source: mainline/uspace/lib/fs/libfs.c@ 3061bc1

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3061bc1 was 1b20da0, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 7 years ago

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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(rid, rc) \
61 do { \
62 async_answer_0((rid), (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_callid_t,
74 ipc_call_t *);
75static void libfs_lookup(libfs_ops_t *, fs_handle_t, ipc_callid_t,
76 ipc_call_t *);
77static void libfs_stat(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
78static void libfs_open_node(libfs_ops_t *, fs_handle_t, ipc_callid_t,
79 ipc_call_t *);
80static void libfs_statfs(libfs_ops_t *, fs_handle_t, ipc_callid_t,
81 ipc_call_t *);
82
83static void vfs_out_fsprobe(ipc_callid_t rid, ipc_call_t *req)
84{
85 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
86 errno_t rc;
87 vfs_fs_probe_info_t info;
88
89 ipc_callid_t callid;
90 size_t size;
91 if ((!async_data_read_receive(&callid, &size)) ||
92 (size != sizeof(info))) {
93 async_answer_0(callid, EIO);
94 async_answer_0(rid, EIO);
95 return;
96 }
97
98 memset(&info, 0, sizeof(info));
99 rc = vfs_out_ops->fsprobe(service_id, &info);
100 if (rc != EOK) {
101 async_answer_0(callid, EIO);
102 async_answer_0(rid, rc);
103 return;
104 }
105
106 async_data_read_finalize(callid, &info, sizeof(info));
107 async_answer_0(rid, EOK);
108}
109
110static void vfs_out_mounted(ipc_callid_t rid, ipc_call_t *req)
111{
112 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
113 char *opts;
114 errno_t rc;
115
116 /* Accept the mount options. */
117 rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
118 if (rc != EOK) {
119 async_answer_0(rid, rc);
120 return;
121 }
122
123 fs_index_t index;
124 aoff64_t size;
125 rc = vfs_out_ops->mounted(service_id, opts, &index, &size);
126
127 if (rc == EOK)
128 async_answer_3(rid, EOK, index, LOWER32(size), UPPER32(size));
129 else
130 async_answer_0(rid, rc);
131
132 free(opts);
133}
134
135static void vfs_out_unmounted(ipc_callid_t rid, ipc_call_t *req)
136{
137 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
138 errno_t rc;
139
140 rc = vfs_out_ops->unmounted(service_id);
141
142 async_answer_0(rid, rc);
143}
144
145static void vfs_out_link(ipc_callid_t rid, ipc_call_t *req)
146{
147 libfs_link(libfs_ops, reg.fs_handle, rid, req);
148}
149
150static void vfs_out_lookup(ipc_callid_t rid, ipc_call_t *req)
151{
152 libfs_lookup(libfs_ops, reg.fs_handle, rid, req);
153}
154
155static void vfs_out_read(ipc_callid_t rid, ipc_call_t *req)
156{
157 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
158 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
159 aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
160 IPC_GET_ARG4(*req));
161 size_t rbytes;
162 errno_t rc;
163
164 rc = vfs_out_ops->read(service_id, index, pos, &rbytes);
165
166 if (rc == EOK)
167 async_answer_1(rid, EOK, rbytes);
168 else
169 async_answer_0(rid, rc);
170}
171
172static void vfs_out_write(ipc_callid_t rid, ipc_call_t *req)
173{
174 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
175 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
176 aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
177 IPC_GET_ARG4(*req));
178 size_t wbytes;
179 aoff64_t nsize;
180 errno_t rc;
181
182 rc = vfs_out_ops->write(service_id, index, pos, &wbytes, &nsize);
183
184 if (rc == EOK) {
185 async_answer_3(rid, EOK, wbytes, LOWER32(nsize),
186 UPPER32(nsize));
187 } else
188 async_answer_0(rid, rc);
189}
190
191static void vfs_out_truncate(ipc_callid_t rid, ipc_call_t *req)
192{
193 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
194 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
195 aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
196 IPC_GET_ARG4(*req));
197 errno_t rc;
198
