[1640] in RedHat Linux List
Re: redhat-digest Digest V96 #414
daemon@ATHENA.MIT.EDU (Mike Sangrey)
Tue Oct 29 12:54:11 1996
To: Randy Schrickel <randy.schrickel@raba.com>
cc: redhat-list@redhat.com
In-reply-to: Your message of "Tue, 29 Oct 1996 09:29:07 EST."
<327614B3.446B@raba.com>
Date: Tue, 29 Oct 1996 11:26:13 -0500
From: Mike Sangrey <mike@sojurn.lns.pa.us>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Randy Schrickel wrote:
> > Mike Sangrey wrote:
> > > Actually, they're not gone. They're just...sorta...underneath.
> > >You need to create another directory, "/home1", maybe. That will be
> > > what's called a "mount point". See your /etc/fstab for examples of
> > >"mount points." Then you can mount "/dev/hda3 on /home1.
> > >
> > > By way of explanation: there exists on Suns a _transparent_ filesystem.
>
> Huh? Never heard it called that before. It's actually a "feature" of the
> mount command (some might call it a bug; I think this topic has been
> discussed here before). IMHO, a feature that should be used with caution
> due to the confusion it can cause.
I wasn't clear enough. I was trying to explain what the problem was by using
a contrasting filesystem type. Sun does have what I believe they call a
_transparent_ filesystem. I also believe this has been implemented on Linux,
but I don't know where you can get it. It is NOT typically available nor used.
>
> > >Picture this: you mount your CDROM on the mount point "/mnt/cdrom".
> > > You then mount /dev/hda3 as a transparent filesystem on top of
> > > "/mnt/cdrom". A transparent filesystem differs from a regular
> > >filesystem in that the underlying filesystem "shines through", much
>
> I'd call that a "opaque" filesystem, because you *can't* see what's
> underneath. The later mount hides what is on the first mount. This is
> exactly Jamal's problem.
>
You misunderstand me. A transparent filesystem, by design and implementation,
is such that you _can_ see through it. That's why it was created. In typical
filesystems, as you point out, you can't see through them. They're opaque as
you say. The transparent filesystem is not like that. Again, I was using
contrast to clarify. Apparently, I failed.
I agree with you whole heartedly regarding the use of mounting an ordinary
filesystem over top of another. I see no use for it and see it only causing
confusion.
--
Mike Sangrey <mike@sojurn.lns.pa.us> (Home)
<Mike.Sangrey@specmarkmet.com>(Work)
"I've trademarked `William Della Croce, Jr.(tm)'.
Anyone using this name owes me $1,000,000."
--
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