Merge pull request ceph#65317 from xxhdx1985126/wip-72790

crimson/osd/pg_backend: tolerate enoent for both head and clone when doing rollback

Reviewed-by: Matan Breizman <[email protected]>

Author: athanatos

src/crimson/osd/pg_backend.cc

@@ -833,7 +833,14 @@ PGBackend::rollback_iertr::future<> PGBackend::rollback(
                      " because got ENOENT|whiteout on obc lookup",
                      os.oi.soid, snapid);
       return remove(os, txn, osd_op_params, delta_stats,
-                    should_whiteout(ss, snapc), os.oi.size);
+                    should_whiteout(ss, snapc), os.oi.size
+      ).handle_error_interruptible(
+	crimson::ct_error::enoent::handle([] {
+	  // We consider rolling back a non-existing head to
+	  // non-existing clone as a no-op.
+	  return rollback_iertr::now();
+	})
+      );
     }),
     rollback_ertr::pass_further{},
     crimson::ct_error::assert_all{"unexpected error in rollback"}