From 1cecf579d161527f610ef0da852dd6122e434a49 Mon Sep 17 00:00:00 2001
From: chandan <chandan@linux.vnet.ibm.com>
Date: Fri, 13 Sep 2013 19:34:10 +0530
Subject: [PATCH] Btrfs: btrfs_ioctl_default_subvol: Revert back to toplevel
 subvolume when arg is 0

This patch makes it possible to set BTRFS_FS_TREE_OBJECTID as the default
subvolume by passing a subvolume id of 0.

Signed-off-by: chandan <chandan@linux.vnet.ibm.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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