[PATCHv2 1/7] blk-mq-dma: move the bio and bvec_iter to blk_dma_iter

[Keith Busch]

On Mon, Jul 21, 2025 at 09:42:23AM +0200, Christoph Hellwig wrote:
> On Sun, Jul 20, 2025 at 11:40:34AM -0700, Keith Busch wrote:
> > From: Keith Busch <kbusch at kernel.org>
> > 
> > The req_iterator just happens to have a similar fields to what the dma
> > iterator needs, but we're not necessarily iterating a bio_vec here. Have
> > the dma iterator define its private fields directly. It also helps to
> > remove eyesores like "iter->iter.iter".
> 
> Going back to this after looking at the later patches.  The level
> for which this iter exists is only called blk_map_* as there is
> nothing dma specific about, just mapping to physical addresses.
> 
> So maybe call it blk_map_iter instead?

But the structure yields "dma_addr_t" type values to the consumer.
Whether those are physical addresses or remapped io virtual addresses,
they're still used for direct memory access, so I think the name as-is
is a pretty good fit.