linux-kernel - Re: [PATCH 1/5] io_uring: add IORING_ACCEPT

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Message-ID: <b60eb1c5-4836-5f62-315e-211a0fe03362@kernel.dk>
Date:   Fri, 6 May 2022 08:32:16 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Hao Xu <haoxu.linux@...il.com>, io-uring@...r.kernel.org
Cc:     Pavel Begunkov <asml.silence@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] io_uring: add IORING_ACCEPT_MULTISHOT for accept

On 5/6/22 1:00 AM, Hao Xu wrote:
> From: Hao Xu <howeyxu@...cent.com>
> 
> add an accept_flag IORING_ACCEPT_MULTISHOT for accept, which is to
> support multishot.
> 
> Signed-off-by: Hao Xu <howeyxu@...cent.com>
> ---
>  include/uapi/linux/io_uring.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
> index fad63564678a..73bc7e54ac18 100644
> --- a/include/uapi/linux/io_uring.h
> +++ b/include/uapi/linux/io_uring.h
> @@ -213,6 +213,11 @@ enum {
>  #define IORING_ASYNC_CANCEL_FD	(1U << 1)
>  #define IORING_ASYNC_CANCEL_ANY	(1U << 2)
>  
> +/*
> + * accept flags stored in accept_flags
> + */
> +#define IORING_ACCEPT_MULTISHOT	(1U << 15)

It isn't stored in accept_flags, is it? This is an io_uring private
flag, and it's in ioprio. Which is honestly a good place for per-op
private flags, since nobody really uses ioprio outside of read/write
style requests. But the comment is wrong :-)

-- 
Jens Axboe