[PATCH v9 06/11] io_uring: introduce attributes for read/write and PI support

[Christoph Hellwig]

On Thu, Nov 14, 2024 at 01:09:44PM +0000, Pavel Begunkov wrote:
>> Eww.  I know it's frustration for your if maintainers give contradicting
>> guidance, but this is really an awful interface.  Not only the pointless
>
> Because once you placed it at a fixed location nothing realistically
> will be able to reuse it. Not everyone will need PI, but the assumption
> that there will be more more additional types of attributes / parameters.

So?  If we have a strong enough requirement for something else we
can triviall add another opcode.  Maybe we should just add different
opcodes for read/write with metadata so that folks don't freak out
about this?

> With SQE128 it's also a problem that now all SQEs are 128 bytes regardless
> of whether a particular request needs it or not, and the user will need
> to zero them for each request.

The user is not going to create a SQE128 ring unless they need to,
so this seem like a bit of an odd objection.