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Merge branch 'topic/div64-cleanup' into for-linus
[linux-2.6/verdex.git] / net / 9p / client.c
blobdd43a8289b0d9ecaf74aadc205063d2e2eaf8b3a
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 if (!clnt->trans_mod)
121 clnt->trans_mod = v9fs_get_default_trans();
122
123 kfree(options);
124 return ret;
125 }
126
127 /**
128 * p9_tag_alloc - lookup/allocate a request by tag
129 * @c: client session to lookup tag within
130 * @tag: numeric id for transaction
131 *
132 * this is a simple array lookup, but will grow the
133 * request_slots as necessary to accomodate transaction
134 * ids which did not previously have a slot.
135 *
136 * this code relies on the client spinlock to manage locks, its
137 * possible we should switch to something else, but I'd rather
138 * stick with something low-overhead for the common case.
139 *
140 */
141
142 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
143 {
144 unsigned long flags;
145 int row, col;
146 struct p9_req_t *req;
147
148 /* This looks up the original request by tag so we know which
149 * buffer to read the data into */
150 tag++;
151
152 if (tag >= c->max_tag) {
153 spin_lock_irqsave(&c->lock, flags);
154 /* check again since original check was outside of lock */
155 while (tag >= c->max_tag) {
156 row = (tag / P9_ROW_MAXTAG);
157 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
158 sizeof(struct p9_req_t), GFP_ATOMIC);
159
160 if (!c->reqs[row]) {
161 printk(KERN_ERR "Couldn't grow tag array\n");
162 spin_unlock_irqrestore(&c->lock, flags);
163 return ERR_PTR(-ENOMEM);
164 }
165 for (col = 0; col < P9_ROW_MAXTAG; col++) {
166 c->reqs[row][col].status = REQ_STATUS_IDLE;
167 c->reqs[row][col].tc = NULL;
168 }
169 c->max_tag += P9_ROW_MAXTAG;
170 }
171 spin_unlock_irqrestore(&c->lock, flags);
172 }
173 row = tag / P9_ROW_MAXTAG;
174 col = tag % P9_ROW_MAXTAG;
175
176 req = &c->reqs[row][col];
177 if (!req->tc) {
178 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
179 if (!req->wq) {
180 printk(KERN_ERR "Couldn't grow tag array\n");
181 return ERR_PTR(-ENOMEM);
182 }
183 init_waitqueue_head(req->wq);
184 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
185 GFP_KERNEL);
186 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
187 GFP_KERNEL);
188 if ((!req->tc) || (!req->rc)) {
189 printk(KERN_ERR "Couldn't grow tag array\n");
190 kfree(req->tc);
191 kfree(req->rc);
192 kfree(req->wq);
193 req->tc = req->rc = NULL;
194 req->wq = NULL;
195 return ERR_PTR(-ENOMEM);
196 }
197 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
198 req->tc->capacity = c->msize;
199 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
200 req->rc->capacity = c->msize;
201 }
202
203 p9pdu_reset(req->tc);
204 p9pdu_reset(req->rc);
205
206 req->tc->tag = tag-1;
207 req->status = REQ_STATUS_ALLOC;
208
209 return &c->reqs[row][col];
210 }
211
212 /**
213 * p9_tag_lookup - lookup a request by tag
214 * @c: client session to lookup tag within
215 * @tag: numeric id for transaction
216 *
217 */
218
219 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
220 {
221 int row, col;
222
223 /* This looks up the original request by tag so we know which
224 * buffer to read the data into */
225 tag++;
226
227 BUG_ON(tag >= c->max_tag);
228
229 row = tag / P9_ROW_MAXTAG;
230 col = tag % P9_ROW_MAXTAG;
231
232 return &c->reqs[row][col];
233 }
234 EXPORT_SYMBOL(p9_tag_lookup);
235
236 /**
237 * p9_tag_init - setup tags structure and contents
238 * @tags: tags structure from the client struct
239 *
240 * This initializes the tags structure for each client instance.
