linux-kernel - Re: Question for remount

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Message-ID: <49A20ACE.7020309@cn.fujitsu.com>
Date:	Mon, 23 Feb 2009 10:32:46 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Paul Menage <menage@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	containers@...ts.linux-foundation.org
Subject: Re: Question for remount

KAMEZAWA Hiroyuki wrote:
> Paul Menage さんは書きました：
>> On Fri, Feb 20, 2009 at 2:02 AM, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@...fujitsu.com> wrote:
>>> 2. /proc/mounts information of release_agent should be updated....
>>>   when it's overwritten directly.
>> Yes, definitely. But shouldn't that happen already?
>> cgroup_show_options() reports the current value of
>> root->release_agent_path in /proc/mounts. Is it possible that mount is
>> actually storing/retrieving this information in /etc/mtab, which
>> doesn't get updated?
>>
> Ah, you're right. /proc/mounts is updated but /etc/mtab is not updated.
> Hmm..from man mount(1), /etc/mtab is not synchronized with /proc/mounts.
> Do we need to allow release_agent override at remount ?
> 

Since we've allowed this behavior, I think we shouldn't disallow it to
supprise users?

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