fileinfo.c

winddk src目录下的文件系统驱动源码压缩!

/*++

Copyright (c) 1989-2000 Microsoft Corporation

Module Name:

    FileInfo.c

Abstract:

    This module implements the File Information routines for Cdfs called by
    the Fsd/Fsp dispatch drivers.


--*/

#include "CdProcs.h"

//
//  The Bug check file id for this module
//

#define BugCheckFileId                   (CDFS_BUG_CHECK_FILEINFO)

//
//  Local support routines
//

VOID
CdQueryBasicInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_BASIC_INFORMATION Buffer,
    IN OUT PULONG Length
    );

VOID
CdQueryStandardInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_STANDARD_INFORMATION Buffer,
    IN OUT PULONG Length
    );

VOID
CdQueryInternalInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_INTERNAL_INFORMATION Buffer,
    IN OUT PULONG Length
    );

VOID
CdQueryEaInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_EA_INFORMATION Buffer,
    IN OUT PULONG Length
    );

VOID
CdQueryPositionInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFILE_OBJECT FileObject,
    IN OUT PFILE_POSITION_INFORMATION Buffer,
    IN OUT PULONG Length
    );

NTSTATUS
CdQueryNameInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFILE_OBJECT FileObject,
    IN OUT PFILE_NAME_INFORMATION Buffer,
    IN OUT PULONG Length
    );

NTSTATUS
CdQueryAlternateNameInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN PCCB Ccb,
    IN OUT PFILE_NAME_INFORMATION Buffer,
    IN OUT PULONG Length
    );

VOID
CdQueryNetworkInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PFCB Fcb,
    IN OUT PFILE_NETWORK_OPEN_INFORMATION Buffer,
    IN OUT PULONG Length
    );

#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, CdCommonQueryInfo)
#pragma alloc_text(PAGE, CdCommonSetInfo)
#pragma alloc_text(PAGE, CdFastQueryBasicInfo)
#pragma alloc_text(PAGE, CdFastQueryStdInfo)
#pragma alloc_text(PAGE, CdFastQueryNetworkInfo)
#pragma alloc_text(PAGE, CdQueryAlternateNameInfo)
#pragma alloc_text(PAGE, CdQueryBasicInfo)
#pragma alloc_text(PAGE, CdQueryEaInfo)
#pragma alloc_text(PAGE, CdQueryInternalInfo)
#pragma alloc_text(PAGE, CdQueryNameInfo)
#pragma alloc_text(PAGE, CdQueryNetworkInfo)
#pragma alloc_text(PAGE, CdQueryPositionInfo)
#pragma alloc_text(PAGE, CdQueryStandardInfo)
#endif


NTSTATUS
CdCommonQueryInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PIRP Irp
    )

/*++

Routine Description:

    This is the common routine for query file information called by both the
    fsd and fsp threads.

Arguments:

    Irp - Supplies the Irp to process.

Return Value:

    NTSTATUS - The return status for this operation.

--*/

{
    NTSTATUS Status = STATUS_SUCCESS;
    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );

    ULONG Length;
    FILE_INFORMATION_CLASS FileInformationClass;
    PFILE_ALL_INFORMATION Buffer;

    TYPE_OF_OPEN TypeOfOpen;
    PFCB Fcb;
    PCCB Ccb;

    BOOLEAN ReleaseFcb = FALSE;

    PAGED_CODE();

    //
    //  Reference our input parameters to make things easier
    //

    Length = IrpSp->Parameters.QueryFile.Length;
    FileInformationClass = IrpSp->Parameters.QueryFile.FileInformationClass;
    Buffer = Irp->AssociatedIrp.SystemBuffer;

    //
    //  Decode the file object
    //

    TypeOfOpen = CdDecodeFileObject( IrpContext, IrpSp->FileObject, &Fcb, &Ccb );

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

    try {

        //
        //  We only support query on file and directory handles.
        //

        switch (TypeOfOpen) {

        case UserDirectoryOpen :
        case UserFileOpen :

