SUNRPC: Ensure that we handle ENOBUFS errors correctly.

Currently, an ENOBUFS error will result in a fatal error for the RPC
call. Normally, we will just want to wait and then retry.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

net/sunrpc/xprtsock.c

@@ -594,6 +594,7 @@ static int xs_local_send_request(struct rpc_task *task)
 	}
 
 	switch (status) {
+	case -ENOBUFS:
 	case -EAGAIN:
 		status = xs_nospace(task);
 		break;
@@ -661,6 +662,7 @@ static int xs_udp_send_request(struct rpc_task *task)
 		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 			-status);
 	case -ENETUNREACH:
+	case -ENOBUFS:
 	case -EPIPE:
 	case -ECONNREFUSED:
 		/* When the server has died, an ICMP port unreachable message
@@ -758,6 +760,7 @@ static int xs_tcp_send_request(struct rpc_task *task)
 		status = -ENOTCONN;
 		/* Should we call xs_close() here? */
 		break;
+	case -ENOBUFS:
 	case -EAGAIN:
 		status = xs_nospace(task);
 		break;
@@ -1946,6 +1949,7 @@ static int xs_local_setup_socket(struct sock_xprt *transport)
 		dprintk("RPC:       xprt %p connected to %s\n",
 				xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
 		xprt_set_connected(xprt);
+	case -ENOBUFS:
 		break;
 	case -ENOENT:
 		dprintk("RPC:       xprt %p: socket %s does not exist\n",
@@ -2281,6 +2285,7 @@ static void xs_tcp_setup_socket(struct work_struct *work)
 	case -ECONNREFUSED:
 	case -ECONNRESET:
 	case -ENETUNREACH:
+	case -ENOBUFS:
 		/* retry with existing socket, after a delay */
 		goto out;
 	}