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Checks whether VDO support is enabled.
Detects presence of 'vdoformat' tool which is required for to format VDO pool.
ATM build of VDO is NOT automatically enabled (None is default).
To enable build of LVM with VDO support use:
configure --with-vdo=internal
TODO: Maybe future version may switch to link some small VDO library for formating
(would require linking and package dependency).
When node loading fails, there is not much the caller can do,
since there is 'unknown' set of devices preloaded.
Only suspend during preload knows future precommitted 'metadata',
so it's non-trivial to drop 'preloaded' entries with any later call.
However dm tree tracks newly loaded entries - so in this case it
may simplify the recovery path by dropping preloaded entries so
they are not leaked in the DM table.
For better code reuse split _node_send_messages into commont
messaging part and separate _thin_pool_node_send_messages.
Patch makes it possible to better reuse common code for messaging
other targets.
The device-mapper directory now holds a copy of libdm source. At
the moment this code is identical to libdm. Over time code will
migrate out to appropriate places (see doc/refactoring.txt).
The libdm directory still exists, and contains the source for the
libdevmapper shared library, which we will continue to ship (though
not neccessarily update).
All code using libdm should now use the version in device-mapper.
