Split VOL connector routines into separate headers:

* H5VLconnector.h for terminal connector things
* H5VLconnector_passthru.h for passthrough connector things

Note that these headers are arranged such that they are included in
hdf5.h so VOL connectors only need to include that. The separation into
multiple headers is mainly for readability.

8 files changed, 620 insertions, 481 deletions

diff --git a/MANIFEST b/MANIFEST
index c3dc0e9..8d98f0a 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -899,6 +899,8 @@
 ./src/H5TSprivate.h
 ./src/H5VL.c
 ./src/H5VLcallback.c
+./src/H5VLconnector.h
+./src/H5VLconnector_passthru.h
 ./src/H5VLint.c
 ./src/H5VLmodule.h
 ./src/H5VLnative.c
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9730436..fbaba34 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -640,6 +640,8 @@ set (H5VL_SOURCES
     ${HDF5_SRC_DIR}/H5VLpassthru.c
 )
 set (H5VL_HDRS
+    ${HDF5_SRC_DIR}/H5VLconnector.h
+    ${HDF5_SRC_DIR}/H5VLconnector_passthru.h
     ${HDF5_SRC_DIR}/H5VLnative.h
     ${HDF5_SRC_DIR}/H5VLpassthru.h
     ${HDF5_SRC_DIR}/H5VLpublic.h
diff --git a/src/H5VLconnector.h b/src/H5VLconnector.h
new file mode 100644
index 0000000..9b01ca2
--- /dev/null
+++ b/src/H5VLconnector.h
@@ -0,0 +1,503 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * This file contains public declarations for authoring VOL connectors.
+ */
+
+#ifndef _H5VLconnector_H
+#define _H5VLconnector_H
+
+/* Public headers needed by this file */
+#include "H5public.h"           /* Generic Functions                    */
+#include "H5Apublic.h"          /* Attributes                           */
+#include "H5ESpublic.h"         /* Event Stack                          */
+#include "H5Fpublic.h"          /* Files                                */
+#include "H5Ipublic.h"          /* IDs                                  */
+#include "H5Lpublic.h"          /* Links                                */
+#include "H5Opublic.h"          /* Objects                              */
+#include "H5Rpublic.h"          /* References                           */
+#include "H5VLpublic.h"         /* Virtual Object Layer                 */
+
+
+/*****************/
+/* Public Macros */
+/*****************/
+
+/* Capability flags for connector */
+#define H5VL_CAP_FLAG_NONE              0       /* No special connector capabilities */
+#define H5VL_CAP_FLAG_THREADSAFE        0x01    /* Connector is threadsafe */
+
+
+/*******************/
+/* Public Typedefs */
+/*******************/
+
+/* types for attribute GET callback */
+typedef enum H5VL_attr_get_t {
+    H5VL_ATTR_GET_ACPL,                     /* creation property list              */
+    H5VL_ATTR_GET_INFO,                     /* info                                */
+    H5VL_ATTR_GET_NAME,                     /* access property list                */
+    H5VL_ATTR_GET_SPACE,                    /* dataspace                           */
+    H5VL_ATTR_GET_STORAGE_SIZE,             /* storage size                        */
+    H5VL_ATTR_GET_TYPE                      /* datatype                            */
+} H5VL_attr_get_t;
+
+/* types for attribute SPECFIC callback */
+typedef enum H5VL_attr_specific_t {
+    H5VL_ATTR_DELETE,                       /* H5Adelete(_by_name/idx)             */
+    H5VL_ATTR_EXISTS,                       /* H5Aexists(_by_name)                 */
+    H5VL_ATTR_ITER,                         /* H5Aiterate(_by_name)                */
+    H5VL_ATTR_RENAME                        /* H5Arename(_by_name)                 */
+} H5VL_attr_specific_t;
+
+/* types for dataset GET callback */
+typedef enum H5VL_dataset_get_t {
+    H5VL_DATASET_GET_DAPL,                  /* access property list                */
+    H5VL_DATASET_GET_DCPL,                  /* creation property list              */
+    H5VL_DATASET_GET_OFFSET,                /* offset                              */
+    H5VL_DATASET_GET_SPACE,                 /* dataspace                           */
+    H5VL_DATASET_GET_SPACE_STATUS,          /* space  status                       */
+    H5VL_DATASET_GET_STORAGE_SIZE,          /* storage size                        */
+    H5VL_DATASET_GET_TYPE                   /* datatype                            */
+} H5VL_dataset_get_t;
+
+/* types for dataset SPECFIC callback */
+typedef enum H5VL_dataset_specific_t {
+    H5VL_DATASET_SET_EXTENT,                /* H5Dset_extent                       */
+    H5VL_DATASET_FLUSH,                     /* H5Dflush                            */
+    H5VL_DATASET_REFRESH                    /* H5Drefresh                          */
+} H5VL_dataset_specific_t;
+
+/* types for datatype GET callback */
+typedef enum H5VL_datatype_get_t {
+    H5VL_DATATYPE_GET_BINARY,               /* get serialized form of transient type    */
+    H5VL_DATATYPE_GET_TCPL                  /* datatype creation property list          */
+} H5VL_datatype_get_t;
+
+/* types for datatype SPECFIC callback */
+typedef enum H5VL_datatype_specific_t {
+    H5VL_DATATYPE_FLUSH,
+    H5VL_DATATYPE_REFRESH
+} H5VL_datatype_specific_t;
+
+/* types for file GET callback */
+typedef enum H5VL_file_get_t {
+    H5VL_FILE_GET_FAPL,                     /* file access property list            */
+    H5VL_FILE_GET_FCPL,                     /* file creation property list          */
+    H5VL_FILE_GET_INTENT,                   /* file intent                          */
+    H5VL_FILE_GET_FILENO,                   /* file number                          */
+    H5VL_FILE_GET_NAME,                     /* file name                            */
+    H5VL_FILE_GET_OBJ_COUNT,                /* object count in file                 */
+    H5VL_FILE_GET_OBJ_IDS                   /* object ids in file                   */
+} H5VL_file_get_t;
+
+/* types for file SPECIFIC callback */
+typedef enum H5VL_file_specific_t {
+    H5VL_FILE_FLUSH,                        /* Flush file                       */
+    H5VL_FILE_REOPEN,                       /* Reopen the file                  */
+    H5VL_FILE_MOUNT,                        /* Mount a file                     */
+    H5VL_FILE_UNMOUNT,                      /* Unmount a file                   */
+    H5VL_FILE_IS_ACCESSIBLE                 /* Check if a file is accessible    */
+} H5VL_file_specific_t;
+
+/* types for group GET callback */
+typedef enum H5VL_group_get_t {
+    H5VL_GROUP_GET_GCPL,                    /* group creation property list     */
+    H5VL_GROUP_GET_INFO                     /* group info                       */
+} H5VL_group_get_t;
+
+/* types for group SPECFIC callback */
+typedef enum H5VL_group_specific_t {
+    H5VL_GROUP_FLUSH,
+    H5VL_GROUP_REFRESH
+} H5VL_group_specific_t;
+
+/* link create types for VOL */
+typedef enum H5VL_link_create_type_t {
+    H5VL_LINK_CREATE_HARD,
+    H5VL_LINK_CREATE_SOFT,
+    H5VL_LINK_CREATE_UD
+} H5VL_link_create_type_t;
+
+/* types for link GET callback */
+typedef enum H5VL_link_get_t {
+    H5VL_LINK_GET_INFO,        /* link info                         */
+    H5VL_LINK_GET_NAME,        /* link name                         */
