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/*
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/*
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 * Copyright (c) 2008 Jakub Jermar
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
7
 * are met:
8
 *
8
 *
9
 * - Redistributions of source code must retain the above copyright
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
12
 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
15
 *   derived from this software without specific prior written permission.
16
 *
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * 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 <libadt/list.h>
38
#include <futex.h>
38
#include <futex.h>
39
#include <rwlock.h>
39
#include <rwlock.h>
40
#include <sys/types.h>
40
#include <sys/types.h>
41
#include <bool.h>
41
#include <bool.h>
42
 
42
 
43
// FIXME: according to CONFIG_DEBUG
43
// FIXME: according to CONFIG_DEBUG
44
// #define dprintf(...) printf(__VA_ARGS__)
44
// #define dprintf(...) printf(__VA_ARGS__)
45
 
45
 
46
#define dprintf(...)
46
#define dprintf(...)
47
 
47
 
48
#define VFS_FIRST   IPC_FIRST_USER_METHOD
48
#define VFS_FIRST   IPC_FIRST_USER_METHOD
49
 
49
 
50
/* Basic types. */
50
/* Basic types. */
51
typedef int16_t fs_handle_t;
51
typedef int16_t fs_handle_t;
52
typedef int16_t dev_handle_t;
52
typedef int16_t dev_handle_t;
53
typedef uint32_t fs_index_t;
53
typedef uint32_t fs_index_t;
54
 
54
 
55
typedef enum {
55
typedef enum {
56
    VFS_READ = VFS_FIRST,
56
    VFS_READ = VFS_FIRST,
57
    VFS_WRITE,
57
    VFS_WRITE,
58
    VFS_TRUNCATE,
58
    VFS_TRUNCATE,
59
    VFS_MOUNT,
59
    VFS_MOUNT,
60
    VFS_UNMOUNT,
60
    VFS_UNMOUNT,
61
    VFS_LAST_CMN,   /* keep this the last member of this enum */
61
    VFS_LAST_CMN,   /* keep this the last member of this enum */
62
} vfs_request_cmn_t;
62
} vfs_request_cmn_t;
63
 
63
 
64
typedef enum {
64
typedef enum {
65
    VFS_LOOKUP = VFS_LAST_CMN,
65
    VFS_LOOKUP = VFS_LAST_CMN,
66
    VFS_MOUNTED,
66
    VFS_MOUNTED,
67
    VFS_DESTROY,
67
    VFS_DESTROY,
68
    VFS_LAST_CLNT,  /* keep this the last member of this enum */
68
    VFS_LAST_CLNT,  /* keep this the last member of this enum */
69
} vfs_request_clnt_t;
69
} vfs_request_clnt_t;
70
 
70
 
71
typedef enum {
71
typedef enum {
72
    VFS_REGISTER = VFS_LAST_CMN,
72
    VFS_REGISTER = VFS_LAST_CMN,
73
    VFS_OPEN,
73
    VFS_OPEN,
74
    VFS_CLOSE,
74
    VFS_CLOSE,
75
    VFS_SEEK,
75
    VFS_SEEK,
76
    VFS_MKDIR,
76
    VFS_MKDIR,
77
    VFS_UNLINK,
77
    VFS_UNLINK,
78
    VFS_RENAME,
78
    VFS_RENAME,
79
    VFS_LAST_SRV,   /* keep this the last member of this enum */
79
    VFS_LAST_SRV,   /* keep this the last member of this enum */
80
} vfs_request_srv_t;
80
} vfs_request_srv_t;
81
 
81
 
82
#define FS_NAME_MAXLEN  20
82
#define FS_NAME_MAXLEN  20
83
 
83
 
84
/**
84
/**
85
 * A structure like this is passed to VFS by each individual FS upon its
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
86
 * registration. It assosiates a human-readable identifier with each
87
 * registered FS.
87
 * registered FS.
88
 */
88
 */
89
typedef struct {
89
typedef struct {
90
    /** Unique identifier of the fs. */
90
    /** Unique identifier of the fs. */
91
    char name[FS_NAME_MAXLEN + 1];
91
    char name[FS_NAME_MAXLEN + 1];
92
} vfs_info_t;
92
} vfs_info_t;
93
 
