Date: Thu, 5 Sep 2002 16:49:51 +0200 From: Roman Neuhauser <neuhauser@bellavista.cz> To: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com> Cc: freebsd-questions@freebsd.org Subject: Re: mount(8) mount_union(8) and the slippery wet floor... Message-ID: <20020905144950.GM10717@freepuppy.bellavista.cz> In-Reply-To: <20020905144627.GL10717@freepuppy.bellavista.cz> References: <5.1.0.14.0.20020904132723.00bc28e8@mail.lusidor.nu> <20020904124832.GA15994@submonkey.net> <44y9ahecn2.fsf@be-well.ilk.org> <20020905091754.GE10717@freepuppy.bellavista.cz> <44bs7c1phq.fsf@be-well.ilk.org> <20020905144627.GL10717@freepuppy.bellavista.cz>
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# neuhauser@bellavista.cz / 2002-09-05 16:46:28 +0200:
> # freebsd-questions-local@be-well.no-ip.com / 2002-09-05 10:26:57 -0400:
> > Roman Neuhauser <neuhauser@bellavista.cz> writes:
> > > # freebsd-questions-local@be-well.no-ip.com / 2002-09-04 16:13:53 -0400:
> > > > For the record, they are *not* the same thing.
> > >
> > > could you elaborate?
> >
> > I'm not 100% sure that I completely understand the technical details,
> > but I'll give it a shot. You could go check the archives of the
> > freebsd-fs list for more authoritative information on the subject.
> >
> > Very briefly, they implement similar functionality through different
> > abstractions. mount_union is a filesystem in its own right -- it
> > "stacks" on top of other filesystem types and uses their capabilities
> > to perform the I/O operations, but to the system I/O code, it looks
> > like a filesystem. The union mount option is visible at a higher
> > level; the filesystem code itself doesn't know about the shadowing.
> >
> > Or something like that. At any rate, they don't seem to share any
> > code.
>
> this is interesting. I always thought that mount(8) works by
> invoking mount_whatever(8) where whatever is determined by the value
> passed in the -t option to mount(8). looks like this isn't the case,
> then... hm:
aargh, sorry for talking out of my ass. I didn't realize I was
confusing -o union with -t union.
sorry!
--
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