userlibandfileserver/fileserver/sfile/sf_debug.cpp
changeset 0 a41df078684a
child 62 4a8fed1c0ef6
child 90 947f0dc9f7a8
equal deleted inserted replaced
-1:000000000000 0:a41df078684a
       
     1 // Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies).
       
     2 // All rights reserved.
       
     3 // This component and the accompanying materials are made available
       
     4 // under the terms of the License "Eclipse Public License v1.0"
       
     5 // which accompanies this distribution, and is available
       
     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
       
     7 //
       
     8 // Initial Contributors:
       
     9 // Nokia Corporation - initial contribution.
       
    10 //
       
    11 // Contributors:
       
    12 //
       
    13 // Description:
       
    14 // f32\sfile\sf_debug.cpp
       
    15 // 
       
    16 //
       
    17 
       
    18 #include "sf_std.h"
       
    19 #include <f32dbg.h>
       
    20 #include "f32image.h"
       
    21 #include <F32plugin.h>
       
    22 #include "sf_file_cache.h"
       
    23 
       
    24 
       
    25 #if defined(_DEBUG) || defined(_DEBUG_RELEASE)
       
    26 
       
    27 //
       
    28 // ONLY INCLUDED IN DEBUG BUILDS
       
    29 //
       
    30 
       
    31 void PrintHeapSize(const TDesC& aMessage)
       
    32 //
       
    33 // Display the total memory available
       
    34 //
       
    35 	{
       
    36 
       
    37 	TInt biggest;
       
    38 	TInt heapSize = User::Allocator().Available(biggest);
       
    39 	RDebug::Print(_L("%S size=0x%x largest cell=0x%x"),&aMessage,heapSize,biggest);
       
    40 	}
       
    41 
       
    42 static void SetAllocFailure(const RMessage2* aMessage)
       
    43 //
       
    44 // Set alloc failure after allocCount allocations
       
    45 //
       
    46 	{
       
    47 
       
    48 	UserHeapAllocFailCount=aMessage->Int1();
       
    49 	KernHeapAllocFailCount=UserHeapAllocFailCount;
       
    50 	if (UserHeapAllocFailCount>=0)
       
    51 		{
       
    52 		__UHEAP_FAILNEXT(UserHeapAllocFailCount);
       
    53 		__KHEAP_FAILNEXT(KernHeapAllocFailCount);
       
    54 		}
       
    55 	else
       
    56 		{
       
    57 		__UHEAP_RESET;
       
    58 		__KHEAP_RESET;
       
    59 		}	
       
    60 	}
       
    61 
       
    62 TInt FsDebugFunction(CFsRequest* aRequest)
       
    63 //
       
    64 // SetAllocFailure - Set alloc failure after allocCount allocations
       
    65 // SetErrorCondition - Set simulated error failure
       
    66 // SetDebugRegister - Trigger tracing output
       
    67 // DebugNotify - Request notification of a file server event - .FSY specific
       
    68 //
       
    69 	{
       
    70 
       
    71 	TInt r=KErrNone;
       
    72 	const RMessage2* message=&(aRequest->Message());
       
    73 	switch (message->Int0())
       
    74 		{
       
    75 	case EFsSetAllocFailure: 
       
    76 		SetAllocFailure(message); 
       
    77 		break;
       
    78 	case EFsSetErrorCondition:
       
    79 		ErrorCondition=message->Int1();
       
    80 		ErrorCount=message->Int2();
       
    81 		break;
       
    82 	case EFsSetDebugRegister:
       
    83 		DebugReg=message->Int1();
       
    84 		break;
       
    85 	case EFsDebugNotify:
       
    86 		{
       
    87 		TUint notifyType=(aRequest->Message().Int2())&KDebugNotifyMask;
       
    88 		if (notifyType)
       
    89 			{
       
    90 			CDebugChangeInfo* info=new CDebugChangeInfo;
       
    91 			if(!info)
       
    92 				return(KErrNoMemory);
       
    93 			const RMessage2& m=aRequest->Message();
       
    94 			info->Initialise(notifyType,(TRequestStatus*)m.Ptr3(),m,aRequest->Session());
       
