LXR uboot/fs/zfs/zfs

   1/*
   2 *  GRUB  --  GRand Unified Bootloader
   3 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7/*
   8 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   9 * Use is subject to license terms.
  10 */
  11
  12#include <common.h>
  13#include <malloc.h>
  14#include <linux/stat.h>
  15#include <linux/time.h>
  16#include <linux/ctype.h>
  17#include <asm/byteorder.h>
  18#include "zfs_common.h"
  19
  20#include <zfs/zfs.h>
  21#include <zfs/zio.h>
  22#include <zfs/dnode.h>
  23#include <zfs/uberblock_impl.h>
  24#include <zfs/vdev_impl.h>
  25#include <zfs/zio_checksum.h>
  26#include <zfs/zap_impl.h>
  27#include <zfs/zap_leaf.h>
  28#include <zfs/zfs_znode.h>
  29#include <zfs/dmu.h>
  30#include <zfs/dmu_objset.h>
  31#include <zfs/dsl_dir.h>
  32#include <zfs/dsl_dataset.h>
  33
  34void
  35fletcher_2_endian(const void *buf, uint64_t size,
  36                                  zfs_endian_t endian,
  37                                  zio_cksum_t *zcp)
  38{
  39        const uint64_t *ip = buf;
  40        const uint64_t *ipend = ip + (size / sizeof(uint64_t));
  41        uint64_t a0, b0, a1, b1;
  42
  43        for (a0 = b0 = a1 = b1 = 0; ip < ipend; ip += 2) {
  44                a0 += zfs_to_cpu64(ip[0], endian);
  45                a1 += zfs_to_cpu64(ip[1], endian);
  46                b0 += a0;
  47                b1 += a1;
  48        }
  49
  50        zcp->zc_word[0] = cpu_to_zfs64(a0, endian);
  51        zcp->zc_word[1] = cpu_to_zfs64(a1, endian);
  52        zcp->zc_word[2] = cpu_to_zfs64(b0, endian);
  53        zcp->zc_word[3] = cpu_to_zfs64(b1, endian);
  54}
  55
  56void
  57fletcher_4_endian(const void *buf, uint64_t size, zfs_endian_t endian,
  58                                  zio_cksum_t *zcp)
  59{
  60        const uint32_t *ip = buf;
  61        const uint32_t *ipend = ip + (size / sizeof(uint32_t));
  62        uint64_t a, b, c, d;
  63
  64        for (a = b = c = d = 0; ip < ipend; ip++) {
  65                a += zfs_to_cpu32(ip[0], endian);
  66                b += a;
  67                c += b;
  68                d += c;
  69        }
  70
  71        zcp->zc_word[0] = cpu_to_zfs64(a, endian);
  72        zcp->zc_word[1] = cpu_to_zfs64(b, endian);
  73        zcp->zc_word[2] = cpu_to_zfs64(c, endian);
  74        zcp->zc_word[3] = cpu_to_zfs64(d, endian);
  75}
  76