From 17ce6ef8d731af5edac8c39e806db4c7e1f6956f Mon Sep 17 00:00:00 2001
From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 29 Mar 2012 09:57:45 -0400
Subject: [PATCH] Btrfs: add a check to decide if we should defrag the range

If our file's layout is as follows:
| hole | data1 | hole | data2 |

we do not need to defrag this file, because this file has holes and
cannot be merged into one extent.

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