[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 <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,
	.show_options	= generic_show_options,
};

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 = 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]);
			if (!vol)
				return 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;

	save_mount_options(sb, data);

	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;
	char			*new_opts = kstrdup(data, GFP_KERNEL);

	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)) {
		kfree(new_opts);
		return -EINVAL;
	}
	kfree(sb->s_options);
	sb->s_options = new_opts;

	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,
e9b3961b	125	.show_options = generic_show_options,
1da177e4 LT	126	};
	127
	128	enum {
	129	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
	130	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
	131	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
	132	};
	133
	134	static match_table_t tokens = {
	135	{Opt_bs, "bs=%u"},
	136	{Opt_mode, "mode=%o"},
	137	{Opt_mufs, "mufs"},
	138	{Opt_prefix, "prefix=%s"},
	139	{Opt_protect, "protect"},
	140	{Opt_reserved, "reserved=%u"},
	141	{Opt_root, "root=%u"},
	142	{Opt_setgid, "setgid=%u"},
	143	{Opt_setuid, "setuid=%u"},
	144	{Opt_verbose, "verbose"},
	145	{Opt_volume, "volume=%s"},
	146	{Opt_ignore, "grpquota"},
	147	{Opt_ignore, "noquota"},
	148	{Opt_ignore, "quota"},
	149	{Opt_ignore, "usrquota"},
	150	{Opt_err, NULL},
	151	};
	152
	153	static int
	154	parse_options(char options, uid_t uid, gid_t gid, int mode, int reserved, s32 root,
	155	int blocksize, char prefix, char volume, unsigned long *mount_opts)
	156	{
	157	char *p;
	158	substring_t args[MAX_OPT_ARGS];
	159
	160	/* Fill in defaults */
	161
	162	*uid = current->uid;
	163	*gid = current->gid;
	164	*reserved = 2;
	165	*root = -1;
	166	*blocksize = -1;
	167	volume[0] = ':';
	168	volume[1] = 0;
	169	*mount_opts = 0;
	170	if (!options)
	171	return 1;
	172
	173	while ((p = strsep(&options, ",")) != NULL) {
	174	int token, n, option;
	175	if (!*p)
	176	continue;
	177
	178	token = match_token(p, tokens, args);
	179	switch (token) {
	180	case Opt_bs:
	181	if (match_int(&args[0], &n))
	182	return -EINVAL;
	183	if (n != 512 && n != 1024 && n != 2048
	184	&& n != 4096) {
	185	printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
	186	return 0;
	187	}
	188	*blocksize = n;
	189	break;
190	case Opt_mode:
191	if (match_octal(&args[0], &option))
192	return 1;
193	*mode = option & 0777;
194	*mount_opts \|= SF_SETMODE;
195	break;
196	case Opt_mufs:
197	*mount_opts \|= SF_MUFS;
198	break;
199	case Opt_prefix:
f99d49ad JJ	200	/* Free any previous prefix */
f99d49ad JJ	201	kfree(*prefix);
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]);
6db27dd9 JM	235	if (!vol)
6db27dd9 JM	236	return 0;
1da177e4 LT	237	strlcpy(volume, vol, 32);
	238	kfree(vol);
	239	break;
	240	}
	241	case Opt_ignore:
	242	/* Silently ignore the quota options */
	243	break;
	244	default:
	245	printk("AFFS: Unrecognized mount option \"%s\" "
	246	"or missing value\n", p);
	247	return 0;
	248	}
	249	}
	250	return 1;
	251	}
	252
	253	/* This function definitely needs to be split up. Some fine day I'll
	254	* hopefully have the guts to do so. Until then: sorry for the mess.
	255	*/
	256
	257	static int affs_fill_super(struct super_block sb, void data, int silent)
	258	{
	259	struct affs_sb_info *sbi;
	260	struct buffer_head *root_bh = NULL;
	261	struct buffer_head *boot_bh;
	262	struct inode *root_inode = NULL;
	263	s32 root_block;
	264	int size, blocksize;
	265	u32 chksum;
	266	int num_bm;
	267	int i, j;
	268	s32 key;
	269	uid_t uid;
	270	gid_t gid;
	271	int reserved;
	272	unsigned long mount_flags;
	273	int tmp_flags; /* fix remount prototype... */
2b943cf0	274	u8 sig[4];
210f8559	275	int ret = -EINVAL;
1da177e4	276
e9b3961b MS	277	save_mount_options(sb, data);
e9b3961b MS	278
1da177e4 LT	279	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
	280
	281	sb->s_magic = AFFS_SUPER_MAGIC;
	282	sb->s_op = &affs_sops;
	283	sb->s_flags \|= MS_NODIRATIME;
	284
f8314dc6	285	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
1da177e4 LT	286	if (!sbi)
	287	return -ENOMEM;
	288	sb->s_fs_info = sbi;
1da177e4 LT	289	init_MUTEX(&sbi->s_bmlock);
	290
	291	if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
	292	&blocksize,&sbi->s_prefix,
	293	sbi->s_volume, &mount_flags)) {
	294	printk(KERN_ERR "AFFS: Error parsing options\n");
	295	return -EINVAL;
	296	}
	297	/* N.B. after this point s_prefix must be released */
	298
	299	sbi->s_flags = mount_flags;
	300	sbi->s_mode = i;
	301	sbi->s_uid = uid;
	302	sbi->s_gid = gid;
	303	sbi->s_reserved= reserved;
	304
	305	/* Get the size of the device in 512-byte blocks.
	306	* If we later see that the partition uses bigger
	307	* blocks, we will have to change it.
	308	*/
	309
	310	size = sb->s_bdev->bd_inode->i_size >> 9;
	311	pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
	312
	313	affs_set_blocksize(sb, PAGE_SIZE);
	314	/* Try to find root block. Its location depends on the block size. */
	315
	316	i = 512;
	317	j = 4096;
	318	if (blocksize > 0) {
	319	i = j = blocksize;
	320	size = size / (blocksize / 512);
	321	}
	322	for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
	323	sbi->s_root_block = root_block;
	324	if (root_block < 0)
	325	sbi->s_root_block = (reserved + size - 1) / 2;
	326	pr_debug("AFFS: setting blocksize to %d\n", blocksize);
	327	affs_set_blocksize(sb, blocksize);
	328	sbi->s_partition_size = size;
	329
	330	/* The root block location that was calculated above is not
	331	* correct if the partition size is an odd number of 512-
	332	* byte blocks, which will be rounded down to a number of
	333	* 1024-byte blocks, and if there were an even number of
	334	* reserved blocks. Ideally, all partition checkers should
	335	* report the real number of blocks of the real blocksize,
	336	* but since this just cannot be done, we have to try to
	337	* find the root block anyways. In the above case, it is one
	338	* block behind the calculated one. So we check this one, too.
	339	*/
	340	for (num_bm = 0; num_bm < 2; num_bm++) {
	341	pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
	342	"size=%d, reserved=%d\n",
	343	sb->s_id,
	344	sbi->s_root_block + num_bm,
	345	blocksize, size, reserved);
	346	root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
	347	if (!root_bh)
	348	continue;
	349	if (!affs_checksum_block(sb, root_bh) &&
	350	be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
	351	be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
	352	sbi->s_hashsize = blocksize / 4 - 56;
353	sbi->s_root_block += num_bm;
354	key = 1;
355	goto got_root;
356	}
357	affs_brelse(root_bh);
358	root_bh = NULL;
359	}
360	}
361	if (!silent)
362	printk(KERN_ERR "AFFS: No valid root block on device %s\n",
363	sb->s_id);
364	goto out_error;
365
366	/* N.B. after this point bh must be released */
367	got_root:
368	root_block = sbi->s_root_block;
369
370	/* Find out which kind of FS we have */
371	boot_bh = sb_bread(sb, 0);
372	if (!boot_bh) {
373	printk(KERN_ERR "AFFS: Cannot read boot block\n");
374	goto out_error;
375	}
2b943cf0	376	memcpy(sig, boot_bh->b_data, 4);
1da177e4	377	brelse(boot_bh);
2b943cf0	378	chksum = be32_to_cpu((__be32 )sig);
1da177e4 LT	379
	380	/* Dircache filesystems are compatible with non-dircache ones
	381	* when reading. As long as they aren't supported, writing is
	382	* not recommended.
	383	*/
	384	if ((chksum == FS_DCFFS \|\| chksum == MUFS_DCFFS \|\| chksum == FS_DCOFS
	385	\|\| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
	386	printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
	387	sb->s_id);
	388	sb->s_flags \|= MS_RDONLY;
	389	}
	390	switch (chksum) {
	391	case MUFS_FS:
	392	case MUFS_INTLFFS:
	393	case MUFS_DCFFS:
	394	sbi->s_flags \|= SF_MUFS;
	395	/* fall thru */
	396	case FS_INTLFFS:
	397	case FS_DCFFS:
	398	sbi->s_flags \|= SF_INTL;
	399	break;
	400	case MUFS_FFS:
	401	sbi->s_flags \|= SF_MUFS;
	402	break;
	403	case FS_FFS:
	404	break;
	405	case MUFS_OFS:
	406	sbi->s_flags \|= SF_MUFS;
	407	/* fall thru */
	408	case FS_OFS:
	409	sbi->s_flags \|= SF_OFS;
	410	sb->s_flags \|= MS_NOEXEC;
	411	break;
	412	case MUFS_DCOFS:
	413	case MUFS_INTLOFS:
	414	sbi->s_flags \|= SF_MUFS;
	415	case FS_DCOFS:
	416	case FS_INTLOFS:
	417	sbi->s_flags \|= SF_INTL \| SF_OFS;
	418	sb->s_flags \|= MS_NOEXEC;
	419	break;
	420	default:
	421	printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
	422	sb->s_id, chksum);
	423	goto out_error;
	424	}
	425
	426	if (mount_flags & SF_VERBOSE) {
