From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yien Zheng <esprout@gmail.com>
Subject: Re: [PATCH] Btrfs: take block group fragmentation into account for
	allocation
Date: Sun, 8 Mar 2009 08:42:45 -0600
Message-ID: <2c259a8f0903080742l6e2f6233g709b036281bf962c@mail.gmail.com>
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Cc: Josef Bacik <jbacik@redhat.com>
To: linux-btrfs@vger.kernel.org
Return-path: <linux-btrfs-owner@vger.kernel.org>
List-ID: <linux-btrfs.vger.kernel.org>

I tried applying this patch, but the fragmentation_percent function is
giving me:

WARNING: "__udivdi3"
[/home/partition6/yien/git/linux-git/fs/btrfs/btrfs.ko] undefined!

when I compile, and the module fails to load, even though the build
completes.  I've traced it to the calculation of max_fragments:

max_fragments = (block_group->key.offset -
		btrfs_block_group_used(&block_group->item)) /
		block_group->fragment_size;

It seems that accessing block_group in here is causing a reference to
__udivdi3 somehow.  Any idea what's going on here?