source: mainline/uspace/lib/fs/libfs.c@ 5bf76c1

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 5bf76c1 was 5bf76c1, checked in by Jakub Jermar <jakub@…>, 14 years ago

Move the fs instance managing logic out of mfs to libfs.
  • Property mode set to 100644
File size: 23.1 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 "../../srv/vfs/vfs.h"
39#include <macros.h>
40#include <errno.h>
41#include <async.h>
42#include <as.h>
43#include <assert.h>
44#include <dirent.h>
45#include <mem.h>
46#include <sys/stat.h>
47#include <stdlib.h>
48
49#define on_error(rc, action) \
50 do { \
51 if ((rc) != EOK) \
52 action; \
53 } while (0)
54
55#define combine_rc(rc1, rc2) \
56 ((rc1) == EOK ? (rc2) : (rc1))
57
58#define answer_and_return(rid, rc) \
59 do { \
60 async_answer_0((rid), (rc)); \
61 return; \
62 } while (0)
63
64static fs_reg_t reg;
65
66static vfs_out_ops_t *vfs_out_ops = NULL;
67static libfs_ops_t *libfs_ops = NULL;
68
69static void libfs_mount(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
70static void libfs_unmount(libfs_ops_t *, ipc_callid_t, ipc_call_t *);
71static void libfs_lookup(libfs_ops_t *, fs_handle_t, ipc_callid_t,
72 ipc_call_t *);
73static void libfs_stat(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
74static void libfs_open_node(libfs_ops_t *, fs_handle_t, ipc_callid_t,
75 ipc_call_t *);
76
77static void vfs_out_mounted(ipc_callid_t rid, ipc_call_t *req)
78{
79 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
80 char *opts;
81 int rc;
82
83 /* Accept the mount options. */
84 rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
85 if (rc != EOK) {
86 async_answer_0(rid, rc);
87 return;
88 }
89
90 fs_index_t index;
91 aoff64_t size;
92 unsigned lnkcnt;
93 rc = vfs_out_ops->mounted(service_id, opts, &index, &size, &lnkcnt);
94
95 if (rc == EOK)
96 async_answer_4(rid, EOK, index, LOWER32(size), UPPER32(size),
97 lnkcnt);
98 else
99 async_answer_0(rid, rc);
100
101 free(opts);
102}
103
104static void vfs_out_mount(ipc_callid_t rid, ipc_call_t *req)
105{
106 libfs_mount(libfs_ops, reg.fs_handle, rid, req);
107}
108
109static void vfs_out_unmounted(ipc_callid_t rid, ipc_call_t *req)
110{
111 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
112 int rc;
113
114 rc = vfs_out_ops->unmounted(service_id);
115
116 async_answer_0(rid, rc);
117}
118
119static void vfs_out_unmount(ipc_callid_t rid, ipc_call_t *req)
120{
121
122 libfs_unmount(libfs_ops, rid, req);
123}
124
125static void vfs_out_lookup(ipc_callid_t rid, ipc_call_t *req)
126{
127 libfs_lookup(libfs_ops, reg.fs_handle, rid, req);
128}
129
130static void vfs_out_read(ipc_callid_t rid, ipc_call_t *req)
131{
132 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
133 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
134 aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
135 IPC_GET_ARG4(*req));
136 size_t rbytes;
137 int rc;
138
139 rc = vfs_out_ops->read(service_id, index, pos, &rbytes);
140
141 if (rc == EOK)
142 async_answer_1(rid, EOK, rbytes);
143 else
144 async_answer_0(rid, rc);
145}
146
147static void vfs_out_write(ipc_callid_t rid, ipc_call_t *req)
148{
149 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
150 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
151 aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
152 IPC_GET_ARG4(*req));
153 size_t wbytes;
154 aoff64_t nsize;
155 int rc;
156
157 rc = vfs_out_ops->write(service_id, index, pos, &wbytes, &nsize);
158
159 if (rc == EOK)
160 async_answer_3(rid, EOK, wbytes, LOWER32(nsize), UPPER32(nsize));
161 else
162 async_answer_0(rid, rc);
163}
164
165static void vfs_out_truncate(ipc_callid_t rid, ipc_call_t *req)
166{
167 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
168 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
169 aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req),
170 IPC_GET_ARG4(*req));
171 int rc;
172
173 rc = vfs_out_ops->truncate(service_id, index, size);
174
175 async_answer_0(rid, rc);
176}
177
178static void vfs_out_close(ipc_callid_t rid, ipc_call_t *req)
179{
180 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
181 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
182 int rc;
183
184 rc = vfs_out_ops->close(service_id, index);
185
186 async_answer_0(rid, rc);
187}
188
189static void vfs_out_destroy(ipc_callid_t rid, ipc_call_t *req)
190{
191 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
192 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
193 int rc;
194
195 rc = vfs_out_ops->destroy(service_id, index);
196
197 async_answer_0(rid, rc);
198}
199
200static void vfs_out_open_node(ipc_callid_t rid, ipc_call_t *req)
201{
202 libfs_open_node(libfs_ops, reg.fs_handle, rid, req);
203}
204
205static void vfs_out_stat(ipc_callid_t rid, ipc_call_t *req)
206{
207 libfs_stat(libfs_ops, reg.fs_handle, rid, req);
208}
209
210static void vfs_out_sync(ipc_callid_t rid, ipc_call_t *req)
211{
212 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req);
213 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req);
214 int rc;
215
216 rc = vfs_out_ops->sync(service_id, index);
217
218 async_answer_0(rid, rc);
219}
220
221static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
222{
223 if (iid) {
224 /*
225 * This only happens for connections opened by
226 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
227 * created by IPC_M_CONNECT_TO_ME.
228 */
229 async_answer_0(iid, EOK);
230 }
231
232 while (true) {
233 ipc_call_t call;
234 ipc_callid_t callid = async_get_call(&call);
235
236 if (!IPC_GET_IMETHOD(call))
237 return;
238
239 switch (IPC_GET_IMETHOD(call)) {
240 case VFS_OUT_MOUNTED:
241 vfs_out_mounted(callid, &call);
242 break;
243 case VFS_OUT_MOUNT:
244 vfs_out_mount(callid, &call);
245 break;
246 case VFS_OUT_UNMOUNTED:
247 vfs_out_unmounted(callid, &call);
248 break;
249 case VFS_OUT_UNMOUNT:
250 vfs_out_unmount(callid, &call);
251 break;
252 case VFS_OUT_LOOKUP:
253 vfs_out_lookup(callid, &call);
254 break;
255 case VFS_OUT_READ:
256 vfs_out_read(callid, &call);
257 break;
258 case VFS_OUT_WRITE:
259 vfs_out_write(callid, &call);
260 break;
261 case VFS_OUT_TRUNCATE:
262 vfs_out_truncate(callid, &call);
263 break;
264 case VFS_OUT_CLOSE:
265 vfs_out_close(callid, &call);
266 break;
267 case VFS_OUT_DESTROY:
268 vfs_out_destroy(callid, &call);
269 break;
270 case VFS_OUT_OPEN_NODE:
271 vfs_out_open_node(callid, &call);
272 break;
273 case VFS_OUT_STAT:
274 vfs_out_stat(callid, &call);
275 break;
276 case VFS_OUT_SYNC:
277 vfs_out_sync(callid, &call);
278 break;
279 default:
280 async_answer_0(callid, ENOTSUP);
281 break;
282 }
283 }
284}
285
286/** Register file system server.
287 *
288 * This function abstracts away the tedious registration protocol from
289 * file system implementations and lets them to reuse this registration glue
290 * code.
291 *
292 * @param sess Session for communication with VFS.
293 * @param info VFS info structure supplied by the file system
294 * implementation.
295 * @param vops Address of the vfs_out_ops_t structure.
296 * @param lops Address of the libfs_ops_t structure.
297 *
298 * @return EOK on success or a non-zero error code on errror.
299 *
300 */
301int fs_register(async_sess_t *sess, vfs_info_t *info, vfs_out_ops_t *vops,
302 libfs_ops_t *lops)
303{
304 /*
305 * Tell VFS that we are here and want to get registered.
