ken@titan ~/tmp/pm_11143050
$ ./mapfs.pl
IGNORED '/home/ken/tmp/pm_11143050/fs/a/a_named_pipe': not a plain file, link or directory.
{
  "/fs/a"       => ["dir", ["/fs/a/b", "/fs/a/u"]],
  "/fs/a/b"     => ["dir", ["/fs/a/b/c", "/fs/a/b/v"]],
  "/fs/a/b/c"   => ["dir", ["/fs/a/b/c/w"]],
  "/fs/a/b/c/f" => ["file", []],
  "/fs/a/b/c/p" => ["link", ["/fs/a/b/c"]],
  "/fs/a/b/c/w" => ["dir", []],
  "/fs/a/b/c/z" => ["link", ["/fs/a"]],
  "/fs/a/b/e"   => ["file", []],
  "/fs/a/b/q"   => ["link", ["/fs/a/b"]],
  "/fs/a/b/v"   => ["dir", []],
  "/fs/a/b/y"   => ["link", ["/fs/a/b"]],
  "/fs/a/d"     => ["file", []],
  "/fs/a/r"     => ["link", ["/fs/a"]],
  "/fs/a/u"     => ["dir", []],
  "/fs/a/x"     => ["link", ["/fs/a/b/c"]],
  "/fs/t"       => ["dir", []],
}