Root/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
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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