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V4L/DVB: v4l2-ioctl: integer overflow in video_usercopy()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / 9p / client.c
bloba0c407efa41aa320ec794fc92634d317d0acd6d2
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/client.h>
37 #include <net/9p/transport.h>
38 #include "protocol.h"
39
40 /*
41 * Client Option Parsing (code inspired by NFS code)
42 * - a little lazy - parse all client options
43 */
44
45 enum {
46 Opt_msize,
47 Opt_trans,
48 Opt_legacy,
49 Opt_err,
50 };
51
52 static const match_table_t tokens = {
53 {Opt_msize, "msize=%u"},
54 {Opt_legacy, "noextend"},
55 {Opt_trans, "trans=%s"},
56 {Opt_err, NULL},
57 };
58
59 static struct p9_req_t *
60 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
61
62 /**
63 * parse_options - parse mount options into client structure
64 * @opts: options string passed from mount
65 * @clnt: existing v9fs client information
66 *
67 * Return 0 upon success, -ERRNO upon failure
68 */
69
70 static int parse_opts(char *opts, struct p9_client *clnt)
71 {
72 char *options;
73 char *p;
74 substring_t args[MAX_OPT_ARGS];
75 int option;
76 int ret = 0;
77
78 clnt->dotu = 1;
79 clnt->msize = 8192;
80
81 if (!opts)
82 return 0;
83
84 options = kstrdup(opts, GFP_KERNEL);
85 if (!options) {
86 P9_DPRINTK(P9_DEBUG_ERROR,
87 "failed to allocate copy of option string\n");
88 return -ENOMEM;
89 }
90
91 while ((p = strsep(&options, ",")) != NULL) {
92 int token;
93 if (!*p)
94 continue;
95 token = match_token(p, tokens, args);
96 if (token < Opt_trans) {
97 int r = match_int(&args[0], &option);
98 if (r < 0) {
99 P9_DPRINTK(P9_DEBUG_ERROR,
100 "integer field, but no integer?\n");
101 ret = r;
102 continue;
103 }
104 }
105 switch (token) {
106 case Opt_msize:
107 clnt->msize = option;
108 break;
109 case Opt_trans:
110 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
111 break;
112 case Opt_legacy:
113 clnt->dotu = 0;
114 break;
115 default:
116 continue;
117 }
118 }
119
120 kfree(options);
121 return ret;
122 }
123
124 /**
125 * p9_tag_alloc - lookup/allocate a request by tag
126 * @c: client session to lookup tag within
127 * @tag: numeric id for transaction
128 *
129 * this is a simple array lookup, but will grow the
130 * request_slots as necessary to accomodate transaction
131 * ids which did not previously have a slot.
132 *
133 * this code relies on the client spinlock to manage locks, its
134 * possible we should switch to something else, but I'd rather
135 * stick with something low-overhead for the common case.
136 *
137 */
138
139 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
140 {
141 unsigned long flags;
142 int row, col;
143 struct p9_req_t *req;
144
145 /* This looks up the original request by tag so we know which
146 * buffer to read the data into */
147 tag++;
148
149 if (tag >= c->max_tag) {
150 spin_lock_irqsave(&c->lock, flags);
151 /* check again since original check was outside of lock */
152 while (tag >= c->max_tag) {
153 row = (tag / P9_ROW_MAXTAG);
154 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
155 sizeof(struct p9_req_t), GFP_ATOMIC);
156
157 if (!c->reqs[row]) {
158 printk(KERN_ERR "Couldn't grow tag array\n");
159 spin_unlock_irqrestore(&c->lock, flags);
160 return ERR_PTR(-ENOMEM);
161 }
162 for (col = 0; col < P9_ROW_MAXTAG; col++) {
163 c->reqs[row][col].status = REQ_STATUS_IDLE;
164 c->reqs[row][col].tc = NULL;
165 }
166 c->max_tag += P9_ROW_MAXTAG;
167 }
168 spin_unlock_irqrestore(&c->lock, flags);
169 }
170 row = tag / P9_ROW_MAXTAG;
171 col = tag % P9_ROW_MAXTAG;
172
173 req = &c->reqs[row][col];
174 if (!req->tc) {
175 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
176 if (!req->wq) {
177 printk(KERN_ERR "Couldn't grow tag array\n");
178 return ERR_PTR(-ENOMEM);
179 }
180 init_waitqueue_head(req->wq);
181 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
182 GFP_KERNEL);
183 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
184 GFP_KERNEL);
185 if ((!req->tc) || (!req->rc)) {
186 printk(KERN_ERR "Couldn't grow tag array\n");
187 kfree(req->tc);
188 kfree(req->rc);
189 kfree(req->wq);
190 req->tc = req->rc = NULL;
191 req->wq = NULL;
192 return ERR_PTR(-ENOMEM);
193 }
194 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
195 req->tc->capacity = c->msize;
196 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
197 req->rc->capacity = c->msize;
198 }
199
200 p9pdu_reset(req->tc);
201 p9pdu_reset(req->rc);
202
203 req->tc->tag = tag-1;
204 req->status = REQ_STATUS_ALLOC;
205
206 return &c->reqs[row][col];
207 }
208
209 /**
210 * p9_tag_lookup - lookup a request by tag
211 * @c: client session to lookup tag within
212 * @tag: numeric id for transaction
213 *
214 */
215
216 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
217 {
218 int row, col;
219
220 /* This looks up the original request by tag so we know which
221 * buffer to read the data into */
222 tag++;
223
224 if(tag >= c->max_tag)
225 return NULL;
226
227 row = tag / P9_ROW_MAXTAG;
228 col = tag % P9_ROW_MAXTAG;
229
230 return &c->reqs[row][col];
231 }
232 EXPORT_SYMBOL(p9_tag_lookup);
233
234 /**
235 * p9_tag_init - setup tags structure and contents
236 * @c: v9fs client struct
237 *
238 * This initializes the tags structure for each client instance.
239 *
240 */
241
242 static int p9_tag_init(struct p9_client *c)
243 {
244 int err = 0;
245
246 c->tagpool = p9_idpool_create();
247 if (IS_ERR(c->tagpool)) {
248 err = PTR_ERR(c->tagpool);
249 c->tagpool = NULL;
250 goto error;
251 }
252
253 p9_idpool_get(c->tagpool); /* reserve tag 0 */
254
255 c->max_tag = 0;
256 error:
257 return err;
258 }
259
260 /**
261 * p9_tag_cleanup - cleans up tags structure and reclaims resources
262 * @c: v9fs client struct
263 *
264 * This frees resources associated with the tags structure
265 *
266 */
267 static void p9_tag_cleanup(struct p9_client *c)
268 {
269 int row, col;
270
271 /* check to insure all requests are idle */
272 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
273 for (col = 0; col < P9_ROW_MAXTAG; col++) {
274 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
275 P9_DPRINTK(P9_DEBUG_MUX,
276 "Attempting to cleanup non-free tag %d,%d\n",
277 row, col);
278 /* TODO: delay execution of cleanup */
