disk_sm_root
struct disk_sm_root smr;
if (len < sizeof(struct disk_sm_root)) {
struct disk_sm_root *smr = root_le;
if (len < sizeof(struct disk_sm_root)) {
*result = sizeof(struct disk_sm_root);
struct disk_sm_root root_le;
*result = sizeof(struct disk_sm_root);
struct disk_sm_root root_le;