From: Joel Becker <jlbec@evilplan.org>
To: Amir Goldstein <amir73il@gmail.com>
Cc: Theodore Tso <tytso@mit.edu>, Ric Wheeler <ricwheeler@gmail.com>,
Dave Chinner <david@fromorbit.com>,
lsf@lists.linux-foundation.org,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
device-mapper development <dm-devel@redhat.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Ric Wheeler <rwheeler@redhat.com>,
Yongqiang Yang <xiaoqiangnk@gmail.com>
Subject: Re: [Lsf] Preliminary Agenda and Activities for LSF
Date: Fri, 1 Apr 2011 14:46:52 -0700 [thread overview]
Message-ID: <20110401214652.GC25355@noexit> (raw)
In-Reply-To: <AANLkTinZCx3gq-iDjPLzkvSFQNqAc1-bGN8xgzRz_=yj@mail.gmail.com>
On Fri, Apr 01, 2011 at 09:30:04AM -0700, Amir Goldstein wrote:
> when writing DIO to indirect mapped file holes, we fall back to buffered write
> (so we won't expose stale data in the case of a crash) concurrent DIO reads
> to that file (before data writeback) can expose stale data. right?
> do you consider this case mixing buffered and DIO access?
> do you consider that as a problem?
I do not consider this 'mixing', nor do I consider it a problem.
ocfs2 does exactly this for holes, unwritten extents, and CoW. It does
not violate the user's expectation that the data will be on disk when
the write(2) returns.
Falling back to buffered on read(2) is a different story; the
caller wants the current state of the disk block, not five minutes ago.
So we can't do that. But we also don't need to.
O_DIRECT users that are worried about any possible space usage in
the page cache have already pre-allocated their disk blocks and don't
get here.
Joel
--
"Under capitalism, man exploits man. Under Communism, it's just
the opposite."
- John Kenneth Galbraith
http://www.jlbec.org/
jlbec@evilplan.org
next prev parent reply other threads:[~2011-04-01 21:47 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1301373398.2590.20.camel@mulgrave.site>
2011-03-29 5:14 ` [Lsf] Preliminary Agenda and Activities for LSF Amir Goldstein
2011-03-29 11:16 ` Ric Wheeler
2011-03-29 11:22 ` Matthew Wilcox
2011-03-29 12:17 ` Jens Axboe
2011-03-29 13:09 ` Martin K. Petersen
2011-03-29 13:12 ` Ric Wheeler
2011-03-29 13:38 ` James Bottomley
2011-03-29 17:20 ` Shyam_Iyer
2011-03-29 17:33 ` Vivek Goyal
2011-03-29 18:10 ` Shyam_Iyer
2011-03-29 18:45 ` Vivek Goyal
2011-03-29 19:13 ` Shyam_Iyer
2011-03-29 19:57 ` Vivek Goyal
2011-03-29 19:59 ` Mike Snitzer
2011-03-29 20:12 ` Shyam_Iyer
2011-03-29 20:23 ` Mike Snitzer
2011-03-29 23:09 ` Shyam_Iyer
2011-03-30 5:58 ` [Lsf] " Hannes Reinecke
2011-03-30 14:02 ` James Bottomley
2011-03-30 14:10 ` Hannes Reinecke
2011-03-30 14:26 ` James Bottomley
2011-03-30 14:55 ` Hannes Reinecke
2011-03-30 15:33 ` James Bottomley
2011-03-30 15:46 ` Shyam_Iyer
2011-03-30 20:32 ` Giridhar Malavali
2011-03-30 20:45 ` James Bottomley
2011-03-29 19:47 ` Nicholas A. Bellinger
2011-03-29 20:29 ` Jan Kara
2011-03-29 20:31 ` Ric Wheeler
2011-03-30 0:33 ` Mingming Cao
2011-03-30 2:17 ` Dave Chinner
2011-03-30 11:13 ` Theodore Tso
2011-03-30 11:28 ` Ric Wheeler
2011-03-30 14:07 ` Chris Mason
2011-04-01 15:19 ` Ted Ts'o
2011-04-01 16:30 ` Amir Goldstein
2011-04-01 21:46 ` Joel Becker [this message]
2011-04-02 3:26 ` Amir Goldstein
2011-04-01 21:43 ` Joel Becker
2011-03-30 21:49 ` Mingming Cao
2011-03-31 0:05 ` Matthew Wilcox
2011-03-31 1:00 ` Joel Becker
2011-04-01 21:34 ` Mingming Cao
2011-04-01 21:49 ` Joel Becker
2011-03-29 17:35 ` Chad Talbott
2011-03-29 19:09 ` Vivek Goyal
2011-03-29 20:14 ` Chad Talbott
2011-03-29 20:35 ` Jan Kara
2011-03-29 21:08 ` Greg Thelen