    95 			r=FsNotify::AddDebug(info);
       
    96 			if(r!=KErrNone)
       
    97 				delete(info);
       
    98 			else
       
    99 				aRequest->SetCompleted(EFalse);
       
   100 			}
       
   101 		else
       
   102 			r=KErrArgument;
       
   103 		break;
       
   104 		}
       
   105 	default:
       
   106 		break;
       
   107 		};
       
   108 	return(r);
       
   109 	}
       
   110 
       
   111 TBool SimulateError(const RMessage2* aMessage)
       
   112 //
       
   113 // Return an error message if ErrorCount<=0
       
   114 //
       
   115 	{
       
   116 	TInt function = aMessage->Function() & KIpcFunctionMask;
       
   117 	
       
   118 	if (ErrorCondition!=KErrNone && 
       
   119 		(
       
   120 		function!=EFsDebugFunction || aMessage->Int0()!=EFsSetErrorCondition) &&
       
   121 		function!=EFsNotifyChangeCancel &&
       
   122 		function!=EFsNotifyChangeCancelEx &&
       
   123 		function!=EFsNotifyDiskSpaceCancel &&
       
   124 		function!=EFsFormatSubClose && 
       
   125 		function!=EFsDirSubClose  && 
       
   126 		function!=EFsFileSubClose && 
       
   127 		function!=EFsRawSubClose &&
       
   128 		function!=EFsUnclamp &&
       
   129 
       
   130         //-- this operation must not fail. It can only fail if the client's thread has died.
       
   131         //-- in this case whole session will be cleaned up.
       
   132 		function!=EFsFileAdopt 
       
   133         )
       
   134 		{
       
   135 		if (ErrorCount<=0)
       
   136 			return(ETrue);
       
   137 		ErrorCount--;
       
   138 		}
       
   139 	return(EFalse);
       
   140 	}
       
   141 
       
   142 
       
   143 TPtrC GetFunctionName(TInt aFunction)
       
   144 //
       
   145 // Print number of alloc fails to complete a given function
       
   146 //
       
   147 	{
       
   148 
       
   149 	switch (aFunction)
       
   150 		{
       
   151 	case EFsDebugFunction: return _L("EFsDebugFunction");
       
   152 	case EFsAddFileSystem: return _L("EFsAddFileSystem");
       
   153 	case EFsRemoveFileSystem: return _L("EFsRemoveFileSystem");
       
   154 	case EFsMountFileSystem: return _L("EFsMountFileSystem");
       
   155 	case EFsNotifyChange: return _L("EFsNotifyChange");
       
   156 	case EFsNotifyChangeCancel: return _L("EFsNotifyChangeCancel");
       
   157 	case EFsDriveList: return _L("EFsDriveList");
       
   158 	case EFsDrive: return _L("EFsDrive");
       
   159 	case EFsVolume: return _L("EFsVolume");
       
   160 	case EFsSetVolume: return _L("EFsSetVolume");
       
   161 	case EFsSubst: return _L("EFsSubst");
       
   162 	case EFsSetSubst: return _L("EFsSetSubst");
       
   163 	case EFsRealName: return _L("EFsRealName");
       
   164 	case EFsDefaultPath: return _L("EFsDefaultPath");
       
   165 	case EFsSetDefaultPath: return _L("EFsSetDefaultPath");
       
   166 	case EFsSessionPath: return _L("EFsSessionPath");
       
   167 	case EFsSetSessionPath: return _L("EFsSetSessionPath");
       
   168 	case EFsMkDir: return _L("EFsMkDir");
       
   169 	case EFsRmDir: return _L("EFsRmDir");
       
   170 	case EFsParse: return _L("EFsParse");
       
   171 	case EFsDelete: return _L("EFsDelete");
       
   172 	case EFsRename: return _L("EFsRename");
       
   173 	case EFsReplace: return _L("EFsReplace");
       
   174 	case EFsEntry: return _L("EFsEntry");
       
   175 	case EFsSetEntry: return _L("EFsSetEntry");
       
