ext4_utils.h revision 4605b3fb8a00fa37f617a8d0fe3a095d0503a845
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#ifdef __cplusplus 21extern "C" { 22#endif 23 24#ifndef _GNU_SOURCE 25#define _GNU_SOURCE 26#endif 27#define _FILE_OFFSET_BITS 64 28#define _LARGEFILE64_SOURCE 29#include <sys/types.h> 30#include <unistd.h> 31 32#include <sys/types.h> 33#include <errno.h> 34#include <stdarg.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <string.h> 38#include <setjmp.h> 39 40#if defined(__APPLE__) && defined(__MACH__) 41#define lseek64 lseek 42#define ftruncate64 ftruncate 43#define mmap64 mmap 44#define off64_t off_t 45#endif 46 47#ifdef __BIONIC__ 48extern void* __mmap2(void *, size_t, int, int, int, off_t); 49static inline void *mmap64(void *addr, size_t length, int prot, int flags, 50 int fd, off64_t offset) 51{ 52 return __mmap2(addr, length, prot, flags, fd, offset >> 12); 53} 54#endif 55 56extern int force; 57 58#define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0) 59#define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0) 60#define error_errno(s, args...) error(s ": %s", ##args, strerror(errno)) 61#define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0) 62#define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno)) 63 64#define EXT4_SUPER_MAGIC 0xEF53 65#define EXT4_JNL_BACKUP_BLOCKS 1 66 67#ifndef min /* already defined by windows.h */ 68#define min(a, b) ((a) < (b) ? (a) : (b)) 69#endif 70 71#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y)) 72#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y))) 73 74#define __le64 u64 75#define __le32 u32 76#define __le16 u16 77 78#define __be64 u64 79#define __be32 u32 80#define __be16 u16 81 82#define __u64 u64 83#define __u32 u32 84#define __u16 u16 85#define __u8 u8 86 87typedef unsigned long long u64; 88typedef signed long long s64; 89typedef unsigned int u32; 90typedef unsigned short int u16; 91typedef unsigned char u8; 92 93struct block_group_info; 94 95struct ext2_group_desc { 96 __le32 bg_block_bitmap; 97 __le32 bg_inode_bitmap; 98 __le32 bg_inode_table; 99 __le16 bg_free_blocks_count; 100 __le16 bg_free_inodes_count; 101 __le16 bg_used_dirs_count; 102 __le16 bg_pad; 103 __le32 bg_reserved[3]; 104}; 105 106struct fs_info { 107 s64 len; /* If set to 0, ask the block device for the size, 108 * if less than 0, reserve that much space at the 109 * end of the partition, else use the size given. */ 110 u32 block_size; 111 u32 blocks_per_group; 112 u32 inodes_per_group; 113 u32 inode_size; 114 u32 inodes; 115 u32 journal_blocks; 116 u16 feat_ro_compat; 117 u16 feat_compat; 118 u16 feat_incompat; 119 u32 bg_desc_reserve_blocks; 120 const char *label; 121 u8 no_journal; 122}; 123 124struct fs_aux_info { 125 struct ext4_super_block *sb; 126 struct ext4_super_block **backup_sb; 127 struct ext2_group_desc *bg_desc; 128 struct block_group_info *bgs; 129 u32 first_data_block; 130 u64 len_blocks; 131 u32 inode_table_blocks; 132 u32 groups; 133 u32 bg_desc_blocks; 134 u32 default_i_flags; 135 u32 blocks_per_ind; 136 u32 blocks_per_dind; 137 u32 blocks_per_tind; 138}; 139 140extern struct fs_info info; 141extern struct fs_aux_info aux_info; 142 143extern jmp_buf setjmp_env; 144 145static inline int log_2(int j) 146{ 147 int i; 148 149 for (i = 0; j > 0; i++) 150 j >>= 1; 151 152 return i - 1; 153} 154 155int ext4_bg_has_super_block(int bg); 156void write_ext4_image(const char *filename, int gz, int sparse, int crc, 157 int wipe); 158void ext4_create_fs_aux_info(void); 159void ext4_free_fs_aux_info(void); 160void ext4_fill_in_sb(void); 161void ext4_create_resize_inode(void); 162void ext4_create_journal_inode(void); 163void ext4_update_free(void); 164void ext4_queue_sb(void); 165u64 get_file_size(const char *filename); 166u64 parse_num(const char *arg); 167void ext4_parse_sb(struct ext4_super_block *sb); 168 169#ifdef __cplusplus 170} 171#endif 172 173#endif 174