diff options
author | kaloz <kaloz@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2008-06-02 08:22:56 +0000 |
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committer | kaloz <kaloz@3c298f89-4303-0410-b956-a3cf2f4a3e73> | 2008-06-02 08:22:56 +0000 |
commit | 8540d5d19ebac6a3f30d82f36ff33f19d728f10b (patch) | |
tree | a3141c916b391658ab197350ee398aace4ad9f35 /target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c | |
parent | d2cb36d9c515ecd3f94864082cfe86f75796eeaf (diff) |
add generic 2.6.26 patches/files
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11323 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c')
-rw-r--r-- | target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c b/target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c new file mode 100644 index 000000000..e420f95da --- /dev/null +++ b/target/linux/generic-2.6/files-2.6.26/fs/yaffs2/yaffs_packedtags2.c @@ -0,0 +1,182 @@ +/* + * 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. + */ + +#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. + */ + +/* Extra flags applied to chunkId */ + +#define EXTRA_HEADER_INFO_FLAG 0x80000000 +#define EXTRA_SHRINK_FLAG 0x40000000 +#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. */ +#define EXTRA_OBJECT_TYPE_SHIFT (28) +#define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT) + +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)); +} + +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)); + +} + +void yaffs_PackTags2(yaffs_PackedTags2 * pt, 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 */ + /* We save the parent object in the chunkId */ + pt->t.chunkId = EXTRA_HEADER_INFO_FLAG + | t->extraParentObjectId; + if (t->extraIsShrinkHeader) { + pt->t.chunkId |= EXTRA_SHRINK_FLAG; + } + if (t->extraShadows) { + pt->t.chunkId |= EXTRA_SHADOWS_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; + } else { + pt->t.byteCount = 0; + } + } + + yaffs_DumpPackedTags2(pt); + 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) +{ + + 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 = YAFFS_ECC_RESULT_NO_ERROR; + } +#else + { + 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: + t->eccResult = YAFFS_ECC_RESULT_NO_ERROR; + break; + case 1: + t->eccResult = YAFFS_ECC_RESULT_FIXED; + break; + case -1: + t->eccResult = YAFFS_ECC_RESULT_UNFIXED; + break; + default: + t->eccResult = YAFFS_ECC_RESULT_UNKNOWN; + } + } +#endif + t->blockBad = 0; + t->chunkUsed = 1; + t->objectId = pt->t.objectId; + t->chunkId = pt->t.chunkId; + t->byteCount = pt->t.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->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->extraShadows = + (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0; + t->extraObjectType = + pt->t.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; + } + } + } + + yaffs_DumpPackedTags2(pt); + yaffs_DumpTags2(t); + +} |