Changes in uspace/srv/vfs/vfs_ops.c [b4cbef1:2b88074b] in mainline
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uspace/srv/vfs/vfs_ops.c
rb4cbef1 r2b88074b 44 44 #include <string.h> 45 45 #include <bool.h> 46 #include <fibril_sync h.h>46 #include <fibril_sync.h> 47 47 #include <adt/list.h> 48 48 #include <unistd.h> … … 92 92 } 93 93 94 rc = vfs_lookup_internal(mp, L_ MP, &mp_res, NULL);94 rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); 95 95 if (rc != EOK) { 96 96 /* The lookup failed for some reason. */ … … 266 266 267 267 /* We want the client to send us the mount point. */ 268 char *mp; 269 int rc = async_string_receive(&mp, MAX_PATH_LEN, NULL); 270 if (rc != EOK) { 271 ipc_answer_0(rid, rc); 272 return; 273 } 268 ipc_callid_t callid; 269 size_t size; 270 if (!async_data_write_receive(&callid, &size)) { 271 ipc_answer_0(callid, EINVAL); 272 ipc_answer_0(rid, EINVAL); 273 return; 274 } 275 276 /* Check whether size is reasonable wrt. the mount point. */ 277 if ((size < 1) || (size > MAX_PATH_LEN)) { 278 ipc_answer_0(callid, EINVAL); 279 ipc_answer_0(rid, EINVAL); 280 return; 281 } 282 283 /* Allocate buffer for the mount point data being received. */ 284 char *mp = malloc(size + 1); 285 if (!mp) { 286 ipc_answer_0(callid, ENOMEM); 287 ipc_answer_0(rid, ENOMEM); 288 return; 289 } 290 291 /* Deliver the mount point. */ 292 ipcarg_t retval = async_data_write_finalize(callid, mp, size); 293 if (retval != EOK) { 294 ipc_answer_0(rid, retval); 295 free(mp); 296 return; 297 } 298 mp[size] = '\0'; 274 299 275 300 /* Now we expect to receive the mount options. */ 276 char *opts;277 rc = async_string_receive(&opts, MAX_MNTOPTS_LEN, NULL);278 if (rc != EOK) {301 if (!async_data_write_receive(&callid, &size)) { 302 ipc_answer_0(callid, EINVAL); 303 ipc_answer_0(rid, EINVAL); 279 304 free(mp); 280 ipc_answer_0(rid, rc); 281 return; 282 } 305 return; 306 } 307 308 /* Check the offered options size. */ 309 if (size > MAX_MNTOPTS_LEN) { 310 ipc_answer_0(callid, EINVAL); 311 ipc_answer_0(rid, EINVAL); 312 free(mp); 313 return; 314 } 315 316 /* Allocate buffer for the mount options. */ 317 char *opts = (char *) malloc(size + 1); 318 if (!opts) { 319 ipc_answer_0(callid, ENOMEM); 320 ipc_answer_0(rid, ENOMEM); 321 free(mp); 322 return; 323 } 324 325 /* Deliver the mount options. */ 326 retval = async_data_write_finalize(callid, opts, size); 327 if (retval != EOK) { 328 ipc_answer_0(rid, retval); 329 free(mp); 330 free(opts); 331 return; 332 } 333 opts[size] = '\0'; 283 334 284 335 /* … … 286 337 * system. 287 338 */ 288 char *fs_name;289 rc = async_string_receive(&fs_name, FS_NAME_MAXLEN, NULL);290 if (rc != EOK) {339 if (!async_data_write_receive(&callid, &size)) { 340 ipc_answer_0(callid, EINVAL); 341 ipc_answer_0(rid, EINVAL); 291 342 free(mp); 292 343 free(opts); 293 ipc_answer_0(rid, rc); 294 return; 295 } 296 344 return; 345 } 346 347 /* 348 * Don't receive more than is necessary for storing a full file system 349 * name. 350 */ 351 if ((size < 1) || (size > FS_NAME_MAXLEN)) { 352 ipc_answer_0(callid, EINVAL); 353 ipc_answer_0(rid, EINVAL); 354 free(mp); 355 free(opts); 356 return; 357 } 358 359 /* 360 * Allocate buffer for file system name. 361 */ 362 char *fs_name = (char *) malloc(size + 1); 363 if (fs_name == NULL) { 364 ipc_answer_0(callid, ENOMEM); 365 ipc_answer_0(rid, ENOMEM); 366 free(mp); 367 free(opts); 368 return; 369 } 370 371 /* Deliver the file system name. */ 372 retval = async_data_write_finalize(callid, fs_name, size); 373 if (retval != EOK) { 374 ipc_answer_0(rid, retval); 375 free(mp); 376 free(opts); 377 free(fs_name); 378 return; 379 } 380 fs_name[size] = '\0'; 381 297 382 /* 298 383 * Wait for IPC_M_PING so that we can return an error if we don't know … … 300 385 */ 301 386 ipc_call_t data; 302 ipc_callid_tcallid = async_get_call(&data);387 callid = async_get_call(&data); 303 388 if (IPC_GET_METHOD(data) != IPC_M_PING) { 304 389 ipc_answer_0(callid, ENOTSUP); … … 344 429 } 345 430 346 void vfs_unmount(ipc_callid_t rid, ipc_call_t *request)347 {348 int rc;349 char *mp;350 vfs_lookup_res_t mp_res;351 vfs_lookup_res_t mr_res;352 vfs_node_t *mp_node;353 vfs_node_t *mr_node;354 int phone;355 356 /*357 * Receive the mount point path.358 */359 rc = async_string_receive(&mp, MAX_PATH_LEN, NULL);360 if (rc != EOK)361 ipc_answer_0(rid, rc);362 363 /*364 * Taking the namespace lock will do two things for us. First, it will365 * prevent races with other lookup operations. Second, it will stop new366 * references to already existing VFS nodes and creation of new VFS367 * nodes. This is because new references are added as a result of some368 * lookup operation or at least of some operation which is protected by369 * the namespace lock.370 */371 fibril_rwlock_write_lock(&namespace_rwlock);372 373 /*374 * Lookup the mounted root and instantiate it.375 */376 rc = vfs_lookup_internal(mp, L_ROOT, &mr_res, NULL);377 if (rc != EOK) {378 fibril_rwlock_write_unlock(&namespace_rwlock);379 free(mp);380 ipc_answer_0(rid, rc);381 return;382 }383 mr_node = vfs_node_get(&mr_res);384 if (!mr_node) {385 fibril_rwlock_write_unlock(&namespace_rwlock);386 free(mp);387 ipc_answer_0(rid, ENOMEM);388 return;389 }390 391 /*392 * Count the total number of references for the mounted file system. We393 * are expecting at least two. One which we got above and one which we394 * got when the file system was mounted. If we find more, it means that395 * the file system cannot be gracefully unmounted at the moment because396 * someone is working with it.397 */398 if (vfs_nodes_refcount_sum_get(mr_node->fs_handle,399 mr_node->dev_handle) != 2) {400 fibril_rwlock_write_unlock(&namespace_rwlock);401 vfs_node_put(mr_node);402 free(mp);403 ipc_answer_0(rid, EBUSY);404 return;405 }406 407 if (str_cmp(mp, "/") == 0) {408 409 /*410 * Unmounting the root file system.411 *412 * In this case, there is no mount point node and we send413 * VFS_OUT_UNMOUNTED directly to the mounted file system.414 */415 416 free(mp);417 phone = vfs_grab_phone(mr_node->fs_handle);418 rc = async_req_1_0(phone, VFS_OUT_UNMOUNTED,419 mr_node->dev_handle);420 vfs_release_phone(phone);421 if (rc != EOK) {422 fibril_rwlock_write_unlock(&namespace_rwlock);423 vfs_node_put(mr_node);424 ipc_answer_0(rid, rc);425 return;426 }427 rootfs.fs_handle = 0;428 rootfs.dev_handle = 0;429 } else {430 431 /*432 * Unmounting a non-root file system.433 *434 * We have a regular mount point node representing the parent435 * file system, so we delegate the operation to it.436 */437 438 rc = vfs_lookup_internal(mp, L_MP, &mp_res, NULL);439 free(mp);440 if (rc != EOK) {441 fibril_rwlock_write_unlock(&namespace_rwlock);442 vfs_node_put(mr_node);443 ipc_answer_0(rid, rc);444 return;445 }446 vfs_node_t *mp_node = vfs_node_get(&mp_res);447 if (!mp_node) {448 fibril_rwlock_write_unlock(&namespace_rwlock);449 vfs_node_put(mr_node);450 ipc_answer_0(rid, ENOMEM);451 return;452 }453 454 phone = vfs_grab_phone(mp_node->fs_handle);455 rc = async_req_2_0(phone, VFS_OUT_UNMOUNT, mp_node->dev_handle,456 mp_node->index);457 vfs_release_phone(phone);458 if (rc != EOK) {459 fibril_rwlock_write_unlock(&namespace_rwlock);460 vfs_node_put(mp_node);461 vfs_node_put(mr_node);462 ipc_answer_0(rid, rc);463 return;464 }465 466 /* Drop the reference we got above. */467 vfs_node_put(mp_node);468 /* Drop the reference from when the file system was mounted. */469 vfs_node_put(mp_node);470 }471 472 473 /*474 * All went well, the mounted file system was successfully unmounted.475 * The only thing left is to forget the unmounted root VFS node.476 */477 vfs_node_forget(mr_node);478 479 fibril_rwlock_write_unlock(&namespace_rwlock);480 ipc_answer_0(rid, EOK);481 }482 483 431 void vfs_open(ipc_callid_t rid, ipc_call_t *request) 484 432 { … … 506 454 /* 507 455 * Make sure that we are called with exactly one of L_FILE and 508 * L_DIRECTORY. Make sure that the user does not pass L_OPEN, 509 * L_ROOT or L_MP. 456 * L_DIRECTORY. Make sure that the user does not pass L_OPEN. 510 457 */ 511 458 if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || 512 459 ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || 513 ( lflag & (L_OPEN | L_ROOT | L_MP))) {460 ((lflag & L_OPEN) != 0)) { 514 461 ipc_answer_0(rid, EINVAL); 515 462 return; … … 521 468 lflag |= L_EXCLUSIVE; 522 469 523 char *path; 524 int rc = async_string_receive(&path, 0, NULL); 525 if (rc != EOK) { 526 ipc_answer_0(rid, rc); 527 return; 528 } 470 ipc_callid_t callid; 471 if (!async_data_write_receive(&callid, &len)) { 472 ipc_answer_0(callid, EINVAL); 473 ipc_answer_0(rid, EINVAL); 474 return; 475 } 476 477 char *path = malloc(len + 1); 478 if (!path) { 479 ipc_answer_0(callid, ENOMEM); 480 ipc_answer_0(rid, ENOMEM); 481 return; 482 } 483 484 int rc; 485 if ((rc = async_data_write_finalize(callid, path, len))) { 486 ipc_answer_0(rid, rc); 487 free(path); 488 return; 489 } 490 path[len] = '\0'; 529 491 530 492 /* … … 717 679 } 718 680 719 int vfs_close_internal(vfs_file_t *file)681 static int vfs_close_internal(vfs_file_t *file) 720 682 { 721 683 /* … … 794 756 795 757 /* 758 * Now we need to receive a call with client's 759 * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. 760 */ 761 ipc_callid_t callid; 762 int res; 763 if (read) 764 res = async_data_read_receive(&callid, NULL); 765 else 766 res = async_data_write_receive(&callid, NULL); 767 if (!res) { 768 ipc_answer_0(callid, EINVAL); 769 ipc_answer_0(rid, EINVAL); 770 return; 771 } 772 773 /* 796 774 * Lock the open file structure so that no other thread can manipulate 797 775 * the same open file at a time. … … 817 795 } 818 796 819 int fs_phone = vfs_grab_phone(file->node->fs_handle); 820 821 /* 822 * Make a VFS_READ/VFS_WRITE request at the destination FS server 823 * and forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the 797 int fs_phone = vfs_grab_phone(file->node->fs_handle); 798 799 /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ 800 aid_t msg; 801 ipc_call_t answer; 802 if (!read && file->append) 803 file->pos = file->node->size; 804 msg = async_send_3(fs_phone, read ? VFS_OUT_READ : VFS_OUT_WRITE, 805 file->node->dev_handle, file->node->index, file->pos, &answer); 806 807 /* 808 * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the 824 809 * destination FS server. The call will be routed as if sent by 825 810 * ourselves. Note that call arguments are immutable in this case so we 826 811 * don't have to bother. 