From e6b5859cccfa0fec02f3c5b1069481efc7186f47 Mon Sep 17 00:00:00 2001
From: Tristan Ye <tristan.ye@oracle.com>
Date: Fri, 18 Mar 2011 14:35:37 +0800
Subject: [PATCH] Ocfs2/move_extents: helper to probe a proper region to move
 in an alloc group.

Before doing the movement of extents, we'd better probe the alloc group from
'goal_blk' for searching a contiguous region to fit the wanted movement, we
even will have a best-effort try by compromising to a threshold around the
given goal.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
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