SUNRPC: fix bug in patch "portmapper doesn't need a reserved port"

 The in-kernel portmapper does in fact need a reserved port when registering
 new services, but not when performing bind queries.

 Ensure that we distinguish between the two cases.

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

net/sunrpc/pmap_clnt.c

@@ -26,7 +26,7 @@
 #define PMAP_GETPORT		3
 
 static struct rpc_procinfo	pmap_procedures[];
-static struct rpc_clnt *	pmap_create(char *, struct sockaddr_in *, int);
+static struct rpc_clnt *	pmap_create(char *, struct sockaddr_in *, int, int);
 static void			pmap_getport_done(struct rpc_task *);
 static struct rpc_program	pmap_program;
 static DEFINE_SPINLOCK(pmap_lock);
@@ -65,7 +65,7 @@ rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
 	map->pm_binding = 1;
 	spin_unlock(&pmap_lock);
 
-	pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot);
+	pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot, 0);
 	if (IS_ERR(pmap_clnt)) {
 		task->tk_status = PTR_ERR(pmap_clnt);
 		goto bailout;
@@ -112,7 +112,7 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
 			NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
 
 	sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
-	pmap_clnt = pmap_create(hostname, sin, prot);
+	pmap_clnt = pmap_create(hostname, sin, prot, 0);
 	if (IS_ERR(pmap_clnt))
 		return PTR_ERR(pmap_clnt);
 
@@ -171,7 +171,7 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 
 	sin.sin_family = AF_INET;
 	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
-	pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP);
+	pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP, 1);
 	if (IS_ERR(pmap_clnt)) {
 		error = PTR_ERR(pmap_clnt);
 		dprintk("RPC: couldn't create pmap client. Error = %d\n", error);
@@ -198,7 +198,7 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 }
 
 static struct rpc_clnt *
-pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
+pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged)
 {
 	struct rpc_xprt	*xprt;
 	struct rpc_clnt	*clnt;
@@ -208,7 +208,8 @@ pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
 	if (IS_ERR(xprt))
 		return (struct rpc_clnt *)xprt;
 	xprt->addr.sin_port = htons(RPC_PMAP_PORT);
-	xprt->resvport = 0;
+	if (!privileged)
+		xprt->resvport = 0;
 
 	/* printk("pmap: create clnt\n"); */
 	clnt = rpc_new_client(xprt, hostname,