sbd_flush_data_cache
sret = sbd_flush_data_cache(sl, 1);
(sbd_flush_data_cache(sl, 0) != SBD_SUCCESS)) {
sret = sbd_flush_data_cache(sl, 0);
(sbd_flush_data_cache(sl, 0) != SBD_SUCCESS)) {
sbd_status_t sbd_flush_data_cache(sbd_lu_t *sl, int fsync_done);