Re: loopback on block device

[Al Viro]

On Wed, Oct 27, 2004 at 01:29:54PM -0500, Lei Yang wrote:
> >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?

Because block device is a file.
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