v4.19.13 snapshot.
diff --git a/include/linux/crc-t10dif.h b/include/linux/crc-t10dif.h
new file mode 100644
index 0000000..1fe0cfc
--- /dev/null
+++ b/include/linux/crc-t10dif.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_CRC_T10DIF_H
+#define _LINUX_CRC_T10DIF_H
+
+#include <linux/types.h>
+
+#define CRC_T10DIF_DIGEST_SIZE 2
+#define CRC_T10DIF_BLOCK_SIZE 1
+
+extern __u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer,
+ size_t len);
+extern __u16 crc_t10dif(unsigned char const *, size_t);
+extern __u16 crc_t10dif_update(__u16 crc, unsigned char const *, size_t);
+
+#endif