> > > As for unlink... How do you deal with having that thing
> > > mounted, mounting something _under_ it (so that vfsmount would be kept
> > > busy) and then unlinking that sucker?
> >
> > Yeah, that's a good point. Current patch doesn't deal with that.
> > Simplest solution could be to disallow submounting these. Don't think
> > it makes much sense anyway.
> >
>
> Hmm, think about /your/path/qemu-disk1.img/boot ,
> /your/path/qemu-disk2.img/usr , ...
I get it.
It could probably be done with a little added complexity. For example
when a real mount is attached onto a dir-on-file mount, the
"mountedness" is propagated up to the dentry on the next real mount.
So in that case unlink won't be allowed, even if the immediate
attachment is a dir-on-file mount.
This is tricky to do right though.
Other possibility is to detach all mount trees attached to dentry on
unlink.
Miklos
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