d1ad11a8a4a59c2d7de3e854cfeb8b28716be59d
[muen/linux.git] / fs / affs / super.c
1 /*
2  *  linux/fs/affs/inode.c
3  *
4  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
5  *
6  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
7  *
8  *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
9  *
10  *  (C) 1991  Linus Torvalds - minix filesystem
11  */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/parser.h>
17 #include <linux/magic.h>
18 #include <linux/sched.h>
19 #include <linux/cred.h>
20 #include <linux/slab.h>
21 #include <linux/writeback.h>
22 #include <linux/blkdev.h>
23 #include <linux/seq_file.h>
24 #include <linux/iversion.h>
25 #include "affs.h"
26
27 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
28 static int affs_show_options(struct seq_file *m, struct dentry *root);
29 static int affs_remount (struct super_block *sb, int *flags, char *data);
30
31 static void
32 affs_commit_super(struct super_block *sb, int wait)
33 {
34         struct affs_sb_info *sbi = AFFS_SB(sb);
35         struct buffer_head *bh = sbi->s_root_bh;
36         struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
37
38         lock_buffer(bh);
39         affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
40         affs_fix_checksum(sb, bh);
41         unlock_buffer(bh);
42
43         mark_buffer_dirty(bh);
44         if (wait)
45                 sync_dirty_buffer(bh);
46 }
47
48 static void
49 affs_put_super(struct super_block *sb)
50 {
51         struct affs_sb_info *sbi = AFFS_SB(sb);
52         pr_debug("%s()\n", __func__);
53
54         cancel_delayed_work_sync(&sbi->sb_work);
55 }
56
57 static int
58 affs_sync_fs(struct super_block *sb, int wait)
59 {
60         affs_commit_super(sb, wait);
61         return 0;
62 }
63
64 static void flush_superblock(struct work_struct *work)
65 {
66         struct affs_sb_info *sbi;
67         struct super_block *sb;
68
69         sbi = container_of(work, struct affs_sb_info, sb_work.work);
70         sb = sbi->sb;
71
72         spin_lock(&sbi->work_lock);
73         sbi->work_queued = 0;
74         spin_unlock(&sbi->work_lock);
75
76         affs_commit_super(sb, 1);
77 }
78
79 void affs_mark_sb_dirty(struct super_block *sb)
80 {
81         struct affs_sb_info *sbi = AFFS_SB(sb);
82         unsigned long delay;
83
84         if (sb_rdonly(sb))
85                return;
86
87         spin_lock(&sbi->work_lock);
88         if (!sbi->work_queued) {
89                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
90                queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
91                sbi->work_queued = 1;
92         }
93         spin_unlock(&sbi->work_lock);
94 }
95
96 static struct kmem_cache * affs_inode_cachep;
97
98 static struct inode *affs_alloc_inode(struct super_block *sb)
99 {
100         struct affs_inode_info *i;
101
102         i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103         if (!i)
104                 return NULL;
105
106         inode_set_iversion(&i->vfs_inode, 1);
107         i->i_lc = NULL;
108         i->i_ext_bh = NULL;
109         i->i_pa_cnt = 0;
110
111         return &i->vfs_inode;
112 }
113
114 static void affs_i_callback(struct rcu_head *head)
115 {
116         struct inode *inode = container_of(head, struct inode, i_rcu);
117         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118 }
119
120 static void affs_destroy_inode(struct inode *inode)
121 {
122         call_rcu(&inode->i_rcu, affs_i_callback);
123 }
124
125 static void init_once(void *foo)
126 {
127         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128
129         sema_init(&ei->i_link_lock, 1);
130         sema_init(&ei->i_ext_lock, 1);
131         inode_init_once(&ei->vfs_inode);
132 }
133
134 static int __init init_inodecache(void)
135 {
136         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137                                              sizeof(struct affs_inode_info),
138                                              0, (SLAB_RECLAIM_ACCOUNT|
139                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
140                                              init_once);
141         if (affs_inode_cachep == NULL)
142                 return -ENOMEM;
143         return 0;
144 }
145
146 static void destroy_inodecache(void)
147 {
148         /*
149          * Make sure all delayed rcu free inodes are flushed before we
150          * destroy cache.
