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| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2008 Jakub Jermar |
2 | * Copyright (c) 2008 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup fs |
29 | /** @addtogroup fs |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | 32 | ||
| 33 | /** |
33 | /** |
| 34 | * @file vfs_ops.c |
34 | * @file vfs_ops.c |
| 35 | * @brief Operations that VFS offers to its clients. |
35 | * @brief Operations that VFS offers to its clients. |
| 36 | */ |
36 | */ |
| 37 | 37 | ||
| 38 | #include "vfs.h" |
38 | #include "vfs.h" |
| 39 | #include <ipc/ipc.h> |
39 | #include <ipc/ipc.h> |
| 40 | #include <async.h> |
40 | #include <async.h> |
| 41 | #include <errno.h> |
41 | #include <errno.h> |
| 42 | #include <stdio.h> |
42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
43 | #include <stdlib.h> |
| 44 | #include <string.h> |
44 | #include <string.h> |
| 45 | #include <bool.h> |
45 | #include <bool.h> |
| 46 | #include <futex.h> |
46 | #include <futex.h> |
| 47 | #include <rwlock.h> |
47 | #include <rwlock.h> |
| 48 | #include <libadt/list.h> |
48 | #include <libadt/list.h> |
| 49 | #include <unistd.h> |
49 | #include <unistd.h> |
| 50 | #include <ctype.h> |
50 | #include <ctype.h> |
| 51 | #include <fcntl.h> |
51 | #include <fcntl.h> |
| 52 | #include <assert.h> |
52 | #include <assert.h> |
| 53 | #include <vfs/canonify.h> |
53 | #include <vfs/canonify.h> |
| 54 | 54 | ||
| 55 | /* Forward declarations of static functions. */ |
55 | /* Forward declarations of static functions. */ |
| 56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
| 57 | 57 | ||
| 58 | /** |
58 | /** |
| 59 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
59 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
| 60 | * concurrent VFS operation which modifies the file system namespace. |
60 | * concurrent VFS operation which modifies the file system namespace. |
| 61 | */ |
61 | */ |
| 62 | RWLOCK_INITIALIZE(namespace_rwlock); |
62 | RWLOCK_INITIALIZE(namespace_rwlock); |
| 63 | 63 | ||
| 64 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
64 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
| 65 | vfs_pair_t rootfs = { |
65 | vfs_pair_t rootfs = { |
| 66 | .fs_handle = 0, |
66 | .fs_handle = 0, |
| 67 | .dev_handle = 0 |
67 | .dev_handle = 0 |
| 68 | }; |
68 | }; |
| 69 | 69 | ||
| 70 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
70 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
| 71 | { |
71 | { |
| 72 | dev_handle_t dev_handle; |
72 | dev_handle_t dev_handle; |
| 73 | vfs_node_t *mp_node = NULL; |
73 | vfs_node_t *mp_node = NULL; |
| 74 | ipc_callid_t callid; |
74 | ipc_callid_t callid; |
| 75 | ipc_call_t data; |
75 | ipc_call_t data; |
| 76 | int rc; |
76 | int rc; |
| 77 | int phone; |
77 | int phone; |
| 78 | size_t size; |
78 | size_t size; |
| 79 | 79 | ||
| 80 | /* |
80 | /* |
| 81 | * We expect the library to do the device-name to device-handle |
81 | * We expect the library to do the device-name to device-handle |
| 82 | * translation for us, thus the device handle will arrive as ARG1 |
82 | * translation for us, thus the device handle will arrive as ARG1 |
| 83 | * in the request. |
83 | * in the request. |
| 84 | */ |
84 | */ |
| 85 | dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
85 | dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
| 86 | 86 | ||
| 87 | /* |
87 | /* |
| 88 | * For now, don't make use of ARG2 and ARG3, but they can be used to |
88 | * For now, don't make use of ARG2 and ARG3, but they can be used to |
| 89 | * carry mount options in the future. |
89 | * carry mount options in the future. |
| 90 | */ |
90 | */ |
| 91 | 91 | ||
| 92 | /* |
92 | /* |
| 93 | * Now, we expect the client to send us data with the name of the file |
93 | * Now, we expect the client to send us data with the name of the file |
| 94 | * system. |
94 | * system. |
| 95 | */ |
95 | */ |
| 96 | if (!ipc_data_write_receive(&callid, &size)) { |
96 | if (!ipc_data_write_receive(&callid, &size)) { |
| 97 | ipc_answer_0(callid, EINVAL); |
97 | ipc_answer_0(callid, EINVAL); |
| 98 | ipc_answer_0(rid, EINVAL); |
98 | ipc_answer_0(rid, EINVAL); |
| 99 | return; |
99 | return; |
| 100 | } |
100 | } |
| 101 | 101 | ||
| 102 | /* |
102 | /* |
| 103 | * Don't receive more than is necessary for storing a full file system |
103 | * Don't receive more than is necessary for storing a full file system |
| 104 | * name. |
104 | * name. |
| 105 | */ |
105 | */ |
| 106 | if (size < 1 || size > FS_NAME_MAXLEN) { |
106 | if (size < 1 || size > FS_NAME_MAXLEN) { |
| 107 | ipc_answer_0(callid, EINVAL); |
107 | ipc_answer_0(callid, EINVAL); |
| 108 | ipc_answer_0(rid, EINVAL); |
108 | ipc_answer_0(rid, EINVAL); |
| 109 | return; |
109 | return; |
| 110 | } |
110 | } |
| 111 | 111 | ||
| 112 | /* Deliver the file system name. */ |
112 | /* Deliver the file system name. */ |
| 113 | char fs_name[FS_NAME_MAXLEN + 1]; |
113 | char fs_name[FS_NAME_MAXLEN + 1]; |
| 114 | (void) ipc_data_write_finalize(callid, fs_name, size); |
114 | (void) ipc_data_write_finalize(callid, fs_name, size); |
| 115 | fs_name[size] = '\0'; |
115 | fs_name[size] = '\0'; |
| 116 | 116 | ||
| 117 | /* |
117 | /* |
| 118 | * Wait for IPC_M_PING so that we can return an error if we don't know |
118 | * Wait for IPC_M_PING so that we can return an error if we don't know |
| 119 | * fs_name. |
119 | * fs_name. |
| 120 | */ |
120 | */ |
| 121 | callid = async_get_call(&data); |
121 | callid = async_get_call(&data); |
| 122 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
122 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
| 123 | ipc_answer_0(callid, ENOTSUP); |
123 | ipc_answer_0(callid, ENOTSUP); |
| 124 | ipc_answer_0(rid, ENOTSUP); |
124 | ipc_answer_0(rid, ENOTSUP); |
| 125 | return; |
125 | return; |
| 126 | } |
126 | } |
| 127 | 127 | ||
| 128 | /* |
128 | /* |
| 129 | * Check if we know a file system with the same name as is in fs_name. |
129 | * Check if we know a file system with the same name as is in fs_name. |
| 130 | * This will also give us its file system handle. |
130 | * This will also give us its file system handle. |
| 131 | */ |
131 | */ |
| 132 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
132 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
| 133 | if (!fs_handle) { |
133 | if (!fs_handle) { |
| 134 | ipc_answer_0(callid, ENOENT); |
134 | ipc_answer_0(callid, ENOENT); |
| 135 | ipc_answer_0(rid, ENOENT); |
135 | ipc_answer_0(rid, ENOENT); |
| 136 | return; |
136 | return; |
| 137 | } |
137 | } |
| 138 | 138 | ||
| 139 | /* Acknowledge that we know fs_name. */ |
139 | /* Acknowledge that we know fs_name. */ |
| 140 | ipc_answer_0(callid, EOK); |
140 | ipc_answer_0(callid, EOK); |
| 141 | 141 | ||
| 142 | /* Now, we want the client to send us the mount point. */ |
142 | /* Now, we want the client to send us the mount point. */ |
| 143 | if (!ipc_data_write_receive(&callid, &size)) { |
143 | if (!ipc_data_write_receive(&callid, &size)) { |
| 144 | ipc_answer_0(callid, EINVAL); |
144 | ipc_answer_0(callid, EINVAL); |
| 145 | ipc_answer_0(rid, EINVAL); |
145 | ipc_answer_0(rid, EINVAL); |
| 146 | return; |
146 | return; |
| 147 | } |
147 | } |
| 148 | 148 | ||
| 149 | /* Check whether size is reasonable wrt. the mount point. */ |
149 | /* Check whether size is reasonable wrt. the mount point. */ |
| 150 | if (size < 1 || size > MAX_PATH_LEN) { |
150 | if (size < 1 || size > MAX_PATH_LEN) { |
| 151 | ipc_answer_0(callid, EINVAL); |
151 | ipc_answer_0(callid, EINVAL); |
| 152 | ipc_answer_0(rid, EINVAL); |
152 | ipc_answer_0(rid, EINVAL); |
| 153 | return; |
153 | return; |
| 154 | } |
154 | } |
| 155 | /* Allocate buffer for the mount point data being received. */ |
155 | /* Allocate buffer for the mount point data being received. */ |
| 156 | char *buf; |
156 | char *buf; |
| 157 | buf = malloc(size + 1); |
157 | buf = malloc(size + 1); |
| 158 | if (!buf) { |
158 | if (!buf) { |
| 159 | ipc_answer_0(callid, ENOMEM); |
159 | ipc_answer_0(callid, ENOMEM); |
| 160 | ipc_answer_0(rid, ENOMEM); |
160 | ipc_answer_0(rid, ENOMEM); |
| 161 | return; |
161 | return; |
| 162 | } |
162 | } |
| 163 | 163 | ||
| 164 | /* Deliver the mount point. */ |
164 | /* Deliver the mount point. */ |
| 165 | (void) ipc_data_write_finalize(callid, buf, size); |
165 | (void) ipc_data_write_finalize(callid, buf, size); |
| 166 | buf[size] = '\0'; |
166 | buf[size] = '\0'; |
| 167 | 167 | ||
| 168 | /* Resolve the path to the mountpoint. */ |
168 | /* Resolve the path to the mountpoint. */ |
| 169 | vfs_lookup_res_t mp_res; |
169 | vfs_lookup_res_t mp_res; |
| 170 | futex_down(&rootfs_futex); |
170 | futex_down(&rootfs_futex); |
| 171 | if (rootfs.fs_handle) { |
171 | if (rootfs.fs_handle) { |
| 172 | /* We already have the root FS. */ |
172 | /* We already have the root FS. */ |
| 173 | rwlock_write_lock(&namespace_rwlock); |
173 | rwlock_write_lock(&namespace_rwlock); |
| 174 | if ((size == 1) && (buf[0] == '/')) { |
174 | if ((size == 1) && (buf[0] == '/')) { |
| 175 | /* Trying to mount root FS over root FS */ |
175 | /* Trying to mount root FS over root FS */ |
| 176 | rwlock_write_unlock(&namespace_rwlock); |
176 | rwlock_write_unlock(&namespace_rwlock); |
| 177 | futex_up(&rootfs_futex); |
177 | futex_up(&rootfs_futex); |
| 178 | free(buf); |
178 | free(buf); |
| 179 | ipc_answer_0(rid, EBUSY); |
179 | ipc_answer_0(rid, EBUSY); |
| 180 | return; |
180 | return; |
| 181 | } |
181 | } |
| 182 | rc = vfs_lookup_internal(buf, L_DIRECTORY, &mp_res, NULL); |
182 | rc = vfs_lookup_internal(buf, L_DIRECTORY, &mp_res, NULL); |
| 183 | if (rc != EOK) { |
183 | if (rc != EOK) { |
| 184 | /* The lookup failed for some reason. */ |
184 | /* The lookup failed for some reason. */ |
| 185 | rwlock_write_unlock(&namespace_rwlock); |
185 | rwlock_write_unlock(&namespace_rwlock); |
| 186 | futex_up(&rootfs_futex); |
186 | futex_up(&rootfs_futex); |
| 187 | free(buf); |
187 | free(buf); |
| 188 | ipc_answer_0(rid, rc); |
188 | ipc_answer_0(rid, rc); |
| 189 | return; |
189 | return; |
| 190 | } |
190 | } |
| 191 | mp_node = vfs_node_get(&mp_res); |
191 | mp_node = vfs_node_get(&mp_res); |
| 192 | if (!mp_node) { |
192 | if (!mp_node) { |
| 193 | rwlock_write_unlock(&namespace_rwlock); |
193 | rwlock_write_unlock(&namespace_rwlock); |
| 194 | futex_up(&rootfs_futex); |
194 | futex_up(&rootfs_futex); |
| 195 | free(buf); |
195 | free(buf); |
| 196 | ipc_answer_0(rid, ENOMEM); |
196 | ipc_answer_0(rid, ENOMEM); |
| 197 | return; |
197 | return; |
| 198 | } |
198 | } |
| 199 | /* |
199 | /* |
| 200 | * Now we hold a reference to mp_node. |
200 | * Now we hold a reference to mp_node. |
| 201 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
201 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
| 202 | * This prevents the mount point from being deleted. |
202 | * This prevents the mount point from being deleted. |
| 203 | */ |
203 | */ |
| 204 | rwlock_write_unlock(&namespace_rwlock); |
204 | rwlock_write_unlock(&namespace_rwlock); |
| 205 | } else { |
205 | } else { |
| 206 | /* We still don't have the root file system mounted. */ |
206 | /* We still don't have the root file system mounted. */ |
| 207 | if ((size == 1) && (buf[0] == '/')) { |
207 | if ((size == 1) && (buf[0] == '/')) { |
| 208 | vfs_lookup_res_t mr_res; |
208 | vfs_lookup_res_t mr_res; |
| 209 | vfs_node_t *mr_node; |
209 | vfs_node_t *mr_node; |
| 210 | ipcarg_t rindex; |
210 | ipcarg_t rindex; |
| 211 | ipcarg_t rsize; |
211 | ipcarg_t rsize; |
| 212 | ipcarg_t rlnkcnt; |
212 | ipcarg_t rlnkcnt; |
| 213 | 213 | ||
| 214 | /* |
214 | /* |
| 215 | * For this simple, but important case, |
215 | * For this simple, but important case, |
| 216 | * we are almost done. |
216 | * we are almost done. |
| 217 | */ |
217 | */ |
| 218 | free(buf); |
218 | free(buf); |
| 219 | 219 | ||
| 220 | /* Tell the mountee that it is being mounted. */ |
220 | /* Tell the mountee that it is being mounted. */ |
| 221 | phone = vfs_grab_phone(fs_handle); |
221 | phone = vfs_grab_phone(fs_handle); |
| 222 | rc = async_req_1_3(phone, VFS_MOUNTED, |
222 | rc = async_req_1_3(phone, VFS_MOUNTED, |
| 223 | (ipcarg_t) dev_handle, &rindex, &rsize, &rlnkcnt); |
223 | (ipcarg_t) dev_handle, &rindex, &rsize, &rlnkcnt); |
| 224 | vfs_release_phone(phone); |
224 | vfs_release_phone(phone); |
| 225 | 225 | ||
| 226 | if (rc != EOK) { |
226 | if (rc != EOK) { |
| 227 | futex_up(&rootfs_futex); |
227 | futex_up(&rootfs_futex); |
| 228 | ipc_answer_0(rid, rc); |
228 | ipc_answer_0(rid, rc); |
| 229 | return; |
229 | return; |
| 230 | } |
230 | } |
| 231 | 231 | ||
| 232 | mr_res.triplet.fs_handle = fs_handle; |
232 | mr_res.triplet.fs_handle = fs_handle; |
| 233 | mr_res.triplet.dev_handle = dev_handle; |
233 | mr_res.triplet.dev_handle = dev_handle; |
| 234 | mr_res.triplet.index = (fs_index_t) rindex; |
234 | mr_res.triplet.index = (fs_index_t) rindex; |
| 235 | mr_res.size = (size_t) rsize; |
235 | mr_res.size = (size_t) rsize; |
| 236 | mr_res.lnkcnt = (unsigned) rlnkcnt; |
236 | mr_res.lnkcnt = (unsigned) rlnkcnt; |
| - | 237 | mr_res.type = VFS_NODE_DIRECTORY; |
