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ping reqs
[cor_2_6_31.git] / net / 9p / client.c
blob787ccddb85ea6cd8c53550deef5a11e3336a4ee1
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 * v9fs_parse_options - parse mount options into session structure
64 * @options: options string passed from mount
65 * @v9ses: existing v9fs session 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 BUG_ON(tag >= c->max_tag);
225
226 row = tag / P9_ROW_MAXTAG;
227 col = tag % P9_ROW_MAXTAG;
228
229 return &c->reqs[row][col];
230 }
231 EXPORT_SYMBOL(p9_tag_lookup);
232
233 /**
234 * p9_tag_init - setup tags structure and contents
235 * @tags: tags structure from the client struct
236 *
237 * This initializes the tags structure for each client instance.
238 *
239 */
240
241 static int p9_tag_init(struct p9_client *c)
242 {
243 int err = 0;
244
245 c->tagpool = p9_idpool_create();
246 if (IS_ERR(c->tagpool)) {
247 err = PTR_ERR(c->tagpool);
248 c->tagpool = NULL;
249 goto error;
250 }
251
252 p9_idpool_get(c->tagpool); /* reserve tag 0 */
253
254 c->max_tag = 0;
255 error:
256 return err;
257 }
258
259 /**
260 * p9_tag_cleanup - cleans up tags structure and reclaims resources
261 * @tags: tags structure from the client struct
262 *
263 * This frees resources associated with the tags structure
264 *
265 */
266 static void p9_tag_cleanup(struct p9_client *c)
267 {
268 int row, col;
269
270 /* check to insure all requests are idle */
271 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
272 for (col = 0; col < P9_ROW_MAXTAG; col++) {
273 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
274 P9_DPRINTK(P9_DEBUG_MUX,
275 "Attempting to cleanup non-free tag %d,%d\n",
276 row, col);
277 /* TODO: delay execution of cleanup */
278 return;
279 }
280 }
281 }
282
283 if (c->tagpool)
284 p9_idpool_destroy(c->tagpool);
285
286 /* free requests associated with tags */
287 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
288 for (col = 0; col < P9_ROW_MAXTAG; col++) {
289 kfree(c->reqs[row][col].wq);
290 kfree(c->reqs[row][col].tc);
291 kfree(c->reqs[row][col].rc);
292 }
293 kfree(c->reqs[row]);
294 }
295 c->max_tag = 0;
296 }
297
298 /**
299 * p9_free_req - free a request and clean-up as necessary
300 * c: client state
301 * r: request to release
302 *
303 */
304
305 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
306 {
307 int tag = r->tc->tag;
308 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
309
310 r->status = REQ_STATUS_IDLE;
311 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
312 p9_idpool_put(tag, c->tagpool);
313 }
314
315 /**
316 * p9_client_cb - call back from transport to client
317 * c: client state
318 * req: request received
319 *
320 */
321 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
322 {
323 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
324 wake_up(req->wq);
325 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
326 }
327 EXPORT_SYMBOL(p9_client_cb);
328
329 /**
330 * p9_parse_header - parse header arguments out of a packet
331 * @pdu: packet to parse
332 * @size: size of packet
333 * @type: type of request
334 * @tag: tag of packet
335 * @rewind: set if we need to rewind offset afterwards
336 */
337
338 int
339 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
340 int rewind)
341 {
342 int8_t r_type;
343 int16_t r_tag;
344 int32_t r_size;
345 int offset = pdu->offset;
346 int err;
347
348 pdu->offset = 0;
349 if (pdu->size == 0)
350 pdu->size = 7;
351
352 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
353 if (err)
354 goto rewind_and_exit;
355
356 pdu->size = r_size;
357 pdu->id = r_type;
358 pdu->tag = r_tag;
359
360 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
361 pdu->id, pdu->tag);
362
363 if (type)
364 *type = r_type;
365 if (tag)
366 *tag = r_tag;
367 if (size)
368 *size = r_size;
369
370
371 rewind_and_exit:
372 if (rewind)
373 pdu->offset = offset;
374 return err;
375 }
376 EXPORT_SYMBOL(p9_parse_header);
377
378 /**
379 * p9_check_errors - check 9p packet for error return and process it
380 * @c: current client instance
381 * @req: request to parse and check for error conditions
382 *
383 * returns error code if one is discovered, otherwise returns 0
384 *
385 * this will have to be more complicated if we have multiple
386 * error packet types
387 */
388
389 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
390 {
391 int8_t type;
392 int err;
393
394 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
395 if (err) {
396 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
397 return err;
398 }
399
400 if (type == P9_RERROR) {
401 int ecode;
402 char *ename;
403
404 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
405 if (err) {
406 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
407 err);
408 return err;
409 }
410
411 if (c->dotu)
412 err = -ecode;
413
414 if (!err) {
415 err = p9_errstr2errno(ename, strlen(ename));
416
417 /* string match failed */
418 if (!err)
419 err = -ESERVERFAULT;
420 }
421
422 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
423
424 kfree(ename);
425 } else
426 err = 0;
427
428 return err;
429 }
430
431 /**
432 * p9_client_flush - flush (cancel) a request
433 * c: client state
434 * req: request to cancel
435 *
436 * This sents a flush for a particular requests and links
437 * the flush request to the original request. The current
438 * code only supports a single flush request although the protocol
439 * allows for multiple flush requests to be sent for a single request.
