linux-kernel - Re: [PATCH 1/8] kernfs: Add API to generate relative kernfs path

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Message-ID: <20151130151147.GG3535@mtj.duckdns.org>
Date:	Mon, 30 Nov 2015 10:11:47 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Cc:	serge@...lyn.com, linux-kernel@...r.kernel.org,
	adityakali@...gle.com, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	lxc-devel@...ts.linuxcontainers.org, akpm@...ux-foundation.org,
	ebiederm@...ssion.com
Subject: Re: [PATCH 1/8] kernfs: Add API to generate relative kernfs path

Hello,

On Thu, Nov 26, 2015 at 11:25:11PM -0600, Serge E. Hallyn wrote:
> > > +	/* Short-circuit the easy case - kn_to is the root node. */
> > > +	if ((kn_from == kn_to) || (!kn_from && !kn_to->parent)) {
> > > +		*p = '/';
> > > +		*(p + 1) = '\0';
> > 
> > Hmm... so if kn_from == kn_to, the output is "/"?
> 
> Yes, that's what seems to make the most sense for cgroup namespaces.  I
> could see a case for '.' being used instead in general, but for cgroup
> namespaces I think we'd have to convert those back to '/'.  Otherwise
> we'll fail in being able to run legacy software, which would get
> confused.

Yeah, I agree but the name is kinda misleading tho.  The output isn't
really a relative path but rather absolute path against the specified
root.  Maybe updating the function and parameter names would be
helpful?

Thanks.

-- 
tejun
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