uffs_public.h

flash管理算法

/*
    Copyright (C) 2005-2008  Ricky Zheng <[e-mail]>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*/
/** 
 * \file uffs_public.h
 * \brief public data structures for uffs
 * \author Ricky Zheng
 */

#ifndef UFFS_PUBLIC_H
#define UFFS_PUBLIC_H

#include "uffs/uffs_types.h"
#include "uffs/uffs_config.h"
#include "uffs/uffs_core.h"
#include "uffs/uffs.h"

#ifdef __cplusplus
extern "C"{
#endif


/** 
 * \struct uffs_TagsSt
 * \note size: 12 bytes, small enough to be embedded into the 'spare' of NAND flash page.
 *			Although this struct is designed as close as the NAND flash spare, it is *NOT*
 *          the physical map of NAND flash page's 'spare'!! It's "Logical Spare".
 *	\see Logic Spare <--> Physical Spare : uffs_FlashOps->LoadPageSpare,->WritePageSpare
 */
struct uffs_TagsSt {
	u8 dirty:1;				//!< 0: dirty, 1: clear
	u8 valid:1;				//!< 0: valid, 1: invalid
	u8 type:4;				//!< block type: #UFFS_TYPE_DIR, #UFFS_TYPE_FILE, #UFFS_TYPE_DATA or #UFFS_TYPE_RESV
	u8 blockTimeStamp:2;	//!< time stamp of block;

	u8 pageID;				//!< page id
	u16 father;				//!< father's serial number
	u16 serial;				//!< serial number

	u16 dataLength;			//!< length of page data length
	u16 dataSum;			//!< sum of file name or directory name
#if defined(ENABLE_TAG_CHECKSUM) && ENABLE_TAG_CHECKSUM == 1
	u8 checkSum;			//!< checksum of above, or ecc of tag...
#endif
	u8 blockStatus;			//!< block status, this byte is loaded from flash, but not write to flash directly

};

/*
New tag: ecc embedded
struct uffs_TagsSt {
//0:
	u8 dirty:1;				//!< 0: dirty, 1: clear
	u8 valid:1;				//!< 0: valid, 1: invalid
	u8 type:4;				//!< block type: #UFFS_TYPE_DIR, #UFFS_TYPE_FILE, #UFFS_TYPE_DATA or #UFFS_TYPE_RESV
	u8 blockTimeStamp:2;	//!< time stamp of block;
//1:
	u8 dataSum;				//!< sum of file name or directory name, or ... ?
//2:
	u16 father;				//!< father's serial number
	u16 serial;				//!< serial number
//6:	
	u16 dataLength;			//!< length of page data: maximum 64K bytes
//8:
#if NAND_PAGE_DATASIZE == 512
	u8 ecc[6];				//!< ecc for 512 page size
#elseif NAND_PAGE_DATASIZE == 1024
	u8 ecc[12];				//!< ecc for 1K page size
#elseif NAND_PAGE_DATASIZE == 2048
	u8 ecc[24];				//!< ecc for 2K page size
#endif
	u8 pageID;				//!< maximum 256 pages in a block

	u8 blockStatus;			//!< block status, this byte is loaded from flash, but not write to flash directly !

}

*/



/** uffs_TagsSt.dirty */
#define TAG_VALID		0
#define TAG_INVALID		1

/** uffs_TagsSt.valid */
#define TAG_DIRTY		0
#define TAG_CLEAR		1


int uffs_GetFirstBlockTimeStamp(void);
int uffs_GetNextBlockTimeStamp(int prev);
UBOOL uffs_IsSrcNewerThanObj(int src, int obj);


#include "uffs_device.h"

/********************* uffs disk and partition ***************************/

#define UFFS_DISK_MARK				0x53464655	//'UFFS'
#define UFFS_DISK_INFO_SIZE			64
#define UFFS_PARTITION_INFO_SIZE	32

//PHICICAL storage
//uffs disk information residents on first block of NAND flash
//Assume that NAND flash's first block is always good.
struct uffs_DiskInfoSt {
	u32 uffs_mark;		//!< will be 'UFFS', value: 0x53464655
	u32 version;		//!< uffs version
	u32 reserved[16];	//!< reserved
	u32 status;			//!< uffs status
	u32 partitions;		//!< partition nums
	u32 alternate;		//!< diskinfo alternate block
};

struct uffs_PartitionInfoSt {
	u32 status;				//partition status
	u32 createTime;			//create time
	u32 lastModified;		//last modified time
	u32 block_begin;		//partition begin block
	u32 block_end;			//partition end block
	u32 access;				//access mask
};


struct uffs_StorageSt {
	int mainBlock;
	struct uffs_DiskInfoSt main;
	int partsNum;
	struct uffs_PartitionInfoSt *parts;
};


typedef struct uffs_mountTableSt {
	uffs_Device *dev;
	int startBlock;
	int endBlock;
	const char *mountPoint;
	struct uffs_mountTableSt *next;
} uffs_mountTable;