151          */
152         rcu_barrier();
153         kmem_cache_destroy(affs_inode_cachep);
154 }
155
156 static const struct super_operations affs_sops = {
157         .alloc_inode    = affs_alloc_inode,
158         .destroy_inode  = affs_destroy_inode,
159         .write_inode    = affs_write_inode,
160         .evict_inode    = affs_evict_inode,
161         .put_super      = affs_put_super,
162         .sync_fs        = affs_sync_fs,
163         .statfs         = affs_statfs,
164         .remount_fs     = affs_remount,
165         .show_options   = affs_show_options,
166 };
167
168 enum {
169         Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
170         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172 };
173
174 static const match_table_t tokens = {
175         {Opt_bs, "bs=%u"},
176         {Opt_mode, "mode=%o"},
177         {Opt_mufs, "mufs"},
178         {Opt_notruncate, "nofilenametruncate"},
179         {Opt_prefix, "prefix=%s"},
180         {Opt_protect, "protect"},
181         {Opt_reserved, "reserved=%u"},
182         {Opt_root, "root=%u"},
183         {Opt_setgid, "setgid=%u"},
184         {Opt_setuid, "setuid=%u"},
185         {Opt_verbose, "verbose"},
186         {Opt_volume, "volume=%s"},
187         {Opt_ignore, "grpquota"},
188         {Opt_ignore, "noquota"},
189         {Opt_ignore, "quota"},
190         {Opt_ignore, "usrquota"},
191         {Opt_err, NULL},
192 };
193
194 static int
195 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
196                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197 {
198         char *p;
199         substring_t args[MAX_OPT_ARGS];
200
201         /* Fill in defaults */
202
203         *uid        = current_uid();
204         *gid        = current_gid();
205         *reserved   = 2;
206         *root       = -1;
207         *blocksize  = -1;
208         volume[0]   = ':';
209         volume[1]   = 0;
210         *mount_opts = 0;
211         if (!options)
212                 return 1;
213
214         while ((p = strsep(&options, ",")) != NULL) {
215                 int token, n, option;
216                 if (!*p)
217                         continue;
218
219                 token = match_token(p, tokens, args);
220                 switch (token) {
221                 case Opt_bs:
222                         if (match_int(&args[0], &n))
223                                 return 0;
224                         if (n != 512 && n != 1024 && n != 2048
225                             && n != 4096) {
226                                 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227                                 return 0;
228                         }
229                         *blocksize = n;
230                         break;
231                 case Opt_mode:
232                         if (match_octal(&args[0], &option))
233                                 return 0;
234                         *mode = option & 0777;
235                         affs_set_opt(*mount_opts, SF_SETMODE);
236                         break;
237                 case Opt_mufs:
238                         affs_set_opt(*mount_opts, SF_MUFS);
239                         break;
240                 case Opt_notruncate:
241                         affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
242                         break;
243                 case Opt_prefix:
244                         kfree(*prefix);
245                         *prefix = match_strdup(&args[0]);
246                         if (!*prefix)
247                                 return 0;
248                         affs_set_opt(*mount_opts, SF_PREFIX);
249                         break;
250                 case Opt_protect:
251                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
252                         break;
253                 case Opt_reserved:
254                         if (match_int(&args[0], reserved))
255                                 return 0;
256                         break;
257                 case Opt_root:
258                         if (match_int(&args[0], root))
259                                 return 0;
260                         break;
261                 case Opt_setgid:
262                         if (match_int(&args[0], &option))
263                                 return 0;
264                         *gid = make_kgid(current_user_ns(), option);
265                         if (!gid_valid(*gid))
266                                 return 0;
267                         affs_set_opt(*mount_opts, SF_SETGID);
268                         break;
269                 case Opt_setuid:
270                         if (match_int(&args[0], &option))
271                                 return 0;
272                         *uid = make_kuid(current_user_ns(), option);
273                         if (!uid_valid(*uid))
274                                 return 0;
275                         affs_set_opt(*mount_opts, SF_SETUID);
276                         break;
277                 case Opt_verbose:
278                         affs_set_opt(*mount_opts, SF_VERBOSE);
279                         break;
280                 case Opt_volume: {
281                         char *vol = match_strdup(&args[0]);
282                         if (!vol)
283                                 return 0;
284                         strlcpy(volume, vol, 32);
285                         kfree(vol);
286                         break;
287                 }
288                 case Opt_ignore:
289                         /* Silently ignore the quota options */
290                         break;
291                 default:
292                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
293                                 p);
294                         return 0;
