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Copy another optimization from pvscan -aay to vgchange -aay.
When using the optimized label scan for only one VG, acquire the
VG lock prior to the scan. This allows vg_read to then skip the
repeated label scan that normally happens after locking the vg.
For completeness and consistency, adjust the behavior
for some variations of:
vgchange -aay --autoactivation event [vgname]
The current standard use is with a VG name arg, and the
command is only called when all pvs_online files exist.
This is the optimal case, in which only pvs_online devs
are read. This remains the same.
Clean up behaviors for some other unexpected uses of the
command:
. With no VG name arg, the command activates any VGs
that are complete according to pvs_online. If no
pvs_online files exist, it does nothing.
. If a VG name is used but no PVs online files exist for
the VG, or the PVs online files are incomplete, then
consider there could be a problem with the pvs_online
files, and fall back to a full label scan prior to
attempting the activation.
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