440 *
441 */
442
443 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
444 {
445 struct p9_req_t *req;
446 int16_t oldtag;
447 int err;
448
449 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
450 if (err)
451 return err;
452
453 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
454
455 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
456 if (IS_ERR(req))
457 return PTR_ERR(req);
458
459
460 /* if we haven't received a response for oldreq,
461 remove it from the list. */
462 spin_lock(&c->lock);
463 if (oldreq->status == REQ_STATUS_FLSH)
464 list_del(&oldreq->req_list);
465 spin_unlock(&c->lock);
466
467 p9_free_req(c, req);
468 return 0;
469 }
470
471 /**
472 * p9_client_rpc - issue a request and wait for a response
473 * @c: client session
474 * @type: type of request
475 * @fmt: protocol format string (see protocol.c)
476 *
477 * Returns request structure (which client must free using p9_free_req)
478 */
479
480 static struct p9_req_t *
481 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
482 {
483 va_list ap;
484 int tag, err;
485 struct p9_req_t *req;
486 unsigned long flags;
487 int sigpending;
488
489 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
490
491 if (c->status != Connected)
492 return ERR_PTR(-EIO);
493
494 if (signal_pending(current)) {
495 sigpending = 1;
496 clear_thread_flag(TIF_SIGPENDING);
497 } else
498 sigpending = 0;
499
500 tag = P9_NOTAG;
501 if (type != P9_TVERSION) {
502 tag = p9_idpool_get(c->tagpool);
503 if (tag < 0)
504 return ERR_PTR(-ENOMEM);
505 }
506
507 req = p9_tag_alloc(c, tag);
508 if (IS_ERR(req))
509 return req;
510
511 /* marshall the data */
512 p9pdu_prepare(req->tc, tag, type);
513 va_start(ap, fmt);
514 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
515 va_end(ap);
516 p9pdu_finalize(req->tc);
517
518 err = c->trans_mod->request(c, req);
519 if (err < 0) {
520 c->status = Disconnected;
521 goto reterr;
522 }
523
524 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
525 err = wait_event_interruptible(*req->wq,
526 req->status >= REQ_STATUS_RCVD);
527 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
528 req->wq, tag, err);
529
530 if (req->status == REQ_STATUS_ERROR) {
531 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
532 err = req->t_err;
533 }
534
535 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
536 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
537 sigpending = 1;
538 clear_thread_flag(TIF_SIGPENDING);
539
540 if (c->trans_mod->cancel(c, req))
541 p9_client_flush(c, req);
542
543 /* if we received the response anyway, don't signal error */
544 if (req->status == REQ_STATUS_RCVD)
545 err = 0;
546 }
547
548 if (sigpending) {
549 spin_lock_irqsave(&current->sighand->siglock, flags);
550 recalc_sigpending();
551 spin_unlock_irqrestore(&current->sighand->siglock, flags);
552 }
553
554 if (err < 0)
555 goto reterr;
556
557 err = p9_check_errors(c, req);
558 if (!err) {
559 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
560 return req;
561 }
562
563 reterr:
564 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
565 err);
566 p9_free_req(c, req);
567 return ERR_PTR(err);
568 }
569
570 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
571 {
572 int ret;
573 struct p9_fid *fid;
574 unsigned long flags;
575
576 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
577 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
578 if (!fid)
579 return ERR_PTR(-ENOMEM);
580
581 ret = p9_idpool_get(clnt->fidpool);
582 if (ret < 0) {
583 ret = -ENOSPC;
584 goto error;
585 }
586 fid->fid = ret;
587
588 memset(&fid->qid, 0, sizeof(struct p9_qid));
589 fid->mode = -1;
590 fid->rdir_fpos = 0;
591 fid->uid = current_fsuid();
592 fid->clnt = clnt;
593 fid->aux = NULL;
594
595 spin_lock_irqsave(&clnt->lock, flags);
596 list_add(&fid->flist, &clnt->fidlist);
597 spin_unlock_irqrestore(&clnt->lock, flags);
598
599 return fid;
600
601 error:
602 kfree(fid);
603 return ERR_PTR(ret);
604 }
605
