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authorHeinz Mauelshagen <heinzm@redhat.com>2014-05-23 14:10:01 -0400
committerMike Snitzer <snitzer@redhat.com>2014-05-27 10:33:05 -0400
commitf1daa838e861ae1a0fb7cd9721a21258430fcc8c (patch)
treeca5bce66ef7377d04b296dc864c434b45c1c8d4d
parent80c578930ce77ba8bcfb226a184b482020bdda7b (diff)
downloadlinux-f1daa838e861ae1a0fb7cd9721a21258430fcc8c.tar.bz2
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: Heinz Mauelshagen <heinzm@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org # v3.9+
-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 9380be7b1895..5f054c44b485 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -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);