Rework MPI Info FAPL preserve PR to use VFD 'ctl' operations

src/H5FDmpi.c

@@ -104,13 +104,12 @@ H5FD_mpi_get_size(H5FD_t *file)
 } /* end H5FD_mpi_get_size() */
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpi_get_comm
+ * Function:    H5FD_mpi_get_comm
  *
- * Purpose:	Retrieves the file's communicator
+ * Purpose:	    Retrieves the file's MPI_Comm communicator object
  *
- * Return:	Success:	The communicator (non-negative)
- *
- *		Failure:	Negative
+ * Return:      Success:    The communicator object
+ *              Failure:    MPI_COMM_NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -143,6 +142,45 @@ H5FD_mpi_get_comm(H5FD_t *file)
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5FD_mpi_get_comm() */
 
+/*-------------------------------------------------------------------------
+ * Function:    H5FD_mpi_get_comm
+ *
+ * Purpose:     Retrieves the file's MPI_Info info object
+ *
+ * Return:      Success:    The info object
+ *              Failure:    MPI_INFO_NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+MPI_Info
+H5FD_mpi_get_info(H5FD_t *file)
+{
+    const H5FD_class_t *cls;
+    uint64_t            flags    = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG | H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;
+    MPI_Info            info     = MPI_INFO_NULL;
+    void               *info_ptr = (void *)(&info);
+    MPI_Info            ret_value;
+
+    FUNC_ENTER_NOAPI(MPI_INFO_NULL)
+
+    assert(file);
+    cls = (const H5FD_class_t *)(file->cls);
+    assert(cls);
+    assert(cls->ctl); /* All MPI drivers must implement this */
+
+    /* Dispatch to driver */
+    if ((cls->ctl)(file, H5FD_CTL_GET_MPI_INFO_OPCODE, flags, NULL, &info_ptr) < 0)
+        HGOTO_ERROR(H5E_VFL, H5E_CANTGET, MPI_INFO_NULL, "driver get_info request failed");
+
+    if (info == MPI_INFO_NULL)
+        HGOTO_ERROR(H5E_VFL, H5E_CANTGET, MPI_INFO_NULL, "driver get_info request failed -- bad info object");
+
+    ret_value = info;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5FD_mpi_get_info() */
+
 /*-------------------------------------------------------------------------
  * Function:    H5FD_mpi_MPIOff_to_haddr
  *

src/H5FDmpio.c

@@ -3795,6 +3795,7 @@ H5FD__mpio_delete(const char *filename, hid_t fapl_id)
  *              At present, the supported op codes are:
  *
  *                  H5FD_CTL_GET_MPI_COMMUNICATOR_OPCODE
+ *                  H5FD_CTL_GET_MPI_INFO_OPCODE
  *                  H5FD_CTL_GET_MPI_RANK_OPCODE
  *                  H5FD_CTL_GET_MPI_SIZE_OPCODE
  *                  H5FD_CTL_GET_MPI_FILE_SYNC_OPCODE
@@ -3827,6 +3828,12 @@ H5FD__mpio_ctl(H5FD_t *_file, uint64_t op_code, uint64_t flags, const void H5_AT
             **((MPI_Comm **)output) = file->comm;
             break;
 
+        case H5FD_CTL_GET_MPI_INFO_OPCODE:
+            assert(output);
+            assert(*output);
+            **((MPI_Info **)output) = file->info;
+            break;
+
         case H5FD_CTL_GET_MPI_RANK_OPCODE:
             assert(output);
             assert(*output);

src/H5FDprivate.h

@@ -214,6 +214,7 @@ H5_DLL herr_t H5FD_get_mpio_atomicity(H5FD_t *file, bool *flag);
 H5_DLL int      H5FD_mpi_get_rank(H5FD_t *file);
 H5_DLL int      H5FD_mpi_get_size(H5FD_t *file);
 H5_DLL MPI_Comm H5FD_mpi_get_comm(H5FD_t *file);
+H5_DLL MPI_Info H5FD_mpi_get_info(H5FD_t *file);
 H5_DLL herr_t   H5FD_mpi_get_file_sync_required(H5FD_t *file, bool *file_sync_required);
 #endif /* H5_HAVE_PARALLEL */
 

src/H5FDpublic.h

@@ -179,6 +179,7 @@
 #define H5FD_CTL_INVALID_OPCODE              0
 #define H5FD_CTL_TEST_OPCODE                 1
 #define H5FD_CTL_GET_MPI_COMMUNICATOR_OPCODE 2
+#define H5FD_CTL_GET_MPI_INFO_OPCODE         9
 #define H5FD_CTL_GET_MPI_RANK_OPCODE         3
 #define H5FD_CTL_GET_MPI_SIZE_OPCODE         4
 #define H5FD_CTL_MEM_ALLOC                   5

src/H5FDsubfiling/H5FDsubfiling.c

@@ -2551,6 +2551,12 @@ H5FD__subfiling_ctl(H5FD_t *_file, uint64_t op_code, uint64_t flags, const void
             **((MPI_Comm **)output) = file->ext_comm;
             break;
 
