From 3b080b2564287be91605bfd1d5ee985696e61d3c Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Tue, 1 Apr 2014 18:01:43 +0800
Subject: [PATCH] Btrfs: scrub raid56 stripes in the right way

Steps to reproduce:
 # mkfs.btrfs -f /dev/sda[8-11] -m raid5 -d raid5
 # mount /dev/sda8 /mnt
 # btrfs scrub start -BR /mnt
 # echo $? <--unverified errors make return value be 3

This is because we don't setup right mapping between physical
and logical address for raid56, which makes checksum mismatch.
But we will find everthing is fine later when rechecking using
btrfs_map_block().

This patch fixed the problem by settuping right mappings and
we only verify data stripes' checksums.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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