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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_ops.c |
34 | * @file vfs_ops.c |
35 | * @brief Operations that VFS offers to its clients. |
35 | * @brief Operations that VFS offers to its clients. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include "vfs.h" |
38 | #include "vfs.h" |
39 | #include <ipc/ipc.h> |
39 | #include <ipc/ipc.h> |
40 | #include <async.h> |
40 | #include <async.h> |
41 | #include <errno.h> |
41 | #include <errno.h> |
42 | #include <stdio.h> |
42 | #include <stdio.h> |
43 | #include <stdlib.h> |
43 | #include <stdlib.h> |
44 | #include <string.h> |
44 | #include <string.h> |
45 | #include <bool.h> |
45 | #include <bool.h> |
46 | #include <fibril_sync.h> |
46 | #include <fibril_sync.h> |
47 | #include <adt/list.h> |
47 | #include <adt/list.h> |
48 | #include <unistd.h> |
48 | #include <unistd.h> |
49 | #include <ctype.h> |
49 | #include <ctype.h> |
50 | #include <fcntl.h> |
50 | #include <fcntl.h> |
51 | #include <assert.h> |
51 | #include <assert.h> |
52 | #include <vfs/canonify.h> |
52 | #include <vfs/canonify.h> |
53 | 53 | ||
54 | /* Forward declarations of static functions. */ |
54 | /* Forward declarations of static functions. */ |
55 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
55 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
56 | 56 | ||
57 | /** Pending mount structure. */ |
- | |
58 | typedef struct { |
- | |
59 | link_t link; |
- | |
60 | char *fs_name; /**< File system name */ |
- | |
61 | char *mp; /**< Mount point */ |
- | |
62 | char *opts; /**< Mount options. */ |
- | |
63 | ipc_callid_t callid; /**< Call ID waiting for the mount */ |
- | |
64 | ipc_callid_t rid; /**< Request ID */ |
- | |
65 | dev_handle_t dev_handle; /**< Device handle */ |
- | |
66 | } pending_req_t; |
- | |
67 | - | ||
68 | FIBRIL_CONDVAR_INITIALIZE(pending_cv); |
- | |
69 | bool pending_new_fs = false; /**< True if a new file system was mounted. */ |
- | |
70 | LIST_INITIALIZE(pending_req); |
- | |
71 | - | ||
72 | /** |
57 | /** |
73 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
58 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
74 | * concurrent VFS operation which modifies the file system namespace. |
59 | * concurrent VFS operation which modifies the file system namespace. |
75 | */ |
60 | */ |
76 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
61 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
77 | 62 | ||
78 | vfs_pair_t rootfs = { |
63 | vfs_pair_t rootfs = { |
79 | .fs_handle = 0, |
64 | .fs_handle = 0, |
80 | .dev_handle = 0 |
65 | .dev_handle = 0 |
81 | }; |
66 | }; |
82 | 67 | ||
83 | static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle, |
68 | static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle, |
84 | fs_handle_t fs_handle, char *mp, char *opts) |
69 | fs_handle_t fs_handle, char *mp, char *opts) |
85 | { |
70 | { |
86 | vfs_lookup_res_t mp_res; |
71 | vfs_lookup_res_t mp_res; |
87 | vfs_lookup_res_t mr_res; |
72 | vfs_lookup_res_t mr_res; |
88 | vfs_node_t *mp_node = NULL; |
73 | vfs_node_t *mp_node = NULL; |
89 | vfs_node_t *mr_node; |
74 | vfs_node_t *mr_node; |
90 | fs_index_t rindex; |
75 | fs_index_t rindex; |
91 | size_t rsize; |
76 | size_t rsize; |
92 | unsigned rlnkcnt; |
77 | unsigned rlnkcnt; |
93 | ipcarg_t rc; |
78 | ipcarg_t rc; |
94 | int phone; |
79 | int phone; |
95 | aid_t msg; |
80 | aid_t msg; |
96 | ipc_call_t answer; |
81 | ipc_call_t answer; |
97 | 82 | ||
98 | /* Resolve the path to the mountpoint. */ |
83 | /* Resolve the path to the mountpoint. */ |
99 | fibril_rwlock_write_lock(&namespace_rwlock); |
84 | fibril_rwlock_write_lock(&namespace_rwlock); |
100 | if (rootfs.fs_handle) { |
85 | if (rootfs.fs_handle) { |
101 | /* We already have the root FS. */ |
86 | /* We already have the root FS. */ |
102 | if (str_cmp(mp, "/") == 0) { |
87 | if (str_cmp(mp, "/") == 0) { |
103 | /* Trying to mount root FS over root FS */ |
88 | /* Trying to mount root FS over root FS */ |
104 | fibril_rwlock_write_unlock(&namespace_rwlock); |
89 | fibril_rwlock_write_unlock(&namespace_rwlock); |
105 | ipc_answer_0(rid, EBUSY); |
90 | ipc_answer_0(rid, EBUSY); |
106 | return; |
91 | return; |
107 | } |
92 | } |
108 | 93 | ||
109 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
94 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
110 | if (rc != EOK) { |
95 | if (rc != EOK) { |
111 | /* The lookup failed for some reason. */ |
96 | /* The lookup failed for some reason. */ |
112 | fibril_rwlock_write_unlock(&namespace_rwlock); |
97 | fibril_rwlock_write_unlock(&namespace_rwlock); |
113 | ipc_answer_0(rid, rc); |
98 | ipc_answer_0(rid, rc); |
114 | return; |
99 | return; |
115 | } |
100 | } |
116 | 101 | ||
117 | mp_node = vfs_node_get(&mp_res); |
102 | mp_node = vfs_node_get(&mp_res); |
118 | if (!mp_node) { |
103 | if (!mp_node) { |
119 | fibril_rwlock_write_unlock(&namespace_rwlock); |
104 | fibril_rwlock_write_unlock(&namespace_rwlock); |
120 | ipc_answer_0(rid, ENOMEM); |
105 | ipc_answer_0(rid, ENOMEM); |
121 | return; |
106 | return; |
122 | } |
107 | } |
123 | 108 | ||
124 | /* |
109 | /* |
125 | * Now we hold a reference to mp_node. |
110 | * Now we hold a reference to mp_node. |
126 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
111 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
127 | * This prevents the mount point from being deleted. |
112 | * This prevents the mount point from being deleted. |
128 | */ |
113 | */ |
129 | } else { |
114 | } else { |
130 | /* We still don't have the root file system mounted. */ |
115 | /* We still don't have the root file system mounted. */ |
131 | if (str_cmp(mp, "/") == 0) { |
116 | if (str_cmp(mp, "/") == 0) { |
132 | /* |
117 | /* |
133 | * For this simple, but important case, |
118 | * For this simple, but important case, |
134 | * we are almost done. |
119 | * we are almost done. |
135 | */ |
120 | */ |
136 | 121 | ||
137 | /* Tell the mountee that it is being mounted. */ |
122 | /* Tell the mountee that it is being mounted. */ |
138 | phone = vfs_grab_phone(fs_handle); |
123 | phone = vfs_grab_phone(fs_handle); |
139 | msg = async_send_1(phone, VFS_MOUNTED, |
124 | msg = async_send_1(phone, VFS_MOUNTED, |
140 | (ipcarg_t) dev_handle, &answer); |
125 | (ipcarg_t) dev_handle, &answer); |
141 | /* send the mount options */ |
126 | /* send the mount options */ |
142 | rc = ipc_data_write_start(phone, (void *)opts, |
127 | rc = ipc_data_write_start(phone, (void *)opts, |
143 | str_size(opts)); |
128 | str_size(opts)); |
144 | if (rc != EOK) { |
129 | if (rc != EOK) { |
145 | async_wait_for(msg, NULL); |
130 | async_wait_for(msg, NULL); |
146 | vfs_release_phone(phone); |
131 | vfs_release_phone(phone); |
147 | fibril_rwlock_write_unlock(&namespace_rwlock); |
132 | fibril_rwlock_write_unlock(&namespace_rwlock); |
148 | ipc_answer_0(rid, rc); |
133 | ipc_answer_0(rid, rc); |
149 | return; |
134 | return; |
150 | } |
135 | } |
151 | async_wait_for(msg, &rc); |
136 | async_wait_for(msg, &rc); |
152 | vfs_release_phone(phone); |
137 | vfs_release_phone(phone); |
153 | 138 | ||
154 | if (rc != EOK) { |
139 | if (rc != EOK) { |
155 | fibril_rwlock_write_unlock(&namespace_rwlock); |
140 | fibril_rwlock_write_unlock(&namespace_rwlock); |
156 | ipc_answer_0(rid, rc); |
141 | ipc_answer_0(rid, rc); |
157 | return; |
142 | return; |
158 | } |
143 | } |
159 | 144 | ||
160 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
145 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
161 | rsize = (size_t) IPC_GET_ARG2(answer); |
146 | rsize = (size_t) IPC_GET_ARG2(answer); |
162 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
147 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
163 | 148 | ||
164 | mr_res.triplet.fs_handle = fs_handle; |
149 | mr_res.triplet.fs_handle = fs_handle; |
165 | mr_res.triplet.dev_handle = dev_handle; |
150 | mr_res.triplet.dev_handle = dev_handle; |
166 | mr_res.triplet.index = rindex; |
151 | mr_res.triplet.index = rindex; |
167 | mr_res.size = rsize; |
152 | mr_res.size = rsize; |
168 | mr_res.lnkcnt = rlnkcnt; |
153 | mr_res.lnkcnt = rlnkcnt; |
169 | mr_res.type = VFS_NODE_DIRECTORY; |
154 | mr_res.type = VFS_NODE_DIRECTORY; |
170 | 155 | ||
171 | rootfs.fs_handle = fs_handle; |
156 | rootfs.fs_handle = fs_handle; |
172 | rootfs.dev_handle = dev_handle; |
157 | rootfs.dev_handle = dev_handle; |
173 | 158 | ||
174 | /* Add reference to the mounted root. */ |
159 | /* Add reference to the mounted root. */ |
175 | mr_node = vfs_node_get(&mr_res); |
160 | mr_node = vfs_node_get(&mr_res); |
176 | assert(mr_node); |
161 | assert(mr_node); |
177 | 162 | ||
178 | fibril_rwlock_write_unlock(&namespace_rwlock); |
163 | fibril_rwlock_write_unlock(&namespace_rwlock); |
179 | ipc_answer_0(rid, rc); |
164 | ipc_answer_0(rid, rc); |
180 | return; |
165 | return; |
181 | } else { |
166 | } else { |
182 | /* |
167 | /* |
183 | * We can't resolve this without the root filesystem |
168 | * We can't resolve this without the root filesystem |
184 | * being mounted first. |
169 | * being mounted first. |
185 | */ |
170 | */ |
186 | fibril_rwlock_write_unlock(&namespace_rwlock); |
171 | fibril_rwlock_write_unlock(&namespace_rwlock); |
187 | ipc_answer_0(rid, ENOENT); |
172 | ipc_answer_0(rid, ENOENT); |
188 | return; |
173 | return; |
189 | } |
174 | } |
190 | } |
175 | } |
191 | 176 | ||
192 | /* |
177 | /* |
193 | * At this point, we have all necessary pieces: file system and device |
178 | * At this point, we have all necessary pieces: file system and device |
194 | * handles, and we know the mount point VFS node. |
179 | * handles, and we know the mount point VFS node. |
195 | */ |
180 | */ |
196 | 181 | ||
