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

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Message-ID: <x494nrmx2ux.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 11 May 2012 09:29:42 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.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


[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.

Cheers,
Jeff
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