Filesystem "somewhat" destroyed - need help for recovery/fixing

[Alexander Skwar <alexanders.mailinglists+nospam@gmail.com>]

Hello

I think, I somewhat destroyed my btrfs filesystem on my Ubuntu 13.04 kernel 
3.8.0-25-lowlatency system. It got destroyed, because the system was hanging 
for some other reason and I had to remove power...

When I try to mount my filesystem (there's only one, with a few 
subfilesystems), the system crashes. Also btrfsck dies; always like this:

a@ask-home:~$ sudo /btrfs-progs.dev/bin/btrfsck /dev/ssd/Data 
parent transid verify failed on 33327525888 wanted 53973 found 53972
parent transid verify failed on 33327525888 wanted 53973 found 53972
Ignoring transid failure
Checking filesystem on /dev/ssd/Data
UUID: 7d2eb10f-aced-4d41-bb7f-7badbf075b6a
checking extents
checking fs roots
root 325 inode 31590 errors 400
extent buffer leak: start 33327525888 len 4096
*** Error in `btrfs check': corrupted double-linked list: 0x00000000007a2600 
***

a@ask-home:~$ /btrfs-progs.dev/bin/btrfs version
Btrfs v0.20-rc1-253-g7854c8b-dirty

btrfsck always dies with a corrupted double-linked list.

When the system crashes when I try to mount the filesystem, I get a kernel 
oop. Nothing in syslog, though - too fast :/ On 
http://wir.myds.me/photo/photo_thumb.php?
dir=53637265656e73686f74732f4372617368206d6f756e74206274726673 or 
http://imgur.com/a/UA7fF I tried to capute a few photos of the crash 
message. "Screenshots", of sorts...

I was able to recover most of the files with btrfs-recover. But not all of 
it correctly - at least one VirtualBox image is now broken.

Well - what do I do now? Could someone help, please?


Thanks a lot,
Alexander