Rev 4518 | Rev 4539 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 4518 | Rev 4520 | ||
---|---|---|---|
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 <fibril_sync.h> |
47 | #include <fibril_sync.h> |
48 | #include <adt/list.h> |
48 | #include <adt/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 | FIBRIL_MUTEX_INITIALIZE(pending_lock); |
|
69 | LIST_INITIALIZE(pending_req); |
70 | LIST_INITIALIZE(pending_req); |
70 | 71 | ||
71 | /** |
72 | /** |
72 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
73 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
73 | * concurrent VFS operation which modifies the file system namespace. |
74 | * concurrent VFS operation which modifies the file system namespace. |
74 | */ |
75 | */ |
75 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
76 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
76 | 77 | ||
77 | vfs_pair_t rootfs = { |
78 | vfs_pair_t rootfs = { |
78 | .fs_handle = 0, |
79 | .fs_handle = 0, |
79 | .dev_handle = 0 |
80 | .dev_handle = 0 |
80 | }; |
81 | }; |
81 | 82 | ||
82 | 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, |
83 | fs_handle_t fs_handle, char *mp, char *opts) |
84 | fs_handle_t fs_handle, char *mp, char *opts) |
84 | { |
85 | { |
85 | vfs_lookup_res_t mp_res; |
86 | vfs_lookup_res_t mp_res; |
86 | vfs_lookup_res_t mr_res; |
87 | vfs_lookup_res_t mr_res; |
87 | vfs_node_t *mp_node = NULL; |
88 | vfs_node_t *mp_node = NULL; |
88 | vfs_node_t *mr_node; |
89 | vfs_node_t *mr_node; |
89 | fs_index_t rindex; |
90 | fs_index_t rindex; |
90 | size_t rsize; |
91 | size_t rsize; |
91 | unsigned rlnkcnt; |
92 | unsigned rlnkcnt; |
92 | ipcarg_t rc; |
93 | ipcarg_t rc; |
93 | int phone; |
94 | int phone; |
94 | aid_t msg; |
95 | aid_t msg; |
95 | ipc_call_t answer; |
96 | ipc_call_t answer; |
96 | 97 | ||
97 | /* Resolve the path to the mountpoint. */ |
98 | /* Resolve the path to the mountpoint. */ |
98 | fibril_rwlock_write_lock(&namespace_rwlock); |
99 | fibril_rwlock_write_lock(&namespace_rwlock); |
99 | if (rootfs.fs_handle) { |
100 | if (rootfs.fs_handle) { |
100 | /* We already have the root FS. */ |
101 | /* We already have the root FS. */ |
101 | if (str_cmp(mp, "/") == 0) { |
102 | if (str_cmp(mp, "/") == 0) { |
102 | /* Trying to mount root FS over root FS */ |
103 | /* Trying to mount root FS over root FS */ |
103 | fibril_rwlock_write_unlock(&namespace_rwlock); |
104 | fibril_rwlock_write_unlock(&namespace_rwlock); |
104 | ipc_answer_0(rid, EBUSY); |
105 | ipc_answer_0(rid, EBUSY); |
105 | return; |
106 | return; |
106 | } |
107 | } |
107 | 108 | ||
108 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
109 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
109 | if (rc != EOK) { |
110 | if (rc != EOK) { |
110 | /* The lookup failed for some reason. */ |
111 | /* The lookup failed for some reason. */ |
111 | fibril_rwlock_write_unlock(&namespace_rwlock); |
112 | fibril_rwlock_write_unlock(&namespace_rwlock); |
112 | ipc_answer_0(rid, rc); |
113 | ipc_answer_0(rid, rc); |
113 | return; |
114 | return; |
114 | } |
115 | } |
115 | 116 | ||
116 | mp_node = vfs_node_get(&mp_res); |
117 | mp_node = vfs_node_get(&mp_res); |
117 | if (!mp_node) { |
118 | if (!mp_node) { |
118 | fibril_rwlock_write_unlock(&namespace_rwlock); |
119 | fibril_rwlock_write_unlock(&namespace_rwlock); |
119 | ipc_answer_0(rid, ENOMEM); |
120 | ipc_answer_0(rid, ENOMEM); |
120 | return; |
121 | return; |
121 | } |
122 | } |
122 | 123 | ||
123 | /* |
124 | /* |
124 | * Now we hold a reference to mp_node. |
125 | * Now we hold a reference to mp_node. |
125 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
126 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
126 | * This prevents the mount point from being deleted. |
127 | * This prevents the mount point from being deleted. |
127 | */ |
128 | */ |
128 | } else { |
129 | } else { |
129 | /* We still don't have the root file system mounted. */ |
130 | /* We still don't have the root file system mounted. */ |
130 | if (str_cmp(mp, "/") == 0) { |
131 | if (str_cmp(mp, "/") == 0) { |
131 | /* |
132 | /* |
132 | * For this simple, but important case, |
133 | * For this simple, but important case, |
133 | * we are almost done. |
134 | * we are almost done. |
134 | */ |
135 | */ |
135 | 136 | ||
136 | /* Tell the mountee that it is being mounted. */ |
137 | /* Tell the mountee that it is being mounted. */ |
137 | phone = vfs_grab_phone(fs_handle); |
138 | phone = vfs_grab_phone(fs_handle); |
138 | msg = async_send_1(phone, VFS_MOUNTED, |
139 | msg = async_send_1(phone, VFS_MOUNTED, |
139 | (ipcarg_t) dev_handle, &answer); |
140 | (ipcarg_t) dev_handle, &answer); |
140 | /* send the mount options */ |
141 | /* send the mount options */ |
141 | rc = ipc_data_write_start(phone, (void *)opts, |
142 | rc = ipc_data_write_start(phone, (void *)opts, |
142 | str_size(opts)); |
143 | str_size(opts)); |
143 | if (rc != EOK) { |
144 | if (rc != EOK) { |
144 | vfs_release_phone(phone); |
145 | vfs_release_phone(phone); |
145 | async_wait_for(msg, NULL); |
146 | async_wait_for(msg, NULL); |
146 | fibril_rwlock_write_unlock(&namespace_rwlock); |
147 | fibril_rwlock_write_unlock(&namespace_rwlock); |
147 | ipc_answer_0(rid, rc); |
148 | ipc_answer_0(rid, rc); |
148 | return; |
149 | return; |
149 | } |
150 | } |
150 | vfs_release_phone(phone); |
151 | vfs_release_phone(phone); |
151 | async_wait_for(msg, &rc); |
152 | async_wait_for(msg, &rc); |
152 | 153 | ||
153 | if (rc != EOK) { |
154 | if (rc != EOK) { |
154 | fibril_rwlock_write_unlock(&namespace_rwlock); |
155 | fibril_rwlock_write_unlock(&namespace_rwlock); |
155 | ipc_answer_0(rid, rc); |
156 | ipc_answer_0(rid, rc); |
156 | return; |
157 | return; |
157 | } |
158 | } |
158 | 159 | ||
159 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
160 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
160 | rsize = (size_t) IPC_GET_ARG2(answer); |
161 | rsize = (size_t) IPC_GET_ARG2(answer); |
161 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
162 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
162 | 163 | ||
163 | mr_res.triplet.fs_handle = fs_handle; |
164 | mr_res.triplet.fs_handle = fs_handle; |
164 | mr_res.triplet.dev_handle = dev_handle; |
165 | mr_res.triplet.dev_handle = dev_handle; |
165 | mr_res.triplet.index = rindex; |
166 | mr_res.triplet.index = rindex; |
166 | mr_res.size = rsize; |
167 | mr_res.size = rsize; |
167 | mr_res.lnkcnt = rlnkcnt; |
168 | mr_res.lnkcnt = rlnkcnt; |
168 | mr_res.type = VFS_NODE_DIRECTORY; |
169 | mr_res.type = VFS_NODE_DIRECTORY; |
169 | 170 | ||
170 | rootfs.fs_handle = fs_handle; |
171 | rootfs.fs_handle = fs_handle; |
171 | rootfs.dev_handle = dev_handle; |
172 | rootfs.dev_handle = dev_handle; |
172 | 173 | ||
173 | /* Add reference to the mounted root. */ |
174 | /* Add reference to the mounted root. */ |
174 | mr_node = vfs_node_get(&mr_res); |
175 | mr_node = vfs_node_get(&mr_res); |
175 | assert(mr_node); |
176 | assert(mr_node); |
176 | 177 | ||
177 | fibril_rwlock_write_unlock(&namespace_rwlock); |
178 | fibril_rwlock_write_unlock(&namespace_rwlock); |
178 | ipc_answer_0(rid, rc); |
179 | ipc_answer_0(rid, rc); |
179 | return; |
180 | return; |
180 | } else { |
181 | } else { |
181 | /* |
182 | /* |
182 | * We can't resolve this without the root filesystem |
183 | * We can't resolve this without the root filesystem |
183 | * being mounted first. |
184 | * being mounted first. |
184 | */ |
185 | */ |
185 | fibril_rwlock_write_unlock(&namespace_rwlock); |
186 | fibril_rwlock_write_unlock(&namespace_rwlock); |
186 | ipc_answer_0(rid, ENOENT); |
187 | ipc_answer_0(rid, ENOENT); |
187 | return; |
188 | return; |
188 | } |
189 | } |
189 | } |
190 | } |
190 | 191 | ||
191 | /* |
192 | /* |
192 | * At this point, we have all necessary pieces: file system and device |
193 | * At this point, we have all necessary pieces: file system and device |
193 | * handles, and we know the mount point VFS node. |
194 | * handles, and we know the mount point VFS node. |
194 | */ |
195 | */ |
195 | 196 | ||
196 | int mountee_phone = vfs_grab_phone(fs_handle); |
197 | int mountee_phone = vfs_grab_phone(fs_handle); |
197 | assert(mountee_phone >= 0); |
198 | assert(mountee_phone >= 0); |
198 | vfs_release_phone(mountee_phone); |
199 | vfs_release_phone(mountee_phone); |
199 | 200 | ||
200 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
201 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
201 | msg = async_send_4(phone, VFS_MOUNT, |
202 | msg = async_send_4(phone, VFS_MOUNT, |
202 | (ipcarg_t) mp_res.triplet.dev_handle, |
203 | (ipcarg_t) mp_res.triplet.dev_handle, |
203 | (ipcarg_t) mp_res.triplet.index, |
204 | (ipcarg_t) mp_res.triplet.index, |
204 | (ipcarg_t) fs_handle, |
205 | (ipcarg_t) fs_handle, |
205 | (ipcarg_t) dev_handle, &answer); |
206 | (ipcarg_t) dev_handle, &answer); |
206 | 207 | ||
207 | /* send connection */ |
208 | /* send connection */ |
208 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
209 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
209 | if (rc != EOK) { |
210 | if (rc != EOK) { |
210 | vfs_release_phone(phone); |
211 | vfs_release_phone(phone); |
211 | async_wait_for(msg, NULL); |
212 | async_wait_for(msg, NULL); |
212 | /* Mount failed, drop reference to mp_node. */ |
213 | /* Mount failed, drop reference to mp_node. */ |
213 | if (mp_node) |
214 | if (mp_node) |
214 | vfs_node_put(mp_node); |
215 | vfs_node_put(mp_node); |
215 | ipc_answer_0(rid, rc); |
216 | ipc_answer_0(rid, rc); |