241 *
242 */
243
244 static int p9_tag_init(struct p9_client *c)
245 {
246 int err = 0;
247
248 c->tagpool = p9_idpool_create();
249 if (IS_ERR(c->tagpool)) {
250 err = PTR_ERR(c->tagpool);
251 c->tagpool = NULL;
252 goto error;
253 }
254
255 p9_idpool_get(c->tagpool); /* reserve tag 0 */
256
257 c->max_tag = 0;
258 error:
259 return err;
260 }
261
262 /**
263 * p9_tag_cleanup - cleans up tags structure and reclaims resources
264 * @tags: tags structure from the client struct
265 *
266 * This frees resources associated with the tags structure
267 *
268 */
269 static void p9_tag_cleanup(struct p9_client *c)
270 {
271 int row, col;
272
273 /* check to insure all requests are idle */
274 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
275 for (col = 0; col < P9_ROW_MAXTAG; col++) {
276 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
277 P9_DPRINTK(P9_DEBUG_MUX,
278 "Attempting to cleanup non-free tag %d,%d\n",
279 row, col);
280 /* TODO: delay execution of cleanup */
281 return;
282 }
283 }
284 }
285
286 if (c->tagpool)
287 p9_idpool_destroy(c->tagpool);
288
289 /* free requests associated with tags */
290 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
291 for (col = 0; col < P9_ROW_MAXTAG; col++) {
292 kfree(c->reqs[row][col].wq);
293 kfree(c->reqs[row][col].tc);
294 kfree(c->reqs[row][col].rc);
295 }
296 kfree(c->reqs[row]);
297 }
298 c->max_tag = 0;
299 }
300
301 /**
302 * p9_free_req - free a request and clean-up as necessary
303 * c: client state
304 * r: request to release
305 *
306 */
307
308 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
309 {
310 int tag = r->tc->tag;
311 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
312
313 r->status = REQ_STATUS_IDLE;
314 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
315 p9_idpool_put(tag, c->tagpool);
316 }
317
318 /**
319 * p9_client_cb - call back from transport to client
320 * c: client state
321 * req: request received
322 *
323 */
324 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
325 {
326 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
327 wake_up(req->wq);
328 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
329 }
330 EXPORT_SYMBOL(p9_client_cb);
331
332 /**
333 * p9_parse_header - parse header arguments out of a packet
334 * @pdu: packet to parse
335 * @size: size of packet
336 * @type: type of request
337 * @tag: tag of packet
338 * @rewind: set if we need to rewind offset afterwards
339 */
340
341 int
342 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
343 int rewind)
344 {
345 int8_t r_type;
346 int16_t r_tag;
347 int32_t r_size;
348 int offset = pdu->offset;
349 int err;
350
351 pdu->offset = 0;
352 if (pdu->size == 0)
353 pdu->size = 7;
354
355 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
356 if (err)
357 goto rewind_and_exit;
358
359 pdu->size = r_size;
360 pdu->id = r_type;
361 pdu->tag = r_tag;
362
363 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
364 pdu->id, pdu->tag);
365
366 if (type)
367 *type = r_type;
368 if (tag)
369 *tag = r_tag;
370 if (size)
371 *size = r_size;
372
373
374 rewind_and_exit:
375 if (rewind)
376 pdu->offset = offset;
377 return err;
378 }
379 EXPORT_SYMBOL(p9_parse_header);
380
381 /**
382 * p9_check_errors - check 9p packet for error return and process it
383 * @c: current client instance
384 * @req: request to parse and check for error conditions
385 *
386 * returns error code if one is discovered, otherwise returns 0
387 *
388 * this will have to be more complicated if we have multiple
389 * error packet types
390 */
391
392 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
393 {
394 int8_t type;
395 int err;
396
397 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
398 if (err) {
399 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
400 return err;
401 }
402
403 if (type == P9_RERROR) {
404 int ecode;
405 char *ename;
406
407 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
408 if (err) {
409 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
410 err);
411 return err;
412 }
413
414 if (c->dotu)
415 err = -ecode;
416
417 if (!err) {
418 err = p9_errstr2errno(ename, strlen(ename));
419
420 /* string match failed */
421 if (!err)
422 err = -ESERVERFAULT;
423 }
424
425 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
426
427 kfree(ename);
428 } else
429 err = 0;
430
431 return err;
432 }
433
434 /**
435 * p9_client_flush - flush (cancel) a request
436 * c: client state
437 * req: request to cancel
438 *
439 * This sents a flush for a particular requests and links
440 * the flush request to the original request. The current
441 * code only supports a single flush request although the protocol
442 * allows for multiple flush requests to be sent for a single request.
