---- a/fs/yaffs2/yaffs_mtdif1-compat.c
-+++ /dev/null
-@@ -1,434 +0,0 @@
--From ian@brightstareng.com Fri May 18 15:06:49 2007
--From ian@brightstareng.com Fri May 18 15:08:21 2007
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--From: Ian McDonnell <ian@brightstareng.com>
--To: David Goodenough <david.goodenough@linkchoose.co.uk>
--Subject: Re: something tested this time -- yaffs_mtdif1-compat.c
--Date: Fri, 18 May 2007 10:06:49 -0400
--User-Agent: KMail/1.9.1
--References: <200705142207.06909.ian@brightstareng.com> <200705171131.53536.ian@brightstareng.com> <200705181334.32166.david.goodenough@linkchoose.co.uk>
--In-Reply-To: <200705181334.32166.david.goodenough@linkchoose.co.uk>
--Cc: Andrea Conti <alyf@alyf.net>,
-- Charles Manning <manningc2@actrix.gen.nz>
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--
--David, Andrea,
--
--On Friday 18 May 2007 08:34, you wrote:
--> Yea team. With this fix in place (I put it in the wrong place
--> at first) I can now mount and ls the Yaffs partition without
--> an error messages!
--
--Good news!
--
--Attached is a newer yaffs_mtdif1.c with a bandaid to help the
--2.6.18 and 2.6.19 versions of MTD not trip on the oob read.
--See the LINUX_VERSION_CODE conditional in
--nandmtd1_ReadChunkWithTagsFromNAND.
--
---imcd
--
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--Content-Type: text/x-csrc;
-- charset="iso-8859-15";
-- name="yaffs_mtdif1.c"
--Content-Transfer-Encoding: 7bit
--Content-Disposition: attachment;
-- filename="yaffs_mtdif1.c"
--
--/*
-- * YAFFS: Yet another FFS. A NAND-flash specific file system.
-- * yaffs_mtdif1.c NAND mtd interface functions for small-page NAND.
-- *
-- * Copyright (C) 2002 Aleph One Ltd.
-- * for Toby Churchill Ltd and Brightstar Engineering
-- *
-- * 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 module provides the interface between yaffs_nand.c and the
-- * MTD API. This version is used when the MTD interface supports the
-- * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
-- * and we have small-page NAND device.
-- *
-- * These functions are invoked via function pointers in yaffs_nand.c.
-- * This replaces functionality provided by functions in yaffs_mtdif.c
-- * and the yaffs_TagsCompatability functions in yaffs_tagscompat.c that are
-- * called in yaffs_mtdif.c when the function pointers are NULL.
-- * We assume the MTD layer is performing ECC (useNANDECC is true).
-- */
--
--#include "yportenv.h"
--#include "yaffs_guts.h"
--#include "yaffs_packedtags1.h"
--#include "yaffs_tagscompat.h" // for yaffs_CalcTagsECC
--
--#include "linux/kernel.h"
--#include "linux/version.h"
--#include "linux/types.h"
--#include "linux/mtd/mtd.h"
--
--/* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
--#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
--
--const char *yaffs_mtdif1_c_version = "$Id: yaffs_mtdif1-compat.c 13022 2008-10-22 06:51:06Z nbd $";
--
--#ifndef CONFIG_YAFFS_9BYTE_TAGS
--# define YTAG1_SIZE 8
--#else
--# define YTAG1_SIZE 9
--#endif
--
--#if 0
--/* Use the following nand_ecclayout with MTD when using
-- * CONFIG_YAFFS_9BYTE_TAGS and the older on-NAND tags layout.
-- * If you have existing Yaffs images and the byte order differs from this,
-- * adjust 'oobfree' to match your existing Yaffs data.
-- *
-- * This nand_ecclayout scatters/gathers to/from the old-yaffs layout with the
-- * pageStatus byte (at NAND spare offset 4) scattered/gathered from/to
-- * the 9th byte.
-- *
-- * Old-style on-NAND format: T0,T1,T2,T3,P,B,T4,T5,E0,E1,E2,T6,T7,E3,E4,E5
-- * We have/need PackedTags1 plus pageStatus: T0,T1,T2,T3,T4,T5,T6,T7,P
-- * where Tn are the tag bytes, En are MTD's ECC bytes, P is the pageStatus
-- * byte and B is the small-page bad-block indicator byte.
-- */
--static struct nand_ecclayout nand_oob_16 = {
-- .eccbytes = 6,
-- .eccpos = { 8, 9, 10, 13, 14, 15 },
-- .oobavail = 9,
-- .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
--};
--#endif
--
--/* Write a chunk (page) of data to NAND.
-- *
-- * Caller always provides ExtendedTags data which are converted to a more
-- * compact (packed) form for storage in NAND. A mini-ECC runs over the
-- * contents of the tags meta-data; used to valid the tags when read.
-- *
-- * - Pack ExtendedTags to PackedTags1 form
-- * - Compute mini-ECC for PackedTags1
-- * - Write data and packed tags to NAND.
