xsfs.h

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// eXtendable Stream-based File System

#ifndef __XSFS_H
#define __XSFS_H

#include <knldefs.h>

#ifdef _MSC_VER
#pragma pack(push, 1)
#endif

typedef struct _XSFSDESC
{
	_u32 version;			// FileSystem version
	_u16 sector_size;		// Physical sector size
	_u16 n_scale;			// Logical allocating unit size
	_u32 n_sectors;			// Total sectors
	_u32 n_units;			// Total logical units
	_u16 n_reserved;		// Reserved sectors
	_u16 n_ss_desc;			// Number of sectors of System Streams Descriptor
	_u16 n_bitmap;			// Number of units of Allocating Bitmap
	_u16 pad;
} XSFSDESC;

#define MAX_PRI_INDEX	12
#define MAX_SEC_INDEX	3
typedef struct _XSFSSTREAM
{
	_u32 flags;
	_u32 pri_index[MAX_PRI_INDEX];
	_u32 sec_index[MAX_SEC_INDEX];
} XSFSSTREAM;

typedef struct _XSFSIMAGE	// image in boot sector
{
	char jmps[3], signature[9];
	XSFSDESC descriptor;
	_u32 reserved[8];
} XSFSIMAGE;

#ifdef _MSC_VER
#pragma pack(pop)
#endif

// XSFS device image description
// Partition Image:
//      ReservedSectors		BootSector
//							BootLoader
//		SystemStreamsDescriptor
//		DataArea			AllocatingBitmap
//							SystemStreams
// Notes:
//      Logical unit index 0 starts at DataArea.  That means Allocating Bitmap
// occupies the 0 unit, and index 0 then can be used as null-reference

// Reserved system stream index
#define SSI_BITMAP		0
#define SSI_BITMAPHASH	1
#define SSI_FSTREE		2

#endif