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Re: [Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 sp
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specification |
Date: |
Thu, 26 Jul 2012 14:57:20 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 25.07.2012 14:21, schrieb Stefan Hajnoczi:
> The lazy refcounts bit indicates that this image can take advantage of
> the dirty bit and that refcount updates can be postponed.
>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> docs/specs/qcow2.txt | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
> index 339cdc1..f2f4faa 100644
> --- a/docs/specs/qcow2.txt
> +++ b/docs/specs/qcow2.txt
> @@ -86,7 +86,12 @@ in the description of a field.
> Bitmask of compatible features. An implementation can
> safely ignore any unknown bits that are set.
>
> - Bits 0-63: Reserved (set to 0)
> + Bit 0: Lazy refcounts bit. If this bit is set then
> + lazy refcount updates can be used. This
> means
> + postponing marking the image file dirty and
Not sure what was intended here, but the dirty flag isn't set anywhere
yet, so you can't postpone it either. Maybe s/postponing//?
> + postponing refcount metadata updates.
> +
> + Bits 1-63: Reserved (set to 0)
>
> 88 - 95: autoclear_features
> Bitmask of auto-clear features. An implementation may
> only
Kevin
- Re: [Qemu-devel] [PATCH v2 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test, (continued)
[Qemu-devel] [PATCH v2 2/7] qcow2: introduce dirty bit, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 4/7] qemu-iotests: ignore qemu-img create lazy_refcounts output, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 6/7] qemu-io: add "abort" command to simulate program crash, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 1/7] docs: add dirty bit to qcow2 specification, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specification, Stefan Hajnoczi, 2012/07/25
- Re: [Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specification,
Kevin Wolf <=