drivers/block/noop-iosched.c

   1 /*
   2  * elevator noop
   3  */
   4 #include <linux/blkdev.h>
   5 #include <linux/elevator.h>
   6 #include <linux/bio.h>
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9
  10 static void elevator_noop_add_request(request_queue_t *q, struct request *rq)
  11 {
  12         elv_dispatch_add_tail(q, rq);
  13 }
  14
  15 static int elevator_noop_dispatch(request_queue_t *q, int force)
  16 {
  17         return 0;
  18 }
  19
  20 static struct elevator_type elevator_noop = {
  21         .ops = {
  22                 .elevator_dispatch_fn           = elevator_noop_dispatch,
  23                 .elevator_add_req_fn            = elevator_noop_add_request,
  24         },
  25         .elevator_name = "noop",
  26         .elevator_owner = THIS_MODULE,
  27 };
  28
  29 static int __init noop_init(void)
  30 {
  31         return elv_register(&elevator_noop);
  32 }
  33
  34 static void __exit noop_exit(void)
  35 {
  36         elv_unregister(&elevator_noop);
  37 }
  38
  39 module_init(noop_init);
  40 module_exit(noop_exit);
  41
  42
  43 MODULE_AUTHOR("Jens Axboe");
  44 MODULE_LICENSE("GPL");
  45 MODULE_DESCRIPTION("No-op IO scheduler");