cdrom: don't check CDC_PLAY_AUDIO in cdrom_count_tracks()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / block / blk.h
blobc79f30e1df52d8388c6c89505e97756f2f906098
1 #ifndef BLK_INTERNAL_H
2 #define BLK_INTERNAL_H
4 /* Amount of time in which a process may batch requests */
5 #define BLK_BATCH_TIME (HZ/50UL)
7 /* Number of requests a "batching" process may submit */
8 #define BLK_BATCH_REQ 32
10 extern struct kmem_cache *blk_requestq_cachep;
11 extern struct kobj_type blk_queue_ktype;
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);
16 void __blk_queue_free_tags(struct request_queue *q);
18 void blk_unplug_work(struct work_struct *work);
19 void blk_unplug_timeout(unsigned long data);
21 struct io_context *current_io_context(gfp_t gfp_flags, int node);
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);
32 void blk_queue_congestion_threshold(struct request_queue *q);
34 int blk_dev_init(void);
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.
41 static inline int queue_congestion_on_threshold(struct request_queue *q)
43 return q->nr_congestion_on;
47 * The threshold at which a queue is considered to be uncongested
49 static inline int queue_congestion_off_threshold(struct request_queue *q)
51 return q->nr_congestion_off;
54 #if defined(CONFIG_BLK_DEV_INTEGRITY)
56 #define rq_for_each_integrity_segment(bvl, _rq, _iter) \
57 __rq_for_each_bio(_iter.bio, _rq) \
58 bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i)
60 #endif /* BLK_DEV_INTEGRITY */
62 #endif