/*
 * 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.
 *
 * $Id$
 */

#ifndef __YAFFS_GUTS_H__
#define __YAFFS_GUTS_H__

#include "devextras.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

#ifndef CONFIG_YAFFS_NO_YAFFS1
#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)
#endif

#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 	1024
#define YAFFS_MIN_YAFFS2_SPARE_SIZE	32

#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

#ifdef CONFIG_YAFFS_UNICODE
#define YAFFS_MAX_NAME_LENGTH		127
#define YAFFS_MAX_ALIAS_LENGTH		79
#else
#define YAFFS_MAX_NAME_LENGTH		255
#define YAFFS_MAX_ALIAS_LENGTH		159
#endif

#define YAFFS_SHORT_NAME_LENGTH		15

// Some special object ids
#define YAFFS_OBJECTID_ROOT		1
#define YAFFS_OBJECTID_LOSTNFOUND	2
#define YAFFS_OBJECTID_UNLINKED		3
#define YAFFS_OBJECTID_DELETED		4

#define YAFFS_MAX_SHORT_OP_CACHES	20

#define YAFFS_N_TEMP_BUFFERS		4

// Sequence numbers are used in YAFFS2 to determine block allocation order.
// The range is limited slightly to help distinguish bad numbers from good.
// This also allows us to perhaps in the future use special numbers for
// special purposes.
// EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years, 
// and is a larger number than the lifetime of a 2GB device.

#define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xEFFFFF00

// 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
	int locked;		// Can't push out or flush while locked..
#ifdef CONFIG_YAFFS_YAFFS2
	__u8 *data;
#else
	__u8 data[YAFFS_BYTES_PER_CHUNK];
#endif
} yaffs_ChunkCache;

#ifndef CONFIG_YAFFS_NO_YAFFS1
// 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;

#endif

typedef enum {
	YAFFS_ECC_RESULT_UNKNOWN,
	YAFFS_ECC_RESULT_NO_ERROR,
	YAFFS_ECC_RESULT_FIXED,
	YAFFS_ECC_RESULT_UNFIXED
} yaffs_ECCResult;

typedef 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 {

	unsigned validMarker0;
	unsigned chunkUsed;	//  Status of the chunk: used or unused
	unsigned objectId;	// If 0 then this is not part of an object (unused)
	unsigned chunkId;	// If 0 then this is a header, else a data chunk
	unsigned byteCount;	// Only valid for data chunks

	// The following stuff only has meaning when we read
	yaffs_ECCResult eccResult;	// Only valid when we read.
	unsigned blockBad;	// Only valid on reading

	// YAFFS 1 stuff        
	unsigned chunkDeleted;	// The chunk is marked deleted
	unsigned serialNumber;	// Yaffs1 2-bit serial number

	// YAFFS2 stuff
	unsigned sequenceNumber;	// The sequence number of this block

	// Extra info if this is an object header (YAFFS2 only)

	unsigned extraHeaderInfoAvailable;	// There is extra info available if this is not zero
	unsigned extraParentObjectId;	// The parent object
	unsigned extraIsShrinkHeader;	// Is it a shrink header?
	unsigned extraShadows;	// Does this shadow another object?

	yaffs_ObjectType extraObjectType;	// What object type?

	unsigned extraFileLength;	// Length if it is a file
	unsigned extraEquivalentObjectId;	// Equivalent object Id if it is a hard link

	unsigned validMarker1;

} yaffs_ExtendedTags;

// Spare structure
typedef 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 mtd
struct yaffs_NANDSpare {
	yaffs_Spare spare;
	int eccres1;
	int eccres2;
};

// Block data in RAM

typedef enum {
	YAFFS_BLOCK_STATE_UNKNOWN = 0,

	YAFFS_BLOCK_STATE_SCANNING,
	YAFFS_BLOCK_STATE_NEEDS_SCANNING,
	// The block might have something on it (ie it is allocating or full, perhaps empty)
	// but it needs to be scanned to determine its true state.
	// This state is only valid during yaffs_Scan.
	// NB We tolerate empty because the pre-scanner might be incapable of deciding
	// However, if this state is returned on a YAFFS2 device, then we expect a sequence number

	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_COLLECTING,	
	// This block is being garbage collected

	YAFFS_BLOCK_STATE_DEAD	
	// This block has failed and is not in use
} yaffs_BlockState;

typedef struct {

	int softDeletions:12;	// number of soft deleted pages
	int pagesInUse:12;	// number of pages in use
	yaffs_BlockState 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.
#ifdef CONFIG_YAFFS_YAFFS2
	__u32 hasShrinkHeader:1;	// This block has at least one object header that does a shrink
	__u32 sequenceNumber;	// block sequence number for yaffs2
#endif

} yaffs_BlockInfo;

//////////////////// Object structure ///////////////////////////
// This is the object structure as stored on NAND

typedef struct {
	yaffs_ObjectType type;

	// Apply to everything  
	int parentObjectId;
	__u16 sum__NoLongerUsed;	// checksum of name. Calc this off the name to prevent inconsistencies
	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];

	// Thes following apply to directories, files, symlinks - not hard links
	__u32 yst_mode;		// protection

#ifdef CONFIG_YAFFS_WINCE
	__u32 notForWinCE[5];
#else
	__u32 yst_uid;		// user ID of owner
	__u32 yst_gid;		// group ID of owner 
	__u32 yst_atime;	// time of last access
	__u32 yst_mtime;	// time of last modification
	__u32 yst_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.
	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];

	__u32 yst_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[4];
#else
	__u32 roomToGrow[10];
#endif

	int shadowsObject;	// This object header shadows the specified object if not > 0

	// isShrink applies to object headers written when we shrink the file (ie resize)
	__u32 isShrink;

} 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 link

typedef struct {
	__u32 fileSize;
	__u32 scannedFileSize;
	__u32 shrinkSize;
	int topLevel;
	yaffs_Tnode *top;
} yaffs_FileStructure;

typedef struct {
	struct list_head children;	// list of child links
} yaffs_DirectoryStructure;

typedef struct {
	YCHAR *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;

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;	// Some objects are not allowed to be renamed.
	__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

	__u8 deferedFree:1;	// For Linux kernel. Object is removed from NAND, but still in the inode cache.
	// Free of object is defered.

	__u8 lazyLoaded;	// Vital info has been loaded from tags. Not all info available.
	// 

	// 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 object header in NAND?
	int chunkId;		// where it lives

	int nDataChunks;	// Number of data chunks attached to the file.  

	__u32 objectId;		// the object id value

	__u32 yst_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 yst_uid;		// user ID of owner
	__u32 yst_gid;		// group ID of owner 
	__u32 yst_atime;	// time of last access
	__u32 yst_mtime;	// time of last modification
	__u32 yst_ctime;	// time of last change
#endif

	__u32 yst_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 {
	struct list_head devList;
	const char *name;

	// 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)

	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);

#ifdef CONFIG_YAFFS_YAFFS2
	int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
					 int chunkInNAND, const __u8 * data,
					 const yaffs_ExtendedTags * tags);
	int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
					  int chunkInNAND, __u8 * data,
					  yaffs_ExtendedTags * tags);
	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
	__u8 *spareBuffer;	// For mtdif2 use. Don't know the size of the buffer at compile time so we have to allocate it.
	void (*putSuperFunc) (struct super_block * sb);
#endif

	int isMounted;

	// Stuff to support block offsetting to support start block zero
	int internalStartBlock;
	int internalEndBlock;
	int blockOffset;
	int chunkOffset;

	// 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 isDoingGC;

	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 TODO
	//      __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->internalStartBlock || blk > dev->internalEndBlock) {
		T(YAFFS_TRACE_ERROR,
		  (TSTR
		   ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
		   blk));
		YBUG();
	}
	return &dev->blockInfo[blk - dev->internalStartBlock];
}

//////////// 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 writeThrough);
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

#ifdef __KERNEL__

void yaffs_HandleDeferedFree(yaffs_Object * obj);
#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