source: mainline/uspace/srv/vfs/vfs_ops.c@ bc41f3a3

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since bc41f3a3 was 6afc9d7, checked in by Jiri Svoboda <jiri@…>, 10 years ago

UNIX-like I/O functions should use errno to return error code for many reasons.
  • Property mode set to 100644
File size: 36.1 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 <macros.h>
40#include <stdint.h>
41#include <async.h>
42#include <errno.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <str.h>
46#include <stdbool.h>
47#include <fibril_synch.h>
48#include <adt/list.h>
49#include <unistd.h>
50#include <ctype.h>
51#include <fcntl.h>
52#include <assert.h>
53#include <vfs/canonify.h>
54#include <vfs/vfs_mtab.h>
55
56FIBRIL_MUTEX_INITIALIZE(mtab_list_lock);
57LIST_INITIALIZE(mtab_list);
58static size_t mtab_size = 0;
59
60/* Forward declarations of static functions. */
61static int vfs_truncate_internal(fs_handle_t, service_id_t, fs_index_t,
62 aoff64_t);
63
64/**
65 * This rwlock prevents the race between a triplet-to-VFS-node resolution and a
66 * concurrent VFS operation which modifies the file system namespace.
67 */
68FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock);
69
70vfs_pair_t rootfs = {
71 .fs_handle = 0,
72 .service_id = 0
73};
74
75static int vfs_mount_internal(ipc_callid_t rid, service_id_t service_id,
76 fs_handle_t fs_handle, char *mp, char *opts)
77{
78 vfs_lookup_res_t mp_res;
79 vfs_lookup_res_t mr_res;
80 vfs_node_t *mp_node = NULL;
81 vfs_node_t *mr_node;
82 fs_index_t rindex;
83 aoff64_t rsize;
84 unsigned rlnkcnt;
85 async_exch_t *exch;
86 sysarg_t rc;
87 aid_t msg;
88 ipc_call_t answer;
89
90 /* Resolve the path to the mountpoint. */
91 fibril_rwlock_write_lock(&namespace_rwlock);
92 if (rootfs.fs_handle) {
93 /* We already have the root FS. */
94 if (str_cmp(mp, "/") == 0) {
95 /* Trying to mount root FS over root FS */
96 fibril_rwlock_write_unlock(&namespace_rwlock);
97 async_answer_0(rid, EBUSY);
98 return EBUSY;
99 }
100
101 rc = vfs_lookup_internal(mp, L_MP, &mp_res, NULL);
102 if (rc != EOK) {
103 /* The lookup failed for some reason. */
104 fibril_rwlock_write_unlock(&namespace_rwlock);
105 async_answer_0(rid, rc);
106 return rc;
107 }
108
109 mp_node = vfs_node_get(&mp_res);
110 if (!mp_node) {
111 fibril_rwlock_write_unlock(&namespace_rwlock);
112 async_answer_0(rid, ENOMEM);
113 return ENOMEM;
114 }
115
116 /*
117 * Now we hold a reference to mp_node.
118 * It will be dropped upon the corresponding VFS_IN_UNMOUNT.
119 * This prevents the mount point from being deleted.
120 */
121 } else {
122 /* We still don't have the root file system mounted. */
123 if (str_cmp(mp, "/") == 0) {
124 /*
125 * For this simple, but important case,
126 * we are almost done.
127 */
128
129 /* Tell the mountee that it is being mounted. */
130 exch = vfs_exchange_grab(fs_handle);
131 msg = async_send_1(exch, VFS_OUT_MOUNTED,
132 (sysarg_t) service_id, &answer);
133 /* Send the mount options */
134 rc = async_data_write_start(exch, (void *)opts,
135 str_size(opts));
136 vfs_exchange_release(exch);
137
138 if (rc != EOK) {
139 async_forget(msg);
140 fibril_rwlock_write_unlock(&namespace_rwlock);
141 async_answer_0(rid, rc);
142 return rc;
143 }
144 async_wait_for(msg, &rc);
145
146 if (rc != EOK) {
147 fibril_rwlock_write_unlock(&namespace_rwlock);
148 async_answer_0(rid, rc);
149 return rc;
150 }
151
152 rindex = (fs_index_t) IPC_GET_ARG1(answer);
153 rsize = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG2(answer),
154 IPC_GET_ARG3(answer));
155 rlnkcnt = (unsigned) IPC_GET_ARG4(answer);
156
157 mr_res.triplet.fs_handle = fs_handle;
158 mr_res.triplet.service_id = service_id;
159 mr_res.triplet.index = rindex;
160 mr_res.size = rsize;
161 mr_res.lnkcnt = rlnkcnt;
162 mr_res.type = VFS_NODE_DIRECTORY;
163
164 rootfs.fs_handle = fs_handle;
165 rootfs.service_id = service_id;
166
167 /* Add reference to the mounted root. */
168 mr_node = vfs_node_get(&mr_res);
169 assert(mr_node);
170
171 fibril_rwlock_write_unlock(&namespace_rwlock);
172 async_answer_0(rid, rc);
173 return rc;
174 } else {
175 /*
176 * We can't resolve this without the root filesystem
177 * being mounted first.
178 */
179 fibril_rwlock_write_unlock(&namespace_rwlock);
180 async_answer_0(rid, ENOENT);
181 return ENOENT;
182 }
183 }
184
185 /*
186 * At this point, we have all necessary pieces: file system handle
187 * and service ID, and we know the mount point VFS node.
