Path: utzoo!attcan!uunet!auspex!guy
From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.unix.wizards
Subject: Re: questions about File System Switch
Keywords: File System Switch FSS
Message-ID: <696@auspex.UUCP>
Date: 13 Dec 88 19:02:55 GMT
References: <352@siswat.UUCP>
Reply-To: guy@auspex.UUCP (Guy Harris)
Organization: Auspex Systems, Santa Clara
Lines: 23

>Is FSS fully documented in some AT&T manual?

Not as far as I know; it's getting replaced with something close to
SunOS 4.0 vnodes (with some cleanups) in S5R4.0.

>What release of System V introduced FSS?

S5R3.

>Is it always there, or is it a vendor option that can be
>left out?  (I only have S5R2 experience.)

If a vendor works really hard at it, I suppose they can leave it out,
but I doubt they would.

>Is adding a new filesystem on the same level as adding a
>device driver to the kernel? For example, can a binary site
>use some type of link kit to add filesystem routines without
>source code?

I think that was the intent.  Assuming your file system can plug into
the interface provided without change to the interface, it should be
possible.