[#1176] metabase: Ignore locked objs in `IterateCoveredByTombstones`

Make `DB.IterateCoveredByTombstones` to not pass locked objects to the
handler. The method is used by GC, therefore it will not consider locked
objects as candidates for deletion even if their tombstone is expired.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/metabase/iterators.go

@@ -112,7 +112,8 @@ func (db *DB) iterateExpired(tx *bbolt.Tx, epoch uint64, h ExpiredObjectHandler)
 }
 
 // IterateCoveredByTombstones iterates over all objects in DB which are covered
-// by tombstone with string address from tss.
+// by tombstone with string address from tss. Locked objects are not included
+// (do not confuse with objects of type LOCK).
 //
 // If h returns ErrInterruptIterator, nil returns immediately.
 // Returns other errors of h directly.
@@ -137,6 +138,10 @@ func (db *DB) iterateCoveredByTombstones(tx *bbolt.Tx, tss map[string]*addressSD
 				return fmt.Errorf("could not parse address of the object under tombstone: %w", err)
 			}
 
+			if objectLocked(tx, *addr.ContainerID(), *addr.ObjectID()) {
+				return nil
+			}
+
 			return h(addr)
 		}
 

pkg/local_object_storage/metabase/iterators_test.go

@@ -72,6 +72,7 @@ func TestDB_IterateCoveredByTombstones(t *testing.T) {
 	ts := generateAddress()
 	protected1 := generateAddress()
 	protected2 := generateAddress()
+	protectedLocked := generateAddress()
 	garbage := generateAddress()
 
 	prm := new(meta.InhumePrm)
@@ -80,7 +81,7 @@ func TestDB_IterateCoveredByTombstones(t *testing.T) {
 
 	_, err = db.Inhume(prm.
 		WithTombstoneAddress(ts).
-		WithAddresses(protected1, protected2),
+		WithAddresses(protected1, protected2, protectedLocked),
 	)
 	require.NoError(t, err)
 
@@ -88,6 +89,7 @@ func TestDB_IterateCoveredByTombstones(t *testing.T) {
 		WithAddresses(garbage).
 		WithGCMark(),
 	)
+	require.NoError(t, err)
 
 	var handled []*addressSDK.Address
 
@@ -101,7 +103,22 @@ func TestDB_IterateCoveredByTombstones(t *testing.T) {
 	})
 	require.NoError(t, err)
 
-	require.Len(t, handled, 2)
+	require.Len(t, handled, 3)
 	require.Contains(t, handled, protected1)
 	require.Contains(t, handled, protected2)
+	require.Contains(t, handled, protectedLocked)
+
+	err = db.Lock(*protectedLocked.ContainerID(), *generateAddress().ObjectID(), []oid.ID{*protectedLocked.ObjectID()})
+	require.NoError(t, err)
+
+	handled = handled[:0]
+
+	err = db.IterateCoveredByTombstones(tss, func(addr *addressSDK.Address) error {
+		handled = append(handled, addr)
+		return nil
+	})
+	require.NoError(t, err)
+
+	require.Len(t, handled, 2)
+	require.NotContains(t, handled, protectedLocked)
 }