On 2019-07-12, Al Viro <viro@zeniv.linux.org.uk> wrote:
> On Sun, Jul 07, 2019 at 12:57:31AM +1000, Aleksa Sarai wrote:
> > Previously, path_init's handling of *at(dfd, ...) was only done once,
> > but with LOOKUP_BENEATH (and LOOKUP_IN_ROOT) we have to parse the
> > initial nd->path at different times (before or after absolute path
> > handling) depending on whether we have been asked to scope resolution
> > within a root.
> 
> >  	if (*s == '/') {
> > -		set_root(nd);
> > -		if (likely(!nd_jump_root(nd)))
> > -			return s;
> > -		return ERR_PTR(-ECHILD);
> 
> > +		if (likely(!nd->root.mnt))
> > +			set_root(nd);
> 
> How can we get there with non-NULL nd->root.mnt, when LOOKUP_ROOT case
> has been already handled by that point?

Yup, you're completely right. I will remove the
  if (!nd->root.mnt)
in the next version.


-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>