Date: Sun, 27 Aug 2000 13:55:01 +0930 From: Greg Lehey <grog@lemis.com> To: Mike Meyer <mwm@mired.org> Cc: questions@freebsd.org Subject: Re: read only / filesystem Message-ID: <20000827135500.A88160@wantadilla.lemis.com> In-Reply-To: <14760.37457.359972.176638@guru.mired.org>; from mwm@mired.org on Sat, Aug 26, 2000 at 11:00:17PM -0500 References: <78875170@toto.iv> <14760.37457.359972.176638@guru.mired.org>
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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? > > su-2.04# cd / > su-2.04# touch x > su-2.04# rm x > su-2.04# mount -u -o ro / > su-2.04# touch x > touch: x: Read-only file system > > Does one of the system security levels prohibit remounting file > systems r/o once have been mounted r/w? 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. 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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