From 9247f3170b2c3d648707c93bbebcd763fac17c06 Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Mon, 26 Nov 2012 09:24:43 +0000
Subject: [PATCH] Btrfs: use slabs for auto defrag allocation

The auto defrag allocation is in the fast path of the IO, so use slabs
to improve the speed of the allocation.

And besides that, it can do check for leaked objects when the module is removed.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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