linux-kernel - Re: [PATCH] [Bug 16494] NFS client over TCP hangs due to packet loss

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Message-Id: <20100803021110.f0b3877b.akpm@linux-foundation.org>
Date:	Tue, 3 Aug 2010 02:11:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	andyc.bluearc@...il.com, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	eric.dumazet@...il.com, William.Allen.Simpson@...il.com,
	gilad@...efidence.com, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH] [Bug 16494] NFS client over TCP hangs due to packet
 loss

(cc linux-nfs)

On Tue, 03 Aug 2010 01:21:44 -0700 (PDT) David Miller <davem@...emloft.net> wrote:

> From: "Andy Chittenden" <andyc.bluearc@...il.com>
> Date: Tue, 3 Aug 2010 09:14:31 +0100
> 
> > I don't know whether this patch is the correct fix or not but it enables the
> > NFS client to recover.
> > 
> > Kernel version: 2.6.34.1 and 2.6.32.
> > 
> > Fixes <https://bugzilla.kernel.org/show_bug.cgi?id=16494>. It clears down
> > any previous shutdown attempts so that reconnects on a socket that's been
> > shutdown leave the socket in a usable state (otherwise tcp_sendmsg() returns
> > -EPIPE).
> 
> If the SunRPC code wants to close a TCP socket then use it again,
> it should disconnect by doing a connect() with sa_family == AF_UNSPEC
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