dm: Add scaffolding to change completion function signature

This patch adds temporary scaffolding so that the Crypto API
completion function can take a void * instead of crypto_async_request.
Once affected users have been converted this can be removed.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/md/dm-crypt.c

@@ -1458,8 +1458,7 @@ static int crypt_convert_block_skcipher(struct crypt_config *cc,
 	return r;
 }
 
-static void kcryptd_async_done(struct crypto_async_request *async_req,
-			       int error);
+static void kcryptd_async_done(crypto_completion_data_t *async_req, int error);
 
 static int crypt_alloc_req_skcipher(struct crypt_config *cc,
 				     struct convert_context *ctx)
@@ -2147,10 +2146,9 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
 	crypt_dec_pending(io);
 }
 
-static void kcryptd_async_done(struct crypto_async_request *async_req,
-			       int error)
+static void kcryptd_async_done(crypto_completion_data_t *data, int error)
 {
-	struct dm_crypt_request *dmreq = async_req->data;
+	struct dm_crypt_request *dmreq = crypto_get_completion_data(data);
 	struct convert_context *ctx = dmreq->ctx;
 	struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx);
 	struct crypt_config *cc = io->cc;

drivers/md/dm-integrity.c

@@ -955,9 +955,9 @@ static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned sectio
 	async_tx_issue_pending_all();
 }
 
-static void complete_journal_encrypt(struct crypto_async_request *req, int err)
+static void complete_journal_encrypt(crypto_completion_data_t *data, int err)
 {
-	struct journal_completion *comp = req->data;
+	struct journal_completion *comp = crypto_get_completion_data(data);
 	if (unlikely(err)) {
 		if (likely(err == -EINPROGRESS)) {
 			complete(&comp->ic->crypto_backoff);