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Rev 3022 | Rev 4055 | ||
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Line 26... | Line 26... | ||
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> |
Line 53... | Line 53... | ||
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. */ |
|
- | 59 | typedef struct { |
|
- | 60 | link_t link; |
|
- | 61 | char *fs_name; /**< File system name */ |
|
- | 62 | char *mp; /**< Mount point */ |
|
- | 63 | ipc_callid_t callid; /**< Call ID waiting for the mount */ |
|
- | 64 | ipc_callid_t rid; /**< Request ID */ |
|
- | 65 | dev_handle_t dev_handle; /**< Device handle */ |
|
- | 66 | } pending_req_t; |
|
- | 67 | ||
- | 68 | LIST_INITIALIZE(pending_req); |
|
- | 69 | ||
58 | /** |
70 | /** |
59 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
71 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
60 | * concurrent VFS operation which modifies the file system namespace. |
72 | * concurrent VFS operation which modifies the file system namespace. |
61 | */ |
73 | */ |
62 | RWLOCK_INITIALIZE(namespace_rwlock); |
74 | RWLOCK_INITIALIZE(namespace_rwlock); |
63 | 75 | ||
64 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
76 | futex_t rootfs_futex = FUTEX_INITIALIZER; |
65 | vfs_triplet_t rootfs = { |
77 | vfs_pair_t rootfs = { |
66 | .fs_handle = 0, |
78 | .fs_handle = 0, |
67 | .dev_handle = 0, |
79 | .dev_handle = 0 |
68 | .index = 0, |
- | |
69 | }; |
80 | }; |
70 | 81 | ||
71 | static int |
- | |
72 | lookup_root(fs_handle_t fs_handle, dev_handle_t dev_handle, |
82 | static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle, |
73 | vfs_lookup_res_t *result) |
- | |
74 | { |
- | |
75 | vfs_pair_t altroot = { |
- | |
76 | .fs_handle = fs_handle, |
83 | fs_handle_t fs_handle, char *mp) |
77 | .dev_handle = dev_handle, |
- | |
78 | }; |
- | |
79 | - | ||
80 | return vfs_lookup_internal("/", L_DIRECTORY, result, &altroot); |
- | |
81 | } |
- | |
82 | - | ||
83 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
- | |
84 | { |
84 | { |
- | 85 | /* Resolve the path to the mountpoint. */ |
|
85 | dev_handle_t dev_handle; |
86 | vfs_lookup_res_t mp_res; |
86 | vfs_node_t *mp_node = NULL; |
87 | vfs_node_t *mp_node = NULL; |
87 | int rc; |
88 | int rc; |
88 | int phone; |
89 | int phone; |
89 | - | ||
90 | /* |
- | |
91 | * We expect the library to do the device-name to device-handle |
- | |
92 | * translation for us, thus the device handle will arrive as ARG1 |
- | |
93 | * in the request. |
- | |
94 | */ |
- | |
95 | dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
- | |
96 | - | ||
97 | /* |
- | |
98 | * For now, don't make use of ARG2 and ARG3, but they can be used to |
- | |
99 | * carry mount options in the future. |
- | |
100 | */ |
- | |
101 | - | ||
102 | ipc_callid_t callid; |
- | |
103 | size_t size; |
- | |
104 | - | ||
105 | /* |
- | |
106 | * Now, we expect the client to send us data with the name of the file |
- | |
107 | * system. |
- | |
108 | */ |
- | |
109 | if (!ipc_data_write_receive(&callid, &size)) { |
- | |
110 | ipc_answer_0(callid, EINVAL); |
- | |
111 | ipc_answer_0(rid, EINVAL); |
- | |
112 | return; |
- | |
113 | } |
- | |
114 | - | ||
115 | /* |
- | |
