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