netdev - Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

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Message-ID: <4B8843FE.4000404@cs.columbia.edu>
Date:	Fri, 26 Feb 2010 16:58:22 -0500
From:	Oren Laadan <orenl@...columbia.edu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Pavel Emelyanov <xemul@...allels.com>,
	Ben Greear <greearb@...delatech.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

Eric W. Biederman wrote:
> Pavel Emelyanov <xemul@...allels.com> writes:
> 
>>>> Yet another set of per-namespace IDs along with CLONE_NEWXXX ones?
>>>> I currently have a way to create all namespaces we have with one
>>>> syscall. Why don't we have an ability to enter them all with one syscall?
>>> The CLONE_NEWXXX series of bits has been an royal pain to work with,
>>> and it appears to be unnecessary complications for no gain.
>> That's the answer for the "Yet another set..." question.
>> How about the "Why don't we have..." one?
> 
> I am not certain which question you are asking:
> 
> Why don't we have an ability to enter all namespaces with one syscall
> invocation?

That's how I understood the question, and I, too, wonder why not ?

By the way, an alternative to using bitmap is to change the prototype
of setns() to accept an array of FD's:

	int setns(int *fds, int nfds);

So the process will atomically enter all the namespaces as specified
by the FDs.

Oren.

> 
> Why don't we have a syscall that allows us to enter every namespace?
> 
> Eric
> 
> _______________________________________________
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> Containers@...ts.linux-foundation.org
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> 
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