GNU Linux-libre 5.19-rc6-gnu
[releases.git] / fs / affs / super.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/fs/affs/inode.c
4  *
5  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
6  *
7  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
8  *
9  *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
10  *
11  *  (C) 1991  Linus Torvalds - minix filesystem
12  */
13
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/statfs.h>
17 #include <linux/parser.h>
18 #include <linux/magic.h>
19 #include <linux/sched.h>
20 #include <linux/cred.h>
21 #include <linux/slab.h>
22 #include <linux/writeback.h>
23 #include <linux/blkdev.h>
24 #include <linux/seq_file.h>
25 #include <linux/iversion.h>
26 #include "affs.h"
27
28 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
29 static int affs_show_options(struct seq_file *m, struct dentry *root);
30 static int affs_remount (struct super_block *sb, int *flags, char *data);
31
32 static void
33 affs_commit_super(struct super_block *sb, int wait)
34 {
35         struct affs_sb_info *sbi = AFFS_SB(sb);
36         struct buffer_head *bh = sbi->s_root_bh;
37         struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
38
39         lock_buffer(bh);
40         affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
41         affs_fix_checksum(sb, bh);
42         unlock_buffer(bh);
43
44         mark_buffer_dirty(bh);
45         if (wait)
46                 sync_dirty_buffer(bh);
47 }
48
49 static void
50 affs_put_super(struct super_block *sb)
51 {
52         struct affs_sb_info *sbi = AFFS_SB(sb);
53         pr_debug("%s()\n", __func__);
54
55         cancel_delayed_work_sync(&sbi->sb_work);
56 }
57
58 static int
59 affs_sync_fs(struct super_block *sb, int wait)
60 {
61         affs_commit_super(sb, wait);
62         return 0;
63 }
64
65 static void flush_superblock(struct work_struct *work)
66 {
67         struct affs_sb_info *sbi;
68         struct super_block *sb;
69
70         sbi = container_of(work, struct affs_sb_info, sb_work.work);
71         sb = sbi->sb;
72
73         spin_lock(&sbi->work_lock);
74         sbi->work_queued = 0;
75         spin_unlock(&sbi->work_lock);
76
77         affs_commit_super(sb, 1);
78 }
79
80 void affs_mark_sb_dirty(struct super_block *sb)
81 {
82         struct affs_sb_info *sbi = AFFS_SB(sb);
83         unsigned long delay;
84
85         if (sb_rdonly(sb))
86                return;
87
88         spin_lock(&sbi->work_lock);
89         if (!sbi->work_queued) {
90                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
91                queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
92                sbi->work_queued = 1;
93         }
94         spin_unlock(&sbi->work_lock);
95 }
96
97 static struct kmem_cache * affs_inode_cachep;
98
99 static struct inode *affs_alloc_inode(struct super_block *sb)
100 {
101         struct affs_inode_info *i;
102
103         i = alloc_inode_sb(sb, affs_inode_cachep, GFP_KERNEL);
104         if (!i)
105                 return NULL;
106
107         inode_set_iversion(&i->vfs_inode, 1);
108         i->i_lc = NULL;
109         i->i_ext_bh = NULL;
110         i->i_pa_cnt = 0;
111
112         return &i->vfs_inode;
113 }
114
115 static void affs_free_inode(struct inode *inode)
116 {
117         kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118 }
119
120 static void init_once(void *foo)
121 {
122         struct affs_inode_info *ei = (struct affs_inode_info *) foo;
123
124         mutex_init(&ei->i_link_lock);
125         mutex_init(&ei->i_ext_lock);
126         inode_init_once(&ei->vfs_inode);
127 }
128
129 static int __init init_inodecache(void)
130 {
131         affs_inode_cachep = kmem_cache_create("affs_inode_cache",
132                                              sizeof(struct affs_inode_info),
133                                              0, (SLAB_RECLAIM_ACCOUNT|
134                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
135                                              init_once);
136         if (affs_inode_cachep == NULL)
137                 return -ENOMEM;
138         return 0;
139 }
140
141 static void destroy_inodecache(void)
142 {
143         /*
144          * Make sure all delayed rcu free inodes are flushed before we
145          * destroy cache.
