Hello, 

It seems Btrfs Chunk Tree is damaged, so you can not mount Btrfs filesystem any 
more.

However, you can try the latest Btrfs-progs, Miao Xie implements chunk tree 
recover function.

The url is:

        git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git


you can try it:
                btrfs chunk-recover  -v <dev>

This is Time-consuming, because it will scan the whole disk. And also,
please catch output of processing(this is helpful to us if the recovery fails, 
-v option
enable this).

Thanks,
Wang






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