linux-kernel - Re: [dm-devel] Re: [RFC PATCH 1/8] rqbased-dm: allow blk_get_request() to be called from interrupt context

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Message-ID: <458AD2E0.40807@cs.wisc.edu>
Date:	Thu, 21 Dec 2006 12:30:56 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	device-mapper development <dm-devel@...hat.com>,
	mchristi@...hat.com, linux-kernel@...r.kernel.org, agk@...hat.com
Subject: Re: [dm-devel] Re: [RFC PATCH 1/8] rqbased-dm: allow blk_get_request()
  to be called from interrupt context

Jens Axboe wrote:
> On Thu, Dec 21 2006, Mike Christie wrote:
>> Or the block layer code could set up the clone too. elv_next_request
>> could prep a clone based on the orignal request for the driver then dm
>> would not have to worry about that part.
> 
> It really can't, since it doesn't know how to allocate the clone
> request. I'd rather export this functionality as helpers.
> 

What do you think about dm's plan to break up make_request into a
mapping function and in to the part the builds the bio into a request.
This would fit well with them being helpers and being able to allocate
the request from the correct context.

I see patches for that did not get posted, but I thought Joe and
Alasdair used to talk about that a lot and in the dm code I think there
is sill comments about doing it. Maybe the dm comments mentioned the
merge_fn, but I guess the merge_fn did not fit what they wanted to do or
something. I think Alasdair talked about this at one of his talks at OLS
or it was in a proposal for the kernel summit. I can dig up the mail if
you want.
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