From 40f765805f082ed679c55bf6ab60212e55fb6fc1 Mon Sep 17 00:00:00 2001
From: Chris Mason <clm@fb.com>
Date: Wed, 21 May 2014 13:35:51 -0700
Subject: [PATCH] Btrfs: split up __extent_writepage to lower stack usage

__extent_writepage has two unrelated parts.  First it does the delayed
allocation dance and second it does the mapping and IO for the page
we're actually writing.

This splits it up into those two parts so the stack from one doesn't
impact the stack from the other.

Signed-off-by: Chris Mason <clm@fb.com>
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