Hi all,
I'm currently looking into adding a return value to qemu's bdrv_flush
function and I noticed that your block drivers (nbd, rbd and sheepdog)
don't implement bdrv_flush at all. bdrv_flush is going to return
-ENOTSUP for any block driver not implementing this, effectively
breaking these thre
On 10/21/2010 09:07 AM, Kevin Wolf wrote:
Hi all,
I'm currently looking into adding a return value to qemu's bdrv_flush
function and I noticed that your block drivers (nbd, rbd and sheepdog)
don't implement bdrv_flush at all. bdrv_flush is going to return
-ENOTSUP for any block driver not implem
Le jeudi 21 octobre 2010 à 10:07 -0500, Anthony Liguori a écrit :
> On 10/21/2010 09:07 AM, Kevin Wolf wrote:
> > Hi all,
> >
> > I'm currently looking into adding a return value to qemu's bdrv_flush
> > function and I noticed that your block drivers (nbd, rbd and sheepdog)
> > don't implement bdrv
At Thu, 21 Oct 2010 16:07:28 +0200,
Kevin Wolf wrote:
>
> Hi all,
>
> I'm currently looking into adding a return value to qemu's bdrv_flush
> function and I noticed that your block drivers (nbd, rbd and sheepdog)
> don't implement bdrv_flush at all. bdrv_flush is going to return
> -ENOTSUP for an
Am 21.10.2010 21:32, schrieb Laurent Vivier:
> Le jeudi 21 octobre 2010 à 10:07 -0500, Anthony Liguori a écrit :
>> On 10/21/2010 09:07 AM, Kevin Wolf wrote:
>>> Hi all,
>>>
>>> I'm currently looking into adding a return value to qemu's bdrv_flush
>>> function and I noticed that your block drivers
Am 22.10.2010 07:43, schrieb MORITA Kazutaka:
> At Thu, 21 Oct 2010 16:07:28 +0200,
> Kevin Wolf wrote:
>>
>> Hi all,
>>
>> I'm currently looking into adding a return value to qemu's bdrv_flush
>> function and I noticed that your block drivers (nbd, rbd and sheepdog)
>> don't implement bdrv_flush a
On 10/22/2010 03:29 AM, Kevin Wolf wrote:
I agree.
Of course, as Laurent said a while ago, there is no specification for
NBD, so it's hard to say what the intended semantics is.
However, I did have a look at the nbdserver code and it looks as if it
implements something similar to writethr
Am 22.10.2010 14:58, schrieb Anthony Liguori:
> On 10/22/2010 03:29 AM, Kevin Wolf wrote:
>>> I agree.
>>>
>> Of course, as Laurent said a while ago, there is no specification for
>> NBD, so it's hard to say what the intended semantics is.
>>
>> However, I did have a look at the nbdserver cod
On 10/22/2010 08:35 AM, Kevin Wolf wrote:
Am 22.10.2010 14:58, schrieb Anthony Liguori:
On 10/22/2010 03:29 AM, Kevin Wolf wrote:
I agree.
Of course, as Laurent said a while ago, there is no specification for
NBD, so it's hard to say what the intended semantics is.
Howeve
On 10/22/2010 08:57 AM, Kevin Wolf wrote:
Am 22.10.2010 15:45, schrieb Anthony Liguori:
On a physical system, if you don't have a battery backed disk and you
enable the WC on your disk, then even with cache=writethrough we're unsafe.
I don't think that's right. O_SYNC should guar
Am 22.10.2010 15:45, schrieb Anthony Liguori:
>>> On a physical system, if you don't have a battery backed disk and you
>>> enable the WC on your disk, then even with cache=writethrough we're unsafe.
>>>
>> I don't think that's right. O_SYNC should guarantee that the volatile
>> disk cache is
At Fri, 22 Oct 2010 10:47:44 +0200,
Kevin Wolf wrote:
>
> Am 22.10.2010 07:43, schrieb MORITA Kazutaka:
> > At Thu, 21 Oct 2010 16:07:28 +0200,
> > Kevin Wolf wrote:
> >>
> >> Hi all,
> >>
> >> I'm currently looking into adding a return value to qemu's bdrv_flush
> >> function and I noticed that y
warded message --
>> From: Kevin Wolf
>> Date: 2010/10/21
>> Subject: [Qemu-devel] bdrv_flush for qemu block drivers nbd, rbd and sheepdog
>> To: Christian Brunner , Laurent Vivier
>> , MORITA Kazutaka
>> Cc: Qemu-devel@nongnu.org
>>
>>
>
oblem, though, so it's your decision if you want to implement it.
So is a bdrv_flush generated when e.g. the guest filesystem issues a
barrier, or would otherwise normally ask a SATA disk to flush it's cache?
sage
> Kevin
>
> >> -- Forwarded message
Am 22.10.2010 18:22, schrieb Sage Weil:
> On Fri, 22 Oct 2010, Kevin Wolf wrote:
>> [ Adding qemu-devel to CC again ]
>>
>> Am 21.10.2010 20:59, schrieb Sage Weil:
>>> On Thu, 21 Oct 2010, Christian Brunner wrote:
Hi,
is there a flush operation in librados? - I guess the only way to
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