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

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Date:	Wed, 18 Dec 2013 07:31:59 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	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 Tue, Dec 17, 2013 at 8:16 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Tuesday, December 17, 2013 08:00:55 PM Josh Boyer wrote:
>> On Tue, Dec 17, 2013 at 7:52 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> > On Tuesday, December 17, 2013 11:04:46 AM Josh Boyer wrote:
>> >> On Tue, Dec 17, 2013 at 11:03 AM, Josh Boyer <jwboyer@...oraproject.org> wrote:
>> >> > On Fri, May 25, 2012 at 3:13 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> >> >> 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.
>> >> >
>> >> > Dredging up a really old thread, sorry.
>> >> >
>> >> > We're still carrying this patch along in Fedora.  Should we drop it at
>> >> > this point, or is it still eventually going to head upstream?
>> >>
>> >> Fixed Rafael's email address.  (Double sorry.)
>> >
>> > No biggie.
>> >
>> > I just hadn't got sufficient response for that patch at the time it was
>> > submitted, so I guess it would be good to resubmit it.  Please feel free to
>> > do that if you want.
>>
>> You want me to resend a patch you authored back to you?  I mean, I can
>> do that but it seems a bit strange.  All I did was rebase what you
>> wrote to a newer kernel version.
>
> Well, you can send it to me in private then and I'll resubmit. :-)

Done.  Thanks.

josh
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