RE: [Yaffs] Optimizing the number of reads and writes to fla…

>static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct 
>*dev, const __u8 *data, yaffs_Spare *spare,int useReserve)
>{
>    int chunk;

>    int writeOk = 1;
>    int attempts = 0;

>    do{
>        chunk = yaffs_AllocateChunk(dev,useReserve);

>        if(chunk >= 0)
>        {

>            // First check this chunk is erased...
>#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
>            writeOk = yaffs_CheckChunkErased(dev,chunk);
>#endif
>            if(!writeOk)
>            {
>                T(YAFFS_TRACE_ERROR,(TSTR("**>> 
>yaffs chunk %d was not erased" TENDSTR),chunk));
>            }
>            else
>            {
>                writeOk =  
>yaffs_WriteChunkToNAND(dev,chunk,data,spare);
>            }
>            attempts++;
>#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
>            if(writeOk)
>            {
>                unsigned char 
>rbData[YAFFS_BYTES_PER_CHUNK];
>                yaffs_Spare rbSpare;

>                // Readback & verify
>                // If verify fails, then delete 
>this chunk and try again
>                // To verify we compare 
>everything except the block and
>                // page status bytes.
>                // NB We check a raw read 
>without ECC correction applied

>if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))
>                {
>                    // Didn't verify

>                    writeOk = 0;
>                }

>            }
>#endif
>            if(writeOk)
>            {
>                // Copy the data into the write buffer.
>                // NB We do this at the end to 
>prevent duplicates in the case of a write error.
>                //Todo

>yaffs_HandleWriteChunkOk(dev,chunk,data,spare);
>            }
>            else
>            {
>                yaffs_HandleWriteChunkError(dev,chunk);
>            }
>        }

>    } while(chunk >= 0 && ! writeOk);

>    if(attempts > 1)
>    {
>        T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write 
>required %d attempts" TENDSTR),attempts));
>        dev->nRetriedWrites+= (attempts - 1);
>    }

>    return chunk;
>}