source: mainline/uspace/srv/vfs/vfs_ops.c@ 1f5c1e61

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 1f5c1e61 was 4fe94c66, checked in by Jakub Jermar <jakub@…>, 15 years ago

Now when the table of open files is shared by multiple connections of
one client task, it became necessary to maintain the vfs_file_t
references obtained from vfs_file_get() explicitly.
  • Property mode set to 100644
File size: 35.2 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 sysarg_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 (sysarg_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 (sysarg_t) mp_res.triplet.devmap_handle,
191 (sysarg_t) mp_res.triplet.index,
192 (sysarg_t) fs_handle,
193 (sysarg_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_IMETHOD(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 /*
494 * The POSIX interface is open(path, oflag, mode).
495 * We can receive oflags and mode along with the VFS_IN_OPEN call;
496 * the path will need to arrive in another call.
497 *
498 * We also receive one private, non-POSIX set of flags called lflag
499 * used to pass information to vfs_lookup_internal().
500 */
501 int lflag = IPC_GET_ARG1(*request);
502 int oflag = IPC_GET_ARG2(*request);
503 int mode = IPC_GET_ARG3(*request);
504
505 /* Ignore mode for now. */
506 (void) mode;
507
508 /*
509 * Make sure that we are called with exactly one of L_FILE and
510 * L_DIRECTORY. Make sure that the user does not pass L_OPEN,
511 * L_ROOT or L_MP.
512 */
513 if (((lflag & (L_FILE | L_DIRECTORY)) == 0) ||
514 ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) ||
515 (lflag & (L_OPEN | L_ROOT | L_MP))) {
516 ipc_answer_0(rid, EINVAL);
517 return;
518 }
519
520 if (oflag & O_CREAT)
521 lflag |= L_CREATE;
522 if (oflag & O_EXCL)
523 lflag |= L_EXCLUSIVE;
524
525 char *path;
526 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
527 if (rc != EOK) {
528 ipc_answer_0(rid, rc);
529 return;
530 }
531
532 /*
533 * Avoid the race condition in which the file can be deleted before we
534 * find/create-and-lock the VFS node corresponding to the looked-up
535 * triplet.
536 */
537 if (lflag & L_CREATE)
538 fibril_rwlock_write_lock(&namespace_rwlock);
539 else
540 fibril_rwlock_read_lock(&namespace_rwlock);
541
542 /* The path is now populated and we can call vfs_lookup_internal(). */
543 vfs_lookup_res_t lr;
544 rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL);
545 if (rc != EOK) {
546 if (lflag & L_CREATE)
547 fibril_rwlock_write_unlock(&namespace_rwlock);
548 else
549 fibril_rwlock_read_unlock(&namespace_rwlock);
550 ipc_answer_0(rid, rc);
551 free(path);
552 return;
553 }
554
555 /* Path is no longer needed. */
556 free(path);
557
558 vfs_node_t *node = vfs_node_get(&lr);
559 if (lflag & L_CREATE)
560 fibril_rwlock_write_unlock(&namespace_rwlock);
561 else
562 fibril_rwlock_read_unlock(&namespace_rwlock);
563
564 /* Truncate the file if requested and if necessary. */
565 if (oflag & O_TRUNC) {
566 fibril_rwlock_write_lock(&node->contents_rwlock);
567 if (node->size) {
568 rc = vfs_truncate_internal(node->fs_handle,
569 node->devmap_handle, node->index, 0);
570 if (rc) {
571 fibril_rwlock_write_unlock(&node->contents_rwlock);
572 vfs_node_put(node);
573 ipc_answer_0(rid, rc);
574 return;
575 }
576 node->size = 0;
577 }
578 fibril_rwlock_write_unlock(&node->contents_rwlock);
579 }
580
581 /*
582 * Get ourselves a file descriptor and the corresponding vfs_file_t
583 * structure.
