nilfs_super_root
struct nilfs_super_root super_root;
((uint32_t)&((struct nilfs_super_root *)0)->sr_dat + \
#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
struct nilfs_super_root super_root;
struct nilfs_super_root *super_root;
size = sizeof(struct nilfs_super_root);