Path: utzoo!attcan!uunet!virtech!cpcahil
From: cpcahil@virtech.uucp (Conor P. Cahill)
Newsgroups: comp.unix.questions
Subject: Re: SYS V Rel 4, Virtual File Systems
Keywords: Unix,ESIX
Message-ID: <1990Apr14.131408.10838@virtech.uucp>
Date: 14 Apr 90 13:14:08 GMT
References: <23299@abcom.ATT.COM>
Reply-To: cpcahil@virtech.UUCP (Conor P. Cahill)
Organization: Virtual Technologies Inc., Sterling VA
Lines: 20

In article <23299@abcom.ATT.COM> brr@abcom.ATT.COM (Rao) writes:
>
>	The new release of AT&T SYS V, from what I have read in
>	the UNIX mags, allows for Virtual File Systems.
>
>	What is Virtual File Systems used for?

The Virtual File System is the System V R4 equivalent to the Sys V R3
File system switch.  I believe it originates in SunOS.

What it does is place a layer between the file system specific code
and the generic code in the kernel.  This makes it much easier to add
new file system types (like NFS, or UFS) since the file system independent
portion (above the VFS) does not need to be modified.


-- 
Conor P. Cahill            (703)430-9247        Virtual Technologies, Inc.,
uunet!virtech!cpcahil                           46030 Manekin Plaza, Suite 160
                                                Sterling, VA 22170