|
| 237 | 238 | ||
| 238 | rootfs.fs_handle = fs_handle; |
239 | rootfs.fs_handle = fs_handle; |
| 239 | rootfs.dev_handle = dev_handle; |
240 | rootfs.dev_handle = dev_handle; |
| 240 | futex_up(&rootfs_futex); |
241 | futex_up(&rootfs_futex); |
| 241 | 242 | ||
| 242 | /* Add reference to the mounted root. */ |
243 | /* Add reference to the mounted root. */ |
| 243 | mr_node = vfs_node_get(&mr_res); |
244 | mr_node = vfs_node_get(&mr_res); |
| 244 | assert(mr_node); |
245 | assert(mr_node); |
| 245 | 246 | ||
| 246 | ipc_answer_0(rid, rc); |
247 | ipc_answer_0(rid, rc); |
| 247 | return; |
248 | return; |
| 248 | } else { |
249 | } else { |
| 249 | /* |
250 | /* |
| 250 | * We can't resolve this without the root filesystem |
251 | * We can't resolve this without the root filesystem |
| 251 | * being mounted first. |
252 | * being mounted first. |
| 252 | */ |
253 | */ |
| 253 | futex_up(&rootfs_futex); |
254 | futex_up(&rootfs_futex); |
| 254 | free(buf); |
255 | free(buf); |
| 255 | ipc_answer_0(rid, ENOENT); |
256 | ipc_answer_0(rid, ENOENT); |
| 256 | return; |
257 | return; |
| 257 | } |
258 | } |
| 258 | } |
259 | } |
| 259 | futex_up(&rootfs_futex); |
260 | futex_up(&rootfs_futex); |
| 260 | 261 | ||
| 261 | free(buf); /* The buffer is not needed anymore. */ |
262 | free(buf); /* The buffer is not needed anymore. */ |
| 262 | 263 | ||
| 263 | /* |
264 | /* |
| 264 | * At this point, we have all necessary pieces: file system and device |
265 | * At this point, we have all necessary pieces: file system and device |
| 265 | * handles, and we know the mount point VFS node. |
266 | * handles, and we know the mount point VFS node. |
| 266 | */ |
267 | */ |
| 267 | 268 | ||
| 268 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
269 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
| 269 | rc = async_req_4_0(phone, VFS_MOUNT, |
270 | rc = async_req_4_0(phone, VFS_MOUNT, |
| 270 | (ipcarg_t) mp_res.triplet.dev_handle, |
271 | (ipcarg_t) mp_res.triplet.dev_handle, |
| 271 | (ipcarg_t) mp_res.triplet.index, |
272 | (ipcarg_t) mp_res.triplet.index, |
| 272 | (ipcarg_t) fs_handle, |
273 | (ipcarg_t) fs_handle, |
| 273 | (ipcarg_t) dev_handle); |
274 | (ipcarg_t) dev_handle); |
| 274 | vfs_release_phone(phone); |
275 | vfs_release_phone(phone); |
| 275 | 276 | ||
| 276 | if (rc != EOK) { |
277 | if (rc != EOK) { |
| 277 | /* Mount failed, drop reference to mp_node. */ |
278 | /* Mount failed, drop reference to mp_node. */ |
| 278 | if (mp_node) |
279 | if (mp_node) |
| 279 | vfs_node_put(mp_node); |
280 | vfs_node_put(mp_node); |
| 280 | } |
281 | } |
| 281 | 282 | ||
| 282 | ipc_answer_0(rid, rc); |
283 | ipc_answer_0(rid, rc); |
| 283 | } |
284 | } |
| 284 | 285 | ||
| 285 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
286 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
| 286 | { |
287 | { |
| 287 | if (!vfs_files_init()) { |
288 | if (!vfs_files_init()) { |
| 288 | ipc_answer_0(rid, ENOMEM); |
289 | ipc_answer_0(rid, ENOMEM); |
| 289 | return; |
290 | return; |
| 290 | } |
291 | } |
| 291 | 292 | ||
| 292 | /* |
293 | /* |
| 293 | * The POSIX interface is open(path, oflag, mode). |
294 | * The POSIX interface is open(path, oflag, mode). |
| 294 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
295 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
| 295 | * will need to arrive in another call. |
296 | * will need to arrive in another call. |
| 296 | * |
297 | * |
| 297 | * We also receive one private, non-POSIX set of flags called lflag |
298 | * We also receive one private, non-POSIX set of flags called lflag |
| 298 | * used to pass information to vfs_lookup_internal(). |
299 | * used to pass information to vfs_lookup_internal(). |
| 299 | */ |
300 | */ |
| 300 | int lflag = IPC_GET_ARG1(*request); |
301 | int lflag = IPC_GET_ARG1(*request); |
| 301 | int oflag = IPC_GET_ARG2(*request); |
302 | int oflag = IPC_GET_ARG2(*request); |
| 302 | int mode = IPC_GET_ARG3(*request); |
303 | int mode = IPC_GET_ARG3(*request); |
| 303 | size_t len; |
304 | size_t len; |
| 304 | 305 | ||
| - | 306 | /* |
|
| - | 307 | * Make sure that we are called with exactly one of L_FILE and |
|
| - | 308 | * L_DIRECTORY. |
|
| - | 309 | */ |
|
| - | 310 | if ((lflag & (L_FILE | L_DIRECTORY)) == 0 || |
|
| - | 311 | (lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) { |
|
| - | 312 | ipc_answer_0(rid, EINVAL); |
|
| - | 313 | return; |
|
| - | 314 | } |
|
| - | 315 | ||
| 305 | if (oflag & O_CREAT) |
316 | if (oflag & O_CREAT) |
| 306 | lflag |= L_CREATE; |
317 | lflag |= L_CREATE; |
| 307 | if (oflag & O_EXCL) |
318 | if (oflag & O_EXCL) |
| 308 | lflag |= L_EXCLUSIVE; |
319 | lflag |= L_EXCLUSIVE; |
| 309 | 320 | ||
| 310 | ipc_callid_t callid; |
321 | ipc_callid_t callid; |
| 311 | 322 | ||
| 312 | if (!ipc_data_write_receive(&callid, &len)) { |
323 | if (!ipc_data_write_receive(&callid, &len)) { |
| 313 | ipc_answer_0(callid, EINVAL); |
324 | ipc_answer_0(callid, EINVAL); |
| 314 | ipc_answer_0(rid, EINVAL); |
325 | ipc_answer_0(rid, EINVAL); |
| 315 | return; |
326 | return; |
| 316 | } |
327 | } |
| 317 | char *path = malloc(len + 1); |
328 | char *path = malloc(len + 1); |
| 318 | if (!path) { |
329 | if (!path) { |
| 319 | ipc_answer_0(callid, ENOMEM); |
330 | ipc_answer_0(callid, ENOMEM); |
| 320 | ipc_answer_0(rid, ENOMEM); |
331 | ipc_answer_0(rid, ENOMEM); |
| 321 | return; |
332 | return; |
| 322 | } |
333 | } |
| 323 | int rc; |
334 | int rc; |
| 324 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
335 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 325 | ipc_answer_0(rid, rc); |
336 | ipc_answer_0(rid, rc); |
| 326 | free(path); |
337 | free(path); |
| 327 | return; |
338 | return; |
| 328 | } |
339 | } |
| 329 | path[len] = '\0'; |
340 | path[len] = '\0'; |
| 330 | 341 | ||
| 331 | /* |
342 | /* |
| 332 | * Avoid the race condition in which the file can be deleted before we |
343 | * Avoid the race condition in which the file can be deleted before we |
| 333 | * find/create-and-lock the VFS node corresponding to the looked-up |
344 | * find/create-and-lock the VFS node corresponding to the looked-up |
| 334 | * triplet. |
345 | * triplet. |
| 335 | */ |
346 | */ |
| 336 | if (lflag & L_CREATE) |
347 | if (lflag & L_CREATE) |
| 337 | rwlock_write_lock(&namespace_rwlock); |
348 | rwlock_write_lock(&namespace_rwlock); |
| 338 | else |
349 | else |
| 339 | rwlock_read_lock(&namespace_rwlock); |
350 | rwlock_read_lock(&namespace_rwlock); |
| 340 | 351 | ||
| 341 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
