ext4_utils.h

   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 <sys/sysmacros.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <stdarg.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <setjmp.h>
  38 #include <stdint.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 #include "ext4_sb.h"
  48
  49 extern int force;
  50
  51 #define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0)
  52 #define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0)
  53 #define error_errno(s, args...) error(s ": %s", ##args, strerror(errno))
  54 #define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0)
  55 #define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno))
  56
  57 #define EXT4_JNL_BACKUP_BLOCKS 1
  58
  59 #ifndef min /* already defined by windows.h */
  60 #define min(a, b) ((a) < (b) ? (a) : (b))
  61 #endif
  62
  63 #define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
  64 #define EXT4_ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
  65
  66 /* XXX */
  67 #define cpu_to_le32(x) (x)
  68 #define cpu_to_le16(x) (x)
  69 #define le32_to_cpu(x) (x)
  70 #define le16_to_cpu(x) (x)
  71
  72 #ifdef __LP64__
  73 typedef unsigned long u64;
  74 typedef signed long s64;
  75 #else
  76 typedef unsigned long long u64;
  77 typedef signed long long s64;
  78 #endif
  79 typedef unsigned int u32;
  80 typedef unsigned short int u16;
  81 typedef unsigned char u8;
  82
  83 struct block_group_info;
  84 struct xattr_list_element;
  85
  86 struct ext2_group_desc {
  87         u32 bg_block_bitmap;
  88         u32 bg_inode_bitmap;
  89         u32 bg_inode_table;
  90         u16 bg_free_blocks_count;
  91         u16 bg_free_inodes_count;
  92         u16 bg_used_dirs_count;
  93         u16 bg_flags;
  94         u32 bg_reserved[2];
  95         u16 bg_reserved16;
  96         u16 bg_checksum;
  97 };
  98
  99 struct fs_aux_info {
 100         struct ext4_super_block *sb;
 101         struct ext4_super_block **backup_sb;
 102         struct ext2_group_desc *bg_desc;
 103         struct block_group_info *bgs;
 104         struct xattr_list_element *xattrs;
 105         u32 first_data_block;
 106         u64 len_blocks;
 107         u32 inode_table_blocks;
 108         u32 groups;
 109         u32 bg_desc_blocks;
 110         u32 default_i_flags;
 111         u32 blocks_per_ind;
 112         u32 blocks_per_dind;
 113         u32 blocks_per_tind;
 114 };
 115
 116 extern struct fs_info info;
 117 extern struct fs_aux_info aux_info;
 118 extern struct sparse_file *ext4_sparse_file;
 119
 120 extern jmp_buf setjmp_env;
 121
 122 static inline int log_2(int j)
 123 {
 124         int i;
 125
 126         for (i = 0; j > 0; i++)
 127                 j >>= 1;
 128
 129         return i - 1;
 130 }
 131
 132 int bitmap_get_bit(u8 *bitmap, u32 bit);
 133 void bitmap_clear_bit(u8 *bitmap, u32 bit);
 134 int ext4_bg_has_super_block(int bg);
 135 void read_sb(int fd, struct ext4_super_block *sb);
 136 void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb);
 137 void write_ext4_image(int fd, int gz, int sparse, int crc);
 138 void ext4_create_fs_aux_info(void);
 139 void ext4_free_fs_aux_info(void);
 140 void ext4_fill_in_sb(void);
 141 void ext4_create_resize_inode(void);
 142 void ext4_create_journal_inode(void);
 143 void ext4_update_free(void);
 144 void ext4_queue_sb(void);
 145 u64 get_block_device_size(int fd);
 146 int is_block_device_fd(int fd);
 147 u64 get_file_size(int fd);
 148 u64 parse_num(const char *arg);
 149 void ext4_parse_sb_info(struct ext4_super_block *sb);
 150 u16 ext4_crc16(u16 crc_in, const void *buf, int size);
 151
 152 typedef int (*fs_config_func_t)(const char *path, int dir, unsigned *uid, unsigned *gid,
 153                 unsigned *mode, uint64_t *capabilities);
 154
 155 struct selabel_handle;
 156
 157 int make_ext4fs_internal(int fd, const char *directory,
 158                                                  fs_config_func_t fs_config_func, int gzip,
 159                                                  int sparse, int crc, int wipe,
 160                                                  int verbose, time_t fixed_time,
 161                                                  FILE* block_list_file);
 162
 163 int read_ext(int fd, int verbose);
 164
 165 #ifdef __cplusplus
 166 }
 167 #endif
 168
 169 #endif