Storport's Role in Transmitting SCSI Sense Data
The Storport driver is responsible for querying a device for SCSI-3 request sense data whenever a higher-level component, such as the class driver, requests it. To request sense data, the higher-level component must provide a buffer of the length specified by the SenseInfoBufferLength member of the SRB to hold the request sense data pointed to by the SenseInfoBuffer member of the SRB. Storport determines whether these two fields are defined in each SRB that it receives. If they are defined, Storport furnishes SCSI-3 request sense data whenever the target controller returns a check condition in response to the SRB.
Storport is also responsible for translating the request sense data into the appropriate SRB format before storing it in the buffer that is pointed to by SenseInfoBuffer.
When Storport completes the IRP_MJ_SCSI IRP associated with the SRB, it must indicate that it is returning request-sense information by logical-ORing the SRB_STATUS_AUTOSENSE_VALID flag in with the SrbStatus member of the SRB.