linux-kernel - Re: Regression in suspend to ram in 2.6.31-rc kernels

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Message-Id: <200909082148.33872.rjw@sisk.pl>
Date:	Tue, 8 Sep 2009 21:48:33 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Christoph Hellwig <hch@....de>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mmc@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: Regression in suspend to ram in 2.6.31-rc kernels

On Tuesday 08 September 2009, Christoph Hellwig wrote:
> On Fri, Sep 04, 2009 at 09:47:46AM +0900, OGAWA Hirofumi wrote:
> > Well, that commit seems a bit strange. It calls fat_clusters_flush()
> > unconditionally without checking sb->s_dirt. However, if my guess is
> > right, "sync after removed event" itself sounds like the issue in
> > suspend process.
> 
> The idea of ->sync_fs is that we always perform the sync activity,
> and not just the usual background superblock writeback trigerred by
> s_dirt.  If FAT doesn't need that and never has races around s_dirt
> you can add the check back, but I would recommend against it.
> 
> Also when you hack around this in FAt MMC will still fail with every
> other filesystem.

So, what should be done in your opinion?

Rafael
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