linux-kernel - Re: [dm-devel] [PATCH RFC v1 01/01] dm-lightnvm: An open FTL for open firmware SSDs

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Message-ID: <5330F84C.8090803@bjorling.me>
Date:	Mon, 24 Mar 2014 20:30:20 -0700
From:	Matias Bjorling <m@...rling.me>
To:	Bart Van Assche <bvanassche@....org>,
	device-mapper development <dm-devel@...hat.com>
CC:	snitzer@...hat.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, agk@...hat.com,
	Takashi HOSHINO <hoshino@...s.cybozu.co.jp>
Subject: Re: [dm-devel] [PATCH RFC v1 01/01] dm-lightnvm: An open FTL for
 open firmware SSDs

On 03/23/2014 11:13 PM, Bart Van Assche wrote:
> On 03/21/14 16:37, Christoph Hellwig wrote:
>> Just curious:  why do you think implementing this as a block remapper
>> inside device mapper is a better idea than as a blk-mq driver?
>>
>> At the request layer you already get a lot of infrastructure for all the
>> queueing infrastructure for free, as well as all kinds of other helpers.
>> And the driver never remaps bios anyway but always submits new ones as
>> far as I can tell.
>>
>> Does it even make sense to expose the underlying devices as block
>> devices?  It surely would help to send this together with a driver
>> that you plan to use it on top of.
> 
> There might be some overlap between the functionality available in the
> lightnvm driver and the WalB driver announced last year. That last
> driver might have a wider user base and hence may have received more
> testing. See also http://thread.gmane.org/gmane.linux.file-systems/75124.
>

Hi Bart,

Thanks! There seems to be a little bit that can be reused. It does seem
from the github page that there haven't been any development since its
been posted. Maybe the development is moved elsewhere?

> Bart.
> 

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