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From: Andy Chittenden on 3 Aug 2010 04:20
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(a)gmail.com>



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