fileinfo.c

windows 2000中的UDF文件系统的驱动程序.只有读的功能,不支持未关闭的盘片.只支持UDF2.0以下版本,不支持VAT格式的UDF.

    OUT PIO_STATUS_BLOCK IoStatus,
    IN PDEVICE_OBJECT DeviceObject
    )

/*++

Routine Description:

    This routine is for the fast query call for basic file information.

Arguments:

    FileObject - Supplies the file object used in this operation

    Wait - Indicates if we are allowed to wait for the information

    Buffer - Supplies the output buffer to receive the basic information

    IoStatus - Receives the final status of the operation

Return Value:

    BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
        needs to take the long route.

--*/

{
    BOOLEAN Result = FALSE;
    TYPE_OF_OPEN TypeOfOpen;

    PFCB Fcb;
    PCCB Ccb;

    PAGED_CODE();

    ASSERT_FILE_OBJECT( FileObject );

    FsRtlEnterFileSystem();

    //
    //  Decode the file object to find the type of open and the data
    //  structures.
    //

    TypeOfOpen = UdfDecodeFileObject( FileObject, &Fcb, &Ccb );

    //
    //  We only support this request on user file or directory objects.
    //

    ASSERT( FlagOn( Fcb->FcbState, FCB_STATE_INITIALIZED ));
    
    if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Acquire the file shared to access the Fcb.
    //

    if (!ExAcquireResourceShared( Fcb->Resource, Wait )) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Use a try-finally to facilitate cleanup.
    //

    try {

        //
        //  Only deal with 'good' Fcb's.
        //

        if (UdfVerifyFcbOperation( NULL, Fcb )) {

            //
            //  Fill in the input buffer from the Fcb fields.
            //

            Buffer->CreationTime = Fcb->Timestamps.CreationTime;
            Buffer->LastWriteTime =
            Buffer->ChangeTime =  Fcb->Timestamps.ModificationTime;
            Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;

            Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );

            //
            //  Update the IoStatus block with the size of this data.
            //

            IoStatus->Status = STATUS_SUCCESS;
            IoStatus->Information = sizeof( FILE_BASIC_INFORMATION );

            Result = TRUE;
        }

    } finally {

        ExReleaseResource( Fcb->Resource );

        FsRtlExitFileSystem();
    }

    return Result;
}


BOOLEAN
UdfFastQueryStdInfo (
    IN PFILE_OBJECT FileObject,
    IN BOOLEAN Wait,
    IN OUT PFILE_STANDARD_INFORMATION Buffer,
    OUT PIO_STATUS_BLOCK IoStatus,
    IN PDEVICE_OBJECT DeviceObject
    )

/*++

Routine Description:

    This routine is for the fast query call for standard file information.

Arguments:

    FileObject - Supplies the file object used in this operation

    Wait - Indicates if we are allowed to wait for the information

    Buffer - Supplies the output buffer to receive the basic information

    IoStatus - Receives the final status of the operation

Return Value:

    BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
        needs to take the long route.

--*/

{
    BOOLEAN Result = FALSE;
    TYPE_OF_OPEN TypeOfOpen;

    PFCB Fcb;

    PAGED_CODE();

    ASSERT_FILE_OBJECT( FileObject );

    FsRtlEnterFileSystem();

    //
    //  Decode the file object to find the type of open and the data
    //  structures.
    //

    TypeOfOpen = UdfFastDecodeFileObject( FileObject, &Fcb );

    //
    //  We only support this request on initialized user file or directory objects.
    //

    if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Acquire the file shared to access the Fcb.
    //

    if (!ExAcquireResourceShared( Fcb->Resource, Wait )) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Use a try-finally to facilitate cleanup.
    //

    try {

        //
        //  Only deal with 'good' Fcb's.
        //

        if (UdfVerifyFcbOperation( NULL, Fcb )) {

            //
            //  Check whether this is a directory.
            //

            if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {

                Buffer->AllocationSize.QuadPart =
                Buffer->EndOfFile.QuadPart = 0;

                Buffer->Directory = TRUE;

            } else {

                Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
                Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;

                Buffer->Directory = FALSE;
            }

            Buffer->NumberOfLinks = Fcb->LinkCount;
            Buffer->DeletePending = FALSE;

            //
            //  Update the IoStatus block with the size of this data.
            //

            IoStatus->Status = STATUS_SUCCESS;
            IoStatus->Information = sizeof( FILE_STANDARD_INFORMATION );

            Result = TRUE;
        }

    } finally {

        ExReleaseResource( Fcb->Resource );

        FsRtlExitFileSystem();
    }

    return Result;
}


BOOLEAN
UdfFastQueryNetworkInfo (
    IN PFILE_OBJECT FileObject,
    IN BOOLEAN Wait,
    OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
    OUT PIO_STATUS_BLOCK IoStatus,
    IN PDEVICE_OBJECT DeviceObject
    )

/*++

Routine Description:

    This routine is for the fast query call for network file information.