   176 	case EFsGetDriveName: return _L("EFsGetDriveName");
       
   177 	case EFsSetDriveName: return _L("EFsSetDriveName");
       
   178 	case EFsFormatSubClose: return _L("EFsFormatSubClose");
       
   179 	case EFsDirSubClose: return _L("EFsDirSubClose");
       
   180 	case EFsFileSubClose: return _L("EFsFileSubClose");
       
   181 	case EFsRawSubClose: return _L("EFsRawSubClose");
       
   182 	case EFsFileOpen: return _L("EFsFileOpen");
       
   183 	case EFsFileCreate: return _L("EFsFileCreate");
       
   184 	case EFsFileReplace: return _L("EFsFileReplace");
       
   185 	case EFsFileTemp: return _L("EFsFileTemp");
       
   186 	case EFsFileRead: return _L("EFsFileRead");
       
   187 	case EFsFileWrite: return _L("EFsFileWrite");
       
   188 	case EFsFileLock: return _L("EFsFileLock");
       
   189 	case EFsFileUnLock: return _L("EFsFileUnLock");
       
   190 	case EFsFileSeek: return _L("EFsFileSeek");
       
   191 	case EFsFileFlush: return _L("EFsFileFlush");
       
   192 	case EFsFileSize: return _L("EFsFileSize");
       
   193 	case EFsFileSetSize: return _L("EFsFileSetSize");
       
   194 	case EFsFileAtt: return _L("EFsFileAtt");
       
   195 	case EFsFileSetAtt: return _L("EFsFileSetAtt");
       
   196 	case EFsFileModified: return _L("EFsFileModified");
       
   197 	case EFsFileSetModified: return _L("EFsFileSetModified");
       
   198 	case EFsFileSet: return _L("EFsFileSet");
       
   199 	case EFsFileChangeMode: return _L("EFsFileChangeMode");
       
   200 	case EFsFileRename: return _L("EFsFileRename");
       
   201 	case EFsDirOpen: return _L("EFsDirOpen");
       
   202 	case EFsDirReadOne: return _L("EFsDirReadOne");
       
   203 	case EFsDirReadPacked: return _L("EFsDirReadPacked");
       
   204 	case EFsFormatOpen: return _L("EFsFormatOpen");
       
   205 	case EFsFormatNext: return _L("EFsFormatNext");
       
   206 	case EFsRawDiskOpen: return _L("EFsRawDiskOpen");
       
   207 	case EFsRawDiskRead: return _L("EFsRawDiskRead");
       
   208 	case EFsRawDiskWrite: return _L("EFsRawDiskWrite");
       
   209 	case EFsResourceCountMarkStart: return _L("EFsResourceCountMarkStart");
       
   210 	case EFsResourceCountMarkEnd: return _L("EFsResourceCountMarkEnd");
       
   211 	case EFsResourceCount: return _L("EFsResourceCount");
       
   212 	case EFsCheckDisk: return _L("EFsCheckDisk");
       
   213 	case EFsGetShortName: return _L("EFsGetShortName");
       
   214 	case EFsGetLongName: return _L("EFsGetLongName");
       
   215 	case EFsIsFileOpen: return _L("EFsIsFileOpen");
       
   216 	case EFsListOpenFiles: return _L("EFsListOpenFiles");
       
   217 	case EFsSetNotifyUser: return _L("EFsSetNotifyUser");
       
   218 	case EFsIsFileInRom: return _L("EFsIsFileInRom");
       
   219 	case EFsGetNotifyUser: return _L("EFsGetNotifyUser");
       
   220 	case EFsIsValidName: return _L("EFsIsValidName");
       
   221 	case EFsReadFileSection: return _L("EFsReadFileSection");
       
   222 	case EFsNotifyChangeEx: return _L("EFsNotifyChangeEx");
       
   223 	case EFsNotifyChangeCancelEx: return _L("EFsNotifyChangeCancelEx");
       
   224 	case EFsDismountFileSystem: return _L("EFsDismountFileSystem");
       
   225 	case EFsFileSystemName: return _L("EFsFileSystemName");
       
