[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 <linux/sched.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 struct kmem_cache * 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, GFP_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(struct kmem_cache *cachep, void *foo)
{
	struct affs_inode_info *ei = (struct affs_inode_info *) foo;

	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);
	if (affs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	kmem_cache_destroy(affs_inode_cachep);
}

static const struct super_operations affs_sops = {
	.alloc_inode	= affs_alloc_inode,
	.destroy_inode	= affs_destroy_inode,
	.write_inode	= affs_write_inode,
	.put_inode	= affs_put_inode,
	.drop_inode	= affs_drop_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];
	int			 ret = -EINVAL;

	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 = affs_iget(sb, root_block);
	if (IS_ERR(root_inode)) {
		ret = PTR_ERR(root_inode);
		goto out_error_noinode;
	}

	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);
out_error_noinode:
	kfree(sbi->s_bitmap);
	affs_brelse(root_bh);
	kfree(sbi->s_prefix);
	kfree(sbi);
	sb->s_fs_info = NULL;
	return ret;
}

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>
e8edc6e0	18	#include <linux/sched.h>
1da177e4 LT	19	#include "affs.h"
	20
	21	extern struct timezone sys_tz;
	22
726c3342	23	static int affs_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4 LT	24	static int affs_remount (struct super_block sb, int flags, char *data);
	25
	26	static void
	27	affs_put_super(struct super_block *sb)
	28	{
	29	struct affs_sb_info *sbi = AFFS_SB(sb);
	30	pr_debug("AFFS: put_super()\n");
	31
	32	if (!(sb->s_flags & MS_RDONLY)) {
	33	AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
	34	secs_to_datestamp(get_seconds(),
	35	&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
	36	affs_fix_checksum(sb, sbi->s_root_bh);
	37	mark_buffer_dirty(sbi->s_root_bh);
	38	}
	39
f99d49ad	40	kfree(sbi->s_prefix);
1da177e4 LT	41	affs_free_bitmap(sb);
	42	affs_brelse(sbi->s_root_bh);
	43	kfree(sbi);
	44	sb->s_fs_info = NULL;
	45	return;
	46	}
	47
	48	static void
	49	affs_write_super(struct super_block *sb)
	50	{
	51	int clean = 2;
	52	struct affs_sb_info *sbi = AFFS_SB(sb);
	53
	54	if (!(sb->s_flags & MS_RDONLY)) {
	55	// if (sbi->s_bitmap[i].bm_bh) {
	56	// if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
	57	// clean = 0;
	58	AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
	59	secs_to_datestamp(get_seconds(),
	60	&AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
	61	affs_fix_checksum(sb, sbi->s_root_bh);
	62	mark_buffer_dirty(sbi->s_root_bh);
	63	sb->s_dirt = !clean; /* redo until bitmap synced */
	64	} else
	65	sb->s_dirt = 0;
	66
	67	pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
	68	}
	69
e18b890b	70	static struct kmem_cache * affs_inode_cachep;
1da177e4 LT	71
	72	static struct inode affs_alloc_inode(struct super_block sb)
	73	{
	74	struct affs_inode_info *ei;
e94b1766	75	ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
1da177e4 LT	76	if (!ei)
	77	return NULL;
	78	ei->vfs_inode.i_version = 1;
	79	return &ei->vfs_inode;
	80	}
	81
	82	static void affs_destroy_inode(struct inode *inode)
	83	{
	84	kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
	85	}
	86
4ba9b9d0	87	static void init_once(struct kmem_cache cachep, void foo)
1da177e4 LT	88	{
	89	struct affs_inode_info ei = (struct affs_inode_info ) foo;
	90
a35afb83 CL	91	init_MUTEX(&ei->i_link_lock);
