[PATCH v2 04/12] block: prohibit calls to bio_chain_endio

[Stephen Zhang]

Andreas Gruenbacher <agruenba at redhat.com> 于2025年11月28日周五 20:58写道：
>
> On Fri, Nov 28, 2025 at 9:33 AM zhangshida <starzhangzsd at gmail.com> wrote:
> > From: Shida Zhang <zhangshida at kylinos.cn>
> >
> > Now that all potential callers of bio_chain_endio have been
> > eliminated, completely prohibit any future calls to this function.
> >
> > Suggested-by: Ming Lei <ming.lei at redhat.com>
> > Suggested-by: Andreas Gruenbacher <agruenba at redhat.com>
> > Suggested-by: Christoph Hellwig <hch at infradead.org>
> > Signed-off-by: Shida Zhang <zhangshida at kylinos.cn>
> > ---
> >  block/bio.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/block/bio.c b/block/bio.c
> > index aa43435c15f..2473a2c0d2f 100644
> > --- a/block/bio.c
> > +++ b/block/bio.c
> > @@ -323,8 +323,13 @@ static struct bio *__bio_chain_endio(struct bio *bio)
> >         return parent;
> >  }
> >
> > +/**
> > + * This function should only be used as a flag and must never be called.
> > + * If execution reaches here, it indicates a serious programming error.
> > + */
> >  static void bio_chain_endio(struct bio *bio)
> >  {
> > +       BUG_ON(1);
>
> The below call is dead code and should be removed. With that, nothing
> remains of the first patch in this queue ("block: fix incorrect logic
> in bio_chain_endio") and that patch can be dropped.

Yeah, that makes it much clearer. I will do that.

Thanks,
Shida

>
> >         bio_endio(bio);
> >  }
> >
> > --
> > 2.34.1
> >
>
> Thanks,
> Andreas
>