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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 <futex.h> |
46 | #include <futex.h> |
47 | #include <rwlock.h> |
47 | #include <rwlock.h> |
48 | #include <libadt/list.h> |
48 | #include <libadt/list.h> |
49 | #include <unistd.h> |
49 | #include <unistd.h> |
50 | #include <ctype.h> |
50 | #include <ctype.h> |
51 | #include <fcntl.h> |
51 | #include <fcntl.h> |
52 | #include <assert.h> |
52 | #include <assert.h> |
53 | #include <vfs/canonify.h> |
53 | #include <vfs/canonify.h> |
54 | 54 | ||
55 | /* Forward declarations of static functions. */ |
55 | /* Forward declarations of static functions. */ |
56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
57 | 57 | ||
58 | /** |
58 | /** |
59 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
59 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
60 | * concurrent VFS operation which modifies the file system namespace. |
60 | * concurrent VFS operation which modifies the file system namespace. |
61 | */ |
61 | */ |
62 | RWLOCK_INITIALIZE(namespace_rwlock); |
62 | RWLOCK_INITIALIZE(namespace_rwlock); |
63 | 63 | ||
64 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
64 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
65 | vfs_triplet_t rootfs = { |
65 | vfs_pair_t rootfs = { |
66 | .fs_handle = 0, |
66 | .fs_handle = 0, |
67 | .dev_handle = 0, |
67 | .dev_handle = 0 |
68 | .index = 0, |
- | |
69 | }; |
68 | }; |
70 | 69 | ||
71 | static int |
- | |
72 | lookup_root(fs_handle_t fs_handle, dev_handle_t dev_handle, |
- | |
73 | vfs_lookup_res_t *result) |
- | |
74 | { |
- | |
75 | vfs_pair_t altroot = { |
- | |
76 | .fs_handle = fs_handle, |
- | |
77 | .dev_handle = dev_handle, |
- | |
78 | }; |
- | |
79 | - | ||
80 | return vfs_lookup_internal("/", L_DIRECTORY, result, &altroot); |
- | |
81 | } |
- | |
82 | - | ||
83 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
70 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
84 | { |
71 | { |
85 | dev_handle_t dev_handle; |
72 | dev_handle_t dev_handle; |
86 | vfs_node_t *mp_node = NULL; |
73 | vfs_node_t *mp_node = NULL; |
87 | int rc; |
74 | int rc; |
88 | int phone; |
75 | int phone; |
89 | 76 | ||
90 | /* |
77 | /* |
91 | * We expect the library to do the device-name to device-handle |
78 | * We expect the library to do the device-name to device-handle |
92 | * translation for us, thus the device handle will arrive as ARG1 |
79 | * translation for us, thus the device handle will arrive as ARG1 |
93 | * in the request. |
80 | * in the request. |
94 | */ |
81 | */ |
95 | dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
82 | dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
96 | 83 | ||
97 | /* |
84 | /* |
98 | * For now, don't make use of ARG2 and ARG3, but they can be used to |
85 | * For now, don't make use of ARG2 and ARG3, but they can be used to |
99 | * carry mount options in the future. |
86 | * carry mount options in the future. |
100 | */ |
87 | */ |
101 | 88 | ||
102 | ipc_callid_t callid; |
89 | ipc_callid_t callid; |
103 | size_t size; |
90 | size_t size; |
104 | 91 | ||
105 | /* |
92 | /* |
106 | * Now, we expect the client to send us data with the name of the file |
93 | * Now, we expect the client to send us data with the name of the file |
107 | * system. |
94 | * system. |
108 | */ |
95 | */ |
109 | if (!ipc_data_write_receive(&callid, &size)) { |
96 | if (!ipc_data_write_receive(&callid, &size)) { |
110 | ipc_answer_0(callid, EINVAL); |
97 | ipc_answer_0(callid, EINVAL); |
111 | ipc_answer_0(rid, EINVAL); |
98 | ipc_answer_0(rid, EINVAL); |
112 | return; |
99 | return; |
113 | } |
100 | } |
114 | 101 | ||
115 | /* |
102 | /* |
116 | * Don't receive more than is necessary for storing a full file system |
103 | * Don't receive more than is necessary for storing a full file system |
117 | * name. |
104 | * name. |
118 | */ |
105 | */ |
119 | if (size < 1 || size > FS_NAME_MAXLEN) { |
106 | if (size < 1 || size > FS_NAME_MAXLEN) { |
120 | ipc_answer_0(callid, EINVAL); |
107 | ipc_answer_0(callid, EINVAL); |
121 | ipc_answer_0(rid, EINVAL); |
108 | ipc_answer_0(rid, EINVAL); |
122 | return; |
109 | return; |
123 | } |
110 | } |
124 | 111 | ||
125 | /* Deliver the file system name. */ |
112 | /* Deliver the file system name. */ |
126 | char fs_name[FS_NAME_MAXLEN + 1]; |
113 | char fs_name[FS_NAME_MAXLEN + 1]; |
127 | (void) ipc_data_write_finalize(callid, fs_name, size); |
114 | (void) ipc_data_write_finalize(callid, fs_name, size); |
128 | fs_name[size] = '\0'; |
115 | fs_name[size] = '\0'; |
129 | 116 | ||
130 | /* |
117 | /* |
131 | * Check if we know a file system with the same name as is in fs_name. |
118 | * Check if we know a file system with the same name as is in fs_name. |
132 | * This will also give us its file system handle. |
119 | * This will also give us its file system handle. |
133 | */ |
120 | */ |
134 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
121 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
135 | if (!fs_handle) { |
122 | if (!fs_handle) { |
136 | ipc_answer_0(rid, ENOENT); |
123 | ipc_answer_0(rid, ENOENT); |
137 | return; |
124 | return; |
138 | } |
125 | } |
139 | 126 | ||
140 | /* Now, we want the client to send us the mount point. */ |
127 | /* Now, we want the client to send us the mount point. */ |
141 | if (!ipc_data_write_receive(&callid, &size)) { |
128 | if (!ipc_data_write_receive(&callid, &size)) { |
142 | ipc_answer_0(callid, EINVAL); |
129 | ipc_answer_0(callid, EINVAL); |
143 | ipc_answer_0(rid, EINVAL); |
130 | ipc_answer_0(rid, EINVAL); |
144 | return; |
131 | return; |
145 | } |
132 | } |
146 | 133 | ||
147 | /* Check whether size is reasonable wrt. the mount point. */ |
134 | /* Check whether size is reasonable wrt. the mount point. */ |
148 | if (size < 1 || size > MAX_PATH_LEN) { |
135 | if (size < 1 || size > MAX_PATH_LEN) { |
149 | ipc_answer_0(callid, EINVAL); |
136 | ipc_answer_0(callid, EINVAL); |
150 | ipc_answer_0(rid, EINVAL); |
137 | ipc_answer_0(rid, EINVAL); |
151 | return; |
138 | return; |
152 | } |
139 | } |
153 | /* Allocate buffer for the mount point data being received. */ |
