iter_out
ctx->iter_out = bio_out->bi_iter;
struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out);
bio_advance_iter(ctx->bio_out, &ctx->iter_out, cc->sector_size);
while (ctx->iter_in.bi_size && ctx->iter_out.bi_size) {
BUG_ON(io->ctx.iter_out.bi_size);
io->ctx.iter_out = clone->bi_iter;
struct bvec_iter iter_out;
struct iter_out out;
struct iter_out out;
struct iter_out outputs[nr_soreuse];