linux-kernel - Re: [RFC][PATCH] PM / Sleep: Freeze filesystems during system suspend/hibernation

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Message-ID: <20120131000319.GH7827@quack.suse.cz>
Date:	Tue, 31 Jan 2012 01:03:19 +0100
From:	Jan Kara <jack@...e.cz>
To:	Nigel Cunningham <nigel@...onice.net>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Jan Kara <jack@...e.cz>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, Dave Chinner <david@...morbit.com>,
	Pavel Machek <pavel@....cz>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC][PATCH] PM / Sleep: Freeze filesystems during system
 suspend/hibernation

On Tue 31-01-12 08:10:37, Nigel Cunningham wrote:
> Hi.
> 
> On 31/01/12 08:05, Rafael J. Wysocki wrote:
> > On Monday, January 30, 2012, Jan Kara wrote:
> >> On Sat 28-01-12 14:45:49, Rafael J. Wysocki wrote:
> >>> +	/*
> >>> +	 * Freeze in reverse order so filesystems depending on others are
> >>> +	 * frozen in the right order (eg. loopback on ext3).
> >>> +	 */
> >>   Ho, hum, are you sure the order in super_blocks list is the one you need?
> >> Maybe it is but I'm not sure you are guaranteed it is.
> > 
> > Well, is there any way I can get the right order?
> 
> Jan, what's the case where the reverse of mount order might be the wrong
> order?
  After some though, I'm not able to come up with a counterexample. As I
wrote to Rafael, let's at least document that we rely on some ordering of
super_blocks list.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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