mpi/c: Protect some IO functions not widely implemented

* Protects us from segv when ROMIO 314 is selected and one of the
   following operations is called:
   - MPI_File_iread_at_all
   - MPI_File_iwrite_at_all
   - MPI_File_iread_all
   - MPI_File_iwrite_all

Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>

ompi/mpi/c/file_iread_all.c

@@ -13,6 +13,7 @@
  * Copyright (c) 2015      University of Houston.  All rights reserved.
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -71,8 +72,13 @@ int MPI_File_iread_all(MPI_File fh, void *buf, int count,
     /* Call the back-end io component function */
     switch (fh->f_io_version) {
     case MCA_IO_BASE_V_2_0_0:
+        if( OPAL_UNLIKELY(NULL == fh->f_io_selected_module.v2_0_0.io_module_file_iread_all) ) {
+            rc = MPI_ERR_UNSUPPORTED_OPERATION;
+        }
+        else {
             rc = fh->f_io_selected_module.v2_0_0.
                 io_module_file_iread_all(fh, buf, count, datatype, request);
+        }
         break;
 
     default:

ompi/mpi/c/file_iread_at_all.c

@@ -13,6 +13,7 @@
  * Copyright (c) 2015      University of Houston.  All rights reserved.
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -71,9 +72,14 @@ int MPI_File_iread_at_all(MPI_File fh, MPI_Offset offset, void *buf,
     /* Call the back-end io component function */
     switch (fh->f_io_version) {
     case MCA_IO_BASE_V_2_0_0:
+        if( OPAL_UNLIKELY(NULL == fh->f_io_selected_module.v2_0_0.io_module_file_iread_at_all) ) {
+            rc = MPI_ERR_UNSUPPORTED_OPERATION;
+        }
+        else {
             rc = fh->f_io_selected_module.v2_0_0.
                 io_module_file_iread_at_all(fh, offset, buf, count, datatype,
                                             request);
+        }
         break;
 
     default:

ompi/mpi/c/file_iwrite_all.c

@@ -16,6 +16,7 @@
  * Copyright (c) 2015      University of Houston.  All rights reserved.
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -75,8 +76,13 @@ int MPI_File_iwrite_all(MPI_File fh, const void *buf, int count, MPI_Datatype
     /* Call the back-end io component function */
     switch (fh->f_io_version) {
     case MCA_IO_BASE_V_2_0_0:
+        if( OPAL_UNLIKELY(NULL == fh->f_io_selected_module.v2_0_0.io_module_file_iwrite_all) ) {
+            rc = MPI_ERR_UNSUPPORTED_OPERATION;
+        }
+        else {
             rc = fh->f_io_selected_module.v2_0_0.
                 io_module_file_iwrite_all(fh, buf, count, datatype, request);
+        }
         break;
 
     default:

ompi/mpi/c/file_iwrite_at_all.c

@@ -16,6 +16,7 @@
  * Copyright (c) 2015      University of Houston.  All rights reserved.
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -76,9 +77,14 @@ int MPI_File_iwrite_at_all(MPI_File fh, MPI_Offset offset, const void *buf,
     /* Call the back-end io component function */
     switch (fh->f_io_version) {
     case MCA_IO_BASE_V_2_0_0:
+        if( OPAL_UNLIKELY(NULL == fh->f_io_selected_module.v2_0_0.io_module_file_iwrite_at_all) ) {
+            rc = MPI_ERR_UNSUPPORTED_OPERATION;
+        }
+        else {
             rc = fh->f_io_selected_module.v2_0_0.
                 io_module_file_iwrite_at_all(fh, offset, buf, count, datatype,
                                              request);
+        }
         break;
 
     default: