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ERROR_FSFILTER_OP_COMPLETED_SUCCESSFULLY
a file-system or file-system-filter operation has already completed successfully.
ERROR_FSFILTER_OP_COMPLETED_SUCCESSFULLY identifies the condition that this condition The file-system filter framework can use this result to indicate that a callback or helper completed the requested operation and that normal downstream processing should not repeat it.
Where the result appears
- file-system minifilters and legacy filters.
- pre-operation callbacks that satisfy an I/O request.
- metadata or name-provider operations.
- diagnostic traces around short-circuited I/O paths.
How to interpret the result
Interpret the numeric value in the Win32/LRESULT domain and in the context of the API that returned it. Preserve this result before wrappers convert it to an HRESULT, exception, Boolean failure, or provider-specific message. When recording it, note whether the operation produced usable output; this determines whether the value is completion information, control flow, or a terminal failure.
Diagnostic evidence to collect
- major and minor IRP function.
- file object, volume, and filter altitude.
- completion status and information field.
- whether a completion callback was requested or skipped.
A diagnostic record for it should contain the API name, input flags, relevant handles or object identifiers, thread and process identity, timestamp, and the immediately preceding state transition. Those fields are more useful than a generic screenshot because they show which contract and lifecycle phase produced the value.
Handling and recovery
Honor the completion contract and do not send the operation down the stack again. Filter code should set all required output fields before returning and should test both the completed and pass-through paths.
Retry after this result only when an external state relevant to this operation can actually change. When it is rooted in object state, unsupported capability, ownership, or invalid sequencing, an unchanged retry repeats the defect and can obscure the first useful diagnostic record.
Common misinterpretation
Successful completion by a filter is different from merely allowing the request to continue. Treating both paths identically can cause duplicate I/O or double completion.
Guidance for developers
Keep the original it value and its Win32 domain in structured telemetry. If it crosses COM or another HRESULT-based boundary, store both the source Win32 value and the converted result. If it crosses JSON, RPC, or a database boundary, include error_domain, error_code, operation, and object_state so the receiver does not apply a second conversion.
An automated test should construct the specific state that leads to it, assert the exact returned value, and verify cleanup on both the normal and exceptional path. The result test should additionally prove that the caller does not collapse this status into an unrelated generic error and does not retry forever.
References
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