age;
1188                 journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1189         }
1190
1191         if (blocks) {
1192                 int rc = reiserfs_resize(s, blocks);
1193                 if (rc != 0)
1194                         return rc;
1195         }
1196
1197         if (*mount_flags & MS_RDONLY) {
1198                 reiserfs_xattr_init(s, *mount_flags);
1199                 /* remount read-only */
1200                 if (s->s_flags & MS_RDONLY)
1201                         /* it is read-only already */
1202                         return 0;
1203                 /* try to remount file system with read-only permissions */
1204                 if (sb_umount_state(rs) == REISERFS_VALID_FS
1205                     || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1206                         return 0;
1207                 }
1208
1209                 err = journal_begin(&th, s, 10);
1210                 if (err)
1211                         return err;
1212
1213                 /* Mounting a rw partition read-only. */
1214                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1215                 set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1216                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1217         } else {
1218                 /* remount read-write */
1219                 if (!(s->s_flags & MS_RDONLY)) {
1220                         reiserfs_xattr_init(s, *mount_flags);
1221                         return 0;       /* We are read-write already */
1222                 }
1223
1224                 if (reiserfs_is_journal_aborted(journal))
1225                         return journal->j_errno;
1226
1227                 handle_data_mode(s, mount_options);
1228                 handle_barrier_mode(s, mount_options);
1229                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1230                 s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1231                 err = journal_begin(&th, s, 10);
1232                 if (err)
1233                         return err;
1234
1235                 /* Mount a partition which is read-only, read-write */
1236                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1237                 REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1238                 s->s_flags &= ~MS_RDONLY;
1239                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1240                 /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1241                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1242                 REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1243         }
1244         /* this will force a full flush of all journal lists */
1245         SB_JOURNAL(s)->j_must_wait = 1;
1246         err = journal_end(&th, s, 10);
1247         if (err)
1248                 return err;
1249         s->s_dirt = 0;
1250
1251         if (!(*mount_flags & MS_RDONLY)) {
1252                 finish_unfinished(s);
1253                 reiserfs_xattr_init(s, *mount_flags);
1254         }
1255
1256         return 0;
1257 }
1258
1259 /* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk.
1260  * @sb - superblock for this filesystem
1261  * @bi - the bitmap info to be loaded. Requires that bi->bh is valid.
1262  *
1263  * This routine counts how many free bits there are, finding the first zero
1264  * as a side effect. Could also be implemented as a loop of test_bit() calls, or
1265  * a loop of find_first_zero_bit() calls. This implementation is similar to
1266  * find_first_zero_bit(), but doesn't return after it finds the first bit.
1267  * Should only be called on fs mount, but should be fairly efficient anyways.
1268  *
1269  * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself
1270  * will * invariably occupt block 0 represented in the bitmap. The only
1271  * exception to this is when free_count also == 0, since there will be no
1272  * free blocks at all.
1273  */
1274
1275 static void load_bitmap_info_data(struct super_block *sb,
1276                                   struct reiserfs_bitmap_info *bi)
1277 {
1278         unsigned long *cur = (unsigned long *)bi->bh->b_data;
1279
1280         while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) {
1281
1282                 /* No need to scan if all 0's or all 1's.
1283                  * Since we're only counting 0's, we can simply ignore all 1's */
1284                 if (*cur == 0) {
1285                         if (bi->first_zero_hint == 0) {
1286                                 bi->first_zero_hint =
1287                                     ((char *)cur - bi->bh->b_data) << 3;
1288                         }
1289                         bi->free_count += sizeof(unsigned long) * 8;
1290                 } else if (*cur != ~0L) {
1291                         int b;
1292                         for (b = 0; b < sizeof(unsigned long) * 8; b++) {
1293                                 if (!reiserfs_test_le_bit(b, cur)) {
1294                                         bi->free_count++;
1295                                         if (bi->first_zero_hint == 0)
1296                                                 bi->first_zero_hint =
1297                                                     (((char *)cur -
1298                                                       bi->bh->b_data) << 3) + b;
1299                                 }
1300                         }
1301                 }
1302                 cur++;
1303         }
1304
1305 #ifdef CONFIG_REISERFS_CHECK
1306 // This outputs a lot of unneded info on big FSes
1307 //    reiserfs_warning ("bitmap loaded from block %d: %d free blocks",
1308 //                    bi->bh->b_blocknr, bi->free_count);
1309 #endif
1310 }
1311
1312 static int read_bitmaps(struct super_block *s)
1313 {
1314         int i, bmap_nr;
1315
1316         SB_AP_BITMAP(s) =
1317             vmalloc(sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1318         if (SB_AP_BITMAP(s) == 0)
1319                 return 1;
1320         memset(SB_AP_BITMAP(s), 0,
1321                sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
1322         for (i = 0, bmap_nr =
1323              REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
1324              i < SB_BMAP_NR(s); i++, bmap_nr = s->s_blocksize * 8 * i) {
1325                 SB_AP_BITMAP(s)[i].bh = sb_getblk(s, bmap_nr);