279 return;
280 }
281 }
282 }
283
284 if (c->tagpool)
285 p9_idpool_destroy(c->tagpool);
286
287 /* free requests associated with tags */
288 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
289 for (col = 0; col < P9_ROW_MAXTAG; col++) {
290 kfree(c->reqs[row][col].wq);
291 kfree(c->reqs[row][col].tc);
292 kfree(c->reqs[row][col].rc);
293 }
294 kfree(c->reqs[row]);
295 }
296 c->max_tag = 0;
297 }
298
299 /**
300 * p9_free_req - free a request and clean-up as necessary
301 * c: client state
302 * r: request to release
303 *
304 */
305
306 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
307 {
308 int tag = r->tc->tag;
309 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
310
311 r->status = REQ_STATUS_IDLE;
312 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
313 p9_idpool_put(tag, c->tagpool);
314 }
315
316 /**
317 * p9_client_cb - call back from transport to client
318 * c: client state
319 * req: request received
320 *
321 */
322 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
323 {
324 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
325 wake_up(req->wq);
326 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
327 }
328 EXPORT_SYMBOL(p9_client_cb);
329
330 /**
331 * p9_parse_header - parse header arguments out of a packet
332 * @pdu: packet to parse
333 * @size: size of packet
334 * @type: type of request
335 * @tag: tag of packet
336 * @rewind: set if we need to rewind offset afterwards
337 */
338
339 int
340 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
341 int rewind)
342 {
343 int8_t r_type;
344 int16_t r_tag;
345 int32_t r_size;
346 int offset = pdu->offset;
347 int err;
348
349 pdu->offset = 0;
350 if (pdu->size == 0)
351 pdu->size = 7;
352
353 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
354 if (err)
355 goto rewind_and_exit;
356
357 pdu->size = r_size;
358 pdu->id = r_type;
359 pdu->tag = r_tag;
360
361 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
362 pdu->id, pdu->tag);
363
364 if (type)
365 *type = r_type;
366 if (tag)
367 *tag = r_tag;
368 if (size)
369 *size = r_size;
370
371
372 rewind_and_exit:
373 if (rewind)
374 pdu->offset = offset;
375 return err;
376 }
377 EXPORT_SYMBOL(p9_parse_header);
378
379 /**
380 * p9_check_errors - check 9p packet for error return and process it
381 * @c: current client instance
382 * @req: request to parse and check for error conditions
383 *
384 * returns error code if one is discovered, otherwise returns 0
385 *
386 * this will have to be more complicated if we have multiple
387 * error packet types
388 */
389
390 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
391 {
392 int8_t type;
393 int err;
394
395 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
396 if (err) {
397 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
398 return err;
399 }
400
401 if (type == P9_RERROR) {
402 int ecode;
403 char *ename;
404
405 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
406 if (err) {
407 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
408 err);
409 return err;
410 }
411
412 if (c->dotu)
413 err = -ecode;
414
415 if (!err || !IS_ERR_VALUE(err))
416 err = p9_errstr2errno(ename, strlen(ename));
417
418 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
419
420 kfree(ename);
421 } else
422 err = 0;
423
424 return err;
425 }
426
427 /**
428 * p9_client_flush - flush (cancel) a request
429 * @c: client state
430 * @oldreq: request to cancel
431 *
432 * This sents a flush for a particular requests and links
433 * the flush request to the original request. The current
434 * code only supports a single flush request although the protocol
435 * allows for multiple flush requests to be sent for a single request.
