?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
add port definition for mcf UART driver
[linux-2.6/next.git] / net / 9p / client.c
blobaf9199364049becdb5fb3442e43581e485173cd9
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to:
19 * Free Software Foundation
20 * 51 Franklin Street, Fifth Floor
21 * Boston, MA 02111-1301 USA
22 *
23 */
24
25 #include <linux/module.h>
26 #include <linux/errno.h>
27 #include <linux/fs.h>
28 #include <linux/idr.h>
29 #include <linux/mutex.h>
30 #include <linux/sched.h>
31 #include <linux/uaccess.h>
32 #include <net/9p/9p.h>
33 #include <linux/parser.h>
34 #include <net/9p/transport.h>
35 #include <net/9p/conn.h>
36 #include <net/9p/client.h>
37
38 static struct p9_fid *p9_fid_create(struct p9_client *clnt);
39 static void p9_fid_destroy(struct p9_fid *fid);
40 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
41
42 struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
43 int dotu)
44 {
45 int err, n;
46 struct p9_client *clnt;
47 struct p9_fcall *tc, *rc;
48 struct p9_str *version;
49
50 err = 0;
51 tc = NULL;
52 rc = NULL;
53 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
54 if (!clnt)
55 return ERR_PTR(-ENOMEM);
56
57 P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
58 clnt, trans, msize, dotu);
59 spin_lock_init(&clnt->lock);
60 clnt->trans = trans;
61 clnt->msize = msize;
62 clnt->dotu = dotu;
63 INIT_LIST_HEAD(&clnt->fidlist);
64 clnt->fidpool = p9_idpool_create();
65 if (!clnt->fidpool) {
66 err = PTR_ERR(clnt->fidpool);
67 clnt->fidpool = NULL;
68 goto error;
69 }
70
71 clnt->conn = p9_conn_create(clnt->trans, clnt->msize, &clnt->dotu);
72 if (IS_ERR(clnt->conn)) {
73 err = PTR_ERR(clnt->conn);
74 clnt->conn = NULL;
75 goto error;
76 }
77
78 tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
79 if (IS_ERR(tc)) {
80 err = PTR_ERR(tc);
81 tc = NULL;
82 goto error;
83 }
84
85 err = p9_conn_rpc(clnt->conn, tc, &rc);
86 if (err)
87 goto error;
88
89 version = &rc->params.rversion.version;
90 if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
91 clnt->dotu = 1;
92 else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
93 clnt->dotu = 0;
94 else {
95 err = -EREMOTEIO;
96 goto error;
97 }
98
99 n = rc->params.rversion.msize;
100 if (n < clnt->msize)
101 clnt->msize = n;
102
103 kfree(tc);
104 kfree(rc);
105 return clnt;
106
107 error:
108 kfree(tc);
109 kfree(rc);
110 p9_client_destroy(clnt);
111 return ERR_PTR(err);
112 }
113 EXPORT_SYMBOL(p9_client_create);
114
115 void p9_client_destroy(struct p9_client *clnt)
116 {
117 struct p9_fid *fid, *fidptr;
118
119 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
120 if (clnt->conn) {
121 p9_conn_destroy(clnt->conn);
122 clnt->conn = NULL;
123 }
124
125 if (clnt->trans) {
126 clnt->trans->close(clnt->trans);
127 kfree(clnt->trans);
128 clnt->trans = NULL;
129 }
130
131 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
132 p9_fid_destroy(fid);
133
134 if (clnt->fidpool)
135 p9_idpool_destroy(clnt->fidpool);
136
137 kfree(clnt);
138 }
139 EXPORT_SYMBOL(p9_client_destroy);
140
141 void p9_client_disconnect(struct p9_client *clnt)
142 {
143 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
144 clnt->trans->status = Disconnected;
145 p9_conn_cancel(clnt->conn, -EIO);
146 }
147 EXPORT_SYMBOL(p9_client_disconnect);
148
