projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| ac27a0ec | 1 | /* |
| 617ba13b | 2 | * linux/fs/ext4/bitmap.c |
| ac27a0ec DK |
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> | |
| dab291af | 11 | #include <linux/jbd2.h> |
| 617ba13b | 12 | #include <linux/ext4_fs.h> |
| ac27a0ec | 13 | |
| 617ba13b | 14 | #ifdef EXT4FS_DEBUG |
| ac27a0ec | 15 | |
| febfcf91 | 16 | static const int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0}; |
| ac27a0ec | 17 | |
| 617ba13b | 18 | unsigned long ext4_count_free (struct buffer_head * map, unsigned int numchars) |
| ac27a0ec DK |
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 | } | |
| 30 | ||
| 617ba13b | 31 | #endif /* EXT4FS_DEBUG */ |
| ac27a0ec | 32 |