1326                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
1327                         ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
1328         }
1329         for (i = 0; i < SB_BMAP_NR(s); i++) {
1330                 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1331                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1332                         reiserfs_warning(s, "sh-2029: reiserfs read_bitmaps: "
1333                                          "bitmap block (#%lu) reading failed",
1334                                          SB_AP_BITMAP(s)[i].bh->b_blocknr);
1335                         for (i = 0; i < SB_BMAP_NR(s); i++)
1336                                 brelse(SB_AP_BITMAP(s)[i].bh);
1337                         vfree(SB_AP_BITMAP(s));
1338                         SB_AP_BITMAP(s) = NULL;
1339                         return 1;
1340                 }
1341                 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1342         }
1343         return 0;
1344 }
1345
1346 static int read_old_bitmaps(struct super_block *s)
1347 {
1348         int i;
1349         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1350         int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1;    /* first of bitmap blocks */
1351
1352         /* read true bitmap */
1353         SB_AP_BITMAP(s) =
1354             vmalloc(sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1355         if (SB_AP_BITMAP(s) == 0)
1356                 return 1;
1357
1358         memset(SB_AP_BITMAP(s), 0,
1359                sizeof(struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
1360
1361         for (i = 0; i < sb_bmap_nr(rs); i++) {
1362                 SB_AP_BITMAP(s)[i].bh = sb_bread(s, bmp1 + i);
1363                 if (!SB_AP_BITMAP(s)[i].bh)
1364                         return 1;
1365                 load_bitmap_info_data(s, SB_AP_BITMAP(s) + i);
1366         }
1367
1368         return 0;
1369 }
1370
1371 static int read_super_block(struct super_block *s, int offset)
1372 {
1373         struct buffer_head *bh;
1374         struct reiserfs_super_block *rs;
1375         int fs_blocksize;
1376
1377         bh = sb_bread(s, offset / s->s_blocksize);
1378         if (!bh) {
1379                 reiserfs_warning(s, "sh-2006: read_super_block: "
1380                                  "bread failed (dev %s, block %lu, size %lu)",
1381                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1382                                  s->s_blocksize);
1383                 return 1;
1384         }
1385
1386         rs = (struct reiserfs_super_block *)bh->b_data;
1387         if (!is_any_reiserfs_magic_string(rs)) {
1388                 brelse(bh);
1389                 return 1;
1390         }
1391         //
1392         // ok, reiserfs signature (old or new) found in at the given offset
1393         //    
1394         fs_blocksize = sb_blocksize(rs);
1395         brelse(bh);
1396         sb_set_blocksize(s, fs_blocksize);
1397
1398         bh = sb_bread(s, offset / s->s_blocksize);
1399         if (!bh) {
1400                 reiserfs_warning(s, "sh-2007: read_super_block: "
1401                                  "bread failed (dev %s, block %lu, size %lu)\n",
1402                                  reiserfs_bdevname(s), offset / s->s_blocksize,
1403                                  s->s_blocksize);
1404                 return 1;
1405         }
1406
1407         rs = (struct reiserfs_super_block *)bh->b_data;
1408         if (sb_blocksize(rs) != s->s_blocksize) {
1409                 reiserfs_warning(s, "sh-2011: read_super_block: "
1410                                  "can't find a reiserfs filesystem on (dev %s, block %Lu, size %lu)\n",
1411                                  reiserfs_bdevname(s),
1412                                  (unsigned long long)bh->b_blocknr,
1413                                  s->s_blocksize);
1414                 brelse(bh);
1415                 return 1;
1416         }
1417
1418         if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1419                 brelse(bh);
1420                 reiserfs_warning(s,
1421                                  "Unfinished reiserfsck --rebuild-tree run detected. Please run\n"
1422                                  "reiserfsck --rebuild-tree and wait for a completion. If that fails\n"
1423                                  "get newer reiserfsprogs package");
1424                 return 1;
1425         }
1426
1427         SB_BUFFER_WITH_SB(s) = bh;
1428         SB_DISK_SUPER_BLOCK(s) = rs;
1429
1430         if (is_reiserfs_jr(rs)) {
1431                 /* magic is of non-standard journal filesystem, look at s_version to
1432                    find which format is in use */
1433                 if (sb_version(rs) == REISERFS_VERSION_2)
1434                         reiserfs_warning(s,
1435                                          "read_super_block: found reiserfs format \"3.6\""
1436                                          " with non-standard journal");
1437                 else if (sb_version(rs) == REISERFS_VERSION_1)
1438                         reiserfs_warning(s,
1439                                          "read_super_block: found reiserfs format \"3.5\""
1440                                          " with non-standard journal");
1441                 else {
1442                         reiserfs_warning(s,
1443                                          "sh-2012: read_super_block: found unknown "
1444                                          "format \"%u\" of reiserfs with non-standard magic",
1445                                          sb_version(rs));
1446                         return 1;
1447                 }
1448         } else
1449                 /* s_version of standard format may contain incorrect information,
1450                    so we just look at the magic string */
1451                 reiserfs_info(s,
1452                               "found reiserfs format \"%s\" with standard journal\n",
1453                               is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1454
1455         s->s_op = &reiserfs_sops;
1456         s->s_export_op = &reiserfs_export_ops;
1457 #ifdef CONFIG_QUOTA
1458         s->s_qcop = &reiserfs_qctl_operations;
1459         s->dq_op = &reiserfs_quota_operations;
1460 #endif
1461
1462         /* new format is limited by the 32 bit wide i_blocks field, want to
1463          ** be one full block below that.
1464          */
1465         s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1466         return 0;
1467 }
1468
1469 /* after journal replay, reread all bitmap and super blocks */
1470 static int reread_meta_blocks(struct super_block *s)
1471 {
1472         int i;
1473         ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1474         wait_on_buffer(SB_BUFFER_WITH_SB(s));
1475         if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1476                 reiserfs_warning(s,
1477                                  "reread_meta_blocks, error reading the super");
1478                 return 1;
1479         }
1480
1481         for (i = 0; i < SB_BMAP_NR(s); i++) {
1482                 ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh));
1483                 wait_on_buffer(SB_AP_BITMAP(s)[i].bh);
1484                 if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
1485                         reiserfs_warning(s,
1486                                          "reread_meta_blocks, error reading bitmap block number %d at %llu",
1487                                          i,
1488                                          (unsigned long long)SB_AP_BITMAP(s)[i].
1489                                          bh->b_blocknr);
1490                         return 1;
1491                 }
1492         }
1493         return 0;
1494
1495 }
1496
1497 /////////////////////////////////////////////////////
1498 // hash detection stuff
1499
1500 // if root directory is empty - we set default - Yura's - hash and
1501 // warn about it
1502 // FIXME: we look for only one name in a directory. If tea and yura
1503 // bith have the same value - we ask user to send report to the
1504 // mailing list
1505 static __u32 find_hash_out(struct super_block *s)
1506 {
1507         int retval;
1508         struct inode *inode;
1509         struct cpu_key key;
1510         INITIALIZE_PATH(path);
1511         struct reiserfs_dir_entry de;
1512         __u32 hash = DEFAULT_HASH;
1513
1514         inode = s->s_root->d_inode;
1515
1516         do {                    // Some serious "goto"-hater was there ;)
1517                 u32 teahash, r5hash, yurahash;
1518
1519                 make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1520                 retval = search_by_entry_key(s, &key, &path, &de);
1521                 if (retval == IO_ERROR) {
1522                         pathrelse(&path);
1523                         return UNSET_HASH;
1524                 }
1525                 if (retval == NAME_NOT_FOUND)
1526                         de.de_entry_num--;
1527                 set_de_name_and_namelen(&de);
1528                 if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1529                         /* allow override in this case */
1530                         if (reiserfs_rupasov_hash(s)) {
1531                                 hash = YURA_HASH;
1532                         }
1533                         reiserfs_warning(s, "FS seems to be empty, autodetect "
1534                                          "is using the default hash");
1535                         break;
1536                 }
1537                 r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1538                 teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1539                 yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1540                 if (((teahash == r5hash)
1541                      &&
1542                      (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1543                       == r5hash)) || ((teahash == yurahash)
1544                                       && (yurahash ==
1545                                           GET_HASH_VALUE(deh_offset
1546                                                          (&
1547                                                           (de.
1548                                                            de_deh[de.
