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Commit f1daa838 authored by Heinz Mauelshagen's avatar Heinz Mauelshagen Committed by Mike Snitzer
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dm cache: always split discards on cache block boundaries 



The DM cache target cannot cope with discards that span multiple cache
blocks, so each discard bio that spans more than one cache block must
get split by the DM core.

Signed-off-by: default avatarHeinz Mauelshagen <heinzm@redhat.com>
Acked-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.9+
parent 80c57893

drivers/md/dm-cache-target.c

+2 −0
Original line number Diff line number Diff line
@@ -2178,6 +2178,8 @@ static int cache_create(struct cache_args *ca, struct cache **result) 
	ti->num_discard_bios = 1;

	ti->discards_supported = true;

	ti->discard_zeroes_data_unsupported = true;

	/* Discard bios must be split on a block boundary */

	ti->split_discard_bios = true;



	cache->features = ca->features;

	ti->per_bio_data_size = get_per_bio_data_size(cache);