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

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Message-ID: <45B60A55.6080104@panasas.com>
Date:	Tue, 23 Jan 2007 15:15:01 +0200
From:	Benny Halevy <bhalevy@...asas.com>
To:	James Bottomley <James.Bottomley@...elEye.com>
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 3/6] bidi support: bidirectional request

James Bottomley wrote:
> 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.

Hmm, our proposal introduces two separate and independent i/o areas.
One used for uni-directional transfers and for bidi data output, the
other is used for bidi data input so we're in agreement.

Benny

 

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