	92	init_MUTEX(&ei->i_ext_lock);
	93	inode_init_once(&ei->vfs_inode);
1da177e4 LT	94	}
	95
	96	static int init_inodecache(void)
	97	{
	98	affs_inode_cachep = kmem_cache_create("affs_inode_cache",
	99	sizeof(struct affs_inode_info),
fffb60f9 PJ	100	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	101	SLAB_MEM_SPREAD),
20c2df83	102	init_once);
1da177e4 LT	103	if (affs_inode_cachep == NULL)
	104	return -ENOMEM;
	105	return 0;
	106	}
	107
	108	static void destroy_inodecache(void)
	109	{
1a1d92c1	110	kmem_cache_destroy(affs_inode_cachep);
1da177e4 LT	111	}
1da177e4 LT	112
ee9b6d61	113	static const struct super_operations affs_sops = {
1da177e4 LT	114	.alloc_inode = affs_alloc_inode,
1da177e4 LT	115	.destroy_inode = affs_destroy_inode,
1da177e4 LT	116	.write_inode = affs_write_inode,
1da177e4 LT	117	.put_inode = affs_put_inode,
2be3c790	118	.drop_inode = affs_drop_inode,
1da177e4 LT	119	.delete_inode = affs_delete_inode,
	120	.clear_inode = affs_clear_inode,
	121	.put_super = affs_put_super,
	122	.write_super = affs_write_super,
	123	.statfs = affs_statfs,
	124	.remount_fs = affs_remount,
	125	};
	126
	127	enum {
	128	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	129	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	130	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	131	};
	132
	133	static match_table_t tokens = {
	134	{Opt_bs, "bs=%u"},
	135	{Opt_mode, "mode=%o"},
	136	{Opt_mufs, "mufs"},
	137	{Opt_prefix, "prefix=%s"},
	138	{Opt_protect, "protect"},
	139	{Opt_reserved, "reserved=%u"},
	140	{Opt_root, "root=%u"},
	141	{Opt_setgid, "setgid=%u"},
	142	{Opt_setuid, "setuid=%u"},
	143	{Opt_verbose, "verbose"},
	144	{Opt_volume, "volume=%s"},
	145	{Opt_ignore, "grpquota"},
	146	{Opt_ignore, "noquota"},
	147	{Opt_ignore, "quota"},
	148	{Opt_ignore, "usrquota"},
	149	{Opt_err, NULL},
	150	};
	151
	152	static int
	153	parse_options(char options, uid_t uid, gid_t gid, int mode, int reserved, s32 root,
	154	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	155	{
	156	char *p;
	157	substring_t args[MAX_OPT_ARGS];
	158
	159	/* Fill in defaults */
	160
	161	*uid = current->uid;
	162	*gid = current->gid;
	163	*reserved = 2;
	164	*root = -1;
	165	*blocksize = -1;
	166	volume[0] = ':';
	167	volume[1] = 0;
	168	*mount_opts = 0;
	169	if (!options)
	170	return 1;
	171
	172	while ((p = strsep(&options, ",")) != NULL) {
	173	int token, n, option;
	174	if (!*p)
	175	continue;
	176
	177	token = match_token(p, tokens, args);
	178	switch (token) {
	179	case Opt_bs:
	180	if (match_int(&args[0], &n))
	181	return -EINVAL;
	182	if (n != 512 && n != 1024 && n != 2048
183	&& n != 4096) {
184	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
185	return 0;
186	}
187	*blocksize = n;
188	break;
189	case Opt_mode:
190	if (match_octal(&args[0], &option))
191	return 1;
192	*mode = option & 0777;
193	*mount_opts \|= SF_SETMODE;
194	break;
195	case Opt_mufs:
196	*mount_opts \|= SF_MUFS;
197	break;
198	case Opt_prefix:
f99d49ad JJ	199	/* Free any previous prefix */
	200	kfree(*prefix);
	201	*prefix = NULL;
1da177e4 LT	202	*prefix = match_strdup(&args[0]);
	203	if (!*prefix)
	204	return 0;
	205	*mount_opts \|= SF_PREFIX;
	206	break;
	207	case Opt_protect:
	208	*mount_opts \|= SF_IMMUTABLE;
	209	break;
	210	case Opt_reserved:
	211	if (match_int(&args[0], reserved))
	212	return 1;
	213	break;
	214	case Opt_root:
	215	if (match_int(&args[0], root))
	216	return 1;
	217	break;
	218	case Opt_setgid:
	219	if (match_int(&args[0], &option))
	220	return 1;
