/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * yaffs_packedtags2.c: Tags packing for YAFFS2
- *
- * Copyright (C) 2002 Aleph One Ltd.
+ * 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 Lesser General Public License
- * version 2.1 as published by the Free Software Foundation.
+ * 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.
*/
-
+
#include "yaffs_packedtags2.h"
#include "yportenv.h"
#include "yaffs_tagsvalidity.h"
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
-// This code packs a set of extended tags into a binary structure for NAND storage
-
-// Some of the information is "extra" struff which can be packed in to speed scanning
-// This is defined by having the EXTRA_HEADER_INFO_FLAG set.
-
-
-// Extra flags applied to chunkId
+/* Extra flags applied to chunkId */
#define EXTRA_HEADER_INFO_FLAG 0x80000000
#define EXTRA_SHRINK_FLAG 0x40000000
-#define EXTRA_SPARE_FLAGS 0x30000000
+#define EXTRA_SHADOWS_FLAG 0x20000000
+#define EXTRA_SPARE_FLAGS 0x10000000
#define ALL_EXTRA_FLAGS 0xF0000000
-
-
-// Also, the top 4 bits of the object Id are set to the object type.
+/* Also, the top 4 bits of the object Id are set to the object type. */
#define EXTRA_OBJECT_TYPE_SHIFT (28)
#define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
-
+static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
+{
+ T(YAFFS_TRACE_MTD,
+ (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
+ ptt->objectId, ptt->chunkId, ptt->byteCount,
+ ptt->sequenceNumber));
+}
static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
{
- T(YAFFS_TRACE_MTD,(TSTR("packed tags obj %d chunk %d byte %d seq %d"TENDSTR),pt->t.objectId,pt->t.chunkId,pt->t.byteCount,pt->t.sequenceNumber));
+ yaffs_DumpPackedTags2TagsPart(&pt->t);
}
static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
{
- T(YAFFS_TRACE_MTD,(TSTR("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"TENDSTR),
- t->eccResult, t->blockBad, t->chunkUsed, t->objectId, t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber, t->sequenceNumber));
-
+ T(YAFFS_TRACE_MTD,
+ (TSTR
+ ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
+ TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
+ t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
+ t->sequenceNumber));
+
}
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
+void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
+ const yaffs_ExtendedTags *t)
{
- pt->t.chunkId = t->chunkId;
- pt->t.sequenceNumber = t->sequenceNumber;
- pt->t.byteCount = t->byteCount;
- pt->t.objectId = t->objectId;
-
- if(t->chunkId == 0 && t->extraHeaderInfoAvailable)
- {
- // Store the extra header info instead
- pt->t.chunkId = EXTRA_HEADER_INFO_FLAG | t->extraParentObjectId; // We save the parent object in the chunkId
- if(t->extraIsShrinkHeader)
- {
- pt->t.chunkId |= EXTRA_SHRINK_FLAG;
- }
-
- pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
- pt->t.objectId |= (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
-
- if(t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
- {
- pt->t.byteCount = t->extraEquivalentObjectId;
- }
- else if(t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
- {
- pt->t.byteCount = t->extraFileLength;
- }
+ ptt->chunkId = t->chunkId;
+ ptt->sequenceNumber = t->sequenceNumber;
+ ptt->byteCount = t->byteCount;
+ ptt->objectId = t->objectId;
+
+ if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
+ /* Store the extra header info instead */
+ /* We save the parent object in the chunkId */
+ ptt->chunkId = EXTRA_HEADER_INFO_FLAG
+ | t->extraParentObjectId;
+ if (t->extraIsShrinkHeader)
+ ptt->chunkId |= EXTRA_SHRINK_FLAG;
+ if (t->extraShadows)
+ ptt->chunkId |= EXTRA_SHADOWS_FLAG;
+
+ ptt->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+ ptt->objectId |=
+ (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
+
+ if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+ ptt->byteCount = t->extraEquivalentObjectId;
