[PROBLEM] Mounting of Backup Image-File not possible

[suhm]

Hi,

i've destroyed my root file system on my xbian and want just to rollback to my last snapshot,
so i cannot access and i dont know the name of it anymore (@ and @last_good_known arealso destroyed)

ive just tried to access my sd card, so its not possible to mount the btrfs filesystem it says:

Terminal

btrfs: disk space caching is enabled
BTRFS: couldn't mount because of unsupported optional features (10).
btrfs: open_ctree failed

so its maybe a unpatched kernel problem or somting else?

anyways.. now i've tried to mount it on a xbian system as an *.img File and got this errors:

Terminal

# Mounted an extern USB HDD with the xbian image on my flesh xbian installattion
root@xbian:~# modprobe loop
root@xbian:~# ./md.sh /media/usbextern/xbianbackup.img
/media/usbextern/xbianbackup.img1 2048 71679 69632 34M b W95 FAT32
/media/usbextern/xbianbackup.img2 141312 15257599 15116288 7.2G 83 Linux
/media/usbextern/xbianbackup.img3 15257600 15759359 501760 245M 82 Linux swap / Solaris

root@xbian:~# mount -v -t btrfs -o loop,ro,offset=72351744 /media/usbextern/xbianbackup.img /mnt
mount: /dev/loop1 is already mounted or /mnt busy

root@xbian:~# mount -v -t auto -o loop,ro,offset=72351744 /media/usbextern/xbianbackup.img /
mount: /dev/loop1 is already mounted or / busy
/dev/loop1 is already mounted on /
/dev/loop1 is already mounted on /home
/dev/loop1 is already mounted on /lib/modules
/dev/loop1 is already mounted on /xbmc-backup

at this point i have no idea to get this work here. so im happy for any help. thanks!

suhm