ceph: initialize fields on new dentry_infos

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 67bbb41..6e4f43f 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -46,7 +46,7 @@
 	else
 		dentry->d_op = &ceph_snap_dentry_ops;
 
-	di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS);
+	di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
 	if (!di)
 		return -ENOMEM;          /* oh well */