linux-kernel - Re: Userspace Block Device

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Date:	Tue, 19 May 2015 00:34:44 -0500
From:	Rob Landley <rob@...dley.net>
To:	Bill Speirs <bill.speirs@...il.com>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Userspace Block Device

On Mon, May 18, 2015 at 2:01 PM, Bill Speirs <bill.speirs@...il.com> wrote:
> My goal is to provide Amazon S3 or Google Cloud Storage as a block
> device. I would like to leverage the libraries that exist for both
> systems by servicing requests via a user space program.
>
> I found 2 LKML threads that talk about a "userspace block device":
>
> 2005-11-09: http://article.gmane.org/gmane.linux.kernel/346883
> 2009-07-27: http://article.gmane.org/gmane.linux.kernel/869784
>
> The first thread resulted in Michael Clark suggesting his kernel
> module: https://github.com/michaeljclark/userblk The second
> essentially resulted in "use nbd". Mr. Clark's module is now over 10
> years old, and ndb seems like a bit of a Rube Goldberg solution.

I wrote the busybox and toybox nbd clients, and have a todo list item
to write an nbd server for toybox. I believe there's also an nbd
server in qemu. I haven't found any decent documentation on the
protocol yet, but what specifically makes you describe it as rube
goldberg?

Rob
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