linux-kernel - Re: [PATCH v5 02/12] dm: Use bioset's front_pad for dm_rq_clone_bio

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Message-ID: <CAOzFzEhPW5-edb6mnL2gNbb4956u2MbWqQovv01010PyBCbc+g@mail.gmail.com>
Date:	Sat, 11 Aug 2012 15:24:45 +1000
From:	Joseph Glanville <joseph.glanville@...onvm.com.au>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-bcache@...r.kernel.org,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com, axboe@...nel.dk,
	agk@...hat.com, neilb@...e.de, drbd-dev@...ts.linbit.com,
	vgoyal@...hat.com, mpatocka@...hat.com, sage@...dream.net,
	yehuda@...newdream.net, snitzer@...hat.com
Subject: Re: [PATCH v5 02/12] dm: Use bioset's front_pad for dm_rq_clone_bio_info

Hi Kent, Tejun

On 9 August 2012 09:57, Kent Overstreet <koverstreet@...gle.com> wrote:
>> Also, how was this tested?
>
> Well, AFAICT the only request based dm target is multipath, and from the
> documentation I've seen it doesn't appear to work without multipath
> hardware, or at least I haven't seen it documented how. So, unless
> there's another user I missed it's not been tested.

Multipath can be tested quite easily with a loopback scsi target, you
don't require specialized hardware.
The easiest way to do this would probably be the built in LIO target +
open_iscsi initiator.

I haven't attempted running this current version of the patch series
but I haven't run into issues with bcache+multipath in the past.

>
>>
>> Thanks.
>>
>> --
>> tejun
> --
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