584 */
585 int fd = vfs_fd_alloc((oflag & O_DESC) != 0);
586 if (fd < 0) {
587 vfs_node_put(node);
588 ipc_answer_0(rid, fd);
589 return;
590 }
591 vfs_file_t *file = vfs_file_get(fd);
592 assert(file);
593 file->node = node;
594 if (oflag & O_APPEND)
595 file->append = true;
596
597 /*
598 * The following increase in reference count is for the fact that the
599 * file is being opened and that a file structure is pointing to it.
600 * It is necessary so that the file will not disappear when
601 * vfs_node_put() is called. The reference will be dropped by the
602 * respective VFS_IN_CLOSE.
603 */
604 vfs_node_addref(node);
605 vfs_node_put(node);
606 vfs_file_put(file);
607
608 /* Success! Return the new file descriptor to the client. */
609 ipc_answer_1(rid, EOK, fd);
610}
611
612void vfs_open_node(ipc_callid_t rid, ipc_call_t *request)
613{
614 // FIXME: check for sanity of the supplied fs, dev and index
615
616 /*
617 * The interface is open_node(fs, dev, index, oflag).
618 */
619 vfs_lookup_res_t lr;
620
621 lr.triplet.fs_handle = IPC_GET_ARG1(*request);
622 lr.triplet.devmap_handle = IPC_GET_ARG2(*request);
623 lr.triplet.index = IPC_GET_ARG3(*request);
624 int oflag = IPC_GET_ARG4(*request);
625
626 fibril_rwlock_read_lock(&namespace_rwlock);
627
628 int rc = vfs_open_node_internal(&lr);
629 if (rc != EOK) {
630 fibril_rwlock_read_unlock(&namespace_rwlock);
631 ipc_answer_0(rid, rc);
632 return;
633 }
634
635 vfs_node_t *node = vfs_node_get(&lr);
636 fibril_rwlock_read_unlock(&namespace_rwlock);
637
638 /* Truncate the file if requested and if necessary. */
639 if (oflag & O_TRUNC) {
640 fibril_rwlock_write_lock(&node->contents_rwlock);
641 if (node->size) {
642 rc = vfs_truncate_internal(node->fs_handle,
643 node->devmap_handle, node->index, 0);
644 if (rc) {
645 fibril_rwlock_write_unlock(&node->contents_rwlock);
646 vfs_node_put(node);
647 ipc_answer_0(rid, rc);
648 return;
649 }
650 node->size = 0;
651 }
652 fibril_rwlock_write_unlock(&node->contents_rwlock);
653 }
654
655 /*
656 * Get ourselves a file descriptor and the corresponding vfs_file_t
657 * structure.
658 */
659 int fd = vfs_fd_alloc((oflag & O_DESC) != 0);
660 if (fd < 0) {
661 vfs_node_put(node);
662 ipc_answer_0(rid, fd);
663 return;
664 }
665 vfs_file_t *file = vfs_file_get(fd);
666 file->node = node;
667 if (oflag & O_APPEND)
668 file->append = true;
669
670 /*
671 * The following increase in reference count is for the fact that the
672 * file is being opened and that a file structure is pointing to it.
673 * It is necessary so that the file will not disappear when
674 * vfs_node_put() is called. The reference will be dropped by the
675 * respective VFS_IN_CLOSE.
676 */
677 vfs_node_addref(node);
678 vfs_node_put(node);
679 vfs_file_put(file);
680
681 /* Success! Return the new file descriptor to the client. */
682 ipc_answer_1(rid, EOK, fd);
683}
684
685void vfs_sync(ipc_callid_t rid, ipc_call_t *request)
686{
687 int fd = IPC_GET_ARG1(*request);
688
689 /* Lookup the file structure corresponding to the file descriptor. */
690 vfs_file_t *file = vfs_file_get(fd);
691 if (!file) {
692 ipc_answer_0(rid, ENOENT);
693 return;
694 }
695
696 /*
697 * Lock the open file structure so that no other thread can manipulate
698 * the same open file at a time.
699 */
700 fibril_mutex_lock(&file->lock);
701 int fs_phone = vfs_grab_phone(file->node->fs_handle);
702
703 /* Make a VFS_OUT_SYMC request at the destination FS server. */
704 aid_t msg;
705 ipc_call_t answer;
706 msg = async_send_2(fs_phone, VFS_OUT_SYNC, file->node->devmap_handle,
707 file->node->index, &answer);
708
709 /* Wait for reply from the FS server. */
710 sysarg_t rc;
711 async_wait_for(msg, &rc);
712
713 vfs_release_phone(file->node->fs_handle, fs_phone);
714 fibril_mutex_unlock(&file->lock);
715
716 vfs_file_put(file);
717 ipc_answer_0(rid, rc);
718}
719
720int vfs_close_internal(vfs_file_t *file)
721{
722 /*
723 * Lock the open file structure so that no other thread can manipulate
724 * the same open file at a time.
725 */
726 fibril_mutex_lock(&file->lock);
727
728 if (file->refcnt <= 1) {
729 /* Only close the file on the destination FS server
730 if there are no more file descriptors (except the
731 present one) pointing to this file. */
732
733 int fs_phone = vfs_grab_phone(file->node->fs_handle);
734
735 /* Make a VFS_OUT_CLOSE request at the destination FS server. */
736 aid_t msg;
737 ipc_call_t answer;
738 msg = async_send_2(fs_phone, VFS_OUT_CLOSE,
739 file->node->devmap_handle, file->node->index, &answer);
740
741 /* Wait for reply from the FS server. */
742 sysarg_t rc;
743 async_wait_for(msg, &rc);
744
745 vfs_release_phone(file->node->fs_handle, fs_phone);
746 fibril_mutex_unlock(&file->lock);
747
748 return IPC_GET_ARG1(answer);
749 }
750
751 fibril_mutex_unlock(&file->lock);
752 return EOK;
753}
754
755void vfs_close(ipc_callid_t rid, ipc_call_t *request)
756{
757 int fd = IPC_GET_ARG1(*request);
758
759 /* Lookup the file structure corresponding to the file descriptor. */
760 vfs_file_t *file = vfs_file_get(fd);
761 if (!file) {
762 ipc_answer_0(rid, ENOENT);
763 return;
764 }
765
766 int ret = vfs_close_internal(file);
767 if (ret != EOK)
768 ipc_answer_0(rid, ret);
769
770 vfs_file_put(file);
771 ret = vfs_fd_free(fd);
772 ipc_answer_0(rid, ret);
773}
774
775static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read)
776{
777 vfs_info_t *vi;
778
779 /*
780 * The following code strongly depends on the fact that the files data
781 * structure can be only accessed by a single fibril and all file
782 * operations are serialized (i.e. the reads and writes cannot
783 * interleave and a file cannot be closed while it is being read).
784 *
785 * Additional synchronization needs to be added once the table of
786 * open files supports parallel access!
787 */
788
789 int fd = IPC_GET_ARG1(*request);
790
791 /* Lookup the file structure corresponding to the file descriptor. */
792 vfs_file_t *file = vfs_file_get(fd);
793 if (!file) {
794 ipc_answer_0(rid, ENOENT);
795 return;
796 }
797
798 /*
799 * Lock the open file structure so that no other thread can manipulate
800 * the same open file at a time.
801 */
802 fibril_mutex_lock(&file->lock);
803
804 vi = fs_handle_to_info(file->node->fs_handle);
805 assert(vi);
806
807 /*
808 * Lock the file's node so that no other client can read/write to it at
809 * the same time unless the FS supports concurrent reads/writes and its
810 * write implementation does not modify the file size.
811 */
812 if (read || (vi->concurrent_read_write && vi->write_retains_size))
813 fibril_rwlock_read_lock(&file->node->contents_rwlock);
814 else
815 fibril_rwlock_write_lock(&file->node->contents_rwlock);
816
817 if (file->node->type == VFS_NODE_DIRECTORY) {
818 /*
819 * Make sure that no one is modifying the namespace
820 * while we are in readdir().
