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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Jakub Jermar |
2 | * Copyright (c) 2007 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 | /** |
33 | /** |
34 | * @file vfs_register.c |
34 | * @file vfs_register.c |
35 | * @brief VFS_REGISTER method. |
35 | * @brief VFS_REGISTER method. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <ipc/ipc.h> |
38 | #include <ipc/ipc.h> |
39 | #include <ipc/services.h> |
39 | #include <ipc/services.h> |
40 | #include <async.h> |
40 | #include <async.h> |
41 | #include <fibril.h> |
41 | #include <fibril.h> |
42 | #include <errno.h> |
42 | #include <errno.h> |
43 | #include <stdio.h> |
43 | #include <stdio.h> |
44 | #include <stdlib.h> |
44 | #include <stdlib.h> |
45 | #include <string.h> |
45 | #include <string.h> |
46 | #include <ctype.h> |
46 | #include <ctype.h> |
47 | #include <bool.h> |
47 | #include <bool.h> |
48 | #include <futex.h> |
48 | #include <futex.h> |
49 | #include <as.h> |
49 | #include <as.h> |
50 | #include <libadt/list.h> |
50 | #include <libadt/list.h> |
51 | #include <assert.h> |
51 | #include <assert.h> |
52 | #include "vfs.h" |
52 | #include "vfs.h" |
53 | 53 | ||
54 | atomic_t fs_head_futex = FUTEX_INITIALIZER; |
54 | atomic_t fs_head_futex = FUTEX_INITIALIZER; |
55 | link_t fs_head; |
55 | link_t fs_head; |
56 | 56 | ||
57 | atomic_t fs_handle_next = { |
57 | atomic_t fs_handle_next = { |
58 | .count = 1 |
58 | .count = 1 |
59 | }; |
59 | }; |
60 | 60 | ||
61 | /** Verify the VFS info structure. |
61 | /** Verify the VFS info structure. |
62 | * |
62 | * |
63 | * @param info Info structure to be verified. |
63 | * @param info Info structure to be verified. |
64 | * |
64 | * |
65 | * @return Non-zero if the info structure is sane, zero otherwise. |
65 | * @return Non-zero if the info structure is sane, zero otherwise. |
66 | */ |
66 | */ |
67 | static bool vfs_info_sane(vfs_info_t *info) |
67 | static bool vfs_info_sane(vfs_info_t *info) |
68 | { |
68 | { |
69 | int i; |
69 | int i; |
70 | 70 | ||
71 | /* |
71 | /* |
72 | * Check if the name is non-empty and is composed solely of ASCII |
72 | * Check if the name is non-empty and is composed solely of ASCII |
73 | * characters [a-z]+[a-z0-9_-]*. |
73 | * characters [a-z]+[a-z0-9_-]*. |
74 | */ |
74 | */ |
75 | if (!islower(info->name[0])) { |
75 | if (!islower(info->name[0])) { |
76 | dprintf("The name doesn't start with a lowercase character.\n"); |
76 | dprintf("The name doesn't start with a lowercase character.\n"); |
77 | return false; |
77 | return false; |
78 | } |
78 | } |
79 | for (i = 1; i < FS_NAME_MAXLEN; i++) { |
79 | for (i = 1; i < FS_NAME_MAXLEN; i++) { |
80 | if (!(islower(info->name[i]) || isdigit(info->name[i])) && |
80 | if (!(islower(info->name[i]) || isdigit(info->name[i])) && |
81 | (info->name[i] != '-') && (info->name[i] != '_')) { |
81 | (info->name[i] != '-') && (info->name[i] != '_')) { |
82 | if (info->name[i] == '\0') { |
82 | if (info->name[i] == '\0') { |
83 | break; |
83 | break; |
84 | } else { |
84 | } else { |
85 | dprintf("The name contains illegal " |
85 | dprintf("The name contains illegal " |
86 | "characters.\n"); |
86 | "characters.\n"); |
87 | return false; |
87 | return false; |
88 | } |
88 | } |
89 | } |
89 | } |
90 | } |
90 | } |
91 | 91 | ||
92 | 92 | ||
93 | /* |
93 | /* |
94 | * Check if the FS implements mandatory VFS operations. |
94 | * Check if the FS implements mandatory VFS operations. |
95 | */ |
95 | */ |
