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From: tim@cithep.UucP (Tim Smith )
Newsgroups: net.unix-wizards
Subject: Re: History lessons
Message-ID: <92@cithep.UucP>
Date: Wed, 17-Jul-85 23:55:17 EDT
Article-I.D.: cithep.92
Posted: Wed Jul 17 23:55:17 1985
Date-Received: Fri, 19-Jul-85 01:42:45 EDT
References: <6727@Shasta.ARPA> <2071@ucf-cs.UUCP> <2414@sun.uucp>, <1014@ucbtopaz.CC.Berkeley.ARPA>
Organization: Caltech HEP, Pasadena, CA
Lines: 13

> I have it from a reliable source (Ritchie) that in the original Unix file
> system, the directory structure was an arbitrary graph. It was changed
> to a tree because of the hair involved in consistency checking. As late
> as v6, ln command allowed root to link directories, and across file
> systems. This may have been a Purdue hack, though.

Root can still link directories, as far as the kernel is concerned.  As for
linking across file systems, this must be a Purdue hack, since it is not
possible on ordinary v6,v7,TS 1.?, SIII, and SV for very fundamental reasons.
How did they change the file system to allow this?
-- 
					Tim Smith
				ihnp4!{wlbr!callan,cithep}!tim