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x86, mce, AMD: Fix leaving freed data in a list
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / 9p / client.c
blob09d4f1e2e4a8cef1974929198e8df452597c40f6
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, *tmp_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 tmp_options = kstrdup(opts, GFP_KERNEL);
85 if (!tmp_options) {
86 P9_DPRINTK(P9_DEBUG_ERROR,
87 "failed to allocate copy of option string\n");
88 return -ENOMEM;
89 }
90 options = tmp_options;
91
92 while ((p = strsep(&options, ",")) != NULL) {
93 int token;
94 if (!*p)
95 continue;
96 token = match_token(p, tokens, args);
97 if (token < Opt_trans) {
98 int r = match_int(&args[0], &option);
99 if (r < 0) {
100 P9_DPRINTK(P9_DEBUG_ERROR,
101 "integer field, but no integer?\n");
102 ret = r;
103 continue;
104 }
105 }
106 switch (token) {
107 case Opt_msize:
108 clnt->msize = option;
109 break;
110 case Opt_trans:
111 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
112 if(clnt->trans_mod == NULL) {
113 P9_DPRINTK(P9_DEBUG_ERROR,
114 "Could not find request transport: %s\n",
115 (char *) &args[0]);
116 ret = -EINVAL;
117 goto free_and_return;
118 }
119 break;
120 case Opt_legacy:
121 clnt->dotu = 0;
122 break;
123 default:
124 continue;
125 }
126 }
127
128 free_and_return:
129 kfree(tmp_options);
130 return ret;
131 }
132
133 /**
134 * p9_tag_alloc - lookup/allocate a request by tag
135 * @c: client session to lookup tag within
136 * @tag: numeric id for transaction
137 *
138 * this is a simple array lookup, but will grow the
139 * request_slots as necessary to accomodate transaction
140 * ids which did not previously have a slot.
141 *
142 * this code relies on the client spinlock to manage locks, its
143 * possible we should switch to something else, but I'd rather
144 * stick with something low-overhead for the common case.
145 *
146 */
147
148 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
149 {
150 unsigned long flags;
151 int row, col;
152 struct p9_req_t *req;
153
154 /* This looks up the original request by tag so we know which
155 * buffer to read the data into */
156 tag++;
157
158 if (tag >= c->max_tag) {
159 spin_lock_irqsave(&c->lock, flags);
160 /* check again since original check was outside of lock */
161 while (tag >= c->max_tag) {
162 row = (tag / P9_ROW_MAXTAG);
163 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
164 sizeof(struct p9_req_t), GFP_ATOMIC);
165
166 if (!c->reqs[row]) {
167 printk(KERN_ERR "Couldn't grow tag array\n");
168 spin_unlock_irqrestore(&c->lock, flags);
169 return ERR_PTR(-ENOMEM);
170 }
171 for (col = 0; col < P9_ROW_MAXTAG; col++) {
172 c->reqs[row][col].status = REQ_STATUS_IDLE;
173 c->reqs[row][col].tc = NULL;
174 }
175 c->max_tag += P9_ROW_MAXTAG;
176 }
177 spin_unlock_irqrestore(&c->lock, flags);
178 }
179 row = tag / P9_ROW_MAXTAG;
180 col = tag % P9_ROW_MAXTAG;
181
182 req = &c->reqs[row][col];
183 if (!req->tc) {
184 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
185 if (!req->wq) {
186 printk(KERN_ERR "Couldn't grow tag array\n");
187 return ERR_PTR(-ENOMEM);
188 }
189 init_waitqueue_head(req->wq);
190 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
191 GFP_KERNEL);
192 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
193 GFP_KERNEL);
194 if ((!req->tc) || (!req->rc)) {
195 printk(KERN_ERR "Couldn't grow tag array\n");
196 kfree(req->tc);
197 kfree(req->rc);
198 kfree(req->wq);
199 req->tc = req->rc = NULL;
200 req->wq = NULL;
201 return ERR_PTR(-ENOMEM);
202 }
203 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
204 req->tc->capacity = c->msize;
205 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
206 req->rc->capacity = c->msize;
207 }
208
209 p9pdu_reset(req->tc);
210 p9pdu_reset(req->rc);
211
212 req->tc->tag = tag-1;
213 req->status = REQ_STATUS_ALLOC;
214
215 return &c->reqs[row][col];
216 }
217
218 /**
219 * p9_tag_lookup - lookup a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
222 *
223 */
224
225 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
226 {
227 int row, col;
228
229 /* This looks up the original request by tag so we know which
230 * buffer to read the data into */
231 tag++;
232
233 BUG_ON(tag >= c->max_tag);
234
235 row = tag / P9_ROW_MAXTAG;
236 col = tag % P9_ROW_MAXTAG;
237
238 return &c->reqs[row][col];
239 }
240 EXPORT_SYMBOL(p9_tag_lookup);
241
242 /**
243 * p9_tag_init - setup tags structure and contents
244 * @c: v9fs client struct
245 *
246 * This initializes the tags structure for each client instance.
