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9681de4657
Make dd_snap_cmtime property persistent across mount and unmount operations by storing in ZAP and restore the value from ZAP on hold into dd_snap_cmtime instead of updating it. Expose dd_snap_cmtime as 'snapshots_changed' property that provides a mechanism to quickly determine whether snapshot list for dataset has changed without having to mount a dataset or iterate the snapshot list. It specifies the time at which a snapshot for a dataset was last created or deleted. This allows us to be more efficient how often we query snapshots. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Umer Saleem <usaleem@ixsystems.com> Closes #13635 |
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