]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - fs/ext3/bitmap.c
Merge branch 'sh-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / fs / ext3 / bitmap.c
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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>
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11#include <linux/jbd.h>
12#include <linux/ext3_fs.h>
3af13763 13
c1f5a194 14#ifdef EXT3FS_DEBUG
1da177e4 15
febfcf91 16static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
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17
18unsigned long ext3_count_free (struct buffer_head * map, unsigned int numchars)
19{
20 unsigned int i;
21 unsigned long sum = 0;
22
ae6ddcc5 23 if (!map)
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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}
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30
31#endif /* EXT3FS_DEBUG */
32