uint8_t magic[4]; /* magic identifier */0-3 uint16_t major_ver; /* major FS version */4-5 uint16_t minor_ver; /* minor FS version */6-7 uint32_t sb_age; /* superblock age */8-11 uint32_t nblocks; /* total number of blocks */12-15 uint32_t bitmap_offset; /* block offset of bitmap */16-19 uint32_t itable_offset[SFS_NTABLES]; /* block offsets of inode tables */20-83 uint32_t itable_length[SFS_NTABLES]; /* lengths (in blocks) of inode tables */84 - 147 uint32_t itotal; /* total number of inodes */148-151 uint32_t iused; /* number of used inodes */152-155 uint32_t root_inode; /* inode number of the root directory */ 156-159