From 8250dabedb633e162bce89f2aacf5e65fa9e6464 Mon Sep 17 00:00:00 2001
From: Andreas Philipp <philipp.andreas@gmail.com>
Date: Sat, 11 May 2013 11:13:03 +0000
Subject: [PATCH] Correct allowed raid levels on balance.

Raid5 with 3 devices is well defined while the old logic allowed
raid5 only with a minimum of 4 devices when converting the block group
profile via btrfs balance. Creating a raid5 with just three devices
using mkfs.btrfs worked always as expected. This is now fixed and the
whole logic is rewritten.

Signed-off-by: Andreas Philipp <philipp.andreas@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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