source: mainline/uspace/lib/fs/libfs.c@ dbf5d7c

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since dbf5d7c was fafb8e5, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 7 years ago

Mechanically lowercase IPC_SET_*/IPC_GET_*
  • Property mode set to 100644
File size: 20.2 KB
Line 
1/*
2 * Copyright (c) 2009 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 libfs
30 * @{
31 */
32/**
33 * @file
34 * Glue code which is common to all FS implementations.
35 */
36
37#include "libfs.h"
38#include <macros.h>
39#include <errno.h>
40#include <async.h>
41#include <as.h>
42#include <assert.h>
43#include <dirent.h>
44#include <mem.h>
45#include <str.h>
46#include <stdlib.h>
47#include <fibril_synch.h>
48#include <ipc/vfs.h>
49#include <vfs/vfs.h>
50
51#define on_error(rc, action) \
52 do { \
53 if ((rc) != EOK) \
54 action; \
55 } while (0)
56
57#define combine_rc(rc1, rc2) \
58 ((rc1) == EOK ? (rc2) : (rc1))
59
60#define answer_and_return(call, rc) \
61 do { \
62 async_answer_0((call), (rc)); \
63 return; \
64 } while (0)
65
66static fs_reg_t reg;
67
68static vfs_out_ops_t *vfs_out_ops = NULL;
69static libfs_ops_t *libfs_ops = NULL;
70
71static char fs_name[FS_NAME_MAXLEN + 1];
72
73static void libfs_link(libfs_ops_t *, fs_handle_t, ipc_call_t *);
74static void libfs_lookup(libfs_ops_t *, fs_handle_t, ipc_call_t *);
75static void libfs_stat(libfs_ops_t *, fs_handle_t, ipc_call_t *);
76static void libfs_open_node(libfs_ops_t *, fs_handle_t, ipc_call_t *);
77static void libfs_statfs(libfs_ops_t *, fs_handle_t, ipc_call_t *);
78
79static void vfs_out_fsprobe(ipc_call_t *req)
80{
81 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
82 errno_t rc;
83 vfs_fs_probe_info_t info;
84
85 ipc_call_t call;
86 size_t size;
87 if ((!async_data_read_receive(&call, &size)) ||
88 (size != sizeof(info))) {
89 async_answer_0(&call, EIO);
90 async_answer_0(req, EIO);
91 return;
92 }
93
94 memset(&info, 0, sizeof(info));
95 rc = vfs_out_ops->fsprobe(service_id, &info);
96 if (rc != EOK) {
97 async_answer_0(&call, EIO);
98 async_answer_0(req, rc);
99 return;
100 }
101
102 async_data_read_finalize(&call, &info, sizeof(info));
103 async_answer_0(req, EOK);
104}
105
106static void vfs_out_mounted(ipc_call_t *req)
107{
108 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
109 char *opts;
110 errno_t rc;
111
112 /* Accept the mount options. */
113 rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
114 if (rc != EOK) {
115 async_answer_0(req, rc);
116 return;
117 }
118
119 fs_index_t index;
120 aoff64_t size;
121 rc = vfs_out_ops->mounted(service_id, opts, &index, &size);
122
123 if (rc == EOK) {
124 async_answer_3(req, EOK, index, LOWER32(size),
125 UPPER32(size));
126 } else
127 async_answer_0(req, rc);
128
129 free(opts);
130}
131
132static void vfs_out_unmounted(ipc_call_t *req)
133{
134 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
135 errno_t rc;
136
137 rc = vfs_out_ops->unmounted(service_id);
138
139 async_answer_0(req, rc);
140}
141
142static void vfs_out_link(ipc_call_t *req)
143{
144 libfs_link(libfs_ops, reg.fs_handle, req);
145}
146
147static void vfs_out_lookup(ipc_call_t *req)
148{
149 libfs_lookup(libfs_ops, reg.fs_handle, req);
150}
151
152static void vfs_out_read(ipc_call_t *req)
153{
154 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
155 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
156 aoff64_t pos = (aoff64_t) MERGE_LOUP32(ipc_get_arg3(req),
157 ipc_get_arg4(req));
158 size_t rbytes;
159 errno_t rc;
160
161 rc = vfs_out_ops->read(service_id, index, pos, &rbytes);
162
163 if (rc == EOK)
164 async_answer_1(req, EOK, rbytes);
165 else
166 async_answer_0(req, rc);
167}
168
169static void vfs_out_write(ipc_call_t *req)
170{
171 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
172 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
173 aoff64_t pos = (aoff64_t) MERGE_LOUP32(ipc_get_arg3(req),
174 ipc_get_arg4(req));
175 size_t wbytes;
176 aoff64_t nsize;
177 errno_t rc;
178
179 rc = vfs_out_ops->write(service_id, index, pos, &wbytes, &nsize);
180
181 if (rc == EOK) {
182 async_answer_3(req, EOK, wbytes, LOWER32(nsize),
183 UPPER32(nsize));
184 } else
185 async_answer_0(req, rc);
186}
187
188static void vfs_out_truncate(ipc_call_t *req)
189{
190 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
191 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
192 aoff64_t size = (aoff64_t) MERGE_LOUP32(ipc_get_arg3(req),
193 ipc_get_arg4(req));
194 errno_t rc;
195
196 rc = vfs_out_ops->truncate(service_id, index, size);
197
198 async_answer_0(req, rc);
199}
200
201static void vfs_out_close(ipc_call_t *req)
202{
203 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
204 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
205 errno_t rc;
206
207 rc = vfs_out_ops->close(service_id, index);
208
209 async_answer_0(req, rc);
210}
211
212static void vfs_out_destroy(ipc_call_t *req)
213{
214 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
215 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
216
217 errno_t rc;
218 fs_node_t *node = NULL;
219 rc = libfs_ops->node_get(&node, service_id, index);
220 if (rc == EOK && node != NULL) {
221 bool destroy = (libfs_ops->lnkcnt_get(node) == 0);
222 libfs_ops->node_put(node);
223 if (destroy)
224 rc = vfs_out_ops->destroy(service_id, index);
225 }
226 async_answer_0(req, rc);
227}
228
229static void vfs_out_open_node(ipc_call_t *req)
230{
231 libfs_open_node(libfs_ops, reg.fs_handle, req);
232}
233
234static void vfs_out_stat(ipc_call_t *req)
235{
236 libfs_stat(libfs_ops, reg.fs_handle, req);
237}
238
239static void vfs_out_sync(ipc_call_t *req)
240{
241 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
242 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
243 errno_t rc;
244
245 rc = vfs_out_ops->sync(service_id, index);
246
247 async_answer_0(req, rc);
248}
249
250static void vfs_out_statfs(ipc_call_t *req)
251{
252 libfs_statfs(libfs_ops, reg.fs_handle, req);
253}
254
255static void vfs_out_is_empty(ipc_call_t *req)
256{
257 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
258 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
259 errno_t rc;
260
261 fs_node_t *node = NULL;
262 rc = libfs_ops->node_get(&node, service_id, index);
263 if (rc != EOK)
264 async_answer_0(req, rc);
265 if (node == NULL)
266 async_answer_0(req, EINVAL);
267
268 bool children = false;
269 rc = libfs_ops->has_children(&children, node);
270 libfs_ops->node_put(node);
271
272 if (rc != EOK)
273 async_answer_0(req, rc);
274 async_answer_0(req, children ? ENOTEMPTY : EOK);
275}
276
277static void vfs_connection(ipc_call_t *icall, void *arg)
278{
279 if (icall->cap_handle) {
280 /*
281 * This only happens for connections opened by
282 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
283 * created by IPC_M_CONNECT_TO_ME.
284 */
285 async_accept_0(icall);
286 }
287
288 while (true) {
289 ipc_call_t call;
290 async_get_call(&call);
291
292 if (!ipc_get_imethod(&call)) {
293 async_answer_0(&call, EOK);
294 return;
295 }
296
297 switch (ipc_get_imethod(&call)) {
298 case VFS_OUT_FSPROBE:
299 vfs_out_fsprobe(&call);
300 break;
301 case VFS_OUT_MOUNTED:
302 vfs_out_mounted(&call);
303 break;
304 case VFS_OUT_UNMOUNTED:
305 vfs_out_unmounted(&call);
306 break;
307 case VFS_OUT_LINK:
308 vfs_out_link(&call);
309 break;
310 case VFS_OUT_LOOKUP:
311 vfs_out_lookup(&call);
312 break;
313 case VFS_OUT_READ:
314 vfs_out_read(&call);
315 break;
316 case VFS_OUT_WRITE:
317 vfs_out_write(&call);
318 break;
319 case VFS_OUT_TRUNCATE:
320 vfs_out_truncate(&call);
321 break;
322 case VFS_OUT_CLOSE:
323 vfs_out_close(&call);
324 break;
325 case VFS_OUT_DESTROY:
326 vfs_out_destroy(&call);
327 break;
328 case VFS_OUT_OPEN_NODE:
329 vfs_out_open_node(&call);
330 break;
331 case VFS_OUT_STAT:
332 vfs_out_stat(&call);
333 break;
334 case VFS_OUT_SYNC:
335 vfs_out_sync(&call);
336 break;
337 case VFS_OUT_STATFS:
338 vfs_out_statfs(&call);
339 break;
340 case VFS_OUT_IS_EMPTY:
341 vfs_out_is_empty(&call);
342 break;
343 default:
344 async_answer_0(&call, ENOTSUP);
345 break;
346 }
347 }
348}
349
350/** Register file system server.
