On Sun, 25 Jun 2000, Richard Gooch wrote:
> Hi, Al. Recent kernels have a problem with unmounting via the device
> file. If I do:
>
> # mknod /mydev b ...
> # mount -n /mydev /mnt
> # /tmp/kumount /mydev
> Error unmounting: /mydev Invalid argument
>
> This used to work. Note that kumount only does a call to umount(2).
Shot with explicit permission from Linus. It was an ancient rudiment of
v7->Minix->Linux 0.10 lineage and had been replaced by better mechanism in
0.9<something>. It makes no sense for NFS or any other non-block fs,
it's makes no sense if you may have multiple mounts; other Unices had
dropped it since long. Since umount(8) did not use it since _very_ long...
Do it by the mountpoint.
