From owner-freebsd-current@freebsd.org Wed Aug 7 13:02:28 2019 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 43932AAA2E for ; Wed, 7 Aug 2019 13:02:28 +0000 (UTC) (envelope-from phk@critter.freebsd.dk) Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 463Wr30nMzz3D1J for ; Wed, 7 Aug 2019 13:02:26 +0000 (UTC) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (v-critter.freebsd.dk [192.168.55.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by phk.freebsd.dk (Postfix) with ESMTPS id D415F1AF112; Wed, 7 Aug 2019 13:02:24 +0000 (UTC) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.15.2/8.15.2) with ESMTPS id x77D2O7D042459 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Wed, 7 Aug 2019 13:02:24 GMT (envelope-from phk@critter.freebsd.dk) Received: (from phk@localhost) by critter.freebsd.dk (8.15.2/8.15.2/Submit) id x77D2Nft042458; Wed, 7 Aug 2019 13:02:23 GMT (envelope-from phk) To: Enji Cooper cc: "O. Hartmann" , freebsd-current , mckusick@mckusick.com Subject: Re: CURRENT: supeblock hash failure - CURRENT wrecking disks In-reply-to: <39FB31E6-A8EC-484C-B297-39C19A787E44@gmail.com> From: "Poul-Henning Kamp" References: <20190807103725.3d06ceca@freyja> <39FB31E6-A8EC-484C-B297-39C19A787E44@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <42456.1565182943.1@critter.freebsd.dk> Content-Transfer-Encoding: quoted-printable Date: Wed, 07 Aug 2019 13:02:23 +0000 Message-ID: <42457.1565182943@critter.freebsd.dk> X-Rspamd-Queue-Id: 463Wr30nMzz3D1J X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of phk@critter.freebsd.dk designates 130.225.244.222 as permitted sender) smtp.mailfrom=phk@critter.freebsd.dk X-Spamd-Result: default: False [-2.51 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.987,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-0.97)[-0.969,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[freebsd.dk]; TO_DN_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.60)[-0.599,0]; IP_SCORE(0.05)[ip: (0.09), ipnet: 130.225.0.0/16(0.04), asn: 1835(0.11), country: EU(-0.00)]; FORGED_SENDER(0.30)[phk@phk.freebsd.dk,phk@critter.freebsd.dk]; FREEMAIL_TO(0.00)[gmail.com]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:1835, ipnet:130.225.0.0/16, country:EU]; FROM_NEQ_ENVFROM(0.00)[phk@phk.freebsd.dk,phk@critter.freebsd.dk]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Aug 2019 13:02:28 -0000 -------- In message <39FB31E6-A8EC-484C-B297-39C19A787E44@gmail.com>, Enji Cooper w= rites : There is an "interesting" failure-mechanism when you move a disk between 13/current and older systems which do not support ufs-hashes. It will be prudent to make 11 and 12 clear the "use hashes" flags in the superblocks of all filesystems they mount R/W, to limit the amount havoc this will cause when people start playing with 13. -- = Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe = Never attribute to malice what can adequately be explained by incompetence= .