436 *
437 */
438
439 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
440 {
441 struct p9_req_t *req;
442 int16_t oldtag;
443 int err;
444
445 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
446 if (err)
447 return err;
448
449 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
450
451 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
452 if (IS_ERR(req))
453 return PTR_ERR(req);
454
455
456 /* if we haven't received a response for oldreq,
457 remove it from the list. */
458 spin_lock(&c->lock);
459 if (oldreq->status == REQ_STATUS_FLSH)
460 list_del(&oldreq->req_list);
461 spin_unlock(&c->lock);
462
463 p9_free_req(c, req);
464 return 0;
465 }
466
467 /**
468 * p9_client_rpc - issue a request and wait for a response
469 * @c: client session
470 * @type: type of request
471 * @fmt: protocol format string (see protocol.c)
472 *
473 * Returns request structure (which client must free using p9_free_req)
474 */
475
476 static struct p9_req_t *
477 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
478 {
479 va_list ap;
480 int tag, err;
481 struct p9_req_t *req;
482 unsigned long flags;
483 int sigpending;
484
485 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
486
487 if (c->status != Connected)
488 return ERR_PTR(-EIO);
489
490 if (signal_pending(current)) {
491 sigpending = 1;
492 clear_thread_flag(TIF_SIGPENDING);
493 } else
494 sigpending = 0;
495
496 tag = P9_NOTAG;
497 if (type != P9_TVERSION) {
498 tag = p9_idpool_get(c->tagpool);
499 if (tag < 0)
500 return ERR_PTR(-ENOMEM);
501 }
502
503 req = p9_tag_alloc(c, tag);
504 if (IS_ERR(req))
505 return req;
506
507 /* marshall the data */
508 p9pdu_prepare(req->tc, tag, type);
509 va_start(ap, fmt);
510 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
511 va_end(ap);
512 p9pdu_finalize(req->tc);
513
514 err = c->trans_mod->request(c, req);
515 if (err < 0) {
516 c->status = Disconnected;
517 goto reterr;
518 }
519
520 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
521 err = wait_event_interruptible(*req->wq,
522 req->status >= REQ_STATUS_RCVD);
523 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
524 req->wq, tag, err);
525
526 if (req->status == REQ_STATUS_ERROR) {
527 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
528 err = req->t_err;
529 }
530
531 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
532 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
533 sigpending = 1;
534 clear_thread_flag(TIF_SIGPENDING);
535
536 if (c->trans_mod->cancel(c, req))
537 p9_client_flush(c, req);
538
539 /* if we received the response anyway, don't signal error */
540 if (req->status == REQ_STATUS_RCVD)
541 err = 0;
542 }
543
544 if (sigpending) {
545 spin_lock_irqsave(&current->sighand->siglock, flags);
546 recalc_sigpending();
547 spin_unlock_irqrestore(&current->sighand->siglock, flags);
548 }
549
550 if (err < 0)
551 goto reterr;
552
553 err = p9_check_errors(c, req);
554 if (!err) {
555 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
556 return req;
557 }
558
559 reterr:
560 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
561 err);
562 p9_free_req(c, req);
563 return ERR_PTR(err);
564 }
565
566 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
567 {
568 int ret;
569 struct p9_fid *fid;
570 unsigned long flags;
571
572 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
573 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
574 if (!fid)
575 return ERR_PTR(-ENOMEM);
576
577 ret = p9_idpool_get(clnt->fidpool);
578 if (ret < 0) {
579 ret = -ENOSPC;
580 goto error;
581 }
582 fid->fid = ret;
583
584 memset(&fid->qid, 0, sizeof(struct p9_qid));
585 fid->mode = -1;
586 fid->uid = current_fsuid();
587 fid->clnt = clnt;
588 fid->rdir = NULL;
589 spin_lock_irqsave(&clnt->lock, flags);
590 list_add(&fid->flist, &clnt->fidlist);
591 spin_unlock_irqrestore(&clnt->lock, flags);
592
593 return fid;
594
595 error:
596 kfree(fid);
597 return ERR_PTR(ret);
598 }
599
600 static void p9_fid_destroy(struct p9_fid *fid)
