From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Date: Mon, 8 Apr 2013 10:56:22 +0000 (+0000)
Subject: Btrfs: use tree_root to avoid edquot when disabling quota
X-Git-Tag: v3.10-rc1~31^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92f183aa5b8a8655431583e4c53e80fa3e0070e5;p=pandora-kernel.git

Btrfs: use tree_root to avoid edquot when disabling quota

Steps to reproduce:
	mkfs.btrfs <disk>
	mount <disk> <mnt>
	btrfs quota enable <mnt>
	btrfs sub create <mnt>/subv
	btrfs qgroup limit 10K <mnt>/subv
	btrfs quota disable <mnt>/subv

It is wrong for qgroup to reserve when disabling quota,
so just use tree_root to avoid edquot when disabling quota.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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