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Subject: Re: Layered Driver Support in Linux ?
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tom Sanders <developer_linux@yahoo.com>
Cc: linux-kernel@vger.kernel.org
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Date: 08 Aug 2002 20:53:12 +0100
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On Thu, 2002-08-08 at 19:16, Tom Sanders wrote:
> Does Linux support layered drivers ?
> 
> I want to write a driver that will take requests from
> the applications and will pass them on to underlying
> SD disk driver. For this I need to map open, close,
> read, write, ioctl etc entry points to corresponding
> functions of the underlying driver.

Two examples we have are

loop	-	maps a file as a device
md	-	a software implemented raid layer

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