306 * We use the async framework because VFS will answer the request
307 * out-of-order, when it knows that the operation succeeded or failed.
308 */
309
310 async_exch_t *exch = async_exchange_begin(sess);
311
312 ipc_call_t answer;
313 aid_t req = async_send_0(exch, VFS_IN_REGISTER, &answer);
314
315 /*
316 * Send our VFS info structure to VFS.
317 */
318 int rc = async_data_write_start(exch, info, sizeof(*info));
319
320 if (rc != EOK) {
321 async_exchange_end(exch);
322 async_wait_for(req, NULL);
323 return rc;
324 }
325
326 /*
327 * Set VFS_OUT and libfs operations.
328 */
329 vfs_out_ops = vops;
330 libfs_ops = lops;
331
332 /*
333 * Ask VFS for callback connection.
334 */
335 async_connect_to_me(exch, 0, 0, 0, vfs_connection, NULL);
336
337 /*
338 * Allocate piece of address space for PLB.
339 */
340 reg.plb_ro = as_get_mappable_page(PLB_SIZE);
341 if (!reg.plb_ro) {
342 async_exchange_end(exch);
343 async_wait_for(req, NULL);
344 return ENOMEM;
345 }
346
347 /*
348 * Request sharing the Path Lookup Buffer with VFS.
349 */
350 rc = async_share_in_start_0_0(exch, reg.plb_ro, PLB_SIZE);
351
352 async_exchange_end(exch);
353
354 if (rc) {
355 async_wait_for(req, NULL);
356 return rc;
357 }
358
359 /*
360 * Pick up the answer for the request to the VFS_IN_REQUEST call.
361 */
362 async_wait_for(req, NULL);
363 reg.fs_handle = (int) IPC_GET_ARG1(answer);
364
365 /*
366 * Tell the async framework that other connections are to be handled by
367 * the same connection fibril as well.
368 */
369 async_set_client_connection(vfs_connection);
370
371 return IPC_GET_RETVAL(answer);
372}
373
374void fs_node_initialize(fs_node_t *fn)
375{
376 memset(fn, 0, sizeof(fs_node_t));
377}
378
379void libfs_mount(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
380 ipc_call_t *req)
381{
382 service_id_t mp_service_id = (service_id_t) IPC_GET_ARG1(*req);
383 fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*req);
384 fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*req);
385 service_id_t mr_service_id = (service_id_t) IPC_GET_ARG4(*req);
386
387 async_sess_t *mountee_sess = async_clone_receive(EXCHANGE_PARALLEL);
388 if (mountee_sess == NULL) {
389 async_answer_0(rid, EINVAL);
390 return;
391 }
392
393 fs_node_t *fn;
394 int res = ops->node_get(&fn, mp_service_id, mp_fs_index);
395 if ((res != EOK) || (!fn)) {
396 async_hangup(mountee_sess);
397 async_data_write_void(combine_rc(res, ENOENT));
398 async_answer_0(rid, combine_rc(res, ENOENT));
399 return;
400 }
401
402 if (fn->mp_data.mp_active) {
403 async_hangup(mountee_sess);
404 (void) ops->node_put(fn);
405 async_data_write_void(EBUSY);
406 async_answer_0(rid, EBUSY);
407 return;
408 }
409
410 async_exch_t *exch = async_exchange_begin(mountee_sess);
411 async_sess_t *sess = async_connect_me(EXCHANGE_PARALLEL, exch);
412
413 if (!sess) {
414 async_exchange_end(exch);
415 async_hangup(mountee_sess);
416 (void) ops->node_put(fn);
417 async_data_write_void(errno);
418 async_answer_0(rid, errno);
419 return;
420 }
421
422 ipc_call_t answer;
423 int rc = async_data_write_forward_1_1(exch, VFS_OUT_MOUNTED,
424 mr_service_id, &answer);
425 async_exchange_end(exch);
426
427 if (rc == EOK) {
428 fn->mp_data.mp_active = true;
429 fn->mp_data.fs_handle = mr_fs_handle;
430 fn->mp_data.service_id = mr_service_id;
431 fn->mp_data.sess = mountee_sess;
432 }
433
434 /*
435 * Do not release the FS node so that it stays in memory.
