ocfs2_qinfo_lock
int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
status = ocfs2_qinfo_lock(oinfo, 0);
err = ocfs2_qinfo_lock(info, 1);
err = ocfs2_qinfo_lock(info, freeing);
status = ocfs2_qinfo_lock(info, 0);
status = ocfs2_qinfo_lock(info, ex);
status = ocfs2_qinfo_lock(info, 0);