From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Date: Sun, 7 Apr 2013 10:50:18 +0000 (+0000)
Subject: Btrfs: fix missing check before creating a qgroup relation
X-Git-Tag: v3.10-rc1~31^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7fef4f593007d52ba7fe4427e099bd71c63c521;p=pandora-kernel.git

Btrfs: fix missing check before creating a qgroup relation

Step to reproduce:
		mkfs.btrfs <disk>
		mount <disk> <mnt>
		btrfs quota enable <mnt>
		btrfs qgroup assign 0/1 1/1 <mnt>
		umount <mnt>
		btrfs-debug-tree <disk> | grep QGROUP
If we want to add a qgroup relation, we should gurantee that
'src' and 'dst' exist, otherwise, such qgroup relation should
not be allowed to create.

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

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