[deliverable/linux.git] / fs / affs / super.c

/*
 *  linux/fs/affs/inode.c
 *
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
 *
 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
 *
 *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/statfs.h>
#include <linux/parser.h>
#include <linux/magic.h>
#include "affs.h"

extern struct timezone sys_tz;

static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int affs_remount (struct super_block *sb, int *flags, char *data);

static void
affs_put_super(struct super_block *sb)
{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	pr_debug("AFFS: put_super()\n");

	if (!(sb->s_flags & MS_RDONLY)) {
		AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
		secs_to_datestamp(get_seconds(),
				  &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
		affs_fix_checksum(sb, sbi->s_root_bh);
		mark_buffer_dirty(sbi->s_root_bh);
	}

	kfree(sbi->s_prefix);
	affs_free_bitmap(sb);
	affs_brelse(sbi->s_root_bh);
	kfree(sbi);
	sb->s_fs_info = NULL;
	return;
}

static void
affs_write_super(struct super_block *sb)
{
	int clean = 2;
	struct affs_sb_info *sbi = AFFS_SB(sb);

	if (!(sb->s_flags & MS_RDONLY)) {
		//	if (sbi->s_bitmap[i].bm_bh) {
		//		if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
		//			clean = 0;
		AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
		secs_to_datestamp(get_seconds(),
				  &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
		affs_fix_checksum(sb, sbi->s_root_bh);
		mark_buffer_dirty(sbi->s_root_bh);
		sb->s_dirt = !clean;	/* redo until bitmap synced */
	} else
		sb->s_dirt = 0;

	pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
}

static kmem_cache_t * affs_inode_cachep;

static struct inode *affs_alloc_inode(struct super_block *sb)
{
	struct affs_inode_info *ei;
	ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
	if (!ei)
		return NULL;
	ei->vfs_inode.i_version = 1;
	return &ei->vfs_inode;
}

static void affs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
}

static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct affs_inode_info *ei = (struct affs_inode_info *) foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		init_MUTEX(&ei->i_link_lock);
		init_MUTEX(&ei->i_ext_lock);
		inode_init_once(&ei->vfs_inode);
	}
}

static int init_inodecache(void)
{
	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
					     sizeof(struct affs_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once, NULL);
	if (affs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	if (kmem_cache_destroy(affs_inode_cachep))
		printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
}

static struct super_operations affs_sops = {
	.alloc_inode	= affs_alloc_inode,
	.destroy_inode	= affs_destroy_inode,
	.read_inode	= affs_read_inode,
	.write_inode	= affs_write_inode,
	.put_inode	= affs_put_inode,
	.delete_inode	= affs_delete_inode,
	.clear_inode	= affs_clear_inode,
	.put_super	= affs_put_super,
	.write_super	= affs_write_super,
	.statfs		= affs_statfs,
	.remount_fs	= affs_remount,
};

enum {
	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
};

static match_table_t tokens = {
	{Opt_bs, "bs=%u"},
	{Opt_mode, "mode=%o"},
	{Opt_mufs, "mufs"},
	{Opt_prefix, "prefix=%s"},
	{Opt_protect, "protect"},
	{Opt_reserved, "reserved=%u"},
	{Opt_root, "root=%u"},
	{Opt_setgid, "setgid=%u"},
	{Opt_setuid, "setuid=%u"},
	{Opt_verbose, "verbose"},
	{Opt_volume, "volume=%s"},
	{Opt_ignore, "grpquota"},
	{Opt_ignore, "noquota"},
	{Opt_ignore, "quota"},
	{Opt_ignore, "usrquota"},
	{Opt_err, NULL},
};

static int
parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
		int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];

