APPLEUFS_LABEL_OFFSET
daddr_t label = APPLEUFS_LABEL_OFFSET / dev_bsize;
wtfs(APPLEUFS_LABEL_OFFSET/sectorsize,
rdfs(APPLEUFS_LABEL_OFFSET/sectorsize,
wtfs(APPLEUFS_LABEL_OFFSET/sectorsize,
daddr_t blkno = APPLEUFS_LABEL_OFFSET / DEV_BSIZE;