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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Date:   Wed, 24 Apr 2019 10:26:55 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.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 10:19 AM Sasha Levin <sashal@...nel.org> wrote:
>
> Hm, I might be confusing something here but I see a bunch of patches
> that convert existing callers mentioned in this patch to use
> stream_open() which was introduced here.

The only use of stream_open() upstream right now is the xenbus
conversion, and that isn't actually a bugfix, because xenbus used to
manually do that

        filp->f_mode &= ~FMODE_ATOMIC_POS; /* cdev-style semantics */

that stream_open() does.

So no, there isn't "a bunch of patches" anywhere.

There are *future* cleanups for 5.2 that will happen, and that might
have hit linux-next. And there is at least one FUSE patch (again -
pending, not upstream) that may get marked for stable.

But I see nothing right now that makes it stable material yet.

                Linus