Message-ID: <45B40458.9010107@torque.net>
Date: Sun, 21 Jan 2007 19:24:56 -0500
From: Douglas Gilbert <dougg@torque.net>
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To: Boaz Harrosh <bharrosh@panasas.com>
CC: Jens Axboe <jens.axboe@oracle.com>, Christoph Hellwig <hch@infradead.org>,
       Mike Christie <michaelc@cs.wisc.edu>, linux-scsi@vger.kernel.org,
       linux-kernel@vger.kernel.org, open-iscsi@googlegroups.com,
       Daniel.E.Messinger@seagate.com, Liran Schour <LIRANS@il.ibm.com>,
       Benny Halevy <bhalevy@panasas.com>
Subject: Re: [RFC 1/6] bidi support: request dma_data_direction
References: <45B3F578.7090109@panasas.com>
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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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