ext4_utils.h revision e4b5ae8ab07e698b95f004c9226000b02f853abc
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#include <sys/types.h> 21#include <errno.h> 22#include <stdarg.h> 23#include <stdio.h> 24#include <stdlib.h> 25#include <string.h> 26 27extern int force; 28 29#define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0) 30#define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) exit(EXIT_FAILURE); } while (0) 31#define error_errno(s) error(s ": %s", strerror(errno)) 32#define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); exit(EXIT_FAILURE); } while (0) 33#define critical_error_errno(s) critical_error(s ": %s", strerror(errno)) 34 35#define EXT4_SUPER_MAGIC 0xEF53 36#define EXT4_JNL_BACKUP_BLOCKS 1 37 38#define min(a, b) ((a) < (b) ? (a) : (b)) 39 40#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y)) 41 42#define __le64 u64 43#define __le32 u32 44#define __le16 u16 45 46#define __be64 u64 47#define __be32 u32 48#define __be16 u16 49 50#define __u64 u64 51#define __u32 u32 52#define __u16 u16 53#define __u8 u8 54 55typedef unsigned long long u64; 56typedef unsigned int u32; 57typedef unsigned short int u16; 58typedef unsigned char u8; 59 60struct block_group_info; 61 62struct ext2_group_desc { 63 __le32 bg_block_bitmap; 64 __le32 bg_inode_bitmap; 65 __le32 bg_inode_table; 66 __le16 bg_free_blocks_count; 67 __le16 bg_free_inodes_count; 68 __le16 bg_used_dirs_count; 69 __le16 bg_pad; 70 __le32 bg_reserved[3]; 71}; 72 73struct fs_info { 74 u64 len; 75 u32 block_size; 76 u32 blocks_per_group; 77 u32 inodes_per_group; 78 u32 inode_size; 79 u32 inodes; 80 u32 journal_blocks; 81 u16 feat_ro_compat; 82 u16 feat_compat; 83 u16 feat_incompat; 84 const char *label; 85 u8 no_journal; 86}; 87 88struct fs_aux_info { 89 struct ext4_super_block *sb; 90 struct ext2_group_desc *bg_desc; 91 struct block_group_info *bgs; 92 u32 first_data_block; 93 u64 len_blocks; 94 u32 inode_table_blocks; 95 u32 groups; 96 u32 bg_desc_blocks; 97 u32 bg_desc_reserve_blocks; 98 u32 default_i_flags; 99 u32 blocks_per_ind; 100 u32 blocks_per_dind; 101 u32 blocks_per_tind; 102}; 103 104extern struct fs_info info; 105extern struct fs_aux_info aux_info; 106 107static inline int log_2(int j) 108{ 109 int i; 110 111 for (i = 0; j > 0; i++) 112 j >>= 1; 113 114 return i - 1; 115} 116 117int ext4_bg_has_super_block(int bg); 118void write_ext4_image(const char *filename, int gz); 119void ext4_create_fs_aux_info(void); 120void ext4_free_fs_aux_info(void); 121void ext4_fill_in_sb(void); 122void ext4_create_resize_inode(void); 123void ext4_create_journal_inode(void); 124void ext4_update_free(void); 125u64 get_file_size(const char *filename); 126u64 parse_num(const char *arg); 127 128#endif 129