From mboxrd@z Thu Jan 1 00:00:00 1970 From: Serge Hallyn Subject: Re: [PATCH RESEND] userns: enable tmpfs support for user namespace Date: Thu, 17 Jan 2013 11:14:51 -0600 Message-ID: <20130117171451.GA31219@sergelap> References: <1358331945-4106-1-git-send-email-gaofeng@cn.fujitsu.com> <20130116143532.GA4035@sergelap> <50F74EC6.60004@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <50F74EC6.60004-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Gao feng Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org List-Id: containers.vger.kernel.org Quoting Gao feng (gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org): > On 2013/01/16 22:35, Serge Hallyn wrote: > > Quoting Gao feng (gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org): > >> From: gaofeng > >> > >> Since the memory used by tmpfs is under control of > >> memory cgroup. and the files under the tmpfs will not > >> be leak to other tmpfs. > >> > >> So mounting tmpfs in user namespace does no harm to the > >> host,we can allow tmpfs to be mounted in user namespace. > >> > >> Signed-off-by: gaofeng > > > > I've got the same patch in my kernel at > > http://kernel.ubuntu.com/git?p=serge/quantal-userns.git;a=summary > > > > except note that there are two definitions of shmem_fs_type. > > > > Yes, I miss the other one,Do you have plan to push this patch > into linus's linux-2.6 or eric's userns tree? I actually was waiting for Eric to do it, but I'll happily send it to linux-fsdevel and lkml (in a bit). > I'm trying to add userns support for libvirt,so I need tmpfs to > be allowed to mount in userns. -serge