From 8c9c2bf7a3c4f7e9d158c0be9c49f372fb943ad2 Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Sat, 25 Feb 2012 09:09:30 +0100
Subject: [PATCH] btrfs: fix race in reada

When inserting into the radix tree returns EEXIST, get the existing
entry without giving up the spinlock in between.
There was a race for both the zones trees and the extent tree.

Signed-off-by: Arne Jansen <sensille@gmx.net>
---
Reading git-format-patch failed