From mboxrd@z Thu Jan 1 00:00:00 1970 From: jdow Subject: Re: Partitions: Amiga RDB partition on 2 TB disk way too big, while OK in AmigaOS 4.1 Date: Sun, 17 Jun 2012 03:53:08 -0700 Message-ID: <4FDDB714.2020005@earthlink.net> References: <201206171033.51625.Martin@lichtvoll.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from elasmtp-mealy.atl.sa.earthlink.net ([209.86.89.69]:35003 "EHLO elasmtp-mealy.atl.sa.earthlink.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754780Ab2FQK64 (ORCPT ); Sun, 17 Jun 2012 06:58:56 -0400 In-Reply-To: <201206171033.51625.Martin@lichtvoll.de> Sender: linux-m68k-owner@vger.kernel.org List-Id: linux-m68k@vger.kernel.org To: Martin Steigerwald Cc: linux-kernel@vger.kernel.org, linux-m68k@vger.kernel.org, Jens Axboe By the way, what did you use to setup the Amiga RDBs? {^_^} Joanne Dow On 2012/06/17 01:33, Martin Steigerwald wrote: > Sorry, forgot to keep Cc. > > I think I will keep the disk as is for a while. I just won=B4t plug i= t to > the Amiga, since I have my Amiga backup on another dedicated > disk and do not want to overwrite my Linux backups. So its available > for testing for a while. It should be save as long as I use the disk > in Linux only. > > For safety I will recreate all backups. I can checksum the BTRFS base= d > backup partition for checksum errors, but fscking the other non > BTRFS ones will only give a vague hint. > > > Am Sonntag, 17. Juni 2012 schrieb Martin Steigerwald: >> Hi Jens, hi Linux m68k developers, >> >> I reported that as >> >> https://bugzilla.kernel.org/show_bug.cgi?id=3D43511 >> >> I will attach there some more debug data like binary copy of RDB and >> such. >> >> But maybe its easier to discuss here. > > I think this one is pretty serious: > > merkaba:~> pvdisplay /dev/sdb1 > --- Physical volume --- > PV Name /dev/sdb1 > VG Name steigerwald > PV Size 1,82 TiB / not usable 4,08 MiB > Allocatable yes > PE Size 4,00 MiB > Total PE 476931 > Free PE 105731 > Allocated PE 371200 > PV UUID ZXMECC-JAir-lX8Q-rLhS-W1cS-quwz-b3FXWp > > merkaba:~> vgdisplay steigerwald > --- Volume group --- > VG Name steigerwald > System ID > Format lvm2 > Metadata Areas 2 > Metadata Sequence No 7 > VG Access read/write > VG Status resizable > MAX LV 0 > Cur LV 5 > Open LV 1 > Max PV 0 > Cur PV 1 > Act PV 1 > VG Size 1,82 TiB > PE Size 4,00 MiB > Total PE 476931 > Alloc PE / Size 371200 / 1,42 TiB > Free PE / Size 105731 / 413,01 GiB > VG UUID uhjjE1-0yrD-Ch1A-d9qL-P5jY-UDXE-io4bpi > > > with > > merkaba:~#1> amiga-fdisk -l /dev/sdc > Disk /dev/sdc: 3 heads, 16 sectors, 81396441 cylinders, RDB: 0 > Logical Cylinders from 43 to 81396440, 24576 bytes/Cylinder > > Device Boot Mount Begin End Size Pri BBlks Syste= m > /dev/sdc1 * 43 65536043 1572864024 0 0 Lin= ux > native > /dev/sdc2 * 65536044 78643244 314572824 0 0 > [unknown] > /dev/sdc3 * 78643245 81396440 66076704 0 0 Ami= ga > FFS Int. > > > Due to truncating oversized partition instead of refusing to use > them the PV and consequently VG span the whole disk instead > of leaving space for the >350GB in the two other partitions: > > merkaba:~> cat /proc/partitions > major minor #blocks name > > [=85] > 8 16 1953514584 sdb > 8 17 1953513552 sdb1 > > (now sdb instead of sdc back when I run amiga-fdisk) > > > This is just asking for trouble. Thus: > > Bug 43521 - Amiga RDB partitions: truncates miscaluted partitions siz= e > instead of refusing to use it > https://bugzilla.kernel.org/show_bug.cgi?id=3D43521 > > > My suggestion is to bail out if a partition size looks insane and > impossible. > Having to manually fix it up to access the data on disk still looks b= etter > to me than potentially overwriting lots of data. > > > > Until today I never actually did an Amiga backup to the disk, I just > created the two Amiga partitions and copied some screenshots of them > but that might be enough to explain the checksum errors I found in a > BTRFS backup partition. > > I am now checking my Linux backups. They might be save, cause not all > space on the volume group is used. > > See: > > kernel got struck while scrubbing BTRFS with node- and leafsize 32768 > http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg17108.html > > s/struck/stuck > > Thanks, >