Include crypt metadata in total_physical_used

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

src/engine/strat_engine/backstore/backstore/v2.rs

@@ -888,6 +888,12 @@ impl Backstore {
         self.data_tier.metadata_size()
     }
 
+    /// Return the space used for crypt meta data. This space is rather hybrid,
+    /// because it is a component of allocated space but it is also metadata.
+    pub fn datatier_crypt_meta_size(&self) -> CryptMetaSize {
+        self.crypt_meta_allocs.as_slice().into()
+    }
+
     /// Write the given data to the data tier's devices.
     pub fn save_state(&mut self, metadata: &[u8]) -> StratisResult<()> {
         self.data_tier.save_state(metadata)

src/engine/strat_engine/pool/v2.rs

@@ -1031,7 +1031,7 @@ impl Pool for StratPool {
         // event of, e.g, VDO, the amount will be far too large to be useful.
         self.thin_pool
             .total_physical_used()
-            .map(|u| u + self.metadata_size)
+            .map(|u| u + self.metadata_size + self.backstore.datatier_crypt_meta_size().sectors())
     }
 
     fn filesystems(&self) -> Vec<(Name, FilesystemUuid, &dyn Filesystem)> {