199 rc = vfs_out_ops->truncate(service_id, index, size);
200
201 async_answer_0(rid, rc);
202}
203
204static void vfs_out_close(ipc_callid_t rid, ipc_call_t *req)
205{
206 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
207 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
208 errno_t rc;
209
210 rc = vfs_out_ops->close(service_id, index);
211
212 async_answer_0(rid, rc);
213}
214
215static void vfs_out_destroy(ipc_callid_t rid, ipc_call_t *req)
216{
217 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
218 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
219
220 errno_t rc;
221 fs_node_t *node = NULL;
222 rc = libfs_ops->node_get(&node, service_id, index);
223 if (rc == EOK && node != NULL) {
224 bool destroy = (libfs_ops->lnkcnt_get(node) == 0);
225 libfs_ops->node_put(node);
226 if (destroy)
227 rc = vfs_out_ops->destroy(service_id, index);
228 }
229 async_answer_0(rid, rc);
230}
231
232static void vfs_out_open_node(ipc_callid_t rid, ipc_call_t *req)
233{
234 libfs_open_node(libfs_ops, reg.fs_handle, rid, req);
235}
236
237static void vfs_out_stat(ipc_callid_t rid, ipc_call_t *req)
238{
239 libfs_stat(libfs_ops, reg.fs_handle, rid, req);
240}
241
242static void vfs_out_sync(ipc_callid_t rid, ipc_call_t *req)
243{
244 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
245 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
246 errno_t rc;
247
248 rc = vfs_out_ops->sync(service_id, index);
249
250 async_answer_0(rid, rc);
251}
252
253static void vfs_out_statfs(ipc_callid_t rid, ipc_call_t *req)
254{
255 libfs_statfs(libfs_ops, reg.fs_handle, rid, req);
256}
257
258static void vfs_out_is_empty(ipc_callid_t rid, ipc_call_t *req)
259{
260 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
261 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
262 errno_t rc;
263
264 fs_node_t *node = NULL;
265 rc = libfs_ops->node_get(&node, service_id, index);
266 if (rc != EOK)
267 async_answer_0(rid, rc);
268 if (node == NULL)
269 async_answer_0(rid, EINVAL);
270
271 bool children = false;
272 rc = libfs_ops->has_children(&children, node);
273 libfs_ops->node_put(node);
274
275 if (rc != EOK)
276 async_answer_0(rid, rc);
277 async_answer_0(rid, children ? ENOTEMPTY : EOK);
278}
279
280static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
281{
282 if (iid) {
283 /*
284 * This only happens for connections opened by
285 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
286 * created by IPC_M_CONNECT_TO_ME.
287 */
288 async_answer_0(iid, EOK);
289 }
290
291 while (true) {
292 ipc_call_t call;
293 ipc_callid_t callid = async_get_call(&call);
294
295 if (!IPC_GET_IMETHOD(call))
296 return;
297
298 switch (IPC_GET_IMETHOD(call)) {
299 case VFS_OUT_FSPROBE:
300 vfs_out_fsprobe(callid, &call);
301 break;
302 case VFS_OUT_MOUNTED:
303 vfs_out_mounted(callid, &call);
304 break;
305 case VFS_OUT_UNMOUNTED:
306 vfs_out_unmounted(callid, &call);
307 break;
308 case VFS_OUT_LINK:
309 vfs_out_link(callid, &call);
310 break;
311 case VFS_OUT_LOOKUP:
312 vfs_out_lookup(callid, &call);
313 break;
314 case VFS_OUT_READ:
315 vfs_out_read(callid, &call);
316 break;
317 case VFS_OUT_WRITE:
318 vfs_out_write(callid, &call);
319 break;
320 case VFS_OUT_TRUNCATE:
321 vfs_out_truncate(callid, &call);
322 break;
323 case VFS_OUT_CLOSE:
324 vfs_out_close(callid, &call);
325 break;
326 case VFS_OUT_DESTROY:
327 vfs_out_destroy(callid, &call);
328 break;
329 case VFS_OUT_OPEN_NODE:
330 vfs_out_open_node(callid, &call);
331 break;
332 case VFS_OUT_STAT:
333 vfs_out_stat(callid, &call);
334 break;
335 case VFS_OUT_SYNC:
336 vfs_out_sync(callid, &call);
337 break;
338 case VFS_OUT_STATFS:
339 vfs_out_statfs(callid, &call);
340 break;
341 case VFS_OUT_IS_EMPTY:
342 vfs_out_is_empty(callid, &call);
343 break;
344 default:
345 async_answer_0(callid, ENOTSUP);
346 break;
347 }
348 }
349}
350
351/** Register file system server.
