From: Rob Landley <rob@landley.net>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Theodore Tso" <tytso@mit.edu>,
"Duane Griffin" <duaneg@dghda.com>,
Valdis.Kletnieks@vt.edu,
"Martin MOKREJŠ" <mmokrejs@ribosome.natur.cuni.cz>,
"Pavel Machek" <pavel@suse.cz>,
"kernel list" <linux-kernel@vger.kernel.org>,
"Andrew Morton" <akpm@osdl.org>,
mtk.manpages@gmail.com, rdunlap@xenotime.net,
linux-doc@vger.kernel.org
Subject: Re: document ext3 requirements
Date: Sun, 4 Jan 2009 21:22:35 -0600 [thread overview]
Message-ID: <200901042122.35828.rob@landley.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0901042015230.31141@anakin>
On Sunday 04 January 2009 13:21:06 Geert Uytterhoeven wrote:
> I think most people get shocked when they discover that mounting something
> read-only may actualy write to the media. This is a bit unexpected (hey, if
> I mount `read-only', I expect that no writes will happen), as it behaved
> differently before the introduction of journalling.
Is this an unreasonable use case:
kill -STOP $(pidof qemu)
mount -o loop,ro hdb.img blah
cp blah/thingy thingy
umount blah
kill -CONT $(pidof qemu)
Currently, if your loopback mount is -t ext3 it'll write to the block device,
and if your mount is -t ext2 it'll refuse to work on an unclean ext3
filesystem, even if it's read only. (But it _will_ work on an unclean ext2
filesystem.)
My theory when I first found out about this was "the filesystem developers
hate me personally".
Rob
next prev parent reply other threads:[~2009-01-05 3:23 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-03 12:38 document ext3 requirements Pavel Machek
2009-01-03 21:17 ` Martin MOKREJŠ
2009-01-03 22:06 ` Pavel Machek
2009-01-03 22:17 ` Duane Griffin
2009-01-03 22:29 ` Pavel Machek
2009-01-03 23:01 ` Martin MOKREJŠ
2009-01-03 23:38 ` Duane Griffin
2009-01-03 23:50 ` Martin MOKREJŠ
2009-01-03 23:58 ` Robert Hancock
2009-01-04 0:08 ` Martin MOKREJŠ
2009-01-04 21:49 ` Ingo Oeser
2009-01-04 0:00 ` Duane Griffin
2009-01-04 0:11 ` Martin MOKREJŠ
2009-01-04 0:41 ` Duane Griffin
2009-01-04 3:52 ` Valdis.Kletnieks
2009-01-04 14:24 ` Duane Griffin
2009-01-04 18:40 ` Theodore Tso
2009-01-04 19:21 ` Geert Uytterhoeven
2009-01-04 19:36 ` Theodore Tso
2009-01-04 19:51 ` Duane Griffin
2009-01-04 21:55 ` Theodore Tso
2009-01-04 22:06 ` Duane Griffin
2009-01-04 22:42 ` Bron Gondwana
2009-01-05 3:22 ` Rob Landley [this message]
2009-01-04 0:19 ` Pavel Machek
2009-01-05 2:55 ` Rob Landley
2009-01-04 19:56 ` Rob Landley
2009-01-05 19:16 ` Theodore Tso
2009-01-06 19:20 ` Rob Landley
2009-01-06 10:08 ` Matthias Andree
2009-01-06 15:23 ` Theodore Tso
2009-01-03 23:12 ` Duane Griffin
2009-01-06 10:06 ` Matthias Andree
2009-01-04 2:32 ` Theodore Tso
2009-01-04 22:33 ` Pavel Machek
2009-01-04 22:34 ` [patch] document ext3 a bit better Pavel Machek
2009-01-05 14:57 ` Theodore Tso
