return err
	}

	if n != len(buf) {
		return io.ErrShortWrite
	}

	return nil
}

// checkPart is a light check of an existing and size of a part, without doing a bitrot operation
// For any unexpected error, return checkPartUnknown (zero)
func (s *xlStorage) checkPart(volumeDir, path, dataDir string, partNum int, expectedSize int64, skipAccessCheck bool) (resp int) {