/*++

Copyright (c) 1999 - 2002  Microsoft Corporation

Module Name:

    passThrough.c

Abstract:

    This is the main module of the passThrough miniFilter driver.
    This filter hooks all IO operations for both pre and post operation
    callbacks.  The filter passes through the operations.

Environment:

    Kernel mode

--*/

#include <fltKernel.h>

PFLT_FILTER gFilterHandle;
ULONG_PTR OperationStatusCtx = 1;

#define PTDBG_TRACE_ROUTINES            0x00000001
#define PTDBG_TRACE_OPERATION_STATUS    0x00000002

ULONG gTraceFlags = 0;


#define PT_DBG_PRINT( _dbgLevel, _string )          \
    (FlagOn(gTraceFlags,(_dbgLevel)) ?              \
        DbgPrint _string :                          \
        ((void)0))

/*************************************************************************
    Prototypes
*************************************************************************/

NTSTATUS
DriverEntry (
    IN PDRIVER_OBJECT DriverObject,
    IN PUNICODE_STRING RegistryPath
    );

NTSTATUS
PtInstanceSetup (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_SETUP_FLAGS Flags,
    IN DEVICE_TYPE VolumeDeviceType,
    IN FLT_FILESYSTEM_TYPE VolumeFilesystemType
    );

VOID
PtInstanceTeardownStart (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_TEARDOWN_FLAGS Flags
    );

VOID
PtInstanceTeardownComplete (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_TEARDOWN_FLAGS Flags
    );

NTSTATUS
PtUnload (
    FLT_FILTER_UNLOAD_FLAGS Flags
    );

NTSTATUS
PtInstanceQueryTeardown (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_QUERY_TEARDOWN_FLAGS Flags
    );

FLT_PREOP_CALLBACK_STATUS
PtPreOperationPassThrough (
    IN OUT PFLT_CALLBACK_DATA Data,
    IN PCFLT_RELATED_OBJECTS FltObjects,
    OUT PVOID *CompletionContext
    );

VOID
PtOperationStatusCallback (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN PFLT_IO_PARAMETER_BLOCK ParameterSnapshot,
    IN NTSTATUS OperationStatus,
    IN PVOID RequesterContext
    );

FLT_POSTOP_CALLBACK_STATUS
PtPostOperationPassThrough (
    IN OUT PFLT_CALLBACK_DATA Data,
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN PVOID CompletionContext,
    IN FLT_POST_OPERATION_FLAGS Flags
    );

FLT_PREOP_CALLBACK_STATUS
PtPreOperationNoPostOperationPassThrough (
    IN OUT PFLT_CALLBACK_DATA Data,
    IN PCFLT_RELATED_OBJECTS FltObjects,
    OUT PVOID *CompletionContext
    );

BOOLEAN
PtDoRequestOperationStatus(
    IN PFLT_CALLBACK_DATA Data
    );

//
//  Assign text sections for each routine.
//

#ifdef ALLOC_PRAGMA
#pragma alloc_text(INIT, DriverEntry)
#pragma alloc_text(PAGE, PtUnload)
#pragma alloc_text(PAGE, PtInstanceQueryTeardown)
#pragma alloc_text(PAGE, PtInstanceSetup)
#pragma alloc_text(PAGE, PtInstanceTeardownStart)
#pragma alloc_text(PAGE, PtInstanceTeardownComplete)
#endif

//
//  operation registration
//

CONST FLT_OPERATION_REGISTRATION Callbacks[] = {
    { IRP_MJ_CREATE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_CREATE_NAMED_PIPE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_CLOSE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_READ,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_WRITE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_QUERY_INFORMATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SET_INFORMATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_QUERY_EA,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SET_EA,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_FLUSH_BUFFERS,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_QUERY_VOLUME_INFORMATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SET_VOLUME_INFORMATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_DIRECTORY_CONTROL,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_FILE_SYSTEM_CONTROL,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_DEVICE_CONTROL,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_INTERNAL_DEVICE_CONTROL,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SHUTDOWN,
      0,
      PtPreOperationNoPostOperationPassThrough,
      NULL },                               //post operations not supported