197 | int mountee_phone = vfs_grab_phone(fs_handle); |
182 | int mountee_phone = vfs_grab_phone(fs_handle); |
198 | assert(mountee_phone >= 0); |
183 | assert(mountee_phone >= 0); |
199 | 184 | ||
200 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
185 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
201 | msg = async_send_4(phone, VFS_MOUNT, |
186 | msg = async_send_4(phone, VFS_MOUNT, |
202 | (ipcarg_t) mp_res.triplet.dev_handle, |
187 | (ipcarg_t) mp_res.triplet.dev_handle, |
203 | (ipcarg_t) mp_res.triplet.index, |
188 | (ipcarg_t) mp_res.triplet.index, |
204 | (ipcarg_t) fs_handle, |
189 | (ipcarg_t) fs_handle, |
205 | (ipcarg_t) dev_handle, &answer); |
190 | (ipcarg_t) dev_handle, &answer); |
206 | 191 | ||
207 | /* send connection */ |
192 | /* send connection */ |
208 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
193 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
209 | if (rc != EOK) { |
194 | if (rc != EOK) { |
210 | async_wait_for(msg, NULL); |
195 | async_wait_for(msg, NULL); |
211 | vfs_release_phone(mountee_phone); |
196 | vfs_release_phone(mountee_phone); |
212 | vfs_release_phone(phone); |
197 | vfs_release_phone(phone); |
213 | /* Mount failed, drop reference to mp_node. */ |
198 | /* Mount failed, drop reference to mp_node. */ |
214 | if (mp_node) |
199 | if (mp_node) |
215 | vfs_node_put(mp_node); |
200 | vfs_node_put(mp_node); |
216 | ipc_answer_0(rid, rc); |
201 | ipc_answer_0(rid, rc); |
217 | fibril_rwlock_write_unlock(&namespace_rwlock); |
202 | fibril_rwlock_write_unlock(&namespace_rwlock); |
218 | return; |
203 | return; |
219 | } |
204 | } |
220 | 205 | ||
221 | vfs_release_phone(mountee_phone); |
206 | vfs_release_phone(mountee_phone); |
222 | 207 | ||
223 | /* send the mount options */ |
208 | /* send the mount options */ |
224 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
209 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
225 | if (rc != EOK) { |
210 | if (rc != EOK) { |
226 | async_wait_for(msg, NULL); |
211 | async_wait_for(msg, NULL); |
227 | vfs_release_phone(phone); |
212 | vfs_release_phone(phone); |
228 | /* Mount failed, drop reference to mp_node. */ |
213 | /* Mount failed, drop reference to mp_node. */ |
229 | if (mp_node) |
214 | if (mp_node) |
230 | vfs_node_put(mp_node); |
215 | vfs_node_put(mp_node); |
231 | fibril_rwlock_write_unlock(&namespace_rwlock); |
216 | fibril_rwlock_write_unlock(&namespace_rwlock); |
232 | ipc_answer_0(rid, rc); |
217 | ipc_answer_0(rid, rc); |
233 | return; |
218 | return; |
234 | } |
219 | } |
235 | async_wait_for(msg, &rc); |
220 | async_wait_for(msg, &rc); |
236 | vfs_release_phone(phone); |
221 | vfs_release_phone(phone); |
237 | 222 | ||
238 | if (rc == EOK) { |
223 | if (rc == EOK) { |
239 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
224 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
240 | rsize = (size_t) IPC_GET_ARG2(answer); |
225 | rsize = (size_t) IPC_GET_ARG2(answer); |
241 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
226 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
242 | 227 | ||
243 | mr_res.triplet.fs_handle = fs_handle; |
228 | mr_res.triplet.fs_handle = fs_handle; |
244 | mr_res.triplet.dev_handle = dev_handle; |
229 | mr_res.triplet.dev_handle = dev_handle; |
245 | mr_res.triplet.index = rindex; |
230 | mr_res.triplet.index = rindex; |
246 | mr_res.size = rsize; |
231 | mr_res.size = rsize; |
247 | mr_res.lnkcnt = rlnkcnt; |
232 | mr_res.lnkcnt = rlnkcnt; |
248 | mr_res.type = VFS_NODE_DIRECTORY; |
233 | mr_res.type = VFS_NODE_DIRECTORY; |
249 | 234 | ||
250 | /* Add reference to the mounted root. */ |
235 | /* Add reference to the mounted root. */ |
251 | mr_node = vfs_node_get(&mr_res); |
236 | mr_node = vfs_node_get(&mr_res); |
252 | assert(mr_node); |
237 | assert(mr_node); |
253 | } else { |
238 | } else { |
254 | /* Mount failed, drop reference to mp_node. */ |
239 | /* Mount failed, drop reference to mp_node. */ |
255 | if (mp_node) |
240 | if (mp_node) |
256 | vfs_node_put(mp_node); |
241 | vfs_node_put(mp_node); |
257 | } |
242 | } |
258 | 243 | ||
259 | ipc_answer_0(rid, rc); |
244 | ipc_answer_0(rid, rc); |
260 | fibril_rwlock_write_unlock(&namespace_rwlock); |
245 | fibril_rwlock_write_unlock(&namespace_rwlock); |
261 | } |
246 | } |
262 | 247 | ||
263 | /** Process pending mount requests */ |
- | |
264 | void vfs_process_pending_mount(void) |
- | |
265 | { |
- | |
266 | link_t *cur; |
- | |
267 | - | ||
268 | while (true) { |
- | |
269 | fibril_mutex_lock(&fs_head_lock); |
- | |
270 | while (!pending_new_fs) |
- | |
271 | fibril_condvar_wait(&pending_cv, &fs_head_lock); |
- | |
272 | rescan: |
- | |
273 | for (cur = pending_req.next; cur != &pending_req; |
- | |
274 | cur = cur->next) { |
- | |
275 | pending_req_t *pr = list_get_instance(cur, |
- | |
276 | pending_req_t, link); |
- | |
277 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, |
- | |
278 | false); |
- | |
279 | if (!fs_handle) |
- | |
280 | continue; |
- | |
281 | - | ||
282 | /* Acknowledge that we know fs_name. */ |
- | |
283 | ipc_answer_0(pr->callid, EOK); |
- | |
284 | - | ||
285 | list_remove(cur); |
- | |
286 | fibril_mutex_unlock(&fs_head_lock); |
- | |
287 | - | ||
288 | /* Do the mount */ |
- | |
289 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, |
- | |
290 | pr->mp, pr->opts); |
- | |
291 | - | ||
292 | free(pr->fs_name); |
- | |
293 | free(pr->mp); |
- | |
294 | free(pr->opts); |
- | |
295 | free(pr); |
- | |
296 | - | ||
297 | fibril_mutex_lock(&fs_head_lock); |
- | |
298 | goto rescan; |
- | |
299 | } |
- | |
300 | pending_new_fs = false; |
- | |
301 | fibril_mutex_unlock(&fs_head_lock); |
- | |
302 | } |
- | |
303 | } |
- | |
304 | - | ||
305 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
248 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
306 | { |
249 | { |
307 | /* |
250 | /* |
308 | * We expect the library to do the device-name to device-handle |
251 | * We expect the library to do the device-name to device-handle |
309 | * translation for us, thus the device handle will arrive as ARG1 |
252 | * translation for us, thus the device handle will arrive as ARG1 |
310 | * in the request. |
253 | * in the request. |
311 | */ |
254 | */ |
312 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
255 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
313 | 256 | ||
314 | /* |
257 | /* |
315 | * Mount flags are passed as ARG2. |
258 | * Mount flags are passed as ARG2. |
316 | */ |
259 | */ |
317 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
260 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
318 | 261 | ||
319 | /* |
262 | /* |
320 | * For now, don't make use of ARG3, but it can be used to |
263 | * For now, don't make use of ARG3, but it can be used to |
321 | * carry mount options in the future. |
264 | * carry mount options in the future. |
322 | */ |
265 | */ |
323 | 266 | ||
324 | /* We want the client to send us the mount point. */ |
267 | /* We want the client to send us the mount point. */ |
325 | ipc_callid_t callid; |
268 | ipc_callid_t callid; |
326 | size_t size; |
269 | size_t size; |
327 | if (!ipc_data_write_receive(&callid, &size)) { |
270 | if (!ipc_data_write_receive(&callid, &size)) { |
328 | ipc_answer_0(callid, EINVAL); |
271 | ipc_answer_0(callid, EINVAL); |
329 | ipc_answer_0(rid, EINVAL); |
272 | ipc_answer_0(rid, EINVAL); |
330 | return; |
273 | return; |
331 | } |
274 | } |
332 | 275 | ||
333 | /* Check whether size is reasonable wrt. the mount point. */ |
276 | /* Check whether size is reasonable wrt. the mount point. */ |
334 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
277 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
335 | ipc_answer_0(callid, EINVAL); |
278 | ipc_answer_0(callid, EINVAL); |
336 | ipc_answer_0(rid, EINVAL); |
279 | ipc_answer_0(rid, EINVAL); |
337 | return; |
280 | return; |
338 | } |
281 | } |
339 | 282 | ||
340 | /* Allocate buffer for the mount point data being received. */ |
283 | /* Allocate buffer for the mount point data being received. */ |
341 | char *mp = malloc(size + 1); |
284 | char *mp = malloc(size + 1); |
342 | if (!mp) { |
285 | if (!mp) { |
343 | ipc_answer_0(callid, ENOMEM); |
286 | ipc_answer_0(callid, ENOMEM); |
344 | ipc_answer_0(rid, ENOMEM); |
287 | ipc_answer_0(rid, ENOMEM); |
345 | return; |
288 | return; |
346 | } |
289 | } |
347 | 290 | ||
348 | /* Deliver the mount point. */ |
291 | /* Deliver the mount point. */ |
349 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
292 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
350 | if (retval != EOK) { |
293 | if (retval != EOK) { |
351 | ipc_answer_0(rid, retval); |
294 | ipc_answer_0(rid, retval); |
352 | free(mp); |
295 | free(mp); |
353 | return; |
296 | return; |
354 | } |
297 | } |
355 | mp[size] = '\0'; |
298 | mp[size] = '\0'; |
356 | 299 | ||
357 | /* Now we expect to receive the mount options. */ |
300 | /* Now we expect to receive the mount options. */ |
358 | if (!ipc_data_write_receive(&callid, &size)) { |
301 | if (!ipc_data_write_receive(&callid, &size)) { |
359 | ipc_answer_0(callid, EINVAL); |
302 | ipc_answer_0(callid, EINVAL); |
360 | ipc_answer_0(rid, EINVAL); |
303 | ipc_answer_0(rid, EINVAL); |
361 | free(mp); |
304 | free(mp); |
362 | return; |
305 | return; |
363 | } |
306 | } |
364 | 307 | ||
365 | /* Check the offered options size. */ |
308 | /* Check the offered options size. */ |
366 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
309 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
367 | ipc_answer_0(callid, EINVAL); |
310 | ipc_answer_0(callid, EINVAL); |
368 | ipc_answer_0(rid, EINVAL); |
311 | ipc_answer_0(rid, EINVAL); |
369 | free(mp); |
312 | free(mp); |
