Preserve MPI-I/O file hints when fapl is closed (#3755)

* Fix for issue #3025: Save the MPI info in the file struct so H5Fget_access_plist() can retrieve it from there.

2 files changed, 19 insertions, 5 deletions

diff --git a/src/H5Fint.c b/src/H5Fint.c
index 4093b4b..439fa4f 100644
--- a/src/H5Fint.c
+++ b/src/H5Fint.c
@@ -402,7 +402,6 @@ H5F_get_access_plist(H5F_t *f, bool app_ref)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set collective metadata read flag");
     if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI)) {
         MPI_Comm mpi_comm;
-        MPI_Info mpi_info;
 
         /* Retrieve and set MPI communicator */
         if (MPI_COMM_NULL == (mpi_comm = H5F_mpi_get_comm(f)))
@@ -410,10 +409,8 @@ H5F_get_access_plist(H5F_t *f, bool app_ref)
         if (H5P_set(new_plist, H5F_ACS_MPI_PARAMS_COMM_NAME, &mpi_comm) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set MPI communicator");
 
-        /* Retrieve and set MPI info object */
-        if (H5P_get(old_plist, H5F_ACS_MPI_PARAMS_INFO_NAME, &mpi_info) < 0)
-            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, H5I_INVALID_HID, "can't get MPI info object");
-        if (H5P_set(new_plist, H5F_ACS_MPI_PARAMS_INFO_NAME, &mpi_info) < 0)
+        /* Retrieve MPI info object */
+        if (H5P_set(new_plist, H5F_ACS_MPI_PARAMS_INFO_NAME, &(f->shared->mpi_info)) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set MPI info object");
     }
 #endif /* H5_HAVE_PARALLEL */
@@ -1133,6 +1130,12 @@ H5F__new(H5F_shared_t *shared, unsigned flags, hid_t fcpl_id, hid_t fapl_id, H5F
         /* initialize point of no return */
         f->shared->point_of_no_return = false;
 
+#ifdef H5_HAVE_PARALLEL
+        /* Initialize this just in case we fail before setting this field and */
+        /* we try to call H5_mpi_info_free() on uninitialized memory in H5F__dest() */
+        f->shared->mpi_info = MPI_INFO_NULL;
+#endif /* H5_HAVE_PARALLEL */
+
         /* Copy the file creation and file access property lists into the
          * new file handle. We do this early because some values might need
          * to change as the file is being opened.
@@ -1209,6 +1212,8 @@ H5F__new(H5F_shared_t *shared, unsigned flags, hid_t fcpl_id, hid_t fapl_id, H5F
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get collective metadata read flag");
         if (H5P_get(plist, H5F_ACS_COLL_MD_WRITE_FLAG_NAME, &(f->shared->coll_md_write)) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get collective metadata write flag");
+        if (H5P_get(plist, H5F_ACS_MPI_PARAMS_INFO_NAME, &(f->shared->mpi_info)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't set MPI info object");
 #endif /* H5_HAVE_PARALLEL */
         if (H5P_get(plist, H5F_ACS_META_CACHE_INIT_IMAGE_CONFIG_NAME, &(f->shared->mdc_initCacheImageCfg)) <
             0)
@@ -1414,6 +1419,14 @@ H5F__dest(H5F_t *f, bool flush, bool free_on_failure)
             f->shared->efc = NULL;
         } /* end if */
 
+#ifdef H5_HAVE_PARALLEL
+        if (f->shared->mpi_info != MPI_INFO_NULL) {
+            /* Free MPI info saved in the file struct */
+            if (H5_mpi_info_free(&f->shared->mpi_info) < 0)
+                HDONE_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "can't free MPI info");
+        }
+#endif
+
         /* With the shutdown modifications, the contents of the metadata cache
          * should be clean at this point, with the possible exception of the
          * the superblock and superblock extension.
diff --git a/src/H5Fpkg.h b/src/H5Fpkg.h
index bc5c90b..e81b250 100644
--- a/src/H5Fpkg.h
+++ b/src/H5Fpkg.h
@@ -359,6 +359,7 @@ struct H5F_shared_t {
 #ifdef H5_HAVE_PARALLEL
     H5P_coll_md_read_flag_t coll_md_read;  /* Do all metadata reads collectively */
     bool                    coll_md_write; /* Do all metadata writes collectively */
+    MPI_Info                mpi_info;      /* MPI info */
 #endif                                     /* H5_HAVE_PARALLEL */
 };