[SOLVED] After updating yesterday...

[Nachteule]

(16th Aug, 2016 02:12 AM)duno Wrote:  BTRFS: bad superblock - solved

Please mark as solved.

Really good news

Quote:I bought another SD-Card, because my PI3 will not boot with Xbian as it do with Ubuntu or Raspbian.

Maybe my fault ... will try to figure out that later.

Good decision

Quote:What i have done:

I downloaded

Code:

XBian_2016.08.05_rpi.img.gz

Code:

XBian_2016.08.12_rpi.img.gz

Tried both images via dd to the SD-Card, not booting.

Is this typo or did you tried an image for RPi1 running on an RPi2 or 3?

This can not work (Kernel is too different)

Quote:Then i found my old one, XBian_preliminary_rpi3.img.gz.

Dumped it to the SD-Card and the PI2 was booting.

After that i connected the PI2 with a Multi-Card-Reader (incl. the "broken" SD-Card) and then i connected via ssh.

Code:

uname -a
Linux xbian 4.4.3+ #2 SMP Thu Mar 3 18:44:04 CET 2016 armv7l GNU/Linux

Code:

sudo btrfs-show-super /dev/sda2
...

Code:

sudo btrfs-show-super -a /dev/sda2
...

Code:

sudo btrfsck -s 1 /dev/sda2
using SB copy 1, bytenr 67108864
Checking filesystem on /dev/sda2
UUID: 2dcbf32f-7a95-41ff-bf52-65d5b4f547a5
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 2153108657 bytes used err is 0
total csum bytes: 5325724
total tree bytes: 217186304
total fs tree bytes: 191053824
total extent tree bytes: 18137088
btree space waste bytes: 41469442
file data blocks allocated: 7247892480
referenced 6437621760
Btrfs v3.16-4-ga81918d-dirty

Code:

sudo apt-get install btrfs-tools

Restoring the matching superblock

Code:

sudo btrfs-select-super -s 1 /dev/sda2
ERROR: superblock checksum mismatch
using SB copy 1, bytenr 67108864

Code:

sudo mount /dev/sda2 /mnt

After that i was able to copy (backup) all the files from /mnt that i need.

But, the greatest success is, the PI2 is booting again from the "broken" SD-Card after restoring the superblock

BTW. As i have seen, last Kernel was 4.14+ (last_good_known) and not 4.15+ when i upgraded to 4.16+

Hmmm, very interesting. So btrfs tool running on a RPi2 was able to repair damaged fs, and ubuntu was not able to do this, very strange.

Quote:Btrfs v3.16-4-ga81918d-dirty[

I`m only a bit confused about the version number of btrfs tools. On debian there is 3.17, and ahh, hold on, on our repo there is 3.16 in stable and 4.3 in staging