Merge tag 'Wimplicit-fallthrough-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kerne...
[sfrench/cifs-2.6.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_free_inode(struct inode *inode)
115 {
116         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
117 }
118
119 static void init_once(void *foo)
120 {
121         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
122
123         sema_init(&ei->i_link_lock, 1);
124         sema_init(&ei->i_ext_lock, 1);
125         inode_init_once(&ei->vfs_inode);
126 }
127
128 static int __init init_inodecache(void)
129 {
130         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
131                                              sizeof(struct affs_inode_info),
132                                              0, (SLAB_RECLAIM_ACCOUNT|
133                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
134                                              init_once);
135         if (affs_inode_cachep == NULL)
136                 return -ENOMEM;
137         return 0;
138 }
139
140 static void destroy_inodecache(void)
141 {
142         /*
143          * Make sure all delayed rcu free inodes are flushed before we
144          * destroy cache.
145          */
146         rcu_barrier();
147         kmem_cache_destroy(affs_inode_cachep);
148 }
149
150 static const struct super_operations affs_sops = {
151         .alloc_inode    = affs_alloc_inode,
152         .free_inode     = affs_free_inode,
153         .write_inode    = affs_write_inode,
154         .evict_inode    = affs_evict_inode,
155         .put_super      = affs_put_super,
156         .sync_fs        = affs_sync_fs,
157         .statfs         = affs_statfs,
158         .remount_fs     = affs_remount,
159         .show_options   = affs_show_options,
160 };
161
162 enum {
163         Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
164         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
165         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
166 };
167
168 static const match_table_t tokens = {
169         {Opt_bs, "bs=%u"},
170         {Opt_mode, "mode=%o"},
171         {Opt_mufs, "mufs"},
172         {Opt_notruncate, "nofilenametruncate"},
173         {Opt_prefix, "prefix=%s"},
174         {Opt_protect, "protect"},
175         {Opt_reserved, "reserved=%u"},
176         {Opt_root, "root=%u"},
177         {Opt_setgid, "setgid=%u"},
178         {Opt_setuid, "setuid=%u"},
179         {Opt_verbose, "verbose"},
180         {Opt_volume, "volume=%s"},
181         {Opt_ignore, "grpquota"},
182         {Opt_ignore, "noquota"},
183         {Opt_ignore, "quota"},
184         {Opt_ignore, "usrquota"},
185         {Opt_err, NULL},
186 };
187
188 static int
189 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
190                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
191 {
192         char *p;
193         substring_t args[MAX_OPT_ARGS];
194
195         /* Fill in defaults */
196
197         *uid        = current_uid();
198         *gid        = current_gid();
199         *reserved   = 2;
200         *root       = -1;
201         *blocksize  = -1;
202         volume[0]   = ':';
203         volume[1]   = 0;
204         *mount_opts = 0;
205         if (!options)
206                 return 1;
207
208         while ((p = strsep(&options, ",")) != NULL) {
209                 int token, n, option;
210                 if (!*p)
211                         continue;
212
213                 token = match_token(p, tokens, args);
214                 switch (token) {
215                 case Opt_bs:
216                         if (match_int(&args[0], &n))
217                                 return 0;
218                         if (n != 512 && n != 1024 && n != 2048
219                             && n != 4096) {
220                                 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
221                                 return 0;
222                         }
223                         *blocksize = n;
224                         break;
225                 case Opt_mode:
226                         if (match_octal(&args[0], &option))
227                                 return 0;
228                         *mode = option & 0777;
229                         affs_set_opt(*mount_opts, SF_SETMODE);
230                         break;
231                 case Opt_mufs:
232                         affs_set_opt(*mount_opts, SF_MUFS);
233                         break;
234                 case Opt_notruncate:
235                         affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
236                         break;
237                 case Opt_prefix:
238                         kfree(*prefix);
239                         *prefix = match_strdup(&args[0]);
240                         if (!*prefix)
241                                 return 0;
242                         affs_set_opt(*mount_opts, SF_PREFIX);
243                         break;
244                 case Opt_protect:
245                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
246                         break;
247                 case Opt_reserved:
248                         if (match_int(&args[0], reserved))
249                                 return 0;
250                         break;
251                 case Opt_root:
252                         if (match_int(&args[0], root))
253                                 return 0;
254                         break;
255                 case Opt_setgid:
256                         if (match_int(&args[0], &option))
257                                 return 0;