436 */
437 async_answer_4(rid, rc, IPC_GET_ARG1(answer), IPC_GET_ARG2(answer),
438 IPC_GET_ARG3(answer), IPC_GET_ARG4(answer));
439}
440
441void libfs_unmount(libfs_ops_t *ops, ipc_callid_t rid, ipc_call_t *req)
442{
443 service_id_t mp_service_id = (service_id_t) IPC_GET_ARG1(*req);
444 fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*req);
445 fs_node_t *fn;
446 int res;
447
448 res = ops->node_get(&fn, mp_service_id, mp_fs_index);
449 if ((res != EOK) || (!fn)) {
450 async_answer_0(rid, combine_rc(res, ENOENT));
451 return;
452 }
453
454 /*
455 * We are clearly expecting to find the mount point active.
456 */
457 if (!fn->mp_data.mp_active) {
458 (void) ops->node_put(fn);
459 async_answer_0(rid, EINVAL);
460 return;
461 }
462
463 /*
464 * Tell the mounted file system to unmount.
465 */
466 async_exch_t *exch = async_exchange_begin(fn->mp_data.sess);
467 res = async_req_1_0(exch, VFS_OUT_UNMOUNTED, fn->mp_data.service_id);
468 async_exchange_end(exch);
469
470 /*
471 * If everything went well, perform the clean-up on our side.
472 */
473 if (res == EOK) {
474 async_hangup(fn->mp_data.sess);
475 fn->mp_data.mp_active = false;
476 fn->mp_data.fs_handle = 0;
477 fn->mp_data.service_id = 0;
478 fn->mp_data.sess = NULL;
479
480 /* Drop the reference created in libfs_mount(). */
481 (void) ops->node_put(fn);
482 }
483
484 (void) ops->node_put(fn);
485 async_answer_0(rid, res);
486}
487
488static char plb_get_char(unsigned pos)
489{
490 return reg.plb_ro[pos % PLB_SIZE];
491}
492
493/** Lookup VFS triplet by name in the file system name space.
494 *
495 * The path passed in the PLB must be in the canonical file system path format
496 * as returned by the canonify() function.
497 *
498 * @param ops libfs operations structure with function pointers to
499 * file system implementation
500 * @param fs_handle File system handle of the file system where to perform
501 * the lookup.
502 * @param rid Request ID of the VFS_OUT_LOOKUP request.
503 * @param request VFS_OUT_LOOKUP request data itself.
504 *
505 */
506void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
507 ipc_call_t *req)
508{
509 unsigned int first = IPC_GET_ARG1(*req);
510 unsigned int last = IPC_GET_ARG2(*req);
511 unsigned int next = first;
512 service_id_t service_id = IPC_GET_ARG3(*req);
513 int lflag = IPC_GET_ARG4(*req);
514 fs_index_t index = IPC_GET_ARG5(*req);
515 char component[NAME_MAX + 1];
516 int len;
517 int rc;
518
519 if (last < next)
520 last += PLB_SIZE;
521
522 fs_node_t *par = NULL;
523 fs_node_t *cur = NULL;
524 fs_node_t *tmp = NULL;
525
526 rc = ops->root_get(&cur, service_id);
527 on_error(rc, goto out_with_answer);
528
529 if (cur->mp_data.mp_active) {
530 async_exch_t *exch = async_exchange_begin(cur->mp_data.sess);
531 async_forward_slow(rid, exch, VFS_OUT_LOOKUP, next, last,
532 cur->mp_data.service_id, lflag, index,
533 IPC_FF_ROUTE_FROM_ME);
534 async_exchange_end(exch);
535
536 (void) ops->node_put(cur);
537 return;
538 }
539
540 /* Eat slash */
541 if (plb_get_char(next) == '/')
542 next++;
543
544 while (next <= last) {
545 bool has_children;
546
547 rc = ops->has_children(&has_children, cur);
548 on_error(rc, goto out_with_answer);
549 if (!has_children)
550 break;
551
552 /* Collect the component */
553 len = 0;
554 while ((next <= last) && (plb_get_char(next) != '/')) {
555 if (len + 1 == NAME_MAX) {
556 /* Component length overflow */
557 async_answer_0(rid, ENAMETOOLONG);
558 goto out;
559 }
560 component[len++] = plb_get_char(next);
561 /* Process next character */
562 next++;
563 }
564
565 assert(len);
566 component[len] = '\0';
567 /* Eat slash */
568 next++;
569
570 /* Match the component */
571 rc = ops->match(&tmp, cur, component);
572 on_error(rc, goto out_with_answer);
573
574 /*
575 * If the matching component is a mount point, there are two
576 * legitimate semantics of the lookup operation. The first is
577 * the commonly used one in which the lookup crosses each mount
578 * point into the mounted file system. The second semantics is
579 * used mostly during unmount() and differs from the first one
580 * only in that the last mount point in the looked up path,
581 * which is also its last component, is not crossed.
