file_check_directory should create directories recursively

There should be 4th bool argument for allowing recursive directory creation, which should be passed for mkdir() as 2nd argument

function file_check_directory(&$directory, $mode = 0, $form_item = NULL) {
  $directory = rtrim($directory, '/\\');

  // Check if directory exists.
  if (!is_dir($directory)) {
    if (($mode & FILE_CREATE_DIRECTORY) && @mkdir($directory)) {
      drupal_chmod($directory);
    }
...

http://uk3.php.net/mkdir