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/fs_parser.h>
 18#include <linux/fs_context.h>
 19#include <linux/magic.h>
 20#include <linux/sched.h>
 21#include <linux/cred.h>
 22#include <linux/slab.h>
 23#include <linux/writeback.h>
 24#include <linux/blkdev.h>
 25#include <linux/seq_file.h>
 26#include <linux/iversion.h>
 27#include "affs.h"
 28
 29static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
 30static int affs_show_options(struct seq_file *m, struct dentry *root);
 31
 32static void
 33affs_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
 49static void
 50affs_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
 58static int
 59affs_sync_fs(struct super_block *sb, int wait)
 60{
 61	affs_commit_super(sb, wait);
 62	return 0;
 63}
 64
 65static 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
 80void 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
 97static struct kmem_cache * affs_inode_cachep;
 98
 99static 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
115static void affs_free_inode(struct inode *inode)
116{
117	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118}
119
120static 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
129static 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 | SLAB_ACCOUNT),
134					     init_once);
135	if (affs_inode_cachep == NULL)
136		return -ENOMEM;
137	return 0;
138}
139
140static 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
150static 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	.show_options	= affs_show_options,
159};
160
161enum {
162	Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
163	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
164	Opt_verbose, Opt_volume, Opt_ignore,
165};
166
167struct affs_context {
168	kuid_t		uid;		/* uid to override */
169	kgid_t		gid;		/* gid to override */
170	unsigned int	mode;		/* mode to override */
171	unsigned int	reserved;	/* Number of reserved blocks */
172	int		root_block;	/* FFS root block number */
173	int		blocksize;	/* Initial device blksize */
174	char		*prefix;	/* Prefix for volumes and assigns */
175	char		volume[32];	/* Vol. prefix for absolute symlinks */
176	unsigned long	mount_flags;	/* Options */
177};
178
179static const struct fs_parameter_spec affs_param_spec[] = {
180	fsparam_u32	("bs",		Opt_bs),
181	fsparam_u32oct	("mode",	Opt_mode),
182	fsparam_flag	("mufs",	Opt_mufs),
183	fsparam_flag	("nofilenametruncate",	Opt_notruncate),
184	fsparam_string	("prefix",	Opt_prefix),
185	fsparam_flag	("protect",	Opt_protect),
186	fsparam_u32	("reserved",	Opt_reserved),
187	fsparam_u32	("root",	Opt_root),
188	fsparam_gid	("setgid",	Opt_setgid),
189	fsparam_uid	("setuid",	Opt_setuid),
190	fsparam_flag	("verbose",	Opt_verbose),
191	fsparam_string	("volume",	Opt_volume),
192	fsparam_flag	("grpquota",	Opt_ignore),
193	fsparam_flag	("noquota",	Opt_ignore),
194	fsparam_flag	("quota",	Opt_ignore),
195	fsparam_flag	("usrquota",	Opt_ignore),
196	{},
197};
198
199static int affs_parse_param(struct fs_context *fc, struct fs_parameter *param)
200{
201	struct affs_context *ctx = fc->fs_private;
202	struct fs_parse_result result;
203	int n;
204	int opt;
205
206	opt = fs_parse(fc, affs_param_spec, param, &result);
207	if (opt < 0)
208		return opt;
209
210	switch (opt) {
211	case Opt_bs:
212		n = result.uint_32;
213		if (n != 512 && n != 1024 && n != 2048
214		    && n != 4096) {
215			pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
216			return -EINVAL;
217		}
218		ctx->blocksize = n;
219		break;
220	case Opt_mode:
221		ctx->mode = result.uint_32 & 0777;
222		affs_set_opt(ctx->mount_flags, SF_SETMODE);
223		break;
224	case Opt_mufs:
225		affs_set_opt(ctx->mount_flags, SF_MUFS);
226		break;
227	case Opt_notruncate:
228		affs_set_opt(ctx->mount_flags, SF_NO_TRUNCATE);
229		break;
230	case Opt_prefix:
231		kfree(ctx->prefix);
