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8324aa91 JA |
1 | #ifndef BLK_INTERNAL_H |
2 | #define BLK_INTERNAL_H | |
3 | ||
86db1e29 JA |
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 | ||
8324aa91 JA |
10 | extern struct kmem_cache *blk_requestq_cachep; |
11 | extern struct kobj_type blk_queue_ktype; | |
12 | ||
86db1e29 JA |
13 | void init_request_from_bio(struct request *req, struct bio *bio); |
14 | void blk_rq_bio_prep(struct request_queue *q, struct request *rq, | |
15 | struct bio *bio); | |
8324aa91 JA |
16 | void __blk_queue_free_tags(struct request_queue *q); |
17 | ||
86db1e29 JA |
18 | void blk_unplug_work(struct work_struct *work); |
19 | void blk_unplug_timeout(unsigned long data); | |
20 | ||
21 | struct io_context *current_io_context(gfp_t gfp_flags, int node); | |
22 | ||
d6d48196 JA |
23 | int ll_back_merge_fn(struct request_queue *q, struct request *req, |
24 | struct bio *bio); | |
25 | int ll_front_merge_fn(struct request_queue *q, struct request *req, | |
26 | struct bio *bio); | |
27 | int attempt_back_merge(struct request_queue *q, struct request *rq); | |
28 | int attempt_front_merge(struct request_queue *q, struct request *rq); | |
29 | void blk_recalc_rq_segments(struct request *rq); | |
30 | void blk_recalc_rq_sectors(struct request *rq, int nsect); | |
31 | ||
8324aa91 JA |
32 | void blk_queue_congestion_threshold(struct request_queue *q); |
33 | ||
ff88972c AB |
34 | int blk_dev_init(void); |
35 | ||
8324aa91 JA |
36 | /* |
37 | * Return the threshold (number of used requests) at which the queue is | |
38 | * considered to be congested. It include a little hysteresis to keep the | |
39 | * context switch rate down. | |
40 | */ | |
41 | static inline int queue_congestion_on_threshold(struct request_queue *q) | |
42 | { | |
43 | return q->nr_congestion_on; | |
44 | } | |
45 | ||
46 | /* | |
47 | * The threshold at which a queue is considered to be uncongested | |
48 | */ | |
49 | static inline int queue_congestion_off_threshold(struct request_queue *q) | |
50 | { | |
51 | return q->nr_congestion_off; | |
52 | } | |
53 | ||
54 | #endif |