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 <linux/buffer_head.h>
11#include <linux/jbd.h>
12#include <linux/ext3_fs.h>
13
14#ifdef EXT3FS_DEBUG
15
16static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
17
18unsigned long ext3_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  /*  EXT3FS_DEBUG  */
32