351 *
352 * This function abstracts away the tedious registration protocol from
353 * file system implementations and lets them to reuse this registration glue
354 * code.
355 *
356 * @param sess Session for communication with VFS.
357 * @param info VFS info structure supplied by the file system
358 * implementation.
359 * @param vops Address of the vfs_out_ops_t structure.
360 * @param lops Address of the libfs_ops_t structure.
361 *
362 * @return EOK on success or a non-zero error code on errror.
363 *
364 */
365errno_t fs_register(async_sess_t *sess, vfs_info_t *info, vfs_out_ops_t *vops,
366 libfs_ops_t *lops)
367{
368 /*
369 * Tell VFS that we are here and want to get registered.
370 * We use the async framework because VFS will answer the request
371 * out-of-order, when it knows that the operation succeeded or failed.
372 */
373
374 async_exch_t *exch = async_exchange_begin(sess);
375
376 ipc_call_t answer;
377 aid_t req = async_send_0(exch, VFS_IN_REGISTER, &answer);
378
379 /*
380 * Send our VFS info structure to VFS.
381 */
382 errno_t rc = async_data_write_start(exch, info, sizeof(*info));
383
384 if (rc != EOK) {
385 async_exchange_end(exch);
386 async_forget(req);
387 return rc;
388 }
389
390 /*
391 * Set VFS_OUT and libfs operations.
392 */
393 vfs_out_ops = vops;
394 libfs_ops = lops;
395
396 str_cpy(fs_name, sizeof(fs_name), info->name);
397
398 /*
399 * Ask VFS for callback connection.
400 */
401 port_id_t port;
402 rc = async_create_callback_port(exch, INTERFACE_VFS_DRIVER_CB, 0, 0,
403 vfs_connection, NULL, &port);
404
405 /*
406 * Request sharing the Path Lookup Buffer with VFS.
407 */
408 rc = async_share_in_start_0_0(exch, PLB_SIZE, (void *) &reg.plb_ro);
409 if (reg.plb_ro == AS_MAP_FAILED) {
410 async_exchange_end(exch);
411 async_forget(req);
412 return ENOMEM;
413 }
414
415 async_exchange_end(exch);
416
417 if (rc) {
418 async_forget(req);
419 return rc;
420 }
421
422 /*
423 * Pick up the answer for the request to the VFS_IN_REQUEST call.
424 */
425 async_wait_for(req, NULL);
426 reg.fs_handle = (int) ipc_get_arg1(&answer);
427
428 return ipc_get_retval(&answer);
429}
430
431void fs_node_initialize(fs_node_t *fn)
432{
433 memset(fn, 0, sizeof(fs_node_t));
434}
435
436static char plb_get_char(unsigned pos)
437{
438 return reg.plb_ro[pos % PLB_SIZE];
439}
440
441static errno_t plb_get_component(char *dest, unsigned *sz, unsigned *ppos,
442 unsigned last)
443{
444 unsigned pos = *ppos;
445 unsigned size = 0;
446
447 if (pos == last) {
448 *sz = 0;
449 return ERANGE;
450 }
451
452 char c = plb_get_char(pos);
453 if (c == '/')
454 pos++;
455
456 for (int i = 0; i <= NAME_MAX; i++) {
457 c = plb_get_char(pos);
458 if (pos == last || c == '/') {
459 dest[i] = 0;
460 *ppos = pos;
461 *sz = size;
462 return EOK;
463 }
464 dest[i] = c;
465 pos++;
466 size++;
467 }
468 return ENAMETOOLONG;
469}
470
471static errno_t receive_fname(char *buffer)
472{
473 ipc_call_t call;
474 size_t size;
475
476 if (!async_data_write_receive(&call, &size))
477 return ENOENT;
478
479 if (size > NAME_MAX + 1) {
480 async_answer_0(&call, ERANGE);
481 return ERANGE;
482 }
483
484 return async_data_write_finalize(&call, buffer, size);
485}
486
487/** Link a file at a path.
