Re: [Xen-devel] [PATCH 5 of 5] blkif.h: Define and document the request number/size/segments extension

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 08/02/2012 22:22, "Justin T. Gibbs" <justing@xxxxxxxxxxxxxxxx> wrote:

> The versioning required allows a driver to declare, "I am compatible
> with any source compatibility breaking changes up to version X of
> the header file".  Declaring support for the latest version does
> not require that a driver implement the new extensions.  Just one
> constant needs to be renamed.  So I don't see this as really altering
> the interface between front and backends (i.e. it is not a "blkif2")
> 
> If the xen-compat.h behavior is that you can safely import the
> public headers so long as you do not bump __XEN_INTERFACE_VERSION__
> until after you have audited and adjusted for the #ifdef guarded
> changes in the header files, then that is exactly what is needed
> in blkif.h.

That's what XEN_INTERFACE_VERSION is for, yes.

 -- Keir



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