1 #ifndef BLK_INTERNAL_H
2 #define BLK_INTERNAL_H
3
4 /* Amount of time in which a process may batch requests */
5 #define BLK_BATCH_TIME (HZ/50UL)
6
7 /* Number of requests a "batching" process may submit */
8 #define BLK_BATCH_REQ 32
9
10 extern struct kmem_cache *blk_requestq_cachep;
11 extern struct kobj_type blk_queue_ktype;
12
13 void rq_init(struct request_queue *q, struct request *rq);
14 void init_request_from_bio(struct request *req, struct bio *bio);
15 void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
16 struct bio *bio);
17 void __blk_queue_free_tags(struct request_queue *q);
18
19 void blk_unplug_work(struct work_struct *work);
20 void blk_unplug_timeout(unsigned long data);
21
22 struct io_context *current_io_context(gfp_t gfp_flags, int node);
23
24 int ll_back_merge_fn(struct request_queue *q, struct request *req,
25 struct bio *bio);
26 int ll_front_merge_fn(struct request_queue *q, struct request *req,
27 struct bio *bio);
28 int attempt_back_merge(struct request_queue *q, struct request *rq);
29 int attempt_front_merge(struct request_queue *q, struct request *rq);
30 void blk_recalc_rq_segments(struct request *rq);
31 void blk_recalc_rq_sectors(struct request *rq, int nsect);
32
33 void blk_queue_congestion_threshold(struct request_queue *q);
34
35 int blk_dev_init(void);
36
37 /*
38 * Return the threshold (number of used requests) at which the queue is
39 * considered to be congested. It include a little hysteresis to keep the
40 * context switch rate down.
41 */
42 static inline int queue_congestion_on_threshold(struct request_queue *q)
43 {
44 return q->nr_congestion_on;
45 }
46
47 /*
48 * The threshold at which a queue is considered to be uncongested
49 */
50 static inline int queue_congestion_off_threshold(struct request_queue *q)
51 {
52 return q->nr_congestion_off;
53 }
54
55 #endif
56
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