352 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
| 342 | vfs_lookup_res_t lr; |
353 | vfs_lookup_res_t lr; |
| 343 | rc = vfs_lookup_internal(path, lflag, &lr, NULL); |
354 | rc = vfs_lookup_internal(path, lflag, &lr, NULL); |
| 344 | if (rc) { |
355 | if (rc) { |
| 345 | if (lflag & L_CREATE) |
356 | if (lflag & L_CREATE) |
| 346 | rwlock_write_unlock(&namespace_rwlock); |
357 | rwlock_write_unlock(&namespace_rwlock); |
| 347 | else |
358 | else |
| 348 | rwlock_read_unlock(&namespace_rwlock); |
359 | rwlock_read_unlock(&namespace_rwlock); |
| 349 | ipc_answer_0(rid, rc); |
360 | ipc_answer_0(rid, rc); |
| 350 | free(path); |
361 | free(path); |
| 351 | return; |
362 | return; |
| 352 | } |
363 | } |
| 353 | 364 | ||
| 354 | /* Path is no longer needed. */ |
365 | /* Path is no longer needed. */ |
| 355 | free(path); |
366 | free(path); |
| 356 | 367 | ||
| 357 | vfs_node_t *node = vfs_node_get(&lr); |
368 | vfs_node_t *node = vfs_node_get(&lr); |
| 358 | if (lflag & L_CREATE) |
369 | if (lflag & L_CREATE) |
| 359 | rwlock_write_unlock(&namespace_rwlock); |
370 | rwlock_write_unlock(&namespace_rwlock); |
| 360 | else |
371 | else |
| 361 | rwlock_read_unlock(&namespace_rwlock); |
372 | rwlock_read_unlock(&namespace_rwlock); |
| 362 | 373 | ||
| 363 | /* Truncate the file if requested and if necessary. */ |
374 | /* Truncate the file if requested and if necessary. */ |
| 364 | if (oflag & O_TRUNC) { |
375 | if (oflag & O_TRUNC) { |
| 365 | rwlock_write_lock(&node->contents_rwlock); |
376 | rwlock_write_lock(&node->contents_rwlock); |
| 366 | if (node->size) { |
377 | if (node->size) { |
| 367 | rc = vfs_truncate_internal(node->fs_handle, |
378 | rc = vfs_truncate_internal(node->fs_handle, |
| 368 | node->dev_handle, node->index, 0); |
379 | node->dev_handle, node->index, 0); |
| 369 | if (rc) { |
380 | if (rc) { |
| 370 | rwlock_write_unlock(&node->contents_rwlock); |
381 | rwlock_write_unlock(&node->contents_rwlock); |
| 371 | vfs_node_put(node); |
382 | vfs_node_put(node); |
| 372 | ipc_answer_0(rid, rc); |
383 | ipc_answer_0(rid, rc); |
| 373 | return; |
384 | return; |
| 374 | } |
385 | } |
| 375 | node->size = 0; |
386 | node->size = 0; |
| 376 | } |
387 | } |
| 377 | rwlock_write_unlock(&node->contents_rwlock); |
388 | rwlock_write_unlock(&node->contents_rwlock); |
| 378 | } |
389 | } |
| 379 | 390 | ||
| 380 | /* |
391 | /* |
| 381 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
392 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
| 382 | * structure. |
393 | * structure. |
| 383 | */ |
394 | */ |
| 384 | int fd = vfs_fd_alloc(); |
395 | int fd = vfs_fd_alloc(); |
| 385 | if (fd < 0) { |
396 | if (fd < 0) { |
| 386 | vfs_node_put(node); |
397 | vfs_node_put(node); |
| 387 | ipc_answer_0(rid, fd); |
398 | ipc_answer_0(rid, fd); |
| 388 | return; |
399 | return; |
| 389 | } |
400 | } |
| 390 | vfs_file_t *file = vfs_file_get(fd); |
401 | vfs_file_t *file = vfs_file_get(fd); |
| 391 | file->node = node; |
402 | file->node = node; |
| 392 | if (oflag & O_APPEND) |
403 | if (oflag & O_APPEND) |
| 393 | file->append = true; |
404 | file->append = true; |
| 394 | 405 | ||
| 395 | /* |
406 | /* |
| 396 | * The following increase in reference count is for the fact that the |
407 | * The following increase in reference count is for the fact that the |
| 397 | * file is being opened and that a file structure is pointing to it. |
408 | * file is being opened and that a file structure is pointing to it. |
| 398 | * It is necessary so that the file will not disappear when |
409 | * It is necessary so that the file will not disappear when |
| 399 | * vfs_node_put() is called. The reference will be dropped by the |
410 | * vfs_node_put() is called. The reference will be dropped by the |
| 400 | * respective VFS_CLOSE. |
411 | * respective VFS_CLOSE. |
| 401 | */ |
412 | */ |
| 402 | vfs_node_addref(node); |
413 | vfs_node_addref(node); |
| 403 | vfs_node_put(node); |
414 | vfs_node_put(node); |
| 404 | 415 | ||
| 405 | /* Success! Return the new file descriptor to the client. */ |
416 | /* Success! Return the new file descriptor to the client. */ |
| 406 | ipc_answer_1(rid, EOK, fd); |
417 | ipc_answer_1(rid, EOK, fd); |
| 407 | } |
418 | } |
| 408 | 419 | ||
| 409 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
420 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
| 410 | { |
421 | { |
| 411 | int fd = IPC_GET_ARG1(*request); |
422 | int fd = IPC_GET_ARG1(*request); |
| 412 | int rc = vfs_fd_free(fd); |
423 | int rc = vfs_fd_free(fd); |
| 413 | ipc_answer_0(rid, rc); |
424 | ipc_answer_0(rid, rc); |
| 414 | } |
425 | } |
| 415 | 426 | ||
| 416 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
427 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
| 417 | { |
428 | { |
| 418 | 429 | ||
| 419 | /* |
430 | /* |
| 420 | * The following code strongly depends on the fact that the files data |
431 | * The following code strongly depends on the fact that the files data |
| 421 | * structure can be only accessed by a single fibril and all file |
432 | * structure can be only accessed by a single fibril and all file |
| 422 | * operations are serialized (i.e. the reads and writes cannot |
433 | * operations are serialized (i.e. the reads and writes cannot |
| 423 | * interleave and a file cannot be closed while it is being read). |
434 | * interleave and a file cannot be closed while it is being read). |
| 424 | * |
435 | * |
| 425 | * Additional synchronization needs to be added once the table of |
436 | * Additional synchronization needs to be added once the table of |
| 426 | * open files supports parallel access! |
437 | * open files supports parallel access! |
| 427 | */ |
438 | */ |
| 428 | 439 | ||
| 429 | int fd = IPC_GET_ARG1(*request); |
440 | int fd = IPC_GET_ARG1(*request); |
| 430 | 441 | ||
| 431 | /* Lookup the file structure corresponding to the file descriptor. */ |
442 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 432 | vfs_file_t *file = vfs_file_get(fd); |
443 | vfs_file_t *file = vfs_file_get(fd); |
| 433 | if (!file) { |
444 | if (!file) { |
| 434 | ipc_answer_0(rid, ENOENT); |
445 | ipc_answer_0(rid, ENOENT); |
| 435 | return; |
446 | return; |
| 436 | } |
447 | } |
| 437 | 448 | ||
| 438 | /* |
449 | /* |
| 439 | * Now we need to receive a call with client's |
450 | * Now we need to receive a call with client's |
| 440 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
451 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
| 441 | */ |
452 | */ |
| 442 | ipc_callid_t callid; |
