[dm-devel] [PATCH v2 07/12] dm zero: silently drop discards too

[Mike Snitzer]

Have the zero target silently drop a discard rather than fail the
request with -EOPNOTSUPP.

Signed-off-by: Mike Snitzer <snitzer at redhat.com>
---
 drivers/md/dm-zero.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c
index bbc9703..8bd76e0 100644
--- a/drivers/md/dm-zero.c
+++ b/drivers/md/dm-zero.c
@@ -22,6 +22,9 @@ static int zero_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		return -EINVAL;
 	}
 
+	/* silently drop discards (this avoids -EOPNOTSUPP) */
+	ti->num_discard_requests = 1;
+
 	return 0;
 }
 
-- 
1.6.6.1