On Fri, Mar 24 2023 at  2:17P -0400,
Mike Christie [off-list ref] wrote:

Add callouts for reading keys and reservations. This allows LIO to support
the READ_KEYS and READ_RESERVATION commands and will allow dm-multipath
to optimize it's error handling so it can check if it's getting an error
because there's an existing reservation or if we need to retry different
paths.

Not seeing anything in DM's path selectors that adds these
optimizations. Is there accompanying multipath-tools callouts to get
at this data to optimize path selection (via DM table reloads)?

Mike