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-rw-r--r--block/noop-iosched.c46
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");