Re: [RFC 1/6] bidi support: request dma_data_direction

[Benny Halevy <bhalevy@panasas.com>]

Douglas Gilbert wrote:
> Boaz Harrosh wrote:
>> - Introduce a new enum dma_data_direction data_dir member in struct request.
>>   and remove the RW bit from request->cmd_flag
>> - Add new API to query request direction.
>> - Adjust existing API and implementation.
>> - Cleanup wrong use of DMA_BIDIRECTIONAL
>> - Introduce new blk_rq_init_unqueued_req() and use it in places ad-hoc
>>   requests were used and bzero'ed.
> 
> With a bi-directional transfer is it always unambiguous
> which transfer occurs first (or could they occur at
> the same time)?

The bidi transfers can occur in any order and in parallel.

> 
> Doug Gilbert
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/