Handling SRB_FUNCTION_IO_CONTROL
Whether a miniport driver handles SRB_FUNCTION_IO_CONTROL requests depends on whether the HBA is to provide dedicated support for a user-mode application. Supporting this request allows a set of driver-defined ("private") I/O control requests to be sent directly to the miniport driver. For SRBs with the Function member set to SRB_FUNCTION_IO_CONTROL, the DataBuffer member contains a pointer to a system-defined SRB_IO_CONTROL structure containing the driver-defined and application-specified ControlCode.
All system-defined, required device I/O control requests sent to NT-based operating system storage class drivers are mapped to SRBs with the Function member set to SRB_FUNCTION_EXECUTE_SCSI, not to SRB_FUNCTION_IO_CONTROL.
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