247 *
248 */
249
250 static int p9_tag_init(struct p9_client *c)
251 {
252 int err = 0;
253
254 c->tagpool = p9_idpool_create();
255 if (IS_ERR(c->tagpool)) {
256 err = PTR_ERR(c->tagpool);
257 c->tagpool = NULL;
258 goto error;
259 }
260
261 p9_idpool_get(c->tagpool); /* reserve tag 0 */
262
263 c->max_tag = 0;
264 error:
265 return err;
266 }
267
268 /**
269 * p9_tag_cleanup - cleans up tags structure and reclaims resources
270 * @c: v9fs client struct
271 *
272 * This frees resources associated with the tags structure
273 *
274 */
275 static void p9_tag_cleanup(struct p9_client *c)
276 {
277 int row, col;
278
279 /* check to insure all requests are idle */
280 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
281 for (col = 0; col < P9_ROW_MAXTAG; col++) {
282 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
283 P9_DPRINTK(P9_DEBUG_MUX,
284 "Attempting to cleanup non-free tag %d,%d\n",
285 row, col);
286 /* TODO: delay execution of cleanup */
287 return;
288 }
289 }
290 }
291
292 if (c->tagpool)
293 p9_idpool_destroy(c->tagpool);
294
295 /* free requests associated with tags */
296 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
297 for (col = 0; col < P9_ROW_MAXTAG; col++) {
298 kfree(c->reqs[row][col].wq);
299 kfree(c->reqs[row][col].tc);
300 kfree(c->reqs[row][col].rc);
301 }
302 kfree(c->reqs[row]);
303 }
304 c->max_tag = 0;
305 }
306
307 /**
308 * p9_free_req - free a request and clean-up as necessary
309 * c: client state
310 * r: request to release
311 *
312 */
313
314 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
315 {
316 int tag = r->tc->tag;
317 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
318
319 r->status = REQ_STATUS_IDLE;
320 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
321 p9_idpool_put(tag, c->tagpool);
322 }
323
324 /**
325 * p9_client_cb - call back from transport to client
326 * c: client state
327 * req: request received
328 *
329 */
330 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
331 {
332 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
333 wake_up(req->wq);
334 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
335 }
336 EXPORT_SYMBOL(p9_client_cb);
337
338 /**
339 * p9_parse_header - parse header arguments out of a packet
340 * @pdu: packet to parse
341 * @size: size of packet
342 * @type: type of request
343 * @tag: tag of packet
344 * @rewind: set if we need to rewind offset afterwards
345 */
346
347 int
348 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
349 int rewind)
350 {
351 int8_t r_type;
352 int16_t r_tag;
353 int32_t r_size;
354 int offset = pdu->offset;
355 int err;
356
357 pdu->offset = 0;
358 if (pdu->size == 0)
359 pdu->size = 7;
360
361 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
362 if (err)
363 goto rewind_and_exit;
364
365 pdu->size = r_size;
366 pdu->id = r_type;
367 pdu->tag = r_tag;
368
369 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
370 pdu->id, pdu->tag);
371
372 if (type)
373 *type = r_type;
374 if (tag)
375 *tag = r_tag;
376 if (size)
377 *size = r_size;
378
379
380 rewind_and_exit:
381 if (rewind)
382 pdu->offset = offset;
383 return err;
384 }
385 EXPORT_SYMBOL(p9_parse_header);
386
387 /**
388 * p9_check_errors - check 9p packet for error return and process it
389 * @c: current client instance
390 * @req: request to parse and check for error conditions
391 *
392 * returns error code if one is discovered, otherwise returns 0
393 *
394 * this will have to be more complicated if we have multiple
395 * error packet types
396 */
397
398 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
399 {
400 int8_t type;
401 int err;
402
403 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
404 if (err) {
405 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
406 return err;
407 }
408
409 if (type == P9_RERROR) {
410 int ecode;
411 char *ename;
412
413 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
414 if (err) {
415 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
416 err);
417 return err;
418 }
419
420 if (c->dotu)
421 err = -ecode;
422
423 if (!err || !IS_ERR_VALUE(err))
424 err = p9_errstr2errno(ename, strlen(ename));
425
426 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
427
428 kfree(ename);
429 } else
430 err = 0;
431
432 return err;
433 }
434
435 /**
436 * p9_client_flush - flush (cancel) a request
437 * @c: client state
438 * @oldreq: request to cancel
439 *
440 * This sents a flush for a particular requests and links
441 * the flush request to the original request. The current
442 * code only supports a single flush request although the protocol
443 * allows for multiple flush requests to be sent for a single request.