1549                                                                   de_entry_num])))))
1550                     || ((r5hash == yurahash)
1551                         && (yurahash ==
1552                             GET_HASH_VALUE(deh_offset
1553                                            (&(de.de_deh[de.de_entry_num])))))) {
1554                         reiserfs_warning(s,
1555                                          "Unable to automatically detect hash function. "
1556                                          "Please mount with -o hash={tea,rupasov,r5}",
1557                                          reiserfs_bdevname(s));
1558                         hash = UNSET_HASH;
1559                         break;
1560                 }
1561                 if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1562                     yurahash)
1563                         hash = YURA_HASH;
1564                 else if (GET_HASH_VALUE
1565                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1566                         hash = TEA_HASH;
1567                 else if (GET_HASH_VALUE
1568                          (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1569                         hash = R5_HASH;
1570                 else {
1571                         reiserfs_warning(s, "Unrecognised hash function");
1572                         hash = UNSET_HASH;
1573                 }
1574         } while (0);
1575
1576         pathrelse(&path);
1577         return hash;
1578 }
1579
1580 // finds out which hash names are sorted with
1581 static int what_hash(struct super_block *s)
1582 {
1583         __u32 code;
1584
1585         code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1586
1587         /* reiserfs_hash_detect() == true if any of the hash mount options
1588          ** were used.  We must check them to make sure the user isn't
1589          ** using a bad hash value
1590          */
1591         if (code == UNSET_HASH || reiserfs_hash_detect(s))
1592                 code = find_hash_out(s);
1593
1594         if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1595                 /* detection has found the hash, and we must check against the 
1596                  ** mount options 
1597                  */
1598                 if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1599                         reiserfs_warning(s, "Error, %s hash detected, "
1600                                          "unable to force rupasov hash",
1601                                          reiserfs_hashname(code));
1602                         code = UNSET_HASH;
1603                 } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1604                         reiserfs_warning(s, "Error, %s hash detected, "
1605                                          "unable to force tea hash",
1606                                          reiserfs_hashname(code));
1607                         code = UNSET_HASH;
1608                 } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1609                         reiserfs_warning(s, "Error, %s hash detected, "
1610                                          "unable to force r5 hash",
1611                                          reiserfs_hashname(code));
1612                         code = UNSET_HASH;
1613                 }
1614         } else {
1615                 /* find_hash_out was not called or could not determine the hash */
1616                 if (reiserfs_rupasov_hash(s)) {
1617                         code = YURA_HASH;
1618                 } else if (reiserfs_tea_hash(s)) {
1619                         code = TEA_HASH;
1620                 } else if (reiserfs_r5_hash(s)) {
1621                         code = R5_HASH;
1622                 }
1623         }
1624
1625         /* if we are mounted RW, and we have a new valid hash code, update 
1626          ** the super
1627          */
1628         if (code != UNSET_HASH &&
1629             !(s->s_flags & MS_RDONLY) &&
1630             code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1631                 set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1632         }
1633         return code;
1634 }
1635
1636 // return pointer to appropriate function
1637 static hashf_t hash_function(struct super_block *s)
1638 {
1639         switch (what_hash(s)) {
1640         case TEA_HASH:
1641                 reiserfs_info(s, "Using tea hash to sort names\n");
1642                 return keyed_hash;
1643         case YURA_HASH:
1644                 reiserfs_info(s, "Using rupasov hash to sort names\n");
1645                 return yura_hash;
1646         case R5_HASH:
1647                 reiserfs_info(s, "Using r5 hash to sort names\n");
1648                 return r5_hash;
1649         }
1650         return NULL;
1651 }
1652
1653 // this is used to set up correct value for old partitions
1654 static int function2code(hashf_t func)
1655 {
1656         if (func == keyed_hash)
1657                 return TEA_HASH;
1658         if (func == yura_hash)
1659                 return YURA_HASH;
1660         if (func == r5_hash)
1661                 return R5_HASH;
1662
1663         BUG();                  // should never happen
1664
1665         return 0;
1666 }
1667
1668 #define SWARN(silent, s, ...)                   \
1669         if (!(silent))                          \
1670                 reiserfs_warning (s, __VA_ARGS__)
1671
1672 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1673 {
1674         struct inode *root_inode;
1675         int j;
1676         struct reiserfs_transaction_handle th;
1677         int old_format = 0;
1678         unsigned long blocks;
1679         unsigned int commit_max_age = 0;
1680         int jinit_done = 0;
1681         struct reiserfs_iget_args args;
1682         struct reiserfs_super_block *rs;
1683         char *jdev_name;
1684         struct reiserfs_sb_info *sbi;
1685         int errval = -EINVAL;
1686
1687         sbi = kmalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1688         if (!sbi) {
1689                 errval = -ENOMEM;
1690                 goto error;
1691         }
1692         s->s_fs_info = sbi;
1693         memset(sbi, 0, sizeof(struct reiserfs_sb_info));
1694         /* Set default values for options: non-aggressive tails, RO on errors */
