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If the transient service remains after it's done, then
it prevents the same transient service from being run
again later if the PVs are detached and reattached
(although the behavior of a second autoactivation is not
well defined and may only work in limited cases.)
Port the old pvscan -aay scanning optimization to vgchange -aay.
The optimization uses pvs_online files created by pvscan --cache
to derive a list of devices to use when activating a VG. This
allows autoactivation of a VG to avoid scanning all devices, and
only scan the devices used by the VG itself. The optimization is
applied internally using the device hints interface.
The new option "--autoactivation event" is given to pvscan and
vgchange commands that are called by event activation. This
informs the command that it is being used for event activation,
so that it can apply checks and optimizations that are specific
to event activation. Those include:
- skipping the command if lvm.conf event_activation=0
- checking that a VG is complete before activating it
- using pvs_online files to limit device scanning
new udev rule 69-dm-lvm.rules replaces
69-dm-lvm-meta.rules and lvm2-pvscan.service
udev rule calls pvscan directly on the added device
pvscan output indicates if a complete VG can be activated
udev env var LVM_VG_NAME_COMPLETE is used to pass complete
VG name from pvscan to the udev rule
udev rule uses systemd-run to run vgchange -aay <vgname>
