Re: [Qemu-block] [PATCH 2/2] qapi: deprecate implicit filters

[Kevin Wolf]

Am 23.08.2019 um 11:22 hat Vladimir Sementsov-Ogievskiy geschrieben:
> 14.08.2019 13:07, Vladimir Sementsov-Ogievskiy wrote:
> > To get rid of implicit filters related workarounds in future let's
> > deprecate them now.
> 
> Interesting, could we deprecate implicit filter without deprecation of
> unnecessity of parameter? As actually, it's good when this parameter
> is not necessary, in most cases user is not interested in node-name.

A modern client is supposed to be interested in node-names. We basically
expect it to manage the whole block graph at a node level, so it should
certainly make sure to know the node-name of every node. It will need it
to take snapshots, insert filter drivers or anything like this on top of
the implicit node.

So once we make the option mandatory (which means returning an error for
legacy clients that don't do node-level management), I don't see a good
reason to ever make it optional again.

Kevin