linux-kernel - Re: [PATCH v2 1/6] locks: fix unlock when fcntl

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Message-ID: <20160108162604.GD3989@fieldses.org>
Date:	Fri, 8 Jan 2016 11:26:04 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeff Layton <jlayton@...chiereds.net>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2 1/6] locks: fix unlock when fcntl_setlk races with a
 close

On Fri, Jan 08, 2016 at 11:22:04AM -0500, J. Bruce Fields wrote:
> On Fri, Jan 08, 2016 at 11:21:01AM -0500, J. Bruce Fields wrote:
> > Yeah.  I almost think an OK iterim solution would be just to document
> > the race in the appropriate man page and tell people that if they really
> > want to use posix locks in an application with lots of threads sharing
> > file descriptors then they should consider OFD locks.
> 
> (Especially if this race has always existed.)

Oh but note I'm only talking about this additional race that you've
identified.

I agree that the problem addressed by these patches need fixing, and
gave them a quick read and they look OK to me--feel free to add my ACK.

--b.