    { IRP_MJ_LOCK_CONTROL,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_CLEANUP,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_CREATE_MAILSLOT,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_QUERY_SECURITY,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SET_SECURITY,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_QUERY_QUOTA,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_SET_QUOTA,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_PNP,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_RELEASE_FOR_SECTION_SYNCHRONIZATION,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_ACQUIRE_FOR_MOD_WRITE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_RELEASE_FOR_MOD_WRITE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_ACQUIRE_FOR_CC_FLUSH,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_RELEASE_FOR_CC_FLUSH,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_NOTIFY_STREAM_FILE_OBJECT,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_FAST_IO_CHECK_IF_POSSIBLE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_NETWORK_QUERY_OPEN,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_MDL_READ,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_MDL_READ_COMPLETE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_PREPARE_MDL_WRITE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_MDL_WRITE_COMPLETE,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_VOLUME_MOUNT,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_VOLUME_DISMOUNT,
      0,
      PtPreOperationPassThrough,
      PtPostOperationPassThrough },

    { IRP_MJ_OPERATION_END }
};

//
//  This defines what we want to filter with FltMgr
//

CONST FLT_REGISTRATION FilterRegistration = {

    sizeof( FLT_REGISTRATION ),         //  Size
    FLT_REGISTRATION_VERSION,           //  Version
    0,                                  //  Flags

    NULL,                               //  Context
    Callbacks,                          //  Operation callbacks

    PtUnload,                           //  MiniFilterUnload

    PtInstanceSetup,                    //  InstanceSetup
    PtInstanceQueryTeardown,            //  InstanceQueryTeardown
    PtInstanceTeardownStart,            //  InstanceTeardownStart
    PtInstanceTeardownComplete,         //  InstanceTeardownComplete

    NULL,                               //  GenerateFileName
    NULL,                               //  GenerateDestinationFileName
    NULL                                //  NormalizeNameComponent

};



NTSTATUS
PtInstanceSetup (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_SETUP_FLAGS Flags,
    IN DEVICE_TYPE VolumeDeviceType,
    IN FLT_FILESYSTEM_TYPE VolumeFilesystemType
    )
/*++

Routine Description:

    This routine is called whenever a new instance is created on a volume. This
    gives us a chance to decide if we need to attach to this volume or not.

    If this routine is not defined in the registration structure, automatic
    instances are alwasys created.

Arguments:

    FltObjects - Pointer to the FLT_RELATED_OBJECTS data structure containing
        opaque handles to this filter, instance and its associated volume.

    Flags - Flags describing the reason for this attach request.

Return Value:

    STATUS_SUCCESS - attach
    STATUS_FLT_DO_NOT_ATTACH - do not attach

--*/
{
    UNREFERENCED_PARAMETER( FltObjects );
    UNREFERENCED_PARAMETER( Flags );
    UNREFERENCED_PARAMETER( VolumeDeviceType );
    UNREFERENCED_PARAMETER( VolumeFilesystemType );

    PT_DBG_PRINT( PTDBG_TRACE_ROUTINES,
                  ("PassThrough!PtInstanceSetup: Entered\n") );

    return STATUS_SUCCESS;
}


NTSTATUS
PtInstanceQueryTeardown (
    IN PCFLT_RELATED_OBJECTS FltObjects,
    IN FLT_INSTANCE_QUERY_TEARDOWN_FLAGS Flags
    )
/*++

Routine Description:

    This is called when an instance is being manually deleted by a
    call to FltDetachVolume or FilterDetach thereby giving us a
    chance to fail that detach request.

    If this routine is not defined in the registration structure, explicit
    detach requests via FltDetachVolume or FilterDetach will always be
    failed.

Arguments:

    FltObjects - Pointer to the FLT_RELATED_OBJECTS data structure containing
        opaque handles to this filter, instance and its associated volume.

    Flags - Indicating where this detach request came from.

Return Value:

    Returns the status of this operation.

--*/
{
    UNREFERENCED_PARAMETER( FltObjects );
    UNREFERENCED_PARAMETER( Flags );

    PT_DBG_PRINT( PTDBG_TRACE_ROUTINES,