code: @Override
    public int mkdir(String path, @mode_t long mode) {
      final AlluxioURI turi = mPathResolverCache.getUnchecked(path);
      LOG.trace("mkdir({}) [Alluxio: {}]", path, turi);
      try {
        mFileSystem.createDirectory(turi);
      } catch (FileAlreadyExistsException e) {
        LOG.debug("Failed to create directory {}, directory already exists", path);
        return -ErrorCodes.EEXIST();
      } catch (InvalidPathException e) {
        LOG.debug("Failed to create directory {}, path is invalid", path);
        return -ErrorCodes.ENOENT();
      } catch (Throwable t) {
        LOG.error("Failed to create directory {}", path, t);
        return AlluxioFuseUtils.getErrorCode(t);
      }
  
      return 0;
    }
docs: Creates a new dir.
  
  @param path the path on the FS of the new dir
  @param mode Dir creation flags (IGNORED)
  @return 0 on success, a negative value on error