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