1 files changed, 87 insertions, 0 deletions
diff --git a/fs/zfs/zfs_fletcher.c b/fs/zfs/zfs_fletcher.c
new file mode 100644
index 0000000000..08f708ca96
--- /dev/null
+++ b/fs/zfs/zfs_fletcher.c
@@ -0,0 +1,87 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include "zfs_common.h"
+
+#include <zfs/zfs.h>
+#include <zfs/zio.h>
+#include <zfs/dnode.h>
+#include <zfs/uberblock_impl.h>
+#include <zfs/vdev_impl.h>
+#include <zfs/zio_checksum.h>
+#include <zfs/zap_impl.h>
+#include <zfs/zap_leaf.h>
+#include <zfs/zfs_znode.h>
+#include <zfs/dmu.h>
+#include <zfs/dmu_objset.h>
+#include <zfs/dsl_dir.h>
+#include <zfs/dsl_dataset.h>
+
+void
+fletcher_2_endian(const void *buf, uint64_t size,
+				  zfs_endian_t endian,
+				  zio_cksum_t *zcp)
+{
+	const uint64_t *ip = buf;
+	const uint64_t *ipend = ip + (size / sizeof(uint64_t));
+	uint64_t a0, b0, a1, b1;
+
+	for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
+		a0 += zfs_to_cpu64(ip[0], endian);
+		a1 += zfs_to_cpu64(ip[1], endian);
+		b0 += a0;
+		b1 += a1;
+	}
+
+	zcp->zc_word[0] = cpu_to_zfs64(a0, endian);
+	zcp->zc_word[1] = cpu_to_zfs64(a1, endian);
+	zcp->zc_word[2] = cpu_to_zfs64(b0, endian);
+	zcp->zc_word[3] = cpu_to_zfs64(b1, endian);
+}
+
+void
+fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian,
+				  zio_cksum_t *zcp)
+{
+	const uint32_t *ip = buf;
+	const uint32_t *ipend = ip + (size / sizeof(uint32_t));
+	uint64_t a, b, c, d;
+
+	for (a = b = c = d = 0; ip < ipend; ip++) {
+		a += zfs_to_cpu32(ip[0], endian);
+		b += a;
+		c += b;
+		d += c;
+	}
+
+	zcp->zc_word[0] = cpu_to_zfs64(a, endian);
+	zcp->zc_word[1] = cpu_to_zfs64(b, endian);
+	zcp->zc_word[2] = cpu_to_zfs64(c, endian);
+	zcp->zc_word[3] = cpu_to_zfs64(d, endian);
+}