//+---------------------------------------------------------------------------- // // Copyright (C) 1992, Microsoft Corporation. // // File: dfsinit.c // // Contents: This module implements the DRIVER_INITIALIZATION routine // for the Dfs file system driver. // // Functions: DfsDriverEntry - Main entry point for driver initialization // DfsIoTimerRoutine - Main entry point for scavenger thread // DfsDeleteDevices - Routine to scavenge deleted net uses // //----------------------------------------------------------------------------- #include "dfsprocs.h" #include "fastio.h" #include "fcbsup.h" // // The following are includes for init modules, which will get discarded when // the driver has finished loading. // #include "provider.h" // // The debug trace level // #define Dbg (DEBUG_TRACE_INIT) VOID DfsIoTimerRoutine( IN PDEVICE_OBJECT DeviceObject, IN PVOID Context ); VOID DfsDeleteDevices( PDFS_TIMER_CONTEXT DfsTimerContext); #ifdef ALLOC_PRAGMA #pragma alloc_text(PAGE, DfsDriverEntry) #pragma alloc_text(PAGE, DfsDeleteDevices) // // The following routine should not be pageable, because it gets called by // the NT timer routine frequently. We don't want to thrash. // // DfsIoTimerRoutine // #endif // ALLOC_PRAGMA // // This macro takes a pointer (or ulong) and returns its rounded up quadword // value // #define QuadAlign(Ptr) ( \ ((((ULONG)(Ptr)) + 7) & 0xfffffff8) \ ) //+------------------------------------------------------------------- // // Function: DfsDriverEntry, main entry point // // Synopsis: This is the initialization routine for the Dfs file system // device driver. This routine creates the device object for // the FileSystem device and performs all other driver // initialization. // // Arguments: [DriverObject] -- Pointer to driver object created by the // system. // [RegistryPath] -- Path to section in registry describing // this driver's configuration. // // Returns: [NTSTATUS] - The function value is the final status from // the initialization operation. // //-------------------------------------------------------------------- NTSTATUS DfsDriverEntry( IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath ) { NTSTATUS Status; UNICODE_STRING UnicodeString; PDEVICE_OBJECT DeviceObject; OBJECT_ATTRIBUTES ObjectAttributes; PWSTR p; int i; HANDLE hTemp; HANDLE DirHandle; IO_STATUS_BLOCK iosb; // // See if someone else has already created a File System Device object // with the name we intend to use. If so, we bail. // RtlInitUnicodeString( &UnicodeString, DFS_DRIVER_NAME ); InitializeObjectAttributes( &ObjectAttributes, &UnicodeString, OBJ_CASE_INSENSITIVE, 0, NULL); Status = ZwCreateFile( &hTemp, SYNCHRONIZE, &ObjectAttributes, &iosb, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_READ | FILE_SHARE_WRITE, FILE_OPEN, 0, NULL, 0); if (NT_SUCCESS(Status)) { ZwClose( hTemp ); DfsDbgTrace(0, Dbg, "Dfs driver already loaded!\n", 0); return( STATUS_UNSUCCESSFUL ); } // // Create the filesystem device object. // Status = IoCreateDevice( DriverObject, 0, &UnicodeString, FILE_DEVICE_DFS_FILE_SYSTEM, FILE_REMOTE_DEVICE, FALSE, &DeviceObject ); if ( !NT_SUCCESS( Status ) ) { return Status; } // // Create a permanent object directory in which the logical root // device objects will reside. Make the directory temporary, so // we can just close the handle to make it go away. // UnicodeString.Buffer = p = LogicalRootDevPath; UnicodeString.Length = 0; UnicodeString.MaximumLength = MAX_LOGICAL_ROOT_LEN; while (*p++ != UNICODE_NULL) UnicodeString.Length += sizeof (WCHAR); InitializeObjectAttributes( &ObjectAttributes, &UnicodeString, OBJ_PERMANENT, NULL, NULL ); Status = ZwCreateDirectoryObject( &DirHandle, DIRECTORY_ALL_ACCESS, &ObjectAttributes); if ( !NT_SUCCESS( Status ) ) { return Status; } ZwMakeTemporaryObject(DirHandle); p[-1] = UNICODE_PATH_SEP; UnicodeString.Length += sizeof (WCHAR); // // Initialize the driver object with this driver's entry points. // Most are simply passed through to some other device