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STATUS_FLT_INVALID_NAME_REQUEST
This status says that a requested file name cannot be obtained at that time; it does not say that the path string itself is malformed. Name generation can be unavailable in particular callback contexts, and a short name cannot be obtained in the pre-create path.
Use the name-query mode that fits the callback's safety constraints. A cache-only query can avoid an unsafe file-system query, while a later filesystem-only query may be valid only where Filter Manager documents it as safe. Do not rebuild a normalized name by concatenating user-supplied path fragments, because that can lose reparse, stream, and case information.
Capture with the status
- The callback phase, IRQL-related execution constraints, and name-query flags.
- Whether the request asked for opened, normalized, or short-name information.
- Whether a cache-only miss is acceptable for this policy path.
FltGetFileNameInformation | Filter Manager name cache behavior | NTSTATUS reference
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