From: Sage Weil <sage@redhat.com>
Date: Mon, 20 Jun 2016 13:53:46 +0000 (-0400)
Subject: os/memstore: zero-length write should not effect object size
X-Git-Tag: v11.0.0~110^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=22464d3f262be69ed199b7d7c917ffaf82a4c0f0;p=ceph.git

os/memstore: zero-length write should not effect object size

Signed-off-by: Sage Weil <sage@redhat.com>
---

diff --git a/src/os/memstore/MemStore.cc b/src/os/memstore/MemStore.cc
index f96d472392854..9d0a1714ad5d5 100644
--- a/src/os/memstore/MemStore.cc
+++ b/src/os/memstore/MemStore.cc
@@ -1035,9 +1035,11 @@ int MemStore::_write(const coll_t& cid, const ghobject_t& oid,
     return -ENOENT;
 
   ObjectRef o = c->get_or_create_object(oid);
-  const ssize_t old_size = o->get_size();
-  o->write(offset, bl);
-  used_bytes += (o->get_size() - old_size);
+  if (len > 0) {
+    const ssize_t old_size = o->get_size();
+    o->write(offset, bl);
+    used_bytes += (o->get_size() - old_size);
+  }
 
   return 0;
 }