821 */
822 assert(read);
823 fibril_rwlock_read_lock(&namespace_rwlock);
824 }
825
826 int fs_phone = vfs_grab_phone(file->node->fs_handle);
827
828 /*
829 * Make a VFS_READ/VFS_WRITE request at the destination FS server
830 * and forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the
831 * destination FS server. The call will be routed as if sent by
832 * ourselves. Note that call arguments are immutable in this case so we
833 * don't have to bother.
834 */
835 sysarg_t rc;
836 ipc_call_t answer;
837 if (read) {
838 rc = async_data_read_forward_3_1(fs_phone, VFS_OUT_READ,
839 file->node->devmap_handle, file->node->index, file->pos,
840 &answer);
841 } else {
842 if (file->append)
843 file->pos = file->node->size;
844
845 rc = async_data_write_forward_3_1(fs_phone, VFS_OUT_WRITE,
846 file->node->devmap_handle, file->node->index, file->pos,
847 &answer);
848 }
849
850 vfs_release_phone(file->node->fs_handle, fs_phone);
851
852 size_t bytes = IPC_GET_ARG1(answer);
853
854 if (file->node->type == VFS_NODE_DIRECTORY)
855 fibril_rwlock_read_unlock(&namespace_rwlock);
856
857 /* Unlock the VFS node. */
858 if (read || (vi->concurrent_read_write && vi->write_retains_size))
859 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
860 else {
861 /* Update the cached version of node's size. */
862 if (rc == EOK)
863 file->node->size = IPC_GET_ARG2(answer);
864 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
865 }
866
867 /* Update the position pointer and unlock the open file. */
868 if (rc == EOK)
869 file->pos += bytes;
870 fibril_mutex_unlock(&file->lock);
871 vfs_file_put(file);
872
873 /*
874 * FS server's reply is the final result of the whole operation we
875 * return to the client.
876 */
877 ipc_answer_1(rid, rc, bytes);
878}
879
880void vfs_read(ipc_callid_t rid, ipc_call_t *request)
881{
882 vfs_rdwr(rid, request, true);
883}
884
885void vfs_write(ipc_callid_t rid, ipc_call_t *request)
886{
887 vfs_rdwr(rid, request, false);
888}
889
890void vfs_seek(ipc_callid_t rid, ipc_call_t *request)
891{
892 int fd = (int) IPC_GET_ARG1(*request);
893 off64_t off = (off64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
894 IPC_GET_ARG3(*request));
895 int whence = (int) IPC_GET_ARG4(*request);
896
897 /* Lookup the file structure corresponding to the file descriptor. */
898 vfs_file_t *file = vfs_file_get(fd);
899 if (!file) {
900 ipc_answer_0(rid, ENOENT);
901 return;
902 }
903
904 fibril_mutex_lock(&file->lock);
905
906 off64_t newoff;
907 switch (whence) {
908 case SEEK_SET:
909 if (off >= 0) {
910 file->pos = (aoff64_t) off;
911 fibril_mutex_unlock(&file->lock);
912 vfs_file_put(file);
913 ipc_answer_1(rid, EOK, off);
914 return;
915 }
916 break;
917 case SEEK_CUR:
918 if ((off >= 0) && (file->pos + off < file->pos)) {
919 fibril_mutex_unlock(&file->lock);
920 vfs_file_put(file);
921 ipc_answer_0(rid, EOVERFLOW);
922 return;
923 }
924
925 if ((off < 0) && (file->pos < (aoff64_t) -off)) {
926 fibril_mutex_unlock(&file->lock);
