SERVER-29370 Update UUIDs when featureCompatibilityVersion is changed

This patch ensures collections have UUIDs when
featureCompatibilityVersion is 3.6 and collections do not have UUIDs
when featureCompatibilityVersion is 3.4 (or below).

1 files changed, 13 insertions, 0 deletions

diff --git a/src/mongo/db/catalog/coll_mod.h b/src/mongo/db/catalog/coll_mod.h
index 456103f4c2f..8a6eda14f46 100644
--- a/src/mongo/db/catalog/coll_mod.h
+++ b/src/mongo/db/catalog/coll_mod.h
@@ -28,6 +28,7 @@
 
 #include "mongo/base/status.h"
 #include "mongo/base/status_with.h"
+#include "mongo/db/catalog/collection_options.h"
 
 namespace mongo {
 class BSONObj;
@@ -36,6 +37,8 @@ class Collection;
 class NamespaceString;
 class OperationContext;
 
+void updateUUIDSchemaVersion(OperationContext* opCtx, bool upgrade);
+
 /**
  * Performs the collection modification described in "cmdObj" on the collection "ns".
  */
@@ -43,4 +46,14 @@ Status collMod(OperationContext* opCtx,
                const NamespaceString& ns,
                const BSONObj& cmdObj,
                BSONObjBuilder* result);
+
+/*
+ * Adds uuid to the collection "ns" if uuid exists and removes any existing UUID from
+ * the collection "ns" if uuid is boost::none. This is called in circumstances where
+ * we may be upgrading or downgrading and we need to update the UUID.
+ */
+Status collModForUUIDUpgrade(OperationContext* opCtx,
+                             const NamespaceString& ns,
+                             const BSONObj& cmdObj,
+                             OptionalCollectionUUID uuid);
 }  // namespace mongo