/*
 * exportfs.h - definitions for exporting file server
 */

#define DEBUG		if(!dbg);else fprint
#define MAXPROC		16
#define DIRCHUNK	(50*DIRLEN)
#define FHASHSIZE	64
#define fidhash(s)	fhash[s%FHASHSIZE]

typedef struct Fsrpc Fsrpc;
typedef struct Fid Fid;
typedef struct File File;
typedef struct Proc Proc;

struct Fsrpc
{
	int	busy;			/* Work buffer has pending rpc to service */
	int	pid;			/* Pid of slave process executing the rpc */
	int	canint;			/* Interrupt gate */
	int	flushtag;		/* Tag on which to reply to flush */
	Fcall	work;			/* Plan 9 incoming Fcall */
	char	buf[MAXFDATA+MAXMSG];	/* Data buffer */
};

struct Fid
{
	int	fid;			/* system fd for i/o */
	int	offset;			/* current file offset */
	File	*f;			/* File attached to this fid */
	int	mode;
	int	nr;			/* fid number */
	Fid	*next;			/* hash link */
};

struct File
{
	char	name[NAMELEN];
	Qid	qid;
	File	*parent;
	File	*child;
	File	*childlist;
};

struct Proc
{
	int	pid;
	int	busy;
	Proc	*next;
};

enum
{
	Nr_workbufs 	= 16,
	Dsegpad		= 8192,
	Fidchunk	= 1000,
};

enum
{
	Ebadfid,
	Enotdir,
	Edupfid,
	Eopen,
	Exmnt,
	Enoauth,
};

Extern Fsrpc	*Workq;
Extern int  	dbg;
Extern File	*root;
Extern Fid	**fhash;
Extern Fid	*fidfree;
Extern int	qid;
Extern Proc	*Proclist;

/* File system protocol service procedures */
void Xattach(Fsrpc*);
void Xauth(Fsrpc*);
void Xclone(Fsrpc*);
void Xclunk(Fsrpc*); 
void Xclwalk(Fsrpc*);
void Xcreate(Fsrpc*);
void Xflush(Fsrpc*); 
void Xnop(Fsrpc*);
void Xremove(Fsrpc*);
void Xsession(Fsrpc*);
void Xstat(Fsrpc*);
void Xwalk(Fsrpc*);
void Xwstat(Fsrpc*);
void slave(Fsrpc*);

void	reply(Fcall*, Fcall*, char*);
Fid 	*getfid(int);
int	freefid(int);
Fid	*newfid(int);
Fsrpc	*getsbuf(void);
void	initroot(void);
void	fatal(char*);
void	makepath(char*, File*, char*);
File	*file(File*, char*);
void	slaveopen(Fsrpc*);
void	slaveread(Fsrpc*);
void	slavewrite(Fsrpc*);
void	blockingslave(void);
void	reopen(Fid *f);
void	fileseek(Fid*, ulong);
void	noteproc(int, char*);
void	flushaction(void*, char*);
void	pushfcall(char*);