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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Red Hat, Inc.
   4  *
   5  * This file is released under the GPL.
   6  */
   7
   8 #ifndef DM_CACHE_BLOCK_TYPES_H
   9 #define DM_CACHE_BLOCK_TYPES_H
  10
  11 #include "persistent-data/dm-block-manager.h"
  12
  13 /*----------------------------------------------------------------*/
  14
  15 /*
  16  * It's helpful to get sparse to differentiate between indexes into the
  17  * origin device, indexes into the cache device, and indexes into the
  18  * discard bitset.
  19  */
  20
  21 typedef dm_block_t __bitwise dm_oblock_t;
  22 typedef uint32_t __bitwise dm_cblock_t;
  23 typedef dm_block_t __bitwise dm_dblock_t;
  24
  25 static inline dm_oblock_t to_oblock(dm_block_t b)
  26 {
  27         return (__force dm_oblock_t) b;
  28 }
  29
  30 static inline dm_block_t from_oblock(dm_oblock_t b)
  31 {
  32         return (__force dm_block_t) b;
  33 }
  34
  35 static inline dm_cblock_t to_cblock(uint32_t b)
  36 {
  37         return (__force dm_cblock_t) b;
  38 }
  39
  40 static inline uint32_t from_cblock(dm_cblock_t b)
  41 {
  42         return (__force uint32_t) b;
  43 }
  44
  45 static inline dm_dblock_t to_dblock(dm_block_t b)
  46 {
  47         return (__force dm_dblock_t) b;
  48 }
  49
  50 static inline dm_block_t from_dblock(dm_dblock_t b)
  51 {
  52         return (__force dm_block_t) b;
  53 }
  54
  55 #endif /* DM_CACHE_BLOCK_TYPES_H */