96 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] != VFS_OP_DEFINED) { |
96 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] != VFS_OP_DEFINED) { |
97 | dprintf("Operation VFS_REGISTER not defined by the client.\n"); |
97 | dprintf("Operation VFS_REGISTER not defined by the client.\n"); |
98 | return false; |
98 | return false; |
99 | } |
99 | } |
100 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] != VFS_OP_DEFINED) { |
100 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] != VFS_OP_DEFINED) { |
101 | dprintf("Operation VFS_MOUNT not defined by the client.\n"); |
101 | dprintf("Operation VFS_MOUNT not defined by the client.\n"); |
102 | return false; |
102 | return false; |
103 | } |
103 | } |
104 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] != VFS_OP_DEFINED) { |
104 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] != VFS_OP_DEFINED) { |
105 | dprintf("Operation VFS_UNMOUNT not defined by the client.\n"); |
105 | dprintf("Operation VFS_UNMOUNT not defined by the client.\n"); |
106 | return false; |
106 | return false; |
107 | } |
107 | } |
108 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] != VFS_OP_DEFINED) { |
108 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] != VFS_OP_DEFINED) { |
109 | dprintf("Operation VFS_LOOKUP not defined by the client.\n"); |
109 | dprintf("Operation VFS_LOOKUP not defined by the client.\n"); |
110 | return false; |
110 | return false; |
111 | } |
111 | } |
112 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_OPEN)] != VFS_OP_DEFINED) { |
112 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_OPEN)] != VFS_OP_DEFINED) { |
113 | dprintf("Operation VFS_OPEN not defined by the client.\n"); |
113 | dprintf("Operation VFS_OPEN not defined by the client.\n"); |
114 | return false; |
114 | return false; |
115 | } |
115 | } |
116 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] != VFS_OP_DEFINED) { |
116 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] != VFS_OP_DEFINED) { |
117 | dprintf("Operation VFS_CLOSE not defined by the client.\n"); |
117 | dprintf("Operation VFS_CLOSE not defined by the client.\n"); |
118 | return false; |
118 | return false; |
119 | } |
119 | } |
120 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_READ)] != VFS_OP_DEFINED) { |
120 | if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_READ)] != VFS_OP_DEFINED) { |
121 | dprintf("Operation VFS_READ not defined by the client.\n"); |
121 | dprintf("Operation VFS_READ not defined by the client.\n"); |
122 | return false; |
122 | return false; |
123 | } |
123 | } |
124 | 124 | ||
125 | /* |
125 | /* |
126 | * Check if each operation is either not defined, defined or default. |
126 | * Check if each operation is either not defined, defined or default. |
127 | */ |
127 | */ |
128 | for (i = VFS_FIRST; i < VFS_LAST; i++) { |
128 | for (i = VFS_FIRST; i < VFS_LAST; i++) { |
129 | if ((info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_NULL) && |
129 | if ((info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_NULL) && |
130 | (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFAULT) && |
130 | (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFAULT) && |
131 | (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFINED)) { |
131 | (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFINED)) { |
132 | dprintf("Operation info not understood.\n"); |
132 | dprintf("Operation info not understood.\n"); |
133 | return false; |
133 | return false; |
134 | } |
134 | } |
135 | } |
135 | } |
