Merge pull request #3130 from artpol84/dstore_fix/v2.x

opal/pmix: Bring dstore fixes for rc3 testing

Author: jsquyres

opal/mca/pmix/pmix112/README

@@ -6,10 +6,12 @@ Additional copyrights may follow
 $HEADER$
 
 ===========================================================================
-This internal component includes PMIx v1.2.1 plus these two commits
+This internal component includes PMIx v1.2.1 plus following commits
 cherry-picked from the PMIx v1.2 branch (which will be included in the
 eventual PMIx v1.2.2 release). Newer patches at top.
 
+ * https://github.com/pmix/pmix/commit/1b86a6e7ee99fc5969a0789a9905a4a2159a6dc0
+ * https://github.com/pmix/pmix/commit/14f865c4b631827fb99779d42eaf0567f117a76f
  * https://github.com/pmix/pmix/commit/4269e8484bd883523ae485bf2e1b7bbc0719c494
  * https://github.com/pmix/pmix/commit/a2d431cbec162b01e15920cc75df1af9ad244f06
  * https://github.com/pmix/pmix/commit/8587f278a17301633ccf6f0d7cb086e3be8f4793

opal/mca/pmix/pmix112/pmix/src/sm/pmix_mmap.c

@@ -64,24 +64,38 @@ int _mmap_segment_create(pmix_sm_seg_t *sm_seg, const char *file_name, size_t si
     }
     /* size backing file - note the use of real_size here */
 #ifdef HAVE_POSIX_FALLOCATE
-    if (0 != posix_fallocate(sm_seg->seg_id, 0, size)) {
+    if (0 != (rc = posix_fallocate(sm_seg->seg_id, 0, size))) {
         pmix_output_verbose(2, pmix_globals.debug_output,
                 "sys call posix_fallocate(2) fail\n");
-        if (ENOSPC == errno) {
+        if (ENOSPC == rc) {
             rc = PMIX_ERR_OUT_OF_RESOURCE;
-        } else {
+            goto out;
+        } else if ((ENOTSUP != rc)
+#ifdef EOPNOTSUPP
+                            && (EOPNOTSUPP != rc)
+#endif
+        ){
             rc = PMIX_ERROR;
+            goto out;
         }
-        goto out;
+        /* else:
+         * Not supported by OS and/or filesystem.
+         * Must fall-back to ftruncate().
+         */
+    } else {
+        goto map_memory;
     }
-#else
+#endif
     if (0 != ftruncate(sm_seg->seg_id, size)) {
         pmix_output_verbose(2, pmix_globals.debug_output,
                 "sys call ftruncate(2) fail\n");
         rc = PMIX_ERROR;
         goto out;
+    } else {
+        rc = PMIX_SUCCESS;
     }
-#endif
+
+map_memory:
     if (MAP_FAILED == (seg_addr = mmap(NULL, size,
                                        PROT_READ | PROT_WRITE, MAP_SHARED,
                                        sm_seg->seg_id, 0))) {