488 *
489 */
490void libfs_link(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_call_t *req)
491{
492 service_id_t parent_sid = ipc_get_arg1(req);
493 fs_index_t parent_index = ipc_get_arg2(req);
494 fs_index_t child_index = ipc_get_arg3(req);
495
496 char component[NAME_MAX + 1];
497 errno_t rc = receive_fname(component);
498 if (rc != EOK) {
499 async_answer_0(req, rc);
500 return;
501 }
502
503 fs_node_t *parent = NULL;
504 rc = ops->node_get(&parent, parent_sid, parent_index);
505 if (parent == NULL) {
506 async_answer_0(req, rc == EOK ? EBADF : rc);
507 return;
508 }
509
510 fs_node_t *child = NULL;
511 rc = ops->node_get(&child, parent_sid, child_index);
512 if (child == NULL) {
513 async_answer_0(req, rc == EOK ? EBADF : rc);
514 ops->node_put(parent);
515 return;
516 }
517
518 rc = ops->link(parent, child, component);
519 ops->node_put(parent);
520 ops->node_put(child);
521 async_answer_0(req, rc);
522}
523
524/** Lookup VFS triplet by name in the file system name space.
525 *
526 * The path passed in the PLB must be in the canonical file system path format
527 * as returned by the canonify() function.
528 *
529 * @param ops libfs operations structure with function pointers to
530 * file system implementation
531 * @param fs_handle File system handle of the file system where to perform
532 * the lookup.
533 * @param req VFS_OUT_LOOKUP request data itself.
534 *
535 */
536void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_call_t *req)
537{
538 unsigned first = ipc_get_arg1(req);
539 unsigned len = ipc_get_arg2(req);
540 service_id_t service_id = ipc_get_arg3(req);
541 fs_index_t index = ipc_get_arg4(req);
542 int lflag = ipc_get_arg5(req);
543
544 // TODO: Validate flags.
545
546 unsigned next = first;
547 unsigned last = first + len;
548
549 char component[NAME_MAX + 1];
550 errno_t rc;
551
552 fs_node_t *par = NULL;
553 fs_node_t *cur = NULL;
554 fs_node_t *tmp = NULL;
555 unsigned clen = 0;
556
557 rc = ops->node_get(&cur, service_id, index);
558 if (rc != EOK) {
559 async_answer_0(req, rc);
560 goto out;
561 }
562
563 assert(cur != NULL);
564
565 /* Find the file and its parent. */
566
567 unsigned last_next = 0;
568
569 while (next != last) {
570 if (cur == NULL) {
571 assert(par != NULL);
572 goto out1;
573 }
574
575 if (!ops->is_directory(cur)) {
576 async_answer_0(req, ENOTDIR);
577 goto out;
578 }
579
580 last_next = next;
581 /* Collect the component */
582 rc = plb_get_component(component, &clen, &next, last);
583 assert(rc != ERANGE);
584 if (rc != EOK) {
585 async_answer_0(req, rc);
586 goto out;
587 }
588
589 if (clen == 0) {
590 /* The path is just "/". */
591 break;
592 }
593
594 assert(component[clen] == 0);
595
596 /* Match the component */
597 rc = ops->match(&tmp, cur, component);
598 if (rc != EOK) {
599 async_answer_0(req, rc);
600 goto out;
601 }
602
603 /* Descend one level */
604 if (par) {
605 rc = ops->node_put(par);
606 if (rc != EOK) {
607 async_answer_0(req, rc);
608 goto out;
609 }
610 }
611
612 par = cur;
613 cur = tmp;
614 tmp = NULL;
615 }
616
617 /*
618 * At this point, par is either NULL or a directory.
619 * If cur is NULL, the looked up file does not exist yet.
