netdev - iproute2: ip netns: Do not delete netns if there any process use it

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Message-ID: <20150311074020.GA26477@angus-think.wlc.globallogic.com>
Date:	Wed, 11 Mar 2015 09:40:20 +0200
From:	Vadim Kochan <vadim4j@...il.com>
To:	netdev@...r.kernel.org
Subject: iproute2: ip netns: Do not delete netns if there any process use it

Hi,

There might be case when it is possible to loose device which was
moved to netns if there is process which is running is that netns:

    $ ip netns add net
    $ ip link set dev eth0 netns net0
    $ ip netns exec net0 SOME_PROCESS_IN_BACKGROUND
    $ ip netns del net0

so eth0 will not appear in the default netns until SOME_PROCESS_IN_BACKGROUND will exit or
will ne killed. So to avoid such case it might be better to do not
delete netns if there are process in it ? I meant add such validation
for 'ip netns del' command.

What do you think ?

Thanks,
Vadim Kochan
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