927 vfs_file_put(file);
928 ipc_answer_0(rid, EOVERFLOW);
929 return;
930 }
931
932 file->pos += off;
933 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
934
935 fibril_mutex_unlock(&file->lock);
936 vfs_file_put(file);
937 ipc_answer_2(rid, EOK, LOWER32(newoff),
938 UPPER32(newoff));
939 return;
940 case SEEK_END:
941 fibril_rwlock_read_lock(&file->node->contents_rwlock);
942 aoff64_t size = file->node->size;
943
944 if ((off >= 0) && (size + off < size)) {
945 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
946 fibril_mutex_unlock(&file->lock);
947 vfs_file_put(file);
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 vfs_file_put(file);
956 ipc_answer_0(rid, EOVERFLOW);
957 return;
958 }
959
960 file->pos = size + off;
961 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
962
963 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
964 fibril_mutex_unlock(&file->lock);
965 vfs_file_put(file);
966 ipc_answer_2(rid, EOK, LOWER32(newoff), UPPER32(newoff));
967 return;
968 }
969
970 fibril_mutex_unlock(&file->lock);
971 vfs_file_put(file);
972 ipc_answer_0(rid, EINVAL);
973}
974
975int vfs_truncate_internal(fs_handle_t fs_handle, devmap_handle_t devmap_handle,
976 fs_index_t index, aoff64_t size)
977{
978 sysarg_t rc;
979 int fs_phone;
980
981 fs_phone = vfs_grab_phone(fs_handle);
982 rc = async_req_4_0(fs_phone, VFS_OUT_TRUNCATE, (sysarg_t) devmap_handle,
983 (sysarg_t) index, LOWER32(size), UPPER32(size));
984 vfs_release_phone(fs_handle, fs_phone);
985 return (int)rc;
986}
987
988void vfs_truncate(ipc_callid_t rid, ipc_call_t *request)
989{
990 int fd = IPC_GET_ARG1(*request);
991 aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
992 IPC_GET_ARG3(*request));
993 int rc;
994
995 vfs_file_t *file = vfs_file_get(fd);
996 if (!file) {
997 ipc_answer_0(rid, ENOENT);
998 return;
999 }
1000 fibril_mutex_lock(&file->lock);
1001
1002 fibril_rwlock_write_lock(&file->node->contents_rwlock);
1003 rc = vfs_truncate_internal(file->node->fs_handle,
1004 file->node->devmap_handle, file->node->index, size);
1005 if (rc == EOK)
1006 file->node->size = size;
1007 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
1008
1009 fibril_mutex_unlock(&file->lock);
1010 vfs_file_put(file);
1011 ipc_answer_0(rid, (sysarg_t)rc);
1012}
1013
1014void vfs_fstat(ipc_callid_t rid, ipc_call_t *request)
1015{
1016 int fd = IPC_GET_ARG1(*request);
1017 sysarg_t rc;
1018
1019 vfs_file_t *file = vfs_file_get(fd);
1020 if (!file) {
1021 ipc_answer_0(rid, ENOENT);
1022 return;
1023 }
1024
1025 ipc_callid_t callid;
1026 if (!async_data_read_receive(&callid, NULL)) {
1027 vfs_file_put(file);
1028 ipc_answer_0(callid, EINVAL);
1029 ipc_answer_0(rid, EINVAL);
1030 return;
1031 }
1032
1033 fibril_mutex_lock(&file->lock);
1034
1035 int fs_phone = vfs_grab_phone(file->node->fs_handle);
1036
1037 aid_t msg;
1038 msg = async_send_3(fs_phone, VFS_OUT_STAT, file->node->devmap_handle,
1039 file->node->index, true, NULL);
