CEPH_MAX_MDS
unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
#define CEPH_MDS_INO_MDSDIR_OFFSET (1 * CEPH_MAX_MDS)
#define CEPH_MDS_INO_LOG_OFFSET (2 * CEPH_MAX_MDS)
#define CEPH_INO_SYSTEM_BASE ((6*CEPH_MAX_MDS) + (CEPH_MAX_MDS * CEPH_NUM_STRAY))