444 *
445 */
446
447 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
448 {
449 struct p9_req_t *req;
450 int16_t oldtag;
451 int err;
452
453 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
454 if (err)
455 return err;
456
457 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
458
459 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
460 if (IS_ERR(req))
461 return PTR_ERR(req);
462
463
464 /* if we haven't received a response for oldreq,
465 remove it from the list. */
466 spin_lock(&c->lock);
467 if (oldreq->status == REQ_STATUS_FLSH)
468 list_del(&oldreq->req_list);
469 spin_unlock(&c->lock);
470
471 p9_free_req(c, req);
472 return 0;
473 }
474
475 /**
476 * p9_client_rpc - issue a request and wait for a response
477 * @c: client session
478 * @type: type of request
479 * @fmt: protocol format string (see protocol.c)
480 *
481 * Returns request structure (which client must free using p9_free_req)
482 */
483
484 static struct p9_req_t *
485 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
486 {
487 va_list ap;
488 int tag, err;
489 struct p9_req_t *req;
490 unsigned long flags;
491 int sigpending;
492
493 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
494
495 if (c->status != Connected)
496 return ERR_PTR(-EIO);
497
498 if (signal_pending(current)) {
499 sigpending = 1;
500 clear_thread_flag(TIF_SIGPENDING);
501 } else
502 sigpending = 0;
503
504 tag = P9_NOTAG;
505 if (type != P9_TVERSION) {
506 tag = p9_idpool_get(c->tagpool);
507 if (tag < 0)
508 return ERR_PTR(-ENOMEM);
509 }
510
511 req = p9_tag_alloc(c, tag);
512 if (IS_ERR(req))
513 return req;
514
515 /* marshall the data */
516 p9pdu_prepare(req->tc, tag, type);
517 va_start(ap, fmt);
518 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
519 va_end(ap);
520 p9pdu_finalize(req->tc);
521
522 err = c->trans_mod->request(c, req);
523 if (err < 0) {
524 c->status = Disconnected;
525 goto reterr;
526 }
527
528 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
529 err = wait_event_interruptible(*req->wq,
530 req->status >= REQ_STATUS_RCVD);
531 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
532 req->wq, tag, err);
533
534 if (req->status == REQ_STATUS_ERROR) {
535 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
536 err = req->t_err;
537 }
538
539 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
540 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
541 sigpending = 1;
542 clear_thread_flag(TIF_SIGPENDING);
543
544 if (c->trans_mod->cancel(c, req))
545 p9_client_flush(c, req);
546
547 /* if we received the response anyway, don't signal error */
548 if (req->status == REQ_STATUS_RCVD)
549 err = 0;
550 }
551
552 if (sigpending) {
553 spin_lock_irqsave(&current->sighand->siglock, flags);
554 recalc_sigpending();
555 spin_unlock_irqrestore(&current->sighand->siglock, flags);
556 }
557
558 if (err < 0)
559 goto reterr;
560
561 err = p9_check_errors(c, req);
562 if (!err) {
563 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
564 return req;
565 }
566
567 reterr:
568 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
569 err);
570 p9_free_req(c, req);
571 return ERR_PTR(err);
572 }
573
574 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
575 {
576 int ret;
577 struct p9_fid *fid;
578 unsigned long flags;
579
580 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
581 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
582 if (!fid)
583 return ERR_PTR(-ENOMEM);
584
585 ret = p9_idpool_get(clnt->fidpool);
586 if (ret < 0) {
587 ret = -ENOSPC;
588 goto error;
589 }
590 fid->fid = ret;
591
592 memset(&fid->qid, 0, sizeof(struct p9_qid));
593 fid->mode = -1;
594 fid->uid = current_fsuid();
595 fid->clnt = clnt;
596 fid->rdir = NULL;
597 spin_lock_irqsave(&clnt->lock, flags);
598 list_add(&fid->flist, &clnt->fidlist);
599 spin_unlock_irqrestore(&clnt->lock, flags);
600
601 return fid;
602
603 error:
604 kfree(fid);
605 return ERR_PTR(ret);
606 }
607
608 static void p9_fid_destroy(struct p9_fid *fid)
609 {
610 struct p9_client *clnt;
