Re: [PATCHv3 2/7] blk-mq-dma: provide the bio_vec list being iterated

[Keith Busch <kbusch@xxxxxxxxxx>]

On Tue, Jul 29, 2025 at 07:34:37AM -0700, Keith Busch wrote:
> @@ -244,8 +244,10 @@ int __blk_rq_map_sg(struct request *rq, struct scatterlist *sglist,
>  	int nsegs = 0;
>  
>  	/* the internal flush request may not have bio attached */
> -	if (bio)
> +	if (bio) {
>  		iter.iter = bio->bi_iter;
> +		iter.bvec = bio->bi_io_vec;

Oops, this should have been:

		if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
			iter.bvec = &rq->special_vec;
		else
			iter.bvec = bio->bi_io_vec;

Hopefully over time everything coverts to the dma iterator and this
legacy sg mapping can fade away.

> +	}