From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>, Tejun Heo <tj@kernel.org>,
Vivek Goyal <vgoyal@redhat.com>, Jan Kara <jack@suse.cz>,
jaxboe@fusionio.com, James.Bottomley@suse.de,
linux-fsdevel@vger.kernel.org, linux-scsi@vger.kernel.org,
tytso@mit.edu, chris.mason@oracle.com, swhiteho@redhat.com,
konishi.ryusuke@lab.ntt.co.jp
Subject: Re: [RFC] relaxed barrier semantics
Date: Wed, 28 Jul 2010 11:16:33 +0200 [thread overview]
Message-ID: <20100728091633.GA10219@lst.de> (raw)
In-Reply-To: <4C4FF42C.1050701@suse.de>
On Wed, Jul 28, 2010 at 11:11:08AM +0200, Hannes Reinecke wrote:
> My idea here is to use the 'META' request tag to emulate FUA.
> >From what I've seen, the META request tag is only ever used on gfs2,
> and even that is using is for tagging journal requests on write.
Please don't overload META even more, it's already overloaded with
at least two meanings.
We do in fact already have a REQ_FUA flag, and now that I have unified the
bio and request flags we can easily set it from filesystems. The problem
is to emulate it properly on devices that do no actually support the FUA bit.
Of which we unfortunately have a lot given that libata by default disables
the FUA support even if the device supports.
next prev parent reply other threads:[~2010-07-28 9:17 UTC|newest]
Thread overview: 145+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-27 16:56 [RFC] relaxed barrier semantics Christoph Hellwig
2010-07-27 17:54 ` Jan Kara
2010-07-27 18:35 ` Vivek Goyal
2010-07-27 18:42 ` James Bottomley
2010-07-27 18:51 ` Ric Wheeler
2010-07-27 19:43 ` Christoph Hellwig
2010-07-27 19:38 ` Christoph Hellwig
2010-07-28 8:08 ` Tejun Heo
2010-07-28 8:20 ` Tejun Heo
2010-07-28 13:55 ` Vladislav Bolkhovitin
2010-07-28 14:23 ` Tejun Heo
2010-07-28 14:37 ` James Bottomley
2010-07-28 14:44 ` Tejun Heo
2010-07-28 16:17 ` Vladislav Bolkhovitin
2010-07-28 16:17 ` Vladislav Bolkhovitin
2010-07-28 16:16 ` Vladislav Bolkhovitin
2010-07-28 8:24 ` Christoph Hellwig
2010-07-28 8:40 ` Tejun Heo
2010-07-28 8:50 ` Christoph Hellwig
2010-07-28 8:58 ` Tejun Heo
2010-07-28 9:00 ` Christoph Hellwig
2010-07-28 9:11 ` Hannes Reinecke
2010-07-28 9:16 ` Christoph Hellwig [this message]
2010-07-28 9:24 ` Tejun Heo
2010-07-28 9:38 ` Christoph Hellwig
2010-07-28 9:28 ` Steven Whitehouse
2010-07-28 9:35 ` READ_META semantics, was " Christoph Hellwig
2010-07-28 13:52 ` Jeff Moyer
2010-07-28 9:17 ` Tejun Heo
2010-07-28 9:28 ` Christoph Hellwig
2010-07-28 9:48 ` Tejun Heo
2010-07-28 10:19 ` Steven Whitehouse
2010-07-28 11:45 ` Christoph Hellwig
2010-07-28 12:47 ` Jan Kara
2010-07-28 23:00 ` Christoph Hellwig
2010-07-29 10:45 ` Jan Kara
2010-07-29 16:54 ` Joel Becker
2010-07-29 17:02 ` Christoph Hellwig
2010-07-29 1:44 ` Ted Ts'o
2010-07-29 2:43 ` Vivek Goyal
[not found] ` <20100729024334.GA21736@redhat.com>
2010-07-29 8:42 ` Christoph Hellwig
2010-07-29 20:02 ` Vivek Goyal
2010-07-29 20:06 ` Christoph Hellwig
2010-07-30 3:17 ` Vivek Goyal
2010-07-30 7:07 ` Christoph Hellwig
2010-07-30 7:41 ` Vivek Goyal
2010-08-02 18:28 ` [RFC PATCH] Flush only barriers (Was: Re: [RFC] relaxed barrier semantics) Vivek Goyal
2010-08-03 13:03 ` Christoph Hellwig
2010-08-04 15:29 ` Vivek Goyal
2010-08-04 16:21 ` Christoph Hellwig
[not found] ` <20100729083142.GA30077@lst.de>
2010-07-29 11:16 ` [RFC] relaxed barrier semantics Jan Kara
2010-07-29 13:00 ` extfs reliability Vladislav Bolkhovitin
2010-07-29 13:08 ` Christoph Hellwig
2010-07-29 14:12 ` Vladislav Bolkhovitin
2010-07-29 14:34 ` Jan Kara
2010-07-29 18:20 ` Vladislav Bolkhovitin
