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diff --git a/src/H5FDsubfiling/H5FDioc.h b/src/H5FDsubfiling/H5FDioc.h
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+++ b/src/H5FDsubfiling/H5FDioc.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.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:	The public header file for the "io concentrator" driver.
+ * This provides a similar functionality to that of the subfiling driver
+ * but introduces the necessary file access functionality via a multi-
+ * threading MPI service
+ */
+
+#ifndef H5FDioc_H
+#define H5FDioc_H
+
+#ifdef H5_HAVE_IOC_VFD
+#define H5FD_IOC (H5FDperform_init(H5FD_ioc_init))
+#else
+#define H5FD_IOC (H5I_INVALID_HID)
+#endif
+
+#define H5FD_IOC_NAME "ioc"
+
+#ifdef H5_HAVE_IOC_VFD
+
+#ifndef H5FD_IOC_FAPL_MAGIC
+#define H5FD_CURR_IOC_FAPL_VERSION 1
+#define H5FD_IOC_FAPL_MAGIC        0xFED21331
+#endif
+
+#define H5FD_IOC_THREAD_POOL_SIZE 4
+
+/*
+ * Environment variables interpreted by the IOC VFD
+ */
+#define H5_IOC_THREAD_POOL_COUNT "H5_IOC_THREAD_POOL_COUNT"
+
+/*
+ * Define the various constants to allow different allocations
+ * of subfile ranks.  The choices are self explanatory, starting
+ * with the default of one IO Concentrator (IOC) per node and
+ * lastly, defining a fixed number.
+ */
+typedef enum {
+    SELECT_IOC_ONE_PER_NODE = 0, /* Default */
+    SELECT_IOC_EVERY_NTH_RANK,   /* Starting at rank 0, select-next += N */
+    SELECT_IOC_WITH_CONFIG,      /* NOT IMPLEMENTED: Read-from-file       */
+    SELECT_IOC_TOTAL,            /* Starting at rank 0, mpi_size / total   */
+    ioc_selection_options        /* (Uses same selection as every Nth rank) */
+} ioc_selection_t;
+
+/*
+ * In addition to the common configuration fields, we can have
+ * VFD specific fields.  Here's one for the IO Concentrator VFD.
+ *
+ * thread_pool_count (int32_t)
+ *      Indicate the number of helper threads that we want for
+ *      creating a thread pool
+ *
+ * ----------------------------------------------------------------------------
+ */
+
+typedef struct H5FD_ioc_config_t {
+    uint32_t        magic;         /* set to H5FD_IOC_FAPL_MAGIC */
+    uint32_t        version;       /* set to H5FD_CURR_IOC_FAPL_VERSION */
+    int32_t         stripe_count;  /* How many io concentrators */
+    int64_t         stripe_depth;  /* Max # of bytes in contiguous IO to an IOC */
+    ioc_selection_t ioc_selection; /* Method to select IO Concentrators */
+    hid_t           ioc_fapl_id;   /* The hid_t value of the stacked VFD  */
+    int32_t         thread_pool_count;
+} H5FD_ioc_config_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+H5_DLL hid_t  H5FD_ioc_init(void);
+H5_DLL herr_t H5Pset_fapl_ioc(hid_t fapl_id, H5FD_ioc_config_t *config_ptr);
+H5_DLL herr_t H5Pget_fapl_ioc(hid_t fapl_id, H5FD_ioc_config_t *config_ptr);
+H5_DLL void   begin_thread_exclusive(void);
+H5_DLL void   end_thread_exclusive(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* H5_HAVE_IOC_VFD */
+
+#endif