Writing I/O Completion Routines
An I/O Completion routine is an I/O Manager callback that notifies a higher-level driver when the lower-level driver has finished work on an IRP. This section explains how to use I/O Completion routines in intermediate drivers.
Requesting an I/O Completion Callback
To regain control of an IRP after it has been processed by a lower-level driver, use IoSetCompletionRoutine (described in Table 15.1). This function puts the address of an I/O Completion routine in the IRP stack location associated with the next lower driver. When some lower-level driver calls IoCompleteRequest, the I/O Completion routine executes as the IRP bubbles its way back to the top of the driver hierarchy.
Except for the driver on the bottom, ...
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