[eureka]

And here is a basic upstart script for mounting/unmounting filesystem (described earlier):

start on started system and started syslog
stop on stopping filesystems

pre-start script
  source /etc/upstart/functions

  losetup -o 1075838976 /dev/loop/1 /dev/mmcblk0p4
  mount -t ext3 /dev/loop/1 /mnt/newpart
  
  f_log I newpart mount "newpart is mounted"
end script

post-stop script
  source /etc/upstart/functions

  umount /mnt/newpart
  losetup -d /dev/loop/1
  
  f_log I newpart umount "newpart is unmounted"
end script

It's really basic, if you'll use it as-is, expect some (rare?) ignored edge cases (can't imagine any example right now, though).