582 */
583
584 if ((tmp) && (tmp->mp_data.mp_active) &&
585 (!(lflag & L_MP) || (next <= last))) {
586 if (next > last)
587 next = last = first;
588 else
589 next--;
590
591 async_exch_t *exch = async_exchange_begin(tmp->mp_data.sess);
592 async_forward_slow(rid, exch, VFS_OUT_LOOKUP, next,
593 last, tmp->mp_data.service_id, lflag, index,
594 IPC_FF_ROUTE_FROM_ME);
595 async_exchange_end(exch);
596
597 (void) ops->node_put(cur);
598 (void) ops->node_put(tmp);
599 if (par)
600 (void) ops->node_put(par);
601 return;
602 }
603
604 /* Handle miss: match amongst siblings */
605 if (!tmp) {
606 if (next <= last) {
607 /* There are unprocessed components */
608 async_answer_0(rid, ENOENT);
609 goto out;
610 }
611
612 /* Miss in the last component */
613 if (lflag & (L_CREATE | L_LINK)) {
614 /* Request to create a new link */
615 if (!ops->is_directory(cur)) {
616 async_answer_0(rid, ENOTDIR);
617 goto out;
618 }
619
620 fs_node_t *fn;
621 if (lflag & L_CREATE)
622 rc = ops->create(&fn, service_id,
623 lflag);
624 else
625 rc = ops->node_get(&fn, service_id,
626 index);
627 on_error(rc, goto out_with_answer);
628
629 if (fn) {
630 rc = ops->link(cur, fn, component);
631 if (rc != EOK) {
632 if (lflag & L_CREATE)
633 (void) ops->destroy(fn);
634 else
635 (void) ops->node_put(fn);
636 async_answer_0(rid, rc);
637 } else {
638 aoff64_t size = ops->size_get(fn);
639 async_answer_5(rid, fs_handle,
640 service_id,
641 ops->index_get(fn),
642 LOWER32(size),
643 UPPER32(size),
644 ops->lnkcnt_get(fn));
645 (void) ops->node_put(fn);
646 }
647 } else
648 async_answer_0(rid, ENOSPC);
649
650 goto out;
651 }
652
653 async_answer_0(rid, ENOENT);
654 goto out;
655 }
656
657 if (par) {
658 rc = ops->node_put(par);
659 on_error(rc, goto out_with_answer);
660 }
661
662 /* Descend one level */
663 par = cur;
664 cur = tmp;
665 tmp = NULL;
666 }
667
668 /* Handle miss: excessive components */
669 if (next <= last) {
670 bool has_children;
671 rc = ops->has_children(&has_children, cur);
672 on_error(rc, goto out_with_answer);
673
674 if (has_children)
675 goto skip_miss;
676
677 if (lflag & (L_CREATE | L_LINK)) {
678 if (!ops->is_directory(cur)) {
679 async_answer_0(rid, ENOTDIR);
680 goto out;
681 }
682
683 /* Collect next component */
684 len = 0;
685 while (next <= last) {
686 if (plb_get_char(next) == '/') {
687 /* More than one component */
688 async_answer_0(rid, ENOENT);
689 goto out;
690 }
691
692 if (len + 1 == NAME_MAX) {
693 /* Component length overflow */
694 async_answer_0(rid, ENAMETOOLONG);
695 goto out;
696 }
697
698 component[len++] = plb_get_char(next);
699 /* Process next character */
700 next++;
701 }
702
703 assert(len);
704 component[len] = '\0';
705
706 fs_node_t *fn;
707 if (lflag & L_CREATE)
708 rc = ops->create(&fn, service_id, lflag);
709 else
710 rc = ops->node_get(&fn, service_id, index);
711 on_error(rc, goto out_with_answer);
712
713 if (fn) {
714 rc = ops->link(cur, fn, component);
715 if (rc != EOK) {
716 if (lflag & L_CREATE)
