pg_upgrade: remove pre-8.4 code and >= 8.4 check

We only support upgrading from >= 8.4 so no need for this code or tests.

Reported-by: Magnus Hagander

Discussion: https://postgr.es/m/CABUevEx-D0PNVe00tkeQRGennZQwDtBJn=493MJt-x6sppbUxA@mail.gmail.com

Backpatch-through: 9.5

src/bin/pg_upgrade/check.c

@@ -234,18 +234,10 @@ void
 output_completion_banner(char *analyze_script_file_name,
 						 char *deletion_script_file_name)
 {
-	/* Did we copy the free space files? */
-	if (GET_MAJOR_VERSION(old_cluster.major_version) >= 804)
-		pg_log(PG_REPORT,
-			   "Optimizer statistics are not transferred by pg_upgrade so,\n"
-			   "once you start the new server, consider running:\n"
-			   "    %s\n\n", analyze_script_file_name);
-	else
-		pg_log(PG_REPORT,
-			   "Optimizer statistics and free space information are not transferred\n"
-			   "by pg_upgrade so, once you start the new server, consider running:\n"
-			   "    %s\n\n", analyze_script_file_name);
-
+	pg_log(PG_REPORT,
+		   "Optimizer statistics are not transferred by pg_upgrade so,\n"
+		   "once you start the new server, consider running:\n"
+		   "    %s\n\n", analyze_script_file_name);
 
 	if (deletion_script_file_name)
 		pg_log(PG_REPORT,
@@ -275,7 +267,7 @@ check_cluster_versions(void)
 	 * upgrades
 	 */
 
-	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 803)
+	if (GET_MAJOR_VERSION(old_cluster.major_version) < 804)
 		pg_fatal("This utility can only upgrade from PostgreSQL version 8.4 and later.\n");
 
 	/* Only current PG version is supported as a target */
@@ -510,19 +502,12 @@ create_script_for_cluster_analyze(char **analyze_script_file_name)
 			ECHO_QUOTE, ECHO_QUOTE);
 	fprintf(script, "echo %sthis script and run:%s\n",
 			ECHO_QUOTE, ECHO_QUOTE);
-	fprintf(script, "echo %s    \"%s/vacuumdb\" %s--all %s%s\n", ECHO_QUOTE,
-			new_cluster.bindir, user_specification.data,
-	/* Did we copy the free space files? */
-			(GET_MAJOR_VERSION(old_cluster.major_version) >= 804) ?
-			"--analyze-only" : "--analyze", ECHO_QUOTE);
+	fprintf(script, "echo %s    \"%s/vacuumdb\" %s--all --analyze-only%s\n", ECHO_QUOTE,
+			new_cluster.bindir, user_specification.data, ECHO_QUOTE);
 	fprintf(script, "echo%s\n\n", ECHO_BLANK);
 
 	fprintf(script, "\"%s/vacuumdb\" %s--all --analyze-in-stages\n",
 			new_cluster.bindir, user_specification.data);
-	/* Did we copy the free space files? */
-	if (GET_MAJOR_VERSION(old_cluster.major_version) <= 803)
-		fprintf(script, "\"%s/vacuumdb\" %s--all\n", new_cluster.bindir,
-				user_specification.data);
 
 	fprintf(script, "echo%s\n\n", ECHO_BLANK);
 	fprintf(script, "echo %sDone%s\n",

src/bin/pg_upgrade/relfilenode.c

@@ -163,16 +163,12 @@ transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
 			/* transfer primary file */
 			transfer_relfile(&maps[mapnum], "", vm_must_add_frozenbit);
 
-			/* fsm/vm files added in PG 8.4 */
-			if (GET_MAJOR_VERSION(old_cluster.major_version) >= 804)
-			{
-				/*
-				 * Copy/link any fsm and vm files, if they exist
-				 */
-				transfer_relfile(&maps[mapnum], "_fsm", vm_must_add_frozenbit);
-				if (vm_crashsafe_match)
-					transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
-			}
+			/*
+			 * Copy/link any fsm and vm files, if they exist
+			 */
+			transfer_relfile(&maps[mapnum], "_fsm", vm_must_add_frozenbit);
+			if (vm_crashsafe_match)
+				transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
 		}
 	}
 }