Btrfs devel - Dec 2008 - Supported Kernels

According to the FAQ at http://btrfs.wiki.kernel.org/index.php/FAQ all
kernels downto 2.6.18 should be supported. I have tried to compile
against 2.6.18(Debian Kernel), 2.6.24(Debian Kernel), 2.6.26(Debian
Kernel), and 2.6.27(Ubuntu Kernel) and I have only been able to compile
successfully against 2.6.27. Is btrfs still trying to maintain backwards
compatibility with older version or is the focus on finilizing the on
disk format?

Thanks,

Lee
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On Monday 01 December 2008, Lee Trager wrote:
> According to the FAQ at http://btrfs.wiki.kernel.org/index.php/FAQ all
> kernels downto 2.6.18 should be supported. I have tried to compile
> against 2.6.18(Debian Kernel), 2.6.24(Debian Kernel), 2.6.26(Debian
> Kernel), and 2.6.27(Ubuntu Kernel) and I have only been able to compile
> successfully against 2.6.27. Is btrfs still trying to maintain backwards
> compatibility with older version or is the focus on finilizing the on
> disk format?
I think at the moment the focus is on finalizing the disk format. But as far 
as I know it is still planned to maintain backwards compatibility down to 
2.6.18 for both, Debian Etch and RedHat Enterprise Linux.
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Regards,
Chris