	/* Fill in defaults */

	*uid        = current->uid;
	*gid        = current->gid;
	*reserved   = 2;
	*root       = -1;
	*blocksize  = -1;
	volume[0]   = ':';
	volume[1]   = 0;
	*mount_opts = 0;
	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		int token, n, option;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_bs:
			if (match_int(&args[0], &n))
				return -EINVAL;
			if (n != 512 && n != 1024 && n != 2048
			    && n != 4096) {
				printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
				return 0;
			}
			*blocksize = n;
			break;
		case Opt_mode:
			if (match_octal(&args[0], &option))
				return 1;
			*mode = option & 0777;
			*mount_opts |= SF_SETMODE;
			break;
		case Opt_mufs:
			*mount_opts |= SF_MUFS;
			break;
		case Opt_prefix:
			/* Free any previous prefix */
			kfree(*prefix);
			*prefix = NULL;
			*prefix = match_strdup(&args[0]);
			if (!*prefix)
				return 0;
			*mount_opts |= SF_PREFIX;
			break;
		case Opt_protect:
			*mount_opts |= SF_IMMUTABLE;
			break;
		case Opt_reserved:
			if (match_int(&args[0], reserved))
				return 1;
			break;
		case Opt_root:
			if (match_int(&args[0], root))
				return 1;
			break;
		case Opt_setgid:
			if (match_int(&args[0], &option))
				return 1;
			*gid = option;
			*mount_opts |= SF_SETGID;
			break;
		case Opt_setuid:
			if (match_int(&args[0], &option))
				return -EINVAL;
			*uid = option;
			*mount_opts |= SF_SETUID;
			break;
		case Opt_verbose:
			*mount_opts |= SF_VERBOSE;
			break;
		case Opt_volume: {
			char *vol = match_strdup(&args[0]);
			strlcpy(volume, vol, 32);
			kfree(vol);
			break;
		}
		case Opt_ignore:
		 	/* Silently ignore the quota options */
			break;
		default:
			printk("AFFS: Unrecognized mount option \"%s\" "
					"or missing value\n", p);
			return 0;
		}
	}
	return 1;
}

/* This function definitely needs to be split up. Some fine day I'll
 * hopefully have the guts to do so. Until then: sorry for the mess.
 */

static int affs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct affs_sb_info	*sbi;
	struct buffer_head	*root_bh = NULL;
	struct buffer_head	*boot_bh;
	struct inode		*root_inode = NULL;
	s32			 root_block;
	int			 size, blocksize;
	u32			 chksum;
	int			 num_bm;
	int			 i, j;
	s32			 key;
	uid_t			 uid;
	gid_t			 gid;
	int			 reserved;
	unsigned long		 mount_flags;
	int			 tmp_flags;	/* fix remount prototype... */
	u8			 sig[4];

	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");

	sb->s_magic             = AFFS_SUPER_MAGIC;
	sb->s_op                = &affs_sops;
	sb->s_flags |= MS_NODIRATIME;

	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	init_MUTEX(&sbi->s_bmlock);

	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
				&blocksize,&sbi->s_prefix,
				sbi->s_volume, &mount_flags)) {
		printk(KERN_ERR "AFFS: Error parsing options\n");
		return -EINVAL;
	}
	/* N.B. after this point s_prefix must be released */

	sbi->s_flags   = mount_flags;
	sbi->s_mode    = i;
	sbi->s_uid     = uid;
	sbi->s_gid     = gid;
	sbi->s_reserved= reserved;

	/* Get the size of the device in 512-byte blocks.
	 * If we later see that the partition uses bigger
	 * blocks, we will have to change it.
	 */

	size = sb->s_bdev->bd_inode->i_size >> 9;
	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);

	affs_set_blocksize(sb, PAGE_SIZE);
	/* Try to find root block. Its location depends on the block size. */

	i = 512;
	j = 4096;
	if (blocksize > 0) {
		i = j = blocksize;
		size = size / (blocksize / 512);
	}
	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
		sbi->s_root_block = root_block;
		if (root_block < 0)
			sbi->s_root_block = (reserved + size - 1) / 2;
		pr_debug("AFFS: setting blocksize to %d\n", blocksize);
		affs_set_blocksize(sb, blocksize);
		sbi->s_partition_size = size;

