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
  23 static inline dm_oblock_t to_oblock(dm_block_t b)
  24 {
  25         return (__force dm_oblock_t) b;
  26 }
  27
  28 static inline dm_block_t from_oblock(dm_oblock_t b)
  29 {
  30         return (__force dm_block_t) b;
  31 }
  32
  33 static inline dm_cblock_t to_cblock(uint32_t b)
  34 {
  35         return (__force dm_cblock_t) b;
  36 }
  37
  38 static inline uint32_t from_cblock(dm_cblock_t b)
  39 {
  40         return (__force uint32_t) b;
  41 }
  42
  43 #endif /* DM_CACHE_BLOCK_TYPES_H */