216 | fibril_rwlock_write_unlock(&namespace_rwlock); |
217 | fibril_rwlock_write_unlock(&namespace_rwlock); |
217 | return; |
218 | return; |
218 | } |
219 | } |
219 | 220 | ||
220 | /* send the mount options */ |
221 | /* send the mount options */ |
221 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
222 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
222 | if (rc != EOK) { |
223 | if (rc != EOK) { |
223 | vfs_release_phone(phone); |
224 | vfs_release_phone(phone); |
224 | async_wait_for(msg, NULL); |
225 | async_wait_for(msg, NULL); |
225 | /* Mount failed, drop reference to mp_node. */ |
226 | /* Mount failed, drop reference to mp_node. */ |
226 | if (mp_node) |
227 | if (mp_node) |
227 | vfs_node_put(mp_node); |
228 | vfs_node_put(mp_node); |
228 | fibril_rwlock_write_unlock(&namespace_rwlock); |
229 | fibril_rwlock_write_unlock(&namespace_rwlock); |
229 | ipc_answer_0(rid, rc); |
230 | ipc_answer_0(rid, rc); |
230 | return; |
231 | return; |
231 | } |
232 | } |
232 | vfs_release_phone(phone); |
233 | vfs_release_phone(phone); |
233 | async_wait_for(msg, &rc); |
234 | async_wait_for(msg, &rc); |
234 | 235 | ||
235 | if (rc == EOK) { |
236 | if (rc == EOK) { |
236 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
237 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
237 | rsize = (size_t) IPC_GET_ARG2(answer); |
238 | rsize = (size_t) IPC_GET_ARG2(answer); |
238 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
239 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
239 | 240 | ||
240 | mr_res.triplet.fs_handle = fs_handle; |
241 | mr_res.triplet.fs_handle = fs_handle; |
241 | mr_res.triplet.dev_handle = dev_handle; |
242 | mr_res.triplet.dev_handle = dev_handle; |
242 | mr_res.triplet.index = rindex; |
243 | mr_res.triplet.index = rindex; |
243 | mr_res.size = rsize; |
244 | mr_res.size = rsize; |
244 | mr_res.lnkcnt = rlnkcnt; |
245 | mr_res.lnkcnt = rlnkcnt; |
245 | mr_res.type = VFS_NODE_DIRECTORY; |
246 | mr_res.type = VFS_NODE_DIRECTORY; |
246 | 247 | ||
247 | /* Add reference to the mounted root. */ |
248 | /* Add reference to the mounted root. */ |
248 | mr_node = vfs_node_get(&mr_res); |
249 | mr_node = vfs_node_get(&mr_res); |
249 | assert(mr_node); |
250 | assert(mr_node); |
250 | } else { |
251 | } else { |
251 | /* Mount failed, drop reference to mp_node. */ |
252 | /* Mount failed, drop reference to mp_node. */ |
252 | if (mp_node) |
253 | if (mp_node) |
253 | vfs_node_put(mp_node); |
254 | vfs_node_put(mp_node); |
254 | } |
255 | } |
255 | 256 | ||
256 | ipc_answer_0(rid, rc); |
257 | ipc_answer_0(rid, rc); |
257 | fibril_rwlock_write_unlock(&namespace_rwlock); |
258 | fibril_rwlock_write_unlock(&namespace_rwlock); |
258 | } |
259 | } |
259 | 260 | ||
260 | /** Process pending mount requests */ |
261 | /** Process pending mount requests */ |
261 | void vfs_process_pending_mount(void) |
262 | void vfs_process_pending_mount(void) |
262 | { |
263 | { |
263 | link_t *cur; |
264 | link_t *cur; |
264 | 265 | ||
265 | loop: |
266 | loop: |
- | 267 | fibril_mutex_lock(&pending_lock); |
|
266 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
268 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
267 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
269 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
268 | 270 | ||
269 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, true); |
271 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, true); |
270 | if (!fs_handle) |
272 | if (!fs_handle) |
271 | continue; |
273 | continue; |
272 | 274 | ||
273 | /* Acknowledge that we know fs_name. */ |
275 | /* Acknowledge that we know fs_name. */ |
274 | ipc_answer_0(pr->callid, EOK); |
276 | ipc_answer_0(pr->callid, EOK); |
275 | 277 | ||
276 | /* Do the mount */ |
278 | /* Do the mount */ |
277 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp, |
279 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp, |
278 | pr->opts); |
280 | pr->opts); |
279 | 281 | ||
280 | free(pr->fs_name); |
282 | free(pr->fs_name); |
281 | free(pr->mp); |
283 | free(pr->mp); |
282 | free(pr->opts); |
284 | free(pr->opts); |
283 | list_remove(cur); |
285 | list_remove(cur); |
284 | free(pr); |
286 | free(pr); |
- | 287 | fibril_mutex_unlock(&pending_lock); |
|
- | 288 | fibril_yield(); |
|
285 | goto loop; |
289 | goto loop; |
286 | } |
290 | } |
- | 291 | fibril_mutex_unlock(&pending_lock); |
|
287 | } |
292 | } |
288 | 293 | ||
289 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
294 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
290 | { |
295 | { |
291 | /* |
296 | /* |
292 | * We expect the library to do the device-name to device-handle |
297 | * We expect the library to do the device-name to device-handle |
293 | * translation for us, thus the device handle will arrive as ARG1 |
298 | * translation for us, thus the device handle will arrive as ARG1 |
294 | * in the request. |
299 | * in the request. |
295 | */ |
300 | */ |
296 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
301 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
297 | 302 | ||
298 | /* |
303 | /* |
299 | * Mount flags are passed as ARG2. |
304 | * Mount flags are passed as ARG2. |
300 | */ |
305 | */ |
301 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
306 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
302 | 307 | ||
303 | /* |
308 | /* |
304 | * For now, don't make use of ARG3, but it can be used to |
309 | * For now, don't make use of ARG3, but it can be used to |
305 | * carry mount options in the future. |
310 | * carry mount options in the future. |
306 | */ |
311 | */ |
307 | 312 | ||
308 | /* We want the client to send us the mount point. */ |
313 | /* We want the client to send us the mount point. */ |
309 | ipc_callid_t callid; |
314 | ipc_callid_t callid; |
310 | size_t size; |
315 | size_t size; |
311 | if (!ipc_data_write_receive(&callid, &size)) { |
316 | if (!ipc_data_write_receive(&callid, &size)) { |
312 | ipc_answer_0(callid, EINVAL); |
317 | ipc_answer_0(callid, EINVAL); |
313 | ipc_answer_0(rid, EINVAL); |
318 | ipc_answer_0(rid, EINVAL); |
314 | return; |
319 | return; |
315 | } |
320 | } |
316 | 321 | ||
317 | /* Check whether size is reasonable wrt. the mount point. */ |
322 | /* Check whether size is reasonable wrt. the mount point. */ |
318 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
323 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
319 | ipc_answer_0(callid, EINVAL); |
324 | ipc_answer_0(callid, EINVAL); |
320 | ipc_answer_0(rid, EINVAL); |
325 | ipc_answer_0(rid, EINVAL); |
321 | return; |
326 | return; |
322 | } |
327 | } |
323 | 328 | ||
324 | /* Allocate buffer for the mount point data being received. */ |
329 | /* Allocate buffer for the mount point data being received. */ |
325 | char *mp = malloc(size + 1); |
330 | char *mp = malloc(size + 1); |
326 | if (!mp) { |
331 | if (!mp) { |
327 | ipc_answer_0(callid, ENOMEM); |
332 | ipc_answer_0(callid, ENOMEM); |
328 | ipc_answer_0(rid, ENOMEM); |
333 | ipc_answer_0(rid, ENOMEM); |
329 | return; |
334 | return; |
330 | } |
335 | } |
331 | 336 | ||
332 | /* Deliver the mount point. */ |
337 | /* Deliver the mount point. */ |
333 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
338 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
334 | if (retval != EOK) { |
339 | if (retval != EOK) { |
335 | ipc_answer_0(rid, retval); |
340 | ipc_answer_0(rid, retval); |
336 | free(mp); |
341 | free(mp); |
337 | return; |
342 | return; |
338 | } |
343 | } |
339 | mp[size] = '\0'; |
344 | mp[size] = '\0'; |
340 | 345 | ||
341 | /* Now we expect to receive the mount options. */ |
346 | /* Now we expect to receive the mount options. */ |
342 | if (!ipc_data_write_receive(&callid, &size)) { |
347 | if (!ipc_data_write_receive(&callid, &size)) { |
343 | ipc_answer_0(callid, EINVAL); |
348 | ipc_answer_0(callid, EINVAL); |
344 | ipc_answer_0(rid, EINVAL); |
349 | ipc_answer_0(rid, EINVAL); |
345 | free(mp); |
350 | free(mp); |
346 | return; |
351 | return; |
347 | } |
352 | } |
348 | 353 | ||
349 | /* Check the offered options size. */ |
354 | /* Check the offered options size. */ |
350 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
355 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
351 | ipc_answer_0(callid, EINVAL); |
356 | ipc_answer_0(callid, EINVAL); |
352 | ipc_answer_0(rid, EINVAL); |
357 | ipc_answer_0(rid, EINVAL); |
353 | free(mp); |
358 | free(mp); |
354 | return; |
359 | return; |
355 | } |
360 | } |
356 | 361 | ||
357 | /* Allocate buffer for the mount options. */ |
362 | /* Allocate buffer for the mount options. */ |
358 | char *opts = (char *) malloc(size + 1); |
363 | char *opts = (char *) malloc(size + 1); |
359 | if (!opts) { |
364 | if (!opts) { |
360 | ipc_answer_0(callid, ENOMEM); |
365 | ipc_answer_0(callid, ENOMEM); |
361 | ipc_answer_0(rid, ENOMEM); |
366 | ipc_answer_0(rid, ENOMEM); |
362 | free(mp); |
367 | free(mp); |
363 | return; |
368 | return; |
364 | } |
369 | } |
365 | 370 | ||
366 | /* Deliver the mount options. */ |
371 | /* Deliver the mount options. */ |
367 | retval = ipc_data_write_finalize(callid, opts, size); |
372 | retval = ipc_data_write_finalize(callid, opts, size); |
368 | if (retval != EOK) { |
373 | if (retval != EOK) { |
369 | ipc_answer_0(rid, retval); |
374 | ipc_answer_0(rid, retval); |
370 | free(mp); |
375 | free(mp); |
371 | free(opts); |
376 | free(opts); |
372 | return; |
377 | return; |
373 | } |
378 | } |
374 | opts[size] = '\0'; |
379 | opts[size] = '\0'; |
375 | 380 | ||
376 | /* |
381 | /* |
