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From: Lei Yang <lya755@ece.northwestern.edu>
To: linux-kernel@vger.kernel.org
Subject: loopback on block device
Date: Wed, 27 Oct 2004 13:20:51 -0500	[thread overview]
Message-ID: <417FE703.3070608@ece.northwestern.edu> (raw)

Hello,

Here is a question for loopback device. As far as I understand,  the 
loopback device is used to mount files as if they were block devices.

Then Why I could do "losetup -e XOR /dev/loop0 /dev/ram0" ? Notice that 
ram0 is not mounted anywhere and does not have a filesystem on it. I've 
tried that command and there seems to be no error. I got confused and 
looked into loop.c, it seems to me that a loopback device should be 
associated with a "backing file", why would it work on a block device 
anyway?

I'd appreciate your comments greatly!

TIA,
Lei


             reply	other threads:[~2004-10-27 18:29 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-10-27 18:20 Lei Yang [this message]
2004-10-27 18:29 ` loopback on block device Lei Yang
2004-10-28  0:31   ` Al Viro
2004-10-27 18:58 ` linux-os
2004-10-27 19:42   ` Lei Yang
2004-10-28  9:48     ` Helge Hafting

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