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From: Jens Axboe <axboe@kernel.dk>
To: Jiufei Xue <jiufei.xue@linux.alibaba.com>, io-uring@vger.kernel.org
Cc: joseph.qi@linux.alibaba.com
Subject: Re: [PATCH] io_uring: don't set REQ_F_NOWAIT for regular files opend O_NONBLOCK
Date: Fri, 29 May 2020 08:20:01 -0600	[thread overview]
Message-ID: <df16e843-6b02-e51f-c99d-9886ead20943@kernel.dk> (raw)
In-Reply-To: <1590736708-99812-1-git-send-email-jiufei.xue@linux.alibaba.com>

On 5/29/20 1:18 AM, Jiufei Xue wrote:
> When read from a regular file that was opened O_NONBLOCK, it will
> return EAGAIN if the page is not cached, which is not expected and
> fails the application.
> 
> Applications written before expect that the open flag O_NONBLOCK has
> no effect on a regular file.
> 
> Fix this by not setting REQ_F_NOWAIT for regular files.

Agree, this also matches what we do for sockets. You need to update
the comment as well, though.

-- 
Jens Axboe


  reply	other threads:[~2020-05-29 14:20 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  7:18 [PATCH] io_uring: don't set REQ_F_NOWAIT for regular files opend O_NONBLOCK Jiufei Xue
2020-05-29 14:20 ` Jens Axboe [this message]
2020-06-01  3:26   ` Jiufei Xue
2020-06-10  6:16     ` Jiufei Xue

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