mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-24 19:41:53 +02:00
c5552ad039
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21952 3c298f89-4303-0410-b956-a3cf2f4a3e73
405 lines
10 KiB
C
405 lines
10 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
const char *yaffs_checkptrw_c_version =
|
|
"$Id: yaffs_checkptrw.c,v 1.14 2007-05-15 20:07:40 charles Exp $";
|
|
|
|
|
|
#include "yaffs_checkptrw.h"
|
|
|
|
|
|
static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
|
|
{
|
|
|
|
int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,
|
|
(TSTR("checkpt blocks available = %d" TENDSTR),
|
|
blocksAvailable));
|
|
|
|
|
|
return (blocksAvailable <= 0) ? 0 : 1;
|
|
}
|
|
|
|
|
|
static int yaffs_CheckpointErase(yaffs_Device *dev)
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
if(!dev->eraseBlockInNAND)
|
|
return 0;
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
|
|
dev->internalStartBlock,dev->internalEndBlock));
|
|
|
|
for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
|
|
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
|
|
if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
|
|
if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
|
|
bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
|
|
dev->nErasedBlocks++;
|
|
dev->nFreeChunks += dev->nChunksPerBlock;
|
|
}
|
|
else {
|
|
dev->markNANDBlockBad(dev,i);
|
|
bi->blockState = YAFFS_BLOCK_STATE_DEAD;
|
|
}
|
|
}
|
|
}
|
|
|
|
dev->blocksInCheckpoint = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
|
|
{
|
|
int i;
|
|
int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
|
|
T(YAFFS_TRACE_CHECKPOINT,
|
|
(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
|
|
dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
|
|
|
|
if(dev->checkpointNextBlock >= 0 &&
|
|
dev->checkpointNextBlock <= dev->internalEndBlock &&
|
|
blocksAvailable > 0){
|
|
|
|
for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
|
|
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
|
|
if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
|
|
dev->checkpointNextBlock = i + 1;
|
|
dev->checkpointCurrentBlock = i;
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
|
|
|
|
dev->checkpointNextBlock = -1;
|
|
dev->checkpointCurrentBlock = -1;
|
|
}
|
|
|
|
static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
|
|
{
|
|
int i;
|
|
yaffs_ExtendedTags tags;
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
|
|
dev->blocksInCheckpoint, dev->checkpointNextBlock));
|
|
|
|
if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
|
|
for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
|
|
int chunk = i * dev->nChunksPerBlock;
|
|
int realignedChunk = chunk - dev->chunkOffset;
|
|
|
|
dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
|
|
i, tags.objectId,tags.sequenceNumber,tags.eccResult));
|
|
|
|
if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
|
|
/* Right kind of block */
|
|
dev->checkpointNextBlock = tags.objectId;
|
|
dev->checkpointCurrentBlock = i;
|
|
dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
|
|
dev->blocksInCheckpoint++;
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
|
|
return;
|
|
}
|
|
}
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
|
|
|
|
dev->checkpointNextBlock = -1;
|
|
dev->checkpointCurrentBlock = -1;
|
|
}
|
|
|
|
|
|
int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
|
|
{
|
|
|
|
/* Got the functions we need? */
|
|
if (!dev->writeChunkWithTagsToNAND ||
|
|
!dev->readChunkWithTagsFromNAND ||
|
|
!dev->eraseBlockInNAND ||
|
|
!dev->markNANDBlockBad)
|
|
return 0;
|
|
|
|
if(forWriting && !yaffs_CheckpointSpaceOk(dev))
|
|
return 0;
|
|
|
|
if(!dev->checkpointBuffer)
|
|
dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
|
|
if(!dev->checkpointBuffer)
|
|
return 0;
|
|
|
|
|
|
dev->checkpointPageSequence = 0;
|
|
|
|
dev->checkpointOpenForWrite = forWriting;
|
|
|
|
dev->checkpointByteCount = 0;
|
|
dev->checkpointSum = 0;
|
|
dev->checkpointXor = 0;
|
|
dev->checkpointCurrentBlock = -1;
|
|
dev->checkpointCurrentChunk = -1;
|
|
dev->checkpointNextBlock = dev->internalStartBlock;
|
|
|
|
/* Erase all the blocks in the checkpoint area */
|
|
if(forWriting){
|
|
memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
|
|
dev->checkpointByteOffset = 0;
|
|
return yaffs_CheckpointErase(dev);
|
|
|
|
|
|
} else {
|
|
int i;
|
|
/* Set to a value that will kick off a read */
|
|
dev->checkpointByteOffset = dev->nDataBytesPerChunk;
|
|
/* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
|
|
* going to be way more than we need */
|
|
dev->blocksInCheckpoint = 0;
|
|
dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
|
|
dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
|
|
for(i = 0; i < dev->checkpointMaxBlocks; i++)
|
|
dev->checkpointBlockList[i] = -1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
|
|
{
|
|
__u32 compositeSum;
|
|
compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
|
|
*sum = compositeSum;
|
|
return 1;
