From: Theodore Ts'o <tytso@mit.edu>
Date: Fri, 1 May 2009 01:24:04 +0000 (-0400)
Subject: ext4: Fix and simplify s_dirt handling
X-Git-Tag: v2.6.31-rc1~396^2~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7234ab2a55e77784b44cf2d862136d9e41b8d98a;p=pandora-kernel.git

ext4: Fix and simplify s_dirt handling

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.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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