get_checksum_crc
crc = get_checksum_crc(seg_hash, seg_limit);
crc = get_checksum_crc(seg_hash, (trailer_offset - segment_offset));
crc = get_checksum_crc(seg_hash, (trailer_offset -
crc = get_checksum_crc(seg_hash, (seg_hash->u.seg_obj->trailer_offset -
crc = get_checksum_crc(seg_hash, seg_limit);