private FileCacheElement getFileCacheElement(IoFlow InFlow, string InFileName, byte[] InData, UInt64 InFileOffset, uint copyOffset, uint InDataLength)
{
FileCacheElement elemReturn;
bool reused = false;
lock (this.freeFileCacheElements)
{
if (this.freeFileCacheElements.Count > 0){
LinkedListNode<FileCacheElement> llNode = this.freeFileCacheElements.First;
this.freeFileCacheElements.Remove(llNode);
elemReturn = llNode.Value;
reused=true;
} else {
elemReturn = new FileCacheElement(InFlow, InFileName, InData, InFileOffset, copyOffset, InDataLength);
}
}
if (reused)
{
Debug.Assert(elemReturn.DataLength == InDataLength);
elemReturn.fileName = InFileName;
elemReturn.Flow = InFlow;
// keep data elemReturn.Data = null;
elemReturn.FileOffset = InFileOffset;
elemReturn.DataLength = InDataLength;
elemReturn.Dirty = false;
elemReturn.nodeInList = null;
elemReturn.nodeInDirtyList = null;
if (InData != null)
{
Buffer.BlockCopy(InData, (int)copyOffset, elemReturn.Data, 0, (int)InDataLength);
}
}
return elemReturn;
}
public LinkedListNode<FileCacheElement> nodeInList; // location in LRU linked list
#endregion Fields
#region Constructors
//
// Constructor.
// Copies InData locally
public FileCacheElement(IoFlow InFlow, string InFileName, byte[] InData, UInt64 InFileOffset, uint copyOffset, uint InDataLength)
{
LockObj = new object();
fileName = InFileName;
Flow = InFlow;
Data = null;
FileOffset = InFileOffset;
DataLength = InDataLength;
Dirty = false;
nodeInList = null;
nodeInDirtyList = null;
nodeInFreeFileCacheList = null;
if (InData != null)
{
Data = new byte[InDataLength];
Buffer.BlockCopy(InData, (int)copyOffset, Data, 0, (int)InDataLength);
//Array.Copy(InData, copyOffset, Data, 0, InDataLength);
}
}
/// <summary>
/// Creates an IoFlow structure in runtime and corresponding structures (Flow and RAP)
/// in the driver.
/// </summary>
/// <param name="accountName">A valid NT security account of form EUROPE\gregos.</param>
/// <param name="fileName">A valid file name of form C:\tmp\gregos.txt or \Device\HarddiskVolumen\tmp\gregos.txt</param>
/// <param name="callbackPreCreate">Callback func to invoke for IRPs on PreCreate path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostCreate">Callback func to invoke for IRPs on PostCreate path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreRead">Callback func to invoke for IRPs on PreRead path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostRead">Callback func to invoke for IRPs on PostRead path
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreWrite">Callback func to invoke for IRPs on PreWrite path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostWrite">Callback func to invoke for IRPs on PostWrite path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreCleanup">Callback func to invoke for IRPs on PreCleanup path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostCreate">Callback func to invoke for IRPs on PostCleanup path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="context">Some object reference of your own for additional state associated with thie IoFlow</param>
/// <returns></returns>
public IoFlow CreateFlow(
uint flowId,
string accountName,
string fileName,
CallbackPreCreate callbackPreCreate,
CallbackPostCreate callbackPostCreate,
CallbackPreRead callbackPreRead,
CallbackPostRead callbackPostRead,
CallbackPreWrite callbackPreWrite,
CallbackPostWrite callbackPostWrite,
CallbackPreCleanup callbackPreCleanup,
CallbackPostCleanup callbackPostCleanup,
CallbackPreLockControl callbackPreLockControl,
object context)
{
IoFlow ioFlow = null;
//
// Validate fileName, transforming drive letters to volume names.
