Re: [PATCH v2 2/6] block: truncate: Don't make backing file data visible

[Alberto Garcia]

On Thu 21 Nov 2019 03:33:31 PM CET, Kevin Wolf wrote:
> For commit it's an image corruptor. For resize, I'll admit that it's
> just wrong behaviour that is probably harmless in most cases, but it's
> still wrong behaviour. It would be a corruptor in the same way as
> commit if it allowed resizing intermediate nodes, but I _think_ the
> old-style op blockers still forbid this. We'd have to double-check
> this if we leave things broken for block_resize.

I tried but cannot make block_resize touch an intermediate image:

    if (!bdrv_is_first_non_filter(bs)) {
        error_setg(errp, QERR_FEATURE_DISABLED, "resize");
        goto out;
    }

Berto