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1 /* |
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2 * Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * Implementation for the CDosharedDataBase class |
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16 * |
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17 */ |
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18 |
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19 |
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20 #include "dosshareddatabase.h" |
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21 #include "dosclientserver.h" |
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22 #include "dosserver.h" |
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23 #include "shareddatafilesystemnotifier.h" |
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24 #include "dosclishareddata.h" |
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25 #include "dos_debug.h" |
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26 #include <e32svr.h> |
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27 |
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28 // CONSTANTS |
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29 _LIT( KSDReserveFileName, "C:\\Private\\101f6efa\\reserve.bin" ); |
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30 _LIT(KSDPath, "C:\\Private\\101f6efa\\"); |
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31 |
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32 // Definitions for reserve file system |
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33 const TInt KSDLotsOfFreeDiskSpace = 1000000; |
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34 const TInt KSDFreeDiskSpaceOverhead = 1024; |
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35 const TInt KSDReserveFileLoopMaxCount = 5; |
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36 |
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37 // ----------------------------------------------------------------------------- |
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38 // CDosSharedDataBase::CDosSharedDataBase* NewL() |
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39 // ----------------------------------------------------------------------------- |
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40 // |
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41 EXPORT_C CDosSharedDataBase* CDosSharedDataBase::NewL(CSharedDataFileSystemNotifier* fileSystemNotifier) |
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42 { |
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43 COM_TRACE_1( "[DOSSERVER]\t CDosSharedDataBase* CDosSharedDataBase::NewL(0x%x)", fileSystemNotifier ); |
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44 CDosSharedDataBase* self = NewLC(fileSystemNotifier); |
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45 CleanupStack::Pop(); |
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46 return self; |
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47 } |
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48 |
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49 // ----------------------------------------------------------------------------- |
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50 // CDosSharedDataBase::CDosSharedDataBase* NewLC() |
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51 // ----------------------------------------------------------------------------- |
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52 // |
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53 EXPORT_C CDosSharedDataBase* CDosSharedDataBase::NewLC(CSharedDataFileSystemNotifier* fileSystemNotifier) |
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54 { |
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55 COM_TRACE_1( "[DOSSERVER]\t CDosSharedDataBase* CDosSharedDataBase::NewL(0x%x)", fileSystemNotifier ); |
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56 CDosSharedDataBase* self = new( ELeave ) CDosSharedDataBase(); |
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57 CleanupStack::PushL( self ); |
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58 self->ConstructL( fileSystemNotifier ); |
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59 return self; |
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60 } |
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61 |
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62 // ----------------------------------------------------------------------------- |
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63 // CDosSharedDataBase::void ConstructL() |
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64 // ----------------------------------------------------------------------------- |
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65 // |
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66 void CDosSharedDataBase::ConstructL(CSharedDataFileSystemNotifier* fileSystemNotifier) |
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67 { |
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68 COM_TRACE_1( "[DOSSERVER]\t CDosSharedDataBase::ConstructL(0x%x)", fileSystemNotifier ); |
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69 iFileSystemNotifier = fileSystemNotifier; |
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70 iFreeDiskSpaceRequest = 0; |
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71 |
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72 TInt err( iFs.Connect() ); |
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73 if ( err < 0 ) |
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74 { |
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75 User::LeaveIfError( err ); |
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76 } |
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77 User::LeaveIfError(iFs.ShareProtected()); |
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78 } |
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79 |
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80 // Destructor |
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81 CDosSharedDataBase::~CDosSharedDataBase() |
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82 { |
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83 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::~CDosSharedDataBase()" ); |
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84 if ( iFileSystemNotifier ) |
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85 { |
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86 iFileSystemNotifier->Cancel(); |
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87 } |
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88 iFs.Close(); |
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89 } |
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90 |
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91 // |
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92 // --------------------------------------------------------- |
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93 // CDosSharedDataBase::ExecuteMessageL |
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94 // --------------------------------------------------------- |
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95 // |
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96 EXPORT_C TInt CDosSharedDataBase::ExecuteMessageL(const RMessage2& aMessage) |
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97 { |
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98 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::ExecuteMessageL(...)" ); |
