Alex Shnitman wrote:
>
> Hi, Ariel!
>
> On Wed, Feb 02, 2000 at 07:06:14PM +0200, you wrote the following:
>
> > You cannot mount a directory over another. You can mount a device over an
> > already mounted device (called supermount).
> >
> > For example, if you have /dev/hda1 mounted on / , you can mount /dev/hda2
> > on /var.
>
> A nice thing that BSD has and Linux doesn't (AFAIK, anyway) is
> union_mount, which allows you to mount a device on a direcory,
> *retaining* the entries of the directory and just adding the entries
> from the filesystem on the device. That should be really neat
> (although I've never tried it). Also, I think I read sometime in
> Kernel Traffic that someone was to implement that for Linux; does
> anyone know what's the status of that?
Once upon a time, there was a thing called IFS (Incremental File System)
for Linux, which did just that. It was meant for mounting a hard disk
partition "over" a CD-ROM, so that you could "write" to the CD-ROM. This
way, you didn't have to copy over the whole CD if you wanted to make
changes.
However, this drivers seems to have died quite a while ago...
Gavrie.
--
Gavrie Philipson
Netmor Applied Modeling Research Ltd.
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