tree eae55fdac84734729dfbfa6488ec76b6d322199c
parent f5a6b1c53bdd44f79e3904c0f5e59f956b49b2c8
author Qu Wenruo <quwenruo@cn.fujitsu.com> 1425025462 +0800
committer Chris Mason <clm@fb.com> 1428936773 -0700

btrfs: Check qgroup level in kernel qgroup assign.

Although we have qgroup level check in btrfs-progs, it's not enough
since other programe may still call ioctl directly not using
btrfs-progs. For example, systemd.

But it's btrfs-progs to be blame since we don't provide a
full-function(like subvolume create things) btrfs library with enough
check, and only rely on kernel ioctl.

So Add level checks in kernel too.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>