377 | * Now, we expect the client to send us data with the name of the file |
382 | * Now, we expect the client to send us data with the name of the file |
378 | * system. |
383 | * system. |
379 | */ |
384 | */ |
380 | if (!ipc_data_write_receive(&callid, &size)) { |
385 | if (!ipc_data_write_receive(&callid, &size)) { |
381 | ipc_answer_0(callid, EINVAL); |
386 | ipc_answer_0(callid, EINVAL); |
382 | ipc_answer_0(rid, EINVAL); |
387 | ipc_answer_0(rid, EINVAL); |
383 | free(mp); |
388 | free(mp); |
384 | free(opts); |
389 | free(opts); |
385 | return; |
390 | return; |
386 | } |
391 | } |
387 | 392 | ||
388 | /* |
393 | /* |
389 | * Don't receive more than is necessary for storing a full file system |
394 | * Don't receive more than is necessary for storing a full file system |
390 | * name. |
395 | * name. |
391 | */ |
396 | */ |
392 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
397 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
393 | ipc_answer_0(callid, EINVAL); |
398 | ipc_answer_0(callid, EINVAL); |
394 | ipc_answer_0(rid, EINVAL); |
399 | ipc_answer_0(rid, EINVAL); |
395 | free(mp); |
400 | free(mp); |
396 | free(opts); |
401 | free(opts); |
397 | return; |
402 | return; |
398 | } |
403 | } |
399 | 404 | ||
400 | /* |
405 | /* |
401 | * Allocate buffer for file system name. |
406 | * Allocate buffer for file system name. |
402 | */ |
407 | */ |
403 | char *fs_name = (char *) malloc(size + 1); |
408 | char *fs_name = (char *) malloc(size + 1); |
404 | if (fs_name == NULL) { |
409 | if (fs_name == NULL) { |
405 | ipc_answer_0(callid, ENOMEM); |
410 | ipc_answer_0(callid, ENOMEM); |
406 | ipc_answer_0(rid, ENOMEM); |
411 | ipc_answer_0(rid, ENOMEM); |
407 | free(mp); |
412 | free(mp); |
408 | free(opts); |
413 | free(opts); |
409 | return; |
414 | return; |
410 | } |
415 | } |
411 | 416 | ||
412 | /* Deliver the file system name. */ |
417 | /* Deliver the file system name. */ |
413 | retval = ipc_data_write_finalize(callid, fs_name, size); |
418 | retval = ipc_data_write_finalize(callid, fs_name, size); |
414 | if (retval != EOK) { |
419 | if (retval != EOK) { |
415 | ipc_answer_0(rid, retval); |
420 | ipc_answer_0(rid, retval); |
416 | free(mp); |
421 | free(mp); |
417 | free(opts); |
422 | free(opts); |
418 | free(fs_name); |
423 | free(fs_name); |
419 | return; |
424 | return; |
420 | } |
425 | } |
421 | fs_name[size] = '\0'; |
426 | fs_name[size] = '\0'; |
422 | 427 | ||
423 | /* |
428 | /* |
424 | * Wait for IPC_M_PING so that we can return an error if we don't know |
429 | * Wait for IPC_M_PING so that we can return an error if we don't know |
425 | * fs_name. |
430 | * fs_name. |
426 | */ |
431 | */ |
427 | ipc_call_t data; |
432 | ipc_call_t data; |
428 | callid = async_get_call(&data); |
433 | callid = async_get_call(&data); |
429 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
434 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
430 | ipc_answer_0(callid, ENOTSUP); |
435 | ipc_answer_0(callid, ENOTSUP); |
431 | ipc_answer_0(rid, ENOTSUP); |
436 | ipc_answer_0(rid, ENOTSUP); |
432 | free(mp); |
437 | free(mp); |
433 | free(opts); |
438 | free(opts); |
434 | free(fs_name); |
439 | free(fs_name); |
435 | return; |
440 | return; |
436 | } |
441 | } |
437 | 442 | ||
438 | /* |
443 | /* |
439 | * Check if we know a file system with the same name as is in fs_name. |
444 | * Check if we know a file system with the same name as is in fs_name. |
440 | * This will also give us its file system handle. |
445 | * This will also give us its file system handle. |
441 | */ |
446 | */ |
442 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
447 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
443 | if (!fs_handle) { |
448 | if (!fs_handle) { |
444 | if (flags & IPC_FLAG_BLOCKING) { |
449 | if (flags & IPC_FLAG_BLOCKING) { |
445 | pending_req_t *pr; |
450 | pending_req_t *pr; |
446 | 451 | ||
447 | /* Blocking mount, add to pending list */ |
452 | /* Blocking mount, add to pending list */ |
448 | pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
453 | pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
449 | if (!pr) { |
454 | if (!pr) { |
450 | ipc_answer_0(callid, ENOMEM); |
455 | ipc_answer_0(callid, ENOMEM); |
451 | ipc_answer_0(rid, ENOMEM); |
456 | ipc_answer_0(rid, ENOMEM); |
452 | free(mp); |
457 | free(mp); |
453 | free(fs_name); |
458 | free(fs_name); |
454 | free(opts); |
459 | free(opts); |
455 | return; |
460 | return; |
456 | } |
461 | } |
457 | 462 | ||
458 | pr->fs_name = fs_name; |
463 | pr->fs_name = fs_name; |
459 | pr->mp = mp; |
464 | pr->mp = mp; |
460 | pr->opts = opts; |
465 | pr->opts = opts; |
461 | pr->callid = callid; |
466 | pr->callid = callid; |
462 | pr->rid = rid; |
467 | pr->rid = rid; |
463 | pr->dev_handle = dev_handle; |
468 | pr->dev_handle = dev_handle; |
464 | link_initialize(&pr->link); |
469 | link_initialize(&pr->link); |
- | 470 | fibril_mutex_lock(&pending_lock); |
|
465 | list_append(&pr->link, &pending_req); |
471 | list_append(&pr->link, &pending_req); |
- | 472 | fibril_mutex_unlock(&pending_lock); |
|
466 | return; |
473 | return; |
467 | } |
474 | } |
468 | 475 | ||
469 | ipc_answer_0(callid, ENOENT); |
476 | ipc_answer_0(callid, ENOENT); |
470 | ipc_answer_0(rid, ENOENT); |
477 | ipc_answer_0(rid, ENOENT); |
471 | free(mp); |
478 | free(mp); |
472 | free(fs_name); |
479 | free(fs_name); |
473 | free(opts); |
480 | free(opts); |
474 | return; |
481 | return; |
475 | } |
482 | } |
476 | 483 | ||
477 | /* Acknowledge that we know fs_name. */ |
484 | /* Acknowledge that we know fs_name. */ |
478 | ipc_answer_0(callid, EOK); |
485 | ipc_answer_0(callid, EOK); |
479 | 486 | ||
480 | /* Do the mount */ |
487 | /* Do the mount */ |
481 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
488 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
482 | free(mp); |
489 | free(mp); |
483 | free(fs_name); |
490 | free(fs_name); |
484 | free(opts); |
491 | free(opts); |
485 | } |
492 | } |
486 | 493 | ||
487 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
494 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
488 | { |
495 | { |
489 | if (!vfs_files_init()) { |
496 | if (!vfs_files_init()) { |
490 | ipc_answer_0(rid, ENOMEM); |
497 | ipc_answer_0(rid, ENOMEM); |
491 | return; |
498 | return; |
492 | } |
499 | } |
493 | 500 | ||
494 | /* |
501 | /* |
495 | * The POSIX interface is open(path, oflag, mode). |
502 | * The POSIX interface is open(path, oflag, mode). |
496 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
503 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
497 | * will need to arrive in another call. |
504 | * will need to arrive in another call. |
498 | * |
505 | * |
499 | * We also receive one private, non-POSIX set of flags called lflag |
506 | * We also receive one private, non-POSIX set of flags called lflag |
500 | * used to pass information to vfs_lookup_internal(). |
507 | * used to pass information to vfs_lookup_internal(). |
501 | */ |
508 | */ |
502 | int lflag = IPC_GET_ARG1(*request); |
509 | int lflag = IPC_GET_ARG1(*request); |
503 | int oflag = IPC_GET_ARG2(*request); |
510 | int oflag = IPC_GET_ARG2(*request); |
504 | int mode = IPC_GET_ARG3(*request); |
511 | int mode = IPC_GET_ARG3(*request); |
505 | size_t len; |
512 | size_t len; |
506 | 513 | ||
507 | /* |
514 | /* |
508 | * Make sure that we are called with exactly one of L_FILE and |
515 | * Make sure that we are called with exactly one of L_FILE and |
509 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
516 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
510 | */ |
517 | */ |
511 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
518 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
512 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
519 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
513 | ((lflag & L_OPEN) != 0)) { |
520 | ((lflag & L_OPEN) != 0)) { |
514 | ipc_answer_0(rid, EINVAL); |
521 | ipc_answer_0(rid, EINVAL); |
515 | return; |
522 | return; |
516 | } |
523 | } |
517 | 524 | ||
518 | if (oflag & O_CREAT) |
525 | if (oflag & O_CREAT) |
519 | lflag |= L_CREATE; |
526 | lflag |= L_CREATE; |
520 | if (oflag & O_EXCL) |
527 | if (oflag & O_EXCL) |
521 | lflag |= L_EXCLUSIVE; |
528 | lflag |= L_EXCLUSIVE; |
522 | 529 | ||
523 | ipc_callid_t callid; |
530 | ipc_callid_t callid; |
524 | if (!ipc_data_write_receive(&callid, &len)) { |
531 | if (!ipc_data_write_receive(&callid, &len)) { |
525 | ipc_answer_0(callid, EINVAL); |
532 | ipc_answer_0(callid, EINVAL); |
526 | ipc_answer_0(rid, EINVAL); |
533 | ipc_answer_0(rid, EINVAL); |
527 | return; |
534 | return; |
528 | } |
535 | } |
529 | 536 | ||
530 | char *path = malloc(len + 1); |
537 | char *path = malloc(len + 1); |
531 | if (!path) { |
538 | if (!path) { |
532 | ipc_answer_0(callid, ENOMEM); |
539 | ipc_answer_0(callid, ENOMEM); |
533 | ipc_answer_0(rid, ENOMEM); |
540 | ipc_answer_0(rid, ENOMEM); |
534 | return; |
541 | return; |
535 | } |
542 | } |
536 | 543 | ||
537 | int rc; |
544 | int rc; |
538 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
545 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
539 | ipc_answer_0(rid, rc); |
546 | ipc_answer_0(rid, rc); |
540 | free(path); |
547 | free(path); |
541 | return; |
548 | return; |
542 | } |
549 | } |
543 | path[len] = '\0'; |
550 | path[len] = '\0'; |
544 | 551 | ||
545 | /* |
552 | /* |
546 | * Avoid the race condition in which the file can be deleted before we |
553 | * Avoid the race condition in which the file can be deleted before we |
