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block: change the tag sync vs async restriction logic

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Make them fully share the tag space, but disallow async requests using
the last any two slots.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2009-05-20 08:54:31 +02:00
parent ac36552a52
commit 0a7ae2ff0d
5 changed files with 21 additions and 13 deletions
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7
include/linux/blkdev.h
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@@ -404,7 +404,7 @@ struct request_queue
struct list_head tag_busy_list;
unsigned int nr_sorted;
unsigned int in_flight;
unsigned int in_flight[2];
unsigned int rq_timeout;
struct timer_list timeout;
@@ -511,6 +511,11 @@ static inline void queue_flag_clear_unlocked(unsigned int flag,
__clear_bit(flag, &q->queue_flags);
}
static inline int queue_in_flight(struct request_queue *q)
{
return q->in_flight[0] + q->in_flight[1];
}
static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));