Cleanup verify headers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/verify.h b/verify.h
new file mode 100644
index 0000000..76d256d
--- /dev/null
+++ b/verify.h
@@ -0,0 +1,68 @@
+#ifndef FIO_VERIFY_H
+#define FIO_VERIFY_H
+
+#define FIO_HDR_MAGIC	0xf00baaef
+
+enum {
+	VERIFY_NONE = 0,		/* no verification */
+	VERIFY_MD5,			/* md5 sum data blocks */
+	VERIFY_CRC64,			/* crc64 sum data blocks */
+	VERIFY_CRC32,			/* crc32 sum data blocks */
+	VERIFY_CRC32C,			/* crc32c sum data blocks */
+	VERIFY_CRC32C_INTEL,		/* crc32c sum data blocks with hw */
+	VERIFY_CRC16,			/* crc16 sum data blocks */
+	VERIFY_CRC7,			/* crc7 sum data blocks */
+	VERIFY_SHA256,			/* sha256 sum data blocks */
+	VERIFY_SHA512,			/* sha512 sum data blocks */
+	VERIFY_META,			/* block_num, timestamp etc. */
+	VERIFY_NULL,			/* pretend to verify */
+};
+
+/*
+ * A header structure associated with each checksummed data block. It is
+ * followed by a checksum specific header that contains the verification
+ * data.
+ */
+struct verify_header {
+	unsigned int fio_magic;
+	unsigned int len;
+	unsigned int verify_type;
+};
+
+struct vhdr_md5 {
+	uint32_t md5_digest[16];
+};
+struct vhdr_sha512 {
+	uint8_t sha512[128];
+};
+struct vhdr_sha256 {
+	uint8_t sha256[128];
+};
+struct vhdr_crc64 {
+	uint64_t crc64;
+};
+struct vhdr_crc32 {
+	uint32_t crc32;
+};
+struct vhdr_crc16 {
+	uint16_t crc16;
+};
+struct vhdr_crc7 {
+	uint8_t crc7;
+};
+struct vhdr_meta {
+	uint64_t offset;
+	unsigned char thread;
+	unsigned short numberio;
+	unsigned long time_sec;
+	unsigned long time_usec;
+};
+
+/*
+ * Verify helpers
+ */
+extern void populate_verify_io_u(struct thread_data *, struct io_u *);
+extern int __must_check get_next_verify(struct thread_data *td, struct io_u *);
+extern int __must_check verify_io_u(struct thread_data *, struct io_u *);
+
+#endif