From a9c9bf68276c36898e23db770a65bd9b75bfac58 Mon Sep 17 00:00:00 2001
From: Arne Jansen <sensille@gmx.net>
Date: Tue, 12 Apr 2011 11:01:20 +0200
Subject: [PATCH] btrfs: heed alloc_start

currently alloc_start is disregarded if the requested
chunk size is bigger than (device size - alloc_start),
but smaller than the device size.
The only situation where I see this could have made sense
was when a chunk equal the size of the device has been
requested. This was possible as the allocator failed to
take alloc_start into account when calculating the request
chunk size. As this gets fixed by this patch, the workaround
is not necessary anymore.
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