On Tue, Sep 06, 2022 at 12:10:54AM -0700, John Hubbard wrote: > I would be delighted if that were somehow possible. Every time I think > it's possible, it has fallen apart. The fact that bio_release_pages() > will need to switch over from put_page() to unpin_user_page(), combined > with the fact that there are a lot of callers that submit bios, has > led me to the current approach. We can (temporarily) pass the gup flag to bio_release_pages or even better add a new bio_unpin_pages helper that undoes the pin side. That is: don't try to reuse the old APIs, but ad new ones, just like we do on the lower layers.
