def METHOD_NAME(params):
    """
    Umount filesystems.
    :param params: Test parameters
    """
    umount_sources = [v for k, v in params.items() if k.startswith(('mount_dst'))]
    umount_sources.append(params.get("mount_dst"))
    for umount_src in umount_sources:
        process.run("umount %s" % umount_src, shell=True, ignore_status=True)
    for f in [v for k, v in params.items() if k.startswith(('mount_src_',
                                                           'mount_dst_'))]:
        if os.path.exists(f):
            os.unlink(f)