232		ctx->prefix = param->string;
233		param->string = NULL;
234		affs_set_opt(ctx->mount_flags, SF_PREFIX);
235		break;
236	case Opt_protect:
237		affs_set_opt(ctx->mount_flags, SF_IMMUTABLE);
238		break;
239	case Opt_reserved:
240		ctx->reserved = result.uint_32;
241		break;
242	case Opt_root:
243		ctx->root_block = result.uint_32;
244		break;
245	case Opt_setgid:
246		ctx->gid = result.gid;
247		affs_set_opt(ctx->mount_flags, SF_SETGID);
248		break;
249	case Opt_setuid:
250		ctx->uid = result.uid;
251		affs_set_opt(ctx->mount_flags, SF_SETUID);
252		break;
253	case Opt_verbose:
254		affs_set_opt(ctx->mount_flags, SF_VERBOSE);
255		break;
256	case Opt_volume:
257		strscpy(ctx->volume, param->string, 32);
258		break;
259	case Opt_ignore:
260		/* Silently ignore the quota options */
261		break;
262	default:
263		return -EINVAL;
264	}
265	return 0;
266}
267
268static int affs_show_options(struct seq_file *m, struct dentry *root)
269{
270	struct super_block *sb = root->d_sb;
271	struct affs_sb_info *sbi = AFFS_SB(sb);
272
273	if (sb->s_blocksize)
274		seq_printf(m, ",bs=%lu", sb->s_blocksize);
275	if (affs_test_opt(sbi->s_flags, SF_SETMODE))
276		seq_printf(m, ",mode=%o", sbi->s_mode);
277	if (affs_test_opt(sbi->s_flags, SF_MUFS))
278		seq_puts(m, ",mufs");
279	if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
280		seq_puts(m, ",nofilenametruncate");
281	if (affs_test_opt(sbi->s_flags, SF_PREFIX))
282		seq_printf(m, ",prefix=%s", sbi->s_prefix);
283	if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
284		seq_puts(m, ",protect");
285	if (sbi->s_reserved != 2)
286		seq_printf(m, ",reserved=%u", sbi->s_reserved);
287	if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
288		seq_printf(m, ",root=%u", sbi->s_root_block);
289	if (affs_test_opt(sbi->s_flags, SF_SETGID))
290		seq_printf(m, ",setgid=%u",
291			   from_kgid_munged(&init_user_ns, sbi->s_gid));
292	if (affs_test_opt(sbi->s_flags, SF_SETUID))
293		seq_printf(m, ",setuid=%u",
294			   from_kuid_munged(&init_user_ns, sbi->s_uid));
295	if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
296		seq_puts(m, ",verbose");
297	if (sbi->s_volume[0])
298		seq_printf(m, ",volume=%s", sbi->s_volume);
299	return 0;
300}
301
302/* This function definitely needs to be split up. Some fine day I'll
303 * hopefully have the guts to do so. Until then: sorry for the mess.
304 */
305
306static int affs_fill_super(struct super_block *sb, struct fs_context *fc)
307{
308	struct affs_sb_info	*sbi;
309	struct affs_context	*ctx = fc->fs_private;
310	struct buffer_head	*root_bh = NULL;
311	struct buffer_head	*boot_bh;
312	struct inode		*root_inode = NULL;
313	int			 silent = fc->sb_flags & SB_SILENT;
314	int			 size, blocksize;
315	u32			 chksum;
316	int			 num_bm;
317	int			 i, j;
318	int			 tmp_flags;	/* fix remount prototype... */
319	u8			 sig[4];
320	int			 ret;
321
322	sb->s_magic             = AFFS_SUPER_MAGIC;
323	sb->s_op                = &affs_sops;
324	sb->s_flags |= SB_NODIRATIME;
325
326	sb->s_time_gran = NSEC_PER_SEC;
327	sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
328	sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
329
330	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
331	if (!sbi)
332		return -ENOMEM;
333
334	sb->s_fs_info = sbi;
335	sbi->sb = sb;
336	mutex_init(&sbi->s_bmlock);
337	spin_lock_init(&sbi->symlink_lock);
338	spin_lock_init(&sbi->work_lock);
339	INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
340
341	sbi->s_flags	= ctx->mount_flags;
342	sbi->s_mode	= ctx->mode;
343	sbi->s_uid	= ctx->uid;
344	sbi->s_gid	= ctx->gid;
345	sbi->s_reserved	= ctx->reserved;
346	sbi->s_prefix	= ctx->prefix;
347	ctx->prefix	= NULL;
348	memcpy(sbi->s_volume, ctx->volume, 32);
349
350	/* N.B. after this point s_prefix must be released */
351
352	/* Get the size of the device in 512-byte blocks.