1695         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1696         REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1697         /* no preallocation minimum, be smart in
1698            reiserfs_file_write instead */
1699         REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
1700         /* Preallocate by 16 blocks (17-1) at once */
1701         REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
1702         /* Initialize the rwsem for xattr dir */
1703         init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
1704
1705         /* setup default block allocator options */
1706         reiserfs_init_alloc_options(s);
1707
1708         jdev_name = NULL;
1709         if (reiserfs_parse_options
1710             (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1711              &commit_max_age) == 0) {
1712                 goto error;
1713         }
1714
1715         if (blocks) {
1716                 SWARN(silent, s, "jmacd-7: reiserfs_fill_super: resize option "
1717                       "for remount only");
1718                 goto error;
1719         }
1720
1721         /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1722         if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1723                 old_format = 1;
1724         /* try new format (64-th 1k block), which can contain reiserfs super block */
1725         else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1726                 SWARN(silent, s,
1727                       "sh-2021: reiserfs_fill_super: can not find reiserfs on %s",
1728                       reiserfs_bdevname(s));
1729                 goto error;
1730         }
1731
1732         rs = SB_DISK_SUPER_BLOCK(s);
1733         /* Let's do basic sanity check to verify that underlying device is not
1734            smaller than the filesystem. If the check fails then abort and scream,
1735            because bad stuff will happen otherwise. */
1736         if (s->s_bdev && s->s_bdev->bd_inode
1737             && i_size_read(s->s_bdev->bd_inode) <
1738             sb_block_count(rs) * sb_blocksize(rs)) {
1739                 SWARN(silent, s,
1740                       "Filesystem on %s cannot be mounted because it is bigger than the device",
1741                       reiserfs_bdevname(s));
1742                 SWARN(silent, s,
1743                       "You may need to run fsck or increase size of your LVM partition");
1744                 SWARN(silent, s,
1745                       "Or may be you forgot to reboot after fdisk when it told you to");
1746                 goto error;
1747         }
1748
1749         sbi->s_mount_state = SB_REISERFS_STATE(s);
1750         sbi->s_mount_state = REISERFS_VALID_FS;
1751
1752         if (old_format ? read_old_bitmaps(s) : read_bitmaps(s)) {
1753                 SWARN(silent, s,
1754                       "jmacd-8: reiserfs_fill_super: unable to read bitmap");
1755                 goto error;
1756         }
1757 #ifdef CONFIG_REISERFS_CHECK
1758         SWARN(silent, s, "CONFIG_REISERFS_CHECK is set ON");
1759         SWARN(silent, s, "- it is slow mode for debugging.");
1760 #endif
1761
1762         /* make data=ordered the default */
1763         if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1764             !reiserfs_data_writeback(s)) {
1765                 REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1766         }
1767
1768         if (reiserfs_data_log(s)) {
1769                 reiserfs_info(s, "using journaled data mode\n");
1770         } else if (reiserfs_data_ordered(s)) {
1771                 reiserfs_info(s, "using ordered data mode\n");
1772         } else {
1773                 reiserfs_info(s, "using writeback data mode\n");
1774         }
1775         if (reiserfs_barrier_flush(s)) {
1776                 printk("reiserfs: using flush barriers\n");
1777         }
1778         // set_device_ro(s->s_dev, 1) ;
1779         if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1780                 SWARN(silent, s,
1781                       "sh-2022: reiserfs_fill_super: unable to initialize journal space");
1782                 goto error;
1783         } else {
1784                 jinit_done = 1; /* once this is set, journal_release must be called
1785                                  ** if we error out of the mount
1786                                  */
1787         }
1788         if (reread_meta_blocks(s)) {
1789                 SWARN(silent, s,
1790                       "jmacd-9: reiserfs_fill_super: unable to reread meta blocks after journal init");
1791                 goto error;
1792         }
1793
1794         if (replay_only(s))
1795                 goto error;
1796
1797         if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1798                 SWARN(silent, s,
1799                       "clm-7000: Detected readonly device, marking FS readonly");
1800                 s->s_flags |= MS_RDONLY;
1801         }
1802         args.objectid = REISERFS_ROOT_OBJECTID;
1803         args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1804         root_inode =
1805             iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1806                          reiserfs_init_locked_inode, (void *)(&args));
1807         if (!root_inode) {
1808                 SWARN(silent, s,
1809                       "jmacd-10: reiserfs_fill_super: get root inode failed");
1810                 goto error;
1811         }
1812
1813         if (root_inode->i_state & I_NEW) {
1814                 reiserfs_read_locked_inode(root_inode, &args);
1815                 unlock_new_inode(root_inode);
1816         }
1817
1818         s->s_root = d_alloc_root(root_inode);
1819         if (!s->s_root) {
1820                 iput(root_inode);
1821                 goto error;
1822         }
1823         // define and initialize hash function
1824         sbi->s_hash_function = hash_function(s);
1825         if (sbi->s_hash_function == NULL) {
1826                 dput(s->s_root);
1827                 s->s_root = NULL;
1828                 goto error;
1829         }
1830
1831         if (is_reiserfs_3_5(rs)
1832             || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1833                 set_bit(REISERFS_3_5, &(sbi->s_properties));
