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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
27
 */
28
 
28
 
29
/** @addtogroup fs
29
/** @addtogroup fs
30
 * @{
30
 * @{
31
 */
31
 */
32
 
32
 
33
#ifndef VFS_VFS_H_
33
#ifndef VFS_VFS_H_
34
#define VFS_VFS_H_
34
#define VFS_VFS_H_
35
 
35
 
36
#include <ipc/ipc.h>
36
#include <ipc/ipc.h>
37
#include <libadt/list.h>
37
#include <adt/list.h>
38
#include <futex.h>
-
 
39
#include <rwlock.h>
38
#include <fibril_sync.h>
40
#include <sys/types.h>
39
#include <sys/types.h>
-
 
40
#include <devmap.h>
41
#include <bool.h>
41
#include <bool.h>
-
 
42
#include <ipc/vfs.h>
42
 
43
 
43
// FIXME: according to CONFIG_DEBUG
44
// FIXME: according to CONFIG_DEBUG
44
// #define dprintf(...) printf(__VA_ARGS__)
45
// #define dprintf(...)  printf(__VA_ARGS__)
45
 
46
 
46
#define dprintf(...)
47
#define dprintf(...)
47
 
48
 
48
#define VFS_FIRST   IPC_FIRST_USER_METHOD
-
 
49
 
-
 
50
/* Basic types. */
-
 
51
typedef int16_t fs_handle_t;
-
 
52
typedef int16_t dev_handle_t;
-
 
53
typedef uint32_t fs_index_t;
-
 
54
 
-
 
55
typedef enum {
-
 
56
    VFS_READ = VFS_FIRST,
-
 
57
    VFS_WRITE,
-
 
58
    VFS_TRUNCATE,
-
 
59
    VFS_MOUNT,
-
 
60
    VFS_UNMOUNT,
-
 
61
    VFS_LAST_CMN,   /* keep this the last member of this enum */
-
 
62
} vfs_request_cmn_t;
-
 
63
 
-
 
64
typedef enum {
-
 
65
    VFS_LOOKUP = VFS_LAST_CMN,
-
 
66
    VFS_MOUNTED,
-
 
67
    VFS_DESTROY,
-
 
68
    VFS_LAST_CLNT,  /* keep this the last member of this enum */
-
 
69
} vfs_request_clnt_t;
-
 
70
 
-
 
71
typedef enum {
-
 
72
    VFS_REGISTER = VFS_LAST_CMN,
-
 
73
    VFS_OPEN,
-
 
74
    VFS_CLOSE,
-
 
75
    VFS_SEEK,
-
 
76
    VFS_MKDIR,
-
 
77
    VFS_UNLINK,
-
 
78
    VFS_RENAME,
-
 
79
    VFS_LAST_SRV,   /* keep this the last member of this enum */
-
 
80
} vfs_request_srv_t;
-
 
81
 
-
 
82
#define FS_NAME_MAXLEN  20
-
 
83
 
-
 
84
/**
-
 
85
 * A structure like this is passed to VFS by each individual FS upon its
-
 
86
 * registration. It assosiates a human-readable identifier with each
-
 
87
 * registered FS.
-
 
88
 */
-
 
89
typedef struct {
-
 
90
    /** Unique identifier of the fs. */
-
 
91
    char name[FS_NAME_MAXLEN + 1];
-
 
92
} vfs_info_t;
-
 
93
 
-
 
94
/**
49
/**
95
 * A structure like this will be allocated for each registered file system.
50
 * A structure like this will be allocated for each registered file system.
96
 */
51
 */
97
typedef struct {
52
typedef struct {
98
    link_t fs_link;
53
    link_t fs_link;
99
    vfs_info_t vfs_info;
54
    vfs_info_t vfs_info;
100
    fs_handle_t fs_handle;
55
    fs_handle_t fs_handle;
101
    futex_t phone_futex;    /**< Phone serializing futex. */
56
    fibril_mutex_t phone_lock;
102
    ipcarg_t phone;
57
    ipcarg_t phone;
103
} fs_info_t;
58
} fs_info_t;
104
 
59
 
105
/**
60
/**
106
 * VFS_PAIR uniquely represents a file system instance.
61
 * VFS_PAIR uniquely represents a file system instance.
107
 */
62
 */
108
#define VFS_PAIR        \
63
#define VFS_PAIR \
109
    fs_handle_t fs_handle;  \
64
    fs_handle_t fs_handle; \
110
    dev_handle_t dev_handle;
65
    dev_handle_t dev_handle;
111
 