149 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
150 char *uname, u32 n_uname, char *aname)
151 {
152 int err;
153 struct p9_fcall *tc, *rc;
154 struct p9_fid *fid;
155
156 P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
157 clnt, afid?afid->fid:-1, uname, aname);
158 err = 0;
159 tc = NULL;
160 rc = NULL;
161
162 fid = p9_fid_create(clnt);
163 if (IS_ERR(fid)) {
164 err = PTR_ERR(fid);
165 fid = NULL;
166 goto error;
167 }
168
169 tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname,
170 n_uname, clnt->dotu);
171 if (IS_ERR(tc)) {
172 err = PTR_ERR(tc);
173 tc = NULL;
174 goto error;
175 }
176
177 err = p9_conn_rpc(clnt->conn, tc, &rc);
178 if (err)
179 goto error;
180
181 memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
182 kfree(tc);
183 kfree(rc);
184 return fid;
185
186 error:
187 kfree(tc);
188 kfree(rc);
189 if (fid)
190 p9_fid_destroy(fid);
191 return ERR_PTR(err);
192 }
193 EXPORT_SYMBOL(p9_client_attach);
194
195 struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
196 u32 n_uname, char *aname)
197 {
198 int err;
199 struct p9_fcall *tc, *rc;
200 struct p9_fid *fid;
201
202 P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
203 aname);
204 err = 0;
205 tc = NULL;
206 rc = NULL;
207
208 fid = p9_fid_create(clnt);
209 if (IS_ERR(fid)) {
210 err = PTR_ERR(fid);
211 fid = NULL;
212 goto error;
213 }
214
215 tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu);
216 if (IS_ERR(tc)) {
217 err = PTR_ERR(tc);
218 tc = NULL;
219 goto error;
220 }
221
222 err = p9_conn_rpc(clnt->conn, tc, &rc);
223 if (err)
224 goto error;
225
226 memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
227 kfree(tc);
228 kfree(rc);
229 return fid;
230
231 error:
232 kfree(tc);
233 kfree(rc);
234 if (fid)
235 p9_fid_destroy(fid);
236 return ERR_PTR(err);
237 }
238 EXPORT_SYMBOL(p9_client_auth);
239
240 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
241 int clone)
242 {
243 int err;
244 struct p9_fcall *tc, *rc;
245 struct p9_client *clnt;
246 struct p9_fid *fid;
247
248 P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
249 oldfid->fid, nwname, wnames?wnames[0]:NULL);
250 err = 0;
251 tc = NULL;
252 rc = NULL;
253 clnt = oldfid->clnt;
254 if (clone) {
255 fid = p9_fid_create(clnt);
256 if (IS_ERR(fid)) {
257 err = PTR_ERR(fid);
258 fid = NULL;
259 goto error;
260 }
261
262 fid->uid = oldfid->uid;
263 } else
264 fid = oldfid;
265
266 tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
267 if (IS_ERR(tc)) {
268 err = PTR_ERR(tc);
269 tc = NULL;
270 goto error;
271 }
272
273 err = p9_conn_rpc(clnt->conn, tc, &rc);
274 if (err) {
275 if (rc && rc->id == P9_RWALK)
276 goto clunk_fid;
277 else
278 goto error;
279 }
280
281 if (rc->params.rwalk.nwqid != nwname) {
282 err = -ENOENT;
283 goto clunk_fid;
284 }
285
286 if (nwname)
287 memmove(&fid->qid,
288 &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
289 sizeof(struct p9_qid));
290 else
291 fid->qid = oldfid->qid;
292
293 kfree(tc);
294 kfree(rc);
295 return fid;
296
297 clunk_fid:
298 kfree(tc);
299 kfree(rc);
300 rc = NULL;
301 tc = p9_create_tclunk(fid->fid);
302 if (IS_ERR(tc)) {
303 err = PTR_ERR(tc);
304 tc = NULL;
305 goto error;
306 }
307
308 p9_conn_rpc(clnt->conn, tc, &rc);
309
310 error:
311 kfree(tc);
312 kfree(rc);
313 if (fid && (fid != oldfid))
