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

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Message-ID: <CA+5PVA5GWsTdNky-K1-hu5_R55hdKfr-Oa26HpX=FdA1cRZsbQ@mail.gmail.com>
Date:	Tue, 17 Dec 2013 11:03:00 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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?

josh
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