		/* The root block location that was calculated above is not
		 * correct if the partition size is an odd number of 512-
		 * byte blocks, which will be rounded down to a number of
		 * 1024-byte blocks, and if there were an even number of
		 * reserved blocks. Ideally, all partition checkers should
		 * report the real number of blocks of the real blocksize,
		 * but since this just cannot be done, we have to try to
		 * find the root block anyways. In the above case, it is one
		 * block behind the calculated one. So we check this one, too.
		 */
		for (num_bm = 0; num_bm < 2; num_bm++) {
			pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
				"size=%d, reserved=%d\n",
				sb->s_id,
				sbi->s_root_block + num_bm,
				blocksize, size, reserved);
			root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
			if (!root_bh)
				continue;
			if (!affs_checksum_block(sb, root_bh) &&
			    be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
			    be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
				sbi->s_hashsize    = blocksize / 4 - 56;
				sbi->s_root_block += num_bm;
				key                        = 1;
				goto got_root;
			}
			affs_brelse(root_bh);
			root_bh = NULL;
		}
	}
	if (!silent)
		printk(KERN_ERR "AFFS: No valid root block on device %s\n",
			sb->s_id);
	goto out_error;

	/* N.B. after this point bh must be released */
got_root:
	root_block = sbi->s_root_block;

	/* Find out which kind of FS we have */
	boot_bh = sb_bread(sb, 0);
	if (!boot_bh) {
		printk(KERN_ERR "AFFS: Cannot read boot block\n");
		goto out_error;
	}
	memcpy(sig, boot_bh->b_data, 4);
	brelse(boot_bh);
	chksum = be32_to_cpu(*(__be32 *)sig);

	/* Dircache filesystems are compatible with non-dircache ones
	 * when reading. As long as they aren't supported, writing is
	 * not recommended.
	 */
	if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
	     || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
		printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
			sb->s_id);
		sb->s_flags |= MS_RDONLY;
	}
	switch (chksum) {
		case MUFS_FS:
		case MUFS_INTLFFS:
		case MUFS_DCFFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_INTLFFS:
		case FS_DCFFS:
			sbi->s_flags |= SF_INTL;
			break;
		case MUFS_FFS:
			sbi->s_flags |= SF_MUFS;
			break;
		case FS_FFS:
			break;
		case MUFS_OFS:
			sbi->s_flags |= SF_MUFS;
			/* fall thru */
		case FS_OFS:
			sbi->s_flags |= SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		case MUFS_DCOFS:
		case MUFS_INTLOFS:
			sbi->s_flags |= SF_MUFS;
		case FS_DCOFS:
		case FS_INTLOFS:
			sbi->s_flags |= SF_INTL | SF_OFS;
			sb->s_flags |= MS_NOEXEC;
			break;
		default:
			printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
				sb->s_id, chksum);
			goto out_error;
	}

	if (mount_flags & SF_VERBOSE) {
		u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
		printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
			len > 31 ? 31 : len,
			AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
			sig, sig[3] + '0', blocksize);
	}

	sb->s_flags |= MS_NODEV | MS_NOSUID;

	sbi->s_data_blksize = sb->s_blocksize;
	if (sbi->s_flags & SF_OFS)
		sbi->s_data_blksize -= 24;

	/* Keep super block in cache */
	sbi->s_root_bh = root_bh;
	/* N.B. after this point s_root_bh must be released */

	tmp_flags = sb->s_flags;
	if (affs_init_bitmap(sb, &tmp_flags))
		goto out_error;
	sb->s_flags = tmp_flags;

	/* set up enough so that it can read an inode */

	root_inode = iget(sb, root_block);
	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root) {
		printk(KERN_ERR "AFFS: Get root inode failed\n");
		goto out_error;
	}
	sb->s_root->d_op = &affs_dentry_operations;

	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	return 0;

