From 305a26af5b2561a66859ef05ed7eb73d3c9f0913 Mon Sep 17 00:00:00 2001
From: Mark Fasheh <mfasheh@suse.com>
Date: Thu, 1 Sep 2011 11:27:57 -0700
Subject: [PATCH] btrfs: Go readonly on tree errors in balance_level

balace_level() seems to deal with missing tree nodes by BUG_ON(). Instead,
we can easily just set the file system readonly and bubble -EROFS back up
the stack.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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