alistair23-linux/drivers/md/dm-cache-block-types.h
Heinz Mauelshagen 64ab346a36 dm cache: remove remainder of distinct discard block size
Discard block size not being equal to cache block size causes data
corruption by erroneously avoiding migrations in issue_copy() because
the discard state is being cleared for a group of cache blocks when it
should not.

Completely remove all code that enabled a distinction between the
cache block size and discard block size.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2014-03-27 16:56:23 -04:00

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907 B
C

/*
* Copyright (C) 2012 Red Hat, Inc.
*
* This file is released under the GPL.
*/
#ifndef DM_CACHE_BLOCK_TYPES_H
#define DM_CACHE_BLOCK_TYPES_H
#include "persistent-data/dm-block-manager.h"
/*----------------------------------------------------------------*/
/*
* It's helpful to get sparse to differentiate between indexes into the
* origin device, indexes into the cache device, and indexes into the
* discard bitset.
*/
typedef dm_block_t __bitwise__ dm_oblock_t;
typedef uint32_t __bitwise__ dm_cblock_t;
static inline dm_oblock_t to_oblock(dm_block_t b)
{
return (__force dm_oblock_t) b;
}
static inline dm_block_t from_oblock(dm_oblock_t b)
{
return (__force dm_block_t) b;
}
static inline dm_cblock_t to_cblock(uint32_t b)
{
return (__force dm_cblock_t) b;
}
static inline uint32_t from_cblock(dm_cblock_t b)
{
return (__force uint32_t) b;
}
#endif /* DM_CACHE_BLOCK_TYPES_H */