+    H5VL_LINK_GET_VAL          /* link value                        */
+} H5VL_link_get_t;
+
+/* types for link SPECIFIC callback */
+typedef enum H5VL_link_specific_t {
+    H5VL_LINK_DELETE,          /* H5Ldelete(_by_idx)                */
+    H5VL_LINK_EXISTS,          /* link existence                    */
+    H5VL_LINK_ITER             /* H5Literate/visit(_by_name)              */
+} H5VL_link_specific_t;
+
+/* types for object GET callback */
+typedef enum H5VL_object_get_t {
+    H5VL_REF_GET_NAME,                 /* object name, for reference        */
+    H5VL_REF_GET_REGION,               /* dataspace of region               */
+    H5VL_REF_GET_TYPE,                 /* type of object                    */
+    H5VL_OBJECT_GET_NAME               /* object name                       */
+} H5VL_object_get_t;
+
+/* types for object SPECIFIC callback */
+typedef enum H5VL_object_specific_t {
+    H5VL_OBJECT_CHANGE_REF_COUNT,       /* H5Oincr/decr_refcount             */
+    H5VL_OBJECT_EXISTS,                 /* H5Oexists_by_name                 */
+    H5VL_OBJECT_VISIT,                  /* H5Ovisit(_by_name)                */
+    H5VL_REF_CREATE,                    /* H5Rcreate                         */
+    H5VL_OBJECT_FLUSH,                  /* H5{D|G|O|T}flush                  */
+    H5VL_OBJECT_REFRESH                 /* H5{D|G|O|T}refresh                */
+} H5VL_object_specific_t;
+
+/* types for async request SPECIFIC callback */
+typedef enum H5VL_request_specific_t {
+    H5VL_REQUEST_WAITANY,               /* Wait until any request completes */
+    H5VL_REQUEST_WAITSOME,              /* Wait until at least one requesst completes */
+    H5VL_REQUEST_WAITALL                /* Wait until all requests complete */
+} H5VL_request_specific_t;
+
+/* types for different ways that objects are located in an HDF5 container */
+typedef enum H5VL_loc_type_t {
+    H5VL_OBJECT_BY_SELF,
+    H5VL_OBJECT_BY_NAME,
+    H5VL_OBJECT_BY_IDX,
+    H5VL_OBJECT_BY_ADDR,
+    H5VL_OBJECT_BY_REF
+} H5VL_loc_type_t;
+
+struct H5VL_loc_by_name {
+    const char *name;
+    hid_t lapl_id;
+};
+
+struct H5VL_loc_by_idx {
+    const char *name;
+    H5_index_t idx_type;
+    H5_iter_order_t order;
+    hsize_t n;
+    hid_t lapl_id;
+};
+
+struct H5VL_loc_by_addr {
+    haddr_t addr;
+};
+
+struct H5VL_loc_by_ref {
+    H5R_type_t ref_type;
+    const void *_ref;
+    hid_t lapl_id;
+};
+
+/* Structure to hold parameters for object locations. 
+ * either: BY_ADDR, BY_ID, BY_NAME, BY_IDX, BY_REF
+ *
+ * Note: Leave loc_by_addr as the first union member so we
+ *       can perform the simplest initialization of the struct
+ *       without raising warnings.
+ */
+typedef struct H5VL_loc_params_t {
+    H5I_type_t      obj_type;
+    H5VL_loc_type_t type;
+    union{
+        struct H5VL_loc_by_addr loc_by_addr;
+        struct H5VL_loc_by_name loc_by_name;
+        struct H5VL_loc_by_idx  loc_by_idx;
+        struct H5VL_loc_by_ref  loc_by_ref;
+    } loc_data;
+} H5VL_loc_params_t;
+
+/* VOL connector info fields & callbacks */
+typedef struct H5VL_info_class_t {
+    size_t size;                                    /* Size of the VOL info                         */
+    void * (*copy)(const void *info);               /* Callback to create a copy of the VOL info    */
+    herr_t (*cmp)(int *cmp_value, const void *info1, const void *info2); /* Callback to compare VOL info */
+    herr_t (*free)(void *info);                     /* Callback to release a VOL info               */
+    herr_t (*to_str)(const void *info, char **str); /* Callback to serialize connector's info into a string */
+    herr_t (*from_str)(const char *str, void **info); /* Callback to deserialize a string into connector's info */
+} H5VL_info_class_t;
+
+/* VOL object wrap / retrieval callbacks */
+/* (These only need to be implemented by "pass through" VOL connectors) */
+typedef struct H5VL_wrap_class_t {
+    void * (*get_object)(const void *obj);          /* Callback to retrieve underlying object       */
+    herr_t (*get_wrap_ctx)(const void *obj, void **wrap_ctx); /* Callback to retrieve the object wrapping context for the connector */
+    void * (*wrap_object)(void *obj, H5I_type_t obj_type, void *wrap_ctx); /* Callback to wrap a library object */
+    void * (*unwrap_object)(void *obj);             /* Callback to unwrap a library object */
+    herr_t (*free_wrap_ctx)(void *wrap_ctx);        /* Callback to release the object wrapping context for the connector */
+} H5VL_wrap_class_t;
+
+/* H5A routines */
+typedef struct H5VL_attr_class_t {
+    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
+            hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id,
+            hid_t dxpl_id, void **req);
+    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
+                  hid_t aapl_id, hid_t dxpl_id, void **req);
+    herr_t (*read)(void *attr, hid_t mem_type_id, void *buf, hid_t dxpl_id, void **req);
+    herr_t (*write)(void *attr, hid_t mem_type_id, const void *buf, hid_t dxpl_id, void **req);
+    herr_t (*get)(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*close) (void *attr, hid_t dxpl_id, void **req);
+} H5VL_attr_class_t;
+
+/* H5D routines */
+typedef struct H5VL_dataset_class_t {
+    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+            hid_t lcpl_id, hid_t type_id, hid_t space_id, hid_t dcpl_id,
+            hid_t dapl_id, hid_t dxpl_id, void **req);
+    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+                  hid_t dapl_id, hid_t dxpl_id, void **req);
+    herr_t (*read)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
+                   hid_t xfer_plist_id, void * buf, void **req);
+    herr_t (*write)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
+                    hid_t xfer_plist_id, const void * buf, void **req);
+    herr_t (*get)(void *obj, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, H5VL_dataset_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*close) (void *dset, hid_t dxpl_id, void **req);
+} H5VL_dataset_class_t;
+
+/* H5T routines*/
+typedef struct H5VL_datatype_class_t {
+    void *(*commit)(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t type_id,
+                    hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
+    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char * name,
+                  hid_t tapl_id, hid_t dxpl_id, void **req);
+    herr_t (*get)   (void *obj, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, H5VL_datatype_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*close) (void *dt, hid_t dxpl_id, void **req);
+} H5VL_datatype_class_t;
+
+/* H5F routines */
+typedef struct H5VL_file_class_t {
+    void *(*create)(const char *name, unsigned flags, hid_t fcpl_id,
+                    hid_t fapl_id, hid_t dxpl_id, void **req);
+    void *(*open)(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
+    herr_t (*get)(void *obj, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, H5VL_file_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*close) (void *file, hid_t dxpl_id, void **req);
+} H5VL_file_class_t;
+
+/* H5G routines */