601 {
602 struct p9_client *clnt;
603 unsigned long flags;
604
605 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
606 clnt = fid->clnt;
607 p9_idpool_put(fid->fid, clnt->fidpool);
608 spin_lock_irqsave(&clnt->lock, flags);
609 list_del(&fid->flist);
610 spin_unlock_irqrestore(&clnt->lock, flags);
611 kfree(fid->rdir);
612 kfree(fid);
613 }
614
615 int p9_client_version(struct p9_client *c)
616 {
617 int err = 0;
618 struct p9_req_t *req;
619 char *version;
620 int msize;
621
622 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
623 c->msize, c->dotu);
624 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
625 c->dotu ? "9P2000.u" : "9P2000");
626 if (IS_ERR(req))
627 return PTR_ERR(req);
628
629 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
630 if (err) {
631 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
632 p9pdu_dump(1, req->rc);
633 goto error;
634 }
635
636 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
637 if (!memcmp(version, "9P2000.u", 8))
638 c->dotu = 1;
639 else if (!memcmp(version, "9P2000", 6))
640 c->dotu = 0;
641 else {
642 err = -EREMOTEIO;
643 goto error;
644 }
645
646 if (msize < c->msize)
647 c->msize = msize;
648
649 error:
650 kfree(version);
651 p9_free_req(c, req);
652
653 return err;
654 }
655 EXPORT_SYMBOL(p9_client_version);
656
657 struct p9_client *p9_client_create(const char *dev_name, char *options)
658 {
659 int err;
660 struct p9_client *clnt;
661
662 err = 0;
663 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
664 if (!clnt)
665 return ERR_PTR(-ENOMEM);
666
667 clnt->trans_mod = NULL;
668 clnt->trans = NULL;
669 spin_lock_init(&clnt->lock);
670 INIT_LIST_HEAD(&clnt->fidlist);
671 clnt->fidpool = p9_idpool_create();
672 if (IS_ERR(clnt->fidpool)) {
673 err = PTR_ERR(clnt->fidpool);
674 clnt->fidpool = NULL;
675 goto error;
676 }
677
678 p9_tag_init(clnt);
679
680 err = parse_opts(options, clnt);
681 if (err < 0)
682 goto error;
683
684 if (!clnt->trans_mod)
685 clnt->trans_mod = v9fs_get_default_trans();
686
687 if (clnt->trans_mod == NULL) {
688 err = -EPROTONOSUPPORT;
689 P9_DPRINTK(P9_DEBUG_ERROR,
690 "No transport defined or default transport\n");
691 goto error;
692 }
693
694 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
695 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
696
697 err = clnt->trans_mod->create(clnt, dev_name, options);
698 if (err)
699 goto error;
700
701 if (clnt->msize > clnt->trans_mod->maxsize)
702 clnt->msize = clnt->trans_mod->maxsize;
703
704 err = p9_client_version(clnt);
705 if (err)
706 goto error;
707
708 return clnt;
709
710 error:
711 p9_client_destroy(clnt);
712 return ERR_PTR(err);
713 }
714 EXPORT_SYMBOL(p9_client_create);
715
716 void p9_client_destroy(struct p9_client *clnt)
717 {
718 struct p9_fid *fid, *fidptr;
719
720 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
721
722 if (clnt->trans_mod)
723 clnt->trans_mod->close(clnt);
724
725 v9fs_put_trans(clnt->trans_mod);
726
727 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
728 p9_fid_destroy(fid);
729
730 if (clnt->fidpool)
731 p9_idpool_destroy(clnt->fidpool);
732
733 p9_tag_cleanup(clnt);
734
735 kfree(clnt);
736 }
737 EXPORT_SYMBOL(p9_client_destroy);
738
739 void p9_client_disconnect(struct p9_client *clnt)
740 {
741 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
742 clnt->status = Disconnected;
743 }
744 EXPORT_SYMBOL(p9_client_disconnect);
745
746 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
747 char *uname, u32 n_uname, char *aname)
748 {
749 int err;
750 struct p9_req_t *req;
751 struct p9_fid *fid;
752 struct p9_qid qid;
753
754 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
755 afid ? afid->fid : -1, uname, aname);
756 err = 0;
757
758 fid = p9_fid_create(clnt);
759 if (IS_ERR(fid)) {
760 err = PTR_ERR(fid);
761 fid = NULL;
762 goto error;
763 }
764
765 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
766 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
767 if (IS_ERR(req)) {
768 err = PTR_ERR(req);
769 goto error;
770 }
771
772 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
773 if (err) {
774 p9pdu_dump(1, req->rc);
775 p9_free_req(clnt, req);
776 goto error;
777 }
778
779 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
780 qid.type,
781 (unsigned long long)qid.path,
782 qid.version);
783
784 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
785
786 p9_free_req(clnt, req);
787 return fid;
788
789 error:
790 if (fid)
791 p9_fid_destroy(fid);
792 return ERR_PTR(err);
793 }
794 EXPORT_SYMBOL(p9_client_attach);
795
796 struct p9_fid *
797 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
798 {
799 int err;
800 struct p9_req_t *req;
801 struct p9_qid qid;
802 struct p9_fid *afid;
803
804 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
805 err = 0;
806
807 afid = p9_fid_create(clnt);
808 if (IS_ERR(afid)) {
809 err = PTR_ERR(afid);
810 afid = NULL;
811 goto error;
812 }
813
814 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
815 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
816 if (IS_ERR(req)) {
817 err = PTR_ERR(req);
818 goto error;
819 }
820
821 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
822 if (err) {
823 p9pdu_dump(1, req->rc);
824 p9_free_req(clnt, req);
825 goto error;
826 }
827
828 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
829 qid.type,
830 (unsigned long long)qid.path,
831 qid.version);
832
833 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
834 p9_free_req(clnt, req);
835 return afid;
836
837 error:
838 if (afid)
839 p9_fid_destroy(afid);
840 return ERR_PTR(err);
841 }
842 EXPORT_SYMBOL(p9_client_auth);
843
844 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
845 int clone)
846 {
847 int err;
848 struct p9_client *clnt;
849 struct p9_fid *fid;
850 struct p9_qid *wqids;
851 struct p9_req_t *req;
852 int16_t nwqids, count;
853
854 err = 0;
855 clnt = oldfid->clnt;
856 if (clone) {
857 fid = p9_fid_create(clnt);
858 if (IS_ERR(fid)) {
859 err = PTR_ERR(fid);
860 fid = NULL;
861 goto error;
862 }
863
864 fid->uid = oldfid->uid;
865 } else
866 fid = oldfid;
867
868
869 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
870 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
871
872 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
873 nwname, wnames);
874 if (IS_ERR(req)) {
875 err = PTR_ERR(req);
876 goto error;
877 }
878
879 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
880 if (err) {
881 p9pdu_dump(1, req->rc);
882 p9_free_req(clnt, req);
883 goto clunk_fid;
884 }
885 p9_free_req(clnt, req);
886
887 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
888
889 if (nwqids != nwname) {
890 err = -ENOENT;
891 goto clunk_fid;
892 }
893
894 for (count = 0; count < nwqids; count++)
895 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
896 count, wqids[count].type,
897 (unsigned long long)wqids[count].path,
898 wqids[count].version);
899
900 if (nwname)
901 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
902 else
903 fid->qid = oldfid->qid;
904
905 return fid;
906
907 clunk_fid:
908 p9_client_clunk(fid);
909 fid = NULL;
910
911 error:
912 if (fid && (fid != oldfid))
913 p9_fid_destroy(fid);
914
915 return ERR_PTR(err);
916 }
917 EXPORT_SYMBOL(p9_client_walk);
918
919 int p9_client_open(struct p9_fid *fid, int mode)
920 {
921 int err;
922 struct p9_client *clnt;
923 struct p9_req_t *req;
924 struct p9_qid qid;
925 int iounit;
926
927 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
928 err = 0;
929 clnt = fid->clnt;
930
931 if (fid->mode != -1)
932 return -EINVAL;
933
934 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
935 if (IS_ERR(req)) {
936 err = PTR_ERR(req);
937 goto error;
938 }
939
940 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
941 if (err) {
942 p9pdu_dump(1, req->rc);
943 goto free_and_error;
944 }
945
946 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
947 qid.type,
948 (unsigned long long)qid.path,
