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diff --git a/private/inc/smbtrsup.h b/private/inc/smbtrsup.h
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+/*++
+
+Copyright (c) 1990 Microsoft Corporation
+
+Module Name:
+
+    smbtrsup.h
+
+Abstract:
+
+    This module provides the interface to the kernel mode SmbTrace
+    component within the LanMan server and redirector.
+    The interface providing user-level access to SmbTrace is found in
+    nt\private\inc\smbtrace.h
+
+Author:
+
+    Stephan Mueller (t-stephm) 20-July-1992
+
+Revision History:
+
+    20-July-1992 t-stephm
+
+        Created
+
+--*/
+
+#ifndef _SMBTRSUP_
+#define _SMBTRSUP_
+
+//
+// Selection of components in which SmbTrace will run.
+// Pass the appropriate value to SmbTraceStart and SmbTraceStop,
+// and test the appropriate element of SmbTraceActive and
+// SmbTraceTransitioning.  The actual tracing calls do not require
+// a Component parameter as it is implied by the routine being called.
+//
+
+typedef enum _SMBTRACE_COMPONENT {
+    SMBTRACE_SERVER,
+    SMBTRACE_REDIRECTOR
+} SMBTRACE_COMPONENT;
+
+
+extern BOOLEAN SmbTraceActive[];
+
+//
+// SmbTrace support exported routines
+//
+
+
+//
+// Initialize the SMB tracing package
+//
+NTSTATUS
+SmbTraceInitialize (
+    IN SMBTRACE_COMPONENT Component
+    );
+
+//
+// Terminate the SMB tracing package
+//
+VOID
+SmbTraceTerminate (
+    IN SMBTRACE_COMPONENT Component
+    );
+
+//
+// Start tracing
+//
+NTSTATUS
+SmbTraceStart(
+    IN ULONG InputBufferLength,
+    IN ULONG OutputBufferLength,
+    IN OUT PVOID ConfigInOut,
+    IN PFILE_OBJECT FileObject,
+    IN SMBTRACE_COMPONENT Component
+    );
+
+//
+// Stop tracing
+//
+NTSTATUS
+SmbTraceStop(
+    IN PFILE_OBJECT FileObject OPTIONAL,
+    IN SMBTRACE_COMPONENT Component
+    );
+
+
+//
+// VOID
+// SMBTRACE_SRV(
+//     IN PMDL SmbMdl,
+//     )
+//
+// Routine description:
+//
+//     If SmbTrace is turned on, this macro calls SmbTraceCompleteSrv
+//     to send the SMB to the smbtrace program in user mode.  This routine
+//     is specific to the LanMan server.  Use it for tracing an SMB
+//     contained in an Mdl.
+//
+// Arguments:
+//
+//     SmbMdl - a pointer to the Mdl containing the SMB that is about
+//              to be sent.
+//
+// Return Value:
+//
+//     None
+//
+
+#define SMBTRACE_SRV(smbmdl)                                        \
+            if ( SmbTraceActive[SMBTRACE_SERVER] ) {                \
+                SmbTraceCompleteSrv( (smbmdl), NULL, 0 );           \
+            }
+
+//
+// VOID
+// SMBTRACE_SRV2(
+//     IN PVOID Smb,
+//     IN ULONG SmbLength
+//     )
+//
+// Routine description:
+//
+//     If SmbTrace is turned on, this macro calls SmbTraceCompleteSrv
+//     to send the SMB to the smbtrace program in user mode.  This routine
+//     is specific to the LanMan server.  Use it for tracing an SMB
+//     found in contiguous memory.
+//
+// Arguments:
+//
+//     Smb - a pointer to the SMB that is about to be sent.
+//
+//     SmbLength - the length of the SMB.
+//
+// Return Value:
+//
+//     None
+//
+
+#define SMBTRACE_SRV2(smb,smblength)                                \
+            if ( SmbTraceActive[SMBTRACE_SERVER] ) {                \
+                SmbTraceCompleteSrv( NULL, (smb), (smblength) );    \
+            }
+
+//
+// Identify a packet for tracing in the server.
+// Do not call this routine directly, always use the SMBTRACE_SRV macro
+//
+VOID
+SmbTraceCompleteSrv (
+    IN PMDL SmbMdl,
+    IN PVOID Smb,
+    IN CLONG SmbLength
+    );
+
+//
+// VOID
+// SMBTRACE_RDR(
+//     IN PMDL SmbMdl
+//     )
+//
+// Routine description:
+//
+//     If SmbTrace is turned on, this macro calls SmbTraceCompleteRdr
+//     to send the SMB to the smbtrace program in user mode.  This routine
+//     is specific to the LanMan redirector.  Use it for tracing an SMB
+//     contained in an Mdl.
+//
+// Arguments:
+//
+//     SmbMdl - a pointer to the Mdl containing the SMB that is about
+//              to be sent.
+//
+// Return Value:
+//
+//     None
+//
+
+#define SMBTRACE_RDR(smbmdl)                                        \
+            if ( SmbTraceActive[SMBTRACE_REDIRECTOR] ) {            \
+                SmbTraceCompleteRdr( (smbmdl), NULL, 0 );           \
+            }
+
+//
+// VOID
+// SMBTRACE_RDR2(
+//     IN PVOID Smb,
+//     IN ULONG SmbLength
+//     )
+//
+// Routine description:
+//
+//     If SmbTrace is turned on, this macro calls SmbTraceCompleteRdr
+//     to send the SMB to the smbtrace program in user mode.  This routine
+//     is specific to the LanMan redirector.  Use it for tracing an SMB
+//     found in contiguous memory.
+//
+// Arguments:
+//
+//     Smb - a pointer to the SMB that is about to be sent.
+//
+//     SmbLength - the length of the SMB.
+//
+// Return Value:
+//
+//     None
+//
+
+#define SMBTRACE_RDR2(smb,smblength)                                \
+            if ( SmbTraceActive[SMBTRACE_REDIRECTOR] ) {            \
+                SmbTraceCompleteRdr( NULL, (smb), (smblength) );    \
+            }
+
+//
+// Identify a packet for tracing in the redirector.
+// Do not call this routine directly, always use one of the SMBTRACE_RDR
+// macros.
+//
+VOID
+SmbTraceCompleteRdr (
+    IN PMDL SmbMdl,
+    IN PVOID Smb,
+    IN CLONG SmbLength
+    );
+
+#endif  // _SMBTRSUP_
+