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

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Message-ID: <CAHA+R7Pwfjg4642i1FMG1mKJN58K+nYhqvN_NnrbQ+uiPXibGQ@mail.gmail.com>
Date:	Wed, 11 Mar 2015 09:38:04 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Vadim Kochan <vadim4j@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: iproute2: ip netns: Do not delete netns if there any process use it

On Wed, Mar 11, 2015 at 12:40 AM, Vadim Kochan <vadim4j@...il.com> wrote:
>
> 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.

No, kernel does all the reference counting, no need to bother iproute2.
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