Refactor all the 'H5VL_*_optional' callbacks to move the type of operation out

of the va_list, so it's at least possible for another connector to know what
the operation is and decide whether to implement it or not.

Added a new VOL sub-class called "introspect" where callbacks that report
information about the connector or container can be placed.  Added an
'opt_query' callback to this sub-class, for a connector to report back
to the library whether a particular optional callback operation is supported.
Also added a 'get_conn_cls' introspection callback, to retrieve the H5VL_class_t
of a connector (either the "current" connector, H5VL_GET_CONN_LVL_CURR, or
the terminal connector, H5VL_GET_CONN_LVL_TERM).

Moved the "post open" operation from a file 'specific' operation to a file
'optional' operation, now that it's possible to detect (with the 'opt_query'
introspection callback) whether a VOL connector implements an optional
operation, without just returning an error.

Added new internal VOL helper routines: H5VL_object_is_native, to determine
if an object is in (or is a) native file, and H5VL_file_is_same, to determine
if two objects are in (or are) the same terminal VOL connector's container.
(And moved the special handling for FILE_IS_EQUAL operation out of internal VOL
callback routine into H5VL_file_is_same)

Made new dataset 'get' operation for H5Dvlen_get_buf_size, aligning it better
with other 'get' operations in API.

Fixed several issues with pass-through connectors, which are now passing the
'make check-passthrough-vol' tests again.

A bunch of warning and style cleanups as well.

3 files changed, 32 insertions, 12 deletions

diff --git a/test/null_vol_connector.c b/test/null_vol_connector.c
index 14e1a38..884bc65 100644
--- a/test/null_vol_connector.c
+++ b/test/null_vol_connector.c
@@ -108,6 +108,10 @@ static const H5VL_class_t null_vol_g = {
         NULL,                                       /* specific     */
         NULL                                        /* optional     */
     },
+    {   /* introspect_cls */
+        NULL,                                       /* get_conn_cls */
+        NULL,                                       /* opt_query    */
+    },
     {   /* request_cls */
         NULL,                                       /* wait         */
         NULL,                                       /* notify       */
diff --git a/test/trefer.c b/test/trefer.c
index b412fc2..04b34eb 100644
--- a/test/trefer.c
+++ b/test/trefer.c
@@ -2516,7 +2516,8 @@ test_reference_perf(void)
         ret = H5Rdestroy(&wbuf[0]);
         CHECK(ret, FAIL, "H5Rdestroy");
     }
-    HDprintf("--- Object reference create time: %lfs\n", t / MAX_ITER_CREATE);
+    if(VERBOSE_MED)
+        HDprintf("--- Object reference create time: %lfs\n", t / MAX_ITER_CREATE);
 
     /* Create reference to dataset */
     ret = H5Rcreate_object(fid1, "/Group1/Dataset1", H5P_DEFAULT, &wbuf[0]);
@@ -2534,7 +2535,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Object reference  write time: %lfs\n", t / MAX_ITER_WRITE);
+    if(VERBOSE_MED)
+        HDprintf("--- Object reference  write time: %lfs\n", t / MAX_ITER_WRITE);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
@@ -2552,7 +2554,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated object reference create time: %lfs\n", t / MAX_ITER_CREATE);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated object reference create time: %lfs\n", t / MAX_ITER_CREATE);
 
     /* Create reference to dataset */
     ret = H5Rcreate(&wbuf_deprec[0], fid1, "/Group1/Dataset1", H5R_OBJECT1, H5I_INVALID_HID);
@@ -2567,7 +2570,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated object reference  write time: %lfs\n", t / MAX_ITER_WRITE);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated object reference  write time: %lfs\n", t / MAX_ITER_WRITE);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
@@ -2588,7 +2592,8 @@ test_reference_perf(void)
         ret = H5Rdestroy(&wbuf_reg[0]);
         CHECK(ret, FAIL, "H5Rdestroy");
     }
-    HDprintf("--- Region reference create time: %lfs\n", t / MAX_ITER_CREATE);
+    if(VERBOSE_MED)
+        HDprintf("--- Region reference create time: %lfs\n", t / MAX_ITER_CREATE);
 
     /* Store first dataset region */
     ret = H5Rcreate_region(fid1, "/Group1/Dataset1", sid1, H5P_DEFAULT, &wbuf_reg[0]);
@@ -2603,7 +2608,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Region reference  write time: %lfs\n", t / MAX_ITER_WRITE);
+    if(VERBOSE_MED)
+        HDprintf("--- Region reference  write time: %lfs\n", t / MAX_ITER_WRITE);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
@@ -2622,7 +2628,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated region reference create time: %lfs\n", t / MAX_ITER_CREATE);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated region reference create time: %lfs\n", t / MAX_ITER_CREATE);
 
     t = 0;
     for(i = 0; i < MAX_ITER_WRITE; i++) {
@@ -2633,7 +2640,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated region reference  write time: %lfs\n", t / MAX_ITER_WRITE);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated region reference  write time: %lfs\n", t / MAX_ITER_WRITE);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
@@ -2666,7 +2674,8 @@ test_reference_perf(void)
         ret = H5Rdestroy(&rbuf[0]);
         CHECK(ret, FAIL, "H5Rdestroy");
     }
-    HDprintf("--- Object reference read time: %lfs\n", t / MAX_ITER_READ);
+    if(VERBOSE_MED)
+        HDprintf("--- Object reference read time: %lfs\n", t / MAX_ITER_READ);
 
     /* Read selection from disk */
     ret = H5Dread(dataset, H5T_STD_REF, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf);
@@ -2711,7 +2720,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated object reference read time: %lfs\n", t / MAX_ITER_READ);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated object reference read time: %lfs\n", t / MAX_ITER_READ);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
@@ -2732,7 +2742,8 @@ test_reference_perf(void)
         ret = H5Rdestroy(&rbuf_reg[0]);
         CHECK(ret, FAIL, "H5Rdestroy");
     }
-    HDprintf("--- Region reference read time: %lfs\n", t / MAX_ITER_READ);
+    if(VERBOSE_MED)
+        HDprintf("--- Region reference read time: %lfs\n", t / MAX_ITER_READ);
 
     /* Read selection from disk */
     ret = H5Dread(dataset, H5T_STD_REF, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf_reg);
@@ -2755,7 +2766,8 @@ test_reference_perf(void)
         t2 = H5_get_time();
         t += t2 - t1;
     }
-    HDprintf("--- Deprecated region reference read time: %lfs\n", t / MAX_ITER_READ);
+    if(VERBOSE_MED)
+        HDprintf("--- Deprecated region reference read time: %lfs\n", t / MAX_ITER_READ);
 
     /* Close Dataset */
     ret = H5Dclose(dataset);
diff --git a/test/vol.c b/test/vol.c
index da42a1e..e7020e7 100644
--- a/test/vol.c
+++ b/test/vol.c
@@ -123,6 +123,10 @@ static const H5VL_class_t fake_vol_g = {
         NULL,                                       /* specific     */
         NULL                                        /* optional     */
     },
+    {   /* introspect_cls */
+        NULL,                                       /* get_conn_cls */
+        NULL,                                       /* opt_query    */
+    },
     {   /* request_cls */
         NULL,                                       /* wait         */
         NULL,                                       /* notify       */