   226 	case EFsScanDrive: return _L("EFsScanDrive");
       
   227 	case EFsControlIo: return _L("EFsControlIo");
       
   228 	case EFsLockDrive: return _L("EFsLockDrive");
       
   229 	case EFsUnlockDrive: return _L("EFsUnlockDrive");
       
   230 	case EFsClearPassword: return _L("EFsClearPassword");
       
   231 	case EFsNotifyDiskSpace: return _L("EFsNotifyDiskSpace");
       
   232 	case EFsNotifyDiskSpaceCancel: return _L("EFsNotifyDiskSpaceCancel");
       
   233 	case EFsMountFileSystemScan: return _L("EFsMountFileSystemScan");
       
   234 	case EFsSessionToPrivate: return _L("EFsSessionToPrivate");
       
   235 	case EFsPrivatePath: return _L("EFsPrivatePath");
       
   236 	case EFsCreatePrivatePath: return _L("EFsCreatePrivatePath");
       
   237 	case EFsFileDrive: return _L("EFsFileDrive");
       
   238 	case EFsRemountDrive: return _L("EFsRemountDrive");
       
   239 	case EFsAddExtension: return _L("EFsAddExtension");
       
   240 	case EFsMountExtension: return _L("EFsMountExtension");
       
   241 	case EFsDismountExtension: return _L("EFsDismountExtension");
       
   242 	case EFsRemoveExtension: return _L("EFsRemoveExtension");
       
   243 	case EFsExtensionName: return _L("EFsExtensionName");
       
   244 	case EFsStartupInitComplete: return _L("EFsStartupInitComplete");
       
   245 	case EFsSetLocalDriveMapping: return _L("EFsSetLocalDriveMapping");
       
   246 	case EFsFileDuplicate: return _L("EFsFileDuplicate");
       
   247 	case EFsFileAdopt: return _L("EFsFileAdopt");
       
   248 	case EFsFinaliseDrive: return _L("EFsFinaliseDrive");
       
   249 	case EFsSwapFileSystem: return _L("EFsSwapFileSystem");
       
   250 	case EFsErasePassword: return _L("EFsErasePassword");
       
   251 	case EFsReserveDriveSpace: return _L("EFsReserveDriveSpace");
       
   252 	case EFsGetReserveAccess: return _L("EFsGetReserveAccess");
       
   253 	case EFsReleaseReserveAccess: return _L("EFsReleaseReserveAccess");
       
   254 	case EFsFileName: return _L("EFsFileName");
       
   255     case EFsGetMediaSerialNumber: return _L("EFsGetMediaSerialNumber");
       
   256 	case EFsFileFullName: return _L("EFsFileFullName");
       
   257 	case EFsAddPlugin: return _L("EFsAddPlugin");
       
   258 	case EFsRemovePlugin: return _L("EFsRemovePlugin");
       
   259 	case EFsMountPlugin: return _L("EFsMountPlugin");
       
   260 	case EFsDismountPlugin: return _L("EFsDismountPlugin");
       
   261 	case EFsPluginName: return _L("EFsPluginName");
       
   262 	case EFsPluginOpen: return _L("EFsPluginOpen");
       
   263 	case EFsPluginSubClose: return _L("EFsPluginSubClose");
       
   264 	case EFsPluginDoRequest: return _L("EFsPluginDoRequest");
       
   265 	case EFsPluginDoControl: return _L("EFsPluginDoControl");
       
   266 	case EFsPluginDoCancel: return _L("EFsPluginDoCancel");
       
   267 	case EFsNotifyDismount: return _L("EFsNotifyDismount");
       
   268 	case EFsNotifyDismountCancel: return _L("EFsNotifyDismountCancel");
       
   269 	case EFsAllowDismount: return _L("EFsAllowDismount");
       
   270 	case EFsSetStartupConfiguration: return _L("EFsSetStartupConfiguration");
       
   271 	case EFsFileReadCancel: return _L("EFsFileReadCancel");
       
   272 	case EFsAddCompositeMount: return _L("EFsAddCompositeMount");
       
