+ if (mi->fake)
+ return 1;
+
+ if (nfs_sys_mount(mi, "nfs", *extra_opts))
+ return 1;
+
+ /*
+ * The kernel returns EOPNOTSUPP if the RPC bind failed,
+ * and EPROTONOSUPPORT if the version isn't supported.
+ */
+ if (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT)
+ return 0;
+
+ return nfs_retry_nfs23mount(mi);
+}
+
+/*
+ * Attempt an NFS v4 mount via a mount(2) system call.
+ *
+ * Returns 1 if successful. Otherwise, returns zero.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_nfs4mount(struct nfsmount_info *mi)
+{
+ char **extra_opts = mi->extra_opts;
+
+ if (po_join(mi->options, extra_opts) == PO_FAILED) {
+ errno = EIO;
+ return 0;
+ }
+
+ if (verbose)
+ printf(_("%s: text-based options: '%s'\n"),
+ progname, *extra_opts);
+
+ if (mi->fake)
+ return 1;
+
+ return nfs_sys_mount(mi, "nfs4", *extra_opts);
+}
+
+/*
+ * Perform either an NFSv2/3 mount, or an NFSv4 mount system call.
+ *
+ * Returns 1 if successful. Otherwise, returns zero.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_mount(struct nfsmount_info *mi)
+{
+ if (strncmp(mi->type, "nfs4", 4) == 0)
+ return nfs_try_nfs4mount(mi);
+ else
+ return nfs_try_nfs23mount(mi);
+}
+
+/*
+ * Handle "foreground" NFS mounts.
+ *
+ * Retry the mount request for as long as the 'retry=' option says.
+ *
+ * Returns a valid mount command exit code.
+ */
+static int nfsmount_fg(struct nfsmount_info *mi)
+{
+ unsigned int secs = 1;
+ time_t timeout;
+
+ timeout = nfs_parse_retry_option(mi->options,
+ NFS_DEF_FG_TIMEOUT_MINUTES);
+ if (verbose)
+ printf(_("%s: timeout set for %s"),
+ progname, ctime(&timeout));
+
+ for (;;) {
+ if (nfs_try_mount(mi))
+ return EX_SUCCESS;
+
+ if (is_permanent_error(errno))
+ break;
+
+ if (time(NULL) > timeout) {
+ errno = ETIMEDOUT;
+ break;