611 unsigned long flags;
612
613 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
614 clnt = fid->clnt;
615 p9_idpool_put(fid->fid, clnt->fidpool);
616 spin_lock_irqsave(&clnt->lock, flags);
617 list_del(&fid->flist);
618 spin_unlock_irqrestore(&clnt->lock, flags);
619 kfree(fid->rdir);
620 kfree(fid);
621 }
622
623 int p9_client_version(struct p9_client *c)
624 {
625 int err = 0;
626 struct p9_req_t *req;
627 char *version;
628 int msize;
629
630 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
631 c->msize, c->dotu);
632 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
633 c->dotu ? "9P2000.u" : "9P2000");
634 if (IS_ERR(req))
635 return PTR_ERR(req);
636
637 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
638 if (err) {
639 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
640 p9pdu_dump(1, req->rc);
641 goto error;
642 }
643
644 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
645 if (!memcmp(version, "9P2000.u", 8))
646 c->dotu = 1;
647 else if (!memcmp(version, "9P2000", 6))
648 c->dotu = 0;
649 else {
650 err = -EREMOTEIO;
651 goto error;
652 }
653
654 if (msize < c->msize)
655 c->msize = msize;
656
657 error:
658 kfree(version);
659 p9_free_req(c, req);
660
661 return err;
662 }
663 EXPORT_SYMBOL(p9_client_version);
664
665 struct p9_client *p9_client_create(const char *dev_name, char *options)
666 {
667 int err;
668 struct p9_client *clnt;
669
670 err = 0;
671 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
672 if (!clnt)
673 return ERR_PTR(-ENOMEM);
674
675 clnt->trans_mod = NULL;
676 clnt->trans = NULL;
677 spin_lock_init(&clnt->lock);
678 INIT_LIST_HEAD(&clnt->fidlist);
679
680 p9_tag_init(clnt);
681
682 err = parse_opts(options, clnt);
683 if (err < 0)
684 goto free_client;
685
686 if (!clnt->trans_mod)
687 clnt->trans_mod = v9fs_get_default_trans();
688
689 if (clnt->trans_mod == NULL) {
690 err = -EPROTONOSUPPORT;
691 P9_DPRINTK(P9_DEBUG_ERROR,
692 "No transport defined or default transport\n");
693 goto free_client;
694 }
695
696 clnt->fidpool = p9_idpool_create();
697 if (IS_ERR(clnt->fidpool)) {
698 err = PTR_ERR(clnt->fidpool);
699 clnt->fidpool = NULL;
700 goto put_trans;
701 }
702
703 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
704 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
705
706 err = clnt->trans_mod->create(clnt, dev_name, options);
707 if (err)
708 goto destroy_fidpool;
709
710 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
711 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
712
713 err = p9_client_version(clnt);
714 if (err)
715 goto close_trans;
716
717 return clnt;
718
719 close_trans:
720 clnt->trans_mod->close(clnt);
721 destroy_fidpool:
722 p9_idpool_destroy(clnt->fidpool);
723 put_trans:
724 v9fs_put_trans(clnt->trans_mod);
725 free_client:
726 kfree(clnt);
727 return ERR_PTR(err);
728 }
729 EXPORT_SYMBOL(p9_client_create);
730
731 void p9_client_destroy(struct p9_client *clnt)
732 {
733 struct p9_fid *fid, *fidptr;
734
735 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
736
737 if (clnt->trans_mod)
738 clnt->trans_mod->close(clnt);
739
740 v9fs_put_trans(clnt->trans_mod);
741
742 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
743 p9_fid_destroy(fid);
744
745 if (clnt->fidpool)
746 p9_idpool_destroy(clnt->fidpool);
747
748 p9_tag_cleanup(clnt);
749
750 kfree(clnt);
751 }
752 EXPORT_SYMBOL(p9_client_destroy);
753
754 void p9_client_disconnect(struct p9_client *clnt)
755 {
756 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
757 clnt->status = Disconnected;
758 }
759 EXPORT_SYMBOL(p9_client_disconnect);
760
761 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
762 char *uname, u32 n_uname, char *aname)
763 {
764 int err;
765 struct p9_req_t *req;
766 struct p9_fid *fid;
767 struct p9_qid qid;
768
769 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
770 afid ? afid->fid : -1, uname, aname);
771 err = 0;
772
773 fid = p9_fid_create(clnt);
774 if (IS_ERR(fid)) {
775 err = PTR_ERR(fid);
776 fid = NULL;
777 goto error;
