ext4_utils.h revision 2ae7663e1e064000356ee9e49ebd08bdddc545f9
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__
42extern void*  __mmap2(void *, size_t, int, int, int, off_t);
43static 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
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_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
79typedef unsigned long long u64;
80typedef signed long long s64;
81typedef unsigned int u32;
82typedef unsigned short int u16;
83typedef unsigned char u8;
84
85struct block_group_info;
86
87struct 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
98struct 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
116struct fs_aux_info {
117	struct ext4_super_block *sb;
118	struct ext2_group_desc *bg_desc;
119	struct block_group_info *bgs;
120	u32 first_data_block;
121	u64 len_blocks;
122	u32 inode_table_blocks;
123	u32 groups;
124	u32 bg_desc_blocks;
125	u32 default_i_flags;
126	u32 blocks_per_ind;
127	u32 blocks_per_dind;
128	u32 blocks_per_tind;
129};
130
131extern struct fs_info info;
132extern struct fs_aux_info aux_info;
133
134extern jmp_buf setjmp_env;
135
136static inline int log_2(int j)
137{
138	int i;
139
140	for (i = 0; j > 0; i++)
141		j >>= 1;
142
143	return i - 1;
144}
145
146int ext4_bg_has_super_block(int bg);
147void write_ext4_image(const char *filename, int gz, int sparse, int crc,
148		int wipe);
149void ext4_create_fs_aux_info(void);
150void ext4_free_fs_aux_info(void);
151void ext4_fill_in_sb(void);
152void ext4_create_resize_inode(void);
153void ext4_create_journal_inode(void);
154void ext4_update_free(void);
155void ext4_queue_sb(void);
156u64 get_file_size(const char *filename);
157u64 parse_num(const char *arg);
158void ext4_parse_sb(struct ext4_super_block *sb);
159
160#endif
161