blk.h (bf61c8840efe60fd8f91446860b63338fb424158) blk.h (320ae51feed5c2f13664aa05a76bec198967e04d)
1#ifndef BLK_INTERNAL_H
2#define BLK_INTERNAL_H
3
4#include <linux/idr.h>
5
6/* Amount of time in which a process may batch requests */
7#define BLK_BATCH_TIME (HZ/50UL)
8
9/* Number of requests a "batching" process may submit */
10#define BLK_BATCH_REQ 32
11
12extern struct kmem_cache *blk_requestq_cachep;
1#ifndef BLK_INTERNAL_H
2#define BLK_INTERNAL_H
3
4#include <linux/idr.h>
5
6/* Amount of time in which a process may batch requests */
7#define BLK_BATCH_TIME (HZ/50UL)
8
9/* Number of requests a "batching" process may submit */
10#define BLK_BATCH_REQ 32
11
12extern struct kmem_cache *blk_requestq_cachep;
13extern struct kmem_cache *request_cachep;
13extern struct kobj_type blk_queue_ktype;
14extern struct ida blk_queue_ida;
15
16static inline void __blk_get_queue(struct request_queue *q)
17{
18 kobject_get(&q->kobj);
19}
20

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29void blk_queue_bypass_start(struct request_queue *q);
30void blk_queue_bypass_end(struct request_queue *q);
31void blk_dequeue_request(struct request *rq);
32void __blk_queue_free_tags(struct request_queue *q);
33bool __blk_end_bidi_request(struct request *rq, int error,
34 unsigned int nr_bytes, unsigned int bidi_bytes);
35
36void blk_rq_timed_out_timer(unsigned long data);
14extern struct kobj_type blk_queue_ktype;
15extern struct ida blk_queue_ida;
16
17static inline void __blk_get_queue(struct request_queue *q)
18{
19 kobject_get(&q->kobj);
20}
21

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30void blk_queue_bypass_start(struct request_queue *q);
31void blk_queue_bypass_end(struct request_queue *q);
32void blk_dequeue_request(struct request *rq);
33void __blk_queue_free_tags(struct request_queue *q);
34bool __blk_end_bidi_request(struct request *rq, int error,
35 unsigned int nr_bytes, unsigned int bidi_bytes);
36
37void blk_rq_timed_out_timer(unsigned long data);
38void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
39 unsigned int *next_set);
40void __blk_add_timer(struct request *req, struct list_head *timeout_list);
37void blk_delete_timer(struct request *);
38void blk_add_timer(struct request *);
39
41void blk_delete_timer(struct request *);
42void blk_add_timer(struct request *);
43
44
45bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
46 struct bio *bio);
47bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
48 struct bio *bio);
49bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
50 unsigned int *request_count);
51
52void blk_account_io_start(struct request *req, bool new_io);
53void blk_account_io_completion(struct request *req, unsigned int bytes);
54void blk_account_io_done(struct request *req);
55
40/*
41 * Internal atomic flags for request handling
42 */
43enum rq_atomic_flags {
44 REQ_ATOM_COMPLETE = 0,
56/*
57 * Internal atomic flags for request handling
58 */
59enum rq_atomic_flags {
60 REQ_ATOM_COMPLETE = 0,
61 REQ_ATOM_STARTED,
45};
46
47/*
48 * EH timer and IO completion will both attempt to 'grab' the request, make
49 * sure that only one of them succeeds
50 */
51static inline int blk_mark_rq_complete(struct request *rq)
52{

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63
64/*
65 * EH timer and IO completion will both attempt to 'grab' the request, make
66 * sure that only one of them succeeds
67 */
68static inline int blk_mark_rq_complete(struct request *rq)
69{

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