From 8e73f275011b3264a87339fd9f1690e944e381c9 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 3 Apr 2009 10:14:18 -0400
Subject: [PATCH] Btrfs: Optimize locking in btrfs_next_leaf()

btrfs_next_leaf was using blocking locks when it could have been using
faster spinning ones instead.  This adds a few extra checks around
the pieces that block and switches over to spinning locks.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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