[PATCH v5 01/18] block: Add PR callouts for read keys and reservation

[Mike Snitzer]

On Fri, Mar 24 2023 at  2:17P -0400,
Mike Christie <michael.christie at oracle.com> 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