filename_mkdirat
return filename_mkdirat(AT_FDCWD, name, mode);
int filename_mkdirat(int dfd, struct filename *name, umode_t mode);
return filename_mkdirat(dfd, name, mode);
return filename_mkdirat(AT_FDCWD, name, mode);
ret = filename_mkdirat(mkd->dfd, name, mkd->mode);