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1 | /* |
1 | /* |
2 | * Copyright (c) 2008 Jakub Jermar |
2 | * Copyright (c) 2008 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * 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 |
13 | * 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 |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * 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, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * 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 <atomic.h> |
38 | #include <atomic.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 | #define dprintf(...) printf(__VA_ARGS__) |
43 | #define dprintf(...) printf(__VA_ARGS__) |
44 | 44 | ||
45 | #define VFS_FIRST IPC_FIRST_USER_METHOD |
45 | #define VFS_FIRST IPC_FIRST_USER_METHOD |
46 | 46 | ||
47 | #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST) |
47 | #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST) |
48 | 48 | ||
49 | typedef enum { |
49 | typedef enum { |
50 | VFS_OPEN = VFS_FIRST, |
50 | VFS_OPEN = VFS_FIRST, |
51 | VFS_CLOSE, |
51 | VFS_CLOSE, |
52 | VFS_READ, |
52 | VFS_READ, |
53 | VFS_WRITE, |
53 | VFS_WRITE, |
54 | VFS_TRUNCATE, |
54 | VFS_TRUNCATE, |
55 | VFS_RENAME, |
55 | VFS_RENAME, |
56 | VFS_OPENDIR, |
56 | VFS_OPENDIR, |
57 | VFS_READDIR, |
57 | VFS_READDIR, |
58 | VFS_CLOSEDIR, |
58 | VFS_CLOSEDIR, |
59 | VFS_MKDIR, |
59 | VFS_MKDIR, |
60 | VFS_UNLINK, |
60 | VFS_UNLINK, |
61 | VFS_MOUNT, |
61 | VFS_MOUNT, |
62 | VFS_UNMOUNT, |
62 | VFS_UNMOUNT, |
63 | VFS_LAST_CMN, /* keep this the last member of this enum */ |
63 | VFS_LAST_CMN, /* keep this the last member of this enum */ |
64 | } vfs_request_cmn_t; |
64 | } vfs_request_cmn_t; |
65 | 65 | ||
66 | typedef enum { |
66 | typedef enum { |
67 | VFS_LOOKUP = VFS_LAST_CMN, |
67 | VFS_LOOKUP = VFS_LAST_CMN, |
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_SEEK, |
73 | VFS_SEEK, |
74 | VFS_LAST_SRV, /* keep this the last member of this enum */ |
74 | VFS_LAST_SRV, /* keep this the last member of this enum */ |
75 | } vfs_request_srv_t; |
75 | } vfs_request_srv_t; |
76 | 76 | ||
77 | 77 | ||
78 | /** |
78 | /** |
79 | * An instance of this structure is associated with a particular FS operation. |
79 | * An instance of this structure is associated with a particular FS operation. |
80 | * It tells VFS if the FS supports the operation or maybe if a default one |
80 | * It tells VFS if the FS supports the operation or maybe if a default one |
81 | * should be used. |
81 | * should be used. |
82 | */ |
82 | */ |
83 | typedef enum { |
83 | typedef enum { |
84 | VFS_OP_NULL = 0, |
84 | VFS_OP_NULL = 0, |
85 | VFS_OP_DEFAULT, |
85 | VFS_OP_DEFAULT, |
86 | VFS_OP_DEFINED |
86 | VFS_OP_DEFINED |
87 | } vfs_op_t; |
87 | } vfs_op_t; |
88 | 88 | ||
89 | #define FS_NAME_MAXLEN 20 |
89 | #define FS_NAME_MAXLEN 20 |
90 | 90 | ||
91 | /** |
91 | /** |
92 | * A structure like this is passed to VFS by each individual FS upon its |
92 | * A structure like this is passed to VFS by each individual FS upon its |
93 | * registration. It assosiates a human-readable identifier with each |
93 | * registration. It assosiates a human-readable identifier with each |
94 | * registered FS. More importantly, through this structure, the FS announces |
94 | * registered FS. More importantly, through this structure, the FS announces |
95 | * what operations it supports. |
95 | * what operations it supports. |
96 | */ |
96 | */ |
97 | typedef struct { |
97 | typedef struct { |
98 | /** Unique identifier of the fs. */ |
98 | /** Unique identifier of the fs. */ |
99 | char name[FS_NAME_MAXLEN + 1]; |
99 | char name[FS_NAME_MAXLEN + 1]; |
100 | 100 | ||
101 | /** Operations. */ |
101 | /** Operations. */ |
102 | vfs_op_t ops[VFS_LAST_CLNT - VFS_FIRST]; |
102 | vfs_op_t ops[VFS_LAST_CLNT - VFS_FIRST]; |
103 | } vfs_info_t; |
103 | } vfs_info_t; |
104 | 104 | ||
105 | /** |
