Re: [uml-devel] df -h and hostfs

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 12 January 2005 12:48, stian@nixia.no wrote:
> (ops, forgot reply-all)
>
> df -h inside UML: (/etc/mtab is symlinked to /proc/mounts)

> Filesystems           Size  Used Avail Use% Mounted on
> rootfs                496M   11M  460M   3% /
> /dev/root             496M   11M  460M   3% /
> /dev/ubd/disc1/part1  187G  146G   33G  82% /a

> a                     7.3G  6.2G  717M  90% /a/lost+found
> /root/UML/a           7.3G  6.2G  717M  90% /a/lost+found
What has happened here? Why there are two entries on the same mount point? One 
mount over the other?

> mount inside UML:

> rootfs on / type rootfs (rw)
> /dev/root on / tyoe ext3 (ro)
> none on /dev/ type devfs (rw)
> /dev/ubd/disc1/part1 on /a type ext2 (rw)
> a on /a/lost+found type hostfs (rw)
> noen on poroc type proc (rw,nodiratime)

How did you mount that folder on /a/lost+found? You wanted, probably, to do:
mount <whatever> > /a/lost+found -t hostfs -o /root/UML/a (or "-o /a", if UML 
is chrooted inside /root/UML).

But it seems that you forgot the -o /root/UML/a part and assumed that could be 
given on the first part... even /proc/mounts contains most mount options. 
I've had just re-checked that even when the root is passed with -o, that is 
used even for the mount-point. And now I've actually ran the test...
> df -h on host:
>
> Filesystems           Size  Used Avail Use% Mounted on
> /dev/hda2             7.3G  6.2G  717M  90% /
> none                  126M     0  126M   0% /dev/shm
> 192.168.1.1:/var/home/stian
>                       147G  104G   37G  75% /root/UML/a

> mount on host

> /dev/hda2 on / type xfs (rw,noatime)
> none on /dev type devfs (rw)
> none on /proc type proc (rw)
> noen on /dev/shm type tmpfs (rw)
> 192.l68.1.1:/var/home/stian on /root/UML/a type nfs (rw,addr=192.168.1.1)

> The problem is the nfs partition you can see, that is mounted inside UML
> again as hostfs. (This setup is a recovery of a broken disk where I wanted
> the cow layer when testing recoverytools and dumping out files they
> found). The UML-kernel itself is 2.6.10-rc3-mm1 with the patch-set from
> the web-pages dated back 1-2 weeks ago.

> Stian


-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade


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