	221	*gid = option;
	222	*mount_opts \|= SF_SETGID;
	223	break;
	224	case Opt_setuid:
	225	if (match_int(&args[0], &option))
	226	return -EINVAL;
	227	*uid = option;
	228	*mount_opts \|= SF_SETUID;
	229	break;
	230	case Opt_verbose:
	231	*mount_opts \|= SF_VERBOSE;
	232	break;
	233	case Opt_volume: {
	234	char *vol = match_strdup(&args[0]);
	235	strlcpy(volume, vol, 32);
	236	kfree(vol);
	237	break;
	238	}
	239	case Opt_ignore:
	240	/* Silently ignore the quota options */
	241	break;
	242	default:
	243	printk("AFFS: Unrecognized mount option \"%s\" "
	244	"or missing value\n", p);
	245	return 0;
	246	}
	247	}
	248	return 1;
	249	}
	250
	251	/* This function definitely needs to be split up. Some fine day I'll
	252	* hopefully have the guts to do so. Until then: sorry for the mess.
	253	*/
	254
	255	static int affs_fill_super(struct super_block sb, void data, int silent)
	256	{
	257	struct affs_sb_info *sbi;
	258	struct buffer_head *root_bh = NULL;
	259	struct buffer_head *boot_bh;
	260	struct inode *root_inode = NULL;
	261	s32 root_block;
	262	int size, blocksize;
	263	u32 chksum;
	264	int num_bm;
	265	int i, j;
266	s32 key;
267	uid_t uid;
268	gid_t gid;
269	int reserved;
270	unsigned long mount_flags;
271	int tmp_flags; /* fix remount prototype... */
2b943cf0	272	u8 sig[4];
210f8559	273	int ret = -EINVAL;
1da177e4 LT	274
	275	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	276
	277	sb->s_magic = AFFS_SUPER_MAGIC;
	278	sb->s_op = &affs_sops;
	279	sb->s_flags \|= MS_NODIRATIME;
	280
f8314dc6	281	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	282	if (!sbi)
	283	return -ENOMEM;
	284	sb->s_fs_info = sbi;
1da177e4 LT	285	init_MUTEX(&sbi->s_bmlock);
	286
	287	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	288	&blocksize,&sbi->s_prefix,
	289	sbi->s_volume, &mount_flags)) {
	290	printk(KERN_ERR "AFFS: Error parsing options\n");
	291	return -EINVAL;
	292	}
	293	/* N.B. after this point s_prefix must be released */
	294
	295	sbi->s_flags = mount_flags;
	296	sbi->s_mode = i;
	297	sbi->s_uid = uid;
	298	sbi->s_gid = gid;
	299	sbi->s_reserved= reserved;
	300
	301	/* Get the size of the device in 512-byte blocks.
	302	* If we later see that the partition uses bigger
	303	* blocks, we will have to change it.
	304	*/
	305
	306	size = sb->s_bdev->bd_inode->i_size >> 9;
	307	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	308
	309	affs_set_blocksize(sb, PAGE_SIZE);
	310	/* Try to find root block. Its location depends on the block size. */
	311
	312	i = 512;
	313	j = 4096;
	314	if (blocksize > 0) {
	315	i = j = blocksize;
	316	size = size / (blocksize / 512);
	317	}
	318	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	319	sbi->s_root_block = root_block;
	320	if (root_block < 0)
	321	sbi->s_root_block = (reserved + size - 1) / 2;
	322	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	323	affs_set_blocksize(sb, blocksize);
	324	sbi->s_partition_size = size;
	325
	326	/* The root block location that was calculated above is not
	327	* correct if the partition size is an odd number of 512-
	328	* byte blocks, which will be rounded down to a number of
	329	* 1024-byte blocks, and if there were an even number of
	330	* reserved blocks. Ideally, all partition checkers should
	331	* report the real number of blocks of the real blocksize,
	332	* but since this just cannot be done, we have to try to
	333	* find the root block anyways. In the above case, it is one
	334	* block behind the calculated one. So we check this one, too.
