ceph_gcm_nonce
#define CEPH_GCM_IV_LEN sizeof(struct ceph_gcm_nonce)
struct ceph_gcm_nonce in_gcm_nonce;
struct ceph_gcm_nonce out_gcm_nonce;
static void gcm_inc_nonce(struct ceph_gcm_nonce *nonce)
struct ceph_gcm_nonce *nonce;