188 */
189
190 async_exch_t *mountee_exch = vfs_exchange_grab(fs_handle);
191 assert(mountee_exch);
192
193 exch = vfs_exchange_grab(mp_res.triplet.fs_handle);
194 msg = async_send_4(exch, VFS_OUT_MOUNT,
195 (sysarg_t) mp_res.triplet.service_id,
196 (sysarg_t) mp_res.triplet.index,
197 (sysarg_t) fs_handle,
198 (sysarg_t) service_id, &answer);
199
200 /* Send connection */
201 rc = async_exchange_clone(exch, mountee_exch);
202 vfs_exchange_release(mountee_exch);
203
204 if (rc != EOK) {
205 vfs_exchange_release(exch);
206 async_forget(msg);
207
208 /* Mount failed, drop reference to mp_node. */
209 if (mp_node)
210 vfs_node_put(mp_node);
211
212 async_answer_0(rid, rc);
213 fibril_rwlock_write_unlock(&namespace_rwlock);
214 return rc;
215 }
216
217 /* send the mount options */
218 rc = async_data_write_start(exch, (void *) opts, str_size(opts));
219 if (rc != EOK) {
220 vfs_exchange_release(exch);
221 async_forget(msg);
222
223 /* Mount failed, drop reference to mp_node. */
224 if (mp_node)
225 vfs_node_put(mp_node);
226
227 fibril_rwlock_write_unlock(&namespace_rwlock);
228 async_answer_0(rid, rc);
229 return rc;
230 }
231
232 /*
233 * Wait for the answer before releasing the exchange to avoid deadlock
234 * in case the answer depends on further calls to the same file system.
235 * Think of a case when mounting a FS on a file_bd backed by a file on
236 * the same FS.
237 */
238 async_wait_for(msg, &rc);
239 vfs_exchange_release(exch);
240
241 if (rc == EOK) {
242 rindex = (fs_index_t) IPC_GET_ARG1(answer);
243 rsize = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG2(answer),
244 IPC_GET_ARG3(answer));
245 rlnkcnt = (unsigned) IPC_GET_ARG4(answer);
246
247 mr_res.triplet.fs_handle = fs_handle;
248 mr_res.triplet.service_id = service_id;
249 mr_res.triplet.index = rindex;
250 mr_res.size = rsize;
251 mr_res.lnkcnt = rlnkcnt;
252 mr_res.type = VFS_NODE_DIRECTORY;
253
254 /* Add reference to the mounted root. */
255 mr_node = vfs_node_get(&mr_res);
256 assert(mr_node);
257 } else {
258 /* Mount failed, drop reference to mp_node. */
259 if (mp_node)
260 vfs_node_put(mp_node);
261 }
262
263 async_answer_0(rid, rc);
264 fibril_rwlock_write_unlock(&namespace_rwlock);
265 return rc;
266}
267
268void vfs_mount_srv(ipc_callid_t rid, ipc_call_t *request)
269{
270 service_id_t service_id;
271
272 /*
273 * We expect the library to do the device-name to device-handle
274 * translation for us, thus the device handle will arrive as ARG1
275 * in the request.
276 */
277 service_id = (service_id_t) IPC_GET_ARG1(*request);
278
279 /*
280 * Mount flags are passed as ARG2.
281 */
282 unsigned int flags = (unsigned int) IPC_GET_ARG2(*request);
283
284 /*
285 * Instance number is passed as ARG3.
286 */
287 unsigned int instance = IPC_GET_ARG3(*request);
288
289 /* We want the client to send us the mount point. */
290 char *mp;
291 int rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
292 0, NULL);
293 if (rc != EOK) {
294 async_answer_0(rid, rc);
295 return;
296 }
297
298 /* Now we expect to receive the mount options. */
299 char *opts;
300 rc = async_data_write_accept((void **) &opts, true, 0, MAX_MNTOPTS_LEN,
301 0, NULL);
302 if (rc != EOK) {
303 free(mp);
304 async_answer_0(rid, rc);
305 return;
306 }
307
308 /*
309 * Now, we expect the client to send us data with the name of the file
310 * system.
311 */
312 char *fs_name;
313 rc = async_data_write_accept((void **) &fs_name, true, 0,
314 FS_NAME_MAXLEN, 0, NULL);
315 if (rc != EOK) {
316 free(mp);
317 free(opts);
318 async_answer_0(rid, rc);
319 return;
320 }
321
322 /*
323 * Wait for VFS_IN_PING so that we can return an error if we don't know
324 * fs_name.
325 */
326 ipc_call_t data;
327 ipc_callid_t callid = async_get_call(&data);
328 if (IPC_GET_IMETHOD(data) != VFS_IN_PING) {
329 async_answer_0(callid, ENOTSUP);
330 async_answer_0(rid, ENOTSUP);
331 free(mp);
332 free(opts);
333 free(fs_name);
334 return;
335 }
336
337 /*
338 * Check if we know a file system with the same name as is in fs_name.
339 * This will also give us its file system handle.
340 */
341 fibril_mutex_lock(&fs_list_lock);
342 fs_handle_t fs_handle;
343recheck:
344 fs_handle = fs_name_to_handle(instance, fs_name, false);
345 if (!fs_handle) {
346 if (flags & IPC_FLAG_BLOCKING) {
347 fibril_condvar_wait(&fs_list_cv, &fs_list_lock);
348 goto recheck;
349 }
350
351 fibril_mutex_unlock(&fs_list_lock);
352 async_answer_0(callid, ENOENT);
353 async_answer_0(rid, ENOENT);
354 free(mp);
355 free(fs_name);
356 free(opts);
357 return;
358 }
359 fibril_mutex_unlock(&fs_list_lock);
360
361 /* Add the filesystem info to the list of mounted filesystems */
362 mtab_ent_t *mtab_ent = malloc(sizeof(mtab_ent_t));
363 if (!mtab_ent) {
364 async_answer_0(callid, ENOMEM);
365 async_answer_0(rid, ENOMEM);
366 free(mp);
367 free(fs_name);
368 free(opts);
369 return;
370 }
371
372 /* Do the mount */
373 rc = vfs_mount_internal(rid, service_id, fs_handle, mp, opts);
374 if (rc != EOK) {
375 async_answer_0(callid, ENOTSUP);
376 async_answer_0(rid, ENOTSUP);
377 free(mtab_ent);
378 free(mp);
379 free(opts);
380 free(fs_name);
381 return;
382 }
383
384 /* Add the filesystem info to the list of mounted filesystems */
385
386 str_cpy(mtab_ent->mp, MAX_PATH_LEN, mp);
387 str_cpy(mtab_ent->fs_name, FS_NAME_MAXLEN, fs_name);
388 str_cpy(mtab_ent->opts, MAX_MNTOPTS_LEN, opts);
389 mtab_ent->instance = instance;
390 mtab_ent->service_id = service_id;
391
392 link_initialize(&mtab_ent->link);
393
394 fibril_mutex_lock(&mtab_list_lock);
395 list_append(&mtab_ent->link, &mtab_list);
396 mtab_size++;
397 fibril_mutex_unlock(&mtab_list_lock);
398
399 free(mp);
400 free(fs_name);
401 free(opts);
402
403 /* Acknowledge that we know fs_name. */
404 async_answer_0(callid, EOK);
405}
406
407void vfs_unmount_srv(ipc_callid_t rid, ipc_call_t *request)
408{
409 int rc;
410 char *mp;
411 vfs_lookup_res_t mp_res;
412 vfs_lookup_res_t mr_res;
413 vfs_node_t *mr_node;
414 async_exch_t *exch;
415
416 /*
417 * Receive the mount point path.
