linux-kernel - Re: [RFC PATCH 2/2] Add timeout feature

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Message-Id: <3AF481B79787436E8E20D6C597D5DD1C@nsl.ad.nec.co.jp>
Date:	Wed, 2 Apr 2008 21:16:59 +0900
From:	"Takashi Sato" <t-sato@...jp.nec.com>
To:	"David Chinner" <dgc@....com>
Cc:	<linux-kernel@...r.kernel.org>, <dm-devel@...hat.com>,
	<xfs@....sgi.com>, <linux-fsdevel@...r.kernel.org>,
	<linux-ext4@...r.kernel.org>
Subject: Re: [RFC PATCH 2/2] Add timeout feature

Hi,

David Chinner wrote:
>> Exactly my timeout feature is only for an application, not for
>> freeze_bdev().
>> I think it is needed for the situation we can't unfreeze from userspace.
>> (e.g. Freezing the root filesystem)
>
> Ummm - why can't you unfreeze the root fs from userspace? freezing
> only prevents modification to the filesystem. A frozen filesystem is
> effectively a read-only filesystem...
>
> On XFS:
>
> # xfs_freeze -f /
> # echo $?
> 0
> # xfs_freeze -u /
> # echo $?
> 0

Yes. If we have already logged in, we can unfreeze as above.
But if not, we cannot log in and unfreeze because the modification
of /var/log/wtmp is blocked in the log-in procedure.
The timeout feature will work in such case.

Cheers, Takashi
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