949 qid.version, iounit);
950
951 fid->mode = mode;
952 fid->iounit = iounit;
953
954 free_and_error:
955 p9_free_req(clnt, req);
956 error:
957 return err;
958 }
959 EXPORT_SYMBOL(p9_client_open);
960
961 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
962 char *extension)
963 {
964 int err;
965 struct p9_client *clnt;
966 struct p9_req_t *req;
967 struct p9_qid qid;
968 int iounit;
969
970 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
971 fid->fid, name, perm, mode);
972 err = 0;
973 clnt = fid->clnt;
974
975 if (fid->mode != -1)
976 return -EINVAL;
977
978 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
979 mode, extension);
980 if (IS_ERR(req)) {
981 err = PTR_ERR(req);
982 goto error;
983 }
984
985 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
986 if (err) {
987 p9pdu_dump(1, req->rc);
988 goto free_and_error;
989 }
990
991 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
992 qid.type,
993 (unsigned long long)qid.path,
994 qid.version, iounit);
995
996 fid->mode = mode;
997 fid->iounit = iounit;
998
999 free_and_error:
1000 p9_free_req(clnt, req);
1001 error:
1002 return err;
1003 }
1004 EXPORT_SYMBOL(p9_client_fcreate);
1005
1006 int p9_client_clunk(struct p9_fid *fid)
1007 {
1008 int err;
1009 struct p9_client *clnt;
1010 struct p9_req_t *req;
1011
1012 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1013 err = 0;
1014 clnt = fid->clnt;
1015
1016 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1017 if (IS_ERR(req)) {
1018 err = PTR_ERR(req);
1019 goto error;
1020 }
1021
1022 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1023
1024 p9_free_req(clnt, req);
1025 error:
1026 /*
1027 * Fid is not valid even after a failed clunk
1028 */
1029 p9_fid_destroy(fid);
1030 return err;
1031 }
1032 EXPORT_SYMBOL(p9_client_clunk);
1033
1034 int p9_client_remove(struct p9_fid *fid)
1035 {
1036 int err;
1037 struct p9_client *clnt;
1038 struct p9_req_t *req;
1039
1040 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1041 err = 0;
1042 clnt = fid->clnt;
1043
1044 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1045 if (IS_ERR(req)) {
1046 err = PTR_ERR(req);
1047 goto error;
1048 }
1049
1050 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1051
1052 p9_free_req(clnt, req);
1053 p9_fid_destroy(fid);
1054
1055 error:
1056 return err;
1057 }
1058 EXPORT_SYMBOL(p9_client_remove);
1059
1060 int
1061 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1062 u32 count)
1063 {
1064 int err, rsize, total;
1065 struct p9_client *clnt;
1066 struct p9_req_t *req;
1067 char *dataptr;
1068
1069 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1070 (long long unsigned) offset, count);
1071 err = 0;
1072 clnt = fid->clnt;
1073 total = 0;
1074
1075 rsize = fid->iounit;
1076 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1077 rsize = clnt->msize - P9_IOHDRSZ;
1078
1079 if (count < rsize)
1080 rsize = count;
1081
1082 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1083 if (IS_ERR(req)) {
1084 err = PTR_ERR(req);
1085 goto error;
1086 }
1087
1088 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1089 if (err) {
1090 p9pdu_dump(1, req->rc);
1091 goto free_and_error;
1092 }
1093
1094 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1095
1096 if (data) {
1097 memmove(data, dataptr, count);
1098 }
1099
1100 if (udata) {
1101 err = copy_to_user(udata, dataptr, count);
1102 if (err) {
1103 err = -EFAULT;
1104 goto free_and_error;
1105 }
1106 }
1107
1108 p9_free_req(clnt, req);
1109 return count;
1110
1111 free_and_error:
1112 p9_free_req(clnt, req);
1113 error:
1114 return err;
1115 }
1116 EXPORT_SYMBOL(p9_client_read);
1117
1118 int
1119 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1120 u64 offset, u32 count)
1121 {
1122 int err, rsize, total;
1123 struct p9_client *clnt;
1124 struct p9_req_t *req;
1125
1126 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1127 fid->fid, (long long unsigned) offset, count);
1128 err = 0;
1129 clnt = fid->clnt;