	335	*/
	336	for (num_bm = 0; num_bm < 2; num_bm++) {
	337	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	338	"size=%d, reserved=%d\n",
	339	sb->s_id,
	340	sbi->s_root_block + num_bm,
	341	blocksize, size, reserved);
	342	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	343	if (!root_bh)
	344	continue;
	345	if (!affs_checksum_block(sb, root_bh) &&
	346	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	347	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	348	sbi->s_hashsize = blocksize / 4 - 56;
349	sbi->s_root_block += num_bm;
350	key = 1;
351	goto got_root;
352	}
353	affs_brelse(root_bh);
354	root_bh = NULL;
355	}
356	}
357	if (!silent)
358	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
359	sb->s_id);
360	goto out_error;
361
362	/* N.B. after this point bh must be released */
363	got_root:
364	root_block = sbi->s_root_block;
365
366	/* Find out which kind of FS we have */
367	boot_bh = sb_bread(sb, 0);
368	if (!boot_bh) {
369	printk(KERN_ERR "AFFS: Cannot read boot block\n");
370	goto out_error;
371	}
2b943cf0	372	memcpy(sig, boot_bh->b_data, 4);
1da177e4	373	brelse(boot_bh);
2b943cf0	374	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	375
	376	/* Dircache filesystems are compatible with non-dircache ones
	377	* when reading. As long as they aren't supported, writing is
	378	* not recommended.
	379	*/
	380	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	381	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	382	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	383	sb->s_id);
	384	sb->s_flags \|= MS_RDONLY;
	385	}
	386	switch (chksum) {
	387	case MUFS_FS:
	388	case MUFS_INTLFFS:
	389	case MUFS_DCFFS:
	390	sbi->s_flags \|= SF_MUFS;
	391	/* fall thru */
	392	case FS_INTLFFS:
	393	case FS_DCFFS:
	394	sbi->s_flags \|= SF_INTL;
	395	break;
	396	case MUFS_FFS:
	397	sbi->s_flags \|= SF_MUFS;
	398	break;
	399	case FS_FFS:
	400	break;
	401	case MUFS_OFS:
	402	sbi->s_flags \|= SF_MUFS;
	403	/* fall thru */
	404	case FS_OFS:
	405	sbi->s_flags \|= SF_OFS;
	406	sb->s_flags \|= MS_NOEXEC;
	407	break;
	408	case MUFS_DCOFS:
	409	case MUFS_INTLOFS:
	410	sbi->s_flags \|= SF_MUFS;
	411	case FS_DCOFS:
	412	case FS_INTLOFS:
	413	sbi->s_flags \|= SF_INTL \| SF_OFS;
	414	sb->s_flags \|= MS_NOEXEC;
	415	break;
	416	default:
	417	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	418	sb->s_id, chksum);
	419	goto out_error;
	420	}
	421
	422	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	423	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	424	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	425	len > 31 ? 31 : len,
1da177e4	426	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	427	sig, sig[3] + '0', blocksize);
1da177e4 LT	428	}
	429
	430	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	431
	432	sbi->s_data_blksize = sb->s_blocksize;
	433	if (sbi->s_flags & SF_OFS)
	434	sbi->s_data_blksize -= 24;
	435
	436	/* Keep super block in cache */
	437	sbi->s_root_bh = root_bh;
	438	/* N.B. after this point s_root_bh must be released */
	439
	440	tmp_flags = sb->s_flags;
	441	if (affs_init_bitmap(sb, &tmp_flags))
	442	goto out_error;
	443	sb->s_flags = tmp_flags;
	444
	445	/* set up enough so that it can read an inode */
	446
210f8559 DH	447	root_inode = affs_iget(sb, root_block);
	448	if (IS_ERR(root_inode)) {
	449	ret = PTR_ERR(root_inode);
	450	goto out_error_noinode;
	451	}
	452
1da177e4 LT	453	sb->s_root = d_alloc_root(root_inode);
	454	if (!sb->s_root) {
	455	printk(KERN_ERR "AFFS: Get root inode failed\n");
	456	goto out_error;
	457	}
	458	sb->s_root->d_op = &affs_dentry_operations;
	459
	460	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	461	return 0;
	462
	463	/*
	464	* Begin the cascaded cleanup ...
	465	*/
	466	out_error:
	467	if (root_inode)
	468	iput(root_inode);
210f8559	469	out_error_noinode:
f99d49ad	470	kfree(sbi->s_bitmap);
1da177e4	471	affs_brelse(root_bh);
f99d49ad	472	kfree(sbi->s_prefix);
1da177e4 LT	473	kfree(sbi);
1da177e4 LT	474	sb->s_fs_info = NULL;
210f8559	475	return ret;
1da177e4 LT	476	}
	477
	478	static int
	479	affs_remount(struct super_block sb, int flags, char *data)
	480	{
	481	struct affs_sb_info *sbi = AFFS_SB(sb);
	482	int blocksize;
	483	uid_t uid;
	484	gid_t gid;
	485	int mode;
	486	int reserved;
	487	int root_block;
	488	unsigned long mount_flags;
	489	int res = 0;
	490
	491	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	492
	493	*flags \|= MS_NODIRATIME;
	494
	495	if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
	496	&blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
	497	return -EINVAL;
	498	sbi->s_flags = mount_flags;
	499	sbi->s_mode = mode;
	500	sbi->s_uid = uid;
	501	sbi->s_gid = gid;
	502
	503	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	504	return 0;
	505	if (*flags & MS_RDONLY) {
	506	sb->s_dirt = 1;
	507	while (sb->s_dirt)
	508	affs_write_super(sb);
	509	affs_free_bitmap(sb);
	510	} else
	511	res = affs_init_bitmap(sb, flags);
	512
	513	return res;
	514	}
	515
	516	static int
726c3342	517	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	518	{
726c3342	519	struct super_block *sb = dentry->d_sb;
1da177e4 LT	520	int free;
	521
	522	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	523	AFFS_SB(sb)->s_reserved);
	524
	525	free = affs_count_free_blocks(sb);
	526	buf->f_type = AFFS_SUPER_MAGIC;
	527	buf->f_bsize = sb->s_blocksize;
	528	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	529	buf->f_bfree = free;
	530	buf->f_bavail = free;
	531	return 0;
	532	}
	533
454e2398 DH	534	static int affs_get_sb(struct file_system_type *fs_type,
454e2398 DH	535	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	536	{
454e2398 DH	537	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
454e2398 DH	538	mnt);
1da177e4 LT	539	}
	540
	541	static struct file_system_type affs_fs_type = {
	542	.owner = THIS_MODULE,
	543	.name = "affs",
	544	.get_sb = affs_get_sb,
	545	.kill_sb = kill_block_super,
	546	.fs_flags = FS_REQUIRES_DEV,
	547	};
	548
	549	static int __init init_affs_fs(void)
	550	{
	551	int err = init_inodecache();
	552	if (err)
	553	goto out1;
	554	err = register_filesystem(&affs_fs_type);
	555	if (err)
	556	goto out;
	557	return 0;
	558	out:
	559	destroy_inodecache();
	560	out1:
	561	return err;
	562	}
	563
	564	static void __exit exit_affs_fs(void)
	565	{
	566	unregister_filesystem(&affs_fs_type);
	567	destroy_inodecache();
	568	}
	569
	570	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	571	MODULE_LICENSE("GPL");
	572
	573	module_init(init_affs_fs)
	574	module_exit(exit_affs_fs)