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

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Date:	Sun, 21 Jan 2007 19:24:56 -0500
From:	Douglas Gilbert <dougg@...que.net>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	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>,
	Benny Halevy <bhalevy@...asas.com>
Subject: Re: [RFC 1/6] bidi support: request dma_data_direction

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)?

Doug Gilbert
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