On Mon, Feb 08, 2021 at 03:18:27PM -0700, Jens Axboe wrote:
> + rcu_read_lock();
> + xas_for_each(&xas, head, max) {
> + if (xas_retry(&xas, head))
> + continue;
> + if (xa_is_value(head))
> + continue;
> + page = find_subpage(head, xas.xa_index);
> + if (PageDirty(page) || PageLocked(page) || PageWriteback(page))
> + break;
> + page = NULL;
> + }
> + rcu_read_unlock();
There's no need to find the sub-page for any of these three conditions --
the bit will be set on the head page.
