CEPH_NOHASH_NAME_MAX
cryptbuf = kmalloc(len > CEPH_NOHASH_NAME_MAX ? NAME_MAX : len,
if (len > CEPH_NOHASH_NAME_MAX) {
u8 *extra = cryptbuf + CEPH_NOHASH_NAME_MAX;
sha256(extra, len - CEPH_NOHASH_NAME_MAX, hash);
len = CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE;
if (len <= CEPH_NOHASH_NAME_MAX) {