+        case H5FD_CTL_GET_MPI_INFO_OPCODE:
+            assert(output);
+            assert(*output);
+            **((MPI_Info **)output) = file->info;
+            break;
+
         case H5FD_CTL_GET_MPI_RANK_OPCODE:
             assert(output);
             assert(*output);

src/H5Fint.c

@@ -402,16 +402,19 @@ 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)))
             HGOTO_ERROR(H5E_FILE, H5E_CANTGET, H5I_INVALID_HID, "can't get MPI communicator");
         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 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");
+        /* Retrieve and set MPI info */
+        if (MPI_INFO_NULL == (mpi_info = H5F_mpi_get_info(f)))
+            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, H5I_INVALID_HID, "can't get MPI info");
+        if (H5P_set(new_plist, H5F_ACS_MPI_PARAMS_INFO_NAME, &mpi_info) < 0)
+            HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set MPI info");
     }
 #endif /* H5_HAVE_PARALLEL */
     if (H5P_set(new_plist, H5F_ACS_META_CACHE_INIT_IMAGE_CONFIG_NAME, &(f->shared->mdc_initCacheImageCfg)) <
@@ -1130,12 +1133,6 @@ 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.
@@ -1212,8 +1209,6 @@ 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)
@@ -1419,14 +1414,6 @@ 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.

src/H5Fmpi.c

@@ -97,11 +97,10 @@ H5F_mpi_get_rank(const H5F_t *f)
 /*-------------------------------------------------------------------------
  * Function:    H5F_mpi_get_comm
  *
- * Purpose:     Retrieves the file's communicator
+ * Purpose:     Retrieves the file's MPI_Comm communicator object
  *
- * Return:      Success:    The communicator (non-negative)
- *
- *              Failure:    Negative
+ * Return:      Success:    The communicator object
+ *              Failure:    MPI_COMM_NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -122,6 +121,33 @@ H5F_mpi_get_comm(const H5F_t *f)
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5F_mpi_get_comm() */
 
+/*-------------------------------------------------------------------------
+ * Function:    H5F_mpi_get_info
+ *
+ * Purpose:     Retrieves the file's MPI_Info info object
+ *
+ * Return:      Success:    The info object
+ *              Failure:    MPI_INFO_NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+MPI_Info
+H5F_mpi_get_info(const H5F_t *f)
+{
+    MPI_Info ret_value = MPI_INFO_NULL;
+
+    FUNC_ENTER_NOAPI(MPI_INFO_NULL)
+
+    assert(f && f->shared);
+
+    /* Dispatch to driver */
+    if ((ret_value = H5FD_mpi_get_info(f->shared->lf)) == MPI_INFO_NULL)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, MPI_INFO_NULL, "driver get_info request failed");
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5F_mpi_get_info() */
+
 /*-------------------------------------------------------------------------
  * Function:    H5F_shared_mpi_get_size
  *

src/H5Fpkg.h

@@ -359,7 +359,6 @@ 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 */
 };
 

src/H5Fprivate.h

@@ -640,6 +640,7 @@ H5_DLL herr_t H5F_eoa_dirty(H5F_t *f);
 #ifdef H5_HAVE_PARALLEL
 H5_DLL int      H5F_mpi_get_rank(const H5F_t *f);
 H5_DLL MPI_Comm H5F_mpi_get_comm(const H5F_t *f);
+H5_DLL MPI_Info H5F_mpi_get_info(const H5F_t *f);
 H5_DLL int      H5F_shared_mpi_get_size(const H5F_shared_t *f_sh);
 H5_DLL int      H5F_mpi_get_size(const H5F_t *f);
 H5_DLL herr_t   H5F_mpi_retrieve_comm(hid_t loc_id, hid_t acspl_id, MPI_Comm *mpi_comm);