Date: Wed, 22 Oct 2008 15:30:32 +0200 (CEST)
From: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
To: Simen Thoresen <simentt@dolphinics.no>
cc: linux-kernel@vger.kernel.org
Subject: Re: File as generic block-device?
In-Reply-To: <48FF2304.8070301@dolphinics.no>
Message-ID: <Pine.LNX.4.64.0810221529200.29342@vixen.sonytel.be>
References: <48FF2304.8070301@dolphinics.no>
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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.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
Fax:      +32 (0)2 700 8622
E-mail:   Geert.Uytterhoeven@sonycom.com
Internet: http://www.sony-europe.com/

A division of Sony Europe (Belgium) N.V.
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