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  * 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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef __VN_SHADOW_H__
  25 #define __VN_SHADOW_H__
  26
  27 #include <sys/appleapiopts.h>
  28
  29 #ifdef __APPLE_API_PRIVATE
  30
  31 typedef struct shadow_map shadow_map_t;
  32
  33 boolean_t
  34 shadow_map_read(shadow_map_t * map, u_long block_offset, u_long block_count,
  35                 u_long * incr_block_offset, u_long * incr_block_count);
  36 boolean_t
  37 shadow_map_write(shadow_map_t * map, u_long block_offset, u_long block_count,
  38                  u_long * incr_block_offset, u_long * incr_block_count);
  39 boolean_t
  40 shadow_map_is_written(shadow_map_t * map, u_long block_offset);
  41
  42 u_long
  43 shadow_map_shadow_size(shadow_map_t * map);
  44
  45 shadow_map_t *
  46 shadow_map_create(off_t file_size, off_t shadow_size,
  47                   unsigned long band_size, unsigned long block_size);
  48 void
  49 shadow_map_free(shadow_map_t * map);
  50
  51 #endif /* __APPLE_API_PRIVATE */
  52 #endif /* __VN_SHADOW_H__ */
  53
  54
  55