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IRP_MJ_POWER and File System Minifilter Driver

ChandrakanttChandrakantt Member Posts: 3

I want to capture power events from my file system minifilter driver. I implemented dispatch functions for IRP_MJ_POWER. But found that it is never called.
I think, it is not getting IRP_MJ_POWER event, as it is minifilter driver which does not need to handle power IRP. Please correct if I am wrong.
Is there any way to receive IRP_MJ_POWER in file system minifilter driver?


  • Don_BurnDon_Burn Member - All Emails Posts: 1,760

    The first question is what are you really trying to accomplish? IRP_MJ_POWER is mainly about the physical device which has little to do with a file system. Have you looked at ExRegisterCallback with \Callback\PowerState to see if that provides what you want?

  • ChandrakanttChandrakantt Member Posts: 3
    edited November 2021

    Thanks Don, I am trying to get SYSTEM_POWER_STATE_CONTEXT(for startup type) which comes in IRP_MN_SET_POWER.
    I looked at ExRegisterCallback with \Callback\PowerState but it does not gives this information.

    Post edited by Chandrakantt on
  • ChandrakanttChandrakantt Member Posts: 3

    ExRegisterCallback with \Callback\PowerState gives event when it goes to sleep state and few other details. But I require machine started from hibernation or fast startup.

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