            //
            //  Acquire shared access to this file.  NOTE that this could be
            //  a recursive acquire,  if we already preacquired in
            //  CdAcquireForCreateSection().
            //

            CdAcquireFileShared( IrpContext, Fcb );
            ReleaseFcb = TRUE;

            //
            //  Make sure we have the correct sizes for a directory.
            //

            if (!FlagOn( Fcb->FcbState, FCB_STATE_INITIALIZED )) {

                ASSERT( TypeOfOpen == UserDirectoryOpen );
                CdVerifyOrCreateDirStreamFile( IrpContext, Fcb);
            }

            //
            //  Make sure the Fcb is in a usable condition.  This will raise
            //  an error condition if the volume is unusable
            //

            CdVerifyFcbOperation( IrpContext, Fcb );

            //
            //  Based on the information class we'll do different
            //  actions.  Each of hte procedures that we're calling fills
            //  up the output buffer, if possible.  They will raise the
            //  status STATUS_BUFFER_OVERFLOW for an insufficient buffer.
            //  This is considered a somewhat unusual case and is handled
            //  more cleanly with the exception mechanism rather than
            //  testing a return status value for each call.
            //

            switch (FileInformationClass) {

            case FileAllInformation:

                //
                //  We don't allow this operation on a file opened by file Id.
                //

                if (FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {

                    Status = STATUS_INVALID_PARAMETER;
                    break;
                }

                //
                //  In this case go ahead and call the individual routines to
                //  fill in the buffer.  Only the name routine will
                //  pointer to the output buffer and then call the
                //  individual routines to fill in the buffer.
                //

                Length -= (sizeof( FILE_ACCESS_INFORMATION ) +
                           sizeof( FILE_MODE_INFORMATION ) +
                           sizeof( FILE_ALIGNMENT_INFORMATION ));

                CdQueryBasicInfo( IrpContext, Fcb, &Buffer->BasicInformation, &Length );
                CdQueryStandardInfo( IrpContext, Fcb, &Buffer->StandardInformation, &Length );
                CdQueryInternalInfo( IrpContext, Fcb, &Buffer->InternalInformation, &Length );
                CdQueryEaInfo( IrpContext, Fcb, &Buffer->EaInformation, &Length );
                CdQueryPositionInfo( IrpContext, IrpSp->FileObject, &Buffer->PositionInformation, &Length );
                Status = CdQueryNameInfo( IrpContext, IrpSp->FileObject, &Buffer->NameInformation, &Length );

                break;

            case FileBasicInformation:

                CdQueryBasicInfo( IrpContext, Fcb, (PFILE_BASIC_INFORMATION) Buffer, &Length );
                break;

            case FileStandardInformation:

                CdQueryStandardInfo( IrpContext, Fcb, (PFILE_STANDARD_INFORMATION) Buffer, &Length );
                break;

            case FileInternalInformation:

                CdQueryInternalInfo( IrpContext, Fcb, (PFILE_INTERNAL_INFORMATION) Buffer, &Length );
                break;

            case FileEaInformation:

                CdQueryEaInfo( IrpContext, Fcb, (PFILE_EA_INFORMATION) Buffer, &Length );
                break;

            case FilePositionInformation:

                CdQueryPositionInfo( IrpContext, IrpSp->FileObject, (PFILE_POSITION_INFORMATION) Buffer, &Length );
                break;

            case FileNameInformation:

                //
                //  We don't allow this operation on a file opened by file Id.
                //

                if (!FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {

                    Status = CdQueryNameInfo( IrpContext, IrpSp->FileObject, (PFILE_NAME_INFORMATION) Buffer, &Length );

                } else {

                    Status = STATUS_INVALID_PARAMETER;
                }

                break;

            case FileAlternateNameInformation:

                if (!FlagOn( Ccb->Flags, CCB_FLAG_OPEN_BY_ID )) {

                    Status = CdQueryAlternateNameInfo( IrpContext, Fcb, Ccb, (PFILE_NAME_INFORMATION) Buffer, &Length );

