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