353	 * If we later see that the partition uses bigger
354	 * blocks, we will have to change it.
355	 */
356
357	size = bdev_nr_sectors(sb->s_bdev);
358	pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
359
360	affs_set_blocksize(sb, PAGE_SIZE);
361	/* Try to find root block. Its location depends on the block size. */
362
363	i = bdev_logical_block_size(sb->s_bdev);
364	j = PAGE_SIZE;
365	blocksize = ctx->blocksize;
366	if (blocksize > 0) {
367		i = j = blocksize;
368		size = size / (blocksize / 512);
369	}
370
371	for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
372		sbi->s_root_block = ctx->root_block;
373		if (ctx->root_block < 0)
374			sbi->s_root_block = (ctx->reserved + size - 1) / 2;
375		pr_debug("setting blocksize to %d\n", blocksize);
376		affs_set_blocksize(sb, blocksize);
377		sbi->s_partition_size = size;
378
379		/* The root block location that was calculated above is not
380		 * correct if the partition size is an odd number of 512-
381		 * byte blocks, which will be rounded down to a number of
382		 * 1024-byte blocks, and if there were an even number of
383		 * reserved blocks. Ideally, all partition checkers should
384		 * report the real number of blocks of the real blocksize,
385		 * but since this just cannot be done, we have to try to
386		 * find the root block anyways. In the above case, it is one
387		 * block behind the calculated one. So we check this one, too.
388		 */
389		for (num_bm = 0; num_bm < 2; num_bm++) {
390			pr_debug("Dev %s, trying root=%u, bs=%d, "
391				"size=%d, reserved=%d\n",
392				sb->s_id,
393				sbi->s_root_block + num_bm,
394				ctx->blocksize, size, ctx->reserved);
395			root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
396			if (!root_bh)
397				continue;
398			if (!affs_checksum_block(sb, root_bh) &&
399			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
400			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
401				sbi->s_hashsize    = blocksize / 4 - 56;
402				sbi->s_root_block += num_bm;
403				goto got_root;
404			}
405			affs_brelse(root_bh);
406			root_bh = NULL;
407		}
408	}
409	if (!silent)
410		pr_err("No valid root block on device %s\n", sb->s_id);
411	return -EINVAL;
412
413	/* N.B. after this point bh must be released */
414got_root:
415	/* Keep super block in cache */
416	sbi->s_root_bh = root_bh;
417	ctx->root_block = sbi->s_root_block;
418
419	/* Find out which kind of FS we have */
420	boot_bh = sb_bread(sb, 0);
421	if (!boot_bh) {
422		pr_err("Cannot read boot block\n");
423		return -EINVAL;
424	}
425	memcpy(sig, boot_bh->b_data, 4);
426	brelse(boot_bh);
427	chksum = be32_to_cpu(*(__be32 *)sig);
428
429	/* Dircache filesystems are compatible with non-dircache ones
430	 * when reading. As long as they aren't supported, writing is
431	 * not recommended.
