From b89e1b012c7f81123344058d5f245b844464d30c Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 15 Oct 2014 11:18:44 +0800
Subject: [PATCH] Btrfs, raid56: don't change bbio and raid_map

Because we will reuse bbio and raid_map during the scrub later, it is
better that we don't change any variant of bbio and don't free it at
the end of IO request. So we introduced similar variants into the raid
bio, and don't access those bbio's variants any more.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
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