314 p9_fid_destroy(fid);
315
316 return ERR_PTR(err);
317 }
318 EXPORT_SYMBOL(p9_client_walk);
319
320 int p9_client_open(struct p9_fid *fid, int mode)
321 {
322 int err;
323 struct p9_fcall *tc, *rc;
324 struct p9_client *clnt;
325
326 P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
327 err = 0;
328 tc = NULL;
329 rc = NULL;
330 clnt = fid->clnt;
331
332 if (fid->mode != -1)
333 return -EINVAL;
334
335 tc = p9_create_topen(fid->fid, mode);
336 if (IS_ERR(tc)) {
337 err = PTR_ERR(tc);
338 tc = NULL;
339 goto done;
340 }
341
342 err = p9_conn_rpc(clnt->conn, tc, &rc);
343 if (err)
344 goto done;
345
346 fid->mode = mode;
347 fid->iounit = rc->params.ropen.iounit;
348
349 done:
350 kfree(tc);
351 kfree(rc);
352 return err;
353 }
354 EXPORT_SYMBOL(p9_client_open);
355
356 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
357 char *extension)
358 {
359 int err;
360 struct p9_fcall *tc, *rc;
361 struct p9_client *clnt;
362
363 P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
364 name, perm, mode);
365 err = 0;
366 tc = NULL;
367 rc = NULL;
368 clnt = fid->clnt;
369
370 if (fid->mode != -1)
371 return -EINVAL;
372
373 tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
374 clnt->dotu);
375 if (IS_ERR(tc)) {
376 err = PTR_ERR(tc);
377 tc = NULL;
378 goto done;
379 }
380
381 err = p9_conn_rpc(clnt->conn, tc, &rc);
382 if (err)
383 goto done;
384
385 fid->mode = mode;
386 fid->iounit = rc->params.ropen.iounit;
387
388 done:
389 kfree(tc);
390 kfree(rc);
391 return err;
392 }
393 EXPORT_SYMBOL(p9_client_fcreate);
394
395 int p9_client_clunk(struct p9_fid *fid)
396 {
397 int err;
398 struct p9_fcall *tc, *rc;
399 struct p9_client *clnt;
400
401 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
402 err = 0;
403 tc = NULL;
404 rc = NULL;
405 clnt = fid->clnt;
406
407 tc = p9_create_tclunk(fid->fid);
408 if (IS_ERR(tc)) {
409 err = PTR_ERR(tc);
410 tc = NULL;
411 goto done;
412 }
413
414 err = p9_conn_rpc(clnt->conn, tc, &rc);
415 if (err)
416 goto done;
417
418 p9_fid_destroy(fid);
419
420 done:
421 kfree(tc);
422 kfree(rc);
423 return err;
424 }
425 EXPORT_SYMBOL(p9_client_clunk);
426
427 int p9_client_remove(struct p9_fid *fid)
428 {
429 int err;
430 struct p9_fcall *tc, *rc;
431 struct p9_client *clnt;
432
433 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
434 err = 0;
435 tc = NULL;
436 rc = NULL;
437 clnt = fid->clnt;
438
439 tc = p9_create_tremove(fid->fid);
440 if (IS_ERR(tc)) {
441 err = PTR_ERR(tc);
442 tc = NULL;
443 goto done;
444 }
445
446 err = p9_conn_rpc(clnt->conn, tc, &rc);
447 if (err)
448 goto done;
449
450 p9_fid_destroy(fid);
451
452 done:
453 kfree(tc);
454 kfree(rc);
455 return err;
456 }
457 EXPORT_SYMBOL(p9_client_remove);
458
459 int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
460 {
461 int err, n, rsize, total;
462 struct p9_fcall *tc, *rc;
463 struct p9_client *clnt;
464
465 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
466 (long long unsigned) offset, count);
467 err = 0;
468 tc = NULL;
469 rc = NULL;
470 clnt = fid->clnt;
471 total = 0;
472
473 rsize = fid->iounit;
474 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
475 rsize = clnt->msize - P9_IOHDRSZ;
476
477 do {
478 if (count < rsize)
479 rsize = count;
480
481 tc = p9_create_tread(fid->fid, offset, rsize);