453 | ipc_callid_t callid; |
| 443 | int res; |
454 | int res; |
| 444 | if (read) |
455 | if (read) |
| 445 | res = ipc_data_read_receive(&callid, NULL); |
456 | res = ipc_data_read_receive(&callid, NULL); |
| 446 | else |
457 | else |
| 447 | res = ipc_data_write_receive(&callid, NULL); |
458 | res = ipc_data_write_receive(&callid, NULL); |
| 448 | if (!res) { |
459 | if (!res) { |
| 449 | ipc_answer_0(callid, EINVAL); |
460 | ipc_answer_0(callid, EINVAL); |
| 450 | ipc_answer_0(rid, EINVAL); |
461 | ipc_answer_0(rid, EINVAL); |
| 451 | return; |
462 | return; |
| 452 | } |
463 | } |
| 453 | 464 | ||
| 454 | /* |
465 | /* |
| 455 | * Lock the open file structure so that no other thread can manipulate |
466 | * Lock the open file structure so that no other thread can manipulate |
| 456 | * the same open file at a time. |
467 | * the same open file at a time. |
| 457 | */ |
468 | */ |
| 458 | futex_down(&file->lock); |
469 | futex_down(&file->lock); |
| 459 | 470 | ||
| 460 | /* |
471 | /* |
| 461 | * Lock the file's node so that no other client can read/write to it at |
472 | * Lock the file's node so that no other client can read/write to it at |
| 462 | * the same time. |
473 | * the same time. |
| 463 | */ |
474 | */ |
| 464 | if (read) |
475 | if (read) |
| 465 | rwlock_read_lock(&file->node->contents_rwlock); |
476 | rwlock_read_lock(&file->node->contents_rwlock); |
| 466 | else |
477 | else |
| 467 | rwlock_write_lock(&file->node->contents_rwlock); |
478 | rwlock_write_lock(&file->node->contents_rwlock); |
| - | 479 | ||
| - | 480 | if (file->node->type == VFS_NODE_DIRECTORY) { |
|
| - | 481 | /* |
|
| - | 482 | * Make sure that no one is modifying the namespace |
|
| - | 483 | * while we are in readdir(). |
|
| - | 484 | */ |
|
| - | 485 | assert(read); |
|
| - | 486 | rwlock_read_lock(&namespace_rwlock); |
|
| - | 487 | } |
|
| 468 | 488 | ||
| 469 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
489 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
| 470 | 490 | ||
| 471 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
491 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
| 472 | aid_t msg; |
492 | aid_t msg; |
| 473 | ipc_call_t answer; |
493 | ipc_call_t answer; |
| 474 | if (!read && file->append) |
494 | if (!read && file->append) |
| 475 | file->pos = file->node->size; |
495 | file->pos = file->node->size; |
| 476 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
496 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
| 477 | file->node->dev_handle, file->node->index, file->pos, &answer); |
497 | file->node->dev_handle, file->node->index, file->pos, &answer); |
| 478 | 498 | ||
| 479 | /* |
499 | /* |
| 480 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
500 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
| 481 | * destination FS server. The call will be routed as if sent by |
501 | * destination FS server. The call will be routed as if sent by |
| 482 | * ourselves. Note that call arguments are immutable in this case so we |
502 | * ourselves. Note that call arguments are immutable in this case so we |
| 483 | * don't have to bother. |
503 | * don't have to bother. |
| 484 | */ |
504 | */ |
| 485 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
505 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
| 486 | 506 | ||
| 487 | vfs_release_phone(fs_phone); |
507 | vfs_release_phone(fs_phone); |
| 488 | 508 | ||
| 489 | /* Wait for reply from the FS server. */ |
509 | /* Wait for reply from the FS server. */ |
| 490 | ipcarg_t rc; |
510 | ipcarg_t rc; |
| 491 | async_wait_for(msg, &rc); |
511 | async_wait_for(msg, &rc); |
| 492 | size_t bytes = IPC_GET_ARG1(answer); |
512 | size_t bytes = IPC_GET_ARG1(answer); |
| - | 513 | ||
| - | 514 | if (file->node->type == VFS_NODE_DIRECTORY) |
|
| - | 515 | rwlock_read_unlock(&namespace_rwlock); |
|
| 493 | 516 | ||
| 494 | /* Unlock the VFS node. */ |
517 | /* Unlock the VFS node. */ |
| 495 | if (read) |
518 | if (read) |
| 496 | rwlock_read_unlock(&file->node->contents_rwlock); |
519 | rwlock_read_unlock(&file->node->contents_rwlock); |
| 497 | else { |
520 | else { |
| 498 | /* Update the cached version of node's size. */ |
521 | /* Update the cached version of node's size. */ |
| 499 | if (rc == EOK) |
522 | if (rc == EOK) |
| 500 | file->node->size = IPC_GET_ARG2(answer); |
523 | file->node->size = IPC_GET_ARG2(answer); |
| 501 | rwlock_write_unlock(&file->node->contents_rwlock); |
524 | rwlock_write_unlock(&file->node->contents_rwlock); |
| 502 | } |
525 | } |
| 503 | 526 | ||
| 504 | /* Update the position pointer and unlock the open file. */ |
527 | /* Update the position pointer and unlock the open file. */ |
| 505 | if (rc == EOK) |
528 | if (rc == EOK) |
| 506 | file->pos += bytes; |
529 | file->pos += bytes; |
| 507 | futex_up(&file->lock); |
530 | futex_up(&file->lock); |
| 508 | 531 | ||
| 509 | /* |
532 | /* |
| 510 | * FS server's reply is the final result of the whole operation we |
533 | * FS server's reply is the final result of the whole operation we |
| 511 | * return to the client. |
534 | * return to the client. |
| 512 | */ |
535 | */ |
| 513 | ipc_answer_1(rid, rc, bytes); |
536 | ipc_answer_1(rid, rc, bytes); |
| 514 | } |
537 | } |
| 515 | 538 | ||
| 516 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
539 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
| 517 | { |
540 | { |
| 518 | vfs_rdwr(rid, request, true); |
541 | vfs_rdwr(rid, request, true); |
| 519 | } |
542 | } |
| 520 | 543 | ||
| 521 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
544 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
| 522 | { |
545 | { |
| 523 | vfs_rdwr(rid, request, false); |
546 | vfs_rdwr(rid, request, false); |
| 524 | } |
547 | } |
| 525 | 548 | ||
| 526 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
549 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
| 527 | { |
550 | { |
| 528 | int fd = (int) IPC_GET_ARG1(*request); |
551 | int fd = (int) IPC_GET_ARG1(*request); |
| 529 | off_t off = (off_t) IPC_GET_ARG2(*request); |
552 | off_t off = (off_t) IPC_GET_ARG2(*request); |
| 530 | int whence = (int) IPC_GET_ARG3(*request); |
553 | int whence = (int) IPC_GET_ARG3(*request); |
| 531 | 554 | ||
| 532 | 555 | ||
| 533 | /* Lookup the file structure corresponding to the file descriptor. */ |
556 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 534 | vfs_file_t *file = vfs_file_get(fd); |
557 | vfs_file_t *file = vfs_file_get(fd); |
| 535 | if (!file) { |
558 | if (!file) { |
| 536 | ipc_answer_0(rid, ENOENT); |
