diff --git a/block/blk-merge.c b/block/blk-merge.c
index 3b0cd4249671d9826b42ea10473a11486c403368..eafc94f68d79f2ceb1c0a89fce8e449c3a5ff3f6 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -361,6 +361,18 @@ static int attempt_merge(struct request_queue *q, struct request *req,
 	if (!rq_mergeable(req) || !rq_mergeable(next))
 		return 0;
 
+	/*
+	 * Don't merge file system requests and discard requests
+	 */
+	if ((req->cmd_flags & REQ_DISCARD) != (next->cmd_flags & REQ_DISCARD))
+		return 0;
+
+	/*
+	 * Don't merge discard requests and secure discard requests
+	 */
+	if ((req->cmd_flags & REQ_SECURE) != (next->cmd_flags & REQ_SECURE))
+		return 0;
+
 	/*
 	 * not contiguous
 	 */