linux-kernel - Re: [RFC 1/6] bidi support: request dma_data

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Date:	Mon, 22 Jan 2007 08:06:50 +0200
From:	Benny Halevy <bhalevy@...asas.com>
To:	dougg@...que.net
CC:	Boaz Harrosh <bharrosh@...asas.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	open-iscsi@...glegroups.com, Daniel.E.Messinger@...gate.com,
	Liran Schour <LIRANS@...ibm.com>
Subject: Re: [RFC 1/6] bidi support: request dma_data_direction

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
> -
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