Re: [PATCH v9 6/8] block: Switch to pinning pages.

[Christoph Hellwig]

On Tue, Jan 24, 2023 at 05:01:06PM +0000, David Howells wrote:
> Add BIO_PAGE_PINNED to indicate that the pages in a bio are pinned
> (FOLL_PIN) and that the pin will need removing.

The subject is odd when this doesn't actually switch anything,
but just adds the infrastructure to unpin pages.

> +/*
> + * Set the cleanup mode for a bio from an iterator and the extraction flags.
> + */
> +static inline void bio_set_cleanup_mode(struct bio *bio, struct iov_iter *iter)
> +{
> +	if (iov_iter_extract_will_pin(iter))
> +		bio_set_flag(bio, BIO_PAGE_PINNED);
> +}

At this point I'd be tempted to just open code these two lines
instead of adding a helper, but I can live with the helper if you
prefer it.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>