258                         *gid = make_kgid(current_user_ns(), option);
259                         if (!gid_valid(*gid))
260                                 return 0;
261                         affs_set_opt(*mount_opts, SF_SETGID);
262                         break;
263                 case Opt_setuid:
264                         if (match_int(&args[0], &option))
265                                 return 0;
266                         *uid = make_kuid(current_user_ns(), option);
267                         if (!uid_valid(*uid))
268                                 return 0;
269                         affs_set_opt(*mount_opts, SF_SETUID);
270                         break;
271                 case Opt_verbose:
272                         affs_set_opt(*mount_opts, SF_VERBOSE);
273                         break;
274                 case Opt_volume: {
275                         char *vol = match_strdup(&args[0]);
276                         if (!vol)
277                                 return 0;
278                         strlcpy(volume, vol, 32);
279                         kfree(vol);
280                         break;
281                 }
282                 case Opt_ignore:
283                         /* Silently ignore the quota options */
284                         break;
285                 default:
286                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
287                                 p);
288                         return 0;
289                 }
290         }
291         return 1;
292 }
293
294 static int affs_show_options(struct seq_file *m, struct dentry *root)
295 {
296         struct super_block *sb = root->d_sb;
297         struct affs_sb_info *sbi = AFFS_SB(sb);
298
299         if (sb->s_blocksize)
300                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
301         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
302                 seq_printf(m, ",mode=%o", sbi->s_mode);
303         if (affs_test_opt(sbi->s_flags, SF_MUFS))
304                 seq_puts(m, ",mufs");
305         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
306                 seq_puts(m, ",nofilenametruncate");
307         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
308                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
309         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
310                 seq_puts(m, ",protect");
311         if (sbi->s_reserved != 2)
312                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
313         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
314                 seq_printf(m, ",root=%u", sbi->s_root_block);
315         if (affs_test_opt(sbi->s_flags, SF_SETGID))
316                 seq_printf(m, ",setgid=%u",
317                            from_kgid_munged(&init_user_ns, sbi->s_gid));
318         if (affs_test_opt(sbi->s_flags, SF_SETUID))
319                 seq_printf(m, ",setuid=%u",
320                            from_kuid_munged(&init_user_ns, sbi->s_uid));
321         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
322                 seq_puts(m, ",verbose");
323         if (sbi->s_volume[0])
324                 seq_printf(m, ",volume=%s", sbi->s_volume);
325         return 0;
326 }
327
328 /* This function definitely needs to be split up. Some fine day I'll
329  * hopefully have the guts to do so. Until then: sorry for the mess.
330  */
331
332 static int affs_fill_super(struct super_block *sb, void *data, int silent)
333 {
334         struct affs_sb_info     *sbi;
335         struct buffer_head      *root_bh = NULL;
336         struct buffer_head      *boot_bh;
337         struct inode            *root_inode = NULL;
338         s32                      root_block;
339         int                      size, blocksize;
340         u32                      chksum;
341         int                      num_bm;
342         int                      i, j;
343         kuid_t                   uid;
344         kgid_t                   gid;
345         int                      reserved;
346         unsigned long            mount_flags;
347         int                      tmp_flags;     /* fix remount prototype... */
348         u8                       sig[4];
349         int                      ret;
350
351         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
352
353         sb->s_magic             = AFFS_SUPER_MAGIC;
354         sb->s_op                = &affs_sops;
355         sb->s_flags |= SB_NODIRATIME;
356
357         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
358         if (!sbi)
359                 return -ENOMEM;
360
361         sb->s_fs_info = sbi;
362         sbi->sb = sb;
363         mutex_init(&sbi->s_bmlock);
364         spin_lock_init(&sbi->symlink_lock);
365         spin_lock_init(&sbi->work_lock);
366         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
367
368         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
369                                 &blocksize,&sbi->s_prefix,
370                                 sbi->s_volume, &mount_flags)) {
371                 pr_err("Error parsing options\n");
372                 return -EINVAL;
373         }
374         /* N.B. after this point s_prefix must be released */
375
376         sbi->s_flags   = mount_flags;
377         sbi->s_mode    = i;
378         sbi->s_uid     = uid;
379         sbi->s_gid     = gid;
380         sbi->s_reserved= reserved;
381
382         /* Get the size of the device in 512-byte blocks.
383          * If we later see that the partition uses bigger
384          * blocks, we will have to change it.