2b943cf0 AV	427	u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
	428	printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
	429	len > 31 ? 31 : len,
1da177e4	430	AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
2b943cf0	431	sig, sig[3] + '0', blocksize);
1da177e4 LT	432	}
	433
	434	sb->s_flags \|= MS_NODEV \| MS_NOSUID;
	435
	436	sbi->s_data_blksize = sb->s_blocksize;
	437	if (sbi->s_flags & SF_OFS)
	438	sbi->s_data_blksize -= 24;
	439
	440	/* Keep super block in cache */
	441	sbi->s_root_bh = root_bh;
	442	/* N.B. after this point s_root_bh must be released */
	443
	444	tmp_flags = sb->s_flags;
	445	if (affs_init_bitmap(sb, &tmp_flags))
	446	goto out_error;
	447	sb->s_flags = tmp_flags;
	448
	449	/* set up enough so that it can read an inode */
	450
210f8559 DH	451	root_inode = affs_iget(sb, root_block);
	452	if (IS_ERR(root_inode)) {
	453	ret = PTR_ERR(root_inode);
	454	goto out_error_noinode;
	455	}
	456
1da177e4 LT	457	sb->s_root = d_alloc_root(root_inode);
	458	if (!sb->s_root) {
	459	printk(KERN_ERR "AFFS: Get root inode failed\n");
	460	goto out_error;
	461	}
	462	sb->s_root->d_op = &affs_dentry_operations;
	463
	464	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
	465	return 0;
	466
	467	/*
	468	* Begin the cascaded cleanup ...
	469	*/
	470	out_error:
	471	if (root_inode)
	472	iput(root_inode);
210f8559	473	out_error_noinode:
f99d49ad	474	kfree(sbi->s_bitmap);
1da177e4	475	affs_brelse(root_bh);
f99d49ad	476	kfree(sbi->s_prefix);
1da177e4 LT	477	kfree(sbi);
1da177e4 LT	478	sb->s_fs_info = NULL;
210f8559	479	return ret;
1da177e4 LT	480	}
	481
	482	static int
	483	affs_remount(struct super_block sb, int flags, char *data)
	484	{
	485	struct affs_sb_info *sbi = AFFS_SB(sb);
	486	int blocksize;
	487	uid_t uid;
	488	gid_t gid;
	489	int mode;
	490	int reserved;
	491	int root_block;
	492	unsigned long mount_flags;
	493	int res = 0;
e9b3961b	494	char *new_opts = kstrdup(data, GFP_KERNEL);
1da177e4 LT	495
	496	pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
	497
	498	*flags \|= MS_NODIRATIME;
	499
e9b3961b MS	500	if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
	501	&blocksize, &sbi->s_prefix, sbi->s_volume,
	502	&mount_flags)) {
	503	kfree(new_opts);
1da177e4	504	return -EINVAL;
e9b3961b MS	505	}
	506	kfree(sb->s_options);
	507	sb->s_options = new_opts;
	508
1da177e4 LT	509	sbi->s_flags = mount_flags;
	510	sbi->s_mode = mode;
	511	sbi->s_uid = uid;
	512	sbi->s_gid = gid;
	513
	514	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
	515	return 0;
	516	if (*flags & MS_RDONLY) {
	517	sb->s_dirt = 1;
	518	while (sb->s_dirt)
	519	affs_write_super(sb);
	520	affs_free_bitmap(sb);
	521	} else
	522	res = affs_init_bitmap(sb, flags);
	523
	524	return res;
	525	}
	526
	527	static int
726c3342	528	affs_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4	529	{
726c3342	530	struct super_block *sb = dentry->d_sb;
1da177e4 LT	531	int free;
	532
	533	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
	534	AFFS_SB(sb)->s_reserved);
	535
	536	free = affs_count_free_blocks(sb);
	537	buf->f_type = AFFS_SUPER_MAGIC;
	538	buf->f_bsize = sb->s_blocksize;
	539	buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
	540	buf->f_bfree = free;
	541	buf->f_bavail = free;
	542	return 0;
	543	}
	544
454e2398 DH	545	static int affs_get_sb(struct file_system_type *fs_type,
454e2398 DH	546	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	547	{
454e2398 DH	548	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
454e2398 DH	549	mnt);
1da177e4 LT	550	}
	551
	552	static struct file_system_type affs_fs_type = {
	553	.owner = THIS_MODULE,
	554	.name = "affs",
	555	.get_sb = affs_get_sb,
	556	.kill_sb = kill_block_super,
	557	.fs_flags = FS_REQUIRES_DEV,
	558	};
	559
	560	static int __init init_affs_fs(void)
	561	{
	562	int err = init_inodecache();
	563	if (err)
	564	goto out1;
	565	err = register_filesystem(&affs_fs_type);
	566	if (err)
	567	goto out;
	568	return 0;
	569	out:
	570	destroy_inodecache();
	571	out1:
	572	return err;
	573	}
	574
	575	static void __exit exit_affs_fs(void)
	576	{
	577	unregister_filesystem(&affs_fs_type);
	578	destroy_inodecache();
	579	}
	580
	581	MODULE_DESCRIPTION("Amiga filesystem support for Linux");
	582	MODULE_LICENSE("GPL");
	583
	584	module_init(init_affs_fs)
	585	module_exit(exit_affs_fs)