1130 total = 0;
1131
1132 rsize = fid->iounit;
1133 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1134 rsize = clnt->msize - P9_IOHDRSZ;
1135
1136 if (count < rsize)
1137 rsize = count;
1138 if (data)
1139 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1140 rsize, data);
1141 else
1142 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1143 rsize, udata);
1144 if (IS_ERR(req)) {
1145 err = PTR_ERR(req);
1146 goto error;
1147 }
1148
1149 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1150 if (err) {
1151 p9pdu_dump(1, req->rc);
1152 goto free_and_error;
1153 }
1154
1155 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1156
1157 p9_free_req(clnt, req);
1158 return count;
1159
1160 free_and_error:
1161 p9_free_req(clnt, req);
1162 error:
1163 return err;
1164 }
1165 EXPORT_SYMBOL(p9_client_write);
1166
1167 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1168 {
1169 int err;
1170 struct p9_client *clnt;
1171 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1172 struct p9_req_t *req;
1173 u16 ignored;
1174
1175 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1176
1177 if (!ret)
1178 return ERR_PTR(-ENOMEM);
1179
1180 err = 0;
1181 clnt = fid->clnt;
1182
1183 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1184 if (IS_ERR(req)) {
1185 err = PTR_ERR(req);
1186 goto error;
1187 }
1188
1189 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1190 if (err) {
1191 p9pdu_dump(1, req->rc);
1192 p9_free_req(clnt, req);
1193 goto error;
1194 }
1195
1196 P9_DPRINTK(P9_DEBUG_9P,
1197 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1198 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1199 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1200 "<<< uid=%d gid=%d n_muid=%d\n",
1201 ret->size, ret->type, ret->dev, ret->qid.type,
1202 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1203 ret->atime, ret->mtime, (unsigned long long)ret->length,
1204 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1205 ret->n_uid, ret->n_gid, ret->n_muid);
1206
1207 p9_free_req(clnt, req);
1208 return ret;
1209
1210 error:
1211 kfree(ret);
1212 return ERR_PTR(err);
1213 }
1214 EXPORT_SYMBOL(p9_client_stat);
1215
1216 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1217 {
1218 int ret;
1219
1220 /* size[2] type[2] dev[4] qid[13] */
1221 /* mode[4] atime[4] mtime[4] length[8]*/
1222 /* name[s] uid[s] gid[s] muid[s] */
1223 ret = 2+2+4+13+4+4+4+8+2+2+2+2;
1224
1225 if (wst->name)
1226 ret += strlen(wst->name);
1227 if (wst->uid)
1228 ret += strlen(wst->uid);
1229 if (wst->gid)
1230 ret += strlen(wst->gid);
1231 if (wst->muid)
1232 ret += strlen(wst->muid);
1233
1234 if (optional) {
1235 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1236 if (wst->extension)
1237 ret += strlen(wst->extension);
1238 }
1239
1240 return ret;
1241 }
1242
1243 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1244 {
1245 int err;
1246 struct p9_req_t *req;
1247 struct p9_client *clnt;
1248
1249 err = 0;
1250 clnt = fid->clnt;
1251 wst->size = p9_client_statsize(wst, clnt->dotu);
1252 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1253 P9_DPRINTK(P9_DEBUG_9P,
1254 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1255 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1256 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1257 " uid=%d gid=%d n_muid=%d\n",
1258 wst->size, wst->type, wst->dev, wst->qid.type,
1259 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1260 wst->atime, wst->mtime, (unsigned long long)wst->length,
1261 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1262 wst->n_uid, wst->n_gid, wst->n_muid);
1263
1264 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
1265 if (IS_ERR(req)) {
1266 err = PTR_ERR(req);
1267 goto error;
1268 }
1269
1270 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1271
1272 p9_free_req(clnt, req);
1273 error:
1274 return err;
1275 }
1276 EXPORT_SYMBOL(p9_client_wstat);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree