linux-kernel - Re: [PATCH] proc: move proc mount options out of pid

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Date:	Fri, 24 May 2013 11:03:31 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Stephen Mell <sub.atomic.fusion@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: move proc mount options out of pid_namespace

Hi Stephen,

On 05/24/2013 07:32 AM, Stephen Mell wrote:

> On Thursday, May 23, 2013 18:20:57 Gu Zheng wrote:
> 
>> Here it'll create a new proc sb instance which holds the same context as the old ones
>> each time we mount proc though in the same PID namespace, won't it?
> I believe so. But this is the point, right? 

Yes, but I think it's also the problem.

>They won't be identical if different mount options are used, I don't think.

If different mount options are used, we'll create different super block instance, and they have
the same context, only the difference is each one holds different proc_sb_info.
But I think what we really want is only one proc sb instance and create different proc_sb_info
if different mount options are used.

> 
>> Here the pre-check seems needless.
> Is that new with my patch, or has it always been needless?

Yeah, it's always needless.

Thanks,
Gu

> 
> Thanks,
> Stephen
> 

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