What does NTSTATUS 0x001C0001 (STATUS_FLT_IO_COMPLETE) mean?

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Description:

a lower minifilter completed an asynchronously issued I/O request before it reached the file system

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DBG_CONTINUE	STATUS_RTPM_CONTEXT_CONTINUE

STATUS_FLT_IO_COMPLETE

STATUS_FLT_IO_COMPLETE is a Filter Manager completion result, not a generic I/O failure. It tells the initiating minifilter that a lower instance completed the request in its pre-operation callback, so the request did not continue to the base file system.

This matters with FltPerformAsynchronousIo. The initiating filter must inspect the completed callback data and its IoStatus; it must not assume that a normal file-system completion or a matching post-operation path will follow. A lower filter may have completed the request for its own policy or redirection reason.

What to record

The initiating instance, the lower minifilter instances, and the requested major operation.
The final IoStatus.Status and information field, rather than this framework result alone.
Whether the lower filter intentionally completed the operation and whether retrying would repeat the same policy decision.

FltPerformAsynchronousIo | Filter Manager callback order | NTSTATUS reference

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