source: mainline/uspace/lib/libc/generic/vfs/vfs.c@ 4198f9c3

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 4198f9c3 was 4198f9c3, checked in by Jakub Jermar <jakub@…>, 16 years ago

Separate the VFS input and output protocols.
  • Property mode set to 100644
File size: 12.4 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 libc
30 * @{
31 */
32/** @file
33 */
34
35#include <vfs/vfs.h>
36#include <vfs/canonify.h>
37#include <stdlib.h>
38#include <unistd.h>
39#include <dirent.h>
40#include <fcntl.h>
41#include <sys/stat.h>
42#include <stdio.h>
43#include <sys/types.h>
44#include <ipc/ipc.h>
45#include <ipc/services.h>
46#include <async.h>
47#include <atomic.h>
48#include <futex.h>
49#include <errno.h>
50#include <string.h>
51#include <devmap.h>
52#include <ipc/vfs.h>
53#include <ipc/devmap.h>
54
55static int vfs_phone = -1;
56static futex_t vfs_phone_futex = FUTEX_INITIALIZER;
57static futex_t cwd_futex = FUTEX_INITIALIZER;
58
59DIR *cwd_dir = NULL;
60char *cwd_path = NULL;
61size_t cwd_size = 0;
62
63char *absolutize(const char *path, size_t *retlen)
64{
65 char *ncwd_path;
66 char *ncwd_path_nc;
67
68 futex_down(&cwd_futex);
69 size_t size = str_size(path);
70 if (*path != '/') {
71 if (!cwd_path) {
72 futex_up(&cwd_futex);
73 return NULL;
74 }
75 ncwd_path_nc = malloc(cwd_size + 1 + size + 1);
76 if (!ncwd_path_nc) {
77 futex_up(&cwd_futex);
78 return NULL;
79 }
80 str_cpy(ncwd_path_nc, cwd_size + 1 + size + 1, cwd_path);
81 ncwd_path_nc[cwd_size] = '/';
82 ncwd_path_nc[cwd_size + 1] = '\0';
83 } else {
84 ncwd_path_nc = malloc(size + 1);
85 if (!ncwd_path_nc) {
86 futex_up(&cwd_futex);
87 return NULL;
88 }
89 ncwd_path_nc[0] = '\0';
90 }
91 str_append(ncwd_path_nc, cwd_size + 1 + size + 1, path);
92 ncwd_path = canonify(ncwd_path_nc, retlen);
93 if (!ncwd_path) {
94 futex_up(&cwd_futex);
95 free(ncwd_path_nc);
96 return NULL;
97 }
98 /*
99 * We need to clone ncwd_path because canonify() works in-place and thus
100 * the address in ncwd_path need not be the same as ncwd_path_nc, even
101 * though they both point into the same dynamically allocated buffer.
102 */
103 ncwd_path = str_dup(ncwd_path);
104 free(ncwd_path_nc);
105 if (!ncwd_path) {
106 futex_up(&cwd_futex);
107 return NULL;
108 }
109 futex_up(&cwd_futex);
110 return ncwd_path;
111}
112
113static void vfs_connect(void)
114{
115 while (vfs_phone < 0)
116 vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
117}
118
119int mount(const char *fs_name, const char *mp, const char *dev,
120 const char *opts, unsigned int flags)
121{
122 int res;
123 ipcarg_t rc;
124 aid_t req;
125 dev_handle_t dev_handle;
126
127 res = devmap_device_get_handle(dev, &dev_handle, flags);
128 if (res != EOK)
129 return res;
130
131 size_t mpa_size;
132 char *mpa = absolutize(mp, &mpa_size);
133 if (!mpa)
134 return ENOMEM;
135
136 futex_down(&vfs_phone_futex);
137 async_serialize_start();
138 vfs_connect();
139
140 req = async_send_2(vfs_phone, VFS_IN_MOUNT, dev_handle, flags, NULL);
141 rc = ipc_data_write_start(vfs_phone, (void *) mpa, mpa_size);
142 if (rc != EOK) {
143 async_wait_for(req, NULL);
144 async_serialize_end();
145 futex_up(&vfs_phone_futex);
146 free(mpa);
147 return (int) rc;
148 }
149
150 rc = ipc_data_write_start(vfs_phone, (void *) opts, str_size(opts));
151 if (rc != EOK) {
152 async_wait_for(req, NULL);
153 async_serialize_end();
154 futex_up(&vfs_phone_futex);
155 free(mpa);
156 return (int) rc;
157 }
158
159 rc = ipc_data_write_start(vfs_phone, (void *) fs_name, str_size(fs_name));
160 if (rc != EOK) {
161 async_wait_for(req, NULL);
162 async_serialize_end();
163 futex_up(&vfs_phone_futex);
164 free(mpa);
165 return (int) rc;
166 }
167
168 /* Ask VFS whether it likes fs_name. */
169 rc = async_req_0_0(vfs_phone, IPC_M_PING);
170 if (rc != EOK) {
171 async_wait_for(req, NULL);
172 async_serialize_end();
173 futex_up(&vfs_phone_futex);
174 free(mpa);
175 return (int) rc;
176 }
177
178 async_wait_for(req, &rc);
179 async_serialize_end();
180 futex_up(&vfs_phone_futex);
181 free(mpa);
182
183 return (int) rc;
184}
185
186static int _open(const char *path, int lflag, int oflag, ...)
