sr_crypto_prepare
crwu = sr_crypto_prepare(wu, mdd_crypto, 1);
crwu = sr_crypto_prepare(wu, mdd_crypto, 0);
struct sr_crypto_wu *sr_crypto_prepare(struct sr_workunit *,
crwu = sr_crypto_prepare(wu, &mdd_raid1c->sr1c_crypto, 1);
extern struct sr_crypto_wu *sr_crypto_prepare(struct sr_workunit *,