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

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Date:	Tue, 8 Sep 2009 21:06:14 +0200
From:	Christoph Hellwig <hch@....de>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Christoph Hellwig <hch@....de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 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.

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