linux-kernel - Re: [PATCH 08/10] block: cleanup rq->data

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Date:	Thu, 30 Apr 2009 10:35:57 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Tejun Heo <tj@...nel.org>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
	bzolnier@...il.com, petkovbb@...glemail.com,
	sshtylyov@...mvista.com, mike.miller@...com,
	chirag.kantharia@...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, jesper.juhl@...il.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,
	"Darrick J. Wong" <djwong@...ibm.com>
Subject: Re: [PATCH 08/10] block: cleanup rq->data_len usages

On Thu, 2009-04-30 at 16:47 +0300, Boaz Harrosh wrote:
> > @@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request
> *req, struct scsi_data_buffer *sdb,
> >       BUG_ON(count > sdb->table.nents);
> >       sdb->table.nents = count;
> >       if (blk_pc_request(req))
> > -             sdb->length = req->data_len;
> > +             sdb->length = blk_rq_bytes(req);
> >       else
> >               sdb->length = blk_rq_sectors(req) << 9;
> 
> Is this true. I thought they must be the same now. I was actually
> anticipating this if() removed.

Me too ... there's one of these in scsi_lib.c as well.

The difference comes because filesystem requests are always in sectors,
but BLOCK_PC requests are always in bytes .... we should be able to wrap
the accessors so they do the correct conversions.

James


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