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 #include <stdint.h> 40 41 #if defined(__APPLE__) && defined(__MACH__) 42 #define lseek64 lseek 43 #define ftruncate64 ftruncate 44 #define mmap64 mmap 45 #define off64_t off_t 46 #endif 47 48 #ifdef __BIONIC__ 49 extern void* __mmap2(void *, size_t, int, int, int, off_t); 50 static inline void *mmap64(void *addr, size_t length, int prot, int flags, 51 int fd, off64_t offset) 52 { 53 return __mmap2(addr, length, prot, flags, fd, offset >> 12); 54 } 55 #endif 56 57 extern int force; 58 59 #define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0) 60 #define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0) 61 #define error_errno(s, args...) error(s ": %s", ##args, strerror(errno)) 62 #define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0) 63 #define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno)) 64 65 #define EXT4_SUPER_MAGIC 0xEF53 66 #define EXT4_JNL_BACKUP_BLOCKS 1 67 68 #ifndef min /* already defined by windows.h */ 69 #define min(a, b) ((a) < (b) ? (a) : (b)) 70 #endif 71 72 #define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y)) 73 #define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y))) 74 75 #define __le64 u64 76 #define __le32 u32 77 #define __le16 u16 78 79 #define __be64 u64 80 #define __be32 u32 81 #define __be16 u16 82 83 #define __u64 u64 84 #define __u32 u32 85 #define __u16 u16 86 #define __u8 u8 87 88 /* XXX */ 89 #define cpu_to_le32(x) (x) 90 #define cpu_to_le16(x) (x) 91 #define le32_to_cpu(x) (x) 92 #define le16_to_cpu(x) (x) 93 94 typedef unsigned long long u64; 95 typedef signed long long s64; 96 typedef unsigned int u32; 97 typedef unsigned short int u16; 98 typedef unsigned char u8; 99 100 struct block_group_info; 101 struct xattr_list_element; 102 103 struct ext2_group_desc { 104 __le32 bg_block_bitmap; 105 __le32 bg_inode_bitmap; 106 __le32 bg_inode_table; 107 __le16 bg_free_blocks_count; 108 __le16 bg_free_inodes_count; 109 __le16 bg_used_dirs_count; 110 __le16 bg_flags; 111 __le32 bg_reserved[2]; 112 __le16 bg_reserved16; 113 __le16 bg_checksum; 114 }; 115 116 struct fs_info { 117 s64 len; /* If set to 0, ask the block device for the size, 118 * if less than 0, reserve that much space at the 119 * end of the partition, else use the size given. */ 120 u32 block_size; 121 u32 blocks_per_group; 122 u32 inodes_per_group; 123 u32 inode_size; 124 u32 inodes; 125 u32 journal_blocks; 126 u16 feat_ro_compat; 127 u16 feat_compat; 128 u16 feat_incompat; 129 u32 bg_desc_reserve_blocks; 130 const char *label; 131 u8 no_journal; 132 133 struct sparse_file *sparse_file; 134 }; 135 136 struct fs_aux_info { 137 struct ext4_super_block *sb; 138 struct ext4_super_block **backup_sb; 139 struct ext2_group_desc *bg_desc; 140 struct block_group_info *bgs; 141 struct xattr_list_element *xattrs; 142 u32 first_data_block; 143 u64 len_blocks; 144 u32 inode_table_blocks; 145 u32 groups; 146 u32 bg_desc_blocks; 147 u32 default_i_flags; 148 u32 blocks_per_ind; 149 u32 blocks_per_dind; 150 u32 blocks_per_tind; 151 }; 152 153 extern struct fs_info info; 154 extern struct fs_aux_info aux_info; 155 156 extern jmp_buf setjmp_env; 157 158 static inline int log_2(int j) 159 { 160 int i; 161 162 for (i = 0; j > 0; i++) 163 j >>= 1; 164 165 return i - 1; 166 } 167 168 int ext4_bg_has_super_block(int bg); 169 void write_ext4_image(int fd, int gz, int sparse, int crc); 170 void ext4_create_fs_aux_info(void); 171 void ext4_free_fs_aux_info(void); 172 void ext4_fill_in_sb(void); 173 void ext4_create_resize_inode(void); 174 void ext4_create_journal_inode(void); 175 void ext4_update_free(void); 176 void ext4_queue_sb(void); 177 u64 get_block_device_size(int fd); 178 u64 get_file_size(int fd); 179 u64 parse_num(const char *arg); 180 void ext4_parse_sb(struct ext4_super_block *sb); 181 u16 ext4_crc16(u16 crc_in, const void *buf, int size); 182 183 typedef void (*fs_config_func_t)(const char *path, int dir, unsigned *uid, unsigned *gid, 184 unsigned *mode, uint64_t *capabilities); 185 186 struct selabel_handle; 187 188 int make_ext4fs_internal(int fd, const char *directory, 189 const char *mountpoint, fs_config_func_t fs_config_func, int gzip, 190 int sparse, int crc, int wipe, 191 struct selabel_handle *sehnd, int verbose); 192 193 #ifdef __cplusplus 194 } 195 #endif 196 197 #endif 198