778 }
779
780 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
781 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
782 if (IS_ERR(req)) {
783 err = PTR_ERR(req);
784 goto error;
785 }
786
787 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
788 if (err) {
789 p9pdu_dump(1, req->rc);
790 p9_free_req(clnt, req);
791 goto error;
792 }
793
794 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
795 qid.type,
796 (unsigned long long)qid.path,
797 qid.version);
798
799 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
800
801 p9_free_req(clnt, req);
802 return fid;
803
804 error:
805 if (fid)
806 p9_fid_destroy(fid);
807 return ERR_PTR(err);
808 }
809 EXPORT_SYMBOL(p9_client_attach);
810
811 struct p9_fid *
812 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
813 {
814 int err;
815 struct p9_req_t *req;
816 struct p9_qid qid;
817 struct p9_fid *afid;
818
819 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
820 err = 0;
821
822 afid = p9_fid_create(clnt);
823 if (IS_ERR(afid)) {
824 err = PTR_ERR(afid);
825 afid = NULL;
826 goto error;
827 }
828
829 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
830 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
831 if (IS_ERR(req)) {
832 err = PTR_ERR(req);
833 goto error;
834 }
835
836 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
837 if (err) {
838 p9pdu_dump(1, req->rc);
839 p9_free_req(clnt, req);
840 goto error;
841 }
842
843 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
844 qid.type,
845 (unsigned long long)qid.path,
846 qid.version);
847
848 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
849 p9_free_req(clnt, req);
850 return afid;
851
852 error:
853 if (afid)
854 p9_fid_destroy(afid);
855 return ERR_PTR(err);
856 }
857 EXPORT_SYMBOL(p9_client_auth);
858
859 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
860 int clone)
861 {
862 int err;
863 struct p9_client *clnt;
864 struct p9_fid *fid;
865 struct p9_qid *wqids;
866 struct p9_req_t *req;
867 int16_t nwqids, count;
868
869 err = 0;
870 clnt = oldfid->clnt;
871 if (clone) {
872 fid = p9_fid_create(clnt);
873 if (IS_ERR(fid)) {
874 err = PTR_ERR(fid);
875 fid = NULL;
876 goto error;
877 }
878
879 fid->uid = oldfid->uid;
880 } else
881 fid = oldfid;
882
883
884 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
885 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
886
887 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
888 nwname, wnames);
889 if (IS_ERR(req)) {
890 err = PTR_ERR(req);
891 goto error;
892 }
893
894 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
895 if (err) {
896 p9pdu_dump(1, req->rc);
897 p9_free_req(clnt, req);
898 goto clunk_fid;
899 }
900 p9_free_req(clnt, req);
901
902 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
903
904 if (nwqids != nwname) {
905 err = -ENOENT;
906 goto clunk_fid;
907 }
908
909 for (count = 0; count < nwqids; count++)
910 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
911 count, wqids[count].type,
912 (unsigned long long)wqids[count].path,
913 wqids[count].version);
914
915 if (nwname)
916 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
917 else
918 fid->qid = oldfid->qid;
919
920 return fid;
921
922 clunk_fid:
923 p9_client_clunk(fid);
924 fid = NULL;
925
926 error:
927 if (fid && (fid != oldfid))
928 p9_fid_destroy(fid);
929
930 return ERR_PTR(err);
931 }
932 EXPORT_SYMBOL(p9_client_walk);
933
934 int p9_client_open(struct p9_fid *fid, int mode)
935 {
936 int err;
937 struct p9_client *clnt;
938 struct p9_req_t *req;
939 struct p9_qid qid;
940 int iounit;
941
942 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
943 err = 0;
944 clnt = fid->clnt;
945
946 if (fid->mode != -1)
947 return -EINVAL;
948
949 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
950 if (IS_ERR(req)) {
951 err = PTR_ERR(req);
952 goto error;
953 }
954
955 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
956 if (err) {
957 p9pdu_dump(1, req->rc);
958 goto free_and_error;
959 }
960
961 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
