librbd: debug when copy occurs

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

diff --git a/src/librbd/internal.cc b/src/librbd/internal.cc
index eed21b988cb19ebf3daa607e309c46a999e7af6d..d68d196f0d4f2f78e973090cc06ffa6682a0beb0 100644 (file)
--- a/src/librbd/internal.cc
+++ b/src/librbd/internal.cc
@@ -1720,6 +1720,9 @@ reprotect_and_return_err:
           ProgressContext &prog_ctx)
   {
     CephContext *cct = (CephContext *)dest_md_ctx.cct();
+    ldout(cct, 20) << "copy " << src->name
+                  << (src->snap_name.length() ? "@" + src->snap_name : "")
+                  << " -> " << destname << dendl;
     int order = src->order;
 
     src->md_lock.Lock();