From: Liu Bo <bo.li.liu@oracle.com>
Date: Fri, 2 Aug 2013 08:30:40 +0000 (+0800)
Subject: Btrfs: allow compressed extents to be merged during defragment
X-Git-Tag: v3.12-rc1~40^2~73
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=116e0024c453dfdfacc9278f485dabc9c63a4ac4;p=pandora-kernel.git

Btrfs: allow compressed extents to be merged during defragment

The rule originally comes from nocow writing, but snapshot-aware
defrag is a different case, the extent has been writen and we're
not going to change the extent but add a reference on the data.

So we're able to allow such compressed extents to be merged into
one bigger extent if they're pointing to the same data.

Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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