620 */
621
622 assert(par == NULL || ops->is_directory(par));
623 assert(par != NULL || cur != NULL);
624
625 /* Check for some error conditions. */
626
627 if (cur && (lflag & L_FILE) && (ops->is_directory(cur))) {
628 async_answer_0(req, EISDIR);
629 goto out;
630 }
631
632 if (cur && (lflag & L_DIRECTORY) && (ops->is_file(cur))) {
633 async_answer_0(req, ENOTDIR);
634 goto out;
635 }
636
637 /* Unlink. */
638
639 if (lflag & L_UNLINK) {
640 if (!cur) {
641 async_answer_0(req, ENOENT);
642 goto out;
643 }
644 if (!par) {
645 async_answer_0(req, EINVAL);
646 goto out;
647 }
648
649 rc = ops->unlink(par, cur, component);
650 if (rc == EOK) {
651 aoff64_t size = ops->size_get(cur);
652 async_answer_5(req, EOK, fs_handle,
653 ops->index_get(cur),
654 (ops->is_directory(cur) << 16) | last,
655 LOWER32(size), UPPER32(size));
656 } else {
657 async_answer_0(req, rc);
658 }
659 goto out;
660 }
661
662 /* Create. */
663
664 if (lflag & L_CREATE) {
665 if (cur && (lflag & L_EXCLUSIVE)) {
666 async_answer_0(req, EEXIST);
667 goto out;
668 }
669
670 if (!cur) {
671 rc = ops->create(&cur, service_id,
672 lflag & (L_FILE | L_DIRECTORY));
673 if (rc != EOK) {
674 async_answer_0(req, rc);
675 goto out;
676 }
677 if (!cur) {
678 async_answer_0(req, ENOSPC);
679 goto out;
680 }
681
682 rc = ops->link(par, cur, component);
683 if (rc != EOK) {
684 (void) ops->destroy(cur);
685 cur = NULL;
686 async_answer_0(req, rc);
687 goto out;
688 }
689 }
690 }
691
692 /* Return. */
693out1:
694 if (!cur) {
695 async_answer_5(req, EOK, fs_handle, ops->index_get(par),
696 (ops->is_directory(par) << 16) | last_next,
697 LOWER32(ops->size_get(par)), UPPER32(ops->size_get(par)));
698 goto out;
699 }
700
701 async_answer_5(req, EOK, fs_handle, ops->index_get(cur),
702 (ops->is_directory(cur) << 16) | last, LOWER32(ops->size_get(cur)),
703 UPPER32(ops->size_get(cur)));
704
705out:
706 if (par)
707 (void) ops->node_put(par);
708
709 if (cur)
710 (void) ops->node_put(cur);
711
712 if (tmp)
713 (void) ops->node_put(tmp);
714}
715
716void libfs_stat(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_call_t *req)
717{
718 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
719 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
720
721 fs_node_t *fn;
722 errno_t rc = ops->node_get(&fn, service_id, index);
723 on_error(rc, answer_and_return(req, rc));
724
725 ipc_call_t call;
726 size_t size;
727 if ((!async_data_read_receive(&call, &size)) ||
728 (size != sizeof(vfs_stat_t))) {
729 ops->node_put(fn);
730 async_answer_0(&call, EINVAL);
731 async_answer_0(req, EINVAL);
732 return;
733 }
734
735 vfs_stat_t stat;
736 memset(&stat, 0, sizeof(vfs_stat_t));
737
738 stat.fs_handle = fs_handle;
739 stat.service_id = service_id;
740 stat.index = index;
741 stat.lnkcnt = ops->lnkcnt_get(fn);
742 stat.is_file = ops->is_file(fn);
743 stat.is_directory = ops->is_directory(fn);
744 stat.size = ops->size_get(fn);
745 stat.service = ops->service_get(fn);
746
747 ops->node_put(fn);
748
749 async_data_read_finalize(&call, &stat, sizeof(vfs_stat_t));
750 async_answer_0(req, EOK);
751}
752
753void libfs_statfs(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_call_t *req)
754{
755 service_id_t service_id = (service_id_t) ipc_get_arg1(req);
756 fs_index_t index = (fs_index_t) ipc_get_arg2(req);
757
758 fs_node_t *fn;
759 errno_t rc = ops->node_get(&fn, service_id, index);
760 on_error(rc, answer_and_return(req, rc));
761
762 ipc_call_t call;
763 size_t size;
764 if ((!async_data_read_receive(&call, &size)) ||
765 (size != sizeof(vfs_statfs_t))) {
766 goto error;
767 }
768
769 vfs_statfs_t st;
770 memset(&st, 0, sizeof(vfs_statfs_t));
771
772 str_cpy(st.fs_name, sizeof(st.fs_name), fs_name);
773
774 if (ops->size_block != NULL) {
775 rc = ops->size_block(service_id, &st.f_bsize);
776 if (rc != EOK)
777 goto error;
778 }
779
780 if (ops->total_block_count != NULL) {
781 rc = ops->total_block_count(service_id, &st.f_blocks);
782 if (rc != EOK)
783 goto error;
784 }
785
786 if (ops->free_block_count != NULL) {
787 rc = ops->free_block_count(service_id, &st.f_bfree);
788 if (rc != EOK)
789 goto error;
790 }
791
792 ops->node_put(fn);
793 async_data_read_finalize(&call, &st, sizeof(vfs_statfs_t));
794 async_answer_0(req, EOK);
795 return;
796
797error:
798 ops->node_put(fn);
799 async_answer_0(&call, EINVAL);
800 async_answer_0(req, EINVAL);
801}
802
803/** Open VFS triplet.
