370 lines
9.3 KiB
C
370 lines
9.3 KiB
C
/*++
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Copyright (c) 1989-2000 Microsoft Corporation
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Module Name:
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CdInit.c
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Abstract:
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This module implements the DRIVER_INITIALIZATION routine for Cdfs
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// @@BEGIN_DDKSPLIT
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Author:
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Brian Andrew [BrianAn] 01-July-1995
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Revision History:
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// @@END_DDKSPLIT
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--*/
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#include "CdProcs.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (CDFS_BUG_CHECK_CDINIT)
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NTSTATUS
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DriverEntry(
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IN PDRIVER_OBJECT DriverObject,
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IN PUNICODE_STRING RegistryPath
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);
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VOID
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CdUnload(
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IN PDRIVER_OBJECT DriverObject
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);
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NTSTATUS
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CdInitializeGlobalData (
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IN PDRIVER_OBJECT DriverObject,
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IN PDEVICE_OBJECT FileSystemDeviceObject
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);
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NTSTATUS
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CdShutdown (
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT, DriverEntry)
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#pragma alloc_text(PAGE, CdUnload)
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#pragma alloc_text(PAGE, CdShutdown)
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#pragma alloc_text(INIT, CdInitializeGlobalData)
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#endif
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//
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// Local support routine
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//
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NTSTATUS
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DriverEntry(
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IN PDRIVER_OBJECT DriverObject,
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IN PUNICODE_STRING RegistryPath
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)
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/*++
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Routine Description:
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This is the initialization routine for the Cdrom file system
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device driver. This routine creates the device object for the FileSystem
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device and performs all other driver initialization.
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Arguments:
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DriverObject - Pointer to driver object created by the system.
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Return Value:
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NTSTATUS - The function value is the final status from the initialization
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operation.
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--*/
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{
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NTSTATUS Status;
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UNICODE_STRING UnicodeString;
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PDEVICE_OBJECT CdfsFileSystemDeviceObject;
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//
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// Create the device object.
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//
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RtlInitUnicodeString( &UnicodeString, L"\\Cdfs" );
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Status = IoCreateDevice( DriverObject,
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0,
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&UnicodeString,
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FILE_DEVICE_CD_ROM_FILE_SYSTEM,
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0,
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FALSE,
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&CdfsFileSystemDeviceObject );
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if (!NT_SUCCESS( Status )) {
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return Status;
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}
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DriverObject->DriverUnload = CdUnload;
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//
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// Note that because of the way data caching is done, we set neither
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// the Direct I/O or Buffered I/O bit in DeviceObject->Flags. If
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// data is not in the cache, or the request is not buffered, we may,
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// set up for Direct I/O by hand.
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//
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//
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// Initialize the driver object with this driver's entry points.
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//
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// NOTE - Each entry in the dispatch table must have an entry in
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// the Fsp/Fsd dispatch switch statements.
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//
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DriverObject->MajorFunction[IRP_MJ_CREATE] =
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DriverObject->MajorFunction[IRP_MJ_CLOSE] =
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DriverObject->MajorFunction[IRP_MJ_READ] =
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DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] =
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DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION] =
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DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION]=
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DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL] =
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DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL] =
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DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] =
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DriverObject->MajorFunction[IRP_MJ_LOCK_CONTROL] =
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DriverObject->MajorFunction[IRP_MJ_CLEANUP] =
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DriverObject->MajorFunction[IRP_MJ_PNP] = (PDRIVER_DISPATCH) CdFsdDispatch;
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DriverObject->MajorFunction[IRP_MJ_SHUTDOWN] = CdShutdown;
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DriverObject->FastIoDispatch = &CdFastIoDispatch;
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Status = IoRegisterShutdownNotification (CdfsFileSystemDeviceObject);
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if (!NT_SUCCESS (Status)) {
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IoDeleteDevice (CdfsFileSystemDeviceObject);
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return Status;
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}
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//
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// Initialize the global data structures
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//
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Status = CdInitializeGlobalData( DriverObject, CdfsFileSystemDeviceObject );
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if (!NT_SUCCESS (Status)) {
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IoDeleteDevice (CdfsFileSystemDeviceObject);
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return Status;
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}
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//
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// Register the file system as low priority with the I/O system. This will cause
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// CDFS to receive mount requests after a) other filesystems currently registered
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// and b) other normal priority filesystems that may be registered later.
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//
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CdfsFileSystemDeviceObject->Flags |= DO_LOW_PRIORITY_FILESYSTEM;
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IoRegisterFileSystem( CdfsFileSystemDeviceObject );
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ObReferenceObject (CdfsFileSystemDeviceObject);
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//
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// And return to our caller
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//
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return( STATUS_SUCCESS );
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}
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NTSTATUS
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CdShutdown (
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine is the shutdown handler for CDFS.
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Arguments:
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DeviceObject - Supplies the registered device object for CDFS.
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Irp - Shutdown IRP
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Return Value:
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None.
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--*/
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{
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IoUnregisterFileSystem (DeviceObject);
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IoDeleteDevice (CdData.FileSystemDeviceObject);
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CdCompleteRequest( NULL, Irp, STATUS_SUCCESS );
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return STATUS_SUCCESS;
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}
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VOID
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CdUnload(
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IN PDRIVER_OBJECT DriverObject
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)
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/*++
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Routine Description:
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This routine unload routine for CDFS.