                } else {

                    Status = STATUS_INVALID_PARAMETER;
                }

                break;

            case FileNetworkOpenInformation:

                CdQueryNetworkInfo( IrpContext, Fcb, (PFILE_NETWORK_OPEN_INFORMATION) Buffer, &Length );
                break;

            default :

                Status = STATUS_INVALID_PARAMETER;
            }

            break;

        default :

            Status = STATUS_INVALID_PARAMETER;
        }

        //
        //  Set the information field to the number of bytes actually filled in
        //  and then complete the request
        //

        Irp->IoStatus.Information = IrpSp->Parameters.QueryFile.Length - Length;

    } finally {

        //
        //  Release the file.
        //

        if (ReleaseFcb) {

            CdReleaseFile( IrpContext, Fcb );
        }
    }

    //
    //  Complete the request if we didn't raise.
    //

    CdCompleteRequest( IrpContext, Irp, Status );

    return Status;
}


NTSTATUS
CdCommonSetInfo (
    IN PIRP_CONTEXT IrpContext,
    IN PIRP Irp
    )

/*++

Routine Description:

    This is the common routine for set file information called by both the
    fsd and fsp threads.  We only support operations which set the file position.

Arguments:

    Irp - Supplies the Irp to process.

Return Value:

    NTSTATUS - The return status for this operation.

--*/

{
    NTSTATUS Status = STATUS_INVALID_PARAMETER;

    TYPE_OF_OPEN TypeOfOpen;
    PFCB Fcb;
    PCCB Ccb;

    PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );

    PFILE_POSITION_INFORMATION Buffer;

    PAGED_CODE();

    //
    //  Decode the file object
    //

    TypeOfOpen = CdDecodeFileObject( IrpContext, IrpSp->FileObject, &Fcb, &Ccb );

    //
    //  We only support a SetPositionInformation on a user file.
    //

    if ((TypeOfOpen != UserFileOpen) ||
        (IrpSp->Parameters.QueryFile.FileInformationClass != FilePositionInformation)) {

        CdCompleteRequest( IrpContext, Irp, Status );
        return Status;
    }

    //
    //  Acquire shared access to this file.
    //

    CdAcquireFileShared( IrpContext, Fcb );

    try {

        //
        //  Make sure the Fcb is in a usable condition.  This
        //  will raise an error condition if the fcb is unusable
        //

        CdVerifyFcbOperation( IrpContext, Fcb );

        Buffer = Irp->AssociatedIrp.SystemBuffer;

        //
        //  Check if the file does not use intermediate buffering.  If it
        //  does not use intermediate buffering then the new position we're
        //  supplied must be aligned properly for the device
        //

        if (FlagOn( IrpSp->FileObject->Flags, FO_NO_INTERMEDIATE_BUFFERING ) &&
            ((Buffer->CurrentByteOffset.LowPart & Fcb->Vcb->BlockMask) != 0)) {

            try_return( NOTHING );
        }

        //
        //  The input parameter is fine so set the current byte offset and
        //  complete the request
        //

        //
        //  Lock the Fcb to provide synchronization.
        //

        CdLockFcb( IrpContext, Fcb );
        IrpSp->FileObject->CurrentByteOffset = Buffer->CurrentByteOffset;
        CdUnlockFcb( IrpContext, Fcb );

        Status = STATUS_SUCCESS;

    try_exit: NOTHING;
    } finally {

        CdReleaseFile( IrpContext, Fcb );
    }

    //
    //  Complete the request if there was no raise.
    //

    CdCompleteRequest( IrpContext, Irp, Status );
    return Status;
}


BOOLEAN
CdFastQueryBasicInfo (
    IN PFILE_OBJECT FileObject,
    IN BOOLEAN Wait,
    IN OUT PFILE_BASIC_INFORMATION Buffer,
    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;