Re: [PATCH v2 11/15] blktrace: add block trace commands for zone operations

On Thu, Oct 09, 2025 at 11:17:21AM +0000, Johannes Thumshirn wrote:
> On 10/8/25 8:14 AM, hch wrote:
> > On Tue, Oct 07, 2025 at 01:08:00PM +0000, Johannes Thumshirn wrote:
> >> Sure for the old commands everything is still in the lower 32bits, this
> >> has the nice property that we don't need to duplicate all the code for
> >> v1 and v2.
> > I don't think you need to duplicate anything, just have a little
> > function that maps from the free-form v2 commands and flags to the
> > v1 field.  Preferably including a mapping of all unsupported ones to
> > a catchall unsupported command and flag each to indicate that the
> > trace includes something only visible with v2.
> 
> So I've tried making a translation function (which is the trivial part) 
> but then it's a game of whack-a-mole to unbreak compilation, ftrace, etc..

What's the problem?

> I think it's not really worth the effort.

Why?  We really want a clean slate going forward.  Creating a permanent
split into legacy vs new commands seems very unfortunate.