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/*
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 *	Journal Based Flash Entrysystem.
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 */
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enum
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{
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// sector header
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	MAGSIZE		= 4,
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	MAXHDR		= MAGSIZE+3+3,
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	MAGIC0		= 'R',
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	MAGIC1		= 'O',
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	MAGIC2		= 'O',
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	FFSVERS		= '0',
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// transactions
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	FT_create	= 'G',
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	FT_FCREATE0	= 'C',
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	FT_FCREATE1	= 'E',
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	FT_DCREATE0	= 'D',
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	FT_DCREATE1	= 'F',
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	FT_chmod	= 'H',
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	FT_CHMOD0	= 'M',
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	FT_CHMOD1	= 'O',
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	FT_REMOVE	= 'R',
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	FT_WRITE	= 'W',
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	FT_AWRITE	= 'A',
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	FT_trunc	= 'I',
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	FT_TRUNC0	= 'T',
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	FT_TRUNC1	= 'V',
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	FT_SUMMARY	= 'S',
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	FT_SUMBEG	= 'B',
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	FT_SUMEND	= 'Z',
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	MAXFSIZE	= 1 << 21,
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	MAXNSIZE	= 28,
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	Ncreate		= 1+1+3*3+MAXNSIZE+1,
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	Nchmod		= 1+1+2*3,
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	Nremove		= 1+3,
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	Nwrite		= 1+4*3,
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	Ntrunc		= 1+1+4*3+MAXNSIZE+1,
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	Nsumbeg		= 1+3,
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	Nmax		= Ncreate,
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	Nsum		= 2*(1+3),
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	Nfree		= 3,
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	HBITS		= 5,
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	HSIZE		= 1 << HBITS,
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	HMASK		= HSIZE - 1,
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	NOTIME		= 0xFFFFFFFF,
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	WRSIZE		= 4*1024,
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};
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typedef	struct	Extent	Extent;
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typedef	struct	Exts	Exts;
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typedef	struct	Entry	Entry;
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typedef	struct	Dirr	Dirr;
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typedef struct	Jrec	Jrec;
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typedef struct	Renum	Renum;
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struct Extent
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{
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	int	sect;
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	ulong	addr;
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	ulong	off;
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	ulong	size;
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	Extent*	next;
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	Extent*	prev;
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};
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struct Exts
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{
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	Extent*	head;
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	Extent*	tail;
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};
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struct Entry
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{
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	int	ref;
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	char*	name;
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	ulong	fnum;
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	ulong	mode;
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	ulong	mnum;
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	ulong	mtime;
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	ulong	size;
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	union
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	{
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		struct
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		{
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			Entry**	htab;
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			Entry*	files;
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			Dirr*	readers;
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		};
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		struct
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		{
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			Exts	gen[2];
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		};
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	};
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	Entry*	parent;
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	Entry*	hnext;
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	Entry*	hprev;
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	Entry*	fnext;
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	Entry*	fprev;
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};
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struct Dirr
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{
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	Entry*	dir;
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	Entry*	cur;
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	Dirr*	next;
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	Dirr*	prev;
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	ulong	offset;
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};
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struct Jrec
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{
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	int	type;
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	ulong	mode;
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	ulong	fnum;
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	ulong	mnum;
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	ulong	tnum;
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	ulong	mtime;
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	ulong	parent;
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	ulong	size;
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	ulong	offset;
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	ulong	seq;
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	char	name[MAXNSIZE+2];
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};
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struct Renum
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{
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	int	old;
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	int	new;
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};
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extern	void	initdata(char*, int);
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extern	void	clearsect(int);
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extern	void	readdata(int, void*, ulong, ulong);
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extern	int	writedata(int, int, void*, ulong, ulong);
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extern	int	getc3(uchar*, ulong*);
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extern	int	putc3(uchar*, ulong);
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extern	ulong	get4(uchar*);
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extern	void	put4(uchar*, ulong);
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extern	int	convM2J(Jrec*, uchar*);
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extern	int	convJ2M(Jrec*, uchar*);
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extern	void	loadfs(int);
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extern	char*	need(int bytes);
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extern	void	put(Jrec*, int);
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extern	void	putw(Jrec*, int, Extent *x, void*);
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extern	int	Jconv(Fmt*);
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extern	ulong	now(void);
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extern	void	serve(char*);
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#pragma	varargck	type	"J"	Jrec*
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extern	void	einit(void);
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extern	void	edump(void);
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extern	Entry*	elookup(ulong);
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extern	Extent*	esum(Entry*, int, ulong, int*);
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extern	void	edestroy(Entry*);
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extern	Entry*	ecreate(Entry*, char*, ulong, ulong, ulong, char**);
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extern	char*	eremove(Entry*);
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extern	Entry*	ewalk(Entry*, char*, char**);
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extern	void	etrunc(Entry*, ulong, ulong);
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extern	ulong	echmod(Entry*, ulong, ulong);
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extern	ulong	eread(Entry*, int, void*, ulong, ulong);
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extern	void	ewrite(Entry*, Extent *, int, ulong);
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extern	Qid	eqid(Entry*);
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extern	void	estat(Entry*, Dir*, int);
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extern	Dirr*	ediropen(Entry*);
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extern	int	edirread(Dirr*, char*, long);
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extern	void	edirclose(Dirr*);
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extern	void	erenum(Renum*);
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extern	char	Edirnotempty[];
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extern	char	Eexists[];
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extern	char	Eisdir[];
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extern	char	Enonexist[];
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extern	char	Enotdir[];
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extern	char	Eperm[];
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extern	char	Erofs[];
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extern	ulong	sectsize;
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extern	ulong	nsects;
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extern	uchar*	sectbuff;
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extern	Entry	*root;
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extern	int	readonly;
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extern	ulong	delta;
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extern	int	eparity;
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extern	uchar	magic[];
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extern	ulong	used;
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extern	ulong	limit;
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extern	ulong	maxwrite;