Date: Thu, 2 Feb 1995 11:22:33 +0000 (MST) From: Jeremy Chatfield <jdc@crab.xinside.com> To: wollman@halloran-eldar.lcs.mit.edu (Garrett Wollman) Cc: jkh@FreeBSD.org, wollman@halloran-eldar.lcs.mit.edu, hackers@freefall.cdrom.com Subject: Re: Am I dreaming? Message-ID: <199502021822.LAA06686@crab.xinside.com> In-Reply-To: <9502021811.AA21595@halloran-eldar.lcs.mit.edu> from "Garrett Wollman" at Feb 2, 95 01:11:57 pm
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Garrett Wollman writes:
>
> <<On Wed, 01 Feb 1995 21:16:29 -0800, "Jordan K. Hubbard" <jkh@freebsd.org> said:
>
> > I think the question was more one of how it get its mitts on user
> > requests for files that aren't currently mounted.
>
> They /are/ mounted. amd is an NFS server.
Intepreting my own question for you...
The resource is not permanently mounted. When some file attribute is
requested from a currently unmounted resource, the automount daemon
issues the request to mount the resource from a suitable host or
hosts. While this is happening, the system is not blocked on further
operations. If considering the remote file system that was under
discussion at the start of this thread, then a mechanism similar to
that of the automount daemon would probably be a useful concept,
since it would overcome the problem posed of the kernel blocking on
the request for a network resource.
The situation with the automount daemon is obviously different if the
resource is currently mounted. The interesting bit is how it gets
from not-mounted to mounted without everything stopping. I think
someone else answered that bit. So, back to the original question,
about filesystems, which was, umm, I forget :-)
Cheers, JeremyC.
--
Jeremy Chatfield, +1(303)470-5302, FAX:+1(303)470-5513, email:jdc@xinside.com
X Inside Inc, P O Box 10774, Golden, CO 80401-0610, USA.
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