Date: Tue, 1 Dec 2015 11:46:49 -0500
From: Tejun Heo <tj@kernel.org>
To: "Serge E. Hallyn" <serge.hallyn@ubuntu.com>
Cc: serge@hallyn.com, linux-kernel@vger.kernel.org, adityakali@google.com,
        linux-api@vger.kernel.org, containers@lists.linux-foundation.org,
        cgroups@vger.kernel.org, lxc-devel@lists.linuxcontainers.org,
        akpm@linux-foundation.org, ebiederm@xmission.com
Subject: Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init
 cgroupns
Message-ID: <20151201164649.GD12922@mtj.duckdns.org>
References: <1447703505-29672-1-git-send-email-serge@hallyn.com>
 <1447703505-29672-8-git-send-email-serge@hallyn.com>
 <20151124171610.GS17033@mtj.duckdns.org>
 <20151127051745.GA24521@mail.hallyn.com>
 <20151130150938.GF3535@mtj.duckdns.org>
 <20151201040704.GA31067@mail.hallyn.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20151201040704.GA31067@mail.hallyn.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 814
Lines: 24

Hey, Serge.

On Mon, Nov 30, 2015 at 10:07:04PM -0600, Serge E. Hallyn wrote:
> So actually the way the code is now, the first mount cannot
> be done from a non-init user namespace; and kernfs_obtain_root()
> is only called from non-init user namespace.  So can we assume
> that the root dentry will be instantiated?  (or can it get
> evicted?)
> 
> If we can assume that then most of that fn can go away.

The v2 hierarchy is always mounted and non-init ns shouldn't be able
to create new v1 hierarchies, so the root dentry should always be
there.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/