559 | ipc_answer_0(rid, ENOENT); |
| 537 | return; |
560 | return; |
| 538 | } |
561 | } |
| 539 | 562 | ||
| 540 | off_t newpos; |
563 | off_t newpos; |
| 541 | futex_down(&file->lock); |
564 | futex_down(&file->lock); |
| 542 | if (whence == SEEK_SET) { |
565 | if (whence == SEEK_SET) { |
| 543 | file->pos = off; |
566 | file->pos = off; |
| 544 | futex_up(&file->lock); |
567 | futex_up(&file->lock); |
| 545 | ipc_answer_1(rid, EOK, off); |
568 | ipc_answer_1(rid, EOK, off); |
| 546 | return; |
569 | return; |
| 547 | } |
570 | } |
| 548 | if (whence == SEEK_CUR) { |
571 | if (whence == SEEK_CUR) { |
| 549 | if (file->pos + off < file->pos) { |
572 | if (file->pos + off < file->pos) { |
| 550 | futex_up(&file->lock); |
573 | futex_up(&file->lock); |
| 551 | ipc_answer_0(rid, EOVERFLOW); |
574 | ipc_answer_0(rid, EOVERFLOW); |
| 552 | return; |
575 | return; |
| 553 | } |
576 | } |
| 554 | file->pos += off; |
577 | file->pos += off; |
| 555 | newpos = file->pos; |
578 | newpos = file->pos; |
| 556 | futex_up(&file->lock); |
579 | futex_up(&file->lock); |
| 557 | ipc_answer_1(rid, EOK, newpos); |
580 | ipc_answer_1(rid, EOK, newpos); |
| 558 | return; |
581 | return; |
| 559 | } |
582 | } |
| 560 | if (whence == SEEK_END) { |
583 | if (whence == SEEK_END) { |
| 561 | rwlock_read_lock(&file->node->contents_rwlock); |
584 | rwlock_read_lock(&file->node->contents_rwlock); |
| 562 | size_t size = file->node->size; |
585 | size_t size = file->node->size; |
| 563 | rwlock_read_unlock(&file->node->contents_rwlock); |
586 | rwlock_read_unlock(&file->node->contents_rwlock); |
| 564 | if (size + off < size) { |
587 | if (size + off < size) { |
| 565 | futex_up(&file->lock); |
588 | futex_up(&file->lock); |
| 566 | ipc_answer_0(rid, EOVERFLOW); |
589 | ipc_answer_0(rid, EOVERFLOW); |
| 567 | return; |
590 | return; |
| 568 | } |
591 | } |
| 569 | newpos = size + off; |
592 | newpos = size + off; |
| 570 | futex_up(&file->lock); |
593 | futex_up(&file->lock); |
| 571 | ipc_answer_1(rid, EOK, newpos); |
594 | ipc_answer_1(rid, EOK, newpos); |
| 572 | return; |
595 | return; |
| 573 | } |
596 | } |
| 574 | futex_up(&file->lock); |
597 | futex_up(&file->lock); |
| 575 | ipc_answer_0(rid, EINVAL); |
598 | ipc_answer_0(rid, EINVAL); |
| 576 | } |
599 | } |
| 577 | 600 | ||
| 578 | int |
601 | int |
| 579 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
602 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
| 580 | fs_index_t index, size_t size) |
603 | fs_index_t index, size_t size) |
| 581 | { |
604 | { |
| 582 | ipcarg_t rc; |
605 | ipcarg_t rc; |
| 583 | int fs_phone; |
606 | int fs_phone; |
| 584 | 607 | ||
| 585 | fs_phone = vfs_grab_phone(fs_handle); |
608 | fs_phone = vfs_grab_phone(fs_handle); |
| 586 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
609 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
| 587 | (ipcarg_t)index, (ipcarg_t)size); |
610 | (ipcarg_t)index, (ipcarg_t)size); |
| 588 | vfs_release_phone(fs_phone); |
611 | vfs_release_phone(fs_phone); |
| 589 | return (int)rc; |
612 | return (int)rc; |
| 590 | } |
613 | } |
| 591 | 614 | ||
| 592 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
615 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
| 593 | { |
616 | { |
| 594 | int fd = IPC_GET_ARG1(*request); |
617 | int fd = IPC_GET_ARG1(*request); |
| 595 | size_t size = IPC_GET_ARG2(*request); |
618 | size_t size = IPC_GET_ARG2(*request); |
| 596 | int rc; |
619 | int rc; |
| 597 | 620 | ||
| 598 | vfs_file_t *file = vfs_file_get(fd); |
621 | vfs_file_t *file = vfs_file_get(fd); |
| 599 | if (!file) { |
622 | if (!file) { |
| 600 | ipc_answer_0(rid, ENOENT); |
623 | ipc_answer_0(rid, ENOENT); |
| 601 | return; |
624 | return; |
| 602 | } |
625 | } |
| 603 | futex_down(&file->lock); |
626 | futex_down(&file->lock); |
| 604 | 627 | ||
| 605 | rwlock_write_lock(&file->node->contents_rwlock); |
628 | rwlock_write_lock(&file->node->contents_rwlock); |
| 606 | rc = vfs_truncate_internal(file->node->fs_handle, |
629 | rc = vfs_truncate_internal(file->node->fs_handle, |
| 607 | file->node->dev_handle, file->node->index, size); |
630 | file->node->dev_handle, file->node->index, size); |
| 608 | if (rc == EOK) |
631 | if (rc == EOK) |
| 609 | file->node->size = size; |
632 | file->node->size = size; |
| 610 | rwlock_write_unlock(&file->node->contents_rwlock); |
633 | rwlock_write_unlock(&file->node->contents_rwlock); |
| 611 | 634 | ||
| 612 | futex_up(&file->lock); |
635 | futex_up(&file->lock); |
| 613 | ipc_answer_0(rid, (ipcarg_t)rc); |
636 | ipc_answer_0(rid, (ipcarg_t)rc); |
| 614 | } |
637 | } |
| 615 | 638 | ||
| 616 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
639 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
| 617 | { |
640 | { |
| 618 | int mode = IPC_GET_ARG1(*request); |
641 | int mode = IPC_GET_ARG1(*request); |
| 619 | 642 | ||
| 620 | size_t len; |
643 | size_t len; |
| 621 | ipc_callid_t callid; |
644 | ipc_callid_t callid; |
| 622 | 645 | ||
| 623 | if (!ipc_data_write_receive(&callid, &len)) { |
646 | if (!ipc_data_write_receive(&callid, &len)) { |
| 624 | ipc_answer_0(callid, EINVAL); |
647 | ipc_answer_0(callid, EINVAL); |
| 625 | ipc_answer_0(rid, EINVAL); |
648 | ipc_answer_0(rid, EINVAL); |
| 626 | return; |
649 | return; |
| 627 | } |
650 | } |
| 628 | char *path = malloc(len + 1); |
651 | char *path = malloc(len + 1); |
| 629 | if (!path) { |
652 | if (!path) { |
| 630 | ipc_answer_0(callid, ENOMEM); |
653 | ipc_answer_0(callid, ENOMEM); |
| 631 | ipc_answer_0(rid, ENOMEM); |
654 | ipc_answer_0(rid, ENOMEM); |
| 632 | return; |
655 | return; |
| 633 | } |
656 | } |
| 634 | int rc; |
657 | int rc; |
| 635 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
658 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 636 | ipc_answer_0(rid, rc); |
659 | ipc_answer_0(rid, rc); |
| 637 | free(path); |
660 | free(path); |
| 638 | return; |
661 | return; |
| 639 | } |
662 | } |
| 640 | path[len] = '\0'; |
663 | path[len] = '\0'; |
| 641 | 664 | ||
| 642 | rwlock_write_lock(&namespace_rwlock); |
665 | rwlock_write_lock(&namespace_rwlock); |
| 643 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
666 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
| 644 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
667 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
| 645 | rwlock_write_unlock(&namespace_rwlock); |
668 | rwlock_write_unlock(&namespace_rwlock); |
| 646 | free(path); |
669 | free(path); |
| 647 | ipc_answer_0(rid, rc); |
670 | ipc_answer_0(rid, rc); |
| 648 | } |
671 | } |
| 649 | 672 | ||