385          */
386
387         size = i_size_read(sb->s_bdev->bd_inode) >> 9;
388         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
389
390         affs_set_blocksize(sb, PAGE_SIZE);
391         /* Try to find root block. Its location depends on the block size. */
392
393         i = bdev_logical_block_size(sb->s_bdev);
394         j = PAGE_SIZE;
395         if (blocksize > 0) {
396                 i = j = blocksize;
397                 size = size / (blocksize / 512);
398         }
399
400         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
401                 sbi->s_root_block = root_block;
402                 if (root_block < 0)
403                         sbi->s_root_block = (reserved + size - 1) / 2;
404                 pr_debug("setting blocksize to %d\n", blocksize);
405                 affs_set_blocksize(sb, blocksize);
406                 sbi->s_partition_size = size;
407
408                 /* The root block location that was calculated above is not
409                  * correct if the partition size is an odd number of 512-
410                  * byte blocks, which will be rounded down to a number of
411                  * 1024-byte blocks, and if there were an even number of
412                  * reserved blocks. Ideally, all partition checkers should
413                  * report the real number of blocks of the real blocksize,
414                  * but since this just cannot be done, we have to try to
415                  * find the root block anyways. In the above case, it is one
416                  * block behind the calculated one. So we check this one, too.
417                  */
418                 for (num_bm = 0; num_bm < 2; num_bm++) {
419                         pr_debug("Dev %s, trying root=%u, bs=%d, "
420                                 "size=%d, reserved=%d\n",
421                                 sb->s_id,
422                                 sbi->s_root_block + num_bm,
423                                 blocksize, size, reserved);
424                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
425                         if (!root_bh)
426                                 continue;
427                         if (!affs_checksum_block(sb, root_bh) &&
428                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
429                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
430                                 sbi->s_hashsize    = blocksize / 4 - 56;
431                                 sbi->s_root_block += num_bm;
432                                 goto got_root;
433                         }
434                         affs_brelse(root_bh);
435                         root_bh = NULL;
436                 }
437         }
438         if (!silent)
439                 pr_err("No valid root block on device %s\n", sb->s_id);
440         return -EINVAL;
441
442         /* N.B. after this point bh must be released */
443 got_root:
444         /* Keep super block in cache */
445         sbi->s_root_bh = root_bh;
446         root_block = sbi->s_root_block;
447
448         /* Find out which kind of FS we have */
449         boot_bh = sb_bread(sb, 0);
450         if (!boot_bh) {
451                 pr_err("Cannot read boot block\n");
452                 return -EINVAL;
453         }
454         memcpy(sig, boot_bh->b_data, 4);
455         brelse(boot_bh);
456         chksum = be32_to_cpu(*(__be32 *)sig);
457
458         /* Dircache filesystems are compatible with non-dircache ones
459          * when reading. As long as they aren't supported, writing is
460          * not recommended.
461          */
462         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
463              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
464                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
465                 sb->s_flags |= SB_RDONLY;
466         }
467         switch (chksum) {
468         case MUFS_FS:
469         case MUFS_INTLFFS:
470         case MUFS_DCFFS:
471                 affs_set_opt(sbi->s_flags, SF_MUFS);
472                 /* fall thru */
473         case FS_INTLFFS:
474         case FS_DCFFS:
475                 affs_set_opt(sbi->s_flags, SF_INTL);
476                 break;
477         case MUFS_FFS:
478                 affs_set_opt(sbi->s_flags, SF_MUFS);
479                 break;
480         case FS_FFS:
481                 break;
482         case MUFS_OFS:
483                 affs_set_opt(sbi->s_flags, SF_MUFS);
484                 /* fall through */
485         case FS_OFS:
486                 affs_set_opt(sbi->s_flags, SF_OFS);
487                 sb->s_flags |= SB_NOEXEC;
488                 break;
489         case MUFS_DCOFS:
490         case MUFS_INTLOFS:
491                 affs_set_opt(sbi->s_flags, SF_MUFS);
492                 /* fall through */
493         case FS_DCOFS:
494         case FS_INTLOFS:
495                 affs_set_opt(sbi->s_flags, SF_INTL);
496                 affs_set_opt(sbi->s_flags, SF_OFS);
497                 sb->s_flags |= SB_NOEXEC;
498                 break;
499         default:
500                 pr_err("Unknown filesystem on device %s: %08X\n",
501                        sb->s_id, chksum);
502                 return -EINVAL;
503         }
504
505         if (affs_test_opt(mount_flags, SF_VERBOSE)) {
506                 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
507                 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
508                         len > 31 ? 31 : len,
509                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
510                         sig, sig[3] + '0', blocksize);