   273 	case EFsSetSessionFlags: return _L("EFsSetSessionFlags");
       
   274 	case EFsSetSystemDrive: return _L("EFsSetSystemDrive");
       
   275 	case EFsBlockMap: return _L("EFsBlockMap");
       
   276 	case EFsUnclamp: return _L("EFsUnclamp");
       
   277 	case EFsFileClamp: return _L("EFsFileClamp");
       
   278 	case EFsQueryVolumeInfoExt: return _L("EFsQueryVolumeInfoExt");
       
   279 	case EFsInitialisePropertiesFile: return _L("EFsInitialisePropertiesFile");
       
   280 	case EFsFileWriteDirty: return _L("EFsFileWriteDirty");
       
   281 	case EFsSynchroniseDriveThread: return _L("EFsSynchroniseDriveThread");
       
   282 	case EFsAddProxyDrive: return _L("EFsAddProxyDrive");
       
   283 	case EFsRemoveProxyDrive: return _L("EFsRemoveProxyDrive");
       
   284 	case EFsMountProxyDrive: return _L("EFsMountProxyDrive");
       
   285 	case EFsDismountProxyDrive:  return _L("EFsDismountProxyDrive");
       
   286 	case EFsNotificationAdd : return _L("EFsNotificationAdd"); 
       
   287 	case EFsNotificationBuffer : return _L("EFsNotificationBuffer");
       
   288 	case EFsNotificationCancel : return _L("EFsNotificationCancel");
       
   289 	case EFsNotificationOpen : return _L("EFsNotificationOpen");
       
   290 	case EFsNotificationRemove : return _L("EFsNotificationRemove");
       
   291 	case EFsNotificationRequest : return _L("EFsNotificationRequest");
       
   292 	case EFsNotificationSubClose : return _L("EFsNotificationSubClose");
       
   293 	case EFsLoadCodePage: return _L("EFsLoadCodePage");
       
   294 	default:
       
   295 		return _L("Error unknown function");
       
   296 		}
       
   297 	}
       
   298 
       
   299 
       
   300 void PrintStartUpReason(TMachineStartupType aReason)
       
   301 //
       
   302 // Print the reason the machine is booting up
       
   303 //
       
   304 	{
       
   305 
       
   306 	TBuf<64> nameBuf;
       
   307 	switch (aReason)
       
   308 		{
       
   309 	case EStartupCold: nameBuf=_L("EStartupCold"); break;
       
   310 	case EStartupColdReset: nameBuf=_L("EStartupColdReset"); break;
       
   311 	case EStartupNewOs: nameBuf=_L("EStartupNewOs"); break;
       
   312 	case EStartupPowerFail: nameBuf=_L("StartupPowerFail"); break;
       
   313 	case EStartupWarmReset: nameBuf=_L("EStartupWarmReset"); break;
       
   314 	case EStartupKernelFault: nameBuf=_L("EStartupKernelFault"); break;
       
   315 	case EStartupSafeReset: nameBuf=_L("EStartupSafeReset"); break;
       
   316 	default:
       
   317 		nameBuf=_L("Error unknown startup type");
       
   318 		}
       
   319 	__PRINT1(_L("Machine startup - %S"),&nameBuf);
       
   320 	};
       
   321 
       
   322 LOCAL_C void AllocPrint(TInt aFunction)
       
   323 //
       
   324 // Print number of alloc fails to complete a given function
       
   325 //
       
   326 	{
       
   327 	if (UserHeapAllocFailCount || KernHeapAllocFailCount)
       
   328 		{	
       
   329 		TPtrC funcName=GetFunctionName(aFunction);
       
   330 			{
       
   331 			__PRINTALLOC(_L("Function %S UserAllocs %d KernAllocs %d"),&funcName,UserHeapAllocFailCount,KernHeapAllocFailCount);
       
   332 			}
       
   333 		}
       
   334 	}
       
   335 
       
   336 void SimulateAllocFailure(TInt aFunctionReturnValue,TInt aFunction)
       
