Comment # 30 on bug 902612 from Per Jessen

(In reply to Dr. Werner Fink from comment #29)
> Hmmm .. IMHO there should exactly *one* /etc/fstab and all tools including
> systemd have to use *exactly* this one.
> 
> IMHO it should be possible for a system admin to stop udevd service before
> perform surgery on the open hard aka the active device.  AFAIK there is a
> control option within the man:udevadm(8) which includes -s/-S (or
> --stop-exec-queue/--start-exec-queue).
> 
> IMHO a System Adminstratos should be able to do
> 
>        umount /mnt/local
>        udevadm control --stop-exec-queue
>        lvchange -an vg0/local
>        lvchange -ay vg0/local
>        [...]
>        udevadm control --start-exec-queue
> 
> ... this should solve the problem, that is udevd will still queue events but
> not handle them.  IMHO this should avoid the automatic mount.

I guess it would, but having to add an extra step instead of just the single
"umount", is destined for disaster.  People have to be able to rely on "umount"
causing the device to be unmounted and remain unmounted. IMNSHO.  Imagine if
the behaviour of "rm" was changed in the same way?