+typedef struct H5VL_group_class_t {
+    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+        hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
+    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+                  hid_t gapl_id, hid_t dxpl_id, void **req);
+    herr_t (*get)(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, H5VL_group_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*close) (void *grp, hid_t dxpl_id, void **req);
+} H5VL_group_class_t;
+
+/* H5L routines */
+typedef struct H5VL_link_class_t {
+    herr_t (*create)(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params,
+            hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req, va_list argumenmts);
+    herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1,
+                   void *dst_obj, const H5VL_loc_params_t *loc_params2,
+                   hid_t lcpl, hid_t lapl, hid_t dxpl_id, void **req);
+    herr_t (*move)(void *src_obj, const H5VL_loc_params_t *loc_params1,
+                   void *dst_obj, const H5VL_loc_params_t *loc_params2,
+                   hid_t lcpl, hid_t lapl, hid_t dxpl_id, void **req);
+    herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type,
+                  hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+} H5VL_link_class_t;
+
+/* H5O routines */
+typedef struct H5VL_object_class_t {
+    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type,
+                  hid_t dxpl_id, void **req);
+    herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name,
+                   void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name,
+                   hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
+    herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type,
+                  hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type,
+                       hid_t dxpl_id, void **req, va_list arguments);
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+} H5VL_object_class_t;
+
+/* Asynchronous request 'notify' callback */
+typedef herr_t (*H5VL_request_notify_t)(void *ctx, H5ES_status_t status);
+
+/* Async request operation routines */
+typedef struct H5VL_request_class_t {
+    herr_t (*wait)(void *req, uint64_t timeout, H5ES_status_t *status);
+    herr_t (*notify)(void *req, H5VL_request_notify_t cb, void *ctx);
+    herr_t (*cancel)(void *req);
+    herr_t (*specific)(void *req, H5VL_request_specific_t specific_type, va_list arguments);
+    herr_t (*optional)(void *req, va_list arguments);
+    herr_t (*free)(void *req);
+} H5VL_request_class_t;
+
+/*
+ * VOL connector identifiers.  Values 0 through 255 are for connectors defined
+ * by the HDF5 library.  Values 256 through 511 are available for testing new
+ * filters.  Subsequent values should be obtained from the HDF5 development
+ * team at help@hdfgroup.org.
+ */
+typedef int H5VL_class_value_t;
+
+/* Class information for each VOL connector */
+typedef struct H5VL_class_t {
+    /* Overall connector fields & callbacks */
+    unsigned int version;                   /* VOL connector class struct version #     */
+    H5VL_class_value_t value;               /* Value to identify connector              */
+    const char *name;                       /* Connector name (MUST be unique!)         */
+    unsigned cap_flags;                     /* Capability flags for connector           */
+    herr_t (*initialize)(hid_t vipl_id);    /* Connector initialization callback        */
+    herr_t (*terminate)(void);              /* Connector termination callback           */
+
+    /* VOL framework */
+    H5VL_info_class_t       info_cls;       /* VOL info fields & callbacks  */
+    H5VL_wrap_class_t       wrap_cls;       /* VOL object wrap / retrieval callbacks */
+
+    /* Data Model */
+    H5VL_attr_class_t       attr_cls;       /* Attribute (H5A*) class callbacks */
+    H5VL_dataset_class_t    dataset_cls;    /* Dataset (H5D*) class callbacks   */
+    H5VL_datatype_class_t   datatype_cls;   /* Datatype (H5T*) class callbacks  */
+    H5VL_file_class_t       file_cls;       /* File (H5F*) class callbacks      */
+    H5VL_group_class_t      group_cls;      /* Group (H5G*) class callbacks     */
+    H5VL_link_class_t       link_cls;       /* Link (H5L*) class callbacks      */
+    H5VL_object_class_t     object_cls;     /* Object (H5O*) class callbacks    */
+
+    /* Services */
+    H5VL_request_class_t    request_cls;    /* Asynchronous request class callbacks */
+
+    /* Catch-all */
+    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments); /* Optional callback */
+} H5VL_class_t;
+
+
+/********************/
+/* Public Variables */
+/********************/
+
+/*********************/
+/* Public Prototypes */
+/*********************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Helper routines for VOL connector authors */
+H5_DLL void *H5VLobject(hid_t obj_id);
+
+/* Public wrappers for generic callbacks */
+H5_DLL herr_t H5VLinitialize(hid_t connector_id, hid_t vipl_id);
+H5_DLL herr_t H5VLterminate(hid_t connector_id);
+H5_DLL herr_t H5VLget_cap_flags(hid_t connector_id, unsigned *cap_flags);
+H5_DLL herr_t H5VLget_value(hid_t connector_id, H5VL_class_value_t *conn_value);
+
+/* Public wrappers for info fields and callbacks */
+H5_DLL herr_t H5VLcopy_connector_info(hid_t connector_id, void **dst_vol_info, void *src_vol_info);
+H5_DLL herr_t H5VLcmp_connector_info(int *cmp, hid_t connector_id, const void *info1,
+    const void *info2);
+H5_DLL herr_t H5VLfree_connector_info(hid_t connector_id, void *vol_info);
+H5_DLL herr_t H5VLconnector_info_to_str(const void *info, hid_t connector_id, char **str);
+H5_DLL herr_t H5VLconnector_str_to_info(const char *str, hid_t connector_id, void **info);
+
+/* Public wrappers for attribute callbacks */
+H5_DLL void *H5VLattr_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *attr_name, hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VLattr_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t aapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLattr_read(void *attr, hid_t connector_id, hid_t dtype_id, void *buf, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLattr_write(void *attr, hid_t connector_id, hid_t dtype_id, const void *buf, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLattr_get(void *obj, hid_t connector_id, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLattr_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_attr_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLattr_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLattr_close(void *attr, hid_t connector_id, hid_t dxpl_id, void **req);
+
+/* Public wrappers for dataset callbacks */
+H5_DLL void *H5VLdataset_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t lcpl_id, hid_t type_id, hid_t space_id, hid_t dcpl_id, hid_t dapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VLdataset_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t dapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLdataset_read(void *dset, hid_t connector_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, void *buf, void **req);
