Re: mount -ur doesn't work on NetBSD 5.0.2

[Juergen Hannken-Illjes <hannken%eis.cs.tu-bs.de@localhost>]

On Mon, May 10, 2010 at 12:46:34PM +0200, Michael Felke wrote:
> Hello,
> 
> we started to setup a new release of our netbsd server with NetBSD 5.0.2 
> in stead of 4.0.1, as we have done last time.
> Everything went well, until we tried to lock our root partion with 
> "mount -ur /" again, after making it writeable with "mount -uw /".
> Mount_ffs always complains that the operation is not supported, but we 
> are using it since NetBSD 2.0, our first NetBSD based server. Forcing it 
> work with "mount -urf /" doesn't work also.
> We couldn't find something about a change of the ffs's option update 
> behavior in the release notes of NetBSD 5.0.x.
> Is this an indented change made to the GERNERIC kernel, then we need 
> some help how to deactivate this new feature, or is it a bug, so must 
> perhaps change back to 4.0.1.
> The server is build on a i386 system and uses the raid device in level 1.
> 
> sincerely
> Michael Felke

R/W to R/O downgrade has been disabled.  Please see

  PR kern/30525 remounting ffs read-only (mount -ur) does not sync metadata

Removing revision 1.373 of sys/kern/vfs_syscalls.c should re-enable the old
(and risky) behaviour.

-- 
Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig 
(Germany)