fuse_newnode
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);
ret = fuse_newnode(pu, path, va, &fi, pni, &pn);
ret = fuse_newnode(pu, path, va, NULL, pni, NULL);