Mercurial > yaffs-ecoscentric-gpl

annotate yaffs_checkptrw.c @ 422:71c8b6ae0a24

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Merge branch 'master' of ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2
author Charles Manning <cdhmanning@gmail.com>
date Fri, 07 May 2010 10:08:22 +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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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_checkptrw.h"
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15 #include "yaffs_getblockinfo.h"
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16
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17 static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
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18 {
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19 int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
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20
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21 T(YAFFS_TRACE_CHECKPOINT,
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22 (TSTR("checkpt blocks available = %d" TENDSTR),
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23 blocksAvailable));
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24
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25 return (blocksAvailable <= 0) ? 0 : 1;
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26 }
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27
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28
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29 static int yaffs_CheckpointErase(yaffs_Device *dev)
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30 {
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31 int i;
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32
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33 if (!dev->param.eraseBlockInNAND)
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34 return 0;
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35 T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
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36 dev->internalStartBlock, dev->internalEndBlock));
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37
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38 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
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39 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
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40 if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
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41 T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
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42
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43 dev->nBlockErasures++;
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44
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45 if (dev->param.eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
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46 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
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47 dev->nErasedBlocks++;
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48 dev->nFreeChunks += dev->param.nChunksPerBlock;
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49 } else {
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50 dev->param.markNANDBlockBad(dev, i);
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51 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
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52 }
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53 }
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54 }
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55
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56 dev->blocksInCheckpoint = 0;
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57
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58 return 1;
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59 }
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60
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61
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62 static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
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63 {
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64 int i;
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65 int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
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66 T(YAFFS_TRACE_CHECKPOINT,
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67 (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
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68 dev->nErasedBlocks, dev->param.nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
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69
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70 if (dev->checkpointNextBlock >= 0 &&
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71 dev->checkpointNextBlock <= dev->internalEndBlock &&
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72 blocksAvailable > 0) {
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74 for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
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75 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
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76 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
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77 dev->checkpointNextBlock = i + 1;
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78 dev->checkpointCurrentBlock = i;
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79 T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i));
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80 return;
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81 }
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82 }
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83 }
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84 T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR)));
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85
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86 dev->checkpointNextBlock = -1;
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87 dev->checkpointCurrentBlock = -1;
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88 }
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89
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90 static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
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91 {
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92 int i;
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93 yaffs_ExtendedTags tags;
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94
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95 T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
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96 dev->blocksInCheckpoint, dev->checkpointNextBlock));
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97
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98 if (dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
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99 for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
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100 int chunk = i * dev->param.nChunksPerBlock;
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101 int realignedChunk = chunk - dev->chunkOffset;
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102
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103 dev->param.readChunkWithTagsFromNAND(dev, realignedChunk,
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104 NULL, &tags);
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105 T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
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106 i, tags.objectId, tags.sequenceNumber, tags.eccResult));
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107
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108 if (tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
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109 /* Right kind of block */
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110 dev->checkpointNextBlock = tags.objectId;
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111 dev->checkpointCurrentBlock = i;
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112 dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
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113 dev->blocksInCheckpoint++;
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114 T(YAFFS_TRACE_CHECKPOINT, (TSTR("found checkpt block %d"TENDSTR), i));
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115 return;
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116 }
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117 }
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118
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119 T(YAFFS_TRACE_CHECKPOINT, (TSTR("found no more checkpt blocks"TENDSTR)));
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120
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121 dev->checkpointNextBlock = -1;
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122 dev->checkpointCurrentBlock = -1;
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123 }
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124
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125
127
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126 int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
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127 {
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128
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129
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130 dev->checkpointOpenForWrite = forWriting;
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131
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132 /* Got the functions we need? */
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133 if (!dev->param.writeChunkWithTagsToNAND ||
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134 !dev->param.readChunkWithTagsFromNAND ||
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135 !dev->param.eraseBlockInNAND ||
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136 !dev->param.markNANDBlockBad)
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137 return 0;
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138
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139 if (forWriting && !yaffs_CheckpointSpaceOk(dev))
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140 return 0;
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141
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142 if (!dev->checkpointBuffer)
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143 dev->checkpointBuffer = YMALLOC_DMA(dev->param.totalBytesPerChunk);
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144 if (!dev->checkpointBuffer)
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145 return 0;
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146
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147
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148 dev->checkpointPageSequence = 0;
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149 dev->checkpointByteCount = 0;
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150 dev->checkpointSum = 0;
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151 dev->checkpointXor = 0;
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152 dev->checkpointCurrentBlock = -1;
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153 dev->checkpointCurrentChunk = -1;
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154 dev->checkpointNextBlock = dev->internalStartBlock;
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155
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156 /* Erase all the blocks in the checkpoint area */
271
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diff changeset
157 if (forWriting) {
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diff changeset
158 memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
129
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parents: 127
diff changeset
159 dev->checkpointByteOffset = 0;
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parents: 127
diff changeset
160 return yaffs_CheckpointErase(dev);
127
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parents:
diff changeset
161 } else {
129
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parents: 127
diff changeset
162 int i;
127
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163 /* Set to a value that will kick off a read */
146
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parents: 132
diff changeset
164 dev->checkpointByteOffset = dev->nDataBytesPerChunk;
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
165 /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
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parents: 127
diff changeset
166 * going to be way more than we need */
131
99e93a234aba Fix some checkpoint stuff, add qsort
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parents: 129
diff changeset
167 dev->blocksInCheckpoint = 0;
152
043b849c6ea3 Fix block offset with checkpointing
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parents: 150
diff changeset
168 dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
169 dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
283
3d49e1185b42 Handle malloc failure in checkpoint open.