+H5_DLL herr_t H5VLdataset_write(void *dset, hid_t connector_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, const void *buf, void **req);
+H5_DLL herr_t H5VLdataset_get(void *dset, hid_t connector_id, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdataset_specific(void *obj, hid_t connector_id, H5VL_dataset_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdataset_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdataset_close(void *dset, hid_t connector_id, hid_t dxpl_id, void **req);
+
+/* Public wrappers for file callbacks */
+H5_DLL void *H5VLfile_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VLfile_open(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLfile_get(void *file, hid_t connector_id, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLfile_specific(void *obj, hid_t connector_id, H5VL_file_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLfile_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLfile_close(void *file, hid_t connector_id, hid_t dxpl_id, void **req);
+
+/* Public wrappers for group callbacks */
+H5_DLL void *H5VLgroup_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VLgroup_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t gapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLgroup_get(void *obj, hid_t connector_id, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLgroup_specific(void *obj, hid_t connector_id, H5VL_group_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLgroup_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLgroup_close(void *grp, hid_t connector_id, hid_t dxpl_id, void **req);
+
+/* Public wrappers for link callbacks */
+H5_DLL herr_t H5VLlink_create(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLlink_copy(void *src_obj, const H5VL_loc_params_t *loc_params1,
+                             void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t connector_id,
+                             hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLlink_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
+                             void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t connector_id,
+                             hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLlink_get(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_link_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLlink_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_link_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLlink_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+
+/* Public wrappers for object callbacks */
+H5_DLL void *H5VLobject_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5I_type_t *opened_type, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLobject_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name,
+                               void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name,
+                               hid_t connector_id, hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLobject_get(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_object_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLobject_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_object_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLobject_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+
+/* Public wrappers for named datatype callbacks */
+H5_DLL void *H5VLdatatype_commit(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VLdatatype_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t tapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VLdatatype_get(void *dt, hid_t connector_id, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdatatype_specific(void *obj, hid_t connector_id, H5VL_datatype_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdatatype_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VLdatatype_close(void *dt, hid_t connector_id, hid_t dxpl_id, void **req);
+
+/* Public wrappers for asynchronous request callbacks */
+H5_DLL herr_t H5VLrequest_wait(void *req, hid_t connector_id, uint64_t timeout, H5ES_status_t *status);
+H5_DLL herr_t H5VLrequest_notify(void *req, hid_t connector_id, H5VL_request_notify_t cb, void *ctx);
+H5_DLL herr_t H5VLrequest_cancel(void *req, hid_t connector_id);
+H5_DLL herr_t H5VLrequest_specific(void *req, hid_t connector_id, H5VL_request_specific_t specific_type, va_list arguments);
+H5_DLL herr_t H5VLrequest_optional(void *req, hid_t connector_id, va_list arguments);
+H5_DLL herr_t H5VLrequest_free(void *req, hid_t connector_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _H5VLconnector_H */
+
diff --git a/src/H5VLconnector_passthru.h b/src/H5VLconnector_passthru.h
new file mode 100644
index 0000000..5083cb4
--- /dev/null
+++ b/src/H5VLconnector_passthru.h
@@ -0,0 +1,80 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * This file contains public declarations for authoring VOL connectors
+ * which act as "passthrough" connectors that forward their API calls to
+ * an underlying connector. 
+ *
+ * An example of this might be a logging connector, which creates log messages
+ * and then passes the call on to an underlying VOL connector.
+ *
+ * The functionality required to implement such a connector is specialized
+ * and non-trivial so it has been split into this header in an effort to keep
+ * the H5VLpublic_dev.h header easier to understand.
+ */
+
+#ifndef _H5VLconnector_passthru_H
+#define _H5VLconnector_passthru_H
+
+/* Public headers needed by this file */
+#include "H5public.h"           /* Generic Functions                    */
+#include "H5Ipublic.h"          /* IDs                                  */
+#include "H5VLpublic.h"         /* Virtual Object Layer                 */
+
+/* Semi-public headers mainly for VOL connector authors */
+#include "H5VLconnector.h"
+
+
+/*****************/
+/* Public Macros */
+/*****************/
+
+/*******************/
+/* Public Typedefs */
+/*******************/
+
+/********************/
+/* Public Variables */
+/********************/
+
+/*********************/
+/* Public Prototypes */
+/*********************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Helper routines for VOL connector authors */
+H5_DLL herr_t H5VLcmp_connector_cls(int *cmp, hid_t connector_id1, hid_t connector_id2);
+H5_DLL hid_t H5VLwrap_register(void *obj, H5I_type_t type);
+H5_DLL herr_t H5VLretrieve_lib_state(void **state);
+H5_DLL herr_t H5VLrestore_lib_state(const void *state);
+H5_DLL herr_t H5VLreset_lib_state(void);
+H5_DLL herr_t H5VLfree_lib_state(void *state);
+
+/* Pass-through callbacks */
+H5_DLL void *H5VLget_object(void *obj, hid_t connector_id);
+H5_DLL herr_t H5VLget_wrap_ctx(void *obj, hid_t connector_id, void **wrap_ctx);
+H5_DLL void *H5VLwrap_object(void *obj, H5I_type_t obj_type, hid_t connector_id,
+    void *wrap_ctx);
+H5_DLL void *H5VLunwrap_object(void *obj, hid_t connector_id);
+H5_DLL herr_t H5VLfree_wrap_ctx(void *wrap_ctx, hid_t connector_id);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _H5VLconnector_passthru_H */
+
diff --git a/src/H5VLpassthru.c b/src/H5VLpassthru.c
index ef92ddb..f0672b2 100644
--- a/src/H5VLpassthru.c
+++ b/src/H5VLpassthru.c
@@ -29,13 +29,17 @@
 
