From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 26 Jan 2012 20:01:12 +0000 (-0500)
Subject: Btrfs: do not defrag a file partially
X-Git-Tag: v3.3-rc2~16^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ec31b548a17f773ab6289e795ed3a6820e8b56e;p=pandora-kernel.git

Btrfs: do not defrag a file partially

xfstests 218 complains that btrfs defrags a file partially:
 After: 1
 Write backwards sync, but contiguous - should defrag to 1 extent
 Before: 10
-After: 1
+After: 2

To fix this, we need to set max_to_defrag count properly.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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