962 qid.type,
963 (unsigned long long)qid.path,
964 qid.version, iounit);
965
966 fid->mode = mode;
967 fid->iounit = iounit;
968
969 free_and_error:
970 p9_free_req(clnt, req);
971 error:
972 return err;
973 }
974 EXPORT_SYMBOL(p9_client_open);
975
976 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
977 char *extension)
978 {
979 int err;
980 struct p9_client *clnt;
981 struct p9_req_t *req;
982 struct p9_qid qid;
983 int iounit;
984
985 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
986 fid->fid, name, perm, mode);
987 err = 0;
988 clnt = fid->clnt;
989
990 if (fid->mode != -1)
991 return -EINVAL;
992
993 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
994 mode, extension);
995 if (IS_ERR(req)) {
996 err = PTR_ERR(req);
997 goto error;
998 }
999
1000 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
1001 if (err) {
1002 p9pdu_dump(1, req->rc);
1003 goto free_and_error;
1004 }
1005
1006 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1007 qid.type,
1008 (unsigned long long)qid.path,
1009 qid.version, iounit);
1010
1011 fid->mode = mode;
1012 fid->iounit = iounit;
1013
1014 free_and_error:
1015 p9_free_req(clnt, req);
1016 error:
1017 return err;
1018 }
1019 EXPORT_SYMBOL(p9_client_fcreate);
1020
1021 int p9_client_clunk(struct p9_fid *fid)
1022 {
1023 int err;
1024 struct p9_client *clnt;
1025 struct p9_req_t *req;
1026
1027 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1028 err = 0;
1029 clnt = fid->clnt;
1030
1031 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1032 if (IS_ERR(req)) {
1033 err = PTR_ERR(req);
1034 goto error;
1035 }
1036
1037 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1038
1039 p9_free_req(clnt, req);
1040 p9_fid_destroy(fid);
1041
1042 error:
1043 return err;
1044 }
1045 EXPORT_SYMBOL(p9_client_clunk);
1046
1047 int p9_client_remove(struct p9_fid *fid)
1048 {
1049 int err;
1050 struct p9_client *clnt;
1051 struct p9_req_t *req;
1052
1053 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1054 err = 0;
1055 clnt = fid->clnt;
1056
1057 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1058 if (IS_ERR(req)) {
1059 err = PTR_ERR(req);
1060 goto error;
1061 }
1062
1063 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1064
1065 p9_free_req(clnt, req);
1066 p9_fid_destroy(fid);
1067
1068 error:
1069 return err;
1070 }
1071 EXPORT_SYMBOL(p9_client_remove);
1072
1073 int
1074 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1075 u32 count)
1076 {
1077 int err, rsize, total;
1078 struct p9_client *clnt;
1079 struct p9_req_t *req;
1080 char *dataptr;
1081
1082 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1083 (long long unsigned) offset, count);
1084 err = 0;
1085 clnt = fid->clnt;
1086 total = 0;
1087
1088 rsize = fid->iounit;
1089 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1090 rsize = clnt->msize - P9_IOHDRSZ;
1091
1092 if (count < rsize)
1093 rsize = count;
1094
1095 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1096 if (IS_ERR(req)) {
1097 err = PTR_ERR(req);
1098 goto error;
1099 }
1100
1101 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1102 if (err) {
1103 p9pdu_dump(1, req->rc);
1104 goto free_and_error;
1105 }
1106
1107 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1108
1109 if (data) {
1110 memmove(data, dataptr, count);
1111 }
1112
1113 if (udata) {
1114 err = copy_to_user(udata, dataptr, count);
1115 if (err) {
1116 err = -EFAULT;
1117 goto free_and_error;
1118 }
1119 }
1120
1121 p9_free_req(clnt, req);
1122 return count;
1123
1124 free_and_error:
1125 p9_free_req(clnt, req);
1126 error:
1127 return err;
1128 }
1129 EXPORT_SYMBOL(p9_client_read);
1130
1131 int
1132 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1133 u64 offset, u32 count)
1134 {
1135 int err, rsize, total;
1136 struct p9_client *clnt;
1137 struct p9_req_t *req;
1138
1139 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1140 fid->fid, (long long unsigned) offset, count);
1141 err = 0;
1142 clnt = fid->clnt;
1143 total = 0;
