netdev - [PATCH] [Bug 16494] NFS client over TCP hangs due to packet loss

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Date:	Tue, 3 Aug 2010 09:14:31 +0100
From:	"Andy Chittenden" <andyc.bluearc@...il.com>
To:	"'David S. Miller'" <davem@...emloft.net>,
	"'Alexey Kuznetsov'" <kuznet@....inr.ac.ru>,
	"'Pekka Savola \(ipv6'" <pekkas@...core.fi>,
	"'James Morris'" <jmorris@...ei.org>,
	"'Hideaki YOSHIFUJI'" <yoshfuji@...ux-ipv6.org>,
	"'Patrick McHardy'" <kaber@...sh.net>,
	"'Eric Dumazet'" <eric.dumazet@...il.com>,
	<William.Allen.Simpson@...il.com>,
	"'Gilad Ben-Yossef'" <gilad@...efidence.com>,
	'Ilpo Järvinen' <ilpo.jarvinen@...sinki.fi>,
	<netdev@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Cc:	<akpm@...ux-foundation.org>
Subject: [PATCH] [Bug 16494] NFS client over TCP hangs due to packet loss

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).

# diff -up /home/company/software/src/linux-2.6.34.1/net/ipv4/tcp_output.c
net/ipv4
--- /home/company/software/src/linux-2.6.34.1/net/ipv4/tcp_output.c
2010-07-27 08:46:46.917000000 +0100
+++ net/ipv4/tcp_output.c       2010-07-27 09:19:16.000000000 +0100
@@ -2522,6 +2522,13 @@ static void tcp_connect_init(struct sock
        struct tcp_sock *tp = tcp_sk(sk);
        __u8 rcv_wscale;

+       /* clear 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).
+        */
+       sk->sk_shutdown = 0;
+
        /* We'll fix this up when we get a response from the other end.
         * See tcp_input.c:tcp_rcv_state_process case TCP_SYN_SENT.
         */

Signed-off-by: Andy Chittenden <andyc.bluearc@...il.com>



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