How to Handle Requests that the Frameworks Do Not Support
Neither UMDF nor KMDF supports every possible type of I/O request. For example, the frameworks do not support file-system requests such as IRP_MJ_FILE_SYSTEM_CONTROL. Instead, the frameworks support the I/O request types that drivers most commonly receive.
Chapter 8 provides a complete list of supported request types.
Default Handling of Unsupported Requests
UMDF and KMDF differ in their default handling of unsupported requests.
For a UMDF driver, when the reflector receives an IRP of an unsupported type, it passes the IRP down to the next-lower driver in the kernel-mode device stack. UMDF drivers do not have access to requests that the framework does not support.
When KMDF receives a request ...
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