YAFFS2 import

Direct import of yaffs as a tarball as of 20071113 from their public
CVS-web at http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2/

The code can also be imported on the command line with:
export CVSROOT=:pserver:anonymous@cvs.aleph1.co.uk:/home/aleph1/cvs cvs logon
(Hit return when asked for a password)
cvs checkout yaffs2

Signed-off-by: William Juul <william.juul@tandberg.com>
Signed-off-by: Stig Olsen <stig.olsen@tandberg.com>

1 files changed, 441 insertions, 0 deletions

diff --git a/fs/yaffs2/direct/yaffs_fileem2k.c b/fs/yaffs2/direct/yaffs_fileem2k.c
new file mode 100644
index 0000000000..7a3b299996
--- /dev/null
+++ b/fs/yaffs2/direct/yaffs_fileem2k.c
@@ -0,0 +1,441 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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 General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This provides a YAFFS nand emulation on a file for emulating 2kB pages.
+ * This is only intended as test code to test persistence etc.
+ */
+
+const char *yaffs_flashif_c_version = "$Id: yaffs_fileem2k.c,v 1.12 2007/02/14 01:09:06 wookey Exp $";
+
+
+#include "yportenv.h"
+
+#include "yaffs_flashif.h"
+#include "yaffs_guts.h"
+#include "devextras.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h> 
+
+#include "yaffs_fileem2k.h"
+#include "yaffs_packedtags2.h"
+
+//#define SIMULATE_FAILURES
+
+typedef struct 
+{
+	__u8 data[PAGE_SIZE]; // Data + spare
+} yflash_Page;
+
+typedef struct
+{
+	yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
+	
+} yflash_Block;
+
+
+
+#define MAX_HANDLES 20
+#define BLOCKS_PER_HANDLE 8000
+
+typedef struct
+{
+	int handle[MAX_HANDLES];
+	int nBlocks;
+} yflash_Device;
+
+static yflash_Device filedisk;
+
+int yaffs_testPartialWrite = 0;
+
+
+
+
+static __u8 localBuffer[PAGE_SIZE];
+
+static char *NToName(char *buf,int n)
+{
+	sprintf(buf,"emfile%d",n);
+	return buf;
+}
+
+static char dummyBuffer[BLOCK_SIZE];
+
+static int GetBlockFileHandle(int n)
+{
+	int h;
+	int requiredSize;
+	
+	char name[40];
+	NToName(name,n);
+	int fSize;
+	int i;
+	
+	h =  open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
+	if(h >= 0){
+		fSize = lseek(h,0,SEEK_END);
+		requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
+		if(fSize < requiredSize){
+		   for(i = 0; i < BLOCKS_PER_HANDLE; i++)
+		   	if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
+				return -1;
+			
+		}
+	}
+	
+	return h;
+
+}
+
+static int  CheckInit(void)
+{
+	static int initialised = 0;
+	int h;
+	int i;
+
+	
+	off_t fSize;
+	off_t requiredSize;
+	int written;
+	int blk;
+	
+	yflash_Page p;
+	
+	if(initialised) 
+	{
+		return YAFFS_OK;
+	}
+
+	initialised = 1;
+	
+	memset(dummyBuffer,0xff,sizeof(dummyBuffer));
+	
+	
+	filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
+
+	for(i = 0; i <  MAX_HANDLES; i++)
+		filedisk.handle[i] = -1;
+	
+	for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
+		filedisk.handle[i] = GetBlockFileHandle(i);
+	
+	
+	return 1;
+}
+
+
+int yflash_GetNumberOfBlocks(void)
+{
+	CheckInit();
+	
+	return filedisk.nBlocks;
+}
+
+int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
+{
+	int written;
+	int pos;
+	int h;
+	int i;
+	int nRead;
+	int error;
+	
+	T(YAFFS_TRACE_MTD,(TSTR("write chunk %d data %x tags %x" TENDSTR),chunkInNAND,(unsigned)data, (unsigned)tags));
+
+	CheckInit();
+	
+	
+	
+	if(data)
+	{
+		pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+		h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+		
+		lseek(h,pos,SEEK_SET);
+		nRead =  read(h, localBuffer,dev->nDataBytesPerChunk);
+		for(i = error = 0; i < dev->nDataBytesPerChunk && !error; i++){
+			if(localBuffer[i] != 0xFF){
+				printf("nand simulation: chunk %d data byte %d was %0x2\n",
+					chunkInNAND,i,localBuffer[i]);
+				error = 1;
+			}
+		}
+		
+		for(i = 0; i < dev->nDataBytesPerChunk; i++)
+		  localBuffer[i] &= data[i];
+		  
+		if(memcmp(localBuffer,data,dev->nDataBytesPerChunk))
+			printf("nand simulator: data does not match\n");
+			
+		lseek(h,pos,SEEK_SET);
+		written = write(h,localBuffer,dev->nDataBytesPerChunk);
+		
+		if(yaffs_testPartialWrite){
+			close(h);
+			exit(1);
+		}
+		
+#ifdef SIMULATE_FAILURES
+			if((chunkInNAND >> 6) == 100) 
+			  written = 0;
+
+			if((chunkInNAND >> 6) == 110) 
+			  written = 0;
+#endif
+
+
+		if(written != dev->nDataBytesPerChunk) return YAFFS_FAIL;
+	}
+	
+	if(tags)
+	{
+		pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE ;
+		h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+		
+		lseek(h,pos,SEEK_SET);
+
+		if( 0 && dev->isYaffs2)
+		{
+			
