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1 | /* |
2 | * linux/fs/ext4/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/jbd2.h> |
12 | #include "ext4.h" |
13 | |
14 | #ifdef EXT4FS_DEBUG |
15 | |
16 | static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0}; |
17 | |
18 | unsigned int ext4_count_free(struct buffer_head *map, unsigned int numchars) |
19 | { |
20 | unsigned int i, sum = 0; |
21 | |
22 | if (!map) |
23 | return 0; |
24 | for (i = 0; i < numchars; i++) |
25 | sum += nibblemap[map->b_data[i] & 0xf] + |
26 | nibblemap[(map->b_data[i] >> 4) & 0xf]; |
27 | return sum; |
28 | } |
29 | |
30 | #endif /* EXT4FS_DEBUG */ |
31 | |
32 |
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