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dm cache: discard block size must be a multiple of cache block size

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Otherwise the cache blocks may span two discard blocks, which we don't
handle when doing the discard lookup.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2014-11-26 16:07:50 +00:00 committed by Mike Snitzer
parent 43c32bf2b0
commit 2bb812df63
1 changed files with 3 additions and 6 deletions
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9
drivers/md/dm-cache-target.c
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@ -2275,9 +2275,8 @@ static int create_cache_policy(struct cache *cache, struct cache_args *ca,
}
/*
* We want the discard block size to be a power of two, at least the size
* of the cache block size, and have no more than 2^14 discard blocks
* across the origin.
* We want the discard block size to be at least the size of the cache
* block size and have no more than 2^14 discard blocks across the origin.
*/
#define MAX_DISCARD_BLOCKS (1 << 14)
@ -2292,9 +2291,7 @@ static bool too_many_discard_blocks(sector_t discard_block_size,
static sector_t calculate_discard_block_size(sector_t cache_block_size,
sector_t origin_size)
{
sector_t discard_block_size;
discard_block_size = roundup_pow_of_two(cache_block_size);
sector_t discard_block_size = cache_block_size;
if (origin_size)
while (too_many_discard_blocks(discard_block_size, origin_size))