Function Ext2OplockRequest

Ext4Fsd/fsctl.c:448–613

 */

NTSTATUS
Ext2OplockRequest (
    IN PEXT2_IRP_CONTEXT IrpContext
)
{
    NTSTATUS    Status;

    ULONG       FsCtrlCode;
    PDEVICE_OBJECT DeviceObject;
    PFILE_OBJECT   FileObject;

    PIRP Irp = NULL;
    PIO_STACK_LOCATION IrpSp;
    PEXTENDED_IO_STACK_LOCATION EIrpSp;

    PEXT2_VCB   Vcb = NULL;
    PEXT2_FCB   Fcb = NULL;
    PEXT2_CCB   Ccb = NULL;

    ULONG OplockCount = 0;

    BOOLEAN VcbResourceAcquired = FALSE;
    BOOLEAN FcbResourceAcquired = FALSE;

    ASSERT(IrpContext);

    __try {

        Irp = IrpContext->Irp;
        ASSERT(Irp);

        IrpSp = IoGetCurrentIrpStackLocation(Irp);
        ASSERT(IrpSp);
        EIrpSp = (PEXTENDED_IO_STACK_LOCATION)IrpSp;

        ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
               (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));

        DeviceObject = IrpContext->DeviceObject;

        //
        // This request is not allowed on the main device object
        //
        if (IsExt2FsDevice(DeviceObject)) {
            Status = STATUS_INVALID_DEVICE_REQUEST;
            __leave;
        }

        Vcb = (PEXT2_VCB) DeviceObject->DeviceExtension;

        ASSERT(Vcb != NULL);

        ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
               (Vcb->Identifier.Size == sizeof(EXT2_VCB)));

        ASSERT(IsMounted(Vcb));

        FileObject = IrpContext->FileObject;