ext4_utils.h revision 93eb1dc9e68d2e9dea94f56d8bce478c1a52b354
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
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__
48extern void*  __mmap2(void *, size_t, int, int, int, off_t);
49static 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
56extern 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#define min(a, b) ((a) < (b) ? (a) : (b))
68
69#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
70#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
71
72#define __le64 u64
73#define __le32 u32
74#define __le16 u16
75
76#define __be64 u64
77#define __be32 u32
78#define __be16 u16
79
80#define __u64 u64
81#define __u32 u32
82#define __u16 u16
83#define __u8 u8
84
85typedef unsigned long long u64;
86typedef signed long long s64;
87typedef unsigned int u32;
88typedef unsigned short int u16;
89typedef unsigned char u8;
90
91struct block_group_info;
92
93struct ext2_group_desc {
94	__le32 bg_block_bitmap;
95	__le32 bg_inode_bitmap;
96	__le32 bg_inode_table;
97	__le16 bg_free_blocks_count;
98	__le16 bg_free_inodes_count;
99	__le16 bg_used_dirs_count;
100	__le16 bg_pad;
101	__le32 bg_reserved[3];
102};
103
104struct fs_info {
105	s64 len;	/* If set to 0, ask the block device for the size,
106			 * if less than 0, reserve that much space at the
107			 * end of the partition, else use the size given. */
108	u32 block_size;
109	u32 blocks_per_group;
110	u32 inodes_per_group;
111	u32 inode_size;
112	u32 inodes;
113	u32 journal_blocks;
114	u16 feat_ro_compat;
115	u16 feat_compat;
116	u16 feat_incompat;
117	u32 bg_desc_reserve_blocks;
118	const char *label;
119	u8 no_journal;
120};
121
122struct fs_aux_info {
123	struct ext4_super_block *sb;
124	struct ext4_super_block **backup_sb;
125	struct ext2_group_desc *bg_desc;
126	struct block_group_info *bgs;
127	u32 first_data_block;
128	u64 len_blocks;
129	u32 inode_table_blocks;
130	u32 groups;
131	u32 bg_desc_blocks;
132	u32 default_i_flags;
133	u32 blocks_per_ind;
134	u32 blocks_per_dind;
135	u32 blocks_per_tind;
136};
137
138extern struct fs_info info;
139extern struct fs_aux_info aux_info;
140
141extern jmp_buf setjmp_env;
142
143static inline int log_2(int j)
144{
145	int i;
146
147	for (i = 0; j > 0; i++)
148		j >>= 1;
149
150	return i - 1;
151}
152
153int ext4_bg_has_super_block(int bg);
154void write_ext4_image(int fd, int gz, int sparse, int crc,
155		int wipe);
156void ext4_create_fs_aux_info(void);
157void ext4_free_fs_aux_info(void);
158void ext4_fill_in_sb(void);
159void ext4_create_resize_inode(void);
160void ext4_create_journal_inode(void);
161void ext4_update_free(void);
162void ext4_queue_sb(void);
163u64 get_file_size(int fd);
164u64 parse_num(const char *arg);
165void ext4_parse_sb(struct ext4_super_block *sb);
166
167#ifdef __cplusplus
168}
169#endif
170
171#endif
172