dircheck
if (dircheck(idesc, dp))
dircheck(idesc, ndp) == 0) {
int dircheck(struct inodesc *, struct ext2fs_direct *);
if (dircheck(idesc, dp, bp))
dircheck(idesc, ndp, bp) == 0) {
static int dircheck(struct inodesc *, struct direct *, struct bufarea *);
if (dircheck(idesc, dp))
dircheck(idesc, ndp) == 0) {
int dircheck(struct inodesc *, union lfs_dirheader *);