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#ifdef __BIONIC__
49extern void*  __mmap2(void *, size_t, int, int, int, off_t);
50static inline void *mmap64(void *addr, size_t length, int prot, int flags,
51        int fd, off64_t offset)
52{
53    return __mmap2(addr, length, prot, flags, fd, offset >> 12);
54}
55#endif
56
57extern int force;
58
59#define warn(fmt, args...) do { fprintf(stderr, "warning: %s: " fmt "\n", __func__, ## args); } while (0)
60#define error(fmt, args...) do { fprintf(stderr, "error: %s: " fmt "\n", __func__, ## args); if (!force) longjmp(setjmp_env, EXIT_FAILURE); } while (0)
61#define error_errno(s, args...) error(s ": %s", ##args, strerror(errno))
62#define critical_error(fmt, args...) do { fprintf(stderr, "critical error: %s: " fmt "\n", __func__, ## args); longjmp(setjmp_env, EXIT_FAILURE); } while (0)
63#define critical_error_errno(s, args...) critical_error(s ": %s", ##args, strerror(errno))
64
65#define EXT4_SUPER_MAGIC 0xEF53
66#define EXT4_JNL_BACKUP_BLOCKS 1
67
68#ifndef min /* already defined by windows.h */
69#define min(a, b) ((a) < (b) ? (a) : (b))
70#endif
71
72#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
73#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))
74
75#define __le64 u64
76#define __le32 u32
77#define __le16 u16
78
79#define __be64 u64
80#define __be32 u32
81#define __be16 u16
82
83#define __u64 u64
84#define __u32 u32
85#define __u16 u16
86#define __u8 u8
87
88/* XXX */
89#define cpu_to_le32(x) (x)
90#define cpu_to_le16(x) (x)
91#define le32_to_cpu(x) (x)
92#define le16_to_cpu(x) (x)
93
94typedef unsigned long long u64;
95typedef signed long long s64;
96typedef unsigned int u32;
97typedef unsigned short int u16;
98typedef unsigned char u8;
99
100struct block_group_info;
101struct xattr_list_element;
102
103struct ext2_group_desc {
104	__le32 bg_block_bitmap;
105	__le32 bg_inode_bitmap;
106	__le32 bg_inode_table;
107	__le16 bg_free_blocks_count;
108	__le16 bg_free_inodes_count;
109	__le16 bg_used_dirs_count;
110	__le16 bg_flags;
111	__le32 bg_reserved[2];
112	__le16 bg_reserved16;
113	__le16 bg_checksum;
114};
115
116struct fs_info {
117	s64 len;	/* If set to 0, ask the block device for the size,
118			 * if less than 0, reserve that much space at the
119			 * end of the partition, else use the size given. */
120	u32 block_size;
121	u32 blocks_per_group;
122	u32 inodes_per_group;
123	u32 inode_size;
124	u32 inodes;
125	u32 journal_blocks;
126	u16 feat_ro_compat;
127	u16 feat_compat;
128	u16 feat_incompat;
129	u32 bg_desc_reserve_blocks;
130	const char *label;
131	u8 no_journal;
132
133	struct sparse_file *sparse_file;
134};
135
136struct fs_aux_info {
137	struct ext4_super_block *sb;
138	struct ext4_super_block **backup_sb;
139	struct ext2_group_desc *bg_desc;
140	struct block_group_info *bgs;
141	struct xattr_list_element *xattrs;
142	u32 first_data_block;
143	u64 len_blocks;
144	u32 inode_table_blocks;
145	u32 groups;
146	u32 bg_desc_blocks;
147	u32 default_i_flags;
148	u32 blocks_per_ind;
149	u32 blocks_per_dind;
150	u32 blocks_per_tind;
151};
152
153extern struct fs_info info;
154extern struct fs_aux_info aux_info;
155
156extern jmp_buf setjmp_env;
157
158static inline int log_2(int j)
159{
160	int i;
161
162	for (i = 0; j > 0; i++)
163		j >>= 1;
164
165	return i - 1;
166}
167
168int ext4_bg_has_super_block(int bg);
169void write_ext4_image(int fd, int gz, int sparse, int crc);
170void ext4_create_fs_aux_info(void);
171void ext4_free_fs_aux_info(void);
172void ext4_fill_in_sb(void);
173void ext4_create_resize_inode(void);
174void ext4_create_journal_inode(void);
175void ext4_update_free(void);
176void ext4_queue_sb(void);
177u64 get_block_device_size(int fd);
178u64 get_file_size(int fd);
179u64 parse_num(const char *arg);
180void ext4_parse_sb(struct ext4_super_block *sb);
181u16 ext4_crc16(u16 crc_in, const void *buf, int size);
182
183typedef void (*fs_config_func_t)(const char *path, int dir, unsigned *uid, unsigned *gid,
184        unsigned *mode, uint64_t *capabilities);
185
186struct selabel_handle;
187
188int make_ext4fs_internal(int fd, const char *directory,
189                         const char *mountpoint, fs_config_func_t fs_config_func, int gzip,
190                         int sparse, int crc, int wipe,
191                         struct selabel_handle *sehnd, int verbose);
192
193#ifdef __cplusplus
194}
195#endif
196
197#endif
198