//
fileName = fileName.ToLower();
string origFilename = fileName;
if (string.IsNullOrEmpty(fileName) || string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentNullException("fileName");
}
else if (fileName.Length < 2)
{
throw new ArgumentOutOfRangeException("fileName", "too short");
}
else if (fileName.Substring(1, 1).Equals(@":"))
{
string driveName = fileName.Substring(0, 2); // think "C:"
string deviceName = "";
if (DriveNameToVolumeName.TryGetValue(driveName, out deviceName))
{
fileName = deviceName + fileName.Substring(2);
}
}
if (fileName.ToLower().StartsWith(DeviceMup.ToLower()))
{
Debug.Assert(0 == 1); //XXXIS: don't use \device\mup in the paths in the config file
}
else if (fileName.ToLower().StartsWith(RemoteDeviceSlash.ToLower()))
{
fileName = DeviceMup + fileName;
}
else if (fileName.ToLower().StartsWith(RemoteDeviceDoubleSlash.ToLower()))
{
fileName = DeviceMup + fileName.Substring(1);
}
else if (!fileName.ToLower().StartsWith(DeviceHarddiskVolume))
{
throw new ArgumentException(@"must be format e.g. C: or \Device\HarddiskVolume", "fileName");
}
#if gregos // "XXXET: not used, just for testing" crashes on launch due to FileToBlock.dll not found
// for lock drives, test physical offset code
// XXXET: not used, just for testing
if (fileName.Substring(1, 1).Equals(@":") ||
origFilename.ToLower().StartsWith(DeviceHarddiskVolume))
{
if (origFilename.ToLower().StartsWith(DeviceHarddiskVolume))
{
origFilename = getDriveLetterFileName(origFilename);
}
Int64 poffset = FileToBlock.GetPhysicalOffset(origFilename);
Console.WriteLine("File {0} starts in physical offset {1}", origFilename, poffset);
}
#endif
//
// Get SID for the given account name.
//
SecurityIdentifier sid = SidLookup(accountName);
//
// Create IoFlow object.
//
LockIoFlow.EnterWriteLock();
try
{
ioFlow = new IoFlow(flowId, context, accountName, sid, fileName,
callbackPreCreate, callbackPostCreate,
callbackPreRead, callbackPostRead,
callbackPreWrite, callbackPostWrite,
callbackPreCleanup, callbackPostCleanup,
callbackPreLockControl);
DictIoFlow.Add(flowId, ioFlow);
Driver.CreateFlow.Request(hControlPort, TenantId, flowId, ioFlow.Flags);
Driver.CreateRap.Request(hControlPort, TenantId, flowId, accountName, sid, fileName);
}
catch (ExceptionIoFlow)
{
DriverReset();
throw;
}
LockIoFlow.ExitWriteLock();
return(ioFlow);
}
/// <summary>
/// Creates an IoFlow structure in runtime and corresponding structures (Flow and RAP)
/// in the driver.
/// </summary>
/// <param name="accountName">A valid NT security account of form EUROPE\gregos.</param>
/// <param name="fileName">A valid file name of form C:\tmp\gregos.txt or \Device\HarddiskVolumen\tmp\gregos.txt</param>
/// <param name="callbackPreCreate">Callback func to invoke for IRPs on PreCreate path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostCreate">Callback func to invoke for IRPs on PostCreate path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreRead">Callback func to invoke for IRPs on PreRead path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostRead">Callback func to invoke for IRPs on PostRead path
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreWrite">Callback func to invoke for IRPs on PreWrite path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostWrite">Callback func to invoke for IRPs on PostWrite path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="callbackPreCleanup">Callback func to invoke for IRPs on PreCleanup path.
/// Corresponds to an IFS Minifilter PRE_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551109(v=vs.85).aspx</param>
/// <param name="callbackPostCreate">Callback func to invoke for IRPs on PostCleanup path.
/// Corresponds to an IFS Minifilter POST_OPERATION callback ref http://msdn.microsoft.com/en-us/library/windows/hardware/ff551107(v=vs.85).aspx</param>
/// <param name="context">Some object reference of your own for additional state associated with thie IoFlow</param>
/// <returns></returns>
public IoFlow CreateFlow(
uint flowId,
string accountName,
string fileName,
CallbackPreCreate callbackPreCreate,
CallbackPostCreate callbackPostCreate,
CallbackPreRead callbackPreRead,
CallbackPostRead callbackPostRead,
CallbackPreWrite callbackPreWrite,
CallbackPostWrite callbackPostWrite,
CallbackPreCleanup callbackPreCleanup,
CallbackPostCleanup callbackPostCleanup,
CallbackPreLockControl callbackPreLockControl,
object context)
{
IoFlow ioFlow = null;
//
// Validate fileName, transforming drive letters to volume names.