606 static void p9_fid_destroy(struct p9_fid *fid)
607 {
608 struct p9_client *clnt;
609 unsigned long flags;
610
611 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
612 clnt = fid->clnt;
613 p9_idpool_put(fid->fid, clnt->fidpool);
614 spin_lock_irqsave(&clnt->lock, flags);
615 list_del(&fid->flist);
616 spin_unlock_irqrestore(&clnt->lock, flags);
617 kfree(fid);
618 }
619
620 int p9_client_version(struct p9_client *c)
621 {
622 int err = 0;
623 struct p9_req_t *req;
624 char *version;
625 int msize;
626
627 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
628 c->msize, c->dotu);
629 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
630 c->dotu ? "9P2000.u" : "9P2000");
631 if (IS_ERR(req))
632 return PTR_ERR(req);
633
634 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
635 if (err) {
636 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
637 p9pdu_dump(1, req->rc);
638 goto error;
639 }
640
641 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
642 if (!memcmp(version, "9P2000.u", 8))
643 c->dotu = 1;
644 else if (!memcmp(version, "9P2000", 6))
645 c->dotu = 0;
646 else {
647 err = -EREMOTEIO;
648 goto error;
649 }
650
651 if (msize < c->msize)
652 c->msize = msize;
653
654 error:
655 kfree(version);
656 p9_free_req(c, req);
657
658 return err;
659 }
660 EXPORT_SYMBOL(p9_client_version);
661
662 struct p9_client *p9_client_create(const char *dev_name, char *options)
663 {
664 int err;
665 struct p9_client *clnt;
666
667 err = 0;
668 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
669 if (!clnt)
670 return ERR_PTR(-ENOMEM);
671
672 clnt->trans_mod = NULL;
673 clnt->trans = NULL;
674 spin_lock_init(&clnt->lock);
675 INIT_LIST_HEAD(&clnt->fidlist);
676 clnt->fidpool = p9_idpool_create();
677 if (IS_ERR(clnt->fidpool)) {
678 err = PTR_ERR(clnt->fidpool);
679 clnt->fidpool = NULL;
680 goto error;
681 }
682
683 p9_tag_init(clnt);
684
685 err = parse_opts(options, clnt);
686 if (err < 0)
687 goto error;
688
689 if (!clnt->trans_mod)
690 clnt->trans_mod = v9fs_get_default_trans();
691
692 if (clnt->trans_mod == NULL) {
693 err = -EPROTONOSUPPORT;
694 P9_DPRINTK(P9_DEBUG_ERROR,
695 "No transport defined or default transport\n");
696 goto error;
697 }
698
699 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
700 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
701
702 err = clnt->trans_mod->create(clnt, dev_name, options);
703 if (err)
704 goto error;
705
706 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
707 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
708
709 err = p9_client_version(clnt);
710 if (err)
711 goto error;
712
713 return clnt;
714
715 error:
716 p9_client_destroy(clnt);
717 return ERR_PTR(err);
718 }
719 EXPORT_SYMBOL(p9_client_create);
720
721 void p9_client_destroy(struct p9_client *clnt)
722 {
723 struct p9_fid *fid, *fidptr;
724
725 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
726
727 if (clnt->trans_mod)
728 clnt->trans_mod->close(clnt);
729
730 v9fs_put_trans(clnt->trans_mod);
731
732 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
733 p9_fid_destroy(fid);
734
735 if (clnt->fidpool)
736 p9_idpool_destroy(clnt->fidpool);
737
738 p9_tag_cleanup(clnt);
739
740 kfree(clnt);
741 }
742 EXPORT_SYMBOL(p9_client_destroy);
743
744 void p9_client_disconnect(struct p9_client *clnt)
745 {
746 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
747 clnt->status = Disconnected;
748 }
749 EXPORT_SYMBOL(p9_client_disconnect);
750
751 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
752 char *uname, u32 n_uname, char *aname)
753 {
754 int err;
755 struct p9_req_t *req;
756 struct p9_fid *fid;
757 struct p9_qid qid;
758
759 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
760 afid ? afid->fid : -1, uname, aname);
761 err = 0;
762
763 fid = p9_fid_create(clnt);
764 if (IS_ERR(fid)) {
765 err = PTR_ERR(fid);
766 fid = NULL;
767 goto error;
768 }
769
770 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