1040 ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1041 async_wait_for(msg, &rc);
1042 vfs_release_phone(file->node->fs_handle, fs_phone);
1043
1044 fibril_mutex_unlock(&file->lock);
1045 vfs_file_put(file);
1046 ipc_answer_0(rid, rc);
1047}
1048
1049void vfs_stat(ipc_callid_t rid, ipc_call_t *request)
1050{
1051 char *path;
1052 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1053 if (rc != EOK) {
1054 ipc_answer_0(rid, rc);
1055 return;
1056 }
1057
1058 ipc_callid_t callid;
1059 if (!async_data_read_receive(&callid, NULL)) {
1060 free(path);
1061 ipc_answer_0(callid, EINVAL);
1062 ipc_answer_0(rid, EINVAL);
1063 return;
1064 }
1065
1066 vfs_lookup_res_t lr;
1067 fibril_rwlock_read_lock(&namespace_rwlock);
1068 rc = vfs_lookup_internal(path, L_NONE, &lr, NULL);
1069 free(path);
1070 if (rc != EOK) {
1071 fibril_rwlock_read_unlock(&namespace_rwlock);
1072 ipc_answer_0(callid, rc);
1073 ipc_answer_0(rid, rc);
1074 return;
1075 }
1076 vfs_node_t *node = vfs_node_get(&lr);
1077 if (!node) {
1078 fibril_rwlock_read_unlock(&namespace_rwlock);
1079 ipc_answer_0(callid, ENOMEM);
1080 ipc_answer_0(rid, ENOMEM);
1081 return;
1082 }
1083
1084 fibril_rwlock_read_unlock(&namespace_rwlock);
1085
1086 int fs_phone = vfs_grab_phone(node->fs_handle);
1087 aid_t msg;
1088 msg = async_send_3(fs_phone, VFS_OUT_STAT, node->devmap_handle,
1089 node->index, false, NULL);
1090 ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1091
1092 sysarg_t rv;
1093 async_wait_for(msg, &rv);
1094 vfs_release_phone(node->fs_handle, fs_phone);
1095
1096 ipc_answer_0(rid, rv);
1097
1098 vfs_node_put(node);
1099}
1100
1101void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request)
1102{
1103 int mode = IPC_GET_ARG1(*request);
1104
1105 char *path;
1106 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1107 if (rc != EOK) {
1108 ipc_answer_0(rid, rc);
1109 return;
1110 }
1111
1112 /* Ignore mode for now. */
1113 (void) mode;
1114
1115 fibril_rwlock_write_lock(&namespace_rwlock);
1116 int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE;
1117 rc = vfs_lookup_internal(path, lflag, NULL, NULL);
1118 fibril_rwlock_write_unlock(&namespace_rwlock);
1119 free(path);
1120 ipc_answer_0(rid, rc);
1121}
1122
1123void vfs_unlink(ipc_callid_t rid, ipc_call_t *request)
1124{
1125 int lflag = IPC_GET_ARG1(*request);
1126
1127 char *path;
1128 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1129 if (rc != EOK) {
1130 ipc_answer_0(rid, rc);
1131 return;
1132 }
1133
1134 fibril_rwlock_write_lock(&namespace_rwlock);
1135 lflag &= L_DIRECTORY; /* sanitize lflag */
1136 vfs_lookup_res_t lr;
1137 rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL);
1138 free(path);
1139 if (rc != EOK) {
1140 fibril_rwlock_write_unlock(&namespace_rwlock);
1141 ipc_answer_0(rid, rc);
1142 return;
1143 }
1144
1145 /*
1146 * The name has already been unlinked by vfs_lookup_internal().
1147 * We have to get and put the VFS node to ensure that it is
1148 * VFS_OUT_DESTROY'ed after the last reference to it is dropped.
