linux-kernel - Re: [dm-devel] [PATCH 4/9] block: Make generic_make

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Date:	Mon, 4 Nov 2013 16:55:32 -0800
From:	Kent Overstreet <kmo@...erainc.com>
To:	Mike Christie <michaelc@...wisc.edu>
Cc:	device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, axboe@...nel.dk, hch@...radead.org,
	Alasdair Kergon <agk@...hat.com>
Subject: Re: [dm-devel] [PATCH 4/9] block: Make generic_make_request handle
 arbitrary sized bios

On Mon, Nov 04, 2013 at 03:56:52PM -0800, Mike Christie wrote:
> On 11/04/2013 03:36 PM, Kent Overstreet wrote:
> > @@ -1822,6 +1820,14 @@ void generic_make_request(struct bio *bio)
> >  		 */
> >  		blk_queue_bounce(q, &bio);
> >  
> > +		if (!blk_queue_largebios(q))
> > +			split = blk_bio_segment_split(q, bio, q->bio_split);
> 
> 
> Is it assumed bios coming down this path are created using bio_add_page?
> If not, does blk_bio_segment_split need a queue_max_sectors or
> queue_max_hw_sectors check? I only saw a segment count check below.

Shoot, you're absolutely right - thanks, I'll have this fixed in the next
version.
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