}static int yaffs_setattr(struct dentry *dentry, struct iattr *attr){	struct inode *inode = dentry->d_inode;	int error;	yaffs_Device *dev;		T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));		if((error = inode_change_ok(inode,attr)) == 0)	{			dev = yaffs_InodeToObject(inode)->myDev;		yaffs_GrossLock(dev);		if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)		{			error = 0;		}		else		{			error = -EPERM;		}		yaffs_GrossUnlock(dev);		inode_setattr(inode,attr);	}	return error;}static int yaffs_statfs(struct super_block *sb, struct statfs *buf){	yaffs_Device *dev = yaffs_SuperToDevice(sb);	T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));	yaffs_GrossLock(dev);		buf->f_type = YAFFS_MAGIC;	buf->f_bsize = sb->s_blocksize;	buf->f_namelen = 255;	buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/						(sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);	buf->f_files = 0;	buf->f_ffree = 0;	buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/						(sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);	buf->f_bavail =  buf->f_bfree;		yaffs_GrossUnlock(dev);	return 0;}static void yaffs_read_inode (struct inode *inode){	// NB This is called as a side effect of other functions and	// thus gross locking should always be in place already.		yaffs_Object *obj ; 	yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);		T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));	obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);		yaffs_FillInodeFromObject(inode,obj);}static yaffs_Device *yaffs_dev;static yaffs_Device *yaffsram_dev;static void yaffs_put_super(struct super_block *sb){	yaffs_Device *dev = yaffs_SuperToDevice(sb);		yaffs_GrossLock(dev);	if(dev->putSuperFunc)	{		 dev->putSuperFunc(sb);	}	yaffs_Deinitialise(dev);	yaffs_GrossUnlock(dev);	if(dev == yaffs_dev) yaffs_dev = NULL;	if(dev == yaffsram_dev) yaffsram_dev = NULL;			kfree(dev);}#ifdef CONFIG_YAFFS_MTD_ENABLEDstatic void  yaffs_MTDPutSuper(struct super_block *sb){		struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;		if(mtd->sync)	{		mtd->sync(mtd);	}		put_mtd_device(mtd);}#endifstatic struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent){	int nBlocks;	struct inode * inode;	struct dentry * root;	yaffs_Device *dev;		sb->s_magic = YAFFS_MAGIC;	sb->s_op = &yaffs_super_ops;		if(!sb)		printk(KERN_INFO"yaffs: sb is NULL\n");	else if(!sb->s_dev)		printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");	else if(! kdevname(sb->s_dev))		printk(KERN_INFO"yaffs: kdevname is NULL\n");	else		printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));	#ifdef CONFIG_YAFFS_USE_CHUNK_SIZE	sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;	sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;#else	sb->s_blocksize = PAGE_CACHE_SIZE;	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;#endif	T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY	T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));#endif		if(useRam)	{#ifdef CONFIG_YAFFS_RAM_ENABLED		// Set the yaffs_Device up for ram emulation		sb->u.generic_sbp =	dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);		if(!dev)		{			// Deep shit could not allocate device structure			printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");			return NULL;		}		memset(dev,0,sizeof(yaffs_Device));		dev->genericDevice = NULL; // Not used for RAM emulation.		nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);		dev->startBlock = 1;  // Don't use block 0		dev->endBlock = nBlocks - 1;		dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;		dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;		dev->nReservedBlocks = 5;		dev->writeChunkToNAND = nandemul_WriteChunkToNAND;		dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;		dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;		dev->initialiseNAND = nandemul_InitialiseNAND;		yaffsram_dev = dev;		#endif	}	else	{	#ifdef CONFIG_YAFFS_MTD_ENABLED		struct mtd_info *mtd;				printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",		 MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));					// Hope it's a NAND mtd		mtd = get_mtd_device(NULL, MINOR(sb->s_dev));		if (!mtd) 		{			printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));			return NULL;		}				if(mtd->type != MTD_NANDFLASH)		{			printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);			return NULL;		}		//printk(KERN_DEBUG" erase %x\n",mtd->erase);		//printk(KERN_DEBUG" read %x\n",mtd->read);		//printk(KERN_DEBUG" write %x\n",mtd->write);		//printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);		//printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);		//printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);		//printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);		if(!mtd->erase ||		   !mtd->read  ||		   !mtd->write ||#ifndef CONFIG_YAFFS_USE_OLD_MTD		   !mtd->write_ecc ||		   !mtd->read_ecc ||#endif		   !mtd->read_oob ||		   !mtd->write_oob )		{			printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");			return NULL;		}				if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||		   mtd->oobsize != YAFFS_BYTES_PER_SPARE)		{			printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");			return NULL;		}		   		// OK, so if we got here, we have an MTD that's NAND and looks 		// like it has the right capabilities		// Set the yaffs_Device up for ram emulation		sb->u.generic_sbp =	dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);		if(!dev)		{			// Deep shit could not allocate device structure			printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");			return NULL;		}		memset(dev,0,sizeof(yaffs_Device));		dev->genericDevice = mtd; 		// Set up the memory size parameters....				nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);		dev->startBlock = 1;  // Don't use block 0		dev->endBlock = nBlocks - 1;		dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;		dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;		dev->nReservedBlocks = 5;		dev->nShortOpCaches = 10; // Enable short op caching				// ... and the functions.		dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;		dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;		dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;		dev->initialiseNAND = nandmtd_InitialiseNAND;						dev->putSuperFunc = yaffs_MTDPutSuper;		#ifdef CONFIG_YAFFS_USE_NANDECC		dev->useNANDECC = 1;#endif		yaffs_dev = dev;		#endif	}	init_MUTEX(&dev->grossLock);			yaffs_GrossLock(dev);	yaffs_GutsInitialise(yaffs_SuperToDevice(sb));	T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));	// Create root inode	inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));	yaffs_GrossUnlock(dev);	if (!inode)		return NULL;	T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));			root = d_alloc_root(inode);	T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));	if (!root) {		iput(inode);		return NULL;	}	sb->s_root = root;	T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));	return sb;}#ifdef CONFIG_YAFFS_MTD_ENABLEDstatic struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent){	return yaffs_internal_read_super(0,sb,data,silent);}static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);#endif#ifdef CONFIG_YAFFS_RAM_ENABLEDstatic struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent){	return yaffs_internal_read_super(1,sb,data,silent);}static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);#endif // CONFIG_YAFFS_RAM_ENABLEDstatic struct proc_dir_entry *my_proc_entry;static struct proc_dir_entry *my_proc_ram_write_entry;static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name){	buf +=sprintf(buf,"\nDevice %s\n",name);	buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);	buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);	buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);	buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);	buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);	buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);	buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);	buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);	buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);	buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);	buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);	buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);	buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);	buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);	buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);	buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);	buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);	buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);	buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);	buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);	buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);	buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);	buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);	buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);	buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);	buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);	buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);		return buf;	}static int  yaffs_proc_read(        char *page,	char **start,	off_t offset,	int count,	int *eof,	void *data	){	char my_buffer[3000];	char *buf;	buf = my_buffer;	if (offset > 0) return 0;	/* Fill the buffer and get its length */	buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);		if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");	if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");		strcpy(page,my_buffer);	return strlen(my_buffer);}static int  yaffs_proc_ram_write(        char *page,	char **start,	off_t offset,	int count,	int *eof,	void *data	){	printk(KERN_DEBUG "yaffs write size %d\n",count);	return count;}static int __init init_yaffs_fs(void){	int error = 0;		yaffs_dev = yaffsram_dev = NULL;		printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");#ifdef CONFIG_YAFFS_USE_GENERIC_RW	printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");#else	printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");#endif    /* Install the proc_fs entry */    my_proc_entry = create_proc_read_entry("yaffs",                                           S_IRUGO | S_IFREG,					   &proc_root,					   yaffs_proc_read,					   NULL);    if(!my_proc_entry)    {       return -ENOMEM;    }#ifdef CONFIG_YAFFS_RAM_ENABLED#if 0    my_proc_ram_write_entry = create_proc_entry("yaffs_ram",                                           S_IRUGO | S_IFREG,					   &proc_root);     if(!my_proc_ram_write_entry)    {       return -ENOMEM;    }    else    {    	my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;    }#endif    error = register_filesystem(&yaffs_ram_fs_type);    if(error)    {    	return error;    }#endif //CONFIG_YAFFS_RAM_ENABLED#ifdef CONFIG_YAFFS_MTD_ENABLED	error = register_filesystem(&yaffs_fs_type);	if(error)	{#ifdef CONFIG_YAFFS_RAM_ENABLED		unregister_filesystem(&yaffs_ram_fs_type);#endif //CONFIG_YAFFS_RAM_ENABLED	}#endif // CONFIG_YAFFS_MTD_ENABLED	return error;}static void __exit exit_yaffs_fs(void){	printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");    remove_proc_entry("yaffs",&proc_root);    #ifdef CONFIG_YAFFS_RAM_ENABLED	unregister_filesystem(&yaffs_ram_fs_type);#endif#ifdef CONFIG_YAFFS_MTD_ENABLED	unregister_filesystem(&yaffs_fs_type);#endif}module_init(init_yaffs_fs)module_exit(exit_yaffs_fs)MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");MODULE_LICENSE("GPL");