linux-kernel - Re: [PATCH 03/11] block: add rq->resid

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Message-ID: <4A0993BA.7090505@kernel.org>
Date:	Wed, 13 May 2009 00:20:26 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org, James.Bottomley@...senPartnership.com,
	linux-scsi@...r.kernel.org, bzolnier@...il.com,
	petkovbb@...glemail.com, sshtylyov@...mvista.com,
	mike.miller@...com, Eric.Moore@....com, stern@...land.harvard.edu,
	fujita.tomonori@....ntt.co.jp, zaitcev@...hat.com,
	Geert.Uytterhoeven@...ycom.com, sfr@...b.auug.org.au,
	grant.likely@...retlab.ca, paul.clements@...eleye.com,
	tim@...erelk.net, jeremy@...source.com, adrian@...en.demon.co.uk,
	oakad@...oo.com, dwmw2@...radead.org, schwidefsky@...ibm.com,
	ballabio_dario@....com, davem@...emloft.net, rusty@...tcorp.com.au,
	Markus.Lidel@...dowconnect.com,
	Doug Gilbert <dgilbert@...erlog.com>,
	"Darrick J. Wong" <djwong@...ibm.com>
Subject: Re: [PATCH 03/11] block: add rq->resid_len

Boaz Harrosh wrote:

> The solution to this, I think, is that the bouncing layer should
> receive a residual count, and not bounce anything beyond what's
> transferred. (On reads, writes does nothing), and zero-out the
> rest. This of course means that all block drivers make sure residual
> is properly set, the way it should as explained in this
> thread. (SCSI does the right thing where it can, for example see
> scsi_execute())

Umm... shouldn't the request just be successfully finished with
positive residue count and with sense data if necessary?  Block layer
request failure means, and has always meant, complete failure.

Thanks.

-- 
tejun
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