140 | /* Allocate buffer for the mount point data being received. */ |
154 | uint8_t *buf; |
141 | uint8_t *buf; |
155 | buf = malloc(size + 1); |
142 | buf = malloc(size + 1); |
156 | if (!buf) { |
143 | if (!buf) { |
157 | ipc_answer_0(callid, ENOMEM); |
144 | ipc_answer_0(callid, ENOMEM); |
158 | ipc_answer_0(rid, ENOMEM); |
145 | ipc_answer_0(rid, ENOMEM); |
159 | return; |
146 | return; |
160 | } |
147 | } |
161 | 148 | ||
162 | /* Deliver the mount point. */ |
149 | /* Deliver the mount point. */ |
163 | (void) ipc_data_write_finalize(callid, buf, size); |
150 | (void) ipc_data_write_finalize(callid, buf, size); |
164 | buf[size] = '\0'; |
151 | buf[size] = '\0'; |
165 | 152 | ||
166 | /* |
- | |
167 | * Lookup the root node of the filesystem being mounted. |
- | |
168 | * In this case, we don't need to take the namespace_futex as the root |
- | |
169 | * node cannot be removed. However, we do take a reference to it so |
- | |
170 | * that we can track how many times it has been mounted. |
- | |
171 | */ |
- | |
172 | vfs_lookup_res_t mr_res; |
- | |
173 | rc = lookup_root(fs_handle, dev_handle, &mr_res); |
- | |
174 | if (rc != EOK) { |
- | |
175 | free(buf); |
- | |
176 | ipc_answer_0(rid, rc); |
- | |
177 | return; |
- | |
178 | } |
- | |
179 | vfs_node_t *mr_node = vfs_node_get(&mr_res); |
- | |
180 | if (!mr_node) { |
- | |
181 | free(buf); |
- | |
182 | ipc_answer_0(rid, ENOMEM); |
- | |
183 | return; |
- | |
184 | } |
- | |
185 | - | ||
186 | /* Finally, we need to resolve the path to the mountpoint. */ |
153 | /* Resolve the path to the mountpoint. */ |
187 | vfs_lookup_res_t mp_res; |
154 | vfs_lookup_res_t mp_res; |
188 | futex_down(&rootfs_futex); |
155 | futex_down(&rootfs_futex); |
189 | if (rootfs.fs_handle) { |
156 | if (rootfs.fs_handle) { |
190 | /* We already have the root FS. */ |
157 | /* We already have the root FS. */ |
191 | rwlock_write_lock(&namespace_rwlock); |
158 | rwlock_write_lock(&namespace_rwlock); |
192 | if ((size == 1) && (buf[0] == '/')) { |
159 | if ((size == 1) && (buf[0] == '/')) { |
193 | /* Trying to mount root FS over root FS */ |
160 | /* Trying to mount root FS over root FS */ |
194 | rwlock_write_unlock(&namespace_rwlock); |
161 | rwlock_write_unlock(&namespace_rwlock); |
195 | futex_up(&rootfs_futex); |
162 | futex_up(&rootfs_futex); |
196 | vfs_node_put(mr_node); |
- | |
197 | free(buf); |
163 | free(buf); |
198 | ipc_answer_0(rid, EBUSY); |
164 | ipc_answer_0(rid, EBUSY); |
199 | return; |
165 | return; |
200 | } |
166 | } |
201 | rc = vfs_lookup_internal(buf, L_DIRECTORY, &mp_res, NULL); |
167 | rc = vfs_lookup_internal(buf, L_DIRECTORY, &mp_res, NULL); |
202 | if (rc != EOK) { |
168 | if (rc != EOK) { |
203 | /* The lookup failed for some reason. */ |
169 | /* The lookup failed for some reason. */ |
204 | rwlock_write_unlock(&namespace_rwlock); |
170 | rwlock_write_unlock(&namespace_rwlock); |
205 | futex_up(&rootfs_futex); |
171 | futex_up(&rootfs_futex); |
206 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
207 | free(buf); |
172 | free(buf); |
208 | ipc_answer_0(rid, rc); |
173 | ipc_answer_0(rid, rc); |
209 | return; |
174 | return; |
210 | } |
175 | } |
211 | mp_node = vfs_node_get(&mp_res); |
176 | mp_node = vfs_node_get(&mp_res); |
212 | if (!mp_node) { |
177 | if (!mp_node) { |
213 | rwlock_write_unlock(&namespace_rwlock); |
178 | rwlock_write_unlock(&namespace_rwlock); |
214 | futex_up(&rootfs_futex); |
179 | futex_up(&rootfs_futex); |
215 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
216 | free(buf); |
180 | free(buf); |
217 | ipc_answer_0(rid, ENOMEM); |
181 | ipc_answer_0(rid, ENOMEM); |
218 | return; |
182 | return; |
219 | } |
183 | } |
220 | /* |
184 | /* |
221 | * Now we hold a reference to mp_node. |
185 | * Now we hold a reference to mp_node. |
222 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
186 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
223 | * This prevents the mount point from being deleted. |
187 | * This prevents the mount point from being deleted. |
224 | */ |
188 | */ |
225 | rwlock_write_unlock(&namespace_rwlock); |
189 | rwlock_write_unlock(&namespace_rwlock); |
226 | } else { |
190 | } else { |
227 | /* We still don't have the root file system mounted. */ |
191 | /* We still don't have the root file system mounted. */ |
228 | if ((size == 1) && (buf[0] == '/')) { |
192 | if ((size == 1) && (buf[0] == '/')) { |
229 | /* |
193 | /* |
230 | * For this simple, but important case, |
194 | * For this simple, but important case, |
231 | * we are almost done. |
195 | * we are almost done. |
232 | */ |
196 | */ |
233 | free(buf); |
197 | free(buf); |
234 | 198 | ||
235 | /* Inform the mount point about the root mount. */ |
199 | /* Tell the mountee that it is being mounted. */ |
236 | phone = vfs_grab_phone(mr_res.triplet.fs_handle); |
200 | phone = vfs_grab_phone(fs_handle); |
237 | rc = async_req_5_0(phone, VFS_MOUNT, |
201 | rc = async_req_1_0(phone, VFS_MOUNTED, |
238 | (ipcarg_t) mr_res.triplet.dev_handle, |
- | |
239 | (ipcarg_t) mr_res.triplet.index, |
- | |
240 | (ipcarg_t) mr_res.triplet.fs_handle, |
- | |
241 | (ipcarg_t) mr_res.triplet.dev_handle, |
202 | (ipcarg_t) dev_handle); |
242 | (ipcarg_t) mr_res.triplet.index); |
- | |
243 | vfs_release_phone(phone); |
203 | vfs_release_phone(phone); |
244 | 204 | ||
245 | if (rc == EOK) |
205 | if (rc == EOK) { |
246 | rootfs = mr_res.triplet; |
206 | rootfs.fs_handle = fs_handle; |
- | 207 | rootfs.dev_handle = dev_handle; |
|
247 | else |
208 | } |
248 | vfs_node_put(mr_node); |
- | |
249 | 209 | ||
250 | futex_up(&rootfs_futex); |
210 | futex_up(&rootfs_futex); |
251 | ipc_answer_0(rid, rc); |
211 | ipc_answer_0(rid, rc); |
252 | return; |
212 | return; |
253 | } else { |
213 | } else { |
254 | /* |
214 | /* |
255 | * We can't resolve this without the root filesystem |
215 | * We can't resolve this without the root filesystem |
256 | * being mounted first. |
216 | * being mounted first. |
257 | */ |
217 | */ |
258 | futex_up(&rootfs_futex); |
218 | futex_up(&rootfs_futex); |
259 | free(buf); |
219 | free(buf); |
260 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