-- *
-- * Note: Due to the use of the PackedTags1 meta-data which does not include
-- * a full sequence number (as found in the larger PackedTags2 form) it is
-- * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
-- * discarded and dirty. This is not ideal: newer NAND parts are supposed
-- * to be written just once. When Yaffs performs this operation, this
-- * function is called with a NULL data pointer -- calling MTD write_oob
-- * without data is valid usage (2.6.17).
-- *
-- * Any underlying MTD error results in YAFFS_FAIL.
-- * Returns YAFFS_OK or YAFFS_FAIL.
-- */
--int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
-- int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
--{
-- struct mtd_info * mtd = dev->genericDevice;
-- int chunkBytes = dev->nDataBytesPerChunk;
-- loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-- struct mtd_oob_ops ops;
-- yaffs_PackedTags1 pt1;
-- int retval;
--
-- /* we assume that PackedTags1 and yaffs_Tags are compatible */
-- compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
-- compile_time_assertion(sizeof(yaffs_Tags) == 8);
--
-- yaffs_PackTags1(&pt1, etags);
-- yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
--
-- /* When deleting a chunk, the upper layer provides only skeletal
-- * etags, one with chunkDeleted set. However, we need to update the
-- * tags, not erase them completely. So we use the NAND write property
-- * that only zeroed-bits stick and set tag bytes to all-ones and
-- * zero just the (not) deleted bit.
-- */
--#ifndef CONFIG_YAFFS_9BYTE_TAGS
-- if (etags->chunkDeleted) {
-- memset(&pt1, 0xff, 8);
-- /* clear delete status bit to indicate deleted */
-- pt1.deleted = 0;
-- }
--#else
-- ((__u8 *)&pt1)[8] = 0xff;
-- if (etags->chunkDeleted) {
-- memset(&pt1, 0xff, 8);
-- /* zero pageStatus byte to indicate deleted */
-- ((__u8 *)&pt1)[8] = 0;
-- }
--#endif
--
-- memset(&ops, 0, sizeof(ops));
-- ops.mode = MTD_OOB_AUTO;
-- ops.len = (data) ? chunkBytes : 0;
-- ops.ooblen = YTAG1_SIZE;
-- ops.datbuf = (__u8 *)data;
-- ops.oobbuf = (__u8 *)&pt1;
--
-- retval = mtd->write_oob(mtd, addr, &ops);
-- if (retval) {
-- yaffs_trace(YAFFS_TRACE_MTD,
-- "write_oob failed, chunk %d, mtd error %d\n",
-- chunkInNAND, retval);
-- }
-- return retval ? YAFFS_FAIL : YAFFS_OK;
--}
--
--/* Return with empty ExtendedTags but add eccResult.
-- */
--static int rettags(yaffs_ExtendedTags * etags, int eccResult, int retval)
--{
-- if (etags) {
-- memset(etags, 0, sizeof(*etags));
-- etags->eccResult = eccResult;
-- }
-- return retval;
--}
--
--/* Read a chunk (page) from NAND.
-- *
-- * Caller expects ExtendedTags data to be usable even on error; that is,
-- * all members except eccResult and blockBad are zeroed.
-- *
-- * - Check ECC results for data (if applicable)
-- * - Check for blank/erased block (return empty ExtendedTags if blank)
-- * - Check the PackedTags1 mini-ECC (correct if necessary/possible)
-- * - Convert PackedTags1 to ExtendedTags
-- * - Update eccResult and blockBad members to refect state.
-- *
-- * Returns YAFFS_OK or YAFFS_FAIL.
-- */
--int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
-- int chunkInNAND, __u8 * data, yaffs_ExtendedTags * etags)
--{
-- struct mtd_info * mtd = dev->genericDevice;
-- int chunkBytes = dev->nDataBytesPerChunk;
-- loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-- int eccres = YAFFS_ECC_RESULT_NO_ERROR;
-- struct mtd_oob_ops ops;
-- yaffs_PackedTags1 pt1;
-- int retval;
-- int deleted;
--
-- memset(&ops, 0, sizeof(ops));
-- ops.mode = MTD_OOB_AUTO;
-- ops.len = (data) ? chunkBytes : 0;
-- ops.ooblen = YTAG1_SIZE;
-- ops.datbuf = data;
-- ops.oobbuf = (__u8 *)&pt1;
--
--#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
-- /* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
-- * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
-- */
-- ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
--#endif
-- /* Read page and oob using MTD.
-- * Check status and determine ECC result.
-- */
-- retval = mtd->read_oob(mtd, addr, &ops);
-- if (retval) {
-- yaffs_trace(YAFFS_TRACE_MTD,
-- "read_oob failed, chunk %d, mtd error %d\n",
-- chunkInNAND, retval);
-- }
--
-- switch (retval) {
-- case 0:
-- /* no error */
-- break;
--
-- case -EUCLEAN:
-- /* MTD's ECC fixed the data */
-- eccres = YAFFS_ECC_RESULT_FIXED;
-- dev->eccFixed++;
-- break;
--
-- case -EBADMSG:
-- /* MTD's ECC could not fix the data */
-- dev->eccUnfixed++;
-- /* fall into... */
-- default:
-- rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
-- etags->blockBad = (mtd->block_isbad)(mtd, addr);
-- return YAFFS_FAIL;
-- }
--
-- /* Check for a blank/erased chunk.
-- */
-- if (yaffs_CheckFF((__u8 *)&pt1, 8)) {
-- /* when blank, upper layers want eccResult to be <= NO_ERROR */
-- return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
-- }
--
--#ifndef CONFIG_YAFFS_9BYTE_TAGS
-- /* Read deleted status (bit) then return it to it's non-deleted
-- * state before performing tags mini-ECC check. pt1.deleted is
-- * inverted.
-- */
-- deleted = !pt1.deleted;
-- pt1.deleted = 1;
--#else
-- (void) deleted; /* not used */
--#endif
--
-- /* Check the packed tags mini-ECC and correct if necessary/possible.
-- */
-- retval = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
-- switch (retval) {
-- case 0:
-- /* no tags error, use MTD result */
-- break;
-- case 1:
-- /* recovered tags-ECC error */
-- dev->tagsEccFixed++;
-- eccres = YAFFS_ECC_RESULT_FIXED;
-- break;
-- default:
-- /* unrecovered tags-ECC error */
-- dev->tagsEccUnfixed++;
-- return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
-- }
--
-- /* Unpack the tags to extended form and set ECC result.
-- * [set shouldBeFF just to keep yaffs_UnpackTags1 happy]
-- */
-- pt1.shouldBeFF = 0xFFFFFFFF;
-- yaffs_UnpackTags1(etags, &pt1);
-- etags->eccResult = eccres;
--
-- /* Set deleted state.
-- */
--#ifndef CONFIG_YAFFS_9BYTE_TAGS
-- etags->chunkDeleted = deleted;
--#else
-- etags->chunkDeleted = (yaffs_CountBits(((__u8 *)&pt1)[8]) < 7);
--#endif
-- return YAFFS_OK;
--}
--
--/* Mark a block bad.
-- *
-- * This is a persistant state.
-- * Use of this function should be rare.
-- *
-- * Returns YAFFS_OK or YAFFS_FAIL.
-- */
--int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
--{
-- struct mtd_info * mtd = dev->genericDevice;
-- int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
-- int retval;
--
-- yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", blockNo);
--
-- retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
-- return (retval) ? YAFFS_FAIL : YAFFS_OK;
--}
--
--/* Check any MTD prerequists.
-- *
-- * Returns YAFFS_OK or YAFFS_FAIL.
-- */
--static int nandmtd1_TestPrerequists(struct mtd_info * mtd)
--{
-- /* 2.6.18 has mtd->ecclayout->oobavail */
-- /* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
-- int oobavail = mtd->ecclayout->oobavail;
--
-- if (oobavail < YTAG1_SIZE) {
-- yaffs_trace(YAFFS_TRACE_ERROR,
-- "mtd device has only %d bytes for tags, need %d",
-- oobavail, YTAG1_SIZE);
-- return YAFFS_FAIL;
-- }
-- return YAFFS_OK;
--}
--
--/* Query for the current state of a specific block.
-- *
-- * Examine the tags of the first chunk of the block and return the state:
-- * - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
-- * - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
-- * - YAFFS_BLOCK_STATE_EMPTY, the block is clean
-- *
-- * Always returns YAFFS_OK.
-- */
--int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-- yaffs_BlockState * pState, int *pSequenceNumber)
--{
-- struct mtd_info * mtd = dev->genericDevice;
-- int chunkNo = blockNo * dev->nChunksPerBlock;
-- yaffs_ExtendedTags etags;
-- int state = YAFFS_BLOCK_STATE_DEAD;
-- int seqnum = 0;
-- int retval;
--
-- /* We don't yet have a good place to test for MTD config prerequists.
-- * Do it here as we are called during the initial scan.
-- */
-- if (nandmtd1_TestPrerequists(mtd) != YAFFS_OK) {
-- return YAFFS_FAIL;
-- }
--
-- retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
-- if (etags.blockBad) {
-- yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-- "block %d is marked bad", blockNo);
-- state = YAFFS_BLOCK_STATE_DEAD;
-- }
-- else if (etags.chunkUsed) {
-- state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
-- seqnum = etags.sequenceNumber;
-- }
-- else {
-- state = YAFFS_BLOCK_STATE_EMPTY;
-- }
--
-- *pState = state;
-- *pSequenceNumber = seqnum;
--
-- /* query always succeeds */
-- return YAFFS_OK;
--}
--
--#endif /*KERNEL_VERSION*/
--
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--
--
--
projects / openwrt.git / blobdiff