Re: RFC: permit link(2) to work across --bind mounts ?

[Jan Engelhardt <jengelh@computergmbh.de>]

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.
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