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annotate yaffs_packedtags2.c @ 322:1206ae06f03d

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More python example stuff
author charles
date Tue, 13 Oct 2009 04:20:05 +0100
parents b0136b8000f9
children 5d34d18f33e5
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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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4 * Copyright (C) 2002-2007 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_tagsvalidity.h"
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17
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18 /* This code packs a set of extended tags into a binary structure for
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19 * NAND storage
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20 */
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21
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22 /* Some of the information is "extra" struff which can be packed in to
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23 * speed scanning
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24 * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
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25 */
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26
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27 /* Extra flags applied to chunkId */
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28
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29 #define EXTRA_HEADER_INFO_FLAG 0x80000000
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30 #define EXTRA_SHRINK_FLAG 0x40000000
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31 #define EXTRA_SHADOWS_FLAG 0x20000000
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32 #define EXTRA_SPARE_FLAGS 0x10000000
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33
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34 #define ALL_EXTRA_FLAGS 0xF0000000
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35
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36 /* Also, the top 4 bits of the object Id are set to the object type. */
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37 #define EXTRA_OBJECT_TYPE_SHIFT (28)
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38 #define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
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39
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40
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41 static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
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42 {
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43 T(YAFFS_TRACE_MTD,
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44 (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
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45 ptt->objectId, ptt->chunkId, ptt->byteCount,
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46 ptt->sequenceNumber));
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47 }
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48 static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
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49 {
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50 yaffs_DumpPackedTags2TagsPart(&pt->t);
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51 }
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52
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53 static void yaffs_DumpTags2(const yaffs_ExtendedTags *t)
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54 {
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55 T(YAFFS_TRACE_MTD,
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56 (TSTR
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57 ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
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58 TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
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59 t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
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60 t->sequenceNumber));
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61
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62 }
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63
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64 void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
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65 const yaffs_ExtendedTags *t)
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66 {
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67 ptt->chunkId = t->chunkId;
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68 ptt->sequenceNumber = t->sequenceNumber;
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69 ptt->byteCount = t->byteCount;
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70 ptt->objectId = t->objectId;
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71
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72 if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
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73 /* Store the extra header info instead */
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74 /* We save the parent object in the chunkId */
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75 ptt->chunkId = EXTRA_HEADER_INFO_FLAG
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76 | t->extraParentObjectId;
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77 if (t->extraIsShrinkHeader)
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78 ptt->chunkId |= EXTRA_SHRINK_FLAG;
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79 if (t->extraShadows)
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80 ptt->chunkId |= EXTRA_SHADOWS_FLAG;
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81
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82 ptt->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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83 ptt->objectId |=
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84 (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
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85
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86 if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
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87 ptt->byteCount = t->extraEquivalentObjectId;
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88 else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
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89 ptt->byteCount = t->extraFileLength;
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90 else
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91 ptt->byteCount = 0;
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92 }
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93
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94 yaffs_DumpPackedTags2TagsPart(ptt);
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95 yaffs_DumpTags2(t);
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96 }
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97
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98
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99 void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
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100 {
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101 yaffs_PackTags2TagsPart(&pt->t, t);
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102
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103 #ifndef YAFFS_IGNORE_TAGS_ECC
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104 {
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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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109 #endif
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110 }
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111
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112
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113 void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags *t,
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114 yaffs_PackedTags2TagsPart *ptt)
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115 {
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116
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117 memset(t, 0, sizeof(yaffs_ExtendedTags));
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118
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119 yaffs_InitialiseTags(t);
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120
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121 if (ptt->sequenceNumber != 0xFFFFFFFF) {
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122 t->blockBad = 0;
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123 t->chunkUsed = 1;
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124 t->objectId = ptt->objectId;
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125 t->chunkId = ptt->chunkId;
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126 t->byteCount = ptt->byteCount;
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127 t->chunkDeleted = 0;
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128 t->serialNumber = 0;
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129 t->sequenceNumber = ptt->sequenceNumber;
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130
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131 /* Do extra header info stuff */
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132
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133 if (ptt->chunkId & EXTRA_HEADER_INFO_FLAG) {
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134 t->chunkId = 0;
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135 t->byteCount = 0;
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136
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137 t->extraHeaderInfoAvailable = 1;
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138 t->extraParentObjectId =
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139 ptt->chunkId & (~(ALL_EXTRA_FLAGS));
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140 t->extraIsShrinkHeader =
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141 (ptt->chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
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142 t->extraShadows =
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143 (ptt->chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
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144 t->extraObjectType =
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145 ptt->objectId >> EXTRA_OBJECT_TYPE_SHIFT;
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146 t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
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147
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148 if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
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149 t->extraEquivalentObjectId = ptt->byteCount;
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150 else
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151 t->extraFileLength = ptt->byteCount;
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152 }
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153 }
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154
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155 yaffs_DumpPackedTags2TagsPart(ptt);
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156 yaffs_DumpTags2(t);
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157
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158 }
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159
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160
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161 void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
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162 {
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163
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164 yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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165
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166 if (pt->t.sequenceNumber != 0xFFFFFFFF) {
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167 /* Page is in use */
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168 #ifndef YAFFS_IGNORE_TAGS_ECC
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169 {
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170 yaffs_ECCOther ecc;
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171 int result;
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172 yaffs_ECCCalculateOther((unsigned char *)&pt->t,
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173 sizeof
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174 (yaffs_PackedTags2TagsPart),
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175 &ecc);
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176 result =
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177 yaffs_ECCCorrectOther((unsigned char *)&pt->t,
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178 sizeof
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179 (yaffs_PackedTags2TagsPart),
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180 &pt->ecc, &ecc);
282
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181 switch (result) {
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182 case 0:
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183 eccResult = YAFFS_ECC_RESULT_NO_ERROR;
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184 break;
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185 case 1:
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186 eccResult = YAFFS_ECC_RESULT_FIXED;
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187 break;
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188 case -1:
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189 eccResult = YAFFS_ECC_RESULT_UNFIXED;
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190 break;
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191 default:
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192 eccResult = YAFFS_ECC_RESULT_UNKNOWN;
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193 }
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194 }
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195 #endif
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196 }
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197
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198 yaffs_UnpackTags2TagsPart(t, &pt->t);
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199
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200 t->eccResult = eccResult;
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201
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202 yaffs_DumpPackedTags2(pt);
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203 yaffs_DumpTags2(t);
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204
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205 }
211
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206