{
    return "" unless scalar keys %$vfs;

    my $vfs_module_prefix_map = {
       shadow_copy2 => 'shadow',
       posix_eadb   => 'posix'
    };

    $OUT = "vfs objects = " . (join " ", keys %$vfs) . "\n";
    foreach $mod (keys %$vfs) {
	$mod2 = $vfs_module_prefix_map->{$mod} || $mod;
	foreach $opt (keys %{$vfs->{$mod}}) {
	    $OUT .= "  $mod2:$opt=$vfs->{$mod}->{$opt}\n";
	}
    }
}