827 812 */ 813 ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); 814 815 /* Wait for reply from the FS server. */ 828 816 ipcarg_t rc; 829 ipc_call_t answer; 830 if (read) { 831 if (file->append) 832 file->pos = file->node->size; 833 834 rc = async_data_read_forward_3_1(fs_phone, VFS_OUT_READ, 835 file->node->dev_handle, file->node->index, file->pos, 836 &answer); 837 } else { 838 rc = async_data_forward_3_1(fs_phone, VFS_OUT_WRITE, 839 file->node->dev_handle, file->node->index, file->pos, 840 &answer); 841 } 817 async_wait_for(msg, &rc); 842 818 843 819 vfs_release_phone(fs_phone); 844 820 845 821 size_t bytes = IPC_GET_ARG1(answer); 846 822 847 823 if (file->node->type == VFS_NODE_DIRECTORY) 848 824 fibril_rwlock_read_unlock(&namespace_rwlock); … … 924 900 } 925 901 newpos = size + off; 926 file->pos = newpos;927 902 fibril_mutex_unlock(&file->lock); 928 903 ipc_answer_1(rid, EOK, newpos); … … 1006 981 void vfs_stat(ipc_callid_t rid, ipc_call_t *request) 1007 982 { 1008 char *path; 1009 int rc = async_string_receive(&path, 0, NULL); 1010 if (rc != EOK) { 1011 ipc_answer_0(rid, rc); 1012 return; 1013 } 1014 983 size_t len; 1015 984 ipc_callid_t callid; 985 986 if (!async_data_write_receive(&callid, &len)) { 987 ipc_answer_0(callid, EINVAL); 988 ipc_answer_0(rid, EINVAL); 989 return; 990 } 991 char *path = malloc(len + 1); 992 if (!path) { 993 ipc_answer_0(callid, ENOMEM); 994 ipc_answer_0(rid, ENOMEM); 995 return; 996 } 997 int rc; 998 if ((rc = async_data_write_finalize(callid, path, len))) { 999 ipc_answer_0(rid, rc); 1000 free(path); 1001 return; 1002 } 1003 path[len] = '\0'; 1004 1016 1005 if (!async_data_read_receive(&callid, NULL)) { 1017 1006 free(path); … … 1059 1048 { 1060 1049 int mode = IPC_GET_ARG1(*request); 1061 1062 char *path; 1063 int rc = async_string_receive(&path, 0, NULL); 1064 if (rc != EOK) { 1065 ipc_answer_0(rid, rc); 1066 return; 1067 } 1068 1050 1051 size_t len; 1052 ipc_callid_t callid; 1053 1054 if (!async_data_write_receive(&callid, &len)) { 1055 ipc_answer_0(callid, EINVAL); 1056 ipc_answer_0(rid, EINVAL); 1057 return; 1058 } 1059 char *path = malloc(len + 1); 1060 if (!path) { 1061 ipc_answer_0(callid, ENOMEM); 1062 ipc_answer_0(rid, ENOMEM); 1063 return; 1064 } 1065 int rc; 1066 if ((rc = async_data_write_finalize(callid, path, len))) { 1067 ipc_answer_0(rid, rc); 1068 free(path); 1069 return; 1070 } 1071 path[len] = '\0'; 1072 1069 1073 /* Ignore mode for now. */ 1070 1074 (void) mode; … … 1081 1085 { 1082 1086 int lflag = IPC_GET_ARG1(*request); 1083 1084 char *path; 1085 int rc = async_string_receive(&path, 0, NULL); 1086 if (rc != EOK) { 1087 ipc_answer_0(rid, rc); 1088 return; 1089 } 1087 1088 size_t len; 1089 ipc_callid_t callid; 1090 1091 if (!async_data_write_receive(&callid, &len)) { 1092 ipc_answer_0(callid, EINVAL); 1093 ipc_answer_0(rid, EINVAL); 1094 return; 1095 } 1096 char *path = malloc(len + 1); 1097 if (!path) { 1098 ipc_answer_0(callid, ENOMEM); 1099 ipc_answer_0(rid, ENOMEM); 1100 return; 1101 } 1102 int rc; 1103 if ((rc = async_data_write_finalize(callid, path, len))) { 1104 ipc_answer_0(rid, rc); 1105 free(path); 1106 return; 1107 } 1108 path[len] = '\0'; 1090 1109 1091 1110 fibril_rwlock_write_lock(&namespace_rwlock); … … 1116 1135 void vfs_rename(ipc_callid_t rid, ipc_call_t *request) 1117 1136 { 1137 size_t olen, nlen; 1138 ipc_callid_t callid; 1139 int rc; 1140 1118 1141 /* Retrieve the old path. */ 1119 char *old; 1120 int rc = async_string_receive(&old, 0, NULL); 1121 if (rc != EOK) { 1122 ipc_answer_0(rid, rc); 1123 return; 1124 } 1142 if (!async_data_write_receive(&callid, &olen)) { 1143 ipc_answer_0(callid, EINVAL); 