116 | * Don't receive more than is necessary for storing a full file system |
- | |
117 | * name. |
- | |
118 | */ |
- | |
119 | if (size < 1 || size > FS_NAME_MAXLEN) { |
- | |
120 | ipc_answer_0(callid, EINVAL); |
- | |
121 | ipc_answer_0(rid, EINVAL); |
- | |
122 | return; |
- | |
123 | } |
- | |
124 | - | ||
125 | /* Deliver the file system name. */ |
- | |
126 | char fs_name[FS_NAME_MAXLEN + 1]; |
- | |
127 | (void) ipc_data_write_finalize(callid, fs_name, size); |
- | |
128 | fs_name[size] = '\0'; |
- | |
129 | - | ||
130 | /* |
- | |
131 | * Check if we know a file system with the same name as is in fs_name. |
- | |
132 | * This will also give us its file system handle. |
- | |
133 | */ |
- | |
134 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
- | |
135 | if (!fs_handle) { |
- | |
136 | ipc_answer_0(rid, ENOENT); |
- | |
137 | return; |
- | |
138 | } |
- | |
139 | - | ||
140 | /* Now, we want the client to send us the mount point. */ |
- | |
141 | if (!ipc_data_write_receive(&callid, &size)) { |
- | |
142 | ipc_answer_0(callid, EINVAL); |
- | |
143 | ipc_answer_0(rid, EINVAL); |
- | |
144 | return; |
- | |
145 | } |
- | |
146 | - | ||
147 | /* Check whether size is reasonable wrt. the mount point. */ |
- | |
148 | if (size < 1 || size > MAX_PATH_LEN) { |
- | |
149 | ipc_answer_0(callid, EINVAL); |
- | |
150 | ipc_answer_0(rid, EINVAL); |
- | |
151 | return; |
- | |
152 | } |
- | |
153 | /* Allocate buffer for the mount point data being received. */ |
- | |
154 | uint8_t *buf; |
- | |
155 | buf = malloc(size + 1); |
- | |
156 | if (!buf) { |
- | |
157 | ipc_answer_0(callid, ENOMEM); |
- | |
158 | ipc_answer_0(rid, ENOMEM); |
- | |
159 | return; |
- | |
160 | } |
- | |
161 | - | ||
162 | /* Deliver the mount point. */ |
- | |
163 | (void) ipc_data_write_finalize(callid, buf, size); |
- | |
164 | buf[size] = '\0'; |
- | |
165 | - | ||
166 | /* |
- | |
167 | * Lookup the root node of the filesystem being mounted. |
- | |
168 | * In this case, we don't need to take the namespace_futex as the root |
- | |
169 | * node cannot be removed. However, we do take a reference to it so |
- | |
170 | * that we can track how many times it has been mounted. |
- | |
171 | */ |
- | |
172 | vfs_lookup_res_t mr_res; |
- | |
173 | rc = lookup_root(fs_handle, dev_handle, &mr_res); |
- | |
174 | if (rc != EOK) { |
- | |
175 | free(buf); |
- | |
176 | ipc_answer_0(rid, rc); |
- | |
177 | return; |
- | |
178 | } |
- | |
179 | vfs_node_t *mr_node = vfs_node_get(&mr_res); |
- | |
180 | if (!mr_node) { |
- | |
181 | free(buf); |
- | |
182 | ipc_answer_0(rid, ENOMEM); |
- | |
183 | return; |
- | |
184 | } |
- | |
185 | - | ||
186 | /* Finally, we need to resolve the path to the mountpoint. */ |
- | |
187 | vfs_lookup_res_t mp_res; |
- | |
188 | futex_down(&rootfs_futex); |
90 | futex_down(&rootfs_futex); |
189 | if (rootfs.fs_handle) { |
91 | if (rootfs.fs_handle) { |
190 | /* We already have the root FS. */ |
92 | /* We already have the root FS. */ |
191 | rwlock_write_lock(&namespace_rwlock); |
93 | rwlock_write_lock(&namespace_rwlock); |
192 | if ((size == 1) && (buf[0] == '/')) { |
94 | if ((strlen(mp) == 1) && (mp[0] == '/')) { |
193 | /* Trying to mount root FS over root FS */ |
95 | /* Trying to mount root FS over root FS */ |