 
 /* Header files needed */
-/* (Public HDF5 and standard C / POSIX only) */
+/* Do NOT include private HDF5 files here! */
 #include <assert.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+/* Public HDF5 file */
 #include "hdf5.h"
+
+/* This connector's header */
 #include "H5VLpassthru.h"
 
 
diff --git a/src/H5VLpublic.h b/src/H5VLpublic.h
index ebe424a..326e65e 100644
--- a/src/H5VLpublic.h
+++ b/src/H5VLpublic.h
@@ -19,387 +19,29 @@
 
 /* Public headers needed by this file */
 #include "H5public.h"           /* Generic Functions                    */
-#include "H5Apublic.h"          /* Attributes                           */
-#include "H5ESpublic.h"         /* Event Stack                          */
-#include "H5Fpublic.h"          /* Files                                */
-#include "H5Ipublic.h"		/* IDs			  		*/
-#include "H5Lpublic.h"          /* Links                                */
-#include "H5Opublic.h"          /* Objects                              */
-#include "H5Rpublic.h"          /* References                           */
+#include "H5Ipublic.h"          /* IDs                                  */
+
+/* Semi-public headers mainly for VOL connector authors */
+#include "H5VLconnector.h"
+#include "H5VLconnector_passthru.h"
 
 
 /*****************/
 /* Public Macros */
 /*****************/
 
-/* Default VOL connector value */
-#define H5VL_VOL_DEFAULT                    0
-
-
-/*******************/
-/* Public Typedefs */
-/*******************/
-
-/* types for attribute GET callback */
-typedef enum H5VL_attr_get_t {
-    H5VL_ATTR_GET_ACPL,                     /* creation property list              */
-    H5VL_ATTR_GET_INFO,                     /* info                                */
-    H5VL_ATTR_GET_NAME,                     /* access property list                */
-    H5VL_ATTR_GET_SPACE,                    /* dataspace                           */
-    H5VL_ATTR_GET_STORAGE_SIZE,             /* storage size                        */
-    H5VL_ATTR_GET_TYPE                      /* datatype                            */
-} H5VL_attr_get_t;
-
-/* types for attribute SPECFIC callback */
-typedef enum H5VL_attr_specific_t {
-    H5VL_ATTR_DELETE,                       /* H5Adelete(_by_name/idx)             */
-    H5VL_ATTR_EXISTS,                       /* H5Aexists(_by_name)                 */
-    H5VL_ATTR_ITER,                         /* H5Aiterate(_by_name)                */
-    H5VL_ATTR_RENAME                        /* H5Arename(_by_name)                 */
-} H5VL_attr_specific_t;
-
-/* types for dataset GET callback */
-typedef enum H5VL_dataset_get_t {
-    H5VL_DATASET_GET_DAPL,                  /* access property list                */
-    H5VL_DATASET_GET_DCPL,                  /* creation property list              */
-    H5VL_DATASET_GET_OFFSET,                /* offset                              */
-    H5VL_DATASET_GET_SPACE,                 /* dataspace                           */
-    H5VL_DATASET_GET_SPACE_STATUS,          /* space  status                       */
-    H5VL_DATASET_GET_STORAGE_SIZE,          /* storage size                        */
-    H5VL_DATASET_GET_TYPE                   /* datatype                            */
-} H5VL_dataset_get_t;
-
-/* types for dataset SPECFIC callback */
-typedef enum H5VL_dataset_specific_t {
-    H5VL_DATASET_SET_EXTENT,                /* H5Dset_extent                       */
-    H5VL_DATASET_FLUSH,                     /* H5Dflush                            */
-    H5VL_DATASET_REFRESH                    /* H5Drefresh                          */
-} H5VL_dataset_specific_t;
-
-/* types for datatype GET callback */
-typedef enum H5VL_datatype_get_t {
-    H5VL_DATATYPE_GET_BINARY,               /* get serialized form of transient type */
-    H5VL_DATATYPE_GET_TCPL	                /* datatype creation property list	   */
-} H5VL_datatype_get_t;
-
-/* types for datatype SPECFIC callback */
-typedef enum H5VL_datatype_specific_t {
-    H5VL_DATATYPE_FLUSH,
-    H5VL_DATATYPE_REFRESH
-} H5VL_datatype_specific_t;
-
-/* types for file GET callback */
-typedef enum H5VL_file_get_t {
-    H5VL_FILE_GET_FAPL,                     /* file access property list	*/
-    H5VL_FILE_GET_FCPL,	                    /* file creation property list	*/
-    H5VL_FILE_GET_INTENT,	            /* file intent           		*/
-    H5VL_FILE_GET_FILENO,	            /* file number           		*/
-    H5VL_FILE_GET_NAME,	                    /* file name             		*/
-    H5VL_FILE_GET_OBJ_COUNT,	            /* object count in file	       	*/
-    H5VL_FILE_GET_OBJ_IDS	            /* object ids in file     		*/
-} H5VL_file_get_t;
-
-/* types for file SPECIFIC callback */
-typedef enum H5VL_file_specific_t {
-    H5VL_FILE_FLUSH,                        /* Flush file                       */
-    H5VL_FILE_REOPEN,                       /* Reopen the file                  */
-    H5VL_FILE_MOUNT,                        /* Mount a file                     */
-    H5VL_FILE_UNMOUNT,                      /* Unmount a file                   */
-    H5VL_FILE_IS_ACCESSIBLE                 /* Check if a file is accessible    */
-} H5VL_file_specific_t;
-
-/* types for group GET callback */
-typedef enum H5VL_group_get_t {
-    H5VL_GROUP_GET_GCPL,	            /* group creation property list	*/
-    H5VL_GROUP_GET_INFO 	            /* group info             		*/
-} H5VL_group_get_t;
-
-/* types for group SPECFIC callback */
-typedef enum H5VL_group_specific_t {
-    H5VL_GROUP_FLUSH,
-    H5VL_GROUP_REFRESH
-} H5VL_group_specific_t;
-
-/* link create types for VOL */
-typedef enum H5VL_link_create_type_t {
-    H5VL_LINK_CREATE_HARD,
-    H5VL_LINK_CREATE_SOFT,
-    H5VL_LINK_CREATE_UD
-} H5VL_link_create_type_t;
-
-/* types for link GET callback */
-typedef enum H5VL_link_get_t {
-    H5VL_LINK_GET_INFO,        /* link info         		    */
-    H5VL_LINK_GET_NAME,	       /* link name                         */
-    H5VL_LINK_GET_VAL          /* link value                        */
-} H5VL_link_get_t;
-
-/* types for link SPECIFIC callback */
-typedef enum H5VL_link_specific_t {
-    H5VL_LINK_DELETE,          /* H5Ldelete(_by_idx)                */
-    H5VL_LINK_EXISTS,          /* link existence                    */
-    H5VL_LINK_ITER             /* H5Literate/visit(_by_name)              */
-} H5VL_link_specific_t;
-
-/* types for object GET callback */
-typedef enum H5VL_object_get_t {
-    H5VL_REF_GET_NAME,                 /* object name, for reference        */
-    H5VL_REF_GET_REGION,               /* dataspace of region               */
-    H5VL_REF_GET_TYPE,                 /* type of object                    */
-    H5VL_OBJECT_GET_NAME               /* object name                       */
-} H5VL_object_get_t;
-
-/* types for object SPECIFIC callback */
-typedef enum H5VL_object_specific_t {
-    H5VL_OBJECT_CHANGE_REF_COUNT,       /* H5Oincr/decr_refcount             */
-    H5VL_OBJECT_EXISTS,                 /* H5Oexists_by_name                 */
-    H5VL_OBJECT_VISIT,                  /* H5Ovisit(_by_name)                */
-    H5VL_REF_CREATE,                    /* H5Rcreate                         */
-    H5VL_OBJECT_FLUSH,                  /* H5{D|G|O|T}flush                  */
-    H5VL_OBJECT_REFRESH                 /* H5{D|G|O|T}refresh                */
-} H5VL_object_specific_t;
-
-/* types for async request SPECIFIC callback */
-typedef enum H5VL_request_specific_t {
-    H5VL_REQUEST_WAITANY,               /* Wait until any request completes */
-    H5VL_REQUEST_WAITSOME,              /* Wait until at least one requesst completes */
-    H5VL_REQUEST_WAITALL                /* Wait until all requests complete */
-} H5VL_request_specific_t;
-
-/* types for different ways that objects are located in an HDF5 container */
-typedef enum H5VL_loc_type_t {
-    H5VL_OBJECT_BY_SELF,
-    H5VL_OBJECT_BY_NAME,
-    H5VL_OBJECT_BY_IDX,
-    H5VL_OBJECT_BY_ADDR,
-    H5VL_OBJECT_BY_REF
-} H5VL_loc_type_t;
-
-struct H5VL_loc_by_name {
-    const char *name;
-    hid_t lapl_id;
-};
-
-struct H5VL_loc_by_idx {
-    const char *name;
-    H5_index_t idx_type;
-    H5_iter_order_t order;
-    hsize_t n;
-    hid_t lapl_id;
-};
-
-struct H5VL_loc_by_addr {
-    haddr_t addr;
-};
-
-struct H5VL_loc_by_ref {
-    H5R_type_t ref_type;
-    const void *_ref;
-    hid_t lapl_id;
-};
-
-/* Structure to hold parameters for object locations. 
- * either: BY_ADDR, BY_ID, BY_NAME, BY_IDX, BY_REF
- *
- * Note: Leave loc_by_addr as the first union member so we
- *       can perform the simplest initialization of the struct
- *       without raising warnings.
+/* VOL connector identifier values