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Arguments:
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DriverObject - Supplies the driver object for CDFS.
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Return Value:
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None.
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--*/
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{
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PIRP_CONTEXT IrpContext;
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//
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// Free any IRP contexts
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//
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while (1) {
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IrpContext = (PIRP_CONTEXT) PopEntryList( &CdData.IrpContextList) ;
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if (IrpContext == NULL) {
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break;
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}
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ExFreePool (IrpContext);
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}
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IoFreeWorkItem (CdData.CloseItem);
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ExDeleteResourceLite( &CdData.DataResource );
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ObDereferenceObject (CdData.FileSystemDeviceObject);
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}
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//
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// Local support routine
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//
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NTSTATUS
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CdInitializeGlobalData (
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IN PDRIVER_OBJECT DriverObject,
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IN PDEVICE_OBJECT FileSystemDeviceObject
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)
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/*++
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Routine Description:
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This routine initializes the global cdfs data structures.
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Arguments:
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DriverObject - Supplies the driver object for CDFS.
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FileSystemDeviceObject - Supplies the device object for CDFS.
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Return Value:
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None.
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--*/
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{
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//
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// Start by initializing the FastIoDispatch Table.
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//
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RtlZeroMemory( &CdFastIoDispatch, sizeof( FAST_IO_DISPATCH ));
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CdFastIoDispatch.SizeOfFastIoDispatch = sizeof(FAST_IO_DISPATCH);
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CdFastIoDispatch.FastIoCheckIfPossible = CdFastIoCheckIfPossible; // CheckForFastIo
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CdFastIoDispatch.FastIoRead = FsRtlCopyRead; // Read
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CdFastIoDispatch.FastIoQueryBasicInfo = CdFastQueryBasicInfo; // QueryBasicInfo
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CdFastIoDispatch.FastIoQueryStandardInfo = CdFastQueryStdInfo; // QueryStandardInfo
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CdFastIoDispatch.FastIoLock = CdFastLock; // Lock
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CdFastIoDispatch.FastIoUnlockSingle = CdFastUnlockSingle; // UnlockSingle
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CdFastIoDispatch.FastIoUnlockAll = CdFastUnlockAll; // UnlockAll
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CdFastIoDispatch.FastIoUnlockAllByKey = CdFastUnlockAllByKey; // UnlockAllByKey
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CdFastIoDispatch.AcquireFileForNtCreateSection = CdAcquireForCreateSection;
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CdFastIoDispatch.ReleaseFileForNtCreateSection = CdReleaseForCreateSection;
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CdFastIoDispatch.FastIoQueryNetworkOpenInfo = CdFastQueryNetworkInfo; // QueryNetworkInfo
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//
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// Initialize the CdData structure.
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//
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RtlZeroMemory( &CdData, sizeof( CD_DATA ));
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CdData.NodeTypeCode = CDFS_NTC_DATA_HEADER;
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CdData.NodeByteSize = sizeof( CD_DATA );
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CdData.DriverObject = DriverObject;
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CdData.FileSystemDeviceObject = FileSystemDeviceObject;
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InitializeListHead( &CdData.VcbQueue );
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ExInitializeResourceLite( &CdData.DataResource );
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//
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// Initialize the cache manager callback routines
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//
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CdData.CacheManagerCallbacks.AcquireForLazyWrite = &CdAcquireForCache;
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CdData.CacheManagerCallbacks.ReleaseFromLazyWrite = &CdReleaseFromCache;
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CdData.CacheManagerCallbacks.AcquireForReadAhead = &CdAcquireForCache;
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CdData.CacheManagerCallbacks.ReleaseFromReadAhead = &CdReleaseFromCache;
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CdData.CacheManagerVolumeCallbacks.AcquireForLazyWrite = &CdNoopAcquire;
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CdData.CacheManagerVolumeCallbacks.ReleaseFromLazyWrite = &CdNoopRelease;
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CdData.CacheManagerVolumeCallbacks.AcquireForReadAhead = &CdNoopAcquire;
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CdData.CacheManagerVolumeCallbacks.ReleaseFromReadAhead = &CdNoopRelease;
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//
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// Initialize the lock mutex and the async and delay close queues.
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//
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ExInitializeFastMutex( &CdData.CdDataMutex );
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InitializeListHead( &CdData.AsyncCloseQueue );
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InitializeListHead( &CdData.DelayedCloseQueue );
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CdData.CloseItem = IoAllocateWorkItem (FileSystemDeviceObject);
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if (CdData.CloseItem == NULL) {
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ExDeleteResourceLite( &CdData.DataResource );
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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//
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// Do the initialization based on the system size.
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//
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switch (MmQuerySystemSize()) {
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case MmSmallSystem:
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CdData.IrpContextMaxDepth = 4;
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CdData.MaxDelayedCloseCount = 8;
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CdData.MinDelayedCloseCount = 2;
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break;
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case MmMediumSystem:
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CdData.IrpContextMaxDepth = 8;
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CdData.MaxDelayedCloseCount = 24;
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CdData.MinDelayedCloseCount = 6;
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break;
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case MmLargeSystem:
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CdData.IrpContextMaxDepth = 32;
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CdData.MaxDelayedCloseCount = 72;
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CdData.MinDelayedCloseCount = 18;
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break;
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}
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return STATUS_SUCCESS;
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}
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