187{
188 ipcarg_t rc;
189 ipc_call_t answer;
190 aid_t req;
191
192 size_t pa_size;
193 char *pa = absolutize(path, &pa_size);
194 if (!pa)
195 return ENOMEM;
196
197 futex_down(&vfs_phone_futex);
198 async_serialize_start();
199 vfs_connect();
200
201 req = async_send_3(vfs_phone, VFS_IN_OPEN, lflag, oflag, 0, &answer);
202 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
203 if (rc != EOK) {
204 async_wait_for(req, NULL);
205 async_serialize_end();
206 futex_up(&vfs_phone_futex);
207 free(pa);
208 return (int) rc;
209 }
210 async_wait_for(req, &rc);
211 async_serialize_end();
212 futex_up(&vfs_phone_futex);
213 free(pa);
214
215 if (rc != EOK)
216 return (int) rc;
217
218 return (int) IPC_GET_ARG1(answer);
219}
220
221int open(const char *path, int oflag, ...)
222{
223 return _open(path, L_FILE, oflag);
224}
225
226int open_node(fdi_node_t *node, int oflag)
227{
228 futex_down(&vfs_phone_futex);
229 async_serialize_start();
230 vfs_connect();
231
232 ipc_call_t answer;
233 aid_t req = async_send_4(vfs_phone, VFS_IN_OPEN_NODE, node->fs_handle,
234 node->dev_handle, node->index, oflag, &answer);
235
236 ipcarg_t rc;
237 async_wait_for(req, &rc);
238 async_serialize_end();
239 futex_up(&vfs_phone_futex);
240
241 if (rc != EOK)
242 return (int) rc;
243
244 return (int) IPC_GET_ARG1(answer);
245}
246
247int close(int fildes)
248{
249 ipcarg_t rc;
250
251 futex_down(&vfs_phone_futex);
252 async_serialize_start();
253 vfs_connect();
254
255 rc = async_req_1_0(vfs_phone, VFS_IN_CLOSE, fildes);
256
257 async_serialize_end();
258 futex_up(&vfs_phone_futex);
259
260 return (int)rc;
261}
262
263ssize_t read(int fildes, void *buf, size_t nbyte)
264{
265 ipcarg_t rc;
266 ipc_call_t answer;
267 aid_t req;
268
269 futex_down(&vfs_phone_futex);
270 async_serialize_start();
271 vfs_connect();
272
273 req = async_send_1(vfs_phone, VFS_IN_READ, fildes, &answer);
274 rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);
275 if (rc != EOK) {
276 async_wait_for(req, NULL);
277 async_serialize_end();
278 futex_up(&vfs_phone_futex);
279 return (ssize_t) rc;
280 }
281 async_wait_for(req, &rc);
282 async_serialize_end();
283 futex_up(&vfs_phone_futex);
284 if (rc == EOK)
285 return (ssize_t) IPC_GET_ARG1(answer);
286 else
287 return rc;
288}
289
290ssize_t write(int fildes, const void *buf, size_t nbyte)
291{
292 ipcarg_t rc;
293 ipc_call_t answer;
294 aid_t req;
295
296 futex_down(&vfs_phone_futex);
297 async_serialize_start();
298 vfs_connect();
299
300 req = async_send_1(vfs_phone, VFS_IN_WRITE, fildes, &answer);
301 rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);
302 if (rc != EOK) {
303 async_wait_for(req, NULL);
304 async_serialize_end();
305 futex_up(&vfs_phone_futex);
306 return (ssize_t) rc;
307 }
308 async_wait_for(req, &rc);
309 async_serialize_end();
310 futex_up(&vfs_phone_futex);
311 if (rc == EOK)
312 return (ssize_t) IPC_GET_ARG1(answer);
313 else
314 return -1;
315}
316
317int fd_phone(int fildes)
318{
