source: mainline/uspace/srv/vfs/vfs_ops.c@ fe2333d

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since fe2333d was c2f4b6b, checked in by Jakub Jermar <jakub@…>, 15 years ago

Take the VFS node's content lock as reader even during writes when it
is safe to do so - i.e. the file system supports concurrent reads/writes
and the write never modifies the node size.
  • Property mode set to 100644
File size: 34.9 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
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
15 * derived from this software without specific prior written permission.
16 *
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
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33/**
34 * @file vfs_ops.c
35 * @brief Operations that VFS offers to its clients.
36 */
37
38#include "vfs.h"
39#include <ipc/ipc.h>
40#include <macros.h>
41#include <stdint.h>
42#include <async.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <str.h>
47#include <bool.h>
48#include <fibril_synch.h>
49#include <adt/list.h>
50#include <unistd.h>
51#include <ctype.h>
52#include <fcntl.h>
53#include <assert.h>
54#include <vfs/canonify.h>
55
56/* Forward declarations of static functions. */
57static int vfs_truncate_internal(fs_handle_t, devmap_handle_t, fs_index_t,
58 aoff64_t);
59
60/**
61 * This rwlock prevents the race between a triplet-to-VFS-node resolution and a
62 * concurrent VFS operation which modifies the file system namespace.
63 */
64FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock);
65
66vfs_pair_t rootfs = {
67 .fs_handle = 0,
68 .devmap_handle = 0
69};
70
71static void vfs_mount_internal(ipc_callid_t rid, devmap_handle_t devmap_handle,
72 fs_handle_t fs_handle, char *mp, char *opts)
73{
74 vfs_lookup_res_t mp_res;
75 vfs_lookup_res_t mr_res;
76 vfs_node_t *mp_node = NULL;
77 vfs_node_t *mr_node;
78 fs_index_t rindex;
79 size_t rsize;
80 unsigned rlnkcnt;
81 ipcarg_t rc;
82 int phone;
83 aid_t msg;
84 ipc_call_t answer;
85
86 /* Resolve the path to the mountpoint. */
87 fibril_rwlock_write_lock(&namespace_rwlock);
88 if (rootfs.fs_handle) {
89 /* We already have the root FS. */
90 if (str_cmp(mp, "/") == 0) {
91 /* Trying to mount root FS over root FS */
92 fibril_rwlock_write_unlock(&namespace_rwlock);
93 ipc_answer_0(rid, EBUSY);
94 return;
95 }
96
97 rc = vfs_lookup_internal(mp, L_MP, &mp_res, NULL);
98 if (rc != EOK) {
99 /* The lookup failed for some reason. */
100 fibril_rwlock_write_unlock(&namespace_rwlock);
101 ipc_answer_0(rid, rc);
102 return;
103 }
104
105 mp_node = vfs_node_get(&mp_res);
106 if (!mp_node) {
107 fibril_rwlock_write_unlock(&namespace_rwlock);
108 ipc_answer_0(rid, ENOMEM);
109 return;
110 }
111
112 /*
113 * Now we hold a reference to mp_node.
114 * It will be dropped upon the corresponding VFS_IN_UNMOUNT.
115 * This prevents the mount point from being deleted.
116 */
117 } else {
118 /* We still don't have the root file system mounted. */
119 if (str_cmp(mp, "/") == 0) {
120 /*
121 * For this simple, but important case,
122 * we are almost done.
123 */
124
125 /* Tell the mountee that it is being mounted. */
126 phone = vfs_grab_phone(fs_handle);
127 msg = async_send_1(phone, VFS_OUT_MOUNTED,
128 (ipcarg_t) devmap_handle, &answer);
129 /* send the mount options */
130 rc = async_data_write_start(phone, (void *)opts,
131 str_size(opts));
132 if (rc != EOK) {
133 async_wait_for(msg, NULL);
134 vfs_release_phone(fs_handle, phone);
135 fibril_rwlock_write_unlock(&namespace_rwlock);
136 ipc_answer_0(rid, rc);
137 return;
138 }
139 async_wait_for(msg, &rc);
140 vfs_release_phone(fs_handle, phone);
141
142 if (rc != EOK) {
143 fibril_rwlock_write_unlock(&namespace_rwlock);
144 ipc_answer_0(rid, rc);
145 return;
146 }
147
148 rindex = (fs_index_t) IPC_GET_ARG1(answer);
149 rsize = (size_t) IPC_GET_ARG2(answer);
150 rlnkcnt = (unsigned) IPC_GET_ARG3(answer);
151
152 mr_res.triplet.fs_handle = fs_handle;
153 mr_res.triplet.devmap_handle = devmap_handle;
154 mr_res.triplet.index = rindex;
155 mr_res.size = rsize;
156 mr_res.lnkcnt = rlnkcnt;
157 mr_res.type = VFS_NODE_DIRECTORY;
158
159 rootfs.fs_handle = fs_handle;
160 rootfs.devmap_handle = devmap_handle;
161
162 /* Add reference to the mounted root. */
163 mr_node = vfs_node_get(&mr_res);
164 assert(mr_node);
165
166 fibril_rwlock_write_unlock(&namespace_rwlock);
167 ipc_answer_0(rid, rc);
168 return;
169 } else {
170 /*
171 * We can't resolve this without the root filesystem
172 * being mounted first.
173 */
174 fibril_rwlock_write_unlock(&namespace_rwlock);
175 ipc_answer_0(rid, ENOENT);
176 return;
177 }
178 }
179
180 /*
181 * At this point, we have all necessary pieces: file system and device
182 * handles, and we know the mount point VFS node.
