From 5ac00addc7ac09110995fe967071d191b5981cc1 Mon Sep 17 00:00:00 2001
From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Mon, 5 Nov 2012 17:54:08 +0100
Subject: [PATCH] Btrfs: disallow mutually exclusive admin operations from user
 mode

Btrfs admin operations that are manually started from user mode
and that cannot be executed at the same time return -EINPROGRESS.
A common way to enter and leave this locked section is introduced
since it used to be specific to the balance operation.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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