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 #define _GNU_SOURCE
21 #define _FILE_OFFSET_BITS 64
22 #define _LARGEFILE64_SOURCE
23 #include <sys/types.h>
24 #include <unistd.h>
25
26 #include <sys/types.h>
27 #include <errno.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <setjmp.h>
33
34 #if defined(__APPLE__) && defined(__MACH__)
35 #define lseek64 lseek
36 #define ftruncate64 ftruncate
37 #define mmap64 mmap
38 #define off64_t off_t
39 #endif
40
41 #ifdef __BIONIC__
42 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)43 static inline void *mmap64(void *addr, size_t length, int prot, int flags,
44 int fd, off64_t offset)
45 {
46 return __mmap2(addr, length, prot, flags, fd, offset >> 12);
47 }
48 #endif
49
50 extern 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_SUPER_MAGIC 0xEF53
59 #define EXT4_JNL_BACKUP_BLOCKS 1
60
61 #define min(a, b) ((a) < (b) ? (a) : (b))
62
63 #define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
64 #define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
65
66 #define __le64 u64
67 #define __le32 u32
68 #define __le16 u16
69
70 #define __be64 u64
71 #define __be32 u32
72 #define __be16 u16
73
74 #define __u64 u64
75 #define __u32 u32
76 #define __u16 u16
77 #define __u8 u8
78
79 typedef unsigned long long u64;
80 typedef signed long long s64;
81 typedef unsigned int u32;
82 typedef unsigned short int u16;
83 typedef unsigned char u8;
84
85 struct block_group_info;
86
87 struct ext2_group_desc {
88 __le32 bg_block_bitmap;
89 __le32 bg_inode_bitmap;
90 __le32 bg_inode_table;
91 __le16 bg_free_blocks_count;
92 __le16 bg_free_inodes_count;
93 __le16 bg_used_dirs_count;
94 __le16 bg_pad;
95 __le32 bg_reserved[3];
96 };
97
98 struct fs_info {
99 s64 len; /* If set to 0, ask the block device for the size,
100 * if less than 0, reserve that much space at the
101 * end of the partition, else use the size given. */
102 u32 block_size;
103 u32 blocks_per_group;
104 u32 inodes_per_group;
105 u32 inode_size;
106 u32 inodes;
107 u32 journal_blocks;
108 u16 feat_ro_compat;
109 u16 feat_compat;
110 u16 feat_incompat;
111 u32 bg_desc_reserve_blocks;
112 const char *label;
113 u8 no_journal;
114 };
115
116 struct fs_aux_info {
117 struct ext4_super_block *sb;
118 struct ext4_super_block **backup_sb;
119 struct ext2_group_desc *bg_desc;
120 struct block_group_info *bgs;
121 u32 first_data_block;
122 u64 len_blocks;
123 u32 inode_table_blocks;
124 u32 groups;
125 u32 bg_desc_blocks;
126 u32 default_i_flags;
127 u32 blocks_per_ind;
128 u32 blocks_per_dind;
129 u32 blocks_per_tind;
130 };
131
132 extern struct fs_info info;
133 extern struct fs_aux_info aux_info;
134
135 extern jmp_buf setjmp_env;
136
log_2(int j)137 static inline int log_2(int j)
138 {
139 int i;
140
141 for (i = 0; j > 0; i++)
142 j >>= 1;
143
144 return i - 1;
145 }
146
147 int ext4_bg_has_super_block(int bg);
148 void write_ext4_image(const char *filename, int gz, int sparse, int crc,
149 int wipe);
150 void ext4_create_fs_aux_info(void);
151 void ext4_free_fs_aux_info(void);
152 void ext4_fill_in_sb(void);
153 void ext4_create_resize_inode(void);
154 void ext4_create_journal_inode(void);
155 void ext4_update_free(void);
156 void ext4_queue_sb(void);
157 u64 get_file_size(const char *filename);
158 u64 parse_num(const char *arg);
159 void ext4_parse_sb(struct ext4_super_block *sb);
160
161 #endif
162