Hello!
I am developing the filter driver of Windows2000.
Please reply to my question.
I made the filter driver for attach to “The File System Driver of NTFS”.
In dispatch of IRP_MJ_WRITE, a path name may be unacquirable from FILEOBJECT.
Please teach a good method.
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Plase see a marking of "".
[conditions]
FSD : NTFS
IRP->Flags : IRP_PAGING_IO bit –> ON
NTSTATUS SFWriteDispatch(
PDEVICE_OBJECT DeviceObject, // Our device object
PIRP Irp) // I/O Request Packet
{
NTSTATUS RC = STATUS_SUCCESS;
PIO_STACK_LOCATION PtrNextIoStackLocation = NULL;
PIO_STACK_LOCATION PtrCurrentStackLocation = NULL;
PtrSFilterDeviceExtension PtrDeviceExtension = NULL;
BOOLEAN AcquiredExtension = FALSE;
BOOLEAN CompleteIrp = FALSE;
PDEVICE_OBJECT PtrTargetDeviceObject = NULL;
ULONG ReturnedInformation = 0;
IO_STATUS_BLOCK Iosb;
try {
PtrCurrentStackLocation = IoGetCurrentIrpStackLocation(Irp);
PtrDeviceExtension = (PtrSFilterDeviceExtension)(DeviceObject->DeviceExtension);
SFilterAssertExtPtrValid(PtrDeviceExtension);
// our target device object.
ExAcquireResourceExclusiveLite(&(PtrDeviceExtension->DeviceExtensionResource), TRUE);
AcquiredExtension = TRUE;
if ((PtrDeviceExtension->NodeIdentifier.NodeType == SFILTER_NODE_TYPE_ATTACHED_DEVICE)
&& (PtrDeviceExtension->DeviceExtensionFlags & SFILTER_DEV_EXT_ATTACHED)){
if( ((Irp->Flags & IRP_PAGING_IO) || (Irp->Flags & IRP_SYNCHRONOUS_PAGING_IO) ) &&
( PtrCurrentStackLocation->Parameters.Write.Length ) ){
if( PtrCurrentStackLocation->FileObject->FileName == NULL ){
//
// This is a problem part!!!
// I want to acquire a file name.
// In this cases, FO_STREAMFILE bit of Flags is “ON”
// I want to acquire a Path name from FileObject, or
// would not use STREAM_FILE$B!*(B
// *******************************
}
}
PtrNextIoStackLocation = IoGetNextIrpStackLocation(Irp);
*PtrNextIoStackLocation = *PtrCurrentStackLocation;
IoSetCompletionRoutine(Irp, SFilterDefaultCompletion, PtrDeviceExtension, TRUE, TRUE, TRUE);
PtrTargetDeviceObject = PtrDeviceExtension->TargetDeviceObject;
SFilterIncrementLargeInteger(PtrDeviceExtension->OutstandingIoRequests,
(unsigned long)1,
&(PtrDeviceExtension->IoRequestsSpinLock));
KeClearEvent(&(PtrDeviceExtension->IoInProgressEvent));
if (AcquiredExtension) {
SFilterReleaseResource(&(PtrDeviceExtension->DeviceExtensionResource));
AcquiredExtension = FALSE;
}
RC = IoCallDriver(PtrTargetDeviceObject, Irp);
try_return(RC);
}
// IoCallDriver()$B<:GT(B
CompleteIrp = TRUE;
try_return(RC = STATUS_INVALID_DEVICE_REQUEST);
try_exit:
NOTHING;
}
finally {
if (AcquiredExtension) {
SFilterReleaseResource(&(PtrDeviceExtension->DeviceExtensionResource));
AcquiredExtension = FALSE;
}
if (CompleteIrp) {
Irp->IoStatus.Status = RC;
Irp->IoStatus.Information = ReturnedInformation;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
}
return(RC);
}
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