//
fileName = fileName.ToLower();
string origFilename = fileName;
if (string.IsNullOrEmpty(fileName) || string.IsNullOrWhiteSpace(fileName))
throw new ArgumentNullException("fileName");
else if (fileName.Length < 2)
throw new ArgumentOutOfRangeException("fileName", "too short");
else if (fileName.Substring(1, 1).Equals(@":"))
{
string driveName = fileName.Substring(0, 2); // think "C:"
string deviceName = "";
if (DriveNameToVolumeName.TryGetValue(driveName, out deviceName))
fileName = deviceName + fileName.Substring(2);
}
if (fileName.ToLower().StartsWith(DeviceMup.ToLower()))
{
Debug.Assert(0 == 1); //XXXIS: don't use \device\mup in the paths in the config file
}
else if (fileName.ToLower().StartsWith(RemoteDeviceSlash.ToLower()))
{
fileName = DeviceMup + fileName;
}
else if (fileName.ToLower().StartsWith(RemoteDeviceDoubleSlash.ToLower()))
{
fileName = DeviceMup + fileName.Substring(1);
}
else if (!fileName.ToLower().StartsWith(DeviceHarddiskVolume))
throw new ArgumentException(@"must be format e.g. C: or \Device\HarddiskVolume", "fileName");
#if gregos // "XXXET: not used, just for testing" crashes on launch due to FileToBlock.dll not found
// for lock drives, test physical offset code
// XXXET: not used, just for testing
if (fileName.Substring(1, 1).Equals(@":") ||
origFilename.ToLower().StartsWith(DeviceHarddiskVolume))
{
if (origFilename.ToLower().StartsWith(DeviceHarddiskVolume))
{
origFilename = getDriveLetterFileName(origFilename);
}
Int64 poffset = FileToBlock.GetPhysicalOffset(origFilename);
Console.WriteLine("File {0} starts in physical offset {1}", origFilename, poffset);
}
#endif
//
// Get SID for the given account name.
//
SecurityIdentifier sid = SidLookup(accountName);
//
// Create IoFlow object.
//
LockIoFlow.EnterWriteLock();
try
{
ioFlow = new IoFlow(flowId, context, accountName, sid, fileName,
callbackPreCreate, callbackPostCreate,
callbackPreRead, callbackPostRead,
callbackPreWrite, callbackPostWrite,
callbackPreCleanup, callbackPostCleanup,
callbackPreLockControl);
DictIoFlow.Add(flowId, ioFlow);
Driver.CreateFlow.Request(hControlPort, TenantId, flowId, ioFlow.Flags);
Driver.CreateRap.Request(hControlPort, TenantId, flowId, accountName, sid, fileName);
}
catch (ExceptionIoFlow)
{
DriverReset();
throw;
}
LockIoFlow.ExitWriteLock();
return ioFlow;
}
private void parseControllerCommandString(IoFlow flow, string controllerCommand)
{
string[] commandStringSeparators = new string[] { " ", "\t" };
char[] tokenSeparator = new char[] { '=' };
string[] commandTokens = controllerCommand.Split(commandStringSeparators, StringSplitOptions.RemoveEmptyEntries);
if (commandTokens.Length > 0)
{
Console.WriteLine("CallbackMessageIoFlowUpdate({0},{1})", flow.FlowId, controllerCommand);
foreach (string token in commandTokens)
{
string param = token.Split(tokenSeparator)[0];
string value = token.Split(tokenSeparator)[1];
//Switch to the appropriate handler
switch (param)
{
case "changeCacheSize":
this.cache.CacheSetFlowSize(flow.FlowId, Convert.ToUInt64(value));
break;
case "changeWritePolicy":
switch (value)
{
case "write-through":
this.cache.SetCacheWritePolicy(CacheWritePolicy.WriteThrough);
break;
default:
Console.WriteLine("Command value invalid");
Debug.Assert(0 == 1);
break;
}
break;
case "changeOpPolicy":
string op = value.Split(',')[0];
string policy = value.Split(',')[1];
switch (op)
{
case "W":
switch (policy)
{
case "yes":
this.cache.SetCacheWriteBuffering(CacheWriteBuffer.Cache); //Cache writes
break;
case "no":
this.cache.SetCacheWriteBuffering(CacheWriteBuffer.noCache); //Don't cache writes
break;
default:
Console.WriteLine("Command value invalid");
Debug.Assert(0 == 1);
break;
}
break;
case "R":
//Nothing for now; add fine-grained control to cache/not cache reads here
break;
default:
Console.WriteLine("Command value invalid");
Debug.Assert(0 == 1);
break;
}
break;
default:
Console.WriteLine("Controller command invalid");
Debug.Assert(0 == 1);
break;
}
}
}
}