mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
#ifndef BLK_INTERNAL_H
|
|
#define BLK_INTERNAL_H
|
|
|
|
/* Amount of time in which a process may batch requests */
|
|
#define BLK_BATCH_TIME (HZ/50UL)
|
|
|
|
/* Number of requests a "batching" process may submit */
|
|
#define BLK_BATCH_REQ 32
|
|
|
|
extern struct kmem_cache *blk_requestq_cachep;
|
|
extern struct kobj_type blk_queue_ktype;
|
|
|
|
void rq_init(struct request_queue *q, struct request *rq);
|
|
void init_request_from_bio(struct request *req, struct bio *bio);
|
|
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
|
|
struct bio *bio);
|
|
void __blk_queue_free_tags(struct request_queue *q);
|
|
|
|
void blk_unplug_work(struct work_struct *work);
|
|
void blk_unplug_timeout(unsigned long data);
|
|
|
|
struct io_context *current_io_context(gfp_t gfp_flags, int node);
|
|
|
|
int ll_back_merge_fn(struct request_queue *q, struct request *req,
|
|
struct bio *bio);
|
|
int ll_front_merge_fn(struct request_queue *q, struct request *req,
|
|
struct bio *bio);
|
|
int attempt_back_merge(struct request_queue *q, struct request *rq);
|
|
int attempt_front_merge(struct request_queue *q, struct request *rq);
|
|
void blk_recalc_rq_segments(struct request *rq);
|
|
void blk_recalc_rq_sectors(struct request *rq, int nsect);
|
|
|
|
void blk_queue_congestion_threshold(struct request_queue *q);
|
|
|
|
/*
|
|
* Return the threshold (number of used requests) at which the queue is
|
|
* considered to be congested. It include a little hysteresis to keep the
|
|
* context switch rate down.
|
|
*/
|
|
static inline int queue_congestion_on_threshold(struct request_queue *q)
|
|
{
|
|
return q->nr_congestion_on;
|
|
}
|
|
|
|
/*
|
|
* The threshold at which a queue is considered to be uncongested
|
|
*/
|
|
static inline int queue_congestion_off_threshold(struct request_queue *q)
|
|
{
|
|
return q->nr_congestion_off;
|
|
}
|
|
|
|
#endif
|