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

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Message-Id: <201205252113.50900.rjw@sisk.pl>
Date:	Fri, 25 May 2012 21:13:50 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org, Dave Chinner <david@...morbit.com>,
	Nigel Cunningham <nigel@...onice.net>,
	Pavel Machek <pavel@....cz>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH] PM / Sleep: Freeze filesystems during system suspend/hibernation

On Friday, May 25, 2012, Josh Boyer wrote:
> On Fri, Feb 17, 2012 at 3:59 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> commit b94887bbc0621e1e8402e7f0ec4bc3adf46c9a6e
> >> Author: Rafael J. Wysocki <rjw@...k.pl>
> >> Date:   Fri Feb 17 12:42:08 2012 -0500
> >>
> >>     Freeze all filesystems during system suspend and (kernel-driven)
> >>     hibernation by calling freeze_supers() for all superblocks and thaw
> >>     them during the subsequent resume with the help of thaw_supers().
> >>
> >>     This makes filesystems stay in a consistent state in case something
> >>     goes wrong between system suspend (or hibernation) and the subsequent
> >>     resume (e.g. journal replays won't be necessary in those cases).  In
> >>     particular, this should help to solve a long-standing issue that, in
> >>     some cases, during resume from hibernation the boot loader causes the
> >>     journal to be replied for the filesystem containing the kernel image
> >>     and/or initrd causing it to become inconsistent with the information
> >>     stored in the hibernation image.
> >>
> >>     The user-space-driven hibernation (s2disk) is not covered by this
> >>     change, because the freezing of filesystems prevents s2disk from
> >>     accessing device special files it needs to do its job.
> >>
> >>     This change is based on earlier work by Nigel Cunningham.
> >>
> >>     Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> >>
> >>     Rebased to 3.3-rc3 by Josh Boyer <jwboyer@...hat.com>
> 
> Did this patch ever wind up going anywhere?  Fedora has it sitting in
> our tree with a comment that says "rebase" and I don't see it in the
> linux-next tree at all.
> 
> Did if fall through the cracks or was it NAKed somewhere?

No, it wasn't in principle. There were some comments I haven't addressed yet.

Thanks,
Rafael
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