146          */
147         rcu_barrier();
148         kmem_cache_destroy(affs_inode_cachep);
149 }
150
151 static const struct super_operations affs_sops = {
152         .alloc_inode    = affs_alloc_inode,
153         .free_inode     = affs_free_inode,
154         .write_inode    = affs_write_inode,
155         .evict_inode    = affs_evict_inode,
156         .put_super      = affs_put_super,
157         .sync_fs        = affs_sync_fs,
158         .statfs         = affs_statfs,
159         .remount_fs     = affs_remount,
160         .show_options   = affs_show_options,
161 };
162
163 enum {
164         Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
165         Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
166         Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
167 };
168
169 static const match_table_t tokens = {
170         {Opt_bs, "bs=%u"},
171         {Opt_mode, "mode=%o"},
172         {Opt_mufs, "mufs"},
173         {Opt_notruncate, "nofilenametruncate"},
174         {Opt_prefix, "prefix=%s"},
175         {Opt_protect, "protect"},
176         {Opt_reserved, "reserved=%u"},
177         {Opt_root, "root=%u"},
178         {Opt_setgid, "setgid=%u"},
179         {Opt_setuid, "setuid=%u"},
180         {Opt_verbose, "verbose"},
181         {Opt_volume, "volume=%s"},
182         {Opt_ignore, "grpquota"},
183         {Opt_ignore, "noquota"},
184         {Opt_ignore, "quota"},
185         {Opt_ignore, "usrquota"},
186         {Opt_err, NULL},
187 };
188
189 static int
190 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
191                 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
192 {
193         char *p;
194         substring_t args[MAX_OPT_ARGS];
195
196         /* Fill in defaults */
197
198         *uid        = current_uid();
199         *gid        = current_gid();
200         *reserved   = 2;
201         *root       = -1;
202         *blocksize  = -1;
203         volume[0]   = ':';
204         volume[1]   = 0;
205         *mount_opts = 0;
206         if (!options)
207                 return 1;
208
209         while ((p = strsep(&options, ",")) != NULL) {
210                 int token, n, option;
211                 if (!*p)
212                         continue;
213
214                 token = match_token(p, tokens, args);
215                 switch (token) {
216                 case Opt_bs:
217                         if (match_int(&args[0], &n))
218                                 return 0;
219                         if (n != 512 && n != 1024 && n != 2048
220                             && n != 4096) {
221                                 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
222                                 return 0;
223                         }
224                         *blocksize = n;
225                         break;
226                 case Opt_mode:
227                         if (match_octal(&args[0], &option))
228                                 return 0;
229                         *mode = option & 0777;
230                         affs_set_opt(*mount_opts, SF_SETMODE);
231                         break;
232                 case Opt_mufs:
233                         affs_set_opt(*mount_opts, SF_MUFS);
234                         break;
235                 case Opt_notruncate:
236                         affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
237                         break;
238                 case Opt_prefix:
239                         kfree(*prefix);
240                         *prefix = match_strdup(&args[0]);
241                         if (!*prefix)
242                                 return 0;
243                         affs_set_opt(*mount_opts, SF_PREFIX);
244                         break;
245                 case Opt_protect:
246                         affs_set_opt(*mount_opts, SF_IMMUTABLE);
247                         break;
248                 case Opt_reserved:
249                         if (match_int(&args[0], reserved))
250                                 return 0;
251                         break;
252                 case Opt_root:
253                         if (match_int(&args[0], root))
254                                 return 0;
255                         break;
256                 case Opt_setgid:
257                         if (match_int(&args[0], &option))
258                                 return 0;
259                         *gid = make_kgid(current_user_ns(), option);
260                         if (!gid_valid(*gid))
261                                 return 0;
262                         affs_set_opt(*mount_opts, SF_SETGID);
263                         break;
264                 case Opt_setuid:
265                         if (match_int(&args[0], &option))
266                                 return 0;
267                         *uid = make_kuid(current_user_ns(), option);
268                         if (!uid_valid(*uid))
269                                 return 0;
270                         affs_set_opt(*mount_opts, SF_SETUID);