482 if (IS_ERR(tc)) {
483 err = PTR_ERR(tc);
484 tc = NULL;
485 goto error;
486 }
487
488 err = p9_conn_rpc(clnt->conn, tc, &rc);
489 if (err)
490 goto error;
491
492 n = rc->params.rread.count;
493 if (n > count)
494 n = count;
495
496 memmove(data, rc->params.rread.data, n);
497 count -= n;
498 data += n;
499 offset += n;
500 total += n;
501 kfree(tc);
502 tc = NULL;
503 kfree(rc);
504 rc = NULL;
505 } while (count > 0 && n == rsize);
506
507 return total;
508
509 error:
510 kfree(tc);
511 kfree(rc);
512 return err;
513 }
514 EXPORT_SYMBOL(p9_client_read);
515
516 int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
517 {
518 int err, n, rsize, total;
519 struct p9_fcall *tc, *rc;
520 struct p9_client *clnt;
521
522 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
523 (long long unsigned) offset, count);
524 err = 0;
525 tc = NULL;
526 rc = NULL;
527 clnt = fid->clnt;
528 total = 0;
529
530 rsize = fid->iounit;
531 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
532 rsize = clnt->msize - P9_IOHDRSZ;
533
534 do {
535 if (count < rsize)
536 rsize = count;
537
538 tc = p9_create_twrite(fid->fid, offset, rsize, data);
539 if (IS_ERR(tc)) {
540 err = PTR_ERR(tc);
541 tc = NULL;
542 goto error;
543 }
544
545 err = p9_conn_rpc(clnt->conn, tc, &rc);
546 if (err)
547 goto error;
548
549 n = rc->params.rread.count;
550 count -= n;
551 data += n;
552 offset += n;
553 total += n;
554 kfree(tc);
555 tc = NULL;
556 kfree(rc);
557 rc = NULL;
558 } while (count > 0);
559
560 return total;
561
562 error:
563 kfree(tc);
564 kfree(rc);
565 return err;
566 }
567 EXPORT_SYMBOL(p9_client_write);
568
569 int
570 p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
571 {
572 int err, n, rsize, total;
573 struct p9_fcall *tc, *rc;
574 struct p9_client *clnt;
575
576 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
577 (long long unsigned) offset, count);
578 err = 0;
579 tc = NULL;
580 rc = NULL;
581 clnt = fid->clnt;
582 total = 0;
583
584 rsize = fid->iounit;
585 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
586 rsize = clnt->msize - P9_IOHDRSZ;
587
588 do {
589 if (count < rsize)
590 rsize = count;
591
592 tc = p9_create_tread(fid->fid, offset, rsize);
593 if (IS_ERR(tc)) {
594 err = PTR_ERR(tc);
595 tc = NULL;
596 goto error;
597 }
598
599 err = p9_conn_rpc(clnt->conn, tc, &rc);
600 if (err)
601 goto error;
602
603 n = rc->params.rread.count;
604 if (n > count)
605 n = count;
606
607 err = copy_to_user(data, rc->params.rread.data, n);
608 if (err) {
609 err = -EFAULT;
610 goto error;
611 }
612
613 count -= n;
614 data += n;
615 offset += n;
616 total += n;
617 kfree(tc);
618 tc = NULL;
619 kfree(rc);
620 rc = NULL;
621 } while (count > 0 && n == rsize);
622
623 return total;
624
625 error:
626 kfree(tc);
627 kfree(rc);
628 return err;
629 }
630 EXPORT_SYMBOL(p9_client_uread);
631
632 int
633 p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
634 u32 count)
635 {
636 int err, n, rsize, total;
637 struct p9_fcall *tc, *rc;
638 struct p9_client *clnt;
639
640 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
641 (long long unsigned) offset, count);
642 err = 0;
643 tc = NULL;
644 rc = NULL;
645 clnt = fid->clnt;
646 total = 0;
647
648 rsize = fid->iounit;
649 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
