From: fang yuxiang <fang.yuxiang@eisoo.com>
Date: Wed, 3 May 2017 05:46:50 +0000 (+0800)
Subject: rgw: don't do unneccesary write if buffer with zero length
X-Git-Tag: v12.0.3~60^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=4e21f7ea2167be7793273f31faeb0aa95f0fa30a;p=ceph.git

rgw: don't do unneccesary write if buffer with zero length

Don't do unneccesary write if buffer with zero length,
or there will be one more shadow stripe rados object with size 0

Signed-off-by: fang yuxiang <fang.yuxiang@eisoo.com>
---

diff --git a/src/rgw/rgw_rados.cc b/src/rgw/rgw_rados.cc
index dd09479cb752..7069fe4cd987 100644
--- a/src/rgw/rgw_rados.cc
+++ b/src/rgw/rgw_rados.cc
@@ -2563,6 +2563,9 @@ int RGWPutObjProcessor_Atomic::write_data(bufferlist& bl, off_t ofs, void **phan
 
   *pobj = cur_obj;
 
+  if (!bl.length())
+    return 0;
+
   return RGWPutObjProcessor_Aio::handle_obj_data(cur_obj, bl, ofs - cur_part_ofs, ofs, phandle, exclusive);
 }