[Devel] [PATCH hci-8.1 5/7] drivers/md/dm-qcow2: implement per-qio fast processing

[Konstantin Khorenko]

I won't apply this version, please send v2 with the changes below.

On Thu, 29 Oct 2026 17:03:44 +0300, Andrey Zhadchenko wrote:
> +static void qio_try_fast(struct qio *qio, struct list_head *deferred_qios)
> +{
> +	list_del(&qio->link);
> +
> +	if (process_one_qio(qio->qcow2, qio, true))
> +		list_add(&qio->link, deferred_qios);
> +}

Items 1 and 7 of the cover letter reply.

This patch is where the race of item 1 becomes live: from here on
process_one_qio() runs in parallel with do_qcow2_work(), and a write
can reach perform_rw_mapped() after the main kwork switched its L2 page
to writeback. The details are in the reply to patch 2.

Sashiko's list_add() remark holds, please use list_add_tail() or say
why the reversed order is fine.

-- 
Konstantin Khorenko,
Virtuozzo Linux Kernel Team