547 | * find/create-and-lock the VFS node corresponding to the looked-up |
554 | * find/create-and-lock the VFS node corresponding to the looked-up |
548 | * triplet. |
555 | * triplet. |
549 | */ |
556 | */ |
550 | if (lflag & L_CREATE) |
557 | if (lflag & L_CREATE) |
551 | fibril_rwlock_write_lock(&namespace_rwlock); |
558 | fibril_rwlock_write_lock(&namespace_rwlock); |
552 | else |
559 | else |
553 | fibril_rwlock_read_lock(&namespace_rwlock); |
560 | fibril_rwlock_read_lock(&namespace_rwlock); |
554 | 561 | ||
555 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
562 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
556 | vfs_lookup_res_t lr; |
563 | vfs_lookup_res_t lr; |
557 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
564 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
558 | if (rc != EOK) { |
565 | if (rc != EOK) { |
559 | if (lflag & L_CREATE) |
566 | if (lflag & L_CREATE) |
560 | fibril_rwlock_write_unlock(&namespace_rwlock); |
567 | fibril_rwlock_write_unlock(&namespace_rwlock); |
561 | else |
568 | else |
562 | fibril_rwlock_read_unlock(&namespace_rwlock); |
569 | fibril_rwlock_read_unlock(&namespace_rwlock); |
563 | ipc_answer_0(rid, rc); |
570 | ipc_answer_0(rid, rc); |
564 | free(path); |
571 | free(path); |
565 | return; |
572 | return; |
566 | } |
573 | } |
567 | 574 | ||
568 | /* Path is no longer needed. */ |
575 | /* Path is no longer needed. */ |
569 | free(path); |
576 | free(path); |
570 | 577 | ||
571 | vfs_node_t *node = vfs_node_get(&lr); |
578 | vfs_node_t *node = vfs_node_get(&lr); |
572 | if (lflag & L_CREATE) |
579 | if (lflag & L_CREATE) |
573 | fibril_rwlock_write_unlock(&namespace_rwlock); |
580 | fibril_rwlock_write_unlock(&namespace_rwlock); |
574 | else |
581 | else |
575 | fibril_rwlock_read_unlock(&namespace_rwlock); |
582 | fibril_rwlock_read_unlock(&namespace_rwlock); |
576 | 583 | ||
577 | /* Truncate the file if requested and if necessary. */ |
584 | /* Truncate the file if requested and if necessary. */ |
578 | if (oflag & O_TRUNC) { |
585 | if (oflag & O_TRUNC) { |
579 | fibril_rwlock_write_lock(&node->contents_rwlock); |
586 | fibril_rwlock_write_lock(&node->contents_rwlock); |
580 | if (node->size) { |
587 | if (node->size) { |
581 | rc = vfs_truncate_internal(node->fs_handle, |
588 | rc = vfs_truncate_internal(node->fs_handle, |
582 | node->dev_handle, node->index, 0); |
589 | node->dev_handle, node->index, 0); |
583 | if (rc) { |
590 | if (rc) { |
584 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
591 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
585 | vfs_node_put(node); |
592 | vfs_node_put(node); |
586 | ipc_answer_0(rid, rc); |
593 | ipc_answer_0(rid, rc); |
587 | return; |
594 | return; |
588 | } |
595 | } |
589 | node->size = 0; |
596 | node->size = 0; |
590 | } |
597 | } |
591 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
598 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
592 | } |
599 | } |
593 | 600 | ||
594 | /* |
601 | /* |
595 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
602 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
596 | * structure. |
603 | * structure. |
597 | */ |
604 | */ |
598 | int fd = vfs_fd_alloc(); |
605 | int fd = vfs_fd_alloc(); |
599 | if (fd < 0) { |
606 | if (fd < 0) { |
600 | vfs_node_put(node); |
607 | vfs_node_put(node); |
601 | ipc_answer_0(rid, fd); |
608 | ipc_answer_0(rid, fd); |
602 | return; |
609 | return; |
603 | } |
610 | } |
604 | vfs_file_t *file = vfs_file_get(fd); |
611 | vfs_file_t *file = vfs_file_get(fd); |
605 | file->node = node; |
612 | file->node = node; |
606 | if (oflag & O_APPEND) |
613 | if (oflag & O_APPEND) |
607 | file->append = true; |
614 | file->append = true; |
608 | 615 | ||
609 | /* |
616 | /* |
610 | * The following increase in reference count is for the fact that the |
617 | * The following increase in reference count is for the fact that the |
611 | * file is being opened and that a file structure is pointing to it. |
618 | * file is being opened and that a file structure is pointing to it. |
612 | * It is necessary so that the file will not disappear when |
619 | * It is necessary so that the file will not disappear when |
613 | * vfs_node_put() is called. The reference will be dropped by the |
620 | * vfs_node_put() is called. The reference will be dropped by the |
614 | * respective VFS_CLOSE. |
621 | * respective VFS_CLOSE. |
615 | */ |
622 | */ |
616 | vfs_node_addref(node); |
623 | vfs_node_addref(node); |
617 | vfs_node_put(node); |
624 | vfs_node_put(node); |
618 | 625 | ||
619 | /* Success! Return the new file descriptor to the client. */ |
626 | /* Success! Return the new file descriptor to the client. */ |
620 | ipc_answer_1(rid, EOK, fd); |
627 | ipc_answer_1(rid, EOK, fd); |
621 | } |
628 | } |
622 | 629 | ||
623 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
630 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
624 | { |
631 | { |
625 | // FIXME: check for sanity of the supplied fs, dev and index |
632 | // FIXME: check for sanity of the supplied fs, dev and index |
626 | 633 | ||
627 | if (!vfs_files_init()) { |
634 | if (!vfs_files_init()) { |
628 | ipc_answer_0(rid, ENOMEM); |
635 | ipc_answer_0(rid, ENOMEM); |
629 | return; |
636 | return; |
630 | } |
637 | } |
631 | 638 | ||
632 | /* |
639 | /* |
633 | * The interface is open_node(fs, dev, index, oflag). |
640 | * The interface is open_node(fs, dev, index, oflag). |
634 | */ |
641 | */ |
635 | vfs_lookup_res_t lr; |
642 | vfs_lookup_res_t lr; |
636 | 643 | ||
637 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
644 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
638 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
645 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
639 | lr.triplet.index = IPC_GET_ARG3(*request); |
646 | lr.triplet.index = IPC_GET_ARG3(*request); |
640 | int oflag = IPC_GET_ARG4(*request); |
647 | int oflag = IPC_GET_ARG4(*request); |
641 | 648 | ||
642 | fibril_rwlock_read_lock(&namespace_rwlock); |
649 | fibril_rwlock_read_lock(&namespace_rwlock); |
643 | 650 | ||
644 | int rc = vfs_open_node_internal(&lr); |
651 | int rc = vfs_open_node_internal(&lr); |
645 | if (rc != EOK) { |
652 | if (rc != EOK) { |
646 | fibril_rwlock_read_unlock(&namespace_rwlock); |
653 | fibril_rwlock_read_unlock(&namespace_rwlock); |
647 | ipc_answer_0(rid, rc); |
654 | ipc_answer_0(rid, rc); |
648 | return; |
655 | return; |
649 | } |
656 | } |
650 | 657 | ||
651 | vfs_node_t *node = vfs_node_get(&lr); |
658 | vfs_node_t *node = vfs_node_get(&lr); |
652 | fibril_rwlock_read_unlock(&namespace_rwlock); |
659 | fibril_rwlock_read_unlock(&namespace_rwlock); |
653 | 660 | ||
654 | /* Truncate the file if requested and if necessary. */ |
661 | /* Truncate the file if requested and if necessary. */ |
655 | if (oflag & O_TRUNC) { |
662 | if (oflag & O_TRUNC) { |
656 | fibril_rwlock_write_lock(&node->contents_rwlock); |
663 | fibril_rwlock_write_lock(&node->contents_rwlock); |
657 | if (node->size) { |
664 | if (node->size) { |
658 | rc = vfs_truncate_internal(node->fs_handle, |
665 | rc = vfs_truncate_internal(node->fs_handle, |
659 | node->dev_handle, node->index, 0); |
666 | node->dev_handle, node->index, 0); |
660 | if (rc) { |
667 | if (rc) { |
661 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
668 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
662 | vfs_node_put(node); |
669 | vfs_node_put(node); |
663 | ipc_answer_0(rid, rc); |
670 | ipc_answer_0(rid, rc); |
664 | return; |
671 | return; |
665 | } |
672 | } |
666 | node->size = 0; |
673 | node->size = 0; |
667 | } |
674 | } |
668 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
675 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
669 | } |
676 | } |
670 | 677 | ||
671 | /* |
678 | /* |
672 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
679 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
673 | * structure. |
680 | * structure. |
674 | */ |
681 | */ |
675 | int fd = vfs_fd_alloc(); |
682 | int fd = vfs_fd_alloc(); |
676 | if (fd < 0) { |
683 | if (fd < 0) { |
677 | vfs_node_put(node); |
684 | vfs_node_put(node); |
678 | ipc_answer_0(rid, fd); |
685 | ipc_answer_0(rid, fd); |
679 | return; |
686 | return; |
680 | } |
687 | } |
681 | vfs_file_t *file = vfs_file_get(fd); |
688 | vfs_file_t *file = vfs_file_get(fd); |
682 | file->node = node; |
689 | file->node = node; |
683 | if (oflag & O_APPEND) |
690 | if (oflag & O_APPEND) |
684 | file->append = true; |
691 | file->append = true; |
685 | 692 | ||
686 | /* |
693 | /* |
687 | * The following increase in reference count is for the fact that the |
694 | * The following increase in reference count is for the fact that the |
688 | * file is being opened and that a file structure is pointing to it. |
695 | * file is being opened and that a file structure is pointing to it. |
689 | * It is necessary so that the file will not disappear when |
696 | * It is necessary so that the file will not disappear when |
690 | * vfs_node_put() is called. The reference will be dropped by the |
697 | * vfs_node_put() is called. The reference will be dropped by the |
691 | * respective VFS_CLOSE. |
698 | * respective VFS_CLOSE. |
692 | */ |
699 | */ |
693 | vfs_node_addref(node); |
700 | vfs_node_addref(node); |
694 | vfs_node_put(node); |
701 | vfs_node_put(node); |
695 | 702 | ||
696 | /* Success! Return the new file descriptor to the client. */ |
703 | /* Success! Return the new file descriptor to the client. */ |
697 | ipc_answer_1(rid, EOK, fd); |