804 *
805 * @param ops libfs operations structure with function pointers to
806 * file system implementation
807 * @param req VFS_OUT_OPEN_NODE request data itself.
808 *
809 */
810void libfs_open_node(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_call_t *req)
811{
812 service_id_t service_id = ipc_get_arg1(req);
813 fs_index_t index = ipc_get_arg2(req);
814
815 fs_node_t *fn;
816 errno_t rc = ops->node_get(&fn, service_id, index);
817 on_error(rc, answer_and_return(req, rc));
818
819 if (fn == NULL) {
820 async_answer_0(req, ENOENT);
821 return;
822 }
823
824 rc = ops->node_open(fn);
825 aoff64_t size = ops->size_get(fn);
826 async_answer_4(req, rc, LOWER32(size), UPPER32(size),
827 ops->lnkcnt_get(fn),
828 (ops->is_file(fn) ? L_FILE : 0) |
829 (ops->is_directory(fn) ? L_DIRECTORY : 0));
830
831 (void) ops->node_put(fn);
832}
833
834static FIBRIL_MUTEX_INITIALIZE(instances_mutex);
835static LIST_INITIALIZE(instances_list);
836
837typedef struct {
838 service_id_t service_id;
839 link_t link;
840 void *data;
841} fs_instance_t;
842
843errno_t fs_instance_create(service_id_t service_id, void *data)
844{
845 fs_instance_t *inst = malloc(sizeof(fs_instance_t));
846 if (!inst)
847 return ENOMEM;
848
849 link_initialize(&inst->link);
850 inst->service_id = service_id;
851 inst->data = data;
852
853 fibril_mutex_lock(&instances_mutex);
854 list_foreach(instances_list, link, fs_instance_t, cur) {
855 if (cur->service_id == service_id) {
856 fibril_mutex_unlock(&instances_mutex);
857 free(inst);
858 return EEXIST;
859 }
860
861 /* keep the list sorted */
862 if (cur->service_id < service_id) {
863 list_insert_before(&inst->link, &cur->link);
864 fibril_mutex_unlock(&instances_mutex);
865 return EOK;
866 }
867 }
868 list_append(&inst->link, &instances_list);
869 fibril_mutex_unlock(&instances_mutex);
870
871 return EOK;
872}
873
874errno_t fs_instance_get(service_id_t service_id, void **idp)
875{
876 fibril_mutex_lock(&instances_mutex);
877
878 list_foreach(instances_list, link, fs_instance_t, inst) {
879 if (inst->service_id == service_id) {
880 *idp = inst->data;
881 fibril_mutex_unlock(&instances_mutex);
882 return EOK;
883 }
884 }
885
886 fibril_mutex_unlock(&instances_mutex);
887 return ENOENT;
888}
889
890errno_t fs_instance_destroy(service_id_t service_id)
891{
892 fibril_mutex_lock(&instances_mutex);
893
894 list_foreach(instances_list, link, fs_instance_t, inst) {
895 if (inst->service_id == service_id) {
896 list_remove(&inst->link);
897 fibril_mutex_unlock(&instances_mutex);
898 free(inst);
899 return EOK;
900 }
901 }
902
903 fibril_mutex_unlock(&instances_mutex);
904 return ENOENT;
905}
906
907/** @}
908 */
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