linux-kernel - Re: [PATCH 03/14] block: implement blk_rq_map_kern

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Message-ID: <49CAE425.5050009@kernel.org>
Date:	Thu, 26 Mar 2009 11:10:45 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	bzolnier@...il.com, linux-kernel@...r.kernel.org, axboe@...nel.dk,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 03/14] block: implement blk_rq_map_kern_prealloc()

Hello,

Boaz Harrosh wrote:
> I have a similar, totally unrelated patch queued, perhaps we can unify
> the efforts, to satisfy both our needs in one stone.
> 
> I've sent this patch:
> http://www.spinics.net/lists/linux-scsi/msg34082.html
> 
> In an effort to un-export blk_rq_append_bio().
> 
> Perhaps you could reorder the code below a bit?
> 
> My proposal is:
> * blk_rq_map_kern_prealloc => is simplified to be
>     int blk_rq_map_bio(struct request_queue *q, struct request *rq,
> 		       struct bio *bio);
> 
> * The extra checks currently inside blk_rq_map_kern_prealloc are moved
>   to bio_map_kern_prealloc()
> 
> * Users call bio_map_kern_prealloc() directly and then use blk_rq_map_bio()
>   in a two stage process.
> 
> So blk_rq_map_bio becomes a BLOCK_PC command's way of a
> pre-allocated bio the way FS_PC commands use generic_make_request.

Sounds good.  I'll make the change.

> Thanks for doing all this. BTW' how close are we to remove req->data
> and req->buffer

Those patches will be going out later today.  It will also kill
rq->hard_* and rq->*nr_sectors.  Single byte-granual data length for
all along with single way to carray data via bio! :-)

Thanks.

-- 
tejun
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