370 | return; |
313 | return; |
371 | } |
314 | } |
372 | 315 | ||
373 | /* Allocate buffer for the mount options. */ |
316 | /* Allocate buffer for the mount options. */ |
374 | char *opts = (char *) malloc(size + 1); |
317 | char *opts = (char *) malloc(size + 1); |
375 | if (!opts) { |
318 | if (!opts) { |
376 | ipc_answer_0(callid, ENOMEM); |
319 | ipc_answer_0(callid, ENOMEM); |
377 | ipc_answer_0(rid, ENOMEM); |
320 | ipc_answer_0(rid, ENOMEM); |
378 | free(mp); |
321 | free(mp); |
379 | return; |
322 | return; |
380 | } |
323 | } |
381 | 324 | ||
382 | /* Deliver the mount options. */ |
325 | /* Deliver the mount options. */ |
383 | retval = ipc_data_write_finalize(callid, opts, size); |
326 | retval = ipc_data_write_finalize(callid, opts, size); |
384 | if (retval != EOK) { |
327 | if (retval != EOK) { |
385 | ipc_answer_0(rid, retval); |
328 | ipc_answer_0(rid, retval); |
386 | free(mp); |
329 | free(mp); |
387 | free(opts); |
330 | free(opts); |
388 | return; |
331 | return; |
389 | } |
332 | } |
390 | opts[size] = '\0'; |
333 | opts[size] = '\0'; |
391 | 334 | ||
392 | /* |
335 | /* |
393 | * Now, we expect the client to send us data with the name of the file |
336 | * Now, we expect the client to send us data with the name of the file |
394 | * system. |
337 | * system. |
395 | */ |
338 | */ |
396 | if (!ipc_data_write_receive(&callid, &size)) { |
339 | if (!ipc_data_write_receive(&callid, &size)) { |
397 | ipc_answer_0(callid, EINVAL); |
340 | ipc_answer_0(callid, EINVAL); |
398 | ipc_answer_0(rid, EINVAL); |
341 | ipc_answer_0(rid, EINVAL); |
399 | free(mp); |
342 | free(mp); |
400 | free(opts); |
343 | free(opts); |
401 | return; |
344 | return; |
402 | } |
345 | } |
403 | 346 | ||
404 | /* |
347 | /* |
405 | * Don't receive more than is necessary for storing a full file system |
348 | * Don't receive more than is necessary for storing a full file system |
406 | * name. |
349 | * name. |
407 | */ |
350 | */ |
408 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
351 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
409 | ipc_answer_0(callid, EINVAL); |
352 | ipc_answer_0(callid, EINVAL); |
410 | ipc_answer_0(rid, EINVAL); |
353 | ipc_answer_0(rid, EINVAL); |
411 | free(mp); |
354 | free(mp); |
412 | free(opts); |
355 | free(opts); |
413 | return; |
356 | return; |
414 | } |
357 | } |
415 | 358 | ||
416 | /* |
359 | /* |
417 | * Allocate buffer for file system name. |
360 | * Allocate buffer for file system name. |
418 | */ |
361 | */ |
419 | char *fs_name = (char *) malloc(size + 1); |
362 | char *fs_name = (char *) malloc(size + 1); |
420 | if (fs_name == NULL) { |
363 | if (fs_name == NULL) { |
421 | ipc_answer_0(callid, ENOMEM); |
364 | ipc_answer_0(callid, ENOMEM); |
422 | ipc_answer_0(rid, ENOMEM); |
365 | ipc_answer_0(rid, ENOMEM); |
423 | free(mp); |
366 | free(mp); |
424 | free(opts); |
367 | free(opts); |
425 | return; |
368 | return; |
426 | } |
369 | } |
427 | 370 | ||
428 | /* Deliver the file system name. */ |
371 | /* Deliver the file system name. */ |
429 | retval = ipc_data_write_finalize(callid, fs_name, size); |
372 | retval = ipc_data_write_finalize(callid, fs_name, size); |
430 | if (retval != EOK) { |
373 | if (retval != EOK) { |
431 | ipc_answer_0(rid, retval); |
374 | ipc_answer_0(rid, retval); |
432 | free(mp); |
375 | free(mp); |
433 | free(opts); |
376 | free(opts); |
434 | free(fs_name); |
377 | free(fs_name); |
435 | return; |
378 | return; |
436 | } |
379 | } |
437 | fs_name[size] = '\0'; |
380 | fs_name[size] = '\0'; |
438 | 381 | ||
439 | /* |
382 | /* |
440 | * Wait for IPC_M_PING so that we can return an error if we don't know |
383 | * Wait for IPC_M_PING so that we can return an error if we don't know |
441 | * fs_name. |
384 | * fs_name. |
442 | */ |
385 | */ |
443 | ipc_call_t data; |
386 | ipc_call_t data; |
444 | callid = async_get_call(&data); |
387 | callid = async_get_call(&data); |
445 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
388 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
446 | ipc_answer_0(callid, ENOTSUP); |
389 | ipc_answer_0(callid, ENOTSUP); |
447 | ipc_answer_0(rid, ENOTSUP); |
390 | ipc_answer_0(rid, ENOTSUP); |
448 | free(mp); |
391 | free(mp); |
449 | free(opts); |
392 | free(opts); |
450 | free(fs_name); |
393 | free(fs_name); |
451 | return; |
394 | return; |
452 | } |
395 | } |
453 | 396 | ||
454 | /* |
397 | /* |
455 | * Check if we know a file system with the same name as is in fs_name. |
398 | * Check if we know a file system with the same name as is in fs_name. |
456 | * This will also give us its file system handle. |
399 | * This will also give us its file system handle. |
457 | */ |
400 | */ |
458 | fibril_mutex_lock(&fs_head_lock); |
401 | fibril_mutex_lock(&fs_head_lock); |
- | 402 | fs_handle_t fs_handle; |
|
- | 403 | recheck: |
|
459 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, false); |
404 | fs_handle = fs_name_to_handle(fs_name, false); |
460 | if (!fs_handle) { |
405 | if (!fs_handle) { |
461 | if (flags & IPC_FLAG_BLOCKING) { |
406 | if (flags & IPC_FLAG_BLOCKING) { |
462 | pending_req_t *pr; |
- | |
463 | - | ||
464 | /* Blocking mount, add to pending list */ |
- | |
465 | pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
- | |
466 | if (!pr) { |
- | |
467 | fibril_mutex_unlock(&fs_head_lock); |
407 | fibril_condvar_wait(&fs_head_cv, &fs_head_lock); |
468 | ipc_answer_0(callid, ENOMEM); |
- | |
469 | ipc_answer_0(rid, ENOMEM); |
- | |
470 | free(mp); |
408 | goto recheck; |
471 | free(fs_name); |
- | |
472 | free(opts); |
- | |
473 | return; |
- | |
474 | } |
- | |
475 | - | ||
476 | pr->fs_name = fs_name; |
- | |
477 | pr->mp = mp; |
- | |
478 | pr->opts = opts; |
- | |
479 | pr->callid = callid; |
- | |
480 | pr->rid = rid; |
- | |
481 | pr->dev_handle = dev_handle; |
- | |
482 | link_initialize(&pr->link); |
- | |
483 | list_append(&pr->link, &pending_req); |
- | |
484 | fibril_mutex_unlock(&fs_head_lock); |
- | |
485 | return; |
- | |
486 | } |
409 | } |
487 | 410 | ||
488 | fibril_mutex_unlock(&fs_head_lock); |
411 | fibril_mutex_unlock(&fs_head_lock); |
489 | ipc_answer_0(callid, ENOENT); |
412 | ipc_answer_0(callid, ENOENT); |
490 | ipc_answer_0(rid, ENOENT); |
413 | ipc_answer_0(rid, ENOENT); |
491 | free(mp); |
414 | free(mp); |
492 | free(fs_name); |
415 | free(fs_name); |
493 | free(opts); |
416 | free(opts); |
494 | return; |
417 | return; |
495 | } |
418 | } |
496 | fibril_mutex_unlock(&fs_head_lock); |
419 | fibril_mutex_unlock(&fs_head_lock); |
497 | 420 | ||
498 | /* Acknowledge that we know fs_name. */ |
421 | /* Acknowledge that we know fs_name. */ |
499 | ipc_answer_0(callid, EOK); |
422 | ipc_answer_0(callid, EOK); |
500 | 423 | ||
501 | /* Do the mount */ |
424 | /* Do the mount */ |
502 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
425 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
503 | free(mp); |
426 | free(mp); |
504 | free(fs_name); |
427 | free(fs_name); |
505 | free(opts); |
428 | free(opts); |
506 | } |
429 | } |
507 | 430 | ||
508 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
431 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
509 | { |
432 | { |
510 | if (!vfs_files_init()) { |
433 | if (!vfs_files_init()) { |
511 | ipc_answer_0(rid, ENOMEM); |
434 | ipc_answer_0(rid, ENOMEM); |
512 | return; |
435 | return; |
513 | } |
436 | } |
514 | 437 | ||
515 | /* |
438 | /* |
516 | * The POSIX interface is open(path, oflag, mode). |
439 | * The POSIX interface is open(path, oflag, mode). |
517 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
440 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
518 | * will need to arrive in another call. |
441 | * will need to arrive in another call. |
519 | * |
442 | * |
520 | * We also receive one private, non-POSIX set of flags called lflag |
443 | * We also receive one private, non-POSIX set of flags called lflag |
521 | * used to pass information to vfs_lookup_internal(). |
444 | * used to pass information to vfs_lookup_internal(). |
522 | */ |
445 | */ |
523 | int lflag = IPC_GET_ARG1(*request); |
446 | int lflag = IPC_GET_ARG1(*request); |
524 | int oflag = IPC_GET_ARG2(*request); |
447 | int oflag = IPC_GET_ARG2(*request); |
525 | int mode = IPC_GET_ARG3(*request); |
448 | int mode = IPC_GET_ARG3(*request); |
526 | size_t len; |
449 | size_t len; |
527 | 450 | ||
528 | /* |
451 | /* |
529 | * Make sure that we are called with exactly one of L_FILE and |
452 | * Make sure that we are called with exactly one of L_FILE and |
530 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
453 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
531 | */ |
454 | */ |
532 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
455 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
533 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
456 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
534 | ((lflag & L_OPEN) != 0)) { |
457 | ((lflag & L_OPEN) != 0)) { |
535 | ipc_answer_0(rid, EINVAL); |
458 | ipc_answer_0(rid, EINVAL); |
536 | return; |
459 | return; |
537 | } |
460 | } |
538 | 461 | ||
539 | if (oflag & O_CREAT) |
462 | if (oflag & O_CREAT) |
540 | lflag |= L_CREATE; |
463 | lflag |= L_CREATE; |
541 | if (oflag & O_EXCL) |
464 | if (oflag & O_EXCL) |
542 | lflag |= L_EXCLUSIVE; |
465 | lflag |= L_EXCLUSIVE; |
543 | 466 | ||
544 | ipc_callid_t callid; |
467 | ipc_callid_t callid; |
545 | if (!ipc_data_write_receive(&callid, &len)) { |
468 | if (!ipc_data_write_receive(&callid, &len)) { |
546 | ipc_answer_0(callid, EINVAL); |
469 | ipc_answer_0(callid, EINVAL); |
547 | ipc_answer_0(rid, EINVAL); |
470 | ipc_answer_0(rid, EINVAL); |
548 | return; |
471 | return; |
549 | } |
472 | } |
550 | 473 | ||