271                         break;
272                 case Opt_verbose:
273                         affs_set_opt(*mount_opts, SF_VERBOSE);
274                         break;
275                 case Opt_volume: {
276                         char *vol = match_strdup(&args[0]);
277                         if (!vol)
278                                 return 0;
279                         strlcpy(volume, vol, 32);
280                         kfree(vol);
281                         break;
282                 }
283                 case Opt_ignore:
284                         /* Silently ignore the quota options */
285                         break;
286                 default:
287                         pr_warn("Unrecognized mount option \"%s\" or missing value\n",
288                                 p);
289                         return 0;
290                 }
291         }
292         return 1;
293 }
294
295 static int affs_show_options(struct seq_file *m, struct dentry *root)
296 {
297         struct super_block *sb = root->d_sb;
298         struct affs_sb_info *sbi = AFFS_SB(sb);
299
300         if (sb->s_blocksize)
301                 seq_printf(m, ",bs=%lu", sb->s_blocksize);
302         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
303                 seq_printf(m, ",mode=%o", sbi->s_mode);
304         if (affs_test_opt(sbi->s_flags, SF_MUFS))
305                 seq_puts(m, ",mufs");
306         if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
307                 seq_puts(m, ",nofilenametruncate");
308         if (affs_test_opt(sbi->s_flags, SF_PREFIX))
309                 seq_printf(m, ",prefix=%s", sbi->s_prefix);
310         if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
311                 seq_puts(m, ",protect");
312         if (sbi->s_reserved != 2)
313                 seq_printf(m, ",reserved=%u", sbi->s_reserved);
314         if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
315                 seq_printf(m, ",root=%u", sbi->s_root_block);
316         if (affs_test_opt(sbi->s_flags, SF_SETGID))
317                 seq_printf(m, ",setgid=%u",
318                            from_kgid_munged(&init_user_ns, sbi->s_gid));
319         if (affs_test_opt(sbi->s_flags, SF_SETUID))
320                 seq_printf(m, ",setuid=%u",
321                            from_kuid_munged(&init_user_ns, sbi->s_uid));
322         if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
323                 seq_puts(m, ",verbose");
324         if (sbi->s_volume[0])
325                 seq_printf(m, ",volume=%s", sbi->s_volume);
326         return 0;
327 }
328
329 /* This function definitely needs to be split up. Some fine day I'll
330  * hopefully have the guts to do so. Until then: sorry for the mess.
331  */
332
333 static int affs_fill_super(struct super_block *sb, void *data, int silent)
334 {
335         struct affs_sb_info     *sbi;
336         struct buffer_head      *root_bh = NULL;
337         struct buffer_head      *boot_bh;
338         struct inode            *root_inode = NULL;
339         s32                      root_block;
340         int                      size, blocksize;
341         u32                      chksum;
342         int                      num_bm;
343         int                      i, j;
344         kuid_t                   uid;
345         kgid_t                   gid;
346         int                      reserved;
347         unsigned long            mount_flags;
348         int                      tmp_flags;     /* fix remount prototype... */
349         u8                       sig[4];
350         int                      ret;
351
352         pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
353
354         sb->s_magic             = AFFS_SUPER_MAGIC;
355         sb->s_op                = &affs_sops;
356         sb->s_flags |= SB_NODIRATIME;
357
358         sb->s_time_gran = NSEC_PER_SEC;
359         sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
360         sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
361
362         sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
363         if (!sbi)
364                 return -ENOMEM;
365
366         sb->s_fs_info = sbi;
367         sbi->sb = sb;
368         mutex_init(&sbi->s_bmlock);
369         spin_lock_init(&sbi->symlink_lock);
370         spin_lock_init(&sbi->work_lock);
371         INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
372
373         if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
374                                 &blocksize,&sbi->s_prefix,
375                                 sbi->s_volume, &mount_flags)) {
376                 pr_err("Error parsing options\n");
377                 return -EINVAL;
378         }
379         /* N.B. after this point s_prefix must be released */
380
381         sbi->s_flags   = mount_flags;
382         sbi->s_mode    = i;
383         sbi->s_uid     = uid;
384         sbi->s_gid     = gid;
385         sbi->s_reserved= reserved;
386
387         /* Get the size of the device in 512-byte blocks.
