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typedef struct Dosboot	Dosboot;
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typedef struct Dos	Dos;
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typedef struct Dosdir	Dosdir;
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typedef struct Dosfile	Dosfile;
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typedef struct Dospart	Dospart;
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typedef struct File File;
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typedef struct Bootfs Bootfs;
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int fsread(File *file, void *a, long n);
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int fsboot(Bootfs *fs, char *path, Boot *b);
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int fswalk(Bootfs *fs, char *path, File *f);
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struct Dospart
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{
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	uchar flag;		/* active flag */
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	uchar shead;		/* starting head */
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	uchar scs[2];		/* starting cylinder/sector */
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	uchar type;		/* partition type */
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	uchar ehead;		/* ending head */
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	uchar ecs[2];		/* ending cylinder/sector */
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	uchar start[4];		/* starting sector */
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	uchar len[4];		/* length in sectors */
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};
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#define FAT12	0x01
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#define FAT16	0x04
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#define EXTEND	0x05
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#define FATHUGE	0x06
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#define FAT32	0x0b
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#define FAT32X	0x0c
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#define EXTHUGE	0x0f
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#define DMDDO	0x54
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#define PLAN9	0x39
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#define LEXTEND 0x85
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struct Dosfile{
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	Dos	*dos;		/* owning dos file system */
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	char	name[8];
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	char	ext[3];
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	uchar	attr;
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	long	length;
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	long	pstart;		/* physical start cluster address */
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	long	pcurrent;	/* physical current cluster address */
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	long	lcurrent;	/* logical current cluster address */
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	long	offset;
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};
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struct Dos{
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	long	start;		/* start of file system */
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	int	sectsize;	/* in bytes */
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	int	clustsize;	/* in sectors */
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	int	clustbytes;	/* in bytes */
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	int	nresrv;		/* sectors */
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	int	nfats;		/* usually 2 */
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	int	rootsize;	/* number of entries */
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	int	volsize;	/* in sectors */
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	int	mediadesc;
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	int	fatsize;	/* in sectors */
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	int	fatclusters;
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	int	fatbits;	/* 12 or 16 */
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	long	fataddr;	/* sector number */
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	long	rootaddr;
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	long	rootclust;
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	long	dataaddr;
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	long	freeptr;
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};
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typedef struct Dosboot Dosboot;
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typedef struct Dosdir Dosdir;
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struct Dosboot{
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	uchar	magic[3];
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	uchar	version[8];
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	uchar	sectsize[2];
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	uchar	clustsize;
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	uchar	nresrv[2];
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	uchar	nfats;
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	uchar	rootsize[2];
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	uchar	volsize[2];
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	uchar	mediadesc;
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	uchar	fatsize[2];
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	uchar	trksize[2];
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	uchar	nheads[2];
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	uchar	nhidden[4];
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	uchar	bigvolsize[4];
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/* fat 32 */
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	uchar	bigfatsize[4];
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	uchar	extflags[2];
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	uchar	fsversion[2];
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	uchar	rootdirstartclust[4];
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	uchar	fsinfosect[2];
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	uchar	backupbootsect[2];
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/* ???
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	uchar	driveno;
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	uchar	reserved0;
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	uchar	bootsig;
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	uchar	volid[4];
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	uchar	label[11];
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	uchar	reserved1[8];
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*/
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};
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struct Dosdir{
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	uchar	name[8];
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	uchar	ext[3];
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	uchar	attr;
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	uchar	lowercase;
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	uchar	hundredth;
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	uchar	ctime[2];
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	uchar	cdate[2];
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	uchar	adate[2];
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	uchar	highstart[2];
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	uchar	mtime[2];
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	uchar	mdate[2];
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	uchar	start[2];
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	uchar	length[4];
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};
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#define	DOSRONLY	0x01
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#define	DOSHIDDEN	0x02
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#define	DOSSYSTEM	0x04
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#define	DOSVLABEL	0x08
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#define	DOSDIR	0x10
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#define	DOSARCH	0x20
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// #pragma incomplete Bootfs
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struct File{
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	union{
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		Dosfile	dos;
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		int walked;
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	};
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	Bootfs	*fs;
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	char	*path;
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};
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struct Bootfs{
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	union {
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		Dos dos;
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	};
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	Chan	*devch;
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	char	*disk;
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	/* for *bios.c */
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	int	dev;				/* device id */
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	long	(*diskread)(Bootfs*, void*, long);	/* disk read routine */
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	vlong	(*diskseek)(Bootfs*, vlong);	/* disk seek routine */
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	long	(*read)(File*, void*, long);
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	int	(*walk)(File*, char*);
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	File	root;
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};
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extern int	dosinit(Bootfs*, char *);
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#define BADPTR(x) ((ulong)(x) < 0x80000000)