linux-kernel - Re: [RFC PATCH 3/9] ublk_drv: add a helper to get ioucmd from pdu

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Date:   Mon, 29 Aug 2022 11:06:57 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     ZiyangZhang <ZiyangZhang@...ux.alibaba.com>
Cc:     axboe@...nel.dk, xiaoguang.wang@...ux.alibaba.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, ming.lei@...hat.com
Subject: Re: [RFC PATCH 3/9] ublk_drv: add a helper to get ioucmd from pdu

On Wed, Aug 24, 2022 at 01:47:38PM +0800, ZiyangZhang wrote:
> We store pointer of task_work in pdu. And we should get ioucmd from pdu
> since we prepare to only pass ioucmd to task_work function.
> 
> Signed-off-by: ZiyangZhang <ZiyangZhang@...ux.alibaba.com>
> ---
>  drivers/block/ublk_drv.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
> index e08f636b0b9d..8add6e3ae15f 100644
> --- a/drivers/block/ublk_drv.c
> +++ b/drivers/block/ublk_drv.c
> @@ -555,6 +555,12 @@ static inline struct ublk_uring_cmd_pdu *ublk_get_uring_cmd_pdu(
>  	return (struct ublk_uring_cmd_pdu *)&ioucmd->pdu;
>  }
>  
> +static inline struct io_uring_cmd *ublk_uring_cmd_from_pdu(
> +			struct ublk_uring_cmd_pdu *pdu)
> +{
> +	return container_of((u8 *)pdu, struct io_uring_cmd, pdu[0]);
> +}
> +

Patch isn't supposed to be written in this way, it is one helper, either
change its caller in this patch, or merge this one wth the patch which
applies it.

Also looks this change belong to include/linux/io_uring.h if you think
it is useful.

thanks,
Ming