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diff --git a/src/H5FDsubfiling/H5FDsubfiling_priv.h b/src/H5FDsubfiling/H5FDsubfiling_priv.h
new file mode 100644
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+++ b/src/H5FDsubfiling/H5FDsubfiling_priv.h
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Private definitions for HDF5 Subfiling VFD
+ */
+
+#ifndef H5FDsubfiling_priv_H
+#define H5FDsubfiling_priv_H
+
+/********************/
+/* Standard Headers */
+/********************/
+
+#include <stdatomic.h>
+#include <libgen.h>
+
+/**************/
+/* H5 Headers */
+/**************/
+
+#include "H5private.h"     /* Generic Functions                        */
+#include "H5CXprivate.h"   /* API Contexts                             */
+#include "H5Dprivate.h"    /* Datasets                                 */
+#include "H5Eprivate.h"    /* Error handling                           */
+#include "H5FDsubfiling.h" /* Subfiling VFD                            */
+#include "H5FDioc.h"       /* IOC VFD                                  */
+#include "H5Iprivate.h"    /* IDs                                      */
+#include "H5MMprivate.h"   /* Memory management                        */
+#include "H5Pprivate.h"    /* Property lists                           */
+
+#include "H5subfiling_common.h"
+#include "H5subfiling_err.h"
+
+/*
+ * Some definitions for debugging the Subfiling VFD
+ */
+/* #define H5FD_SUBFILING_DEBUG */
+
+#define DRIVER_INFO_MESSAGE_MAX_INFO   65536
+#define DRIVER_INFO_MESSAGE_MAX_LENGTH 65552 /* MAX_INFO + sizeof(info_header_t) */
+
+typedef struct _info_header { /* Header for a driver info message */
+    uint8_t version;
+    uint8_t unused_1;
+    uint8_t unused_2;
+    uint8_t unused_3;    /* Actual info message length, but  */
+    int32_t info_length; /* CANNOT exceed 64k (65552) bytes  */
+    char    vfd_key[8];  /* 's' 'u' 'b' 'f' 'i' 'l' 'i' 'n'  */
+} info_header_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+H5_DLL herr_t H5FD__subfiling__truncate_sub_files(hid_t context_id, int64_t logical_file_eof, MPI_Comm comm);
+H5_DLL herr_t H5FD__subfiling__get_real_eof(hid_t context_id, int64_t *logical_eof_ptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* H5FDsubfiling_priv_H */