	/*
	 * Begin the cascaded cleanup ...
	 */
out_error:
	if (root_inode)
		iput(root_inode);
	kfree(sbi->s_bitmap);
	affs_brelse(root_bh);
	kfree(sbi->s_prefix);
	kfree(sbi);
	sb->s_fs_info = NULL;
	return -EINVAL;
}

static int
affs_remount(struct super_block *sb, int *flags, char *data)
{
	struct affs_sb_info	*sbi = AFFS_SB(sb);
	int			 blocksize;
	uid_t			 uid;
	gid_t			 gid;
	int			 mode;
	int			 reserved;
	int			 root_block;
	unsigned long		 mount_flags;
	int			 res = 0;

	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);

	*flags |= MS_NODIRATIME;

	if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
	    &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
		return -EINVAL;
	sbi->s_flags = mount_flags;
	sbi->s_mode  = mode;
	sbi->s_uid   = uid;
	sbi->s_gid   = gid;

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;
	if (*flags & MS_RDONLY) {
		sb->s_dirt = 1;
		while (sb->s_dirt)
			affs_write_super(sb);
		affs_free_bitmap(sb);
	} else
		res = affs_init_bitmap(sb, flags);

	return res;
}

static int
affs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	int		 free;

	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	     AFFS_SB(sb)->s_reserved);

	free          = affs_count_free_blocks(sb);
	buf->f_type    = AFFS_SUPER_MAGIC;
	buf->f_bsize   = sb->s_blocksize;
	buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	buf->f_bfree   = free;
	buf->f_bavail  = free;
	return 0;
}

static int affs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
			   mnt);
}

static struct file_system_type affs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "affs",
	.get_sb		= affs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_affs_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&affs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_affs_fs(void)
{
	unregister_filesystem(&affs_fs_type);
	destroy_inodecache();
}

MODULE_DESCRIPTION("Amiga filesystem support for Linux");
MODULE_LICENSE("GPL");