443 *
444 */
445
446 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
447 {
448 struct p9_req_t *req;
449 int16_t oldtag;
450 int err;
451
452 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
453 if (err)
454 return err;
455
456 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
457
458 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
459 if (IS_ERR(req))
460 return PTR_ERR(req);
461
462
463 /* if we haven't received a response for oldreq,
464 remove it from the list. */
465 spin_lock(&c->lock);
466 if (oldreq->status == REQ_STATUS_FLSH)
467 list_del(&oldreq->req_list);
468 spin_unlock(&c->lock);
469
470 p9_free_req(c, req);
471 return 0;
472 }
473
474 /**
475 * p9_client_rpc - issue a request and wait for a response
476 * @c: client session
477 * @type: type of request
478 * @fmt: protocol format string (see protocol.c)
479 *
480 * Returns request structure (which client must free using p9_free_req)
481 */
482
483 static struct p9_req_t *
484 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
485 {
486 va_list ap;
487 int tag, err;
488 struct p9_req_t *req;
489 unsigned long flags;
490 int sigpending;
491
492 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
493
494 if (c->status != Connected)
495 return ERR_PTR(-EIO);
496
497 if (signal_pending(current)) {
498 sigpending = 1;
499 clear_thread_flag(TIF_SIGPENDING);
500 } else
501 sigpending = 0;
502
503 tag = P9_NOTAG;
504 if (type != P9_TVERSION) {
505 tag = p9_idpool_get(c->tagpool);
506 if (tag < 0)
507 return ERR_PTR(-ENOMEM);
508 }
509
510 req = p9_tag_alloc(c, tag);
511 if (IS_ERR(req))
512 return req;
513
514 /* marshall the data */
515 p9pdu_prepare(req->tc, tag, type);
516 va_start(ap, fmt);
517 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
518 va_end(ap);
519 p9pdu_finalize(req->tc);
520
521 err = c->trans_mod->request(c, req);
522 if (err < 0) {
523 c->status = Disconnected;
524 goto reterr;
525 }
526
527 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
528 err = wait_event_interruptible(*req->wq,
529 req->status >= REQ_STATUS_RCVD);
530 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
531 req->wq, tag, err);
532
533 if (req->status == REQ_STATUS_ERROR) {
534 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
535 err = req->t_err;
536 }
537
538 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
539 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
540 sigpending = 1;
541 clear_thread_flag(TIF_SIGPENDING);
542
543 if (c->trans_mod->cancel(c, req))
544 p9_client_flush(c, req);
545
546 /* if we received the response anyway, don't signal error */
547 if (req->status == REQ_STATUS_RCVD)
548 err = 0;
549 }
550
551 if (sigpending) {
552 spin_lock_irqsave(&current->sighand->siglock, flags);
553 recalc_sigpending();
554 spin_unlock_irqrestore(&current->sighand->siglock, flags);
555 }
556
557 if (err < 0)
558 goto reterr;
559
560 err = p9_check_errors(c, req);
561 if (!err) {
562 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
563 return req;
564 }
565
566 reterr:
567 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
568 err);
569 p9_free_req(c, req);
570 return ERR_PTR(err);
571 }
572
573 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
574 {
575 int ret;
576 struct p9_fid *fid;
577 unsigned long flags;
578
579 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
580 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
581 if (!fid)
582 return ERR_PTR(-ENOMEM);
583
584 ret = p9_idpool_get(clnt->fidpool);
585 if (ret < 0) {
586 ret = -ENOSPC;
587 goto error;
588 }
589 fid->fid = ret;
590
591 memset(&fid->qid, 0, sizeof(struct p9_qid));
592 fid->mode = -1;
593 fid->rdir_fpos = 0;
594 fid->uid = current_fsuid();
595 fid->clnt = clnt;
596 fid->aux = NULL;
597
598 spin_lock_irqsave(&clnt->lock, flags);
599 list_add(&fid->flist, &clnt->fidlist);
600 spin_unlock_irqrestore(&clnt->lock, flags);
601
602 return fid;
603
604 error:
605 kfree(fid);
606 return ERR_PTR(ret);
607 }
608
609 static void p9_fid_destroy(struct p9_fid *fid)
610 {
611 struct p9_client *clnt;
612 unsigned long flags;
613
614 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
615 clnt = fid->clnt;
616 p9_idpool_put(fid->fid, clnt->fidpool);
617 spin_lock_irqsave(&clnt->lock, flags);
618 list_del(&fid->flist);
619 spin_unlock_irqrestore(&clnt->lock, flags);
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 clnt->fidpool = p9_idpool_create();
680 if (IS_ERR(clnt->fidpool)) {
681 err = PTR_ERR(clnt->fidpool);
682 clnt->fidpool = NULL;
683 goto error;
684 }
685
686 p9_tag_init(clnt);
687
688 err = parse_opts(options, clnt);
689 if (err < 0)
690 goto error;
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 data += count;
1102 }
