mds: fix CInode::get_approx_dirfrag

return NULL if there is no opened dirfrag

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

diff --git a/src/mds/CInode.cc b/src/mds/CInode.cc
index 2f66ab4acbb8120f443e3f26283a94156f41e379..e475dfb2a17674f574f4c53205441f0f1f3dd1fa 100644 (file)
--- a/src/mds/CInode.cc
+++ b/src/mds/CInode.cc
@@ -534,11 +534,12 @@ CDir *CInode::get_approx_dirfrag(frag_t fg)
     return ls.front();
 
   // try parents?
-  while (1) {
+  while (fg.bits() > 0) {
     fg = fg.parent();
     dir = get_dirfrag(fg);
     if (dir) return dir;
   }
+  return NULL;
 }      
 
 void CInode::get_dirfrags(list<CDir*>& ls)