Re: [Qemu-devel] [PATCH 09/24] qcow2: add .bdrv_load_autoloading_dirty_bitmaps

[Max Reitz]

On 23.01.2017 13:10, Vladimir Sementsov-Ogievskiy wrote:
> Auto loading bitmaps are bitmaps in Qcow2, with the AUTO flag set. They
> are loaded when the image is opened and become BdrvDirtyBitmaps for the
> corresponding drive.
> 
> Extra data in bitmaps is not supported for now.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
>  block/Makefile.objs  |   2 +-
>  block/qcow2-bitmap.c | 712 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  block/qcow2.c        |   2 +
>  block/qcow2.h        |   3 +
>  4 files changed, 718 insertions(+), 1 deletion(-)
>  create mode 100644 block/qcow2-bitmap.c

[...]

> new file mode 100644
> index 0000000000..758622dcfc
> --- /dev/null
> +++ b/block/qcow2-bitmap.c

[...]

> +
> +/*
> + * Bitmap List end
> + */
> +
> +static int update_ext_header_and_dir_in_place(BlockDriverState *bs,
> +                                              Qcow2BitmapList *bm_list)
> +{
> +    BDRVQcow2State *s = bs->opaque;
> +    int ret;
> +
> +    if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS) ||
> +        bm_list == NULL || QSIMPLEQ_EMPTY(bm_list) ||
> +        bitmap_list_count(bm_list) != s->nb_bitmaps)
> +    {
> +        return -EINVAL;
> +    }
> +
> +    s->autoclear_features &= ~(uint64_t)QCOW2_AUTOCLEAR_BITMAPS;
> +    ret = update_header_sync(bs);

This function is defined only in patch 13, until then the code won't
compile; the definition should be moved into this patch.

Max

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