netdev - Re: [RFC iproute2 1/1] ip: netns: add mounted state file for each netns

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Message-ID: <CAGnkfhwe6p412q4sATwX=3ht4+NxKJDOFihRG=iwvXqWUtwgLQ@mail.gmail.com>
Date:   Fri, 28 Jun 2019 19:06:45 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Alexander Aring <aring@...atatu.com>,
        netdev <netdev@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
        kernel@...atatu.com
Subject: Re: [RFC iproute2 1/1] ip: netns: add mounted state file for each netns

On Fri, Jun 28, 2019 at 6:27 PM David Howells <dhowells@...hat.com> wrote:
>
> Nicolas Dichtel <nicolas.dichtel@...nd.com> wrote:
>
> > David Howells was working on a mount notification mechanism:
> > https://lwn.net/Articles/760714/
> > https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=notifications
> >
> > I don't know what is the status of this series.
>
> It's still alive.  I just posted a new version on it.  I'm hoping, possibly
> futiley, to get it in in this merge window.
>
> David

Hi all,

this could cause a clash if I create a netns with name ending with .mounted.

$ sudo ip/ip netns add ns1.mounted
$ sudo ip/ip netns add ns1
Cannot create namespace file "/var/run/netns/ns1.mounted": File exists
Cannot remove namespace file "/var/run/netns/ns1.mounted": Device or
resource busy

If you want to go along this road, please either:
- disallow netns creation with names ending with .mounted
- or properly document it in the manpage

Regards,
-- 
Matteo Croce
per aspera ad upstream