Comment # 7 on bug 964969 from Ulrich Windl

When trying a "btrfs rescue super-recover ..." from the rescue system, I get:
Superblock bytenr is larger than device size
Usage or syntax errors

Then I see a segfault of btrfs use process.

Likewise "chunk-recover" produces:
read superblock error
recover prepare error
Fail to recover the chunk tree.

Eventually I tries a "zero-log" on the device which succeeded. Unfortunately
even after that I get the same message as in comment 4, and any attempt for
"filesystem balance" just gives "No space left on device".

Next thing I tried was "filesystem defragment" which succeeded, but didn't free
up any space for balance.

As I had some space left on the VG, I resized the 16GB lvol to 18 GB, and then
I could rebalance!

To summarize: BTRFS and it tools have to go back to the drawing board for a
re-design!