linux-kernel - Re: [PATCH AUTOSEL 5.0 59/66] fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock

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Message-ID: <CAHk-=wjEOyba5As1PEMk6RitNVOJH9oJ_Jbg4y=5B0fcX1iKGw@mail.gmail.com>
Date:   Wed, 24 Apr 2019 09:40:53 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sasha Levin <sashal@...nel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Kirill Smelkov <kirr@...edi.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Yongzhi Pan <panyongzhi@...il.com>,
        Jonathan Corbet <corbet@....net>,
        David Vrabel <david.vrabel@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Miklos Szeredi <miklos@...redi.hu>, Tejun Heo <tj@...nel.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Arnd Bergmann <arnd@...db.de>, Christoph Hellwig <hch@....de>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Nikolaus Rath <Nikolaus@...h.org>,
        Han-Wen Nienhuys <hanwen@...gle.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.0 59/66] fs: stream_open - opener for
 stream-like files so that read and write can run simultaneously without deadlock

On Wed, Apr 24, 2019 at 9:34 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> I think there is a follow-on patch for this one as well, that adds the
> proper "stream open" logic to all of the individual locations.

That bulk one hasn't been applied yet, and wouldn't be appropriate for
stable anyway. It's 5.2 material.

But...

> But even with that, I don't think this is stable material, it should
> just be for 5.1 and newer kernels.

We likely *will* have a fuse-only patch that uses stream_open() and
_will_ be marked for stable, but that hasn't actually happened yet
either. But if/when that happens, then this infrastructure patch will
indeed be needed in stable.

                  Linus