418 */
419 rc = async_data_write_accept((void **) &mp, true, 0, MAX_PATH_LEN,
420 0, NULL);
421 if (rc != EOK)
422 async_answer_0(rid, rc);
423
424 /*
425 * Taking the namespace lock will do two things for us. First, it will
426 * prevent races with other lookup operations. Second, it will stop new
427 * references to already existing VFS nodes and creation of new VFS
428 * nodes. This is because new references are added as a result of some
429 * lookup operation or at least of some operation which is protected by
430 * the namespace lock.
431 */
432 fibril_rwlock_write_lock(&namespace_rwlock);
433
434 /*
435 * Lookup the mounted root and instantiate it.
436 */
437 rc = vfs_lookup_internal(mp, L_ROOT, &mr_res, NULL);
438 if (rc != EOK) {
439 fibril_rwlock_write_unlock(&namespace_rwlock);
440 free(mp);
441 async_answer_0(rid, rc);
442 return;
443 }
444 mr_node = vfs_node_get(&mr_res);
445 if (!mr_node) {
446 fibril_rwlock_write_unlock(&namespace_rwlock);
447 free(mp);
448 async_answer_0(rid, ENOMEM);
449 return;
450 }
451
452 /*
453 * Count the total number of references for the mounted file system. We
454 * are expecting at least two. One which we got above and one which we
455 * got when the file system was mounted. If we find more, it means that
456 * the file system cannot be gracefully unmounted at the moment because
457 * someone is working with it.
458 */
459 if (vfs_nodes_refcount_sum_get(mr_node->fs_handle,
460 mr_node->service_id) != 2) {
461 fibril_rwlock_write_unlock(&namespace_rwlock);
462 vfs_node_put(mr_node);
463 free(mp);
464 async_answer_0(rid, EBUSY);
465 return;
466 }
467
468 if (str_cmp(mp, "/") == 0) {
469
470 /*
471 * Unmounting the root file system.
472 *
473 * In this case, there is no mount point node and we send
474 * VFS_OUT_UNMOUNTED directly to the mounted file system.
475 */
476
477 exch = vfs_exchange_grab(mr_node->fs_handle);
478 rc = async_req_1_0(exch, VFS_OUT_UNMOUNTED,
479 mr_node->service_id);
480 vfs_exchange_release(exch);
481
482 if (rc != EOK) {
483 fibril_rwlock_write_unlock(&namespace_rwlock);
484 free(mp);
485 vfs_node_put(mr_node);
486 async_answer_0(rid, rc);
487 return;
488 }
489
490 rootfs.fs_handle = 0;
491 rootfs.service_id = 0;
492 } else {
493
494 /*
495 * Unmounting a non-root file system.
496 *
497 * We have a regular mount point node representing the parent
498 * file system, so we delegate the operation to it.
499 */
500
501 rc = vfs_lookup_internal(mp, L_MP, &mp_res, NULL);
502 if (rc != EOK) {
503 fibril_rwlock_write_unlock(&namespace_rwlock);
504 free(mp);
505 vfs_node_put(mr_node);
506 async_answer_0(rid, rc);
507 return;
508 }
509
510 vfs_node_t *mp_node = vfs_node_get(&mp_res);
511 if (!mp_node) {
512 fibril_rwlock_write_unlock(&namespace_rwlock);
513 free(mp);
514 vfs_node_put(mr_node);
515 async_answer_0(rid, ENOMEM);
516 return;
517 }
518
519 exch = vfs_exchange_grab(mp_node->fs_handle);
520 rc = async_req_2_0(exch, VFS_OUT_UNMOUNT,
521 mp_node->service_id, mp_node->index);
522 vfs_exchange_release(exch);
523
524 if (rc != EOK) {
525 fibril_rwlock_write_unlock(&namespace_rwlock);
526 free(mp);
527 vfs_node_put(mp_node);
528 vfs_node_put(mr_node);
529 async_answer_0(rid, rc);
530 return;
531 }
532
533 /* Drop the reference we got above. */
534 vfs_node_put(mp_node);
535 /* Drop the reference from when the file system was mounted. */
536 vfs_node_put(mp_node);
537 }
538
539 /*
540 * All went well, the mounted file system was successfully unmounted.
541 * The only thing left is to forget the unmounted root VFS node.
542 */
543 vfs_node_forget(mr_node);
544 fibril_rwlock_write_unlock(&namespace_rwlock);
545
546 fibril_mutex_lock(&mtab_list_lock);
547
548 int found = 0;
549
550 list_foreach(mtab_list, link, mtab_ent_t, mtab_ent) {
551 if (str_cmp(mtab_ent->mp, mp) == 0) {
552 list_remove(&mtab_ent->link);
553 mtab_size--;
554 free(mtab_ent);
555 found = 1;
556 break;
557 }
558 }
559 assert(found);
560 fibril_mutex_unlock(&mtab_list_lock);
561
562 free(mp);
563
564 async_answer_0(rid, EOK);
565}
566
567void vfs_open(ipc_callid_t rid, ipc_call_t *request)
568{
569 /*
570 * The POSIX interface is open(path, oflag, mode).
