linux-kernel - Re: File as generic block-device?

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Message-ID: <48FF2C43.6010702@dolphinics.no>
Date:	Wed, 22 Oct 2008 15:36:03 +0200
From:	Simen Thoresen <simentt@...phinics.no>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: File as generic block-device?

Geert Uytterhoeven wrote:
> On Wed, 22 Oct 2008, Simen Thoresen wrote:
>> I have a project where I require to treat a file as a block-device
>> (specifically, I want a file on an ext3 fs to act as one of the raid-members
>> in a md-based stripe-set. I know that I can make a /filesystem/ on a file
>> because both mkfs and mount (with -o loop) will accept a file as a
>> block-device, but I have found no such function for mdadm, and am thus asking
>> for a kernel-internal way to re-plug a file into the block-device layer.
>>
>> Is this possible?
> 
> Sure! You just have to create the loop device (/dev/loop*) yourself using
> losetup(8). `mount -o loop' does it itself behind your back.

Ah! Perfect, thank you.

-S

> With kind regards,
> 
> Geert Uytterhoeven
> Software Architect
> 
> Sony Techsoft Centre Europe
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-- 
Simen Thoresen - Dolphin ICS Systems Administrator
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