1 files changed, 46 insertions, 0 deletions
diff --git a/block/noop-iosched.c b/block/noop-iosched.c
new file mode 100644
index 0000000..e54f006
--- /dev/null
+++ b/block/noop-iosched.c
@@ -0,0 +1,46 @@
+/*
+ * elevator noop
+ */
+#include <linux/blkdev.h>
+#include <linux/elevator.h>
+#include <linux/bio.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+static void elevator_noop_add_request(request_queue_t *q, struct request *rq)
+{
+	rq->flags |= REQ_NOMERGE;
+	elv_dispatch_add_tail(q, rq);
+}
+
+static int elevator_noop_dispatch(request_queue_t *q, int force)
+{
+	return 0;
+}
+
+static struct elevator_type elevator_noop = {
+	.ops = {
+		.elevator_dispatch_fn		= elevator_noop_dispatch,
+		.elevator_add_req_fn		= elevator_noop_add_request,
+	},
+	.elevator_name = "noop",
+	.elevator_owner = THIS_MODULE,
+};
+
+static int __init noop_init(void)
+{
+	return elv_register(&elevator_noop);
+}
+
+static void __exit noop_exit(void)
+{
+	elv_unregister(&elevator_noop);
+}
+
+module_init(noop_init);
+module_exit(noop_exit);
+
+
+MODULE_AUTHOR("Jens Axboe");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("No-op IO scheduler");