Date: Sun, 27 Aug 2000 09:35:07 GMT From: Salvo Bartolotta <bartequi@inwind.it> To: Greg Lehey <grog@lemis.com> Cc: freebsd-questions@FreeBSD.ORG Subject: mount -u potential problems (?) (was Re: read only / filesystem) Message-ID: <20000827.9350700@mis.configured.host> In-Reply-To: <20000827160325.D88160@wantadilla.lemis.com> References: <78875170@toto.iv> <14760.37457.359972.176638@guru.mired.org> <20000827135500.A88160@wantadilla.lemis.com> <14760.45477.402050.39137@guru.mired.org> <20000827160325.D88160@wantadilla.lemis.com>
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>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 8/27/00, 7:33:25 AM, Greg Lehey <grog@lemis.com> wrote regarding Re: =
read only / filesystem:
> On Sunday, 27 August 2000 at 1:13:57 -0500, Mike Meyer wrote:
> > Greg Lehey writes:
> >> On Saturday, 26 August 2000 at 23:00:17 -0500, Mike Meyer wrote:
> >>> Greg Lehey writes:
> >>>> On Thursday, 24 August 2000 at 23:49:17 -0700, R Joseph Wright=20
wrote:
> >>>>> Or is it easy enough to simply remount / rw when changes to /etc=
=20
are
> >>>>> needed?
> >>>> You can do this, but you can't go back to an ro mount.
> >>> Uh - why not?
> >> It's not reliable. There are some problems with dirty buffers when=
> >> you make the file system read-only again. I forget whether it's da=
ta
> >> corruption or a panic, but the only safe way to do this is to umoun=
t
> >> the file system and remount it r/o, obviously not an option here.
> >
> > Sounds like an OS bug. The mount system call should make sure the fi=
le
> > system is in sync before doing the udpate mount. You could, of cours=
e,
> > do the sync's by hand until that happens.
> Sure, it's a bug. But it's not one that interests many people, so
> nobody has fixed it. Don't underestimate its complexity.
> Greg
> --
I seemed to understand that the reversion was **ONLY** dangerous if=20
the "-f" ("force") option had been specified; at least, that is what I=20
was expressly told not long ago.
Now I am just a little more confused :-)
Best regards,
Salvo
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