704 | ipc_answer_1(rid, EOK, fd); |
698 | } |
705 | } |
699 | 706 | ||
700 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
707 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
701 | { |
708 | { |
702 | int fd = IPC_GET_ARG1(*request); |
709 | int fd = IPC_GET_ARG1(*request); |
703 | 710 | ||
704 | /* Lookup the file structure corresponding to the file descriptor. */ |
711 | /* Lookup the file structure corresponding to the file descriptor. */ |
705 | vfs_file_t *file = vfs_file_get(fd); |
712 | vfs_file_t *file = vfs_file_get(fd); |
706 | if (!file) { |
713 | if (!file) { |
707 | ipc_answer_0(rid, ENOENT); |
714 | ipc_answer_0(rid, ENOENT); |
708 | return; |
715 | return; |
709 | } |
716 | } |
710 | 717 | ||
711 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
718 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
712 | file->node->index); |
719 | file->node->index); |
713 | } |
720 | } |
714 | 721 | ||
715 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
722 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
716 | { |
723 | { |
717 | int fd = IPC_GET_ARG1(*request); |
724 | int fd = IPC_GET_ARG1(*request); |
718 | 725 | ||
719 | /* Lookup the file structure corresponding to the file descriptor. */ |
726 | /* Lookup the file structure corresponding to the file descriptor. */ |
720 | vfs_file_t *file = vfs_file_get(fd); |
727 | vfs_file_t *file = vfs_file_get(fd); |
721 | if (!file) { |
728 | if (!file) { |
722 | ipc_answer_0(rid, ENOENT); |
729 | ipc_answer_0(rid, ENOENT); |
723 | return; |
730 | return; |
724 | } |
731 | } |
725 | 732 | ||
726 | /* |
733 | /* |
727 | * Lock the open file structure so that no other thread can manipulate |
734 | * Lock the open file structure so that no other thread can manipulate |
728 | * the same open file at a time. |
735 | * the same open file at a time. |
729 | */ |
736 | */ |
730 | fibril_mutex_lock(&file->lock); |
737 | fibril_mutex_lock(&file->lock); |
731 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
738 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
732 | 739 | ||
733 | /* Make a VFS_DEVICE request at the destination FS server. */ |
740 | /* Make a VFS_DEVICE request at the destination FS server. */ |
734 | aid_t msg; |
741 | aid_t msg; |
735 | ipc_call_t answer; |
742 | ipc_call_t answer; |
736 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
743 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
737 | file->node->dev_handle, file->node->index, &answer); |
744 | file->node->dev_handle, file->node->index, &answer); |
738 | 745 | ||
739 | vfs_release_phone(fs_phone); |
746 | vfs_release_phone(fs_phone); |
740 | 747 | ||
741 | /* Wait for reply from the FS server. */ |
748 | /* Wait for reply from the FS server. */ |
742 | ipcarg_t rc; |
749 | ipcarg_t rc; |
743 | async_wait_for(msg, &rc); |
750 | async_wait_for(msg, &rc); |
744 | 751 | ||
745 | fibril_mutex_unlock(&file->lock); |
752 | fibril_mutex_unlock(&file->lock); |
746 | 753 | ||
747 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
754 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
748 | } |
755 | } |
749 | 756 | ||
750 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
757 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
751 | { |
758 | { |
752 | int fd = IPC_GET_ARG1(*request); |
759 | int fd = IPC_GET_ARG1(*request); |
753 | 760 | ||
754 | /* Lookup the file structure corresponding to the file descriptor. */ |
761 | /* Lookup the file structure corresponding to the file descriptor. */ |
755 | vfs_file_t *file = vfs_file_get(fd); |
762 | vfs_file_t *file = vfs_file_get(fd); |
756 | if (!file) { |
763 | if (!file) { |
757 | ipc_answer_0(rid, ENOENT); |
764 | ipc_answer_0(rid, ENOENT); |
758 | return; |
765 | return; |
759 | } |
766 | } |
760 | 767 | ||
761 | /* |
768 | /* |
762 | * Lock the open file structure so that no other thread can manipulate |
769 | * Lock the open file structure so that no other thread can manipulate |
763 | * the same open file at a time. |
770 | * the same open file at a time. |
764 | */ |
771 | */ |
765 | fibril_mutex_lock(&file->lock); |
772 | fibril_mutex_lock(&file->lock); |
766 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
773 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
767 | 774 | ||
768 | /* Make a VFS_SYMC request at the destination FS server. */ |
775 | /* Make a VFS_SYMC request at the destination FS server. */ |
769 | aid_t msg; |
776 | aid_t msg; |
770 | ipc_call_t answer; |
777 | ipc_call_t answer; |
771 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
778 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
772 | file->node->dev_handle, file->node->index, &answer); |
779 | file->node->dev_handle, file->node->index, &answer); |
773 | 780 | ||
774 | vfs_release_phone(fs_phone); |
781 | vfs_release_phone(fs_phone); |
775 | 782 | ||
776 | /* Wait for reply from the FS server. */ |
783 | /* Wait for reply from the FS server. */ |
777 | ipcarg_t rc; |
784 | ipcarg_t rc; |
778 | async_wait_for(msg, &rc); |
785 | async_wait_for(msg, &rc); |
779 | 786 | ||
780 | fibril_mutex_unlock(&file->lock); |
787 | fibril_mutex_unlock(&file->lock); |
781 | 788 | ||
782 | ipc_answer_0(rid, rc); |
789 | ipc_answer_0(rid, rc); |
783 | } |
790 | } |
784 | 791 | ||
785 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
792 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
786 | { |
793 | { |
787 | int fd = IPC_GET_ARG1(*request); |
794 | int fd = IPC_GET_ARG1(*request); |
788 | 795 | ||
789 | /* Lookup the file structure corresponding to the file descriptor. */ |
796 | /* Lookup the file structure corresponding to the file descriptor. */ |
790 | vfs_file_t *file = vfs_file_get(fd); |
797 | vfs_file_t *file = vfs_file_get(fd); |
791 | if (!file) { |
798 | if (!file) { |
792 | ipc_answer_0(rid, ENOENT); |
799 | ipc_answer_0(rid, ENOENT); |
793 | return; |
800 | return; |
794 | } |
801 | } |
795 | 802 | ||
796 | /* |
803 | /* |
797 | * Lock the open file structure so that no other thread can manipulate |
804 | * Lock the open file structure so that no other thread can manipulate |
798 | * the same open file at a time. |
805 | * the same open file at a time. |
799 | */ |
806 | */ |
800 | fibril_mutex_lock(&file->lock); |
807 | fibril_mutex_lock(&file->lock); |
801 | 808 | ||
802 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
809 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
803 | 810 | ||
804 | /* Make a VFS_CLOSE request at the destination FS server. */ |
811 | /* Make a VFS_CLOSE request at the destination FS server. */ |
805 | aid_t msg; |
812 | aid_t msg; |
806 | ipc_call_t answer; |
813 | ipc_call_t answer; |
807 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
814 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
808 | file->node->dev_handle, file->node->index, &answer); |
815 | file->node->dev_handle, file->node->index, &answer); |
809 | 816 | ||
810 | vfs_release_phone(fs_phone); |
817 | vfs_release_phone(fs_phone); |
811 | 818 | ||
812 | /* Wait for reply from the FS server. */ |
819 | /* Wait for reply from the FS server. */ |
813 | ipcarg_t rc; |
820 | ipcarg_t rc; |
814 | async_wait_for(msg, &rc); |
821 | async_wait_for(msg, &rc); |
815 | 822 | ||
816 | fibril_mutex_unlock(&file->lock); |
823 | fibril_mutex_unlock(&file->lock); |
817 | 824 | ||
818 | int retval = IPC_GET_ARG1(answer); |
825 | int retval = IPC_GET_ARG1(answer); |
819 | if (retval != EOK) |
826 | if (retval != EOK) |
820 | ipc_answer_0(rid, retval); |
827 | ipc_answer_0(rid, retval); |
821 | 828 | ||
822 | retval = vfs_fd_free(fd); |
829 | retval = vfs_fd_free(fd); |
823 | ipc_answer_0(rid, retval); |
830 | ipc_answer_0(rid, retval); |
824 | } |
831 | } |
825 | 832 | ||
826 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
833 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
827 | { |
834 | { |
828 | 835 | ||
829 | /* |
836 | /* |
830 | * The following code strongly depends on the fact that the files data |
837 | * The following code strongly depends on the fact that the files data |
831 | * structure can be only accessed by a single fibril and all file |
838 | * structure can be only accessed by a single fibril and all file |
832 | * operations are serialized (i.e. the reads and writes cannot |
839 | * operations are serialized (i.e. the reads and writes cannot |
833 | * interleave and a file cannot be closed while it is being read). |
840 | * interleave and a file cannot be closed while it is being read). |
834 | * |
841 | * |
835 | * Additional synchronization needs to be added once the table of |
842 | * Additional synchronization needs to be added once the table of |
836 | * open files supports parallel access! |
843 | * open files supports parallel access! |
837 | */ |
844 | */ |
838 | 845 | ||
839 | int fd = IPC_GET_ARG1(*request); |
846 | int fd = IPC_GET_ARG1(*request); |
840 | 847 | ||
841 | /* Lookup the file structure corresponding to the file descriptor. */ |
848 | /* Lookup the file structure corresponding to the file descriptor. */ |
842 | vfs_file_t *file = vfs_file_get(fd); |
849 | vfs_file_t *file = vfs_file_get(fd); |
843 | if (!file) { |
850 | if (!file) { |
844 | ipc_answer_0(rid, ENOENT); |
851 | ipc_answer_0(rid, ENOENT); |
845 | return; |
852 | return; |
846 | } |
853 | } |
847 | 854 | ||
848 | /* |
855 | /* |
849 | * Now we need to receive a call with client's |
856 | * Now we need to receive a call with client's |
850 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
857 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
