STEP_DECRYPT
case STEP_DECRYPT:
if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
post_read_steps |= 1 << STEP_DECRYPT;
post_read_steps |= STEP_DECRYPT;
if ((ctx->enabled_steps & STEP_DECRYPT) && !fscrypt_decrypt_bio(bio)) {
(STEP_DECRYPT | STEP_DECOMPRESS);