yaffs_guts.h

YAFFS的升级版本YAFFS2

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;


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?
	int chunkId;		// where it lives

	int nDataChunks;	
	
	__u32 objectId;		// the object id value
	
	
	__u32 st_mode;  	// protection

#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
	YCHAR 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;
	int count;
} yaffs_ObjectBucket;

///////////////////// Temporary buffers ////////////////////
//
// These are chunk-sized working buffers. Each device has a few

typedef struct {
	__u8 *buffer;
	int line; // track from whence this buffer was allocated
	int maxLine;
} yaffs_TempBuffer;

//////////////////// Device ////////////////////////////////

struct yaffs_DeviceStruct
{
	// Entry parameters set up way early. Yaffs sets up the rest.
	int   nBytesPerChunk; 	 // Should be a power of 2 >= 512
	int	  nChunksPerBlock;	 // does not need to be a power of 2
	int   nBytesPerSpare;	 // spare area size
	int   startBlock;		 // Start block we're allowed to use
	int   endBlock;			 // End block we're allowed to use
	int   nReservedBlocks;	 // We want this tuneable so that we can reduce
							 // reserved blocks on NOR and RAM.
	
	int   nShortOpCaches;	// If <= 0, then short op caching is disabled, else
							// the number of short op caches (don't use too many).
							
	int useHeaderFileSize; // Flag to determine if we should use file sizes from the header 

	int   useNANDECC;		// Flag to decide whether or not to use NANDECC
	
	
	void *genericDevice; // Pointer to device context
						 // On an mtd this holds the mtd pointer.

	// NAND access functions (Must be set before calling YAFFS)
	
#ifndef CONFIG_YAFFS_NO_YAFFS1
	int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, const yaffs_Spare *spare);
	int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
//	int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND);	
//	int (*initialiseNAND)(struct yaffs_DeviceStruct *dev);
#endif
#ifndef CONFIG_YAFFS_NO_YAFFS2
	int (*writeChunkWithTagsToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
	int (*readChunkWithTagsFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
	int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND);	
	int (*initialiseNAND)(struct yaffs_DeviceStruct *dev);
	int (*markNANDBlockBad)(struct yaffs_DeviceStruct *dev, int blockNo);
	int (*queryNANDBlock)(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
#endif

	int isYaffs2;

	// End of stuff that must be set before initialisation.
	
	// 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
	int   chunkBitmapStride; // Number of bytes of chunkBits per block. 
							 //	Must be consistent with nChunksPerBlock.


	int   nErasedBlocks;
	int   allocationBlock;			// Current block being allocated off
	__u32 allocationPage;
	int   allocationBlockFinder;	// Used to search for next allocation block
	
	// Runtime state
	int   nTnodesCreated;	
	yaffs_Tnode *freeTnodes;
	int  nFreeTnodes;
	yaffs_TnodeList *allocatedTnodeList;


	int   nObjectsCreated;
	yaffs_Object *freeObjects;
	int   nFreeObjects;

	yaffs_ObjectList *allocatedObjectList;

	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];

	int	  nFreeChunks;
		
	int   currentDirtyChecker;	// Used to find current dirtiest block
	
	__u32  *gcCleanupList; // objects to delete at the end of a GC.	
	
	// Operations since mount
	int nPageWrites;
	int nPageReads;
	int nBlockErasures;
	int nErasureFailures;
	int nGCCopies;
	int garbageCollections;
	int passiveGarbageCollections;
	int nRetriedWrites;
	int nRetiredBlocks;
	int eccFixed;
	int eccUnfixed;
	int tagsEccFixed;
	int tagsEccUnfixed;
	int nDeletions;
	int 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];
	int bufferedBlock;	// Which block is buffered here?
	int doingBufferedBlockRewrite;

	yaffs_ChunkCache *srCache;
	int srLastUse;

	int cacheHits;

	// Stuff for background deletion and unlinked files.
	yaffs_Object *unlinkedDir;		// Directory where unlinked and deleted files live.
	yaffs_Object *deletedDir;		// Directory where deleted objects are sent to disappear.
	yaffs_Object *unlinkedDeletion;	// Current file being background deleted.
	int nDeletedFiles;				// Count of files awaiting deletion;
	int nUnlinkedFiles;				// Count of unlinked files. 
	int nBackgroundDeletions;			// Count of background deletions.	
	
	//__u8 *localBuffer;
	
	yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
	int maxTemp;
	int unmanagedTempAllocations;
	int unmanagedTempDeallocations;
	
	// yaffs2 runtime stuff
	unsigned sequenceNumber;		//Sequence number of currently allocating block
	unsigned oldestDirtySequence;
	
};

typedef struct yaffs_DeviceStruct yaffs_Device;


// Function to manipulate block info
static  Y_INLINE yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
{
	if(blk < dev->startBlock || blk > dev->endBlock)
	{
		T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
		YBUG();
	}
	return &dev->blockInfo[blk - dev->startBlock];
}


//////////// YAFFS Functions //////////////////

int yaffs_GutsInitialise(yaffs_Device *dev);
void yaffs_Deinitialise(yaffs_Device *dev);

int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev);


// Rename
int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName);

// generic Object functions
int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name);
int yaffs_DeleteFile(yaffs_Object *obj);

// Object access functions.
int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize);
int yaffs_GetObjectFileLength(yaffs_Object *obj);
int yaffs_GetObjectInode(yaffs_Object *obj);
unsigned yaffs_GetObjectType(yaffs_Object *obj);
int yaffs_GetObjectLinkCount(yaffs_Object *obj);

// Change inode attributes
int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr);
int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr);

// File operations
int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes);
int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes);
int yaffs_ResizeFile(yaffs_Object *obj, int newSize);

yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid);
int yaffs_FlushFile(yaffs_Object *obj,int updateTime);


// Directory operations
yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid);
yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const YCHAR *name);
int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *));

yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number);

// Link operations
yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject);

yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj);

// Symlink operations
yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name, __u32 mode,  __u32 uid, __u32 gid, const YCHAR *alias);
YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj);

// Special inodes (fifos, sockets and devices)
yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev);


// Special directories
yaffs_Object *yaffs_Root(yaffs_Device *dev);
yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);

#ifdef CONFIG_YAFFS_WINCE
// CONFIG_YAFFS_WINCE special stuff
void  yfsd_WinFileTimeNow(__u32 target[2]);
#endif


// Debug dump 
int yaffs_DumpObject(yaffs_Object *obj);


void yaffs_GutsTest(yaffs_Device *dev);


void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn);
int yaffs_CheckFF(__u8 *buffer,int nBytes);

#endif