Merge pull request ceph#66022 from Jayaprakash-ibm/wip-nref-opt

os/bluestore: Optimize Blob::put() for single-reference fast path

Author: SrinivasaBharath

src/os/bluestore/BlueStore.h

@@ -762,6 +762,10 @@ class BlueStore : public ObjectStore,
       ++nref;
     }
     void put() {
+      if (nref.load(std::memory_order_acquire) == 1) {
+        delete this;
+        return;
+      }
       if (--nref == 0)
 	delete this;
     }