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