ext4_utils.h revision 757ace516d8e4350616b5fd10da0c982d3d5ec74
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef _EXT4_UTILS_H_ 18#define _EXT4_UTILS_H_ 19 20#define _GNU_SOURCE 21#define _FILE_OFFSET_BITS 64 22#define _LARGEFILE64_SOURCE 23#include <sys/types.h> 24#include <unistd.h> 25 26#include <sys/types.h> 27#include <errno.h> 28#include <stdarg.h> 29#include <stdio.h> 30#include <stdlib.h> 31#include <string.h> 32 33#if defined(__APPLE__) && defined(__MACH__) 34#define lseek64 lseek 35#define off64_t off_t 36#endif 37 38#ifdef __BIONIC__ 39extern void* __mmap2(void *, size_t, int, int, int, off_t); 40static inline void *mmap64(void *addr, size_t length, int prot, int flags, 41 int fd, off64_t offset) 42{ 43 return __mmap2(addr, length, prot, flags, fd, offset >> 12); 44} 45#endif 46 47extern int force; 48 49#define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0) 50#define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) exit(EXIT_FAILURE); } while (0) 51#define error_errno(s) error(s ": %s", strerror(errno)) 52#define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); exit(EXIT_FAILURE); } while (0) 53#define critical_error_errno(s) critical_error(s ": %s", strerror(errno)) 54 55#define EXT4_SUPER_MAGIC 0xEF53 56#define EXT4_JNL_BACKUP_BLOCKS 1 57 58#define min(a, b) ((a) < (b) ? (a) : (b)) 59 60#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y)) 61#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y))) 62 63#define __le64 u64 64#define __le32 u32 65#define __le16 u16 66 67#define __be64 u64 68#define __be32 u32 69#define __be16 u16 70 71#define __u64 u64 72#define __u32 u32 73#define __u16 u16 74#define __u8 u8 75 76typedef unsigned long long u64; 77typedef unsigned int u32; 78typedef unsigned short int u16; 79typedef unsigned char u8; 80 81struct block_group_info; 82 83struct ext2_group_desc { 84 __le32 bg_block_bitmap; 85 __le32 bg_inode_bitmap; 86 __le32 bg_inode_table; 87 __le16 bg_free_blocks_count; 88 __le16 bg_free_inodes_count; 89 __le16 bg_used_dirs_count; 90 __le16 bg_pad; 91 __le32 bg_reserved[3]; 92}; 93 94struct fs_info { 95 u64 len; 96 u32 block_size; 97 u32 blocks_per_group; 98 u32 inodes_per_group; 99 u32 inode_size; 100 u32 inodes; 101 u32 journal_blocks; 102 u16 feat_ro_compat; 103 u16 feat_compat; 104 u16 feat_incompat; 105 u32 bg_desc_reserve_blocks; 106 const char *label; 107 u8 no_journal; 108}; 109 110struct fs_aux_info { 111 struct ext4_super_block *sb; 112 struct ext2_group_desc *bg_desc; 113 struct block_group_info *bgs; 114 u32 first_data_block; 115 u64 len_blocks; 116 u32 inode_table_blocks; 117 u32 groups; 118 u32 bg_desc_blocks; 119 u32 default_i_flags; 120 u32 blocks_per_ind; 121 u32 blocks_per_dind; 122 u32 blocks_per_tind; 123}; 124 125extern struct fs_info info; 126extern struct fs_aux_info aux_info; 127 128static inline int log_2(int j) 129{ 130 int i; 131 132 for (i = 0; j > 0; i++) 133 j >>= 1; 134 135 return i - 1; 136} 137 138int ext4_bg_has_super_block(int bg); 139void write_ext4_image(const char *filename, int gz, int sparse, int crc); 140void ext4_create_fs_aux_info(void); 141void ext4_free_fs_aux_info(void); 142void ext4_fill_in_sb(void); 143void ext4_create_resize_inode(void); 144void ext4_create_journal_inode(void); 145void ext4_update_free(void); 146void ext4_queue_sb(void); 147u64 get_file_size(const char *filename); 148u64 parse_num(const char *arg); 149 150#endif 151