driver. // for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; i++) { DriverObject->MajorFunction[i] = DfsVolumePassThrough; } DriverObject->MajorFunction[IRP_MJ_CREATE] = (PDRIVER_DISPATCH)DfsFsdCreate; DriverObject->MajorFunction[IRP_MJ_CLOSE] = (PDRIVER_DISPATCH)DfsFsdClose; DriverObject->MajorFunction[IRP_MJ_CLEANUP] = (PDRIVER_DISPATCH)DfsFsdCleanup; DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] = (PDRIVER_DISPATCH)DfsFsdQueryInformation; DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] = (PDRIVER_DISPATCH)DfsFsdSetInformation; DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] = (PDRIVER_DISPATCH)DfsFsdFileSystemControl; DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION]= (PDRIVER_DISPATCH)DfsFsdQueryVolumeInformation; DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION]= (PDRIVER_DISPATCH)DfsFsdSetVolumeInformation; DriverObject->FastIoDispatch = &FastIoDispatch; // // Initialize the global data structures // RtlZeroMemory(&DfsData, sizeof (DFS_DATA)); DfsData.NodeTypeCode = DSFS_NTC_DATA_HEADER; DfsData.NodeByteSize = sizeof( DFS_DATA ); InitializeListHead( &DfsData.VcbQueue ); InitializeListHead( &DfsData.DeletedVcbQueue ); InitializeListHead( &DfsData.Credentials ); InitializeListHead( &DfsData.DeletedCredentials ); DfsData.DriverObject = DriverObject; DfsData.FileSysDeviceObject = DeviceObject; DfsData.LogRootDevName = UnicodeString; ExInitializeResource( &DfsData.Resource ); KeInitializeEvent( &DfsData.PktWritePending, NotificationEvent, TRUE ); KeInitializeSemaphore( &DfsData.PktReferralRequests, 1, 1 ); DfsData.MachineState = DFS_CLIENT; // // Allocate Provider structures. // DfsData.pProvider = ExAllocatePool( PagedPool, sizeof ( PROVIDER_DEF ) * MAX_PROVIDERS); for (i = 0; i < MAX_PROVIDERS; i++) { DfsData.pProvider[i].NodeTypeCode = DSFS_NTC_PROVIDER; DfsData.pProvider[i].NodeByteSize = sizeof ( PROVIDER_DEF ); } DfsData.cProvider = 0; DfsData.maxProvider = MAX_PROVIDERS; // // Initialize the system wide PKT // PktInitialize(&DfsData.Pkt); { ULONG SystemSizeMultiplier; ULONG ZoneSegmentSize; switch (MmQuerySystemSize()) { default: case MmSmallSystem: SystemSizeMultiplier = 4; break; case MmMediumSystem: SystemSizeMultiplier = 8; break; case MmLargeSystem: SystemSizeMultiplier = 16; break; } // // Allocate the DFS_FCB hash table structure. The number of hash buckets // will depend upon the memory size of the system. // Status = DfsInitFcbs(SystemSizeMultiplier * 2); // // Now initialize the zone structures for allocating IRP context // records. The size of the zone will depend upon the memory // available in the system. // KeInitializeSpinLock( &DfsData.IrpContextSpinLock ); ZoneSegmentSize = (SystemSizeMultiplier * QuadAlign(sizeof(IRP_CONTEXT))) + sizeof(ZONE_SEGMENT_HEADER); (VOID) ExInitializeZone( &DfsData.IrpContextZone, QuadAlign(sizeof(IRP_CONTEXT)), FsRtlAllocatePool( NonPagedPool, ZoneSegmentSize ), ZoneSegmentSize ); } // // Set up global pointer to the system process. // DfsData.OurProcess = PsGetCurrentProcess(); // // Register the file system with the I/O system // IoRegisterFileSystem( DeviceObject ); // // Initialize the provider definitions from the registry. // if (!NT_SUCCESS( ProviderInit() )) { DfsDbgTrace(0,DEBUG_TRACE_ERROR, "Could not initialize some or all providers!\n", 0); } // // Initialize the logical roots device objects. These are what form the // link between the outside world and the Dfs driver. // Status = DfsInitializeLogicalRoot( DD_DFS_DEVICE_NAME, NULL, NULL, 0); if (!NT_SUCCESS(Status)) { DfsDbgTrace(-1, DEBUG_TRACE_ERROR, "Failed creation of root logical root %08lx\n", Status); return(Status); } // // Let us start off the Timer Routine. // RtlZeroMemory(&DfsTimerContext, sizeof(DFS_TIMER_CONTEXT)); DfsTimerContext.InUse = FALSE; DfsTimerContext.TickCount = 0; IoInitializeTimer(DeviceObject, DfsIoTimerRoutine, &DfsTimerContext); DfsDbgTrace(0, Dbg, "Initialized the Timer routine\n", 0); // // Let us start the timer now. // IoStartTimer(DeviceObject); return