851 | */ |
858 | */ |
852 | ipc_callid_t callid; |
859 | ipc_callid_t callid; |
853 | int res; |
860 | int res; |
854 | if (read) |
861 | if (read) |
855 | res = ipc_data_read_receive(&callid, NULL); |
862 | res = ipc_data_read_receive(&callid, NULL); |
856 | else |
863 | else |
857 | res = ipc_data_write_receive(&callid, NULL); |
864 | res = ipc_data_write_receive(&callid, NULL); |
858 | if (!res) { |
865 | if (!res) { |
859 | ipc_answer_0(callid, EINVAL); |
866 | ipc_answer_0(callid, EINVAL); |
860 | ipc_answer_0(rid, EINVAL); |
867 | ipc_answer_0(rid, EINVAL); |
861 | return; |
868 | return; |
862 | } |
869 | } |
863 | 870 | ||
864 | /* |
871 | /* |
865 | * Lock the open file structure so that no other thread can manipulate |
872 | * Lock the open file structure so that no other thread can manipulate |
866 | * the same open file at a time. |
873 | * the same open file at a time. |
867 | */ |
874 | */ |
868 | fibril_mutex_lock(&file->lock); |
875 | fibril_mutex_lock(&file->lock); |
869 | 876 | ||
870 | /* |
877 | /* |
871 | * Lock the file's node so that no other client can read/write to it at |
878 | * Lock the file's node so that no other client can read/write to it at |
872 | * the same time. |
879 | * the same time. |
873 | */ |
880 | */ |
874 | if (read) |
881 | if (read) |
875 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
882 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
876 | else |
883 | else |
877 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
884 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
878 | 885 | ||
879 | if (file->node->type == VFS_NODE_DIRECTORY) { |
886 | if (file->node->type == VFS_NODE_DIRECTORY) { |
880 | /* |
887 | /* |
881 | * Make sure that no one is modifying the namespace |
888 | * Make sure that no one is modifying the namespace |
882 | * while we are in readdir(). |
889 | * while we are in readdir(). |
883 | */ |
890 | */ |
884 | assert(read); |
891 | assert(read); |
885 | fibril_rwlock_read_lock(&namespace_rwlock); |
892 | fibril_rwlock_read_lock(&namespace_rwlock); |
886 | } |
893 | } |
887 | 894 | ||
888 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
895 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
889 | 896 | ||
890 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
897 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
891 | aid_t msg; |
898 | aid_t msg; |
892 | ipc_call_t answer; |
899 | ipc_call_t answer; |
893 | if (!read && file->append) |
900 | if (!read && file->append) |
894 | file->pos = file->node->size; |
901 | file->pos = file->node->size; |
895 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
902 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
896 | file->node->dev_handle, file->node->index, file->pos, &answer); |
903 | file->node->dev_handle, file->node->index, file->pos, &answer); |
897 | 904 | ||
898 | /* |
905 | /* |
899 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
906 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
900 | * destination FS server. The call will be routed as if sent by |
907 | * destination FS server. The call will be routed as if sent by |
901 | * ourselves. Note that call arguments are immutable in this case so we |
908 | * ourselves. Note that call arguments are immutable in this case so we |
902 | * don't have to bother. |
909 | * don't have to bother. |
903 | */ |
910 | */ |
904 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
911 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
905 | 912 | ||
906 | vfs_release_phone(fs_phone); |
913 | vfs_release_phone(fs_phone); |
907 | 914 | ||
908 | /* Wait for reply from the FS server. */ |
915 | /* Wait for reply from the FS server. */ |
909 | ipcarg_t rc; |
916 | ipcarg_t rc; |
910 | async_wait_for(msg, &rc); |
917 | async_wait_for(msg, &rc); |
911 | 918 | ||
912 | size_t bytes = IPC_GET_ARG1(answer); |
919 | size_t bytes = IPC_GET_ARG1(answer); |
913 | 920 | ||
914 | if (file->node->type == VFS_NODE_DIRECTORY) |
921 | if (file->node->type == VFS_NODE_DIRECTORY) |
915 | fibril_rwlock_read_unlock(&namespace_rwlock); |
922 | fibril_rwlock_read_unlock(&namespace_rwlock); |
916 | 923 | ||
917 | /* Unlock the VFS node. */ |
924 | /* Unlock the VFS node. */ |
918 | if (read) |
925 | if (read) |
919 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
926 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
920 | else { |
927 | else { |
921 | /* Update the cached version of node's size. */ |
928 | /* Update the cached version of node's size. */ |
922 | if (rc == EOK) |
929 | if (rc == EOK) |
923 | file->node->size = IPC_GET_ARG2(answer); |
930 | file->node->size = IPC_GET_ARG2(answer); |
924 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
931 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
925 | } |
932 | } |
926 | 933 | ||
927 | /* Update the position pointer and unlock the open file. */ |
934 | /* Update the position pointer and unlock the open file. */ |
928 | if (rc == EOK) |
935 | if (rc == EOK) |
929 | file->pos += bytes; |
936 | file->pos += bytes; |
930 | fibril_mutex_unlock(&file->lock); |
937 | fibril_mutex_unlock(&file->lock); |
931 | 938 | ||
932 | /* |
939 | /* |
933 | * FS server's reply is the final result of the whole operation we |
940 | * FS server's reply is the final result of the whole operation we |
934 | * return to the client. |
941 | * return to the client. |
935 | */ |
942 | */ |
936 | ipc_answer_1(rid, rc, bytes); |
943 | ipc_answer_1(rid, rc, bytes); |
937 | } |
944 | } |
938 | 945 | ||
939 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
946 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
940 | { |
947 | { |
941 | vfs_rdwr(rid, request, true); |
948 | vfs_rdwr(rid, request, true); |
942 | } |
949 | } |
943 | 950 | ||
944 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
951 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
945 | { |
952 | { |
946 | vfs_rdwr(rid, request, false); |
953 | vfs_rdwr(rid, request, false); |
947 | } |
954 | } |
948 | 955 | ||
949 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
956 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
950 | { |
957 | { |
951 | int fd = (int) IPC_GET_ARG1(*request); |
958 | int fd = (int) IPC_GET_ARG1(*request); |
952 | off_t off = (off_t) IPC_GET_ARG2(*request); |
959 | off_t off = (off_t) IPC_GET_ARG2(*request); |
953 | int whence = (int) IPC_GET_ARG3(*request); |
960 | int whence = (int) IPC_GET_ARG3(*request); |
954 | 961 | ||
955 | 962 | ||
956 | /* Lookup the file structure corresponding to the file descriptor. */ |
963 | /* Lookup the file structure corresponding to the file descriptor. */ |
957 | vfs_file_t *file = vfs_file_get(fd); |
964 | vfs_file_t *file = vfs_file_get(fd); |
958 | if (!file) { |
965 | if (!file) { |
959 | ipc_answer_0(rid, ENOENT); |
966 | ipc_answer_0(rid, ENOENT); |
960 | return; |
967 | return; |
961 | } |
968 | } |
962 | 969 | ||
963 | off_t newpos; |
970 | off_t newpos; |
964 | fibril_mutex_lock(&file->lock); |
971 | fibril_mutex_lock(&file->lock); |
965 | if (whence == SEEK_SET) { |
972 | if (whence == SEEK_SET) { |
966 | file->pos = off; |
973 | file->pos = off; |
967 | fibril_mutex_unlock(&file->lock); |
974 | fibril_mutex_unlock(&file->lock); |
968 | ipc_answer_1(rid, EOK, off); |
975 | ipc_answer_1(rid, EOK, off); |
969 | return; |
976 | return; |
970 | } |
977 | } |
971 | if (whence == SEEK_CUR) { |
978 | if (whence == SEEK_CUR) { |
972 | if (file->pos + off < file->pos) { |
979 | if (file->pos + off < file->pos) { |
973 | fibril_mutex_unlock(&file->lock); |
980 | fibril_mutex_unlock(&file->lock); |
974 | ipc_answer_0(rid, EOVERFLOW); |
981 | ipc_answer_0(rid, EOVERFLOW); |
975 | return; |
982 | return; |
976 | } |
983 | } |
977 | file->pos += off; |
984 | file->pos += off; |
978 | newpos = file->pos; |
985 | newpos = file->pos; |
979 | fibril_mutex_unlock(&file->lock); |
986 | fibril_mutex_unlock(&file->lock); |
980 | ipc_answer_1(rid, EOK, newpos); |
987 | ipc_answer_1(rid, EOK, newpos); |
981 | return; |
988 | return; |
982 | } |
989 | } |
983 | if (whence == SEEK_END) { |
990 | if (whence == SEEK_END) { |
984 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
991 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
985 | size_t size = file->node->size; |
992 | size_t size = file->node->size; |
986 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
993 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
987 | if (size + off < size) { |
994 | if (size + off < size) { |
988 | fibril_mutex_unlock(&file->lock); |
995 | fibril_mutex_unlock(&file->lock); |
989 | ipc_answer_0(rid, EOVERFLOW); |
996 | ipc_answer_0(rid, EOVERFLOW); |
990 | return; |
997 | return; |
991 | } |
998 | } |
992 | newpos = size + off; |
999 | newpos = size + off; |
993 | fibril_mutex_unlock(&file->lock); |
1000 | fibril_mutex_unlock(&file->lock); |
994 | ipc_answer_1(rid, EOK, newpos); |
1001 | ipc_answer_1(rid, EOK, newpos); |
995 | return; |
1002 | return; |
996 | } |
1003 | } |
997 | fibril_mutex_unlock(&file->lock); |
1004 | fibril_mutex_unlock(&file->lock); |
998 | ipc_answer_0(rid, EINVAL); |
1005 | ipc_answer_0(rid, EINVAL); |
999 | } |
1006 | } |
1000 | 1007 | ||
1001 | int |
1008 | int |
1002 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
1009 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
1003 | fs_index_t index, size_t size) |
1010 | fs_index_t index, size_t size) |
1004 | { |
1011 | { |
1005 | ipcarg_t rc; |
1012 | ipcarg_t rc; |
1006 | int fs_phone; |
1013 | int fs_phone; |
