WIP Send additional fsyncs from secondary OSDs to primaries to prevent lockups

src/blockstore.cpp

@@ -82,3 +82,8 @@ uint32_t blockstore_t::get_bitmap_granularity()
 {
     return impl->get_bitmap_granularity();
 }
+
+bool blockstore_t::wants_fsync()
+{
+    return impl->wants_fsync();
+}