I've accidentally formatted one of my partitions with btrfs 0.19 filesystem, on 11.04, kernel 2.6.38-8-generic.
The command issued was:
mkfs.btrfs -L EADS-old /dev/sdd2.
After this I didn't write anything on this disk, it was only mounted few times. And the disk is obviously clean at a first glance.
How do I recover the data from it? It has quite a lot valuable data and I don't afford to backup the whole 1T of data.
I've tried testdisk program but I was unable to find any partitions nor usable data.