Re: FUSE merging?

[Frank van Maarseveen]

On Fri, Jul 01, 2005 at 03:21:59PM +0200, Miklos Szeredi wrote:
> 
> > To require an empty stub to mount FUSE upon makes the whole picture
> > cleaner: users are only able to extend the namespace _leaf_ nodes for
> > themselves and processes they can send signals to: setuid programs
> > which do not fully become root. The existing namespace [nodes] remains
> > unchanged for everyone.
> 
> It's not as simple.  A filesystem can be mounted many times (either
> with mount --bind, or just by mounting the same device on multiple
> mountpoints).  In this case you can't ensure, that a mountpoint will
> remain a leaf node after being mounted on.

I have bind-mounted / on /net/blabla
I tried two experiments:

	mounting something under / and looking for it under /net/blabla
	mounting something under /net/blabla and looking for it under /

The experiment was done with bind mounts and by mounting a USB stick
(/dev/sdb1) and there was no auto propagation of mounts.

(2.6.12-rc6)

How can a leaf dir suddenly become non-leaf by a mount without an explicit
mount command?

-- 
Frank
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