-# Prefix for scratch directory. We create separate directories for
-# each test case, so that they can be left behind in case of failure
-# to aid investigation.
+# Directory that holds the other test subdirs. We create separate dirs
+# inside for each test case, so that they can be left behind in case of
+# failure to aid investigation. We don't remove the testtmp subdir at
+# the end so that it can be configured as a symlink to a filesystem that
+# has ACLs and xattr support enabled (if desired).