[Gllug] UML file system question...

[Jan Ploski]

Hello Jake,

First of all, sorry for emailing you out of the blue. I am trying to set
up User Mode Linux with the Debian root file system, and running into
exactly the same problem that you once described on the Gllug mailing
list (the only such report that I could find through Google).

I thought that maybe you have figured it out in the meanwhile
and would not mind sharing the solution?

Best regards -
Jan Ploski

On Wed May 29 20:15:01 2002 you wrote:

> Hi,
> 
> I'm fiddling around a bit with UML (Thanks for the suggestion Tushar
> ;-)) on a Debian system but have come up upon a temporary glitch that is
> going to have me scratching my head for hours but probably has a very
> simple answer, and something very obvious I'm doing wrong....
> 
> Basically I've got the thing working as expected, running from a single
> root_fs file system /dev/udb0 but I'm trying to start it up with an
> additional file system for /home with some spare space so I used dd to
> create a file on the host machine like so:-
> 
> 
> dd if=/dev/zero of=home_fs seek=500 count=1 bs=1M
> 
> (got the block size and seek from the howto, although I'm no expert
> there and the howto seems to relate to reiserfs rather than ext2 which
> I'm starting with for the time being, so it may be wrong)
> 
> I'm then starting up uml like this:-
> 
> linux eth0=ethertap,tap1,fe:fd:0:0:0:2,213.253.25.151
> ubd0=/home/jj/root_fs ubd1=/home/jj/home_fs
> 
> and all is fine apart from the fact that I can't then seem to use fdisk,
> fsck or mount to get the home_fs bit mounted as another partition.
> 
> Things I have randomly for no good reason tried without success:-
> 
> # fdisk /dev/ubd1
> 
> Unable to read /dev/ubd1
> 
> (hoto doesn't mention fdisk, perhaps not needed anyway)
> 
> # mkfs /dev/ubd1
> 
> mke2fs 1.27 (8-Mar-2002)
> mkfs.ext2: Device size reported to be zero.  Invalid partition
> specified, or partition table wasn't reread after running fdisk, due to
> a modified partition being busy and in use.  You may need to reboot to
> re-read your partition table.
> 
> Anyone got any experience/suggestions that might help on this one?
> 
> Many thanks for any help I might get,
> 
> Jake.


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