module_init(init_affs_fs)
module_exit(exit_affs_fs)
Commit	Line	Data
1da177e4 LT	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>
e18fa700	17	#include <linux/magic.h>
1da177e4 LT	18	#include "affs.h"
	19
	20	extern struct timezone sys_tz;
	21
726c3342	22	static int affs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	23	static int affs_remount (struct super_block sb, int flags, char *data);
	24
	25	static void
	26	affs_put_super(struct super_block *sb)
	27	{
	28	struct affs_sb_info *sbi = AFFS_SB(sb);
	29	pr_debug("AFFS: put_super()\n");
	30
	31	if (!(sb->s_flags & MS_RDONLY)) {
	32	AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
	33	secs_to_datestamp(get_seconds(),
	34	&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
	35	affs_fix_checksum(sb, sbi->s_root_bh);
	36	mark_buffer_dirty(sbi->s_root_bh);
	37	}
	38
f99d49ad	39	kfree(sbi->s_prefix);
1da177e4 LT	40	affs_free_bitmap(sb);
	41	affs_brelse(sbi->s_root_bh);
	42	kfree(sbi);
	43	sb->s_fs_info = NULL;
	44	return;
	45	}
	46
	47	static void
	48	affs_write_super(struct super_block *sb)
	49	{
	50	int clean = 2;
	51	struct affs_sb_info *sbi = AFFS_SB(sb);
	52
	53	if (!(sb->s_flags & MS_RDONLY)) {
	54	// if (sbi->s_bitmap[i].bm_bh) {
	55	// if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
	56	// clean = 0;
	57	AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
	58	secs_to_datestamp(get_seconds(),
	59	&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
	60	affs_fix_checksum(sb, sbi->s_root_bh);
	61	mark_buffer_dirty(sbi->s_root_bh);
	62	sb->s_dirt = !clean; /* redo until bitmap synced */
	63	} else
	64	sb->s_dirt = 0;
	65
	66	pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
	67	}
	68
	69	static kmem_cache_t * affs_inode_cachep;
	70
	71	static struct inode affs_alloc_inode(struct super_block sb)
	72	{
	73	struct affs_inode_info *ei;
	74	ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
	75	if (!ei)
	76	return NULL;
	77	ei->vfs_inode.i_version = 1;
	78	return &ei->vfs_inode;
	79	}
	80
	81	static void affs_destroy_inode(struct inode *inode)
	82	{
	83	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	84	}
	85
	86	static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
	87	{
	88	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	89
	90	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	91	SLAB_CTOR_CONSTRUCTOR) {
	92	init_MUTEX(&ei->i_link_lock);
	93	init_MUTEX(&ei->i_ext_lock);
	94	inode_init_once(&ei->vfs_inode);
	95	}
	96	}
	97
	98	static int init_inodecache(void)
	99	{
	100	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	101	sizeof(struct affs_inode_info),
fffb60f9 PJ	102	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	103	SLAB_MEM_SPREAD),
1da177e4 LT	104	init_once, NULL);
	105	if (affs_inode_cachep == NULL)
	106	return -ENOMEM;
	107	return 0;
	108	}
	109
	110	static void destroy_inodecache(void)
	111	{
	112	if (kmem_cache_destroy(affs_inode_cachep))
	113	printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
	114	}
	115
	116	static struct super_operations affs_sops = {
	117	.alloc_inode = affs_alloc_inode,
	118	.destroy_inode = affs_destroy_inode,
	119	.read_inode = affs_read_inode,
	120	.write_inode = affs_write_inode,
	121	.put_inode = affs_put_inode,
	122	.delete_inode = affs_delete_inode,
	123	.clear_inode = affs_clear_inode,
	124	.put_super = affs_put_super,
	125	.write_super = affs_write_super,
	126	.statfs = affs_statfs,
	127	.remount_fs = affs_remount,
	128	};
	129
	130	enum {
	131	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	132	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	133	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	134	};
	135
	136	static match_table_t tokens = {
	137	{Opt_bs, "bs=%u"},
	138	{Opt_mode, "mode=%o"},
	139	{Opt_mufs, "mufs"},
	140	{Opt_prefix, "prefix=%s"},
	141	{Opt_protect, "protect"},
	142	{Opt_reserved, "reserved=%u"},
	143	{Opt_root, "root=%u"},
