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

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Message-ID: <20170612184904.GL19206@htj.duckdns.org>
Date:   Mon, 12 Jun 2017 14:49:04 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        gregkh@...uxfoundation.org, hch@....de, axboe@...com,
        rostedt@...dmis.org, lizefan@...wei.com, Kernel-team@...com,
        Shaohua Li <shli@...com>
Subject: Re: [PATCH 08/11] block: always attach cgroup info into bio

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