Date: Fri, 13 Dec 2002 16:51:54 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Peter Wemm <peter@wemm.org> Cc: Dan Nelson <dnelson@allantgroup.com>, Nate Lawson <nate@root.org>, Kevin Oberman <oberman@es.net>, FreeBSD current users <current@FreeBSD.ORG>, re@freebsd.org Subject: Re: 5.0 showstopper Message-ID: <Pine.BSF.4.21.0212131650140.9978-100000@InterJet.elischer.org> In-Reply-To: <20021214004513.733AB2A7EA@canning.wemm.org>
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On Fri, 13 Dec 2002, Peter Wemm wrote:
> Julian Elischer wrote:
> >
> >
> > looking at the code in src/sys/i386/i386/dump_machdep.c,
> >
> > we see:
> > 78 dumplo = di->mediaoffset + di->mediasize - Maxmem *
> > (off_t)PAGE_SIZE;
> > 79 dumplo -= sizeof kdh * 2;
> > 80 i = di->dumper(di->priv, &kdh, 0, dumplo, sizeof kdh);
> > 81 if (i)
> > 82 printf("\nDump failed writing header (%d)\n", i);
> > 83 dumplo += sizeof kdh;
> > 84 i = 0;
> >
> > It looks like the following test should go after line 77
> >
> > if (di->mediasize < ((Maxmem * (off_t)PAGE_SIZE) +
> > (sizeof kdh * 2) + (16*1024)) {
> > /* 16K is an arbitrary buffer
> > * in case the swap part is
> > * the first part
> > */
> > printf("\nDump failed. Partition too small.\n");
> > return;
> > }
>
> We used to force a 64K safety buffer for swapon, and I think we also did
> 64K for dump before the last MI dump code conversion. I'd feel a little
> happier if you used 64K here instead of 16K.
I'm happy with 64k.. I just chose 16 arbitrarily because I remembered
that there was SOME safety value but I couldn't remember what it was..
:-)
does it look reasonable to you?
>
>
> Cheers,
> -Peter
> --
> Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
> "All of this is for nothing if we don't go to the stars" - JMS/B5
>
>
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