136 | return true; |
136 | return true; |
137 | } |
137 | } |
138 | 138 | ||
139 | /** VFS_REGISTER protocol function. |
139 | /** VFS_REGISTER protocol function. |
140 | * |
140 | * |
141 | * @param rid Hash of the call with the request. |
141 | * @param rid Hash of the call with the request. |
142 | * @param request Call structure with the request. |
142 | * @param request Call structure with the request. |
143 | */ |
143 | */ |
144 | void vfs_register(ipc_callid_t rid, ipc_call_t *request) |
144 | void vfs_register(ipc_callid_t rid, ipc_call_t *request) |
145 | { |
145 | { |
146 | ipc_callid_t callid; |
146 | ipc_callid_t callid; |
147 | ipc_call_t call; |
147 | ipc_call_t call; |
148 | int rc; |
148 | int rc; |
149 | size_t size; |
149 | size_t size; |
150 | 150 | ||
151 | dprintf("Processing VFS_REGISTER request received from %p.\n", |
151 | dprintf("Processing VFS_REGISTER request received from %p.\n", |
152 | request->in_phone_hash); |
152 | request->in_phone_hash); |
153 | 153 | ||
154 | /* |
154 | /* |
155 | * The first call has to be IPC_M_DATA_SEND in which we receive the |
155 | * The first call has to be IPC_M_DATA_SEND in which we receive the |
156 | * VFS info structure from the client FS. |
156 | * VFS info structure from the client FS. |
157 | */ |
157 | */ |
158 | if (!ipc_data_receive(&callid, NULL, &size)) { |
158 | if (!ipc_data_receive(&callid, NULL, &size)) { |
159 | /* |
159 | /* |
160 | * The client doesn't obey the same protocol as we do. |
160 | * The client doesn't obey the same protocol as we do. |
161 | */ |
161 | */ |
162 | dprintf("Receiving of VFS info failed.\n"); |
162 | dprintf("Receiving of VFS info failed.\n"); |
163 | ipc_answer_0(callid, EINVAL); |
163 | ipc_answer_0(callid, EINVAL); |
164 | ipc_answer_0(rid, EINVAL); |
164 | ipc_answer_0(rid, EINVAL); |
165 | return; |
165 | return; |
166 | } |
166 | } |
167 | 167 | ||
168 | dprintf("VFS info received, size = %d\n", size); |
168 | dprintf("VFS info received, size = %d\n", size); |
169 | 169 | ||
170 | /* |
170 | /* |
171 | * We know the size of the VFS info structure. See if the client |
171 | * We know the size of the VFS info structure. See if the client |
172 | * understands this easy concept too. |
172 | * understands this easy concept too. |
173 | */ |
173 | */ |
174 | if (size != sizeof(vfs_info_t)) { |
174 | if (size != sizeof(vfs_info_t)) { |
175 | /* |
175 | /* |
176 | * The client is sending us something, which cannot be |
176 | * The client is sending us something, which cannot be |
177 | * the info structure. |
177 | * the info structure. |
178 | */ |
178 | */ |
179 | dprintf("Received VFS info has bad size.\n"); |
179 | dprintf("Received VFS info has bad size.\n"); |
180 | ipc_answer_0(callid, EINVAL); |
180 | ipc_answer_0(callid, EINVAL); |
181 | ipc_answer_0(rid, EINVAL); |
181 | ipc_answer_0(rid, EINVAL); |
182 | return; |
182 | return; |
183 | } |
183 | } |
184 | 184 | ||
185 | /* |
185 | /* |
186 | * Allocate and initialize a buffer for the fs_info structure. |
186 | * Allocate and initialize a buffer for the fs_info structure. |
187 | */ |
187 | */ |
188 | fs_info_t *fs_info; |
188 | fs_info_t *fs_info; |
189 | fs_info = (fs_info_t *) malloc(sizeof(fs_info_t)); |
189 | fs_info = (fs_info_t *) malloc(sizeof(fs_info_t)); |
190 | if (!fs_info) { |
190 | if (!fs_info) { |
191 | dprintf("Could not allocate memory for FS info.\n"); |
191 | dprintf("Could not allocate memory for FS info.\n"); |
192 | ipc_answer_0(callid, ENOMEM); |
192 | ipc_answer_0(callid, ENOMEM); |
193 | ipc_answer_0(rid, ENOMEM); |
193 | ipc_answer_0(rid, ENOMEM); |
194 | return; |
194 | return; |
195 | } |
195 | } |
196 | link_initialize(&fs_info->fs_link); |
196 | link_initialize(&fs_info->fs_link); |
197 | 197 | ||
198 | rc = ipc_data_deliver(callid, &fs_info->vfs_info, size); |
198 | rc = ipc_data_deliver(callid, &fs_info->vfs_info, size); |
199 | if (rc != EOK) { |
199 | if (rc != EOK) { |
200 | dprintf("Failed to deliver the VFS info into our AS, rc=%d.\n", |
200 | dprintf("Failed to deliver the VFS info into our AS, rc=%d.\n", |
201 | rc); |
201 | rc); |
202 | free(fs_info); |
202 | free(fs_info); |
203 | ipc_answer_0(callid, rc); |
203 | ipc_answer_0(callid, rc); |
204 | ipc_answer_0(rid, rc); |
204 | ipc_answer_0(rid, rc); |
205 | return; |
205 | return; |
206 | } |
206 | } |
207 | 207 | ||
208 | dprintf("VFS info delivered.\n"); |
208 | dprintf("VFS info delivered.\n"); |
209 | 209 | ||
210 | if (!vfs_info_sane(&fs_info->vfs_info)) { |
210 | if (!vfs_info_sane(&fs_info->vfs_info)) { |
211 | free(fs_info); |
211 | free(fs_info); |
212 | ipc_answer_0(callid, EINVAL); |
212 | ipc_answer_0(callid, EINVAL); |
213 | ipc_answer_0(rid, EINVAL); |
213 | ipc_answer_0(rid, EINVAL); |
214 | return; |
214 | return; |
215 | } |
215 | } |
216 | 216 | ||
217 | futex_down(&fs_head_futex); |
217 | futex_down(&fs_head_futex); |
218 | 218 | ||
219 | /* |
219 | /* |
220 | * Check for duplicit registrations. |
220 | * Check for duplicit registrations. |
221 | */ |
221 | */ |
222 | if (fs_name_to_handle(fs_info->vfs_info.name, false)) { |
222 | if (fs_name_to_handle(fs_info->vfs_info.name, false)) { |
223 | /* |
223 | /* |
224 | * We already register a fs like this. |
224 | * We already register a fs like this. |
225 | */ |
225 | */ |
226 | dprintf("FS is already registered.\n"); |
226 | dprintf("FS is already registered.\n"); |
227 | futex_up(&fs_head_futex); |
227 | futex_up(&fs_head_futex); |
228 | free(fs_info); |
228 | free(fs_info); |
229 | ipc_answer_0(callid, EEXISTS); |
229 | ipc_answer_0(callid, EEXISTS); |
230 | ipc_answer_0(rid, EEXISTS); |
230 | ipc_answer_0(rid, EEXISTS); |
231 | return; |
231 | return; |
232 | } |
232 | } |
233 | 233 | ||
234 | /* |
234 | /* |
235 | * Add fs_info to the list of registered FS's. |
235 | * Add fs_info to the list of registered FS's. |
236 | */ |
236 | */ |
237 | dprintf("Inserting FS into the list of registered file systems.\n"); |
237 | dprintf("Inserting FS into the list of registered file systems.\n"); |
238 | list_append(&fs_info->fs_link, &fs_head); |
238 | list_append(&fs_info->fs_link, &fs_head); |
239 | 239 | ||
240 | /* |
240 | /* |
241 | * Now we want the client to send us the IPC_M_CONNECT_TO_ME call so |
241 | * Now we want the client to send us the IPC_M_CONNECT_TO_ME call so |
242 | * that a callback connection is created and we have a phone through |
242 | * that a callback connection is created and we have a phone through |
243 | * which to forward VFS requests to it. |
243 | * which to forward VFS requests to it. |
244 | */ |
244 | */ |
245 | callid = async_get_call(&call); |
245 | callid = async_get_call(&call); |
246 | if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) { |
246 | if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) { |
247 | dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call)); |
247 | dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call)); |
248 | list_remove(&fs_info->fs_link); |
248 | list_remove(&fs_info->fs_link); |
