Fix --open-noatime option not working on files

atime of source files could sometimes be overwritten
even though --open-noatime option was used.

To fix that, optional O_NOATIME flag was added
to do_open_nofollow which is also used to open regular
files since fix:
  "fixed symlink race condition in sender"
Previously optional O_NOATIME flag was only in do_open.

syscall.c

@@ -683,6 +683,11 @@ int do_open_nofollow(const char *pathname, int flags)
 #endif
 	}
 
+#ifdef O_NOATIME
+	if (open_noatime)
+		flags |= O_NOATIME;
+#endif
+
 #ifdef O_NOFOLLOW
 	fd = open(pathname, flags|O_NOFOLLOW);
 #else

testsuite/open-noatime.test

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Test rsync --open-noatime option keeps source atimes intact
+
+. "$suitedir/rsync.fns"
+
+$RSYNC -VV | grep '"atimes": true' >/dev/null || test_skipped "Rsync is configured without atimes support"
+
+mkdir "$fromdir"
+
+# --open-noatime did not work properly on files with size > 0
+echo content > "$fromdir/foo"
+touch -a -t 200102031717.42 "$fromdir/foo"
+
+TLS_ARGS=--atimes
+
+"$TOOLDIR/tls" $TLS_ARGS "$fromdir/foo" > "$tmpdir/atime-from-before"
+
+# Do not use checkit because it uses "diff" which breaks atimes
+$RSYNC --open-noatime --archive --recursive --times --atimes -vvv "$fromdir/" "$todir/"
+
+"$TOOLDIR/tls" $TLS_ARGS "$fromdir/foo" > "$tmpdir/atime-from-after"
+diff "$tmpdir/atime-from-before" "$tmpdir/atime-from-after"
+
+# The script would have aborted on error, so getting here means we've won.
+exit 0