Date: Thu, 8 May 2003 23:25:02 +0200 (CEST) From: Lukas Ertl <l.ertl@univie.ac.at> To: Kirk McKusick <mckusick@beastie.mckusick.com> Cc: freebsd-current@freebsd.org Subject: Re: bin/51619 Message-ID: <20030508232159.A789@leelou.in.tern> In-Reply-To: <200305082047.h48KlDTh026805@beastie.mckusick.com> References: <200305082047.h48KlDTh026805@beastie.mckusick.com>
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On Thu, 8 May 2003, Kirk McKusick wrote: > Your proposed patch would work much better. There is a small > possibility that it would stomp a boot block that just happened > to have the filesystem magic number at that location, but the > chances of that seem pretty remote. It does not address the > alternate superblock issue. The first UFS1 alternate is 32 > sectors (16K) in from the beginning of the disk. That alternate > also remains untouched by UFS2. So, someone manually running > fsck will be given the opportunity to look for alternate > superblocks and will find that one and *still* end up messing > up the filesystem. Well, Unix always gives you enough rope to hang yourself :-) > Indeed to be completely safe, you would need to look up every alternate > superblock and zero out its magic number (see the last for-loop in > mkfs() for details on how this is done). Ok Kirk, thanks for your patience so far. I'm trying to come up with an extended patch tomorrow. best regards, le --=20 Lukas Ertl eMail: l.ertl@univie.ac.at UNIX-Systemadministrator Tel.: (+43 1) 4277-14073 Zentraler Informatikdienst (ZID) Fax.: (+43 1) 4277-9140 der Universit=E4t Wien http://mailbox.univie.ac.at/~le/
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