551 | char *path = malloc(len + 1); |
474 | char *path = malloc(len + 1); |
552 | if (!path) { |
475 | if (!path) { |
553 | ipc_answer_0(callid, ENOMEM); |
476 | ipc_answer_0(callid, ENOMEM); |
554 | ipc_answer_0(rid, ENOMEM); |
477 | ipc_answer_0(rid, ENOMEM); |
555 | return; |
478 | return; |
556 | } |
479 | } |
557 | 480 | ||
558 | int rc; |
481 | int rc; |
559 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
482 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
560 | ipc_answer_0(rid, rc); |
483 | ipc_answer_0(rid, rc); |
561 | free(path); |
484 | free(path); |
562 | return; |
485 | return; |
563 | } |
486 | } |
564 | path[len] = '\0'; |
487 | path[len] = '\0'; |
565 | 488 | ||
566 | /* |
489 | /* |
567 | * Avoid the race condition in which the file can be deleted before we |
490 | * Avoid the race condition in which the file can be deleted before we |
568 | * find/create-and-lock the VFS node corresponding to the looked-up |
491 | * find/create-and-lock the VFS node corresponding to the looked-up |
569 | * triplet. |
492 | * triplet. |
570 | */ |
493 | */ |
571 | if (lflag & L_CREATE) |
494 | if (lflag & L_CREATE) |
572 | fibril_rwlock_write_lock(&namespace_rwlock); |
495 | fibril_rwlock_write_lock(&namespace_rwlock); |
573 | else |
496 | else |
574 | fibril_rwlock_read_lock(&namespace_rwlock); |
497 | fibril_rwlock_read_lock(&namespace_rwlock); |
575 | 498 | ||
576 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
499 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
577 | vfs_lookup_res_t lr; |
500 | vfs_lookup_res_t lr; |
578 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
501 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
579 | if (rc != EOK) { |
502 | if (rc != EOK) { |
580 | if (lflag & L_CREATE) |
503 | if (lflag & L_CREATE) |
581 | fibril_rwlock_write_unlock(&namespace_rwlock); |
504 | fibril_rwlock_write_unlock(&namespace_rwlock); |
582 | else |
505 | else |
583 | fibril_rwlock_read_unlock(&namespace_rwlock); |
506 | fibril_rwlock_read_unlock(&namespace_rwlock); |
584 | ipc_answer_0(rid, rc); |
507 | ipc_answer_0(rid, rc); |
585 | free(path); |
508 | free(path); |
586 | return; |
509 | return; |
587 | } |
510 | } |
588 | 511 | ||
589 | /* Path is no longer needed. */ |
512 | /* Path is no longer needed. */ |
590 | free(path); |
513 | free(path); |
591 | 514 | ||
592 | vfs_node_t *node = vfs_node_get(&lr); |
515 | vfs_node_t *node = vfs_node_get(&lr); |
593 | if (lflag & L_CREATE) |
516 | if (lflag & L_CREATE) |
594 | fibril_rwlock_write_unlock(&namespace_rwlock); |
517 | fibril_rwlock_write_unlock(&namespace_rwlock); |
595 | else |
518 | else |
596 | fibril_rwlock_read_unlock(&namespace_rwlock); |
519 | fibril_rwlock_read_unlock(&namespace_rwlock); |
597 | 520 | ||
598 | /* Truncate the file if requested and if necessary. */ |
521 | /* Truncate the file if requested and if necessary. */ |
599 | if (oflag & O_TRUNC) { |
522 | if (oflag & O_TRUNC) { |
600 | fibril_rwlock_write_lock(&node->contents_rwlock); |
523 | fibril_rwlock_write_lock(&node->contents_rwlock); |
601 | if (node->size) { |
524 | if (node->size) { |
602 | rc = vfs_truncate_internal(node->fs_handle, |
525 | rc = vfs_truncate_internal(node->fs_handle, |
603 | node->dev_handle, node->index, 0); |
526 | node->dev_handle, node->index, 0); |
604 | if (rc) { |
527 | if (rc) { |
605 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
528 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
606 | vfs_node_put(node); |
529 | vfs_node_put(node); |
607 | ipc_answer_0(rid, rc); |
530 | ipc_answer_0(rid, rc); |
608 | return; |
531 | return; |
609 | } |
532 | } |
610 | node->size = 0; |
533 | node->size = 0; |
611 | } |
534 | } |
612 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
535 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
613 | } |
536 | } |
614 | 537 | ||
615 | /* |
538 | /* |
616 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
539 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
617 | * structure. |
540 | * structure. |
618 | */ |
541 | */ |
619 | int fd = vfs_fd_alloc(); |
542 | int fd = vfs_fd_alloc(); |
620 | if (fd < 0) { |
543 | if (fd < 0) { |
621 | vfs_node_put(node); |
544 | vfs_node_put(node); |
622 | ipc_answer_0(rid, fd); |
545 | ipc_answer_0(rid, fd); |
623 | return; |
546 | return; |
624 | } |
547 | } |
625 | vfs_file_t *file = vfs_file_get(fd); |
548 | vfs_file_t *file = vfs_file_get(fd); |
626 | file->node = node; |
549 | file->node = node; |
627 | if (oflag & O_APPEND) |
550 | if (oflag & O_APPEND) |
628 | file->append = true; |
551 | file->append = true; |
629 | 552 | ||
630 | /* |
553 | /* |
631 | * The following increase in reference count is for the fact that the |
554 | * The following increase in reference count is for the fact that the |
632 | * file is being opened and that a file structure is pointing to it. |
555 | * file is being opened and that a file structure is pointing to it. |
633 | * It is necessary so that the file will not disappear when |
556 | * It is necessary so that the file will not disappear when |
634 | * vfs_node_put() is called. The reference will be dropped by the |
557 | * vfs_node_put() is called. The reference will be dropped by the |
635 | * respective VFS_CLOSE. |
558 | * respective VFS_CLOSE. |
636 | */ |
559 | */ |
637 | vfs_node_addref(node); |
560 | vfs_node_addref(node); |
638 | vfs_node_put(node); |
561 | vfs_node_put(node); |
639 | 562 | ||
640 | /* Success! Return the new file descriptor to the client. */ |
563 | /* Success! Return the new file descriptor to the client. */ |
641 | ipc_answer_1(rid, EOK, fd); |
564 | ipc_answer_1(rid, EOK, fd); |
642 | } |
565 | } |
643 | 566 | ||
644 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
567 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
645 | { |
568 | { |
646 | // FIXME: check for sanity of the supplied fs, dev and index |
569 | // FIXME: check for sanity of the supplied fs, dev and index |
647 | 570 | ||
648 | if (!vfs_files_init()) { |
571 | if (!vfs_files_init()) { |
649 | ipc_answer_0(rid, ENOMEM); |
572 | ipc_answer_0(rid, ENOMEM); |
650 | return; |
573 | return; |
651 | } |
574 | } |
652 | 575 | ||
653 | /* |
576 | /* |
654 | * The interface is open_node(fs, dev, index, oflag). |
577 | * The interface is open_node(fs, dev, index, oflag). |
655 | */ |
578 | */ |
656 | vfs_lookup_res_t lr; |
579 | vfs_lookup_res_t lr; |
657 | 580 | ||
658 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
581 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
659 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
582 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
660 | lr.triplet.index = IPC_GET_ARG3(*request); |
583 | lr.triplet.index = IPC_GET_ARG3(*request); |
661 | int oflag = IPC_GET_ARG4(*request); |
584 | int oflag = IPC_GET_ARG4(*request); |
662 | 585 | ||
663 | fibril_rwlock_read_lock(&namespace_rwlock); |
586 | fibril_rwlock_read_lock(&namespace_rwlock); |
664 | 587 | ||
665 | int rc = vfs_open_node_internal(&lr); |
588 | int rc = vfs_open_node_internal(&lr); |
666 | if (rc != EOK) { |
589 | if (rc != EOK) { |
667 | fibril_rwlock_read_unlock(&namespace_rwlock); |
590 | fibril_rwlock_read_unlock(&namespace_rwlock); |
668 | ipc_answer_0(rid, rc); |
591 | ipc_answer_0(rid, rc); |
669 | return; |
592 | return; |
670 | } |
593 | } |
671 | 594 | ||
672 | vfs_node_t *node = vfs_node_get(&lr); |
595 | vfs_node_t *node = vfs_node_get(&lr); |
673 | fibril_rwlock_read_unlock(&namespace_rwlock); |
596 | fibril_rwlock_read_unlock(&namespace_rwlock); |
674 | 597 | ||
675 | /* Truncate the file if requested and if necessary. */ |
598 | /* Truncate the file if requested and if necessary. */ |
676 | if (oflag & O_TRUNC) { |
599 | if (oflag & O_TRUNC) { |
677 | fibril_rwlock_write_lock(&node->contents_rwlock); |
600 | fibril_rwlock_write_lock(&node->contents_rwlock); |
678 | if (node->size) { |
601 | if (node->size) { |
679 | rc = vfs_truncate_internal(node->fs_handle, |
602 | rc = vfs_truncate_internal(node->fs_handle, |
680 | node->dev_handle, node->index, 0); |
603 | node->dev_handle, node->index, 0); |
681 | if (rc) { |
604 | if (rc) { |
682 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
605 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
683 | vfs_node_put(node); |
606 | vfs_node_put(node); |
684 | ipc_answer_0(rid, rc); |
607 | ipc_answer_0(rid, rc); |
685 | return; |
608 | return; |
686 | } |
609 | } |
687 | node->size = 0; |
610 | node->size = 0; |
688 | } |
611 | } |
689 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
612 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
690 | } |
613 | } |
691 | 614 | ||
692 | /* |
615 | /* |
693 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
616 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
694 | * structure. |
617 | * structure. |
695 | */ |
618 | */ |
696 | int fd = vfs_fd_alloc(); |
619 | int fd = vfs_fd_alloc(); |
697 | if (fd < 0) { |
620 | if (fd < 0) { |
698 | vfs_node_put(node); |
621 | vfs_node_put(node); |
699 | ipc_answer_0(rid, fd); |
622 | ipc_answer_0(rid, fd); |
700 | return; |
623 | return; |
701 | } |
624 | } |
702 | vfs_file_t *file = vfs_file_get(fd); |
625 | vfs_file_t *file = vfs_file_get(fd); |
703 | file->node = node; |
626 | file->node = node; |
704 | if (oflag & O_APPEND) |
627 | if (oflag & O_APPEND) |
705 | file->append = true; |
628 | file->append = true; |
706 | 629 | ||
707 | /* |
630 | /* |
708 | * The following increase in reference count is for the fact that the |
631 | * The following increase in reference count is for the fact that the |
709 | * file is being opened and that a file structure is pointing to it. |
632 | * file is being opened and that a file structure is pointing to it. |
710 | * It is necessary so that the file will not disappear when |
633 | * It is necessary so that the file will not disappear when |
711 | * vfs_node_put() is called. The reference will be dropped by the |
634 | * vfs_node_put() is called. The reference will be dropped by the |
712 | * respective VFS_CLOSE. |
635 | * respective VFS_CLOSE. |
713 | */ |
636 | */ |
714 | vfs_node_addref(node); |
637 | vfs_node_addref(node); |
715 | vfs_node_put(node); |
638 | vfs_node_put(node); |
716 | 639 | ||
717 | /* Success! Return the new file descriptor to the client. */ |
640 | /* Success! Return the new file descriptor to the client. */ |
718 | ipc_answer_1(rid, EOK, fd); |
641 | ipc_answer_1(rid, EOK, fd); |
719 | } |
642 | } |
720 | 643 | ||
721 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
644 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
722 | { |
645 | { |
723 | int fd = IPC_GET_ARG1(*request); |
646 | int fd = IPC_GET_ARG1(*request); |
724 | 647 | ||
725 | /* Lookup the file structure corresponding to the file descriptor. */ |
648 | /* Lookup the file structure corresponding to the file descriptor. */ |
726 | vfs_file_t *file = vfs_file_get(fd); |
649 | vfs_file_t *file = vfs_file_get(fd); |
727 | if (!file) { |
650 | if (!file) { |
728 | ipc_answer_0(rid, ENOENT); |
651 | ipc_answer_0(rid, ENOENT); |
729 | return; |
652 | return; |
730 | } |
653 | } |
731 | 654 | ||
732 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
655 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
733 | file->node->index); |
656 | file->node->index); |
734 | } |
657 | } |
735 | 658 | ||
736 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
659 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
737 | { |
660 | { |
738 | int fd = IPC_GET_ARG1(*request); |
661 | int fd = IPC_GET_ARG1(*request); |
739 | 662 | ||
740 | /* Lookup the file structure corresponding to the file descriptor. */ |
663 | /* Lookup the file structure corresponding to the file descriptor. */ |
741 | vfs_file_t *file = vfs_file_get(fd); |
664 | vfs_file_t *file = vfs_file_get(fd); |
742 | if (!file) { |
665 | if (!file) { |
743 | ipc_answer_0(rid, ENOENT); |
666 | ipc_answer_0(rid, ENOENT); |
744 | return; |
667 | return; |
745 | } |
668 | } |
746 | 669 | ||
747 | /* |
670 | /* |
748 | * Lock the open file structure so that no other thread can manipulate |
671 | * Lock the open file structure so that no other thread can manipulate |
749 | * the same open file at a time. |
672 | * the same open file at a time. |
750 | */ |
673 | */ |
751 | fibril_mutex_lock(&file->lock); |
674 | fibril_mutex_lock(&file->lock); |
752 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
675 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
753 | 676 | ||
754 | /* Make a VFS_DEVICE request at the destination FS server. */ |
677 | /* Make a VFS_DEVICE request at the destination FS server. */ |
755 | aid_t msg; |
678 | aid_t msg; |
756 | ipc_call_t answer; |
679 | ipc_call_t answer; |
757 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
680 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
758 | file->node->dev_handle, file->node->index, &answer); |
681 | file->node->dev_handle, file->node->index, &answer); |
759 | 682 | ||
760 | /* Wait for reply from the FS server. */ |
683 | /* Wait for reply from the FS server. */ |
761 | ipcarg_t rc; |
684 | ipcarg_t rc; |
762 | async_wait_for(msg, &rc); |
685 | async_wait_for(msg, &rc); |
763 | 686 | ||
764 | vfs_release_phone(fs_phone); |
687 | vfs_release_phone(fs_phone); |
765 | fibril_mutex_unlock(&file->lock); |
688 | fibril_mutex_unlock(&file->lock); |
766 | 689 | ||
767 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
690 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
768 | } |
691 | } |
769 | 692 | ||
770 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
693 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
771 | { |
694 | { |
772 | int fd = IPC_GET_ARG1(*request); |
695 | int fd = IPC_GET_ARG1(*request); |
773 | 696 | ||
774 | /* Lookup the file structure corresponding to the file descriptor. */ |
697 | /* Lookup the file structure corresponding to the file descriptor. */ |
775 | vfs_file_t *file = vfs_file_get(fd); |
698 | vfs_file_t *file = vfs_file_get(fd); |
776 | if (!file) { |
699 | if (!file) { |
777 | ipc_answer_0(rid, ENOENT); |
700 | ipc_answer_0(rid, ENOENT); |
778 | return; |
701 | return; |
779 | } |
702 | } |
780 | 703 | ||
781 | /* |
704 | /* |
782 | * Lock the open file structure so that no other thread can manipulate |
705 | * Lock the open file structure so that no other thread can manipulate |
783 | * the same open file at a time. |
706 | * the same open file at a time. |
784 | */ |
707 | */ |
785 | fibril_mutex_lock(&file->lock); |
708 | fibril_mutex_lock(&file->lock); |
786 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
709 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
787 | 710 | ||
788 | /* Make a VFS_SYMC request at the destination FS server. */ |
711 | /* Make a VFS_SYMC request at the destination FS server. */ |
789 | aid_t msg; |
712 | aid_t msg; |
790 | ipc_call_t answer; |
713 | ipc_call_t answer; |
791 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
714 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
792 | file->node->dev_handle, file->node->index, &answer); |
715 | file->node->dev_handle, file->node->index, &answer); |
793 | 716 | ||
794 | /* Wait for reply from the FS server. */ |
717 | /* Wait for reply from the FS server. */ |
795 | ipcarg_t rc; |
718 | ipcarg_t rc; |
796 | async_wait_for(msg, &rc); |
719 | async_wait_for(msg, &rc); |
797 | 720 | ||
798 | vfs_release_phone(fs_phone); |
721 | vfs_release_phone(fs_phone); |
799 | fibril_mutex_unlock(&file->lock); |
722 | fibril_mutex_unlock(&file->lock); |
800 | 723 | ||
801 | ipc_answer_0(rid, rc); |
724 | ipc_answer_0(rid, rc); |
802 | } |
725 | } |
803 | 726 | ||
804 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
727 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
805 | { |
728 | { |
806 | int fd = IPC_GET_ARG1(*request); |
729 | int fd = IPC_GET_ARG1(*request); |
807 | 730 | ||
808 | /* Lookup the file structure corresponding to the file descriptor. */ |
731 | /* Lookup the file structure corresponding to the file descriptor. */ |
809 | vfs_file_t *file = vfs_file_get(fd); |
732 | vfs_file_t *file = vfs_file_get(fd); |
810 | if (!file) { |
733 | if (!file) { |
811 | ipc_answer_0(rid, ENOENT); |
734 | ipc_answer_0(rid, ENOENT); |
812 | return; |
735 | return; |
813 | } |
736 | } |
814 | 737 | ||
815 | /* |
738 | /* |
816 | * Lock the open file structure so that no other thread can manipulate |
739 | * Lock the open file structure so that no other thread can manipulate |
817 | * the same open file at a time. |
740 | * the same open file at a time. |
818 | */ |
741 | */ |
819 | fibril_mutex_lock(&file->lock); |
742 | fibril_mutex_lock(&file->lock); |
820 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
743 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
821 | 744 | ||
822 | /* Make a VFS_CLOSE request at the destination FS server. */ |
745 | /* Make a VFS_CLOSE request at the destination FS server. */ |
823 | aid_t msg; |
746 | aid_t msg; |
824 | ipc_call_t answer; |
747 | ipc_call_t answer; |
825 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
748 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
826 | file->node->dev_handle, file->node->index, &answer); |
749 | file->node->dev_handle, file->node->index, &answer); |
827 | 750 | ||
828 | /* Wait for reply from the FS server. */ |
751 | /* Wait for reply from the FS server. */ |
829 | ipcarg_t rc; |
752 | ipcarg_t rc; |
830 | async_wait_for(msg, &rc); |
753 | async_wait_for(msg, &rc); |
831 | 754 | ||
832 | vfs_release_phone(fs_phone); |
755 | vfs_release_phone(fs_phone); |
833 | fibril_mutex_unlock(&file->lock); |
756 | fibril_mutex_unlock(&file->lock); |
834 | 757 | ||
835 | int retval = IPC_GET_ARG1(answer); |
758 | int retval = IPC_GET_ARG1(answer); |
836 | if (retval != EOK) |
759 | if (retval != EOK) |
837 | ipc_answer_0(rid, retval); |
760 | ipc_answer_0(rid, retval); |
838 | 761 | ||
839 | retval = vfs_fd_free(fd); |
762 | retval = vfs_fd_free(fd); |
840 | ipc_answer_0(rid, retval); |
763 | ipc_answer_0(rid, retval); |
841 | } |
764 | } |
842 | 765 | ||
843 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
766 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
844 | { |
767 | { |
845 | 768 | ||
846 | /* |
769 | /* |
847 | * The following code strongly depends on the fact that the files data |
770 | * The following code strongly depends on the fact that the files data |
848 | * structure can be only accessed by a single fibril and all file |
771 | * structure can be only accessed by a single fibril and all file |
849 | * operations are serialized (i.e. the reads and writes cannot |
772 | * operations are serialized (i.e. the reads and writes cannot |
850 | * interleave and a file cannot be closed while it is being read). |
773 | * interleave and a file cannot be closed while it is being read). |
851 | * |
774 | * |
852 | * Additional synchronization needs to be added once the table of |
775 | * Additional synchronization needs to be added once the table of |
853 | * open files supports parallel access! |
776 | * open files supports parallel access! |
854 | */ |
777 | */ |
855 | 778 | ||
856 | int fd = IPC_GET_ARG1(*request); |
779 | int fd = IPC_GET_ARG1(*request); |
857 | 780 | ||
858 | /* Lookup the file structure corresponding to the file descriptor. */ |
781 | /* Lookup the file structure corresponding to the file descriptor. */ |
859 | vfs_file_t *file = vfs_file_get(fd); |