1149 */
1150 vfs_node_t *node = vfs_node_get(&lr);
1151 fibril_mutex_lock(&nodes_mutex);
1152 node->lnkcnt--;
1153 fibril_mutex_unlock(&nodes_mutex);
1154 fibril_rwlock_write_unlock(&namespace_rwlock);
1155 vfs_node_put(node);
1156 ipc_answer_0(rid, EOK);
1157}
1158
1159void vfs_rename(ipc_callid_t rid, ipc_call_t *request)
1160{
1161 /* Retrieve the old path. */
1162 char *old;
1163 int rc = async_data_write_accept((void **) &old, true, 0, 0, 0, NULL);
1164 if (rc != EOK) {
1165 ipc_answer_0(rid, rc);
1166 return;
1167 }
1168
1169 /* Retrieve the new path. */
1170 char *new;
1171 rc = async_data_write_accept((void **) &new, true, 0, 0, 0, NULL);
1172 if (rc != EOK) {
1173 free(old);
1174 ipc_answer_0(rid, rc);
1175 return;
1176 }
1177
1178 size_t olen;
1179 size_t nlen;
1180 char *oldc = canonify(old, &olen);
1181 char *newc = canonify(new, &nlen);
1182
1183 if ((!oldc) || (!newc)) {
1184 ipc_answer_0(rid, EINVAL);
1185 free(old);
1186 free(new);
1187 return;
1188 }
1189
1190 oldc[olen] = '\0';
1191 newc[nlen] = '\0';
1192
1193 if ((!str_lcmp(newc, oldc, str_length(oldc))) &&
1194 ((newc[str_length(oldc)] == '/') ||
1195 (str_length(oldc) == 1) ||
1196 (str_length(oldc) == str_length(newc)))) {
1197 /*
1198 * oldc is a prefix of newc and either
1199 * - newc continues with a / where oldc ends, or
1200 * - oldc was / itself, or
1201 * - oldc and newc are equal.
1202 */
1203 ipc_answer_0(rid, EINVAL);
1204 free(old);
1205 free(new);
1206 return;
1207 }
1208
1209 vfs_lookup_res_t old_lr;
1210 vfs_lookup_res_t new_lr;
1211 vfs_lookup_res_t new_par_lr;
1212 fibril_rwlock_write_lock(&namespace_rwlock);
1213
1214 /* Lookup the node belonging to the old file name. */
1215 rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL);
1216 if (rc != EOK) {
1217 fibril_rwlock_write_unlock(&namespace_rwlock);
1218 ipc_answer_0(rid, rc);
1219 free(old);
1220 free(new);
1221 return;
1222 }
1223
1224 vfs_node_t *old_node = vfs_node_get(&old_lr);
1225 if (!old_node) {
1226 fibril_rwlock_write_unlock(&namespace_rwlock);
1227 ipc_answer_0(rid, ENOMEM);
1228 free(old);
1229 free(new);
1230 return;
1231 }
1232
1233 /* Determine the path to the parent of the node with the new name. */
1234 char *parentc = str_dup(newc);
1235 if (!parentc) {
1236 fibril_rwlock_write_unlock(&namespace_rwlock);
1237 ipc_answer_0(rid, rc);
1238 free(old);
1239 free(new);
1240 return;
1241 }
1242
1243 char *lastsl = str_rchr(parentc + 1, '/');
1244 if (lastsl)
1245 *lastsl = '\0';
1246 else
1247 parentc[1] = '\0';
1248
1249 /* Lookup parent of the new file name. */
1250 rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL);
1251 free(parentc); /* not needed anymore */
1252 if (rc != EOK) {
1253 fibril_rwlock_write_unlock(&namespace_rwlock);
1254 ipc_answer_0(rid, rc);
1255 free(old);
1256 free(new);
1257 return;
1258 }
1259
1260 /* Check whether linking to the same file system instance. */
1261 if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) ||
1262 (old_node->devmap_handle != new_par_lr.triplet.devmap_handle)) {
1263 fibril_rwlock_write_unlock(&namespace_rwlock);
1264 ipc_answer_0(rid, EXDEV); /* different file systems */
1265 free(old);
1266 free(new);
1267 return;
1268 }
1269
1270 /* Destroy the old link for the new name. */
1271 vfs_node_t *new_node = NULL;
1272 rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL);