571 * We can receive oflags and mode along with the VFS_IN_OPEN call;
572 * the path will need to arrive in another call.
573 *
574 * We also receive one private, non-POSIX set of flags called lflag
575 * used to pass information to vfs_lookup_internal().
576 */
577 int lflag = IPC_GET_ARG1(*request);
578 int oflag = IPC_GET_ARG2(*request);
579 int mode = IPC_GET_ARG3(*request);
580
581 /* Ignore mode for now. */
582 (void) mode;
583
584 /*
585 * Make sure that we are called with exactly one of L_FILE and
586 * L_DIRECTORY. Make sure that the user does not pass L_OPEN,
587 * L_ROOT or L_MP.
588 */
589 if (((lflag & (L_FILE | L_DIRECTORY)) == 0) ||
590 ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) ||
591 (lflag & (L_OPEN | L_ROOT | L_MP))) {
592 async_answer_0(rid, EINVAL);
593 return;
594 }
595
596 if (oflag & O_CREAT)
597 lflag |= L_CREATE;
598 if (oflag & O_EXCL)
599 lflag |= L_EXCLUSIVE;
600
601 char *path;
602 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
603 if (rc != EOK) {
604 async_answer_0(rid, rc);
605 return;
606 }
607
608 /*
609 * Avoid the race condition in which the file can be deleted before we
610 * find/create-and-lock the VFS node corresponding to the looked-up
611 * triplet.
612 */
613 if (lflag & L_CREATE)
614 fibril_rwlock_write_lock(&namespace_rwlock);
615 else
616 fibril_rwlock_read_lock(&namespace_rwlock);
617
618 /* The path is now populated and we can call vfs_lookup_internal(). */
619 vfs_lookup_res_t lr;
620 rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL);
621 if (rc != EOK) {
622 if (lflag & L_CREATE)
623 fibril_rwlock_write_unlock(&namespace_rwlock);
624 else
625 fibril_rwlock_read_unlock(&namespace_rwlock);
626 async_answer_0(rid, rc);
627 free(path);
628 return;
629 }
630
631 /* Path is no longer needed. */
632 free(path);
633
634 vfs_node_t *node = vfs_node_get(&lr);
635 if (lflag & L_CREATE)
636 fibril_rwlock_write_unlock(&namespace_rwlock);
637 else
638 fibril_rwlock_read_unlock(&namespace_rwlock);
639
640 /* Truncate the file if requested and if necessary. */
641 if (oflag & O_TRUNC) {
642 fibril_rwlock_write_lock(&node->contents_rwlock);
643 if (node->size) {
644 rc = vfs_truncate_internal(node->fs_handle,
645 node->service_id, node->index, 0);
646 if (rc) {
647 fibril_rwlock_write_unlock(&node->contents_rwlock);
648 vfs_node_put(node);
649 async_answer_0(rid, rc);
650 return;
651 }
652 node->size = 0;
653 }
654 fibril_rwlock_write_unlock(&node->contents_rwlock);
655 }
656
657 /*
658 * Get ourselves a file descriptor and the corresponding vfs_file_t
659 * structure.
660 */
661 int fd = vfs_fd_alloc((oflag & O_DESC) != 0);
662 if (fd < 0) {
663 vfs_node_put(node);
664 async_answer_0(rid, fd);
665 return;
666 }
667 vfs_file_t *file = vfs_file_get(fd);
668 assert(file);
669 file->node = node;
670 if (oflag & O_APPEND)
671 file->append = true;
672
673 /*
674 * The following increase in reference count is for the fact that the
675 * file is being opened and that a file structure is pointing to it.
676 * It is necessary so that the file will not disappear when
677 * vfs_node_put() is called. The reference will be dropped by the
678 * respective VFS_IN_CLOSE.
679 */
680 vfs_node_addref(node);
681 vfs_node_put(node);
682 vfs_file_put(file);
683
684 /* Success! Return the new file descriptor to the client. */
685 async_answer_1(rid, EOK, fd);
686}
687
688void vfs_sync(ipc_callid_t rid, ipc_call_t *request)
689{
690 int fd = IPC_GET_ARG1(*request);
691
692 /* Lookup the file structure corresponding to the file descriptor. */
693 vfs_file_t *file = vfs_file_get(fd);
694 if (!file) {
695 async_answer_0(rid, ENOENT);
696 return;
697 }
698
699 /*
700 * Lock the open file structure so that no other thread can manipulate
701 * the same open file at a time.
702 */
703 fibril_mutex_lock(&file->lock);
704 async_exch_t *fs_exch = vfs_exchange_grab(file->node->fs_handle);
705
706 /* Make a VFS_OUT_SYMC request at the destination FS server. */
707 aid_t msg;
708 ipc_call_t answer;
709 msg = async_send_2(fs_exch, VFS_OUT_SYNC, file->node->service_id,
710 file->node->index, &answer);
711
712 vfs_exchange_release(fs_exch);
713
714 /* Wait for reply from the FS server. */
715 sysarg_t rc;
716 async_wait_for(msg, &rc);
717
718 fibril_mutex_unlock(&file->lock);
719
720 vfs_file_put(file);
721 async_answer_0(rid, rc);
722}
723
724void vfs_close(ipc_callid_t rid, ipc_call_t *request)
725{
726 int fd = IPC_GET_ARG1(*request);
727 int ret = vfs_fd_free(fd);
728 async_answer_0(rid, ret);
729}
730
731static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read)
732{
733 /*
734 * The following code strongly depends on the fact that the files data
735 * structure can be only accessed by a single fibril and all file
736 * operations are serialized (i.e. the reads and writes cannot
737 * interleave and a file cannot be closed while it is being read).
738 *
739 * Additional synchronization needs to be added once the table of
740 * open files supports parallel access!
741 */
742
743 int fd = IPC_GET_ARG1(*request);
744
745 /* Lookup the file structure corresponding to the file descriptor. */
746 vfs_file_t *file = vfs_file_get(fd);
747 if (!file) {
748 async_answer_0(rid, ENOENT);
749 return;
750 }
751
752 /*
753 * Lock the open file structure so that no other thread can manipulate
754 * the same open file at a time.
