commit 196cfe2ae8fcdc03b3c7d627e7dfe8c0ce7229f9
Author: Stefan Bader <stefan.bader@canonical.com>
Date:   Thu Jul 14 15:30:22 2011 +0200

    xen-blkfront: Drop name and minor adjustments for emulated scsi devices

    These were intended to avoid the namespace clash when representing
    emulated IDE and SCSI devices. However that seems to confuse users
    more than expected (a disk defined as sda becomes xvde).
    So for now go back to the scheme which does no adjustments. This
    will break when mixing IDE and SCSI names in the configuration of
    guests but should be by now expected.

    Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

--- linux-2.6.39.noarch/drivers/block/xen-blkfront.c~	2011-08-11 11:54:25.656150889 -0400
+++ linux-2.6.39.noarch/drivers/block/xen-blkfront.c	2011-08-11 11:54:54.573046334 -0400
@@ -123,8 +123,8 @@ static DEFINE_SPINLOCK(minor_lock);
 #define BLKIF_MINOR_EXT(dev) ((dev)&(~EXTENDED))
 #define EMULATED_HD_DISK_MINOR_OFFSET (0)
 #define EMULATED_HD_DISK_NAME_OFFSET (EMULATED_HD_DISK_MINOR_OFFSET / 256)
-#define EMULATED_SD_DISK_MINOR_OFFSET (EMULATED_HD_DISK_MINOR_OFFSET + (4 * 16))
-#define EMULATED_SD_DISK_NAME_OFFSET (EMULATED_HD_DISK_NAME_OFFSET + 4)
+#define EMULATED_SD_DISK_MINOR_OFFSET (0)
+#define EMULATED_SD_DISK_NAME_OFFSET (EMULATED_SD_DISK_MINOR_OFFSET / 256)
 
 #define DEV_NAME	"xvd"	/* name in /dev */