352 *
353 * This function abstracts away the tedious registration protocol from
354 * file system implementations and lets them to reuse this registration glue
355 * code.
356 *
357 * @param sess Session for communication with VFS.
358 * @param info VFS info structure supplied by the file system
359 * implementation.
360 * @param vops Address of the vfs_out_ops_t structure.
361 * @param lops Address of the libfs_ops_t structure.
362 *
363 * @return EOK on success or a non-zero error code on errror.
364 *
365 */
366errno_t fs_register(async_sess_t *sess, vfs_info_t *info, vfs_out_ops_t *vops,
367 libfs_ops_t *lops)
368{
369 /*
370 * Tell VFS that we are here and want to get registered.
371 * We use the async framework because VFS will answer the request
372 * out-of-order, when it knows that the operation succeeded or failed.
373 */
374
375 async_exch_t *exch = async_exchange_begin(sess);
376
377 ipc_call_t answer;
378 aid_t req = async_send_0(exch, VFS_IN_REGISTER, &answer);
379
380 /*
381 * Send our VFS info structure to VFS.
382 */
383 errno_t rc = async_data_write_start(exch, info, sizeof(*info));
384
385 if (rc != EOK) {
386 async_exchange_end(exch);
387 async_forget(req);
388 return rc;
389 }
390
391 /*
392 * Set VFS_OUT and libfs operations.
393 */
394 vfs_out_ops = vops;
395 libfs_ops = lops;
396
397 str_cpy(fs_name, sizeof(fs_name), info->name);
398
399 /*
400 * Ask VFS for callback connection.
401 */
402 port_id_t port;
403 rc = async_create_callback_port(exch, INTERFACE_VFS_DRIVER_CB, 0, 0,
404 vfs_connection, NULL, &port);
405
406 /*
407 * Request sharing the Path Lookup Buffer with VFS.
408 */
409 rc = async_share_in_start_0_0(exch, PLB_SIZE, (void *) &reg.plb_ro);
410 if (reg.plb_ro == AS_MAP_FAILED) {
411 async_exchange_end(exch);
412 async_forget(req);
413 return ENOMEM;
414 }
415
416 async_exchange_end(exch);
417
418 if (rc) {
419 async_forget(req);
420 return rc;
421 }
422
423 /*
424 * Pick up the answer for the request to the VFS_IN_REQUEST call.
425 */
426 async_wait_for(req, NULL);
427 reg.fs_handle = (int) IPC_GET_ARG1(answer);
428
429 /*
430 * Tell the async framework that other connections are to be handled by
431 * the same connection fibril as well.
432 */
433 async_set_fallback_port_handler(vfs_connection, NULL);
434
435 return IPC_GET_RETVAL(answer);
436}
437
438void fs_node_initialize(fs_node_t *fn)
439{
440 memset(fn, 0, sizeof(fs_node_t));
441}
442
443static char plb_get_char(unsigned pos)
444{
445 return reg.plb_ro[pos % PLB_SIZE];
446}
447
448static errno_t plb_get_component(char *dest, unsigned *sz, unsigned *ppos,
449 unsigned last)
450{
451 unsigned pos = *ppos;
452 unsigned size = 0;
453
454 if (pos == last) {
455 *sz = 0;
456 return ERANGE;
457 }
458
459 char c = plb_get_char(pos);
460 if (c == '/')
461 pos++;
462
463 for (int i = 0; i <= NAME_MAX; i++) {
464 c = plb_get_char(pos);
465 if (pos == last || c == '/') {
466 dest[i] = 0;
467 *ppos = pos;
468 *sz = size;
469 return EOK;
470 }
471 dest[i] = c;
472 pos++;
473 size++;
474 }
475 return ENAMETOOLONG;
476}
477
478static errno_t receive_fname(char *buffer)
479{
480 size_t size;
481 ipc_callid_t wcall;
482
483 if (!async_data_write_receive(&wcall, &size))
484 return ENOENT;
485 if (size > NAME_MAX + 1) {
486 async_answer_0(wcall, ERANGE);
487 return ERANGE;
488 }
489 return async_data_write_finalize(wcall, buffer, size);
490}
491
492/** Link a file at a path.
