netdev - Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while creating kernel sockets

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Message-ID: <CAHA+R7POE-X0Tbn6XEGSta=tDZQ_+EDg0ruSxy3qMFNm9Rd0oQ@mail.gmail.com>
Date:	Thu, 7 May 2015 11:53:32 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Ying Xue <ying.xue@...driver.com>, netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Pavel Emelyanov <xemul@...nvz.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>, maxk@....qualcomm.com,
	Stephen Hemminger <stephen@...workplumber.org>,
	Thomas Graf <tgraf@...g.ch>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Tom Herbert <tom@...bertland.com>,
	James Chapman <jchapman@...alix.com>,
	Erik Hugne <erik.hugne@...csson.com>, jon.maloy@...csson.com,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [RFC PATCH net-next 00/11] netns: don't switch namespace while
 creating kernel sockets

On Thu, May 7, 2015 at 11:26 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Cong Wang <cwang@...pensource.com> writes:
>
>>
>> Why does this have to be so complicated? We can simply avoid
>> calling ops_init() by skipping those in cleanup_list, no?
>
> The problem is that there is a single list of methods to call and if you
> simply skip calling the initialization methods for a struct net and add
> yourself to the list cleanup_net will then call the cleanup methods
> without calling the cleanup methods.

If you mean pernet_list, ops->list has been already added before
for_each_net().

>
> Simply limiting new network namespace registrations to a point when
> network namespaces are not being registered or unregisted seems like
> the simplest way to achieve this effect.
>

Literally, any point before ops_init().
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