Re: known UUID and metadata consistency

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On Mon, May 12, 2014 at 07:10:17PM +0200, David Sterba wrote:
> One thing that looks as a show stopper is the fact that the fake data
> blocks that would become the metadata blocks would lie out of any
> metadata group. I'm not familiar with the chunk rebuilder, but this
> seems as a simple check to do when it tries to guess the block group
> layout from what it finds on disk.

There's one more hurdle that looks tough to overcome: each metadata
block records the chunk tree UUID, and this piece of information is not
available to the user through ioctls, sysfs or ordinary data reads.
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