194 | rwlock_write_unlock(&namespace_rwlock); |
96 | rwlock_write_unlock(&namespace_rwlock); |
195 | futex_up(&rootfs_futex); |
97 | futex_up(&rootfs_futex); |
196 | vfs_node_put(mr_node); |
- | |
197 | free(buf); |
- | |
198 | ipc_answer_0(rid, EBUSY); |
98 | ipc_answer_0(rid, EBUSY); |
199 | return; |
99 | return; |
200 | } |
100 | } |
- | 101 | ||
201 | rc = vfs_lookup_internal(buf, L_DIRECTORY, &mp_res, NULL); |
102 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
202 | if (rc != EOK) { |
103 | if (rc != EOK) { |
203 | /* The lookup failed for some reason. */ |
104 | /* The lookup failed for some reason. */ |
204 | rwlock_write_unlock(&namespace_rwlock); |
105 | rwlock_write_unlock(&namespace_rwlock); |
205 | futex_up(&rootfs_futex); |
106 | futex_up(&rootfs_futex); |
206 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
207 | free(buf); |
- | |
208 | ipc_answer_0(rid, rc); |
107 | ipc_answer_0(rid, rc); |
209 | return; |
108 | return; |
210 | } |
109 | } |
- | 110 | ||
211 | mp_node = vfs_node_get(&mp_res); |
111 | mp_node = vfs_node_get(&mp_res); |
212 | if (!mp_node) { |
112 | if (!mp_node) { |
213 | rwlock_write_unlock(&namespace_rwlock); |
113 | rwlock_write_unlock(&namespace_rwlock); |
214 | futex_up(&rootfs_futex); |
114 | futex_up(&rootfs_futex); |
215 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
216 | free(buf); |
- | |
217 | ipc_answer_0(rid, ENOMEM); |
115 | ipc_answer_0(rid, ENOMEM); |
218 | return; |
116 | return; |
219 | } |
117 | } |
- | 118 | ||
220 | /* |
119 | /* |
221 | * Now we hold a reference to mp_node. |
120 | * Now we hold a reference to mp_node. |
222 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
121 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
223 | * This prevents the mount point from being deleted. |
122 | * This prevents the mount point from being deleted. |
224 | */ |
123 | */ |
225 | rwlock_write_unlock(&namespace_rwlock); |
124 | rwlock_write_unlock(&namespace_rwlock); |
226 | } else { |
125 | } else { |
227 | /* We still don't have the root file system mounted. */ |
126 | /* We still don't have the root file system mounted. */ |
228 | if ((size == 1) && (buf[0] == '/')) { |
127 | if ((strlen(mp) == 1) && (mp[0] == '/')) { |
- | 128 | vfs_lookup_res_t mr_res; |
|
- | 129 | vfs_node_t *mr_node; |
|
- | 130 | ipcarg_t rindex; |
|
- | 131 | ipcarg_t rsize; |
|
- | 132 | ipcarg_t rlnkcnt; |
|
- | 133 | ||
229 | /* |
134 | /* |
230 | * For this simple, but important case, |
135 | * For this simple, but important case, |
231 | * we are almost done. |
136 | * we are almost done. |
232 | */ |
137 | */ |
233 | free(buf); |
- | |
234 | 138 | ||
235 | /* Inform the mount point about the root mount. */ |
139 | /* Tell the mountee that it is being mounted. */ |
236 | phone = vfs_grab_phone(mr_res.triplet.fs_handle); |
140 | phone = vfs_grab_phone(fs_handle); |
237 | rc = async_req_5_0(phone, VFS_MOUNT, |
141 | rc = async_req_1_3(phone, VFS_MOUNTED, |
238 | (ipcarg_t) mr_res.triplet.dev_handle, |
- | |
239 | (ipcarg_t) mr_res.triplet.index, |
- | |
240 | (ipcarg_t) mr_res.triplet.fs_handle, |
- | |
241 | (ipcarg_t) mr_res.triplet.dev_handle, |
- | |
242 | (ipcarg_t) mr_res.triplet.index); |
