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Linux Cross Reference
Linux/fs/ext2/bitmap.c

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 /*
  2  *  linux/fs/ext2/bitmap.c
  3  *
  4  * Copyright (C) 1992, 1993, 1994, 1995
  5  * Remy Card (card@masi.ibp.fr)
  6  * Laboratoire MASI - Institut Blaise Pascal
  7  * Universite Pierre et Marie Curie (Paris VI)
  8  */
  9 
 10 #include <linux/fs.h>
 11 #include <linux/ext2_fs.h>
 12 
 13 
 14 static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
 15 
 16 unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
 17 {
 18         unsigned int i;
 19         unsigned long sum = 0;
 20         
 21         if (!map) 
 22                 return (0);
 23         for (i = 0; i < numchars; i++)
 24                 sum += nibblemap[map->b_data[i] & 0xf] +
 25                         nibblemap[(map->b_data[i] >> 4) & 0xf];
 26         return (sum);
 27 }
 28
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