You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
702 B
32 lines
702 B
/*
|
|
* 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 <linux/buffer_head.h>
|
|
#include <linux/jbd.h>
|
|
#include <linux/ext3_fs.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 */
|
|
|
|
|