Hello Chris

On 30.05.2011 21:03, Chris Mason wrote:
How big is the FS?
About 100 G on a 500 G partition. I would only like to recover some plain text files from it (source code),
I don't need the partition to be mountable again.

  What command did you use to overwrite the super
block?  Please try to tell us exactly which commands were run.
I had to install FreeBSD on that disk (with Linux, a btrfs partition, and several free partitions on it). When using the FreeBSD partition tool, I didn't create or delete any partitions. I only assigned a free partition to FreeBSD. When I booted later in Linux the Btrfs partition did not mount anymore.

There are other ways we can try to pull things off, but you should try
btrfsck -s 2 as well.
btrfcsk -s 2 exits with:

using SB copy 2, bytenr 274877906944
No valid Btrfs found on /dev/sda10



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