ceph_mds_check_access
err = ceph_mds_check_access(mdsc, path, MAY_WRITE);
err = ceph_mds_check_access(mdsc, path, mask);
err = ceph_mds_check_access(mdsc, path, mask);
err = ceph_mds_check_access(mdsc, path, MAY_WRITE);
extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,