| 650 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
673 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
| 651 | { |
674 | { |
| 652 | int lflag = IPC_GET_ARG1(*request); |
675 | int lflag = IPC_GET_ARG1(*request); |
| 653 | 676 | ||
| 654 | size_t len; |
677 | size_t len; |
| 655 | ipc_callid_t callid; |
678 | ipc_callid_t callid; |
| 656 | 679 | ||
| 657 | if (!ipc_data_write_receive(&callid, &len)) { |
680 | if (!ipc_data_write_receive(&callid, &len)) { |
| 658 | ipc_answer_0(callid, EINVAL); |
681 | ipc_answer_0(callid, EINVAL); |
| 659 | ipc_answer_0(rid, EINVAL); |
682 | ipc_answer_0(rid, EINVAL); |
| 660 | return; |
683 | return; |
| 661 | } |
684 | } |
| 662 | char *path = malloc(len + 1); |
685 | char *path = malloc(len + 1); |
| 663 | if (!path) { |
686 | if (!path) { |
| 664 | ipc_answer_0(callid, ENOMEM); |
687 | ipc_answer_0(callid, ENOMEM); |
| 665 | ipc_answer_0(rid, ENOMEM); |
688 | ipc_answer_0(rid, ENOMEM); |
| 666 | return; |
689 | return; |
| 667 | } |
690 | } |
| 668 | int rc; |
691 | int rc; |
| 669 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
692 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 670 | ipc_answer_0(rid, rc); |
693 | ipc_answer_0(rid, rc); |
| 671 | free(path); |
694 | free(path); |
| 672 | return; |
695 | return; |
| 673 | } |
696 | } |
| 674 | path[len] = '\0'; |
697 | path[len] = '\0'; |
| 675 | 698 | ||
| 676 | rwlock_write_lock(&namespace_rwlock); |
699 | rwlock_write_lock(&namespace_rwlock); |
| 677 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
700 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
| 678 | vfs_lookup_res_t lr; |
701 | vfs_lookup_res_t lr; |
| 679 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
702 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
| 680 | free(path); |
703 | free(path); |
| 681 | if (rc != EOK) { |
704 | if (rc != EOK) { |
| 682 | rwlock_write_unlock(&namespace_rwlock); |
705 | rwlock_write_unlock(&namespace_rwlock); |
| 683 | ipc_answer_0(rid, rc); |
706 | ipc_answer_0(rid, rc); |
| 684 | return; |
707 | return; |
| 685 | } |
708 | } |
| 686 | 709 | ||
| 687 | /* |
710 | /* |
| 688 | * The name has already been unlinked by vfs_lookup_internal(). |
711 | * The name has already been unlinked by vfs_lookup_internal(). |
| 689 | * We have to get and put the VFS node to ensure that it is |
712 | * We have to get and put the VFS node to ensure that it is |
| 690 | * VFS_DESTROY'ed after the last reference to it is dropped. |
713 | * VFS_DESTROY'ed after the last reference to it is dropped. |
| 691 | */ |
714 | */ |
| 692 | vfs_node_t *node = vfs_node_get(&lr); |
715 | vfs_node_t *node = vfs_node_get(&lr); |
| 693 | futex_down(&nodes_futex); |
716 | futex_down(&nodes_futex); |
| 694 | node->lnkcnt--; |
717 | node->lnkcnt--; |
| 695 | futex_up(&nodes_futex); |
718 | futex_up(&nodes_futex); |
| 696 | rwlock_write_unlock(&namespace_rwlock); |
719 | rwlock_write_unlock(&namespace_rwlock); |
| 697 | vfs_node_put(node); |
720 | vfs_node_put(node); |
| 698 | ipc_answer_0(rid, EOK); |
721 | ipc_answer_0(rid, EOK); |
| 699 | } |
722 | } |
| 700 | 723 | ||
| 701 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
724 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
| 702 | { |
725 | { |
| 703 | size_t len; |
726 | size_t len; |
| 704 | ipc_callid_t callid; |
727 | ipc_callid_t callid; |
| 705 | int rc; |
728 | int rc; |
| 706 | 729 | ||
| 707 | /* Retrieve the old path. */ |
730 | /* Retrieve the old path. */ |
| 708 | if (!ipc_data_write_receive(&callid, &len)) { |
731 | if (!ipc_data_write_receive(&callid, &len)) { |
| 709 | ipc_answer_0(callid, EINVAL); |
732 | ipc_answer_0(callid, EINVAL); |
| 710 | ipc_answer_0(rid, EINVAL); |
733 | ipc_answer_0(rid, EINVAL); |
| 711 | return; |
734 | return; |
| 712 | } |
735 | } |
| 713 | char *old = malloc(len + 1); |
736 | char *old = malloc(len + 1); |
| 714 | if (!old) { |
737 | if (!old) { |
| 715 | ipc_answer_0(callid, ENOMEM); |
738 | ipc_answer_0(callid, ENOMEM); |
| 716 | ipc_answer_0(rid, ENOMEM); |
739 | ipc_answer_0(rid, ENOMEM); |
| 717 | return; |
740 | return; |
| 718 | } |
741 | } |
| 719 | if ((rc = ipc_data_write_finalize(callid, old, len))) { |
742 | if ((rc = ipc_data_write_finalize(callid, old, len))) { |
| 720 | ipc_answer_0(rid, rc); |
743 | ipc_answer_0(rid, rc); |
| 721 | free(old); |
744 | free(old); |
| 722 | return; |
745 | return; |
| 723 | } |
746 | } |
| 724 | old[len] = '\0'; |
747 | old[len] = '\0'; |
| 725 | 748 | ||
| 726 | /* Retrieve the new path. */ |
749 | /* Retrieve the new path. */ |
| 727 | if (!ipc_data_write_receive(&callid, &len)) { |
750 | if (!ipc_data_write_receive(&callid, &len)) { |
| 728 | ipc_answer_0(callid, EINVAL); |
751 | ipc_answer_0(callid, EINVAL); |
| 729 | ipc_answer_0(rid, EINVAL); |
752 | ipc_answer_0(rid, EINVAL); |
| 730 | free(old); |
753 | free(old); |
| 731 | return; |
754 | return; |
| 732 | } |
755 | } |
| 733 | char *new = malloc(len + 1); |
756 | char *new = malloc(len + 1); |
| 734 | if (!new) { |
757 | if (!new) { |
| 735 | ipc_answer_0(callid, ENOMEM); |
758 | ipc_answer_0(callid, ENOMEM); |
| 736 | ipc_answer_0(rid, ENOMEM); |
759 | ipc_answer_0(rid, ENOMEM); |
| 737 | free(old); |
760 | free(old); |
| 738 | return; |
761 | return; |
| 739 | } |
762 | } |
| 740 | if ((rc = ipc_data_write_finalize(callid, new, len))) { |
763 | if ((rc = ipc_data_write_finalize(callid, new, len))) { |
| 741 | ipc_answer_0(rid, rc); |
764 | ipc_answer_0(rid, rc); |
| 742 | free(old); |
765 | free(old); |
| 743 | free(new); |
766 | free(new); |
| 744 | return; |
767 | return; |
| 745 | } |
768 | } |
| 746 | new[len] = '\0'; |
769 | new[len] = '\0'; |
| 747 | 770 | ||
| 748 | char *oldc = canonify(old, &len); |
771 | char *oldc = canonify(old, &len); |
| 749 | char *newc = canonify(new, NULL); |
772 | char *newc = canonify(new, NULL); |
| 750 | if (!oldc || !newc) { |
773 | if (!oldc || !newc) { |
| 751 | ipc_answer_0(rid, EINVAL); |
774 | ipc_answer_0(rid, EINVAL); |
| 752 | free(old); |
775 | free(old); |
| 753 | free(new); |
776 | free(new); |
| 754 | return; |
777 | return; |
| 755 | } |
778 | } |
| 756 | if (!strncmp(newc, oldc, len)) { |
779 | if (!strncmp(newc, oldc, len)) { |
| 757 | /* oldc is a prefix of newc */ |
780 | /* oldc is a prefix of newc */ |
| 758 | ipc_answer_0(rid, EINVAL); |
781 | ipc_answer_0(rid, EINVAL); |
| 759 | free(old); |
782 | free(old); |
| 760 | free(new); |
783 | free(new); |
| 761 | return; |
784 | return; |
| 762 | } |
785 | } |
| 763 | 786 | ||
| 764 | vfs_lookup_res_t old_lr; |
787 | vfs_lookup_res_t old_lr; |