93
 
94
/**
94
/**
95
 * A structure like this will be allocated for each registered file system.
95
 * A structure like this will be allocated for each registered file system.
96
 */
96
 */
97
typedef struct {
97
typedef struct {
98
    link_t fs_link;
98
    link_t fs_link;
99
    vfs_info_t vfs_info;
99
    vfs_info_t vfs_info;
100
    fs_handle_t fs_handle;
100
    fs_handle_t fs_handle;
101
    futex_t phone_futex;    /**< Phone serializing futex. */
101
    futex_t phone_futex;    /**< Phone serializing futex. */
102
    ipcarg_t phone;
102
    ipcarg_t phone;
103
} fs_info_t;
103
} fs_info_t;
104
 
104
 
105
/**
105
/**
106
 * VFS_PAIR uniquely represents a file system instance.
106
 * VFS_PAIR uniquely represents a file system instance.
107
 */
107
 */
108
#define VFS_PAIR        \
108
#define VFS_PAIR        \
109
    fs_handle_t fs_handle;  \
109
    fs_handle_t fs_handle;  \
110
    dev_handle_t dev_handle;
110
    dev_handle_t dev_handle;
111
 
111
 
112
/**
112
/**
113
 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
113
 * 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.
114
 * doesn't contain any state. For a stateful structure, see vfs_node_t.
115
 *
115
 *
116
 * @note    fs_handle, dev_handle and index are meant to be returned in one
116
 * @note    fs_handle, dev_handle and index are meant to be returned in one
117
 *      IPC reply.
117
 *      IPC reply.
118
 */
118
 */
119
#define VFS_TRIPLET \
119
#define VFS_TRIPLET \
120
    VFS_PAIR;   \
120
    VFS_PAIR;   \
121
    fs_index_t index;
121
    fs_index_t index;
122
 
122
 
123
typedef struct {
123
typedef struct {
124
    VFS_PAIR;
124
    VFS_PAIR;
125
} vfs_pair_t;
125
} vfs_pair_t;
126
 
126
 
127
typedef struct {
127
typedef struct {
128
    VFS_TRIPLET;
128
    VFS_TRIPLET;
129
} vfs_triplet_t;
129
} vfs_triplet_t;
130
 
130
 
131
/*
131
/*
132
 * Lookup flags.
132
 * Lookup flags.
133
 */
133
 */
134
/**
134
/**
135
 * No lookup flags used.
135
 * No lookup flags used.
136
 */
136
 */
137
#define L_NONE      0
137
#define L_NONE      0
138
/**
138
/**
139
 * Lookup will succeed only if the object is a regular file.  If L_CREATE is
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
140
 * specified, an empty file will be created. This flag is mutually exclusive
141
 * with L_DIRECTORY.
141
 * with L_DIRECTORY.
142
 */
142
 */
143
#define L_FILE      1
143
#define L_FILE      1
144
/**
144
/**
145
 * Lookup wil succeed only if the object is a directory. If L_CREATE is
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
146
 * specified, an empty directory will be created. This flag is mutually
147
 * exclusive with L_FILE.
147
 * exclusive with L_FILE.
148
 */
148
 */
149
#define L_DIRECTORY 2
149
#define L_DIRECTORY 2
150
/**
150
/**
151
 * When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the
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.
152
 * object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used.
153
 */
153
 */
154
#define L_EXCLUSIVE 4
154
#define L_EXCLUSIVE 4
155
/**
155
/**
156
 * L_CREATE is used for creating both regular files and directories.
156
 * L_CREATE is used for creating both regular files and directories.
157
 */
157
 */
158
#define L_CREATE    8
158
#define L_CREATE    8
159
/**
159
/**
160
 * L_LINK is used for linking to an already existing nodes.
160
 * L_LINK is used for linking to an already existing nodes.
161
 */
161
 */
162
#define L_LINK      16
162
#define L_LINK      16
163
/**
163
/**
164
 * L_UNLINK is used to remove leaves from the file system namespace. This flag
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
165
 * cannot be passed directly by the client, but will be set by VFS during
166
 * VFS_UNLINK.
166
 * VFS_UNLINK.
167
 */
167
 */
168
#define L_UNLINK    32  
168
#define L_UNLINK    32  
169
/**
169
/**
170
 * L_PARENT performs a lookup but returns the triplet of the parent node.
170
 * L_PARENT performs a lookup but returns the triplet of the parent node.
171
 * This flag may not be combined with any other lookup flag.
171
 * This flag may not be combined with any other lookup flag.
172
 */
172
 */
173
#define L_PARENT    64  
173
#define L_PARENT    64  
174
 
174
 
175
typedef enum vfs_node_type {
175
typedef enum vfs_node_type {
176
    VFS_NODE_UNKNOWN,
176
    VFS_NODE_UNKNOWN,
177
    VFS_NODE_FILE,
177
    VFS_NODE_FILE,
178
    VFS_NODE_DIRECTORY,
178
    VFS_NODE_DIRECTORY,
179
} vfs_node_type_t;
179
} vfs_node_type_t;
180
 
180
 
181
typedef struct {
181
typedef struct {
182
    vfs_triplet_t triplet;
182
    vfs_triplet_t triplet;
183
    vfs_node_type_t type;
183
    vfs_node_type_t type;
184
    size_t size;
184
    size_t size;
185
    unsigned lnkcnt;
185
    unsigned lnkcnt;
186
} vfs_lookup_res_t;
186
} vfs_lookup_res_t;
187
 
187
 
188
/**
188
/**
189
 * Instances of this type represent an active, in-memory VFS node and any state
189
 * Instances of this type represent an active, in-memory VFS node and any state
190
 * which may be associated with it.
190
 * which may be associated with it.
191
 */
191
 */
192
typedef struct {
192
typedef struct {
193
    VFS_TRIPLET;        /**< Identity of the node. */
193
    VFS_TRIPLET;        /**< Identity of the node. */
194
 
194
 
195
    /**
195
    /**
196
     * Usage counter.  This includes, but is not limited to, all vfs_file_t
196
     * Usage counter.  This includes, but is not limited to, all vfs_file_t
197
     * structures that reference this node.
197
     * structures that reference this node.
198
     */
198
     */
199
    unsigned refcnt;
199
    unsigned refcnt;
200
   
200
   
201
    /** Number of names this node has in the file system namespace. */
201
    /** Number of names this node has in the file system namespace. */
202
    unsigned lnkcnt;
202
    unsigned lnkcnt;
203
 
203
 
204
    link_t nh_link;     /**< Node hash-table link. */
204
    link_t nh_link;     /**< Node hash-table link. */
205
 
205
 
206
    vfs_node_type_t type;   /**< Partial info about the node type. */
206
    vfs_node_type_t type;   /**< Partial info about the node type. */
207
 
207
 
208
    size_t size;        /**< Cached size if the node is a file. */
208
    size_t size;        /**< Cached size if the node is a file. */
209
 
209
 
210
    /**
210
    /**
211
     * Holding this rwlock prevents modifications of the node's contents.
211
     * Holding this rwlock prevents modifications of the node's contents.
212
     */
212
     */
213
    rwlock_t contents_rwlock;
213
    rwlock_t contents_rwlock;
214
} vfs_node_t;
214
} vfs_node_t;
215
 
215
 
216
/**
216
/**
217
 * Instances of this type represent an open file. If the file is opened by more
217
 * Instances of this type represent an open file. If the file is opened by more
218
 * than one task, there will be a separate structure allocated for each task.
218
 * than one task, there will be a separate structure allocated for each task.
219
 */
219
 */
220
typedef struct {
220
typedef struct {
221
    /** Serializes access to this open file. */
221
    /** Serializes access to this open file. */
222
    futex_t lock;
222
    futex_t lock;
223
 
223
 
224
    vfs_node_t *node;
224
    vfs_node_t *node;
225
   
225
   
226
    /** Number of file handles referencing this file. */
226
    /** Number of file handles referencing this file. */
227
    unsigned refcnt;
227
    unsigned refcnt;
228
 
228
 
229
    /** Append on write. */
229
    /** Append on write. */
230
    bool append;
230
    bool append;
231
 
231
 
232
    /** Current position in the file. */
232
    /** Current position in the file. */
233
    off_t pos;
233
    off_t pos;
234
} vfs_file_t;
234
} vfs_file_t;
235
 
235
 
236
extern futex_t nodes_futex;
236
extern futex_t nodes_futex;
237
 
237
 
238
extern link_t fs_head;      /**< List of registered file systems. */
238
extern link_t fs_head;      /**< List of registered file systems. */
239
 
239
 
240
extern vfs_pair_t rootfs;   /**< Root file system. */
240
extern vfs_pair_t rootfs;   /**< Root file system. */
241
 
241
 
242
#define MAX_PATH_LEN        (64 * 1024)
242
#define MAX_PATH_LEN        (64 * 1024)
243
 
243
 
244
#define PLB_SIZE        (2 * MAX_PATH_LEN)
244
#define PLB_SIZE        (2 * MAX_PATH_LEN)
245
 