+ * These are H5VL_class_value_t values, NOT hid_t values!
  */
-typedef struct H5VL_loc_params_t {
-    H5I_type_t      obj_type;
-    H5VL_loc_type_t type;
-    union{
-        struct H5VL_loc_by_addr loc_by_addr;
-        struct H5VL_loc_by_name loc_by_name;
-        struct H5VL_loc_by_idx  loc_by_idx;
-        struct H5VL_loc_by_ref  loc_by_ref;
-    } loc_data;
-} H5VL_loc_params_t;
-
-/* VOL connector info fields & callbacks */
-typedef struct H5VL_info_class_t {
-    size_t size;                                    /* Size of the VOL info                         */
-    void * (*copy)(const void *info);               /* Callback to create a copy of the VOL info    */
-    herr_t (*cmp)(int *cmp_value, const void *info1, const void *info2); /* Callback to compare VOL info */
-    herr_t (*free)(void *info);                     /* Callback to release a VOL info               */
-    herr_t (*to_str)(const void *info, char **str); /* Callback to serialize connector's info into a string */
-    herr_t (*from_str)(const char *str, void **info); /* Callback to deserialize a string into connector's info */
-} H5VL_info_class_t;
-
-/* VOL object wrap / retrieval callbacks */
-/* (These only need to be implemented by "pass through" VOL connectors) */
-typedef struct H5VL_wrap_class_t {
-    void * (*get_object)(const void *obj);          /* Callback to retrieve underlying object       */
-    herr_t (*get_wrap_ctx)(const void *obj, void **wrap_ctx); /* Callback to retrieve the object wrapping context for the connector */
-    void * (*wrap_object)(void *obj, H5I_type_t obj_type, void *wrap_ctx); /* Callback to wrap a library object */
-    void * (*unwrap_object)(void *obj);             /* Callback to unwrap a library object */
-    herr_t (*free_wrap_ctx)(void *wrap_ctx);        /* Callback to release the object wrapping context for the connector */
-} H5VL_wrap_class_t;
-
-/* H5A routines */
-typedef struct H5VL_attr_class_t {
-    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
-            hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id,
-            hid_t dxpl_id, void **req);
-    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
-                  hid_t aapl_id, hid_t dxpl_id, void **req);
-    herr_t (*read)(void *attr, hid_t mem_type_id, void *buf, hid_t dxpl_id, void **req);
-    herr_t (*write)(void *attr, hid_t mem_type_id, const void *buf, hid_t dxpl_id, void **req);
-    herr_t (*get)(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*close) (void *attr, hid_t dxpl_id, void **req);
-} H5VL_attr_class_t;
-
-/* H5D routines */
-typedef struct H5VL_dataset_class_t {
-    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-            hid_t lcpl_id, hid_t type_id, hid_t space_id, hid_t dcpl_id,
-            hid_t dapl_id, hid_t dxpl_id, void **req);
-    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-                  hid_t dapl_id, hid_t dxpl_id, void **req);
-    herr_t (*read)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
-                   hid_t xfer_plist_id, void * buf, void **req);
-    herr_t (*write)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
-                    hid_t xfer_plist_id, const void * buf, void **req);
-    herr_t (*get)(void *obj, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, H5VL_dataset_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*close) (void *dset, hid_t dxpl_id, void **req);
-} H5VL_dataset_class_t;
-
-/* H5T routines*/
-typedef struct H5VL_datatype_class_t {
-    void *(*commit)(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t type_id,
-                    hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
-    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char * name,
-                  hid_t tapl_id, hid_t dxpl_id, void **req);
-    herr_t (*get)   (void *obj, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, H5VL_datatype_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*close) (void *dt, hid_t dxpl_id, void **req);
-} H5VL_datatype_class_t;
-
-/* H5F routines */
-typedef struct H5VL_file_class_t {
-    void *(*create)(const char *name, unsigned flags, hid_t fcpl_id,
-                    hid_t fapl_id, hid_t dxpl_id, void **req);
-    void *(*open)(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
-    herr_t (*get)(void *obj, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, H5VL_file_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*close) (void *file, hid_t dxpl_id, void **req);
-} H5VL_file_class_t;
-
-/* H5G routines */
-typedef struct H5VL_group_class_t {
-    void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-        hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
-    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-                  hid_t gapl_id, hid_t dxpl_id, void **req);
-    herr_t (*get)(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, H5VL_group_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*close) (void *grp, hid_t dxpl_id, void **req);
-} H5VL_group_class_t;
-
-/* H5L routines */
-typedef struct H5VL_link_class_t {
-    herr_t (*create)(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params,
-            hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req, va_list argumenmts);
-    herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                   void *dst_obj, const H5VL_loc_params_t *loc_params2,
-                   hid_t lcpl, hid_t lapl, hid_t dxpl_id, void **req);
-    herr_t (*move)(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                   void *dst_obj, const H5VL_loc_params_t *loc_params2,
-                   hid_t lcpl, hid_t lapl, hid_t dxpl_id, void **req);
-    herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type,
-                  hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-} H5VL_link_class_t;
-
-/* H5O routines */
-typedef struct H5VL_object_class_t {
-    void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type,
-                  hid_t dxpl_id, void **req);
-    herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name,
-                   void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name,
-                   hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
-    herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type,
-                  hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type,
-                       hid_t dxpl_id, void **req, va_list arguments);
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-} H5VL_object_class_t;
-
-/* Asynchronous request 'notify' callback */
-typedef herr_t (*H5VL_request_notify_t)(void *ctx, H5ES_status_t status);
-
-/* Async request operation routines */
-typedef struct H5VL_request_class_t {
-    herr_t (*wait)(void *req, uint64_t timeout, H5ES_status_t *status);
-    herr_t (*notify)(void *req, H5VL_request_notify_t cb, void *ctx);
-    herr_t (*cancel)(void *req);
-    herr_t (*specific)(void *req, H5VL_request_specific_t specific_type, va_list arguments);
-    herr_t (*optional)(void *req, va_list arguments);
-    herr_t (*free)(void *req);
-} H5VL_request_class_t;
-
-/*
- * VOL connector identifiers.  Values 0 through 255 are for connectors defined
- * by the HDF5 library.  Values 256 through 511 are available for testing new
- * filters.  Subsequent values should be obtained from the HDF5 development
- * team at help@hdfgroup.org.
- */
-typedef int H5VL_class_value_t;
-
-/* VOL connector identifier values */
 #define H5_VOL_INVALID  (-1)    /* Invalid ID for VOL connector iD */
 #define H5_VOL_NATIVE   0       /* Native HDF5 file formnat VOL connector */
 #define H5_VOL_RESERVED 256     /* VOL connector IDs below this value are reserved for library use */
-#define H5_VOL_MAX	65535	/* Maximum VOL connector ID */
-
-/* Capability flags for connector */
-#define H5VL_CAP_FLAG_NONE              0       /* No special connector capabilities */
-#define H5VL_CAP_FLAG_THREADSAFE        0x01    /* Connector is threadsafe */
-
-/* Class information for each VOL connector */
-typedef struct H5VL_class_t {
-    /* Overall connector fields & callbacks */
-    unsigned int version;                   /* VOL connector class struct version #     */
-    H5VL_class_value_t value;               /* Value to identify connector              */
-    const char *name;                       /* Connector name (MUST be unique!)         */
-    unsigned cap_flags;                     /* Capability flags for connector           */
-    herr_t (*initialize)(hid_t vipl_id);    /* Connector initialization callback        */
-    herr_t (*terminate)(void);              /* Connector termination callback           */
+#define H5_VOL_MAX      65535   /* Maximum VOL connector ID */
 
-    /* VOL framework */
-    H5VL_info_class_t       info_cls;       /* VOL info fields & callbacks  */
-    H5VL_wrap_class_t       wrap_cls;       /* VOL object wrap / retrieval callbacks */
-
-    /* Data Model */
-    H5VL_attr_class_t       attr_cls;       /* Attribute (H5A*) class callbacks */
-    H5VL_dataset_class_t    dataset_cls;    /* Dataset (H5D*) class callbacks   */
-    H5VL_datatype_class_t   datatype_cls;   /* Datatype (H5T*) class callbacks  */
-    H5VL_file_class_t       file_cls;       /* File (H5F*) class callbacks      */
-    H5VL_group_class_t      group_cls;      /* Group (H5G*) class callbacks     */
-    H5VL_link_class_t       link_cls;       /* Link (H5L*) class callbacks      */
-    H5VL_object_class_t     object_cls;     /* Object (H5O*) class callbacks    */
-
-    /* Services */
-    H5VL_request_class_t    request_cls;    /* Asynchronous request class callbacks */
-
-    /* Catch-all */
-    herr_t (*optional)(void *obj, hid_t dxpl_id, void **req, va_list arguments); /* Optional callback */
-} H5VL_class_t;
 
+/*******************/
+/* Public Typedefs */
+/*******************/
 
 /********************/
 /* Public Variables */
@@ -413,7 +55,10 @@ typedef struct H5VL_class_t {
 extern "C" {
 #endif
 
-/* VOL Connector Functionality */
+/* The H5VL types uses in the API calls are not opaque - they are defined in
+ * H5VLconnector.h, which is included at the top of this file.
+ */
+
 H5_DLL hid_t H5VLregister_connector(const H5VL_class_t *cls, hid_t vipl_id);
 H5_DLL hid_t H5VLregister_connector_by_name(const char *connector_name, hid_t vipl_id);
 H5_DLL hid_t H5VLregister_connector_by_value(H5VL_class_value_t connector_value, hid_t vipl_id);
@@ -424,112 +69,6 @@ H5_DLL herr_t H5VLclose(hid_t connector_id);
 H5_DLL herr_t H5VLunregister_connector(hid_t connector_id);
 
 
-/*****************************************************************************
- * VOL callback wrappers and helper routines, for _VOL_connector_ authors only! *
- * (Not part of the public API for _application_ developers)                 *
- *****************************************************************************/
-
-/* Helper routines for VOL connector authors */
-H5_DLL herr_t H5VLcmp_connector_cls(int *cmp, hid_t connector_id1, hid_t connector_id2);
-H5_DLL hid_t H5VLwrap_register(void *obj, H5I_type_t type);
-H5_DLL void *H5VLobject(hid_t obj_id);
-H5_DLL herr_t H5VLretrieve_lib_state(void **state);
-H5_DLL herr_t H5VLrestore_lib_state(const void *state);
-H5_DLL herr_t H5VLreset_lib_state(void);
-H5_DLL herr_t H5VLfree_lib_state(void *state);
-
-
-/* Public wrappers for generic callbacks */
-H5_DLL herr_t H5VLinitialize(hid_t connector_id, hid_t vipl_id);
-H5_DLL herr_t H5VLterminate(hid_t connector_id);
-H5_DLL herr_t H5VLget_cap_flags(hid_t connector_id, unsigned *cap_flags);
-H5_DLL herr_t H5VLget_value(hid_t connector_id, H5VL_class_value_t *conn_value);
-H5_DLL herr_t H5VLcopy_connector_info(hid_t connector_id, void **dst_vol_info, void *src_vol_info);
-H5_DLL herr_t H5VLcmp_connector_info(int *cmp, hid_t connector_id, const void *info1,
-    const void *info2);
-H5_DLL herr_t H5VLfree_connector_info(hid_t connector_id, void *vol_info);
-H5_DLL herr_t H5VLconnector_info_to_str(const void *info, hid_t connector_id, char **str);
-H5_DLL herr_t H5VLconnector_str_to_info(const char *str, hid_t connector_id, void **info);
-H5_DLL void *H5VLget_object(void *obj, hid_t connector_id);
-H5_DLL herr_t H5VLget_wrap_ctx(void *obj, hid_t connector_id, void **wrap_ctx);
-H5_DLL void *H5VLwrap_object(void *obj, H5I_type_t obj_type, hid_t connector_id,
-    void *wrap_ctx);
-H5_DLL void *H5VLunwrap_object(void *obj, hid_t connector_id);
-H5_DLL herr_t H5VLfree_wrap_ctx(void *wrap_ctx, hid_t connector_id);
-
-/* Public wrappers for attribute callbacks */
-H5_DLL void *H5VLattr_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *attr_name, hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id, hid_t dxpl_id, void **req);
-H5_DLL void *H5VLattr_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t aapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLattr_read(void *attr, hid_t connector_id, hid_t dtype_id, void *buf, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLattr_write(void *attr, hid_t connector_id, hid_t dtype_id, const void *buf, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLattr_get(void *obj, hid_t connector_id, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLattr_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_attr_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLattr_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLattr_close(void *attr, hid_t connector_id, hid_t dxpl_id, void **req);
-
-/* Public wrappers for dataset callbacks */
-H5_DLL void *H5VLdataset_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t lcpl_id, hid_t type_id, hid_t space_id, hid_t dcpl_id, hid_t dapl_id, hid_t dxpl_id, void **req);
-H5_DLL void *H5VLdataset_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t dapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLdataset_read(void *dset, hid_t connector_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, void *buf, void **req);
-H5_DLL herr_t H5VLdataset_write(void *dset, hid_t connector_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, const void *buf, void **req);
-H5_DLL herr_t H5VLdataset_get(void *dset, hid_t connector_id, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdataset_specific(void *obj, hid_t connector_id, H5VL_dataset_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdataset_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdataset_close(void *dset, hid_t connector_id, hid_t dxpl_id, void **req);
-
-/* Public wrappers for file callbacks */
-H5_DLL void *H5VLfile_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, hid_t dxpl_id, void **req);
-H5_DLL void *H5VLfile_open(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLfile_get(void *file, hid_t connector_id, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLfile_specific(void *obj, hid_t connector_id, H5VL_file_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLfile_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLfile_close(void *file, hid_t connector_id, hid_t dxpl_id, void **req);
-
-/* Public wrappers for group callbacks */
-H5_DLL void *H5VLgroup_create(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
-H5_DLL void *H5VLgroup_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t gapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLgroup_get(void *obj, hid_t connector_id, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLgroup_specific(void *obj, hid_t connector_id, H5VL_group_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLgroup_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLgroup_close(void *grp, hid_t connector_id, hid_t dxpl_id, void **req);
-
-/* Public wrappers for link callbacks */
-H5_DLL herr_t H5VLlink_create(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLlink_copy(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                             void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t connector_id,
-                             hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLlink_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                             void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t connector_id,
-                             hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLlink_get(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_link_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLlink_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_link_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLlink_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-
-/* Public wrappers for object callbacks */
-H5_DLL void *H5VLobject_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5I_type_t *opened_type, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLobject_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name,
-                               void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name,
-                               hid_t connector_id, hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLobject_get(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_object_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLobject_specific(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, H5VL_object_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLobject_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-
-/* Public wrappers for named datatype callbacks */
-H5_DLL void *H5VLdatatype_commit(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
-H5_DLL void *H5VLdatatype_open(void *obj, const H5VL_loc_params_t *loc_params, hid_t connector_id, const char *name, hid_t tapl_id, hid_t dxpl_id, void **req);
-H5_DLL herr_t H5VLdatatype_get(void *dt, hid_t connector_id, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdatatype_specific(void *obj, hid_t connector_id, H5VL_datatype_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdatatype_optional(void *obj, hid_t connector_id, hid_t dxpl_id, void **req, va_list arguments);
-H5_DLL herr_t H5VLdatatype_close(void *dt, hid_t connector_id, hid_t dxpl_id, void **req);
-
-/* Public wrappers for asynchronous request callbacks */
-H5_DLL herr_t H5VLrequest_wait(void *req, hid_t connector_id, uint64_t timeout, H5ES_status_t *status);
-H5_DLL herr_t H5VLrequest_notify(void *req, hid_t connector_id, H5VL_request_notify_t cb, void *ctx);
-H5_DLL herr_t H5VLrequest_cancel(void *req, hid_t connector_id);
-H5_DLL herr_t H5VLrequest_specific(void *req, hid_t connector_id, H5VL_request_specific_t specific_type, va_list arguments);
-H5_DLL herr_t H5VLrequest_optional(void *req, hid_t connector_id, va_list arguments);
-H5_DLL herr_t H5VLrequest_free(void *req, hid_t connector_id);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/Makefile.am b/src/Makefile.am
index 378e390..0368739 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -115,9 +115,9 @@ libhdf5_la_SOURCES= H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Torder.c \
         H5Tpad.c H5Tprecis.c H5Tstrpad.c H5Tvisit.c H5Tvlen.c H5TS.c \
         H5VL.c H5VLcallback.c H5VLint.c H5VLnative.c \
-		H5VLnative_attr.c H5VLnative_dataset.c H5VLnative_datatype.c \
-		H5VLnative_file.c H5VLnative_group.c H5VLnative_link.c H5VLnative_object.c \
-		H5VLpassthru.c \
+        H5VLnative_attr.c H5VLnative_dataset.c H5VLnative_datatype.c \
+        H5VLnative_file.c H5VLnative_group.c H5VLnative_link.c H5VLnative_object.c \
+        H5VLpassthru.c \
         H5VM.c H5WB.c H5Z.c  \
         H5Zdeflate.c H5Zfletcher32.c H5Znbit.c H5Zshuffle.c \
         H5Zscaleoffset.c H5Zszip.c H5Ztrans.c
@@ -144,7 +144,9 @@ include_HEADERS = hdf5.h H5api_adpt.h H5overflow.h H5pubconf.h H5public.h H5vers
         H5MMpublic.h H5Opublic.h H5Ppublic.h \
         H5PLextern.h H5PLpublic.h \
         H5Rpublic.h H5Spublic.h H5Tpublic.h \
-        H5VLnative.h H5VLpassthru.h H5VLpublic.h H5Zpublic.h
+        H5VLconnector.h H5VLconnector_passthru.h \
+        H5VLnative.h H5VLpassthru.h H5VLpublic.h \
+        H5Zpublic.h
 
 # install libhdf5.settings in lib directory
 settingsdir=$(libdir)
diff --git a/test/null_vol_connector.c b/test/null_vol_connector.c
index b78e859..5ed8545 100644
--- a/test/null_vol_connector.c
+++ b/test/null_vol_connector.c
@@ -15,8 +15,15 @@
  *              (registration, etc.).
  */
 
+
+/* Public HDF5 header */
+#include "hdf5.h"
+
+/* For HDF5 plugin functionality */
 #include "H5PLextern.h"
 
+
+/* This connector's header */
 #include "null_vol_connector.h"
 
 /* The VOL class struct */