	144	{Opt_setgid, "setgid=%u"},
	145	{Opt_setuid, "setuid=%u"},
	146	{Opt_verbose, "verbose"},
	147	{Opt_volume, "volume=%s"},
	148	{Opt_ignore, "grpquota"},
	149	{Opt_ignore, "noquota"},
	150	{Opt_ignore, "quota"},
	151	{Opt_ignore, "usrquota"},
	152	{Opt_err, NULL},
	153	};
	154
	155	static int
	156	parse_options(char options, uid_t uid, gid_t gid, int mode, int reserved, s32 root,
	157	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	158	{
	159	char *p;
	160	substring_t args[MAX_OPT_ARGS];
	161
	162	/* Fill in defaults */
	163
	164	*uid = current->uid;
	165	*gid = current->gid;
	166	*reserved = 2;
	167	*root = -1;
168	*blocksize = -1;
169	volume[0] = ':';
170	volume[1] = 0;
171	*mount_opts = 0;
172	if (!options)
173	return 1;
174
175	while ((p = strsep(&options, ",")) != NULL) {
176	int token, n, option;
177	if (!*p)
178	continue;
179
180	token = match_token(p, tokens, args);
181	switch (token) {
182	case Opt_bs:
183	if (match_int(&args[0], &n))
184	return -EINVAL;
185	if (n != 512 && n != 1024 && n != 2048
186	&& n != 4096) {
187	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
188	return 0;
189	}
190	*blocksize = n;
191	break;
192	case Opt_mode:
193	if (match_octal(&args[0], &option))
194	return 1;
195	*mode = option & 0777;
196	*mount_opts \|= SF_SETMODE;
197	break;
198	case Opt_mufs:
199	*mount_opts \|= SF_MUFS;
200	break;
201	case Opt_prefix:
f99d49ad JJ	202	/* Free any previous prefix */
	203	kfree(*prefix);
	204	*prefix = NULL;
1da177e4 LT	205	*prefix = match_strdup(&args[0]);
	206	if (!*prefix)
	207	return 0;
	208	*mount_opts \|= SF_PREFIX;
	209	break;
	210	case Opt_protect:
	211	*mount_opts \|= SF_IMMUTABLE;
	212	break;
	213	case Opt_reserved:
	214	if (match_int(&args[0], reserved))
	215	return 1;
	216	break;
	217	case Opt_root:
	218	if (match_int(&args[0], root))
	219	return 1;
	220	break;
	221	case Opt_setgid:
	222	if (match_int(&args[0], &option))
	223	return 1;
	224	*gid = option;
	225	*mount_opts \|= SF_SETGID;
	226	break;
	227	case Opt_setuid:
	228	if (match_int(&args[0], &option))
	229	return -EINVAL;
	230	*uid = option;
	231	*mount_opts \|= SF_SETUID;
	232	break;
	233	case Opt_verbose:
	234	*mount_opts \|= SF_VERBOSE;
	235	break;
	236	case Opt_volume: {
	237	char *vol = match_strdup(&args[0]);
	238	strlcpy(volume, vol, 32);
	239	kfree(vol);
	240	break;
	241	}
	242	case Opt_ignore:
	243	/* Silently ignore the quota options */
	244	break;
	245	default:
	246	printk("AFFS: Unrecognized mount option \"%s\" "
	247	"or missing value\n", p);
	248	return 0;
	249	}
	250	}
	251	return 1;
	252	}
	253
	254	/* This function definitely needs to be split up. Some fine day I'll
	255	* hopefully have the guts to do so. Until then: sorry for the mess.
	256	*/
	257
	258	static int affs_fill_super(struct super_block sb, void data, int silent)
	259	{
	260	struct affs_sb_info *sbi;
	261	struct buffer_head *root_bh = NULL;
	262	struct buffer_head *boot_bh;
	263	struct inode *root_inode = NULL;
	264	s32 root_block;
	265	int size, blocksize;
	266	u32 chksum;
	267	int num_bm;
	268	int i, j;
269	s32 key;
270	uid_t uid;
271	gid_t gid;
272	int reserved;
273	unsigned long mount_flags;
274	int tmp_flags; /* fix remount prototype... */
2b943cf0	275	u8 sig[4];
1da177e4 LT	276
	277	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	278
	279	sb->s_magic = AFFS_SUPER_MAGIC;
	280	sb->s_op = &affs_sops;
	281	sb->s_flags \|= MS_NODIRATIME;
	282
f8314dc6	283	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	284	if (!sbi)
	285	return -ENOMEM;
	286	sb->s_fs_info = sbi;
1da177e4 LT	287	init_MUTEX(&sbi->s_bmlock);
	288
	289	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	290	&blocksize,&sbi->s_prefix,
	291	sbi->s_volume, &mount_flags)) {
	292	printk(KERN_ERR "AFFS: Error parsing options\n");
	293	return -EINVAL;
	294	}
	295	/* N.B. after this point s_prefix must be released */
	296
	297	sbi->s_flags = mount_flags;
	298	sbi->s_mode = i;
