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Message-ID: <4c611091.487e0e0a.39f4.372b@mx.google.com>
Date: Tue, 10 Aug 2010 09:40:46 +0100
From: "Andy Chittenden" <andyc.bluearc@...il.com>
To: "'Trond Myklebust'" <Trond.Myklebust@...app.com>
Cc: "'Andrew Morton'" <akpm@...ux-foundation.org>,
"'David Miller'" <davem@...emloft.net>, <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>,
"'J. Bruce Fields'" <bfields@...ldses.org>,
"'Neil Brown'" <neilb@...e.de>,
"'Chuck Lever'" <chuck.lever@...cle.com>,
"'Benny Halevy'" <bhalevy@...asas.com>,
"'Alexandros Batsakis'" <batsakis@...app.com>,
"'Joe Perches'" <joe@...ches.com>,
"Andy Chittenden" <andyc@...earc.com>
Subject: RE: [PATCH] [Bug 16494] NFS client over TCP hangs due to packet loss
> On Mon, 2010-08-09 at 10:27 +0100, Andy Chittenden wrote:
> > A weekend run with that patch applied to 2.6.34.2 was successful. As
> nobody has objected, what's the next step to getting it applied to the
> official source trees?
>
> Please resend me a version with a cleaned up changelog entry. I can
> then
> push it as a bugfix.
>
> Cheers
> Trond
Thanks. I think this sums it up:
SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494)
When reusing a TCP connection, ensure that it's aborted if a previous shutdown attempt has been made on that connection so that the RPC over TCP recovery mechanism succeeds.
# diff -up /home/company/software/src/linux-2.6.34.2/net/sunrpc/xprtsock.c net/sunrpc/xprtsock.c
--- /home/company/software/src/linux-2.6.34.2/net/sunrpc/xprtsock.c 2010-08-02 18:30:51.000000000 +0100
+++ net/sunrpc/xprtsock.c 2010-08-06 08:09:08.000000000 +0100
@@ -1322,10 +1322,11 @@ static void xs_tcp_state_change(struct s
if (!(xprt = xprt_from_sock(sk)))
goto out;
dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
- dprintk("RPC: state %x conn %d dead %d zapped %d\n",
+ dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
sk->sk_state, xprt_connected(xprt),
sock_flag(sk, SOCK_DEAD),
- sock_flag(sk, SOCK_ZAPPED));
+ sock_flag(sk, SOCK_ZAPPED),
+ sk->sk_shutdown);
switch (sk->sk_state) {
case TCP_ESTABLISHED:
@@ -1796,10 +1797,25 @@ static void xs_tcp_reuse_connection(stru
{
unsigned int state = transport->inet->sk_state;
- if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
- return;
- if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
- return;
+ if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
+ /* we don't need to abort the connection if the socket
+ * hasn't undergone a shutdown
+ */
+ if (transport->inet->sk_shutdown == 0)
+ return;
+ dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
+ __func__, transport->inet->sk_shutdown);
+ }
+ if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
+ /* we don't need to abort the connection if the socket
+ * hasn't undergone a shutdown
+ */
+ if (transport->inet->sk_shutdown == 0)
+ return;
+ dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
+ "sk_shutdown set to %d\n",
+ __func__, transport->inet->sk_shutdown);
+ }
xs_abort_connection(xprt, transport);
}
Signed-off-by: Andy Chittenden <andyc.bluearc@...il.com>
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