249 | futex_up(&fs_head_futex); |
249 | futex_up(&fs_head_futex); |
250 | free(fs_info); |
250 | free(fs_info); |
251 | ipc_answer_0(callid, EINVAL); |
251 | ipc_answer_0(callid, EINVAL); |
252 | ipc_answer_0(rid, EINVAL); |
252 | ipc_answer_0(rid, EINVAL); |
253 | return; |
253 | return; |
254 | } |
254 | } |
255 | fs_info->phone = IPC_GET_ARG3(call); |
255 | fs_info->phone = IPC_GET_ARG5(call); |
256 | ipc_answer_0(callid, EOK); |
256 | ipc_answer_0(callid, EOK); |
257 | 257 | ||
258 | dprintf("Callback connection to FS created.\n"); |
258 | dprintf("Callback connection to FS created.\n"); |
259 | 259 | ||
260 | /* |
260 | /* |
261 | * The client will want us to send him the address space area with PLB. |
261 | * The client will want us to send him the address space area with PLB. |
262 | */ |
262 | */ |
263 | callid = async_get_call(&call); |
263 | callid = async_get_call(&call); |
264 | if (IPC_GET_METHOD(call) != IPC_M_AS_AREA_RECV) { |
264 | if (IPC_GET_METHOD(call) != IPC_M_AS_AREA_RECV) { |
265 | dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call)); |
265 | dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call)); |
266 | list_remove(&fs_info->fs_link); |
266 | list_remove(&fs_info->fs_link); |
267 | futex_up(&fs_head_futex); |
267 | futex_up(&fs_head_futex); |
268 | ipc_hangup(fs_info->phone); |
268 | ipc_hangup(fs_info->phone); |
269 | free(fs_info); |
269 | free(fs_info); |
270 | ipc_answer_0(callid, EINVAL); |
270 | ipc_answer_0(callid, EINVAL); |
271 | ipc_answer_0(rid, EINVAL); |
271 | ipc_answer_0(rid, EINVAL); |
272 | return; |
272 | return; |
273 | } |
273 | } |
274 | 274 | ||
275 | /* |
275 | /* |
276 | * We can only send the client address space area PLB_SIZE bytes long. |
276 | * We can only send the client address space area PLB_SIZE bytes long. |
277 | */ |
277 | */ |
278 | size = IPC_GET_ARG2(call); |
278 | size = IPC_GET_ARG2(call); |
279 | if (size != PLB_SIZE) { |
279 | if (size != PLB_SIZE) { |
280 | dprintf("Client suggests wrong size of PFB, size = %d\n", size); |
280 | dprintf("Client suggests wrong size of PFB, size = %d\n", size); |
281 | list_remove(&fs_info->fs_link); |
281 | list_remove(&fs_info->fs_link); |
282 | futex_up(&fs_head_futex); |
282 | futex_up(&fs_head_futex); |
283 | ipc_hangup(fs_info->phone); |
283 | ipc_hangup(fs_info->phone); |
284 | free(fs_info); |
284 | free(fs_info); |
285 | ipc_answer_0(callid, EINVAL); |
285 | ipc_answer_0(callid, EINVAL); |
286 | ipc_answer_0(rid, EINVAL); |
286 | ipc_answer_0(rid, EINVAL); |
287 | return; |
287 | return; |
288 | } |
288 | } |
289 | 289 | ||
290 | /* |
290 | /* |
291 | * Commit to read-only sharing the PLB with the client. |
291 | * Commit to read-only sharing the PLB with the client. |
292 | */ |
292 | */ |
293 | ipc_answer_2(callid, EOK, (ipcarg_t) plb, |
293 | ipc_answer_2(callid, EOK, (ipcarg_t) plb, |
294 | (ipcarg_t) (AS_AREA_READ | AS_AREA_CACHEABLE)); |
294 | (ipcarg_t) (AS_AREA_READ | AS_AREA_CACHEABLE)); |
295 | 295 | ||
296 | dprintf("Sharing PLB.\n"); |
296 | dprintf("Sharing PLB.\n"); |
297 | 297 | ||
298 | /* |
298 | /* |
299 | * That was it. The FS has been registered. |
299 | * That was it. The FS has been registered. |
300 | * In reply to the VFS_REGISTER request, we assign the client file |
300 | * In reply to the VFS_REGISTER request, we assign the client file |
301 | * system a global file system handle. |
301 | * system a global file system handle. |
302 | */ |
302 | */ |
303 | fs_info->fs_handle = (int) atomic_postinc(&fs_handle_next); |