782 | vfs_file_t *file = vfs_file_get(fd); |
860 | if (!file) { |
783 | if (!file) { |
861 | ipc_answer_0(rid, ENOENT); |
784 | ipc_answer_0(rid, ENOENT); |
862 | return; |
785 | return; |
863 | } |
786 | } |
864 | 787 | ||
865 | /* |
788 | /* |
866 | * Now we need to receive a call with client's |
789 | * Now we need to receive a call with client's |
867 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
790 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
868 | */ |
791 | */ |
869 | ipc_callid_t callid; |
792 | ipc_callid_t callid; |
870 | int res; |
793 | int res; |
871 | if (read) |
794 | if (read) |
872 | res = ipc_data_read_receive(&callid, NULL); |
795 | res = ipc_data_read_receive(&callid, NULL); |
873 | else |
796 | else |
874 | res = ipc_data_write_receive(&callid, NULL); |
797 | res = ipc_data_write_receive(&callid, NULL); |
875 | if (!res) { |
798 | if (!res) { |
876 | ipc_answer_0(callid, EINVAL); |
799 | ipc_answer_0(callid, EINVAL); |
877 | ipc_answer_0(rid, EINVAL); |
800 | ipc_answer_0(rid, EINVAL); |
878 | return; |
801 | return; |
879 | } |
802 | } |
880 | 803 | ||
881 | /* |
804 | /* |
882 | * Lock the open file structure so that no other thread can manipulate |
805 | * Lock the open file structure so that no other thread can manipulate |
883 | * the same open file at a time. |
806 | * the same open file at a time. |
884 | */ |
807 | */ |
885 | fibril_mutex_lock(&file->lock); |
808 | fibril_mutex_lock(&file->lock); |
886 | 809 | ||
887 | /* |
810 | /* |
888 | * Lock the file's node so that no other client can read/write to it at |
811 | * Lock the file's node so that no other client can read/write to it at |
889 | * the same time. |
812 | * the same time. |
890 | */ |
813 | */ |
891 | if (read) |
814 | if (read) |
892 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
815 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
893 | else |
816 | else |
894 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
817 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
895 | 818 | ||
896 | if (file->node->type == VFS_NODE_DIRECTORY) { |
819 | if (file->node->type == VFS_NODE_DIRECTORY) { |
897 | /* |
820 | /* |
898 | * Make sure that no one is modifying the namespace |
821 | * Make sure that no one is modifying the namespace |
899 | * while we are in readdir(). |
822 | * while we are in readdir(). |
900 | */ |
823 | */ |
901 | assert(read); |
824 | assert(read); |
902 | fibril_rwlock_read_lock(&namespace_rwlock); |
825 | fibril_rwlock_read_lock(&namespace_rwlock); |
903 | } |
826 | } |
904 | 827 | ||
905 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
828 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
906 | 829 | ||
907 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
830 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
908 | aid_t msg; |
831 | aid_t msg; |
909 | ipc_call_t answer; |
832 | ipc_call_t answer; |
910 | if (!read && file->append) |
833 | if (!read && file->append) |
911 | file->pos = file->node->size; |
834 | file->pos = file->node->size; |
912 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
835 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
913 | file->node->dev_handle, file->node->index, file->pos, &answer); |
836 | file->node->dev_handle, file->node->index, file->pos, &answer); |
914 | 837 | ||
915 | /* |
838 | /* |
916 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
839 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
917 | * destination FS server. The call will be routed as if sent by |
840 | * destination FS server. The call will be routed as if sent by |
918 | * ourselves. Note that call arguments are immutable in this case so we |
841 | * ourselves. Note that call arguments are immutable in this case so we |
919 | * don't have to bother. |
842 | * don't have to bother. |
920 | */ |
843 | */ |
921 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
844 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
922 | 845 | ||
923 | /* Wait for reply from the FS server. */ |
846 | /* Wait for reply from the FS server. */ |
924 | ipcarg_t rc; |
847 | ipcarg_t rc; |
925 | async_wait_for(msg, &rc); |
848 | async_wait_for(msg, &rc); |
926 | 849 | ||
927 | vfs_release_phone(fs_phone); |
850 | vfs_release_phone(fs_phone); |
928 | 851 | ||
929 | size_t bytes = IPC_GET_ARG1(answer); |
852 | size_t bytes = IPC_GET_ARG1(answer); |
930 | 853 | ||
931 | if (file->node->type == VFS_NODE_DIRECTORY) |
854 | if (file->node->type == VFS_NODE_DIRECTORY) |
932 | fibril_rwlock_read_unlock(&namespace_rwlock); |
855 | fibril_rwlock_read_unlock(&namespace_rwlock); |
933 | 856 | ||
934 | /* Unlock the VFS node. */ |
857 | /* Unlock the VFS node. */ |
935 | if (read) |
858 | if (read) |
936 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
859 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
937 | else { |
860 | else { |
938 | /* Update the cached version of node's size. */ |
861 | /* Update the cached version of node's size. */ |
939 | if (rc == EOK) |
862 | if (rc == EOK) |
940 | file->node->size = IPC_GET_ARG2(answer); |
863 | file->node->size = IPC_GET_ARG2(answer); |
941 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
864 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
942 | } |
865 | } |
943 | 866 | ||
944 | /* Update the position pointer and unlock the open file. */ |
867 | /* Update the position pointer and unlock the open file. */ |
945 | if (rc == EOK) |
868 | if (rc == EOK) |
946 | file->pos += bytes; |
869 | file->pos += bytes; |
947 | fibril_mutex_unlock(&file->lock); |
870 | fibril_mutex_unlock(&file->lock); |
948 | 871 | ||
949 | /* |
872 | /* |
950 | * FS server's reply is the final result of the whole operation we |
873 | * FS server's reply is the final result of the whole operation we |
951 | * return to the client. |
874 | * return to the client. |
952 | */ |
875 | */ |
953 | ipc_answer_1(rid, rc, bytes); |
876 | ipc_answer_1(rid, rc, bytes); |
954 | } |
877 | } |
955 | 878 | ||
956 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
879 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
957 | { |
880 | { |
958 | vfs_rdwr(rid, request, true); |
881 | vfs_rdwr(rid, request, true); |
959 | } |
882 | } |
960 | 883 | ||
961 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
884 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
962 | { |
885 | { |
963 | vfs_rdwr(rid, request, false); |
886 | vfs_rdwr(rid, request, false); |
964 | } |
887 | } |
965 | 888 | ||
966 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
889 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
967 | { |
890 | { |
968 | int fd = (int) IPC_GET_ARG1(*request); |
891 | int fd = (int) IPC_GET_ARG1(*request); |
969 | off_t off = (off_t) IPC_GET_ARG2(*request); |
892 | off_t off = (off_t) IPC_GET_ARG2(*request); |
970 | int whence = (int) IPC_GET_ARG3(*request); |
893 | int whence = (int) IPC_GET_ARG3(*request); |
971 | 894 | ||
972 | 895 | ||
973 | /* Lookup the file structure corresponding to the file descriptor. */ |
896 | /* Lookup the file structure corresponding to the file descriptor. */ |
974 | vfs_file_t *file = vfs_file_get(fd); |
897 | vfs_file_t *file = vfs_file_get(fd); |
975 | if (!file) { |
898 | if (!file) { |
976 | ipc_answer_0(rid, ENOENT); |
899 | ipc_answer_0(rid, ENOENT); |
977 | return; |
900 | return; |
978 | } |
901 | } |
979 | 902 | ||
980 | off_t newpos; |
903 | off_t newpos; |
981 | fibril_mutex_lock(&file->lock); |
904 | fibril_mutex_lock(&file->lock); |
982 | if (whence == SEEK_SET) { |
905 | if (whence == SEEK_SET) { |
983 | file->pos = off; |
906 | file->pos = off; |
984 | fibril_mutex_unlock(&file->lock); |
907 | fibril_mutex_unlock(&file->lock); |
985 | ipc_answer_1(rid, EOK, off); |
908 | ipc_answer_1(rid, EOK, off); |
986 | return; |
909 | return; |
987 | } |
910 | } |
988 | if (whence == SEEK_CUR) { |
911 | if (whence == SEEK_CUR) { |
989 | if (file->pos + off < file->pos) { |
912 | if (file->pos + off < file->pos) { |
990 | fibril_mutex_unlock(&file->lock); |
913 | fibril_mutex_unlock(&file->lock); |
991 | ipc_answer_0(rid, EOVERFLOW); |
914 | ipc_answer_0(rid, EOVERFLOW); |
992 | return; |
915 | return; |
993 | } |
916 | } |
994 | file->pos += off; |
917 | file->pos += off; |
995 | newpos = file->pos; |
918 | newpos = file->pos; |
996 | fibril_mutex_unlock(&file->lock); |
919 | fibril_mutex_unlock(&file->lock); |
997 | ipc_answer_1(rid, EOK, newpos); |
920 | ipc_answer_1(rid, EOK, newpos); |
998 | return; |
921 | return; |
999 | } |
922 | } |
1000 | if (whence == SEEK_END) { |
923 | if (whence == SEEK_END) { |
1001 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
924 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
1002 | size_t size = file->node->size; |
925 | size_t size = file->node->size; |
1003 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
926 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
1004 | if (size + off < size) { |
927 | if (size + off < size) { |
1005 | fibril_mutex_unlock(&file->lock); |
928 | fibril_mutex_unlock(&file->lock); |
1006 | ipc_answer_0(rid, EOVERFLOW); |
929 | ipc_answer_0(rid, EOVERFLOW); |
1007 | return; |
930 | return; |
1008 | } |
931 | } |
1009 | newpos = size + off; |
932 | newpos = size + off; |
1010 | fibril_mutex_unlock(&file->lock); |
933 | fibril_mutex_unlock(&file->lock); |
1011 | ipc_answer_1(rid, EOK, newpos); |
934 | ipc_answer_1(rid, EOK, newpos); |
1012 | return; |
935 | return; |
1013 | } |
936 | } |
1014 | fibril_mutex_unlock(&file->lock); |
937 | fibril_mutex_unlock(&file->lock); |
1015 | ipc_answer_0(rid, EINVAL); |
938 | ipc_answer_0(rid, EINVAL); |
1016 | } |
939 | } |
1017 | 940 | ||
1018 | int |
941 | int |
1019 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
