xnu-792.tar.gz

[apple/xnu.git] / bsd / dev / vn / shadow.h

/*
 * Copyright (c) 1999, 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_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, u_long block_offset, u_long block_count,
		u_long * incr_block_offset, u_long * incr_block_count);
boolean_t
shadow_map_write(shadow_map_t * map, u_long block_offset, u_long block_count,
		 u_long * incr_block_offset, u_long * incr_block_count);
boolean_t
shadow_map_is_written(shadow_map_t * map, u_long block_offset);

u_long
shadow_map_shadow_size(shadow_map_t * map);

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

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