2010-07-29 18:49 ` Vladislav Bolkhovitin
2010-07-29 14:26 ` Jan Kara
2010-07-29 18:20 ` Vladislav Bolkhovitin
2010-07-29 18:58 ` Ted Ts'o
2010-07-29 19:44 ` [RFC] relaxed barrier semantics Ric Wheeler
[not found] ` <4C51DA1F.2040701@redhat.com>
2010-07-29 19:49 ` Christoph Hellwig
2010-07-29 19:56 ` Ric Wheeler
2010-07-29 19:59 ` James Bottomley
2010-07-29 20:03 ` Christoph Hellwig
2010-07-29 20:07 ` James Bottomley
2010-07-29 20:11 ` Christoph Hellwig
2010-07-30 12:45 ` Vladislav Bolkhovitin
2010-07-30 12:56 ` Christoph Hellwig
2010-08-04 1:58 ` Jamie Lokier
2010-07-30 12:46 ` Vladislav Bolkhovitin
2010-07-30 12:57 ` Christoph Hellwig
2010-07-30 13:09 ` Vladislav Bolkhovitin
2010-07-30 13:12 ` Christoph Hellwig
2010-07-30 17:40 ` Vladislav Bolkhovitin
2010-07-29 20:58 ` Ric Wheeler
2010-07-29 22:30 ` Andreas Dilger
2010-07-29 23:04 ` Ted Ts'o
2010-07-29 23:08 ` Ric Wheeler
2010-07-29 23:28 ` James Bottomley
2010-07-29 23:37 ` James Bottomley
2010-07-30 0:19 ` Ted Ts'o
2010-07-30 12:56 ` Vladislav Bolkhovitin
2010-07-30 7:11 ` Christoph Hellwig
2010-07-30 12:56 ` Vladislav Bolkhovitin
[not found] ` <4C52CBFF.6090406@vlnb.net>
2010-07-30 13:07 ` Tejun Heo
2010-07-30 13:22 ` Vladislav Bolkhovitin
2010-07-30 13:27 ` Vladislav Bolkhovitin
2010-07-30 13:09 ` Christoph Hellwig
2010-07-30 13:25 ` Vladislav Bolkhovitin
2010-07-30 13:34 ` Christoph Hellwig
2010-07-30 13:44 ` Vladislav Bolkhovitin
2010-07-30 14:20 ` Christoph Hellwig
2010-07-31 0:47 ` Jan Kara
2010-07-31 9:12 ` Christoph Hellwig
2010-08-02 13:14 ` Jan Kara
2010-08-02 10:38 ` Vladislav Bolkhovitin
2010-08-02 12:48 ` Christoph Hellwig
2010-08-02 19:03 ` xfs rm performance Vladislav Bolkhovitin
2010-08-02 19:18 ` Christoph Hellwig
2010-08-05 19:31 ` Vladislav Bolkhovitin
2010-08-02 19:01 ` [RFC] relaxed barrier semantics Vladislav Bolkhovitin
2010-08-02 19:26 ` Christoph Hellwig
2010-07-31 0:35 ` Jan Kara
2010-08-02 16:47 ` Ryusuke Konishi
2010-08-02 17:39 ` Chris Mason
2010-08-05 13:11 ` Vladislav Bolkhovitin
[not found] ` <4C5AB89C.5080700@vlnb.net>
2010-08-05 13:32 ` Chris Mason
2010-08-05 14:52 ` Hannes Reinecke
[not found] ` <4C5AD01F.2060602@suse.de>
2010-08-05 15:17 ` Chris Mason
2010-08-05 17:07 ` Christoph Hellwig
2010-08-05 19:48 ` Vladislav Bolkhovitin
2010-08-05 19:50 ` Christoph Hellwig
2010-08-05 20:05 ` Vladislav Bolkhovitin
2010-08-06 14:56 ` Hannes Reinecke
2010-08-06 18:38 ` Vladislav Bolkhovitin
2010-08-06 23:38 ` Christoph Hellwig
2010-08-06 23:34 ` Christoph Hellwig
2010-08-05 17:09 ` Christoph Hellwig
2010-08-05 19:32 ` Vladislav Bolkhovitin
2010-08-05 19:40 ` Christoph Hellwig
2010-07-28 13:56 ` Vladislav Bolkhovitin
2010-07-28 14:42 ` Vivek Goyal
2010-07-27 19:37 ` Christoph Hellwig
2010-08-03 18:49 ` [PATCH, RFC 1/2] relaxed cache flushes Christoph Hellwig
2010-08-03 18:51 ` [PATCH, RFC 2/2] dm: support REQ_FLUSH directly Christoph Hellwig
2010-08-04 4:57 ` Kiyoshi Ueda
2010-08-04 8:54 ` Christoph Hellwig
2010-08-05 2:16 ` Jun'ichi Nomura
2010-08-26 22:50 ` Mike Snitzer
2010-08-27 0:40 ` Mike Snitzer
2010-08-27 1:20 ` Jamie Lokier
2010-08-27 1:43 ` Jun'ichi Nomura
2010-08-27 4:08 ` Mike Snitzer
2010-08-27 5:52 ` Jun'ichi Nomura
2010-08-27 14:13 ` Mike Snitzer
2010-08-30 4:45 ` Jun'ichi Nomura
2010-08-30 8:33 ` Tejun Heo
2010-08-30 12:43 ` Mike Snitzer
2010-08-30 12:45 ` Tejun Heo
2010-08-06 16:04 ` [PATCH, RFC] relaxed barriers Tejun Heo
2010-08-06 23:34 ` Christoph Hellwig
2010-08-07 10:13 ` [PATCH REPOST " Tejun Heo
2010-08-08 14:31 ` Christoph Hellwig
2010-08-09 14:50 ` Tejun Heo
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