Re: [Qemu-devel] [PATCH 2/2] block: track dirty flag status in qed

[Stefan Hajnoczi]

On Sat, Dec 31, 2011 at 9:06 AM, Dong Xu Wang
<address@hidden> wrote:
> +static int bdrv_qed_is_dirty(BlockDriverState *bs)
> +{
> +    BDRVQEDState *s = bs->opaque;
> +    return s->header.features & QED_F_NEED_CHECK;
> +}

Looks good.

Note that the image will be checked and then QED_F_NEED_CHECK is
cleared when the image is opened for read/write.  So the flag is only
reported if the image was opened read-only, or if we're writing to the
image and it allocated new clusters recently.

Stefan