105 | /** |
106 | * A structure like this will be allocated for each registered file system. |
106 | * A structure like this will be allocated for each registered file system. |
107 | */ |
107 | */ |
108 | typedef struct { |
108 | typedef struct { |
109 | link_t fs_link; |
109 | link_t fs_link; |
110 | vfs_info_t vfs_info; |
110 | vfs_info_t vfs_info; |
111 | int fs_handle; |
111 | int fs_handle; |
112 | atomic_t phone_futex; /**< Phone serializing futex. */ |
112 | atomic_t phone_futex; /**< Phone serializing futex. */ |
113 | ipcarg_t phone; |
113 | ipcarg_t phone; |
114 | } fs_info_t; |
114 | } fs_info_t; |
115 | 115 | ||
116 | /** |
116 | /** |
117 | * VFS_PAIR uniquely represents a file system instance. |
117 | * VFS_PAIR uniquely represents a file system instance. |
118 | */ |
118 | */ |
119 | #define VFS_PAIR \ |
119 | #define VFS_PAIR \ |
120 | int fs_handle; \ |
120 | int fs_handle; \ |
121 | int dev_handle; |
121 | int dev_handle; |
122 | 122 | ||
123 | /** |
123 | /** |
124 | * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but |
124 | * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but |
125 | * doesn't contain any state. For a stateful structure, see vfs_node_t. |
125 | * doesn't contain any state. For a stateful structure, see vfs_node_t. |
126 | * |
126 | * |
127 | * @note fs_handle, dev_handle and index are meant to be returned in one |
127 | * @note fs_handle, dev_handle and index are meant to be returned in one |
128 | * IPC reply. |
128 | * IPC reply. |
129 | */ |
129 | */ |
130 | #define VFS_TRIPLET \ |
130 | #define VFS_TRIPLET \ |
131 | VFS_PAIR; \ |
131 | VFS_PAIR; \ |
132 | uint64_t index; |
132 | uint64_t index; |
133 | 133 | ||
134 | typedef struct { |
134 | typedef struct { |
135 | VFS_PAIR; |
135 | VFS_PAIR; |
136 | } vfs_pair_t; |
136 | } vfs_pair_t; |
137 | 137 | ||
138 | typedef struct { |
138 | typedef struct { |
139 | VFS_TRIPLET; |
139 | VFS_TRIPLET; |
140 | } vfs_triplet_t; |
140 | } vfs_triplet_t; |
141 | 141 | ||
142 | /* |
142 | /* |
143 | * Lookup flags. |
143 | * Lookup flags. |
144 | */ |
144 | */ |
145 | /** |
145 | /** |
146 | * Lookup will succeed only if the object is a regular file. If L_CREATE is |
146 | * Lookup will succeed only if the object is a regular file. If L_CREATE is |
147 | * specified, an empty file will be created. This flag is mutually exclusive |
147 | * specified, an empty file will be created. This flag is mutually exclusive |
148 | * with L_DIRECTORY. |
148 | * with L_DIRECTORY. |
149 | */ |
149 | */ |
150 | #define L_FILE 1 |
150 | #define L_FILE 1 |
151 | /** |
151 | /** |
152 | * Lookup wil succeed only if the object is a directory. If L_CREATE is |
152 | * Lookup wil succeed only if the object is a directory. If L_CREATE is |
153 | * specified, an empty directory will be created. This flag is mutually |
153 | * specified, an empty directory will be created. This flag is mutually |
154 | * exclusive with L_FILE. |
154 | * exclusive with L_FILE. |
155 | */ |
155 | */ |
156 | #define L_DIRECTORY 2 |
156 | #define L_DIRECTORY 2 |
157 | /** |
157 | /** |
158 | * When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the |
158 | * When used with L_CREATE, L_EXCLUSIVE will cause the lookup to fail if the |
159 | * object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used. |
159 | * object already exists. L_EXCLUSIVE is implied when L_DIRECTORY is used. |
160 | */ |
160 | */ |
161 | #define L_EXCLUSIVE 4 |
161 | #define L_EXCLUSIVE 4 |
162 | /** |
162 | /** |
163 | * L_CREATE is used for creating both regular files and directories. |
163 | * L_CREATE is used for creating both regular files and directories. |
164 | */ |
164 | */ |
165 | #define L_CREATE 8 |
165 | #define L_CREATE 8 |
166 | /** |
166 | /** |
167 | * L_DESTROY is used to remove leaves from the file system namespace. This flag |
167 | * L_DESTROY is used to remove leaves from the file system namespace. This flag |
