mount user option

[ibotty]

i want to be the first one to correct me ;)

my explanation is wrong:
> regarding 1), mount will set the euid to the uid, if no user option is
> given in /etc/fstab. so the suid-bit is only set, when mounting with
> 'user'.

this is done only in mountfs.
the informative uses of mount still run with euid == 0, but it is trivial to
do so with other parts of the code. i just cannot see, why this should be
neccessary.

~ibotty