142 | (ipcarg_t) dev_handle, &rindex, &rsize, &rlnkcnt); |
243 | vfs_release_phone(phone); |
143 | vfs_release_phone(phone); |
244 | 144 | ||
245 | if (rc == EOK) |
145 | if (rc != EOK) { |
- | 146 | futex_up(&rootfs_futex); |
|
246 | rootfs = mr_res.triplet; |
147 | ipc_answer_0(rid, rc); |
247 | else |
148 | return; |
- | 149 | } |
|
- | 150 | ||
- | 151 | mr_res.triplet.fs_handle = fs_handle; |
|
- | 152 | mr_res.triplet.dev_handle = dev_handle; |
|
- | 153 | mr_res.triplet.index = (fs_index_t) rindex; |
|
248 | vfs_node_put(mr_node); |
154 | mr_res.size = (size_t) rsize; |
- | 155 | mr_res.lnkcnt = (unsigned) rlnkcnt; |
|
- | 156 | mr_res.type = VFS_NODE_DIRECTORY; |
|
249 | 157 | ||
- | 158 | rootfs.fs_handle = fs_handle; |
|
- | 159 | rootfs.dev_handle = dev_handle; |
|
250 | futex_up(&rootfs_futex); |
160 | futex_up(&rootfs_futex); |
- | 161 | ||
- | 162 | /* Add reference to the mounted root. */ |
|
- | 163 | mr_node = vfs_node_get(&mr_res); |
|
- | 164 | assert(mr_node); |
|
- | 165 | ||
251 | ipc_answer_0(rid, rc); |
166 | ipc_answer_0(rid, rc); |
252 | return; |
167 | return; |
253 | } else { |
168 | } else { |
254 | /* |
169 | /* |
255 | * We can't resolve this without the root filesystem |
170 | * We can't resolve this without the root filesystem |
256 | * being mounted first. |
171 | * being mounted first. |
257 | */ |
172 | */ |
258 | futex_up(&rootfs_futex); |
173 | futex_up(&rootfs_futex); |
259 | free(buf); |
- | |
260 | vfs_node_put(mr_node); /* failed -> drop reference */ |
- | |
261 | ipc_answer_0(rid, ENOENT); |
174 | ipc_answer_0(rid, ENOENT); |
262 | return; |
175 | return; |
263 | } |
176 | } |
264 | } |
177 | } |
265 | futex_up(&rootfs_futex); |
178 | futex_up(&rootfs_futex); |
266 | 179 | ||
267 | free(buf); /* The buffer is not needed anymore. */ |
- | |
268 | - | ||
269 | /* |
180 | /* |
270 | * At this point, we have all necessary pieces: file system and device |
181 | * At this point, we have all necessary pieces: file system and device |
271 | * handles, and we know the mount point VFS node and also the root node |
182 | * handles, and we know the mount point VFS node. |
272 | * of the file system being mounted. |
- | |
273 | */ |
- | |
274 | - | ||
275 | /** |
- | |
276 | * @todo |
- | |
277 | * Add more IPC parameters so that we can send mount mode/flags. |
- | |
278 | */ |
183 | */ |
- | 184 | ||
279 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
185 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
280 | rc = async_req_5_0(phone, VFS_MOUNT, |
186 | rc = async_req_4_0(phone, VFS_MOUNT, |
281 | (ipcarg_t) mp_res.triplet.dev_handle, |
187 | (ipcarg_t) mp_res.triplet.dev_handle, |
282 | (ipcarg_t) mp_res.triplet.index, |
188 | (ipcarg_t) mp_res.triplet.index, |
283 | (ipcarg_t) mr_res.triplet.fs_handle, |
189 | (ipcarg_t) fs_handle, |
284 | (ipcarg_t) mr_res.triplet.dev_handle, |
190 | (ipcarg_t) dev_handle); |
285 | (ipcarg_t) mr_res.triplet.index); |
- | |
286 | vfs_release_phone(phone); |
191 | vfs_release_phone(phone); |
287 | 192 | ||
288 | if (rc != EOK) { |
193 | if (rc != EOK) { |
289 | /* Mount failed, drop references to mr_node and mp_node. */ |
194 | /* Mount failed, drop reference to mp_node. */ |
290 | vfs_node_put(mr_node); |
- | |
291 | if (mp_node) |
195 | if (mp_node) |
292 | vfs_node_put(mp_node); |
196 | vfs_node_put(mp_node); |
293 | } |
197 | } |
294 | 198 | ||
295 | ipc_answer_0(rid, rc); |
199 | ipc_answer_0(rid, rc); |
296 | } |
200 | } |
297 | 201 | ||
- | 202 | /** Process pending mount requests */ |
|
- | 203 | void vfs_process_pending_mount() |
|
- | 204 | { |
|
- | 205 | link_t *cur; |
|
- | 206 | ||
- | 207 | loop: |
|
- | 208 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
|
- | 209 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
|
- | 210 | ||
- | 211 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, true); |
|
- | 212 | if (!fs_handle) |
|
- | 213 | continue; |
|
- | 214 | ||
- | 215 | /* Acknowledge that we know fs_name. */ |
|
- | 216 | ipc_answer_0(pr->callid, EOK); |
|
- | 217 | ||
- | 218 | /* Do the mount */ |
|
- | 219 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp); |
|
- | 220 | ||
- | 221 | free(pr->fs_name); |
|
- | 222 | free(pr->mp); |
|
- | 223 | list_remove(cur); |
|
- | 224 | free(pr); |
|
- | 225 | goto loop; |
|
- | 226 | } |
|
- | 227 | } |
|
- | 228 | ||
- | 229 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
|
- | 230 | { |
|
- | 231 | /* |
|
- | 232 | * We expect the library to do the device-name to device-handle |
|
- | 233 | * translation for us, thus the device handle will arrive as ARG1 |
|
- | 234 | * in the request. |
|
- | 235 | */ |
|
- | 236 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
|
- | 237 | ||
- | 238 | /* |
|
- | 239 | * Mount flags are passed as ARG2. |
|
- | 240 | */ |
|
- | 241 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
|
- | 242 | ||
- | 243 | /* |
|
- | 244 | * For now, don't make use of ARG3, but it can be used to |
|
- | 245 | * carry mount options in the future. |
|
- | 246 | */ |
|
- | 247 | ||
- | 248 | /* We want the client to send us the mount point. */ |
|
- | 249 | ipc_callid_t callid; |
|
- | 250 | size_t size; |
|
- | 251 | if (!ipc_data_write_receive(&callid, &size)) { |
|
- | 252 | ipc_answer_0(callid, EINVAL); |
|
- | 253 | ipc_answer_0(rid, EINVAL); |
|
- | 254 | return; |
|
- | 255 | } |
|
- | 256 | ||
- | 257 | /* Check whether size is reasonable wrt. the mount point. */ |
|
- | 258 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
|
- | 259 | ipc_answer_0(callid, EINVAL); |
|
- | 260 | ipc_answer_0(rid, EINVAL); |
|
- | 261 | return; |
|
- | 262 | } |
|
- | 263 | ||
- | 264 | /* Allocate buffer for the mount point data being received. */ |
|
- | 265 | char *mp = malloc(size + 1); |
|
- | 266 | if (!mp) { |
|
- | 267 | ipc_answer_0(callid, ENOMEM); |
|
- | 268 | ipc_answer_0(rid, ENOMEM); |
|
- | 269 | return; |
|
- | 270 | } |
|
- | 271 | ||
- | 272 | /* Deliver the mount point. */ |
|
- | 273 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
|
- | 274 | if (retval != EOK) { |
|
- | 275 | ipc_answer_0(rid, EREFUSED); |
|
- | 276 | free(mp); |
|
- | 277 | return; |
|
- | 278 | } |
|
- | 279 | mp[size] = '\0'; |
|
- | 280 | ||
- | 281 | /* |
|
- | 282 | * Now, we expect the client to send us data with the name of the file |
|
- | 283 | * system. |
|
- | 284 | */ |
|
- | 285 | if (!ipc_data_write_receive(&callid, &size)) { |
|
- | 286 | ipc_answer_0(callid, EINVAL); |