295                 }
296         }
297         return 1;
298 }
299
300 static int affs_show_options(struct seq_file *m, struct dentry *root)
301 {
302         struct super_block *sb = root->d_sb;
303         struct affs_sb_info *sbi = AFFS_SB(sb);
304
305         if (sb->s_blocksize)
306                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
307         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
308                 seq_printf(m, ",mode=%o", sbi->s_mode);
309         if (affs_test_opt(sbi->s_flags, SF_MUFS))
310                 seq_puts(m, ",mufs");
311         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
312                 seq_puts(m, ",nofilenametruncate");
313         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
314                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
315         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
316                 seq_puts(m, ",protect");
317         if (sbi->s_reserved != 2)
318                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
319         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
320                 seq_printf(m, ",root=%u", sbi->s_root_block);
321         if (affs_test_opt(sbi->s_flags, SF_SETGID))
322                 seq_printf(m, ",setgid=%u",
323                            from_kgid_munged(&init_user_ns, sbi->s_gid));
324         if (affs_test_opt(sbi->s_flags, SF_SETUID))
325                 seq_printf(m, ",setuid=%u",
326                            from_kuid_munged(&init_user_ns, sbi->s_uid));
327         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
328                 seq_puts(m, ",verbose");
329         if (sbi->s_volume[0])
330                 seq_printf(m, ",volume=%s", sbi->s_volume);
331         return 0;
332 }
333
334 /* This function definitely needs to be split up. Some fine day I'll
335  * hopefully have the guts to do so. Until then: sorry for the mess.
336  */
337
338 static int affs_fill_super(struct super_block *sb, void *data, int silent)
339 {
340         struct affs_sb_info     *sbi;
341         struct buffer_head      *root_bh = NULL;
342         struct buffer_head      *boot_bh;
343         struct inode            *root_inode = NULL;
344         s32                      root_block;
345         int                      size, blocksize;
346         u32                      chksum;
347         int                      num_bm;
348         int                      i, j;
349         kuid_t                   uid;
350         kgid_t                   gid;
351         int                      reserved;
352         unsigned long            mount_flags;
353         int                      tmp_flags;     /* fix remount prototype... */
354         u8                       sig[4];
355         int                      ret;
356
357         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
358
359         sb->s_magic             = AFFS_SUPER_MAGIC;
360         sb->s_op                = &affs_sops;
361         sb->s_flags |= SB_NODIRATIME;
362
363         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
364         if (!sbi)
365                 return -ENOMEM;
366
367         sb->s_fs_info = sbi;
368         sbi->sb = sb;
369         mutex_init(&sbi->s_bmlock);
370         spin_lock_init(&sbi->symlink_lock);
371         spin_lock_init(&sbi->work_lock);
372         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
373
374         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
375                                 &blocksize,&sbi->s_prefix,
376                                 sbi->s_volume, &mount_flags)) {
377                 pr_err("Error parsing options\n");
378                 return -EINVAL;
379         }
380         /* N.B. after this point s_prefix must be released */
381
382         sbi->s_flags   = mount_flags;
383         sbi->s_mode    = i;
384         sbi->s_uid     = uid;
385         sbi->s_gid     = gid;
386         sbi->s_reserved= reserved;
387
388         /* Get the size of the device in 512-byte blocks.
389          * If we later see that the partition uses bigger
390          * blocks, we will have to change it.
391          */
392
393         size = i_size_read(sb->s_bdev->bd_inode) >> 9;
394         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
395
396         affs_set_blocksize(sb, PAGE_SIZE);
397         /* Try to find root block. Its location depends on the block size. */
398
399         i = bdev_logical_block_size(sb->s_bdev);
400         j = PAGE_SIZE;
401         if (blocksize > 0) {
402                 i = j = blocksize;
403                 size = size / (blocksize / 512);
404         }
405
406         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
407                 sbi->s_root_block = root_block;
408                 if (root_block < 0)
409                         sbi->s_root_block = (reserved + size - 1) / 2;
410                 pr_debug("setting blocksize to %d\n", blocksize);
411                 affs_set_blocksize(sb, blocksize);
412                 sbi->s_partition_size = size;
413
414                 /* The root block location that was calculated above is not
415                  * correct if the partition size is an odd number of 512-
416                  * byte blocks, which will be rounded down to a number of
417                  * 1024-byte blocks, and if there were an even number of
418                  * reserved blocks. Ideally, all partition checkers should
419                  * report the real number of blocks of the real blocksize,
420                  * but since this just cannot be done, we have to try to
421                  * find the root block anyways. In the above case, it is one
422                  * block behind the calculated one. So we check this one, too.
423                  */
424                 for (num_bm = 0; num_bm < 2; num_bm++) {
425                         pr_debug("Dev %s, trying root=%u, bs=%d, "
426                                 "size=%d, reserved=%d\n",
427                                 sb->s_id,
428                                 sbi->s_root_block + num_bm,
429                                 blocksize, size, reserved);
430                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
431                         if (!root_bh)
432                                 continue;
433                         if (!affs_checksum_block(sb, root_bh) &&
434                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
435                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
436                                 sbi->s_hashsize    = blocksize / 4 - 56;
437                                 sbi->s_root_block += num_bm;
438                                 goto got_root;
439                         }
440                         affs_brelse(root_bh);
441                         root_bh = NULL;
442                 }
443         }
444         if (!silent)
445                 pr_err("No valid root block on device %s\n", sb->s_id);
446         return -EINVAL;
447
448         /* N.B. after this point bh must be released */
449 got_root:
450         /* Keep super block in cache */
451         sbi->s_root_bh = root_bh;
452         root_block = sbi->s_root_block;
453
454         /* Find out which kind of FS we have */
455         boot_bh = sb_bread(sb, 0);
456         if (!boot_bh) {
457                 pr_err("Cannot read boot block\n");
458                 return -EINVAL;
459         }
460         memcpy(sig, boot_bh->b_data, 4);
461         brelse(boot_bh);
462         chksum = be32_to_cpu(*(__be32 *)sig);
463
464         /* Dircache filesystems are compatible with non-dircache ones
465          * when reading. As long as they aren't supported, writing is
466          * not recommended.
467          */
468         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
469              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
470                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
471                 sb->s_flags |= SB_RDONLY;
472         }
473         switch (chksum) {
474         case MUFS_FS:
475         case MUFS_INTLFFS:
476         case MUFS_DCFFS:
477                 affs_set_opt(sbi->s_flags, SF_MUFS);
478                 /* fall thru */
479         case FS_INTLFFS:
480         case FS_DCFFS:
481                 affs_set_opt(sbi->s_flags, SF_INTL);
482                 break;
483         case MUFS_FFS:
484                 affs_set_opt(sbi->s_flags, SF_MUFS);
485                 break;
486         case FS_FFS:
487                 break;
488         case MUFS_OFS:
489                 affs_set_opt(sbi->s_flags, SF_MUFS);
490                 /* fall thru */
491         case FS_OFS:
492                 affs_set_opt(sbi->s_flags, SF_OFS);
493                 sb->s_flags |= SB_NOEXEC;
494                 break;
495         case MUFS_DCOFS:
496         case MUFS_INTLOFS:
497                 affs_set_opt(sbi->s_flags, SF_MUFS);
498         case FS_DCOFS:
499         case FS_INTLOFS:
500                 affs_set_opt(sbi->s_flags, SF_INTL);
501                 affs_set_opt(sbi->s_flags, SF_OFS);
502                 sb->s_flags |= SB_NOEXEC;
503                 break;
504         default:
505                 pr_err("Unknown filesystem on device %s: %08X\n",
506                        sb->s_id, chksum);
507                 return -EINVAL;
508         }
509
510         if (affs_test_opt(mount_flags, SF_VERBOSE)) {
511                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
512                 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
513                         len > 31 ? 31 : len,
514                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
515                         sig, sig[3] + '0', blocksize);
516         }
517
518         sb->s_flags |= SB_NODEV | SB_NOSUID;
519
520         sbi->s_data_blksize = sb->s_blocksize;
521         if (affs_test_opt(sbi->s_flags, SF_OFS))
522                 sbi->s_data_blksize -= 24;
523
524         tmp_flags = sb->s_flags;
525         ret = affs_init_bitmap(sb, &tmp_flags);
526         if (ret)
527                 return ret;
528         sb->s_flags = tmp_flags;
529
530         /* set up enough so that it can read an inode */
531
532         root_inode = affs_iget(sb, root_block);
533         if (IS_ERR(root_inode))
534                 return PTR_ERR(root_inode);
535
536         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
537                 sb->s_d_op = &affs_intl_dentry_operations;
538         else
539                 sb->s_d_op = &affs_dentry_operations;
