typedef union{	yaffs_FileStructure fileVariant;	yaffs_DirectoryStructure directoryVariant;	yaffs_SymLinkStructure symLinkVariant;	yaffs_HardLinkStructure hardLinkVariant;} yaffs_ObjectVariant;struct  yaffs_ObjectStruct{	__u8 deleted: 1;		// This should only apply to unlinked files.	__u8 softDeleted: 1;	// it has also been soft deleted	__u8 unlinked: 1;		// An unlinked file. The file should be in the unlinked pseudo directory.	__u8 fake:1;			// A fake object has no presence on NAND.	__u8 renameAllowed:1;	__u8 unlinkAllowed:1;	__u8 dirty:1;			// the object needs to be written to flash	__u8 valid:1;			// When the file system is being loaded up, this 							// object might be created before the data							// is available (ie. file data records appear before the header).	__u8 serial;			// serial number of chunk in NAND. Store here so we don't have to							// read back the old one to update.	__u16 sum;				// sum of the name to speed searching		struct yaffs_DeviceStruct *myDev; // The device I'm on										struct list_head hashLink;	// list of objects in this hash bucket								struct list_head hardLinks; // all the equivalent hard linked objects								// live on this list	// directory structure stuff	struct yaffs_ObjectStruct  *parent;	//my parent directory	struct list_head siblings;	// siblings in a directory								// also used for linking up the free list			// Where's my data in NAND?	long chunkId;		// where it lives	long nDataChunks;			__u32 objectId;		// the object id value			__u32 st_mode;  	// protection#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM	char shortName[YAFFS_SHORT_NAME_LENGTH+1];#endif#ifndef __KERNEL__	__u32 inUse;#endif#ifdef CONFIG_YAFFS_WINCE	__u32 win_ctime[2];	__u32 win_mtime[2];	__u32 win_atime[2];#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	__u32 st_rdev; 	    // device stuff for block and char devices#ifdef __KERNEL__	struct inode *myInode;#endif		yaffs_ObjectType variantType;		yaffs_ObjectVariant variant;	};typedef struct yaffs_ObjectStruct yaffs_Object;struct yaffs_ObjectList_struct{	yaffs_Object *objects;	struct yaffs_ObjectList_struct *next;};typedef struct yaffs_ObjectList_struct yaffs_ObjectList;typedef struct{	struct list_head list;	long count;} yaffs_ObjectBucket;//////////////////// Device ////////////////////////////////struct yaffs_DeviceStruct{	// Entry parameters set up way early. Yaffs sets up the rest.	long  nBytesPerChunk; 	 // Should be a power of 2 >= 512	long  nChunksPerBlock;	 // does not need to be a power of 2	long  startBlock;		 // Start block we're allowed to use	long  endBlock;			 // End block we're allowed to use	long  nReservedBlocks;	 // We want this tuneable so that we can reduce							 // reserved blocks on NOR and RAM.		int   useNANDECC;		// Flag to decide whether or not to use NANDECC	int   nShortOpCaches;	// If <= 0, then short op caching is disabled, else							// the number of short op caches (don't use too many).			void *genericDevice; // Pointer to device context						 // On an mtd this holds the mtd pointer.	// NAND access functions (Must be set before calling YAFFS)		int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev, long chunkInNAND, const __u8 *data, yaffs_Spare *spare);	int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev, long chunkInNAND, __u8 *data, yaffs_Spare *spare);	int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev, long blockInNAND);		int (*initialiseNAND)(struct yaffs_DeviceStruct *dev);	// Runtime parameters. Set up by YAFFS.		__u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16	__u16 chunkGroupSize; // == 2^^chunkGroupBits	#ifdef __KERNEL__	struct semaphore sem;// Semaphore for waiting on erasure.	struct semaphore grossLock; // Gross locking semaphore#endif	#ifdef __KERNEL__	void (*putSuperFunc)(struct super_block *sb);#endif	int isMounted;		// Block Info	yaffs_BlockInfo *blockInfo;	__u8 *chunkBits;   // bitmap of chunks in use	long  chunkBitmapStride; // Number of bytes of chunkBits per block. 							 //	Must be consistent with nChunksPerBlock.	long  nErasedBlocks;	long  allocationBlock;			// Current block being allocated off	__u32 allocationPage;	long  allocationBlockFinder;	// Used to search for next allocation block		// Runtime state	long  nTnodesCreated;		yaffs_Tnode *freeTnodes;	long  nFreeTnodes;	yaffs_TnodeList *allocatedTnodeList;	long  nObjectsCreated;	yaffs_Object *freeObjects;	long  nFreeObjects;	yaffs_ObjectList *allocatedObjectList;	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];	long  nFreeChunks;			long  currentDirtyChecker;	// Used to find current dirtiest block			// Operations since mount	long nPageWrites;	long nPageReads;	long nBlockErasures;	long nGCCopies;	long garbageCollections;	long passiveGarbageCollections;	long nRetriedWrites;	long nRetiredBlocks;	long eccFixed;	long eccUnfixed;	long tagsEccFixed;	long tagsEccUnfixed;	long nDeletions;	long nUnmarkedDeletions;		yaffs_Object *rootDir;	yaffs_Object *lostNFoundDir;		// Buffer areas for storing data to recover from write failures//	__u8 		bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];//	yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];	long bufferedBlock;	// Which block is buffered here?	int doingBufferedBlockRewrite;	yaffs_ChunkCache *srCache;	long srLastUse;	long cacheHits;	// Stuff for background deletion and unlinked files.	yaffs_Object *unlinkedDir;		// Directory where unlinked and deleted files live.	yaffs_Object *unlinkedDeletion;	// Current file being background deleted.	long nDeletedFiles;				// Count of files awaiting deletion;	long nUnlinkedFiles;				// Count of unlinked files. 	long nBackgroundDeletions;		// Count of background deletions.			__u8 *localBuffer;	};typedef struct yaffs_DeviceStruct yaffs_Device;//////////// YAFFS Functions //////////////////int yaffs_GutsInitialise(yaffs_Device *dev);void yaffs_Deinitialise(yaffs_Device *dev);long yaffs_GetNumberOfFreeChunks(yaffs_Device *dev);// Renameint yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName);// generic Object functionsint yaffs_Unlink(yaffs_Object *dir, const char *name);int yaffs_DeleteFile(yaffs_Object *obj);// Object access functions.int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize);long yaffs_GetObjectFileLength(yaffs_Object *obj);long yaffs_GetObjectInode(yaffs_Object *obj);int yaffs_GetObjectType(yaffs_Object *obj);int yaffs_GetObjectLinkCount(yaffs_Object *obj);// Change inode attributesint yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr);int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr);// File operationslong yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, long nBytes);long yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, long nBytes);long yaffs_ResizeFile(yaffs_Object *obj, long newSize);yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid);int yaffs_FlushFile(yaffs_Object *obj,int updateTime);// Directory operationsyaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid);yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const char *name);int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *));yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number);// Link operationsyaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject);yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj);// Symlink operationsyaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const char *name, __u32 mode,  __u32 uid, __u32 gid, const char *alias);char *yaffs_GetSymlinkAlias(yaffs_Object *obj);// Special inodes (fifos, sockets and devices)yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev);// Special directoriesyaffs_Object *yaffs_Root(yaffs_Device *dev);yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);#ifdef CONFIG_YAFFS_WINCE// CONFIG_YAFFS_WINCE special stuffvoid  yfsd_WinFileTimeNow(__u32 target[2]);#endif// Debug dump int yaffs_DumpObject(yaffs_Object *obj);void yaffs_GutsTest(yaffs_Device *dev);#endif