755 */
756 fibril_mutex_lock(&file->lock);
757
758 vfs_info_t *fs_info = fs_handle_to_info(file->node->fs_handle);
759 assert(fs_info);
760
761 /*
762 * Lock the file's node so that no other client can read/write to it at
763 * the same time unless the FS supports concurrent reads/writes and its
764 * write implementation does not modify the file size.
765 */
766 if ((read) ||
767 ((fs_info->concurrent_read_write) && (fs_info->write_retains_size)))
768 fibril_rwlock_read_lock(&file->node->contents_rwlock);
769 else
770 fibril_rwlock_write_lock(&file->node->contents_rwlock);
771
772 if (file->node->type == VFS_NODE_DIRECTORY) {
773 /*
774 * Make sure that no one is modifying the namespace
775 * while we are in readdir().
776 */
777 assert(read);
778 fibril_rwlock_read_lock(&namespace_rwlock);
779 }
780
781 async_exch_t *fs_exch = vfs_exchange_grab(file->node->fs_handle);
782
783 /*
784 * Make a VFS_READ/VFS_WRITE request at the destination FS server
785 * and forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the
786 * destination FS server. The call will be routed as if sent by
787 * ourselves. Note that call arguments are immutable in this case so we
788 * don't have to bother.
789 */
790 sysarg_t rc;
791 ipc_call_t answer;
792 if (read) {
793 rc = async_data_read_forward_4_1(fs_exch, VFS_OUT_READ,
794 file->node->service_id, file->node->index,
795 LOWER32(file->pos), UPPER32(file->pos), &answer);
796 } else {
797 if (file->append)
798 file->pos = file->node->size;
799
800 rc = async_data_write_forward_4_1(fs_exch, VFS_OUT_WRITE,
801 file->node->service_id, file->node->index,
802 LOWER32(file->pos), UPPER32(file->pos), &answer);
803 }
804
805 vfs_exchange_release(fs_exch);
806
807 size_t bytes = IPC_GET_ARG1(answer);
808
809 if (file->node->type == VFS_NODE_DIRECTORY)
810 fibril_rwlock_read_unlock(&namespace_rwlock);
811
812 /* Unlock the VFS node. */
813 if ((read) ||
814 ((fs_info->concurrent_read_write) && (fs_info->write_retains_size)))
815 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
816 else {
817 /* Update the cached version of node's size. */
818 if (rc == EOK)
819 file->node->size = MERGE_LOUP32(IPC_GET_ARG2(answer),
820 IPC_GET_ARG3(answer));
821 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
822 }
823
824 /* Update the position pointer and unlock the open file. */
825 if (rc == EOK)
826 file->pos += bytes;
827 fibril_mutex_unlock(&file->lock);
828 vfs_file_put(file);
829
830 /*
831 * FS server's reply is the final result of the whole operation we
832 * return to the client.
833 */
834 async_answer_1(rid, rc, bytes);
835}
836
837void vfs_read(ipc_callid_t rid, ipc_call_t *request)
838{
839 vfs_rdwr(rid, request, true);
840}
841
842void vfs_write(ipc_callid_t rid, ipc_call_t *request)
843{
844 vfs_rdwr(rid, request, false);
845}
846
847void vfs_seek(ipc_callid_t rid, ipc_call_t *request)
848{
849 int fd = (int) IPC_GET_ARG1(*request);
850 off64_t off = (off64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
851 IPC_GET_ARG3(*request));
852 int whence = (int) IPC_GET_ARG4(*request);
853
854 /* Lookup the file structure corresponding to the file descriptor. */
855 vfs_file_t *file = vfs_file_get(fd);
856 if (!file) {
857 async_answer_0(rid, ENOENT);
858 return;
859 }
860
861 fibril_mutex_lock(&file->lock);
862
863 off64_t newoff;
864 switch (whence) {
865 case SEEK_SET:
866 if (off >= 0) {
867 file->pos = (aoff64_t) off;
868 fibril_mutex_unlock(&file->lock);
869 vfs_file_put(file);
870 async_answer_1(rid, EOK, off);
871 return;
872 }
873 break;
874 case SEEK_CUR:
875 if ((off >= 0) && (file->pos + off < file->pos)) {
876 fibril_mutex_unlock(&file->lock);
877 vfs_file_put(file);
878 async_answer_0(rid, EOVERFLOW);
879 return;
880 }
881
882 if ((off < 0) && (file->pos < (aoff64_t) -off)) {
883 fibril_mutex_unlock(&file->lock);
884 vfs_file_put(file);
885 async_answer_0(rid, EOVERFLOW);
886 return;
887 }
888
889 file->pos += off;
890 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
891
892 fibril_mutex_unlock(&file->lock);
893 vfs_file_put(file);
894 async_answer_2(rid, EOK, LOWER32(newoff),
895 UPPER32(newoff));
896 return;
897 case SEEK_END:
898 fibril_rwlock_read_lock(&file->node->contents_rwlock);
899 aoff64_t size = file->node->size;
900
901 if ((off >= 0) && (size + off < size)) {
902 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
903 fibril_mutex_unlock(&file->lock);
904 vfs_file_put(file);
905 async_answer_0(rid, EOVERFLOW);
906 return;
907 }
908
909 if ((off < 0) && (size < (aoff64_t) -off)) {
910 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
911 fibril_mutex_unlock(&file->lock);
912 vfs_file_put(file);
913 async_answer_0(rid, EOVERFLOW);
914 return;
915 }
916
917 file->pos = size + off;
918 newoff = (file->pos > OFF64_MAX) ? OFF64_MAX : file->pos;
919
920 fibril_rwlock_read_unlock(&file->node->contents_rwlock);
921 fibril_mutex_unlock(&file->lock);
922 vfs_file_put(file);
923 async_answer_2(rid, EOK, LOWER32(newoff), UPPER32(newoff));
924 return;
