1/*
 2 *  linux/fs/ext3/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 "ext3.h"
11
12#ifdef EXT3FS_DEBUG
13
14static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
15
16unsigned long ext3_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
29#endif  /*  EXT3FS_DEBUG  */
30