def METHOD_NAME(test, params, env):
    """
    Blockdev incremental backup test
    test steps:
        1. boot VM with one or two data disks
        2. make filesystem in data disks
        3. create file and save it md5sum in data disks
        4. add target disks for backup to VM via qmp commands
        5. do full backup
        6. create new files and save it md5sum in data disks
        7. do incremental backup with bitmap-mode option
        8. check bitmap count
        9. compare overlay image and source image(optional)
    :param test: test object
    :param params: test configuration dict
    :param env: env object
    """
    inc_test = BlockdevIncreamentalBackupBitmapTest(test, params, env)
    inc_test.run_test()