Function gio_2_0_sys::g_file_measure_disk_usage_async

pub unsafe extern "C" fn g_file_measure_disk_usage_async(
    file: *mut GFile, 
    flags: GFileMeasureFlags, 
    io_priority: gint, 
    cancellable: *mut GCancellable, 
    progress_callback: Option<GFileMeasureProgressCallback>, 
    progress_data: gpointer, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)