From: Anthony Liguori <anthony@codemonkey.ws>
To: Christoph Hellwig <hch@lst.de>
Cc: Kevin Wolf <kwolf@redhat.com>,
Ananth Narayan <ananth@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
Prerna Saxena <prerna@linux.vnet.ibm.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime.
Date: Tue, 01 Mar 2011 14:13:45 -0500 [thread overview]
Message-ID: <4D6D4569.8070502@codemonkey.ws> (raw)
In-Reply-To: <20110301125036.GA29715@lst.de>
On 03/01/2011 07:50 AM, Christoph Hellwig wrote:
> On Tue, Mar 01, 2011 at 12:48:34PM +0000, Stefan Hajnoczi wrote:
>
>> On Tue, Mar 01, 2011 at 01:42:54PM +0100, Christoph Hellwig wrote:
>>
>>> I have patches to do that, and to allow changing O_DIRECT via a monitor
>>> command, but to toggle O_SYNC via fcntl I first need to get a kernel
>>> patch in as that's currently not allowed to be changed at runtime.
>>>
>> Great it sounds like you have already implemented the two cases (guest wce and
>> host O_DIRECT) that we're talking about.
>>
> At least in theory. And for Linux I can add setting/clearing of O_SYNC
> via fcntl easily, but what do we do for other hosts?
To start with, we can just fail the command at the QMP level.
> I'm not sure
> closing/reopening the backing file is easily feasible.
>
Regards,
Anthony Liguori
next prev parent reply other threads:[~2011-03-01 19:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-28 11:49 [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime Prerna Saxena
2011-02-28 12:07 ` [Qemu-devel] [RFC][PATCH 1/2] Add monitor command 'set-cache' to change cache settings for a block device Prerna Saxena
2011-02-28 12:11 ` [Qemu-devel] [RFC][PATCH 2/2] Extend monitor command 'info block' to display cache settings for block devices Prerna Saxena
2011-02-28 15:15 ` Kevin Wolf
2011-02-28 15:12 ` [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime Kevin Wolf
2011-02-28 15:35 ` Stefan Hajnoczi
2011-02-28 15:48 ` Kevin Wolf
2011-03-01 9:55 ` Stefan Hajnoczi
2011-03-01 10:06 ` Kevin Wolf
2011-03-01 15:02 ` Chunqiang Tang
2011-03-01 13:03 ` Anthony Liguori
2011-03-01 13:22 ` Kevin Wolf
2011-03-01 15:47 ` Anthony Liguori
2011-03-01 12:42 ` Christoph Hellwig
2011-03-01 12:48 ` Stefan Hajnoczi
2011-03-01 12:50 ` Christoph Hellwig
2011-03-01 19:13 ` Anthony Liguori [this message]
2011-03-02 7:57 ` Kevin Wolf
2011-03-01 12:52 ` Kevin Wolf
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