From 8e005f7c0276317cfa8fcb0291a0df57f9ef832c Mon Sep 17 00:00:00 2001
From: majianpeng <majianpeng@gmail.com>
Date: Thu, 14 Nov 2013 15:16:18 +1100
Subject: [PATCH] raid1: Add some macros to make code clearly.

In a subsequent patch, we'll use some const parameters.
Using macros will make the code clearly.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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