gjournaled UFS2 filesystem is gone after power outage

[Andrei Kolu]

I got power outage- UPS couldn't handle it this time- have to replace battery 
and now I can't read my filesystem that I made for testing purposes:

# mount /dev/ad0s4.journal /mnt/ad0s4/
mount: /dev/ad0s4.journal: Operation not permitted
# fsck /dev/ad0s4
fsck: Could not determine filesystem type

/var/log/messages:
Oct 26 19:28:01 PCBSD kernel: WARNING: R/W mount of /mnt/ad0s4 denied.  
Filesystem is not clean - run fsck
Oct 26 19:28:01 PCBSD kernel: WARNING: Expected rawoffset 0, found 113611680