1103
1104 if (udata) {
1105 err = copy_to_user(udata, dataptr, count);
1106 if (err) {
1107 err = -EFAULT;
1108 goto free_and_error;
1109 }
1110 }
1111
1112 p9_free_req(clnt, req);
1113 return count;
1114
1115 free_and_error:
1116 p9_free_req(clnt, req);
1117 error:
1118 return err;
1119 }
1120 EXPORT_SYMBOL(p9_client_read);
1121
1122 int
1123 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1124 u64 offset, u32 count)
1125 {
1126 int err, rsize, total;
1127 struct p9_client *clnt;
1128 struct p9_req_t *req;
1129
1130 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1131 fid->fid, (long long unsigned) offset, count);
1132 err = 0;
1133 clnt = fid->clnt;
1134 total = 0;
1135
1136 rsize = fid->iounit;
1137 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1138 rsize = clnt->msize - P9_IOHDRSZ;
1139
1140 if (count < rsize)
1141 rsize = count;
1142 if (data)
1143 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1144 rsize, data);
1145 else
1146 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1147 rsize, udata);
1148 if (IS_ERR(req)) {
1149 err = PTR_ERR(req);
1150 goto error;
1151 }
1152
1153 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1154 if (err) {
1155 p9pdu_dump(1, req->rc);
1156 goto free_and_error;
1157 }
1158
1159 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1160
1161 p9_free_req(clnt, req);
1162 return count;
1163
1164 free_and_error:
1165 p9_free_req(clnt, req);
1166 error:
1167 return err;
1168 }
1169 EXPORT_SYMBOL(p9_client_write);
1170
1171 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1172 {
1173 int err;
1174 struct p9_client *clnt;
1175 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1176 struct p9_req_t *req;
1177 u16 ignored;
1178
1179 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1180
1181 if (!ret)
1182 return ERR_PTR(-ENOMEM);
1183
1184 err = 0;
1185 clnt = fid->clnt;
1186
1187 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1188 if (IS_ERR(req)) {
1189 err = PTR_ERR(req);
1190 goto error;
1191 }
1192
1193 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1194 if (err) {
1195 ret = ERR_PTR(err);
1196 p9pdu_dump(1, req->rc);
1197 goto free_and_error;
1198 }
1199
1200 P9_DPRINTK(P9_DEBUG_9P,
1201 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1202 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1203 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1204 "<<< uid=%d gid=%d n_muid=%d\n",
1205 ret->size, ret->type, ret->dev, ret->qid.type,
1206 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1207 ret->atime, ret->mtime, (unsigned long long)ret->length,
1208 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1209 ret->n_uid, ret->n_gid, ret->n_muid);
1210
1211 p9_free_req(clnt, req);
1212 return ret;
1213
1214 free_and_error:
1215 p9_free_req(clnt, req);
1216 error:
1217 kfree(ret);
1218 return ERR_PTR(err);
1219 }
1220 EXPORT_SYMBOL(p9_client_stat);
1221
1222 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1223 {
1224 int ret;
1225
1226 /* size[2] type[2] dev[4] qid[13] */
1227 /* mode[4] atime[4] mtime[4] length[8]*/
1228 /* name[s] uid[s] gid[s] muid[s] */
1229 ret = 2+2+4+13+4+4+4+8+2+2+2+2;
1230
1231 if (wst->name)
1232 ret += strlen(wst->name);
1233 if (wst->uid)
1234 ret += strlen(wst->uid);
1235 if (wst->gid)
1236 ret += strlen(wst->gid);
1237 if (wst->muid)
1238 ret += strlen(wst->muid);
1239
1240 if (optional) {
1241 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1242 if (wst->extension)
1243 ret += strlen(wst->extension);
1244 }
1245
1246 return ret;
1247 }
1248
1249 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1250 {
1251 int err;
1252 struct p9_req_t *req;
1253 struct p9_client *clnt;
1254
1255 err = 0;
1256 clnt = fid->clnt;
1257 wst->size = p9_client_statsize(wst, clnt->dotu);
1258 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1259 P9_DPRINTK(P9_DEBUG_9P,
1260 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1261 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1262 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1263 " uid=%d gid=%d n_muid=%d\n",
1264 wst->size, wst->type, wst->dev, wst->qid.type,
1265 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1266 wst->atime, wst->mtime, (unsigned long long)wst->length,
1267 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1268 wst->n_uid, wst->n_gid, wst->n_muid);
1269
1270 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
1271 if (IS_ERR(req)) {
1272 err = PTR_ERR(req);
1273 goto error;
1274 }
1275
1276 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1277
1278 p9_free_req(clnt, req);
1279 error:
1280 return err;
1281 }
1282 EXPORT_SYMBOL(p9_client_wstat);
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