[dm-devel] [RESEND PATCH 3/3] dm mpath: add ability to disable partition creation

[Alasdair G Kergon]

On Tue, Jun 26, 2012 at 02:32:05PM -0400, Mike Snitzer wrote:
> The new 'no_partitions' feature serves as a notifier to kpartx to _not_
> create partitions on these multipath devices.
 
This isn't really multipath-specific so doesn't belong in the target.
It could go into dm core, but we already have flags attached to
udev cookies that can turn udev rules on and off and thereby could
allow userspace multipath to control whether or not kpartx creates
partitions on any particular device.

But first I'd like us to explore creating a config file for kpartx and
controlling the behaviour from there.  Activation could then be
triggered by target type, device name, scsi WWID, dm UUID etc. according
to rules in that file.

I think this approach of handling each layer independently gives us the
best chance of ending up with integrated management of arbitrary device
stacks.

Alasdair