261 | ipc_answer_0(rid, ENOENT); |
220 | ipc_answer_0(rid, ENOENT); |
262 | return; |
221 | return; |
263 | } |
222 | } |
264 | } |
223 | } |
265 | futex_up(&rootfs_futex); |
224 | futex_up(&rootfs_futex); |
266 | 225 | ||
267 | free(buf); /* The buffer is not needed anymore. */ |
226 | free(buf); /* The buffer is not needed anymore. */ |
268 | 227 | ||
269 | /* |
228 | /* |
270 | * At this point, we have all necessary pieces: file system and device |
229 | * At this point, we have all necessary pieces: file system and device |
271 | * handles, and we know the mount point VFS node and also the root node |
230 | * handles, and we know the mount point VFS node. |
272 | * of the file system being mounted. |
- | |
273 | */ |
231 | */ |
274 | 232 | ||
275 | /** |
- | |
276 | * @todo |
- | |
277 | * Add more IPC parameters so that we can send mount mode/flags. |
- | |
278 | */ |
- | |
279 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
233 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
280 | rc = async_req_5_0(phone, VFS_MOUNT, |
234 | rc = async_req_4_0(phone, VFS_MOUNT, |
281 | (ipcarg_t) mp_res.triplet.dev_handle, |
235 | (ipcarg_t) mp_res.triplet.dev_handle, |
282 | (ipcarg_t) mp_res.triplet.index, |
236 | (ipcarg_t) mp_res.triplet.index, |
283 | (ipcarg_t) mr_res.triplet.fs_handle, |
237 | (ipcarg_t) fs_handle, |
284 | (ipcarg_t) mr_res.triplet.dev_handle, |
238 | (ipcarg_t) dev_handle); |
285 | (ipcarg_t) mr_res.triplet.index); |
- | |
286 | vfs_release_phone(phone); |
239 | vfs_release_phone(phone); |
287 | 240 | ||
288 | if (rc != EOK) { |
241 | if (rc != EOK) { |
289 | /* Mount failed, drop references to mr_node and mp_node. */ |
242 | /* Mount failed, drop reference to mp_node. */ |
290 | vfs_node_put(mr_node); |
- | |
291 | if (mp_node) |
243 | if (mp_node) |
292 | vfs_node_put(mp_node); |
244 | vfs_node_put(mp_node); |
293 | } |
245 | } |
294 | 246 | ||
295 | ipc_answer_0(rid, rc); |
247 | ipc_answer_0(rid, rc); |
296 | } |
248 | } |
297 | 249 | ||
298 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
250 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
299 | { |
251 | { |
300 | if (!vfs_files_init()) { |
252 | if (!vfs_files_init()) { |
301 | ipc_answer_0(rid, ENOMEM); |
253 | ipc_answer_0(rid, ENOMEM); |
302 | return; |
254 | return; |
303 | } |
255 | } |
304 | 256 | ||
305 | /* |
257 | /* |
306 | * The POSIX interface is open(path, oflag, mode). |
258 | * The POSIX interface is open(path, oflag, mode). |
307 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
259 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
308 | * will need to arrive in another call. |
260 | * will need to arrive in another call. |
309 | * |
261 | * |
310 | * We also receive one private, non-POSIX set of flags called lflag |
262 | * We also receive one private, non-POSIX set of flags called lflag |
311 | * used to pass information to vfs_lookup_internal(). |
263 | * used to pass information to vfs_lookup_internal(). |
312 | */ |
264 | */ |
313 | int lflag = IPC_GET_ARG1(*request); |
265 | int lflag = IPC_GET_ARG1(*request); |
314 | int oflag = IPC_GET_ARG2(*request); |
266 | int oflag = IPC_GET_ARG2(*request); |
315 | int mode = IPC_GET_ARG3(*request); |
267 | int mode = IPC_GET_ARG3(*request); |
316 | size_t len; |
268 | size_t len; |
317 | 269 | ||
318 | if (oflag & O_CREAT) |
270 | if (oflag & O_CREAT) |
319 | lflag |= L_CREATE; |
271 | lflag |= L_CREATE; |
320 | if (oflag & O_EXCL) |
272 | if (oflag & O_EXCL) |
321 | lflag |= L_EXCLUSIVE; |
273 | lflag |= L_EXCLUSIVE; |
322 | 274 | ||
323 | ipc_callid_t callid; |
275 | ipc_callid_t callid; |
324 | 276 | ||
325 | if (!ipc_data_write_receive(&callid, &len)) { |
277 | if (!ipc_data_write_receive(&callid, &len)) { |
326 | ipc_answer_0(callid, EINVAL); |
278 | ipc_answer_0(callid, EINVAL); |
327 | ipc_answer_0(rid, EINVAL); |
279 | ipc_answer_0(rid, EINVAL); |
328 | return; |
280 | return; |
329 | } |
281 | } |
330 | char *path = malloc(len + 1); |
282 | char *path = malloc(len + 1); |
331 | if (!path) { |
283 | if (!path) { |
332 | ipc_answer_0(callid, ENOMEM); |
284 | ipc_answer_0(callid, ENOMEM); |
333 | ipc_answer_0(rid, ENOMEM); |
285 | ipc_answer_0(rid, ENOMEM); |
334 | return; |
286 | return; |
335 | } |
287 | } |
336 | int rc; |
288 | int rc; |
337 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
289 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
338 | ipc_answer_0(rid, rc); |
290 | ipc_answer_0(rid, rc); |
339 | free(path); |
291 | free(path); |
340 | return; |
292 | return; |
341 | } |
293 | } |
342 | path[len] = '\0'; |
294 | path[len] = '\0'; |
343 | 295 | ||
344 | /* |
296 | /* |
345 | * Avoid the race condition in which the file can be deleted before we |
297 | * Avoid the race condition in which the file can be deleted before we |
346 | * find/create-and-lock the VFS node corresponding to the looked-up |
298 | * find/create-and-lock the VFS node corresponding to the looked-up |
347 | * triplet. |
299 | * triplet. |
348 | */ |
300 | */ |
349 | if (lflag & L_CREATE) |
301 | if (lflag & L_CREATE) |
350 | rwlock_write_lock(&namespace_rwlock); |
302 | rwlock_write_lock(&namespace_rwlock); |
351 | else |
303 | else |
352 | rwlock_read_lock(&namespace_rwlock); |
304 | rwlock_read_lock(&namespace_rwlock); |
353 | 305 | ||
354 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
306 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
355 | vfs_lookup_res_t lr; |
307 | vfs_lookup_res_t lr; |
356 | rc = vfs_lookup_internal(path, lflag, &lr, NULL); |
308 | rc = vfs_lookup_internal(path, lflag, &lr, NULL); |
357 | if (rc) { |
309 | if (rc) { |
358 | if (lflag & L_CREATE) |
310 | if (lflag & L_CREATE) |
359 | rwlock_write_unlock(&namespace_rwlock); |
311 | rwlock_write_unlock(&namespace_rwlock); |
360 | else |
312 | else |
361 | rwlock_read_unlock(&namespace_rwlock); |
313 | rwlock_read_unlock(&namespace_rwlock); |
362 | ipc_answer_0(rid, rc); |
314 | ipc_answer_0(rid, rc); |
363 | free(path); |
315 | free(path); |
364 | return; |
316 | return; |
365 | } |
317 | } |
366 | 318 | ||
367 | /* Path is no longer needed. */ |
319 | /* Path is no longer needed. */ |
