signal: Use task_is_*
[linux-2.6/mini2440.git] / fs / ext4 / bitmap.c
blob420554f8f79d8f4fb4a99a95bec9539e6c78f8bc
1 /*
2 * linux/fs/ext4/bitmap.c
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 */
10 #include <linux/buffer_head.h>
11 #include <linux/jbd2.h>
12 #include <linux/ext4_fs.h>
14 #ifdef EXT4FS_DEBUG
16 static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
18 unsigned long ext4_count_free (struct buffer_head * map, unsigned int numchars)
20 unsigned int i;
21 unsigned long sum = 0;
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);
31 #endif /* EXT4FS_DEBUG */