tmpfs_hash_lookup
if (tmpfs_hash_lookup(name, parent, 1, foundtp) != NULL) {
tdp = tmpfs_hash_lookup(name, dir, 1, &found);
tpdp = tmpfs_hash_lookup(nm, dir, 0, &tnp);
tdp = tmpfs_hash_lookup("..", toparent, 1, &dotdot);
dotdot = tmpfs_hash_lookup("..", fromtp, 0, NULL);