linux-kernel - Re: [RFC 3/6] bidi support: bidirectional request

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Message-Id: <1169478021.2769.5.camel@mulgrave.il.steeleye.com>
Date:	Mon, 22 Jan 2007 09:00:21 -0600
From:	James Bottomley <James.Bottomley@...elEye.com>
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 3/6] bidi support: bidirectional request

On Mon, 2007-01-22 at 01:25 +0200, Boaz Harrosh wrote:
> - Instantiate another request_io_part in request for bidi_read.
> - Define & Implement new API for accessing bidi parts.
> - API to Build bidi requests and map to sglists.
> - Define new end_that_request_block() function to end a complete request.

Actually, this approach looks to be a bit too narrow.  You seem to be
predicating on the idea that the bidirectional will transfer in and out
of the same area.  For some of the frame in/frame out stuff, we probably
need the read and write areas for the bidirectional request to be
separated.

James


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