511         }
512
513         sb->s_flags |= SB_NODEV | SB_NOSUID;
514
515         sbi->s_data_blksize = sb->s_blocksize;
516         if (affs_test_opt(sbi->s_flags, SF_OFS))
517                 sbi->s_data_blksize -= 24;
518
519         tmp_flags = sb->s_flags;
520         ret = affs_init_bitmap(sb, &tmp_flags);
521         if (ret)
522                 return ret;
523         sb->s_flags = tmp_flags;
524
525         /* set up enough so that it can read an inode */
526
527         root_inode = affs_iget(sb, root_block);
528         if (IS_ERR(root_inode))
529                 return PTR_ERR(root_inode);
530
531         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
532                 sb->s_d_op = &affs_intl_dentry_operations;
533         else
534                 sb->s_d_op = &affs_dentry_operations;
535
536         sb->s_root = d_make_root(root_inode);
537         if (!sb->s_root) {
538                 pr_err("AFFS: Get root inode failed\n");
539                 return -ENOMEM;
540         }
541
542         sb->s_export_op = &affs_export_ops;
543         pr_debug("s_flags=%lX\n", sb->s_flags);
544         return 0;
545 }
546
547 static int
548 affs_remount(struct super_block *sb, int *flags, char *data)
549 {
550         struct affs_sb_info     *sbi = AFFS_SB(sb);
551         int                      blocksize;
552         kuid_t                   uid;
553         kgid_t                   gid;
554         int                      mode;
555         int                      reserved;
556         int                      root_block;
557         unsigned long            mount_flags;
558         int                      res = 0;
559         char                    *new_opts;
560         char                     volume[32];
561         char                    *prefix = NULL;
562
563         new_opts = kstrdup(data, GFP_KERNEL);
564         if (data && !new_opts)
565                 return -ENOMEM;
566
567         pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
568
569         sync_filesystem(sb);
570         *flags |= SB_NODIRATIME;
571
572         memcpy(volume, sbi->s_volume, 32);
573         if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
574                            &blocksize, &prefix, volume,
575                            &mount_flags)) {
576                 kfree(prefix);
577                 kfree(new_opts);
578                 return -EINVAL;
579         }
580
581         flush_delayed_work(&sbi->sb_work);
582
583         sbi->s_flags = mount_flags;
584         sbi->s_mode  = mode;
585         sbi->s_uid   = uid;
586         sbi->s_gid   = gid;
587         /* protect against readers */
588         spin_lock(&sbi->symlink_lock);
589         if (prefix) {
590                 kfree(sbi->s_prefix);
591                 sbi->s_prefix = prefix;
592         }
593         memcpy(sbi->s_volume, volume, 32);
594         spin_unlock(&sbi->symlink_lock);
595
596         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
597                 return 0;
598
599         if (*flags & SB_RDONLY)
600                 affs_free_bitmap(sb);
601         else
602                 res = affs_init_bitmap(sb, flags);
603
604         return res;
605 }
606
607 static int
608 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
609 {
610         struct super_block *sb = dentry->d_sb;
611         int              free;
612         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
613
614         pr_debug("%s() partsize=%d, reserved=%d\n",
615                  __func__, AFFS_SB(sb)->s_partition_size,
616                  AFFS_SB(sb)->s_reserved);
617
618         free          = affs_count_free_blocks(sb);
619         buf->f_type    = AFFS_SUPER_MAGIC;
620         buf->f_bsize   = sb->s_blocksize;
621         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
622         buf->f_bfree   = free;
623         buf->f_bavail  = free;
624         buf->f_fsid.val[0] = (u32)id;
625         buf->f_fsid.val[1] = (u32)(id >> 32);
626         buf->f_namelen = AFFSNAMEMAX;
627         return 0;
628 }
629
630 static struct dentry *affs_mount(struct file_system_type *fs_type,
631         int flags, const char *dev_name, void *data)
632 {
633         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
634 }
635
636 static void affs_kill_sb(struct super_block *sb)
637 {
638         struct affs_sb_info *sbi = AFFS_SB(sb);
639         kill_block_super(sb);
640         if (sbi) {
641                 affs_free_bitmap(sb);
642                 affs_brelse(sbi->s_root_bh);
643                 kfree(sbi->s_prefix);
644                 mutex_destroy(&sbi->s_bmlock);
645                 kfree(sbi);
646         }
647 }
648
649 static struct file_system_type affs_fs_type = {
650         .owner          = THIS_MODULE,
651         .name           = "affs",
652         .mount          = affs_mount,
653         .kill_sb        = affs_kill_sb,
654         .fs_flags       = FS_REQUIRES_DEV,
655 };
656 MODULE_ALIAS_FS("affs");
657
658 static int __init init_affs_fs(void)
659 {
660         int err = init_inodecache();
661         if (err)
662                 goto out1;
663         err = register_filesystem(&affs_fs_type);
664         if (err)
665                 goto out;
666         return 0;
667 out:
668         destroy_inodecache();
669 out1:
670         return err;
671 }
672
673 static void __exit exit_affs_fs(void)
674 {
675         unregister_filesystem(&affs_fs_type);
676         destroy_inodecache();
677 }
678
679 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
680 MODULE_LICENSE("GPL");
681
682 module_init(init_affs_fs)
683 module_exit(exit_affs_fs)