303 | fs_info->fs_handle = (int) atomic_postinc(&fs_handle_next); |
304 | ipc_answer_1(rid, EOK, (ipcarg_t) fs_info->fs_handle); |
304 | ipc_answer_1(rid, EOK, (ipcarg_t) fs_info->fs_handle); |
305 | 305 | ||
306 | futex_up(&fs_head_futex); |
306 | futex_up(&fs_head_futex); |
307 | 307 | ||
308 | dprintf("\"%.*s\" filesystem successfully registered, handle=%d.\n", |
308 | dprintf("\"%.*s\" filesystem successfully registered, handle=%d.\n", |
309 | FS_NAME_MAXLEN, fs_info->vfs_info.name, fs_info->fs_handle); |
309 | FS_NAME_MAXLEN, fs_info->vfs_info.name, fs_info->fs_handle); |
310 | } |
310 | } |
311 | 311 | ||
312 | /** For a given file system handle, implement policy for allocating a phone. |
312 | /** For a given file system handle, implement policy for allocating a phone. |
313 | * |
313 | * |
314 | * @param handle File system handle. |
314 | * @param handle File system handle. |
315 | * |
315 | * |
316 | * @return Phone over which a multi-call request can be safely |
316 | * @return Phone over which a multi-call request can be safely |
317 | * sent. Return 0 if no phone was found. |
317 | * sent. Return 0 if no phone was found. |
318 | */ |
318 | */ |
319 | int vfs_grab_phone(int handle) |
319 | int vfs_grab_phone(int handle) |
320 | { |
320 | { |
321 | /* |
321 | /* |
322 | * For now, we don't try to be very clever and very fast. |
322 | * For now, we don't try to be very clever and very fast. |
323 | * We simply lookup the phone in the fs_head list. We currently don't |
323 | * We simply lookup the phone in the fs_head list. We currently don't |
324 | * open any additional phones (even though that itself would be pretty |
324 | * open any additional phones (even though that itself would be pretty |
325 | * straightforward; housekeeping multiple open phones to a FS task would |
325 | * straightforward; housekeeping multiple open phones to a FS task would |
326 | * be more demanding). Instead, we simply take the respective |
326 | * be more demanding). Instead, we simply take the respective |
327 | * phone_futex and keep it until vfs_release_phone(). |
327 | * phone_futex and keep it until vfs_release_phone(). |
328 | */ |
328 | */ |
329 | futex_down(&fs_head_futex); |
329 | futex_down(&fs_head_futex); |
330 | link_t *cur; |
330 | link_t *cur; |
331 | fs_info_t *fs; |
331 | fs_info_t *fs; |
332 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
332 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
333 | fs = list_get_instance(cur, fs_info_t, fs_link); |
333 | fs = list_get_instance(cur, fs_info_t, fs_link); |
334 | if (fs->fs_handle == handle) { |
334 | if (fs->fs_handle == handle) { |
335 | futex_up(&fs_head_futex); |
335 | futex_up(&fs_head_futex); |
336 | /* |
336 | /* |
337 | * For now, take the futex unconditionally. |
337 | * For now, take the futex unconditionally. |
338 | * Oh yeah, serialization rocks. |
338 | * Oh yeah, serialization rocks. |
339 | * It will be up'ed in vfs_release_phone(). |
339 | * It will be up'ed in vfs_release_phone(). |
340 | */ |
340 | */ |
341 | futex_down(&fs->phone_futex); |
341 | futex_down(&fs->phone_futex); |
342 | /* |
342 | /* |
343 | * Avoid deadlock with other fibrils in the same thread |
343 | * Avoid deadlock with other fibrils in the same thread |
344 | * by disabling fibril preemption. |
344 | * by disabling fibril preemption. |
345 | */ |
345 | */ |
346 | fibril_inc_sercount(); |
346 | fibril_inc_sercount(); |
347 | return fs->phone; |
347 | return fs->phone; |
348 | } |
348 | } |
349 | } |
349 | } |
350 | futex_up(&fs_head_futex); |
350 | futex_up(&fs_head_futex); |
351 | return 0; |
351 | return 0; |
352 | } |
352 | } |
353 | 353 | ||
354 | /** Tell VFS that the phone is in use for any request. |
354 | /** Tell VFS that the phone is in use for any request. |
355 | * |
355 | * |
356 | * @param phone Phone to FS task. |
356 | * @param phone Phone to FS task. |
357 | */ |
357 | */ |
358 | void vfs_release_phone(int phone) |
358 | void vfs_release_phone(int phone) |
359 | { |
359 | { |
360 | bool found = false; |
360 | bool found = false; |
361 | 361 | ||
362 | /* |
362 | /* |
363 | * Undo the fibril_inc_sercount() done in vfs_grab_phone(). |
363 | * Undo the fibril_inc_sercount() done in vfs_grab_phone(). |
364 | */ |
364 | */ |
365 | fibril_dec_sercount(); |
365 | fibril_dec_sercount(); |
366 | 366 | ||
367 | futex_down(&fs_head_futex); |
367 | futex_down(&fs_head_futex); |
368 | link_t *cur; |
368 | link_t *cur; |
369 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
369 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
370 | fs_info_t *fs = list_get_instance(cur, fs_info_t, fs_link); |
370 | fs_info_t *fs = list_get_instance(cur, fs_info_t, fs_link); |
371 | if (fs->phone == phone) { |
371 | if (fs->phone == phone) { |
372 | found = true; |
372 | found = true; |
373 | futex_up(&fs_head_futex); |
373 | futex_up(&fs_head_futex); |
374 | futex_up(&fs->phone_futex); |
374 | futex_up(&fs->phone_futex); |
375 | return; |
375 | return; |
376 | } |
376 | } |
377 | } |
377 | } |
378 | futex_up(&fs_head_futex); |
378 | futex_up(&fs_head_futex); |
379 | 379 | ||
380 | /* |
380 | /* |
381 | * Not good to get here. |
381 | * Not good to get here. |
382 | */ |
382 | */ |
383 | assert(found == true); |
383 | assert(found == true); |
384 | } |
384 | } |
385 | 385 | ||
386 | /** Convert file system name to its handle. |
386 | /** Convert file system name to its handle. |
387 | * |
387 | * |
388 | * @param name File system name. |
388 | * @param name File system name. |
389 | * @param lock If true, the function will down and up the |
389 | * @param lock If true, the function will down and up the |
390 | * fs_head_futex. |
390 | * fs_head_futex. |
391 | * |
391 | * |
392 | * @return File system handle or zero if file system not found. |
392 | * @return File system handle or zero if file system not found. |
393 | */ |
393 | */ |
394 | int fs_name_to_handle(char *name, bool lock) |
394 | int fs_name_to_handle(char *name, bool lock) |
395 | { |
395 | { |
396 | int handle = 0; |
396 | int handle = 0; |
397 | 397 | ||
398 | if (lock) |
398 | if (lock) |
399 | futex_down(&fs_head_futex); |
399 | futex_down(&fs_head_futex); |
400 | link_t *cur; |
400 | link_t *cur; |
401 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
401 | for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
402 | fs_info_t *fs = list_get_instance(cur, fs_info_t, fs_link); |
402 | fs_info_t *fs = list_get_instance(cur, fs_info_t, fs_link); |
403 | if (strcmp(fs->vfs_info.name, name) == 0) { /* XXX: strncmp() */ |
403 | if (strcmp(fs->vfs_info.name, name) == 0) { /* XXX: strncmp() */ |
404 | handle = fs->fs_handle; |
404 | handle = fs->fs_handle; |
405 | break; |
405 | break; |
406 | } |
406 | } |
407 | } |
407 | } |
408 | if (lock) |
408 | if (lock) |
409 | futex_up(&fs_head_futex); |
409 | futex_up(&fs_head_futex); |
410 | return handle; |
410 | return handle; |
411 | } |
411 | } |
412 | 412 | ||
413 | /** |
413 | /** |
414 | * @} |
414 | * @} |
415 | */ |
415 | */ |
416 | 416 |