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Linux Cross Reference
Linux-2.6.17/fs/ext2/bitmap.c

Version: ~ [ 2.6.16 ] ~ [ 2.6.17 ] ~
Architecture: ~ [ ia64 ] ~ [ i386 ] ~ [ arm ] ~ [ ppc ] ~ [ 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 #ifdef EXT2FS_DEBUG
 11 
 12 #include <linux/buffer_head.h>
 13 
 14 #include "ext2.h"
 15 
 16 static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
 17 
 18 unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
 19 {
 20         unsigned int i;
 21         unsigned long sum = 0;
 22         
 23         if (!map) 
 24                 return (0);
 25         for (i = 0; i < numchars; i++)
 26                 sum += nibblemap[map->b_data[i] & 0xf] +
 27                         nibblemap[(map->b_data[i] >> 4) & 0xf];
 28         return (sum);
 29 }
 30 
 31 #endif  /*  EXT2FS_DEBUG  */
 32 
 33
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