   337 //
       
   338 // Simulate alloc failure
       
   339 //
       
   340 	{
       
   341 
       
   342 	
       
   343 	if (UserHeapAllocFailCount>=0 && (aFunctionReturnValue==KErrDiskFull || aFunctionReturnValue==KErrNoMemory))
       
   344 		{
       
   345 		if (KernHeapAllocFailCount<20)
       
   346 			{
       
   347 			__KHEAP_FAILNEXT(++KernHeapAllocFailCount);
       
   348 			__UHEAP_FAILNEXT(UserHeapAllocFailCount);
       
   349 			}
       
   350 		else
       
   351 			{
       
   352 			KernHeapAllocFailCount=0;
       
   353 			__UHEAP_FAILNEXT(++UserHeapAllocFailCount);
       
   354 			__KHEAP_FAILNEXT(KernHeapAllocFailCount);
       
   355 			}
       
   356 		if (UserHeapAllocFailCount<100)
       
   357 			return;
       
   358 		}
       
   359 	if (UserHeapAllocFailCount>=0)
       
   360 		{
       
   361 		AllocPrint(aFunction);
       
   362 		UserHeapAllocFailCount=0;
       
   363 		KernHeapAllocFailCount=0;
       
   364 		__UHEAP_FAILNEXT(UserHeapAllocFailCount);
       
   365 		__KHEAP_FAILNEXT(KernHeapAllocFailCount);
       
   366 		}
       
   367 	}
       
   368 
       
   369 #else
       
   370 TInt FsDebugFunction(CFsRequest* /*aRequest*/)
       
   371 //
       
   372 // Not in the release build
       
   373 //
       
   374 	{
       
   375 	return KErrNotSupported;
       
   376 	}
       
   377 #endif
       
   378 
       
   379 TInt TFsDebugFunc::DoRequestL(CFsRequest* aRequest)
       
   380 //
       
   381 // Not in the release build
       
   382 //
       
   383 	{
       
   384 	return FsDebugFunction(aRequest);
       
   385 	}
       
   386 
       
   387 TInt TFsDebugFunc::Initialise(CFsRequest* /*aRequest*/)
       
   388 //
       
   389 // Not in the release build
       
   390 //
       
   391 	{
       
   392 	return KErrNone;
       
   393 	}
       
   394 
       
   395 TInt TFsControlIo::DoRequestL(CFsRequest* aRequest)
       
   396 //
       
   397 // General purpose test interface - .FSY specific.
       
   398 // Not in the release build
       
   399 //
       
   400 	{
       
   401 	TInt command=aRequest->Message().Int1();
       
   402 	TAny* param1=(TAny*)aRequest->Message().Ptr2();
       
   403 	TAny* param2=(TAny*)aRequest->Message().Ptr3();
       
   404 
       
   405 
       
   406 #if defined(_DEBUG) || defined(_DEBUG_RELEASE)
       
   407 	switch(command)
       
   408 		{	//These are non-drive commands
       
   409 		case KControlIoGetCorruptLogRecord:
       
   410 			{
       
   411 			// number of the log record to be retrieved (1-based)
       
   412 			TInt logRecNum=(TInt)param2;
       
   413 			TFsDebugCorruptLogRecordBuf logBuf;
       
   414 			TInt r=TCorruptLogRec::GetLogRecord(logBuf,logRecNum);
       
   415 			if(r!=KErrNone)
       
   416 				return r;
       
   417 			r=aRequest->Write(2,logBuf,0);
       
   418 			return r;
       
   419 			}
       
   420 		case KControlIoGetNumberOfCorruptLogRecords:
       
   421 			{
       
   422 			TPtrC8 ptrHits((TUint8*)&gNumberOfCorruptHits,sizeof(gNumberOfCorruptHits));
       
   423 			TInt r=aRequest->Write(2,ptrHits,0);
       
   424 
       
   425 			return r;
       
   426 			}
       
   427 		case KControlIoGetCorruptListFile:
       
   428 			{
       
   429 			// Get name of file that contains the filenames nominated as "corrupt"
       
   430 			TBuf8<KMaxFileName> fileName8;
       
   431 			if(gCorruptFileNamesListFile)
       
