linux-ext4 - Re: [PATCH 2/3] ext4: Fix and simplify s

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Date:	Fri, 1 May 2009 03:02:55 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/3] ext4: Fix and simplify s_dirt handling

On Fri, May 01, 2009 at 12:37:16AM -0400, Theodore Ts'o wrote:
> The s_dirt flag wasn't completely handled correctly, but it didn't
> really matter when journalling was enabled.  It turns out that when
> ext4 runs without a journal, we don't clear s_dirt in places where we
> should have, with the result that the high-level write_super()
> function was writing the superblock when it wasn't necessary.
> 
> So we fix this by making ext4_commit_super() clear the s_dirt flag,
> and removing many of the other places where s_dirt is manipulated.
> When journalling is enabled, the s_dirt flag might be left set more
> often, but s_dirt really doesn't matter when journalling is enabled.

Btw, you might want to move all s_dirt setting into a wrapper, so that
it never gets set for journal mode.  That way we can avoid superflous
calls into the filesystem in that default mode.

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