3.2.5.2.5 Processing a Server Close Drive Request Message
This message is processed according to the rules defined in section 3.1.5.1. If there are any pending or incomplete I/O requests with this FileId that are about to be closed, those requests are canceled. That is, they are completed with an NTSTATUS code STATUS_CANCELLED (0xC0000120) value for the IoStatus field in the response.