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Receipt of this request indicates that the last handle of the file object that is associated with the target device object has been closed and released. All outstanding I/O requests have been completed or canceled.
Many device and intermediate drivers merely set STATUS_SUCCESS in the I/O status block of the IRP and complete the close request. However, what a given driver does on receipt of a close request depends on the driver's design. In general, a driver should undo whatever actions it takes on receipt of the IRP_MJ_CREATE request. Device drivers whose device objects are exclusive, such as a serial driver, also can reset the hardware on receipt of a close request.
The IRP_MJ_CLOSE request is not necessarily sent in the context of the process that closed the file object handle. If the driver must release process-specific resources, such as user memory, that the driver previously locked or mapped, it must do so in response to an IRP_MJ_CLEANUP request.
The IRP_MJ_CLOSE request will always be sent at PASSIVE_LEVEL.