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 21 extern "C" { 22 #endif 23 24 #ifndef _GNU_SOURCE 25 #define _GNU_SOURCE 26 #endif 27 #define _FILE_OFFSET_BITS 64 28 #define _LARGEFILE64_SOURCE 1 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__ 48 extern void* __mmap2(void *, size_t, int, int, int, off_t); 49 static 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 56 extern 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 87 typedef unsigned long long u64; 88 typedef signed long long s64; 89 typedef unsigned int u32; 90 typedef unsigned short int u16; 91 typedef unsigned char u8; 92 93 struct block_group_info; 94 95 struct 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 }; 105 106 struct 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 struct sparse_file *sparse_file; 124 }; 125 126 struct fs_aux_info { 127 struct ext4_super_block *sb; 128 struct ext4_super_block **backup_sb; 129 struct ext2_group_desc *bg_desc; 130 struct block_group_info *bgs; 131 u32 first_data_block; 132 u64 len_blocks; 133 u32 inode_table_blocks; 134 u32 groups; 135 u32 bg_desc_blocks; 136 u32 default_i_flags; 137 u32 blocks_per_ind; 138 u32 blocks_per_dind; 139 u32 blocks_per_tind; 140 }; 141 142 extern struct fs_info info; 143 extern struct fs_aux_info aux_info; 144 145 extern jmp_buf setjmp_env; 146 147 static inline int log_2(int j) 148 { 149 int i; 150 151 for (i = 0; j > 0; i++) 152 j >>= 1; 153 154 return i - 1; 155 } 156 157 int ext4_bg_has_super_block(int bg); 158 void write_ext4_image(int fd, int gz, int sparse, int crc); 159 void ext4_create_fs_aux_info(void); 160 void ext4_free_fs_aux_info(void); 161 void ext4_fill_in_sb(void); 162 void ext4_create_resize_inode(void); 163 void ext4_create_journal_inode(void); 164 void ext4_update_free(void); 165 void ext4_queue_sb(void); 166 u64 get_file_size(int fd); 167 u64 parse_num(const char *arg); 168 void ext4_parse_sb(struct ext4_super_block *sb); 169 170 #ifdef __cplusplus 171 } 172 #endif 173 174 #endif 175
