librbd: open parent as read-only during clone

We never write to the parent, and don't need to watch it during this process.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/src/librbd/internal.cc b/src/librbd/internal.cc
index 7d49e82d3292dfe79f39511486bb376052ec5226..53ce19c65fc6caff1a9cd84c3366208cbf70e099 100644 (file)
--- a/src/librbd/internal.cc
+++ b/src/librbd/internal.cc
@@ -897,7 +897,7 @@ reprotect_and_return_err:
     librbd::NoOpProgressContext no_op;
     ImageCtx *c_imctx = NULL;
     // make sure parent snapshot exists
-    ImageCtx *p_imctx = new ImageCtx(p_name, "", p_snap_name, p_ioctx, false);
+    ImageCtx *p_imctx = new ImageCtx(p_name, "", p_snap_name, p_ioctx, true);
     r = open_image(p_imctx);
     if (r < 0) {
       lderr(cct) << "error opening parent image: "