388          * If we later see that the partition uses bigger
389          * blocks, we will have to change it.
390          */
391
392         size = bdev_nr_sectors(sb->s_bdev);
393         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
394
395         affs_set_blocksize(sb, PAGE_SIZE);
396         /* Try to find root block. Its location depends on the block size. */
397
398         i = bdev_logical_block_size(sb->s_bdev);
399         j = PAGE_SIZE;
400         if (blocksize > 0) {
401                 i = j = blocksize;
402                 size = size / (blocksize / 512);
403         }
404
405         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
406                 sbi->s_root_block = root_block;
407                 if (root_block < 0)
408                         sbi->s_root_block = (reserved + size - 1) / 2;
409                 pr_debug("setting blocksize to %d\n", blocksize);
410                 affs_set_blocksize(sb, blocksize);
411                 sbi->s_partition_size = size;
412
413                 /* The root block location that was calculated above is not
414                  * correct if the partition size is an odd number of 512-
415                  * byte blocks, which will be rounded down to a number of
416                  * 1024-byte blocks, and if there were an even number of
417                  * reserved blocks. Ideally, all partition checkers should
418                  * report the real number of blocks of the real blocksize,
419                  * but since this just cannot be done, we have to try to
420                  * find the root block anyways. In the above case, it is one
421                  * block behind the calculated one. So we check this one, too.
422                  */
423                 for (num_bm = 0; num_bm < 2; num_bm++) {
424                         pr_debug("Dev %s, trying root=%u, bs=%d, "
425                                 "size=%d, reserved=%d\n",
426                                 sb->s_id,
427                                 sbi->s_root_block + num_bm,
428                                 blocksize, size, reserved);
429                         root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
430                         if (!root_bh)
431                                 continue;
432                         if (!affs_checksum_block(sb, root_bh) &&
433                             be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
434                             be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
435                                 sbi->s_hashsize    = blocksize / 4 - 56;
436                                 sbi->s_root_block += num_bm;
437                                 goto got_root;
438                         }
439                         affs_brelse(root_bh);
440                         root_bh = NULL;
441                 }
442         }
443         if (!silent)
444                 pr_err("No valid root block on device %s\n", sb->s_id);
445         return -EINVAL;
446
447         /* N.B. after this point bh must be released */
448 got_root:
449         /* Keep super block in cache */
450         sbi->s_root_bh = root_bh;
451         root_block = sbi->s_root_block;
452
453         /* Find out which kind of FS we have */
454         boot_bh = sb_bread(sb, 0);
455         if (!boot_bh) {
456                 pr_err("Cannot read boot block\n");
457                 return -EINVAL;
458         }
459         memcpy(sig, boot_bh->b_data, 4);
460         brelse(boot_bh);
461         chksum = be32_to_cpu(*(__be32 *)sig);
462
463         /* Dircache filesystems are compatible with non-dircache ones
464          * when reading. As long as they aren't supported, writing is
465          * not recommended.
