linux-kernel - Re: mount namespace : who mounted what ?

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Message-ID: <20100604040158.GZ31073@ZenIV.linux.org.uk>
Date:	Fri, 4 Jun 2010 05:01:58 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: mount namespace : who mounted what ?

On Thu, Jun 03, 2010 at 10:04:13PM +0200, Daniel Lezcano wrote:
> Hi all,
> 
> I was wondering, in a new mount namespace, if it is possible to know
> which mount points were inherited and which were mounted in a new
> namespace ?
> 
> I looked at /proc/<pid>/mountinfo and investigated a bit on the
> mount id, but this one is not reliable as it changes in the new
> namespace. The /proc/<pid>/mounts file shows all the mount points
> visible for the process inherited or not.

No more than "had it been this process that mmaped that area or was it
inherited from the parent?"
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