linux-kernel - Re: [PATCH 5/5] io_uring: implement multishot mode for accept

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Message-ID: <3b302e60-cb5a-a193-db13-5ca0ef5603cc@kernel.dk>
Date:   Fri, 6 May 2022 14:50:49 -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 5/5] io_uring: implement multishot mode for accept

On 5/6/22 1:01 AM, Hao Xu wrote:
> @@ -5748,8 +5758,12 @@ static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
>  		if (!fixed)
>  			put_unused_fd(fd);
>  		ret = PTR_ERR(file);
> -		if (ret == -EAGAIN && force_nonblock)
> -			return -EAGAIN;
> +		if (ret == -EAGAIN && force_nonblock) {
> +			if ((req->flags & REQ_F_APOLL_MULTI_POLLED) ==
> +			    REQ_F_APOLL_MULTI_POLLED)
> +				ret = 0;
> +			return ret;

FWIW, this

	if ((req->flags & REQ_F_APOLL_MULTI_POLLED) == REQ_F_APOLL_MULTI_POLLED)

is identical to

	if (req->flags & REQ_F_APOLL_MULTI_POLLED)

but I suspect this used to check more flags (??), because as it stands
it seems a bit nonsensical.

-- 
Jens Axboe