https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdfio/nc-wdfio-evt_wdf_io_queue_io_write
EVT_WDF_IO_QUEUE_IO_WRITE (wdfio.h) - Windows drivers | Microsoft Learn
A driver's EvtIoWrite event callback function processes a specified write request.
windows driversevtwdfioqueue