NTSTATUS 0xC01A001B (STATUS_LOG_SPACE_RESERVED

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the requested byte-space reservation or adjustment is invalid.

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STATUS_LOG_RECORDS_RESERVED_INVALID	STATUS_LOG_TAIL_INVALID

STATUS_LOG_SPACE_RESERVED_INVALID

STATUS_LOG_SPACE_RESERVED_INVALID concerns the amount of log space reserved, or a requested adjustment to it. In the CLFS reservation API, the actual reservation returned for a record includes required headers and alignment; it is not necessarily the same as the application payload length supplied by the caller.

This is different from STATUS_LOG_RECORDS_RESERVED_INVALID, which is about how many records are reserved. It also differs from a full-log result: a caller can mismanage reservation values even when physical containers still have capacity.

Use CLFS accounting values, not estimates

Capture the requested sizes and the actual returned reservation sizes for the same marshalling area.
Use the API-returned values when freeing or adjusting reservations, including negative values that release reserved space.
Verify whether the append call uses a prior reservation before changing container capacity or tail-management policy.

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