From: Li Zefan <lizf@cn.fujitsu.com>
Date: Tue, 9 Nov 2010 06:56:50 +0000 (+0800)
Subject: btrfs: Add a helper try_merge_free_space()
X-Git-Tag: v2.6.38-rc4~2^2~21^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=120d66eec0dcb966fbd03f743598b2ff2513436b;p=pandora-kernel.git

btrfs: Add a helper try_merge_free_space()

When adding a new extent, we'll firstly see if we can merge
this extent to the left or/and right extent. Extract this as
a helper try_merge_free_space().

As a side effect, we fix a small bug that if the new extent
has non-bitmap left entry but is unmergeble, we'll directly
link the extent without trying to drop it into bitmap.

This also prepares for the next patch.

Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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