925 }
926
927 fibril_mutex_unlock(&file->lock);
928 vfs_file_put(file);
929 async_answer_0(rid, EINVAL);
930}
931
932int vfs_truncate_internal(fs_handle_t fs_handle, service_id_t service_id,
933 fs_index_t index, aoff64_t size)
934{
935 async_exch_t *exch = vfs_exchange_grab(fs_handle);
936 sysarg_t rc = async_req_4_0(exch, VFS_OUT_TRUNCATE,
937 (sysarg_t) service_id, (sysarg_t) index, LOWER32(size),
938 UPPER32(size));
939 vfs_exchange_release(exch);
940
941 return (int) rc;
942}
943
944void vfs_truncate(ipc_callid_t rid, ipc_call_t *request)
945{
946 int fd = IPC_GET_ARG1(*request);
947 aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG2(*request),
948 IPC_GET_ARG3(*request));
949 int rc;
950
951 vfs_file_t *file = vfs_file_get(fd);
952 if (!file) {
953 async_answer_0(rid, ENOENT);
954 return;
955 }
956 fibril_mutex_lock(&file->lock);
957
958 fibril_rwlock_write_lock(&file->node->contents_rwlock);
959 rc = vfs_truncate_internal(file->node->fs_handle,
960 file->node->service_id, file->node->index, size);
961 if (rc == EOK)
962 file->node->size = size;
963 fibril_rwlock_write_unlock(&file->node->contents_rwlock);
964
965 fibril_mutex_unlock(&file->lock);
966 vfs_file_put(file);
967 async_answer_0(rid, (sysarg_t)rc);
968}
969
970void vfs_fstat(ipc_callid_t rid, ipc_call_t *request)
971{
972 int fd = IPC_GET_ARG1(*request);
973 sysarg_t rc;
974
975 vfs_file_t *file = vfs_file_get(fd);
976 if (!file) {
977 async_answer_0(rid, ENOENT);
978 return;
979 }
980
981 ipc_callid_t callid;
982 if (!async_data_read_receive(&callid, NULL)) {
983 vfs_file_put(file);
984 async_answer_0(callid, EINVAL);
985 async_answer_0(rid, EINVAL);
986 return;
987 }
988
989 fibril_mutex_lock(&file->lock);
990
991 async_exch_t *exch = vfs_exchange_grab(file->node->fs_handle);
992
993 aid_t msg;
994 msg = async_send_3(exch, VFS_OUT_STAT, file->node->service_id,
995 file->node->index, true, NULL);
996 async_forward_fast(callid, exch, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
997
998 vfs_exchange_release(exch);
999
1000 async_wait_for(msg, &rc);
1001
1002 fibril_mutex_unlock(&file->lock);
1003 vfs_file_put(file);
1004 async_answer_0(rid, rc);
1005}
1006
1007void vfs_stat(ipc_callid_t rid, ipc_call_t *request)
1008{
1009 char *path;
1010 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1011 if (rc != EOK) {
1012 async_answer_0(rid, rc);
1013 return;
1014 }
1015
1016 ipc_callid_t callid;
1017 if (!async_data_read_receive(&callid, NULL)) {
1018 free(path);
1019 async_answer_0(callid, EINVAL);
1020 async_answer_0(rid, EINVAL);
1021 return;
1022 }
1023
1024 vfs_lookup_res_t lr;
1025 fibril_rwlock_read_lock(&namespace_rwlock);
1026 rc = vfs_lookup_internal(path, L_NONE, &lr, NULL);
1027 free(path);
1028 if (rc != EOK) {
1029 fibril_rwlock_read_unlock(&namespace_rwlock);
1030 async_answer_0(callid, rc);
1031 async_answer_0(rid, rc);
1032 return;
1033 }
1034 vfs_node_t *node = vfs_node_get(&lr);
1035 if (!node) {
1036 fibril_rwlock_read_unlock(&namespace_rwlock);
1037 async_answer_0(callid, ENOMEM);
1038 async_answer_0(rid, ENOMEM);
1039 return;
1040 }
1041
1042 fibril_rwlock_read_unlock(&namespace_rwlock);
1043
1044 async_exch_t *exch = vfs_exchange_grab(node->fs_handle);
1045
1046 aid_t msg;
1047 msg = async_send_3(exch, VFS_OUT_STAT, node->service_id,
1048 node->index, false, NULL);
1049 async_forward_fast(callid, exch, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1050
1051 vfs_exchange_release(exch);
1052
1053 sysarg_t rv;
1054 async_wait_for(msg, &rv);
1055
1056 async_answer_0(rid, rv);
1057
1058 vfs_node_put(node);
1059}
1060
1061void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request)
1062{
1063 int mode = IPC_GET_ARG1(*request);
1064
1065 char *path;
1066 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1067 if (rc != EOK) {
1068 async_answer_0(rid, rc);
1069 return;
1070 }
1071
1072 /* Ignore mode for now. */
1073 (void) mode;
1074
1075 fibril_rwlock_write_lock(&namespace_rwlock);
1076 int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE;
1077 rc = vfs_lookup_internal(path, lflag, NULL, NULL);
1078 fibril_rwlock_write_unlock(&namespace_rwlock);
1079 free(path);
1080 async_answer_0(rid, rc);
1081}
1082
1083void vfs_unlink(ipc_callid_t rid, ipc_call_t *request)
1084{
1085 int lflag = IPC_GET_ARG1(*request);
1086
1087 char *path;
1088 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1089 if (rc != EOK) {
1090 async_answer_0(rid, rc);
1091 return;
1092 }
1093
1094 fibril_rwlock_write_lock(&namespace_rwlock);
1095 lflag &= L_DIRECTORY; /* sanitize lflag */
1096 vfs_lookup_res_t lr;
1097 rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL);
1098 free(path);
1099 if (rc != EOK) {
1100 fibril_rwlock_write_unlock(&namespace_rwlock);
1101 async_answer_0(rid, rc);
1102 return;
1103 }
1104
1105 /*
1106 * The name has already been unlinked by vfs_lookup_internal().
1107 * We have to get and put the VFS node to ensure that it is
1108 * VFS_OUT_DESTROY'ed after the last reference to it is dropped.
