Re: [PATCH v3 4/4] io_uring: add support for zone-append

[Christoph Hellwig]

On Thu, Jul 09, 2020 at 12:50:27PM -0600, Jens Axboe wrote:
> It might, if you have IRQ context for the completion. task_work isn't
> expensive, however. It's not like a thread offload.
> 
> > Using flags have not been liked here, but given the upheaval involved so
> > far I have begun to feel - it was keeping things simple. Should it be
> > reconsidered?
> 
> It's definitely worth considering, especially since we can use cflags
> like Pavel suggested upfront and not need any extra storage. But it
> brings us back to the 32-bit vs 64-bit discussion, and then using blocks
> instead of bytes. Which isn't exactly super pretty.

block doesn't work for the case of writes to files that don't have
to be aligned in any way.  And that I think is the more broadly
applicable use case than zone append on block devices.