netdev - [PATCH 2/4] tun: Report whether the queue is attached or not

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Date:	Mon, 19 Aug 2013 19:09:56 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Linux Netdev List <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: [PATCH 2/4] tun: Report whether the queue is attached or not

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 <xemul@...allels.com>
---
 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 a12450b..167222f 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
--
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