On Sat, 29 Dec 2007, Jan Engelhardt wrote:
>
> On Dec 28 2007 18:53, dean gaudet wrote:
> >p.s. in retrospect i probably could have arranged it more like this:
> >
> > mount /dev/md1 $tmpmntpoint
> > mount --bind $tmpmntpoint/var /var
> > mount --bind $tmpmntpoint/home /home
> > umount $tmpmntpoint
> >
> >except i can't easily specify that in fstab... and neither of the bind
> >mounts would show up in df(1). seems like it wouldn't be hard to support
> >this type of subtree mount though. mount(8) could support a single
> >subtree mount using this technique but the second subtree mount attempt
> >would fail because you can't temporarily remount the device because the
> >mount point is gone.
>
> Why is it gone?
>
> mount /dev/md1 /tmpmnt
> mount --bind /tmpmnt/var /var
> mount --bind /tmpmnt/home /home
>
> Is perfectly fine, and /tmpmnt is still alive and mounted. Additionally,
> you can
>
> umount /tmpmnt
>
> now, which leaves only /var and /home.
i was trying to come up with a userland-only change in mount(8) which
would behave like so:
# mount --subtree var /dev/md1 /var
internally mount does:
- mount /dev/md1 /tmpmnt
- mount --bind /tmpmnt/var /var
- umount /tmpmnt
# mount --subtree home /dev/md1 /home
internally mount does:
- mount /dev/md1 /tmpmnt
- mount --bind /tmpmnt/home /home
- umount /tmpmnt
but that second mount would fail because /dev/md1 is already mounted
(but the mount point is gone)...
it certainly works if i issue the commands individually as i described
-- but a change within mount(8) would have the benefit of working with
/etc/fstab too.
-dean
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