[PATCH v3 04/10] block: introduce dma map backed bio type

[Pavel Begunkov]

On 5/20/26 09:30, Christoph Hellwig wrote:
> On Mon, May 18, 2026 at 11:29:54AM +0100, Pavel Begunkov wrote:
>>>>    	BIO_ZONE_WRITE_PLUGGING, /* bio handled through zone write plugging */
>>>>    	BIO_EMULATES_ZONE_APPEND, /* bio emulates a zone append operation */
>>>> +	BIO_DMABUF_MAP, /* Using premmaped dma buffers */
>>>
>>> Shouldn't this be a REQ_ flag as we should never mix and match bios with
>>> and without this flag in a single request?
>>
>> Do you mean adding both and propagating it from bio to req? submit_bio()
>> takes a bio, so we still need to set it there before it reaches blk-mq.
>> And there might be bio-based drivers using it in the future.
> 
> I think I forgot to reply to this, so let's do this now.
> 
> REQ_ is actually used by both bios and requests, so if you set it in
> bio->bi_opf it will automatically get propagated to the request, but
> it can also always be tested on the bio, including by bio-based
> drivers.

Ah yes, good point, thanks

-- 
Pavel Begunkov