368 | free(path); |
320 | free(path); |
369 | 321 | ||
370 | vfs_node_t *node = vfs_node_get(&lr); |
322 | vfs_node_t *node = vfs_node_get(&lr); |
371 | if (lflag & L_CREATE) |
323 | if (lflag & L_CREATE) |
372 | rwlock_write_unlock(&namespace_rwlock); |
324 | rwlock_write_unlock(&namespace_rwlock); |
373 | else |
325 | else |
374 | rwlock_read_unlock(&namespace_rwlock); |
326 | rwlock_read_unlock(&namespace_rwlock); |
375 | 327 | ||
376 | /* Truncate the file if requested and if necessary. */ |
328 | /* Truncate the file if requested and if necessary. */ |
377 | if (oflag & O_TRUNC) { |
329 | if (oflag & O_TRUNC) { |
378 | rwlock_write_lock(&node->contents_rwlock); |
330 | rwlock_write_lock(&node->contents_rwlock); |
379 | if (node->size) { |
331 | if (node->size) { |
380 | rc = vfs_truncate_internal(node->fs_handle, |
332 | rc = vfs_truncate_internal(node->fs_handle, |
381 | node->dev_handle, node->index, 0); |
333 | node->dev_handle, node->index, 0); |
382 | if (rc) { |
334 | if (rc) { |
383 | rwlock_write_unlock(&node->contents_rwlock); |
335 | rwlock_write_unlock(&node->contents_rwlock); |
384 | vfs_node_put(node); |
336 | vfs_node_put(node); |
385 | ipc_answer_0(rid, rc); |
337 | ipc_answer_0(rid, rc); |
386 | return; |
338 | return; |
387 | } |
339 | } |
388 | node->size = 0; |
340 | node->size = 0; |
389 | } |
341 | } |
390 | rwlock_write_unlock(&node->contents_rwlock); |
342 | rwlock_write_unlock(&node->contents_rwlock); |
391 | } |
343 | } |
392 | 344 | ||
393 | /* |
345 | /* |
394 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
346 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
395 | * structure. |
347 | * structure. |
396 | */ |
348 | */ |
397 | int fd = vfs_fd_alloc(); |
349 | int fd = vfs_fd_alloc(); |
398 | if (fd < 0) { |
350 | if (fd < 0) { |
399 | vfs_node_put(node); |
351 | vfs_node_put(node); |
400 | ipc_answer_0(rid, fd); |
352 | ipc_answer_0(rid, fd); |
401 | return; |
353 | return; |
402 | } |
354 | } |
403 | vfs_file_t *file = vfs_file_get(fd); |
355 | vfs_file_t *file = vfs_file_get(fd); |
404 | file->node = node; |
356 | file->node = node; |
405 | if (oflag & O_APPEND) |
357 | if (oflag & O_APPEND) |
406 | file->append = true; |
358 | file->append = true; |
407 | 359 | ||
408 | /* |
360 | /* |
409 | * The following increase in reference count is for the fact that the |
361 | * The following increase in reference count is for the fact that the |
410 | * file is being opened and that a file structure is pointing to it. |
362 | * file is being opened and that a file structure is pointing to it. |
411 | * It is necessary so that the file will not disappear when |
363 | * It is necessary so that the file will not disappear when |
412 | * vfs_node_put() is called. The reference will be dropped by the |
364 | * vfs_node_put() is called. The reference will be dropped by the |
413 | * respective VFS_CLOSE. |
365 | * respective VFS_CLOSE. |
414 | */ |
366 | */ |
415 | vfs_node_addref(node); |
367 | vfs_node_addref(node); |
416 | vfs_node_put(node); |
368 | vfs_node_put(node); |
417 | 369 | ||
418 | /* Success! Return the new file descriptor to the client. */ |
370 | /* Success! Return the new file descriptor to the client. */ |
419 | ipc_answer_1(rid, EOK, fd); |
371 | ipc_answer_1(rid, EOK, fd); |
420 | } |
372 | } |
421 | 373 | ||
422 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
374 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
423 | { |
375 | { |
424 | int fd = IPC_GET_ARG1(*request); |
376 | int fd = IPC_GET_ARG1(*request); |
425 | if (fd >= MAX_OPEN_FILES) { |
377 | if (fd >= MAX_OPEN_FILES) { |
426 | ipc_answer_0(rid, EBADF); |
378 | ipc_answer_0(rid, EBADF); |
427 | return; |
379 | return; |
428 | } |
380 | } |
429 | vfs_fd_free(fd); |
381 | vfs_fd_free(fd); |
430 | ipc_answer_0(rid, EOK); |
382 | ipc_answer_0(rid, EOK); |
431 | } |
383 | } |
432 | 384 | ||
433 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
385 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
434 | { |
386 | { |
435 | 387 | ||
436 | /* |
388 | /* |
437 | * The following code strongly depends on the fact that the files data |
389 | * The following code strongly depends on the fact that the files data |
438 | * structure can be only accessed by a single fibril and all file |
390 | * structure can be only accessed by a single fibril and all file |
439 | * operations are serialized (i.e. the reads and writes cannot |
391 | * operations are serialized (i.e. the reads and writes cannot |
440 | * interleave and a file cannot be closed while it is being read). |
392 | * interleave and a file cannot be closed while it is being read). |
441 | * |
393 | * |
442 | * Additional synchronization needs to be added once the table of |
394 | * Additional synchronization needs to be added once the table of |
443 | * open files supports parallel access! |
395 | * open files supports parallel access! |
444 | */ |
396 | */ |
445 | 397 | ||
446 | int fd = IPC_GET_ARG1(*request); |
398 | int fd = IPC_GET_ARG1(*request); |
447 | 399 | ||
448 | /* Lookup the file structure corresponding to the file descriptor. */ |
400 | /* Lookup the file structure corresponding to the file descriptor. */ |
449 | vfs_file_t *file = vfs_file_get(fd); |
401 | vfs_file_t *file = vfs_file_get(fd); |
450 | if (!file) { |
402 | if (!file) { |
451 | ipc_answer_0(rid, ENOENT); |
403 | ipc_answer_0(rid, ENOENT); |
452 | return; |
404 | return; |
453 | } |
405 | } |
454 | 406 | ||
455 | /* |
407 | /* |
456 | * Now we need to receive a call with client's |
408 | * Now we need to receive a call with client's |
457 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
409 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
458 | */ |
410 | */ |
459 | ipc_callid_t callid; |
411 | ipc_callid_t callid; |
460 | int res; |
412 | int res; |
461 | if (read) |
413 | if (read) |
462 | res = ipc_data_read_receive(&callid, NULL); |
414 | res = ipc_data_read_receive(&callid, NULL); |
463 | else |
415 | else |
464 | res = ipc_data_write_receive(&callid, NULL); |
416 | res = ipc_data_write_receive(&callid, NULL); |
465 | if (!res) { |
417 | if (!res) { |
466 | ipc_answer_0(callid, EINVAL); |
418 | ipc_answer_0(callid, EINVAL); |
467 | ipc_answer_0(rid, EINVAL); |
419 | ipc_answer_0(rid, EINVAL); |
468 | return; |
420 | return; |
469 | } |
421 | } |
470 | 422 | ||
471 | /* |
423 | /* |
472 | * Lock the open file structure so that no other thread can manipulate |
424 | * Lock the open file structure so that no other thread can manipulate |
473 | * the same open file at a time. |
425 | * the same open file at a time. |
474 | */ |
426 | */ |
475 | futex_down(&file->lock); |
427 | futex_down(&file->lock); |
476 | 428 | ||
477 | /* |
429 | /* |
478 | * Lock the file's node so that no other client can read/write to it at |
430 | * Lock the file's node so that no other client can read/write to it at |
479 | * the same time. |
431 | * the same time. |
480 | */ |
432 | */ |
481 | if (read) |
433 | if (read) |
482 | rwlock_read_lock(&file->node->contents_rwlock); |
434 | rwlock_read_lock(&file->node->contents_rwlock); |
483 | else |
435 | else |
484 | rwlock_write_lock(&file->node->contents_rwlock); |
436 | rwlock_write_lock(&file->node->contents_rwlock); |
485 | 437 | ||
486 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
438 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
487 | 439 | ||
488 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
440 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
489 | aid_t msg; |
441 | aid_t msg; |
490 | ipc_call_t answer; |
442 | ipc_call_t answer; |
491 | if (!read && file->append) |
443 | if (!read && file->append) |
492 | file->pos = file->node->size; |
444 | file->pos = file->node->size; |
493 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
445 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
494 | file->node->dev_handle, file->node->index, file->pos, &answer); |
446 | file->node->dev_handle, file->node->index, file->pos, &answer); |
495 | 447 | ||
496 | /* |
448 | /* |
497 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
449 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
498 | * destination FS server. The call will be routed as if sent by |
450 | * destination FS server. The call will be routed as if sent by |
499 | * ourselves. Note that call arguments are immutable in this case so we |
451 | * ourselves. Note that call arguments are immutable in this case so we |
500 | * don't have to bother. |
452 | * don't have to bother. |
501 | */ |
453 | */ |
502 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
454 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
503 | 455 | ||
504 | vfs_release_phone(fs_phone); |
456 | vfs_release_phone(fs_phone); |
505 | 457 | ||
506 | /* Wait for reply from the FS server. */ |
458 | /* Wait for reply from the FS server. */ |
507 | ipcarg_t rc; |
459 | ipcarg_t rc; |
508 | async_wait_for(msg, &rc); |
460 | async_wait_for(msg, &rc); |
509 | size_t bytes = IPC_GET_ARG1(answer); |
461 | size_t bytes = IPC_GET_ARG1(answer); |
510 | 462 | ||
511 | /* Unlock the VFS node. */ |
463 | /* Unlock the VFS node. */ |
512 | if (read) |
464 | if (read) |
513 | rwlock_read_unlock(&file->node->contents_rwlock); |
465 | rwlock_read_unlock(&file->node->contents_rwlock); |
514 | else { |
466 | else { |
515 | /* Update the cached version of node's size. */ |
467 | /* Update the cached version of node's size. */ |
516 | if (rc == EOK) |
468 | if (rc == EOK) |
517 | file->node->size = IPC_GET_ARG2(answer); |
469 | file->node->size = IPC_GET_ARG2(answer); |
518 | rwlock_write_unlock(&file->node->contents_rwlock); |
470 | rwlock_write_unlock(&file->node->contents_rwlock); |
519 | } |
471 | } |
520 | 472 | ||
521 | /* Update the position pointer and unlock the open file. */ |
473 | /* Update the position pointer and unlock the open file. */ |
522 | if (rc == EOK) |
474 | if (rc == EOK) |
523 | file->pos += bytes; |
475 | file->pos += bytes; |
524 | futex_up(&file->lock); |
476 | futex_up(&file->lock); |
525 | 477 | ||
526 | /* |
478 | /* |
527 | * FS server's reply is the final result of the whole operation we |
479 | * FS server's reply is the final result of the whole operation we |
528 | * return to the client. |
480 | * return to the client. |
529 | */ |
481 | */ |
530 | ipc_answer_1(rid, rc, bytes); |
482 | ipc_answer_1(rid, rc, bytes); |
531 | } |
483 | } |
532 | 484 | ||
533 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
485 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
534 | { |
486 | { |
535 | vfs_rdwr(rid, request, true); |
487 | vfs_rdwr(rid, request, true); |
536 | } |
488 | } |
537 | 489 | ||
538 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
490 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
539 | { |
491 | { |
540 | vfs_rdwr(rid, request, false); |
492 | vfs_rdwr(rid, request, false); |
541 | } |
493 | } |
542 | 494 | ||
543 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
495 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
544 | { |
496 | { |
545 | int fd = (int) IPC_GET_ARG1(*request); |
497 | int fd = (int) IPC_GET_ARG1(*request); |
546 | off_t off = (off_t) IPC_GET_ARG2(*request); |
498 | off_t off = (off_t) IPC_GET_ARG2(*request); |
547 | int whence = (int) IPC_GET_ARG3(*request); |
499 | int whence = (int) IPC_GET_ARG3(*request); |
548 | 500 | ||
549 | 501 | ||
550 | /* Lookup the file structure corresponding to the file descriptor. */ |
502 | /* Lookup the file structure corresponding to the file descriptor. */ |
551 | vfs_file_t *file = vfs_file_get(fd); |
503 | vfs_file_t *file = vfs_file_get(fd); |
552 | if (!file) { |
504 | if (!file) { |
553 | ipc_answer_0(rid, ENOENT); |
505 | ipc_answer_0(rid, ENOENT); |
554 | return; |
506 | return; |
555 | } |
507 | } |
556 | 508 | ||
557 | off_t newpos; |
509 | off_t newpos; |
558 | futex_down(&file->lock); |
510 | futex_down(&file->lock); |
559 | if (whence == SEEK_SET) { |
511 | if (whence == SEEK_SET) { |
560 | file->pos = off; |
512 | file->pos = off; |
561 | futex_up(&file->lock); |
513 | futex_up(&file->lock); |
562 | ipc_answer_1(rid, EOK, off); |
514 | ipc_answer_1(rid, EOK, off); |
563 | return; |
515 | return; |
564 | } |
516 | } |
565 | if (whence == SEEK_CUR) { |
517 | if (whence == SEEK_CUR) { |
