yaffs_mtdif2.c

这是ARM yaffs文件系统

/*
 * 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 <[e-mail]>
 *
 * 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.
 */

/* mtd interface for YAFFS2 */

const char *yaffs_mtdif2_c_version =
    "$Id: yaffs_mtdif2.c,v 1.17 2007/02/14 01:09:06 wookey Exp $";

#include "yportenv.h"


#include "yaffs_mtdif2.h"

#include "linux/mtd/mtd.h"
#include "linux/types.h"
#include "linux/time.h"

#include "yaffs_packedtags2.h"

int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
				      const __u8 * data,
				      const yaffs_ExtendedTags * tags)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	struct mtd_oob_ops ops;
#else
	size_t dummy;
#endif
	int retval = 0;

	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;

	yaffs_PackedTags2 pt;

	T(YAFFS_TRACE_MTD,
	  (TSTR
	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
	    TENDSTR), chunkInNAND, data, tags));

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	if (tags)
		yaffs_PackTags2(&pt, tags);
	else
		BUG(); /* both tags and data should always be present */

	if (data) {
		ops.mode = MTD_OOB_AUTO;
		ops.ooblen = sizeof(pt);
		ops.len = dev->nDataBytesPerChunk;
		ops.ooboffs = 0;
		ops.datbuf = (__u8 *)data;
		ops.oobbuf = (void *)&pt;
		retval = mtd->write_oob(mtd, addr, &ops);
	} else
		BUG(); /* both tags and data should always be present */
#else
	if (tags) {
		yaffs_PackTags2(&pt, tags);
	}

	if (data && tags) {
		if (dev->useNANDECC)
			retval =
			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
					   &dummy, data, (__u8 *) & pt, NULL);
		else
			retval =
			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
					   &dummy, data, (__u8 *) & pt, NULL);
	} else {
		if (data)
			retval =
			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
				       data);
		if (tags)
			retval =
			    mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
					   (__u8 *) & pt);

	}
#endif

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}

int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
				       __u8 * data, yaffs_ExtendedTags * tags)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	struct mtd_oob_ops ops;
#endif
	size_t dummy;
	int retval = 0;

	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;

	yaffs_PackedTags2 pt;

	T(YAFFS_TRACE_MTD,
	  (TSTR
	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
	    TENDSTR), chunkInNAND, data, tags));

#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
	if (data && !tags)
		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
				&dummy, data);
	else if (tags) {
		ops.mode = MTD_OOB_AUTO;
		ops.ooblen = sizeof(pt);
		ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
		ops.ooboffs = 0;
		ops.datbuf = data;
		ops.oobbuf = dev->spareBuffer;
		retval = mtd->read_oob(mtd, addr, &ops);
	}
#else
	if (data && tags) {
		if (dev->useNANDECC) {
			retval =
			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
					  &dummy, data, dev->spareBuffer,
					  NULL);
		} else {
			retval =
			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
					  &dummy, data, dev->spareBuffer,
					  NULL);
		}
	} else {
		if (data)
			retval =
			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
				      data);
		if (tags)
			retval =
			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
					  dev->spareBuffer);
	}
#endif

	memcpy(&pt, dev->spareBuffer, sizeof(pt));

	if (tags)
		yaffs_UnpackTags2(tags, &pt);
	
	if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
		tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}

int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
	int retval;
	T(YAFFS_TRACE_MTD,
	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));

	retval =
	    mtd->block_markbad(mtd,
			       blockNo * dev->nChunksPerBlock *
			       dev->nDataBytesPerChunk);

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;

}

int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
			    yaffs_BlockState * state, int *sequenceNumber)
{
	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
	int retval;

	T(YAFFS_TRACE_MTD,
	  (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
	retval =
	    mtd->block_isbad(mtd,
			     blockNo * dev->nChunksPerBlock *
			     dev->nDataBytesPerChunk);

	if (retval) {
		T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));

		*state = YAFFS_BLOCK_STATE_DEAD;
		*sequenceNumber = 0;
	} else {
		yaffs_ExtendedTags t;
		nandmtd2_ReadChunkWithTagsFromNAND(dev,
						   blockNo *
						   dev->nChunksPerBlock, NULL,
						   &t);

		if (t.chunkUsed) {
			*sequenceNumber = t.sequenceNumber;
			*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
		} else {
			*sequenceNumber = 0;
			*state = YAFFS_BLOCK_STATE_EMPTY;
		}
	}
	T(YAFFS_TRACE_MTD,
	  (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
	   *state));

	if (retval == 0)
		return YAFFS_OK;
	else
		return YAFFS_FAIL;
}