Date: Sun, 27 Aug 2000 16:03:25 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Meyer <mwm@mired.org> Cc: questions@freebsd.org Subject: Re: read only / filesystem Message-ID: <20000827160325.D88160@wantadilla.lemis.com> In-Reply-To: <14760.45477.402050.39137@guru.mired.org>; from mwm@mired.org on Sun, Aug 27, 2000 at 01:13:57AM -0500 References: <78875170@toto.iv> <14760.37457.359972.176638@guru.mired.org> <20000827135500.A88160@wantadilla.lemis.com> <14760.45477.402050.39137@guru.mired.org>
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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 wrote: >>>>> Or is it easy enough to simply remount / rw when changes to /etc 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 data >> corruption or a panic, but the only safe way to do this is to umount >> 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 file > system is in sync before doing the udpate mount. You could, of course, > 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 -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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