[PATCHv3 1/5] bvec: introduce multi-page bvec iterating
Ming Lei
ming.lei at redhat.com
Tue Nov 21 00:37:01 PST 2023
On Mon, Nov 20, 2023 at 02:40:54PM -0800, Keith Busch wrote:
> From: Keith Busch <kbusch at kernel.org>
>
> Some bio_vec iterators can handle physically contiguous memory and have
> no need to split bvec consideration on page boundaries.
Then I am wondering why this helper is needed, and you can use each bvec
directly, which is supposed to be physically contiguous.
>
> Signed-off-by: Keith Busch <kbusch at kernel.org>
> ---
> include/linux/bvec.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/bvec.h b/include/linux/bvec.h
> index 555aae5448ae4..9364c258513e0 100644
> --- a/include/linux/bvec.h
> +++ b/include/linux/bvec.h
> @@ -184,6 +184,12 @@ static inline void bvec_iter_advance_single(const struct bio_vec *bv,
> ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
> bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
>
> +#define for_each_mp_bvec(bvl, bio_vec, iter, start) \
> + for (iter = (start); \
> + (iter).bi_size && \
> + ((bvl = mp_bvec_iter_bvec((bio_vec), (iter))), 1); \
> + bvec_iter_advance_single((bio_vec), &(iter), (bvl).bv_len))
> +
We already have bio_for_each_bvec() to iterate over (multipage)bvecs
from bio.
Thanks,
Ming
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