771 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
772 if (IS_ERR(req)) {
773 err = PTR_ERR(req);
774 goto error;
775 }
776
777 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
778 if (err) {
779 p9pdu_dump(1, req->rc);
780 p9_free_req(clnt, req);
781 goto error;
782 }
783
784 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
785 qid.type,
786 (unsigned long long)qid.path,
787 qid.version);
788
789 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
790
791 p9_free_req(clnt, req);
792 return fid;
793
794 error:
795 if (fid)
796 p9_fid_destroy(fid);
797 return ERR_PTR(err);
798 }
799 EXPORT_SYMBOL(p9_client_attach);
800
801 struct p9_fid *
802 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
803 {
804 int err;
805 struct p9_req_t *req;
806 struct p9_qid qid;
807 struct p9_fid *afid;
808
809 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
810 err = 0;
811
812 afid = p9_fid_create(clnt);
813 if (IS_ERR(afid)) {
814 err = PTR_ERR(afid);
815 afid = NULL;
816 goto error;
817 }
818
819 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
820 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
821 if (IS_ERR(req)) {
822 err = PTR_ERR(req);
823 goto error;
824 }
825
826 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
827 if (err) {
828 p9pdu_dump(1, req->rc);
829 p9_free_req(clnt, req);
830 goto error;
831 }
832
833 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
834 qid.type,
835 (unsigned long long)qid.path,
836 qid.version);
837
838 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
839 p9_free_req(clnt, req);
840 return afid;
841
842 error:
843 if (afid)
844 p9_fid_destroy(afid);
845 return ERR_PTR(err);
846 }
847 EXPORT_SYMBOL(p9_client_auth);
848
849 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
850 int clone)
851 {
852 int err;
853 struct p9_client *clnt;
854 struct p9_fid *fid;
855 struct p9_qid *wqids;
856 struct p9_req_t *req;
857 int16_t nwqids, count;
858
859 err = 0;
860 clnt = oldfid->clnt;
861 if (clone) {
862 fid = p9_fid_create(clnt);
863 if (IS_ERR(fid)) {
864 err = PTR_ERR(fid);
865 fid = NULL;
866 goto error;
867 }
868
869 fid->uid = oldfid->uid;
870 } else
871 fid = oldfid;
872
873
874 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
875 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
876
877 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
878 nwname, wnames);
879 if (IS_ERR(req)) {
880 err = PTR_ERR(req);
881 goto error;
882 }
883
884 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
885 if (err) {
886 p9pdu_dump(1, req->rc);
887 p9_free_req(clnt, req);
888 goto clunk_fid;
889 }
890 p9_free_req(clnt, req);
891
892 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
893
894 if (nwqids != nwname) {
895 err = -ENOENT;
896 goto clunk_fid;
897 }
898
899 for (count = 0; count < nwqids; count++)
900 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
901 count, wqids[count].type,
902 (unsigned long long)wqids[count].path,
903 wqids[count].version);
904
905 if (nwname)
906 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
907 else
908 fid->qid = oldfid->qid;
909
910 return fid;
911
912 clunk_fid:
913 p9_client_clunk(fid);
914 fid = NULL;
915
916 error:
917 if (fid && (fid != oldfid))
918 p9_fid_destroy(fid);
919
920 return ERR_PTR(err);
921 }
922 EXPORT_SYMBOL(p9_client_walk);
923
924 int p9_client_open(struct p9_fid *fid, int mode)
925 {
926 int err;
927 struct p9_client *clnt;
928 struct p9_req_t *req;
929 struct p9_qid qid;
930 int iounit;
931
932 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
933 err = 0;
934 clnt = fid->clnt;
935
936 if (fid->mode != -1)
937 return -EINVAL;
938
939 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
940 if (IS_ERR(req)) {
941 err = PTR_ERR(req);
942 goto error;
943 }
944
945 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
946 if (err) {
947 p9pdu_dump(1, req->rc);
948 goto free_and_error;
949 }
950
951 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
952 qid.type,
