/* * YAFFS: Yet another FFS. A NAND-flash specific file system.  * yaffs_guts.h: Configuration etc for yaffs_guts * * Copyright (C) 2002 Aleph One Ltd. *   for Toby Churchill Ltd and Brightstar Engineering * * Created by Charles Manning <charles@aleph1.co.uk> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 2.1 as * published by the Free Software Foundation. * * * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. * * $Id: yaffs_guts.h,v 1.18 2004/10/20 20:12:43 charles Exp $ */#ifndef __YAFFS_GUTS_H__#define __YAFFS_GUTS_H__#include "yportenv.h"#define YAFFS_OK	1#define YAFFS_FAIL  0// Give us a Y=0x59, // Give us an A=0x41, // Give us an FF=0xFF // Give us an S=0x53// And what have we got... #define YAFFS_MAGIC					0x5941FF53#define YAFFS_NTNODES_LEVEL0	  	16#define YAFFS_TNODES_LEVEL0_BITS	4#define YAFFS_TNODES_LEVEL0_MASK	0xf#define YAFFS_NTNODES_INTERNAL 		(YAFFS_NTNODES_LEVEL0 / 2)#define YAFFS_TNODES_INTERNAL_BITS 	(YAFFS_TNODES_LEVEL0_BITS - 1)#define YAFFS_TNODES_INTERNAL_MASK	0x7#define YAFFS_TNODES_MAX_LEVEL		6		#define YAFFS_BYTES_PER_SPARE		16#define YAFFS_BYTES_PER_CHUNK		512//#define YAFFS_CHUNK_SIZE_SHIFT		9#define YAFFS_CHUNKS_PER_BLOCK		32#define YAFFS_BYTES_PER_BLOCK		(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)#define YAFFS_MAX_CHUNK_ID			0x000FFFFF#define YAFFS_UNUSED_OBJECT_ID		0x0003FFFF#define YAFFS_ALLOCATION_NOBJECTS	100#define YAFFS_ALLOCATION_NTNODES	100#define YAFFS_ALLOCATION_NLINKS		100#define YAFFS_NOBJECT_BUCKETS		256#define YAFFS_OBJECT_SPACE			0x40000#define YAFFS_MAX_NAME_LENGTH		255#define YAFFS_SHORT_NAME_LENGTH		15#define YAFFS_MAX_ALIAS_LENGTH		159#define YAFFS_OBJECTID_ROOT			1#define YAFFS_OBJECTID_LOSTNFOUND	2#define YAFFS_OBJECTID_UNLINKED		3#define YAFFS_MAX_SHORT_OP_CACHES	20//force to disable the softdelete#define CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION 1/////////////////////// ChunkCache is used for short read/write operations.typedef struct{	struct yaffs_ObjectStruct *object;	int chunkId;	int lastUse;	int dirty;		int nBytes;	// Only valid if the cache is dirty	__u8 data[YAFFS_BYTES_PER_CHUNK];} yaffs_ChunkCache;// Tags structures in RAM// NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise// the structure size will get blown out.typedef struct{    unsigned chunkId:20;    unsigned serialNumber:2;    unsigned byteCount:10;    unsigned objectId:18;    unsigned ecc:12;    unsigned unusedStuff:2;} yaffs_Tags;typedef union{    yaffs_Tags asTags;    __u8       asBytes[8];} yaffs_TagsUnion;// Spare structuretypedef struct{    __u8  tagByte0;    __u8  tagByte1;    __u8  tagByte2;    __u8  tagByte3;    __u8  pageStatus; 	// set to 0 to delete the chunk    __u8  blockStatus;    __u8  tagByte4;    __u8  tagByte5;    __u8  ecc1[3];    __u8  tagByte6;    __u8  tagByte7;    __u8  ecc2[3];} yaffs_Spare;//Special structure for passing through to mtdstruct yaffs_NANDSpare {	yaffs_Spare	spare;	int		eccres1;	int		eccres2;};// Block data in RAMtypedef enum {	YAFFS_BLOCK_STATE_UNKNOWN	= 0,	YAFFS_BLOCK_STATE_SCANNING,		// Used while the block is being scanned.									// NB Don't erase blocks while they're being scanned		YAFFS_BLOCK_STATE_EMPTY,		// This block is empty		YAFFS_BLOCK_STATE_ALLOCATING,	// This block is partially allocated. 									