From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Tue, 22 Apr 2014 09:13:51 +0000 (+0800)
Subject: btrfs: Add check to avoid cleanup roots already in fs_info->dead_roots.
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~54^2~58
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65d33fd7a6e4aaf9cd6577555d0b3c18fbefe415;p=pandora-kernel.git

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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