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