|
- | 287 | ipc_answer_0(rid, EINVAL); |
|
- | 288 | free(mp); |
|
- | 289 | return; |
|
- | 290 | } |
|
- | 291 | ||
- | 292 | /* |
|
- | 293 | * Don't receive more than is necessary for storing a full file system |
|
- | 294 | * name. |
|
- | 295 | */ |
|
- | 296 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
|
- | 297 | ipc_answer_0(callid, EINVAL); |
|
- | 298 | ipc_answer_0(rid, EINVAL); |
|
- | 299 | free(mp); |
|
- | 300 | return; |
|
- | 301 | } |
|
- | 302 | ||
- | 303 | /* |
|
- | 304 | * Allocate buffer for file system name. |
|
- | 305 | */ |
|
- | 306 | char *fs_name = (char *) malloc(size + 1); |
|
- | 307 | if (fs_name == NULL) { |
|
- | 308 | ipc_answer_0(callid, ENOMEM); |
|
- | 309 | ipc_answer_0(rid, EREFUSED); |
|
- | 310 | free(mp); |
|
- | 311 | return; |
|
- | 312 | } |
|
- | 313 | ||
- | 314 | /* Deliver the file system name. */ |
|
- | 315 | retval = ipc_data_write_finalize(callid, fs_name, size); |
|
- | 316 | if (retval != EOK) { |
|
- | 317 | ipc_answer_0(rid, EREFUSED); |
|
- | 318 | free(mp); |
|
- | 319 | free(fs_name); |
|
- | 320 | return; |
|
- | 321 | } |
|
- | 322 | fs_name[size] = '\0'; |
|
- | 323 | ||
- | 324 | /* |
|
- | 325 | * Check if we know a file system with the same name as is in fs_name. |
|
- | 326 | * This will also give us its file system handle. |
|
- | 327 | */ |
|
- | 328 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
|
- | 329 | if (!fs_handle) { |
|
- | 330 | if (flags & IPC_FLAG_BLOCKING) { |
|
- | 331 | /* Blocking mount, add to pending list */ |
|
- | 332 | pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
|
- | 333 | if (!pr) { |
|
- | 334 | ipc_answer_0(callid, ENOMEM); |
|
- | 335 | ipc_answer_0(rid, ENOMEM); |
|
- | 336 | free(mp); |
|
- | 337 | free(fs_name); |
|
- | 338 | return; |
|
- | 339 | } |
|
- | 340 | ||
- | 341 | pr->fs_name = fs_name; |
|
- | 342 | pr->mp = mp; |
|
- | 343 | pr->callid = callid; |
|
- | 344 | pr->rid = rid; |
|
- | 345 | pr->dev_handle = dev_handle; |
|
- | 346 | list_append(&pr->link, &pending_req); |
|
- | 347 | return; |
|
- | 348 | } |
|
- | 349 | ||
- | 350 | ipc_answer_0(callid, ENOENT); |
|
- | 351 | ipc_answer_0(rid, ENOENT); |
|
- | 352 | free(mp); |
|
- | 353 | free(fs_name); |
|
- | 354 | return; |
|
- | 355 | } |
|
- | 356 | ||
- | 357 | /* Acknowledge that we know fs_name. */ |
|
- | 358 | ipc_answer_0(callid, EOK); |
|
- | 359 | ||
- | 360 | /* Do the mount */ |
|
- | 361 | vfs_mount_internal(rid, dev_handle, fs_handle, mp); |
|
- | 362 | free(mp); |
|
- | 363 | free(fs_name); |
|
- | 364 | } |
|
- | 365 | ||
298 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
366 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
299 | { |
367 | { |
300 | if (!vfs_files_init()) { |
368 | if (!vfs_files_init()) { |
301 | ipc_answer_0(rid, ENOMEM); |
369 | ipc_answer_0(rid, ENOMEM); |
302 | return; |
370 | return; |
Line 313... | Line 381... | ||
313 | int lflag = IPC_GET_ARG1(*request); |
381 | int lflag = IPC_GET_ARG1(*request); |
314 | int oflag = IPC_GET_ARG2(*request); |
382 | int oflag = IPC_GET_ARG2(*request); |
315 | int mode = IPC_GET_ARG3(*request); |
383 | int mode = IPC_GET_ARG3(*request); |
316 | size_t len; |
384 | size_t len; |
317 | 385 | ||
- | 386 | /* |
|
- | 387 | * Make sure that we are called with exactly one of L_FILE and |
|
- | 388 | * L_DIRECTORY. |
|
- | 389 | */ |
|
- | 390 | if ((lflag & (L_FILE | L_DIRECTORY)) == 0 || |
|
- | 391 | (lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) { |
|
- | 392 | ipc_answer_0(rid, EINVAL); |
|
- | 393 | return; |
|
- | 394 | } |
|
- | 395 | ||
318 | if (oflag & O_CREAT) |
396 | if (oflag & O_CREAT) |
319 | lflag |= L_CREATE; |
397 | lflag |= L_CREATE; |
320 | if (oflag & O_EXCL) |
398 | if (oflag & O_EXCL) |
321 | lflag |= L_EXCLUSIVE; |
399 | lflag |= L_EXCLUSIVE; |
322 | 400 | ||
Line 420... | Line 498... | ||
420 | } |
498 | } |
421 | 499 | ||
422 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
500 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
423 | { |
501 | { |
424 | int fd = IPC_GET_ARG1(*request); |
502 | int fd = IPC_GET_ARG1(*request); |
425 | if (fd >= MAX_OPEN_FILES) { |
- | |
426 | ipc_answer_0(rid, EBADF); |
- | |
427 | return; |
- | |
428 | } |
- | |
429 | vfs_fd_free(fd); |
503 | int rc = vfs_fd_free(fd); |
430 | ipc_answer_0(rid, EOK); |
504 | ipc_answer_0(rid, rc); |
431 | } |
505 | } |
432 | 506 | ||
433 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
507 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
434 | { |
508 | { |
435 | 509 | ||
Line 442... | Line 516... | ||
442 | * Additional synchronization needs to be added once the table of |
516 | * Additional synchronization needs to be added once the table of |
443 | * open files supports parallel access! |
517 | * open files supports parallel access! |
444 | */ |
518 | */ |
445 | 519 | ||
446 | int fd = IPC_GET_ARG1(*request); |
520 | int fd = IPC_GET_ARG1(*request); |
447 | 521 | ||
448 | /* Lookup the file structure corresponding to the file descriptor. */ |
522 | /* Lookup the file structure corresponding to the file descriptor. */ |
449 | vfs_file_t *file = vfs_file_get(fd); |
523 | vfs_file_t *file = vfs_file_get(fd); |
450 | if (!file) { |
524 | if (!file) { |
451 | ipc_answer_0(rid, ENOENT); |
525 | ipc_answer_0(rid, ENOENT); |
452 | return; |
526 | return; |
453 | } |
527 | } |
454 | 528 | ||
455 | /* |
529 | /* |
456 | * Now we need to receive a call with client's |
530 | * Now we need to receive a call with client's |
457 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
531 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
458 | */ |
532 | */ |
459 | ipc_callid_t callid; |
533 | ipc_callid_t callid; |
Line 465... | Line 539... | ||
465 | if (!res) { |
539 | if (!res) { |
466 | ipc_answer_0(callid, EINVAL); |
540 | ipc_answer_0(callid, EINVAL); |
467 | ipc_answer_0(rid, EINVAL); |
541 | ipc_answer_0(rid, EINVAL); |
468 | return; |
542 | return; |
469 | } |
543 | } |
470 | 544 | ||
471 | /* |
545 | /* |
472 | * Lock the open file structure so that no other thread can manipulate |
546 | * Lock the open file structure so that no other thread can manipulate |
473 | * the same open file at a time. |
547 | * the same open file at a time. |
474 | */ |
548 | */ |
475 | futex_down(&file->lock); |
549 | futex_down(&file->lock); |
Line 481... | Line 555... | ||
481 | if (read) |
555 | if (read) |
482 | rwlock_read_lock(&file->node->contents_rwlock); |