+			written = write(h,tags,sizeof(yaffs_ExtendedTags));
+			if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
+		}
+		else
+		{
+			yaffs_PackedTags2 pt;
+			yaffs_PackTags2(&pt,tags);
+			__u8 * ptab = (__u8 *)&pt;
+
+			nRead = read(h,localBuffer,sizeof(pt));
+			for(i = error = 0; i < sizeof(pt) && !error; i++){
+				if(localBuffer[i] != 0xFF){
+					printf("nand simulation: chunk %d oob byte %d was %0x2\n",
+						chunkInNAND,i,localBuffer[i]);
+						error = 1;
+				}
+			}
+		
+			for(i = 0; i < sizeof(pt); i++)
+			  localBuffer[i] &= ptab[i];
+			 
+			if(memcmp(localBuffer,&pt,sizeof(pt)))
+				printf("nand sim: tags corruption\n");
+				
+			lseek(h,pos,SEEK_SET);
+			
+			written = write(h,localBuffer,sizeof(pt));
+			if(written != sizeof(pt)) return YAFFS_FAIL;
+		}
+	}
+	
+
+	return YAFFS_OK;	
+
+}
+
+int yaffs_CheckAllFF(const __u8 *ptr, int n)
+{
+	while(n)
+	{
+		n--;
+		if(*ptr!=0xFF) return 0;
+		ptr++;
+	}
+	return 1;
+}
+
+
+static int fail300 = 1;
+static int fail320 = 1;
+
+static int failRead10 = 2;
+
+int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+	int nread;
+	int pos;
+	int h;
+	
+	T(YAFFS_TRACE_MTD,(TSTR("read chunk %d data %x tags %x" TENDSTR),chunkInNAND,(unsigned)data, (unsigned)tags));
+	
+	CheckInit();
+	
+	
+	
+	if(data)
+	{
+
+		pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+		h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];		
+		lseek(h,pos,SEEK_SET);
+		nread = read(h,data,dev->nDataBytesPerChunk);
+		
+		
+		if(nread != dev->nDataBytesPerChunk) return YAFFS_FAIL;
+	}
+	
+	if(tags)
+	{
+		pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
+		h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];		
+		lseek(h,pos,SEEK_SET);
+
+		if(0 && dev->isYaffs2)
+		{
+			nread= read(h,tags,sizeof(yaffs_ExtendedTags));
+			if(nread != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
+			if(yaffs_CheckAllFF((__u8 *)tags,sizeof(yaffs_ExtendedTags)))
+			{
+				yaffs_InitialiseTags(tags);
+			}
+			else
+			{
+				tags->chunkUsed = 1;
+			}
+		}
+		else
+		{
+			yaffs_PackedTags2 pt;
+			nread= read(h,&pt,sizeof(pt));
+			yaffs_UnpackTags2(tags,&pt);
+#ifdef SIMULATE_FAILURES
+			if((chunkInNAND >> 6) == 100) {
+			    if(fail300 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
+			       tags->eccResult = YAFFS_ECC_RESULT_FIXED;
+			       fail300 = 0;
+			    }
+			    
+			}
+			if((chunkInNAND >> 6) == 110) {
+			    if(fail320 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
+			       tags->eccResult = YAFFS_ECC_RESULT_FIXED;
+			       fail320 = 0;
+			    }
+			}
+#endif
+			if(failRead10>0 && chunkInNAND == 10){
+				failRead10--;
+				nread = 0;
+			}
+			
+			if(nread != sizeof(pt)) return YAFFS_FAIL;
+		}
+	}
+	
+
+	return YAFFS_OK;	
+
+}
+
+
+int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+	int written;
+	int h;
+	
+	yaffs_PackedTags2 pt;
+
+	CheckInit();
+	
+	memset(&pt,0,sizeof(pt));
+	h = filedisk.handle[(blockNo / ( BLOCKS_PER_HANDLE))];
+	lseek(h,((blockNo % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
+	written = write(h,&pt,sizeof(pt));
+		
+	if(written != sizeof(pt)) return YAFFS_FAIL;
+	
+	
+	return YAFFS_OK;
+	
+}
+
+int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
+{
+
+	int i;
+	int h;
+		
+	CheckInit();
+	
+	printf("erase block %d\n",blockNumber);
+	
+	if(blockNumber == 320)
+		fail320 = 1;
+	
+	if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
+	{
+		T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
+		return YAFFS_FAIL;
+	}
+	else
+	{
+	
+		__u8 pg[PAGE_SIZE];
+		int syz = PAGE_SIZE;
+		int pos;
+		
+		memset(pg,0xff,syz);
+		
+
+		h = filedisk.handle[(blockNumber / ( BLOCKS_PER_HANDLE))];
+		lseek(h,((blockNumber % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE,SEEK_SET);		
+		for(i = 0; i < dev->nChunksPerBlock; i++)
+		{
+			write(h,pg,PAGE_SIZE);
+		}
+		pos = lseek(h, 0,SEEK_CUR);
+		
+		return YAFFS_OK;
+	}
+	
+}
+
+int yflash_InitialiseNAND(yaffs_Device *dev)
+{
+	CheckInit();
+	
+	return YAFFS_OK;
+}
+
+
+
+
+int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
+{
+	yaffs_ExtendedTags tags;
+	int chunkNo;
+
+	*sequenceNumber = 0;
+	
+	chunkNo = blockNo * dev->nChunksPerBlock;
+	
+	yflash_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
+	if(tags.blockBad)
+	{
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	}
+	else if(!tags.chunkUsed)
+	{
+		*state = YAFFS_BLOCK_STATE_EMPTY;
+	}
+	else if(tags.chunkUsed)
+	{
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+		*sequenceNumber = tags.sequenceNumber;
+	}
+	return YAFFS_OK;
+}
+