|
|
}
|
|
|
|
static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
|
|
{
|
|
|
|
int chunk;
|
|
int realignedChunk;
|
|
|
|
yaffs_ExtendedTags tags;
|
|
|
|
if(dev->checkpointCurrentBlock < 0){
|
|
yaffs_CheckpointFindNextErasedBlock(dev);
|
|
dev->checkpointCurrentChunk = 0;
|
|
}
|
|
|
|
if(dev->checkpointCurrentBlock < 0)
|
|
return 0;
|
|
|
|
tags.chunkDeleted = 0;
|
|
tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
|
|
tags.chunkId = dev->checkpointPageSequence + 1;
|
|
tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
|
|
tags.byteCount = dev->nDataBytesPerChunk;
|
|
if(dev->checkpointCurrentChunk == 0){
|
|
/* First chunk we write for the block? Set block state to
|
|
checkpoint */
|
|
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
|
|
bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
|
|
dev->blocksInCheckpoint++;
|
|
}
|
|
|
|
chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
|
|
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
|
|
chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
|
|
|
|
realignedChunk = chunk - dev->chunkOffset;
|
|
|
|
dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
|
|
dev->checkpointByteOffset = 0;
|
|
dev->checkpointPageSequence++;
|
|
dev->checkpointCurrentChunk++;
|
|
if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
|
|
dev->checkpointCurrentChunk = 0;
|
|
dev->checkpointCurrentBlock = -1;
|
|
}
|
|
memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
|
|
{
|
|
int i=0;
|
|
int ok = 1;
|
|
|
|
|
|
__u8 * dataBytes = (__u8 *)data;
|
|
|
|
|
|
|
|
if(!dev->checkpointBuffer)
|
|
return 0;
|
|
|
|
if(!dev->checkpointOpenForWrite)
|
|
return -1;
|
|
|
|
while(i < nBytes && ok) {
|
|
|
|
|
|
|
|
dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
|
|
dev->checkpointSum += *dataBytes;
|
|
dev->checkpointXor ^= *dataBytes;
|
|
|
|
dev->checkpointByteOffset++;
|
|
i++;
|
|
dataBytes++;
|
|
dev->checkpointByteCount++;
|
|
|
|
|
|
if(dev->checkpointByteOffset < 0 ||
|
|
dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
|
|
ok = yaffs_CheckpointFlushBuffer(dev);
|
|
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
|
|
{
|
|
int i=0;
|
|
int ok = 1;
|
|
yaffs_ExtendedTags tags;
|
|
|
|
|
|
int chunk;
|
|
int realignedChunk;
|
|
|
|
__u8 *dataBytes = (__u8 *)data;
|
|
|
|
if(!dev->checkpointBuffer)
|
|
return 0;
|
|
|
|
if(dev->checkpointOpenForWrite)
|
|
return -1;
|
|
|
|
while(i < nBytes && ok) {
|
|
|
|
|
|
if(dev->checkpointByteOffset < 0 ||
|
|
dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
|
|
|
|
if(dev->checkpointCurrentBlock < 0){
|
|
yaffs_CheckpointFindNextCheckpointBlock(dev);
|
|
dev->checkpointCurrentChunk = 0;
|
|
}
|
|
|
|
if(dev->checkpointCurrentBlock < 0)
|
|
ok = 0;
|
|
else {
|
|
|
|
chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
|
|
dev->checkpointCurrentChunk;
|
|
|
|
realignedChunk = chunk - dev->chunkOffset;
|
|
|
|
/* read in the next chunk */
|
|
/* printf("read checkpoint page %d\n",dev->checkpointPage); */
|
|
dev->readChunkWithTagsFromNAND(dev, realignedChunk,
|
|
dev->checkpointBuffer,
|
|
&tags);
|
|
|
|
if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
|
|
tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
|
|
ok = 0;
|
|
|
|
dev->checkpointByteOffset = 0;
|
|
dev->checkpointPageSequence++;
|
|
dev->checkpointCurrentChunk++;
|
|
|
|
if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
|
|
dev->checkpointCurrentBlock = -1;
|
|
}
|
|
}
|
|
|
|
if(ok){
|
|
*dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
|
|
dev->checkpointSum += *dataBytes;
|
|
dev->checkpointXor ^= *dataBytes;
|
|
dev->checkpointByteOffset++;
|
|
i++;
|
|
dataBytes++;
|
|
dev->checkpointByteCount++;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int yaffs_CheckpointClose(yaffs_Device *dev)
|
|
{
|
|
|
|
if(dev->checkpointOpenForWrite){
|
|
if(dev->checkpointByteOffset != 0)
|
|
yaffs_CheckpointFlushBuffer(dev);
|
|
} else {
|
|
int i;
|
|
for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
|
|
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
|
|
if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
|
|
bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
|
|
else {
|
|
// Todo this looks odd...
|
|
}
|
|
}
|
|
YFREE(dev->checkpointBlockList);
|
|
dev->checkpointBlockList = NULL;
|
|
}
|
|
|
|
dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
|
|
dev->nErasedBlocks -= dev->blocksInCheckpoint;
|
|
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
|
|
dev->checkpointByteCount));
|
|
|
|
if(dev->checkpointBuffer){
|
|
/* free the buffer */
|
|
YFREE(dev->checkpointBuffer);
|
|
dev->checkpointBuffer = NULL;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
|
|
}
|
|
|
|
int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
|
|
{
|
|
/* Erase the first checksum block */
|
|
|
|
T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
|
|
|
|
if(!yaffs_CheckpointSpaceOk(dev))
|
|
return 0;
|
|
|
|
return yaffs_CheckpointErase(dev);
|
|
}
|
|
|
|
|
|
|