enum
{
	SUPERMAGIC	= 0x4D49534348494546ULL,

	BBLANK 		= 0,
	BSUPER,
};

typedef struct Fs Fs;
typedef struct BlockRun BlockRun;
typedef struct SuperBlock SuperBlock;

struct Fs
{
	RWLock;
};

struct BlockRun
{
	u32int 	ag;
	u16int	start;
	u16int	len;
};

struct SuperBlock
{
	char		label[128];
	u64int		magic;

	u32int		block_size;
	u32int		block_shift;

	u64int		num_blocks;
	u64int		used_blocks;

	BlockRun	log_run;
	u64int		log_start;
	u64int		log_end;
};

/* super.c */
int checksuper(SuperBlock *super);
int getsuper(int fd, SuperBlock *super);
int putsuper(int fd, SuperBlock *super);