DASD_RAW_SECTORS_PER_TRACK
start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
DASD_RAW_SECTORS_PER_TRACK;
end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
DASD_RAW_SECTORS_PER_TRACK;
first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
DASD_RAW_SECTORS_PER_TRACK;