650 rsize = clnt->msize - P9_IOHDRSZ;
651
652 do {
653 if (count < rsize)
654 rsize = count;
655
656 tc = p9_create_twrite_u(fid->fid, offset, rsize, data);
657 if (IS_ERR(tc)) {
658 err = PTR_ERR(tc);
659 tc = NULL;
660 goto error;
661 }
662
663 err = p9_conn_rpc(clnt->conn, tc, &rc);
664 if (err)
665 goto error;
666
667 n = rc->params.rread.count;
668 count -= n;
669 data += n;
670 offset += n;
671 total += n;
672 kfree(tc);
673 tc = NULL;
674 kfree(rc);
675 rc = NULL;
676 } while (count > 0);
677
678 return total;
679
680 error:
681 kfree(tc);
682 kfree(rc);
683 return err;
684 }
685 EXPORT_SYMBOL(p9_client_uwrite);
686
687 int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
688 {
689 int n, total;
690
691 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
692 (long long unsigned) offset, count);
693 n = 0;
694 total = 0;
695 while (count) {
696 n = p9_client_read(fid, data, offset, count);
697 if (n <= 0)
698 break;
699
700 data += n;
701 offset += n;
702 count -= n;
703 total += n;
704 }
705
706 if (n < 0)
707 total = n;
708
709 return total;
710 }
711 EXPORT_SYMBOL(p9_client_readn);
712
713 struct p9_stat *p9_client_stat(struct p9_fid *fid)
714 {
715 int err;
716 struct p9_fcall *tc, *rc;
717 struct p9_client *clnt;
718 struct p9_stat *ret;
719
720 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
721 err = 0;
722 tc = NULL;
723 rc = NULL;
724 ret = NULL;
725 clnt = fid->clnt;
726
727 tc = p9_create_tstat(fid->fid);
728 if (IS_ERR(tc)) {
729 err = PTR_ERR(tc);
730 tc = NULL;
731 goto error;
732 }
733
734 err = p9_conn_rpc(clnt->conn, tc, &rc);
735 if (err)
736 goto error;
737
738 ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
739 if (IS_ERR(ret)) {
740 err = PTR_ERR(ret);
741 ret = NULL;
742 goto error;
743 }
744
745 kfree(tc);
746 kfree(rc);
747 return ret;
748
749 error:
750 kfree(tc);
751 kfree(rc);
752 kfree(ret);
753 return ERR_PTR(err);
754 }
755 EXPORT_SYMBOL(p9_client_stat);
756
757 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
758 {
759 int err;
760 struct p9_fcall *tc, *rc;
761 struct p9_client *clnt;
762
763 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
764 err = 0;
765 tc = NULL;
766 rc = NULL;
767 clnt = fid->clnt;
768
769 tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
770 if (IS_ERR(tc)) {
771 err = PTR_ERR(tc);
772 tc = NULL;
773 goto done;
774 }
775
776 err = p9_conn_rpc(clnt->conn, tc, &rc);
777
778 done:
779 kfree(tc);
780 kfree(rc);
781 return err;
782 }
783 EXPORT_SYMBOL(p9_client_wstat);
784
785 struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
786 {
787 int err, n, m;
788 struct p9_fcall *tc, *rc;
789 struct p9_client *clnt;
790 struct p9_stat st, *ret;
791
792 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid,
793 (long long unsigned) offset);
794 err = 0;
795 tc = NULL;
796 rc = NULL;
797 ret = NULL;
798 clnt = fid->clnt;
799
800 /* if the offset is below or above the current response, free it */
801 if (offset < fid->rdir_fpos || (fid->rdir_fcall &&
802 offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) {
803 fid->rdir_pos = 0;
804 if (fid->rdir_fcall)
805 fid->rdir_fpos += fid->rdir_fcall->params.rread.count;
806
807 kfree(fid->rdir_fcall);
808 fid->rdir_fcall = NULL;
809 if (offset < fid->rdir_fpos)
810 fid->rdir_fpos = 0;
811 }
812
813 if (!fid->rdir_fcall) {
