From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Mar 2014 05:54:55 +0000 (+0800)
Subject: Btrfs: fix early enospc due to the race of the two ordered extent wait
X-Git-Tag: v3.15-rc1~96^2~21
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b9d83cd6bebe10e9965d2cef8053b02663eaad8;p=pandora-kernel.git

Btrfs: fix early enospc due to the race of the two ordered extent wait

btrfs_wait_ordered_roots() moves all the list entries to a new list,
and then deals with them one by one. But if the other task invokes this
function at that time, it would get a empty list. It makes the enospc
error happens more early. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
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