566 | if (file->pos + off < file->pos) { |
518 | if (file->pos + off < file->pos) { |
567 | futex_up(&file->lock); |
519 | futex_up(&file->lock); |
568 | ipc_answer_0(rid, EOVERFLOW); |
520 | ipc_answer_0(rid, EOVERFLOW); |
569 | return; |
521 | return; |
570 | } |
522 | } |
571 | file->pos += off; |
523 | file->pos += off; |
572 | newpos = file->pos; |
524 | newpos = file->pos; |
573 | futex_up(&file->lock); |
525 | futex_up(&file->lock); |
574 | ipc_answer_1(rid, EOK, newpos); |
526 | ipc_answer_1(rid, EOK, newpos); |
575 | return; |
527 | return; |
576 | } |
528 | } |
577 | if (whence == SEEK_END) { |
529 | if (whence == SEEK_END) { |
578 | rwlock_read_lock(&file->node->contents_rwlock); |
530 | rwlock_read_lock(&file->node->contents_rwlock); |
579 | size_t size = file->node->size; |
531 | size_t size = file->node->size; |
580 | rwlock_read_unlock(&file->node->contents_rwlock); |
532 | rwlock_read_unlock(&file->node->contents_rwlock); |
581 | if (size + off < size) { |
533 | if (size + off < size) { |
582 | futex_up(&file->lock); |
534 | futex_up(&file->lock); |
583 | ipc_answer_0(rid, EOVERFLOW); |
535 | ipc_answer_0(rid, EOVERFLOW); |
584 | return; |
536 | return; |
585 | } |
537 | } |
586 | newpos = size + off; |
538 | newpos = size + off; |
587 | futex_up(&file->lock); |
539 | futex_up(&file->lock); |
588 | ipc_answer_1(rid, EOK, newpos); |
540 | ipc_answer_1(rid, EOK, newpos); |
589 | return; |
541 | return; |
590 | } |
542 | } |
591 | futex_up(&file->lock); |
543 | futex_up(&file->lock); |
592 | ipc_answer_0(rid, EINVAL); |
544 | ipc_answer_0(rid, EINVAL); |
593 | } |
545 | } |
594 | 546 | ||
595 | int |
547 | int |
596 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
548 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
597 | fs_index_t index, size_t size) |
549 | fs_index_t index, size_t size) |
598 | { |
550 | { |
599 | ipcarg_t rc; |
551 | ipcarg_t rc; |
600 | int fs_phone; |
552 | int fs_phone; |
601 | 553 | ||
602 | fs_phone = vfs_grab_phone(fs_handle); |
554 | fs_phone = vfs_grab_phone(fs_handle); |
603 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
555 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
604 | (ipcarg_t)index, (ipcarg_t)size); |
556 | (ipcarg_t)index, (ipcarg_t)size); |
605 | vfs_release_phone(fs_phone); |
557 | vfs_release_phone(fs_phone); |
606 | return (int)rc; |
558 | return (int)rc; |
607 | } |
559 | } |
608 | 560 | ||
609 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
561 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
610 | { |
562 | { |
611 | int fd = IPC_GET_ARG1(*request); |
563 | int fd = IPC_GET_ARG1(*request); |
612 | size_t size = IPC_GET_ARG2(*request); |
564 | size_t size = IPC_GET_ARG2(*request); |
613 | int rc; |
565 | int rc; |
614 | 566 | ||
615 | vfs_file_t *file = vfs_file_get(fd); |
567 | vfs_file_t *file = vfs_file_get(fd); |
616 | if (!file) { |
568 | if (!file) { |
617 | ipc_answer_0(rid, ENOENT); |
569 | ipc_answer_0(rid, ENOENT); |
618 | return; |
570 | return; |
619 | } |
571 | } |
620 | futex_down(&file->lock); |
572 | futex_down(&file->lock); |
621 | 573 | ||
622 | rwlock_write_lock(&file->node->contents_rwlock); |
574 | rwlock_write_lock(&file->node->contents_rwlock); |
623 | rc = vfs_truncate_internal(file->node->fs_handle, |
575 | rc = vfs_truncate_internal(file->node->fs_handle, |
624 | file->node->dev_handle, file->node->index, size); |
576 | file->node->dev_handle, file->node->index, size); |
625 | if (rc == EOK) |
577 | if (rc == EOK) |
626 | file->node->size = size; |
578 | file->node->size = size; |
627 | rwlock_write_unlock(&file->node->contents_rwlock); |
579 | rwlock_write_unlock(&file->node->contents_rwlock); |
628 | 580 | ||
629 | futex_up(&file->lock); |
581 | futex_up(&file->lock); |
630 | ipc_answer_0(rid, (ipcarg_t)rc); |
582 | ipc_answer_0(rid, (ipcarg_t)rc); |
631 | } |
583 | } |
632 | 584 | ||
633 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
585 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
634 | { |
586 | { |
635 | int mode = IPC_GET_ARG1(*request); |
587 | int mode = IPC_GET_ARG1(*request); |
636 | 588 | ||
637 | size_t len; |
589 | size_t len; |
638 | ipc_callid_t callid; |
590 | ipc_callid_t callid; |
639 | 591 | ||
640 | if (!ipc_data_write_receive(&callid, &len)) { |
592 | if (!ipc_data_write_receive(&callid, &len)) { |
641 | ipc_answer_0(callid, EINVAL); |
593 | ipc_answer_0(callid, EINVAL); |
642 | ipc_answer_0(rid, EINVAL); |
594 | ipc_answer_0(rid, EINVAL); |
643 | return; |
595 | return; |
644 | } |
596 | } |
645 | char *path = malloc(len + 1); |
597 | char *path = malloc(len + 1); |
646 | if (!path) { |
598 | if (!path) { |
647 | ipc_answer_0(callid, ENOMEM); |
599 | ipc_answer_0(callid, ENOMEM); |
648 | ipc_answer_0(rid, ENOMEM); |
600 | ipc_answer_0(rid, ENOMEM); |
649 | return; |
601 | return; |
650 | } |
602 | } |
651 | int rc; |
603 | int rc; |
652 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
604 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
653 | ipc_answer_0(rid, rc); |
605 | ipc_answer_0(rid, rc); |
654 | free(path); |
606 | free(path); |
655 | return; |
607 | return; |
656 | } |
608 | } |
657 | path[len] = '\0'; |
609 | path[len] = '\0'; |
658 | 610 | ||
659 | rwlock_write_lock(&namespace_rwlock); |
611 | rwlock_write_lock(&namespace_rwlock); |
660 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
612 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
661 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
613 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
662 | rwlock_write_unlock(&namespace_rwlock); |
614 | rwlock_write_unlock(&namespace_rwlock); |
663 | free(path); |
615 | free(path); |
664 | ipc_answer_0(rid, rc); |
616 | ipc_answer_0(rid, rc); |
665 | } |
617 | } |
666 | 618 | ||
667 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
619 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
668 | { |
620 | { |
669 | int lflag = IPC_GET_ARG1(*request); |
621 | int lflag = IPC_GET_ARG1(*request); |
670 | 622 | ||
671 | size_t len; |
623 | size_t len; |
672 | ipc_callid_t callid; |
624 | ipc_callid_t callid; |
673 | 625 | ||
674 | if (!ipc_data_write_receive(&callid, &len)) { |