319 futex_down(&vfs_phone_futex);
320 async_serialize_start();
321 vfs_connect();
322
323 ipcarg_t device;
324 ipcarg_t rc = async_req_1_1(vfs_phone, VFS_IN_DEVICE, fildes, &device);
325
326 async_serialize_end();
327 futex_up(&vfs_phone_futex);
328
329 if (rc != EOK)
330 return -1;
331
332 return devmap_device_connect((dev_handle_t) device, 0);
333}
334
335int fd_node(int fildes, fdi_node_t *node)
336{
337 futex_down(&vfs_phone_futex);
338 async_serialize_start();
339 vfs_connect();
340
341 ipcarg_t fs_handle;
342 ipcarg_t dev_handle;
343 ipcarg_t index;
344 ipcarg_t rc = async_req_1_3(vfs_phone, VFS_IN_NODE, fildes, &fs_handle,
345 &dev_handle, &index);
346
347 async_serialize_end();
348 futex_up(&vfs_phone_futex);
349
350 if (rc == EOK) {
351 node->fs_handle = (fs_handle_t) fs_handle;
352 node->dev_handle = (dev_handle_t) dev_handle;
353 node->index = (fs_index_t) index;
354 }
355
356 return rc;
357}
358
359int fsync(int fildes)
360{
361 futex_down(&vfs_phone_futex);
362 async_serialize_start();
363 vfs_connect();
364
365 ipcarg_t rc = async_req_1_0(vfs_phone, VFS_IN_SYNC, fildes);
366
367 async_serialize_end();
368 futex_up(&vfs_phone_futex);
369
370 return (int) rc;
371}
372
373off_t lseek(int fildes, off_t offset, int whence)
374{
375 ipcarg_t rc;
376
377 futex_down(&vfs_phone_futex);
378 async_serialize_start();
379 vfs_connect();
380
381 ipcarg_t newoffs;
382 rc = async_req_3_1(vfs_phone, VFS_IN_SEEK, fildes, offset, whence,
383 &newoffs);
384
385 async_serialize_end();
386 futex_up(&vfs_phone_futex);
387
388 if (rc != EOK)
389 return (off_t) -1;
390
391 return (off_t) newoffs;
392}
393
394int ftruncate(int fildes, off_t length)
395{
396 ipcarg_t rc;
397
398 futex_down(&vfs_phone_futex);
399 async_serialize_start();
400 vfs_connect();
401
402 rc = async_req_2_0(vfs_phone, VFS_IN_TRUNCATE, fildes, length);
403 async_serialize_end();
404 futex_up(&vfs_phone_futex);
405 return (int) rc;
406}
407
408DIR *opendir(const char *dirname)
409{
410 DIR *dirp = malloc(sizeof(DIR));
411 if (!dirp)
412 return NULL;
413 dirp->fd = _open(dirname, L_DIRECTORY, 0);
414 if (dirp->fd < 0) {
415 free(dirp);
416 return NULL;
417 }
418 return dirp;
419}
420
421struct dirent *readdir(DIR *dirp)
422{
423 ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);
424 if (len <= 0)
425 return NULL;
426 return &dirp->res;
427}
428
429void rewinddir(DIR *dirp)
430{
431 (void) lseek(dirp->fd, 0, SEEK_SET);
432}
433
434int closedir(DIR *dirp)
435{
436 (void) close(dirp->fd);
437 free(dirp);
438 return 0;
439}
440
441int mkdir(const char *path, mode_t mode)
442{
443 ipcarg_t rc;
444 aid_t req;
445
446 size_t pa_size;
447 char *pa = absolutize(path, &pa_size);
448 if (!pa)
449 return ENOMEM;
450
451 futex_down(&vfs_phone_futex);
452 async_serialize_start();
453 vfs_connect();
454
455 req = async_send_1(vfs_phone, VFS_IN_MKDIR, mode, NULL);
456 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
457 if (rc != EOK) {
458 async_wait_for(req, NULL);
