• Alan Stern's avatar
    SCSI & usb-storage: add flags for VPD pages and REPORT LUNS · 09b6b51b
    Alan Stern authored
    This patch (as1507) adds a skip_vpd_pages flag to struct scsi_device
    and a no_report_luns flag to struct scsi_target.  The first is used to
    control whether sd will look at VPD pages for information on block
    provisioning, limits, and characteristics.  The second prevents
    scsi_report_lun_scan() from issuing a REPORT LUNS command.
    The patch also modifies usb-storage to set the new flag bits for all
    USB devices and targets, and to stop adjusting the scsi_level value.
    Historically we have seen that USB mass-storage devices often don't
    support VPD pages or REPORT LUNS properly.  Until now we have avoided
    these things by setting the scsi_level to SCSI_2 for all USB devices.
    But this has the side effect of storing the LUN bits into the second
    byte of each CDB, and now we have a report of a device which doesn't
    like that.  The best solution is to stop abusing scsi_level and
    instead have separate flags for VPD pages and REPORT LUNS.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Reported-by: default avatarPerry Wagle <wagle@mac.com>
    CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
    Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
sd.c 75.9 KB