bsd/dev/vn/shadow.h

   1 /*
   2  * Copyright (c) 1999, 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #ifndef __VN_SHADOW_H__
  24 #define __VN_SHADOW_H__
  25
  26 #include <sys/appleapiopts.h>
  27
  28 #ifdef __APPLE_API_PRIVATE
  29
  30 typedef struct shadow_map shadow_map_t;
  31
  32 boolean_t
  33 shadow_map_read(shadow_map_t * map, u_long block_offset, u_long block_count,
  34                 u_long * incr_block_offset, u_long * incr_block_count);
  35 boolean_t
  36 shadow_map_write(shadow_map_t * map, u_long block_offset, u_long block_count,
  37                  u_long * incr_block_offset, u_long * incr_block_count);
  38 boolean_t
  39 shadow_map_is_written(shadow_map_t * map, u_long block_offset);
  40
  41 u_long
  42 shadow_map_shadow_size(shadow_map_t * map);
  43
  44 shadow_map_t *
  45 shadow_map_create(off_t file_size, off_t shadow_size,
  46                   unsigned long band_size, unsigned long block_size);
  47 void
  48 shadow_map_free(shadow_map_t * map);
  49
  50 #endif /* __APPLE_API_PRIVATE */
  51 #endif /* __VN_SHADOW_H__ */
  52
  53
  54