From f7039b1d5c32241f87a513e33120db36bf30264d Mon Sep 17 00:00:00 2001
From: Li Dongyang <lidongyang@novell.com>
Date: Thu, 24 Mar 2011 10:24:28 +0000
Subject: [PATCH] Btrfs: add btrfs_trim_fs() to handle FITRIM

We take an free extent out from allocator, trim it, then put it back,
but before we trim the block group, we should make sure the block group is
cached, so plus a little change to make cache_block_group() run without a
transaction.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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