linux-kernel - Re: [RFC PATCH] fs: use a sequence counter instead of file_lock in fd

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Message-ID: <1429548505.7346.263.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 20 Apr 2015 09:48:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mateusz Guzik <mguzik@...hat.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] fs: use a sequence counter instead of file_lock in
 fd_install

On Mon, 2015-04-20 at 09:46 -0700, Eric Dumazet wrote:

> 
> Hey, that's because I really meant (during the week end)

old = xchg(&fdt->fd[fd], file);
if (unlikely(old && old != file))
	filp_close(old, files);

That's going to be hard.

If you thought this problem was trivial, it probably means you missed
something.



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