1144 ipc_answer_0(rid, EINVAL); 1145 return; 1146 } 1147 char *old = malloc(olen + 1); 1148 if (!old) { 1149 ipc_answer_0(callid, ENOMEM); 1150 ipc_answer_0(rid, ENOMEM); 1151 return; 1152 } 1153 if ((rc = async_data_write_finalize(callid, old, olen))) { 1154 ipc_answer_0(rid, rc); 1155 free(old); 1156 return; 1157 } 1158 old[olen] = '\0'; 1125 1159 1126 1160 /* Retrieve the new path. */ 1127 char *new;1128 rc = async_string_receive(&new, 0, NULL);1129 if (rc != EOK) {1161 if (!async_data_write_receive(&callid, &nlen)) { 1162 ipc_answer_0(callid, EINVAL); 1163 ipc_answer_0(rid, EINVAL); 1130 1164 free(old); 1131 ipc_answer_0(rid, rc); 1132 return; 1133 } 1134 1135 size_t olen; 1136 size_t nlen; 1165 return; 1166 } 1167 char *new = malloc(nlen + 1); 1168 if (!new) { 1169 ipc_answer_0(callid, ENOMEM); 1170 ipc_answer_0(rid, ENOMEM); 1171 free(old); 1172 return; 1173 } 1174 if ((rc = async_data_write_finalize(callid, new, nlen))) { 1175 ipc_answer_0(rid, rc); 1176 free(old); 1177 free(new); 1178 return; 1179 } 1180 new[nlen] = '\0'; 1181 1137 1182 char *oldc = canonify(old, &olen); 1138 1183 char *newc = canonify(new, &nlen); 1139 1140 if ((!oldc) || (!newc)) { 1184 if (!oldc || !newc) { 1141 1185 ipc_answer_0(rid, EINVAL); 1142 1186 free(old); … … 1144 1188 return; 1145 1189 } 1146 1147 1190 oldc[olen] = '\0'; 1148 1191 newc[nlen] = '\0'; 1149 1150 1192 if ((!str_lcmp(newc, oldc, str_length(oldc))) && 1151 1193 ((newc[str_length(oldc)] == '/') || … … 1168 1210 vfs_lookup_res_t new_par_lr; 1169 1211 fibril_rwlock_write_lock(&namespace_rwlock); 1170 1171 1212 /* Lookup the node belonging to the old file name. */ 1172 1213 rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); … … 1178 1219 return; 1179 1220 } 1180 1181 1221 vfs_node_t *old_node = vfs_node_get(&old_lr); 1182 1222 if (!old_node) { … … 1187 1227 return; 1188 1228 } 1189 1190 1229 /* Determine the path to the parent of the node with the new name. */ 1191 1230 char *parentc = str_dup(newc); … … 1197 1236 return; 1198 1237 } 1199 1200 1238 char *lastsl = str_rchr(parentc + 1, '/'); 1201 1239 if (lastsl) … … 1203 1241 else 1204 1242 parentc[1] = '\0'; 1205 1206 1243 /* Lookup parent of the new file name. */ 1207 1244 rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); … … 1214 1251 return; 1215 1252 } 1216 1217 1253 /* Check whether linking to the same file system instance. */ 1218 1254 if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || … … 1224 1260 return; 1225 1261 } 1226 1227 1262 /* Destroy the old link for the new name. */ 1228 1263 vfs_node_t *new_node = NULL; 1229 1264 rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); 1230 1231 1265 switch (rc) { 1232 1266 case ENOENT: … … 1253 1287 return; 1254 1288 } 1255 1256 1289 /* Create the new link for the new name. */ 1257 1290 rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); … … 1265 1298 return; 1266 1299 } 1267 1268 1300 fibril_mutex_lock(&nodes_mutex); 1269 1301 old_node->lnkcnt++; 1270 1302 fibril_mutex_unlock(&nodes_mutex); 1271 1272 1303 /* Destroy the link for the old name. */ 1273 1304 rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); … … 1282 1313 return; 1283 1314 } 1284 1285 1315 fibril_mutex_lock(&nodes_mutex); 1286 1316 old_node->lnkcnt--; … … 1288 1318 fibril_rwlock_write_unlock(&namespace_rwlock); 1289 1319 vfs_node_put(old_node); 1290 1291 1320 if (new_node) 1292 1321 vfs_node_put(new_node); 1293 1294 1322 free(old); 1295 1323 free(new);
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