mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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0008c16f33
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13022 3c298f89-4303-0410-b956-a3cf2f4a3e73
183 lines
4.7 KiB
C
183 lines
4.7 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2007 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "yaffs_packedtags2.h"
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#include "yportenv.h"
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#include "yaffs_tagsvalidity.h"
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/* This code packs a set of extended tags into a binary structure for
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* NAND storage
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*/
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/* Some of the information is "extra" struff which can be packed in to
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* speed scanning
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* This is defined by having the EXTRA_HEADER_INFO_FLAG set.
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*/
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/* Extra flags applied to chunkId */
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#define EXTRA_HEADER_INFO_FLAG 0x80000000
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#define EXTRA_SHRINK_FLAG 0x40000000
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#define EXTRA_SHADOWS_FLAG 0x20000000
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#define EXTRA_SPARE_FLAGS 0x10000000
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#define ALL_EXTRA_FLAGS 0xF0000000
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/* Also, the top 4 bits of the object Id are set to the object type. */
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#define EXTRA_OBJECT_TYPE_SHIFT (28)
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#define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
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static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 * pt)
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{
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T(YAFFS_TRACE_MTD,
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(TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
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pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
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pt->t.sequenceNumber));
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}
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static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
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{
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T(YAFFS_TRACE_MTD,
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(TSTR
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("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
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"%d del %d ser %d seq %d"
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TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
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t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
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t->sequenceNumber));
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}
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void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
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{
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pt->t.chunkId = t->chunkId;
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pt->t.sequenceNumber = t->sequenceNumber;
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pt->t.byteCount = t->byteCount;
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pt->t.objectId = t->objectId;
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if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
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/* Store the extra header info instead */
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/* We save the parent object in the chunkId */
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pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
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| t->extraParentObjectId;
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if (t->extraIsShrinkHeader) {
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pt->t.chunkId |= EXTRA_SHRINK_FLAG;
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}
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if (t->extraShadows) {
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pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
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}
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pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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pt->t.objectId |=
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(t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
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if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
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pt->t.byteCount = t->extraEquivalentObjectId;
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} else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
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pt->t.byteCount = t->extraFileLength;
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} else {
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pt->t.byteCount = 0;
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}
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}
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yaffs_DumpPackedTags2(pt);
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yaffs_DumpTags2(t);
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#ifndef YAFFS_IGNORE_TAGS_ECC
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{
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yaffs_ECCCalculateOther((unsigned char *)&pt->t,
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sizeof(yaffs_PackedTags2TagsPart),
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&pt->ecc);
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}
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#endif
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}
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void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
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{
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memset(t, 0, sizeof(yaffs_ExtendedTags));
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yaffs_InitialiseTags(t);
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if (pt->t.sequenceNumber != 0xFFFFFFFF) {
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/* Page is in use */
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#ifdef YAFFS_IGNORE_TAGS_ECC
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{
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t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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}
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#else
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{
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yaffs_ECCOther ecc;
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int result;
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yaffs_ECCCalculateOther((unsigned char *)&pt->t,
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sizeof
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(yaffs_PackedTags2TagsPart),
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&ecc);
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result =
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yaffs_ECCCorrectOther((unsigned char *)&pt->t,
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sizeof
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(yaffs_PackedTags2TagsPart),
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&pt->ecc, &ecc);
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switch(result){
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case 0:
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t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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break;
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case 1:
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t->eccResult = YAFFS_ECC_RESULT_FIXED;
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break;
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case -1:
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t->eccResult = YAFFS_ECC_RESULT_UNFIXED;
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break;
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default:
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t->eccResult = YAFFS_ECC_RESULT_UNKNOWN;
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}
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}
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#endif
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t->blockBad = 0;
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t->chunkUsed = 1;
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t->objectId = pt->t.objectId;
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t->chunkId = pt->t.chunkId;
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t->byteCount = pt->t.byteCount;
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t->chunkDeleted = 0;
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t->serialNumber = 0;
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t->sequenceNumber = pt->t.sequenceNumber;
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/* Do extra header info stuff */
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if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
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t->chunkId = 0;
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t->byteCount = 0;
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t->extraHeaderInfoAvailable = 1;
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t->extraParentObjectId =
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pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
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t->extraIsShrinkHeader =
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(pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
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t->extraShadows =
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(pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
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t->extraObjectType =
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pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
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t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
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t->extraEquivalentObjectId = pt->t.byteCount;
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} else {
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t->extraFileLength = pt->t.byteCount;
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}
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}
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}
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yaffs_DumpPackedTags2(pt);
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yaffs_DumpTags2(t);
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}
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