126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
#ifndef BLK_INTERNAL_H
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#define BLK_INTERNAL_H
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/* Amount of time in which a process may batch requests */
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#define BLK_BATCH_TIME (HZ/50UL)
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/* Number of requests a "batching" process may submit */
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#define BLK_BATCH_REQ 32
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extern struct kmem_cache *blk_requestq_cachep;
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extern struct kobj_type blk_queue_ktype;
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void init_request_from_bio(struct request *req, struct bio *bio);
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void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
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struct bio *bio);
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void __blk_queue_free_tags(struct request_queue *q);
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void blk_unplug_work(struct work_struct *work);
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void blk_unplug_timeout(unsigned long data);
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void blk_rq_timed_out_timer(unsigned long data);
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void blk_delete_timer(struct request *);
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void blk_add_timer(struct request *);
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void __generic_unplug_device(struct request_queue *);
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/*
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* Internal atomic flags for request handling
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*/
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enum rq_atomic_flags {
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REQ_ATOM_COMPLETE = 0,
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};
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/*
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* EH timer and IO completion will both attempt to 'grab' the request, make
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* sure that only one of them suceeds
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*/
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static inline int blk_mark_rq_complete(struct request *rq)
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{
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return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
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}
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static inline void blk_clear_rq_complete(struct request *rq)
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{
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clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
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}
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#ifdef CONFIG_FAIL_IO_TIMEOUT
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int blk_should_fake_timeout(struct request_queue *);
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ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
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ssize_t part_timeout_store(struct device *, struct device_attribute *,
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const char *, size_t);
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#else
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static inline int blk_should_fake_timeout(struct request_queue *q)
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{
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return 0;
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}
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#endif
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struct io_context *current_io_context(gfp_t gfp_flags, int node);
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int ll_back_merge_fn(struct request_queue *q, struct request *req,
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struct bio *bio);
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int ll_front_merge_fn(struct request_queue *q, struct request *req,
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struct bio *bio);
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int attempt_back_merge(struct request_queue *q, struct request *rq);
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int attempt_front_merge(struct request_queue *q, struct request *rq);
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void blk_recalc_rq_segments(struct request *rq);
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void blk_recalc_rq_sectors(struct request *rq, int nsect);
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void blk_queue_congestion_threshold(struct request_queue *q);
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int blk_dev_init(void);
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void elv_quiesce_start(struct request_queue *q);
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void elv_quiesce_end(struct request_queue *q);
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/*
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* Return the threshold (number of used requests) at which the queue is
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* considered to be congested. It include a little hysteresis to keep the
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* context switch rate down.
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*/
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static inline int queue_congestion_on_threshold(struct request_queue *q)
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{
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return q->nr_congestion_on;
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}
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/*
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* The threshold at which a queue is considered to be uncongested
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*/
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static inline int queue_congestion_off_threshold(struct request_queue *q)
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{
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return q->nr_congestion_off;
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}
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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#define rq_for_each_integrity_segment(bvl, _rq, _iter) \
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__rq_for_each_bio(_iter.bio, _rq) \
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bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i)
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#endif /* BLK_DEV_INTEGRITY */
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static inline int blk_cpu_to_group(int cpu)
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{
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#ifdef CONFIG_SCHED_MC
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const struct cpumask *mask = cpu_coregroup_mask(cpu);
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return cpumask_first(mask);
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#elif defined(CONFIG_SCHED_SMT)
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return cpumask_first(topology_thread_cpumask(cpu));
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#else
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return cpu;
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#endif
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}
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static inline int blk_do_io_stat(struct request *rq)
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{
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struct gendisk *disk = rq->rq_disk;
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if (!disk || !disk->queue)
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return 0;
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return blk_queue_io_stat(disk->queue) && (rq->cmd_flags & REQ_ELVPRIV);
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}
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#endif
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