Re: Error while testing (using loop device)

[Ryusuke Konishi <ryusuke-sG5X7nlA6pw@public.gmane.org>]

Hi,
On Fri, 23 Jul 2010 10:47:38 -0500, Rodrigo_E._De_León_Plicet wrote:
> On Thu, Jul 22, 2010 at 9:31 PM, Ryusuke Konishi <ryusuke-sG5X7nlA6pw@public.gmane.org> wrote:
> > How about this?
> >
> >  $ sudo mount -t nilfs2 -o ro,cp=3,loop=/dev/loop0 /tmp/test.img /tmp/t2
> >
> > or
> >
> >  $ sudo mount -t nilfs2 -r -o cp=3,loop=/dev/loop0 /tmp/test.img /tmp/t2
> >  ...
> >  $ sudo umount /tmp/t2
> 
> Hi. Thanks for the reply.
> 
> rdl@linage:/tmp$ lscp
>                  CNO        DATE     TIME  MODE  FLG   NBLKINC       ICNT
>                    1  2010-07-23 10:36:35   cp    -         11          3
>                    2  2010-07-23 10:37:22   cp    -          8          3
>                    3  2010-07-23 10:38:13   ss    -        615          4
>                    4  2010-07-23 10:38:58   cp    -         77          5
>                    5  2010-07-23 10:39:05   cp    -         21         10
>                    6  2010-07-23 10:39:12   cp    -         26          7
>                    7  2010-07-23 10:39:43   cp    i          8          7
> 
> rdl@linage:/tmp$ ls -lad t*
> drwxrwxrwx 3 root root       4096 2010-07-23 10:39 t
> drwxrwxrwx 2 rdl  rdl           6 2010-07-23 10:36 t2
> -rw-r--r-- 1 rdl  rdl  1049624576 2010-07-23 10:36 test.img
> 
> rdl@linage:/tmp$ mount|grep loop
> /dev/loop0 on /tmp/t type nilfs2 (rw,gcpid=2980)
> 
> rdl@linage:/tmp$ sudo mount -t nilfs2 -o ro,cp=3,loop=/dev/loop1
> /tmp/test.img /tmp/t2
> mount.nilfs2: Error while mounting /dev/loop1 on /tmp/t2: Read-only file system
> 
> :(

This looks limitation of the loop devices.

Try the next one for snapshot mounts.

 $ sudo mount -t nilfs2 -o ro,cp=3 /dev/loop0 /tmp/t2

Regards,
Ryusuke Konishi
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