From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Ric Wheeler <ric@emc.com>,
"J. Bruce Fields" <bfields@fieldses.org>,
Theodore Tso <tytso@mit.edu>,
Thomas Glanzmann <sithglan@stud.uni-erlangen.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: ext4 features
Date: Fri, 07 Jul 2006 10:56:10 -0400 [thread overview]
Message-ID: <1152284170.5726.38.camel@lade.trondhjem.org> (raw)
In-Reply-To: <44ADD223.9010005@tmr.com>
On Thu, 2006-07-06 at 23:16 -0400, Bill Davidsen wrote:
> In most cases you don't care and would be using locking if you did. The
> old value was valid when you read it, the new value is valid, and if
> data is changing in 2us and the change matters, you can't process the
> data before it changes again (or at least may change).
Wrong! The NFS cache consistency model (close-to-open cache consistency)
requires you to be able to revalidate the cache on open() whether or not
you are using posix locking. In fact, most alternatives to posix locking
(for instance dotlocking, which is frequently used by email
applications) rely heavily on this.
See for instance http://nfs.sourceforge.net/#faq_a8
Trond
next prev parent reply other threads:[~2006-07-07 14:56 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-01 16:33 Thomas Glanzmann
2006-07-01 17:07 ` Tomasz Torcz
2006-07-01 17:47 ` Thomas Glanzmann
2006-07-01 18:09 ` Claudio Martins
2006-07-01 18:59 ` Thomas Glanzmann
2006-07-01 18:17 ` Tomasz Torcz
2006-07-03 9:44 ` Gabor Gombas
2006-07-03 20:22 ` Helge Hafting
2006-07-03 20:55 ` Tomasz Torcz
2006-07-03 21:01 ` Arjan van de Ven
2006-07-03 21:46 ` Jeff V. Merkey
2006-07-03 21:25 ` Diego Calleja
2006-07-03 22:17 ` Alan Cox
2006-07-04 14:45 ` Jan Engelhardt
2006-07-04 16:35 ` Jeffrey V. Merkey
2006-07-04 18:52 ` Jeff Garzik
2006-07-04 19:40 ` Jeffrey V. Merkey
2006-07-05 13:35 ` Lew Palm
2006-07-03 23:01 ` Jeff V. Merkey
2006-07-04 9:14 ` Benny Amorsen
2006-07-05 4:21 ` Bill Davidsen
2006-07-05 5:13 ` H. Peter Anvin
2006-07-05 5:45 ` Jeffrey V. Merkey
2006-07-07 14:12 ` Pavel Machek
2006-07-05 10:38 ` Krzysztof Halasa
2006-07-07 14:10 ` Pavel Machek
2006-07-07 17:45 ` Krzysztof Halasa
2006-07-07 21:30 ` Pavel Machek
2006-07-08 10:52 ` Krzysztof Halasa
2006-07-08 10:55 ` Pavel Machek
2006-07-08 11:19 ` Krzysztof Halasa
2006-07-08 11:23 ` Pavel Machek
2006-07-08 18:45 ` Avi Kivity
2006-07-08 20:24 ` Krzysztof Halasa
2006-07-04 9:22 ` Petr Tesarik
2006-07-04 11:35 ` Peter Zijlstra
2006-07-04 11:55 ` ext4 features (salvage) Petr Tesarik
[not found] ` <80294dc60607040508l1022d164ybe0ba10858e54f0c@mail.gmail.com>
2006-07-04 12:31 ` Petr Tesarik
2006-07-04 12:42 ` Helge Hafting
2006-07-04 16:20 ` Matthew Frost
2006-07-04 15:25 ` ext4 features Pavel Machek
2006-07-05 4:10 ` Bill Davidsen
2006-07-03 21:46 ` Valdis.Kletnieks
[not found] ` <Pine.LNX.4.61.0607032354170.31747@yvahk01.tjqt.qr>
2006-07-04 14:37 ` Kernel recycler [was: ext4 features] Jan Engelhardt
2006-07-04 11:14 ` ext4 features Krzysztof Halasa
2006-07-04 22:35 ` Frank van Maarseveen
2006-07-04 23:47 ` Claudio Martins
2006-07-03 22:12 ` Alan Cox
2006-07-03 21:59 ` Arjan van de Ven
2006-07-03 23:31 ` ext4 features (checksums) Neil Brown
2006-07-04 1:03 ` Jeff Garzik
2006-07-04 6:09 ` Avi Kivity
2006-07-04 7:02 ` Neil Brown
2006-07-04 8:26 ` Avi Kivity
2006-07-05 11:56 ` Bill Davidsen
2006-07-05 12:06 ` Bill Davidsen
2006-07-05 12:19 ` Avi Kivity
