HRESULT 0x801F0001 (ERROR_FLT_NO_HANDLER

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Description:

the minifilter registered no callback handler for the requested operation.

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WER_E_TOO_HEAVY	ERROR_FLT_CONTEXT_ALREADY_DEFINED

ERROR_FLT_NO_HANDLER_DEFINED

The operation is outside the registered callback contract

ERROR_FLT_NO_HANDLER_DEFINED indicates that Filter Manager was asked to process an operation for which the relevant minifilter supplied no callback definition. A minifilter opts into operation types through the terminated FLT_OPERATION_REGISTRATION array passed in FLT_REGISTRATION; unregistered major functions are not generic extension points.

This status is most useful when code constructs or reissues callback data itself. It points to a mismatch between the operation’s MajorFunction and the filter’s registration, not to a missing filesystem dispatch routine. Adding a callback merely to suppress the error is unsafe unless the filter can honor that operation’s parameter layout and completion rules.

Registration checks

Log the major and minor function from the callback data that could not be dispatched.
Confirm that the operation appears exactly once in the registration array before the IRP_MJ_OPERATION_END sentinel.
Check whether the initiating code allocated callback data for an operation the filter never intended to issue.
Review pre-operation and post-operation pairing requirements before adding a new handler.

References

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