2011-03-30 4:18 ` Dave Chinner
2011-03-30 15:37 ` IO less throttling and cgroup aware writeback (Was: Re: [Lsf] Preliminary Agenda and Activities for LSF) Vivek Goyal
2011-03-30 22:20 ` Dave Chinner
2011-03-30 22:49 ` Chad Talbott
2011-03-31 3:00 ` Dave Chinner
2011-03-31 14:16 ` Vivek Goyal
2011-03-31 14:34 ` Chris Mason
2011-03-31 22:14 ` Dave Chinner
2011-03-31 23:43 ` Chris Mason
2011-04-01 0:55 ` Dave Chinner
2011-04-01 1:34 ` Vivek Goyal
2011-04-01 4:36 ` Dave Chinner
2011-04-01 6:32 ` [Lsf] IO less throttling and cgroup aware writeback (Was: " Christoph Hellwig
2011-04-01 7:23 ` Dave Chinner
2011-04-01 12:56 ` Christoph Hellwig
2011-04-21 15:07 ` Vivek Goyal
2011-04-01 14:49 ` IO less throttling and cgroup aware writeback (Was: Re: [Lsf] " Vivek Goyal
2011-03-31 22:25 ` Vivek Goyal
2011-03-31 14:50 ` [Lsf] IO less throttling and cgroup aware writeback (Was: " Greg Thelen
2011-03-31 22:27 ` Dave Chinner
2011-04-01 17:18 ` Vivek Goyal
2011-04-01 21:49 ` Dave Chinner
2011-04-02 7:33 ` Greg Thelen
2011-04-02 7:34 ` Greg Thelen
2011-04-05 13:13 ` Vivek Goyal
2011-04-05 22:56 ` Dave Chinner
2011-04-06 14:49 ` Curt Wohlgemuth
2011-04-06 15:39 ` Vivek Goyal
2011-04-06 19:49 ` Greg Thelen
2011-04-06 23:07 ` [Lsf] IO less throttling and cgroup aware writeback Greg Thelen
2011-04-06 23:36 ` Dave Chinner
2011-04-07 19:24 ` Vivek Goyal
2011-04-07 20:33 ` Christoph Hellwig
2011-04-07 21:34 ` Vivek Goyal
2011-04-07 23:42 ` Dave Chinner
2011-04-08 0:59 ` Greg Thelen
2011-04-08 1:25 ` Dave Chinner
2011-04-12 3:17 ` KAMEZAWA Hiroyuki
2011-04-08 13:43 ` Vivek Goyal
2011-04-06 23:08 ` [Lsf] IO less throttling and cgroup aware writeback (Was: Re: Preliminary Agenda and Activities for LSF) Dave Chinner
2011-04-07 20:04 ` Vivek Goyal
2011-04-07 23:47 ` Dave Chinner
2011-04-08 13:50 ` Vivek Goyal
2011-04-11 1:05 ` Dave Chinner
2011-04-06 15:37 ` Vivek Goyal
2011-04-06 16:08 ` Vivek Goyal
2011-04-06 17:10 ` Jan Kara
2011-04-06 17:14 ` Curt Wohlgemuth
2011-04-08 1:58 ` Dave Chinner
2011-04-19 14:26 ` Wu Fengguang
2011-04-06 23:50 ` Dave Chinner
2011-04-07 17:55 ` Vivek Goyal
2011-04-11 1:36 ` Dave Chinner
2011-04-15 21:07 ` Vivek Goyal
2011-04-16 3:06 ` Vivek Goyal
2011-04-18 21:58 ` Jan Kara
2011-04-18 22:51 ` cgroup IO throttling and filesystem ordered mode (Was: Re: [Lsf] IO less throttling and cgroup aware writeback (Was: Re: Preliminary Agenda and Activities for LSF)) Vivek Goyal
2011-04-19 0:33 ` Dave Chinner
2011-04-19 14:30 ` Vivek Goyal
2011-04-19 14:45 ` Jan Kara
2011-04-19 17:17 ` Vivek Goyal
2011-04-19 18:30 ` Vivek Goyal
2011-04-21 0:32 ` Dave Chinner
2011-04-21 0:29 ` Dave Chinner
2011-04-19 14:17 ` [Lsf] IO less throttling and cgroup aware writeback (Was: Re: Preliminary Agenda and Activities for LSF) Wu Fengguang
2011-04-19 14:34 ` Vivek Goyal
2011-04-19 14:48 ` Jan Kara
2011-04-19 15:11 ` Vivek Goyal
2011-04-19 15:22 ` Wu Fengguang
2011-04-19 15:31 ` Vivek Goyal
2011-04-19 16:58 ` Wu Fengguang
2011-04-19 17:05 ` Vivek Goyal
2011-04-19 20:58 ` Jan Kara
2011-04-20 1:21 ` Wu Fengguang
2011-04-20 10:56 ` Jan Kara
2011-04-20 11:19 ` Wu Fengguang
2011-04-20 14:42 ` Jan Kara
2011-04-20 1:16 ` Wu Fengguang
2011-04-20 18:44 ` Vivek Goyal
2011-04-20 19:16 ` Jan Kara
2011-04-21 0:17 ` Dave Chinner
2011-04-21 15:06 ` Wu Fengguang
2011-04-21 15:10 ` Wu Fengguang
2011-04-21 17:20 ` Vivek Goyal
2011-04-22 4:21 ` Wu Fengguang
2011-04-22 15:25 ` Vivek Goyal
2011-04-22 16:28 ` Andrea Arcangeli
2011-04-25 18:19 ` Vivek Goyal
2011-04-26 14:37 ` Vivek Goyal
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