245
 
246
/** Each instance of this type describes one path lookup in progress. */
246
/** Each instance of this type describes one path lookup in progress. */
247
typedef struct {
247
typedef struct {
248
    link_t  plb_link;   /**< Active PLB entries list link. */
248
    link_t  plb_link;   /**< Active PLB entries list link. */
249
    unsigned index;     /**< Index of the first character in PLB. */
249
    unsigned index;     /**< Index of the first character in PLB. */
250
    size_t len;     /**< Number of characters in this PLB entry. */
250
    size_t len;     /**< Number of characters in this PLB entry. */
251
} plb_entry_t;
251
} plb_entry_t;
252
 
252
 
253
extern futex_t plb_futex;   /**< Futex protecting plb and plb_head. */
253
extern futex_t plb_futex;   /**< Futex protecting plb and plb_head. */
254
extern uint8_t *plb;        /**< Path Lookup Buffer */
254
extern uint8_t *plb;        /**< Path Lookup Buffer */
255
extern link_t plb_head;     /**< List of active PLB entries. */
255
extern link_t plb_head;     /**< List of active PLB entries. */
256
 
256
 
-
 
257
#define MAX_MNTOPTS_LEN     256
-
 
258
 
257
/** Holding this rwlock prevents changes in file system namespace. */
259
/** Holding this rwlock prevents changes in file system namespace. */
258
extern rwlock_t namespace_rwlock;
260
extern rwlock_t namespace_rwlock;
259
 
261
 
260
extern int vfs_grab_phone(fs_handle_t);
262
extern int vfs_grab_phone(fs_handle_t);
261
extern void vfs_release_phone(int);
263
extern void vfs_release_phone(int);
262
 
264
 
263
extern fs_handle_t fs_name_to_handle(char *, bool);
265
extern fs_handle_t fs_name_to_handle(char *, bool);
264
 
266
 
265
extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *, vfs_pair_t *,
267
extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *, vfs_pair_t *,
266
    ...);
268
    ...);
267
 
269
 
268
extern bool vfs_nodes_init(void);
270
extern bool vfs_nodes_init(void);
269
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
271
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
270
extern void vfs_node_put(vfs_node_t *);
272
extern void vfs_node_put(vfs_node_t *);
271
 
273
 
272
#define MAX_OPEN_FILES  128
274
#define MAX_OPEN_FILES  128
273
 
275
 
274
extern bool vfs_files_init(void);
276
extern bool vfs_files_init(void);
275
extern vfs_file_t *vfs_file_get(int);
277
extern vfs_file_t *vfs_file_get(int);
276
extern int vfs_fd_alloc(void);
278
extern int vfs_fd_alloc(void);
277
extern int vfs_fd_free(int);
279
extern int vfs_fd_free(int);
278
 
280
 
279
extern void vfs_file_addref(vfs_file_t *);
281
extern void vfs_file_addref(vfs_file_t *);
280
extern void vfs_file_delref(vfs_file_t *);
282
extern void vfs_file_delref(vfs_file_t *);
281
 
283
 
282
extern void vfs_node_addref(vfs_node_t *);
284
extern void vfs_node_addref(vfs_node_t *);
283
extern void vfs_node_delref(vfs_node_t *);
285
extern void vfs_node_delref(vfs_node_t *);
284
 
286
 
285
extern void vfs_process_pending_mount(void);
287
extern void vfs_process_pending_mount(void);
286
extern void vfs_register(ipc_callid_t, ipc_call_t *);
288
extern void vfs_register(ipc_callid_t, ipc_call_t *);
287
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
289
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
288
extern void vfs_open(ipc_callid_t, ipc_call_t *);
290
extern void vfs_open(ipc_callid_t, ipc_call_t *);
289
extern void vfs_close(ipc_callid_t, ipc_call_t *);
291
extern void vfs_close(ipc_callid_t, ipc_call_t *);
290
extern void vfs_read(ipc_callid_t, ipc_call_t *);
292
extern void vfs_read(ipc_callid_t, ipc_call_t *);
291
extern void vfs_write(ipc_callid_t, ipc_call_t *);
293
extern void vfs_write(ipc_callid_t, ipc_call_t *);
292
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
294
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
293
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
295
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
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extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
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extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
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extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
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extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
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extern void vfs_rename(ipc_callid_t, ipc_call_t *);
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extern void vfs_rename(ipc_callid_t, ipc_call_t *);
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#endif
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#endif
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/**
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/**
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 * @}
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 * @}
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 */
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 */
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