CEPH_PGID_ENCODING_LEN
if (!ceph_has_room(p, end, CEPH_PGID_ENCODING_LEN)) {
ceph_start_encoding(p, 1, 1, CEPH_PGID_ENCODING_LEN + 1);
CEPH_PGID_ENCODING_LEN + 1];
CEPH_PGID_ENCODING_LEN + 1; /* spgid */
CEPH_PGID_ENCODING_LEN + 1; /* spgid */