What does Windows error code 762 (ERROR_FSFILTER_OP_COMPLETED_SUCCESSFULLY) mean?

ERROR_FSFILTER_OP_COMPLETED_SUCCESSFULLY

a file-system or file-system-filter operation has already completed successfully.

ERROR_FSFILTER_OP_COMPLETED_SUCCESSFULLY identifies 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.

What 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.

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.

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.

References

• Microsoft: System error codes 500–999