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For a quick overview of config when debugging and to quickly check
which values are different from defaults and which are not defined
in the config and for which defaults are used.
If clvmd does not hold any lock, it should also not keep any opened
device.
The reason for this patch is, that refresh_toolcontext calls
dev_cache_exit() which destroys whole device cache (even those with
opened file) - previous patch added recovery path to avoid memory
corruption, but opened files are still bugs that need to be fixed.
So this patch certainly kills many internal mirror & raid tests,
since they leak opened file descriptors (when tests are executed
with 'abort_on_error').
Operate with lvm_thread_exit while holding lvm_thread_mutex.
Don't leave unfinished work in the lvm thread queue
and always finish all queued tasks before exit,
so no cmd struct is left in the list.
(in-release fix)
When lvm2 command works with clvmd and uses locking in wrong way,
it may 'leak' certain file descriptors in opened (incorrect) state.
dev_cache_exit then destroys memory pool of cached devices, while
_open_devices list in dev-io.c was still referencing them if they
were still opened.
Patch properly calls _close() function to 'self-heal' from this
invalid state, but it will report internal error (so execution
with abort_on_internal_error causes immediate death). On the
normal 'execution', error is only reported, but memory state is
corrected, and linked list is not referencing devices from
released mempool.
For crash see: https://bugzilla.redhat.com/show_bug.cgi?id=1073886
When we're trying to search for certain tree node
in daemon's reply, we default to a blank string ""
if the node is not found. This happens during lvmetad
initialization.
However, when the default blank string is used, we
can't use dm_config_find_str at the same time - the
dm_config_find_str_allow_empty should be used instead.
Otherwise a a warning message:
"WARNING: Ignoring unsupported value for ..."
is issued.
Before:
thin_disabled_features = ""
Now:
thin_disabled_features = []
Which is a more correct and consistent way of specifying void array
though parses can handle both forms.
Smallest supported size for swap device is 40KB, however current
test skipped devices smaller then 4096 sectors (2MB).
Since page is in bytes, convert it to sectors before comparing
with device size (in sectors).
We have to close cluster in some predicatable way,
otherwise we may access released memory from different
threads.
So move closedown till the point we know all thread
are closed. New messages from cluster are discarded.
