block: split tag and sysfs handling from blk-core.c
[linux-2.6.git] / 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