942 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
1020 | fs_index_t index, size_t size) |
943 | fs_index_t index, size_t size) |
1021 | { |
944 | { |
1022 | ipcarg_t rc; |
945 | ipcarg_t rc; |
1023 | int fs_phone; |
946 | int fs_phone; |
1024 | 947 | ||
1025 | fs_phone = vfs_grab_phone(fs_handle); |
948 | fs_phone = vfs_grab_phone(fs_handle); |
1026 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
949 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
1027 | (ipcarg_t)index, (ipcarg_t)size); |
950 | (ipcarg_t)index, (ipcarg_t)size); |
1028 | vfs_release_phone(fs_phone); |
951 | vfs_release_phone(fs_phone); |
1029 | return (int)rc; |
952 | return (int)rc; |
1030 | } |
953 | } |
1031 | 954 | ||
1032 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
955 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
1033 | { |
956 | { |
1034 | int fd = IPC_GET_ARG1(*request); |
957 | int fd = IPC_GET_ARG1(*request); |
1035 | size_t size = IPC_GET_ARG2(*request); |
958 | size_t size = IPC_GET_ARG2(*request); |
1036 | int rc; |
959 | int rc; |
1037 | 960 | ||
1038 | vfs_file_t *file = vfs_file_get(fd); |
961 | vfs_file_t *file = vfs_file_get(fd); |
1039 | if (!file) { |
962 | if (!file) { |
1040 | ipc_answer_0(rid, ENOENT); |
963 | ipc_answer_0(rid, ENOENT); |
1041 | return; |
964 | return; |
1042 | } |
965 | } |
1043 | fibril_mutex_lock(&file->lock); |
966 | fibril_mutex_lock(&file->lock); |
1044 | 967 | ||
1045 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
968 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
1046 | rc = vfs_truncate_internal(file->node->fs_handle, |
969 | rc = vfs_truncate_internal(file->node->fs_handle, |
1047 | file->node->dev_handle, file->node->index, size); |
970 | file->node->dev_handle, file->node->index, size); |
1048 | if (rc == EOK) |
971 | if (rc == EOK) |
1049 | file->node->size = size; |
972 | file->node->size = size; |
1050 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
973 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
1051 | 974 | ||
1052 | fibril_mutex_unlock(&file->lock); |
975 | fibril_mutex_unlock(&file->lock); |
1053 | ipc_answer_0(rid, (ipcarg_t)rc); |
976 | ipc_answer_0(rid, (ipcarg_t)rc); |
1054 | } |
977 | } |
1055 | 978 | ||
1056 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
979 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
1057 | { |
980 | { |
1058 | int mode = IPC_GET_ARG1(*request); |
981 | int mode = IPC_GET_ARG1(*request); |
1059 | 982 | ||
1060 | size_t len; |
983 | size_t len; |
1061 | ipc_callid_t callid; |
984 | ipc_callid_t callid; |
1062 | 985 | ||
1063 | if (!ipc_data_write_receive(&callid, &len)) { |
986 | if (!ipc_data_write_receive(&callid, &len)) { |
1064 | ipc_answer_0(callid, EINVAL); |
987 | ipc_answer_0(callid, EINVAL); |
1065 | ipc_answer_0(rid, EINVAL); |
988 | ipc_answer_0(rid, EINVAL); |
1066 | return; |
989 | return; |
1067 | } |
990 | } |
1068 | char *path = malloc(len + 1); |
991 | char *path = malloc(len + 1); |
1069 | if (!path) { |
992 | if (!path) { |
1070 | ipc_answer_0(callid, ENOMEM); |
993 | ipc_answer_0(callid, ENOMEM); |
1071 | ipc_answer_0(rid, ENOMEM); |
994 | ipc_answer_0(rid, ENOMEM); |
1072 | return; |
995 | return; |
1073 | } |
996 | } |
1074 | int rc; |
997 | int rc; |
1075 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
998 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1076 | ipc_answer_0(rid, rc); |
999 | ipc_answer_0(rid, rc); |
1077 | free(path); |
1000 | free(path); |
1078 | return; |
1001 | return; |
1079 | } |
1002 | } |
1080 | path[len] = '\0'; |
1003 | path[len] = '\0'; |
1081 | 1004 | ||
1082 | fibril_rwlock_write_lock(&namespace_rwlock); |
1005 | fibril_rwlock_write_lock(&namespace_rwlock); |
1083 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
1006 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
1084 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
1007 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
1085 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1008 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1086 | free(path); |
1009 | free(path); |
1087 | ipc_answer_0(rid, rc); |
1010 | ipc_answer_0(rid, rc); |
1088 | } |
1011 | } |
1089 | 1012 | ||
1090 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
1013 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
1091 | { |
1014 | { |
1092 | int lflag = IPC_GET_ARG1(*request); |
1015 | int lflag = IPC_GET_ARG1(*request); |
1093 | 1016 | ||
1094 | size_t len; |
1017 | size_t len; |
1095 | ipc_callid_t callid; |
1018 | ipc_callid_t callid; |
1096 | 1019 | ||
1097 | if (!ipc_data_write_receive(&callid, &len)) { |
1020 | if (!ipc_data_write_receive(&callid, &len)) { |
1098 | ipc_answer_0(callid, EINVAL); |
1021 | ipc_answer_0(callid, EINVAL); |
1099 | ipc_answer_0(rid, EINVAL); |
1022 | ipc_answer_0(rid, EINVAL); |
1100 | return; |
1023 | return; |
1101 | } |
1024 | } |
1102 | char *path = malloc(len + 1); |
1025 | char *path = malloc(len + 1); |
1103 | if (!path) { |
1026 | if (!path) { |
1104 | ipc_answer_0(callid, ENOMEM); |
1027 | ipc_answer_0(callid, ENOMEM); |
1105 | ipc_answer_0(rid, ENOMEM); |
1028 | ipc_answer_0(rid, ENOMEM); |
1106 | return; |
1029 | return; |
1107 | } |
1030 | } |
1108 | int rc; |
1031 | int rc; |
1109 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1032 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1110 | ipc_answer_0(rid, rc); |
1033 | ipc_answer_0(rid, rc); |
1111 | free(path); |
1034 | free(path); |
1112 | return; |
1035 | return; |
1113 | } |
1036 | } |
1114 | path[len] = '\0'; |
1037 | path[len] = '\0'; |
1115 | 1038 | ||
1116 | fibril_rwlock_write_lock(&namespace_rwlock); |
1039 | fibril_rwlock_write_lock(&namespace_rwlock); |
1117 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
1040 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
1118 | vfs_lookup_res_t lr; |
1041 | vfs_lookup_res_t lr; |
1119 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
1042 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
1120 | free(path); |
1043 | free(path); |
1121 | if (rc != EOK) { |
1044 | if (rc != EOK) { |
1122 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1045 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1123 | ipc_answer_0(rid, rc); |
1046 | ipc_answer_0(rid, rc); |
1124 | return; |
1047 | return; |
1125 | } |
1048 | } |
1126 | 1049 | ||
1127 | /* |
1050 | /* |
1128 | * The name has already been unlinked by vfs_lookup_internal(). |
1051 | * The name has already been unlinked by vfs_lookup_internal(). |
1129 | * We have to get and put the VFS node to ensure that it is |
1052 | * We have to get and put the VFS node to ensure that it is |
1130 | * VFS_DESTROY'ed after the last reference to it is dropped. |
1053 | * VFS_DESTROY'ed after the last reference to it is dropped. |
1131 | */ |
1054 | */ |
1132 | vfs_node_t *node = vfs_node_get(&lr); |
1055 | vfs_node_t *node = vfs_node_get(&lr); |
1133 | fibril_mutex_lock(&nodes_mutex); |
1056 | fibril_mutex_lock(&nodes_mutex); |
1134 | node->lnkcnt--; |
1057 | node->lnkcnt--; |
1135 | fibril_mutex_unlock(&nodes_mutex); |
1058 | fibril_mutex_unlock(&nodes_mutex); |
1136 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1059 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1137 | vfs_node_put(node); |
1060 | vfs_node_put(node); |
1138 | ipc_answer_0(rid, EOK); |
1061 | ipc_answer_0(rid, EOK); |
1139 | } |
1062 | } |
1140 | 1063 | ||
1141 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
1064 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
1142 | { |
1065 | { |
1143 | size_t olen, nlen; |
1066 | size_t olen, nlen; |
1144 | ipc_callid_t callid; |
1067 | ipc_callid_t callid; |
1145 | int rc; |
1068 | int rc; |
1146 | 1069 | ||
1147 | /* Retrieve the old path. */ |
1070 | /* Retrieve the old path. */ |
1148 | if (!ipc_data_write_receive(&callid, &olen)) { |
1071 | if (!ipc_data_write_receive(&callid, &olen)) { |
1149 | ipc_answer_0(callid, EINVAL); |
1072 | ipc_answer_0(callid, EINVAL); |
1150 | ipc_answer_0(rid, EINVAL); |
1073 | ipc_answer_0(rid, EINVAL); |
1151 | return; |
1074 | return; |
1152 | } |
1075 | } |
1153 | char *old = malloc(olen + 1); |
1076 | char *old = malloc(olen + 1); |
1154 | if (!old) { |
1077 | if (!old) { |
1155 | ipc_answer_0(callid, ENOMEM); |
1078 | ipc_answer_0(callid, ENOMEM); |
1156 | ipc_answer_0(rid, ENOMEM); |
1079 | ipc_answer_0(rid, ENOMEM); |
1157 | return; |
1080 | return; |
1158 | } |
1081 | } |
1159 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
1082 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
1160 | ipc_answer_0(rid, rc); |
1083 | ipc_answer_0(rid, rc); |
1161 | free(old); |
1084 | free(old); |
1162 | return; |
1085 | return; |
1163 | } |
1086 | } |
1164 | old[olen] = '\0'; |
1087 | old[olen] = '\0'; |
1165 | 1088 | ||
1166 | /* Retrieve the new path. */ |
1089 | /* Retrieve the new path. */ |
1167 | if (!ipc_data_write_receive(&callid, &nlen)) { |
1090 | if (!ipc_data_write_receive(&callid, &nlen)) { |
1168 | ipc_answer_0(callid, EINVAL); |
1091 | ipc_answer_0(callid, EINVAL); |
1169 | ipc_answer_0(rid, EINVAL); |
1092 | ipc_answer_0(rid, EINVAL); |
1170 | free(old); |
1093 | free(old); |
1171 | return; |
1094 | return; |
1172 | } |
1095 | } |
1173 | char *new = malloc(nlen + 1); |
1096 | char *new = malloc(nlen + 1); |
1174 | if (!new) { |
1097 | if (!new) { |
1175 | ipc_answer_0(callid, ENOMEM); |
1098 | ipc_answer_0(callid, ENOMEM); |
1176 | ipc_answer_0(rid, ENOMEM); |
1099 | ipc_answer_0(rid, ENOMEM); |
1177 | free(old); |
1100 | free(old); |
1178 | return; |
1101 | return; |
1179 | } |
1102 | } |
1180 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
1103 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
