From 1b94b5567e9c70ad3b24bd5e576a422246875c2a Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Nov 2014 16:14:21 +0800
Subject: [PATCH] Btrfs, raid56: use a variant to record the operation type

We will introduce new operation type later, if we still use integer
variant as bool variant to record the operation type, we would add new
variant and increase the size of raid bio structure. It is not good,
by this patch, we define different number for different operation,
and we can just use a variant to record the operation type.

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