183 */
184
185 int mountee_phone = vfs_grab_phone(fs_handle);
186 assert(mountee_phone >= 0);
187
188 phone = vfs_grab_phone(mp_res.triplet.fs_handle);
189 msg = async_send_4(phone, VFS_OUT_MOUNT,
190 (ipcarg_t) mp_res.triplet.devmap_handle,
191 (ipcarg_t) mp_res.triplet.index,
192 (ipcarg_t) fs_handle,
193 (ipcarg_t) devmap_handle, &answer);
194
195 /* send connection */
196 rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone);
197 if (rc != EOK) {
198 async_wait_for(msg, NULL);
199 vfs_release_phone(fs_handle, mountee_phone);
200 vfs_release_phone(mp_res.triplet.fs_handle, phone);
201 /* Mount failed, drop reference to mp_node. */
202 if (mp_node)
203 vfs_node_put(mp_node);
204 ipc_answer_0(rid, rc);
205 fibril_rwlock_write_unlock(&namespace_rwlock);
206 return;
207 }
208
209 vfs_release_phone(fs_handle, mountee_phone);
210
211 /* send the mount options */
212 rc = async_data_write_start(phone, (void *)opts, str_size(opts));
213 if (rc != EOK) {
214 async_wait_for(msg, NULL);
215 vfs_release_phone(mp_res.triplet.fs_handle, phone);
216 /* Mount failed, drop reference to mp_node. */
217 if (mp_node)
218 vfs_node_put(mp_node);
219 fibril_rwlock_write_unlock(&namespace_rwlock);
220 ipc_answer_0(rid, rc);
221 return;
222 }
223 async_wait_for(msg, &rc);
224 vfs_release_phone(mp_res.triplet.fs_handle, phone);
225
226 if (rc == EOK) {
227 rindex = (fs_index_t) IPC_GET_ARG1(answer);
228 rsize = (size_t) IPC_GET_ARG2(answer);
229 rlnkcnt = (unsigned) IPC_GET_ARG3(answer);
230
231 mr_res.triplet.fs_handle = fs_handle;
232 mr_res.triplet.devmap_handle = devmap_handle;
233 mr_res.triplet.index = rindex;
234 mr_res.size = rsize;
235 mr_res.lnkcnt = rlnkcnt;
236 mr_res.type = VFS_NODE_DIRECTORY;
237
238 /* Add reference to the mounted root. */
239 mr_node = vfs_node_get(&mr_res);
240 assert(mr_node);
241 } else {
242 /* Mount failed, drop reference to mp_node. */
243 if (mp_node)
244 vfs_node_put(mp_node);
245 }
246
247 ipc_answer_0(rid, rc);
248 fibril_rwlock_write_unlock(&namespace_rwlock);
249}
250
251void vfs_mount(ipc_callid_t rid, ipc_call_t *request)
252{
253 devmap_handle_t devmap_handle;
254
255 /*
256 * We expect the library to do the device-name to device-handle
257 * translation for us, thus the device handle will arrive as ARG1
258 * in the request.
259 */
260 devmap_handle = (devmap_handle_t) IPC_GET_ARG1(*request);
261
262 /*
263 * Mount flags are passed as ARG2.
264 */
265 unsigned int flags = (unsigned int) IPC_GET_ARG2(*request);
266
267 /*
268 * For now, don't make use of ARG3, but it can be used to
269 * carry mount options in the future.
270 */
271
272 /* We want the client to send us the mount point. */
273 char *mp;
274 int rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
275 0, NULL);
276 if (rc != EOK) {
277 ipc_answer_0(rid, rc);
278 return;
279 }
280
281 /* Now we expect to receive the mount options. */
282 char *opts;
283 rc = async_data_write_accept((void **) &opts, true, 0, MAX_MNTOPTS_LEN,
284 0, NULL);
285 if (rc != EOK) {
286 free(mp);
287 ipc_answer_0(rid, rc);
288 return;
289 }
290
291 /*
292 * Now, we expect the client to send us data with the name of the file
293 * system.
294 */
295 char *fs_name;
296 rc = async_data_write_accept((void **) &fs_name, true, 0,
297 FS_NAME_MAXLEN, 0, NULL);
298 if (rc != EOK) {
299 free(mp);
300 free(opts);
301 ipc_answer_0(rid, rc);
302 return;
303 }
304
305 /*
306 * Wait for IPC_M_PING so that we can return an error if we don't know
307 * fs_name.
308 */
309 ipc_call_t data;
310 ipc_callid_t callid = async_get_call(&data);
311 if (IPC_GET_METHOD(data) != IPC_M_PING) {
312 ipc_answer_0(callid, ENOTSUP);
313 ipc_answer_0(rid, ENOTSUP);
314 free(mp);
315 free(opts);
316 free(fs_name);
317 return;
318 }
319
320 /*
321 * Check if we know a file system with the same name as is in fs_name.
322 * This will also give us its file system handle.
323 */
324 fibril_mutex_lock(&fs_head_lock);
325 fs_handle_t fs_handle;
326recheck:
327 fs_handle = fs_name_to_handle(fs_name, false);
328 if (!fs_handle) {
329 if (flags & IPC_FLAG_BLOCKING) {
330 fibril_condvar_wait(&fs_head_cv, &fs_head_lock);
331 goto recheck;
332 }
333
334 fibril_mutex_unlock(&fs_head_lock);
335 ipc_answer_0(callid, ENOENT);
336 ipc_answer_0(rid, ENOENT);
337 free(mp);
338 free(fs_name);
339 free(opts);
340 return;
341 }
342 fibril_mutex_unlock(&fs_head_lock);
343
344 /* Acknowledge that we know fs_name. */
345 ipc_answer_0(callid, EOK);
346
347 /* Do the mount */
348 vfs_mount_internal(rid, devmap_handle, fs_handle, mp, opts);
349 free(mp);
350 free(fs_name);
351 free(opts);
352}
353
354void vfs_unmount(ipc_callid_t rid, ipc_call_t *request)
355{
356 int rc;
357 char *mp;
358 vfs_lookup_res_t mp_res;
359 vfs_lookup_res_t mr_res;
360 vfs_node_t *mr_node;
361 int phone;
362
363 /*
364 * Receive the mount point path.
