ref: babf901b4a508c3ec5d1f89655f10377bbdf9637
dir: /os/boot/pc/dosfs.h/
typedef struct Dosboot Dosboot;
typedef struct Dos Dos;
typedef struct Dosdir Dosdir;
typedef struct Dosfile Dosfile;
typedef struct Dospart Dospart;
struct Dospart
{
uchar flag; /* active flag */
uchar shead; /* starting head */
uchar scs[2]; /* starting cylinder/sector */
uchar type; /* partition type */
uchar ehead; /* ending head */
uchar ecs[2]; /* ending cylinder/sector */
uchar start[4]; /* starting sector */
uchar len[4]; /* length in sectors */
};
#define FAT12 0x01
#define FAT16 0x04
#define EXTEND 0x05
#define FATHUGE 0x06
#define FAT32 0x0b
#define FAT32X 0x0c
#define EXTHUGE 0x0f
#define DMDDO 0x54
#define PLAN9 0x39
#define LEXTEND 0x85
struct Dosfile{
Dos *dos; /* owning dos file system */
char name[8];
char ext[3];
uchar attr;
long length;
long pstart; /* physical start cluster address */
long pcurrent; /* physical current cluster address */
long lcurrent; /* logical current cluster address */
long offset;
};
struct Dos{
long start; /* start of file system */
int sectsize; /* in bytes */
int clustsize; /* in sectors */
int clustbytes; /* in bytes */
int nresrv; /* sectors */
int nfats; /* usually 2 */
int rootsize; /* number of entries */
int volsize; /* in sectors */
int mediadesc;
int fatsize; /* in sectors */
int fatclusters;
int fatbits; /* 12 or 16 */
long fataddr; /* sector number */
long rootaddr;
long rootclust;
long dataaddr;
long freeptr;
};
extern int dosinit(Fs*);