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This patch fixes link validation for used thin-pool.
Udev rules correctly creates symlinks only for unused new thin-pool.
Such thin-pool can be used by foreing apps (like Docker) thus
has /dev/vg/lv link.
However when thin-pool becomes used by thinLV - this link is no
longer exposed to user - but internal verfication missed this
and caused messages like this to be printed upon 'vgchange -ay':
The link /dev/vg/pool should have been created by udev but it was not
found. Falling back to direct link creation.
And same with 'vgchange -an':
The link /dev/vg/pool should have been removed by udev but it is still
present. Falling back to direct link removal.
This patch ensures only unused thin-pool has this link.
Add new logic to identify each unique operation and route
it to the correct function to perform it. The functions
that perform the conversions remain unchanged.
This new code checks every allowed combination of LV type
and requested operation, and for each valid combination
calls the function that performs that conversion.
The first stage of option validation which checks for
incompatible combinations of command line options, is done
done before process_each is called. This is unchanged.
(This new code will allow that first stage validation to
be simplified in a future commit.)
The second stage of checking options against the specific
LV type is done by this new code. For each valid combination
of operation + LV type, the new code calls an existing
function that implements it.
With this in place, the ad hoc checks for valid combinations
of LV types and operations can be removed from the existing
code in a future commit.
(The #if 0 is used to keep the patch clean, and the
disabled code will be removed by a following patch.)
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.
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...