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99 switch (aMessage.Function()) |
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100 { |
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101 case ERequestFreeDiskSpace: |
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102 { |
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103 |
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104 TInt amount( aMessage.Int0() ); |
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105 COM_TRACE_2( "CDosSharedDataBase::ExecuteMessageL() case ERequestFreeDiskSpace, amount = %d iFreeDiskSpaceRequest = %d", amount, iFreeDiskSpaceRequest ); |
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106 |
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107 if ( amount > iFreeDiskSpaceRequest ) |
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108 { |
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109 if ( amount > KSDReserveFileMaxSize ) |
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110 { |
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111 amount = KSDReserveFileMaxSize; |
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112 } |
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113 |
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114 COM_TRACE_2( "CDosSharedDataBase::ExecuteMessageL() case ERequestFreeDiskSpace, amount = %d iFreeDiskSpaceRequest = %d", amount, iFreeDiskSpaceRequest ); |
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115 |
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116 iFreeDiskSpaceRequest = amount; |
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117 RequestFreeDiskSpace( &iFreeDiskSpaceRequest ); |
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118 } |
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119 |
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120 TInt err(KErrNone); |
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121 return err; |
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122 } |
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123 |
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124 case ERequestFreeDiskSpaceCancel: |
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125 { |
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126 COM_TRACE_1( "CDosSharedDataBase::ExecuteMessageL() case ERequestFreeDiskSpaceCancel iFreeDiskSpaceRequest = %d", iFreeDiskSpaceRequest ); |
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127 |
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128 if ( iFreeDiskSpaceRequest > 0 ) |
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129 { |
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130 // iFreeDiskSpaceRequest = 0; |
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131 RequestFreeDiskSpaceCancel(&iFreeDiskSpaceRequest); |
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132 } |
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133 |
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134 TInt err(KErrNone); |
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135 return err; |
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136 } |
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137 |
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138 default: |
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139 COM_TRACE_( "[DOSSERVER]\t Panic: Illegal function!" ); |
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140 PanicClient(aMessage,EPanicIllegalFunction); |
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141 return KErrNone; |
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142 } |
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143 } |
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144 |
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145 // |
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146 // --------------------------------------------------------- |
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147 // CDosSharedDataBase::RequestFreeDiskSpace |
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148 // --------------------------------------------------------- |
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149 // |
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150 void CDosSharedDataBase::RequestFreeDiskSpace( TInt* aRequest ) |
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151 { |
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152 __ASSERT_DEBUG( aRequest, User::Invariant() ); |
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153 |
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154 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::RequestFreeDiskSpace" ); |
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155 |
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156 TInt* currentFreeDiskSpaceRequest = iFileSystemNotifier->iServer.CurrentFreeDiskSpaceRequest(); |
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157 if ( !currentFreeDiskSpaceRequest || // no request earlier |
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158 aRequest == currentFreeDiskSpaceRequest || // current request updated |
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159 *aRequest > *currentFreeDiskSpaceRequest ) // new higher request |
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160 { |
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161 COM_TRACE_( "CDosSharedDataBase::RequestFreeDiskSpace - no request earlier,..." ); |
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162 iFileSystemNotifier->Cancel(); |
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163 iFileSystemNotifier->iServer.SetCurrentFreeDiskSpaceRequest(aRequest); |
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164 SetReserveFileSize( *aRequest ); |
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165 } |
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166 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::RequestFreeDiskSpace - return" ); |
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167 } |
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168 |
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169 // ----------------------------------------------------------------------------- |
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170 // CDosSharedDataBase::RequestFreeDiskSpaceCancel() |
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171 // ----------------------------------------------------------------------------- |
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172 void CDosSharedDataBase::RequestFreeDiskSpaceCancel( TInt* aRequest ) |
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173 { |
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174 __ASSERT_DEBUG( aRequest, User::Invariant() ); |
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175 |
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176 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::RequestFreeDiskSpaceCancel" ); |
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177 |
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178 TInt* currentFreeDiskSpaceRequest = iFileSystemNotifier->iServer.CurrentFreeDiskSpaceRequest(); |
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179 if ( currentFreeDiskSpaceRequest == aRequest ) |
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180 { |
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181 |
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182 //*currentFreeDiskSpaceRequest = KSDReserveFileMaxSize; |
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183 *currentFreeDiskSpaceRequest = 0; |
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184 |
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185 iFileSystemNotifier->iServer.SetCurrentFreeDiskSpaceRequest( currentFreeDiskSpaceRequest ); |
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186 |
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187 // Adjust the size of the reserve file to the maximum size |
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188 |
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189 // SetReserveFileSize( KSDReserveFileMaxSize); |
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190 SetReserveFileSize( 0 ); |
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191 } |
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192 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::RequestFreeDiskSpaceCancel - return" ); |
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193 |
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194 } |
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195 |
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196 // ----------------------------------------------------------------------------- |
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197 // CDosSharedDataBase::SetReserveFileSize() |
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198 // ----------------------------------------------------------------------------- |
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199 |
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200 void CDosSharedDataBase::SetReserveFileSize( const TInt aRequiredFreeDiskSpace ) |
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201 { |
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202 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::SetReserveFileSize" ); |
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203 |
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204 TInt newSize( 0 ); |
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205 TInt currentSize( 0 ); |
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206 TInt freeSpace( KSDLotsOfFreeDiskSpace ); |
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207 |
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208 TVolumeInfo info; |
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209 TInt ret = iFs.Volume( info, EDriveC ); |
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210 |
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211 if ( ret == KErrNone ) |
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212 { |
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213 RFile file; |
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214 ret = file.Open( iFs, KSDReserveFileName, EFileShareAny | EFileWrite ); |
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215 |
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216 switch ( ret ) |
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217 { |
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218 case KErrPathNotFound: |
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219 iFs.MkDirAll( KSDPath ); // no break here |
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220 case KErrNotFound: |
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221 ret = file.Create( iFs, KSDReserveFileName, |
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222 EFileShareAny | EFileWrite ); |
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223 default: {} |
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224 } |
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225 |
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226 if ( ret == KErrNone ) |
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227 { |
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228 ret = file.Size( currentSize ); |
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229 |
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230 COM_TRACE_( "SharedData: SetReserveFileSize() start" ); |
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231 COM_TRACE_1( "SharedData: Free disk space: %d", TInt(info.iFree) ); |
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232 COM_TRACE_1( "SharedData: Reserve file size: %d", currentSize ); |
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233 |
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234 if ( ret == KErrNone ) |
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235 { |
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236 if ( info.iFree < freeSpace ) |
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237 { |
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238 freeSpace = I64INT(info.iFree); |
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239 } |
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240 |
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241 // to make sure infinite loop can never happen |
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242 TInt loopCounter( 0 ); |
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243 |
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244 // *** START of reserve file size altering section *** |
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245 |
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246 do { |
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247 loopCounter++; |
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248 |
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249 newSize = freeSpace + currentSize - aRequiredFreeDiskSpace; |
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250 |
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251 if ( aRequiredFreeDiskSpace > 0 ) |
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252 { |
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253 newSize -= KSDFreeDiskSpaceOverhead; |
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254 } |
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255 |
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256 if ( newSize < 0 ) |
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257 { |
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258 newSize = 0; |
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259 } |
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260 |
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261 else if ( newSize > KSDReserveFileMaxSize ) |
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262 { |
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263 newSize = KSDReserveFileMaxSize; |
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264 } |
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265 |
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266 // set the file size to 'newSize' here |
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267 |
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268 TInt position( 0 ); |
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269 ret = file.Seek( ESeekEnd, position ); |
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270 |
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271 if ( ret == KErrNone ) |
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272 { |
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273 if ( position > newSize ) |
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274 { |
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275 ret = file.SetSize( newSize ); |
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276 |
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277 COM_TRACE_1( "SharedData: SetSize returned: %d", ret ); |
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278 |
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279 file.Flush(); |
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280 } |
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281 |
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282 else if ( position < newSize ) |
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283 { |
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284 TInt toBeWritten( newSize - position ); |
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285 |
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286 HBufC8* buffer = HBufC8::New( toBeWritten ); |
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287 |
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288 // Write the new data in cycles, |
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289 // halving the total amount to be written in |
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290 // every cycle until we get below 1024 bytes. |
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291 // This leads to max 6 cycles and ensures that |
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292 // as much as possible gets reserved back. |
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293 |
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294 if ( buffer ) |
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295 { |
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296 while ( ret != KErrDiskFull && |
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297 toBeWritten > 1024 ) |
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298 { |
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299 buffer->Des().SetLength( toBeWritten >> 1 ); |
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300 |
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301 ret = file.Write( *buffer ); |
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302 |
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303 if ( ret == KErrNone ) |
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304 { |
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305 ret = file.Flush(); |
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306 } |
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307 |
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308 toBeWritten -= ( toBeWritten >> 1 ); |
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309 } |
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310 |
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311 buffer->Des().SetLength( toBeWritten ); |
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312 ret = file.Write( *buffer ); |
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313 |
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314 if ( ret == KErrNone ) |
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315 { |
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316 ret = file.Flush(); |
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317 } |
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318 |
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319 delete buffer; |
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320 } |
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321 } |
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322 } |
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323 |
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324 // update reserve file size info |
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325 file.Size( currentSize ); |
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326 |
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327 // update free disk space info |
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328 ret = iFs.Volume( info, EDriveC ); |
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329 |
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330 if ( ret == KErrNone ) |
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331 { |
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332 freeSpace = KSDLotsOfFreeDiskSpace; |
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333 |
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334 if ( info.iFree < freeSpace ) |
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335 { |
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336 freeSpace = I64INT(info.iFree); |
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337 } |
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338 } |
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339 |
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340 COM_TRACE_( "SharedData: SetReserveFileSize() loop" ); |
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341 COM_TRACE_1( "SharedData: Free disk space: %d", (TInt) info.iFree ); |
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342 COM_TRACE_1( "SharedData: Expected reserve file size: %d", newSize ); |
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343 COM_TRACE_1( "SharedData: Reserve file size: %d", currentSize ); |
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344 } |
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345 |
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346 while ( loopCounter < KSDReserveFileLoopMaxCount && |
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347 aRequiredFreeDiskSpace > 0 && |
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348 currentSize > 0 && |
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349 freeSpace < aRequiredFreeDiskSpace ); |
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350 |
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351 // *** END of reserve file size altering section *** |
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352 |
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353 // If there are no more free disk space requests but we didn't |
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354 // manage to increase the reserve file size back to max, get |
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355 // notification from file server when there is more disk space. |
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356 |
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357 if ( aRequiredFreeDiskSpace == 0 && |
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358 currentSize < KSDReserveFileMaxSize ) |
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359 { |
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360 iFileSystemNotifier->Start( freeSpace + 2500, iFs, this ); |
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361 } |
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362 } |
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363 |
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364 file.Close(); |
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365 } |
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366 } |
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367 |
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368 COM_TRACE_1( "SharedData: Free disk space: %d", (TInt) info.iFree ); |
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369 COM_TRACE_1( "SharedData: Expected reserve file size: %d", newSize ); |
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370 COM_TRACE_1( "SharedData: Reserve file size: %d", currentSize ); |
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371 |
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372 COM_TRACE_( "[DOSSERVER]\t CDosSharedDataBase::SetReserveFileSize - return" ); |
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373 } |