556 | rwlock_read_lock(&file->node->contents_rwlock); |
483 | else |
557 | else |
484 | rwlock_write_lock(&file->node->contents_rwlock); |
558 | rwlock_write_lock(&file->node->contents_rwlock); |
485 | 559 | ||
- | 560 | if (file->node->type == VFS_NODE_DIRECTORY) { |
|
- | 561 | /* |
|
- | 562 | * Make sure that no one is modifying the namespace |
|
- | 563 | * while we are in readdir(). |
|
- | 564 | */ |
|
- | 565 | assert(read); |
|
- | 566 | rwlock_read_lock(&namespace_rwlock); |
|
- | 567 | } |
|
- | 568 | ||
486 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
569 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
487 | 570 | ||
488 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
571 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
489 | aid_t msg; |
572 | aid_t msg; |
490 | ipc_call_t answer; |
573 | ipc_call_t answer; |
Line 498... | Line 581... | ||
498 | * destination FS server. The call will be routed as if sent by |
581 | * destination FS server. The call will be routed as if sent by |
499 | * ourselves. Note that call arguments are immutable in this case so we |
582 | * ourselves. Note that call arguments are immutable in this case so we |
500 | * don't have to bother. |
583 | * don't have to bother. |
501 | */ |
584 | */ |
502 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
585 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
503 | 586 | ||
504 | vfs_release_phone(fs_phone); |
587 | vfs_release_phone(fs_phone); |
505 | 588 | ||
506 | /* Wait for reply from the FS server. */ |
589 | /* Wait for reply from the FS server. */ |
507 | ipcarg_t rc; |
590 | ipcarg_t rc; |
508 | async_wait_for(msg, &rc); |
591 | async_wait_for(msg, &rc); |
509 | size_t bytes = IPC_GET_ARG1(answer); |
592 | size_t bytes = IPC_GET_ARG1(answer); |
510 | 593 | ||
- | 594 | if (file->node->type == VFS_NODE_DIRECTORY) |
|
- | 595 | rwlock_read_unlock(&namespace_rwlock); |
|
- | 596 | ||
511 | /* Unlock the VFS node. */ |
597 | /* Unlock the VFS node. */ |
512 | if (read) |
598 | if (read) |
513 | rwlock_read_unlock(&file->node->contents_rwlock); |
599 | rwlock_read_unlock(&file->node->contents_rwlock); |
514 | else { |
600 | else { |
515 | /* Update the cached version of node's size. */ |
601 | /* Update the cached version of node's size. */ |
516 | if (rc == EOK) |
602 | if (rc == EOK) |
517 | file->node->size = IPC_GET_ARG2(answer); |
603 | file->node->size = IPC_GET_ARG2(answer); |
518 | rwlock_write_unlock(&file->node->contents_rwlock); |
604 | rwlock_write_unlock(&file->node->contents_rwlock); |
519 | } |
605 | } |
520 | 606 | ||
521 | /* Update the position pointer and unlock the open file. */ |
607 | /* Update the position pointer and unlock the open file. */ |
522 | if (rc == EOK) |
608 | if (rc == EOK) |
523 | file->pos += bytes; |
609 | file->pos += bytes; |
524 | futex_up(&file->lock); |
610 | futex_up(&file->lock); |
525 | 611 | ||
526 | /* |
612 | /* |
527 | * FS server's reply is the final result of the whole operation we |
613 | * FS server's reply is the final result of the whole operation we |
528 | * return to the client. |
614 | * return to the client. |
529 | */ |
615 | */ |
530 | ipc_answer_1(rid, rc, bytes); |
616 | ipc_answer_1(rid, rc, bytes); |