[dm-devel] [PATCH 2/2 v2] dm mpath: allow table load with 0 priority groups

[Mike Snitzer]

On Thu, Feb 10 2011 at  4:06pm -0500,
Mike Snitzer <snitzer at redhat.com> wrote:

> If an mpath device is held open when all paths in the last priority
> group have failed userspace multipathd will attempt to reload the
> associated DM table to reflect that the device no longer has any
> priority groups.  But the reload attempt always failed because the
> multipath target did not allow 0 priority groups.
> 
> Adjust multipath target to allow a table with both 0 priority groups
> and 0 for the initial priority group number.
> 
> All multipath target messages related to priority group (enable_group,
> disable_group, switch_group) will properly handle a priority group of
> 0 (will cause error).
> 
> When reloading a multipath table with 0 priority groups, userspace
> multipathd must be updated to specify an initial priority group number
> of 0 (rather than 1).
> 
> Signed-off-by: Mike Snitzer <snitzer at redhat.com>
> Acked-by: Babu Moger <babu.moger at lsi.com>

Forgot Hannes':

Acked-by: Hannes Reinecke <hare at suse.de>