linux-kernel - Re: [PATCH] Freeze bdevs when freezing processes.

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Message-ID: <20061024170633.GA17956@infradead.org>
Date:	Tue, 24 Oct 2006 18:06:33 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Chinner <dgc@....com>,
	Nigel Cunningham <ncunningham@...uxmail.org>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	xfs@....sgi.com
Subject: Re: [PATCH] Freeze bdevs when freezing processes.

On Tue, Oct 24, 2006 at 05:29:59PM +0200, Rafael J. Wysocki wrote:
> Do you mean calling sys_sync() after the userspace has been frozen
> may not be sufficient?

No, that's definitly not enough.  You need to freeze_bdev to make sure
data is on disk in the place it's expected by the filesystem without
starting a log recovery.

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