953 (unsigned long long)qid.path,
954 qid.version, iounit);
955
956 fid->mode = mode;
957 fid->iounit = iounit;
958
959 free_and_error:
960 p9_free_req(clnt, req);
961 error:
962 return err;
963 }
964 EXPORT_SYMBOL(p9_client_open);
965
966 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
967 char *extension)
968 {
969 int err;
970 struct p9_client *clnt;
971 struct p9_req_t *req;
972 struct p9_qid qid;
973 int iounit;
974
975 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
976 fid->fid, name, perm, mode);
977 err = 0;
978 clnt = fid->clnt;
979
980 if (fid->mode != -1)
981 return -EINVAL;
982
983 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
984 mode, extension);
985 if (IS_ERR(req)) {
986 err = PTR_ERR(req);
987 goto error;
988 }
989
990 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
991 if (err) {
992 p9pdu_dump(1, req->rc);
993 goto free_and_error;
994 }
995
996 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
997 qid.type,
998 (unsigned long long)qid.path,
999 qid.version, iounit);
1000
1001 fid->mode = mode;
1002 fid->iounit = iounit;
1003
1004 free_and_error:
1005 p9_free_req(clnt, req);
1006 error:
1007 return err;
1008 }
1009 EXPORT_SYMBOL(p9_client_fcreate);
1010
1011 int p9_client_clunk(struct p9_fid *fid)
1012 {
1013 int err;
1014 struct p9_client *clnt;
1015 struct p9_req_t *req;
1016
1017 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1018 err = 0;
1019 clnt = fid->clnt;
1020
1021 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1022 if (IS_ERR(req)) {
1023 err = PTR_ERR(req);
1024 goto error;
1025 }
1026
1027 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1028
1029 p9_free_req(clnt, req);
1030 p9_fid_destroy(fid);
1031
1032 error:
1033 return err;
1034 }
1035 EXPORT_SYMBOL(p9_client_clunk);
1036
1037 int p9_client_remove(struct p9_fid *fid)
1038 {
1039 int err;
1040 struct p9_client *clnt;
1041 struct p9_req_t *req;
1042
1043 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1044 err = 0;
1045 clnt = fid->clnt;
1046
1047 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1048 if (IS_ERR(req)) {
1049 err = PTR_ERR(req);
1050 goto error;
1051 }
1052
1053 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1054
1055 p9_free_req(clnt, req);
1056 p9_fid_destroy(fid);
1057
1058 error:
1059 return err;
1060 }
1061 EXPORT_SYMBOL(p9_client_remove);
1062
1063 int
1064 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1065 u32 count)
1066 {
1067 int err, rsize, total;
1068 struct p9_client *clnt;
1069 struct p9_req_t *req;
1070 char *dataptr;
1071
1072 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1073 (long long unsigned) offset, count);
1074 err = 0;
1075 clnt = fid->clnt;
1076 total = 0;
1077
1078 rsize = fid->iounit;
1079 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1080 rsize = clnt->msize - P9_IOHDRSZ;
1081
1082 if (count < rsize)
1083 rsize = count;
1084
1085 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1086 if (IS_ERR(req)) {
1087 err = PTR_ERR(req);
1088 goto error;
1089 }
1090
1091 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1092 if (err) {
1093 p9pdu_dump(1, req->rc);
1094 goto free_and_error;
1095 }
1096
1097 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1098
1099 if (data) {
1100 memmove(data, dataptr, count);
1101 }
1102
1103 if (udata) {
1104 err = copy_to_user(udata, dataptr, count);
1105 if (err) {
1106 err = -EFAULT;
1107 goto free_and_error;
1108 }
1109 }
1110
1111 p9_free_req(clnt, req);
1112 return count;
1113
1114 free_and_error:
1115 p9_free_req(clnt, req);
1116 error:
1117 return err;
1118 }
1119 EXPORT_SYMBOL(p9_client_read);
1120
1121 int
1122 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1123 u64 offset, u32 count)
1124 {
1125 int err, rsize, total;
1126 struct p9_client *clnt;
1127 struct p9_req_t *req;
1128
1129 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1130 fid->fid, (long long unsigned) offset, count);
1131 err = 0;
1132 clnt = fid->clnt;
1133 total = 0;