| 765 | vfs_lookup_res_t new_lr; |
788 | vfs_lookup_res_t new_lr; |
| 766 | vfs_lookup_res_t new_par_lr; |
789 | vfs_lookup_res_t new_par_lr; |
| 767 | rwlock_write_lock(&namespace_rwlock); |
790 | rwlock_write_lock(&namespace_rwlock); |
| 768 | /* Lookup the node belonging to the old file name. */ |
791 | /* Lookup the node belonging to the old file name. */ |
| 769 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
792 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
| 770 | if (rc != EOK) { |
793 | if (rc != EOK) { |
| 771 | rwlock_write_unlock(&namespace_rwlock); |
794 | rwlock_write_unlock(&namespace_rwlock); |
| 772 | ipc_answer_0(rid, rc); |
795 | ipc_answer_0(rid, rc); |
| 773 | free(old); |
796 | free(old); |
| 774 | free(new); |
797 | free(new); |
| 775 | return; |
798 | return; |
| 776 | } |
799 | } |
| 777 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
800 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
| 778 | if (!old_node) { |
801 | if (!old_node) { |
| 779 | rwlock_write_unlock(&namespace_rwlock); |
802 | rwlock_write_unlock(&namespace_rwlock); |
| 780 | ipc_answer_0(rid, ENOMEM); |
803 | ipc_answer_0(rid, ENOMEM); |
| 781 | free(old); |
804 | free(old); |
| 782 | free(new); |
805 | free(new); |
| 783 | return; |
806 | return; |
| 784 | } |
807 | } |
| 785 | /* Lookup parent of the new file name. */ |
808 | /* Lookup parent of the new file name. */ |
| 786 | rc = vfs_lookup_internal(newc, L_PARENT, &new_par_lr, NULL); |
809 | rc = vfs_lookup_internal(newc, L_PARENT, &new_par_lr, NULL); |
| 787 | if (rc != EOK) { |
810 | if (rc != EOK) { |
| 788 | rwlock_write_unlock(&namespace_rwlock); |
811 | rwlock_write_unlock(&namespace_rwlock); |
| 789 | ipc_answer_0(rid, rc); |
812 | ipc_answer_0(rid, rc); |
| 790 | free(old); |
813 | free(old); |
| 791 | free(new); |
814 | free(new); |
| 792 | return; |
815 | return; |
| 793 | } |
816 | } |
| 794 | /* Check whether linking to the same file system instance. */ |
817 | /* Check whether linking to the same file system instance. */ |
| 795 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
818 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
| 796 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
819 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
| 797 | rwlock_write_unlock(&namespace_rwlock); |
820 | rwlock_write_unlock(&namespace_rwlock); |
| 798 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
821 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
| 799 | free(old); |
822 | free(old); |
| 800 | free(new); |
823 | free(new); |
| 801 | return; |
824 | return; |
| 802 | } |
825 | } |
| 803 | /* Destroy the old link for the new name. */ |
826 | /* Destroy the old link for the new name. */ |
| 804 | vfs_node_t *new_node = NULL; |
827 | vfs_node_t *new_node = NULL; |
| 805 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
828 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
| 806 | switch (rc) { |
829 | switch (rc) { |
| 807 | case ENOENT: |
830 | case ENOENT: |
| 808 | /* simply not in our way */ |
831 | /* simply not in our way */ |
| 809 | break; |
832 | break; |
| 810 | case EOK: |
833 | case EOK: |
| 811 | new_node = vfs_node_get(&new_lr); |
834 | new_node = vfs_node_get(&new_lr); |
| 812 | if (!new_node) { |
835 | if (!new_node) { |
| 813 | rwlock_write_unlock(&namespace_rwlock); |
836 | rwlock_write_unlock(&namespace_rwlock); |
| 814 | ipc_answer_0(rid, ENOMEM); |
837 | ipc_answer_0(rid, ENOMEM); |
| 815 | free(old); |
838 | free(old); |
| 816 | free(new); |
839 | free(new); |
| 817 | return; |
840 | return; |
| 818 | } |
841 | } |
| 819 | futex_down(&nodes_futex); |
842 | futex_down(&nodes_futex); |
| 820 | new_node->lnkcnt--; |
843 | new_node->lnkcnt--; |
| 821 | futex_up(&nodes_futex); |
844 | futex_up(&nodes_futex); |
| 822 | break; |
845 | break; |
| 823 | default: |
846 | default: |
| 824 | rwlock_write_unlock(&namespace_rwlock); |
847 | rwlock_write_unlock(&namespace_rwlock); |
| 825 | ipc_answer_0(rid, ENOTEMPTY); |
848 | ipc_answer_0(rid, ENOTEMPTY); |
| 826 | free(old); |
849 | free(old); |
| 827 | free(new); |
850 | free(new); |
| 828 | return; |
851 | return; |
| 829 | } |
852 | } |
| 830 | /* Create the new link for the new name. */ |
853 | /* Create the new link for the new name. */ |
| 831 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
854 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
| 832 | if (rc != EOK) { |
855 | if (rc != EOK) { |
| 833 | rwlock_write_unlock(&namespace_rwlock); |
856 | rwlock_write_unlock(&namespace_rwlock); |
| 834 | if (new_node) |
857 | if (new_node) |
| 835 | vfs_node_put(new_node); |
858 | vfs_node_put(new_node); |
| 836 | ipc_answer_0(rid, rc); |
859 | ipc_answer_0(rid, rc); |
| 837 | free(old); |
860 | free(old); |
| 838 | free(new); |
861 | free(new); |
| 839 | return; |
862 | return; |
| 840 | } |
863 | } |
| 841 | futex_down(&nodes_futex); |
864 | futex_down(&nodes_futex); |
| 842 | old_node->lnkcnt++; |
865 | old_node->lnkcnt++; |
| 843 | futex_up(&nodes_futex); |
866 | futex_up(&nodes_futex); |
| 844 | /* Destroy the link for the old name. */ |
867 | /* Destroy the link for the old name. */ |
| 845 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
868 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
| 846 | if (rc != EOK) { |
869 | if (rc != EOK) { |
| 847 | rwlock_write_unlock(&namespace_rwlock); |
870 | rwlock_write_unlock(&namespace_rwlock); |
| 848 | vfs_node_put(old_node); |
871 | vfs_node_put(old_node); |
| 849 | if (new_node) |
872 | if (new_node) |
| 850 | vfs_node_put(new_node); |
873 | vfs_node_put(new_node); |
| 851 | ipc_answer_0(rid, rc); |
874 | ipc_answer_0(rid, rc); |
| 852 | free(old); |
875 | free(old); |
| 853 | free(new); |
876 | free(new); |
| 854 | return; |
877 | return; |
| 855 | } |
878 | } |
| 856 | futex_down(&nodes_futex); |
879 | futex_down(&nodes_futex); |
| 857 | old_node->lnkcnt--; |
880 | old_node->lnkcnt--; |
| 858 | futex_up(&nodes_futex); |
881 | futex_up(&nodes_futex); |
| 859 | rwlock_write_unlock(&namespace_rwlock); |
882 | rwlock_write_unlock(&namespace_rwlock); |
| 860 | vfs_node_put(old_node); |
883 | vfs_node_put(old_node); |
| 861 | if (new_node) |
884 | if (new_node) |
| 862 | vfs_node_put(new_node); |
885 | vfs_node_put(new_node); |
| 863 | free(old); |
886 | free(old); |
| 864 | free(new); |
887 | free(new); |
| 865 | ipc_answer_0(rid, EOK); |
888 | ipc_answer_0(rid, EOK); |
| 866 | } |
889 | } |
| 867 | 890 | ||
| 868 | /** |
891 | /** |
| 869 | * @} |
892 | * @} |
| 870 | */ |
893 | */ |
| 871 | 894 | ||