block/blk.h

   1 #ifndef BLK_INTERNAL_H
   2 #define BLK_INTERNAL_H
   3
   4 extern struct kmem_cache *blk_requestq_cachep;
   5 extern struct kobj_type blk_queue_ktype;
   6
   7 void __blk_queue_free_tags(struct request_queue *q);
   8
   9 void blk_queue_congestion_threshold(struct request_queue *q);
  10
  11 /*
  12  * Return the threshold (number of used requests) at which the queue is
  13  * considered to be congested.  It include a little hysteresis to keep the
  14  * context switch rate down.
  15  */
  16 static inline int queue_congestion_on_threshold(struct request_queue *q)
  17 {
  18         return q->nr_congestion_on;
  19 }
  20
  21 /*
  22  * The threshold at which a queue is considered to be uncongested
  23  */
  24 static inline int queue_congestion_off_threshold(struct request_queue *q)
  25 {
  26         return q->nr_congestion_off;
  27 }
  28
  29 #endif