626 | if (!ipc_data_write_receive(&callid, &len)) { |
675 | ipc_answer_0(callid, EINVAL); |
627 | ipc_answer_0(callid, EINVAL); |
676 | ipc_answer_0(rid, EINVAL); |
628 | ipc_answer_0(rid, EINVAL); |
677 | return; |
629 | return; |
678 | } |
630 | } |
679 | char *path = malloc(len + 1); |
631 | char *path = malloc(len + 1); |
680 | if (!path) { |
632 | if (!path) { |
681 | ipc_answer_0(callid, ENOMEM); |
633 | ipc_answer_0(callid, ENOMEM); |
682 | ipc_answer_0(rid, ENOMEM); |
634 | ipc_answer_0(rid, ENOMEM); |
683 | return; |
635 | return; |
684 | } |
636 | } |
685 | int rc; |
637 | int rc; |
686 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
638 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
687 | ipc_answer_0(rid, rc); |
639 | ipc_answer_0(rid, rc); |
688 | free(path); |
640 | free(path); |
689 | return; |
641 | return; |
690 | } |
642 | } |
691 | path[len] = '\0'; |
643 | path[len] = '\0'; |
692 | 644 | ||
693 | rwlock_write_lock(&namespace_rwlock); |
645 | rwlock_write_lock(&namespace_rwlock); |
694 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
646 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
695 | vfs_lookup_res_t lr; |
647 | vfs_lookup_res_t lr; |
696 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
648 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
697 | free(path); |
649 | free(path); |
698 | if (rc != EOK) { |
650 | if (rc != EOK) { |
699 | rwlock_write_unlock(&namespace_rwlock); |
651 | rwlock_write_unlock(&namespace_rwlock); |
700 | ipc_answer_0(rid, rc); |
652 | ipc_answer_0(rid, rc); |
701 | return; |
653 | return; |
702 | } |
654 | } |
703 | 655 | ||
704 | /* |
656 | /* |
705 | * The name has already been unlinked by vfs_lookup_internal(). |
657 | * The name has already been unlinked by vfs_lookup_internal(). |
706 | * We have to get and put the VFS node to ensure that it is |
658 | * We have to get and put the VFS node to ensure that it is |
707 | * VFS_DESTROY'ed after the last reference to it is dropped. |
659 | * VFS_DESTROY'ed after the last reference to it is dropped. |
708 | */ |
660 | */ |
709 | vfs_node_t *node = vfs_node_get(&lr); |
661 | vfs_node_t *node = vfs_node_get(&lr); |
710 | futex_down(&nodes_futex); |
662 | futex_down(&nodes_futex); |
711 | node->lnkcnt--; |
663 | node->lnkcnt--; |
712 | futex_up(&nodes_futex); |
664 | futex_up(&nodes_futex); |
713 | rwlock_write_unlock(&namespace_rwlock); |
665 | rwlock_write_unlock(&namespace_rwlock); |
714 | vfs_node_put(node); |
666 | vfs_node_put(node); |
715 | ipc_answer_0(rid, EOK); |
667 | ipc_answer_0(rid, EOK); |
716 | } |
668 | } |
717 | 669 | ||
718 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
670 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
719 | { |
671 | { |
720 | size_t len; |
672 | size_t len; |
721 | ipc_callid_t callid; |
673 | ipc_callid_t callid; |
722 | int rc; |
674 | int rc; |
723 | 675 | ||
724 | /* Retrieve the old path. */ |
676 | /* Retrieve the old path. */ |
725 | if (!ipc_data_write_receive(&callid, &len)) { |
677 | if (!ipc_data_write_receive(&callid, &len)) { |
726 | ipc_answer_0(callid, EINVAL); |
678 | ipc_answer_0(callid, EINVAL); |
727 | ipc_answer_0(rid, EINVAL); |
679 | ipc_answer_0(rid, EINVAL); |
728 | return; |
680 | return; |
729 | } |
681 | } |
730 | char *old = malloc(len + 1); |
682 | char *old = malloc(len + 1); |
731 | if (!old) { |
683 | if (!old) { |
732 | ipc_answer_0(callid, ENOMEM); |
684 | ipc_answer_0(callid, ENOMEM); |
733 | ipc_answer_0(rid, ENOMEM); |
685 | ipc_answer_0(rid, ENOMEM); |
734 | return; |
686 | return; |
735 | } |
687 | } |
736 | if ((rc = ipc_data_write_finalize(callid, old, len))) { |
688 | if ((rc = ipc_data_write_finalize(callid, old, len))) { |
737 | ipc_answer_0(rid, rc); |
689 | ipc_answer_0(rid, rc); |
738 | free(old); |
690 | free(old); |
739 | return; |
691 | return; |
740 | } |
692 | } |
741 | old[len] = '\0'; |
693 | old[len] = '\0'; |
742 | 694 | ||
743 | /* Retrieve the new path. */ |
695 | /* Retrieve the new path. */ |
744 | if (!ipc_data_write_receive(&callid, &len)) { |
696 | if (!ipc_data_write_receive(&callid, &len)) { |
745 | ipc_answer_0(callid, EINVAL); |
697 | ipc_answer_0(callid, EINVAL); |
746 | ipc_answer_0(rid, EINVAL); |
698 | ipc_answer_0(rid, EINVAL); |
747 | free(old); |
699 | free(old); |
748 | return; |
700 | return; |
749 | } |
701 | } |
750 | char *new = malloc(len + 1); |
702 | char *new = malloc(len + 1); |
751 | if (!new) { |
703 | if (!new) { |
752 | ipc_answer_0(callid, ENOMEM); |
704 | ipc_answer_0(callid, ENOMEM); |
753 | ipc_answer_0(rid, ENOMEM); |
705 | ipc_answer_0(rid, ENOMEM); |
754 | free(old); |
706 | free(old); |
755 | return; |
707 | return; |
756 | } |
708 | } |
757 | if ((rc = ipc_data_write_finalize(callid, new, len))) { |
709 | if ((rc = ipc_data_write_finalize(callid, new, len))) { |
758 | ipc_answer_0(rid, rc); |
710 | ipc_answer_0(rid, rc); |
759 | free(old); |
711 | free(old); |
760 | free(new); |
712 | free(new); |
761 | return; |
713 | return; |
762 | } |
714 | } |
763 | new[len] = '\0'; |
715 | new[len] = '\0'; |
764 | 716 | ||
765 | char *oldc = canonify(old, &len); |
717 | char *oldc = canonify(old, &len); |
766 | char *newc = canonify(new, NULL); |
718 | char *newc = canonify(new, NULL); |
767 | if (!oldc || !newc) { |
719 | if (!oldc || !newc) { |
768 | ipc_answer_0(rid, EINVAL); |
720 | ipc_answer_0(rid, EINVAL); |
769 | free(old); |
721 | free(old); |
770 | free(new); |
722 | free(new); |
771 | return; |
723 | return; |
772 | } |
724 | } |
773 | if (!strncmp(newc, oldc, len)) { |
725 | if (!strncmp(newc, oldc, len)) { |
774 | /* oldc is a prefix of newc */ |
726 | /* oldc is a prefix of newc */ |
775 | ipc_answer_0(rid, EINVAL); |
727 | ipc_answer_0(rid, EINVAL); |
776 | free(old); |
728 | free(old); |
777 | free(new); |
729 | free(new); |
778 | return; |
730 | return; |
779 | } |
731 | } |
780 | 732 | ||
781 | vfs_lookup_res_t old_lr; |
733 | vfs_lookup_res_t old_lr; |
782 | vfs_lookup_res_t new_lr; |
734 | vfs_lookup_res_t new_lr; |
783 | vfs_lookup_res_t new_par_lr; |
735 | vfs_lookup_res_t new_par_lr; |
784 | rwlock_write_lock(&namespace_rwlock); |