   432 				{
       
   433 				fileName8.Copy(*gCorruptFileNamesListFile);
       
   434 				}
       
   435 			else
       
   436 				{
       
   437 				fileName8.SetLength(0);
       
   438 				}
       
   439 			TInt r=aRequest->Write(2,fileName8,0);
       
   440 			return r;
       
   441 			}
       
   442 		case KControlIoCorruptLogRecordReset:
       
   443 			{
       
   444 			TCorruptLogRec::DestroyList();
       
   445 			TCorruptNameRec::ResetListConsumed();
       
   446 			return KErrNone;
       
   447 			}
       
   448 		case KControlIoCacheCount:
       
   449 			{
       
   450 			TIOCacheValues cacheValues;
       
   451 			cacheValues.iCloseCount= RequestAllocator::CloseCount();
       
   452 			cacheValues.iFreeCount= RequestAllocator::FreeCount();
       
   453 			cacheValues.iAllocated=	RequestAllocator::AllocatedCount();
       
   454 			cacheValues.iTotalCount= RequestAllocator::TotalCount();
       
   455 			TPckgBuf<TIOCacheValues> pkgBuf(cacheValues);
       
   456 
       
   457 			// ensure we only write what the client buffer can hold -
       
   458 			// this allows TIOCacheValues to increase in size without breaking BC
       
   459 			pkgBuf.SetLength(Min(pkgBuf.MaxLength(), aRequest->Message().GetDesMaxLengthL(2)));
       
   460 			
       
   461 			TInt r=aRequest->Write(2,pkgBuf);
       
   462 			return r;
       
   463 			}
       
   464 		case KControlIoGetLocalDriveNumber:
       
   465 			{
       
   466 			return DriveNumberToLocalDriveNumber(aRequest->Drive()->DriveNumber());
       
   467 			}
       
   468 		case KControlIoCancelDeferredDismount:
       
   469 			{
       
   470 			// Cancel and clear deferred dismount information
       
   471 			aRequest->Drive()->ClearDeferredDismount();
       
   472 			return KErrNone;
       
   473 			}
       
   474 		case KControlIoFileCacheStats:
       
   475 			{
       
   476 			CCacheManager* manager = CCacheManagerFactory::CacheManager();
       
   477 			if (manager == NULL)
       
   478 				return KErrNotSupported;
       
   479 
       
   480 			TFileCacheStats& stats = manager->Stats();
       
   481 
       
   482 			TPckgBuf<TFileCacheStats> pkgBuf(stats);
       
   483 			TInt r=aRequest->Write(2,pkgBuf);
       
   484 			return r;
       
   485 			}
       
   486 		case KControlIoFileCacheConfig:
       
   487 			{
       
   488 			TInt driveNumber = aRequest->Drive()->DriveNumber();
       
   489 
       
   490 			TFileCacheSettings::TFileCacheConfig* driveConfig = NULL;
       
   491 			TInt r = TFileCacheSettings::GetFileCacheConfig(driveNumber, driveConfig);
       
   492 			if (( r != KErrNone) || (driveConfig == NULL))
       
   493 				return KErrNotSupported;
       
   494 
       
   495 			TFileCacheConfig config;
       
   496 			config.iDrive = driveConfig->iDrive;
       
   497 			config.iFlags = driveConfig->iFlags;
       
   498 			config.iFileCacheReadAsync = driveConfig->iFileCacheReadAsync;
       
   499 			config.iFairSchedulingLen = driveConfig->iFairSchedulingLen;
       
   500 			config.iCacheSize = driveConfig->iCacheSize;
       
   501 			config.iMaxReadAheadLen = driveConfig->iMaxReadAheadLen;
       
   502 			config.iClosedFileKeepAliveTime = driveConfig->iClosedFileKeepAliveTime;
       
   503 			config.iDirtyDataFlushTime = driveConfig->iDirtyDataFlushTime;
       
   504 
       
   505 			TPckgBuf<TFileCacheConfig> pkgBuf(config);
       
   506 			r=aRequest->Write(2,pkgBuf);
       
   507 			return r;
       
