From 594994aa3ea4cb52cba9c83a4b6f03e6ff3a646e Mon Sep 17 00:00:00 2001
From: Miguel <miguel.filipe@gmail.com>
Date: Fri, 11 Apr 2008 15:46:48 -0400
Subject: [PATCH] Btrfs: define write_cache_pages for linux kernel <= 2.6.20
 instead

write_cache_pages doesn't exist in linux 2.6.20,  change the #if
condition to match that.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Reading git-format-patch failed