432	 */
433	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
434	     || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
435		pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
436		sb->s_flags |= SB_RDONLY;
437	}
438	switch (chksum) {
439	case MUFS_FS:
440	case MUFS_INTLFFS:
441	case MUFS_DCFFS:
442		affs_set_opt(sbi->s_flags, SF_MUFS);
443		fallthrough;
444	case FS_INTLFFS:
445	case FS_DCFFS:
446		affs_set_opt(sbi->s_flags, SF_INTL);
447		break;
448	case MUFS_FFS:
449		affs_set_opt(sbi->s_flags, SF_MUFS);
450		break;
451	case FS_FFS:
452		break;
453	case MUFS_OFS:
454		affs_set_opt(sbi->s_flags, SF_MUFS);
455		fallthrough;
456	case FS_OFS:
457		affs_set_opt(sbi->s_flags, SF_OFS);
458		sb->s_flags |= SB_NOEXEC;
459		break;
460	case MUFS_DCOFS:
461	case MUFS_INTLOFS:
462		affs_set_opt(sbi->s_flags, SF_MUFS);
463		fallthrough;
464	case FS_DCOFS:
465	case FS_INTLOFS:
466		affs_set_opt(sbi->s_flags, SF_INTL);
467		affs_set_opt(sbi->s_flags, SF_OFS);
468		sb->s_flags |= SB_NOEXEC;
469		break;
470	default:
471		pr_err("Unknown filesystem on device %s: %08X\n",
472		       sb->s_id, chksum);
473		return -EINVAL;
474	}
475
476	if (affs_test_opt(ctx->mount_flags, SF_VERBOSE)) {
477		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
478		pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
479			len > 31 ? 31 : len,
480			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
481			sig, sig[3] + '0', blocksize);
482	}
483
484	sb->s_flags |= SB_NODEV | SB_NOSUID;
485
486	sbi->s_data_blksize = sb->s_blocksize;
487	if (affs_test_opt(sbi->s_flags, SF_OFS))
488		sbi->s_data_blksize -= 24;
489
490	tmp_flags = sb->s_flags;
491	ret = affs_init_bitmap(sb, &tmp_flags);
492	if (ret)
493		return ret;
494	sb->s_flags = tmp_flags;
495
496	/* set up enough so that it can read an inode */
497
498	root_inode = affs_iget(sb, ctx->root_block);
499	if (IS_ERR(root_inode))
500		return PTR_ERR(root_inode);
501
502	if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
503		set_default_d_op(sb, &affs_intl_dentry_operations);
504	else
505		set_default_d_op(sb, &affs_dentry_operations);
506
507	sb->s_root = d_make_root(root_inode);
508	if (!sb->s_root) {
509		pr_err("AFFS: Get root inode failed\n");
510		return -ENOMEM;
511	}
512
513	sb->s_export_op = &affs_export_ops;
514	pr_debug("s_flags=%lX\n", sb->s_flags);
515	return 0;
516}
517
518static int affs_reconfigure(struct fs_context *fc)
519{
520	struct super_block	*sb = fc->root->d_sb;
521	struct affs_context	*ctx = fc->fs_private;
522	struct affs_sb_info	*sbi = AFFS_SB(sb);
523	int			 res = 0;
524
525	sync_filesystem(sb);
526	fc->sb_flags |= SB_NODIRATIME;
527
528	flush_delayed_work(&sbi->sb_work);
529
530	/*
531	 * NB: Historically, only mount_flags, mode, uid, gic, prefix,
532	 * and volume are accepted during remount.