   508 			}
       
   509 		case KControlIoFileCacheFlagsWrite:
       
   510 			{
       
   511 			TInt drive = aRequest->Message().Int0();
       
   512 
       
   513 			TPckgBuf<TFileCacheFlags> driveFlagsPkg;
       
   514 			TFileCacheFlags& driveFlags = driveFlagsPkg();
       
   515 
       
   516 			TInt r = aRequest->Read(2, driveFlagsPkg);
       
   517 			if (r != KErrNone)
       
   518 				return r;
       
   519 
       
   520 			__CACHE_PRINT2(_L("CACHE: TFileCacheFlags %x on drive %d"), driveFlags, drive);
       
   521 			TFileCacheSettings::SetFlags(drive, driveFlags);
       
   522 
       
   523 			return r;
       
   524 			}
       
   525 		case KControlIoFlushClosedFiles:
       
   526 			{
       
   527 			TClosedFileUtils::Remove();
       
   528 			return KErrNone;
       
   529 			}
       
   530 		case KControlIoSimulateLockFailureMode:
       
   531 			{
       
   532 			TPckgBuf<TBool> enabledPkg;
       
   533 			TInt r = aRequest->Read(2, enabledPkg);
       
   534 			if (r != KErrNone)
       
   535 				return r;
       
   536 
       
   537 			CCacheManager* manager = CCacheManagerFactory::CacheManager();
       
   538 			if (manager == NULL)
       
   539 				return KErrNotSupported;
       
   540 			manager->SimulateLockFailureMode(enabledPkg());
       
   541 			return KErrNone;
       
   542 			}
       
   543 		case KControlIoSimulateFileCacheWriteFailure:
       
   544 			{
       
   545 			CCacheManager* manager = CCacheManagerFactory::CacheManager();
       
   546 			if (manager == NULL)
       
   547 				return KErrNotSupported;
       
   548 			manager->SimulateWriteFailure();
       
   549 			return KErrNone;
       
   550 			}
       
   551 		case KControlIoFileCacheDump:
       
   552 			{
       
   553 			CCacheManager* manager = CCacheManagerFactory::CacheManager();
       
   554 			if (manager == NULL)
       
   555 				return KErrNotSupported;
       
   556 			manager->DumpCache();
       
   557 			return KErrNone;
       
   558 			}
       
   559 		case KControlIoAllocateMaxSegments:
       
   560 			{
       
   561 			TPckgBuf<TBool> enabledPkg;
       
   562 			TInt r = aRequest->Read(2, enabledPkg);
       
   563 			if (r != KErrNone)
       
   564 				return r;
       
   565 
       
   566 			CCacheManager* manager = CCacheManagerFactory::CacheManager();
       
   567 			if (manager == NULL)
       
   568 				return KErrNotSupported;
       
   569 			manager->AllocateMaxSegments(enabledPkg());
       
   570 			return KErrNone;
       
   571 			}
       
   572 		case KControlIoDisableFatUtilityFunctions:
       
   573 			{
       
   574 			EnableFatUtilityFunctions = EFalse;
       
   575 			return KErrNone;
       
   576 			}
       
   577 		case KControlIoEnableFatUtilityFunctions:
       
   578 			{
       
   579 			EnableFatUtilityFunctions = ETrue;
       
   580 			return KErrNone;
       
   581 			}
       
   582 		}
       
   583 #endif
       
   584 
       
   585 	return(aRequest->Drive()->ControlIO(aRequest->Message(),command,param1,param2));
       
   586 	}
       
   587 
       
   588 TInt TFsControlIo::Initialise(CFsRequest* aRequest)
       
   589 //
       
   590 // General purpose test interface - .FSY specific.
       
   591 // Not in the release build
       
   592 //
       
   593 	{
       
   594 	TInt driveNumber=aRequest->Message().Int0();
       
   595 	if(driveNumber<0||driveNumber>=KMaxDrives)
       
   596 		return(KErrArgument);
       
   597 	ValidateDriveDoSubst(driveNumber,aRequest);
       
   598 	return KErrNone;
       
   599 	}
       
   600