From: xie xingguo <xie.xingguo@zte.com.cn>
Date: Fri, 29 Jan 2016 10:01:19 +0000 (+0800)
Subject: kstore: add fast check against empty list
X-Git-Tag: v10.0.4~110^2~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=06ad7849511e6255ea5d75489c8c8671b3e2938b;p=ceph.git

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 28631cd8fc00..895ea1562ddf 100644
--- 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;