From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Date: Tue, 19 Mar 2013 10:57:14 +0000 (+0000)
Subject: Btrfs: fix missing qgroup reservation before fallocating
X-Git-Tag: v3.9-rc5~8^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6113077cd319e747875ec71227d2b5cb54e08c76;p=pandora-kernel.git

Btrfs: fix missing qgroup reservation before fallocating

Steps to reproduce:
	mkfs.btrfs <disk>
	mount <disk> <mnt>
	btrfs quota enable <mnt>
	btrfs sub create <mnt>/subv
	btrfs qgroup limit 10M <mnt>/subv
	fallocate --length 20M <mnt>/subv/data

For the above example, fallocating will return successfully which
is not expected, we try to fix it by doing qgroup reservation before
fallocating.

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>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

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