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