--- linux-2.6.27.6/fs/yaffs2/yaffs_mtdif2.c	1970-01-01 08:00:00.000000000 +0800
+++ linux-2.6.27.6.yaffs/fs/yaffs2/yaffs_mtdif2.c	2011-05-08 18:01:08.000000000 +0800
@@ -0,0 +1,254 @@
+/*
+ * 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.
+ */
+
+/* mtd interface for YAFFS2 */
+
+const char *yaffs_mtdif2_c_version =
+	"$Id: yaffs_mtdif2.c,v 1.27 2010/02/18 01:18:04 charles Exp $";
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_mtdif2.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+#include "yaffs_linux.h"
+
+/* NB For use with inband tags....
+ * We assume that the data buffer is of size totalBytersPerChunk so that we can also
+ * use it to load the tags.
+ */
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev, int chunkInNAND,
+				      const __u8 *data,
+				      const yaffs_ExtendedTags *tags)
+{
+	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
+	struct mtd_oob_ops ops;
+#else
+	size_t dummy;
+#endif
+	int retval = 0;
+
+	loff_t addr;
+
+	yaffs_PackedTags2 pt;
+
+	int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+	void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t : (void *)&pt;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+
+
+	addr  = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+	if (!data || !tags)
+		BUG();
+	else if (dev->param.inbandTags) {
+		yaffs_PackedTags2TagsPart *pt2tp;
+		pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
+		yaffs_PackTags2TagsPart(pt2tp, tags);
+	} else
+		yaffs_PackTags2(&pt, tags, !dev->param.noTagsECC);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+	ops.mode = MTD_OOB_AUTO;
+	ops.ooblen = (dev->param.inbandTags) ? 0 : packed_tags_size;
+	ops.len = dev->param.totalBytesPerChunk;
+	ops.ooboffs = 0;
+	ops.datbuf = (__u8 *)data;
+	ops.oobbuf = (dev->param.inbandTags) ? NULL : packed_tags_ptr;
+	retval = mtd->write_oob(mtd, addr, &ops);
+
+#else
+	if (!dev->param.inbandTags) {
+		retval =
+		    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
+				   &dummy, data, (__u8 *) packed_tags_ptr, NULL);
+	} else {
+		retval =
+		    mtd->write(mtd, addr, dev->param.totalBytesPerChunk, &dummy,
+			       data);
+	}
+#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 = yaffs_DeviceToContext(dev)->mtd;
+#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
+	struct mtd_oob_ops ops;
+#endif
+	size_t dummy;
+	int retval = 0;
+	int localData = 0;
+
+	loff_t addr = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
+
+	yaffs_PackedTags2 pt;
+
+	int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+	void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t: (void *)&pt;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+
+	if (dev->param.inbandTags) {
+
+		if (!data) {
+			localData = 1;
+			data = yaffs_GetTempBuffer(dev, __LINE__);
+		}
+
+
+	}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+	if (dev->param.inbandTags || (data && !tags))
+		retval = mtd->read(mtd, addr, dev->param.totalBytesPerChunk,
+				&dummy, data);
+	else if (tags) {
+		ops.mode = MTD_OOB_AUTO;
+		ops.ooblen = packed_tags_size;
+		ops.len = data ? dev->nDataBytesPerChunk : packed_tags_size;
+		ops.ooboffs = 0;
+		ops.datbuf = data;
+		ops.oobbuf = yaffs_DeviceToContext(dev)->spareBuffer;
+		retval = mtd->read_oob(mtd, addr, &ops);
+	}
+#else
+	if (!dev->param.inbandTags && data && tags) {
+
+		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 (!dev->param.inbandTags && tags)
+			retval =
+			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
+					  dev->spareBuffer);
+	}
+#endif
+
+
+	if (dev->param.inbandTags) {
+		if (tags) {
+			yaffs_PackedTags2TagsPart *pt2tp;
+			pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
+			yaffs_UnpackTags2TagsPart(tags, pt2tp);
+		}
+	} else {
+		if (tags) {
+			memcpy(packed_tags_ptr, yaffs_DeviceToContext(dev)->spareBuffer, packed_tags_size);
+			yaffs_UnpackTags2(tags, &pt, !dev->param.noTagsECC);
+		}
+	}
+
+	if (localData)
+		yaffs_ReleaseTempBuffer(dev, data, __LINE__);
+
+	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 = yaffs_DeviceToContext(dev)->mtd;
+	int retval;
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
+
+	retval =
+	    mtd->block_markbad(mtd,
+			       blockNo * dev->param.nChunksPerBlock *
+			       dev->param.totalBytesPerChunk);
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+
+}
+
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
+			    yaffs_BlockState *state, __u32 *sequenceNumber)
+{
+	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	int retval;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
+	retval =
+	    mtd->block_isbad(mtd,
+			     blockNo * dev->param.nChunksPerBlock *
+			     dev->param.totalBytesPerChunk);
+
+	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->param.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;
+}
+
