linux-kernel - [140/146] SUNRPC: Deal with the lack of a SYN_SENT sk->sk_state

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Message-Id: <20110601080504.996653806@blue.kroah.org>
Date:	Wed, 01 Jun 2011 17:01:16 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [140/146] SUNRPC: Deal with the lack of a SYN_SENT sk->sk_state_change

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------
 callback...

From: Trond Myklebust <Trond.Myklebust@...app.com>

commit fe19a96b10032035a35779f42ad59e35d6dd8ffd upstream.

The TCP connection state code depends on the state_change() callback
being called when the SYN_SENT state is set. However the networking layer
doesn't actually call us back in that case.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/sunrpc/xprtsock.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1344,7 +1344,6 @@ static void xs_tcp_state_change(struct s
 	case TCP_CLOSE_WAIT:
 		/* The server initiated a shutdown of the socket */
 		xprt_force_disconnect(xprt);
-	case TCP_SYN_SENT:
 		xprt->connect_cookie++;
 	case TCP_CLOSING:
 		/*
@@ -1758,6 +1757,7 @@ static void xs_tcp_reuse_connection(stru
 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
 {
 	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	int ret = -ENOTCONN;
 
 	if (!transport->inet) {
 		struct sock *sk = sock->sk;
@@ -1789,12 +1789,22 @@ static int xs_tcp_finish_connecting(stru
 	}
 
 	if (!xprt_bound(xprt))
-		return -ENOTCONN;
+		goto out;
 
 	/* Tell the socket layer to start connecting... */
 	xprt->stat.connect_count++;
 	xprt->stat.connect_start = jiffies;
-	return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+	ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+	switch (ret) {
+	case 0:
+	case -EINPROGRESS:
+		/* SYN_SENT! */
+		xprt->connect_cookie++;
+		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+	}
+out:
+	return ret;
 }
 
 /**


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