diff --git a/src/engine/strat_engine/backstore/backstore/v2.rs b/src/engine/strat_engine/backstore/backstore/v2.rs
index 3249ddfacc..3dc00489c8 100644
--- a/src/engine/strat_engine/backstore/backstore/v2.rs
+++ b/src/engine/strat_engine/backstore/backstore/v2.rs
@@ -166,17 +166,17 @@ impl InternalBackstore for Backstore {
     }
 
     fn datatier_allocated_size(&self) -> Sectors {
-        self.data_tier.allocated()
+        self.allocs.iter().map(|(_, length)| *length).sum()
     }
 
     fn datatier_usable_size(&self) -> Sectors {
-        self.data_tier.usable_size() - self.crypt_meta_allocs.iter().map(|(_, len)| *len).sum()
+        self.data_tier.usable_size() - self.datatier_crypt_meta_size()
     }
 
     fn available_in_backstore(&self) -> Sectors {
         self.data_tier.usable_size()
-            - self.allocs.iter().map(|(_, len)| *len).sum()
-            - self.crypt_meta_allocs.iter().map(|(_, len)| *len).sum()
+            - self.datatier_allocated_size()
+            - self.datatier_crypt_meta_size()
     }
 
     fn alloc(
@@ -218,12 +218,6 @@ impl InternalBackstore for Backstore {
 }
 
 impl Backstore {
-    /// Calculate size allocated to data and not metadata in the backstore.
-    #[cfg(test)]
-    pub fn data_alloc_size(&self) -> Sectors {
-        self.allocs.iter().map(|(_, length)| *length).sum()
-    }
-
     /// Calculate next from all of the metadata and data allocations present in the backstore.
     fn calc_next_cache(&self) -> StratisResult<Sectors> {
         let mut all_allocs = if self.allocs.is_empty() {
@@ -858,6 +852,22 @@ impl Backstore {
         self.data_tier.metadata_size()
     }
 
+    /// The space for the crypt meta device is allocated for the data tier,
+    /// but not directly from the devices of the data tier. Although it is,
+    /// strictly speaking, metadata, it is not included in the
+    /// datatier_metadata_size() result, which only includes metadata
+    /// allocated directly from the data tier.
+    /// The space is included in the datatier_allocated() result, since it is
+    /// allocated from the assembled devices of the data tier.
+    fn datatier_crypt_meta_size(&self) -> Sectors {
+        self.crypt_meta_allocs.iter().map(|(_, len)| *len).sum()
+    }
+
+    /// Metadata size on the data tier, including crypt metadata space.
+    pub fn datatier_all_metadata_size(&self) -> Sectors {
+        self.datatier_crypt_meta_size() + self.datatier_metadata_size()
+    }
+
     /// 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)
diff --git a/src/engine/strat_engine/pool/v2.rs b/src/engine/strat_engine/pool/v2.rs
index 2a45991d76..107581ea4b 100644
--- a/src/engine/strat_engine/pool/v2.rs
+++ b/src/engine/strat_engine/pool/v2.rs
@@ -195,7 +195,7 @@ impl StratPool {
             }
         };
 
-        let metadata_size = backstore.datatier_metadata_size();
+        let metadata_size = backstore.datatier_all_metadata_size();
         let mut pool = StratPool {
             backstore,
             thin_pool: thinpool,
@@ -267,7 +267,7 @@ impl StratPool {
         let mut needs_save = metadata.thinpool_dev.fs_limit.is_none()
             || metadata.thinpool_dev.feature_args.is_none();
 
-        let metadata_size = backstore.datatier_metadata_size();
+        let metadata_size = backstore.datatier_all_metadata_size();
         let mut pool = StratPool {
             backstore,
             thin_pool: thinpool,
@@ -1249,7 +1249,7 @@ impl<'a> DumpState<'a> for StratPool {
     }
 
     fn dump(&mut self, _: Self::DumpInput) -> Self::State {
-        self.metadata_size = self.backstore.datatier_metadata_size();
+        self.metadata_size = self.backstore.datatier_all_metadata_size();
         StratPoolState {
             metadata_size: self.metadata_size.bytes(),
             out_of_alloc_space: self.thin_pool.out_of_alloc_space(),
diff --git a/src/engine/strat_engine/thinpool/thinpool.rs b/src/engine/strat_engine/thinpool/thinpool.rs
index 74f25af1e7..5c380d6dad 100644
--- a/src/engine/strat_engine/thinpool/thinpool.rs
+++ b/src/engine/strat_engine/thinpool/thinpool.rs
@@ -2977,7 +2977,7 @@ mod tests {
                 .unwrap()
             );
             assert_eq!(
-                backstore.data_alloc_size(),
+                backstore.datatier_allocated_size(),
                 pool.thin_pool.data_dev().size()
                     + pool.thin_pool.meta_dev().size() * 2u64
                     + pool.mdv.device().size()