[PATCH] RPC: get rid of xprt->stream

 Now we can fix up the last few places that use the "xprt->stream"
 variable, and get rid of it from the rpc_xprt structure.

 Test-plan:
 Destructive testing (unplugging the network temporarily).  Connectathon
 with UDP and TCP.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/lockd/host.c

@@ -173,11 +173,10 @@ nlm_bind_host(struct nlm_host *host)
 
 	/* If we've already created an RPC client, check whether
 	 * RPC rebind is required
-	 * Note: why keep rebinding if we're on a tcp connection?
 	 */
 	if ((clnt = host->h_rpcclnt) != NULL) {
 		xprt = clnt->cl_xprt;
-		if (!xprt->stream && time_after_eq(jiffies, host->h_nextrebind)) {
+		if (time_after_eq(jiffies, host->h_nextrebind)) {
 			clnt->cl_port = 0;
 			host->h_nextrebind = jiffies + NLM_HOST_REBIND;
 			dprintk("lockd: next rebind in %ld jiffies\n",

include/linux/sunrpc/xprt.h

@@ -168,8 +168,7 @@ struct rpc_xprt {
 	unsigned long		state;		/* transport state */
 	unsigned char		shutdown   : 1,	/* being shut down */
 				nocong	   : 1,	/* no congestion control */
-				resvport   : 1, /* use a reserved port */
-				stream     : 1;	/* TCP */
+				resvport   : 1; /* use a reserved port */
 
 	/*
 	 * XID

net/sunrpc/xprt.c

@@ -630,8 +630,7 @@ void xprt_transmit(struct rpc_task *task)
 	case -ENOTCONN:
 		return;
 	default:
-		if (xprt->stream)
-			xprt_disconnect(xprt);
+		break;
 	}
 	xprt_release_write(xprt, task);
 	return;

net/sunrpc/xprtsock.c

@@ -356,6 +356,7 @@ static int xs_tcp_send_request(struct rpc_task *task)
 	default:
 		dprintk("RPC:      sendmsg returned unrecognized error %d\n",
 			-status);
+		xprt_disconnect(xprt);
 		break;
 	}
 
@@ -826,19 +827,17 @@ static void xs_tcp_write_space(struct sock *sk)
 }
 
 /**
- * xs_set_buffer_size - set send and receive limits
+ * xs_udp_set_buffer_size - set send and receive limits
  * @xprt: generic transport
  *
  * Set socket send and receive limits based on the
  * sndsize and rcvsize fields in the generic transport
- * structure. This applies only to UDP sockets.
+ * structure.
  */
-static void xs_set_buffer_size(struct rpc_xprt *xprt)
+static void xs_udp_set_buffer_size(struct rpc_xprt *xprt)
 {
 	struct sock *sk = xprt->inet;
 
-	if (xprt->stream)
-		return;
 	if (xprt->rcvsize) {
 		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
 		sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs *  2;
@@ -850,6 +849,17 @@ static void xs_set_buffer_size(struct rpc_xprt *xprt)
 	}
 }
 
+/**
+ * xs_tcp_set_buffer_size - set send and receive limits
+ * @xprt: generic transport
+ *
+ * Nothing to do for TCP.
+ */
+static void xs_tcp_set_buffer_size(struct rpc_xprt *xprt)
+{
+	return;
+}
+
 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
 {
 	struct sockaddr_in myaddr = {
@@ -928,7 +938,7 @@ static void xs_udp_connect_worker(void *args)
 
 		write_unlock_bh(&sk->sk_callback_lock);
 	}
-	xs_set_buffer_size(xprt);
+	xs_udp_set_buffer_size(xprt);
 	status = 0;
 out:
 	xprt_wake_pending_tasks(xprt, status);
@@ -1034,15 +1044,15 @@ static void xs_connect(struct rpc_task *task)
 }
 
 static struct rpc_xprt_ops xs_udp_ops = {
-	.set_buffer_size	= xs_set_buffer_size,
+	.set_buffer_size	= xs_udp_set_buffer_size,
 	.connect		= xs_connect,
 	.send_request		= xs_udp_send_request,
 	.close			= xs_close,
 	.destroy		= xs_destroy,
 };
 
 static struct rpc_xprt_ops xs_tcp_ops = {
-	.set_buffer_size	= xs_set_buffer_size,
+	.set_buffer_size	= xs_tcp_set_buffer_size,
 	.connect		= xs_connect,
 	.send_request		= xs_tcp_send_request,
 	.close			= xs_close,
@@ -1074,7 +1084,6 @@ int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
 	xprt->prot = IPPROTO_UDP;
 	xprt->port = XS_MAX_RESVPORT;
 	xprt->tsh_size = 0;
-	xprt->stream = 0;
 	xprt->nocong = 0;
 	xprt->cwnd = RPC_INITCWND;
 	xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
@@ -1115,7 +1124,6 @@ int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
 	xprt->prot = IPPROTO_TCP;
 	xprt->port = XS_MAX_RESVPORT;
 	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
-	xprt->stream = 1;
 	xprt->nocong = 1;
 	xprt->cwnd = RPC_MAXCWND(xprt);
 	xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;