1109 */
1110 vfs_node_t *node = vfs_node_get(&lr);
1111 fibril_mutex_lock(&nodes_mutex);
1112 node->lnkcnt--;
1113 fibril_mutex_unlock(&nodes_mutex);
1114 fibril_rwlock_write_unlock(&namespace_rwlock);
1115 vfs_node_put(node);
1116 async_answer_0(rid, EOK);
1117}
1118
1119void vfs_rename(ipc_callid_t rid, ipc_call_t *request)
1120{
1121 /* Retrieve the old path. */
1122 char *old;
1123 int rc = async_data_write_accept((void **) &old, true, 0, 0, 0, NULL);
1124 if (rc != EOK) {
1125 async_answer_0(rid, rc);
1126 return;
1127 }
1128
1129 /* Retrieve the new path. */
1130 char *new;
1131 rc = async_data_write_accept((void **) &new, true, 0, 0, 0, NULL);
1132 if (rc != EOK) {
1133 free(old);
1134 async_answer_0(rid, rc);
1135 return;
1136 }
1137
1138 size_t olen;
1139 size_t nlen;
1140 char *oldc = canonify(old, &olen);
1141 char *newc = canonify(new, &nlen);
1142
1143 if ((!oldc) || (!newc)) {
1144 async_answer_0(rid, EINVAL);
1145 free(old);
1146 free(new);
1147 return;
1148 }
1149
1150 oldc[olen] = '\0';
1151 newc[nlen] = '\0';
1152
1153 if ((!str_lcmp(newc, oldc, str_length(oldc))) &&
1154 ((newc[str_length(oldc)] == '/') ||
1155 (str_length(oldc) == 1) ||
1156 (str_length(oldc) == str_length(newc)))) {
1157 /*
1158 * oldc is a prefix of newc and either
1159 * - newc continues with a / where oldc ends, or
1160 * - oldc was / itself, or
1161 * - oldc and newc are equal.
1162 */
1163 async_answer_0(rid, EINVAL);
1164 free(old);
1165 free(new);
1166 return;
1167 }
1168
1169 vfs_lookup_res_t old_lr;
1170 vfs_lookup_res_t new_lr;
1171 vfs_lookup_res_t new_par_lr;
1172 fibril_rwlock_write_lock(&namespace_rwlock);
1173
1174 /* Lookup the node belonging to the old file name. */
1175 rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL);
1176 if (rc != EOK) {
1177 fibril_rwlock_write_unlock(&namespace_rwlock);
1178 async_answer_0(rid, rc);
1179 free(old);
1180 free(new);
1181 return;
1182 }
1183
1184 vfs_node_t *old_node = vfs_node_get(&old_lr);
1185 if (!old_node) {
1186 fibril_rwlock_write_unlock(&namespace_rwlock);
1187 async_answer_0(rid, ENOMEM);
1188 free(old);
1189 free(new);
1190 return;
1191 }
1192
1193 /* Determine the path to the parent of the node with the new name. */
1194 char *parentc = str_dup(newc);
1195 if (!parentc) {
1196 fibril_rwlock_write_unlock(&namespace_rwlock);
1197 vfs_node_put(old_node);
1198 async_answer_0(rid, rc);
1199 free(old);
1200 free(new);
1201 return;
1202 }
1203
1204 char *lastsl = str_rchr(parentc + 1, '/');
1205 if (lastsl)
1206 *lastsl = '\0';
1207 else
1208 parentc[1] = '\0';
1209
1210 /* Lookup parent of the new file name. */
1211 rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL);
1212 free(parentc); /* not needed anymore */
1213 if (rc != EOK) {
1214 fibril_rwlock_write_unlock(&namespace_rwlock);
1215 vfs_node_put(old_node);
1216 async_answer_0(rid, rc);
1217 free(old);
1218 free(new);
1219 return;
1220 }
1221
1222 /* Check whether linking to the same file system instance. */
1223 if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) ||
1224 (old_node->service_id != new_par_lr.triplet.service_id)) {
1225 fibril_rwlock_write_unlock(&namespace_rwlock);
1226 vfs_node_put(old_node);
1227 async_answer_0(rid, EXDEV); /* different file systems */
1228 free(old);
1229 free(new);
1230 return;
1231 }
1232
1233 /* Destroy the old link for the new name. */
1234 vfs_node_t *new_node = NULL;
1235 rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL);
1236
1237 switch (rc) {
1238 case ENOENT:
1239 /* simply not in our way */
1240 break;
1241 case EOK:
1242 new_node = vfs_node_get(&new_lr);
1243 if (!new_node) {
1244 fibril_rwlock_write_unlock(&namespace_rwlock);
1245 vfs_node_put(old_node);
1246 async_answer_0(rid, ENOMEM);
1247 free(old);
1248 free(new);
1249 return;
1250 }
1251 fibril_mutex_lock(&nodes_mutex);
1252 new_node->lnkcnt--;
1253 fibril_mutex_unlock(&nodes_mutex);
1254 break;
1255 default:
1256 fibril_rwlock_write_unlock(&namespace_rwlock);
1257 vfs_node_put(old_node);
1258 async_answer_0(rid, ENOTEMPTY);
1259 free(old);
1260 free(new);
1261 return;
1262 }
1263
1264 /* Create the new link for the new name. */
1265 rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index);
1266 if (rc != EOK) {
1267 fibril_rwlock_write_unlock(&namespace_rwlock);
1268 vfs_node_put(old_node);
1269 if (new_node)
1270 vfs_node_put(new_node);
1271 async_answer_0(rid, rc);
1272 free(old);
1273 free(new);
1274 return;
1275 }
1276
1277 fibril_mutex_lock(&nodes_mutex);
1278 old_node->lnkcnt++;
1279 fibril_mutex_unlock(&nodes_mutex);
1280
1281 /* Destroy the link for the old name. */
1282 rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL);
1283 if (rc != EOK) {
1284 fibril_rwlock_write_unlock(&namespace_rwlock);
1285 vfs_node_put(old_node);
1286 if (new_node)
1287 vfs_node_put(new_node);
1288 async_answer_0(rid, rc);
1289 free(old);
1290 free(new);
1291 return;
1292 }
1293
1294 fibril_mutex_lock(&nodes_mutex);
1295 old_node->lnkcnt--;
1296 fibril_mutex_unlock(&nodes_mutex);
1297 fibril_rwlock_write_unlock(&namespace_rwlock);
1298 vfs_node_put(old_node);
1299
1300 if (new_node)
1301 vfs_node_put(new_node);
1302
1303 free(old);
1304 free(new);
1305 async_answer_0(rid, EOK);
1306}
1307
1308void vfs_dup(ipc_callid_t rid, ipc_call_t *request)
1309{
1310 int oldfd = IPC_GET_ARG1(*request);
1311 int newfd = IPC_GET_ARG2(*request);
1312
1313 /* If the file descriptors are the same, do nothing. */
1314 if (oldfd == newfd) {
1315 async_answer_1(rid, EOK, newfd);
1316 return;
1317 }
1318
1319 /* Lookup the file structure corresponding to oldfd. */
1320 vfs_file_t *oldfile = vfs_file_get(oldfd);
1321 if (!oldfile) {
1322 async_answer_0(rid, EBADF);
1323 return;
1324 }
1325
1326 /*
1327 * Lock the open file structure so that no other thread can manipulate
1328 * the same open file at a time.