1834         else
1835                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1836
1837         if (!(s->s_flags & MS_RDONLY)) {
1838
1839                 errval = journal_begin(&th, s, 1);
1840                 if (errval) {
1841                         dput(s->s_root);
1842                         s->s_root = NULL;
1843                         goto error;
1844                 }
1845                 reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1846
1847                 set_sb_umount_state(rs, REISERFS_ERROR_FS);
1848                 set_sb_fs_state(rs, 0);
1849
1850                 if (old_format_only(s)) {
1851                         /* filesystem of format 3.5 either with standard or non-standard
1852                            journal */
1853                         if (convert_reiserfs(s)) {
1854                                 /* and -o conv is given */
1855                                 if (!silent)
1856                                         reiserfs_info(s,
1857                                                       "converting 3.5 filesystem to the 3.6 format");
1858
1859                                 if (is_reiserfs_3_5(rs))
1860                                         /* put magic string of 3.6 format. 2.2 will not be able to
1861                                            mount this filesystem anymore */
1862                                         memcpy(rs->s_v1.s_magic,
1863                                                reiserfs_3_6_magic_string,
1864                                                sizeof
1865                                                (reiserfs_3_6_magic_string));
1866
1867                                 set_sb_version(rs, REISERFS_VERSION_2);
1868                                 reiserfs_convert_objectid_map_v1(s);
1869                                 set_bit(REISERFS_3_6, &(sbi->s_properties));
1870                                 clear_bit(REISERFS_3_5, &(sbi->s_properties));
1871                         } else if (!silent) {
1872                                 reiserfs_info(s, "using 3.5.x disk format\n");
1873                         }
1874                 }
1875
1876                 journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1877                 errval = journal_end(&th, s, 1);
1878                 if (errval) {
1879                         dput(s->s_root);
1880                         s->s_root = NULL;
1881                         goto error;
1882                 }
1883
1884                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1885                         dput(s->s_root);
1886                         s->s_root = NULL;
1887                         goto error;
1888                 }
1889
1890                 /* look for files which were to be removed in previous session */
1891                 finish_unfinished(s);
1892         } else {
1893                 if (old_format_only(s) && !silent) {
1894                         reiserfs_info(s, "using 3.5.x disk format\n");
1895                 }
1896
1897                 if ((errval = reiserfs_xattr_init(s, s->s_flags))) {
1898                         dput(s->s_root);
1899                         s->s_root = NULL;
1900                         goto error;
1901                 }
1902         }
1903         // mark hash in super block: it could be unset. overwrite should be ok
1904         set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
1905
1906         handle_attrs(s);
1907
1908         reiserfs_proc_info_init(s);
1909
1910         init_waitqueue_head(&(sbi->s_wait));
1911         spin_lock_init(&sbi->bitmap_lock);
1912
1913         return (0);
1914
1915       error:
1916         if (jinit_done) {       /* kill the commit thread, free journal ram */
1917                 journal_release_error(NULL, s);
1918         }
1919         if (SB_DISK_SUPER_BLOCK(s)) {
1920                 for (j = 0; j < SB_BMAP_NR(s); j++) {
1921                         if (SB_AP_BITMAP(s))
1922                                 brelse(SB_AP_BITMAP(s)[j].bh);
1923                 }
1924                 vfree(SB_AP_BITMAP(s));
1925         }
1926         if (SB_BUFFER_WITH_SB(s))
1927                 brelse(SB_BUFFER_WITH_SB(s));
1928 #ifdef CONFIG_QUOTA
1929         for (j = 0; j < MAXQUOTAS; j++) {
1930                 kfree(sbi->s_qf_names[j]);
1931                 sbi->s_qf_names[j] = NULL;
1932         }
1933 #endif
1934         kfree(sbi);
1935
1936         s->s_fs_info = NULL;
1937         return errval;
1938 }
1939
1940 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1941 {
1942         struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
1943
1944         buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
1945         buf->f_bfree = sb_free_blocks(rs);
1946         buf->f_bavail = buf->f_bfree;
1947         buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
1948         buf->f_bsize = dentry->d_sb->s_blocksize;
1949         /* changed to accommodate gcc folks. */
1950         buf->f_type = REISERFS_SUPER_MAGIC;
1951         return 0;
1952 }
1953
1954 #ifdef CONFIG_QUOTA
1955 static int reiserfs_dquot_initialize(struct inode *inode, int type)
1956 {
1957         struct reiserfs_transaction_handle th;
1958         int ret, err;
1959
1960         /* We may create quota structure so we need to reserve enough blocks */
1961         reiserfs_write_lock(inode->i_sb);
1962         ret =
1963             journal_begin(&th, inode->i_sb,
1964                           2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1965         if (ret)
1966                 goto out;
1967         ret = dquot_initialize(inode, type);
1968         err =
1969             journal_end(&th, inode->i_sb,
1970                         2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb));
1971         if (!ret && err)
1972                 ret = err;
1973       out:
1974         reiserfs_write_unlock(inode->i_sb);
1975         return ret;
1976 }
1977
1978 static int reiserfs_dquot_drop(struct inode *inode)
1979 {
1980         struct reiserfs_transaction_handle th;
1981         int ret, err;
1982
1983         /* We may delete quota structure so we need to reserve enough blocks */
1984         reiserfs_write_lock(inode->i_sb);
1985         ret =
1986             journal_begin(&th, inode->i_sb,
1987                           2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1988         if (ret)
1989                 goto out;
1990         ret = dquot_drop(inode);
1991         err =
1992             journal_end(&th, inode->i_sb,
1993                         2 * REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb));
1994         if (!ret && err)
1995                 ret = err;
1996       out:
1997         reiserfs_write_unlock(inode->i_sb);
1998         return ret;
1999 }
2000
2001 static int reiserfs_write_dquot(struct dquot *dquot)
2002 {
2003         struct reiserfs_transaction_handle th;
2004         int ret, err;
2005
2006         reiserfs_write_lock(dquot->dq_sb);
2007         ret =
2008             journal_begin(&th, dquot->dq_sb,
2009                           REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2010         if (ret)
2011                 goto out;
2012         ret = dquot_commit(dquot);
2013         err =
2014             journal_end(&th, dquot->dq_sb,
2015                         REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2016         if (!ret && err)
2017                 ret = err;
2018       out:
2019         reiserfs_write_unlock(dquot->dq_sb);
2020         return ret;
2021 }
2022
2023 static int reiserfs_acquire_dquot(struct dquot *dquot)
2024 {
2025         struct reiserfs_transaction_handle th;
2026         int ret, err;
2027
2028         reiserfs_write_lock(dquot->dq_sb);
2029         ret =
2030             journal_begin(&th, dquot->dq_sb,
2031                           REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2032         if (ret)
2033                 goto out;
2034         ret = dquot_acquire(dquot);
2035         err =
2036             journal_end(&th, dquot->dq_sb,
2037                         REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2038         if (!ret && err)
2039                 ret = err;
2040       out:
2041         reiserfs_write_unlock(dquot->dq_sb);
2042         return ret;
2043 }
2044
2045 static int reiserfs_release_dquot(struct dquot *dquot)
2046 {
2047         struct reiserfs_transaction_handle th;
2048         int ret, err;
2049
2050         reiserfs_write_lock(dquot->dq_sb);
2051         ret =
2052             journal_begin(&th, dquot->dq_sb,
2053                           REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2054         if (ret)
2055                 goto out;
2056         ret = dquot_release(dquot);
2057         err =
2058             journal_end(&th, dquot->dq_sb,
2059                         REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2060         if (!ret && err)
2061                 ret = err;
2062       out:
2063         reiserfs_write_unlock(dquot->dq_sb);
2064         return ret;
2065 }
2066
2067 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2068 {
2069         /* Are we journalling quotas? */
2070         if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2071             REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2072                 dquot_mark_dquot_dirty(dquot);
2073                 return reiserfs_write_dquot(dquot);
2074         } else
2075                 return dquot_mark_dquot_dirty(dquot);
2076 }
2077
2078 static int reiserfs_write_info(struct super_block *sb, int type)
2079 {
2080         struct reiserfs_transaction_handle th;
2081         int ret, err;
2082
2083         /* Data block + inode block */
2084         reiserfs_write_lock(sb);
2085         ret = journal_begin(&th, sb, 2);
2086         if (ret)
2087                 goto out;
2088         ret = dquot_commit_info(sb, type);
2089         err = journal_end(&th, sb, 2);
2090         if (!ret && err)
2091                 ret = err;
2092       out:
2093         reiserfs_write_unlock(sb);
2094         return ret;
2095 }
2096
2097 /*
2098  * Turn on quotas during mount time - we need to find the quota file and such...
2099  */
2100 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2101 {
2102         return vfs_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2103                                   REISERFS_SB(sb)->s_jquota_fmt, type);
2104 }
2105
2106 /*
2107  * Standard function to be called on quota_on
2108  */
2109 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2110                              char *path)
2111 {
2112         int err;
2113         struct nameidata nd;
2114
2115         if (!(REISERFS_SB(sb)->s_mount_opt & (1 << REISERFS_QUOTA)))
2116                 return -EINVAL;
2117         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2118         if (err)
2119                 return err;
2120         /* Quotafile not on the same filesystem? */
2121         if (nd.mnt->mnt_sb != sb) {
2122                 path_release(&nd);
2123                 return -EXDEV;
2124         }
2125         /* We must not pack tails for quota files on reiserfs for quota IO to work */
2126         if (!REISERFS_I(nd.dentry->d_inode)->i_flags & i_nopack_mask) {
2127                 reiserfs_warning(sb,
2128                                  "reiserfs: Quota file must have tail packing disabled.");
2129                 path_release(&nd);
2130                 return -EINVAL;
2131         }
2132         /* Not journalling quota? No more tests needed... */
2133         if (!REISERFS_SB(sb)->s_qf_names[USRQUOTA] &&
2134             !REISERFS_SB(sb)->s_qf_names[GRPQUOTA]) {
2135                 path_release(&nd);
2136                 return vfs_quota_on(sb, type, format_id, path);
2137         }
2138         /* Quotafile not of fs root? */
2139         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2140                 reiserfs_warning(sb,
2141                                  "reiserfs: Quota file not on filesystem root. "
2142                                  "Journalled quota will not work.");
2143         path_release(&nd);
2144         return vfs_quota_on(sb, type, format_id, path);
2145 }
2146
2147 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2148  * acquiring the locks... As quota files are never truncated and quota code
2149  * itself serializes the operations (and noone else should touch the files)
2150  * we don't have to be afraid of races */
2151 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2152                                    size_t len, loff_t off)
2153 {
2154         struct inode *inode = sb_dqopt(sb)->files[type];
2155         unsigned long blk = off >> sb->s_blocksize_bits;
2156         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2157         size_t toread;
2158         struct buffer_head tmp_bh, *bh;
2159         loff_t i_size = i_size_read(inode);
2160
2161         if (off > i_size)
2162                 return 0;
2163         if (off + len > i_size)
2164                 len = i_size - off;
2165         toread = len;
2166         while (toread > 0) {
2167                 tocopy =
2168                     sb->s_blocksize - offset <
2169                     toread ? sb->s_blocksize - offset : toread;
2170                 tmp_bh.b_state = 0;
2171                 /* Quota files are without tails so we can safely use this function */
2172                 reiserfs_write_lock(sb);
2173                 err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2174                 reiserfs_write_unlock(sb);
2175                 if (err)
2176                         return err;
2177                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
2178                         memset(data, 0, tocopy);
2179                 else {
2180                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2181                         if (!bh)
2182                                 return -EIO;
2183                         memcpy(data, bh->b_data + offset, tocopy);
2184                         brelse(bh);
2185                 }
2186                 offset = 0;
2187                 toread -= tocopy;
2188                 data += tocopy;
2189                 blk++;
2190         }
2191         return len;
2192 }
2193
2194 /* Write to quotafile (we know the transaction is already started and has
2195  * enough credits) */
2196 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2197                                     const char *data, size_t len, loff_t off)
2198 {
2199         struct inode *inode = sb_dqopt(sb)->files[type];
2200         unsigned long blk = off >> sb->s_blocksize_bits;
2201         int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2202         int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2203         size_t towrite = len;
2204         struct buffer_head tmp_bh, *bh;
2205
2206         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2207         while (towrite > 0) {
2208                 tocopy = sb->s_blocksize - offset < towrite ?
2209                     sb->s_blocksize - offset : towrite;
2210                 tmp_bh.b_state = 0;
2211                 err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2212                 if (err)
2213                         goto out;
2214                 if (offset || tocopy != sb->s_blocksize)
2215                         bh = sb_bread(sb, tmp_bh.b_blocknr);
2216                 else
2217                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
2218                 if (!bh) {
2219                         err = -EIO;
2220                         goto out;
2221                 }
2222                 lock_buffer(bh);
2223                 memcpy(bh->b_data + offset, data, tocopy);
2224                 flush_dcache_page(bh->b_page);
2225                 set_buffer_uptodate(bh);
2226                 unlock_buffer(bh);
2227                 reiserfs_prepare_for_journal(sb, bh, 1);
2228                 journal_mark_dirty(current->journal_info, sb, bh);
2229                 if (!journal_quota)
2230                         reiserfs_add_ordered_list(inode, bh);
2231                 brelse(bh);
2232                 offset = 0;
2233                 towrite -= tocopy;
2234                 data += tocopy;
2235                 blk++;
2236         }
2237       out:
2238         if (len == towrite)
2239                 return err;
2240         if (inode->i_size < off + len - towrite)
2241                 i_size_write(inode, off + len - towrite);
2242         inode->i_version++;
2243         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2244         mark_inode_dirty(inode);
2245         mutex_unlock(&inode->i_mutex);
2246         return len - towrite;
2247 }
2248
2249 #endif
2250
2251 static int get_super_block(struct file_system_type *fs_type,
2252                            int flags, const char *dev_name,
2253                            void *data, struct vfsmount *mnt)
2254 {
2255         return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
2256                            mnt);
2257 }
2258
2259 static int __init init_reiserfs_fs(void)
2260 {
2261         int ret;
2262
2263         if ((ret = init_inodecache())) {
2264                 return ret;
2265         }
2266
2267         if ((ret = reiserfs_xattr_register_handlers()))
2268                 goto failed_reiserfs_xattr_register_handlers;
2269
2270         reiserfs_proc_info_global_init();
2271         reiserfs_proc_register_global("version",
2272                                       reiserfs_global_version_in_proc);
2273
2274         ret = register_filesystem(&reiserfs_fs_type);
2275
2276         if (ret == 0) {
2277                 return 0;
2278         }
2279
2280         reiserfs_xattr_unregister_handlers();
2281
2282       failed_reiserfs_xattr_register_handlers:
2283         reiserfs_proc_unregister_global("version");
2284         reiserfs_proc_info_global_done();
2285         destroy_inodecache();
2286
2287         return ret;
2288 }
2289
2290 static void __exit exit_reiserfs_fs(void)
2291 {
2292         reiserfs_xattr_unregister_handlers();
2293         reiserfs_proc_unregister_global("version");
2294         reiserfs_proc_info_global_done();
2295         unregister_filesystem(&reiserfs_fs_type);
2296         destroy_inodecache();
2297 }
2298
2299 struct file_system_type reiserfs_fs_type = {
2300         .owner = THIS_MODULE,
2301         .name = "reiserfs",
2302         .get_sb = get_super_block,
2303         .kill_sb = kill_block_super,
2304         .fs_flags = FS_REQUIRES_DEV,
2305 };
2306
2307 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2308 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2309 MODULE_LICENSE("GPL");
2310
2311 module_init(init_reiserfs_fs);
2312 module_exit(exit_reiserfs_fs);