LXR linux/fs/btrfs/math.h

   1
   2/*
   3 * Copyright (C) 2012 Fujitsu.  All rights reserved.
   4 * Written by Miao Xie <miaox@cn.fujitsu.com>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public
   8 * License v2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public
  16 * License along with this program; if not, write to the
  17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 * Boston, MA 021110-1307, USA.
  19 */
  20
  21#ifndef __BTRFS_MATH_H
  22#define __BTRFS_MATH_H
  23
  24#include <asm/div64.h>
  25
  26static inline u64 div_factor(u64 num, int factor)
  27{
  28        if (factor == 10)
  29                return num;
  30        num *= factor;
  31        do_div(num, 10);
  32        return num;
  33}
  34
  35static inline u64 div_factor_fine(u64 num, int factor)
  36{
  37        if (factor == 100)
  38                return num;
  39        num *= factor;
  40        do_div(num, 100);
  41        return num;
  42}
  43
  44#endif
  45