kstore: add fast check against empty list

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/os/kstore/KStore.cc b/src/os/kstore/KStore.cc
index 28631cd8fc00f11f51e18f865edb9f7291871aaf..895ea1562ddf38f2b64ba6098efcd8a23d14d128 100644 (file)
--- a/src/os/kstore/KStore.cc
+++ b/src/os/kstore/KStore.cc
@@ -544,6 +544,9 @@ int KStore::OnodeHashLRU::trim(int max)
           << " size " << onode_map.size() << dendl;
   int trimmed = 0;
   int num = onode_map.size() - max;
+  if (onode_map.size() == 0 || num <= 0)
+    return 0; // don't even try
+
   lru_list_t::iterator p = lru.end();
   if (num)
     --p;