From 4d90d28b1c5c5ab6292c0888dc1ebdfc3023f877 Mon Sep 17 00:00:00 2001
From: Anand Jain <anand.jain@oracle.com>
Date: Sun, 6 Apr 2014 12:59:07 +0800
Subject: [PATCH] btrfs: btrfs_rm_device() should zero mirror SB as well

This fix will ensure all SB copies on the disk is zeroed
when the disk is intentionally removed. This helps to
better manage disks in the user land.

This version of patch also merges the Zach patch as below.

 btrfs: don't double brelse on device rm

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Zach Brown <zab@redhat.com>
Signed-off-by: Chris Mason <clm@fb.com>
---
Reading git-format-patch failed