FSCRYPT_MODE_MAX
struct fscrypt_prepared_key mk_direct_keys[FSCRYPT_MODE_MAX + 1];
struct fscrypt_prepared_key mk_iv_ino_lblk_64_keys[FSCRYPT_MODE_MAX + 1];
struct fscrypt_prepared_key mk_iv_ino_lblk_32_keys[FSCRYPT_MODE_MAX + 1];
for (i = 0; i <= FSCRYPT_MODE_MAX; i++) {
if (WARN_ON_ONCE(mode_num > FSCRYPT_MODE_MAX))
BUILD_BUG_ON(ARRAY_SIZE(fscrypt_modes) != FSCRYPT_MODE_MAX + 1);