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
  26 static 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
  35 static 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