/*
 * Copyright (c) 1999, 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#ifndef __VN_SHADOW_H__
#define __VN_SHADOW_H__

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_PRIVATE

typedef struct shadow_map shadow_map_t;

boolean_t
shadow_map_read(shadow_map_t * map, uint32_t block_offset, uint32_t block_count,
		uint32_t * incr_block_offset, uint32_t * incr_block_count);
boolean_t
shadow_map_write(shadow_map_t * map, uint32_t block_offset, uint32_t block_count,
		 uint32_t * incr_block_offset, uint32_t * incr_block_count);
boolean_t
shadow_map_is_written(shadow_map_t * map, uint32_t block_offset);

uint32_t
shadow_map_shadow_size(shadow_map_t * map);

shadow_map_t *
shadow_map_create(off_t file_size, off_t shadow_size, 
		  uint32_t band_size, uint32_t block_size);
void
shadow_map_free(shadow_map_t * map);

#endif /* __APPLE_API_PRIVATE */
#endif /* __VN_SHADOW_H__ */