linux-kernel - Re: [dm-devel] [Bcache v13 01/16] Only clone bio vecs that are in use

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Message-ID: <20120511202949.GB26298@google.com>
Date:	Fri, 11 May 2012 13:29:49 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, linux-bcache@...r.kernel.org,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	tejun@...gle.com, agk@...hat.com, Martin Peterson <mkp@....net>
Subject: Re: [dm-devel] [Bcache v13 01/16] Only clone bio vecs that are in use

On Fri, May 11, 2012 at 09:29:42AM -0400, Jeff Moyer wrote:
> 
> [top posting fixed]
> 
> Kent Overstreet <koverstreet@...gle.com> writes:
> 
> > 2012/5/10 Vivek Goyal <vgoyal@...hat.com>:
> >> On Wed, May 09, 2012 at 11:08:13PM -0400, Kent Overstreet wrote:
> >>
> >> [..]
> >>> -
> >>> -     if (bio_integrity(bio)) {
> >>> -             bio_integrity_clone(clone, bio, GFP_NOIO, bs);
> >>> -
> >>> +#if 0
> >>> +     if (bio_integrity(bio))
> >>>               if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
> >>>                       bio_integrity_trim(clone,
> >>>                                          bio_sector_offset(bio, idx, 0), len);
> >>> -     }
> >>> -
> >>> +#endif
> >>
> >> Dead/debug code under "#if 0" ?
> >>
> > Oh, I never got around to figuring out what needed to be done with the
> > bio integrity - presumably it'll have to be handled differently
> > somehow (I'm assuming an index in the integrity bvec is intended to
> > match up with an index in the regular bvec), but I don't have any way
> > to test the integrity stuff.
> 
> The scsi debug module supports dif/dix, so you can use that for testing.

Thanks, I'll try that.
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