493 */
494void libfs_link(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
495 ipc_call_t *req)
496{
497 service_id_t parent_sid = IPC_GET_ARG1(*req);
498 fs_index_t parent_index = IPC_GET_ARG2(*req);
499 fs_index_t child_index = IPC_GET_ARG3(*req);
500
501 char component[NAME_MAX + 1];
502 errno_t rc = receive_fname(component);
503 if (rc != EOK) {
504 async_answer_0(rid, rc);
505 return;
506 }
507
508 fs_node_t *parent = NULL;
509 rc = ops->node_get(&parent, parent_sid, parent_index);
510 if (parent == NULL) {
511 async_answer_0(rid, rc == EOK ? EBADF : rc);
512 return;
513 }
514
515 fs_node_t *child = NULL;
516 rc = ops->node_get(&child, parent_sid, child_index);
517 if (child == NULL) {
518 async_answer_0(rid, rc == EOK ? EBADF : rc);
519 ops->node_put(parent);
520 return;
521 }
522
523 rc = ops->link(parent, child, component);
524 ops->node_put(parent);
525 ops->node_put(child);
526 async_answer_0(rid, rc);
527}
528
529/** Lookup VFS triplet by name in the file system name space.
530 *
531 * The path passed in the PLB must be in the canonical file system path format
532 * as returned by the canonify() function.
533 *
534 * @param ops libfs operations structure with function pointers to
535 * file system implementation
536 * @param fs_handle File system handle of the file system where to perform
537 * the lookup.
538 * @param rid Request ID of the VFS_OUT_LOOKUP request.
539 * @param request VFS_OUT_LOOKUP request data itself.
540 *
541 */
542void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
543 ipc_call_t *req)
544{
545 unsigned first = IPC_GET_ARG1(*req);
546 unsigned len = IPC_GET_ARG2(*req);
547 service_id_t service_id = IPC_GET_ARG3(*req);
548 fs_index_t index = IPC_GET_ARG4(*req);
549 int lflag = IPC_GET_ARG5(*req);
550
551 // TODO: Validate flags.
552
553 unsigned next = first;
554 unsigned last = first + len;
555
556 char component[NAME_MAX + 1];
557 errno_t rc;
558
559 fs_node_t *par = NULL;
560 fs_node_t *cur = NULL;
561 fs_node_t *tmp = NULL;
562 unsigned clen = 0;
563
564 rc = ops->node_get(&cur, service_id, index);
565 if (rc != EOK) {
566 async_answer_0(rid, rc);
567 goto out;
568 }
569
570 assert(cur != NULL);
571
572 /* Find the file and its parent. */
573
574 unsigned last_next = 0;
575
576 while (next != last) {
577 if (cur == NULL) {
578 assert(par != NULL);
579 goto out1;
580 }
581
582 if (!ops->is_directory(cur)) {
583 async_answer_0(rid, ENOTDIR);
584 goto out;
585 }
586
587 last_next = next;
588 /* Collect the component */
589 rc = plb_get_component(component, &clen, &next, last);
590 assert(rc != ERANGE);
591 if (rc != EOK) {
592 async_answer_0(rid, rc);
593 goto out;
594 }
595
596 if (clen == 0) {
597 /* The path is just "/". */
598 break;
599 }
600
601 assert(component[clen] == 0);
602
603 /* Match the component */
604 rc = ops->match(&tmp, cur, component);
605 if (rc != EOK) {
606 async_answer_0(rid, rc);
607 goto out;
608 }
609
610 /* Descend one level */
611 if (par) {
612 rc = ops->node_put(par);
613 if (rc != EOK) {
614 async_answer_0(rid, rc);
615 goto out;
616 }
617 }
618
619 par = cur;
620 cur = tmp;
621 tmp = NULL;
622 }
623
624 /* At this point, par is either NULL or a directory.
625 * If cur is NULL, the looked up file does not exist yet.
