LXR uboot/fs/zfs/zfs

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