365 */
366 rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
367 0, NULL);
368 if (rc != EOK)
369 ipc_answer_0(rid, rc);
370
371 /*
372 * Taking the namespace lock will do two things for us. First, it will
373 * prevent races with other lookup operations. Second, it will stop new
374 * references to already existing VFS nodes and creation of new VFS
375 * nodes. This is because new references are added as a result of some
376 * lookup operation or at least of some operation which is protected by
377 * the namespace lock.
378 */
379 fibril_rwlock_write_lock(&namespace_rwlock);
380
381 /*
382 * Lookup the mounted root and instantiate it.
383 */
384 rc = vfs_lookup_internal(mp, L_ROOT, &mr_res, NULL);
385 if (rc != EOK) {
386 fibril_rwlock_write_unlock(&namespace_rwlock);
387 free(mp);
388 ipc_answer_0(rid, rc);
389 return;
390 }
391 mr_node = vfs_node_get(&mr_res);
392 if (!mr_node) {
393 fibril_rwlock_write_unlock(&namespace_rwlock);
394 free(mp);
395 ipc_answer_0(rid, ENOMEM);
396 return;
397 }
398
399 /*
400 * Count the total number of references for the mounted file system. We
401 * are expecting at least two. One which we got above and one which we
402 * got when the file system was mounted. If we find more, it means that
403 * the file system cannot be gracefully unmounted at the moment because
404 * someone is working with it.
405 */
406 if (vfs_nodes_refcount_sum_get(mr_node->fs_handle,
407 mr_node->devmap_handle) != 2) {
408 fibril_rwlock_write_unlock(&namespace_rwlock);
409 vfs_node_put(mr_node);
410 free(mp);
411 ipc_answer_0(rid, EBUSY);
412 return;
413 }
414
415 if (str_cmp(mp, "/") == 0) {
416
417 /*
418 * Unmounting the root file system.
419 *
420 * In this case, there is no mount point node and we send
421 * VFS_OUT_UNMOUNTED directly to the mounted file system.
422 */
423
424 free(mp);
425 phone = vfs_grab_phone(mr_node->fs_handle);
426 rc = async_req_1_0(phone, VFS_OUT_UNMOUNTED,
427 mr_node->devmap_handle);
428 vfs_release_phone(mr_node->fs_handle, phone);
429 if (rc != EOK) {
430 fibril_rwlock_write_unlock(&namespace_rwlock);
431 vfs_node_put(mr_node);
432 ipc_answer_0(rid, rc);
433 return;
434 }
435 rootfs.fs_handle = 0;
436 rootfs.devmap_handle = 0;
437 } else {
438
439 /*
440 * Unmounting a non-root file system.
441 *
442 * We have a regular mount point node representing the parent
443 * file system, so we delegate the operation to it.
444 */
445
446 rc = vfs_lookup_internal(mp, L_MP, &mp_res, NULL);
447 free(mp);
448 if (rc != EOK) {
449 fibril_rwlock_write_unlock(&namespace_rwlock);
450 vfs_node_put(mr_node);
451 ipc_answer_0(rid, rc);
452 return;
453 }
454 vfs_node_t *mp_node = vfs_node_get(&mp_res);
455 if (!mp_node) {
456 fibril_rwlock_write_unlock(&namespace_rwlock);
457 vfs_node_put(mr_node);
458 ipc_answer_0(rid, ENOMEM);
459 return;
460 }
461
462 phone = vfs_grab_phone(mp_node->fs_handle);
463 rc = async_req_2_0(phone, VFS_OUT_UNMOUNT,
464 mp_node->devmap_handle, mp_node->index);
465 vfs_release_phone(mp_node->fs_handle, phone);
466 if (rc != EOK) {
467 fibril_rwlock_write_unlock(&namespace_rwlock);
468 vfs_node_put(mp_node);
469 vfs_node_put(mr_node);
470 ipc_answer_0(rid, rc);
471 return;
472 }
473
474 /* Drop the reference we got above. */
475 vfs_node_put(mp_node);
476 /* Drop the reference from when the file system was mounted. */
477 vfs_node_put(mp_node);
478 }
479
480
481 /*
482 * All went well, the mounted file system was successfully unmounted.
483 * The only thing left is to forget the unmounted root VFS node.
484 */
485 vfs_node_forget(mr_node);
486
487 fibril_rwlock_write_unlock(&namespace_rwlock);
488 ipc_answer_0(rid, EOK);
489}
490
491void vfs_open(ipc_callid_t rid, ipc_call_t *request)
492{
493 if (!vfs_files_init()) {
494 ipc_answer_0(rid, ENOMEM);
495 return;
496 }
497
498 /*
499 * The POSIX interface is open(path, oflag, mode).
500 * We can receive oflags and mode along with the VFS_IN_OPEN call;
501 * the path will need to arrive in another call.
502 *
503 * We also receive one private, non-POSIX set of flags called lflag
504 * used to pass information to vfs_lookup_internal().
505 */
506 int lflag = IPC_GET_ARG1(*request);
507 int oflag = IPC_GET_ARG2(*request);
508 int mode = IPC_GET_ARG3(*request);
509
510 /* Ignore mode for now. */
511 (void) mode;
512
513 /*
514 * Make sure that we are called with exactly one of L_FILE and
515 * L_DIRECTORY. Make sure that the user does not pass L_OPEN,
516 * L_ROOT or L_MP.
