121 lines
3.3 KiB
C
121 lines
3.3 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 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);
|
|
void blk_rq_timed_out_timer(unsigned long data);
|
|
void blk_delete_timer(struct request *);
|
|
void blk_add_timer(struct request *);
|
|
void __generic_unplug_device(struct request_queue *);
|
|
|
|
/*
|
|
* Internal atomic flags for request handling
|
|
*/
|
|
enum rq_atomic_flags {
|
|
REQ_ATOM_COMPLETE = 0,
|
|
};
|
|
|
|
/*
|
|
* EH timer and IO completion will both attempt to 'grab' the request, make
|
|
* sure that only one of them suceeds
|
|
*/
|
|
static inline int blk_mark_rq_complete(struct request *rq)
|
|
{
|
|
return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
|
|
}
|
|
|
|
static inline void blk_clear_rq_complete(struct request *rq)
|
|
{
|
|
clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
|
|
}
|
|
|
|
#ifdef CONFIG_FAIL_IO_TIMEOUT
|
|
int blk_should_fake_timeout(struct request_queue *);
|
|
ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
|
|
ssize_t part_timeout_store(struct device *, struct device_attribute *,
|
|
const char *, size_t);
|
|
#else
|
|
static inline int blk_should_fake_timeout(struct request_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
|
|
int blk_dev_init(void);
|
|
|
|
void elv_quiesce_start(struct request_queue *q);
|
|
void elv_quiesce_end(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;
|
|
}
|
|
|
|
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
|
|
|
#define rq_for_each_integrity_segment(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i)
|
|
|
|
#endif /* BLK_DEV_INTEGRITY */
|
|
|
|
static inline int blk_cpu_to_group(int cpu)
|
|
{
|
|
#ifdef CONFIG_SCHED_MC
|
|
const struct cpumask *mask = cpu_coregroup_mask(cpu);
|
|
return cpumask_first(mask);
|
|
#elif defined(CONFIG_SCHED_SMT)
|
|
return cpumask_first(topology_thread_cpumask(cpu));
|
|
#else
|
|
return cpu;
|
|
#endif
|
|
}
|
|
|
|
static inline int blk_do_io_stat(struct request *rq)
|
|
{
|
|
return rq->rq_disk && blk_rq_io_stat(rq);
|
|
}
|
|
|
|
#endif
|