From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Emelyanov Subject: [PATCH 2/4] tun: Report whether the queue is attached or not Date: Wed, 21 Aug 2013 14:32:00 +0400 Message-ID: <52149720.7070306@parallels.com> References: <521496EF.8090909@parallels.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit To: David Miller , Linux Netdev List Return-path: Received: from relay.parallels.com ([195.214.232.42]:50090 "EHLO relay.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751220Ab3HUKcB (ORCPT ); Wed, 21 Aug 2013 06:32:01 -0400 In-Reply-To: <521496EF.8090909@parallels.com> Sender: netdev-owner@vger.kernel.org List-ID: Multiqueue tun devices allow to attach and detach from its queues while keeping the interface itself set on file. Knowing this is critical for the checkpoint part of criu project. Signed-off-by: Pavel Emelyanov --- drivers/net/tun.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 4b65fbc..db43a24 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1881,6 +1881,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, case TUNGETIFF: tun_get_iff(current->nsproxy->net_ns, tun, &ifr); + if (tfile->detached) + ifr.ifr_flags |= IFF_DETACH_QUEUE; + if (copy_to_user(argp, &ifr, ifreq_len)) ret = -EFAULT; break; -- 1.7.6.5