517 */
518 if (((lflag & (L_FILE | L_DIRECTORY)) == 0) ||
519 ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) ||
520 (lflag & (L_OPEN | L_ROOT | L_MP))) {
521 ipc_answer_0(rid, EINVAL);
522 return;
523 }
524
525 if (oflag & O_CREAT)
526 lflag |= L_CREATE;
527 if (oflag & O_EXCL)
528 lflag |= L_EXCLUSIVE;
529
530 char *path;
531 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
532 if (rc != EOK) {
533 ipc_answer_0(rid, rc);
534 return;
535 }
536
537 /*
538 * Avoid the race condition in which the file can be deleted before we
539 * find/create-and-lock the VFS node corresponding to the looked-up
540 * triplet.
541 */
542 if (lflag & L_CREATE)
543 fibril_rwlock_write_lock(&namespace_rwlock);
544 else
545 fibril_rwlock_read_lock(&namespace_rwlock);
546
547 /* The path is now populated and we can call vfs_lookup_internal(). */
548 vfs_lookup_res_t lr;
549 rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL);
550 if (rc != EOK) {
551 if (lflag & L_CREATE)
552 fibril_rwlock_write_unlock(&namespace_rwlock);
553 else
554 fibril_rwlock_read_unlock(&namespace_rwlock);
555 ipc_answer_0(rid, rc);
556 free(path);
557 return;
558 }
559
560 /* Path is no longer needed. */
561 free(path);
562
563 vfs_node_t *node = vfs_node_get(&lr);
564 if (lflag & L_CREATE)
565 fibril_rwlock_write_unlock(&namespace_rwlock);
566 else
567 fibril_rwlock_read_unlock(&namespace_rwlock);
568
569 /* Truncate the file if requested and if necessary. */
570 if (oflag & O_TRUNC) {
571 fibril_rwlock_write_lock(&node->contents_rwlock);
572 if (node->size) {
573 rc = vfs_truncate_internal(node->fs_handle,
574 node->devmap_handle, node->index, 0);
575 if (rc) {
576 fibril_rwlock_write_unlock(&node->contents_rwlock);
577 vfs_node_put(node);
578 ipc_answer_0(rid, rc);
579 return;
580 }
581 node->size = 0;
582 }
583 fibril_rwlock_write_unlock(&node->contents_rwlock);
584 }
585
586 /*
587 * Get ourselves a file descriptor and the corresponding vfs_file_t
588 * structure.
589 */
590 int fd = vfs_fd_alloc((oflag & O_DESC) != 0);
591 if (fd < 0) {
592 vfs_node_put(node);
593 ipc_answer_0(rid, fd);
594 return;
595 }
596 vfs_file_t *file = vfs_file_get(fd);
597 assert(file);
598 file->node = node;
599 if (oflag & O_APPEND)
600 file->append = true;
601
602 /*
603 * The following increase in reference count is for the fact that the
604 * file is being opened and that a file structure is pointing to it.
605 * It is necessary so that the file will not disappear when
606 * vfs_node_put() is called. The reference will be dropped by the
607 * respective VFS_IN_CLOSE.
608 */
609 vfs_node_addref(node);
610 vfs_node_put(node);
611
612 /* Success! Return the new file descriptor to the client. */
613 ipc_answer_1(rid, EOK, fd);
614}
615
616void vfs_open_node(ipc_callid_t rid, ipc_call_t *request)
617{
618 // FIXME: check for sanity of the supplied fs, dev and index
619
620 if (!vfs_files_init()) {
621 ipc_answer_0(rid, ENOMEM);
622 return;
623 }
624
625 /*
626 * The interface is open_node(fs, dev, index, oflag).
627 */
628 vfs_lookup_res_t lr;
629
630 lr.triplet.fs_handle = IPC_GET_ARG1(*request);
631 lr.triplet.devmap_handle = IPC_GET_ARG2(*request);
632 lr.triplet.index = IPC_GET_ARG3(*request);
633 int oflag = IPC_GET_ARG4(*request);
634
635 fibril_rwlock_read_lock(&namespace_rwlock);
636
637 int rc = vfs_open_node_internal(&lr);
638 if (rc != EOK) {
639 fibril_rwlock_read_unlock(&namespace_rwlock);
640 ipc_answer_0(rid, rc);
641 return;
642 }
643
644 vfs_node_t *node = vfs_node_get(&lr);
645 fibril_rwlock_read_unlock(&namespace_rwlock);
646
647 /* Truncate the file if requested and if necessary. */
648 if (oflag & O_TRUNC) {
649 fibril_rwlock_write_lock(&node->contents_rwlock);
650 if (node->size) {
651 rc = vfs_truncate_internal(node->fs_handle,
652 node->devmap_handle, node->index, 0);
653 if (rc) {
654 fibril_rwlock_write_unlock(&node->contents_rwlock);
655 vfs_node_put(node);
656 ipc_answer_0(rid, rc);
657 return;
658 }
659 node->size = 0;
660 }
661 fibril_rwlock_write_unlock(&node->contents_rwlock);
662 }
663
664 /*
665 * Get ourselves a file descriptor and the corresponding vfs_file_t
666 * structure.
667 */
668 int fd = vfs_fd_alloc((oflag & O_DESC) != 0);
669 if (fd < 0) {
670 vfs_node_put(node);
671 ipc_answer_0(rid, fd);
672 return;
673 }
674 vfs_file_t *file = vfs_file_get(fd);
675 file->node = node;
676 if (oflag & O_APPEND)
677 file->append = true;
678
679 /*
680 * The following increase in reference count is for the fact that the
681 * file is being opened and that a file structure is pointing to it.
682 * It is necessary so that the file will not disappear when
683 * vfs_node_put() is called. The reference will be dropped by the
684 * respective VFS_IN_CLOSE.
685 */
686 vfs_node_addref(node);
687 vfs_node_put(node);
688
689 /* Success! Return the new file descriptor to the client. */
690 ipc_answer_1(rid, EOK, fd);
691}
692
693void vfs_sync(ipc_callid_t rid, ipc_call_t *request)
694{
695 int fd = IPC_GET_ARG1(*request);
696
697 /* Lookup the file structure corresponding to the file descriptor. */
698 vfs_file_t *file = vfs_file_get(fd);
699 if (!file) {
700 ipc_answer_0(rid, ENOENT);
701 return;
702 }
703
704 /*
705 * Lock the open file structure so that no other thread can manipulate
706 * the same open file at a time.
