os/KeyValueDB: return -ENOENT if key doesn't exist

Previous code return 0 in all cases, caller doesn't
know if the key is exists in the db.

Signed-off-by: Xiaoxi Chen <xiaoxi.chen@intel.com>

diff --git a/src/os/KeyValueDB.h b/src/os/KeyValueDB.h
index 80fdceca81658f541b301c2792dbdcfa49289bfa..028243667dbb1c5665d662784383bfeec0bcccd0 100644 (file)
--- a/src/os/KeyValueDB.h
+++ b/src/os/KeyValueDB.h
@@ -93,7 +93,12 @@ public:
     ks.insert(key);
     map<string,bufferlist> om;
     int r = get(prefix, ks, &om);
-    *value = om[key];
+    if (om.find(key) != om.end()) {
+      *value = om[key];
+    } else {
+      *value = bufferlist();
+      r = -ENOENT;
+    }
     return r;
   }