On Thu, 11 Jun 2009, Chris Mason wrote:
> Existing filesystems will be upgraded to the new format on the first
> mount.  All of your old data will still be there and still work
> properly, but I strongly recommend a full backup before going to the new
> code.


This is horrible. I just screwed up my system by booting a kernel on this: 
it worked beatifully, but due to other reasons I then wanted to bisect a 
totally unrelated issue. While having _totally_ forgotten about this 
issue, even if I was technically aware of it.

.. so I installed a new kernel, and now it won't boot due to "couldn't 
mount because of unsupported optional features (1)". In fact, I have no 
kernel available on that system that will boot, since my normal "safe" 
fall-back kernels are all distro kernels that can't boot this either.

Ok, so I'll end up booting from a USB stick, and it will all work out in 
the end, but this does essentially make it entirely impossible to do any 
bisection on any btrfs system.


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