/********************************** debug & error *************************************/
#define UFFS_ERR_NOISY		-1
#define UFFS_ERR_NORMAL		0
#define UFFS_ERR_SERIOUS	1
#define UFFS_ERR_DEAD		2

//#define UFFS_DBG_LEVEL	UFFS_ERR_NORMAL	
#define UFFS_DBG_LEVEL	UFFS_ERR_NOISY	

void uffs_Perror( int level, const char *errFmt, ... );

/********************************** NAND **********************************************/
//NAND flash specific file must implement these interface
URET uffs_LoadPageSpare(uffs_Device *dev, int block, int page, uffs_Tags *tag);
URET uffs_WritePageSpare(uffs_Device *dev, int block, int page, uffs_Tags *tag);
URET uffs_MakePageValid(uffs_Device *dev, int block, int page, uffs_Tags *tag);
UBOOL uffs_IsBlockBad(uffs_Device *dev, uffs_blockInfo *bc);

/********************************** Public defines *****************************/
/**
 * \def UFFS_ALL_PAGES 
 * \brief UFFS_ALL_PAGES if this value presented, that means the objects are all pages in the block
 */
#define UFFS_ALL_PAGES (0xffff)

/** 
 * \def UFFS_INVALID_PAGE
 * \brief macro for invalid page number
 */
#define UFFS_INVALID_PAGE	(0xfffe)
#define UFFS_INVALID_BLOCK	(0xfffe)

#define UFFS_INVALID_SERIAL 0xffff


URET uffs_NewBlock(uffs_Device *dev, u16 block, uffs_Tags *tag, uffs_Buf *buf);
URET uffs_BlockRecover(uffs_Device *dev, uffs_blockInfo *old, u16 newBlock);
URET uffs_PageRecover(uffs_Device *dev, 
					  uffs_blockInfo *bc, 
					  u16 oldPage, 
					  u16 newPage, 
					  uffs_Buf *buf);
int uffs_FindFreePageInBlock(uffs_Device *dev, uffs_blockInfo *bc);
u8 uffs_CalTagCheckSum(uffs_Tags *tag);
u16 uffs_FindBestPageInBlock(uffs_Device *dev, uffs_blockInfo *bc, u16 page);
u16 uffs_FindFirstValidPage(uffs_Device *dev, uffs_blockInfo *bc);
u16 uffs_FindFirstFreePage(uffs_Device *dev, uffs_blockInfo *bc, u16 pageFrom);
u16 uffs_FindPageInBlockWithPageId(uffs_Device *dev, uffs_blockInfo *bc, u16 pageID);

u8 uffs_MakeSum8(void *p, int len);
u16 uffs_MakeSum16(void *p, int len);
URET uffs_CreateNewFile(uffs_Device *dev, u16 father, u16 serial, uffs_blockInfo *bc, uffs_fileInfo *fi);

int uffs_GetBlockFileDataLength(uffs_Device *dev, uffs_blockInfo *bc, u8 type);
UBOOL uffs_IsPageErased(uffs_Device *dev, uffs_blockInfo *bc, u16 page);
int uffs_GetFreePagesCount(uffs_Device *dev, uffs_blockInfo *bc);
UBOOL uffs_IsDataBlockReguFull(uffs_Device *dev, uffs_blockInfo *bc);

int uffs_GetBlockTimeStamp(uffs_Device *dev, uffs_blockInfo *bc);

URET uffs_WriteDataToNewPage(uffs_Device *dev, 
							 u16 block, 
							 u16 page,
							 uffs_Tags *tag,
							 uffs_Buf *buf);


int uffs_GetDeviceUsed(uffs_Device *dev);
int uffs_GetDeviceFree(uffs_Device *dev);
int uffs_GetDeviceTotal(uffs_Device *dev);




/************************************************************************/
/*  init functions                                                                     */
/************************************************************************/
URET uffs_InitDevice(uffs_Device *dev);
URET uffs_ReleaseDevice(uffs_Device *dev);

URET uffs_initMountTable(void);
URET uffs_releaseMountTable(void);

URET uffs_InitFlashClass(uffs_Device *dev);

uffs_mountTable * uffs_GetMountTable(void);
int uffs_RegisterMountTable(uffs_mountTable *mtab);


#ifdef __cplusplus
}
#endif
#endif