1144
1145 rsize = fid->iounit;
1146 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1147 rsize = clnt->msize - P9_IOHDRSZ;
1148
1149 if (count < rsize)
1150 rsize = count;
1151 if (data)
1152 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1153 rsize, data);
1154 else
1155 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1156 rsize, udata);
1157 if (IS_ERR(req)) {
1158 err = PTR_ERR(req);
1159 goto error;
1160 }
1161
1162 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1163 if (err) {
1164 p9pdu_dump(1, req->rc);
1165 goto free_and_error;
1166 }
1167
1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1169
1170 p9_free_req(clnt, req);
1171 return count;
1172
1173 free_and_error:
1174 p9_free_req(clnt, req);
1175 error:
1176 return err;
1177 }
1178 EXPORT_SYMBOL(p9_client_write);
1179
1180 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1181 {
1182 int err;
1183 struct p9_client *clnt;
1184 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1185 struct p9_req_t *req;
1186 u16 ignored;
1187
1188 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1189
1190 if (!ret)
1191 return ERR_PTR(-ENOMEM);
1192
1193 err = 0;
1194 clnt = fid->clnt;
1195
1196 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1197 if (IS_ERR(req)) {
1198 err = PTR_ERR(req);
1199 goto error;
1200 }
1201
1202 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1203 if (err) {
1204 p9pdu_dump(1, req->rc);
1205 p9_free_req(clnt, req);
1206 goto error;
1207 }
1208
1209 P9_DPRINTK(P9_DEBUG_9P,
1210 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1211 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1212 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1213 "<<< uid=%d gid=%d n_muid=%d\n",
1214 ret->size, ret->type, ret->dev, ret->qid.type,
1215 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1216 ret->atime, ret->mtime, (unsigned long long)ret->length,
1217 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1218 ret->n_uid, ret->n_gid, ret->n_muid);
1219
1220 p9_free_req(clnt, req);
1221 return ret;
1222
1223 error:
1224 kfree(ret);
1225 return ERR_PTR(err);
1226 }
1227 EXPORT_SYMBOL(p9_client_stat);
1228
1229 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1230 {
1231 int ret;
1232
1233 /* NOTE: size shouldn't include its own length */
1234 /* size[2] type[2] dev[4] qid[13] */
1235 /* mode[4] atime[4] mtime[4] length[8]*/
1236 /* name[s] uid[s] gid[s] muid[s] */
1237 ret = 2+4+13+4+4+4+8+2+2+2+2;
1238
1239 if (wst->name)
1240 ret += strlen(wst->name);
1241 if (wst->uid)
1242 ret += strlen(wst->uid);
1243 if (wst->gid)
1244 ret += strlen(wst->gid);
1245 if (wst->muid)
1246 ret += strlen(wst->muid);
1247
1248 if (optional) {
1249 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1250 if (wst->extension)
1251 ret += strlen(wst->extension);
1252 }
1253
1254 return ret;
1255 }
1256
1257 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1258 {
1259 int err;
1260 struct p9_req_t *req;
1261 struct p9_client *clnt;
1262
1263 err = 0;
1264 clnt = fid->clnt;
1265 wst->size = p9_client_statsize(wst, clnt->dotu);
1266 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1267 P9_DPRINTK(P9_DEBUG_9P,
1268 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1269 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1270 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1271 " uid=%d gid=%d n_muid=%d\n",
1272 wst->size, wst->type, wst->dev, wst->qid.type,
1273 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1274 wst->atime, wst->mtime, (unsigned long long)wst->length,
1275 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1276 wst->n_uid, wst->n_gid, wst->n_muid);
1277
1278 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1279 if (IS_ERR(req)) {
1280 err = PTR_ERR(req);
1281 goto error;
1282 }
1283
1284 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1285
1286 p9_free_req(clnt, req);
1287 error:
1288 return err;
1289 }
1290 EXPORT_SYMBOL(p9_client_wstat);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree