From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) Subject: Re: [PATCH] userns: enable tmpfs support for user namespace. Date: Wed, 19 Sep 2012 03:40:20 -0700 Message-ID: <87wqzq8fe3.fsf@xmission.com> References: <1348042588-9031-1-git-send-email-gaofeng@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1348042588-9031-1-git-send-email-gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org> (Gao feng's message of "Wed, 19 Sep 2012 16:16:28 +0800") 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 List-Id: containers.vger.kernel.org Gao feng writes: > mounting tmpfs in user namespace does no harm to the host. > so enable tmpfs support for the user namespace. I think this allows escaping from memory resource limits. Eric > Signed-off-by: Gao feng > --- > mm/shmem.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/mm/shmem.c b/mm/shmem.c > index d4e184e..ef97dc3 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -2801,6 +2801,7 @@ static struct file_system_type shmem_fs_type = { > .name = "tmpfs", > .mount = shmem_mount, > .kill_sb = kill_litter_super, > + .fs_flags = FS_USERNS_MOUNT, > }; > > int __init shmem_init(void)