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
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);
mmap64(void * addr,size_t length,int prot,int flags,int fd,off64_t offset)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
124 struct fs_aux_info {
125 struct ext4_super_block *sb;
126 struct ext4_super_block **backup_sb;
127 struct ext2_group_desc *bg_desc;
128 struct block_group_info *bgs;
129 u32 first_data_block;
130 u64 len_blocks;
131 u32 inode_table_blocks;
132 u32 groups;
133 u32 bg_desc_blocks;
134 u32 default_i_flags;
135 u32 blocks_per_ind;
136 u32 blocks_per_dind;
137 u32 blocks_per_tind;
138 };
139
140 extern struct fs_info info;
141 extern struct fs_aux_info aux_info;
142
143 extern jmp_buf setjmp_env;
144
log_2(int j)145 static inline int log_2(int j)
146 {
147 int i;
148
149 for (i = 0; j > 0; i++)
150 j >>= 1;
151
152 return i - 1;
153 }
154
155 int ext4_bg_has_super_block(int bg);
156 void write_ext4_image(int fd, int gz, int sparse, int crc,
157 int wipe);
158 void ext4_create_fs_aux_info(void);
159 void ext4_free_fs_aux_info(void);
160 void ext4_fill_in_sb(void);
161 void ext4_create_resize_inode(void);
162 void ext4_create_journal_inode(void);
163 void ext4_update_free(void);
164 void ext4_queue_sb(void);
165 u64 get_file_size(int fd);
166 u64 parse_num(const char *arg);
167 void ext4_parse_sb(struct ext4_super_block *sb);
168
169 #ifdef __cplusplus
170 }
171 #endif
172
173 #endif
174