linux-kernel - Re: [PATCH 3/3] block/loop: make loop cgroup aware

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Message-ID: <20170908144808.GA1774378@devbig577.frc2.facebook.com>
Date:   Fri, 8 Sep 2017 07:48:09 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        lizefan@...wei.com, tglx@...utronix.de, kernel-team@...com,
        axboe@...nel.dk, Shaohua Li <shli@...com>
Subject: Re: [PATCH 3/3] block/loop: make loop cgroup aware

Hello,

On Wed, Sep 06, 2017 at 07:00:53PM -0700, Shaohua Li wrote:
> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
> index 9d4545f..9850b27 100644
> --- a/drivers/block/loop.c
> +++ b/drivers/block/loop.c
> @@ -482,6 +482,8 @@ static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2)
>  {
>  	struct loop_cmd *cmd = container_of(iocb, struct loop_cmd, iocb);
>  
> +	if (cmd->css)
> +		css_put(cmd->css);
>  	cmd->ret = ret > 0 ? 0 : ret;
>  	lo_rw_aio_do_completion(cmd);

The fact that we're forwarding explicitly in loop still bothers me a
bit.  Can you please elaborate why we don't want to do this
generically through aio?

Thanks.

-- 
tejun