// This is the one currently being used for page									// allocation. Should never be more than one of these								YAFFS_BLOCK_STATE_FULL,			// All the pages in this block have been allocated.									// At least one page holds valid data.							 	YAFFS_BLOCK_STATE_DIRTY,		// All pages have been allocated and deleted. 									// Erase me, reuse me.								YAFFS_BLOCK_STATE_DEAD 			// This block has failed and is not in use} yaffs_BlockState;typedef struct{#ifndef CONFIG_YAFFS_NO_YAFFS2	__u32 sequenceNumber;	// block sequence number for yaffs2#endif	int   softDeletions:8;  // number of soft deleted pages    int   pagesInUse:8;		// number of pages in use    __u32 blockState:4; 	// One of the above block states    __u32 needsRetiring:1;	// Data has failed on this block, need to get valid data off    						// and retire the block.} yaffs_BlockInfo;//////////////////// Object structure ///////////////////////////// This is the object structure as stored on NANDtypedef enum{	YAFFS_OBJECT_TYPE_UNKNOWN,	YAFFS_OBJECT_TYPE_FILE,	YAFFS_OBJECT_TYPE_SYMLINK,	YAFFS_OBJECT_TYPE_DIRECTORY,	YAFFS_OBJECT_TYPE_HARDLINK,	YAFFS_OBJECT_TYPE_SPECIAL} yaffs_ObjectType;typedef struct{	yaffs_ObjectType type;	// Apply to everything		int   parentObjectId;	__u16 sum__NoLongerUsed;	// checksum of name. Calc this off the name to prevent inconsistencies	char  name[YAFFS_MAX_NAME_LENGTH + 1];	// Thes following apply to directories, files, symlinks - not hard links	__u32 st_mode;  // protection#ifdef CONFIG_YAFFS_WINCE	__u32 notForWinCE[5];#else	__u32 st_uid;   // user ID of owner	__u32 st_gid;    // group ID of owner 	__u32 st_atime; // time of last access	__u32 st_mtime; // time of last modification	__u32 st_ctime; // time of last change#endif	// File size  applies to files only	int fileSize; 			// Equivalent object id applies to hard links only.	int  equivalentObjectId;		// Alias is for symlinks only.	char alias[YAFFS_MAX_ALIAS_LENGTH + 1];		__u32 st_rdev;  // device stuff for block and char devices (maj/min)	#ifdef CONFIG_YAFFS_WINCE	__u32 win_ctime[2];	__u32 win_atime[2];	__u32 win_mtime[2];	__u32 roomToGrow[6];#else	__u32 roomToGrow[12];#endif	} yaffs_ObjectHeader;////////////////////  Tnode ///////////////////////////union yaffs_Tnode_union{#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL+1];#else	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];#endif	__u16 level0[YAFFS_NTNODES_LEVEL0];	};typedef union yaffs_Tnode_union yaffs_Tnode;struct yaffs_TnodeList_struct{	struct yaffs_TnodeList_struct *next;	yaffs_Tnode *tnodes;};typedef struct yaffs_TnodeList_struct yaffs_TnodeList;///////////////////  Object ////////////////////////////////// An object can be one of:// - a directory (no data, has children links// - a regular file (data.... not prunes :->).// - a symlink [symbolic link] (the alias).// - a hard linktypedef struct {	__u32 fileSize;	__u32 scannedFileSize;	int   topLevel;	yaffs_Tnode *top;} yaffs_FileStructure;typedef struct{	struct list_head children; // list of child links} yaffs_DirectoryStructure;typedef struct{	char *alias;} yaffs_SymLinkStructure;typedef struct{	struct yaffs_ObjectStruct *equivalentObject;	__u32	equivalentObjectId;} yaffs_HardLinkStructure;typedef union{	yaffs_FileStructure fileVariant;	yaffs_DirectoryStructure directoryVariant;	yaffs_SymLinkStructure symLinkVariant;	yaffs_HardLinkStructure hardLinkVariant;} yaffs_ObjectVariant;