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      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
     21 extern "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__
     49 extern void*  __mmap2(void *, size_t, int, int, int, off_t);
     50 static 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 
     57 extern 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 
     94 typedef unsigned long long u64;
     95 typedef signed long long s64;
     96 typedef unsigned int u32;
     97 typedef unsigned short int u16;
     98 typedef unsigned char u8;
     99 
    100 struct block_group_info;
    101 struct xattr_list_element;
    102 
    103 struct 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 
    116 struct 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 
    136 struct 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 
    153 extern struct fs_info info;
    154 extern struct fs_aux_info aux_info;
    155 
    156 extern jmp_buf setjmp_env;
    157 
    158 static 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 
    168 int ext4_bg_has_super_block(int bg);
    169 void write_ext4_image(int fd, int gz, int sparse, int crc);
    170 void ext4_create_fs_aux_info(void);
    171 void ext4_free_fs_aux_info(void);
    172 void ext4_fill_in_sb(void);
    173 void ext4_create_resize_inode(void);
    174 void ext4_create_journal_inode(void);
    175 void ext4_update_free(void);
    176 void ext4_queue_sb(void);
    177 u64 get_block_device_size(int fd);
    178 u64 get_file_size(int fd);
    179 u64 parse_num(const char *arg);
    180 void ext4_parse_sb(struct ext4_super_block *sb);
    181 u16 ext4_crc16(u16 crc_in, const void *buf, int size);
    182 
    183 typedef void (*fs_config_func_t)(const char *path, int dir, unsigned *uid, unsigned *gid,
    184         unsigned *mode, uint64_t *capabilities);
    185 
    186 struct selabel_handle;
    187 
    188 int 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