Re: [PATCH RFC 0/4] iomap: zero range folio batch processing prototype

[Christoph Hellwig <hch@infradead.org>]

On Tue, Nov 19, 2024 at 10:46:52AM -0500, Brian Foster wrote:
> I thought about using ->private along with a custom ->get_folio(), but I
> don't think that really fits the idea of a built-in mechanism. It might
> be more appropriate to attach to the iter, but that currently isn't
> accessible to ->iomap_begin(). I suppose we could define an
> iomap_to_iter() or some such helper that the fill helper could use to
> populate the batch, but maybe there are other thoughts/ideas?

The iter is the right place, and you can get at it using
container_of as already done by btrfs (and osme of my upcoming code):

	struct iomap_iter *iter = container_of(iomap, struct iomap_iter, iomap);