	299	sbi->s_uid = uid;
	300	sbi->s_gid = gid;
	301	sbi->s_reserved= reserved;
	302
	303	/* Get the size of the device in 512-byte blocks.
	304	* If we later see that the partition uses bigger
	305	* blocks, we will have to change it.
	306	*/
	307
	308	size = sb->s_bdev->bd_inode->i_size >> 9;
	309	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	310
	311	affs_set_blocksize(sb, PAGE_SIZE);
	312	/* Try to find root block. Its location depends on the block size. */
	313
	314	i = 512;
	315	j = 4096;
	316	if (blocksize > 0) {
	317	i = j = blocksize;
	318	size = size / (blocksize / 512);
	319	}
	320	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	321	sbi->s_root_block = root_block;
	322	if (root_block < 0)
	323	sbi->s_root_block = (reserved + size - 1) / 2;
	324	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	325	affs_set_blocksize(sb, blocksize);
	326	sbi->s_partition_size = size;
	327
	328	/* The root block location that was calculated above is not
	329	* correct if the partition size is an odd number of 512-
	330	* byte blocks, which will be rounded down to a number of
	331	* 1024-byte blocks, and if there were an even number of
	332	* reserved blocks. Ideally, all partition checkers should
	333	* report the real number of blocks of the real blocksize,
	334	* but since this just cannot be done, we have to try to
	335	* find the root block anyways. In the above case, it is one
	336	* block behind the calculated one. So we check this one, too.
	337	*/
	338	for (num_bm = 0; num_bm < 2; num_bm++) {
	339	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	340	"size=%d, reserved=%d\n",
	341	sb->s_id,
	342	sbi->s_root_block + num_bm,
	343	blocksize, size, reserved);
	344	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	345	if (!root_bh)
	346	continue;
	347	if (!affs_checksum_block(sb, root_bh) &&
	348	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	349	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	350	sbi->s_hashsize = blocksize / 4 - 56;
351	sbi->s_root_block += num_bm;
352	key = 1;
353	goto got_root;
354	}
355	affs_brelse(root_bh);
356	root_bh = NULL;
357	}
358	}
359	if (!silent)
360	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
361	sb->s_id);
362	goto out_error;
363
364	/* N.B. after this point bh must be released */
365	got_root:
366	root_block = sbi->s_root_block;
367
368	/* Find out which kind of FS we have */
369	boot_bh = sb_bread(sb, 0);
370	if (!boot_bh) {
371	printk(KERN_ERR "AFFS: Cannot read boot block\n");
372	goto out_error;
373	}
2b943cf0	374	memcpy(sig, boot_bh->b_data, 4);
1da177e4	375	brelse(boot_bh);
2b943cf0	376	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	377
	378	/* Dircache filesystems are compatible with non-dircache ones
	379	* when reading. As long as they aren't supported, writing is
	380	* not recommended.
	381	*/
	382	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	383	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	384	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	385	sb->s_id);
	386	sb->s_flags \|= MS_RDONLY;
	387	}
	388	switch (chksum) {
	389	case MUFS_FS:
	390	case MUFS_INTLFFS:
	391	case MUFS_DCFFS:
	392	sbi->s_flags \|= SF_MUFS;
	393	/* fall thru */
	394	case FS_INTLFFS:
	395	case FS_DCFFS:
	396	sbi->s_flags \|= SF_INTL;
	397	break;
	398	case MUFS_FFS:
	399	sbi->s_flags \|= SF_MUFS;
	400	break;
	401	case FS_FFS:
	402	break;
	403	case MUFS_OFS:
	404	sbi->s_flags \|= SF_MUFS;
	405	/* fall thru */
	406	case FS_OFS:
	407	sbi->s_flags \|= SF_OFS;
	408	sb->s_flags \|= MS_NOEXEC;
	409	break;
	410	case MUFS_DCOFS:
	411	case MUFS_INTLOFS:
	412	sbi->s_flags \|= SF_MUFS;
	413	case FS_DCOFS:
	414	case FS_INTLOFS:
	415	sbi->s_flags \|= SF_INTL \| SF_OFS;
	416	sb->s_flags \|= MS_NOEXEC;
	417	break;
	418	default:
	419	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	420	sb->s_id, chksum);
	421	goto out_error;
	422	}
	423
