ext4_utils.h revision b6346d2e2ede70a986068f9bcff93fabdce7bd75 
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 __cplusplus
61#ifndef min /* already defined by windows.h */
62#define min(a, b) ((a) < (b) ? (a) : (b))
63#endif
64#endif
65
66#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
67#define EXT4_ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
68
69/* XXX */
70#define cpu_to_le32(x) (x)
71#define cpu_to_le16(x) (x)
72#define le32_to_cpu(x) (x)
73#define le16_to_cpu(x) (x)
74
75#ifdef __LP64__
76typedef unsigned long u64;
77typedef signed long s64;
78
79#define PRIext4u64 "lu"
80#else
81typedef unsigned long long u64;
82typedef signed long long s64;
83
84#define PRIext4u64 PRIu64
85#endif
86typedef unsigned int u32;
87typedef unsigned short int u16;
88typedef unsigned char u8;
89
90struct block_group_info;
91struct xattr_list_element;
92
93struct ext2_group_desc {
94	u32 bg_block_bitmap;
95	u32 bg_inode_bitmap;
96	u32 bg_inode_table;
97	u16 bg_free_blocks_count;
98	u16 bg_free_inodes_count;
99	u16 bg_used_dirs_count;
100	u16 bg_flags;
101	u32 bg_reserved[2];
102	u16 bg_reserved16;
103	u16 bg_checksum;
104};
105
106struct fs_aux_info {
107	struct ext4_super_block *sb;
108	struct ext4_super_block *sb_block;
109	struct ext4_super_block *sb_zero;
110	struct ext4_super_block **backup_sb;
111	struct ext2_group_desc *bg_desc;
112	struct block_group_info *bgs;
113	struct xattr_list_element *xattrs;
114	u32 first_data_block;
115	u64 len_blocks;
116	u32 inode_table_blocks;
117	u32 groups;
118	u32 bg_desc_blocks;
119	u32 default_i_flags;
120	u32 blocks_per_ind;
121	u32 blocks_per_dind;
122	u32 blocks_per_tind;
123};
124
125extern struct fs_info info;
126extern struct fs_aux_info aux_info;
127extern struct sparse_file *ext4_sparse_file;
128extern struct block_allocation *base_fs_allocations;
129
130extern jmp_buf setjmp_env;
131
132static inline int log_2(int j)
133{
134	int i;
135
136	for (i = 0; j > 0; i++)
137		j >>= 1;
138
139	return i - 1;
140}
141
142int bitmap_get_bit(u8 *bitmap, u32 bit);
143void bitmap_clear_bit(u8 *bitmap, u32 bit);
144int ext4_bg_has_super_block(int bg);
145void read_sb(int fd, struct ext4_super_block *sb);
146void write_sb(int fd, unsigned long long offset, struct ext4_super_block *sb);
147void write_ext4_image(int fd, int gz, int sparse, int crc);
148void ext4_create_fs_aux_info(void);
149void ext4_free_fs_aux_info(void);
150void ext4_fill_in_sb(int real_uuid);
151void ext4_create_resize_inode(void);
152void ext4_create_journal_inode(void);
153void ext4_update_free(void);
154void ext4_queue_sb(u64 start_block, struct ext4_super_block *sb);
155u64 get_block_device_size(int fd);
156int is_block_device_fd(int fd);
157u64 get_file_size(int fd);
158u64 parse_num(const char *arg);
159void ext4_parse_sb_info(struct ext4_super_block *sb);
160u16 ext4_crc16(u16 crc_in, const void *buf, int size);
161
162typedef void (*fs_config_func_t)(const char *path, int dir, const char *target_out_path,
163        unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities);
164
165struct selabel_handle;
166
167int make_ext4fs_internal(int fd, const char *directory, const char *_target_out_directory,
168						 const char *mountpoint, fs_config_func_t fs_config_func, int gzip,
169						 int sparse, int crc, int wipe, int real_uuid,
170						 struct selabel_handle *sehnd, int verbose, time_t fixed_time,
171						 FILE* block_list_file, FILE* base_alloc_file_in, FILE* base_alloc_file_out);
172
173int read_ext(int fd, int verbose);
174
175#ifdef __cplusplus
176}
177#endif
178
179#endif
180