ufs_badblock
ASSERT(!ufs_badblock(ip, bno));
ASSERT(!ufs_badblock(ip, nb));
ASSERT(!ufs_badblock(ip, nb));
ASSERT(!ufs_badblock(ip, nb));
ASSERT(!ufs_badblock(ip, nb));
ASSERT(!ufs_badblock(ip, nb));
if (bap[i] != 0 && (err = ufs_badblock(ip, bap[i])))
extern int ufs_badblock(struct inode *, daddr_t);