707 */
708 fibril_mutex_lock(&file->lock);
709 int fs_phone = vfs_grab_phone(file->node->fs_handle);
710
711 /* Make a VFS_OUT_SYMC request at the destination FS server. */
712 aid_t msg;
713 ipc_call_t answer;
714 msg = async_send_2(fs_phone, VFS_OUT_SYNC, file->node->devmap_handle,
715 file->node->index, &answer);
716
717 /* Wait for reply from the FS server. */
718 ipcarg_t rc;
719 async_wait_for(msg, &rc);
720
721 vfs_release_phone(file->node->fs_handle, fs_phone);
722 fibril_mutex_unlock(&file->lock);
723
724 ipc_answer_0(rid, rc);
725}
726
727int vfs_close_internal(vfs_file_t *file)
728{
729 /*
730 * Lock the open file structure so that no other thread can manipulate
731 * the same open file at a time.
732 */
733 fibril_mutex_lock(&file->lock);
734
735 if (file->refcnt <= 1) {
736 /* Only close the file on the destination FS server
737 if there are no more file descriptors (except the
738 present one) pointing to this file. */
739
740 int fs_phone = vfs_grab_phone(file->node->fs_handle);
741
742 /* Make a VFS_OUT_CLOSE request at the destination FS server. */
743 aid_t msg;
744 ipc_call_t answer;
745 msg = async_send_2(fs_phone, VFS_OUT_CLOSE,
746 file->node->devmap_handle, file->node->index, &answer);
747
748 /* Wait for reply from the FS server. */
749 ipcarg_t rc;
750 async_wait_for(msg, &rc);
751
752 vfs_release_phone(file->node->fs_handle, fs_phone);
753 fibril_mutex_unlock(&file->lock);
754
755 return IPC_GET_ARG1(answer);
756 }
757
758 fibril_mutex_unlock(&file->lock);
759 return EOK;
760}
761
762void vfs_close(ipc_callid_t rid, ipc_call_t *request)
763{
764 int fd = IPC_GET_ARG1(*request);
765
766 /* Lookup the file structure corresponding to the file descriptor. */
767 vfs_file_t *file = vfs_file_get(fd);
768 if (!file) {
769 ipc_answer_0(rid, ENOENT);
770 return;
771 }
772
773 int ret = vfs_close_internal(file);
774 if (ret != EOK)
775 ipc_answer_0(rid, ret);
776
777 ret = vfs_fd_free(fd);
778 ipc_answer_0(rid, ret);
779}
780
781static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read)
782{
783 vfs_info_t *vi;
784
785 /*
786 * The following code strongly depends on the fact that the files data
787 * structure can be only accessed by a single fibril and all file
788 * operations are serialized (i.e. the reads and writes cannot
789 * interleave and a file cannot be closed while it is being read).
790 *
791 * Additional synchronization needs to be added once the table of
792 * open files supports parallel access!
793 */
794
795 int fd = IPC_GET_ARG1(*request);
796
797 /* Lookup the file structure corresponding to the file descriptor. */
798 vfs_file_t *file = vfs_file_get(fd);
799 if (!file) {
800 ipc_answer_0(rid, ENOENT);
801 return;
802 }
803
804 /*
805 * Lock the open file structure so that no other thread can manipulate
806 * the same open file at a time.
807 */
808 fibril_mutex_lock(&file->lock);
809
810 vi = fs_handle_to_info(file->node->fs_handle);
811 assert(vi);
812
813 /*
814 * Lock the file's node so that no other client can read/write to it at
815 * the same time unless the FS supports concurrent reads/writes and its
816 * write implementation does not modify the file size.
817 */
818 if (read || (vi->concurrent_read_write && vi->write_retains_size))
819 fibril_rwlock_read_lock(&file->node->contents_rwlock);
820 else
821 fibril_rwlock_write_lock(&file->node->contents_rwlock);
822
823 if (file->node->type == VFS_NODE_DIRECTORY) {
824 /*
825 * Make sure that no one is modifying the namespace
826 * while we are in readdir().
827 */
828 assert(read);
829 fibril_rwlock_read_lock(&namespace_rwlock);
830 }
831
832 int fs_phone = vfs_grab_phone(file->node->fs_handle);
833
834 /*
835 * Make a VFS_READ/VFS_WRITE request at the destination FS server
836 * and forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the
837 * destination FS server. The call will be routed as if sent by
838 * ourselves. Note that call arguments are immutable in this case so we
839 * don't have to bother.
840 */
841 ipcarg_t rc;
842 ipc_call_t answer;
843 if (read) {
844 rc = async_data_read_forward_3_1(fs_phone, VFS_OUT_READ,
845 file->node->devmap_handle, file->node->index, file->pos,
846 &answer);
847 } else {
848 if (file->append)
849 file->pos = file->node->size;
850
851 rc = async_data_write_forward_3_1(fs_phone, VFS_OUT_WRITE,
852 file->node->devmap_handle, file->node->index, file->pos,
853 &answer);
854 }
855
856 vfs_release_phone(file->node->fs_handle, fs_phone);
857
858 size_t bytes = IPC_GET_ARG1(answer);
859
860 if (file->node->type == VFS_NODE_DIRECTORY)
861 fibril_rwlock_read_unlock(&namespace_rwlock);
862
863 /* Unlock the VFS node. */
864 if (read || (vi->concurrent_read_write && vi->write_retains_size))
865 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
866 else {
867 /* Update the cached version of node's size. */
868 if (rc == EOK)
869 file->node->size = IPC_GET_ARG2(answer);
870 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
871 }
872
873 /* Update the position pointer and unlock the open file. */
874 if (rc == EOK)
875 file->pos += bytes;
876 fibril_mutex_unlock(&file->lock);
877
878 /*
879 * FS server's reply is the final result of the whole operation we
880 * return to the client.
881 */
882 ipc_answer_1(rid, rc, bytes);
883}
884
885void vfs_read(ipc_callid_t rid, ipc_call_t *request)
886{
887 vfs_rdwr(rid, request, true);
888}
889
890void vfs_write(ipc_callid_t rid, ipc_call_t *request)
891{
892 vfs_rdwr(rid, request, false);
893}
894
895void vfs_seek(ipc_callid_t rid, ipc_call_t *request)
896{
897 int fd = (int) IPC_GET_ARG1(*request);
898 off64_t off = (off64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
899 IPC_GET_ARG3(*request));
900 int whence = (int) IPC_GET_ARG4(*request);
901
902 /* Lookup the file structure corresponding to the file descriptor. */
903 vfs_file_t *file = vfs_file_get(fd);
904 if (!file) {
905 ipc_answer_0(rid, ENOENT);
906 return;
907 }
908
909 fibril_mutex_lock(&file->lock);
910
911 off64_t newoff;
912 switch (whence) {
913 case SEEK_SET:
914 if (off >= 0) {
915 file->pos = (aoff64_t) off;
916 fibril_mutex_unlock(&file->lock);
917 ipc_answer_1(rid, EOK, off);
918 return;
919 }
920 break;
921 case SEEK_CUR:
922 if ((off >= 0) && (file->pos + off < file->pos)) {
923 fibril_mutex_unlock(&file->lock);
924 ipc_answer_0(rid, EOVERFLOW);
925 return;
926 }
927
928 if ((off < 0) && (file->pos < (aoff64_t) -off)) {
929 fibril_mutex_unlock(&file->lock);
930 ipc_answer_0(rid, EOVERFLOW);
931 return;
932 }
933
934 file->pos += off;
935 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
936
937 fibril_mutex_unlock(&file->lock);
938 ipc_answer_2(rid, EOK, LOWER32(newoff),
939 UPPER32(newoff));
940 return;
941 case SEEK_END:
942 fibril_rwlock_read_lock(&file->node->contents_rwlock);
943 aoff64_t size = file->node->size;
944
945 if ((off >= 0) && (size + off < size)) {
946 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
947 fibril_mutex_unlock(&file->lock);
948 ipc_answer_0(rid, EOVERFLOW);
949 return;
950 }
951
952 if ((off < 0) && (size < (aoff64_t) -off)) {
953 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
954 fibril_mutex_unlock(&file->lock);
955 ipc_answer_0(rid, EOVERFLOW);
956 return;
957 }
958
959 file->pos = size + off;
960 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
961
962 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
963 fibril_mutex_unlock(&file->lock);
964 ipc_answer_2(rid, EOK, LOWER32(newoff), UPPER32(newoff));
965 return;
966 }
967
968 fibril_mutex_unlock(&file->lock);
969 ipc_answer_0(rid, EINVAL);
970}
971
972int vfs_truncate_internal(fs_handle_t fs_handle, devmap_handle_t devmap_handle,
973 fs_index_t index, aoff64_t size)
974{
975 ipcarg_t rc;
976 int fs_phone;
977
978 fs_phone = vfs_grab_phone(fs_handle);
979 rc = async_req_4_0(fs_phone, VFS_OUT_TRUNCATE, (ipcarg_t) devmap_handle,
980 (ipcarg_t) index, LOWER32(size), UPPER32(size));
981 vfs_release_phone(fs_handle, fs_phone);
982 return (int)rc;
983}
984
985void vfs_truncate(ipc_callid_t rid, ipc_call_t *request)
986{
987 int fd = IPC_GET_ARG1(*request);
988 aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
989 IPC_GET_ARG3(*request));
990 int rc;
991
992 vfs_file_t *file = vfs_file_get(fd);
993 if (!file) {
994 ipc_answer_0(rid, ENOENT);
995 return;
996 }
997 fibril_mutex_lock(&file->lock);
998
999 fibril_rwlock_write_lock(&file->node->contents_rwlock);
1000 rc = vfs_truncate_internal(file->node->fs_handle,
1001 file->node->devmap_handle, file->node->index, size);
1002 if (rc == EOK)
1003 file->node->size = size;
1004 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
1005
1006 fibril_mutex_unlock(&file->lock);
1007 ipc_answer_0(rid, (ipcarg_t)rc);
1008}
1009
1010void vfs_fstat(ipc_callid_t rid, ipc_call_t *request)
1011{
1012 int fd = IPC_GET_ARG1(*request);
1013 ipcarg_t rc;
1014
1015 vfs_file_t *file = vfs_file_get(fd);
1016 if (!file) {
1017 ipc_answer_0(rid, ENOENT);
1018 return;
1019 }
1020
1021 ipc_callid_t callid;
1022 if (!async_data_read_receive(&callid, NULL)) {
1023 ipc_answer_0(callid, EINVAL);
1024 ipc_answer_0(rid, EINVAL);
1025 return;
1026 }
1027
1028 fibril_mutex_lock(&file->lock);
1029
1030 int fs_phone = vfs_grab_phone(file->node->fs_handle);
1031
1032 aid_t msg;
1033 msg = async_send_3(fs_phone, VFS_OUT_STAT, file->node->devmap_handle,
1034 file->node->index, true, NULL);
1035 ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1036 async_wait_for(msg, &rc);
1037 vfs_release_phone(file->node->fs_handle, fs_phone);
1038
1039 fibril_mutex_unlock(&file->lock);
1040 ipc_answer_0(rid, rc);
1041}
1042
1043void vfs_stat(ipc_callid_t rid, ipc_call_t *request)
1044{
1045 char *path;
1046 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1047 if (rc != EOK) {
1048 ipc_answer_0(rid, rc);
1049 return;
1050 }
1051
1052 ipc_callid_t callid;
1053 if (!async_data_read_receive(&callid, NULL)) {
1054 free(path);
1055 ipc_answer_0(callid, EINVAL);
1056 ipc_answer_0(rid, EINVAL);
1057 return;
1058 }
1059
1060 vfs_lookup_res_t lr;
1061 fibril_rwlock_read_lock(&namespace_rwlock);
1062 rc = vfs_lookup_internal(path, L_NONE, &lr, NULL);
1063 free(path);
1064 if (rc != EOK) {
1065 fibril_rwlock_read_unlock(&namespace_rwlock);
1066 ipc_answer_0(callid, rc);
1067 ipc_answer_0(rid, rc);
1068 return;
1069 }
1070 vfs_node_t *node = vfs_node_get(&lr);
1071 if (!node) {
1072 fibril_rwlock_read_unlock(&namespace_rwlock);
1073 ipc_answer_0(callid, ENOMEM);
1074 ipc_answer_0(rid, ENOMEM);
1075 return;
1076 }
1077
1078 fibril_rwlock_read_unlock(&namespace_rwlock);
1079
1080 int fs_phone = vfs_grab_phone(node->fs_handle);
1081 aid_t msg;
1082 msg = async_send_3(fs_phone, VFS_OUT_STAT, node->devmap_handle,
1083 node->index, false, NULL);
1084 ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1085
1086 ipcarg_t rv;
1087 async_wait_for(msg, &rv);
1088 vfs_release_phone(node->fs_handle, fs_phone);
1089
1090 ipc_answer_0(rid, rv);
1091
1092 vfs_node_put(node);
1093}
1094
1095void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request)
1096{
1097 int mode = IPC_GET_ARG1(*request);
1098
1099 char *path;
1100 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1101 if (rc != EOK) {
1102 ipc_answer_0(rid, rc);
1103 return;
1104 }
1105
1106 /* Ignore mode for now. */
1107 (void) mode;
1108
1109 fibril_rwlock_write_lock(&namespace_rwlock);
1110 int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE;
1111 rc = vfs_lookup_internal(path, lflag, NULL, NULL);
1112 fibril_rwlock_write_unlock(&namespace_rwlock);
1113 free(path);
1114 ipc_answer_0(rid, rc);
1115}
1116
1117void vfs_unlink(ipc_callid_t rid, ipc_call_t *request)
1118{
1119 int lflag = IPC_GET_ARG1(*request);
1120
1121 char *path;
1122 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1123 if (rc != EOK) {
1124 ipc_answer_0(rid, rc);
1125 return;
1126 }
1127
1128 fibril_rwlock_write_lock(&namespace_rwlock);
1129 lflag &= L_DIRECTORY; /* sanitize lflag */
1130 vfs_lookup_res_t lr;
1131 rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL);
1132 free(path);
1133 if (rc != EOK) {
1134 fibril_rwlock_write_unlock(&namespace_rwlock);
1135 ipc_answer_0(rid, rc);
1136 return;
1137 }
1138
1139 /*
1140 * The name has already been unlinked by vfs_lookup_internal().
1141 * We have to get and put the VFS node to ensure that it is
1142 * VFS_OUT_DESTROY'ed after the last reference to it is dropped.
1143 */
1144 vfs_node_t *node = vfs_node_get(&lr);
1145 fibril_mutex_lock(&nodes_mutex);
1146 node->lnkcnt--;
1147 fibril_mutex_unlock(&nodes_mutex);
1148 fibril_rwlock_write_unlock(&namespace_rwlock);
1149 vfs_node_put(node);
1150 ipc_answer_0(rid, EOK);
1151}
1152
1153void vfs_rename(ipc_callid_t rid, ipc_call_t *request)
1154{
1155 /* Retrieve the old path. */
1156 char *old;
1157 int rc = async_data_write_accept((void **) &old, true, 0, 0, 0, NULL);
1158 if (rc != EOK) {
1159 ipc_answer_0(rid, rc);
1160 return;
1161 }
1162
1163 /* Retrieve the new path. */
1164 char *new;
1165 rc = async_data_write_accept((void **) &new, true, 0, 0, 0, NULL);
1166 if (rc != EOK) {
1167 free(old);
1168 ipc_answer_0(rid, rc);
1169 return;
1170 }
1171
1172 size_t olen;
1173 size_t nlen;
1174 char *oldc = canonify(old, &olen);
1175 char *newc = canonify(new, &nlen);
1176
1177 if ((!oldc) || (!newc)) {
1178 ipc_answer_0(rid, EINVAL);
1179 free(old);
1180 free(new);
1181 return;
1182 }
1183
1184 oldc[olen] = '\0';
1185 newc[nlen] = '\0';
1186
1187 if ((!str_lcmp(newc, oldc, str_length(oldc))) &&
1188 ((newc[str_length(oldc)] == '/') ||
1189 (str_length(oldc) == 1) ||
1190 (str_length(oldc) == str_length(newc)))) {
1191 /*
1192 * oldc is a prefix of newc and either
1193 * - newc continues with a / where oldc ends, or
1194 * - oldc was / itself, or
1195 * - oldc and newc are equal.
