Re: [PATCH v9 04/10] namei: split out nd->dfd handling to dirfd_path_init

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2019-07-12, Aleksa Sarai <cyphar@xxxxxxxxxx> wrote:
> On 2019-07-12, Al Viro <viro@xxxxxxxxxxxxxxxxxx> 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.

Ah sorry, there is a reason for it -- later in the series the
LOOKUP_BENEATH case means that you might end up with a non-NULL
nd->root.mnt. If you want, I can move the addition of the conditional to
later in the series (it was easier to split the patch by-hunk back when
you originally asked me to split out dirfd_path_init()).

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

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux