1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/sched.h>
33 #include <linux/uaccess.h>
34 #include <net/9p/9p.h>
35 #include <linux/parser.h>
36 #include <net/9p/transport.h>
37 #include <net/9p/client.h>
38
39 static struct p9_fid *p9_fid_create(struct p9_client *clnt);
40 static void p9_fid_destroy(struct p9_fid *fid);
41 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
42
43 /*
44 * Client Option Parsing (code inspired by NFS code)
45 * - a little lazy - parse all client options
46 */
47
48 enum {
49 Opt_msize,
50 Opt_trans,
51 Opt_legacy,
52 Opt_err,
53 };
54
55 static match_table_t tokens = {
56 {Opt_msize, "msize=%u"},
57 {Opt_legacy, "noextend"},
58 {Opt_trans, "trans=%s"},
59 {Opt_err, NULL},
60 };
61
62 /**
63 * v9fs_parse_options - parse mount options into session structure
64 * @options: options string passed from mount
65 * @v9ses: existing v9fs session information
66 *
67 */
68
69 static void parse_opts(char *options, struct p9_client *clnt)
70 {
71 char *p;
72 substring_t args[MAX_OPT_ARGS];
73 int option;
74 int ret;
75
76 clnt->trans_mod = v9fs_default_trans();
77 clnt->dotu = 1;
78 clnt->msize = 8192;
79
80 if (!options)
81 return;
82
83 while ((p = strsep(&options, ",")) != NULL) {
84 int token;
85 if (!*p)
86 continue;
87 token = match_token(p, tokens, args);
88 if (token < Opt_trans) {
89 ret = match_int(&args[0], &option);
90 if (ret < 0) {
91 P9_DPRINTK(P9_DEBUG_ERROR,
92 "integer field, but no integer?\n");
93 continue;
94 }
95 }
96 switch (token) {
97 case Opt_msize:
98 clnt->msize = option;
99 break;
100 case Opt_trans:
101 clnt->trans_mod = v9fs_match_trans(&args[0]);
102 break;
103 case Opt_legacy:
104 clnt->dotu = 0;
105 break;
106 default:
107 continue;
108 }
109 }
110 }
111
112
113 /**
114 * p9_client_rpc - sends 9P request and waits until a response is available.
115 * The function can be interrupted.
116 * @c: client data
117 * @tc: request to be sent
118 * @rc: pointer where a pointer to the response is stored
119 */
120 int
121 p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
122 struct p9_fcall **rc)
123 {
124 return c->trans->rpc(c->trans, tc, rc);
125 }
126
127 struct p9_client *p9_client_create(const char *dev_name, char *options)
128 {
129 int err, n;
130 struct p9_client *clnt;
131 struct p9_fcall *tc, *rc;
132 struct p9_str *version;
133
134 err = 0;
135 tc = NULL;
136 rc = NULL;
137 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
138 if (!clnt)
139 return ERR_PTR(-ENOMEM);
140
141 spin_lock_init(&clnt->lock);
142 INIT_LIST_HEAD(&clnt->fidlist);
143 clnt->fidpool = p9_idpool_create();
144 if (!clnt->fidpool) {
145 err = PTR_ERR(clnt->fidpool);
146 clnt->fidpool = NULL;
147 goto error;
148 }
149
150 parse_opts(options, clnt);
151 if (clnt->trans_mod == NULL) {
152 err = -EPROTONOSUPPORT;
153 P9_DPRINTK(P9_DEBUG_ERROR,
154 "No transport defined or default transport\n");
155 goto error;
156 }
157
158 P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
159 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
160
161
162 clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize,
163 clnt->dotu);
164 if (IS_ERR(clnt->trans)) {
165 err = PTR_ERR(clnt->trans);
166 clnt->trans = NULL;
167 goto error;
168 }
169
170 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
171 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
172
173 tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
174 if (IS_ERR(tc)) {
175 err = PTR_ERR(tc);
176 tc = NULL;
177 goto error;
178 }
179
180 err = p9_client_rpc(clnt, tc, &rc);
181 if (err)
182 goto error;
183
