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
|
#pragma once
#include <stdbool.h>
#include <malloc.h>
#include <fs.h> // common header
// How to use :
// - when using a filesystem : never call the operations in fs_*_ops_t directly, use
// the functions defined bellow
// - when programming a filesystem : don't worry about allocating the fs_handle_t and fs_t,
// it is done automatically
// Structure defining a handle to an open file
typedef struct {
size_t (*read)(void* f, size_t offset, size_t len, char* buf);
size_t (*write)(void* f, size_t offset, size_t len, const char* buf);
bool (*stat)(void* f, stat_t *st);
void (*close)(void* f);
} fs_handle_ops_t;
typedef struct fs_handle {
struct fs *fs;
int refs;
fs_handle_ops_t *ops;
void* data;
int mode;
} fs_handle_t;
// Structure defining a filesystem
typedef struct {
bool (*open)(void *fs, const char* file, int mode, fs_handle_t *s);
bool (*delete)(void *fs, const char* file);
bool (*rename)(void *fs, const char* from, const char* to);
bool (*stat)(void *fs, const char* file, stat_t *st);
int (*ioctl)(void *fs, const char* file, int command, void* data);
bool (*add_source)(void* fs, fs_handle_t* source);
void (*shutdown)(void *fs);
} fs_ops_t;
typedef struct fs {
int refs;
fs_ops_t *ops;
void* data;
} fs_t;
// Structure defining a filesystem driver
typedef struct {
bool (*make)(fs_handle_t *source, char* opts, fs_t *d);
bool (*detect)(fs_handle_t *source);
} fs_driver_ops_t;
// Common functions
void register_fs_driver(const char* name, fs_driver_ops_t *ops);
fs_t* make_fs(const char* driver, fs_handle_t *source, char* opts);
bool fs_add_source(fs_t *fs, fs_handle_t *source);
void ref_fs(fs_t *fs);
void unref_fs(fs_t *fs);
bool fs_delete(fs_t *fs, const char* file);
bool fs_rename(fs_t *fs, const char* from, const char* to);
bool fs_stat(fs_t *fs, const char* file, stat_t *st);
int fs_ioctl(fs_t *fs, const char* file, int command, void* data);
fs_handle_t* fs_open(fs_t *fs, const char* file, int mode);
void ref_file(fs_handle_t *file);
void unref_file(fs_handle_t *file);
size_t file_read(fs_handle_t *f, size_t offset, size_t len, char* buf);
size_t file_write(fs_handle_t *f, size_t offset, size_t len, const char* buf);
int file_get_mode(fs_handle_t *f);
/* vim: set ts=4 sw=4 tw=0 noet :*/
|
