POWEROF2
if (!POWEROF2(sblock.fs_bsize)) {
if (!POWEROF2(sblock.fs_fsize)) {
if (maxbsize < bsize || !POWEROF2(maxbsize)) {
if (!POWEROF2(sblock.fs_bsize)) {
if (!POWEROF2(sblock.fs_fsize)) {
if (maxbsize < bsize || !POWEROF2(maxbsize)) {