From: Liu Bo <bo.li.liu@oracle.com>
Date: Thu, 6 Sep 2012 01:10:51 +0000 (-0600)
Subject: Btrfs: use flag EXTENT_DEFRAG for snapshot-aware defrag
X-Git-Tag: v3.7-rc1~71^2~65
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e8a4a8b0b9484e8d14674fc62c9ad8ac9dbce5b;p=pandora-kernel.git

Btrfs: use flag EXTENT_DEFRAG for snapshot-aware defrag

We're going to use this flag EXTENT_DEFRAG to indicate which range
belongs to defragment so that we can implement snapshow-aware defrag:

We set the EXTENT_DEFRAG flag when dirtying the extents that need
defragmented, so later on writeback thread can differentiate between
normal writeback and writeback started by defragmentation.

Original-Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
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