]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
c1f5a194 KT |
11 | #include <linux/jbd.h> |
12 | #include <linux/ext3_fs.h> | |
3af13763 | 13 | |
c1f5a194 | 14 | #ifdef EXT3FS_DEBUG |
1da177e4 LT |
15 | |
16 | static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0}; | |
17 | ||
18 | unsigned 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 | } | |
3af13763 AB |
30 | |
31 | #endif /* EXT3FS_DEBUG */ | |
32 |