+ else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
+ ptt->byteCount = t->extraFileLength;
else
- {
- pt->t.byteCount = 0;
- }
+ ptt->byteCount = 0;
}
-
- yaffs_DumpPackedTags2(pt);
+
+ yaffs_DumpPackedTags2TagsPart(ptt);
yaffs_DumpTags2(t);
-
-#ifndef YAFFS_IGNORE_TAGS_ECC
- {
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc);
- }
-#endif
}
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+
+void yaffs_PackTags2(yaffs_Device *dev, yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
{
+ yaffs_PackTags2TagsPart(&pt->t, t);
+
+ if(!dev->noTagsECC)
+ yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+ sizeof(yaffs_PackedTags2TagsPart),
+ &pt->ecc);
+}
+
+
+void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags *t,
+ yaffs_PackedTags2TagsPart *ptt)
+{
+
+ memset(t, 0, sizeof(yaffs_ExtendedTags));
-
- memset(t,0,sizeof(yaffs_ExtendedTags));
-
yaffs_InitialiseTags(t);
-
- if(pt->t.sequenceNumber != 0xFFFFFFFF)
- {
- // Page is in use
-#ifdef YAFFS_IGNORE_TAGS_ECC
- {
- t->eccResult = 0;
- }
-#else
- {
- yaffs_ECCOther ecc;
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&ecc);
- t->eccResult = yaffs_ECCCorrectOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc,&ecc);
- }
-#endif
+
+ if (ptt->sequenceNumber != 0xFFFFFFFF) {
t->blockBad = 0;
t->chunkUsed = 1;
- t->objectId = pt->t.objectId;
- t->chunkId = pt->t.chunkId;
- t->byteCount = pt->t.byteCount;
+ t->objectId = ptt->objectId;
+ t->chunkId = ptt->chunkId;
+ t->byteCount = ptt->byteCount;
t->chunkDeleted = 0;
t->serialNumber = 0;
- t->sequenceNumber = pt->t.sequenceNumber;
-
- // Do extra header info stuff
-
- if(pt->t.chunkId & EXTRA_HEADER_INFO_FLAG)
- {
+ t->sequenceNumber = ptt->sequenceNumber;
+
+ /* Do extra header info stuff */
+
+ if (ptt->chunkId & EXTRA_HEADER_INFO_FLAG) {
t->chunkId = 0;
t->byteCount = 0;
-
+
t->extraHeaderInfoAvailable = 1;
- t->extraParentObjectId = pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
- t->extraIsShrinkHeader = (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
- t->extraObjectType = pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
+ t->extraParentObjectId =
+ ptt->chunkId & (~(ALL_EXTRA_FLAGS));
+ t->extraIsShrinkHeader =
+ (ptt->chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
+ t->extraShadows =
+ (ptt->chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+ t->extraObjectType =
+ ptt->objectId >> EXTRA_OBJECT_TYPE_SHIFT;
t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-
- if(t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
- {
- t->extraEquivalentObjectId = pt->t.byteCount;
- }
- else
- {
- t->extraFileLength = pt->t.byteCount;
- }
+
+ if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
+ t->extraEquivalentObjectId = ptt->byteCount;
+ else
+ t->extraFileLength = ptt->byteCount;
}
}
- yaffs_DumpPackedTags2(pt);
+ yaffs_DumpPackedTags2TagsPart(ptt);
yaffs_DumpTags2(t);
}
+
+void yaffs_UnpackTags2(yaffs_Device *dev, yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+{
+
+ yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+
+ if (pt->t.sequenceNumber != 0xFFFFFFFF &&
+ !dev->noTagsECC){
+ /* Chunk is in use and we need to do ECC */
+
+ yaffs_ECCOther ecc;
+ int result;
+ yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+ sizeof(yaffs_PackedTags2TagsPart),
+ &ecc);
+ result = yaffs_ECCCorrectOther((unsigned char *)&pt->t,
+ sizeof(yaffs_PackedTags2TagsPart),
+ &pt->ecc, &ecc);
+ switch (result) {
+ case 0:
+ eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+ break;
+ case 1:
+ eccResult = YAFFS_ECC_RESULT_FIXED;
+ break;
+ case -1:
+ eccResult = YAFFS_ECC_RESULT_UNFIXED;
+ break;
+ default:
+ eccResult = YAFFS_ECC_RESULT_UNKNOWN;
+ }
+ }
+
+ yaffs_UnpackTags2TagsPart(t, &pt->t);
+
+ t->eccResult = eccResult;
+
+ yaffs_DumpPackedTags2(pt);
+ yaffs_DumpTags2(t);
+}
+
projects / yaffs2.git / blobdiff