717 (void) ops->destroy(fn);
718 else
719 (void) ops->node_put(fn);
720 async_answer_0(rid, rc);
721 } else {
722 aoff64_t size = ops->size_get(fn);
723 async_answer_5(rid, fs_handle,
724 service_id,
725 ops->index_get(fn),
726 LOWER32(size),
727 UPPER32(size),
728 ops->lnkcnt_get(fn));
729 (void) ops->node_put(fn);
730 }
731 } else
732 async_answer_0(rid, ENOSPC);
733
734 goto out;
735 }
736
737 async_answer_0(rid, ENOENT);
738 goto out;
739 }
740
741skip_miss:
742
743 /* Handle hit */
744 if (lflag & L_UNLINK) {
745 unsigned int old_lnkcnt = ops->lnkcnt_get(cur);
746 rc = ops->unlink(par, cur, component);
747
748 if (rc == EOK) {
749 aoff64_t size = ops->size_get(cur);
750 async_answer_5(rid, fs_handle, service_id,
751 ops->index_get(cur), LOWER32(size), UPPER32(size),
752 old_lnkcnt);
753 } else
754 async_answer_0(rid, rc);
755
756 goto out;
757 }
758
759 if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) ||
760 (lflag & L_LINK)) {
761 async_answer_0(rid, EEXIST);
762 goto out;
763 }
764
765 if ((lflag & L_FILE) && (ops->is_directory(cur))) {
766 async_answer_0(rid, EISDIR);
767 goto out;
768 }
769
770 if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) {
771 async_answer_0(rid, ENOTDIR);
772 goto out;
773 }
774
775 if ((lflag & L_ROOT) && par) {
776 async_answer_0(rid, EINVAL);
777 goto out;
778 }
779
780out_with_answer:
781
782 if (rc == EOK) {
783 if (lflag & L_OPEN)
784 rc = ops->node_open(cur);
785
786 if (rc == EOK) {
787 aoff64_t size = ops->size_get(cur);
788 async_answer_5(rid, fs_handle, service_id,
789 ops->index_get(cur), LOWER32(size), UPPER32(size),
790 ops->lnkcnt_get(cur));
791 } else
792 async_answer_0(rid, rc);
793
794 } else
795 async_answer_0(rid, rc);
796
797out:
798
799 if (par)
800 (void) ops->node_put(par);
801
802 if (cur)
803 (void) ops->node_put(cur);
804
805 if (tmp)
806 (void) ops->node_put(tmp);
807}
808
809void libfs_stat(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
810 ipc_call_t *request)
811{
812 service_id_t service_id = (service_id_t) IPC_GET_ARG1(*request);
813 fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
814
815 fs_node_t *fn;
816 int rc = ops->node_get(&fn, service_id, index);
817 on_error(rc, answer_and_return(rid, rc));
818
819 ipc_callid_t callid;
820 size_t size;
821 if ((!async_data_read_receive(&callid, &size)) ||
822 (size != sizeof(struct stat))) {
823 ops->node_put(fn);
824 async_answer_0(callid, EINVAL);
825 async_answer_0(rid, EINVAL);
826 return;
827 }
828
829 struct stat stat;
830 memset(&stat, 0, sizeof(struct stat));
831
832 stat.fs_handle = fs_handle;
833 stat.service_id = service_id;
834 stat.index = index;
835 stat.lnkcnt = ops->lnkcnt_get(fn);
836 stat.is_file = ops->is_file(fn);
837 stat.is_directory = ops->is_directory(fn);
838 stat.size = ops->size_get(fn);
839 stat.service = ops->service_get(fn);
840
841 ops->node_put(fn);
842
843 async_data_read_finalize(callid, &stat, sizeof(struct stat));
844 async_answer_0(rid, EOK);
845}
846
847/** Open VFS triplet.
