[PATCH] nvme-multipath: introduce service-time iopolicy

[Keith Busch]

On Wed, Nov 06, 2024 at 06:34:10PM +0800, Guixin Liu wrote:
> +	if (READ_ONCE(ns->head->subsys->iopolicy) == NVME_IOPOLICY_ST) {
> +		atomic_add(blk_rq_bytes(rq), &ns->ctrl->inflight_size);
> +		nvme_req(rq)->flags |= NVME_MPATH_CNT_IOSIZE;
> +	}

...

>  static inline struct nvme_request *nvme_req(struct request *req)
> @@ -367,6 +368,7 @@ struct nvme_ctrl {
>  	struct timer_list anatt_timer;
>  	struct work_struct ana_work;
>  	atomic_t nr_active;
> +	atomic_t inflight_size;

You're counting bytes, so this should probably be an atomic64_t.