64bit division/remainder in fsys_*.c

[Jochen]

Hi,

I'm trying to port Edward Shishkin's btrfs patch to Gentoo. However, 
when trying to compile, I get the following errors:

undefined reference to "__udivdi3"
undefined reference to "__udivdi3"

This is because the code is doing 64bit divisions. What can I use to do 
those in grub?

Regards,
Jochen