66
 
112
/**
67
/**
113
 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
68
 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
114
 * doesn't contain any state. For a stateful structure, see vfs_node_t.
69
 * doesn't contain any state. For a stateful structure, see vfs_node_t.
115
 *
70
 *
116
 * @note    fs_handle, dev_handle and index are meant to be returned in one
71
 * @note    fs_handle, dev_handle and index are meant to be returned in one
117
 *      IPC reply.
72
 *      IPC reply.
118
 */
73
 */
119
#define VFS_TRIPLET \
74
#define VFS_TRIPLET \
120
    VFS_PAIR;   \
75
    VFS_PAIR; \
121
    fs_index_t index;
76
    fs_index_t index;
122
 
77
 
123
typedef struct {
78
typedef struct {
124
    VFS_PAIR;
79
    VFS_PAIR;
125
} vfs_pair_t;
80
} vfs_pair_t;
126
 
81
 
127
typedef struct {
82
typedef struct {
128
    VFS_TRIPLET;
83
    VFS_TRIPLET;
129
} vfs_triplet_t;
84
} vfs_triplet_t;
130
 
85
 
131
/*
-
 
132
 * Lookup flags.
-
 
133
 */
-
 
134
/**
-
 
135
 * No lookup flags used.
-
 
136
 */
-
 
137
#define L_NONE      0
-
 
138
/**
-
 
139
 * Lookup will succeed only if the object is a regular file.  If L_CREATE is
-
 
140
 * specified, an empty file will be created. This flag is mutually exclusive
-
 
141
 * with L_DIRECTORY.
-
 
142
 */
-
 
143
#define L_FILE      1
-
 
144
/**
-
 
145
 * Lookup wil succeed only if the object is a directory. If L_CREATE is
-
 
146
 * specified, an empty directory will be created. This flag is mutually
-
 
147
 * exclusive with L_FILE.
-
 
148
 */
-
 
149
#define L_DIRECTORY 2
-
 
150
/**
-
 
151
 * When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the
-
 
152
 * object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used.
-
 
153
 */
-
 
154
#define L_EXCLUSIVE 4
-
 
155
/**
-
 
156
 * L_CREATE is used for creating both regular files and directories.
-
 
157
 */
-
 
158
#define L_CREATE    8
-
 
159
/**
-
 
160
 * L_LINK is used for linking to an already existing nodes.
-
 
161
 */
-
 
162
#define L_LINK      16
-
 
163
/**
-
 
164
 * L_UNLINK is used to remove leaves from the file system namespace. This flag
-
 
165
 * cannot be passed directly by the client, but will be set by VFS during
-
 
166
 * VFS_UNLINK.
-
 
167
 */
-
 
168
#define L_UNLINK    32  
-
 
169
 
-
 
170
typedef enum vfs_node_type {
86
typedef enum vfs_node_type {
171
    VFS_NODE_UNKNOWN,
87
    VFS_NODE_UNKNOWN,
172
    VFS_NODE_FILE,
88
    VFS_NODE_FILE,
173
    VFS_NODE_DIRECTORY,
89
    VFS_NODE_DIRECTORY,
174
} vfs_node_type_t;
90
} vfs_node_type_t;
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203
    size_t size;        /**< Cached size if the node is a file. */
119
    size_t size;        /**< Cached size if the node is a file. */
204
 
120
 
205
    /**
121
    /**
206
     * Holding this rwlock prevents modifications of the node's contents.
122
     * Holding this rwlock prevents modifications of the node's contents.
207
     */
123
     */
208
    rwlock_t contents_rwlock;
124
    fibril_rwlock_t contents_rwlock;
209
} vfs_node_t;
125
} vfs_node_t;
210
 
126
 
211
/**
127
/**
212
 * Instances of this type represent an open file. If the file is opened by more
128
 * Instances of this type represent an open file. If the file is opened by more
213
 * than one task, there will be a separate structure allocated for each task.
129
 * than one task, there will be a separate structure allocated for each task.
214
 */
130
 */
215
typedef struct {
131
typedef struct {
216
    /** Serializes access to this open file. */
132
    /** Serializes access to this open file. */
217
    futex_t lock;
133
    fibril_mutex_t lock;
218
 
134
 
219
    vfs_node_t *node;
135
    vfs_node_t *node;
220
   
136
   
221
    /** Number of file handles referencing this file. */
137
    /** Number of file handles referencing this file. */
222
    unsigned refcnt;
138
    unsigned refcnt;
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226
 
142
 
227
    /** Current position in the file. */
143
    /** Current position in the file. */
228
    off_t pos;
144
    off_t pos;
229
} vfs_file_t;
145
} vfs_file_t;
230
 
146
 
231
extern futex_t nodes_futex;
147
extern fibril_mutex_t nodes_mutex;
232
 
148
 
-
 
149
extern fibril_condvar_t fs_head_cv;
-
 
150
extern fibril_mutex_t fs_head_lock;
233
extern link_t fs_head;      /**< List of registered file systems. */
151
extern link_t fs_head;      /**< List of registered file systems. */
234
 
