• Jeff Garzik's avatar
    [libata] SCSI->ATA simulator hacking: INQUIRY command · 7f594e47
    Jeff Garzik authored
    The SCSI T10 committee is working on a document describing a standard
    method for translating ATA<->SCSI, since it being done quite often
    these days.  Some of the recommendations are reasonable, and we implement
    two here:
    
    * Mirror that ATA 'removeable media' bit into INQUIRY output.
    * Change behavior of INQUIRY output field 'product revision' from
      the libata software version number to the first 4 bytes of the
      ATA device's firmware revision number.
    
    Rather than cache the firmware revision in struct ata_device, as was/is
    done with two other strings, I took the opportunity to eliminate the
    caching of the two other strings, 'vendor' and 'product'.  These strings
    are now retrieved as needed from the IDENTIFY [PACKET] DEVICE info page,
    since we cache its entire contents.
    
    Retrieving a string from the identify-device page is done via the
    helper function ata_dev_id_string(), which is now exported.
    
    This patch winds up making struct ata_device 40 bytes smaller, and
    the libata core gets a bit smaller as well.
    7f594e47
sata_sil.c 12.5 KB