2006-07-08 17:54 ` Bill Davidsen
2006-07-04 8:17 ` Alan Cox
2006-07-04 11:08 ` Thomas Glanzmann
2006-07-04 11:19 ` Krzysztof Halasa
2006-07-04 12:49 ` Helge Hafting
2006-07-05 12:01 ` Bill Davidsen
2006-07-05 12:10 ` Avi Kivity
2006-07-08 18:02 ` Bill Davidsen
2006-07-06 0:36 ` Blatant layering violations (was Re: ext4 features) Valerie Henson
2006-07-06 12:15 ` Xavier Bestel
2006-07-06 17:06 ` Valdis.Kletnieks
2006-07-06 20:02 ` Tom Vier
2006-07-03 21:34 ` ext4 features Bill Davidsen
2006-07-03 21:50 ` Valdis.Kletnieks
2006-07-03 22:04 ` Bruce Ferrell
2006-07-04 14:48 ` Valdis.Kletnieks
2006-07-03 23:00 ` Bill Davidsen
2006-07-04 15:01 ` Valdis.Kletnieks
2006-07-05 2:40 ` Bill Davidsen
2006-07-05 2:47 ` Valdis.Kletnieks
2006-07-04 12:52 ` Helge Hafting
2006-07-06 15:12 ` Ric Wheeler
2006-07-06 17:05 ` Krzysztof Halasa
2006-07-06 17:27 ` Ric Wheeler
2006-07-06 20:52 ` Valdis.Kletnieks
2006-07-07 17:41 ` Krzysztof Halasa
2006-07-07 17:34 ` Krzysztof Halasa
2006-07-04 1:02 ` Theodore Tso
2006-07-04 19:16 ` Thomas Glanzmann
2006-07-04 19:30 ` Valdis.Kletnieks
2006-07-05 12:24 ` Bill Davidsen
2006-07-05 12:59 ` J. Bruce Fields
2006-07-05 13:17 ` Pádraig Brady
2006-07-05 19:33 ` Trond Myklebust
2006-07-05 21:22 ` Bill Davidsen
2006-07-05 21:42 ` Trond Myklebust
2006-07-08 21:04 ` Bill Davidsen
2006-07-10 20:08 ` Trond Myklebust
2006-07-10 22:37 ` Bill Davidsen
2006-07-11 2:36 ` Trond Myklebust
2006-07-21 3:10 ` Bill Davidsen
2006-07-21 12:06 ` Trond Myklebust
2006-07-21 14:36 ` Theodore Tso
2006-07-21 19:02 ` Trond Myklebust
2006-07-22 12:25 ` Theodore Tso
2006-07-05 21:12 ` Bill Davidsen
2006-07-05 21:27 ` linux-os (Dick Johnson)
2006-07-05 21:41 ` J. Bruce Fields
2006-07-06 2:32 ` Bill Davidsen
2006-07-06 2:42 ` Nigel Cunningham
2006-07-06 12:43 ` Trond Myklebust
2006-07-07 2:15 ` Bill Davidsen
2006-07-07 2:30 ` Trond Myklebust
2006-07-07 2:42 ` Ric Wheeler
2006-07-07 2:46 ` Trond Myklebust
2006-07-07 3:16 ` Bill Davidsen
2006-07-07 8:09 ` Bernd Petrovitsch
2006-07-07 14:56 ` Trond Myklebust [this message]
2006-07-07 19:52 ` Theodore Tso
2006-07-05 14:04 ` Avi Kivity
2006-07-04 14:36 ` Andi Kleen
2006-07-04 14:43 ` Thomas Glanzmann
[not found] <6tVcC-1e1-79@gated-at.bofh.it>
[not found] ` <6tVcC-1e1-81@gated-at.bofh.it>
[not found] ` <6tVcC-1e1-83@gated-at.bofh.it>
[not found] ` <6tWib-2Ly-7@gated-at.bofh.it>
[not found] ` <6uDdv-7bs-3@gated-at.bofh.it>
[not found] ` <6uDGF-7Nj-47@gated-at.bofh.it>
[not found] ` <6uDQb-8e8-9@gated-at.bofh.it>
[not found] ` <6uDQb-8e8-13@gated-at.bofh.it>
[not found] ` <6uE9y-d1-1@gated-at.bofh.it>
[not found] ` <6uPom-87W-23@gated-at.bofh.it>
2006-07-04 12:28 ` Bodo Eggert
2006-07-04 15:32 ` Valdis.Kletnieks
[not found] ` <6uEMp-1gr-41@gated-at.bofh.it>
[not found] ` <6uUo2-6SN-5@gated-at.bofh.it>
[not found] ` <6uW6v-15i-19@gated-at.bofh.it>
[not found] ` <6vfLY-4K5-33@gated-at.bofh.it>
2006-07-05 22:40 ` Bodo Eggert
[not found] ` <6uXYv-3RG-1@gated-at.bofh.it>
[not found] ` <6veG8-350-7@gated-at.bofh.it>
[not found] ` <6vfiU-465-13@gated-at.bofh.it>
[not found] ` <6vmNk-77r-23@gated-at.bofh.it>
[not found] ` <6vnq7-7Tw-55@gated-at.bofh.it>
[not found] ` <6vrN0-5Se-9@gated-at.bofh.it>
[not found] ` <6vBsY-38p-9@gated-at.bofh.it>
2006-07-07 9:38 ` Bodo Eggert
2006-07-07 14:37 ` Trond Myklebust
2006-07-09 9:50 ` Bodo Eggert
2006-07-08 2:22 Chuck Ebbert
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