BLKDEV_DEFAULT_RQ
q->nr_requests = BLKDEV_DEFAULT_RQ;
q->async_depth = BLKDEV_DEFAULT_RQ;
#define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
return 2 * min_t(unsigned int, set->queue_depth, BLKDEV_DEFAULT_RQ);
#define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_DEFAULT_RQ