Help with recover data

[Maxim Mikheev <mikhmv@gmail.com>]

Hi Everyone,

I recently decided to use btrfs. It works perfectly for a week even 
under heavy load. Yesterday I destroyed backups as cannot afford to have 
~10TB in backups. I decided to switch on Btrfs because it was announced 
that it stable already
I need to recover ~5TB data, this data is important and I do not have 
backups....


  uname -a
Linux s0 3.4.0-030400-generic #201205210521 SMP Mon May 21 09:22:02 UTC 
2012 x86_64 x86_64 x86_64 GNU/Linux

sudo mount -o recovery /dev/sdb /tank
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
        missing codepage or helper program, or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

dmesg:
[ 9612.971149] device fsid c9776e19-37eb-4f9c-bd6b-04e8dde97682 devid 2 
transid 9096 /dev/sdb
[ 9613.048476] btrfs: enabling auto recovery
[ 9613.048482] btrfs: disk space caching is enabled
[ 9621.172540] parent transid verify failed on 5468060241920 wanted 9096 
found 7621
[ 9621.181369] parent transid verify failed on 5468060241920 wanted 9096 
found 7621
[ 9621.182167] btrfs read error corrected: ino 1 off 5468060241920 (dev 
/dev/sdd sector 2143292648)
[ 9621.182181] Failed to read block groups: -5
[ 9621.193680] btrfs: open_ctree failed

sudo /usr/local/bin/btrfs-find-root /dev/sdb
...................................
Well block 4455562448896 seems great, but generation doesn't match, 
have=9092, want=9096
Well block 4455568302080 seems great, but generation doesn't match, 
have=9091, want=9096
Well block 4848395739136 seems great, but generation doesn't match, 
have=9093, want=9096
Well block 4923796594688 seems great, but generation doesn't match, 
have=9094, want=9096
Well block 4923798065152 seems great, but generation doesn't match, 
have=9095, want=9096
Found tree root at 5532762525696


$ sudo btrfs-restore -v -t 4923798065152 /dev/sdb ./
parent transid verify failed on 4923798065152 wanted 9096 found 9095
parent transid verify failed on 4923798065152 wanted 9096 found 9095
parent transid verify failed on 4923798065152 wanted 9096 found 9095
parent transid verify failed on 4923798065152 wanted 9096 found 9095
Ignoring transid failure
Root objectid is 5
Restoring ./Irina
Restoring ./Irina/.idmapdir2
Skipping existing file ./Irina/.idmapdir2/4.bucket.lock
If you wish to overwrite use the -o option to overwrite
Skipping existing file ./Irina/.idmapdir2/7.bucket
Skipping existing file ./Irina/.idmapdir2/15.bucket
Skipping existing file ./Irina/.idmapdir2/12.bucket.lock
Skipping existing file ./Irina/.idmapdir2/cap.txt
Skipping existing file ./Irina/.idmapdir2/5.bucket
Restoring ./Irina/.idmapdir2/10.bucket.lock
Restoring ./Irina/.idmapdir2/6.bucket.lock
Restoring ./Irina/.idmapdir2/8.bucket
ret is -3


  sudo btrfs-zero-log /dev/sdb
...........................
parent transid verify failed on 5468231311360 wanted 9096 found 7621
parent transid verify failed on 5468231311360 wanted 9096 found 7621
parent transid verify failed on 5468060102656 wanted 9096 found 7621
Ignoring transid failure
leaf parent key incorrect 59310080
btrfs-zero-log: extent-tree.c:2578: alloc_reserved_tree_block: Assertion 
`!(ret)' failed.

Help me please.....

Max