ocfs2_double_lock
status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
static int ocfs2_double_lock(struct ocfs2_super *osb,
DEFINE_OCFS2_ULL_ULL_EVENT(ocfs2_double_lock);