From: xie xingguo <xie.xingguo@zte.com.cn>
Date: Fri, 29 Jan 2016 10:05:27 +0000 (+0800)
Subject: BlueStore: add fast check against empty list
X-Git-Tag: v10.0.4~110^2~3
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=b0bed156dae5666b1f53fb735c517e390194d03d;p=ceph.git

BlueStore: add fast check against empty list

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

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 3a02b17ffb84..f2e422e19ccd 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -596,6 +596,9 @@ int BlueStore::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;