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This refactors the code for autoactivation. Previously,
as each PV was found, it would be sent to lvmetad, and
the VG would be autoactivated using a non-standard VG
processing function (the "activation_handler") called via
a function pointer from within the lvmetad notification path.
Now, any scanning that the command needs to do (scanning
only the named device args, or scanning all devices when
there are no args), is done first, before any activation
is attempted. During the scans, the VG names are saved.
After scanning is complete, process_each_vg is used to do
autoactivation of the saved VG names. This makes pvscan
activation much more similar to activation done with
vgchange or lvchange.
The separate autoactivate phase also means that if lvmetad
is disabled (either before or during the scan), the command
can continue with the activation step by simply not using
lvmetad and reverting to disk scanning to do the
activation.
Add support for active cache LV.
Handle --cachemode args validation during command line processing.
Rework some lvm2 internal to use lvm2 defined CACHE_MODE enums
indepently on libdm defines and use enum around the code instead
of passing and comparing strings.
For raid1 use chunksize as bitmap-chunk specification.
Always enforce usage of bitmap - getting comparable outcome
as lvm2 raid support uses.
Add udev_wait after stopping md array - as in fact leg-device
are still in use by target even command has finished.
(mdadm --stop causes WATCH rule wakeup, and
ioctl(STOP_ARRAY) returns IMHO to early - it should finish
and fsync work on leg devices first).
The test was a weak attempt at verifying the special
combination of lvchange/vgchange -aay --sysinit, but
was only looking for lvmetad connection warnings.
Update the warning checks, and check the LV activation
state directly which is the main point.
Rename the test to reflect its purpose of checking
the -aay --sysinit combination.
Update the check about lvmetad running but not used.
Also add tests related to the new lvmetad disabled state.
lvm1 metadata is used here to test the disabled state
because lvm1 metadata is the first condition using the
disabled state.
Improved test script to verify lost mirror image does not
cause mirror corruption while mirror is in use.
TODO: add more cases (lost mlog...), lost image from 3leg mirror...
