bsd/dev/vn/shadow.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #ifndef __VN_SHADOW_H__
  32 #define __VN_SHADOW_H__
  33
  34 #include <sys/appleapiopts.h>
  35
  36 #ifdef __APPLE_API_PRIVATE
  37
  38 typedef struct shadow_map shadow_map_t;
  39
  40 boolean_t
  41 shadow_map_read(shadow_map_t * map, u_long block_offset, u_long block_count,
  42                 u_long * incr_block_offset, u_long * incr_block_count);
  43 boolean_t
  44 shadow_map_write(shadow_map_t * map, u_long block_offset, u_long block_count,
  45                  u_long * incr_block_offset, u_long * incr_block_count);
  46 boolean_t
  47 shadow_map_is_written(shadow_map_t * map, u_long block_offset);
  48
  49 u_long
  50 shadow_map_shadow_size(shadow_map_t * map);
  51
  52 shadow_map_t *
  53 shadow_map_create(off_t file_size, off_t shadow_size,
  54                   unsigned long band_size, unsigned long block_size);
  55 void
  56 shadow_map_free(shadow_map_t * map);
  57
  58 #endif /* __APPLE_API_PRIVATE */
  59 #endif /* __VN_SHADOW_H__ */
  60
  61
  62