From owner-freebsd-questions@freebsd.org Mon Feb 13 03:11:14 2017 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B11F1CDC7F2 for ; Mon, 13 Feb 2017 03:11:14 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 6D01311CB for ; Mon, 13 Feb 2017 03:11:14 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id v1D3B9ph079081 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Sun, 12 Feb 2017 19:11:13 -0800 (PST) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.14.2/Submit) with UUCP id v1D3B9YW079080 for freebsd-questions@freebsd.org; Sun, 12 Feb 2017 19:11:09 -0800 (PST) (envelope-from perryh@pluto.rain.com) Received: from fbsd81 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA23557; Sun, 12 Feb 17 19:10:05 PST Date: Sun, 12 Feb 2017 19:09:59 -0800 From: perryh@pluto.rain.com (Perry Hutchison) To: freebsd-questions@freebsd.org Subject: Bugs in fsck(8) and fsck_ufs(8) Message-Id: <58a12387.at7Hz9kYDc2UvWNn%perryh@pluto.rain.com> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Feb 2017 03:11:14 -0000 I have a UFS filesystem that will not mount, and it confuses fsck(8): # mount /dev/da2p2 /mnt mount: /dev/da2p2 : Operation not permitted # fsck /dev/da2p2 fsck: Could not determine filesystem type Why can't fsck(8) recognize the filesystem type? file(1) has no trouble (lines wrapped): # file -s /dev/da2p2 /dev/da2p2: Unix Fast File system [v1] (little-endian), last mounted on /mnt, last written at Sat Jan 7 18:18:40 2017, clean flag 0, number of blocks 674416, number of data blocks 672319, number of cylinder groups 13, block size 8192, fragment size 1024, minimum percentage of free blocks 8, rotational delay 0ms, disk rotational speed 60rps, TIME optimization To be outdone by file(1) in filesystem type recognition is pretty clearly a bug in fsck(8), but not a terribly serious one since it can be gotten around easy enough by running fsck_ufs(8) directly. However, fsck_ufs(8) also has trouble with this filesystem: it claims something is wrong, but it doesn't even identify any specific problems much less fix them: # fsck_ufs /dev/da2p2 ** /dev/da2p2 ** Last Mounted on /mnt ** Phase 1 - Check Blocks and Sizes ** Phase 2 - Check Pathnames ** Phase 3 - Check Connectivity ** Phase 4 - Check Reference Counts ** Phase 5 - Check Cyl groups 13527 files, 628739 used, 43580 free (236 frags, 5418 blocks, 0.0% fragmentation) ***** FILE SYSTEM STILL DIRTY ***** ***** PLEASE RERUN FSCK ***** So it seems this filesystem also provokes a bug in fsck_ufs(8): any problem serious enough to not mark the filesystem as clean is serious enough to at least report, if not fix. (I've rerun it several times, always getting the same result.) I'd try falling back to lower-level tools, but it seems they no longer exist: # which icheck icheck: Command not found. # which dcheck dcheck: Command not found. # which ncheck ncheck: Command not found. Now what?