-
Notifications
You must be signed in to change notification settings - Fork 23
/
fs_def.h
135 lines (104 loc) · 5.25 KB
/
fs_def.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
#ifndef __FS__DEF__H__
#define __FS__DEF__H__
#include "device_io.h"
#include <time.h>
#include <stdint.h>
#include <stdbool.h>
/* 这里面定义的函数接口，所有的文件系统应该要遵循此接口 */
typedef int64_t fs_off_t;
typedef int64_t fs_size_t;
#define FS_MAX_FILE_PATH 2048
#define FS_ERROR -1
#define FS_MAX_PATH
enum {
FS_SEEK_SET,
FS_SEEK_CUR,
FS_SEEK_END
};
#define FS_S_IFREG (2 >> 0)
#define FS_S_IFDIR (2 >> 1)
#define FS_S_IFLNK (2 >> 2)
struct fs_stat {
long st_ino;
int st_nlink; //连到该文件的硬连接数目，刚建立的文件值为1
int st_mode;
fs_off_t st_size; //文件字节数(文件大小)
unsigned long st_blksize; //块大小(文件系统的I/O 缓冲区大小)
unsigned long st_blocks; //块数
time_t st_atime; //最后一次访问时间
time_t st_mtime; //最后一次修改时间
time_t st_ctime; //最后一次改变时间(指属性)
};
/** 实现的某种特定的文件系统必须要先实现以下的接口 */
typedef void fs_filesystem_t;
typedef fs_filesystem_t* (fs_filesystem_new_f)(device_handle_t device);
typedef void fs_file_t;
typedef void fs_dir_t;
typedef fs_file_t* (fs_open_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef void (fs_close_f)(fs_file_t* file);
typedef int (fs_read_f)(fs_file_t* file, char* buf, int count);
typedef int (fs_write_f)(fs_file_t* file, const char* buf, int count);
typedef bool (fs_ftruncate_f)(fs_file_t* file, fs_off_t size);
typedef fs_off_t (fs_lseek_f)(fs_file_t* file, fs_off_t off, int where);
typedef bool (fs_mkdir_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_rmdir_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_link_f)(device_handle_t device, fs_filesystem_t* fs, const char* src_path, const char* new_path);
typedef bool (fs_unlink_f)(device_handle_t device, fs_filesystem_t* fs, const char* path);
typedef bool (fs_symlink_f)(device_handle_t device, fs_filesystem_t* fs, const char* src_path, const char* new_path);
typedef bool (fs_readlink_f)(device_handle_t device, fs_filesystem_t* fs, const char *path, char *buf, size_t size);
typedef bool (fs_stat_f)(device_handle_t device, fs_filesystem_t* fs, const char *path, struct fs_stat *buf);
typedef fs_dir_t* (fs_opendir_f)(device_handle_t device, fs_filesystem_t* fs, const char *path);
typedef bool (fs_readdir_f)(fs_dir_t* dir, char* name);
typedef bool (fs_closedir_f)(fs_dir_t* dir);
/* 文件系统本身操作 */
typedef bool (fs_format_f)(device_handle_t device, int sectors_per_block);
typedef fs_size_t (fs_filesystem_used_size_f)(fs_filesystem_t* fs);
typedef fs_size_t (fs_filesystem_total_size_f)(fs_filesystem_t* fs);
/* 类似虚表的一个东西 */
struct fs_operate_functions_s{
fs_filesystem_new_f* filesystem_new;
fs_open_f* open;
fs_close_f* close;
fs_read_f* read;
fs_write_f* write;
fs_ftruncate_f* ftruncate;
fs_lseek_f* lseek;
fs_mkdir_f* mkdir;
fs_rmdir_f* rmdir;
fs_link_f* link;
fs_unlink_f* unlink;
fs_symlink_f* symlink;
fs_readlink_f* readlink;
fs_stat_f* stat;
fs_opendir_f* opendir;
fs_readdir_f* readdir;
fs_closedir_f* closedir;
fs_format_f* format;
fs_filesystem_total_size_f* filesystem_total_size;
fs_filesystem_used_size_f* filesystem_used_size;
};
#define FS_OPERATE_FUNCTIONS_SET(var, type_name) \
do { \
(var).open = (fs_open_f*)type_name##_open; \
(var).close = (fs_close_f*)type_name##_close; \
(var).read = (fs_read_f*)type_name##_read; \
(var).write = (fs_write_f*)type_name##_write; \
(var).ftruncate = (fs_ftruncate_f*)type_name##_ftruncate; \
(var).lseek = (fs_lseek_f*)type_name##_lseek; \
(var).mkdir = (fs_mkdir_f*)type_name##_mkdir; \
(var).rmdir = (fs_rmdir_f*)type_name##_rmdir; \
(var).link = (fs_link_f*)type_name##_link; \
(var).unlink = (fs_unlink_f*)type_name##_unlink; \
(var).symlink = (fs_symlink_f*)type_name##_symlink; \
(var).readlink = (fs_readlink_f*)type_name##_readlink; \
(var).stat = (fs_stat_f*)type_name##_stat; \
(var).opendir = (fs_opendir_f*)type_name##_opendir; \
(var).readdir = (fs_readdir_f*)type_name##_readdir; \
(var).closedir = (fs_closedir_f*)type_name##_closedir; \
(var).filesystem_new = (fs_filesystem_new_f*)type_name##_filesystem_new; \
(var).format = (fs_format_f*)type_name##_format; \
(var).filesystem_total_size = (fs_filesystem_total_size_f*)type_name##_filesystem_total_size; \
(var).filesystem_used_size = (fs_filesystem_used_size_f*)type_name##_filesystem_used_size; \
\
} while(0); \
#endif /* __FS__DEF__H__ */