626 */
627
628 assert(par == NULL || ops->is_directory(par));
629 assert(par != NULL || cur != NULL);
630
631 /* Check for some error conditions. */
632
633 if (cur && (lflag & L_FILE) && (ops->is_directory(cur))) {
634 async_answer_0(rid, EISDIR);
635 goto out;
636 }
637
638 if (cur && (lflag & L_DIRECTORY) && (ops->is_file(cur))) {
639 async_answer_0(rid, ENOTDIR);
640 goto out;
641 }
642
643 /* Unlink. */
644
645 if (lflag & L_UNLINK) {
646 if (!cur) {
647 async_answer_0(rid, ENOENT);
648 goto out;
649 }
650 if (!par) {
651 async_answer_0(rid, EINVAL);
652 goto out;
653 }
654
655 rc = ops->unlink(par, cur, component);
656 if (rc == EOK) {
657 aoff64_t size = ops->size_get(cur);
658 async_answer_5(rid, EOK, fs_handle,
659 ops->index_get(cur),
660 (ops->is_directory(cur) << 16) | last,
661 LOWER32(size), UPPER32(size));
662 } else {
663 async_answer_0(rid, rc);
664 }
665 goto out;
666 }
667
668 /* Create. */
669
670 if (lflag & L_CREATE) {
671 if (cur && (lflag & L_EXCLUSIVE)) {
672 async_answer_0(rid, EEXIST);
673 goto out;
674 }
675
676 if (!cur) {
677 rc = ops->create(&cur, service_id,
678 lflag & (L_FILE | L_DIRECTORY));
679 if (rc != EOK) {
680 async_answer_0(rid, rc);
681 goto out;
682 }
683 if (!cur) {
684 async_answer_0(rid, ENOSPC);
685 goto out;
686 }
687
688 rc = ops->link(par, cur, component);
689 if (rc != EOK) {
690 (void) ops->destroy(cur);
691 cur = NULL;
692 async_answer_0(rid, rc);
693 goto out;
694 }
695 }
696 }
697
698 /* Return. */
699out1:
700 if (!cur) {
701 async_answer_5(rid, EOK, fs_handle, ops->index_get(par),
702 (ops->is_directory(par) << 16) | last_next,
703 LOWER32(ops->size_get(par)), UPPER32(ops->size_get(par)));
704 goto out;
705 }
706
707 async_answer_5(rid, EOK, fs_handle, ops->index_get(cur),
708 (ops->is_directory(cur) << 16) | last, LOWER32(ops->size_get(cur)),
709 UPPER32(ops->size_get(cur)));
710
711out:
712 if (par)
713 (void) ops->node_put(par);
714
715 if (cur)
716 (void) ops->node_put(cur);
717
718 if (tmp)
719 (void) ops->node_put(tmp);
720}
721
722void libfs_stat(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
723 ipc_call_t *request)
724{
725 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*request);
726 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
727
728 fs_node_t *fn;
729 errno_t rc = ops->node_get(&fn, service_id, index);
730 on_error(rc, answer_and_return(rid, rc));
731
732 ipc_callid_t callid;
733 size_t size;
734 if ((!async_data_read_receive(&callid, &size)) ||
735 (size != sizeof(vfs_stat_t))) {
736 ops->node_put(fn);
737 async_answer_0(callid, EINVAL);
738 async_answer_0(rid, EINVAL);
739 return;
740 }
741
742 vfs_stat_t stat;
743 memset(&stat, 0, sizeof(vfs_stat_t));
744
745 stat.fs_handle = fs_handle;
746 stat.service_id = service_id;
747 stat.index = index;
748 stat.lnkcnt = ops->lnkcnt_get(fn);
749 stat.is_file = ops->is_file(fn);
750 stat.is_directory = ops->is_directory(fn);
751 stat.size = ops->size_get(fn);
752 stat.service = ops->service_get(fn);
753
754 ops->node_put(fn);
755
756
757 async_data_read_finalize(callid, &stat, sizeof(vfs_stat_t));
758 async_answer_0(rid, EOK);
759}
760
761void libfs_statfs(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
762 ipc_call_t *request)
763{
764 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*request);
765 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
766
767 fs_node_t *fn;
768 errno_t rc = ops->node_get(&fn, service_id, index);
769 on_error(rc, answer_and_return(rid, rc));
770
771 ipc_callid_t callid;
772 size_t size;
773 if ((!async_data_read_receive(&callid, &size)) ||
774 (size != sizeof(vfs_statfs_t))) {
775 goto error;
776 }
777
778 vfs_statfs_t st;
779 memset(&st, 0, sizeof(vfs_statfs_t));
780
781 str_cpy(st.fs_name, sizeof(st.fs_name), fs_name);
782
783 if (ops->size_block != NULL) {
784 rc = ops->size_block(service_id, &st.f_bsize);
785 if (rc != EOK)
786 goto error;
787 }
788
789 if (ops->total_block_count != NULL) {
790 rc = ops->total_block_count(service_id, &st.f_blocks);
791 if (rc != EOK)
792 goto error;
793 }
794
795 if (ops->free_block_count != NULL) {
796 rc = ops->free_block_count(service_id, &st.f_bfree);
797 if (rc != EOK)
798 goto error;
799 }
800
801 ops->node_put(fn);
802 async_data_read_finalize(callid, &st, sizeof(vfs_statfs_t));
803 async_answer_0(rid, EOK);
804 return;
805
806error:
807 ops->node_put(fn);
808 async_answer_0(callid, EINVAL);
809 async_answer_0(rid, EINVAL);
810}
811
812
813/** Open VFS triplet.
