librbd: add a constant for single-client-only features

This way it's easy to disable them if you want to access an image from
multiple clients.

Signed-off-by: Josh Durgin <jdurgin@redhat.com>

diff --git a/src/include/rbd/features.h b/src/include/rbd/features.h
index 34d688d7b46aec9377291503fbacd1a7f1baf0bd..b597bc089136bc158e24176b3698cbb9e67a03ea 100644 (file)
--- a/src/include/rbd/features.h
+++ b/src/include/rbd/features.h
@@ -28,4 +28,8 @@
                                          RBD_FEATURE_OBJECT_MAP     | \
                                          RBD_FEATURE_FAST_DIFF)
 
+#define RBD_FEATURES_SINGLE_CLIENT (RBD_FEATURE_EXCLUSIVE_LOCK | \
+                                    RBD_FEATURE_OBJECT_MAP     | \
+                                    RBD_FEATURE_FAST_DIFF)
+
 #endif