[TUHS] the guy who brought up SVr4 on Sun machines

Joerg Schilling schily at schily.net
Thu Jan 12 08:57:51 AEST 2017


Dan Cross <crossd at gmail.com> wrote:

> On Tue, Jan 10, 2017 at 11:20 AM, Joerg Schilling <schily at schily.net> wrote:
>
> > Berny Goodheart <berny at berwynlodge.com> wrote:
> > [snip]
> > > VFSSW                         <=== NO, this is from SunOS-4
> >
>
> Surely Berny meant the file system switch here, which could have come from
> early system V, but originated in research Unix (8th edition?). Note that
> this list is very similar to that in the early part of his book on System V
> internals.

It is rather a part of the VFS interface that has first been completed with 
SunOS-3.0 in late 1985.

There are small changes introduced into the VFS switch for SVr4 to permit to 
mount special filesystems without the need of root permissions. They cause the 
major differences between SunOS-4 and Svr4.

VFS uses two interface parts: 

-	the VFS switch with the vfs interface functions to mount a filesystem
	and to stat it

-	the VFS vnode interface with the vnode interface functions to hold the
	interfaces like open(),	mmap(), ...

Jörg

-- 
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