184 version = &rc->params.rversion.version;
185 if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
186 clnt->dotu = 1;
187 else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
188 clnt->dotu = 0;
189 else {
190 err = -EREMOTEIO;
191 goto error;
192 }
193
194 n = rc->params.rversion.msize;
195 if (n < clnt->msize)
196 clnt->msize = n;
197
198 kfree(tc);
199 kfree(rc);
200 return clnt;
201
202 error:
203 kfree(tc);
204 kfree(rc);
205 p9_client_destroy(clnt);
206 return ERR_PTR(err);
207 }
208 EXPORT_SYMBOL(p9_client_create);
209
210 void p9_client_destroy(struct p9_client *clnt)
211 {
212 struct p9_fid *fid, *fidptr;
213
214 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
215
216 if (clnt->trans) {
217 clnt->trans->close(clnt->trans);
218 kfree(clnt->trans);
219 clnt->trans = NULL;
220 }
221
222 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
223 p9_fid_destroy(fid);
224
225 if (clnt->fidpool)
226 p9_idpool_destroy(clnt->fidpool);
227
228 kfree(clnt);
229 }
230 EXPORT_SYMBOL(p9_client_destroy);
231
232 void p9_client_disconnect(struct p9_client *clnt)
233 {
234 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
235 clnt->trans->status = Disconnected;
236 }
237 EXPORT_SYMBOL(p9_client_disconnect);
238
239 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
240 char *uname, u32 n_uname, char *aname)
241 {
242 int err;
243 struct p9_fcall *tc, *rc;
244 struct p9_fid *fid;
245
246 P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
247 clnt, afid?afid->fid:-1, uname, aname);
248 err = 0;
249 tc = NULL;
250 rc = NULL;
251
252 fid = p9_fid_create(clnt);
253 if (IS_ERR(fid)) {
254 err = PTR_ERR(fid);
255 fid = NULL;
256 goto error;
257 }
258
259 tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname,
260 n_uname, clnt->dotu);
261 if (IS_ERR(tc)) {
262 err = PTR_ERR(tc);
263 tc = NULL;
264 goto error;
265 }
266
267 err = p9_client_rpc(clnt, tc, &rc);
268 if (err)
269 goto error;
270
271 memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
272 kfree(tc);
273 kfree(rc);
274 return fid;
275
276 error:
277 kfree(tc);
278 kfree(rc);
279 if (fid)
280 p9_fid_destroy(fid);
281 return ERR_PTR(err);
282 }
283 EXPORT_SYMBOL(p9_client_attach);
284
285 struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
286 u32 n_uname, char *aname)
287 {
288 int err;
289 struct p9_fcall *tc, *rc;
290 struct p9_fid *fid;
291
292 P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
293 aname);
294 err = 0;
295 tc = NULL;
296 rc = NULL;
297
298 fid = p9_fid_create(clnt);
299 if (IS_ERR(fid)) {
300 err = PTR_ERR(fid);
301 fid = NULL;
302 goto error;
303 }
304
305 tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu);
306 if (IS_ERR(tc)) {
307 err = PTR_ERR(tc);
308 tc = NULL;
309 goto error;
310 }
311
312 err = p9_client_rpc(clnt, tc, &rc);
313 if (err)
314 goto error;
315
316 memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
317 kfree(tc);
318 kfree(rc);
319 return fid;
320
321 error:
322 kfree(tc);
323 kfree(rc);
324 if (fid)
325 p9_fid_destroy(fid);
326 return ERR_PTR(err);
327 }
328 EXPORT_SYMBOL(p9_client_auth);
329
330 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
331 int clone)
332 {
333 int err;
334 struct p9_fcall *tc, *rc;
335 struct p9_client *clnt;
336 struct p9_fid *fid;
337
338 P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
339 oldfid->fid, nwname, wnames?wnames[0]:NULL);
340 err = 0;
341 tc = NULL;
342 rc = NULL;
343 clnt = oldfid->clnt;
344 if (clone) {
345 fid = p9_fid_create(clnt);
346 if (IS_ERR(fid)) {
347 err = PTR_ERR(fid);
348 fid = NULL;
349 goto error;
350 }
351
352 fid->uid = oldfid->uid;
353 } else
354 fid = oldfid;
355
356 tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
357 if (IS_ERR(tc)) {
358 err = PTR_ERR(tc);
359 tc = NULL;
360 goto error;
361 }
362
363 err = p9_client_rpc(clnt, tc, &rc);
364 if (err) {
365 if (rc && rc->id == P9_RWALK)
366 goto clunk_fid;
367 else
368 goto error;
369 }
370
371 if (rc->params.rwalk.nwqid != nwname) {
372 err = -ENOENT;
373 goto clunk_fid;
374 }
375
376 if (nwname)
377 memmove(&fid->qid,
378 &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
379 sizeof(struct p9_qid));
380 else
381 fid->qid = oldfid->qid;
382
383 kfree(tc);
384 kfree(rc);
385 return fid;
386
387 clunk_fid:
388 kfree(tc);
389 kfree(rc);
390 rc = NULL;
391 tc = p9_create_tclunk(fid->fid);
392 if (IS_ERR(tc)) {
393 err = PTR_ERR(tc);
394 tc = NULL;
395 goto error;
396 }
397
398 p9_client_rpc(clnt, tc, &rc);
399
400 error:
401 kfree(tc);
402 kfree(rc);
403 if (fid && (fid != oldfid))
404 p9_fid_destroy(fid);
405
406 return ERR_PTR(err);
407 }
408 EXPORT_SYMBOL(p9_client_walk);
409
410 int p9_client_open(struct p9_fid *fid, int mode)
411 {
412 int err;
413 struct p9_fcall *tc, *rc;
414 struct p9_client *clnt;
415
416 P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
417 err = 0;
418 tc = NULL;
419 rc = NULL;
420 clnt = fid->clnt;
421
422 if (fid->mode != -1)
423 return -EINVAL;
424
425 tc = p9_create_topen(fid->fid, mode);
426 if (IS_ERR(tc)) {
427 err = PTR_ERR(tc);
428 tc = NULL;
429 goto done;
430 }
431
432 err = p9_client_rpc(clnt, tc, &rc);
433 if (err)
434 goto done;
435
436 fid->mode = mode;
437 fid->iounit = rc->params.ropen.iounit;
438
439 done:
440 kfree(tc);
441 kfree(rc);
442 return err;
443 }
444 EXPORT_SYMBOL(p9_client_open);
445
446 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
447 char *extension)
448 {
449 int err;
450 struct p9_fcall *tc, *rc;
451 struct p9_client *clnt;
452
453 P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
454 name, perm, mode);
455 err = 0;
456 tc = NULL;
457 rc = NULL;
458 clnt = fid->clnt;
459
460 if (fid->mode != -1)
461 return -EINVAL;
462
463 tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
464 clnt->dotu);
465 if (IS_ERR(tc)) {
466 err = PTR_ERR(tc);
467 tc = NULL;
468 goto done;
469 }
470
471 err = p9_client_rpc(clnt, tc, &rc);
472 if (err)
473 goto done;
474
475 fid->mode = mode;
476 fid->iounit = rc->params.ropen.iounit;
477
478 done:
479 kfree(tc);
480 kfree(rc);
481 return err;
482 }
483 EXPORT_SYMBOL(p9_client_fcreate);
484
485 int p9_client_clunk(struct p9_fid *fid)
486 {
487 int err;
488 struct p9_fcall *tc, *rc;
489 struct p9_client *clnt;
490
491 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
492 err = 0;
493 tc = NULL;
494 rc = NULL;
495 clnt = fid->clnt;
496
497 tc = p9_create_tclunk(fid->fid);
498 if (IS_ERR(tc)) {
499 err = PTR_ERR(tc);
500 tc = NULL;
501 goto done;
502 }
503
504 err = p9_client_rpc(clnt, tc, &rc);
505 if (err)
506 goto done;
507
508 p9_fid_destroy(fid);
509
510 done:
511 kfree(tc);
512 kfree(rc);
513 return err;
514 }
515 EXPORT_SYMBOL(p9_client_clunk);
516
517 int p9_client_remove(struct p9_fid *fid)
518 {
519 int err;
520 struct p9_fcall *tc, *rc;
521 struct p9_client *clnt;
522
523 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
524 err = 0;
525 tc = NULL;
526 rc = NULL;
527 clnt = fid->clnt;
528
529 tc = p9_create_tremove(fid->fid);
530 if (IS_ERR(tc)) {
531 err = PTR_ERR(tc);
532 tc = NULL;
533 goto done;
534 }
535
536 err = p9_client_rpc(clnt, tc, &rc);
537 if (err)
538 goto done;
539
540 p9_fid_destroy(fid);
541
542 done:
543 kfree(tc);
544 kfree(rc);
545 return err;
546 }
547 EXPORT_SYMBOL(p9_client_remove);
548
549 int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
550 {
551 int err, n, rsize, total;
552 struct p9_fcall *tc, *rc;
553 struct p9_client *clnt;
554
555 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
556 (long long unsigned) offset, count);
557 err = 0;
558 tc = NULL;
559 rc = NULL;
560 clnt = fid->clnt;
561 total = 0;
562
563 rsize = fid->iounit;
564 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
565 rsize = clnt->msize - P9_IOHDRSZ;
566
567 do {
568 if (count < rsize)
569 rsize = count;
570
571 tc = p9_create_tread(fid->fid, offset, rsize);
572 if (IS_ERR(tc)) {
573 err = PTR_ERR(tc);
574 tc = NULL;
575 goto error;
576 }
577
578 err = p9_client_rpc(clnt, tc, &rc);
579 if (err)
580 goto error;
581
582 n = rc->params.rread.count;
583 if (n > count)
584 n = count;
585
586 memmove(data, rc->params.rread.data, n);
587 count -= n;
588 data += n;
589 offset += n;
590 total += n;
591 kfree(tc);
592 tc = NULL;
593 kfree(rc);
594 rc = NULL;
595 } while (count > 0 && n == rsize);
596
597 return total;
598
599 error:
600 kfree(tc);
601 kfree(rc);
602 return err;
603 }
604 EXPORT_SYMBOL(p9_client_read);
605
606 int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
607 {
608 int err, n, rsize, total;
609 struct p9_fcall *tc, *rc;
610 struct p9_client *clnt;
611
612 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
613 (long long unsigned) offset, count);
614 err = 0;
615 tc = NULL;
616 rc = NULL;
617 clnt = fid->clnt;
618 total = 0;
619
620 rsize = fid->iounit;
621 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
622 rsize = clnt->msize - P9_IOHDRSZ;
623
624 do {
625 if (count < rsize)
626 rsize = count;
627
628 tc = p9_create_twrite(fid->fid, offset, rsize, data);
629 if (IS_ERR(tc)) {
630 err = PTR_ERR(tc);
631 tc = NULL;
632 goto error;
633 }
634
635 err = p9_client_rpc(clnt, tc, &rc);
636 if (err)
637 goto error;
638
639 n = rc->params.rread.count;
640 count -= n;
641 data += n;
642 offset += n;
643 total += n;
644 kfree(tc);
645 tc = NULL;
646 kfree(rc);
647 rc = NULL;
648 } while (count > 0);
649
650 return total;
651
652 error:
653 kfree(tc);
654 kfree(rc);
655 return err;
656 }
657 EXPORT_SYMBOL(p9_client_write);
658
659 int
660 p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
661 {
662 int err, n, rsize, total;
663 struct p9_fcall *tc, *rc;
664 struct p9_client *clnt;
665
666 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
667 (long long unsigned) offset, count);
668 err = 0;
669 tc = NULL;
670 rc = NULL;
671 clnt = fid->clnt;
672 total = 0;
673
674 rsize = fid->iounit;
675 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
676 rsize = clnt->msize - P9_IOHDRSZ;
677
678 do {
679 if (count < rsize)
680 rsize = count;
681
682 tc = p9_create_tread(fid->fid, offset, rsize);
683 if (IS_ERR(tc)) {
684 err = PTR_ERR(tc);
685 tc = NULL;
686 goto error;
687 }
688
689 err = p9_client_rpc(clnt, tc, &rc);
690 if (err)
691 goto error;
692
693 n = rc->params.rread.count;
694 if (n > count)
695 n = count;
696
697 err = copy_to_user(data, rc->params.rread.data, n);
698 if (err) {
699 err = -EFAULT;
700 goto error;
701 }
702
703 count -= n;
704 data += n;
705 offset += n;
706 total += n;
707 kfree(tc);
708 tc = NULL;
709 kfree(rc);
710 rc = NULL;
711 } while (count > 0 && n == rsize);
712
713 return total;
714
715 error:
716 kfree(tc);
717 kfree(rc);
718 return err;
719 }
720 EXPORT_SYMBOL(p9_client_uread);
721
722 int
723 p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
724 u32 count)
725 {
726 int err, n, rsize, total;
727 struct p9_fcall *tc, *rc;
728 struct p9_client *clnt;
729
730 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
731 (long long unsigned) offset, count);
732 err = 0;
733 tc = NULL;
734 rc = NULL;
735 clnt = fid->clnt;
736 total = 0;
737
738 rsize = fid->iounit;
739 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
740 rsize = clnt->msize - P9_IOHDRSZ;
741
742 do {
743 if (count < rsize)
744 rsize = count;
745
746 tc = p9_create_twrite_u(fid->fid, offset, rsize, data);
747 if (IS_ERR(tc)) {
748 err = PTR_ERR(tc);
749 tc = NULL;
750 goto error;
751 }
752
753 err = p9_client_rpc(clnt, tc, &rc);
754 if (err)
755 goto error;
756
757 n = rc->params.rread.count;
758 count -= n;
759 data += n;
760 offset += n;
761 total += n;
762 kfree(tc);
763 tc = NULL;
764 kfree(rc);
765 rc = NULL;
766 } while (count > 0);
767
768 return total;
769
770 error:
771 kfree(tc);
772 kfree(rc);
773 return err;
774 }
775 EXPORT_SYMBOL(p9_client_uwrite);
776
777 int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
778 {
779 int n, total;
780
781 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
782 (long long unsigned) offset, count);
783 n = 0;
784 total = 0;
785 while (count) {
786 n = p9_client_read(fid, data, offset, count);
787 if (n <= 0)
788 break;
789
790 data += n;
791 offset += n;
792 count -= n;
793 total += n;
794 }
795
796 if (n < 0)
797 total = n;
798
799 return total;
800 }
801 EXPORT_SYMBOL(p9_client_readn);
802
803 struct p9_stat *p9_client_stat(struct p9_fid *fid)
804 {
805 int err;
806 struct p9_fcall *tc, *rc;
807 struct p9_client *clnt;
808 struct p9_stat *ret;
809
810 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
811 err = 0;
812 tc = NULL;
813 rc = NULL;
814 ret = NULL;
815 clnt = fid->clnt;
816
817 tc = p9_create_tstat(fid->fid);
818 if (IS_ERR(tc)) {
819 err = PTR_ERR(tc);
820 tc = NULL;
821 goto error;
822 }
823
824 err = p9_client_rpc(clnt, tc, &rc);
825 if (err)
826 goto error;
827
828 ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
829 if (IS_ERR(ret)) {
830 err = PTR_ERR(ret);
831 ret = NULL;
832 goto error;
833 }
834
835 kfree(tc);
836 kfree(rc);
837 return ret;
838
839 error:
840 kfree(tc);
841 kfree(rc);
842 kfree(ret);
843 return ERR_PTR(err);
844 }
845 EXPORT_SYMBOL(p9_client_stat);
846
847 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
848 {
849 int err;
850 struct p9_fcall *tc, *rc;
851 struct p9_client *clnt;
852
853 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
854 err = 0;
855 tc = NULL;
856 rc = NULL;
857 clnt = fid->clnt;
858
859 tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
860 if (IS_ERR(tc)) {
861 err = PTR_ERR(tc);
862 tc = NULL;
863 goto done;
864 }
865
866 err = p9_client_rpc(clnt, tc, &rc);
867
868 done:
869 kfree(tc);
870 kfree(rc);
871 return err;
872 }
873 EXPORT_SYMBOL(p9_client_wstat);
874
875 struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
876 {
877 int err, n, m;
878 struct p9_fcall *tc, *rc;
879 struct p9_client *clnt;
880 struct p9_stat st, *ret;
881
882 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid,
883 (long long unsigned) offset);
884 err = 0;
885 tc = NULL;
886 rc = NULL;
887 ret = NULL;
888 clnt = fid->clnt;
889
890 /* if the offset is below or above the current response, free it */
891 if (offset < fid->rdir_fpos || (fid->rdir_fcall &&
892 offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) {
893 fid->rdir_pos = 0;
894 if (fid->rdir_fcall)
895 fid->rdir_fpos += fid->rdir_fcall->params.rread.count;
896
897 kfree(fid->rdir_fcall);
898 fid->rdir_fcall = NULL;
899 if (offset < fid->rdir_fpos)
900 fid->rdir_fpos = 0;
901 }
902
903 if (!fid->rdir_fcall) {
904 n = fid->iounit;
905 if (!n || n > clnt->msize-P9_IOHDRSZ)
906 n = clnt->msize - P9_IOHDRSZ;
907
908 while (1) {
909 if (fid->rdir_fcall) {
910 fid->rdir_fpos +=
911 fid->rdir_fcall->params.rread.count;
912 kfree(fid->rdir_fcall);
913 fid->rdir_fcall = NULL;
914 }
915
916 tc = p9_create_tread(fid->fid, fid->rdir_fpos, n);
917 if (IS_ERR(tc)) {
918 err = PTR_ERR(tc);
919 tc = NULL;
920 goto error;
921 }
922
923 err = p9_client_rpc(clnt, tc, &rc);
924 if (err)
925 goto error;
926
927 n = rc->params.rread.count;
928 if (n == 0)
929 goto done;
930
931 fid->rdir_fcall = rc;
932 rc = NULL;
933 if (offset >= fid->rdir_fpos &&
934 offset < fid->rdir_fpos+n)
935 break;
936 }
937
938 fid->rdir_pos = 0;
939 }
940
941 m = offset - fid->rdir_fpos;
942 if (m < 0)
943 goto done;
944
945 n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m,
946 fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu);
947
948 if (!n) {
949 err = -EIO;
950 goto error;
951 }
952
953 fid->rdir_pos += n;
954 st.size = n;
955 ret = p9_clone_stat(&st, clnt->dotu);
956 if (IS_ERR(ret)) {
957 err = PTR_ERR(ret);
958 ret = NULL;
959 goto error;
960 }
961
962 done:
963 kfree(tc);
964 kfree(rc);
965 return ret;
966
967 error:
968 kfree(tc);
969 kfree(rc);
970 kfree(ret);
971 return ERR_PTR(err);
972 }
973 EXPORT_SYMBOL(p9_client_dirread);
974
975 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
976 {
977 int n;
978 char *p;
979 struct p9_stat *ret;
980
981 n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
982 st->muid.len;
983
984 if (dotu)
985 n += st->extension.len;
986
987 ret = kmalloc(n, GFP_KERNEL);
988 if (!ret)
989 return ERR_PTR(-ENOMEM);
990
991 memmove(ret, st, sizeof(struct p9_stat));
992 p = ((char *) ret) + sizeof(struct p9_stat);
993 memmove(p, st->name.str, st->name.len);
994 ret->name.str = p;
995 p += st->name.len;
996 memmove(p, st->uid.str, st->uid.len);
997 ret->uid.str = p;
998 p += st->uid.len;
999 memmove(p, st->gid.str, st->gid.len);
1000 ret->gid.str = p;
1001 p += st->gid.len;
1002 memmove(p, st->muid.str, st->muid.len);
1003 ret->muid.str = p;
1004 p += st->muid.len;
1005
1006 if (dotu) {
1007 memmove(p, st->extension.str, st->extension.len);
1008 ret->extension.str = p;
1009 p += st->extension.len;
1010 }
1011
1012 return ret;
1013 }
1014
1015 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
1016 {
1017 int err;
1018 struct p9_fid *fid;
1019
1020 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1021 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
1022 if (!fid)
1023 return ERR_PTR(-ENOMEM);
1024
1025 fid->fid = p9_idpool_get(clnt->fidpool);
1026 if (fid->fid < 0) {
1027 err = -ENOSPC;
1028 goto error;
1029 }
1030
1031 memset(&fid->qid, 0, sizeof(struct p9_qid));
1032 fid->mode = -1;
1033 fid->rdir_fpos = 0;
1034 fid->rdir_pos = 0;
1035 fid->rdir_fcall = NULL;
1036 fid->uid = current->fsuid;
1037 fid->clnt = clnt;
1038 fid->aux = NULL;
1039
1040 spin_lock(&clnt->lock);
1041 list_add(&fid->flist, &clnt->fidlist);
1042 spin_unlock(&clnt->lock);
1043
1044 return fid;
1045
1046 error:
1047 kfree(fid);
1048 return ERR_PTR(err);
1049 }
1050
1051 static void p9_fid_destroy(struct p9_fid *fid)
1052 {
1053 struct p9_client *clnt;
1054
1055 P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
1056 clnt = fid->clnt;
1057 p9_idpool_put(fid->fid, clnt->fidpool);
1058 spin_lock(&clnt->lock);
1059 list_del(&fid->flist);
1060 spin_unlock(&clnt->lock);
1061 kfree(fid->rdir_fcall);
1062 kfree(fid);
1063 }
1064
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