linux-kernel - Re: [PATCH 0/1] Implement /dev/byte (a generic byte source similiar to /dev/zero)

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Date:	Mon, 18 Apr 2011 09:57:52 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Alexander Holler <holler@...oftware.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] Implement /dev/byte (a generic byte source similiar
 to /dev/zero)

On Mon, Apr 18, 2011 at 07:37, Alexander Holler wrote:
> I don't know if this patch qualifies for inclusion into the mainline kernel, but
> maybe someone else would be interested in such, so I'm posting it here.
>
> The main idea for that device was to have a source for 0xff to clear FLASH based
> devices. And to make it more generic, I've added the possibility to change the
> default value on a per file descriptor basis.
>
> I don't want to discuss if such a device makes sense or if such should be done
> in userspace only. I like it as a device, otherwise I wouldn't have written it.
> So besides this message, I will not take part in such a discussion.

cant you do this with cuse ?  that would satisfy the "has to be a
device" requirement while keeping it in userspace.

although, i have a hard time seeing there be a realistic perf diff with:
tr '\000' '\377' < /dev/zero | dd ......
-mike
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