Re: [PATCH 08/11] block: always attach cgroup info into bio

[Tejun Heo]

On Fri, Jun 02, 2017 at 02:54:01PM -0700, Shaohua Li wrote:
> @@ -691,6 +691,8 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
>  	rcu_read_lock();
>  	blkcg = bio_blkcg(bio);
>  
> +	bio_associate_blkcg(bio, &blkcg->css);
> +

Let's please note that this only established the fallback mapping when
the bio hasn't been associated yet and doesn't override the existing
association.

Thanks.

-- 
tejun