152
 
235
extern vfs_pair_t rootfs;   /**< Root file system. */
153
extern vfs_pair_t rootfs;   /**< Root file system. */
236
 
154
 
237
#define MAX_PATH_LEN        (64 * 1024)
-
 
238
 
-
 
239
#define PLB_SIZE        (2 * MAX_PATH_LEN)
-
 
240
 
-
 
241
/** Each instance of this type describes one path lookup in progress. */
155
/** Each instance of this type describes one path lookup in progress. */
242
typedef struct {
156
typedef struct {
243
    link_t  plb_link;   /**< Active PLB entries list link. */
157
    link_t  plb_link;   /**< Active PLB entries list link. */
244
    unsigned index;     /**< Index of the first character in PLB. */
158
    unsigned index;     /**< Index of the first character in PLB. */
245
    size_t len;     /**< Number of characters in this PLB entry. */
159
    size_t len;     /**< Number of characters in this PLB entry. */
246
} plb_entry_t;
160
} plb_entry_t;
247
 
161
 
248
extern futex_t plb_futex;   /**< Futex protecting plb and plb_head. */
162
extern fibril_mutex_t plb_mutex;/**< Mutex protecting plb and plb_head. */
249
extern uint8_t *plb;        /**< Path Lookup Buffer */
163
extern uint8_t *plb;        /**< Path Lookup Buffer */
250
extern link_t plb_head;     /**< List of active PLB entries. */
164
extern link_t plb_head;     /**< List of active PLB entries. */
251
 
165
 
252
#define MAX_MNTOPTS_LEN     256
166
#define MAX_MNTOPTS_LEN     256
253
 
167
 
254
/** Holding this rwlock prevents changes in file system namespace. */
168
/** Holding this rwlock prevents changes in file system namespace. */
255
extern rwlock_t namespace_rwlock;
169
extern fibril_rwlock_t namespace_rwlock;
256
 
170
 
257
extern int vfs_grab_phone(fs_handle_t);
171
extern int vfs_grab_phone(fs_handle_t);
258
extern void vfs_release_phone(int);
172
extern void vfs_release_phone(int);
259
 
173
 
260
extern fs_handle_t fs_name_to_handle(char *, bool);
174
extern fs_handle_t fs_name_to_handle(char *, bool);
261
 
175
 
262
extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *, vfs_pair_t *,
176
extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *,
263
    ...);
177
    vfs_pair_t *, ...);
-
 
178
extern int vfs_open_node_internal(vfs_lookup_res_t *);
264
 
179
 
265
extern bool vfs_nodes_init(void);
180
extern bool vfs_nodes_init(void);
266
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
181
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
267
extern void vfs_node_put(vfs_node_t *);
182
extern void vfs_node_put(vfs_node_t *);
268
 
183
 
Line 277... Line 192...
277
extern void vfs_file_delref(vfs_file_t *);
192
extern void vfs_file_delref(vfs_file_t *);
278
 
193
 
279
extern void vfs_node_addref(vfs_node_t *);
194
extern void vfs_node_addref(vfs_node_t *);
280
extern void vfs_node_delref(vfs_node_t *);
195
extern void vfs_node_delref(vfs_node_t *);
281
 
196
 
282
extern void vfs_process_pending_mount(void);
-
 
283
extern void vfs_register(ipc_callid_t, ipc_call_t *);
197
extern void vfs_register(ipc_callid_t, ipc_call_t *);
284
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
198
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
285
extern void vfs_open(ipc_callid_t, ipc_call_t *);
199
extern void vfs_open(ipc_callid_t, ipc_call_t *);
-
 
200
extern void vfs_open_node(ipc_callid_t, ipc_call_t *);
-
 
201
extern void vfs_sync(ipc_callid_t, ipc_call_t *);
286
extern void vfs_close(ipc_callid_t, ipc_call_t *);
202
extern void vfs_close(ipc_callid_t, ipc_call_t *);
287
extern void vfs_read(ipc_callid_t, ipc_call_t *);
203
extern void vfs_read(ipc_callid_t, ipc_call_t *);
288
extern void vfs_write(ipc_callid_t, ipc_call_t *);
204
extern void vfs_write(ipc_callid_t, ipc_call_t *);
289
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
205
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
290
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
206
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
-
 
207
extern void vfs_fstat(ipc_callid_t, ipc_call_t *);
-
 
208
extern void vfs_fstat(ipc_callid_t, ipc_call_t *);
-
 
209
extern void vfs_stat(ipc_callid_t, ipc_call_t *);
291
extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
210
extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
292
extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
211
extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
293
extern void vfs_rename(ipc_callid_t, ipc_call_t *);
212
extern void vfs_rename(ipc_callid_t, ipc_call_t *);
294
 
213
 
295
#endif
214
#endif