Directory truncation from 4.3bsd?

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Article #11746

#11746

From: David Robinson
Date: Wed, 29 Mar 1989 22:11

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4.3BSD added the wonderful feature that a directory with unused disk
blocks at the end is truncated when a file is created, since create has to
search the entire directory anyways it can also detect empty directory
entries.

On our Suns running 4.0.1 this does not seem to be happening, I have
noticed emtpy directories that are over 100K in size, most notable
/usr/spool/news/.rnews and /usr/spool/mqueue.  I know that the 3.X NFSSRC
is based on 4.2BSD ufs code and does not have it but I thought that 4.0
would pick up the 4.3bsd features.  

Anyone have any insight on if this was deliberate or just an oversight?

	David Robinson		elroy!david@csvax.caltech.edu     ARPA
				david@elroy.jpl.nasa.gov	  ARPA
				{cit-vax,ames}!elroy!david	  UUCP

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!sun-spots-request
From: david@elroy.jpl.nasa.gov (David Robinson)
Newsgroups: comp.sys.sun
Subject: Directory truncation from 4.3bsd?
Keywords: SunOS
Message-ID: <14379@elroy.Jpl.Nasa.Gov>
Date: 29 Mar 89 22:11:11 GMT
Sender: usenet@rice.edu
Organization: Image Analysis Systems Grp, JPL
Lines: 16
Approved: Sun-Spots@rice.edu
Original-Date: 14 Mar 89 01:23:42 GMT
X-Sun-Spots-Digest: Volume 7, Issue 212, message 11 of 14