linux-kernel - Re: [PATCH UPDATED block#for-2.6.31 2/3] block: set rq->resid_len to blk_rq

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Date:	Sun, 17 May 2009 20:32:58 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Borislav Petkov <petkovbb@...glemail.com>,
	Pete Zaitcev <zaitcev@...hat.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Eric Moore <Eric.Moore@....com>,
	"Darrick J. Wong" <djwong@...ibm.com>
Subject: Re: [PATCH UPDATED block#for-2.6.31 2/3] block: set rq->resid_len
 to blk_rq_bytes() on issue

Hello, Boaz.

Boaz Harrosh wrote:
> Surly this is not enough. This is not the only place rq->__data_len
> gets a value.  Specifically it can be added to in blk_rq_append_bio.
> You must then update all places that set rq->__data_len to also set
> rq->resid_len.

Right, nice spotting, but I think those are the only two places.  You
now see why I don't like that append thing.  :-)

> Alternatively you could do a single:
> +	rq->resid_len = blk_rq_bytes(rq);
> 
> inside  blk_fetch_request(q) or before the call to prep_fn, or even at
> __elv_add_request().

I think I'll just add resid_len adjustment there right after
__data_len manipulation.  That code path should really go away
eventually.

Thanks.

-- 
tejun
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