bio_advance_iter_single
bio_advance_iter_single(src, &src_iter, bytes);
bio_advance_iter_single(dst, &dst_iter, bytes);
bio_advance_iter_single(src_bio, &src_bio->bi_iter,
bio_advance_iter_single(bio, &bio->bi_iter, bv.bv_len);
bio_advance_iter_single(bio, &iter, bv.bv_len);
bio_advance_iter_single(bio, &iter, bv.bv_len);
bio_advance_iter_single(bio, &dio->bio_details.bi_iter, ic->sectors_per_block << SECTOR_SHIFT);
bio_advance_iter_single(bio, &dio->bio_details.bi_iter, ic->sectors_per_block << SECTOR_SHIFT);
bio_advance_iter_single(bio, &dio->bio_details.bi_iter, ic->sectors_per_block << SECTOR_SHIFT);
b++, bio_advance_iter_single(bio, iter, block_size)) {
bio_advance_iter_single((bio), (iter), (blocksize)))
bio_advance_iter_single((bio), &(iter), (blocksize)))
bio_advance_iter_single((bio), &(iter), (bvl).bv_len))
bio_advance_iter_single((bio), &(iter), (bvl).bv_len))