PARTS_PER_DISK
*minor = ((*minor / 64) * PARTS_PER_DISK) +
*minor = (((*minor / 64) + 2) * PARTS_PER_DISK) +
*offset = (*minor / PARTS_PER_DISK) + EMULATED_SD_DISK_NAME_OFFSET;
*offset = (*minor / PARTS_PER_DISK) +
((major - XEN_SCSI_DISK1_MAJOR + 1) * 16 * PARTS_PER_DISK) +
*offset = (*minor / PARTS_PER_DISK) +
((major - XEN_SCSI_DISK8_MAJOR + 8) * 16 * PARTS_PER_DISK) +
*offset = *minor / PARTS_PER_DISK;
nr_parts = PARTS_PER_DISK;