466          */
467         if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
468              || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
469                 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
470                 sb->s_flags |= SB_RDONLY;
471         }
472         switch (chksum) {
473         case MUFS_FS:
474         case MUFS_INTLFFS:
475         case MUFS_DCFFS:
476                 affs_set_opt(sbi->s_flags, SF_MUFS);
477                 fallthrough;
478         case FS_INTLFFS:
479         case FS_DCFFS:
480                 affs_set_opt(sbi->s_flags, SF_INTL);
481                 break;
482         case MUFS_FFS:
483                 affs_set_opt(sbi->s_flags, SF_MUFS);
484                 break;
485         case FS_FFS:
486                 break;
487         case MUFS_OFS:
488                 affs_set_opt(sbi->s_flags, SF_MUFS);
489                 fallthrough;
490         case FS_OFS:
491                 affs_set_opt(sbi->s_flags, SF_OFS);
492                 sb->s_flags |= SB_NOEXEC;
493                 break;
494         case MUFS_DCOFS:
495         case MUFS_INTLOFS:
496                 affs_set_opt(sbi->s_flags, SF_MUFS);
497                 fallthrough;
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                     volume[32];
565         char                    *prefix = NULL;
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                 return -EINVAL;
578         }
579
580         flush_delayed_work(&sbi->sb_work);
581
582         sbi->s_flags = mount_flags;
583         sbi->s_mode  = mode;
584         sbi->s_uid   = uid;
585         sbi->s_gid   = gid;
586         /* protect against readers */
587         spin_lock(&sbi->symlink_lock);
588         if (prefix) {
589                 kfree(sbi->s_prefix);
590                 sbi->s_prefix = prefix;
591         }
592         memcpy(sbi->s_volume, volume, 32);
593         spin_unlock(&sbi->symlink_lock);
594
595         if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
596                 return 0;
597
598         if (*flags & SB_RDONLY)
599                 affs_free_bitmap(sb);
600         else
601                 res = affs_init_bitmap(sb, flags);
602
603         return res;
604 }
605
606 static int
607 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
608 {
609         struct super_block *sb = dentry->d_sb;
610         int              free;
611         u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
612
613         pr_debug("%s() partsize=%d, reserved=%d\n",
614                  __func__, AFFS_SB(sb)->s_partition_size,
615                  AFFS_SB(sb)->s_reserved);
616
617         free          = affs_count_free_blocks(sb);
618         buf->f_type    = AFFS_SUPER_MAGIC;
619         buf->f_bsize   = sb->s_blocksize;
620         buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
621         buf->f_bfree   = free;
622         buf->f_bavail  = free;
623         buf->f_fsid    = u64_to_fsid(id);
624         buf->f_namelen = AFFSNAMEMAX;
625         return 0;
626 }
627
628 static struct dentry *affs_mount(struct file_system_type *fs_type,
629         int flags, const char *dev_name, void *data)
630 {
631         return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
632 }
633
634 static void affs_kill_sb(struct super_block *sb)
635 {
636         struct affs_sb_info *sbi = AFFS_SB(sb);
637         kill_block_super(sb);
638         if (sbi) {
639                 affs_free_bitmap(sb);
640                 affs_brelse(sbi->s_root_bh);
641                 kfree(sbi->s_prefix);
642                 mutex_destroy(&sbi->s_bmlock);
643                 kfree(sbi);
644         }
645 }
646
647 static struct file_system_type affs_fs_type = {
648         .owner          = THIS_MODULE,
649         .name           = "affs",
650         .mount          = affs_mount,
651         .kill_sb        = affs_kill_sb,
652         .fs_flags       = FS_REQUIRES_DEV,
653 };
654 MODULE_ALIAS_FS("affs");
655
656 static int __init init_affs_fs(void)
657 {
658         int err = init_inodecache();
659         if (err)
660                 goto out1;
661         err = register_filesystem(&affs_fs_type);
662         if (err)
663                 goto out;
664         return 0;
665 out:
666         destroy_inodecache();
667 out1:
668         return err;
669 }
670
671 static void __exit exit_affs_fs(void)
672 {
673         unregister_filesystem(&affs_fs_type);
674         destroy_inodecache();
675 }
676
677 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
678 MODULE_LICENSE("GPL");
679
680 module_init(init_affs_fs)
681 module_exit(exit_affs_fs)