STATUS_SUCCESS; } //+---------------------------------------------------------------------------- // // Function: DfsDeleteDevices // // Synopsis: Routine to scavenge deleted devices (net uses). // // Arguments: [pDfsTimerContext] -- Timer Context // // Returns: Nothing - this routine is meant to be queued to a worker // thread. // //----------------------------------------------------------------------------- VOID DfsDeleteDevices( PDFS_TIMER_CONTEXT DfsTimerContext) { PLIST_ENTRY plink; PDFS_VCB Vcb; PLOGICAL_ROOT_DEVICE_OBJECT DeletedObject; if (DfsData.DeletedVcbQueue.Flink != &DfsData.DeletedVcbQueue) { DfsDbgTrace(0, Dbg, "Examining Deleted Vcbs...\n", 0); ExAcquireResourceExclusive(&DfsData.Resource, TRUE); for (plink = DfsData.DeletedVcbQueue.Flink; plink != &DfsData.DeletedVcbQueue; NOTHING) { Vcb = CONTAINING_RECORD( plink, DFS_VCB, VcbLinks); plink = plink->Flink; DeletedObject = CONTAINING_RECORD( Vcb, LOGICAL_ROOT_DEVICE_OBJECT, Vcb); if (Vcb->OpenFileCount == 0 && Vcb->DirectAccessOpenCount == 0 && DeletedObject->DeviceObject.ReferenceCount == 0) { DfsDbgTrace(0, Dbg, "Deleting Vcb@%08lx\n", Vcb); if (Vcb->LogRootPrefix.Buffer != NULL) ExFreePool(Vcb->LogRootPrefix.Buffer); if (Vcb->LogicalRoot.Buffer != NULL) ExFreePool(Vcb->LogicalRoot.Buffer); RemoveEntryList(&Vcb->VcbLinks); ObDereferenceObject((PVOID) DeletedObject); IoDeleteDevice( &DeletedObject->DeviceObject ); } else { DfsDbgTrace(0, Dbg, "Not deleting Vcb@%08lx\n", Vcb); DfsDbgTrace(0, Dbg, "OpenFileCount = %d\n", Vcb->OpenFileCount); DfsDbgTrace(0, Dbg, "DirectAccessOpens = %d\n", Vcb->DirectAccessOpenCount); DfsDbgTrace(0, Dbg, "DeviceObject Reference count = %d\n", DeletedObject->DeviceObject.ReferenceCount); } } ExReleaseResource(&DfsData.Resource); } DfsTimerContext->InUse = FALSE; } //+------------------------------------------------------------------------- // // Function: DfsIoTimerRoutine // // Synopsis: This function gets called by IO Subsystem once every second. // This can be used for various purposes in the driver. For now, // it periodically posts a request to a system thread to age Pkt // Entries. // // Arguments: [Context] -- This is the context information. It is actually // a pointer to a DFS_TIMER_CONTEXT. // [DeviceObject] -- Pointer to the Device object for DFS. We dont // really use this here. // // Returns: Nothing // // Notes: The Context which we get here is assumed to have all the // required fields setup properly. // // History: 04/24/93 SudK Created. // //-------------------------------------------------------------------------- VOID DfsIoTimerRoutine( IN PDEVICE_OBJECT DeviceObject, IN PVOID Context ) { PDFS_TIMER_CONTEXT pDfsTimerContext = (PDFS_TIMER_CONTEXT) Context; DfsDbgTrace(+1, Dbg, "DfsIoTimerRoutine: Entered\n", 0); // // If the DfsTimerContext is in USE then we just return blindly. Due to // this action we might actually lose some ticks. But then we really are // not very particular about this and hence dont care. // if (pDfsTimerContext->InUse == TRUE) { DfsDbgTrace(-1, Dbg, "DfsIoTimerRoutine: TimerContext in use\n", 0); return; } // // First let us increment the count in the DFS_TIMER_CONTEXT. If it has // reached a bound value then we have to go ahead and schedule the // necessary work items. // pDfsTimerContext->TickCount++; if (pDfsTimerContext->TickCount == DFS_MAX_TICKS) { DfsDbgTrace(0, Dbg, "Queuing Pkt Entry Scavenger\n", 0); pDfsTimerContext->InUse = TRUE; ExInitializeWorkItem( &pDfsTimerContext->WorkQueueItem, DfsAgePktEntries, pDfsTimerContext); ExQueueWorkItem( &pDfsTimerContext->WorkQueueItem, DelayedWorkQueue); } else if (DfsData.DeletedVcbQueue.Flink != &DfsData.DeletedVcbQueue) { DfsDbgTrace(0, Dbg, "Queueing Deleted Vcb Scavenger\n", 0); pDfsTimerContext->InUse = TRUE; ExInitializeWorkItem( &pDfsTimerContext->DeleteQueueItem, DfsDeleteDevices, pDfsTimerContext); ExQueueWorkItem(&pDfsTimerContext->DeleteQueueItem, DelayedWorkQueue); } DfsDbgTrace(-1, Dbg, "DfsIoTimerRoutine: Exiting\n", 0); }