1007 | 1014 | ||
1008 | fs_phone = vfs_grab_phone(fs_handle); |
1015 | fs_phone = vfs_grab_phone(fs_handle); |
1009 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
1016 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
1010 | (ipcarg_t)index, (ipcarg_t)size); |
1017 | (ipcarg_t)index, (ipcarg_t)size); |
1011 | vfs_release_phone(fs_phone); |
1018 | vfs_release_phone(fs_phone); |
1012 | return (int)rc; |
1019 | return (int)rc; |
1013 | } |
1020 | } |
1014 | 1021 | ||
1015 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
1022 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
1016 | { |
1023 | { |
1017 | int fd = IPC_GET_ARG1(*request); |
1024 | int fd = IPC_GET_ARG1(*request); |
1018 | size_t size = IPC_GET_ARG2(*request); |
1025 | size_t size = IPC_GET_ARG2(*request); |
1019 | int rc; |
1026 | int rc; |
1020 | 1027 | ||
1021 | vfs_file_t *file = vfs_file_get(fd); |
1028 | vfs_file_t *file = vfs_file_get(fd); |
1022 | if (!file) { |
1029 | if (!file) { |
1023 | ipc_answer_0(rid, ENOENT); |
1030 | ipc_answer_0(rid, ENOENT); |
1024 | return; |
1031 | return; |
1025 | } |
1032 | } |
1026 | fibril_mutex_lock(&file->lock); |
1033 | fibril_mutex_lock(&file->lock); |
1027 | 1034 | ||
1028 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
1035 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
1029 | rc = vfs_truncate_internal(file->node->fs_handle, |
1036 | rc = vfs_truncate_internal(file->node->fs_handle, |
1030 | file->node->dev_handle, file->node->index, size); |
1037 | file->node->dev_handle, file->node->index, size); |
1031 | if (rc == EOK) |
1038 | if (rc == EOK) |
1032 | file->node->size = size; |
1039 | file->node->size = size; |
1033 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
1040 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
1034 | 1041 | ||
1035 | fibril_mutex_unlock(&file->lock); |
1042 | fibril_mutex_unlock(&file->lock); |
1036 | ipc_answer_0(rid, (ipcarg_t)rc); |
1043 | ipc_answer_0(rid, (ipcarg_t)rc); |
1037 | } |
1044 | } |
1038 | 1045 | ||
1039 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
1046 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
1040 | { |
1047 | { |
1041 | int mode = IPC_GET_ARG1(*request); |
1048 | int mode = IPC_GET_ARG1(*request); |
1042 | 1049 | ||
1043 | size_t len; |
1050 | size_t len; |
1044 | ipc_callid_t callid; |
1051 | ipc_callid_t callid; |
1045 | 1052 | ||
1046 | if (!ipc_data_write_receive(&callid, &len)) { |
1053 | if (!ipc_data_write_receive(&callid, &len)) { |
1047 | ipc_answer_0(callid, EINVAL); |
1054 | ipc_answer_0(callid, EINVAL); |
1048 | ipc_answer_0(rid, EINVAL); |
1055 | ipc_answer_0(rid, EINVAL); |
1049 | return; |
1056 | return; |
1050 | } |
1057 | } |
1051 | char *path = malloc(len + 1); |
1058 | char *path = malloc(len + 1); |
1052 | if (!path) { |
1059 | if (!path) { |
1053 | ipc_answer_0(callid, ENOMEM); |
1060 | ipc_answer_0(callid, ENOMEM); |
1054 | ipc_answer_0(rid, ENOMEM); |
1061 | ipc_answer_0(rid, ENOMEM); |
1055 | return; |
1062 | return; |
1056 | } |
1063 | } |
1057 | int rc; |
1064 | int rc; |
1058 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1065 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1059 | ipc_answer_0(rid, rc); |
1066 | ipc_answer_0(rid, rc); |
1060 | free(path); |
1067 | free(path); |
1061 | return; |
1068 | return; |
1062 | } |
1069 | } |
1063 | path[len] = '\0'; |
1070 | path[len] = '\0'; |
1064 | 1071 | ||
1065 | fibril_rwlock_write_lock(&namespace_rwlock); |
1072 | fibril_rwlock_write_lock(&namespace_rwlock); |
1066 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
1073 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
1067 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
1074 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
1068 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1075 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1069 | free(path); |
1076 | free(path); |
1070 | ipc_answer_0(rid, rc); |
1077 | ipc_answer_0(rid, rc); |
1071 | } |
1078 | } |
1072 | 1079 | ||
1073 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
1080 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
1074 | { |
1081 | { |
1075 | int lflag = IPC_GET_ARG1(*request); |
1082 | int lflag = IPC_GET_ARG1(*request); |
1076 | 1083 | ||
1077 | size_t len; |
1084 | size_t len; |
1078 | ipc_callid_t callid; |
1085 | ipc_callid_t callid; |
1079 | 1086 | ||
1080 | if (!ipc_data_write_receive(&callid, &len)) { |
1087 | if (!ipc_data_write_receive(&callid, &len)) { |
1081 | ipc_answer_0(callid, EINVAL); |
1088 | ipc_answer_0(callid, EINVAL); |
1082 | ipc_answer_0(rid, EINVAL); |
1089 | ipc_answer_0(rid, EINVAL); |
1083 | return; |
1090 | return; |
1084 | } |
1091 | } |
1085 | char *path = malloc(len + 1); |
1092 | char *path = malloc(len + 1); |
1086 | if (!path) { |
1093 | if (!path) { |
1087 | ipc_answer_0(callid, ENOMEM); |
1094 | ipc_answer_0(callid, ENOMEM); |
1088 | ipc_answer_0(rid, ENOMEM); |
1095 | ipc_answer_0(rid, ENOMEM); |
1089 | return; |
1096 | return; |
1090 | } |
1097 | } |
1091 | int rc; |
1098 | int rc; |
1092 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1099 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1093 | ipc_answer_0(rid, rc); |
1100 | ipc_answer_0(rid, rc); |
1094 | free(path); |
1101 | free(path); |
1095 | return; |
1102 | return; |
1096 | } |
1103 | } |
1097 | path[len] = '\0'; |
1104 | path[len] = '\0'; |
1098 | 1105 | ||
1099 | fibril_rwlock_write_lock(&namespace_rwlock); |
1106 | fibril_rwlock_write_lock(&namespace_rwlock); |
1100 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
1107 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
1101 | vfs_lookup_res_t lr; |
1108 | vfs_lookup_res_t lr; |
1102 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
1109 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
1103 | free(path); |
1110 | free(path); |
1104 | if (rc != EOK) { |
1111 | if (rc != EOK) { |
1105 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1112 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1106 | ipc_answer_0(rid, rc); |
1113 | ipc_answer_0(rid, rc); |
1107 | return; |
1114 | return; |
1108 | } |
1115 | } |
1109 | 1116 | ||
1110 | /* |
1117 | /* |
1111 | * The name has already been unlinked by vfs_lookup_internal(). |
1118 | * The name has already been unlinked by vfs_lookup_internal(). |
1112 | * We have to get and put the VFS node to ensure that it is |
1119 | * We have to get and put the VFS node to ensure that it is |
1113 | * VFS_DESTROY'ed after the last reference to it is dropped. |
1120 | * VFS_DESTROY'ed after the last reference to it is dropped. |
1114 | */ |
1121 | */ |
1115 | vfs_node_t *node = vfs_node_get(&lr); |
1122 | vfs_node_t *node = vfs_node_get(&lr); |
1116 | futex_down(&nodes_futex); |
1123 | futex_down(&nodes_futex); |
1117 | node->lnkcnt--; |
1124 | node->lnkcnt--; |
1118 | futex_up(&nodes_futex); |
1125 | futex_up(&nodes_futex); |
1119 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1126 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1120 | vfs_node_put(node); |
1127 | vfs_node_put(node); |
1121 | ipc_answer_0(rid, EOK); |
1128 | ipc_answer_0(rid, EOK); |
1122 | } |
1129 | } |
1123 | 1130 | ||
1124 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
1131 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
1125 | { |
1132 | { |
1126 | size_t olen, nlen; |
1133 | size_t olen, nlen; |
1127 | ipc_callid_t callid; |
1134 | ipc_callid_t callid; |
1128 | int rc; |
1135 | int rc; |
1129 | 1136 | ||
1130 | /* Retrieve the old path. */ |
1137 | /* Retrieve the old path. */ |
1131 | if (!ipc_data_write_receive(&callid, &olen)) { |
1138 | if (!ipc_data_write_receive(&callid, &olen)) { |
1132 | ipc_answer_0(callid, EINVAL); |
1139 | ipc_answer_0(callid, EINVAL); |
1133 | ipc_answer_0(rid, EINVAL); |
1140 | ipc_answer_0(rid, EINVAL); |
1134 | return; |
1141 | return; |
1135 | } |
1142 | } |
1136 | char *old = malloc(olen + 1); |
1143 | char *old = malloc(olen + 1); |
1137 | if (!old) { |
1144 | if (!old) { |
1138 | ipc_answer_0(callid, ENOMEM); |
1145 | ipc_answer_0(callid, ENOMEM); |
1139 | ipc_answer_0(rid, ENOMEM); |
1146 | ipc_answer_0(rid, ENOMEM); |
1140 | return; |
1147 | return; |
1141 | } |
1148 | } |
1142 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
1149 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
1143 | ipc_answer_0(rid, rc); |
1150 | ipc_answer_0(rid, rc); |
1144 | free(old); |
1151 | free(old); |
1145 | return; |
1152 | return; |
1146 | } |
1153 | } |
1147 | old[olen] = '\0'; |
1154 | old[olen] = '\0'; |
1148 | 1155 | ||
1149 | /* Retrieve the new path. */ |
1156 | /* Retrieve the new path. */ |
1150 | if (!ipc_data_write_receive(&callid, &nlen)) { |
1157 | if (!ipc_data_write_receive(&callid, &nlen)) { |
1151 | ipc_answer_0(callid, EINVAL); |
1158 | ipc_answer_0(callid, EINVAL); |
1152 | ipc_answer_0(rid, EINVAL); |
1159 | ipc_answer_0(rid, EINVAL); |
1153 | free(old); |
1160 | free(old); |
1154 | return; |
1161 | return; |
1155 | } |
1162 | } |
1156 | char *new = malloc(nlen + 1); |
1163 | char *new = malloc(nlen + 1); |
1157 | if (!new) { |
1164 | if (!new) { |
1158 | ipc_answer_0(callid, ENOMEM); |
1165 | ipc_answer_0(callid, ENOMEM); |
1159 | ipc_answer_0(rid, ENOMEM); |
1166 | ipc_answer_0(rid, ENOMEM); |
1160 | free(old); |
1167 | free(old); |
1161 | return; |
1168 | return; |
1162 | } |
1169 | } |
1163 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
1170 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
1164 | ipc_answer_0(rid, rc); |
1171 | ipc_answer_0(rid, rc); |
