diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 3a7b599..9ab5fb1 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1342,6 +1342,14 @@
    :attr:`f_bavail`, :attr:`f_files`, :attr:`f_ffree`, :attr:`f_favail`,
    :attr:`f_flag`, :attr:`f_namemax`.
 
+   Two module-level constants are defined for the :attr:`f_flag` attribute's
+   bit-flags: if :const:`ST_RDONLY` is set, the filesystem is mounted
+   read-only, and if :const:`ST_NOSUID` is set, the semantics of
+   setuid/setgid bits are disabled or not supported.
+
+   .. versionchanged:: 3.2
+      The :const:`ST_RDONLY` and :const:`ST_NOSUID` constants were added.
+
    Availability: Unix.
 
 
diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst
index 1799b70..81cfa83 100644
--- a/Doc/whatsnew/3.2.rst
+++ b/Doc/whatsnew/3.2.rst
@@ -111,6 +111,10 @@
   programmer aware that his code contains object finalization issues.
   (Added by Antoine Pitrou; :issue:`477863`.)
 
+* The :mod:`os` module now has the :const:`ST_RDONLY` and :const:`ST_NOSUID`
+  constants, for use with the :func:`~os.statvfs` function.
+  (Patch by Adam Jackson; :issue:`7647`.)
+
 * The :func:`shutil.copytree` function has two new options:
 
   * *ignore_dangling_symlinks*: when ``symlinks=False`` (meaning that the
diff --git a/Misc/ACKS b/Misc/ACKS
index 4ad93a3..eef51e3 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -389,8 +389,9 @@
 John Interrante
 Bob Ippolito
 Atsuo Ishimoto
-Paul Jackson
+Adam Jackson
 Ben Jackson
+Paul Jackson
 David Jacobs
 Kevin Jacobs
 Kjetil Jacobsen
diff --git a/Misc/NEWS b/Misc/NEWS
index 5b22508..23245a8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -152,6 +152,9 @@
   using the filesystem encoding and surrogateescape error handler. Patch
   written by David Watson.
 
+- Issue #7647: The posix module now has the ST_RDONLY and ST_NOSUID
+  constants, for use with the statvfs() function.  Patch by Adam Jackson.
+
 - Issue #8688: MANIFEST files created by distutils now include a magic
   comment indicating they are generated.  Manually maintained MANIFESTs
   without this marker will not be overwritten or removed.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index c36f7b4..ce625b4 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -8169,6 +8169,14 @@
     if (ins(d, "EX_NOTFOUND", (long)EX_NOTFOUND)) return -1;
 #endif /* EX_NOTFOUND */
 
+	/* statvfs */
+#ifdef ST_RDONLY
+	if (ins(d, "ST_RDONLY", (long)ST_RDONLY)) return -1;
+#endif /* ST_RDONLY */
+#ifdef ST_NOSUID
+	if (ins(d, "ST_NOSUID", (long)ST_NOSUID)) return -1;
+#endif /* ST_NOSUID */
+
 #ifdef HAVE_SPAWNV
 #if defined(PYOS_OS2) && defined(PYCC_GCC)
     if (ins(d, "P_WAIT", (long)P_WAIT)) return -1;