Mercurial > yaffs-ecoscentric-gpl

annotate yaffs_packedtags2.c @ 424:d21d6fd33e63

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yaffs Fix incorrect handling of deletion flag Move the reading of the deleted flag so that it picks up any changes. Notw we need a value on the stack because the object might get freed and we don't want to access a hanging pointer. Signed-off-by: Charles Manning <cdhmanning@gmail.com>
author Charles Manning <cdhmanning@gmail.com>
date Thu, 13 May 2010 14:29:16 +1200
parents b5309c9b6d7f
children
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1 /*
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2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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3 *
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Charles Manning <cdhmanning@gmail.com>
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4 * Copyright (C) 2002-2010 Aleph One Ltd.
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5 * for Toby Churchill Ltd and Brightstar Engineering
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6 *
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7 * Created by Charles Manning <charles@aleph1.co.uk>
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8 *
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9 * This program is free software; you can redistribute it and/or modify
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10 * it under the terms of the GNU General Public License version 2 as
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11 * published by the Free Software Foundation.
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12 */
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13
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14 #include "yaffs_packedtags2.h"
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15 #include "yportenv.h"
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16 #include "yaffs_trace.h"
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17 #include "yaffs_tagsvalidity.h"
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18
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19 /* This code packs a set of extended tags into a binary structure for
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20 * NAND storage
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21 */
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22
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23 /* Some of the information is "extra" struff which can be packed in to
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24 * speed scanning
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25 * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
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26 */
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28 /* Extra flags applied to chunkId */
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29
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30 #define EXTRA_HEADER_INFO_FLAG 0x80000000
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31 #define EXTRA_SHRINK_FLAG 0x40000000
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32 #define EXTRA_SHADOWS_FLAG 0x20000000
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33 #define EXTRA_SPARE_FLAGS 0x10000000
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34
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35 #define ALL_EXTRA_FLAGS 0xF0000000
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36
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37 /* Also, the top 4 bits of the object Id are set to the object type. */
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38 #define EXTRA_OBJECT_TYPE_SHIFT (28)
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39 #define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
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41
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42 static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
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43 {
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44 T(YAFFS_TRACE_MTD,
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45 (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
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46 ptt->objectId, ptt->chunkId, ptt->byteCount,
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47 ptt->sequenceNumber));
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48 }
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49 static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
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50 {
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51 yaffs_DumpPackedTags2TagsPart(&pt->t);
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52 }
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53
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54 static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
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55 {
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56 T(YAFFS_TRACE_MTD,
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57 (TSTR
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58 ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
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59 TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
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60 t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
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61 t->sequenceNumber));
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62
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63 }
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65 void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
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66 const yaffs_ExtendedTags *t)
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67 {
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68 ptt->chunkId = t->chunkId;
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69 ptt->sequenceNumber = t->sequenceNumber;
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70 ptt->byteCount = t->byteCount;
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71 ptt->objectId = t->objectId;
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72
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73 if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
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74 /* Store the extra header info instead */
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75 /* We save the parent object in the chunkId */
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76 ptt->chunkId = EXTRA_HEADER_INFO_FLAG
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77 | t->extraParentObjectId;
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78 if (t->extraIsShrinkHeader)
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79 ptt->chunkId |= EXTRA_SHRINK_FLAG;
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80 if (t->extraShadows)
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81 ptt->chunkId |= EXTRA_SHADOWS_FLAG;
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82
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83 ptt->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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84 ptt->objectId |=
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85 (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
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86
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87 if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
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88 ptt->byteCount = t->extraEquivalentObjectId;
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89 else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
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90 ptt->byteCount = t->extraFileLength;
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91 else
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92 ptt->byteCount = 0;
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93 }
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94
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95 yaffs_DumpPackedTags2TagsPart(ptt);
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96 yaffs_DumpTags2(t);
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97 }
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99
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100 void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC)
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101 {
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102 yaffs_PackTags2TagsPart(&pt->t, t);
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103
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104 if(tagsECC)
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105 yaffs_ECCCalculateOther((unsigned char *)&pt->t,
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106 sizeof(yaffs_PackedTags2TagsPart),
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107 &pt->ecc);
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108 }
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111 void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags *t,
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112 yaffs_PackedTags2TagsPart *ptt)
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113 {
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114
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115 memset(t, 0, sizeof(yaffs_ExtendedTags));
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116
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117 yaffs_InitialiseTags(t);
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118
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119 if (ptt->sequenceNumber != 0xFFFFFFFF) {
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120 t->blockBad = 0;
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121 t->chunkUsed = 1;
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122 t->objectId = ptt->objectId;
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123 t->chunkId = ptt->chunkId;
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124 t->byteCount = ptt->byteCount;
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125 t->chunkDeleted = 0;
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126 t->serialNumber = 0;
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127 t->sequenceNumber = ptt->sequenceNumber;
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128
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129 /* Do extra header info stuff */
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130
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131 if (ptt->chunkId & EXTRA_HEADER_INFO_FLAG) {
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132 t->chunkId = 0;
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133 t->byteCount = 0;
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134
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135 t->extraHeaderInfoAvailable = 1;
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136 t->extraParentObjectId =
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137 ptt->chunkId & (~(ALL_EXTRA_FLAGS));
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138 t->extraIsShrinkHeader =
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139 (ptt->chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
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140 t->extraShadows =
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141 (ptt->chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
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142 t->extraObjectType =
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143 ptt->objectId >> EXTRA_OBJECT_TYPE_SHIFT;
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144 t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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145
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146 if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
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147 t->extraEquivalentObjectId = ptt->byteCount;
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148 else
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149 t->extraFileLength = ptt->byteCount;
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150 }
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151 }
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152
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153 yaffs_DumpPackedTags2TagsPart(ptt);
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154 yaffs_DumpTags2(t);
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155
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156 }
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157
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158
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159 void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC)
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160 {
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161
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162 yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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163
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164 if (pt->t.sequenceNumber != 0xFFFFFFFF &&
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165 tagsECC){
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166 /* Chunk is in use and we need to do ECC */
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167
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168 yaffs_ECCOther ecc;
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169 int result;
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170 yaffs_ECCCalculateOther((unsigned char *)&pt->t,
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171 sizeof(yaffs_PackedTags2TagsPart),
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172 &ecc);
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173 result = yaffs_ECCCorrectOther((unsigned char *)&pt->t,
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174 sizeof(yaffs_PackedTags2TagsPart),
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175 &pt->ecc, &ecc);
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176 switch (result) {
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177 case 0:
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178 eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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179 break;
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180 case 1:
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181 eccResult = YAFFS_ECC_RESULT_FIXED;
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182 break;
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183 case -1:
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184 eccResult = YAFFS_ECC_RESULT_UNFIXED;
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185 break;
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186 default:
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187 eccResult = YAFFS_ECC_RESULT_UNKNOWN;
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188 }
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189 }
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190
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191 yaffs_UnpackTags2TagsPart(t, &pt->t);
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192
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193 t->eccResult = eccResult;
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194
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195 yaffs_DumpPackedTags2(pt);
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196 yaffs_DumpTags2(t);
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197 }
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198