choose_data_offset
choose_data_offset(r10_bio, rdev);
choose_data_offset(r10_bio, rdev));
dev_start + choose_data_offset(r10_bio, rdev),
dev_start + choose_data_offset(r10_bio, rrdev),
choose_data_offset(r10_bio,
choose_data_offset(r10_bio, rdev)),
choose_data_offset(r10_bio, rdev)),
choose_data_offset(r10_bio, rdev);