linux/fs/ext3/bitmap.c
Al Viro 4613ad180d ext3: move headers to fs/ext3/
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-03-31 16:03:16 -04:00

31 lines
639 B
C

/*
* linux/fs/ext3/bitmap.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*/
#include "ext3.h"
#ifdef EXT3FS_DEBUG
static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
unsigned long ext3_count_free (struct buffer_head * map, unsigned int numchars)
{
unsigned int i;
unsigned long sum = 0;
if (!map)
return (0);
for (i = 0; i < numchars; i++)
sum += nibblemap[map->b_data[i] & 0xf] +
nibblemap[(map->b_data[i] >> 4) & 0xf];
return (sum);
}
#endif /* EXT3FS_DEBUG */