commit f49a26e7 upstream.

Update ctime and mtime when a directory is modified. (though OS/2 doesn't
update them anyway)
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>