linux-kernel - Re: [PATCH AUTOSEL 4.9 20/87] fs: Make splice() and tee() take into account O

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Date:   Thu, 28 Mar 2019 15:37:49 +0000
From:   Slavomir Kaslev <kaslevs@...are.com>
To:     "sashal@...nel.org" <sashal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>
CC:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 4.9 20/87] fs: Make splice() and tee() take into
 account O_NONBLOCK flag on pipes

On Wed, 2019-03-27 at 14:19 -0400, Sasha Levin wrote:
> From: Slavomir Kaslev <kaslevs@...are.com>
> 
> [ Upstream commit ee5e001196d1345b8fee25925ff5f1d67936081e ]
> 
> The current implementation of splice() and tee() ignores O_NONBLOCK
> set
> on pipe file descriptors and checks only the SPLICE_F_NONBLOCK flag
> for
> blocking on pipe arguments.  This is inconsistent since splice()-ing
> from/to non-pipe file descriptors does take O_NONBLOCK into
> consideration.
> 
> Fix this by promoting O_NONBLOCK, when set on a pipe, to
> SPLICE_F_NONBLOCK.

Hey Sasha,

I don't think that this patch should be merged to stable kernels. It's
more of a feature rather than a bug/regression fix and it changes how
splice() has been working from day one.

Can you please drop it from the stable queues?

Thanks,

-- Slavi