1273
1274 switch (rc) {
1275 case ENOENT:
1276 /* simply not in our way */
1277 break;
1278 case EOK:
1279 new_node = vfs_node_get(&new_lr);
1280 if (!new_node) {
1281 fibril_rwlock_write_unlock(&namespace_rwlock);
1282 ipc_answer_0(rid, ENOMEM);
1283 free(old);
1284 free(new);
1285 return;
1286 }
1287 fibril_mutex_lock(&nodes_mutex);
1288 new_node->lnkcnt--;
1289 fibril_mutex_unlock(&nodes_mutex);
1290 break;
1291 default:
1292 fibril_rwlock_write_unlock(&namespace_rwlock);
1293 ipc_answer_0(rid, ENOTEMPTY);
1294 free(old);
1295 free(new);
1296 return;
1297 }
1298
1299 /* Create the new link for the new name. */
1300 rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index);
1301 if (rc != EOK) {
1302 fibril_rwlock_write_unlock(&namespace_rwlock);
1303 if (new_node)
1304 vfs_node_put(new_node);
1305 ipc_answer_0(rid, rc);
1306 free(old);
1307 free(new);
1308 return;
1309 }
1310
1311 fibril_mutex_lock(&nodes_mutex);
1312 old_node->lnkcnt++;
1313 fibril_mutex_unlock(&nodes_mutex);
1314
1315 /* Destroy the link for the old name. */
1316 rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL);
1317 if (rc != EOK) {
1318 fibril_rwlock_write_unlock(&namespace_rwlock);
1319 vfs_node_put(old_node);
1320 if (new_node)
1321 vfs_node_put(new_node);
1322 ipc_answer_0(rid, rc);
1323 free(old);
1324 free(new);
1325 return;
1326 }
1327
1328 fibril_mutex_lock(&nodes_mutex);
1329 old_node->lnkcnt--;
1330 fibril_mutex_unlock(&nodes_mutex);
1331 fibril_rwlock_write_unlock(&namespace_rwlock);
1332 vfs_node_put(old_node);
1333
1334 if (new_node)
1335 vfs_node_put(new_node);
1336
1337 free(old);
1338 free(new);
1339 ipc_answer_0(rid, EOK);
1340}
1341
1342void vfs_dup(ipc_callid_t rid, ipc_call_t *request)
1343{
1344 int oldfd = IPC_GET_ARG1(*request);
1345 int newfd = IPC_GET_ARG2(*request);
1346
1347 /* If the file descriptors are the same, do nothing. */
1348 if (oldfd == newfd) {
1349 ipc_answer_1(rid, EOK, newfd);
1350 return;
1351 }
1352
1353 /* Lookup the file structure corresponding to oldfd. */
1354 vfs_file_t *oldfile = vfs_file_get(oldfd);
1355 if (!oldfile) {
1356 ipc_answer_0(rid, EBADF);
1357 return;
1358 }
1359
1360 /*
1361 * Lock the open file structure so that no other thread can manipulate
1362 * the same open file at a time.
1363 */
1364 fibril_mutex_lock(&oldfile->lock);
1365
1366 /* Lookup an open file structure possibly corresponding to newfd. */
1367 vfs_file_t *newfile = vfs_file_get(newfd);
1368 if (newfile) {
1369 /* Close the originally opened file. */
1370 int ret = vfs_close_internal(newfile);
1371 if (ret != EOK) {
1372 fibril_mutex_unlock(&oldfile->lock);
1373 vfs_file_put(oldfile);
1374 vfs_file_put(newfile);
1375 ipc_answer_0(rid, ret);
1376 return;
1377 }
1378
1379 ret = vfs_fd_free(newfd);
1380 if (ret != EOK) {
1381 fibril_mutex_unlock(&oldfile->lock);
1382 vfs_file_put(oldfile);
1383 vfs_file_put(newfile);
1384 ipc_answer_0(rid, ret);
1385 return;
1386 }
1387 vfs_file_put(newfile);
1388 }
1389
1390 /* Assign the old file to newfd. */
1391 int ret = vfs_fd_assign(oldfile, newfd);
1392 fibril_mutex_unlock(&oldfile->lock);
1393 vfs_file_put(oldfile);
1394
1395 if (ret != EOK)
1396 ipc_answer_0(rid, ret);
1397 else
1398 ipc_answer_1(rid, EOK, newfd);
1399}
1400
1401/**
1402 * @}
1403 */
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