From e679376911d016b670c8cfc1645c178f77e8d1d3 Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Tue, 13 Sep 2011 11:18:10 +0200
Subject: [PATCH] Btrfs: add helper for tree enumeration

Often no exact match is wanted but just the next lower or
higher item. There's a lot of duplicated code throughout
btrfs to deal with the corner cases. This patch adds a
helper function that can facilitate searching.

Signed-off-by: Arne Jansen <sensille@gmx.net>
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