Setting Mount Parameters in own irp

Hello!
Is there anybody knows if I can set
irpCurrentStack->Parameters.MountVolume.Vpb and
irpCurrentStack->Parameters.MountVolume.DeviceObject
in own irp.
I just want to send a mount irp to NTFS but I have a blue screen when I am
trying to set the above fields.
I can not explain myself why it happens.

Thanks!
Jack



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