Hello, all. It seems that recently there are different rumors and
misunderstandings about btrfs support. This mail is to make the things
clear.
1) Technical work is done. I haven't reviewed any patches to avoid being
tainted.
2) Every patch submitted till now uses Oracle's copyrighted work
released only under GPLv2 which is incompatible with GRUB
3) license incompatible works aren't ok for either grub or grub-extras. Why?
There are 3 kind of works:
a) Freely redistribuable. Guaranteed. Protected.
   A code for which copyright assignment was signed and which if
improperly used can be protected by FSF.
b) Freely redistribuable. Guaranteed.
   A code for which copyright disclaimers were signed which makes for
copyright holder impossible to sue users.
c) Freely redistribuable.
   No disclaimers were signed but the will of author to release to
public usage was sufficiently clear.
d) Not redistribuable
   Distribution of such code will be a plain copyright infrigement

For GNU GRUB code under a and b is ok. Occasionaly code of type c is
permitted on case-by-case basis (e.g. lzma).
grub-extras has a less strict copyright policy. For grub-extras code
under a, b and c is ok. In practice it holds only code under c since
code under a and b is in GRUB proper.
Code under d isn't ok for either project. Neither GNU GRUB nor
grub-extras is a place for "warez".

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko