Re: [Qemu-block] [PATCH v7 for-2.12 19/25] block: Add BlockDriver.bdrv_gather_child_options

[Alberto Garcia]

On Mon 20 Nov 2017 09:09:58 PM CET, Max Reitz wrote:
> Some follow-up patches will rework the way bs->full_open_options is
> refreshed in bdrv_refresh_filename(). The new implementation will remove
> the need for the block drivers' bdrv_refresh_filename() implementations
> to set bs->full_open_options; instead, it will be generic and use static
> information from each block driver.
>
> However, by implementing bdrv_gather_child_options(), block drivers will
> still be able to override the way the full_open_options of their
> children are incorporated into their own.
>
> We need to implement this function for VMDK because we have to prevent
> the generic implementation from gathering the options of all children:
> It is not possible to specify options for the extents through the
> runtime options.
>
> For quorum, the child names that would be used by the generic
> implementation and the ones that we actually (currently) want to use
> differ. See quorum_gather_child_options() for more information.
>
> Note that both of these are cases which are not ideal: In case of VMDK
> it would probably be nice to be able to specify options for all extents.
> In case of quorum, the current runtime option structure is simply broken
> and needs to be fixed (but that is left for another patch).
>
> Signed-off-by: Max Reitz <address@hidden>

Reviewed-by: Alberto Garcia <address@hidden>

Berto