	424	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	425	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	426	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	427	len > 31 ? 31 : len,
1da177e4	428	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	429	sig, sig[3] + '0', blocksize);
1da177e4 LT	430	}
	431
	432	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	433
	434	sbi->s_data_blksize = sb->s_blocksize;
	435	if (sbi->s_flags & SF_OFS)
	436	sbi->s_data_blksize -= 24;
	437
	438	/* Keep super block in cache */
	439	sbi->s_root_bh = root_bh;
	440	/* N.B. after this point s_root_bh must be released */
	441
	442	tmp_flags = sb->s_flags;
	443	if (affs_init_bitmap(sb, &tmp_flags))
	444	goto out_error;
	445	sb->s_flags = tmp_flags;
	446
	447	/* set up enough so that it can read an inode */
	448
	449	root_inode = iget(sb, root_block);
	450	sb->s_root = d_alloc_root(root_inode);
	451	if (!sb->s_root) {
	452	printk(KERN_ERR "AFFS: Get root inode failed\n");
	453	goto out_error;
	454	}
	455	sb->s_root->d_op = &affs_dentry_operations;
	456
	457	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	458	return 0;
	459
	460	/*
	461	* Begin the cascaded cleanup ...
	462	*/
	463	out_error:
	464	if (root_inode)
	465	iput(root_inode);
f99d49ad	466	kfree(sbi->s_bitmap);
1da177e4	467	affs_brelse(root_bh);
f99d49ad	468	kfree(sbi->s_prefix);
1da177e4 LT	469	kfree(sbi);
	470	sb->s_fs_info = NULL;
	471	return -EINVAL;
	472	}
	473
	474	static int
	475	affs_remount(struct super_block sb, int flags, char *data)
	476	{
	477	struct affs_sb_info *sbi = AFFS_SB(sb);
	478	int blocksize;
	479	uid_t uid;
	480	gid_t gid;
	481	int mode;
	482	int reserved;
	483	int root_block;
	484	unsigned long mount_flags;
	485	int res = 0;
	486
	487	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	488
	489	*flags \|= MS_NODIRATIME;
	490
	491	if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
	492	&blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
	493	return -EINVAL;
	494	sbi->s_flags = mount_flags;
	495	sbi->s_mode = mode;
	496	sbi->s_uid = uid;
	497	sbi->s_gid = gid;
	498
	499	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	500	return 0;
	501	if (*flags & MS_RDONLY) {
	502	sb->s_dirt = 1;
	503	while (sb->s_dirt)
	504	affs_write_super(sb);
	505	affs_free_bitmap(sb);
	506	} else
	507	res = affs_init_bitmap(sb, flags);
	508
	509	return res;
	510	}
	511
	512	static int
726c3342	513	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	514	{
726c3342	515	struct super_block *sb = dentry->d_sb;
1da177e4 LT	516	int free;
	517
	518	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	519	AFFS_SB(sb)->s_reserved);
	520
	521	free = affs_count_free_blocks(sb);
	522	buf->f_type = AFFS_SUPER_MAGIC;
	523	buf->f_bsize = sb->s_blocksize;
	524	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	525	buf->f_bfree = free;
	526	buf->f_bavail = free;
	527	return 0;
	528	}
	529
454e2398 DH	530	static int affs_get_sb(struct file_system_type *fs_type,
454e2398 DH	531	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	532	{
454e2398 DH	533	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
454e2398 DH	534	mnt);
1da177e4 LT	535	}
	536
	537	static struct file_system_type affs_fs_type = {
	538	.owner = THIS_MODULE,
	539	.name = "affs",
	540	.get_sb = affs_get_sb,
	541	.kill_sb = kill_block_super,
	542	.fs_flags = FS_REQUIRES_DEV,
	543	};
	544
	545	static int __init init_affs_fs(void)
	546	{
	547	int err = init_inodecache();
	548	if (err)
	549	goto out1;
	550	err = register_filesystem(&affs_fs_type);
	551	if (err)
	552	goto out;
	553	return 0;
	554	out:
	555	destroy_inodecache();
	556	out1:
	557	return err;
	558	}
	559
	560	static void __exit exit_affs_fs(void)
	561	{
	562	unregister_filesystem(&affs_fs_type);
	563	destroy_inodecache();
	564	}
	565
	566	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	567	MODULE_LICENSE("GPL");
	568
	569	module_init(init_affs_fs)
	570	module_exit(exit_affs_fs)