1134
1135 rsize = fid->iounit;
1136 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1137 rsize = clnt->msize - P9_IOHDRSZ;
1138
1139 if (count < rsize)
1140 rsize = count;
1141 if (data)
1142 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1143 rsize, data);
1144 else
1145 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1146 rsize, udata);
1147 if (IS_ERR(req)) {
1148 err = PTR_ERR(req);
1149 goto error;
1150 }
1151
1152 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1153 if (err) {
1154 p9pdu_dump(1, req->rc);
1155 goto free_and_error;
1156 }
1157
1158 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1159
1160 p9_free_req(clnt, req);
1161 return count;
1162
1163 free_and_error:
1164 p9_free_req(clnt, req);
1165 error:
1166 return err;
1167 }
1168 EXPORT_SYMBOL(p9_client_write);
1169
1170 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1171 {
1172 int err;
1173 struct p9_client *clnt;
1174 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1175 struct p9_req_t *req;
1176 u16 ignored;
1177
1178 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1179
1180 if (!ret)
1181 return ERR_PTR(-ENOMEM);
1182
1183 err = 0;
1184 clnt = fid->clnt;
1185
1186 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1187 if (IS_ERR(req)) {
1188 err = PTR_ERR(req);
1189 goto error;
1190 }
1191
1192 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1193 if (err) {
1194 p9pdu_dump(1, req->rc);
1195 p9_free_req(clnt, req);
1196 goto error;
1197 }
1198
1199 P9_DPRINTK(P9_DEBUG_9P,
1200 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1201 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1202 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1203 "<<< uid=%d gid=%d n_muid=%d\n",
1204 ret->size, ret->type, ret->dev, ret->qid.type,
1205 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1206 ret->atime, ret->mtime, (unsigned long long)ret->length,
1207 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1208 ret->n_uid, ret->n_gid, ret->n_muid);
1209
1210 p9_free_req(clnt, req);
1211 return ret;
1212
1213 error:
1214 kfree(ret);
1215 return ERR_PTR(err);
1216 }
1217 EXPORT_SYMBOL(p9_client_stat);
1218
1219 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1220 {
1221 int ret;
1222
1223 /* size[2] type[2] dev[4] qid[13] */
1224 /* mode[4] atime[4] mtime[4] length[8]*/
1225 /* name[s] uid[s] gid[s] muid[s] */
1226 ret = 2+2+4+13+4+4+4+8+2+2+2+2;
1227
1228 if (wst->name)
1229 ret += strlen(wst->name);
1230 if (wst->uid)
1231 ret += strlen(wst->uid);
1232 if (wst->gid)
1233 ret += strlen(wst->gid);
1234 if (wst->muid)
1235 ret += strlen(wst->muid);
1236
1237 if (optional) {
1238 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1239 if (wst->extension)
1240 ret += strlen(wst->extension);
1241 }
1242
1243 return ret;
1244 }
1245
1246 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1247 {
1248 int err;
1249 struct p9_req_t *req;
1250 struct p9_client *clnt;
1251
1252 err = 0;
1253 clnt = fid->clnt;
1254 wst->size = p9_client_statsize(wst, clnt->dotu);
1255 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1256 P9_DPRINTK(P9_DEBUG_9P,
1257 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1258 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1259 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1260 " uid=%d gid=%d n_muid=%d\n",
1261 wst->size, wst->type, wst->dev, wst->qid.type,
1262 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1263 wst->atime, wst->mtime, (unsigned long long)wst->length,
1264 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1265 wst->n_uid, wst->n_gid, wst->n_muid);
1266
1267 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
1268 if (IS_ERR(req)) {
1269 err = PTR_ERR(req);
1270 goto error;
1271 }
1272
1273 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1274
1275 p9_free_req(clnt, req);
1276 error:
1277 return err;
1278 }
1279 EXPORT_SYMBOL(p9_client_wstat);
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