533	 */
534	sbi->s_flags = ctx->mount_flags;
535	sbi->s_mode  = ctx->mode;
536	sbi->s_uid   = ctx->uid;
537	sbi->s_gid   = ctx->gid;
538	/* protect against readers */
539	spin_lock(&sbi->symlink_lock);
540	if (ctx->prefix) {
541		kfree(sbi->s_prefix);
542		sbi->s_prefix = ctx->prefix;
543		ctx->prefix = NULL;
544	}
545	memcpy(sbi->s_volume, ctx->volume, 32);
546	spin_unlock(&sbi->symlink_lock);
547
548	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb))
549		return 0;
550
551	if (fc->sb_flags & SB_RDONLY)
552		affs_free_bitmap(sb);
553	else
554		res = affs_init_bitmap(sb, &fc->sb_flags);
555
556	return res;
557}
558
559static int
560affs_statfs(struct dentry *dentry, struct kstatfs *buf)
561{
562	struct super_block *sb = dentry->d_sb;
563	int		 free;
564	u64		 id = huge_encode_dev(sb->s_bdev->bd_dev);
565
566	pr_debug("%s() partsize=%d, reserved=%d\n",
567		 __func__, AFFS_SB(sb)->s_partition_size,
568		 AFFS_SB(sb)->s_reserved);
569
570	free          = affs_count_free_blocks(sb);
571	buf->f_type    = AFFS_SUPER_MAGIC;
572	buf->f_bsize   = sb->s_blocksize;
573	buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
574	buf->f_bfree   = free;
575	buf->f_bavail  = free;
576	buf->f_fsid    = u64_to_fsid(id);
577	buf->f_namelen = AFFSNAMEMAX;
578	return 0;
579}
580
581static int affs_get_tree(struct fs_context *fc)
582{
583	return get_tree_bdev(fc, affs_fill_super);
584}
585
586static void affs_kill_sb(struct super_block *sb)
587{
588	struct affs_sb_info *sbi = AFFS_SB(sb);
589	kill_block_super(sb);
590	if (sbi) {
591		affs_free_bitmap(sb);
592		affs_brelse(sbi->s_root_bh);
593		kfree(sbi->s_prefix);
594		mutex_destroy(&sbi->s_bmlock);
595		kfree_rcu(sbi, rcu);
596	}
597}
598
599static void affs_free_fc(struct fs_context *fc)
600{
601	struct affs_context *ctx = fc->fs_private;
602
603	kfree(ctx->prefix);
604	kfree(ctx);
605}
606
607static const struct fs_context_operations affs_context_ops = {
608	.parse_param	= affs_parse_param,
609	.get_tree	= affs_get_tree,
610	.reconfigure	= affs_reconfigure,
611	.free		= affs_free_fc,
612};
613
614static int affs_init_fs_context(struct fs_context *fc)
615{
616	struct affs_context *ctx;
617
618	ctx = kzalloc(sizeof(struct affs_context), GFP_KERNEL);
619	if (!ctx)
620		return -ENOMEM;
621
622	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
623		struct super_block *sb = fc->root->d_sb;
624		struct affs_sb_info *sbi = AFFS_SB(sb);
625
626		/*
627		 * NB: historically, no options other than volume were
628		 * preserved across a remount unless they were explicitly
629		 * passed in.
630		 */
631		memcpy(ctx->volume, sbi->s_volume, 32);
632	} else {
633		ctx->uid	= current_uid();
634		ctx->gid	= current_gid();
635		ctx->reserved	= 2;
636		ctx->root_block	= -1;
637		ctx->blocksize	= -1;
638		ctx->volume[0]	= ':';
639	}
640
641	fc->ops = &affs_context_ops;
642	fc->fs_private = ctx;
643
644	return 0;
645}
646
647static struct file_system_type affs_fs_type = {
648	.owner		= THIS_MODULE,
649	.name		= "affs",
650	.kill_sb	= affs_kill_sb,
651	.fs_flags	= FS_REQUIRES_DEV,
652	.init_fs_context = affs_init_fs_context,
653	.parameters	= affs_param_spec,
654};
655MODULE_ALIAS_FS("affs");
656
657static int __init init_affs_fs(void)
658{
659	int err = init_inodecache();
660	if (err)
661		goto out1;
662	err = register_filesystem(&affs_fs_type);
663	if (err)
664		goto out;
665	return 0;
666out:
667	destroy_inodecache();
668out1:
669	return err;
670}
671
672static void __exit exit_affs_fs(void)
673{
674	unregister_filesystem(&affs_fs_type);
675	destroy_inodecache();
676}
677
678MODULE_DESCRIPTION("Amiga filesystem support for Linux");
679MODULE_LICENSE("GPL");
680
681module_init(init_affs_fs)
682module_exit(exit_affs_fs)