20080731: WAPBL (metadata journaling support) has been added, but at this time isn't backwards compatible with pre-WAPBL aware kernels and userland (fsck_ffs in particular). Please make sure you don't use a journaled filesystem with an older kernel/userland, especially an uncleanly mounted journaled filesystem. WAPBL also requires the super block to be in the UFS2 format. You can use fsck_ffs -c 4 to update the superblock format.
