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authorHeinz Mauelshagen <heinzm@redhat.com>2014-05-23 14:10:01 -0400
committerShow Liu <show.liu@linaro.org>2014-06-18 12:05:22 +0800
commit7de8baec94172a49659d5c69180d7b34663a0a40 (patch)
tree813b70b75bf5bdad13bdcafaf43c9031b671a690
parent56634c61a9fea00cec006dd7ad39c2e382722866 (diff)
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 <heinzm@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/md/dm-cache-target.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 9306e0bcb56..c0ad90d9125 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);