drivers/md/dm-cache-block-types.h

   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
  20 typedef dm_block_t __bitwise dm_oblock_t;
  21 typedef uint32_t __bitwise dm_cblock_t;
  22 typedef dm_block_t __bitwise dm_dblock_t;
  23
  24 static inline dm_oblock_t to_oblock(dm_block_t b)
  25 {
  26         return (__force dm_oblock_t) b;
  27 }
  28
  29 static inline dm_block_t from_oblock(dm_oblock_t b)
  30 {
  31         return (__force dm_block_t) b;
  32 }
  33
  34 static inline dm_cblock_t to_cblock(uint32_t b)
  35 {
  36         return (__force dm_cblock_t) b;
  37 }
  38
  39 static inline uint32_t from_cblock(dm_cblock_t b)
  40 {
  41         return (__force uint32_t) b;
  42 }
  43
  44 static inline dm_dblock_t to_dblock(dm_block_t b)
  45 {
  46         return (__force dm_dblock_t) b;
  47 }
  48
  49 static 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 */