librbd: object_may_exist always return true when you write an empty object

if you write an empty object, object map is updated firstly

Signed-off-by: xinxin shu <shuxinxin@chinac.com>

diff --git a/src/librbd/AioObjectRequest.cc b/src/librbd/AioObjectRequest.cc
index 77aaa7e1f61f9ec01c7a3020e058c9d9959ccd24..f2303010a5d78488f3d78eb1ea26f5b25159bd68 100644 (file)
--- a/src/librbd/AioObjectRequest.cc
+++ b/src/librbd/AioObjectRequest.cc
@@ -538,7 +538,7 @@ namespace librbd {
     RWLock::RLocker snap_locker(m_ictx->snap_lock);
     if (m_ictx->enable_alloc_hint &&
         (m_ictx->object_map == nullptr ||
-         !m_ictx->object_map->object_may_exist(m_object_no))) {
+         !m_object_exist)) {
       wr->set_alloc_hint(m_ictx->get_object_size(), m_ictx->get_object_size());
     }