Arguments:

    FileObject - Supplies the file object used in this operation

    Wait - Indicates if we are allowed to wait for the information

    Buffer - Supplies the output buffer to receive the basic information

    IoStatus - Receives the final status of the operation

Return Value:

    BOOLEAN - TRUE if the operation succeeded and FALSE if the caller
        needs to take the long route.

--*/

{
    BOOLEAN Result = FALSE;
    TYPE_OF_OPEN TypeOfOpen;

    PFCB Fcb;
    PCCB Ccb;

    PAGED_CODE();

    ASSERT_FILE_OBJECT( FileObject );

    FsRtlEnterFileSystem();

    //
    //  Decode the file object to find the type of open and the data
    //  structures.
    //

    TypeOfOpen = UdfDecodeFileObject( FileObject, &Fcb, &Ccb );

    //
    //  We only support this request on user file or directory objects.
    //

    if (TypeOfOpen != UserFileOpen && TypeOfOpen != UserDirectoryOpen) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Acquire the file shared to access the Fcb.
    //

    if (!ExAcquireResourceShared( Fcb->Resource, Wait )) {

        FsRtlExitFileSystem();
        return FALSE;
    }

    //
    //  Use a try-finally to facilitate cleanup.
    //

    try {

        //
        //  Only deal with 'good' Fcb's.
        //

        if (UdfVerifyFcbOperation( NULL, Fcb )) {

            //
            //  Fill in the input buffer from the Fcb fields.
            //

            Buffer->CreationTime = Fcb->Timestamps.CreationTime;
            Buffer->LastWriteTime =
            Buffer->ChangeTime =  Fcb->Timestamps.ModificationTime;
            Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;

            Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );

            //
            //  Check whether this is a directory.
            //

            if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {

                Buffer->AllocationSize.QuadPart =
                Buffer->EndOfFile.QuadPart = 0;

            } else {

                Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
                Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;
            }

            //
            //  Update the IoStatus block with the size of this data.
            //

            IoStatus->Status = STATUS_SUCCESS;
            IoStatus->Information = sizeof( FILE_NETWORK_OPEN_INFORMATION );

            Result = TRUE;
        }

    } finally {

        ExReleaseResource( Fcb->Resource );

        FsRtlExitFileSystem();
    }

    return Result;
}


//
//  Local support routine
//

VOID
UdfQueryBasicInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN PCCB Ccb,
    IN OUT PFILE_BASIC_INFORMATION Buffer,
    IN OUT PULONG Length
    )

/*++

 Description:

    This routine performs the query basic information function for Udfs

Arguments:

    Fcb - Supplies the Fcb being queried, it has been verified
    
    Ccb - Supplies the Ccb associated with the fileobject being queried

    Buffer - Supplies a pointer to the buffer where the information is to
        be returned

    Length - Supplies the length of the buffer in bytes, and receives the
        remaining bytes free in the buffer upon return.

Return Value:

    None

--*/

{
    PAGED_CODE();

    //
    //  We support all times on Udfs.
    //

    Buffer->CreationTime = Fcb->Timestamps.CreationTime;
    Buffer->LastWriteTime =
    Buffer->ChangeTime =  Fcb->Timestamps.ModificationTime;
    Buffer->LastAccessTime = Fcb->Timestamps.AccessTime;

    Buffer->FileAttributes = Fcb->FileAttributes | UdfGetExtraFileAttributes( Ccb );

    //
    //  Update the length and status output variables
    //

    *Length -= sizeof( FILE_BASIC_INFORMATION );

    return;
}


//
//  Local support routine
//

VOID
UdfQueryStandardInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_STANDARD_INFORMATION Buffer,
    IN OUT PULONG Length
    )
/*++

Routine Description:

    This routine performs the query standard information function for Udfs.

Arguments:

    Fcb - Supplies the Fcb being queried, it has been verified

    Buffer - Supplies a pointer to the buffer where the information is to
        be returned

    Length - Supplies the length of the buffer in bytes, and receives the
        remaining bytes free in the buffer upon return.

Return Value:

    None

--*/

{
    PAGED_CODE();

    //
    //  Delete is never pending on a readonly file.
    //

    Buffer->NumberOfLinks = Fcb->LinkCount;
    Buffer->DeletePending = FALSE;

    //
    //  We get the sizes from the header.  Return a size of zero
    //  for all directories.
    //

    if (FlagOn( Fcb->FileAttributes, FILE_ATTRIBUTE_DIRECTORY )) {

        Buffer->AllocationSize.QuadPart =
        Buffer->EndOfFile.QuadPart = 0;

        Buffer->Directory = TRUE;

    } else {

        Buffer->AllocationSize.QuadPart = Fcb->AllocationSize.QuadPart;
        Buffer->EndOfFile.QuadPart = Fcb->FileSize.QuadPart;

        Buffer->Directory = FALSE;
    }

    //
    //  Update the length and status output variables
    //

    *Length -= sizeof( FILE_STANDARD_INFORMATION );