--- /dev/null
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 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_flashif2_c_version = "$Id: yaffs_fileem2k.c,v 1.24 2010-02-18 01:18:04 charles Exp $";
+
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_flashif2.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 REPORT_ERROR 0
+
+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 (32*8)
+
+typedef struct
+{
+ int handle[MAX_HANDLES];
+ int nBlocks;
+} yflash_Device;
+
+static yflash_Device filedisk;
+
+int yaffs_testPartialWrite = 0;
+
+extern int random_seed;
+extern int simulate_power_failure;
+static int initialised = 0;
+static int remaining_ops;
+static int nops_so_far;
+
+int ops_multiplier;
+
+
+static void yflash2_MaybePowerFail(unsigned int chunkInNAND, int failPoint)
+{
+
+ nops_so_far++;
+
+
+ remaining_ops--;
+ if(simulate_power_failure &&
+ remaining_ops < 1){
+ printf("Simulated power failure after %d operations\n",nops_so_far);
+ printf(" power failed on chunkInNAND %d, at fail point %d\n",
+ chunkInNAND, failPoint);
+ exit(0);
+ }
+}
+
+
+
+
+
+static __u8 localBuffer[PAGE_SIZE];
+
+static char *NToName(char *buf,int n)
+{
+ sprintf(buf,"emfile-2k-%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 i;
+
+ int blk;
+
+
+ if(initialised)
+ {
+ return YAFFS_OK;
+ }
+
+ initialised = 1;
+
+
+ srand(random_seed);
+ remaining_ops = (rand() % 1000) * 5;
+ 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 yflash2_GetNumberOfBlocks(void)
+{
+ CheckInit();
+
+ return filedisk.nBlocks;
+}
+
+int yflash2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const 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(dev->param.inbandTags){
+
+ yaffs_PackedTags2TagsPart * pt2tp;
+ pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
+ yaffs_PackTags2TagsPart(pt2tp,tags);
+
+ 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);
+ written = write(h,data,dev->param.totalBytesPerChunk);
+
+
+ if(yaffs_testPartialWrite){
+ close(h);
+ exit(1);
+ }
+
+ if(written != dev->param.totalBytesPerChunk) return YAFFS_FAIL;
+
+
+ }
+
+ else {
+ /* First do a write of a partial page */
+ int n_partials;
+ int bpos;
+
+ if(data)
+ {
+ pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+ h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+
+
+ memcpy(localBuffer,data, dev->nDataBytesPerChunk);
+
+ n_partials = rand()%20;
+
+ for(i = 0; i < n_partials; i++){
+ bpos = rand() % dev->nDataBytesPerChunk;
+
+ localBuffer[bpos] |= (1 << (rand() & 7));
+ }
+
+ if(REPORT_ERROR && 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);
+ }
+
+
+ if(written != dev->nDataBytesPerChunk) return YAFFS_FAIL;
+ }
+ // yflash2_MaybePowerFail(chunkInNAND,1);
+
+ 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->param.isYaffs2)
+ {
+
+ written = write(h,tags,sizeof(yaffs_ExtendedTags));
+ if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
+ }
+ else
+ {
+ yaffs_PackedTags2 pt;
+ yaffs_PackTags2(&pt,tags, !dev->param.noTagsECC);
+ __u8 * ptab = (__u8 *)&pt;
+
+ nRead = read(h,localBuffer,sizeof(pt));
+ for(i = error = 0; REPORT_ERROR && 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];
+
+ n_partials = rand()% sizeof(pt);
+
+ for(i = 0; i < n_partials; i++){
+ bpos = rand() % sizeof(pt);
+
+ localBuffer[bpos] |= (1 << (rand() & 7));
+ }
+
+ if(REPORT_ERROR && 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;
+ }
+ }
+
+ //yflash2_MaybePowerFail(chunkInNAND,2);
+
+ /* Next do the whole write */
+ if(data)
+ {
+ pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+ h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+
+
+ memset(localBuffer,0xFF, PAGE_SIZE);
+ for(i = 0; i < dev->nDataBytesPerChunk; i++){
+ localBuffer[i] &= data[i];
+ }
+
+ if(REPORT_ERROR && 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);
+ }
+
+
+ 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->param.isYaffs2)
+ {
+
+ written = write(h,tags,sizeof(yaffs_ExtendedTags));
+ if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
+ }
+ else
+ {
+ yaffs_PackedTags2 pt;
+ yaffs_PackTags2(&pt,tags,!dev->param.noTagsECC);
+ __u8 * ptab = (__u8 *)&pt;
+
+ nRead = read(h,localBuffer,sizeof(pt));
+ for(i = error = 0; REPORT_ERROR && 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(REPORT_ERROR && 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;
+ }
+ }
+
+ yflash2_MaybePowerFail(chunkInNAND,3);
+
+ }
+ 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 yflash2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
+{
+ int nread;
+ int pos;
+ int h;
+ int localData = 0;
+ int retval = YAFFS_OK;
+ int nRead;
+
+ T(YAFFS_TRACE_MTD,(TSTR("read chunk %d data %x tags %x" TENDSTR),chunkInNAND,(unsigned)data, (unsigned)tags));
+
+ CheckInit();
+
+
+
+
+ if(dev->param.inbandTags){
+ /* Got to suck the tags out of the data area */
+ if(!data) {
+ localData=1;
+ data = yaffs_GetTempBuffer(dev,__LINE__);
+ }
+
+
+ yaffs_PackedTags2TagsPart * pt2tp;
+ pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
+
+
+ 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->param.totalBytesPerChunk);
+
+ yaffs_UnpackTags2TagsPart(tags,pt2tp);
+
+ if(nread != dev->param.totalBytesPerChunk)
+ retval = YAFFS_FAIL;
+
+ if(localData)
+ yaffs_ReleaseTempBuffer(dev,data,__LINE__);
+
+
+
+ }
+
+ else {
+
+ 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)
+ retval = 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->param.isYaffs2)
+ {
+ nread= read(h,tags,sizeof(yaffs_ExtendedTags));
+ if(nread != sizeof(yaffs_ExtendedTags))
+ retval = 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, !dev->param.noTagsECC);
+#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))
+ retval = YAFFS_FAIL;
+ }
+ }
+ }
+
+
+
+ return retval;
+
+}
+
+
+int yflash2_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->param.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 yflash2_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->param.nChunksPerBlock) * PAGE_SIZE,SEEK_SET);
+ for(i = 0; i < dev->param.nChunksPerBlock; i++)
+ {
+ write(h,pg,PAGE_SIZE);
+ }
+ pos = lseek(h, 0,SEEK_CUR);
+
+ return YAFFS_OK;
+ }
+
+}
+
+int yflash2_InitialiseNAND(yaffs_Device *dev)
+{
+ CheckInit();
+
+ return YAFFS_OK;
+}
+
+
+
+
+int yflash2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, __u32 *sequenceNumber)
+{
+ yaffs_ExtendedTags tags;
+ int chunkNo;
+
+ *sequenceNumber = 0;
+
+ chunkNo = blockNo * dev->param.nChunksPerBlock;
+
+ yflash2_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;
+}
+
projects / yaffs2.git / blobdiff