> Chad Miller <cmiller@surfsouth.com> writes:
>
> > On Wed, Nov 17, 1999 at 09:26:41PM +0000, Riley Williams wrote:
> > > Basically, one facility I could use is that of being able to mount two
> > > or more partitions on top of each other and have all the files from
> > > all of the partitions available for reading. This is what I call a
> > > transparent mount.
> >
> > It sounds a lot like (BSD's?) union mount.
>
> It is also similar to the experimental BSD vpath. There is a paper somewhere on
> this. Vpaths were stored in the kernel per-user as a stack. They then worked
> rather like the makefile VPATH directive, indeed this is probably what inspired
> it.
>
> A per-user vpath affected namei lookups. Apparently the kernel mods required
> were small.
We have completely different VFS architecture in namespace-related parts.
4.4 doesn't have dcache, so...
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