1181 | ipc_answer_0(rid, rc); |
1104 | ipc_answer_0(rid, rc); |
1182 | free(old); |
1105 | free(old); |
1183 | free(new); |
1106 | free(new); |
1184 | return; |
1107 | return; |
1185 | } |
1108 | } |
1186 | new[nlen] = '\0'; |
1109 | new[nlen] = '\0'; |
1187 | 1110 | ||
1188 | char *oldc = canonify(old, &olen); |
1111 | char *oldc = canonify(old, &olen); |
1189 | char *newc = canonify(new, &nlen); |
1112 | char *newc = canonify(new, &nlen); |
1190 | if (!oldc || !newc) { |
1113 | if (!oldc || !newc) { |
1191 | ipc_answer_0(rid, EINVAL); |
1114 | ipc_answer_0(rid, EINVAL); |
1192 | free(old); |
1115 | free(old); |
1193 | free(new); |
1116 | free(new); |
1194 | return; |
1117 | return; |
1195 | } |
1118 | } |
1196 | oldc[olen] = '\0'; |
1119 | oldc[olen] = '\0'; |
1197 | newc[nlen] = '\0'; |
1120 | newc[nlen] = '\0'; |
1198 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
1121 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
1199 | ((newc[str_length(oldc)] == '/') || |
1122 | ((newc[str_length(oldc)] == '/') || |
1200 | (str_length(oldc) == 1) || |
1123 | (str_length(oldc) == 1) || |
1201 | (str_length(oldc) == str_length(newc)))) { |
1124 | (str_length(oldc) == str_length(newc)))) { |
1202 | /* |
1125 | /* |
1203 | * oldc is a prefix of newc and either |
1126 | * oldc is a prefix of newc and either |
1204 | * - newc continues with a / where oldc ends, or |
1127 | * - newc continues with a / where oldc ends, or |
1205 | * - oldc was / itself, or |
1128 | * - oldc was / itself, or |
1206 | * - oldc and newc are equal. |
1129 | * - oldc and newc are equal. |
1207 | */ |
1130 | */ |
1208 | ipc_answer_0(rid, EINVAL); |
1131 | ipc_answer_0(rid, EINVAL); |
1209 | free(old); |
1132 | free(old); |
1210 | free(new); |
1133 | free(new); |
1211 | return; |
1134 | return; |
1212 | } |
1135 | } |
1213 | 1136 | ||
1214 | vfs_lookup_res_t old_lr; |
1137 | vfs_lookup_res_t old_lr; |
1215 | vfs_lookup_res_t new_lr; |
1138 | vfs_lookup_res_t new_lr; |
1216 | vfs_lookup_res_t new_par_lr; |
1139 | vfs_lookup_res_t new_par_lr; |
1217 | fibril_rwlock_write_lock(&namespace_rwlock); |
1140 | fibril_rwlock_write_lock(&namespace_rwlock); |
1218 | /* Lookup the node belonging to the old file name. */ |
1141 | /* Lookup the node belonging to the old file name. */ |
1219 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
1142 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
1220 | if (rc != EOK) { |
1143 | if (rc != EOK) { |
1221 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1144 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1222 | ipc_answer_0(rid, rc); |
1145 | ipc_answer_0(rid, rc); |
1223 | free(old); |
1146 | free(old); |
1224 | free(new); |
1147 | free(new); |
1225 | return; |
1148 | return; |
1226 | } |
1149 | } |
1227 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
1150 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
1228 | if (!old_node) { |
1151 | if (!old_node) { |
1229 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1152 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1230 | ipc_answer_0(rid, ENOMEM); |
1153 | ipc_answer_0(rid, ENOMEM); |
1231 | free(old); |
1154 | free(old); |
1232 | free(new); |
1155 | free(new); |
1233 | return; |
1156 | return; |
1234 | } |
1157 | } |
1235 | /* Determine the path to the parent of the node with the new name. */ |
1158 | /* Determine the path to the parent of the node with the new name. */ |
1236 | char *parentc = str_dup(newc); |
1159 | char *parentc = str_dup(newc); |
1237 | if (!parentc) { |
1160 | if (!parentc) { |
1238 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1161 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1239 | ipc_answer_0(rid, rc); |
1162 | ipc_answer_0(rid, rc); |
1240 | free(old); |
1163 | free(old); |
1241 | free(new); |
1164 | free(new); |
1242 | return; |
1165 | return; |
1243 | } |
1166 | } |
1244 | char *lastsl = str_rchr(parentc + 1, '/'); |
1167 | char *lastsl = str_rchr(parentc + 1, '/'); |
1245 | if (lastsl) |
1168 | if (lastsl) |
1246 | *lastsl = '\0'; |
1169 | *lastsl = '\0'; |
1247 | else |
1170 | else |
1248 | parentc[1] = '\0'; |
1171 | parentc[1] = '\0'; |
1249 | /* Lookup parent of the new file name. */ |
1172 | /* Lookup parent of the new file name. */ |
1250 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
1173 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
1251 | free(parentc); /* not needed anymore */ |
1174 | free(parentc); /* not needed anymore */ |
1252 | if (rc != EOK) { |
1175 | if (rc != EOK) { |
1253 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1176 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1254 | ipc_answer_0(rid, rc); |
1177 | ipc_answer_0(rid, rc); |
1255 | free(old); |
1178 | free(old); |
1256 | free(new); |
1179 | free(new); |
1257 | return; |
1180 | return; |
1258 | } |
1181 | } |
1259 | /* Check whether linking to the same file system instance. */ |
1182 | /* Check whether linking to the same file system instance. */ |
1260 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
1183 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
1261 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
1184 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
1262 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1185 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1263 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
1186 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
1264 | free(old); |
1187 | free(old); |
1265 | free(new); |
1188 | free(new); |
1266 | return; |
1189 | return; |
1267 | } |
1190 | } |
1268 | /* Destroy the old link for the new name. */ |
1191 | /* Destroy the old link for the new name. */ |
1269 | vfs_node_t *new_node = NULL; |
1192 | vfs_node_t *new_node = NULL; |
1270 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
1193 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
1271 | switch (rc) { |
1194 | switch (rc) { |
1272 | case ENOENT: |
1195 | case ENOENT: |
1273 | /* simply not in our way */ |
1196 | /* simply not in our way */ |
1274 | break; |
1197 | break; |
1275 | case EOK: |
1198 | case EOK: |
1276 | new_node = vfs_node_get(&new_lr); |
1199 | new_node = vfs_node_get(&new_lr); |
1277 | if (!new_node) { |
1200 | if (!new_node) { |
1278 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1201 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1279 | ipc_answer_0(rid, ENOMEM); |
1202 | ipc_answer_0(rid, ENOMEM); |
1280 | free(old); |
1203 | free(old); |
1281 | free(new); |
1204 | free(new); |
1282 | return; |
1205 | return; |
1283 | } |
1206 | } |
1284 | fibril_mutex_lock(&nodes_mutex); |
1207 | fibril_mutex_lock(&nodes_mutex); |
1285 | new_node->lnkcnt--; |
1208 | new_node->lnkcnt--; |
1286 | fibril_mutex_unlock(&nodes_mutex); |
1209 | fibril_mutex_unlock(&nodes_mutex); |
1287 | break; |
1210 | break; |
1288 | default: |
1211 | default: |
1289 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1212 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1290 | ipc_answer_0(rid, ENOTEMPTY); |
1213 | ipc_answer_0(rid, ENOTEMPTY); |
1291 | free(old); |
1214 | free(old); |
1292 | free(new); |
1215 | free(new); |
1293 | return; |
1216 | return; |
1294 | } |
1217 | } |
1295 | /* Create the new link for the new name. */ |
1218 | /* Create the new link for the new name. */ |
1296 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
1219 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
1297 | if (rc != EOK) { |
1220 | if (rc != EOK) { |
1298 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1221 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1299 | if (new_node) |
1222 | if (new_node) |
1300 | vfs_node_put(new_node); |
1223 | vfs_node_put(new_node); |
1301 | ipc_answer_0(rid, rc); |
1224 | ipc_answer_0(rid, rc); |
1302 | free(old); |
1225 | free(old); |
1303 | free(new); |
1226 | free(new); |
1304 | return; |
1227 | return; |
1305 | } |
1228 | } |
1306 | fibril_mutex_lock(&nodes_mutex); |
1229 | fibril_mutex_lock(&nodes_mutex); |
1307 | old_node->lnkcnt++; |
1230 | old_node->lnkcnt++; |
1308 | fibril_mutex_unlock(&nodes_mutex); |
1231 | fibril_mutex_unlock(&nodes_mutex); |
1309 | /* Destroy the link for the old name. */ |
1232 | /* Destroy the link for the old name. */ |
1310 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
1233 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
1311 | if (rc != EOK) { |
1234 | if (rc != EOK) { |
1312 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1235 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1313 | vfs_node_put(old_node); |
1236 | vfs_node_put(old_node); |
1314 | if (new_node) |
1237 | if (new_node) |
1315 | vfs_node_put(new_node); |
1238 | vfs_node_put(new_node); |
1316 | ipc_answer_0(rid, rc); |
1239 | ipc_answer_0(rid, rc); |
1317 | free(old); |
1240 | free(old); |
1318 | free(new); |
1241 | free(new); |
1319 | return; |
1242 | return; |
1320 | } |
1243 | } |
1321 | fibril_mutex_lock(&nodes_mutex); |
1244 | fibril_mutex_lock(&nodes_mutex); |
1322 | old_node->lnkcnt--; |
1245 | old_node->lnkcnt--; |
1323 | fibril_mutex_unlock(&nodes_mutex); |
1246 | fibril_mutex_unlock(&nodes_mutex); |
1324 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1247 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1325 | vfs_node_put(old_node); |
1248 | vfs_node_put(old_node); |
1326 | if (new_node) |
1249 | if (new_node) |
1327 | vfs_node_put(new_node); |
1250 | vfs_node_put(new_node); |
1328 | free(old); |
1251 | free(old); |
1329 | free(new); |
1252 | free(new); |
1330 | ipc_answer_0(rid, EOK); |
1253 | ipc_answer_0(rid, EOK); |
1331 | } |
1254 | } |
1332 | 1255 | ||
1333 | /** |
1256 | /** |
1334 | * @} |
1257 | * @} |
1335 | */ |
1258 | */ |
1336 | 1259 |