459 async_serialize_end();
460 futex_up(&vfs_phone_futex);
461 free(pa);
462 return (int) rc;
463 }
464 async_wait_for(req, &rc);
465 async_serialize_end();
466 futex_up(&vfs_phone_futex);
467 free(pa);
468 return rc;
469}
470
471static int _unlink(const char *path, int lflag)
472{
473 ipcarg_t rc;
474 aid_t req;
475
476 size_t pa_size;
477 char *pa = absolutize(path, &pa_size);
478 if (!pa)
479 return ENOMEM;
480
481 futex_down(&vfs_phone_futex);
482 async_serialize_start();
483 vfs_connect();
484
485 req = async_send_0(vfs_phone, VFS_IN_UNLINK, NULL);
486 rc = ipc_data_write_start(vfs_phone, pa, pa_size);
487 if (rc != EOK) {
488 async_wait_for(req, NULL);
489 async_serialize_end();
490 futex_up(&vfs_phone_futex);
491 free(pa);
492 return (int) rc;
493 }
494 async_wait_for(req, &rc);
495 async_serialize_end();
496 futex_up(&vfs_phone_futex);
497 free(pa);
498 return rc;
499}
500
501int unlink(const char *path)
502{
503 return _unlink(path, L_NONE);
504}
505
506int rmdir(const char *path)
507{
508 return _unlink(path, L_DIRECTORY);
509}
510
511int rename(const char *old, const char *new)
512{
513 ipcarg_t rc;
514 aid_t req;
515
516 size_t olda_size;
517 char *olda = absolutize(old, &olda_size);
518 if (!olda)
519 return ENOMEM;
520
521 size_t newa_size;
522 char *newa = absolutize(new, &newa_size);
523 if (!newa) {
524 free(olda);
525 return ENOMEM;
526 }
527
528 futex_down(&vfs_phone_futex);
529 async_serialize_start();
530 vfs_connect();
531
532 req = async_send_0(vfs_phone, VFS_IN_RENAME, NULL);
533 rc = ipc_data_write_start(vfs_phone, olda, olda_size);
534 if (rc != EOK) {
535 async_wait_for(req, NULL);
536 async_serialize_end();
537 futex_up(&vfs_phone_futex);
538 free(olda);
539 free(newa);
540 return (int) rc;
541 }
542 rc = ipc_data_write_start(vfs_phone, newa, newa_size);
543 if (rc != EOK) {
544 async_wait_for(req, NULL);
545 async_serialize_end();
546 futex_up(&vfs_phone_futex);
547 free(olda);
548 free(newa);
549 return (int) rc;
550 }
551 async_wait_for(req, &rc);
552 async_serialize_end();
553 futex_up(&vfs_phone_futex);
554 free(olda);
555 free(newa);
556 return rc;
557}
558
559int chdir(const char *path)
560{
561 size_t pa_size;
562 char *pa = absolutize(path, &pa_size);
563 if (!pa)
564 return ENOMEM;
565
566 DIR *d = opendir(pa);
567 if (!d) {
568 free(pa);
569 return ENOENT;
570 }
571
572 futex_down(&cwd_futex);
573 if (cwd_dir) {
574 closedir(cwd_dir);
575 cwd_dir = NULL;
576 free(cwd_path);
577 cwd_path = NULL;
578 cwd_size = 0;
579 }
580 cwd_dir = d;
581 cwd_path = pa;
582 cwd_size = pa_size;
583 futex_up(&cwd_futex);
584 return EOK;
585}
586
587char *getcwd(char *buf, size_t size)
588{
589 if (!size)
590 return NULL;
591 futex_down(&cwd_futex);
592 if (size < cwd_size + 1) {
593 futex_up(&cwd_futex);
594 return NULL;
595 }
596 str_cpy(buf, size, cwd_path);
597 futex_up(&cwd_futex);
598 return buf;
599}
600
601/** @}
602 */
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