1329 */
1330 fibril_mutex_lock(&oldfile->lock);
1331
1332 /* Make sure newfd is closed. */
1333 (void) vfs_fd_free(newfd);
1334
1335 /* Assign the old file to newfd. */
1336 int ret = vfs_fd_assign(oldfile, newfd);
1337 fibril_mutex_unlock(&oldfile->lock);
1338 vfs_file_put(oldfile);
1339
1340 if (ret != EOK)
1341 async_answer_0(rid, ret);
1342 else
1343 async_answer_1(rid, EOK, newfd);
1344}
1345
1346void vfs_wait_handle(ipc_callid_t rid, ipc_call_t *request)
1347{
1348 int fd = vfs_wait_handle_internal();
1349 async_answer_1(rid, EOK, fd);
1350}
1351
1352void vfs_get_mtab(ipc_callid_t rid, ipc_call_t *request)
1353{
1354 ipc_callid_t callid;
1355 ipc_call_t data;
1356 sysarg_t rc = EOK;
1357 size_t len;
1358
1359 fibril_mutex_lock(&mtab_list_lock);
1360
1361 /* Send to the caller the number of mounted filesystems */
1362 callid = async_get_call(&data);
1363 if (IPC_GET_IMETHOD(data) != VFS_IN_PING) {
1364 rc = ENOTSUP;
1365 async_answer_0(callid, rc);
1366 goto exit;
1367 }
1368 async_answer_1(callid, EOK, mtab_size);
1369
1370 list_foreach(mtab_list, link, mtab_ent_t, mtab_ent) {
1371 rc = ENOTSUP;
1372
1373 if (!async_data_read_receive(&callid, &len)) {
1374 async_answer_0(callid, rc);
1375 goto exit;
1376 }
1377
1378 (void) async_data_read_finalize(callid, mtab_ent->mp,
1379 str_size(mtab_ent->mp));
1380
1381 if (!async_data_read_receive(&callid, &len)) {
1382 async_answer_0(callid, rc);
1383 goto exit;
1384 }
1385
1386 (void) async_data_read_finalize(callid, mtab_ent->opts,
1387 str_size(mtab_ent->opts));
1388
1389 if (!async_data_read_receive(&callid, &len)) {
1390 async_answer_0(callid, rc);
1391 goto exit;
1392 }
1393
1394 (void) async_data_read_finalize(callid, mtab_ent->fs_name,
1395 str_size(mtab_ent->fs_name));
1396
1397 callid = async_get_call(&data);
1398
1399 if (IPC_GET_IMETHOD(data) != VFS_IN_PING) {
1400 async_answer_0(callid, rc);
1401 goto exit;
1402 }
1403
1404 rc = EOK;
1405 async_answer_2(callid, rc, mtab_ent->instance,
1406 mtab_ent->service_id);
1407 }
1408
1409exit:
1410 fibril_mutex_unlock(&mtab_list_lock);
1411 async_answer_0(rid, rc);
1412}
1413
1414void vfs_statfs(ipc_callid_t rid, ipc_call_t *request)
1415{
1416 char *path;
1417 int rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
1418 if (rc != EOK) {
1419 async_answer_0(rid, rc);
1420 return;
1421 }
1422
1423 ipc_callid_t callid;
1424 if (!async_data_read_receive(&callid, NULL)) {
1425 free(path);
1426 async_answer_0(callid, EINVAL);
1427 async_answer_0(rid, EINVAL);
1428 return;
1429 }
1430
1431 vfs_lookup_res_t lr;
1432 fibril_rwlock_read_lock(&namespace_rwlock);
1433 rc = vfs_lookup_internal(path, L_NONE, &lr, NULL);
1434 free(path);
1435 if (rc != EOK) {
1436 fibril_rwlock_read_unlock(&namespace_rwlock);
1437 async_answer_0(callid, rc);
1438 async_answer_0(rid, rc);
1439 return;
1440 }
1441 vfs_node_t *node = vfs_node_get(&lr);
1442 if (!node) {
1443 fibril_rwlock_read_unlock(&namespace_rwlock);
1444 async_answer_0(callid, ENOMEM);
1445 async_answer_0(rid, ENOMEM);
1446 return;
1447 }
1448
1449 fibril_rwlock_read_unlock(&namespace_rwlock);
1450
1451 async_exch_t *exch = vfs_exchange_grab(node->fs_handle);
1452
1453 aid_t msg;
1454 msg = async_send_3(exch, VFS_OUT_STATFS, node->service_id,
1455 node->index, false, NULL);
1456 async_forward_fast(callid, exch, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
1457
1458 vfs_exchange_release(exch);
1459
1460 sysarg_t rv;
1461 async_wait_for(msg, &rv);
1462
1463 async_answer_0(rid, rv);
1464
1465 vfs_node_put(node);
1466}
1467
1468/**
1469 * @}
1470 */
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