+static int nfs_do_mount_v4(struct nfsmount_info *mi,
+ struct sockaddr *sap, socklen_t salen)
+{
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
+
+ if (!options) {
+ errno = ENOMEM;
+ return result;
+ }
+
+ if (mi->version == 0) {
+ if (po_contains(options, "mounthost") ||
+ po_contains(options, "mountaddr") ||
+ po_contains(options, "mountvers") ||
+ po_contains(options, "mountproto")) {
+ /*
+ * Since these mountd options are set assume version 3
+ * is wanted so error out with EPROTONOSUPPORT so the
+ * protocol negation starts with v3.
+ */
+ errno = EPROTONOSUPPORT;
+ goto out_fail;
+ }
+ if (po_append(options, "vers=4") == PO_FAILED) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ }
+
+ if (!nfs_append_addr_option(sap, salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ if (!nfs_append_clientaddr_option(sap, salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ /*
+ * Update option string to be recorded in /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;