From 3f556f7853ec4845a7c219d026cbcdf4cfa8cea7 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Sun, 15 Jun 2014 03:20:26 +0200
Subject: [PATCH] btrfs: unify extent buffer allocation api

Make the extent buffer allocation interface consistent.  Cloned eb will
set a valid fs_info.  For dummy eb, we can drop the length parameter and
set it from fs_info.

The built-in sanity checks may pass a NULL fs_info that's queried for
nodesize, but we know it's 4096.

Signed-off-by: David Sterba <dsterba@suse.cz>
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