Bug#504678: add -r to make resulting devices read/only

[Guido Günther]

Hi,
On Wed, Nov 05, 2008 at 09:44:35PM -0500, Wakko Warner wrote:
[..snip..] 
> I'd like to have the ability to create targets in which are read-only to
> keep from accidentally modifying the newly created device.  In some cases,
> mounting with -o ro still modifies the device (in the case of ext3
> filesystems).  I created a small patch that will do this.  I have tested it
> only to the point that using -a with or without -r produces the desired
> effects.
Thanks for the patch, looks good from my pov. I suggest sending this
upstream to dm-devel at redhat.coml hear what they think about it.  
Cheers,
 -- Guido