Thanks pali for referring to original files.

If I'm reading this correctly the new method does no longer regenerate the mount-opts file during boot, while the old method regenerated this file at every boot? (Before the mount-opts-overwrite files was used for user specific options, but with new method this is no longer needed due to mount-opts not being overwritten no more?)

Can someone with latest CSSU and normally working N900 post the /etc/default/mount-opts file contents here for comparison?

Especially I'm wondering what the fmask value should be... I have seen either 0133 or 000 being used... Which one is correct for MyDocs?