| /* | |
| * linux/fs/ext2/bitmap.c | |
| * | |
| * Copyright (C) 1992, 1993 Remy Card (card@masi.ibp.fr) | |
| */ | |
| #include <linux/sched.h> | |
| #include <linux/fs.h> | |
| #include <linux/ext2_fs.h> | |
| #ifdef EXT2FS_DEBUG | |
| static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0}; | |
| unsigned long ext2_count_free (struct buffer_head * map, unsigned numchars) | |
| { | |
| unsigned 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 |