736 | rwlock_write_lock(&namespace_rwlock); |
785 | /* Lookup the node belonging to the old file name. */ |
737 | /* Lookup the node belonging to the old file name. */ |
786 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
738 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
787 | if (rc != EOK) { |
739 | if (rc != EOK) { |
788 | rwlock_write_unlock(&namespace_rwlock); |
740 | rwlock_write_unlock(&namespace_rwlock); |
789 | ipc_answer_0(rid, rc); |
741 | ipc_answer_0(rid, rc); |
790 | free(old); |
742 | free(old); |
791 | free(new); |
743 | free(new); |
792 | return; |
744 | return; |
793 | } |
745 | } |
794 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
746 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
795 | if (!old_node) { |
747 | if (!old_node) { |
796 | rwlock_write_unlock(&namespace_rwlock); |
748 | rwlock_write_unlock(&namespace_rwlock); |
797 | ipc_answer_0(rid, ENOMEM); |
749 | ipc_answer_0(rid, ENOMEM); |
798 | free(old); |
750 | free(old); |
799 | free(new); |
751 | free(new); |
800 | return; |
752 | return; |
801 | } |
753 | } |
802 | /* Lookup parent of the new file name. */ |
754 | /* Lookup parent of the new file name. */ |
803 | rc = vfs_lookup_internal(newc, L_PARENT, &new_par_lr, NULL); |
755 | rc = vfs_lookup_internal(newc, L_PARENT, &new_par_lr, NULL); |
804 | if (rc != EOK) { |
756 | if (rc != EOK) { |
805 | rwlock_write_unlock(&namespace_rwlock); |
757 | rwlock_write_unlock(&namespace_rwlock); |
806 | ipc_answer_0(rid, rc); |
758 | ipc_answer_0(rid, rc); |
807 | free(old); |
759 | free(old); |
808 | free(new); |
760 | free(new); |
809 | return; |
761 | return; |
810 | } |
762 | } |
811 | /* Check whether linking to the same file system instance. */ |
763 | /* Check whether linking to the same file system instance. */ |
812 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
764 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
813 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
765 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
814 | rwlock_write_unlock(&namespace_rwlock); |
766 | rwlock_write_unlock(&namespace_rwlock); |
815 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
767 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
816 | free(old); |
768 | free(old); |
817 | free(new); |
769 | free(new); |
818 | return; |
770 | return; |
819 | } |
771 | } |
820 | /* Destroy the old link for the new name. */ |
772 | /* Destroy the old link for the new name. */ |
821 | vfs_node_t *new_node = NULL; |
773 | vfs_node_t *new_node = NULL; |
822 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
774 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
823 | switch (rc) { |
775 | switch (rc) { |
824 | case ENOENT: |
776 | case ENOENT: |
825 | /* simply not in our way */ |
777 | /* simply not in our way */ |
826 | break; |
778 | break; |
827 | case EOK: |
779 | case EOK: |
828 | new_node = vfs_node_get(&new_lr); |
780 | new_node = vfs_node_get(&new_lr); |
829 | if (!new_node) { |
781 | if (!new_node) { |
830 | rwlock_write_unlock(&namespace_rwlock); |
782 | rwlock_write_unlock(&namespace_rwlock); |
831 | ipc_answer_0(rid, ENOMEM); |
783 | ipc_answer_0(rid, ENOMEM); |
832 | free(old); |
784 | free(old); |
833 | free(new); |
785 | free(new); |
834 | return; |
786 | return; |
835 | } |
787 | } |
836 | futex_down(&nodes_futex); |
788 | futex_down(&nodes_futex); |
837 | new_node->lnkcnt--; |
789 | new_node->lnkcnt--; |
838 | futex_up(&nodes_futex); |
790 | futex_up(&nodes_futex); |
839 | break; |
791 | break; |
840 | default: |
792 | default: |
841 | rwlock_write_unlock(&namespace_rwlock); |
793 | rwlock_write_unlock(&namespace_rwlock); |
842 | ipc_answer_0(rid, ENOTEMPTY); |
794 | ipc_answer_0(rid, ENOTEMPTY); |
843 | free(old); |
795 | free(old); |
844 | free(new); |
796 | free(new); |
845 | return; |
797 | return; |
846 | } |
798 | } |
847 | /* Create the new link for the new name. */ |
799 | /* Create the new link for the new name. */ |
848 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
800 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
849 | if (rc != EOK) { |
801 | if (rc != EOK) { |
850 | rwlock_write_unlock(&namespace_rwlock); |
802 | rwlock_write_unlock(&namespace_rwlock); |
851 | if (new_node) |
803 | if (new_node) |
852 | vfs_node_put(new_node); |
804 | vfs_node_put(new_node); |
853 | ipc_answer_0(rid, rc); |
805 | ipc_answer_0(rid, rc); |
854 | free(old); |
806 | free(old); |
855 | free(new); |
807 | free(new); |
856 | return; |
808 | return; |
857 | } |
809 | } |
858 | futex_down(&nodes_futex); |
810 | futex_down(&nodes_futex); |
859 | old_node->lnkcnt++; |
811 | old_node->lnkcnt++; |
860 | futex_up(&nodes_futex); |
812 | futex_up(&nodes_futex); |
861 | /* Destroy the link for the old name. */ |
813 | /* Destroy the link for the old name. */ |
862 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
814 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
863 | if (rc != EOK) { |
815 | if (rc != EOK) { |
864 | rwlock_write_unlock(&namespace_rwlock); |
816 | rwlock_write_unlock(&namespace_rwlock); |
865 | vfs_node_put(old_node); |
817 | vfs_node_put(old_node); |
866 | if (new_node) |
818 | if (new_node) |
867 | vfs_node_put(new_node); |
819 | vfs_node_put(new_node); |
868 | ipc_answer_0(rid, rc); |
820 | ipc_answer_0(rid, rc); |
869 | free(old); |
821 | free(old); |
870 | free(new); |
822 | free(new); |
871 | return; |
823 | return; |
872 | } |
824 | } |
873 | futex_down(&nodes_futex); |
825 | futex_down(&nodes_futex); |
874 | old_node->lnkcnt--; |
826 | old_node->lnkcnt--; |
875 | futex_up(&nodes_futex); |
827 | futex_up(&nodes_futex); |
876 | rwlock_write_unlock(&namespace_rwlock); |
828 | rwlock_write_unlock(&namespace_rwlock); |
877 | vfs_node_put(old_node); |
829 | vfs_node_put(old_node); |
878 | if (new_node) |
830 | if (new_node) |
879 | vfs_node_put(new_node); |
831 | vfs_node_put(new_node); |
880 | free(old); |
832 | free(old); |
881 | free(new); |
833 | free(new); |
882 | ipc_answer_0(rid, EOK); |
834 | ipc_answer_0(rid, EOK); |
883 | } |
835 | } |
884 | 836 | ||
885 | /** |
837 | /** |
886 | * @} |
838 | * @} |
887 | */ |
839 | */ |
888 | 840 |