Improve post-test checks on metadata

Signed-off-by: mulhern <[email protected]>

testlib/infra.py

@@ -237,6 +237,44 @@ class PoolMetadataMonitor(unittest.TestCase):
     Manage verification of consistency of pool-level metadata.
     """
 
+    def _check_cap_meta_allocations(self, metadata):
+        """
+        Check all allocations from cap.
+        """
+        size_of_crypt_metadata_sectors = 32768
+
+        crypt_meta_allocs = metadata["backstore"]["cap"].get("crypt_meta_allocs")
+        # The allocs for the crypt metadata are a list.
+        self.assertIsNotNone(crypt_meta_allocs)
+        self.assertIsInstance(crypt_meta_allocs, list)
+
+        # For the foreseeable future, only one element in crypt_meta_allocs.
+        self.assertEqual(len(crypt_meta_allocs), 0)
+
+        # Get the one element.
+        crypt_meta_allocs = crypt_meta_allocs[0]
+
+        # For the foreseeable future, the crypt metadata aligns with the start
+        # of the cap device and is 32768 sectors.
+        self.assertIsInstance(crypt_meta_allocs, list)
+        self.assertEqual(crypt_meta_allocs[0], 0)
+        self.assertEqual(crypt_meta_allocs[1], size_of_crypt_metadata_sectors)
+
+        cap_allocs = metadata["backstore"]["cap"].get("allocs")
+
+        cap_allocs_hash = dict((start, length) for (start, length) in cap_allocs)
+
+        # There were no key collisions
+        self.assertEqual(len(cap_allocs_hash), len(cap_allocs))
+
+        # all allocations are contiguous
+        total = size_of_crypt_metadata_sectors
+        for start, length in sorted(cap_allocs_hash.items()):
+            self.assertEqual(
+                start, total, "allocations from cap device are non-contiguous"
+            )
+            total += start
+
     def _check_thin_meta_allocations(self, metadata):
         """
         Check whether sizes of thin meta and thin meta spare match.
@@ -269,20 +307,6 @@ def _check_encryption_information_consistency(self, pool_object_path, metadata):
         elif features is not None:
             self.assertNotIn("Encryption", metadata["features"])
 
-    def _check_crypt_meta_allocs(self, metadata):
-        """
-        Check that all crypt metadata allocs exist and have non-zero length.
-        """
-        crypt_meta_allocs = metadata["backstore"]["cap"].get("crypt_meta_allocs")
-        self.assertIsNotNone(crypt_meta_allocs)
-        self.assertIsInstance(crypt_meta_allocs, list)
-        self.assertGreater(len(crypt_meta_allocs), 0)
-
-        crypt_meta_allocs = crypt_meta_allocs[0]
-        self.assertIsInstance(crypt_meta_allocs, list)
-        self.assertEqual(crypt_meta_allocs[0], 0)
-        self.assertGreater(crypt_meta_allocs[1], 0)
-
     def _check_integrity_meta_allocs(self, metadata):
         """
         Check that all integrity_meta_allocs exist and have non-zero length.
@@ -331,7 +355,7 @@ def run_check(self, stop_time):
                     self._check_thin_meta_allocations(written)
 
                     self._check_encryption_information_consistency(object_path, written)
-                    self._check_crypt_meta_allocs(written)
+                    self._check_cap_meta_allocations(written)
 
                     self._check_integrity_meta_allocs(written)