1165 | free(old); |
1172 | free(old); |
1166 | free(new); |
1173 | free(new); |
1167 | return; |
1174 | return; |
1168 | } |
1175 | } |
1169 | new[nlen] = '\0'; |
1176 | new[nlen] = '\0'; |
1170 | 1177 | ||
1171 | char *oldc = canonify(old, &olen); |
1178 | char *oldc = canonify(old, &olen); |
1172 | char *newc = canonify(new, &nlen); |
1179 | char *newc = canonify(new, &nlen); |
1173 | if (!oldc || !newc) { |
1180 | if (!oldc || !newc) { |
1174 | ipc_answer_0(rid, EINVAL); |
1181 | ipc_answer_0(rid, EINVAL); |
1175 | free(old); |
1182 | free(old); |
1176 | free(new); |
1183 | free(new); |
1177 | return; |
1184 | return; |
1178 | } |
1185 | } |
1179 | oldc[olen] = '\0'; |
1186 | oldc[olen] = '\0'; |
1180 | newc[nlen] = '\0'; |
1187 | newc[nlen] = '\0'; |
1181 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
1188 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
1182 | ((newc[str_length(oldc)] == '/') || |
1189 | ((newc[str_length(oldc)] == '/') || |
1183 | (str_length(oldc) == 1) || |
1190 | (str_length(oldc) == 1) || |
1184 | (str_length(oldc) == str_length(newc)))) { |
1191 | (str_length(oldc) == str_length(newc)))) { |
1185 | /* |
1192 | /* |
1186 | * oldc is a prefix of newc and either |
1193 | * oldc is a prefix of newc and either |
1187 | * - newc continues with a / where oldc ends, or |
1194 | * - newc continues with a / where oldc ends, or |
1188 | * - oldc was / itself, or |
1195 | * - oldc was / itself, or |
1189 | * - oldc and newc are equal. |
1196 | * - oldc and newc are equal. |
1190 | */ |
1197 | */ |
1191 | ipc_answer_0(rid, EINVAL); |
1198 | ipc_answer_0(rid, EINVAL); |
1192 | free(old); |
1199 | free(old); |
1193 | free(new); |
1200 | free(new); |
1194 | return; |
1201 | return; |
1195 | } |
1202 | } |
1196 | 1203 | ||
1197 | vfs_lookup_res_t old_lr; |
1204 | vfs_lookup_res_t old_lr; |
1198 | vfs_lookup_res_t new_lr; |
1205 | vfs_lookup_res_t new_lr; |
1199 | vfs_lookup_res_t new_par_lr; |
1206 | vfs_lookup_res_t new_par_lr; |
1200 | fibril_rwlock_write_lock(&namespace_rwlock); |
1207 | fibril_rwlock_write_lock(&namespace_rwlock); |
1201 | /* Lookup the node belonging to the old file name. */ |
1208 | /* Lookup the node belonging to the old file name. */ |
1202 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
1209 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
1203 | if (rc != EOK) { |
1210 | if (rc != EOK) { |
1204 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1211 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1205 | ipc_answer_0(rid, rc); |
1212 | ipc_answer_0(rid, rc); |
1206 | free(old); |
1213 | free(old); |
1207 | free(new); |
1214 | free(new); |
1208 | return; |
1215 | return; |
1209 | } |
1216 | } |
1210 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
1217 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
1211 | if (!old_node) { |
1218 | if (!old_node) { |
1212 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1219 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1213 | ipc_answer_0(rid, ENOMEM); |
1220 | ipc_answer_0(rid, ENOMEM); |
1214 | free(old); |
1221 | free(old); |
1215 | free(new); |
1222 | free(new); |
1216 | return; |
1223 | return; |
1217 | } |
1224 | } |
1218 | /* Determine the path to the parent of the node with the new name. */ |
1225 | /* Determine the path to the parent of the node with the new name. */ |
1219 | char *parentc = str_dup(newc); |
1226 | char *parentc = str_dup(newc); |
1220 | if (!parentc) { |
1227 | if (!parentc) { |
1221 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1228 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1222 | ipc_answer_0(rid, rc); |
1229 | ipc_answer_0(rid, rc); |
1223 | free(old); |
1230 | free(old); |
1224 | free(new); |
1231 | free(new); |
1225 | return; |
1232 | return; |
1226 | } |
1233 | } |
1227 | char *lastsl = str_rchr(parentc + 1, '/'); |
1234 | char *lastsl = str_rchr(parentc + 1, '/'); |
1228 | if (lastsl) |
1235 | if (lastsl) |
1229 | *lastsl = '\0'; |
1236 | *lastsl = '\0'; |
1230 | else |
1237 | else |
1231 | parentc[1] = '\0'; |
1238 | parentc[1] = '\0'; |
1232 | /* Lookup parent of the new file name. */ |
1239 | /* Lookup parent of the new file name. */ |
1233 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
1240 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
1234 | free(parentc); /* not needed anymore */ |
1241 | free(parentc); /* not needed anymore */ |
1235 | if (rc != EOK) { |
1242 | if (rc != EOK) { |
1236 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1243 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1237 | ipc_answer_0(rid, rc); |
1244 | ipc_answer_0(rid, rc); |
1238 | free(old); |
1245 | free(old); |
1239 | free(new); |
1246 | free(new); |
1240 | return; |
1247 | return; |
1241 | } |
1248 | } |
1242 | /* Check whether linking to the same file system instance. */ |
1249 | /* Check whether linking to the same file system instance. */ |
1243 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
1250 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
1244 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
1251 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
1245 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1252 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1246 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
1253 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
1247 | free(old); |
1254 | free(old); |
1248 | free(new); |
1255 | free(new); |
1249 | return; |
1256 | return; |
1250 | } |
1257 | } |
1251 | /* Destroy the old link for the new name. */ |
1258 | /* Destroy the old link for the new name. */ |
1252 | vfs_node_t *new_node = NULL; |
1259 | vfs_node_t *new_node = NULL; |
1253 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
1260 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
1254 | switch (rc) { |
1261 | switch (rc) { |
1255 | case ENOENT: |
1262 | case ENOENT: |
1256 | /* simply not in our way */ |
1263 | /* simply not in our way */ |
1257 | break; |
1264 | break; |
1258 | case EOK: |
1265 | case EOK: |
1259 | new_node = vfs_node_get(&new_lr); |
1266 | new_node = vfs_node_get(&new_lr); |
1260 | if (!new_node) { |
1267 | if (!new_node) { |
1261 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1268 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1262 | ipc_answer_0(rid, ENOMEM); |
1269 | ipc_answer_0(rid, ENOMEM); |
1263 | free(old); |
1270 | free(old); |
1264 | free(new); |
1271 | free(new); |
1265 | return; |
1272 | return; |
1266 | } |
1273 | } |
1267 | futex_down(&nodes_futex); |
1274 | futex_down(&nodes_futex); |
1268 | new_node->lnkcnt--; |
1275 | new_node->lnkcnt--; |
1269 | futex_up(&nodes_futex); |
1276 | futex_up(&nodes_futex); |
1270 | break; |
1277 | break; |
1271 | default: |
1278 | default: |
1272 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1279 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1273 | ipc_answer_0(rid, ENOTEMPTY); |
1280 | ipc_answer_0(rid, ENOTEMPTY); |
1274 | free(old); |
1281 | free(old); |
1275 | free(new); |
1282 | free(new); |
1276 | return; |
1283 | return; |
1277 | } |
1284 | } |
1278 | /* Create the new link for the new name. */ |
1285 | /* Create the new link for the new name. */ |
1279 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
1286 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
1280 | if (rc != EOK) { |
1287 | if (rc != EOK) { |
1281 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1288 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1282 | if (new_node) |
1289 | if (new_node) |
1283 | vfs_node_put(new_node); |
1290 | vfs_node_put(new_node); |
1284 | ipc_answer_0(rid, rc); |
1291 | ipc_answer_0(rid, rc); |
1285 | free(old); |
1292 | free(old); |
1286 | free(new); |
1293 | free(new); |
1287 | return; |
1294 | return; |
1288 | } |
1295 | } |
1289 | futex_down(&nodes_futex); |
1296 | futex_down(&nodes_futex); |
1290 | old_node->lnkcnt++; |
1297 | old_node->lnkcnt++; |
1291 | futex_up(&nodes_futex); |
1298 | futex_up(&nodes_futex); |
1292 | /* Destroy the link for the old name. */ |
1299 | /* Destroy the link for the old name. */ |
1293 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
1300 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
1294 | if (rc != EOK) { |
1301 | if (rc != EOK) { |
1295 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1302 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1296 | vfs_node_put(old_node); |
1303 | vfs_node_put(old_node); |
1297 | if (new_node) |
1304 | if (new_node) |
1298 | vfs_node_put(new_node); |
1305 | vfs_node_put(new_node); |
1299 | ipc_answer_0(rid, rc); |
1306 | ipc_answer_0(rid, rc); |
1300 | free(old); |
1307 | free(old); |
1301 | free(new); |
1308 | free(new); |
1302 | return; |
1309 | return; |
1303 | } |
1310 | } |
1304 | futex_down(&nodes_futex); |
1311 | futex_down(&nodes_futex); |
1305 | old_node->lnkcnt--; |
1312 | old_node->lnkcnt--; |
1306 | futex_up(&nodes_futex); |
1313 | futex_up(&nodes_futex); |
1307 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1314 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1308 | vfs_node_put(old_node); |
1315 | vfs_node_put(old_node); |
1309 | if (new_node) |
1316 | if (new_node) |
1310 | vfs_node_put(new_node); |
1317 | vfs_node_put(new_node); |
1311 | free(old); |
1318 | free(old); |
1312 | free(new); |
1319 | free(new); |
1313 | ipc_answer_0(rid, EOK); |
1320 | ipc_answer_0(rid, EOK); |
1314 | } |
1321 | } |
1315 | 1322 | ||
1316 | /** |
1323 | /** |
1317 | * @} |
1324 | * @} |
1318 | */ |
1325 | */ |
1319 | 1326 |