IoRegisterFsRegistrationChange的notification routine的2个问题不确定。

NTSTATUS  IoRegisterFsRegistrationChange(    IN PDRIVER_OBJECT  DriverObject,    IN PDRIVER_FS_NOTIFICATION  DriverNotificationRoutine    ); Parameters
DriverObject
Pointer to the driver object for the file system filter driver.
DriverNotificationRoutine
Address of the routine to call when a file system registers or unregisters itself. This routine is defined as follows:
VOID
(*PDRIVER_FS_NOTIFICATION) (
    IN struct _DEVICE_OBJECT *DeviceObject,
    IN BOOLEAN FsActive
    );  registers or unregisters
一、DriverNotificationRoutine函数参数：DeviceObject，是不是文件系统 registers or unregisters 时传来的文件系统驱动的设备对像？
二、DriverNotificationRoutine函数参数：FsActive,是不是判定文件系统是否被激活？
这两参数是怎么传来的，不知道理解对不，请大牛给指点一下!

DeviceObject - Pointer to the file system's device object.

FsActive - Boolean indicating whether the file system has registered (TRUE) or unregistered (FALSE) itself as an active file system.