How do I get IRP Pointers and modify data structures in minifilter?

As far as I know, IRP is not operated directly in MiniFilter. But since I need to modify the IRP header field data, I wonder how I can get the IRP pointer in miniFilter? Thanks.

Ps. I know this is a cliche question, but It’s really urgent. Thanks.

‘Wings on a pig’ time…

What are you trying to achieve? I haven’t yet found an IdP field I haven’t been able to influence (but I haven’t tried too hard). And even if you did find the IRP your changes would likely get lost when the CBD was decanted back into the IRP by filter manager…