On 02.11.2015 13:15, Alberto Garcia wrote:
> This addresses scenarios like this one:
>
> { 'execute': 'blockdev-add', 'arguments':
> { 'options': { 'driver': 'qcow2',
> 'node-name': 'new0',
> 'file': { 'driver': 'file',
> 'filename': 'new.qcow2',
> 'node-name': 'file0' } } } }
>
> { 'execute': 'blockdev-snapshot', 'arguments':
> { 'node': 'virtio0',
> 'overlay': 'file0' } }
>
> Signed-off-by: Alberto Garcia <[email protected]>
> ---
> blockdev.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/blockdev.c b/blockdev.c
> index a567a05..2774bf5 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -1667,6 +1667,11 @@ static void
> external_snapshot_prepare(BlkTransactionState *common,
>
> if (state->new_bs->backing != NULL) {
> error_setg(errp, "The snapshot already has a backing image");
> + return;
This is...
> + }
> +
> + if (!state->new_bs->drv->supports_backing) {
> + error_setg(errp, "The snapshot does not support backing images");
...why a return statement might be good here, too.
With or without:
Reviewed-by: Max Reitz <[email protected]>
> }
> }
>
>
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