814 n = fid->iounit;
815 if (!n || n > clnt->msize-P9_IOHDRSZ)
816 n = clnt->msize - P9_IOHDRSZ;
817
818 while (1) {
819 if (fid->rdir_fcall) {
820 fid->rdir_fpos +=
821 fid->rdir_fcall->params.rread.count;
822 kfree(fid->rdir_fcall);
823 fid->rdir_fcall = NULL;
824 }
825
826 tc = p9_create_tread(fid->fid, fid->rdir_fpos, n);
827 if (IS_ERR(tc)) {
828 err = PTR_ERR(tc);
829 tc = NULL;
830 goto error;
831 }
832
833 err = p9_conn_rpc(clnt->conn, tc, &rc);
834 if (err)
835 goto error;
836
837 n = rc->params.rread.count;
838 if (n == 0)
839 goto done;
840
841 fid->rdir_fcall = rc;
842 rc = NULL;
843 if (offset >= fid->rdir_fpos &&
844 offset < fid->rdir_fpos+n)
845 break;
846 }
847
848 fid->rdir_pos = 0;
849 }
850
851 m = offset - fid->rdir_fpos;
852 if (m < 0)
853 goto done;
854
855 n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m,
856 fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu);
857
858 if (!n) {
859 err = -EIO;
860 goto error;
861 }
862
863 fid->rdir_pos += n;
864 st.size = n;
865 ret = p9_clone_stat(&st, clnt->dotu);
866 if (IS_ERR(ret)) {
867 err = PTR_ERR(ret);
868 ret = NULL;
869 goto error;
870 }
871
872 done:
873 kfree(tc);
874 kfree(rc);
875 return ret;
876
877 error:
878 kfree(tc);
879 kfree(rc);
880 kfree(ret);
881 return ERR_PTR(err);
882 }
883 EXPORT_SYMBOL(p9_client_dirread);
884
885 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
886 {
887 int n;
888 char *p;
889 struct p9_stat *ret;
890
891 n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
892 st->muid.len;
893
894 if (dotu)
895 n += st->extension.len;
896
897 ret = kmalloc(n, GFP_KERNEL);
898 if (!ret)
899 return ERR_PTR(-ENOMEM);
900
901 memmove(ret, st, sizeof(struct p9_stat));
902 p = ((char *) ret) + sizeof(struct p9_stat);
903 memmove(p, st->name.str, st->name.len);
904 p += st->name.len;
905 memmove(p, st->uid.str, st->uid.len);
906 p += st->uid.len;
907 memmove(p, st->gid.str, st->gid.len);
908 p += st->gid.len;
909 memmove(p, st->muid.str, st->muid.len);
910 p += st->muid.len;
911
912 if (dotu) {
913 memmove(p, st->extension.str, st->extension.len);
914 p += st->extension.len;
915 }
916
917 return ret;
918 }
919
920 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
921 {
922 int err;
923 struct p9_fid *fid;
924
925 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
926 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
927 if (!fid)
928 return ERR_PTR(-ENOMEM);
929
930 fid->fid = p9_idpool_get(clnt->fidpool);
931 if (fid->fid < 0) {
932 err = -ENOSPC;
933 goto error;
934 }
935
936 memset(&fid->qid, 0, sizeof(struct p9_qid));
937 fid->mode = -1;
938 fid->rdir_fpos = 0;
939 fid->rdir_pos = 0;
940 fid->rdir_fcall = NULL;
941 fid->uid = current->fsuid;
942 fid->clnt = clnt;
943 fid->aux = NULL;
944
945 spin_lock(&clnt->lock);
946 list_add(&fid->flist, &clnt->fidlist);
947 spin_unlock(&clnt->lock);
948
949 return fid;
950
951 error:
952 kfree(fid);
953 return ERR_PTR(err);
954 }
955
956 static void p9_fid_destroy(struct p9_fid *fid)
957 {
958 struct p9_client *clnt;
959
960 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
961 clnt = fid->clnt;
962 p9_idpool_put(fid->fid, clnt->fidpool);
963 spin_lock(&clnt->lock);
964 list_del(&fid->flist);
965 spin_unlock(&clnt->lock);
966 kfree(fid->rdir_fcall);
967 kfree(fid);
968 }
linux-next