New upstream version 0.7.2

[mirror_zfs-debian.git] / include / sys / spa_checksum.h

diff --git a/include/sys/spa_checksum.h b/include/sys/spa_checksum.h
new file mode 100644 (file)
index 0000000..b879901
--- /dev/null
+++ b/include/sys/spa_checksum.h
@@ -0,0 +1,72 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef        _SPA_CHECKSUM_H
+#define        _SPA_CHECKSUM_H
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
+ */
+typedef struct zio_cksum {
+       uint64_t        zc_word[4];
+} zio_cksum_t;
+
+#define        ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)   \
+{                                              \
+       (zcp)->zc_word[0] = w0;                 \
+       (zcp)->zc_word[1] = w1;                 \
+       (zcp)->zc_word[2] = w2;                 \
+       (zcp)->zc_word[3] = w3;                 \
+}
+
+#define        ZIO_CHECKSUM_EQUAL(zc1, zc2) \
+       (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
+       ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
+       ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
+       ((zc1).zc_word[3] - (zc2).zc_word[3])))
+
+#define        ZIO_CHECKSUM_IS_ZERO(zc) \
+       (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
+       (zc)->zc_word[2] | (zc)->zc_word[3]))
+
+#define        ZIO_CHECKSUM_BSWAP(zcp)                                 \
+{                                                              \
+       (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]);        \
+       (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]);        \
+       (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]);        \
+       (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]);        \
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif