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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.
Avoid code duplication and use exiting commonly used
lv_update_and_reload() function.
There is still one place left where mirror is doing strange
double suspend call - needs there more thinking what's wrong with
that code.
When lvconvert adds a new leg - it's doing it free 'temporary' image
layer - however this temporary 'internal' mirror is also MIRRORED LV.
But the status bit was not properly transfered through layer.
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.
The default dbus python library mode of operation is to leverage
introspection. However, this introspection data isn't accessible
for users of the library and they have to specifically retrieve
the introspection data too. This resulted in many introspection
calls being made. This change eliminates introspection calls if
we are testing multiple concurrent test clients. If it's a single
client we will leverage a reduced amount of introspection data to
verify the introspection data is correct. Typically clients don't
leverage introspection data nearly as much as this test client.
The env variable LVM_DBUSD_PV_DEVICE_LIST when present and filled in
with at least 4 physical devices will run concurrently with other
instances running as long as they specify different devices in their
env variable.
When the env variable is not present the test runs as it did before.
In preparation to have more than one thread issuing commands to lvm
at the same time we need to serialize updates to the dbus state and
retrieving the global lvm state. To achieve this we have one thread
handling this with a thread safe queue taking and coalescing requests.
Looks like this isn't support across versions. Need to add functionality
to service to return the supported segment types, so we only use the
supported ones.
There are two possible errors in _dm_stats_populate_region():
* No region struct in dms->regions[region_id]
* Failure to parse data from @stats_print
These have very different causes: the first occurs where a client
program is populating one region at a time (region_id is a single
region identifier), and has not previously called dm_stats_list()
to dimension the region tables; this is an API usage error.
The second occurs when either we read unparseable data from the
kernel (kernel bug), or where various resource allocations fail.
Separate these two cases out and log separate messages for each
(allocation failures in the path already have their own distinct
message), since the "failed to parse.." message in the un-listed
handle case is confusing and misleading.
