From: Heinz Mauelshagen Date: Fri, 23 May 2014 18:10:01 +0000 (-0400) Subject: dm cache: always split discards on cache block boundaries X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=04937d94156d63d7f6249416b82ac810f0218219;p=karo-tx-linux.git dm cache: always split discards on cache block boundaries commit f1daa838e861ae1a0fb7cd9721a21258430fcc8c upstream. 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: Heinz Mauelshagen Acked-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 9306e0bcb564..c0ad90d91252 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -2195,6 +2195,8 @@ 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);