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parents: 271
diff changeset
170 if(!dev->checkpointBlockList)
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parents: 271
diff changeset
171 return 0;
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parents: 271
diff changeset
172
271
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173 for (i = 0; i < dev->checkpointMaxBlocks; i++)
129
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parents: 127
diff changeset
174 dev->checkpointBlockList[i] = -1;
127
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175 }
198
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parents: 176
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176
127
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177 return 1;
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178 }
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179
176
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parents: 171
diff changeset
180 int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
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parents: 171
diff changeset
181 {
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diff changeset
182 __u32 compositeSum;
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diff changeset
183 compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
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184 *sum = compositeSum;
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185 return 1;
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parents: 171
diff changeset
186 }
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187
127
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188 static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
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189 {
129
5bc7e85eac5b Add non-partitioned checkpointing
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diff changeset
190 int chunk;
159
5f4c756ac1d3 Fix offset problem in checkpt code
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parents: 158
diff changeset
191 int realignedChunk;
127
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192
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193 yaffs_ExtendedTags tags;
198
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194
271
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195 if (dev->checkpointCurrentBlock < 0) {
129
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parents: 127
diff changeset
196 yaffs_CheckpointFindNextErasedBlock(dev);
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parents: 127
diff changeset
197 dev->checkpointCurrentChunk = 0;
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parents: 127
diff changeset
198 }
198
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diff changeset
199
271
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200 if (dev->checkpointCurrentBlock < 0)
129
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diff changeset
201 return 0;
198
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diff changeset
202
127
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203 tags.chunkDeleted = 0;
129
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parents: 127
diff changeset
204 tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
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parents: 127
diff changeset
205 tags.chunkId = dev->checkpointPageSequence + 1;
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parents: 127
diff changeset
206 tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
146
1a32267ef1c1 Add large NAND support and improve retirement handling
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diff changeset
207 tags.byteCount = dev->nDataBytesPerChunk;
271
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diff changeset
208 if (dev->checkpointCurrentChunk == 0) {
132
f0d1a05787e4 Fix problem with checkpoint free space handling
charles <charles>
parents: 131
diff changeset
209 /* First chunk we write for the block? Set block state to
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parents: 131
diff changeset
210 checkpoint */
271
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diff changeset
211 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointCurrentBlock);
132
f0d1a05787e4 Fix problem with checkpoint free space handling
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parents: 131
diff changeset
212 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
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parents: 131
diff changeset
213 dev->blocksInCheckpoint++;
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parents: 131
diff changeset
214 }
198
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diff changeset
215
356
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parents: 309
diff changeset
216 chunk = dev->checkpointCurrentBlock * dev->param.nChunksPerBlock + dev->checkpointCurrentChunk;
159
5f4c756ac1d3 Fix offset problem in checkpt code
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parents: 158
diff changeset
217
198
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diff changeset
218
271
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diff changeset
219 T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
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diff changeset
220 chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk, tags.objectId, tags.chunkId));
198
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parents: 176
diff changeset
221
159
5f4c756ac1d3 Fix offset problem in checkpt code
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parents: 158
diff changeset
222 realignedChunk = chunk - dev->chunkOffset;
198
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parents: 176
diff changeset
223
288
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parents: 283
diff changeset
224 dev->nPageWrites++;
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parents: 283
diff changeset
225
356
7ee0cc4ba753 Rationalise context and parameter handling
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parents: 309
diff changeset
226 dev->param.writeChunkWithTagsToNAND(dev, realignedChunk,
271
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diff changeset
227 dev->checkpointBuffer, &tags);
129
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parents: 127
diff changeset
228 dev->checkpointByteOffset = 0;
198
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diff changeset
229 dev->checkpointPageSequence++;
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
230 dev->checkpointCurrentChunk++;
356
7ee0cc4ba753 Rationalise context and parameter handling
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parents: 309
diff changeset
231 if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock) {
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
232 dev->checkpointCurrentChunk = 0;
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
233 dev->checkpointCurrentBlock = -1;
127
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234 }
271
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diff changeset
235 memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
198
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diff changeset
236
127
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237 return 1;
f8fc631acf25 Checkpointing changes
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parents:
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238 }
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parents:
diff changeset
239
129
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diff changeset
240
271
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diff changeset
241 int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
127
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242 {
271
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diff changeset
243 int i = 0;
127
f8fc631acf25 Checkpointing changes
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244 int ok = 1;
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diff changeset
245
198
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diff changeset
246
127
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parents:
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247 __u8 * dataBytes = (__u8 *)data;
198
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parents: 176
diff changeset
248
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diff changeset
249
127
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diff changeset
250
271
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diff changeset
251 if (!dev->checkpointBuffer)
127
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parents:
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252 return 0;
198
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diff changeset
253
271
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diff changeset
254 if (!dev->checkpointOpenForWrite)
176
570d9d4cac30 Adding checkpoint and robustness improvements
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parents: 171
diff changeset
255 return -1;
127
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diff changeset
256
271
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diff changeset
257 while (i < nBytes && ok) {
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diff changeset
258 dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes;
176
570d9d4cac30 Adding checkpoint and robustness improvements
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parents: 171
diff changeset
259 dev->checkpointSum += *dataBytes;
570d9d4cac30 Adding checkpoint and robustness improvements
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parents: 171
diff changeset
260 dev->checkpointXor ^= *dataBytes;
198
b7f785925166 Cleanup patch - Remove all trailing whitespace and fix a few typos.
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parents: 176
diff changeset
261
127
f8fc631acf25 Checkpointing changes
charles <charles>
parents:
diff changeset
262 dev->checkpointByteOffset++;
f8fc631acf25 Checkpointing changes
charles <charles>
parents:
diff changeset
263 i++;
f8fc631acf25 Checkpointing changes
charles <charles>
parents:
diff changeset
264 dataBytes++;
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parents:
diff changeset
265 dev->checkpointByteCount++;
198
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parents: 176
diff changeset
266
b7f785925166 Cleanup patch - Remove all trailing whitespace and fix a few typos.
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parents: 176
diff changeset
267
271
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diff changeset
268 if (dev->checkpointByteOffset < 0 ||
198
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wookey <wookey>
parents: 176
diff changeset
269 dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
127
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
270 ok = yaffs_CheckpointFlushBuffer(dev);
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
271 }
198
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diff changeset
272
271
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diff changeset
273 return i;
127
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
274 }
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
275
f8fc631acf25 Checkpointing changes
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276 int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
277 {
271
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diff changeset
278 int i = 0;
127
f8fc631acf25 Checkpointing changes
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parents:
diff changeset
279 int ok = 1;
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diff changeset
280 yaffs_ExtendedTags tags;
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
281
198
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parents: 176
diff changeset
282
129
5bc7e85eac5b Add non-partitioned checkpointing
charles <charles>
parents: 127
diff changeset
283 int chunk;
159
5f4c756ac1d3 Fix offset problem in checkpt code
charles <charles>
parents: 158
diff changeset
284 int realignedChunk;
127
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parents:
diff changeset
285
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parents:
diff changeset
286 __u8 *dataBytes = (__u8 *)data;
198
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parents: 176
diff changeset
287
271
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diff changeset
288 if (!dev->checkpointBuffer)
127
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charles <charles>
parents:
diff changeset
289 return 0;
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parents:
diff changeset
290
271
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diff changeset
291 if (dev->checkpointOpenForWrite)
176
570d9d4cac30 Adding checkpoint and robustness improvements
charles <charles>
parents: 171
diff changeset
292 return -1;
570d9d4cac30 Adding checkpoint and robustness improvements
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parents: 171
diff changeset
293
271
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diff changeset
294 while (i < nBytes && ok) {
198
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parents: 176
diff changeset
295
b7f785925166 Cleanup patch - Remove all trailing whitespace and fix a few typos.
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parents: 176
diff changeset
296
271
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diff changeset
297 if (dev->checkpointByteOffset < 0 ||
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diff changeset
298 dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
198
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diff changeset
299
271
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diff changeset
300 if (dev->checkpointCurrentBlock < 0) {
129
5bc7e85eac5b Add non-partitioned checkpointing
charles <charles>
parents: 127
diff changeset
301 yaffs_CheckpointFindNextCheckpointBlock(dev);
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
302 dev->checkpointCurrentChunk = 0;
127
f8fc631acf25 Checkpointing changes
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parents:
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303 }
198
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diff changeset
304
271
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diff changeset
305 if (dev->checkpointCurrentBlock < 0)
129
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
306 ok = 0;
5bc7e85eac5b Add non-partitioned checkpointing
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parents: 127
diff changeset
307 else {
271
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diff changeset
308 chunk = dev->checkpointCurrentBlock *
356
7ee0cc4ba753 Rationalise context and parameter handling
charles <charles>
parents: 309
diff changeset
309 dev->param.nChunksPerBlock +
271
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diff changeset
310 dev->checkpointCurrentChunk;
127
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parents:
diff changeset
311
159
5f4c756ac1d3 Fix offset problem in checkpt code
charles <charles>
parents: 158
diff changeset
312 realignedChunk = chunk - dev->chunkOffset;
288
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charles <charles>
parents: 283
diff changeset
313
b20bce8ec7a2 Rationalise stats gathering for nand access. Does not instrument mounting.
charles <charles>
parents: 283
diff changeset
314 dev->nPageReads++;
159
5f4c756ac1d3 Fix offset problem in checkpt code
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parents: 158
diff changeset
315
271
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diff changeset
316 /* read in the next chunk */
c0dfae9e8073 Major whitespace/style changes to match Linux checkpatch.pl code style
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diff changeset
317 /* printf("read checkpoint page %d\n",dev->checkpointPage); */
356
7ee0cc4ba753 Rationalise context and parameter handling
charles <charles>
parents: 309
diff changeset
318 dev->param.readChunkWithTagsFromNAND(dev,
271
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319 realignedChunk,
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320 dev->checkpointBuffer,
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321 &tags);
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322
271
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323 if (tags.chunkId != (dev->checkpointPageSequence + 1) ||
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324 tags.eccResult > YAFFS_ECC_RESULT_FIXED ||
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325 tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
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326 ok = 0;
127
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327
129
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328 dev->checkpointByteOffset = 0;
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329 dev->checkpointPageSequence++;
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330 dev->checkpointCurrentChunk++;
198
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331
356
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332 if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock)
129
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333 dev->checkpointCurrentBlock = -1;
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334 }
127
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335 }
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336
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337 if (ok) {
127
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338 *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
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339 dev->checkpointSum += *dataBytes;
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340 dev->checkpointXor ^= *dataBytes;
127
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341 dev->checkpointByteOffset++;
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342 i++;
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343 dataBytes++;
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344 dev->checkpointByteCount++;
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345 }
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346 }
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347
127
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348 return i;
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349 }
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350
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351 int yaffs_CheckpointClose(yaffs_Device *dev)
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352 {
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353
271
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354 if (dev->checkpointOpenForWrite) {
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355 if (dev->checkpointByteOffset != 0)
127
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356 yaffs_CheckpointFlushBuffer(dev);
305
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357 } else if(dev->checkpointBlockList){
129
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358 int i;
271
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359 for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
305
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360 int blk = dev->checkpointBlockList[i];
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361 yaffs_BlockInfo *bi = NULL;
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362 if( dev->internalStartBlock <= blk && blk <= dev->internalEndBlock)
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363 bi = yaffs_GetBlockInfo(dev, blk);
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364 if (bi && bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
129
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365 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
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366 else {
271
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367 /* Todo this looks odd... */
129
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368 }
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369 }
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370 YFREE(dev->checkpointBlockList);
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371 dev->checkpointBlockList = NULL;
127
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372 }
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373
356
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374 dev->nFreeChunks -= dev->blocksInCheckpoint * dev->param.nChunksPerBlock;
129
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375 dev->nErasedBlocks -= dev->blocksInCheckpoint;
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376
198
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377
271
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378 T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
127
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379 dev->checkpointByteCount));
198
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380
271
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381 if (dev->checkpointBuffer) {
198
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382 /* free the buffer */
127
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383 YFREE(dev->checkpointBuffer);
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384 dev->checkpointBuffer = NULL;
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385 return 1;
271
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386 } else
127
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387 return 0;
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388 }
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389
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390 int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
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391 {
305
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392 /* Erase the checkpoint data */
127
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393
309
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394 T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
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395 dev->blocksInCheckpoint));
127
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396
129
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397 return yaffs_CheckpointErase(dev);
127
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398 }
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parents:
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399
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charles <charles>
parents:
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400
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charles <charles>
parents:
diff changeset
401