540
541         sb->s_root = d_make_root(root_inode);
542         if (!sb->s_root) {
543                 pr_err("AFFS: Get root inode failed\n");
544                 return -ENOMEM;
545         }
546
547         sb->s_export_op = &affs_export_ops;
548         pr_debug("s_flags=%lX\n", sb->s_flags);
549         return 0;
550 }
551
552 static int
553 affs_remount(struct super_block *sb, int *flags, char *data)
554 {
555         struct affs_sb_info     *sbi = AFFS_SB(sb);
556         int                      blocksize;
557         kuid_t                   uid;
558         kgid_t                   gid;
559         int                      mode;
560         int                      reserved;
561         int                      root_block;
562         unsigned long            mount_flags;
563         int                      res = 0;
564         char                    *new_opts;
565         char                     volume[32];
566         char                    *prefix = NULL;
567
568         new_opts = kstrdup(data, GFP_KERNEL);
569         if (data && !new_opts)
570                 return -ENOMEM;
571
572         pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
573
574         sync_filesystem(sb);
575         *flags |= SB_NODIRATIME;
576
577         memcpy(volume, sbi->s_volume, 32);
578         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
579                            &blocksize, &prefix, volume,
580                            &mount_flags)) {
581                 kfree(prefix);
582                 kfree(new_opts);
583                 return -EINVAL;
584         }
585
586         flush_delayed_work(&sbi->sb_work);
587
588         sbi->s_flags = mount_flags;
589         sbi->s_mode  = mode;
590         sbi->s_uid   = uid;
591         sbi->s_gid   = gid;
592         /* protect against readers */
593         spin_lock(&sbi->symlink_lock);
594         if (prefix) {
595                 kfree(sbi->s_prefix);
596                 sbi->s_prefix = prefix;
597         }
598         memcpy(sbi->s_volume, volume, 32);
599         spin_unlock(&sbi->symlink_lock);
600
601         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
602                 return 0;
603
604         if (*flags & SB_RDONLY)
605                 affs_free_bitmap(sb);
606         else
607                 res = affs_init_bitmap(sb, flags);
608
609         return res;
610 }
611
612 static int
613 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
614 {
615         struct super_block *sb = dentry->d_sb;
616         int              free;
617         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
618
619         pr_debug("%s() partsize=%d, reserved=%d\n",
620                  __func__, AFFS_SB(sb)->s_partition_size,
621                  AFFS_SB(sb)->s_reserved);
622
623         free          = affs_count_free_blocks(sb);
624         buf->f_type    = AFFS_SUPER_MAGIC;
625         buf->f_bsize   = sb->s_blocksize;
626         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
627         buf->f_bfree   = free;
628         buf->f_bavail  = free;
629         buf->f_fsid.val[0] = (u32)id;
630         buf->f_fsid.val[1] = (u32)(id >> 32);
631         buf->f_namelen = AFFSNAMEMAX;
632         return 0;
633 }
634
635 static struct dentry *affs_mount(struct file_system_type *fs_type,
636         int flags, const char *dev_name, void *data)
637 {
638         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
639 }
640
641 static void affs_kill_sb(struct super_block *sb)
642 {
643         struct affs_sb_info *sbi = AFFS_SB(sb);
644         kill_block_super(sb);
645         if (sbi) {
646                 affs_free_bitmap(sb);
647                 affs_brelse(sbi->s_root_bh);
648                 kfree(sbi->s_prefix);
649                 mutex_destroy(&sbi->s_bmlock);
650                 kfree(sbi);
651         }
652 }
653
654 static struct file_system_type affs_fs_type = {
655         .owner          = THIS_MODULE,
656         .name           = "affs",
657         .mount          = affs_mount,
658         .kill_sb        = affs_kill_sb,
659         .fs_flags       = FS_REQUIRES_DEV,
660 };
661 MODULE_ALIAS_FS("affs");
662
663 static int __init init_affs_fs(void)
664 {
665         int err = init_inodecache();
666         if (err)
667                 goto out1;
668         err = register_filesystem(&affs_fs_type);
669         if (err)
670                 goto out;
671         return 0;
672 out:
673         destroy_inodecache();
674 out1:
675         return err;
676 }
677
678 static void __exit exit_affs_fs(void)
679 {
680         unregister_filesystem(&affs_fs_type);
681         destroy_inodecache();
682 }
683
684 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
685 MODULE_LICENSE("GPL");
686
687 module_init(init_affs_fs)
688 module_exit(exit_affs_fs)