1196 */
1197 ipc_answer_0(rid, EINVAL);
1198 free(old);
1199 free(new);
1200 return;
1201 }
1202
1203 vfs_lookup_res_t old_lr;
1204 vfs_lookup_res_t new_lr;
1205 vfs_lookup_res_t new_par_lr;
1206 fibril_rwlock_write_lock(&namespace_rwlock);
1207
1208 /* Lookup the node belonging to the old file name. */
1209 rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL);
1210 if (rc != EOK) {
1211 fibril_rwlock_write_unlock(&namespace_rwlock);
1212 ipc_answer_0(rid, rc);
1213 free(old);
1214 free(new);
1215 return;
1216 }
1217
1218 vfs_node_t *old_node = vfs_node_get(&old_lr);
1219 if (!old_node) {
1220 fibril_rwlock_write_unlock(&namespace_rwlock);
1221 ipc_answer_0(rid, ENOMEM);
1222 free(old);
1223 free(new);
1224 return;
1225 }
1226
1227 /* Determine the path to the parent of the node with the new name. */
1228 char *parentc = str_dup(newc);
1229 if (!parentc) {
1230 fibril_rwlock_write_unlock(&namespace_rwlock);
1231 ipc_answer_0(rid, rc);
1232 free(old);
1233 free(new);
1234 return;
1235 }
1236
1237 char *lastsl = str_rchr(parentc + 1, '/');
1238 if (lastsl)
1239 *lastsl = '\0';
1240 else
1241 parentc[1] = '\0';
1242
1243 /* Lookup parent of the new file name. */
1244 rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL);
1245 free(parentc); /* not needed anymore */
1246 if (rc != EOK) {
1247 fibril_rwlock_write_unlock(&namespace_rwlock);
1248 ipc_answer_0(rid, rc);
1249 free(old);
1250 free(new);
1251 return;
1252 }
1253
1254 /* Check whether linking to the same file system instance. */
1255 if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) ||
1256 (old_node->devmap_handle != new_par_lr.triplet.devmap_handle)) {
1257 fibril_rwlock_write_unlock(&namespace_rwlock);
1258 ipc_answer_0(rid, EXDEV); /* different file systems */
1259 free(old);
1260 free(new);
1261 return;
1262 }
1263
1264 /* Destroy the old link for the new name. */
1265 vfs_node_t *new_node = NULL;
1266 rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL);
1267
1268 switch (rc) {
1269 case ENOENT:
1270 /* simply not in our way */
1271 break;
1272 case EOK:
1273 new_node = vfs_node_get(&new_lr);
1274 if (!new_node) {
1275 fibril_rwlock_write_unlock(&namespace_rwlock);
1276 ipc_answer_0(rid, ENOMEM);
1277 free(old);
1278 free(new);
1279 return;
1280 }
1281 fibril_mutex_lock(&nodes_mutex);
1282 new_node->lnkcnt--;
1283 fibril_mutex_unlock(&nodes_mutex);
1284 break;
1285 default:
1286 fibril_rwlock_write_unlock(&namespace_rwlock);
1287 ipc_answer_0(rid, ENOTEMPTY);
1288 free(old);
1289 free(new);
1290 return;
1291 }
1292
1293 /* Create the new link for the new name. */
1294 rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index);
1295 if (rc != EOK) {
1296 fibril_rwlock_write_unlock(&namespace_rwlock);
1297 if (new_node)
1298 vfs_node_put(new_node);
1299 ipc_answer_0(rid, rc);
1300 free(old);
1301 free(new);
1302 return;
1303 }
1304
1305 fibril_mutex_lock(&nodes_mutex);
1306 old_node->lnkcnt++;
1307 fibril_mutex_unlock(&nodes_mutex);
1308
1309 /* Destroy the link for the old name. */
1310 rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL);
1311 if (rc != EOK) {
1312 fibril_rwlock_write_unlock(&namespace_rwlock);
1313 vfs_node_put(old_node);
1314 if (new_node)
1315 vfs_node_put(new_node);
1316 ipc_answer_0(rid, rc);
1317 free(old);
1318 free(new);
1319 return;
1320 }
1321
1322 fibril_mutex_lock(&nodes_mutex);
1323 old_node->lnkcnt--;
1324 fibril_mutex_unlock(&nodes_mutex);
1325 fibril_rwlock_write_unlock(&namespace_rwlock);
1326 vfs_node_put(old_node);
1327
1328 if (new_node)
1329 vfs_node_put(new_node);
1330
1331 free(old);
1332 free(new);
1333 ipc_answer_0(rid, EOK);
1334}
1335
1336void vfs_dup(ipc_callid_t rid, ipc_call_t *request)
1337{
1338 int oldfd = IPC_GET_ARG1(*request);
1339 int newfd = IPC_GET_ARG2(*request);
1340
1341 /* Lookup the file structure corresponding to oldfd. */
1342 vfs_file_t *oldfile = vfs_file_get(oldfd);
1343 if (!oldfile) {
1344 ipc_answer_0(rid, EBADF);
1345 return;
1346 }
1347
1348 /* If the file descriptors are the same, do nothing. */
1349 if (oldfd == newfd) {
1350 ipc_answer_1(rid, EOK, newfd);
1351 return;
1352 }
1353
1354 /*
1355 * Lock the open file structure so that no other thread can manipulate
1356 * the same open file at a time.
1357 */
1358 fibril_mutex_lock(&oldfile->lock);
1359
1360 /* Lookup an open file structure possibly corresponding to newfd. */
1361 vfs_file_t *newfile = vfs_file_get(newfd);
1362 if (newfile) {
1363 /* Close the originally opened file. */
1364 int ret = vfs_close_internal(newfile);
1365 if (ret != EOK) {
1366 fibril_mutex_unlock(&oldfile->lock);
1367 ipc_answer_0(rid, ret);
1368 return;
1369 }
1370
1371 ret = vfs_fd_free(newfd);
1372 if (ret != EOK) {
1373 fibril_mutex_unlock(&oldfile->lock);
1374 ipc_answer_0(rid, ret);
1375 return;
1376 }
1377 }
1378
1379 /* Assign the old file to newfd. */
1380 int ret = vfs_fd_assign(oldfile, newfd);
1381 fibril_mutex_unlock(&oldfile->lock);
1382
1383 if (ret != EOK)
1384 ipc_answer_0(rid, ret);
1385 else
1386 ipc_answer_1(rid, EOK, newfd);
1387}
1388
1389/**
1390 * @}
1391 */
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