NFSv4: Allow user to set the port used by the NFSv4 callback channel

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 30cae36..fcd97406 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -34,6 +34,7 @@
 static DECLARE_MUTEX(nfs_callback_sema);
 static struct svc_program nfs4_callback_program;
 
+unsigned int nfs_callback_set_tcpport;
 unsigned short nfs_callback_tcpport;
 
 /*
@@ -98,7 +99,7 @@
 	if (!serv)
 		goto out_err;
 	/* FIXME: We don't want to register this socket with the portmapper */
-	ret = svc_makesock(serv, IPPROTO_TCP, 0);
+	ret = svc_makesock(serv, IPPROTO_TCP, nfs_callback_set_tcpport);
 	if (ret < 0)
 		goto out_destroy;
 	if (!list_empty(&serv->sv_permsocks)) {