814 *
815 * @param ops libfs operations structure with function pointers to
816 * file system implementation
817 * @param rid Request ID of the VFS_OUT_OPEN_NODE request.
818 * @param request VFS_OUT_OPEN_NODE request data itself.
819 *
820 */
821void libfs_open_node(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
822 ipc_call_t *request)
823{
824 service_id_t service_id = IPC_GET_ARG1(*request);
825 fs_index_t index = IPC_GET_ARG2(*request);
826
827 fs_node_t *fn;
828 errno_t rc = ops->node_get(&fn, service_id, index);
829 on_error(rc, answer_and_return(rid, rc));
830
831 if (fn == NULL) {
832 async_answer_0(rid, ENOENT);
833 return;
834 }
835
836 rc = ops->node_open(fn);
837 aoff64_t size = ops->size_get(fn);
838 async_answer_4(rid, rc, LOWER32(size), UPPER32(size),
839 ops->lnkcnt_get(fn),
840 (ops->is_file(fn) ? L_FILE : 0) |
841 (ops->is_directory(fn) ? L_DIRECTORY : 0));
842
843 (void) ops->node_put(fn);
844}
845
846static FIBRIL_MUTEX_INITIALIZE(instances_mutex);
847static LIST_INITIALIZE(instances_list);
848
849typedef struct {
850 service_id_t service_id;
851 link_t link;
852 void *data;
853} fs_instance_t;
854
855errno_t fs_instance_create(service_id_t service_id, void *data)
856{
857 fs_instance_t *inst = malloc(sizeof(fs_instance_t));
858 if (!inst)
859 return ENOMEM;
860
861 link_initialize(&inst->link);
862 inst->service_id = service_id;
863 inst->data = data;
864
865 fibril_mutex_lock(&instances_mutex);
866 list_foreach(instances_list, link, fs_instance_t, cur) {
867 if (cur->service_id == service_id) {
868 fibril_mutex_unlock(&instances_mutex);
869 free(inst);
870 return EEXIST;
871 }
872
873 /* keep the list sorted */
874 if (cur->service_id < service_id) {
875 list_insert_before(&inst->link, &cur->link);
876 fibril_mutex_unlock(&instances_mutex);
877 return EOK;
878 }
879 }
880 list_append(&inst->link, &instances_list);
881 fibril_mutex_unlock(&instances_mutex);
882
883 return EOK;
884}
885
886errno_t fs_instance_get(service_id_t service_id, void **idp)
887{
888 fibril_mutex_lock(&instances_mutex);
889 list_foreach(instances_list, link, fs_instance_t, inst) {
890 if (inst->service_id == service_id) {
891 *idp = inst->data;
892 fibril_mutex_unlock(&instances_mutex);
893 return EOK;
894 }
895 }
896 fibril_mutex_unlock(&instances_mutex);
897 return ENOENT;
898}
899
900errno_t fs_instance_destroy(service_id_t service_id)
901{
902 fibril_mutex_lock(&instances_mutex);
903 list_foreach(instances_list, link, fs_instance_t, inst) {
904 if (inst->service_id == service_id) {
905 list_remove(&inst->link);
906 fibril_mutex_unlock(&instances_mutex);
907 free(inst);
908 return EOK;
909 }
910 }
911 fibril_mutex_unlock(&instances_mutex);
912 return ENOENT;
913}
914
915/** @}
916 */
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