Re: [RFC V4 3/6] blk-iolatency: make iolatency pluggable

[Christoph Hellwig]

> +static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
> +{
> +	return rq_qos_by_id(q, blkcg_iolatency_ops.id);
> +}

This just has a single user, so open code it.

> +static int blk_iolatency_init(struct request_queue *q);
> +
>  static struct rq_qos_ops blkcg_iolatency_ops = {
> +	.name = "blk-iolat",
> +	.flags = RQOS_FLAG_CGRP_POL,
>  	.throttle = blkcg_iolatency_throttle,
>  	.done_bio = blkcg_iolatency_done_bio,
>  	.exit = blkcg_iolatency_exit,
> +	.init = blk_iolatency_init,
>  };

I'd move this structure below blk_iolatency_init to avoid the forward
declaration of blk_iolatency_init