From 65d33fd7a6e4aaf9cd6577555d0b3c18fbefe415 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Tue, 22 Apr 2014 17:13:51 +0800
Subject: [PATCH] btrfs: Add check to avoid cleanup roots already in
 fs_info->dead_roots.

Current btrfs_orphan_cleanup will also cleanup roots which is already in
fs_info->dead_roots without protection.
This will have conditional race with fs_info->cleaner_kthread.

This patch will use refs in root->root_item to detect roots in
dead_roots and avoid conflicts.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
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