#include <ntddk.h>
#include "ntifs.h"

VOID
FileDiskUnload (
    IN PDRIVER_OBJECT DriverObject
    )
{
    PDEVICE_OBJECT device_object;

    PAGED_CODE();

    device_object = DriverObject->DeviceObject;

    while (device_object)
    {
        device_object = FileDiskDeleteDevice(device_object);
    }
	//如果存在device_object，則調用FileDiskDeleteDevice刪除設備device_object

    ZwClose(dir_handle);
}