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For more advanced support we need to ensure better logic for calling
external much more advanced script for maintanance of thin-pool.
So this new code ensures:
When thin-pool data or metadata is bigger then 50%,
then with each 5% increment, action is called.
This is independent from autoextend_threshold.
This action always happens when thin-pool is over threshold,
(so no action when it's exactly i.e. 60%).
The only exception is 100% full thin-pool - which invokes 'last'
action.
Since thin-pool occupancy may change also downward, code needs
to also handle possibly reduction of occupancy of thin-pool.
So when usage drop from 90% to 50%, thin-pool will start to call
again action when it will pass 55% threshold.
This give external commands lot of option i.e. to call 'fstrim'
before actual resize is needed.
Default internal logic will stop trying to do any 'rescue' action
when executed command fails.
This will be now fully in hands of external script if such
behaviour is needed.
Instead of stopping monitoring after couple failing retries,
keep monitoring forever, just make larger delays between command
retries (ATM upto ~42 minutes).
So syslog is not spammed too often, yet commands have a chance to
be retried and succeed eventually...
When dmeventd configured command does not start with 'lvm ' prefix,
it's going to be an 'external' command.
In this case we split command by spaces to argv strings.
When thin-pool processes event and 'lvextend --use-policies' fails
rather capture up-to-date new info as the fullness percentage may
have jumped noticable. This way we could use 'more' correct numbers
when checking for thresholds.
The function timeout_add_seconds has quite a bit of variability. Using
timeout_add which specifies the timeout in ms instead of seconds. Testing
shows that this is much more consistent which should improve clients that
are using shorter timeouts for the API and the connection.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Allows the user to override the number of commands that get dumped
to the log when we encounter a lvm error. Also useful during
development when you don't want to see the blackbox output.
When reading data from stdout & stderr we were reading until the
reading until we got None back which really isn't needed as the
read will return everything that is available.
We need to acquire a lock which can block us which in turn causes
the dbus request handling to block as well. Place the request on
the work queue instead.
Our expectation was that when using the lvm shell that when the lvm prompt
was read from stdout, that all other ouput had been written and flushed.
However, this doesn't appear to be the case. Add extra read passes to
retrieve delayed report data.