848 *
849 * @param ops libfs operations structure with function pointers to
850 * file system implementation
851 * @param rid Request ID of the VFS_OUT_OPEN_NODE request.
852 * @param request VFS_OUT_OPEN_NODE request data itself.
853 *
854 */
855void libfs_open_node(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
856 ipc_call_t *request)
857{
858 service_id_t service_id = IPC_GET_ARG1(*request);
859 fs_index_t index = IPC_GET_ARG2(*request);
860
861 fs_node_t *fn;
862 int rc = ops->node_get(&fn, service_id, index);
863 on_error(rc, answer_and_return(rid, rc));
864
865 if (fn == NULL) {
866 async_answer_0(rid, ENOENT);
867 return;
868 }
869
870 rc = ops->node_open(fn);
871 aoff64_t size = ops->size_get(fn);
872 async_answer_4(rid, rc, LOWER32(size), UPPER32(size),
873 ops->lnkcnt_get(fn),
874 (ops->is_file(fn) ? L_FILE : 0) | (ops->is_directory(fn) ? L_DIRECTORY : 0));
875
876 (void) ops->node_put(fn);
877}
878
879static FIBRIL_MUTEX_INITIALIZE(instances_mutex);
880static LIST_INITIALIZE(instances_list);
881
882typedef struct {
883 service_id_t service_id;
884 link_t link;
885 void *data;
886} fs_instance_t;
887
888int fs_instance_create(service_id_t service_id, void *data)
889{
890 fs_instance_t *inst = malloc(sizeof(fs_instance_t));
891 if (!inst)
892 return ENOMEM;
893
894 link_initialize(&inst->link);
895 inst->service_id = service_id;
896 inst->data = data;
897
898 fibril_mutex_lock(&instances_mutex);
899 list_foreach(instances_list, link) {
900 fs_instance_t *cur = list_get_instance(link, fs_instance_t,
901 link);
902
903 if (cur->service_id == service_id) {
904 fibril_mutex_unlock(&instances_mutex);
905 free(inst);
906 return EEXIST;
907 }
908
909 /* keep the list sorted */
910 if (cur->service_id < service_id) {
911 list_insert_before(&inst->link, &cur->link);
912 fibril_mutex_unlock(&instances_mutex);
913 return EOK;
914 }
915 }
916 list_append(&inst->link, &instances_list);
917 fibril_mutex_unlock(&instances_mutex);
918
919 return EOK;
920}
921
922int fs_instance_get(service_id_t service_id, void **idp)
923{
924 fibril_mutex_lock(&instances_mutex);
925 list_foreach(instances_list, link) {
926 fs_instance_t *inst = list_get_instance(link, fs_instance_t,
927 link);
928
929 if (inst->service_id == service_id) {
930 *idp = inst->data;
931 fibril_mutex_unlock(&instances_mutex);
932 return EOK;
933 }
934 }
935 fibril_mutex_unlock(&instances_mutex);
936 return ENOENT;
937}
938
939int fs_instance_destroy(service_id_t service_id)
940{
941 fibril_mutex_lock(&instances_mutex);
942 list_foreach(instances_list, link) {
943 fs_instance_t *inst = list_get_instance(link, fs_instance_t,
944 link);
945
946 if (inst->service_id == service_id) {
947 list_remove(&inst->link);
948 fibril_mutex_unlock(&instances_mutex);
949 free(inst);
950 return EOK;
951 }
952 }
953 fibril_mutex_unlock(&instances_mutex);
954 return ENOENT;
955}
956
957/** @}
958 */
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