2009-01-06 9:21 ` Pavel Machek
2009-01-09 23:24 ` Jiri Kosina
2009-01-09 23:36 ` Randy Dunlap
2009-01-09 23:47 ` Jiri Kosina
2009-01-04 13:35 ` document ext3 requirements Alexander E. Patrakov
2009-01-04 13:53 ` Valdis.Kletnieks
2009-01-04 18:21 ` Michael Tokarev
2009-01-04 18:38 ` Theodore Tso
2009-01-04 22:37 ` Pavel Machek
2009-01-04 23:58 ` Theodore Tso
2009-01-05 11:43 ` Alan Cox
2009-01-07 11:59 ` Rob Landley
2009-01-04 20:10 ` Pavel Machek
2009-01-04 19:49 ` Rob Landley
2009-01-04 22:06 ` Theodore Tso
2009-01-04 22:25 ` Pavel Machek
2009-01-04 23:00 ` [patch] " Pavel Machek
2009-01-05 2:42 ` Rob Landley
2009-01-05 9:54 ` Pavel Machek
2009-01-04 23:07 ` Pavel Machek
2009-01-05 1:38 ` Rob Landley
2009-01-04 22:55 ` Pavel Machek
2009-01-05 0:16 ` david
2009-01-05 9:38 ` Pavel Machek
2009-01-05 1:50 ` Rob Landley
2009-01-05 3:20 ` Martin K. Petersen
2009-01-05 9:45 ` Pavel Machek
2009-01-05 11:28 ` Alan Cox
2009-01-05 19:15 ` Martin K. Petersen
2009-01-05 20:19 ` Theodore Tso
[not found] <fa.pmCH9X+XujDl6RH6/TpkNtsTnbk@ifi.uio.no>
[not found] ` <fa.b62zZFe5e154PhgA+0sdwVXD9F0@ifi.uio.no>
[not found] ` <fa.ZTpiSvxEhp3YJDepiUQs+cU0C98@ifi.uio.no>
[not found] ` <fa.xvvufQC6zTpU9R6vhDl51DR5V7A@ifi.uio.no>
[not found] ` <fa.pkV69eXC76Pb9fnmERdAwXX9OKA@ifi.uio.no>
[not found] ` <fa.hQTLXdIllf+hs4yQb092u6fowq0@ifi.uio.no>
2009-01-04 19:08 ` Sitsofe Wheeler
2009-01-04 19:31 ` Theodore Tso
2009-01-04 22:40 ` Pavel Machek
2009-01-04 23:30 ` Theodore Tso
2009-01-05 3:49 ` Rob Landley
2009-01-05 4:31 ` Robert Hancock
2009-01-05 5:00 ` david
2009-01-05 11:19 ` Alan Cox
2009-01-05 19:00 ` Rob Landley
2009-01-05 19:27 ` Martin K. Petersen
2009-01-06 10:41 ` Matthias Andree
2009-01-06 15:30 ` Theodore Tso
[not found] ` <20090106153020.GB13086__11022.1833143898$1231255950$gmane$org@mit.edu>
2009-01-06 15:40 ` Andi Kleen
2009-01-06 15:57 ` Theodore Tso
2009-01-06 17:31 ` Andi Kleen
2009-01-06 19:31 ` Rob Landley
2009-01-27 13:24 ` Thierry Vignaud
2009-01-27 13:37 ` Alan Cox
2009-01-06 10:36 ` Matthias Andree
[not found] <fa.P4z5CJpM0xT37PWJuOuCHDkO76o@ifi.uio.no>
[not found] ` <fa.eOwOqydZi0qs6K1nmNxBFGQMV40@ifi.uio.no>
[not found] ` <fa.26o5IHCAC3TQdXupl62CLYwQ+Wk@ifi.uio.no>
2009-01-04 23:13 ` Sitsofe Wheeler
2009-01-05 2:51 ` Rob Landley
2009-01-05 3:33 ` Martin K. Petersen
2009-01-05 4:02 ` david
2009-01-05 3:52 ` Rob Landley
[not found] ` <fa.GBkQuKdRj+YRVczlNLFhGvaw3WY@ifi.uio.no>
[not found] ` <fa.rCyCghh/+staAmYi/+gwYvefIS0@ifi.uio.no>
[not found] ` <fa.c5j7jAMUnJPvgI9Oj/VczSDNakE@ifi.uio.no>
[not found] ` <fa.377DMq2lPMyaHxadPnApFSJFoCg@ifi.uio.no>
2009-01-05 20:36 ` Sitsofe Wheeler
2009-01-05 23:09 ` Theodore Tso
[not found] ` <fa.ucJLoSQwk9OAj6T6x60tbWaiTAo@ifi.uio.no>
2009-01-05 22:25 ` Sitsofe Wheeler
2009-01-06 4:08 ` Rob Landley
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