From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 29553 invoked from network); 5 Jul 2020 00:07:09 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 5 Jul 2020 00:07:09 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 211A99C759; Sun, 5 Jul 2020 10:07:01 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 62D5D9C6C3; Sun, 5 Jul 2020 10:06:07 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 77A329C5E1; Sun, 5 Jul 2020 10:06:04 +1000 (AEST) Received: from viclamta05p.bpe.bigpond.com (viclamta05p.bpe.bigpond.com [203.38.21.69]) by minnie.tuhs.org (Postfix) with ESMTPS id 5710894585 for ; Sun, 5 Jul 2020 10:06:03 +1000 (AEST) Received: from smtp.telstra.com ([10.10.26.4]) by viclafep05p-svc.bpe.nexus.telstra.com.au with ESMTP id <20200705000601.VEXF31847.viclafep05p-svc.bpe.nexus.telstra.com.au@smtp.telstra.com> for ; Sun, 5 Jul 2020 10:06:01 +1000 X-RG-Spam: Unknown X-RazorGate-Vade: gggruggvucftvghtrhhoucdtuddrgeduiedrtdelgdeftdcutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfupfevtfgpvffgnffuvffttedpqfgfvfenuceurghilhhouhhtmecugedttdenucenucfjughrpeffhffvufgjkfhffgggtgesthdttddttdervdenucfhrhhomhepffgrvhgvucfjohhrshhfrghllhcuoegurghvvgeshhhorhhsfhgrlhhlrdhorhhgqeenucggtffrrghtthgvrhhnpeekieetjeeuuefhfeeguedvudeifeevudfgvedtffekhfffjeekhfdutdetheethfenucfkphepuddutddrudeguddrudelfedrvdeffeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhephhgvlhhopegrnhgvuhhrihhnrdhhohhrshhfrghllhdrohhrghdpihhnvghtpeduuddtrddugedurdduleefrddvfeefpdhmrghilhhfrhhomhepoegurghvvgeshhhorhhsfhgrlhhlrdhorhhgqedprhgtphhtthhopeeothhuhhhssehtuhhhshdrohhrgheq X-RazorGate-Vade-Verdict: clean 0 X-RazorGate-Vade-Classification: clean X-RG-VS-CLASS: clean Received: from aneurin.horsfall.org (110.141.193.233) by smtp.telstra.com (5.8.420) id 5E8A564B0FFDAC0A for tuhs@tuhs.org; Sun, 5 Jul 2020 10:06:00 +1000 Received: from aneurin.horsfall.org (localhost [127.0.0.1]) by aneurin.horsfall.org (8.15.2/8.15.2) with ESMTP id 06505xOI019809 for ; Sun, 5 Jul 2020 10:05:59 +1000 (EST) (envelope-from dave@horsfall.org) Received: from localhost (dave@localhost) by aneurin.horsfall.org (8.15.2/8.15.2/Submit) with ESMTP id 06505wbg019806 for ; Sun, 5 Jul 2020 10:05:59 +1000 (EST) (envelope-from dave@horsfall.org) X-Authentication-Warning: aneurin.horsfall.org: dave owned process doing -bs Date: Sun, 5 Jul 2020 10:05:57 +1000 (EST) From: Dave Horsfall To: The Eunuchs Hysterical Society In-Reply-To: <20200624193647.GB14302@mcvoy.com> Message-ID: References: <4FC7FA55-5035-41A2-B52F-AE26DC8BED2C@planet.nl> <20200623140124.GR22291@mcvoy.com> <20200624193647.GB14302@mcvoy.com> User-Agent: Alpine 2.21.9999 (BSF 287 2018-06-16) X-GPG-Public-Key: http://www.horsfall.org/gpgkey.pub X-GPG-Fingerprint: 05B4 FFBC 0218 B438 66E0 587B EF46 7357 EF5E F58B X-Home-Page: http://www.horsfall.org/ X-Witty-Saying: "chmod 666 the_mode_of_the_beast" MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII Subject: Re: [TUHS] VFS prior to 1984 X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On Wed, 24 Jun 2020, Larry McVoy wrote: >> In the end, early NFS was notorious for putting 'holes' in the files >> because of the automatic seek in every operation and errors not coming >> until close(2) time. > > You have no idea how many of those holes that 16 bit SCCS checksum has > found (BitKeeper kept it). Aren't holes part of the file system semantics? Seek beyond EOF, write a block, and you've created unallocated holes. Of course, they are filled with zeroes as soon as you copy the file... I did fiddle with "cp" to detect those holes and preserve them, but gave up for some reason (performance hit in checking for all-zero blocks, I think, along with some weird problem with the last block being all zeroes). I used NFS when it first appeared and got bitten quite badly; I've never really trusted it ever since, but I understand that it's vastly improved. -- Dave