List of packed thin-pool metadata for tests:
* tmeta.pack: A pool with a volume and few snapshots. The origin volume is
randomly updated by a synthetic workload between snapshots, causes exclusive
mappings within each snapshot. The maximum ref count of a mapping tree leaf
is equivalent to the number of devices in this pool (11 in this case).
* tmeta_with_metadata_snap.pack: Identical to `tmeta.pack` with additional
metadata snapshot.
* tmeta_with_corrupted_metadata_snap.pack: A small pool with one device and damaged
metadata snapshot broke.
* corrupted_tmeta_with_metadata_snap.pack: Data structures except that of the
metadata snapshot are all corrupted.
* tmeta_device_id_reuse: Two different subtrees share the same device id
* tmeta_device_id_reuse_with_corrupted_thins: Same as above but the subtree in
metadata snapshot broke.
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