168 | * cannot be passed directly by the client, but will be set by VFS during |
168 | * cannot be passed directly by the client, but will be set by VFS during |
169 | * VFS_UNLINK. |
169 | * VFS_UNLINK. |
170 | */ |
170 | */ |
171 | #define L_DESTROY 16 |
171 | #define L_DESTROY 16 |
172 | 172 | ||
173 | typedef struct { |
173 | typedef struct { |
174 | vfs_triplet_t triplet; |
174 | vfs_triplet_t triplet; |
175 | size_t size; |
175 | size_t size; |
- | 176 | unsigned lnkcnt; |
|
176 | } vfs_lookup_res_t; |
177 | } vfs_lookup_res_t; |
177 | 178 | ||
178 | /** |
179 | /** |
179 | * Instances of this type represent an active, in-memory VFS node and any state |
180 | * Instances of this type represent an active, in-memory VFS node and any state |
180 | * which may be associated with it. |
181 | * which may be associated with it. |
181 | */ |
182 | */ |
182 | typedef struct { |
183 | typedef struct { |
183 | VFS_TRIPLET; /**< Identity of the node. */ |
184 | VFS_TRIPLET; /**< Identity of the node. */ |
- | 185 | ||
- | 186 | /** |
|
- | 187 | * Usage counter. This includes, but is not limited to, all vfs_file_t |
|
- | 188 | * structures that reference this node. |
|
- | 189 | */ |
|
184 | unsigned refcnt; /**< Usage counter. */ |
190 | unsigned refcnt; |
- | 191 | ||
- | 192 | /** Number of names this node has in the file system namespace. */ |
|
- | 193 | unsigned lnkcnt; |
|
- | 194 | ||
185 | link_t nh_link; /**< Node hash-table link. */ |
195 | link_t nh_link; /**< Node hash-table link. */ |
186 | size_t size; /**< Cached size of the file. */ |
196 | size_t size; /**< Cached size of the file. */ |
187 | 197 | ||
188 | /** |
198 | /** |
189 | * Holding this rwlock prevents modifications of the node's contents. |
199 | * Holding this rwlock prevents modifications of the node's contents. |
190 | */ |
200 | */ |
191 | rwlock_t contents_rwlock; |
201 | rwlock_t contents_rwlock; |
192 | } vfs_node_t; |
202 | } vfs_node_t; |
193 | 203 | ||
194 | /** |
204 | /** |
195 | * Instances of this type represent an open file. If the file is opened by more |
205 | * Instances of this type represent an open file. If the file is opened by more |
196 | * than one task, there will be a separate structure allocated for each task. |
206 | * than one task, there will be a separate structure allocated for each task. |
197 | */ |
207 | */ |
198 | typedef struct { |
208 | typedef struct { |
199 | /** Serializes access to this open file. */ |
209 | /** Serializes access to this open file. */ |
200 | futex_t lock; |
210 | futex_t lock; |
201 | 211 | ||
202 | vfs_node_t *node; |
212 | vfs_node_t *node; |
203 | 213 | ||
204 | /** Number of file handles referencing this file. */ |
214 | /** Number of file handles referencing this file. */ |
205 | unsigned refcnt; |
215 | unsigned refcnt; |
206 | 216 | ||
207 | /** Append on write. */ |
217 | /** Append on write. */ |
208 | bool append; |
218 | bool append; |
209 | 219 | ||
210 | /** Current position in the file. */ |
220 | /** Current position in the file. */ |
211 | off_t pos; |
221 | off_t pos; |
212 | } vfs_file_t; |
222 | } vfs_file_t; |
213 | 223 | ||
214 | extern link_t fs_head; /**< List of registered file systems. */ |
224 | extern link_t fs_head; /**< List of registered file systems. */ |
215 | 225 | ||
216 | extern vfs_triplet_t rootfs; /**< Root node of the root file system. */ |
226 | extern vfs_triplet_t rootfs; /**< Root node of the root file system. */ |
217 | 227 | ||
218 | #define MAX_PATH_LEN (64 * 1024) |
228 | #define MAX_PATH_LEN (64 * 1024) |
219 | 229 | ||
220 | #define PLB_SIZE (2 * MAX_PATH_LEN) |
230 | #define PLB_SIZE (2 * MAX_PATH_LEN) |
221 | 231 | ||
222 | /** Each instance of this type describes one path lookup in progress. */ |
232 | /** Each instance of this type describes one path lookup in progress. */ |
223 | typedef struct { |
233 | typedef struct { |
224 | link_t plb_link; /**< Active PLB entries list link. */ |
