questions about File System Switch

[Guy Harris]

>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.