From 44871b1b24b593996db43495cf4484cc580bdc10 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 13 Mar 2009 10:04:31 -0400
Subject: [PATCH] Btrfs: reduce stack usage in some crucial tree balancing
 functions

Many of the tree balancing functions follow the same pattern.

1) cow a block
2) do something to the result

This commit breaks them up into two functions so the variables and
code required for part two don't suck down stack during part one.

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