234 | link_t plb_link; /**< Active PLB entries list link. */ |
225 | unsigned index; /**< Index of the first character in PLB. */ |
235 | unsigned index; /**< Index of the first character in PLB. */ |
226 | size_t len; /**< Number of characters in this PLB entry. */ |
236 | size_t len; /**< Number of characters in this PLB entry. */ |
227 | } plb_entry_t; |
237 | } plb_entry_t; |
228 | 238 | ||
229 | extern atomic_t plb_futex; /**< Futex protecting plb and plb_head. */ |
239 | extern atomic_t plb_futex; /**< Futex protecting plb and plb_head. */ |
230 | extern uint8_t *plb; /**< Path Lookup Buffer */ |
240 | extern uint8_t *plb; /**< Path Lookup Buffer */ |
231 | extern link_t plb_head; /**< List of active PLB entries. */ |
241 | extern link_t plb_head; /**< List of active PLB entries. */ |
232 | 242 | ||
233 | /** Holding this rwlock prevents changes in file system namespace. */ |
243 | /** Holding this rwlock prevents changes in file system namespace. */ |
234 | extern rwlock_t namespace_rwlock; |
244 | extern rwlock_t namespace_rwlock; |
235 | 245 | ||
236 | extern int vfs_grab_phone(int); |
246 | extern int vfs_grab_phone(int); |
237 | extern void vfs_release_phone(int); |
247 | extern void vfs_release_phone(int); |
238 | 248 | ||
239 | extern int fs_name_to_handle(char *, bool); |
249 | extern int fs_name_to_handle(char *, bool); |
240 | 250 | ||
241 | extern int vfs_lookup_internal(char *, size_t, int, vfs_lookup_res_t *, |
251 | extern int vfs_lookup_internal(char *, size_t, int, vfs_lookup_res_t *, |
242 | vfs_pair_t *); |
252 | vfs_pair_t *); |
243 | 253 | ||
244 | extern bool vfs_nodes_init(void); |
254 | extern bool vfs_nodes_init(void); |
245 | extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *); |
255 | extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *); |
246 | extern void vfs_node_put(vfs_node_t *); |
256 | extern void vfs_node_put(vfs_node_t *); |
247 | 257 | ||
248 | #define MAX_OPEN_FILES 128 |
258 | #define MAX_OPEN_FILES 128 |
249 | 259 | ||
250 | extern bool vfs_files_init(void); |
260 | extern bool vfs_files_init(void); |
251 | extern vfs_file_t *vfs_file_get(int); |
261 | extern vfs_file_t *vfs_file_get(int); |
252 | extern int vfs_fd_alloc(void); |
262 | extern int vfs_fd_alloc(void); |
253 | extern void vfs_fd_free(int); |
263 | extern void vfs_fd_free(int); |
254 | 264 | ||
255 | extern void vfs_file_addref(vfs_file_t *); |
265 | extern void vfs_file_addref(vfs_file_t *); |
256 | extern void vfs_file_delref(vfs_file_t *); |
266 | extern void vfs_file_delref(vfs_file_t *); |
257 | 267 | ||
258 | extern void vfs_node_addref(vfs_node_t *); |
268 | extern void vfs_node_addref(vfs_node_t *); |
259 | extern void vfs_node_delref(vfs_node_t *); |
269 | extern void vfs_node_delref(vfs_node_t *); |
260 | 270 | ||
261 | extern void vfs_register(ipc_callid_t, ipc_call_t *); |
271 | extern void vfs_register(ipc_callid_t, ipc_call_t *); |
262 | extern void vfs_mount(ipc_callid_t, ipc_call_t *); |
272 | extern void vfs_mount(ipc_callid_t, ipc_call_t *); |
263 | extern void vfs_open(ipc_callid_t, ipc_call_t *); |
273 | extern void vfs_open(ipc_callid_t, ipc_call_t *); |
264 | extern void vfs_read(ipc_callid_t, ipc_call_t *); |
274 | extern void vfs_read(ipc_callid_t, ipc_call_t *); |
265 | extern void vfs_write(ipc_callid_t, ipc_call_t *); |
275 | extern void vfs_write(ipc_callid_t, ipc_call_t *); |
266 | extern void vfs_seek(ipc_callid_t, ipc_call_t *); |
276 | extern void vfs_seek(ipc_callid_t, ipc_call_t *); |
267 | extern void vfs_truncate(ipc_callid_t, ipc_call_t *); |
277 | extern void vfs_truncate(ipc_callid_t, ipc_call_t *); |
268 | extern void vfs_mkdir(ipc_callid_t, ipc_call_t *); |
278 | extern void vfs_mkdir(ipc_callid_t, ipc_call_t *); |
269 | 279 | ||
270 | #endif |
280 | #endif |
271 | 281 | ||
272 | /** |
282 | /** |
273 | * @} |
283 | * @} |
274 | */ |
284 | */ |
275 | 285 |