From: Li Dongyang <lidongyang@novell.com>
Date: Thu, 24 Mar 2011 10:24:28 +0000 (+0000)
Subject: Btrfs: add btrfs_trim_fs() to handle FITRIM
X-Git-Tag: v2.6.39-rc1~19^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7039b1d5c32241f87a513e33120db36bf30264d;p=pandora-kernel.git

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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