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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@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2013-08-21 14:32:00 +04:00 committed by David S. Miller
parent fb7589a162
commit 3d407a80b6
1 changed files with 3 additions and 0 deletions
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3
drivers/net/tun.c
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@ -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;