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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Cc: [email protected]
Subject: Re: [PATCH 1/1] io_uring: fix short read retries for non-reg files
Date: Wed, 20 Jan 2021 23:50:35 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <096d4c7e2615704c08786fe793e91ad8b22cb9f9.1611184076.git.asml.silence@gmail.com>

On 20/01/2021 23:09, Pavel Begunkov wrote:
> Sockets and other non-regular files may actually expect short reads to
> happen, don't retry reads for them.

Works well with a quick test, but I think I may have missed a case,
please don't take it yet

> 
> Cc: [email protected] # 5.9+
> Suggested-by: Jens Axboe <[email protected]>
> Signed-off-by: Pavel Begunkov <[email protected]>
> ---
>  fs/io_uring.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 5f6f1e48954e..544d711b2ef0 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -3557,6 +3557,9 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
>  
>  	io_size -= ret;
>  copy_iov:
> +	if (!(req->flags & REQ_F_ISREG) && ret > 0)
> +		goto done;
> +
>  	ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
>  	if (ret2) {
>  		ret = ret2;
> 

-- 
Pavel Begunkov

      reply	other threads:[~2021-01-21  3:40 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 23:09 [PATCH 1/1] io_uring: fix short read retries for non-reg files Pavel Begunkov
2021-01-20 23:50 ` Pavel Begunkov [this message]

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