linux/drivers/md/dm-cache-block-types.h
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   1/*
   2 * Copyright (C) 2012 Red Hat, Inc.
   3 *
   4 * This file is released under the GPL.
   5 */
   6
   7#ifndef DM_CACHE_BLOCK_TYPES_H
   8#define DM_CACHE_BLOCK_TYPES_H
   9
  10#include "persistent-data/dm-block-manager.h"
  11
  12/*----------------------------------------------------------------*/
  13
  14/*
  15 * It's helpful to get sparse to differentiate between indexes into the
  16 * origin device, indexes into the cache device, and indexes into the
  17 * discard bitset.
  18 */
  19
  20typedef dm_block_t __bitwise__ dm_oblock_t;
  21typedef uint32_t __bitwise__ dm_cblock_t;
  22typedef dm_block_t __bitwise__ dm_dblock_t;
  23
  24static inline dm_oblock_t to_oblock(dm_block_t b)
  25{
  26        return (__force dm_oblock_t) b;
  27}
  28
  29static inline dm_block_t from_oblock(dm_oblock_t b)
  30{
  31        return (__force dm_block_t) b;
  32}
  33
  34static inline dm_cblock_t to_cblock(uint32_t b)
  35{
  36        return (__force dm_cblock_t) b;
  37}
  38
  39static inline uint32_t from_cblock(dm_cblock_t b)
  40{
  41        return (__force uint32_t) b;
  42}
  43
  44static inline dm_dblock_t to_dblock(dm_block_t b)
  45{
  46        return (__force dm_dblock_t) b;
  47}
  48
  49static inline dm_block_t from_dblock(dm_dblock_t b)
  50{
  51        return (__force dm_block_t) b;
  52}
  53
  54#endif /* DM_CACHE_BLOCK_TYPES_H */
  55
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